* [PATCH 1/5] Bluetooth: Add Copyright notice to L2CAP @ 2010-07-13 14:57 Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 2/5] Bluetooth: update L2CAP version Gustavo F. Padovan 2010-07-13 17:11 ` [PATCH 1/5] Bluetooth: Add Copyright notice to L2CAP Marcel Holtmann 0 siblings, 2 replies; 9+ messages in thread From: Gustavo F. Padovan @ 2010-07-13 14:57 UTC (permalink / raw) To: linux-bluetooth; +Cc: marcel, Gustavo F. Padovan From: Gustavo F. Padovan <padovan@profusion.mobi> Copyright for the time I worked on L2CAP during the Google Summer of Code program. Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> --- include/net/bluetooth/l2cap.h | 1 + net/bluetooth/l2cap.c | 1 + 2 files changed, 2 insertions(+), 0 deletions(-) diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h index 7df70e4..d030302 100644 --- a/include/net/bluetooth/l2cap.h +++ b/include/net/bluetooth/l2cap.h @@ -1,6 +1,7 @@ /* BlueZ - Bluetooth protocol stack for Linux Copyright (C) 2000-2001 Qualcomm Incorporated + Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c index 449cbdd..67a6f59 100644 --- a/net/bluetooth/l2cap.c +++ b/net/bluetooth/l2cap.c @@ -1,6 +1,7 @@ /* BlueZ - Bluetooth protocol stack for Linux Copyright (C) 2000-2001 Qualcomm Incorporated + Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> -- 1.7.1 ^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH 2/5] Bluetooth: update L2CAP version 2010-07-13 14:57 [PATCH 1/5] Bluetooth: Add Copyright notice to L2CAP Gustavo F. Padovan @ 2010-07-13 14:57 ` Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 3/5] Bluetooth: create a l2cap dir Gustavo F. Padovan 2010-07-13 17:12 ` [PATCH 2/5] Bluetooth: update L2CAP version Marcel Holtmann 2010-07-13 17:11 ` [PATCH 1/5] Bluetooth: Add Copyright notice to L2CAP Marcel Holtmann 1 sibling, 2 replies; 9+ messages in thread From: Gustavo F. Padovan @ 2010-07-13 14:57 UTC (permalink / raw) To: linux-bluetooth; +Cc: marcel, Gustavo F. Padovan From: Gustavo F. Padovan <padovan@profusion.mobi> We did some changes on the L2CAP configuration process and its behaviour is bit different now. That justifies a updated on the L2CAP version. Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> --- net/bluetooth/l2cap.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c index 67a6f59..cdd608d 100644 --- a/net/bluetooth/l2cap.c +++ b/net/bluetooth/l2cap.c @@ -54,7 +54,7 @@ #include <net/bluetooth/hci_core.h> #include <net/bluetooth/l2cap.h> -#define VERSION "2.14" +#define VERSION "2.15" static int enable_ertm = 0; -- 1.7.1 ^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH 3/5] Bluetooth: create a l2cap dir 2010-07-13 14:57 ` [PATCH 2/5] Bluetooth: update L2CAP version Gustavo F. Padovan @ 2010-07-13 14:57 ` Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 4/5] Bluetooth: Prepare l2cap for split Gustavo F. Padovan 2010-07-13 17:13 ` [PATCH 3/5] Bluetooth: create a l2cap dir Marcel Holtmann 2010-07-13 17:12 ` [PATCH 2/5] Bluetooth: update L2CAP version Marcel Holtmann 1 sibling, 2 replies; 9+ messages in thread From: Gustavo F. Padovan @ 2010-07-13 14:57 UTC (permalink / raw) To: linux-bluetooth; +Cc: marcel, Gustavo F. Padovan From: Gustavo F. Padovan <padovan@profusion.mobi> The dir is being created looking forward to the l2cap.c split. Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> --- net/bluetooth/Makefile | 2 +- net/bluetooth/l2cap.c | 4859 ------------------------------------------ net/bluetooth/l2cap/Makefile | 5 + net/bluetooth/l2cap/l2cap.c | 4859 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 4865 insertions(+), 4860 deletions(-) delete mode 100644 net/bluetooth/l2cap.c create mode 100644 net/bluetooth/l2cap/Makefile create mode 100644 net/bluetooth/l2cap/l2cap.c diff --git a/net/bluetooth/Makefile b/net/bluetooth/Makefile index d1e433f..e4a200a 100644 --- a/net/bluetooth/Makefile +++ b/net/bluetooth/Makefile @@ -3,8 +3,8 @@ # obj-$(CONFIG_BT) += bluetooth.o -obj-$(CONFIG_BT_L2CAP) += l2cap.o obj-$(CONFIG_BT_SCO) += sco.o +obj-$(CONFIG_BT_L2CAP) += l2cap/ obj-$(CONFIG_BT_RFCOMM) += rfcomm/ obj-$(CONFIG_BT_BNEP) += bnep/ obj-$(CONFIG_BT_CMTP) += cmtp/ diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c deleted file mode 100644 index cdd608d..0000000 --- a/net/bluetooth/l2cap.c +++ /dev/null @@ -1,4859 +0,0 @@ -/* - BlueZ - Bluetooth protocol stack for Linux - Copyright (C) 2000-2001 Qualcomm Incorporated - Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> - - Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License version 2 as - published by the Free Software Foundation; - - THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS - OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. - IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY - CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES - WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - - ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, - COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS - SOFTWARE IS DISCLAIMED. -*/ - -/* Bluetooth L2CAP core and sockets. */ - -#include <linux/module.h> - -#include <linux/types.h> -#include <linux/capability.h> -#include <linux/errno.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/slab.h> -#include <linux/poll.h> -#include <linux/fcntl.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/socket.h> -#include <linux/skbuff.h> -#include <linux/list.h> -#include <linux/device.h> -#include <linux/debugfs.h> -#include <linux/seq_file.h> -#include <linux/uaccess.h> -#include <linux/crc16.h> -#include <net/sock.h> - -#include <asm/system.h> -#include <asm/unaligned.h> - -#include <net/bluetooth/bluetooth.h> -#include <net/bluetooth/hci_core.h> -#include <net/bluetooth/l2cap.h> - -#define VERSION "2.15" - -static int enable_ertm = 0; - -static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; -static u8 l2cap_fixed_chan[8] = { 0x02, }; - -static const struct proto_ops l2cap_sock_ops; - -static struct workqueue_struct *_busy_wq; - -static struct bt_sock_list l2cap_sk_list = { - .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) -}; - -static void l2cap_busy_work(struct work_struct *work); - -static void __l2cap_sock_close(struct sock *sk, int reason); -static void l2cap_sock_close(struct sock *sk); -static void l2cap_sock_kill(struct sock *sk); - -static int l2cap_build_conf_req(struct sock *sk, void *data); -static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, - u8 code, u8 ident, u16 dlen, void *data); - -static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); - -/* ---- L2CAP timers ---- */ -static void l2cap_sock_timeout(unsigned long arg) -{ - struct sock *sk = (struct sock *) arg; - int reason; - - BT_DBG("sock %p state %d", sk, sk->sk_state); - - bh_lock_sock(sk); - - if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) - reason = ECONNREFUSED; - else if (sk->sk_state == BT_CONNECT && - l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) - reason = ECONNREFUSED; - else - reason = ETIMEDOUT; - - __l2cap_sock_close(sk, reason); - - bh_unlock_sock(sk); - - l2cap_sock_kill(sk); - sock_put(sk); -} - -static void l2cap_sock_set_timer(struct sock *sk, long timeout) -{ - BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); - sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); -} - -static void l2cap_sock_clear_timer(struct sock *sk) -{ - BT_DBG("sock %p state %d", sk, sk->sk_state); - sk_stop_timer(sk, &sk->sk_timer); -} - -/* ---- L2CAP channels ---- */ -static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) -{ - struct sock *s; - for (s = l->head; s; s = l2cap_pi(s)->next_c) { - if (l2cap_pi(s)->dcid == cid) - break; - } - return s; -} - -static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) -{ - struct sock *s; - for (s = l->head; s; s = l2cap_pi(s)->next_c) { - if (l2cap_pi(s)->scid == cid) - break; - } - return s; -} - -/* Find channel with given SCID. - * Returns locked socket */ -static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) -{ - struct sock *s; - read_lock(&l->lock); - s = __l2cap_get_chan_by_scid(l, cid); - if (s) - bh_lock_sock(s); - read_unlock(&l->lock); - return s; -} - -static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) -{ - struct sock *s; - for (s = l->head; s; s = l2cap_pi(s)->next_c) { - if (l2cap_pi(s)->ident == ident) - break; - } - return s; -} - -static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) -{ - struct sock *s; - read_lock(&l->lock); - s = __l2cap_get_chan_by_ident(l, ident); - if (s) - bh_lock_sock(s); - read_unlock(&l->lock); - return s; -} - -static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) -{ - u16 cid = L2CAP_CID_DYN_START; - - for (; cid < L2CAP_CID_DYN_END; cid++) { - if (!__l2cap_get_chan_by_scid(l, cid)) - return cid; - } - - return 0; -} - -static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) -{ - sock_hold(sk); - - if (l->head) - l2cap_pi(l->head)->prev_c = sk; - - l2cap_pi(sk)->next_c = l->head; - l2cap_pi(sk)->prev_c = NULL; - l->head = sk; -} - -static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) -{ - struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; - - write_lock_bh(&l->lock); - if (sk == l->head) - l->head = next; - - if (next) - l2cap_pi(next)->prev_c = prev; - if (prev) - l2cap_pi(prev)->next_c = next; - write_unlock_bh(&l->lock); - - __sock_put(sk); -} - -static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) -{ - struct l2cap_chan_list *l = &conn->chan_list; - - BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, - l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); - - conn->disc_reason = 0x13; - - l2cap_pi(sk)->conn = conn; - - if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { - /* Alloc CID for connection-oriented socket */ - l2cap_pi(sk)->scid = l2cap_alloc_cid(l); - } else if (sk->sk_type == SOCK_DGRAM) { - /* Connectionless socket */ - l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; - l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; - l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; - } else { - /* Raw socket can send/recv signalling messages only */ - l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; - l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; - l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; - } - - __l2cap_chan_link(l, sk); - - if (parent) - bt_accept_enqueue(parent, sk); -} - -/* Delete channel. - * Must be called on the locked socket. */ -static void l2cap_chan_del(struct sock *sk, int err) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct sock *parent = bt_sk(sk)->parent; - - l2cap_sock_clear_timer(sk); - - BT_DBG("sk %p, conn %p, err %d", sk, conn, err); - - if (conn) { - /* Unlink from channel list */ - l2cap_chan_unlink(&conn->chan_list, sk); - l2cap_pi(sk)->conn = NULL; - hci_conn_put(conn->hcon); - } - - sk->sk_state = BT_CLOSED; - sock_set_flag(sk, SOCK_ZAPPED); - - if (err) - sk->sk_err = err; - - if (parent) { - bt_accept_unlink(sk); - parent->sk_data_ready(parent, 0); - } else - sk->sk_state_change(sk); - - skb_queue_purge(TX_QUEUE(sk)); - - if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { - struct srej_list *l, *tmp; - - del_timer(&l2cap_pi(sk)->retrans_timer); - del_timer(&l2cap_pi(sk)->monitor_timer); - del_timer(&l2cap_pi(sk)->ack_timer); - - skb_queue_purge(SREJ_QUEUE(sk)); - skb_queue_purge(BUSY_QUEUE(sk)); - - list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { - list_del(&l->list); - kfree(l); - } - } -} - -/* Service level security */ -static inline int l2cap_check_security(struct sock *sk) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - __u8 auth_type; - - if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { - if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) - auth_type = HCI_AT_NO_BONDING_MITM; - else - auth_type = HCI_AT_NO_BONDING; - - if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) - l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; - } else { - switch (l2cap_pi(sk)->sec_level) { - case BT_SECURITY_HIGH: - auth_type = HCI_AT_GENERAL_BONDING_MITM; - break; - case BT_SECURITY_MEDIUM: - auth_type = HCI_AT_GENERAL_BONDING; - break; - default: - auth_type = HCI_AT_NO_BONDING; - break; - } - } - - return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, - auth_type); -} - -static inline u8 l2cap_get_ident(struct l2cap_conn *conn) -{ - u8 id; - - /* Get next available identificator. - * 1 - 128 are used by kernel. - * 129 - 199 are reserved. - * 200 - 254 are used by utilities like l2ping, etc. - */ - - spin_lock_bh(&conn->lock); - - if (++conn->tx_ident > 128) - conn->tx_ident = 1; - - id = conn->tx_ident; - - spin_unlock_bh(&conn->lock); - - return id; -} - -static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) -{ - struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); - - BT_DBG("code 0x%2.2x", code); - - if (!skb) - return; - - hci_send_acl(conn->hcon, skb, 0); -} - -static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) -{ - struct sk_buff *skb; - struct l2cap_hdr *lh; - struct l2cap_conn *conn = pi->conn; - struct sock *sk = (struct sock *)pi; - int count, hlen = L2CAP_HDR_SIZE + 2; - - if (sk->sk_state != BT_CONNECTED) - return; - - if (pi->fcs == L2CAP_FCS_CRC16) - hlen += 2; - - BT_DBG("pi %p, control 0x%2.2x", pi, control); - - count = min_t(unsigned int, conn->mtu, hlen); - control |= L2CAP_CTRL_FRAME_TYPE; - - if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { - control |= L2CAP_CTRL_FINAL; - pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; - } - - if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { - control |= L2CAP_CTRL_POLL; - pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; - } - - skb = bt_skb_alloc(count, GFP_ATOMIC); - if (!skb) - return; - - lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); - lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); - lh->cid = cpu_to_le16(pi->dcid); - put_unaligned_le16(control, skb_put(skb, 2)); - - if (pi->fcs == L2CAP_FCS_CRC16) { - u16 fcs = crc16(0, (u8 *)lh, count - 2); - put_unaligned_le16(fcs, skb_put(skb, 2)); - } - - hci_send_acl(pi->conn->hcon, skb, 0); -} - -static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) -{ - if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { - control |= L2CAP_SUPER_RCV_NOT_READY; - pi->conn_state |= L2CAP_CONN_RNR_SENT; - } else - control |= L2CAP_SUPER_RCV_READY; - - control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; - - l2cap_send_sframe(pi, control); -} - -static inline int __l2cap_no_conn_pending(struct sock *sk) -{ - return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); -} - -static void l2cap_do_start(struct sock *sk) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - - if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { - if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) - return; - - if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { - struct l2cap_conn_req req; - req.scid = cpu_to_le16(l2cap_pi(sk)->scid); - req.psm = l2cap_pi(sk)->psm; - - l2cap_pi(sk)->ident = l2cap_get_ident(conn); - l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; - - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_REQ, sizeof(req), &req); - } - } else { - struct l2cap_info_req req; - req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); - - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; - conn->info_ident = l2cap_get_ident(conn); - - mod_timer(&conn->info_timer, jiffies + - msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); - - l2cap_send_cmd(conn, conn->info_ident, - L2CAP_INFO_REQ, sizeof(req), &req); - } -} - -static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) -{ - u32 local_feat_mask = l2cap_feat_mask; - if (enable_ertm) - local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; - - switch (mode) { - case L2CAP_MODE_ERTM: - return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; - case L2CAP_MODE_STREAMING: - return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; - default: - return 0x00; - } -} - -static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) -{ - struct l2cap_disconn_req req; - - if (!conn) - return; - - skb_queue_purge(TX_QUEUE(sk)); - - if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { - del_timer(&l2cap_pi(sk)->retrans_timer); - del_timer(&l2cap_pi(sk)->monitor_timer); - del_timer(&l2cap_pi(sk)->ack_timer); - } - - req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); - req.scid = cpu_to_le16(l2cap_pi(sk)->scid); - l2cap_send_cmd(conn, l2cap_get_ident(conn), - L2CAP_DISCONN_REQ, sizeof(req), &req); - - sk->sk_state = BT_DISCONN; - sk->sk_err = err; -} - -/* ---- L2CAP connections ---- */ -static void l2cap_conn_start(struct l2cap_conn *conn) -{ - struct l2cap_chan_list *l = &conn->chan_list; - struct sock_del_list del, *tmp1, *tmp2; - struct sock *sk; - - BT_DBG("conn %p", conn); - - INIT_LIST_HEAD(&del.list); - - read_lock(&l->lock); - - for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - bh_lock_sock(sk); - - if (sk->sk_type != SOCK_SEQPACKET && - sk->sk_type != SOCK_STREAM) { - bh_unlock_sock(sk); - continue; - } - - if (sk->sk_state == BT_CONNECT) { - struct l2cap_conn_req req; - - if (!l2cap_check_security(sk) || - !__l2cap_no_conn_pending(sk)) { - bh_unlock_sock(sk); - continue; - } - - if (!l2cap_mode_supported(l2cap_pi(sk)->mode, - conn->feat_mask) - && l2cap_pi(sk)->conf_state & - L2CAP_CONF_STATE2_DEVICE) { - tmp1 = kzalloc(sizeof(struct sock_del_list), - GFP_ATOMIC); - tmp1->sk = sk; - list_add_tail(&tmp1->list, &del.list); - bh_unlock_sock(sk); - continue; - } - - req.scid = cpu_to_le16(l2cap_pi(sk)->scid); - req.psm = l2cap_pi(sk)->psm; - - l2cap_pi(sk)->ident = l2cap_get_ident(conn); - l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; - - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_REQ, sizeof(req), &req); - - } else if (sk->sk_state == BT_CONNECT2) { - struct l2cap_conn_rsp rsp; - char buf[128]; - rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); - rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); - - if (l2cap_check_security(sk)) { - if (bt_sk(sk)->defer_setup) { - struct sock *parent = bt_sk(sk)->parent; - rsp.result = cpu_to_le16(L2CAP_CR_PEND); - rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); - parent->sk_data_ready(parent, 0); - - } else { - sk->sk_state = BT_CONFIG; - rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); - rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); - } - } else { - rsp.result = cpu_to_le16(L2CAP_CR_PEND); - rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); - } - - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_RSP, sizeof(rsp), &rsp); - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || - rsp.result != L2CAP_CR_SUCCESS) { - bh_unlock_sock(sk); - continue; - } - - l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(sk, buf), buf); - l2cap_pi(sk)->num_conf_req++; - } - - bh_unlock_sock(sk); - } - - read_unlock(&l->lock); - - list_for_each_entry_safe(tmp1, tmp2, &del.list, list) { - bh_lock_sock(tmp1->sk); - __l2cap_sock_close(tmp1->sk, ECONNRESET); - bh_unlock_sock(tmp1->sk); - list_del(&tmp1->list); - kfree(tmp1); - } -} - -static void l2cap_conn_ready(struct l2cap_conn *conn) -{ - struct l2cap_chan_list *l = &conn->chan_list; - struct sock *sk; - - BT_DBG("conn %p", conn); - - read_lock(&l->lock); - - for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - bh_lock_sock(sk); - - if (sk->sk_type != SOCK_SEQPACKET && - sk->sk_type != SOCK_STREAM) { - l2cap_sock_clear_timer(sk); - sk->sk_state = BT_CONNECTED; - sk->sk_state_change(sk); - } else if (sk->sk_state == BT_CONNECT) - l2cap_do_start(sk); - - bh_unlock_sock(sk); - } - - read_unlock(&l->lock); -} - -/* Notify sockets that we cannot guaranty reliability anymore */ -static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) -{ - struct l2cap_chan_list *l = &conn->chan_list; - struct sock *sk; - - BT_DBG("conn %p", conn); - - read_lock(&l->lock); - - for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - if (l2cap_pi(sk)->force_reliable) - sk->sk_err = err; - } - - read_unlock(&l->lock); -} - -static void l2cap_info_timeout(unsigned long arg) -{ - struct l2cap_conn *conn = (void *) arg; - - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; - conn->info_ident = 0; - - l2cap_conn_start(conn); -} - -static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - - if (conn || status) - return conn; - - conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); - if (!conn) - return NULL; - - hcon->l2cap_data = conn; - conn->hcon = hcon; - - BT_DBG("hcon %p conn %p", hcon, conn); - - conn->mtu = hcon->hdev->acl_mtu; - conn->src = &hcon->hdev->bdaddr; - conn->dst = &hcon->dst; - - conn->feat_mask = 0; - - spin_lock_init(&conn->lock); - rwlock_init(&conn->chan_list.lock); - - setup_timer(&conn->info_timer, l2cap_info_timeout, - (unsigned long) conn); - - conn->disc_reason = 0x13; - - return conn; -} - -static void l2cap_conn_del(struct hci_conn *hcon, int err) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - struct sock *sk; - - if (!conn) - return; - - BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); - - kfree_skb(conn->rx_skb); - - /* Kill channels */ - while ((sk = conn->chan_list.head)) { - bh_lock_sock(sk); - l2cap_chan_del(sk, err); - bh_unlock_sock(sk); - l2cap_sock_kill(sk); - } - - if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) - del_timer_sync(&conn->info_timer); - - hcon->l2cap_data = NULL; - kfree(conn); -} - -static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) -{ - struct l2cap_chan_list *l = &conn->chan_list; - write_lock_bh(&l->lock); - __l2cap_chan_add(conn, sk, parent); - write_unlock_bh(&l->lock); -} - -/* ---- Socket interface ---- */ -static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) -{ - struct sock *sk; - struct hlist_node *node; - sk_for_each(sk, node, &l2cap_sk_list.head) - if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) - goto found; - sk = NULL; -found: - return sk; -} - -/* Find socket with psm and source bdaddr. - * Returns closest match. - */ -static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) -{ - struct sock *sk = NULL, *sk1 = NULL; - struct hlist_node *node; - - sk_for_each(sk, node, &l2cap_sk_list.head) { - if (state && sk->sk_state != state) - continue; - - if (l2cap_pi(sk)->psm == psm) { - /* Exact match. */ - if (!bacmp(&bt_sk(sk)->src, src)) - break; - - /* Closest match */ - if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) - sk1 = sk; - } - } - return node ? sk : sk1; -} - -/* Find socket with given address (psm, src). - * Returns locked socket */ -static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) -{ - struct sock *s; - read_lock(&l2cap_sk_list.lock); - s = __l2cap_get_sock_by_psm(state, psm, src); - if (s) - bh_lock_sock(s); - read_unlock(&l2cap_sk_list.lock); - return s; -} - -static void l2cap_sock_destruct(struct sock *sk) -{ - BT_DBG("sk %p", sk); - - skb_queue_purge(&sk->sk_receive_queue); - skb_queue_purge(&sk->sk_write_queue); -} - -static void l2cap_sock_cleanup_listen(struct sock *parent) -{ - struct sock *sk; - - BT_DBG("parent %p", parent); - - /* Close not yet accepted channels */ - while ((sk = bt_accept_dequeue(parent, NULL))) - l2cap_sock_close(sk); - - parent->sk_state = BT_CLOSED; - sock_set_flag(parent, SOCK_ZAPPED); -} - -/* Kill socket (only if zapped and orphan) - * Must be called on unlocked socket. - */ -static void l2cap_sock_kill(struct sock *sk) -{ - if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) - return; - - BT_DBG("sk %p state %d", sk, sk->sk_state); - - /* Kill poor orphan */ - bt_sock_unlink(&l2cap_sk_list, sk); - sock_set_flag(sk, SOCK_DEAD); - sock_put(sk); -} - -static void __l2cap_sock_close(struct sock *sk, int reason) -{ - BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); - - switch (sk->sk_state) { - case BT_LISTEN: - l2cap_sock_cleanup_listen(sk); - break; - - case BT_CONNECTED: - case BT_CONFIG: - if (sk->sk_type == SOCK_SEQPACKET || - sk->sk_type == SOCK_STREAM) { - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - - l2cap_sock_set_timer(sk, sk->sk_sndtimeo); - l2cap_send_disconn_req(conn, sk, reason); - } else - l2cap_chan_del(sk, reason); - break; - - case BT_CONNECT2: - if (sk->sk_type == SOCK_SEQPACKET || - sk->sk_type == SOCK_STREAM) { - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct l2cap_conn_rsp rsp; - __u16 result; - - if (bt_sk(sk)->defer_setup) - result = L2CAP_CR_SEC_BLOCK; - else - result = L2CAP_CR_BAD_PSM; - - rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); - rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); - rsp.result = cpu_to_le16(result); - rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_RSP, sizeof(rsp), &rsp); - } else - l2cap_chan_del(sk, reason); - break; - - case BT_CONNECT: - case BT_DISCONN: - l2cap_chan_del(sk, reason); - break; - - default: - sock_set_flag(sk, SOCK_ZAPPED); - break; - } -} - -/* Must be called on unlocked socket. */ -static void l2cap_sock_close(struct sock *sk) -{ - l2cap_sock_clear_timer(sk); - lock_sock(sk); - __l2cap_sock_close(sk, ECONNRESET); - release_sock(sk); - l2cap_sock_kill(sk); -} - -static void l2cap_sock_init(struct sock *sk, struct sock *parent) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - - BT_DBG("sk %p", sk); - - if (parent) { - sk->sk_type = parent->sk_type; - bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; - - pi->imtu = l2cap_pi(parent)->imtu; - pi->omtu = l2cap_pi(parent)->omtu; - pi->conf_state = l2cap_pi(parent)->conf_state; - pi->mode = l2cap_pi(parent)->mode; - pi->fcs = l2cap_pi(parent)->fcs; - pi->max_tx = l2cap_pi(parent)->max_tx; - pi->tx_win = l2cap_pi(parent)->tx_win; - pi->sec_level = l2cap_pi(parent)->sec_level; - pi->role_switch = l2cap_pi(parent)->role_switch; - pi->force_reliable = l2cap_pi(parent)->force_reliable; - } else { - pi->imtu = L2CAP_DEFAULT_MTU; - pi->omtu = 0; - if (enable_ertm && sk->sk_type == SOCK_STREAM) { - pi->mode = L2CAP_MODE_ERTM; - pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; - } else { - pi->mode = L2CAP_MODE_BASIC; - } - pi->max_tx = L2CAP_DEFAULT_MAX_TX; - pi->fcs = L2CAP_FCS_CRC16; - pi->tx_win = L2CAP_DEFAULT_TX_WINDOW; - pi->sec_level = BT_SECURITY_LOW; - pi->role_switch = 0; - pi->force_reliable = 0; - } - - /* Default config options */ - pi->conf_len = 0; - pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; - skb_queue_head_init(TX_QUEUE(sk)); - skb_queue_head_init(SREJ_QUEUE(sk)); - skb_queue_head_init(BUSY_QUEUE(sk)); - INIT_LIST_HEAD(SREJ_LIST(sk)); -} - -static struct proto l2cap_proto = { - .name = "L2CAP", - .owner = THIS_MODULE, - .obj_size = sizeof(struct l2cap_pinfo) -}; - -static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) -{ - struct sock *sk; - - sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); - if (!sk) - return NULL; - - sock_init_data(sock, sk); - INIT_LIST_HEAD(&bt_sk(sk)->accept_q); - - sk->sk_destruct = l2cap_sock_destruct; - sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); - - sock_reset_flag(sk, SOCK_ZAPPED); - - sk->sk_protocol = proto; - sk->sk_state = BT_OPEN; - - setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); - - bt_sock_link(&l2cap_sk_list, sk); - return sk; -} - -static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, - int kern) -{ - struct sock *sk; - - BT_DBG("sock %p", sock); - - sock->state = SS_UNCONNECTED; - - if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && - sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) - return -ESOCKTNOSUPPORT; - - if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) - return -EPERM; - - sock->ops = &l2cap_sock_ops; - - sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); - if (!sk) - return -ENOMEM; - - l2cap_sock_init(sk, NULL); - return 0; -} - -static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) -{ - struct sock *sk = sock->sk; - struct sockaddr_l2 la; - int len, err = 0; - - BT_DBG("sk %p", sk); - - if (!addr || addr->sa_family != AF_BLUETOOTH) - return -EINVAL; - - memset(&la, 0, sizeof(la)); - len = min_t(unsigned int, sizeof(la), alen); - memcpy(&la, addr, len); - - if (la.l2_cid) - return -EINVAL; - - lock_sock(sk); - - if (sk->sk_state != BT_OPEN) { - err = -EBADFD; - goto done; - } - - if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && - !capable(CAP_NET_BIND_SERVICE)) { - err = -EACCES; - goto done; - } - - write_lock_bh(&l2cap_sk_list.lock); - - if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { - err = -EADDRINUSE; - } else { - /* Save source address */ - bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); - l2cap_pi(sk)->psm = la.l2_psm; - l2cap_pi(sk)->sport = la.l2_psm; - sk->sk_state = BT_BOUND; - - if (__le16_to_cpu(la.l2_psm) == 0x0001 || - __le16_to_cpu(la.l2_psm) == 0x0003) - l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; - } - - write_unlock_bh(&l2cap_sk_list.lock); - -done: - release_sock(sk); - return err; -} - -static int l2cap_do_connect(struct sock *sk) -{ - bdaddr_t *src = &bt_sk(sk)->src; - bdaddr_t *dst = &bt_sk(sk)->dst; - struct l2cap_conn *conn; - struct hci_conn *hcon; - struct hci_dev *hdev; - __u8 auth_type; - int err; - - BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), - l2cap_pi(sk)->psm); - - hdev = hci_get_route(dst, src); - if (!hdev) - return -EHOSTUNREACH; - - hci_dev_lock_bh(hdev); - - err = -ENOMEM; - - if (sk->sk_type == SOCK_RAW) { - switch (l2cap_pi(sk)->sec_level) { - case BT_SECURITY_HIGH: - auth_type = HCI_AT_DEDICATED_BONDING_MITM; - break; - case BT_SECURITY_MEDIUM: - auth_type = HCI_AT_DEDICATED_BONDING; - break; - default: - auth_type = HCI_AT_NO_BONDING; - break; - } - } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { - if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) - auth_type = HCI_AT_NO_BONDING_MITM; - else - auth_type = HCI_AT_NO_BONDING; - - if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) - l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; - } else { - switch (l2cap_pi(sk)->sec_level) { - case BT_SECURITY_HIGH: - auth_type = HCI_AT_GENERAL_BONDING_MITM; - break; - case BT_SECURITY_MEDIUM: - auth_type = HCI_AT_GENERAL_BONDING; - break; - default: - auth_type = HCI_AT_NO_BONDING; - break; - } - } - - hcon = hci_connect(hdev, ACL_LINK, dst, - l2cap_pi(sk)->sec_level, auth_type); - if (!hcon) - goto done; - - conn = l2cap_conn_add(hcon, 0); - if (!conn) { - hci_conn_put(hcon); - goto done; - } - - err = 0; - - /* Update source addr of the socket */ - bacpy(src, conn->src); - - l2cap_chan_add(conn, sk, NULL); - - sk->sk_state = BT_CONNECT; - l2cap_sock_set_timer(sk, sk->sk_sndtimeo); - - if (hcon->state == BT_CONNECTED) { - if (sk->sk_type != SOCK_SEQPACKET && - sk->sk_type != SOCK_STREAM) { - l2cap_sock_clear_timer(sk); - sk->sk_state = BT_CONNECTED; - } else - l2cap_do_start(sk); - } - -done: - hci_dev_unlock_bh(hdev); - hci_dev_put(hdev); - return err; -} - -static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) -{ - struct sock *sk = sock->sk; - struct sockaddr_l2 la; - int len, err = 0; - - BT_DBG("sk %p", sk); - - if (!addr || alen < sizeof(addr->sa_family) || - addr->sa_family != AF_BLUETOOTH) - return -EINVAL; - - memset(&la, 0, sizeof(la)); - len = min_t(unsigned int, sizeof(la), alen); - memcpy(&la, addr, len); - - if (la.l2_cid) - return -EINVAL; - - lock_sock(sk); - - if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) - && !la.l2_psm) { - err = -EINVAL; - goto done; - } - - switch (l2cap_pi(sk)->mode) { - case L2CAP_MODE_BASIC: - break; - case L2CAP_MODE_ERTM: - case L2CAP_MODE_STREAMING: - if (enable_ertm) - break; - /* fall through */ - default: - err = -ENOTSUPP; - goto done; - } - - switch (sk->sk_state) { - case BT_CONNECT: - case BT_CONNECT2: - case BT_CONFIG: - /* Already connecting */ - goto wait; - - case BT_CONNECTED: - /* Already connected */ - err = -EISCONN; - goto done; - - case BT_OPEN: - case BT_BOUND: - /* Can connect */ - break; - - default: - err = -EBADFD; - goto done; - } - - /* Set destination address and psm */ - bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); - l2cap_pi(sk)->psm = la.l2_psm; - - err = l2cap_do_connect(sk); - if (err) - goto done; - -wait: - err = bt_sock_wait_state(sk, BT_CONNECTED, - sock_sndtimeo(sk, flags & O_NONBLOCK)); -done: - release_sock(sk); - return err; -} - -static int l2cap_sock_listen(struct socket *sock, int backlog) -{ - struct sock *sk = sock->sk; - int err = 0; - - BT_DBG("sk %p backlog %d", sk, backlog); - - lock_sock(sk); - - if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) - || sk->sk_state != BT_BOUND) { - err = -EBADFD; - goto done; - } - - switch (l2cap_pi(sk)->mode) { - case L2CAP_MODE_BASIC: - break; - case L2CAP_MODE_ERTM: - case L2CAP_MODE_STREAMING: - if (enable_ertm) - break; - /* fall through */ - default: - err = -ENOTSUPP; - goto done; - } - - if (!l2cap_pi(sk)->psm) { - bdaddr_t *src = &bt_sk(sk)->src; - u16 psm; - - err = -EINVAL; - - write_lock_bh(&l2cap_sk_list.lock); - - for (psm = 0x1001; psm < 0x1100; psm += 2) - if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { - l2cap_pi(sk)->psm = cpu_to_le16(psm); - l2cap_pi(sk)->sport = cpu_to_le16(psm); - err = 0; - break; - } - - write_unlock_bh(&l2cap_sk_list.lock); - - if (err < 0) - goto done; - } - - sk->sk_max_ack_backlog = backlog; - sk->sk_ack_backlog = 0; - sk->sk_state = BT_LISTEN; - -done: - release_sock(sk); - return err; -} - -static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) -{ - DECLARE_WAITQUEUE(wait, current); - struct sock *sk = sock->sk, *nsk; - long timeo; - int err = 0; - - lock_sock_nested(sk, SINGLE_DEPTH_NESTING); - - if (sk->sk_state != BT_LISTEN) { - err = -EBADFD; - goto done; - } - - timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); - - BT_DBG("sk %p timeo %ld", sk, timeo); - - /* Wait for an incoming connection. (wake-one). */ - add_wait_queue_exclusive(sk_sleep(sk), &wait); - while (!(nsk = bt_accept_dequeue(sk, newsock))) { - set_current_state(TASK_INTERRUPTIBLE); - if (!timeo) { - err = -EAGAIN; - break; - } - - release_sock(sk); - timeo = schedule_timeout(timeo); - lock_sock_nested(sk, SINGLE_DEPTH_NESTING); - - if (sk->sk_state != BT_LISTEN) { - err = -EBADFD; - break; - } - - if (signal_pending(current)) { - err = sock_intr_errno(timeo); - break; - } - } - set_current_state(TASK_RUNNING); - remove_wait_queue(sk_sleep(sk), &wait); - - if (err) - goto done; - - newsock->state = SS_CONNECTED; - - BT_DBG("new socket %p", nsk); - -done: - release_sock(sk); - return err; -} - -static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) -{ - struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; - struct sock *sk = sock->sk; - - BT_DBG("sock %p, sk %p", sock, sk); - - addr->sa_family = AF_BLUETOOTH; - *len = sizeof(struct sockaddr_l2); - - if (peer) { - la->l2_psm = l2cap_pi(sk)->psm; - bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); - la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); - } else { - la->l2_psm = l2cap_pi(sk)->sport; - bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); - la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); - } - - return 0; -} - -static int __l2cap_wait_ack(struct sock *sk) -{ - DECLARE_WAITQUEUE(wait, current); - int err = 0; - int timeo = HZ/5; - - add_wait_queue(sk_sleep(sk), &wait); - while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { - set_current_state(TASK_INTERRUPTIBLE); - - if (!timeo) - timeo = HZ/5; - - if (signal_pending(current)) { - err = sock_intr_errno(timeo); - break; - } - - release_sock(sk); - timeo = schedule_timeout(timeo); - lock_sock(sk); - - err = sock_error(sk); - if (err) - break; - } - set_current_state(TASK_RUNNING); - remove_wait_queue(sk_sleep(sk), &wait); - return err; -} - -static void l2cap_monitor_timeout(unsigned long arg) -{ - struct sock *sk = (void *) arg; - - BT_DBG("sk %p", sk); - - bh_lock_sock(sk); - if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { - l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); - bh_unlock_sock(sk); - return; - } - - l2cap_pi(sk)->retry_count++; - __mod_monitor_timer(); - - l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); - bh_unlock_sock(sk); -} - -static void l2cap_retrans_timeout(unsigned long arg) -{ - struct sock *sk = (void *) arg; - - BT_DBG("sk %p", sk); - - bh_lock_sock(sk); - l2cap_pi(sk)->retry_count = 1; - __mod_monitor_timer(); - - l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; - - l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); - bh_unlock_sock(sk); -} - -static void l2cap_drop_acked_frames(struct sock *sk) -{ - struct sk_buff *skb; - - while ((skb = skb_peek(TX_QUEUE(sk))) && - l2cap_pi(sk)->unacked_frames) { - if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) - break; - - skb = skb_dequeue(TX_QUEUE(sk)); - kfree_skb(skb); - - l2cap_pi(sk)->unacked_frames--; - } - - if (!l2cap_pi(sk)->unacked_frames) - del_timer(&l2cap_pi(sk)->retrans_timer); -} - -static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - - BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); - - hci_send_acl(pi->conn->hcon, skb, 0); -} - -static void l2cap_streaming_send(struct sock *sk) -{ - struct sk_buff *skb, *tx_skb; - struct l2cap_pinfo *pi = l2cap_pi(sk); - u16 control, fcs; - - while ((skb = sk->sk_send_head)) { - tx_skb = skb_clone(skb, GFP_ATOMIC); - - control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); - control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; - put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); - - if (pi->fcs == L2CAP_FCS_CRC16) { - fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); - put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); - } - - l2cap_do_send(sk, tx_skb); - - pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; - - if (skb_queue_is_last(TX_QUEUE(sk), skb)) - sk->sk_send_head = NULL; - else - sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); - - skb = skb_dequeue(TX_QUEUE(sk)); - kfree_skb(skb); - } -} - -static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *skb, *tx_skb; - u16 control, fcs; - - skb = skb_peek(TX_QUEUE(sk)); - if (!skb) - return; - - do { - if (bt_cb(skb)->tx_seq == tx_seq) - break; - - if (skb_queue_is_last(TX_QUEUE(sk), skb)) - return; - - } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); - - if (pi->remote_max_tx && - bt_cb(skb)->retries == pi->remote_max_tx) { - l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); - return; - } - - tx_skb = skb_clone(skb, GFP_ATOMIC); - bt_cb(skb)->retries++; - control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); - - if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { - control |= L2CAP_CTRL_FINAL; - pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; - } - - control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) - | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); - - put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); - - if (pi->fcs == L2CAP_FCS_CRC16) { - fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); - put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); - } - - l2cap_do_send(sk, tx_skb); -} - -static int l2cap_ertm_send(struct sock *sk) -{ - struct sk_buff *skb, *tx_skb; - struct l2cap_pinfo *pi = l2cap_pi(sk); - u16 control, fcs; - int nsent = 0; - - if (sk->sk_state != BT_CONNECTED) - return -ENOTCONN; - - while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { - - if (pi->remote_max_tx && - bt_cb(skb)->retries == pi->remote_max_tx) { - l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); - break; - } - - tx_skb = skb_clone(skb, GFP_ATOMIC); - - bt_cb(skb)->retries++; - - control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); - control &= L2CAP_CTRL_SAR; - - if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { - control |= L2CAP_CTRL_FINAL; - pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; - } - control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) - | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); - put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); - - - if (pi->fcs == L2CAP_FCS_CRC16) { - fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); - put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); - } - - l2cap_do_send(sk, tx_skb); - - __mod_retrans_timer(); - - bt_cb(skb)->tx_seq = pi->next_tx_seq; - pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; - - pi->unacked_frames++; - pi->frames_sent++; - - if (skb_queue_is_last(TX_QUEUE(sk), skb)) - sk->sk_send_head = NULL; - else - sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); - - nsent++; - } - - return nsent; -} - -static int l2cap_retransmit_frames(struct sock *sk) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - int ret; - - if (!skb_queue_empty(TX_QUEUE(sk))) - sk->sk_send_head = TX_QUEUE(sk)->next; - - pi->next_tx_seq = pi->expected_ack_seq; - ret = l2cap_ertm_send(sk); - return ret; -} - -static void l2cap_send_ack(struct l2cap_pinfo *pi) -{ - struct sock *sk = (struct sock *)pi; - u16 control = 0; - - control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; - - if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { - control |= L2CAP_SUPER_RCV_NOT_READY; - pi->conn_state |= L2CAP_CONN_RNR_SENT; - l2cap_send_sframe(pi, control); - return; - } - - if (l2cap_ertm_send(sk) > 0) - return; - - control |= L2CAP_SUPER_RCV_READY; - l2cap_send_sframe(pi, control); -} - -static void l2cap_send_srejtail(struct sock *sk) -{ - struct srej_list *tail; - u16 control; - - control = L2CAP_SUPER_SELECT_REJECT; - control |= L2CAP_CTRL_FINAL; - - tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); - control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; - - l2cap_send_sframe(l2cap_pi(sk), control); -} - -static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct sk_buff **frag; - int err, sent = 0; - - if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) - return -EFAULT; - - sent += count; - len -= count; - - /* Continuation fragments (no L2CAP header) */ - frag = &skb_shinfo(skb)->frag_list; - while (len) { - count = min_t(unsigned int, conn->mtu, len); - - *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); - if (!*frag) - return -EFAULT; - if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) - return -EFAULT; - - sent += count; - len -= count; - - frag = &(*frag)->next; - } - - return sent; -} - -static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct sk_buff *skb; - int err, count, hlen = L2CAP_HDR_SIZE + 2; - struct l2cap_hdr *lh; - - BT_DBG("sk %p len %d", sk, (int)len); - - count = min_t(unsigned int, (conn->mtu - hlen), len); - skb = bt_skb_send_alloc(sk, count + hlen, - msg->msg_flags & MSG_DONTWAIT, &err); - if (!skb) - return ERR_PTR(-ENOMEM); - - /* Create L2CAP header */ - lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); - lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); - lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); - put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); - - err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); - if (unlikely(err < 0)) { - kfree_skb(skb); - return ERR_PTR(err); - } - return skb; -} - -static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct sk_buff *skb; - int err, count, hlen = L2CAP_HDR_SIZE; - struct l2cap_hdr *lh; - - BT_DBG("sk %p len %d", sk, (int)len); - - count = min_t(unsigned int, (conn->mtu - hlen), len); - skb = bt_skb_send_alloc(sk, count + hlen, - msg->msg_flags & MSG_DONTWAIT, &err); - if (!skb) - return ERR_PTR(-ENOMEM); - - /* Create L2CAP header */ - lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); - lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); - lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); - - err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); - if (unlikely(err < 0)) { - kfree_skb(skb); - return ERR_PTR(err); - } - return skb; -} - -static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct sk_buff *skb; - int err, count, hlen = L2CAP_HDR_SIZE + 2; - struct l2cap_hdr *lh; - - BT_DBG("sk %p len %d", sk, (int)len); - - if (!conn) - return ERR_PTR(-ENOTCONN); - - if (sdulen) - hlen += 2; - - if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) - hlen += 2; - - count = min_t(unsigned int, (conn->mtu - hlen), len); - skb = bt_skb_send_alloc(sk, count + hlen, - msg->msg_flags & MSG_DONTWAIT, &err); - if (!skb) - return ERR_PTR(-ENOMEM); - - /* Create L2CAP header */ - lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); - lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); - lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); - put_unaligned_le16(control, skb_put(skb, 2)); - if (sdulen) - put_unaligned_le16(sdulen, skb_put(skb, 2)); - - err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); - if (unlikely(err < 0)) { - kfree_skb(skb); - return ERR_PTR(err); - } - - if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) - put_unaligned_le16(0, skb_put(skb, 2)); - - bt_cb(skb)->retries = 0; - return skb; -} - -static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *skb; - struct sk_buff_head sar_queue; - u16 control; - size_t size = 0; - - skb_queue_head_init(&sar_queue); - control = L2CAP_SDU_START; - skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); - if (IS_ERR(skb)) - return PTR_ERR(skb); - - __skb_queue_tail(&sar_queue, skb); - len -= pi->remote_mps; - size += pi->remote_mps; - - while (len > 0) { - size_t buflen; - - if (len > pi->remote_mps) { - control = L2CAP_SDU_CONTINUE; - buflen = pi->remote_mps; - } else { - control = L2CAP_SDU_END; - buflen = len; - } - - skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); - if (IS_ERR(skb)) { - skb_queue_purge(&sar_queue); - return PTR_ERR(skb); - } - - __skb_queue_tail(&sar_queue, skb); - len -= buflen; - size += buflen; - } - skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); - if (sk->sk_send_head == NULL) - sk->sk_send_head = sar_queue.next; - - return size; -} - -static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) -{ - struct sock *sk = sock->sk; - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *skb; - u16 control; - int err; - - BT_DBG("sock %p, sk %p", sock, sk); - - err = sock_error(sk); - if (err) - return err; - - if (msg->msg_flags & MSG_OOB) - return -EOPNOTSUPP; - - lock_sock(sk); - - if (sk->sk_state != BT_CONNECTED) { - err = -ENOTCONN; - goto done; - } - - /* Connectionless channel */ - if (sk->sk_type == SOCK_DGRAM) { - skb = l2cap_create_connless_pdu(sk, msg, len); - if (IS_ERR(skb)) { - err = PTR_ERR(skb); - } else { - l2cap_do_send(sk, skb); - err = len; - } - goto done; - } - - switch (pi->mode) { - case L2CAP_MODE_BASIC: - /* Check outgoing MTU */ - if (len > pi->omtu) { - err = -EMSGSIZE; - goto done; - } - - /* Create a basic PDU */ - skb = l2cap_create_basic_pdu(sk, msg, len); - if (IS_ERR(skb)) { - err = PTR_ERR(skb); - goto done; - } - - l2cap_do_send(sk, skb); - err = len; - break; - - case L2CAP_MODE_ERTM: - case L2CAP_MODE_STREAMING: - /* Entire SDU fits into one PDU */ - if (len <= pi->remote_mps) { - control = L2CAP_SDU_UNSEGMENTED; - skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); - if (IS_ERR(skb)) { - err = PTR_ERR(skb); - goto done; - } - __skb_queue_tail(TX_QUEUE(sk), skb); - - if (sk->sk_send_head == NULL) - sk->sk_send_head = skb; - - } else { - /* Segment SDU into multiples PDUs */ - err = l2cap_sar_segment_sdu(sk, msg, len); - if (err < 0) - goto done; - } - - if (pi->mode == L2CAP_MODE_STREAMING) { - l2cap_streaming_send(sk); - } else { - if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && - pi->conn_state && L2CAP_CONN_WAIT_F) { - err = len; - break; - } - err = l2cap_ertm_send(sk); - } - - if (err >= 0) - err = len; - break; - - default: - BT_DBG("bad state %1.1x", pi->mode); - err = -EBADFD; - } - -done: - release_sock(sk); - return err; -} - -static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) -{ - struct sock *sk = sock->sk; - - lock_sock(sk); - - if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { - struct l2cap_conn_rsp rsp; - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - u8 buf[128]; - - sk->sk_state = BT_CONFIG; - - rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); - rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); - rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); - rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); - l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, - L2CAP_CONN_RSP, sizeof(rsp), &rsp); - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) { - release_sock(sk); - return 0; - } - - l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(sk, buf), buf); - l2cap_pi(sk)->num_conf_req++; - - release_sock(sk); - return 0; - } - - release_sock(sk); - - return bt_sock_recvmsg(iocb, sock, msg, len, flags); -} - -static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) -{ - struct sock *sk = sock->sk; - struct l2cap_options opts; - int len, err = 0; - u32 opt; - - BT_DBG("sk %p", sk); - - lock_sock(sk); - - switch (optname) { - case L2CAP_OPTIONS: - opts.imtu = l2cap_pi(sk)->imtu; - opts.omtu = l2cap_pi(sk)->omtu; - opts.flush_to = l2cap_pi(sk)->flush_to; - opts.mode = l2cap_pi(sk)->mode; - opts.fcs = l2cap_pi(sk)->fcs; - opts.max_tx = l2cap_pi(sk)->max_tx; - opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; - - len = min_t(unsigned int, sizeof(opts), optlen); - if (copy_from_user((char *) &opts, optval, len)) { - err = -EFAULT; - break; - } - - if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) { - err = -EINVAL; - break; - } - - l2cap_pi(sk)->mode = opts.mode; - switch (l2cap_pi(sk)->mode) { - case L2CAP_MODE_BASIC: - l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE; - break; - case L2CAP_MODE_ERTM: - case L2CAP_MODE_STREAMING: - if (enable_ertm) - break; - /* fall through */ - default: - err = -EINVAL; - break; - } - - l2cap_pi(sk)->imtu = opts.imtu; - l2cap_pi(sk)->omtu = opts.omtu; - l2cap_pi(sk)->fcs = opts.fcs; - l2cap_pi(sk)->max_tx = opts.max_tx; - l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; - break; - - case L2CAP_LM: - if (get_user(opt, (u32 __user *) optval)) { - err = -EFAULT; - break; - } - - if (opt & L2CAP_LM_AUTH) - l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; - if (opt & L2CAP_LM_ENCRYPT) - l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; - if (opt & L2CAP_LM_SECURE) - l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; - - l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); - l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); - break; - - default: - err = -ENOPROTOOPT; - break; - } - - release_sock(sk); - return err; -} - -static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) -{ - struct sock *sk = sock->sk; - struct bt_security sec; - int len, err = 0; - u32 opt; - - BT_DBG("sk %p", sk); - - if (level == SOL_L2CAP) - return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); - - if (level != SOL_BLUETOOTH) - return -ENOPROTOOPT; - - lock_sock(sk); - - switch (optname) { - case BT_SECURITY: - if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM - && sk->sk_type != SOCK_RAW) { - err = -EINVAL; - break; - } - - sec.level = BT_SECURITY_LOW; - - len = min_t(unsigned int, sizeof(sec), optlen); - if (copy_from_user((char *) &sec, optval, len)) { - err = -EFAULT; - break; - } - - if (sec.level < BT_SECURITY_LOW || - sec.level > BT_SECURITY_HIGH) { - err = -EINVAL; - break; - } - - l2cap_pi(sk)->sec_level = sec.level; - break; - - case BT_DEFER_SETUP: - if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { - err = -EINVAL; - break; - } - - if (get_user(opt, (u32 __user *) optval)) { - err = -EFAULT; - break; - } - - bt_sk(sk)->defer_setup = opt; - break; - - default: - err = -ENOPROTOOPT; - break; - } - - release_sock(sk); - return err; -} - -static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) -{ - struct sock *sk = sock->sk; - struct l2cap_options opts; - struct l2cap_conninfo cinfo; - int len, err = 0; - u32 opt; - - BT_DBG("sk %p", sk); - - if (get_user(len, optlen)) - return -EFAULT; - - lock_sock(sk); - - switch (optname) { - case L2CAP_OPTIONS: - opts.imtu = l2cap_pi(sk)->imtu; - opts.omtu = l2cap_pi(sk)->omtu; - opts.flush_to = l2cap_pi(sk)->flush_to; - opts.mode = l2cap_pi(sk)->mode; - opts.fcs = l2cap_pi(sk)->fcs; - opts.max_tx = l2cap_pi(sk)->max_tx; - opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; - - len = min_t(unsigned int, len, sizeof(opts)); - if (copy_to_user(optval, (char *) &opts, len)) - err = -EFAULT; - - break; - - case L2CAP_LM: - switch (l2cap_pi(sk)->sec_level) { - case BT_SECURITY_LOW: - opt = L2CAP_LM_AUTH; - break; - case BT_SECURITY_MEDIUM: - opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; - break; - case BT_SECURITY_HIGH: - opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | - L2CAP_LM_SECURE; - break; - default: - opt = 0; - break; - } - - if (l2cap_pi(sk)->role_switch) - opt |= L2CAP_LM_MASTER; - - if (l2cap_pi(sk)->force_reliable) - opt |= L2CAP_LM_RELIABLE; - - if (put_user(opt, (u32 __user *) optval)) - err = -EFAULT; - break; - - case L2CAP_CONNINFO: - if (sk->sk_state != BT_CONNECTED && - !(sk->sk_state == BT_CONNECT2 && - bt_sk(sk)->defer_setup)) { - err = -ENOTCONN; - break; - } - - cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; - memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); - - len = min_t(unsigned int, len, sizeof(cinfo)); - if (copy_to_user(optval, (char *) &cinfo, len)) - err = -EFAULT; - - break; - - default: - err = -ENOPROTOOPT; - break; - } - - release_sock(sk); - return err; -} - -static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) -{ - struct sock *sk = sock->sk; - struct bt_security sec; - int len, err = 0; - - BT_DBG("sk %p", sk); - - if (level == SOL_L2CAP) - return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); - - if (level != SOL_BLUETOOTH) - return -ENOPROTOOPT; - - if (get_user(len, optlen)) - return -EFAULT; - - lock_sock(sk); - - switch (optname) { - case BT_SECURITY: - if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM - && sk->sk_type != SOCK_RAW) { - err = -EINVAL; - break; - } - - sec.level = l2cap_pi(sk)->sec_level; - - len = min_t(unsigned int, len, sizeof(sec)); - if (copy_to_user(optval, (char *) &sec, len)) - err = -EFAULT; - - break; - - case BT_DEFER_SETUP: - if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { - err = -EINVAL; - break; - } - - if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) - err = -EFAULT; - - break; - - default: - err = -ENOPROTOOPT; - break; - } - - release_sock(sk); - return err; -} - -static int l2cap_sock_shutdown(struct socket *sock, int how) -{ - struct sock *sk = sock->sk; - int err = 0; - - BT_DBG("sock %p, sk %p", sock, sk); - - if (!sk) - return 0; - - lock_sock(sk); - if (!sk->sk_shutdown) { - if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) - err = __l2cap_wait_ack(sk); - - sk->sk_shutdown = SHUTDOWN_MASK; - l2cap_sock_clear_timer(sk); - __l2cap_sock_close(sk, 0); - - if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) - err = bt_sock_wait_state(sk, BT_CLOSED, - sk->sk_lingertime); - } - - if (!err && sk->sk_err) - err = -sk->sk_err; - - release_sock(sk); - return err; -} - -static int l2cap_sock_release(struct socket *sock) -{ - struct sock *sk = sock->sk; - int err; - - BT_DBG("sock %p, sk %p", sock, sk); - - if (!sk) - return 0; - - err = l2cap_sock_shutdown(sock, 2); - - sock_orphan(sk); - l2cap_sock_kill(sk); - return err; -} - -static void l2cap_chan_ready(struct sock *sk) -{ - struct sock *parent = bt_sk(sk)->parent; - - BT_DBG("sk %p, parent %p", sk, parent); - - l2cap_pi(sk)->conf_state = 0; - l2cap_sock_clear_timer(sk); - - if (!parent) { - /* Outgoing channel. - * Wake up socket sleeping on connect. - */ - sk->sk_state = BT_CONNECTED; - sk->sk_state_change(sk); - } else { - /* Incoming channel. - * Wake up socket sleeping on accept. - */ - parent->sk_data_ready(parent, 0); - } -} - -/* Copy frame to all raw sockets on that connection */ -static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) -{ - struct l2cap_chan_list *l = &conn->chan_list; - struct sk_buff *nskb; - struct sock *sk; - - BT_DBG("conn %p", conn); - - read_lock(&l->lock); - for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - if (sk->sk_type != SOCK_RAW) - continue; - - /* Don't send frame to the socket it came from */ - if (skb->sk == sk) - continue; - nskb = skb_clone(skb, GFP_ATOMIC); - if (!nskb) - continue; - - if (sock_queue_rcv_skb(sk, nskb)) - kfree_skb(nskb); - } - read_unlock(&l->lock); -} - -/* ---- L2CAP signalling commands ---- */ -static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, - u8 code, u8 ident, u16 dlen, void *data) -{ - struct sk_buff *skb, **frag; - struct l2cap_cmd_hdr *cmd; - struct l2cap_hdr *lh; - int len, count; - - BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", - conn, code, ident, dlen); - - len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; - count = min_t(unsigned int, conn->mtu, len); - - skb = bt_skb_alloc(count, GFP_ATOMIC); - if (!skb) - return NULL; - - lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); - lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); - lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); - - cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); - cmd->code = code; - cmd->ident = ident; - cmd->len = cpu_to_le16(dlen); - - if (dlen) { - count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; - memcpy(skb_put(skb, count), data, count); - data += count; - } - - len -= skb->len; - - /* Continuation fragments (no L2CAP header) */ - frag = &skb_shinfo(skb)->frag_list; - while (len) { - count = min_t(unsigned int, conn->mtu, len); - - *frag = bt_skb_alloc(count, GFP_ATOMIC); - if (!*frag) - goto fail; - - memcpy(skb_put(*frag, count), data, count); - - len -= count; - data += count; - - frag = &(*frag)->next; - } - - return skb; - -fail: - kfree_skb(skb); - return NULL; -} - -static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) -{ - struct l2cap_conf_opt *opt = *ptr; - int len; - - len = L2CAP_CONF_OPT_SIZE + opt->len; - *ptr += len; - - *type = opt->type; - *olen = opt->len; - - switch (opt->len) { - case 1: - *val = *((u8 *) opt->val); - break; - - case 2: - *val = __le16_to_cpu(*((__le16 *) opt->val)); - break; - - case 4: - *val = __le32_to_cpu(*((__le32 *) opt->val)); - break; - - default: - *val = (unsigned long) opt->val; - break; - } - - BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); - return len; -} - -static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) -{ - struct l2cap_conf_opt *opt = *ptr; - - BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); - - opt->type = type; - opt->len = len; - - switch (len) { - case 1: - *((u8 *) opt->val) = val; - break; - - case 2: - *((__le16 *) opt->val) = cpu_to_le16(val); - break; - - case 4: - *((__le32 *) opt->val) = cpu_to_le32(val); - break; - - default: - memcpy(opt->val, (void *) val, len); - break; - } - - *ptr += L2CAP_CONF_OPT_SIZE + len; -} - -static void l2cap_ack_timeout(unsigned long arg) -{ - struct sock *sk = (void *) arg; - - bh_lock_sock(sk); - l2cap_send_ack(l2cap_pi(sk)); - bh_unlock_sock(sk); -} - -static inline void l2cap_ertm_init(struct sock *sk) -{ - l2cap_pi(sk)->expected_ack_seq = 0; - l2cap_pi(sk)->unacked_frames = 0; - l2cap_pi(sk)->buffer_seq = 0; - l2cap_pi(sk)->num_acked = 0; - l2cap_pi(sk)->frames_sent = 0; - - setup_timer(&l2cap_pi(sk)->retrans_timer, - l2cap_retrans_timeout, (unsigned long) sk); - setup_timer(&l2cap_pi(sk)->monitor_timer, - l2cap_monitor_timeout, (unsigned long) sk); - setup_timer(&l2cap_pi(sk)->ack_timer, - l2cap_ack_timeout, (unsigned long) sk); - - __skb_queue_head_init(SREJ_QUEUE(sk)); - __skb_queue_head_init(BUSY_QUEUE(sk)); - - INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); - - sk->sk_backlog_rcv = l2cap_ertm_data_rcv; -} - -static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) -{ - switch (mode) { - case L2CAP_MODE_STREAMING: - case L2CAP_MODE_ERTM: - if (l2cap_mode_supported(mode, remote_feat_mask)) - return mode; - /* fall through */ - default: - return L2CAP_MODE_BASIC; - } -} - -static int l2cap_build_conf_req(struct sock *sk, void *data) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct l2cap_conf_req *req = data; - struct l2cap_conf_rfc rfc = { .mode = pi->mode }; - void *ptr = req->data; - - BT_DBG("sk %p", sk); - - if (pi->num_conf_req || pi->num_conf_rsp) - goto done; - - switch (pi->mode) { - case L2CAP_MODE_STREAMING: - case L2CAP_MODE_ERTM: - if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) - break; - - /* fall through */ - default: - pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); - break; - } - -done: - switch (pi->mode) { - case L2CAP_MODE_BASIC: - if (pi->imtu != L2CAP_DEFAULT_MTU) - l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); - - rfc.mode = L2CAP_MODE_BASIC; - rfc.txwin_size = 0; - rfc.max_transmit = 0; - rfc.retrans_timeout = 0; - rfc.monitor_timeout = 0; - rfc.max_pdu_size = 0; - - break; - - case L2CAP_MODE_ERTM: - rfc.mode = L2CAP_MODE_ERTM; - rfc.txwin_size = pi->tx_win; - rfc.max_transmit = pi->max_tx; - rfc.retrans_timeout = 0; - rfc.monitor_timeout = 0; - rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); - if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) - rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); - - if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) - break; - - if (pi->fcs == L2CAP_FCS_NONE || - pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { - pi->fcs = L2CAP_FCS_NONE; - l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); - } - break; - - case L2CAP_MODE_STREAMING: - rfc.mode = L2CAP_MODE_STREAMING; - rfc.txwin_size = 0; - rfc.max_transmit = 0; - rfc.retrans_timeout = 0; - rfc.monitor_timeout = 0; - rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); - if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) - rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); - - if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) - break; - - if (pi->fcs == L2CAP_FCS_NONE || - pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { - pi->fcs = L2CAP_FCS_NONE; - l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); - } - break; - } - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), - (unsigned long) &rfc); - - /* FIXME: Need actual value of the flush timeout */ - //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) - // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); - - req->dcid = cpu_to_le16(pi->dcid); - req->flags = cpu_to_le16(0); - - return ptr - data; -} - -static int l2cap_parse_conf_req(struct sock *sk, void *data) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct l2cap_conf_rsp *rsp = data; - void *ptr = rsp->data; - void *req = pi->conf_req; - int len = pi->conf_len; - int type, hint, olen; - unsigned long val; - struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; - u16 mtu = L2CAP_DEFAULT_MTU; - u16 result = L2CAP_CONF_SUCCESS; - - BT_DBG("sk %p", sk); - - while (len >= L2CAP_CONF_OPT_SIZE) { - len -= l2cap_get_conf_opt(&req, &type, &olen, &val); - - hint = type & L2CAP_CONF_HINT; - type &= L2CAP_CONF_MASK; - - switch (type) { - case L2CAP_CONF_MTU: - mtu = val; - break; - - case L2CAP_CONF_FLUSH_TO: - pi->flush_to = val; - break; - - case L2CAP_CONF_QOS: - break; - - case L2CAP_CONF_RFC: - if (olen == sizeof(rfc)) - memcpy(&rfc, (void *) val, olen); - break; - - case L2CAP_CONF_FCS: - if (val == L2CAP_FCS_NONE) - pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; - - break; - - default: - if (hint) - break; - - result = L2CAP_CONF_UNKNOWN; - *((u8 *) ptr++) = type; - break; - } - } - - if (pi->num_conf_rsp || pi->num_conf_req > 1) - goto done; - - switch (pi->mode) { - case L2CAP_MODE_STREAMING: - case L2CAP_MODE_ERTM: - if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { - pi->mode = l2cap_select_mode(rfc.mode, - pi->conn->feat_mask); - break; - } - - if (pi->mode != rfc.mode) - return -ECONNREFUSED; - - break; - } - -done: - if (pi->mode != rfc.mode) { - result = L2CAP_CONF_UNACCEPT; - rfc.mode = pi->mode; - - if (pi->num_conf_rsp == 1) - return -ECONNREFUSED; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, - sizeof(rfc), (unsigned long) &rfc); - } - - - if (result == L2CAP_CONF_SUCCESS) { - /* Configure output options and let the other side know - * which ones we don't like. */ - - if (mtu < L2CAP_DEFAULT_MIN_MTU) - result = L2CAP_CONF_UNACCEPT; - else { - pi->omtu = mtu; - pi->conf_state |= L2CAP_CONF_MTU_DONE; - } - l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); - - switch (rfc.mode) { - case L2CAP_MODE_BASIC: - pi->fcs = L2CAP_FCS_NONE; - pi->conf_state |= L2CAP_CONF_MODE_DONE; - break; - - case L2CAP_MODE_ERTM: - pi->remote_tx_win = rfc.txwin_size; - pi->remote_max_tx = rfc.max_transmit; - if (rfc.max_pdu_size > pi->conn->mtu - 10) - rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); - - pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); - - rfc.retrans_timeout = - le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); - rfc.monitor_timeout = - le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); - - pi->conf_state |= L2CAP_CONF_MODE_DONE; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, - sizeof(rfc), (unsigned long) &rfc); - - break; - - case L2CAP_MODE_STREAMING: - if (rfc.max_pdu_size > pi->conn->mtu - 10) - rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); - - pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); - - pi->conf_state |= L2CAP_CONF_MODE_DONE; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, - sizeof(rfc), (unsigned long) &rfc); - - break; - - default: - result = L2CAP_CONF_UNACCEPT; - - memset(&rfc, 0, sizeof(rfc)); - rfc.mode = pi->mode; - } - - if (result == L2CAP_CONF_SUCCESS) - pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; - } - rsp->scid = cpu_to_le16(pi->dcid); - rsp->result = cpu_to_le16(result); - rsp->flags = cpu_to_le16(0x0000); - - return ptr - data; -} - -static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct l2cap_conf_req *req = data; - void *ptr = req->data; - int type, olen; - unsigned long val; - struct l2cap_conf_rfc rfc; - - BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); - - while (len >= L2CAP_CONF_OPT_SIZE) { - len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); - - switch (type) { - case L2CAP_CONF_MTU: - if (val < L2CAP_DEFAULT_MIN_MTU) { - *result = L2CAP_CONF_UNACCEPT; - pi->omtu = L2CAP_DEFAULT_MIN_MTU; - } else - pi->omtu = val; - l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); - break; - - case L2CAP_CONF_FLUSH_TO: - pi->flush_to = val; - l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, - 2, pi->flush_to); - break; - - case L2CAP_CONF_RFC: - if (olen == sizeof(rfc)) - memcpy(&rfc, (void *)val, olen); - - if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && - rfc.mode != pi->mode) - return -ECONNREFUSED; - - pi->fcs = 0; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, - sizeof(rfc), (unsigned long) &rfc); - break; - } - } - - if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) - return -ECONNREFUSED; - - pi->mode = rfc.mode; - - if (*result == L2CAP_CONF_SUCCESS) { - switch (rfc.mode) { - case L2CAP_MODE_ERTM: - pi->remote_tx_win = rfc.txwin_size; - pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); - pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); - pi->mps = le16_to_cpu(rfc.max_pdu_size); - break; - case L2CAP_MODE_STREAMING: - pi->mps = le16_to_cpu(rfc.max_pdu_size); - } - } - - req->dcid = cpu_to_le16(pi->dcid); - req->flags = cpu_to_le16(0x0000); - - return ptr - data; -} - -static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) -{ - struct l2cap_conf_rsp *rsp = data; - void *ptr = rsp->data; - - BT_DBG("sk %p", sk); - - rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); - rsp->result = cpu_to_le16(result); - rsp->flags = cpu_to_le16(flags); - - return ptr - data; -} - -static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - int type, olen; - unsigned long val; - struct l2cap_conf_rfc rfc; - - BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); - - if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) - return; - - while (len >= L2CAP_CONF_OPT_SIZE) { - len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); - - switch (type) { - case L2CAP_CONF_RFC: - if (olen == sizeof(rfc)) - memcpy(&rfc, (void *)val, olen); - goto done; - } - } - -done: - switch (rfc.mode) { - case L2CAP_MODE_ERTM: - pi->remote_tx_win = rfc.txwin_size; - pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); - pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); - pi->mps = le16_to_cpu(rfc.max_pdu_size); - break; - case L2CAP_MODE_STREAMING: - pi->mps = le16_to_cpu(rfc.max_pdu_size); - } -} - -static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; - - if (rej->reason != 0x0000) - return 0; - - if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && - cmd->ident == conn->info_ident) { - del_timer(&conn->info_timer); - - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; - conn->info_ident = 0; - - l2cap_conn_start(conn); - } - - return 0; -} - -static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_chan_list *list = &conn->chan_list; - struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; - struct l2cap_conn_rsp rsp; - struct sock *parent, *uninitialized_var(sk); - int result, status = L2CAP_CS_NO_INFO; - - u16 dcid = 0, scid = __le16_to_cpu(req->scid); - __le16 psm = req->psm; - - BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); - - /* Check if we have socket listening on psm */ - parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); - if (!parent) { - result = L2CAP_CR_BAD_PSM; - goto sendresp; - } - - /* Check if the ACL is secure enough (if not SDP) */ - if (psm != cpu_to_le16(0x0001) && - !hci_conn_check_link_mode(conn->hcon)) { - conn->disc_reason = 0x05; - result = L2CAP_CR_SEC_BLOCK; - goto response; - } - - result = L2CAP_CR_NO_MEM; - - /* Check for backlog size */ - if (sk_acceptq_is_full(parent)) { - BT_DBG("backlog full %d", parent->sk_ack_backlog); - goto response; - } - - sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); - if (!sk) - goto response; - - write_lock_bh(&list->lock); - - /* Check if we already have channel with that dcid */ - if (__l2cap_get_chan_by_dcid(list, scid)) { - write_unlock_bh(&list->lock); - sock_set_flag(sk, SOCK_ZAPPED); - l2cap_sock_kill(sk); - goto response; - } - - hci_conn_hold(conn->hcon); - - l2cap_sock_init(sk, parent); - bacpy(&bt_sk(sk)->src, conn->src); - bacpy(&bt_sk(sk)->dst, conn->dst); - l2cap_pi(sk)->psm = psm; - l2cap_pi(sk)->dcid = scid; - - __l2cap_chan_add(conn, sk, parent); - dcid = l2cap_pi(sk)->scid; - - l2cap_sock_set_timer(sk, sk->sk_sndtimeo); - - l2cap_pi(sk)->ident = cmd->ident; - - if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { - if (l2cap_check_security(sk)) { - if (bt_sk(sk)->defer_setup) { - sk->sk_state = BT_CONNECT2; - result = L2CAP_CR_PEND; - status = L2CAP_CS_AUTHOR_PEND; - parent->sk_data_ready(parent, 0); - } else { - sk->sk_state = BT_CONFIG; - result = L2CAP_CR_SUCCESS; - status = L2CAP_CS_NO_INFO; - } - } else { - sk->sk_state = BT_CONNECT2; - result = L2CAP_CR_PEND; - status = L2CAP_CS_AUTHEN_PEND; - } - } else { - sk->sk_state = BT_CONNECT2; - result = L2CAP_CR_PEND; - status = L2CAP_CS_NO_INFO; - } - - write_unlock_bh(&list->lock); - -response: - bh_unlock_sock(parent); - -sendresp: - rsp.scid = cpu_to_le16(scid); - rsp.dcid = cpu_to_le16(dcid); - rsp.result = cpu_to_le16(result); - rsp.status = cpu_to_le16(status); - l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); - - if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { - struct l2cap_info_req info; - info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); - - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; - conn->info_ident = l2cap_get_ident(conn); - - mod_timer(&conn->info_timer, jiffies + - msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); - - l2cap_send_cmd(conn, conn->info_ident, - L2CAP_INFO_REQ, sizeof(info), &info); - } - - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && - result == L2CAP_CR_SUCCESS) { - u8 buf[128]; - l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(sk, buf), buf); - l2cap_pi(sk)->num_conf_req++; - } - - return 0; -} - -static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; - u16 scid, dcid, result, status; - struct sock *sk; - u8 req[128]; - - scid = __le16_to_cpu(rsp->scid); - dcid = __le16_to_cpu(rsp->dcid); - result = __le16_to_cpu(rsp->result); - status = __le16_to_cpu(rsp->status); - - BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); - - if (scid) { - sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); - if (!sk) - return -EFAULT; - } else { - sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); - if (!sk) - return -EFAULT; - } - - switch (result) { - case L2CAP_CR_SUCCESS: - sk->sk_state = BT_CONFIG; - l2cap_pi(sk)->ident = 0; - l2cap_pi(sk)->dcid = dcid; - l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) - break; - - l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; - - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(sk, req), req); - l2cap_pi(sk)->num_conf_req++; - break; - - case L2CAP_CR_PEND: - l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; - break; - - default: - l2cap_chan_del(sk, ECONNREFUSED); - break; - } - - bh_unlock_sock(sk); - return 0; -} - -static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) -{ - struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; - u16 dcid, flags; - u8 rsp[64]; - struct sock *sk; - int len; - - dcid = __le16_to_cpu(req->dcid); - flags = __le16_to_cpu(req->flags); - - BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); - - sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); - if (!sk) - return -ENOENT; - - if (sk->sk_state != BT_CONFIG) { - struct l2cap_cmd_rej rej; - - rej.reason = cpu_to_le16(0x0002); - l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, - sizeof(rej), &rej); - goto unlock; - } - - /* Reject if config buffer is too small. */ - len = cmd_len - sizeof(*req); - if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { - l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, - l2cap_build_conf_rsp(sk, rsp, - L2CAP_CONF_REJECT, flags), rsp); - goto unlock; - } - - /* Store config. */ - memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); - l2cap_pi(sk)->conf_len += len; - - if (flags & 0x0001) { - /* Incomplete config. Send empty response. */ - l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, - l2cap_build_conf_rsp(sk, rsp, - L2CAP_CONF_SUCCESS, 0x0001), rsp); - goto unlock; - } - - /* Complete config. */ - len = l2cap_parse_conf_req(sk, rsp); - if (len < 0) { - l2cap_send_disconn_req(conn, sk, ECONNRESET); - goto unlock; - } - - l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); - l2cap_pi(sk)->num_conf_rsp++; - - /* Reset config buffer. */ - l2cap_pi(sk)->conf_len = 0; - - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) - goto unlock; - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || - l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) - l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; - - sk->sk_state = BT_CONNECTED; - - l2cap_pi(sk)->next_tx_seq = 0; - l2cap_pi(sk)->expected_tx_seq = 0; - __skb_queue_head_init(TX_QUEUE(sk)); - if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) - l2cap_ertm_init(sk); - - l2cap_chan_ready(sk); - goto unlock; - } - - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { - u8 buf[64]; - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(sk, buf), buf); - l2cap_pi(sk)->num_conf_req++; - } - -unlock: - bh_unlock_sock(sk); - return 0; -} - -static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; - u16 scid, flags, result; - struct sock *sk; - int len = cmd->len - sizeof(*rsp); - - scid = __le16_to_cpu(rsp->scid); - flags = __le16_to_cpu(rsp->flags); - result = __le16_to_cpu(rsp->result); - - BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", - scid, flags, result); - - sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); - if (!sk) - return 0; - - switch (result) { - case L2CAP_CONF_SUCCESS: - l2cap_conf_rfc_get(sk, rsp->data, len); - break; - - case L2CAP_CONF_UNACCEPT: - if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { - char req[64]; - - if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { - l2cap_send_disconn_req(conn, sk, ECONNRESET); - goto done; - } - - /* throw out any old stored conf requests */ - result = L2CAP_CONF_SUCCESS; - len = l2cap_parse_conf_rsp(sk, rsp->data, - len, req, &result); - if (len < 0) { - l2cap_send_disconn_req(conn, sk, ECONNRESET); - goto done; - } - - l2cap_send_cmd(conn, l2cap_get_ident(conn), - L2CAP_CONF_REQ, len, req); - l2cap_pi(sk)->num_conf_req++; - if (result != L2CAP_CONF_SUCCESS) - goto done; - break; - } - - default: - sk->sk_err = ECONNRESET; - l2cap_sock_set_timer(sk, HZ * 5); - l2cap_send_disconn_req(conn, sk, ECONNRESET); - goto done; - } - - if (flags & 0x01) - goto done; - - l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || - l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) - l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; - - sk->sk_state = BT_CONNECTED; - l2cap_pi(sk)->next_tx_seq = 0; - l2cap_pi(sk)->expected_tx_seq = 0; - __skb_queue_head_init(TX_QUEUE(sk)); - if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) - l2cap_ertm_init(sk); - - l2cap_chan_ready(sk); - } - -done: - bh_unlock_sock(sk); - return 0; -} - -static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; - struct l2cap_disconn_rsp rsp; - u16 dcid, scid; - struct sock *sk; - - scid = __le16_to_cpu(req->scid); - dcid = __le16_to_cpu(req->dcid); - - BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); - - sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); - if (!sk) - return 0; - - rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); - rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); - l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); - - sk->sk_shutdown = SHUTDOWN_MASK; - - l2cap_chan_del(sk, ECONNRESET); - bh_unlock_sock(sk); - - l2cap_sock_kill(sk); - return 0; -} - -static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; - u16 dcid, scid; - struct sock *sk; - - scid = __le16_to_cpu(rsp->scid); - dcid = __le16_to_cpu(rsp->dcid); - - BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); - - sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); - if (!sk) - return 0; - - l2cap_chan_del(sk, 0); - bh_unlock_sock(sk); - - l2cap_sock_kill(sk); - return 0; -} - -static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_info_req *req = (struct l2cap_info_req *) data; - u16 type; - - type = __le16_to_cpu(req->type); - - BT_DBG("type 0x%4.4x", type); - - if (type == L2CAP_IT_FEAT_MASK) { - u8 buf[8]; - u32 feat_mask = l2cap_feat_mask; - struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; - rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); - rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); - if (enable_ertm) - feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING - | L2CAP_FEAT_FCS; - put_unaligned_le32(feat_mask, rsp->data); - l2cap_send_cmd(conn, cmd->ident, - L2CAP_INFO_RSP, sizeof(buf), buf); - } else if (type == L2CAP_IT_FIXED_CHAN) { - u8 buf[12]; - struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; - rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); - rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); - memcpy(buf + 4, l2cap_fixed_chan, 8); - l2cap_send_cmd(conn, cmd->ident, - L2CAP_INFO_RSP, sizeof(buf), buf); - } else { - struct l2cap_info_rsp rsp; - rsp.type = cpu_to_le16(type); - rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); - l2cap_send_cmd(conn, cmd->ident, - L2CAP_INFO_RSP, sizeof(rsp), &rsp); - } - - return 0; -} - -static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; - u16 type, result; - - type = __le16_to_cpu(rsp->type); - result = __le16_to_cpu(rsp->result); - - BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); - - del_timer(&conn->info_timer); - - if (type == L2CAP_IT_FEAT_MASK) { - conn->feat_mask = get_unaligned_le32(rsp->data); - - if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { - struct l2cap_info_req req; - req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); - - conn->info_ident = l2cap_get_ident(conn); - - l2cap_send_cmd(conn, conn->info_ident, - L2CAP_INFO_REQ, sizeof(req), &req); - } else { - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; - conn->info_ident = 0; - - l2cap_conn_start(conn); - } - } else if (type == L2CAP_IT_FIXED_CHAN) { - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; - conn->info_ident = 0; - - l2cap_conn_start(conn); - } - - return 0; -} - -static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) -{ - u8 *data = skb->data; - int len = skb->len; - struct l2cap_cmd_hdr cmd; - int err = 0; - - l2cap_raw_recv(conn, skb); - - while (len >= L2CAP_CMD_HDR_SIZE) { - u16 cmd_len; - memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); - data += L2CAP_CMD_HDR_SIZE; - len -= L2CAP_CMD_HDR_SIZE; - - cmd_len = le16_to_cpu(cmd.len); - - BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); - - if (cmd_len > len || !cmd.ident) { - BT_DBG("corrupted command"); - break; - } - - switch (cmd.code) { - case L2CAP_COMMAND_REJ: - l2cap_command_rej(conn, &cmd, data); - break; - - case L2CAP_CONN_REQ: - err = l2cap_connect_req(conn, &cmd, data); - break; - - case L2CAP_CONN_RSP: - err = l2cap_connect_rsp(conn, &cmd, data); - break; - - case L2CAP_CONF_REQ: - err = l2cap_config_req(conn, &cmd, cmd_len, data); - break; - - case L2CAP_CONF_RSP: - err = l2cap_config_rsp(conn, &cmd, data); - break; - - case L2CAP_DISCONN_REQ: - err = l2cap_disconnect_req(conn, &cmd, data); - break; - - case L2CAP_DISCONN_RSP: - err = l2cap_disconnect_rsp(conn, &cmd, data); - break; - - case L2CAP_ECHO_REQ: - l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); - break; - - case L2CAP_ECHO_RSP: - break; - - case L2CAP_INFO_REQ: - err = l2cap_information_req(conn, &cmd, data); - break; - - case L2CAP_INFO_RSP: - err = l2cap_information_rsp(conn, &cmd, data); - break; - - default: - BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); - err = -EINVAL; - break; - } - - if (err) { - struct l2cap_cmd_rej rej; - BT_DBG("error %d", err); - - /* FIXME: Map err to a valid reason */ - rej.reason = cpu_to_le16(0); - l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); - } - - data += cmd_len; - len -= cmd_len; - } - - kfree_skb(skb); -} - -static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) -{ - u16 our_fcs, rcv_fcs; - int hdr_size = L2CAP_HDR_SIZE + 2; - - if (pi->fcs == L2CAP_FCS_CRC16) { - skb_trim(skb, skb->len - 2); - rcv_fcs = get_unaligned_le16(skb->data + skb->len); - our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); - - if (our_fcs != rcv_fcs) - return -EBADMSG; - } - return 0; -} - -static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u16 control = 0; - - pi->frames_sent = 0; - - control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; - - if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { - control |= L2CAP_SUPER_RCV_NOT_READY; - l2cap_send_sframe(pi, control); - pi->conn_state |= L2CAP_CONN_RNR_SENT; - } - - if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) - l2cap_retransmit_frames(sk); - - l2cap_ertm_send(sk); - - if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && - pi->frames_sent == 0) { - control |= L2CAP_SUPER_RCV_READY; - l2cap_send_sframe(pi, control); - } -} - -static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) -{ - struct sk_buff *next_skb; - struct l2cap_pinfo *pi = l2cap_pi(sk); - int tx_seq_offset, next_tx_seq_offset; - - bt_cb(skb)->tx_seq = tx_seq; - bt_cb(skb)->sar = sar; - - next_skb = skb_peek(SREJ_QUEUE(sk)); - if (!next_skb) { - __skb_queue_tail(SREJ_QUEUE(sk), skb); - return 0; - } - - tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; - if (tx_seq_offset < 0) - tx_seq_offset += 64; - - do { - if (bt_cb(next_skb)->tx_seq == tx_seq) - return -EINVAL; - - next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - - pi->buffer_seq) % 64; - if (next_tx_seq_offset < 0) - next_tx_seq_offset += 64; - - if (next_tx_seq_offset > tx_seq_offset) { - __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); - return 0; - } - - if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) - break; - - } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); - - __skb_queue_tail(SREJ_QUEUE(sk), skb); - - return 0; -} - -static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *_skb; - int err; - - switch (control & L2CAP_CTRL_SAR) { - case L2CAP_SDU_UNSEGMENTED: - if (pi->conn_state & L2CAP_CONN_SAR_SDU) - goto drop; - - err = sock_queue_rcv_skb(sk, skb); - if (!err) - return err; - - break; - - case L2CAP_SDU_START: - if (pi->conn_state & L2CAP_CONN_SAR_SDU) - goto drop; - - pi->sdu_len = get_unaligned_le16(skb->data); - - if (pi->sdu_len > pi->imtu) - goto disconnect; - - pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); - if (!pi->sdu) - return -ENOMEM; - - /* pull sdu_len bytes only after alloc, because of Local Busy - * condition we have to be sure that this will be executed - * only once, i.e., when alloc does not fail */ - skb_pull(skb, 2); - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - - pi->conn_state |= L2CAP_CONN_SAR_SDU; - pi->partial_sdu_len = skb->len; - break; - - case L2CAP_SDU_CONTINUE: - if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) - goto disconnect; - - if (!pi->sdu) - goto disconnect; - - pi->partial_sdu_len += skb->len; - if (pi->partial_sdu_len > pi->sdu_len) - goto drop; - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - - break; - - case L2CAP_SDU_END: - if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) - goto disconnect; - - if (!pi->sdu) - goto disconnect; - - if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { - pi->partial_sdu_len += skb->len; - - if (pi->partial_sdu_len > pi->imtu) - goto drop; - - if (pi->partial_sdu_len != pi->sdu_len) - goto drop; - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - } - - _skb = skb_clone(pi->sdu, GFP_ATOMIC); - if (!_skb) { - pi->conn_state |= L2CAP_CONN_SAR_RETRY; - return -ENOMEM; - } - - err = sock_queue_rcv_skb(sk, _skb); - if (err < 0) { - kfree_skb(_skb); - pi->conn_state |= L2CAP_CONN_SAR_RETRY; - return err; - } - - pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; - pi->conn_state &= ~L2CAP_CONN_SAR_SDU; - - kfree_skb(pi->sdu); - break; - } - - kfree_skb(skb); - return 0; - -drop: - kfree_skb(pi->sdu); - pi->sdu = NULL; - -disconnect: - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - kfree_skb(skb); - return 0; -} - -static int l2cap_try_push_rx_skb(struct sock *sk) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *skb; - u16 control; - int err; - - while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { - control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; - err = l2cap_ertm_reassembly_sdu(sk, skb, control); - if (err < 0) { - skb_queue_head(BUSY_QUEUE(sk), skb); - return -EBUSY; - } - - pi->buffer_seq = (pi->buffer_seq + 1) % 64; - } - - if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) - goto done; - - control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; - control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; - l2cap_send_sframe(pi, control); - l2cap_pi(sk)->retry_count = 1; - - del_timer(&pi->retrans_timer); - __mod_monitor_timer(); - - l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; - -done: - pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; - pi->conn_state &= ~L2CAP_CONN_RNR_SENT; - - BT_DBG("sk %p, Exit local busy", sk); - - return 0; -} - -static void l2cap_busy_work(struct work_struct *work) -{ - DECLARE_WAITQUEUE(wait, current); - struct l2cap_pinfo *pi = - container_of(work, struct l2cap_pinfo, busy_work); - struct sock *sk = (struct sock *)pi; - int n_tries = 0, timeo = HZ/5, err; - struct sk_buff *skb; - - lock_sock(sk); - - add_wait_queue(sk_sleep(sk), &wait); - while ((skb = skb_peek(BUSY_QUEUE(sk)))) { - set_current_state(TASK_INTERRUPTIBLE); - - if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { - err = -EBUSY; - l2cap_send_disconn_req(pi->conn, sk, EBUSY); - break; - } - - if (!timeo) - timeo = HZ/5; - - if (signal_pending(current)) { - err = sock_intr_errno(timeo); - break; - } - - release_sock(sk); - timeo = schedule_timeout(timeo); - lock_sock(sk); - - err = sock_error(sk); - if (err) - break; - - if (l2cap_try_push_rx_skb(sk) == 0) - break; - } - - set_current_state(TASK_RUNNING); - remove_wait_queue(sk_sleep(sk), &wait); - - release_sock(sk); -} - -static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - int sctrl, err; - - if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { - bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; - __skb_queue_tail(BUSY_QUEUE(sk), skb); - return l2cap_try_push_rx_skb(sk); - - - } - - err = l2cap_ertm_reassembly_sdu(sk, skb, control); - if (err >= 0) { - pi->buffer_seq = (pi->buffer_seq + 1) % 64; - return err; - } - - /* Busy Condition */ - BT_DBG("sk %p, Enter local busy", sk); - - pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; - bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; - __skb_queue_tail(BUSY_QUEUE(sk), skb); - - sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; - sctrl |= L2CAP_SUPER_RCV_NOT_READY; - l2cap_send_sframe(pi, sctrl); - - pi->conn_state |= L2CAP_CONN_RNR_SENT; - - del_timer(&pi->ack_timer); - - queue_work(_busy_wq, &pi->busy_work); - - return err; -} - -static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *_skb; - int err = -EINVAL; - - /* - * TODO: We have to notify the userland if some data is lost with the - * Streaming Mode. - */ - - switch (control & L2CAP_CTRL_SAR) { - case L2CAP_SDU_UNSEGMENTED: - if (pi->conn_state & L2CAP_CONN_SAR_SDU) { - kfree_skb(pi->sdu); - break; - } - - err = sock_queue_rcv_skb(sk, skb); - if (!err) - return 0; - - break; - - case L2CAP_SDU_START: - if (pi->conn_state & L2CAP_CONN_SAR_SDU) { - kfree_skb(pi->sdu); - break; - } - - pi->sdu_len = get_unaligned_le16(skb->data); - skb_pull(skb, 2); - - if (pi->sdu_len > pi->imtu) { - err = -EMSGSIZE; - break; - } - - pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); - if (!pi->sdu) { - err = -ENOMEM; - break; - } - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - - pi->conn_state |= L2CAP_CONN_SAR_SDU; - pi->partial_sdu_len = skb->len; - err = 0; - break; - - case L2CAP_SDU_CONTINUE: - if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) - break; - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - - pi->partial_sdu_len += skb->len; - if (pi->partial_sdu_len > pi->sdu_len) - kfree_skb(pi->sdu); - else - err = 0; - - break; - - case L2CAP_SDU_END: - if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) - break; - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - - pi->conn_state &= ~L2CAP_CONN_SAR_SDU; - pi->partial_sdu_len += skb->len; - - if (pi->partial_sdu_len > pi->imtu) - goto drop; - - if (pi->partial_sdu_len == pi->sdu_len) { - _skb = skb_clone(pi->sdu, GFP_ATOMIC); - err = sock_queue_rcv_skb(sk, _skb); - if (err < 0) - kfree_skb(_skb); - } - err = 0; - -drop: - kfree_skb(pi->sdu); - break; - } - - kfree_skb(skb); - return err; -} - -static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) -{ - struct sk_buff *skb; - u16 control; - - while ((skb = skb_peek(SREJ_QUEUE(sk)))) { - if (bt_cb(skb)->tx_seq != tx_seq) - break; - - skb = skb_dequeue(SREJ_QUEUE(sk)); - control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; - l2cap_ertm_reassembly_sdu(sk, skb, control); - l2cap_pi(sk)->buffer_seq_srej = - (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; - tx_seq = (tx_seq + 1) % 64; - } -} - -static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct srej_list *l, *tmp; - u16 control; - - list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { - if (l->tx_seq == tx_seq) { - list_del(&l->list); - kfree(l); - return; - } - control = L2CAP_SUPER_SELECT_REJECT; - control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; - l2cap_send_sframe(pi, control); - list_del(&l->list); - list_add_tail(&l->list, SREJ_LIST(sk)); - } -} - -static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct srej_list *new; - u16 control; - - while (tx_seq != pi->expected_tx_seq) { - control = L2CAP_SUPER_SELECT_REJECT; - control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; - l2cap_send_sframe(pi, control); - - new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); - new->tx_seq = pi->expected_tx_seq; - pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; - list_add_tail(&new->list, SREJ_LIST(sk)); - } - pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; -} - -static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u8 tx_seq = __get_txseq(rx_control); - u8 req_seq = __get_reqseq(rx_control); - u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; - int tx_seq_offset, expected_tx_seq_offset; - int num_to_ack = (pi->tx_win/6) + 1; - int err = 0; - - BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, - rx_control); - - if (L2CAP_CTRL_FINAL & rx_control && - l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { - del_timer(&pi->monitor_timer); - if (pi->unacked_frames > 0) - __mod_retrans_timer(); - pi->conn_state &= ~L2CAP_CONN_WAIT_F; - } - - pi->expected_ack_seq = req_seq; - l2cap_drop_acked_frames(sk); - - if (tx_seq == pi->expected_tx_seq) - goto expected; - - tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; - if (tx_seq_offset < 0) - tx_seq_offset += 64; - - /* invalid tx_seq */ - if (tx_seq_offset >= pi->tx_win) { - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - goto drop; - } - - if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) - goto drop; - - if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { - struct srej_list *first; - - first = list_first_entry(SREJ_LIST(sk), - struct srej_list, list); - if (tx_seq == first->tx_seq) { - l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); - l2cap_check_srej_gap(sk, tx_seq); - - list_del(&first->list); - kfree(first); - - if (list_empty(SREJ_LIST(sk))) { - pi->buffer_seq = pi->buffer_seq_srej; - pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; - l2cap_send_ack(pi); - BT_DBG("sk %p, Exit SREJ_SENT", sk); - } - } else { - struct srej_list *l; - - /* duplicated tx_seq */ - if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) - goto drop; - - list_for_each_entry(l, SREJ_LIST(sk), list) { - if (l->tx_seq == tx_seq) { - l2cap_resend_srejframe(sk, tx_seq); - return 0; - } - } - l2cap_send_srejframe(sk, tx_seq); - } - } else { - expected_tx_seq_offset = - (pi->expected_tx_seq - pi->buffer_seq) % 64; - if (expected_tx_seq_offset < 0) - expected_tx_seq_offset += 64; - - /* duplicated tx_seq */ - if (tx_seq_offset < expected_tx_seq_offset) - goto drop; - - pi->conn_state |= L2CAP_CONN_SREJ_SENT; - - BT_DBG("sk %p, Enter SREJ", sk); - - INIT_LIST_HEAD(SREJ_LIST(sk)); - pi->buffer_seq_srej = pi->buffer_seq; - - __skb_queue_head_init(SREJ_QUEUE(sk)); - __skb_queue_head_init(BUSY_QUEUE(sk)); - l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); - - pi->conn_state |= L2CAP_CONN_SEND_PBIT; - - l2cap_send_srejframe(sk, tx_seq); - - del_timer(&pi->ack_timer); - } - return 0; - -expected: - pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; - - if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { - bt_cb(skb)->tx_seq = tx_seq; - bt_cb(skb)->sar = sar; - __skb_queue_tail(SREJ_QUEUE(sk), skb); - return 0; - } - - err = l2cap_push_rx_skb(sk, skb, rx_control); - if (err < 0) - return 0; - - if (rx_control & L2CAP_CTRL_FINAL) { - if (pi->conn_state & L2CAP_CONN_REJ_ACT) - pi->conn_state &= ~L2CAP_CONN_REJ_ACT; - else - l2cap_retransmit_frames(sk); - } - - __mod_ack_timer(); - - pi->num_acked = (pi->num_acked + 1) % num_to_ack; - if (pi->num_acked == num_to_ack - 1) - l2cap_send_ack(pi); - - return 0; - -drop: - kfree_skb(skb); - return 0; -} - -static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - - BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), - rx_control); - - pi->expected_ack_seq = __get_reqseq(rx_control); - l2cap_drop_acked_frames(sk); - - if (rx_control & L2CAP_CTRL_POLL) { - pi->conn_state |= L2CAP_CONN_SEND_FBIT; - if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { - if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && - (pi->unacked_frames > 0)) - __mod_retrans_timer(); - - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - l2cap_send_srejtail(sk); - } else { - l2cap_send_i_or_rr_or_rnr(sk); - } - - } else if (rx_control & L2CAP_CTRL_FINAL) { - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - - if (pi->conn_state & L2CAP_CONN_REJ_ACT) - pi->conn_state &= ~L2CAP_CONN_REJ_ACT; - else - l2cap_retransmit_frames(sk); - - } else { - if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && - (pi->unacked_frames > 0)) - __mod_retrans_timer(); - - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { - l2cap_send_ack(pi); - } else { - l2cap_ertm_send(sk); - } - } -} - -static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u8 tx_seq = __get_reqseq(rx_control); - - BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); - - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - - pi->expected_ack_seq = tx_seq; - l2cap_drop_acked_frames(sk); - - if (rx_control & L2CAP_CTRL_FINAL) { - if (pi->conn_state & L2CAP_CONN_REJ_ACT) - pi->conn_state &= ~L2CAP_CONN_REJ_ACT; - else - l2cap_retransmit_frames(sk); - } else { - l2cap_retransmit_frames(sk); - - if (pi->conn_state & L2CAP_CONN_WAIT_F) - pi->conn_state |= L2CAP_CONN_REJ_ACT; - } -} -static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u8 tx_seq = __get_reqseq(rx_control); - - BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); - - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - - if (rx_control & L2CAP_CTRL_POLL) { - pi->expected_ack_seq = tx_seq; - l2cap_drop_acked_frames(sk); - - pi->conn_state |= L2CAP_CONN_SEND_FBIT; - l2cap_retransmit_one_frame(sk, tx_seq); - - l2cap_ertm_send(sk); - - if (pi->conn_state & L2CAP_CONN_WAIT_F) { - pi->srej_save_reqseq = tx_seq; - pi->conn_state |= L2CAP_CONN_SREJ_ACT; - } - } else if (rx_control & L2CAP_CTRL_FINAL) { - if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && - pi->srej_save_reqseq == tx_seq) - pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; - else - l2cap_retransmit_one_frame(sk, tx_seq); - } else { - l2cap_retransmit_one_frame(sk, tx_seq); - if (pi->conn_state & L2CAP_CONN_WAIT_F) { - pi->srej_save_reqseq = tx_seq; - pi->conn_state |= L2CAP_CONN_SREJ_ACT; - } - } -} - -static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u8 tx_seq = __get_reqseq(rx_control); - - BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); - - pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; - pi->expected_ack_seq = tx_seq; - l2cap_drop_acked_frames(sk); - - if (rx_control & L2CAP_CTRL_POLL) - pi->conn_state |= L2CAP_CONN_SEND_FBIT; - - if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { - del_timer(&pi->retrans_timer); - if (rx_control & L2CAP_CTRL_POLL) - l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); - return; - } - - if (rx_control & L2CAP_CTRL_POLL) - l2cap_send_srejtail(sk); - else - l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); -} - -static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) -{ - BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); - - if (L2CAP_CTRL_FINAL & rx_control && - l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { - del_timer(&l2cap_pi(sk)->monitor_timer); - if (l2cap_pi(sk)->unacked_frames > 0) - __mod_retrans_timer(); - l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; - } - - switch (rx_control & L2CAP_CTRL_SUPERVISE) { - case L2CAP_SUPER_RCV_READY: - l2cap_data_channel_rrframe(sk, rx_control); - break; - - case L2CAP_SUPER_REJECT: - l2cap_data_channel_rejframe(sk, rx_control); - break; - - case L2CAP_SUPER_SELECT_REJECT: - l2cap_data_channel_srejframe(sk, rx_control); - break; - - case L2CAP_SUPER_RCV_NOT_READY: - l2cap_data_channel_rnrframe(sk, rx_control); - break; - } - - kfree_skb(skb); - return 0; -} - -static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u16 control; - u8 req_seq; - int len, next_tx_seq_offset, req_seq_offset; - - control = get_unaligned_le16(skb->data); - skb_pull(skb, 2); - len = skb->len; - - /* - * We can just drop the corrupted I-frame here. - * Receiver will miss it and start proper recovery - * procedures and ask retransmission. - */ - if (l2cap_check_fcs(pi, skb)) - goto drop; - - if (__is_sar_start(control) && __is_iframe(control)) - len -= 2; - - if (pi->fcs == L2CAP_FCS_CRC16) - len -= 2; - - if (len > pi->mps) { - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - goto drop; - } - - req_seq = __get_reqseq(control); - req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; - if (req_seq_offset < 0) - req_seq_offset += 64; - - next_tx_seq_offset = - (pi->next_tx_seq - pi->expected_ack_seq) % 64; - if (next_tx_seq_offset < 0) - next_tx_seq_offset += 64; - - /* check for invalid req-seq */ - if (req_seq_offset > next_tx_seq_offset) { - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - goto drop; - } - - if (__is_iframe(control)) { - if (len < 0) { - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - goto drop; - } - - l2cap_data_channel_iframe(sk, control, skb); - } else { - if (len != 0) { - BT_ERR("%d", len); - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - goto drop; - } - - l2cap_data_channel_sframe(sk, control, skb); - } - - return 0; - -drop: - kfree_skb(skb); - return 0; -} - -static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) -{ - struct sock *sk; - struct l2cap_pinfo *pi; - u16 control; - u8 tx_seq; - int len; - - sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); - if (!sk) { - BT_DBG("unknown cid 0x%4.4x", cid); - goto drop; - } - - pi = l2cap_pi(sk); - - BT_DBG("sk %p, len %d", sk, skb->len); - - if (sk->sk_state != BT_CONNECTED) - goto drop; - - switch (pi->mode) { - case L2CAP_MODE_BASIC: - /* If socket recv buffers overflows we drop data here - * which is *bad* because L2CAP has to be reliable. - * But we don't have any other choice. L2CAP doesn't - * provide flow control mechanism. */ - - if (pi->imtu < skb->len) - goto drop; - - if (!sock_queue_rcv_skb(sk, skb)) - goto done; - break; - - case L2CAP_MODE_ERTM: - if (!sock_owned_by_user(sk)) { - l2cap_ertm_data_rcv(sk, skb); - } else { - if (sk_add_backlog(sk, skb)) - goto drop; - } - - goto done; - - case L2CAP_MODE_STREAMING: - control = get_unaligned_le16(skb->data); - skb_pull(skb, 2); - len = skb->len; - - if (l2cap_check_fcs(pi, skb)) - goto drop; - - if (__is_sar_start(control)) - len -= 2; - - if (pi->fcs == L2CAP_FCS_CRC16) - len -= 2; - - if (len > pi->mps || len < 0 || __is_sframe(control)) - goto drop; - - tx_seq = __get_txseq(control); - - if (pi->expected_tx_seq == tx_seq) - pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; - else - pi->expected_tx_seq = (tx_seq + 1) % 64; - - l2cap_streaming_reassembly_sdu(sk, skb, control); - - goto done; - - default: - BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); - break; - } - -drop: - kfree_skb(skb); - -done: - if (sk) - bh_unlock_sock(sk); - - return 0; -} - -static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) -{ - struct sock *sk; - - sk = l2cap_get_sock_by_psm(0, psm, conn->src); - if (!sk) - goto drop; - - BT_DBG("sk %p, len %d", sk, skb->len); - - if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) - goto drop; - - if (l2cap_pi(sk)->imtu < skb->len) - goto drop; - - if (!sock_queue_rcv_skb(sk, skb)) - goto done; - -drop: - kfree_skb(skb); - -done: - if (sk) - bh_unlock_sock(sk); - return 0; -} - -static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) -{ - struct l2cap_hdr *lh = (void *) skb->data; - u16 cid, len; - __le16 psm; - - skb_pull(skb, L2CAP_HDR_SIZE); - cid = __le16_to_cpu(lh->cid); - len = __le16_to_cpu(lh->len); - - if (len != skb->len) { - kfree_skb(skb); - return; - } - - BT_DBG("len %d, cid 0x%4.4x", len, cid); - - switch (cid) { - case L2CAP_CID_SIGNALING: - l2cap_sig_channel(conn, skb); - break; - - case L2CAP_CID_CONN_LESS: - psm = get_unaligned_le16(skb->data); - skb_pull(skb, 2); - l2cap_conless_channel(conn, psm, skb); - break; - - default: - l2cap_data_channel(conn, cid, skb); - break; - } -} - -/* ---- L2CAP interface with lower layer (HCI) ---- */ - -static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) -{ - int exact = 0, lm1 = 0, lm2 = 0; - register struct sock *sk; - struct hlist_node *node; - - if (type != ACL_LINK) - return -EINVAL; - - BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); - - /* Find listening sockets and check their link_mode */ - read_lock(&l2cap_sk_list.lock); - sk_for_each(sk, node, &l2cap_sk_list.head) { - if (sk->sk_state != BT_LISTEN) - continue; - - if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { - lm1 |= HCI_LM_ACCEPT; - if (l2cap_pi(sk)->role_switch) - lm1 |= HCI_LM_MASTER; - exact++; - } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { - lm2 |= HCI_LM_ACCEPT; - if (l2cap_pi(sk)->role_switch) - lm2 |= HCI_LM_MASTER; - } - } - read_unlock(&l2cap_sk_list.lock); - - return exact ? lm1 : lm2; -} - -static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) -{ - struct l2cap_conn *conn; - - BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); - - if (hcon->type != ACL_LINK) - return -EINVAL; - - if (!status) { - conn = l2cap_conn_add(hcon, status); - if (conn) - l2cap_conn_ready(conn); - } else - l2cap_conn_del(hcon, bt_err(status)); - - return 0; -} - -static int l2cap_disconn_ind(struct hci_conn *hcon) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - - BT_DBG("hcon %p", hcon); - - if (hcon->type != ACL_LINK || !conn) - return 0x13; - - return conn->disc_reason; -} - -static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) -{ - BT_DBG("hcon %p reason %d", hcon, reason); - - if (hcon->type != ACL_LINK) - return -EINVAL; - - l2cap_conn_del(hcon, bt_err(reason)); - - return 0; -} - -static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) -{ - if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) - return; - - if (encrypt == 0x00) { - if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { - l2cap_sock_clear_timer(sk); - l2cap_sock_set_timer(sk, HZ * 5); - } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) - __l2cap_sock_close(sk, ECONNREFUSED); - } else { - if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) - l2cap_sock_clear_timer(sk); - } -} - -static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) -{ - struct l2cap_chan_list *l; - struct l2cap_conn *conn = hcon->l2cap_data; - struct sock *sk; - - if (!conn) - return 0; - - l = &conn->chan_list; - - BT_DBG("conn %p", conn); - - read_lock(&l->lock); - - for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - bh_lock_sock(sk); - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { - bh_unlock_sock(sk); - continue; - } - - if (!status && (sk->sk_state == BT_CONNECTED || - sk->sk_state == BT_CONFIG)) { - l2cap_check_encryption(sk, encrypt); - bh_unlock_sock(sk); - continue; - } - - if (sk->sk_state == BT_CONNECT) { - if (!status) { - struct l2cap_conn_req req; - req.scid = cpu_to_le16(l2cap_pi(sk)->scid); - req.psm = l2cap_pi(sk)->psm; - - l2cap_pi(sk)->ident = l2cap_get_ident(conn); - l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; - - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_REQ, sizeof(req), &req); - } else { - l2cap_sock_clear_timer(sk); - l2cap_sock_set_timer(sk, HZ / 10); - } - } else if (sk->sk_state == BT_CONNECT2) { - struct l2cap_conn_rsp rsp; - __u16 result; - - if (!status) { - sk->sk_state = BT_CONFIG; - result = L2CAP_CR_SUCCESS; - } else { - sk->sk_state = BT_DISCONN; - l2cap_sock_set_timer(sk, HZ / 10); - result = L2CAP_CR_SEC_BLOCK; - } - - rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); - rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); - rsp.result = cpu_to_le16(result); - rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_RSP, sizeof(rsp), &rsp); - } - - bh_unlock_sock(sk); - } - - read_unlock(&l->lock); - - return 0; -} - -static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - - if (!conn && !(conn = l2cap_conn_add(hcon, 0))) - goto drop; - - BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); - - if (flags & ACL_START) { - struct l2cap_hdr *hdr; - int len; - - if (conn->rx_len) { - BT_ERR("Unexpected start frame (len %d)", skb->len); - kfree_skb(conn->rx_skb); - conn->rx_skb = NULL; - conn->rx_len = 0; - l2cap_conn_unreliable(conn, ECOMM); - } - - if (skb->len < 2) { - BT_ERR("Frame is too short (len %d)", skb->len); - l2cap_conn_unreliable(conn, ECOMM); - goto drop; - } - - hdr = (struct l2cap_hdr *) skb->data; - len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; - - if (len == skb->len) { - /* Complete frame received */ - l2cap_recv_frame(conn, skb); - return 0; - } - - BT_DBG("Start: total len %d, frag len %d", len, skb->len); - - if (skb->len > len) { - BT_ERR("Frame is too long (len %d, expected len %d)", - skb->len, len); - l2cap_conn_unreliable(conn, ECOMM); - goto drop; - } - - /* Allocate skb for the complete frame (with header) */ - conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); - if (!conn->rx_skb) - goto drop; - - skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), - skb->len); - conn->rx_len = len - skb->len; - } else { - BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); - - if (!conn->rx_len) { - BT_ERR("Unexpected continuation frame (len %d)", skb->len); - l2cap_conn_unreliable(conn, ECOMM); - goto drop; - } - - if (skb->len > conn->rx_len) { - BT_ERR("Fragment is too long (len %d, expected %d)", - skb->len, conn->rx_len); - kfree_skb(conn->rx_skb); - conn->rx_skb = NULL; - conn->rx_len = 0; - l2cap_conn_unreliable(conn, ECOMM); - goto drop; - } - - skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), - skb->len); - conn->rx_len -= skb->len; - - if (!conn->rx_len) { - /* Complete frame received */ - l2cap_recv_frame(conn, conn->rx_skb); - conn->rx_skb = NULL; - } - } - -drop: - kfree_skb(skb); - return 0; -} - -static int l2cap_debugfs_show(struct seq_file *f, void *p) -{ - struct sock *sk; - struct hlist_node *node; - - read_lock_bh(&l2cap_sk_list.lock); - - sk_for_each(sk, node, &l2cap_sk_list.head) { - struct l2cap_pinfo *pi = l2cap_pi(sk); - - seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", - batostr(&bt_sk(sk)->src), - batostr(&bt_sk(sk)->dst), - sk->sk_state, __le16_to_cpu(pi->psm), - pi->scid, pi->dcid, - pi->imtu, pi->omtu, pi->sec_level); - } - - read_unlock_bh(&l2cap_sk_list.lock); - - return 0; -} - -static int l2cap_debugfs_open(struct inode *inode, struct file *file) -{ - return single_open(file, l2cap_debugfs_show, inode->i_private); -} - -static const struct file_operations l2cap_debugfs_fops = { - .open = l2cap_debugfs_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -static struct dentry *l2cap_debugfs; - -static const struct proto_ops l2cap_sock_ops = { - .family = PF_BLUETOOTH, - .owner = THIS_MODULE, - .release = l2cap_sock_release, - .bind = l2cap_sock_bind, - .connect = l2cap_sock_connect, - .listen = l2cap_sock_listen, - .accept = l2cap_sock_accept, - .getname = l2cap_sock_getname, - .sendmsg = l2cap_sock_sendmsg, - .recvmsg = l2cap_sock_recvmsg, - .poll = bt_sock_poll, - .ioctl = bt_sock_ioctl, - .mmap = sock_no_mmap, - .socketpair = sock_no_socketpair, - .shutdown = l2cap_sock_shutdown, - .setsockopt = l2cap_sock_setsockopt, - .getsockopt = l2cap_sock_getsockopt -}; - -static const struct net_proto_family l2cap_sock_family_ops = { - .family = PF_BLUETOOTH, - .owner = THIS_MODULE, - .create = l2cap_sock_create, -}; - -static struct hci_proto l2cap_hci_proto = { - .name = "L2CAP", - .id = HCI_PROTO_L2CAP, - .connect_ind = l2cap_connect_ind, - .connect_cfm = l2cap_connect_cfm, - .disconn_ind = l2cap_disconn_ind, - .disconn_cfm = l2cap_disconn_cfm, - .security_cfm = l2cap_security_cfm, - .recv_acldata = l2cap_recv_acldata -}; - -static int __init l2cap_init(void) -{ - int err; - - err = proto_register(&l2cap_proto, 0); - if (err < 0) - return err; - - _busy_wq = create_singlethread_workqueue("l2cap"); - if (!_busy_wq) - goto error; - - err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); - if (err < 0) { - BT_ERR("L2CAP socket registration failed"); - goto error; - } - - err = hci_register_proto(&l2cap_hci_proto); - if (err < 0) { - BT_ERR("L2CAP protocol registration failed"); - bt_sock_unregister(BTPROTO_L2CAP); - goto error; - } - - if (bt_debugfs) { - l2cap_debugfs = debugfs_create_file("l2cap", 0444, - bt_debugfs, NULL, &l2cap_debugfs_fops); - if (!l2cap_debugfs) - BT_ERR("Failed to create L2CAP debug file"); - } - - BT_INFO("L2CAP ver %s", VERSION); - BT_INFO("L2CAP socket layer initialized"); - - return 0; - -error: - proto_unregister(&l2cap_proto); - return err; -} - -static void __exit l2cap_exit(void) -{ - debugfs_remove(l2cap_debugfs); - - flush_workqueue(_busy_wq); - destroy_workqueue(_busy_wq); - - if (bt_sock_unregister(BTPROTO_L2CAP) < 0) - BT_ERR("L2CAP socket unregistration failed"); - - if (hci_unregister_proto(&l2cap_hci_proto) < 0) - BT_ERR("L2CAP protocol unregistration failed"); - - proto_unregister(&l2cap_proto); -} - -void l2cap_load(void) -{ - /* Dummy function to trigger automatic L2CAP module loading by - * other modules that use L2CAP sockets but don't use any other - * symbols from it. */ -} -EXPORT_SYMBOL(l2cap_load); - -module_init(l2cap_init); -module_exit(l2cap_exit); - -module_param(enable_ertm, bool, 0644); -MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); - -MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); -MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); -MODULE_VERSION(VERSION); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("bt-proto-0"); diff --git a/net/bluetooth/l2cap/Makefile b/net/bluetooth/l2cap/Makefile new file mode 100644 index 0000000..20c88d2 --- /dev/null +++ b/net/bluetooth/l2cap/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for the Linux Bluetooth L2CAP layer. +# + +obj-$(CONFIG_BT_RFCOMM) += l2cap.o diff --git a/net/bluetooth/l2cap/l2cap.c b/net/bluetooth/l2cap/l2cap.c new file mode 100644 index 0000000..cdd608d --- /dev/null +++ b/net/bluetooth/l2cap/l2cap.c @@ -0,0 +1,4859 @@ +/* + BlueZ - Bluetooth protocol stack for Linux + Copyright (C) 2000-2001 Qualcomm Incorporated + Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> + + Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as + published by the Free Software Foundation; + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. + IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY + CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + + ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, + COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS + SOFTWARE IS DISCLAIMED. +*/ + +/* Bluetooth L2CAP core and sockets. */ + +#include <linux/module.h> + +#include <linux/types.h> +#include <linux/capability.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/poll.h> +#include <linux/fcntl.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/socket.h> +#include <linux/skbuff.h> +#include <linux/list.h> +#include <linux/device.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> +#include <linux/crc16.h> +#include <net/sock.h> + +#include <asm/system.h> +#include <asm/unaligned.h> + +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci_core.h> +#include <net/bluetooth/l2cap.h> + +#define VERSION "2.15" + +static int enable_ertm = 0; + +static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; +static u8 l2cap_fixed_chan[8] = { 0x02, }; + +static const struct proto_ops l2cap_sock_ops; + +static struct workqueue_struct *_busy_wq; + +static struct bt_sock_list l2cap_sk_list = { + .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) +}; + +static void l2cap_busy_work(struct work_struct *work); + +static void __l2cap_sock_close(struct sock *sk, int reason); +static void l2cap_sock_close(struct sock *sk); +static void l2cap_sock_kill(struct sock *sk); + +static int l2cap_build_conf_req(struct sock *sk, void *data); +static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, + u8 code, u8 ident, u16 dlen, void *data); + +static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); + +/* ---- L2CAP timers ---- */ +static void l2cap_sock_timeout(unsigned long arg) +{ + struct sock *sk = (struct sock *) arg; + int reason; + + BT_DBG("sock %p state %d", sk, sk->sk_state); + + bh_lock_sock(sk); + + if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) + reason = ECONNREFUSED; + else if (sk->sk_state == BT_CONNECT && + l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) + reason = ECONNREFUSED; + else + reason = ETIMEDOUT; + + __l2cap_sock_close(sk, reason); + + bh_unlock_sock(sk); + + l2cap_sock_kill(sk); + sock_put(sk); +} + +static void l2cap_sock_set_timer(struct sock *sk, long timeout) +{ + BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); + sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); +} + +static void l2cap_sock_clear_timer(struct sock *sk) +{ + BT_DBG("sock %p state %d", sk, sk->sk_state); + sk_stop_timer(sk, &sk->sk_timer); +} + +/* ---- L2CAP channels ---- */ +static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) +{ + struct sock *s; + for (s = l->head; s; s = l2cap_pi(s)->next_c) { + if (l2cap_pi(s)->dcid == cid) + break; + } + return s; +} + +static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) +{ + struct sock *s; + for (s = l->head; s; s = l2cap_pi(s)->next_c) { + if (l2cap_pi(s)->scid == cid) + break; + } + return s; +} + +/* Find channel with given SCID. + * Returns locked socket */ +static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) +{ + struct sock *s; + read_lock(&l->lock); + s = __l2cap_get_chan_by_scid(l, cid); + if (s) + bh_lock_sock(s); + read_unlock(&l->lock); + return s; +} + +static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) +{ + struct sock *s; + for (s = l->head; s; s = l2cap_pi(s)->next_c) { + if (l2cap_pi(s)->ident == ident) + break; + } + return s; +} + +static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) +{ + struct sock *s; + read_lock(&l->lock); + s = __l2cap_get_chan_by_ident(l, ident); + if (s) + bh_lock_sock(s); + read_unlock(&l->lock); + return s; +} + +static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) +{ + u16 cid = L2CAP_CID_DYN_START; + + for (; cid < L2CAP_CID_DYN_END; cid++) { + if (!__l2cap_get_chan_by_scid(l, cid)) + return cid; + } + + return 0; +} + +static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) +{ + sock_hold(sk); + + if (l->head) + l2cap_pi(l->head)->prev_c = sk; + + l2cap_pi(sk)->next_c = l->head; + l2cap_pi(sk)->prev_c = NULL; + l->head = sk; +} + +static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) +{ + struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; + + write_lock_bh(&l->lock); + if (sk == l->head) + l->head = next; + + if (next) + l2cap_pi(next)->prev_c = prev; + if (prev) + l2cap_pi(prev)->next_c = next; + write_unlock_bh(&l->lock); + + __sock_put(sk); +} + +static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) +{ + struct l2cap_chan_list *l = &conn->chan_list; + + BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, + l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); + + conn->disc_reason = 0x13; + + l2cap_pi(sk)->conn = conn; + + if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { + /* Alloc CID for connection-oriented socket */ + l2cap_pi(sk)->scid = l2cap_alloc_cid(l); + } else if (sk->sk_type == SOCK_DGRAM) { + /* Connectionless socket */ + l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; + l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; + l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; + } else { + /* Raw socket can send/recv signalling messages only */ + l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; + l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; + l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; + } + + __l2cap_chan_link(l, sk); + + if (parent) + bt_accept_enqueue(parent, sk); +} + +/* Delete channel. + * Must be called on the locked socket. */ +static void l2cap_chan_del(struct sock *sk, int err) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct sock *parent = bt_sk(sk)->parent; + + l2cap_sock_clear_timer(sk); + + BT_DBG("sk %p, conn %p, err %d", sk, conn, err); + + if (conn) { + /* Unlink from channel list */ + l2cap_chan_unlink(&conn->chan_list, sk); + l2cap_pi(sk)->conn = NULL; + hci_conn_put(conn->hcon); + } + + sk->sk_state = BT_CLOSED; + sock_set_flag(sk, SOCK_ZAPPED); + + if (err) + sk->sk_err = err; + + if (parent) { + bt_accept_unlink(sk); + parent->sk_data_ready(parent, 0); + } else + sk->sk_state_change(sk); + + skb_queue_purge(TX_QUEUE(sk)); + + if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { + struct srej_list *l, *tmp; + + del_timer(&l2cap_pi(sk)->retrans_timer); + del_timer(&l2cap_pi(sk)->monitor_timer); + del_timer(&l2cap_pi(sk)->ack_timer); + + skb_queue_purge(SREJ_QUEUE(sk)); + skb_queue_purge(BUSY_QUEUE(sk)); + + list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { + list_del(&l->list); + kfree(l); + } + } +} + +/* Service level security */ +static inline int l2cap_check_security(struct sock *sk) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + __u8 auth_type; + + if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { + if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) + auth_type = HCI_AT_NO_BONDING_MITM; + else + auth_type = HCI_AT_NO_BONDING; + + if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) + l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; + } else { + switch (l2cap_pi(sk)->sec_level) { + case BT_SECURITY_HIGH: + auth_type = HCI_AT_GENERAL_BONDING_MITM; + break; + case BT_SECURITY_MEDIUM: + auth_type = HCI_AT_GENERAL_BONDING; + break; + default: + auth_type = HCI_AT_NO_BONDING; + break; + } + } + + return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, + auth_type); +} + +static inline u8 l2cap_get_ident(struct l2cap_conn *conn) +{ + u8 id; + + /* Get next available identificator. + * 1 - 128 are used by kernel. + * 129 - 199 are reserved. + * 200 - 254 are used by utilities like l2ping, etc. + */ + + spin_lock_bh(&conn->lock); + + if (++conn->tx_ident > 128) + conn->tx_ident = 1; + + id = conn->tx_ident; + + spin_unlock_bh(&conn->lock); + + return id; +} + +static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) +{ + struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); + + BT_DBG("code 0x%2.2x", code); + + if (!skb) + return; + + hci_send_acl(conn->hcon, skb, 0); +} + +static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) +{ + struct sk_buff *skb; + struct l2cap_hdr *lh; + struct l2cap_conn *conn = pi->conn; + struct sock *sk = (struct sock *)pi; + int count, hlen = L2CAP_HDR_SIZE + 2; + + if (sk->sk_state != BT_CONNECTED) + return; + + if (pi->fcs == L2CAP_FCS_CRC16) + hlen += 2; + + BT_DBG("pi %p, control 0x%2.2x", pi, control); + + count = min_t(unsigned int, conn->mtu, hlen); + control |= L2CAP_CTRL_FRAME_TYPE; + + if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { + control |= L2CAP_CTRL_FINAL; + pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; + } + + if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { + control |= L2CAP_CTRL_POLL; + pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; + } + + skb = bt_skb_alloc(count, GFP_ATOMIC); + if (!skb) + return; + + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(pi->dcid); + put_unaligned_le16(control, skb_put(skb, 2)); + + if (pi->fcs == L2CAP_FCS_CRC16) { + u16 fcs = crc16(0, (u8 *)lh, count - 2); + put_unaligned_le16(fcs, skb_put(skb, 2)); + } + + hci_send_acl(pi->conn->hcon, skb, 0); +} + +static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) +{ + if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { + control |= L2CAP_SUPER_RCV_NOT_READY; + pi->conn_state |= L2CAP_CONN_RNR_SENT; + } else + control |= L2CAP_SUPER_RCV_READY; + + control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + l2cap_send_sframe(pi, control); +} + +static inline int __l2cap_no_conn_pending(struct sock *sk) +{ + return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); +} + +static void l2cap_do_start(struct sock *sk) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + + if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { + if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) + return; + + if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { + struct l2cap_conn_req req; + req.scid = cpu_to_le16(l2cap_pi(sk)->scid); + req.psm = l2cap_pi(sk)->psm; + + l2cap_pi(sk)->ident = l2cap_get_ident(conn); + l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; + + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_REQ, sizeof(req), &req); + } + } else { + struct l2cap_info_req req; + req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; + conn->info_ident = l2cap_get_ident(conn); + + mod_timer(&conn->info_timer, jiffies + + msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); + + l2cap_send_cmd(conn, conn->info_ident, + L2CAP_INFO_REQ, sizeof(req), &req); + } +} + +static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) +{ + u32 local_feat_mask = l2cap_feat_mask; + if (enable_ertm) + local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; + + switch (mode) { + case L2CAP_MODE_ERTM: + return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; + case L2CAP_MODE_STREAMING: + return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; + default: + return 0x00; + } +} + +static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) +{ + struct l2cap_disconn_req req; + + if (!conn) + return; + + skb_queue_purge(TX_QUEUE(sk)); + + if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { + del_timer(&l2cap_pi(sk)->retrans_timer); + del_timer(&l2cap_pi(sk)->monitor_timer); + del_timer(&l2cap_pi(sk)->ack_timer); + } + + req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); + req.scid = cpu_to_le16(l2cap_pi(sk)->scid); + l2cap_send_cmd(conn, l2cap_get_ident(conn), + L2CAP_DISCONN_REQ, sizeof(req), &req); + + sk->sk_state = BT_DISCONN; + sk->sk_err = err; +} + +/* ---- L2CAP connections ---- */ +static void l2cap_conn_start(struct l2cap_conn *conn) +{ + struct l2cap_chan_list *l = &conn->chan_list; + struct sock_del_list del, *tmp1, *tmp2; + struct sock *sk; + + BT_DBG("conn %p", conn); + + INIT_LIST_HEAD(&del.list); + + read_lock(&l->lock); + + for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { + bh_lock_sock(sk); + + if (sk->sk_type != SOCK_SEQPACKET && + sk->sk_type != SOCK_STREAM) { + bh_unlock_sock(sk); + continue; + } + + if (sk->sk_state == BT_CONNECT) { + struct l2cap_conn_req req; + + if (!l2cap_check_security(sk) || + !__l2cap_no_conn_pending(sk)) { + bh_unlock_sock(sk); + continue; + } + + if (!l2cap_mode_supported(l2cap_pi(sk)->mode, + conn->feat_mask) + && l2cap_pi(sk)->conf_state & + L2CAP_CONF_STATE2_DEVICE) { + tmp1 = kzalloc(sizeof(struct sock_del_list), + GFP_ATOMIC); + tmp1->sk = sk; + list_add_tail(&tmp1->list, &del.list); + bh_unlock_sock(sk); + continue; + } + + req.scid = cpu_to_le16(l2cap_pi(sk)->scid); + req.psm = l2cap_pi(sk)->psm; + + l2cap_pi(sk)->ident = l2cap_get_ident(conn); + l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; + + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_REQ, sizeof(req), &req); + + } else if (sk->sk_state == BT_CONNECT2) { + struct l2cap_conn_rsp rsp; + char buf[128]; + rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); + rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); + + if (l2cap_check_security(sk)) { + if (bt_sk(sk)->defer_setup) { + struct sock *parent = bt_sk(sk)->parent; + rsp.result = cpu_to_le16(L2CAP_CR_PEND); + rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); + parent->sk_data_ready(parent, 0); + + } else { + sk->sk_state = BT_CONFIG; + rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + } + } else { + rsp.result = cpu_to_le16(L2CAP_CR_PEND); + rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); + } + + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_RSP, sizeof(rsp), &rsp); + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || + rsp.result != L2CAP_CR_SUCCESS) { + bh_unlock_sock(sk); + continue; + } + + l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(sk, buf), buf); + l2cap_pi(sk)->num_conf_req++; + } + + bh_unlock_sock(sk); + } + + read_unlock(&l->lock); + + list_for_each_entry_safe(tmp1, tmp2, &del.list, list) { + bh_lock_sock(tmp1->sk); + __l2cap_sock_close(tmp1->sk, ECONNRESET); + bh_unlock_sock(tmp1->sk); + list_del(&tmp1->list); + kfree(tmp1); + } +} + +static void l2cap_conn_ready(struct l2cap_conn *conn) +{ + struct l2cap_chan_list *l = &conn->chan_list; + struct sock *sk; + + BT_DBG("conn %p", conn); + + read_lock(&l->lock); + + for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { + bh_lock_sock(sk); + + if (sk->sk_type != SOCK_SEQPACKET && + sk->sk_type != SOCK_STREAM) { + l2cap_sock_clear_timer(sk); + sk->sk_state = BT_CONNECTED; + sk->sk_state_change(sk); + } else if (sk->sk_state == BT_CONNECT) + l2cap_do_start(sk); + + bh_unlock_sock(sk); + } + + read_unlock(&l->lock); +} + +/* Notify sockets that we cannot guaranty reliability anymore */ +static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) +{ + struct l2cap_chan_list *l = &conn->chan_list; + struct sock *sk; + + BT_DBG("conn %p", conn); + + read_lock(&l->lock); + + for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { + if (l2cap_pi(sk)->force_reliable) + sk->sk_err = err; + } + + read_unlock(&l->lock); +} + +static void l2cap_info_timeout(unsigned long arg) +{ + struct l2cap_conn *conn = (void *) arg; + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); +} + +static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + + if (conn || status) + return conn; + + conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); + if (!conn) + return NULL; + + hcon->l2cap_data = conn; + conn->hcon = hcon; + + BT_DBG("hcon %p conn %p", hcon, conn); + + conn->mtu = hcon->hdev->acl_mtu; + conn->src = &hcon->hdev->bdaddr; + conn->dst = &hcon->dst; + + conn->feat_mask = 0; + + spin_lock_init(&conn->lock); + rwlock_init(&conn->chan_list.lock); + + setup_timer(&conn->info_timer, l2cap_info_timeout, + (unsigned long) conn); + + conn->disc_reason = 0x13; + + return conn; +} + +static void l2cap_conn_del(struct hci_conn *hcon, int err) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + struct sock *sk; + + if (!conn) + return; + + BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); + + kfree_skb(conn->rx_skb); + + /* Kill channels */ + while ((sk = conn->chan_list.head)) { + bh_lock_sock(sk); + l2cap_chan_del(sk, err); + bh_unlock_sock(sk); + l2cap_sock_kill(sk); + } + + if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) + del_timer_sync(&conn->info_timer); + + hcon->l2cap_data = NULL; + kfree(conn); +} + +static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) +{ + struct l2cap_chan_list *l = &conn->chan_list; + write_lock_bh(&l->lock); + __l2cap_chan_add(conn, sk, parent); + write_unlock_bh(&l->lock); +} + +/* ---- Socket interface ---- */ +static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) +{ + struct sock *sk; + struct hlist_node *node; + sk_for_each(sk, node, &l2cap_sk_list.head) + if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) + goto found; + sk = NULL; +found: + return sk; +} + +/* Find socket with psm and source bdaddr. + * Returns closest match. + */ +static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) +{ + struct sock *sk = NULL, *sk1 = NULL; + struct hlist_node *node; + + sk_for_each(sk, node, &l2cap_sk_list.head) { + if (state && sk->sk_state != state) + continue; + + if (l2cap_pi(sk)->psm == psm) { + /* Exact match. */ + if (!bacmp(&bt_sk(sk)->src, src)) + break; + + /* Closest match */ + if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) + sk1 = sk; + } + } + return node ? sk : sk1; +} + +/* Find socket with given address (psm, src). + * Returns locked socket */ +static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) +{ + struct sock *s; + read_lock(&l2cap_sk_list.lock); + s = __l2cap_get_sock_by_psm(state, psm, src); + if (s) + bh_lock_sock(s); + read_unlock(&l2cap_sk_list.lock); + return s; +} + +static void l2cap_sock_destruct(struct sock *sk) +{ + BT_DBG("sk %p", sk); + + skb_queue_purge(&sk->sk_receive_queue); + skb_queue_purge(&sk->sk_write_queue); +} + +static void l2cap_sock_cleanup_listen(struct sock *parent) +{ + struct sock *sk; + + BT_DBG("parent %p", parent); + + /* Close not yet accepted channels */ + while ((sk = bt_accept_dequeue(parent, NULL))) + l2cap_sock_close(sk); + + parent->sk_state = BT_CLOSED; + sock_set_flag(parent, SOCK_ZAPPED); +} + +/* Kill socket (only if zapped and orphan) + * Must be called on unlocked socket. + */ +static void l2cap_sock_kill(struct sock *sk) +{ + if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) + return; + + BT_DBG("sk %p state %d", sk, sk->sk_state); + + /* Kill poor orphan */ + bt_sock_unlink(&l2cap_sk_list, sk); + sock_set_flag(sk, SOCK_DEAD); + sock_put(sk); +} + +static void __l2cap_sock_close(struct sock *sk, int reason) +{ + BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); + + switch (sk->sk_state) { + case BT_LISTEN: + l2cap_sock_cleanup_listen(sk); + break; + + case BT_CONNECTED: + case BT_CONFIG: + if (sk->sk_type == SOCK_SEQPACKET || + sk->sk_type == SOCK_STREAM) { + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + + l2cap_sock_set_timer(sk, sk->sk_sndtimeo); + l2cap_send_disconn_req(conn, sk, reason); + } else + l2cap_chan_del(sk, reason); + break; + + case BT_CONNECT2: + if (sk->sk_type == SOCK_SEQPACKET || + sk->sk_type == SOCK_STREAM) { + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct l2cap_conn_rsp rsp; + __u16 result; + + if (bt_sk(sk)->defer_setup) + result = L2CAP_CR_SEC_BLOCK; + else + result = L2CAP_CR_BAD_PSM; + + rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); + rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); + rsp.result = cpu_to_le16(result); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_RSP, sizeof(rsp), &rsp); + } else + l2cap_chan_del(sk, reason); + break; + + case BT_CONNECT: + case BT_DISCONN: + l2cap_chan_del(sk, reason); + break; + + default: + sock_set_flag(sk, SOCK_ZAPPED); + break; + } +} + +/* Must be called on unlocked socket. */ +static void l2cap_sock_close(struct sock *sk) +{ + l2cap_sock_clear_timer(sk); + lock_sock(sk); + __l2cap_sock_close(sk, ECONNRESET); + release_sock(sk); + l2cap_sock_kill(sk); +} + +static void l2cap_sock_init(struct sock *sk, struct sock *parent) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + + BT_DBG("sk %p", sk); + + if (parent) { + sk->sk_type = parent->sk_type; + bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; + + pi->imtu = l2cap_pi(parent)->imtu; + pi->omtu = l2cap_pi(parent)->omtu; + pi->conf_state = l2cap_pi(parent)->conf_state; + pi->mode = l2cap_pi(parent)->mode; + pi->fcs = l2cap_pi(parent)->fcs; + pi->max_tx = l2cap_pi(parent)->max_tx; + pi->tx_win = l2cap_pi(parent)->tx_win; + pi->sec_level = l2cap_pi(parent)->sec_level; + pi->role_switch = l2cap_pi(parent)->role_switch; + pi->force_reliable = l2cap_pi(parent)->force_reliable; + } else { + pi->imtu = L2CAP_DEFAULT_MTU; + pi->omtu = 0; + if (enable_ertm && sk->sk_type == SOCK_STREAM) { + pi->mode = L2CAP_MODE_ERTM; + pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; + } else { + pi->mode = L2CAP_MODE_BASIC; + } + pi->max_tx = L2CAP_DEFAULT_MAX_TX; + pi->fcs = L2CAP_FCS_CRC16; + pi->tx_win = L2CAP_DEFAULT_TX_WINDOW; + pi->sec_level = BT_SECURITY_LOW; + pi->role_switch = 0; + pi->force_reliable = 0; + } + + /* Default config options */ + pi->conf_len = 0; + pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; + skb_queue_head_init(TX_QUEUE(sk)); + skb_queue_head_init(SREJ_QUEUE(sk)); + skb_queue_head_init(BUSY_QUEUE(sk)); + INIT_LIST_HEAD(SREJ_LIST(sk)); +} + +static struct proto l2cap_proto = { + .name = "L2CAP", + .owner = THIS_MODULE, + .obj_size = sizeof(struct l2cap_pinfo) +}; + +static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) +{ + struct sock *sk; + + sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); + if (!sk) + return NULL; + + sock_init_data(sock, sk); + INIT_LIST_HEAD(&bt_sk(sk)->accept_q); + + sk->sk_destruct = l2cap_sock_destruct; + sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); + + sock_reset_flag(sk, SOCK_ZAPPED); + + sk->sk_protocol = proto; + sk->sk_state = BT_OPEN; + + setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); + + bt_sock_link(&l2cap_sk_list, sk); + return sk; +} + +static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, + int kern) +{ + struct sock *sk; + + BT_DBG("sock %p", sock); + + sock->state = SS_UNCONNECTED; + + if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && + sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) + return -ESOCKTNOSUPPORT; + + if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) + return -EPERM; + + sock->ops = &l2cap_sock_ops; + + sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); + if (!sk) + return -ENOMEM; + + l2cap_sock_init(sk, NULL); + return 0; +} + +static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) +{ + struct sock *sk = sock->sk; + struct sockaddr_l2 la; + int len, err = 0; + + BT_DBG("sk %p", sk); + + if (!addr || addr->sa_family != AF_BLUETOOTH) + return -EINVAL; + + memset(&la, 0, sizeof(la)); + len = min_t(unsigned int, sizeof(la), alen); + memcpy(&la, addr, len); + + if (la.l2_cid) + return -EINVAL; + + lock_sock(sk); + + if (sk->sk_state != BT_OPEN) { + err = -EBADFD; + goto done; + } + + if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && + !capable(CAP_NET_BIND_SERVICE)) { + err = -EACCES; + goto done; + } + + write_lock_bh(&l2cap_sk_list.lock); + + if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { + err = -EADDRINUSE; + } else { + /* Save source address */ + bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); + l2cap_pi(sk)->psm = la.l2_psm; + l2cap_pi(sk)->sport = la.l2_psm; + sk->sk_state = BT_BOUND; + + if (__le16_to_cpu(la.l2_psm) == 0x0001 || + __le16_to_cpu(la.l2_psm) == 0x0003) + l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; + } + + write_unlock_bh(&l2cap_sk_list.lock); + +done: + release_sock(sk); + return err; +} + +static int l2cap_do_connect(struct sock *sk) +{ + bdaddr_t *src = &bt_sk(sk)->src; + bdaddr_t *dst = &bt_sk(sk)->dst; + struct l2cap_conn *conn; + struct hci_conn *hcon; + struct hci_dev *hdev; + __u8 auth_type; + int err; + + BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), + l2cap_pi(sk)->psm); + + hdev = hci_get_route(dst, src); + if (!hdev) + return -EHOSTUNREACH; + + hci_dev_lock_bh(hdev); + + err = -ENOMEM; + + if (sk->sk_type == SOCK_RAW) { + switch (l2cap_pi(sk)->sec_level) { + case BT_SECURITY_HIGH: + auth_type = HCI_AT_DEDICATED_BONDING_MITM; + break; + case BT_SECURITY_MEDIUM: + auth_type = HCI_AT_DEDICATED_BONDING; + break; + default: + auth_type = HCI_AT_NO_BONDING; + break; + } + } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { + if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) + auth_type = HCI_AT_NO_BONDING_MITM; + else + auth_type = HCI_AT_NO_BONDING; + + if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) + l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; + } else { + switch (l2cap_pi(sk)->sec_level) { + case BT_SECURITY_HIGH: + auth_type = HCI_AT_GENERAL_BONDING_MITM; + break; + case BT_SECURITY_MEDIUM: + auth_type = HCI_AT_GENERAL_BONDING; + break; + default: + auth_type = HCI_AT_NO_BONDING; + break; + } + } + + hcon = hci_connect(hdev, ACL_LINK, dst, + l2cap_pi(sk)->sec_level, auth_type); + if (!hcon) + goto done; + + conn = l2cap_conn_add(hcon, 0); + if (!conn) { + hci_conn_put(hcon); + goto done; + } + + err = 0; + + /* Update source addr of the socket */ + bacpy(src, conn->src); + + l2cap_chan_add(conn, sk, NULL); + + sk->sk_state = BT_CONNECT; + l2cap_sock_set_timer(sk, sk->sk_sndtimeo); + + if (hcon->state == BT_CONNECTED) { + if (sk->sk_type != SOCK_SEQPACKET && + sk->sk_type != SOCK_STREAM) { + l2cap_sock_clear_timer(sk); + sk->sk_state = BT_CONNECTED; + } else + l2cap_do_start(sk); + } + +done: + hci_dev_unlock_bh(hdev); + hci_dev_put(hdev); + return err; +} + +static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) +{ + struct sock *sk = sock->sk; + struct sockaddr_l2 la; + int len, err = 0; + + BT_DBG("sk %p", sk); + + if (!addr || alen < sizeof(addr->sa_family) || + addr->sa_family != AF_BLUETOOTH) + return -EINVAL; + + memset(&la, 0, sizeof(la)); + len = min_t(unsigned int, sizeof(la), alen); + memcpy(&la, addr, len); + + if (la.l2_cid) + return -EINVAL; + + lock_sock(sk); + + if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) + && !la.l2_psm) { + err = -EINVAL; + goto done; + } + + switch (l2cap_pi(sk)->mode) { + case L2CAP_MODE_BASIC: + break; + case L2CAP_MODE_ERTM: + case L2CAP_MODE_STREAMING: + if (enable_ertm) + break; + /* fall through */ + default: + err = -ENOTSUPP; + goto done; + } + + switch (sk->sk_state) { + case BT_CONNECT: + case BT_CONNECT2: + case BT_CONFIG: + /* Already connecting */ + goto wait; + + case BT_CONNECTED: + /* Already connected */ + err = -EISCONN; + goto done; + + case BT_OPEN: + case BT_BOUND: + /* Can connect */ + break; + + default: + err = -EBADFD; + goto done; + } + + /* Set destination address and psm */ + bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); + l2cap_pi(sk)->psm = la.l2_psm; + + err = l2cap_do_connect(sk); + if (err) + goto done; + +wait: + err = bt_sock_wait_state(sk, BT_CONNECTED, + sock_sndtimeo(sk, flags & O_NONBLOCK)); +done: + release_sock(sk); + return err; +} + +static int l2cap_sock_listen(struct socket *sock, int backlog) +{ + struct sock *sk = sock->sk; + int err = 0; + + BT_DBG("sk %p backlog %d", sk, backlog); + + lock_sock(sk); + + if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) + || sk->sk_state != BT_BOUND) { + err = -EBADFD; + goto done; + } + + switch (l2cap_pi(sk)->mode) { + case L2CAP_MODE_BASIC: + break; + case L2CAP_MODE_ERTM: + case L2CAP_MODE_STREAMING: + if (enable_ertm) + break; + /* fall through */ + default: + err = -ENOTSUPP; + goto done; + } + + if (!l2cap_pi(sk)->psm) { + bdaddr_t *src = &bt_sk(sk)->src; + u16 psm; + + err = -EINVAL; + + write_lock_bh(&l2cap_sk_list.lock); + + for (psm = 0x1001; psm < 0x1100; psm += 2) + if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { + l2cap_pi(sk)->psm = cpu_to_le16(psm); + l2cap_pi(sk)->sport = cpu_to_le16(psm); + err = 0; + break; + } + + write_unlock_bh(&l2cap_sk_list.lock); + + if (err < 0) + goto done; + } + + sk->sk_max_ack_backlog = backlog; + sk->sk_ack_backlog = 0; + sk->sk_state = BT_LISTEN; + +done: + release_sock(sk); + return err; +} + +static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) +{ + DECLARE_WAITQUEUE(wait, current); + struct sock *sk = sock->sk, *nsk; + long timeo; + int err = 0; + + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); + + if (sk->sk_state != BT_LISTEN) { + err = -EBADFD; + goto done; + } + + timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); + + BT_DBG("sk %p timeo %ld", sk, timeo); + + /* Wait for an incoming connection. (wake-one). */ + add_wait_queue_exclusive(sk_sleep(sk), &wait); + while (!(nsk = bt_accept_dequeue(sk, newsock))) { + set_current_state(TASK_INTERRUPTIBLE); + if (!timeo) { + err = -EAGAIN; + break; + } + + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); + + if (sk->sk_state != BT_LISTEN) { + err = -EBADFD; + break; + } + + if (signal_pending(current)) { + err = sock_intr_errno(timeo); + break; + } + } + set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + + if (err) + goto done; + + newsock->state = SS_CONNECTED; + + BT_DBG("new socket %p", nsk); + +done: + release_sock(sk); + return err; +} + +static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) +{ + struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; + struct sock *sk = sock->sk; + + BT_DBG("sock %p, sk %p", sock, sk); + + addr->sa_family = AF_BLUETOOTH; + *len = sizeof(struct sockaddr_l2); + + if (peer) { + la->l2_psm = l2cap_pi(sk)->psm; + bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); + la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); + } else { + la->l2_psm = l2cap_pi(sk)->sport; + bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); + la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); + } + + return 0; +} + +static int __l2cap_wait_ack(struct sock *sk) +{ + DECLARE_WAITQUEUE(wait, current); + int err = 0; + int timeo = HZ/5; + + add_wait_queue(sk_sleep(sk), &wait); + while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { + set_current_state(TASK_INTERRUPTIBLE); + + if (!timeo) + timeo = HZ/5; + + if (signal_pending(current)) { + err = sock_intr_errno(timeo); + break; + } + + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock(sk); + + err = sock_error(sk); + if (err) + break; + } + set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + return err; +} + +static void l2cap_monitor_timeout(unsigned long arg) +{ + struct sock *sk = (void *) arg; + + BT_DBG("sk %p", sk); + + bh_lock_sock(sk); + if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { + l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); + bh_unlock_sock(sk); + return; + } + + l2cap_pi(sk)->retry_count++; + __mod_monitor_timer(); + + l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); + bh_unlock_sock(sk); +} + +static void l2cap_retrans_timeout(unsigned long arg) +{ + struct sock *sk = (void *) arg; + + BT_DBG("sk %p", sk); + + bh_lock_sock(sk); + l2cap_pi(sk)->retry_count = 1; + __mod_monitor_timer(); + + l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; + + l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); + bh_unlock_sock(sk); +} + +static void l2cap_drop_acked_frames(struct sock *sk) +{ + struct sk_buff *skb; + + while ((skb = skb_peek(TX_QUEUE(sk))) && + l2cap_pi(sk)->unacked_frames) { + if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) + break; + + skb = skb_dequeue(TX_QUEUE(sk)); + kfree_skb(skb); + + l2cap_pi(sk)->unacked_frames--; + } + + if (!l2cap_pi(sk)->unacked_frames) + del_timer(&l2cap_pi(sk)->retrans_timer); +} + +static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + + BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); + + hci_send_acl(pi->conn->hcon, skb, 0); +} + +static void l2cap_streaming_send(struct sock *sk) +{ + struct sk_buff *skb, *tx_skb; + struct l2cap_pinfo *pi = l2cap_pi(sk); + u16 control, fcs; + + while ((skb = sk->sk_send_head)) { + tx_skb = skb_clone(skb, GFP_ATOMIC); + + control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); + control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; + put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); + + if (pi->fcs == L2CAP_FCS_CRC16) { + fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); + put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); + } + + l2cap_do_send(sk, tx_skb); + + pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; + + if (skb_queue_is_last(TX_QUEUE(sk), skb)) + sk->sk_send_head = NULL; + else + sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); + + skb = skb_dequeue(TX_QUEUE(sk)); + kfree_skb(skb); + } +} + +static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *skb, *tx_skb; + u16 control, fcs; + + skb = skb_peek(TX_QUEUE(sk)); + if (!skb) + return; + + do { + if (bt_cb(skb)->tx_seq == tx_seq) + break; + + if (skb_queue_is_last(TX_QUEUE(sk), skb)) + return; + + } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); + + if (pi->remote_max_tx && + bt_cb(skb)->retries == pi->remote_max_tx) { + l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); + return; + } + + tx_skb = skb_clone(skb, GFP_ATOMIC); + bt_cb(skb)->retries++; + control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); + + if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { + control |= L2CAP_CTRL_FINAL; + pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; + } + + control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) + | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); + + put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); + + if (pi->fcs == L2CAP_FCS_CRC16) { + fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); + put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); + } + + l2cap_do_send(sk, tx_skb); +} + +static int l2cap_ertm_send(struct sock *sk) +{ + struct sk_buff *skb, *tx_skb; + struct l2cap_pinfo *pi = l2cap_pi(sk); + u16 control, fcs; + int nsent = 0; + + if (sk->sk_state != BT_CONNECTED) + return -ENOTCONN; + + while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { + + if (pi->remote_max_tx && + bt_cb(skb)->retries == pi->remote_max_tx) { + l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); + break; + } + + tx_skb = skb_clone(skb, GFP_ATOMIC); + + bt_cb(skb)->retries++; + + control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); + control &= L2CAP_CTRL_SAR; + + if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { + control |= L2CAP_CTRL_FINAL; + pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; + } + control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) + | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); + put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); + + + if (pi->fcs == L2CAP_FCS_CRC16) { + fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); + put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); + } + + l2cap_do_send(sk, tx_skb); + + __mod_retrans_timer(); + + bt_cb(skb)->tx_seq = pi->next_tx_seq; + pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; + + pi->unacked_frames++; + pi->frames_sent++; + + if (skb_queue_is_last(TX_QUEUE(sk), skb)) + sk->sk_send_head = NULL; + else + sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); + + nsent++; + } + + return nsent; +} + +static int l2cap_retransmit_frames(struct sock *sk) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + int ret; + + if (!skb_queue_empty(TX_QUEUE(sk))) + sk->sk_send_head = TX_QUEUE(sk)->next; + + pi->next_tx_seq = pi->expected_ack_seq; + ret = l2cap_ertm_send(sk); + return ret; +} + +static void l2cap_send_ack(struct l2cap_pinfo *pi) +{ + struct sock *sk = (struct sock *)pi; + u16 control = 0; + + control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { + control |= L2CAP_SUPER_RCV_NOT_READY; + pi->conn_state |= L2CAP_CONN_RNR_SENT; + l2cap_send_sframe(pi, control); + return; + } + + if (l2cap_ertm_send(sk) > 0) + return; + + control |= L2CAP_SUPER_RCV_READY; + l2cap_send_sframe(pi, control); +} + +static void l2cap_send_srejtail(struct sock *sk) +{ + struct srej_list *tail; + u16 control; + + control = L2CAP_SUPER_SELECT_REJECT; + control |= L2CAP_CTRL_FINAL; + + tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); + control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + l2cap_send_sframe(l2cap_pi(sk), control); +} + +static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct sk_buff **frag; + int err, sent = 0; + + if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) + return -EFAULT; + + sent += count; + len -= count; + + /* Continuation fragments (no L2CAP header) */ + frag = &skb_shinfo(skb)->frag_list; + while (len) { + count = min_t(unsigned int, conn->mtu, len); + + *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); + if (!*frag) + return -EFAULT; + if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) + return -EFAULT; + + sent += count; + len -= count; + + frag = &(*frag)->next; + } + + return sent; +} + +static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct sk_buff *skb; + int err, count, hlen = L2CAP_HDR_SIZE + 2; + struct l2cap_hdr *lh; + + BT_DBG("sk %p len %d", sk, (int)len); + + count = min_t(unsigned int, (conn->mtu - hlen), len); + skb = bt_skb_send_alloc(sk, count + hlen, + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) + return ERR_PTR(-ENOMEM); + + /* Create L2CAP header */ + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); + lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); + put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); + + err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); + if (unlikely(err < 0)) { + kfree_skb(skb); + return ERR_PTR(err); + } + return skb; +} + +static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct sk_buff *skb; + int err, count, hlen = L2CAP_HDR_SIZE; + struct l2cap_hdr *lh; + + BT_DBG("sk %p len %d", sk, (int)len); + + count = min_t(unsigned int, (conn->mtu - hlen), len); + skb = bt_skb_send_alloc(sk, count + hlen, + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) + return ERR_PTR(-ENOMEM); + + /* Create L2CAP header */ + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); + lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); + + err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); + if (unlikely(err < 0)) { + kfree_skb(skb); + return ERR_PTR(err); + } + return skb; +} + +static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct sk_buff *skb; + int err, count, hlen = L2CAP_HDR_SIZE + 2; + struct l2cap_hdr *lh; + + BT_DBG("sk %p len %d", sk, (int)len); + + if (!conn) + return ERR_PTR(-ENOTCONN); + + if (sdulen) + hlen += 2; + + if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) + hlen += 2; + + count = min_t(unsigned int, (conn->mtu - hlen), len); + skb = bt_skb_send_alloc(sk, count + hlen, + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) + return ERR_PTR(-ENOMEM); + + /* Create L2CAP header */ + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); + lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); + put_unaligned_le16(control, skb_put(skb, 2)); + if (sdulen) + put_unaligned_le16(sdulen, skb_put(skb, 2)); + + err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); + if (unlikely(err < 0)) { + kfree_skb(skb); + return ERR_PTR(err); + } + + if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) + put_unaligned_le16(0, skb_put(skb, 2)); + + bt_cb(skb)->retries = 0; + return skb; +} + +static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *skb; + struct sk_buff_head sar_queue; + u16 control; + size_t size = 0; + + skb_queue_head_init(&sar_queue); + control = L2CAP_SDU_START; + skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); + if (IS_ERR(skb)) + return PTR_ERR(skb); + + __skb_queue_tail(&sar_queue, skb); + len -= pi->remote_mps; + size += pi->remote_mps; + + while (len > 0) { + size_t buflen; + + if (len > pi->remote_mps) { + control = L2CAP_SDU_CONTINUE; + buflen = pi->remote_mps; + } else { + control = L2CAP_SDU_END; + buflen = len; + } + + skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); + if (IS_ERR(skb)) { + skb_queue_purge(&sar_queue); + return PTR_ERR(skb); + } + + __skb_queue_tail(&sar_queue, skb); + len -= buflen; + size += buflen; + } + skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); + if (sk->sk_send_head == NULL) + sk->sk_send_head = sar_queue.next; + + return size; +} + +static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) +{ + struct sock *sk = sock->sk; + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *skb; + u16 control; + int err; + + BT_DBG("sock %p, sk %p", sock, sk); + + err = sock_error(sk); + if (err) + return err; + + if (msg->msg_flags & MSG_OOB) + return -EOPNOTSUPP; + + lock_sock(sk); + + if (sk->sk_state != BT_CONNECTED) { + err = -ENOTCONN; + goto done; + } + + /* Connectionless channel */ + if (sk->sk_type == SOCK_DGRAM) { + skb = l2cap_create_connless_pdu(sk, msg, len); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + } else { + l2cap_do_send(sk, skb); + err = len; + } + goto done; + } + + switch (pi->mode) { + case L2CAP_MODE_BASIC: + /* Check outgoing MTU */ + if (len > pi->omtu) { + err = -EMSGSIZE; + goto done; + } + + /* Create a basic PDU */ + skb = l2cap_create_basic_pdu(sk, msg, len); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + goto done; + } + + l2cap_do_send(sk, skb); + err = len; + break; + + case L2CAP_MODE_ERTM: + case L2CAP_MODE_STREAMING: + /* Entire SDU fits into one PDU */ + if (len <= pi->remote_mps) { + control = L2CAP_SDU_UNSEGMENTED; + skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + goto done; + } + __skb_queue_tail(TX_QUEUE(sk), skb); + + if (sk->sk_send_head == NULL) + sk->sk_send_head = skb; + + } else { + /* Segment SDU into multiples PDUs */ + err = l2cap_sar_segment_sdu(sk, msg, len); + if (err < 0) + goto done; + } + + if (pi->mode == L2CAP_MODE_STREAMING) { + l2cap_streaming_send(sk); + } else { + if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && + pi->conn_state && L2CAP_CONN_WAIT_F) { + err = len; + break; + } + err = l2cap_ertm_send(sk); + } + + if (err >= 0) + err = len; + break; + + default: + BT_DBG("bad state %1.1x", pi->mode); + err = -EBADFD; + } + +done: + release_sock(sk); + return err; +} + +static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) +{ + struct sock *sk = sock->sk; + + lock_sock(sk); + + if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { + struct l2cap_conn_rsp rsp; + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + u8 buf[128]; + + sk->sk_state = BT_CONFIG; + + rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); + rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); + rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, + L2CAP_CONN_RSP, sizeof(rsp), &rsp); + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) { + release_sock(sk); + return 0; + } + + l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(sk, buf), buf); + l2cap_pi(sk)->num_conf_req++; + + release_sock(sk); + return 0; + } + + release_sock(sk); + + return bt_sock_recvmsg(iocb, sock, msg, len, flags); +} + +static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + struct l2cap_options opts; + int len, err = 0; + u32 opt; + + BT_DBG("sk %p", sk); + + lock_sock(sk); + + switch (optname) { + case L2CAP_OPTIONS: + opts.imtu = l2cap_pi(sk)->imtu; + opts.omtu = l2cap_pi(sk)->omtu; + opts.flush_to = l2cap_pi(sk)->flush_to; + opts.mode = l2cap_pi(sk)->mode; + opts.fcs = l2cap_pi(sk)->fcs; + opts.max_tx = l2cap_pi(sk)->max_tx; + opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; + + len = min_t(unsigned int, sizeof(opts), optlen); + if (copy_from_user((char *) &opts, optval, len)) { + err = -EFAULT; + break; + } + + if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) { + err = -EINVAL; + break; + } + + l2cap_pi(sk)->mode = opts.mode; + switch (l2cap_pi(sk)->mode) { + case L2CAP_MODE_BASIC: + l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE; + break; + case L2CAP_MODE_ERTM: + case L2CAP_MODE_STREAMING: + if (enable_ertm) + break; + /* fall through */ + default: + err = -EINVAL; + break; + } + + l2cap_pi(sk)->imtu = opts.imtu; + l2cap_pi(sk)->omtu = opts.omtu; + l2cap_pi(sk)->fcs = opts.fcs; + l2cap_pi(sk)->max_tx = opts.max_tx; + l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; + break; + + case L2CAP_LM: + if (get_user(opt, (u32 __user *) optval)) { + err = -EFAULT; + break; + } + + if (opt & L2CAP_LM_AUTH) + l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; + if (opt & L2CAP_LM_ENCRYPT) + l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; + if (opt & L2CAP_LM_SECURE) + l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; + + l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); + l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + struct bt_security sec; + int len, err = 0; + u32 opt; + + BT_DBG("sk %p", sk); + + if (level == SOL_L2CAP) + return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); + + if (level != SOL_BLUETOOTH) + return -ENOPROTOOPT; + + lock_sock(sk); + + switch (optname) { + case BT_SECURITY: + if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM + && sk->sk_type != SOCK_RAW) { + err = -EINVAL; + break; + } + + sec.level = BT_SECURITY_LOW; + + len = min_t(unsigned int, sizeof(sec), optlen); + if (copy_from_user((char *) &sec, optval, len)) { + err = -EFAULT; + break; + } + + if (sec.level < BT_SECURITY_LOW || + sec.level > BT_SECURITY_HIGH) { + err = -EINVAL; + break; + } + + l2cap_pi(sk)->sec_level = sec.level; + break; + + case BT_DEFER_SETUP: + if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { + err = -EINVAL; + break; + } + + if (get_user(opt, (u32 __user *) optval)) { + err = -EFAULT; + break; + } + + bt_sk(sk)->defer_setup = opt; + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) +{ + struct sock *sk = sock->sk; + struct l2cap_options opts; + struct l2cap_conninfo cinfo; + int len, err = 0; + u32 opt; + + BT_DBG("sk %p", sk); + + if (get_user(len, optlen)) + return -EFAULT; + + lock_sock(sk); + + switch (optname) { + case L2CAP_OPTIONS: + opts.imtu = l2cap_pi(sk)->imtu; + opts.omtu = l2cap_pi(sk)->omtu; + opts.flush_to = l2cap_pi(sk)->flush_to; + opts.mode = l2cap_pi(sk)->mode; + opts.fcs = l2cap_pi(sk)->fcs; + opts.max_tx = l2cap_pi(sk)->max_tx; + opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; + + len = min_t(unsigned int, len, sizeof(opts)); + if (copy_to_user(optval, (char *) &opts, len)) + err = -EFAULT; + + break; + + case L2CAP_LM: + switch (l2cap_pi(sk)->sec_level) { + case BT_SECURITY_LOW: + opt = L2CAP_LM_AUTH; + break; + case BT_SECURITY_MEDIUM: + opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; + break; + case BT_SECURITY_HIGH: + opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | + L2CAP_LM_SECURE; + break; + default: + opt = 0; + break; + } + + if (l2cap_pi(sk)->role_switch) + opt |= L2CAP_LM_MASTER; + + if (l2cap_pi(sk)->force_reliable) + opt |= L2CAP_LM_RELIABLE; + + if (put_user(opt, (u32 __user *) optval)) + err = -EFAULT; + break; + + case L2CAP_CONNINFO: + if (sk->sk_state != BT_CONNECTED && + !(sk->sk_state == BT_CONNECT2 && + bt_sk(sk)->defer_setup)) { + err = -ENOTCONN; + break; + } + + cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; + memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); + + len = min_t(unsigned int, len, sizeof(cinfo)); + if (copy_to_user(optval, (char *) &cinfo, len)) + err = -EFAULT; + + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) +{ + struct sock *sk = sock->sk; + struct bt_security sec; + int len, err = 0; + + BT_DBG("sk %p", sk); + + if (level == SOL_L2CAP) + return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); + + if (level != SOL_BLUETOOTH) + return -ENOPROTOOPT; + + if (get_user(len, optlen)) + return -EFAULT; + + lock_sock(sk); + + switch (optname) { + case BT_SECURITY: + if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM + && sk->sk_type != SOCK_RAW) { + err = -EINVAL; + break; + } + + sec.level = l2cap_pi(sk)->sec_level; + + len = min_t(unsigned int, len, sizeof(sec)); + if (copy_to_user(optval, (char *) &sec, len)) + err = -EFAULT; + + break; + + case BT_DEFER_SETUP: + if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { + err = -EINVAL; + break; + } + + if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) + err = -EFAULT; + + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int l2cap_sock_shutdown(struct socket *sock, int how) +{ + struct sock *sk = sock->sk; + int err = 0; + + BT_DBG("sock %p, sk %p", sock, sk); + + if (!sk) + return 0; + + lock_sock(sk); + if (!sk->sk_shutdown) { + if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) + err = __l2cap_wait_ack(sk); + + sk->sk_shutdown = SHUTDOWN_MASK; + l2cap_sock_clear_timer(sk); + __l2cap_sock_close(sk, 0); + + if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) + err = bt_sock_wait_state(sk, BT_CLOSED, + sk->sk_lingertime); + } + + if (!err && sk->sk_err) + err = -sk->sk_err; + + release_sock(sk); + return err; +} + +static int l2cap_sock_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + int err; + + BT_DBG("sock %p, sk %p", sock, sk); + + if (!sk) + return 0; + + err = l2cap_sock_shutdown(sock, 2); + + sock_orphan(sk); + l2cap_sock_kill(sk); + return err; +} + +static void l2cap_chan_ready(struct sock *sk) +{ + struct sock *parent = bt_sk(sk)->parent; + + BT_DBG("sk %p, parent %p", sk, parent); + + l2cap_pi(sk)->conf_state = 0; + l2cap_sock_clear_timer(sk); + + if (!parent) { + /* Outgoing channel. + * Wake up socket sleeping on connect. + */ + sk->sk_state = BT_CONNECTED; + sk->sk_state_change(sk); + } else { + /* Incoming channel. + * Wake up socket sleeping on accept. + */ + parent->sk_data_ready(parent, 0); + } +} + +/* Copy frame to all raw sockets on that connection */ +static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) +{ + struct l2cap_chan_list *l = &conn->chan_list; + struct sk_buff *nskb; + struct sock *sk; + + BT_DBG("conn %p", conn); + + read_lock(&l->lock); + for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { + if (sk->sk_type != SOCK_RAW) + continue; + + /* Don't send frame to the socket it came from */ + if (skb->sk == sk) + continue; + nskb = skb_clone(skb, GFP_ATOMIC); + if (!nskb) + continue; + + if (sock_queue_rcv_skb(sk, nskb)) + kfree_skb(nskb); + } + read_unlock(&l->lock); +} + +/* ---- L2CAP signalling commands ---- */ +static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, + u8 code, u8 ident, u16 dlen, void *data) +{ + struct sk_buff *skb, **frag; + struct l2cap_cmd_hdr *cmd; + struct l2cap_hdr *lh; + int len, count; + + BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", + conn, code, ident, dlen); + + len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; + count = min_t(unsigned int, conn->mtu, len); + + skb = bt_skb_alloc(count, GFP_ATOMIC); + if (!skb) + return NULL; + + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); + lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); + + cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); + cmd->code = code; + cmd->ident = ident; + cmd->len = cpu_to_le16(dlen); + + if (dlen) { + count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; + memcpy(skb_put(skb, count), data, count); + data += count; + } + + len -= skb->len; + + /* Continuation fragments (no L2CAP header) */ + frag = &skb_shinfo(skb)->frag_list; + while (len) { + count = min_t(unsigned int, conn->mtu, len); + + *frag = bt_skb_alloc(count, GFP_ATOMIC); + if (!*frag) + goto fail; + + memcpy(skb_put(*frag, count), data, count); + + len -= count; + data += count; + + frag = &(*frag)->next; + } + + return skb; + +fail: + kfree_skb(skb); + return NULL; +} + +static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) +{ + struct l2cap_conf_opt *opt = *ptr; + int len; + + len = L2CAP_CONF_OPT_SIZE + opt->len; + *ptr += len; + + *type = opt->type; + *olen = opt->len; + + switch (opt->len) { + case 1: + *val = *((u8 *) opt->val); + break; + + case 2: + *val = __le16_to_cpu(*((__le16 *) opt->val)); + break; + + case 4: + *val = __le32_to_cpu(*((__le32 *) opt->val)); + break; + + default: + *val = (unsigned long) opt->val; + break; + } + + BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); + return len; +} + +static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) +{ + struct l2cap_conf_opt *opt = *ptr; + + BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); + + opt->type = type; + opt->len = len; + + switch (len) { + case 1: + *((u8 *) opt->val) = val; + break; + + case 2: + *((__le16 *) opt->val) = cpu_to_le16(val); + break; + + case 4: + *((__le32 *) opt->val) = cpu_to_le32(val); + break; + + default: + memcpy(opt->val, (void *) val, len); + break; + } + + *ptr += L2CAP_CONF_OPT_SIZE + len; +} + +static void l2cap_ack_timeout(unsigned long arg) +{ + struct sock *sk = (void *) arg; + + bh_lock_sock(sk); + l2cap_send_ack(l2cap_pi(sk)); + bh_unlock_sock(sk); +} + +static inline void l2cap_ertm_init(struct sock *sk) +{ + l2cap_pi(sk)->expected_ack_seq = 0; + l2cap_pi(sk)->unacked_frames = 0; + l2cap_pi(sk)->buffer_seq = 0; + l2cap_pi(sk)->num_acked = 0; + l2cap_pi(sk)->frames_sent = 0; + + setup_timer(&l2cap_pi(sk)->retrans_timer, + l2cap_retrans_timeout, (unsigned long) sk); + setup_timer(&l2cap_pi(sk)->monitor_timer, + l2cap_monitor_timeout, (unsigned long) sk); + setup_timer(&l2cap_pi(sk)->ack_timer, + l2cap_ack_timeout, (unsigned long) sk); + + __skb_queue_head_init(SREJ_QUEUE(sk)); + __skb_queue_head_init(BUSY_QUEUE(sk)); + + INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); + + sk->sk_backlog_rcv = l2cap_ertm_data_rcv; +} + +static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) +{ + switch (mode) { + case L2CAP_MODE_STREAMING: + case L2CAP_MODE_ERTM: + if (l2cap_mode_supported(mode, remote_feat_mask)) + return mode; + /* fall through */ + default: + return L2CAP_MODE_BASIC; + } +} + +static int l2cap_build_conf_req(struct sock *sk, void *data) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct l2cap_conf_req *req = data; + struct l2cap_conf_rfc rfc = { .mode = pi->mode }; + void *ptr = req->data; + + BT_DBG("sk %p", sk); + + if (pi->num_conf_req || pi->num_conf_rsp) + goto done; + + switch (pi->mode) { + case L2CAP_MODE_STREAMING: + case L2CAP_MODE_ERTM: + if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) + break; + + /* fall through */ + default: + pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); + break; + } + +done: + switch (pi->mode) { + case L2CAP_MODE_BASIC: + if (pi->imtu != L2CAP_DEFAULT_MTU) + l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); + + rfc.mode = L2CAP_MODE_BASIC; + rfc.txwin_size = 0; + rfc.max_transmit = 0; + rfc.retrans_timeout = 0; + rfc.monitor_timeout = 0; + rfc.max_pdu_size = 0; + + break; + + case L2CAP_MODE_ERTM: + rfc.mode = L2CAP_MODE_ERTM; + rfc.txwin_size = pi->tx_win; + rfc.max_transmit = pi->max_tx; + rfc.retrans_timeout = 0; + rfc.monitor_timeout = 0; + rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); + if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) + rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); + + if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) + break; + + if (pi->fcs == L2CAP_FCS_NONE || + pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { + pi->fcs = L2CAP_FCS_NONE; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); + } + break; + + case L2CAP_MODE_STREAMING: + rfc.mode = L2CAP_MODE_STREAMING; + rfc.txwin_size = 0; + rfc.max_transmit = 0; + rfc.retrans_timeout = 0; + rfc.monitor_timeout = 0; + rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); + if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) + rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); + + if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) + break; + + if (pi->fcs == L2CAP_FCS_NONE || + pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { + pi->fcs = L2CAP_FCS_NONE; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); + } + break; + } + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), + (unsigned long) &rfc); + + /* FIXME: Need actual value of the flush timeout */ + //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) + // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); + + req->dcid = cpu_to_le16(pi->dcid); + req->flags = cpu_to_le16(0); + + return ptr - data; +} + +static int l2cap_parse_conf_req(struct sock *sk, void *data) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct l2cap_conf_rsp *rsp = data; + void *ptr = rsp->data; + void *req = pi->conf_req; + int len = pi->conf_len; + int type, hint, olen; + unsigned long val; + struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; + u16 mtu = L2CAP_DEFAULT_MTU; + u16 result = L2CAP_CONF_SUCCESS; + + BT_DBG("sk %p", sk); + + while (len >= L2CAP_CONF_OPT_SIZE) { + len -= l2cap_get_conf_opt(&req, &type, &olen, &val); + + hint = type & L2CAP_CONF_HINT; + type &= L2CAP_CONF_MASK; + + switch (type) { + case L2CAP_CONF_MTU: + mtu = val; + break; + + case L2CAP_CONF_FLUSH_TO: + pi->flush_to = val; + break; + + case L2CAP_CONF_QOS: + break; + + case L2CAP_CONF_RFC: + if (olen == sizeof(rfc)) + memcpy(&rfc, (void *) val, olen); + break; + + case L2CAP_CONF_FCS: + if (val == L2CAP_FCS_NONE) + pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; + + break; + + default: + if (hint) + break; + + result = L2CAP_CONF_UNKNOWN; + *((u8 *) ptr++) = type; + break; + } + } + + if (pi->num_conf_rsp || pi->num_conf_req > 1) + goto done; + + switch (pi->mode) { + case L2CAP_MODE_STREAMING: + case L2CAP_MODE_ERTM: + if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { + pi->mode = l2cap_select_mode(rfc.mode, + pi->conn->feat_mask); + break; + } + + if (pi->mode != rfc.mode) + return -ECONNREFUSED; + + break; + } + +done: + if (pi->mode != rfc.mode) { + result = L2CAP_CONF_UNACCEPT; + rfc.mode = pi->mode; + + if (pi->num_conf_rsp == 1) + return -ECONNREFUSED; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + } + + + if (result == L2CAP_CONF_SUCCESS) { + /* Configure output options and let the other side know + * which ones we don't like. */ + + if (mtu < L2CAP_DEFAULT_MIN_MTU) + result = L2CAP_CONF_UNACCEPT; + else { + pi->omtu = mtu; + pi->conf_state |= L2CAP_CONF_MTU_DONE; + } + l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); + + switch (rfc.mode) { + case L2CAP_MODE_BASIC: + pi->fcs = L2CAP_FCS_NONE; + pi->conf_state |= L2CAP_CONF_MODE_DONE; + break; + + case L2CAP_MODE_ERTM: + pi->remote_tx_win = rfc.txwin_size; + pi->remote_max_tx = rfc.max_transmit; + if (rfc.max_pdu_size > pi->conn->mtu - 10) + rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); + + pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); + + rfc.retrans_timeout = + le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); + rfc.monitor_timeout = + le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); + + pi->conf_state |= L2CAP_CONF_MODE_DONE; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + + break; + + case L2CAP_MODE_STREAMING: + if (rfc.max_pdu_size > pi->conn->mtu - 10) + rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); + + pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); + + pi->conf_state |= L2CAP_CONF_MODE_DONE; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + + break; + + default: + result = L2CAP_CONF_UNACCEPT; + + memset(&rfc, 0, sizeof(rfc)); + rfc.mode = pi->mode; + } + + if (result == L2CAP_CONF_SUCCESS) + pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; + } + rsp->scid = cpu_to_le16(pi->dcid); + rsp->result = cpu_to_le16(result); + rsp->flags = cpu_to_le16(0x0000); + + return ptr - data; +} + +static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct l2cap_conf_req *req = data; + void *ptr = req->data; + int type, olen; + unsigned long val; + struct l2cap_conf_rfc rfc; + + BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); + + while (len >= L2CAP_CONF_OPT_SIZE) { + len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); + + switch (type) { + case L2CAP_CONF_MTU: + if (val < L2CAP_DEFAULT_MIN_MTU) { + *result = L2CAP_CONF_UNACCEPT; + pi->omtu = L2CAP_DEFAULT_MIN_MTU; + } else + pi->omtu = val; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); + break; + + case L2CAP_CONF_FLUSH_TO: + pi->flush_to = val; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, + 2, pi->flush_to); + break; + + case L2CAP_CONF_RFC: + if (olen == sizeof(rfc)) + memcpy(&rfc, (void *)val, olen); + + if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && + rfc.mode != pi->mode) + return -ECONNREFUSED; + + pi->fcs = 0; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + break; + } + } + + if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) + return -ECONNREFUSED; + + pi->mode = rfc.mode; + + if (*result == L2CAP_CONF_SUCCESS) { + switch (rfc.mode) { + case L2CAP_MODE_ERTM: + pi->remote_tx_win = rfc.txwin_size; + pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); + pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); + pi->mps = le16_to_cpu(rfc.max_pdu_size); + break; + case L2CAP_MODE_STREAMING: + pi->mps = le16_to_cpu(rfc.max_pdu_size); + } + } + + req->dcid = cpu_to_le16(pi->dcid); + req->flags = cpu_to_le16(0x0000); + + return ptr - data; +} + +static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) +{ + struct l2cap_conf_rsp *rsp = data; + void *ptr = rsp->data; + + BT_DBG("sk %p", sk); + + rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); + rsp->result = cpu_to_le16(result); + rsp->flags = cpu_to_le16(flags); + + return ptr - data; +} + +static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + int type, olen; + unsigned long val; + struct l2cap_conf_rfc rfc; + + BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); + + if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) + return; + + while (len >= L2CAP_CONF_OPT_SIZE) { + len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); + + switch (type) { + case L2CAP_CONF_RFC: + if (olen == sizeof(rfc)) + memcpy(&rfc, (void *)val, olen); + goto done; + } + } + +done: + switch (rfc.mode) { + case L2CAP_MODE_ERTM: + pi->remote_tx_win = rfc.txwin_size; + pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); + pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); + pi->mps = le16_to_cpu(rfc.max_pdu_size); + break; + case L2CAP_MODE_STREAMING: + pi->mps = le16_to_cpu(rfc.max_pdu_size); + } +} + +static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; + + if (rej->reason != 0x0000) + return 0; + + if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && + cmd->ident == conn->info_ident) { + del_timer(&conn->info_timer); + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); + } + + return 0; +} + +static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_chan_list *list = &conn->chan_list; + struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; + struct l2cap_conn_rsp rsp; + struct sock *parent, *uninitialized_var(sk); + int result, status = L2CAP_CS_NO_INFO; + + u16 dcid = 0, scid = __le16_to_cpu(req->scid); + __le16 psm = req->psm; + + BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); + + /* Check if we have socket listening on psm */ + parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); + if (!parent) { + result = L2CAP_CR_BAD_PSM; + goto sendresp; + } + + /* Check if the ACL is secure enough (if not SDP) */ + if (psm != cpu_to_le16(0x0001) && + !hci_conn_check_link_mode(conn->hcon)) { + conn->disc_reason = 0x05; + result = L2CAP_CR_SEC_BLOCK; + goto response; + } + + result = L2CAP_CR_NO_MEM; + + /* Check for backlog size */ + if (sk_acceptq_is_full(parent)) { + BT_DBG("backlog full %d", parent->sk_ack_backlog); + goto response; + } + + sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); + if (!sk) + goto response; + + write_lock_bh(&list->lock); + + /* Check if we already have channel with that dcid */ + if (__l2cap_get_chan_by_dcid(list, scid)) { + write_unlock_bh(&list->lock); + sock_set_flag(sk, SOCK_ZAPPED); + l2cap_sock_kill(sk); + goto response; + } + + hci_conn_hold(conn->hcon); + + l2cap_sock_init(sk, parent); + bacpy(&bt_sk(sk)->src, conn->src); + bacpy(&bt_sk(sk)->dst, conn->dst); + l2cap_pi(sk)->psm = psm; + l2cap_pi(sk)->dcid = scid; + + __l2cap_chan_add(conn, sk, parent); + dcid = l2cap_pi(sk)->scid; + + l2cap_sock_set_timer(sk, sk->sk_sndtimeo); + + l2cap_pi(sk)->ident = cmd->ident; + + if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { + if (l2cap_check_security(sk)) { + if (bt_sk(sk)->defer_setup) { + sk->sk_state = BT_CONNECT2; + result = L2CAP_CR_PEND; + status = L2CAP_CS_AUTHOR_PEND; + parent->sk_data_ready(parent, 0); + } else { + sk->sk_state = BT_CONFIG; + result = L2CAP_CR_SUCCESS; + status = L2CAP_CS_NO_INFO; + } + } else { + sk->sk_state = BT_CONNECT2; + result = L2CAP_CR_PEND; + status = L2CAP_CS_AUTHEN_PEND; + } + } else { + sk->sk_state = BT_CONNECT2; + result = L2CAP_CR_PEND; + status = L2CAP_CS_NO_INFO; + } + + write_unlock_bh(&list->lock); + +response: + bh_unlock_sock(parent); + +sendresp: + rsp.scid = cpu_to_le16(scid); + rsp.dcid = cpu_to_le16(dcid); + rsp.result = cpu_to_le16(result); + rsp.status = cpu_to_le16(status); + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); + + if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { + struct l2cap_info_req info; + info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; + conn->info_ident = l2cap_get_ident(conn); + + mod_timer(&conn->info_timer, jiffies + + msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); + + l2cap_send_cmd(conn, conn->info_ident, + L2CAP_INFO_REQ, sizeof(info), &info); + } + + if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && + result == L2CAP_CR_SUCCESS) { + u8 buf[128]; + l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(sk, buf), buf); + l2cap_pi(sk)->num_conf_req++; + } + + return 0; +} + +static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; + u16 scid, dcid, result, status; + struct sock *sk; + u8 req[128]; + + scid = __le16_to_cpu(rsp->scid); + dcid = __le16_to_cpu(rsp->dcid); + result = __le16_to_cpu(rsp->result); + status = __le16_to_cpu(rsp->status); + + BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); + + if (scid) { + sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); + if (!sk) + return -EFAULT; + } else { + sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); + if (!sk) + return -EFAULT; + } + + switch (result) { + case L2CAP_CR_SUCCESS: + sk->sk_state = BT_CONFIG; + l2cap_pi(sk)->ident = 0; + l2cap_pi(sk)->dcid = dcid; + l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) + break; + + l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; + + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(sk, req), req); + l2cap_pi(sk)->num_conf_req++; + break; + + case L2CAP_CR_PEND: + l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; + break; + + default: + l2cap_chan_del(sk, ECONNREFUSED); + break; + } + + bh_unlock_sock(sk); + return 0; +} + +static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) +{ + struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; + u16 dcid, flags; + u8 rsp[64]; + struct sock *sk; + int len; + + dcid = __le16_to_cpu(req->dcid); + flags = __le16_to_cpu(req->flags); + + BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); + + sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); + if (!sk) + return -ENOENT; + + if (sk->sk_state != BT_CONFIG) { + struct l2cap_cmd_rej rej; + + rej.reason = cpu_to_le16(0x0002); + l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, + sizeof(rej), &rej); + goto unlock; + } + + /* Reject if config buffer is too small. */ + len = cmd_len - sizeof(*req); + if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, + l2cap_build_conf_rsp(sk, rsp, + L2CAP_CONF_REJECT, flags), rsp); + goto unlock; + } + + /* Store config. */ + memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); + l2cap_pi(sk)->conf_len += len; + + if (flags & 0x0001) { + /* Incomplete config. Send empty response. */ + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, + l2cap_build_conf_rsp(sk, rsp, + L2CAP_CONF_SUCCESS, 0x0001), rsp); + goto unlock; + } + + /* Complete config. */ + len = l2cap_parse_conf_req(sk, rsp); + if (len < 0) { + l2cap_send_disconn_req(conn, sk, ECONNRESET); + goto unlock; + } + + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); + l2cap_pi(sk)->num_conf_rsp++; + + /* Reset config buffer. */ + l2cap_pi(sk)->conf_len = 0; + + if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) + goto unlock; + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { + if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || + l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) + l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; + + sk->sk_state = BT_CONNECTED; + + l2cap_pi(sk)->next_tx_seq = 0; + l2cap_pi(sk)->expected_tx_seq = 0; + __skb_queue_head_init(TX_QUEUE(sk)); + if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) + l2cap_ertm_init(sk); + + l2cap_chan_ready(sk); + goto unlock; + } + + if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { + u8 buf[64]; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(sk, buf), buf); + l2cap_pi(sk)->num_conf_req++; + } + +unlock: + bh_unlock_sock(sk); + return 0; +} + +static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; + u16 scid, flags, result; + struct sock *sk; + int len = cmd->len - sizeof(*rsp); + + scid = __le16_to_cpu(rsp->scid); + flags = __le16_to_cpu(rsp->flags); + result = __le16_to_cpu(rsp->result); + + BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", + scid, flags, result); + + sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); + if (!sk) + return 0; + + switch (result) { + case L2CAP_CONF_SUCCESS: + l2cap_conf_rfc_get(sk, rsp->data, len); + break; + + case L2CAP_CONF_UNACCEPT: + if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { + char req[64]; + + if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { + l2cap_send_disconn_req(conn, sk, ECONNRESET); + goto done; + } + + /* throw out any old stored conf requests */ + result = L2CAP_CONF_SUCCESS; + len = l2cap_parse_conf_rsp(sk, rsp->data, + len, req, &result); + if (len < 0) { + l2cap_send_disconn_req(conn, sk, ECONNRESET); + goto done; + } + + l2cap_send_cmd(conn, l2cap_get_ident(conn), + L2CAP_CONF_REQ, len, req); + l2cap_pi(sk)->num_conf_req++; + if (result != L2CAP_CONF_SUCCESS) + goto done; + break; + } + + default: + sk->sk_err = ECONNRESET; + l2cap_sock_set_timer(sk, HZ * 5); + l2cap_send_disconn_req(conn, sk, ECONNRESET); + goto done; + } + + if (flags & 0x01) + goto done; + + l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { + if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || + l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) + l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; + + sk->sk_state = BT_CONNECTED; + l2cap_pi(sk)->next_tx_seq = 0; + l2cap_pi(sk)->expected_tx_seq = 0; + __skb_queue_head_init(TX_QUEUE(sk)); + if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) + l2cap_ertm_init(sk); + + l2cap_chan_ready(sk); + } + +done: + bh_unlock_sock(sk); + return 0; +} + +static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; + struct l2cap_disconn_rsp rsp; + u16 dcid, scid; + struct sock *sk; + + scid = __le16_to_cpu(req->scid); + dcid = __le16_to_cpu(req->dcid); + + BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); + + sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); + if (!sk) + return 0; + + rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); + rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); + l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); + + sk->sk_shutdown = SHUTDOWN_MASK; + + l2cap_chan_del(sk, ECONNRESET); + bh_unlock_sock(sk); + + l2cap_sock_kill(sk); + return 0; +} + +static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; + u16 dcid, scid; + struct sock *sk; + + scid = __le16_to_cpu(rsp->scid); + dcid = __le16_to_cpu(rsp->dcid); + + BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); + + sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); + if (!sk) + return 0; + + l2cap_chan_del(sk, 0); + bh_unlock_sock(sk); + + l2cap_sock_kill(sk); + return 0; +} + +static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_info_req *req = (struct l2cap_info_req *) data; + u16 type; + + type = __le16_to_cpu(req->type); + + BT_DBG("type 0x%4.4x", type); + + if (type == L2CAP_IT_FEAT_MASK) { + u8 buf[8]; + u32 feat_mask = l2cap_feat_mask; + struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; + rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); + rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); + if (enable_ertm) + feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING + | L2CAP_FEAT_FCS; + put_unaligned_le32(feat_mask, rsp->data); + l2cap_send_cmd(conn, cmd->ident, + L2CAP_INFO_RSP, sizeof(buf), buf); + } else if (type == L2CAP_IT_FIXED_CHAN) { + u8 buf[12]; + struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; + rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); + rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); + memcpy(buf + 4, l2cap_fixed_chan, 8); + l2cap_send_cmd(conn, cmd->ident, + L2CAP_INFO_RSP, sizeof(buf), buf); + } else { + struct l2cap_info_rsp rsp; + rsp.type = cpu_to_le16(type); + rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); + l2cap_send_cmd(conn, cmd->ident, + L2CAP_INFO_RSP, sizeof(rsp), &rsp); + } + + return 0; +} + +static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; + u16 type, result; + + type = __le16_to_cpu(rsp->type); + result = __le16_to_cpu(rsp->result); + + BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); + + del_timer(&conn->info_timer); + + if (type == L2CAP_IT_FEAT_MASK) { + conn->feat_mask = get_unaligned_le32(rsp->data); + + if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { + struct l2cap_info_req req; + req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); + + conn->info_ident = l2cap_get_ident(conn); + + l2cap_send_cmd(conn, conn->info_ident, + L2CAP_INFO_REQ, sizeof(req), &req); + } else { + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); + } + } else if (type == L2CAP_IT_FIXED_CHAN) { + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); + } + + return 0; +} + +static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) +{ + u8 *data = skb->data; + int len = skb->len; + struct l2cap_cmd_hdr cmd; + int err = 0; + + l2cap_raw_recv(conn, skb); + + while (len >= L2CAP_CMD_HDR_SIZE) { + u16 cmd_len; + memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); + data += L2CAP_CMD_HDR_SIZE; + len -= L2CAP_CMD_HDR_SIZE; + + cmd_len = le16_to_cpu(cmd.len); + + BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); + + if (cmd_len > len || !cmd.ident) { + BT_DBG("corrupted command"); + break; + } + + switch (cmd.code) { + case L2CAP_COMMAND_REJ: + l2cap_command_rej(conn, &cmd, data); + break; + + case L2CAP_CONN_REQ: + err = l2cap_connect_req(conn, &cmd, data); + break; + + case L2CAP_CONN_RSP: + err = l2cap_connect_rsp(conn, &cmd, data); + break; + + case L2CAP_CONF_REQ: + err = l2cap_config_req(conn, &cmd, cmd_len, data); + break; + + case L2CAP_CONF_RSP: + err = l2cap_config_rsp(conn, &cmd, data); + break; + + case L2CAP_DISCONN_REQ: + err = l2cap_disconnect_req(conn, &cmd, data); + break; + + case L2CAP_DISCONN_RSP: + err = l2cap_disconnect_rsp(conn, &cmd, data); + break; + + case L2CAP_ECHO_REQ: + l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); + break; + + case L2CAP_ECHO_RSP: + break; + + case L2CAP_INFO_REQ: + err = l2cap_information_req(conn, &cmd, data); + break; + + case L2CAP_INFO_RSP: + err = l2cap_information_rsp(conn, &cmd, data); + break; + + default: + BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); + err = -EINVAL; + break; + } + + if (err) { + struct l2cap_cmd_rej rej; + BT_DBG("error %d", err); + + /* FIXME: Map err to a valid reason */ + rej.reason = cpu_to_le16(0); + l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); + } + + data += cmd_len; + len -= cmd_len; + } + + kfree_skb(skb); +} + +static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) +{ + u16 our_fcs, rcv_fcs; + int hdr_size = L2CAP_HDR_SIZE + 2; + + if (pi->fcs == L2CAP_FCS_CRC16) { + skb_trim(skb, skb->len - 2); + rcv_fcs = get_unaligned_le16(skb->data + skb->len); + our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); + + if (our_fcs != rcv_fcs) + return -EBADMSG; + } + return 0; +} + +static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u16 control = 0; + + pi->frames_sent = 0; + + control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { + control |= L2CAP_SUPER_RCV_NOT_READY; + l2cap_send_sframe(pi, control); + pi->conn_state |= L2CAP_CONN_RNR_SENT; + } + + if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) + l2cap_retransmit_frames(sk); + + l2cap_ertm_send(sk); + + if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && + pi->frames_sent == 0) { + control |= L2CAP_SUPER_RCV_READY; + l2cap_send_sframe(pi, control); + } +} + +static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) +{ + struct sk_buff *next_skb; + struct l2cap_pinfo *pi = l2cap_pi(sk); + int tx_seq_offset, next_tx_seq_offset; + + bt_cb(skb)->tx_seq = tx_seq; + bt_cb(skb)->sar = sar; + + next_skb = skb_peek(SREJ_QUEUE(sk)); + if (!next_skb) { + __skb_queue_tail(SREJ_QUEUE(sk), skb); + return 0; + } + + tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; + if (tx_seq_offset < 0) + tx_seq_offset += 64; + + do { + if (bt_cb(next_skb)->tx_seq == tx_seq) + return -EINVAL; + + next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - + pi->buffer_seq) % 64; + if (next_tx_seq_offset < 0) + next_tx_seq_offset += 64; + + if (next_tx_seq_offset > tx_seq_offset) { + __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); + return 0; + } + + if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) + break; + + } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); + + __skb_queue_tail(SREJ_QUEUE(sk), skb); + + return 0; +} + +static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *_skb; + int err; + + switch (control & L2CAP_CTRL_SAR) { + case L2CAP_SDU_UNSEGMENTED: + if (pi->conn_state & L2CAP_CONN_SAR_SDU) + goto drop; + + err = sock_queue_rcv_skb(sk, skb); + if (!err) + return err; + + break; + + case L2CAP_SDU_START: + if (pi->conn_state & L2CAP_CONN_SAR_SDU) + goto drop; + + pi->sdu_len = get_unaligned_le16(skb->data); + + if (pi->sdu_len > pi->imtu) + goto disconnect; + + pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); + if (!pi->sdu) + return -ENOMEM; + + /* pull sdu_len bytes only after alloc, because of Local Busy + * condition we have to be sure that this will be executed + * only once, i.e., when alloc does not fail */ + skb_pull(skb, 2); + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + + pi->conn_state |= L2CAP_CONN_SAR_SDU; + pi->partial_sdu_len = skb->len; + break; + + case L2CAP_SDU_CONTINUE: + if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) + goto disconnect; + + if (!pi->sdu) + goto disconnect; + + pi->partial_sdu_len += skb->len; + if (pi->partial_sdu_len > pi->sdu_len) + goto drop; + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + + break; + + case L2CAP_SDU_END: + if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) + goto disconnect; + + if (!pi->sdu) + goto disconnect; + + if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { + pi->partial_sdu_len += skb->len; + + if (pi->partial_sdu_len > pi->imtu) + goto drop; + + if (pi->partial_sdu_len != pi->sdu_len) + goto drop; + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + } + + _skb = skb_clone(pi->sdu, GFP_ATOMIC); + if (!_skb) { + pi->conn_state |= L2CAP_CONN_SAR_RETRY; + return -ENOMEM; + } + + err = sock_queue_rcv_skb(sk, _skb); + if (err < 0) { + kfree_skb(_skb); + pi->conn_state |= L2CAP_CONN_SAR_RETRY; + return err; + } + + pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; + pi->conn_state &= ~L2CAP_CONN_SAR_SDU; + + kfree_skb(pi->sdu); + break; + } + + kfree_skb(skb); + return 0; + +drop: + kfree_skb(pi->sdu); + pi->sdu = NULL; + +disconnect: + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + kfree_skb(skb); + return 0; +} + +static int l2cap_try_push_rx_skb(struct sock *sk) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *skb; + u16 control; + int err; + + while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { + control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; + err = l2cap_ertm_reassembly_sdu(sk, skb, control); + if (err < 0) { + skb_queue_head(BUSY_QUEUE(sk), skb); + return -EBUSY; + } + + pi->buffer_seq = (pi->buffer_seq + 1) % 64; + } + + if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) + goto done; + + control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; + l2cap_send_sframe(pi, control); + l2cap_pi(sk)->retry_count = 1; + + del_timer(&pi->retrans_timer); + __mod_monitor_timer(); + + l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; + +done: + pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; + pi->conn_state &= ~L2CAP_CONN_RNR_SENT; + + BT_DBG("sk %p, Exit local busy", sk); + + return 0; +} + +static void l2cap_busy_work(struct work_struct *work) +{ + DECLARE_WAITQUEUE(wait, current); + struct l2cap_pinfo *pi = + container_of(work, struct l2cap_pinfo, busy_work); + struct sock *sk = (struct sock *)pi; + int n_tries = 0, timeo = HZ/5, err; + struct sk_buff *skb; + + lock_sock(sk); + + add_wait_queue(sk_sleep(sk), &wait); + while ((skb = skb_peek(BUSY_QUEUE(sk)))) { + set_current_state(TASK_INTERRUPTIBLE); + + if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { + err = -EBUSY; + l2cap_send_disconn_req(pi->conn, sk, EBUSY); + break; + } + + if (!timeo) + timeo = HZ/5; + + if (signal_pending(current)) { + err = sock_intr_errno(timeo); + break; + } + + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock(sk); + + err = sock_error(sk); + if (err) + break; + + if (l2cap_try_push_rx_skb(sk) == 0) + break; + } + + set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + + release_sock(sk); +} + +static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + int sctrl, err; + + if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { + bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; + __skb_queue_tail(BUSY_QUEUE(sk), skb); + return l2cap_try_push_rx_skb(sk); + + + } + + err = l2cap_ertm_reassembly_sdu(sk, skb, control); + if (err >= 0) { + pi->buffer_seq = (pi->buffer_seq + 1) % 64; + return err; + } + + /* Busy Condition */ + BT_DBG("sk %p, Enter local busy", sk); + + pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; + bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; + __skb_queue_tail(BUSY_QUEUE(sk), skb); + + sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + sctrl |= L2CAP_SUPER_RCV_NOT_READY; + l2cap_send_sframe(pi, sctrl); + + pi->conn_state |= L2CAP_CONN_RNR_SENT; + + del_timer(&pi->ack_timer); + + queue_work(_busy_wq, &pi->busy_work); + + return err; +} + +static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *_skb; + int err = -EINVAL; + + /* + * TODO: We have to notify the userland if some data is lost with the + * Streaming Mode. + */ + + switch (control & L2CAP_CTRL_SAR) { + case L2CAP_SDU_UNSEGMENTED: + if (pi->conn_state & L2CAP_CONN_SAR_SDU) { + kfree_skb(pi->sdu); + break; + } + + err = sock_queue_rcv_skb(sk, skb); + if (!err) + return 0; + + break; + + case L2CAP_SDU_START: + if (pi->conn_state & L2CAP_CONN_SAR_SDU) { + kfree_skb(pi->sdu); + break; + } + + pi->sdu_len = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + + if (pi->sdu_len > pi->imtu) { + err = -EMSGSIZE; + break; + } + + pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); + if (!pi->sdu) { + err = -ENOMEM; + break; + } + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + + pi->conn_state |= L2CAP_CONN_SAR_SDU; + pi->partial_sdu_len = skb->len; + err = 0; + break; + + case L2CAP_SDU_CONTINUE: + if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) + break; + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + + pi->partial_sdu_len += skb->len; + if (pi->partial_sdu_len > pi->sdu_len) + kfree_skb(pi->sdu); + else + err = 0; + + break; + + case L2CAP_SDU_END: + if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) + break; + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + + pi->conn_state &= ~L2CAP_CONN_SAR_SDU; + pi->partial_sdu_len += skb->len; + + if (pi->partial_sdu_len > pi->imtu) + goto drop; + + if (pi->partial_sdu_len == pi->sdu_len) { + _skb = skb_clone(pi->sdu, GFP_ATOMIC); + err = sock_queue_rcv_skb(sk, _skb); + if (err < 0) + kfree_skb(_skb); + } + err = 0; + +drop: + kfree_skb(pi->sdu); + break; + } + + kfree_skb(skb); + return err; +} + +static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) +{ + struct sk_buff *skb; + u16 control; + + while ((skb = skb_peek(SREJ_QUEUE(sk)))) { + if (bt_cb(skb)->tx_seq != tx_seq) + break; + + skb = skb_dequeue(SREJ_QUEUE(sk)); + control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; + l2cap_ertm_reassembly_sdu(sk, skb, control); + l2cap_pi(sk)->buffer_seq_srej = + (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; + tx_seq = (tx_seq + 1) % 64; + } +} + +static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct srej_list *l, *tmp; + u16 control; + + list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { + if (l->tx_seq == tx_seq) { + list_del(&l->list); + kfree(l); + return; + } + control = L2CAP_SUPER_SELECT_REJECT; + control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; + l2cap_send_sframe(pi, control); + list_del(&l->list); + list_add_tail(&l->list, SREJ_LIST(sk)); + } +} + +static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct srej_list *new; + u16 control; + + while (tx_seq != pi->expected_tx_seq) { + control = L2CAP_SUPER_SELECT_REJECT; + control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; + l2cap_send_sframe(pi, control); + + new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); + new->tx_seq = pi->expected_tx_seq; + pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; + list_add_tail(&new->list, SREJ_LIST(sk)); + } + pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; +} + +static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u8 tx_seq = __get_txseq(rx_control); + u8 req_seq = __get_reqseq(rx_control); + u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; + int tx_seq_offset, expected_tx_seq_offset; + int num_to_ack = (pi->tx_win/6) + 1; + int err = 0; + + BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, + rx_control); + + if (L2CAP_CTRL_FINAL & rx_control && + l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { + del_timer(&pi->monitor_timer); + if (pi->unacked_frames > 0) + __mod_retrans_timer(); + pi->conn_state &= ~L2CAP_CONN_WAIT_F; + } + + pi->expected_ack_seq = req_seq; + l2cap_drop_acked_frames(sk); + + if (tx_seq == pi->expected_tx_seq) + goto expected; + + tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; + if (tx_seq_offset < 0) + tx_seq_offset += 64; + + /* invalid tx_seq */ + if (tx_seq_offset >= pi->tx_win) { + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + goto drop; + } + + if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) + goto drop; + + if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { + struct srej_list *first; + + first = list_first_entry(SREJ_LIST(sk), + struct srej_list, list); + if (tx_seq == first->tx_seq) { + l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); + l2cap_check_srej_gap(sk, tx_seq); + + list_del(&first->list); + kfree(first); + + if (list_empty(SREJ_LIST(sk))) { + pi->buffer_seq = pi->buffer_seq_srej; + pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; + l2cap_send_ack(pi); + BT_DBG("sk %p, Exit SREJ_SENT", sk); + } + } else { + struct srej_list *l; + + /* duplicated tx_seq */ + if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) + goto drop; + + list_for_each_entry(l, SREJ_LIST(sk), list) { + if (l->tx_seq == tx_seq) { + l2cap_resend_srejframe(sk, tx_seq); + return 0; + } + } + l2cap_send_srejframe(sk, tx_seq); + } + } else { + expected_tx_seq_offset = + (pi->expected_tx_seq - pi->buffer_seq) % 64; + if (expected_tx_seq_offset < 0) + expected_tx_seq_offset += 64; + + /* duplicated tx_seq */ + if (tx_seq_offset < expected_tx_seq_offset) + goto drop; + + pi->conn_state |= L2CAP_CONN_SREJ_SENT; + + BT_DBG("sk %p, Enter SREJ", sk); + + INIT_LIST_HEAD(SREJ_LIST(sk)); + pi->buffer_seq_srej = pi->buffer_seq; + + __skb_queue_head_init(SREJ_QUEUE(sk)); + __skb_queue_head_init(BUSY_QUEUE(sk)); + l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); + + pi->conn_state |= L2CAP_CONN_SEND_PBIT; + + l2cap_send_srejframe(sk, tx_seq); + + del_timer(&pi->ack_timer); + } + return 0; + +expected: + pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; + + if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { + bt_cb(skb)->tx_seq = tx_seq; + bt_cb(skb)->sar = sar; + __skb_queue_tail(SREJ_QUEUE(sk), skb); + return 0; + } + + err = l2cap_push_rx_skb(sk, skb, rx_control); + if (err < 0) + return 0; + + if (rx_control & L2CAP_CTRL_FINAL) { + if (pi->conn_state & L2CAP_CONN_REJ_ACT) + pi->conn_state &= ~L2CAP_CONN_REJ_ACT; + else + l2cap_retransmit_frames(sk); + } + + __mod_ack_timer(); + + pi->num_acked = (pi->num_acked + 1) % num_to_ack; + if (pi->num_acked == num_to_ack - 1) + l2cap_send_ack(pi); + + return 0; + +drop: + kfree_skb(skb); + return 0; +} + +static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + + BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), + rx_control); + + pi->expected_ack_seq = __get_reqseq(rx_control); + l2cap_drop_acked_frames(sk); + + if (rx_control & L2CAP_CTRL_POLL) { + pi->conn_state |= L2CAP_CONN_SEND_FBIT; + if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { + if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && + (pi->unacked_frames > 0)) + __mod_retrans_timer(); + + pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + l2cap_send_srejtail(sk); + } else { + l2cap_send_i_or_rr_or_rnr(sk); + } + + } else if (rx_control & L2CAP_CTRL_FINAL) { + pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + + if (pi->conn_state & L2CAP_CONN_REJ_ACT) + pi->conn_state &= ~L2CAP_CONN_REJ_ACT; + else + l2cap_retransmit_frames(sk); + + } else { + if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && + (pi->unacked_frames > 0)) + __mod_retrans_timer(); + + pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { + l2cap_send_ack(pi); + } else { + l2cap_ertm_send(sk); + } + } +} + +static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u8 tx_seq = __get_reqseq(rx_control); + + BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); + + pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + + pi->expected_ack_seq = tx_seq; + l2cap_drop_acked_frames(sk); + + if (rx_control & L2CAP_CTRL_FINAL) { + if (pi->conn_state & L2CAP_CONN_REJ_ACT) + pi->conn_state &= ~L2CAP_CONN_REJ_ACT; + else + l2cap_retransmit_frames(sk); + } else { + l2cap_retransmit_frames(sk); + + if (pi->conn_state & L2CAP_CONN_WAIT_F) + pi->conn_state |= L2CAP_CONN_REJ_ACT; + } +} +static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u8 tx_seq = __get_reqseq(rx_control); + + BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); + + pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + + if (rx_control & L2CAP_CTRL_POLL) { + pi->expected_ack_seq = tx_seq; + l2cap_drop_acked_frames(sk); + + pi->conn_state |= L2CAP_CONN_SEND_FBIT; + l2cap_retransmit_one_frame(sk, tx_seq); + + l2cap_ertm_send(sk); + + if (pi->conn_state & L2CAP_CONN_WAIT_F) { + pi->srej_save_reqseq = tx_seq; + pi->conn_state |= L2CAP_CONN_SREJ_ACT; + } + } else if (rx_control & L2CAP_CTRL_FINAL) { + if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && + pi->srej_save_reqseq == tx_seq) + pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; + else + l2cap_retransmit_one_frame(sk, tx_seq); + } else { + l2cap_retransmit_one_frame(sk, tx_seq); + if (pi->conn_state & L2CAP_CONN_WAIT_F) { + pi->srej_save_reqseq = tx_seq; + pi->conn_state |= L2CAP_CONN_SREJ_ACT; + } + } +} + +static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u8 tx_seq = __get_reqseq(rx_control); + + BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); + + pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; + pi->expected_ack_seq = tx_seq; + l2cap_drop_acked_frames(sk); + + if (rx_control & L2CAP_CTRL_POLL) + pi->conn_state |= L2CAP_CONN_SEND_FBIT; + + if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { + del_timer(&pi->retrans_timer); + if (rx_control & L2CAP_CTRL_POLL) + l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); + return; + } + + if (rx_control & L2CAP_CTRL_POLL) + l2cap_send_srejtail(sk); + else + l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); +} + +static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) +{ + BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); + + if (L2CAP_CTRL_FINAL & rx_control && + l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { + del_timer(&l2cap_pi(sk)->monitor_timer); + if (l2cap_pi(sk)->unacked_frames > 0) + __mod_retrans_timer(); + l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; + } + + switch (rx_control & L2CAP_CTRL_SUPERVISE) { + case L2CAP_SUPER_RCV_READY: + l2cap_data_channel_rrframe(sk, rx_control); + break; + + case L2CAP_SUPER_REJECT: + l2cap_data_channel_rejframe(sk, rx_control); + break; + + case L2CAP_SUPER_SELECT_REJECT: + l2cap_data_channel_srejframe(sk, rx_control); + break; + + case L2CAP_SUPER_RCV_NOT_READY: + l2cap_data_channel_rnrframe(sk, rx_control); + break; + } + + kfree_skb(skb); + return 0; +} + +static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u16 control; + u8 req_seq; + int len, next_tx_seq_offset, req_seq_offset; + + control = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + len = skb->len; + + /* + * We can just drop the corrupted I-frame here. + * Receiver will miss it and start proper recovery + * procedures and ask retransmission. + */ + if (l2cap_check_fcs(pi, skb)) + goto drop; + + if (__is_sar_start(control) && __is_iframe(control)) + len -= 2; + + if (pi->fcs == L2CAP_FCS_CRC16) + len -= 2; + + if (len > pi->mps) { + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + goto drop; + } + + req_seq = __get_reqseq(control); + req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; + if (req_seq_offset < 0) + req_seq_offset += 64; + + next_tx_seq_offset = + (pi->next_tx_seq - pi->expected_ack_seq) % 64; + if (next_tx_seq_offset < 0) + next_tx_seq_offset += 64; + + /* check for invalid req-seq */ + if (req_seq_offset > next_tx_seq_offset) { + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + goto drop; + } + + if (__is_iframe(control)) { + if (len < 0) { + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + goto drop; + } + + l2cap_data_channel_iframe(sk, control, skb); + } else { + if (len != 0) { + BT_ERR("%d", len); + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + goto drop; + } + + l2cap_data_channel_sframe(sk, control, skb); + } + + return 0; + +drop: + kfree_skb(skb); + return 0; +} + +static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) +{ + struct sock *sk; + struct l2cap_pinfo *pi; + u16 control; + u8 tx_seq; + int len; + + sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); + if (!sk) { + BT_DBG("unknown cid 0x%4.4x", cid); + goto drop; + } + + pi = l2cap_pi(sk); + + BT_DBG("sk %p, len %d", sk, skb->len); + + if (sk->sk_state != BT_CONNECTED) + goto drop; + + switch (pi->mode) { + case L2CAP_MODE_BASIC: + /* If socket recv buffers overflows we drop data here + * which is *bad* because L2CAP has to be reliable. + * But we don't have any other choice. L2CAP doesn't + * provide flow control mechanism. */ + + if (pi->imtu < skb->len) + goto drop; + + if (!sock_queue_rcv_skb(sk, skb)) + goto done; + break; + + case L2CAP_MODE_ERTM: + if (!sock_owned_by_user(sk)) { + l2cap_ertm_data_rcv(sk, skb); + } else { + if (sk_add_backlog(sk, skb)) + goto drop; + } + + goto done; + + case L2CAP_MODE_STREAMING: + control = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + len = skb->len; + + if (l2cap_check_fcs(pi, skb)) + goto drop; + + if (__is_sar_start(control)) + len -= 2; + + if (pi->fcs == L2CAP_FCS_CRC16) + len -= 2; + + if (len > pi->mps || len < 0 || __is_sframe(control)) + goto drop; + + tx_seq = __get_txseq(control); + + if (pi->expected_tx_seq == tx_seq) + pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; + else + pi->expected_tx_seq = (tx_seq + 1) % 64; + + l2cap_streaming_reassembly_sdu(sk, skb, control); + + goto done; + + default: + BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); + break; + } + +drop: + kfree_skb(skb); + +done: + if (sk) + bh_unlock_sock(sk); + + return 0; +} + +static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) +{ + struct sock *sk; + + sk = l2cap_get_sock_by_psm(0, psm, conn->src); + if (!sk) + goto drop; + + BT_DBG("sk %p, len %d", sk, skb->len); + + if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) + goto drop; + + if (l2cap_pi(sk)->imtu < skb->len) + goto drop; + + if (!sock_queue_rcv_skb(sk, skb)) + goto done; + +drop: + kfree_skb(skb); + +done: + if (sk) + bh_unlock_sock(sk); + return 0; +} + +static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) +{ + struct l2cap_hdr *lh = (void *) skb->data; + u16 cid, len; + __le16 psm; + + skb_pull(skb, L2CAP_HDR_SIZE); + cid = __le16_to_cpu(lh->cid); + len = __le16_to_cpu(lh->len); + + if (len != skb->len) { + kfree_skb(skb); + return; + } + + BT_DBG("len %d, cid 0x%4.4x", len, cid); + + switch (cid) { + case L2CAP_CID_SIGNALING: + l2cap_sig_channel(conn, skb); + break; + + case L2CAP_CID_CONN_LESS: + psm = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + l2cap_conless_channel(conn, psm, skb); + break; + + default: + l2cap_data_channel(conn, cid, skb); + break; + } +} + +/* ---- L2CAP interface with lower layer (HCI) ---- */ + +static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) +{ + int exact = 0, lm1 = 0, lm2 = 0; + register struct sock *sk; + struct hlist_node *node; + + if (type != ACL_LINK) + return -EINVAL; + + BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); + + /* Find listening sockets and check their link_mode */ + read_lock(&l2cap_sk_list.lock); + sk_for_each(sk, node, &l2cap_sk_list.head) { + if (sk->sk_state != BT_LISTEN) + continue; + + if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { + lm1 |= HCI_LM_ACCEPT; + if (l2cap_pi(sk)->role_switch) + lm1 |= HCI_LM_MASTER; + exact++; + } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { + lm2 |= HCI_LM_ACCEPT; + if (l2cap_pi(sk)->role_switch) + lm2 |= HCI_LM_MASTER; + } + } + read_unlock(&l2cap_sk_list.lock); + + return exact ? lm1 : lm2; +} + +static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) +{ + struct l2cap_conn *conn; + + BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); + + if (hcon->type != ACL_LINK) + return -EINVAL; + + if (!status) { + conn = l2cap_conn_add(hcon, status); + if (conn) + l2cap_conn_ready(conn); + } else + l2cap_conn_del(hcon, bt_err(status)); + + return 0; +} + +static int l2cap_disconn_ind(struct hci_conn *hcon) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + + BT_DBG("hcon %p", hcon); + + if (hcon->type != ACL_LINK || !conn) + return 0x13; + + return conn->disc_reason; +} + +static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) +{ + BT_DBG("hcon %p reason %d", hcon, reason); + + if (hcon->type != ACL_LINK) + return -EINVAL; + + l2cap_conn_del(hcon, bt_err(reason)); + + return 0; +} + +static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) +{ + if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) + return; + + if (encrypt == 0x00) { + if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ * 5); + } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) + __l2cap_sock_close(sk, ECONNREFUSED); + } else { + if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) + l2cap_sock_clear_timer(sk); + } +} + +static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) +{ + struct l2cap_chan_list *l; + struct l2cap_conn *conn = hcon->l2cap_data; + struct sock *sk; + + if (!conn) + return 0; + + l = &conn->chan_list; + + BT_DBG("conn %p", conn); + + read_lock(&l->lock); + + for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { + bh_lock_sock(sk); + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { + bh_unlock_sock(sk); + continue; + } + + if (!status && (sk->sk_state == BT_CONNECTED || + sk->sk_state == BT_CONFIG)) { + l2cap_check_encryption(sk, encrypt); + bh_unlock_sock(sk); + continue; + } + + if (sk->sk_state == BT_CONNECT) { + if (!status) { + struct l2cap_conn_req req; + req.scid = cpu_to_le16(l2cap_pi(sk)->scid); + req.psm = l2cap_pi(sk)->psm; + + l2cap_pi(sk)->ident = l2cap_get_ident(conn); + l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; + + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_REQ, sizeof(req), &req); + } else { + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ / 10); + } + } else if (sk->sk_state == BT_CONNECT2) { + struct l2cap_conn_rsp rsp; + __u16 result; + + if (!status) { + sk->sk_state = BT_CONFIG; + result = L2CAP_CR_SUCCESS; + } else { + sk->sk_state = BT_DISCONN; + l2cap_sock_set_timer(sk, HZ / 10); + result = L2CAP_CR_SEC_BLOCK; + } + + rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); + rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); + rsp.result = cpu_to_le16(result); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_RSP, sizeof(rsp), &rsp); + } + + bh_unlock_sock(sk); + } + + read_unlock(&l->lock); + + return 0; +} + +static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + + if (!conn && !(conn = l2cap_conn_add(hcon, 0))) + goto drop; + + BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); + + if (flags & ACL_START) { + struct l2cap_hdr *hdr; + int len; + + if (conn->rx_len) { + BT_ERR("Unexpected start frame (len %d)", skb->len); + kfree_skb(conn->rx_skb); + conn->rx_skb = NULL; + conn->rx_len = 0; + l2cap_conn_unreliable(conn, ECOMM); + } + + if (skb->len < 2) { + BT_ERR("Frame is too short (len %d)", skb->len); + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + hdr = (struct l2cap_hdr *) skb->data; + len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; + + if (len == skb->len) { + /* Complete frame received */ + l2cap_recv_frame(conn, skb); + return 0; + } + + BT_DBG("Start: total len %d, frag len %d", len, skb->len); + + if (skb->len > len) { + BT_ERR("Frame is too long (len %d, expected len %d)", + skb->len, len); + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + /* Allocate skb for the complete frame (with header) */ + conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); + if (!conn->rx_skb) + goto drop; + + skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), + skb->len); + conn->rx_len = len - skb->len; + } else { + BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); + + if (!conn->rx_len) { + BT_ERR("Unexpected continuation frame (len %d)", skb->len); + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + if (skb->len > conn->rx_len) { + BT_ERR("Fragment is too long (len %d, expected %d)", + skb->len, conn->rx_len); + kfree_skb(conn->rx_skb); + conn->rx_skb = NULL; + conn->rx_len = 0; + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), + skb->len); + conn->rx_len -= skb->len; + + if (!conn->rx_len) { + /* Complete frame received */ + l2cap_recv_frame(conn, conn->rx_skb); + conn->rx_skb = NULL; + } + } + +drop: + kfree_skb(skb); + return 0; +} + +static int l2cap_debugfs_show(struct seq_file *f, void *p) +{ + struct sock *sk; + struct hlist_node *node; + + read_lock_bh(&l2cap_sk_list.lock); + + sk_for_each(sk, node, &l2cap_sk_list.head) { + struct l2cap_pinfo *pi = l2cap_pi(sk); + + seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", + batostr(&bt_sk(sk)->src), + batostr(&bt_sk(sk)->dst), + sk->sk_state, __le16_to_cpu(pi->psm), + pi->scid, pi->dcid, + pi->imtu, pi->omtu, pi->sec_level); + } + + read_unlock_bh(&l2cap_sk_list.lock); + + return 0; +} + +static int l2cap_debugfs_open(struct inode *inode, struct file *file) +{ + return single_open(file, l2cap_debugfs_show, inode->i_private); +} + +static const struct file_operations l2cap_debugfs_fops = { + .open = l2cap_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct dentry *l2cap_debugfs; + +static const struct proto_ops l2cap_sock_ops = { + .family = PF_BLUETOOTH, + .owner = THIS_MODULE, + .release = l2cap_sock_release, + .bind = l2cap_sock_bind, + .connect = l2cap_sock_connect, + .listen = l2cap_sock_listen, + .accept = l2cap_sock_accept, + .getname = l2cap_sock_getname, + .sendmsg = l2cap_sock_sendmsg, + .recvmsg = l2cap_sock_recvmsg, + .poll = bt_sock_poll, + .ioctl = bt_sock_ioctl, + .mmap = sock_no_mmap, + .socketpair = sock_no_socketpair, + .shutdown = l2cap_sock_shutdown, + .setsockopt = l2cap_sock_setsockopt, + .getsockopt = l2cap_sock_getsockopt +}; + +static const struct net_proto_family l2cap_sock_family_ops = { + .family = PF_BLUETOOTH, + .owner = THIS_MODULE, + .create = l2cap_sock_create, +}; + +static struct hci_proto l2cap_hci_proto = { + .name = "L2CAP", + .id = HCI_PROTO_L2CAP, + .connect_ind = l2cap_connect_ind, + .connect_cfm = l2cap_connect_cfm, + .disconn_ind = l2cap_disconn_ind, + .disconn_cfm = l2cap_disconn_cfm, + .security_cfm = l2cap_security_cfm, + .recv_acldata = l2cap_recv_acldata +}; + +static int __init l2cap_init(void) +{ + int err; + + err = proto_register(&l2cap_proto, 0); + if (err < 0) + return err; + + _busy_wq = create_singlethread_workqueue("l2cap"); + if (!_busy_wq) + goto error; + + err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); + if (err < 0) { + BT_ERR("L2CAP socket registration failed"); + goto error; + } + + err = hci_register_proto(&l2cap_hci_proto); + if (err < 0) { + BT_ERR("L2CAP protocol registration failed"); + bt_sock_unregister(BTPROTO_L2CAP); + goto error; + } + + if (bt_debugfs) { + l2cap_debugfs = debugfs_create_file("l2cap", 0444, + bt_debugfs, NULL, &l2cap_debugfs_fops); + if (!l2cap_debugfs) + BT_ERR("Failed to create L2CAP debug file"); + } + + BT_INFO("L2CAP ver %s", VERSION); + BT_INFO("L2CAP socket layer initialized"); + + return 0; + +error: + proto_unregister(&l2cap_proto); + return err; +} + +static void __exit l2cap_exit(void) +{ + debugfs_remove(l2cap_debugfs); + + flush_workqueue(_busy_wq); + destroy_workqueue(_busy_wq); + + if (bt_sock_unregister(BTPROTO_L2CAP) < 0) + BT_ERR("L2CAP socket unregistration failed"); + + if (hci_unregister_proto(&l2cap_hci_proto) < 0) + BT_ERR("L2CAP protocol unregistration failed"); + + proto_unregister(&l2cap_proto); +} + +void l2cap_load(void) +{ + /* Dummy function to trigger automatic L2CAP module loading by + * other modules that use L2CAP sockets but don't use any other + * symbols from it. */ +} +EXPORT_SYMBOL(l2cap_load); + +module_init(l2cap_init); +module_exit(l2cap_exit); + +module_param(enable_ertm, bool, 0644); +MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); + +MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); +MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); +MODULE_VERSION(VERSION); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("bt-proto-0"); -- 1.7.1 ^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH 4/5] Bluetooth: Prepare l2cap for split 2010-07-13 14:57 ` [PATCH 3/5] Bluetooth: create a l2cap dir Gustavo F. Padovan @ 2010-07-13 14:57 ` Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 5/5] Bluetooth: first move for L2CAP split Gustavo F. Padovan 2010-07-13 17:13 ` [PATCH 3/5] Bluetooth: create a l2cap dir Marcel Holtmann 1 sibling, 1 reply; 9+ messages in thread From: Gustavo F. Padovan @ 2010-07-13 14:57 UTC (permalink / raw) To: linux-bluetooth; +Cc: marcel, Gustavo F. Padovan From: Gustavo F. Padovan <padovan@profusion.mobi> Move the whole l2cap.c file to core.c and create a dummy sock.c file. Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> --- net/bluetooth/l2cap/Makefile | 2 + net/bluetooth/l2cap/core.c | 4859 ++++++++++++++++++++++++++++++++++++++++++ net/bluetooth/l2cap/l2cap.c | 4859 ------------------------------------------ net/bluetooth/l2cap/sock.c | 27 + 4 files changed, 4888 insertions(+), 4859 deletions(-) create mode 100644 net/bluetooth/l2cap/core.c delete mode 100644 net/bluetooth/l2cap/l2cap.c create mode 100644 net/bluetooth/l2cap/sock.c diff --git a/net/bluetooth/l2cap/Makefile b/net/bluetooth/l2cap/Makefile index 20c88d2..3dc3e09 100644 --- a/net/bluetooth/l2cap/Makefile +++ b/net/bluetooth/l2cap/Makefile @@ -3,3 +3,5 @@ # obj-$(CONFIG_BT_RFCOMM) += l2cap.o + +l2cap-y := core.o sock.o diff --git a/net/bluetooth/l2cap/core.c b/net/bluetooth/l2cap/core.c new file mode 100644 index 0000000..cdd608d --- /dev/null +++ b/net/bluetooth/l2cap/core.c @@ -0,0 +1,4859 @@ +/* + BlueZ - Bluetooth protocol stack for Linux + Copyright (C) 2000-2001 Qualcomm Incorporated + Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> + + Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as + published by the Free Software Foundation; + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. + IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY + CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + + ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, + COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS + SOFTWARE IS DISCLAIMED. +*/ + +/* Bluetooth L2CAP core and sockets. */ + +#include <linux/module.h> + +#include <linux/types.h> +#include <linux/capability.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/poll.h> +#include <linux/fcntl.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/socket.h> +#include <linux/skbuff.h> +#include <linux/list.h> +#include <linux/device.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> +#include <linux/uaccess.h> +#include <linux/crc16.h> +#include <net/sock.h> + +#include <asm/system.h> +#include <asm/unaligned.h> + +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci_core.h> +#include <net/bluetooth/l2cap.h> + +#define VERSION "2.15" + +static int enable_ertm = 0; + +static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; +static u8 l2cap_fixed_chan[8] = { 0x02, }; + +static const struct proto_ops l2cap_sock_ops; + +static struct workqueue_struct *_busy_wq; + +static struct bt_sock_list l2cap_sk_list = { + .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) +}; + +static void l2cap_busy_work(struct work_struct *work); + +static void __l2cap_sock_close(struct sock *sk, int reason); +static void l2cap_sock_close(struct sock *sk); +static void l2cap_sock_kill(struct sock *sk); + +static int l2cap_build_conf_req(struct sock *sk, void *data); +static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, + u8 code, u8 ident, u16 dlen, void *data); + +static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); + +/* ---- L2CAP timers ---- */ +static void l2cap_sock_timeout(unsigned long arg) +{ + struct sock *sk = (struct sock *) arg; + int reason; + + BT_DBG("sock %p state %d", sk, sk->sk_state); + + bh_lock_sock(sk); + + if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) + reason = ECONNREFUSED; + else if (sk->sk_state == BT_CONNECT && + l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) + reason = ECONNREFUSED; + else + reason = ETIMEDOUT; + + __l2cap_sock_close(sk, reason); + + bh_unlock_sock(sk); + + l2cap_sock_kill(sk); + sock_put(sk); +} + +static void l2cap_sock_set_timer(struct sock *sk, long timeout) +{ + BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); + sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); +} + +static void l2cap_sock_clear_timer(struct sock *sk) +{ + BT_DBG("sock %p state %d", sk, sk->sk_state); + sk_stop_timer(sk, &sk->sk_timer); +} + +/* ---- L2CAP channels ---- */ +static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) +{ + struct sock *s; + for (s = l->head; s; s = l2cap_pi(s)->next_c) { + if (l2cap_pi(s)->dcid == cid) + break; + } + return s; +} + +static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) +{ + struct sock *s; + for (s = l->head; s; s = l2cap_pi(s)->next_c) { + if (l2cap_pi(s)->scid == cid) + break; + } + return s; +} + +/* Find channel with given SCID. + * Returns locked socket */ +static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) +{ + struct sock *s; + read_lock(&l->lock); + s = __l2cap_get_chan_by_scid(l, cid); + if (s) + bh_lock_sock(s); + read_unlock(&l->lock); + return s; +} + +static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) +{ + struct sock *s; + for (s = l->head; s; s = l2cap_pi(s)->next_c) { + if (l2cap_pi(s)->ident == ident) + break; + } + return s; +} + +static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) +{ + struct sock *s; + read_lock(&l->lock); + s = __l2cap_get_chan_by_ident(l, ident); + if (s) + bh_lock_sock(s); + read_unlock(&l->lock); + return s; +} + +static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) +{ + u16 cid = L2CAP_CID_DYN_START; + + for (; cid < L2CAP_CID_DYN_END; cid++) { + if (!__l2cap_get_chan_by_scid(l, cid)) + return cid; + } + + return 0; +} + +static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) +{ + sock_hold(sk); + + if (l->head) + l2cap_pi(l->head)->prev_c = sk; + + l2cap_pi(sk)->next_c = l->head; + l2cap_pi(sk)->prev_c = NULL; + l->head = sk; +} + +static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) +{ + struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; + + write_lock_bh(&l->lock); + if (sk == l->head) + l->head = next; + + if (next) + l2cap_pi(next)->prev_c = prev; + if (prev) + l2cap_pi(prev)->next_c = next; + write_unlock_bh(&l->lock); + + __sock_put(sk); +} + +static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) +{ + struct l2cap_chan_list *l = &conn->chan_list; + + BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, + l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); + + conn->disc_reason = 0x13; + + l2cap_pi(sk)->conn = conn; + + if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { + /* Alloc CID for connection-oriented socket */ + l2cap_pi(sk)->scid = l2cap_alloc_cid(l); + } else if (sk->sk_type == SOCK_DGRAM) { + /* Connectionless socket */ + l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; + l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; + l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; + } else { + /* Raw socket can send/recv signalling messages only */ + l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; + l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; + l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; + } + + __l2cap_chan_link(l, sk); + + if (parent) + bt_accept_enqueue(parent, sk); +} + +/* Delete channel. + * Must be called on the locked socket. */ +static void l2cap_chan_del(struct sock *sk, int err) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct sock *parent = bt_sk(sk)->parent; + + l2cap_sock_clear_timer(sk); + + BT_DBG("sk %p, conn %p, err %d", sk, conn, err); + + if (conn) { + /* Unlink from channel list */ + l2cap_chan_unlink(&conn->chan_list, sk); + l2cap_pi(sk)->conn = NULL; + hci_conn_put(conn->hcon); + } + + sk->sk_state = BT_CLOSED; + sock_set_flag(sk, SOCK_ZAPPED); + + if (err) + sk->sk_err = err; + + if (parent) { + bt_accept_unlink(sk); + parent->sk_data_ready(parent, 0); + } else + sk->sk_state_change(sk); + + skb_queue_purge(TX_QUEUE(sk)); + + if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { + struct srej_list *l, *tmp; + + del_timer(&l2cap_pi(sk)->retrans_timer); + del_timer(&l2cap_pi(sk)->monitor_timer); + del_timer(&l2cap_pi(sk)->ack_timer); + + skb_queue_purge(SREJ_QUEUE(sk)); + skb_queue_purge(BUSY_QUEUE(sk)); + + list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { + list_del(&l->list); + kfree(l); + } + } +} + +/* Service level security */ +static inline int l2cap_check_security(struct sock *sk) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + __u8 auth_type; + + if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { + if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) + auth_type = HCI_AT_NO_BONDING_MITM; + else + auth_type = HCI_AT_NO_BONDING; + + if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) + l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; + } else { + switch (l2cap_pi(sk)->sec_level) { + case BT_SECURITY_HIGH: + auth_type = HCI_AT_GENERAL_BONDING_MITM; + break; + case BT_SECURITY_MEDIUM: + auth_type = HCI_AT_GENERAL_BONDING; + break; + default: + auth_type = HCI_AT_NO_BONDING; + break; + } + } + + return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, + auth_type); +} + +static inline u8 l2cap_get_ident(struct l2cap_conn *conn) +{ + u8 id; + + /* Get next available identificator. + * 1 - 128 are used by kernel. + * 129 - 199 are reserved. + * 200 - 254 are used by utilities like l2ping, etc. + */ + + spin_lock_bh(&conn->lock); + + if (++conn->tx_ident > 128) + conn->tx_ident = 1; + + id = conn->tx_ident; + + spin_unlock_bh(&conn->lock); + + return id; +} + +static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) +{ + struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); + + BT_DBG("code 0x%2.2x", code); + + if (!skb) + return; + + hci_send_acl(conn->hcon, skb, 0); +} + +static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) +{ + struct sk_buff *skb; + struct l2cap_hdr *lh; + struct l2cap_conn *conn = pi->conn; + struct sock *sk = (struct sock *)pi; + int count, hlen = L2CAP_HDR_SIZE + 2; + + if (sk->sk_state != BT_CONNECTED) + return; + + if (pi->fcs == L2CAP_FCS_CRC16) + hlen += 2; + + BT_DBG("pi %p, control 0x%2.2x", pi, control); + + count = min_t(unsigned int, conn->mtu, hlen); + control |= L2CAP_CTRL_FRAME_TYPE; + + if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { + control |= L2CAP_CTRL_FINAL; + pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; + } + + if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { + control |= L2CAP_CTRL_POLL; + pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; + } + + skb = bt_skb_alloc(count, GFP_ATOMIC); + if (!skb) + return; + + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(pi->dcid); + put_unaligned_le16(control, skb_put(skb, 2)); + + if (pi->fcs == L2CAP_FCS_CRC16) { + u16 fcs = crc16(0, (u8 *)lh, count - 2); + put_unaligned_le16(fcs, skb_put(skb, 2)); + } + + hci_send_acl(pi->conn->hcon, skb, 0); +} + +static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) +{ + if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { + control |= L2CAP_SUPER_RCV_NOT_READY; + pi->conn_state |= L2CAP_CONN_RNR_SENT; + } else + control |= L2CAP_SUPER_RCV_READY; + + control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + l2cap_send_sframe(pi, control); +} + +static inline int __l2cap_no_conn_pending(struct sock *sk) +{ + return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); +} + +static void l2cap_do_start(struct sock *sk) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + + if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { + if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) + return; + + if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { + struct l2cap_conn_req req; + req.scid = cpu_to_le16(l2cap_pi(sk)->scid); + req.psm = l2cap_pi(sk)->psm; + + l2cap_pi(sk)->ident = l2cap_get_ident(conn); + l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; + + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_REQ, sizeof(req), &req); + } + } else { + struct l2cap_info_req req; + req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; + conn->info_ident = l2cap_get_ident(conn); + + mod_timer(&conn->info_timer, jiffies + + msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); + + l2cap_send_cmd(conn, conn->info_ident, + L2CAP_INFO_REQ, sizeof(req), &req); + } +} + +static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) +{ + u32 local_feat_mask = l2cap_feat_mask; + if (enable_ertm) + local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; + + switch (mode) { + case L2CAP_MODE_ERTM: + return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; + case L2CAP_MODE_STREAMING: + return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; + default: + return 0x00; + } +} + +static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) +{ + struct l2cap_disconn_req req; + + if (!conn) + return; + + skb_queue_purge(TX_QUEUE(sk)); + + if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { + del_timer(&l2cap_pi(sk)->retrans_timer); + del_timer(&l2cap_pi(sk)->monitor_timer); + del_timer(&l2cap_pi(sk)->ack_timer); + } + + req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); + req.scid = cpu_to_le16(l2cap_pi(sk)->scid); + l2cap_send_cmd(conn, l2cap_get_ident(conn), + L2CAP_DISCONN_REQ, sizeof(req), &req); + + sk->sk_state = BT_DISCONN; + sk->sk_err = err; +} + +/* ---- L2CAP connections ---- */ +static void l2cap_conn_start(struct l2cap_conn *conn) +{ + struct l2cap_chan_list *l = &conn->chan_list; + struct sock_del_list del, *tmp1, *tmp2; + struct sock *sk; + + BT_DBG("conn %p", conn); + + INIT_LIST_HEAD(&del.list); + + read_lock(&l->lock); + + for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { + bh_lock_sock(sk); + + if (sk->sk_type != SOCK_SEQPACKET && + sk->sk_type != SOCK_STREAM) { + bh_unlock_sock(sk); + continue; + } + + if (sk->sk_state == BT_CONNECT) { + struct l2cap_conn_req req; + + if (!l2cap_check_security(sk) || + !__l2cap_no_conn_pending(sk)) { + bh_unlock_sock(sk); + continue; + } + + if (!l2cap_mode_supported(l2cap_pi(sk)->mode, + conn->feat_mask) + && l2cap_pi(sk)->conf_state & + L2CAP_CONF_STATE2_DEVICE) { + tmp1 = kzalloc(sizeof(struct sock_del_list), + GFP_ATOMIC); + tmp1->sk = sk; + list_add_tail(&tmp1->list, &del.list); + bh_unlock_sock(sk); + continue; + } + + req.scid = cpu_to_le16(l2cap_pi(sk)->scid); + req.psm = l2cap_pi(sk)->psm; + + l2cap_pi(sk)->ident = l2cap_get_ident(conn); + l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; + + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_REQ, sizeof(req), &req); + + } else if (sk->sk_state == BT_CONNECT2) { + struct l2cap_conn_rsp rsp; + char buf[128]; + rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); + rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); + + if (l2cap_check_security(sk)) { + if (bt_sk(sk)->defer_setup) { + struct sock *parent = bt_sk(sk)->parent; + rsp.result = cpu_to_le16(L2CAP_CR_PEND); + rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); + parent->sk_data_ready(parent, 0); + + } else { + sk->sk_state = BT_CONFIG; + rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + } + } else { + rsp.result = cpu_to_le16(L2CAP_CR_PEND); + rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); + } + + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_RSP, sizeof(rsp), &rsp); + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || + rsp.result != L2CAP_CR_SUCCESS) { + bh_unlock_sock(sk); + continue; + } + + l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(sk, buf), buf); + l2cap_pi(sk)->num_conf_req++; + } + + bh_unlock_sock(sk); + } + + read_unlock(&l->lock); + + list_for_each_entry_safe(tmp1, tmp2, &del.list, list) { + bh_lock_sock(tmp1->sk); + __l2cap_sock_close(tmp1->sk, ECONNRESET); + bh_unlock_sock(tmp1->sk); + list_del(&tmp1->list); + kfree(tmp1); + } +} + +static void l2cap_conn_ready(struct l2cap_conn *conn) +{ + struct l2cap_chan_list *l = &conn->chan_list; + struct sock *sk; + + BT_DBG("conn %p", conn); + + read_lock(&l->lock); + + for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { + bh_lock_sock(sk); + + if (sk->sk_type != SOCK_SEQPACKET && + sk->sk_type != SOCK_STREAM) { + l2cap_sock_clear_timer(sk); + sk->sk_state = BT_CONNECTED; + sk->sk_state_change(sk); + } else if (sk->sk_state == BT_CONNECT) + l2cap_do_start(sk); + + bh_unlock_sock(sk); + } + + read_unlock(&l->lock); +} + +/* Notify sockets that we cannot guaranty reliability anymore */ +static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) +{ + struct l2cap_chan_list *l = &conn->chan_list; + struct sock *sk; + + BT_DBG("conn %p", conn); + + read_lock(&l->lock); + + for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { + if (l2cap_pi(sk)->force_reliable) + sk->sk_err = err; + } + + read_unlock(&l->lock); +} + +static void l2cap_info_timeout(unsigned long arg) +{ + struct l2cap_conn *conn = (void *) arg; + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); +} + +static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + + if (conn || status) + return conn; + + conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); + if (!conn) + return NULL; + + hcon->l2cap_data = conn; + conn->hcon = hcon; + + BT_DBG("hcon %p conn %p", hcon, conn); + + conn->mtu = hcon->hdev->acl_mtu; + conn->src = &hcon->hdev->bdaddr; + conn->dst = &hcon->dst; + + conn->feat_mask = 0; + + spin_lock_init(&conn->lock); + rwlock_init(&conn->chan_list.lock); + + setup_timer(&conn->info_timer, l2cap_info_timeout, + (unsigned long) conn); + + conn->disc_reason = 0x13; + + return conn; +} + +static void l2cap_conn_del(struct hci_conn *hcon, int err) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + struct sock *sk; + + if (!conn) + return; + + BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); + + kfree_skb(conn->rx_skb); + + /* Kill channels */ + while ((sk = conn->chan_list.head)) { + bh_lock_sock(sk); + l2cap_chan_del(sk, err); + bh_unlock_sock(sk); + l2cap_sock_kill(sk); + } + + if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) + del_timer_sync(&conn->info_timer); + + hcon->l2cap_data = NULL; + kfree(conn); +} + +static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) +{ + struct l2cap_chan_list *l = &conn->chan_list; + write_lock_bh(&l->lock); + __l2cap_chan_add(conn, sk, parent); + write_unlock_bh(&l->lock); +} + +/* ---- Socket interface ---- */ +static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) +{ + struct sock *sk; + struct hlist_node *node; + sk_for_each(sk, node, &l2cap_sk_list.head) + if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) + goto found; + sk = NULL; +found: + return sk; +} + +/* Find socket with psm and source bdaddr. + * Returns closest match. + */ +static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) +{ + struct sock *sk = NULL, *sk1 = NULL; + struct hlist_node *node; + + sk_for_each(sk, node, &l2cap_sk_list.head) { + if (state && sk->sk_state != state) + continue; + + if (l2cap_pi(sk)->psm == psm) { + /* Exact match. */ + if (!bacmp(&bt_sk(sk)->src, src)) + break; + + /* Closest match */ + if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) + sk1 = sk; + } + } + return node ? sk : sk1; +} + +/* Find socket with given address (psm, src). + * Returns locked socket */ +static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) +{ + struct sock *s; + read_lock(&l2cap_sk_list.lock); + s = __l2cap_get_sock_by_psm(state, psm, src); + if (s) + bh_lock_sock(s); + read_unlock(&l2cap_sk_list.lock); + return s; +} + +static void l2cap_sock_destruct(struct sock *sk) +{ + BT_DBG("sk %p", sk); + + skb_queue_purge(&sk->sk_receive_queue); + skb_queue_purge(&sk->sk_write_queue); +} + +static void l2cap_sock_cleanup_listen(struct sock *parent) +{ + struct sock *sk; + + BT_DBG("parent %p", parent); + + /* Close not yet accepted channels */ + while ((sk = bt_accept_dequeue(parent, NULL))) + l2cap_sock_close(sk); + + parent->sk_state = BT_CLOSED; + sock_set_flag(parent, SOCK_ZAPPED); +} + +/* Kill socket (only if zapped and orphan) + * Must be called on unlocked socket. + */ +static void l2cap_sock_kill(struct sock *sk) +{ + if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) + return; + + BT_DBG("sk %p state %d", sk, sk->sk_state); + + /* Kill poor orphan */ + bt_sock_unlink(&l2cap_sk_list, sk); + sock_set_flag(sk, SOCK_DEAD); + sock_put(sk); +} + +static void __l2cap_sock_close(struct sock *sk, int reason) +{ + BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); + + switch (sk->sk_state) { + case BT_LISTEN: + l2cap_sock_cleanup_listen(sk); + break; + + case BT_CONNECTED: + case BT_CONFIG: + if (sk->sk_type == SOCK_SEQPACKET || + sk->sk_type == SOCK_STREAM) { + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + + l2cap_sock_set_timer(sk, sk->sk_sndtimeo); + l2cap_send_disconn_req(conn, sk, reason); + } else + l2cap_chan_del(sk, reason); + break; + + case BT_CONNECT2: + if (sk->sk_type == SOCK_SEQPACKET || + sk->sk_type == SOCK_STREAM) { + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct l2cap_conn_rsp rsp; + __u16 result; + + if (bt_sk(sk)->defer_setup) + result = L2CAP_CR_SEC_BLOCK; + else + result = L2CAP_CR_BAD_PSM; + + rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); + rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); + rsp.result = cpu_to_le16(result); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_RSP, sizeof(rsp), &rsp); + } else + l2cap_chan_del(sk, reason); + break; + + case BT_CONNECT: + case BT_DISCONN: + l2cap_chan_del(sk, reason); + break; + + default: + sock_set_flag(sk, SOCK_ZAPPED); + break; + } +} + +/* Must be called on unlocked socket. */ +static void l2cap_sock_close(struct sock *sk) +{ + l2cap_sock_clear_timer(sk); + lock_sock(sk); + __l2cap_sock_close(sk, ECONNRESET); + release_sock(sk); + l2cap_sock_kill(sk); +} + +static void l2cap_sock_init(struct sock *sk, struct sock *parent) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + + BT_DBG("sk %p", sk); + + if (parent) { + sk->sk_type = parent->sk_type; + bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; + + pi->imtu = l2cap_pi(parent)->imtu; + pi->omtu = l2cap_pi(parent)->omtu; + pi->conf_state = l2cap_pi(parent)->conf_state; + pi->mode = l2cap_pi(parent)->mode; + pi->fcs = l2cap_pi(parent)->fcs; + pi->max_tx = l2cap_pi(parent)->max_tx; + pi->tx_win = l2cap_pi(parent)->tx_win; + pi->sec_level = l2cap_pi(parent)->sec_level; + pi->role_switch = l2cap_pi(parent)->role_switch; + pi->force_reliable = l2cap_pi(parent)->force_reliable; + } else { + pi->imtu = L2CAP_DEFAULT_MTU; + pi->omtu = 0; + if (enable_ertm && sk->sk_type == SOCK_STREAM) { + pi->mode = L2CAP_MODE_ERTM; + pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; + } else { + pi->mode = L2CAP_MODE_BASIC; + } + pi->max_tx = L2CAP_DEFAULT_MAX_TX; + pi->fcs = L2CAP_FCS_CRC16; + pi->tx_win = L2CAP_DEFAULT_TX_WINDOW; + pi->sec_level = BT_SECURITY_LOW; + pi->role_switch = 0; + pi->force_reliable = 0; + } + + /* Default config options */ + pi->conf_len = 0; + pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; + skb_queue_head_init(TX_QUEUE(sk)); + skb_queue_head_init(SREJ_QUEUE(sk)); + skb_queue_head_init(BUSY_QUEUE(sk)); + INIT_LIST_HEAD(SREJ_LIST(sk)); +} + +static struct proto l2cap_proto = { + .name = "L2CAP", + .owner = THIS_MODULE, + .obj_size = sizeof(struct l2cap_pinfo) +}; + +static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) +{ + struct sock *sk; + + sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); + if (!sk) + return NULL; + + sock_init_data(sock, sk); + INIT_LIST_HEAD(&bt_sk(sk)->accept_q); + + sk->sk_destruct = l2cap_sock_destruct; + sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); + + sock_reset_flag(sk, SOCK_ZAPPED); + + sk->sk_protocol = proto; + sk->sk_state = BT_OPEN; + + setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); + + bt_sock_link(&l2cap_sk_list, sk); + return sk; +} + +static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, + int kern) +{ + struct sock *sk; + + BT_DBG("sock %p", sock); + + sock->state = SS_UNCONNECTED; + + if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && + sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) + return -ESOCKTNOSUPPORT; + + if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) + return -EPERM; + + sock->ops = &l2cap_sock_ops; + + sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); + if (!sk) + return -ENOMEM; + + l2cap_sock_init(sk, NULL); + return 0; +} + +static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) +{ + struct sock *sk = sock->sk; + struct sockaddr_l2 la; + int len, err = 0; + + BT_DBG("sk %p", sk); + + if (!addr || addr->sa_family != AF_BLUETOOTH) + return -EINVAL; + + memset(&la, 0, sizeof(la)); + len = min_t(unsigned int, sizeof(la), alen); + memcpy(&la, addr, len); + + if (la.l2_cid) + return -EINVAL; + + lock_sock(sk); + + if (sk->sk_state != BT_OPEN) { + err = -EBADFD; + goto done; + } + + if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && + !capable(CAP_NET_BIND_SERVICE)) { + err = -EACCES; + goto done; + } + + write_lock_bh(&l2cap_sk_list.lock); + + if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { + err = -EADDRINUSE; + } else { + /* Save source address */ + bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); + l2cap_pi(sk)->psm = la.l2_psm; + l2cap_pi(sk)->sport = la.l2_psm; + sk->sk_state = BT_BOUND; + + if (__le16_to_cpu(la.l2_psm) == 0x0001 || + __le16_to_cpu(la.l2_psm) == 0x0003) + l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; + } + + write_unlock_bh(&l2cap_sk_list.lock); + +done: + release_sock(sk); + return err; +} + +static int l2cap_do_connect(struct sock *sk) +{ + bdaddr_t *src = &bt_sk(sk)->src; + bdaddr_t *dst = &bt_sk(sk)->dst; + struct l2cap_conn *conn; + struct hci_conn *hcon; + struct hci_dev *hdev; + __u8 auth_type; + int err; + + BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), + l2cap_pi(sk)->psm); + + hdev = hci_get_route(dst, src); + if (!hdev) + return -EHOSTUNREACH; + + hci_dev_lock_bh(hdev); + + err = -ENOMEM; + + if (sk->sk_type == SOCK_RAW) { + switch (l2cap_pi(sk)->sec_level) { + case BT_SECURITY_HIGH: + auth_type = HCI_AT_DEDICATED_BONDING_MITM; + break; + case BT_SECURITY_MEDIUM: + auth_type = HCI_AT_DEDICATED_BONDING; + break; + default: + auth_type = HCI_AT_NO_BONDING; + break; + } + } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { + if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) + auth_type = HCI_AT_NO_BONDING_MITM; + else + auth_type = HCI_AT_NO_BONDING; + + if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) + l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; + } else { + switch (l2cap_pi(sk)->sec_level) { + case BT_SECURITY_HIGH: + auth_type = HCI_AT_GENERAL_BONDING_MITM; + break; + case BT_SECURITY_MEDIUM: + auth_type = HCI_AT_GENERAL_BONDING; + break; + default: + auth_type = HCI_AT_NO_BONDING; + break; + } + } + + hcon = hci_connect(hdev, ACL_LINK, dst, + l2cap_pi(sk)->sec_level, auth_type); + if (!hcon) + goto done; + + conn = l2cap_conn_add(hcon, 0); + if (!conn) { + hci_conn_put(hcon); + goto done; + } + + err = 0; + + /* Update source addr of the socket */ + bacpy(src, conn->src); + + l2cap_chan_add(conn, sk, NULL); + + sk->sk_state = BT_CONNECT; + l2cap_sock_set_timer(sk, sk->sk_sndtimeo); + + if (hcon->state == BT_CONNECTED) { + if (sk->sk_type != SOCK_SEQPACKET && + sk->sk_type != SOCK_STREAM) { + l2cap_sock_clear_timer(sk); + sk->sk_state = BT_CONNECTED; + } else + l2cap_do_start(sk); + } + +done: + hci_dev_unlock_bh(hdev); + hci_dev_put(hdev); + return err; +} + +static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) +{ + struct sock *sk = sock->sk; + struct sockaddr_l2 la; + int len, err = 0; + + BT_DBG("sk %p", sk); + + if (!addr || alen < sizeof(addr->sa_family) || + addr->sa_family != AF_BLUETOOTH) + return -EINVAL; + + memset(&la, 0, sizeof(la)); + len = min_t(unsigned int, sizeof(la), alen); + memcpy(&la, addr, len); + + if (la.l2_cid) + return -EINVAL; + + lock_sock(sk); + + if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) + && !la.l2_psm) { + err = -EINVAL; + goto done; + } + + switch (l2cap_pi(sk)->mode) { + case L2CAP_MODE_BASIC: + break; + case L2CAP_MODE_ERTM: + case L2CAP_MODE_STREAMING: + if (enable_ertm) + break; + /* fall through */ + default: + err = -ENOTSUPP; + goto done; + } + + switch (sk->sk_state) { + case BT_CONNECT: + case BT_CONNECT2: + case BT_CONFIG: + /* Already connecting */ + goto wait; + + case BT_CONNECTED: + /* Already connected */ + err = -EISCONN; + goto done; + + case BT_OPEN: + case BT_BOUND: + /* Can connect */ + break; + + default: + err = -EBADFD; + goto done; + } + + /* Set destination address and psm */ + bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); + l2cap_pi(sk)->psm = la.l2_psm; + + err = l2cap_do_connect(sk); + if (err) + goto done; + +wait: + err = bt_sock_wait_state(sk, BT_CONNECTED, + sock_sndtimeo(sk, flags & O_NONBLOCK)); +done: + release_sock(sk); + return err; +} + +static int l2cap_sock_listen(struct socket *sock, int backlog) +{ + struct sock *sk = sock->sk; + int err = 0; + + BT_DBG("sk %p backlog %d", sk, backlog); + + lock_sock(sk); + + if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) + || sk->sk_state != BT_BOUND) { + err = -EBADFD; + goto done; + } + + switch (l2cap_pi(sk)->mode) { + case L2CAP_MODE_BASIC: + break; + case L2CAP_MODE_ERTM: + case L2CAP_MODE_STREAMING: + if (enable_ertm) + break; + /* fall through */ + default: + err = -ENOTSUPP; + goto done; + } + + if (!l2cap_pi(sk)->psm) { + bdaddr_t *src = &bt_sk(sk)->src; + u16 psm; + + err = -EINVAL; + + write_lock_bh(&l2cap_sk_list.lock); + + for (psm = 0x1001; psm < 0x1100; psm += 2) + if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { + l2cap_pi(sk)->psm = cpu_to_le16(psm); + l2cap_pi(sk)->sport = cpu_to_le16(psm); + err = 0; + break; + } + + write_unlock_bh(&l2cap_sk_list.lock); + + if (err < 0) + goto done; + } + + sk->sk_max_ack_backlog = backlog; + sk->sk_ack_backlog = 0; + sk->sk_state = BT_LISTEN; + +done: + release_sock(sk); + return err; +} + +static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) +{ + DECLARE_WAITQUEUE(wait, current); + struct sock *sk = sock->sk, *nsk; + long timeo; + int err = 0; + + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); + + if (sk->sk_state != BT_LISTEN) { + err = -EBADFD; + goto done; + } + + timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); + + BT_DBG("sk %p timeo %ld", sk, timeo); + + /* Wait for an incoming connection. (wake-one). */ + add_wait_queue_exclusive(sk_sleep(sk), &wait); + while (!(nsk = bt_accept_dequeue(sk, newsock))) { + set_current_state(TASK_INTERRUPTIBLE); + if (!timeo) { + err = -EAGAIN; + break; + } + + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock_nested(sk, SINGLE_DEPTH_NESTING); + + if (sk->sk_state != BT_LISTEN) { + err = -EBADFD; + break; + } + + if (signal_pending(current)) { + err = sock_intr_errno(timeo); + break; + } + } + set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + + if (err) + goto done; + + newsock->state = SS_CONNECTED; + + BT_DBG("new socket %p", nsk); + +done: + release_sock(sk); + return err; +} + +static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) +{ + struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; + struct sock *sk = sock->sk; + + BT_DBG("sock %p, sk %p", sock, sk); + + addr->sa_family = AF_BLUETOOTH; + *len = sizeof(struct sockaddr_l2); + + if (peer) { + la->l2_psm = l2cap_pi(sk)->psm; + bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); + la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); + } else { + la->l2_psm = l2cap_pi(sk)->sport; + bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); + la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); + } + + return 0; +} + +static int __l2cap_wait_ack(struct sock *sk) +{ + DECLARE_WAITQUEUE(wait, current); + int err = 0; + int timeo = HZ/5; + + add_wait_queue(sk_sleep(sk), &wait); + while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { + set_current_state(TASK_INTERRUPTIBLE); + + if (!timeo) + timeo = HZ/5; + + if (signal_pending(current)) { + err = sock_intr_errno(timeo); + break; + } + + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock(sk); + + err = sock_error(sk); + if (err) + break; + } + set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + return err; +} + +static void l2cap_monitor_timeout(unsigned long arg) +{ + struct sock *sk = (void *) arg; + + BT_DBG("sk %p", sk); + + bh_lock_sock(sk); + if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { + l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); + bh_unlock_sock(sk); + return; + } + + l2cap_pi(sk)->retry_count++; + __mod_monitor_timer(); + + l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); + bh_unlock_sock(sk); +} + +static void l2cap_retrans_timeout(unsigned long arg) +{ + struct sock *sk = (void *) arg; + + BT_DBG("sk %p", sk); + + bh_lock_sock(sk); + l2cap_pi(sk)->retry_count = 1; + __mod_monitor_timer(); + + l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; + + l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); + bh_unlock_sock(sk); +} + +static void l2cap_drop_acked_frames(struct sock *sk) +{ + struct sk_buff *skb; + + while ((skb = skb_peek(TX_QUEUE(sk))) && + l2cap_pi(sk)->unacked_frames) { + if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) + break; + + skb = skb_dequeue(TX_QUEUE(sk)); + kfree_skb(skb); + + l2cap_pi(sk)->unacked_frames--; + } + + if (!l2cap_pi(sk)->unacked_frames) + del_timer(&l2cap_pi(sk)->retrans_timer); +} + +static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + + BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); + + hci_send_acl(pi->conn->hcon, skb, 0); +} + +static void l2cap_streaming_send(struct sock *sk) +{ + struct sk_buff *skb, *tx_skb; + struct l2cap_pinfo *pi = l2cap_pi(sk); + u16 control, fcs; + + while ((skb = sk->sk_send_head)) { + tx_skb = skb_clone(skb, GFP_ATOMIC); + + control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); + control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; + put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); + + if (pi->fcs == L2CAP_FCS_CRC16) { + fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); + put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); + } + + l2cap_do_send(sk, tx_skb); + + pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; + + if (skb_queue_is_last(TX_QUEUE(sk), skb)) + sk->sk_send_head = NULL; + else + sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); + + skb = skb_dequeue(TX_QUEUE(sk)); + kfree_skb(skb); + } +} + +static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *skb, *tx_skb; + u16 control, fcs; + + skb = skb_peek(TX_QUEUE(sk)); + if (!skb) + return; + + do { + if (bt_cb(skb)->tx_seq == tx_seq) + break; + + if (skb_queue_is_last(TX_QUEUE(sk), skb)) + return; + + } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); + + if (pi->remote_max_tx && + bt_cb(skb)->retries == pi->remote_max_tx) { + l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); + return; + } + + tx_skb = skb_clone(skb, GFP_ATOMIC); + bt_cb(skb)->retries++; + control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); + + if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { + control |= L2CAP_CTRL_FINAL; + pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; + } + + control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) + | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); + + put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); + + if (pi->fcs == L2CAP_FCS_CRC16) { + fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); + put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); + } + + l2cap_do_send(sk, tx_skb); +} + +static int l2cap_ertm_send(struct sock *sk) +{ + struct sk_buff *skb, *tx_skb; + struct l2cap_pinfo *pi = l2cap_pi(sk); + u16 control, fcs; + int nsent = 0; + + if (sk->sk_state != BT_CONNECTED) + return -ENOTCONN; + + while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { + + if (pi->remote_max_tx && + bt_cb(skb)->retries == pi->remote_max_tx) { + l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); + break; + } + + tx_skb = skb_clone(skb, GFP_ATOMIC); + + bt_cb(skb)->retries++; + + control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); + control &= L2CAP_CTRL_SAR; + + if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { + control |= L2CAP_CTRL_FINAL; + pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; + } + control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) + | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); + put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); + + + if (pi->fcs == L2CAP_FCS_CRC16) { + fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); + put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); + } + + l2cap_do_send(sk, tx_skb); + + __mod_retrans_timer(); + + bt_cb(skb)->tx_seq = pi->next_tx_seq; + pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; + + pi->unacked_frames++; + pi->frames_sent++; + + if (skb_queue_is_last(TX_QUEUE(sk), skb)) + sk->sk_send_head = NULL; + else + sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); + + nsent++; + } + + return nsent; +} + +static int l2cap_retransmit_frames(struct sock *sk) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + int ret; + + if (!skb_queue_empty(TX_QUEUE(sk))) + sk->sk_send_head = TX_QUEUE(sk)->next; + + pi->next_tx_seq = pi->expected_ack_seq; + ret = l2cap_ertm_send(sk); + return ret; +} + +static void l2cap_send_ack(struct l2cap_pinfo *pi) +{ + struct sock *sk = (struct sock *)pi; + u16 control = 0; + + control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { + control |= L2CAP_SUPER_RCV_NOT_READY; + pi->conn_state |= L2CAP_CONN_RNR_SENT; + l2cap_send_sframe(pi, control); + return; + } + + if (l2cap_ertm_send(sk) > 0) + return; + + control |= L2CAP_SUPER_RCV_READY; + l2cap_send_sframe(pi, control); +} + +static void l2cap_send_srejtail(struct sock *sk) +{ + struct srej_list *tail; + u16 control; + + control = L2CAP_SUPER_SELECT_REJECT; + control |= L2CAP_CTRL_FINAL; + + tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); + control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + l2cap_send_sframe(l2cap_pi(sk), control); +} + +static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct sk_buff **frag; + int err, sent = 0; + + if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) + return -EFAULT; + + sent += count; + len -= count; + + /* Continuation fragments (no L2CAP header) */ + frag = &skb_shinfo(skb)->frag_list; + while (len) { + count = min_t(unsigned int, conn->mtu, len); + + *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); + if (!*frag) + return -EFAULT; + if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) + return -EFAULT; + + sent += count; + len -= count; + + frag = &(*frag)->next; + } + + return sent; +} + +static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct sk_buff *skb; + int err, count, hlen = L2CAP_HDR_SIZE + 2; + struct l2cap_hdr *lh; + + BT_DBG("sk %p len %d", sk, (int)len); + + count = min_t(unsigned int, (conn->mtu - hlen), len); + skb = bt_skb_send_alloc(sk, count + hlen, + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) + return ERR_PTR(-ENOMEM); + + /* Create L2CAP header */ + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); + lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); + put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); + + err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); + if (unlikely(err < 0)) { + kfree_skb(skb); + return ERR_PTR(err); + } + return skb; +} + +static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct sk_buff *skb; + int err, count, hlen = L2CAP_HDR_SIZE; + struct l2cap_hdr *lh; + + BT_DBG("sk %p len %d", sk, (int)len); + + count = min_t(unsigned int, (conn->mtu - hlen), len); + skb = bt_skb_send_alloc(sk, count + hlen, + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) + return ERR_PTR(-ENOMEM); + + /* Create L2CAP header */ + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); + lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); + + err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); + if (unlikely(err < 0)) { + kfree_skb(skb); + return ERR_PTR(err); + } + return skb; +} + +static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) +{ + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + struct sk_buff *skb; + int err, count, hlen = L2CAP_HDR_SIZE + 2; + struct l2cap_hdr *lh; + + BT_DBG("sk %p len %d", sk, (int)len); + + if (!conn) + return ERR_PTR(-ENOTCONN); + + if (sdulen) + hlen += 2; + + if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) + hlen += 2; + + count = min_t(unsigned int, (conn->mtu - hlen), len); + skb = bt_skb_send_alloc(sk, count + hlen, + msg->msg_flags & MSG_DONTWAIT, &err); + if (!skb) + return ERR_PTR(-ENOMEM); + + /* Create L2CAP header */ + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); + lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); + put_unaligned_le16(control, skb_put(skb, 2)); + if (sdulen) + put_unaligned_le16(sdulen, skb_put(skb, 2)); + + err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); + if (unlikely(err < 0)) { + kfree_skb(skb); + return ERR_PTR(err); + } + + if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) + put_unaligned_le16(0, skb_put(skb, 2)); + + bt_cb(skb)->retries = 0; + return skb; +} + +static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *skb; + struct sk_buff_head sar_queue; + u16 control; + size_t size = 0; + + skb_queue_head_init(&sar_queue); + control = L2CAP_SDU_START; + skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); + if (IS_ERR(skb)) + return PTR_ERR(skb); + + __skb_queue_tail(&sar_queue, skb); + len -= pi->remote_mps; + size += pi->remote_mps; + + while (len > 0) { + size_t buflen; + + if (len > pi->remote_mps) { + control = L2CAP_SDU_CONTINUE; + buflen = pi->remote_mps; + } else { + control = L2CAP_SDU_END; + buflen = len; + } + + skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); + if (IS_ERR(skb)) { + skb_queue_purge(&sar_queue); + return PTR_ERR(skb); + } + + __skb_queue_tail(&sar_queue, skb); + len -= buflen; + size += buflen; + } + skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); + if (sk->sk_send_head == NULL) + sk->sk_send_head = sar_queue.next; + + return size; +} + +static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) +{ + struct sock *sk = sock->sk; + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *skb; + u16 control; + int err; + + BT_DBG("sock %p, sk %p", sock, sk); + + err = sock_error(sk); + if (err) + return err; + + if (msg->msg_flags & MSG_OOB) + return -EOPNOTSUPP; + + lock_sock(sk); + + if (sk->sk_state != BT_CONNECTED) { + err = -ENOTCONN; + goto done; + } + + /* Connectionless channel */ + if (sk->sk_type == SOCK_DGRAM) { + skb = l2cap_create_connless_pdu(sk, msg, len); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + } else { + l2cap_do_send(sk, skb); + err = len; + } + goto done; + } + + switch (pi->mode) { + case L2CAP_MODE_BASIC: + /* Check outgoing MTU */ + if (len > pi->omtu) { + err = -EMSGSIZE; + goto done; + } + + /* Create a basic PDU */ + skb = l2cap_create_basic_pdu(sk, msg, len); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + goto done; + } + + l2cap_do_send(sk, skb); + err = len; + break; + + case L2CAP_MODE_ERTM: + case L2CAP_MODE_STREAMING: + /* Entire SDU fits into one PDU */ + if (len <= pi->remote_mps) { + control = L2CAP_SDU_UNSEGMENTED; + skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); + if (IS_ERR(skb)) { + err = PTR_ERR(skb); + goto done; + } + __skb_queue_tail(TX_QUEUE(sk), skb); + + if (sk->sk_send_head == NULL) + sk->sk_send_head = skb; + + } else { + /* Segment SDU into multiples PDUs */ + err = l2cap_sar_segment_sdu(sk, msg, len); + if (err < 0) + goto done; + } + + if (pi->mode == L2CAP_MODE_STREAMING) { + l2cap_streaming_send(sk); + } else { + if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && + pi->conn_state && L2CAP_CONN_WAIT_F) { + err = len; + break; + } + err = l2cap_ertm_send(sk); + } + + if (err >= 0) + err = len; + break; + + default: + BT_DBG("bad state %1.1x", pi->mode); + err = -EBADFD; + } + +done: + release_sock(sk); + return err; +} + +static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) +{ + struct sock *sk = sock->sk; + + lock_sock(sk); + + if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { + struct l2cap_conn_rsp rsp; + struct l2cap_conn *conn = l2cap_pi(sk)->conn; + u8 buf[128]; + + sk->sk_state = BT_CONFIG; + + rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); + rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); + rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, + L2CAP_CONN_RSP, sizeof(rsp), &rsp); + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) { + release_sock(sk); + return 0; + } + + l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(sk, buf), buf); + l2cap_pi(sk)->num_conf_req++; + + release_sock(sk); + return 0; + } + + release_sock(sk); + + return bt_sock_recvmsg(iocb, sock, msg, len, flags); +} + +static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + struct l2cap_options opts; + int len, err = 0; + u32 opt; + + BT_DBG("sk %p", sk); + + lock_sock(sk); + + switch (optname) { + case L2CAP_OPTIONS: + opts.imtu = l2cap_pi(sk)->imtu; + opts.omtu = l2cap_pi(sk)->omtu; + opts.flush_to = l2cap_pi(sk)->flush_to; + opts.mode = l2cap_pi(sk)->mode; + opts.fcs = l2cap_pi(sk)->fcs; + opts.max_tx = l2cap_pi(sk)->max_tx; + opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; + + len = min_t(unsigned int, sizeof(opts), optlen); + if (copy_from_user((char *) &opts, optval, len)) { + err = -EFAULT; + break; + } + + if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) { + err = -EINVAL; + break; + } + + l2cap_pi(sk)->mode = opts.mode; + switch (l2cap_pi(sk)->mode) { + case L2CAP_MODE_BASIC: + l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE; + break; + case L2CAP_MODE_ERTM: + case L2CAP_MODE_STREAMING: + if (enable_ertm) + break; + /* fall through */ + default: + err = -EINVAL; + break; + } + + l2cap_pi(sk)->imtu = opts.imtu; + l2cap_pi(sk)->omtu = opts.omtu; + l2cap_pi(sk)->fcs = opts.fcs; + l2cap_pi(sk)->max_tx = opts.max_tx; + l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; + break; + + case L2CAP_LM: + if (get_user(opt, (u32 __user *) optval)) { + err = -EFAULT; + break; + } + + if (opt & L2CAP_LM_AUTH) + l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; + if (opt & L2CAP_LM_ENCRYPT) + l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; + if (opt & L2CAP_LM_SECURE) + l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; + + l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); + l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) +{ + struct sock *sk = sock->sk; + struct bt_security sec; + int len, err = 0; + u32 opt; + + BT_DBG("sk %p", sk); + + if (level == SOL_L2CAP) + return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); + + if (level != SOL_BLUETOOTH) + return -ENOPROTOOPT; + + lock_sock(sk); + + switch (optname) { + case BT_SECURITY: + if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM + && sk->sk_type != SOCK_RAW) { + err = -EINVAL; + break; + } + + sec.level = BT_SECURITY_LOW; + + len = min_t(unsigned int, sizeof(sec), optlen); + if (copy_from_user((char *) &sec, optval, len)) { + err = -EFAULT; + break; + } + + if (sec.level < BT_SECURITY_LOW || + sec.level > BT_SECURITY_HIGH) { + err = -EINVAL; + break; + } + + l2cap_pi(sk)->sec_level = sec.level; + break; + + case BT_DEFER_SETUP: + if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { + err = -EINVAL; + break; + } + + if (get_user(opt, (u32 __user *) optval)) { + err = -EFAULT; + break; + } + + bt_sk(sk)->defer_setup = opt; + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) +{ + struct sock *sk = sock->sk; + struct l2cap_options opts; + struct l2cap_conninfo cinfo; + int len, err = 0; + u32 opt; + + BT_DBG("sk %p", sk); + + if (get_user(len, optlen)) + return -EFAULT; + + lock_sock(sk); + + switch (optname) { + case L2CAP_OPTIONS: + opts.imtu = l2cap_pi(sk)->imtu; + opts.omtu = l2cap_pi(sk)->omtu; + opts.flush_to = l2cap_pi(sk)->flush_to; + opts.mode = l2cap_pi(sk)->mode; + opts.fcs = l2cap_pi(sk)->fcs; + opts.max_tx = l2cap_pi(sk)->max_tx; + opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; + + len = min_t(unsigned int, len, sizeof(opts)); + if (copy_to_user(optval, (char *) &opts, len)) + err = -EFAULT; + + break; + + case L2CAP_LM: + switch (l2cap_pi(sk)->sec_level) { + case BT_SECURITY_LOW: + opt = L2CAP_LM_AUTH; + break; + case BT_SECURITY_MEDIUM: + opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; + break; + case BT_SECURITY_HIGH: + opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | + L2CAP_LM_SECURE; + break; + default: + opt = 0; + break; + } + + if (l2cap_pi(sk)->role_switch) + opt |= L2CAP_LM_MASTER; + + if (l2cap_pi(sk)->force_reliable) + opt |= L2CAP_LM_RELIABLE; + + if (put_user(opt, (u32 __user *) optval)) + err = -EFAULT; + break; + + case L2CAP_CONNINFO: + if (sk->sk_state != BT_CONNECTED && + !(sk->sk_state == BT_CONNECT2 && + bt_sk(sk)->defer_setup)) { + err = -ENOTCONN; + break; + } + + cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; + memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); + + len = min_t(unsigned int, len, sizeof(cinfo)); + if (copy_to_user(optval, (char *) &cinfo, len)) + err = -EFAULT; + + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) +{ + struct sock *sk = sock->sk; + struct bt_security sec; + int len, err = 0; + + BT_DBG("sk %p", sk); + + if (level == SOL_L2CAP) + return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); + + if (level != SOL_BLUETOOTH) + return -ENOPROTOOPT; + + if (get_user(len, optlen)) + return -EFAULT; + + lock_sock(sk); + + switch (optname) { + case BT_SECURITY: + if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM + && sk->sk_type != SOCK_RAW) { + err = -EINVAL; + break; + } + + sec.level = l2cap_pi(sk)->sec_level; + + len = min_t(unsigned int, len, sizeof(sec)); + if (copy_to_user(optval, (char *) &sec, len)) + err = -EFAULT; + + break; + + case BT_DEFER_SETUP: + if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { + err = -EINVAL; + break; + } + + if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) + err = -EFAULT; + + break; + + default: + err = -ENOPROTOOPT; + break; + } + + release_sock(sk); + return err; +} + +static int l2cap_sock_shutdown(struct socket *sock, int how) +{ + struct sock *sk = sock->sk; + int err = 0; + + BT_DBG("sock %p, sk %p", sock, sk); + + if (!sk) + return 0; + + lock_sock(sk); + if (!sk->sk_shutdown) { + if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) + err = __l2cap_wait_ack(sk); + + sk->sk_shutdown = SHUTDOWN_MASK; + l2cap_sock_clear_timer(sk); + __l2cap_sock_close(sk, 0); + + if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) + err = bt_sock_wait_state(sk, BT_CLOSED, + sk->sk_lingertime); + } + + if (!err && sk->sk_err) + err = -sk->sk_err; + + release_sock(sk); + return err; +} + +static int l2cap_sock_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + int err; + + BT_DBG("sock %p, sk %p", sock, sk); + + if (!sk) + return 0; + + err = l2cap_sock_shutdown(sock, 2); + + sock_orphan(sk); + l2cap_sock_kill(sk); + return err; +} + +static void l2cap_chan_ready(struct sock *sk) +{ + struct sock *parent = bt_sk(sk)->parent; + + BT_DBG("sk %p, parent %p", sk, parent); + + l2cap_pi(sk)->conf_state = 0; + l2cap_sock_clear_timer(sk); + + if (!parent) { + /* Outgoing channel. + * Wake up socket sleeping on connect. + */ + sk->sk_state = BT_CONNECTED; + sk->sk_state_change(sk); + } else { + /* Incoming channel. + * Wake up socket sleeping on accept. + */ + parent->sk_data_ready(parent, 0); + } +} + +/* Copy frame to all raw sockets on that connection */ +static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) +{ + struct l2cap_chan_list *l = &conn->chan_list; + struct sk_buff *nskb; + struct sock *sk; + + BT_DBG("conn %p", conn); + + read_lock(&l->lock); + for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { + if (sk->sk_type != SOCK_RAW) + continue; + + /* Don't send frame to the socket it came from */ + if (skb->sk == sk) + continue; + nskb = skb_clone(skb, GFP_ATOMIC); + if (!nskb) + continue; + + if (sock_queue_rcv_skb(sk, nskb)) + kfree_skb(nskb); + } + read_unlock(&l->lock); +} + +/* ---- L2CAP signalling commands ---- */ +static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, + u8 code, u8 ident, u16 dlen, void *data) +{ + struct sk_buff *skb, **frag; + struct l2cap_cmd_hdr *cmd; + struct l2cap_hdr *lh; + int len, count; + + BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", + conn, code, ident, dlen); + + len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; + count = min_t(unsigned int, conn->mtu, len); + + skb = bt_skb_alloc(count, GFP_ATOMIC); + if (!skb) + return NULL; + + lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); + lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); + lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); + + cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); + cmd->code = code; + cmd->ident = ident; + cmd->len = cpu_to_le16(dlen); + + if (dlen) { + count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; + memcpy(skb_put(skb, count), data, count); + data += count; + } + + len -= skb->len; + + /* Continuation fragments (no L2CAP header) */ + frag = &skb_shinfo(skb)->frag_list; + while (len) { + count = min_t(unsigned int, conn->mtu, len); + + *frag = bt_skb_alloc(count, GFP_ATOMIC); + if (!*frag) + goto fail; + + memcpy(skb_put(*frag, count), data, count); + + len -= count; + data += count; + + frag = &(*frag)->next; + } + + return skb; + +fail: + kfree_skb(skb); + return NULL; +} + +static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) +{ + struct l2cap_conf_opt *opt = *ptr; + int len; + + len = L2CAP_CONF_OPT_SIZE + opt->len; + *ptr += len; + + *type = opt->type; + *olen = opt->len; + + switch (opt->len) { + case 1: + *val = *((u8 *) opt->val); + break; + + case 2: + *val = __le16_to_cpu(*((__le16 *) opt->val)); + break; + + case 4: + *val = __le32_to_cpu(*((__le32 *) opt->val)); + break; + + default: + *val = (unsigned long) opt->val; + break; + } + + BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); + return len; +} + +static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) +{ + struct l2cap_conf_opt *opt = *ptr; + + BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); + + opt->type = type; + opt->len = len; + + switch (len) { + case 1: + *((u8 *) opt->val) = val; + break; + + case 2: + *((__le16 *) opt->val) = cpu_to_le16(val); + break; + + case 4: + *((__le32 *) opt->val) = cpu_to_le32(val); + break; + + default: + memcpy(opt->val, (void *) val, len); + break; + } + + *ptr += L2CAP_CONF_OPT_SIZE + len; +} + +static void l2cap_ack_timeout(unsigned long arg) +{ + struct sock *sk = (void *) arg; + + bh_lock_sock(sk); + l2cap_send_ack(l2cap_pi(sk)); + bh_unlock_sock(sk); +} + +static inline void l2cap_ertm_init(struct sock *sk) +{ + l2cap_pi(sk)->expected_ack_seq = 0; + l2cap_pi(sk)->unacked_frames = 0; + l2cap_pi(sk)->buffer_seq = 0; + l2cap_pi(sk)->num_acked = 0; + l2cap_pi(sk)->frames_sent = 0; + + setup_timer(&l2cap_pi(sk)->retrans_timer, + l2cap_retrans_timeout, (unsigned long) sk); + setup_timer(&l2cap_pi(sk)->monitor_timer, + l2cap_monitor_timeout, (unsigned long) sk); + setup_timer(&l2cap_pi(sk)->ack_timer, + l2cap_ack_timeout, (unsigned long) sk); + + __skb_queue_head_init(SREJ_QUEUE(sk)); + __skb_queue_head_init(BUSY_QUEUE(sk)); + + INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); + + sk->sk_backlog_rcv = l2cap_ertm_data_rcv; +} + +static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) +{ + switch (mode) { + case L2CAP_MODE_STREAMING: + case L2CAP_MODE_ERTM: + if (l2cap_mode_supported(mode, remote_feat_mask)) + return mode; + /* fall through */ + default: + return L2CAP_MODE_BASIC; + } +} + +static int l2cap_build_conf_req(struct sock *sk, void *data) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct l2cap_conf_req *req = data; + struct l2cap_conf_rfc rfc = { .mode = pi->mode }; + void *ptr = req->data; + + BT_DBG("sk %p", sk); + + if (pi->num_conf_req || pi->num_conf_rsp) + goto done; + + switch (pi->mode) { + case L2CAP_MODE_STREAMING: + case L2CAP_MODE_ERTM: + if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) + break; + + /* fall through */ + default: + pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); + break; + } + +done: + switch (pi->mode) { + case L2CAP_MODE_BASIC: + if (pi->imtu != L2CAP_DEFAULT_MTU) + l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); + + rfc.mode = L2CAP_MODE_BASIC; + rfc.txwin_size = 0; + rfc.max_transmit = 0; + rfc.retrans_timeout = 0; + rfc.monitor_timeout = 0; + rfc.max_pdu_size = 0; + + break; + + case L2CAP_MODE_ERTM: + rfc.mode = L2CAP_MODE_ERTM; + rfc.txwin_size = pi->tx_win; + rfc.max_transmit = pi->max_tx; + rfc.retrans_timeout = 0; + rfc.monitor_timeout = 0; + rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); + if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) + rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); + + if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) + break; + + if (pi->fcs == L2CAP_FCS_NONE || + pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { + pi->fcs = L2CAP_FCS_NONE; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); + } + break; + + case L2CAP_MODE_STREAMING: + rfc.mode = L2CAP_MODE_STREAMING; + rfc.txwin_size = 0; + rfc.max_transmit = 0; + rfc.retrans_timeout = 0; + rfc.monitor_timeout = 0; + rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); + if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) + rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); + + if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) + break; + + if (pi->fcs == L2CAP_FCS_NONE || + pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { + pi->fcs = L2CAP_FCS_NONE; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); + } + break; + } + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), + (unsigned long) &rfc); + + /* FIXME: Need actual value of the flush timeout */ + //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) + // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); + + req->dcid = cpu_to_le16(pi->dcid); + req->flags = cpu_to_le16(0); + + return ptr - data; +} + +static int l2cap_parse_conf_req(struct sock *sk, void *data) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct l2cap_conf_rsp *rsp = data; + void *ptr = rsp->data; + void *req = pi->conf_req; + int len = pi->conf_len; + int type, hint, olen; + unsigned long val; + struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; + u16 mtu = L2CAP_DEFAULT_MTU; + u16 result = L2CAP_CONF_SUCCESS; + + BT_DBG("sk %p", sk); + + while (len >= L2CAP_CONF_OPT_SIZE) { + len -= l2cap_get_conf_opt(&req, &type, &olen, &val); + + hint = type & L2CAP_CONF_HINT; + type &= L2CAP_CONF_MASK; + + switch (type) { + case L2CAP_CONF_MTU: + mtu = val; + break; + + case L2CAP_CONF_FLUSH_TO: + pi->flush_to = val; + break; + + case L2CAP_CONF_QOS: + break; + + case L2CAP_CONF_RFC: + if (olen == sizeof(rfc)) + memcpy(&rfc, (void *) val, olen); + break; + + case L2CAP_CONF_FCS: + if (val == L2CAP_FCS_NONE) + pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; + + break; + + default: + if (hint) + break; + + result = L2CAP_CONF_UNKNOWN; + *((u8 *) ptr++) = type; + break; + } + } + + if (pi->num_conf_rsp || pi->num_conf_req > 1) + goto done; + + switch (pi->mode) { + case L2CAP_MODE_STREAMING: + case L2CAP_MODE_ERTM: + if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { + pi->mode = l2cap_select_mode(rfc.mode, + pi->conn->feat_mask); + break; + } + + if (pi->mode != rfc.mode) + return -ECONNREFUSED; + + break; + } + +done: + if (pi->mode != rfc.mode) { + result = L2CAP_CONF_UNACCEPT; + rfc.mode = pi->mode; + + if (pi->num_conf_rsp == 1) + return -ECONNREFUSED; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + } + + + if (result == L2CAP_CONF_SUCCESS) { + /* Configure output options and let the other side know + * which ones we don't like. */ + + if (mtu < L2CAP_DEFAULT_MIN_MTU) + result = L2CAP_CONF_UNACCEPT; + else { + pi->omtu = mtu; + pi->conf_state |= L2CAP_CONF_MTU_DONE; + } + l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); + + switch (rfc.mode) { + case L2CAP_MODE_BASIC: + pi->fcs = L2CAP_FCS_NONE; + pi->conf_state |= L2CAP_CONF_MODE_DONE; + break; + + case L2CAP_MODE_ERTM: + pi->remote_tx_win = rfc.txwin_size; + pi->remote_max_tx = rfc.max_transmit; + if (rfc.max_pdu_size > pi->conn->mtu - 10) + rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); + + pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); + + rfc.retrans_timeout = + le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); + rfc.monitor_timeout = + le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); + + pi->conf_state |= L2CAP_CONF_MODE_DONE; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + + break; + + case L2CAP_MODE_STREAMING: + if (rfc.max_pdu_size > pi->conn->mtu - 10) + rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); + + pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); + + pi->conf_state |= L2CAP_CONF_MODE_DONE; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + + break; + + default: + result = L2CAP_CONF_UNACCEPT; + + memset(&rfc, 0, sizeof(rfc)); + rfc.mode = pi->mode; + } + + if (result == L2CAP_CONF_SUCCESS) + pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; + } + rsp->scid = cpu_to_le16(pi->dcid); + rsp->result = cpu_to_le16(result); + rsp->flags = cpu_to_le16(0x0000); + + return ptr - data; +} + +static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct l2cap_conf_req *req = data; + void *ptr = req->data; + int type, olen; + unsigned long val; + struct l2cap_conf_rfc rfc; + + BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); + + while (len >= L2CAP_CONF_OPT_SIZE) { + len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); + + switch (type) { + case L2CAP_CONF_MTU: + if (val < L2CAP_DEFAULT_MIN_MTU) { + *result = L2CAP_CONF_UNACCEPT; + pi->omtu = L2CAP_DEFAULT_MIN_MTU; + } else + pi->omtu = val; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); + break; + + case L2CAP_CONF_FLUSH_TO: + pi->flush_to = val; + l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, + 2, pi->flush_to); + break; + + case L2CAP_CONF_RFC: + if (olen == sizeof(rfc)) + memcpy(&rfc, (void *)val, olen); + + if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && + rfc.mode != pi->mode) + return -ECONNREFUSED; + + pi->fcs = 0; + + l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, + sizeof(rfc), (unsigned long) &rfc); + break; + } + } + + if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) + return -ECONNREFUSED; + + pi->mode = rfc.mode; + + if (*result == L2CAP_CONF_SUCCESS) { + switch (rfc.mode) { + case L2CAP_MODE_ERTM: + pi->remote_tx_win = rfc.txwin_size; + pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); + pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); + pi->mps = le16_to_cpu(rfc.max_pdu_size); + break; + case L2CAP_MODE_STREAMING: + pi->mps = le16_to_cpu(rfc.max_pdu_size); + } + } + + req->dcid = cpu_to_le16(pi->dcid); + req->flags = cpu_to_le16(0x0000); + + return ptr - data; +} + +static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) +{ + struct l2cap_conf_rsp *rsp = data; + void *ptr = rsp->data; + + BT_DBG("sk %p", sk); + + rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); + rsp->result = cpu_to_le16(result); + rsp->flags = cpu_to_le16(flags); + + return ptr - data; +} + +static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + int type, olen; + unsigned long val; + struct l2cap_conf_rfc rfc; + + BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); + + if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) + return; + + while (len >= L2CAP_CONF_OPT_SIZE) { + len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); + + switch (type) { + case L2CAP_CONF_RFC: + if (olen == sizeof(rfc)) + memcpy(&rfc, (void *)val, olen); + goto done; + } + } + +done: + switch (rfc.mode) { + case L2CAP_MODE_ERTM: + pi->remote_tx_win = rfc.txwin_size; + pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); + pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); + pi->mps = le16_to_cpu(rfc.max_pdu_size); + break; + case L2CAP_MODE_STREAMING: + pi->mps = le16_to_cpu(rfc.max_pdu_size); + } +} + +static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; + + if (rej->reason != 0x0000) + return 0; + + if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && + cmd->ident == conn->info_ident) { + del_timer(&conn->info_timer); + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); + } + + return 0; +} + +static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_chan_list *list = &conn->chan_list; + struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; + struct l2cap_conn_rsp rsp; + struct sock *parent, *uninitialized_var(sk); + int result, status = L2CAP_CS_NO_INFO; + + u16 dcid = 0, scid = __le16_to_cpu(req->scid); + __le16 psm = req->psm; + + BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); + + /* Check if we have socket listening on psm */ + parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); + if (!parent) { + result = L2CAP_CR_BAD_PSM; + goto sendresp; + } + + /* Check if the ACL is secure enough (if not SDP) */ + if (psm != cpu_to_le16(0x0001) && + !hci_conn_check_link_mode(conn->hcon)) { + conn->disc_reason = 0x05; + result = L2CAP_CR_SEC_BLOCK; + goto response; + } + + result = L2CAP_CR_NO_MEM; + + /* Check for backlog size */ + if (sk_acceptq_is_full(parent)) { + BT_DBG("backlog full %d", parent->sk_ack_backlog); + goto response; + } + + sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); + if (!sk) + goto response; + + write_lock_bh(&list->lock); + + /* Check if we already have channel with that dcid */ + if (__l2cap_get_chan_by_dcid(list, scid)) { + write_unlock_bh(&list->lock); + sock_set_flag(sk, SOCK_ZAPPED); + l2cap_sock_kill(sk); + goto response; + } + + hci_conn_hold(conn->hcon); + + l2cap_sock_init(sk, parent); + bacpy(&bt_sk(sk)->src, conn->src); + bacpy(&bt_sk(sk)->dst, conn->dst); + l2cap_pi(sk)->psm = psm; + l2cap_pi(sk)->dcid = scid; + + __l2cap_chan_add(conn, sk, parent); + dcid = l2cap_pi(sk)->scid; + + l2cap_sock_set_timer(sk, sk->sk_sndtimeo); + + l2cap_pi(sk)->ident = cmd->ident; + + if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { + if (l2cap_check_security(sk)) { + if (bt_sk(sk)->defer_setup) { + sk->sk_state = BT_CONNECT2; + result = L2CAP_CR_PEND; + status = L2CAP_CS_AUTHOR_PEND; + parent->sk_data_ready(parent, 0); + } else { + sk->sk_state = BT_CONFIG; + result = L2CAP_CR_SUCCESS; + status = L2CAP_CS_NO_INFO; + } + } else { + sk->sk_state = BT_CONNECT2; + result = L2CAP_CR_PEND; + status = L2CAP_CS_AUTHEN_PEND; + } + } else { + sk->sk_state = BT_CONNECT2; + result = L2CAP_CR_PEND; + status = L2CAP_CS_NO_INFO; + } + + write_unlock_bh(&list->lock); + +response: + bh_unlock_sock(parent); + +sendresp: + rsp.scid = cpu_to_le16(scid); + rsp.dcid = cpu_to_le16(dcid); + rsp.result = cpu_to_le16(result); + rsp.status = cpu_to_le16(status); + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); + + if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { + struct l2cap_info_req info; + info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); + + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; + conn->info_ident = l2cap_get_ident(conn); + + mod_timer(&conn->info_timer, jiffies + + msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); + + l2cap_send_cmd(conn, conn->info_ident, + L2CAP_INFO_REQ, sizeof(info), &info); + } + + if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && + result == L2CAP_CR_SUCCESS) { + u8 buf[128]; + l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(sk, buf), buf); + l2cap_pi(sk)->num_conf_req++; + } + + return 0; +} + +static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; + u16 scid, dcid, result, status; + struct sock *sk; + u8 req[128]; + + scid = __le16_to_cpu(rsp->scid); + dcid = __le16_to_cpu(rsp->dcid); + result = __le16_to_cpu(rsp->result); + status = __le16_to_cpu(rsp->status); + + BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); + + if (scid) { + sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); + if (!sk) + return -EFAULT; + } else { + sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); + if (!sk) + return -EFAULT; + } + + switch (result) { + case L2CAP_CR_SUCCESS: + sk->sk_state = BT_CONFIG; + l2cap_pi(sk)->ident = 0; + l2cap_pi(sk)->dcid = dcid; + l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) + break; + + l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; + + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(sk, req), req); + l2cap_pi(sk)->num_conf_req++; + break; + + case L2CAP_CR_PEND: + l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; + break; + + default: + l2cap_chan_del(sk, ECONNREFUSED); + break; + } + + bh_unlock_sock(sk); + return 0; +} + +static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) +{ + struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; + u16 dcid, flags; + u8 rsp[64]; + struct sock *sk; + int len; + + dcid = __le16_to_cpu(req->dcid); + flags = __le16_to_cpu(req->flags); + + BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); + + sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); + if (!sk) + return -ENOENT; + + if (sk->sk_state != BT_CONFIG) { + struct l2cap_cmd_rej rej; + + rej.reason = cpu_to_le16(0x0002); + l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, + sizeof(rej), &rej); + goto unlock; + } + + /* Reject if config buffer is too small. */ + len = cmd_len - sizeof(*req); + if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, + l2cap_build_conf_rsp(sk, rsp, + L2CAP_CONF_REJECT, flags), rsp); + goto unlock; + } + + /* Store config. */ + memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); + l2cap_pi(sk)->conf_len += len; + + if (flags & 0x0001) { + /* Incomplete config. Send empty response. */ + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, + l2cap_build_conf_rsp(sk, rsp, + L2CAP_CONF_SUCCESS, 0x0001), rsp); + goto unlock; + } + + /* Complete config. */ + len = l2cap_parse_conf_req(sk, rsp); + if (len < 0) { + l2cap_send_disconn_req(conn, sk, ECONNRESET); + goto unlock; + } + + l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); + l2cap_pi(sk)->num_conf_rsp++; + + /* Reset config buffer. */ + l2cap_pi(sk)->conf_len = 0; + + if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) + goto unlock; + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { + if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || + l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) + l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; + + sk->sk_state = BT_CONNECTED; + + l2cap_pi(sk)->next_tx_seq = 0; + l2cap_pi(sk)->expected_tx_seq = 0; + __skb_queue_head_init(TX_QUEUE(sk)); + if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) + l2cap_ertm_init(sk); + + l2cap_chan_ready(sk); + goto unlock; + } + + if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { + u8 buf[64]; + l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, + l2cap_build_conf_req(sk, buf), buf); + l2cap_pi(sk)->num_conf_req++; + } + +unlock: + bh_unlock_sock(sk); + return 0; +} + +static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; + u16 scid, flags, result; + struct sock *sk; + int len = cmd->len - sizeof(*rsp); + + scid = __le16_to_cpu(rsp->scid); + flags = __le16_to_cpu(rsp->flags); + result = __le16_to_cpu(rsp->result); + + BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", + scid, flags, result); + + sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); + if (!sk) + return 0; + + switch (result) { + case L2CAP_CONF_SUCCESS: + l2cap_conf_rfc_get(sk, rsp->data, len); + break; + + case L2CAP_CONF_UNACCEPT: + if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { + char req[64]; + + if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { + l2cap_send_disconn_req(conn, sk, ECONNRESET); + goto done; + } + + /* throw out any old stored conf requests */ + result = L2CAP_CONF_SUCCESS; + len = l2cap_parse_conf_rsp(sk, rsp->data, + len, req, &result); + if (len < 0) { + l2cap_send_disconn_req(conn, sk, ECONNRESET); + goto done; + } + + l2cap_send_cmd(conn, l2cap_get_ident(conn), + L2CAP_CONF_REQ, len, req); + l2cap_pi(sk)->num_conf_req++; + if (result != L2CAP_CONF_SUCCESS) + goto done; + break; + } + + default: + sk->sk_err = ECONNRESET; + l2cap_sock_set_timer(sk, HZ * 5); + l2cap_send_disconn_req(conn, sk, ECONNRESET); + goto done; + } + + if (flags & 0x01) + goto done; + + l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { + if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || + l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) + l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; + + sk->sk_state = BT_CONNECTED; + l2cap_pi(sk)->next_tx_seq = 0; + l2cap_pi(sk)->expected_tx_seq = 0; + __skb_queue_head_init(TX_QUEUE(sk)); + if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) + l2cap_ertm_init(sk); + + l2cap_chan_ready(sk); + } + +done: + bh_unlock_sock(sk); + return 0; +} + +static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; + struct l2cap_disconn_rsp rsp; + u16 dcid, scid; + struct sock *sk; + + scid = __le16_to_cpu(req->scid); + dcid = __le16_to_cpu(req->dcid); + + BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); + + sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); + if (!sk) + return 0; + + rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); + rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); + l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); + + sk->sk_shutdown = SHUTDOWN_MASK; + + l2cap_chan_del(sk, ECONNRESET); + bh_unlock_sock(sk); + + l2cap_sock_kill(sk); + return 0; +} + +static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; + u16 dcid, scid; + struct sock *sk; + + scid = __le16_to_cpu(rsp->scid); + dcid = __le16_to_cpu(rsp->dcid); + + BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); + + sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); + if (!sk) + return 0; + + l2cap_chan_del(sk, 0); + bh_unlock_sock(sk); + + l2cap_sock_kill(sk); + return 0; +} + +static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_info_req *req = (struct l2cap_info_req *) data; + u16 type; + + type = __le16_to_cpu(req->type); + + BT_DBG("type 0x%4.4x", type); + + if (type == L2CAP_IT_FEAT_MASK) { + u8 buf[8]; + u32 feat_mask = l2cap_feat_mask; + struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; + rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); + rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); + if (enable_ertm) + feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING + | L2CAP_FEAT_FCS; + put_unaligned_le32(feat_mask, rsp->data); + l2cap_send_cmd(conn, cmd->ident, + L2CAP_INFO_RSP, sizeof(buf), buf); + } else if (type == L2CAP_IT_FIXED_CHAN) { + u8 buf[12]; + struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; + rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); + rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); + memcpy(buf + 4, l2cap_fixed_chan, 8); + l2cap_send_cmd(conn, cmd->ident, + L2CAP_INFO_RSP, sizeof(buf), buf); + } else { + struct l2cap_info_rsp rsp; + rsp.type = cpu_to_le16(type); + rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); + l2cap_send_cmd(conn, cmd->ident, + L2CAP_INFO_RSP, sizeof(rsp), &rsp); + } + + return 0; +} + +static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) +{ + struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; + u16 type, result; + + type = __le16_to_cpu(rsp->type); + result = __le16_to_cpu(rsp->result); + + BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); + + del_timer(&conn->info_timer); + + if (type == L2CAP_IT_FEAT_MASK) { + conn->feat_mask = get_unaligned_le32(rsp->data); + + if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { + struct l2cap_info_req req; + req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); + + conn->info_ident = l2cap_get_ident(conn); + + l2cap_send_cmd(conn, conn->info_ident, + L2CAP_INFO_REQ, sizeof(req), &req); + } else { + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); + } + } else if (type == L2CAP_IT_FIXED_CHAN) { + conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; + conn->info_ident = 0; + + l2cap_conn_start(conn); + } + + return 0; +} + +static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) +{ + u8 *data = skb->data; + int len = skb->len; + struct l2cap_cmd_hdr cmd; + int err = 0; + + l2cap_raw_recv(conn, skb); + + while (len >= L2CAP_CMD_HDR_SIZE) { + u16 cmd_len; + memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); + data += L2CAP_CMD_HDR_SIZE; + len -= L2CAP_CMD_HDR_SIZE; + + cmd_len = le16_to_cpu(cmd.len); + + BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); + + if (cmd_len > len || !cmd.ident) { + BT_DBG("corrupted command"); + break; + } + + switch (cmd.code) { + case L2CAP_COMMAND_REJ: + l2cap_command_rej(conn, &cmd, data); + break; + + case L2CAP_CONN_REQ: + err = l2cap_connect_req(conn, &cmd, data); + break; + + case L2CAP_CONN_RSP: + err = l2cap_connect_rsp(conn, &cmd, data); + break; + + case L2CAP_CONF_REQ: + err = l2cap_config_req(conn, &cmd, cmd_len, data); + break; + + case L2CAP_CONF_RSP: + err = l2cap_config_rsp(conn, &cmd, data); + break; + + case L2CAP_DISCONN_REQ: + err = l2cap_disconnect_req(conn, &cmd, data); + break; + + case L2CAP_DISCONN_RSP: + err = l2cap_disconnect_rsp(conn, &cmd, data); + break; + + case L2CAP_ECHO_REQ: + l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); + break; + + case L2CAP_ECHO_RSP: + break; + + case L2CAP_INFO_REQ: + err = l2cap_information_req(conn, &cmd, data); + break; + + case L2CAP_INFO_RSP: + err = l2cap_information_rsp(conn, &cmd, data); + break; + + default: + BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); + err = -EINVAL; + break; + } + + if (err) { + struct l2cap_cmd_rej rej; + BT_DBG("error %d", err); + + /* FIXME: Map err to a valid reason */ + rej.reason = cpu_to_le16(0); + l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); + } + + data += cmd_len; + len -= cmd_len; + } + + kfree_skb(skb); +} + +static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) +{ + u16 our_fcs, rcv_fcs; + int hdr_size = L2CAP_HDR_SIZE + 2; + + if (pi->fcs == L2CAP_FCS_CRC16) { + skb_trim(skb, skb->len - 2); + rcv_fcs = get_unaligned_le16(skb->data + skb->len); + our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); + + if (our_fcs != rcv_fcs) + return -EBADMSG; + } + return 0; +} + +static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u16 control = 0; + + pi->frames_sent = 0; + + control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + + if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { + control |= L2CAP_SUPER_RCV_NOT_READY; + l2cap_send_sframe(pi, control); + pi->conn_state |= L2CAP_CONN_RNR_SENT; + } + + if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) + l2cap_retransmit_frames(sk); + + l2cap_ertm_send(sk); + + if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && + pi->frames_sent == 0) { + control |= L2CAP_SUPER_RCV_READY; + l2cap_send_sframe(pi, control); + } +} + +static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) +{ + struct sk_buff *next_skb; + struct l2cap_pinfo *pi = l2cap_pi(sk); + int tx_seq_offset, next_tx_seq_offset; + + bt_cb(skb)->tx_seq = tx_seq; + bt_cb(skb)->sar = sar; + + next_skb = skb_peek(SREJ_QUEUE(sk)); + if (!next_skb) { + __skb_queue_tail(SREJ_QUEUE(sk), skb); + return 0; + } + + tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; + if (tx_seq_offset < 0) + tx_seq_offset += 64; + + do { + if (bt_cb(next_skb)->tx_seq == tx_seq) + return -EINVAL; + + next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - + pi->buffer_seq) % 64; + if (next_tx_seq_offset < 0) + next_tx_seq_offset += 64; + + if (next_tx_seq_offset > tx_seq_offset) { + __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); + return 0; + } + + if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) + break; + + } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); + + __skb_queue_tail(SREJ_QUEUE(sk), skb); + + return 0; +} + +static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *_skb; + int err; + + switch (control & L2CAP_CTRL_SAR) { + case L2CAP_SDU_UNSEGMENTED: + if (pi->conn_state & L2CAP_CONN_SAR_SDU) + goto drop; + + err = sock_queue_rcv_skb(sk, skb); + if (!err) + return err; + + break; + + case L2CAP_SDU_START: + if (pi->conn_state & L2CAP_CONN_SAR_SDU) + goto drop; + + pi->sdu_len = get_unaligned_le16(skb->data); + + if (pi->sdu_len > pi->imtu) + goto disconnect; + + pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); + if (!pi->sdu) + return -ENOMEM; + + /* pull sdu_len bytes only after alloc, because of Local Busy + * condition we have to be sure that this will be executed + * only once, i.e., when alloc does not fail */ + skb_pull(skb, 2); + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + + pi->conn_state |= L2CAP_CONN_SAR_SDU; + pi->partial_sdu_len = skb->len; + break; + + case L2CAP_SDU_CONTINUE: + if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) + goto disconnect; + + if (!pi->sdu) + goto disconnect; + + pi->partial_sdu_len += skb->len; + if (pi->partial_sdu_len > pi->sdu_len) + goto drop; + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + + break; + + case L2CAP_SDU_END: + if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) + goto disconnect; + + if (!pi->sdu) + goto disconnect; + + if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { + pi->partial_sdu_len += skb->len; + + if (pi->partial_sdu_len > pi->imtu) + goto drop; + + if (pi->partial_sdu_len != pi->sdu_len) + goto drop; + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + } + + _skb = skb_clone(pi->sdu, GFP_ATOMIC); + if (!_skb) { + pi->conn_state |= L2CAP_CONN_SAR_RETRY; + return -ENOMEM; + } + + err = sock_queue_rcv_skb(sk, _skb); + if (err < 0) { + kfree_skb(_skb); + pi->conn_state |= L2CAP_CONN_SAR_RETRY; + return err; + } + + pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; + pi->conn_state &= ~L2CAP_CONN_SAR_SDU; + + kfree_skb(pi->sdu); + break; + } + + kfree_skb(skb); + return 0; + +drop: + kfree_skb(pi->sdu); + pi->sdu = NULL; + +disconnect: + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + kfree_skb(skb); + return 0; +} + +static int l2cap_try_push_rx_skb(struct sock *sk) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *skb; + u16 control; + int err; + + while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { + control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; + err = l2cap_ertm_reassembly_sdu(sk, skb, control); + if (err < 0) { + skb_queue_head(BUSY_QUEUE(sk), skb); + return -EBUSY; + } + + pi->buffer_seq = (pi->buffer_seq + 1) % 64; + } + + if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) + goto done; + + control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; + l2cap_send_sframe(pi, control); + l2cap_pi(sk)->retry_count = 1; + + del_timer(&pi->retrans_timer); + __mod_monitor_timer(); + + l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; + +done: + pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; + pi->conn_state &= ~L2CAP_CONN_RNR_SENT; + + BT_DBG("sk %p, Exit local busy", sk); + + return 0; +} + +static void l2cap_busy_work(struct work_struct *work) +{ + DECLARE_WAITQUEUE(wait, current); + struct l2cap_pinfo *pi = + container_of(work, struct l2cap_pinfo, busy_work); + struct sock *sk = (struct sock *)pi; + int n_tries = 0, timeo = HZ/5, err; + struct sk_buff *skb; + + lock_sock(sk); + + add_wait_queue(sk_sleep(sk), &wait); + while ((skb = skb_peek(BUSY_QUEUE(sk)))) { + set_current_state(TASK_INTERRUPTIBLE); + + if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { + err = -EBUSY; + l2cap_send_disconn_req(pi->conn, sk, EBUSY); + break; + } + + if (!timeo) + timeo = HZ/5; + + if (signal_pending(current)) { + err = sock_intr_errno(timeo); + break; + } + + release_sock(sk); + timeo = schedule_timeout(timeo); + lock_sock(sk); + + err = sock_error(sk); + if (err) + break; + + if (l2cap_try_push_rx_skb(sk) == 0) + break; + } + + set_current_state(TASK_RUNNING); + remove_wait_queue(sk_sleep(sk), &wait); + + release_sock(sk); +} + +static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + int sctrl, err; + + if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { + bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; + __skb_queue_tail(BUSY_QUEUE(sk), skb); + return l2cap_try_push_rx_skb(sk); + + + } + + err = l2cap_ertm_reassembly_sdu(sk, skb, control); + if (err >= 0) { + pi->buffer_seq = (pi->buffer_seq + 1) % 64; + return err; + } + + /* Busy Condition */ + BT_DBG("sk %p, Enter local busy", sk); + + pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; + bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; + __skb_queue_tail(BUSY_QUEUE(sk), skb); + + sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; + sctrl |= L2CAP_SUPER_RCV_NOT_READY; + l2cap_send_sframe(pi, sctrl); + + pi->conn_state |= L2CAP_CONN_RNR_SENT; + + del_timer(&pi->ack_timer); + + queue_work(_busy_wq, &pi->busy_work); + + return err; +} + +static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct sk_buff *_skb; + int err = -EINVAL; + + /* + * TODO: We have to notify the userland if some data is lost with the + * Streaming Mode. + */ + + switch (control & L2CAP_CTRL_SAR) { + case L2CAP_SDU_UNSEGMENTED: + if (pi->conn_state & L2CAP_CONN_SAR_SDU) { + kfree_skb(pi->sdu); + break; + } + + err = sock_queue_rcv_skb(sk, skb); + if (!err) + return 0; + + break; + + case L2CAP_SDU_START: + if (pi->conn_state & L2CAP_CONN_SAR_SDU) { + kfree_skb(pi->sdu); + break; + } + + pi->sdu_len = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + + if (pi->sdu_len > pi->imtu) { + err = -EMSGSIZE; + break; + } + + pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); + if (!pi->sdu) { + err = -ENOMEM; + break; + } + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + + pi->conn_state |= L2CAP_CONN_SAR_SDU; + pi->partial_sdu_len = skb->len; + err = 0; + break; + + case L2CAP_SDU_CONTINUE: + if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) + break; + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + + pi->partial_sdu_len += skb->len; + if (pi->partial_sdu_len > pi->sdu_len) + kfree_skb(pi->sdu); + else + err = 0; + + break; + + case L2CAP_SDU_END: + if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) + break; + + memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); + + pi->conn_state &= ~L2CAP_CONN_SAR_SDU; + pi->partial_sdu_len += skb->len; + + if (pi->partial_sdu_len > pi->imtu) + goto drop; + + if (pi->partial_sdu_len == pi->sdu_len) { + _skb = skb_clone(pi->sdu, GFP_ATOMIC); + err = sock_queue_rcv_skb(sk, _skb); + if (err < 0) + kfree_skb(_skb); + } + err = 0; + +drop: + kfree_skb(pi->sdu); + break; + } + + kfree_skb(skb); + return err; +} + +static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) +{ + struct sk_buff *skb; + u16 control; + + while ((skb = skb_peek(SREJ_QUEUE(sk)))) { + if (bt_cb(skb)->tx_seq != tx_seq) + break; + + skb = skb_dequeue(SREJ_QUEUE(sk)); + control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; + l2cap_ertm_reassembly_sdu(sk, skb, control); + l2cap_pi(sk)->buffer_seq_srej = + (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; + tx_seq = (tx_seq + 1) % 64; + } +} + +static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct srej_list *l, *tmp; + u16 control; + + list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { + if (l->tx_seq == tx_seq) { + list_del(&l->list); + kfree(l); + return; + } + control = L2CAP_SUPER_SELECT_REJECT; + control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; + l2cap_send_sframe(pi, control); + list_del(&l->list); + list_add_tail(&l->list, SREJ_LIST(sk)); + } +} + +static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + struct srej_list *new; + u16 control; + + while (tx_seq != pi->expected_tx_seq) { + control = L2CAP_SUPER_SELECT_REJECT; + control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; + l2cap_send_sframe(pi, control); + + new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); + new->tx_seq = pi->expected_tx_seq; + pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; + list_add_tail(&new->list, SREJ_LIST(sk)); + } + pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; +} + +static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u8 tx_seq = __get_txseq(rx_control); + u8 req_seq = __get_reqseq(rx_control); + u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; + int tx_seq_offset, expected_tx_seq_offset; + int num_to_ack = (pi->tx_win/6) + 1; + int err = 0; + + BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, + rx_control); + + if (L2CAP_CTRL_FINAL & rx_control && + l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { + del_timer(&pi->monitor_timer); + if (pi->unacked_frames > 0) + __mod_retrans_timer(); + pi->conn_state &= ~L2CAP_CONN_WAIT_F; + } + + pi->expected_ack_seq = req_seq; + l2cap_drop_acked_frames(sk); + + if (tx_seq == pi->expected_tx_seq) + goto expected; + + tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; + if (tx_seq_offset < 0) + tx_seq_offset += 64; + + /* invalid tx_seq */ + if (tx_seq_offset >= pi->tx_win) { + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + goto drop; + } + + if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) + goto drop; + + if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { + struct srej_list *first; + + first = list_first_entry(SREJ_LIST(sk), + struct srej_list, list); + if (tx_seq == first->tx_seq) { + l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); + l2cap_check_srej_gap(sk, tx_seq); + + list_del(&first->list); + kfree(first); + + if (list_empty(SREJ_LIST(sk))) { + pi->buffer_seq = pi->buffer_seq_srej; + pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; + l2cap_send_ack(pi); + BT_DBG("sk %p, Exit SREJ_SENT", sk); + } + } else { + struct srej_list *l; + + /* duplicated tx_seq */ + if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) + goto drop; + + list_for_each_entry(l, SREJ_LIST(sk), list) { + if (l->tx_seq == tx_seq) { + l2cap_resend_srejframe(sk, tx_seq); + return 0; + } + } + l2cap_send_srejframe(sk, tx_seq); + } + } else { + expected_tx_seq_offset = + (pi->expected_tx_seq - pi->buffer_seq) % 64; + if (expected_tx_seq_offset < 0) + expected_tx_seq_offset += 64; + + /* duplicated tx_seq */ + if (tx_seq_offset < expected_tx_seq_offset) + goto drop; + + pi->conn_state |= L2CAP_CONN_SREJ_SENT; + + BT_DBG("sk %p, Enter SREJ", sk); + + INIT_LIST_HEAD(SREJ_LIST(sk)); + pi->buffer_seq_srej = pi->buffer_seq; + + __skb_queue_head_init(SREJ_QUEUE(sk)); + __skb_queue_head_init(BUSY_QUEUE(sk)); + l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); + + pi->conn_state |= L2CAP_CONN_SEND_PBIT; + + l2cap_send_srejframe(sk, tx_seq); + + del_timer(&pi->ack_timer); + } + return 0; + +expected: + pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; + + if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { + bt_cb(skb)->tx_seq = tx_seq; + bt_cb(skb)->sar = sar; + __skb_queue_tail(SREJ_QUEUE(sk), skb); + return 0; + } + + err = l2cap_push_rx_skb(sk, skb, rx_control); + if (err < 0) + return 0; + + if (rx_control & L2CAP_CTRL_FINAL) { + if (pi->conn_state & L2CAP_CONN_REJ_ACT) + pi->conn_state &= ~L2CAP_CONN_REJ_ACT; + else + l2cap_retransmit_frames(sk); + } + + __mod_ack_timer(); + + pi->num_acked = (pi->num_acked + 1) % num_to_ack; + if (pi->num_acked == num_to_ack - 1) + l2cap_send_ack(pi); + + return 0; + +drop: + kfree_skb(skb); + return 0; +} + +static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + + BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), + rx_control); + + pi->expected_ack_seq = __get_reqseq(rx_control); + l2cap_drop_acked_frames(sk); + + if (rx_control & L2CAP_CTRL_POLL) { + pi->conn_state |= L2CAP_CONN_SEND_FBIT; + if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { + if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && + (pi->unacked_frames > 0)) + __mod_retrans_timer(); + + pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + l2cap_send_srejtail(sk); + } else { + l2cap_send_i_or_rr_or_rnr(sk); + } + + } else if (rx_control & L2CAP_CTRL_FINAL) { + pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + + if (pi->conn_state & L2CAP_CONN_REJ_ACT) + pi->conn_state &= ~L2CAP_CONN_REJ_ACT; + else + l2cap_retransmit_frames(sk); + + } else { + if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && + (pi->unacked_frames > 0)) + __mod_retrans_timer(); + + pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { + l2cap_send_ack(pi); + } else { + l2cap_ertm_send(sk); + } + } +} + +static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u8 tx_seq = __get_reqseq(rx_control); + + BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); + + pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + + pi->expected_ack_seq = tx_seq; + l2cap_drop_acked_frames(sk); + + if (rx_control & L2CAP_CTRL_FINAL) { + if (pi->conn_state & L2CAP_CONN_REJ_ACT) + pi->conn_state &= ~L2CAP_CONN_REJ_ACT; + else + l2cap_retransmit_frames(sk); + } else { + l2cap_retransmit_frames(sk); + + if (pi->conn_state & L2CAP_CONN_WAIT_F) + pi->conn_state |= L2CAP_CONN_REJ_ACT; + } +} +static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u8 tx_seq = __get_reqseq(rx_control); + + BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); + + pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; + + if (rx_control & L2CAP_CTRL_POLL) { + pi->expected_ack_seq = tx_seq; + l2cap_drop_acked_frames(sk); + + pi->conn_state |= L2CAP_CONN_SEND_FBIT; + l2cap_retransmit_one_frame(sk, tx_seq); + + l2cap_ertm_send(sk); + + if (pi->conn_state & L2CAP_CONN_WAIT_F) { + pi->srej_save_reqseq = tx_seq; + pi->conn_state |= L2CAP_CONN_SREJ_ACT; + } + } else if (rx_control & L2CAP_CTRL_FINAL) { + if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && + pi->srej_save_reqseq == tx_seq) + pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; + else + l2cap_retransmit_one_frame(sk, tx_seq); + } else { + l2cap_retransmit_one_frame(sk, tx_seq); + if (pi->conn_state & L2CAP_CONN_WAIT_F) { + pi->srej_save_reqseq = tx_seq; + pi->conn_state |= L2CAP_CONN_SREJ_ACT; + } + } +} + +static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u8 tx_seq = __get_reqseq(rx_control); + + BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); + + pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; + pi->expected_ack_seq = tx_seq; + l2cap_drop_acked_frames(sk); + + if (rx_control & L2CAP_CTRL_POLL) + pi->conn_state |= L2CAP_CONN_SEND_FBIT; + + if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { + del_timer(&pi->retrans_timer); + if (rx_control & L2CAP_CTRL_POLL) + l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); + return; + } + + if (rx_control & L2CAP_CTRL_POLL) + l2cap_send_srejtail(sk); + else + l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); +} + +static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) +{ + BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); + + if (L2CAP_CTRL_FINAL & rx_control && + l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { + del_timer(&l2cap_pi(sk)->monitor_timer); + if (l2cap_pi(sk)->unacked_frames > 0) + __mod_retrans_timer(); + l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; + } + + switch (rx_control & L2CAP_CTRL_SUPERVISE) { + case L2CAP_SUPER_RCV_READY: + l2cap_data_channel_rrframe(sk, rx_control); + break; + + case L2CAP_SUPER_REJECT: + l2cap_data_channel_rejframe(sk, rx_control); + break; + + case L2CAP_SUPER_SELECT_REJECT: + l2cap_data_channel_srejframe(sk, rx_control); + break; + + case L2CAP_SUPER_RCV_NOT_READY: + l2cap_data_channel_rnrframe(sk, rx_control); + break; + } + + kfree_skb(skb); + return 0; +} + +static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + u16 control; + u8 req_seq; + int len, next_tx_seq_offset, req_seq_offset; + + control = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + len = skb->len; + + /* + * We can just drop the corrupted I-frame here. + * Receiver will miss it and start proper recovery + * procedures and ask retransmission. + */ + if (l2cap_check_fcs(pi, skb)) + goto drop; + + if (__is_sar_start(control) && __is_iframe(control)) + len -= 2; + + if (pi->fcs == L2CAP_FCS_CRC16) + len -= 2; + + if (len > pi->mps) { + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + goto drop; + } + + req_seq = __get_reqseq(control); + req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; + if (req_seq_offset < 0) + req_seq_offset += 64; + + next_tx_seq_offset = + (pi->next_tx_seq - pi->expected_ack_seq) % 64; + if (next_tx_seq_offset < 0) + next_tx_seq_offset += 64; + + /* check for invalid req-seq */ + if (req_seq_offset > next_tx_seq_offset) { + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + goto drop; + } + + if (__is_iframe(control)) { + if (len < 0) { + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + goto drop; + } + + l2cap_data_channel_iframe(sk, control, skb); + } else { + if (len != 0) { + BT_ERR("%d", len); + l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); + goto drop; + } + + l2cap_data_channel_sframe(sk, control, skb); + } + + return 0; + +drop: + kfree_skb(skb); + return 0; +} + +static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) +{ + struct sock *sk; + struct l2cap_pinfo *pi; + u16 control; + u8 tx_seq; + int len; + + sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); + if (!sk) { + BT_DBG("unknown cid 0x%4.4x", cid); + goto drop; + } + + pi = l2cap_pi(sk); + + BT_DBG("sk %p, len %d", sk, skb->len); + + if (sk->sk_state != BT_CONNECTED) + goto drop; + + switch (pi->mode) { + case L2CAP_MODE_BASIC: + /* If socket recv buffers overflows we drop data here + * which is *bad* because L2CAP has to be reliable. + * But we don't have any other choice. L2CAP doesn't + * provide flow control mechanism. */ + + if (pi->imtu < skb->len) + goto drop; + + if (!sock_queue_rcv_skb(sk, skb)) + goto done; + break; + + case L2CAP_MODE_ERTM: + if (!sock_owned_by_user(sk)) { + l2cap_ertm_data_rcv(sk, skb); + } else { + if (sk_add_backlog(sk, skb)) + goto drop; + } + + goto done; + + case L2CAP_MODE_STREAMING: + control = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + len = skb->len; + + if (l2cap_check_fcs(pi, skb)) + goto drop; + + if (__is_sar_start(control)) + len -= 2; + + if (pi->fcs == L2CAP_FCS_CRC16) + len -= 2; + + if (len > pi->mps || len < 0 || __is_sframe(control)) + goto drop; + + tx_seq = __get_txseq(control); + + if (pi->expected_tx_seq == tx_seq) + pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; + else + pi->expected_tx_seq = (tx_seq + 1) % 64; + + l2cap_streaming_reassembly_sdu(sk, skb, control); + + goto done; + + default: + BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); + break; + } + +drop: + kfree_skb(skb); + +done: + if (sk) + bh_unlock_sock(sk); + + return 0; +} + +static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) +{ + struct sock *sk; + + sk = l2cap_get_sock_by_psm(0, psm, conn->src); + if (!sk) + goto drop; + + BT_DBG("sk %p, len %d", sk, skb->len); + + if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) + goto drop; + + if (l2cap_pi(sk)->imtu < skb->len) + goto drop; + + if (!sock_queue_rcv_skb(sk, skb)) + goto done; + +drop: + kfree_skb(skb); + +done: + if (sk) + bh_unlock_sock(sk); + return 0; +} + +static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) +{ + struct l2cap_hdr *lh = (void *) skb->data; + u16 cid, len; + __le16 psm; + + skb_pull(skb, L2CAP_HDR_SIZE); + cid = __le16_to_cpu(lh->cid); + len = __le16_to_cpu(lh->len); + + if (len != skb->len) { + kfree_skb(skb); + return; + } + + BT_DBG("len %d, cid 0x%4.4x", len, cid); + + switch (cid) { + case L2CAP_CID_SIGNALING: + l2cap_sig_channel(conn, skb); + break; + + case L2CAP_CID_CONN_LESS: + psm = get_unaligned_le16(skb->data); + skb_pull(skb, 2); + l2cap_conless_channel(conn, psm, skb); + break; + + default: + l2cap_data_channel(conn, cid, skb); + break; + } +} + +/* ---- L2CAP interface with lower layer (HCI) ---- */ + +static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) +{ + int exact = 0, lm1 = 0, lm2 = 0; + register struct sock *sk; + struct hlist_node *node; + + if (type != ACL_LINK) + return -EINVAL; + + BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); + + /* Find listening sockets and check their link_mode */ + read_lock(&l2cap_sk_list.lock); + sk_for_each(sk, node, &l2cap_sk_list.head) { + if (sk->sk_state != BT_LISTEN) + continue; + + if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { + lm1 |= HCI_LM_ACCEPT; + if (l2cap_pi(sk)->role_switch) + lm1 |= HCI_LM_MASTER; + exact++; + } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { + lm2 |= HCI_LM_ACCEPT; + if (l2cap_pi(sk)->role_switch) + lm2 |= HCI_LM_MASTER; + } + } + read_unlock(&l2cap_sk_list.lock); + + return exact ? lm1 : lm2; +} + +static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) +{ + struct l2cap_conn *conn; + + BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); + + if (hcon->type != ACL_LINK) + return -EINVAL; + + if (!status) { + conn = l2cap_conn_add(hcon, status); + if (conn) + l2cap_conn_ready(conn); + } else + l2cap_conn_del(hcon, bt_err(status)); + + return 0; +} + +static int l2cap_disconn_ind(struct hci_conn *hcon) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + + BT_DBG("hcon %p", hcon); + + if (hcon->type != ACL_LINK || !conn) + return 0x13; + + return conn->disc_reason; +} + +static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) +{ + BT_DBG("hcon %p reason %d", hcon, reason); + + if (hcon->type != ACL_LINK) + return -EINVAL; + + l2cap_conn_del(hcon, bt_err(reason)); + + return 0; +} + +static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) +{ + if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) + return; + + if (encrypt == 0x00) { + if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ * 5); + } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) + __l2cap_sock_close(sk, ECONNREFUSED); + } else { + if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) + l2cap_sock_clear_timer(sk); + } +} + +static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) +{ + struct l2cap_chan_list *l; + struct l2cap_conn *conn = hcon->l2cap_data; + struct sock *sk; + + if (!conn) + return 0; + + l = &conn->chan_list; + + BT_DBG("conn %p", conn); + + read_lock(&l->lock); + + for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { + bh_lock_sock(sk); + + if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { + bh_unlock_sock(sk); + continue; + } + + if (!status && (sk->sk_state == BT_CONNECTED || + sk->sk_state == BT_CONFIG)) { + l2cap_check_encryption(sk, encrypt); + bh_unlock_sock(sk); + continue; + } + + if (sk->sk_state == BT_CONNECT) { + if (!status) { + struct l2cap_conn_req req; + req.scid = cpu_to_le16(l2cap_pi(sk)->scid); + req.psm = l2cap_pi(sk)->psm; + + l2cap_pi(sk)->ident = l2cap_get_ident(conn); + l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; + + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_REQ, sizeof(req), &req); + } else { + l2cap_sock_clear_timer(sk); + l2cap_sock_set_timer(sk, HZ / 10); + } + } else if (sk->sk_state == BT_CONNECT2) { + struct l2cap_conn_rsp rsp; + __u16 result; + + if (!status) { + sk->sk_state = BT_CONFIG; + result = L2CAP_CR_SUCCESS; + } else { + sk->sk_state = BT_DISCONN; + l2cap_sock_set_timer(sk, HZ / 10); + result = L2CAP_CR_SEC_BLOCK; + } + + rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); + rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); + rsp.result = cpu_to_le16(result); + rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); + l2cap_send_cmd(conn, l2cap_pi(sk)->ident, + L2CAP_CONN_RSP, sizeof(rsp), &rsp); + } + + bh_unlock_sock(sk); + } + + read_unlock(&l->lock); + + return 0; +} + +static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) +{ + struct l2cap_conn *conn = hcon->l2cap_data; + + if (!conn && !(conn = l2cap_conn_add(hcon, 0))) + goto drop; + + BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); + + if (flags & ACL_START) { + struct l2cap_hdr *hdr; + int len; + + if (conn->rx_len) { + BT_ERR("Unexpected start frame (len %d)", skb->len); + kfree_skb(conn->rx_skb); + conn->rx_skb = NULL; + conn->rx_len = 0; + l2cap_conn_unreliable(conn, ECOMM); + } + + if (skb->len < 2) { + BT_ERR("Frame is too short (len %d)", skb->len); + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + hdr = (struct l2cap_hdr *) skb->data; + len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; + + if (len == skb->len) { + /* Complete frame received */ + l2cap_recv_frame(conn, skb); + return 0; + } + + BT_DBG("Start: total len %d, frag len %d", len, skb->len); + + if (skb->len > len) { + BT_ERR("Frame is too long (len %d, expected len %d)", + skb->len, len); + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + /* Allocate skb for the complete frame (with header) */ + conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); + if (!conn->rx_skb) + goto drop; + + skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), + skb->len); + conn->rx_len = len - skb->len; + } else { + BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); + + if (!conn->rx_len) { + BT_ERR("Unexpected continuation frame (len %d)", skb->len); + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + if (skb->len > conn->rx_len) { + BT_ERR("Fragment is too long (len %d, expected %d)", + skb->len, conn->rx_len); + kfree_skb(conn->rx_skb); + conn->rx_skb = NULL; + conn->rx_len = 0; + l2cap_conn_unreliable(conn, ECOMM); + goto drop; + } + + skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), + skb->len); + conn->rx_len -= skb->len; + + if (!conn->rx_len) { + /* Complete frame received */ + l2cap_recv_frame(conn, conn->rx_skb); + conn->rx_skb = NULL; + } + } + +drop: + kfree_skb(skb); + return 0; +} + +static int l2cap_debugfs_show(struct seq_file *f, void *p) +{ + struct sock *sk; + struct hlist_node *node; + + read_lock_bh(&l2cap_sk_list.lock); + + sk_for_each(sk, node, &l2cap_sk_list.head) { + struct l2cap_pinfo *pi = l2cap_pi(sk); + + seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", + batostr(&bt_sk(sk)->src), + batostr(&bt_sk(sk)->dst), + sk->sk_state, __le16_to_cpu(pi->psm), + pi->scid, pi->dcid, + pi->imtu, pi->omtu, pi->sec_level); + } + + read_unlock_bh(&l2cap_sk_list.lock); + + return 0; +} + +static int l2cap_debugfs_open(struct inode *inode, struct file *file) +{ + return single_open(file, l2cap_debugfs_show, inode->i_private); +} + +static const struct file_operations l2cap_debugfs_fops = { + .open = l2cap_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct dentry *l2cap_debugfs; + +static const struct proto_ops l2cap_sock_ops = { + .family = PF_BLUETOOTH, + .owner = THIS_MODULE, + .release = l2cap_sock_release, + .bind = l2cap_sock_bind, + .connect = l2cap_sock_connect, + .listen = l2cap_sock_listen, + .accept = l2cap_sock_accept, + .getname = l2cap_sock_getname, + .sendmsg = l2cap_sock_sendmsg, + .recvmsg = l2cap_sock_recvmsg, + .poll = bt_sock_poll, + .ioctl = bt_sock_ioctl, + .mmap = sock_no_mmap, + .socketpair = sock_no_socketpair, + .shutdown = l2cap_sock_shutdown, + .setsockopt = l2cap_sock_setsockopt, + .getsockopt = l2cap_sock_getsockopt +}; + +static const struct net_proto_family l2cap_sock_family_ops = { + .family = PF_BLUETOOTH, + .owner = THIS_MODULE, + .create = l2cap_sock_create, +}; + +static struct hci_proto l2cap_hci_proto = { + .name = "L2CAP", + .id = HCI_PROTO_L2CAP, + .connect_ind = l2cap_connect_ind, + .connect_cfm = l2cap_connect_cfm, + .disconn_ind = l2cap_disconn_ind, + .disconn_cfm = l2cap_disconn_cfm, + .security_cfm = l2cap_security_cfm, + .recv_acldata = l2cap_recv_acldata +}; + +static int __init l2cap_init(void) +{ + int err; + + err = proto_register(&l2cap_proto, 0); + if (err < 0) + return err; + + _busy_wq = create_singlethread_workqueue("l2cap"); + if (!_busy_wq) + goto error; + + err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); + if (err < 0) { + BT_ERR("L2CAP socket registration failed"); + goto error; + } + + err = hci_register_proto(&l2cap_hci_proto); + if (err < 0) { + BT_ERR("L2CAP protocol registration failed"); + bt_sock_unregister(BTPROTO_L2CAP); + goto error; + } + + if (bt_debugfs) { + l2cap_debugfs = debugfs_create_file("l2cap", 0444, + bt_debugfs, NULL, &l2cap_debugfs_fops); + if (!l2cap_debugfs) + BT_ERR("Failed to create L2CAP debug file"); + } + + BT_INFO("L2CAP ver %s", VERSION); + BT_INFO("L2CAP socket layer initialized"); + + return 0; + +error: + proto_unregister(&l2cap_proto); + return err; +} + +static void __exit l2cap_exit(void) +{ + debugfs_remove(l2cap_debugfs); + + flush_workqueue(_busy_wq); + destroy_workqueue(_busy_wq); + + if (bt_sock_unregister(BTPROTO_L2CAP) < 0) + BT_ERR("L2CAP socket unregistration failed"); + + if (hci_unregister_proto(&l2cap_hci_proto) < 0) + BT_ERR("L2CAP protocol unregistration failed"); + + proto_unregister(&l2cap_proto); +} + +void l2cap_load(void) +{ + /* Dummy function to trigger automatic L2CAP module loading by + * other modules that use L2CAP sockets but don't use any other + * symbols from it. */ +} +EXPORT_SYMBOL(l2cap_load); + +module_init(l2cap_init); +module_exit(l2cap_exit); + +module_param(enable_ertm, bool, 0644); +MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); + +MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); +MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); +MODULE_VERSION(VERSION); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("bt-proto-0"); diff --git a/net/bluetooth/l2cap/l2cap.c b/net/bluetooth/l2cap/l2cap.c deleted file mode 100644 index cdd608d..0000000 --- a/net/bluetooth/l2cap/l2cap.c +++ /dev/null @@ -1,4859 +0,0 @@ -/* - BlueZ - Bluetooth protocol stack for Linux - Copyright (C) 2000-2001 Qualcomm Incorporated - Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> - - Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License version 2 as - published by the Free Software Foundation; - - THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS - OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. - IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY - CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES - WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - - ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, - COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS - SOFTWARE IS DISCLAIMED. -*/ - -/* Bluetooth L2CAP core and sockets. */ - -#include <linux/module.h> - -#include <linux/types.h> -#include <linux/capability.h> -#include <linux/errno.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/slab.h> -#include <linux/poll.h> -#include <linux/fcntl.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/socket.h> -#include <linux/skbuff.h> -#include <linux/list.h> -#include <linux/device.h> -#include <linux/debugfs.h> -#include <linux/seq_file.h> -#include <linux/uaccess.h> -#include <linux/crc16.h> -#include <net/sock.h> - -#include <asm/system.h> -#include <asm/unaligned.h> - -#include <net/bluetooth/bluetooth.h> -#include <net/bluetooth/hci_core.h> -#include <net/bluetooth/l2cap.h> - -#define VERSION "2.15" - -static int enable_ertm = 0; - -static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; -static u8 l2cap_fixed_chan[8] = { 0x02, }; - -static const struct proto_ops l2cap_sock_ops; - -static struct workqueue_struct *_busy_wq; - -static struct bt_sock_list l2cap_sk_list = { - .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) -}; - -static void l2cap_busy_work(struct work_struct *work); - -static void __l2cap_sock_close(struct sock *sk, int reason); -static void l2cap_sock_close(struct sock *sk); -static void l2cap_sock_kill(struct sock *sk); - -static int l2cap_build_conf_req(struct sock *sk, void *data); -static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, - u8 code, u8 ident, u16 dlen, void *data); - -static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); - -/* ---- L2CAP timers ---- */ -static void l2cap_sock_timeout(unsigned long arg) -{ - struct sock *sk = (struct sock *) arg; - int reason; - - BT_DBG("sock %p state %d", sk, sk->sk_state); - - bh_lock_sock(sk); - - if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) - reason = ECONNREFUSED; - else if (sk->sk_state == BT_CONNECT && - l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) - reason = ECONNREFUSED; - else - reason = ETIMEDOUT; - - __l2cap_sock_close(sk, reason); - - bh_unlock_sock(sk); - - l2cap_sock_kill(sk); - sock_put(sk); -} - -static void l2cap_sock_set_timer(struct sock *sk, long timeout) -{ - BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); - sk_reset_timer(sk, &sk->sk_timer, jiffies + timeout); -} - -static void l2cap_sock_clear_timer(struct sock *sk) -{ - BT_DBG("sock %p state %d", sk, sk->sk_state); - sk_stop_timer(sk, &sk->sk_timer); -} - -/* ---- L2CAP channels ---- */ -static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid) -{ - struct sock *s; - for (s = l->head; s; s = l2cap_pi(s)->next_c) { - if (l2cap_pi(s)->dcid == cid) - break; - } - return s; -} - -static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) -{ - struct sock *s; - for (s = l->head; s; s = l2cap_pi(s)->next_c) { - if (l2cap_pi(s)->scid == cid) - break; - } - return s; -} - -/* Find channel with given SCID. - * Returns locked socket */ -static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid) -{ - struct sock *s; - read_lock(&l->lock); - s = __l2cap_get_chan_by_scid(l, cid); - if (s) - bh_lock_sock(s); - read_unlock(&l->lock); - return s; -} - -static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) -{ - struct sock *s; - for (s = l->head; s; s = l2cap_pi(s)->next_c) { - if (l2cap_pi(s)->ident == ident) - break; - } - return s; -} - -static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident) -{ - struct sock *s; - read_lock(&l->lock); - s = __l2cap_get_chan_by_ident(l, ident); - if (s) - bh_lock_sock(s); - read_unlock(&l->lock); - return s; -} - -static u16 l2cap_alloc_cid(struct l2cap_chan_list *l) -{ - u16 cid = L2CAP_CID_DYN_START; - - for (; cid < L2CAP_CID_DYN_END; cid++) { - if (!__l2cap_get_chan_by_scid(l, cid)) - return cid; - } - - return 0; -} - -static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk) -{ - sock_hold(sk); - - if (l->head) - l2cap_pi(l->head)->prev_c = sk; - - l2cap_pi(sk)->next_c = l->head; - l2cap_pi(sk)->prev_c = NULL; - l->head = sk; -} - -static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk) -{ - struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c; - - write_lock_bh(&l->lock); - if (sk == l->head) - l->head = next; - - if (next) - l2cap_pi(next)->prev_c = prev; - if (prev) - l2cap_pi(prev)->next_c = next; - write_unlock_bh(&l->lock); - - __sock_put(sk); -} - -static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) -{ - struct l2cap_chan_list *l = &conn->chan_list; - - BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, - l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid); - - conn->disc_reason = 0x13; - - l2cap_pi(sk)->conn = conn; - - if (sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) { - /* Alloc CID for connection-oriented socket */ - l2cap_pi(sk)->scid = l2cap_alloc_cid(l); - } else if (sk->sk_type == SOCK_DGRAM) { - /* Connectionless socket */ - l2cap_pi(sk)->scid = L2CAP_CID_CONN_LESS; - l2cap_pi(sk)->dcid = L2CAP_CID_CONN_LESS; - l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; - } else { - /* Raw socket can send/recv signalling messages only */ - l2cap_pi(sk)->scid = L2CAP_CID_SIGNALING; - l2cap_pi(sk)->dcid = L2CAP_CID_SIGNALING; - l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU; - } - - __l2cap_chan_link(l, sk); - - if (parent) - bt_accept_enqueue(parent, sk); -} - -/* Delete channel. - * Must be called on the locked socket. */ -static void l2cap_chan_del(struct sock *sk, int err) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct sock *parent = bt_sk(sk)->parent; - - l2cap_sock_clear_timer(sk); - - BT_DBG("sk %p, conn %p, err %d", sk, conn, err); - - if (conn) { - /* Unlink from channel list */ - l2cap_chan_unlink(&conn->chan_list, sk); - l2cap_pi(sk)->conn = NULL; - hci_conn_put(conn->hcon); - } - - sk->sk_state = BT_CLOSED; - sock_set_flag(sk, SOCK_ZAPPED); - - if (err) - sk->sk_err = err; - - if (parent) { - bt_accept_unlink(sk); - parent->sk_data_ready(parent, 0); - } else - sk->sk_state_change(sk); - - skb_queue_purge(TX_QUEUE(sk)); - - if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { - struct srej_list *l, *tmp; - - del_timer(&l2cap_pi(sk)->retrans_timer); - del_timer(&l2cap_pi(sk)->monitor_timer); - del_timer(&l2cap_pi(sk)->ack_timer); - - skb_queue_purge(SREJ_QUEUE(sk)); - skb_queue_purge(BUSY_QUEUE(sk)); - - list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { - list_del(&l->list); - kfree(l); - } - } -} - -/* Service level security */ -static inline int l2cap_check_security(struct sock *sk) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - __u8 auth_type; - - if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { - if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) - auth_type = HCI_AT_NO_BONDING_MITM; - else - auth_type = HCI_AT_NO_BONDING; - - if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) - l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; - } else { - switch (l2cap_pi(sk)->sec_level) { - case BT_SECURITY_HIGH: - auth_type = HCI_AT_GENERAL_BONDING_MITM; - break; - case BT_SECURITY_MEDIUM: - auth_type = HCI_AT_GENERAL_BONDING; - break; - default: - auth_type = HCI_AT_NO_BONDING; - break; - } - } - - return hci_conn_security(conn->hcon, l2cap_pi(sk)->sec_level, - auth_type); -} - -static inline u8 l2cap_get_ident(struct l2cap_conn *conn) -{ - u8 id; - - /* Get next available identificator. - * 1 - 128 are used by kernel. - * 129 - 199 are reserved. - * 200 - 254 are used by utilities like l2ping, etc. - */ - - spin_lock_bh(&conn->lock); - - if (++conn->tx_ident > 128) - conn->tx_ident = 1; - - id = conn->tx_ident; - - spin_unlock_bh(&conn->lock); - - return id; -} - -static inline void l2cap_send_cmd(struct l2cap_conn *conn, u8 ident, u8 code, u16 len, void *data) -{ - struct sk_buff *skb = l2cap_build_cmd(conn, code, ident, len, data); - - BT_DBG("code 0x%2.2x", code); - - if (!skb) - return; - - hci_send_acl(conn->hcon, skb, 0); -} - -static inline void l2cap_send_sframe(struct l2cap_pinfo *pi, u16 control) -{ - struct sk_buff *skb; - struct l2cap_hdr *lh; - struct l2cap_conn *conn = pi->conn; - struct sock *sk = (struct sock *)pi; - int count, hlen = L2CAP_HDR_SIZE + 2; - - if (sk->sk_state != BT_CONNECTED) - return; - - if (pi->fcs == L2CAP_FCS_CRC16) - hlen += 2; - - BT_DBG("pi %p, control 0x%2.2x", pi, control); - - count = min_t(unsigned int, conn->mtu, hlen); - control |= L2CAP_CTRL_FRAME_TYPE; - - if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { - control |= L2CAP_CTRL_FINAL; - pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; - } - - if (pi->conn_state & L2CAP_CONN_SEND_PBIT) { - control |= L2CAP_CTRL_POLL; - pi->conn_state &= ~L2CAP_CONN_SEND_PBIT; - } - - skb = bt_skb_alloc(count, GFP_ATOMIC); - if (!skb) - return; - - lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); - lh->len = cpu_to_le16(hlen - L2CAP_HDR_SIZE); - lh->cid = cpu_to_le16(pi->dcid); - put_unaligned_le16(control, skb_put(skb, 2)); - - if (pi->fcs == L2CAP_FCS_CRC16) { - u16 fcs = crc16(0, (u8 *)lh, count - 2); - put_unaligned_le16(fcs, skb_put(skb, 2)); - } - - hci_send_acl(pi->conn->hcon, skb, 0); -} - -static inline void l2cap_send_rr_or_rnr(struct l2cap_pinfo *pi, u16 control) -{ - if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { - control |= L2CAP_SUPER_RCV_NOT_READY; - pi->conn_state |= L2CAP_CONN_RNR_SENT; - } else - control |= L2CAP_SUPER_RCV_READY; - - control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; - - l2cap_send_sframe(pi, control); -} - -static inline int __l2cap_no_conn_pending(struct sock *sk) -{ - return !(l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND); -} - -static void l2cap_do_start(struct sock *sk) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - - if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) { - if (!(conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE)) - return; - - if (l2cap_check_security(sk) && __l2cap_no_conn_pending(sk)) { - struct l2cap_conn_req req; - req.scid = cpu_to_le16(l2cap_pi(sk)->scid); - req.psm = l2cap_pi(sk)->psm; - - l2cap_pi(sk)->ident = l2cap_get_ident(conn); - l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; - - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_REQ, sizeof(req), &req); - } - } else { - struct l2cap_info_req req; - req.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); - - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; - conn->info_ident = l2cap_get_ident(conn); - - mod_timer(&conn->info_timer, jiffies + - msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); - - l2cap_send_cmd(conn, conn->info_ident, - L2CAP_INFO_REQ, sizeof(req), &req); - } -} - -static inline int l2cap_mode_supported(__u8 mode, __u32 feat_mask) -{ - u32 local_feat_mask = l2cap_feat_mask; - if (enable_ertm) - local_feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING; - - switch (mode) { - case L2CAP_MODE_ERTM: - return L2CAP_FEAT_ERTM & feat_mask & local_feat_mask; - case L2CAP_MODE_STREAMING: - return L2CAP_FEAT_STREAMING & feat_mask & local_feat_mask; - default: - return 0x00; - } -} - -static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct sock *sk, int err) -{ - struct l2cap_disconn_req req; - - if (!conn) - return; - - skb_queue_purge(TX_QUEUE(sk)); - - if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) { - del_timer(&l2cap_pi(sk)->retrans_timer); - del_timer(&l2cap_pi(sk)->monitor_timer); - del_timer(&l2cap_pi(sk)->ack_timer); - } - - req.dcid = cpu_to_le16(l2cap_pi(sk)->dcid); - req.scid = cpu_to_le16(l2cap_pi(sk)->scid); - l2cap_send_cmd(conn, l2cap_get_ident(conn), - L2CAP_DISCONN_REQ, sizeof(req), &req); - - sk->sk_state = BT_DISCONN; - sk->sk_err = err; -} - -/* ---- L2CAP connections ---- */ -static void l2cap_conn_start(struct l2cap_conn *conn) -{ - struct l2cap_chan_list *l = &conn->chan_list; - struct sock_del_list del, *tmp1, *tmp2; - struct sock *sk; - - BT_DBG("conn %p", conn); - - INIT_LIST_HEAD(&del.list); - - read_lock(&l->lock); - - for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - bh_lock_sock(sk); - - if (sk->sk_type != SOCK_SEQPACKET && - sk->sk_type != SOCK_STREAM) { - bh_unlock_sock(sk); - continue; - } - - if (sk->sk_state == BT_CONNECT) { - struct l2cap_conn_req req; - - if (!l2cap_check_security(sk) || - !__l2cap_no_conn_pending(sk)) { - bh_unlock_sock(sk); - continue; - } - - if (!l2cap_mode_supported(l2cap_pi(sk)->mode, - conn->feat_mask) - && l2cap_pi(sk)->conf_state & - L2CAP_CONF_STATE2_DEVICE) { - tmp1 = kzalloc(sizeof(struct sock_del_list), - GFP_ATOMIC); - tmp1->sk = sk; - list_add_tail(&tmp1->list, &del.list); - bh_unlock_sock(sk); - continue; - } - - req.scid = cpu_to_le16(l2cap_pi(sk)->scid); - req.psm = l2cap_pi(sk)->psm; - - l2cap_pi(sk)->ident = l2cap_get_ident(conn); - l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; - - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_REQ, sizeof(req), &req); - - } else if (sk->sk_state == BT_CONNECT2) { - struct l2cap_conn_rsp rsp; - char buf[128]; - rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); - rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); - - if (l2cap_check_security(sk)) { - if (bt_sk(sk)->defer_setup) { - struct sock *parent = bt_sk(sk)->parent; - rsp.result = cpu_to_le16(L2CAP_CR_PEND); - rsp.status = cpu_to_le16(L2CAP_CS_AUTHOR_PEND); - parent->sk_data_ready(parent, 0); - - } else { - sk->sk_state = BT_CONFIG; - rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); - rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); - } - } else { - rsp.result = cpu_to_le16(L2CAP_CR_PEND); - rsp.status = cpu_to_le16(L2CAP_CS_AUTHEN_PEND); - } - - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_RSP, sizeof(rsp), &rsp); - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT || - rsp.result != L2CAP_CR_SUCCESS) { - bh_unlock_sock(sk); - continue; - } - - l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(sk, buf), buf); - l2cap_pi(sk)->num_conf_req++; - } - - bh_unlock_sock(sk); - } - - read_unlock(&l->lock); - - list_for_each_entry_safe(tmp1, tmp2, &del.list, list) { - bh_lock_sock(tmp1->sk); - __l2cap_sock_close(tmp1->sk, ECONNRESET); - bh_unlock_sock(tmp1->sk); - list_del(&tmp1->list); - kfree(tmp1); - } -} - -static void l2cap_conn_ready(struct l2cap_conn *conn) -{ - struct l2cap_chan_list *l = &conn->chan_list; - struct sock *sk; - - BT_DBG("conn %p", conn); - - read_lock(&l->lock); - - for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - bh_lock_sock(sk); - - if (sk->sk_type != SOCK_SEQPACKET && - sk->sk_type != SOCK_STREAM) { - l2cap_sock_clear_timer(sk); - sk->sk_state = BT_CONNECTED; - sk->sk_state_change(sk); - } else if (sk->sk_state == BT_CONNECT) - l2cap_do_start(sk); - - bh_unlock_sock(sk); - } - - read_unlock(&l->lock); -} - -/* Notify sockets that we cannot guaranty reliability anymore */ -static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err) -{ - struct l2cap_chan_list *l = &conn->chan_list; - struct sock *sk; - - BT_DBG("conn %p", conn); - - read_lock(&l->lock); - - for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - if (l2cap_pi(sk)->force_reliable) - sk->sk_err = err; - } - - read_unlock(&l->lock); -} - -static void l2cap_info_timeout(unsigned long arg) -{ - struct l2cap_conn *conn = (void *) arg; - - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; - conn->info_ident = 0; - - l2cap_conn_start(conn); -} - -static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - - if (conn || status) - return conn; - - conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC); - if (!conn) - return NULL; - - hcon->l2cap_data = conn; - conn->hcon = hcon; - - BT_DBG("hcon %p conn %p", hcon, conn); - - conn->mtu = hcon->hdev->acl_mtu; - conn->src = &hcon->hdev->bdaddr; - conn->dst = &hcon->dst; - - conn->feat_mask = 0; - - spin_lock_init(&conn->lock); - rwlock_init(&conn->chan_list.lock); - - setup_timer(&conn->info_timer, l2cap_info_timeout, - (unsigned long) conn); - - conn->disc_reason = 0x13; - - return conn; -} - -static void l2cap_conn_del(struct hci_conn *hcon, int err) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - struct sock *sk; - - if (!conn) - return; - - BT_DBG("hcon %p conn %p, err %d", hcon, conn, err); - - kfree_skb(conn->rx_skb); - - /* Kill channels */ - while ((sk = conn->chan_list.head)) { - bh_lock_sock(sk); - l2cap_chan_del(sk, err); - bh_unlock_sock(sk); - l2cap_sock_kill(sk); - } - - if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) - del_timer_sync(&conn->info_timer); - - hcon->l2cap_data = NULL; - kfree(conn); -} - -static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent) -{ - struct l2cap_chan_list *l = &conn->chan_list; - write_lock_bh(&l->lock); - __l2cap_chan_add(conn, sk, parent); - write_unlock_bh(&l->lock); -} - -/* ---- Socket interface ---- */ -static struct sock *__l2cap_get_sock_by_addr(__le16 psm, bdaddr_t *src) -{ - struct sock *sk; - struct hlist_node *node; - sk_for_each(sk, node, &l2cap_sk_list.head) - if (l2cap_pi(sk)->sport == psm && !bacmp(&bt_sk(sk)->src, src)) - goto found; - sk = NULL; -found: - return sk; -} - -/* Find socket with psm and source bdaddr. - * Returns closest match. - */ -static struct sock *__l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) -{ - struct sock *sk = NULL, *sk1 = NULL; - struct hlist_node *node; - - sk_for_each(sk, node, &l2cap_sk_list.head) { - if (state && sk->sk_state != state) - continue; - - if (l2cap_pi(sk)->psm == psm) { - /* Exact match. */ - if (!bacmp(&bt_sk(sk)->src, src)) - break; - - /* Closest match */ - if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) - sk1 = sk; - } - } - return node ? sk : sk1; -} - -/* Find socket with given address (psm, src). - * Returns locked socket */ -static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t *src) -{ - struct sock *s; - read_lock(&l2cap_sk_list.lock); - s = __l2cap_get_sock_by_psm(state, psm, src); - if (s) - bh_lock_sock(s); - read_unlock(&l2cap_sk_list.lock); - return s; -} - -static void l2cap_sock_destruct(struct sock *sk) -{ - BT_DBG("sk %p", sk); - - skb_queue_purge(&sk->sk_receive_queue); - skb_queue_purge(&sk->sk_write_queue); -} - -static void l2cap_sock_cleanup_listen(struct sock *parent) -{ - struct sock *sk; - - BT_DBG("parent %p", parent); - - /* Close not yet accepted channels */ - while ((sk = bt_accept_dequeue(parent, NULL))) - l2cap_sock_close(sk); - - parent->sk_state = BT_CLOSED; - sock_set_flag(parent, SOCK_ZAPPED); -} - -/* Kill socket (only if zapped and orphan) - * Must be called on unlocked socket. - */ -static void l2cap_sock_kill(struct sock *sk) -{ - if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) - return; - - BT_DBG("sk %p state %d", sk, sk->sk_state); - - /* Kill poor orphan */ - bt_sock_unlink(&l2cap_sk_list, sk); - sock_set_flag(sk, SOCK_DEAD); - sock_put(sk); -} - -static void __l2cap_sock_close(struct sock *sk, int reason) -{ - BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); - - switch (sk->sk_state) { - case BT_LISTEN: - l2cap_sock_cleanup_listen(sk); - break; - - case BT_CONNECTED: - case BT_CONFIG: - if (sk->sk_type == SOCK_SEQPACKET || - sk->sk_type == SOCK_STREAM) { - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - - l2cap_sock_set_timer(sk, sk->sk_sndtimeo); - l2cap_send_disconn_req(conn, sk, reason); - } else - l2cap_chan_del(sk, reason); - break; - - case BT_CONNECT2: - if (sk->sk_type == SOCK_SEQPACKET || - sk->sk_type == SOCK_STREAM) { - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct l2cap_conn_rsp rsp; - __u16 result; - - if (bt_sk(sk)->defer_setup) - result = L2CAP_CR_SEC_BLOCK; - else - result = L2CAP_CR_BAD_PSM; - - rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); - rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); - rsp.result = cpu_to_le16(result); - rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_RSP, sizeof(rsp), &rsp); - } else - l2cap_chan_del(sk, reason); - break; - - case BT_CONNECT: - case BT_DISCONN: - l2cap_chan_del(sk, reason); - break; - - default: - sock_set_flag(sk, SOCK_ZAPPED); - break; - } -} - -/* Must be called on unlocked socket. */ -static void l2cap_sock_close(struct sock *sk) -{ - l2cap_sock_clear_timer(sk); - lock_sock(sk); - __l2cap_sock_close(sk, ECONNRESET); - release_sock(sk); - l2cap_sock_kill(sk); -} - -static void l2cap_sock_init(struct sock *sk, struct sock *parent) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - - BT_DBG("sk %p", sk); - - if (parent) { - sk->sk_type = parent->sk_type; - bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; - - pi->imtu = l2cap_pi(parent)->imtu; - pi->omtu = l2cap_pi(parent)->omtu; - pi->conf_state = l2cap_pi(parent)->conf_state; - pi->mode = l2cap_pi(parent)->mode; - pi->fcs = l2cap_pi(parent)->fcs; - pi->max_tx = l2cap_pi(parent)->max_tx; - pi->tx_win = l2cap_pi(parent)->tx_win; - pi->sec_level = l2cap_pi(parent)->sec_level; - pi->role_switch = l2cap_pi(parent)->role_switch; - pi->force_reliable = l2cap_pi(parent)->force_reliable; - } else { - pi->imtu = L2CAP_DEFAULT_MTU; - pi->omtu = 0; - if (enable_ertm && sk->sk_type == SOCK_STREAM) { - pi->mode = L2CAP_MODE_ERTM; - pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; - } else { - pi->mode = L2CAP_MODE_BASIC; - } - pi->max_tx = L2CAP_DEFAULT_MAX_TX; - pi->fcs = L2CAP_FCS_CRC16; - pi->tx_win = L2CAP_DEFAULT_TX_WINDOW; - pi->sec_level = BT_SECURITY_LOW; - pi->role_switch = 0; - pi->force_reliable = 0; - } - - /* Default config options */ - pi->conf_len = 0; - pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; - skb_queue_head_init(TX_QUEUE(sk)); - skb_queue_head_init(SREJ_QUEUE(sk)); - skb_queue_head_init(BUSY_QUEUE(sk)); - INIT_LIST_HEAD(SREJ_LIST(sk)); -} - -static struct proto l2cap_proto = { - .name = "L2CAP", - .owner = THIS_MODULE, - .obj_size = sizeof(struct l2cap_pinfo) -}; - -static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) -{ - struct sock *sk; - - sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); - if (!sk) - return NULL; - - sock_init_data(sock, sk); - INIT_LIST_HEAD(&bt_sk(sk)->accept_q); - - sk->sk_destruct = l2cap_sock_destruct; - sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); - - sock_reset_flag(sk, SOCK_ZAPPED); - - sk->sk_protocol = proto; - sk->sk_state = BT_OPEN; - - setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); - - bt_sock_link(&l2cap_sk_list, sk); - return sk; -} - -static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, - int kern) -{ - struct sock *sk; - - BT_DBG("sock %p", sock); - - sock->state = SS_UNCONNECTED; - - if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && - sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) - return -ESOCKTNOSUPPORT; - - if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) - return -EPERM; - - sock->ops = &l2cap_sock_ops; - - sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); - if (!sk) - return -ENOMEM; - - l2cap_sock_init(sk, NULL); - return 0; -} - -static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) -{ - struct sock *sk = sock->sk; - struct sockaddr_l2 la; - int len, err = 0; - - BT_DBG("sk %p", sk); - - if (!addr || addr->sa_family != AF_BLUETOOTH) - return -EINVAL; - - memset(&la, 0, sizeof(la)); - len = min_t(unsigned int, sizeof(la), alen); - memcpy(&la, addr, len); - - if (la.l2_cid) - return -EINVAL; - - lock_sock(sk); - - if (sk->sk_state != BT_OPEN) { - err = -EBADFD; - goto done; - } - - if (la.l2_psm && __le16_to_cpu(la.l2_psm) < 0x1001 && - !capable(CAP_NET_BIND_SERVICE)) { - err = -EACCES; - goto done; - } - - write_lock_bh(&l2cap_sk_list.lock); - - if (la.l2_psm && __l2cap_get_sock_by_addr(la.l2_psm, &la.l2_bdaddr)) { - err = -EADDRINUSE; - } else { - /* Save source address */ - bacpy(&bt_sk(sk)->src, &la.l2_bdaddr); - l2cap_pi(sk)->psm = la.l2_psm; - l2cap_pi(sk)->sport = la.l2_psm; - sk->sk_state = BT_BOUND; - - if (__le16_to_cpu(la.l2_psm) == 0x0001 || - __le16_to_cpu(la.l2_psm) == 0x0003) - l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; - } - - write_unlock_bh(&l2cap_sk_list.lock); - -done: - release_sock(sk); - return err; -} - -static int l2cap_do_connect(struct sock *sk) -{ - bdaddr_t *src = &bt_sk(sk)->src; - bdaddr_t *dst = &bt_sk(sk)->dst; - struct l2cap_conn *conn; - struct hci_conn *hcon; - struct hci_dev *hdev; - __u8 auth_type; - int err; - - BT_DBG("%s -> %s psm 0x%2.2x", batostr(src), batostr(dst), - l2cap_pi(sk)->psm); - - hdev = hci_get_route(dst, src); - if (!hdev) - return -EHOSTUNREACH; - - hci_dev_lock_bh(hdev); - - err = -ENOMEM; - - if (sk->sk_type == SOCK_RAW) { - switch (l2cap_pi(sk)->sec_level) { - case BT_SECURITY_HIGH: - auth_type = HCI_AT_DEDICATED_BONDING_MITM; - break; - case BT_SECURITY_MEDIUM: - auth_type = HCI_AT_DEDICATED_BONDING; - break; - default: - auth_type = HCI_AT_NO_BONDING; - break; - } - } else if (l2cap_pi(sk)->psm == cpu_to_le16(0x0001)) { - if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) - auth_type = HCI_AT_NO_BONDING_MITM; - else - auth_type = HCI_AT_NO_BONDING; - - if (l2cap_pi(sk)->sec_level == BT_SECURITY_LOW) - l2cap_pi(sk)->sec_level = BT_SECURITY_SDP; - } else { - switch (l2cap_pi(sk)->sec_level) { - case BT_SECURITY_HIGH: - auth_type = HCI_AT_GENERAL_BONDING_MITM; - break; - case BT_SECURITY_MEDIUM: - auth_type = HCI_AT_GENERAL_BONDING; - break; - default: - auth_type = HCI_AT_NO_BONDING; - break; - } - } - - hcon = hci_connect(hdev, ACL_LINK, dst, - l2cap_pi(sk)->sec_level, auth_type); - if (!hcon) - goto done; - - conn = l2cap_conn_add(hcon, 0); - if (!conn) { - hci_conn_put(hcon); - goto done; - } - - err = 0; - - /* Update source addr of the socket */ - bacpy(src, conn->src); - - l2cap_chan_add(conn, sk, NULL); - - sk->sk_state = BT_CONNECT; - l2cap_sock_set_timer(sk, sk->sk_sndtimeo); - - if (hcon->state == BT_CONNECTED) { - if (sk->sk_type != SOCK_SEQPACKET && - sk->sk_type != SOCK_STREAM) { - l2cap_sock_clear_timer(sk); - sk->sk_state = BT_CONNECTED; - } else - l2cap_do_start(sk); - } - -done: - hci_dev_unlock_bh(hdev); - hci_dev_put(hdev); - return err; -} - -static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int alen, int flags) -{ - struct sock *sk = sock->sk; - struct sockaddr_l2 la; - int len, err = 0; - - BT_DBG("sk %p", sk); - - if (!addr || alen < sizeof(addr->sa_family) || - addr->sa_family != AF_BLUETOOTH) - return -EINVAL; - - memset(&la, 0, sizeof(la)); - len = min_t(unsigned int, sizeof(la), alen); - memcpy(&la, addr, len); - - if (la.l2_cid) - return -EINVAL; - - lock_sock(sk); - - if ((sk->sk_type == SOCK_SEQPACKET || sk->sk_type == SOCK_STREAM) - && !la.l2_psm) { - err = -EINVAL; - goto done; - } - - switch (l2cap_pi(sk)->mode) { - case L2CAP_MODE_BASIC: - break; - case L2CAP_MODE_ERTM: - case L2CAP_MODE_STREAMING: - if (enable_ertm) - break; - /* fall through */ - default: - err = -ENOTSUPP; - goto done; - } - - switch (sk->sk_state) { - case BT_CONNECT: - case BT_CONNECT2: - case BT_CONFIG: - /* Already connecting */ - goto wait; - - case BT_CONNECTED: - /* Already connected */ - err = -EISCONN; - goto done; - - case BT_OPEN: - case BT_BOUND: - /* Can connect */ - break; - - default: - err = -EBADFD; - goto done; - } - - /* Set destination address and psm */ - bacpy(&bt_sk(sk)->dst, &la.l2_bdaddr); - l2cap_pi(sk)->psm = la.l2_psm; - - err = l2cap_do_connect(sk); - if (err) - goto done; - -wait: - err = bt_sock_wait_state(sk, BT_CONNECTED, - sock_sndtimeo(sk, flags & O_NONBLOCK)); -done: - release_sock(sk); - return err; -} - -static int l2cap_sock_listen(struct socket *sock, int backlog) -{ - struct sock *sk = sock->sk; - int err = 0; - - BT_DBG("sk %p backlog %d", sk, backlog); - - lock_sock(sk); - - if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) - || sk->sk_state != BT_BOUND) { - err = -EBADFD; - goto done; - } - - switch (l2cap_pi(sk)->mode) { - case L2CAP_MODE_BASIC: - break; - case L2CAP_MODE_ERTM: - case L2CAP_MODE_STREAMING: - if (enable_ertm) - break; - /* fall through */ - default: - err = -ENOTSUPP; - goto done; - } - - if (!l2cap_pi(sk)->psm) { - bdaddr_t *src = &bt_sk(sk)->src; - u16 psm; - - err = -EINVAL; - - write_lock_bh(&l2cap_sk_list.lock); - - for (psm = 0x1001; psm < 0x1100; psm += 2) - if (!__l2cap_get_sock_by_addr(cpu_to_le16(psm), src)) { - l2cap_pi(sk)->psm = cpu_to_le16(psm); - l2cap_pi(sk)->sport = cpu_to_le16(psm); - err = 0; - break; - } - - write_unlock_bh(&l2cap_sk_list.lock); - - if (err < 0) - goto done; - } - - sk->sk_max_ack_backlog = backlog; - sk->sk_ack_backlog = 0; - sk->sk_state = BT_LISTEN; - -done: - release_sock(sk); - return err; -} - -static int l2cap_sock_accept(struct socket *sock, struct socket *newsock, int flags) -{ - DECLARE_WAITQUEUE(wait, current); - struct sock *sk = sock->sk, *nsk; - long timeo; - int err = 0; - - lock_sock_nested(sk, SINGLE_DEPTH_NESTING); - - if (sk->sk_state != BT_LISTEN) { - err = -EBADFD; - goto done; - } - - timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); - - BT_DBG("sk %p timeo %ld", sk, timeo); - - /* Wait for an incoming connection. (wake-one). */ - add_wait_queue_exclusive(sk_sleep(sk), &wait); - while (!(nsk = bt_accept_dequeue(sk, newsock))) { - set_current_state(TASK_INTERRUPTIBLE); - if (!timeo) { - err = -EAGAIN; - break; - } - - release_sock(sk); - timeo = schedule_timeout(timeo); - lock_sock_nested(sk, SINGLE_DEPTH_NESTING); - - if (sk->sk_state != BT_LISTEN) { - err = -EBADFD; - break; - } - - if (signal_pending(current)) { - err = sock_intr_errno(timeo); - break; - } - } - set_current_state(TASK_RUNNING); - remove_wait_queue(sk_sleep(sk), &wait); - - if (err) - goto done; - - newsock->state = SS_CONNECTED; - - BT_DBG("new socket %p", nsk); - -done: - release_sock(sk); - return err; -} - -static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr, int *len, int peer) -{ - struct sockaddr_l2 *la = (struct sockaddr_l2 *) addr; - struct sock *sk = sock->sk; - - BT_DBG("sock %p, sk %p", sock, sk); - - addr->sa_family = AF_BLUETOOTH; - *len = sizeof(struct sockaddr_l2); - - if (peer) { - la->l2_psm = l2cap_pi(sk)->psm; - bacpy(&la->l2_bdaddr, &bt_sk(sk)->dst); - la->l2_cid = cpu_to_le16(l2cap_pi(sk)->dcid); - } else { - la->l2_psm = l2cap_pi(sk)->sport; - bacpy(&la->l2_bdaddr, &bt_sk(sk)->src); - la->l2_cid = cpu_to_le16(l2cap_pi(sk)->scid); - } - - return 0; -} - -static int __l2cap_wait_ack(struct sock *sk) -{ - DECLARE_WAITQUEUE(wait, current); - int err = 0; - int timeo = HZ/5; - - add_wait_queue(sk_sleep(sk), &wait); - while ((l2cap_pi(sk)->unacked_frames > 0 && l2cap_pi(sk)->conn)) { - set_current_state(TASK_INTERRUPTIBLE); - - if (!timeo) - timeo = HZ/5; - - if (signal_pending(current)) { - err = sock_intr_errno(timeo); - break; - } - - release_sock(sk); - timeo = schedule_timeout(timeo); - lock_sock(sk); - - err = sock_error(sk); - if (err) - break; - } - set_current_state(TASK_RUNNING); - remove_wait_queue(sk_sleep(sk), &wait); - return err; -} - -static void l2cap_monitor_timeout(unsigned long arg) -{ - struct sock *sk = (void *) arg; - - BT_DBG("sk %p", sk); - - bh_lock_sock(sk); - if (l2cap_pi(sk)->retry_count >= l2cap_pi(sk)->remote_max_tx) { - l2cap_send_disconn_req(l2cap_pi(sk)->conn, sk, ECONNABORTED); - bh_unlock_sock(sk); - return; - } - - l2cap_pi(sk)->retry_count++; - __mod_monitor_timer(); - - l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); - bh_unlock_sock(sk); -} - -static void l2cap_retrans_timeout(unsigned long arg) -{ - struct sock *sk = (void *) arg; - - BT_DBG("sk %p", sk); - - bh_lock_sock(sk); - l2cap_pi(sk)->retry_count = 1; - __mod_monitor_timer(); - - l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; - - l2cap_send_rr_or_rnr(l2cap_pi(sk), L2CAP_CTRL_POLL); - bh_unlock_sock(sk); -} - -static void l2cap_drop_acked_frames(struct sock *sk) -{ - struct sk_buff *skb; - - while ((skb = skb_peek(TX_QUEUE(sk))) && - l2cap_pi(sk)->unacked_frames) { - if (bt_cb(skb)->tx_seq == l2cap_pi(sk)->expected_ack_seq) - break; - - skb = skb_dequeue(TX_QUEUE(sk)); - kfree_skb(skb); - - l2cap_pi(sk)->unacked_frames--; - } - - if (!l2cap_pi(sk)->unacked_frames) - del_timer(&l2cap_pi(sk)->retrans_timer); -} - -static inline void l2cap_do_send(struct sock *sk, struct sk_buff *skb) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - - BT_DBG("sk %p, skb %p len %d", sk, skb, skb->len); - - hci_send_acl(pi->conn->hcon, skb, 0); -} - -static void l2cap_streaming_send(struct sock *sk) -{ - struct sk_buff *skb, *tx_skb; - struct l2cap_pinfo *pi = l2cap_pi(sk); - u16 control, fcs; - - while ((skb = sk->sk_send_head)) { - tx_skb = skb_clone(skb, GFP_ATOMIC); - - control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); - control |= pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT; - put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); - - if (pi->fcs == L2CAP_FCS_CRC16) { - fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); - put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); - } - - l2cap_do_send(sk, tx_skb); - - pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; - - if (skb_queue_is_last(TX_QUEUE(sk), skb)) - sk->sk_send_head = NULL; - else - sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); - - skb = skb_dequeue(TX_QUEUE(sk)); - kfree_skb(skb); - } -} - -static void l2cap_retransmit_one_frame(struct sock *sk, u8 tx_seq) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *skb, *tx_skb; - u16 control, fcs; - - skb = skb_peek(TX_QUEUE(sk)); - if (!skb) - return; - - do { - if (bt_cb(skb)->tx_seq == tx_seq) - break; - - if (skb_queue_is_last(TX_QUEUE(sk), skb)) - return; - - } while ((skb = skb_queue_next(TX_QUEUE(sk), skb))); - - if (pi->remote_max_tx && - bt_cb(skb)->retries == pi->remote_max_tx) { - l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); - return; - } - - tx_skb = skb_clone(skb, GFP_ATOMIC); - bt_cb(skb)->retries++; - control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); - - if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { - control |= L2CAP_CTRL_FINAL; - pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; - } - - control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) - | (tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); - - put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); - - if (pi->fcs == L2CAP_FCS_CRC16) { - fcs = crc16(0, (u8 *)tx_skb->data, tx_skb->len - 2); - put_unaligned_le16(fcs, tx_skb->data + tx_skb->len - 2); - } - - l2cap_do_send(sk, tx_skb); -} - -static int l2cap_ertm_send(struct sock *sk) -{ - struct sk_buff *skb, *tx_skb; - struct l2cap_pinfo *pi = l2cap_pi(sk); - u16 control, fcs; - int nsent = 0; - - if (sk->sk_state != BT_CONNECTED) - return -ENOTCONN; - - while ((skb = sk->sk_send_head) && (!l2cap_tx_window_full(sk))) { - - if (pi->remote_max_tx && - bt_cb(skb)->retries == pi->remote_max_tx) { - l2cap_send_disconn_req(pi->conn, sk, ECONNABORTED); - break; - } - - tx_skb = skb_clone(skb, GFP_ATOMIC); - - bt_cb(skb)->retries++; - - control = get_unaligned_le16(tx_skb->data + L2CAP_HDR_SIZE); - control &= L2CAP_CTRL_SAR; - - if (pi->conn_state & L2CAP_CONN_SEND_FBIT) { - control |= L2CAP_CTRL_FINAL; - pi->conn_state &= ~L2CAP_CONN_SEND_FBIT; - } - control |= (pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT) - | (pi->next_tx_seq << L2CAP_CTRL_TXSEQ_SHIFT); - put_unaligned_le16(control, tx_skb->data + L2CAP_HDR_SIZE); - - - if (pi->fcs == L2CAP_FCS_CRC16) { - fcs = crc16(0, (u8 *)skb->data, tx_skb->len - 2); - put_unaligned_le16(fcs, skb->data + tx_skb->len - 2); - } - - l2cap_do_send(sk, tx_skb); - - __mod_retrans_timer(); - - bt_cb(skb)->tx_seq = pi->next_tx_seq; - pi->next_tx_seq = (pi->next_tx_seq + 1) % 64; - - pi->unacked_frames++; - pi->frames_sent++; - - if (skb_queue_is_last(TX_QUEUE(sk), skb)) - sk->sk_send_head = NULL; - else - sk->sk_send_head = skb_queue_next(TX_QUEUE(sk), skb); - - nsent++; - } - - return nsent; -} - -static int l2cap_retransmit_frames(struct sock *sk) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - int ret; - - if (!skb_queue_empty(TX_QUEUE(sk))) - sk->sk_send_head = TX_QUEUE(sk)->next; - - pi->next_tx_seq = pi->expected_ack_seq; - ret = l2cap_ertm_send(sk); - return ret; -} - -static void l2cap_send_ack(struct l2cap_pinfo *pi) -{ - struct sock *sk = (struct sock *)pi; - u16 control = 0; - - control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; - - if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { - control |= L2CAP_SUPER_RCV_NOT_READY; - pi->conn_state |= L2CAP_CONN_RNR_SENT; - l2cap_send_sframe(pi, control); - return; - } - - if (l2cap_ertm_send(sk) > 0) - return; - - control |= L2CAP_SUPER_RCV_READY; - l2cap_send_sframe(pi, control); -} - -static void l2cap_send_srejtail(struct sock *sk) -{ - struct srej_list *tail; - u16 control; - - control = L2CAP_SUPER_SELECT_REJECT; - control |= L2CAP_CTRL_FINAL; - - tail = list_entry(SREJ_LIST(sk)->prev, struct srej_list, list); - control |= tail->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; - - l2cap_send_sframe(l2cap_pi(sk), control); -} - -static inline int l2cap_skbuff_fromiovec(struct sock *sk, struct msghdr *msg, int len, int count, struct sk_buff *skb) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct sk_buff **frag; - int err, sent = 0; - - if (memcpy_fromiovec(skb_put(skb, count), msg->msg_iov, count)) - return -EFAULT; - - sent += count; - len -= count; - - /* Continuation fragments (no L2CAP header) */ - frag = &skb_shinfo(skb)->frag_list; - while (len) { - count = min_t(unsigned int, conn->mtu, len); - - *frag = bt_skb_send_alloc(sk, count, msg->msg_flags & MSG_DONTWAIT, &err); - if (!*frag) - return -EFAULT; - if (memcpy_fromiovec(skb_put(*frag, count), msg->msg_iov, count)) - return -EFAULT; - - sent += count; - len -= count; - - frag = &(*frag)->next; - } - - return sent; -} - -static struct sk_buff *l2cap_create_connless_pdu(struct sock *sk, struct msghdr *msg, size_t len) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct sk_buff *skb; - int err, count, hlen = L2CAP_HDR_SIZE + 2; - struct l2cap_hdr *lh; - - BT_DBG("sk %p len %d", sk, (int)len); - - count = min_t(unsigned int, (conn->mtu - hlen), len); - skb = bt_skb_send_alloc(sk, count + hlen, - msg->msg_flags & MSG_DONTWAIT, &err); - if (!skb) - return ERR_PTR(-ENOMEM); - - /* Create L2CAP header */ - lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); - lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); - lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); - put_unaligned_le16(l2cap_pi(sk)->psm, skb_put(skb, 2)); - - err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); - if (unlikely(err < 0)) { - kfree_skb(skb); - return ERR_PTR(err); - } - return skb; -} - -static struct sk_buff *l2cap_create_basic_pdu(struct sock *sk, struct msghdr *msg, size_t len) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct sk_buff *skb; - int err, count, hlen = L2CAP_HDR_SIZE; - struct l2cap_hdr *lh; - - BT_DBG("sk %p len %d", sk, (int)len); - - count = min_t(unsigned int, (conn->mtu - hlen), len); - skb = bt_skb_send_alloc(sk, count + hlen, - msg->msg_flags & MSG_DONTWAIT, &err); - if (!skb) - return ERR_PTR(-ENOMEM); - - /* Create L2CAP header */ - lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); - lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); - lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); - - err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); - if (unlikely(err < 0)) { - kfree_skb(skb); - return ERR_PTR(err); - } - return skb; -} - -static struct sk_buff *l2cap_create_iframe_pdu(struct sock *sk, struct msghdr *msg, size_t len, u16 control, u16 sdulen) -{ - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - struct sk_buff *skb; - int err, count, hlen = L2CAP_HDR_SIZE + 2; - struct l2cap_hdr *lh; - - BT_DBG("sk %p len %d", sk, (int)len); - - if (!conn) - return ERR_PTR(-ENOTCONN); - - if (sdulen) - hlen += 2; - - if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) - hlen += 2; - - count = min_t(unsigned int, (conn->mtu - hlen), len); - skb = bt_skb_send_alloc(sk, count + hlen, - msg->msg_flags & MSG_DONTWAIT, &err); - if (!skb) - return ERR_PTR(-ENOMEM); - - /* Create L2CAP header */ - lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); - lh->cid = cpu_to_le16(l2cap_pi(sk)->dcid); - lh->len = cpu_to_le16(len + (hlen - L2CAP_HDR_SIZE)); - put_unaligned_le16(control, skb_put(skb, 2)); - if (sdulen) - put_unaligned_le16(sdulen, skb_put(skb, 2)); - - err = l2cap_skbuff_fromiovec(sk, msg, len, count, skb); - if (unlikely(err < 0)) { - kfree_skb(skb); - return ERR_PTR(err); - } - - if (l2cap_pi(sk)->fcs == L2CAP_FCS_CRC16) - put_unaligned_le16(0, skb_put(skb, 2)); - - bt_cb(skb)->retries = 0; - return skb; -} - -static inline int l2cap_sar_segment_sdu(struct sock *sk, struct msghdr *msg, size_t len) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *skb; - struct sk_buff_head sar_queue; - u16 control; - size_t size = 0; - - skb_queue_head_init(&sar_queue); - control = L2CAP_SDU_START; - skb = l2cap_create_iframe_pdu(sk, msg, pi->remote_mps, control, len); - if (IS_ERR(skb)) - return PTR_ERR(skb); - - __skb_queue_tail(&sar_queue, skb); - len -= pi->remote_mps; - size += pi->remote_mps; - - while (len > 0) { - size_t buflen; - - if (len > pi->remote_mps) { - control = L2CAP_SDU_CONTINUE; - buflen = pi->remote_mps; - } else { - control = L2CAP_SDU_END; - buflen = len; - } - - skb = l2cap_create_iframe_pdu(sk, msg, buflen, control, 0); - if (IS_ERR(skb)) { - skb_queue_purge(&sar_queue); - return PTR_ERR(skb); - } - - __skb_queue_tail(&sar_queue, skb); - len -= buflen; - size += buflen; - } - skb_queue_splice_tail(&sar_queue, TX_QUEUE(sk)); - if (sk->sk_send_head == NULL) - sk->sk_send_head = sar_queue.next; - - return size; -} - -static int l2cap_sock_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len) -{ - struct sock *sk = sock->sk; - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *skb; - u16 control; - int err; - - BT_DBG("sock %p, sk %p", sock, sk); - - err = sock_error(sk); - if (err) - return err; - - if (msg->msg_flags & MSG_OOB) - return -EOPNOTSUPP; - - lock_sock(sk); - - if (sk->sk_state != BT_CONNECTED) { - err = -ENOTCONN; - goto done; - } - - /* Connectionless channel */ - if (sk->sk_type == SOCK_DGRAM) { - skb = l2cap_create_connless_pdu(sk, msg, len); - if (IS_ERR(skb)) { - err = PTR_ERR(skb); - } else { - l2cap_do_send(sk, skb); - err = len; - } - goto done; - } - - switch (pi->mode) { - case L2CAP_MODE_BASIC: - /* Check outgoing MTU */ - if (len > pi->omtu) { - err = -EMSGSIZE; - goto done; - } - - /* Create a basic PDU */ - skb = l2cap_create_basic_pdu(sk, msg, len); - if (IS_ERR(skb)) { - err = PTR_ERR(skb); - goto done; - } - - l2cap_do_send(sk, skb); - err = len; - break; - - case L2CAP_MODE_ERTM: - case L2CAP_MODE_STREAMING: - /* Entire SDU fits into one PDU */ - if (len <= pi->remote_mps) { - control = L2CAP_SDU_UNSEGMENTED; - skb = l2cap_create_iframe_pdu(sk, msg, len, control, 0); - if (IS_ERR(skb)) { - err = PTR_ERR(skb); - goto done; - } - __skb_queue_tail(TX_QUEUE(sk), skb); - - if (sk->sk_send_head == NULL) - sk->sk_send_head = skb; - - } else { - /* Segment SDU into multiples PDUs */ - err = l2cap_sar_segment_sdu(sk, msg, len); - if (err < 0) - goto done; - } - - if (pi->mode == L2CAP_MODE_STREAMING) { - l2cap_streaming_send(sk); - } else { - if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY && - pi->conn_state && L2CAP_CONN_WAIT_F) { - err = len; - break; - } - err = l2cap_ertm_send(sk); - } - - if (err >= 0) - err = len; - break; - - default: - BT_DBG("bad state %1.1x", pi->mode); - err = -EBADFD; - } - -done: - release_sock(sk); - return err; -} - -static int l2cap_sock_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t len, int flags) -{ - struct sock *sk = sock->sk; - - lock_sock(sk); - - if (sk->sk_state == BT_CONNECT2 && bt_sk(sk)->defer_setup) { - struct l2cap_conn_rsp rsp; - struct l2cap_conn *conn = l2cap_pi(sk)->conn; - u8 buf[128]; - - sk->sk_state = BT_CONFIG; - - rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); - rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); - rsp.result = cpu_to_le16(L2CAP_CR_SUCCESS); - rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); - l2cap_send_cmd(l2cap_pi(sk)->conn, l2cap_pi(sk)->ident, - L2CAP_CONN_RSP, sizeof(rsp), &rsp); - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) { - release_sock(sk); - return 0; - } - - l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(sk, buf), buf); - l2cap_pi(sk)->num_conf_req++; - - release_sock(sk); - return 0; - } - - release_sock(sk); - - return bt_sock_recvmsg(iocb, sock, msg, len, flags); -} - -static int l2cap_sock_setsockopt_old(struct socket *sock, int optname, char __user *optval, unsigned int optlen) -{ - struct sock *sk = sock->sk; - struct l2cap_options opts; - int len, err = 0; - u32 opt; - - BT_DBG("sk %p", sk); - - lock_sock(sk); - - switch (optname) { - case L2CAP_OPTIONS: - opts.imtu = l2cap_pi(sk)->imtu; - opts.omtu = l2cap_pi(sk)->omtu; - opts.flush_to = l2cap_pi(sk)->flush_to; - opts.mode = l2cap_pi(sk)->mode; - opts.fcs = l2cap_pi(sk)->fcs; - opts.max_tx = l2cap_pi(sk)->max_tx; - opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; - - len = min_t(unsigned int, sizeof(opts), optlen); - if (copy_from_user((char *) &opts, optval, len)) { - err = -EFAULT; - break; - } - - if (opts.txwin_size > L2CAP_DEFAULT_TX_WINDOW) { - err = -EINVAL; - break; - } - - l2cap_pi(sk)->mode = opts.mode; - switch (l2cap_pi(sk)->mode) { - case L2CAP_MODE_BASIC: - l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_STATE2_DEVICE; - break; - case L2CAP_MODE_ERTM: - case L2CAP_MODE_STREAMING: - if (enable_ertm) - break; - /* fall through */ - default: - err = -EINVAL; - break; - } - - l2cap_pi(sk)->imtu = opts.imtu; - l2cap_pi(sk)->omtu = opts.omtu; - l2cap_pi(sk)->fcs = opts.fcs; - l2cap_pi(sk)->max_tx = opts.max_tx; - l2cap_pi(sk)->tx_win = (__u8)opts.txwin_size; - break; - - case L2CAP_LM: - if (get_user(opt, (u32 __user *) optval)) { - err = -EFAULT; - break; - } - - if (opt & L2CAP_LM_AUTH) - l2cap_pi(sk)->sec_level = BT_SECURITY_LOW; - if (opt & L2CAP_LM_ENCRYPT) - l2cap_pi(sk)->sec_level = BT_SECURITY_MEDIUM; - if (opt & L2CAP_LM_SECURE) - l2cap_pi(sk)->sec_level = BT_SECURITY_HIGH; - - l2cap_pi(sk)->role_switch = (opt & L2CAP_LM_MASTER); - l2cap_pi(sk)->force_reliable = (opt & L2CAP_LM_RELIABLE); - break; - - default: - err = -ENOPROTOOPT; - break; - } - - release_sock(sk); - return err; -} - -static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) -{ - struct sock *sk = sock->sk; - struct bt_security sec; - int len, err = 0; - u32 opt; - - BT_DBG("sk %p", sk); - - if (level == SOL_L2CAP) - return l2cap_sock_setsockopt_old(sock, optname, optval, optlen); - - if (level != SOL_BLUETOOTH) - return -ENOPROTOOPT; - - lock_sock(sk); - - switch (optname) { - case BT_SECURITY: - if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM - && sk->sk_type != SOCK_RAW) { - err = -EINVAL; - break; - } - - sec.level = BT_SECURITY_LOW; - - len = min_t(unsigned int, sizeof(sec), optlen); - if (copy_from_user((char *) &sec, optval, len)) { - err = -EFAULT; - break; - } - - if (sec.level < BT_SECURITY_LOW || - sec.level > BT_SECURITY_HIGH) { - err = -EINVAL; - break; - } - - l2cap_pi(sk)->sec_level = sec.level; - break; - - case BT_DEFER_SETUP: - if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { - err = -EINVAL; - break; - } - - if (get_user(opt, (u32 __user *) optval)) { - err = -EFAULT; - break; - } - - bt_sk(sk)->defer_setup = opt; - break; - - default: - err = -ENOPROTOOPT; - break; - } - - release_sock(sk); - return err; -} - -static int l2cap_sock_getsockopt_old(struct socket *sock, int optname, char __user *optval, int __user *optlen) -{ - struct sock *sk = sock->sk; - struct l2cap_options opts; - struct l2cap_conninfo cinfo; - int len, err = 0; - u32 opt; - - BT_DBG("sk %p", sk); - - if (get_user(len, optlen)) - return -EFAULT; - - lock_sock(sk); - - switch (optname) { - case L2CAP_OPTIONS: - opts.imtu = l2cap_pi(sk)->imtu; - opts.omtu = l2cap_pi(sk)->omtu; - opts.flush_to = l2cap_pi(sk)->flush_to; - opts.mode = l2cap_pi(sk)->mode; - opts.fcs = l2cap_pi(sk)->fcs; - opts.max_tx = l2cap_pi(sk)->max_tx; - opts.txwin_size = (__u16)l2cap_pi(sk)->tx_win; - - len = min_t(unsigned int, len, sizeof(opts)); - if (copy_to_user(optval, (char *) &opts, len)) - err = -EFAULT; - - break; - - case L2CAP_LM: - switch (l2cap_pi(sk)->sec_level) { - case BT_SECURITY_LOW: - opt = L2CAP_LM_AUTH; - break; - case BT_SECURITY_MEDIUM: - opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT; - break; - case BT_SECURITY_HIGH: - opt = L2CAP_LM_AUTH | L2CAP_LM_ENCRYPT | - L2CAP_LM_SECURE; - break; - default: - opt = 0; - break; - } - - if (l2cap_pi(sk)->role_switch) - opt |= L2CAP_LM_MASTER; - - if (l2cap_pi(sk)->force_reliable) - opt |= L2CAP_LM_RELIABLE; - - if (put_user(opt, (u32 __user *) optval)) - err = -EFAULT; - break; - - case L2CAP_CONNINFO: - if (sk->sk_state != BT_CONNECTED && - !(sk->sk_state == BT_CONNECT2 && - bt_sk(sk)->defer_setup)) { - err = -ENOTCONN; - break; - } - - cinfo.hci_handle = l2cap_pi(sk)->conn->hcon->handle; - memcpy(cinfo.dev_class, l2cap_pi(sk)->conn->hcon->dev_class, 3); - - len = min_t(unsigned int, len, sizeof(cinfo)); - if (copy_to_user(optval, (char *) &cinfo, len)) - err = -EFAULT; - - break; - - default: - err = -ENOPROTOOPT; - break; - } - - release_sock(sk); - return err; -} - -static int l2cap_sock_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) -{ - struct sock *sk = sock->sk; - struct bt_security sec; - int len, err = 0; - - BT_DBG("sk %p", sk); - - if (level == SOL_L2CAP) - return l2cap_sock_getsockopt_old(sock, optname, optval, optlen); - - if (level != SOL_BLUETOOTH) - return -ENOPROTOOPT; - - if (get_user(len, optlen)) - return -EFAULT; - - lock_sock(sk); - - switch (optname) { - case BT_SECURITY: - if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM - && sk->sk_type != SOCK_RAW) { - err = -EINVAL; - break; - } - - sec.level = l2cap_pi(sk)->sec_level; - - len = min_t(unsigned int, len, sizeof(sec)); - if (copy_to_user(optval, (char *) &sec, len)) - err = -EFAULT; - - break; - - case BT_DEFER_SETUP: - if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) { - err = -EINVAL; - break; - } - - if (put_user(bt_sk(sk)->defer_setup, (u32 __user *) optval)) - err = -EFAULT; - - break; - - default: - err = -ENOPROTOOPT; - break; - } - - release_sock(sk); - return err; -} - -static int l2cap_sock_shutdown(struct socket *sock, int how) -{ - struct sock *sk = sock->sk; - int err = 0; - - BT_DBG("sock %p, sk %p", sock, sk); - - if (!sk) - return 0; - - lock_sock(sk); - if (!sk->sk_shutdown) { - if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) - err = __l2cap_wait_ack(sk); - - sk->sk_shutdown = SHUTDOWN_MASK; - l2cap_sock_clear_timer(sk); - __l2cap_sock_close(sk, 0); - - if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) - err = bt_sock_wait_state(sk, BT_CLOSED, - sk->sk_lingertime); - } - - if (!err && sk->sk_err) - err = -sk->sk_err; - - release_sock(sk); - return err; -} - -static int l2cap_sock_release(struct socket *sock) -{ - struct sock *sk = sock->sk; - int err; - - BT_DBG("sock %p, sk %p", sock, sk); - - if (!sk) - return 0; - - err = l2cap_sock_shutdown(sock, 2); - - sock_orphan(sk); - l2cap_sock_kill(sk); - return err; -} - -static void l2cap_chan_ready(struct sock *sk) -{ - struct sock *parent = bt_sk(sk)->parent; - - BT_DBG("sk %p, parent %p", sk, parent); - - l2cap_pi(sk)->conf_state = 0; - l2cap_sock_clear_timer(sk); - - if (!parent) { - /* Outgoing channel. - * Wake up socket sleeping on connect. - */ - sk->sk_state = BT_CONNECTED; - sk->sk_state_change(sk); - } else { - /* Incoming channel. - * Wake up socket sleeping on accept. - */ - parent->sk_data_ready(parent, 0); - } -} - -/* Copy frame to all raw sockets on that connection */ -static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb) -{ - struct l2cap_chan_list *l = &conn->chan_list; - struct sk_buff *nskb; - struct sock *sk; - - BT_DBG("conn %p", conn); - - read_lock(&l->lock); - for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - if (sk->sk_type != SOCK_RAW) - continue; - - /* Don't send frame to the socket it came from */ - if (skb->sk == sk) - continue; - nskb = skb_clone(skb, GFP_ATOMIC); - if (!nskb) - continue; - - if (sock_queue_rcv_skb(sk, nskb)) - kfree_skb(nskb); - } - read_unlock(&l->lock); -} - -/* ---- L2CAP signalling commands ---- */ -static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, - u8 code, u8 ident, u16 dlen, void *data) -{ - struct sk_buff *skb, **frag; - struct l2cap_cmd_hdr *cmd; - struct l2cap_hdr *lh; - int len, count; - - BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %d", - conn, code, ident, dlen); - - len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen; - count = min_t(unsigned int, conn->mtu, len); - - skb = bt_skb_alloc(count, GFP_ATOMIC); - if (!skb) - return NULL; - - lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE); - lh->len = cpu_to_le16(L2CAP_CMD_HDR_SIZE + dlen); - lh->cid = cpu_to_le16(L2CAP_CID_SIGNALING); - - cmd = (struct l2cap_cmd_hdr *) skb_put(skb, L2CAP_CMD_HDR_SIZE); - cmd->code = code; - cmd->ident = ident; - cmd->len = cpu_to_le16(dlen); - - if (dlen) { - count -= L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE; - memcpy(skb_put(skb, count), data, count); - data += count; - } - - len -= skb->len; - - /* Continuation fragments (no L2CAP header) */ - frag = &skb_shinfo(skb)->frag_list; - while (len) { - count = min_t(unsigned int, conn->mtu, len); - - *frag = bt_skb_alloc(count, GFP_ATOMIC); - if (!*frag) - goto fail; - - memcpy(skb_put(*frag, count), data, count); - - len -= count; - data += count; - - frag = &(*frag)->next; - } - - return skb; - -fail: - kfree_skb(skb); - return NULL; -} - -static inline int l2cap_get_conf_opt(void **ptr, int *type, int *olen, unsigned long *val) -{ - struct l2cap_conf_opt *opt = *ptr; - int len; - - len = L2CAP_CONF_OPT_SIZE + opt->len; - *ptr += len; - - *type = opt->type; - *olen = opt->len; - - switch (opt->len) { - case 1: - *val = *((u8 *) opt->val); - break; - - case 2: - *val = __le16_to_cpu(*((__le16 *) opt->val)); - break; - - case 4: - *val = __le32_to_cpu(*((__le32 *) opt->val)); - break; - - default: - *val = (unsigned long) opt->val; - break; - } - - BT_DBG("type 0x%2.2x len %d val 0x%lx", *type, opt->len, *val); - return len; -} - -static void l2cap_add_conf_opt(void **ptr, u8 type, u8 len, unsigned long val) -{ - struct l2cap_conf_opt *opt = *ptr; - - BT_DBG("type 0x%2.2x len %d val 0x%lx", type, len, val); - - opt->type = type; - opt->len = len; - - switch (len) { - case 1: - *((u8 *) opt->val) = val; - break; - - case 2: - *((__le16 *) opt->val) = cpu_to_le16(val); - break; - - case 4: - *((__le32 *) opt->val) = cpu_to_le32(val); - break; - - default: - memcpy(opt->val, (void *) val, len); - break; - } - - *ptr += L2CAP_CONF_OPT_SIZE + len; -} - -static void l2cap_ack_timeout(unsigned long arg) -{ - struct sock *sk = (void *) arg; - - bh_lock_sock(sk); - l2cap_send_ack(l2cap_pi(sk)); - bh_unlock_sock(sk); -} - -static inline void l2cap_ertm_init(struct sock *sk) -{ - l2cap_pi(sk)->expected_ack_seq = 0; - l2cap_pi(sk)->unacked_frames = 0; - l2cap_pi(sk)->buffer_seq = 0; - l2cap_pi(sk)->num_acked = 0; - l2cap_pi(sk)->frames_sent = 0; - - setup_timer(&l2cap_pi(sk)->retrans_timer, - l2cap_retrans_timeout, (unsigned long) sk); - setup_timer(&l2cap_pi(sk)->monitor_timer, - l2cap_monitor_timeout, (unsigned long) sk); - setup_timer(&l2cap_pi(sk)->ack_timer, - l2cap_ack_timeout, (unsigned long) sk); - - __skb_queue_head_init(SREJ_QUEUE(sk)); - __skb_queue_head_init(BUSY_QUEUE(sk)); - - INIT_WORK(&l2cap_pi(sk)->busy_work, l2cap_busy_work); - - sk->sk_backlog_rcv = l2cap_ertm_data_rcv; -} - -static inline __u8 l2cap_select_mode(__u8 mode, __u16 remote_feat_mask) -{ - switch (mode) { - case L2CAP_MODE_STREAMING: - case L2CAP_MODE_ERTM: - if (l2cap_mode_supported(mode, remote_feat_mask)) - return mode; - /* fall through */ - default: - return L2CAP_MODE_BASIC; - } -} - -static int l2cap_build_conf_req(struct sock *sk, void *data) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct l2cap_conf_req *req = data; - struct l2cap_conf_rfc rfc = { .mode = pi->mode }; - void *ptr = req->data; - - BT_DBG("sk %p", sk); - - if (pi->num_conf_req || pi->num_conf_rsp) - goto done; - - switch (pi->mode) { - case L2CAP_MODE_STREAMING: - case L2CAP_MODE_ERTM: - if (pi->conf_state & L2CAP_CONF_STATE2_DEVICE) - break; - - /* fall through */ - default: - pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask); - break; - } - -done: - switch (pi->mode) { - case L2CAP_MODE_BASIC: - if (pi->imtu != L2CAP_DEFAULT_MTU) - l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->imtu); - - rfc.mode = L2CAP_MODE_BASIC; - rfc.txwin_size = 0; - rfc.max_transmit = 0; - rfc.retrans_timeout = 0; - rfc.monitor_timeout = 0; - rfc.max_pdu_size = 0; - - break; - - case L2CAP_MODE_ERTM: - rfc.mode = L2CAP_MODE_ERTM; - rfc.txwin_size = pi->tx_win; - rfc.max_transmit = pi->max_tx; - rfc.retrans_timeout = 0; - rfc.monitor_timeout = 0; - rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); - if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) - rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); - - if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) - break; - - if (pi->fcs == L2CAP_FCS_NONE || - pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { - pi->fcs = L2CAP_FCS_NONE; - l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); - } - break; - - case L2CAP_MODE_STREAMING: - rfc.mode = L2CAP_MODE_STREAMING; - rfc.txwin_size = 0; - rfc.max_transmit = 0; - rfc.retrans_timeout = 0; - rfc.monitor_timeout = 0; - rfc.max_pdu_size = cpu_to_le16(L2CAP_DEFAULT_MAX_PDU_SIZE); - if (L2CAP_DEFAULT_MAX_PDU_SIZE > pi->conn->mtu - 10) - rfc.max_pdu_size = cpu_to_le16(pi->conn->mtu - 10); - - if (!(pi->conn->feat_mask & L2CAP_FEAT_FCS)) - break; - - if (pi->fcs == L2CAP_FCS_NONE || - pi->conf_state & L2CAP_CONF_NO_FCS_RECV) { - pi->fcs = L2CAP_FCS_NONE; - l2cap_add_conf_opt(&ptr, L2CAP_CONF_FCS, 1, pi->fcs); - } - break; - } - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, sizeof(rfc), - (unsigned long) &rfc); - - /* FIXME: Need actual value of the flush timeout */ - //if (flush_to != L2CAP_DEFAULT_FLUSH_TO) - // l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, 2, pi->flush_to); - - req->dcid = cpu_to_le16(pi->dcid); - req->flags = cpu_to_le16(0); - - return ptr - data; -} - -static int l2cap_parse_conf_req(struct sock *sk, void *data) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct l2cap_conf_rsp *rsp = data; - void *ptr = rsp->data; - void *req = pi->conf_req; - int len = pi->conf_len; - int type, hint, olen; - unsigned long val; - struct l2cap_conf_rfc rfc = { .mode = L2CAP_MODE_BASIC }; - u16 mtu = L2CAP_DEFAULT_MTU; - u16 result = L2CAP_CONF_SUCCESS; - - BT_DBG("sk %p", sk); - - while (len >= L2CAP_CONF_OPT_SIZE) { - len -= l2cap_get_conf_opt(&req, &type, &olen, &val); - - hint = type & L2CAP_CONF_HINT; - type &= L2CAP_CONF_MASK; - - switch (type) { - case L2CAP_CONF_MTU: - mtu = val; - break; - - case L2CAP_CONF_FLUSH_TO: - pi->flush_to = val; - break; - - case L2CAP_CONF_QOS: - break; - - case L2CAP_CONF_RFC: - if (olen == sizeof(rfc)) - memcpy(&rfc, (void *) val, olen); - break; - - case L2CAP_CONF_FCS: - if (val == L2CAP_FCS_NONE) - pi->conf_state |= L2CAP_CONF_NO_FCS_RECV; - - break; - - default: - if (hint) - break; - - result = L2CAP_CONF_UNKNOWN; - *((u8 *) ptr++) = type; - break; - } - } - - if (pi->num_conf_rsp || pi->num_conf_req > 1) - goto done; - - switch (pi->mode) { - case L2CAP_MODE_STREAMING: - case L2CAP_MODE_ERTM: - if (!(pi->conf_state & L2CAP_CONF_STATE2_DEVICE)) { - pi->mode = l2cap_select_mode(rfc.mode, - pi->conn->feat_mask); - break; - } - - if (pi->mode != rfc.mode) - return -ECONNREFUSED; - - break; - } - -done: - if (pi->mode != rfc.mode) { - result = L2CAP_CONF_UNACCEPT; - rfc.mode = pi->mode; - - if (pi->num_conf_rsp == 1) - return -ECONNREFUSED; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, - sizeof(rfc), (unsigned long) &rfc); - } - - - if (result == L2CAP_CONF_SUCCESS) { - /* Configure output options and let the other side know - * which ones we don't like. */ - - if (mtu < L2CAP_DEFAULT_MIN_MTU) - result = L2CAP_CONF_UNACCEPT; - else { - pi->omtu = mtu; - pi->conf_state |= L2CAP_CONF_MTU_DONE; - } - l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); - - switch (rfc.mode) { - case L2CAP_MODE_BASIC: - pi->fcs = L2CAP_FCS_NONE; - pi->conf_state |= L2CAP_CONF_MODE_DONE; - break; - - case L2CAP_MODE_ERTM: - pi->remote_tx_win = rfc.txwin_size; - pi->remote_max_tx = rfc.max_transmit; - if (rfc.max_pdu_size > pi->conn->mtu - 10) - rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); - - pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); - - rfc.retrans_timeout = - le16_to_cpu(L2CAP_DEFAULT_RETRANS_TO); - rfc.monitor_timeout = - le16_to_cpu(L2CAP_DEFAULT_MONITOR_TO); - - pi->conf_state |= L2CAP_CONF_MODE_DONE; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, - sizeof(rfc), (unsigned long) &rfc); - - break; - - case L2CAP_MODE_STREAMING: - if (rfc.max_pdu_size > pi->conn->mtu - 10) - rfc.max_pdu_size = le16_to_cpu(pi->conn->mtu - 10); - - pi->remote_mps = le16_to_cpu(rfc.max_pdu_size); - - pi->conf_state |= L2CAP_CONF_MODE_DONE; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, - sizeof(rfc), (unsigned long) &rfc); - - break; - - default: - result = L2CAP_CONF_UNACCEPT; - - memset(&rfc, 0, sizeof(rfc)); - rfc.mode = pi->mode; - } - - if (result == L2CAP_CONF_SUCCESS) - pi->conf_state |= L2CAP_CONF_OUTPUT_DONE; - } - rsp->scid = cpu_to_le16(pi->dcid); - rsp->result = cpu_to_le16(result); - rsp->flags = cpu_to_le16(0x0000); - - return ptr - data; -} - -static int l2cap_parse_conf_rsp(struct sock *sk, void *rsp, int len, void *data, u16 *result) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct l2cap_conf_req *req = data; - void *ptr = req->data; - int type, olen; - unsigned long val; - struct l2cap_conf_rfc rfc; - - BT_DBG("sk %p, rsp %p, len %d, req %p", sk, rsp, len, data); - - while (len >= L2CAP_CONF_OPT_SIZE) { - len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); - - switch (type) { - case L2CAP_CONF_MTU: - if (val < L2CAP_DEFAULT_MIN_MTU) { - *result = L2CAP_CONF_UNACCEPT; - pi->omtu = L2CAP_DEFAULT_MIN_MTU; - } else - pi->omtu = val; - l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu); - break; - - case L2CAP_CONF_FLUSH_TO: - pi->flush_to = val; - l2cap_add_conf_opt(&ptr, L2CAP_CONF_FLUSH_TO, - 2, pi->flush_to); - break; - - case L2CAP_CONF_RFC: - if (olen == sizeof(rfc)) - memcpy(&rfc, (void *)val, olen); - - if ((pi->conf_state & L2CAP_CONF_STATE2_DEVICE) && - rfc.mode != pi->mode) - return -ECONNREFUSED; - - pi->fcs = 0; - - l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC, - sizeof(rfc), (unsigned long) &rfc); - break; - } - } - - if (pi->mode == L2CAP_MODE_BASIC && pi->mode != rfc.mode) - return -ECONNREFUSED; - - pi->mode = rfc.mode; - - if (*result == L2CAP_CONF_SUCCESS) { - switch (rfc.mode) { - case L2CAP_MODE_ERTM: - pi->remote_tx_win = rfc.txwin_size; - pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); - pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); - pi->mps = le16_to_cpu(rfc.max_pdu_size); - break; - case L2CAP_MODE_STREAMING: - pi->mps = le16_to_cpu(rfc.max_pdu_size); - } - } - - req->dcid = cpu_to_le16(pi->dcid); - req->flags = cpu_to_le16(0x0000); - - return ptr - data; -} - -static int l2cap_build_conf_rsp(struct sock *sk, void *data, u16 result, u16 flags) -{ - struct l2cap_conf_rsp *rsp = data; - void *ptr = rsp->data; - - BT_DBG("sk %p", sk); - - rsp->scid = cpu_to_le16(l2cap_pi(sk)->dcid); - rsp->result = cpu_to_le16(result); - rsp->flags = cpu_to_le16(flags); - - return ptr - data; -} - -static void l2cap_conf_rfc_get(struct sock *sk, void *rsp, int len) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - int type, olen; - unsigned long val; - struct l2cap_conf_rfc rfc; - - BT_DBG("sk %p, rsp %p, len %d", sk, rsp, len); - - if ((pi->mode != L2CAP_MODE_ERTM) && (pi->mode != L2CAP_MODE_STREAMING)) - return; - - while (len >= L2CAP_CONF_OPT_SIZE) { - len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val); - - switch (type) { - case L2CAP_CONF_RFC: - if (olen == sizeof(rfc)) - memcpy(&rfc, (void *)val, olen); - goto done; - } - } - -done: - switch (rfc.mode) { - case L2CAP_MODE_ERTM: - pi->remote_tx_win = rfc.txwin_size; - pi->retrans_timeout = le16_to_cpu(rfc.retrans_timeout); - pi->monitor_timeout = le16_to_cpu(rfc.monitor_timeout); - pi->mps = le16_to_cpu(rfc.max_pdu_size); - break; - case L2CAP_MODE_STREAMING: - pi->mps = le16_to_cpu(rfc.max_pdu_size); - } -} - -static inline int l2cap_command_rej(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_cmd_rej *rej = (struct l2cap_cmd_rej *) data; - - if (rej->reason != 0x0000) - return 0; - - if ((conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT) && - cmd->ident == conn->info_ident) { - del_timer(&conn->info_timer); - - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; - conn->info_ident = 0; - - l2cap_conn_start(conn); - } - - return 0; -} - -static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_chan_list *list = &conn->chan_list; - struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; - struct l2cap_conn_rsp rsp; - struct sock *parent, *uninitialized_var(sk); - int result, status = L2CAP_CS_NO_INFO; - - u16 dcid = 0, scid = __le16_to_cpu(req->scid); - __le16 psm = req->psm; - - BT_DBG("psm 0x%2.2x scid 0x%4.4x", psm, scid); - - /* Check if we have socket listening on psm */ - parent = l2cap_get_sock_by_psm(BT_LISTEN, psm, conn->src); - if (!parent) { - result = L2CAP_CR_BAD_PSM; - goto sendresp; - } - - /* Check if the ACL is secure enough (if not SDP) */ - if (psm != cpu_to_le16(0x0001) && - !hci_conn_check_link_mode(conn->hcon)) { - conn->disc_reason = 0x05; - result = L2CAP_CR_SEC_BLOCK; - goto response; - } - - result = L2CAP_CR_NO_MEM; - - /* Check for backlog size */ - if (sk_acceptq_is_full(parent)) { - BT_DBG("backlog full %d", parent->sk_ack_backlog); - goto response; - } - - sk = l2cap_sock_alloc(sock_net(parent), NULL, BTPROTO_L2CAP, GFP_ATOMIC); - if (!sk) - goto response; - - write_lock_bh(&list->lock); - - /* Check if we already have channel with that dcid */ - if (__l2cap_get_chan_by_dcid(list, scid)) { - write_unlock_bh(&list->lock); - sock_set_flag(sk, SOCK_ZAPPED); - l2cap_sock_kill(sk); - goto response; - } - - hci_conn_hold(conn->hcon); - - l2cap_sock_init(sk, parent); - bacpy(&bt_sk(sk)->src, conn->src); - bacpy(&bt_sk(sk)->dst, conn->dst); - l2cap_pi(sk)->psm = psm; - l2cap_pi(sk)->dcid = scid; - - __l2cap_chan_add(conn, sk, parent); - dcid = l2cap_pi(sk)->scid; - - l2cap_sock_set_timer(sk, sk->sk_sndtimeo); - - l2cap_pi(sk)->ident = cmd->ident; - - if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_DONE) { - if (l2cap_check_security(sk)) { - if (bt_sk(sk)->defer_setup) { - sk->sk_state = BT_CONNECT2; - result = L2CAP_CR_PEND; - status = L2CAP_CS_AUTHOR_PEND; - parent->sk_data_ready(parent, 0); - } else { - sk->sk_state = BT_CONFIG; - result = L2CAP_CR_SUCCESS; - status = L2CAP_CS_NO_INFO; - } - } else { - sk->sk_state = BT_CONNECT2; - result = L2CAP_CR_PEND; - status = L2CAP_CS_AUTHEN_PEND; - } - } else { - sk->sk_state = BT_CONNECT2; - result = L2CAP_CR_PEND; - status = L2CAP_CS_NO_INFO; - } - - write_unlock_bh(&list->lock); - -response: - bh_unlock_sock(parent); - -sendresp: - rsp.scid = cpu_to_le16(scid); - rsp.dcid = cpu_to_le16(dcid); - rsp.result = cpu_to_le16(result); - rsp.status = cpu_to_le16(status); - l2cap_send_cmd(conn, cmd->ident, L2CAP_CONN_RSP, sizeof(rsp), &rsp); - - if (result == L2CAP_CR_PEND && status == L2CAP_CS_NO_INFO) { - struct l2cap_info_req info; - info.type = cpu_to_le16(L2CAP_IT_FEAT_MASK); - - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_SENT; - conn->info_ident = l2cap_get_ident(conn); - - mod_timer(&conn->info_timer, jiffies + - msecs_to_jiffies(L2CAP_INFO_TIMEOUT)); - - l2cap_send_cmd(conn, conn->info_ident, - L2CAP_INFO_REQ, sizeof(info), &info); - } - - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) && - result == L2CAP_CR_SUCCESS) { - u8 buf[128]; - l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(sk, buf), buf); - l2cap_pi(sk)->num_conf_req++; - } - - return 0; -} - -static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_conn_rsp *rsp = (struct l2cap_conn_rsp *) data; - u16 scid, dcid, result, status; - struct sock *sk; - u8 req[128]; - - scid = __le16_to_cpu(rsp->scid); - dcid = __le16_to_cpu(rsp->dcid); - result = __le16_to_cpu(rsp->result); - status = __le16_to_cpu(rsp->status); - - BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x", dcid, scid, result, status); - - if (scid) { - sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); - if (!sk) - return -EFAULT; - } else { - sk = l2cap_get_chan_by_ident(&conn->chan_list, cmd->ident); - if (!sk) - return -EFAULT; - } - - switch (result) { - case L2CAP_CR_SUCCESS: - sk->sk_state = BT_CONFIG; - l2cap_pi(sk)->ident = 0; - l2cap_pi(sk)->dcid = dcid; - l2cap_pi(sk)->conf_state &= ~L2CAP_CONF_CONNECT_PEND; - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT) - break; - - l2cap_pi(sk)->conf_state |= L2CAP_CONF_REQ_SENT; - - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(sk, req), req); - l2cap_pi(sk)->num_conf_req++; - break; - - case L2CAP_CR_PEND: - l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; - break; - - default: - l2cap_chan_del(sk, ECONNREFUSED); - break; - } - - bh_unlock_sock(sk); - return 0; -} - -static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u16 cmd_len, u8 *data) -{ - struct l2cap_conf_req *req = (struct l2cap_conf_req *) data; - u16 dcid, flags; - u8 rsp[64]; - struct sock *sk; - int len; - - dcid = __le16_to_cpu(req->dcid); - flags = __le16_to_cpu(req->flags); - - BT_DBG("dcid 0x%4.4x flags 0x%2.2x", dcid, flags); - - sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); - if (!sk) - return -ENOENT; - - if (sk->sk_state != BT_CONFIG) { - struct l2cap_cmd_rej rej; - - rej.reason = cpu_to_le16(0x0002); - l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ, - sizeof(rej), &rej); - goto unlock; - } - - /* Reject if config buffer is too small. */ - len = cmd_len - sizeof(*req); - if (l2cap_pi(sk)->conf_len + len > sizeof(l2cap_pi(sk)->conf_req)) { - l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, - l2cap_build_conf_rsp(sk, rsp, - L2CAP_CONF_REJECT, flags), rsp); - goto unlock; - } - - /* Store config. */ - memcpy(l2cap_pi(sk)->conf_req + l2cap_pi(sk)->conf_len, req->data, len); - l2cap_pi(sk)->conf_len += len; - - if (flags & 0x0001) { - /* Incomplete config. Send empty response. */ - l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, - l2cap_build_conf_rsp(sk, rsp, - L2CAP_CONF_SUCCESS, 0x0001), rsp); - goto unlock; - } - - /* Complete config. */ - len = l2cap_parse_conf_req(sk, rsp); - if (len < 0) { - l2cap_send_disconn_req(conn, sk, ECONNRESET); - goto unlock; - } - - l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp); - l2cap_pi(sk)->num_conf_rsp++; - - /* Reset config buffer. */ - l2cap_pi(sk)->conf_len = 0; - - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE)) - goto unlock; - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) { - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || - l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) - l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; - - sk->sk_state = BT_CONNECTED; - - l2cap_pi(sk)->next_tx_seq = 0; - l2cap_pi(sk)->expected_tx_seq = 0; - __skb_queue_head_init(TX_QUEUE(sk)); - if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) - l2cap_ertm_init(sk); - - l2cap_chan_ready(sk); - goto unlock; - } - - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) { - u8 buf[64]; - l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ, - l2cap_build_conf_req(sk, buf), buf); - l2cap_pi(sk)->num_conf_req++; - } - -unlock: - bh_unlock_sock(sk); - return 0; -} - -static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_conf_rsp *rsp = (struct l2cap_conf_rsp *)data; - u16 scid, flags, result; - struct sock *sk; - int len = cmd->len - sizeof(*rsp); - - scid = __le16_to_cpu(rsp->scid); - flags = __le16_to_cpu(rsp->flags); - result = __le16_to_cpu(rsp->result); - - BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x", - scid, flags, result); - - sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); - if (!sk) - return 0; - - switch (result) { - case L2CAP_CONF_SUCCESS: - l2cap_conf_rfc_get(sk, rsp->data, len); - break; - - case L2CAP_CONF_UNACCEPT: - if (l2cap_pi(sk)->num_conf_rsp <= L2CAP_CONF_MAX_CONF_RSP) { - char req[64]; - - if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) { - l2cap_send_disconn_req(conn, sk, ECONNRESET); - goto done; - } - - /* throw out any old stored conf requests */ - result = L2CAP_CONF_SUCCESS; - len = l2cap_parse_conf_rsp(sk, rsp->data, - len, req, &result); - if (len < 0) { - l2cap_send_disconn_req(conn, sk, ECONNRESET); - goto done; - } - - l2cap_send_cmd(conn, l2cap_get_ident(conn), - L2CAP_CONF_REQ, len, req); - l2cap_pi(sk)->num_conf_req++; - if (result != L2CAP_CONF_SUCCESS) - goto done; - break; - } - - default: - sk->sk_err = ECONNRESET; - l2cap_sock_set_timer(sk, HZ * 5); - l2cap_send_disconn_req(conn, sk, ECONNRESET); - goto done; - } - - if (flags & 0x01) - goto done; - - l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE; - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) { - if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_NO_FCS_RECV) || - l2cap_pi(sk)->fcs != L2CAP_FCS_NONE) - l2cap_pi(sk)->fcs = L2CAP_FCS_CRC16; - - sk->sk_state = BT_CONNECTED; - l2cap_pi(sk)->next_tx_seq = 0; - l2cap_pi(sk)->expected_tx_seq = 0; - __skb_queue_head_init(TX_QUEUE(sk)); - if (l2cap_pi(sk)->mode == L2CAP_MODE_ERTM) - l2cap_ertm_init(sk); - - l2cap_chan_ready(sk); - } - -done: - bh_unlock_sock(sk); - return 0; -} - -static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_disconn_req *req = (struct l2cap_disconn_req *) data; - struct l2cap_disconn_rsp rsp; - u16 dcid, scid; - struct sock *sk; - - scid = __le16_to_cpu(req->scid); - dcid = __le16_to_cpu(req->dcid); - - BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid); - - sk = l2cap_get_chan_by_scid(&conn->chan_list, dcid); - if (!sk) - return 0; - - rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); - rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); - l2cap_send_cmd(conn, cmd->ident, L2CAP_DISCONN_RSP, sizeof(rsp), &rsp); - - sk->sk_shutdown = SHUTDOWN_MASK; - - l2cap_chan_del(sk, ECONNRESET); - bh_unlock_sock(sk); - - l2cap_sock_kill(sk); - return 0; -} - -static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_disconn_rsp *rsp = (struct l2cap_disconn_rsp *) data; - u16 dcid, scid; - struct sock *sk; - - scid = __le16_to_cpu(rsp->scid); - dcid = __le16_to_cpu(rsp->dcid); - - BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid); - - sk = l2cap_get_chan_by_scid(&conn->chan_list, scid); - if (!sk) - return 0; - - l2cap_chan_del(sk, 0); - bh_unlock_sock(sk); - - l2cap_sock_kill(sk); - return 0; -} - -static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_info_req *req = (struct l2cap_info_req *) data; - u16 type; - - type = __le16_to_cpu(req->type); - - BT_DBG("type 0x%4.4x", type); - - if (type == L2CAP_IT_FEAT_MASK) { - u8 buf[8]; - u32 feat_mask = l2cap_feat_mask; - struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; - rsp->type = cpu_to_le16(L2CAP_IT_FEAT_MASK); - rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); - if (enable_ertm) - feat_mask |= L2CAP_FEAT_ERTM | L2CAP_FEAT_STREAMING - | L2CAP_FEAT_FCS; - put_unaligned_le32(feat_mask, rsp->data); - l2cap_send_cmd(conn, cmd->ident, - L2CAP_INFO_RSP, sizeof(buf), buf); - } else if (type == L2CAP_IT_FIXED_CHAN) { - u8 buf[12]; - struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf; - rsp->type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); - rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS); - memcpy(buf + 4, l2cap_fixed_chan, 8); - l2cap_send_cmd(conn, cmd->ident, - L2CAP_INFO_RSP, sizeof(buf), buf); - } else { - struct l2cap_info_rsp rsp; - rsp.type = cpu_to_le16(type); - rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP); - l2cap_send_cmd(conn, cmd->ident, - L2CAP_INFO_RSP, sizeof(rsp), &rsp); - } - - return 0; -} - -static inline int l2cap_information_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data) -{ - struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) data; - u16 type, result; - - type = __le16_to_cpu(rsp->type); - result = __le16_to_cpu(rsp->result); - - BT_DBG("type 0x%4.4x result 0x%2.2x", type, result); - - del_timer(&conn->info_timer); - - if (type == L2CAP_IT_FEAT_MASK) { - conn->feat_mask = get_unaligned_le32(rsp->data); - - if (conn->feat_mask & L2CAP_FEAT_FIXED_CHAN) { - struct l2cap_info_req req; - req.type = cpu_to_le16(L2CAP_IT_FIXED_CHAN); - - conn->info_ident = l2cap_get_ident(conn); - - l2cap_send_cmd(conn, conn->info_ident, - L2CAP_INFO_REQ, sizeof(req), &req); - } else { - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; - conn->info_ident = 0; - - l2cap_conn_start(conn); - } - } else if (type == L2CAP_IT_FIXED_CHAN) { - conn->info_state |= L2CAP_INFO_FEAT_MASK_REQ_DONE; - conn->info_ident = 0; - - l2cap_conn_start(conn); - } - - return 0; -} - -static inline void l2cap_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb) -{ - u8 *data = skb->data; - int len = skb->len; - struct l2cap_cmd_hdr cmd; - int err = 0; - - l2cap_raw_recv(conn, skb); - - while (len >= L2CAP_CMD_HDR_SIZE) { - u16 cmd_len; - memcpy(&cmd, data, L2CAP_CMD_HDR_SIZE); - data += L2CAP_CMD_HDR_SIZE; - len -= L2CAP_CMD_HDR_SIZE; - - cmd_len = le16_to_cpu(cmd.len); - - BT_DBG("code 0x%2.2x len %d id 0x%2.2x", cmd.code, cmd_len, cmd.ident); - - if (cmd_len > len || !cmd.ident) { - BT_DBG("corrupted command"); - break; - } - - switch (cmd.code) { - case L2CAP_COMMAND_REJ: - l2cap_command_rej(conn, &cmd, data); - break; - - case L2CAP_CONN_REQ: - err = l2cap_connect_req(conn, &cmd, data); - break; - - case L2CAP_CONN_RSP: - err = l2cap_connect_rsp(conn, &cmd, data); - break; - - case L2CAP_CONF_REQ: - err = l2cap_config_req(conn, &cmd, cmd_len, data); - break; - - case L2CAP_CONF_RSP: - err = l2cap_config_rsp(conn, &cmd, data); - break; - - case L2CAP_DISCONN_REQ: - err = l2cap_disconnect_req(conn, &cmd, data); - break; - - case L2CAP_DISCONN_RSP: - err = l2cap_disconnect_rsp(conn, &cmd, data); - break; - - case L2CAP_ECHO_REQ: - l2cap_send_cmd(conn, cmd.ident, L2CAP_ECHO_RSP, cmd_len, data); - break; - - case L2CAP_ECHO_RSP: - break; - - case L2CAP_INFO_REQ: - err = l2cap_information_req(conn, &cmd, data); - break; - - case L2CAP_INFO_RSP: - err = l2cap_information_rsp(conn, &cmd, data); - break; - - default: - BT_ERR("Unknown signaling command 0x%2.2x", cmd.code); - err = -EINVAL; - break; - } - - if (err) { - struct l2cap_cmd_rej rej; - BT_DBG("error %d", err); - - /* FIXME: Map err to a valid reason */ - rej.reason = cpu_to_le16(0); - l2cap_send_cmd(conn, cmd.ident, L2CAP_COMMAND_REJ, sizeof(rej), &rej); - } - - data += cmd_len; - len -= cmd_len; - } - - kfree_skb(skb); -} - -static int l2cap_check_fcs(struct l2cap_pinfo *pi, struct sk_buff *skb) -{ - u16 our_fcs, rcv_fcs; - int hdr_size = L2CAP_HDR_SIZE + 2; - - if (pi->fcs == L2CAP_FCS_CRC16) { - skb_trim(skb, skb->len - 2); - rcv_fcs = get_unaligned_le16(skb->data + skb->len); - our_fcs = crc16(0, skb->data - hdr_size, skb->len + hdr_size); - - if (our_fcs != rcv_fcs) - return -EBADMSG; - } - return 0; -} - -static inline void l2cap_send_i_or_rr_or_rnr(struct sock *sk) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u16 control = 0; - - pi->frames_sent = 0; - - control |= pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; - - if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { - control |= L2CAP_SUPER_RCV_NOT_READY; - l2cap_send_sframe(pi, control); - pi->conn_state |= L2CAP_CONN_RNR_SENT; - } - - if (pi->conn_state & L2CAP_CONN_REMOTE_BUSY) - l2cap_retransmit_frames(sk); - - l2cap_ertm_send(sk); - - if (!(pi->conn_state & L2CAP_CONN_LOCAL_BUSY) && - pi->frames_sent == 0) { - control |= L2CAP_SUPER_RCV_READY; - l2cap_send_sframe(pi, control); - } -} - -static int l2cap_add_to_srej_queue(struct sock *sk, struct sk_buff *skb, u8 tx_seq, u8 sar) -{ - struct sk_buff *next_skb; - struct l2cap_pinfo *pi = l2cap_pi(sk); - int tx_seq_offset, next_tx_seq_offset; - - bt_cb(skb)->tx_seq = tx_seq; - bt_cb(skb)->sar = sar; - - next_skb = skb_peek(SREJ_QUEUE(sk)); - if (!next_skb) { - __skb_queue_tail(SREJ_QUEUE(sk), skb); - return 0; - } - - tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; - if (tx_seq_offset < 0) - tx_seq_offset += 64; - - do { - if (bt_cb(next_skb)->tx_seq == tx_seq) - return -EINVAL; - - next_tx_seq_offset = (bt_cb(next_skb)->tx_seq - - pi->buffer_seq) % 64; - if (next_tx_seq_offset < 0) - next_tx_seq_offset += 64; - - if (next_tx_seq_offset > tx_seq_offset) { - __skb_queue_before(SREJ_QUEUE(sk), next_skb, skb); - return 0; - } - - if (skb_queue_is_last(SREJ_QUEUE(sk), next_skb)) - break; - - } while ((next_skb = skb_queue_next(SREJ_QUEUE(sk), next_skb))); - - __skb_queue_tail(SREJ_QUEUE(sk), skb); - - return 0; -} - -static int l2cap_ertm_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *_skb; - int err; - - switch (control & L2CAP_CTRL_SAR) { - case L2CAP_SDU_UNSEGMENTED: - if (pi->conn_state & L2CAP_CONN_SAR_SDU) - goto drop; - - err = sock_queue_rcv_skb(sk, skb); - if (!err) - return err; - - break; - - case L2CAP_SDU_START: - if (pi->conn_state & L2CAP_CONN_SAR_SDU) - goto drop; - - pi->sdu_len = get_unaligned_le16(skb->data); - - if (pi->sdu_len > pi->imtu) - goto disconnect; - - pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); - if (!pi->sdu) - return -ENOMEM; - - /* pull sdu_len bytes only after alloc, because of Local Busy - * condition we have to be sure that this will be executed - * only once, i.e., when alloc does not fail */ - skb_pull(skb, 2); - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - - pi->conn_state |= L2CAP_CONN_SAR_SDU; - pi->partial_sdu_len = skb->len; - break; - - case L2CAP_SDU_CONTINUE: - if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) - goto disconnect; - - if (!pi->sdu) - goto disconnect; - - pi->partial_sdu_len += skb->len; - if (pi->partial_sdu_len > pi->sdu_len) - goto drop; - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - - break; - - case L2CAP_SDU_END: - if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) - goto disconnect; - - if (!pi->sdu) - goto disconnect; - - if (!(pi->conn_state & L2CAP_CONN_SAR_RETRY)) { - pi->partial_sdu_len += skb->len; - - if (pi->partial_sdu_len > pi->imtu) - goto drop; - - if (pi->partial_sdu_len != pi->sdu_len) - goto drop; - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - } - - _skb = skb_clone(pi->sdu, GFP_ATOMIC); - if (!_skb) { - pi->conn_state |= L2CAP_CONN_SAR_RETRY; - return -ENOMEM; - } - - err = sock_queue_rcv_skb(sk, _skb); - if (err < 0) { - kfree_skb(_skb); - pi->conn_state |= L2CAP_CONN_SAR_RETRY; - return err; - } - - pi->conn_state &= ~L2CAP_CONN_SAR_RETRY; - pi->conn_state &= ~L2CAP_CONN_SAR_SDU; - - kfree_skb(pi->sdu); - break; - } - - kfree_skb(skb); - return 0; - -drop: - kfree_skb(pi->sdu); - pi->sdu = NULL; - -disconnect: - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - kfree_skb(skb); - return 0; -} - -static int l2cap_try_push_rx_skb(struct sock *sk) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *skb; - u16 control; - int err; - - while ((skb = skb_dequeue(BUSY_QUEUE(sk)))) { - control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; - err = l2cap_ertm_reassembly_sdu(sk, skb, control); - if (err < 0) { - skb_queue_head(BUSY_QUEUE(sk), skb); - return -EBUSY; - } - - pi->buffer_seq = (pi->buffer_seq + 1) % 64; - } - - if (!(pi->conn_state & L2CAP_CONN_RNR_SENT)) - goto done; - - control = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; - control |= L2CAP_SUPER_RCV_READY | L2CAP_CTRL_POLL; - l2cap_send_sframe(pi, control); - l2cap_pi(sk)->retry_count = 1; - - del_timer(&pi->retrans_timer); - __mod_monitor_timer(); - - l2cap_pi(sk)->conn_state |= L2CAP_CONN_WAIT_F; - -done: - pi->conn_state &= ~L2CAP_CONN_LOCAL_BUSY; - pi->conn_state &= ~L2CAP_CONN_RNR_SENT; - - BT_DBG("sk %p, Exit local busy", sk); - - return 0; -} - -static void l2cap_busy_work(struct work_struct *work) -{ - DECLARE_WAITQUEUE(wait, current); - struct l2cap_pinfo *pi = - container_of(work, struct l2cap_pinfo, busy_work); - struct sock *sk = (struct sock *)pi; - int n_tries = 0, timeo = HZ/5, err; - struct sk_buff *skb; - - lock_sock(sk); - - add_wait_queue(sk_sleep(sk), &wait); - while ((skb = skb_peek(BUSY_QUEUE(sk)))) { - set_current_state(TASK_INTERRUPTIBLE); - - if (n_tries++ > L2CAP_LOCAL_BUSY_TRIES) { - err = -EBUSY; - l2cap_send_disconn_req(pi->conn, sk, EBUSY); - break; - } - - if (!timeo) - timeo = HZ/5; - - if (signal_pending(current)) { - err = sock_intr_errno(timeo); - break; - } - - release_sock(sk); - timeo = schedule_timeout(timeo); - lock_sock(sk); - - err = sock_error(sk); - if (err) - break; - - if (l2cap_try_push_rx_skb(sk) == 0) - break; - } - - set_current_state(TASK_RUNNING); - remove_wait_queue(sk_sleep(sk), &wait); - - release_sock(sk); -} - -static int l2cap_push_rx_skb(struct sock *sk, struct sk_buff *skb, u16 control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - int sctrl, err; - - if (pi->conn_state & L2CAP_CONN_LOCAL_BUSY) { - bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; - __skb_queue_tail(BUSY_QUEUE(sk), skb); - return l2cap_try_push_rx_skb(sk); - - - } - - err = l2cap_ertm_reassembly_sdu(sk, skb, control); - if (err >= 0) { - pi->buffer_seq = (pi->buffer_seq + 1) % 64; - return err; - } - - /* Busy Condition */ - BT_DBG("sk %p, Enter local busy", sk); - - pi->conn_state |= L2CAP_CONN_LOCAL_BUSY; - bt_cb(skb)->sar = control >> L2CAP_CTRL_SAR_SHIFT; - __skb_queue_tail(BUSY_QUEUE(sk), skb); - - sctrl = pi->buffer_seq << L2CAP_CTRL_REQSEQ_SHIFT; - sctrl |= L2CAP_SUPER_RCV_NOT_READY; - l2cap_send_sframe(pi, sctrl); - - pi->conn_state |= L2CAP_CONN_RNR_SENT; - - del_timer(&pi->ack_timer); - - queue_work(_busy_wq, &pi->busy_work); - - return err; -} - -static int l2cap_streaming_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct sk_buff *_skb; - int err = -EINVAL; - - /* - * TODO: We have to notify the userland if some data is lost with the - * Streaming Mode. - */ - - switch (control & L2CAP_CTRL_SAR) { - case L2CAP_SDU_UNSEGMENTED: - if (pi->conn_state & L2CAP_CONN_SAR_SDU) { - kfree_skb(pi->sdu); - break; - } - - err = sock_queue_rcv_skb(sk, skb); - if (!err) - return 0; - - break; - - case L2CAP_SDU_START: - if (pi->conn_state & L2CAP_CONN_SAR_SDU) { - kfree_skb(pi->sdu); - break; - } - - pi->sdu_len = get_unaligned_le16(skb->data); - skb_pull(skb, 2); - - if (pi->sdu_len > pi->imtu) { - err = -EMSGSIZE; - break; - } - - pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC); - if (!pi->sdu) { - err = -ENOMEM; - break; - } - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - - pi->conn_state |= L2CAP_CONN_SAR_SDU; - pi->partial_sdu_len = skb->len; - err = 0; - break; - - case L2CAP_SDU_CONTINUE: - if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) - break; - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - - pi->partial_sdu_len += skb->len; - if (pi->partial_sdu_len > pi->sdu_len) - kfree_skb(pi->sdu); - else - err = 0; - - break; - - case L2CAP_SDU_END: - if (!(pi->conn_state & L2CAP_CONN_SAR_SDU)) - break; - - memcpy(skb_put(pi->sdu, skb->len), skb->data, skb->len); - - pi->conn_state &= ~L2CAP_CONN_SAR_SDU; - pi->partial_sdu_len += skb->len; - - if (pi->partial_sdu_len > pi->imtu) - goto drop; - - if (pi->partial_sdu_len == pi->sdu_len) { - _skb = skb_clone(pi->sdu, GFP_ATOMIC); - err = sock_queue_rcv_skb(sk, _skb); - if (err < 0) - kfree_skb(_skb); - } - err = 0; - -drop: - kfree_skb(pi->sdu); - break; - } - - kfree_skb(skb); - return err; -} - -static void l2cap_check_srej_gap(struct sock *sk, u8 tx_seq) -{ - struct sk_buff *skb; - u16 control; - - while ((skb = skb_peek(SREJ_QUEUE(sk)))) { - if (bt_cb(skb)->tx_seq != tx_seq) - break; - - skb = skb_dequeue(SREJ_QUEUE(sk)); - control = bt_cb(skb)->sar << L2CAP_CTRL_SAR_SHIFT; - l2cap_ertm_reassembly_sdu(sk, skb, control); - l2cap_pi(sk)->buffer_seq_srej = - (l2cap_pi(sk)->buffer_seq_srej + 1) % 64; - tx_seq = (tx_seq + 1) % 64; - } -} - -static void l2cap_resend_srejframe(struct sock *sk, u8 tx_seq) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct srej_list *l, *tmp; - u16 control; - - list_for_each_entry_safe(l, tmp, SREJ_LIST(sk), list) { - if (l->tx_seq == tx_seq) { - list_del(&l->list); - kfree(l); - return; - } - control = L2CAP_SUPER_SELECT_REJECT; - control |= l->tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; - l2cap_send_sframe(pi, control); - list_del(&l->list); - list_add_tail(&l->list, SREJ_LIST(sk)); - } -} - -static void l2cap_send_srejframe(struct sock *sk, u8 tx_seq) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - struct srej_list *new; - u16 control; - - while (tx_seq != pi->expected_tx_seq) { - control = L2CAP_SUPER_SELECT_REJECT; - control |= pi->expected_tx_seq << L2CAP_CTRL_REQSEQ_SHIFT; - l2cap_send_sframe(pi, control); - - new = kzalloc(sizeof(struct srej_list), GFP_ATOMIC); - new->tx_seq = pi->expected_tx_seq; - pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; - list_add_tail(&new->list, SREJ_LIST(sk)); - } - pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; -} - -static inline int l2cap_data_channel_iframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u8 tx_seq = __get_txseq(rx_control); - u8 req_seq = __get_reqseq(rx_control); - u8 sar = rx_control >> L2CAP_CTRL_SAR_SHIFT; - int tx_seq_offset, expected_tx_seq_offset; - int num_to_ack = (pi->tx_win/6) + 1; - int err = 0; - - BT_DBG("sk %p len %d tx_seq %d rx_control 0x%4.4x", sk, skb->len, tx_seq, - rx_control); - - if (L2CAP_CTRL_FINAL & rx_control && - l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { - del_timer(&pi->monitor_timer); - if (pi->unacked_frames > 0) - __mod_retrans_timer(); - pi->conn_state &= ~L2CAP_CONN_WAIT_F; - } - - pi->expected_ack_seq = req_seq; - l2cap_drop_acked_frames(sk); - - if (tx_seq == pi->expected_tx_seq) - goto expected; - - tx_seq_offset = (tx_seq - pi->buffer_seq) % 64; - if (tx_seq_offset < 0) - tx_seq_offset += 64; - - /* invalid tx_seq */ - if (tx_seq_offset >= pi->tx_win) { - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - goto drop; - } - - if (pi->conn_state == L2CAP_CONN_LOCAL_BUSY) - goto drop; - - if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { - struct srej_list *first; - - first = list_first_entry(SREJ_LIST(sk), - struct srej_list, list); - if (tx_seq == first->tx_seq) { - l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); - l2cap_check_srej_gap(sk, tx_seq); - - list_del(&first->list); - kfree(first); - - if (list_empty(SREJ_LIST(sk))) { - pi->buffer_seq = pi->buffer_seq_srej; - pi->conn_state &= ~L2CAP_CONN_SREJ_SENT; - l2cap_send_ack(pi); - BT_DBG("sk %p, Exit SREJ_SENT", sk); - } - } else { - struct srej_list *l; - - /* duplicated tx_seq */ - if (l2cap_add_to_srej_queue(sk, skb, tx_seq, sar) < 0) - goto drop; - - list_for_each_entry(l, SREJ_LIST(sk), list) { - if (l->tx_seq == tx_seq) { - l2cap_resend_srejframe(sk, tx_seq); - return 0; - } - } - l2cap_send_srejframe(sk, tx_seq); - } - } else { - expected_tx_seq_offset = - (pi->expected_tx_seq - pi->buffer_seq) % 64; - if (expected_tx_seq_offset < 0) - expected_tx_seq_offset += 64; - - /* duplicated tx_seq */ - if (tx_seq_offset < expected_tx_seq_offset) - goto drop; - - pi->conn_state |= L2CAP_CONN_SREJ_SENT; - - BT_DBG("sk %p, Enter SREJ", sk); - - INIT_LIST_HEAD(SREJ_LIST(sk)); - pi->buffer_seq_srej = pi->buffer_seq; - - __skb_queue_head_init(SREJ_QUEUE(sk)); - __skb_queue_head_init(BUSY_QUEUE(sk)); - l2cap_add_to_srej_queue(sk, skb, tx_seq, sar); - - pi->conn_state |= L2CAP_CONN_SEND_PBIT; - - l2cap_send_srejframe(sk, tx_seq); - - del_timer(&pi->ack_timer); - } - return 0; - -expected: - pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; - - if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { - bt_cb(skb)->tx_seq = tx_seq; - bt_cb(skb)->sar = sar; - __skb_queue_tail(SREJ_QUEUE(sk), skb); - return 0; - } - - err = l2cap_push_rx_skb(sk, skb, rx_control); - if (err < 0) - return 0; - - if (rx_control & L2CAP_CTRL_FINAL) { - if (pi->conn_state & L2CAP_CONN_REJ_ACT) - pi->conn_state &= ~L2CAP_CONN_REJ_ACT; - else - l2cap_retransmit_frames(sk); - } - - __mod_ack_timer(); - - pi->num_acked = (pi->num_acked + 1) % num_to_ack; - if (pi->num_acked == num_to_ack - 1) - l2cap_send_ack(pi); - - return 0; - -drop: - kfree_skb(skb); - return 0; -} - -static inline void l2cap_data_channel_rrframe(struct sock *sk, u16 rx_control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - - BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, __get_reqseq(rx_control), - rx_control); - - pi->expected_ack_seq = __get_reqseq(rx_control); - l2cap_drop_acked_frames(sk); - - if (rx_control & L2CAP_CTRL_POLL) { - pi->conn_state |= L2CAP_CONN_SEND_FBIT; - if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { - if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && - (pi->unacked_frames > 0)) - __mod_retrans_timer(); - - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - l2cap_send_srejtail(sk); - } else { - l2cap_send_i_or_rr_or_rnr(sk); - } - - } else if (rx_control & L2CAP_CTRL_FINAL) { - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - - if (pi->conn_state & L2CAP_CONN_REJ_ACT) - pi->conn_state &= ~L2CAP_CONN_REJ_ACT; - else - l2cap_retransmit_frames(sk); - - } else { - if ((pi->conn_state & L2CAP_CONN_REMOTE_BUSY) && - (pi->unacked_frames > 0)) - __mod_retrans_timer(); - - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - if (pi->conn_state & L2CAP_CONN_SREJ_SENT) { - l2cap_send_ack(pi); - } else { - l2cap_ertm_send(sk); - } - } -} - -static inline void l2cap_data_channel_rejframe(struct sock *sk, u16 rx_control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u8 tx_seq = __get_reqseq(rx_control); - - BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); - - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - - pi->expected_ack_seq = tx_seq; - l2cap_drop_acked_frames(sk); - - if (rx_control & L2CAP_CTRL_FINAL) { - if (pi->conn_state & L2CAP_CONN_REJ_ACT) - pi->conn_state &= ~L2CAP_CONN_REJ_ACT; - else - l2cap_retransmit_frames(sk); - } else { - l2cap_retransmit_frames(sk); - - if (pi->conn_state & L2CAP_CONN_WAIT_F) - pi->conn_state |= L2CAP_CONN_REJ_ACT; - } -} -static inline void l2cap_data_channel_srejframe(struct sock *sk, u16 rx_control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u8 tx_seq = __get_reqseq(rx_control); - - BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); - - pi->conn_state &= ~L2CAP_CONN_REMOTE_BUSY; - - if (rx_control & L2CAP_CTRL_POLL) { - pi->expected_ack_seq = tx_seq; - l2cap_drop_acked_frames(sk); - - pi->conn_state |= L2CAP_CONN_SEND_FBIT; - l2cap_retransmit_one_frame(sk, tx_seq); - - l2cap_ertm_send(sk); - - if (pi->conn_state & L2CAP_CONN_WAIT_F) { - pi->srej_save_reqseq = tx_seq; - pi->conn_state |= L2CAP_CONN_SREJ_ACT; - } - } else if (rx_control & L2CAP_CTRL_FINAL) { - if ((pi->conn_state & L2CAP_CONN_SREJ_ACT) && - pi->srej_save_reqseq == tx_seq) - pi->conn_state &= ~L2CAP_CONN_SREJ_ACT; - else - l2cap_retransmit_one_frame(sk, tx_seq); - } else { - l2cap_retransmit_one_frame(sk, tx_seq); - if (pi->conn_state & L2CAP_CONN_WAIT_F) { - pi->srej_save_reqseq = tx_seq; - pi->conn_state |= L2CAP_CONN_SREJ_ACT; - } - } -} - -static inline void l2cap_data_channel_rnrframe(struct sock *sk, u16 rx_control) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u8 tx_seq = __get_reqseq(rx_control); - - BT_DBG("sk %p, req_seq %d ctrl 0x%4.4x", sk, tx_seq, rx_control); - - pi->conn_state |= L2CAP_CONN_REMOTE_BUSY; - pi->expected_ack_seq = tx_seq; - l2cap_drop_acked_frames(sk); - - if (rx_control & L2CAP_CTRL_POLL) - pi->conn_state |= L2CAP_CONN_SEND_FBIT; - - if (!(pi->conn_state & L2CAP_CONN_SREJ_SENT)) { - del_timer(&pi->retrans_timer); - if (rx_control & L2CAP_CTRL_POLL) - l2cap_send_rr_or_rnr(pi, L2CAP_CTRL_FINAL); - return; - } - - if (rx_control & L2CAP_CTRL_POLL) - l2cap_send_srejtail(sk); - else - l2cap_send_sframe(pi, L2CAP_SUPER_RCV_READY); -} - -static inline int l2cap_data_channel_sframe(struct sock *sk, u16 rx_control, struct sk_buff *skb) -{ - BT_DBG("sk %p rx_control 0x%4.4x len %d", sk, rx_control, skb->len); - - if (L2CAP_CTRL_FINAL & rx_control && - l2cap_pi(sk)->conn_state & L2CAP_CONN_WAIT_F) { - del_timer(&l2cap_pi(sk)->monitor_timer); - if (l2cap_pi(sk)->unacked_frames > 0) - __mod_retrans_timer(); - l2cap_pi(sk)->conn_state &= ~L2CAP_CONN_WAIT_F; - } - - switch (rx_control & L2CAP_CTRL_SUPERVISE) { - case L2CAP_SUPER_RCV_READY: - l2cap_data_channel_rrframe(sk, rx_control); - break; - - case L2CAP_SUPER_REJECT: - l2cap_data_channel_rejframe(sk, rx_control); - break; - - case L2CAP_SUPER_SELECT_REJECT: - l2cap_data_channel_srejframe(sk, rx_control); - break; - - case L2CAP_SUPER_RCV_NOT_READY: - l2cap_data_channel_rnrframe(sk, rx_control); - break; - } - - kfree_skb(skb); - return 0; -} - -static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - u16 control; - u8 req_seq; - int len, next_tx_seq_offset, req_seq_offset; - - control = get_unaligned_le16(skb->data); - skb_pull(skb, 2); - len = skb->len; - - /* - * We can just drop the corrupted I-frame here. - * Receiver will miss it and start proper recovery - * procedures and ask retransmission. - */ - if (l2cap_check_fcs(pi, skb)) - goto drop; - - if (__is_sar_start(control) && __is_iframe(control)) - len -= 2; - - if (pi->fcs == L2CAP_FCS_CRC16) - len -= 2; - - if (len > pi->mps) { - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - goto drop; - } - - req_seq = __get_reqseq(control); - req_seq_offset = (req_seq - pi->expected_ack_seq) % 64; - if (req_seq_offset < 0) - req_seq_offset += 64; - - next_tx_seq_offset = - (pi->next_tx_seq - pi->expected_ack_seq) % 64; - if (next_tx_seq_offset < 0) - next_tx_seq_offset += 64; - - /* check for invalid req-seq */ - if (req_seq_offset > next_tx_seq_offset) { - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - goto drop; - } - - if (__is_iframe(control)) { - if (len < 0) { - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - goto drop; - } - - l2cap_data_channel_iframe(sk, control, skb); - } else { - if (len != 0) { - BT_ERR("%d", len); - l2cap_send_disconn_req(pi->conn, sk, ECONNRESET); - goto drop; - } - - l2cap_data_channel_sframe(sk, control, skb); - } - - return 0; - -drop: - kfree_skb(skb); - return 0; -} - -static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk_buff *skb) -{ - struct sock *sk; - struct l2cap_pinfo *pi; - u16 control; - u8 tx_seq; - int len; - - sk = l2cap_get_chan_by_scid(&conn->chan_list, cid); - if (!sk) { - BT_DBG("unknown cid 0x%4.4x", cid); - goto drop; - } - - pi = l2cap_pi(sk); - - BT_DBG("sk %p, len %d", sk, skb->len); - - if (sk->sk_state != BT_CONNECTED) - goto drop; - - switch (pi->mode) { - case L2CAP_MODE_BASIC: - /* If socket recv buffers overflows we drop data here - * which is *bad* because L2CAP has to be reliable. - * But we don't have any other choice. L2CAP doesn't - * provide flow control mechanism. */ - - if (pi->imtu < skb->len) - goto drop; - - if (!sock_queue_rcv_skb(sk, skb)) - goto done; - break; - - case L2CAP_MODE_ERTM: - if (!sock_owned_by_user(sk)) { - l2cap_ertm_data_rcv(sk, skb); - } else { - if (sk_add_backlog(sk, skb)) - goto drop; - } - - goto done; - - case L2CAP_MODE_STREAMING: - control = get_unaligned_le16(skb->data); - skb_pull(skb, 2); - len = skb->len; - - if (l2cap_check_fcs(pi, skb)) - goto drop; - - if (__is_sar_start(control)) - len -= 2; - - if (pi->fcs == L2CAP_FCS_CRC16) - len -= 2; - - if (len > pi->mps || len < 0 || __is_sframe(control)) - goto drop; - - tx_seq = __get_txseq(control); - - if (pi->expected_tx_seq == tx_seq) - pi->expected_tx_seq = (pi->expected_tx_seq + 1) % 64; - else - pi->expected_tx_seq = (tx_seq + 1) % 64; - - l2cap_streaming_reassembly_sdu(sk, skb, control); - - goto done; - - default: - BT_DBG("sk %p: bad mode 0x%2.2x", sk, pi->mode); - break; - } - -drop: - kfree_skb(skb); - -done: - if (sk) - bh_unlock_sock(sk); - - return 0; -} - -static inline int l2cap_conless_channel(struct l2cap_conn *conn, __le16 psm, struct sk_buff *skb) -{ - struct sock *sk; - - sk = l2cap_get_sock_by_psm(0, psm, conn->src); - if (!sk) - goto drop; - - BT_DBG("sk %p, len %d", sk, skb->len); - - if (sk->sk_state != BT_BOUND && sk->sk_state != BT_CONNECTED) - goto drop; - - if (l2cap_pi(sk)->imtu < skb->len) - goto drop; - - if (!sock_queue_rcv_skb(sk, skb)) - goto done; - -drop: - kfree_skb(skb); - -done: - if (sk) - bh_unlock_sock(sk); - return 0; -} - -static void l2cap_recv_frame(struct l2cap_conn *conn, struct sk_buff *skb) -{ - struct l2cap_hdr *lh = (void *) skb->data; - u16 cid, len; - __le16 psm; - - skb_pull(skb, L2CAP_HDR_SIZE); - cid = __le16_to_cpu(lh->cid); - len = __le16_to_cpu(lh->len); - - if (len != skb->len) { - kfree_skb(skb); - return; - } - - BT_DBG("len %d, cid 0x%4.4x", len, cid); - - switch (cid) { - case L2CAP_CID_SIGNALING: - l2cap_sig_channel(conn, skb); - break; - - case L2CAP_CID_CONN_LESS: - psm = get_unaligned_le16(skb->data); - skb_pull(skb, 2); - l2cap_conless_channel(conn, psm, skb); - break; - - default: - l2cap_data_channel(conn, cid, skb); - break; - } -} - -/* ---- L2CAP interface with lower layer (HCI) ---- */ - -static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type) -{ - int exact = 0, lm1 = 0, lm2 = 0; - register struct sock *sk; - struct hlist_node *node; - - if (type != ACL_LINK) - return -EINVAL; - - BT_DBG("hdev %s, bdaddr %s", hdev->name, batostr(bdaddr)); - - /* Find listening sockets and check their link_mode */ - read_lock(&l2cap_sk_list.lock); - sk_for_each(sk, node, &l2cap_sk_list.head) { - if (sk->sk_state != BT_LISTEN) - continue; - - if (!bacmp(&bt_sk(sk)->src, &hdev->bdaddr)) { - lm1 |= HCI_LM_ACCEPT; - if (l2cap_pi(sk)->role_switch) - lm1 |= HCI_LM_MASTER; - exact++; - } else if (!bacmp(&bt_sk(sk)->src, BDADDR_ANY)) { - lm2 |= HCI_LM_ACCEPT; - if (l2cap_pi(sk)->role_switch) - lm2 |= HCI_LM_MASTER; - } - } - read_unlock(&l2cap_sk_list.lock); - - return exact ? lm1 : lm2; -} - -static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status) -{ - struct l2cap_conn *conn; - - BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status); - - if (hcon->type != ACL_LINK) - return -EINVAL; - - if (!status) { - conn = l2cap_conn_add(hcon, status); - if (conn) - l2cap_conn_ready(conn); - } else - l2cap_conn_del(hcon, bt_err(status)); - - return 0; -} - -static int l2cap_disconn_ind(struct hci_conn *hcon) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - - BT_DBG("hcon %p", hcon); - - if (hcon->type != ACL_LINK || !conn) - return 0x13; - - return conn->disc_reason; -} - -static int l2cap_disconn_cfm(struct hci_conn *hcon, u8 reason) -{ - BT_DBG("hcon %p reason %d", hcon, reason); - - if (hcon->type != ACL_LINK) - return -EINVAL; - - l2cap_conn_del(hcon, bt_err(reason)); - - return 0; -} - -static inline void l2cap_check_encryption(struct sock *sk, u8 encrypt) -{ - if (sk->sk_type != SOCK_SEQPACKET && sk->sk_type != SOCK_STREAM) - return; - - if (encrypt == 0x00) { - if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) { - l2cap_sock_clear_timer(sk); - l2cap_sock_set_timer(sk, HZ * 5); - } else if (l2cap_pi(sk)->sec_level == BT_SECURITY_HIGH) - __l2cap_sock_close(sk, ECONNREFUSED); - } else { - if (l2cap_pi(sk)->sec_level == BT_SECURITY_MEDIUM) - l2cap_sock_clear_timer(sk); - } -} - -static int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt) -{ - struct l2cap_chan_list *l; - struct l2cap_conn *conn = hcon->l2cap_data; - struct sock *sk; - - if (!conn) - return 0; - - l = &conn->chan_list; - - BT_DBG("conn %p", conn); - - read_lock(&l->lock); - - for (sk = l->head; sk; sk = l2cap_pi(sk)->next_c) { - bh_lock_sock(sk); - - if (l2cap_pi(sk)->conf_state & L2CAP_CONF_CONNECT_PEND) { - bh_unlock_sock(sk); - continue; - } - - if (!status && (sk->sk_state == BT_CONNECTED || - sk->sk_state == BT_CONFIG)) { - l2cap_check_encryption(sk, encrypt); - bh_unlock_sock(sk); - continue; - } - - if (sk->sk_state == BT_CONNECT) { - if (!status) { - struct l2cap_conn_req req; - req.scid = cpu_to_le16(l2cap_pi(sk)->scid); - req.psm = l2cap_pi(sk)->psm; - - l2cap_pi(sk)->ident = l2cap_get_ident(conn); - l2cap_pi(sk)->conf_state |= L2CAP_CONF_CONNECT_PEND; - - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_REQ, sizeof(req), &req); - } else { - l2cap_sock_clear_timer(sk); - l2cap_sock_set_timer(sk, HZ / 10); - } - } else if (sk->sk_state == BT_CONNECT2) { - struct l2cap_conn_rsp rsp; - __u16 result; - - if (!status) { - sk->sk_state = BT_CONFIG; - result = L2CAP_CR_SUCCESS; - } else { - sk->sk_state = BT_DISCONN; - l2cap_sock_set_timer(sk, HZ / 10); - result = L2CAP_CR_SEC_BLOCK; - } - - rsp.scid = cpu_to_le16(l2cap_pi(sk)->dcid); - rsp.dcid = cpu_to_le16(l2cap_pi(sk)->scid); - rsp.result = cpu_to_le16(result); - rsp.status = cpu_to_le16(L2CAP_CS_NO_INFO); - l2cap_send_cmd(conn, l2cap_pi(sk)->ident, - L2CAP_CONN_RSP, sizeof(rsp), &rsp); - } - - bh_unlock_sock(sk); - } - - read_unlock(&l->lock); - - return 0; -} - -static int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags) -{ - struct l2cap_conn *conn = hcon->l2cap_data; - - if (!conn && !(conn = l2cap_conn_add(hcon, 0))) - goto drop; - - BT_DBG("conn %p len %d flags 0x%x", conn, skb->len, flags); - - if (flags & ACL_START) { - struct l2cap_hdr *hdr; - int len; - - if (conn->rx_len) { - BT_ERR("Unexpected start frame (len %d)", skb->len); - kfree_skb(conn->rx_skb); - conn->rx_skb = NULL; - conn->rx_len = 0; - l2cap_conn_unreliable(conn, ECOMM); - } - - if (skb->len < 2) { - BT_ERR("Frame is too short (len %d)", skb->len); - l2cap_conn_unreliable(conn, ECOMM); - goto drop; - } - - hdr = (struct l2cap_hdr *) skb->data; - len = __le16_to_cpu(hdr->len) + L2CAP_HDR_SIZE; - - if (len == skb->len) { - /* Complete frame received */ - l2cap_recv_frame(conn, skb); - return 0; - } - - BT_DBG("Start: total len %d, frag len %d", len, skb->len); - - if (skb->len > len) { - BT_ERR("Frame is too long (len %d, expected len %d)", - skb->len, len); - l2cap_conn_unreliable(conn, ECOMM); - goto drop; - } - - /* Allocate skb for the complete frame (with header) */ - conn->rx_skb = bt_skb_alloc(len, GFP_ATOMIC); - if (!conn->rx_skb) - goto drop; - - skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), - skb->len); - conn->rx_len = len - skb->len; - } else { - BT_DBG("Cont: frag len %d (expecting %d)", skb->len, conn->rx_len); - - if (!conn->rx_len) { - BT_ERR("Unexpected continuation frame (len %d)", skb->len); - l2cap_conn_unreliable(conn, ECOMM); - goto drop; - } - - if (skb->len > conn->rx_len) { - BT_ERR("Fragment is too long (len %d, expected %d)", - skb->len, conn->rx_len); - kfree_skb(conn->rx_skb); - conn->rx_skb = NULL; - conn->rx_len = 0; - l2cap_conn_unreliable(conn, ECOMM); - goto drop; - } - - skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len), - skb->len); - conn->rx_len -= skb->len; - - if (!conn->rx_len) { - /* Complete frame received */ - l2cap_recv_frame(conn, conn->rx_skb); - conn->rx_skb = NULL; - } - } - -drop: - kfree_skb(skb); - return 0; -} - -static int l2cap_debugfs_show(struct seq_file *f, void *p) -{ - struct sock *sk; - struct hlist_node *node; - - read_lock_bh(&l2cap_sk_list.lock); - - sk_for_each(sk, node, &l2cap_sk_list.head) { - struct l2cap_pinfo *pi = l2cap_pi(sk); - - seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n", - batostr(&bt_sk(sk)->src), - batostr(&bt_sk(sk)->dst), - sk->sk_state, __le16_to_cpu(pi->psm), - pi->scid, pi->dcid, - pi->imtu, pi->omtu, pi->sec_level); - } - - read_unlock_bh(&l2cap_sk_list.lock); - - return 0; -} - -static int l2cap_debugfs_open(struct inode *inode, struct file *file) -{ - return single_open(file, l2cap_debugfs_show, inode->i_private); -} - -static const struct file_operations l2cap_debugfs_fops = { - .open = l2cap_debugfs_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -static struct dentry *l2cap_debugfs; - -static const struct proto_ops l2cap_sock_ops = { - .family = PF_BLUETOOTH, - .owner = THIS_MODULE, - .release = l2cap_sock_release, - .bind = l2cap_sock_bind, - .connect = l2cap_sock_connect, - .listen = l2cap_sock_listen, - .accept = l2cap_sock_accept, - .getname = l2cap_sock_getname, - .sendmsg = l2cap_sock_sendmsg, - .recvmsg = l2cap_sock_recvmsg, - .poll = bt_sock_poll, - .ioctl = bt_sock_ioctl, - .mmap = sock_no_mmap, - .socketpair = sock_no_socketpair, - .shutdown = l2cap_sock_shutdown, - .setsockopt = l2cap_sock_setsockopt, - .getsockopt = l2cap_sock_getsockopt -}; - -static const struct net_proto_family l2cap_sock_family_ops = { - .family = PF_BLUETOOTH, - .owner = THIS_MODULE, - .create = l2cap_sock_create, -}; - -static struct hci_proto l2cap_hci_proto = { - .name = "L2CAP", - .id = HCI_PROTO_L2CAP, - .connect_ind = l2cap_connect_ind, - .connect_cfm = l2cap_connect_cfm, - .disconn_ind = l2cap_disconn_ind, - .disconn_cfm = l2cap_disconn_cfm, - .security_cfm = l2cap_security_cfm, - .recv_acldata = l2cap_recv_acldata -}; - -static int __init l2cap_init(void) -{ - int err; - - err = proto_register(&l2cap_proto, 0); - if (err < 0) - return err; - - _busy_wq = create_singlethread_workqueue("l2cap"); - if (!_busy_wq) - goto error; - - err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); - if (err < 0) { - BT_ERR("L2CAP socket registration failed"); - goto error; - } - - err = hci_register_proto(&l2cap_hci_proto); - if (err < 0) { - BT_ERR("L2CAP protocol registration failed"); - bt_sock_unregister(BTPROTO_L2CAP); - goto error; - } - - if (bt_debugfs) { - l2cap_debugfs = debugfs_create_file("l2cap", 0444, - bt_debugfs, NULL, &l2cap_debugfs_fops); - if (!l2cap_debugfs) - BT_ERR("Failed to create L2CAP debug file"); - } - - BT_INFO("L2CAP ver %s", VERSION); - BT_INFO("L2CAP socket layer initialized"); - - return 0; - -error: - proto_unregister(&l2cap_proto); - return err; -} - -static void __exit l2cap_exit(void) -{ - debugfs_remove(l2cap_debugfs); - - flush_workqueue(_busy_wq); - destroy_workqueue(_busy_wq); - - if (bt_sock_unregister(BTPROTO_L2CAP) < 0) - BT_ERR("L2CAP socket unregistration failed"); - - if (hci_unregister_proto(&l2cap_hci_proto) < 0) - BT_ERR("L2CAP protocol unregistration failed"); - - proto_unregister(&l2cap_proto); -} - -void l2cap_load(void) -{ - /* Dummy function to trigger automatic L2CAP module loading by - * other modules that use L2CAP sockets but don't use any other - * symbols from it. */ -} -EXPORT_SYMBOL(l2cap_load); - -module_init(l2cap_init); -module_exit(l2cap_exit); - -module_param(enable_ertm, bool, 0644); -MODULE_PARM_DESC(enable_ertm, "Enable enhanced retransmission mode"); - -MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); -MODULE_DESCRIPTION("Bluetooth L2CAP ver " VERSION); -MODULE_VERSION(VERSION); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("bt-proto-0"); diff --git a/net/bluetooth/l2cap/sock.c b/net/bluetooth/l2cap/sock.c new file mode 100644 index 0000000..76975f3 --- /dev/null +++ b/net/bluetooth/l2cap/sock.c @@ -0,0 +1,27 @@ +/* + BlueZ - Bluetooth protocol stack for Linux + Copyright (C) 2000-2001 Qualcomm Incorporated + Copyright (C) 2009-2010 Gustavo F. Padovan <gustavo@padovan.org> + + Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License version 2 as + published by the Free Software Foundation; + + THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. + IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY + CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES + WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + + ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, + COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS + SOFTWARE IS DISCLAIMED. +*/ + +/* Bluetooth L2CAP sockets. */ + -- 1.7.1 ^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH 5/5] Bluetooth: first move for L2CAP split 2010-07-13 14:57 ` [PATCH 4/5] Bluetooth: Prepare l2cap for split Gustavo F. Padovan @ 2010-07-13 14:57 ` Gustavo F. Padovan 0 siblings, 0 replies; 9+ messages in thread From: Gustavo F. Padovan @ 2010-07-13 14:57 UTC (permalink / raw) To: linux-bluetooth; +Cc: marcel, Gustavo F. Padovan From: Gustavo F. Padovan <padovan@profusion.mobi> By now l2cap_sock_create and its dependencies were moved to sock.c Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> --- include/net/bluetooth/l2cap.h | 12 +++ net/bluetooth/l2cap/core.c | 173 ++-------------------------------------- net/bluetooth/l2cap/sock.c | 174 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 195 insertions(+), 164 deletions(-) diff --git a/include/net/bluetooth/l2cap.h b/include/net/bluetooth/l2cap.h index d030302..0fca782 100644 --- a/include/net/bluetooth/l2cap.h +++ b/include/net/bluetooth/l2cap.h @@ -422,6 +422,18 @@ static inline int l2cap_tx_window_full(struct sock *sk) #define __is_sframe(ctrl) (ctrl) & L2CAP_CTRL_FRAME_TYPE #define __is_sar_start(ctrl) ((ctrl) & L2CAP_CTRL_SAR) == L2CAP_SDU_START +extern int enable_ertm; +extern const struct proto_ops l2cap_sock_ops; +extern struct bt_sock_list l2cap_sk_list; + +int l2cap_init_sockets(void); +void l2cap_cleanup_sockets(void); + +void __l2cap_sock_close(struct sock *sk, int reason); +void l2cap_sock_kill(struct sock *sk); +void l2cap_sock_init(struct sock *sk, struct sock *parent); +struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio); + void l2cap_load(void); #endif /* __L2CAP_H */ diff --git a/net/bluetooth/l2cap/core.c b/net/bluetooth/l2cap/core.c index cdd608d..d0c4068 100644 --- a/net/bluetooth/l2cap/core.c +++ b/net/bluetooth/l2cap/core.c @@ -56,24 +56,21 @@ #define VERSION "2.15" -static int enable_ertm = 0; +int enable_ertm = 0; static u32 l2cap_feat_mask = L2CAP_FEAT_FIXED_CHAN; static u8 l2cap_fixed_chan[8] = { 0x02, }; -static const struct proto_ops l2cap_sock_ops; - static struct workqueue_struct *_busy_wq; -static struct bt_sock_list l2cap_sk_list = { +struct bt_sock_list l2cap_sk_list = { .lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock) }; static void l2cap_busy_work(struct work_struct *work); -static void __l2cap_sock_close(struct sock *sk, int reason); static void l2cap_sock_close(struct sock *sk); -static void l2cap_sock_kill(struct sock *sk); +void l2cap_sock_kill(struct sock *sk); static int l2cap_build_conf_req(struct sock *sk, void *data); static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, @@ -82,31 +79,6 @@ static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb); /* ---- L2CAP timers ---- */ -static void l2cap_sock_timeout(unsigned long arg) -{ - struct sock *sk = (struct sock *) arg; - int reason; - - BT_DBG("sock %p state %d", sk, sk->sk_state); - - bh_lock_sock(sk); - - if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) - reason = ECONNREFUSED; - else if (sk->sk_state == BT_CONNECT && - l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) - reason = ECONNREFUSED; - else - reason = ETIMEDOUT; - - __l2cap_sock_close(sk, reason); - - bh_unlock_sock(sk); - - l2cap_sock_kill(sk); - sock_put(sk); -} - static void l2cap_sock_set_timer(struct sock *sk, long timeout) { BT_DBG("sk %p state %d timeout %ld", sk, sk->sk_state, timeout); @@ -777,14 +749,6 @@ static inline struct sock *l2cap_get_sock_by_psm(int state, __le16 psm, bdaddr_t return s; } -static void l2cap_sock_destruct(struct sock *sk) -{ - BT_DBG("sk %p", sk); - - skb_queue_purge(&sk->sk_receive_queue); - skb_queue_purge(&sk->sk_write_queue); -} - static void l2cap_sock_cleanup_listen(struct sock *parent) { struct sock *sk; @@ -802,7 +766,7 @@ static void l2cap_sock_cleanup_listen(struct sock *parent) /* Kill socket (only if zapped and orphan) * Must be called on unlocked socket. */ -static void l2cap_sock_kill(struct sock *sk) +void l2cap_sock_kill(struct sock *sk) { if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) return; @@ -815,7 +779,7 @@ static void l2cap_sock_kill(struct sock *sk) sock_put(sk); } -static void __l2cap_sock_close(struct sock *sk, int reason) +void __l2cap_sock_close(struct sock *sk, int reason) { BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket); @@ -879,109 +843,6 @@ static void l2cap_sock_close(struct sock *sk) l2cap_sock_kill(sk); } -static void l2cap_sock_init(struct sock *sk, struct sock *parent) -{ - struct l2cap_pinfo *pi = l2cap_pi(sk); - - BT_DBG("sk %p", sk); - - if (parent) { - sk->sk_type = parent->sk_type; - bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; - - pi->imtu = l2cap_pi(parent)->imtu; - pi->omtu = l2cap_pi(parent)->omtu; - pi->conf_state = l2cap_pi(parent)->conf_state; - pi->mode = l2cap_pi(parent)->mode; - pi->fcs = l2cap_pi(parent)->fcs; - pi->max_tx = l2cap_pi(parent)->max_tx; - pi->tx_win = l2cap_pi(parent)->tx_win; - pi->sec_level = l2cap_pi(parent)->sec_level; - pi->role_switch = l2cap_pi(parent)->role_switch; - pi->force_reliable = l2cap_pi(parent)->force_reliable; - } else { - pi->imtu = L2CAP_DEFAULT_MTU; - pi->omtu = 0; - if (enable_ertm && sk->sk_type == SOCK_STREAM) { - pi->mode = L2CAP_MODE_ERTM; - pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; - } else { - pi->mode = L2CAP_MODE_BASIC; - } - pi->max_tx = L2CAP_DEFAULT_MAX_TX; - pi->fcs = L2CAP_FCS_CRC16; - pi->tx_win = L2CAP_DEFAULT_TX_WINDOW; - pi->sec_level = BT_SECURITY_LOW; - pi->role_switch = 0; - pi->force_reliable = 0; - } - - /* Default config options */ - pi->conf_len = 0; - pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; - skb_queue_head_init(TX_QUEUE(sk)); - skb_queue_head_init(SREJ_QUEUE(sk)); - skb_queue_head_init(BUSY_QUEUE(sk)); - INIT_LIST_HEAD(SREJ_LIST(sk)); -} - -static struct proto l2cap_proto = { - .name = "L2CAP", - .owner = THIS_MODULE, - .obj_size = sizeof(struct l2cap_pinfo) -}; - -static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) -{ - struct sock *sk; - - sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); - if (!sk) - return NULL; - - sock_init_data(sock, sk); - INIT_LIST_HEAD(&bt_sk(sk)->accept_q); - - sk->sk_destruct = l2cap_sock_destruct; - sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); - - sock_reset_flag(sk, SOCK_ZAPPED); - - sk->sk_protocol = proto; - sk->sk_state = BT_OPEN; - - setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); - - bt_sock_link(&l2cap_sk_list, sk); - return sk; -} - -static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, - int kern) -{ - struct sock *sk; - - BT_DBG("sock %p", sock); - - sock->state = SS_UNCONNECTED; - - if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && - sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) - return -ESOCKTNOSUPPORT; - - if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) - return -EPERM; - - sock->ops = &l2cap_sock_ops; - - sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); - if (!sk) - return -ENOMEM; - - l2cap_sock_init(sk, NULL); - return 0; -} - static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) { struct sock *sk = sock->sk; @@ -4743,7 +4604,7 @@ static const struct file_operations l2cap_debugfs_fops = { static struct dentry *l2cap_debugfs; -static const struct proto_ops l2cap_sock_ops = { +const struct proto_ops l2cap_sock_ops = { .family = PF_BLUETOOTH, .owner = THIS_MODULE, .release = l2cap_sock_release, @@ -4763,12 +4624,6 @@ static const struct proto_ops l2cap_sock_ops = { .getsockopt = l2cap_sock_getsockopt }; -static const struct net_proto_family l2cap_sock_family_ops = { - .family = PF_BLUETOOTH, - .owner = THIS_MODULE, - .create = l2cap_sock_create, -}; - static struct hci_proto l2cap_hci_proto = { .name = "L2CAP", .id = HCI_PROTO_L2CAP, @@ -4784,7 +4639,7 @@ static int __init l2cap_init(void) { int err; - err = proto_register(&l2cap_proto, 0); + err = l2cap_init_sockets(); if (err < 0) return err; @@ -4792,16 +4647,9 @@ static int __init l2cap_init(void) if (!_busy_wq) goto error; - err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); - if (err < 0) { - BT_ERR("L2CAP socket registration failed"); - goto error; - } - err = hci_register_proto(&l2cap_hci_proto); if (err < 0) { BT_ERR("L2CAP protocol registration failed"); - bt_sock_unregister(BTPROTO_L2CAP); goto error; } @@ -4818,7 +4666,7 @@ static int __init l2cap_init(void) return 0; error: - proto_unregister(&l2cap_proto); + l2cap_cleanup_sockets(); return err; } @@ -4829,13 +4677,10 @@ static void __exit l2cap_exit(void) flush_workqueue(_busy_wq); destroy_workqueue(_busy_wq); - if (bt_sock_unregister(BTPROTO_L2CAP) < 0) - BT_ERR("L2CAP socket unregistration failed"); - if (hci_unregister_proto(&l2cap_hci_proto) < 0) BT_ERR("L2CAP protocol unregistration failed"); - proto_unregister(&l2cap_proto); + l2cap_cleanup_sockets(); } void l2cap_load(void) diff --git a/net/bluetooth/l2cap/sock.c b/net/bluetooth/l2cap/sock.c index 76975f3..d28d11e 100644 --- a/net/bluetooth/l2cap/sock.c +++ b/net/bluetooth/l2cap/sock.c @@ -25,3 +25,177 @@ /* Bluetooth L2CAP sockets. */ +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/l2cap.h> + +static void l2cap_sock_timeout(unsigned long arg) +{ + struct sock *sk = (struct sock *) arg; + int reason; + + BT_DBG("sock %p state %d", sk, sk->sk_state); + + bh_lock_sock(sk); + + if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONFIG) + reason = ECONNREFUSED; + else if (sk->sk_state == BT_CONNECT && + l2cap_pi(sk)->sec_level != BT_SECURITY_SDP) + reason = ECONNREFUSED; + else + reason = ETIMEDOUT; + + __l2cap_sock_close(sk, reason); + + bh_unlock_sock(sk); + + l2cap_sock_kill(sk); + sock_put(sk); +} + +static void l2cap_sock_destruct(struct sock *sk) +{ + BT_DBG("sk %p", sk); + + skb_queue_purge(&sk->sk_receive_queue); + skb_queue_purge(&sk->sk_write_queue); +} + +void l2cap_sock_init(struct sock *sk, struct sock *parent) +{ + struct l2cap_pinfo *pi = l2cap_pi(sk); + + BT_DBG("sk %p", sk); + + if (parent) { + sk->sk_type = parent->sk_type; + bt_sk(sk)->defer_setup = bt_sk(parent)->defer_setup; + + pi->imtu = l2cap_pi(parent)->imtu; + pi->omtu = l2cap_pi(parent)->omtu; + pi->conf_state = l2cap_pi(parent)->conf_state; + pi->mode = l2cap_pi(parent)->mode; + pi->fcs = l2cap_pi(parent)->fcs; + pi->max_tx = l2cap_pi(parent)->max_tx; + pi->tx_win = l2cap_pi(parent)->tx_win; + pi->sec_level = l2cap_pi(parent)->sec_level; + pi->role_switch = l2cap_pi(parent)->role_switch; + pi->force_reliable = l2cap_pi(parent)->force_reliable; + } else { + pi->imtu = L2CAP_DEFAULT_MTU; + pi->omtu = 0; + if (enable_ertm && sk->sk_type == SOCK_STREAM) { + pi->mode = L2CAP_MODE_ERTM; + pi->conf_state |= L2CAP_CONF_STATE2_DEVICE; + } else { + pi->mode = L2CAP_MODE_BASIC; + } + pi->max_tx = L2CAP_DEFAULT_MAX_TX; + pi->fcs = L2CAP_FCS_CRC16; + pi->tx_win = L2CAP_DEFAULT_TX_WINDOW; + pi->sec_level = BT_SECURITY_LOW; + pi->role_switch = 0; + pi->force_reliable = 0; + } + + /* Default config options */ + pi->conf_len = 0; + pi->flush_to = L2CAP_DEFAULT_FLUSH_TO; + skb_queue_head_init(TX_QUEUE(sk)); + skb_queue_head_init(SREJ_QUEUE(sk)); + skb_queue_head_init(BUSY_QUEUE(sk)); + INIT_LIST_HEAD(SREJ_LIST(sk)); +} + +static struct proto l2cap_proto = { + .name = "L2CAP", + .owner = THIS_MODULE, + .obj_size = sizeof(struct l2cap_pinfo) +}; + +struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio) +{ + struct sock *sk; + + sk = sk_alloc(net, PF_BLUETOOTH, prio, &l2cap_proto); + if (!sk) + return NULL; + + sock_init_data(sock, sk); + INIT_LIST_HEAD(&bt_sk(sk)->accept_q); + + sk->sk_destruct = l2cap_sock_destruct; + sk->sk_sndtimeo = msecs_to_jiffies(L2CAP_CONN_TIMEOUT); + + sock_reset_flag(sk, SOCK_ZAPPED); + + sk->sk_protocol = proto; + sk->sk_state = BT_OPEN; + + setup_timer(&sk->sk_timer, l2cap_sock_timeout, (unsigned long) sk); + + bt_sock_link(&l2cap_sk_list, sk); + return sk; +} + +static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol, + int kern) +{ + struct sock *sk; + + BT_DBG("sock %p", sock); + + sock->state = SS_UNCONNECTED; + + if (sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM && + sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) + return -ESOCKTNOSUPPORT; + + if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) + return -EPERM; + + sock->ops = &l2cap_sock_ops; + + sk = l2cap_sock_alloc(net, sock, protocol, GFP_ATOMIC); + if (!sk) + return -ENOMEM; + + l2cap_sock_init(sk, NULL); + return 0; +} + +static const struct net_proto_family l2cap_sock_family_ops = { + .family = PF_BLUETOOTH, + .owner = THIS_MODULE, + .create = l2cap_sock_create, +}; + +int __init l2cap_init_sockets(void) +{ + int err; + + err = proto_register(&l2cap_proto, 0); + if (err < 0) + return err; + + err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops); + if (err < 0) + goto error; + + BT_INFO("L2CAP socket layer initialized"); + + return 0; + +error: + BT_ERR("L2CAP socket registration failed"); + proto_unregister(&l2cap_proto); + return err; +} + +void l2cap_cleanup_sockets(void) +{ + if (bt_sock_unregister(BTPROTO_L2CAP) < 0) + BT_ERR("L2CAP socket unregistration failed"); + + proto_unregister(&l2cap_proto); +} -- 1.7.1 ^ permalink raw reply related [flat|nested] 9+ messages in thread
* Re: [PATCH 3/5] Bluetooth: create a l2cap dir 2010-07-13 14:57 ` [PATCH 3/5] Bluetooth: create a l2cap dir Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 4/5] Bluetooth: Prepare l2cap for split Gustavo F. Padovan @ 2010-07-13 17:13 ` Marcel Holtmann 2010-07-15 20:03 ` Gustavo F. Padovan 1 sibling, 1 reply; 9+ messages in thread From: Marcel Holtmann @ 2010-07-13 17:13 UTC (permalink / raw) To: Gustavo F. Padovan; +Cc: linux-bluetooth, Gustavo F. Padovan Hi Gustavo, > The dir is being created looking forward to the l2cap.c split. > > Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> > --- > net/bluetooth/Makefile | 2 +- > net/bluetooth/l2cap.c | 4859 ------------------------------------------ > net/bluetooth/l2cap/Makefile | 5 + > net/bluetooth/l2cap/l2cap.c | 4859 ++++++++++++++++++++++++++++++++++++++++++ > 4 files changed, 4865 insertions(+), 4860 deletions(-) > delete mode 100644 net/bluetooth/l2cap.c > create mode 100644 net/bluetooth/l2cap/Makefile > create mode 100644 net/bluetooth/l2cap/l2cap.c hold off with this changes. We are not doing a separate directory anyway. I need more time to think about it. Regards Marcel ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH 3/5] Bluetooth: create a l2cap dir 2010-07-13 17:13 ` [PATCH 3/5] Bluetooth: create a l2cap dir Marcel Holtmann @ 2010-07-15 20:03 ` Gustavo F. Padovan 0 siblings, 0 replies; 9+ messages in thread From: Gustavo F. Padovan @ 2010-07-15 20:03 UTC (permalink / raw) To: Marcel Holtmann; +Cc: linux-bluetooth, Gustavo F. Padovan Hi Marcel, * Marcel Holtmann <marcel@holtmann.org> [2010-07-13 14:13:48 -0300]: > Hi Gustavo, > > > The dir is being created looking forward to the l2cap.c split. > > > > Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> > > --- > > net/bluetooth/Makefile | 2 +- > > net/bluetooth/l2cap.c | 4859 ------------------------------------------ > > net/bluetooth/l2cap/Makefile | 5 + > > net/bluetooth/l2cap/l2cap.c | 4859 ++++++++++++++++++++++++++++++++++++++++++ > > 4 files changed, 4865 insertions(+), 4860 deletions(-) > > delete mode 100644 net/bluetooth/l2cap.c > > create mode 100644 net/bluetooth/l2cap/Makefile > > create mode 100644 net/bluetooth/l2cap/l2cap.c > > hold off with this changes. We are not doing a separate directory > anyway. I need more time to think about it. Ok, so I can go with that inside the bluetooth directory. But we need to sort this out soon. I think we can't go ahead with the L2CAP AMP changes without split l2cap.c first, otherwise it will be very hard to split l2cap.c in the future. -- Gustavo F. Padovan http://padovan.org ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH 2/5] Bluetooth: update L2CAP version 2010-07-13 14:57 ` [PATCH 2/5] Bluetooth: update L2CAP version Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 3/5] Bluetooth: create a l2cap dir Gustavo F. Padovan @ 2010-07-13 17:12 ` Marcel Holtmann 1 sibling, 0 replies; 9+ messages in thread From: Marcel Holtmann @ 2010-07-13 17:12 UTC (permalink / raw) To: Gustavo F. Padovan; +Cc: linux-bluetooth, Gustavo F. Padovan Hi Gustavo, > We did some changes on the L2CAP configuration process and its behaviour > is bit different now. That justifies a updated on the L2CAP version. > > Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> > --- > net/bluetooth/l2cap.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) patch has been applied. Thanks. Regards Marcel ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH 1/5] Bluetooth: Add Copyright notice to L2CAP 2010-07-13 14:57 [PATCH 1/5] Bluetooth: Add Copyright notice to L2CAP Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 2/5] Bluetooth: update L2CAP version Gustavo F. Padovan @ 2010-07-13 17:11 ` Marcel Holtmann 1 sibling, 0 replies; 9+ messages in thread From: Marcel Holtmann @ 2010-07-13 17:11 UTC (permalink / raw) To: Gustavo F. Padovan; +Cc: linux-bluetooth, Gustavo F. Padovan Hi Gustavo, > Copyright for the time I worked on L2CAP during the Google Summer of Code > program. > > Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> > --- > include/net/bluetooth/l2cap.h | 1 + > net/bluetooth/l2cap.c | 1 + > 2 files changed, 2 insertions(+), 0 deletions(-) patch has been applied. Thanks. Regards Marcel ^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2010-07-15 20:03 UTC | newest] Thread overview: 9+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2010-07-13 14:57 [PATCH 1/5] Bluetooth: Add Copyright notice to L2CAP Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 2/5] Bluetooth: update L2CAP version Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 3/5] Bluetooth: create a l2cap dir Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 4/5] Bluetooth: Prepare l2cap for split Gustavo F. Padovan 2010-07-13 14:57 ` [PATCH 5/5] Bluetooth: first move for L2CAP split Gustavo F. Padovan 2010-07-13 17:13 ` [PATCH 3/5] Bluetooth: create a l2cap dir Marcel Holtmann 2010-07-15 20:03 ` Gustavo F. Padovan 2010-07-13 17:12 ` [PATCH 2/5] Bluetooth: update L2CAP version Marcel Holtmann 2010-07-13 17:11 ` [PATCH 1/5] Bluetooth: Add Copyright notice to L2CAP Marcel Holtmann
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