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;
65 conn->outstanding_credits = 0;
67 init_waitqueue_head(&conn->req_running_q);
68 INIT_LIST_HEAD(&conn->conns_list);
69 INIT_LIST_HEAD(&conn->sessions);
70 INIT_LIST_HEAD(&conn->requests);
71 INIT_LIST_HEAD(&conn->async_requests);
72 spin_lock_init(&conn->request_lock);
73 spin_lock_init(&conn->credits_lock);
74 ida_init(&conn->async_ida);
76 spin_lock_init(&conn->llist_lock);
77 INIT_LIST_HEAD(&conn->lock_list);
79 write_lock(&conn_list_lock);
80 list_add(&conn->conns_list, &conn_list);
81 write_unlock(&conn_list_lock);
85 bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
90 read_lock(&conn_list_lock);
91 list_for_each_entry(t, &conn_list, conns_list) {
92 if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
98 read_unlock(&conn_list_lock);
102 void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
104 struct ksmbd_conn *conn = work->conn;
105 struct list_head *requests_queue = NULL;
107 if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE) {
108 requests_queue = &conn->requests;
109 work->syncronous = true;
112 if (requests_queue) {
113 atomic_inc(&conn->req_running);
114 spin_lock(&conn->request_lock);
115 list_add_tail(&work->request_entry, requests_queue);
116 spin_unlock(&conn->request_lock);
120 int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
122 struct ksmbd_conn *conn = work->conn;
125 if (list_empty(&work->request_entry) &&
126 list_empty(&work->async_request_entry))
130 atomic_dec(&conn->req_running);
131 spin_lock(&conn->request_lock);
132 if (!work->multiRsp) {
133 list_del_init(&work->request_entry);
134 if (work->syncronous == false)
135 list_del_init(&work->async_request_entry);
138 spin_unlock(&conn->request_lock);
140 wake_up_all(&conn->req_running_q);
144 static void ksmbd_conn_lock(struct ksmbd_conn *conn)
146 mutex_lock(&conn->srv_mutex);
149 static void ksmbd_conn_unlock(struct ksmbd_conn *conn)
151 mutex_unlock(&conn->srv_mutex);
154 void ksmbd_conn_wait_idle(struct ksmbd_conn *conn)
156 wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
159 int ksmbd_conn_write(struct ksmbd_work *work)
161 struct ksmbd_conn *conn = work->conn;
162 struct smb_hdr *rsp_hdr = work->response_buf;
168 ksmbd_conn_try_dequeue_request(work);
170 pr_err("NULL response header\n");
175 iov[iov_idx] = (struct kvec) { work->tr_buf,
176 sizeof(struct smb2_transform_hdr) };
177 len += iov[iov_idx++].iov_len;
180 if (work->aux_payload_sz) {
181 iov[iov_idx] = (struct kvec) { rsp_hdr, work->resp_hdr_sz };
182 len += iov[iov_idx++].iov_len;
183 iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
184 len += iov[iov_idx++].iov_len;
187 iov[iov_idx].iov_len = work->resp_hdr_sz;
189 iov[iov_idx].iov_len = get_rfc1002_len(rsp_hdr) + 4;
190 iov[iov_idx].iov_base = rsp_hdr;
191 len += iov[iov_idx++].iov_len;
194 ksmbd_conn_lock(conn);
195 sent = conn->transport->ops->writev(conn->transport, &iov[0],
197 work->need_invalidate_rkey,
199 ksmbd_conn_unlock(conn);
202 pr_err("Failed to send message: %d\n", sent);
209 int ksmbd_conn_rdma_read(struct ksmbd_conn *conn, void *buf,
210 unsigned int buflen, u32 remote_key, u64 remote_offset,
215 if (conn->transport->ops->rdma_read)
216 ret = conn->transport->ops->rdma_read(conn->transport,
218 remote_key, remote_offset,
223 int ksmbd_conn_rdma_write(struct ksmbd_conn *conn, void *buf,
224 unsigned int buflen, u32 remote_key,
225 u64 remote_offset, u32 remote_len)
229 if (conn->transport->ops->rdma_write)
230 ret = conn->transport->ops->rdma_write(conn->transport,
232 remote_key, remote_offset,
237 bool ksmbd_conn_alive(struct ksmbd_conn *conn)
239 if (!ksmbd_server_running())
242 if (conn->status == KSMBD_SESS_EXITING)
245 if (kthread_should_stop())
248 if (atomic_read(&conn->stats.open_files_count) > 0)
252 * Stop current session if the time that get last request from client
253 * is bigger than deadtime user configured and opening file count is
256 if (server_conf.deadtime > 0 &&
257 time_after(jiffies, conn->last_active + server_conf.deadtime)) {
258 ksmbd_debug(CONN, "No response from client in %lu minutes\n",
259 server_conf.deadtime / SMB_ECHO_INTERVAL);
266 * ksmbd_conn_handler_loop() - session thread to listen on new smb requests
267 * @p: connection instance
269 * One thread each per connection
271 * Return: 0 on success
273 int ksmbd_conn_handler_loop(void *p)
275 struct ksmbd_conn *conn = (struct ksmbd_conn *)p;
276 struct ksmbd_transport *t = conn->transport;
277 unsigned int pdu_size;
278 char hdr_buf[4] = {0,};
281 mutex_init(&conn->srv_mutex);
282 __module_get(THIS_MODULE);
284 if (t->ops->prepare && t->ops->prepare(t))
287 conn->last_active = jiffies;
288 while (ksmbd_conn_alive(conn)) {
292 kvfree(conn->request_buf);
293 conn->request_buf = NULL;
295 size = t->ops->read(t, hdr_buf, sizeof(hdr_buf));
296 if (size != sizeof(hdr_buf))
299 pdu_size = get_rfc1002_len(hdr_buf);
300 ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
303 * Check if pdu size is valid (min : smb header size,
306 if (pdu_size < __SMB2_HEADER_STRUCTURE_SIZE ||
307 pdu_size > MAX_STREAM_PROT_LEN) {
311 /* 4 for rfc1002 length field */
313 conn->request_buf = kvmalloc(size, GFP_KERNEL);
314 if (!conn->request_buf)
317 memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
318 if (!ksmbd_smb_request(conn))
322 * We already read 4 bytes to find out PDU size, now
325 size = t->ops->read(t, conn->request_buf + 4, pdu_size);
327 pr_err("sock_read failed: %d\n", size);
331 if (size != pdu_size) {
332 pr_err("PDU error. Read: %d, Expected: %d\n",
337 if (!default_conn_ops.process_fn) {
338 pr_err("No connection request callback\n");
342 if (default_conn_ops.process_fn(conn)) {
343 pr_err("Cannot handle request\n");
349 /* Wait till all reference dropped to the Server object*/
350 while (atomic_read(&conn->r_count) > 0)
351 schedule_timeout(HZ);
353 unload_nls(conn->local_nls);
354 if (default_conn_ops.terminate_fn)
355 default_conn_ops.terminate_fn(conn);
356 t->ops->disconnect(t);
357 module_put(THIS_MODULE);
361 void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
363 default_conn_ops.process_fn = ops->process_fn;
364 default_conn_ops.terminate_fn = ops->terminate_fn;
367 int ksmbd_conn_transport_init(void)
371 mutex_lock(&init_lock);
372 ret = ksmbd_tcp_init();
374 pr_err("Failed to init TCP subsystem: %d\n", ret);
378 ret = ksmbd_rdma_init();
380 pr_err("Failed to init RDMA subsystem: %d\n", ret);
384 mutex_unlock(&init_lock);
388 static void stop_sessions(void)
390 struct ksmbd_conn *conn;
393 read_lock(&conn_list_lock);
394 list_for_each_entry(conn, &conn_list, conns_list) {
395 struct task_struct *task;
397 task = conn->transport->handler;
399 ksmbd_debug(CONN, "Stop session handler %s/%d\n",
400 task->comm, task_pid_nr(task));
401 conn->status = KSMBD_SESS_EXITING;
403 read_unlock(&conn_list_lock);
405 if (!list_empty(&conn_list)) {
406 schedule_timeout_interruptible(HZ / 10); /* 100ms */
411 void ksmbd_conn_transport_destroy(void)
413 mutex_lock(&init_lock);
415 ksmbd_rdma_destroy();
417 mutex_unlock(&init_lock);