[PATCH v13 net-next 11/12] crypto: chtls - Register chtls with net tls

Atul Gupta
2018-03-27T17:36:40Z

Register chtls as Inline TLS driver, chtls is ULD to cxgb4.
Setsockopt to program (tx/rx) keys on chip.
Support AES GCM of key size 128.
Support both Inline Rx and Tx.

Signed-off-by: Atul Gupta <atul.gupta@chelsio.com>
Reviewed-by: Casey Leedom <leedom@chelsio.com>
Reviewed-by: Michael Werner <werner@chelsio.com>
---
drivers/crypto/chelsio/chtls/chtls_main.c | 564 ++++++++++++++++++++++++++++++
1 file changed, 564 insertions(+)
create mode 100644 drivers/crypto/chelsio/chtls/chtls_main.c

diff --git a/drivers/crypto/chelsio/chtls/chtls_main.c b/drivers/crypto/chelsio/chtls/chtls_main.c
new file mode 100644
index 0000000..642e864
--- /dev/null
+++ b/drivers/crypto/chelsio/chtls/chtls_main.c
@@ -0,0 +1,564 @@
+/*
+ * Copyright (c) 2018 Chelsio Communications, Inc.
+ *
+ * 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.
+ *
+ * Written by: Atul Gupta (atul.gupta@chelsio.com)
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/hash.h>
+#include <linux/in.h>
+#include <linux/net.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <net/tcp.h>
+#include <net/tls.h>
+
+#include "chtls.h"
+#include "chtls_cm.h"
+
+#define DRV_NAME "chtls"
+
+/*
+ * chtls device management
+ * maintains a list of the chtls devices
+ */
+static LIST_HEAD(cdev_list);
+static DEFINE_MUTEX(cdev_mutex);
+static DEFINE_MUTEX(cdev_list_lock);
+
+static DEFINE_MUTEX(notify_mutex);
+static RAW_NOTIFIER_HEAD(listen_notify_list);
+static struct proto chtls_cpl_prot;
+struct request_sock_ops chtls_rsk_ops;
+static uint send_page_order = (14 - PAGE_SHIFT < 0) ? 0 : 14 - PAGE_SHIFT;
+
+static void register_listen_notifier(struct notifier_block *nb)
+{
+ mutex_lock(&notify_mutex);
+ raw_notifier_chain_register(&listen_notify_list, nb);
+ mutex_unlock(&notify_mutex);
+}
+
+static void unregister_listen_notifier(struct notifier_block *nb)
+{
+ mutex_lock(&notify_mutex);
+ raw_notifier_chain_unregister(&listen_notify_list, nb);
+ mutex_unlock(&notify_mutex);
+}
+
+static int listen_notify_handler(struct notifier_block *this,
+ unsigned long event, void *data)
+{
+ struct sock *sk = data;
+ struct chtls_dev *cdev;
+ int ret = NOTIFY_DONE;
+
+ switch (event) {
+ case CHTLS_LISTEN_START:
+ case CHTLS_LISTEN_STOP:
+ mutex_lock(&cdev_list_lock);
+ list_for_each_entry(cdev, &cdev_list, list) {
+ if (event == CHTLS_LISTEN_START)
+ ret = chtls_listen_start(cdev, sk);
+ else
+ chtls_listen_stop(cdev, sk);
+ }
+ mutex_unlock(&cdev_list_lock);
+ break;
+ }
+ return ret;
+}
+
+static struct notifier_block listen_notifier = {
+ .notifier_call = listen_notify_handler
+};
+
+static int listen_backlog_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ if (likely(skb_transport_header(skb) != skb_network_header(skb)))
+ return tcp_v4_do_rcv(sk, skb);
+ BLOG_SKB_CB(skb)->backlog_rcv(sk, skb);
+ return 0;
+}
+
+static int chtls_start_listen(struct sock *sk)
+{
+ int err;
+
+ if (sk->sk_protocol != IPPROTO_TCP)
+ return -EPROTONOSUPPORT;
+
+ if (sk->sk_family == PF_INET &&
+ LOOPBACK(inet_sk(sk)->inet_rcv_saddr))
+ return -EADDRNOTAVAIL;
+
+ sk->sk_backlog_rcv = listen_backlog_rcv;
+ mutex_lock(&notify_mutex);
+ err = raw_notifier_call_chain(&listen_notify_list,
+ CHTLS_LISTEN_START, sk);
+ mutex_unlock(&notify_mutex);
+ return err;
+}
+
+static void chtls_stop_listen(struct sock *sk)
+{
+ if (sk->sk_protocol != IPPROTO_TCP)
+ return;
+
+ mutex_lock(&notify_mutex);
+ raw_notifier_call_chain(&listen_notify_list,
+ CHTLS_LISTEN_STOP, sk);
+ mutex_unlock(&notify_mutex);
+}
+
+static int chtls_inline_feature(struct tls_device *dev)
+{
+ struct chtls_dev *cdev = to_chtls_dev(dev);
+ struct net_device *netdev;
+ int i;
+
+ for (i = 0; i < cdev->lldi->nports; i++) {
+ netdev = cdev->ports[i];
+ if (netdev->features & NETIF_F_HW_TLS_RECORD)
+ return 1;
+ }
+ return 0;
+}
+
+static int chtls_create_hash(struct tls_device *dev, struct sock *sk)
+{
+ if (sk->sk_state == TCP_LISTEN)
+ return chtls_start_listen(sk);
+ return 0;
+}
+
+static void chtls_destroy_hash(struct tls_device *dev, struct sock *sk)
+{
+ if (sk->sk_state == TCP_LISTEN)
+ chtls_stop_listen(sk);
+}
+
+static void chtls_register_dev(struct chtls_dev *cdev)
+{
+ struct tls_device *tlsdev = &cdev->tlsdev;
+
+ strlcpy(tlsdev->name, "chtls", TLS_DEVICE_NAME_MAX);
+ strlcat(tlsdev->name, cdev->lldi->ports[0]->name,
+ TLS_DEVICE_NAME_MAX);
+ tlsdev->feature = chtls_inline_feature;
+ tlsdev->hash = chtls_create_hash;
+ tlsdev->unhash = chtls_destroy_hash;
+ tls_register_device(&cdev->tlsdev);
+}
+
+static void chtls_unregister_dev(struct chtls_dev *cdev)
+{
+ tls_unregister_device(&cdev->tlsdev);
+}
+
+static void process_deferq(struct work_struct *task_param)
+{
+ struct chtls_dev *cdev = container_of(task_param,
+ struct chtls_dev, deferq_task);
+ struct sk_buff *skb;
+
+ spin_lock_bh(&cdev->deferq.lock);
+ while ((skb = __skb_dequeue(&cdev->deferq)) != NULL) {
+ spin_unlock_bh(&cdev->deferq.lock);
+ DEFERRED_SKB_CB(skb)->handler(cdev, skb);
+ spin_lock_bh(&cdev->deferq.lock);
+ }
+ spin_unlock_bh(&cdev->deferq.lock);
+}
+
+static int chtls_get_skb(struct chtls_dev *cdev)
+{
+ cdev->askb = alloc_skb(sizeof(struct tcphdr), GFP_KERNEL);
+ if (!cdev->askb)
+ return -ENOMEM;
+
+ skb_put(cdev->askb, sizeof(struct tcphdr));
+ skb_reset_transport_header(cdev->askb);
+ memset(cdev->askb->data, 0, cdev->askb->len);
+ return 0;
+}
+
+static void *chtls_uld_add(const struct cxgb4_lld_info *info)
+{
+ struct cxgb4_lld_info *lldi;
+ struct chtls_dev *cdev;
+ int i, j;
+
+ cdev = kzalloc(sizeof(*cdev) + info->nports *
+ (sizeof(struct net_device *)), GFP_KERNEL);
+ if (!cdev)
+ goto out;
+
+ lldi = kzalloc(sizeof(*lldi), GFP_KERNEL);
+ if (!lldi)
+ goto out_lldi;
+
+ if (chtls_get_skb(cdev))
+ goto out_skb;
+
+ *lldi = *info;
+ cdev->lldi = lldi;
+ cdev->pdev = lldi->pdev;
+ cdev->tids = lldi->tids;
+ cdev->ports = (struct net_device **)(cdev + 1);
+ cdev->ports = lldi->ports;
+ cdev->mtus = lldi->mtus;
+ cdev->tids = lldi->tids;
+ cdev->pfvf = FW_VIID_PFN_G(cxgb4_port_viid(lldi->ports[0]))
+ << FW_VIID_PFN_S;
+
+ for (i = 0; i < (1 << RSPQ_HASH_BITS); i++) {
+ unsigned int size = 64 - sizeof(struct rsp_ctrl) - 8;
+
+ cdev->rspq_skb_cache[i] = __alloc_skb(size,
+ gfp_any(), 0,
+ lldi->nodeid);
+ if (unlikely(!cdev->rspq_skb_cache[i]))
+ goto out_rspq_skb;
+ }
+
+ idr_init(&cdev->hwtid_idr);
+ INIT_WORK(&cdev->deferq_task, process_deferq);
+ spin_lock_init(&cdev->listen_lock);
+ spin_lock_init(&cdev->idr_lock);
+ cdev->send_page_order = min_t(uint, get_order(32768),
+ send_page_order);
+
+ if (lldi->vr->key.size)
+ if (chtls_init_kmap(cdev, lldi))
+ goto out_rspq_skb;
+
+ mutex_lock(&cdev_mutex);
+ list_add_tail(&cdev->list, &cdev_list);
+ mutex_unlock(&cdev_mutex);
+
+ return cdev;
+out_rspq_skb:
+ for (j = 0; j <= i; j++)
+ kfree_skb(cdev->rspq_skb_cache[j]);
+ kfree_skb(cdev->askb);
+out_skb:
+ kfree(lldi);
+out_lldi:
+ kfree(cdev);
+out:
+ return NULL;
+}
+
+static void chtls_free_uld(struct chtls_dev *cdev)
+{
+ int i;
+
+ chtls_unregister_dev(cdev);
+ kvfree(cdev->kmap.addr);
+ idr_destroy(&cdev->hwtid_idr);
+ for (i = 0; i < (1 << RSPQ_HASH_BITS); i++)
+ kfree_skb(cdev->rspq_skb_cache[i]);
+ kfree(cdev->lldi);
+ if (cdev->askb)
+ kfree_skb(cdev->askb);
+ kfree(cdev);
+}
+
+static void chtls_free_all_uld(void)
+{
+ struct chtls_dev *cdev, *tmp;
+
+ mutex_lock(&cdev_mutex);
+ list_for_each_entry_safe(cdev, tmp, &cdev_list, list)
+ chtls_free_uld(cdev);
+ mutex_unlock(&cdev_mutex);
+}
+
+static int chtls_uld_state_change(void *handle, enum cxgb4_state new_state)
+{
+ struct chtls_dev *cdev = handle;
+
+ switch (new_state) {
+ case CXGB4_STATE_UP:
+ chtls_register_dev(cdev);
+ break;
+ case CXGB4_STATE_DOWN:
+ break;
+ case CXGB4_STATE_START_RECOVERY:
+ break;
+ case CXGB4_STATE_DETACH:
+ mutex_lock(&cdev_mutex);
+ list_del(&cdev->list);
+ mutex_unlock(&cdev_mutex);
+ chtls_free_uld(cdev);
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+static struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
+ const __be64 *rsp,
+ u32 pktshift)
+{
+ struct sk_buff *skb;
+
+ /* Allocate space for cpl_pass_accpet_req which will be synthesized by
+ * driver. Once driver synthesizes cpl_pass_accpet_req the skb will go
+ * through the regular cpl_pass_accept_req processing in TOM.
+ */
+ skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req)
+ - pktshift, GFP_ATOMIC);
+ if (unlikely(!skb))
+ return NULL;
+ __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req)
+ - pktshift);
+ /* For now we will copy cpl_rx_pkt in the skb */
+ skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_rx_pkt));
+ skb_copy_to_linear_data_offset(skb, sizeof(struct cpl_pass_accept_req)
+ , gl->va + pktshift,
+ gl->tot_len - pktshift);
+
+ return skb;
+}
+
+static int chtls_recv_packet(struct chtls_dev *cdev,
+ const struct pkt_gl *gl, const __be64 *rsp)
+{
+ unsigned int opcode = *(u8 *)rsp;
+ struct sk_buff *skb;
+ int ret;
+
+ skb = copy_gl_to_skb_pkt(gl, rsp, cdev->lldi->sge_pktshift);
+ if (!skb)
+ return -ENOMEM;
+
+ ret = chtls_handlers[opcode](cdev, skb);
+ if (ret & CPL_RET_BUF_DONE)
+ kfree_skb(skb);
+
+ return 0;
+}
+
+static int chtls_recv_rsp(struct chtls_dev *cdev, const __be64 *rsp)
+{
+ unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
+ unsigned int opcode = *(u8 *)rsp;
+ unsigned long rspq_bin;
+ struct sk_buff *skb;
+ int ret;
+
+ rspq_bin = hash_ptr((void *)rsp, RSPQ_HASH_BITS);
+ skb = cdev->rspq_skb_cache[rspq_bin];
+ if (skb && !skb_is_nonlinear(skb) &&
+ !skb_shared(skb) && !skb_cloned(skb)) {
+ refcount_inc(&skb->users);
+ if (refcount_read(&skb->users) == 2) {
+ __skb_trim(skb, 0);
+ if (skb_tailroom(skb) >= len)
+ goto copy_out;
+ }
+ refcount_dec(&skb->users);
+ }
+ skb = alloc_skb(len, GFP_ATOMIC);
+ if (unlikely(!skb))
+ return -ENOMEM;
+
+copy_out:
+ __skb_put(skb, len);
+ skb_copy_to_linear_data(skb, rsp, len);
+ skb_reset_network_header(skb);
+ skb_reset_transport_header(skb);
+ ret = chtls_handlers[opcode](cdev, skb);
+
+ if (ret & CPL_RET_BUF_DONE)
+ kfree_skb(skb);
+ return 0;
+}
+
+static void chtls_recv(struct chtls_dev *cdev,
+ struct sk_buff **skbs, const __be64 *rsp)
+{
+ unsigned int opcode = *(u8 *)rsp;
+ struct sk_buff *skb = *skbs;
+ int ret;
+
+ __skb_push(skb, sizeof(struct rss_header));
+ skb_copy_to_linear_data(skb, rsp, sizeof(struct rss_header));
+
+ ret = chtls_handlers[opcode](cdev, skb);
+ if (ret & CPL_RET_BUF_DONE)
+ kfree_skb(skb);
+}
+
+static int chtls_uld_rx_handler(void *handle, const __be64 *rsp,
+ const struct pkt_gl *gl)
+{
+ unsigned int opcode = *(u8 *)rsp;
+ struct chtls_dev *cdev = handle;
+ struct sk_buff *skb;
+
+ if (unlikely(opcode == CPL_RX_PKT)) {
+ if (chtls_recv_packet(cdev, gl, rsp) < 0)
+ goto nomem;
+ return 0;
+ }
+
+ if (!gl)
+ return chtls_recv_rsp(cdev, rsp);
+
+#define RX_PULL_LEN 128
+ skb = cxgb4_pktgl_to_skb(gl, RX_PULL_LEN, RX_PULL_LEN);
+ if (unlikely(!skb))
+ goto nomem;
+ chtls_recv(cdev, &skb, rsp);
+ return 0;
+
+nomem:
+ return -ENOMEM;
+}
+
+static int do_chtls_getsockopt(struct sock *sk, char __user *optval,
+ int __user *optlen)
+{
+ struct tls_crypto_info crypto_info;
+
+ crypto_info.version = TLS_1_2_VERSION;
+ if (copy_to_user(optval, &crypto_info, sizeof(struct tls_crypto_info)))
+ return -EFAULT;
+ return 0;
+}
+
+static int chtls_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ struct tls_context *ctx = tls_get_ctx(sk);
+
+ if (level != SOL_TLS)
+ return ctx->getsockopt(sk, level, optname, optval, optlen);
+
+ return do_chtls_getsockopt(sk, optval, optlen);
+}
+
+static int do_chtls_setsockopt(struct sock *sk, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ struct chtls_sock *csk = rcu_dereference_sk_user_data(sk);
+ struct tls_crypto_info *crypto_info, tmp_crypto_info;
+ int keylen;
+ int rc = 0;
+
+ if (!optval || optlen < sizeof(*crypto_info)) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ rc = copy_from_user(&tmp_crypto_info, optval, sizeof(*crypto_info));
+ if (rc) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ /* check version */
+ if (tmp_crypto_info.version != TLS_1_2_VERSION) {
+ rc = -ENOTSUPP;
+ goto out;
+ }
+
+ crypto_info = (struct tls_crypto_info *)&csk->tlshws.crypto_info;
+
+ switch (tmp_crypto_info.cipher_type) {
+ case TLS_CIPHER_AES_GCM_128: {
+ rc = copy_from_user(crypto_info, optval,
+ sizeof(struct
+ tls12_crypto_info_aes_gcm_128));
+
+ if (rc) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ keylen = TLS_CIPHER_AES_GCM_128_KEY_SIZE;
+ rc = chtls_setkey(csk, keylen, optname);
+ break;
+ }
+ default:
+ rc = -EINVAL;
+ goto out;
+ }
+out:
+ return rc;
+}
+
+static int chtls_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ struct tls_context *ctx = tls_get_ctx(sk);
+
+ if (level != SOL_TLS)
+ return ctx->setsockopt(sk, level, optname, optval, optlen);
+
+ return do_chtls_setsockopt(sk, optname, optval, optlen);
+}
+
+static struct cxgb4_uld_info chtls_uld_info = {
+ .name = DRV_NAME,
+ .nrxq = MAX_ULD_QSETS,
+ .ntxq = MAX_ULD_QSETS,
+ .rxq_size = 1024,
+ .add = chtls_uld_add,
+ .state_change = chtls_uld_state_change,
+ .rx_handler = chtls_uld_rx_handler,
+};
+
+void chtls_install_cpl_ops(struct sock *sk)
+{
+ sk->sk_prot = &chtls_cpl_prot;
+}
+
+static void __init chtls_init_ulp_ops(void)
+{
+ chtls_cpl_prot = tcp_prot;
+ chtls_init_rsk_ops(&chtls_cpl_prot, &chtls_rsk_ops,
+ &tcp_prot, PF_INET);
+ chtls_cpl_prot.close = chtls_close;
+ chtls_cpl_prot.disconnect = chtls_disconnect;
+ chtls_cpl_prot.destroy = chtls_destroy_sock;
+ chtls_cpl_prot.shutdown = chtls_shutdown;
+ chtls_cpl_prot.sendmsg = chtls_sendmsg;
+ chtls_cpl_prot.recvmsg = chtls_recvmsg;
+ chtls_cpl_prot.sendpage = chtls_sendpage;
+ chtls_cpl_prot.setsockopt = chtls_setsockopt;
+ chtls_cpl_prot.getsockopt = chtls_getsockopt;
+}
+
+static int __init chtls_register(void)
+{
+ chtls_init_ulp_ops();
+ register_listen_notifier(&listen_notifier);
+ cxgb4_register_uld(CXGB4_ULD_TLS, &chtls_uld_info);
+ return 0;
+}
+
+static void __exit chtls_unregister(void)
+{
+ unregister_listen_notifier(&listen_notifier);
+ chtls_free_all_uld();
+ cxgb4_unregister_uld(CXGB4_ULD_TLS);
+}
+
+module_init(chtls_register);
+module_exit(chtls_unregister);
+
+MODULE_DESCRIPTION("Chelsio TLS Inline driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Chelsio Communications");
+MODULE_VERSION(DRV_VERSION);
--
1.8.3.1