blob: 215849ce453dfbd70bccceacc4d42b1a2a6d37d8 [file] [log] [blame]
Ying Xuec5fa7b32013-06-17 10:54:39 -04001/*
2 * net/tipc/server.c: TIPC server infrastructure
3 *
4 * Copyright (c) 2012-2013, Wind River Systems
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the names of the copyright holders nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * Alternatively, this software may be distributed under the terms of the
20 * GNU General Public License ("GPL") version 2 as published by the Free
21 * Software Foundation.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 */
35
36#include "server.h"
37#include "core.h"
Ying Xue859fc7c2015-01-09 15:27:01 +080038#include "socket.h"
Ying Xuec5fa7b32013-06-17 10:54:39 -040039#include <net/sock.h>
Ying Xue76100a82015-03-18 09:32:57 +080040#include <linux/module.h>
Ying Xuec5fa7b32013-06-17 10:54:39 -040041
42/* Number of messages to send before rescheduling */
43#define MAX_SEND_MSG_COUNT 25
44#define MAX_RECV_MSG_COUNT 25
45#define CF_CONNECTED 1
Ying Xue76100a82015-03-18 09:32:57 +080046#define CF_SERVER 2
Ying Xuec5fa7b32013-06-17 10:54:39 -040047
48#define sock2con(x) ((struct tipc_conn *)(x)->sk_user_data)
49
50/**
51 * struct tipc_conn - TIPC connection structure
52 * @kref: reference counter to connection object
53 * @conid: connection identifier
54 * @sock: socket handler associated with connection
55 * @flags: indicates connection state
56 * @server: pointer to connected server
57 * @rwork: receive work item
58 * @usr_data: user-specified field
59 * @rx_action: what to do when connection socket is active
60 * @outqueue: pointer to first outbound message in queue
stephen hemminger963a18552014-01-12 12:48:00 -080061 * @outqueue_lock: control access to the outqueue
Ying Xuec5fa7b32013-06-17 10:54:39 -040062 * @outqueue: list of connection objects for its server
63 * @swork: send work item
64 */
65struct tipc_conn {
66 struct kref kref;
67 int conid;
68 struct socket *sock;
69 unsigned long flags;
70 struct tipc_server *server;
71 struct work_struct rwork;
72 int (*rx_action) (struct tipc_conn *con);
73 void *usr_data;
74 struct list_head outqueue;
75 spinlock_t outqueue_lock;
76 struct work_struct swork;
77};
78
79/* An entry waiting to be sent */
80struct outqueue_entry {
81 struct list_head list;
82 struct kvec iov;
83 struct sockaddr_tipc dest;
84};
85
86static void tipc_recv_work(struct work_struct *work);
87static void tipc_send_work(struct work_struct *work);
88static void tipc_clean_outqueues(struct tipc_conn *con);
Parthasarathy Bhuvaragan333f7962016-04-12 13:05:21 +020089static void tipc_sock_release(struct tipc_conn *con);
Ying Xuec5fa7b32013-06-17 10:54:39 -040090
91static void tipc_conn_kref_release(struct kref *kref)
92{
93 struct tipc_conn *con = container_of(kref, struct tipc_conn, kref);
Ying Xue2b9bb7f2015-03-18 09:32:59 +080094 struct sockaddr_tipc *saddr = con->server->saddr;
Ying Xue76100a82015-03-18 09:32:57 +080095 struct socket *sock = con->sock;
96 struct sock *sk;
Ying Xuec5fa7b32013-06-17 10:54:39 -040097
Ying Xue76100a82015-03-18 09:32:57 +080098 if (sock) {
99 sk = sock->sk;
100 if (test_bit(CF_SERVER, &con->flags)) {
101 __module_get(sock->ops->owner);
102 __module_get(sk->sk_prot_creator->owner);
103 }
Ying Xue2b9bb7f2015-03-18 09:32:59 +0800104 saddr->scope = -TIPC_NODE_SCOPE;
105 kernel_bind(sock, (struct sockaddr *)saddr, sizeof(*saddr));
Parthasarathy Bhuvaragan333f7962016-04-12 13:05:21 +0200106 tipc_sock_release(con);
Ying Xuedef81f62015-04-23 09:37:38 -0400107 sock_release(sock);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400108 con->sock = NULL;
109 }
110
111 tipc_clean_outqueues(con);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400112 kfree(con);
113}
114
115static void conn_put(struct tipc_conn *con)
116{
117 kref_put(&con->kref, tipc_conn_kref_release);
118}
119
120static void conn_get(struct tipc_conn *con)
121{
122 kref_get(&con->kref);
123}
124
125static struct tipc_conn *tipc_conn_lookup(struct tipc_server *s, int conid)
126{
127 struct tipc_conn *con;
128
129 spin_lock_bh(&s->idr_lock);
130 con = idr_find(&s->conn_idr, conid);
131 if (con)
132 conn_get(con);
133 spin_unlock_bh(&s->idr_lock);
134 return con;
135}
136
David S. Miller676d2362014-04-11 16:15:36 -0400137static void sock_data_ready(struct sock *sk)
Ying Xuec5fa7b32013-06-17 10:54:39 -0400138{
139 struct tipc_conn *con;
140
Eric Dumazetb91083a2016-05-17 17:44:09 -0700141 read_lock_bh(&sk->sk_callback_lock);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400142 con = sock2con(sk);
143 if (con && test_bit(CF_CONNECTED, &con->flags)) {
144 conn_get(con);
145 if (!queue_work(con->server->rcv_wq, &con->rwork))
146 conn_put(con);
147 }
Eric Dumazetb91083a2016-05-17 17:44:09 -0700148 read_unlock_bh(&sk->sk_callback_lock);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400149}
150
151static void sock_write_space(struct sock *sk)
152{
153 struct tipc_conn *con;
154
Eric Dumazetb91083a2016-05-17 17:44:09 -0700155 read_lock_bh(&sk->sk_callback_lock);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400156 con = sock2con(sk);
157 if (con && test_bit(CF_CONNECTED, &con->flags)) {
158 conn_get(con);
159 if (!queue_work(con->server->send_wq, &con->swork))
160 conn_put(con);
161 }
Eric Dumazetb91083a2016-05-17 17:44:09 -0700162 read_unlock_bh(&sk->sk_callback_lock);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400163}
164
165static void tipc_register_callbacks(struct socket *sock, struct tipc_conn *con)
166{
167 struct sock *sk = sock->sk;
168
169 write_lock_bh(&sk->sk_callback_lock);
170
171 sk->sk_data_ready = sock_data_ready;
172 sk->sk_write_space = sock_write_space;
173 sk->sk_user_data = con;
174
175 con->sock = sock;
176
177 write_unlock_bh(&sk->sk_callback_lock);
178}
179
180static void tipc_unregister_callbacks(struct tipc_conn *con)
181{
182 struct sock *sk = con->sock->sk;
183
184 write_lock_bh(&sk->sk_callback_lock);
185 sk->sk_user_data = NULL;
186 write_unlock_bh(&sk->sk_callback_lock);
187}
188
Parthasarathy Bhuvaragan333f7962016-04-12 13:05:21 +0200189static void tipc_sock_release(struct tipc_conn *con)
190{
191 struct tipc_server *s = con->server;
192
193 if (con->conid)
194 s->tipc_conn_release(con->conid, con->usr_data);
195
196 tipc_unregister_callbacks(con);
197}
198
Ying Xuec5fa7b32013-06-17 10:54:39 -0400199static void tipc_close_conn(struct tipc_conn *con)
200{
201 struct tipc_server *s = con->server;
202
203 if (test_and_clear_bit(CF_CONNECTED, &con->flags)) {
Ying Xue6d4ebeb2014-03-06 14:40:16 +0100204
Ying Xuec5fa7b32013-06-17 10:54:39 -0400205 spin_lock_bh(&s->idr_lock);
206 idr_remove(&s->conn_idr, con->conid);
207 s->idr_in_use--;
208 spin_unlock_bh(&s->idr_lock);
209
Ying Xuec5fa7b32013-06-17 10:54:39 -0400210 /* We shouldn't flush pending works as we may be in the
211 * thread. In fact the races with pending rx/tx work structs
212 * are harmless for us here as we have already deleted this
Parthasarathy Bhuvaragan333f7962016-04-12 13:05:21 +0200213 * connection from server connection list.
Ying Xuec5fa7b32013-06-17 10:54:39 -0400214 */
215 kernel_sock_shutdown(con->sock, SHUT_RDWR);
216
217 conn_put(con);
218 }
219}
220
221static struct tipc_conn *tipc_alloc_conn(struct tipc_server *s)
222{
223 struct tipc_conn *con;
224 int ret;
225
226 con = kzalloc(sizeof(struct tipc_conn), GFP_ATOMIC);
227 if (!con)
228 return ERR_PTR(-ENOMEM);
229
230 kref_init(&con->kref);
231 INIT_LIST_HEAD(&con->outqueue);
232 spin_lock_init(&con->outqueue_lock);
233 INIT_WORK(&con->swork, tipc_send_work);
234 INIT_WORK(&con->rwork, tipc_recv_work);
235
236 spin_lock_bh(&s->idr_lock);
237 ret = idr_alloc(&s->conn_idr, con, 0, 0, GFP_ATOMIC);
238 if (ret < 0) {
239 kfree(con);
240 spin_unlock_bh(&s->idr_lock);
241 return ERR_PTR(-ENOMEM);
242 }
243 con->conid = ret;
244 s->idr_in_use++;
245 spin_unlock_bh(&s->idr_lock);
246
247 set_bit(CF_CONNECTED, &con->flags);
248 con->server = s;
249
250 return con;
251}
252
253static int tipc_receive_from_sock(struct tipc_conn *con)
254{
255 struct msghdr msg = {};
256 struct tipc_server *s = con->server;
257 struct sockaddr_tipc addr;
258 struct kvec iov;
259 void *buf;
260 int ret;
261
262 buf = kmem_cache_alloc(s->rcvbuf_cache, GFP_ATOMIC);
263 if (!buf) {
264 ret = -ENOMEM;
265 goto out_close;
266 }
267
268 iov.iov_base = buf;
269 iov.iov_len = s->max_rcvbuf_size;
270 msg.msg_name = &addr;
271 ret = kernel_recvmsg(con->sock, &msg, &iov, 1, iov.iov_len,
272 MSG_DONTWAIT);
273 if (ret <= 0) {
274 kmem_cache_free(s->rcvbuf_cache, buf);
275 goto out_close;
276 }
277
Ying Xue4ac1c8d2015-01-09 15:27:09 +0800278 s->tipc_conn_recvmsg(sock_net(con->sock->sk), con->conid, &addr,
279 con->usr_data, buf, ret);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400280
281 kmem_cache_free(s->rcvbuf_cache, buf);
282
283 return 0;
284
285out_close:
286 if (ret != -EWOULDBLOCK)
287 tipc_close_conn(con);
288 else if (ret == 0)
289 /* Don't return success if we really got EOF */
290 ret = -EAGAIN;
291
292 return ret;
293}
294
295static int tipc_accept_from_sock(struct tipc_conn *con)
296{
297 struct tipc_server *s = con->server;
298 struct socket *sock = con->sock;
299 struct socket *newsock;
300 struct tipc_conn *newcon;
301 int ret;
302
Ying Xue76100a82015-03-18 09:32:57 +0800303 ret = kernel_accept(sock, &newsock, O_NONBLOCK);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400304 if (ret < 0)
305 return ret;
306
307 newcon = tipc_alloc_conn(con->server);
308 if (IS_ERR(newcon)) {
309 ret = PTR_ERR(newcon);
310 sock_release(newsock);
311 return ret;
312 }
313
314 newcon->rx_action = tipc_receive_from_sock;
315 tipc_register_callbacks(newsock, newcon);
316
317 /* Notify that new connection is incoming */
318 newcon->usr_data = s->tipc_conn_new(newcon->conid);
Ying Xue90bdfcb2015-05-04 10:36:48 +0800319 if (!newcon->usr_data) {
320 sock_release(newsock);
321 return -ENOMEM;
322 }
Ying Xuec5fa7b32013-06-17 10:54:39 -0400323
324 /* Wake up receive process in case of 'SYN+' message */
David S. Miller676d2362014-04-11 16:15:36 -0400325 newsock->sk->sk_data_ready(newsock->sk);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400326 return ret;
327}
328
329static struct socket *tipc_create_listen_sock(struct tipc_conn *con)
330{
331 struct tipc_server *s = con->server;
332 struct socket *sock = NULL;
333 int ret;
334
Ying Xuefa787ae2015-05-13 11:20:38 +0800335 ret = sock_create_kern(s->net, AF_TIPC, SOCK_SEQPACKET, 0, &sock);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400336 if (ret < 0)
337 return NULL;
338 ret = kernel_setsockopt(sock, SOL_TIPC, TIPC_IMPORTANCE,
339 (char *)&s->imp, sizeof(s->imp));
340 if (ret < 0)
341 goto create_err;
342 ret = kernel_bind(sock, (struct sockaddr *)s->saddr, sizeof(*s->saddr));
343 if (ret < 0)
344 goto create_err;
345
346 switch (s->type) {
347 case SOCK_STREAM:
348 case SOCK_SEQPACKET:
349 con->rx_action = tipc_accept_from_sock;
350
351 ret = kernel_listen(sock, 0);
352 if (ret < 0)
353 goto create_err;
354 break;
355 case SOCK_DGRAM:
356 case SOCK_RDM:
357 con->rx_action = tipc_receive_from_sock;
358 break;
359 default:
360 pr_err("Unknown socket type %d\n", s->type);
361 goto create_err;
362 }
Ying Xue76100a82015-03-18 09:32:57 +0800363
364 /* As server's listening socket owner and creator is the same module,
365 * we have to decrease TIPC module reference count to guarantee that
366 * it remains zero after the server socket is created, otherwise,
367 * executing "rmmod" command is unable to make TIPC module deleted
368 * after TIPC module is inserted successfully.
369 *
370 * However, the reference count is ever increased twice in
371 * sock_create_kern(): one is to increase the reference count of owner
372 * of TIPC socket's proto_ops struct; another is to increment the
373 * reference count of owner of TIPC proto struct. Therefore, we must
374 * decrement the module reference count twice to ensure that it keeps
375 * zero after server's listening socket is created. Of course, we
376 * must bump the module reference count twice as well before the socket
377 * is closed.
378 */
379 module_put(sock->ops->owner);
380 module_put(sock->sk->sk_prot_creator->owner);
381 set_bit(CF_SERVER, &con->flags);
382
Ying Xuec5fa7b32013-06-17 10:54:39 -0400383 return sock;
384
385create_err:
Ying Xue76100a82015-03-18 09:32:57 +0800386 kernel_sock_shutdown(sock, SHUT_RDWR);
Ying Xuedef81f62015-04-23 09:37:38 -0400387 sock_release(sock);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400388 return NULL;
389}
390
391static int tipc_open_listening_sock(struct tipc_server *s)
392{
393 struct socket *sock;
394 struct tipc_conn *con;
395
396 con = tipc_alloc_conn(s);
397 if (IS_ERR(con))
398 return PTR_ERR(con);
399
400 sock = tipc_create_listen_sock(con);
Ying Xuec756891a2013-08-01 08:29:18 -0400401 if (!sock) {
402 idr_remove(&s->conn_idr, con->conid);
403 s->idr_in_use--;
404 kfree(con);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400405 return -EINVAL;
Ying Xuec756891a2013-08-01 08:29:18 -0400406 }
Ying Xuec5fa7b32013-06-17 10:54:39 -0400407
408 tipc_register_callbacks(sock, con);
409 return 0;
410}
411
412static struct outqueue_entry *tipc_alloc_entry(void *data, int len)
413{
414 struct outqueue_entry *entry;
415 void *buf;
416
417 entry = kmalloc(sizeof(struct outqueue_entry), GFP_ATOMIC);
418 if (!entry)
419 return NULL;
420
Amitoj Kaur Chawla810bf112016-06-23 10:19:37 +0530421 buf = kmemdup(data, len, GFP_ATOMIC);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400422 if (!buf) {
423 kfree(entry);
424 return NULL;
425 }
426
Ying Xuec5fa7b32013-06-17 10:54:39 -0400427 entry->iov.iov_base = buf;
428 entry->iov.iov_len = len;
429
430 return entry;
431}
432
433static void tipc_free_entry(struct outqueue_entry *e)
434{
435 kfree(e->iov.iov_base);
436 kfree(e);
437}
438
439static void tipc_clean_outqueues(struct tipc_conn *con)
440{
441 struct outqueue_entry *e, *safe;
442
443 spin_lock_bh(&con->outqueue_lock);
444 list_for_each_entry_safe(e, safe, &con->outqueue, list) {
445 list_del(&e->list);
446 tipc_free_entry(e);
447 }
448 spin_unlock_bh(&con->outqueue_lock);
449}
450
451int tipc_conn_sendmsg(struct tipc_server *s, int conid,
452 struct sockaddr_tipc *addr, void *data, size_t len)
453{
454 struct outqueue_entry *e;
455 struct tipc_conn *con;
456
457 con = tipc_conn_lookup(s, conid);
458 if (!con)
459 return -EINVAL;
460
461 e = tipc_alloc_entry(data, len);
462 if (!e) {
463 conn_put(con);
464 return -ENOMEM;
465 }
466
467 if (addr)
468 memcpy(&e->dest, addr, sizeof(struct sockaddr_tipc));
469
470 spin_lock_bh(&con->outqueue_lock);
471 list_add_tail(&e->list, &con->outqueue);
472 spin_unlock_bh(&con->outqueue_lock);
473
Ying Xue4652edb2014-03-06 14:40:17 +0100474 if (test_bit(CF_CONNECTED, &con->flags)) {
Ying Xuec5fa7b32013-06-17 10:54:39 -0400475 if (!queue_work(s->send_wq, &con->swork))
476 conn_put(con);
Ying Xue4652edb2014-03-06 14:40:17 +0100477 } else {
478 conn_put(con);
479 }
Ying Xuec5fa7b32013-06-17 10:54:39 -0400480 return 0;
481}
482
483void tipc_conn_terminate(struct tipc_server *s, int conid)
484{
485 struct tipc_conn *con;
486
487 con = tipc_conn_lookup(s, conid);
488 if (con) {
489 tipc_close_conn(con);
490 conn_put(con);
491 }
492}
493
494static void tipc_send_to_sock(struct tipc_conn *con)
495{
496 int count = 0;
497 struct tipc_server *s = con->server;
498 struct outqueue_entry *e;
499 struct msghdr msg;
500 int ret;
501
502 spin_lock_bh(&con->outqueue_lock);
503 while (1) {
504 e = list_entry(con->outqueue.next, struct outqueue_entry,
505 list);
506 if ((struct list_head *) e == &con->outqueue)
507 break;
508 spin_unlock_bh(&con->outqueue_lock);
509
510 memset(&msg, 0, sizeof(msg));
511 msg.msg_flags = MSG_DONTWAIT;
512
513 if (s->type == SOCK_DGRAM || s->type == SOCK_RDM) {
514 msg.msg_name = &e->dest;
515 msg.msg_namelen = sizeof(struct sockaddr_tipc);
516 }
517 ret = kernel_sendmsg(con->sock, &msg, &e->iov, 1,
518 e->iov.iov_len);
519 if (ret == -EWOULDBLOCK || ret == 0) {
520 cond_resched();
521 goto out;
522 } else if (ret < 0) {
523 goto send_err;
524 }
525
526 /* Don't starve users filling buffers */
527 if (++count >= MAX_SEND_MSG_COUNT) {
528 cond_resched();
529 count = 0;
530 }
531
532 spin_lock_bh(&con->outqueue_lock);
533 list_del(&e->list);
534 tipc_free_entry(e);
535 }
536 spin_unlock_bh(&con->outqueue_lock);
537out:
538 return;
539
540send_err:
541 tipc_close_conn(con);
542}
543
544static void tipc_recv_work(struct work_struct *work)
545{
546 struct tipc_conn *con = container_of(work, struct tipc_conn, rwork);
547 int count = 0;
548
549 while (test_bit(CF_CONNECTED, &con->flags)) {
550 if (con->rx_action(con))
551 break;
552
553 /* Don't flood Rx machine */
554 if (++count >= MAX_RECV_MSG_COUNT) {
555 cond_resched();
556 count = 0;
557 }
558 }
559 conn_put(con);
560}
561
562static void tipc_send_work(struct work_struct *work)
563{
564 struct tipc_conn *con = container_of(work, struct tipc_conn, swork);
565
566 if (test_bit(CF_CONNECTED, &con->flags))
567 tipc_send_to_sock(con);
568
569 conn_put(con);
570}
571
572static void tipc_work_stop(struct tipc_server *s)
573{
574 destroy_workqueue(s->rcv_wq);
575 destroy_workqueue(s->send_wq);
576}
577
578static int tipc_work_start(struct tipc_server *s)
579{
Parthasarathy Bhuvaragan06c85812016-02-02 10:52:17 +0100580 s->rcv_wq = alloc_ordered_workqueue("tipc_rcv", 0);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400581 if (!s->rcv_wq) {
582 pr_err("can't start tipc receive workqueue\n");
583 return -ENOMEM;
584 }
585
Parthasarathy Bhuvaragan06c85812016-02-02 10:52:17 +0100586 s->send_wq = alloc_ordered_workqueue("tipc_send", 0);
Ying Xuec5fa7b32013-06-17 10:54:39 -0400587 if (!s->send_wq) {
588 pr_err("can't start tipc send workqueue\n");
589 destroy_workqueue(s->rcv_wq);
590 return -ENOMEM;
591 }
592
593 return 0;
594}
595
596int tipc_server_start(struct tipc_server *s)
597{
598 int ret;
599
600 spin_lock_init(&s->idr_lock);
601 idr_init(&s->conn_idr);
602 s->idr_in_use = 0;
603
604 s->rcvbuf_cache = kmem_cache_create(s->name, s->max_rcvbuf_size,
605 0, SLAB_HWCACHE_ALIGN, NULL);
606 if (!s->rcvbuf_cache)
607 return -ENOMEM;
608
609 ret = tipc_work_start(s);
610 if (ret < 0) {
611 kmem_cache_destroy(s->rcvbuf_cache);
612 return ret;
613 }
Ying Xuec756891a2013-08-01 08:29:18 -0400614 ret = tipc_open_listening_sock(s);
615 if (ret < 0) {
616 tipc_work_stop(s);
617 kmem_cache_destroy(s->rcvbuf_cache);
618 return ret;
619 }
Ying Xuec756891a2013-08-01 08:29:18 -0400620 return ret;
Ying Xuec5fa7b32013-06-17 10:54:39 -0400621}
622
623void tipc_server_stop(struct tipc_server *s)
624{
625 struct tipc_conn *con;
626 int total = 0;
627 int id;
628
Ying Xuec5fa7b32013-06-17 10:54:39 -0400629 spin_lock_bh(&s->idr_lock);
630 for (id = 0; total < s->idr_in_use; id++) {
631 con = idr_find(&s->conn_idr, id);
632 if (con) {
633 total++;
634 spin_unlock_bh(&s->idr_lock);
635 tipc_close_conn(con);
636 spin_lock_bh(&s->idr_lock);
637 }
638 }
639 spin_unlock_bh(&s->idr_lock);
640
641 tipc_work_stop(s);
642 kmem_cache_destroy(s->rcvbuf_cache);
643 idr_destroy(&s->conn_idr);
644}