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Merge tag 'keys-next-20160511' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowe...
[deliverable/linux.git] / net / bridge / br_multicast.c
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->flags);
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->flags & MDB_PG_FLAGS_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 return NULL;
468 }
469 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
470
471 hopopt = (u8 *)(ip6h + 1);
472 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
473 hopopt[1] = 0; /* length of HbH */
474 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
475 hopopt[3] = 2; /* Length of RA Option */
476 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
477 hopopt[5] = 0;
478 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
479 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
480
481 skb_put(skb, sizeof(*ip6h) + 8);
482
483 /* ICMPv6 */
484 skb_set_transport_header(skb, skb->len);
485 mldq = (struct mld_msg *) icmp6_hdr(skb);
486
487 interval = ipv6_addr_any(group) ?
488 br->multicast_query_response_interval :
489 br->multicast_last_member_interval;
490
491 mldq->mld_type = ICMPV6_MGM_QUERY;
492 mldq->mld_code = 0;
493 mldq->mld_cksum = 0;
494 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
495 mldq->mld_reserved = 0;
496 mldq->mld_mca = *group;
497
498 /* checksum */
499 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
500 sizeof(*mldq), IPPROTO_ICMPV6,
501 csum_partial(mldq,
502 sizeof(*mldq), 0));
503 skb_put(skb, sizeof(*mldq));
504
505 __skb_pull(skb, sizeof(*eth));
506
507 out:
508 return skb;
509 }
510 #endif
511
512 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
513 struct br_ip *addr)
514 {
515 switch (addr->proto) {
516 case htons(ETH_P_IP):
517 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
518 #if IS_ENABLED(CONFIG_IPV6)
519 case htons(ETH_P_IPV6):
520 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
521 #endif
522 }
523 return NULL;
524 }
525
526 static struct net_bridge_mdb_entry *br_multicast_get_group(
527 struct net_bridge *br, struct net_bridge_port *port,
528 struct br_ip *group, int hash)
529 {
530 struct net_bridge_mdb_htable *mdb;
531 struct net_bridge_mdb_entry *mp;
532 unsigned int count = 0;
533 unsigned int max;
534 int elasticity;
535 int err;
536
537 mdb = rcu_dereference_protected(br->mdb, 1);
538 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
539 count++;
540 if (unlikely(br_ip_equal(group, &mp->addr)))
541 return mp;
542 }
543
544 elasticity = 0;
545 max = mdb->max;
546
547 if (unlikely(count > br->hash_elasticity && count)) {
548 if (net_ratelimit())
549 br_info(br, "Multicast hash table "
550 "chain limit reached: %s\n",
551 port ? port->dev->name : br->dev->name);
552
553 elasticity = br->hash_elasticity;
554 }
555
556 if (mdb->size >= max) {
557 max *= 2;
558 if (unlikely(max > br->hash_max)) {
559 br_warn(br, "Multicast hash table maximum of %d "
560 "reached, disabling snooping: %s\n",
561 br->hash_max,
562 port ? port->dev->name : br->dev->name);
563 err = -E2BIG;
564 disable:
565 br->multicast_disabled = 1;
566 goto err;
567 }
568 }
569
570 if (max > mdb->max || elasticity) {
571 if (mdb->old) {
572 if (net_ratelimit())
573 br_info(br, "Multicast hash table "
574 "on fire: %s\n",
575 port ? port->dev->name : br->dev->name);
576 err = -EEXIST;
577 goto err;
578 }
579
580 err = br_mdb_rehash(&br->mdb, max, elasticity);
581 if (err) {
582 br_warn(br, "Cannot rehash multicast "
583 "hash table, disabling snooping: %s, %d, %d\n",
584 port ? port->dev->name : br->dev->name,
585 mdb->size, err);
586 goto disable;
587 }
588
589 err = -EAGAIN;
590 goto err;
591 }
592
593 return NULL;
594
595 err:
596 mp = ERR_PTR(err);
597 return mp;
598 }
599
600 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
601 struct net_bridge_port *port, struct br_ip *group)
602 {
603 struct net_bridge_mdb_htable *mdb;
604 struct net_bridge_mdb_entry *mp;
605 int hash;
606 int err;
607
608 mdb = rcu_dereference_protected(br->mdb, 1);
609 if (!mdb) {
610 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
611 if (err)
612 return ERR_PTR(err);
613 goto rehash;
614 }
615
616 hash = br_ip_hash(mdb, group);
617 mp = br_multicast_get_group(br, port, group, hash);
618 switch (PTR_ERR(mp)) {
619 case 0:
620 break;
621
622 case -EAGAIN:
623 rehash:
624 mdb = rcu_dereference_protected(br->mdb, 1);
625 hash = br_ip_hash(mdb, group);
626 break;
627
628 default:
629 goto out;
630 }
631
632 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
633 if (unlikely(!mp))
634 return ERR_PTR(-ENOMEM);
635
636 mp->br = br;
637 mp->addr = *group;
638 setup_timer(&mp->timer, br_multicast_group_expired,
639 (unsigned long)mp);
640
641 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
642 mdb->size++;
643
644 out:
645 return mp;
646 }
647
648 struct net_bridge_port_group *br_multicast_new_port_group(
649 struct net_bridge_port *port,
650 struct br_ip *group,
651 struct net_bridge_port_group __rcu *next,
652 unsigned char flags)
653 {
654 struct net_bridge_port_group *p;
655
656 p = kzalloc(sizeof(*p), GFP_ATOMIC);
657 if (unlikely(!p))
658 return NULL;
659
660 p->addr = *group;
661 p->port = port;
662 p->flags = flags;
663 rcu_assign_pointer(p->next, next);
664 hlist_add_head(&p->mglist, &port->mglist);
665 setup_timer(&p->timer, br_multicast_port_group_expired,
666 (unsigned long)p);
667 return p;
668 }
669
670 static int br_multicast_add_group(struct net_bridge *br,
671 struct net_bridge_port *port,
672 struct br_ip *group)
673 {
674 struct net_bridge_mdb_entry *mp;
675 struct net_bridge_port_group *p;
676 struct net_bridge_port_group __rcu **pp;
677 unsigned long now = jiffies;
678 int err;
679
680 spin_lock(&br->multicast_lock);
681 if (!netif_running(br->dev) ||
682 (port && port->state == BR_STATE_DISABLED))
683 goto out;
684
685 mp = br_multicast_new_group(br, port, group);
686 err = PTR_ERR(mp);
687 if (IS_ERR(mp))
688 goto err;
689
690 if (!port) {
691 mp->mglist = true;
692 mod_timer(&mp->timer, now + br->multicast_membership_interval);
693 goto out;
694 }
695
696 for (pp = &mp->ports;
697 (p = mlock_dereference(*pp, br)) != NULL;
698 pp = &p->next) {
699 if (p->port == port)
700 goto found;
701 if ((unsigned long)p->port < (unsigned long)port)
702 break;
703 }
704
705 p = br_multicast_new_port_group(port, group, *pp, 0);
706 if (unlikely(!p))
707 goto err;
708 rcu_assign_pointer(*pp, p);
709 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
710
711 found:
712 mod_timer(&p->timer, now + br->multicast_membership_interval);
713 out:
714 err = 0;
715
716 err:
717 spin_unlock(&br->multicast_lock);
718 return err;
719 }
720
721 static int br_ip4_multicast_add_group(struct net_bridge *br,
722 struct net_bridge_port *port,
723 __be32 group,
724 __u16 vid)
725 {
726 struct br_ip br_group;
727
728 if (ipv4_is_local_multicast(group))
729 return 0;
730
731 br_group.u.ip4 = group;
732 br_group.proto = htons(ETH_P_IP);
733 br_group.vid = vid;
734
735 return br_multicast_add_group(br, port, &br_group);
736 }
737
738 #if IS_ENABLED(CONFIG_IPV6)
739 static int br_ip6_multicast_add_group(struct net_bridge *br,
740 struct net_bridge_port *port,
741 const struct in6_addr *group,
742 __u16 vid)
743 {
744 struct br_ip br_group;
745
746 if (ipv6_addr_is_ll_all_nodes(group))
747 return 0;
748
749 br_group.u.ip6 = *group;
750 br_group.proto = htons(ETH_P_IPV6);
751 br_group.vid = vid;
752
753 return br_multicast_add_group(br, port, &br_group);
754 }
755 #endif
756
757 static void br_multicast_router_expired(unsigned long data)
758 {
759 struct net_bridge_port *port = (void *)data;
760 struct net_bridge *br = port->br;
761
762 spin_lock(&br->multicast_lock);
763 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
764 port->multicast_router == MDB_RTR_TYPE_PERM ||
765 timer_pending(&port->multicast_router_timer) ||
766 hlist_unhashed(&port->rlist))
767 goto out;
768
769 hlist_del_init_rcu(&port->rlist);
770 br_rtr_notify(br->dev, port, RTM_DELMDB);
771 /* Don't allow timer refresh if the router expired */
772 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
773 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
774
775 out:
776 spin_unlock(&br->multicast_lock);
777 }
778
779 static void br_multicast_local_router_expired(unsigned long data)
780 {
781 }
782
783 static void br_multicast_querier_expired(struct net_bridge *br,
784 struct bridge_mcast_own_query *query)
785 {
786 spin_lock(&br->multicast_lock);
787 if (!netif_running(br->dev) || br->multicast_disabled)
788 goto out;
789
790 br_multicast_start_querier(br, query);
791
792 out:
793 spin_unlock(&br->multicast_lock);
794 }
795
796 static void br_ip4_multicast_querier_expired(unsigned long data)
797 {
798 struct net_bridge *br = (void *)data;
799
800 br_multicast_querier_expired(br, &br->ip4_own_query);
801 }
802
803 #if IS_ENABLED(CONFIG_IPV6)
804 static void br_ip6_multicast_querier_expired(unsigned long data)
805 {
806 struct net_bridge *br = (void *)data;
807
808 br_multicast_querier_expired(br, &br->ip6_own_query);
809 }
810 #endif
811
812 static void br_multicast_select_own_querier(struct net_bridge *br,
813 struct br_ip *ip,
814 struct sk_buff *skb)
815 {
816 if (ip->proto == htons(ETH_P_IP))
817 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
818 #if IS_ENABLED(CONFIG_IPV6)
819 else
820 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
821 #endif
822 }
823
824 static void __br_multicast_send_query(struct net_bridge *br,
825 struct net_bridge_port *port,
826 struct br_ip *ip)
827 {
828 struct sk_buff *skb;
829
830 skb = br_multicast_alloc_query(br, ip);
831 if (!skb)
832 return;
833
834 if (port) {
835 skb->dev = port->dev;
836 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
837 dev_net(port->dev), NULL, skb, NULL, skb->dev,
838 br_dev_queue_push_xmit);
839 } else {
840 br_multicast_select_own_querier(br, ip, skb);
841 netif_rx(skb);
842 }
843 }
844
845 static void br_multicast_send_query(struct net_bridge *br,
846 struct net_bridge_port *port,
847 struct bridge_mcast_own_query *own_query)
848 {
849 unsigned long time;
850 struct br_ip br_group;
851 struct bridge_mcast_other_query *other_query = NULL;
852
853 if (!netif_running(br->dev) || br->multicast_disabled ||
854 !br->multicast_querier)
855 return;
856
857 memset(&br_group.u, 0, sizeof(br_group.u));
858
859 if (port ? (own_query == &port->ip4_own_query) :
860 (own_query == &br->ip4_own_query)) {
861 other_query = &br->ip4_other_query;
862 br_group.proto = htons(ETH_P_IP);
863 #if IS_ENABLED(CONFIG_IPV6)
864 } else {
865 other_query = &br->ip6_other_query;
866 br_group.proto = htons(ETH_P_IPV6);
867 #endif
868 }
869
870 if (!other_query || timer_pending(&other_query->timer))
871 return;
872
873 __br_multicast_send_query(br, port, &br_group);
874
875 time = jiffies;
876 time += own_query->startup_sent < br->multicast_startup_query_count ?
877 br->multicast_startup_query_interval :
878 br->multicast_query_interval;
879 mod_timer(&own_query->timer, time);
880 }
881
882 static void
883 br_multicast_port_query_expired(struct net_bridge_port *port,
884 struct bridge_mcast_own_query *query)
885 {
886 struct net_bridge *br = port->br;
887
888 spin_lock(&br->multicast_lock);
889 if (port->state == BR_STATE_DISABLED ||
890 port->state == BR_STATE_BLOCKING)
891 goto out;
892
893 if (query->startup_sent < br->multicast_startup_query_count)
894 query->startup_sent++;
895
896 br_multicast_send_query(port->br, port, query);
897
898 out:
899 spin_unlock(&br->multicast_lock);
900 }
901
902 static void br_ip4_multicast_port_query_expired(unsigned long data)
903 {
904 struct net_bridge_port *port = (void *)data;
905
906 br_multicast_port_query_expired(port, &port->ip4_own_query);
907 }
908
909 #if IS_ENABLED(CONFIG_IPV6)
910 static void br_ip6_multicast_port_query_expired(unsigned long data)
911 {
912 struct net_bridge_port *port = (void *)data;
913
914 br_multicast_port_query_expired(port, &port->ip6_own_query);
915 }
916 #endif
917
918 void br_multicast_add_port(struct net_bridge_port *port)
919 {
920 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
921
922 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
923 (unsigned long)port);
924 setup_timer(&port->ip4_own_query.timer,
925 br_ip4_multicast_port_query_expired, (unsigned long)port);
926 #if IS_ENABLED(CONFIG_IPV6)
927 setup_timer(&port->ip6_own_query.timer,
928 br_ip6_multicast_port_query_expired, (unsigned long)port);
929 #endif
930 }
931
932 void br_multicast_del_port(struct net_bridge_port *port)
933 {
934 struct net_bridge *br = port->br;
935 struct net_bridge_port_group *pg;
936 struct hlist_node *n;
937
938 /* Take care of the remaining groups, only perm ones should be left */
939 spin_lock_bh(&br->multicast_lock);
940 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
941 br_multicast_del_pg(br, pg);
942 spin_unlock_bh(&br->multicast_lock);
943 del_timer_sync(&port->multicast_router_timer);
944 }
945
946 static void br_multicast_enable(struct bridge_mcast_own_query *query)
947 {
948 query->startup_sent = 0;
949
950 if (try_to_del_timer_sync(&query->timer) >= 0 ||
951 del_timer(&query->timer))
952 mod_timer(&query->timer, jiffies);
953 }
954
955 void br_multicast_enable_port(struct net_bridge_port *port)
956 {
957 struct net_bridge *br = port->br;
958
959 spin_lock(&br->multicast_lock);
960 if (br->multicast_disabled || !netif_running(br->dev))
961 goto out;
962
963 br_multicast_enable(&port->ip4_own_query);
964 #if IS_ENABLED(CONFIG_IPV6)
965 br_multicast_enable(&port->ip6_own_query);
966 #endif
967 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
968 hlist_unhashed(&port->rlist))
969 br_multicast_add_router(br, port);
970
971 out:
972 spin_unlock(&br->multicast_lock);
973 }
974
975 void br_multicast_disable_port(struct net_bridge_port *port)
976 {
977 struct net_bridge *br = port->br;
978 struct net_bridge_port_group *pg;
979 struct hlist_node *n;
980
981 spin_lock(&br->multicast_lock);
982 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
983 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
984 br_multicast_del_pg(br, pg);
985
986 if (!hlist_unhashed(&port->rlist)) {
987 hlist_del_init_rcu(&port->rlist);
988 br_rtr_notify(br->dev, port, RTM_DELMDB);
989 /* Don't allow timer refresh if disabling */
990 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
991 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
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 == MDB_RTR_TYPE_TEMP_QUERY)
1240 mod_timer(&br->multicast_router_timer,
1241 now + br->multicast_querier_interval);
1242 return;
1243 }
1244
1245 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1246 port->multicast_router == MDB_RTR_TYPE_PERM)
1247 return;
1248
1249 br_multicast_add_router(br, port);
1250
1251 mod_timer(&port->multicast_router_timer,
1252 now + br->multicast_querier_interval);
1253 }
1254
1255 static void br_multicast_query_received(struct net_bridge *br,
1256 struct net_bridge_port *port,
1257 struct bridge_mcast_other_query *query,
1258 struct br_ip *saddr,
1259 unsigned long max_delay)
1260 {
1261 if (!br_multicast_select_querier(br, port, saddr))
1262 return;
1263
1264 br_multicast_update_query_timer(br, query, max_delay);
1265 br_multicast_mark_router(br, port);
1266 }
1267
1268 static int br_ip4_multicast_query(struct net_bridge *br,
1269 struct net_bridge_port *port,
1270 struct sk_buff *skb,
1271 u16 vid)
1272 {
1273 const struct iphdr *iph = ip_hdr(skb);
1274 struct igmphdr *ih = igmp_hdr(skb);
1275 struct net_bridge_mdb_entry *mp;
1276 struct igmpv3_query *ih3;
1277 struct net_bridge_port_group *p;
1278 struct net_bridge_port_group __rcu **pp;
1279 struct br_ip saddr;
1280 unsigned long max_delay;
1281 unsigned long now = jiffies;
1282 unsigned int offset = skb_transport_offset(skb);
1283 __be32 group;
1284 int err = 0;
1285
1286 spin_lock(&br->multicast_lock);
1287 if (!netif_running(br->dev) ||
1288 (port && port->state == BR_STATE_DISABLED))
1289 goto out;
1290
1291 group = ih->group;
1292
1293 if (skb->len == offset + sizeof(*ih)) {
1294 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1295
1296 if (!max_delay) {
1297 max_delay = 10 * HZ;
1298 group = 0;
1299 }
1300 } else if (skb->len >= offset + sizeof(*ih3)) {
1301 ih3 = igmpv3_query_hdr(skb);
1302 if (ih3->nsrcs)
1303 goto out;
1304
1305 max_delay = ih3->code ?
1306 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1307 } else {
1308 goto out;
1309 }
1310
1311 if (!group) {
1312 saddr.proto = htons(ETH_P_IP);
1313 saddr.u.ip4 = iph->saddr;
1314
1315 br_multicast_query_received(br, port, &br->ip4_other_query,
1316 &saddr, max_delay);
1317 goto out;
1318 }
1319
1320 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1321 if (!mp)
1322 goto out;
1323
1324 max_delay *= br->multicast_last_member_count;
1325
1326 if (mp->mglist &&
1327 (timer_pending(&mp->timer) ?
1328 time_after(mp->timer.expires, now + max_delay) :
1329 try_to_del_timer_sync(&mp->timer) >= 0))
1330 mod_timer(&mp->timer, now + max_delay);
1331
1332 for (pp = &mp->ports;
1333 (p = mlock_dereference(*pp, br)) != NULL;
1334 pp = &p->next) {
1335 if (timer_pending(&p->timer) ?
1336 time_after(p->timer.expires, now + max_delay) :
1337 try_to_del_timer_sync(&p->timer) >= 0)
1338 mod_timer(&p->timer, now + max_delay);
1339 }
1340
1341 out:
1342 spin_unlock(&br->multicast_lock);
1343 return err;
1344 }
1345
1346 #if IS_ENABLED(CONFIG_IPV6)
1347 static int br_ip6_multicast_query(struct net_bridge *br,
1348 struct net_bridge_port *port,
1349 struct sk_buff *skb,
1350 u16 vid)
1351 {
1352 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1353 struct mld_msg *mld;
1354 struct net_bridge_mdb_entry *mp;
1355 struct mld2_query *mld2q;
1356 struct net_bridge_port_group *p;
1357 struct net_bridge_port_group __rcu **pp;
1358 struct br_ip saddr;
1359 unsigned long max_delay;
1360 unsigned long now = jiffies;
1361 unsigned int offset = skb_transport_offset(skb);
1362 const struct in6_addr *group = NULL;
1363 bool is_general_query;
1364 int err = 0;
1365
1366 spin_lock(&br->multicast_lock);
1367 if (!netif_running(br->dev) ||
1368 (port && port->state == BR_STATE_DISABLED))
1369 goto out;
1370
1371 if (skb->len == offset + sizeof(*mld)) {
1372 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1373 err = -EINVAL;
1374 goto out;
1375 }
1376 mld = (struct mld_msg *) icmp6_hdr(skb);
1377 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1378 if (max_delay)
1379 group = &mld->mld_mca;
1380 } else {
1381 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1382 err = -EINVAL;
1383 goto out;
1384 }
1385 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1386 if (!mld2q->mld2q_nsrcs)
1387 group = &mld2q->mld2q_mca;
1388
1389 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1390 }
1391
1392 is_general_query = group && ipv6_addr_any(group);
1393
1394 if (is_general_query) {
1395 saddr.proto = htons(ETH_P_IPV6);
1396 saddr.u.ip6 = ip6h->saddr;
1397
1398 br_multicast_query_received(br, port, &br->ip6_other_query,
1399 &saddr, max_delay);
1400 goto out;
1401 } else if (!group) {
1402 goto out;
1403 }
1404
1405 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1406 if (!mp)
1407 goto out;
1408
1409 max_delay *= br->multicast_last_member_count;
1410 if (mp->mglist &&
1411 (timer_pending(&mp->timer) ?
1412 time_after(mp->timer.expires, now + max_delay) :
1413 try_to_del_timer_sync(&mp->timer) >= 0))
1414 mod_timer(&mp->timer, now + max_delay);
1415
1416 for (pp = &mp->ports;
1417 (p = mlock_dereference(*pp, br)) != NULL;
1418 pp = &p->next) {
1419 if (timer_pending(&p->timer) ?
1420 time_after(p->timer.expires, now + max_delay) :
1421 try_to_del_timer_sync(&p->timer) >= 0)
1422 mod_timer(&p->timer, now + max_delay);
1423 }
1424
1425 out:
1426 spin_unlock(&br->multicast_lock);
1427 return err;
1428 }
1429 #endif
1430
1431 static void
1432 br_multicast_leave_group(struct net_bridge *br,
1433 struct net_bridge_port *port,
1434 struct br_ip *group,
1435 struct bridge_mcast_other_query *other_query,
1436 struct bridge_mcast_own_query *own_query)
1437 {
1438 struct net_bridge_mdb_htable *mdb;
1439 struct net_bridge_mdb_entry *mp;
1440 struct net_bridge_port_group *p;
1441 unsigned long now;
1442 unsigned long time;
1443
1444 spin_lock(&br->multicast_lock);
1445 if (!netif_running(br->dev) ||
1446 (port && port->state == BR_STATE_DISABLED))
1447 goto out;
1448
1449 mdb = mlock_dereference(br->mdb, br);
1450 mp = br_mdb_ip_get(mdb, group);
1451 if (!mp)
1452 goto out;
1453
1454 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1455 struct net_bridge_port_group __rcu **pp;
1456
1457 for (pp = &mp->ports;
1458 (p = mlock_dereference(*pp, br)) != NULL;
1459 pp = &p->next) {
1460 if (p->port != port)
1461 continue;
1462
1463 rcu_assign_pointer(*pp, p->next);
1464 hlist_del_init(&p->mglist);
1465 del_timer(&p->timer);
1466 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1467 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1468 p->flags);
1469
1470 if (!mp->ports && !mp->mglist &&
1471 netif_running(br->dev))
1472 mod_timer(&mp->timer, jiffies);
1473 }
1474 goto out;
1475 }
1476
1477 if (timer_pending(&other_query->timer))
1478 goto out;
1479
1480 if (br->multicast_querier) {
1481 __br_multicast_send_query(br, port, &mp->addr);
1482
1483 time = jiffies + br->multicast_last_member_count *
1484 br->multicast_last_member_interval;
1485
1486 mod_timer(&own_query->timer, time);
1487
1488 for (p = mlock_dereference(mp->ports, br);
1489 p != NULL;
1490 p = mlock_dereference(p->next, br)) {
1491 if (p->port != port)
1492 continue;
1493
1494 if (!hlist_unhashed(&p->mglist) &&
1495 (timer_pending(&p->timer) ?
1496 time_after(p->timer.expires, time) :
1497 try_to_del_timer_sync(&p->timer) >= 0)) {
1498 mod_timer(&p->timer, time);
1499 }
1500
1501 break;
1502 }
1503 }
1504
1505 now = jiffies;
1506 time = now + br->multicast_last_member_count *
1507 br->multicast_last_member_interval;
1508
1509 if (!port) {
1510 if (mp->mglist &&
1511 (timer_pending(&mp->timer) ?
1512 time_after(mp->timer.expires, time) :
1513 try_to_del_timer_sync(&mp->timer) >= 0)) {
1514 mod_timer(&mp->timer, time);
1515 }
1516
1517 goto out;
1518 }
1519
1520 for (p = mlock_dereference(mp->ports, br);
1521 p != NULL;
1522 p = mlock_dereference(p->next, br)) {
1523 if (p->port != port)
1524 continue;
1525
1526 if (!hlist_unhashed(&p->mglist) &&
1527 (timer_pending(&p->timer) ?
1528 time_after(p->timer.expires, time) :
1529 try_to_del_timer_sync(&p->timer) >= 0)) {
1530 mod_timer(&p->timer, time);
1531 }
1532
1533 break;
1534 }
1535 out:
1536 spin_unlock(&br->multicast_lock);
1537 }
1538
1539 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1540 struct net_bridge_port *port,
1541 __be32 group,
1542 __u16 vid)
1543 {
1544 struct br_ip br_group;
1545 struct bridge_mcast_own_query *own_query;
1546
1547 if (ipv4_is_local_multicast(group))
1548 return;
1549
1550 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1551
1552 br_group.u.ip4 = group;
1553 br_group.proto = htons(ETH_P_IP);
1554 br_group.vid = vid;
1555
1556 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1557 own_query);
1558 }
1559
1560 #if IS_ENABLED(CONFIG_IPV6)
1561 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1562 struct net_bridge_port *port,
1563 const struct in6_addr *group,
1564 __u16 vid)
1565 {
1566 struct br_ip br_group;
1567 struct bridge_mcast_own_query *own_query;
1568
1569 if (ipv6_addr_is_ll_all_nodes(group))
1570 return;
1571
1572 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1573
1574 br_group.u.ip6 = *group;
1575 br_group.proto = htons(ETH_P_IPV6);
1576 br_group.vid = vid;
1577
1578 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1579 own_query);
1580 }
1581 #endif
1582
1583 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1584 struct net_bridge_port *port,
1585 struct sk_buff *skb,
1586 u16 vid)
1587 {
1588 struct sk_buff *skb_trimmed = NULL;
1589 struct igmphdr *ih;
1590 int err;
1591
1592 err = ip_mc_check_igmp(skb, &skb_trimmed);
1593
1594 if (err == -ENOMSG) {
1595 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1596 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1597 return 0;
1598 } else if (err < 0) {
1599 return err;
1600 }
1601
1602 BR_INPUT_SKB_CB(skb)->igmp = 1;
1603 ih = igmp_hdr(skb);
1604
1605 switch (ih->type) {
1606 case IGMP_HOST_MEMBERSHIP_REPORT:
1607 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1608 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1609 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1610 break;
1611 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1612 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1613 break;
1614 case IGMP_HOST_MEMBERSHIP_QUERY:
1615 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1616 break;
1617 case IGMP_HOST_LEAVE_MESSAGE:
1618 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1619 break;
1620 }
1621
1622 if (skb_trimmed && skb_trimmed != skb)
1623 kfree_skb(skb_trimmed);
1624
1625 return err;
1626 }
1627
1628 #if IS_ENABLED(CONFIG_IPV6)
1629 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1630 struct net_bridge_port *port,
1631 struct sk_buff *skb,
1632 u16 vid)
1633 {
1634 struct sk_buff *skb_trimmed = NULL;
1635 struct mld_msg *mld;
1636 int err;
1637
1638 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1639
1640 if (err == -ENOMSG) {
1641 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1642 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1643 return 0;
1644 } else if (err < 0) {
1645 return err;
1646 }
1647
1648 BR_INPUT_SKB_CB(skb)->igmp = 1;
1649 mld = (struct mld_msg *)skb_transport_header(skb);
1650
1651 switch (mld->mld_type) {
1652 case ICMPV6_MGM_REPORT:
1653 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1654 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1655 break;
1656 case ICMPV6_MLD2_REPORT:
1657 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1658 break;
1659 case ICMPV6_MGM_QUERY:
1660 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1661 break;
1662 case ICMPV6_MGM_REDUCTION:
1663 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1664 break;
1665 }
1666
1667 if (skb_trimmed && skb_trimmed != skb)
1668 kfree_skb(skb_trimmed);
1669
1670 return err;
1671 }
1672 #endif
1673
1674 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1675 struct sk_buff *skb, u16 vid)
1676 {
1677 BR_INPUT_SKB_CB(skb)->igmp = 0;
1678 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1679
1680 if (br->multicast_disabled)
1681 return 0;
1682
1683 switch (skb->protocol) {
1684 case htons(ETH_P_IP):
1685 return br_multicast_ipv4_rcv(br, port, skb, vid);
1686 #if IS_ENABLED(CONFIG_IPV6)
1687 case htons(ETH_P_IPV6):
1688 return br_multicast_ipv6_rcv(br, port, skb, vid);
1689 #endif
1690 }
1691
1692 return 0;
1693 }
1694
1695 static void br_multicast_query_expired(struct net_bridge *br,
1696 struct bridge_mcast_own_query *query,
1697 struct bridge_mcast_querier *querier)
1698 {
1699 spin_lock(&br->multicast_lock);
1700 if (query->startup_sent < br->multicast_startup_query_count)
1701 query->startup_sent++;
1702
1703 RCU_INIT_POINTER(querier->port, NULL);
1704 br_multicast_send_query(br, NULL, query);
1705 spin_unlock(&br->multicast_lock);
1706 }
1707
1708 static void br_ip4_multicast_query_expired(unsigned long data)
1709 {
1710 struct net_bridge *br = (void *)data;
1711
1712 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1713 }
1714
1715 #if IS_ENABLED(CONFIG_IPV6)
1716 static void br_ip6_multicast_query_expired(unsigned long data)
1717 {
1718 struct net_bridge *br = (void *)data;
1719
1720 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1721 }
1722 #endif
1723
1724 void br_multicast_init(struct net_bridge *br)
1725 {
1726 br->hash_elasticity = 4;
1727 br->hash_max = 512;
1728
1729 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1730 br->multicast_querier = 0;
1731 br->multicast_query_use_ifaddr = 0;
1732 br->multicast_last_member_count = 2;
1733 br->multicast_startup_query_count = 2;
1734
1735 br->multicast_last_member_interval = HZ;
1736 br->multicast_query_response_interval = 10 * HZ;
1737 br->multicast_startup_query_interval = 125 * HZ / 4;
1738 br->multicast_query_interval = 125 * HZ;
1739 br->multicast_querier_interval = 255 * HZ;
1740 br->multicast_membership_interval = 260 * HZ;
1741
1742 br->ip4_other_query.delay_time = 0;
1743 br->ip4_querier.port = NULL;
1744 #if IS_ENABLED(CONFIG_IPV6)
1745 br->ip6_other_query.delay_time = 0;
1746 br->ip6_querier.port = NULL;
1747 #endif
1748
1749 spin_lock_init(&br->multicast_lock);
1750 setup_timer(&br->multicast_router_timer,
1751 br_multicast_local_router_expired, 0);
1752 setup_timer(&br->ip4_other_query.timer,
1753 br_ip4_multicast_querier_expired, (unsigned long)br);
1754 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1755 (unsigned long)br);
1756 #if IS_ENABLED(CONFIG_IPV6)
1757 setup_timer(&br->ip6_other_query.timer,
1758 br_ip6_multicast_querier_expired, (unsigned long)br);
1759 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1760 (unsigned long)br);
1761 #endif
1762 }
1763
1764 static void __br_multicast_open(struct net_bridge *br,
1765 struct bridge_mcast_own_query *query)
1766 {
1767 query->startup_sent = 0;
1768
1769 if (br->multicast_disabled)
1770 return;
1771
1772 mod_timer(&query->timer, jiffies);
1773 }
1774
1775 void br_multicast_open(struct net_bridge *br)
1776 {
1777 __br_multicast_open(br, &br->ip4_own_query);
1778 #if IS_ENABLED(CONFIG_IPV6)
1779 __br_multicast_open(br, &br->ip6_own_query);
1780 #endif
1781 }
1782
1783 void br_multicast_stop(struct net_bridge *br)
1784 {
1785 del_timer_sync(&br->multicast_router_timer);
1786 del_timer_sync(&br->ip4_other_query.timer);
1787 del_timer_sync(&br->ip4_own_query.timer);
1788 #if IS_ENABLED(CONFIG_IPV6)
1789 del_timer_sync(&br->ip6_other_query.timer);
1790 del_timer_sync(&br->ip6_own_query.timer);
1791 #endif
1792 }
1793
1794 void br_multicast_dev_del(struct net_bridge *br)
1795 {
1796 struct net_bridge_mdb_htable *mdb;
1797 struct net_bridge_mdb_entry *mp;
1798 struct hlist_node *n;
1799 u32 ver;
1800 int i;
1801
1802 spin_lock_bh(&br->multicast_lock);
1803 mdb = mlock_dereference(br->mdb, br);
1804 if (!mdb)
1805 goto out;
1806
1807 br->mdb = NULL;
1808
1809 ver = mdb->ver;
1810 for (i = 0; i < mdb->max; i++) {
1811 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1812 hlist[ver]) {
1813 del_timer(&mp->timer);
1814 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1815 }
1816 }
1817
1818 if (mdb->old) {
1819 spin_unlock_bh(&br->multicast_lock);
1820 rcu_barrier_bh();
1821 spin_lock_bh(&br->multicast_lock);
1822 WARN_ON(mdb->old);
1823 }
1824
1825 mdb->old = mdb;
1826 call_rcu_bh(&mdb->rcu, br_mdb_free);
1827
1828 out:
1829 spin_unlock_bh(&br->multicast_lock);
1830 }
1831
1832 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1833 {
1834 int err = -EINVAL;
1835
1836 spin_lock_bh(&br->multicast_lock);
1837
1838 switch (val) {
1839 case MDB_RTR_TYPE_DISABLED:
1840 case MDB_RTR_TYPE_PERM:
1841 del_timer(&br->multicast_router_timer);
1842 /* fall through */
1843 case MDB_RTR_TYPE_TEMP_QUERY:
1844 br->multicast_router = val;
1845 err = 0;
1846 break;
1847 }
1848
1849 spin_unlock_bh(&br->multicast_lock);
1850
1851 return err;
1852 }
1853
1854 static void __del_port_router(struct net_bridge_port *p)
1855 {
1856 if (hlist_unhashed(&p->rlist))
1857 return;
1858 hlist_del_init_rcu(&p->rlist);
1859 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1860 }
1861
1862 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1863 {
1864 struct net_bridge *br = p->br;
1865 unsigned long now = jiffies;
1866 int err = -EINVAL;
1867
1868 spin_lock(&br->multicast_lock);
1869 if (p->multicast_router == val) {
1870 /* Refresh the temp router port timer */
1871 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1872 mod_timer(&p->multicast_router_timer,
1873 now + br->multicast_querier_interval);
1874 err = 0;
1875 goto unlock;
1876 }
1877 switch (val) {
1878 case MDB_RTR_TYPE_DISABLED:
1879 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1880 __del_port_router(p);
1881 del_timer(&p->multicast_router_timer);
1882 break;
1883 case MDB_RTR_TYPE_TEMP_QUERY:
1884 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1885 __del_port_router(p);
1886 break;
1887 case MDB_RTR_TYPE_PERM:
1888 p->multicast_router = MDB_RTR_TYPE_PERM;
1889 del_timer(&p->multicast_router_timer);
1890 br_multicast_add_router(br, p);
1891 break;
1892 case MDB_RTR_TYPE_TEMP:
1893 p->multicast_router = MDB_RTR_TYPE_TEMP;
1894 br_multicast_mark_router(br, p);
1895 break;
1896 default:
1897 goto unlock;
1898 }
1899 err = 0;
1900 unlock:
1901 spin_unlock(&br->multicast_lock);
1902
1903 return err;
1904 }
1905
1906 static void br_multicast_start_querier(struct net_bridge *br,
1907 struct bridge_mcast_own_query *query)
1908 {
1909 struct net_bridge_port *port;
1910
1911 __br_multicast_open(br, query);
1912
1913 list_for_each_entry(port, &br->port_list, list) {
1914 if (port->state == BR_STATE_DISABLED ||
1915 port->state == BR_STATE_BLOCKING)
1916 continue;
1917
1918 if (query == &br->ip4_own_query)
1919 br_multicast_enable(&port->ip4_own_query);
1920 #if IS_ENABLED(CONFIG_IPV6)
1921 else
1922 br_multicast_enable(&port->ip6_own_query);
1923 #endif
1924 }
1925 }
1926
1927 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1928 {
1929 int err = 0;
1930 struct net_bridge_mdb_htable *mdb;
1931
1932 spin_lock_bh(&br->multicast_lock);
1933 if (br->multicast_disabled == !val)
1934 goto unlock;
1935
1936 br->multicast_disabled = !val;
1937 if (br->multicast_disabled)
1938 goto unlock;
1939
1940 if (!netif_running(br->dev))
1941 goto unlock;
1942
1943 mdb = mlock_dereference(br->mdb, br);
1944 if (mdb) {
1945 if (mdb->old) {
1946 err = -EEXIST;
1947 rollback:
1948 br->multicast_disabled = !!val;
1949 goto unlock;
1950 }
1951
1952 err = br_mdb_rehash(&br->mdb, mdb->max,
1953 br->hash_elasticity);
1954 if (err)
1955 goto rollback;
1956 }
1957
1958 br_multicast_start_querier(br, &br->ip4_own_query);
1959 #if IS_ENABLED(CONFIG_IPV6)
1960 br_multicast_start_querier(br, &br->ip6_own_query);
1961 #endif
1962
1963 unlock:
1964 spin_unlock_bh(&br->multicast_lock);
1965
1966 return err;
1967 }
1968
1969 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1970 {
1971 unsigned long max_delay;
1972
1973 val = !!val;
1974
1975 spin_lock_bh(&br->multicast_lock);
1976 if (br->multicast_querier == val)
1977 goto unlock;
1978
1979 br->multicast_querier = val;
1980 if (!val)
1981 goto unlock;
1982
1983 max_delay = br->multicast_query_response_interval;
1984
1985 if (!timer_pending(&br->ip4_other_query.timer))
1986 br->ip4_other_query.delay_time = jiffies + max_delay;
1987
1988 br_multicast_start_querier(br, &br->ip4_own_query);
1989
1990 #if IS_ENABLED(CONFIG_IPV6)
1991 if (!timer_pending(&br->ip6_other_query.timer))
1992 br->ip6_other_query.delay_time = jiffies + max_delay;
1993
1994 br_multicast_start_querier(br, &br->ip6_own_query);
1995 #endif
1996
1997 unlock:
1998 spin_unlock_bh(&br->multicast_lock);
1999
2000 return 0;
2001 }
2002
2003 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2004 {
2005 int err = -EINVAL;
2006 u32 old;
2007 struct net_bridge_mdb_htable *mdb;
2008
2009 spin_lock_bh(&br->multicast_lock);
2010 if (!is_power_of_2(val))
2011 goto unlock;
2012
2013 mdb = mlock_dereference(br->mdb, br);
2014 if (mdb && val < mdb->size)
2015 goto unlock;
2016
2017 err = 0;
2018
2019 old = br->hash_max;
2020 br->hash_max = val;
2021
2022 if (mdb) {
2023 if (mdb->old) {
2024 err = -EEXIST;
2025 rollback:
2026 br->hash_max = old;
2027 goto unlock;
2028 }
2029
2030 err = br_mdb_rehash(&br->mdb, br->hash_max,
2031 br->hash_elasticity);
2032 if (err)
2033 goto rollback;
2034 }
2035
2036 unlock:
2037 spin_unlock_bh(&br->multicast_lock);
2038
2039 return err;
2040 }
2041
2042 /**
2043 * br_multicast_list_adjacent - Returns snooped multicast addresses
2044 * @dev: The bridge port adjacent to which to retrieve addresses
2045 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2046 *
2047 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2048 * snooping feature on all bridge ports of dev's bridge device, excluding
2049 * the addresses from dev itself.
2050 *
2051 * Returns the number of items added to br_ip_list.
2052 *
2053 * Notes:
2054 * - br_ip_list needs to be initialized by caller
2055 * - br_ip_list might contain duplicates in the end
2056 * (needs to be taken care of by caller)
2057 * - br_ip_list needs to be freed by caller
2058 */
2059 int br_multicast_list_adjacent(struct net_device *dev,
2060 struct list_head *br_ip_list)
2061 {
2062 struct net_bridge *br;
2063 struct net_bridge_port *port;
2064 struct net_bridge_port_group *group;
2065 struct br_ip_list *entry;
2066 int count = 0;
2067
2068 rcu_read_lock();
2069 if (!br_ip_list || !br_port_exists(dev))
2070 goto unlock;
2071
2072 port = br_port_get_rcu(dev);
2073 if (!port || !port->br)
2074 goto unlock;
2075
2076 br = port->br;
2077
2078 list_for_each_entry_rcu(port, &br->port_list, list) {
2079 if (!port->dev || port->dev == dev)
2080 continue;
2081
2082 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2083 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2084 if (!entry)
2085 goto unlock;
2086
2087 entry->addr = group->addr;
2088 list_add(&entry->list, br_ip_list);
2089 count++;
2090 }
2091 }
2092
2093 unlock:
2094 rcu_read_unlock();
2095 return count;
2096 }
2097 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2098
2099 /**
2100 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2101 * @dev: The bridge port providing the bridge on which to check for a querier
2102 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2103 *
2104 * Checks whether the given interface has a bridge on top and if so returns
2105 * true if a valid querier exists anywhere on the bridged link layer.
2106 * Otherwise returns false.
2107 */
2108 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2109 {
2110 struct net_bridge *br;
2111 struct net_bridge_port *port;
2112 struct ethhdr eth;
2113 bool ret = false;
2114
2115 rcu_read_lock();
2116 if (!br_port_exists(dev))
2117 goto unlock;
2118
2119 port = br_port_get_rcu(dev);
2120 if (!port || !port->br)
2121 goto unlock;
2122
2123 br = port->br;
2124
2125 memset(&eth, 0, sizeof(eth));
2126 eth.h_proto = htons(proto);
2127
2128 ret = br_multicast_querier_exists(br, &eth);
2129
2130 unlock:
2131 rcu_read_unlock();
2132 return ret;
2133 }
2134 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2135
2136 /**
2137 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2138 * @dev: The bridge port adjacent to which to check for a querier
2139 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2140 *
2141 * Checks whether the given interface has a bridge on top and if so returns
2142 * true if a selected querier is behind one of the other ports of this
2143 * bridge. Otherwise returns false.
2144 */
2145 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2146 {
2147 struct net_bridge *br;
2148 struct net_bridge_port *port;
2149 bool ret = false;
2150
2151 rcu_read_lock();
2152 if (!br_port_exists(dev))
2153 goto unlock;
2154
2155 port = br_port_get_rcu(dev);
2156 if (!port || !port->br)
2157 goto unlock;
2158
2159 br = port->br;
2160
2161 switch (proto) {
2162 case ETH_P_IP:
2163 if (!timer_pending(&br->ip4_other_query.timer) ||
2164 rcu_dereference(br->ip4_querier.port) == port)
2165 goto unlock;
2166 break;
2167 #if IS_ENABLED(CONFIG_IPV6)
2168 case ETH_P_IPV6:
2169 if (!timer_pending(&br->ip6_other_query.timer) ||
2170 rcu_dereference(br->ip6_querier.port) == port)
2171 goto unlock;
2172 break;
2173 #endif
2174 default:
2175 goto unlock;
2176 }
2177
2178 ret = true;
2179 unlock:
2180 rcu_read_unlock();
2181 return ret;
2182 }
2183 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
Linux kernel - Deliverables
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