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