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drm/i915: Eliminate the CDCLK_CTL RMW on BXT
[linux-2.6/btrfs-unstable.git] / net / bridge / br_multicast.c
bloba4c15df2b7920301f7d12918dc21a1d6f2474352
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, RTM_DELMDB);
287 call_rcu_bh(&p->rcu, br_multicast_free_pg);
288
289 if (!mp->ports && !mp->mglist &&
290 netif_running(br->dev))
291 mod_timer(&mp->timer, jiffies);
292
293 return;
294 }
295
296 WARN_ON(1);
297 }
298
299 static void br_multicast_port_group_expired(unsigned long data)
300 {
301 struct net_bridge_port_group *pg = (void *)data;
302 struct net_bridge *br = pg->port->br;
303
304 spin_lock(&br->multicast_lock);
305 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
306 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
307 goto out;
308
309 br_multicast_del_pg(br, pg);
310
311 out:
312 spin_unlock(&br->multicast_lock);
313 }
314
315 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
316 int elasticity)
317 {
318 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
319 struct net_bridge_mdb_htable *mdb;
320 int err;
321
322 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
323 if (!mdb)
324 return -ENOMEM;
325
326 mdb->max = max;
327 mdb->old = old;
328
329 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
330 if (!mdb->mhash) {
331 kfree(mdb);
332 return -ENOMEM;
333 }
334
335 mdb->size = old ? old->size : 0;
336 mdb->ver = old ? old->ver ^ 1 : 0;
337
338 if (!old || elasticity)
339 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
340 else
341 mdb->secret = old->secret;
342
343 if (!old)
344 goto out;
345
346 err = br_mdb_copy(mdb, old, elasticity);
347 if (err) {
348 kfree(mdb->mhash);
349 kfree(mdb);
350 return err;
351 }
352
353 br_mdb_rehash_seq++;
354 call_rcu_bh(&mdb->rcu, br_mdb_free);
355
356 out:
357 rcu_assign_pointer(*mdbp, mdb);
358
359 return 0;
360 }
361
362 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
363 __be32 group)
364 {
365 struct sk_buff *skb;
366 struct igmphdr *ih;
367 struct ethhdr *eth;
368 struct iphdr *iph;
369
370 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
371 sizeof(*ih) + 4);
372 if (!skb)
373 goto out;
374
375 skb->protocol = htons(ETH_P_IP);
376
377 skb_reset_mac_header(skb);
378 eth = eth_hdr(skb);
379
380 ether_addr_copy(eth->h_source, br->dev->dev_addr);
381 eth->h_dest[0] = 1;
382 eth->h_dest[1] = 0;
383 eth->h_dest[2] = 0x5e;
384 eth->h_dest[3] = 0;
385 eth->h_dest[4] = 0;
386 eth->h_dest[5] = 1;
387 eth->h_proto = htons(ETH_P_IP);
388 skb_put(skb, sizeof(*eth));
389
390 skb_set_network_header(skb, skb->len);
391 iph = ip_hdr(skb);
392
393 iph->version = 4;
394 iph->ihl = 6;
395 iph->tos = 0xc0;
396 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
397 iph->id = 0;
398 iph->frag_off = htons(IP_DF);
399 iph->ttl = 1;
400 iph->protocol = IPPROTO_IGMP;
401 iph->saddr = br->multicast_query_use_ifaddr ?
402 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
403 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
404 ((u8 *)&iph[1])[0] = IPOPT_RA;
405 ((u8 *)&iph[1])[1] = 4;
406 ((u8 *)&iph[1])[2] = 0;
407 ((u8 *)&iph[1])[3] = 0;
408 ip_send_check(iph);
409 skb_put(skb, 24);
410
411 skb_set_transport_header(skb, skb->len);
412 ih = igmp_hdr(skb);
413 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
414 ih->code = (group ? br->multicast_last_member_interval :
415 br->multicast_query_response_interval) /
416 (HZ / IGMP_TIMER_SCALE);
417 ih->group = group;
418 ih->csum = 0;
419 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
420 skb_put(skb, sizeof(*ih));
421
422 __skb_pull(skb, sizeof(*eth));
423
424 out:
425 return skb;
426 }
427
428 #if IS_ENABLED(CONFIG_IPV6)
429 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
430 const struct in6_addr *group)
431 {
432 struct sk_buff *skb;
433 struct ipv6hdr *ip6h;
434 struct mld_msg *mldq;
435 struct ethhdr *eth;
436 u8 *hopopt;
437 unsigned long interval;
438
439 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
440 8 + sizeof(*mldq));
441 if (!skb)
442 goto out;
443
444 skb->protocol = htons(ETH_P_IPV6);
445
446 /* Ethernet header */
447 skb_reset_mac_header(skb);
448 eth = eth_hdr(skb);
449
450 ether_addr_copy(eth->h_source, br->dev->dev_addr);
451 eth->h_proto = htons(ETH_P_IPV6);
452 skb_put(skb, sizeof(*eth));
453
454 /* IPv6 header + HbH option */
455 skb_set_network_header(skb, skb->len);
456 ip6h = ipv6_hdr(skb);
457
458 *(__force __be32 *)ip6h = htonl(0x60000000);
459 ip6h->payload_len = htons(8 + sizeof(*mldq));
460 ip6h->nexthdr = IPPROTO_HOPOPTS;
461 ip6h->hop_limit = 1;
462 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
463 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
464 &ip6h->saddr)) {
465 kfree_skb(skb);
466 return NULL;
467 }
468 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
469
470 hopopt = (u8 *)(ip6h + 1);
471 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
472 hopopt[1] = 0; /* length of HbH */
473 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
474 hopopt[3] = 2; /* Length of RA Option */
475 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
476 hopopt[5] = 0;
477 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
478 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
479
480 skb_put(skb, sizeof(*ip6h) + 8);
481
482 /* ICMPv6 */
483 skb_set_transport_header(skb, skb->len);
484 mldq = (struct mld_msg *) icmp6_hdr(skb);
485
486 interval = ipv6_addr_any(group) ?
487 br->multicast_query_response_interval :
488 br->multicast_last_member_interval;
489
490 mldq->mld_type = ICMPV6_MGM_QUERY;
491 mldq->mld_code = 0;
492 mldq->mld_cksum = 0;
493 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
494 mldq->mld_reserved = 0;
495 mldq->mld_mca = *group;
496
497 /* checksum */
498 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
499 sizeof(*mldq), IPPROTO_ICMPV6,
500 csum_partial(mldq,
501 sizeof(*mldq), 0));
502 skb_put(skb, sizeof(*mldq));
503
504 __skb_pull(skb, sizeof(*eth));
505
506 out:
507 return skb;
508 }
509 #endif
510
511 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
512 struct br_ip *addr)
513 {
514 switch (addr->proto) {
515 case htons(ETH_P_IP):
516 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
517 #if IS_ENABLED(CONFIG_IPV6)
518 case htons(ETH_P_IPV6):
519 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
520 #endif
521 }
522 return NULL;
523 }
524
525 static struct net_bridge_mdb_entry *br_multicast_get_group(
526 struct net_bridge *br, struct net_bridge_port *port,
527 struct br_ip *group, int hash)
528 {
529 struct net_bridge_mdb_htable *mdb;
530 struct net_bridge_mdb_entry *mp;
531 unsigned int count = 0;
532 unsigned int max;
533 int elasticity;
534 int err;
535
536 mdb = rcu_dereference_protected(br->mdb, 1);
537 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
538 count++;
539 if (unlikely(br_ip_equal(group, &mp->addr)))
540 return mp;
541 }
542
543 elasticity = 0;
544 max = mdb->max;
545
546 if (unlikely(count > br->hash_elasticity && count)) {
547 if (net_ratelimit())
548 br_info(br, "Multicast hash table "
549 "chain limit reached: %s\n",
550 port ? port->dev->name : br->dev->name);
551
552 elasticity = br->hash_elasticity;
553 }
554
555 if (mdb->size >= max) {
556 max *= 2;
557 if (unlikely(max > br->hash_max)) {
558 br_warn(br, "Multicast hash table maximum of %d "
559 "reached, disabling snooping: %s\n",
560 br->hash_max,
561 port ? port->dev->name : br->dev->name);
562 err = -E2BIG;
563 disable:
564 br->multicast_disabled = 1;
565 goto err;
566 }
567 }
568
569 if (max > mdb->max || elasticity) {
570 if (mdb->old) {
571 if (net_ratelimit())
572 br_info(br, "Multicast hash table "
573 "on fire: %s\n",
574 port ? port->dev->name : br->dev->name);
575 err = -EEXIST;
576 goto err;
577 }
578
579 err = br_mdb_rehash(&br->mdb, max, elasticity);
580 if (err) {
581 br_warn(br, "Cannot rehash multicast "
582 "hash table, disabling snooping: %s, %d, %d\n",
583 port ? port->dev->name : br->dev->name,
584 mdb->size, err);
585 goto disable;
586 }
587
588 err = -EAGAIN;
589 goto err;
590 }
591
592 return NULL;
593
594 err:
595 mp = ERR_PTR(err);
596 return mp;
597 }
598
599 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
600 struct net_bridge_port *port, struct br_ip *group)
601 {
602 struct net_bridge_mdb_htable *mdb;
603 struct net_bridge_mdb_entry *mp;
604 int hash;
605 int err;
606
607 mdb = rcu_dereference_protected(br->mdb, 1);
608 if (!mdb) {
609 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
610 if (err)
611 return ERR_PTR(err);
612 goto rehash;
613 }
614
615 hash = br_ip_hash(mdb, group);
616 mp = br_multicast_get_group(br, port, group, hash);
617 switch (PTR_ERR(mp)) {
618 case 0:
619 break;
620
621 case -EAGAIN:
622 rehash:
623 mdb = rcu_dereference_protected(br->mdb, 1);
624 hash = br_ip_hash(mdb, group);
625 break;
626
627 default:
628 goto out;
629 }
630
631 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
632 if (unlikely(!mp))
633 return ERR_PTR(-ENOMEM);
634
635 mp->br = br;
636 mp->addr = *group;
637 setup_timer(&mp->timer, br_multicast_group_expired,
638 (unsigned long)mp);
639
640 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
641 mdb->size++;
642
643 out:
644 return mp;
645 }
646
647 struct net_bridge_port_group *br_multicast_new_port_group(
648 struct net_bridge_port *port,
649 struct br_ip *group,
650 struct net_bridge_port_group __rcu *next,
651 unsigned char flags)
652 {
653 struct net_bridge_port_group *p;
654
655 p = kzalloc(sizeof(*p), GFP_ATOMIC);
656 if (unlikely(!p))
657 return NULL;
658
659 p->addr = *group;
660 p->port = port;
661 p->flags = flags;
662 rcu_assign_pointer(p->next, next);
663 hlist_add_head(&p->mglist, &port->mglist);
664 setup_timer(&p->timer, br_multicast_port_group_expired,
665 (unsigned long)p);
666 return p;
667 }
668
669 static int br_multicast_add_group(struct net_bridge *br,
670 struct net_bridge_port *port,
671 struct br_ip *group)
672 {
673 struct net_bridge_mdb_entry *mp;
674 struct net_bridge_port_group *p;
675 struct net_bridge_port_group __rcu **pp;
676 unsigned long now = jiffies;
677 int err;
678
679 spin_lock(&br->multicast_lock);
680 if (!netif_running(br->dev) ||
681 (port && port->state == BR_STATE_DISABLED))
682 goto out;
683
684 mp = br_multicast_new_group(br, port, group);
685 err = PTR_ERR(mp);
686 if (IS_ERR(mp))
687 goto err;
688
689 if (!port) {
690 mp->mglist = true;
691 mod_timer(&mp->timer, now + br->multicast_membership_interval);
692 goto out;
693 }
694
695 for (pp = &mp->ports;
696 (p = mlock_dereference(*pp, br)) != NULL;
697 pp = &p->next) {
698 if (p->port == port)
699 goto found;
700 if ((unsigned long)p->port < (unsigned long)port)
701 break;
702 }
703
704 p = br_multicast_new_port_group(port, group, *pp, 0);
705 if (unlikely(!p))
706 goto err;
707 rcu_assign_pointer(*pp, p);
708 br_mdb_notify(br->dev, p, RTM_NEWMDB);
709
710 found:
711 mod_timer(&p->timer, now + br->multicast_membership_interval);
712 out:
713 err = 0;
714
715 err:
716 spin_unlock(&br->multicast_lock);
717 return err;
718 }
719
720 static int br_ip4_multicast_add_group(struct net_bridge *br,
721 struct net_bridge_port *port,
722 __be32 group,
723 __u16 vid)
724 {
725 struct br_ip br_group;
726
727 if (ipv4_is_local_multicast(group))
728 return 0;
729
730 br_group.u.ip4 = group;
731 br_group.proto = htons(ETH_P_IP);
732 br_group.vid = vid;
733
734 return br_multicast_add_group(br, port, &br_group);
735 }
736
737 #if IS_ENABLED(CONFIG_IPV6)
738 static int br_ip6_multicast_add_group(struct net_bridge *br,
739 struct net_bridge_port *port,
740 const struct in6_addr *group,
741 __u16 vid)
742 {
743 struct br_ip br_group;
744
745 if (ipv6_addr_is_ll_all_nodes(group))
746 return 0;
747
748 br_group.u.ip6 = *group;
749 br_group.proto = htons(ETH_P_IPV6);
750 br_group.vid = vid;
751
752 return br_multicast_add_group(br, port, &br_group);
753 }
754 #endif
755
756 static void br_multicast_router_expired(unsigned long data)
757 {
758 struct net_bridge_port *port = (void *)data;
759 struct net_bridge *br = port->br;
760
761 spin_lock(&br->multicast_lock);
762 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
763 port->multicast_router == MDB_RTR_TYPE_PERM ||
764 timer_pending(&port->multicast_router_timer) ||
765 hlist_unhashed(&port->rlist))
766 goto out;
767
768 hlist_del_init_rcu(&port->rlist);
769 br_rtr_notify(br->dev, port, RTM_DELMDB);
770 /* Don't allow timer refresh if the router expired */
771 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
772 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
773
774 out:
775 spin_unlock(&br->multicast_lock);
776 }
777
778 static void br_multicast_local_router_expired(unsigned long data)
779 {
780 }
781
782 static void br_multicast_querier_expired(struct net_bridge *br,
783 struct bridge_mcast_own_query *query)
784 {
785 spin_lock(&br->multicast_lock);
786 if (!netif_running(br->dev) || br->multicast_disabled)
787 goto out;
788
789 br_multicast_start_querier(br, query);
790
791 out:
792 spin_unlock(&br->multicast_lock);
793 }
794
795 static void br_ip4_multicast_querier_expired(unsigned long data)
796 {
797 struct net_bridge *br = (void *)data;
798
799 br_multicast_querier_expired(br, &br->ip4_own_query);
800 }
801
802 #if IS_ENABLED(CONFIG_IPV6)
803 static void br_ip6_multicast_querier_expired(unsigned long data)
804 {
805 struct net_bridge *br = (void *)data;
806
807 br_multicast_querier_expired(br, &br->ip6_own_query);
808 }
809 #endif
810
811 static void br_multicast_select_own_querier(struct net_bridge *br,
812 struct br_ip *ip,
813 struct sk_buff *skb)
814 {
815 if (ip->proto == htons(ETH_P_IP))
816 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
817 #if IS_ENABLED(CONFIG_IPV6)
818 else
819 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
820 #endif
821 }
822
823 static void __br_multicast_send_query(struct net_bridge *br,
824 struct net_bridge_port *port,
825 struct br_ip *ip)
826 {
827 struct sk_buff *skb;
828
829 skb = br_multicast_alloc_query(br, ip);
830 if (!skb)
831 return;
832
833 if (port) {
834 skb->dev = port->dev;
835 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
836 dev_net(port->dev), NULL, skb, NULL, skb->dev,
837 br_dev_queue_push_xmit);
838 } else {
839 br_multicast_select_own_querier(br, ip, skb);
840 netif_rx(skb);
841 }
842 }
843
844 static void br_multicast_send_query(struct net_bridge *br,
845 struct net_bridge_port *port,
846 struct bridge_mcast_own_query *own_query)
847 {
848 unsigned long time;
849 struct br_ip br_group;
850 struct bridge_mcast_other_query *other_query = NULL;
851
852 if (!netif_running(br->dev) || br->multicast_disabled ||
853 !br->multicast_querier)
854 return;
855
856 memset(&br_group.u, 0, sizeof(br_group.u));
857
858 if (port ? (own_query == &port->ip4_own_query) :
859 (own_query == &br->ip4_own_query)) {
860 other_query = &br->ip4_other_query;
861 br_group.proto = htons(ETH_P_IP);
862 #if IS_ENABLED(CONFIG_IPV6)
863 } else {
864 other_query = &br->ip6_other_query;
865 br_group.proto = htons(ETH_P_IPV6);
866 #endif
867 }
868
869 if (!other_query || timer_pending(&other_query->timer))
870 return;
871
872 __br_multicast_send_query(br, port, &br_group);
873
874 time = jiffies;
875 time += own_query->startup_sent < br->multicast_startup_query_count ?
876 br->multicast_startup_query_interval :
877 br->multicast_query_interval;
878 mod_timer(&own_query->timer, time);
879 }
880
881 static void
882 br_multicast_port_query_expired(struct net_bridge_port *port,
883 struct bridge_mcast_own_query *query)
884 {
885 struct net_bridge *br = port->br;
886
887 spin_lock(&br->multicast_lock);
888 if (port->state == BR_STATE_DISABLED ||
889 port->state == BR_STATE_BLOCKING)
890 goto out;
891
892 if (query->startup_sent < br->multicast_startup_query_count)
893 query->startup_sent++;
894
895 br_multicast_send_query(port->br, port, query);
896
897 out:
898 spin_unlock(&br->multicast_lock);
899 }
900
901 static void br_ip4_multicast_port_query_expired(unsigned long data)
902 {
903 struct net_bridge_port *port = (void *)data;
904
905 br_multicast_port_query_expired(port, &port->ip4_own_query);
906 }
907
908 #if IS_ENABLED(CONFIG_IPV6)
909 static void br_ip6_multicast_port_query_expired(unsigned long data)
910 {
911 struct net_bridge_port *port = (void *)data;
912
913 br_multicast_port_query_expired(port, &port->ip6_own_query);
914 }
915 #endif
916
917 void br_multicast_add_port(struct net_bridge_port *port)
918 {
919 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
920
921 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
922 (unsigned long)port);
923 setup_timer(&port->ip4_own_query.timer,
924 br_ip4_multicast_port_query_expired, (unsigned long)port);
925 #if IS_ENABLED(CONFIG_IPV6)
926 setup_timer(&port->ip6_own_query.timer,
927 br_ip6_multicast_port_query_expired, (unsigned long)port);
928 #endif
929 }
930
931 void br_multicast_del_port(struct net_bridge_port *port)
932 {
933 struct net_bridge *br = port->br;
934 struct net_bridge_port_group *pg;
935 struct hlist_node *n;
936
937 /* Take care of the remaining groups, only perm ones should be left */
938 spin_lock_bh(&br->multicast_lock);
939 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
940 br_multicast_del_pg(br, pg);
941 spin_unlock_bh(&br->multicast_lock);
942 del_timer_sync(&port->multicast_router_timer);
943 }
944
945 static void br_multicast_enable(struct bridge_mcast_own_query *query)
946 {
947 query->startup_sent = 0;
948
949 if (try_to_del_timer_sync(&query->timer) >= 0 ||
950 del_timer(&query->timer))
951 mod_timer(&query->timer, jiffies);
952 }
953
954 void br_multicast_enable_port(struct net_bridge_port *port)
955 {
956 struct net_bridge *br = port->br;
957
958 spin_lock(&br->multicast_lock);
959 if (br->multicast_disabled || !netif_running(br->dev))
960 goto out;
961
962 br_multicast_enable(&port->ip4_own_query);
963 #if IS_ENABLED(CONFIG_IPV6)
964 br_multicast_enable(&port->ip6_own_query);
965 #endif
966 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
967 hlist_unhashed(&port->rlist))
968 br_multicast_add_router(br, port);
969
970 out:
971 spin_unlock(&br->multicast_lock);
972 }
973
974 void br_multicast_disable_port(struct net_bridge_port *port)
975 {
976 struct net_bridge *br = port->br;
977 struct net_bridge_port_group *pg;
978 struct hlist_node *n;
979
980 spin_lock(&br->multicast_lock);
981 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
982 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
983 br_multicast_del_pg(br, pg);
984
985 if (!hlist_unhashed(&port->rlist)) {
986 hlist_del_init_rcu(&port->rlist);
987 br_rtr_notify(br->dev, port, RTM_DELMDB);
988 /* Don't allow timer refresh if disabling */
989 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
990 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
991 }
992 del_timer(&port->multicast_router_timer);
993 del_timer(&port->ip4_own_query.timer);
994 #if IS_ENABLED(CONFIG_IPV6)
995 del_timer(&port->ip6_own_query.timer);
996 #endif
997 spin_unlock(&br->multicast_lock);
998 }
999
1000 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1001 struct net_bridge_port *port,
1002 struct sk_buff *skb,
1003 u16 vid)
1004 {
1005 struct igmpv3_report *ih;
1006 struct igmpv3_grec *grec;
1007 int i;
1008 int len;
1009 int num;
1010 int type;
1011 int err = 0;
1012 __be32 group;
1013
1014 ih = igmpv3_report_hdr(skb);
1015 num = ntohs(ih->ngrec);
1016 len = skb_transport_offset(skb) + sizeof(*ih);
1017
1018 for (i = 0; i < num; i++) {
1019 len += sizeof(*grec);
1020 if (!pskb_may_pull(skb, len))
1021 return -EINVAL;
1022
1023 grec = (void *)(skb->data + len - sizeof(*grec));
1024 group = grec->grec_mca;
1025 type = grec->grec_type;
1026
1027 len += ntohs(grec->grec_nsrcs) * 4;
1028 if (!pskb_may_pull(skb, len))
1029 return -EINVAL;
1030
1031 /* We treat this as an IGMPv2 report for now. */
1032 switch (type) {
1033 case IGMPV3_MODE_IS_INCLUDE:
1034 case IGMPV3_MODE_IS_EXCLUDE:
1035 case IGMPV3_CHANGE_TO_INCLUDE:
1036 case IGMPV3_CHANGE_TO_EXCLUDE:
1037 case IGMPV3_ALLOW_NEW_SOURCES:
1038 case IGMPV3_BLOCK_OLD_SOURCES:
1039 break;
1040
1041 default:
1042 continue;
1043 }
1044
1045 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1046 type == IGMPV3_MODE_IS_INCLUDE) &&
1047 ntohs(grec->grec_nsrcs) == 0) {
1048 br_ip4_multicast_leave_group(br, port, group, vid);
1049 } else {
1050 err = br_ip4_multicast_add_group(br, port, group, vid);
1051 if (err)
1052 break;
1053 }
1054 }
1055
1056 return err;
1057 }
1058
1059 #if IS_ENABLED(CONFIG_IPV6)
1060 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1061 struct net_bridge_port *port,
1062 struct sk_buff *skb,
1063 u16 vid)
1064 {
1065 struct icmp6hdr *icmp6h;
1066 struct mld2_grec *grec;
1067 int i;
1068 int len;
1069 int num;
1070 int err = 0;
1071
1072 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1073 return -EINVAL;
1074
1075 icmp6h = icmp6_hdr(skb);
1076 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1077 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1078
1079 for (i = 0; i < num; i++) {
1080 __be16 *nsrcs, _nsrcs;
1081
1082 nsrcs = skb_header_pointer(skb,
1083 len + offsetof(struct mld2_grec,
1084 grec_nsrcs),
1085 sizeof(_nsrcs), &_nsrcs);
1086 if (!nsrcs)
1087 return -EINVAL;
1088
1089 if (!pskb_may_pull(skb,
1090 len + sizeof(*grec) +
1091 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1092 return -EINVAL;
1093
1094 grec = (struct mld2_grec *)(skb->data + len);
1095 len += sizeof(*grec) +
1096 sizeof(struct in6_addr) * ntohs(*nsrcs);
1097
1098 /* We treat these as MLDv1 reports for now. */
1099 switch (grec->grec_type) {
1100 case MLD2_MODE_IS_INCLUDE:
1101 case MLD2_MODE_IS_EXCLUDE:
1102 case MLD2_CHANGE_TO_INCLUDE:
1103 case MLD2_CHANGE_TO_EXCLUDE:
1104 case MLD2_ALLOW_NEW_SOURCES:
1105 case MLD2_BLOCK_OLD_SOURCES:
1106 break;
1107
1108 default:
1109 continue;
1110 }
1111
1112 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1113 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1114 ntohs(*nsrcs) == 0) {
1115 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1116 vid);
1117 } else {
1118 err = br_ip6_multicast_add_group(br, port,
1119 &grec->grec_mca, vid);
1120 if (!err)
1121 break;
1122 }
1123 }
1124
1125 return err;
1126 }
1127 #endif
1128
1129 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1130 struct net_bridge_port *port,
1131 __be32 saddr)
1132 {
1133 if (!timer_pending(&br->ip4_own_query.timer) &&
1134 !timer_pending(&br->ip4_other_query.timer))
1135 goto update;
1136
1137 if (!br->ip4_querier.addr.u.ip4)
1138 goto update;
1139
1140 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1141 goto update;
1142
1143 return false;
1144
1145 update:
1146 br->ip4_querier.addr.u.ip4 = saddr;
1147
1148 /* update protected by general multicast_lock by caller */
1149 rcu_assign_pointer(br->ip4_querier.port, port);
1150
1151 return true;
1152 }
1153
1154 #if IS_ENABLED(CONFIG_IPV6)
1155 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1156 struct net_bridge_port *port,
1157 struct in6_addr *saddr)
1158 {
1159 if (!timer_pending(&br->ip6_own_query.timer) &&
1160 !timer_pending(&br->ip6_other_query.timer))
1161 goto update;
1162
1163 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1164 goto update;
1165
1166 return false;
1167
1168 update:
1169 br->ip6_querier.addr.u.ip6 = *saddr;
1170
1171 /* update protected by general multicast_lock by caller */
1172 rcu_assign_pointer(br->ip6_querier.port, port);
1173
1174 return true;
1175 }
1176 #endif
1177
1178 static bool br_multicast_select_querier(struct net_bridge *br,
1179 struct net_bridge_port *port,
1180 struct br_ip *saddr)
1181 {
1182 switch (saddr->proto) {
1183 case htons(ETH_P_IP):
1184 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1185 #if IS_ENABLED(CONFIG_IPV6)
1186 case htons(ETH_P_IPV6):
1187 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1188 #endif
1189 }
1190
1191 return false;
1192 }
1193
1194 static void
1195 br_multicast_update_query_timer(struct net_bridge *br,
1196 struct bridge_mcast_other_query *query,
1197 unsigned long max_delay)
1198 {
1199 if (!timer_pending(&query->timer))
1200 query->delay_time = jiffies + max_delay;
1201
1202 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1203 }
1204
1205 /*
1206 * Add port to router_list
1207 * list is maintained ordered by pointer value
1208 * and locked by br->multicast_lock and RCU
1209 */
1210 static void br_multicast_add_router(struct net_bridge *br,
1211 struct net_bridge_port *port)
1212 {
1213 struct net_bridge_port *p;
1214 struct hlist_node *slot = NULL;
1215
1216 if (!hlist_unhashed(&port->rlist))
1217 return;
1218
1219 hlist_for_each_entry(p, &br->router_list, rlist) {
1220 if ((unsigned long) port >= (unsigned long) p)
1221 break;
1222 slot = &p->rlist;
1223 }
1224
1225 if (slot)
1226 hlist_add_behind_rcu(&port->rlist, slot);
1227 else
1228 hlist_add_head_rcu(&port->rlist, &br->router_list);
1229 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1230 }
1231
1232 static void br_multicast_mark_router(struct net_bridge *br,
1233 struct net_bridge_port *port)
1234 {
1235 unsigned long now = jiffies;
1236
1237 if (!port) {
1238 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1239 mod_timer(&br->multicast_router_timer,
1240 now + br->multicast_querier_interval);
1241 return;
1242 }
1243
1244 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1245 port->multicast_router == MDB_RTR_TYPE_PERM)
1246 return;
1247
1248 br_multicast_add_router(br, port);
1249
1250 mod_timer(&port->multicast_router_timer,
1251 now + br->multicast_querier_interval);
1252 }
1253
1254 static void br_multicast_query_received(struct net_bridge *br,
1255 struct net_bridge_port *port,
1256 struct bridge_mcast_other_query *query,
1257 struct br_ip *saddr,
1258 unsigned long max_delay)
1259 {
1260 if (!br_multicast_select_querier(br, port, saddr))
1261 return;
1262
1263 br_multicast_update_query_timer(br, query, max_delay);
1264 br_multicast_mark_router(br, port);
1265 }
1266
1267 static int br_ip4_multicast_query(struct net_bridge *br,
1268 struct net_bridge_port *port,
1269 struct sk_buff *skb,
1270 u16 vid)
1271 {
1272 const struct iphdr *iph = ip_hdr(skb);
1273 struct igmphdr *ih = igmp_hdr(skb);
1274 struct net_bridge_mdb_entry *mp;
1275 struct igmpv3_query *ih3;
1276 struct net_bridge_port_group *p;
1277 struct net_bridge_port_group __rcu **pp;
1278 struct br_ip saddr;
1279 unsigned long max_delay;
1280 unsigned long now = jiffies;
1281 __be32 group;
1282 int err = 0;
1283
1284 spin_lock(&br->multicast_lock);
1285 if (!netif_running(br->dev) ||
1286 (port && port->state == BR_STATE_DISABLED))
1287 goto out;
1288
1289 group = ih->group;
1290
1291 if (skb->len == sizeof(*ih)) {
1292 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1293
1294 if (!max_delay) {
1295 max_delay = 10 * HZ;
1296 group = 0;
1297 }
1298 } else if (skb->len >= sizeof(*ih3)) {
1299 ih3 = igmpv3_query_hdr(skb);
1300 if (ih3->nsrcs)
1301 goto out;
1302
1303 max_delay = ih3->code ?
1304 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1305 } else {
1306 goto out;
1307 }
1308
1309 if (!group) {
1310 saddr.proto = htons(ETH_P_IP);
1311 saddr.u.ip4 = iph->saddr;
1312
1313 br_multicast_query_received(br, port, &br->ip4_other_query,
1314 &saddr, max_delay);
1315 goto out;
1316 }
1317
1318 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1319 if (!mp)
1320 goto out;
1321
1322 max_delay *= br->multicast_last_member_count;
1323
1324 if (mp->mglist &&
1325 (timer_pending(&mp->timer) ?
1326 time_after(mp->timer.expires, now + max_delay) :
1327 try_to_del_timer_sync(&mp->timer) >= 0))
1328 mod_timer(&mp->timer, now + max_delay);
1329
1330 for (pp = &mp->ports;
1331 (p = mlock_dereference(*pp, br)) != NULL;
1332 pp = &p->next) {
1333 if (timer_pending(&p->timer) ?
1334 time_after(p->timer.expires, now + max_delay) :
1335 try_to_del_timer_sync(&p->timer) >= 0)
1336 mod_timer(&p->timer, now + max_delay);
1337 }
1338
1339 out:
1340 spin_unlock(&br->multicast_lock);
1341 return err;
1342 }
1343
1344 #if IS_ENABLED(CONFIG_IPV6)
1345 static int br_ip6_multicast_query(struct net_bridge *br,
1346 struct net_bridge_port *port,
1347 struct sk_buff *skb,
1348 u16 vid)
1349 {
1350 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1351 struct mld_msg *mld;
1352 struct net_bridge_mdb_entry *mp;
1353 struct mld2_query *mld2q;
1354 struct net_bridge_port_group *p;
1355 struct net_bridge_port_group __rcu **pp;
1356 struct br_ip saddr;
1357 unsigned long max_delay;
1358 unsigned long now = jiffies;
1359 const struct in6_addr *group = NULL;
1360 bool is_general_query;
1361 int err = 0;
1362
1363 spin_lock(&br->multicast_lock);
1364 if (!netif_running(br->dev) ||
1365 (port && port->state == BR_STATE_DISABLED))
1366 goto out;
1367
1368 if (skb->len == sizeof(*mld)) {
1369 if (!pskb_may_pull(skb, sizeof(*mld))) {
1370 err = -EINVAL;
1371 goto out;
1372 }
1373 mld = (struct mld_msg *) icmp6_hdr(skb);
1374 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1375 if (max_delay)
1376 group = &mld->mld_mca;
1377 } else {
1378 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1379 err = -EINVAL;
1380 goto out;
1381 }
1382 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1383 if (!mld2q->mld2q_nsrcs)
1384 group = &mld2q->mld2q_mca;
1385
1386 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1387 }
1388
1389 is_general_query = group && ipv6_addr_any(group);
1390
1391 if (is_general_query) {
1392 saddr.proto = htons(ETH_P_IPV6);
1393 saddr.u.ip6 = ip6h->saddr;
1394
1395 br_multicast_query_received(br, port, &br->ip6_other_query,
1396 &saddr, max_delay);
1397 goto out;
1398 } else if (!group) {
1399 goto out;
1400 }
1401
1402 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1403 if (!mp)
1404 goto out;
1405
1406 max_delay *= br->multicast_last_member_count;
1407 if (mp->mglist &&
1408 (timer_pending(&mp->timer) ?
1409 time_after(mp->timer.expires, now + max_delay) :
1410 try_to_del_timer_sync(&mp->timer) >= 0))
1411 mod_timer(&mp->timer, now + max_delay);
1412
1413 for (pp = &mp->ports;
1414 (p = mlock_dereference(*pp, br)) != NULL;
1415 pp = &p->next) {
1416 if (timer_pending(&p->timer) ?
1417 time_after(p->timer.expires, now + max_delay) :
1418 try_to_del_timer_sync(&p->timer) >= 0)
1419 mod_timer(&p->timer, now + max_delay);
1420 }
1421
1422 out:
1423 spin_unlock(&br->multicast_lock);
1424 return err;
1425 }
1426 #endif
1427
1428 static void
1429 br_multicast_leave_group(struct net_bridge *br,
1430 struct net_bridge_port *port,
1431 struct br_ip *group,
1432 struct bridge_mcast_other_query *other_query,
1433 struct bridge_mcast_own_query *own_query)
1434 {
1435 struct net_bridge_mdb_htable *mdb;
1436 struct net_bridge_mdb_entry *mp;
1437 struct net_bridge_port_group *p;
1438 unsigned long now;
1439 unsigned long time;
1440
1441 spin_lock(&br->multicast_lock);
1442 if (!netif_running(br->dev) ||
1443 (port && port->state == BR_STATE_DISABLED))
1444 goto out;
1445
1446 mdb = mlock_dereference(br->mdb, br);
1447 mp = br_mdb_ip_get(mdb, group);
1448 if (!mp)
1449 goto out;
1450
1451 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1452 struct net_bridge_port_group __rcu **pp;
1453
1454 for (pp = &mp->ports;
1455 (p = mlock_dereference(*pp, br)) != NULL;
1456 pp = &p->next) {
1457 if (p->port != port)
1458 continue;
1459
1460 rcu_assign_pointer(*pp, p->next);
1461 hlist_del_init(&p->mglist);
1462 del_timer(&p->timer);
1463 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1464 br_mdb_notify(br->dev, p, RTM_DELMDB);
1465
1466 if (!mp->ports && !mp->mglist &&
1467 netif_running(br->dev))
1468 mod_timer(&mp->timer, jiffies);
1469 }
1470 goto out;
1471 }
1472
1473 if (timer_pending(&other_query->timer))
1474 goto out;
1475
1476 if (br->multicast_querier) {
1477 __br_multicast_send_query(br, port, &mp->addr);
1478
1479 time = jiffies + br->multicast_last_member_count *
1480 br->multicast_last_member_interval;
1481
1482 mod_timer(&own_query->timer, time);
1483
1484 for (p = mlock_dereference(mp->ports, br);
1485 p != NULL;
1486 p = mlock_dereference(p->next, br)) {
1487 if (p->port != port)
1488 continue;
1489
1490 if (!hlist_unhashed(&p->mglist) &&
1491 (timer_pending(&p->timer) ?
1492 time_after(p->timer.expires, time) :
1493 try_to_del_timer_sync(&p->timer) >= 0)) {
1494 mod_timer(&p->timer, time);
1495 }
1496
1497 break;
1498 }
1499 }
1500
1501 now = jiffies;
1502 time = now + br->multicast_last_member_count *
1503 br->multicast_last_member_interval;
1504
1505 if (!port) {
1506 if (mp->mglist &&
1507 (timer_pending(&mp->timer) ?
1508 time_after(mp->timer.expires, time) :
1509 try_to_del_timer_sync(&mp->timer) >= 0)) {
1510 mod_timer(&mp->timer, time);
1511 }
1512
1513 goto out;
1514 }
1515
1516 for (p = mlock_dereference(mp->ports, br);
1517 p != NULL;
1518 p = mlock_dereference(p->next, br)) {
1519 if (p->port != port)
1520 continue;
1521
1522 if (!hlist_unhashed(&p->mglist) &&
1523 (timer_pending(&p->timer) ?
1524 time_after(p->timer.expires, time) :
1525 try_to_del_timer_sync(&p->timer) >= 0)) {
1526 mod_timer(&p->timer, time);
1527 }
1528
1529 break;
1530 }
1531 out:
1532 spin_unlock(&br->multicast_lock);
1533 }
1534
1535 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1536 struct net_bridge_port *port,
1537 __be32 group,
1538 __u16 vid)
1539 {
1540 struct br_ip br_group;
1541 struct bridge_mcast_own_query *own_query;
1542
1543 if (ipv4_is_local_multicast(group))
1544 return;
1545
1546 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1547
1548 br_group.u.ip4 = group;
1549 br_group.proto = htons(ETH_P_IP);
1550 br_group.vid = vid;
1551
1552 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1553 own_query);
1554 }
1555
1556 #if IS_ENABLED(CONFIG_IPV6)
1557 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1558 struct net_bridge_port *port,
1559 const struct in6_addr *group,
1560 __u16 vid)
1561 {
1562 struct br_ip br_group;
1563 struct bridge_mcast_own_query *own_query;
1564
1565 if (ipv6_addr_is_ll_all_nodes(group))
1566 return;
1567
1568 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1569
1570 br_group.u.ip6 = *group;
1571 br_group.proto = htons(ETH_P_IPV6);
1572 br_group.vid = vid;
1573
1574 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1575 own_query);
1576 }
1577 #endif
1578
1579 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1580 struct net_bridge_port *port,
1581 struct sk_buff *skb,
1582 u16 vid)
1583 {
1584 struct sk_buff *skb_trimmed = NULL;
1585 struct igmphdr *ih;
1586 int err;
1587
1588 err = ip_mc_check_igmp(skb, &skb_trimmed);
1589
1590 if (err == -ENOMSG) {
1591 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1592 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1593 return 0;
1594 } else if (err < 0) {
1595 return err;
1596 }
1597
1598 BR_INPUT_SKB_CB(skb)->igmp = 1;
1599 ih = igmp_hdr(skb);
1600
1601 switch (ih->type) {
1602 case IGMP_HOST_MEMBERSHIP_REPORT:
1603 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1604 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1605 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1606 break;
1607 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1608 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1609 break;
1610 case IGMP_HOST_MEMBERSHIP_QUERY:
1611 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1612 break;
1613 case IGMP_HOST_LEAVE_MESSAGE:
1614 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1615 break;
1616 }
1617
1618 if (skb_trimmed && skb_trimmed != skb)
1619 kfree_skb(skb_trimmed);
1620
1621 return err;
1622 }
1623
1624 #if IS_ENABLED(CONFIG_IPV6)
1625 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1626 struct net_bridge_port *port,
1627 struct sk_buff *skb,
1628 u16 vid)
1629 {
1630 struct sk_buff *skb_trimmed = NULL;
1631 struct mld_msg *mld;
1632 int err;
1633
1634 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1635
1636 if (err == -ENOMSG) {
1637 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1638 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1639 return 0;
1640 } else if (err < 0) {
1641 return err;
1642 }
1643
1644 BR_INPUT_SKB_CB(skb)->igmp = 1;
1645 mld = (struct mld_msg *)skb_transport_header(skb);
1646
1647 switch (mld->mld_type) {
1648 case ICMPV6_MGM_REPORT:
1649 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1650 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1651 break;
1652 case ICMPV6_MLD2_REPORT:
1653 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1654 break;
1655 case ICMPV6_MGM_QUERY:
1656 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1657 break;
1658 case ICMPV6_MGM_REDUCTION:
1659 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1660 break;
1661 }
1662
1663 if (skb_trimmed && skb_trimmed != skb)
1664 kfree_skb(skb_trimmed);
1665
1666 return err;
1667 }
1668 #endif
1669
1670 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1671 struct sk_buff *skb, u16 vid)
1672 {
1673 BR_INPUT_SKB_CB(skb)->igmp = 0;
1674 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1675
1676 if (br->multicast_disabled)
1677 return 0;
1678
1679 switch (skb->protocol) {
1680 case htons(ETH_P_IP):
1681 return br_multicast_ipv4_rcv(br, port, skb, vid);
1682 #if IS_ENABLED(CONFIG_IPV6)
1683 case htons(ETH_P_IPV6):
1684 return br_multicast_ipv6_rcv(br, port, skb, vid);
1685 #endif
1686 }
1687
1688 return 0;
1689 }
1690
1691 static void br_multicast_query_expired(struct net_bridge *br,
1692 struct bridge_mcast_own_query *query,
1693 struct bridge_mcast_querier *querier)
1694 {
1695 spin_lock(&br->multicast_lock);
1696 if (query->startup_sent < br->multicast_startup_query_count)
1697 query->startup_sent++;
1698
1699 RCU_INIT_POINTER(querier->port, NULL);
1700 br_multicast_send_query(br, NULL, query);
1701 spin_unlock(&br->multicast_lock);
1702 }
1703
1704 static void br_ip4_multicast_query_expired(unsigned long data)
1705 {
1706 struct net_bridge *br = (void *)data;
1707
1708 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1709 }
1710
1711 #if IS_ENABLED(CONFIG_IPV6)
1712 static void br_ip6_multicast_query_expired(unsigned long data)
1713 {
1714 struct net_bridge *br = (void *)data;
1715
1716 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1717 }
1718 #endif
1719
1720 void br_multicast_init(struct net_bridge *br)
1721 {
1722 br->hash_elasticity = 4;
1723 br->hash_max = 512;
1724
1725 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1726 br->multicast_querier = 0;
1727 br->multicast_query_use_ifaddr = 0;
1728 br->multicast_last_member_count = 2;
1729 br->multicast_startup_query_count = 2;
1730
1731 br->multicast_last_member_interval = HZ;
1732 br->multicast_query_response_interval = 10 * HZ;
1733 br->multicast_startup_query_interval = 125 * HZ / 4;
1734 br->multicast_query_interval = 125 * HZ;
1735 br->multicast_querier_interval = 255 * HZ;
1736 br->multicast_membership_interval = 260 * HZ;
1737
1738 br->ip4_other_query.delay_time = 0;
1739 br->ip4_querier.port = NULL;
1740 #if IS_ENABLED(CONFIG_IPV6)
1741 br->ip6_other_query.delay_time = 0;
1742 br->ip6_querier.port = NULL;
1743 #endif
1744
1745 spin_lock_init(&br->multicast_lock);
1746 setup_timer(&br->multicast_router_timer,
1747 br_multicast_local_router_expired, 0);
1748 setup_timer(&br->ip4_other_query.timer,
1749 br_ip4_multicast_querier_expired, (unsigned long)br);
1750 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1751 (unsigned long)br);
1752 #if IS_ENABLED(CONFIG_IPV6)
1753 setup_timer(&br->ip6_other_query.timer,
1754 br_ip6_multicast_querier_expired, (unsigned long)br);
1755 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1756 (unsigned long)br);
1757 #endif
1758 }
1759
1760 static void __br_multicast_open(struct net_bridge *br,
1761 struct bridge_mcast_own_query *query)
1762 {
1763 query->startup_sent = 0;
1764
1765 if (br->multicast_disabled)
1766 return;
1767
1768 mod_timer(&query->timer, jiffies);
1769 }
1770
1771 void br_multicast_open(struct net_bridge *br)
1772 {
1773 __br_multicast_open(br, &br->ip4_own_query);
1774 #if IS_ENABLED(CONFIG_IPV6)
1775 __br_multicast_open(br, &br->ip6_own_query);
1776 #endif
1777 }
1778
1779 void br_multicast_stop(struct net_bridge *br)
1780 {
1781 del_timer_sync(&br->multicast_router_timer);
1782 del_timer_sync(&br->ip4_other_query.timer);
1783 del_timer_sync(&br->ip4_own_query.timer);
1784 #if IS_ENABLED(CONFIG_IPV6)
1785 del_timer_sync(&br->ip6_other_query.timer);
1786 del_timer_sync(&br->ip6_own_query.timer);
1787 #endif
1788 }
1789
1790 void br_multicast_dev_del(struct net_bridge *br)
1791 {
1792 struct net_bridge_mdb_htable *mdb;
1793 struct net_bridge_mdb_entry *mp;
1794 struct hlist_node *n;
1795 u32 ver;
1796 int i;
1797
1798 spin_lock_bh(&br->multicast_lock);
1799 mdb = mlock_dereference(br->mdb, br);
1800 if (!mdb)
1801 goto out;
1802
1803 br->mdb = NULL;
1804
1805 ver = mdb->ver;
1806 for (i = 0; i < mdb->max; i++) {
1807 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1808 hlist[ver]) {
1809 del_timer(&mp->timer);
1810 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1811 }
1812 }
1813
1814 if (mdb->old) {
1815 spin_unlock_bh(&br->multicast_lock);
1816 rcu_barrier_bh();
1817 spin_lock_bh(&br->multicast_lock);
1818 WARN_ON(mdb->old);
1819 }
1820
1821 mdb->old = mdb;
1822 call_rcu_bh(&mdb->rcu, br_mdb_free);
1823
1824 out:
1825 spin_unlock_bh(&br->multicast_lock);
1826 }
1827
1828 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1829 {
1830 int err = -EINVAL;
1831
1832 spin_lock_bh(&br->multicast_lock);
1833
1834 switch (val) {
1835 case MDB_RTR_TYPE_DISABLED:
1836 case MDB_RTR_TYPE_PERM:
1837 del_timer(&br->multicast_router_timer);
1838 /* fall through */
1839 case MDB_RTR_TYPE_TEMP_QUERY:
1840 br->multicast_router = val;
1841 err = 0;
1842 break;
1843 }
1844
1845 spin_unlock_bh(&br->multicast_lock);
1846
1847 return err;
1848 }
1849
1850 static void __del_port_router(struct net_bridge_port *p)
1851 {
1852 if (hlist_unhashed(&p->rlist))
1853 return;
1854 hlist_del_init_rcu(&p->rlist);
1855 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1856 }
1857
1858 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1859 {
1860 struct net_bridge *br = p->br;
1861 unsigned long now = jiffies;
1862 int err = -EINVAL;
1863
1864 spin_lock(&br->multicast_lock);
1865 if (p->multicast_router == val) {
1866 /* Refresh the temp router port timer */
1867 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1868 mod_timer(&p->multicast_router_timer,
1869 now + br->multicast_querier_interval);
1870 err = 0;
1871 goto unlock;
1872 }
1873 switch (val) {
1874 case MDB_RTR_TYPE_DISABLED:
1875 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1876 __del_port_router(p);
1877 del_timer(&p->multicast_router_timer);
1878 break;
1879 case MDB_RTR_TYPE_TEMP_QUERY:
1880 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1881 __del_port_router(p);
1882 break;
1883 case MDB_RTR_TYPE_PERM:
1884 p->multicast_router = MDB_RTR_TYPE_PERM;
1885 del_timer(&p->multicast_router_timer);
1886 br_multicast_add_router(br, p);
1887 break;
1888 case MDB_RTR_TYPE_TEMP:
1889 p->multicast_router = MDB_RTR_TYPE_TEMP;
1890 br_multicast_mark_router(br, p);
1891 break;
1892 default:
1893 goto unlock;
1894 }
1895 err = 0;
1896 unlock:
1897 spin_unlock(&br->multicast_lock);
1898
1899 return err;
1900 }
1901
1902 static void br_multicast_start_querier(struct net_bridge *br,
1903 struct bridge_mcast_own_query *query)
1904 {
1905 struct net_bridge_port *port;
1906
1907 __br_multicast_open(br, query);
1908
1909 list_for_each_entry(port, &br->port_list, list) {
1910 if (port->state == BR_STATE_DISABLED ||
1911 port->state == BR_STATE_BLOCKING)
1912 continue;
1913
1914 if (query == &br->ip4_own_query)
1915 br_multicast_enable(&port->ip4_own_query);
1916 #if IS_ENABLED(CONFIG_IPV6)
1917 else
1918 br_multicast_enable(&port->ip6_own_query);
1919 #endif
1920 }
1921 }
1922
1923 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1924 {
1925 int err = 0;
1926 struct net_bridge_mdb_htable *mdb;
1927
1928 spin_lock_bh(&br->multicast_lock);
1929 if (br->multicast_disabled == !val)
1930 goto unlock;
1931
1932 br->multicast_disabled = !val;
1933 if (br->multicast_disabled)
1934 goto unlock;
1935
1936 if (!netif_running(br->dev))
1937 goto unlock;
1938
1939 mdb = mlock_dereference(br->mdb, br);
1940 if (mdb) {
1941 if (mdb->old) {
1942 err = -EEXIST;
1943 rollback:
1944 br->multicast_disabled = !!val;
1945 goto unlock;
1946 }
1947
1948 err = br_mdb_rehash(&br->mdb, mdb->max,
1949 br->hash_elasticity);
1950 if (err)
1951 goto rollback;
1952 }
1953
1954 br_multicast_start_querier(br, &br->ip4_own_query);
1955 #if IS_ENABLED(CONFIG_IPV6)
1956 br_multicast_start_querier(br, &br->ip6_own_query);
1957 #endif
1958
1959 unlock:
1960 spin_unlock_bh(&br->multicast_lock);
1961
1962 return err;
1963 }
1964
1965 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1966 {
1967 unsigned long max_delay;
1968
1969 val = !!val;
1970
1971 spin_lock_bh(&br->multicast_lock);
1972 if (br->multicast_querier == val)
1973 goto unlock;
1974
1975 br->multicast_querier = val;
1976 if (!val)
1977 goto unlock;
1978
1979 max_delay = br->multicast_query_response_interval;
1980
1981 if (!timer_pending(&br->ip4_other_query.timer))
1982 br->ip4_other_query.delay_time = jiffies + max_delay;
1983
1984 br_multicast_start_querier(br, &br->ip4_own_query);
1985
1986 #if IS_ENABLED(CONFIG_IPV6)
1987 if (!timer_pending(&br->ip6_other_query.timer))
1988 br->ip6_other_query.delay_time = jiffies + max_delay;
1989
1990 br_multicast_start_querier(br, &br->ip6_own_query);
1991 #endif
1992
1993 unlock:
1994 spin_unlock_bh(&br->multicast_lock);
1995
1996 return 0;
1997 }
1998
1999 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2000 {
2001 int err = -EINVAL;
2002 u32 old;
2003 struct net_bridge_mdb_htable *mdb;
2004
2005 spin_lock_bh(&br->multicast_lock);
2006 if (!is_power_of_2(val))
2007 goto unlock;
2008
2009 mdb = mlock_dereference(br->mdb, br);
2010 if (mdb && val < mdb->size)
2011 goto unlock;
2012
2013 err = 0;
2014
2015 old = br->hash_max;
2016 br->hash_max = val;
2017
2018 if (mdb) {
2019 if (mdb->old) {
2020 err = -EEXIST;
2021 rollback:
2022 br->hash_max = old;
2023 goto unlock;
2024 }
2025
2026 err = br_mdb_rehash(&br->mdb, br->hash_max,
2027 br->hash_elasticity);
2028 if (err)
2029 goto rollback;
2030 }
2031
2032 unlock:
2033 spin_unlock_bh(&br->multicast_lock);
2034
2035 return err;
2036 }
2037
2038 /**
2039 * br_multicast_list_adjacent - Returns snooped multicast addresses
2040 * @dev: The bridge port adjacent to which to retrieve addresses
2041 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2042 *
2043 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2044 * snooping feature on all bridge ports of dev's bridge device, excluding
2045 * the addresses from dev itself.
2046 *
2047 * Returns the number of items added to br_ip_list.
2048 *
2049 * Notes:
2050 * - br_ip_list needs to be initialized by caller
2051 * - br_ip_list might contain duplicates in the end
2052 * (needs to be taken care of by caller)
2053 * - br_ip_list needs to be freed by caller
2054 */
2055 int br_multicast_list_adjacent(struct net_device *dev,
2056 struct list_head *br_ip_list)
2057 {
2058 struct net_bridge *br;
2059 struct net_bridge_port *port;
2060 struct net_bridge_port_group *group;
2061 struct br_ip_list *entry;
2062 int count = 0;
2063
2064 rcu_read_lock();
2065 if (!br_ip_list || !br_port_exists(dev))
2066 goto unlock;
2067
2068 port = br_port_get_rcu(dev);
2069 if (!port || !port->br)
2070 goto unlock;
2071
2072 br = port->br;
2073
2074 list_for_each_entry_rcu(port, &br->port_list, list) {
2075 if (!port->dev || port->dev == dev)
2076 continue;
2077
2078 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2079 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2080 if (!entry)
2081 goto unlock;
2082
2083 entry->addr = group->addr;
2084 list_add(&entry->list, br_ip_list);
2085 count++;
2086 }
2087 }
2088
2089 unlock:
2090 rcu_read_unlock();
2091 return count;
2092 }
2093 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2094
2095 /**
2096 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2097 * @dev: The bridge port providing the bridge on which to check for a querier
2098 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2099 *
2100 * Checks whether the given interface has a bridge on top and if so returns
2101 * true if a valid querier exists anywhere on the bridged link layer.
2102 * Otherwise returns false.
2103 */
2104 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2105 {
2106 struct net_bridge *br;
2107 struct net_bridge_port *port;
2108 struct ethhdr eth;
2109 bool ret = false;
2110
2111 rcu_read_lock();
2112 if (!br_port_exists(dev))
2113 goto unlock;
2114
2115 port = br_port_get_rcu(dev);
2116 if (!port || !port->br)
2117 goto unlock;
2118
2119 br = port->br;
2120
2121 memset(&eth, 0, sizeof(eth));
2122 eth.h_proto = htons(proto);
2123
2124 ret = br_multicast_querier_exists(br, &eth);
2125
2126 unlock:
2127 rcu_read_unlock();
2128 return ret;
2129 }
2130 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2131
2132 /**
2133 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2134 * @dev: The bridge port adjacent to which to check for a querier
2135 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2136 *
2137 * Checks whether the given interface has a bridge on top and if so returns
2138 * true if a selected querier is behind one of the other ports of this
2139 * bridge. Otherwise returns false.
2140 */
2141 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2142 {
2143 struct net_bridge *br;
2144 struct net_bridge_port *port;
2145 bool ret = false;
2146
2147 rcu_read_lock();
2148 if (!br_port_exists(dev))
2149 goto unlock;
2150
2151 port = br_port_get_rcu(dev);
2152 if (!port || !port->br)
2153 goto unlock;
2154
2155 br = port->br;
2156
2157 switch (proto) {
2158 case ETH_P_IP:
2159 if (!timer_pending(&br->ip4_other_query.timer) ||
2160 rcu_dereference(br->ip4_querier.port) == port)
2161 goto unlock;
2162 break;
2163 #if IS_ENABLED(CONFIG_IPV6)
2164 case ETH_P_IPV6:
2165 if (!timer_pending(&br->ip6_other_query.timer) ||
2166 rcu_dereference(br->ip6_querier.port) == port)
2167 goto unlock;
2168 break;
2169 #endif
2170 default:
2171 goto unlock;
2172 }
2173
2174 ret = true;
2175 unlock:
2176 rcu_read_unlock();
2177 return ret;
2178 }
2179 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
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