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