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 conn->total_credits = 1;
66 init_waitqueue_head(&conn->req_running_q);
67 INIT_LIST_HEAD(&conn->conns_list);
68 INIT_LIST_HEAD(&conn->sessions);
69 INIT_LIST_HEAD(&conn->requests);
70 INIT_LIST_HEAD(&conn->async_requests);
71 spin_lock_init(&conn->request_lock);
72 spin_lock_init(&conn->credits_lock);
73 ida_init(&conn->async_ida);
75 spin_lock_init(&conn->llist_lock);
76 INIT_LIST_HEAD(&conn->lock_list);
78 write_lock(&conn_list_lock);
79 list_add(&conn->conns_list, &conn_list);
80 write_unlock(&conn_list_lock);
84 bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
89 read_lock(&conn_list_lock);
90 list_for_each_entry(t, &conn_list, conns_list) {
91 if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
97 read_unlock(&conn_list_lock);
101 void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
103 struct ksmbd_conn *conn = work->conn;
104 struct list_head *requests_queue = NULL;
106 if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE) {
107 requests_queue = &conn->requests;
108 work->syncronous = true;
111 if (requests_queue) {
112 atomic_inc(&conn->req_running);
113 spin_lock(&conn->request_lock);
114 list_add_tail(&work->request_entry, requests_queue);
115 spin_unlock(&conn->request_lock);
119 int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
121 struct ksmbd_conn *conn = work->conn;
124 if (list_empty(&work->request_entry) &&
125 list_empty(&work->async_request_entry))
129 atomic_dec(&conn->req_running);
130 spin_lock(&conn->request_lock);
131 if (!work->multiRsp) {
132 list_del_init(&work->request_entry);
133 if (work->syncronous == false)
134 list_del_init(&work->async_request_entry);
137 spin_unlock(&conn->request_lock);
139 wake_up_all(&conn->req_running_q);
143 static void ksmbd_conn_lock(struct ksmbd_conn *conn)
145 mutex_lock(&conn->srv_mutex);
148 static void ksmbd_conn_unlock(struct ksmbd_conn *conn)
150 mutex_unlock(&conn->srv_mutex);
153 void ksmbd_conn_wait_idle(struct ksmbd_conn *conn)
155 wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
158 int ksmbd_conn_write(struct ksmbd_work *work)
160 struct ksmbd_conn *conn = work->conn;
161 struct smb_hdr *rsp_hdr = work->response_buf;
167 ksmbd_conn_try_dequeue_request(work);
169 pr_err("NULL response header\n");
174 iov[iov_idx] = (struct kvec) { work->tr_buf,
175 sizeof(struct smb2_transform_hdr) };
176 len += iov[iov_idx++].iov_len;
179 if (work->aux_payload_sz) {
180 iov[iov_idx] = (struct kvec) { rsp_hdr, work->resp_hdr_sz };
181 len += iov[iov_idx++].iov_len;
182 iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
183 len += iov[iov_idx++].iov_len;
186 iov[iov_idx].iov_len = work->resp_hdr_sz;
188 iov[iov_idx].iov_len = get_rfc1002_len(rsp_hdr) + 4;
189 iov[iov_idx].iov_base = rsp_hdr;
190 len += iov[iov_idx++].iov_len;
193 ksmbd_conn_lock(conn);
194 sent = conn->transport->ops->writev(conn->transport, &iov[0],
196 work->need_invalidate_rkey,
198 ksmbd_conn_unlock(conn);
201 pr_err("Failed to send message: %d\n", sent);
208 int ksmbd_conn_rdma_read(struct ksmbd_conn *conn, void *buf,
209 unsigned int buflen, u32 remote_key, u64 remote_offset,
214 if (conn->transport->ops->rdma_read)
215 ret = conn->transport->ops->rdma_read(conn->transport,
217 remote_key, remote_offset,
222 int ksmbd_conn_rdma_write(struct ksmbd_conn *conn, void *buf,
223 unsigned int buflen, u32 remote_key,
224 u64 remote_offset, u32 remote_len)
228 if (conn->transport->ops->rdma_write)
229 ret = conn->transport->ops->rdma_write(conn->transport,
231 remote_key, remote_offset,
236 bool ksmbd_conn_alive(struct ksmbd_conn *conn)
238 if (!ksmbd_server_running())
241 if (conn->status == KSMBD_SESS_EXITING)
244 if (kthread_should_stop())
247 if (atomic_read(&conn->stats.open_files_count) > 0)
251 * Stop current session if the time that get last request from client
252 * is bigger than deadtime user configured and opening file count is
255 if (server_conf.deadtime > 0 &&
256 time_after(jiffies, conn->last_active + server_conf.deadtime)) {
257 ksmbd_debug(CONN, "No response from client in %lu minutes\n",
258 server_conf.deadtime / SMB_ECHO_INTERVAL);
265 * ksmbd_conn_handler_loop() - session thread to listen on new smb requests
266 * @p: connection instance
268 * One thread each per connection
270 * Return: 0 on success
272 int ksmbd_conn_handler_loop(void *p)
274 struct ksmbd_conn *conn = (struct ksmbd_conn *)p;
275 struct ksmbd_transport *t = conn->transport;
276 unsigned int pdu_size;
277 char hdr_buf[4] = {0,};
280 mutex_init(&conn->srv_mutex);
281 __module_get(THIS_MODULE);
283 if (t->ops->prepare && t->ops->prepare(t))
286 conn->last_active = jiffies;
287 while (ksmbd_conn_alive(conn)) {
291 kvfree(conn->request_buf);
292 conn->request_buf = NULL;
294 size = t->ops->read(t, hdr_buf, sizeof(hdr_buf));
295 if (size != sizeof(hdr_buf))
298 pdu_size = get_rfc1002_len(hdr_buf);
299 ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
302 * Check if pdu size is valid (min : smb header size,
305 if (pdu_size < __SMB2_HEADER_STRUCTURE_SIZE ||
306 pdu_size > MAX_STREAM_PROT_LEN) {
310 /* 4 for rfc1002 length field */
312 conn->request_buf = kvmalloc(size, GFP_KERNEL);
313 if (!conn->request_buf)
316 memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
317 if (!ksmbd_smb_request(conn))
321 * We already read 4 bytes to find out PDU size, now
324 size = t->ops->read(t, conn->request_buf + 4, pdu_size);
326 pr_err("sock_read failed: %d\n", size);
330 if (size != pdu_size) {
331 pr_err("PDU error. Read: %d, Expected: %d\n",
336 if (!default_conn_ops.process_fn) {
337 pr_err("No connection request callback\n");
341 if (default_conn_ops.process_fn(conn)) {
342 pr_err("Cannot handle request\n");
348 /* Wait till all reference dropped to the Server object*/
349 while (atomic_read(&conn->r_count) > 0)
350 schedule_timeout(HZ);
352 unload_nls(conn->local_nls);
353 if (default_conn_ops.terminate_fn)
354 default_conn_ops.terminate_fn(conn);
355 t->ops->disconnect(t);
356 module_put(THIS_MODULE);
360 void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
362 default_conn_ops.process_fn = ops->process_fn;
363 default_conn_ops.terminate_fn = ops->terminate_fn;
366 int ksmbd_conn_transport_init(void)
370 mutex_lock(&init_lock);
371 ret = ksmbd_tcp_init();
373 pr_err("Failed to init TCP subsystem: %d\n", ret);
377 ret = ksmbd_rdma_init();
379 pr_err("Failed to init RDMA subsystem: %d\n", ret);
383 mutex_unlock(&init_lock);
387 static void stop_sessions(void)
389 struct ksmbd_conn *conn;
392 read_lock(&conn_list_lock);
393 list_for_each_entry(conn, &conn_list, conns_list) {
394 struct task_struct *task;
396 task = conn->transport->handler;
398 ksmbd_debug(CONN, "Stop session handler %s/%d\n",
399 task->comm, task_pid_nr(task));
400 conn->status = KSMBD_SESS_EXITING;
402 read_unlock(&conn_list_lock);
404 if (!list_empty(&conn_list)) {
405 schedule_timeout_interruptible(HZ / 10); /* 100ms */
410 void ksmbd_conn_transport_destroy(void)
412 mutex_lock(&init_lock);
414 ksmbd_rdma_destroy();
416 mutex_unlock(&init_lock);