1 /*
2  * net/tipc/bearer.c: TIPC bearer code
3  *
4  * Copyright (c) 1996-2006, Ericsson AB
5  * Copyright (c) 2004-2006, 2010-2011, Wind River Systems
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the names of the copyright holders nor the names of its
17  *    contributors may be used to endorse or promote products derived from
18  *    this software without specific prior written permission.
19  *
20  * Alternatively, this software may be distributed under the terms of the
21  * GNU General Public License ("GPL") version 2 as published by the Free
22  * Software Foundation.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34  * POSSIBILITY OF SUCH DAMAGE.
35  */
36 
37 #include "core.h"
38 #include "config.h"
39 #include "bearer.h"
40 #include "discover.h"
41 
42 #define MAX_ADDR_STR 32
43 
44 static struct tipc_media *media_list[MAX_MEDIA];
45 static u32 media_count;
46 
47 struct tipc_bearer tipc_bearers[MAX_BEARERS];
48 
49 static void bearer_disable(struct tipc_bearer *b_ptr);
50 
51 /**
52  * media_name_valid - validate media name
53  *
54  * Returns 1 if media name is valid, otherwise 0.
55  */
56 
media_name_valid(const char * name)57 static int media_name_valid(const char *name)
58 {
59 	u32 len;
60 
61 	len = strlen(name);
62 	if ((len + 1) > TIPC_MAX_MEDIA_NAME)
63 		return 0;
64 	return strspn(name, tipc_alphabet) == len;
65 }
66 
67 /**
68  * tipc_media_find - locates specified media object by name
69  */
70 
tipc_media_find(const char * name)71 struct tipc_media *tipc_media_find(const char *name)
72 {
73 	u32 i;
74 
75 	for (i = 0; i < media_count; i++) {
76 		if (!strcmp(media_list[i]->name, name))
77 			return media_list[i];
78 	}
79 	return NULL;
80 }
81 
82 /**
83  * media_find_id - locates specified media object by type identifier
84  */
85 
media_find_id(u8 type)86 static struct tipc_media *media_find_id(u8 type)
87 {
88 	u32 i;
89 
90 	for (i = 0; i < media_count; i++) {
91 		if (media_list[i]->type_id == type)
92 			return media_list[i];
93 	}
94 	return NULL;
95 }
96 
97 /**
98  * tipc_register_media - register a media type
99  *
100  * Bearers for this media type must be activated separately at a later stage.
101  */
102 
tipc_register_media(struct tipc_media * m_ptr)103 int tipc_register_media(struct tipc_media *m_ptr)
104 {
105 	int res = -EINVAL;
106 
107 	write_lock_bh(&tipc_net_lock);
108 
109 	if (!media_name_valid(m_ptr->name))
110 		goto exit;
111 	if ((m_ptr->bcast_addr.media_id != m_ptr->type_id) ||
112 	    !m_ptr->bcast_addr.broadcast)
113 		goto exit;
114 	if (m_ptr->priority > TIPC_MAX_LINK_PRI)
115 		goto exit;
116 	if ((m_ptr->tolerance < TIPC_MIN_LINK_TOL) ||
117 	    (m_ptr->tolerance > TIPC_MAX_LINK_TOL))
118 		goto exit;
119 	if (media_count >= MAX_MEDIA)
120 		goto exit;
121 	if (tipc_media_find(m_ptr->name) || media_find_id(m_ptr->type_id))
122 		goto exit;
123 
124 	media_list[media_count] = m_ptr;
125 	media_count++;
126 	res = 0;
127 exit:
128 	write_unlock_bh(&tipc_net_lock);
129 	if (res)
130 		warn("Media <%s> registration error\n", m_ptr->name);
131 	return res;
132 }
133 
134 /**
135  * tipc_media_addr_printf - record media address in print buffer
136  */
137 
tipc_media_addr_printf(struct print_buf * pb,struct tipc_media_addr * a)138 void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a)
139 {
140 	char addr_str[MAX_ADDR_STR];
141 	struct tipc_media *m_ptr;
142 
143 	m_ptr = media_find_id(a->media_id);
144 
145 	if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
146 		tipc_printf(pb, "%s(%s)", m_ptr->name, addr_str);
147 	else {
148 		u32 i;
149 
150 		tipc_printf(pb, "UNKNOWN(%u)", a->media_id);
151 		for (i = 0; i < sizeof(a->value); i++)
152 			tipc_printf(pb, "-%02x", a->value[i]);
153 	}
154 }
155 
156 /**
157  * tipc_media_get_names - record names of registered media in buffer
158  */
159 
tipc_media_get_names(void)160 struct sk_buff *tipc_media_get_names(void)
161 {
162 	struct sk_buff *buf;
163 	int i;
164 
165 	buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
166 	if (!buf)
167 		return NULL;
168 
169 	read_lock_bh(&tipc_net_lock);
170 	for (i = 0; i < media_count; i++) {
171 		tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
172 				    media_list[i]->name,
173 				    strlen(media_list[i]->name) + 1);
174 	}
175 	read_unlock_bh(&tipc_net_lock);
176 	return buf;
177 }
178 
179 /**
180  * bearer_name_validate - validate & (optionally) deconstruct bearer name
181  * @name - ptr to bearer name string
182  * @name_parts - ptr to area for bearer name components (or NULL if not needed)
183  *
184  * Returns 1 if bearer name is valid, otherwise 0.
185  */
186 
bearer_name_validate(const char * name,struct tipc_bearer_names * name_parts)187 static int bearer_name_validate(const char *name,
188 				struct tipc_bearer_names *name_parts)
189 {
190 	char name_copy[TIPC_MAX_BEARER_NAME];
191 	char *media_name;
192 	char *if_name;
193 	u32 media_len;
194 	u32 if_len;
195 
196 	/* copy bearer name & ensure length is OK */
197 
198 	name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
199 	/* need above in case non-Posix strncpy() doesn't pad with nulls */
200 	strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
201 	if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
202 		return 0;
203 
204 	/* ensure all component parts of bearer name are present */
205 
206 	media_name = name_copy;
207 	if_name = strchr(media_name, ':');
208 	if (if_name == NULL)
209 		return 0;
210 	*(if_name++) = 0;
211 	media_len = if_name - media_name;
212 	if_len = strlen(if_name) + 1;
213 
214 	/* validate component parts of bearer name */
215 
216 	if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
217 	    (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) ||
218 	    (strspn(media_name, tipc_alphabet) != (media_len - 1)) ||
219 	    (strspn(if_name, tipc_alphabet) != (if_len - 1)))
220 		return 0;
221 
222 	/* return bearer name components, if necessary */
223 
224 	if (name_parts) {
225 		strcpy(name_parts->media_name, media_name);
226 		strcpy(name_parts->if_name, if_name);
227 	}
228 	return 1;
229 }
230 
231 /**
232  * tipc_bearer_find - locates bearer object with matching bearer name
233  */
234 
tipc_bearer_find(const char * name)235 struct tipc_bearer *tipc_bearer_find(const char *name)
236 {
237 	struct tipc_bearer *b_ptr;
238 	u32 i;
239 
240 	for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
241 		if (b_ptr->active && (!strcmp(b_ptr->name, name)))
242 			return b_ptr;
243 	}
244 	return NULL;
245 }
246 
247 /**
248  * tipc_bearer_find_interface - locates bearer object with matching interface name
249  */
250 
tipc_bearer_find_interface(const char * if_name)251 struct tipc_bearer *tipc_bearer_find_interface(const char *if_name)
252 {
253 	struct tipc_bearer *b_ptr;
254 	char *b_if_name;
255 	u32 i;
256 
257 	for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
258 		if (!b_ptr->active)
259 			continue;
260 		b_if_name = strchr(b_ptr->name, ':') + 1;
261 		if (!strcmp(b_if_name, if_name))
262 			return b_ptr;
263 	}
264 	return NULL;
265 }
266 
267 /**
268  * tipc_bearer_get_names - record names of bearers in buffer
269  */
270 
tipc_bearer_get_names(void)271 struct sk_buff *tipc_bearer_get_names(void)
272 {
273 	struct sk_buff *buf;
274 	struct tipc_bearer *b_ptr;
275 	int i, j;
276 
277 	buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME));
278 	if (!buf)
279 		return NULL;
280 
281 	read_lock_bh(&tipc_net_lock);
282 	for (i = 0; i < media_count; i++) {
283 		for (j = 0; j < MAX_BEARERS; j++) {
284 			b_ptr = &tipc_bearers[j];
285 			if (b_ptr->active && (b_ptr->media == media_list[i])) {
286 				tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME,
287 						    b_ptr->name,
288 						    strlen(b_ptr->name) + 1);
289 			}
290 		}
291 	}
292 	read_unlock_bh(&tipc_net_lock);
293 	return buf;
294 }
295 
tipc_bearer_add_dest(struct tipc_bearer * b_ptr,u32 dest)296 void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest)
297 {
298 	tipc_nmap_add(&b_ptr->nodes, dest);
299 	tipc_bcbearer_sort();
300 	tipc_disc_add_dest(b_ptr->link_req);
301 }
302 
tipc_bearer_remove_dest(struct tipc_bearer * b_ptr,u32 dest)303 void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest)
304 {
305 	tipc_nmap_remove(&b_ptr->nodes, dest);
306 	tipc_bcbearer_sort();
307 	tipc_disc_remove_dest(b_ptr->link_req);
308 }
309 
310 /*
311  * bearer_push(): Resolve bearer congestion. Force the waiting
312  * links to push out their unsent packets, one packet per link
313  * per iteration, until all packets are gone or congestion reoccurs.
314  * 'tipc_net_lock' is read_locked when this function is called
315  * bearer.lock must be taken before calling
316  * Returns binary true(1) ore false(0)
317  */
bearer_push(struct tipc_bearer * b_ptr)318 static int bearer_push(struct tipc_bearer *b_ptr)
319 {
320 	u32 res = 0;
321 	struct tipc_link *ln, *tln;
322 
323 	if (b_ptr->blocked)
324 		return 0;
325 
326 	while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) {
327 		list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) {
328 			res = tipc_link_push_packet(ln);
329 			if (res == PUSH_FAILED)
330 				break;
331 			if (res == PUSH_FINISHED)
332 				list_move_tail(&ln->link_list, &b_ptr->links);
333 		}
334 	}
335 	return list_empty(&b_ptr->cong_links);
336 }
337 
tipc_bearer_lock_push(struct tipc_bearer * b_ptr)338 void tipc_bearer_lock_push(struct tipc_bearer *b_ptr)
339 {
340 	spin_lock_bh(&b_ptr->lock);
341 	bearer_push(b_ptr);
342 	spin_unlock_bh(&b_ptr->lock);
343 }
344 
345 
346 /*
347  * Interrupt enabling new requests after bearer congestion or blocking:
348  * See bearer_send().
349  */
tipc_continue(struct tipc_bearer * b_ptr)350 void tipc_continue(struct tipc_bearer *b_ptr)
351 {
352 	spin_lock_bh(&b_ptr->lock);
353 	if (!list_empty(&b_ptr->cong_links))
354 		tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
355 	b_ptr->blocked = 0;
356 	spin_unlock_bh(&b_ptr->lock);
357 }
358 
359 /*
360  * Schedule link for sending of messages after the bearer
361  * has been deblocked by 'continue()'. This method is called
362  * when somebody tries to send a message via this link while
363  * the bearer is congested. 'tipc_net_lock' is in read_lock here
364  * bearer.lock is busy
365  */
366 
tipc_bearer_schedule_unlocked(struct tipc_bearer * b_ptr,struct tipc_link * l_ptr)367 static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr,
368 						struct tipc_link *l_ptr)
369 {
370 	list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
371 }
372 
373 /*
374  * Schedule link for sending of messages after the bearer
375  * has been deblocked by 'continue()'. This method is called
376  * when somebody tries to send a message via this link while
377  * the bearer is congested. 'tipc_net_lock' is in read_lock here,
378  * bearer.lock is free
379  */
380 
tipc_bearer_schedule(struct tipc_bearer * b_ptr,struct tipc_link * l_ptr)381 void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr)
382 {
383 	spin_lock_bh(&b_ptr->lock);
384 	tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
385 	spin_unlock_bh(&b_ptr->lock);
386 }
387 
388 
389 /*
390  * tipc_bearer_resolve_congestion(): Check if there is bearer congestion,
391  * and if there is, try to resolve it before returning.
392  * 'tipc_net_lock' is read_locked when this function is called
393  */
tipc_bearer_resolve_congestion(struct tipc_bearer * b_ptr,struct tipc_link * l_ptr)394 int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr,
395 					struct tipc_link *l_ptr)
396 {
397 	int res = 1;
398 
399 	if (list_empty(&b_ptr->cong_links))
400 		return 1;
401 	spin_lock_bh(&b_ptr->lock);
402 	if (!bearer_push(b_ptr)) {
403 		tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
404 		res = 0;
405 	}
406 	spin_unlock_bh(&b_ptr->lock);
407 	return res;
408 }
409 
410 /**
411  * tipc_bearer_congested - determines if bearer is currently congested
412  */
413 
tipc_bearer_congested(struct tipc_bearer * b_ptr,struct tipc_link * l_ptr)414 int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr)
415 {
416 	if (unlikely(b_ptr->blocked))
417 		return 1;
418 	if (likely(list_empty(&b_ptr->cong_links)))
419 		return 0;
420 	return !tipc_bearer_resolve_congestion(b_ptr, l_ptr);
421 }
422 
423 /**
424  * tipc_enable_bearer - enable bearer with the given name
425  */
426 
tipc_enable_bearer(const char * name,u32 disc_domain,u32 priority)427 int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
428 {
429 	struct tipc_bearer *b_ptr;
430 	struct tipc_media *m_ptr;
431 	struct tipc_bearer_names b_names;
432 	char addr_string[16];
433 	u32 bearer_id;
434 	u32 with_this_prio;
435 	u32 i;
436 	int res = -EINVAL;
437 
438 	if (!tipc_own_addr) {
439 		warn("Bearer <%s> rejected, not supported in standalone mode\n",
440 		     name);
441 		return -ENOPROTOOPT;
442 	}
443 	if (!bearer_name_validate(name, &b_names)) {
444 		warn("Bearer <%s> rejected, illegal name\n", name);
445 		return -EINVAL;
446 	}
447 	if (tipc_addr_domain_valid(disc_domain) &&
448 	    (disc_domain != tipc_own_addr)) {
449 		if (tipc_in_scope(disc_domain, tipc_own_addr)) {
450 			disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK;
451 			res = 0;   /* accept any node in own cluster */
452 		} else if (in_own_cluster(disc_domain))
453 			res = 0;   /* accept specified node in own cluster */
454 	}
455 	if (res) {
456 		warn("Bearer <%s> rejected, illegal discovery domain\n", name);
457 		return -EINVAL;
458 	}
459 	if ((priority > TIPC_MAX_LINK_PRI) &&
460 	    (priority != TIPC_MEDIA_LINK_PRI)) {
461 		warn("Bearer <%s> rejected, illegal priority\n", name);
462 		return -EINVAL;
463 	}
464 
465 	write_lock_bh(&tipc_net_lock);
466 
467 	m_ptr = tipc_media_find(b_names.media_name);
468 	if (!m_ptr) {
469 		warn("Bearer <%s> rejected, media <%s> not registered\n", name,
470 		     b_names.media_name);
471 		goto exit;
472 	}
473 
474 	if (priority == TIPC_MEDIA_LINK_PRI)
475 		priority = m_ptr->priority;
476 
477 restart:
478 	bearer_id = MAX_BEARERS;
479 	with_this_prio = 1;
480 	for (i = MAX_BEARERS; i-- != 0; ) {
481 		if (!tipc_bearers[i].active) {
482 			bearer_id = i;
483 			continue;
484 		}
485 		if (!strcmp(name, tipc_bearers[i].name)) {
486 			warn("Bearer <%s> rejected, already enabled\n", name);
487 			goto exit;
488 		}
489 		if ((tipc_bearers[i].priority == priority) &&
490 		    (++with_this_prio > 2)) {
491 			if (priority-- == 0) {
492 				warn("Bearer <%s> rejected, duplicate priority\n",
493 				     name);
494 				goto exit;
495 			}
496 			warn("Bearer <%s> priority adjustment required %u->%u\n",
497 			     name, priority + 1, priority);
498 			goto restart;
499 		}
500 	}
501 	if (bearer_id >= MAX_BEARERS) {
502 		warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
503 		     name, MAX_BEARERS);
504 		goto exit;
505 	}
506 
507 	b_ptr = &tipc_bearers[bearer_id];
508 	strcpy(b_ptr->name, name);
509 	res = m_ptr->enable_bearer(b_ptr);
510 	if (res) {
511 		warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res);
512 		goto exit;
513 	}
514 
515 	b_ptr->identity = bearer_id;
516 	b_ptr->media = m_ptr;
517 	b_ptr->tolerance = m_ptr->tolerance;
518 	b_ptr->window = m_ptr->window;
519 	b_ptr->net_plane = bearer_id + 'A';
520 	b_ptr->active = 1;
521 	b_ptr->priority = priority;
522 	INIT_LIST_HEAD(&b_ptr->cong_links);
523 	INIT_LIST_HEAD(&b_ptr->links);
524 	spin_lock_init(&b_ptr->lock);
525 
526 	res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain);
527 	if (res) {
528 		bearer_disable(b_ptr);
529 		warn("Bearer <%s> rejected, discovery object creation failed\n",
530 		     name);
531 		goto exit;
532 	}
533 	info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
534 	     name, tipc_addr_string_fill(addr_string, disc_domain), priority);
535 exit:
536 	write_unlock_bh(&tipc_net_lock);
537 	return res;
538 }
539 
540 /**
541  * tipc_block_bearer(): Block the bearer with the given name,
542  *                      and reset all its links
543  */
544 
tipc_block_bearer(const char * name)545 int tipc_block_bearer(const char *name)
546 {
547 	struct tipc_bearer *b_ptr = NULL;
548 	struct tipc_link *l_ptr;
549 	struct tipc_link *temp_l_ptr;
550 
551 	read_lock_bh(&tipc_net_lock);
552 	b_ptr = tipc_bearer_find(name);
553 	if (!b_ptr) {
554 		warn("Attempt to block unknown bearer <%s>\n", name);
555 		read_unlock_bh(&tipc_net_lock);
556 		return -EINVAL;
557 	}
558 
559 	info("Blocking bearer <%s>\n", name);
560 	spin_lock_bh(&b_ptr->lock);
561 	b_ptr->blocked = 1;
562 	list_splice_init(&b_ptr->cong_links, &b_ptr->links);
563 	list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
564 		struct tipc_node *n_ptr = l_ptr->owner;
565 
566 		spin_lock_bh(&n_ptr->lock);
567 		tipc_link_reset(l_ptr);
568 		spin_unlock_bh(&n_ptr->lock);
569 	}
570 	spin_unlock_bh(&b_ptr->lock);
571 	read_unlock_bh(&tipc_net_lock);
572 	return 0;
573 }
574 
575 /**
576  * bearer_disable -
577  *
578  * Note: This routine assumes caller holds tipc_net_lock.
579  */
580 
bearer_disable(struct tipc_bearer * b_ptr)581 static void bearer_disable(struct tipc_bearer *b_ptr)
582 {
583 	struct tipc_link *l_ptr;
584 	struct tipc_link *temp_l_ptr;
585 
586 	info("Disabling bearer <%s>\n", b_ptr->name);
587 	spin_lock_bh(&b_ptr->lock);
588 	b_ptr->blocked = 1;
589 	b_ptr->media->disable_bearer(b_ptr);
590 	list_splice_init(&b_ptr->cong_links, &b_ptr->links);
591 	list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
592 		tipc_link_delete(l_ptr);
593 	}
594 	if (b_ptr->link_req)
595 		tipc_disc_delete(b_ptr->link_req);
596 	spin_unlock_bh(&b_ptr->lock);
597 	memset(b_ptr, 0, sizeof(struct tipc_bearer));
598 }
599 
tipc_disable_bearer(const char * name)600 int tipc_disable_bearer(const char *name)
601 {
602 	struct tipc_bearer *b_ptr;
603 	int res;
604 
605 	write_lock_bh(&tipc_net_lock);
606 	b_ptr = tipc_bearer_find(name);
607 	if (b_ptr == NULL) {
608 		warn("Attempt to disable unknown bearer <%s>\n", name);
609 		res = -EINVAL;
610 	} else {
611 		bearer_disable(b_ptr);
612 		res = 0;
613 	}
614 	write_unlock_bh(&tipc_net_lock);
615 	return res;
616 }
617 
618 
619 
tipc_bearer_stop(void)620 void tipc_bearer_stop(void)
621 {
622 	u32 i;
623 
624 	for (i = 0; i < MAX_BEARERS; i++) {
625 		if (tipc_bearers[i].active)
626 			bearer_disable(&tipc_bearers[i]);
627 	}
628 	media_count = 0;
629 }
630