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1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, 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 <net/sock.h>
38#include "core.h"
39#include "bearer.h"
40#include "link.h"
41#include "discover.h"
42#include "monitor.h"
43#include "bcast.h"
44#include "netlink.h"
45#include "udp_media.h"
46#include "trace.h"
47#include "crypto.h"
48
49#define MAX_ADDR_STR 60
50
51static struct tipc_media * const media_info_array[] = {
52 ð_media_info,
53#ifdef CONFIG_TIPC_MEDIA_IB
54 &ib_media_info,
55#endif
56#ifdef CONFIG_TIPC_MEDIA_UDP
57 &udp_media_info,
58#endif
59 NULL
60};
61
62static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
63{
64 struct tipc_net *tn = tipc_net(net);
65
66 return rcu_dereference(tn->bearer_list[bearer_id]);
67}
68
69static void bearer_disable(struct net *net, struct tipc_bearer *b);
70static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
71 struct packet_type *pt, struct net_device *orig_dev);
72
73/**
74 * tipc_media_find - locates specified media object by name
75 * @name: name to locate
76 */
77struct tipc_media *tipc_media_find(const char *name)
78{
79 u32 i;
80
81 for (i = 0; media_info_array[i] != NULL; i++) {
82 if (!strcmp(media_info_array[i]->name, name))
83 break;
84 }
85 return media_info_array[i];
86}
87
88/**
89 * media_find_id - locates specified media object by type identifier
90 * @type: type identifier to locate
91 */
92static struct tipc_media *media_find_id(u8 type)
93{
94 u32 i;
95
96 for (i = 0; media_info_array[i] != NULL; i++) {
97 if (media_info_array[i]->type_id == type)
98 break;
99 }
100 return media_info_array[i];
101}
102
103/**
104 * tipc_media_addr_printf - record media address in print buffer
105 * @buf: output buffer
106 * @len: output buffer size remaining
107 * @a: input media address
108 */
109int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
110{
111 char addr_str[MAX_ADDR_STR];
112 struct tipc_media *m;
113 int ret;
114
115 m = media_find_id(a->media_id);
116
117 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
118 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
119 else {
120 u32 i;
121
122 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
123 for (i = 0; i < sizeof(a->value); i++)
124 ret += scnprintf(buf + ret, len - ret,
125 "-%x", a->value[i]);
126 }
127 return ret;
128}
129
130/**
131 * bearer_name_validate - validate & (optionally) deconstruct bearer name
132 * @name: ptr to bearer name string
133 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
134 *
135 * Return: 1 if bearer name is valid, otherwise 0.
136 */
137static int bearer_name_validate(const char *name,
138 struct tipc_bearer_names *name_parts)
139{
140 char name_copy[TIPC_MAX_BEARER_NAME];
141 char *media_name;
142 char *if_name;
143 u32 media_len;
144 u32 if_len;
145
146 /* copy bearer name & ensure length is OK */
147 if (strscpy(name_copy, name, TIPC_MAX_BEARER_NAME) < 0)
148 return 0;
149
150 /* ensure all component parts of bearer name are present */
151 media_name = name_copy;
152 if_name = strchr(media_name, ':');
153 if (if_name == NULL)
154 return 0;
155 *(if_name++) = 0;
156 media_len = if_name - media_name;
157 if_len = strlen(if_name) + 1;
158
159 /* validate component parts of bearer name */
160 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
161 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
162 return 0;
163
164 /* return bearer name components, if necessary */
165 if (name_parts) {
166 if (strscpy(name_parts->media_name, media_name,
167 TIPC_MAX_MEDIA_NAME) < 0)
168 return 0;
169 if (strscpy(name_parts->if_name, if_name,
170 TIPC_MAX_IF_NAME) < 0)
171 return 0;
172 }
173 return 1;
174}
175
176/**
177 * tipc_bearer_find - locates bearer object with matching bearer name
178 * @net: the applicable net namespace
179 * @name: bearer name to locate
180 */
181struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
182{
183 struct tipc_net *tn = tipc_net(net);
184 struct tipc_bearer *b;
185 u32 i;
186
187 for (i = 0; i < MAX_BEARERS; i++) {
188 b = rtnl_dereference(tn->bearer_list[i]);
189 if (b && (!strcmp(b->name, name)))
190 return b;
191 }
192 return NULL;
193}
194
195/* tipc_bearer_get_name - get the bearer name from its id.
196 * @net: network namespace
197 * @name: a pointer to the buffer where the name will be stored.
198 * @bearer_id: the id to get the name from.
199 */
200int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
201{
202 struct tipc_net *tn = tipc_net(net);
203 struct tipc_bearer *b;
204
205 if (bearer_id >= MAX_BEARERS)
206 return -EINVAL;
207
208 b = rtnl_dereference(tn->bearer_list[bearer_id]);
209 if (!b)
210 return -EINVAL;
211
212 strcpy(name, b->name);
213 return 0;
214}
215
216void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
217{
218 struct tipc_bearer *b;
219
220 rcu_read_lock();
221 b = bearer_get(net, bearer_id);
222 if (b)
223 tipc_disc_add_dest(b->disc);
224 rcu_read_unlock();
225}
226
227void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
228{
229 struct tipc_bearer *b;
230
231 rcu_read_lock();
232 b = bearer_get(net, bearer_id);
233 if (b)
234 tipc_disc_remove_dest(b->disc);
235 rcu_read_unlock();
236}
237
238/**
239 * tipc_enable_bearer - enable bearer with the given name
240 * @net: the applicable net namespace
241 * @name: bearer name to enable
242 * @disc_domain: bearer domain
243 * @prio: bearer priority
244 * @attr: nlattr array
245 * @extack: netlink extended ack
246 */
247static int tipc_enable_bearer(struct net *net, const char *name,
248 u32 disc_domain, u32 prio,
249 struct nlattr *attr[],
250 struct netlink_ext_ack *extack)
251{
252 struct tipc_net *tn = tipc_net(net);
253 struct tipc_bearer_names b_names;
254 int with_this_prio = 1;
255 struct tipc_bearer *b;
256 struct tipc_media *m;
257 struct sk_buff *skb;
258 int bearer_id = 0;
259 int res = -EINVAL;
260 char *errstr = "";
261 u32 i;
262
263 if (!bearer_name_validate(name, &b_names)) {
264 NL_SET_ERR_MSG(extack, "Illegal name");
265 return res;
266 }
267
268 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
269 errstr = "illegal priority";
270 NL_SET_ERR_MSG(extack, "Illegal priority");
271 goto rejected;
272 }
273
274 m = tipc_media_find(b_names.media_name);
275 if (!m) {
276 errstr = "media not registered";
277 NL_SET_ERR_MSG(extack, "Media not registered");
278 goto rejected;
279 }
280
281 if (prio == TIPC_MEDIA_LINK_PRI)
282 prio = m->priority;
283
284 /* Check new bearer vs existing ones and find free bearer id if any */
285 bearer_id = MAX_BEARERS;
286 i = MAX_BEARERS;
287 while (i-- != 0) {
288 b = rtnl_dereference(tn->bearer_list[i]);
289 if (!b) {
290 bearer_id = i;
291 continue;
292 }
293 if (!strcmp(name, b->name)) {
294 errstr = "already enabled";
295 NL_SET_ERR_MSG(extack, "Already enabled");
296 goto rejected;
297 }
298
299 if (b->priority == prio &&
300 (++with_this_prio > 2)) {
301 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
302 name, prio);
303
304 if (prio == TIPC_MIN_LINK_PRI) {
305 errstr = "cannot adjust to lower";
306 NL_SET_ERR_MSG(extack, "Cannot adjust to lower");
307 goto rejected;
308 }
309
310 pr_warn("Bearer <%s>: trying with adjusted priority\n",
311 name);
312 prio--;
313 bearer_id = MAX_BEARERS;
314 i = MAX_BEARERS;
315 with_this_prio = 1;
316 }
317 }
318
319 if (bearer_id >= MAX_BEARERS) {
320 errstr = "max 3 bearers permitted";
321 NL_SET_ERR_MSG(extack, "Max 3 bearers permitted");
322 goto rejected;
323 }
324
325 b = kzalloc(sizeof(*b), GFP_ATOMIC);
326 if (!b)
327 return -ENOMEM;
328
329 strscpy(b->name, name);
330 b->media = m;
331 res = m->enable_media(net, b, attr);
332 if (res) {
333 kfree(b);
334 errstr = "failed to enable media";
335 NL_SET_ERR_MSG(extack, "Failed to enable media");
336 goto rejected;
337 }
338
339 b->identity = bearer_id;
340 b->tolerance = m->tolerance;
341 b->min_win = m->min_win;
342 b->max_win = m->max_win;
343 b->domain = disc_domain;
344 b->net_plane = bearer_id + 'A';
345 b->priority = prio;
346 refcount_set(&b->refcnt, 1);
347
348 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
349 if (res) {
350 bearer_disable(net, b);
351 errstr = "failed to create discoverer";
352 NL_SET_ERR_MSG(extack, "Failed to create discoverer");
353 goto rejected;
354 }
355
356 /* Create monitoring data before accepting activate messages */
357 if (tipc_mon_create(net, bearer_id)) {
358 bearer_disable(net, b);
359 kfree_skb(skb);
360 return -ENOMEM;
361 }
362
363 test_and_set_bit_lock(0, &b->up);
364 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
365 if (skb)
366 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
367
368 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
369
370 return res;
371rejected:
372 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
373 return res;
374}
375
376/**
377 * tipc_reset_bearer - Reset all links established over this bearer
378 * @net: the applicable net namespace
379 * @b: the target bearer
380 */
381static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
382{
383 pr_info("Resetting bearer <%s>\n", b->name);
384 tipc_node_delete_links(net, b->identity);
385 tipc_disc_reset(net, b);
386 return 0;
387}
388
389bool tipc_bearer_hold(struct tipc_bearer *b)
390{
391 return (b && refcount_inc_not_zero(&b->refcnt));
392}
393
394void tipc_bearer_put(struct tipc_bearer *b)
395{
396 if (b && refcount_dec_and_test(&b->refcnt))
397 kfree_rcu(b, rcu);
398}
399
400/**
401 * bearer_disable - disable this bearer
402 * @net: the applicable net namespace
403 * @b: the bearer to disable
404 *
405 * Note: This routine assumes caller holds RTNL lock.
406 */
407static void bearer_disable(struct net *net, struct tipc_bearer *b)
408{
409 struct tipc_net *tn = tipc_net(net);
410 int bearer_id = b->identity;
411
412 pr_info("Disabling bearer <%s>\n", b->name);
413 clear_bit_unlock(0, &b->up);
414 tipc_node_delete_links(net, bearer_id);
415 b->media->disable_media(b);
416 RCU_INIT_POINTER(b->media_ptr, NULL);
417 if (b->disc)
418 tipc_disc_delete(b->disc);
419 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
420 tipc_bearer_put(b);
421 tipc_mon_delete(net, bearer_id);
422}
423
424int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
425 struct nlattr *attr[])
426{
427 char *dev_name = strchr((const char *)b->name, ':') + 1;
428 int hwaddr_len = b->media->hwaddr_len;
429 u8 node_id[NODE_ID_LEN] = {0,};
430 struct net_device *dev;
431
432 /* Find device with specified name */
433 dev = dev_get_by_name(net, dev_name);
434 if (!dev)
435 return -ENODEV;
436 if (tipc_mtu_bad(dev)) {
437 dev_put(dev);
438 return -EINVAL;
439 }
440 if (dev == net->loopback_dev) {
441 dev_put(dev);
442 pr_info("Enabling <%s> not permitted\n", b->name);
443 return -EINVAL;
444 }
445
446 /* Autoconfigure own node identity if needed */
447 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
448 memcpy(node_id, dev->dev_addr, hwaddr_len);
449 tipc_net_init(net, node_id, 0);
450 }
451 if (!tipc_own_id(net)) {
452 dev_put(dev);
453 pr_warn("Failed to obtain node identity\n");
454 return -EINVAL;
455 }
456
457 /* Associate TIPC bearer with L2 bearer */
458 rcu_assign_pointer(b->media_ptr, dev);
459 b->pt.dev = dev;
460 b->pt.type = htons(ETH_P_TIPC);
461 b->pt.func = tipc_l2_rcv_msg;
462 dev_add_pack(&b->pt);
463 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
464 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
465 b->bcast_addr.media_id = b->media->type_id;
466 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
467 b->mtu = dev->mtu;
468 b->media->raw2addr(b, &b->addr, (const char *)dev->dev_addr);
469 rcu_assign_pointer(dev->tipc_ptr, b);
470 return 0;
471}
472
473/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
474 * @b: the target bearer
475 *
476 * Mark L2 bearer as inactive so that incoming buffers are thrown away
477 */
478void tipc_disable_l2_media(struct tipc_bearer *b)
479{
480 struct net_device *dev;
481
482 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
483 dev_remove_pack(&b->pt);
484 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
485 synchronize_net();
486 dev_put(dev);
487}
488
489/**
490 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
491 * @net: the associated network namespace
492 * @skb: the packet to be sent
493 * @b: the bearer through which the packet is to be sent
494 * @dest: peer destination address
495 */
496int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
497 struct tipc_bearer *b, struct tipc_media_addr *dest)
498{
499 struct net_device *dev;
500 int delta;
501
502 dev = (struct net_device *)rcu_dereference(b->media_ptr);
503 if (!dev)
504 return 0;
505
506 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
507 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
508 kfree_skb(skb);
509 return 0;
510 }
511 skb_reset_network_header(skb);
512 skb->dev = dev;
513 skb->protocol = htons(ETH_P_TIPC);
514 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
515 dev->dev_addr, skb->len);
516 dev_queue_xmit(skb);
517 return 0;
518}
519
520bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
521{
522 bool supp = false;
523 struct tipc_bearer *b;
524
525 rcu_read_lock();
526 b = bearer_get(net, bearer_id);
527 if (b)
528 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
529 rcu_read_unlock();
530 return supp;
531}
532
533int tipc_bearer_mtu(struct net *net, u32 bearer_id)
534{
535 int mtu = 0;
536 struct tipc_bearer *b;
537
538 rcu_read_lock();
539 b = bearer_get(net, bearer_id);
540 if (b)
541 mtu = b->mtu;
542 rcu_read_unlock();
543 return mtu;
544}
545
546int tipc_bearer_min_mtu(struct net *net, u32 bearer_id)
547{
548 int mtu = TIPC_MIN_BEARER_MTU;
549 struct tipc_bearer *b;
550
551 rcu_read_lock();
552 b = bearer_get(net, bearer_id);
553 if (b)
554 mtu += b->encap_hlen;
555 rcu_read_unlock();
556 return mtu;
557}
558
559/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
560 */
561void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
562 struct sk_buff *skb,
563 struct tipc_media_addr *dest)
564{
565 struct tipc_msg *hdr = buf_msg(skb);
566 struct tipc_bearer *b;
567
568 rcu_read_lock();
569 b = bearer_get(net, bearer_id);
570 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
571#ifdef CONFIG_TIPC_CRYPTO
572 tipc_crypto_xmit(net, &skb, b, dest, NULL);
573 if (skb)
574#endif
575 b->media->send_msg(net, skb, b, dest);
576 } else {
577 kfree_skb(skb);
578 }
579 rcu_read_unlock();
580}
581
582/* tipc_bearer_xmit() -send buffer to destination over bearer
583 */
584void tipc_bearer_xmit(struct net *net, u32 bearer_id,
585 struct sk_buff_head *xmitq,
586 struct tipc_media_addr *dst,
587 struct tipc_node *__dnode)
588{
589 struct tipc_bearer *b;
590 struct sk_buff *skb, *tmp;
591
592 if (skb_queue_empty(xmitq))
593 return;
594
595 rcu_read_lock();
596 b = bearer_get(net, bearer_id);
597 if (unlikely(!b))
598 __skb_queue_purge(xmitq);
599 skb_queue_walk_safe(xmitq, skb, tmp) {
600 __skb_dequeue(xmitq);
601 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
602#ifdef CONFIG_TIPC_CRYPTO
603 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
604 if (skb)
605#endif
606 b->media->send_msg(net, skb, b, dst);
607 } else {
608 kfree_skb(skb);
609 }
610 }
611 rcu_read_unlock();
612}
613
614/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
615 */
616void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
617 struct sk_buff_head *xmitq)
618{
619 struct tipc_net *tn = tipc_net(net);
620 struct tipc_media_addr *dst;
621 int net_id = tn->net_id;
622 struct tipc_bearer *b;
623 struct sk_buff *skb, *tmp;
624 struct tipc_msg *hdr;
625
626 rcu_read_lock();
627 b = bearer_get(net, bearer_id);
628 if (unlikely(!b || !test_bit(0, &b->up)))
629 __skb_queue_purge(xmitq);
630 skb_queue_walk_safe(xmitq, skb, tmp) {
631 hdr = buf_msg(skb);
632 msg_set_non_seq(hdr, 1);
633 msg_set_mc_netid(hdr, net_id);
634 __skb_dequeue(xmitq);
635 dst = &b->bcast_addr;
636#ifdef CONFIG_TIPC_CRYPTO
637 tipc_crypto_xmit(net, &skb, b, dst, NULL);
638 if (skb)
639#endif
640 b->media->send_msg(net, skb, b, dst);
641 }
642 rcu_read_unlock();
643}
644
645/**
646 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
647 * @skb: the received message
648 * @dev: the net device that the packet was received on
649 * @pt: the packet_type structure which was used to register this handler
650 * @orig_dev: the original receive net device in case the device is a bond
651 *
652 * Accept only packets explicitly sent to this node, or broadcast packets;
653 * ignores packets sent using interface multicast, and traffic sent to other
654 * nodes (which can happen if interface is running in promiscuous mode).
655 */
656static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
657 struct packet_type *pt, struct net_device *orig_dev)
658{
659 struct tipc_bearer *b;
660
661 rcu_read_lock();
662 b = rcu_dereference(dev->tipc_ptr) ?:
663 rcu_dereference(orig_dev->tipc_ptr);
664 if (likely(b && test_bit(0, &b->up) &&
665 (skb->pkt_type <= PACKET_MULTICAST))) {
666 skb_mark_not_on_list(skb);
667 TIPC_SKB_CB(skb)->flags = 0;
668 tipc_rcv(dev_net(b->pt.dev), skb, b);
669 rcu_read_unlock();
670 return NET_RX_SUCCESS;
671 }
672 rcu_read_unlock();
673 kfree_skb(skb);
674 return NET_RX_DROP;
675}
676
677/**
678 * tipc_l2_device_event - handle device events from network device
679 * @nb: the context of the notification
680 * @evt: the type of event
681 * @ptr: the net device that the event was on
682 *
683 * This function is called by the Ethernet driver in case of link
684 * change event.
685 */
686static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
687 void *ptr)
688{
689 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
690 struct net *net = dev_net(dev);
691 struct tipc_bearer *b;
692
693 b = rtnl_dereference(dev->tipc_ptr);
694 if (!b)
695 return NOTIFY_DONE;
696
697 trace_tipc_l2_device_event(dev, b, evt);
698 switch (evt) {
699 case NETDEV_CHANGE:
700 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
701 test_and_set_bit_lock(0, &b->up);
702 break;
703 }
704 fallthrough;
705 case NETDEV_GOING_DOWN:
706 clear_bit_unlock(0, &b->up);
707 tipc_reset_bearer(net, b);
708 break;
709 case NETDEV_UP:
710 test_and_set_bit_lock(0, &b->up);
711 break;
712 case NETDEV_CHANGEMTU:
713 if (tipc_mtu_bad(dev)) {
714 bearer_disable(net, b);
715 break;
716 }
717 b->mtu = dev->mtu;
718 tipc_reset_bearer(net, b);
719 break;
720 case NETDEV_CHANGEADDR:
721 b->media->raw2addr(b, &b->addr,
722 (const char *)dev->dev_addr);
723 tipc_reset_bearer(net, b);
724 break;
725 case NETDEV_UNREGISTER:
726 case NETDEV_CHANGENAME:
727 bearer_disable(net, b);
728 break;
729 }
730 return NOTIFY_OK;
731}
732
733static struct notifier_block notifier = {
734 .notifier_call = tipc_l2_device_event,
735 .priority = 0,
736};
737
738int tipc_bearer_setup(void)
739{
740 return register_netdevice_notifier(¬ifier);
741}
742
743void tipc_bearer_cleanup(void)
744{
745 unregister_netdevice_notifier(¬ifier);
746}
747
748void tipc_bearer_stop(struct net *net)
749{
750 struct tipc_net *tn = tipc_net(net);
751 struct tipc_bearer *b;
752 u32 i;
753
754 for (i = 0; i < MAX_BEARERS; i++) {
755 b = rtnl_dereference(tn->bearer_list[i]);
756 if (b) {
757 bearer_disable(net, b);
758 tn->bearer_list[i] = NULL;
759 }
760 }
761}
762
763void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
764{
765 struct net_device *dev = net->loopback_dev;
766 struct sk_buff *skb, *_skb;
767 int exp;
768
769 skb_queue_walk(pkts, _skb) {
770 skb = pskb_copy(_skb, GFP_ATOMIC);
771 if (!skb)
772 continue;
773
774 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
775 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
776 kfree_skb(skb);
777 continue;
778 }
779
780 skb_reset_network_header(skb);
781 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
782 dev->dev_addr, skb->len);
783 skb->dev = dev;
784 skb->pkt_type = PACKET_HOST;
785 skb->ip_summed = CHECKSUM_UNNECESSARY;
786 skb->protocol = eth_type_trans(skb, dev);
787 netif_rx(skb);
788 }
789}
790
791static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
792 struct packet_type *pt, struct net_device *od)
793{
794 consume_skb(skb);
795 return NET_RX_SUCCESS;
796}
797
798int tipc_attach_loopback(struct net *net)
799{
800 struct net_device *dev = net->loopback_dev;
801 struct tipc_net *tn = tipc_net(net);
802
803 if (!dev)
804 return -ENODEV;
805
806 netdev_hold(dev, &tn->loopback_pt.dev_tracker, GFP_KERNEL);
807 tn->loopback_pt.dev = dev;
808 tn->loopback_pt.type = htons(ETH_P_TIPC);
809 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
810 dev_add_pack(&tn->loopback_pt);
811 return 0;
812}
813
814void tipc_detach_loopback(struct net *net)
815{
816 struct tipc_net *tn = tipc_net(net);
817
818 dev_remove_pack(&tn->loopback_pt);
819 netdev_put(net->loopback_dev, &tn->loopback_pt.dev_tracker);
820}
821
822/* Caller should hold rtnl_lock to protect the bearer */
823static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
824 struct tipc_bearer *bearer, int nlflags)
825{
826 void *hdr;
827 struct nlattr *attrs;
828 struct nlattr *prop;
829
830 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
831 nlflags, TIPC_NL_BEARER_GET);
832 if (!hdr)
833 return -EMSGSIZE;
834
835 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
836 if (!attrs)
837 goto msg_full;
838
839 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
840 goto attr_msg_full;
841
842 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
843 if (!prop)
844 goto prop_msg_full;
845 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
846 goto prop_msg_full;
847 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
848 goto prop_msg_full;
849 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
850 goto prop_msg_full;
851 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
852 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
853 goto prop_msg_full;
854
855 nla_nest_end(msg->skb, prop);
856
857#ifdef CONFIG_TIPC_MEDIA_UDP
858 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
859 if (tipc_udp_nl_add_bearer_data(msg, bearer))
860 goto attr_msg_full;
861 }
862#endif
863
864 nla_nest_end(msg->skb, attrs);
865 genlmsg_end(msg->skb, hdr);
866
867 return 0;
868
869prop_msg_full:
870 nla_nest_cancel(msg->skb, prop);
871attr_msg_full:
872 nla_nest_cancel(msg->skb, attrs);
873msg_full:
874 genlmsg_cancel(msg->skb, hdr);
875
876 return -EMSGSIZE;
877}
878
879int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
880{
881 int err;
882 int i = cb->args[0];
883 struct tipc_bearer *bearer;
884 struct tipc_nl_msg msg;
885 struct net *net = sock_net(skb->sk);
886 struct tipc_net *tn = tipc_net(net);
887
888 if (i == MAX_BEARERS)
889 return 0;
890
891 msg.skb = skb;
892 msg.portid = NETLINK_CB(cb->skb).portid;
893 msg.seq = cb->nlh->nlmsg_seq;
894
895 rtnl_lock();
896 for (i = 0; i < MAX_BEARERS; i++) {
897 bearer = rtnl_dereference(tn->bearer_list[i]);
898 if (!bearer)
899 continue;
900
901 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
902 if (err)
903 break;
904 }
905 rtnl_unlock();
906
907 cb->args[0] = i;
908 return skb->len;
909}
910
911int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
912{
913 int err;
914 char *name;
915 struct sk_buff *rep;
916 struct tipc_bearer *bearer;
917 struct tipc_nl_msg msg;
918 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
919 struct net *net = genl_info_net(info);
920
921 if (!info->attrs[TIPC_NLA_BEARER])
922 return -EINVAL;
923
924 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
925 info->attrs[TIPC_NLA_BEARER],
926 tipc_nl_bearer_policy, info->extack);
927 if (err)
928 return err;
929
930 if (!attrs[TIPC_NLA_BEARER_NAME])
931 return -EINVAL;
932 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
933
934 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
935 if (!rep)
936 return -ENOMEM;
937
938 msg.skb = rep;
939 msg.portid = info->snd_portid;
940 msg.seq = info->snd_seq;
941
942 rtnl_lock();
943 bearer = tipc_bearer_find(net, name);
944 if (!bearer) {
945 err = -EINVAL;
946 NL_SET_ERR_MSG(info->extack, "Bearer not found");
947 goto err_out;
948 }
949
950 err = __tipc_nl_add_bearer(&msg, bearer, 0);
951 if (err)
952 goto err_out;
953 rtnl_unlock();
954
955 return genlmsg_reply(rep, info);
956err_out:
957 rtnl_unlock();
958 nlmsg_free(rep);
959
960 return err;
961}
962
963int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
964{
965 int err;
966 char *name;
967 struct tipc_bearer *bearer;
968 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
969 struct net *net = sock_net(skb->sk);
970
971 if (!info->attrs[TIPC_NLA_BEARER])
972 return -EINVAL;
973
974 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
975 info->attrs[TIPC_NLA_BEARER],
976 tipc_nl_bearer_policy, info->extack);
977 if (err)
978 return err;
979
980 if (!attrs[TIPC_NLA_BEARER_NAME])
981 return -EINVAL;
982
983 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
984
985 bearer = tipc_bearer_find(net, name);
986 if (!bearer) {
987 NL_SET_ERR_MSG(info->extack, "Bearer not found");
988 return -EINVAL;
989 }
990
991 bearer_disable(net, bearer);
992
993 return 0;
994}
995
996int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
997{
998 int err;
999
1000 rtnl_lock();
1001 err = __tipc_nl_bearer_disable(skb, info);
1002 rtnl_unlock();
1003
1004 return err;
1005}
1006
1007int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1008{
1009 int err;
1010 char *bearer;
1011 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1012 struct net *net = sock_net(skb->sk);
1013 u32 domain = 0;
1014 u32 prio;
1015
1016 prio = TIPC_MEDIA_LINK_PRI;
1017
1018 if (!info->attrs[TIPC_NLA_BEARER])
1019 return -EINVAL;
1020
1021 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1022 info->attrs[TIPC_NLA_BEARER],
1023 tipc_nl_bearer_policy, info->extack);
1024 if (err)
1025 return err;
1026
1027 if (!attrs[TIPC_NLA_BEARER_NAME])
1028 return -EINVAL;
1029
1030 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1031
1032 if (attrs[TIPC_NLA_BEARER_DOMAIN])
1033 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
1034
1035 if (attrs[TIPC_NLA_BEARER_PROP]) {
1036 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1037
1038 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1039 props);
1040 if (err)
1041 return err;
1042
1043 if (props[TIPC_NLA_PROP_PRIO])
1044 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1045 }
1046
1047 return tipc_enable_bearer(net, bearer, domain, prio, attrs,
1048 info->extack);
1049}
1050
1051int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1052{
1053 int err;
1054
1055 rtnl_lock();
1056 err = __tipc_nl_bearer_enable(skb, info);
1057 rtnl_unlock();
1058
1059 return err;
1060}
1061
1062int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1063{
1064 int err;
1065 char *name;
1066 struct tipc_bearer *b;
1067 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1068 struct net *net = sock_net(skb->sk);
1069
1070 if (!info->attrs[TIPC_NLA_BEARER])
1071 return -EINVAL;
1072
1073 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1074 info->attrs[TIPC_NLA_BEARER],
1075 tipc_nl_bearer_policy, info->extack);
1076 if (err)
1077 return err;
1078
1079 if (!attrs[TIPC_NLA_BEARER_NAME])
1080 return -EINVAL;
1081 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1082
1083 rtnl_lock();
1084 b = tipc_bearer_find(net, name);
1085 if (!b) {
1086 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1087 err = -EINVAL;
1088 goto out;
1089 }
1090
1091#ifdef CONFIG_TIPC_MEDIA_UDP
1092 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1093 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1094 NL_SET_ERR_MSG(info->extack, "UDP option is unsupported");
1095 err = -EINVAL;
1096 goto out;
1097 }
1098
1099 err = tipc_udp_nl_bearer_add(b,
1100 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1101 }
1102#endif
1103out:
1104 rtnl_unlock();
1105
1106 return err;
1107}
1108
1109int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1110{
1111 struct tipc_bearer *b;
1112 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1113 struct net *net = sock_net(skb->sk);
1114 char *name;
1115 int err;
1116
1117 if (!info->attrs[TIPC_NLA_BEARER])
1118 return -EINVAL;
1119
1120 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1121 info->attrs[TIPC_NLA_BEARER],
1122 tipc_nl_bearer_policy, info->extack);
1123 if (err)
1124 return err;
1125
1126 if (!attrs[TIPC_NLA_BEARER_NAME])
1127 return -EINVAL;
1128 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1129
1130 b = tipc_bearer_find(net, name);
1131 if (!b) {
1132 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1133 return -EINVAL;
1134 }
1135
1136 if (attrs[TIPC_NLA_BEARER_PROP]) {
1137 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1138
1139 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1140 props);
1141 if (err)
1142 return err;
1143
1144 if (props[TIPC_NLA_PROP_TOL]) {
1145 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1146 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1147 }
1148 if (props[TIPC_NLA_PROP_PRIO])
1149 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1150 if (props[TIPC_NLA_PROP_WIN])
1151 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1152 if (props[TIPC_NLA_PROP_MTU]) {
1153 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1154 NL_SET_ERR_MSG(info->extack,
1155 "MTU property is unsupported");
1156 return -EINVAL;
1157 }
1158#ifdef CONFIG_TIPC_MEDIA_UDP
1159 if (nla_get_u32(props[TIPC_NLA_PROP_MTU]) <
1160 b->encap_hlen + TIPC_MIN_BEARER_MTU) {
1161 NL_SET_ERR_MSG(info->extack,
1162 "MTU value is out-of-range");
1163 return -EINVAL;
1164 }
1165 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1166 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1167#endif
1168 }
1169 }
1170
1171 return 0;
1172}
1173
1174int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1175{
1176 int err;
1177
1178 rtnl_lock();
1179 err = __tipc_nl_bearer_set(skb, info);
1180 rtnl_unlock();
1181
1182 return err;
1183}
1184
1185static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1186 struct tipc_media *media, int nlflags)
1187{
1188 void *hdr;
1189 struct nlattr *attrs;
1190 struct nlattr *prop;
1191
1192 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1193 nlflags, TIPC_NL_MEDIA_GET);
1194 if (!hdr)
1195 return -EMSGSIZE;
1196
1197 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1198 if (!attrs)
1199 goto msg_full;
1200
1201 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1202 goto attr_msg_full;
1203
1204 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1205 if (!prop)
1206 goto prop_msg_full;
1207 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1208 goto prop_msg_full;
1209 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1210 goto prop_msg_full;
1211 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1212 goto prop_msg_full;
1213 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1214 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1215 goto prop_msg_full;
1216
1217 nla_nest_end(msg->skb, prop);
1218 nla_nest_end(msg->skb, attrs);
1219 genlmsg_end(msg->skb, hdr);
1220
1221 return 0;
1222
1223prop_msg_full:
1224 nla_nest_cancel(msg->skb, prop);
1225attr_msg_full:
1226 nla_nest_cancel(msg->skb, attrs);
1227msg_full:
1228 genlmsg_cancel(msg->skb, hdr);
1229
1230 return -EMSGSIZE;
1231}
1232
1233int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1234{
1235 int err;
1236 int i = cb->args[0];
1237 struct tipc_nl_msg msg;
1238
1239 if (i == MAX_MEDIA)
1240 return 0;
1241
1242 msg.skb = skb;
1243 msg.portid = NETLINK_CB(cb->skb).portid;
1244 msg.seq = cb->nlh->nlmsg_seq;
1245
1246 rtnl_lock();
1247 for (; media_info_array[i] != NULL; i++) {
1248 err = __tipc_nl_add_media(&msg, media_info_array[i],
1249 NLM_F_MULTI);
1250 if (err)
1251 break;
1252 }
1253 rtnl_unlock();
1254
1255 cb->args[0] = i;
1256 return skb->len;
1257}
1258
1259int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1260{
1261 int err;
1262 char *name;
1263 struct tipc_nl_msg msg;
1264 struct tipc_media *media;
1265 struct sk_buff *rep;
1266 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1267
1268 if (!info->attrs[TIPC_NLA_MEDIA])
1269 return -EINVAL;
1270
1271 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1272 info->attrs[TIPC_NLA_MEDIA],
1273 tipc_nl_media_policy, info->extack);
1274 if (err)
1275 return err;
1276
1277 if (!attrs[TIPC_NLA_MEDIA_NAME])
1278 return -EINVAL;
1279 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1280
1281 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1282 if (!rep)
1283 return -ENOMEM;
1284
1285 msg.skb = rep;
1286 msg.portid = info->snd_portid;
1287 msg.seq = info->snd_seq;
1288
1289 rtnl_lock();
1290 media = tipc_media_find(name);
1291 if (!media) {
1292 NL_SET_ERR_MSG(info->extack, "Media not found");
1293 err = -EINVAL;
1294 goto err_out;
1295 }
1296
1297 err = __tipc_nl_add_media(&msg, media, 0);
1298 if (err)
1299 goto err_out;
1300 rtnl_unlock();
1301
1302 return genlmsg_reply(rep, info);
1303err_out:
1304 rtnl_unlock();
1305 nlmsg_free(rep);
1306
1307 return err;
1308}
1309
1310int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1311{
1312 int err;
1313 char *name;
1314 struct tipc_media *m;
1315 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1316
1317 if (!info->attrs[TIPC_NLA_MEDIA])
1318 return -EINVAL;
1319
1320 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1321 info->attrs[TIPC_NLA_MEDIA],
1322 tipc_nl_media_policy, info->extack);
1323
1324 if (!attrs[TIPC_NLA_MEDIA_NAME])
1325 return -EINVAL;
1326 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1327
1328 m = tipc_media_find(name);
1329 if (!m) {
1330 NL_SET_ERR_MSG(info->extack, "Media not found");
1331 return -EINVAL;
1332 }
1333 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1334 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1335
1336 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1337 props);
1338 if (err)
1339 return err;
1340
1341 if (props[TIPC_NLA_PROP_TOL])
1342 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1343 if (props[TIPC_NLA_PROP_PRIO])
1344 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1345 if (props[TIPC_NLA_PROP_WIN])
1346 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1347 if (props[TIPC_NLA_PROP_MTU]) {
1348 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1349 NL_SET_ERR_MSG(info->extack,
1350 "MTU property is unsupported");
1351 return -EINVAL;
1352 }
1353#ifdef CONFIG_TIPC_MEDIA_UDP
1354 if (tipc_udp_mtu_bad(nla_get_u32
1355 (props[TIPC_NLA_PROP_MTU]))) {
1356 NL_SET_ERR_MSG(info->extack,
1357 "MTU value is out-of-range");
1358 return -EINVAL;
1359 }
1360 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1361#endif
1362 }
1363 }
1364
1365 return 0;
1366}
1367
1368int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1369{
1370 int err;
1371
1372 rtnl_lock();
1373 err = __tipc_nl_media_set(skb, info);
1374 rtnl_unlock();
1375
1376 return err;
1377}
1/*
2 * net/tipc/bearer.c: TIPC bearer code
3 *
4 * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5 * Copyright (c) 2004-2006, 2010-2013, 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 <net/sock.h>
38#include "core.h"
39#include "bearer.h"
40#include "link.h"
41#include "discover.h"
42#include "monitor.h"
43#include "bcast.h"
44#include "netlink.h"
45#include "udp_media.h"
46#include "trace.h"
47#include "crypto.h"
48
49#define MAX_ADDR_STR 60
50
51static struct tipc_media * const media_info_array[] = {
52 ð_media_info,
53#ifdef CONFIG_TIPC_MEDIA_IB
54 &ib_media_info,
55#endif
56#ifdef CONFIG_TIPC_MEDIA_UDP
57 &udp_media_info,
58#endif
59 NULL
60};
61
62static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
63{
64 struct tipc_net *tn = tipc_net(net);
65
66 return rcu_dereference(tn->bearer_list[bearer_id]);
67}
68
69static void bearer_disable(struct net *net, struct tipc_bearer *b);
70static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
71 struct packet_type *pt, struct net_device *orig_dev);
72
73/**
74 * tipc_media_find - locates specified media object by name
75 * @name: name to locate
76 */
77struct tipc_media *tipc_media_find(const char *name)
78{
79 u32 i;
80
81 for (i = 0; media_info_array[i] != NULL; i++) {
82 if (!strcmp(media_info_array[i]->name, name))
83 break;
84 }
85 return media_info_array[i];
86}
87
88/**
89 * media_find_id - locates specified media object by type identifier
90 * @type: type identifier to locate
91 */
92static struct tipc_media *media_find_id(u8 type)
93{
94 u32 i;
95
96 for (i = 0; media_info_array[i] != NULL; i++) {
97 if (media_info_array[i]->type_id == type)
98 break;
99 }
100 return media_info_array[i];
101}
102
103/**
104 * tipc_media_addr_printf - record media address in print buffer
105 * @buf: output buffer
106 * @len: output buffer size remaining
107 * @a: input media address
108 */
109int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
110{
111 char addr_str[MAX_ADDR_STR];
112 struct tipc_media *m;
113 int ret;
114
115 m = media_find_id(a->media_id);
116
117 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
118 ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
119 else {
120 u32 i;
121
122 ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
123 for (i = 0; i < sizeof(a->value); i++)
124 ret += scnprintf(buf + ret, len - ret,
125 "-%x", a->value[i]);
126 }
127 return ret;
128}
129
130/**
131 * bearer_name_validate - validate & (optionally) deconstruct bearer name
132 * @name: ptr to bearer name string
133 * @name_parts: ptr to area for bearer name components (or NULL if not needed)
134 *
135 * Return: 1 if bearer name is valid, otherwise 0.
136 */
137static int bearer_name_validate(const char *name,
138 struct tipc_bearer_names *name_parts)
139{
140 char name_copy[TIPC_MAX_BEARER_NAME];
141 char *media_name;
142 char *if_name;
143 u32 media_len;
144 u32 if_len;
145
146 /* copy bearer name & ensure length is OK */
147 if (strscpy(name_copy, name, TIPC_MAX_BEARER_NAME) < 0)
148 return 0;
149
150 /* ensure all component parts of bearer name are present */
151 media_name = name_copy;
152 if_name = strchr(media_name, ':');
153 if (if_name == NULL)
154 return 0;
155 *(if_name++) = 0;
156 media_len = if_name - media_name;
157 if_len = strlen(if_name) + 1;
158
159 /* validate component parts of bearer name */
160 if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
161 (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
162 return 0;
163
164 /* return bearer name components, if necessary */
165 if (name_parts) {
166 strcpy(name_parts->media_name, media_name);
167 strcpy(name_parts->if_name, if_name);
168 }
169 return 1;
170}
171
172/**
173 * tipc_bearer_find - locates bearer object with matching bearer name
174 * @net: the applicable net namespace
175 * @name: bearer name to locate
176 */
177struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
178{
179 struct tipc_net *tn = tipc_net(net);
180 struct tipc_bearer *b;
181 u32 i;
182
183 for (i = 0; i < MAX_BEARERS; i++) {
184 b = rtnl_dereference(tn->bearer_list[i]);
185 if (b && (!strcmp(b->name, name)))
186 return b;
187 }
188 return NULL;
189}
190
191/* tipc_bearer_get_name - get the bearer name from its id.
192 * @net: network namespace
193 * @name: a pointer to the buffer where the name will be stored.
194 * @bearer_id: the id to get the name from.
195 */
196int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
197{
198 struct tipc_net *tn = tipc_net(net);
199 struct tipc_bearer *b;
200
201 if (bearer_id >= MAX_BEARERS)
202 return -EINVAL;
203
204 b = rtnl_dereference(tn->bearer_list[bearer_id]);
205 if (!b)
206 return -EINVAL;
207
208 strcpy(name, b->name);
209 return 0;
210}
211
212void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
213{
214 struct tipc_bearer *b;
215
216 rcu_read_lock();
217 b = bearer_get(net, bearer_id);
218 if (b)
219 tipc_disc_add_dest(b->disc);
220 rcu_read_unlock();
221}
222
223void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
224{
225 struct tipc_bearer *b;
226
227 rcu_read_lock();
228 b = bearer_get(net, bearer_id);
229 if (b)
230 tipc_disc_remove_dest(b->disc);
231 rcu_read_unlock();
232}
233
234/**
235 * tipc_enable_bearer - enable bearer with the given name
236 * @net: the applicable net namespace
237 * @name: bearer name to enable
238 * @disc_domain: bearer domain
239 * @prio: bearer priority
240 * @attr: nlattr array
241 * @extack: netlink extended ack
242 */
243static int tipc_enable_bearer(struct net *net, const char *name,
244 u32 disc_domain, u32 prio,
245 struct nlattr *attr[],
246 struct netlink_ext_ack *extack)
247{
248 struct tipc_net *tn = tipc_net(net);
249 struct tipc_bearer_names b_names;
250 int with_this_prio = 1;
251 struct tipc_bearer *b;
252 struct tipc_media *m;
253 struct sk_buff *skb;
254 int bearer_id = 0;
255 int res = -EINVAL;
256 char *errstr = "";
257 u32 i;
258
259 if (!bearer_name_validate(name, &b_names)) {
260 NL_SET_ERR_MSG(extack, "Illegal name");
261 return res;
262 }
263
264 if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
265 errstr = "illegal priority";
266 NL_SET_ERR_MSG(extack, "Illegal priority");
267 goto rejected;
268 }
269
270 m = tipc_media_find(b_names.media_name);
271 if (!m) {
272 errstr = "media not registered";
273 NL_SET_ERR_MSG(extack, "Media not registered");
274 goto rejected;
275 }
276
277 if (prio == TIPC_MEDIA_LINK_PRI)
278 prio = m->priority;
279
280 /* Check new bearer vs existing ones and find free bearer id if any */
281 bearer_id = MAX_BEARERS;
282 i = MAX_BEARERS;
283 while (i-- != 0) {
284 b = rtnl_dereference(tn->bearer_list[i]);
285 if (!b) {
286 bearer_id = i;
287 continue;
288 }
289 if (!strcmp(name, b->name)) {
290 errstr = "already enabled";
291 NL_SET_ERR_MSG(extack, "Already enabled");
292 goto rejected;
293 }
294
295 if (b->priority == prio &&
296 (++with_this_prio > 2)) {
297 pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
298 name, prio);
299
300 if (prio == TIPC_MIN_LINK_PRI) {
301 errstr = "cannot adjust to lower";
302 NL_SET_ERR_MSG(extack, "Cannot adjust to lower");
303 goto rejected;
304 }
305
306 pr_warn("Bearer <%s>: trying with adjusted priority\n",
307 name);
308 prio--;
309 bearer_id = MAX_BEARERS;
310 i = MAX_BEARERS;
311 with_this_prio = 1;
312 }
313 }
314
315 if (bearer_id >= MAX_BEARERS) {
316 errstr = "max 3 bearers permitted";
317 NL_SET_ERR_MSG(extack, "Max 3 bearers permitted");
318 goto rejected;
319 }
320
321 b = kzalloc(sizeof(*b), GFP_ATOMIC);
322 if (!b)
323 return -ENOMEM;
324
325 strcpy(b->name, name);
326 b->media = m;
327 res = m->enable_media(net, b, attr);
328 if (res) {
329 kfree(b);
330 errstr = "failed to enable media";
331 NL_SET_ERR_MSG(extack, "Failed to enable media");
332 goto rejected;
333 }
334
335 b->identity = bearer_id;
336 b->tolerance = m->tolerance;
337 b->min_win = m->min_win;
338 b->max_win = m->max_win;
339 b->domain = disc_domain;
340 b->net_plane = bearer_id + 'A';
341 b->priority = prio;
342 refcount_set(&b->refcnt, 1);
343
344 res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
345 if (res) {
346 bearer_disable(net, b);
347 errstr = "failed to create discoverer";
348 NL_SET_ERR_MSG(extack, "Failed to create discoverer");
349 goto rejected;
350 }
351
352 /* Create monitoring data before accepting activate messages */
353 if (tipc_mon_create(net, bearer_id)) {
354 bearer_disable(net, b);
355 kfree_skb(skb);
356 return -ENOMEM;
357 }
358
359 test_and_set_bit_lock(0, &b->up);
360 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
361 if (skb)
362 tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
363
364 pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
365
366 return res;
367rejected:
368 pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
369 return res;
370}
371
372/**
373 * tipc_reset_bearer - Reset all links established over this bearer
374 * @net: the applicable net namespace
375 * @b: the target bearer
376 */
377static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
378{
379 pr_info("Resetting bearer <%s>\n", b->name);
380 tipc_node_delete_links(net, b->identity);
381 tipc_disc_reset(net, b);
382 return 0;
383}
384
385bool tipc_bearer_hold(struct tipc_bearer *b)
386{
387 return (b && refcount_inc_not_zero(&b->refcnt));
388}
389
390void tipc_bearer_put(struct tipc_bearer *b)
391{
392 if (b && refcount_dec_and_test(&b->refcnt))
393 kfree_rcu(b, rcu);
394}
395
396/**
397 * bearer_disable - disable this bearer
398 * @net: the applicable net namespace
399 * @b: the bearer to disable
400 *
401 * Note: This routine assumes caller holds RTNL lock.
402 */
403static void bearer_disable(struct net *net, struct tipc_bearer *b)
404{
405 struct tipc_net *tn = tipc_net(net);
406 int bearer_id = b->identity;
407
408 pr_info("Disabling bearer <%s>\n", b->name);
409 clear_bit_unlock(0, &b->up);
410 tipc_node_delete_links(net, bearer_id);
411 b->media->disable_media(b);
412 RCU_INIT_POINTER(b->media_ptr, NULL);
413 if (b->disc)
414 tipc_disc_delete(b->disc);
415 RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
416 tipc_bearer_put(b);
417 tipc_mon_delete(net, bearer_id);
418}
419
420int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
421 struct nlattr *attr[])
422{
423 char *dev_name = strchr((const char *)b->name, ':') + 1;
424 int hwaddr_len = b->media->hwaddr_len;
425 u8 node_id[NODE_ID_LEN] = {0,};
426 struct net_device *dev;
427
428 /* Find device with specified name */
429 dev = dev_get_by_name(net, dev_name);
430 if (!dev)
431 return -ENODEV;
432 if (tipc_mtu_bad(dev)) {
433 dev_put(dev);
434 return -EINVAL;
435 }
436 if (dev == net->loopback_dev) {
437 dev_put(dev);
438 pr_info("Enabling <%s> not permitted\n", b->name);
439 return -EINVAL;
440 }
441
442 /* Autoconfigure own node identity if needed */
443 if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
444 memcpy(node_id, dev->dev_addr, hwaddr_len);
445 tipc_net_init(net, node_id, 0);
446 }
447 if (!tipc_own_id(net)) {
448 dev_put(dev);
449 pr_warn("Failed to obtain node identity\n");
450 return -EINVAL;
451 }
452
453 /* Associate TIPC bearer with L2 bearer */
454 rcu_assign_pointer(b->media_ptr, dev);
455 b->pt.dev = dev;
456 b->pt.type = htons(ETH_P_TIPC);
457 b->pt.func = tipc_l2_rcv_msg;
458 dev_add_pack(&b->pt);
459 memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
460 memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
461 b->bcast_addr.media_id = b->media->type_id;
462 b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
463 b->mtu = dev->mtu;
464 b->media->raw2addr(b, &b->addr, (const char *)dev->dev_addr);
465 rcu_assign_pointer(dev->tipc_ptr, b);
466 return 0;
467}
468
469/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
470 * @b: the target bearer
471 *
472 * Mark L2 bearer as inactive so that incoming buffers are thrown away
473 */
474void tipc_disable_l2_media(struct tipc_bearer *b)
475{
476 struct net_device *dev;
477
478 dev = (struct net_device *)rtnl_dereference(b->media_ptr);
479 dev_remove_pack(&b->pt);
480 RCU_INIT_POINTER(dev->tipc_ptr, NULL);
481 synchronize_net();
482 dev_put(dev);
483}
484
485/**
486 * tipc_l2_send_msg - send a TIPC packet out over an L2 interface
487 * @net: the associated network namespace
488 * @skb: the packet to be sent
489 * @b: the bearer through which the packet is to be sent
490 * @dest: peer destination address
491 */
492int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
493 struct tipc_bearer *b, struct tipc_media_addr *dest)
494{
495 struct net_device *dev;
496 int delta;
497
498 dev = (struct net_device *)rcu_dereference(b->media_ptr);
499 if (!dev)
500 return 0;
501
502 delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
503 if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
504 kfree_skb(skb);
505 return 0;
506 }
507 skb_reset_network_header(skb);
508 skb->dev = dev;
509 skb->protocol = htons(ETH_P_TIPC);
510 dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
511 dev->dev_addr, skb->len);
512 dev_queue_xmit(skb);
513 return 0;
514}
515
516bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
517{
518 bool supp = false;
519 struct tipc_bearer *b;
520
521 rcu_read_lock();
522 b = bearer_get(net, bearer_id);
523 if (b)
524 supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
525 rcu_read_unlock();
526 return supp;
527}
528
529int tipc_bearer_mtu(struct net *net, u32 bearer_id)
530{
531 int mtu = 0;
532 struct tipc_bearer *b;
533
534 rcu_read_lock();
535 b = bearer_get(net, bearer_id);
536 if (b)
537 mtu = b->mtu;
538 rcu_read_unlock();
539 return mtu;
540}
541
542int tipc_bearer_min_mtu(struct net *net, u32 bearer_id)
543{
544 int mtu = TIPC_MIN_BEARER_MTU;
545 struct tipc_bearer *b;
546
547 rcu_read_lock();
548 b = bearer_get(net, bearer_id);
549 if (b)
550 mtu += b->encap_hlen;
551 rcu_read_unlock();
552 return mtu;
553}
554
555/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
556 */
557void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
558 struct sk_buff *skb,
559 struct tipc_media_addr *dest)
560{
561 struct tipc_msg *hdr = buf_msg(skb);
562 struct tipc_bearer *b;
563
564 rcu_read_lock();
565 b = bearer_get(net, bearer_id);
566 if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
567#ifdef CONFIG_TIPC_CRYPTO
568 tipc_crypto_xmit(net, &skb, b, dest, NULL);
569 if (skb)
570#endif
571 b->media->send_msg(net, skb, b, dest);
572 } else {
573 kfree_skb(skb);
574 }
575 rcu_read_unlock();
576}
577
578/* tipc_bearer_xmit() -send buffer to destination over bearer
579 */
580void tipc_bearer_xmit(struct net *net, u32 bearer_id,
581 struct sk_buff_head *xmitq,
582 struct tipc_media_addr *dst,
583 struct tipc_node *__dnode)
584{
585 struct tipc_bearer *b;
586 struct sk_buff *skb, *tmp;
587
588 if (skb_queue_empty(xmitq))
589 return;
590
591 rcu_read_lock();
592 b = bearer_get(net, bearer_id);
593 if (unlikely(!b))
594 __skb_queue_purge(xmitq);
595 skb_queue_walk_safe(xmitq, skb, tmp) {
596 __skb_dequeue(xmitq);
597 if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
598#ifdef CONFIG_TIPC_CRYPTO
599 tipc_crypto_xmit(net, &skb, b, dst, __dnode);
600 if (skb)
601#endif
602 b->media->send_msg(net, skb, b, dst);
603 } else {
604 kfree_skb(skb);
605 }
606 }
607 rcu_read_unlock();
608}
609
610/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
611 */
612void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
613 struct sk_buff_head *xmitq)
614{
615 struct tipc_net *tn = tipc_net(net);
616 struct tipc_media_addr *dst;
617 int net_id = tn->net_id;
618 struct tipc_bearer *b;
619 struct sk_buff *skb, *tmp;
620 struct tipc_msg *hdr;
621
622 rcu_read_lock();
623 b = bearer_get(net, bearer_id);
624 if (unlikely(!b || !test_bit(0, &b->up)))
625 __skb_queue_purge(xmitq);
626 skb_queue_walk_safe(xmitq, skb, tmp) {
627 hdr = buf_msg(skb);
628 msg_set_non_seq(hdr, 1);
629 msg_set_mc_netid(hdr, net_id);
630 __skb_dequeue(xmitq);
631 dst = &b->bcast_addr;
632#ifdef CONFIG_TIPC_CRYPTO
633 tipc_crypto_xmit(net, &skb, b, dst, NULL);
634 if (skb)
635#endif
636 b->media->send_msg(net, skb, b, dst);
637 }
638 rcu_read_unlock();
639}
640
641/**
642 * tipc_l2_rcv_msg - handle incoming TIPC message from an interface
643 * @skb: the received message
644 * @dev: the net device that the packet was received on
645 * @pt: the packet_type structure which was used to register this handler
646 * @orig_dev: the original receive net device in case the device is a bond
647 *
648 * Accept only packets explicitly sent to this node, or broadcast packets;
649 * ignores packets sent using interface multicast, and traffic sent to other
650 * nodes (which can happen if interface is running in promiscuous mode).
651 */
652static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
653 struct packet_type *pt, struct net_device *orig_dev)
654{
655 struct tipc_bearer *b;
656
657 rcu_read_lock();
658 b = rcu_dereference(dev->tipc_ptr) ?:
659 rcu_dereference(orig_dev->tipc_ptr);
660 if (likely(b && test_bit(0, &b->up) &&
661 (skb->pkt_type <= PACKET_MULTICAST))) {
662 skb_mark_not_on_list(skb);
663 TIPC_SKB_CB(skb)->flags = 0;
664 tipc_rcv(dev_net(b->pt.dev), skb, b);
665 rcu_read_unlock();
666 return NET_RX_SUCCESS;
667 }
668 rcu_read_unlock();
669 kfree_skb(skb);
670 return NET_RX_DROP;
671}
672
673/**
674 * tipc_l2_device_event - handle device events from network device
675 * @nb: the context of the notification
676 * @evt: the type of event
677 * @ptr: the net device that the event was on
678 *
679 * This function is called by the Ethernet driver in case of link
680 * change event.
681 */
682static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
683 void *ptr)
684{
685 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
686 struct net *net = dev_net(dev);
687 struct tipc_bearer *b;
688
689 b = rtnl_dereference(dev->tipc_ptr);
690 if (!b)
691 return NOTIFY_DONE;
692
693 trace_tipc_l2_device_event(dev, b, evt);
694 switch (evt) {
695 case NETDEV_CHANGE:
696 if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
697 test_and_set_bit_lock(0, &b->up);
698 break;
699 }
700 fallthrough;
701 case NETDEV_GOING_DOWN:
702 clear_bit_unlock(0, &b->up);
703 tipc_reset_bearer(net, b);
704 break;
705 case NETDEV_UP:
706 test_and_set_bit_lock(0, &b->up);
707 break;
708 case NETDEV_CHANGEMTU:
709 if (tipc_mtu_bad(dev)) {
710 bearer_disable(net, b);
711 break;
712 }
713 b->mtu = dev->mtu;
714 tipc_reset_bearer(net, b);
715 break;
716 case NETDEV_CHANGEADDR:
717 b->media->raw2addr(b, &b->addr,
718 (const char *)dev->dev_addr);
719 tipc_reset_bearer(net, b);
720 break;
721 case NETDEV_UNREGISTER:
722 case NETDEV_CHANGENAME:
723 bearer_disable(net, b);
724 break;
725 }
726 return NOTIFY_OK;
727}
728
729static struct notifier_block notifier = {
730 .notifier_call = tipc_l2_device_event,
731 .priority = 0,
732};
733
734int tipc_bearer_setup(void)
735{
736 return register_netdevice_notifier(¬ifier);
737}
738
739void tipc_bearer_cleanup(void)
740{
741 unregister_netdevice_notifier(¬ifier);
742}
743
744void tipc_bearer_stop(struct net *net)
745{
746 struct tipc_net *tn = tipc_net(net);
747 struct tipc_bearer *b;
748 u32 i;
749
750 for (i = 0; i < MAX_BEARERS; i++) {
751 b = rtnl_dereference(tn->bearer_list[i]);
752 if (b) {
753 bearer_disable(net, b);
754 tn->bearer_list[i] = NULL;
755 }
756 }
757}
758
759void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
760{
761 struct net_device *dev = net->loopback_dev;
762 struct sk_buff *skb, *_skb;
763 int exp;
764
765 skb_queue_walk(pkts, _skb) {
766 skb = pskb_copy(_skb, GFP_ATOMIC);
767 if (!skb)
768 continue;
769
770 exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
771 if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
772 kfree_skb(skb);
773 continue;
774 }
775
776 skb_reset_network_header(skb);
777 dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
778 dev->dev_addr, skb->len);
779 skb->dev = dev;
780 skb->pkt_type = PACKET_HOST;
781 skb->ip_summed = CHECKSUM_UNNECESSARY;
782 skb->protocol = eth_type_trans(skb, dev);
783 netif_rx(skb);
784 }
785}
786
787static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
788 struct packet_type *pt, struct net_device *od)
789{
790 consume_skb(skb);
791 return NET_RX_SUCCESS;
792}
793
794int tipc_attach_loopback(struct net *net)
795{
796 struct net_device *dev = net->loopback_dev;
797 struct tipc_net *tn = tipc_net(net);
798
799 if (!dev)
800 return -ENODEV;
801
802 netdev_hold(dev, &tn->loopback_pt.dev_tracker, GFP_KERNEL);
803 tn->loopback_pt.dev = dev;
804 tn->loopback_pt.type = htons(ETH_P_TIPC);
805 tn->loopback_pt.func = tipc_loopback_rcv_pkt;
806 dev_add_pack(&tn->loopback_pt);
807 return 0;
808}
809
810void tipc_detach_loopback(struct net *net)
811{
812 struct tipc_net *tn = tipc_net(net);
813
814 dev_remove_pack(&tn->loopback_pt);
815 netdev_put(net->loopback_dev, &tn->loopback_pt.dev_tracker);
816}
817
818/* Caller should hold rtnl_lock to protect the bearer */
819static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
820 struct tipc_bearer *bearer, int nlflags)
821{
822 void *hdr;
823 struct nlattr *attrs;
824 struct nlattr *prop;
825
826 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
827 nlflags, TIPC_NL_BEARER_GET);
828 if (!hdr)
829 return -EMSGSIZE;
830
831 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
832 if (!attrs)
833 goto msg_full;
834
835 if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
836 goto attr_msg_full;
837
838 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
839 if (!prop)
840 goto prop_msg_full;
841 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
842 goto prop_msg_full;
843 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
844 goto prop_msg_full;
845 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
846 goto prop_msg_full;
847 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
848 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
849 goto prop_msg_full;
850
851 nla_nest_end(msg->skb, prop);
852
853#ifdef CONFIG_TIPC_MEDIA_UDP
854 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
855 if (tipc_udp_nl_add_bearer_data(msg, bearer))
856 goto attr_msg_full;
857 }
858#endif
859
860 nla_nest_end(msg->skb, attrs);
861 genlmsg_end(msg->skb, hdr);
862
863 return 0;
864
865prop_msg_full:
866 nla_nest_cancel(msg->skb, prop);
867attr_msg_full:
868 nla_nest_cancel(msg->skb, attrs);
869msg_full:
870 genlmsg_cancel(msg->skb, hdr);
871
872 return -EMSGSIZE;
873}
874
875int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
876{
877 int err;
878 int i = cb->args[0];
879 struct tipc_bearer *bearer;
880 struct tipc_nl_msg msg;
881 struct net *net = sock_net(skb->sk);
882 struct tipc_net *tn = tipc_net(net);
883
884 if (i == MAX_BEARERS)
885 return 0;
886
887 msg.skb = skb;
888 msg.portid = NETLINK_CB(cb->skb).portid;
889 msg.seq = cb->nlh->nlmsg_seq;
890
891 rtnl_lock();
892 for (i = 0; i < MAX_BEARERS; i++) {
893 bearer = rtnl_dereference(tn->bearer_list[i]);
894 if (!bearer)
895 continue;
896
897 err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
898 if (err)
899 break;
900 }
901 rtnl_unlock();
902
903 cb->args[0] = i;
904 return skb->len;
905}
906
907int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
908{
909 int err;
910 char *name;
911 struct sk_buff *rep;
912 struct tipc_bearer *bearer;
913 struct tipc_nl_msg msg;
914 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
915 struct net *net = genl_info_net(info);
916
917 if (!info->attrs[TIPC_NLA_BEARER])
918 return -EINVAL;
919
920 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
921 info->attrs[TIPC_NLA_BEARER],
922 tipc_nl_bearer_policy, info->extack);
923 if (err)
924 return err;
925
926 if (!attrs[TIPC_NLA_BEARER_NAME])
927 return -EINVAL;
928 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
929
930 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
931 if (!rep)
932 return -ENOMEM;
933
934 msg.skb = rep;
935 msg.portid = info->snd_portid;
936 msg.seq = info->snd_seq;
937
938 rtnl_lock();
939 bearer = tipc_bearer_find(net, name);
940 if (!bearer) {
941 err = -EINVAL;
942 NL_SET_ERR_MSG(info->extack, "Bearer not found");
943 goto err_out;
944 }
945
946 err = __tipc_nl_add_bearer(&msg, bearer, 0);
947 if (err)
948 goto err_out;
949 rtnl_unlock();
950
951 return genlmsg_reply(rep, info);
952err_out:
953 rtnl_unlock();
954 nlmsg_free(rep);
955
956 return err;
957}
958
959int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
960{
961 int err;
962 char *name;
963 struct tipc_bearer *bearer;
964 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
965 struct net *net = sock_net(skb->sk);
966
967 if (!info->attrs[TIPC_NLA_BEARER])
968 return -EINVAL;
969
970 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
971 info->attrs[TIPC_NLA_BEARER],
972 tipc_nl_bearer_policy, info->extack);
973 if (err)
974 return err;
975
976 if (!attrs[TIPC_NLA_BEARER_NAME])
977 return -EINVAL;
978
979 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
980
981 bearer = tipc_bearer_find(net, name);
982 if (!bearer) {
983 NL_SET_ERR_MSG(info->extack, "Bearer not found");
984 return -EINVAL;
985 }
986
987 bearer_disable(net, bearer);
988
989 return 0;
990}
991
992int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
993{
994 int err;
995
996 rtnl_lock();
997 err = __tipc_nl_bearer_disable(skb, info);
998 rtnl_unlock();
999
1000 return err;
1001}
1002
1003int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1004{
1005 int err;
1006 char *bearer;
1007 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1008 struct net *net = sock_net(skb->sk);
1009 u32 domain = 0;
1010 u32 prio;
1011
1012 prio = TIPC_MEDIA_LINK_PRI;
1013
1014 if (!info->attrs[TIPC_NLA_BEARER])
1015 return -EINVAL;
1016
1017 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1018 info->attrs[TIPC_NLA_BEARER],
1019 tipc_nl_bearer_policy, info->extack);
1020 if (err)
1021 return err;
1022
1023 if (!attrs[TIPC_NLA_BEARER_NAME])
1024 return -EINVAL;
1025
1026 bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1027
1028 if (attrs[TIPC_NLA_BEARER_DOMAIN])
1029 domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
1030
1031 if (attrs[TIPC_NLA_BEARER_PROP]) {
1032 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1033
1034 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1035 props);
1036 if (err)
1037 return err;
1038
1039 if (props[TIPC_NLA_PROP_PRIO])
1040 prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1041 }
1042
1043 return tipc_enable_bearer(net, bearer, domain, prio, attrs,
1044 info->extack);
1045}
1046
1047int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
1048{
1049 int err;
1050
1051 rtnl_lock();
1052 err = __tipc_nl_bearer_enable(skb, info);
1053 rtnl_unlock();
1054
1055 return err;
1056}
1057
1058int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
1059{
1060 int err;
1061 char *name;
1062 struct tipc_bearer *b;
1063 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1064 struct net *net = sock_net(skb->sk);
1065
1066 if (!info->attrs[TIPC_NLA_BEARER])
1067 return -EINVAL;
1068
1069 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1070 info->attrs[TIPC_NLA_BEARER],
1071 tipc_nl_bearer_policy, info->extack);
1072 if (err)
1073 return err;
1074
1075 if (!attrs[TIPC_NLA_BEARER_NAME])
1076 return -EINVAL;
1077 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1078
1079 rtnl_lock();
1080 b = tipc_bearer_find(net, name);
1081 if (!b) {
1082 rtnl_unlock();
1083 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1084 return -EINVAL;
1085 }
1086
1087#ifdef CONFIG_TIPC_MEDIA_UDP
1088 if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
1089 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1090 rtnl_unlock();
1091 NL_SET_ERR_MSG(info->extack, "UDP option is unsupported");
1092 return -EINVAL;
1093 }
1094
1095 err = tipc_udp_nl_bearer_add(b,
1096 attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1097 if (err) {
1098 rtnl_unlock();
1099 return err;
1100 }
1101 }
1102#endif
1103 rtnl_unlock();
1104
1105 return 0;
1106}
1107
1108int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1109{
1110 struct tipc_bearer *b;
1111 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1112 struct net *net = sock_net(skb->sk);
1113 char *name;
1114 int err;
1115
1116 if (!info->attrs[TIPC_NLA_BEARER])
1117 return -EINVAL;
1118
1119 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
1120 info->attrs[TIPC_NLA_BEARER],
1121 tipc_nl_bearer_policy, info->extack);
1122 if (err)
1123 return err;
1124
1125 if (!attrs[TIPC_NLA_BEARER_NAME])
1126 return -EINVAL;
1127 name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
1128
1129 b = tipc_bearer_find(net, name);
1130 if (!b) {
1131 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1132 return -EINVAL;
1133 }
1134
1135 if (attrs[TIPC_NLA_BEARER_PROP]) {
1136 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1137
1138 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
1139 props);
1140 if (err)
1141 return err;
1142
1143 if (props[TIPC_NLA_PROP_TOL]) {
1144 b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1145 tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
1146 }
1147 if (props[TIPC_NLA_PROP_PRIO])
1148 b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1149 if (props[TIPC_NLA_PROP_WIN])
1150 b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1151 if (props[TIPC_NLA_PROP_MTU]) {
1152 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1153 NL_SET_ERR_MSG(info->extack,
1154 "MTU property is unsupported");
1155 return -EINVAL;
1156 }
1157#ifdef CONFIG_TIPC_MEDIA_UDP
1158 if (nla_get_u32(props[TIPC_NLA_PROP_MTU]) <
1159 b->encap_hlen + TIPC_MIN_BEARER_MTU) {
1160 NL_SET_ERR_MSG(info->extack,
1161 "MTU value is out-of-range");
1162 return -EINVAL;
1163 }
1164 b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1165 tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
1166#endif
1167 }
1168 }
1169
1170 return 0;
1171}
1172
1173int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1174{
1175 int err;
1176
1177 rtnl_lock();
1178 err = __tipc_nl_bearer_set(skb, info);
1179 rtnl_unlock();
1180
1181 return err;
1182}
1183
1184static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1185 struct tipc_media *media, int nlflags)
1186{
1187 void *hdr;
1188 struct nlattr *attrs;
1189 struct nlattr *prop;
1190
1191 hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
1192 nlflags, TIPC_NL_MEDIA_GET);
1193 if (!hdr)
1194 return -EMSGSIZE;
1195
1196 attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
1197 if (!attrs)
1198 goto msg_full;
1199
1200 if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
1201 goto attr_msg_full;
1202
1203 prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
1204 if (!prop)
1205 goto prop_msg_full;
1206 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
1207 goto prop_msg_full;
1208 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
1209 goto prop_msg_full;
1210 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
1211 goto prop_msg_full;
1212 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1213 if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
1214 goto prop_msg_full;
1215
1216 nla_nest_end(msg->skb, prop);
1217 nla_nest_end(msg->skb, attrs);
1218 genlmsg_end(msg->skb, hdr);
1219
1220 return 0;
1221
1222prop_msg_full:
1223 nla_nest_cancel(msg->skb, prop);
1224attr_msg_full:
1225 nla_nest_cancel(msg->skb, attrs);
1226msg_full:
1227 genlmsg_cancel(msg->skb, hdr);
1228
1229 return -EMSGSIZE;
1230}
1231
1232int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1233{
1234 int err;
1235 int i = cb->args[0];
1236 struct tipc_nl_msg msg;
1237
1238 if (i == MAX_MEDIA)
1239 return 0;
1240
1241 msg.skb = skb;
1242 msg.portid = NETLINK_CB(cb->skb).portid;
1243 msg.seq = cb->nlh->nlmsg_seq;
1244
1245 rtnl_lock();
1246 for (; media_info_array[i] != NULL; i++) {
1247 err = __tipc_nl_add_media(&msg, media_info_array[i],
1248 NLM_F_MULTI);
1249 if (err)
1250 break;
1251 }
1252 rtnl_unlock();
1253
1254 cb->args[0] = i;
1255 return skb->len;
1256}
1257
1258int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1259{
1260 int err;
1261 char *name;
1262 struct tipc_nl_msg msg;
1263 struct tipc_media *media;
1264 struct sk_buff *rep;
1265 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1266
1267 if (!info->attrs[TIPC_NLA_MEDIA])
1268 return -EINVAL;
1269
1270 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1271 info->attrs[TIPC_NLA_MEDIA],
1272 tipc_nl_media_policy, info->extack);
1273 if (err)
1274 return err;
1275
1276 if (!attrs[TIPC_NLA_MEDIA_NAME])
1277 return -EINVAL;
1278 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1279
1280 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1281 if (!rep)
1282 return -ENOMEM;
1283
1284 msg.skb = rep;
1285 msg.portid = info->snd_portid;
1286 msg.seq = info->snd_seq;
1287
1288 rtnl_lock();
1289 media = tipc_media_find(name);
1290 if (!media) {
1291 NL_SET_ERR_MSG(info->extack, "Media not found");
1292 err = -EINVAL;
1293 goto err_out;
1294 }
1295
1296 err = __tipc_nl_add_media(&msg, media, 0);
1297 if (err)
1298 goto err_out;
1299 rtnl_unlock();
1300
1301 return genlmsg_reply(rep, info);
1302err_out:
1303 rtnl_unlock();
1304 nlmsg_free(rep);
1305
1306 return err;
1307}
1308
1309int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1310{
1311 int err;
1312 char *name;
1313 struct tipc_media *m;
1314 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1315
1316 if (!info->attrs[TIPC_NLA_MEDIA])
1317 return -EINVAL;
1318
1319 err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
1320 info->attrs[TIPC_NLA_MEDIA],
1321 tipc_nl_media_policy, info->extack);
1322
1323 if (!attrs[TIPC_NLA_MEDIA_NAME])
1324 return -EINVAL;
1325 name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
1326
1327 m = tipc_media_find(name);
1328 if (!m) {
1329 NL_SET_ERR_MSG(info->extack, "Media not found");
1330 return -EINVAL;
1331 }
1332 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1333 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1334
1335 err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
1336 props);
1337 if (err)
1338 return err;
1339
1340 if (props[TIPC_NLA_PROP_TOL])
1341 m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
1342 if (props[TIPC_NLA_PROP_PRIO])
1343 m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
1344 if (props[TIPC_NLA_PROP_WIN])
1345 m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
1346 if (props[TIPC_NLA_PROP_MTU]) {
1347 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1348 NL_SET_ERR_MSG(info->extack,
1349 "MTU property is unsupported");
1350 return -EINVAL;
1351 }
1352#ifdef CONFIG_TIPC_MEDIA_UDP
1353 if (tipc_udp_mtu_bad(nla_get_u32
1354 (props[TIPC_NLA_PROP_MTU]))) {
1355 NL_SET_ERR_MSG(info->extack,
1356 "MTU value is out-of-range");
1357 return -EINVAL;
1358 }
1359 m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
1360#endif
1361 }
1362 }
1363
1364 return 0;
1365}
1366
1367int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1368{
1369 int err;
1370
1371 rtnl_lock();
1372 err = __tipc_nl_media_set(skb, info);
1373 rtnl_unlock();
1374
1375 return err;
1376}