[PATCH 1/5] cifsd: add server handler and tranport layers

Namjae Jeon
2021-03-22T05:23:35Z

This adds server handler for central processing,
transport layers(tcp, rdma, ipc) and a document describing cifsd
architecture.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
Documentation/filesystems/cifs/cifsd.rst | 180 ++
Documentation/filesystems/cifs/index.rst | 10 +
Documentation/filesystems/index.rst | 2 +-
fs/cifsd/connection.c | 416 +++++
fs/cifsd/connection.h | 212 +++
fs/cifsd/glob.h | 67 +
fs/cifsd/ksmbd_server.h | 285 +++
fs/cifsd/ksmbd_work.c | 93 +
fs/cifsd/ksmbd_work.h | 124 ++
fs/cifsd/server.c | 632 +++++++
fs/cifsd/server.h | 62 +
fs/cifsd/transport_ipc.c | 897 ++++++++++
fs/cifsd/transport_ipc.h | 62 +
fs/cifsd/transport_rdma.c | 2051 ++++++++++++++++++++++
fs/cifsd/transport_rdma.h | 61 +
fs/cifsd/transport_tcp.c | 625 +++++++
fs/cifsd/transport_tcp.h | 13 +
17 files changed, 5791 insertions(+), 1 deletion(-)
create mode 100644 Documentation/filesystems/cifs/cifsd.rst
create mode 100644 Documentation/filesystems/cifs/index.rst
create mode 100644 fs/cifsd/connection.c
create mode 100644 fs/cifsd/connection.h
create mode 100644 fs/cifsd/glob.h
create mode 100644 fs/cifsd/ksmbd_server.h
create mode 100644 fs/cifsd/ksmbd_work.c
create mode 100644 fs/cifsd/ksmbd_work.h
create mode 100644 fs/cifsd/server.c
create mode 100644 fs/cifsd/server.h
create mode 100644 fs/cifsd/transport_ipc.c
create mode 100644 fs/cifsd/transport_ipc.h
create mode 100644 fs/cifsd/transport_rdma.c
create mode 100644 fs/cifsd/transport_rdma.h
create mode 100644 fs/cifsd/transport_tcp.c
create mode 100644 fs/cifsd/transport_tcp.h

diff --git a/Documentation/filesystems/cifs/cifsd.rst b/Documentation/filesystems/cifs/cifsd.rst
new file mode 100644
index 000000000000..7eac7e459c2d
--- /dev/null
+++ b/Documentation/filesystems/cifs/cifsd.rst
@@ -0,0 +1,180 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==========================
+CIFSD - SMB3 Kernel Server
+==========================
+
+CIFSD is a linux kernel server which implements SMB3 protocol in kernel space
+for sharing files over network.
+
+CIFSD architecture
+==================
+
+ |--- ...
+ --------|--- ksmbd/3 - Client 3
+ |-------|--- ksmbd/2 - Client 2
+ | | ____________________________________________________
+ | | |- Client 1 |
+<--- Socket ---|--- ksmbd/1 <<= Authentication : NTLM/NTLM2, Kerberos |
+ | | | | <<= SMB engine : SMB2, SMB2.1, SMB3, SMB3.0.2, |
+ | | | | SMB3.1.1 |
+ | | | |____________________________________________________|
+ | | |
+ | | |--- VFS --- Local Filesystem
+ | |
+KERNEL |--- ksmbd/0(forker kthread)
+---------------||---------------------------------------------------------------
+USER ||
+ || communication using NETLINK
+ || ______________________________________________
+ || | |
+ ksmbd.mountd <<= DCE/RPC(srvsvc, wkssvc, smar, lsarpc) |
+ ^ | <<= configure shares setting, user accounts |
+ | |______________________________________________|
+ |
+ |------ smb.conf(config file)
+ |
+ |------ ksmbdpwd.db(user account/password file)
+ ^
+ ksmbd.adduser ---------------|
+
+The subset of performance related operations belong in kernelspace and
+the other subset which belong to operations which are not really related with
+performance in userspace. So, DCE/RPC management that has historically resulted
+into number of buffer overflow issues and dangerous security bugs and user
+account management are implemented in user space as ksmbd.mountd.
+File operations that are related with performance (open/read/write/close etc.)
+in kernel space (ksmbd). This also allows for easier integration with VFS
+interface for all file operations.
+
+ksmbd (kernel daemon)
+---------------------
+
+When the server daemon is started, It starts up a forker thread
+(ksmbd/interface name) at initialization time and open a dedicated port 445
+for listening to SMB requests. Whenever new clients make request, Forker
+thread will accept the client connection and fork a new thread for dedicated
+communication channel between the client and the server. It allows for parallel
+processing of SMB requests(commands) from clients as well as allowing for new
+clients to make new connections. Each instance is named ksmbd/1~n(port number)
+to indicate connected clients. Depending on the SMB request types, each new
+thread can decide to pass through the commands to the user space (ksmbd.mountd),
+currently DCE/RPC commands are identified to be handled through the user space.
+To further utilize the linux kernel, it has been chosen to process the commands
+as workitems and to be executed in the handlers of the ksmbd-io kworker threads.
+It allows for multiplexing of the handlers as the kernel take care of initiating
+extra worker threads if the load is increased and vice versa, if the load is
+decreased it destroys the extra worker threads. So, after connection is
+established with client. Dedicated ksmbd/1..n(port number) takes complete
+ownership of receiving/parsing of SMB commands. Each received command is worked
+in parallel i.e., There can be multiple clients commands which are worked in
+parallel. After receiving each command a separated kernel workitem is prepared
+for each command which is further queued to be handled by ksmbd-io kworkers.
+So, each SMB workitem is queued to the kworkers. This allows the benefit of load
+sharing to be managed optimally by the default kernel and optimizing client
+performance by handling client commands in parallel.
+
+ksmbd.mountd (user space daemon)
+--------------------------------
+
+ksmbd.mountd is userspace process to, transfer user account and password that
+are registered using ksmbd.adduser(part of utils for user space). Further it
+allows sharing information parameters that parsed from smb.conf to ksmbd in
+kernel. For the execution part it has a daemon which is continuously running
+and connected to the kernel interface using netlink socket, it waits for the
+requests(dcerpc and share/user info). It handles RPC calls (at a minimum few
+dozen) that are most important for file server from NetShareEnum and
+NetServerGetInfo. Complete DCE/RPC response is prepared from the user space
+and passed over to the associated kernel thread for the client.
+
+
+CIFSD Feature Status
+====================
+
+============================== =================================================
+Feature name Status
+============================== =================================================
+Dialects Supported. SMB2.1 SMB3.0, SMB3.1.1 dialects
+ excluding security vulnerable SMB1.
+Auto Negotiation Supported.
+Compound Request Supported.
+Oplock Cache Mechanism Supported.
+SMB2 leases(v1 lease) Supported.
+Directory leases(v2 lease) Planned for future.
+Multi-credits Supported.
+NTLM/NTLMv2 Supported.
+HMAC-SHA256 Signing Supported.
+Secure negotiate Supported.
+Signing Update Supported.
+Pre-authentication integrity Supported.
+SMB3 encryption(CCM, GCM) Supported.
+SMB direct(RDMA) Partial Supported. SMB3 Multi-channel is required
+ to connect to Windows client.
+SMB3 Multi-channel In Progress.
+SMB3.1.1 POSIX extension Supported.
+ACLs Partial Supported. only DACLs available, SACLs is
+ planned for future. ksmbd generate random subauth
+ values(then store it to disk) and use uid/gid
+ get from inode as RID for local domain SID.
+ The current acl implementation is limited to
+ standalone server, not a domain member.
+Kerberos Supported.
+Durable handle v1,v2 Planned for future.
+Persistent handle Planned for future.
+SMB2 notify Planned for future.
+Sparse file support Supported.
+DCE/RPC support Partial Supported. a few calls(NetShareEnumAll,
+ NetServerGetInfo, SAMR, LSARPC) that needed as
+ file server via netlink interface from
+ ksmbd.mountd.
+============================== =================================================
+
+
+How to run
+==========
+
+1. Download ksmbd-tools and compile them.
+ - https://github.com/cifsd-team/ksmbd-tools
+
+2. Create user/password for SMB share.
+
+ # mkdir /etc/ksmbd/
+ # ksmbd.adduser -a <Enter USERNAME for SMB share access>
+
+3. Create /etc/ksmbd/smb.conf file, add SMB share in smb.conf file
+ - Refer smb.conf.example and Documentation/configuration.txt
+ in ksmbd-tools
+
+4. Insert ksmbd.ko module
+
+ # insmod ksmbd.ko
+
+5. Start ksmbd user space daemon
+ # ksmbd.mountd
+
+6. Access share from Windows or Linux using CIFS
+
+Shutdown CIFSD
+==============
+
+1. kill user and kernel space daemon
+ # sudo ksmbd.control -s
+
+How to turn debug print on
+==========================
+
+Each layer
+/sys/class/ksmbd-control/debug
+
+1. Enable all component prints
+ # sudo ksmbd.control -d "all"
+
+2. Enable one of components(smb, auth, vfs, oplock, ipc, conn, rdma)
+ # sudo ksmbd.control -d "smb"
+
+3. Show what prints are enable.
+ # cat/sys/class/ksmbd-control/debug
+ [smb] auth vfs oplock ipc conn [rdma]
+
+4. Disable prints:
+ If you try the selected component once more, It is disabled without brackets.
diff --git a/Documentation/filesystems/cifs/index.rst b/Documentation/filesystems/cifs/index.rst
new file mode 100644
index 000000000000..e762586b5dc7
--- /dev/null
+++ b/Documentation/filesystems/cifs/index.rst
@@ -0,0 +1,10 @@
+===============================
+CIFS
+===============================
+
+
+.. toctree::
+ :maxdepth: 1
+
+ cifsd
+ cifsroot
diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst
index 1f76b1cb3348..085702b5dbba 100644
--- a/Documentation/filesystems/index.rst
+++ b/Documentation/filesystems/index.rst
@@ -71,7 +71,7 @@ Documentation for filesystem implementations.
befs
bfs
btrfs
- cifs/cifsroot
+ cifs/index
ceph
coda
configfs
diff --git a/fs/cifsd/connection.c b/fs/cifsd/connection.c
new file mode 100644
index 000000000000..d27553dee2ad
--- /dev/null
+++ b/fs/cifsd/connection.c
@@ -0,0 +1,416 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Namjae Jeon <namjae.jeon@protocolfreedom.org>
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/mutex.h>
+#include <linux/freezer.h>
+#include <linux/module.h>
+
+#include "server.h"
+#include "buffer_pool.h"
+#include "smb_common.h"
+#include "mgmt/ksmbd_ida.h"
+#include "connection.h"
+#include "transport_tcp.h"
+#include "transport_rdma.h"
+
+static DEFINE_MUTEX(init_lock);
+
+static struct ksmbd_conn_ops default_conn_ops;
+
+static LIST_HEAD(conn_list);
+static DEFINE_RWLOCK(conn_list_lock);
+
+/**
+ * ksmbd_conn_free() - free resources of the connection instance
+ *
+ * @conn: connection instance to be cleand up
+ *
+ * During the thread termination, the corresponding conn instance
+ * resources(sock/memory) are released and finally the conn object is freed.
+ */
+void ksmbd_conn_free(struct ksmbd_conn *conn)
+{
+ write_lock(&conn_list_lock);
+ list_del(&conn->conns_list);
+ write_unlock(&conn_list_lock);
+
+ ksmbd_free_request(conn->request_buf);
+ ksmbd_ida_free(conn->async_ida);
+ kfree(conn->preauth_info);
+ kfree(conn);
+}
+
+/**
+ * ksmbd_conn_alloc() - initialize a new connection instance
+ *
+ * Return: ksmbd_conn struct on success, otherwise NULL
+ */
+struct ksmbd_conn *ksmbd_conn_alloc(void)
+{
+ struct ksmbd_conn *conn;
+
+ conn = kzalloc(sizeof(struct ksmbd_conn), GFP_KERNEL);
+ if (!conn)
+ return NULL;
+
+ conn->need_neg = true;
+ conn->status = KSMBD_SESS_NEW;
+ conn->local_nls = load_nls("utf8");
+ if (!conn->local_nls)
+ conn->local_nls = load_nls_default();
+ atomic_set(&conn->req_running, 0);
+ atomic_set(&conn->r_count, 0);
+ init_waitqueue_head(&conn->req_running_q);
+ INIT_LIST_HEAD(&conn->conns_list);
+ INIT_LIST_HEAD(&conn->sessions);
+ INIT_LIST_HEAD(&conn->requests);
+ INIT_LIST_HEAD(&conn->async_requests);
+ spin_lock_init(&conn->request_lock);
+ spin_lock_init(&conn->credits_lock);
+ conn->async_ida = ksmbd_ida_alloc();
+
+ write_lock(&conn_list_lock);
+ list_add(&conn->conns_list, &conn_list);
+ write_unlock(&conn_list_lock);
+ return conn;
+}
+
+bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
+{
+ struct ksmbd_conn *t;
+ bool ret = false;
+
+ read_lock(&conn_list_lock);
+ list_for_each_entry(t, &conn_list, conns_list) {
+ if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
+ continue;
+
+ ret = true;
+ break;
+ }
+ read_unlock(&conn_list_lock);
+ return ret;
+}
+
+void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
+{
+ struct ksmbd_conn *conn = work->conn;
+ struct list_head *requests_queue = NULL;
+
+ if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE) {
+ requests_queue = &conn->requests;
+ work->syncronous = true;
+ }
+
+ if (requests_queue) {
+ atomic_inc(&conn->req_running);
+ spin_lock(&conn->request_lock);
+ list_add_tail(&work->request_entry, requests_queue);
+ spin_unlock(&conn->request_lock);
+ }
+}
+
+int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
+{
+ struct ksmbd_conn *conn = work->conn;
+ int ret = 1;
+
+ if (list_empty(&work->request_entry) &&
+ list_empty(&work->async_request_entry))
+ return 0;
+
+ atomic_dec(&conn->req_running);
+ spin_lock(&conn->request_lock);
+ if (!work->multiRsp) {
+ list_del_init(&work->request_entry);
+ if (work->syncronous == false)
+ list_del_init(&work->async_request_entry);
+ ret = 0;
+ }
+ spin_unlock(&conn->request_lock);
+
+ wake_up_all(&conn->req_running_q);
+ return ret;
+}
+
+static void ksmbd_conn_lock(struct ksmbd_conn *conn)
+{
+ mutex_lock(&conn->srv_mutex);
+}
+
+static void ksmbd_conn_unlock(struct ksmbd_conn *conn)
+{
+ mutex_unlock(&conn->srv_mutex);
+}
+
+void ksmbd_conn_wait_idle(struct ksmbd_conn *conn)
+{
+ wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
+}
+
+int ksmbd_conn_write(struct ksmbd_work *work)
+{
+ struct ksmbd_conn *conn = work->conn;
+ struct smb_hdr *rsp_hdr = RESPONSE_BUF(work);
+ size_t len = 0;
+ int sent;
+ struct kvec iov[3];
+ int iov_idx = 0;
+
+ ksmbd_conn_try_dequeue_request(work);
+ if (!rsp_hdr) {
+ ksmbd_err("NULL response header\n");
+ return -EINVAL;
+ }
+
+ if (HAS_TRANSFORM_BUF(work)) {
+ iov[iov_idx] = (struct kvec) { work->tr_buf,
+ sizeof(struct smb2_transform_hdr) };
+ len += iov[iov_idx++].iov_len;
+ }
+
+ if (HAS_AUX_PAYLOAD(work)) {
+ iov[iov_idx] = (struct kvec) { rsp_hdr, RESP_HDR_SIZE(work) };
+ len += iov[iov_idx++].iov_len;
+ iov[iov_idx] = (struct kvec) { AUX_PAYLOAD(work),
+ AUX_PAYLOAD_SIZE(work) };
+ len += iov[iov_idx++].iov_len;
+ } else {
+ if (HAS_TRANSFORM_BUF(work))
+ iov[iov_idx].iov_len = RESP_HDR_SIZE(work);
+ else
+ iov[iov_idx].iov_len = get_rfc1002_len(rsp_hdr) + 4;
+ iov[iov_idx].iov_base = rsp_hdr;
+ len += iov[iov_idx++].iov_len;
+ }
+
+ ksmbd_conn_lock(conn);
+ sent = conn->transport->ops->writev(conn->transport, &iov[0],
+ iov_idx, len,
+ work->need_invalidate_rkey,
+ work->remote_key);
+ ksmbd_conn_unlock(conn);
+
+ if (sent < 0) {
+ ksmbd_err("Failed to send message: %d\n", sent);
+ return sent;
+ }
+
+ return 0;
+}
+
+int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
+ void *buf, unsigned int buflen,
+ u32 remote_key, u64 remote_offset,
+ u32 remote_len)
+{
+ int ret = -EINVAL;
+
+ if (conn->transport->ops->rdma_read)
+ ret = conn->transport->ops->rdma_read(conn->transport,
+ buf, buflen,
+ remote_key, remote_offset,
+ remote_len);
+ return ret;
+}
+
+int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
+ void *buf, unsigned int buflen,
+ u32 remote_key, u64 remote_offset,
+ u32 remote_len)
+{
+ int ret = -EINVAL;
+
+ if (conn->transport->ops->rdma_write)
+ ret = conn->transport->ops->rdma_write(conn->transport,
+ buf, buflen,
+ remote_key, remote_offset,
+ remote_len);
+ return ret;
+}
+
+bool ksmbd_conn_alive(struct ksmbd_conn *conn)
+{
+ if (!ksmbd_server_running())
+ return false;
+
+ if (conn->status == KSMBD_SESS_EXITING)
+ return false;
+
+ if (kthread_should_stop())
+ return false;
+
+ if (atomic_read(&conn->stats.open_files_count) > 0)
+ return true;
+
+ /*
+ * Stop current session if the time that get last request from client
+ * is bigger than deadtime user configured and openning file count is
+ * zero.
+ */
+ if (server_conf.deadtime > 0 &&
+ time_after(jiffies, conn->last_active + server_conf.deadtime)) {
+ ksmbd_debug(CONN, "No response from client in %lu minutes\n",
+ server_conf.deadtime / SMB_ECHO_INTERVAL);
+ return false;
+ }
+ return true;
+}
+
+/**
+ * ksmbd_conn_handler_loop() - session thread to listen on new smb requests
+ * @p: connection instance
+ *
+ * One thread each per connection
+ *
+ * Return: 0 on success
+ */
+int ksmbd_conn_handler_loop(void *p)
+{
+ struct ksmbd_conn *conn = (struct ksmbd_conn *)p;
+ struct ksmbd_transport *t = conn->transport;
+ unsigned int pdu_size;
+ char hdr_buf[4] = {0,};
+ int size;
+
+ mutex_init(&conn->srv_mutex);
+ __module_get(THIS_MODULE);
+
+ if (t->ops->prepare && t->ops->prepare(t))
+ goto out;
+
+ conn->last_active = jiffies;
+ while (ksmbd_conn_alive(conn)) {
+ if (try_to_freeze())
+ continue;
+
+ ksmbd_free_request(conn->request_buf);
+ conn->request_buf = NULL;
+
+ size = t->ops->read(t, hdr_buf, sizeof(hdr_buf));
+ if (size != sizeof(hdr_buf))
+ break;
+
+ pdu_size = get_rfc1002_len(hdr_buf);
+ ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
+
+ /* make sure we have enough to get to SMB header end */
+ if (!ksmbd_pdu_size_has_room(pdu_size)) {
+ ksmbd_debug(CONN, "SMB request too short (%u bytes)\n",
+ pdu_size);
+ continue;
+ }
+
+ /* 4 for rfc1002 length field */
+ size = pdu_size + 4;
+ conn->request_buf = ksmbd_alloc_request(size);
+ if (!conn->request_buf)
+ continue;
+
+ memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
+ if (!ksmbd_smb_request(conn))
+ break;
+
+ /*
+ * We already read 4 bytes to find out PDU size, now
+ * read in PDU
+ */
+ size = t->ops->read(t, conn->request_buf + 4, pdu_size);
+ if (size < 0) {
+ ksmbd_err("sock_read failed: %d\n", size);
+ break;
+ }
+
+ if (size != pdu_size) {
+ ksmbd_err("PDU error. Read: %d, Expected: %d\n",
+ size,
+ pdu_size);
+ continue;
+ }
+
+ if (!default_conn_ops.process_fn) {
+ ksmbd_err("No connection request callback\n");
+ break;
+ }
+
+ if (default_conn_ops.process_fn(conn)) {
+ ksmbd_err("Cannot handle request\n");
+ break;
+ }
+ }
+
+out:
+ /* Wait till all reference dropped to the Server object*/
+ while (atomic_read(&conn->r_count) > 0)
+ schedule_timeout(HZ);
+
+ unload_nls(conn->local_nls);
+ if (default_conn_ops.terminate_fn)
+ default_conn_ops.terminate_fn(conn);
+ t->ops->disconnect(t);
+ module_put(THIS_MODULE);
+ return 0;
+}
+
+void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
+{
+ default_conn_ops.process_fn = ops->process_fn;
+ default_conn_ops.terminate_fn = ops->terminate_fn;
+}
+
+int ksmbd_conn_transport_init(void)
+{
+ int ret;
+
+ mutex_lock(&init_lock);
+ ret = ksmbd_tcp_init();
+ if (ret) {
+ pr_err("Failed to init TCP subsystem: %d\n", ret);
+ goto out;
+ }
+
+ ret = ksmbd_rdma_init();
+ if (ret) {
+ pr_err("Failed to init KSMBD subsystem: %d\n", ret);
+ goto out;
+ }
+out:
+ mutex_unlock(&init_lock);
+ return ret;
+}
+
+static void stop_sessions(void)
+{
+ struct ksmbd_conn *conn;
+
+again:
+ read_lock(&conn_list_lock);
+ list_for_each_entry(conn, &conn_list, conns_list) {
+ struct task_struct *task;
+
+ task = conn->transport->handler;
+ if (task)
+ ksmbd_debug(CONN, "Stop session handler %s/%d\n",
+ task->comm,
+ task_pid_nr(task));
+ conn->status = KSMBD_SESS_EXITING;
+ }
+ read_unlock(&conn_list_lock);
+
+ if (!list_empty(&conn_list)) {
+ schedule_timeout_interruptible(HZ/10); /* 100ms */
+ goto again;
+ }
+}
+
+void ksmbd_conn_transport_destroy(void)
+{
+ mutex_lock(&init_lock);
+ ksmbd_tcp_destroy();
+ ksmbd_rdma_destroy();
+ stop_sessions();
+ mutex_unlock(&init_lock);
+}
diff --git a/fs/cifsd/connection.h b/fs/cifsd/connection.h
new file mode 100644
index 000000000000..179fb9278999
--- /dev/null
+++ b/fs/cifsd/connection.h
@@ -0,0 +1,212 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#ifndef __KSMBD_CONNECTION_H__
+#define __KSMBD_CONNECTION_H__
+
+#include <linux/list.h>
+#include <linux/ip.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+#include <net/inet_connection_sock.h>
+#include <net/request_sock.h>
+#include <linux/kthread.h>
+#include <linux/nls.h>
+
+#include "smb_common.h"
+#include "ksmbd_work.h"
+
+#define KSMBD_SOCKET_BACKLOG 16
+
+/*
+ * WARNING
+ *
+ * This is nothing but a HACK. Session status should move to channel
+ * or to session. As of now we have 1 tcp_conn : 1 ksmbd_session, but
+ * we need to change it to 1 tcp_conn : N ksmbd_sessions.
+ */
+enum {
+ KSMBD_SESS_NEW = 0,
+ KSMBD_SESS_GOOD,
+ KSMBD_SESS_EXITING,
+ KSMBD_SESS_NEED_RECONNECT,
+ KSMBD_SESS_NEED_NEGOTIATE
+};
+
+struct ksmbd_stats {
+ atomic_t open_files_count;
+ atomic64_t request_served;
+};
+
+struct ksmbd_transport;
+
+struct ksmbd_conn {
+ struct smb_version_values *vals;
+ struct smb_version_ops *ops;
+ struct smb_version_cmds *cmds;
+ unsigned int max_cmds;
+ struct mutex srv_mutex;
+ int status;
+ unsigned int cli_cap;
+ char *request_buf;
+ struct ksmbd_transport *transport;
+ struct nls_table *local_nls;
+ struct list_head conns_list;
+ /* smb session 1 per user */
+ struct list_head sessions;
+ unsigned long last_active;
+ /* How many request are running currently */
+ atomic_t req_running;
+ /* References which are made for this Server object*/
+ atomic_t r_count;
+ unsigned short total_credits;
+ unsigned short max_credits;
+ spinlock_t credits_lock;
+ wait_queue_head_t req_running_q;
+ /* Lock to protect requests list*/
+ spinlock_t request_lock;
+ struct list_head requests;
+ struct list_head async_requests;
+ int connection_type;
+ struct ksmbd_stats stats;
+ char ClientGUID[SMB2_CLIENT_GUID_SIZE];
+ union {
+ /* pending trans request table */
+ struct trans_state *recent_trans;
+ /* Used by ntlmssp */
+ char *ntlmssp_cryptkey;
+ };
+
+ struct preauth_integrity_info *preauth_info;
+
+ bool need_neg;
+ unsigned int auth_mechs;
+ unsigned int preferred_auth_mech;
+ bool sign;
+ bool use_spnego:1;
+ __u16 cli_sec_mode;
+ __u16 srv_sec_mode;
+ /* dialect index that server chose */
+ __u16 dialect;
+
+ char *mechToken;
+
+ struct ksmbd_conn_ops *conn_ops;
+
+ /* Preauth Session Table */
+ struct list_head preauth_sess_table;
+
+ struct sockaddr_storage peer_addr;
+
+ /* Identifier for async message */
+ struct ksmbd_ida *async_ida;
+
+ __le16 cipher_type;
+ __le16 compress_algorithm;
+ bool posix_ext_supported;
+};
+
+struct ksmbd_conn_ops {
+ int (*process_fn)(struct ksmbd_conn *conn);
+ int (*terminate_fn)(struct ksmbd_conn *conn);
+};
+
+struct ksmbd_transport_ops {
+ int (*prepare)(struct ksmbd_transport *t);
+ void (*disconnect)(struct ksmbd_transport *t);
+ int (*read)(struct ksmbd_transport *t,
+ char *buf, unsigned int size);
+ int (*writev)(struct ksmbd_transport *t,
+ struct kvec *iovs, int niov, int size,
+ bool need_invalidate_rkey, unsigned int remote_key);
+ int (*rdma_read)(struct ksmbd_transport *t,
+ void *buf, unsigned int len, u32 remote_key,
+ u64 remote_offset, u32 remote_len);
+ int (*rdma_write)(struct ksmbd_transport *t,
+ void *buf, unsigned int len, u32 remote_key,
+ u64 remote_offset, u32 remote_len);
+};
+
+struct ksmbd_transport {
+ struct ksmbd_conn *conn;
+ struct ksmbd_transport_ops *ops;
+ struct task_struct *handler;
+};
+
+#define KSMBD_TCP_RECV_TIMEOUT (7 * HZ)
+#define KSMBD_TCP_SEND_TIMEOUT (5 * HZ)
+#define KSMBD_TCP_PEER_SOCKADDR(c) ((struct sockaddr *)&((c)->peer_addr))
+
+bool ksmbd_conn_alive(struct ksmbd_conn *conn);
+void ksmbd_conn_wait_idle(struct ksmbd_conn *conn);
+
+struct ksmbd_conn *ksmbd_conn_alloc(void);
+void ksmbd_conn_free(struct ksmbd_conn *conn);
+bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c);
+int ksmbd_conn_write(struct ksmbd_work *work);
+int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
+ void *buf, unsigned int buflen,
+ u32 remote_key, u64 remote_offset,
+ u32 remote_len);
+int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
+ void *buf, unsigned int buflen,
+ u32 remote_key, u64 remote_offset,
+ u32 remote_len);
+
+void ksmbd_conn_enqueue_request(struct ksmbd_work *work);
+int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work);
+void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops);
+
+int ksmbd_conn_handler_loop(void *p);
+
+int ksmbd_conn_transport_init(void);
+void ksmbd_conn_transport_destroy(void);
+
+/*
+ * WARNING
+ *
+ * This is a hack. We will move status to a proper place once we land
+ * a multi-sessions support.
+ */
+static inline bool ksmbd_conn_good(struct ksmbd_work *work)
+{
+ return work->conn->status == KSMBD_SESS_GOOD;
+}
+
+static inline bool ksmbd_conn_need_negotiate(struct ksmbd_work *work)
+{
+ return work->conn->status == KSMBD_SESS_NEED_NEGOTIATE;
+}
+
+static inline bool ksmbd_conn_need_reconnect(struct ksmbd_work *work)
+{
+ return work->conn->status == KSMBD_SESS_NEED_RECONNECT;
+}
+
+static inline bool ksmbd_conn_exiting(struct ksmbd_work *work)
+{
+ return work->conn->status == KSMBD_SESS_EXITING;
+}
+
+static inline void ksmbd_conn_set_good(struct ksmbd_work *work)
+{
+ work->conn->status = KSMBD_SESS_GOOD;
+}
+
+static inline void ksmbd_conn_set_need_negotiate(struct ksmbd_work *work)
+{
+ work->conn->status = KSMBD_SESS_NEED_NEGOTIATE;
+}
+
+static inline void ksmbd_conn_set_need_reconnect(struct ksmbd_work *work)
+{
+ work->conn->status = KSMBD_SESS_NEED_RECONNECT;
+}
+
+static inline void ksmbd_conn_set_exiting(struct ksmbd_work *work)
+{
+ work->conn->status = KSMBD_SESS_EXITING;
+}
+#endif /* __CONNECTION_H__ */
diff --git a/fs/cifsd/glob.h b/fs/cifsd/glob.h
new file mode 100644
index 000000000000..2dc3f603e837
--- /dev/null
+++ b/fs/cifsd/glob.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#ifndef __KSMBD_GLOB_H
+#define __KSMBD_GLOB_H
+
+#include <linux/ctype.h>
+#include <linux/version.h>
+
+#include "unicode.h"
+#include "vfs_cache.h"
+#include "smberr.h"
+
+#define KSMBD_VERSION "3.1.9"
+
+/* @FIXME clean up this code */
+
+extern int ksmbd_debug_types;
+extern int ksmbd_caseless_search;
+
+#define DATA_STREAM 1
+#define DIR_STREAM 2
+
+#define KSMBD_DEBUG_SMB (1 << 0)
+#define KSMBD_DEBUG_AUTH (1 << 1)
+#define KSMBD_DEBUG_VFS (1 << 2)
+#define KSMBD_DEBUG_OPLOCK (1 << 3)
+#define KSMBD_DEBUG_IPC (1 << 4)
+#define KSMBD_DEBUG_CONN (1 << 5)
+#define KSMBD_DEBUG_RDMA (1 << 6)
+#define KSMBD_DEBUG_ALL (KSMBD_DEBUG_SMB | KSMBD_DEBUG_AUTH | \
+ KSMBD_DEBUG_VFS | KSMBD_DEBUG_OPLOCK | \
+ KSMBD_DEBUG_IPC | KSMBD_DEBUG_CONN | \
+ KSMBD_DEBUG_RDMA)
+
+#ifndef ksmbd_pr_fmt
+#ifdef SUBMOD_NAME
+#define ksmbd_pr_fmt(fmt) "ksmbd: " SUBMOD_NAME ": " fmt
+#else
+#define ksmbd_pr_fmt(fmt) "ksmbd: " fmt
+#endif
+#endif
+
+#define ksmbd_debug(type, fmt, ...) \
+ do { \
+ if (ksmbd_debug_types & KSMBD_DEBUG_##type) \
+ pr_info(ksmbd_pr_fmt("%s:%d: " fmt), \
+ __func__, \
+ __LINE__, \
+ ##__VA_ARGS__); \
+ } while (0)
+
+#define ksmbd_info(fmt, ...) \
+ pr_info(ksmbd_pr_fmt(fmt), ##__VA_ARGS__)
+
+#define ksmbd_err(fmt, ...) \
+ pr_err(ksmbd_pr_fmt("%s:%d: " fmt), \
+ __func__, \
+ __LINE__, \
+ ##__VA_ARGS__)
+
+#define UNICODE_LEN(x) ((x) * 2)
+
+#endif /* __KSMBD_GLOB_H */
diff --git a/fs/cifsd/ksmbd_server.h b/fs/cifsd/ksmbd_server.h
new file mode 100644
index 000000000000..01eaf9ec4fde
--- /dev/null
+++ b/fs/cifsd/ksmbd_server.h
@@ -0,0 +1,285 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ *
+ * linux-ksmbd-devel@lists.sourceforge.net
+ */
+
+#ifndef _LINUX_KSMBD_SERVER_H
+#define _LINUX_KSMBD_SERVER_H
+
+#include <linux/types.h>
+
+#define KSMBD_GENL_NAME "SMBD_GENL"
+#define KSMBD_GENL_VERSION 0x01
+
+#ifndef ____ksmbd_align
+#define ____ksmbd_align __aligned(4)
+#endif
+
+#define KSMBD_REQ_MAX_ACCOUNT_NAME_SZ 48
+#define KSMBD_REQ_MAX_HASH_SZ 18
+#define KSMBD_REQ_MAX_SHARE_NAME 64
+
+struct ksmbd_heartbeat {
+ __u32 handle;
+};
+
+/*
+ * Global config flags.
+ */
+#define KSMBD_GLOBAL_FLAG_INVALID (0)
+#define KSMBD_GLOBAL_FLAG_SMB2_LEASES (1 << 0)
+#define KSMBD_GLOBAL_FLAG_CACHE_TBUF (1 << 1)
+#define KSMBD_GLOBAL_FLAG_CACHE_RBUF (1 << 2)
+#define KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION (1 << 3)
+#define KSMBD_GLOBAL_FLAG_DURABLE_HANDLE (1 << 4)
+
+struct ksmbd_startup_request {
+ __u32 flags;
+ __s32 signing;
+ __s8 min_prot[16];
+ __s8 max_prot[16];
+ __s8 netbios_name[16];
+ __s8 work_group[64];
+ __s8 server_string[64];
+ __u16 tcp_port;
+ __u16 ipc_timeout;
+ __u32 deadtime;
+ __u32 file_max;
+ __u32 smb2_max_write;
+ __u32 smb2_max_read;
+ __u32 smb2_max_trans;
+ __u32 share_fake_fscaps;
+ __u32 sub_auth[3];
+ __u32 ifc_list_sz;
+ __s8 ____payload[0];
+} ____ksmbd_align;
+
+#define KSMBD_STARTUP_CONFIG_INTERFACES(s) ((s)->____payload)
+
+struct ksmbd_shutdown_request {
+ __s32 reserved;
+} ____ksmbd_align;
+
+struct ksmbd_login_request {
+ __u32 handle;
+ __s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
+} ____ksmbd_align;
+
+struct ksmbd_login_response {
+ __u32 handle;
+ __u32 gid;
+ __u32 uid;
+ __s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
+ __u16 status;
+ __u16 hash_sz;
+ __s8 hash[KSMBD_REQ_MAX_HASH_SZ];
+} ____ksmbd_align;
+
+struct ksmbd_share_config_request {
+ __u32 handle;
+ __s8 share_name[KSMBD_REQ_MAX_SHARE_NAME];
+} ____ksmbd_align;
+
+struct ksmbd_share_config_response {
+ __u32 handle;
+ __u32 flags;
+ __u16 create_mask;
+ __u16 directory_mask;
+ __u16 force_create_mode;
+ __u16 force_directory_mode;
+ __u16 force_uid;
+ __u16 force_gid;
+ __u32 veto_list_sz;
+ __s8 ____payload[0];
+} ____ksmbd_align;
+
+#define KSMBD_SHARE_CONFIG_VETO_LIST(s) ((s)->____payload)
+#define KSMBD_SHARE_CONFIG_PATH(s) \
+ ({ \
+ char *p = (s)->____payload; \
+ if ((s)->veto_list_sz) \
+ p += (s)->veto_list_sz + 1; \
+ p; \
+ })
+
+struct ksmbd_tree_connect_request {
+ __u32 handle;
+ __u16 account_flags;
+ __u16 flags;
+ __u64 session_id;
+ __u64 connect_id;
+ __s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
+ __s8 share[KSMBD_REQ_MAX_SHARE_NAME];
+ __s8 peer_addr[64];
+} ____ksmbd_align;
+
+struct ksmbd_tree_connect_response {
+ __u32 handle;
+ __u16 status;
+ __u16 connection_flags;
+} ____ksmbd_align;
+
+struct ksmbd_tree_disconnect_request {
+ __u64 session_id;
+ __u64 connect_id;
+} ____ksmbd_align;
+
+struct ksmbd_logout_request {
+ __s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
+} ____ksmbd_align;
+
+struct ksmbd_rpc_command {
+ __u32 handle;
+ __u32 flags;
+ __u32 payload_sz;
+ __u8 payload[0];
+} ____ksmbd_align;
+
+struct ksmbd_spnego_authen_request {
+ __u32 handle;
+ __u16 spnego_blob_len;
+ __u8 spnego_blob[0];
+} ____ksmbd_align;
+
+struct ksmbd_spnego_authen_response {
+ __u32 handle;
+ struct ksmbd_login_response login_response;
+ __u16 session_key_len;
+ __u16 spnego_blob_len;
+ __u8 payload[0]; /* session key + AP_REP */
+} ____ksmbd_align;
+
+/*
+ * This also used as NETLINK attribute type value.
+ *
+ * NOTE:
+ * Response message type value should be equal to
+ * request message type value + 1.
+ */
+enum ksmbd_event {
+ KSMBD_EVENT_UNSPEC = 0,
+ KSMBD_EVENT_HEARTBEAT_REQUEST,
+
+ KSMBD_EVENT_STARTING_UP,
+ KSMBD_EVENT_SHUTTING_DOWN,
+
+ KSMBD_EVENT_LOGIN_REQUEST,
+ KSMBD_EVENT_LOGIN_RESPONSE = 5,
+
+ KSMBD_EVENT_SHARE_CONFIG_REQUEST,
+ KSMBD_EVENT_SHARE_CONFIG_RESPONSE,
+
+ KSMBD_EVENT_TREE_CONNECT_REQUEST,
+ KSMBD_EVENT_TREE_CONNECT_RESPONSE,
+
+ KSMBD_EVENT_TREE_DISCONNECT_REQUEST = 10,
+
+ KSMBD_EVENT_LOGOUT_REQUEST,
+
+ KSMBD_EVENT_RPC_REQUEST,
+ KSMBD_EVENT_RPC_RESPONSE,
+
+ KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST,
+ KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE = 15,
+
+ KSMBD_EVENT_MAX
+};
+
+enum KSMBD_TREE_CONN_STATUS {
+ KSMBD_TREE_CONN_STATUS_OK = 0,
+ KSMBD_TREE_CONN_STATUS_NOMEM,
+ KSMBD_TREE_CONN_STATUS_NO_SHARE,
+ KSMBD_TREE_CONN_STATUS_NO_USER,
+ KSMBD_TREE_CONN_STATUS_INVALID_USER,
+ KSMBD_TREE_CONN_STATUS_HOST_DENIED = 5,
+ KSMBD_TREE_CONN_STATUS_CONN_EXIST,
+ KSMBD_TREE_CONN_STATUS_TOO_MANY_CONNS,
+ KSMBD_TREE_CONN_STATUS_TOO_MANY_SESSIONS,
+ KSMBD_TREE_CONN_STATUS_ERROR,
+};
+
+/*
+ * User config flags.
+ */
+#define KSMBD_USER_FLAG_INVALID (0)
+#define KSMBD_USER_FLAG_OK (1 << 0)
+#define KSMBD_USER_FLAG_BAD_PASSWORD (1 << 1)
+#define KSMBD_USER_FLAG_BAD_UID (1 << 2)
+#define KSMBD_USER_FLAG_BAD_USER (1 << 3)
+#define KSMBD_USER_FLAG_GUEST_ACCOUNT (1 << 4)
+
+/*
+ * Share config flags.
+ */
+#define KSMBD_SHARE_FLAG_INVALID (0)
+#define KSMBD_SHARE_FLAG_AVAILABLE (1 << 0)
+#define KSMBD_SHARE_FLAG_BROWSEABLE (1 << 1)
+#define KSMBD_SHARE_FLAG_WRITEABLE (1 << 2)
+#define KSMBD_SHARE_FLAG_READONLY (1 << 3)
+#define KSMBD_SHARE_FLAG_GUEST_OK (1 << 4)
+#define KSMBD_SHARE_FLAG_GUEST_ONLY (1 << 5)
+#define KSMBD_SHARE_FLAG_STORE_DOS_ATTRS (1 << 6)
+#define KSMBD_SHARE_FLAG_OPLOCKS (1 << 7)
+#define KSMBD_SHARE_FLAG_PIPE (1 << 8)
+#define KSMBD_SHARE_FLAG_HIDE_DOT_FILES (1 << 9)
+#define KSMBD_SHARE_FLAG_INHERIT_SMACK (1 << 10)
+#define KSMBD_SHARE_FLAG_INHERIT_OWNER (1 << 11)
+#define KSMBD_SHARE_FLAG_STREAMS (1 << 12)
+#define KSMBD_SHARE_FLAG_FOLLOW_SYMLINKS (1 << 13)
+#define KSMBD_SHARE_FLAG_ACL_XATTR (1 << 14)
+
+/*
+ * Tree connect request flags.
+ */
+#define KSMBD_TREE_CONN_FLAG_REQUEST_SMB1 (0)
+#define KSMBD_TREE_CONN_FLAG_REQUEST_IPV6 (1 << 0)
+#define KSMBD_TREE_CONN_FLAG_REQUEST_SMB2 (1 << 1)
+
+/*
+ * Tree connect flags.
+ */
+#define KSMBD_TREE_CONN_FLAG_GUEST_ACCOUNT (1 << 0)
+#define KSMBD_TREE_CONN_FLAG_READ_ONLY (1 << 1)
+#define KSMBD_TREE_CONN_FLAG_WRITABLE (1 << 2)
+#define KSMBD_TREE_CONN_FLAG_ADMIN_ACCOUNT (1 << 3)
+
+/*
+ * RPC over IPC.
+ */
+#define KSMBD_RPC_METHOD_RETURN (1 << 0)
+#define KSMBD_RPC_SRVSVC_METHOD_INVOKE (1 << 1)
+#define KSMBD_RPC_SRVSVC_METHOD_RETURN ((1 << 1) | KSMBD_RPC_METHOD_RETURN)
+#define KSMBD_RPC_WKSSVC_METHOD_INVOKE (1 << 2)
+#define KSMBD_RPC_WKSSVC_METHOD_RETURN ((1 << 2) | KSMBD_RPC_METHOD_RETURN)
+#define KSMBD_RPC_IOCTL_METHOD ((1 << 3) | KSMBD_RPC_METHOD_RETURN)
+#define KSMBD_RPC_OPEN_METHOD (1 << 4)
+#define KSMBD_RPC_WRITE_METHOD (1 << 5)
+#define KSMBD_RPC_READ_METHOD ((1 << 6) | KSMBD_RPC_METHOD_RETURN)
+#define KSMBD_RPC_CLOSE_METHOD (1 << 7)
+#define KSMBD_RPC_RAP_METHOD ((1 << 8) | KSMBD_RPC_METHOD_RETURN)
+#define KSMBD_RPC_RESTRICTED_CONTEXT (1 << 9)
+#define KSMBD_RPC_SAMR_METHOD_INVOKE (1 << 10)
+#define KSMBD_RPC_SAMR_METHOD_RETURN ((1 << 10) | KSMBD_RPC_METHOD_RETURN)
+#define KSMBD_RPC_LSARPC_METHOD_INVOKE (1 << 11)
+#define KSMBD_RPC_LSARPC_METHOD_RETURN ((1 << 11) | KSMBD_RPC_METHOD_RETURN)
+
+#define KSMBD_RPC_OK 0
+#define KSMBD_RPC_EBAD_FUNC 0x00000001
+#define KSMBD_RPC_EACCESS_DENIED 0x00000005
+#define KSMBD_RPC_EBAD_FID 0x00000006
+#define KSMBD_RPC_ENOMEM 0x00000008
+#define KSMBD_RPC_EBAD_DATA 0x0000000D
+#define KSMBD_RPC_ENOTIMPLEMENTED 0x00000040
+#define KSMBD_RPC_EINVALID_PARAMETER 0x00000057
+#define KSMBD_RPC_EMORE_DATA 0x000000EA
+#define KSMBD_RPC_EINVALID_LEVEL 0x0000007C
+#define KSMBD_RPC_SOME_NOT_MAPPED 0x00000107
+
+#define KSMBD_CONFIG_OPT_DISABLED 0
+#define KSMBD_CONFIG_OPT_ENABLED 1
+#define KSMBD_CONFIG_OPT_AUTO 2
+#define KSMBD_CONFIG_OPT_MANDATORY 3
+
+#endif /* _LINUX_KSMBD_SERVER_H */
diff --git a/fs/cifsd/ksmbd_work.c b/fs/cifsd/ksmbd_work.c
new file mode 100644
index 000000000000..8cd5dff0762d
--- /dev/null
+++ b/fs/cifsd/ksmbd_work.c
@@ -0,0 +1,93 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2019 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#include "server.h"
+#include "connection.h"
+#include "ksmbd_work.h"
+#include "buffer_pool.h"
+#include "mgmt/ksmbd_ida.h"
+
+/* @FIXME */
+#include "ksmbd_server.h"
+
+static struct kmem_cache *work_cache;
+static struct workqueue_struct *ksmbd_wq;
+
+struct ksmbd_work *ksmbd_alloc_work_struct(void)
+{
+ struct ksmbd_work *work = kmem_cache_zalloc(work_cache, GFP_KERNEL);
+
+ if (work) {
+ work->compound_fid = KSMBD_NO_FID;
+ work->compound_pfid = KSMBD_NO_FID;
+ INIT_LIST_HEAD(&work->request_entry);
+ INIT_LIST_HEAD(&work->async_request_entry);
+ INIT_LIST_HEAD(&work->fp_entry);
+ INIT_LIST_HEAD(&work->interim_entry);
+ }
+ return work;
+}
+
+void ksmbd_free_work_struct(struct ksmbd_work *work)
+{
+ WARN_ON(work->saved_cred != NULL);
+ if (server_conf.flags & KSMBD_GLOBAL_FLAG_CACHE_TBUF &&
+ work->set_trans_buf)
+ ksmbd_release_buffer(RESPONSE_BUF(work));
+ else
+ ksmbd_free_response(RESPONSE_BUF(work));
+
+ if (server_conf.flags & KSMBD_GLOBAL_FLAG_CACHE_RBUF &&
+ work->set_read_buf)
+ ksmbd_release_buffer(AUX_PAYLOAD(work));
+ else
+ ksmbd_free_response(AUX_PAYLOAD(work));
+
+ ksmbd_free_response(TRANSFORM_BUF(work));
+ ksmbd_free_request(REQUEST_BUF(work));
+ if (work->async_id)
+ ksmbd_release_id(work->conn->async_ida, work->async_id);
+ kmem_cache_free(work_cache, work);
+}
+
+void ksmbd_work_pool_destroy(void)
+{
+ kmem_cache_destroy(work_cache);
+}
+
+int ksmbd_work_pool_init(void)
+{
+ work_cache = kmem_cache_create("ksmbd_work_cache",
+ sizeof(struct ksmbd_work), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!work_cache)
+ return -ENOMEM;
+ return 0;
+}
+
+int ksmbd_workqueue_init(void)
+{
+ ksmbd_wq = alloc_workqueue("ksmbd-io", 0, 0);
+ if (!ksmbd_wq)
+ return -ENOMEM;
+ return 0;
+}
+
+void ksmbd_workqueue_destroy(void)
+{
+ flush_workqueue(ksmbd_wq);
+ destroy_workqueue(ksmbd_wq);
+ ksmbd_wq = NULL;
+}
+
+bool ksmbd_queue_work(struct ksmbd_work *work)
+{
+ return queue_work(ksmbd_wq, &work->work);
+}
diff --git a/fs/cifsd/ksmbd_work.h b/fs/cifsd/ksmbd_work.h
new file mode 100644
index 000000000000..405434d4c8ab
--- /dev/null
+++ b/fs/cifsd/ksmbd_work.h
@@ -0,0 +1,124 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019 Samsung Electronics Co., Ltd.
+ */
+
+#ifndef __KSMBD_WORK_H__
+#define __KSMBD_WORK_H__
+
+#include <linux/ctype.h>
+#include <linux/workqueue.h>
+
+struct ksmbd_conn;
+struct ksmbd_session;
+struct ksmbd_tree_connect;
+
+enum {
+ KSMBD_WORK_ACTIVE = 0,
+ KSMBD_WORK_CANCELLED,
+ KSMBD_WORK_CLOSED,
+};
+
+/* one of these for every pending CIFS request at the connection */
+struct ksmbd_work {
+ /* Server corresponding to this mid */
+ struct ksmbd_conn *conn;
+ struct ksmbd_session *sess;
+ struct ksmbd_tree_connect *tcon;
+
+ /* Pointer to received SMB header */
+ char *request_buf;
+ /* Response buffer */
+ char *response_buf;
+
+ /* Read data buffer */
+ char *aux_payload_buf;
+
+ /* Next cmd hdr in compound req buf*/
+ int next_smb2_rcv_hdr_off;
+ /* Next cmd hdr in compound rsp buf*/
+ int next_smb2_rsp_hdr_off;
+
+ /*
+ * Current Local FID assigned compound response if SMB2 CREATE
+ * command is present in compound request
+ */
+ unsigned int compound_fid;
+ unsigned int compound_pfid;
+ unsigned int compound_sid;
+
+ const struct cred *saved_cred;
+
+ /* Number of granted credits */
+ unsigned int credits_granted;
+
+ /* response smb header size */
+ unsigned int resp_hdr_sz;
+ unsigned int response_sz;
+ /* Read data count */
+ unsigned int aux_payload_sz;
+
+ void *tr_buf;
+
+ unsigned char state;
+ /* Multiple responses for one request e.g. SMB ECHO */
+ bool multiRsp:1;
+ /* No response for cancelled request */
+ bool send_no_response:1;
+ /* Request is encrypted */
+ bool encrypted:1;
+ /* Is this SYNC or ASYNC ksmbd_work */
+ bool syncronous:1;
+ bool need_invalidate_rkey:1;
+ bool set_trans_buf:1;
+ bool set_read_buf:1;
+
+ unsigned int remote_key;
+ /* cancel works */
+ int async_id;
+ void **cancel_argv;
+ void (*cancel_fn)(void **argv);
+
+ struct work_struct work;
+ /* List head at conn->requests */
+ struct list_head request_entry;
+ /* List head at conn->async_requests */
+ struct list_head async_request_entry;
+ struct list_head fp_entry;
+ struct list_head interim_entry;
+};
+
+#define WORK_CANCELLED(w) ((w)->state == KSMBD_WORK_CANCELLED)
+#define WORK_CLOSED(w) ((w)->state == KSMBD_WORK_CLOSED)
+#define WORK_ACTIVE(w) ((w)->state == KSMBD_WORK_ACTIVE)
+
+#define RESPONSE_BUF(w) ((void *)(w)->response_buf)
+#define REQUEST_BUF(w) ((void *)(w)->request_buf)
+
+#define RESPONSE_BUF_NEXT(w) \
+ ((void *)((w)->response_buf + (w)->next_smb2_rsp_hdr_off))
+#define REQUEST_BUF_NEXT(w) \
+ ((void *)((w)->request_buf + (w)->next_smb2_rcv_hdr_off))
+
+#define RESPONSE_SZ(w) ((w)->response_sz)
+
+#define INIT_AUX_PAYLOAD(w) ((w)->aux_payload_buf = NULL)
+#define HAS_AUX_PAYLOAD(w) ((w)->aux_payload_sz != 0)
+#define AUX_PAYLOAD(w) ((void *)((w)->aux_payload_buf))
+#define AUX_PAYLOAD_SIZE(w) ((w)->aux_payload_sz)
+#define RESP_HDR_SIZE(w) ((w)->resp_hdr_sz)
+
+#define HAS_TRANSFORM_BUF(w) ((w)->tr_buf != NULL)
+#define TRANSFORM_BUF(w) ((void *)((w)->tr_buf))
+
+struct ksmbd_work *ksmbd_alloc_work_struct(void);
+void ksmbd_free_work_struct(struct ksmbd_work *work);
+
+void ksmbd_work_pool_destroy(void);
+int ksmbd_work_pool_init(void);
+
+int ksmbd_workqueue_init(void);
+void ksmbd_workqueue_destroy(void);
+bool ksmbd_queue_work(struct ksmbd_work *work);
+
+#endif /* __KSMBD_WORK_H__ */
diff --git a/fs/cifsd/server.c b/fs/cifsd/server.c
new file mode 100644
index 000000000000..85862c3ea7c0
--- /dev/null
+++ b/fs/cifsd/server.c
@@ -0,0 +1,632 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#include "glob.h"
+#include "oplock.h"
+#include "misc.h"
+#include <linux/sched/signal.h>
+#include <linux/workqueue.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+#include "server.h"
+#include "smb_common.h"
+#include "smbstatus.h"
+#include "buffer_pool.h"
+#include "connection.h"
+#include "transport_ipc.h"
+#include "mgmt/user_session.h"
+#include "crypto_ctx.h"
+#include "auth.h"
+
+int ksmbd_debug_types;
+
+struct ksmbd_server_config server_conf;
+
+enum SERVER_CTRL_TYPE {
+ SERVER_CTRL_TYPE_INIT,
+ SERVER_CTRL_TYPE_RESET,
+};
+
+struct server_ctrl_struct {
+ int type;
+ struct work_struct ctrl_work;
+};
+
+static DEFINE_MUTEX(ctrl_lock);
+
+static int ___server_conf_set(int idx, char *val)
+{
+ if (idx >= ARRAY_SIZE(server_conf.conf))
+ return -EINVAL;
+
+ if (!val || val[0] == 0x00)
+ return -EINVAL;
+
+ kfree(server_conf.conf[idx]);
+ server_conf.conf[idx] = kstrdup(val, GFP_KERNEL);
+ if (!server_conf.conf[idx])
+ return -ENOMEM;
+ return 0;
+}
+
+int ksmbd_set_netbios_name(char *v)
+{
+ return ___server_conf_set(SERVER_CONF_NETBIOS_NAME, v);
+}
+
+int ksmbd_set_server_string(char *v)
+{
+ return ___server_conf_set(SERVER_CONF_SERVER_STRING, v);
+}
+
+int ksmbd_set_work_group(char *v)
+{
+ return ___server_conf_set(SERVER_CONF_WORK_GROUP, v);
+}
+
+char *ksmbd_netbios_name(void)
+{
+ return server_conf.conf[SERVER_CONF_NETBIOS_NAME];
+}
+
+char *ksmbd_server_string(void)
+{
+ return server_conf.conf[SERVER_CONF_SERVER_STRING];
+}
+
+char *ksmbd_work_group(void)
+{
+ return server_conf.conf[SERVER_CONF_WORK_GROUP];
+}
+
+/**
+ * check_conn_state() - check state of server thread connection
+ * @work: smb work containing server thread information
+ *
+ * Return: 0 on valid connection, otherwise 1 to reconnect
+ */
+static inline int check_conn_state(struct ksmbd_work *work)
+{
+ struct smb_hdr *rsp_hdr;
+
+ if (ksmbd_conn_exiting(work) || ksmbd_conn_need_reconnect(work)) {
+ rsp_hdr = RESPONSE_BUF(work);
+ rsp_hdr->Status.CifsError = STATUS_CONNECTION_DISCONNECTED;
+ return 1;
+ }
+ return 0;
+}
+
+#define TCP_HANDLER_CONTINUE 0
+#define TCP_HANDLER_ABORT 1
+
+static int __process_request(struct ksmbd_work *work,
+ struct ksmbd_conn *conn,
+ uint16_t *cmd)
+{
+ struct smb_version_cmds *cmds;
+ uint16_t command;
+ int ret;
+
+ if (check_conn_state(work))
+ return TCP_HANDLER_CONTINUE;
+
+ if (ksmbd_verify_smb_message(work))
+ return TCP_HANDLER_ABORT;
+
+ command = conn->ops->get_cmd_val(work);
+ *cmd = command;
+
+andx_again:
+ if (command >= conn->max_cmds) {
+ conn->ops->set_rsp_status(work, STATUS_INVALID_PARAMETER);
+ return TCP_HANDLER_CONTINUE;
+ }
+
+ cmds = &conn->cmds[command];
+ if (!cmds->proc) {
+ ksmbd_debug(SMB, "*** not implemented yet cmd = %x\n", command);
+ conn->ops->set_rsp_status(work, STATUS_NOT_IMPLEMENTED);
+ return TCP_HANDLER_CONTINUE;
+ }
+
+ if (work->sess && conn->ops->is_sign_req(work, command)) {
+ ret = conn->ops->check_sign_req(work);
+ if (!ret) {
+ conn->ops->set_rsp_status(work, STATUS_ACCESS_DENIED);
+ return TCP_HANDLER_CONTINUE;
+ }
+ }
+
+ ret = cmds->proc(work);
+
+ if (ret < 0)
+ ksmbd_debug(CONN, "Failed to process %u [%d]\n", command, ret);
+ /* AndX commands - chained request can return positive values */
+ else if (ret > 0) {
+ command = ret;
+ *cmd = command;
+ goto andx_again;
+ }
+
+ if (work->send_no_response)
+ return TCP_HANDLER_ABORT;
+ return TCP_HANDLER_CONTINUE;
+}
+
+static void __handle_ksmbd_work(struct ksmbd_work *work,
+ struct ksmbd_conn *conn)
+{
+ uint16_t command = 0;
+ int rc;
+
+ if (conn->ops->allocate_rsp_buf(work))
+ return;
+
+ if (conn->ops->is_transform_hdr &&
+ conn->ops->is_transform_hdr(REQUEST_BUF(work))) {
+ rc = conn->ops->decrypt_req(work);
+ if (rc < 0) {
+ conn->ops->set_rsp_status(work, STATUS_DATA_ERROR);
+ goto send;
+ }
+
+ work->encrypted = true;
+ }
+
+ rc = conn->ops->init_rsp_hdr(work);
+ if (rc) {
+ /* either uid or tid is not correct */
+ conn->ops->set_rsp_status(work, STATUS_INVALID_HANDLE);
+ goto send;
+ }
+
+ if (conn->ops->check_user_session) {
+ rc = conn->ops->check_user_session(work);
+ if (rc < 0) {
+ command = conn->ops->get_cmd_val(work);
+ conn->ops->set_rsp_status(work,
+ STATUS_USER_SESSION_DELETED);
+ goto send;
+ } else if (rc > 0) {
+ rc = conn->ops->get_ksmbd_tcon(work);
+ if (rc < 0) {
+ conn->ops->set_rsp_status(work,
+ STATUS_NETWORK_NAME_DELETED);
+ goto send;
+ }
+ }
+ }
+
+ do {
+ rc = __process_request(work, conn, &command);
+ if (rc == TCP_HANDLER_ABORT)
+ break;
+
+ /*
+ * Call smb2_set_rsp_credits() function to set number of credits
+ * granted in hdr of smb2 response.
+ */
+ if (conn->ops->set_rsp_credits) {
+ spin_lock(&conn->credits_lock);
+ rc = conn->ops->set_rsp_credits(work);
+ spin_unlock(&conn->credits_lock);
+ if (rc < 0) {
+ conn->ops->set_rsp_status(work,
+ STATUS_INVALID_PARAMETER);
+ goto send;
+ }
+ }
+
+ if (work->sess && (work->sess->sign ||
+ smb3_11_final_sess_setup_resp(work) ||
+ conn->ops->is_sign_req(work, command)))
+ conn->ops->set_sign_rsp(work);
+ } while (is_chained_smb2_message(work));
+
+ if (work->send_no_response)
+ return;
+
+send:
+ smb3_preauth_hash_rsp(work);
+ if (work->sess && work->sess->enc && work->encrypted &&
+ conn->ops->encrypt_resp) {
+ rc = conn->ops->encrypt_resp(work);
+ if (rc < 0) {
+ conn->ops->set_rsp_status(work, STATUS_DATA_ERROR);
+ goto send;
+ }
+ }
+
+ ksmbd_conn_write(work);
+}
+
+/**
+ * handle_ksmbd_work() - process pending smb work requests
+ * @wk: smb work containing request command buffer
+ *
+ * called by kworker threads to processing remaining smb work requests
+ */
+static void handle_ksmbd_work(struct work_struct *wk)
+{
+ struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
+ struct ksmbd_conn *conn = work->conn;
+
+ atomic64_inc(&conn->stats.request_served);
+
+ __handle_ksmbd_work(work, conn);
+
+ ksmbd_conn_try_dequeue_request(work);
+ ksmbd_free_work_struct(work);
+ atomic_dec(&conn->r_count);
+}
+
+/**
+ * queue_ksmbd_work() - queue a smb request to worker thread queue
+ * for proccessing smb command and sending response
+ * @conn: connection instance
+ *
+ * read remaining data from socket create and submit work.
+ */
+static int queue_ksmbd_work(struct ksmbd_conn *conn)
+{
+ struct ksmbd_work *work;
+
+ work = ksmbd_alloc_work_struct();
+ if (!work) {
+ ksmbd_err("allocation for work failed\n");
+ return -ENOMEM;
+ }
+
+ work->conn = conn;
+ work->request_buf = conn->request_buf;
+ conn->request_buf = NULL;
+
+ if (ksmbd_init_smb_server(work)) {
+ ksmbd_free_work_struct(work);
+ return -EINVAL;
+ }
+
+ ksmbd_conn_enqueue_request(work);
+ atomic_inc(&conn->r_count);
+ /* update activity on connection */
+ conn->last_active = jiffies;
+ INIT_WORK(&work->work, handle_ksmbd_work);
+ ksmbd_queue_work(work);
+ return 0;
+}
+
+static int ksmbd_server_process_request(struct ksmbd_conn *conn)
+{
+ return queue_ksmbd_work(conn);
+}
+
+static int ksmbd_server_terminate_conn(struct ksmbd_conn *conn)
+{
+ ksmbd_sessions_deregister(conn);
+ destroy_lease_table(conn);
+ return 0;
+}
+
+static void ksmbd_server_tcp_callbacks_init(void)
+{
+ struct ksmbd_conn_ops ops;
+
+ ops.process_fn = ksmbd_server_process_request;
+ ops.terminate_fn = ksmbd_server_terminate_conn;
+
+ ksmbd_conn_init_server_callbacks(&ops);
+}
+
+static void server_conf_free(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(server_conf.conf); i++) {
+ kfree(server_conf.conf[i]);
+ server_conf.conf[i] = NULL;
+ }
+}
+
+static int server_conf_init(void)
+{
+ WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP);
+ server_conf.enforced_signing = 0;
+ server_conf.min_protocol = ksmbd_min_protocol();
+ server_conf.max_protocol = ksmbd_max_protocol();
+ server_conf.auth_mechs = KSMBD_AUTH_NTLMSSP;
+#ifdef CONFIG_SMB_SERVER_KERBEROS5
+ server_conf.auth_mechs |= KSMBD_AUTH_KRB5 |
+ KSMBD_AUTH_MSKRB5;
+#endif
+ return 0;
+}
+
+static void server_ctrl_handle_init(struct server_ctrl_struct *ctrl)
+{
+ int ret;
+
+ ret = ksmbd_conn_transport_init();
+ if (ret) {
+ server_queue_ctrl_reset_work();
+ return;
+ }
+
+ WRITE_ONCE(server_conf.state, SERVER_STATE_RUNNING);
+}
+
+static void server_ctrl_handle_reset(struct server_ctrl_struct *ctrl)
+{
+ ksmbd_ipc_soft_reset();
+ ksmbd_conn_transport_destroy();
+ server_conf_free();
+ server_conf_init();
+ WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP);
+}
+
+static void server_ctrl_handle_work(struct work_struct *work)
+{
+ struct server_ctrl_struct *ctrl;
+
+ ctrl = container_of(work, struct server_ctrl_struct, ctrl_work);
+
+ mutex_lock(&ctrl_lock);
+ switch (ctrl->type) {
+ case SERVER_CTRL_TYPE_INIT:
+ server_ctrl_handle_init(ctrl);
+ break;
+ case SERVER_CTRL_TYPE_RESET:
+ server_ctrl_handle_reset(ctrl);
+ break;
+ default:
+ pr_err("Unknown server work type: %d\n", ctrl->type);
+ }
+ mutex_unlock(&ctrl_lock);
+ kfree(ctrl);
+ module_put(THIS_MODULE);
+}
+
+static int __queue_ctrl_work(int type)
+{
+ struct server_ctrl_struct *ctrl;
+
+ ctrl = kmalloc(sizeof(struct server_ctrl_struct), GFP_KERNEL);
+ if (!ctrl)
+ return -ENOMEM;
+
+ __module_get(THIS_MODULE);
+ ctrl->type = type;
+ INIT_WORK(&ctrl->ctrl_work, server_ctrl_handle_work);
+ queue_work(system_long_wq, &ctrl->ctrl_work);
+ return 0;
+}
+
+int server_queue_ctrl_init_work(void)
+{
+ return __queue_ctrl_work(SERVER_CTRL_TYPE_INIT);
+}
+
+int server_queue_ctrl_reset_work(void)
+{
+ return __queue_ctrl_work(SERVER_CTRL_TYPE_RESET);
+}
+
+static ssize_t stats_show(struct class *class,
+ struct class_attribute *attr,
+ char *buf)
+{
+ /*
+ * Inc this each time you change stats output format,
+ * so user space will know what to do.
+ */
+ static int stats_version = 2;
+ static const char * const state[] = {
+ "startup",
+ "running",
+ "reset",
+ "shutdown"
+ };
+
+ ssize_t sz = scnprintf(buf,
+ PAGE_SIZE,
+ "%d %s %d %lu\n",
+ stats_version,
+ state[server_conf.state],
+ server_conf.tcp_port,
+ server_conf.ipc_last_active / HZ);
+ return sz;
+}
+
+static ssize_t kill_server_store(struct class *class,
+ struct class_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ if (!sysfs_streq(buf, "hard"))
+ return len;
+
+ ksmbd_info("kill command received\n");
+ mutex_lock(&ctrl_lock);
+ WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING);
+ __module_get(THIS_MODULE);
+ server_ctrl_handle_reset(NULL);
+ module_put(THIS_MODULE);
+ mutex_unlock(&ctrl_lock);
+ return len;
+}
+
+static const char * const debug_type_strings[] = {"smb", "auth", "vfs",
+ "oplock", "ipc", "conn",
+ "rdma"};
+
+static ssize_t debug_show(struct class *class,
+ struct class_attribute *attr,
+ char *buf)
+{
+ ssize_t sz = 0;
+ int i, pos = 0;
+
+ for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
+ if ((ksmbd_debug_types >> i) & 1) {
+ pos = scnprintf(buf + sz,
+ PAGE_SIZE - sz,
+ "[%s] ",
+ debug_type_strings[i]);
+ } else {
+ pos = scnprintf(buf + sz,
+ PAGE_SIZE - sz,
+ "%s ",
+ debug_type_strings[i]);
+ }
+ sz += pos;
+
+ }
+ sz += scnprintf(buf + sz, PAGE_SIZE - sz, "\n");
+ return sz;
+}
+
+static ssize_t debug_store(struct class *class,
+ struct class_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
+ if (sysfs_streq(buf, "all")) {
+ if (ksmbd_debug_types == KSMBD_DEBUG_ALL)
+ ksmbd_debug_types = 0;
+ else
+ ksmbd_debug_types = KSMBD_DEBUG_ALL;
+ break;
+ }
+
+ if (sysfs_streq(buf, debug_type_strings[i])) {
+ if (ksmbd_debug_types & (1 << i))
+ ksmbd_debug_types &= ~(1 << i);
+ else
+ ksmbd_debug_types |= (1 << i);
+ break;
+ }
+ }
+
+ return len;
+}
+
+static CLASS_ATTR_RO(stats);
+static CLASS_ATTR_WO(kill_server);
+static CLASS_ATTR_RW(debug);
+
+static struct attribute *ksmbd_control_class_attrs[] = {
+ &class_attr_stats.attr,
+ &class_attr_kill_server.attr,
+ &class_attr_debug.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(ksmbd_control_class);
+
+static struct class ksmbd_control_class = {
+ .name = "ksmbd-control",
+ .owner = THIS_MODULE,
+ .class_groups = ksmbd_control_class_groups,
+};
+
+static int ksmbd_server_shutdown(void)
+{
+ WRITE_ONCE(server_conf.state, SERVER_STATE_SHUTTING_DOWN);
+
+ class_unregister(&ksmbd_control_class);
+ ksmbd_workqueue_destroy();
+ ksmbd_ipc_release();
+ ksmbd_conn_transport_destroy();
+ ksmbd_free_session_table();
+ ksmbd_crypto_destroy();
+ ksmbd_free_global_file_table();
+ destroy_lease_table(NULL);
+ ksmbd_destroy_buffer_pools();
+ server_conf_free();
+ return 0;
+}
+
+static int __init ksmbd_server_init(void)
+{
+ int ret;
+
+ ret = class_register(&ksmbd_control_class);
+ if (ret) {
+ ksmbd_err("Unable to register ksmbd-control class\n");
+ return ret;
+ }
+
+ ksmbd_server_tcp_callbacks_init();
+
+ ret = server_conf_init();
+ if (ret)
+ return ret;
+
+ ret = ksmbd_init_buffer_pools();
+ if (ret)
+ return ret;
+
+ ret = ksmbd_init_session_table();
+ if (ret)
+ goto error;
+
+ ret = ksmbd_ipc_init();
+ if (ret)
+ goto error;
+
+ ret = ksmbd_init_global_file_table();
+ if (ret)
+ goto error;
+
+ ret = ksmbd_inode_hash_init();
+ if (ret)
+ goto error;
+
+ ret = ksmbd_crypto_create();
+ if (ret)
+ goto error;
+
+ ret = ksmbd_workqueue_init();
+ if (ret)
+ goto error;
+ return 0;
+
+error:
+ ksmbd_server_shutdown();
+ return ret;
+}
+
+/**
+ * ksmbd_server_exit() - shutdown forker thread and free memory at module exit
+ */
+static void __exit ksmbd_server_exit(void)
+{
+ ksmbd_server_shutdown();
+ ksmbd_release_inode_hash();
+}
+
+MODULE_AUTHOR("Namjae Jeon <linkinjeon@kernel.org>");
+MODULE_VERSION(KSMBD_VERSION);
+MODULE_DESCRIPTION("Linux kernel CIFS/SMB SERVER");
+MODULE_LICENSE("GPL");
+MODULE_SOFTDEP("pre: ecb");
+MODULE_SOFTDEP("pre: hmac");
+MODULE_SOFTDEP("pre: md4");
+MODULE_SOFTDEP("pre: md5");
+MODULE_SOFTDEP("pre: nls");
+MODULE_SOFTDEP("pre: aes");
+MODULE_SOFTDEP("pre: cmac");
+MODULE_SOFTDEP("pre: sha256");
+MODULE_SOFTDEP("pre: sha512");
+MODULE_SOFTDEP("pre: aead2");
+MODULE_SOFTDEP("pre: ccm");
+MODULE_SOFTDEP("pre: gcm");
+module_init(ksmbd_server_init)
+module_exit(ksmbd_server_exit)
diff --git a/fs/cifsd/server.h b/fs/cifsd/server.h
new file mode 100644
index 000000000000..7b2f6318fcff
--- /dev/null
+++ b/fs/cifsd/server.h
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#ifndef __SERVER_H__
+#define __SERVER_H__
+
+#include "smbacl.h"
+
+#define SERVER_STATE_STARTING_UP 0
+#define SERVER_STATE_RUNNING 1
+#define SERVER_STATE_RESETTING 2
+#define SERVER_STATE_SHUTTING_DOWN 3
+
+#define SERVER_CONF_NETBIOS_NAME 0
+#define SERVER_CONF_SERVER_STRING 1
+#define SERVER_CONF_WORK_GROUP 2
+
+extern int ksmbd_debugging;
+
+struct ksmbd_server_config {
+ unsigned int flags;
+ unsigned int state;
+ short signing;
+ short enforced_signing;
+ short min_protocol;
+ short max_protocol;
+ unsigned short tcp_port;
+ unsigned short ipc_timeout;
+ unsigned long ipc_last_active;
+ unsigned long deadtime;
+ unsigned int share_fake_fscaps;
+ struct smb_sid domain_sid;
+ unsigned int auth_mechs;
+
+ char *conf[SERVER_CONF_WORK_GROUP + 1];
+};
+
+extern struct ksmbd_server_config server_conf;
+
+int ksmbd_set_netbios_name(char *v);
+int ksmbd_set_server_string(char *v);
+int ksmbd_set_work_group(char *v);
+
+char *ksmbd_netbios_name(void);
+char *ksmbd_server_string(void);
+char *ksmbd_work_group(void);
+
+static inline int ksmbd_server_running(void)
+{
+ return READ_ONCE(server_conf.state) == SERVER_STATE_RUNNING;
+}
+
+static inline int ksmbd_server_configurable(void)
+{
+ return READ_ONCE(server_conf.state) < SERVER_STATE_RESETTING;
+}
+
+int server_queue_ctrl_init_work(void);
+int server_queue_ctrl_reset_work(void);
+#endif /* __SERVER_H__ */
diff --git a/fs/cifsd/transport_ipc.c b/fs/cifsd/transport_ipc.c
new file mode 100644
index 000000000000..c49e46fda9b1
--- /dev/null
+++ b/fs/cifsd/transport_ipc.c
@@ -0,0 +1,897 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/jhash.h>
+#include <linux/slab.h>
+#include <linux/rwsem.h>
+#include <linux/mutex.h>
+#include <linux/wait.h>
+#include <linux/hashtable.h>
+#include <net/net_namespace.h>
+#include <net/genetlink.h>
+#include <linux/socket.h>
+#include <linux/workqueue.h>
+
+#include "vfs_cache.h"
+#include "transport_ipc.h"
+#include "buffer_pool.h"
+#include "server.h"
+#include "smb_common.h"
+
+#include "mgmt/user_config.h"
+#include "mgmt/share_config.h"
+#include "mgmt/user_session.h"
+#include "mgmt/tree_connect.h"
+#include "mgmt/ksmbd_ida.h"
+#include "connection.h"
+#include "transport_tcp.h"
+
+#define IPC_WAIT_TIMEOUT (2 * HZ)
+
+#define IPC_MSG_HASH_BITS 3
+static DEFINE_HASHTABLE(ipc_msg_table, IPC_MSG_HASH_BITS);
+static DECLARE_RWSEM(ipc_msg_table_lock);
+static DEFINE_MUTEX(startup_lock);
+
+static struct ksmbd_ida *ida;
+
+static unsigned int ksmbd_tools_pid;
+
+#define KSMBD_IPC_MSG_HANDLE(m) (*(unsigned int *)m)
+
+static bool ksmbd_ipc_validate_version(struct genl_info *m)
+{
+ if (m->genlhdr->version != KSMBD_GENL_VERSION) {
+ ksmbd_err("%s. ksmbd: %d, kernel module: %d. %s.\n",
+ "Daemon and kernel module version mismatch",
+ m->genlhdr->version,
+ KSMBD_GENL_VERSION,
+ "User-space ksmbd should terminate");
+ return false;
+ }
+ return true;
+}
+
+struct ksmbd_ipc_msg {
+ unsigned int type;
+ unsigned int sz;
+ unsigned char ____payload[0];
+};
+
+#define KSMBD_IPC_MSG_PAYLOAD(m) \
+ ((void *)(((struct ksmbd_ipc_msg *)(m))->____payload))
+
+struct ipc_msg_table_entry {
+ unsigned int handle;
+ unsigned int type;
+ wait_queue_head_t wait;
+ struct hlist_node ipc_table_hlist;
+
+ void *response;
+};
+
+static struct delayed_work ipc_timer_work;
+
+static int handle_startup_event(struct sk_buff *skb, struct genl_info *info);
+static int handle_unsupported_event(struct sk_buff *skb,
+ struct genl_info *info);
+static int handle_generic_event(struct sk_buff *skb, struct genl_info *info);
+static int ksmbd_ipc_heartbeat_request(void);
+
+static const struct nla_policy ksmbd_nl_policy[KSMBD_EVENT_MAX] = {
+ [KSMBD_EVENT_UNSPEC] = {
+ .len = 0,
+ },
+ [KSMBD_EVENT_HEARTBEAT_REQUEST] = {
+ .len = sizeof(struct ksmbd_heartbeat),
+ },
+ [KSMBD_EVENT_STARTING_UP] = {
+ .len = sizeof(struct ksmbd_startup_request),
+ },
+ [KSMBD_EVENT_SHUTTING_DOWN] = {
+ .len = sizeof(struct ksmbd_shutdown_request),
+ },
+ [KSMBD_EVENT_LOGIN_REQUEST] = {
+ .len = sizeof(struct ksmbd_login_request),
+ },
+ [KSMBD_EVENT_LOGIN_RESPONSE] = {
+ .len = sizeof(struct ksmbd_login_response),
+ },
+ [KSMBD_EVENT_SHARE_CONFIG_REQUEST] = {
+ .len = sizeof(struct ksmbd_share_config_request),
+ },
+ [KSMBD_EVENT_SHARE_CONFIG_RESPONSE] = {
+ .len = sizeof(struct ksmbd_share_config_response),
+ },
+ [KSMBD_EVENT_TREE_CONNECT_REQUEST] = {
+ .len = sizeof(struct ksmbd_tree_connect_request),
+ },
+ [KSMBD_EVENT_TREE_CONNECT_RESPONSE] = {
+ .len = sizeof(struct ksmbd_tree_connect_response),
+ },
+ [KSMBD_EVENT_TREE_DISCONNECT_REQUEST] = {
+ .len = sizeof(struct ksmbd_tree_disconnect_request),
+ },
+ [KSMBD_EVENT_LOGOUT_REQUEST] = {
+ .len = sizeof(struct ksmbd_logout_request),
+ },
+ [KSMBD_EVENT_RPC_REQUEST] = {
+ },
+ [KSMBD_EVENT_RPC_RESPONSE] = {
+ },
+ [KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST] = {
+ },
+ [KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE] = {
+ },
+};
+
+static struct genl_ops ksmbd_genl_ops[] = {
+ {
+ .cmd = KSMBD_EVENT_UNSPEC,
+ .doit = handle_unsupported_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_HEARTBEAT_REQUEST,
+ .doit = handle_unsupported_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_STARTING_UP,
+ .doit = handle_startup_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_SHUTTING_DOWN,
+ .doit = handle_unsupported_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_LOGIN_REQUEST,
+ .doit = handle_unsupported_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_LOGIN_RESPONSE,
+ .doit = handle_generic_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_SHARE_CONFIG_REQUEST,
+ .doit = handle_unsupported_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_SHARE_CONFIG_RESPONSE,
+ .doit = handle_generic_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_TREE_CONNECT_REQUEST,
+ .doit = handle_unsupported_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_TREE_CONNECT_RESPONSE,
+ .doit = handle_generic_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_TREE_DISCONNECT_REQUEST,
+ .doit = handle_unsupported_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_LOGOUT_REQUEST,
+ .doit = handle_unsupported_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_RPC_REQUEST,
+ .doit = handle_unsupported_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_RPC_RESPONSE,
+ .doit = handle_generic_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST,
+ .doit = handle_unsupported_event,
+ },
+ {
+ .cmd = KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE,
+ .doit = handle_generic_event,
+ },
+};
+
+static struct genl_family ksmbd_genl_family = {
+ .name = KSMBD_GENL_NAME,
+ .version = KSMBD_GENL_VERSION,
+ .hdrsize = 0,
+ .maxattr = KSMBD_EVENT_MAX,
+ .netnsok = true,
+ .module = THIS_MODULE,
+ .ops = ksmbd_genl_ops,
+ .n_ops = ARRAY_SIZE(ksmbd_genl_ops),
+};
+
+static void ksmbd_nl_init_fixup(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ksmbd_genl_ops); i++)
+ ksmbd_genl_ops[i].validate = GENL_DONT_VALIDATE_STRICT |
+ GENL_DONT_VALIDATE_DUMP;
+
+ ksmbd_genl_family.policy = ksmbd_nl_policy;
+}
+
+static int rpc_context_flags(struct ksmbd_session *sess)
+{
+ if (user_guest(sess->user))
+ return KSMBD_RPC_RESTRICTED_CONTEXT;
+ return 0;
+}
+
+static void ipc_update_last_active(void)
+{
+ if (server_conf.ipc_timeout)
+ server_conf.ipc_last_active = jiffies;
+}
+
+static struct ksmbd_ipc_msg *ipc_msg_alloc(size_t sz)
+{
+ struct ksmbd_ipc_msg *msg;
+ size_t msg_sz = sz + sizeof(struct ksmbd_ipc_msg);
+
+ msg = ksmbd_alloc(msg_sz);
+ if (msg)
+ msg->sz = sz;
+ return msg;
+}
+
+static void ipc_msg_free(struct ksmbd_ipc_msg *msg)
+{
+ ksmbd_free(msg);
+}
+
+static void ipc_msg_handle_free(int handle)
+{
+ if (handle >= 0)
+ ksmbd_release_id(ida, handle);
+}
+
+static int handle_response(int type, void *payload, size_t sz)
+{
+ int handle = KSMBD_IPC_MSG_HANDLE(payload);
+ struct ipc_msg_table_entry *entry;
+ int ret = 0;
+
+ ipc_update_last_active();
+ down_read(&ipc_msg_table_lock);
+ hash_for_each_possible(ipc_msg_table, entry, ipc_table_hlist, handle) {
+ if (handle != entry->handle)
+ continue;
+
+ entry->response = NULL;
+ /*
+ * Response message type value should be equal to
+ * request message type + 1.
+ */
+ if (entry->type + 1 != type) {
+ ksmbd_err("Waiting for IPC type %d, got %d. Ignore.\n",
+ entry->type + 1, type);
+ }
+
+ entry->response = ksmbd_alloc(sz);
+ if (!entry->response) {
+ ret = -ENOMEM;
+ break;
+ }
+
+ memcpy(entry->response, payload, sz);
+ wake_up_interruptible(&entry->wait);
+ ret = 0;
+ break;
+ }
+ up_read(&ipc_msg_table_lock);
+
+ return ret;
+}
+
+static int ipc_server_config_on_startup(struct ksmbd_startup_request *req)
+{
+ int ret;
+
+ ksmbd_set_fd_limit(req->file_max);
+ server_conf.flags = req->flags;
+ server_conf.signing = req->signing;
+ server_conf.tcp_port = req->tcp_port;
+ server_conf.ipc_timeout = req->ipc_timeout * HZ;
+ server_conf.deadtime = req->deadtime * SMB_ECHO_INTERVAL;
+ server_conf.share_fake_fscaps = req->share_fake_fscaps;
+ ksmbd_init_domain(req->sub_auth);
+
+ if (req->smb2_max_read)
+ init_smb2_max_read_size(req->smb2_max_read);
+ if (req->smb2_max_write)
+ init_smb2_max_write_size(req->smb2_max_write);
+ if (req->smb2_max_trans)
+ init_smb2_max_trans_size(req->smb2_max_trans);
+
+ ret = ksmbd_set_netbios_name(req->netbios_name);
+ ret |= ksmbd_set_server_string(req->server_string);
+ ret |= ksmbd_set_work_group(req->work_group);
+ ret |= ksmbd_tcp_set_interfaces(KSMBD_STARTUP_CONFIG_INTERFACES(req),
+ req->ifc_list_sz);
+ if (ret) {
+ ksmbd_err("Server configuration error: %s %s %s\n",
+ req->netbios_name,
+ req->server_string,
+ req->work_group);
+ return ret;
+ }
+
+ if (req->min_prot[0]) {
+ ret = ksmbd_lookup_protocol_idx(req->min_prot);
+ if (ret >= 0)
+ server_conf.min_protocol = ret;
+ }
+ if (req->max_prot[0]) {
+ ret = ksmbd_lookup_protocol_idx(req->max_prot);
+ if (ret >= 0)
+ server_conf.max_protocol = ret;
+ }
+
+ if (server_conf.ipc_timeout)
+ schedule_delayed_work(&ipc_timer_work, server_conf.ipc_timeout);
+ return 0;
+}
+
+static int handle_startup_event(struct sk_buff *skb, struct genl_info *info)
+{
+ int ret = 0;
+
+#ifdef CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN
+ if (!netlink_capable(skb, CAP_NET_ADMIN))
+ return -EPERM;
+#endif
+
+ if (!ksmbd_ipc_validate_version(info))
+ return -EINVAL;
+
+ if (!info->attrs[KSMBD_EVENT_STARTING_UP])
+ return -EINVAL;
+
+ mutex_lock(&startup_lock);
+ if (!ksmbd_server_configurable()) {
+ mutex_unlock(&startup_lock);
+ ksmbd_err("Server reset is in progress, can't start daemon\n");
+ return -EINVAL;
+ }
+
+ if (ksmbd_tools_pid) {
+ if (ksmbd_ipc_heartbeat_request() == 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ksmbd_err("Reconnect to a new user space daemon\n");
+ } else {
+ struct ksmbd_startup_request *req;
+
+ req = nla_data(info->attrs[info->genlhdr->cmd]);
+ ret = ipc_server_config_on_startup(req);
+ if (ret)
+ goto out;
+ server_queue_ctrl_init_work();
+ }
+
+ ksmbd_tools_pid = info->snd_portid;
+ ipc_update_last_active();
+
+out:
+ mutex_unlock(&startup_lock);
+ return ret;
+}
+
+static int handle_unsupported_event(struct sk_buff *skb,
+ struct genl_info *info)
+{
+ ksmbd_err("Unknown IPC event: %d, ignore.\n", info->genlhdr->cmd);
+ return -EINVAL;
+}
+
+static int handle_generic_event(struct sk_buff *skb, struct genl_info *info)
+{
+ void *payload;
+ int sz;
+ int type = info->genlhdr->cmd;
+
+#ifdef CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN
+ if (!netlink_capable(skb, CAP_NET_ADMIN))
+ return -EPERM;
+#endif
+
+ if (type >= KSMBD_EVENT_MAX) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ if (!ksmbd_ipc_validate_version(info))
+ return -EINVAL;
+
+ if (!info->attrs[type])
+ return -EINVAL;
+
+ payload = nla_data(info->attrs[info->genlhdr->cmd]);
+ sz = nla_len(info->attrs[info->genlhdr->cmd]);
+ return handle_response(type, payload, sz);
+}
+
+static int ipc_msg_send(struct ksmbd_ipc_msg *msg)
+{
+ struct genlmsghdr *nlh;
+ struct sk_buff *skb;
+ int ret = -EINVAL;
+
+ if (!ksmbd_tools_pid)
+ return ret;
+
+ skb = genlmsg_new(msg->sz, GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ nlh = genlmsg_put(skb, 0, 0, &ksmbd_genl_family, 0, msg->type);
+ if (!nlh)
+ goto out;
+
+ ret = nla_put(skb, msg->type, msg->sz, KSMBD_IPC_MSG_PAYLOAD(msg));
+ if (ret) {
+ genlmsg_cancel(skb, nlh);
+ goto out;
+ }
+
+ genlmsg_end(skb, nlh);
+ ret = genlmsg_unicast(&init_net, skb, ksmbd_tools_pid);
+ if (!ret)
+ ipc_update_last_active();
+ return ret;
+
+out:
+ nlmsg_free(skb);
+ return ret;
+}
+
+static void *ipc_msg_send_request(struct ksmbd_ipc_msg *msg,
+ unsigned int handle)
+{
+ struct ipc_msg_table_entry entry;
+ int ret;
+
+ if ((int)handle < 0)
+ return NULL;
+
+ entry.type = msg->type;
+ entry.response = NULL;
+ init_waitqueue_head(&entry.wait);
+
+ down_write(&ipc_msg_table_lock);
+ entry.handle = handle;
+ hash_add(ipc_msg_table, &entry.ipc_table_hlist, entry.handle);
+ up_write(&ipc_msg_table_lock);
+
+ ret = ipc_msg_send(msg);
+ if (ret)
+ goto out;
+
+ ret = wait_event_interruptible_timeout(entry.wait,
+ entry.response != NULL,
+ IPC_WAIT_TIMEOUT);
+out:
+ down_write(&ipc_msg_table_lock);
+ hash_del(&entry.ipc_table_hlist);
+ up_write(&ipc_msg_table_lock);
+ return entry.response;
+}
+
+static int ksmbd_ipc_heartbeat_request(void)
+{
+ struct ksmbd_ipc_msg *msg;
+ int ret;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_heartbeat));
+ if (!msg)
+ return -EINVAL;
+
+ msg->type = KSMBD_EVENT_HEARTBEAT_REQUEST;
+ ret = ipc_msg_send(msg);
+ ipc_msg_free(msg);
+ return ret;
+}
+
+struct ksmbd_login_response *ksmbd_ipc_login_request(const char *account)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_login_request *req;
+ struct ksmbd_login_response *resp;
+
+ if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
+ return NULL;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_login_request));
+ if (!msg)
+ return NULL;
+
+ msg->type = KSMBD_EVENT_LOGIN_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ req->handle = ksmbd_acquire_id(ida);
+ strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
+
+ resp = ipc_msg_send_request(msg, req->handle);
+ ipc_msg_handle_free(req->handle);
+ ipc_msg_free(msg);
+ return resp;
+}
+
+struct ksmbd_spnego_authen_response *
+ksmbd_ipc_spnego_authen_request(const char *spnego_blob, int blob_len)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_spnego_authen_request *req;
+ struct ksmbd_spnego_authen_response *resp;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_spnego_authen_request) +
+ blob_len + 1);
+ if (!msg)
+ return NULL;
+
+ msg->type = KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ req->handle = ksmbd_acquire_id(ida);
+ req->spnego_blob_len = blob_len;
+ memcpy(req->spnego_blob, spnego_blob, blob_len);
+
+ resp = ipc_msg_send_request(msg, req->handle);
+ ipc_msg_handle_free(req->handle);
+ ipc_msg_free(msg);
+ return resp;
+}
+
+struct ksmbd_tree_connect_response *
+ksmbd_ipc_tree_connect_request(struct ksmbd_session *sess,
+ struct ksmbd_share_config *share,
+ struct ksmbd_tree_connect *tree_conn,
+ struct sockaddr *peer_addr)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_tree_connect_request *req;
+ struct ksmbd_tree_connect_response *resp;
+
+ if (strlen(user_name(sess->user)) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
+ return NULL;
+
+ if (strlen(share->name) >= KSMBD_REQ_MAX_SHARE_NAME)
+ return NULL;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_tree_connect_request));
+ if (!msg)
+ return NULL;
+
+ msg->type = KSMBD_EVENT_TREE_CONNECT_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+
+ req->handle = ksmbd_acquire_id(ida);
+ req->account_flags = sess->user->flags;
+ req->session_id = sess->id;
+ req->connect_id = tree_conn->id;
+ strscpy(req->account, user_name(sess->user), KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
+ strscpy(req->share, share->name, KSMBD_REQ_MAX_SHARE_NAME);
+ snprintf(req->peer_addr, sizeof(req->peer_addr), "%pIS", peer_addr);
+
+ if (peer_addr->sa_family == AF_INET6)
+ req->flags |= KSMBD_TREE_CONN_FLAG_REQUEST_IPV6;
+ if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2))
+ req->flags |= KSMBD_TREE_CONN_FLAG_REQUEST_SMB2;
+
+ resp = ipc_msg_send_request(msg, req->handle);
+ ipc_msg_handle_free(req->handle);
+ ipc_msg_free(msg);
+ return resp;
+}
+
+int ksmbd_ipc_tree_disconnect_request(unsigned long long session_id,
+ unsigned long long connect_id)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_tree_disconnect_request *req;
+ int ret;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_tree_disconnect_request));
+ if (!msg)
+ return -ENOMEM;
+
+ msg->type = KSMBD_EVENT_TREE_DISCONNECT_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ req->session_id = session_id;
+ req->connect_id = connect_id;
+
+ ret = ipc_msg_send(msg);
+ ipc_msg_free(msg);
+ return ret;
+}
+
+int ksmbd_ipc_logout_request(const char *account)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_logout_request *req;
+ int ret;
+
+ if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
+ return -EINVAL;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_logout_request));
+ if (!msg)
+ return -ENOMEM;
+
+ msg->type = KSMBD_EVENT_LOGOUT_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
+
+ ret = ipc_msg_send(msg);
+ ipc_msg_free(msg);
+ return ret;
+}
+
+struct ksmbd_share_config_response *
+ksmbd_ipc_share_config_request(const char *name)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_share_config_request *req;
+ struct ksmbd_share_config_response *resp;
+
+ if (strlen(name) >= KSMBD_REQ_MAX_SHARE_NAME)
+ return NULL;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_share_config_request));
+ if (!msg)
+ return NULL;
+
+ msg->type = KSMBD_EVENT_SHARE_CONFIG_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ req->handle = ksmbd_acquire_id(ida);
+ strscpy(req->share_name, name, KSMBD_REQ_MAX_SHARE_NAME);
+
+ resp = ipc_msg_send_request(msg, req->handle);
+ ipc_msg_handle_free(req->handle);
+ ipc_msg_free(msg);
+ return resp;
+}
+
+struct ksmbd_rpc_command *ksmbd_rpc_open(struct ksmbd_session *sess,
+ int handle)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_rpc_command *req;
+ struct ksmbd_rpc_command *resp;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
+ if (!msg)
+ return NULL;
+
+ msg->type = KSMBD_EVENT_RPC_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ req->handle = handle;
+ req->flags = ksmbd_session_rpc_method(sess, handle);
+ req->flags |= KSMBD_RPC_OPEN_METHOD;
+ req->payload_sz = 0;
+
+ resp = ipc_msg_send_request(msg, req->handle);
+ ipc_msg_free(msg);
+ return resp;
+}
+
+struct ksmbd_rpc_command *ksmbd_rpc_close(struct ksmbd_session *sess,
+ int handle)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_rpc_command *req;
+ struct ksmbd_rpc_command *resp;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
+ if (!msg)
+ return NULL;
+
+ msg->type = KSMBD_EVENT_RPC_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ req->handle = handle;
+ req->flags = ksmbd_session_rpc_method(sess, handle);
+ req->flags |= KSMBD_RPC_CLOSE_METHOD;
+ req->payload_sz = 0;
+
+ resp = ipc_msg_send_request(msg, req->handle);
+ ipc_msg_free(msg);
+ return resp;
+}
+
+struct ksmbd_rpc_command *ksmbd_rpc_write(struct ksmbd_session *sess,
+ int handle,
+ void *payload,
+ size_t payload_sz)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_rpc_command *req;
+ struct ksmbd_rpc_command *resp;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
+ if (!msg)
+ return NULL;
+
+ msg->type = KSMBD_EVENT_RPC_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ req->handle = handle;
+ req->flags = ksmbd_session_rpc_method(sess, handle);
+ req->flags |= rpc_context_flags(sess);
+ req->flags |= KSMBD_RPC_WRITE_METHOD;
+ req->payload_sz = payload_sz;
+ memcpy(req->payload, payload, payload_sz);
+
+ resp = ipc_msg_send_request(msg, req->handle);
+ ipc_msg_free(msg);
+ return resp;
+}
+
+struct ksmbd_rpc_command *ksmbd_rpc_read(struct ksmbd_session *sess,
+ int handle)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_rpc_command *req;
+ struct ksmbd_rpc_command *resp;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
+ if (!msg)
+ return NULL;
+
+ msg->type = KSMBD_EVENT_RPC_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ req->handle = handle;
+ req->flags = ksmbd_session_rpc_method(sess, handle);
+ req->flags |= rpc_context_flags(sess);
+ req->flags |= KSMBD_RPC_READ_METHOD;
+ req->payload_sz = 0;
+
+ resp = ipc_msg_send_request(msg, req->handle);
+ ipc_msg_free(msg);
+ return resp;
+}
+
+struct ksmbd_rpc_command *ksmbd_rpc_ioctl(struct ksmbd_session *sess,
+ int handle,
+ void *payload,
+ size_t payload_sz)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_rpc_command *req;
+ struct ksmbd_rpc_command *resp;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
+ if (!msg)
+ return NULL;
+
+ msg->type = KSMBD_EVENT_RPC_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ req->handle = handle;
+ req->flags = ksmbd_session_rpc_method(sess, handle);
+ req->flags |= rpc_context_flags(sess);
+ req->flags |= KSMBD_RPC_IOCTL_METHOD;
+ req->payload_sz = payload_sz;
+ memcpy(req->payload, payload, payload_sz);
+
+ resp = ipc_msg_send_request(msg, req->handle);
+ ipc_msg_free(msg);
+ return resp;
+}
+
+struct ksmbd_rpc_command *ksmbd_rpc_rap(struct ksmbd_session *sess,
+ void *payload,
+ size_t payload_sz)
+{
+ struct ksmbd_ipc_msg *msg;
+ struct ksmbd_rpc_command *req;
+ struct ksmbd_rpc_command *resp;
+
+ msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
+ if (!msg)
+ return NULL;
+
+ msg->type = KSMBD_EVENT_RPC_REQUEST;
+ req = KSMBD_IPC_MSG_PAYLOAD(msg);
+ req->handle = ksmbd_acquire_id(ida);
+ req->flags = rpc_context_flags(sess);
+ req->flags |= KSMBD_RPC_RAP_METHOD;
+ req->payload_sz = payload_sz;
+ memcpy(req->payload, payload, payload_sz);
+
+ resp = ipc_msg_send_request(msg, req->handle);
+ ipc_msg_handle_free(req->handle);
+ ipc_msg_free(msg);
+ return resp;
+}
+
+static int __ipc_heartbeat(void)
+{
+ unsigned long delta;
+
+ if (!ksmbd_server_running())
+ return 0;
+
+ if (time_after(jiffies, server_conf.ipc_last_active)) {
+ delta = (jiffies - server_conf.ipc_last_active);
+ } else {
+ ipc_update_last_active();
+ schedule_delayed_work(&ipc_timer_work,
+ server_conf.ipc_timeout);
+ return 0;
+ }
+
+ if (delta < server_conf.ipc_timeout) {
+ schedule_delayed_work(&ipc_timer_work,
+ server_conf.ipc_timeout - delta);
+ return 0;
+ }
+
+ if (ksmbd_ipc_heartbeat_request() == 0) {
+ schedule_delayed_work(&ipc_timer_work,
+ server_conf.ipc_timeout);
+ return 0;
+ }
+
+ mutex_lock(&startup_lock);
+ WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING);
+ server_conf.ipc_last_active = 0;
+ ksmbd_tools_pid = 0;
+ ksmbd_err("No IPC daemon response for %lus\n", delta / HZ);
+ mutex_unlock(&startup_lock);
+ return -EINVAL;
+}
+
+static void ipc_timer_heartbeat(struct work_struct *w)
+{
+ if (__ipc_heartbeat())
+ server_queue_ctrl_reset_work();
+}
+
+int ksmbd_ipc_id_alloc(void)
+{
+ return ksmbd_acquire_id(ida);
+}
+
+void ksmbd_rpc_id_free(int handle)
+{
+ ksmbd_release_id(ida, handle);
+}
+
+void ksmbd_ipc_release(void)
+{
+ cancel_delayed_work_sync(&ipc_timer_work);
+ ksmbd_ida_free(ida);
+ genl_unregister_family(&ksmbd_genl_family);
+}
+
+void ksmbd_ipc_soft_reset(void)
+{
+ mutex_lock(&startup_lock);
+ ksmbd_tools_pid = 0;
+ cancel_delayed_work_sync(&ipc_timer_work);
+ mutex_unlock(&startup_lock);
+}
+
+int ksmbd_ipc_init(void)
+{
+ int ret;
+
+ ksmbd_nl_init_fixup();
+ INIT_DELAYED_WORK(&ipc_timer_work, ipc_timer_heartbeat);
+
+ ret = genl_register_family(&ksmbd_genl_family);
+ if (ret) {
+ ksmbd_err("Failed to register KSMBD netlink interface %d\n",
+ ret);
+ return ret;
+ }
+
+ ida = ksmbd_ida_alloc();
+ if (!ida)
+ return -ENOMEM;
+ return 0;
+}
diff --git a/fs/cifsd/transport_ipc.h b/fs/cifsd/transport_ipc.h
new file mode 100644
index 000000000000..6ed7cbea727e
--- /dev/null
+++ b/fs/cifsd/transport_ipc.h
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#ifndef __KSMBD_TRANSPORT_IPC_H__
+#define __KSMBD_TRANSPORT_IPC_H__
+
+#include <linux/wait.h>
+
+#define KSMBD_IPC_MAX_PAYLOAD 4096
+
+struct ksmbd_login_response *
+ksmbd_ipc_login_request(const char *account);
+
+struct ksmbd_session;
+struct ksmbd_share_config;
+struct ksmbd_tree_connect;
+struct sockaddr;
+
+struct ksmbd_tree_connect_response *
+ksmbd_ipc_tree_connect_request(struct ksmbd_session *sess,
+ struct ksmbd_share_config *share,
+ struct ksmbd_tree_connect *tree_conn,
+ struct sockaddr *peer_addr);
+
+int ksmbd_ipc_tree_disconnect_request(unsigned long long session_id,
+ unsigned long long connect_id);
+int ksmbd_ipc_logout_request(const char *account);
+
+struct ksmbd_share_config_response *
+ksmbd_ipc_share_config_request(const char *name);
+
+struct ksmbd_spnego_authen_response *
+ksmbd_ipc_spnego_authen_request(const char *spnego_blob, int blob_len);
+
+int ksmbd_ipc_id_alloc(void);
+void ksmbd_rpc_id_free(int handle);
+
+struct ksmbd_rpc_command *ksmbd_rpc_open(struct ksmbd_session *sess,
+ int handle);
+struct ksmbd_rpc_command *ksmbd_rpc_close(struct ksmbd_session *sess,
+ int handle);
+
+struct ksmbd_rpc_command *ksmbd_rpc_write(struct ksmbd_session *sess,
+ int handle,
+ void *payload,
+ size_t payload_sz);
+struct ksmbd_rpc_command *ksmbd_rpc_read(struct ksmbd_session *sess,
+ int handle);
+struct ksmbd_rpc_command *ksmbd_rpc_ioctl(struct ksmbd_session *sess,
+ int handle,
+ void *payload,
+ size_t payload_sz);
+struct ksmbd_rpc_command *ksmbd_rpc_rap(struct ksmbd_session *sess,
+ void *payload,
+ size_t payload_sz);
+
+void ksmbd_ipc_release(void);
+void ksmbd_ipc_soft_reset(void);
+int ksmbd_ipc_init(void);
+#endif /* __KSMBD_TRANSPORT_IPC_H__ */
diff --git a/fs/cifsd/transport_rdma.c b/fs/cifsd/transport_rdma.c
new file mode 100644
index 000000000000..45b76847f1e7
--- /dev/null
+++ b/fs/cifsd/transport_rdma.c
@@ -0,0 +1,2051 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2017, Microsoft Corporation.
+ * Copyright (C) 2018, LG Electronics.
+ *
+ * Author(s): Long Li <longli@microsoft.com>,
+ * Hyunchul Lee <hyc.lee@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ */
+
+#define SUBMOD_NAME "smb_direct"
+
+#include <linux/kthread.h>
+#include <linux/rwlock.h>
+#include <linux/list.h>
+#include <linux/mempool.h>
+#include <linux/highmem.h>
+#include <linux/scatterlist.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <rdma/rw.h>
+
+#include "glob.h"
+#include "connection.h"
+#include "smb_common.h"
+#include "smbstatus.h"
+#include "buffer_pool.h"
+#include "transport_rdma.h"
+
+#define SMB_DIRECT_PORT 5445
+
+#define SMB_DIRECT_VERSION_LE cpu_to_le16(0x0100)
+
+/* SMB_DIRECT negotiation timeout in seconds */
+#define SMB_DIRECT_NEGOTIATE_TIMEOUT 120
+
+#define SMB_DIRECT_MAX_SEND_SGES 8
+#define SMB_DIRECT_MAX_RECV_SGES 1
+
+/*
+ * Default maximum number of RDMA read/write outstanding on this connection
+ * This value is possibly decreased during QP creation on hardware limit
+ */
+#define SMB_DIRECT_CM_INITIATOR_DEPTH 8
+
+/* Maximum number of retries on data transfer operations */
+#define SMB_DIRECT_CM_RETRY 6
+/* No need to retry on Receiver Not Ready since SMB_DIRECT manages credits */
+#define SMB_DIRECT_CM_RNR_RETRY 0
+
+/*
+ * User configurable initial values per SMB_DIRECT transport connection
+ * as defined in [MS-KSMBD] 3.1.1.1
+ * Those may change after a SMB_DIRECT negotiation
+ */
+/* The local peer's maximum number of credits to grant to the peer */
+static int smb_direct_receive_credit_max = 255;
+
+/* The remote peer's credit request of local peer */
+static int smb_direct_send_credit_target = 255;
+
+/* The maximum single message size can be sent to remote peer */
+static int smb_direct_max_send_size = 8192;
+
+/* The maximum fragmented upper-layer payload receive size supported */
+static int smb_direct_max_fragmented_recv_size = 1024 * 1024;
+
+/* The maximum single-message size which can be received */
+static int smb_direct_max_receive_size = 8192;
+
+static int smb_direct_max_read_write_size = 1024 * 1024;
+
+static int smb_direct_max_outstanding_rw_ops = 8;
+
+static struct smb_direct_listener {
+ struct rdma_cm_id *cm_id;
+} smb_direct_listener;
+
+
+static struct workqueue_struct *smb_direct_wq;
+
+enum smb_direct_status {
+ SMB_DIRECT_CS_NEW = 0,
+ SMB_DIRECT_CS_CONNECTED,
+ SMB_DIRECT_CS_DISCONNECTING,
+ SMB_DIRECT_CS_DISCONNECTED,
+};
+
+struct smb_direct_transport {
+ struct ksmbd_transport transport;
+
+ enum smb_direct_status status;
+ bool full_packet_received;
+ wait_queue_head_t wait_status;
+
+ struct rdma_cm_id *cm_id;
+ struct ib_cq *send_cq;
+ struct ib_cq *recv_cq;
+ struct ib_pd *pd;
+ struct ib_qp *qp;
+
+ int max_send_size;
+ int max_recv_size;
+ int max_fragmented_send_size;
+ int max_fragmented_recv_size;
+ int max_rdma_rw_size;
+
+ spinlock_t reassembly_queue_lock;
+ struct list_head reassembly_queue;
+ int reassembly_data_length;
+ int reassembly_queue_length;
+ int first_entry_offset;
+ wait_queue_head_t wait_reassembly_queue;
+
+ spinlock_t receive_credit_lock;
+ int recv_credits;
+ int count_avail_recvmsg;
+ int recv_credit_max;
+ int recv_credit_target;
+
+ spinlock_t recvmsg_queue_lock;
+ struct list_head recvmsg_queue;
+
+ spinlock_t empty_recvmsg_queue_lock;
+ struct list_head empty_recvmsg_queue;
+
+ int send_credit_target;
+ atomic_t send_credits;
+ spinlock_t lock_new_recv_credits;
+ int new_recv_credits;
+ atomic_t rw_avail_ops;
+
+ wait_queue_head_t wait_send_credits;
+ wait_queue_head_t wait_rw_avail_ops;
+
+ mempool_t *sendmsg_mempool;
+ struct kmem_cache *sendmsg_cache;
+ mempool_t *recvmsg_mempool;
+ struct kmem_cache *recvmsg_cache;
+
+ wait_queue_head_t wait_send_payload_pending;
+ atomic_t send_payload_pending;
+ wait_queue_head_t wait_send_pending;
+ atomic_t send_pending;
+
+ struct delayed_work post_recv_credits_work;
+ struct work_struct send_immediate_work;
+ struct work_struct disconnect_work;
+
+ bool negotiation_requested;
+};
+
+#define KSMBD_TRANS(t) ((struct ksmbd_transport *)&((t)->transport))
+#define SMB_DIRECT_TRANS(t) ((struct smb_direct_transport *)container_of(t, \
+ struct smb_direct_transport, transport))
+
+enum {
+ SMB_DIRECT_MSG_NEGOTIATE_REQ = 0,
+ SMB_DIRECT_MSG_DATA_TRANSFER
+};
+
+static struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops;
+
+struct smb_direct_send_ctx {
+ struct list_head msg_list;
+ int wr_cnt;
+ bool need_invalidate_rkey;
+ unsigned int remote_key;
+};
+
+struct smb_direct_sendmsg {
+ struct smb_direct_transport *transport;
+ struct ib_send_wr wr;
+ struct list_head list;
+ int num_sge;
+ struct ib_sge sge[SMB_DIRECT_MAX_SEND_SGES];
+ struct ib_cqe cqe;
+ u8 packet[];
+};
+
+struct smb_direct_recvmsg {
+ struct smb_direct_transport *transport;
+ struct list_head list;
+ int type;
+ struct ib_sge sge;
+ struct ib_cqe cqe;
+ bool first_segment;
+ u8 packet[];
+};
+
+struct smb_direct_rdma_rw_msg {
+ struct smb_direct_transport *t;
+ struct ib_cqe cqe;
+ struct completion *completion;
+ struct rdma_rw_ctx rw_ctx;
+ struct sg_table sgt;
+ struct scatterlist sg_list[0];
+};
+
+#define BUFFER_NR_PAGES(buf, len) \
+ (DIV_ROUND_UP((unsigned long)(buf) + (len), PAGE_SIZE) \
+ - (unsigned long)(buf) / PAGE_SIZE)
+
+static void smb_direct_destroy_pools(struct smb_direct_transport *transport);
+static void smb_direct_post_recv_credits(struct work_struct *work);
+static int smb_direct_post_send_data(struct smb_direct_transport *t,
+ struct smb_direct_send_ctx *send_ctx,
+ struct kvec *iov, int niov, int remaining_data_length);
+
+static inline void
+*smb_direct_recvmsg_payload(struct smb_direct_recvmsg *recvmsg)
+{
+ return (void *)recvmsg->packet;
+}
+
+static inline bool is_receive_credit_post_required(int receive_credits,
+ int avail_recvmsg_count)
+{
+ return receive_credits <= (smb_direct_receive_credit_max >> 3) &&
+ avail_recvmsg_count >= (receive_credits >> 2);
+}
+
+static struct
+smb_direct_recvmsg *get_free_recvmsg(struct smb_direct_transport *t)
+{
+ struct smb_direct_recvmsg *recvmsg = NULL;
+
+ spin_lock(&t->recvmsg_queue_lock);
+ if (!list_empty(&t->recvmsg_queue)) {
+ recvmsg = list_first_entry(&t->recvmsg_queue,
+ struct smb_direct_recvmsg,
+ list);
+ list_del(&recvmsg->list);
+ }
+ spin_unlock(&t->recvmsg_queue_lock);
+ return recvmsg;
+}
+
+static void put_recvmsg(struct smb_direct_transport *t,
+ struct smb_direct_recvmsg *recvmsg)
+{
+ ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr,
+ recvmsg->sge.length, DMA_FROM_DEVICE);
+
+ spin_lock(&t->recvmsg_queue_lock);
+ list_add(&recvmsg->list, &t->recvmsg_queue);
+ spin_unlock(&t->recvmsg_queue_lock);
+
+}
+
+static struct
+smb_direct_recvmsg *get_empty_recvmsg(struct smb_direct_transport *t)
+{
+ struct smb_direct_recvmsg *recvmsg = NULL;
+
+ spin_lock(&t->empty_recvmsg_queue_lock);
+ if (!list_empty(&t->empty_recvmsg_queue)) {
+ recvmsg = list_first_entry(
+ &t->empty_recvmsg_queue,
+ struct smb_direct_recvmsg, list);
+ list_del(&recvmsg->list);
+ }
+ spin_unlock(&t->empty_recvmsg_queue_lock);
+ return recvmsg;
+}
+
+static void put_empty_recvmsg(struct smb_direct_transport *t,
+ struct smb_direct_recvmsg *recvmsg)
+{
+ ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr,
+ recvmsg->sge.length, DMA_FROM_DEVICE);
+
+ spin_lock(&t->empty_recvmsg_queue_lock);
+ list_add_tail(&recvmsg->list, &t->empty_recvmsg_queue);
+ spin_unlock(&t->empty_recvmsg_queue_lock);
+}
+
+static void enqueue_reassembly(struct smb_direct_transport *t,
+ struct smb_direct_recvmsg *recvmsg,
+ int data_length)
+{
+ spin_lock(&t->reassembly_queue_lock);
+ list_add_tail(&recvmsg->list, &t->reassembly_queue);
+ t->reassembly_queue_length++;
+ /*
+ * Make sure reassembly_data_length is updated after list and
+ * reassembly_queue_length are updated. On the dequeue side
+ * reassembly_data_length is checked without a lock to determine
+ * if reassembly_queue_length and list is up to date
+ */
+ virt_wmb();
+ t->reassembly_data_length += data_length;
+ spin_unlock(&t->reassembly_queue_lock);
+
+}
+
+static struct smb_direct_recvmsg *get_first_reassembly(
+ struct smb_direct_transport *t)
+{
+ if (!list_empty(&t->reassembly_queue))
+ return list_first_entry(&t->reassembly_queue,
+ struct smb_direct_recvmsg, list);
+ else
+ return NULL;
+}
+
+static void smb_direct_disconnect_rdma_work(struct work_struct *work)
+{
+ struct smb_direct_transport *t =
+ container_of(work, struct smb_direct_transport,
+ disconnect_work);
+
+ if (t->status == SMB_DIRECT_CS_CONNECTED) {
+ t->status = SMB_DIRECT_CS_DISCONNECTING;
+ rdma_disconnect(t->cm_id);
+ }
+}
+
+static void
+smb_direct_disconnect_rdma_connection(struct smb_direct_transport *t)
+{
+ queue_work(smb_direct_wq, &t->disconnect_work);
+}
+
+static void smb_direct_send_immediate_work(struct work_struct *work)
+{
+ struct smb_direct_transport *t = container_of(work,
+ struct smb_direct_transport, send_immediate_work);
+
+ if (t->status != SMB_DIRECT_CS_CONNECTED)
+ return;
+
+ smb_direct_post_send_data(t, NULL, NULL, 0, 0);
+}
+
+static struct smb_direct_transport *alloc_transport(struct rdma_cm_id *cm_id)
+{
+ struct smb_direct_transport *t;
+ struct ksmbd_conn *conn;
+
+ t = kzalloc(sizeof(*t), GFP_KERNEL);
+ if (!t)
+ return NULL;
+
+ t->cm_id = cm_id;
+ cm_id->context = t;
+
+ t->status = SMB_DIRECT_CS_NEW;
+ init_waitqueue_head(&t->wait_status);
+
+ spin_lock_init(&t->reassembly_queue_lock);
+ INIT_LIST_HEAD(&t->reassembly_queue);
+ t->reassembly_data_length = 0;
+ t->reassembly_queue_length = 0;
+ init_waitqueue_head(&t->wait_reassembly_queue);
+ init_waitqueue_head(&t->wait_send_credits);
+ init_waitqueue_head(&t->wait_rw_avail_ops);
+
+ spin_lock_init(&t->receive_credit_lock);
+ spin_lock_init(&t->recvmsg_queue_lock);
+ INIT_LIST_HEAD(&t->recvmsg_queue);
+
+ spin_lock_init(&t->empty_recvmsg_queue_lock);
+ INIT_LIST_HEAD(&t->empty_recvmsg_queue);
+
+ init_waitqueue_head(&t->wait_send_payload_pending);
+ atomic_set(&t->send_payload_pending, 0);
+ init_waitqueue_head(&t->wait_send_pending);
+ atomic_set(&t->send_pending, 0);
+
+ spin_lock_init(&t->lock_new_recv_credits);
+
+ INIT_DELAYED_WORK(&t->post_recv_credits_work,
+ smb_direct_post_recv_credits);
+ INIT_WORK(&t->send_immediate_work, smb_direct_send_immediate_work);
+ INIT_WORK(&t->disconnect_work, smb_direct_disconnect_rdma_work);
+
+ conn = ksmbd_conn_alloc();
+ if (!conn)
+ goto err;
+ conn->transport = KSMBD_TRANS(t);
+ KSMBD_TRANS(t)->conn = conn;
+ KSMBD_TRANS(t)->ops = &ksmbd_smb_direct_transport_ops;
+ return t;
+err:
+ kfree(t);
+ return NULL;
+}
+
+static void free_transport(struct smb_direct_transport *t)
+{
+ struct smb_direct_recvmsg *recvmsg;
+
+ wake_up_interruptible(&t->wait_send_credits);
+
+ ksmbd_debug(RDMA, "wait for all send posted to IB to finish\n");
+ wait_event(t->wait_send_payload_pending,
+ atomic_read(&t->send_payload_pending) == 0);
+ wait_event(t->wait_send_pending,
+ atomic_read(&t->send_pending) == 0);
+
+ cancel_work_sync(&t->disconnect_work);
+ cancel_delayed_work_sync(&t->post_recv_credits_work);
+ cancel_work_sync(&t->send_immediate_work);
+
+ if (t->qp) {
+ ib_drain_qp(t->qp);
+ ib_destroy_qp(t->qp);
+ }
+
+ ksmbd_debug(RDMA, "drain the reassembly queue\n");
+ do {
+ spin_lock(&t->reassembly_queue_lock);
+ recvmsg = get_first_reassembly(t);
+ if (recvmsg) {
+ list_del(&recvmsg->list);
+ spin_unlock(
+ &t->reassembly_queue_lock);
+ put_recvmsg(t, recvmsg);
+ } else
+ spin_unlock(&t->reassembly_queue_lock);
+ } while (recvmsg);
+ t->reassembly_data_length = 0;
+
+ if (t->send_cq)
+ ib_free_cq(t->send_cq);
+ if (t->recv_cq)
+ ib_free_cq(t->recv_cq);
+ if (t->pd)
+ ib_dealloc_pd(t->pd);
+ if (t->cm_id)
+ rdma_destroy_id(t->cm_id);
+
+ smb_direct_destroy_pools(t);
+ ksmbd_conn_free(KSMBD_TRANS(t)->conn);
+ kfree(t);
+}
+
+static struct smb_direct_sendmsg
+*smb_direct_alloc_sendmsg(struct smb_direct_transport *t)
+{
+ struct smb_direct_sendmsg *msg;
+
+ msg = mempool_alloc(t->sendmsg_mempool, GFP_KERNEL);
+ if (!msg)
+ return ERR_PTR(-ENOMEM);
+ msg->transport = t;
+ INIT_LIST_HEAD(&msg->list);
+ msg->num_sge = 0;
+ return msg;
+}
+
+static void smb_direct_free_sendmsg(struct smb_direct_transport *t,
+ struct smb_direct_sendmsg *msg)
+{
+ int i;
+
+ if (msg->num_sge > 0) {
+ ib_dma_unmap_single(t->cm_id->device,
+ msg->sge[0].addr, msg->sge[0].length,
+ DMA_TO_DEVICE);
+ for (i = 1; i < msg->num_sge; i++)
+ ib_dma_unmap_page(t->cm_id->device,
+ msg->sge[i].addr, msg->sge[i].length,
+ DMA_TO_DEVICE);
+ }
+ mempool_free(msg, t->sendmsg_mempool);
+}
+
+static int smb_direct_check_recvmsg(struct smb_direct_recvmsg *recvmsg)
+{
+ switch (recvmsg->type) {
+ case SMB_DIRECT_MSG_DATA_TRANSFER: {
+ struct smb_direct_data_transfer *req =
+ (struct smb_direct_data_transfer *) recvmsg->packet;
+ struct smb2_hdr *hdr = (struct smb2_hdr *) (recvmsg->packet
+ + le32_to_cpu(req->data_offset) - 4);
+ ksmbd_debug(RDMA,
+ "CreditGranted: %u, CreditRequested: %u, DataLength: %u, RemainingDataLength: %u, SMB: %x, Command: %u\n",
+ le16_to_cpu(req->credits_granted),
+ le16_to_cpu(req->credits_requested),
+ req->data_length, req->remaining_data_length,
+ hdr->ProtocolId, hdr->Command);
+ break;
+ }
+ case SMB_DIRECT_MSG_NEGOTIATE_REQ: {
+ struct smb_direct_negotiate_req *req =
+ (struct smb_direct_negotiate_req *)recvmsg->packet;
+ ksmbd_debug(RDMA,
+ "MinVersion: %u, MaxVersion: %u, CreditRequested: %u, MaxSendSize: %u, MaxRecvSize: %u, MaxFragmentedSize: %u\n",
+ le16_to_cpu(req->min_version),
+ le16_to_cpu(req->max_version),
+ le16_to_cpu(req->credits_requested),
+ le32_to_cpu(req->preferred_send_size),
+ le32_to_cpu(req->max_receive_size),
+ le32_to_cpu(req->max_fragmented_size));
+ if (le16_to_cpu(req->min_version) > 0x0100 ||
+ le16_to_cpu(req->max_version) < 0x0100)
+ return -EOPNOTSUPP;
+ if (le16_to_cpu(req->credits_requested) <= 0 ||
+ le32_to_cpu(req->max_receive_size) <= 128 ||
+ le32_to_cpu(req->max_fragmented_size) <=
+ 128*1024)
+ return -ECONNABORTED;
+
+ break;
+ }
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct smb_direct_recvmsg *recvmsg;
+ struct smb_direct_transport *t;
+
+ recvmsg = container_of(wc->wr_cqe, struct smb_direct_recvmsg, cqe);
+ t = recvmsg->transport;
+
+ if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_RECV) {
+ if (wc->status != IB_WC_WR_FLUSH_ERR) {
+ ksmbd_err("Recv error. status='%s (%d)' opcode=%d\n",
+ ib_wc_status_msg(wc->status), wc->status,
+ wc->opcode);
+ smb_direct_disconnect_rdma_connection(t);
+ }
+ put_empty_recvmsg(t, recvmsg);
+ return;
+ }
+
+ ksmbd_debug(RDMA, "Recv completed. status='%s (%d)', opcode=%d\n",
+ ib_wc_status_msg(wc->status), wc->status,
+ wc->opcode);
+
+ ib_dma_sync_single_for_cpu(wc->qp->device, recvmsg->sge.addr,
+ recvmsg->sge.length, DMA_FROM_DEVICE);
+
+ switch (recvmsg->type) {
+ case SMB_DIRECT_MSG_NEGOTIATE_REQ:
+ t->negotiation_requested = true;
+ t->full_packet_received = true;
+ wake_up_interruptible(&t->wait_status);
+ break;
+ case SMB_DIRECT_MSG_DATA_TRANSFER: {
+ struct smb_direct_data_transfer *data_transfer =
+ (struct smb_direct_data_transfer *)recvmsg->packet;
+ int data_length = le32_to_cpu(data_transfer->data_length);
+ int avail_recvmsg_count, receive_credits;
+
+ if (data_length) {
+ if (t->full_packet_received)
+ recvmsg->first_segment = true;
+
+ if (le32_to_cpu(data_transfer->remaining_data_length))
+ t->full_packet_received = false;
+ else
+ t->full_packet_received = true;
+
+ enqueue_reassembly(t, recvmsg, data_length);
+ wake_up_interruptible(&t->wait_reassembly_queue);
+
+ spin_lock(&t->receive_credit_lock);
+ receive_credits = --(t->recv_credits);
+ avail_recvmsg_count = t->count_avail_recvmsg;
+ spin_unlock(&t->receive_credit_lock);
+ } else {
+ put_empty_recvmsg(t, recvmsg);
+
+ spin_lock(&t->receive_credit_lock);
+ receive_credits = --(t->recv_credits);
+ avail_recvmsg_count = ++(t->count_avail_recvmsg);
+ spin_unlock(&t->receive_credit_lock);
+ }
+
+ t->recv_credit_target =
+ le16_to_cpu(data_transfer->credits_requested);
+ atomic_add(le16_to_cpu(data_transfer->credits_granted),
+ &t->send_credits);
+
+ if (le16_to_cpu(data_transfer->flags) &
+ SMB_DIRECT_RESPONSE_REQUESTED)
+ queue_work(smb_direct_wq, &t->send_immediate_work);
+
+ if (atomic_read(&t->send_credits) > 0)
+ wake_up_interruptible(&t->wait_send_credits);
+
+ if (is_receive_credit_post_required(receive_credits,
+ avail_recvmsg_count))
+ mod_delayed_work(smb_direct_wq,
+ &t->post_recv_credits_work, 0);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+static int smb_direct_post_recv(struct smb_direct_transport *t,
+ struct smb_direct_recvmsg *recvmsg)
+{
+ struct ib_recv_wr wr;
+ int ret;
+
+ recvmsg->sge.addr = ib_dma_map_single(t->cm_id->device,
+ recvmsg->packet, t->max_recv_size,
+ DMA_FROM_DEVICE);
+ ret = ib_dma_mapping_error(t->cm_id->device, recvmsg->sge.addr);
+ if (ret)
+ return ret;
+ recvmsg->sge.length = t->max_recv_size;
+ recvmsg->sge.lkey = t->pd->local_dma_lkey;
+ recvmsg->cqe.done = recv_done;
+
+ wr.wr_cqe = &recvmsg->cqe;
+ wr.next = NULL;
+ wr.sg_list = &recvmsg->sge;
+ wr.num_sge = 1;
+
+ ret = ib_post_recv(t->qp, &wr, NULL);
+ if (ret) {
+ ksmbd_err("Can't post recv: %d\n", ret);
+ ib_dma_unmap_single(t->cm_id->device,
+ recvmsg->sge.addr, recvmsg->sge.length,
+ DMA_FROM_DEVICE);
+ smb_direct_disconnect_rdma_connection(t);
+ return ret;
+ }
+ return ret;
+}
+
+static int smb_direct_read(struct ksmbd_transport *t, char *buf,
+ unsigned int size)
+{
+ struct smb_direct_recvmsg *recvmsg;
+ struct smb_direct_data_transfer *data_transfer;
+ int to_copy, to_read, data_read, offset;
+ u32 data_length, remaining_data_length, data_offset;
+ int rc;
+ struct smb_direct_transport *st = SMB_DIRECT_TRANS(t);
+
+again:
+ if (st->status != SMB_DIRECT_CS_CONNECTED) {
+ ksmbd_err("disconnected\n");
+ return -ENOTCONN;
+ }
+
+ /*
+ * No need to hold the reassembly queue lock all the time as we are
+ * the only one reading from the front of the queue. The transport
+ * may add more entries to the back of the queue at the same time
+ */
+ if (st->reassembly_data_length >= size) {
+ int queue_length;
+ int queue_removed = 0;
+
+ /*
+ * Need to make sure reassembly_data_length is read before
+ * reading reassembly_queue_length and calling
+ * get_first_reassembly. This call is lock free
+ * as we never read at the end of the queue which are being
+ * updated in SOFTIRQ as more data is received
+ */
+ virt_rmb();
+ queue_length = st->reassembly_queue_length;
+ data_read = 0;
+ to_read = size;
+ offset = st->first_entry_offset;
+ while (data_read < size) {
+ recvmsg = get_first_reassembly(st);
+ data_transfer = smb_direct_recvmsg_payload(recvmsg);
+ data_length = le32_to_cpu(data_transfer->data_length);
+ remaining_data_length =
+ le32_to_cpu(
+ data_transfer->remaining_data_length);
+ data_offset = le32_to_cpu(data_transfer->data_offset);
+
+ /*
+ * The upper layer expects RFC1002 length at the
+ * beginning of the payload. Return it to indicate
+ * the total length of the packet. This minimize the
+ * change to upper layer packet processing logic. This
+ * will be eventually remove when an intermediate
+ * transport layer is added
+ */
+ if (recvmsg->first_segment && size == 4) {
+ unsigned int rfc1002_len =
+ data_length + remaining_data_length;
+ *((__be32 *)buf) = cpu_to_be32(rfc1002_len);
+ data_read = 4;
+ recvmsg->first_segment = false;
+ ksmbd_debug(RDMA,
+ "returning rfc1002 length %d\n",
+ rfc1002_len);
+ goto read_rfc1002_done;
+ }
+
+ to_copy = min_t(int, data_length - offset, to_read);
+ memcpy(
+ buf + data_read,
+ (char *)data_transfer + data_offset + offset,
+ to_copy);
+
+ /* move on to the next buffer? */
+ if (to_copy == data_length - offset) {
+ queue_length--;
+ /*
+ * No need to lock if we are not at the
+ * end of the queue
+ */
+ if (queue_length)
+ list_del(&recvmsg->list);
+ else {
+ spin_lock_irq(
+ &st->reassembly_queue_lock);
+ list_del(&recvmsg->list);
+ spin_unlock_irq(
+ &st->reassembly_queue_lock);
+ }
+ queue_removed++;
+ put_recvmsg(st, recvmsg);
+ offset = 0;
+ } else
+ offset += to_copy;
+
+ to_read -= to_copy;
+ data_read += to_copy;
+ }
+
+ spin_lock_irq(&st->reassembly_queue_lock);
+ st->reassembly_data_length -= data_read;
+ st->reassembly_queue_length -= queue_removed;
+ spin_unlock_irq(&st->reassembly_queue_lock);
+
+ spin_lock(&st->receive_credit_lock);
+ st->count_avail_recvmsg += queue_removed;
+ if (is_receive_credit_post_required(st->recv_credits,
+ st->count_avail_recvmsg)) {
+ spin_unlock(&st->receive_credit_lock);
+ mod_delayed_work(smb_direct_wq,
+ &st->post_recv_credits_work, 0);
+ } else
+ spin_unlock(&st->receive_credit_lock);
+
+ st->first_entry_offset = offset;
+ ksmbd_debug(RDMA,
+ "returning to thread data_read=%d reassembly_data_length=%d first_entry_offset=%d\n",
+ data_read, st->reassembly_data_length,
+ st->first_entry_offset);
+read_rfc1002_done:
+ return data_read;
+ }
+
+ ksmbd_debug(RDMA, "wait_event on more data\n");
+ rc = wait_event_interruptible(
+ st->wait_reassembly_queue,
+ st->reassembly_data_length >= size ||
+ st->status != SMB_DIRECT_CS_CONNECTED);
+ if (rc)
+ return -EINTR;
+
+ goto again;
+}
+
+static void smb_direct_post_recv_credits(struct work_struct *work)
+{
+ struct smb_direct_transport *t = container_of(work,
+ struct smb_direct_transport, post_recv_credits_work.work);
+ struct smb_direct_recvmsg *recvmsg;
+ int receive_credits, credits = 0;
+ int ret;
+ int use_free = 1;
+
+ spin_lock(&t->receive_credit_lock);
+ receive_credits = t->recv_credits;
+ spin_unlock(&t->receive_credit_lock);
+
+ if (receive_credits < t->recv_credit_target) {
+ while (true) {
+ if (use_free)
+ recvmsg = get_free_recvmsg(t);
+ else
+ recvmsg = get_empty_recvmsg(t);
+ if (!recvmsg) {
+ if (use_free) {
+ use_free = 0;
+ continue;
+ } else
+ break;
+ }
+
+ recvmsg->type = SMB_DIRECT_MSG_DATA_TRANSFER;
+ recvmsg->first_segment = false;
+
+ ret = smb_direct_post_recv(t, recvmsg);
+ if (ret) {
+ ksmbd_err("Can't post recv: %d\n", ret);
+ put_recvmsg(t, recvmsg);
+ break;
+ }
+ credits++;
+ }
+ }
+
+ spin_lock(&t->receive_credit_lock);
+ t->recv_credits += credits;
+ t->count_avail_recvmsg -= credits;
+ spin_unlock(&t->receive_credit_lock);
+
+ spin_lock(&t->lock_new_recv_credits);
+ t->new_recv_credits += credits;
+ spin_unlock(&t->lock_new_recv_credits);
+
+ if (credits)
+ queue_work(smb_direct_wq, &t->send_immediate_work);
+}
+
+static void send_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ struct smb_direct_sendmsg *sendmsg, *sibling;
+ struct smb_direct_transport *t;
+ struct list_head *pos, *prev, *end;
+
+ sendmsg = container_of(wc->wr_cqe, struct smb_direct_sendmsg, cqe);
+ t = sendmsg->transport;
+
+ ksmbd_debug(RDMA, "Send completed. status='%s (%d)', opcode=%d\n",
+ ib_wc_status_msg(wc->status), wc->status,
+ wc->opcode);
+
+ if (wc->status != IB_WC_SUCCESS || wc->opcode != IB_WC_SEND) {
+ ksmbd_err("Send error. status='%s (%d)', opcode=%d\n",
+ ib_wc_status_msg(wc->status), wc->status,
+ wc->opcode);
+ smb_direct_disconnect_rdma_connection(t);
+ }
+
+ if (sendmsg->num_sge > 1) {
+ if (atomic_dec_and_test(&t->send_payload_pending))
+ wake_up(&t->wait_send_payload_pending);
+ } else {
+ if (atomic_dec_and_test(&t->send_pending))
+ wake_up(&t->wait_send_pending);
+ }
+
+ /* iterate and free the list of messages in reverse. the list's head
+ * is invalid.
+ */
+ for (pos = &sendmsg->list, prev = pos->prev, end = sendmsg->list.next;
+ prev != end; pos = prev, prev = prev->prev) {
+ sibling = container_of(pos, struct smb_direct_sendmsg, list);
+ smb_direct_free_sendmsg(t, sibling);
+ }
+
+ sibling = container_of(pos, struct smb_direct_sendmsg, list);
+ smb_direct_free_sendmsg(t, sibling);
+}
+
+static int manage_credits_prior_sending(struct smb_direct_transport *t)
+{
+ int new_credits;
+
+ spin_lock(&t->lock_new_recv_credits);
+ new_credits = t->new_recv_credits;
+ t->new_recv_credits = 0;
+ spin_unlock(&t->lock_new_recv_credits);
+
+ return new_credits;
+}
+
+static int smb_direct_post_send(struct smb_direct_transport *t,
+ struct ib_send_wr *wr)
+{
+ int ret;
+
+ if (wr->num_sge > 1)
+ atomic_inc(&t->send_payload_pending);
+ else
+ atomic_inc(&t->send_pending);
+
+ ret = ib_post_send(t->qp, wr, NULL);
+ if (ret) {
+ ksmbd_err("failed to post send: %d\n", ret);
+ if (wr->num_sge > 1) {
+ if (atomic_dec_and_test(&t->send_payload_pending))
+ wake_up(&t->wait_send_payload_pending);
+ } else {
+ if (atomic_dec_and_test(&t->send_pending))
+ wake_up(&t->wait_send_pending);
+ }
+ smb_direct_disconnect_rdma_connection(t);
+ }
+ return ret;
+}
+
+static void smb_direct_send_ctx_init(struct smb_direct_transport *t,
+ struct smb_direct_send_ctx *send_ctx,
+ bool need_invalidate_rkey, unsigned int remote_key)
+{
+ INIT_LIST_HEAD(&send_ctx->msg_list);
+ send_ctx->wr_cnt = 0;
+ send_ctx->need_invalidate_rkey = need_invalidate_rkey;
+ send_ctx->remote_key = remote_key;
+}
+
+static int smb_direct_flush_send_list(struct smb_direct_transport *t,
+ struct smb_direct_send_ctx *send_ctx, bool is_last)
+{
+ struct smb_direct_sendmsg *first, *last;
+ int ret;
+
+ if (list_empty(&send_ctx->msg_list))
+ return 0;
+
+ first = list_first_entry(&send_ctx->msg_list,
+ struct smb_direct_sendmsg,
+ list);
+ last = list_last_entry(&send_ctx->msg_list,
+ struct smb_direct_sendmsg,
+ list);
+
+ last->wr.send_flags = IB_SEND_SIGNALED;
+ last->wr.wr_cqe = &last->cqe;
+ if (is_last && send_ctx->need_invalidate_rkey) {
+ last->wr.opcode = IB_WR_SEND_WITH_INV;
+ last->wr.ex.invalidate_rkey = send_ctx->remote_key;
+ }
+
+ ret = smb_direct_post_send(t, &first->wr);
+ if (!ret) {
+ smb_direct_send_ctx_init(t, send_ctx,
+ send_ctx->need_invalidate_rkey, send_ctx->remote_key);
+ } else {
+ atomic_add(send_ctx->wr_cnt, &t->send_credits);
+ wake_up(&t->wait_send_credits);
+ list_for_each_entry_safe(first, last, &send_ctx->msg_list,
+ list) {
+ smb_direct_free_sendmsg(t, first);
+ }
+ }
+ return ret;
+}
+
+static int wait_for_credits(struct smb_direct_transport *t,
+ wait_queue_head_t *waitq, atomic_t *credits)
+{
+ int ret;
+
+ do {
+ if (atomic_dec_return(credits) >= 0)
+ return 0;
+
+ atomic_inc(credits);
+ ret = wait_event_interruptible(*waitq,
+ atomic_read(credits) > 0 ||
+ t->status != SMB_DIRECT_CS_CONNECTED);
+
+ if (t->status != SMB_DIRECT_CS_CONNECTED)
+ return -ENOTCONN;
+ else if (ret < 0)
+ return ret;
+ } while (true);
+}
+
+static int wait_for_send_credits(struct smb_direct_transport *t,
+ struct smb_direct_send_ctx *send_ctx)
+{
+ int ret;
+
+ if (send_ctx && (send_ctx->wr_cnt >= 16 ||
+ atomic_read(&t->send_credits) <= 1)) {
+ ret = smb_direct_flush_send_list(t, send_ctx, false);
+ if (ret)
+ return ret;
+ }
+
+ return wait_for_credits(t, &t->wait_send_credits, &t->send_credits);
+}
+
+static int smb_direct_create_header(struct smb_direct_transport *t,
+ int size, int remaining_data_length,
+ struct smb_direct_sendmsg **sendmsg_out)
+{
+ struct smb_direct_sendmsg *sendmsg;
+ struct smb_direct_data_transfer *packet;
+ int header_length;
+ int ret;
+
+ sendmsg = smb_direct_alloc_sendmsg(t);
+ if (IS_ERR(sendmsg))
+ return PTR_ERR(sendmsg);
+
+ /* Fill in the packet header */
+ packet = (struct smb_direct_data_transfer *)sendmsg->packet;
+ packet->credits_requested = cpu_to_le16(t->send_credit_target);
+ packet->credits_granted = cpu_to_le16(manage_credits_prior_sending(t));
+
+ packet->flags = 0;
+ packet->reserved = 0;
+ if (!size)
+ packet->data_offset = 0;
+ else
+ packet->data_offset = cpu_to_le32(24);
+ packet->data_length = cpu_to_le32(size);
+ packet->remaining_data_length = cpu_to_le32(remaining_data_length);
+ packet->padding = 0;
+
+ ksmbd_debug(RDMA,
+ "credits_requested=%d credits_granted=%d data_offset=%d data_length=%d remaining_data_length=%d\n",
+ le16_to_cpu(packet->credits_requested),
+ le16_to_cpu(packet->credits_granted),
+ le32_to_cpu(packet->data_offset),
+ le32_to_cpu(packet->data_length),
+ le32_to_cpu(packet->remaining_data_length));
+
+ /* Map the packet to DMA */
+ header_length = sizeof(struct smb_direct_data_transfer);
+ /* If this is a packet without payload, don't send padding */
+ if (!size)
+ header_length =
+ offsetof(struct smb_direct_data_transfer, padding);
+
+ sendmsg->sge[0].addr = ib_dma_map_single(t->cm_id->device,
+ (void *)packet,
+ header_length,
+ DMA_TO_DEVICE);
+ ret = ib_dma_mapping_error(t->cm_id->device, sendmsg->sge[0].addr);
+ if (ret) {
+ smb_direct_free_sendmsg(t, sendmsg);
+ return ret;
+ }
+
+ sendmsg->num_sge = 1;
+ sendmsg->sge[0].length = header_length;
+ sendmsg->sge[0].lkey = t->pd->local_dma_lkey;
+
+ *sendmsg_out = sendmsg;
+ return 0;
+}
+
+static int get_sg_list(void *buf, int size,
+ struct scatterlist *sg_list, int nentries)
+{
+ bool high = is_vmalloc_addr(buf);
+ struct page *page;
+ int offset, len;
+ int i = 0;
+
+ if (nentries < BUFFER_NR_PAGES(buf, size))
+ return -EINVAL;
+
+ offset = offset_in_page(buf);
+ buf -= offset;
+ while (size > 0) {
+ len = min_t(int, PAGE_SIZE - offset, size);
+ if (high)
+ page = vmalloc_to_page(buf);
+ else
+ page = kmap_to_page(buf);
+
+ if (!sg_list)
+ return -EINVAL;
+ sg_set_page(sg_list, page, len, offset);
+ sg_list = sg_next(sg_list);
+
+ buf += PAGE_SIZE;
+ size -= len;
+ offset = 0;
+ i++;
+ }
+ return i;
+}
+
+static int get_mapped_sg_list(struct ib_device *device, void *buf, int size,
+ struct scatterlist *sg_list, int nentries,
+ enum dma_data_direction dir)
+{
+ int npages;
+
+ npages = get_sg_list(buf, size, sg_list, nentries);
+ if (npages <= 0)
+ return -EINVAL;
+ return ib_dma_map_sg(device, sg_list, npages, dir);
+}
+
+static int post_sendmsg(struct smb_direct_transport *t,
+ struct smb_direct_send_ctx *send_ctx,
+ struct smb_direct_sendmsg *msg)
+{
+ int i;
+
+ for (i = 0; i < msg->num_sge; i++)
+ ib_dma_sync_single_for_device(t->cm_id->device,
+ msg->sge[i].addr, msg->sge[i].length,
+ DMA_TO_DEVICE);
+
+ msg->cqe.done = send_done;
+ msg->wr.opcode = IB_WR_SEND;
+ msg->wr.sg_list = &msg->sge[0];
+ msg->wr.num_sge = msg->num_sge;
+ msg->wr.next = NULL;
+
+ if (send_ctx) {
+ msg->wr.wr_cqe = NULL;
+ msg->wr.send_flags = 0;
+ if (!list_empty(&send_ctx->msg_list)) {
+ struct smb_direct_sendmsg *last;
+
+ last = list_last_entry(&send_ctx->msg_list,
+ struct smb_direct_sendmsg,
+ list);
+ last->wr.next = &msg->wr;
+ }
+ list_add_tail(&msg->list, &send_ctx->msg_list);
+ send_ctx->wr_cnt++;
+ return 0;
+ }
+
+ msg->wr.wr_cqe = &msg->cqe;
+ msg->wr.send_flags = IB_SEND_SIGNALED;
+ return smb_direct_post_send(t, &msg->wr);
+}
+
+static int smb_direct_post_send_data(struct smb_direct_transport *t,
+ struct smb_direct_send_ctx *send_ctx,
+ struct kvec *iov, int niov, int remaining_data_length)
+{
+ int i, j, ret;
+ struct smb_direct_sendmsg *msg;
+ int data_length;
+ struct scatterlist sg[SMB_DIRECT_MAX_SEND_SGES-1];
+
+ ret = wait_for_send_credits(t, send_ctx);
+ if (ret)
+ return ret;
+
+ data_length = 0;
+ for (i = 0; i < niov; i++)
+ data_length += iov[i].iov_len;
+
+ ret = smb_direct_create_header(t, data_length, remaining_data_length,
+ &msg);
+ if (ret) {
+ atomic_inc(&t->send_credits);
+ return ret;
+ }
+
+ for (i = 0; i < niov; i++) {
+ struct ib_sge *sge;
+ int sg_cnt;
+
+ sg_init_table(sg, SMB_DIRECT_MAX_SEND_SGES-1);
+ sg_cnt = get_mapped_sg_list(t->cm_id->device,
+ iov[i].iov_base, iov[i].iov_len,
+ sg, SMB_DIRECT_MAX_SEND_SGES-1, DMA_TO_DEVICE);
+ if (sg_cnt <= 0) {
+ ksmbd_err("failed to map buffer\n");
+ ret = -ENOMEM;
+ goto err;
+ } else if (sg_cnt + msg->num_sge > SMB_DIRECT_MAX_SEND_SGES-1) {
+ ksmbd_err("buffer not fitted into sges\n");
+ ret = -E2BIG;
+ ib_dma_unmap_sg(t->cm_id->device, sg, sg_cnt,
+ DMA_TO_DEVICE);
+ goto err;
+ }
+
+ for (j = 0; j < sg_cnt; j++) {
+ sge = &msg->sge[msg->num_sge];
+ sge->addr = sg_dma_address(&sg[j]);
+ sge->length = sg_dma_len(&sg[j]);
+ sge->lkey = t->pd->local_dma_lkey;
+ msg->num_sge++;
+ }
+ }
+
+ ret = post_sendmsg(t, send_ctx, msg);
+ if (ret)
+ goto err;
+ return 0;
+err:
+ smb_direct_free_sendmsg(t, msg);
+ atomic_inc(&t->send_credits);
+ return ret;
+}
+
+static int smb_direct_writev(struct ksmbd_transport *t,
+ struct kvec *iov, int niovs, int buflen,
+ bool need_invalidate, unsigned int remote_key)
+{
+ struct smb_direct_transport *st = SMB_DIRECT_TRANS(t);
+ int remaining_data_length;
+ int start, i, j;
+ int max_iov_size = st->max_send_size -
+ sizeof(struct smb_direct_data_transfer);
+ int ret;
+ struct kvec vec;
+ struct smb_direct_send_ctx send_ctx;
+
+ if (st->status != SMB_DIRECT_CS_CONNECTED) {
+ ret = -ENOTCONN;
+ goto done;
+ }
+
+ //FIXME: skip RFC1002 header..
+ buflen -= 4;
+ iov[0].iov_base += 4;
+ iov[0].iov_len -= 4;
+
+ remaining_data_length = buflen;
+ ksmbd_debug(RDMA, "Sending smb (RDMA): smb_len=%u\n", buflen);
+
+ smb_direct_send_ctx_init(st, &send_ctx, need_invalidate, remote_key);
+ start = i = 0;
+ buflen = 0;
+ while (true) {
+ buflen += iov[i].iov_len;
+ if (buflen > max_iov_size) {
+ if (i > start) {
+ remaining_data_length -=
+ (buflen-iov[i].iov_len);
+ ret = smb_direct_post_send_data(st, &send_ctx,
+ &iov[start], i-start,
+ remaining_data_length);
+ if (ret)
+ goto done;
+ } else {
+ /* iov[start] is too big, break it */
+ int nvec = (buflen+max_iov_size-1) /
+ max_iov_size;
+
+ for (j = 0; j < nvec; j++) {
+ vec.iov_base =
+ (char *)iov[start].iov_base +
+ j*max_iov_size;
+ vec.iov_len =
+ min_t(int, max_iov_size,
+ buflen - max_iov_size*j);
+ remaining_data_length -= vec.iov_len;
+ ret = smb_direct_post_send_data(st,
+ &send_ctx, &vec, 1,
+ remaining_data_length);
+ if (ret)
+ goto done;
+ }
+ i++;
+ if (i == niovs)
+ break;
+ }
+ start = i;
+ buflen = 0;
+ } else {
+ i++;
+ if (i == niovs) {
+ /* send out all remaining vecs */
+ remaining_data_length -= buflen;
+ ret = smb_direct_post_send_data(st, &send_ctx,
+ &iov[start], i-start,
+ remaining_data_length);
+ if (ret)
+ goto done;
+ break;
+ }
+ }
+ }
+
+done:
+ ret = smb_direct_flush_send_list(st, &send_ctx, true);
+
+ /*
+ * As an optimization, we don't wait for individual I/O to finish
+ * before sending the next one.
+ * Send them all and wait for pending send count to get to 0
+ * that means all the I/Os have been out and we are good to return
+ */
+
+ wait_event(st->wait_send_payload_pending,
+ atomic_read(&st->send_payload_pending) == 0);
+ return ret;
+}
+
+static void read_write_done(struct ib_cq *cq, struct ib_wc *wc,
+ enum dma_data_direction dir)
+{
+ struct smb_direct_rdma_rw_msg *msg = container_of(wc->wr_cqe,
+ struct smb_direct_rdma_rw_msg, cqe);
+ struct smb_direct_transport *t = msg->t;
+
+ if (wc->status != IB_WC_SUCCESS) {
+ ksmbd_err("read/write error. opcode = %d, status = %s(%d)\n",
+ wc->opcode, ib_wc_status_msg(wc->status), wc->status);
+ smb_direct_disconnect_rdma_connection(t);
+ }
+
+ if (atomic_inc_return(&t->rw_avail_ops) > 0)
+ wake_up(&t->wait_rw_avail_ops);
+
+ rdma_rw_ctx_destroy(&msg->rw_ctx, t->qp, t->qp->port,
+ msg->sg_list, msg->sgt.nents, dir);
+ sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE);
+ complete(msg->completion);
+ kfree(msg);
+}
+
+static void read_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ read_write_done(cq, wc, DMA_FROM_DEVICE);
+}
+
+static void write_done(struct ib_cq *cq, struct ib_wc *wc)
+{
+ read_write_done(cq, wc, DMA_TO_DEVICE);
+}
+
+static int smb_direct_rdma_xmit(struct smb_direct_transport *t, void *buf,
+ int buf_len, u32 remote_key, u64 remote_offset, u32 remote_len,
+ bool is_read)
+{
+ struct smb_direct_rdma_rw_msg *msg;
+ int ret;
+ DECLARE_COMPLETION_ONSTACK(completion);
+ struct ib_send_wr *first_wr = NULL;
+
+ ret = wait_for_credits(t, &t->wait_rw_avail_ops, &t->rw_avail_ops);
+ if (ret < 0)
+ return ret;
+
+ /* TODO: mempool */
+ msg = kmalloc(offsetof(struct smb_direct_rdma_rw_msg, sg_list) +
+ sizeof(struct scatterlist) * SG_CHUNK_SIZE, GFP_KERNEL);
+ if (!msg) {
+ atomic_inc(&t->rw_avail_ops);
+ return -ENOMEM;
+ }
+
+ msg->sgt.sgl = &msg->sg_list[0];
+ ret = sg_alloc_table_chained(&msg->sgt,
+ BUFFER_NR_PAGES(buf, buf_len),
+ msg->sg_list, SG_CHUNK_SIZE);
+ if (ret) {
+ atomic_inc(&t->rw_avail_ops);
+ kfree(msg);
+ return -ENOMEM;
+ }
+
+ ret = get_sg_list(buf, buf_len, msg->sgt.sgl, msg->sgt.orig_nents);
+ if (ret <= 0) {
+ ksmbd_err("failed to get pages\n");
+ goto err;
+ }
+
+ ret = rdma_rw_ctx_init(&msg->rw_ctx, t->qp, t->qp->port,
+ msg->sg_list, BUFFER_NR_PAGES(buf, buf_len),
+ 0, remote_offset, remote_key,
+ is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+ if (ret < 0) {
+ ksmbd_err("failed to init rdma_rw_ctx: %d\n", ret);
+ goto err;
+ }
+
+ msg->t = t;
+ msg->cqe.done = is_read ? read_done : write_done;
+ msg->completion = &completion;
+ first_wr = rdma_rw_ctx_wrs(&msg->rw_ctx, t->qp, t->qp->port,
+ &msg->cqe, NULL);
+
+ ret = ib_post_send(t->qp, first_wr, NULL);
+ if (ret) {
+ ksmbd_err("failed to post send wr: %d\n", ret);
+ goto err;
+ }
+
+ wait_for_completion(&completion);
+ return 0;
+
+err:
+ atomic_inc(&t->rw_avail_ops);
+ if (first_wr)
+ rdma_rw_ctx_destroy(&msg->rw_ctx, t->qp, t->qp->port,
+ msg->sg_list, msg->sgt.nents,
+ is_read ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
+ sg_free_table_chained(&msg->sgt, SG_CHUNK_SIZE);
+ kfree(msg);
+ return ret;
+
+}
+
+static int smb_direct_rdma_write(struct ksmbd_transport *t,
+ void *buf, unsigned int buflen,
+ u32 remote_key, u64 remote_offset,
+ u32 remote_len)
+{
+ return smb_direct_rdma_xmit(SMB_DIRECT_TRANS(t), buf, buflen,
+ remote_key, remote_offset,
+ remote_len, false);
+}
+
+static int smb_direct_rdma_read(struct ksmbd_transport *t,
+ void *buf, unsigned int buflen,
+ u32 remote_key, u64 remote_offset,
+ u32 remote_len)
+{
+ return smb_direct_rdma_xmit(SMB_DIRECT_TRANS(t), buf, buflen,
+ remote_key, remote_offset,
+ remote_len, true);
+}
+
+static void smb_direct_disconnect(struct ksmbd_transport *t)
+{
+ struct smb_direct_transport *st = SMB_DIRECT_TRANS(t);
+
+ ksmbd_debug(RDMA, "Disconnecting cm_id=%p\n", st->cm_id);
+
+ smb_direct_disconnect_rdma_connection(st);
+ wait_event_interruptible(st->wait_status,
+ st->status == SMB_DIRECT_CS_DISCONNECTED);
+ free_transport(st);
+}
+
+static int smb_direct_cm_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ struct smb_direct_transport *t = cm_id->context;
+
+ ksmbd_debug(RDMA, "RDMA CM event. cm_id=%p event=%s (%d)\n",
+ cm_id, rdma_event_msg(event->event), event->event);
+
+ switch (event->event) {
+ case RDMA_CM_EVENT_ESTABLISHED: {
+ t->status = SMB_DIRECT_CS_CONNECTED;
+ wake_up_interruptible(&t->wait_status);
+ break;
+ }
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ case RDMA_CM_EVENT_DISCONNECTED: {
+ t->status = SMB_DIRECT_CS_DISCONNECTED;
+ wake_up_interruptible(&t->wait_status);
+ wake_up_interruptible(&t->wait_reassembly_queue);
+ wake_up(&t->wait_send_credits);
+ break;
+ }
+ case RDMA_CM_EVENT_CONNECT_ERROR: {
+ t->status = SMB_DIRECT_CS_DISCONNECTED;
+ wake_up_interruptible(&t->wait_status);
+ break;
+ }
+ default:
+ ksmbd_err("Unexpected RDMA CM event. cm_id=%p, event=%s (%d)\n",
+ cm_id, rdma_event_msg(event->event),
+ event->event);
+ break;
+ }
+ return 0;
+}
+
+static void smb_direct_qpair_handler(struct ib_event *event, void *context)
+{
+ struct smb_direct_transport *t = context;
+
+ ksmbd_debug(RDMA, "Received QP event. cm_id=%p, event=%s (%d)\n",
+ t->cm_id, ib_event_msg(event->event), event->event);
+
+ switch (event->event) {
+ case IB_EVENT_CQ_ERR:
+ case IB_EVENT_QP_FATAL:
+ smb_direct_disconnect_rdma_connection(t);
+ break;
+ default:
+ break;
+ }
+}
+
+static int smb_direct_send_negotiate_response(struct smb_direct_transport *t,
+ int failed)
+{
+ struct smb_direct_sendmsg *sendmsg;
+ struct smb_direct_negotiate_resp *resp;
+ int ret;
+
+ sendmsg = smb_direct_alloc_sendmsg(t);
+ if (IS_ERR(sendmsg))
+ return -ENOMEM;
+
+ resp = (struct smb_direct_negotiate_resp *)sendmsg->packet;
+ if (failed) {
+ memset(resp, 0, sizeof(*resp));
+ resp->min_version = cpu_to_le16(0x0100);
+ resp->max_version = cpu_to_le16(0x0100);
+ resp->status = STATUS_NOT_SUPPORTED;
+ } else {
+ resp->status = STATUS_SUCCESS;
+ resp->min_version = SMB_DIRECT_VERSION_LE;
+ resp->max_version = SMB_DIRECT_VERSION_LE;
+ resp->negotiated_version = SMB_DIRECT_VERSION_LE;
+ resp->reserved = 0;
+ resp->credits_requested =
+ cpu_to_le16(t->send_credit_target);
+ resp->credits_granted = cpu_to_le16(
+ manage_credits_prior_sending(t));
+ resp->max_readwrite_size = cpu_to_le32(t->max_rdma_rw_size);
+ resp->preferred_send_size = cpu_to_le32(t->max_send_size);
+ resp->max_receive_size = cpu_to_le32(t->max_recv_size);
+ resp->max_fragmented_size =
+ cpu_to_le32(t->max_fragmented_recv_size);
+ }
+
+ sendmsg->sge[0].addr = ib_dma_map_single(t->cm_id->device,
+ (void *)resp, sizeof(*resp), DMA_TO_DEVICE);
+ ret = ib_dma_mapping_error(t->cm_id->device,
+ sendmsg->sge[0].addr);
+ if (ret) {
+ smb_direct_free_sendmsg(t, sendmsg);
+ return ret;
+ }
+
+ sendmsg->num_sge = 1;
+ sendmsg->sge[0].length = sizeof(*resp);
+ sendmsg->sge[0].lkey = t->pd->local_dma_lkey;
+
+ ret = post_sendmsg(t, NULL, sendmsg);
+ if (ret) {
+ smb_direct_free_sendmsg(t, sendmsg);
+ return ret;
+ }
+
+ wait_event(t->wait_send_pending,
+ atomic_read(&t->send_pending) == 0);
+ return 0;
+}
+
+static int smb_direct_accept_client(struct smb_direct_transport *t)
+{
+ struct rdma_conn_param conn_param;
+ struct ib_port_immutable port_immutable;
+ u32 ird_ord_hdr[2];
+ int ret;
+
+ memset(&conn_param, 0, sizeof(conn_param));
+ conn_param.initiator_depth = min_t(u8,
+ t->cm_id->device->attrs.max_qp_rd_atom,
+ SMB_DIRECT_CM_INITIATOR_DEPTH);
+ conn_param.responder_resources = 0;
+
+ t->cm_id->device->ops.get_port_immutable(t->cm_id->device,
+ t->cm_id->port_num, &port_immutable);
+ if (port_immutable.core_cap_flags & RDMA_CORE_PORT_IWARP) {
+ ird_ord_hdr[0] = conn_param.responder_resources;
+ ird_ord_hdr[1] = 1;
+ conn_param.private_data = ird_ord_hdr;
+ conn_param.private_data_len = sizeof(ird_ord_hdr);
+ } else {
+ conn_param.private_data = NULL;
+ conn_param.private_data_len = 0;
+ }
+ conn_param.retry_count = SMB_DIRECT_CM_RETRY;
+ conn_param.rnr_retry_count = SMB_DIRECT_CM_RNR_RETRY;
+ conn_param.flow_control = 0;
+
+ ret = rdma_accept(t->cm_id, &conn_param);
+ if (ret) {
+ ksmbd_err("error at rdma_accept: %d\n", ret);
+ return ret;
+ }
+
+ wait_event_interruptible(t->wait_status,
+ t->status != SMB_DIRECT_CS_NEW);
+ if (t->status != SMB_DIRECT_CS_CONNECTED)
+ return -ENOTCONN;
+ return 0;
+}
+
+static int smb_direct_negotiate(struct smb_direct_transport *t)
+{
+ int ret;
+ struct smb_direct_recvmsg *recvmsg;
+ struct smb_direct_negotiate_req *req;
+
+ recvmsg = get_free_recvmsg(t);
+ if (!recvmsg)
+ return -ENOMEM;
+ recvmsg->type = SMB_DIRECT_MSG_NEGOTIATE_REQ;
+
+ ret = smb_direct_post_recv(t, recvmsg);
+ if (ret) {
+ ksmbd_err("Can't post recv: %d\n", ret);
+ goto out;
+ }
+
+ t->negotiation_requested = false;
+ ret = smb_direct_accept_client(t);
+ if (ret) {
+ ksmbd_err("Can't accept client\n");
+ goto out;
+ }
+
+ smb_direct_post_recv_credits(&t->post_recv_credits_work.work);
+
+ ksmbd_debug(RDMA, "Waiting for SMB_DIRECT negotiate request\n");
+ ret = wait_event_interruptible_timeout(t->wait_status,
+ t->negotiation_requested ||
+ t->status == SMB_DIRECT_CS_DISCONNECTED,
+ SMB_DIRECT_NEGOTIATE_TIMEOUT * HZ);
+ if (ret <= 0 || t->status == SMB_DIRECT_CS_DISCONNECTED) {
+ ret = ret < 0 ? ret : -ETIMEDOUT;
+ goto out;
+ }
+
+ ret = smb_direct_check_recvmsg(recvmsg);
+ if (ret == -ECONNABORTED)
+ goto out;
+
+ req = (struct smb_direct_negotiate_req *)recvmsg->packet;
+ t->max_recv_size = min_t(int, t->max_recv_size,
+ le32_to_cpu(req->preferred_send_size));
+ t->max_send_size = min_t(int, t->max_send_size,
+ le32_to_cpu(req->max_receive_size));
+ t->max_fragmented_send_size =
+ le32_to_cpu(req->max_fragmented_size);
+
+ ret = smb_direct_send_negotiate_response(t, ret);
+out:
+ if (recvmsg)
+ put_recvmsg(t, recvmsg);
+ return ret;
+}
+
+static int smb_direct_init_params(struct smb_direct_transport *t,
+ struct ib_qp_cap *cap)
+{
+ struct ib_device *device = t->cm_id->device;
+ int max_send_sges, max_pages, max_rw_wrs, max_send_wrs;
+
+ /* need 2 more sge. because a SMB_DIRECT header will be mapped,
+ * and maybe a send buffer could be not page aligned.
+ */
+ t->max_send_size = smb_direct_max_send_size;
+ max_send_sges = DIV_ROUND_UP(t->max_send_size, PAGE_SIZE) + 2;
+ if (max_send_sges > SMB_DIRECT_MAX_SEND_SGES) {
+ ksmbd_err("max_send_size %d is too large\n", t->max_send_size);
+ return -EINVAL;
+ }
+
+ /*
+ * allow smb_direct_max_outstanding_rw_ops of in-flight RDMA
+ * read/writes. HCA guarantees at least max_send_sge of sges for
+ * a RDMA read/write work request, and if memory registration is used,
+ * we need reg_mr, local_inv wrs for each read/write.
+ */
+ t->max_rdma_rw_size = smb_direct_max_read_write_size;
+ max_pages = DIV_ROUND_UP(t->max_rdma_rw_size, PAGE_SIZE) + 1;
+ max_rw_wrs = DIV_ROUND_UP(max_pages, SMB_DIRECT_MAX_SEND_SGES);
+ max_rw_wrs += rdma_rw_mr_factor(device, t->cm_id->port_num,
+ max_pages) * 2;
+ max_rw_wrs *= smb_direct_max_outstanding_rw_ops;
+
+ max_send_wrs = smb_direct_send_credit_target + max_rw_wrs;
+ if (max_send_wrs > device->attrs.max_cqe ||
+ max_send_wrs > device->attrs.max_qp_wr) {
+ ksmbd_err("consider lowering send_credit_target = %d, or max_outstanding_rw_ops = %d\n",
+ smb_direct_send_credit_target,
+ smb_direct_max_outstanding_rw_ops);
+ ksmbd_err("Possible CQE overrun, device reporting max_cqe %d max_qp_wr %d\n",
+ device->attrs.max_cqe, device->attrs.max_qp_wr);
+ return -EINVAL;
+ }
+
+ if (smb_direct_receive_credit_max > device->attrs.max_cqe ||
+ smb_direct_receive_credit_max > device->attrs.max_qp_wr) {
+ ksmbd_err("consider lowering receive_credit_max = %d\n",
+ smb_direct_receive_credit_max);
+ ksmbd_err("Possible CQE overrun, device reporting max_cpe %d max_qp_wr %d\n",
+ device->attrs.max_cqe, device->attrs.max_qp_wr);
+ return -EINVAL;
+ }
+
+ if (device->attrs.max_send_sge < SMB_DIRECT_MAX_SEND_SGES) {
+ ksmbd_err("warning: device max_send_sge = %d too small\n",
+ device->attrs.max_send_sge);
+ return -EINVAL;
+ }
+ if (device->attrs.max_recv_sge < SMB_DIRECT_MAX_RECV_SGES) {
+ ksmbd_err("warning: device max_recv_sge = %d too small\n",
+ device->attrs.max_recv_sge);
+ return -EINVAL;
+ }
+
+ t->recv_credits = 0;
+ t->count_avail_recvmsg = 0;
+
+ t->recv_credit_max = smb_direct_receive_credit_max;
+ t->recv_credit_target = 10;
+ t->new_recv_credits = 0;
+
+ t->send_credit_target = smb_direct_send_credit_target;
+ atomic_set(&t->send_credits, 0);
+ atomic_set(&t->rw_avail_ops, smb_direct_max_outstanding_rw_ops);
+
+ t->max_send_size = smb_direct_max_send_size;
+ t->max_recv_size = smb_direct_max_receive_size;
+ t->max_fragmented_recv_size = smb_direct_max_fragmented_recv_size;
+
+ cap->max_send_wr = max_send_wrs;
+ cap->max_recv_wr = t->recv_credit_max;
+ cap->max_send_sge = SMB_DIRECT_MAX_SEND_SGES;
+ cap->max_recv_sge = SMB_DIRECT_MAX_RECV_SGES;
+ cap->max_inline_data = 0;
+ cap->max_rdma_ctxs = 0;
+ return 0;
+}
+
+static void smb_direct_destroy_pools(struct smb_direct_transport *t)
+{
+ struct smb_direct_recvmsg *recvmsg;
+
+ while ((recvmsg = get_free_recvmsg(t)))
+ mempool_free(recvmsg, t->recvmsg_mempool);
+ while ((recvmsg = get_empty_recvmsg(t)))
+ mempool_free(recvmsg, t->recvmsg_mempool);
+
+ mempool_destroy(t->recvmsg_mempool);
+ t->recvmsg_mempool = NULL;
+
+ kmem_cache_destroy(t->recvmsg_cache);
+ t->recvmsg_cache = NULL;
+
+ mempool_destroy(t->sendmsg_mempool);
+ t->sendmsg_mempool = NULL;
+
+ kmem_cache_destroy(t->sendmsg_cache);
+ t->sendmsg_cache = NULL;
+}
+
+static int smb_direct_create_pools(struct smb_direct_transport *t)
+{
+ char name[80];
+ int i;
+ struct smb_direct_recvmsg *recvmsg;
+
+ snprintf(name, sizeof(name), "smb_direct_rqst_pool_%p", t);
+ t->sendmsg_cache = kmem_cache_create(name,
+ sizeof(struct smb_direct_sendmsg) +
+ sizeof(struct smb_direct_negotiate_resp),
+ 0, SLAB_HWCACHE_ALIGN, NULL);
+ if (!t->sendmsg_cache)
+ return -ENOMEM;
+
+ t->sendmsg_mempool = mempool_create(t->send_credit_target,
+ mempool_alloc_slab, mempool_free_slab,
+ t->sendmsg_cache);
+ if (!t->sendmsg_mempool)
+ goto err;
+
+ snprintf(name, sizeof(name), "smb_direct_resp_%p", t);
+ t->recvmsg_cache = kmem_cache_create(name,
+ sizeof(struct smb_direct_recvmsg) +
+ t->max_recv_size,
+ 0, SLAB_HWCACHE_ALIGN, NULL);
+ if (!t->recvmsg_cache)
+ goto err;
+
+ t->recvmsg_mempool =
+ mempool_create(t->recv_credit_max, mempool_alloc_slab,
+ mempool_free_slab, t->recvmsg_cache);
+ if (!t->recvmsg_mempool)
+ goto err;
+
+ INIT_LIST_HEAD(&t->recvmsg_queue);
+
+ for (i = 0; i < t->recv_credit_max; i++) {
+ recvmsg = mempool_alloc(t->recvmsg_mempool, GFP_KERNEL);
+ if (!recvmsg)
+ goto err;
+ recvmsg->transport = t;
+ list_add(&recvmsg->list, &t->recvmsg_queue);
+ }
+ t->count_avail_recvmsg = t->recv_credit_max;
+
+ return 0;
+err:
+ smb_direct_destroy_pools(t);
+ return -ENOMEM;
+}
+
+static int smb_direct_create_qpair(struct smb_direct_transport *t,
+ struct ib_qp_cap *cap)
+{
+ int ret;
+ struct ib_qp_init_attr qp_attr;
+
+ t->pd = ib_alloc_pd(t->cm_id->device, 0);
+ if (IS_ERR(t->pd)) {
+ ksmbd_err("Can't create RDMA PD\n");
+ ret = PTR_ERR(t->pd);
+ t->pd = NULL;
+ return ret;
+ }
+
+ t->send_cq = ib_alloc_cq(t->cm_id->device, t,
+ t->send_credit_target, 0, IB_POLL_WORKQUEUE);
+ if (IS_ERR(t->send_cq)) {
+ ksmbd_err("Can't create RDMA send CQ\n");
+ ret = PTR_ERR(t->send_cq);
+ t->send_cq = NULL;
+ goto err;
+ }
+
+ t->recv_cq = ib_alloc_cq(t->cm_id->device, t,
+ cap->max_send_wr + cap->max_rdma_ctxs,
+ 0, IB_POLL_WORKQUEUE);
+ if (IS_ERR(t->recv_cq)) {
+ ksmbd_err("Can't create RDMA recv CQ\n");
+ ret = PTR_ERR(t->recv_cq);
+ t->recv_cq = NULL;
+ goto err;
+ }
+
+ memset(&qp_attr, 0, sizeof(qp_attr));
+ qp_attr.event_handler = smb_direct_qpair_handler;
+ qp_attr.qp_context = t;
+ qp_attr.cap = *cap;
+ qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+ qp_attr.qp_type = IB_QPT_RC;
+ qp_attr.send_cq = t->send_cq;
+ qp_attr.recv_cq = t->recv_cq;
+ qp_attr.port_num = ~0;
+
+ ret = rdma_create_qp(t->cm_id, t->pd, &qp_attr);
+ if (ret) {
+ ksmbd_err("Can't create RDMA QP: %d\n", ret);
+ goto err;
+ }
+
+ t->qp = t->cm_id->qp;
+ t->cm_id->event_handler = smb_direct_cm_handler;
+
+ return 0;
+err:
+ if (t->qp) {
+ ib_destroy_qp(t->qp);
+ t->qp = NULL;
+ }
+ if (t->recv_cq) {
+ ib_destroy_cq(t->recv_cq);
+ t->recv_cq = NULL;
+ }
+ if (t->send_cq) {
+ ib_destroy_cq(t->send_cq);
+ t->send_cq = NULL;
+ }
+ if (t->pd) {
+ ib_dealloc_pd(t->pd);
+ t->pd = NULL;
+ }
+ return ret;
+}
+
+static int smb_direct_prepare(struct ksmbd_transport *t)
+{
+ struct smb_direct_transport *st = SMB_DIRECT_TRANS(t);
+ int ret;
+ struct ib_qp_cap qp_cap;
+
+ ret = smb_direct_init_params(st, &qp_cap);
+ if (ret) {
+ ksmbd_err("Can't configure RDMA parameters\n");
+ return ret;
+ }
+
+ ret = smb_direct_create_pools(st);
+ if (ret) {
+ ksmbd_err("Can't init RDMA pool: %d\n", ret);
+ return ret;
+ }
+
+ ret = smb_direct_create_qpair(st, &qp_cap);
+ if (ret) {
+ ksmbd_err("Can't accept RDMA client: %d\n", ret);
+ return ret;
+ }
+
+ ret = smb_direct_negotiate(st);
+ if (ret) {
+ ksmbd_err("Can't negotiate: %d\n", ret);
+ return ret;
+ }
+
+ st->status = SMB_DIRECT_CS_CONNECTED;
+ return 0;
+}
+
+static bool rdma_frwr_is_supported(struct ib_device_attr *attrs)
+{
+ if (!(attrs->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
+ return false;
+ if (attrs->max_fast_reg_page_list_len == 0)
+ return false;
+ return true;
+}
+
+static int smb_direct_handle_connect_request(struct rdma_cm_id *new_cm_id)
+{
+ struct smb_direct_transport *t;
+
+ if (!rdma_frwr_is_supported(&new_cm_id->device->attrs)) {
+ ksmbd_debug(RDMA,
+ "Fast Registration Work Requests is not supported. device capabilities=%llx\n",
+ new_cm_id->device->attrs.device_cap_flags);
+ return -EPROTONOSUPPORT;
+ }
+
+ t = alloc_transport(new_cm_id);
+ if (!t)
+ return -ENOMEM;
+
+ KSMBD_TRANS(t)->handler = kthread_run(ksmbd_conn_handler_loop,
+ KSMBD_TRANS(t)->conn, "ksmbd:r%u", SMB_DIRECT_PORT);
+ if (IS_ERR(KSMBD_TRANS(t)->handler)) {
+ int ret = PTR_ERR(KSMBD_TRANS(t)->handler);
+
+ ksmbd_err("Can't start thread\n");
+ free_transport(t);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int smb_direct_listen_handler(struct rdma_cm_id *cm_id,
+ struct rdma_cm_event *event)
+{
+ switch (event->event) {
+ case RDMA_CM_EVENT_CONNECT_REQUEST: {
+ int ret = smb_direct_handle_connect_request(cm_id);
+
+ if (ret) {
+ ksmbd_err("Can't create transport: %d\n", ret);
+ return ret;
+ }
+
+ ksmbd_debug(RDMA, "Received connection request. cm_id=%p\n",
+ cm_id);
+ break;
+ }
+ default:
+ ksmbd_err("Unexpected listen event. cm_id=%p, event=%s (%d)\n",
+ cm_id,
+ rdma_event_msg(event->event), event->event);
+ break;
+ }
+ return 0;
+}
+
+static int smb_direct_listen(int port)
+{
+ int ret;
+ struct rdma_cm_id *cm_id;
+ struct sockaddr_in sin = {
+ .sin_family = AF_INET,
+ .sin_addr.s_addr = htonl(INADDR_ANY),
+ .sin_port = htons(port),
+ };
+
+ cm_id = rdma_create_id(&init_net, smb_direct_listen_handler,
+ &smb_direct_listener, RDMA_PS_TCP, IB_QPT_RC);
+ if (IS_ERR(cm_id)) {
+ ksmbd_err("Can't create cm id: %ld\n",
+ PTR_ERR(cm_id));
+ return PTR_ERR(cm_id);
+ }
+
+ ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
+ if (ret) {
+ ksmbd_err("Can't bind: %d\n", ret);
+ goto err;
+ }
+
+ smb_direct_listener.cm_id = cm_id;
+
+ ret = rdma_listen(cm_id, 10);
+ if (ret) {
+ ksmbd_err("Can't listen: %d\n", ret);
+ goto err;
+ }
+ return 0;
+err:
+ smb_direct_listener.cm_id = NULL;
+ rdma_destroy_id(cm_id);
+ return ret;
+}
+
+int ksmbd_rdma_init(void)
+{
+ int ret;
+
+ smb_direct_listener.cm_id = NULL;
+
+ /* When a client is running out of send credits, the credits are
+ * granted by the server's sending a packet using this queue.
+ * This avoids the situation that a clients cannot send packets
+ * for lack of credits
+ */
+ smb_direct_wq = alloc_workqueue("ksmbd-smb_direct-wq",
+ WQ_HIGHPRI|WQ_MEM_RECLAIM, 0);
+ if (!smb_direct_wq)
+ return -ENOMEM;
+
+ ret = smb_direct_listen(SMB_DIRECT_PORT);
+ if (ret) {
+ destroy_workqueue(smb_direct_wq);
+ smb_direct_wq = NULL;
+ ksmbd_err("Can't listen: %d\n", ret);
+ return ret;
+ }
+
+ ksmbd_debug(RDMA, "init RDMA listener. cm_id=%p\n",
+ smb_direct_listener.cm_id);
+ return 0;
+}
+
+int ksmbd_rdma_destroy(void)
+{
+ if (smb_direct_listener.cm_id)
+ rdma_destroy_id(smb_direct_listener.cm_id);
+ smb_direct_listener.cm_id = NULL;
+
+ if (smb_direct_wq) {
+ flush_workqueue(smb_direct_wq);
+ destroy_workqueue(smb_direct_wq);
+ smb_direct_wq = NULL;
+ }
+ return 0;
+}
+
+static struct ksmbd_transport_ops ksmbd_smb_direct_transport_ops = {
+ .prepare = smb_direct_prepare,
+ .disconnect = smb_direct_disconnect,
+ .writev = smb_direct_writev,
+ .read = smb_direct_read,
+ .rdma_read = smb_direct_rdma_read,
+ .rdma_write = smb_direct_rdma_write,
+};
diff --git a/fs/cifsd/transport_rdma.h b/fs/cifsd/transport_rdma.h
new file mode 100644
index 000000000000..da60fcec3ede
--- /dev/null
+++ b/fs/cifsd/transport_rdma.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2017, Microsoft Corporation.
+ * Copyright (C) 2018, LG Electronics.
+ */
+
+#ifndef __KSMBD_TRANSPORT_RDMA_H__
+#define __KSMBD_TRANSPORT_RDMA_H__
+
+#define SMB_DIRECT_PORT 5445
+
+/* SMB DIRECT negotiation request packet [MS-KSMBD] 2.2.1 */
+struct smb_direct_negotiate_req {
+ __le16 min_version;
+ __le16 max_version;
+ __le16 reserved;
+ __le16 credits_requested;
+ __le32 preferred_send_size;
+ __le32 max_receive_size;
+ __le32 max_fragmented_size;
+} __packed;
+
+/* SMB DIRECT negotiation response packet [MS-KSMBD] 2.2.2 */
+struct smb_direct_negotiate_resp {
+ __le16 min_version;
+ __le16 max_version;
+ __le16 negotiated_version;
+ __le16 reserved;
+ __le16 credits_requested;
+ __le16 credits_granted;
+ __le32 status;
+ __le32 max_readwrite_size;
+ __le32 preferred_send_size;
+ __le32 max_receive_size;
+ __le32 max_fragmented_size;
+} __packed;
+
+#define SMB_DIRECT_RESPONSE_REQUESTED 0x0001
+
+/* SMB DIRECT data transfer packet with payload [MS-KSMBD] 2.2.3 */
+struct smb_direct_data_transfer {
+ __le16 credits_requested;
+ __le16 credits_granted;
+ __le16 flags;
+ __le16 reserved;
+ __le32 remaining_data_length;
+ __le32 data_offset;
+ __le32 data_length;
+ __le32 padding;
+ __u8 buffer[];
+} __packed;
+
+#ifdef CONFIG_SMB_SERVER_SMBDIRECT
+int ksmbd_rdma_init(void);
+int ksmbd_rdma_destroy(void);
+#else
+static inline int ksmbd_rdma_init(void) { return 0; }
+static inline int ksmbd_rdma_destroy(void) { return 0; }
+#endif
+
+#endif /* __KSMBD_TRANSPORT_RDMA_H__ */
diff --git a/fs/cifsd/transport_tcp.c b/fs/cifsd/transport_tcp.c
new file mode 100644
index 000000000000..359401227d93
--- /dev/null
+++ b/fs/cifsd/transport_tcp.c
@@ -0,0 +1,625 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/freezer.h>
+
+#include "smb_common.h"
+#include "server.h"
+#include "auth.h"
+#include "buffer_pool.h"
+#include "connection.h"
+#include "transport_tcp.h"
+
+#define IFACE_STATE_DOWN (1 << 0)
+#define IFACE_STATE_CONFIGURED (1 << 1)
+
+struct interface {
+ struct task_struct *ksmbd_kthread;
+ struct socket *ksmbd_socket;
+ struct list_head entry;
+ char *name;
+ struct mutex sock_release_lock;
+ int state;
+};
+
+static LIST_HEAD(iface_list);
+
+static int bind_additional_ifaces;
+
+struct tcp_transport {
+ struct ksmbd_transport transport;
+ struct socket *sock;
+ struct kvec *iov;
+ unsigned int nr_iov;
+};
+
+static struct ksmbd_transport_ops ksmbd_tcp_transport_ops;
+
+static void tcp_stop_kthread(struct task_struct *kthread);
+static struct interface *alloc_iface(char *ifname);
+
+#define KSMBD_TRANS(t) (&(t)->transport)
+#define TCP_TRANS(t) ((struct tcp_transport *)container_of(t, \
+ struct tcp_transport, transport))
+
+static inline void ksmbd_tcp_nodelay(struct socket *sock)
+{
+ tcp_sock_set_nodelay(sock->sk);
+}
+
+static inline void ksmbd_tcp_reuseaddr(struct socket *sock)
+{
+ sock_set_reuseaddr(sock->sk);
+}
+
+static inline void ksmbd_tcp_rcv_timeout(struct socket *sock, s64 secs)
+{
+ lock_sock(sock->sk);
+ if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
+ sock->sk->sk_rcvtimeo = secs * HZ;
+ else
+ sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
+ release_sock(sock->sk);
+}
+
+static inline void ksmbd_tcp_snd_timeout(struct socket *sock, s64 secs)
+{
+ sock_set_sndtimeo(sock->sk, secs);
+}
+
+static struct tcp_transport *alloc_transport(struct socket *client_sk)
+{
+ struct tcp_transport *t;
+ struct ksmbd_conn *conn;
+
+ t = kzalloc(sizeof(*t), GFP_KERNEL);
+ if (!t)
+ return NULL;
+ t->sock = client_sk;
+
+ conn = ksmbd_conn_alloc();
+ if (!conn) {
+ kfree(t);
+ return NULL;
+ }
+
+ conn->transport = KSMBD_TRANS(t);
+ KSMBD_TRANS(t)->conn = conn;
+ KSMBD_TRANS(t)->ops = &ksmbd_tcp_transport_ops;
+ return t;
+}
+
+static void free_transport(struct tcp_transport *t)
+{
+ kernel_sock_shutdown(t->sock, SHUT_RDWR);
+ sock_release(t->sock);
+ t->sock = NULL;
+
+ ksmbd_conn_free(KSMBD_TRANS(t)->conn);
+ kfree(t->iov);
+ kfree(t);
+}
+
+/**
+ * kvec_array_init() - initialize a IO vector segment
+ * @new: IO vector to be initialized
+ * @iov: base IO vector
+ * @nr_segs: number of segments in base iov
+ * @bytes: total iovec length so far for read
+ *
+ * Return: Number of IO segments
+ */
+static unsigned int kvec_array_init(struct kvec *new, struct kvec *iov,
+ unsigned int nr_segs, size_t bytes)
+{
+ size_t base = 0;
+
+ while (bytes || !iov->iov_len) {
+ int copy = min(bytes, iov->iov_len);
+
+ bytes -= copy;
+ base += copy;
+ if (iov->iov_len == base) {
+ iov++;
+ nr_segs--;
+ base = 0;
+ }
+ }
+
+ memcpy(new, iov, sizeof(*iov) * nr_segs);
+ new->iov_base += base;
+ new->iov_len -= base;
+ return nr_segs;
+}
+
+/**
+ * get_conn_iovec() - get connection iovec for reading from socket
+ * @t: TCP transport instance
+ * @nr_segs: number of segments in iov
+ *
+ * Return: return existing or newly allocate iovec
+ */
+static struct kvec *get_conn_iovec(struct tcp_transport *t,
+ unsigned int nr_segs)
+{
+ struct kvec *new_iov;
+
+ if (t->iov && nr_segs <= t->nr_iov)
+ return t->iov;
+
+ /* not big enough -- allocate a new one and release the old */
+ new_iov = kmalloc_array(nr_segs, sizeof(*new_iov), GFP_KERNEL);
+ if (new_iov) {
+ kfree(t->iov);
+ t->iov = new_iov;
+ t->nr_iov = nr_segs;
+ }
+ return new_iov;
+}
+
+static unsigned short ksmbd_tcp_get_port(const struct sockaddr *sa)
+{
+ switch (sa->sa_family) {
+ case AF_INET:
+ return ntohs(((struct sockaddr_in *)sa)->sin_port);
+ case AF_INET6:
+ return ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
+ }
+ return 0;
+}
+
+/**
+ * ksmbd_tcp_new_connection() - create a new tcp session on mount
+ * @client_sk: socket associated with new connection
+ *
+ * whenever a new connection is requested, create a conn thread
+ * (session thread) to handle new incoming smb requests from the connection
+ *
+ * Return: 0 on success, otherwise error
+ */
+static int ksmbd_tcp_new_connection(struct socket *client_sk)
+{
+ struct sockaddr *csin;
+ int rc = 0;
+ struct tcp_transport *t;
+
+ t = alloc_transport(client_sk);
+ if (!t)
+ return -ENOMEM;
+
+ csin = KSMBD_TCP_PEER_SOCKADDR(KSMBD_TRANS(t)->conn);
+ if (kernel_getpeername(client_sk, csin) < 0) {
+ ksmbd_err("client ip resolution failed\n");
+ rc = -EINVAL;
+ goto out_error;
+ }
+
+ KSMBD_TRANS(t)->handler = kthread_run(ksmbd_conn_handler_loop,
+ KSMBD_TRANS(t)->conn,
+ "ksmbd:%u", ksmbd_tcp_get_port(csin));
+ if (IS_ERR(KSMBD_TRANS(t)->handler)) {
+ ksmbd_err("cannot start conn thread\n");
+ rc = PTR_ERR(KSMBD_TRANS(t)->handler);
+ free_transport(t);
+ }
+ return rc;
+
+out_error:
+ free_transport(t);
+ return rc;
+}
+
+/**
+ * ksmbd_kthread_fn() - listen to new SMB connections and callback server
+ * @p: arguments to forker thread
+ *
+ * Return: Returns a task_struct or ERR_PTR
+ */
+static int ksmbd_kthread_fn(void *p)
+{
+ struct socket *client_sk = NULL;
+ struct interface *iface = (struct interface *)p;
+ int ret;
+
+ while (!kthread_should_stop()) {
+ mutex_lock(&iface->sock_release_lock);
+ if (!iface->ksmbd_socket) {
+ mutex_unlock(&iface->sock_release_lock);
+ break;
+ }
+ ret = kernel_accept(iface->ksmbd_socket, &client_sk,
+ O_NONBLOCK);
+ mutex_unlock(&iface->sock_release_lock);
+ if (ret) {
+ if (ret == -EAGAIN)
+ /* check for new connections every 100 msecs */
+ schedule_timeout_interruptible(HZ / 10);
+ continue;
+ }
+
+ ksmbd_debug(CONN, "connect success: accepted new connection\n");
+ client_sk->sk->sk_rcvtimeo = KSMBD_TCP_RECV_TIMEOUT;
+ client_sk->sk->sk_sndtimeo = KSMBD_TCP_SEND_TIMEOUT;
+
+ ksmbd_tcp_new_connection(client_sk);
+ }
+
+ ksmbd_debug(CONN, "releasing socket\n");
+ return 0;
+}
+
+/**
+ * ksmbd_tcp_run_kthread() - start forker thread
+ * @iface: pointer to struct interface
+ *
+ * start forker thread(ksmbd/0) at module init time to listen
+ * on port 445 for new SMB connection requests. It creates per connection
+ * server threads(ksmbd/x)
+ *
+ * Return: 0 on success or error number
+ */
+static int ksmbd_tcp_run_kthread(struct interface *iface)
+{
+ int rc;
+ struct task_struct *kthread;
+
+ kthread = kthread_run(ksmbd_kthread_fn, (void *)iface,
+ "ksmbd-%s", iface->name);
+ if (IS_ERR(kthread)) {
+ rc = PTR_ERR(kthread);
+ return rc;
+ }
+ iface->ksmbd_kthread = kthread;
+
+ return 0;
+}
+
+/**
+ * ksmbd_tcp_readv() - read data from socket in given iovec
+ * @t: TCP transport instance
+ * @iov_orig: base IO vector
+ * @nr_segs: number of segments in base iov
+ * @to_read: number of bytes to read from socket
+ *
+ * Return: on success return number of bytes read from socket,
+ * otherwise return error number
+ */
+static int ksmbd_tcp_readv(struct tcp_transport *t,
+ struct kvec *iov_orig,
+ unsigned int nr_segs,
+ unsigned int to_read)
+{
+ int length = 0;
+ int total_read;
+ unsigned int segs;
+ struct msghdr ksmbd_msg;
+ struct kvec *iov;
+ struct ksmbd_conn *conn = KSMBD_TRANS(t)->conn;
+
+ iov = get_conn_iovec(t, nr_segs);
+ if (!iov)
+ return -ENOMEM;
+
+ ksmbd_msg.msg_control = NULL;
+ ksmbd_msg.msg_controllen = 0;
+
+ for (total_read = 0; to_read; total_read += length, to_read -= length) {
+ try_to_freeze();
+
+ if (!ksmbd_conn_alive(conn)) {
+ total_read = -ESHUTDOWN;
+ break;
+ }
+ segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
+
+ length = kernel_recvmsg(t->sock, &ksmbd_msg,
+ iov, segs, to_read, 0);
+
+ if (length == -EINTR) {
+ total_read = -ESHUTDOWN;
+ break;
+ } else if (conn->status == KSMBD_SESS_NEED_RECONNECT) {
+ total_read = -EAGAIN;
+ break;
+ } else if (length == -ERESTARTSYS || length == -EAGAIN) {
+ usleep_range(1000, 2000);
+ length = 0;
+ continue;
+ } else if (length <= 0) {
+ total_read = -EAGAIN;
+ break;
+ }
+ }
+ return total_read;
+}
+
+/**
+ * ksmbd_tcp_read() - read data from socket in given buffer
+ * @t: TCP transport instance
+ * @buf: buffer to store read data from socket
+ * @to_read: number of bytes to read from socket
+ *
+ * Return: on success return number of bytes read from socket,
+ * otherwise return error number
+ */
+static int ksmbd_tcp_read(struct ksmbd_transport *t,
+ char *buf,
+ unsigned int to_read)
+{
+ struct kvec iov;
+
+ iov.iov_base = buf;
+ iov.iov_len = to_read;
+
+ return ksmbd_tcp_readv(TCP_TRANS(t), &iov, 1, to_read);
+}
+
+static int ksmbd_tcp_writev(struct ksmbd_transport *t,
+ struct kvec *iov, int nvecs, int size,
+ bool need_invalidate, unsigned int remote_key)
+
+{
+ struct msghdr smb_msg = {.msg_flags = MSG_NOSIGNAL};
+
+ return kernel_sendmsg(TCP_TRANS(t)->sock, &smb_msg, iov, nvecs, size);
+}
+
+static void ksmbd_tcp_disconnect(struct ksmbd_transport *t)
+{
+ free_transport(TCP_TRANS(t));
+}
+
+static void tcp_destroy_socket(struct socket *ksmbd_socket)
+{
+ int ret;
+
+ if (!ksmbd_socket)
+ return;
+
+ /* set zero to timeout */
+ ksmbd_tcp_rcv_timeout(ksmbd_socket, 0);
+ ksmbd_tcp_snd_timeout(ksmbd_socket, 0);
+
+ ret = kernel_sock_shutdown(ksmbd_socket, SHUT_RDWR);
+ if (ret)
+ ksmbd_err("Failed to shutdown socket: %d\n", ret);
+ else
+ sock_release(ksmbd_socket);
+}
+
+/**
+ * create_socket - create socket for ksmbd/0
+ *
+ * Return: Returns a task_struct or ERR_PTR
+ */
+static int create_socket(struct interface *iface)
+{
+ int ret;
+ struct sockaddr_in6 sin6;
+ struct sockaddr_in sin;
+ struct socket *ksmbd_socket;
+ bool ipv4 = false;
+
+ ret = sock_create(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &ksmbd_socket);
+ if (ret) {
+ ksmbd_err("Can't create socket for ipv6, try ipv4: %d\n", ret);
+ ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP,
+ &ksmbd_socket);
+ if (ret) {
+ ksmbd_err("Can't create socket for ipv4: %d\n", ret);
+ goto out_error;
+ }
+
+ sin.sin_family = PF_INET;
+ sin.sin_addr.s_addr = htonl(INADDR_ANY);
+ sin.sin_port = htons(server_conf.tcp_port);
+ ipv4 = true;
+ } else {
+ sin6.sin6_family = PF_INET6;
+ sin6.sin6_addr = in6addr_any;
+ sin6.sin6_port = htons(server_conf.tcp_port);
+ }
+
+ ksmbd_tcp_nodelay(ksmbd_socket);
+ ksmbd_tcp_reuseaddr(ksmbd_socket);
+
+ ret = sock_setsockopt(ksmbd_socket,
+ SOL_SOCKET,
+ SO_BINDTODEVICE,
+ KERNEL_SOCKPTR(iface->name),
+ strlen(iface->name));
+ if (ret != -ENODEV && ret < 0) {
+ ksmbd_err("Failed to set SO_BINDTODEVICE: %d\n", ret);
+ goto out_error;
+ }
+
+ if (ipv4)
+ ret = kernel_bind(ksmbd_socket, (struct sockaddr *)&sin,
+ sizeof(sin));
+ else
+ ret = kernel_bind(ksmbd_socket, (struct sockaddr *)&sin6,
+ sizeof(sin6));
+ if (ret) {
+ ksmbd_err("Failed to bind socket: %d\n", ret);
+ goto out_error;
+ }
+
+ ksmbd_socket->sk->sk_rcvtimeo = KSMBD_TCP_RECV_TIMEOUT;
+ ksmbd_socket->sk->sk_sndtimeo = KSMBD_TCP_SEND_TIMEOUT;
+
+ ret = kernel_listen(ksmbd_socket, KSMBD_SOCKET_BACKLOG);
+ if (ret) {
+ ksmbd_err("Port listen() error: %d\n", ret);
+ goto out_error;
+ }
+
+ iface->ksmbd_socket = ksmbd_socket;
+ ret = ksmbd_tcp_run_kthread(iface);
+ if (ret) {
+ ksmbd_err("Can't start ksmbd main kthread: %d\n", ret);
+ goto out_error;
+ }
+ iface->state = IFACE_STATE_CONFIGURED;
+
+ return 0;
+
+out_error:
+ tcp_destroy_socket(ksmbd_socket);
+ iface->ksmbd_socket = NULL;
+ return ret;
+}
+
+static int ksmbd_netdev_event(struct notifier_block *nb, unsigned long event,
+ void *ptr)
+{
+ struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
+ struct interface *iface;
+ int ret, found = 0;
+
+ switch (event) {
+ case NETDEV_UP:
+ if (netdev->priv_flags & IFF_BRIDGE_PORT)
+ return NOTIFY_OK;
+
+ list_for_each_entry(iface, &iface_list, entry) {
+ if (!strcmp(iface->name, netdev->name)) {
+ found = 1;
+ if (iface->state != IFACE_STATE_DOWN)
+ break;
+ ret = create_socket(iface);
+ if (ret)
+ return NOTIFY_OK;
+ break;
+ }
+ }
+ if (!found && bind_additional_ifaces) {
+ iface = alloc_iface(kstrdup(netdev->name, GFP_KERNEL));
+ if (!iface)
+ return NOTIFY_OK;
+ ret = create_socket(iface);
+ if (ret)
+ break;
+ }
+ break;
+ case NETDEV_DOWN:
+ list_for_each_entry(iface, &iface_list, entry) {
+ if (!strcmp(iface->name, netdev->name) &&
+ iface->state == IFACE_STATE_CONFIGURED) {
+ tcp_stop_kthread(iface->ksmbd_kthread);
+ iface->ksmbd_kthread = NULL;
+ mutex_lock(&iface->sock_release_lock);
+ tcp_destroy_socket(iface->ksmbd_socket);
+ iface->ksmbd_socket = NULL;
+ mutex_unlock(&iface->sock_release_lock);
+
+ iface->state = IFACE_STATE_DOWN;
+ break;
+ }
+ }
+ break;
+ }
+
+ return NOTIFY_DONE;
+
+}
+
+static struct notifier_block ksmbd_netdev_notifier = {
+ .notifier_call = ksmbd_netdev_event,
+};
+
+int ksmbd_tcp_init(void)
+{
+ register_netdevice_notifier(&ksmbd_netdev_notifier);
+
+ return 0;
+}
+
+static void tcp_stop_kthread(struct task_struct *kthread)
+{
+ int ret;
+
+ if (!kthread)
+ return;
+
+ ret = kthread_stop(kthread);
+ if (ret)
+ ksmbd_err("failed to stop forker thread\n");
+}
+
+void ksmbd_tcp_destroy(void)
+{
+ struct interface *iface, *tmp;
+
+ unregister_netdevice_notifier(&ksmbd_netdev_notifier);
+
+ list_for_each_entry_safe(iface, tmp, &iface_list, entry) {
+ list_del(&iface->entry);
+ kfree(iface->name);
+ ksmbd_free(iface);
+ }
+}
+
+static struct interface *alloc_iface(char *ifname)
+{
+ struct interface *iface;
+
+ if (!ifname)
+ return NULL;
+
+ iface = ksmbd_alloc(sizeof(struct interface));
+ if (!iface) {
+ kfree(ifname);
+ return NULL;
+ }
+
+ iface->name = ifname;
+ iface->state = IFACE_STATE_DOWN;
+ list_add(&iface->entry, &iface_list);
+ mutex_init(&iface->sock_release_lock);
+ return iface;
+}
+
+int ksmbd_tcp_set_interfaces(char *ifc_list, int ifc_list_sz)
+{
+ int sz = 0;
+
+ if (!ifc_list_sz) {
+ struct net_device *netdev;
+
+ rtnl_lock();
+ for_each_netdev(&init_net, netdev) {
+ if (netdev->priv_flags & IFF_BRIDGE_PORT)
+ continue;
+ if (!alloc_iface(kstrdup(netdev->name, GFP_KERNEL)))
+ return -ENOMEM;
+ }
+ rtnl_unlock();
+ bind_additional_ifaces = 1;
+ return 0;
+ }
+
+ while (ifc_list_sz > 0) {
+ if (!alloc_iface(kstrdup(ifc_list, GFP_KERNEL)))
+ return -ENOMEM;
+
+ sz = strlen(ifc_list);
+ if (!sz)
+ break;
+
+ ifc_list += sz + 1;
+ ifc_list_sz -= (sz + 1);
+ }
+
+ bind_additional_ifaces = 0;
+
+ return 0;
+}
+
+static struct ksmbd_transport_ops ksmbd_tcp_transport_ops = {
+ .read = ksmbd_tcp_read,
+ .writev = ksmbd_tcp_writev,
+ .disconnect = ksmbd_tcp_disconnect,
+};
diff --git a/fs/cifsd/transport_tcp.h b/fs/cifsd/transport_tcp.h
new file mode 100644
index 000000000000..e338bebe322f
--- /dev/null
+++ b/fs/cifsd/transport_tcp.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#ifndef __KSMBD_TRANSPORT_TCP_H__
+#define __KSMBD_TRANSPORT_TCP_H__
+
+int ksmbd_tcp_set_interfaces(char *ifc_list, int ifc_list_sz);
+int ksmbd_tcp_init(void);
+void ksmbd_tcp_destroy(void);
+
+#endif /* __KSMBD_TRANSPORT_TCP_H__ */
--
2.17.1