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[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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
28 #include <net/ipv6.h>
29 #include <net/mld.h>
30 #include <net/addrconf.h>
31 #endif
32
33 #include "br_private.h"
34
35 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
36 static inline int ipv6_is_local_multicast(const struct in6_addr *addr)
37 {
38 if (ipv6_addr_is_multicast(addr) &&
39 IPV6_ADDR_MC_SCOPE(addr) <= IPV6_ADDR_SCOPE_LINKLOCAL)
40 return 1;
41 return 0;
42 }
43 #endif
44
45 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
46 {
47 if (a->proto != b->proto)
48 return 0;
49 switch (a->proto) {
50 case htons(ETH_P_IP):
51 return a->u.ip4 == b->u.ip4;
52 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
53 case htons(ETH_P_IPV6):
54 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
55 #endif
56 }
57 return 0;
58 }
59
60 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
61 {
62 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
63 }
64
65 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
66 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
67 const struct in6_addr *ip)
68 {
69 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
70 }
71 #endif
72
73 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
74 struct br_ip *ip)
75 {
76 switch (ip->proto) {
77 case htons(ETH_P_IP):
78 return __br_ip4_hash(mdb, ip->u.ip4);
79 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
80 case htons(ETH_P_IPV6):
81 return __br_ip6_hash(mdb, &ip->u.ip6);
82 #endif
83 }
84 return 0;
85 }
86
87 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
88 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
89 {
90 struct net_bridge_mdb_entry *mp;
91 struct hlist_node *p;
92
93 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
94 if (br_ip_equal(&mp->addr, dst))
95 return mp;
96 }
97
98 return NULL;
99 }
100
101 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
102 struct net_bridge_mdb_htable *mdb, __be32 dst)
103 {
104 struct br_ip br_dst;
105
106 br_dst.u.ip4 = dst;
107 br_dst.proto = htons(ETH_P_IP);
108
109 return __br_mdb_ip_get(mdb, &br_dst, __br_ip4_hash(mdb, dst));
110 }
111
112 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
113 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
114 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
115 {
116 struct br_ip br_dst;
117
118 ipv6_addr_copy(&br_dst.u.ip6, dst);
119 br_dst.proto = htons(ETH_P_IPV6);
120
121 return __br_mdb_ip_get(mdb, &br_dst, __br_ip6_hash(mdb, dst));
122 }
123 #endif
124
125 static struct net_bridge_mdb_entry *br_mdb_ip_get(
126 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
127 {
128 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
129 }
130
131 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
132 struct sk_buff *skb)
133 {
134 struct net_bridge_mdb_htable *mdb = br->mdb;
135 struct br_ip ip;
136
137 if (!mdb || br->multicast_disabled)
138 return NULL;
139
140 if (BR_INPUT_SKB_CB(skb)->igmp)
141 return NULL;
142
143 ip.proto = skb->protocol;
144
145 switch (skb->protocol) {
146 case htons(ETH_P_IP):
147 ip.u.ip4 = ip_hdr(skb)->daddr;
148 break;
149 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
150 case htons(ETH_P_IPV6):
151 ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr);
152 break;
153 #endif
154 default:
155 return NULL;
156 }
157
158 return br_mdb_ip_get(mdb, &ip);
159 }
160
161 static void br_mdb_free(struct rcu_head *head)
162 {
163 struct net_bridge_mdb_htable *mdb =
164 container_of(head, struct net_bridge_mdb_htable, rcu);
165 struct net_bridge_mdb_htable *old = mdb->old;
166
167 mdb->old = NULL;
168 kfree(old->mhash);
169 kfree(old);
170 }
171
172 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
173 struct net_bridge_mdb_htable *old,
174 int elasticity)
175 {
176 struct net_bridge_mdb_entry *mp;
177 struct hlist_node *p;
178 int maxlen;
179 int len;
180 int i;
181
182 for (i = 0; i < old->max; i++)
183 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
184 hlist_add_head(&mp->hlist[new->ver],
185 &new->mhash[br_ip_hash(new, &mp->addr)]);
186
187 if (!elasticity)
188 return 0;
189
190 maxlen = 0;
191 for (i = 0; i < new->max; i++) {
192 len = 0;
193 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
194 len++;
195 if (len > maxlen)
196 maxlen = len;
197 }
198
199 return maxlen > elasticity ? -EINVAL : 0;
200 }
201
202 static void br_multicast_free_pg(struct rcu_head *head)
203 {
204 struct net_bridge_port_group *p =
205 container_of(head, struct net_bridge_port_group, rcu);
206
207 kfree(p);
208 }
209
210 static void br_multicast_free_group(struct rcu_head *head)
211 {
212 struct net_bridge_mdb_entry *mp =
213 container_of(head, struct net_bridge_mdb_entry, rcu);
214
215 kfree(mp);
216 }
217
218 static void br_multicast_group_expired(unsigned long data)
219 {
220 struct net_bridge_mdb_entry *mp = (void *)data;
221 struct net_bridge *br = mp->br;
222 struct net_bridge_mdb_htable *mdb;
223
224 spin_lock(&br->multicast_lock);
225 if (!netif_running(br->dev) || timer_pending(&mp->timer))
226 goto out;
227
228 if (!hlist_unhashed(&mp->mglist))
229 hlist_del_init(&mp->mglist);
230
231 if (mp->ports)
232 goto out;
233
234 mdb = br->mdb;
235 hlist_del_rcu(&mp->hlist[mdb->ver]);
236 mdb->size--;
237
238 del_timer(&mp->query_timer);
239 call_rcu_bh(&mp->rcu, br_multicast_free_group);
240
241 out:
242 spin_unlock(&br->multicast_lock);
243 }
244
245 static void br_multicast_del_pg(struct net_bridge *br,
246 struct net_bridge_port_group *pg)
247 {
248 struct net_bridge_mdb_htable *mdb = br->mdb;
249 struct net_bridge_mdb_entry *mp;
250 struct net_bridge_port_group *p;
251 struct net_bridge_port_group **pp;
252
253 mp = br_mdb_ip_get(mdb, &pg->addr);
254 if (WARN_ON(!mp))
255 return;
256
257 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
258 if (p != pg)
259 continue;
260
261 *pp = p->next;
262 hlist_del_init(&p->mglist);
263 del_timer(&p->timer);
264 del_timer(&p->query_timer);
265 call_rcu_bh(&p->rcu, br_multicast_free_pg);
266
267 if (!mp->ports && hlist_unhashed(&mp->mglist) &&
268 netif_running(br->dev))
269 mod_timer(&mp->timer, jiffies);
270
271 return;
272 }
273
274 WARN_ON(1);
275 }
276
277 static void br_multicast_port_group_expired(unsigned long data)
278 {
279 struct net_bridge_port_group *pg = (void *)data;
280 struct net_bridge *br = pg->port->br;
281
282 spin_lock(&br->multicast_lock);
283 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
284 hlist_unhashed(&pg->mglist))
285 goto out;
286
287 br_multicast_del_pg(br, pg);
288
289 out:
290 spin_unlock(&br->multicast_lock);
291 }
292
293 static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max,
294 int elasticity)
295 {
296 struct net_bridge_mdb_htable *old = *mdbp;
297 struct net_bridge_mdb_htable *mdb;
298 int err;
299
300 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
301 if (!mdb)
302 return -ENOMEM;
303
304 mdb->max = max;
305 mdb->old = old;
306
307 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
308 if (!mdb->mhash) {
309 kfree(mdb);
310 return -ENOMEM;
311 }
312
313 mdb->size = old ? old->size : 0;
314 mdb->ver = old ? old->ver ^ 1 : 0;
315
316 if (!old || elasticity)
317 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
318 else
319 mdb->secret = old->secret;
320
321 if (!old)
322 goto out;
323
324 err = br_mdb_copy(mdb, old, elasticity);
325 if (err) {
326 kfree(mdb->mhash);
327 kfree(mdb);
328 return err;
329 }
330
331 call_rcu_bh(&mdb->rcu, br_mdb_free);
332
333 out:
334 rcu_assign_pointer(*mdbp, mdb);
335
336 return 0;
337 }
338
339 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
340 __be32 group)
341 {
342 struct sk_buff *skb;
343 struct igmphdr *ih;
344 struct ethhdr *eth;
345 struct iphdr *iph;
346
347 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
348 sizeof(*ih) + 4);
349 if (!skb)
350 goto out;
351
352 skb->protocol = htons(ETH_P_IP);
353
354 skb_reset_mac_header(skb);
355 eth = eth_hdr(skb);
356
357 memcpy(eth->h_source, br->dev->dev_addr, 6);
358 eth->h_dest[0] = 1;
359 eth->h_dest[1] = 0;
360 eth->h_dest[2] = 0x5e;
361 eth->h_dest[3] = 0;
362 eth->h_dest[4] = 0;
363 eth->h_dest[5] = 1;
364 eth->h_proto = htons(ETH_P_IP);
365 skb_put(skb, sizeof(*eth));
366
367 skb_set_network_header(skb, skb->len);
368 iph = ip_hdr(skb);
369
370 iph->version = 4;
371 iph->ihl = 6;
372 iph->tos = 0xc0;
373 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
374 iph->id = 0;
375 iph->frag_off = htons(IP_DF);
376 iph->ttl = 1;
377 iph->protocol = IPPROTO_IGMP;
378 iph->saddr = 0;
379 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
380 ((u8 *)&iph[1])[0] = IPOPT_RA;
381 ((u8 *)&iph[1])[1] = 4;
382 ((u8 *)&iph[1])[2] = 0;
383 ((u8 *)&iph[1])[3] = 0;
384 ip_send_check(iph);
385 skb_put(skb, 24);
386
387 skb_set_transport_header(skb, skb->len);
388 ih = igmp_hdr(skb);
389 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
390 ih->code = (group ? br->multicast_last_member_interval :
391 br->multicast_query_response_interval) /
392 (HZ / IGMP_TIMER_SCALE);
393 ih->group = group;
394 ih->csum = 0;
395 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
396 skb_put(skb, sizeof(*ih));
397
398 __skb_pull(skb, sizeof(*eth));
399
400 out:
401 return skb;
402 }
403
404 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
405 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
406 struct in6_addr *group)
407 {
408 struct sk_buff *skb;
409 struct ipv6hdr *ip6h;
410 struct mld_msg *mldq;
411 struct ethhdr *eth;
412 u8 *hopopt;
413 unsigned long interval;
414
415 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
416 8 + sizeof(*mldq));
417 if (!skb)
418 goto out;
419
420 skb->protocol = htons(ETH_P_IPV6);
421
422 /* Ethernet header */
423 skb_reset_mac_header(skb);
424 eth = eth_hdr(skb);
425
426 memcpy(eth->h_source, br->dev->dev_addr, 6);
427 ipv6_eth_mc_map(group, eth->h_dest);
428 eth->h_proto = htons(ETH_P_IPV6);
429 skb_put(skb, sizeof(*eth));
430
431 /* IPv6 header + HbH option */
432 skb_set_network_header(skb, skb->len);
433 ip6h = ipv6_hdr(skb);
434
435 *(__force __be32 *)ip6h = htonl(0x60000000);
436 ip6h->payload_len = 8 + sizeof(*mldq);
437 ip6h->nexthdr = IPPROTO_HOPOPTS;
438 ip6h->hop_limit = 1;
439 ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0);
440 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
441
442 hopopt = (u8 *)(ip6h + 1);
443 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
444 hopopt[1] = 0; /* length of HbH */
445 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
446 hopopt[3] = 2; /* Length of RA Option */
447 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
448 hopopt[5] = 0;
449 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */
450 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */
451
452 skb_put(skb, sizeof(*ip6h) + 8);
453
454 /* ICMPv6 */
455 skb_set_transport_header(skb, skb->len);
456 mldq = (struct mld_msg *) icmp6_hdr(skb);
457
458 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
459 br->multicast_query_response_interval;
460
461 mldq->mld_type = ICMPV6_MGM_QUERY;
462 mldq->mld_code = 0;
463 mldq->mld_cksum = 0;
464 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
465 mldq->mld_reserved = 0;
466 ipv6_addr_copy(&mldq->mld_mca, group);
467
468 /* checksum */
469 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
470 sizeof(*mldq), IPPROTO_ICMPV6,
471 csum_partial(mldq,
472 sizeof(*mldq), 0));
473 skb_put(skb, sizeof(*mldq));
474
475 __skb_pull(skb, sizeof(*eth));
476
477 out:
478 return skb;
479 }
480 #endif
481
482 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
483 struct br_ip *addr)
484 {
485 switch (addr->proto) {
486 case htons(ETH_P_IP):
487 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
488 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
489 case htons(ETH_P_IPV6):
490 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
491 #endif
492 }
493 return NULL;
494 }
495
496 static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
497 {
498 struct net_bridge *br = mp->br;
499 struct sk_buff *skb;
500
501 skb = br_multicast_alloc_query(br, &mp->addr);
502 if (!skb)
503 goto timer;
504
505 netif_rx(skb);
506
507 timer:
508 if (++mp->queries_sent < br->multicast_last_member_count)
509 mod_timer(&mp->query_timer,
510 jiffies + br->multicast_last_member_interval);
511 }
512
513 static void br_multicast_group_query_expired(unsigned long data)
514 {
515 struct net_bridge_mdb_entry *mp = (void *)data;
516 struct net_bridge *br = mp->br;
517
518 spin_lock(&br->multicast_lock);
519 if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
520 mp->queries_sent >= br->multicast_last_member_count)
521 goto out;
522
523 br_multicast_send_group_query(mp);
524
525 out:
526 spin_unlock(&br->multicast_lock);
527 }
528
529 static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
530 {
531 struct net_bridge_port *port = pg->port;
532 struct net_bridge *br = port->br;
533 struct sk_buff *skb;
534
535 skb = br_multicast_alloc_query(br, &pg->addr);
536 if (!skb)
537 goto timer;
538
539 br_deliver(port, skb);
540
541 timer:
542 if (++pg->queries_sent < br->multicast_last_member_count)
543 mod_timer(&pg->query_timer,
544 jiffies + br->multicast_last_member_interval);
545 }
546
547 static void br_multicast_port_group_query_expired(unsigned long data)
548 {
549 struct net_bridge_port_group *pg = (void *)data;
550 struct net_bridge_port *port = pg->port;
551 struct net_bridge *br = port->br;
552
553 spin_lock(&br->multicast_lock);
554 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
555 pg->queries_sent >= br->multicast_last_member_count)
556 goto out;
557
558 br_multicast_send_port_group_query(pg);
559
560 out:
561 spin_unlock(&br->multicast_lock);
562 }
563
564 static struct net_bridge_mdb_entry *br_multicast_get_group(
565 struct net_bridge *br, struct net_bridge_port *port,
566 struct br_ip *group, int hash)
567 {
568 struct net_bridge_mdb_htable *mdb = br->mdb;
569 struct net_bridge_mdb_entry *mp;
570 struct hlist_node *p;
571 unsigned count = 0;
572 unsigned max;
573 int elasticity;
574 int err;
575
576 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
577 count++;
578 if (unlikely(br_ip_equal(group, &mp->addr)))
579 return mp;
580 }
581
582 elasticity = 0;
583 max = mdb->max;
584
585 if (unlikely(count > br->hash_elasticity && count)) {
586 if (net_ratelimit())
587 printk(KERN_INFO "%s: Multicast hash table "
588 "chain limit reached: %s\n",
589 br->dev->name, port ? port->dev->name :
590 br->dev->name);
591
592 elasticity = br->hash_elasticity;
593 }
594
595 if (mdb->size >= max) {
596 max *= 2;
597 if (unlikely(max >= br->hash_max)) {
598 printk(KERN_WARNING "%s: Multicast hash table maximum "
599 "reached, disabling snooping: %s, %d\n",
600 br->dev->name, port ? port->dev->name :
601 br->dev->name,
602 max);
603 err = -E2BIG;
604 disable:
605 br->multicast_disabled = 1;
606 goto err;
607 }
608 }
609
610 if (max > mdb->max || elasticity) {
611 if (mdb->old) {
612 if (net_ratelimit())
613 printk(KERN_INFO "%s: Multicast hash table "
614 "on fire: %s\n",
615 br->dev->name, port ? port->dev->name :
616 br->dev->name);
617 err = -EEXIST;
618 goto err;
619 }
620
621 err = br_mdb_rehash(&br->mdb, max, elasticity);
622 if (err) {
623 printk(KERN_WARNING "%s: Cannot rehash multicast "
624 "hash table, disabling snooping: "
625 "%s, %d, %d\n",
626 br->dev->name, port ? port->dev->name :
627 br->dev->name,
628 mdb->size, err);
629 goto disable;
630 }
631
632 err = -EAGAIN;
633 goto err;
634 }
635
636 return NULL;
637
638 err:
639 mp = ERR_PTR(err);
640 return mp;
641 }
642
643 static struct net_bridge_mdb_entry *br_multicast_new_group(
644 struct net_bridge *br, struct net_bridge_port *port,
645 struct br_ip *group)
646 {
647 struct net_bridge_mdb_htable *mdb = br->mdb;
648 struct net_bridge_mdb_entry *mp;
649 int hash;
650
651 if (!mdb) {
652 if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0))
653 return NULL;
654 goto rehash;
655 }
656
657 hash = br_ip_hash(mdb, group);
658 mp = br_multicast_get_group(br, port, group, hash);
659 switch (PTR_ERR(mp)) {
660 case 0:
661 break;
662
663 case -EAGAIN:
664 rehash:
665 mdb = br->mdb;
666 hash = br_ip_hash(mdb, group);
667 break;
668
669 default:
670 goto out;
671 }
672
673 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
674 if (unlikely(!mp))
675 goto out;
676
677 mp->br = br;
678 mp->addr = *group;
679 setup_timer(&mp->timer, br_multicast_group_expired,
680 (unsigned long)mp);
681 setup_timer(&mp->query_timer, br_multicast_group_query_expired,
682 (unsigned long)mp);
683
684 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
685 mdb->size++;
686
687 out:
688 return mp;
689 }
690
691 static int br_multicast_add_group(struct net_bridge *br,
692 struct net_bridge_port *port,
693 struct br_ip *group)
694 {
695 struct net_bridge_mdb_entry *mp;
696 struct net_bridge_port_group *p;
697 struct net_bridge_port_group **pp;
698 unsigned long now = jiffies;
699 int err;
700
701 spin_lock(&br->multicast_lock);
702 if (!netif_running(br->dev) ||
703 (port && port->state == BR_STATE_DISABLED))
704 goto out;
705
706 mp = br_multicast_new_group(br, port, group);
707 err = PTR_ERR(mp);
708 if (unlikely(IS_ERR(mp) || !mp))
709 goto err;
710
711 if (!port) {
712 hlist_add_head(&mp->mglist, &br->mglist);
713 mod_timer(&mp->timer, now + br->multicast_membership_interval);
714 goto out;
715 }
716
717 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
718 if (p->port == port)
719 goto found;
720 if ((unsigned long)p->port < (unsigned long)port)
721 break;
722 }
723
724 p = kzalloc(sizeof(*p), GFP_ATOMIC);
725 err = -ENOMEM;
726 if (unlikely(!p))
727 goto err;
728
729 p->addr = *group;
730 p->port = port;
731 p->next = *pp;
732 hlist_add_head(&p->mglist, &port->mglist);
733 setup_timer(&p->timer, br_multicast_port_group_expired,
734 (unsigned long)p);
735 setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
736 (unsigned long)p);
737
738 rcu_assign_pointer(*pp, p);
739
740 found:
741 mod_timer(&p->timer, now + br->multicast_membership_interval);
742 out:
743 err = 0;
744
745 err:
746 spin_unlock(&br->multicast_lock);
747 return err;
748 }
749
750 static int br_ip4_multicast_add_group(struct net_bridge *br,
751 struct net_bridge_port *port,
752 __be32 group)
753 {
754 struct br_ip br_group;
755
756 if (ipv4_is_local_multicast(group))
757 return 0;
758
759 br_group.u.ip4 = group;
760 br_group.proto = htons(ETH_P_IP);
761
762 return br_multicast_add_group(br, port, &br_group);
763 }
764
765 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
766 static int br_ip6_multicast_add_group(struct net_bridge *br,
767 struct net_bridge_port *port,
768 const struct in6_addr *group)
769 {
770 struct br_ip br_group;
771
772 if (ipv6_is_local_multicast(group))
773 return 0;
774
775 ipv6_addr_copy(&br_group.u.ip6, group);
776 br_group.proto = htons(ETH_P_IP);
777
778 return br_multicast_add_group(br, port, &br_group);
779 }
780 #endif
781
782 static void br_multicast_router_expired(unsigned long data)
783 {
784 struct net_bridge_port *port = (void *)data;
785 struct net_bridge *br = port->br;
786
787 spin_lock(&br->multicast_lock);
788 if (port->multicast_router != 1 ||
789 timer_pending(&port->multicast_router_timer) ||
790 hlist_unhashed(&port->rlist))
791 goto out;
792
793 hlist_del_init_rcu(&port->rlist);
794
795 out:
796 spin_unlock(&br->multicast_lock);
797 }
798
799 static void br_multicast_local_router_expired(unsigned long data)
800 {
801 }
802
803 static void __br_multicast_send_query(struct net_bridge *br,
804 struct net_bridge_port *port,
805 struct br_ip *ip)
806 {
807 struct sk_buff *skb;
808
809 skb = br_multicast_alloc_query(br, ip);
810 if (!skb)
811 return;
812
813 if (port) {
814 __skb_push(skb, sizeof(struct ethhdr));
815 skb->dev = port->dev;
816 NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
817 dev_queue_xmit);
818 } else
819 netif_rx(skb);
820 }
821
822 static void br_multicast_send_query(struct net_bridge *br,
823 struct net_bridge_port *port, u32 sent)
824 {
825 unsigned long time;
826 struct br_ip br_group;
827
828 if (!netif_running(br->dev) || br->multicast_disabled ||
829 timer_pending(&br->multicast_querier_timer))
830 return;
831
832 memset(&br_group.u, 0, sizeof(br_group.u));
833
834 br_group.proto = htons(ETH_P_IP);
835 __br_multicast_send_query(br, port, &br_group);
836
837 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
838 br_group.proto = htons(ETH_P_IPV6);
839 __br_multicast_send_query(br, port, &br_group);
840 #endif
841
842 time = jiffies;
843 time += sent < br->multicast_startup_query_count ?
844 br->multicast_startup_query_interval :
845 br->multicast_query_interval;
846 mod_timer(port ? &port->multicast_query_timer :
847 &br->multicast_query_timer, time);
848 }
849
850 static void br_multicast_port_query_expired(unsigned long data)
851 {
852 struct net_bridge_port *port = (void *)data;
853 struct net_bridge *br = port->br;
854
855 spin_lock(&br->multicast_lock);
856 if (port->state == BR_STATE_DISABLED ||
857 port->state == BR_STATE_BLOCKING)
858 goto out;
859
860 if (port->multicast_startup_queries_sent <
861 br->multicast_startup_query_count)
862 port->multicast_startup_queries_sent++;
863
864 br_multicast_send_query(port->br, port,
865 port->multicast_startup_queries_sent);
866
867 out:
868 spin_unlock(&br->multicast_lock);
869 }
870
871 void br_multicast_add_port(struct net_bridge_port *port)
872 {
873 port->multicast_router = 1;
874
875 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
876 (unsigned long)port);
877 setup_timer(&port->multicast_query_timer,
878 br_multicast_port_query_expired, (unsigned long)port);
879 }
880
881 void br_multicast_del_port(struct net_bridge_port *port)
882 {
883 del_timer_sync(&port->multicast_router_timer);
884 }
885
886 static void __br_multicast_enable_port(struct net_bridge_port *port)
887 {
888 port->multicast_startup_queries_sent = 0;
889
890 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
891 del_timer(&port->multicast_query_timer))
892 mod_timer(&port->multicast_query_timer, jiffies);
893 }
894
895 void br_multicast_enable_port(struct net_bridge_port *port)
896 {
897 struct net_bridge *br = port->br;
898
899 spin_lock(&br->multicast_lock);
900 if (br->multicast_disabled || !netif_running(br->dev))
901 goto out;
902
903 __br_multicast_enable_port(port);
904
905 out:
906 spin_unlock(&br->multicast_lock);
907 }
908
909 void br_multicast_disable_port(struct net_bridge_port *port)
910 {
911 struct net_bridge *br = port->br;
912 struct net_bridge_port_group *pg;
913 struct hlist_node *p, *n;
914
915 spin_lock(&br->multicast_lock);
916 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
917 br_multicast_del_pg(br, pg);
918
919 if (!hlist_unhashed(&port->rlist))
920 hlist_del_init_rcu(&port->rlist);
921 del_timer(&port->multicast_router_timer);
922 del_timer(&port->multicast_query_timer);
923 spin_unlock(&br->multicast_lock);
924 }
925
926 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
927 struct net_bridge_port *port,
928 struct sk_buff *skb)
929 {
930 struct igmpv3_report *ih;
931 struct igmpv3_grec *grec;
932 int i;
933 int len;
934 int num;
935 int type;
936 int err = 0;
937 __be32 group;
938
939 if (!pskb_may_pull(skb, sizeof(*ih)))
940 return -EINVAL;
941
942 ih = igmpv3_report_hdr(skb);
943 num = ntohs(ih->ngrec);
944 len = sizeof(*ih);
945
946 for (i = 0; i < num; i++) {
947 len += sizeof(*grec);
948 if (!pskb_may_pull(skb, len))
949 return -EINVAL;
950
951 grec = (void *)(skb->data + len - sizeof(*grec));
952 group = grec->grec_mca;
953 type = grec->grec_type;
954
955 len += ntohs(grec->grec_nsrcs) * 4;
956 if (!pskb_may_pull(skb, len))
957 return -EINVAL;
958
959 /* We treat this as an IGMPv2 report for now. */
960 switch (type) {
961 case IGMPV3_MODE_IS_INCLUDE:
962 case IGMPV3_MODE_IS_EXCLUDE:
963 case IGMPV3_CHANGE_TO_INCLUDE:
964 case IGMPV3_CHANGE_TO_EXCLUDE:
965 case IGMPV3_ALLOW_NEW_SOURCES:
966 case IGMPV3_BLOCK_OLD_SOURCES:
967 break;
968
969 default:
970 continue;
971 }
972
973 err = br_ip4_multicast_add_group(br, port, group);
974 if (err)
975 break;
976 }
977
978 return err;
979 }
980
981 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
982 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
983 struct net_bridge_port *port,
984 struct sk_buff *skb)
985 {
986 struct icmp6hdr *icmp6h;
987 struct mld2_grec *grec;
988 int i;
989 int len;
990 int num;
991 int err = 0;
992
993 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
994 return -EINVAL;
995
996 icmp6h = icmp6_hdr(skb);
997 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
998 len = sizeof(*icmp6h);
999
1000 for (i = 0; i < num; i++) {
1001 __be16 *nsrcs, _nsrcs;
1002
1003 nsrcs = skb_header_pointer(skb,
1004 len + offsetof(struct mld2_grec,
1005 grec_mca),
1006 sizeof(_nsrcs), &_nsrcs);
1007 if (!nsrcs)
1008 return -EINVAL;
1009
1010 if (!pskb_may_pull(skb,
1011 len + sizeof(*grec) +
1012 sizeof(struct in6_addr) * (*nsrcs)))
1013 return -EINVAL;
1014
1015 grec = (struct mld2_grec *)(skb->data + len);
1016 len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs);
1017
1018 /* We treat these as MLDv1 reports for now. */
1019 switch (grec->grec_type) {
1020 case MLD2_MODE_IS_INCLUDE:
1021 case MLD2_MODE_IS_EXCLUDE:
1022 case MLD2_CHANGE_TO_INCLUDE:
1023 case MLD2_CHANGE_TO_EXCLUDE:
1024 case MLD2_ALLOW_NEW_SOURCES:
1025 case MLD2_BLOCK_OLD_SOURCES:
1026 break;
1027
1028 default:
1029 continue;
1030 }
1031
1032 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
1033 if (!err)
1034 break;
1035 }
1036
1037 return err;
1038 }
1039 #endif
1040
1041 static void br_multicast_add_router(struct net_bridge *br,
1042 struct net_bridge_port *port)
1043 {
1044 struct hlist_node *p;
1045 struct hlist_node **h;
1046
1047 for (h = &br->router_list.first;
1048 (p = *h) &&
1049 (unsigned long)container_of(p, struct net_bridge_port, rlist) >
1050 (unsigned long)port;
1051 h = &p->next)
1052 ;
1053
1054 port->rlist.pprev = h;
1055 port->rlist.next = p;
1056 rcu_assign_pointer(*h, &port->rlist);
1057 if (p)
1058 p->pprev = &port->rlist.next;
1059 }
1060
1061 static void br_multicast_mark_router(struct net_bridge *br,
1062 struct net_bridge_port *port)
1063 {
1064 unsigned long now = jiffies;
1065
1066 if (!port) {
1067 if (br->multicast_router == 1)
1068 mod_timer(&br->multicast_router_timer,
1069 now + br->multicast_querier_interval);
1070 return;
1071 }
1072
1073 if (port->multicast_router != 1)
1074 return;
1075
1076 if (!hlist_unhashed(&port->rlist))
1077 goto timer;
1078
1079 br_multicast_add_router(br, port);
1080
1081 timer:
1082 mod_timer(&port->multicast_router_timer,
1083 now + br->multicast_querier_interval);
1084 }
1085
1086 static void br_multicast_query_received(struct net_bridge *br,
1087 struct net_bridge_port *port,
1088 int saddr)
1089 {
1090 if (saddr)
1091 mod_timer(&br->multicast_querier_timer,
1092 jiffies + br->multicast_querier_interval);
1093 else if (timer_pending(&br->multicast_querier_timer))
1094 return;
1095
1096 br_multicast_mark_router(br, port);
1097 }
1098
1099 static int br_ip4_multicast_query(struct net_bridge *br,
1100 struct net_bridge_port *port,
1101 struct sk_buff *skb)
1102 {
1103 struct iphdr *iph = ip_hdr(skb);
1104 struct igmphdr *ih = igmp_hdr(skb);
1105 struct net_bridge_mdb_entry *mp;
1106 struct igmpv3_query *ih3;
1107 struct net_bridge_port_group *p;
1108 struct net_bridge_port_group **pp;
1109 unsigned long max_delay;
1110 unsigned long now = jiffies;
1111 __be32 group;
1112 int err = 0;
1113
1114 spin_lock(&br->multicast_lock);
1115 if (!netif_running(br->dev) ||
1116 (port && port->state == BR_STATE_DISABLED))
1117 goto out;
1118
1119 br_multicast_query_received(br, port, !!iph->saddr);
1120
1121 group = ih->group;
1122
1123 if (skb->len == sizeof(*ih)) {
1124 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1125
1126 if (!max_delay) {
1127 max_delay = 10 * HZ;
1128 group = 0;
1129 }
1130 } else {
1131 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1132 err = -EINVAL;
1133 goto out;
1134 }
1135
1136 ih3 = igmpv3_query_hdr(skb);
1137 if (ih3->nsrcs)
1138 goto out;
1139
1140 max_delay = ih3->code ?
1141 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1142 }
1143
1144 if (!group)
1145 goto out;
1146
1147 mp = br_mdb_ip4_get(br->mdb, group);
1148 if (!mp)
1149 goto out;
1150
1151 max_delay *= br->multicast_last_member_count;
1152
1153 if (!hlist_unhashed(&mp->mglist) &&
1154 (timer_pending(&mp->timer) ?
1155 time_after(mp->timer.expires, now + max_delay) :
1156 try_to_del_timer_sync(&mp->timer) >= 0))
1157 mod_timer(&mp->timer, now + max_delay);
1158
1159 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
1160 if (timer_pending(&p->timer) ?
1161 time_after(p->timer.expires, now + max_delay) :
1162 try_to_del_timer_sync(&p->timer) >= 0)
1163 mod_timer(&mp->timer, now + max_delay);
1164 }
1165
1166 out:
1167 spin_unlock(&br->multicast_lock);
1168 return err;
1169 }
1170
1171 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1172 static int br_ip6_multicast_query(struct net_bridge *br,
1173 struct net_bridge_port *port,
1174 struct sk_buff *skb)
1175 {
1176 struct ipv6hdr *ip6h = ipv6_hdr(skb);
1177 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1178 struct net_bridge_mdb_entry *mp;
1179 struct mld2_query *mld2q;
1180 struct net_bridge_port_group *p, **pp;
1181 unsigned long max_delay;
1182 unsigned long now = jiffies;
1183 struct in6_addr *group = NULL;
1184 int err = 0;
1185
1186 spin_lock(&br->multicast_lock);
1187 if (!netif_running(br->dev) ||
1188 (port && port->state == BR_STATE_DISABLED))
1189 goto out;
1190
1191 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1192
1193 if (skb->len == sizeof(*mld)) {
1194 if (!pskb_may_pull(skb, sizeof(*mld))) {
1195 err = -EINVAL;
1196 goto out;
1197 }
1198 mld = (struct mld_msg *) icmp6_hdr(skb);
1199 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
1200 if (max_delay)
1201 group = &mld->mld_mca;
1202 } else if (skb->len >= sizeof(*mld2q)) {
1203 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1204 err = -EINVAL;
1205 goto out;
1206 }
1207 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1208 if (!mld2q->mld2q_nsrcs)
1209 group = &mld2q->mld2q_mca;
1210 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1211 }
1212
1213 if (!group)
1214 goto out;
1215
1216 mp = br_mdb_ip6_get(br->mdb, group);
1217 if (!mp)
1218 goto out;
1219
1220 max_delay *= br->multicast_last_member_count;
1221 if (!hlist_unhashed(&mp->mglist) &&
1222 (timer_pending(&mp->timer) ?
1223 time_after(mp->timer.expires, now + max_delay) :
1224 try_to_del_timer_sync(&mp->timer) >= 0))
1225 mod_timer(&mp->timer, now + max_delay);
1226
1227 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
1228 if (timer_pending(&p->timer) ?
1229 time_after(p->timer.expires, now + max_delay) :
1230 try_to_del_timer_sync(&p->timer) >= 0)
1231 mod_timer(&mp->timer, now + max_delay);
1232 }
1233
1234 out:
1235 spin_unlock(&br->multicast_lock);
1236 return err;
1237 }
1238 #endif
1239
1240 static void br_multicast_leave_group(struct net_bridge *br,
1241 struct net_bridge_port *port,
1242 struct br_ip *group)
1243 {
1244 struct net_bridge_mdb_htable *mdb;
1245 struct net_bridge_mdb_entry *mp;
1246 struct net_bridge_port_group *p;
1247 unsigned long now;
1248 unsigned long time;
1249
1250 spin_lock(&br->multicast_lock);
1251 if (!netif_running(br->dev) ||
1252 (port && port->state == BR_STATE_DISABLED) ||
1253 timer_pending(&br->multicast_querier_timer))
1254 goto out;
1255
1256 mdb = br->mdb;
1257 mp = br_mdb_ip_get(mdb, group);
1258 if (!mp)
1259 goto out;
1260
1261 now = jiffies;
1262 time = now + br->multicast_last_member_count *
1263 br->multicast_last_member_interval;
1264
1265 if (!port) {
1266 if (!hlist_unhashed(&mp->mglist) &&
1267 (timer_pending(&mp->timer) ?
1268 time_after(mp->timer.expires, time) :
1269 try_to_del_timer_sync(&mp->timer) >= 0)) {
1270 mod_timer(&mp->timer, time);
1271
1272 mp->queries_sent = 0;
1273 mod_timer(&mp->query_timer, now);
1274 }
1275
1276 goto out;
1277 }
1278
1279 for (p = mp->ports; p; p = p->next) {
1280 if (p->port != port)
1281 continue;
1282
1283 if (!hlist_unhashed(&p->mglist) &&
1284 (timer_pending(&p->timer) ?
1285 time_after(p->timer.expires, time) :
1286 try_to_del_timer_sync(&p->timer) >= 0)) {
1287 mod_timer(&p->timer, time);
1288
1289 p->queries_sent = 0;
1290 mod_timer(&p->query_timer, now);
1291 }
1292
1293 break;
1294 }
1295
1296 out:
1297 spin_unlock(&br->multicast_lock);
1298 }
1299
1300 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1301 struct net_bridge_port *port,
1302 __be32 group)
1303 {
1304 struct br_ip br_group;
1305
1306 if (ipv4_is_local_multicast(group))
1307 return;
1308
1309 br_group.u.ip4 = group;
1310 br_group.proto = htons(ETH_P_IP);
1311
1312 br_multicast_leave_group(br, port, &br_group);
1313 }
1314
1315 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1316 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1317 struct net_bridge_port *port,
1318 const struct in6_addr *group)
1319 {
1320 struct br_ip br_group;
1321
1322 if (ipv6_is_local_multicast(group))
1323 return;
1324
1325 ipv6_addr_copy(&br_group.u.ip6, group);
1326 br_group.proto = htons(ETH_P_IPV6);
1327
1328 br_multicast_leave_group(br, port, &br_group);
1329 }
1330 #endif
1331
1332 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1333 struct net_bridge_port *port,
1334 struct sk_buff *skb)
1335 {
1336 struct sk_buff *skb2 = skb;
1337 struct iphdr *iph;
1338 struct igmphdr *ih;
1339 unsigned len;
1340 unsigned offset;
1341 int err;
1342
1343 /* We treat OOM as packet loss for now. */
1344 if (!pskb_may_pull(skb, sizeof(*iph)))
1345 return -EINVAL;
1346
1347 iph = ip_hdr(skb);
1348
1349 if (iph->ihl < 5 || iph->version != 4)
1350 return -EINVAL;
1351
1352 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1353 return -EINVAL;
1354
1355 iph = ip_hdr(skb);
1356
1357 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1358 return -EINVAL;
1359
1360 if (iph->protocol != IPPROTO_IGMP)
1361 return 0;
1362
1363 len = ntohs(iph->tot_len);
1364 if (skb->len < len || len < ip_hdrlen(skb))
1365 return -EINVAL;
1366
1367 if (skb->len > len) {
1368 skb2 = skb_clone(skb, GFP_ATOMIC);
1369 if (!skb2)
1370 return -ENOMEM;
1371
1372 err = pskb_trim_rcsum(skb2, len);
1373 if (err)
1374 goto err_out;
1375 }
1376
1377 len -= ip_hdrlen(skb2);
1378 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1379 __skb_pull(skb2, offset);
1380 skb_reset_transport_header(skb2);
1381
1382 err = -EINVAL;
1383 if (!pskb_may_pull(skb2, sizeof(*ih)))
1384 goto out;
1385
1386 switch (skb2->ip_summed) {
1387 case CHECKSUM_COMPLETE:
1388 if (!csum_fold(skb2->csum))
1389 break;
1390 /* fall through */
1391 case CHECKSUM_NONE:
1392 skb2->csum = 0;
1393 if (skb_checksum_complete(skb2))
1394 goto out;
1395 }
1396
1397 err = 0;
1398
1399 BR_INPUT_SKB_CB(skb)->igmp = 1;
1400 ih = igmp_hdr(skb2);
1401
1402 switch (ih->type) {
1403 case IGMP_HOST_MEMBERSHIP_REPORT:
1404 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1405 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1406 err = br_ip4_multicast_add_group(br, port, ih->group);
1407 break;
1408 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1409 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1410 break;
1411 case IGMP_HOST_MEMBERSHIP_QUERY:
1412 err = br_ip4_multicast_query(br, port, skb2);
1413 break;
1414 case IGMP_HOST_LEAVE_MESSAGE:
1415 br_ip4_multicast_leave_group(br, port, ih->group);
1416 break;
1417 }
1418
1419 out:
1420 __skb_push(skb2, offset);
1421 err_out:
1422 if (skb2 != skb)
1423 kfree_skb(skb2);
1424 return err;
1425 }
1426
1427 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1428 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1429 struct net_bridge_port *port,
1430 struct sk_buff *skb)
1431 {
1432 struct sk_buff *skb2 = skb;
1433 struct ipv6hdr *ip6h;
1434 struct icmp6hdr *icmp6h;
1435 u8 nexthdr;
1436 unsigned len;
1437 unsigned offset;
1438 int err;
1439
1440 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1441 return -EINVAL;
1442
1443 ip6h = ipv6_hdr(skb);
1444
1445 /*
1446 * We're interested in MLD messages only.
1447 * - Version is 6
1448 * - MLD has always Router Alert hop-by-hop option
1449 * - But we do not support jumbrograms.
1450 */
1451 if (ip6h->version != 6 ||
1452 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1453 ip6h->payload_len == 0)
1454 return 0;
1455
1456 len = ntohs(ip6h->payload_len);
1457 if (skb->len < len)
1458 return -EINVAL;
1459
1460 nexthdr = ip6h->nexthdr;
1461 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
1462
1463 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1464 return 0;
1465
1466 /* Okay, we found ICMPv6 header */
1467 skb2 = skb_clone(skb, GFP_ATOMIC);
1468 if (!skb2)
1469 return -ENOMEM;
1470
1471 len -= offset - skb_network_offset(skb2);
1472
1473 __skb_pull(skb2, offset);
1474 skb_reset_transport_header(skb2);
1475
1476 err = -EINVAL;
1477 if (!pskb_may_pull(skb2, sizeof(*icmp6h)))
1478 goto out;
1479
1480 icmp6h = icmp6_hdr(skb2);
1481
1482 switch (icmp6h->icmp6_type) {
1483 case ICMPV6_MGM_QUERY:
1484 case ICMPV6_MGM_REPORT:
1485 case ICMPV6_MGM_REDUCTION:
1486 case ICMPV6_MLD2_REPORT:
1487 break;
1488 default:
1489 err = 0;
1490 goto out;
1491 }
1492
1493 /* Okay, we found MLD message. Check further. */
1494 if (skb2->len > len) {
1495 err = pskb_trim_rcsum(skb2, len);
1496 if (err)
1497 goto out;
1498 }
1499
1500 switch (skb2->ip_summed) {
1501 case CHECKSUM_COMPLETE:
1502 if (!csum_fold(skb2->csum))
1503 break;
1504 /*FALLTHROUGH*/
1505 case CHECKSUM_NONE:
1506 skb2->csum = 0;
1507 if (skb_checksum_complete(skb2))
1508 goto out;
1509 }
1510
1511 err = 0;
1512
1513 BR_INPUT_SKB_CB(skb)->igmp = 1;
1514
1515 switch (icmp6h->icmp6_type) {
1516 case ICMPV6_MGM_REPORT:
1517 {
1518 struct mld_msg *mld = (struct mld_msg *)icmp6h;
1519 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1520 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1521 break;
1522 }
1523 case ICMPV6_MLD2_REPORT:
1524 err = br_ip6_multicast_mld2_report(br, port, skb2);
1525 break;
1526 case ICMPV6_MGM_QUERY:
1527 err = br_ip6_multicast_query(br, port, skb2);
1528 break;
1529 case ICMPV6_MGM_REDUCTION:
1530 {
1531 struct mld_msg *mld = (struct mld_msg *)icmp6h;
1532 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1533 }
1534 }
1535
1536 out:
1537 __skb_push(skb2, offset);
1538 if (skb2 != skb)
1539 kfree_skb(skb2);
1540 return err;
1541 }
1542 #endif
1543
1544 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1545 struct sk_buff *skb)
1546 {
1547 BR_INPUT_SKB_CB(skb)->igmp = 0;
1548 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1549
1550 if (br->multicast_disabled)
1551 return 0;
1552
1553 switch (skb->protocol) {
1554 case htons(ETH_P_IP):
1555 return br_multicast_ipv4_rcv(br, port, skb);
1556 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1557 case htons(ETH_P_IPV6):
1558 return br_multicast_ipv6_rcv(br, port, skb);
1559 #endif
1560 }
1561
1562 return 0;
1563 }
1564
1565 static void br_multicast_query_expired(unsigned long data)
1566 {
1567 struct net_bridge *br = (void *)data;
1568
1569 spin_lock(&br->multicast_lock);
1570 if (br->multicast_startup_queries_sent <
1571 br->multicast_startup_query_count)
1572 br->multicast_startup_queries_sent++;
1573
1574 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1575
1576 spin_unlock(&br->multicast_lock);
1577 }
1578
1579 void br_multicast_init(struct net_bridge *br)
1580 {
1581 br->hash_elasticity = 4;
1582 br->hash_max = 512;
1583
1584 br->multicast_router = 1;
1585 br->multicast_last_member_count = 2;
1586 br->multicast_startup_query_count = 2;
1587
1588 br->multicast_last_member_interval = HZ;
1589 br->multicast_query_response_interval = 10 * HZ;
1590 br->multicast_startup_query_interval = 125 * HZ / 4;
1591 br->multicast_query_interval = 125 * HZ;
1592 br->multicast_querier_interval = 255 * HZ;
1593 br->multicast_membership_interval = 260 * HZ;
1594
1595 spin_lock_init(&br->multicast_lock);
1596 setup_timer(&br->multicast_router_timer,
1597 br_multicast_local_router_expired, 0);
1598 setup_timer(&br->multicast_querier_timer,
1599 br_multicast_local_router_expired, 0);
1600 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1601 (unsigned long)br);
1602 }
1603
1604 void br_multicast_open(struct net_bridge *br)
1605 {
1606 br->multicast_startup_queries_sent = 0;
1607
1608 if (br->multicast_disabled)
1609 return;
1610
1611 mod_timer(&br->multicast_query_timer, jiffies);
1612 }
1613
1614 void br_multicast_stop(struct net_bridge *br)
1615 {
1616 struct net_bridge_mdb_htable *mdb;
1617 struct net_bridge_mdb_entry *mp;
1618 struct hlist_node *p, *n;
1619 u32 ver;
1620 int i;
1621
1622 del_timer_sync(&br->multicast_router_timer);
1623 del_timer_sync(&br->multicast_querier_timer);
1624 del_timer_sync(&br->multicast_query_timer);
1625
1626 spin_lock_bh(&br->multicast_lock);
1627 mdb = br->mdb;
1628 if (!mdb)
1629 goto out;
1630
1631 br->mdb = NULL;
1632
1633 ver = mdb->ver;
1634 for (i = 0; i < mdb->max; i++) {
1635 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1636 hlist[ver]) {
1637 del_timer(&mp->timer);
1638 del_timer(&mp->query_timer);
1639 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1640 }
1641 }
1642
1643 if (mdb->old) {
1644 spin_unlock_bh(&br->multicast_lock);
1645 rcu_barrier_bh();
1646 spin_lock_bh(&br->multicast_lock);
1647 WARN_ON(mdb->old);
1648 }
1649
1650 mdb->old = mdb;
1651 call_rcu_bh(&mdb->rcu, br_mdb_free);
1652
1653 out:
1654 spin_unlock_bh(&br->multicast_lock);
1655 }
1656
1657 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1658 {
1659 int err = -ENOENT;
1660
1661 spin_lock_bh(&br->multicast_lock);
1662 if (!netif_running(br->dev))
1663 goto unlock;
1664
1665 switch (val) {
1666 case 0:
1667 case 2:
1668 del_timer(&br->multicast_router_timer);
1669 /* fall through */
1670 case 1:
1671 br->multicast_router = val;
1672 err = 0;
1673 break;
1674
1675 default:
1676 err = -EINVAL;
1677 break;
1678 }
1679
1680 unlock:
1681 spin_unlock_bh(&br->multicast_lock);
1682
1683 return err;
1684 }
1685
1686 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1687 {
1688 struct net_bridge *br = p->br;
1689 int err = -ENOENT;
1690
1691 spin_lock(&br->multicast_lock);
1692 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1693 goto unlock;
1694
1695 switch (val) {
1696 case 0:
1697 case 1:
1698 case 2:
1699 p->multicast_router = val;
1700 err = 0;
1701
1702 if (val < 2 && !hlist_unhashed(&p->rlist))
1703 hlist_del_init_rcu(&p->rlist);
1704
1705 if (val == 1)
1706 break;
1707
1708 del_timer(&p->multicast_router_timer);
1709
1710 if (val == 0)
1711 break;
1712
1713 br_multicast_add_router(br, p);
1714 break;
1715
1716 default:
1717 err = -EINVAL;
1718 break;
1719 }
1720
1721 unlock:
1722 spin_unlock(&br->multicast_lock);
1723
1724 return err;
1725 }
1726
1727 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1728 {
1729 struct net_bridge_port *port;
1730 int err = -ENOENT;
1731
1732 spin_lock(&br->multicast_lock);
1733 if (!netif_running(br->dev))
1734 goto unlock;
1735
1736 err = 0;
1737 if (br->multicast_disabled == !val)
1738 goto unlock;
1739
1740 br->multicast_disabled = !val;
1741 if (br->multicast_disabled)
1742 goto unlock;
1743
1744 if (br->mdb) {
1745 if (br->mdb->old) {
1746 err = -EEXIST;
1747 rollback:
1748 br->multicast_disabled = !!val;
1749 goto unlock;
1750 }
1751
1752 err = br_mdb_rehash(&br->mdb, br->mdb->max,
1753 br->hash_elasticity);
1754 if (err)
1755 goto rollback;
1756 }
1757
1758 br_multicast_open(br);
1759 list_for_each_entry(port, &br->port_list, list) {
1760 if (port->state == BR_STATE_DISABLED ||
1761 port->state == BR_STATE_BLOCKING)
1762 continue;
1763
1764 __br_multicast_enable_port(port);
1765 }
1766
1767 unlock:
1768 spin_unlock(&br->multicast_lock);
1769
1770 return err;
1771 }
1772
1773 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1774 {
1775 int err = -ENOENT;
1776 u32 old;
1777
1778 spin_lock(&br->multicast_lock);
1779 if (!netif_running(br->dev))
1780 goto unlock;
1781
1782 err = -EINVAL;
1783 if (!is_power_of_2(val))
1784 goto unlock;
1785 if (br->mdb && val < br->mdb->size)
1786 goto unlock;
1787
1788 err = 0;
1789
1790 old = br->hash_max;
1791 br->hash_max = val;
1792
1793 if (br->mdb) {
1794 if (br->mdb->old) {
1795 err = -EEXIST;
1796 rollback:
1797 br->hash_max = old;
1798 goto unlock;
1799 }
1800
1801 err = br_mdb_rehash(&br->mdb, br->hash_max,
1802 br->hash_elasticity);
1803 if (err)
1804 goto rollback;
1805 }
1806
1807 unlock:
1808 spin_unlock(&br->multicast_lock);
1809
1810 return err;
1811 }
Linux kernel - Deliverables
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