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Merge branch 'for-4.8/drivers' of git://git.kernel.dk/linux-block
[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 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 flags)
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->flags = flags;
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, 0);
709 if (unlikely(!p))
710 goto err;
711 rcu_assign_pointer(*pp, p);
712 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
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 == MDB_RTR_TYPE_DISABLED ||
767 port->multicast_router == MDB_RTR_TYPE_PERM ||
768 timer_pending(&port->multicast_router_timer) ||
769 hlist_unhashed(&port->rlist))
770 goto out;
771
772 hlist_del_init_rcu(&port->rlist);
773 br_rtr_notify(br->dev, port, RTM_DELMDB);
774 /* Don't allow timer refresh if the router expired */
775 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
776 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
777
778 out:
779 spin_unlock(&br->multicast_lock);
780 }
781
782 static void br_multicast_local_router_expired(unsigned long data)
783 {
784 }
785
786 static void br_multicast_querier_expired(struct net_bridge *br,
787 struct bridge_mcast_own_query *query)
788 {
789 spin_lock(&br->multicast_lock);
790 if (!netif_running(br->dev) || br->multicast_disabled)
791 goto out;
792
793 br_multicast_start_querier(br, query);
794
795 out:
796 spin_unlock(&br->multicast_lock);
797 }
798
799 static void br_ip4_multicast_querier_expired(unsigned long data)
800 {
801 struct net_bridge *br = (void *)data;
802
803 br_multicast_querier_expired(br, &br->ip4_own_query);
804 }
805
806 #if IS_ENABLED(CONFIG_IPV6)
807 static void br_ip6_multicast_querier_expired(unsigned long data)
808 {
809 struct net_bridge *br = (void *)data;
810
811 br_multicast_querier_expired(br, &br->ip6_own_query);
812 }
813 #endif
814
815 static void br_multicast_select_own_querier(struct net_bridge *br,
816 struct br_ip *ip,
817 struct sk_buff *skb)
818 {
819 if (ip->proto == htons(ETH_P_IP))
820 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
821 #if IS_ENABLED(CONFIG_IPV6)
822 else
823 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
824 #endif
825 }
826
827 static void __br_multicast_send_query(struct net_bridge *br,
828 struct net_bridge_port *port,
829 struct br_ip *ip)
830 {
831 struct sk_buff *skb;
832
833 skb = br_multicast_alloc_query(br, ip);
834 if (!skb)
835 return;
836
837 if (port) {
838 skb->dev = port->dev;
839 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
840 dev_net(port->dev), NULL, skb, NULL, skb->dev,
841 br_dev_queue_push_xmit);
842 } else {
843 br_multicast_select_own_querier(br, ip, skb);
844 netif_rx(skb);
845 }
846 }
847
848 static void br_multicast_send_query(struct net_bridge *br,
849 struct net_bridge_port *port,
850 struct bridge_mcast_own_query *own_query)
851 {
852 unsigned long time;
853 struct br_ip br_group;
854 struct bridge_mcast_other_query *other_query = NULL;
855
856 if (!netif_running(br->dev) || br->multicast_disabled ||
857 !br->multicast_querier)
858 return;
859
860 memset(&br_group.u, 0, sizeof(br_group.u));
861
862 if (port ? (own_query == &port->ip4_own_query) :
863 (own_query == &br->ip4_own_query)) {
864 other_query = &br->ip4_other_query;
865 br_group.proto = htons(ETH_P_IP);
866 #if IS_ENABLED(CONFIG_IPV6)
867 } else {
868 other_query = &br->ip6_other_query;
869 br_group.proto = htons(ETH_P_IPV6);
870 #endif
871 }
872
873 if (!other_query || timer_pending(&other_query->timer))
874 return;
875
876 __br_multicast_send_query(br, port, &br_group);
877
878 time = jiffies;
879 time += own_query->startup_sent < br->multicast_startup_query_count ?
880 br->multicast_startup_query_interval :
881 br->multicast_query_interval;
882 mod_timer(&own_query->timer, time);
883 }
884
885 static void
886 br_multicast_port_query_expired(struct net_bridge_port *port,
887 struct bridge_mcast_own_query *query)
888 {
889 struct net_bridge *br = port->br;
890
891 spin_lock(&br->multicast_lock);
892 if (port->state == BR_STATE_DISABLED ||
893 port->state == BR_STATE_BLOCKING)
894 goto out;
895
896 if (query->startup_sent < br->multicast_startup_query_count)
897 query->startup_sent++;
898
899 br_multicast_send_query(port->br, port, query);
900
901 out:
902 spin_unlock(&br->multicast_lock);
903 }
904
905 static void br_ip4_multicast_port_query_expired(unsigned long data)
906 {
907 struct net_bridge_port *port = (void *)data;
908
909 br_multicast_port_query_expired(port, &port->ip4_own_query);
910 }
911
912 #if IS_ENABLED(CONFIG_IPV6)
913 static void br_ip6_multicast_port_query_expired(unsigned long data)
914 {
915 struct net_bridge_port *port = (void *)data;
916
917 br_multicast_port_query_expired(port, &port->ip6_own_query);
918 }
919 #endif
920
921 void br_multicast_add_port(struct net_bridge_port *port)
922 {
923 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
924
925 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
926 (unsigned long)port);
927 setup_timer(&port->ip4_own_query.timer,
928 br_ip4_multicast_port_query_expired, (unsigned long)port);
929 #if IS_ENABLED(CONFIG_IPV6)
930 setup_timer(&port->ip6_own_query.timer,
931 br_ip6_multicast_port_query_expired, (unsigned long)port);
932 #endif
933 }
934
935 void br_multicast_del_port(struct net_bridge_port *port)
936 {
937 struct net_bridge *br = port->br;
938 struct net_bridge_port_group *pg;
939 struct hlist_node *n;
940
941 /* Take care of the remaining groups, only perm ones should be left */
942 spin_lock_bh(&br->multicast_lock);
943 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
944 br_multicast_del_pg(br, pg);
945 spin_unlock_bh(&br->multicast_lock);
946 del_timer_sync(&port->multicast_router_timer);
947 }
948
949 static void br_multicast_enable(struct bridge_mcast_own_query *query)
950 {
951 query->startup_sent = 0;
952
953 if (try_to_del_timer_sync(&query->timer) >= 0 ||
954 del_timer(&query->timer))
955 mod_timer(&query->timer, jiffies);
956 }
957
958 void br_multicast_enable_port(struct net_bridge_port *port)
959 {
960 struct net_bridge *br = port->br;
961
962 spin_lock(&br->multicast_lock);
963 if (br->multicast_disabled || !netif_running(br->dev))
964 goto out;
965
966 br_multicast_enable(&port->ip4_own_query);
967 #if IS_ENABLED(CONFIG_IPV6)
968 br_multicast_enable(&port->ip6_own_query);
969 #endif
970 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
971 hlist_unhashed(&port->rlist))
972 br_multicast_add_router(br, port);
973
974 out:
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->flags & MDB_PG_FLAGS_PERMANENT))
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 /* Don't allow timer refresh if disabling */
993 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
994 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
995 }
996 del_timer(&port->multicast_router_timer);
997 del_timer(&port->ip4_own_query.timer);
998 #if IS_ENABLED(CONFIG_IPV6)
999 del_timer(&port->ip6_own_query.timer);
1000 #endif
1001 spin_unlock(&br->multicast_lock);
1002 }
1003
1004 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1005 struct net_bridge_port *port,
1006 struct sk_buff *skb,
1007 u16 vid)
1008 {
1009 struct igmpv3_report *ih;
1010 struct igmpv3_grec *grec;
1011 int i;
1012 int len;
1013 int num;
1014 int type;
1015 int err = 0;
1016 __be32 group;
1017
1018 ih = igmpv3_report_hdr(skb);
1019 num = ntohs(ih->ngrec);
1020 len = skb_transport_offset(skb) + sizeof(*ih);
1021
1022 for (i = 0; i < num; i++) {
1023 len += sizeof(*grec);
1024 if (!pskb_may_pull(skb, len))
1025 return -EINVAL;
1026
1027 grec = (void *)(skb->data + len - sizeof(*grec));
1028 group = grec->grec_mca;
1029 type = grec->grec_type;
1030
1031 len += ntohs(grec->grec_nsrcs) * 4;
1032 if (!pskb_may_pull(skb, len))
1033 return -EINVAL;
1034
1035 /* We treat this as an IGMPv2 report for now. */
1036 switch (type) {
1037 case IGMPV3_MODE_IS_INCLUDE:
1038 case IGMPV3_MODE_IS_EXCLUDE:
1039 case IGMPV3_CHANGE_TO_INCLUDE:
1040 case IGMPV3_CHANGE_TO_EXCLUDE:
1041 case IGMPV3_ALLOW_NEW_SOURCES:
1042 case IGMPV3_BLOCK_OLD_SOURCES:
1043 break;
1044
1045 default:
1046 continue;
1047 }
1048
1049 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1050 type == IGMPV3_MODE_IS_INCLUDE) &&
1051 ntohs(grec->grec_nsrcs) == 0) {
1052 br_ip4_multicast_leave_group(br, port, group, vid);
1053 } else {
1054 err = br_ip4_multicast_add_group(br, port, group, vid);
1055 if (err)
1056 break;
1057 }
1058 }
1059
1060 return err;
1061 }
1062
1063 #if IS_ENABLED(CONFIG_IPV6)
1064 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1065 struct net_bridge_port *port,
1066 struct sk_buff *skb,
1067 u16 vid)
1068 {
1069 struct icmp6hdr *icmp6h;
1070 struct mld2_grec *grec;
1071 int i;
1072 int len;
1073 int num;
1074 int err = 0;
1075
1076 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1077 return -EINVAL;
1078
1079 icmp6h = icmp6_hdr(skb);
1080 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1081 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1082
1083 for (i = 0; i < num; i++) {
1084 __be16 *nsrcs, _nsrcs;
1085
1086 nsrcs = skb_header_pointer(skb,
1087 len + offsetof(struct mld2_grec,
1088 grec_nsrcs),
1089 sizeof(_nsrcs), &_nsrcs);
1090 if (!nsrcs)
1091 return -EINVAL;
1092
1093 if (!pskb_may_pull(skb,
1094 len + sizeof(*grec) +
1095 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1096 return -EINVAL;
1097
1098 grec = (struct mld2_grec *)(skb->data + len);
1099 len += sizeof(*grec) +
1100 sizeof(struct in6_addr) * ntohs(*nsrcs);
1101
1102 /* We treat these as MLDv1 reports for now. */
1103 switch (grec->grec_type) {
1104 case MLD2_MODE_IS_INCLUDE:
1105 case MLD2_MODE_IS_EXCLUDE:
1106 case MLD2_CHANGE_TO_INCLUDE:
1107 case MLD2_CHANGE_TO_EXCLUDE:
1108 case MLD2_ALLOW_NEW_SOURCES:
1109 case MLD2_BLOCK_OLD_SOURCES:
1110 break;
1111
1112 default:
1113 continue;
1114 }
1115
1116 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1117 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1118 ntohs(*nsrcs) == 0) {
1119 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1120 vid);
1121 } else {
1122 err = br_ip6_multicast_add_group(br, port,
1123 &grec->grec_mca, vid);
1124 if (!err)
1125 break;
1126 }
1127 }
1128
1129 return err;
1130 }
1131 #endif
1132
1133 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1134 struct net_bridge_port *port,
1135 __be32 saddr)
1136 {
1137 if (!timer_pending(&br->ip4_own_query.timer) &&
1138 !timer_pending(&br->ip4_other_query.timer))
1139 goto update;
1140
1141 if (!br->ip4_querier.addr.u.ip4)
1142 goto update;
1143
1144 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1145 goto update;
1146
1147 return false;
1148
1149 update:
1150 br->ip4_querier.addr.u.ip4 = saddr;
1151
1152 /* update protected by general multicast_lock by caller */
1153 rcu_assign_pointer(br->ip4_querier.port, port);
1154
1155 return true;
1156 }
1157
1158 #if IS_ENABLED(CONFIG_IPV6)
1159 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1160 struct net_bridge_port *port,
1161 struct in6_addr *saddr)
1162 {
1163 if (!timer_pending(&br->ip6_own_query.timer) &&
1164 !timer_pending(&br->ip6_other_query.timer))
1165 goto update;
1166
1167 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1168 goto update;
1169
1170 return false;
1171
1172 update:
1173 br->ip6_querier.addr.u.ip6 = *saddr;
1174
1175 /* update protected by general multicast_lock by caller */
1176 rcu_assign_pointer(br->ip6_querier.port, port);
1177
1178 return true;
1179 }
1180 #endif
1181
1182 static bool br_multicast_select_querier(struct net_bridge *br,
1183 struct net_bridge_port *port,
1184 struct br_ip *saddr)
1185 {
1186 switch (saddr->proto) {
1187 case htons(ETH_P_IP):
1188 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1189 #if IS_ENABLED(CONFIG_IPV6)
1190 case htons(ETH_P_IPV6):
1191 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1192 #endif
1193 }
1194
1195 return false;
1196 }
1197
1198 static void
1199 br_multicast_update_query_timer(struct net_bridge *br,
1200 struct bridge_mcast_other_query *query,
1201 unsigned long max_delay)
1202 {
1203 if (!timer_pending(&query->timer))
1204 query->delay_time = jiffies + max_delay;
1205
1206 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1207 }
1208
1209 /*
1210 * Add port to router_list
1211 * list is maintained ordered by pointer value
1212 * and locked by br->multicast_lock and RCU
1213 */
1214 static void br_multicast_add_router(struct net_bridge *br,
1215 struct net_bridge_port *port)
1216 {
1217 struct net_bridge_port *p;
1218 struct hlist_node *slot = NULL;
1219
1220 if (!hlist_unhashed(&port->rlist))
1221 return;
1222
1223 hlist_for_each_entry(p, &br->router_list, rlist) {
1224 if ((unsigned long) port >= (unsigned long) p)
1225 break;
1226 slot = &p->rlist;
1227 }
1228
1229 if (slot)
1230 hlist_add_behind_rcu(&port->rlist, slot);
1231 else
1232 hlist_add_head_rcu(&port->rlist, &br->router_list);
1233 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1234 }
1235
1236 static void br_multicast_mark_router(struct net_bridge *br,
1237 struct net_bridge_port *port)
1238 {
1239 unsigned long now = jiffies;
1240
1241 if (!port) {
1242 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1243 mod_timer(&br->multicast_router_timer,
1244 now + br->multicast_querier_interval);
1245 return;
1246 }
1247
1248 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1249 port->multicast_router == MDB_RTR_TYPE_PERM)
1250 return;
1251
1252 br_multicast_add_router(br, port);
1253
1254 mod_timer(&port->multicast_router_timer,
1255 now + br->multicast_querier_interval);
1256 }
1257
1258 static void br_multicast_query_received(struct net_bridge *br,
1259 struct net_bridge_port *port,
1260 struct bridge_mcast_other_query *query,
1261 struct br_ip *saddr,
1262 unsigned long max_delay)
1263 {
1264 if (!br_multicast_select_querier(br, port, saddr))
1265 return;
1266
1267 br_multicast_update_query_timer(br, query, max_delay);
1268 br_multicast_mark_router(br, port);
1269 }
1270
1271 static int br_ip4_multicast_query(struct net_bridge *br,
1272 struct net_bridge_port *port,
1273 struct sk_buff *skb,
1274 u16 vid)
1275 {
1276 const struct iphdr *iph = ip_hdr(skb);
1277 struct igmphdr *ih = igmp_hdr(skb);
1278 struct net_bridge_mdb_entry *mp;
1279 struct igmpv3_query *ih3;
1280 struct net_bridge_port_group *p;
1281 struct net_bridge_port_group __rcu **pp;
1282 struct br_ip saddr;
1283 unsigned long max_delay;
1284 unsigned long now = jiffies;
1285 unsigned int offset = skb_transport_offset(skb);
1286 __be32 group;
1287 int err = 0;
1288
1289 spin_lock(&br->multicast_lock);
1290 if (!netif_running(br->dev) ||
1291 (port && port->state == BR_STATE_DISABLED))
1292 goto out;
1293
1294 group = ih->group;
1295
1296 if (skb->len == offset + sizeof(*ih)) {
1297 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1298
1299 if (!max_delay) {
1300 max_delay = 10 * HZ;
1301 group = 0;
1302 }
1303 } else if (skb->len >= offset + sizeof(*ih3)) {
1304 ih3 = igmpv3_query_hdr(skb);
1305 if (ih3->nsrcs)
1306 goto out;
1307
1308 max_delay = ih3->code ?
1309 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1310 } else {
1311 goto out;
1312 }
1313
1314 if (!group) {
1315 saddr.proto = htons(ETH_P_IP);
1316 saddr.u.ip4 = iph->saddr;
1317
1318 br_multicast_query_received(br, port, &br->ip4_other_query,
1319 &saddr, max_delay);
1320 goto out;
1321 }
1322
1323 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1324 if (!mp)
1325 goto out;
1326
1327 max_delay *= br->multicast_last_member_count;
1328
1329 if (mp->mglist &&
1330 (timer_pending(&mp->timer) ?
1331 time_after(mp->timer.expires, now + max_delay) :
1332 try_to_del_timer_sync(&mp->timer) >= 0))
1333 mod_timer(&mp->timer, now + max_delay);
1334
1335 for (pp = &mp->ports;
1336 (p = mlock_dereference(*pp, br)) != NULL;
1337 pp = &p->next) {
1338 if (timer_pending(&p->timer) ?
1339 time_after(p->timer.expires, now + max_delay) :
1340 try_to_del_timer_sync(&p->timer) >= 0)
1341 mod_timer(&p->timer, now + max_delay);
1342 }
1343
1344 out:
1345 spin_unlock(&br->multicast_lock);
1346 return err;
1347 }
1348
1349 #if IS_ENABLED(CONFIG_IPV6)
1350 static int br_ip6_multicast_query(struct net_bridge *br,
1351 struct net_bridge_port *port,
1352 struct sk_buff *skb,
1353 u16 vid)
1354 {
1355 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1356 struct mld_msg *mld;
1357 struct net_bridge_mdb_entry *mp;
1358 struct mld2_query *mld2q;
1359 struct net_bridge_port_group *p;
1360 struct net_bridge_port_group __rcu **pp;
1361 struct br_ip saddr;
1362 unsigned long max_delay;
1363 unsigned long now = jiffies;
1364 unsigned int offset = skb_transport_offset(skb);
1365 const struct in6_addr *group = NULL;
1366 bool is_general_query;
1367 int err = 0;
1368
1369 spin_lock(&br->multicast_lock);
1370 if (!netif_running(br->dev) ||
1371 (port && port->state == BR_STATE_DISABLED))
1372 goto out;
1373
1374 if (skb->len == offset + sizeof(*mld)) {
1375 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1376 err = -EINVAL;
1377 goto out;
1378 }
1379 mld = (struct mld_msg *) icmp6_hdr(skb);
1380 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1381 if (max_delay)
1382 group = &mld->mld_mca;
1383 } else {
1384 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1385 err = -EINVAL;
1386 goto out;
1387 }
1388 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1389 if (!mld2q->mld2q_nsrcs)
1390 group = &mld2q->mld2q_mca;
1391
1392 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1393 }
1394
1395 is_general_query = group && ipv6_addr_any(group);
1396
1397 if (is_general_query) {
1398 saddr.proto = htons(ETH_P_IPV6);
1399 saddr.u.ip6 = ip6h->saddr;
1400
1401 br_multicast_query_received(br, port, &br->ip6_other_query,
1402 &saddr, max_delay);
1403 goto out;
1404 } else if (!group) {
1405 goto out;
1406 }
1407
1408 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1409 if (!mp)
1410 goto out;
1411
1412 max_delay *= br->multicast_last_member_count;
1413 if (mp->mglist &&
1414 (timer_pending(&mp->timer) ?
1415 time_after(mp->timer.expires, now + max_delay) :
1416 try_to_del_timer_sync(&mp->timer) >= 0))
1417 mod_timer(&mp->timer, now + max_delay);
1418
1419 for (pp = &mp->ports;
1420 (p = mlock_dereference(*pp, br)) != NULL;
1421 pp = &p->next) {
1422 if (timer_pending(&p->timer) ?
1423 time_after(p->timer.expires, now + max_delay) :
1424 try_to_del_timer_sync(&p->timer) >= 0)
1425 mod_timer(&p->timer, now + max_delay);
1426 }
1427
1428 out:
1429 spin_unlock(&br->multicast_lock);
1430 return err;
1431 }
1432 #endif
1433
1434 static void
1435 br_multicast_leave_group(struct net_bridge *br,
1436 struct net_bridge_port *port,
1437 struct br_ip *group,
1438 struct bridge_mcast_other_query *other_query,
1439 struct bridge_mcast_own_query *own_query)
1440 {
1441 struct net_bridge_mdb_htable *mdb;
1442 struct net_bridge_mdb_entry *mp;
1443 struct net_bridge_port_group *p;
1444 unsigned long now;
1445 unsigned long time;
1446
1447 spin_lock(&br->multicast_lock);
1448 if (!netif_running(br->dev) ||
1449 (port && port->state == BR_STATE_DISABLED))
1450 goto out;
1451
1452 mdb = mlock_dereference(br->mdb, br);
1453 mp = br_mdb_ip_get(mdb, group);
1454 if (!mp)
1455 goto out;
1456
1457 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1458 struct net_bridge_port_group __rcu **pp;
1459
1460 for (pp = &mp->ports;
1461 (p = mlock_dereference(*pp, br)) != NULL;
1462 pp = &p->next) {
1463 if (p->port != port)
1464 continue;
1465
1466 rcu_assign_pointer(*pp, p->next);
1467 hlist_del_init(&p->mglist);
1468 del_timer(&p->timer);
1469 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1470 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1471 p->flags);
1472
1473 if (!mp->ports && !mp->mglist &&
1474 netif_running(br->dev))
1475 mod_timer(&mp->timer, jiffies);
1476 }
1477 goto out;
1478 }
1479
1480 if (timer_pending(&other_query->timer))
1481 goto out;
1482
1483 if (br->multicast_querier) {
1484 __br_multicast_send_query(br, port, &mp->addr);
1485
1486 time = jiffies + br->multicast_last_member_count *
1487 br->multicast_last_member_interval;
1488
1489 mod_timer(&own_query->timer, time);
1490
1491 for (p = mlock_dereference(mp->ports, br);
1492 p != NULL;
1493 p = mlock_dereference(p->next, br)) {
1494 if (p->port != port)
1495 continue;
1496
1497 if (!hlist_unhashed(&p->mglist) &&
1498 (timer_pending(&p->timer) ?
1499 time_after(p->timer.expires, time) :
1500 try_to_del_timer_sync(&p->timer) >= 0)) {
1501 mod_timer(&p->timer, time);
1502 }
1503
1504 break;
1505 }
1506 }
1507
1508 now = jiffies;
1509 time = now + br->multicast_last_member_count *
1510 br->multicast_last_member_interval;
1511
1512 if (!port) {
1513 if (mp->mglist &&
1514 (timer_pending(&mp->timer) ?
1515 time_after(mp->timer.expires, time) :
1516 try_to_del_timer_sync(&mp->timer) >= 0)) {
1517 mod_timer(&mp->timer, time);
1518 }
1519
1520 goto out;
1521 }
1522
1523 for (p = mlock_dereference(mp->ports, br);
1524 p != NULL;
1525 p = mlock_dereference(p->next, br)) {
1526 if (p->port != port)
1527 continue;
1528
1529 if (!hlist_unhashed(&p->mglist) &&
1530 (timer_pending(&p->timer) ?
1531 time_after(p->timer.expires, time) :
1532 try_to_del_timer_sync(&p->timer) >= 0)) {
1533 mod_timer(&p->timer, time);
1534 }
1535
1536 break;
1537 }
1538 out:
1539 spin_unlock(&br->multicast_lock);
1540 }
1541
1542 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1543 struct net_bridge_port *port,
1544 __be32 group,
1545 __u16 vid)
1546 {
1547 struct br_ip br_group;
1548 struct bridge_mcast_own_query *own_query;
1549
1550 if (ipv4_is_local_multicast(group))
1551 return;
1552
1553 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1554
1555 br_group.u.ip4 = group;
1556 br_group.proto = htons(ETH_P_IP);
1557 br_group.vid = vid;
1558
1559 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1560 own_query);
1561 }
1562
1563 #if IS_ENABLED(CONFIG_IPV6)
1564 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1565 struct net_bridge_port *port,
1566 const struct in6_addr *group,
1567 __u16 vid)
1568 {
1569 struct br_ip br_group;
1570 struct bridge_mcast_own_query *own_query;
1571
1572 if (ipv6_addr_is_ll_all_nodes(group))
1573 return;
1574
1575 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1576
1577 br_group.u.ip6 = *group;
1578 br_group.proto = htons(ETH_P_IPV6);
1579 br_group.vid = vid;
1580
1581 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1582 own_query);
1583 }
1584 #endif
1585
1586 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1587 struct net_bridge_port *port,
1588 struct sk_buff *skb,
1589 u16 vid)
1590 {
1591 struct sk_buff *skb_trimmed = NULL;
1592 struct igmphdr *ih;
1593 int err;
1594
1595 err = ip_mc_check_igmp(skb, &skb_trimmed);
1596
1597 if (err == -ENOMSG) {
1598 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1599 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1600 return 0;
1601 } else if (err < 0) {
1602 return err;
1603 }
1604
1605 BR_INPUT_SKB_CB(skb)->igmp = 1;
1606 ih = igmp_hdr(skb);
1607
1608 switch (ih->type) {
1609 case IGMP_HOST_MEMBERSHIP_REPORT:
1610 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1611 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1612 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1613 break;
1614 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1615 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1616 break;
1617 case IGMP_HOST_MEMBERSHIP_QUERY:
1618 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1619 break;
1620 case IGMP_HOST_LEAVE_MESSAGE:
1621 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1622 break;
1623 }
1624
1625 if (skb_trimmed && skb_trimmed != skb)
1626 kfree_skb(skb_trimmed);
1627
1628 return err;
1629 }
1630
1631 #if IS_ENABLED(CONFIG_IPV6)
1632 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1633 struct net_bridge_port *port,
1634 struct sk_buff *skb,
1635 u16 vid)
1636 {
1637 struct sk_buff *skb_trimmed = NULL;
1638 struct mld_msg *mld;
1639 int err;
1640
1641 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1642
1643 if (err == -ENOMSG) {
1644 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1645 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1646 return 0;
1647 } else if (err < 0) {
1648 return err;
1649 }
1650
1651 BR_INPUT_SKB_CB(skb)->igmp = 1;
1652 mld = (struct mld_msg *)skb_transport_header(skb);
1653
1654 switch (mld->mld_type) {
1655 case ICMPV6_MGM_REPORT:
1656 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1657 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1658 break;
1659 case ICMPV6_MLD2_REPORT:
1660 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1661 break;
1662 case ICMPV6_MGM_QUERY:
1663 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1664 break;
1665 case ICMPV6_MGM_REDUCTION:
1666 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1667 break;
1668 }
1669
1670 if (skb_trimmed && skb_trimmed != skb)
1671 kfree_skb(skb_trimmed);
1672
1673 return err;
1674 }
1675 #endif
1676
1677 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1678 struct sk_buff *skb, u16 vid)
1679 {
1680 BR_INPUT_SKB_CB(skb)->igmp = 0;
1681 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1682
1683 if (br->multicast_disabled)
1684 return 0;
1685
1686 switch (skb->protocol) {
1687 case htons(ETH_P_IP):
1688 return br_multicast_ipv4_rcv(br, port, skb, vid);
1689 #if IS_ENABLED(CONFIG_IPV6)
1690 case htons(ETH_P_IPV6):
1691 return br_multicast_ipv6_rcv(br, port, skb, vid);
1692 #endif
1693 }
1694
1695 return 0;
1696 }
1697
1698 static void br_multicast_query_expired(struct net_bridge *br,
1699 struct bridge_mcast_own_query *query,
1700 struct bridge_mcast_querier *querier)
1701 {
1702 spin_lock(&br->multicast_lock);
1703 if (query->startup_sent < br->multicast_startup_query_count)
1704 query->startup_sent++;
1705
1706 RCU_INIT_POINTER(querier->port, NULL);
1707 br_multicast_send_query(br, NULL, query);
1708 spin_unlock(&br->multicast_lock);
1709 }
1710
1711 static void br_ip4_multicast_query_expired(unsigned long data)
1712 {
1713 struct net_bridge *br = (void *)data;
1714
1715 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1716 }
1717
1718 #if IS_ENABLED(CONFIG_IPV6)
1719 static void br_ip6_multicast_query_expired(unsigned long data)
1720 {
1721 struct net_bridge *br = (void *)data;
1722
1723 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1724 }
1725 #endif
1726
1727 void br_multicast_init(struct net_bridge *br)
1728 {
1729 br->hash_elasticity = 4;
1730 br->hash_max = 512;
1731
1732 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1733 br->multicast_querier = 0;
1734 br->multicast_query_use_ifaddr = 0;
1735 br->multicast_last_member_count = 2;
1736 br->multicast_startup_query_count = 2;
1737
1738 br->multicast_last_member_interval = HZ;
1739 br->multicast_query_response_interval = 10 * HZ;
1740 br->multicast_startup_query_interval = 125 * HZ / 4;
1741 br->multicast_query_interval = 125 * HZ;
1742 br->multicast_querier_interval = 255 * HZ;
1743 br->multicast_membership_interval = 260 * HZ;
1744
1745 br->ip4_other_query.delay_time = 0;
1746 br->ip4_querier.port = NULL;
1747 #if IS_ENABLED(CONFIG_IPV6)
1748 br->ip6_other_query.delay_time = 0;
1749 br->ip6_querier.port = NULL;
1750 #endif
1751 br->has_ipv6_addr = 1;
1752
1753 spin_lock_init(&br->multicast_lock);
1754 setup_timer(&br->multicast_router_timer,
1755 br_multicast_local_router_expired, 0);
1756 setup_timer(&br->ip4_other_query.timer,
1757 br_ip4_multicast_querier_expired, (unsigned long)br);
1758 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1759 (unsigned long)br);
1760 #if IS_ENABLED(CONFIG_IPV6)
1761 setup_timer(&br->ip6_other_query.timer,
1762 br_ip6_multicast_querier_expired, (unsigned long)br);
1763 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1764 (unsigned long)br);
1765 #endif
1766 }
1767
1768 static void __br_multicast_open(struct net_bridge *br,
1769 struct bridge_mcast_own_query *query)
1770 {
1771 query->startup_sent = 0;
1772
1773 if (br->multicast_disabled)
1774 return;
1775
1776 mod_timer(&query->timer, jiffies);
1777 }
1778
1779 void br_multicast_open(struct net_bridge *br)
1780 {
1781 __br_multicast_open(br, &br->ip4_own_query);
1782 #if IS_ENABLED(CONFIG_IPV6)
1783 __br_multicast_open(br, &br->ip6_own_query);
1784 #endif
1785 }
1786
1787 void br_multicast_stop(struct net_bridge *br)
1788 {
1789 del_timer_sync(&br->multicast_router_timer);
1790 del_timer_sync(&br->ip4_other_query.timer);
1791 del_timer_sync(&br->ip4_own_query.timer);
1792 #if IS_ENABLED(CONFIG_IPV6)
1793 del_timer_sync(&br->ip6_other_query.timer);
1794 del_timer_sync(&br->ip6_own_query.timer);
1795 #endif
1796 }
1797
1798 void br_multicast_dev_del(struct net_bridge *br)
1799 {
1800 struct net_bridge_mdb_htable *mdb;
1801 struct net_bridge_mdb_entry *mp;
1802 struct hlist_node *n;
1803 u32 ver;
1804 int i;
1805
1806 spin_lock_bh(&br->multicast_lock);
1807 mdb = mlock_dereference(br->mdb, br);
1808 if (!mdb)
1809 goto out;
1810
1811 br->mdb = NULL;
1812
1813 ver = mdb->ver;
1814 for (i = 0; i < mdb->max; i++) {
1815 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1816 hlist[ver]) {
1817 del_timer(&mp->timer);
1818 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1819 }
1820 }
1821
1822 if (mdb->old) {
1823 spin_unlock_bh(&br->multicast_lock);
1824 rcu_barrier_bh();
1825 spin_lock_bh(&br->multicast_lock);
1826 WARN_ON(mdb->old);
1827 }
1828
1829 mdb->old = mdb;
1830 call_rcu_bh(&mdb->rcu, br_mdb_free);
1831
1832 out:
1833 spin_unlock_bh(&br->multicast_lock);
1834 }
1835
1836 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1837 {
1838 int err = -EINVAL;
1839
1840 spin_lock_bh(&br->multicast_lock);
1841
1842 switch (val) {
1843 case MDB_RTR_TYPE_DISABLED:
1844 case MDB_RTR_TYPE_PERM:
1845 del_timer(&br->multicast_router_timer);
1846 /* fall through */
1847 case MDB_RTR_TYPE_TEMP_QUERY:
1848 br->multicast_router = val;
1849 err = 0;
1850 break;
1851 }
1852
1853 spin_unlock_bh(&br->multicast_lock);
1854
1855 return err;
1856 }
1857
1858 static void __del_port_router(struct net_bridge_port *p)
1859 {
1860 if (hlist_unhashed(&p->rlist))
1861 return;
1862 hlist_del_init_rcu(&p->rlist);
1863 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1864 }
1865
1866 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1867 {
1868 struct net_bridge *br = p->br;
1869 unsigned long now = jiffies;
1870 int err = -EINVAL;
1871
1872 spin_lock(&br->multicast_lock);
1873 if (p->multicast_router == val) {
1874 /* Refresh the temp router port timer */
1875 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1876 mod_timer(&p->multicast_router_timer,
1877 now + br->multicast_querier_interval);
1878 err = 0;
1879 goto unlock;
1880 }
1881 switch (val) {
1882 case MDB_RTR_TYPE_DISABLED:
1883 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1884 __del_port_router(p);
1885 del_timer(&p->multicast_router_timer);
1886 break;
1887 case MDB_RTR_TYPE_TEMP_QUERY:
1888 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1889 __del_port_router(p);
1890 break;
1891 case MDB_RTR_TYPE_PERM:
1892 p->multicast_router = MDB_RTR_TYPE_PERM;
1893 del_timer(&p->multicast_router_timer);
1894 br_multicast_add_router(br, p);
1895 break;
1896 case MDB_RTR_TYPE_TEMP:
1897 p->multicast_router = MDB_RTR_TYPE_TEMP;
1898 br_multicast_mark_router(br, p);
1899 break;
1900 default:
1901 goto unlock;
1902 }
1903 err = 0;
1904 unlock:
1905 spin_unlock(&br->multicast_lock);
1906
1907 return err;
1908 }
1909
1910 static void br_multicast_start_querier(struct net_bridge *br,
1911 struct bridge_mcast_own_query *query)
1912 {
1913 struct net_bridge_port *port;
1914
1915 __br_multicast_open(br, query);
1916
1917 list_for_each_entry(port, &br->port_list, list) {
1918 if (port->state == BR_STATE_DISABLED ||
1919 port->state == BR_STATE_BLOCKING)
1920 continue;
1921
1922 if (query == &br->ip4_own_query)
1923 br_multicast_enable(&port->ip4_own_query);
1924 #if IS_ENABLED(CONFIG_IPV6)
1925 else
1926 br_multicast_enable(&port->ip6_own_query);
1927 #endif
1928 }
1929 }
1930
1931 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1932 {
1933 int err = 0;
1934 struct net_bridge_mdb_htable *mdb;
1935
1936 spin_lock_bh(&br->multicast_lock);
1937 if (br->multicast_disabled == !val)
1938 goto unlock;
1939
1940 br->multicast_disabled = !val;
1941 if (br->multicast_disabled)
1942 goto unlock;
1943
1944 if (!netif_running(br->dev))
1945 goto unlock;
1946
1947 mdb = mlock_dereference(br->mdb, br);
1948 if (mdb) {
1949 if (mdb->old) {
1950 err = -EEXIST;
1951 rollback:
1952 br->multicast_disabled = !!val;
1953 goto unlock;
1954 }
1955
1956 err = br_mdb_rehash(&br->mdb, mdb->max,
1957 br->hash_elasticity);
1958 if (err)
1959 goto rollback;
1960 }
1961
1962 br_multicast_start_querier(br, &br->ip4_own_query);
1963 #if IS_ENABLED(CONFIG_IPV6)
1964 br_multicast_start_querier(br, &br->ip6_own_query);
1965 #endif
1966
1967 unlock:
1968 spin_unlock_bh(&br->multicast_lock);
1969
1970 return err;
1971 }
1972
1973 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1974 {
1975 unsigned long max_delay;
1976
1977 val = !!val;
1978
1979 spin_lock_bh(&br->multicast_lock);
1980 if (br->multicast_querier == val)
1981 goto unlock;
1982
1983 br->multicast_querier = val;
1984 if (!val)
1985 goto unlock;
1986
1987 max_delay = br->multicast_query_response_interval;
1988
1989 if (!timer_pending(&br->ip4_other_query.timer))
1990 br->ip4_other_query.delay_time = jiffies + max_delay;
1991
1992 br_multicast_start_querier(br, &br->ip4_own_query);
1993
1994 #if IS_ENABLED(CONFIG_IPV6)
1995 if (!timer_pending(&br->ip6_other_query.timer))
1996 br->ip6_other_query.delay_time = jiffies + max_delay;
1997
1998 br_multicast_start_querier(br, &br->ip6_own_query);
1999 #endif
2000
2001 unlock:
2002 spin_unlock_bh(&br->multicast_lock);
2003
2004 return 0;
2005 }
2006
2007 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2008 {
2009 int err = -EINVAL;
2010 u32 old;
2011 struct net_bridge_mdb_htable *mdb;
2012
2013 spin_lock_bh(&br->multicast_lock);
2014 if (!is_power_of_2(val))
2015 goto unlock;
2016
2017 mdb = mlock_dereference(br->mdb, br);
2018 if (mdb && val < mdb->size)
2019 goto unlock;
2020
2021 err = 0;
2022
2023 old = br->hash_max;
2024 br->hash_max = val;
2025
2026 if (mdb) {
2027 if (mdb->old) {
2028 err = -EEXIST;
2029 rollback:
2030 br->hash_max = old;
2031 goto unlock;
2032 }
2033
2034 err = br_mdb_rehash(&br->mdb, br->hash_max,
2035 br->hash_elasticity);
2036 if (err)
2037 goto rollback;
2038 }
2039
2040 unlock:
2041 spin_unlock_bh(&br->multicast_lock);
2042
2043 return err;
2044 }
2045
2046 /**
2047 * br_multicast_list_adjacent - Returns snooped multicast addresses
2048 * @dev: The bridge port adjacent to which to retrieve addresses
2049 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2050 *
2051 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2052 * snooping feature on all bridge ports of dev's bridge device, excluding
2053 * the addresses from dev itself.
2054 *
2055 * Returns the number of items added to br_ip_list.
2056 *
2057 * Notes:
2058 * - br_ip_list needs to be initialized by caller
2059 * - br_ip_list might contain duplicates in the end
2060 * (needs to be taken care of by caller)
2061 * - br_ip_list needs to be freed by caller
2062 */
2063 int br_multicast_list_adjacent(struct net_device *dev,
2064 struct list_head *br_ip_list)
2065 {
2066 struct net_bridge *br;
2067 struct net_bridge_port *port;
2068 struct net_bridge_port_group *group;
2069 struct br_ip_list *entry;
2070 int count = 0;
2071
2072 rcu_read_lock();
2073 if (!br_ip_list || !br_port_exists(dev))
2074 goto unlock;
2075
2076 port = br_port_get_rcu(dev);
2077 if (!port || !port->br)
2078 goto unlock;
2079
2080 br = port->br;
2081
2082 list_for_each_entry_rcu(port, &br->port_list, list) {
2083 if (!port->dev || port->dev == dev)
2084 continue;
2085
2086 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2087 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2088 if (!entry)
2089 goto unlock;
2090
2091 entry->addr = group->addr;
2092 list_add(&entry->list, br_ip_list);
2093 count++;
2094 }
2095 }
2096
2097 unlock:
2098 rcu_read_unlock();
2099 return count;
2100 }
2101 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2102
2103 /**
2104 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2105 * @dev: The bridge port providing the bridge on which to check for a querier
2106 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2107 *
2108 * Checks whether the given interface has a bridge on top and if so returns
2109 * true if a valid querier exists anywhere on the bridged link layer.
2110 * Otherwise returns false.
2111 */
2112 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2113 {
2114 struct net_bridge *br;
2115 struct net_bridge_port *port;
2116 struct ethhdr eth;
2117 bool ret = false;
2118
2119 rcu_read_lock();
2120 if (!br_port_exists(dev))
2121 goto unlock;
2122
2123 port = br_port_get_rcu(dev);
2124 if (!port || !port->br)
2125 goto unlock;
2126
2127 br = port->br;
2128
2129 memset(&eth, 0, sizeof(eth));
2130 eth.h_proto = htons(proto);
2131
2132 ret = br_multicast_querier_exists(br, &eth);
2133
2134 unlock:
2135 rcu_read_unlock();
2136 return ret;
2137 }
2138 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2139
2140 /**
2141 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2142 * @dev: The bridge port adjacent to which to check for a querier
2143 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2144 *
2145 * Checks whether the given interface has a bridge on top and if so returns
2146 * true if a selected querier is behind one of the other ports of this
2147 * bridge. Otherwise returns false.
2148 */
2149 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2150 {
2151 struct net_bridge *br;
2152 struct net_bridge_port *port;
2153 bool ret = false;
2154
2155 rcu_read_lock();
2156 if (!br_port_exists(dev))
2157 goto unlock;
2158
2159 port = br_port_get_rcu(dev);
2160 if (!port || !port->br)
2161 goto unlock;
2162
2163 br = port->br;
2164
2165 switch (proto) {
2166 case ETH_P_IP:
2167 if (!timer_pending(&br->ip4_other_query.timer) ||
2168 rcu_dereference(br->ip4_querier.port) == port)
2169 goto unlock;
2170 break;
2171 #if IS_ENABLED(CONFIG_IPV6)
2172 case ETH_P_IPV6:
2173 if (!timer_pending(&br->ip6_other_query.timer) ||
2174 rcu_dereference(br->ip6_querier.port) == port)
2175 goto unlock;
2176 break;
2177 #endif
2178 default:
2179 goto unlock;
2180 }
2181
2182 ret = true;
2183 unlock:
2184 rcu_read_unlock();
2185 return ret;
2186 }
2187 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
Linux kernel - Deliverables
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