1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2016 Namjae Jeon <namjae.jeon@protocolfreedom.org>
4 * Copyright (C) 2018 Samsung Electronics Co., Ltd.
7 #include <linux/mutex.h>
8 #include <linux/freezer.h>
9 #include <linux/module.h>
12 #include "smb_common.h"
13 #include "mgmt/ksmbd_ida.h"
14 #include "connection.h"
15 #include "transport_tcp.h"
16 #include "transport_rdma.h"
18 static DEFINE_MUTEX(init_lock);
20 static struct ksmbd_conn_ops default_conn_ops;
23 DEFINE_RWLOCK(conn_list_lock);
26 * ksmbd_conn_free() - free resources of the connection instance
28 * @conn: connection instance to be cleand up
30 * During the thread termination, the corresponding conn instance
31 * resources(sock/memory) are released and finally the conn object is freed.
33 void ksmbd_conn_free(struct ksmbd_conn *conn)
35 write_lock(&conn_list_lock);
36 list_del(&conn->conns_list);
37 write_unlock(&conn_list_lock);
39 kvfree(conn->request_buf);
40 kfree(conn->preauth_info);
45 * ksmbd_conn_alloc() - initialize a new connection instance
47 * Return: ksmbd_conn struct on success, otherwise NULL
49 struct ksmbd_conn *ksmbd_conn_alloc(void)
51 struct ksmbd_conn *conn;
53 conn = kzalloc(sizeof(struct ksmbd_conn), GFP_KERNEL);
57 conn->need_neg = true;
58 conn->status = KSMBD_SESS_NEW;
59 conn->local_nls = load_nls("utf8");
61 conn->local_nls = load_nls_default();
62 atomic_set(&conn->req_running, 0);
63 atomic_set(&conn->r_count, 0);
64 init_waitqueue_head(&conn->req_running_q);
65 INIT_LIST_HEAD(&conn->conns_list);
66 INIT_LIST_HEAD(&conn->sessions);
67 INIT_LIST_HEAD(&conn->requests);
68 INIT_LIST_HEAD(&conn->async_requests);
69 spin_lock_init(&conn->request_lock);
70 spin_lock_init(&conn->credits_lock);
71 ida_init(&conn->async_ida);
73 spin_lock_init(&conn->llist_lock);
74 INIT_LIST_HEAD(&conn->lock_list);
76 write_lock(&conn_list_lock);
77 list_add(&conn->conns_list, &conn_list);
78 write_unlock(&conn_list_lock);
82 bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
87 read_lock(&conn_list_lock);
88 list_for_each_entry(t, &conn_list, conns_list) {
89 if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
95 read_unlock(&conn_list_lock);
99 void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
101 struct ksmbd_conn *conn = work->conn;
102 struct list_head *requests_queue = NULL;
104 if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE) {
105 requests_queue = &conn->requests;
106 work->syncronous = true;
109 if (requests_queue) {
110 atomic_inc(&conn->req_running);
111 spin_lock(&conn->request_lock);
112 list_add_tail(&work->request_entry, requests_queue);
113 spin_unlock(&conn->request_lock);
117 int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
119 struct ksmbd_conn *conn = work->conn;
122 if (list_empty(&work->request_entry) &&
123 list_empty(&work->async_request_entry))
127 atomic_dec(&conn->req_running);
128 spin_lock(&conn->request_lock);
129 if (!work->multiRsp) {
130 list_del_init(&work->request_entry);
131 if (work->syncronous == false)
132 list_del_init(&work->async_request_entry);
135 spin_unlock(&conn->request_lock);
137 wake_up_all(&conn->req_running_q);
141 static void ksmbd_conn_lock(struct ksmbd_conn *conn)
143 mutex_lock(&conn->srv_mutex);
146 static void ksmbd_conn_unlock(struct ksmbd_conn *conn)
148 mutex_unlock(&conn->srv_mutex);
151 void ksmbd_conn_wait_idle(struct ksmbd_conn *conn)
153 wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
156 int ksmbd_conn_write(struct ksmbd_work *work)
158 struct ksmbd_conn *conn = work->conn;
159 struct smb_hdr *rsp_hdr = work->response_buf;
165 ksmbd_conn_try_dequeue_request(work);
167 pr_err("NULL response header\n");
172 iov[iov_idx] = (struct kvec) { work->tr_buf,
173 sizeof(struct smb2_transform_hdr) };
174 len += iov[iov_idx++].iov_len;
177 if (work->aux_payload_sz) {
178 iov[iov_idx] = (struct kvec) { rsp_hdr, work->resp_hdr_sz };
179 len += iov[iov_idx++].iov_len;
180 iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
181 len += iov[iov_idx++].iov_len;
184 iov[iov_idx].iov_len = work->resp_hdr_sz;
186 iov[iov_idx].iov_len = get_rfc1002_len(rsp_hdr) + 4;
187 iov[iov_idx].iov_base = rsp_hdr;
188 len += iov[iov_idx++].iov_len;
191 ksmbd_conn_lock(conn);
192 sent = conn->transport->ops->writev(conn->transport, &iov[0],
194 work->need_invalidate_rkey,
196 ksmbd_conn_unlock(conn);
199 pr_err("Failed to send message: %d\n", sent);
206 int ksmbd_conn_rdma_read(struct ksmbd_conn *conn, void *buf,
207 unsigned int buflen, u32 remote_key, u64 remote_offset,
212 if (conn->transport->ops->rdma_read)
213 ret = conn->transport->ops->rdma_read(conn->transport,
215 remote_key, remote_offset,
220 int ksmbd_conn_rdma_write(struct ksmbd_conn *conn, void *buf,
221 unsigned int buflen, u32 remote_key,
222 u64 remote_offset, u32 remote_len)
226 if (conn->transport->ops->rdma_write)
227 ret = conn->transport->ops->rdma_write(conn->transport,
229 remote_key, remote_offset,
234 bool ksmbd_conn_alive(struct ksmbd_conn *conn)
236 if (!ksmbd_server_running())
239 if (conn->status == KSMBD_SESS_EXITING)
242 if (kthread_should_stop())
245 if (atomic_read(&conn->stats.open_files_count) > 0)
249 * Stop current session if the time that get last request from client
250 * is bigger than deadtime user configured and opening file count is
253 if (server_conf.deadtime > 0 &&
254 time_after(jiffies, conn->last_active + server_conf.deadtime)) {
255 ksmbd_debug(CONN, "No response from client in %lu minutes\n",
256 server_conf.deadtime / SMB_ECHO_INTERVAL);
263 * ksmbd_conn_handler_loop() - session thread to listen on new smb requests
264 * @p: connection instance
266 * One thread each per connection
268 * Return: 0 on success
270 int ksmbd_conn_handler_loop(void *p)
272 struct ksmbd_conn *conn = (struct ksmbd_conn *)p;
273 struct ksmbd_transport *t = conn->transport;
274 unsigned int pdu_size;
275 char hdr_buf[4] = {0,};
278 mutex_init(&conn->srv_mutex);
279 __module_get(THIS_MODULE);
281 if (t->ops->prepare && t->ops->prepare(t))
284 conn->last_active = jiffies;
285 while (ksmbd_conn_alive(conn)) {
289 kvfree(conn->request_buf);
290 conn->request_buf = NULL;
292 size = t->ops->read(t, hdr_buf, sizeof(hdr_buf));
293 if (size != sizeof(hdr_buf))
296 pdu_size = get_rfc1002_len(hdr_buf);
297 ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
299 /* make sure we have enough to get to SMB header end */
300 if (!ksmbd_pdu_size_has_room(pdu_size)) {
301 ksmbd_debug(CONN, "SMB request too short (%u bytes)\n",
306 /* 4 for rfc1002 length field */
308 conn->request_buf = kvmalloc(size, GFP_KERNEL);
309 if (!conn->request_buf)
312 memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
313 if (!ksmbd_smb_request(conn))
317 * We already read 4 bytes to find out PDU size, now
320 size = t->ops->read(t, conn->request_buf + 4, pdu_size);
322 pr_err("sock_read failed: %d\n", size);
326 if (size != pdu_size) {
327 pr_err("PDU error. Read: %d, Expected: %d\n",
332 if (!default_conn_ops.process_fn) {
333 pr_err("No connection request callback\n");
337 if (default_conn_ops.process_fn(conn)) {
338 pr_err("Cannot handle request\n");
344 /* Wait till all reference dropped to the Server object*/
345 while (atomic_read(&conn->r_count) > 0)
346 schedule_timeout(HZ);
348 unload_nls(conn->local_nls);
349 if (default_conn_ops.terminate_fn)
350 default_conn_ops.terminate_fn(conn);
351 t->ops->disconnect(t);
352 module_put(THIS_MODULE);
356 void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
358 default_conn_ops.process_fn = ops->process_fn;
359 default_conn_ops.terminate_fn = ops->terminate_fn;
362 int ksmbd_conn_transport_init(void)
366 mutex_lock(&init_lock);
367 ret = ksmbd_tcp_init();
369 pr_err("Failed to init TCP subsystem: %d\n", ret);
373 ret = ksmbd_rdma_init();
375 pr_err("Failed to init RDMA subsystem: %d\n", ret);
379 mutex_unlock(&init_lock);
383 static void stop_sessions(void)
385 struct ksmbd_conn *conn;
388 read_lock(&conn_list_lock);
389 list_for_each_entry(conn, &conn_list, conns_list) {
390 struct task_struct *task;
392 task = conn->transport->handler;
394 ksmbd_debug(CONN, "Stop session handler %s/%d\n",
395 task->comm, task_pid_nr(task));
396 conn->status = KSMBD_SESS_EXITING;
398 read_unlock(&conn_list_lock);
400 if (!list_empty(&conn_list)) {
401 schedule_timeout_interruptible(HZ / 10); /* 100ms */
406 void ksmbd_conn_transport_destroy(void)
408 mutex_lock(&init_lock);
410 ksmbd_rdma_destroy();
412 mutex_unlock(&init_lock);