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 &eth_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(type: a->media_id);
116
117 if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
118 ret = scnprintf(buf, size: len, fmt: "%s(%s)", m->name, addr_str);
119 else {
120 u32 i;
121
122 ret = scnprintf(buf, size: len, fmt: "UNKNOWN(%u)", a->media_id);
123 for (i = 0; i < sizeof(a->value); i++)
124 ret += scnprintf(buf: buf + ret, size: len - ret,
125 fmt: "-%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(p: name_parts->media_name, q: media_name);
167 strcpy(p: name_parts->if_name, q: 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(p: name, q: 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(req: 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(req: 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, name_parts: &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(name: 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(size: sizeof(*b), GFP_ATOMIC);
322 if (!b)
323 return -ENOMEM;
324
325 strcpy(p: b->name, q: name);
326 b->media = m;
327 res = m->enable_media(net, b, attr);
328 if (res) {
329 kfree(objp: 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(r: &b->refcnt, n: 1);
343
344 res = tipc_disc_create(net, b_ptr: b, dest: &b->bcast_addr, skb: &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(nr: 0, addr: &b->up);
360 rcu_assign_pointer(tn->bearer_list[bearer_id], b);
361 if (skb)
362 tipc_bearer_xmit_skb(net, bearer_id, skb, dest: &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, bearer_id: b->identity);
381 tipc_disc_reset(net, b_ptr: b);
382 return 0;
383}
384
385bool tipc_bearer_hold(struct tipc_bearer *b)
386{
387 return (b && refcount_inc_not_zero(r: &b->refcnt));
388}
389
390void tipc_bearer_put(struct tipc_bearer *b)
391{
392 if (b && refcount_dec_and_test(r: &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(nr: 0, addr: &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(req: 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, name: 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, addr: 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(pt: &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(pt: &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, nhead: delta, ntail: 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, daddr: dest->value,
511 saddr: dev->dev_addr, len: 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: &skb, b, dst: 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(list: xmitq))
589 return;
590
591 rcu_read_lock();
592 b = bearer_get(net, bearer_id);
593 if (unlikely(!b))
594 __skb_queue_purge(list: xmitq);
595 skb_queue_walk_safe(xmitq, skb, tmp) {
596 __skb_dequeue(list: 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: &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(list: xmitq);
626 skb_queue_walk_safe(xmitq, skb, tmp) {
627 hdr = buf_msg(skb);
628 msg_set_non_seq(m: hdr, n: 1);
629 msg_set_mc_netid(m: hdr, p: net_id);
630 __skb_dequeue(list: xmitq);
631 dst = &b->bcast_addr;
632#ifdef CONFIG_TIPC_CRYPTO
633 tipc_crypto_xmit(net, skb: &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(net: dev_net(dev: 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(info: 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(nr: 0, addr: &b->up);
698 break;
699 }
700 fallthrough;
701 case NETDEV_GOING_DOWN:
702 clear_bit_unlock(nr: 0, addr: &b->up);
703 tipc_reset_bearer(net, b);
704 break;
705 case NETDEV_UP:
706 test_and_set_bit_lock(nr: 0, addr: &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(nb: &notifier);
737}
738
739void tipc_bearer_cleanup(void)
740{
741 unregister_netdevice_notifier(nb: &notifier);
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: _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, nhead: exp, ntail: 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, daddr: dev->dev_addr,
778 saddr: dev->dev_addr, len: 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, tracker: &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(pt: &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(pt: &tn->loopback_pt);
815 netdev_put(dev: net->loopback_dev, tracker: &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(skb: msg->skb, portid: msg->portid, seq: msg->seq, family: &tipc_genl_family,
827 flags: nlflags, cmd: TIPC_NL_BEARER_GET);
828 if (!hdr)
829 return -EMSGSIZE;
830
831 attrs = nla_nest_start_noflag(skb: msg->skb, attrtype: TIPC_NLA_BEARER);
832 if (!attrs)
833 goto msg_full;
834
835 if (nla_put_string(skb: msg->skb, attrtype: TIPC_NLA_BEARER_NAME, str: bearer->name))
836 goto attr_msg_full;
837
838 prop = nla_nest_start_noflag(skb: msg->skb, attrtype: TIPC_NLA_BEARER_PROP);
839 if (!prop)
840 goto prop_msg_full;
841 if (nla_put_u32(skb: msg->skb, attrtype: TIPC_NLA_PROP_PRIO, value: bearer->priority))
842 goto prop_msg_full;
843 if (nla_put_u32(skb: msg->skb, attrtype: TIPC_NLA_PROP_TOL, value: bearer->tolerance))
844 goto prop_msg_full;
845 if (nla_put_u32(skb: msg->skb, attrtype: TIPC_NLA_PROP_WIN, value: bearer->max_win))
846 goto prop_msg_full;
847 if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
848 if (nla_put_u32(skb: msg->skb, attrtype: TIPC_NLA_PROP_MTU, value: bearer->mtu))
849 goto prop_msg_full;
850
851 nla_nest_end(skb: msg->skb, start: 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, b: bearer))
856 goto attr_msg_full;
857 }
858#endif
859
860 nla_nest_end(skb: msg->skb, start: attrs);
861 genlmsg_end(skb: msg->skb, hdr);
862
863 return 0;
864
865prop_msg_full:
866 nla_nest_cancel(skb: msg->skb, start: prop);
867attr_msg_full:
868 nla_nest_cancel(skb: msg->skb, start: attrs);
869msg_full:
870 genlmsg_cancel(skb: 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(sk: 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: &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(tb: attrs, maxtype: TIPC_NLA_BEARER_MAX,
921 nla: info->attrs[TIPC_NLA_BEARER],
922 policy: tipc_nl_bearer_policy, extack: info->extack);
923 if (err)
924 return err;
925
926 if (!attrs[TIPC_NLA_BEARER_NAME])
927 return -EINVAL;
928 name = nla_data(nla: 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: &msg, bearer, nlflags: 0);
947 if (err)
948 goto err_out;
949 rtnl_unlock();
950
951 return genlmsg_reply(skb: rep, info);
952err_out:
953 rtnl_unlock();
954 nlmsg_free(skb: 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(sk: skb->sk);
966
967 if (!info->attrs[TIPC_NLA_BEARER])
968 return -EINVAL;
969
970 err = nla_parse_nested_deprecated(tb: attrs, maxtype: TIPC_NLA_BEARER_MAX,
971 nla: info->attrs[TIPC_NLA_BEARER],
972 policy: tipc_nl_bearer_policy, extack: info->extack);
973 if (err)
974 return err;
975
976 if (!attrs[TIPC_NLA_BEARER_NAME])
977 return -EINVAL;
978
979 name = nla_data(nla: 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, b: 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(sk: 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(tb: attrs, maxtype: TIPC_NLA_BEARER_MAX,
1018 nla: info->attrs[TIPC_NLA_BEARER],
1019 policy: tipc_nl_bearer_policy, extack: info->extack);
1020 if (err)
1021 return err;
1022
1023 if (!attrs[TIPC_NLA_BEARER_NAME])
1024 return -EINVAL;
1025
1026 bearer = nla_data(nla: attrs[TIPC_NLA_BEARER_NAME]);
1027
1028 if (attrs[TIPC_NLA_BEARER_DOMAIN])
1029 domain = nla_get_u32(nla: 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(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(nla: props[TIPC_NLA_PROP_PRIO]);
1041 }
1042
1043 return tipc_enable_bearer(net, name: bearer, disc_domain: domain, prio, attr: attrs,
1044 extack: 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(sk: skb->sk);
1065
1066 if (!info->attrs[TIPC_NLA_BEARER])
1067 return -EINVAL;
1068
1069 err = nla_parse_nested_deprecated(tb: attrs, maxtype: TIPC_NLA_BEARER_MAX,
1070 nla: info->attrs[TIPC_NLA_BEARER],
1071 policy: tipc_nl_bearer_policy, extack: info->extack);
1072 if (err)
1073 return err;
1074
1075 if (!attrs[TIPC_NLA_BEARER_NAME])
1076 return -EINVAL;
1077 name = nla_data(nla: attrs[TIPC_NLA_BEARER_NAME]);
1078
1079 rtnl_lock();
1080 b = tipc_bearer_find(net, name);
1081 if (!b) {
1082 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1083 err = -EINVAL;
1084 goto out;
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 NL_SET_ERR_MSG(info->extack, "UDP option is unsupported");
1091 err = -EINVAL;
1092 goto out;
1093 }
1094
1095 err = tipc_udp_nl_bearer_add(b,
1096 attr: attrs[TIPC_NLA_BEARER_UDP_OPTS]);
1097 }
1098#endif
1099out:
1100 rtnl_unlock();
1101
1102 return err;
1103}
1104
1105int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1106{
1107 struct tipc_bearer *b;
1108 struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
1109 struct net *net = sock_net(sk: skb->sk);
1110 char *name;
1111 int err;
1112
1113 if (!info->attrs[TIPC_NLA_BEARER])
1114 return -EINVAL;
1115
1116 err = nla_parse_nested_deprecated(tb: attrs, maxtype: TIPC_NLA_BEARER_MAX,
1117 nla: info->attrs[TIPC_NLA_BEARER],
1118 policy: tipc_nl_bearer_policy, extack: info->extack);
1119 if (err)
1120 return err;
1121
1122 if (!attrs[TIPC_NLA_BEARER_NAME])
1123 return -EINVAL;
1124 name = nla_data(nla: attrs[TIPC_NLA_BEARER_NAME]);
1125
1126 b = tipc_bearer_find(net, name);
1127 if (!b) {
1128 NL_SET_ERR_MSG(info->extack, "Bearer not found");
1129 return -EINVAL;
1130 }
1131
1132 if (attrs[TIPC_NLA_BEARER_PROP]) {
1133 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1134
1135 err = tipc_nl_parse_link_prop(prop: attrs[TIPC_NLA_BEARER_PROP],
1136 props);
1137 if (err)
1138 return err;
1139
1140 if (props[TIPC_NLA_PROP_TOL]) {
1141 b->tolerance = nla_get_u32(nla: props[TIPC_NLA_PROP_TOL]);
1142 tipc_node_apply_property(net, b, prop: TIPC_NLA_PROP_TOL);
1143 }
1144 if (props[TIPC_NLA_PROP_PRIO])
1145 b->priority = nla_get_u32(nla: props[TIPC_NLA_PROP_PRIO]);
1146 if (props[TIPC_NLA_PROP_WIN])
1147 b->max_win = nla_get_u32(nla: props[TIPC_NLA_PROP_WIN]);
1148 if (props[TIPC_NLA_PROP_MTU]) {
1149 if (b->media->type_id != TIPC_MEDIA_TYPE_UDP) {
1150 NL_SET_ERR_MSG(info->extack,
1151 "MTU property is unsupported");
1152 return -EINVAL;
1153 }
1154#ifdef CONFIG_TIPC_MEDIA_UDP
1155 if (nla_get_u32(nla: props[TIPC_NLA_PROP_MTU]) <
1156 b->encap_hlen + TIPC_MIN_BEARER_MTU) {
1157 NL_SET_ERR_MSG(info->extack,
1158 "MTU value is out-of-range");
1159 return -EINVAL;
1160 }
1161 b->mtu = nla_get_u32(nla: props[TIPC_NLA_PROP_MTU]);
1162 tipc_node_apply_property(net, b, prop: TIPC_NLA_PROP_MTU);
1163#endif
1164 }
1165 }
1166
1167 return 0;
1168}
1169
1170int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
1171{
1172 int err;
1173
1174 rtnl_lock();
1175 err = __tipc_nl_bearer_set(skb, info);
1176 rtnl_unlock();
1177
1178 return err;
1179}
1180
1181static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
1182 struct tipc_media *media, int nlflags)
1183{
1184 void *hdr;
1185 struct nlattr *attrs;
1186 struct nlattr *prop;
1187
1188 hdr = genlmsg_put(skb: msg->skb, portid: msg->portid, seq: msg->seq, family: &tipc_genl_family,
1189 flags: nlflags, cmd: TIPC_NL_MEDIA_GET);
1190 if (!hdr)
1191 return -EMSGSIZE;
1192
1193 attrs = nla_nest_start_noflag(skb: msg->skb, attrtype: TIPC_NLA_MEDIA);
1194 if (!attrs)
1195 goto msg_full;
1196
1197 if (nla_put_string(skb: msg->skb, attrtype: TIPC_NLA_MEDIA_NAME, str: media->name))
1198 goto attr_msg_full;
1199
1200 prop = nla_nest_start_noflag(skb: msg->skb, attrtype: TIPC_NLA_MEDIA_PROP);
1201 if (!prop)
1202 goto prop_msg_full;
1203 if (nla_put_u32(skb: msg->skb, attrtype: TIPC_NLA_PROP_PRIO, value: media->priority))
1204 goto prop_msg_full;
1205 if (nla_put_u32(skb: msg->skb, attrtype: TIPC_NLA_PROP_TOL, value: media->tolerance))
1206 goto prop_msg_full;
1207 if (nla_put_u32(skb: msg->skb, attrtype: TIPC_NLA_PROP_WIN, value: media->max_win))
1208 goto prop_msg_full;
1209 if (media->type_id == TIPC_MEDIA_TYPE_UDP)
1210 if (nla_put_u32(skb: msg->skb, attrtype: TIPC_NLA_PROP_MTU, value: media->mtu))
1211 goto prop_msg_full;
1212
1213 nla_nest_end(skb: msg->skb, start: prop);
1214 nla_nest_end(skb: msg->skb, start: attrs);
1215 genlmsg_end(skb: msg->skb, hdr);
1216
1217 return 0;
1218
1219prop_msg_full:
1220 nla_nest_cancel(skb: msg->skb, start: prop);
1221attr_msg_full:
1222 nla_nest_cancel(skb: msg->skb, start: attrs);
1223msg_full:
1224 genlmsg_cancel(skb: msg->skb, hdr);
1225
1226 return -EMSGSIZE;
1227}
1228
1229int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
1230{
1231 int err;
1232 int i = cb->args[0];
1233 struct tipc_nl_msg msg;
1234
1235 if (i == MAX_MEDIA)
1236 return 0;
1237
1238 msg.skb = skb;
1239 msg.portid = NETLINK_CB(cb->skb).portid;
1240 msg.seq = cb->nlh->nlmsg_seq;
1241
1242 rtnl_lock();
1243 for (; media_info_array[i] != NULL; i++) {
1244 err = __tipc_nl_add_media(msg: &msg, media: media_info_array[i],
1245 NLM_F_MULTI);
1246 if (err)
1247 break;
1248 }
1249 rtnl_unlock();
1250
1251 cb->args[0] = i;
1252 return skb->len;
1253}
1254
1255int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
1256{
1257 int err;
1258 char *name;
1259 struct tipc_nl_msg msg;
1260 struct tipc_media *media;
1261 struct sk_buff *rep;
1262 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1263
1264 if (!info->attrs[TIPC_NLA_MEDIA])
1265 return -EINVAL;
1266
1267 err = nla_parse_nested_deprecated(tb: attrs, maxtype: TIPC_NLA_MEDIA_MAX,
1268 nla: info->attrs[TIPC_NLA_MEDIA],
1269 policy: tipc_nl_media_policy, extack: info->extack);
1270 if (err)
1271 return err;
1272
1273 if (!attrs[TIPC_NLA_MEDIA_NAME])
1274 return -EINVAL;
1275 name = nla_data(nla: attrs[TIPC_NLA_MEDIA_NAME]);
1276
1277 rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1278 if (!rep)
1279 return -ENOMEM;
1280
1281 msg.skb = rep;
1282 msg.portid = info->snd_portid;
1283 msg.seq = info->snd_seq;
1284
1285 rtnl_lock();
1286 media = tipc_media_find(name);
1287 if (!media) {
1288 NL_SET_ERR_MSG(info->extack, "Media not found");
1289 err = -EINVAL;
1290 goto err_out;
1291 }
1292
1293 err = __tipc_nl_add_media(msg: &msg, media, nlflags: 0);
1294 if (err)
1295 goto err_out;
1296 rtnl_unlock();
1297
1298 return genlmsg_reply(skb: rep, info);
1299err_out:
1300 rtnl_unlock();
1301 nlmsg_free(skb: rep);
1302
1303 return err;
1304}
1305
1306int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1307{
1308 int err;
1309 char *name;
1310 struct tipc_media *m;
1311 struct nlattr *attrs[TIPC_NLA_MEDIA_MAX + 1];
1312
1313 if (!info->attrs[TIPC_NLA_MEDIA])
1314 return -EINVAL;
1315
1316 err = nla_parse_nested_deprecated(tb: attrs, maxtype: TIPC_NLA_MEDIA_MAX,
1317 nla: info->attrs[TIPC_NLA_MEDIA],
1318 policy: tipc_nl_media_policy, extack: info->extack);
1319
1320 if (!attrs[TIPC_NLA_MEDIA_NAME])
1321 return -EINVAL;
1322 name = nla_data(nla: attrs[TIPC_NLA_MEDIA_NAME]);
1323
1324 m = tipc_media_find(name);
1325 if (!m) {
1326 NL_SET_ERR_MSG(info->extack, "Media not found");
1327 return -EINVAL;
1328 }
1329 if (attrs[TIPC_NLA_MEDIA_PROP]) {
1330 struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
1331
1332 err = tipc_nl_parse_link_prop(prop: attrs[TIPC_NLA_MEDIA_PROP],
1333 props);
1334 if (err)
1335 return err;
1336
1337 if (props[TIPC_NLA_PROP_TOL])
1338 m->tolerance = nla_get_u32(nla: props[TIPC_NLA_PROP_TOL]);
1339 if (props[TIPC_NLA_PROP_PRIO])
1340 m->priority = nla_get_u32(nla: props[TIPC_NLA_PROP_PRIO]);
1341 if (props[TIPC_NLA_PROP_WIN])
1342 m->max_win = nla_get_u32(nla: props[TIPC_NLA_PROP_WIN]);
1343 if (props[TIPC_NLA_PROP_MTU]) {
1344 if (m->type_id != TIPC_MEDIA_TYPE_UDP) {
1345 NL_SET_ERR_MSG(info->extack,
1346 "MTU property is unsupported");
1347 return -EINVAL;
1348 }
1349#ifdef CONFIG_TIPC_MEDIA_UDP
1350 if (tipc_udp_mtu_bad(mtu: nla_get_u32
1351 (nla: props[TIPC_NLA_PROP_MTU]))) {
1352 NL_SET_ERR_MSG(info->extack,
1353 "MTU value is out-of-range");
1354 return -EINVAL;
1355 }
1356 m->mtu = nla_get_u32(nla: props[TIPC_NLA_PROP_MTU]);
1357#endif
1358 }
1359 }
1360
1361 return 0;
1362}
1363
1364int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
1365{
1366 int err;
1367
1368 rtnl_lock();
1369 err = __tipc_nl_media_set(skb, info);
1370 rtnl_unlock();
1371
1372 return err;
1373}
1374

source code of linux/net/tipc/bearer.c