?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ALSA: usb-audio: Fix an out-of-bound read in create_composite_quirks
[linux/fpc-iii.git] / net / bridge / br_multicast.c
blob270d9c9a5331a480dd46aa4237a8b684a1137374
1 /*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13 #include <linux/err.h>
14 #include <linux/export.h>
15 #include <linux/if_ether.h>
16 #include <linux/igmp.h>
17 #include <linux/jhash.h>
18 #include <linux/kernel.h>
19 #include <linux/log2.h>
20 #include <linux/netdevice.h>
21 #include <linux/netfilter_bridge.h>
22 #include <linux/random.h>
23 #include <linux/rculist.h>
24 #include <linux/skbuff.h>
25 #include <linux/slab.h>
26 #include <linux/timer.h>
27 #include <linux/inetdevice.h>
28 #include <net/ip.h>
29 #if IS_ENABLED(CONFIG_IPV6)
30 #include <net/ipv6.h>
31 #include <net/mld.h>
32 #include <net/ip6_checksum.h>
33 #include <net/addrconf.h>
34 #endif
35
36 #include "br_private.h"
37
38 static void br_multicast_start_querier(struct net_bridge *br,
39 struct bridge_mcast_own_query *query);
40 static void br_multicast_add_router(struct net_bridge *br,
41 struct net_bridge_port *port);
42 static void br_ip4_multicast_leave_group(struct net_bridge *br,
43 struct net_bridge_port *port,
44 __be32 group,
45 __u16 vid);
46 #if IS_ENABLED(CONFIG_IPV6)
47 static void br_ip6_multicast_leave_group(struct net_bridge *br,
48 struct net_bridge_port *port,
49 const struct in6_addr *group,
50 __u16 vid);
51 #endif
52 unsigned int br_mdb_rehash_seq;
53
54 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
55 {
56 if (a->proto != b->proto)
57 return 0;
58 if (a->vid != b->vid)
59 return 0;
60 switch (a->proto) {
61 case htons(ETH_P_IP):
62 return a->u.ip4 == b->u.ip4;
63 #if IS_ENABLED(CONFIG_IPV6)
64 case htons(ETH_P_IPV6):
65 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
66 #endif
67 }
68 return 0;
69 }
70
71 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
72 __u16 vid)
73 {
74 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
75 }
76
77 #if IS_ENABLED(CONFIG_IPV6)
78 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
79 const struct in6_addr *ip,
80 __u16 vid)
81 {
82 return jhash_2words(ipv6_addr_hash(ip), vid,
83 mdb->secret) & (mdb->max - 1);
84 }
85 #endif
86
87 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
88 struct br_ip *ip)
89 {
90 switch (ip->proto) {
91 case htons(ETH_P_IP):
92 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
93 #if IS_ENABLED(CONFIG_IPV6)
94 case htons(ETH_P_IPV6):
95 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
96 #endif
97 }
98 return 0;
99 }
100
101 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
102 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
103 {
104 struct net_bridge_mdb_entry *mp;
105
106 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
107 if (br_ip_equal(&mp->addr, dst))
108 return mp;
109 }
110
111 return NULL;
112 }
113
114 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
115 struct br_ip *dst)
116 {
117 if (!mdb)
118 return NULL;
119
120 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
121 }
122
123 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
124 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
125 {
126 struct br_ip br_dst;
127
128 br_dst.u.ip4 = dst;
129 br_dst.proto = htons(ETH_P_IP);
130 br_dst.vid = vid;
131
132 return br_mdb_ip_get(mdb, &br_dst);
133 }
134
135 #if IS_ENABLED(CONFIG_IPV6)
136 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
137 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
138 __u16 vid)
139 {
140 struct br_ip br_dst;
141
142 br_dst.u.ip6 = *dst;
143 br_dst.proto = htons(ETH_P_IPV6);
144 br_dst.vid = vid;
145
146 return br_mdb_ip_get(mdb, &br_dst);
147 }
148 #endif
149
150 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
151 struct sk_buff *skb, u16 vid)
152 {
153 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
154 struct br_ip ip;
155
156 if (br->multicast_disabled)
157 return NULL;
158
159 if (BR_INPUT_SKB_CB(skb)->igmp)
160 return NULL;
161
162 ip.proto = skb->protocol;
163 ip.vid = vid;
164
165 switch (skb->protocol) {
166 case htons(ETH_P_IP):
167 ip.u.ip4 = ip_hdr(skb)->daddr;
168 break;
169 #if IS_ENABLED(CONFIG_IPV6)
170 case htons(ETH_P_IPV6):
171 ip.u.ip6 = ipv6_hdr(skb)->daddr;
172 break;
173 #endif
174 default:
175 return NULL;
176 }
177
178 return br_mdb_ip_get(mdb, &ip);
179 }
180
181 static void br_mdb_free(struct rcu_head *head)
182 {
183 struct net_bridge_mdb_htable *mdb =
184 container_of(head, struct net_bridge_mdb_htable, rcu);
185 struct net_bridge_mdb_htable *old = mdb->old;
186
187 mdb->old = NULL;
188 kfree(old->mhash);
189 kfree(old);
190 }
191
192 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
193 struct net_bridge_mdb_htable *old,
194 int elasticity)
195 {
196 struct net_bridge_mdb_entry *mp;
197 int maxlen;
198 int len;
199 int i;
200
201 for (i = 0; i < old->max; i++)
202 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
203 hlist_add_head(&mp->hlist[new->ver],
204 &new->mhash[br_ip_hash(new, &mp->addr)]);
205
206 if (!elasticity)
207 return 0;
208
209 maxlen = 0;
210 for (i = 0; i < new->max; i++) {
211 len = 0;
212 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
213 len++;
214 if (len > maxlen)
215 maxlen = len;
216 }
217
218 return maxlen > elasticity ? -EINVAL : 0;
219 }
220
221 void br_multicast_free_pg(struct rcu_head *head)
222 {
223 struct net_bridge_port_group *p =
224 container_of(head, struct net_bridge_port_group, rcu);
225
226 kfree(p);
227 }
228
229 static void br_multicast_free_group(struct rcu_head *head)
230 {
231 struct net_bridge_mdb_entry *mp =
232 container_of(head, struct net_bridge_mdb_entry, rcu);
233
234 kfree(mp);
235 }
236
237 static void br_multicast_group_expired(unsigned long data)
238 {
239 struct net_bridge_mdb_entry *mp = (void *)data;
240 struct net_bridge *br = mp->br;
241 struct net_bridge_mdb_htable *mdb;
242
243 spin_lock(&br->multicast_lock);
244 if (!netif_running(br->dev) || timer_pending(&mp->timer))
245 goto out;
246
247 mp->mglist = false;
248
249 if (mp->ports)
250 goto out;
251
252 mdb = mlock_dereference(br->mdb, br);
253
254 hlist_del_rcu(&mp->hlist[mdb->ver]);
255 mdb->size--;
256
257 call_rcu_bh(&mp->rcu, br_multicast_free_group);
258
259 out:
260 spin_unlock(&br->multicast_lock);
261 }
262
263 static void br_multicast_del_pg(struct net_bridge *br,
264 struct net_bridge_port_group *pg)
265 {
266 struct net_bridge_mdb_htable *mdb;
267 struct net_bridge_mdb_entry *mp;
268 struct net_bridge_port_group *p;
269 struct net_bridge_port_group __rcu **pp;
270
271 mdb = mlock_dereference(br->mdb, br);
272
273 mp = br_mdb_ip_get(mdb, &pg->addr);
274 if (WARN_ON(!mp))
275 return;
276
277 for (pp = &mp->ports;
278 (p = mlock_dereference(*pp, br)) != NULL;
279 pp = &p->next) {
280 if (p != pg)
281 continue;
282
283 rcu_assign_pointer(*pp, p->next);
284 hlist_del_init(&p->mglist);
285 del_timer(&p->timer);
286 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
287 p->state);
288 call_rcu_bh(&p->rcu, br_multicast_free_pg);
289
290 if (!mp->ports && !mp->mglist &&
291 netif_running(br->dev))
292 mod_timer(&mp->timer, jiffies);
293
294 return;
295 }
296
297 WARN_ON(1);
298 }
299
300 static void br_multicast_port_group_expired(unsigned long data)
301 {
302 struct net_bridge_port_group *pg = (void *)data;
303 struct net_bridge *br = pg->port->br;
304
305 spin_lock(&br->multicast_lock);
306 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
307 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
308 goto out;
309
310 br_multicast_del_pg(br, pg);
311
312 out:
313 spin_unlock(&br->multicast_lock);
314 }
315
316 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
317 int elasticity)
318 {
319 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
320 struct net_bridge_mdb_htable *mdb;
321 int err;
322
323 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
324 if (!mdb)
325 return -ENOMEM;
326
327 mdb->max = max;
328 mdb->old = old;
329
330 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
331 if (!mdb->mhash) {
332 kfree(mdb);
333 return -ENOMEM;
334 }
335
336 mdb->size = old ? old->size : 0;
337 mdb->ver = old ? old->ver ^ 1 : 0;
338
339 if (!old || elasticity)
340 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
341 else
342 mdb->secret = old->secret;
343
344 if (!old)
345 goto out;
346
347 err = br_mdb_copy(mdb, old, elasticity);
348 if (err) {
349 kfree(mdb->mhash);
350 kfree(mdb);
351 return err;
352 }
353
354 br_mdb_rehash_seq++;
355 call_rcu_bh(&mdb->rcu, br_mdb_free);
356
357 out:
358 rcu_assign_pointer(*mdbp, mdb);
359
360 return 0;
361 }
362
363 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
364 __be32 group)
365 {
366 struct sk_buff *skb;
367 struct igmphdr *ih;
368 struct ethhdr *eth;
369 struct iphdr *iph;
370
371 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
372 sizeof(*ih) + 4);
373 if (!skb)
374 goto out;
375
376 skb->protocol = htons(ETH_P_IP);
377
378 skb_reset_mac_header(skb);
379 eth = eth_hdr(skb);
380
381 ether_addr_copy(eth->h_source, br->dev->dev_addr);
382 eth->h_dest[0] = 1;
383 eth->h_dest[1] = 0;
384 eth->h_dest[2] = 0x5e;
385 eth->h_dest[3] = 0;
386 eth->h_dest[4] = 0;
387 eth->h_dest[5] = 1;
388 eth->h_proto = htons(ETH_P_IP);
389 skb_put(skb, sizeof(*eth));
390
391 skb_set_network_header(skb, skb->len);
392 iph = ip_hdr(skb);
393
394 iph->version = 4;
395 iph->ihl = 6;
396 iph->tos = 0xc0;
397 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
398 iph->id = 0;
399 iph->frag_off = htons(IP_DF);
400 iph->ttl = 1;
401 iph->protocol = IPPROTO_IGMP;
402 iph->saddr = br->multicast_query_use_ifaddr ?
403 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
404 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
405 ((u8 *)&iph[1])[0] = IPOPT_RA;
406 ((u8 *)&iph[1])[1] = 4;
407 ((u8 *)&iph[1])[2] = 0;
408 ((u8 *)&iph[1])[3] = 0;
409 ip_send_check(iph);
410 skb_put(skb, 24);
411
412 skb_set_transport_header(skb, skb->len);
413 ih = igmp_hdr(skb);
414 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
415 ih->code = (group ? br->multicast_last_member_interval :
416 br->multicast_query_response_interval) /
417 (HZ / IGMP_TIMER_SCALE);
418 ih->group = group;
419 ih->csum = 0;
420 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
421 skb_put(skb, sizeof(*ih));
422
423 __skb_pull(skb, sizeof(*eth));
424
425 out:
426 return skb;
427 }
428
429 #if IS_ENABLED(CONFIG_IPV6)
430 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
431 const struct in6_addr *group)
432 {
433 struct sk_buff *skb;
434 struct ipv6hdr *ip6h;
435 struct mld_msg *mldq;
436 struct ethhdr *eth;
437 u8 *hopopt;
438 unsigned long interval;
439
440 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
441 8 + sizeof(*mldq));
442 if (!skb)
443 goto out;
444
445 skb->protocol = htons(ETH_P_IPV6);
446
447 /* Ethernet header */
448 skb_reset_mac_header(skb);
449 eth = eth_hdr(skb);
450
451 ether_addr_copy(eth->h_source, br->dev->dev_addr);
452 eth->h_proto = htons(ETH_P_IPV6);
453 skb_put(skb, sizeof(*eth));
454
455 /* IPv6 header + HbH option */
456 skb_set_network_header(skb, skb->len);
457 ip6h = ipv6_hdr(skb);
458
459 *(__force __be32 *)ip6h = htonl(0x60000000);
460 ip6h->payload_len = htons(8 + sizeof(*mldq));
461 ip6h->nexthdr = IPPROTO_HOPOPTS;
462 ip6h->hop_limit = 1;
463 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
464 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
465 &ip6h->saddr)) {
466 kfree_skb(skb);
467 br->has_ipv6_addr = 0;
468 return NULL;
469 }
470
471 br->has_ipv6_addr = 1;
472 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
473
474 hopopt = (u8 *)(ip6h + 1);
475 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
476 hopopt[1] = 0; /* length of HbH */
477 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
478 hopopt[3] = 2; /* Length of RA Option */
479 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
480 hopopt[5] = 0;
481 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
482 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
483
484 skb_put(skb, sizeof(*ip6h) + 8);
485
486 /* ICMPv6 */
487 skb_set_transport_header(skb, skb->len);
488 mldq = (struct mld_msg *) icmp6_hdr(skb);
489
490 interval = ipv6_addr_any(group) ?
491 br->multicast_query_response_interval :
492 br->multicast_last_member_interval;
493
494 mldq->mld_type = ICMPV6_MGM_QUERY;
495 mldq->mld_code = 0;
496 mldq->mld_cksum = 0;
497 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
498 mldq->mld_reserved = 0;
499 mldq->mld_mca = *group;
500
501 /* checksum */
502 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
503 sizeof(*mldq), IPPROTO_ICMPV6,
504 csum_partial(mldq,
505 sizeof(*mldq), 0));
506 skb_put(skb, sizeof(*mldq));
507
508 __skb_pull(skb, sizeof(*eth));
509
510 out:
511 return skb;
512 }
513 #endif
514
515 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
516 struct br_ip *addr)
517 {
518 switch (addr->proto) {
519 case htons(ETH_P_IP):
520 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
521 #if IS_ENABLED(CONFIG_IPV6)
522 case htons(ETH_P_IPV6):
523 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
524 #endif
525 }
526 return NULL;
527 }
528
529 static struct net_bridge_mdb_entry *br_multicast_get_group(
530 struct net_bridge *br, struct net_bridge_port *port,
531 struct br_ip *group, int hash)
532 {
533 struct net_bridge_mdb_htable *mdb;
534 struct net_bridge_mdb_entry *mp;
535 unsigned int count = 0;
536 unsigned int max;
537 int elasticity;
538 int err;
539
540 mdb = rcu_dereference_protected(br->mdb, 1);
541 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
542 count++;
543 if (unlikely(br_ip_equal(group, &mp->addr)))
544 return mp;
545 }
546
547 elasticity = 0;
548 max = mdb->max;
549
550 if (unlikely(count > br->hash_elasticity && count)) {
551 if (net_ratelimit())
552 br_info(br, "Multicast hash table "
553 "chain limit reached: %s\n",
554 port ? port->dev->name : br->dev->name);
555
556 elasticity = br->hash_elasticity;
557 }
558
559 if (mdb->size >= max) {
560 max *= 2;
561 if (unlikely(max > br->hash_max)) {
562 br_warn(br, "Multicast hash table maximum of %d "
563 "reached, disabling snooping: %s\n",
564 br->hash_max,
565 port ? port->dev->name : br->dev->name);
566 err = -E2BIG;
567 disable:
568 br->multicast_disabled = 1;
569 goto err;
570 }
571 }
572
573 if (max > mdb->max || elasticity) {
574 if (mdb->old) {
575 if (net_ratelimit())
576 br_info(br, "Multicast hash table "
577 "on fire: %s\n",
578 port ? port->dev->name : br->dev->name);
579 err = -EEXIST;
580 goto err;
581 }
582
583 err = br_mdb_rehash(&br->mdb, max, elasticity);
584 if (err) {
585 br_warn(br, "Cannot rehash multicast "
586 "hash table, disabling snooping: %s, %d, %d\n",
587 port ? port->dev->name : br->dev->name,
588 mdb->size, err);
589 goto disable;
590 }
591
592 err = -EAGAIN;
593 goto err;
594 }
595
596 return NULL;
597
598 err:
599 mp = ERR_PTR(err);
600 return mp;
601 }
602
603 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
604 struct net_bridge_port *port, struct br_ip *group)
605 {
606 struct net_bridge_mdb_htable *mdb;
607 struct net_bridge_mdb_entry *mp;
608 int hash;
609 int err;
610
611 mdb = rcu_dereference_protected(br->mdb, 1);
612 if (!mdb) {
613 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
614 if (err)
615 return ERR_PTR(err);
616 goto rehash;
617 }
618
619 hash = br_ip_hash(mdb, group);
620 mp = br_multicast_get_group(br, port, group, hash);
621 switch (PTR_ERR(mp)) {
622 case 0:
623 break;
624
625 case -EAGAIN:
626 rehash:
627 mdb = rcu_dereference_protected(br->mdb, 1);
628 hash = br_ip_hash(mdb, group);
629 break;
630
631 default:
632 goto out;
633 }
634
635 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
636 if (unlikely(!mp))
637 return ERR_PTR(-ENOMEM);
638
639 mp->br = br;
640 mp->addr = *group;
641 setup_timer(&mp->timer, br_multicast_group_expired,
642 (unsigned long)mp);
643
644 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
645 mdb->size++;
646
647 out:
648 return mp;
649 }
650
651 struct net_bridge_port_group *br_multicast_new_port_group(
652 struct net_bridge_port *port,
653 struct br_ip *group,
654 struct net_bridge_port_group __rcu *next,
655 unsigned char state)
656 {
657 struct net_bridge_port_group *p;
658
659 p = kzalloc(sizeof(*p), GFP_ATOMIC);
660 if (unlikely(!p))
661 return NULL;
662
663 p->addr = *group;
664 p->port = port;
665 p->state = state;
666 rcu_assign_pointer(p->next, next);
667 hlist_add_head(&p->mglist, &port->mglist);
668 setup_timer(&p->timer, br_multicast_port_group_expired,
669 (unsigned long)p);
670 return p;
671 }
672
673 static int br_multicast_add_group(struct net_bridge *br,
674 struct net_bridge_port *port,
675 struct br_ip *group)
676 {
677 struct net_bridge_mdb_entry *mp;
678 struct net_bridge_port_group *p;
679 struct net_bridge_port_group __rcu **pp;
680 unsigned long now = jiffies;
681 int err;
682
683 spin_lock(&br->multicast_lock);
684 if (!netif_running(br->dev) ||
685 (port && port->state == BR_STATE_DISABLED))
686 goto out;
687
688 mp = br_multicast_new_group(br, port, group);
689 err = PTR_ERR(mp);
690 if (IS_ERR(mp))
691 goto err;
692
693 if (!port) {
694 mp->mglist = true;
695 mod_timer(&mp->timer, now + br->multicast_membership_interval);
696 goto out;
697 }
698
699 for (pp = &mp->ports;
700 (p = mlock_dereference(*pp, br)) != NULL;
701 pp = &p->next) {
702 if (p->port == port)
703 goto found;
704 if ((unsigned long)p->port < (unsigned long)port)
705 break;
706 }
707
708 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
709 if (unlikely(!p))
710 goto err;
711 rcu_assign_pointer(*pp, p);
712 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, MDB_TEMPORARY);
713
714 found:
715 mod_timer(&p->timer, now + br->multicast_membership_interval);
716 out:
717 err = 0;
718
719 err:
720 spin_unlock(&br->multicast_lock);
721 return err;
722 }
723
724 static int br_ip4_multicast_add_group(struct net_bridge *br,
725 struct net_bridge_port *port,
726 __be32 group,
727 __u16 vid)
728 {
729 struct br_ip br_group;
730
731 if (ipv4_is_local_multicast(group))
732 return 0;
733
734 br_group.u.ip4 = group;
735 br_group.proto = htons(ETH_P_IP);
736 br_group.vid = vid;
737
738 return br_multicast_add_group(br, port, &br_group);
739 }
740
741 #if IS_ENABLED(CONFIG_IPV6)
742 static int br_ip6_multicast_add_group(struct net_bridge *br,
743 struct net_bridge_port *port,
744 const struct in6_addr *group,
745 __u16 vid)
746 {
747 struct br_ip br_group;
748
749 if (ipv6_addr_is_ll_all_nodes(group))
750 return 0;
751
752 br_group.u.ip6 = *group;
753 br_group.proto = htons(ETH_P_IPV6);
754 br_group.vid = vid;
755
756 return br_multicast_add_group(br, port, &br_group);
757 }
758 #endif
759
760 static void br_multicast_router_expired(unsigned long data)
761 {
762 struct net_bridge_port *port = (void *)data;
763 struct net_bridge *br = port->br;
764
765 spin_lock(&br->multicast_lock);
766 if (port->multicast_router != 1 ||
767 timer_pending(&port->multicast_router_timer) ||
768 hlist_unhashed(&port->rlist))
769 goto out;
770
771 hlist_del_init_rcu(&port->rlist);
772 br_rtr_notify(br->dev, port, RTM_DELMDB);
773
774 out:
775 spin_unlock(&br->multicast_lock);
776 }
777
778 static void br_multicast_local_router_expired(unsigned long data)
779 {
780 }
781
782 static void br_multicast_querier_expired(struct net_bridge *br,
783 struct bridge_mcast_own_query *query)
784 {
785 spin_lock(&br->multicast_lock);
786 if (!netif_running(br->dev) || br->multicast_disabled)
787 goto out;
788
789 br_multicast_start_querier(br, query);
790
791 out:
792 spin_unlock(&br->multicast_lock);
793 }
794
795 static void br_ip4_multicast_querier_expired(unsigned long data)
796 {
797 struct net_bridge *br = (void *)data;
798
799 br_multicast_querier_expired(br, &br->ip4_own_query);
800 }
801
802 #if IS_ENABLED(CONFIG_IPV6)
803 static void br_ip6_multicast_querier_expired(unsigned long data)
804 {
805 struct net_bridge *br = (void *)data;
806
807 br_multicast_querier_expired(br, &br->ip6_own_query);
808 }
809 #endif
810
811 static void br_multicast_select_own_querier(struct net_bridge *br,
812 struct br_ip *ip,
813 struct sk_buff *skb)
814 {
815 if (ip->proto == htons(ETH_P_IP))
816 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
817 #if IS_ENABLED(CONFIG_IPV6)
818 else
819 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
820 #endif
821 }
822
823 static void __br_multicast_send_query(struct net_bridge *br,
824 struct net_bridge_port *port,
825 struct br_ip *ip)
826 {
827 struct sk_buff *skb;
828
829 skb = br_multicast_alloc_query(br, ip);
830 if (!skb)
831 return;
832
833 if (port) {
834 skb->dev = port->dev;
835 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
836 dev_net(port->dev), NULL, skb, NULL, skb->dev,
837 br_dev_queue_push_xmit);
838 } else {
839 br_multicast_select_own_querier(br, ip, skb);
840 netif_rx(skb);
841 }
842 }
843
844 static void br_multicast_send_query(struct net_bridge *br,
845 struct net_bridge_port *port,
846 struct bridge_mcast_own_query *own_query)
847 {
848 unsigned long time;
849 struct br_ip br_group;
850 struct bridge_mcast_other_query *other_query = NULL;
851
852 if (!netif_running(br->dev) || br->multicast_disabled ||
853 !br->multicast_querier)
854 return;
855
856 memset(&br_group.u, 0, sizeof(br_group.u));
857
858 if (port ? (own_query == &port->ip4_own_query) :
859 (own_query == &br->ip4_own_query)) {
860 other_query = &br->ip4_other_query;
861 br_group.proto = htons(ETH_P_IP);
862 #if IS_ENABLED(CONFIG_IPV6)
863 } else {
864 other_query = &br->ip6_other_query;
865 br_group.proto = htons(ETH_P_IPV6);
866 #endif
867 }
868
869 if (!other_query || timer_pending(&other_query->timer))
870 return;
871
872 __br_multicast_send_query(br, port, &br_group);
873
874 time = jiffies;
875 time += own_query->startup_sent < br->multicast_startup_query_count ?
876 br->multicast_startup_query_interval :
877 br->multicast_query_interval;
878 mod_timer(&own_query->timer, time);
879 }
880
881 static void
882 br_multicast_port_query_expired(struct net_bridge_port *port,
883 struct bridge_mcast_own_query *query)
884 {
885 struct net_bridge *br = port->br;
886
887 spin_lock(&br->multicast_lock);
888 if (port->state == BR_STATE_DISABLED ||
889 port->state == BR_STATE_BLOCKING)
890 goto out;
891
892 if (query->startup_sent < br->multicast_startup_query_count)
893 query->startup_sent++;
894
895 br_multicast_send_query(port->br, port, query);
896
897 out:
898 spin_unlock(&br->multicast_lock);
899 }
900
901 static void br_ip4_multicast_port_query_expired(unsigned long data)
902 {
903 struct net_bridge_port *port = (void *)data;
904
905 br_multicast_port_query_expired(port, &port->ip4_own_query);
906 }
907
908 #if IS_ENABLED(CONFIG_IPV6)
909 static void br_ip6_multicast_port_query_expired(unsigned long data)
910 {
911 struct net_bridge_port *port = (void *)data;
912
913 br_multicast_port_query_expired(port, &port->ip6_own_query);
914 }
915 #endif
916
917 void br_multicast_add_port(struct net_bridge_port *port)
918 {
919 port->multicast_router = 1;
920
921 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
922 (unsigned long)port);
923 setup_timer(&port->ip4_own_query.timer,
924 br_ip4_multicast_port_query_expired, (unsigned long)port);
925 #if IS_ENABLED(CONFIG_IPV6)
926 setup_timer(&port->ip6_own_query.timer,
927 br_ip6_multicast_port_query_expired, (unsigned long)port);
928 #endif
929 }
930
931 void br_multicast_del_port(struct net_bridge_port *port)
932 {
933 struct net_bridge *br = port->br;
934 struct net_bridge_port_group *pg;
935 struct hlist_node *n;
936
937 /* Take care of the remaining groups, only perm ones should be left */
938 spin_lock_bh(&br->multicast_lock);
939 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
940 br_multicast_del_pg(br, pg);
941 spin_unlock_bh(&br->multicast_lock);
942 del_timer_sync(&port->multicast_router_timer);
943 }
944
945 static void br_multicast_enable(struct bridge_mcast_own_query *query)
946 {
947 query->startup_sent = 0;
948
949 if (try_to_del_timer_sync(&query->timer) >= 0 ||
950 del_timer(&query->timer))
951 mod_timer(&query->timer, jiffies);
952 }
953
954 static void __br_multicast_enable_port(struct net_bridge_port *port)
955 {
956 struct net_bridge *br = port->br;
957
958 if (br->multicast_disabled || !netif_running(br->dev))
959 return;
960
961 br_multicast_enable(&port->ip4_own_query);
962 #if IS_ENABLED(CONFIG_IPV6)
963 br_multicast_enable(&port->ip6_own_query);
964 #endif
965 if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
966 br_multicast_add_router(br, port);
967 }
968
969 void br_multicast_enable_port(struct net_bridge_port *port)
970 {
971 struct net_bridge *br = port->br;
972
973 spin_lock(&br->multicast_lock);
974 __br_multicast_enable_port(port);
975 spin_unlock(&br->multicast_lock);
976 }
977
978 void br_multicast_disable_port(struct net_bridge_port *port)
979 {
980 struct net_bridge *br = port->br;
981 struct net_bridge_port_group *pg;
982 struct hlist_node *n;
983
984 spin_lock(&br->multicast_lock);
985 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
986 if (pg->state == MDB_TEMPORARY)
987 br_multicast_del_pg(br, pg);
988
989 if (!hlist_unhashed(&port->rlist)) {
990 hlist_del_init_rcu(&port->rlist);
991 br_rtr_notify(br->dev, port, RTM_DELMDB);
992 }
993 del_timer(&port->multicast_router_timer);
994 del_timer(&port->ip4_own_query.timer);
995 #if IS_ENABLED(CONFIG_IPV6)
996 del_timer(&port->ip6_own_query.timer);
997 #endif
998 spin_unlock(&br->multicast_lock);
999 }
1000
1001 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1002 struct net_bridge_port *port,
1003 struct sk_buff *skb,
1004 u16 vid)
1005 {
1006 struct igmpv3_report *ih;
1007 struct igmpv3_grec *grec;
1008 int i;
1009 int len;
1010 int num;
1011 int type;
1012 int err = 0;
1013 __be32 group;
1014
1015 ih = igmpv3_report_hdr(skb);
1016 num = ntohs(ih->ngrec);
1017 len = skb_transport_offset(skb) + sizeof(*ih);
1018
1019 for (i = 0; i < num; i++) {
1020 len += sizeof(*grec);
1021 if (!pskb_may_pull(skb, len))
1022 return -EINVAL;
1023
1024 grec = (void *)(skb->data + len - sizeof(*grec));
1025 group = grec->grec_mca;
1026 type = grec->grec_type;
1027
1028 len += ntohs(grec->grec_nsrcs) * 4;
1029 if (!pskb_may_pull(skb, len))
1030 return -EINVAL;
1031
1032 /* We treat this as an IGMPv2 report for now. */
1033 switch (type) {
1034 case IGMPV3_MODE_IS_INCLUDE:
1035 case IGMPV3_MODE_IS_EXCLUDE:
1036 case IGMPV3_CHANGE_TO_INCLUDE:
1037 case IGMPV3_CHANGE_TO_EXCLUDE:
1038 case IGMPV3_ALLOW_NEW_SOURCES:
1039 case IGMPV3_BLOCK_OLD_SOURCES:
1040 break;
1041
1042 default:
1043 continue;
1044 }
1045
1046 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1047 type == IGMPV3_MODE_IS_INCLUDE) &&
1048 ntohs(grec->grec_nsrcs) == 0) {
1049 br_ip4_multicast_leave_group(br, port, group, vid);
1050 } else {
1051 err = br_ip4_multicast_add_group(br, port, group, vid);
1052 if (err)
1053 break;
1054 }
1055 }
1056
1057 return err;
1058 }
1059
1060 #if IS_ENABLED(CONFIG_IPV6)
1061 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1062 struct net_bridge_port *port,
1063 struct sk_buff *skb,
1064 u16 vid)
1065 {
1066 struct icmp6hdr *icmp6h;
1067 struct mld2_grec *grec;
1068 int i;
1069 int len;
1070 int num;
1071 int err = 0;
1072
1073 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1074 return -EINVAL;
1075
1076 icmp6h = icmp6_hdr(skb);
1077 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1078 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1079
1080 for (i = 0; i < num; i++) {
1081 __be16 *nsrcs, _nsrcs;
1082
1083 nsrcs = skb_header_pointer(skb,
1084 len + offsetof(struct mld2_grec,
1085 grec_nsrcs),
1086 sizeof(_nsrcs), &_nsrcs);
1087 if (!nsrcs)
1088 return -EINVAL;
1089
1090 if (!pskb_may_pull(skb,
1091 len + sizeof(*grec) +
1092 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1093 return -EINVAL;
1094
1095 grec = (struct mld2_grec *)(skb->data + len);
1096 len += sizeof(*grec) +
1097 sizeof(struct in6_addr) * ntohs(*nsrcs);
1098
1099 /* We treat these as MLDv1 reports for now. */
1100 switch (grec->grec_type) {
1101 case MLD2_MODE_IS_INCLUDE:
1102 case MLD2_MODE_IS_EXCLUDE:
1103 case MLD2_CHANGE_TO_INCLUDE:
1104 case MLD2_CHANGE_TO_EXCLUDE:
1105 case MLD2_ALLOW_NEW_SOURCES:
1106 case MLD2_BLOCK_OLD_SOURCES:
1107 break;
1108
1109 default:
1110 continue;
1111 }
1112
1113 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1114 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1115 ntohs(*nsrcs) == 0) {
1116 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1117 vid);
1118 } else {
1119 err = br_ip6_multicast_add_group(br, port,
1120 &grec->grec_mca, vid);
1121 if (err)
1122 break;
1123 }
1124 }
1125
1126 return err;
1127 }
1128 #endif
1129
1130 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1131 struct net_bridge_port *port,
1132 __be32 saddr)
1133 {
1134 if (!timer_pending(&br->ip4_own_query.timer) &&
1135 !timer_pending(&br->ip4_other_query.timer))
1136 goto update;
1137
1138 if (!br->ip4_querier.addr.u.ip4)
1139 goto update;
1140
1141 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1142 goto update;
1143
1144 return false;
1145
1146 update:
1147 br->ip4_querier.addr.u.ip4 = saddr;
1148
1149 /* update protected by general multicast_lock by caller */
1150 rcu_assign_pointer(br->ip4_querier.port, port);
1151
1152 return true;
1153 }
1154
1155 #if IS_ENABLED(CONFIG_IPV6)
1156 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1157 struct net_bridge_port *port,
1158 struct in6_addr *saddr)
1159 {
1160 if (!timer_pending(&br->ip6_own_query.timer) &&
1161 !timer_pending(&br->ip6_other_query.timer))
1162 goto update;
1163
1164 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1165 goto update;
1166
1167 return false;
1168
1169 update:
1170 br->ip6_querier.addr.u.ip6 = *saddr;
1171
1172 /* update protected by general multicast_lock by caller */
1173 rcu_assign_pointer(br->ip6_querier.port, port);
1174
1175 return true;
1176 }
1177 #endif
1178
1179 static bool br_multicast_select_querier(struct net_bridge *br,
1180 struct net_bridge_port *port,
1181 struct br_ip *saddr)
1182 {
1183 switch (saddr->proto) {
1184 case htons(ETH_P_IP):
1185 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1186 #if IS_ENABLED(CONFIG_IPV6)
1187 case htons(ETH_P_IPV6):
1188 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1189 #endif
1190 }
1191
1192 return false;
1193 }
1194
1195 static void
1196 br_multicast_update_query_timer(struct net_bridge *br,
1197 struct bridge_mcast_other_query *query,
1198 unsigned long max_delay)
1199 {
1200 if (!timer_pending(&query->timer))
1201 query->delay_time = jiffies + max_delay;
1202
1203 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1204 }
1205
1206 /*
1207 * Add port to router_list
1208 * list is maintained ordered by pointer value
1209 * and locked by br->multicast_lock and RCU
1210 */
1211 static void br_multicast_add_router(struct net_bridge *br,
1212 struct net_bridge_port *port)
1213 {
1214 struct net_bridge_port *p;
1215 struct hlist_node *slot = NULL;
1216
1217 if (!hlist_unhashed(&port->rlist))
1218 return;
1219
1220 hlist_for_each_entry(p, &br->router_list, rlist) {
1221 if ((unsigned long) port >= (unsigned long) p)
1222 break;
1223 slot = &p->rlist;
1224 }
1225
1226 if (slot)
1227 hlist_add_behind_rcu(&port->rlist, slot);
1228 else
1229 hlist_add_head_rcu(&port->rlist, &br->router_list);
1230 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1231 }
1232
1233 static void br_multicast_mark_router(struct net_bridge *br,
1234 struct net_bridge_port *port)
1235 {
1236 unsigned long now = jiffies;
1237
1238 if (!port) {
1239 if (br->multicast_router == 1)
1240 mod_timer(&br->multicast_router_timer,
1241 now + br->multicast_querier_interval);
1242 return;
1243 }
1244
1245 if (port->multicast_router != 1)
1246 return;
1247
1248 br_multicast_add_router(br, port);
1249
1250 mod_timer(&port->multicast_router_timer,
1251 now + br->multicast_querier_interval);
1252 }
1253
1254 static void br_multicast_query_received(struct net_bridge *br,
1255 struct net_bridge_port *port,
1256 struct bridge_mcast_other_query *query,
1257 struct br_ip *saddr,
1258 unsigned long max_delay)
1259 {
1260 if (!br_multicast_select_querier(br, port, saddr))
1261 return;
1262
1263 br_multicast_update_query_timer(br, query, max_delay);
1264
1265 /* Based on RFC4541, section 2.1.1 IGMP Forwarding Rules,
1266 * the arrival port for IGMP Queries where the source address
1267 * is 0.0.0.0 should not be added to router port list.
1268 */
1269 if ((saddr->proto == htons(ETH_P_IP) && saddr->u.ip4) ||
1270 saddr->proto == htons(ETH_P_IPV6))
1271 br_multicast_mark_router(br, port);
1272 }
1273
1274 static int br_ip4_multicast_query(struct net_bridge *br,
1275 struct net_bridge_port *port,
1276 struct sk_buff *skb,
1277 u16 vid)
1278 {
1279 const struct iphdr *iph = ip_hdr(skb);
1280 struct igmphdr *ih = igmp_hdr(skb);
1281 struct net_bridge_mdb_entry *mp;
1282 struct igmpv3_query *ih3;
1283 struct net_bridge_port_group *p;
1284 struct net_bridge_port_group __rcu **pp;
1285 struct br_ip saddr;
1286 unsigned long max_delay;
1287 unsigned long now = jiffies;
1288 unsigned int offset = skb_transport_offset(skb);
1289 __be32 group;
1290 int err = 0;
1291
1292 spin_lock(&br->multicast_lock);
1293 if (!netif_running(br->dev) ||
1294 (port && port->state == BR_STATE_DISABLED))
1295 goto out;
1296
1297 group = ih->group;
1298
1299 if (skb->len == offset + sizeof(*ih)) {
1300 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1301
1302 if (!max_delay) {
1303 max_delay = 10 * HZ;
1304 group = 0;
1305 }
1306 } else if (skb->len >= offset + sizeof(*ih3)) {
1307 ih3 = igmpv3_query_hdr(skb);
1308 if (ih3->nsrcs)
1309 goto out;
1310
1311 max_delay = ih3->code ?
1312 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1313 } else {
1314 goto out;
1315 }
1316
1317 if (!group) {
1318 saddr.proto = htons(ETH_P_IP);
1319 saddr.u.ip4 = iph->saddr;
1320
1321 br_multicast_query_received(br, port, &br->ip4_other_query,
1322 &saddr, max_delay);
1323 goto out;
1324 }
1325
1326 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1327 if (!mp)
1328 goto out;
1329
1330 max_delay *= br->multicast_last_member_count;
1331
1332 if (mp->mglist &&
1333 (timer_pending(&mp->timer) ?
1334 time_after(mp->timer.expires, now + max_delay) :
1335 try_to_del_timer_sync(&mp->timer) >= 0))
1336 mod_timer(&mp->timer, now + max_delay);
1337
1338 for (pp = &mp->ports;
1339 (p = mlock_dereference(*pp, br)) != NULL;
1340 pp = &p->next) {
1341 if (timer_pending(&p->timer) ?
1342 time_after(p->timer.expires, now + max_delay) :
1343 try_to_del_timer_sync(&p->timer) >= 0)
1344 mod_timer(&p->timer, now + max_delay);
1345 }
1346
1347 out:
1348 spin_unlock(&br->multicast_lock);
1349 return err;
1350 }
1351
1352 #if IS_ENABLED(CONFIG_IPV6)
1353 static int br_ip6_multicast_query(struct net_bridge *br,
1354 struct net_bridge_port *port,
1355 struct sk_buff *skb,
1356 u16 vid)
1357 {
1358 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1359 struct mld_msg *mld;
1360 struct net_bridge_mdb_entry *mp;
1361 struct mld2_query *mld2q;
1362 struct net_bridge_port_group *p;
1363 struct net_bridge_port_group __rcu **pp;
1364 struct br_ip saddr;
1365 unsigned long max_delay;
1366 unsigned long now = jiffies;
1367 unsigned int offset = skb_transport_offset(skb);
1368 const struct in6_addr *group = NULL;
1369 bool is_general_query;
1370 int err = 0;
1371
1372 spin_lock(&br->multicast_lock);
1373 if (!netif_running(br->dev) ||
1374 (port && port->state == BR_STATE_DISABLED))
1375 goto out;
1376
1377 if (skb->len == offset + sizeof(*mld)) {
1378 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1379 err = -EINVAL;
1380 goto out;
1381 }
1382 mld = (struct mld_msg *) icmp6_hdr(skb);
1383 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1384 if (max_delay)
1385 group = &mld->mld_mca;
1386 } else {
1387 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1388 err = -EINVAL;
1389 goto out;
1390 }
1391 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1392 if (!mld2q->mld2q_nsrcs)
1393 group = &mld2q->mld2q_mca;
1394
1395 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1396 }
1397
1398 is_general_query = group && ipv6_addr_any(group);
1399
1400 if (is_general_query) {
1401 saddr.proto = htons(ETH_P_IPV6);
1402 saddr.u.ip6 = ip6h->saddr;
1403
1404 br_multicast_query_received(br, port, &br->ip6_other_query,
1405 &saddr, max_delay);
1406 goto out;
1407 } else if (!group) {
1408 goto out;
1409 }
1410
1411 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1412 if (!mp)
1413 goto out;
1414
1415 max_delay *= br->multicast_last_member_count;
1416 if (mp->mglist &&
1417 (timer_pending(&mp->timer) ?
1418 time_after(mp->timer.expires, now + max_delay) :
1419 try_to_del_timer_sync(&mp->timer) >= 0))
1420 mod_timer(&mp->timer, now + max_delay);
1421
1422 for (pp = &mp->ports;
1423 (p = mlock_dereference(*pp, br)) != NULL;
1424 pp = &p->next) {
1425 if (timer_pending(&p->timer) ?
1426 time_after(p->timer.expires, now + max_delay) :
1427 try_to_del_timer_sync(&p->timer) >= 0)
1428 mod_timer(&p->timer, now + max_delay);
1429 }
1430
1431 out:
1432 spin_unlock(&br->multicast_lock);
1433 return err;
1434 }
1435 #endif
1436
1437 static void
1438 br_multicast_leave_group(struct net_bridge *br,
1439 struct net_bridge_port *port,
1440 struct br_ip *group,
1441 struct bridge_mcast_other_query *other_query,
1442 struct bridge_mcast_own_query *own_query)
1443 {
1444 struct net_bridge_mdb_htable *mdb;
1445 struct net_bridge_mdb_entry *mp;
1446 struct net_bridge_port_group *p;
1447 unsigned long now;
1448 unsigned long time;
1449
1450 spin_lock(&br->multicast_lock);
1451 if (!netif_running(br->dev) ||
1452 (port && port->state == BR_STATE_DISABLED))
1453 goto out;
1454
1455 mdb = mlock_dereference(br->mdb, br);
1456 mp = br_mdb_ip_get(mdb, group);
1457 if (!mp)
1458 goto out;
1459
1460 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1461 struct net_bridge_port_group __rcu **pp;
1462
1463 for (pp = &mp->ports;
1464 (p = mlock_dereference(*pp, br)) != NULL;
1465 pp = &p->next) {
1466 if (p->port != port)
1467 continue;
1468
1469 rcu_assign_pointer(*pp, p->next);
1470 hlist_del_init(&p->mglist);
1471 del_timer(&p->timer);
1472 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1473 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1474 p->state);
1475
1476 if (!mp->ports && !mp->mglist &&
1477 netif_running(br->dev))
1478 mod_timer(&mp->timer, jiffies);
1479 }
1480 goto out;
1481 }
1482
1483 if (timer_pending(&other_query->timer))
1484 goto out;
1485
1486 if (br->multicast_querier) {
1487 __br_multicast_send_query(br, port, &mp->addr);
1488
1489 time = jiffies + br->multicast_last_member_count *
1490 br->multicast_last_member_interval;
1491
1492 mod_timer(&own_query->timer, time);
1493
1494 for (p = mlock_dereference(mp->ports, br);
1495 p != NULL;
1496 p = mlock_dereference(p->next, br)) {
1497 if (p->port != port)
1498 continue;
1499
1500 if (!hlist_unhashed(&p->mglist) &&
1501 (timer_pending(&p->timer) ?
1502 time_after(p->timer.expires, time) :
1503 try_to_del_timer_sync(&p->timer) >= 0)) {
1504 mod_timer(&p->timer, time);
1505 }
1506
1507 break;
1508 }
1509 }
1510
1511 now = jiffies;
1512 time = now + br->multicast_last_member_count *
1513 br->multicast_last_member_interval;
1514
1515 if (!port) {
1516 if (mp->mglist &&
1517 (timer_pending(&mp->timer) ?
1518 time_after(mp->timer.expires, time) :
1519 try_to_del_timer_sync(&mp->timer) >= 0)) {
1520 mod_timer(&mp->timer, time);
1521 }
1522
1523 goto out;
1524 }
1525
1526 for (p = mlock_dereference(mp->ports, br);
1527 p != NULL;
1528 p = mlock_dereference(p->next, br)) {
1529 if (p->port != port)
1530 continue;
1531
1532 if (!hlist_unhashed(&p->mglist) &&
1533 (timer_pending(&p->timer) ?
1534 time_after(p->timer.expires, time) :
1535 try_to_del_timer_sync(&p->timer) >= 0)) {
1536 mod_timer(&p->timer, time);
1537 }
1538
1539 break;
1540 }
1541 out:
1542 spin_unlock(&br->multicast_lock);
1543 }
1544
1545 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1546 struct net_bridge_port *port,
1547 __be32 group,
1548 __u16 vid)
1549 {
1550 struct br_ip br_group;
1551 struct bridge_mcast_own_query *own_query;
1552
1553 if (ipv4_is_local_multicast(group))
1554 return;
1555
1556 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1557
1558 br_group.u.ip4 = group;
1559 br_group.proto = htons(ETH_P_IP);
1560 br_group.vid = vid;
1561
1562 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1563 own_query);
1564 }
1565
1566 #if IS_ENABLED(CONFIG_IPV6)
1567 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1568 struct net_bridge_port *port,
1569 const struct in6_addr *group,
1570 __u16 vid)
1571 {
1572 struct br_ip br_group;
1573 struct bridge_mcast_own_query *own_query;
1574
1575 if (ipv6_addr_is_ll_all_nodes(group))
1576 return;
1577
1578 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1579
1580 br_group.u.ip6 = *group;
1581 br_group.proto = htons(ETH_P_IPV6);
1582 br_group.vid = vid;
1583
1584 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1585 own_query);
1586 }
1587 #endif
1588
1589 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1590 struct net_bridge_port *port,
1591 struct sk_buff *skb,
1592 u16 vid)
1593 {
1594 struct sk_buff *skb_trimmed = NULL;
1595 struct igmphdr *ih;
1596 int err;
1597
1598 err = ip_mc_check_igmp(skb, &skb_trimmed);
1599
1600 if (err == -ENOMSG) {
1601 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1602 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1603 return 0;
1604 } else if (err < 0) {
1605 return err;
1606 }
1607
1608 BR_INPUT_SKB_CB(skb)->igmp = 1;
1609 ih = igmp_hdr(skb);
1610
1611 switch (ih->type) {
1612 case IGMP_HOST_MEMBERSHIP_REPORT:
1613 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1614 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1615 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1616 break;
1617 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1618 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1619 break;
1620 case IGMP_HOST_MEMBERSHIP_QUERY:
1621 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1622 break;
1623 case IGMP_HOST_LEAVE_MESSAGE:
1624 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1625 break;
1626 }
1627
1628 if (skb_trimmed && skb_trimmed != skb)
1629 kfree_skb(skb_trimmed);
1630
1631 return err;
1632 }
1633
1634 #if IS_ENABLED(CONFIG_IPV6)
1635 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1636 struct net_bridge_port *port,
1637 struct sk_buff *skb,
1638 u16 vid)
1639 {
1640 struct sk_buff *skb_trimmed = NULL;
1641 struct mld_msg *mld;
1642 int err;
1643
1644 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1645
1646 if (err == -ENOMSG) {
1647 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1648 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1649 return 0;
1650 } else if (err < 0) {
1651 return err;
1652 }
1653
1654 BR_INPUT_SKB_CB(skb)->igmp = 1;
1655 mld = (struct mld_msg *)skb_transport_header(skb);
1656
1657 switch (mld->mld_type) {
1658 case ICMPV6_MGM_REPORT:
1659 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1660 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1661 break;
1662 case ICMPV6_MLD2_REPORT:
1663 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1664 break;
1665 case ICMPV6_MGM_QUERY:
1666 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1667 break;
1668 case ICMPV6_MGM_REDUCTION:
1669 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1670 break;
1671 }
1672
1673 if (skb_trimmed && skb_trimmed != skb)
1674 kfree_skb(skb_trimmed);
1675
1676 return err;
1677 }
1678 #endif
1679
1680 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1681 struct sk_buff *skb, u16 vid)
1682 {
1683 BR_INPUT_SKB_CB(skb)->igmp = 0;
1684 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1685
1686 if (br->multicast_disabled)
1687 return 0;
1688
1689 switch (skb->protocol) {
1690 case htons(ETH_P_IP):
1691 return br_multicast_ipv4_rcv(br, port, skb, vid);
1692 #if IS_ENABLED(CONFIG_IPV6)
1693 case htons(ETH_P_IPV6):
1694 return br_multicast_ipv6_rcv(br, port, skb, vid);
1695 #endif
1696 }
1697
1698 return 0;
1699 }
1700
1701 static void br_multicast_query_expired(struct net_bridge *br,
1702 struct bridge_mcast_own_query *query,
1703 struct bridge_mcast_querier *querier)
1704 {
1705 spin_lock(&br->multicast_lock);
1706 if (query->startup_sent < br->multicast_startup_query_count)
1707 query->startup_sent++;
1708
1709 RCU_INIT_POINTER(querier->port, NULL);
1710 br_multicast_send_query(br, NULL, query);
1711 spin_unlock(&br->multicast_lock);
1712 }
1713
1714 static void br_ip4_multicast_query_expired(unsigned long data)
1715 {
1716 struct net_bridge *br = (void *)data;
1717
1718 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1719 }
1720
1721 #if IS_ENABLED(CONFIG_IPV6)
1722 static void br_ip6_multicast_query_expired(unsigned long data)
1723 {
1724 struct net_bridge *br = (void *)data;
1725
1726 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1727 }
1728 #endif
1729
1730 void br_multicast_init(struct net_bridge *br)
1731 {
1732 br->hash_elasticity = 4;
1733 br->hash_max = 512;
1734
1735 br->multicast_router = 1;
1736 br->multicast_querier = 0;
1737 br->multicast_query_use_ifaddr = 0;
1738 br->multicast_last_member_count = 2;
1739 br->multicast_startup_query_count = 2;
1740
1741 br->multicast_last_member_interval = HZ;
1742 br->multicast_query_response_interval = 10 * HZ;
1743 br->multicast_startup_query_interval = 125 * HZ / 4;
1744 br->multicast_query_interval = 125 * HZ;
1745 br->multicast_querier_interval = 255 * HZ;
1746 br->multicast_membership_interval = 260 * HZ;
1747
1748 br->ip4_other_query.delay_time = 0;
1749 br->ip4_querier.port = NULL;
1750 #if IS_ENABLED(CONFIG_IPV6)
1751 br->ip6_other_query.delay_time = 0;
1752 br->ip6_querier.port = NULL;
1753 #endif
1754 br->has_ipv6_addr = 1;
1755
1756 spin_lock_init(&br->multicast_lock);
1757 setup_timer(&br->multicast_router_timer,
1758 br_multicast_local_router_expired, 0);
1759 setup_timer(&br->ip4_other_query.timer,
1760 br_ip4_multicast_querier_expired, (unsigned long)br);
1761 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1762 (unsigned long)br);
1763 #if IS_ENABLED(CONFIG_IPV6)
1764 setup_timer(&br->ip6_other_query.timer,
1765 br_ip6_multicast_querier_expired, (unsigned long)br);
1766 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1767 (unsigned long)br);
1768 #endif
1769 }
1770
1771 static void __br_multicast_open(struct net_bridge *br,
1772 struct bridge_mcast_own_query *query)
1773 {
1774 query->startup_sent = 0;
1775
1776 if (br->multicast_disabled)
1777 return;
1778
1779 mod_timer(&query->timer, jiffies);
1780 }
1781
1782 void br_multicast_open(struct net_bridge *br)
1783 {
1784 __br_multicast_open(br, &br->ip4_own_query);
1785 #if IS_ENABLED(CONFIG_IPV6)
1786 __br_multicast_open(br, &br->ip6_own_query);
1787 #endif
1788 }
1789
1790 void br_multicast_stop(struct net_bridge *br)
1791 {
1792 del_timer_sync(&br->multicast_router_timer);
1793 del_timer_sync(&br->ip4_other_query.timer);
1794 del_timer_sync(&br->ip4_own_query.timer);
1795 #if IS_ENABLED(CONFIG_IPV6)
1796 del_timer_sync(&br->ip6_other_query.timer);
1797 del_timer_sync(&br->ip6_own_query.timer);
1798 #endif
1799 }
1800
1801 void br_multicast_dev_del(struct net_bridge *br)
1802 {
1803 struct net_bridge_mdb_htable *mdb;
1804 struct net_bridge_mdb_entry *mp;
1805 struct hlist_node *n;
1806 u32 ver;
1807 int i;
1808
1809 spin_lock_bh(&br->multicast_lock);
1810 mdb = mlock_dereference(br->mdb, br);
1811 if (!mdb)
1812 goto out;
1813
1814 br->mdb = NULL;
1815
1816 ver = mdb->ver;
1817 for (i = 0; i < mdb->max; i++) {
1818 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1819 hlist[ver]) {
1820 del_timer(&mp->timer);
1821 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1822 }
1823 }
1824
1825 if (mdb->old) {
1826 spin_unlock_bh(&br->multicast_lock);
1827 rcu_barrier_bh();
1828 spin_lock_bh(&br->multicast_lock);
1829 WARN_ON(mdb->old);
1830 }
1831
1832 mdb->old = mdb;
1833 call_rcu_bh(&mdb->rcu, br_mdb_free);
1834
1835 out:
1836 spin_unlock_bh(&br->multicast_lock);
1837 }
1838
1839 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1840 {
1841 int err = -EINVAL;
1842
1843 spin_lock_bh(&br->multicast_lock);
1844
1845 switch (val) {
1846 case 0:
1847 case 2:
1848 del_timer(&br->multicast_router_timer);
1849 /* fall through */
1850 case 1:
1851 br->multicast_router = val;
1852 err = 0;
1853 break;
1854 }
1855
1856 spin_unlock_bh(&br->multicast_lock);
1857
1858 return err;
1859 }
1860
1861 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1862 {
1863 struct net_bridge *br = p->br;
1864 int err = -EINVAL;
1865
1866 spin_lock(&br->multicast_lock);
1867
1868 switch (val) {
1869 case 0:
1870 case 1:
1871 case 2:
1872 p->multicast_router = val;
1873 err = 0;
1874
1875 if (val < 2 && !hlist_unhashed(&p->rlist)) {
1876 hlist_del_init_rcu(&p->rlist);
1877 br_rtr_notify(br->dev, p, RTM_DELMDB);
1878 }
1879
1880 if (val == 1)
1881 break;
1882
1883 del_timer(&p->multicast_router_timer);
1884
1885 if (val == 0)
1886 break;
1887
1888 br_multicast_add_router(br, p);
1889 break;
1890 }
1891
1892 spin_unlock(&br->multicast_lock);
1893
1894 return err;
1895 }
1896
1897 static void br_multicast_start_querier(struct net_bridge *br,
1898 struct bridge_mcast_own_query *query)
1899 {
1900 struct net_bridge_port *port;
1901
1902 __br_multicast_open(br, query);
1903
1904 list_for_each_entry(port, &br->port_list, list) {
1905 if (port->state == BR_STATE_DISABLED ||
1906 port->state == BR_STATE_BLOCKING)
1907 continue;
1908
1909 if (query == &br->ip4_own_query)
1910 br_multicast_enable(&port->ip4_own_query);
1911 #if IS_ENABLED(CONFIG_IPV6)
1912 else
1913 br_multicast_enable(&port->ip6_own_query);
1914 #endif
1915 }
1916 }
1917
1918 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1919 {
1920 struct net_bridge_mdb_htable *mdb;
1921 struct net_bridge_port *port;
1922 int err = 0;
1923
1924 spin_lock_bh(&br->multicast_lock);
1925 if (br->multicast_disabled == !val)
1926 goto unlock;
1927
1928 br->multicast_disabled = !val;
1929 if (br->multicast_disabled)
1930 goto unlock;
1931
1932 if (!netif_running(br->dev))
1933 goto unlock;
1934
1935 mdb = mlock_dereference(br->mdb, br);
1936 if (mdb) {
1937 if (mdb->old) {
1938 err = -EEXIST;
1939 rollback:
1940 br->multicast_disabled = !!val;
1941 goto unlock;
1942 }
1943
1944 err = br_mdb_rehash(&br->mdb, mdb->max,
1945 br->hash_elasticity);
1946 if (err)
1947 goto rollback;
1948 }
1949
1950 br_multicast_open(br);
1951 list_for_each_entry(port, &br->port_list, list)
1952 __br_multicast_enable_port(port);
1953
1954 unlock:
1955 spin_unlock_bh(&br->multicast_lock);
1956
1957 return err;
1958 }
1959
1960 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1961 {
1962 unsigned long max_delay;
1963
1964 val = !!val;
1965
1966 spin_lock_bh(&br->multicast_lock);
1967 if (br->multicast_querier == val)
1968 goto unlock;
1969
1970 br->multicast_querier = val;
1971 if (!val)
1972 goto unlock;
1973
1974 max_delay = br->multicast_query_response_interval;
1975
1976 if (!timer_pending(&br->ip4_other_query.timer))
1977 br->ip4_other_query.delay_time = jiffies + max_delay;
1978
1979 br_multicast_start_querier(br, &br->ip4_own_query);
1980
1981 #if IS_ENABLED(CONFIG_IPV6)
1982 if (!timer_pending(&br->ip6_other_query.timer))
1983 br->ip6_other_query.delay_time = jiffies + max_delay;
1984
1985 br_multicast_start_querier(br, &br->ip6_own_query);
1986 #endif
1987
1988 unlock:
1989 spin_unlock_bh(&br->multicast_lock);
1990
1991 return 0;
1992 }
1993
1994 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1995 {
1996 int err = -EINVAL;
1997 u32 old;
1998 struct net_bridge_mdb_htable *mdb;
1999
2000 spin_lock_bh(&br->multicast_lock);
2001 if (!is_power_of_2(val))
2002 goto unlock;
2003
2004 mdb = mlock_dereference(br->mdb, br);
2005 if (mdb && val < mdb->size)
2006 goto unlock;
2007
2008 err = 0;
2009
2010 old = br->hash_max;
2011 br->hash_max = val;
2012
2013 if (mdb) {
2014 if (mdb->old) {
2015 err = -EEXIST;
2016 rollback:
2017 br->hash_max = old;
2018 goto unlock;
2019 }
2020
2021 err = br_mdb_rehash(&br->mdb, br->hash_max,
2022 br->hash_elasticity);
2023 if (err)
2024 goto rollback;
2025 }
2026
2027 unlock:
2028 spin_unlock_bh(&br->multicast_lock);
2029
2030 return err;
2031 }
2032
2033 /**
2034 * br_multicast_list_adjacent - Returns snooped multicast addresses
2035 * @dev: The bridge port adjacent to which to retrieve addresses
2036 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2037 *
2038 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2039 * snooping feature on all bridge ports of dev's bridge device, excluding
2040 * the addresses from dev itself.
2041 *
2042 * Returns the number of items added to br_ip_list.
2043 *
2044 * Notes:
2045 * - br_ip_list needs to be initialized by caller
2046 * - br_ip_list might contain duplicates in the end
2047 * (needs to be taken care of by caller)
2048 * - br_ip_list needs to be freed by caller
2049 */
2050 int br_multicast_list_adjacent(struct net_device *dev,
2051 struct list_head *br_ip_list)
2052 {
2053 struct net_bridge *br;
2054 struct net_bridge_port *port;
2055 struct net_bridge_port_group *group;
2056 struct br_ip_list *entry;
2057 int count = 0;
2058
2059 rcu_read_lock();
2060 if (!br_ip_list || !br_port_exists(dev))
2061 goto unlock;
2062
2063 port = br_port_get_rcu(dev);
2064 if (!port || !port->br)
2065 goto unlock;
2066
2067 br = port->br;
2068
2069 list_for_each_entry_rcu(port, &br->port_list, list) {
2070 if (!port->dev || port->dev == dev)
2071 continue;
2072
2073 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2074 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2075 if (!entry)
2076 goto unlock;
2077
2078 entry->addr = group->addr;
2079 list_add(&entry->list, br_ip_list);
2080 count++;
2081 }
2082 }
2083
2084 unlock:
2085 rcu_read_unlock();
2086 return count;
2087 }
2088 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2089
2090 /**
2091 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2092 * @dev: The bridge port providing the bridge on which to check for a querier
2093 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2094 *
2095 * Checks whether the given interface has a bridge on top and if so returns
2096 * true if a valid querier exists anywhere on the bridged link layer.
2097 * Otherwise returns false.
2098 */
2099 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2100 {
2101 struct net_bridge *br;
2102 struct net_bridge_port *port;
2103 struct ethhdr eth;
2104 bool ret = false;
2105
2106 rcu_read_lock();
2107 if (!br_port_exists(dev))
2108 goto unlock;
2109
2110 port = br_port_get_rcu(dev);
2111 if (!port || !port->br)
2112 goto unlock;
2113
2114 br = port->br;
2115
2116 memset(&eth, 0, sizeof(eth));
2117 eth.h_proto = htons(proto);
2118
2119 ret = br_multicast_querier_exists(br, &eth);
2120
2121 unlock:
2122 rcu_read_unlock();
2123 return ret;
2124 }
2125 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2126
2127 /**
2128 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2129 * @dev: The bridge port adjacent to which to check for a querier
2130 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2131 *
2132 * Checks whether the given interface has a bridge on top and if so returns
2133 * true if a selected querier is behind one of the other ports of this
2134 * bridge. Otherwise returns false.
2135 */
2136 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2137 {
2138 struct net_bridge *br;
2139 struct net_bridge_port *port;
2140 bool ret = false;
2141
2142 rcu_read_lock();
2143 if (!br_port_exists(dev))
2144 goto unlock;
2145
2146 port = br_port_get_rcu(dev);
2147 if (!port || !port->br)
2148 goto unlock;
2149
2150 br = port->br;
2151
2152 switch (proto) {
2153 case ETH_P_IP:
2154 if (!timer_pending(&br->ip4_other_query.timer) ||
2155 rcu_dereference(br->ip4_querier.port) == port)
2156 goto unlock;
2157 break;
2158 #if IS_ENABLED(CONFIG_IPV6)
2159 case ETH_P_IPV6:
2160 if (!timer_pending(&br->ip6_other_query.timer) ||
2161 rcu_dereference(br->ip6_querier.port) == port)
2162 goto unlock;
2163 break;
2164 #endif
2165 default:
2166 goto unlock;
2167 }
2168
2169 ret = true;
2170 unlock:
2171 rcu_read_unlock();
2172 return ret;
2173 }
2174 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
Linux with added FPC-III support