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[thirdparty/kernel/stable.git] / net / bridge / br_multicast.c
CommitLineData
eb1d1641
HX		 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>
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,
b71d1d42 416 const struct in6_addr *group)
08b202b6
YH		 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);
08b202b6
YH		 437 eth->h_proto = htons(ETH_P_IPV6);
438 skb_put(skb, sizeof(*eth));
439
440 /* IPv6 header + HbH option */
441 skb_set_network_header(skb, skb->len);
442 ip6h = ipv6_hdr(skb);
443
444 *(__force __be32 *)ip6h = htonl(0x60000000);
76d66158 445 ip6h->payload_len = htons(8 + sizeof(*mldq));
08b202b6
YH		 446 ip6h->nexthdr = IPPROTO_HOPOPTS;
447 ip6h->hop_limit = 1;
a7bff75b 448 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
fe29ec41
LL		 449 ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
450 &ip6h->saddr);
36cff5a1 451 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
08b202b6
YH		 452
453 hopopt = (u8 *)(ip6h + 1);
454 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
455 hopopt[1] = 0; /* length of HbH */
456 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
457 hopopt[3] = 2; /* Length of RA Option */
458 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
459 hopopt[5] = 0;
460 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */
461 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */
462
463 skb_put(skb, sizeof(*ip6h) + 8);
464
465 /* ICMPv6 */
466 skb_set_transport_header(skb, skb->len);
467 mldq = (struct mld_msg *) icmp6_hdr(skb);
468
469 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
470 br->multicast_query_response_interval;
471
472 mldq->mld_type = ICMPV6_MGM_QUERY;
473 mldq->mld_code = 0;
474 mldq->mld_cksum = 0;
475 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
476 mldq->mld_reserved = 0;
477 ipv6_addr_copy(&mldq->mld_mca, group);
478
479 /* checksum */
480 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
481 sizeof(*mldq), IPPROTO_ICMPV6,
482 csum_partial(mldq,
483 sizeof(*mldq), 0));
484 skb_put(skb, sizeof(*mldq));
485
486 __skb_pull(skb, sizeof(*eth));
487
488out:
489 return skb;
490}
491#endif
492
8ef2a9a5
YH		 493static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
494 struct br_ip *addr)
495{
496 switch (addr->proto) {
497 case htons(ETH_P_IP):
498 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
08b202b6
YH		 499#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
500 case htons(ETH_P_IPV6):
501 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
502#endif
8ef2a9a5
YH		 503 }
504 return NULL;
505}
506
eb1d1641
HX		 507static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
508{
509 struct net_bridge *br = mp->br;
510 struct sk_buff *skb;
511
8ef2a9a5 512 skb = br_multicast_alloc_query(br, &mp->addr);
eb1d1641
HX		 513 if (!skb)
514 goto timer;
515
516 netif_rx(skb);
517
518timer:
519 if (++mp->queries_sent < br->multicast_last_member_count)
520 mod_timer(&mp->query_timer,
521 jiffies + br->multicast_last_member_interval);
522}
523
524static void br_multicast_group_query_expired(unsigned long data)
525{
526 struct net_bridge_mdb_entry *mp = (void *)data;
527 struct net_bridge *br = mp->br;
528
529 spin_lock(&br->multicast_lock);
8a870178 530 if (!netif_running(br->dev) || !mp->mglist ||
eb1d1641
HX		 531 mp->queries_sent >= br->multicast_last_member_count)
532 goto out;
533
534 br_multicast_send_group_query(mp);
535
536out:
537 spin_unlock(&br->multicast_lock);
538}
539
540static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
541{
542 struct net_bridge_port *port = pg->port;
543 struct net_bridge *br = port->br;
544 struct sk_buff *skb;
545
8ef2a9a5 546 skb = br_multicast_alloc_query(br, &pg->addr);
eb1d1641
HX		 547 if (!skb)
548 goto timer;
549
550 br_deliver(port, skb);
551
552timer:
553 if (++pg->queries_sent < br->multicast_last_member_count)
554 mod_timer(&pg->query_timer,
555 jiffies + br->multicast_last_member_interval);
556}
557
558static void br_multicast_port_group_query_expired(unsigned long data)
559{
560 struct net_bridge_port_group *pg = (void *)data;
561 struct net_bridge_port *port = pg->port;
562 struct net_bridge *br = port->br;
563
564 spin_lock(&br->multicast_lock);
565 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
566 pg->queries_sent >= br->multicast_last_member_count)
567 goto out;
568
569 br_multicast_send_port_group_query(pg);
570
571out:
572 spin_unlock(&br->multicast_lock);
573}
574
575static struct net_bridge_mdb_entry *br_multicast_get_group(
8ef2a9a5
YH		 576 struct net_bridge *br, struct net_bridge_port *port,
577 struct br_ip *group, int hash)
eb1d1641 578{
e8051688 579 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 580 struct net_bridge_mdb_entry *mp;
581 struct hlist_node *p;
582 unsigned count = 0;
583 unsigned max;
584 int elasticity;
585 int err;
586
e8051688 587 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 588 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
589 count++;
8ef2a9a5 590 if (unlikely(br_ip_equal(group, &mp->addr)))
eb1d1641 591 return mp;
eb1d1641
HX		 592 }
593
594 elasticity = 0;
595 max = mdb->max;
596
597 if (unlikely(count > br->hash_elasticity && count)) {
598 if (net_ratelimit())
28a16c97 599 br_info(br, "Multicast hash table "
600 "chain limit reached: %s\n",
601 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 602
603 elasticity = br->hash_elasticity;
604 }
605
606 if (mdb->size >= max) {
607 max *= 2;
608 if (unlikely(max >= br->hash_max)) {
28a16c97 609 br_warn(br, "Multicast hash table maximum "
610 "reached, disabling snooping: %s, %d\n",
611 port ? port->dev->name : br->dev->name, max);
eb1d1641
HX		 612 err = -E2BIG;
613disable:
614 br->multicast_disabled = 1;
615 goto err;
616 }
617 }
618
619 if (max > mdb->max || elasticity) {
620 if (mdb->old) {
621 if (net_ratelimit())
28a16c97 622 br_info(br, "Multicast hash table "
623 "on fire: %s\n",
624 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 625 err = -EEXIST;
626 goto err;
627 }
628
629 err = br_mdb_rehash(&br->mdb, max, elasticity);
630 if (err) {
28a16c97 631 br_warn(br, "Cannot rehash multicast "
632 "hash table, disabling snooping: %s, %d, %d\n",
633 port ? port->dev->name : br->dev->name,
634 mdb->size, err);
eb1d1641
HX		 635 goto disable;
636 }
637
638 err = -EAGAIN;
639 goto err;
640 }
641
642 return NULL;
643
644err:
645 mp = ERR_PTR(err);
646 return mp;
647}
648
649static struct net_bridge_mdb_entry *br_multicast_new_group(
8ef2a9a5
YH		 650 struct net_bridge *br, struct net_bridge_port *port,
651 struct br_ip *group)
eb1d1641 652{
e8051688 653 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 654 struct net_bridge_mdb_entry *mp;
655 int hash;
4c0833bc 656 int err;
eb1d1641 657
e8051688 658 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641 659 if (!mdb) {
4c0833bc
TK		 660 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
661 if (err)
662 return ERR_PTR(err);
eb1d1641
HX		 663 goto rehash;
664 }
665
666 hash = br_ip_hash(mdb, group);
667 mp = br_multicast_get_group(br, port, group, hash);
668 switch (PTR_ERR(mp)) {
669 case 0:
670 break;
671
672 case -EAGAIN:
673rehash:
e8051688 674 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 675 hash = br_ip_hash(mdb, group);
676 break;
677
678 default:
679 goto out;
680 }
681
682 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
683 if (unlikely(!mp))
4c0833bc 684 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 685
686 mp->br = br;
8ef2a9a5 687 mp->addr = *group;
eb1d1641
HX		 688 setup_timer(&mp->timer, br_multicast_group_expired,
689 (unsigned long)mp);
690 setup_timer(&mp->query_timer, br_multicast_group_query_expired,
691 (unsigned long)mp);
692
693 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
694 mdb->size++;
695
696out:
697 return mp;
698}
699
700static int br_multicast_add_group(struct net_bridge *br,
8ef2a9a5
YH		 701 struct net_bridge_port *port,
702 struct br_ip *group)
eb1d1641
HX		 703{
704 struct net_bridge_mdb_entry *mp;
705 struct net_bridge_port_group *p;
e8051688 706 struct net_bridge_port_group __rcu **pp;
eb1d1641
HX		 707 unsigned long now = jiffies;
708 int err;
709
eb1d1641
HX		 710 spin_lock(&br->multicast_lock);
711 if (!netif_running(br->dev) ||
712 (port && port->state == BR_STATE_DISABLED))
713 goto out;
714
715 mp = br_multicast_new_group(br, port, group);
716 err = PTR_ERR(mp);
4c0833bc 717 if (IS_ERR(mp))
eb1d1641
HX		 718 goto err;
719
720 if (!port) {
8a870178 721 mp->mglist = true;
eb1d1641
HX		 722 mod_timer(&mp->timer, now + br->multicast_membership_interval);
723 goto out;
724 }
725
e8051688
ED		 726 for (pp = &mp->ports;
727 (p = mlock_dereference(*pp, br)) != NULL;
728 pp = &p->next) {
eb1d1641
HX		 729 if (p->port == port)
730 goto found;
731 if ((unsigned long)p->port < (unsigned long)port)
732 break;
733 }
734
735 p = kzalloc(sizeof(*p), GFP_ATOMIC);
736 err = -ENOMEM;
737 if (unlikely(!p))
738 goto err;
739
8ef2a9a5 740 p->addr = *group;
eb1d1641
HX		 741 p->port = port;
742 p->next = *pp;
743 hlist_add_head(&p->mglist, &port->mglist);
744 setup_timer(&p->timer, br_multicast_port_group_expired,
745 (unsigned long)p);
746 setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
747 (unsigned long)p);
748
749 rcu_assign_pointer(*pp, p);
750
751found:
752 mod_timer(&p->timer, now + br->multicast_membership_interval);
753out:
754 err = 0;
755
756err:
757 spin_unlock(&br->multicast_lock);
758 return err;
759}
760
8ef2a9a5
YH		 761static int br_ip4_multicast_add_group(struct net_bridge *br,
762 struct net_bridge_port *port,
763 __be32 group)
764{
765 struct br_ip br_group;
766
767 if (ipv4_is_local_multicast(group))
768 return 0;
769
770 br_group.u.ip4 = group;
771 br_group.proto = htons(ETH_P_IP);
772
773 return br_multicast_add_group(br, port, &br_group);
774}
775
08b202b6
YH		 776#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
777static int br_ip6_multicast_add_group(struct net_bridge *br,
778 struct net_bridge_port *port,
779 const struct in6_addr *group)
780{
781 struct br_ip br_group;
782
e4de9f9e 783 if (!ipv6_is_transient_multicast(group))
08b202b6
YH		 784 return 0;
785
786 ipv6_addr_copy(&br_group.u.ip6, group);
9cc6e0c4 787 br_group.proto = htons(ETH_P_IPV6);
08b202b6
YH		 788
789 return br_multicast_add_group(br, port, &br_group);
790}
791#endif
792
eb1d1641
HX		 793static void br_multicast_router_expired(unsigned long data)
794{
795 struct net_bridge_port *port = (void *)data;
796 struct net_bridge *br = port->br;
797
798 spin_lock(&br->multicast_lock);
799 if (port->multicast_router != 1 ||
800 timer_pending(&port->multicast_router_timer) ||
801 hlist_unhashed(&port->rlist))
802 goto out;
803
804 hlist_del_init_rcu(&port->rlist);
805
806out:
807 spin_unlock(&br->multicast_lock);
808}
809
810static void br_multicast_local_router_expired(unsigned long data)
811{
812}
813
8ef2a9a5
YH		 814static void __br_multicast_send_query(struct net_bridge *br,
815 struct net_bridge_port *port,
816 struct br_ip *ip)
eb1d1641 817{
eb1d1641
HX		 818 struct sk_buff *skb;
819
8ef2a9a5 820 skb = br_multicast_alloc_query(br, ip);
eb1d1641 821 if (!skb)
8ef2a9a5 822 return;
eb1d1641
HX		 823
824 if (port) {
825 __skb_push(skb, sizeof(struct ethhdr));
826 skb->dev = port->dev;
713aefa3 827 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
eb1d1641
HX		 828 dev_queue_xmit);
829 } else
830 netif_rx(skb);
8ef2a9a5
YH		 831}
832
833static void br_multicast_send_query(struct net_bridge *br,
834 struct net_bridge_port *port, u32 sent)
835{
836 unsigned long time;
837 struct br_ip br_group;
838
839 if (!netif_running(br->dev) || br->multicast_disabled ||
840 timer_pending(&br->multicast_querier_timer))
841 return;
842
08b202b6
YH		 843 memset(&br_group.u, 0, sizeof(br_group.u));
844
8ef2a9a5 845 br_group.proto = htons(ETH_P_IP);
08b202b6 846 __br_multicast_send_query(br, port, &br_group);
8ef2a9a5 847
08b202b6
YH		 848#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
849 br_group.proto = htons(ETH_P_IPV6);
8ef2a9a5 850 __br_multicast_send_query(br, port, &br_group);
08b202b6 851#endif
eb1d1641 852
eb1d1641
HX		 853 time = jiffies;
854 time += sent < br->multicast_startup_query_count ?
855 br->multicast_startup_query_interval :
856 br->multicast_query_interval;
857 mod_timer(port ? &port->multicast_query_timer :
858 &br->multicast_query_timer, time);
859}
860
861static void br_multicast_port_query_expired(unsigned long data)
862{
863 struct net_bridge_port *port = (void *)data;
864 struct net_bridge *br = port->br;
865
866 spin_lock(&br->multicast_lock);
02a780c0
DC		 867 if (port->state == BR_STATE_DISABLED ||
868 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 869 goto out;
870
871 if (port->multicast_startup_queries_sent <
872 br->multicast_startup_query_count)
873 port->multicast_startup_queries_sent++;
874
875 br_multicast_send_query(port->br, port,
876 port->multicast_startup_queries_sent);
877
878out:
879 spin_unlock(&br->multicast_lock);
880}
881
882void br_multicast_add_port(struct net_bridge_port *port)
883{
884 port->multicast_router = 1;
885
886 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
887 (unsigned long)port);
888 setup_timer(&port->multicast_query_timer,
889 br_multicast_port_query_expired, (unsigned long)port);
890}
891
892void br_multicast_del_port(struct net_bridge_port *port)
893{
894 del_timer_sync(&port->multicast_router_timer);
895}
896
561f1103
HX		 897static void __br_multicast_enable_port(struct net_bridge_port *port)
898{
899 port->multicast_startup_queries_sent = 0;
900
901 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
902 del_timer(&port->multicast_query_timer))
903 mod_timer(&port->multicast_query_timer, jiffies);
904}
905
eb1d1641
HX		 906void br_multicast_enable_port(struct net_bridge_port *port)
907{
908 struct net_bridge *br = port->br;
909
910 spin_lock(&br->multicast_lock);
911 if (br->multicast_disabled || !netif_running(br->dev))
912 goto out;
913
561f1103 914 __br_multicast_enable_port(port);
eb1d1641
HX		 915
916out:
917 spin_unlock(&br->multicast_lock);
918}
919
920void br_multicast_disable_port(struct net_bridge_port *port)
921{
922 struct net_bridge *br = port->br;
923 struct net_bridge_port_group *pg;
924 struct hlist_node *p, *n;
925
926 spin_lock(&br->multicast_lock);
927 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
928 br_multicast_del_pg(br, pg);
929
930 if (!hlist_unhashed(&port->rlist))
931 hlist_del_init_rcu(&port->rlist);
932 del_timer(&port->multicast_router_timer);
933 del_timer(&port->multicast_query_timer);
934 spin_unlock(&br->multicast_lock);
935}
936
8ef2a9a5
YH		 937static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
938 struct net_bridge_port *port,
939 struct sk_buff *skb)
eb1d1641
HX		 940{
941 struct igmpv3_report *ih;
942 struct igmpv3_grec *grec;
943 int i;
944 int len;
945 int num;
946 int type;
947 int err = 0;
948 __be32 group;
949
950 if (!pskb_may_pull(skb, sizeof(*ih)))
951 return -EINVAL;
952
953 ih = igmpv3_report_hdr(skb);
954 num = ntohs(ih->ngrec);
955 len = sizeof(*ih);
956
957 for (i = 0; i < num; i++) {
958 len += sizeof(*grec);
959 if (!pskb_may_pull(skb, len))
960 return -EINVAL;
961
fd218cf9 962 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 963 group = grec->grec_mca;
964 type = grec->grec_type;
965
8eabf95c 966 len += ntohs(grec->grec_nsrcs) * 4;
eb1d1641
HX		 967 if (!pskb_may_pull(skb, len))
968 return -EINVAL;
969
970 /* We treat this as an IGMPv2 report for now. */
971 switch (type) {
972 case IGMPV3_MODE_IS_INCLUDE:
973 case IGMPV3_MODE_IS_EXCLUDE:
974 case IGMPV3_CHANGE_TO_INCLUDE:
975 case IGMPV3_CHANGE_TO_EXCLUDE:
976 case IGMPV3_ALLOW_NEW_SOURCES:
977 case IGMPV3_BLOCK_OLD_SOURCES:
978 break;
979
980 default:
981 continue;
982 }
983
8ef2a9a5 984 err = br_ip4_multicast_add_group(br, port, group);
eb1d1641
HX		 985 if (err)
986 break;
987 }
988
989 return err;
990}
991
08b202b6
YH		 992#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
993static int br_ip6_multicast_mld2_report(struct net_bridge *br,
994 struct net_bridge_port *port,
995 struct sk_buff *skb)
996{
997 struct icmp6hdr *icmp6h;
998 struct mld2_grec *grec;
999 int i;
1000 int len;
1001 int num;
1002 int err = 0;
1003
1004 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1005 return -EINVAL;
1006
1007 icmp6h = icmp6_hdr(skb);
1008 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1009 len = sizeof(*icmp6h);
1010
1011 for (i = 0; i < num; i++) {
1012 __be16 *nsrcs, _nsrcs;
1013
1014 nsrcs = skb_header_pointer(skb,
1015 len + offsetof(struct mld2_grec,
649e984d 1016 grec_nsrcs),
08b202b6
YH		 1017 sizeof(_nsrcs), &_nsrcs);
1018 if (!nsrcs)
1019 return -EINVAL;
1020
1021 if (!pskb_may_pull(skb,
1022 len + sizeof(*grec) +
d41db9f3 1023 sizeof(struct in6_addr) * ntohs(*nsrcs)))
08b202b6
YH		 1024 return -EINVAL;
1025
1026 grec = (struct mld2_grec *)(skb->data + len);
d41db9f3
LL		 1027 len += sizeof(*grec) +
1028 sizeof(struct in6_addr) * ntohs(*nsrcs);
08b202b6
YH		 1029
1030 /* We treat these as MLDv1 reports for now. */
1031 switch (grec->grec_type) {
1032 case MLD2_MODE_IS_INCLUDE:
1033 case MLD2_MODE_IS_EXCLUDE:
1034 case MLD2_CHANGE_TO_INCLUDE:
1035 case MLD2_CHANGE_TO_EXCLUDE:
1036 case MLD2_ALLOW_NEW_SOURCES:
1037 case MLD2_BLOCK_OLD_SOURCES:
1038 break;
1039
1040 default:
1041 continue;
1042 }
1043
1044 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
1045 if (!err)
1046 break;
1047 }
1048
1049 return err;
1050}
1051#endif
1052
7e80c124 1053/*
1054 * Add port to rotuer_list
1055 * list is maintained ordered by pointer value
1056 * and locked by br->multicast_lock and RCU
1057 */
0909e117
HX		 1058static void br_multicast_add_router(struct net_bridge *br,
1059 struct net_bridge_port *port)
1060{
dcdca2c4 1061 struct net_bridge_port *p;
7e80c124 1062 struct hlist_node *n, *slot = NULL;
dcdca2c4 1063
709b9326 1064 hlist_for_each_entry(p, n, &br->router_list, rlist) {
7e80c124 1065 if ((unsigned long) port >= (unsigned long) p)
1066 break;
1067 slot = n;
dcdca2c4 1068 }
1069
7e80c124 1070 if (slot)
1071 hlist_add_after_rcu(slot, &port->rlist);
dcdca2c4 1072 else
1073 hlist_add_head_rcu(&port->rlist, &br->router_list);
0909e117
HX		 1074}
1075
eb1d1641
HX		 1076static void br_multicast_mark_router(struct net_bridge *br,
1077 struct net_bridge_port *port)
1078{
1079 unsigned long now = jiffies;
eb1d1641
HX		 1080
1081 if (!port) {
1082 if (br->multicast_router == 1)
1083 mod_timer(&br->multicast_router_timer,
1084 now + br->multicast_querier_interval);
1085 return;
1086 }
1087
1088 if (port->multicast_router != 1)
1089 return;
1090
1091 if (!hlist_unhashed(&port->rlist))
1092 goto timer;
1093
0909e117 1094 br_multicast_add_router(br, port);
eb1d1641
HX		 1095
1096timer:
1097 mod_timer(&port->multicast_router_timer,
1098 now + br->multicast_querier_interval);
1099}
1100
1101static void br_multicast_query_received(struct net_bridge *br,
1102 struct net_bridge_port *port,
8ef2a9a5 1103 int saddr)
eb1d1641
HX		 1104{
1105 if (saddr)
1106 mod_timer(&br->multicast_querier_timer,
1107 jiffies + br->multicast_querier_interval);
1108 else if (timer_pending(&br->multicast_querier_timer))
1109 return;
1110
1111 br_multicast_mark_router(br, port);
1112}
1113
8ef2a9a5
YH		 1114static int br_ip4_multicast_query(struct net_bridge *br,
1115 struct net_bridge_port *port,
1116 struct sk_buff *skb)
eb1d1641 1117{
b71d1d42 1118 const struct iphdr *iph = ip_hdr(skb);
eb1d1641
HX		 1119 struct igmphdr *ih = igmp_hdr(skb);
1120 struct net_bridge_mdb_entry *mp;
1121 struct igmpv3_query *ih3;
1122 struct net_bridge_port_group *p;
e8051688 1123 struct net_bridge_port_group __rcu **pp;
eb1d1641
HX		 1124 unsigned long max_delay;
1125 unsigned long now = jiffies;
1126 __be32 group;
bec68ff1 1127 int err = 0;
eb1d1641
HX		 1128
1129 spin_lock(&br->multicast_lock);
1130 if (!netif_running(br->dev) ||
1131 (port && port->state == BR_STATE_DISABLED))
1132 goto out;
1133
8ef2a9a5 1134 br_multicast_query_received(br, port, !!iph->saddr);
eb1d1641
HX		 1135
1136 group = ih->group;
1137
1138 if (skb->len == sizeof(*ih)) {
1139 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1140
1141 if (!max_delay) {
1142 max_delay = 10 * HZ;
1143 group = 0;
1144 }
1145 } else {
bec68ff1
YH		 1146 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1147 err = -EINVAL;
1148 goto out;
1149 }
eb1d1641
HX		 1150
1151 ih3 = igmpv3_query_hdr(skb);
1152 if (ih3->nsrcs)
bec68ff1 1153 goto out;
eb1d1641 1154
0ba8c9ec
YH		 1155 max_delay = ih3->code ?
1156 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
eb1d1641
HX		 1157 }
1158
1159 if (!group)
1160 goto out;
1161
e8051688 1162 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
eb1d1641
HX		 1163 if (!mp)
1164 goto out;
1165
1166 max_delay *= br->multicast_last_member_count;
1167
8a870178 1168 if (mp->mglist &&
eb1d1641
HX		 1169 (timer_pending(&mp->timer) ?
1170 time_after(mp->timer.expires, now + max_delay) :
1171 try_to_del_timer_sync(&mp->timer) >= 0))
1172 mod_timer(&mp->timer, now + max_delay);
1173
e8051688
ED		 1174 for (pp = &mp->ports;
1175 (p = mlock_dereference(*pp, br)) != NULL;
1176 pp = &p->next) {
eb1d1641
HX		 1177 if (timer_pending(&p->timer) ?
1178 time_after(p->timer.expires, now + max_delay) :
1179 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1180 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1181 }
1182
1183out:
1184 spin_unlock(&br->multicast_lock);
bec68ff1 1185 return err;
eb1d1641
HX		 1186}
1187
08b202b6
YH		 1188#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1189static int br_ip6_multicast_query(struct net_bridge *br,
1190 struct net_bridge_port *port,
1191 struct sk_buff *skb)
1192{
b71d1d42 1193 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
08b202b6
YH		 1194 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1195 struct net_bridge_mdb_entry *mp;
1196 struct mld2_query *mld2q;
e8051688
ED		 1197 struct net_bridge_port_group *p;
1198 struct net_bridge_port_group __rcu **pp;
08b202b6
YH		 1199 unsigned long max_delay;
1200 unsigned long now = jiffies;
b71d1d42 1201 const struct in6_addr *group = NULL;
08b202b6
YH		 1202 int err = 0;
1203
1204 spin_lock(&br->multicast_lock);
1205 if (!netif_running(br->dev) ||
1206 (port && port->state == BR_STATE_DISABLED))
1207 goto out;
1208
1209 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1210
1211 if (skb->len == sizeof(*mld)) {
1212 if (!pskb_may_pull(skb, sizeof(*mld))) {
1213 err = -EINVAL;
1214 goto out;
1215 }
1216 mld = (struct mld_msg *) icmp6_hdr(skb);
1217 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
1218 if (max_delay)
1219 group = &mld->mld_mca;
1220 } else if (skb->len >= sizeof(*mld2q)) {
1221 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1222 err = -EINVAL;
1223 goto out;
1224 }
1225 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1226 if (!mld2q->mld2q_nsrcs)
1227 group = &mld2q->mld2q_mca;
1228 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1229 }
1230
1231 if (!group)
1232 goto out;
1233
e8051688 1234 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
08b202b6
YH		 1235 if (!mp)
1236 goto out;
1237
1238 max_delay *= br->multicast_last_member_count;
8a870178 1239 if (mp->mglist &&
08b202b6
YH		 1240 (timer_pending(&mp->timer) ?
1241 time_after(mp->timer.expires, now + max_delay) :
1242 try_to_del_timer_sync(&mp->timer) >= 0))
1243 mod_timer(&mp->timer, now + max_delay);
1244
e8051688
ED		 1245 for (pp = &mp->ports;
1246 (p = mlock_dereference(*pp, br)) != NULL;
1247 pp = &p->next) {
08b202b6
YH		 1248 if (timer_pending(&p->timer) ?
1249 time_after(p->timer.expires, now + max_delay) :
1250 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1251 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1252 }
1253
1254out:
1255 spin_unlock(&br->multicast_lock);
1256 return err;
1257}
1258#endif
1259
eb1d1641
HX		 1260static void br_multicast_leave_group(struct net_bridge *br,
1261 struct net_bridge_port *port,
8ef2a9a5 1262 struct br_ip *group)
eb1d1641
HX		 1263{
1264 struct net_bridge_mdb_htable *mdb;
1265 struct net_bridge_mdb_entry *mp;
1266 struct net_bridge_port_group *p;
1267 unsigned long now;
1268 unsigned long time;
1269
eb1d1641
HX		 1270 spin_lock(&br->multicast_lock);
1271 if (!netif_running(br->dev) ||
1272 (port && port->state == BR_STATE_DISABLED) ||
1273 timer_pending(&br->multicast_querier_timer))
1274 goto out;
1275
e8051688 1276 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1277 mp = br_mdb_ip_get(mdb, group);
1278 if (!mp)
1279 goto out;
1280
1281 now = jiffies;
1282 time = now + br->multicast_last_member_count *
1283 br->multicast_last_member_interval;
1284
1285 if (!port) {
8a870178 1286 if (mp->mglist &&
eb1d1641
HX		 1287 (timer_pending(&mp->timer) ?
1288 time_after(mp->timer.expires, time) :
1289 try_to_del_timer_sync(&mp->timer) >= 0)) {
1290 mod_timer(&mp->timer, time);
1291
1292 mp->queries_sent = 0;
1293 mod_timer(&mp->query_timer, now);
1294 }
1295
1296 goto out;
1297 }
1298
e8051688
ED		 1299 for (p = mlock_dereference(mp->ports, br);
1300 p != NULL;
1301 p = mlock_dereference(p->next, br)) {
eb1d1641
HX		 1302 if (p->port != port)
1303 continue;
1304
1305 if (!hlist_unhashed(&p->mglist) &&
1306 (timer_pending(&p->timer) ?
1307 time_after(p->timer.expires, time) :
1308 try_to_del_timer_sync(&p->timer) >= 0)) {
1309 mod_timer(&p->timer, time);
1310
1311 p->queries_sent = 0;
1312 mod_timer(&p->query_timer, now);
1313 }
1314
1315 break;
1316 }
1317
1318out:
1319 spin_unlock(&br->multicast_lock);
1320}
1321
8ef2a9a5
YH		 1322static void br_ip4_multicast_leave_group(struct net_bridge *br,
1323 struct net_bridge_port *port,
1324 __be32 group)
1325{
1326 struct br_ip br_group;
1327
1328 if (ipv4_is_local_multicast(group))
1329 return;
1330
1331 br_group.u.ip4 = group;
1332 br_group.proto = htons(ETH_P_IP);
1333
1334 br_multicast_leave_group(br, port, &br_group);
1335}
1336
08b202b6
YH		 1337#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1338static void br_ip6_multicast_leave_group(struct net_bridge *br,
1339 struct net_bridge_port *port,
1340 const struct in6_addr *group)
1341{
1342 struct br_ip br_group;
1343
e4de9f9e 1344 if (!ipv6_is_transient_multicast(group))
08b202b6
YH		 1345 return;
1346
1347 ipv6_addr_copy(&br_group.u.ip6, group);
1348 br_group.proto = htons(ETH_P_IPV6);
1349
1350 br_multicast_leave_group(br, port, &br_group);
1351}
1352#endif
8ef2a9a5 1353
eb1d1641
HX		 1354static int br_multicast_ipv4_rcv(struct net_bridge *br,
1355 struct net_bridge_port *port,
1356 struct sk_buff *skb)
1357{
1358 struct sk_buff *skb2 = skb;
b71d1d42 1359 const struct iphdr *iph;
eb1d1641
HX		 1360 struct igmphdr *ih;
1361 unsigned len;
1362 unsigned offset;
1363 int err;
1364
eb1d1641
HX		 1365 /* We treat OOM as packet loss for now. */
1366 if (!pskb_may_pull(skb, sizeof(*iph)))
1367 return -EINVAL;
1368
1369 iph = ip_hdr(skb);
1370
1371 if (iph->ihl < 5 || iph->version != 4)
1372 return -EINVAL;
1373
1374 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1375 return -EINVAL;
1376
1377 iph = ip_hdr(skb);
1378
1379 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1380 return -EINVAL;
1381
1382 if (iph->protocol != IPPROTO_IGMP)
1383 return 0;
1384
1385 len = ntohs(iph->tot_len);
1386 if (skb->len < len || len < ip_hdrlen(skb))
1387 return -EINVAL;
1388
1389 if (skb->len > len) {
1390 skb2 = skb_clone(skb, GFP_ATOMIC);
1391 if (!skb2)
1392 return -ENOMEM;
1393
1394 err = pskb_trim_rcsum(skb2, len);
1395 if (err)
8440853b 1396 goto err_out;
eb1d1641
HX		 1397 }
1398
1399 len -= ip_hdrlen(skb2);
1400 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1401 __skb_pull(skb2, offset);
1402 skb_reset_transport_header(skb2);
1403
1404 err = -EINVAL;
1405 if (!pskb_may_pull(skb2, sizeof(*ih)))
1406 goto out;
1407
eb1d1641
HX		 1408 switch (skb2->ip_summed) {
1409 case CHECKSUM_COMPLETE:
1410 if (!csum_fold(skb2->csum))
1411 break;
1412 /* fall through */
1413 case CHECKSUM_NONE:
1414 skb2->csum = 0;
1415 if (skb_checksum_complete(skb2))
8440853b 1416 goto out;
eb1d1641
HX		 1417 }
1418
1419 err = 0;
1420
1421 BR_INPUT_SKB_CB(skb)->igmp = 1;
1422 ih = igmp_hdr(skb2);
1423
1424 switch (ih->type) {
1425 case IGMP_HOST_MEMBERSHIP_REPORT:
1426 case IGMPV2_HOST_MEMBERSHIP_REPORT:
62b2bcb4 1427 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
8ef2a9a5 1428 err = br_ip4_multicast_add_group(br, port, ih->group);
eb1d1641
HX		 1429 break;
1430 case IGMPV3_HOST_MEMBERSHIP_REPORT:
8ef2a9a5 1431 err = br_ip4_multicast_igmp3_report(br, port, skb2);
eb1d1641
HX		 1432 break;
1433 case IGMP_HOST_MEMBERSHIP_QUERY:
8ef2a9a5 1434 err = br_ip4_multicast_query(br, port, skb2);
eb1d1641
HX		 1435 break;
1436 case IGMP_HOST_LEAVE_MESSAGE:
8ef2a9a5 1437 br_ip4_multicast_leave_group(br, port, ih->group);
eb1d1641
HX		 1438 break;
1439 }
1440
1441out:
1442 __skb_push(skb2, offset);
8440853b 1443err_out:
eb1d1641
HX		 1444 if (skb2 != skb)
1445 kfree_skb(skb2);
1446 return err;
1447}
1448
08b202b6
YH		 1449#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1450static int br_multicast_ipv6_rcv(struct net_bridge *br,
1451 struct net_bridge_port *port,
1452 struct sk_buff *skb)
1453{
9d89081d 1454 struct sk_buff *skb2;
b71d1d42 1455 const struct ipv6hdr *ip6h;
08b202b6
YH		 1456 struct icmp6hdr *icmp6h;
1457 u8 nexthdr;
1458 unsigned len;
bb7a0bd6 1459 int offset;
08b202b6
YH		 1460 int err;
1461
08b202b6
YH		 1462 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1463 return -EINVAL;
1464
1465 ip6h = ipv6_hdr(skb);
1466
1467 /*
1468 * We're interested in MLD messages only.
1469 * - Version is 6
1470 * - MLD has always Router Alert hop-by-hop option
1471 * - But we do not support jumbrograms.
1472 */
1473 if (ip6h->version != 6 ||
1474 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1475 ip6h->payload_len == 0)
1476 return 0;
1477
ff9a57a6 1478 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
08b202b6
YH		 1479 if (skb->len < len)
1480 return -EINVAL;
1481
1482 nexthdr = ip6h->nexthdr;
1483 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
1484
1485 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1486 return 0;
1487
1488 /* Okay, we found ICMPv6 header */
1489 skb2 = skb_clone(skb, GFP_ATOMIC);
1490 if (!skb2)
1491 return -ENOMEM;
1492
9d89081d
TW		 1493 err = -EINVAL;
1494 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1495 goto out;
1496
08b202b6
YH		 1497 len -= offset - skb_network_offset(skb2);
1498
1499 __skb_pull(skb2, offset);
1500 skb_reset_transport_header(skb2);
1501
08b202b6
YH		 1502 icmp6h = icmp6_hdr(skb2);
1503
1504 switch (icmp6h->icmp6_type) {
1505 case ICMPV6_MGM_QUERY:
1506 case ICMPV6_MGM_REPORT:
1507 case ICMPV6_MGM_REDUCTION:
1508 case ICMPV6_MLD2_REPORT:
1509 break;
1510 default:
1511 err = 0;
1512 goto out;
1513 }
1514
1515 /* Okay, we found MLD message. Check further. */
1516 if (skb2->len > len) {
1517 err = pskb_trim_rcsum(skb2, len);
1518 if (err)
1519 goto out;
1520 }
1521
1522 switch (skb2->ip_summed) {
1523 case CHECKSUM_COMPLETE:
1524 if (!csum_fold(skb2->csum))
1525 break;
1526 /*FALLTHROUGH*/
1527 case CHECKSUM_NONE:
1528 skb2->csum = 0;
1529 if (skb_checksum_complete(skb2))
1530 goto out;
1531 }
1532
1533 err = 0;
1534
1535 BR_INPUT_SKB_CB(skb)->igmp = 1;
1536
1537 switch (icmp6h->icmp6_type) {
1538 case ICMPV6_MGM_REPORT:
1539 {
9d89081d
TW		 1540 struct mld_msg *mld;
1541 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1542 err = -EINVAL;
1543 goto out;
1544 }
1545 mld = (struct mld_msg *)skb_transport_header(skb2);
fc2af6c7 1546 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
08b202b6
YH		 1547 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1548 break;
1549 }
1550 case ICMPV6_MLD2_REPORT:
1551 err = br_ip6_multicast_mld2_report(br, port, skb2);
1552 break;
1553 case ICMPV6_MGM_QUERY:
1554 err = br_ip6_multicast_query(br, port, skb2);
1555 break;
1556 case ICMPV6_MGM_REDUCTION:
1557 {
9d89081d
TW		 1558 struct mld_msg *mld;
1559 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1560 err = -EINVAL;
1561 goto out;
1562 }
1563 mld = (struct mld_msg *)skb_transport_header(skb2);
08b202b6
YH		 1564 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1565 }
1566 }
1567
1568out:
9d89081d 1569 kfree_skb(skb2);
08b202b6
YH		 1570 return err;
1571}
1572#endif
1573
eb1d1641
HX		 1574int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1575 struct sk_buff *skb)
1576{
1fafc7a9
YH		 1577 BR_INPUT_SKB_CB(skb)->igmp = 0;
1578 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1579
eb1d1641
HX		 1580 if (br->multicast_disabled)
1581 return 0;
1582
1583 switch (skb->protocol) {
1584 case htons(ETH_P_IP):
1585 return br_multicast_ipv4_rcv(br, port, skb);
08b202b6
YH		 1586#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1587 case htons(ETH_P_IPV6):
1588 return br_multicast_ipv6_rcv(br, port, skb);
1589#endif
eb1d1641
HX		 1590 }
1591
1592 return 0;
1593}
1594
1595static void br_multicast_query_expired(unsigned long data)
1596{
1597 struct net_bridge *br = (void *)data;
1598
1599 spin_lock(&br->multicast_lock);
1600 if (br->multicast_startup_queries_sent <
1601 br->multicast_startup_query_count)
1602 br->multicast_startup_queries_sent++;
1603
1604 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1605
1606 spin_unlock(&br->multicast_lock);
1607}
1608
1609void br_multicast_init(struct net_bridge *br)
1610{
1611 br->hash_elasticity = 4;
1612 br->hash_max = 512;
1613
1614 br->multicast_router = 1;
1615 br->multicast_last_member_count = 2;
1616 br->multicast_startup_query_count = 2;
1617
1618 br->multicast_last_member_interval = HZ;
1619 br->multicast_query_response_interval = 10 * HZ;
1620 br->multicast_startup_query_interval = 125 * HZ / 4;
1621 br->multicast_query_interval = 125 * HZ;
1622 br->multicast_querier_interval = 255 * HZ;
1623 br->multicast_membership_interval = 260 * HZ;
1624
1625 spin_lock_init(&br->multicast_lock);
1626 setup_timer(&br->multicast_router_timer,
1627 br_multicast_local_router_expired, 0);
1628 setup_timer(&br->multicast_querier_timer,
1629 br_multicast_local_router_expired, 0);
1630 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1631 (unsigned long)br);
1632}
1633
1634void br_multicast_open(struct net_bridge *br)
1635{
1636 br->multicast_startup_queries_sent = 0;
1637
1638 if (br->multicast_disabled)
1639 return;
1640
1641 mod_timer(&br->multicast_query_timer, jiffies);
1642}
1643
1644void br_multicast_stop(struct net_bridge *br)
1645{
1646 struct net_bridge_mdb_htable *mdb;
1647 struct net_bridge_mdb_entry *mp;
1648 struct hlist_node *p, *n;
1649 u32 ver;
1650 int i;
1651
1652 del_timer_sync(&br->multicast_router_timer);
1653 del_timer_sync(&br->multicast_querier_timer);
1654 del_timer_sync(&br->multicast_query_timer);
1655
1656 spin_lock_bh(&br->multicast_lock);
e8051688 1657 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1658 if (!mdb)
1659 goto out;
1660
1661 br->mdb = NULL;
1662
1663 ver = mdb->ver;
1664 for (i = 0; i < mdb->max; i++) {
1665 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1666 hlist[ver]) {
1667 del_timer(&mp->timer);
1668 del_timer(&mp->query_timer);
1669 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1670 }
1671 }
1672
1673 if (mdb->old) {
1674 spin_unlock_bh(&br->multicast_lock);
10cc2b50 1675 rcu_barrier_bh();
eb1d1641
HX		 1676 spin_lock_bh(&br->multicast_lock);
1677 WARN_ON(mdb->old);
1678 }
1679
1680 mdb->old = mdb;
1681 call_rcu_bh(&mdb->rcu, br_mdb_free);
1682
1683out:
1684 spin_unlock_bh(&br->multicast_lock);
1685}
0909e117
HX		 1686
1687int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1688{
1689 int err = -ENOENT;
1690
1691 spin_lock_bh(&br->multicast_lock);
1692 if (!netif_running(br->dev))
1693 goto unlock;
1694
1695 switch (val) {
1696 case 0:
1697 case 2:
1698 del_timer(&br->multicast_router_timer);
1699 /* fall through */
1700 case 1:
1701 br->multicast_router = val;
1702 err = 0;
1703 break;
1704
1705 default:
1706 err = -EINVAL;
1707 break;
1708 }
1709
1710unlock:
1711 spin_unlock_bh(&br->multicast_lock);
1712
1713 return err;
1714}
1715
1716int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1717{
1718 struct net_bridge *br = p->br;
1719 int err = -ENOENT;
1720
1721 spin_lock(&br->multicast_lock);
1722 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1723 goto unlock;
1724
1725 switch (val) {
1726 case 0:
1727 case 1:
1728 case 2:
1729 p->multicast_router = val;
1730 err = 0;
1731
1732 if (val < 2 && !hlist_unhashed(&p->rlist))
1733 hlist_del_init_rcu(&p->rlist);
1734
1735 if (val == 1)
1736 break;
1737
1738 del_timer(&p->multicast_router_timer);
1739
1740 if (val == 0)
1741 break;
1742
1743 br_multicast_add_router(br, p);
1744 break;
1745
1746 default:
1747 err = -EINVAL;
1748 break;
1749 }
1750
1751unlock:
1752 spin_unlock(&br->multicast_lock);
1753
1754 return err;
1755}
561f1103
HX		 1756
1757int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1758{
1759 struct net_bridge_port *port;
3a7fda06 1760 int err = 0;
e8051688 1761 struct net_bridge_mdb_htable *mdb;
561f1103
HX		 1762
1763 spin_lock(&br->multicast_lock);
561f1103
HX		 1764 if (br->multicast_disabled == !val)
1765 goto unlock;
1766
1767 br->multicast_disabled = !val;
1768 if (br->multicast_disabled)
1769 goto unlock;
1770
3a7fda06
HX		 1771 if (!netif_running(br->dev))
1772 goto unlock;
1773
e8051688
ED		 1774 mdb = mlock_dereference(br->mdb, br);
1775 if (mdb) {
1776 if (mdb->old) {
561f1103
HX		 1777 err = -EEXIST;
1778rollback:
1779 br->multicast_disabled = !!val;
1780 goto unlock;
1781 }
1782
e8051688 1783 err = br_mdb_rehash(&br->mdb, mdb->max,
561f1103
HX		 1784 br->hash_elasticity);
1785 if (err)
1786 goto rollback;
1787 }
1788
1789 br_multicast_open(br);
1790 list_for_each_entry(port, &br->port_list, list) {
1791 if (port->state == BR_STATE_DISABLED ||
1792 port->state == BR_STATE_BLOCKING)
1793 continue;
1794
1795 __br_multicast_enable_port(port);
1796 }
1797
1798unlock:
1799 spin_unlock(&br->multicast_lock);
1800
1801 return err;
1802}
b195167f
HX		 1803
1804int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1805{
1806 int err = -ENOENT;
1807 u32 old;
e8051688 1808 struct net_bridge_mdb_htable *mdb;
b195167f
HX		 1809
1810 spin_lock(&br->multicast_lock);
1811 if (!netif_running(br->dev))
1812 goto unlock;
1813
1814 err = -EINVAL;
1815 if (!is_power_of_2(val))
1816 goto unlock;
e8051688
ED		 1817
1818 mdb = mlock_dereference(br->mdb, br);
1819 if (mdb && val < mdb->size)
b195167f
HX		 1820 goto unlock;
1821
1822 err = 0;
1823
1824 old = br->hash_max;
1825 br->hash_max = val;
1826
e8051688
ED		 1827 if (mdb) {
1828 if (mdb->old) {
b195167f
HX		 1829 err = -EEXIST;
1830rollback:
1831 br->hash_max = old;
1832 goto unlock;
1833 }
1834
1835 err = br_mdb_rehash(&br->mdb, br->hash_max,
1836 br->hash_elasticity);
1837 if (err)
1838 goto rollback;
1839 }
1840
1841unlock:
1842 spin_unlock(&br->multicast_lock);
1843
1844 return err;
1845}
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git