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 xa_destroy(&conn->sessions);
40 kvfree(conn->request_buf);
41 kfree(conn->preauth_info);
46 * ksmbd_conn_alloc() - initialize a new connection instance
48 * Return: ksmbd_conn struct on success, otherwise NULL
50 struct ksmbd_conn *ksmbd_conn_alloc(void)
52 struct ksmbd_conn *conn;
54 conn = kzalloc(sizeof(struct ksmbd_conn), GFP_KERNEL);
58 conn->need_neg = true;
59 conn->status = KSMBD_SESS_NEW;
60 conn->local_nls = load_nls("utf8");
62 conn->local_nls = load_nls_default();
63 if (IS_ENABLED(CONFIG_UNICODE))
64 conn->um = utf8_load(UNICODE_AGE(12, 1, 0));
66 conn->um = ERR_PTR(-EOPNOTSUPP);
69 atomic_set(&conn->req_running, 0);
70 atomic_set(&conn->r_count, 0);
71 conn->total_credits = 1;
72 conn->outstanding_credits = 0;
74 init_waitqueue_head(&conn->req_running_q);
75 init_waitqueue_head(&conn->r_count_q);
76 INIT_LIST_HEAD(&conn->conns_list);
77 INIT_LIST_HEAD(&conn->requests);
78 INIT_LIST_HEAD(&conn->async_requests);
79 spin_lock_init(&conn->request_lock);
80 spin_lock_init(&conn->credits_lock);
81 ida_init(&conn->async_ida);
82 xa_init(&conn->sessions);
84 spin_lock_init(&conn->llist_lock);
85 INIT_LIST_HEAD(&conn->lock_list);
87 write_lock(&conn_list_lock);
88 list_add(&conn->conns_list, &conn_list);
89 write_unlock(&conn_list_lock);
93 bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
98 read_lock(&conn_list_lock);
99 list_for_each_entry(t, &conn_list, conns_list) {
100 if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
106 read_unlock(&conn_list_lock);
110 void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
112 struct ksmbd_conn *conn = work->conn;
113 struct list_head *requests_queue = NULL;
115 if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE)
116 requests_queue = &conn->requests;
118 if (requests_queue) {
119 atomic_inc(&conn->req_running);
120 spin_lock(&conn->request_lock);
121 list_add_tail(&work->request_entry, requests_queue);
122 spin_unlock(&conn->request_lock);
126 int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
128 struct ksmbd_conn *conn = work->conn;
131 if (list_empty(&work->request_entry) &&
132 list_empty(&work->async_request_entry))
136 atomic_dec(&conn->req_running);
137 if (!work->multiRsp) {
138 spin_lock(&conn->request_lock);
139 list_del_init(&work->request_entry);
140 spin_unlock(&conn->request_lock);
141 if (work->asynchronous)
142 release_async_work(work);
146 wake_up_all(&conn->req_running_q);
150 static void ksmbd_conn_lock(struct ksmbd_conn *conn)
152 mutex_lock(&conn->srv_mutex);
155 static void ksmbd_conn_unlock(struct ksmbd_conn *conn)
157 mutex_unlock(&conn->srv_mutex);
160 void ksmbd_conn_wait_idle(struct ksmbd_conn *conn)
162 wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
165 int ksmbd_conn_write(struct ksmbd_work *work)
167 struct ksmbd_conn *conn = work->conn;
173 if (!work->response_buf) {
174 pr_err("NULL response header\n");
179 iov[iov_idx] = (struct kvec) { work->tr_buf,
180 sizeof(struct smb2_transform_hdr) + 4 };
181 len += iov[iov_idx++].iov_len;
184 if (work->aux_payload_sz) {
185 iov[iov_idx] = (struct kvec) { work->response_buf, work->resp_hdr_sz };
186 len += iov[iov_idx++].iov_len;
187 iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
188 len += iov[iov_idx++].iov_len;
191 iov[iov_idx].iov_len = work->resp_hdr_sz;
193 iov[iov_idx].iov_len = get_rfc1002_len(work->response_buf) + 4;
194 iov[iov_idx].iov_base = work->response_buf;
195 len += iov[iov_idx++].iov_len;
198 ksmbd_conn_lock(conn);
199 sent = conn->transport->ops->writev(conn->transport, &iov[0],
201 work->need_invalidate_rkey,
203 ksmbd_conn_unlock(conn);
206 pr_err("Failed to send message: %d\n", sent);
213 int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
214 void *buf, unsigned int buflen,
215 struct smb2_buffer_desc_v1 *desc,
216 unsigned int desc_len)
220 if (conn->transport->ops->rdma_read)
221 ret = conn->transport->ops->rdma_read(conn->transport,
227 int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
228 void *buf, unsigned int buflen,
229 struct smb2_buffer_desc_v1 *desc,
230 unsigned int desc_len)
234 if (conn->transport->ops->rdma_write)
235 ret = conn->transport->ops->rdma_write(conn->transport,
241 bool ksmbd_conn_alive(struct ksmbd_conn *conn)
243 if (!ksmbd_server_running())
246 if (conn->status == KSMBD_SESS_EXITING)
249 if (kthread_should_stop())
252 if (atomic_read(&conn->stats.open_files_count) > 0)
256 * Stop current session if the time that get last request from client
257 * is bigger than deadtime user configured and opening file count is
260 if (server_conf.deadtime > 0 &&
261 time_after(jiffies, conn->last_active + server_conf.deadtime)) {
262 ksmbd_debug(CONN, "No response from client in %lu minutes\n",
263 server_conf.deadtime / SMB_ECHO_INTERVAL);
270 * ksmbd_conn_handler_loop() - session thread to listen on new smb requests
271 * @p: connection instance
273 * One thread each per connection
275 * Return: 0 on success
277 int ksmbd_conn_handler_loop(void *p)
279 struct ksmbd_conn *conn = (struct ksmbd_conn *)p;
280 struct ksmbd_transport *t = conn->transport;
281 unsigned int pdu_size, max_allowed_pdu_size;
282 char hdr_buf[4] = {0,};
285 mutex_init(&conn->srv_mutex);
286 __module_get(THIS_MODULE);
288 if (t->ops->prepare && t->ops->prepare(t))
291 conn->last_active = jiffies;
292 while (ksmbd_conn_alive(conn)) {
296 kvfree(conn->request_buf);
297 conn->request_buf = NULL;
299 size = t->ops->read(t, hdr_buf, sizeof(hdr_buf), -1);
300 if (size != sizeof(hdr_buf))
303 pdu_size = get_rfc1002_len(hdr_buf);
304 ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
306 if (conn->status == KSMBD_SESS_GOOD)
307 max_allowed_pdu_size =
308 SMB3_MAX_MSGSIZE + conn->vals->max_write_size;
310 max_allowed_pdu_size = SMB3_MAX_MSGSIZE;
312 if (pdu_size > max_allowed_pdu_size) {
313 pr_err_ratelimited("PDU length(%u) exceeded maximum allowed pdu size(%u) on connection(%d)\n",
314 pdu_size, max_allowed_pdu_size,
320 * Check maximum pdu size(0x00FFFFFF).
322 if (pdu_size > MAX_STREAM_PROT_LEN)
325 /* 4 for rfc1002 length field */
327 conn->request_buf = kvmalloc(size, GFP_KERNEL);
328 if (!conn->request_buf)
331 memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
332 if (!ksmbd_smb_request(conn))
336 * We already read 4 bytes to find out PDU size, now
339 size = t->ops->read(t, conn->request_buf + 4, pdu_size, 2);
341 pr_err("sock_read failed: %d\n", size);
345 if (size != pdu_size) {
346 pr_err("PDU error. Read: %d, Expected: %d\n",
351 if (!default_conn_ops.process_fn) {
352 pr_err("No connection request callback\n");
356 if (default_conn_ops.process_fn(conn)) {
357 pr_err("Cannot handle request\n");
363 /* Wait till all reference dropped to the Server object*/
364 wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);
367 if (IS_ENABLED(CONFIG_UNICODE))
368 utf8_unload(conn->um);
369 unload_nls(conn->local_nls);
370 if (default_conn_ops.terminate_fn)
371 default_conn_ops.terminate_fn(conn);
372 t->ops->disconnect(t);
373 module_put(THIS_MODULE);
377 void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
379 default_conn_ops.process_fn = ops->process_fn;
380 default_conn_ops.terminate_fn = ops->terminate_fn;
383 int ksmbd_conn_transport_init(void)
387 mutex_lock(&init_lock);
388 ret = ksmbd_tcp_init();
390 pr_err("Failed to init TCP subsystem: %d\n", ret);
394 ret = ksmbd_rdma_init();
396 pr_err("Failed to init RDMA subsystem: %d\n", ret);
400 mutex_unlock(&init_lock);
404 static void stop_sessions(void)
406 struct ksmbd_conn *conn;
407 struct ksmbd_transport *t;
410 read_lock(&conn_list_lock);
411 list_for_each_entry(conn, &conn_list, conns_list) {
412 struct task_struct *task;
417 ksmbd_debug(CONN, "Stop session handler %s/%d\n",
418 task->comm, task_pid_nr(task));
419 conn->status = KSMBD_SESS_EXITING;
420 if (t->ops->shutdown) {
421 read_unlock(&conn_list_lock);
423 read_lock(&conn_list_lock);
426 read_unlock(&conn_list_lock);
428 if (!list_empty(&conn_list)) {
429 schedule_timeout_interruptible(HZ / 10); /* 100ms */
434 void ksmbd_conn_transport_destroy(void)
436 mutex_lock(&init_lock);
438 ksmbd_rdma_destroy();
440 mutex_unlock(&init_lock);