bridge: Fix IPv6 multicast snooping by correcting offset in MLDv2 report
[linux-2.6.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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40 static inline int ipv6_is_local_multicast(const struct in6_addr *addr)
41 {
42         if (ipv6_addr_is_multicast(addr) &&
43             IPV6_ADDR_MC_SCOPE(addr) <= IPV6_ADDR_SCOPE_LINKLOCAL)
44                 return 1;
45         return 0;
46 }
47 #endif
48
49 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
50 {
51         if (a->proto != b->proto)
52                 return 0;
53         switch (a->proto) {
54         case htons(ETH_P_IP):
55                 return a->u.ip4 == b->u.ip4;
56 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
57         case htons(ETH_P_IPV6):
58                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
59 #endif
60         }
61         return 0;
62 }
63
64 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
65 {
66         return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
67 }
68
69 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
70 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
71                                 const struct in6_addr *ip)
72 {
73         return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
74 }
75 #endif
76
77 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
78                              struct br_ip *ip)
79 {
80         switch (ip->proto) {
81         case htons(ETH_P_IP):
82                 return __br_ip4_hash(mdb, ip->u.ip4);
83 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
84         case htons(ETH_P_IPV6):
85                 return __br_ip6_hash(mdb, &ip->u.ip6);
86 #endif
87         }
88         return 0;
89 }
90
91 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
92         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
93 {
94         struct net_bridge_mdb_entry *mp;
95         struct hlist_node *p;
96
97         hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
98                 if (br_ip_equal(&mp->addr, dst))
99                         return mp;
100         }
101
102         return NULL;
103 }
104
105 static struct net_bridge_mdb_entry *br_mdb_ip_get(
106         struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
107 {
108         if (!mdb)
109                 return NULL;
110
111         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
112 }
113
114 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
115         struct net_bridge_mdb_htable *mdb, __be32 dst)
116 {
117         struct br_ip br_dst;
118
119         br_dst.u.ip4 = dst;
120         br_dst.proto = htons(ETH_P_IP);
121
122         return br_mdb_ip_get(mdb, &br_dst);
123 }
124
125 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
126 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
127         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
128 {
129         struct br_ip br_dst;
130
131         ipv6_addr_copy(&br_dst.u.ip6, dst);
132         br_dst.proto = htons(ETH_P_IPV6);
133
134         return br_mdb_ip_get(mdb, &br_dst);
135 }
136 #endif
137
138 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
139                                         struct sk_buff *skb)
140 {
141         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
142         struct br_ip ip;
143
144         if (br->multicast_disabled)
145                 return NULL;
146
147         if (BR_INPUT_SKB_CB(skb)->igmp)
148                 return NULL;
149
150         ip.proto = skb->protocol;
151
152         switch (skb->protocol) {
153         case htons(ETH_P_IP):
154                 ip.u.ip4 = ip_hdr(skb)->daddr;
155                 break;
156 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
157         case htons(ETH_P_IPV6):
158                 ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr);
159                 break;
160 #endif
161         default:
162                 return NULL;
163         }
164
165         return br_mdb_ip_get(mdb, &ip);
166 }
167
168 static void br_mdb_free(struct rcu_head *head)
169 {
170         struct net_bridge_mdb_htable *mdb =
171                 container_of(head, struct net_bridge_mdb_htable, rcu);
172         struct net_bridge_mdb_htable *old = mdb->old;
173
174         mdb->old = NULL;
175         kfree(old->mhash);
176         kfree(old);
177 }
178
179 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
180                        struct net_bridge_mdb_htable *old,
181                        int elasticity)
182 {
183         struct net_bridge_mdb_entry *mp;
184         struct hlist_node *p;
185         int maxlen;
186         int len;
187         int i;
188
189         for (i = 0; i < old->max; i++)
190                 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
191                         hlist_add_head(&mp->hlist[new->ver],
192                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
193
194         if (!elasticity)
195                 return 0;
196
197         maxlen = 0;
198         for (i = 0; i < new->max; i++) {
199                 len = 0;
200                 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
201                         len++;
202                 if (len > maxlen)
203                         maxlen = len;
204         }
205
206         return maxlen > elasticity ? -EINVAL : 0;
207 }
208
209 static void br_multicast_free_pg(struct rcu_head *head)
210 {
211         struct net_bridge_port_group *p =
212                 container_of(head, struct net_bridge_port_group, rcu);
213
214         kfree(p);
215 }
216
217 static void br_multicast_free_group(struct rcu_head *head)
218 {
219         struct net_bridge_mdb_entry *mp =
220                 container_of(head, struct net_bridge_mdb_entry, rcu);
221
222         kfree(mp);
223 }
224
225 static void br_multicast_group_expired(unsigned long data)
226 {
227         struct net_bridge_mdb_entry *mp = (void *)data;
228         struct net_bridge *br = mp->br;
229         struct net_bridge_mdb_htable *mdb;
230
231         spin_lock(&br->multicast_lock);
232         if (!netif_running(br->dev) || timer_pending(&mp->timer))
233                 goto out;
234
235         mp->mglist = false;
236
237         if (mp->ports)
238                 goto out;
239
240         mdb = mlock_dereference(br->mdb, br);
241
242         hlist_del_rcu(&mp->hlist[mdb->ver]);
243         mdb->size--;
244
245         del_timer(&mp->query_timer);
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                 del_timer(&p->query_timer);
276                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
277
278                 if (!mp->ports && !mp->mglist &&
279                     netif_running(br->dev))
280                         mod_timer(&mp->timer, jiffies);
281
282                 return;
283         }
284
285         WARN_ON(1);
286 }
287
288 static void br_multicast_port_group_expired(unsigned long data)
289 {
290         struct net_bridge_port_group *pg = (void *)data;
291         struct net_bridge *br = pg->port->br;
292
293         spin_lock(&br->multicast_lock);
294         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
295             hlist_unhashed(&pg->mglist))
296                 goto out;
297
298         br_multicast_del_pg(br, pg);
299
300 out:
301         spin_unlock(&br->multicast_lock);
302 }
303
304 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
305                          int elasticity)
306 {
307         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
308         struct net_bridge_mdb_htable *mdb;
309         int err;
310
311         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
312         if (!mdb)
313                 return -ENOMEM;
314
315         mdb->max = max;
316         mdb->old = old;
317
318         mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
319         if (!mdb->mhash) {
320                 kfree(mdb);
321                 return -ENOMEM;
322         }
323
324         mdb->size = old ? old->size : 0;
325         mdb->ver = old ? old->ver ^ 1 : 0;
326
327         if (!old || elasticity)
328                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
329         else
330                 mdb->secret = old->secret;
331
332         if (!old)
333                 goto out;
334
335         err = br_mdb_copy(mdb, old, elasticity);
336         if (err) {
337                 kfree(mdb->mhash);
338                 kfree(mdb);
339                 return err;
340         }
341
342         call_rcu_bh(&mdb->rcu, br_mdb_free);
343
344 out:
345         rcu_assign_pointer(*mdbp, mdb);
346
347         return 0;
348 }
349
350 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
351                                                     __be32 group)
352 {
353         struct sk_buff *skb;
354         struct igmphdr *ih;
355         struct ethhdr *eth;
356         struct iphdr *iph;
357
358         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
359                                                  sizeof(*ih) + 4);
360         if (!skb)
361                 goto out;
362
363         skb->protocol = htons(ETH_P_IP);
364
365         skb_reset_mac_header(skb);
366         eth = eth_hdr(skb);
367
368         memcpy(eth->h_source, br->dev->dev_addr, 6);
369         eth->h_dest[0] = 1;
370         eth->h_dest[1] = 0;
371         eth->h_dest[2] = 0x5e;
372         eth->h_dest[3] = 0;
373         eth->h_dest[4] = 0;
374         eth->h_dest[5] = 1;
375         eth->h_proto = htons(ETH_P_IP);
376         skb_put(skb, sizeof(*eth));
377
378         skb_set_network_header(skb, skb->len);
379         iph = ip_hdr(skb);
380
381         iph->version = 4;
382         iph->ihl = 6;
383         iph->tos = 0xc0;
384         iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
385         iph->id = 0;
386         iph->frag_off = htons(IP_DF);
387         iph->ttl = 1;
388         iph->protocol = IPPROTO_IGMP;
389         iph->saddr = 0;
390         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
391         ((u8 *)&iph[1])[0] = IPOPT_RA;
392         ((u8 *)&iph[1])[1] = 4;
393         ((u8 *)&iph[1])[2] = 0;
394         ((u8 *)&iph[1])[3] = 0;
395         ip_send_check(iph);
396         skb_put(skb, 24);
397
398         skb_set_transport_header(skb, skb->len);
399         ih = igmp_hdr(skb);
400         ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
401         ih->code = (group ? br->multicast_last_member_interval :
402                             br->multicast_query_response_interval) /
403                    (HZ / IGMP_TIMER_SCALE);
404         ih->group = group;
405         ih->csum = 0;
406         ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
407         skb_put(skb, sizeof(*ih));
408
409         __skb_pull(skb, sizeof(*eth));
410
411 out:
412         return skb;
413 }
414
415 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
416 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
417                                                     struct in6_addr *group)
418 {
419         struct sk_buff *skb;
420         struct ipv6hdr *ip6h;
421         struct mld_msg *mldq;
422         struct ethhdr *eth;
423         u8 *hopopt;
424         unsigned long interval;
425
426         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
427                                                  8 + sizeof(*mldq));
428         if (!skb)
429                 goto out;
430
431         skb->protocol = htons(ETH_P_IPV6);
432
433         /* Ethernet header */
434         skb_reset_mac_header(skb);
435         eth = eth_hdr(skb);
436
437         memcpy(eth->h_source, br->dev->dev_addr, 6);
438         ipv6_eth_mc_map(group, eth->h_dest);
439         eth->h_proto = htons(ETH_P_IPV6);
440         skb_put(skb, sizeof(*eth));
441
442         /* IPv6 header + HbH option */
443         skb_set_network_header(skb, skb->len);
444         ip6h = ipv6_hdr(skb);
445
446         *(__force __be32 *)ip6h = htonl(0x60000000);
447         ip6h->payload_len = htons(8 + sizeof(*mldq));
448         ip6h->nexthdr = IPPROTO_HOPOPTS;
449         ip6h->hop_limit = 1;
450         ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0);
451         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
452
453         hopopt = (u8 *)(ip6h + 1);
454         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
455         hopopt[1] = 0;                          /* length of HbH */
456         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
457         hopopt[3] = 2;                          /* Length of RA Option */
458         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
459         hopopt[5] = 0;
460         hopopt[6] = IPV6_TLV_PAD0;              /* Pad0 */
461         hopopt[7] = IPV6_TLV_PAD0;              /* Pad0 */
462
463         skb_put(skb, sizeof(*ip6h) + 8);
464
465         /* ICMPv6 */
466         skb_set_transport_header(skb, skb->len);
467         mldq = (struct mld_msg *) icmp6_hdr(skb);
468
469         interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
470                                           br->multicast_query_response_interval;
471
472         mldq->mld_type = ICMPV6_MGM_QUERY;
473         mldq->mld_code = 0;
474         mldq->mld_cksum = 0;
475         mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
476         mldq->mld_reserved = 0;
477         ipv6_addr_copy(&mldq->mld_mca, group);
478
479         /* checksum */
480         mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
481                                           sizeof(*mldq), IPPROTO_ICMPV6,
482                                           csum_partial(mldq,
483                                                        sizeof(*mldq), 0));
484         skb_put(skb, sizeof(*mldq));
485
486         __skb_pull(skb, sizeof(*eth));
487
488 out:
489         return skb;
490 }
491 #endif
492
493 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
494                                                 struct br_ip *addr)
495 {
496         switch (addr->proto) {
497         case htons(ETH_P_IP):
498                 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
499 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
500         case htons(ETH_P_IPV6):
501                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
502 #endif
503         }
504         return NULL;
505 }
506
507 static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
508 {
509         struct net_bridge *br = mp->br;
510         struct sk_buff *skb;
511
512         skb = br_multicast_alloc_query(br, &mp->addr);
513         if (!skb)
514                 goto timer;
515
516         netif_rx(skb);
517
518 timer:
519         if (++mp->queries_sent < br->multicast_last_member_count)
520                 mod_timer(&mp->query_timer,
521                           jiffies + br->multicast_last_member_interval);
522 }
523
524 static void br_multicast_group_query_expired(unsigned long data)
525 {
526         struct net_bridge_mdb_entry *mp = (void *)data;
527         struct net_bridge *br = mp->br;
528
529         spin_lock(&br->multicast_lock);
530         if (!netif_running(br->dev) || !mp->mglist ||
531             mp->queries_sent >= br->multicast_last_member_count)
532                 goto out;
533
534         br_multicast_send_group_query(mp);
535
536 out:
537         spin_unlock(&br->multicast_lock);
538 }
539
540 static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
541 {
542         struct net_bridge_port *port = pg->port;
543         struct net_bridge *br = port->br;
544         struct sk_buff *skb;
545
546         skb = br_multicast_alloc_query(br, &pg->addr);
547         if (!skb)
548                 goto timer;
549
550         br_deliver(port, skb);
551
552 timer:
553         if (++pg->queries_sent < br->multicast_last_member_count)
554                 mod_timer(&pg->query_timer,
555                           jiffies + br->multicast_last_member_interval);
556 }
557
558 static void br_multicast_port_group_query_expired(unsigned long data)
559 {
560         struct net_bridge_port_group *pg = (void *)data;
561         struct net_bridge_port *port = pg->port;
562         struct net_bridge *br = port->br;
563
564         spin_lock(&br->multicast_lock);
565         if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
566             pg->queries_sent >= br->multicast_last_member_count)
567                 goto out;
568
569         br_multicast_send_port_group_query(pg);
570
571 out:
572         spin_unlock(&br->multicast_lock);
573 }
574
575 static struct net_bridge_mdb_entry *br_multicast_get_group(
576         struct net_bridge *br, struct net_bridge_port *port,
577         struct br_ip *group, int hash)
578 {
579         struct net_bridge_mdb_htable *mdb;
580         struct net_bridge_mdb_entry *mp;
581         struct hlist_node *p;
582         unsigned count = 0;
583         unsigned max;
584         int elasticity;
585         int err;
586
587         mdb = rcu_dereference_protected(br->mdb, 1);
588         hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
589                 count++;
590                 if (unlikely(br_ip_equal(group, &mp->addr)))
591                         return mp;
592         }
593
594         elasticity = 0;
595         max = mdb->max;
596
597         if (unlikely(count > br->hash_elasticity && count)) {
598                 if (net_ratelimit())
599                         br_info(br, "Multicast hash table "
600                                 "chain limit reached: %s\n",
601                                 port ? port->dev->name : br->dev->name);
602
603                 elasticity = br->hash_elasticity;
604         }
605
606         if (mdb->size >= max) {
607                 max *= 2;
608                 if (unlikely(max >= br->hash_max)) {
609                         br_warn(br, "Multicast hash table maximum "
610                                 "reached, disabling snooping: %s, %d\n",
611                                 port ? port->dev->name : br->dev->name, max);
612                         err = -E2BIG;
613 disable:
614                         br->multicast_disabled = 1;
615                         goto err;
616                 }
617         }
618
619         if (max > mdb->max || elasticity) {
620                 if (mdb->old) {
621                         if (net_ratelimit())
622                                 br_info(br, "Multicast hash table "
623                                         "on fire: %s\n",
624                                         port ? port->dev->name : br->dev->name);
625                         err = -EEXIST;
626                         goto err;
627                 }
628
629                 err = br_mdb_rehash(&br->mdb, max, elasticity);
630                 if (err) {
631                         br_warn(br, "Cannot rehash multicast "
632                                 "hash table, disabling snooping: %s, %d, %d\n",
633                                 port ? port->dev->name : br->dev->name,
634                                 mdb->size, err);
635                         goto disable;
636                 }
637
638                 err = -EAGAIN;
639                 goto err;
640         }
641
642         return NULL;
643
644 err:
645         mp = ERR_PTR(err);
646         return mp;
647 }
648
649 static struct net_bridge_mdb_entry *br_multicast_new_group(
650         struct net_bridge *br, struct net_bridge_port *port,
651         struct br_ip *group)
652 {
653         struct net_bridge_mdb_htable *mdb;
654         struct net_bridge_mdb_entry *mp;
655         int hash;
656         int err;
657
658         mdb = rcu_dereference_protected(br->mdb, 1);
659         if (!mdb) {
660                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
661                 if (err)
662                         return ERR_PTR(err);
663                 goto rehash;
664         }
665
666         hash = br_ip_hash(mdb, group);
667         mp = br_multicast_get_group(br, port, group, hash);
668         switch (PTR_ERR(mp)) {
669         case 0:
670                 break;
671
672         case -EAGAIN:
673 rehash:
674                 mdb = rcu_dereference_protected(br->mdb, 1);
675                 hash = br_ip_hash(mdb, group);
676                 break;
677
678         default:
679                 goto out;
680         }
681
682         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
683         if (unlikely(!mp))
684                 return ERR_PTR(-ENOMEM);
685
686         mp->br = br;
687         mp->addr = *group;
688         setup_timer(&mp->timer, br_multicast_group_expired,
689                     (unsigned long)mp);
690         setup_timer(&mp->query_timer, br_multicast_group_query_expired,
691                     (unsigned long)mp);
692
693         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
694         mdb->size++;
695
696 out:
697         return mp;
698 }
699
700 static int br_multicast_add_group(struct net_bridge *br,
701                                   struct net_bridge_port *port,
702                                   struct br_ip *group)
703 {
704         struct net_bridge_mdb_entry *mp;
705         struct net_bridge_port_group *p;
706         struct net_bridge_port_group __rcu **pp;
707         unsigned long now = jiffies;
708         int err;
709
710         spin_lock(&br->multicast_lock);
711         if (!netif_running(br->dev) ||
712             (port && port->state == BR_STATE_DISABLED))
713                 goto out;
714
715         mp = br_multicast_new_group(br, port, group);
716         err = PTR_ERR(mp);
717         if (IS_ERR(mp))
718                 goto err;
719
720         if (!port) {
721                 mp->mglist = true;
722                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
723                 goto out;
724         }
725
726         for (pp = &mp->ports;
727              (p = mlock_dereference(*pp, br)) != NULL;
728              pp = &p->next) {
729                 if (p->port == port)
730                         goto found;
731                 if ((unsigned long)p->port < (unsigned long)port)
732                         break;
733         }
734
735         p = kzalloc(sizeof(*p), GFP_ATOMIC);
736         err = -ENOMEM;
737         if (unlikely(!p))
738                 goto err;
739
740         p->addr = *group;
741         p->port = port;
742         p->next = *pp;
743         hlist_add_head(&p->mglist, &port->mglist);
744         setup_timer(&p->timer, br_multicast_port_group_expired,
745                     (unsigned long)p);
746         setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
747                     (unsigned long)p);
748
749         rcu_assign_pointer(*pp, p);
750
751 found:
752         mod_timer(&p->timer, now + br->multicast_membership_interval);
753 out:
754         err = 0;
755
756 err:
757         spin_unlock(&br->multicast_lock);
758         return err;
759 }
760
761 static int br_ip4_multicast_add_group(struct net_bridge *br,
762                                       struct net_bridge_port *port,
763                                       __be32 group)
764 {
765         struct br_ip br_group;
766
767         if (ipv4_is_local_multicast(group))
768                 return 0;
769
770         br_group.u.ip4 = group;
771         br_group.proto = htons(ETH_P_IP);
772
773         return br_multicast_add_group(br, port, &br_group);
774 }
775
776 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
777 static int br_ip6_multicast_add_group(struct net_bridge *br,
778                                       struct net_bridge_port *port,
779                                       const struct in6_addr *group)
780 {
781         struct br_ip br_group;
782
783         if (ipv6_is_local_multicast(group))
784                 return 0;
785
786         ipv6_addr_copy(&br_group.u.ip6, group);
787         br_group.proto = htons(ETH_P_IPV6);
788
789         return br_multicast_add_group(br, port, &br_group);
790 }
791 #endif
792
793 static void br_multicast_router_expired(unsigned long data)
794 {
795         struct net_bridge_port *port = (void *)data;
796         struct net_bridge *br = port->br;
797
798         spin_lock(&br->multicast_lock);
799         if (port->multicast_router != 1 ||
800             timer_pending(&port->multicast_router_timer) ||
801             hlist_unhashed(&port->rlist))
802                 goto out;
803
804         hlist_del_init_rcu(&port->rlist);
805
806 out:
807         spin_unlock(&br->multicast_lock);
808 }
809
810 static void br_multicast_local_router_expired(unsigned long data)
811 {
812 }
813
814 static void __br_multicast_send_query(struct net_bridge *br,
815                                       struct net_bridge_port *port,
816                                       struct br_ip *ip)
817 {
818         struct sk_buff *skb;
819
820         skb = br_multicast_alloc_query(br, ip);
821         if (!skb)
822                 return;
823
824         if (port) {
825                 __skb_push(skb, sizeof(struct ethhdr));
826                 skb->dev = port->dev;
827                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
828                         dev_queue_xmit);
829         } else
830                 netif_rx(skb);
831 }
832
833 static void br_multicast_send_query(struct net_bridge *br,
834                                     struct net_bridge_port *port, u32 sent)
835 {
836         unsigned long time;
837         struct br_ip br_group;
838
839         if (!netif_running(br->dev) || br->multicast_disabled ||
840             timer_pending(&br->multicast_querier_timer))
841                 return;
842
843         memset(&br_group.u, 0, sizeof(br_group.u));
844
845         br_group.proto = htons(ETH_P_IP);
846         __br_multicast_send_query(br, port, &br_group);
847
848 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
849         br_group.proto = htons(ETH_P_IPV6);
850         __br_multicast_send_query(br, port, &br_group);
851 #endif
852
853         time = jiffies;
854         time += sent < br->multicast_startup_query_count ?
855                 br->multicast_startup_query_interval :
856                 br->multicast_query_interval;
857         mod_timer(port ? &port->multicast_query_timer :
858                          &br->multicast_query_timer, time);
859 }
860
861 static void br_multicast_port_query_expired(unsigned long data)
862 {
863         struct net_bridge_port *port = (void *)data;
864         struct net_bridge *br = port->br;
865
866         spin_lock(&br->multicast_lock);
867         if (port->state == BR_STATE_DISABLED ||
868             port->state == BR_STATE_BLOCKING)
869                 goto out;
870
871         if (port->multicast_startup_queries_sent <
872             br->multicast_startup_query_count)
873                 port->multicast_startup_queries_sent++;
874
875         br_multicast_send_query(port->br, port,
876                                 port->multicast_startup_queries_sent);
877
878 out:
879         spin_unlock(&br->multicast_lock);
880 }
881
882 void br_multicast_add_port(struct net_bridge_port *port)
883 {
884         port->multicast_router = 1;
885
886         setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
887                     (unsigned long)port);
888         setup_timer(&port->multicast_query_timer,
889                     br_multicast_port_query_expired, (unsigned long)port);
890 }
891
892 void br_multicast_del_port(struct net_bridge_port *port)
893 {
894         del_timer_sync(&port->multicast_router_timer);
895 }
896
897 static void __br_multicast_enable_port(struct net_bridge_port *port)
898 {
899         port->multicast_startup_queries_sent = 0;
900
901         if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
902             del_timer(&port->multicast_query_timer))
903                 mod_timer(&port->multicast_query_timer, jiffies);
904 }
905
906 void br_multicast_enable_port(struct net_bridge_port *port)
907 {
908         struct net_bridge *br = port->br;
909
910         spin_lock(&br->multicast_lock);
911         if (br->multicast_disabled || !netif_running(br->dev))
912                 goto out;
913
914         __br_multicast_enable_port(port);
915
916 out:
917         spin_unlock(&br->multicast_lock);
918 }
919
920 void br_multicast_disable_port(struct net_bridge_port *port)
921 {
922         struct net_bridge *br = port->br;
923         struct net_bridge_port_group *pg;
924         struct hlist_node *p, *n;
925
926         spin_lock(&br->multicast_lock);
927         hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
928                 br_multicast_del_pg(br, pg);
929
930         if (!hlist_unhashed(&port->rlist))
931                 hlist_del_init_rcu(&port->rlist);
932         del_timer(&port->multicast_router_timer);
933         del_timer(&port->multicast_query_timer);
934         spin_unlock(&br->multicast_lock);
935 }
936
937 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
938                                          struct net_bridge_port *port,
939                                          struct sk_buff *skb)
940 {
941         struct igmpv3_report *ih;
942         struct igmpv3_grec *grec;
943         int i;
944         int len;
945         int num;
946         int type;
947         int err = 0;
948         __be32 group;
949
950         if (!pskb_may_pull(skb, sizeof(*ih)))
951                 return -EINVAL;
952
953         ih = igmpv3_report_hdr(skb);
954         num = ntohs(ih->ngrec);
955         len = sizeof(*ih);
956
957         for (i = 0; i < num; i++) {
958                 len += sizeof(*grec);
959                 if (!pskb_may_pull(skb, len))
960                         return -EINVAL;
961
962                 grec = (void *)(skb->data + len - sizeof(*grec));
963                 group = grec->grec_mca;
964                 type = grec->grec_type;
965
966                 len += ntohs(grec->grec_nsrcs) * 4;
967                 if (!pskb_may_pull(skb, len))
968                         return -EINVAL;
969
970                 /* We treat this as an IGMPv2 report for now. */
971                 switch (type) {
972                 case IGMPV3_MODE_IS_INCLUDE:
973                 case IGMPV3_MODE_IS_EXCLUDE:
974                 case IGMPV3_CHANGE_TO_INCLUDE:
975                 case IGMPV3_CHANGE_TO_EXCLUDE:
976                 case IGMPV3_ALLOW_NEW_SOURCES:
977                 case IGMPV3_BLOCK_OLD_SOURCES:
978                         break;
979
980                 default:
981                         continue;
982                 }
983
984                 err = br_ip4_multicast_add_group(br, port, group);
985                 if (err)
986                         break;
987         }
988
989         return err;
990 }
991
992 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
993 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
994                                         struct net_bridge_port *port,
995                                         struct sk_buff *skb)
996 {
997         struct icmp6hdr *icmp6h;
998         struct mld2_grec *grec;
999         int i;
1000         int len;
1001         int num;
1002         int err = 0;
1003
1004         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1005                 return -EINVAL;
1006
1007         icmp6h = icmp6_hdr(skb);
1008         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1009         len = sizeof(*icmp6h);
1010
1011         for (i = 0; i < num; i++) {
1012                 __be16 *nsrcs, _nsrcs;
1013
1014                 nsrcs = skb_header_pointer(skb,
1015                                            len + offsetof(struct mld2_grec,
1016                                                           grec_nsrcs),
1017                                            sizeof(_nsrcs), &_nsrcs);
1018                 if (!nsrcs)
1019                         return -EINVAL;
1020
1021                 if (!pskb_may_pull(skb,
1022                                    len + sizeof(*grec) +
1023                                    sizeof(struct in6_addr) * (*nsrcs)))
1024                         return -EINVAL;
1025
1026                 grec = (struct mld2_grec *)(skb->data + len);
1027                 len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs);
1028
1029                 /* We treat these as MLDv1 reports for now. */
1030                 switch (grec->grec_type) {
1031                 case MLD2_MODE_IS_INCLUDE:
1032                 case MLD2_MODE_IS_EXCLUDE:
1033                 case MLD2_CHANGE_TO_INCLUDE:
1034                 case MLD2_CHANGE_TO_EXCLUDE:
1035                 case MLD2_ALLOW_NEW_SOURCES:
1036                 case MLD2_BLOCK_OLD_SOURCES:
1037                         break;
1038
1039                 default:
1040                         continue;
1041                 }
1042
1043                 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
1044                 if (!err)
1045                         break;
1046         }
1047
1048         return err;
1049 }
1050 #endif
1051
1052 /*
1053  * Add port to rotuer_list
1054  *  list is maintained ordered by pointer value
1055  *  and locked by br->multicast_lock and RCU
1056  */
1057 static void br_multicast_add_router(struct net_bridge *br,
1058                                     struct net_bridge_port *port)
1059 {
1060         struct net_bridge_port *p;
1061         struct hlist_node *n, *slot = NULL;
1062
1063         hlist_for_each_entry(p, n, &br->router_list, rlist) {
1064                 if ((unsigned long) port >= (unsigned long) p)
1065                         break;
1066                 slot = n;
1067         }
1068
1069         if (slot)
1070                 hlist_add_after_rcu(slot, &port->rlist);
1071         else
1072                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1073 }
1074
1075 static void br_multicast_mark_router(struct net_bridge *br,
1076                                      struct net_bridge_port *port)
1077 {
1078         unsigned long now = jiffies;
1079
1080         if (!port) {
1081                 if (br->multicast_router == 1)
1082                         mod_timer(&br->multicast_router_timer,
1083                                   now + br->multicast_querier_interval);
1084                 return;
1085         }
1086
1087         if (port->multicast_router != 1)
1088                 return;
1089
1090         if (!hlist_unhashed(&port->rlist))
1091                 goto timer;
1092
1093         br_multicast_add_router(br, port);
1094
1095 timer:
1096         mod_timer(&port->multicast_router_timer,
1097                   now + br->multicast_querier_interval);
1098 }
1099
1100 static void br_multicast_query_received(struct net_bridge *br,
1101                                         struct net_bridge_port *port,
1102                                         int saddr)
1103 {
1104         if (saddr)
1105                 mod_timer(&br->multicast_querier_timer,
1106                           jiffies + br->multicast_querier_interval);
1107         else if (timer_pending(&br->multicast_querier_timer))
1108                 return;
1109
1110         br_multicast_mark_router(br, port);
1111 }
1112
1113 static int br_ip4_multicast_query(struct net_bridge *br,
1114                                   struct net_bridge_port *port,
1115                                   struct sk_buff *skb)
1116 {
1117         struct iphdr *iph = ip_hdr(skb);
1118         struct igmphdr *ih = igmp_hdr(skb);
1119         struct net_bridge_mdb_entry *mp;
1120         struct igmpv3_query *ih3;
1121         struct net_bridge_port_group *p;
1122         struct net_bridge_port_group __rcu **pp;
1123         unsigned long max_delay;
1124         unsigned long now = jiffies;
1125         __be32 group;
1126         int err = 0;
1127
1128         spin_lock(&br->multicast_lock);
1129         if (!netif_running(br->dev) ||
1130             (port && port->state == BR_STATE_DISABLED))
1131                 goto out;
1132
1133         br_multicast_query_received(br, port, !!iph->saddr);
1134
1135         group = ih->group;
1136
1137         if (skb->len == sizeof(*ih)) {
1138                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1139
1140                 if (!max_delay) {
1141                         max_delay = 10 * HZ;
1142                         group = 0;
1143                 }
1144         } else {
1145                 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1146                         err = -EINVAL;
1147                         goto out;
1148                 }
1149
1150                 ih3 = igmpv3_query_hdr(skb);
1151                 if (ih3->nsrcs)
1152                         goto out;
1153
1154                 max_delay = ih3->code ?
1155                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1156         }
1157
1158         if (!group)
1159                 goto out;
1160
1161         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
1162         if (!mp)
1163                 goto out;
1164
1165         max_delay *= br->multicast_last_member_count;
1166
1167         if (mp->mglist &&
1168             (timer_pending(&mp->timer) ?
1169              time_after(mp->timer.expires, now + max_delay) :
1170              try_to_del_timer_sync(&mp->timer) >= 0))
1171                 mod_timer(&mp->timer, now + max_delay);
1172
1173         for (pp = &mp->ports;
1174              (p = mlock_dereference(*pp, br)) != NULL;
1175              pp = &p->next) {
1176                 if (timer_pending(&p->timer) ?
1177                     time_after(p->timer.expires, now + max_delay) :
1178                     try_to_del_timer_sync(&p->timer) >= 0)
1179                         mod_timer(&p->timer, now + max_delay);
1180         }
1181
1182 out:
1183         spin_unlock(&br->multicast_lock);
1184         return err;
1185 }
1186
1187 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1188 static int br_ip6_multicast_query(struct net_bridge *br,
1189                                   struct net_bridge_port *port,
1190                                   struct sk_buff *skb)
1191 {
1192         struct ipv6hdr *ip6h = ipv6_hdr(skb);
1193         struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1194         struct net_bridge_mdb_entry *mp;
1195         struct mld2_query *mld2q;
1196         struct net_bridge_port_group *p;
1197         struct net_bridge_port_group __rcu **pp;
1198         unsigned long max_delay;
1199         unsigned long now = jiffies;
1200         struct in6_addr *group = NULL;
1201         int err = 0;
1202
1203         spin_lock(&br->multicast_lock);
1204         if (!netif_running(br->dev) ||
1205             (port && port->state == BR_STATE_DISABLED))
1206                 goto out;
1207
1208         br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1209
1210         if (skb->len == sizeof(*mld)) {
1211                 if (!pskb_may_pull(skb, sizeof(*mld))) {
1212                         err = -EINVAL;
1213                         goto out;
1214                 }
1215                 mld = (struct mld_msg *) icmp6_hdr(skb);
1216                 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
1217                 if (max_delay)
1218                         group = &mld->mld_mca;
1219         } else if (skb->len >= sizeof(*mld2q)) {
1220                 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1221                         err = -EINVAL;
1222                         goto out;
1223                 }
1224                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1225                 if (!mld2q->mld2q_nsrcs)
1226                         group = &mld2q->mld2q_mca;
1227                 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1228         }
1229
1230         if (!group)
1231                 goto out;
1232
1233         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
1234         if (!mp)
1235                 goto out;
1236
1237         max_delay *= br->multicast_last_member_count;
1238         if (mp->mglist &&
1239             (timer_pending(&mp->timer) ?
1240              time_after(mp->timer.expires, now + max_delay) :
1241              try_to_del_timer_sync(&mp->timer) >= 0))
1242                 mod_timer(&mp->timer, now + max_delay);
1243
1244         for (pp = &mp->ports;
1245              (p = mlock_dereference(*pp, br)) != NULL;
1246              pp = &p->next) {
1247                 if (timer_pending(&p->timer) ?
1248                     time_after(p->timer.expires, now + max_delay) :
1249                     try_to_del_timer_sync(&p->timer) >= 0)
1250                         mod_timer(&p->timer, now + max_delay);
1251         }
1252
1253 out:
1254         spin_unlock(&br->multicast_lock);
1255         return err;
1256 }
1257 #endif
1258
1259 static void br_multicast_leave_group(struct net_bridge *br,
1260                                      struct net_bridge_port *port,
1261                                      struct br_ip *group)
1262 {
1263         struct net_bridge_mdb_htable *mdb;
1264         struct net_bridge_mdb_entry *mp;
1265         struct net_bridge_port_group *p;
1266         unsigned long now;
1267         unsigned long time;
1268
1269         spin_lock(&br->multicast_lock);
1270         if (!netif_running(br->dev) ||
1271             (port && port->state == BR_STATE_DISABLED) ||
1272             timer_pending(&br->multicast_querier_timer))
1273                 goto out;
1274
1275         mdb = mlock_dereference(br->mdb, br);
1276         mp = br_mdb_ip_get(mdb, group);
1277         if (!mp)
1278                 goto out;
1279
1280         now = jiffies;
1281         time = now + br->multicast_last_member_count *
1282                      br->multicast_last_member_interval;
1283
1284         if (!port) {
1285                 if (mp->mglist &&
1286                     (timer_pending(&mp->timer) ?
1287                      time_after(mp->timer.expires, time) :
1288                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1289                         mod_timer(&mp->timer, time);
1290
1291                         mp->queries_sent = 0;
1292                         mod_timer(&mp->query_timer, now);
1293                 }
1294
1295                 goto out;
1296         }
1297
1298         for (p = mlock_dereference(mp->ports, br);
1299              p != NULL;
1300              p = mlock_dereference(p->next, br)) {
1301                 if (p->port != port)
1302                         continue;
1303
1304                 if (!hlist_unhashed(&p->mglist) &&
1305                     (timer_pending(&p->timer) ?
1306                      time_after(p->timer.expires, time) :
1307                      try_to_del_timer_sync(&p->timer) >= 0)) {
1308                         mod_timer(&p->timer, time);
1309
1310                         p->queries_sent = 0;
1311                         mod_timer(&p->query_timer, now);
1312                 }
1313
1314                 break;
1315         }
1316
1317 out:
1318         spin_unlock(&br->multicast_lock);
1319 }
1320
1321 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1322                                          struct net_bridge_port *port,
1323                                          __be32 group)
1324 {
1325         struct br_ip br_group;
1326
1327         if (ipv4_is_local_multicast(group))
1328                 return;
1329
1330         br_group.u.ip4 = group;
1331         br_group.proto = htons(ETH_P_IP);
1332
1333         br_multicast_leave_group(br, port, &br_group);
1334 }
1335
1336 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1337 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1338                                          struct net_bridge_port *port,
1339                                          const struct in6_addr *group)
1340 {
1341         struct br_ip br_group;
1342
1343         if (ipv6_is_local_multicast(group))
1344                 return;
1345
1346         ipv6_addr_copy(&br_group.u.ip6, group);
1347         br_group.proto = htons(ETH_P_IPV6);
1348
1349         br_multicast_leave_group(br, port, &br_group);
1350 }
1351 #endif
1352
1353 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1354                                  struct net_bridge_port *port,
1355                                  struct sk_buff *skb)
1356 {
1357         struct sk_buff *skb2 = skb;
1358         struct iphdr *iph;
1359         struct igmphdr *ih;
1360         unsigned len;
1361         unsigned offset;
1362         int err;
1363
1364         /* We treat OOM as packet loss for now. */
1365         if (!pskb_may_pull(skb, sizeof(*iph)))
1366                 return -EINVAL;
1367
1368         iph = ip_hdr(skb);
1369
1370         if (iph->ihl < 5 || iph->version != 4)
1371                 return -EINVAL;
1372
1373         if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1374                 return -EINVAL;
1375
1376         iph = ip_hdr(skb);
1377
1378         if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1379                 return -EINVAL;
1380
1381         if (iph->protocol != IPPROTO_IGMP)
1382                 return 0;
1383
1384         len = ntohs(iph->tot_len);
1385         if (skb->len < len || len < ip_hdrlen(skb))
1386                 return -EINVAL;
1387
1388         if (skb->len > len) {
1389                 skb2 = skb_clone(skb, GFP_ATOMIC);
1390                 if (!skb2)
1391                         return -ENOMEM;
1392
1393                 err = pskb_trim_rcsum(skb2, len);
1394                 if (err)
1395                         goto err_out;
1396         }
1397
1398         len -= ip_hdrlen(skb2);
1399         offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1400         __skb_pull(skb2, offset);
1401         skb_reset_transport_header(skb2);
1402
1403         err = -EINVAL;
1404         if (!pskb_may_pull(skb2, sizeof(*ih)))
1405                 goto out;
1406
1407         switch (skb2->ip_summed) {
1408         case CHECKSUM_COMPLETE:
1409                 if (!csum_fold(skb2->csum))
1410                         break;
1411                 /* fall through */
1412         case CHECKSUM_NONE:
1413                 skb2->csum = 0;
1414                 if (skb_checksum_complete(skb2))
1415                         goto out;
1416         }
1417
1418         err = 0;
1419
1420         BR_INPUT_SKB_CB(skb)->igmp = 1;
1421         ih = igmp_hdr(skb2);
1422
1423         switch (ih->type) {
1424         case IGMP_HOST_MEMBERSHIP_REPORT:
1425         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1426                 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1427                 err = br_ip4_multicast_add_group(br, port, ih->group);
1428                 break;
1429         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1430                 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1431                 break;
1432         case IGMP_HOST_MEMBERSHIP_QUERY:
1433                 err = br_ip4_multicast_query(br, port, skb2);
1434                 break;
1435         case IGMP_HOST_LEAVE_MESSAGE:
1436                 br_ip4_multicast_leave_group(br, port, ih->group);
1437                 break;
1438         }
1439
1440 out:
1441         __skb_push(skb2, offset);
1442 err_out:
1443         if (skb2 != skb)
1444                 kfree_skb(skb2);
1445         return err;
1446 }
1447
1448 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1449 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1450                                  struct net_bridge_port *port,
1451                                  struct sk_buff *skb)
1452 {
1453         struct sk_buff *skb2;
1454         struct ipv6hdr *ip6h;
1455         struct icmp6hdr *icmp6h;
1456         u8 nexthdr;
1457         unsigned len;
1458         int offset;
1459         int err;
1460
1461         if (!pskb_may_pull(skb, sizeof(*ip6h)))
1462                 return -EINVAL;
1463
1464         ip6h = ipv6_hdr(skb);
1465
1466         /*
1467          * We're interested in MLD messages only.
1468          *  - Version is 6
1469          *  - MLD has always Router Alert hop-by-hop option
1470          *  - But we do not support jumbrograms.
1471          */
1472         if (ip6h->version != 6 ||
1473             ip6h->nexthdr != IPPROTO_HOPOPTS ||
1474             ip6h->payload_len == 0)
1475                 return 0;
1476
1477         len = ntohs(ip6h->payload_len);
1478         if (skb->len < len)
1479                 return -EINVAL;
1480
1481         nexthdr = ip6h->nexthdr;
1482         offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
1483
1484         if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1485                 return 0;
1486
1487         /* Okay, we found ICMPv6 header */
1488         skb2 = skb_clone(skb, GFP_ATOMIC);
1489         if (!skb2)
1490                 return -ENOMEM;
1491
1492         err = -EINVAL;
1493         if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1494                 goto out;
1495
1496         len -= offset - skb_network_offset(skb2);
1497
1498         __skb_pull(skb2, offset);
1499         skb_reset_transport_header(skb2);
1500
1501         icmp6h = icmp6_hdr(skb2);
1502
1503         switch (icmp6h->icmp6_type) {
1504         case ICMPV6_MGM_QUERY:
1505         case ICMPV6_MGM_REPORT:
1506         case ICMPV6_MGM_REDUCTION:
1507         case ICMPV6_MLD2_REPORT:
1508                 break;
1509         default:
1510                 err = 0;
1511                 goto out;
1512         }
1513
1514         /* Okay, we found MLD message. Check further. */
1515         if (skb2->len > len) {
1516                 err = pskb_trim_rcsum(skb2, len);
1517                 if (err)
1518                         goto out;
1519         }
1520
1521         switch (skb2->ip_summed) {
1522         case CHECKSUM_COMPLETE:
1523                 if (!csum_fold(skb2->csum))
1524                         break;
1525                 /*FALLTHROUGH*/
1526         case CHECKSUM_NONE:
1527                 skb2->csum = 0;
1528                 if (skb_checksum_complete(skb2))
1529                         goto out;
1530         }
1531
1532         err = 0;
1533
1534         BR_INPUT_SKB_CB(skb)->igmp = 1;
1535
1536         switch (icmp6h->icmp6_type) {
1537         case ICMPV6_MGM_REPORT:
1538             {
1539                 struct mld_msg *mld;
1540                 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1541                         err = -EINVAL;
1542                         goto out;
1543                 }
1544                 mld = (struct mld_msg *)skb_transport_header(skb2);
1545                 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1546                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1547                 break;
1548             }
1549         case ICMPV6_MLD2_REPORT:
1550                 err = br_ip6_multicast_mld2_report(br, port, skb2);
1551                 break;
1552         case ICMPV6_MGM_QUERY:
1553                 err = br_ip6_multicast_query(br, port, skb2);
1554                 break;
1555         case ICMPV6_MGM_REDUCTION:
1556             {
1557                 struct mld_msg *mld;
1558                 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1559                         err = -EINVAL;
1560                         goto out;
1561                 }
1562                 mld = (struct mld_msg *)skb_transport_header(skb2);
1563                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1564             }
1565         }
1566
1567 out:
1568         kfree_skb(skb2);
1569         return err;
1570 }
1571 #endif
1572
1573 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1574                      struct sk_buff *skb)
1575 {
1576         BR_INPUT_SKB_CB(skb)->igmp = 0;
1577         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1578
1579         if (br->multicast_disabled)
1580                 return 0;
1581
1582         switch (skb->protocol) {
1583         case htons(ETH_P_IP):
1584                 return br_multicast_ipv4_rcv(br, port, skb);
1585 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1586         case htons(ETH_P_IPV6):
1587                 return br_multicast_ipv6_rcv(br, port, skb);
1588 #endif
1589         }
1590
1591         return 0;
1592 }
1593
1594 static void br_multicast_query_expired(unsigned long data)
1595 {
1596         struct net_bridge *br = (void *)data;
1597
1598         spin_lock(&br->multicast_lock);
1599         if (br->multicast_startup_queries_sent <
1600             br->multicast_startup_query_count)
1601                 br->multicast_startup_queries_sent++;
1602
1603         br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1604
1605         spin_unlock(&br->multicast_lock);
1606 }
1607
1608 void br_multicast_init(struct net_bridge *br)
1609 {
1610         br->hash_elasticity = 4;
1611         br->hash_max = 512;
1612
1613         br->multicast_router = 1;
1614         br->multicast_last_member_count = 2;
1615         br->multicast_startup_query_count = 2;
1616
1617         br->multicast_last_member_interval = HZ;
1618         br->multicast_query_response_interval = 10 * HZ;
1619         br->multicast_startup_query_interval = 125 * HZ / 4;
1620         br->multicast_query_interval = 125 * HZ;
1621         br->multicast_querier_interval = 255 * HZ;
1622         br->multicast_membership_interval = 260 * HZ;
1623
1624         spin_lock_init(&br->multicast_lock);
1625         setup_timer(&br->multicast_router_timer,
1626                     br_multicast_local_router_expired, 0);
1627         setup_timer(&br->multicast_querier_timer,
1628                     br_multicast_local_router_expired, 0);
1629         setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1630                     (unsigned long)br);
1631 }
1632
1633 void br_multicast_open(struct net_bridge *br)
1634 {
1635         br->multicast_startup_queries_sent = 0;
1636
1637         if (br->multicast_disabled)
1638                 return;
1639
1640         mod_timer(&br->multicast_query_timer, jiffies);
1641 }
1642
1643 void br_multicast_stop(struct net_bridge *br)
1644 {
1645         struct net_bridge_mdb_htable *mdb;
1646         struct net_bridge_mdb_entry *mp;
1647         struct hlist_node *p, *n;
1648         u32 ver;
1649         int i;
1650
1651         del_timer_sync(&br->multicast_router_timer);
1652         del_timer_sync(&br->multicast_querier_timer);
1653         del_timer_sync(&br->multicast_query_timer);
1654
1655         spin_lock_bh(&br->multicast_lock);
1656         mdb = mlock_dereference(br->mdb, br);
1657         if (!mdb)
1658                 goto out;
1659
1660         br->mdb = NULL;
1661
1662         ver = mdb->ver;
1663         for (i = 0; i < mdb->max; i++) {
1664                 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1665                                           hlist[ver]) {
1666                         del_timer(&mp->timer);
1667                         del_timer(&mp->query_timer);
1668                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
1669                 }
1670         }
1671
1672         if (mdb->old) {
1673                 spin_unlock_bh(&br->multicast_lock);
1674                 rcu_barrier_bh();
1675                 spin_lock_bh(&br->multicast_lock);
1676                 WARN_ON(mdb->old);
1677         }
1678
1679         mdb->old = mdb;
1680         call_rcu_bh(&mdb->rcu, br_mdb_free);
1681
1682 out:
1683         spin_unlock_bh(&br->multicast_lock);
1684 }
1685
1686 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1687 {
1688         int err = -ENOENT;
1689
1690         spin_lock_bh(&br->multicast_lock);
1691         if (!netif_running(br->dev))
1692                 goto unlock;
1693
1694         switch (val) {
1695         case 0:
1696         case 2:
1697                 del_timer(&br->multicast_router_timer);
1698                 /* fall through */
1699         case 1:
1700                 br->multicast_router = val;
1701                 err = 0;
1702                 break;
1703
1704         default:
1705                 err = -EINVAL;
1706                 break;
1707         }
1708
1709 unlock:
1710         spin_unlock_bh(&br->multicast_lock);
1711
1712         return err;
1713 }
1714
1715 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1716 {
1717         struct net_bridge *br = p->br;
1718         int err = -ENOENT;
1719
1720         spin_lock(&br->multicast_lock);
1721         if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1722                 goto unlock;
1723
1724         switch (val) {
1725         case 0:
1726         case 1:
1727         case 2:
1728                 p->multicast_router = val;
1729                 err = 0;
1730
1731                 if (val < 2 && !hlist_unhashed(&p->rlist))
1732                         hlist_del_init_rcu(&p->rlist);
1733
1734                 if (val == 1)
1735                         break;
1736
1737                 del_timer(&p->multicast_router_timer);
1738
1739                 if (val == 0)
1740                         break;
1741
1742                 br_multicast_add_router(br, p);
1743                 break;
1744
1745         default:
1746                 err = -EINVAL;
1747                 break;
1748         }
1749
1750 unlock:
1751         spin_unlock(&br->multicast_lock);
1752
1753         return err;
1754 }
1755
1756 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1757 {
1758         struct net_bridge_port *port;
1759         int err = 0;
1760         struct net_bridge_mdb_htable *mdb;
1761
1762         spin_lock(&br->multicast_lock);
1763         if (br->multicast_disabled == !val)
1764                 goto unlock;
1765
1766         br->multicast_disabled = !val;
1767         if (br->multicast_disabled)
1768                 goto unlock;
1769
1770         if (!netif_running(br->dev))
1771                 goto unlock;
1772
1773         mdb = mlock_dereference(br->mdb, br);
1774         if (mdb) {
1775                 if (mdb->old) {
1776                         err = -EEXIST;
1777 rollback:
1778                         br->multicast_disabled = !!val;
1779                         goto unlock;
1780                 }
1781
1782                 err = br_mdb_rehash(&br->mdb, mdb->max,
1783                                     br->hash_elasticity);
1784                 if (err)
1785                         goto rollback;
1786         }
1787
1788         br_multicast_open(br);
1789         list_for_each_entry(port, &br->port_list, list) {
1790                 if (port->state == BR_STATE_DISABLED ||
1791                     port->state == BR_STATE_BLOCKING)
1792                         continue;
1793
1794                 __br_multicast_enable_port(port);
1795         }
1796
1797 unlock:
1798         spin_unlock(&br->multicast_lock);
1799
1800         return err;
1801 }
1802
1803 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1804 {
1805         int err = -ENOENT;
1806         u32 old;
1807         struct net_bridge_mdb_htable *mdb;
1808
1809         spin_lock(&br->multicast_lock);
1810         if (!netif_running(br->dev))
1811                 goto unlock;
1812
1813         err = -EINVAL;
1814         if (!is_power_of_2(val))
1815                 goto unlock;
1816
1817         mdb = mlock_dereference(br->mdb, br);
1818         if (mdb && val < mdb->size)
1819                 goto unlock;
1820
1821         err = 0;
1822
1823         old = br->hash_max;
1824         br->hash_max = val;
1825
1826         if (mdb) {
1827                 if (mdb->old) {
1828                         err = -EEXIST;
1829 rollback:
1830                         br->hash_max = old;
1831                         goto unlock;
1832                 }
1833
1834                 err = br_mdb_rehash(&br->mdb, br->hash_max,
1835                                     br->hash_elasticity);
1836                 if (err)
1837                         goto rollback;
1838         }
1839
1840 unlock:
1841         spin_unlock(&br->multicast_lock);
1842
1843         return err;
1844 }