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bridge: Allow mcast snooping for transient link local addresses too
[linux.git] / net / bridge / br_multicast.c
CommitLineData
eb1d1641
HX		 1/*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <[email protected]>
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>
b195167f 18#include <linux/log2.h>
eb1d1641
HX		 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>
08b202b6
YH		 27#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
28#include <net/ipv6.h>
29#include <net/mld.h>
30#include <net/addrconf.h>
d4c4f07d 31#include <net/ip6_checksum.h>
08b202b6 32#endif
eb1d1641
HX		 33
34#include "br_private.h"
35
e8051688
ED		 36#define mlock_dereference(X, br) \
37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
38
08b202b6 39#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
e4de9f9e 40static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
eb1d1641 41{
e4de9f9e 42 if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
08b202b6
YH		 43 return 1;
44 return 0;
45}
46#endif
47
8ef2a9a5
YH		 48static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
49{
50 if (a->proto != b->proto)
51 return 0;
52 switch (a->proto) {
53 case htons(ETH_P_IP):
54 return a->u.ip4 == b->u.ip4;
08b202b6
YH		 55#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
56 case htons(ETH_P_IPV6):
57 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
58#endif
8ef2a9a5
YH		 59 }
60 return 0;
61}
62
63static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
eb1d1641 64{
0eae88f3 65 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
eb1d1641
HX		 66}
67
08b202b6
YH		 68#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
69static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
70 const struct in6_addr *ip)
71{
72 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
73}
74#endif
75
8ef2a9a5
YH		 76static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
77 struct br_ip *ip)
78{
79 switch (ip->proto) {
80 case htons(ETH_P_IP):
81 return __br_ip4_hash(mdb, ip->u.ip4);
08b202b6
YH		 82#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
83 case htons(ETH_P_IPV6):
84 return __br_ip6_hash(mdb, &ip->u.ip6);
85#endif
8ef2a9a5
YH		 86 }
87 return 0;
eb1d1641
HX		 88}
89
90static struct net_bridge_mdb_entry *__br_mdb_ip_get(
8ef2a9a5 91 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
eb1d1641
HX		 92{
93 struct net_bridge_mdb_entry *mp;
94 struct hlist_node *p;
95
49f5fcfd 96 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
8ef2a9a5 97 if (br_ip_equal(&mp->addr, dst))
eb1d1641
HX		 98 return mp;
99 }
100
101 return NULL;
102}
103
7f285fa7
HX		 104static struct net_bridge_mdb_entry *br_mdb_ip_get(
105 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
106{
107 if (!mdb)
108 return NULL;
109
110 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
111}
112
8ef2a9a5 113static struct net_bridge_mdb_entry *br_mdb_ip4_get(
eb1d1641
HX		 114 struct net_bridge_mdb_htable *mdb, __be32 dst)
115{
8ef2a9a5
YH		 116 struct br_ip br_dst;
117
118 br_dst.u.ip4 = dst;
119 br_dst.proto = htons(ETH_P_IP);
0821ec55 120
7f285fa7 121 return br_mdb_ip_get(mdb, &br_dst);
8ef2a9a5
YH		 122}
123
08b202b6
YH		 124#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
125static struct net_bridge_mdb_entry *br_mdb_ip6_get(
126 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
127{
128 struct br_ip br_dst;
0821ec55 129
08b202b6
YH		 130 ipv6_addr_copy(&br_dst.u.ip6, dst);
131 br_dst.proto = htons(ETH_P_IPV6);
132
7f285fa7 133 return br_mdb_ip_get(mdb, &br_dst);
08b202b6
YH		 134}
135#endif
136
eb1d1641
HX		 137struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
138 struct sk_buff *skb)
139{
e8051688 140 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
8ef2a9a5
YH		 141 struct br_ip ip;
142
7f285fa7 143 if (br->multicast_disabled)
eb1d1641
HX		 144 return NULL;
145
8ef2a9a5 146 if (BR_INPUT_SKB_CB(skb)->igmp)
eb1d1641
HX		 147 return NULL;
148
8ef2a9a5
YH		 149 ip.proto = skb->protocol;
150
eb1d1641
HX		 151 switch (skb->protocol) {
152 case htons(ETH_P_IP):
8ef2a9a5
YH		 153 ip.u.ip4 = ip_hdr(skb)->daddr;
154 break;
08b202b6
YH		 155#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
156 case htons(ETH_P_IPV6):
157 ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr);
158 break;
159#endif
8ef2a9a5
YH		 160 default:
161 return NULL;
eb1d1641
HX		 162 }
163
8ef2a9a5 164 return br_mdb_ip_get(mdb, &ip);
eb1d1641
HX		 165}
166
167static void br_mdb_free(struct rcu_head *head)
168{
169 struct net_bridge_mdb_htable *mdb =
170 container_of(head, struct net_bridge_mdb_htable, rcu);
171 struct net_bridge_mdb_htable *old = mdb->old;
172
173 mdb->old = NULL;
174 kfree(old->mhash);
175 kfree(old);
176}
177
178static int br_mdb_copy(struct net_bridge_mdb_htable *new,
179 struct net_bridge_mdb_htable *old,
180 int elasticity)
181{
182 struct net_bridge_mdb_entry *mp;
183 struct hlist_node *p;
184 int maxlen;
185 int len;
186 int i;
187
188 for (i = 0; i < old->max; i++)
189 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
190 hlist_add_head(&mp->hlist[new->ver],
8ef2a9a5 191 &new->mhash[br_ip_hash(new, &mp->addr)]);
eb1d1641
HX		 192
193 if (!elasticity)
194 return 0;
195
196 maxlen = 0;
197 for (i = 0; i < new->max; i++) {
198 len = 0;
199 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
200 len++;
201 if (len > maxlen)
202 maxlen = len;
203 }
204
205 return maxlen > elasticity ? -EINVAL : 0;
206}
207
208static void br_multicast_free_pg(struct rcu_head *head)
209{
210 struct net_bridge_port_group *p =
211 container_of(head, struct net_bridge_port_group, rcu);
212
213 kfree(p);
214}
215
216static void br_multicast_free_group(struct rcu_head *head)
217{
218 struct net_bridge_mdb_entry *mp =
219 container_of(head, struct net_bridge_mdb_entry, rcu);
220
221 kfree(mp);
222}
223
224static void br_multicast_group_expired(unsigned long data)
225{
226 struct net_bridge_mdb_entry *mp = (void *)data;
227 struct net_bridge *br = mp->br;
228 struct net_bridge_mdb_htable *mdb;
229
230 spin_lock(&br->multicast_lock);
231 if (!netif_running(br->dev) || timer_pending(&mp->timer))
232 goto out;
233
8a870178 234 mp->mglist = false;
eb1d1641
HX		 235
236 if (mp->ports)
237 goto out;
238
e8051688
ED		 239 mdb = mlock_dereference(br->mdb, br);
240
eb1d1641
HX		 241 hlist_del_rcu(&mp->hlist[mdb->ver]);
242 mdb->size--;
243
244 del_timer(&mp->query_timer);
245 call_rcu_bh(&mp->rcu, br_multicast_free_group);
246
247out:
248 spin_unlock(&br->multicast_lock);
249}
250
251static void br_multicast_del_pg(struct net_bridge *br,
252 struct net_bridge_port_group *pg)
253{
e8051688 254 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 255 struct net_bridge_mdb_entry *mp;
256 struct net_bridge_port_group *p;
e8051688
ED		 257 struct net_bridge_port_group __rcu **pp;
258
259 mdb = mlock_dereference(br->mdb, br);
eb1d1641 260
8ef2a9a5 261 mp = br_mdb_ip_get(mdb, &pg->addr);
eb1d1641
HX		 262 if (WARN_ON(!mp))
263 return;
264
e8051688
ED		 265 for (pp = &mp->ports;
266 (p = mlock_dereference(*pp, br)) != NULL;
267 pp = &p->next) {
eb1d1641
HX		 268 if (p != pg)
269 continue;
270
83f6a740 271 rcu_assign_pointer(*pp, p->next);
eb1d1641
HX		 272 hlist_del_init(&p->mglist);
273 del_timer(&p->timer);
274 del_timer(&p->query_timer);
275 call_rcu_bh(&p->rcu, br_multicast_free_pg);
276
8a870178 277 if (!mp->ports && !mp->mglist &&
eb1d1641
HX		 278 netif_running(br->dev))
279 mod_timer(&mp->timer, jiffies);
280
281 return;
282 }
283
284 WARN_ON(1);
285}
286
287static void br_multicast_port_group_expired(unsigned long data)
288{
289 struct net_bridge_port_group *pg = (void *)data;
290 struct net_bridge *br = pg->port->br;
291
292 spin_lock(&br->multicast_lock);
293 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
294 hlist_unhashed(&pg->mglist))
295 goto out;
296
297 br_multicast_del_pg(br, pg);
298
299out:
300 spin_unlock(&br->multicast_lock);
301}
302
e8051688 303static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
eb1d1641
HX		 304 int elasticity)
305{
e8051688 306 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
eb1d1641
HX		 307 struct net_bridge_mdb_htable *mdb;
308 int err;
309
310 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
311 if (!mdb)
312 return -ENOMEM;
313
314 mdb->max = max;
315 mdb->old = old;
316
317 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
318 if (!mdb->mhash) {
319 kfree(mdb);
320 return -ENOMEM;
321 }
322
323 mdb->size = old ? old->size : 0;
324 mdb->ver = old ? old->ver ^ 1 : 0;
325
326 if (!old || elasticity)
327 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
328 else
329 mdb->secret = old->secret;
330
331 if (!old)
332 goto out;
333
334 err = br_mdb_copy(mdb, old, elasticity);
335 if (err) {
336 kfree(mdb->mhash);
337 kfree(mdb);
338 return err;
339 }
340
341 call_rcu_bh(&mdb->rcu, br_mdb_free);
342
343out:
344 rcu_assign_pointer(*mdbp, mdb);
345
346 return 0;
347}
348
8ef2a9a5
YH		 349static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
350 __be32 group)
eb1d1641
HX		 351{
352 struct sk_buff *skb;
353 struct igmphdr *ih;
354 struct ethhdr *eth;
355 struct iphdr *iph;
356
357 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
358 sizeof(*ih) + 4);
359 if (!skb)
360 goto out;
361
362 skb->protocol = htons(ETH_P_IP);
363
364 skb_reset_mac_header(skb);
365 eth = eth_hdr(skb);
366
367 memcpy(eth->h_source, br->dev->dev_addr, 6);
368 eth->h_dest[0] = 1;
369 eth->h_dest[1] = 0;
370 eth->h_dest[2] = 0x5e;
371 eth->h_dest[3] = 0;
372 eth->h_dest[4] = 0;
373 eth->h_dest[5] = 1;
374 eth->h_proto = htons(ETH_P_IP);
375 skb_put(skb, sizeof(*eth));
376
377 skb_set_network_header(skb, skb->len);
378 iph = ip_hdr(skb);
379
380 iph->version = 4;
381 iph->ihl = 6;
382 iph->tos = 0xc0;
383 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
384 iph->id = 0;
385 iph->frag_off = htons(IP_DF);
386 iph->ttl = 1;
387 iph->protocol = IPPROTO_IGMP;
388 iph->saddr = 0;
389 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
390 ((u8 *)&iph[1])[0] = IPOPT_RA;
391 ((u8 *)&iph[1])[1] = 4;
392 ((u8 *)&iph[1])[2] = 0;
393 ((u8 *)&iph[1])[3] = 0;
394 ip_send_check(iph);
395 skb_put(skb, 24);
396
397 skb_set_transport_header(skb, skb->len);
398 ih = igmp_hdr(skb);
399 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
400 ih->code = (group ? br->multicast_last_member_interval :
401 br->multicast_query_response_interval) /
402 (HZ / IGMP_TIMER_SCALE);
403 ih->group = group;
404 ih->csum = 0;
405 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
406 skb_put(skb, sizeof(*ih));
407
408 __skb_pull(skb, sizeof(*eth));
409
410out:
411 return skb;
412}
413
08b202b6
YH		 414#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
415static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
416 struct in6_addr *group)
417{
418 struct sk_buff *skb;
419 struct ipv6hdr *ip6h;
420 struct mld_msg *mldq;
421 struct ethhdr *eth;
422 u8 *hopopt;
423 unsigned long interval;
424
425 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
426 8 + sizeof(*mldq));
427 if (!skb)
428 goto out;
429
430 skb->protocol = htons(ETH_P_IPV6);
431
432 /* Ethernet header */
433 skb_reset_mac_header(skb);
434 eth = eth_hdr(skb);
435
436 memcpy(eth->h_source, br->dev->dev_addr, 6);
437 ipv6_eth_mc_map(group, eth->h_dest);
438 eth->h_proto = htons(ETH_P_IPV6);
439 skb_put(skb, sizeof(*eth));
440
441 /* IPv6 header + HbH option */
442 skb_set_network_header(skb, skb->len);
443 ip6h = ipv6_hdr(skb);
444
445 *(__force __be32 *)ip6h = htonl(0x60000000);
76d66158 446 ip6h->payload_len = htons(8 + sizeof(*mldq));
08b202b6
YH		 447 ip6h->nexthdr = IPPROTO_HOPOPTS;
448 ip6h->hop_limit = 1;
449 ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0);
450 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
451
452 hopopt = (u8 *)(ip6h + 1);
453 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
454 hopopt[1] = 0; /* length of HbH */
455 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
456 hopopt[3] = 2; /* Length of RA Option */
457 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
458 hopopt[5] = 0;
459 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */
460 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */
461
462 skb_put(skb, sizeof(*ip6h) + 8);
463
464 /* ICMPv6 */
465 skb_set_transport_header(skb, skb->len);
466 mldq = (struct mld_msg *) icmp6_hdr(skb);
467
468 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
469 br->multicast_query_response_interval;
470
471 mldq->mld_type = ICMPV6_MGM_QUERY;
472 mldq->mld_code = 0;
473 mldq->mld_cksum = 0;
474 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
475 mldq->mld_reserved = 0;
476 ipv6_addr_copy(&mldq->mld_mca, group);
477
478 /* checksum */
479 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
480 sizeof(*mldq), IPPROTO_ICMPV6,
481 csum_partial(mldq,
482 sizeof(*mldq), 0));
483 skb_put(skb, sizeof(*mldq));
484
485 __skb_pull(skb, sizeof(*eth));
486
487out:
488 return skb;
489}
490#endif
491
8ef2a9a5
YH		 492static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
493 struct br_ip *addr)
494{
495 switch (addr->proto) {
496 case htons(ETH_P_IP):
497 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
08b202b6
YH		 498#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
499 case htons(ETH_P_IPV6):
500 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
501#endif
8ef2a9a5
YH		 502 }
503 return NULL;
504}
505
eb1d1641
HX		 506static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
507{
508 struct net_bridge *br = mp->br;
509 struct sk_buff *skb;
510
8ef2a9a5 511 skb = br_multicast_alloc_query(br, &mp->addr);
eb1d1641
HX		 512 if (!skb)
513 goto timer;
514
515 netif_rx(skb);
516
517timer:
518 if (++mp->queries_sent < br->multicast_last_member_count)
519 mod_timer(&mp->query_timer,
520 jiffies + br->multicast_last_member_interval);
521}
522
523static void br_multicast_group_query_expired(unsigned long data)
524{
525 struct net_bridge_mdb_entry *mp = (void *)data;
526 struct net_bridge *br = mp->br;
527
528 spin_lock(&br->multicast_lock);
8a870178 529 if (!netif_running(br->dev) || !mp->mglist ||
eb1d1641
HX		 530 mp->queries_sent >= br->multicast_last_member_count)
531 goto out;
532
533 br_multicast_send_group_query(mp);
534
535out:
536 spin_unlock(&br->multicast_lock);
537}
538
539static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
540{
541 struct net_bridge_port *port = pg->port;
542 struct net_bridge *br = port->br;
543 struct sk_buff *skb;
544
8ef2a9a5 545 skb = br_multicast_alloc_query(br, &pg->addr);
eb1d1641
HX		 546 if (!skb)
547 goto timer;
548
549 br_deliver(port, skb);
550
551timer:
552 if (++pg->queries_sent < br->multicast_last_member_count)
553 mod_timer(&pg->query_timer,
554 jiffies + br->multicast_last_member_interval);
555}
556
557static void br_multicast_port_group_query_expired(unsigned long data)
558{
559 struct net_bridge_port_group *pg = (void *)data;
560 struct net_bridge_port *port = pg->port;
561 struct net_bridge *br = port->br;
562
563 spin_lock(&br->multicast_lock);
564 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
565 pg->queries_sent >= br->multicast_last_member_count)
566 goto out;
567
568 br_multicast_send_port_group_query(pg);
569
570out:
571 spin_unlock(&br->multicast_lock);
572}
573
574static struct net_bridge_mdb_entry *br_multicast_get_group(
8ef2a9a5
YH		 575 struct net_bridge *br, struct net_bridge_port *port,
576 struct br_ip *group, int hash)
eb1d1641 577{
e8051688 578 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 579 struct net_bridge_mdb_entry *mp;
580 struct hlist_node *p;
581 unsigned count = 0;
582 unsigned max;
583 int elasticity;
584 int err;
585
e8051688 586 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 587 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
588 count++;
8ef2a9a5 589 if (unlikely(br_ip_equal(group, &mp->addr)))
eb1d1641 590 return mp;
eb1d1641
HX		 591 }
592
593 elasticity = 0;
594 max = mdb->max;
595
596 if (unlikely(count > br->hash_elasticity && count)) {
597 if (net_ratelimit())
28a16c97 598 br_info(br, "Multicast hash table "
599 "chain limit reached: %s\n",
600 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 601
602 elasticity = br->hash_elasticity;
603 }
604
605 if (mdb->size >= max) {
606 max *= 2;
607 if (unlikely(max >= br->hash_max)) {
28a16c97 608 br_warn(br, "Multicast hash table maximum "
609 "reached, disabling snooping: %s, %d\n",
610 port ? port->dev->name : br->dev->name, max);
eb1d1641
HX		 611 err = -E2BIG;
612disable:
613 br->multicast_disabled = 1;
614 goto err;
615 }
616 }
617
618 if (max > mdb->max || elasticity) {
619 if (mdb->old) {
620 if (net_ratelimit())
28a16c97 621 br_info(br, "Multicast hash table "
622 "on fire: %s\n",
623 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 624 err = -EEXIST;
625 goto err;
626 }
627
628 err = br_mdb_rehash(&br->mdb, max, elasticity);
629 if (err) {
28a16c97 630 br_warn(br, "Cannot rehash multicast "
631 "hash table, disabling snooping: %s, %d, %d\n",
632 port ? port->dev->name : br->dev->name,
633 mdb->size, err);
eb1d1641
HX		 634 goto disable;
635 }
636
637 err = -EAGAIN;
638 goto err;
639 }
640
641 return NULL;
642
643err:
644 mp = ERR_PTR(err);
645 return mp;
646}
647
648static struct net_bridge_mdb_entry *br_multicast_new_group(
8ef2a9a5
YH		 649 struct net_bridge *br, struct net_bridge_port *port,
650 struct br_ip *group)
eb1d1641 651{
e8051688 652 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 653 struct net_bridge_mdb_entry *mp;
654 int hash;
4c0833bc 655 int err;
eb1d1641 656
e8051688 657 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641 658 if (!mdb) {
4c0833bc
TK		 659 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
660 if (err)
661 return ERR_PTR(err);
eb1d1641
HX		 662 goto rehash;
663 }
664
665 hash = br_ip_hash(mdb, group);
666 mp = br_multicast_get_group(br, port, group, hash);
667 switch (PTR_ERR(mp)) {
668 case 0:
669 break;
670
671 case -EAGAIN:
672rehash:
e8051688 673 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 674 hash = br_ip_hash(mdb, group);
675 break;
676
677 default:
678 goto out;
679 }
680
681 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
682 if (unlikely(!mp))
4c0833bc 683 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 684
685 mp->br = br;
8ef2a9a5 686 mp->addr = *group;
eb1d1641
HX		 687 setup_timer(&mp->timer, br_multicast_group_expired,
688 (unsigned long)mp);
689 setup_timer(&mp->query_timer, br_multicast_group_query_expired,
690 (unsigned long)mp);
691
692 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
693 mdb->size++;
694
695out:
696 return mp;
697}
698
699static int br_multicast_add_group(struct net_bridge *br,
8ef2a9a5
YH		 700 struct net_bridge_port *port,
701 struct br_ip *group)
eb1d1641
HX		 702{
703 struct net_bridge_mdb_entry *mp;
704 struct net_bridge_port_group *p;
e8051688 705 struct net_bridge_port_group __rcu **pp;
eb1d1641
HX		 706 unsigned long now = jiffies;
707 int err;
708
eb1d1641
HX		 709 spin_lock(&br->multicast_lock);
710 if (!netif_running(br->dev) ||
711 (port && port->state == BR_STATE_DISABLED))
712 goto out;
713
714 mp = br_multicast_new_group(br, port, group);
715 err = PTR_ERR(mp);
4c0833bc 716 if (IS_ERR(mp))
eb1d1641
HX		 717 goto err;
718
719 if (!port) {
8a870178 720 mp->mglist = true;
eb1d1641
HX		 721 mod_timer(&mp->timer, now + br->multicast_membership_interval);
722 goto out;
723 }
724
e8051688
ED		 725 for (pp = &mp->ports;
726 (p = mlock_dereference(*pp, br)) != NULL;
727 pp = &p->next) {
eb1d1641
HX		 728 if (p->port == port)
729 goto found;
730 if ((unsigned long)p->port < (unsigned long)port)
731 break;
732 }
733
734 p = kzalloc(sizeof(*p), GFP_ATOMIC);
735 err = -ENOMEM;
736 if (unlikely(!p))
737 goto err;
738
8ef2a9a5 739 p->addr = *group;
eb1d1641
HX		 740 p->port = port;
741 p->next = *pp;
742 hlist_add_head(&p->mglist, &port->mglist);
743 setup_timer(&p->timer, br_multicast_port_group_expired,
744 (unsigned long)p);
745 setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
746 (unsigned long)p);
747
748 rcu_assign_pointer(*pp, p);
749
750found:
751 mod_timer(&p->timer, now + br->multicast_membership_interval);
752out:
753 err = 0;
754
755err:
756 spin_unlock(&br->multicast_lock);
757 return err;
758}
759
8ef2a9a5
YH		 760static int br_ip4_multicast_add_group(struct net_bridge *br,
761 struct net_bridge_port *port,
762 __be32 group)
763{
764 struct br_ip br_group;
765
766 if (ipv4_is_local_multicast(group))
767 return 0;
768
769 br_group.u.ip4 = group;
770 br_group.proto = htons(ETH_P_IP);
771
772 return br_multicast_add_group(br, port, &br_group);
773}
774
08b202b6
YH		 775#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
776static int br_ip6_multicast_add_group(struct net_bridge *br,
777 struct net_bridge_port *port,
778 const struct in6_addr *group)
779{
780 struct br_ip br_group;
781
e4de9f9e 782 if (!ipv6_is_transient_multicast(group))
08b202b6
YH		 783 return 0;
784
785 ipv6_addr_copy(&br_group.u.ip6, group);
9cc6e0c4 786 br_group.proto = htons(ETH_P_IPV6);
08b202b6
YH		 787
788 return br_multicast_add_group(br, port, &br_group);
789}
790#endif
791
eb1d1641
HX		 792static void br_multicast_router_expired(unsigned long data)
793{
794 struct net_bridge_port *port = (void *)data;
795 struct net_bridge *br = port->br;
796
797 spin_lock(&br->multicast_lock);
798 if (port->multicast_router != 1 ||
799 timer_pending(&port->multicast_router_timer) ||
800 hlist_unhashed(&port->rlist))
801 goto out;
802
803 hlist_del_init_rcu(&port->rlist);
804
805out:
806 spin_unlock(&br->multicast_lock);
807}
808
809static void br_multicast_local_router_expired(unsigned long data)
810{
811}
812
8ef2a9a5
YH		 813static void __br_multicast_send_query(struct net_bridge *br,
814 struct net_bridge_port *port,
815 struct br_ip *ip)
eb1d1641 816{
eb1d1641
HX		 817 struct sk_buff *skb;
818
8ef2a9a5 819 skb = br_multicast_alloc_query(br, ip);
eb1d1641 820 if (!skb)
8ef2a9a5 821 return;
eb1d1641
HX		 822
823 if (port) {
824 __skb_push(skb, sizeof(struct ethhdr));
825 skb->dev = port->dev;
713aefa3 826 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
eb1d1641
HX		 827 dev_queue_xmit);
828 } else
829 netif_rx(skb);
8ef2a9a5
YH		 830}
831
832static void br_multicast_send_query(struct net_bridge *br,
833 struct net_bridge_port *port, u32 sent)
834{
835 unsigned long time;
836 struct br_ip br_group;
837
838 if (!netif_running(br->dev) || br->multicast_disabled ||
839 timer_pending(&br->multicast_querier_timer))
840 return;
841
08b202b6
YH		 842 memset(&br_group.u, 0, sizeof(br_group.u));
843
8ef2a9a5 844 br_group.proto = htons(ETH_P_IP);
08b202b6 845 __br_multicast_send_query(br, port, &br_group);
8ef2a9a5 846
08b202b6
YH		 847#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
848 br_group.proto = htons(ETH_P_IPV6);
8ef2a9a5 849 __br_multicast_send_query(br, port, &br_group);
08b202b6 850#endif
eb1d1641 851
eb1d1641
HX		 852 time = jiffies;
853 time += sent < br->multicast_startup_query_count ?
854 br->multicast_startup_query_interval :
855 br->multicast_query_interval;
856 mod_timer(port ? &port->multicast_query_timer :
857 &br->multicast_query_timer, time);
858}
859
860static void br_multicast_port_query_expired(unsigned long data)
861{
862 struct net_bridge_port *port = (void *)data;
863 struct net_bridge *br = port->br;
864
865 spin_lock(&br->multicast_lock);
02a780c0
DC		 866 if (port->state == BR_STATE_DISABLED ||
867 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 868 goto out;
869
870 if (port->multicast_startup_queries_sent <
871 br->multicast_startup_query_count)
872 port->multicast_startup_queries_sent++;
873
874 br_multicast_send_query(port->br, port,
875 port->multicast_startup_queries_sent);
876
877out:
878 spin_unlock(&br->multicast_lock);
879}
880
881void br_multicast_add_port(struct net_bridge_port *port)
882{
883 port->multicast_router = 1;
884
885 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
886 (unsigned long)port);
887 setup_timer(&port->multicast_query_timer,
888 br_multicast_port_query_expired, (unsigned long)port);
889}
890
891void br_multicast_del_port(struct net_bridge_port *port)
892{
893 del_timer_sync(&port->multicast_router_timer);
894}
895
561f1103
HX		 896static void __br_multicast_enable_port(struct net_bridge_port *port)
897{
898 port->multicast_startup_queries_sent = 0;
899
900 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
901 del_timer(&port->multicast_query_timer))
902 mod_timer(&port->multicast_query_timer, jiffies);
903}
904
eb1d1641
HX		 905void br_multicast_enable_port(struct net_bridge_port *port)
906{
907 struct net_bridge *br = port->br;
908
909 spin_lock(&br->multicast_lock);
910 if (br->multicast_disabled || !netif_running(br->dev))
911 goto out;
912
561f1103 913 __br_multicast_enable_port(port);
eb1d1641
HX		 914
915out:
916 spin_unlock(&br->multicast_lock);
917}
918
919void br_multicast_disable_port(struct net_bridge_port *port)
920{
921 struct net_bridge *br = port->br;
922 struct net_bridge_port_group *pg;
923 struct hlist_node *p, *n;
924
925 spin_lock(&br->multicast_lock);
926 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
927 br_multicast_del_pg(br, pg);
928
929 if (!hlist_unhashed(&port->rlist))
930 hlist_del_init_rcu(&port->rlist);
931 del_timer(&port->multicast_router_timer);
932 del_timer(&port->multicast_query_timer);
933 spin_unlock(&br->multicast_lock);
934}
935
8ef2a9a5
YH		 936static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
937 struct net_bridge_port *port,
938 struct sk_buff *skb)
eb1d1641
HX		 939{
940 struct igmpv3_report *ih;
941 struct igmpv3_grec *grec;
942 int i;
943 int len;
944 int num;
945 int type;
946 int err = 0;
947 __be32 group;
948
949 if (!pskb_may_pull(skb, sizeof(*ih)))
950 return -EINVAL;
951
952 ih = igmpv3_report_hdr(skb);
953 num = ntohs(ih->ngrec);
954 len = sizeof(*ih);
955
956 for (i = 0; i < num; i++) {
957 len += sizeof(*grec);
958 if (!pskb_may_pull(skb, len))
959 return -EINVAL;
960
fd218cf9 961 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 962 group = grec->grec_mca;
963 type = grec->grec_type;
964
8eabf95c 965 len += ntohs(grec->grec_nsrcs) * 4;
eb1d1641
HX		 966 if (!pskb_may_pull(skb, len))
967 return -EINVAL;
968
969 /* We treat this as an IGMPv2 report for now. */
970 switch (type) {
971 case IGMPV3_MODE_IS_INCLUDE:
972 case IGMPV3_MODE_IS_EXCLUDE:
973 case IGMPV3_CHANGE_TO_INCLUDE:
974 case IGMPV3_CHANGE_TO_EXCLUDE:
975 case IGMPV3_ALLOW_NEW_SOURCES:
976 case IGMPV3_BLOCK_OLD_SOURCES:
977 break;
978
979 default:
980 continue;
981 }
982
8ef2a9a5 983 err = br_ip4_multicast_add_group(br, port, group);
eb1d1641
HX		 984 if (err)
985 break;
986 }
987
988 return err;
989}
990
08b202b6
YH		 991#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
992static int br_ip6_multicast_mld2_report(struct net_bridge *br,
993 struct net_bridge_port *port,
994 struct sk_buff *skb)
995{
996 struct icmp6hdr *icmp6h;
997 struct mld2_grec *grec;
998 int i;
999 int len;
1000 int num;
1001 int err = 0;
1002
1003 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1004 return -EINVAL;
1005
1006 icmp6h = icmp6_hdr(skb);
1007 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1008 len = sizeof(*icmp6h);
1009
1010 for (i = 0; i < num; i++) {
1011 __be16 *nsrcs, _nsrcs;
1012
1013 nsrcs = skb_header_pointer(skb,
1014 len + offsetof(struct mld2_grec,
649e984d 1015 grec_nsrcs),
08b202b6
YH		 1016 sizeof(_nsrcs), &_nsrcs);
1017 if (!nsrcs)
1018 return -EINVAL;
1019
1020 if (!pskb_may_pull(skb,
1021 len + sizeof(*grec) +
d41db9f3 1022 sizeof(struct in6_addr) * ntohs(*nsrcs)))
08b202b6
YH		 1023 return -EINVAL;
1024
1025 grec = (struct mld2_grec *)(skb->data + len);
d41db9f3
LL		 1026 len += sizeof(*grec) +
1027 sizeof(struct in6_addr) * ntohs(*nsrcs);
08b202b6
YH		 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
7e80c124 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 */
0909e117
HX		 1057static void br_multicast_add_router(struct net_bridge *br,
1058 struct net_bridge_port *port)
1059{
dcdca2c4 1060 struct net_bridge_port *p;
7e80c124 1061 struct hlist_node *n, *slot = NULL;
dcdca2c4 1062
709b9326 1063 hlist_for_each_entry(p, n, &br->router_list, rlist) {
7e80c124 1064 if ((unsigned long) port >= (unsigned long) p)
1065 break;
1066 slot = n;
dcdca2c4 1067 }
1068
7e80c124 1069 if (slot)
1070 hlist_add_after_rcu(slot, &port->rlist);
dcdca2c4 1071 else
1072 hlist_add_head_rcu(&port->rlist, &br->router_list);
0909e117
HX		 1073}
1074
eb1d1641
HX		 1075static void br_multicast_mark_router(struct net_bridge *br,
1076 struct net_bridge_port *port)
1077{
1078 unsigned long now = jiffies;
eb1d1641
HX		 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
0909e117 1093 br_multicast_add_router(br, port);
eb1d1641
HX		 1094
1095timer:
1096 mod_timer(&port->multicast_router_timer,
1097 now + br->multicast_querier_interval);
1098}
1099
1100static void br_multicast_query_received(struct net_bridge *br,
1101 struct net_bridge_port *port,
8ef2a9a5 1102 int saddr)
eb1d1641
HX		 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
8ef2a9a5
YH		 1113static int br_ip4_multicast_query(struct net_bridge *br,
1114 struct net_bridge_port *port,
1115 struct sk_buff *skb)
eb1d1641
HX		 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;
e8051688 1122 struct net_bridge_port_group __rcu **pp;
eb1d1641
HX		 1123 unsigned long max_delay;
1124 unsigned long now = jiffies;
1125 __be32 group;
bec68ff1 1126 int err = 0;
eb1d1641
HX		 1127
1128 spin_lock(&br->multicast_lock);
1129 if (!netif_running(br->dev) ||
1130 (port && port->state == BR_STATE_DISABLED))
1131 goto out;
1132
8ef2a9a5 1133 br_multicast_query_received(br, port, !!iph->saddr);
eb1d1641
HX		 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 {
bec68ff1
YH		 1145 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1146 err = -EINVAL;
1147 goto out;
1148 }
eb1d1641
HX		 1149
1150 ih3 = igmpv3_query_hdr(skb);
1151 if (ih3->nsrcs)
bec68ff1 1152 goto out;
eb1d1641 1153
0ba8c9ec
YH		 1154 max_delay = ih3->code ?
1155 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
eb1d1641
HX		 1156 }
1157
1158 if (!group)
1159 goto out;
1160
e8051688 1161 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
eb1d1641
HX		 1162 if (!mp)
1163 goto out;
1164
1165 max_delay *= br->multicast_last_member_count;
1166
8a870178 1167 if (mp->mglist &&
eb1d1641
HX		 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
e8051688
ED		 1173 for (pp = &mp->ports;
1174 (p = mlock_dereference(*pp, br)) != NULL;
1175 pp = &p->next) {
eb1d1641
HX		 1176 if (timer_pending(&p->timer) ?
1177 time_after(p->timer.expires, now + max_delay) :
1178 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1179 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1180 }
1181
1182out:
1183 spin_unlock(&br->multicast_lock);
bec68ff1 1184 return err;
eb1d1641
HX		 1185}
1186
08b202b6
YH		 1187#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1188static 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;
e8051688
ED		 1196 struct net_bridge_port_group *p;
1197 struct net_bridge_port_group __rcu **pp;
08b202b6
YH		 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
e8051688 1233 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
08b202b6
YH		 1234 if (!mp)
1235 goto out;
1236
1237 max_delay *= br->multicast_last_member_count;
8a870178 1238 if (mp->mglist &&
08b202b6
YH		 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
e8051688
ED		 1244 for (pp = &mp->ports;
1245 (p = mlock_dereference(*pp, br)) != NULL;
1246 pp = &p->next) {
08b202b6
YH		 1247 if (timer_pending(&p->timer) ?
1248 time_after(p->timer.expires, now + max_delay) :
1249 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1250 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1251 }
1252
1253out:
1254 spin_unlock(&br->multicast_lock);
1255 return err;
1256}
1257#endif
1258
eb1d1641
HX		 1259static void br_multicast_leave_group(struct net_bridge *br,
1260 struct net_bridge_port *port,
8ef2a9a5 1261 struct br_ip *group)
eb1d1641
HX		 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
eb1d1641
HX		 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
e8051688 1275 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 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) {
8a870178 1285 if (mp->mglist &&
eb1d1641
HX		 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
e8051688
ED		 1298 for (p = mlock_dereference(mp->ports, br);
1299 p != NULL;
1300 p = mlock_dereference(p->next, br)) {
eb1d1641
HX		 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
1317out:
1318 spin_unlock(&br->multicast_lock);
1319}
1320
8ef2a9a5
YH		 1321static 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
08b202b6
YH		 1336#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1337static 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
e4de9f9e 1343 if (!ipv6_is_transient_multicast(group))
08b202b6
YH		 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
8ef2a9a5 1352
eb1d1641
HX		 1353static 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
eb1d1641
HX		 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)
8440853b 1395 goto err_out;
eb1d1641
HX		 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
eb1d1641
HX		 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))
8440853b 1415 goto out;
eb1d1641
HX		 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;
8ef2a9a5 1427 err = br_ip4_multicast_add_group(br, port, ih->group);
eb1d1641
HX		 1428 break;
1429 case IGMPV3_HOST_MEMBERSHIP_REPORT:
8ef2a9a5 1430 err = br_ip4_multicast_igmp3_report(br, port, skb2);
eb1d1641
HX		 1431 break;
1432 case IGMP_HOST_MEMBERSHIP_QUERY:
8ef2a9a5 1433 err = br_ip4_multicast_query(br, port, skb2);
eb1d1641
HX		 1434 break;
1435 case IGMP_HOST_LEAVE_MESSAGE:
8ef2a9a5 1436 br_ip4_multicast_leave_group(br, port, ih->group);
eb1d1641
HX		 1437 break;
1438 }
1439
1440out:
1441 __skb_push(skb2, offset);
8440853b 1442err_out:
eb1d1641
HX		 1443 if (skb2 != skb)
1444 kfree_skb(skb2);
1445 return err;
1446}
1447
08b202b6
YH		 1448#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1449static int br_multicast_ipv6_rcv(struct net_bridge *br,
1450 struct net_bridge_port *port,
1451 struct sk_buff *skb)
1452{
9d89081d 1453 struct sk_buff *skb2;
08b202b6
YH		 1454 struct ipv6hdr *ip6h;
1455 struct icmp6hdr *icmp6h;
1456 u8 nexthdr;
1457 unsigned len;
bb7a0bd6 1458 int offset;
08b202b6
YH		 1459 int err;
1460
08b202b6
YH		 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
9d89081d
TW		 1492 err = -EINVAL;
1493 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1494 goto out;
1495
08b202b6
YH		 1496 len -= offset - skb_network_offset(skb2);
1497
1498 __skb_pull(skb2, offset);
1499 skb_reset_transport_header(skb2);
1500
08b202b6
YH		 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 {
9d89081d
TW		 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);
08b202b6
YH		 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 {
9d89081d
TW		 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);
08b202b6
YH		 1563 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1564 }
1565 }
1566
1567out:
9d89081d 1568 kfree_skb(skb2);
08b202b6
YH		 1569 return err;
1570}
1571#endif
1572
eb1d1641
HX		 1573int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1574 struct sk_buff *skb)
1575{
1fafc7a9
YH		 1576 BR_INPUT_SKB_CB(skb)->igmp = 0;
1577 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1578
eb1d1641
HX		 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);
08b202b6
YH		 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
eb1d1641
HX		 1589 }
1590
1591 return 0;
1592}
1593
1594static 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
1608void 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
1633void 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
1643void 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);
e8051688 1656 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 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);
10cc2b50 1674 rcu_barrier_bh();
eb1d1641
HX		 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
1682out:
1683 spin_unlock_bh(&br->multicast_lock);
1684}
0909e117
HX		 1685
1686int 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
1709unlock:
1710 spin_unlock_bh(&br->multicast_lock);
1711
1712 return err;
1713}
1714
1715int 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
1750unlock:
1751 spin_unlock(&br->multicast_lock);
1752
1753 return err;
1754}
561f1103
HX		 1755
1756int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1757{
1758 struct net_bridge_port *port;
3a7fda06 1759 int err = 0;
e8051688 1760 struct net_bridge_mdb_htable *mdb;
561f1103
HX		 1761
1762 spin_lock(&br->multicast_lock);
561f1103
HX		 1763 if (br->multicast_disabled == !val)
1764 goto unlock;
1765
1766 br->multicast_disabled = !val;
1767 if (br->multicast_disabled)
1768 goto unlock;
1769
3a7fda06
HX		 1770 if (!netif_running(br->dev))
1771 goto unlock;
1772
e8051688
ED		 1773 mdb = mlock_dereference(br->mdb, br);
1774 if (mdb) {
1775 if (mdb->old) {
561f1103
HX		 1776 err = -EEXIST;
1777rollback:
1778 br->multicast_disabled = !!val;
1779 goto unlock;
1780 }
1781
e8051688 1782 err = br_mdb_rehash(&br->mdb, mdb->max,
561f1103
HX		 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
1797unlock:
1798 spin_unlock(&br->multicast_lock);
1799
1800 return err;
1801}
b195167f
HX		 1802
1803int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1804{
1805 int err = -ENOENT;
1806 u32 old;
e8051688 1807 struct net_bridge_mdb_htable *mdb;
b195167f
HX		 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;
e8051688
ED		 1816
1817 mdb = mlock_dereference(br->mdb, br);
1818 if (mdb && val < mdb->size)
b195167f
HX		 1819 goto unlock;
1820
1821 err = 0;
1822
1823 old = br->hash_max;
1824 br->hash_max = val;
1825
e8051688
ED		 1826 if (mdb) {
1827 if (mdb->old) {
b195167f
HX		 1828 err = -EEXIST;
1829rollback:
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
1840unlock:
1841 spin_unlock(&br->multicast_lock);
1842
1843 return err;
1844}
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