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bridge: Restart queries when last querier expires
[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/if_ether.h>
15 #include <linux/igmp.h>
16 #include <linux/jhash.h>
17 #include <linux/kernel.h>
18 #include <linux/log2.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter_bridge.h>
21 #include <linux/random.h>
22 #include <linux/rculist.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
26 #include <net/ip.h>
27 #if IS_ENABLED(CONFIG_IPV6)
28 #include <net/ipv6.h>
29 #include <net/mld.h>
30 #include <net/addrconf.h>
31 #include <net/ip6_checksum.h>
32 #endif
33
34 #include "br_private.h"
35
36 #define mlock_dereference(X, br) \
37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
38
39 static void br_multicast_start_querier(struct net_bridge *br);
40
41 #if IS_ENABLED(CONFIG_IPV6)
42 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
43 {
44 if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
45 return 1;
46 return 0;
47 }
48 #endif
49
50 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
51 {
52 if (a->proto != b->proto)
53 return 0;
54 switch (a->proto) {
55 case htons(ETH_P_IP):
56 return a->u.ip4 == b->u.ip4;
57 #if IS_ENABLED(CONFIG_IPV6)
58 case htons(ETH_P_IPV6):
59 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
60 #endif
61 }
62 return 0;
63 }
64
65 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
66 {
67 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
68 }
69
70 #if IS_ENABLED(CONFIG_IPV6)
71 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
72 const struct in6_addr *ip)
73 {
74 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
75 }
76 #endif
77
78 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
79 struct br_ip *ip)
80 {
81 switch (ip->proto) {
82 case htons(ETH_P_IP):
83 return __br_ip4_hash(mdb, ip->u.ip4);
84 #if IS_ENABLED(CONFIG_IPV6)
85 case htons(ETH_P_IPV6):
86 return __br_ip6_hash(mdb, &ip->u.ip6);
87 #endif
88 }
89 return 0;
90 }
91
92 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
93 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
94 {
95 struct net_bridge_mdb_entry *mp;
96 struct hlist_node *p;
97
98 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
99 if (br_ip_equal(&mp->addr, dst))
100 return mp;
101 }
102
103 return NULL;
104 }
105
106 static struct net_bridge_mdb_entry *br_mdb_ip_get(
107 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
108 {
109 if (!mdb)
110 return NULL;
111
112 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
113 }
114
115 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
116 struct net_bridge_mdb_htable *mdb, __be32 dst)
117 {
118 struct br_ip br_dst;
119
120 br_dst.u.ip4 = dst;
121 br_dst.proto = htons(ETH_P_IP);
122
123 return br_mdb_ip_get(mdb, &br_dst);
124 }
125
126 #if IS_ENABLED(CONFIG_IPV6)
127 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
128 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
129 {
130 struct br_ip br_dst;
131
132 br_dst.u.ip6 = *dst;
133 br_dst.proto = htons(ETH_P_IPV6);
134
135 return br_mdb_ip_get(mdb, &br_dst);
136 }
137 #endif
138
139 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
140 struct sk_buff *skb)
141 {
142 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
143 struct br_ip ip;
144
145 if (br->multicast_disabled)
146 return NULL;
147
148 if (BR_INPUT_SKB_CB(skb)->igmp)
149 return NULL;
150
151 ip.proto = skb->protocol;
152
153 switch (skb->protocol) {
154 case htons(ETH_P_IP):
155 ip.u.ip4 = ip_hdr(skb)->daddr;
156 break;
157 #if IS_ENABLED(CONFIG_IPV6)
158 case htons(ETH_P_IPV6):
159 ip.u.ip6 = ipv6_hdr(skb)->daddr;
160 break;
161 #endif
162 default:
163 return NULL;
164 }
165
166 return br_mdb_ip_get(mdb, &ip);
167 }
168
169 static void br_mdb_free(struct rcu_head *head)
170 {
171 struct net_bridge_mdb_htable *mdb =
172 container_of(head, struct net_bridge_mdb_htable, rcu);
173 struct net_bridge_mdb_htable *old = mdb->old;
174
175 mdb->old = NULL;
176 kfree(old->mhash);
177 kfree(old);
178 }
179
180 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
181 struct net_bridge_mdb_htable *old,
182 int elasticity)
183 {
184 struct net_bridge_mdb_entry *mp;
185 struct hlist_node *p;
186 int maxlen;
187 int len;
188 int i;
189
190 for (i = 0; i < old->max; i++)
191 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
192 hlist_add_head(&mp->hlist[new->ver],
193 &new->mhash[br_ip_hash(new, &mp->addr)]);
194
195 if (!elasticity)
196 return 0;
197
198 maxlen = 0;
199 for (i = 0; i < new->max; i++) {
200 len = 0;
201 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
202 len++;
203 if (len > maxlen)
204 maxlen = len;
205 }
206
207 return maxlen > elasticity ? -EINVAL : 0;
208 }
209
210 static void br_multicast_free_pg(struct rcu_head *head)
211 {
212 struct net_bridge_port_group *p =
213 container_of(head, struct net_bridge_port_group, rcu);
214
215 kfree(p);
216 }
217
218 static void br_multicast_free_group(struct rcu_head *head)
219 {
220 struct net_bridge_mdb_entry *mp =
221 container_of(head, struct net_bridge_mdb_entry, rcu);
222
223 kfree(mp);
224 }
225
226 static void br_multicast_group_expired(unsigned long data)
227 {
228 struct net_bridge_mdb_entry *mp = (void *)data;
229 struct net_bridge *br = mp->br;
230 struct net_bridge_mdb_htable *mdb;
231
232 spin_lock(&br->multicast_lock);
233 if (!netif_running(br->dev) || timer_pending(&mp->timer))
234 goto out;
235
236 mp->mglist = false;
237
238 if (mp->ports)
239 goto out;
240
241 mdb = mlock_dereference(br->mdb, br);
242
243 hlist_del_rcu(&mp->hlist[mdb->ver]);
244 mdb->size--;
245
246 call_rcu_bh(&mp->rcu, br_multicast_free_group);
247
248 out:
249 spin_unlock(&br->multicast_lock);
250 }
251
252 static void br_multicast_del_pg(struct net_bridge *br,
253 struct net_bridge_port_group *pg)
254 {
255 struct net_bridge_mdb_htable *mdb;
256 struct net_bridge_mdb_entry *mp;
257 struct net_bridge_port_group *p;
258 struct net_bridge_port_group __rcu **pp;
259
260 mdb = mlock_dereference(br->mdb, br);
261
262 mp = br_mdb_ip_get(mdb, &pg->addr);
263 if (WARN_ON(!mp))
264 return;
265
266 for (pp = &mp->ports;
267 (p = mlock_dereference(*pp, br)) != NULL;
268 pp = &p->next) {
269 if (p != pg)
270 continue;
271
272 rcu_assign_pointer(*pp, p->next);
273 hlist_del_init(&p->mglist);
274 del_timer(&p->timer);
275 call_rcu_bh(&p->rcu, br_multicast_free_pg);
276
277 if (!mp->ports && !mp->mglist &&
278 netif_running(br->dev))
279 mod_timer(&mp->timer, jiffies);
280
281 return;
282 }
283
284 WARN_ON(1);
285 }
286
287 static void br_multicast_port_group_expired(unsigned long data)
288 {
289 struct net_bridge_port_group *pg = (void *)data;
290 struct net_bridge *br = pg->port->br;
291
292 spin_lock(&br->multicast_lock);
293 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
294 hlist_unhashed(&pg->mglist))
295 goto out;
296
297 br_multicast_del_pg(br, pg);
298
299 out:
300 spin_unlock(&br->multicast_lock);
301 }
302
303 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
304 int elasticity)
305 {
306 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
307 struct net_bridge_mdb_htable *mdb;
308 int err;
309
310 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
311 if (!mdb)
312 return -ENOMEM;
313
314 mdb->max = max;
315 mdb->old = old;
316
317 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
318 if (!mdb->mhash) {
319 kfree(mdb);
320 return -ENOMEM;
321 }
322
323 mdb->size = old ? old->size : 0;
324 mdb->ver = old ? old->ver ^ 1 : 0;
325
326 if (!old || elasticity)
327 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
328 else
329 mdb->secret = old->secret;
330
331 if (!old)
332 goto out;
333
334 err = br_mdb_copy(mdb, old, elasticity);
335 if (err) {
336 kfree(mdb->mhash);
337 kfree(mdb);
338 return err;
339 }
340
341 call_rcu_bh(&mdb->rcu, br_mdb_free);
342
343 out:
344 rcu_assign_pointer(*mdbp, mdb);
345
346 return 0;
347 }
348
349 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
350 __be32 group)
351 {
352 struct sk_buff *skb;
353 struct igmphdr *ih;
354 struct ethhdr *eth;
355 struct iphdr *iph;
356
357 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
358 sizeof(*ih) + 4);
359 if (!skb)
360 goto out;
361
362 skb->protocol = htons(ETH_P_IP);
363
364 skb_reset_mac_header(skb);
365 eth = eth_hdr(skb);
366
367 memcpy(eth->h_source, br->dev->dev_addr, 6);
368 eth->h_dest[0] = 1;
369 eth->h_dest[1] = 0;
370 eth->h_dest[2] = 0x5e;
371 eth->h_dest[3] = 0;
372 eth->h_dest[4] = 0;
373 eth->h_dest[5] = 1;
374 eth->h_proto = htons(ETH_P_IP);
375 skb_put(skb, sizeof(*eth));
376
377 skb_set_network_header(skb, skb->len);
378 iph = ip_hdr(skb);
379
380 iph->version = 4;
381 iph->ihl = 6;
382 iph->tos = 0xc0;
383 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
384 iph->id = 0;
385 iph->frag_off = htons(IP_DF);
386 iph->ttl = 1;
387 iph->protocol = IPPROTO_IGMP;
388 iph->saddr = 0;
389 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
390 ((u8 *)&iph[1])[0] = IPOPT_RA;
391 ((u8 *)&iph[1])[1] = 4;
392 ((u8 *)&iph[1])[2] = 0;
393 ((u8 *)&iph[1])[3] = 0;
394 ip_send_check(iph);
395 skb_put(skb, 24);
396
397 skb_set_transport_header(skb, skb->len);
398 ih = igmp_hdr(skb);
399 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
400 ih->code = (group ? br->multicast_last_member_interval :
401 br->multicast_query_response_interval) /
402 (HZ / IGMP_TIMER_SCALE);
403 ih->group = group;
404 ih->csum = 0;
405 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
406 skb_put(skb, sizeof(*ih));
407
408 __skb_pull(skb, sizeof(*eth));
409
410 out:
411 return skb;
412 }
413
414 #if IS_ENABLED(CONFIG_IPV6)
415 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
416 const struct in6_addr *group)
417 {
418 struct sk_buff *skb;
419 struct ipv6hdr *ip6h;
420 struct mld_msg *mldq;
421 struct ethhdr *eth;
422 u8 *hopopt;
423 unsigned long interval;
424
425 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
426 8 + sizeof(*mldq));
427 if (!skb)
428 goto out;
429
430 skb->protocol = htons(ETH_P_IPV6);
431
432 /* Ethernet header */
433 skb_reset_mac_header(skb);
434 eth = eth_hdr(skb);
435
436 memcpy(eth->h_source, br->dev->dev_addr, 6);
437 eth->h_proto = htons(ETH_P_IPV6);
438 skb_put(skb, sizeof(*eth));
439
440 /* IPv6 header + HbH option */
441 skb_set_network_header(skb, skb->len);
442 ip6h = ipv6_hdr(skb);
443
444 *(__force __be32 *)ip6h = htonl(0x60000000);
445 ip6h->payload_len = htons(8 + sizeof(*mldq));
446 ip6h->nexthdr = IPPROTO_HOPOPTS;
447 ip6h->hop_limit = 1;
448 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
449 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
450 &ip6h->saddr)) {
451 kfree_skb(skb);
452 return NULL;
453 }
454 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
455
456 hopopt = (u8 *)(ip6h + 1);
457 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
458 hopopt[1] = 0; /* length of HbH */
459 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
460 hopopt[3] = 2; /* Length of RA Option */
461 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
462 hopopt[5] = 0;
463 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */
464 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */
465
466 skb_put(skb, sizeof(*ip6h) + 8);
467
468 /* ICMPv6 */
469 skb_set_transport_header(skb, skb->len);
470 mldq = (struct mld_msg *) icmp6_hdr(skb);
471
472 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
473 br->multicast_query_response_interval;
474
475 mldq->mld_type = ICMPV6_MGM_QUERY;
476 mldq->mld_code = 0;
477 mldq->mld_cksum = 0;
478 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
479 mldq->mld_reserved = 0;
480 mldq->mld_mca = *group;
481
482 /* checksum */
483 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
484 sizeof(*mldq), IPPROTO_ICMPV6,
485 csum_partial(mldq,
486 sizeof(*mldq), 0));
487 skb_put(skb, sizeof(*mldq));
488
489 __skb_pull(skb, sizeof(*eth));
490
491 out:
492 return skb;
493 }
494 #endif
495
496 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
497 struct br_ip *addr)
498 {
499 switch (addr->proto) {
500 case htons(ETH_P_IP):
501 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
502 #if IS_ENABLED(CONFIG_IPV6)
503 case htons(ETH_P_IPV6):
504 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
505 #endif
506 }
507 return NULL;
508 }
509
510 static struct net_bridge_mdb_entry *br_multicast_get_group(
511 struct net_bridge *br, struct net_bridge_port *port,
512 struct br_ip *group, int hash)
513 {
514 struct net_bridge_mdb_htable *mdb;
515 struct net_bridge_mdb_entry *mp;
516 struct hlist_node *p;
517 unsigned int count = 0;
518 unsigned int max;
519 int elasticity;
520 int err;
521
522 mdb = rcu_dereference_protected(br->mdb, 1);
523 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
524 count++;
525 if (unlikely(br_ip_equal(group, &mp->addr)))
526 return mp;
527 }
528
529 elasticity = 0;
530 max = mdb->max;
531
532 if (unlikely(count > br->hash_elasticity && count)) {
533 if (net_ratelimit())
534 br_info(br, "Multicast hash table "
535 "chain limit reached: %s\n",
536 port ? port->dev->name : br->dev->name);
537
538 elasticity = br->hash_elasticity;
539 }
540
541 if (mdb->size >= max) {
542 max *= 2;
543 if (unlikely(max >= br->hash_max)) {
544 br_warn(br, "Multicast hash table maximum "
545 "reached, disabling snooping: %s, %d\n",
546 port ? port->dev->name : br->dev->name, max);
547 err = -E2BIG;
548 disable:
549 br->multicast_disabled = 1;
550 goto err;
551 }
552 }
553
554 if (max > mdb->max || elasticity) {
555 if (mdb->old) {
556 if (net_ratelimit())
557 br_info(br, "Multicast hash table "
558 "on fire: %s\n",
559 port ? port->dev->name : br->dev->name);
560 err = -EEXIST;
561 goto err;
562 }
563
564 err = br_mdb_rehash(&br->mdb, max, elasticity);
565 if (err) {
566 br_warn(br, "Cannot rehash multicast "
567 "hash table, disabling snooping: %s, %d, %d\n",
568 port ? port->dev->name : br->dev->name,
569 mdb->size, err);
570 goto disable;
571 }
572
573 err = -EAGAIN;
574 goto err;
575 }
576
577 return NULL;
578
579 err:
580 mp = ERR_PTR(err);
581 return mp;
582 }
583
584 static struct net_bridge_mdb_entry *br_multicast_new_group(
585 struct net_bridge *br, struct net_bridge_port *port,
586 struct br_ip *group)
587 {
588 struct net_bridge_mdb_htable *mdb;
589 struct net_bridge_mdb_entry *mp;
590 int hash;
591 int err;
592
593 mdb = rcu_dereference_protected(br->mdb, 1);
594 if (!mdb) {
595 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
596 if (err)
597 return ERR_PTR(err);
598 goto rehash;
599 }
600
601 hash = br_ip_hash(mdb, group);
602 mp = br_multicast_get_group(br, port, group, hash);
603 switch (PTR_ERR(mp)) {
604 case 0:
605 break;
606
607 case -EAGAIN:
608 rehash:
609 mdb = rcu_dereference_protected(br->mdb, 1);
610 hash = br_ip_hash(mdb, group);
611 break;
612
613 default:
614 goto out;
615 }
616
617 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
618 if (unlikely(!mp))
619 return ERR_PTR(-ENOMEM);
620
621 mp->br = br;
622 mp->addr = *group;
623 setup_timer(&mp->timer, br_multicast_group_expired,
624 (unsigned long)mp);
625
626 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
627 mdb->size++;
628
629 out:
630 return mp;
631 }
632
633 static int br_multicast_add_group(struct net_bridge *br,
634 struct net_bridge_port *port,
635 struct br_ip *group)
636 {
637 struct net_bridge_mdb_entry *mp;
638 struct net_bridge_port_group *p;
639 struct net_bridge_port_group __rcu **pp;
640 unsigned long now = jiffies;
641 int err;
642
643 spin_lock(&br->multicast_lock);
644 if (!netif_running(br->dev) ||
645 (port && port->state == BR_STATE_DISABLED))
646 goto out;
647
648 mp = br_multicast_new_group(br, port, group);
649 err = PTR_ERR(mp);
650 if (IS_ERR(mp))
651 goto err;
652
653 if (!port) {
654 mp->mglist = true;
655 mod_timer(&mp->timer, now + br->multicast_membership_interval);
656 goto out;
657 }
658
659 for (pp = &mp->ports;
660 (p = mlock_dereference(*pp, br)) != NULL;
661 pp = &p->next) {
662 if (p->port == port)
663 goto found;
664 if ((unsigned long)p->port < (unsigned long)port)
665 break;
666 }
667
668 p = kzalloc(sizeof(*p), GFP_ATOMIC);
669 err = -ENOMEM;
670 if (unlikely(!p))
671 goto err;
672
673 p->addr = *group;
674 p->port = port;
675 p->next = *pp;
676 hlist_add_head(&p->mglist, &port->mglist);
677 setup_timer(&p->timer, br_multicast_port_group_expired,
678 (unsigned long)p);
679
680 rcu_assign_pointer(*pp, p);
681
682 found:
683 mod_timer(&p->timer, now + br->multicast_membership_interval);
684 out:
685 err = 0;
686
687 err:
688 spin_unlock(&br->multicast_lock);
689 return err;
690 }
691
692 static int br_ip4_multicast_add_group(struct net_bridge *br,
693 struct net_bridge_port *port,
694 __be32 group)
695 {
696 struct br_ip br_group;
697
698 if (ipv4_is_local_multicast(group))
699 return 0;
700
701 br_group.u.ip4 = group;
702 br_group.proto = htons(ETH_P_IP);
703
704 return br_multicast_add_group(br, port, &br_group);
705 }
706
707 #if IS_ENABLED(CONFIG_IPV6)
708 static int br_ip6_multicast_add_group(struct net_bridge *br,
709 struct net_bridge_port *port,
710 const struct in6_addr *group)
711 {
712 struct br_ip br_group;
713
714 if (!ipv6_is_transient_multicast(group))
715 return 0;
716
717 br_group.u.ip6 = *group;
718 br_group.proto = htons(ETH_P_IPV6);
719
720 return br_multicast_add_group(br, port, &br_group);
721 }
722 #endif
723
724 static void br_multicast_router_expired(unsigned long data)
725 {
726 struct net_bridge_port *port = (void *)data;
727 struct net_bridge *br = port->br;
728
729 spin_lock(&br->multicast_lock);
730 if (port->multicast_router != 1 ||
731 timer_pending(&port->multicast_router_timer) ||
732 hlist_unhashed(&port->rlist))
733 goto out;
734
735 hlist_del_init_rcu(&port->rlist);
736
737 out:
738 spin_unlock(&br->multicast_lock);
739 }
740
741 static void br_multicast_local_router_expired(unsigned long data)
742 {
743 }
744
745 static void br_multicast_querier_expired(unsigned long data)
746 {
747 struct net_bridge_port *port = (void *)data;
748 struct net_bridge *br = port->br;
749
750 spin_lock(&br->multicast_lock);
751 if (!netif_running(br->dev) || br->multicast_disabled)
752 goto out;
753
754 br_multicast_start_querier(br);
755
756 out:
757 spin_unlock(&br->multicast_lock);
758 }
759
760 static void __br_multicast_send_query(struct net_bridge *br,
761 struct net_bridge_port *port,
762 struct br_ip *ip)
763 {
764 struct sk_buff *skb;
765
766 skb = br_multicast_alloc_query(br, ip);
767 if (!skb)
768 return;
769
770 if (port) {
771 __skb_push(skb, sizeof(struct ethhdr));
772 skb->dev = port->dev;
773 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
774 dev_queue_xmit);
775 } else
776 netif_rx(skb);
777 }
778
779 static void br_multicast_send_query(struct net_bridge *br,
780 struct net_bridge_port *port, u32 sent)
781 {
782 unsigned long time;
783 struct br_ip br_group;
784
785 if (!netif_running(br->dev) || br->multicast_disabled ||
786 timer_pending(&br->multicast_querier_timer))
787 return;
788
789 memset(&br_group.u, 0, sizeof(br_group.u));
790
791 br_group.proto = htons(ETH_P_IP);
792 __br_multicast_send_query(br, port, &br_group);
793
794 #if IS_ENABLED(CONFIG_IPV6)
795 br_group.proto = htons(ETH_P_IPV6);
796 __br_multicast_send_query(br, port, &br_group);
797 #endif
798
799 time = jiffies;
800 time += sent < br->multicast_startup_query_count ?
801 br->multicast_startup_query_interval :
802 br->multicast_query_interval;
803 mod_timer(port ? &port->multicast_query_timer :
804 &br->multicast_query_timer, time);
805 }
806
807 static void br_multicast_port_query_expired(unsigned long data)
808 {
809 struct net_bridge_port *port = (void *)data;
810 struct net_bridge *br = port->br;
811
812 spin_lock(&br->multicast_lock);
813 if (port->state == BR_STATE_DISABLED ||
814 port->state == BR_STATE_BLOCKING)
815 goto out;
816
817 if (port->multicast_startup_queries_sent <
818 br->multicast_startup_query_count)
819 port->multicast_startup_queries_sent++;
820
821 br_multicast_send_query(port->br, port,
822 port->multicast_startup_queries_sent);
823
824 out:
825 spin_unlock(&br->multicast_lock);
826 }
827
828 void br_multicast_add_port(struct net_bridge_port *port)
829 {
830 port->multicast_router = 1;
831
832 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
833 (unsigned long)port);
834 setup_timer(&port->multicast_query_timer,
835 br_multicast_port_query_expired, (unsigned long)port);
836 }
837
838 void br_multicast_del_port(struct net_bridge_port *port)
839 {
840 del_timer_sync(&port->multicast_router_timer);
841 }
842
843 static void __br_multicast_enable_port(struct net_bridge_port *port)
844 {
845 port->multicast_startup_queries_sent = 0;
846
847 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
848 del_timer(&port->multicast_query_timer))
849 mod_timer(&port->multicast_query_timer, jiffies);
850 }
851
852 void br_multicast_enable_port(struct net_bridge_port *port)
853 {
854 struct net_bridge *br = port->br;
855
856 spin_lock(&br->multicast_lock);
857 if (br->multicast_disabled || !netif_running(br->dev))
858 goto out;
859
860 __br_multicast_enable_port(port);
861
862 out:
863 spin_unlock(&br->multicast_lock);
864 }
865
866 void br_multicast_disable_port(struct net_bridge_port *port)
867 {
868 struct net_bridge *br = port->br;
869 struct net_bridge_port_group *pg;
870 struct hlist_node *p, *n;
871
872 spin_lock(&br->multicast_lock);
873 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
874 br_multicast_del_pg(br, pg);
875
876 if (!hlist_unhashed(&port->rlist))
877 hlist_del_init_rcu(&port->rlist);
878 del_timer(&port->multicast_router_timer);
879 del_timer(&port->multicast_query_timer);
880 spin_unlock(&br->multicast_lock);
881 }
882
883 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
884 struct net_bridge_port *port,
885 struct sk_buff *skb)
886 {
887 struct igmpv3_report *ih;
888 struct igmpv3_grec *grec;
889 int i;
890 int len;
891 int num;
892 int type;
893 int err = 0;
894 __be32 group;
895
896 if (!pskb_may_pull(skb, sizeof(*ih)))
897 return -EINVAL;
898
899 ih = igmpv3_report_hdr(skb);
900 num = ntohs(ih->ngrec);
901 len = sizeof(*ih);
902
903 for (i = 0; i < num; i++) {
904 len += sizeof(*grec);
905 if (!pskb_may_pull(skb, len))
906 return -EINVAL;
907
908 grec = (void *)(skb->data + len - sizeof(*grec));
909 group = grec->grec_mca;
910 type = grec->grec_type;
911
912 len += ntohs(grec->grec_nsrcs) * 4;
913 if (!pskb_may_pull(skb, len))
914 return -EINVAL;
915
916 /* We treat this as an IGMPv2 report for now. */
917 switch (type) {
918 case IGMPV3_MODE_IS_INCLUDE:
919 case IGMPV3_MODE_IS_EXCLUDE:
920 case IGMPV3_CHANGE_TO_INCLUDE:
921 case IGMPV3_CHANGE_TO_EXCLUDE:
922 case IGMPV3_ALLOW_NEW_SOURCES:
923 case IGMPV3_BLOCK_OLD_SOURCES:
924 break;
925
926 default:
927 continue;
928 }
929
930 err = br_ip4_multicast_add_group(br, port, group);
931 if (err)
932 break;
933 }
934
935 return err;
936 }
937
938 #if IS_ENABLED(CONFIG_IPV6)
939 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
940 struct net_bridge_port *port,
941 struct sk_buff *skb)
942 {
943 struct icmp6hdr *icmp6h;
944 struct mld2_grec *grec;
945 int i;
946 int len;
947 int num;
948 int err = 0;
949
950 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
951 return -EINVAL;
952
953 icmp6h = icmp6_hdr(skb);
954 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
955 len = sizeof(*icmp6h);
956
957 for (i = 0; i < num; i++) {
958 __be16 *nsrcs, _nsrcs;
959
960 nsrcs = skb_header_pointer(skb,
961 len + offsetof(struct mld2_grec,
962 grec_nsrcs),
963 sizeof(_nsrcs), &_nsrcs);
964 if (!nsrcs)
965 return -EINVAL;
966
967 if (!pskb_may_pull(skb,
968 len + sizeof(*grec) +
969 sizeof(struct in6_addr) * ntohs(*nsrcs)))
970 return -EINVAL;
971
972 grec = (struct mld2_grec *)(skb->data + len);
973 len += sizeof(*grec) +
974 sizeof(struct in6_addr) * ntohs(*nsrcs);
975
976 /* We treat these as MLDv1 reports for now. */
977 switch (grec->grec_type) {
978 case MLD2_MODE_IS_INCLUDE:
979 case MLD2_MODE_IS_EXCLUDE:
980 case MLD2_CHANGE_TO_INCLUDE:
981 case MLD2_CHANGE_TO_EXCLUDE:
982 case MLD2_ALLOW_NEW_SOURCES:
983 case MLD2_BLOCK_OLD_SOURCES:
984 break;
985
986 default:
987 continue;
988 }
989
990 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
991 if (!err)
992 break;
993 }
994
995 return err;
996 }
997 #endif
998
999 /*
1000 * Add port to rotuer_list
1001 * list is maintained ordered by pointer value
1002 * and locked by br->multicast_lock and RCU
1003 */
1004 static void br_multicast_add_router(struct net_bridge *br,
1005 struct net_bridge_port *port)
1006 {
1007 struct net_bridge_port *p;
1008 struct hlist_node *n, *slot = NULL;
1009
1010 hlist_for_each_entry(p, n, &br->router_list, rlist) {
1011 if ((unsigned long) port >= (unsigned long) p)
1012 break;
1013 slot = n;
1014 }
1015
1016 if (slot)
1017 hlist_add_after_rcu(slot, &port->rlist);
1018 else
1019 hlist_add_head_rcu(&port->rlist, &br->router_list);
1020 }
1021
1022 static void br_multicast_mark_router(struct net_bridge *br,
1023 struct net_bridge_port *port)
1024 {
1025 unsigned long now = jiffies;
1026
1027 if (!port) {
1028 if (br->multicast_router == 1)
1029 mod_timer(&br->multicast_router_timer,
1030 now + br->multicast_querier_interval);
1031 return;
1032 }
1033
1034 if (port->multicast_router != 1)
1035 return;
1036
1037 if (!hlist_unhashed(&port->rlist))
1038 goto timer;
1039
1040 br_multicast_add_router(br, port);
1041
1042 timer:
1043 mod_timer(&port->multicast_router_timer,
1044 now + br->multicast_querier_interval);
1045 }
1046
1047 static void br_multicast_query_received(struct net_bridge *br,
1048 struct net_bridge_port *port,
1049 int saddr)
1050 {
1051 if (saddr)
1052 mod_timer(&br->multicast_querier_timer,
1053 jiffies + br->multicast_querier_interval);
1054 else if (timer_pending(&br->multicast_querier_timer))
1055 return;
1056
1057 br_multicast_mark_router(br, port);
1058 }
1059
1060 static int br_ip4_multicast_query(struct net_bridge *br,
1061 struct net_bridge_port *port,
1062 struct sk_buff *skb)
1063 {
1064 const struct iphdr *iph = ip_hdr(skb);
1065 struct igmphdr *ih = igmp_hdr(skb);
1066 struct net_bridge_mdb_entry *mp;
1067 struct igmpv3_query *ih3;
1068 struct net_bridge_port_group *p;
1069 struct net_bridge_port_group __rcu **pp;
1070 unsigned long max_delay;
1071 unsigned long now = jiffies;
1072 __be32 group;
1073 int err = 0;
1074
1075 spin_lock(&br->multicast_lock);
1076 if (!netif_running(br->dev) ||
1077 (port && port->state == BR_STATE_DISABLED))
1078 goto out;
1079
1080 br_multicast_query_received(br, port, !!iph->saddr);
1081
1082 group = ih->group;
1083
1084 if (skb->len == sizeof(*ih)) {
1085 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1086
1087 if (!max_delay) {
1088 max_delay = 10 * HZ;
1089 group = 0;
1090 }
1091 } else {
1092 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1093 err = -EINVAL;
1094 goto out;
1095 }
1096
1097 ih3 = igmpv3_query_hdr(skb);
1098 if (ih3->nsrcs)
1099 goto out;
1100
1101 max_delay = ih3->code ?
1102 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1103 }
1104
1105 if (!group)
1106 goto out;
1107
1108 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
1109 if (!mp)
1110 goto out;
1111
1112 max_delay *= br->multicast_last_member_count;
1113
1114 if (mp->mglist &&
1115 (timer_pending(&mp->timer) ?
1116 time_after(mp->timer.expires, now + max_delay) :
1117 try_to_del_timer_sync(&mp->timer) >= 0))
1118 mod_timer(&mp->timer, now + max_delay);
1119
1120 for (pp = &mp->ports;
1121 (p = mlock_dereference(*pp, br)) != NULL;
1122 pp = &p->next) {
1123 if (timer_pending(&p->timer) ?
1124 time_after(p->timer.expires, now + max_delay) :
1125 try_to_del_timer_sync(&p->timer) >= 0)
1126 mod_timer(&p->timer, now + max_delay);
1127 }
1128
1129 out:
1130 spin_unlock(&br->multicast_lock);
1131 return err;
1132 }
1133
1134 #if IS_ENABLED(CONFIG_IPV6)
1135 static int br_ip6_multicast_query(struct net_bridge *br,
1136 struct net_bridge_port *port,
1137 struct sk_buff *skb)
1138 {
1139 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1140 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1141 struct net_bridge_mdb_entry *mp;
1142 struct mld2_query *mld2q;
1143 struct net_bridge_port_group *p;
1144 struct net_bridge_port_group __rcu **pp;
1145 unsigned long max_delay;
1146 unsigned long now = jiffies;
1147 const struct in6_addr *group = NULL;
1148 int err = 0;
1149
1150 spin_lock(&br->multicast_lock);
1151 if (!netif_running(br->dev) ||
1152 (port && port->state == BR_STATE_DISABLED))
1153 goto out;
1154
1155 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1156
1157 if (skb->len == sizeof(*mld)) {
1158 if (!pskb_may_pull(skb, sizeof(*mld))) {
1159 err = -EINVAL;
1160 goto out;
1161 }
1162 mld = (struct mld_msg *) icmp6_hdr(skb);
1163 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
1164 if (max_delay)
1165 group = &mld->mld_mca;
1166 } else if (skb->len >= sizeof(*mld2q)) {
1167 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1168 err = -EINVAL;
1169 goto out;
1170 }
1171 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1172 if (!mld2q->mld2q_nsrcs)
1173 group = &mld2q->mld2q_mca;
1174 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1175 }
1176
1177 if (!group)
1178 goto out;
1179
1180 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
1181 if (!mp)
1182 goto out;
1183
1184 max_delay *= br->multicast_last_member_count;
1185 if (mp->mglist &&
1186 (timer_pending(&mp->timer) ?
1187 time_after(mp->timer.expires, now + max_delay) :
1188 try_to_del_timer_sync(&mp->timer) >= 0))
1189 mod_timer(&mp->timer, now + max_delay);
1190
1191 for (pp = &mp->ports;
1192 (p = mlock_dereference(*pp, br)) != NULL;
1193 pp = &p->next) {
1194 if (timer_pending(&p->timer) ?
1195 time_after(p->timer.expires, now + max_delay) :
1196 try_to_del_timer_sync(&p->timer) >= 0)
1197 mod_timer(&p->timer, now + max_delay);
1198 }
1199
1200 out:
1201 spin_unlock(&br->multicast_lock);
1202 return err;
1203 }
1204 #endif
1205
1206 static void br_multicast_leave_group(struct net_bridge *br,
1207 struct net_bridge_port *port,
1208 struct br_ip *group)
1209 {
1210 struct net_bridge_mdb_htable *mdb;
1211 struct net_bridge_mdb_entry *mp;
1212 struct net_bridge_port_group *p;
1213 unsigned long now;
1214 unsigned long time;
1215
1216 spin_lock(&br->multicast_lock);
1217 if (!netif_running(br->dev) ||
1218 (port && port->state == BR_STATE_DISABLED) ||
1219 timer_pending(&br->multicast_querier_timer))
1220 goto out;
1221
1222 mdb = mlock_dereference(br->mdb, br);
1223 mp = br_mdb_ip_get(mdb, group);
1224 if (!mp)
1225 goto out;
1226
1227 now = jiffies;
1228 time = now + br->multicast_last_member_count *
1229 br->multicast_last_member_interval;
1230
1231 if (!port) {
1232 if (mp->mglist &&
1233 (timer_pending(&mp->timer) ?
1234 time_after(mp->timer.expires, time) :
1235 try_to_del_timer_sync(&mp->timer) >= 0)) {
1236 mod_timer(&mp->timer, time);
1237 }
1238
1239 goto out;
1240 }
1241
1242 for (p = mlock_dereference(mp->ports, br);
1243 p != NULL;
1244 p = mlock_dereference(p->next, br)) {
1245 if (p->port != port)
1246 continue;
1247
1248 if (!hlist_unhashed(&p->mglist) &&
1249 (timer_pending(&p->timer) ?
1250 time_after(p->timer.expires, time) :
1251 try_to_del_timer_sync(&p->timer) >= 0)) {
1252 mod_timer(&p->timer, time);
1253 }
1254
1255 break;
1256 }
1257
1258 out:
1259 spin_unlock(&br->multicast_lock);
1260 }
1261
1262 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1263 struct net_bridge_port *port,
1264 __be32 group)
1265 {
1266 struct br_ip br_group;
1267
1268 if (ipv4_is_local_multicast(group))
1269 return;
1270
1271 br_group.u.ip4 = group;
1272 br_group.proto = htons(ETH_P_IP);
1273
1274 br_multicast_leave_group(br, port, &br_group);
1275 }
1276
1277 #if IS_ENABLED(CONFIG_IPV6)
1278 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1279 struct net_bridge_port *port,
1280 const struct in6_addr *group)
1281 {
1282 struct br_ip br_group;
1283
1284 if (!ipv6_is_transient_multicast(group))
1285 return;
1286
1287 br_group.u.ip6 = *group;
1288 br_group.proto = htons(ETH_P_IPV6);
1289
1290 br_multicast_leave_group(br, port, &br_group);
1291 }
1292 #endif
1293
1294 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1295 struct net_bridge_port *port,
1296 struct sk_buff *skb)
1297 {
1298 struct sk_buff *skb2 = skb;
1299 const struct iphdr *iph;
1300 struct igmphdr *ih;
1301 unsigned int len;
1302 unsigned int offset;
1303 int err;
1304
1305 /* We treat OOM as packet loss for now. */
1306 if (!pskb_may_pull(skb, sizeof(*iph)))
1307 return -EINVAL;
1308
1309 iph = ip_hdr(skb);
1310
1311 if (iph->ihl < 5 || iph->version != 4)
1312 return -EINVAL;
1313
1314 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1315 return -EINVAL;
1316
1317 iph = ip_hdr(skb);
1318
1319 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1320 return -EINVAL;
1321
1322 if (iph->protocol != IPPROTO_IGMP) {
1323 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
1324 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1325 return 0;
1326 }
1327
1328 len = ntohs(iph->tot_len);
1329 if (skb->len < len || len < ip_hdrlen(skb))
1330 return -EINVAL;
1331
1332 if (skb->len > len) {
1333 skb2 = skb_clone(skb, GFP_ATOMIC);
1334 if (!skb2)
1335 return -ENOMEM;
1336
1337 err = pskb_trim_rcsum(skb2, len);
1338 if (err)
1339 goto err_out;
1340 }
1341
1342 len -= ip_hdrlen(skb2);
1343 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1344 __skb_pull(skb2, offset);
1345 skb_reset_transport_header(skb2);
1346
1347 err = -EINVAL;
1348 if (!pskb_may_pull(skb2, sizeof(*ih)))
1349 goto out;
1350
1351 switch (skb2->ip_summed) {
1352 case CHECKSUM_COMPLETE:
1353 if (!csum_fold(skb2->csum))
1354 break;
1355 /* fall through */
1356 case CHECKSUM_NONE:
1357 skb2->csum = 0;
1358 if (skb_checksum_complete(skb2))
1359 goto out;
1360 }
1361
1362 err = 0;
1363
1364 BR_INPUT_SKB_CB(skb)->igmp = 1;
1365 ih = igmp_hdr(skb2);
1366
1367 switch (ih->type) {
1368 case IGMP_HOST_MEMBERSHIP_REPORT:
1369 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1370 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1371 err = br_ip4_multicast_add_group(br, port, ih->group);
1372 break;
1373 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1374 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1375 break;
1376 case IGMP_HOST_MEMBERSHIP_QUERY:
1377 err = br_ip4_multicast_query(br, port, skb2);
1378 break;
1379 case IGMP_HOST_LEAVE_MESSAGE:
1380 br_ip4_multicast_leave_group(br, port, ih->group);
1381 break;
1382 }
1383
1384 out:
1385 __skb_push(skb2, offset);
1386 err_out:
1387 if (skb2 != skb)
1388 kfree_skb(skb2);
1389 return err;
1390 }
1391
1392 #if IS_ENABLED(CONFIG_IPV6)
1393 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1394 struct net_bridge_port *port,
1395 struct sk_buff *skb)
1396 {
1397 struct sk_buff *skb2;
1398 const struct ipv6hdr *ip6h;
1399 u8 icmp6_type;
1400 u8 nexthdr;
1401 __be16 frag_off;
1402 unsigned int len;
1403 int offset;
1404 int err;
1405
1406 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1407 return -EINVAL;
1408
1409 ip6h = ipv6_hdr(skb);
1410
1411 /*
1412 * We're interested in MLD messages only.
1413 * - Version is 6
1414 * - MLD has always Router Alert hop-by-hop option
1415 * - But we do not support jumbrograms.
1416 */
1417 if (ip6h->version != 6 ||
1418 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1419 ip6h->payload_len == 0)
1420 return 0;
1421
1422 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1423 if (skb->len < len)
1424 return -EINVAL;
1425
1426 nexthdr = ip6h->nexthdr;
1427 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1428
1429 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1430 return 0;
1431
1432 /* Okay, we found ICMPv6 header */
1433 skb2 = skb_clone(skb, GFP_ATOMIC);
1434 if (!skb2)
1435 return -ENOMEM;
1436
1437 err = -EINVAL;
1438 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1439 goto out;
1440
1441 len -= offset - skb_network_offset(skb2);
1442
1443 __skb_pull(skb2, offset);
1444 skb_reset_transport_header(skb2);
1445 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1446 skb_network_header_len(skb2));
1447
1448 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1449
1450 switch (icmp6_type) {
1451 case ICMPV6_MGM_QUERY:
1452 case ICMPV6_MGM_REPORT:
1453 case ICMPV6_MGM_REDUCTION:
1454 case ICMPV6_MLD2_REPORT:
1455 break;
1456 default:
1457 err = 0;
1458 goto out;
1459 }
1460
1461 /* Okay, we found MLD message. Check further. */
1462 if (skb2->len > len) {
1463 err = pskb_trim_rcsum(skb2, len);
1464 if (err)
1465 goto out;
1466 err = -EINVAL;
1467 }
1468
1469 ip6h = ipv6_hdr(skb2);
1470
1471 switch (skb2->ip_summed) {
1472 case CHECKSUM_COMPLETE:
1473 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1474 IPPROTO_ICMPV6, skb2->csum))
1475 break;
1476 /*FALLTHROUGH*/
1477 case CHECKSUM_NONE:
1478 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1479 &ip6h->daddr,
1480 skb2->len,
1481 IPPROTO_ICMPV6, 0));
1482 if (__skb_checksum_complete(skb2))
1483 goto out;
1484 }
1485
1486 err = 0;
1487
1488 BR_INPUT_SKB_CB(skb)->igmp = 1;
1489
1490 switch (icmp6_type) {
1491 case ICMPV6_MGM_REPORT:
1492 {
1493 struct mld_msg *mld;
1494 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1495 err = -EINVAL;
1496 goto out;
1497 }
1498 mld = (struct mld_msg *)skb_transport_header(skb2);
1499 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1500 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1501 break;
1502 }
1503 case ICMPV6_MLD2_REPORT:
1504 err = br_ip6_multicast_mld2_report(br, port, skb2);
1505 break;
1506 case ICMPV6_MGM_QUERY:
1507 err = br_ip6_multicast_query(br, port, skb2);
1508 break;
1509 case ICMPV6_MGM_REDUCTION:
1510 {
1511 struct mld_msg *mld;
1512 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1513 err = -EINVAL;
1514 goto out;
1515 }
1516 mld = (struct mld_msg *)skb_transport_header(skb2);
1517 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1518 }
1519 }
1520
1521 out:
1522 kfree_skb(skb2);
1523 return err;
1524 }
1525 #endif
1526
1527 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1528 struct sk_buff *skb)
1529 {
1530 BR_INPUT_SKB_CB(skb)->igmp = 0;
1531 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1532
1533 if (br->multicast_disabled)
1534 return 0;
1535
1536 switch (skb->protocol) {
1537 case htons(ETH_P_IP):
1538 return br_multicast_ipv4_rcv(br, port, skb);
1539 #if IS_ENABLED(CONFIG_IPV6)
1540 case htons(ETH_P_IPV6):
1541 return br_multicast_ipv6_rcv(br, port, skb);
1542 #endif
1543 }
1544
1545 return 0;
1546 }
1547
1548 static void br_multicast_query_expired(unsigned long data)
1549 {
1550 struct net_bridge *br = (void *)data;
1551
1552 spin_lock(&br->multicast_lock);
1553 if (br->multicast_startup_queries_sent <
1554 br->multicast_startup_query_count)
1555 br->multicast_startup_queries_sent++;
1556
1557 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1558
1559 spin_unlock(&br->multicast_lock);
1560 }
1561
1562 void br_multicast_init(struct net_bridge *br)
1563 {
1564 br->hash_elasticity = 4;
1565 br->hash_max = 512;
1566
1567 br->multicast_router = 1;
1568 br->multicast_last_member_count = 2;
1569 br->multicast_startup_query_count = 2;
1570
1571 br->multicast_last_member_interval = HZ;
1572 br->multicast_query_response_interval = 10 * HZ;
1573 br->multicast_startup_query_interval = 125 * HZ / 4;
1574 br->multicast_query_interval = 125 * HZ;
1575 br->multicast_querier_interval = 255 * HZ;
1576 br->multicast_membership_interval = 260 * HZ;
1577
1578 spin_lock_init(&br->multicast_lock);
1579 setup_timer(&br->multicast_router_timer,
1580 br_multicast_local_router_expired, 0);
1581 setup_timer(&br->multicast_querier_timer,
1582 br_multicast_querier_expired, 0);
1583 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1584 (unsigned long)br);
1585 }
1586
1587 void br_multicast_open(struct net_bridge *br)
1588 {
1589 br->multicast_startup_queries_sent = 0;
1590
1591 if (br->multicast_disabled)
1592 return;
1593
1594 mod_timer(&br->multicast_query_timer, jiffies);
1595 }
1596
1597 void br_multicast_stop(struct net_bridge *br)
1598 {
1599 struct net_bridge_mdb_htable *mdb;
1600 struct net_bridge_mdb_entry *mp;
1601 struct hlist_node *p, *n;
1602 u32 ver;
1603 int i;
1604
1605 del_timer_sync(&br->multicast_router_timer);
1606 del_timer_sync(&br->multicast_querier_timer);
1607 del_timer_sync(&br->multicast_query_timer);
1608
1609 spin_lock_bh(&br->multicast_lock);
1610 mdb = mlock_dereference(br->mdb, br);
1611 if (!mdb)
1612 goto out;
1613
1614 br->mdb = NULL;
1615
1616 ver = mdb->ver;
1617 for (i = 0; i < mdb->max; i++) {
1618 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1619 hlist[ver]) {
1620 del_timer(&mp->timer);
1621 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1622 }
1623 }
1624
1625 if (mdb->old) {
1626 spin_unlock_bh(&br->multicast_lock);
1627 rcu_barrier_bh();
1628 spin_lock_bh(&br->multicast_lock);
1629 WARN_ON(mdb->old);
1630 }
1631
1632 mdb->old = mdb;
1633 call_rcu_bh(&mdb->rcu, br_mdb_free);
1634
1635 out:
1636 spin_unlock_bh(&br->multicast_lock);
1637 }
1638
1639 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1640 {
1641 int err = -ENOENT;
1642
1643 spin_lock_bh(&br->multicast_lock);
1644 if (!netif_running(br->dev))
1645 goto unlock;
1646
1647 switch (val) {
1648 case 0:
1649 case 2:
1650 del_timer(&br->multicast_router_timer);
1651 /* fall through */
1652 case 1:
1653 br->multicast_router = val;
1654 err = 0;
1655 break;
1656
1657 default:
1658 err = -EINVAL;
1659 break;
1660 }
1661
1662 unlock:
1663 spin_unlock_bh(&br->multicast_lock);
1664
1665 return err;
1666 }
1667
1668 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1669 {
1670 struct net_bridge *br = p->br;
1671 int err = -ENOENT;
1672
1673 spin_lock(&br->multicast_lock);
1674 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1675 goto unlock;
1676
1677 switch (val) {
1678 case 0:
1679 case 1:
1680 case 2:
1681 p->multicast_router = val;
1682 err = 0;
1683
1684 if (val < 2 && !hlist_unhashed(&p->rlist))
1685 hlist_del_init_rcu(&p->rlist);
1686
1687 if (val == 1)
1688 break;
1689
1690 del_timer(&p->multicast_router_timer);
1691
1692 if (val == 0)
1693 break;
1694
1695 br_multicast_add_router(br, p);
1696 break;
1697
1698 default:
1699 err = -EINVAL;
1700 break;
1701 }
1702
1703 unlock:
1704 spin_unlock(&br->multicast_lock);
1705
1706 return err;
1707 }
1708
1709 static void br_multicast_start_querier(struct net_bridge *br)
1710 {
1711 struct net_bridge_port *port;
1712
1713 br_multicast_open(br);
1714
1715 list_for_each_entry(port, &br->port_list, list) {
1716 if (port->state == BR_STATE_DISABLED ||
1717 port->state == BR_STATE_BLOCKING)
1718 continue;
1719
1720 __br_multicast_enable_port(port);
1721 }
1722 }
1723
1724 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1725 {
1726 int err = 0;
1727 struct net_bridge_mdb_htable *mdb;
1728
1729 spin_lock_bh(&br->multicast_lock);
1730 if (br->multicast_disabled == !val)
1731 goto unlock;
1732
1733 br->multicast_disabled = !val;
1734 if (br->multicast_disabled)
1735 goto unlock;
1736
1737 if (!netif_running(br->dev))
1738 goto unlock;
1739
1740 mdb = mlock_dereference(br->mdb, br);
1741 if (mdb) {
1742 if (mdb->old) {
1743 err = -EEXIST;
1744 rollback:
1745 br->multicast_disabled = !!val;
1746 goto unlock;
1747 }
1748
1749 err = br_mdb_rehash(&br->mdb, mdb->max,
1750 br->hash_elasticity);
1751 if (err)
1752 goto rollback;
1753 }
1754
1755 br_multicast_start_querier(br);
1756
1757 unlock:
1758 spin_unlock_bh(&br->multicast_lock);
1759
1760 return err;
1761 }
1762
1763 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1764 {
1765 int err = -ENOENT;
1766 u32 old;
1767 struct net_bridge_mdb_htable *mdb;
1768
1769 spin_lock(&br->multicast_lock);
1770 if (!netif_running(br->dev))
1771 goto unlock;
1772
1773 err = -EINVAL;
1774 if (!is_power_of_2(val))
1775 goto unlock;
1776
1777 mdb = mlock_dereference(br->mdb, br);
1778 if (mdb && val < mdb->size)
1779 goto unlock;
1780
1781 err = 0;
1782
1783 old = br->hash_max;
1784 br->hash_max = val;
1785
1786 if (mdb) {
1787 if (mdb->old) {
1788 err = -EEXIST;
1789 rollback:
1790 br->hash_max = old;
1791 goto unlock;
1792 }
1793
1794 err = br_mdb_rehash(&br->mdb, br->hash_max,
1795 br->hash_elasticity);
1796 if (err)
1797 goto rollback;
1798 }
1799
1800 unlock:
1801 spin_unlock(&br->multicast_lock);
1802
1803 return err;
1804 }
Linux kernel - Deliverables
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