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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm...
[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 __be32 group;
1283 int err = 0;
1284
1285 spin_lock(&br->multicast_lock);
1286 if (!netif_running(br->dev) ||
1287 (port && port->state == BR_STATE_DISABLED))
1288 goto out;
1289
1290 group = ih->group;
1291
1292 if (skb->len == sizeof(*ih)) {
1293 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1294
1295 if (!max_delay) {
1296 max_delay = 10 * HZ;
1297 group = 0;
1298 }
1299 } else if (skb->len >= sizeof(*ih3)) {
1300 ih3 = igmpv3_query_hdr(skb);
1301 if (ih3->nsrcs)
1302 goto out;
1303
1304 max_delay = ih3->code ?
1305 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1306 } else {
1307 goto out;
1308 }
1309
1310 if (!group) {
1311 saddr.proto = htons(ETH_P_IP);
1312 saddr.u.ip4 = iph->saddr;
1313
1314 br_multicast_query_received(br, port, &br->ip4_other_query,
1315 &saddr, max_delay);
1316 goto out;
1317 }
1318
1319 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1320 if (!mp)
1321 goto out;
1322
1323 max_delay *= br->multicast_last_member_count;
1324
1325 if (mp->mglist &&
1326 (timer_pending(&mp->timer) ?
1327 time_after(mp->timer.expires, now + max_delay) :
1328 try_to_del_timer_sync(&mp->timer) >= 0))
1329 mod_timer(&mp->timer, now + max_delay);
1330
1331 for (pp = &mp->ports;
1332 (p = mlock_dereference(*pp, br)) != NULL;
1333 pp = &p->next) {
1334 if (timer_pending(&p->timer) ?
1335 time_after(p->timer.expires, now + max_delay) :
1336 try_to_del_timer_sync(&p->timer) >= 0)
1337 mod_timer(&p->timer, now + max_delay);
1338 }
1339
1340 out:
1341 spin_unlock(&br->multicast_lock);
1342 return err;
1343 }
1344
1345 #if IS_ENABLED(CONFIG_IPV6)
1346 static int br_ip6_multicast_query(struct net_bridge *br,
1347 struct net_bridge_port *port,
1348 struct sk_buff *skb,
1349 u16 vid)
1350 {
1351 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1352 struct mld_msg *mld;
1353 struct net_bridge_mdb_entry *mp;
1354 struct mld2_query *mld2q;
1355 struct net_bridge_port_group *p;
1356 struct net_bridge_port_group __rcu **pp;
1357 struct br_ip saddr;
1358 unsigned long max_delay;
1359 unsigned long now = jiffies;
1360 const struct in6_addr *group = NULL;
1361 bool is_general_query;
1362 int err = 0;
1363
1364 spin_lock(&br->multicast_lock);
1365 if (!netif_running(br->dev) ||
1366 (port && port->state == BR_STATE_DISABLED))
1367 goto out;
1368
1369 if (skb->len == sizeof(*mld)) {
1370 if (!pskb_may_pull(skb, sizeof(*mld))) {
1371 err = -EINVAL;
1372 goto out;
1373 }
1374 mld = (struct mld_msg *) icmp6_hdr(skb);
1375 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1376 if (max_delay)
1377 group = &mld->mld_mca;
1378 } else {
1379 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1380 err = -EINVAL;
1381 goto out;
1382 }
1383 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1384 if (!mld2q->mld2q_nsrcs)
1385 group = &mld2q->mld2q_mca;
1386
1387 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1388 }
1389
1390 is_general_query = group && ipv6_addr_any(group);
1391
1392 if (is_general_query) {
1393 saddr.proto = htons(ETH_P_IPV6);
1394 saddr.u.ip6 = ip6h->saddr;
1395
1396 br_multicast_query_received(br, port, &br->ip6_other_query,
1397 &saddr, max_delay);
1398 goto out;
1399 } else if (!group) {
1400 goto out;
1401 }
1402
1403 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1404 if (!mp)
1405 goto out;
1406
1407 max_delay *= br->multicast_last_member_count;
1408 if (mp->mglist &&
1409 (timer_pending(&mp->timer) ?
1410 time_after(mp->timer.expires, now + max_delay) :
1411 try_to_del_timer_sync(&mp->timer) >= 0))
1412 mod_timer(&mp->timer, now + max_delay);
1413
1414 for (pp = &mp->ports;
1415 (p = mlock_dereference(*pp, br)) != NULL;
1416 pp = &p->next) {
1417 if (timer_pending(&p->timer) ?
1418 time_after(p->timer.expires, now + max_delay) :
1419 try_to_del_timer_sync(&p->timer) >= 0)
1420 mod_timer(&p->timer, now + max_delay);
1421 }
1422
1423 out:
1424 spin_unlock(&br->multicast_lock);
1425 return err;
1426 }
1427 #endif
1428
1429 static void
1430 br_multicast_leave_group(struct net_bridge *br,
1431 struct net_bridge_port *port,
1432 struct br_ip *group,
1433 struct bridge_mcast_other_query *other_query,
1434 struct bridge_mcast_own_query *own_query)
1435 {
1436 struct net_bridge_mdb_htable *mdb;
1437 struct net_bridge_mdb_entry *mp;
1438 struct net_bridge_port_group *p;
1439 unsigned long now;
1440 unsigned long time;
1441
1442 spin_lock(&br->multicast_lock);
1443 if (!netif_running(br->dev) ||
1444 (port && port->state == BR_STATE_DISABLED))
1445 goto out;
1446
1447 mdb = mlock_dereference(br->mdb, br);
1448 mp = br_mdb_ip_get(mdb, group);
1449 if (!mp)
1450 goto out;
1451
1452 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1453 struct net_bridge_port_group __rcu **pp;
1454
1455 for (pp = &mp->ports;
1456 (p = mlock_dereference(*pp, br)) != NULL;
1457 pp = &p->next) {
1458 if (p->port != port)
1459 continue;
1460
1461 rcu_assign_pointer(*pp, p->next);
1462 hlist_del_init(&p->mglist);
1463 del_timer(&p->timer);
1464 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1465 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1466 p->flags);
1467
1468 if (!mp->ports && !mp->mglist &&
1469 netif_running(br->dev))
1470 mod_timer(&mp->timer, jiffies);
1471 }
1472 goto out;
1473 }
1474
1475 if (timer_pending(&other_query->timer))
1476 goto out;
1477
1478 if (br->multicast_querier) {
1479 __br_multicast_send_query(br, port, &mp->addr);
1480
1481 time = jiffies + br->multicast_last_member_count *
1482 br->multicast_last_member_interval;
1483
1484 mod_timer(&own_query->timer, time);
1485
1486 for (p = mlock_dereference(mp->ports, br);
1487 p != NULL;
1488 p = mlock_dereference(p->next, br)) {
1489 if (p->port != port)
1490 continue;
1491
1492 if (!hlist_unhashed(&p->mglist) &&
1493 (timer_pending(&p->timer) ?
1494 time_after(p->timer.expires, time) :
1495 try_to_del_timer_sync(&p->timer) >= 0)) {
1496 mod_timer(&p->timer, time);
1497 }
1498
1499 break;
1500 }
1501 }
1502
1503 now = jiffies;
1504 time = now + br->multicast_last_member_count *
1505 br->multicast_last_member_interval;
1506
1507 if (!port) {
1508 if (mp->mglist &&
1509 (timer_pending(&mp->timer) ?
1510 time_after(mp->timer.expires, time) :
1511 try_to_del_timer_sync(&mp->timer) >= 0)) {
1512 mod_timer(&mp->timer, time);
1513 }
1514
1515 goto out;
1516 }
1517
1518 for (p = mlock_dereference(mp->ports, br);
1519 p != NULL;
1520 p = mlock_dereference(p->next, br)) {
1521 if (p->port != port)
1522 continue;
1523
1524 if (!hlist_unhashed(&p->mglist) &&
1525 (timer_pending(&p->timer) ?
1526 time_after(p->timer.expires, time) :
1527 try_to_del_timer_sync(&p->timer) >= 0)) {
1528 mod_timer(&p->timer, time);
1529 }
1530
1531 break;
1532 }
1533 out:
1534 spin_unlock(&br->multicast_lock);
1535 }
1536
1537 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1538 struct net_bridge_port *port,
1539 __be32 group,
1540 __u16 vid)
1541 {
1542 struct br_ip br_group;
1543 struct bridge_mcast_own_query *own_query;
1544
1545 if (ipv4_is_local_multicast(group))
1546 return;
1547
1548 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1549
1550 br_group.u.ip4 = group;
1551 br_group.proto = htons(ETH_P_IP);
1552 br_group.vid = vid;
1553
1554 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1555 own_query);
1556 }
1557
1558 #if IS_ENABLED(CONFIG_IPV6)
1559 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1560 struct net_bridge_port *port,
1561 const struct in6_addr *group,
1562 __u16 vid)
1563 {
1564 struct br_ip br_group;
1565 struct bridge_mcast_own_query *own_query;
1566
1567 if (ipv6_addr_is_ll_all_nodes(group))
1568 return;
1569
1570 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1571
1572 br_group.u.ip6 = *group;
1573 br_group.proto = htons(ETH_P_IPV6);
1574 br_group.vid = vid;
1575
1576 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1577 own_query);
1578 }
1579 #endif
1580
1581 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1582 struct net_bridge_port *port,
1583 struct sk_buff *skb,
1584 u16 vid)
1585 {
1586 struct sk_buff *skb_trimmed = NULL;
1587 struct igmphdr *ih;
1588 int err;
1589
1590 err = ip_mc_check_igmp(skb, &skb_trimmed);
1591
1592 if (err == -ENOMSG) {
1593 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1594 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1595 return 0;
1596 } else if (err < 0) {
1597 return err;
1598 }
1599
1600 BR_INPUT_SKB_CB(skb)->igmp = 1;
1601 ih = igmp_hdr(skb);
1602
1603 switch (ih->type) {
1604 case IGMP_HOST_MEMBERSHIP_REPORT:
1605 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1606 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1607 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1608 break;
1609 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1610 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1611 break;
1612 case IGMP_HOST_MEMBERSHIP_QUERY:
1613 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1614 break;
1615 case IGMP_HOST_LEAVE_MESSAGE:
1616 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1617 break;
1618 }
1619
1620 if (skb_trimmed && skb_trimmed != skb)
1621 kfree_skb(skb_trimmed);
1622
1623 return err;
1624 }
1625
1626 #if IS_ENABLED(CONFIG_IPV6)
1627 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1628 struct net_bridge_port *port,
1629 struct sk_buff *skb,
1630 u16 vid)
1631 {
1632 struct sk_buff *skb_trimmed = NULL;
1633 struct mld_msg *mld;
1634 int err;
1635
1636 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1637
1638 if (err == -ENOMSG) {
1639 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1640 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1641 return 0;
1642 } else if (err < 0) {
1643 return err;
1644 }
1645
1646 BR_INPUT_SKB_CB(skb)->igmp = 1;
1647 mld = (struct mld_msg *)skb_transport_header(skb);
1648
1649 switch (mld->mld_type) {
1650 case ICMPV6_MGM_REPORT:
1651 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1652 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1653 break;
1654 case ICMPV6_MLD2_REPORT:
1655 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1656 break;
1657 case ICMPV6_MGM_QUERY:
1658 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1659 break;
1660 case ICMPV6_MGM_REDUCTION:
1661 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1662 break;
1663 }
1664
1665 if (skb_trimmed && skb_trimmed != skb)
1666 kfree_skb(skb_trimmed);
1667
1668 return err;
1669 }
1670 #endif
1671
1672 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1673 struct sk_buff *skb, u16 vid)
1674 {
1675 BR_INPUT_SKB_CB(skb)->igmp = 0;
1676 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1677
1678 if (br->multicast_disabled)
1679 return 0;
1680
1681 switch (skb->protocol) {
1682 case htons(ETH_P_IP):
1683 return br_multicast_ipv4_rcv(br, port, skb, vid);
1684 #if IS_ENABLED(CONFIG_IPV6)
1685 case htons(ETH_P_IPV6):
1686 return br_multicast_ipv6_rcv(br, port, skb, vid);
1687 #endif
1688 }
1689
1690 return 0;
1691 }
1692
1693 static void br_multicast_query_expired(struct net_bridge *br,
1694 struct bridge_mcast_own_query *query,
1695 struct bridge_mcast_querier *querier)
1696 {
1697 spin_lock(&br->multicast_lock);
1698 if (query->startup_sent < br->multicast_startup_query_count)
1699 query->startup_sent++;
1700
1701 RCU_INIT_POINTER(querier->port, NULL);
1702 br_multicast_send_query(br, NULL, query);
1703 spin_unlock(&br->multicast_lock);
1704 }
1705
1706 static void br_ip4_multicast_query_expired(unsigned long data)
1707 {
1708 struct net_bridge *br = (void *)data;
1709
1710 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1711 }
1712
1713 #if IS_ENABLED(CONFIG_IPV6)
1714 static void br_ip6_multicast_query_expired(unsigned long data)
1715 {
1716 struct net_bridge *br = (void *)data;
1717
1718 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1719 }
1720 #endif
1721
1722 void br_multicast_init(struct net_bridge *br)
1723 {
1724 br->hash_elasticity = 4;
1725 br->hash_max = 512;
1726
1727 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1728 br->multicast_querier = 0;
1729 br->multicast_query_use_ifaddr = 0;
1730 br->multicast_last_member_count = 2;
1731 br->multicast_startup_query_count = 2;
1732
1733 br->multicast_last_member_interval = HZ;
1734 br->multicast_query_response_interval = 10 * HZ;
1735 br->multicast_startup_query_interval = 125 * HZ / 4;
1736 br->multicast_query_interval = 125 * HZ;
1737 br->multicast_querier_interval = 255 * HZ;
1738 br->multicast_membership_interval = 260 * HZ;
1739
1740 br->ip4_other_query.delay_time = 0;
1741 br->ip4_querier.port = NULL;
1742 #if IS_ENABLED(CONFIG_IPV6)
1743 br->ip6_other_query.delay_time = 0;
1744 br->ip6_querier.port = NULL;
1745 #endif
1746
1747 spin_lock_init(&br->multicast_lock);
1748 setup_timer(&br->multicast_router_timer,
1749 br_multicast_local_router_expired, 0);
1750 setup_timer(&br->ip4_other_query.timer,
1751 br_ip4_multicast_querier_expired, (unsigned long)br);
1752 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1753 (unsigned long)br);
1754 #if IS_ENABLED(CONFIG_IPV6)
1755 setup_timer(&br->ip6_other_query.timer,
1756 br_ip6_multicast_querier_expired, (unsigned long)br);
1757 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1758 (unsigned long)br);
1759 #endif
1760 }
1761
1762 static void __br_multicast_open(struct net_bridge *br,
1763 struct bridge_mcast_own_query *query)
1764 {
1765 query->startup_sent = 0;
1766
1767 if (br->multicast_disabled)
1768 return;
1769
1770 mod_timer(&query->timer, jiffies);
1771 }
1772
1773 void br_multicast_open(struct net_bridge *br)
1774 {
1775 __br_multicast_open(br, &br->ip4_own_query);
1776 #if IS_ENABLED(CONFIG_IPV6)
1777 __br_multicast_open(br, &br->ip6_own_query);
1778 #endif
1779 }
1780
1781 void br_multicast_stop(struct net_bridge *br)
1782 {
1783 del_timer_sync(&br->multicast_router_timer);
1784 del_timer_sync(&br->ip4_other_query.timer);
1785 del_timer_sync(&br->ip4_own_query.timer);
1786 #if IS_ENABLED(CONFIG_IPV6)
1787 del_timer_sync(&br->ip6_other_query.timer);
1788 del_timer_sync(&br->ip6_own_query.timer);
1789 #endif
1790 }
1791
1792 void br_multicast_dev_del(struct net_bridge *br)
1793 {
1794 struct net_bridge_mdb_htable *mdb;
1795 struct net_bridge_mdb_entry *mp;
1796 struct hlist_node *n;
1797 u32 ver;
1798 int i;
1799
1800 spin_lock_bh(&br->multicast_lock);
1801 mdb = mlock_dereference(br->mdb, br);
1802 if (!mdb)
1803 goto out;
1804
1805 br->mdb = NULL;
1806
1807 ver = mdb->ver;
1808 for (i = 0; i < mdb->max; i++) {
1809 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1810 hlist[ver]) {
1811 del_timer(&mp->timer);
1812 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1813 }
1814 }
1815
1816 if (mdb->old) {
1817 spin_unlock_bh(&br->multicast_lock);
1818 rcu_barrier_bh();
1819 spin_lock_bh(&br->multicast_lock);
1820 WARN_ON(mdb->old);
1821 }
1822
1823 mdb->old = mdb;
1824 call_rcu_bh(&mdb->rcu, br_mdb_free);
1825
1826 out:
1827 spin_unlock_bh(&br->multicast_lock);
1828 }
1829
1830 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1831 {
1832 int err = -EINVAL;
1833
1834 spin_lock_bh(&br->multicast_lock);
1835
1836 switch (val) {
1837 case MDB_RTR_TYPE_DISABLED:
1838 case MDB_RTR_TYPE_PERM:
1839 del_timer(&br->multicast_router_timer);
1840 /* fall through */
1841 case MDB_RTR_TYPE_TEMP_QUERY:
1842 br->multicast_router = val;
1843 err = 0;
1844 break;
1845 }
1846
1847 spin_unlock_bh(&br->multicast_lock);
1848
1849 return err;
1850 }
1851
1852 static void __del_port_router(struct net_bridge_port *p)
1853 {
1854 if (hlist_unhashed(&p->rlist))
1855 return;
1856 hlist_del_init_rcu(&p->rlist);
1857 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1858 }
1859
1860 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1861 {
1862 struct net_bridge *br = p->br;
1863 unsigned long now = jiffies;
1864 int err = -EINVAL;
1865
1866 spin_lock(&br->multicast_lock);
1867 if (p->multicast_router == val) {
1868 /* Refresh the temp router port timer */
1869 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1870 mod_timer(&p->multicast_router_timer,
1871 now + br->multicast_querier_interval);
1872 err = 0;
1873 goto unlock;
1874 }
1875 switch (val) {
1876 case MDB_RTR_TYPE_DISABLED:
1877 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1878 __del_port_router(p);
1879 del_timer(&p->multicast_router_timer);
1880 break;
1881 case MDB_RTR_TYPE_TEMP_QUERY:
1882 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1883 __del_port_router(p);
1884 break;
1885 case MDB_RTR_TYPE_PERM:
1886 p->multicast_router = MDB_RTR_TYPE_PERM;
1887 del_timer(&p->multicast_router_timer);
1888 br_multicast_add_router(br, p);
1889 break;
1890 case MDB_RTR_TYPE_TEMP:
1891 p->multicast_router = MDB_RTR_TYPE_TEMP;
1892 br_multicast_mark_router(br, p);
1893 break;
1894 default:
1895 goto unlock;
1896 }
1897 err = 0;
1898 unlock:
1899 spin_unlock(&br->multicast_lock);
1900
1901 return err;
1902 }
1903
1904 static void br_multicast_start_querier(struct net_bridge *br,
1905 struct bridge_mcast_own_query *query)
1906 {
1907 struct net_bridge_port *port;
1908
1909 __br_multicast_open(br, query);
1910
1911 list_for_each_entry(port, &br->port_list, list) {
1912 if (port->state == BR_STATE_DISABLED ||
1913 port->state == BR_STATE_BLOCKING)
1914 continue;
1915
1916 if (query == &br->ip4_own_query)
1917 br_multicast_enable(&port->ip4_own_query);
1918 #if IS_ENABLED(CONFIG_IPV6)
1919 else
1920 br_multicast_enable(&port->ip6_own_query);
1921 #endif
1922 }
1923 }
1924
1925 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1926 {
1927 int err = 0;
1928 struct net_bridge_mdb_htable *mdb;
1929
1930 spin_lock_bh(&br->multicast_lock);
1931 if (br->multicast_disabled == !val)
1932 goto unlock;
1933
1934 br->multicast_disabled = !val;
1935 if (br->multicast_disabled)
1936 goto unlock;
1937
1938 if (!netif_running(br->dev))
1939 goto unlock;
1940
1941 mdb = mlock_dereference(br->mdb, br);
1942 if (mdb) {
1943 if (mdb->old) {
1944 err = -EEXIST;
1945 rollback:
1946 br->multicast_disabled = !!val;
1947 goto unlock;
1948 }
1949
1950 err = br_mdb_rehash(&br->mdb, mdb->max,
1951 br->hash_elasticity);
1952 if (err)
1953 goto rollback;
1954 }
1955
1956 br_multicast_start_querier(br, &br->ip4_own_query);
1957 #if IS_ENABLED(CONFIG_IPV6)
1958 br_multicast_start_querier(br, &br->ip6_own_query);
1959 #endif
1960
1961 unlock:
1962 spin_unlock_bh(&br->multicast_lock);
1963
1964 return err;
1965 }
1966
1967 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1968 {
1969 unsigned long max_delay;
1970
1971 val = !!val;
1972
1973 spin_lock_bh(&br->multicast_lock);
1974 if (br->multicast_querier == val)
1975 goto unlock;
1976
1977 br->multicast_querier = val;
1978 if (!val)
1979 goto unlock;
1980
1981 max_delay = br->multicast_query_response_interval;
1982
1983 if (!timer_pending(&br->ip4_other_query.timer))
1984 br->ip4_other_query.delay_time = jiffies + max_delay;
1985
1986 br_multicast_start_querier(br, &br->ip4_own_query);
1987
1988 #if IS_ENABLED(CONFIG_IPV6)
1989 if (!timer_pending(&br->ip6_other_query.timer))
1990 br->ip6_other_query.delay_time = jiffies + max_delay;
1991
1992 br_multicast_start_querier(br, &br->ip6_own_query);
1993 #endif
1994
1995 unlock:
1996 spin_unlock_bh(&br->multicast_lock);
1997
1998 return 0;
1999 }
2000
2001 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2002 {
2003 int err = -EINVAL;
2004 u32 old;
2005 struct net_bridge_mdb_htable *mdb;
2006
2007 spin_lock_bh(&br->multicast_lock);
2008 if (!is_power_of_2(val))
2009 goto unlock;
2010
2011 mdb = mlock_dereference(br->mdb, br);
2012 if (mdb && val < mdb->size)
2013 goto unlock;
2014
2015 err = 0;
2016
2017 old = br->hash_max;
2018 br->hash_max = val;
2019
2020 if (mdb) {
2021 if (mdb->old) {
2022 err = -EEXIST;
2023 rollback:
2024 br->hash_max = old;
2025 goto unlock;
2026 }
2027
2028 err = br_mdb_rehash(&br->mdb, br->hash_max,
2029 br->hash_elasticity);
2030 if (err)
2031 goto rollback;
2032 }
2033
2034 unlock:
2035 spin_unlock_bh(&br->multicast_lock);
2036
2037 return err;
2038 }
2039
2040 /**
2041 * br_multicast_list_adjacent - Returns snooped multicast addresses
2042 * @dev: The bridge port adjacent to which to retrieve addresses
2043 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2044 *
2045 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2046 * snooping feature on all bridge ports of dev's bridge device, excluding
2047 * the addresses from dev itself.
2048 *
2049 * Returns the number of items added to br_ip_list.
2050 *
2051 * Notes:
2052 * - br_ip_list needs to be initialized by caller
2053 * - br_ip_list might contain duplicates in the end
2054 * (needs to be taken care of by caller)
2055 * - br_ip_list needs to be freed by caller
2056 */
2057 int br_multicast_list_adjacent(struct net_device *dev,
2058 struct list_head *br_ip_list)
2059 {
2060 struct net_bridge *br;
2061 struct net_bridge_port *port;
2062 struct net_bridge_port_group *group;
2063 struct br_ip_list *entry;
2064 int count = 0;
2065
2066 rcu_read_lock();
2067 if (!br_ip_list || !br_port_exists(dev))
2068 goto unlock;
2069
2070 port = br_port_get_rcu(dev);
2071 if (!port || !port->br)
2072 goto unlock;
2073
2074 br = port->br;
2075
2076 list_for_each_entry_rcu(port, &br->port_list, list) {
2077 if (!port->dev || port->dev == dev)
2078 continue;
2079
2080 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2081 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2082 if (!entry)
2083 goto unlock;
2084
2085 entry->addr = group->addr;
2086 list_add(&entry->list, br_ip_list);
2087 count++;
2088 }
2089 }
2090
2091 unlock:
2092 rcu_read_unlock();
2093 return count;
2094 }
2095 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2096
2097 /**
2098 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2099 * @dev: The bridge port providing the bridge on which to check for a querier
2100 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2101 *
2102 * Checks whether the given interface has a bridge on top and if so returns
2103 * true if a valid querier exists anywhere on the bridged link layer.
2104 * Otherwise returns false.
2105 */
2106 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2107 {
2108 struct net_bridge *br;
2109 struct net_bridge_port *port;
2110 struct ethhdr eth;
2111 bool ret = false;
2112
2113 rcu_read_lock();
2114 if (!br_port_exists(dev))
2115 goto unlock;
2116
2117 port = br_port_get_rcu(dev);
2118 if (!port || !port->br)
2119 goto unlock;
2120
2121 br = port->br;
2122
2123 memset(&eth, 0, sizeof(eth));
2124 eth.h_proto = htons(proto);
2125
2126 ret = br_multicast_querier_exists(br, &eth);
2127
2128 unlock:
2129 rcu_read_unlock();
2130 return ret;
2131 }
2132 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2133
2134 /**
2135 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2136 * @dev: The bridge port adjacent to which to check for a querier
2137 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2138 *
2139 * Checks whether the given interface has a bridge on top and if so returns
2140 * true if a selected querier is behind one of the other ports of this
2141 * bridge. Otherwise returns false.
2142 */
2143 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2144 {
2145 struct net_bridge *br;
2146 struct net_bridge_port *port;
2147 bool ret = false;
2148
2149 rcu_read_lock();
2150 if (!br_port_exists(dev))
2151 goto unlock;
2152
2153 port = br_port_get_rcu(dev);
2154 if (!port || !port->br)
2155 goto unlock;
2156
2157 br = port->br;
2158
2159 switch (proto) {
2160 case ETH_P_IP:
2161 if (!timer_pending(&br->ip4_other_query.timer) ||
2162 rcu_dereference(br->ip4_querier.port) == port)
2163 goto unlock;
2164 break;
2165 #if IS_ENABLED(CONFIG_IPV6)
2166 case ETH_P_IPV6:
2167 if (!timer_pending(&br->ip6_other_query.timer) ||
2168 rcu_dereference(br->ip6_querier.port) == port)
2169 goto unlock;
2170 break;
2171 #endif
2172 default:
2173 goto unlock;
2174 }
2175
2176 ret = true;
2177 unlock:
2178 rcu_read_unlock();
2179 return ret;
2180 }
2181 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
Linux kernel - Deliverables
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