blob: a2a7a1a790819540030d9749e1adf8e7add5ac0d [file] [log] [blame]
Herbert Xueb1d1642010-02-27 19:41:45 +00001/*
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>
Herbert Xub1951672010-02-27 19:41:51 +000018#include <linux/log2.h>
Herbert Xueb1d1642010-02-27 19:41:45 +000019#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>
Eric Dumazetdfd56b82011-12-10 09:48:31 +000027#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090028#include <net/ipv6.h>
29#include <net/mld.h>
30#include <net/addrconf.h>
David S. Millerd4c4f072010-04-27 10:16:54 -070031#include <net/ip6_checksum.h>
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090032#endif
Herbert Xueb1d1642010-02-27 19:41:45 +000033
34#include "br_private.h"
35
Eric Dumazete8051682010-11-15 06:38:10 +000036#define mlock_dereference(X, br) \
37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
38
Herbert Xuc83b8fa2012-04-13 02:37:42 +000039static void br_multicast_start_querier(struct net_bridge *br);
40
Eric Dumazetdfd56b82011-12-10 09:48:31 +000041#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssinge4de9f92011-02-15 13:19:21 +000042static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
Herbert Xueb1d1642010-02-27 19:41:45 +000043{
Linus Lüssinge4de9f92011-02-15 13:19:21 +000044 if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090045 return 1;
46 return 0;
47}
48#endif
49
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090050static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
51{
52 if (a->proto != b->proto)
53 return 0;
54 switch (a->proto) {
55 case htons(ETH_P_IP):
56 return a->u.ip4 == b->u.ip4;
Eric Dumazetdfd56b82011-12-10 09:48:31 +000057#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090058 case htons(ETH_P_IPV6):
59 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
60#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090061 }
62 return 0;
63}
64
65static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
Herbert Xueb1d1642010-02-27 19:41:45 +000066{
Eric Dumazet0eae88f2010-04-20 19:06:52 -070067 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
Herbert Xueb1d1642010-02-27 19:41:45 +000068}
69
Eric Dumazetdfd56b82011-12-10 09:48:31 +000070#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090071static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
72 const struct in6_addr *ip)
73{
74 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
75}
76#endif
77
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090078static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
79 struct br_ip *ip)
80{
81 switch (ip->proto) {
82 case htons(ETH_P_IP):
83 return __br_ip4_hash(mdb, ip->u.ip4);
Eric Dumazetdfd56b82011-12-10 09:48:31 +000084#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090085 case htons(ETH_P_IPV6):
86 return __br_ip6_hash(mdb, &ip->u.ip6);
87#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090088 }
89 return 0;
Herbert Xueb1d1642010-02-27 19:41:45 +000090}
91
92static struct net_bridge_mdb_entry *__br_mdb_ip_get(
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090093 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
Herbert Xueb1d1642010-02-27 19:41:45 +000094{
95 struct net_bridge_mdb_entry *mp;
96 struct hlist_node *p;
97
Herbert Xu49f5fcf2010-03-05 21:07:39 +000098 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090099 if (br_ip_equal(&mp->addr, dst))
Herbert Xueb1d1642010-02-27 19:41:45 +0000100 return mp;
101 }
102
103 return NULL;
104}
105
Herbert Xu7f285fa2010-07-05 14:50:08 +0000106static struct net_bridge_mdb_entry *br_mdb_ip_get(
107 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
108{
109 if (!mdb)
110 return NULL;
111
112 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
113}
114
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900115static struct net_bridge_mdb_entry *br_mdb_ip4_get(
Herbert Xueb1d1642010-02-27 19:41:45 +0000116 struct net_bridge_mdb_htable *mdb, __be32 dst)
117{
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900118 struct br_ip br_dst;
Herbert Xu0821ec52010-03-15 20:38:25 -0700119
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900120 br_dst.u.ip4 = dst;
121 br_dst.proto = htons(ETH_P_IP);
122
Herbert Xu7f285fa2010-07-05 14:50:08 +0000123 return br_mdb_ip_get(mdb, &br_dst);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900124}
125
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000126#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900127static struct net_bridge_mdb_entry *br_mdb_ip6_get(
128 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
129{
130 struct br_ip br_dst;
131
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000132 br_dst.u.ip6 = *dst;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900133 br_dst.proto = htons(ETH_P_IPV6);
134
Herbert Xu7f285fa2010-07-05 14:50:08 +0000135 return br_mdb_ip_get(mdb, &br_dst);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900136}
137#endif
138
Herbert Xueb1d1642010-02-27 19:41:45 +0000139struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
140 struct sk_buff *skb)
141{
Eric Dumazete8051682010-11-15 06:38:10 +0000142 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900143 struct br_ip ip;
144
Herbert Xu7f285fa2010-07-05 14:50:08 +0000145 if (br->multicast_disabled)
Herbert Xueb1d1642010-02-27 19:41:45 +0000146 return NULL;
147
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900148 if (BR_INPUT_SKB_CB(skb)->igmp)
149 return NULL;
150
151 ip.proto = skb->protocol;
152
Herbert Xueb1d1642010-02-27 19:41:45 +0000153 switch (skb->protocol) {
154 case htons(ETH_P_IP):
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900155 ip.u.ip4 = ip_hdr(skb)->daddr;
156 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000157#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900158 case htons(ETH_P_IPV6):
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000159 ip.u.ip6 = ipv6_hdr(skb)->daddr;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900160 break;
161#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900162 default:
163 return NULL;
Herbert Xueb1d1642010-02-27 19:41:45 +0000164 }
165
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900166 return br_mdb_ip_get(mdb, &ip);
Herbert Xueb1d1642010-02-27 19:41:45 +0000167}
168
169static void br_mdb_free(struct rcu_head *head)
170{
171 struct net_bridge_mdb_htable *mdb =
172 container_of(head, struct net_bridge_mdb_htable, rcu);
173 struct net_bridge_mdb_htable *old = mdb->old;
174
175 mdb->old = NULL;
176 kfree(old->mhash);
177 kfree(old);
178}
179
180static int br_mdb_copy(struct net_bridge_mdb_htable *new,
181 struct net_bridge_mdb_htable *old,
182 int elasticity)
183{
184 struct net_bridge_mdb_entry *mp;
185 struct hlist_node *p;
186 int maxlen;
187 int len;
188 int i;
189
190 for (i = 0; i < old->max; i++)
191 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
192 hlist_add_head(&mp->hlist[new->ver],
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900193 &new->mhash[br_ip_hash(new, &mp->addr)]);
Herbert Xueb1d1642010-02-27 19:41:45 +0000194
195 if (!elasticity)
196 return 0;
197
198 maxlen = 0;
199 for (i = 0; i < new->max; i++) {
200 len = 0;
201 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
202 len++;
203 if (len > maxlen)
204 maxlen = len;
205 }
206
207 return maxlen > elasticity ? -EINVAL : 0;
208}
209
210static void br_multicast_free_pg(struct rcu_head *head)
211{
212 struct net_bridge_port_group *p =
213 container_of(head, struct net_bridge_port_group, rcu);
214
215 kfree(p);
216}
217
218static void br_multicast_free_group(struct rcu_head *head)
219{
220 struct net_bridge_mdb_entry *mp =
221 container_of(head, struct net_bridge_mdb_entry, rcu);
222
223 kfree(mp);
224}
225
226static void br_multicast_group_expired(unsigned long data)
227{
228 struct net_bridge_mdb_entry *mp = (void *)data;
229 struct net_bridge *br = mp->br;
230 struct net_bridge_mdb_htable *mdb;
231
232 spin_lock(&br->multicast_lock);
233 if (!netif_running(br->dev) || timer_pending(&mp->timer))
234 goto out;
235
Herbert Xu8a870172011-02-12 01:05:42 -0800236 mp->mglist = false;
Herbert Xueb1d1642010-02-27 19:41:45 +0000237
238 if (mp->ports)
239 goto out;
240
Eric Dumazete8051682010-11-15 06:38:10 +0000241 mdb = mlock_dereference(br->mdb, br);
242
Herbert Xueb1d1642010-02-27 19:41:45 +0000243 hlist_del_rcu(&mp->hlist[mdb->ver]);
244 mdb->size--;
245
Herbert Xueb1d1642010-02-27 19:41:45 +0000246 call_rcu_bh(&mp->rcu, br_multicast_free_group);
247
248out:
249 spin_unlock(&br->multicast_lock);
250}
251
252static void br_multicast_del_pg(struct net_bridge *br,
253 struct net_bridge_port_group *pg)
254{
Eric Dumazete8051682010-11-15 06:38:10 +0000255 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000256 struct net_bridge_mdb_entry *mp;
257 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +0000258 struct net_bridge_port_group __rcu **pp;
259
260 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +0000261
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900262 mp = br_mdb_ip_get(mdb, &pg->addr);
Herbert Xueb1d1642010-02-27 19:41:45 +0000263 if (WARN_ON(!mp))
264 return;
265
Eric Dumazete8051682010-11-15 06:38:10 +0000266 for (pp = &mp->ports;
267 (p = mlock_dereference(*pp, br)) != NULL;
268 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000269 if (p != pg)
270 continue;
271
stephen hemminger83f6a742010-04-27 15:01:06 +0000272 rcu_assign_pointer(*pp, p->next);
Herbert Xueb1d1642010-02-27 19:41:45 +0000273 hlist_del_init(&p->mglist);
274 del_timer(&p->timer);
Herbert Xueb1d1642010-02-27 19:41:45 +0000275 call_rcu_bh(&p->rcu, br_multicast_free_pg);
276
Herbert Xu8a870172011-02-12 01:05:42 -0800277 if (!mp->ports && !mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +0000278 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
Eric Dumazete8051682010-11-15 06:38:10 +0000303static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
Herbert Xueb1d1642010-02-27 19:41:45 +0000304 int elasticity)
305{
Eric Dumazete8051682010-11-15 06:38:10 +0000306 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000307 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
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900349static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
350 __be32 group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000351{
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
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000414#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900415static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000416 const struct in6_addr *group)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900417{
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);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900437 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);
David Stevens76d66152010-12-14 08:42:16 +0000445 ip6h->payload_len = htons(8 + sizeof(*mldq));
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900446 ip6h->nexthdr = IPPROTO_HOPOPTS;
447 ip6h->hop_limit = 1;
Linus Lüssinga7bff752011-03-22 11:40:32 +0000448 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
Ulrich Weberd1d81d42012-03-05 04:52:44 +0000449 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
450 &ip6h->saddr)) {
451 kfree_skb(skb);
452 return NULL;
453 }
Linus Lüssing36cff5a2011-02-17 08:17:51 +0000454 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900455
456 hopopt = (u8 *)(ip6h + 1);
457 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
458 hopopt[1] = 0; /* length of HbH */
459 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
460 hopopt[3] = 2; /* Length of RA Option */
461 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
462 hopopt[5] = 0;
Eldad Zack1de5a712012-05-17 06:00:25 +0000463 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
464 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900465
466 skb_put(skb, sizeof(*ip6h) + 8);
467
468 /* ICMPv6 */
469 skb_set_transport_header(skb, skb->len);
470 mldq = (struct mld_msg *) icmp6_hdr(skb);
471
472 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
473 br->multicast_query_response_interval;
474
475 mldq->mld_type = ICMPV6_MGM_QUERY;
476 mldq->mld_code = 0;
477 mldq->mld_cksum = 0;
478 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
479 mldq->mld_reserved = 0;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000480 mldq->mld_mca = *group;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900481
482 /* checksum */
483 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
484 sizeof(*mldq), IPPROTO_ICMPV6,
485 csum_partial(mldq,
486 sizeof(*mldq), 0));
487 skb_put(skb, sizeof(*mldq));
488
489 __skb_pull(skb, sizeof(*eth));
490
491out:
492 return skb;
493}
494#endif
495
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900496static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
497 struct br_ip *addr)
498{
499 switch (addr->proto) {
500 case htons(ETH_P_IP):
501 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000502#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900503 case htons(ETH_P_IPV6):
504 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
505#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900506 }
507 return NULL;
508}
509
Herbert Xueb1d1642010-02-27 19:41:45 +0000510static struct net_bridge_mdb_entry *br_multicast_get_group(
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900511 struct net_bridge *br, struct net_bridge_port *port,
512 struct br_ip *group, int hash)
Herbert Xueb1d1642010-02-27 19:41:45 +0000513{
Eric Dumazete8051682010-11-15 06:38:10 +0000514 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000515 struct net_bridge_mdb_entry *mp;
516 struct hlist_node *p;
Eric Dumazet95c96172012-04-15 05:58:06 +0000517 unsigned int count = 0;
518 unsigned int max;
Herbert Xueb1d1642010-02-27 19:41:45 +0000519 int elasticity;
520 int err;
521
Eric Dumazete8051682010-11-15 06:38:10 +0000522 mdb = rcu_dereference_protected(br->mdb, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000523 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
524 count++;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900525 if (unlikely(br_ip_equal(group, &mp->addr)))
Herbert Xueb1d1642010-02-27 19:41:45 +0000526 return mp;
Herbert Xueb1d1642010-02-27 19:41:45 +0000527 }
528
529 elasticity = 0;
530 max = mdb->max;
531
532 if (unlikely(count > br->hash_elasticity && count)) {
533 if (net_ratelimit())
stephen hemminger28a16c92010-05-10 09:31:09 +0000534 br_info(br, "Multicast hash table "
535 "chain limit reached: %s\n",
536 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000537
538 elasticity = br->hash_elasticity;
539 }
540
541 if (mdb->size >= max) {
542 max *= 2;
Thomas Graf036be6d2012-07-10 22:29:19 +0000543 if (unlikely(max > br->hash_max)) {
544 br_warn(br, "Multicast hash table maximum of %d "
545 "reached, disabling snooping: %s\n",
546 br->hash_max,
547 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000548 err = -E2BIG;
549disable:
550 br->multicast_disabled = 1;
551 goto err;
552 }
553 }
554
555 if (max > mdb->max || elasticity) {
556 if (mdb->old) {
557 if (net_ratelimit())
stephen hemminger28a16c92010-05-10 09:31:09 +0000558 br_info(br, "Multicast hash table "
559 "on fire: %s\n",
560 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000561 err = -EEXIST;
562 goto err;
563 }
564
565 err = br_mdb_rehash(&br->mdb, max, elasticity);
566 if (err) {
stephen hemminger28a16c92010-05-10 09:31:09 +0000567 br_warn(br, "Cannot rehash multicast "
568 "hash table, disabling snooping: %s, %d, %d\n",
569 port ? port->dev->name : br->dev->name,
570 mdb->size, err);
Herbert Xueb1d1642010-02-27 19:41:45 +0000571 goto disable;
572 }
573
574 err = -EAGAIN;
575 goto err;
576 }
577
578 return NULL;
579
580err:
581 mp = ERR_PTR(err);
582 return mp;
583}
584
585static struct net_bridge_mdb_entry *br_multicast_new_group(
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900586 struct net_bridge *br, struct net_bridge_port *port,
587 struct br_ip *group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000588{
Eric Dumazete8051682010-11-15 06:38:10 +0000589 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000590 struct net_bridge_mdb_entry *mp;
591 int hash;
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000592 int err;
Herbert Xueb1d1642010-02-27 19:41:45 +0000593
Eric Dumazete8051682010-11-15 06:38:10 +0000594 mdb = rcu_dereference_protected(br->mdb, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000595 if (!mdb) {
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000596 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
597 if (err)
598 return ERR_PTR(err);
Herbert Xueb1d1642010-02-27 19:41:45 +0000599 goto rehash;
600 }
601
602 hash = br_ip_hash(mdb, group);
603 mp = br_multicast_get_group(br, port, group, hash);
604 switch (PTR_ERR(mp)) {
605 case 0:
606 break;
607
608 case -EAGAIN:
609rehash:
Eric Dumazete8051682010-11-15 06:38:10 +0000610 mdb = rcu_dereference_protected(br->mdb, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000611 hash = br_ip_hash(mdb, group);
612 break;
613
614 default:
615 goto out;
616 }
617
618 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
619 if (unlikely(!mp))
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000620 return ERR_PTR(-ENOMEM);
Herbert Xueb1d1642010-02-27 19:41:45 +0000621
622 mp->br = br;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900623 mp->addr = *group;
Herbert Xueb1d1642010-02-27 19:41:45 +0000624 setup_timer(&mp->timer, br_multicast_group_expired,
625 (unsigned long)mp);
Herbert Xueb1d1642010-02-27 19:41:45 +0000626
627 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
628 mdb->size++;
629
630out:
631 return mp;
632}
633
634static int br_multicast_add_group(struct net_bridge *br,
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900635 struct net_bridge_port *port,
636 struct br_ip *group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000637{
638 struct net_bridge_mdb_entry *mp;
639 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +0000640 struct net_bridge_port_group __rcu **pp;
Herbert Xueb1d1642010-02-27 19:41:45 +0000641 unsigned long now = jiffies;
642 int err;
643
Herbert Xueb1d1642010-02-27 19:41:45 +0000644 spin_lock(&br->multicast_lock);
645 if (!netif_running(br->dev) ||
646 (port && port->state == BR_STATE_DISABLED))
647 goto out;
648
649 mp = br_multicast_new_group(br, port, group);
650 err = PTR_ERR(mp);
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000651 if (IS_ERR(mp))
Herbert Xueb1d1642010-02-27 19:41:45 +0000652 goto err;
653
654 if (!port) {
Herbert Xu8a870172011-02-12 01:05:42 -0800655 mp->mglist = true;
Herbert Xueb1d1642010-02-27 19:41:45 +0000656 mod_timer(&mp->timer, now + br->multicast_membership_interval);
657 goto out;
658 }
659
Eric Dumazete8051682010-11-15 06:38:10 +0000660 for (pp = &mp->ports;
661 (p = mlock_dereference(*pp, br)) != NULL;
662 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000663 if (p->port == port)
664 goto found;
665 if ((unsigned long)p->port < (unsigned long)port)
666 break;
667 }
668
669 p = kzalloc(sizeof(*p), GFP_ATOMIC);
670 err = -ENOMEM;
671 if (unlikely(!p))
672 goto err;
673
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900674 p->addr = *group;
Herbert Xueb1d1642010-02-27 19:41:45 +0000675 p->port = port;
676 p->next = *pp;
677 hlist_add_head(&p->mglist, &port->mglist);
678 setup_timer(&p->timer, br_multicast_port_group_expired,
679 (unsigned long)p);
Herbert Xueb1d1642010-02-27 19:41:45 +0000680
681 rcu_assign_pointer(*pp, p);
682
683found:
684 mod_timer(&p->timer, now + br->multicast_membership_interval);
685out:
686 err = 0;
687
688err:
689 spin_unlock(&br->multicast_lock);
690 return err;
691}
692
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900693static int br_ip4_multicast_add_group(struct net_bridge *br,
694 struct net_bridge_port *port,
695 __be32 group)
696{
697 struct br_ip br_group;
698
699 if (ipv4_is_local_multicast(group))
700 return 0;
701
702 br_group.u.ip4 = group;
703 br_group.proto = htons(ETH_P_IP);
704
705 return br_multicast_add_group(br, port, &br_group);
706}
707
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000708#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900709static int br_ip6_multicast_add_group(struct net_bridge *br,
710 struct net_bridge_port *port,
711 const struct in6_addr *group)
712{
713 struct br_ip br_group;
714
Linus Lüssinge4de9f92011-02-15 13:19:21 +0000715 if (!ipv6_is_transient_multicast(group))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900716 return 0;
717
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000718 br_group.u.ip6 = *group;
Linus Lüssing9cc6e0c2011-02-15 13:19:17 +0000719 br_group.proto = htons(ETH_P_IPV6);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900720
721 return br_multicast_add_group(br, port, &br_group);
722}
723#endif
724
Herbert Xueb1d1642010-02-27 19:41:45 +0000725static void br_multicast_router_expired(unsigned long data)
726{
727 struct net_bridge_port *port = (void *)data;
728 struct net_bridge *br = port->br;
729
730 spin_lock(&br->multicast_lock);
731 if (port->multicast_router != 1 ||
732 timer_pending(&port->multicast_router_timer) ||
733 hlist_unhashed(&port->rlist))
734 goto out;
735
736 hlist_del_init_rcu(&port->rlist);
737
738out:
739 spin_unlock(&br->multicast_lock);
740}
741
742static void br_multicast_local_router_expired(unsigned long data)
743{
744}
745
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000746static void br_multicast_querier_expired(unsigned long data)
747{
Herbert Xubb63f1f2012-04-30 00:22:56 +0000748 struct net_bridge *br = (void *)data;
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000749
750 spin_lock(&br->multicast_lock);
751 if (!netif_running(br->dev) || br->multicast_disabled)
752 goto out;
753
754 br_multicast_start_querier(br);
755
756out:
757 spin_unlock(&br->multicast_lock);
758}
759
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900760static void __br_multicast_send_query(struct net_bridge *br,
761 struct net_bridge_port *port,
762 struct br_ip *ip)
Herbert Xueb1d1642010-02-27 19:41:45 +0000763{
Herbert Xueb1d1642010-02-27 19:41:45 +0000764 struct sk_buff *skb;
765
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900766 skb = br_multicast_alloc_query(br, ip);
Herbert Xueb1d1642010-02-27 19:41:45 +0000767 if (!skb)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900768 return;
Herbert Xueb1d1642010-02-27 19:41:45 +0000769
770 if (port) {
771 __skb_push(skb, sizeof(struct ethhdr));
772 skb->dev = port->dev;
Jan Engelhardt713aefa2010-03-23 04:07:21 +0100773 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
Herbert Xueb1d1642010-02-27 19:41:45 +0000774 dev_queue_xmit);
775 } else
776 netif_rx(skb);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900777}
Herbert Xueb1d1642010-02-27 19:41:45 +0000778
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900779static void br_multicast_send_query(struct net_bridge *br,
780 struct net_bridge_port *port, u32 sent)
781{
782 unsigned long time;
783 struct br_ip br_group;
784
785 if (!netif_running(br->dev) || br->multicast_disabled ||
Herbert Xuc5c23262012-04-13 02:37:42 +0000786 !br->multicast_querier ||
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900787 timer_pending(&br->multicast_querier_timer))
788 return;
789
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900790 memset(&br_group.u, 0, sizeof(br_group.u));
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900791
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900792 br_group.proto = htons(ETH_P_IP);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900793 __br_multicast_send_query(br, port, &br_group);
794
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000795#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900796 br_group.proto = htons(ETH_P_IPV6);
797 __br_multicast_send_query(br, port, &br_group);
798#endif
799
Herbert Xueb1d1642010-02-27 19:41:45 +0000800 time = jiffies;
801 time += sent < br->multicast_startup_query_count ?
802 br->multicast_startup_query_interval :
803 br->multicast_query_interval;
804 mod_timer(port ? &port->multicast_query_timer :
805 &br->multicast_query_timer, time);
806}
807
808static void br_multicast_port_query_expired(unsigned long data)
809{
810 struct net_bridge_port *port = (void *)data;
811 struct net_bridge *br = port->br;
812
813 spin_lock(&br->multicast_lock);
Dan Carpenter02a780c2010-03-06 01:14:09 +0000814 if (port->state == BR_STATE_DISABLED ||
815 port->state == BR_STATE_BLOCKING)
Herbert Xueb1d1642010-02-27 19:41:45 +0000816 goto out;
817
818 if (port->multicast_startup_queries_sent <
819 br->multicast_startup_query_count)
820 port->multicast_startup_queries_sent++;
821
822 br_multicast_send_query(port->br, port,
823 port->multicast_startup_queries_sent);
824
825out:
826 spin_unlock(&br->multicast_lock);
827}
828
829void br_multicast_add_port(struct net_bridge_port *port)
830{
831 port->multicast_router = 1;
832
833 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
834 (unsigned long)port);
835 setup_timer(&port->multicast_query_timer,
836 br_multicast_port_query_expired, (unsigned long)port);
837}
838
839void br_multicast_del_port(struct net_bridge_port *port)
840{
841 del_timer_sync(&port->multicast_router_timer);
842}
843
Herbert Xu561f1102010-02-27 19:41:50 +0000844static void __br_multicast_enable_port(struct net_bridge_port *port)
845{
846 port->multicast_startup_queries_sent = 0;
847
848 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
849 del_timer(&port->multicast_query_timer))
850 mod_timer(&port->multicast_query_timer, jiffies);
851}
852
Herbert Xueb1d1642010-02-27 19:41:45 +0000853void br_multicast_enable_port(struct net_bridge_port *port)
854{
855 struct net_bridge *br = port->br;
856
857 spin_lock(&br->multicast_lock);
858 if (br->multicast_disabled || !netif_running(br->dev))
859 goto out;
860
Herbert Xu561f1102010-02-27 19:41:50 +0000861 __br_multicast_enable_port(port);
Herbert Xueb1d1642010-02-27 19:41:45 +0000862
863out:
864 spin_unlock(&br->multicast_lock);
865}
866
867void br_multicast_disable_port(struct net_bridge_port *port)
868{
869 struct net_bridge *br = port->br;
870 struct net_bridge_port_group *pg;
871 struct hlist_node *p, *n;
872
873 spin_lock(&br->multicast_lock);
874 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
875 br_multicast_del_pg(br, pg);
876
877 if (!hlist_unhashed(&port->rlist))
878 hlist_del_init_rcu(&port->rlist);
879 del_timer(&port->multicast_router_timer);
880 del_timer(&port->multicast_query_timer);
881 spin_unlock(&br->multicast_lock);
882}
883
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900884static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
885 struct net_bridge_port *port,
886 struct sk_buff *skb)
Herbert Xueb1d1642010-02-27 19:41:45 +0000887{
888 struct igmpv3_report *ih;
889 struct igmpv3_grec *grec;
890 int i;
891 int len;
892 int num;
893 int type;
894 int err = 0;
895 __be32 group;
896
897 if (!pskb_may_pull(skb, sizeof(*ih)))
898 return -EINVAL;
899
900 ih = igmpv3_report_hdr(skb);
901 num = ntohs(ih->ngrec);
902 len = sizeof(*ih);
903
904 for (i = 0; i < num; i++) {
905 len += sizeof(*grec);
906 if (!pskb_may_pull(skb, len))
907 return -EINVAL;
908
Herbert Xufd218cf2010-04-07 21:20:47 -0700909 grec = (void *)(skb->data + len - sizeof(*grec));
Herbert Xueb1d1642010-02-27 19:41:45 +0000910 group = grec->grec_mca;
911 type = grec->grec_type;
912
Eric Dumazet8eabf952010-04-20 03:20:05 +0000913 len += ntohs(grec->grec_nsrcs) * 4;
Herbert Xueb1d1642010-02-27 19:41:45 +0000914 if (!pskb_may_pull(skb, len))
915 return -EINVAL;
916
917 /* We treat this as an IGMPv2 report for now. */
918 switch (type) {
919 case IGMPV3_MODE_IS_INCLUDE:
920 case IGMPV3_MODE_IS_EXCLUDE:
921 case IGMPV3_CHANGE_TO_INCLUDE:
922 case IGMPV3_CHANGE_TO_EXCLUDE:
923 case IGMPV3_ALLOW_NEW_SOURCES:
924 case IGMPV3_BLOCK_OLD_SOURCES:
925 break;
926
927 default:
928 continue;
929 }
930
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900931 err = br_ip4_multicast_add_group(br, port, group);
Herbert Xueb1d1642010-02-27 19:41:45 +0000932 if (err)
933 break;
934 }
935
936 return err;
937}
938
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000939#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900940static int br_ip6_multicast_mld2_report(struct net_bridge *br,
941 struct net_bridge_port *port,
942 struct sk_buff *skb)
943{
944 struct icmp6hdr *icmp6h;
945 struct mld2_grec *grec;
946 int i;
947 int len;
948 int num;
949 int err = 0;
950
951 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
952 return -EINVAL;
953
954 icmp6h = icmp6_hdr(skb);
955 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
956 len = sizeof(*icmp6h);
957
958 for (i = 0; i < num; i++) {
959 __be16 *nsrcs, _nsrcs;
960
961 nsrcs = skb_header_pointer(skb,
962 len + offsetof(struct mld2_grec,
Linus Lüssing649e9842011-02-15 13:19:18 +0000963 grec_nsrcs),
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900964 sizeof(_nsrcs), &_nsrcs);
965 if (!nsrcs)
966 return -EINVAL;
967
968 if (!pskb_may_pull(skb,
969 len + sizeof(*grec) +
Linus Lüssingd41db9f2011-02-15 13:19:19 +0000970 sizeof(struct in6_addr) * ntohs(*nsrcs)))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900971 return -EINVAL;
972
973 grec = (struct mld2_grec *)(skb->data + len);
Linus Lüssingd41db9f2011-02-15 13:19:19 +0000974 len += sizeof(*grec) +
975 sizeof(struct in6_addr) * ntohs(*nsrcs);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900976
977 /* We treat these as MLDv1 reports for now. */
978 switch (grec->grec_type) {
979 case MLD2_MODE_IS_INCLUDE:
980 case MLD2_MODE_IS_EXCLUDE:
981 case MLD2_CHANGE_TO_INCLUDE:
982 case MLD2_CHANGE_TO_EXCLUDE:
983 case MLD2_ALLOW_NEW_SOURCES:
984 case MLD2_BLOCK_OLD_SOURCES:
985 break;
986
987 default:
988 continue;
989 }
990
991 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
992 if (!err)
993 break;
994 }
995
996 return err;
997}
998#endif
999
stephen hemminger7e80c122010-04-27 15:01:04 +00001000/*
1001 * Add port to rotuer_list
1002 * list is maintained ordered by pointer value
1003 * and locked by br->multicast_lock and RCU
1004 */
Herbert Xu0909e112010-02-27 19:41:49 +00001005static void br_multicast_add_router(struct net_bridge *br,
1006 struct net_bridge_port *port)
1007{
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001008 struct net_bridge_port *p;
stephen hemminger7e80c122010-04-27 15:01:04 +00001009 struct hlist_node *n, *slot = NULL;
Herbert Xu0909e112010-02-27 19:41:49 +00001010
David S. Miller709b9322010-04-27 16:49:58 -07001011 hlist_for_each_entry(p, n, &br->router_list, rlist) {
stephen hemminger7e80c122010-04-27 15:01:04 +00001012 if ((unsigned long) port >= (unsigned long) p)
1013 break;
1014 slot = n;
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001015 }
Herbert Xu0909e112010-02-27 19:41:49 +00001016
stephen hemminger7e80c122010-04-27 15:01:04 +00001017 if (slot)
1018 hlist_add_after_rcu(slot, &port->rlist);
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001019 else
1020 hlist_add_head_rcu(&port->rlist, &br->router_list);
Herbert Xu0909e112010-02-27 19:41:49 +00001021}
1022
Herbert Xueb1d1642010-02-27 19:41:45 +00001023static void br_multicast_mark_router(struct net_bridge *br,
1024 struct net_bridge_port *port)
1025{
1026 unsigned long now = jiffies;
Herbert Xueb1d1642010-02-27 19:41:45 +00001027
1028 if (!port) {
1029 if (br->multicast_router == 1)
1030 mod_timer(&br->multicast_router_timer,
1031 now + br->multicast_querier_interval);
1032 return;
1033 }
1034
1035 if (port->multicast_router != 1)
1036 return;
1037
1038 if (!hlist_unhashed(&port->rlist))
1039 goto timer;
1040
Herbert Xu0909e112010-02-27 19:41:49 +00001041 br_multicast_add_router(br, port);
Herbert Xueb1d1642010-02-27 19:41:45 +00001042
1043timer:
1044 mod_timer(&port->multicast_router_timer,
1045 now + br->multicast_querier_interval);
1046}
1047
1048static void br_multicast_query_received(struct net_bridge *br,
1049 struct net_bridge_port *port,
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001050 int saddr)
Herbert Xueb1d1642010-02-27 19:41:45 +00001051{
1052 if (saddr)
1053 mod_timer(&br->multicast_querier_timer,
1054 jiffies + br->multicast_querier_interval);
1055 else if (timer_pending(&br->multicast_querier_timer))
1056 return;
1057
1058 br_multicast_mark_router(br, port);
1059}
1060
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001061static int br_ip4_multicast_query(struct net_bridge *br,
1062 struct net_bridge_port *port,
1063 struct sk_buff *skb)
Herbert Xueb1d1642010-02-27 19:41:45 +00001064{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001065 const struct iphdr *iph = ip_hdr(skb);
Herbert Xueb1d1642010-02-27 19:41:45 +00001066 struct igmphdr *ih = igmp_hdr(skb);
1067 struct net_bridge_mdb_entry *mp;
1068 struct igmpv3_query *ih3;
1069 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +00001070 struct net_bridge_port_group __rcu **pp;
Herbert Xueb1d1642010-02-27 19:41:45 +00001071 unsigned long max_delay;
1072 unsigned long now = jiffies;
1073 __be32 group;
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001074 int err = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001075
1076 spin_lock(&br->multicast_lock);
1077 if (!netif_running(br->dev) ||
1078 (port && port->state == BR_STATE_DISABLED))
1079 goto out;
1080
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001081 br_multicast_query_received(br, port, !!iph->saddr);
Herbert Xueb1d1642010-02-27 19:41:45 +00001082
1083 group = ih->group;
1084
1085 if (skb->len == sizeof(*ih)) {
1086 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1087
1088 if (!max_delay) {
1089 max_delay = 10 * HZ;
1090 group = 0;
1091 }
1092 } else {
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001093 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1094 err = -EINVAL;
1095 goto out;
1096 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001097
1098 ih3 = igmpv3_query_hdr(skb);
1099 if (ih3->nsrcs)
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001100 goto out;
Herbert Xueb1d1642010-02-27 19:41:45 +00001101
YOSHIFUJI Hideaki / 吉藤英明0ba8c9e2010-03-15 19:27:00 +00001102 max_delay = ih3->code ?
1103 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
Herbert Xueb1d1642010-02-27 19:41:45 +00001104 }
1105
1106 if (!group)
1107 goto out;
1108
Eric Dumazete8051682010-11-15 06:38:10 +00001109 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
Herbert Xueb1d1642010-02-27 19:41:45 +00001110 if (!mp)
1111 goto out;
1112
1113 max_delay *= br->multicast_last_member_count;
1114
Herbert Xu8a870172011-02-12 01:05:42 -08001115 if (mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +00001116 (timer_pending(&mp->timer) ?
1117 time_after(mp->timer.expires, now + max_delay) :
1118 try_to_del_timer_sync(&mp->timer) >= 0))
1119 mod_timer(&mp->timer, now + max_delay);
1120
Eric Dumazete8051682010-11-15 06:38:10 +00001121 for (pp = &mp->ports;
1122 (p = mlock_dereference(*pp, br)) != NULL;
1123 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +00001124 if (timer_pending(&p->timer) ?
1125 time_after(p->timer.expires, now + max_delay) :
1126 try_to_del_timer_sync(&p->timer) >= 0)
Herbert Xu24f9cdc2011-02-11 12:42:07 +00001127 mod_timer(&p->timer, now + max_delay);
Herbert Xueb1d1642010-02-27 19:41:45 +00001128 }
1129
1130out:
1131 spin_unlock(&br->multicast_lock);
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001132 return err;
Herbert Xueb1d1642010-02-27 19:41:45 +00001133}
1134
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001135#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001136static int br_ip6_multicast_query(struct net_bridge *br,
1137 struct net_bridge_port *port,
1138 struct sk_buff *skb)
1139{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001140 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001141 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1142 struct net_bridge_mdb_entry *mp;
1143 struct mld2_query *mld2q;
Eric Dumazete8051682010-11-15 06:38:10 +00001144 struct net_bridge_port_group *p;
1145 struct net_bridge_port_group __rcu **pp;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001146 unsigned long max_delay;
1147 unsigned long now = jiffies;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001148 const struct in6_addr *group = NULL;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001149 int err = 0;
1150
1151 spin_lock(&br->multicast_lock);
1152 if (!netif_running(br->dev) ||
1153 (port && port->state == BR_STATE_DISABLED))
1154 goto out;
1155
1156 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1157
1158 if (skb->len == sizeof(*mld)) {
1159 if (!pskb_may_pull(skb, sizeof(*mld))) {
1160 err = -EINVAL;
1161 goto out;
1162 }
1163 mld = (struct mld_msg *) icmp6_hdr(skb);
Li RongQing47152132012-07-09 23:56:12 +00001164 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001165 if (max_delay)
1166 group = &mld->mld_mca;
1167 } else if (skb->len >= sizeof(*mld2q)) {
1168 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1169 err = -EINVAL;
1170 goto out;
1171 }
1172 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1173 if (!mld2q->mld2q_nsrcs)
1174 group = &mld2q->mld2q_mca;
1175 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1176 }
1177
1178 if (!group)
1179 goto out;
1180
Eric Dumazete8051682010-11-15 06:38:10 +00001181 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001182 if (!mp)
1183 goto out;
1184
1185 max_delay *= br->multicast_last_member_count;
Herbert Xu8a870172011-02-12 01:05:42 -08001186 if (mp->mglist &&
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001187 (timer_pending(&mp->timer) ?
1188 time_after(mp->timer.expires, now + max_delay) :
1189 try_to_del_timer_sync(&mp->timer) >= 0))
1190 mod_timer(&mp->timer, now + max_delay);
1191
Eric Dumazete8051682010-11-15 06:38:10 +00001192 for (pp = &mp->ports;
1193 (p = mlock_dereference(*pp, br)) != NULL;
1194 pp = &p->next) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001195 if (timer_pending(&p->timer) ?
1196 time_after(p->timer.expires, now + max_delay) :
1197 try_to_del_timer_sync(&p->timer) >= 0)
Herbert Xu24f9cdc2011-02-11 12:42:07 +00001198 mod_timer(&p->timer, now + max_delay);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001199 }
1200
1201out:
1202 spin_unlock(&br->multicast_lock);
1203 return err;
1204}
1205#endif
1206
Herbert Xueb1d1642010-02-27 19:41:45 +00001207static void br_multicast_leave_group(struct net_bridge *br,
1208 struct net_bridge_port *port,
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001209 struct br_ip *group)
Herbert Xueb1d1642010-02-27 19:41:45 +00001210{
1211 struct net_bridge_mdb_htable *mdb;
1212 struct net_bridge_mdb_entry *mp;
1213 struct net_bridge_port_group *p;
1214 unsigned long now;
1215 unsigned long time;
1216
Herbert Xueb1d1642010-02-27 19:41:45 +00001217 spin_lock(&br->multicast_lock);
1218 if (!netif_running(br->dev) ||
1219 (port && port->state == BR_STATE_DISABLED) ||
1220 timer_pending(&br->multicast_querier_timer))
1221 goto out;
1222
Eric Dumazete8051682010-11-15 06:38:10 +00001223 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +00001224 mp = br_mdb_ip_get(mdb, group);
1225 if (!mp)
1226 goto out;
1227
David S. Millerc2d3bab2012-12-05 16:24:45 -05001228 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
Amerigo Wang50426b52012-12-03 23:56:40 +00001229 struct net_bridge_port_group __rcu **pp;
1230
1231 for (pp = &mp->ports;
1232 (p = mlock_dereference(*pp, br)) != NULL;
1233 pp = &p->next) {
1234 if (p->port != port)
1235 continue;
1236
1237 rcu_assign_pointer(*pp, p->next);
1238 hlist_del_init(&p->mglist);
1239 del_timer(&p->timer);
1240 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1241
1242 if (!mp->ports && !mp->mglist &&
1243 netif_running(br->dev))
1244 mod_timer(&mp->timer, jiffies);
1245 }
1246 goto out;
1247 }
1248
Herbert Xueb1d1642010-02-27 19:41:45 +00001249 now = jiffies;
1250 time = now + br->multicast_last_member_count *
1251 br->multicast_last_member_interval;
1252
1253 if (!port) {
Herbert Xu8a870172011-02-12 01:05:42 -08001254 if (mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +00001255 (timer_pending(&mp->timer) ?
1256 time_after(mp->timer.expires, time) :
1257 try_to_del_timer_sync(&mp->timer) >= 0)) {
1258 mod_timer(&mp->timer, time);
Herbert Xueb1d1642010-02-27 19:41:45 +00001259 }
1260
1261 goto out;
1262 }
1263
Eric Dumazete8051682010-11-15 06:38:10 +00001264 for (p = mlock_dereference(mp->ports, br);
1265 p != NULL;
1266 p = mlock_dereference(p->next, br)) {
Herbert Xueb1d1642010-02-27 19:41:45 +00001267 if (p->port != port)
1268 continue;
1269
1270 if (!hlist_unhashed(&p->mglist) &&
1271 (timer_pending(&p->timer) ?
1272 time_after(p->timer.expires, time) :
1273 try_to_del_timer_sync(&p->timer) >= 0)) {
1274 mod_timer(&p->timer, time);
Herbert Xueb1d1642010-02-27 19:41:45 +00001275 }
1276
1277 break;
1278 }
1279
1280out:
1281 spin_unlock(&br->multicast_lock);
1282}
1283
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001284static void br_ip4_multicast_leave_group(struct net_bridge *br,
1285 struct net_bridge_port *port,
1286 __be32 group)
1287{
1288 struct br_ip br_group;
1289
1290 if (ipv4_is_local_multicast(group))
1291 return;
1292
1293 br_group.u.ip4 = group;
1294 br_group.proto = htons(ETH_P_IP);
1295
1296 br_multicast_leave_group(br, port, &br_group);
1297}
1298
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001299#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001300static void br_ip6_multicast_leave_group(struct net_bridge *br,
1301 struct net_bridge_port *port,
1302 const struct in6_addr *group)
1303{
1304 struct br_ip br_group;
1305
Linus Lüssinge4de9f92011-02-15 13:19:21 +00001306 if (!ipv6_is_transient_multicast(group))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001307 return;
1308
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001309 br_group.u.ip6 = *group;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001310 br_group.proto = htons(ETH_P_IPV6);
1311
1312 br_multicast_leave_group(br, port, &br_group);
1313}
1314#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001315
Herbert Xueb1d1642010-02-27 19:41:45 +00001316static int br_multicast_ipv4_rcv(struct net_bridge *br,
1317 struct net_bridge_port *port,
1318 struct sk_buff *skb)
1319{
1320 struct sk_buff *skb2 = skb;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001321 const struct iphdr *iph;
Herbert Xueb1d1642010-02-27 19:41:45 +00001322 struct igmphdr *ih;
Eric Dumazet95c96172012-04-15 05:58:06 +00001323 unsigned int len;
1324 unsigned int offset;
Herbert Xueb1d1642010-02-27 19:41:45 +00001325 int err;
1326
Herbert Xueb1d1642010-02-27 19:41:45 +00001327 /* We treat OOM as packet loss for now. */
1328 if (!pskb_may_pull(skb, sizeof(*iph)))
1329 return -EINVAL;
1330
1331 iph = ip_hdr(skb);
1332
1333 if (iph->ihl < 5 || iph->version != 4)
1334 return -EINVAL;
1335
1336 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1337 return -EINVAL;
1338
1339 iph = ip_hdr(skb);
1340
1341 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1342 return -EINVAL;
1343
Herbert Xubd4265f2011-06-23 02:39:12 +00001344 if (iph->protocol != IPPROTO_IGMP) {
1345 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
1346 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Herbert Xueb1d1642010-02-27 19:41:45 +00001347 return 0;
Herbert Xubd4265f2011-06-23 02:39:12 +00001348 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001349
1350 len = ntohs(iph->tot_len);
1351 if (skb->len < len || len < ip_hdrlen(skb))
1352 return -EINVAL;
1353
1354 if (skb->len > len) {
1355 skb2 = skb_clone(skb, GFP_ATOMIC);
1356 if (!skb2)
1357 return -ENOMEM;
1358
1359 err = pskb_trim_rcsum(skb2, len);
1360 if (err)
YOSHIFUJI Hideaki / 吉藤英明84408532010-03-15 19:26:56 +00001361 goto err_out;
Herbert Xueb1d1642010-02-27 19:41:45 +00001362 }
1363
1364 len -= ip_hdrlen(skb2);
1365 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1366 __skb_pull(skb2, offset);
1367 skb_reset_transport_header(skb2);
1368
1369 err = -EINVAL;
1370 if (!pskb_may_pull(skb2, sizeof(*ih)))
1371 goto out;
1372
Herbert Xueb1d1642010-02-27 19:41:45 +00001373 switch (skb2->ip_summed) {
1374 case CHECKSUM_COMPLETE:
1375 if (!csum_fold(skb2->csum))
1376 break;
1377 /* fall through */
1378 case CHECKSUM_NONE:
1379 skb2->csum = 0;
1380 if (skb_checksum_complete(skb2))
YOSHIFUJI Hideaki / 吉藤英明84408532010-03-15 19:26:56 +00001381 goto out;
Herbert Xueb1d1642010-02-27 19:41:45 +00001382 }
1383
1384 err = 0;
1385
1386 BR_INPUT_SKB_CB(skb)->igmp = 1;
1387 ih = igmp_hdr(skb2);
1388
1389 switch (ih->type) {
1390 case IGMP_HOST_MEMBERSHIP_REPORT:
1391 case IGMPV2_HOST_MEMBERSHIP_REPORT:
Fernando Luis Vázquez Cao62b2bcb2011-06-13 15:04:43 +00001392 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001393 err = br_ip4_multicast_add_group(br, port, ih->group);
Herbert Xueb1d1642010-02-27 19:41:45 +00001394 break;
1395 case IGMPV3_HOST_MEMBERSHIP_REPORT:
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001396 err = br_ip4_multicast_igmp3_report(br, port, skb2);
Herbert Xueb1d1642010-02-27 19:41:45 +00001397 break;
1398 case IGMP_HOST_MEMBERSHIP_QUERY:
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001399 err = br_ip4_multicast_query(br, port, skb2);
Herbert Xueb1d1642010-02-27 19:41:45 +00001400 break;
1401 case IGMP_HOST_LEAVE_MESSAGE:
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001402 br_ip4_multicast_leave_group(br, port, ih->group);
Herbert Xueb1d1642010-02-27 19:41:45 +00001403 break;
1404 }
1405
1406out:
1407 __skb_push(skb2, offset);
YOSHIFUJI Hideaki / 吉藤英明84408532010-03-15 19:26:56 +00001408err_out:
Herbert Xueb1d1642010-02-27 19:41:45 +00001409 if (skb2 != skb)
1410 kfree_skb(skb2);
1411 return err;
1412}
1413
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001414#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001415static int br_multicast_ipv6_rcv(struct net_bridge *br,
1416 struct net_bridge_port *port,
1417 struct sk_buff *skb)
1418{
Tomas Winkler9d890812011-01-03 11:26:08 -08001419 struct sk_buff *skb2;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001420 const struct ipv6hdr *ip6h;
Eric Dumazet22df1332011-08-23 19:57:05 +00001421 u8 icmp6_type;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001422 u8 nexthdr;
Jesse Gross75f28112011-11-30 17:05:51 -08001423 __be16 frag_off;
Eric Dumazet95c96172012-04-15 05:58:06 +00001424 unsigned int len;
Kulikov Vasiliybb7a0bd2010-07-15 08:47:33 +00001425 int offset;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001426 int err;
1427
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001428 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1429 return -EINVAL;
1430
1431 ip6h = ipv6_hdr(skb);
1432
1433 /*
1434 * We're interested in MLD messages only.
1435 * - Version is 6
1436 * - MLD has always Router Alert hop-by-hop option
1437 * - But we do not support jumbrograms.
1438 */
1439 if (ip6h->version != 6 ||
1440 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1441 ip6h->payload_len == 0)
1442 return 0;
1443
Linus Lüssingff9a57a2011-03-26 20:27:24 +00001444 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001445 if (skb->len < len)
1446 return -EINVAL;
1447
1448 nexthdr = ip6h->nexthdr;
Jesse Gross75f28112011-11-30 17:05:51 -08001449 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001450
1451 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1452 return 0;
1453
1454 /* Okay, we found ICMPv6 header */
1455 skb2 = skb_clone(skb, GFP_ATOMIC);
1456 if (!skb2)
1457 return -ENOMEM;
1458
Tomas Winkler9d890812011-01-03 11:26:08 -08001459 err = -EINVAL;
1460 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1461 goto out;
1462
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001463 len -= offset - skb_network_offset(skb2);
1464
1465 __skb_pull(skb2, offset);
1466 skb_reset_transport_header(skb2);
stephen hemmingerfa2da8c2011-11-15 08:09:14 +00001467 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1468 skb_network_header_len(skb2));
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001469
Eric Dumazet22df1332011-08-23 19:57:05 +00001470 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001471
Eric Dumazet22df1332011-08-23 19:57:05 +00001472 switch (icmp6_type) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001473 case ICMPV6_MGM_QUERY:
1474 case ICMPV6_MGM_REPORT:
1475 case ICMPV6_MGM_REDUCTION:
1476 case ICMPV6_MLD2_REPORT:
1477 break;
1478 default:
1479 err = 0;
1480 goto out;
1481 }
1482
1483 /* Okay, we found MLD message. Check further. */
1484 if (skb2->len > len) {
1485 err = pskb_trim_rcsum(skb2, len);
1486 if (err)
1487 goto out;
Yan, Zheng4b275d72011-08-23 22:54:33 +00001488 err = -EINVAL;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001489 }
1490
Yan, Zheng4b275d72011-08-23 22:54:33 +00001491 ip6h = ipv6_hdr(skb2);
1492
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001493 switch (skb2->ip_summed) {
1494 case CHECKSUM_COMPLETE:
Yan, Zheng4b275d72011-08-23 22:54:33 +00001495 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1496 IPPROTO_ICMPV6, skb2->csum))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001497 break;
1498 /*FALLTHROUGH*/
1499 case CHECKSUM_NONE:
Yan, Zheng4b275d72011-08-23 22:54:33 +00001500 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1501 &ip6h->daddr,
1502 skb2->len,
1503 IPPROTO_ICMPV6, 0));
1504 if (__skb_checksum_complete(skb2))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001505 goto out;
1506 }
1507
1508 err = 0;
1509
1510 BR_INPUT_SKB_CB(skb)->igmp = 1;
1511
Eric Dumazet22df1332011-08-23 19:57:05 +00001512 switch (icmp6_type) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001513 case ICMPV6_MGM_REPORT:
1514 {
Tomas Winkler9d890812011-01-03 11:26:08 -08001515 struct mld_msg *mld;
1516 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1517 err = -EINVAL;
1518 goto out;
1519 }
1520 mld = (struct mld_msg *)skb_transport_header(skb2);
Fernando Luis Vázquez Caofc2af6c2011-06-13 15:06:58 +00001521 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001522 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1523 break;
1524 }
1525 case ICMPV6_MLD2_REPORT:
1526 err = br_ip6_multicast_mld2_report(br, port, skb2);
1527 break;
1528 case ICMPV6_MGM_QUERY:
1529 err = br_ip6_multicast_query(br, port, skb2);
1530 break;
1531 case ICMPV6_MGM_REDUCTION:
1532 {
Tomas Winkler9d890812011-01-03 11:26:08 -08001533 struct mld_msg *mld;
1534 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1535 err = -EINVAL;
1536 goto out;
1537 }
1538 mld = (struct mld_msg *)skb_transport_header(skb2);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001539 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1540 }
1541 }
1542
1543out:
Tomas Winkler9d890812011-01-03 11:26:08 -08001544 kfree_skb(skb2);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001545 return err;
1546}
1547#endif
1548
Herbert Xueb1d1642010-02-27 19:41:45 +00001549int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1550 struct sk_buff *skb)
1551{
YOSHIFUJI Hideaki / 吉藤英明1fafc7a2010-04-25 08:06:40 +00001552 BR_INPUT_SKB_CB(skb)->igmp = 0;
1553 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1554
Herbert Xueb1d1642010-02-27 19:41:45 +00001555 if (br->multicast_disabled)
1556 return 0;
1557
1558 switch (skb->protocol) {
1559 case htons(ETH_P_IP):
1560 return br_multicast_ipv4_rcv(br, port, skb);
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001561#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001562 case htons(ETH_P_IPV6):
1563 return br_multicast_ipv6_rcv(br, port, skb);
1564#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001565 }
1566
1567 return 0;
1568}
1569
1570static void br_multicast_query_expired(unsigned long data)
1571{
1572 struct net_bridge *br = (void *)data;
1573
1574 spin_lock(&br->multicast_lock);
1575 if (br->multicast_startup_queries_sent <
1576 br->multicast_startup_query_count)
1577 br->multicast_startup_queries_sent++;
1578
1579 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1580
1581 spin_unlock(&br->multicast_lock);
1582}
1583
1584void br_multicast_init(struct net_bridge *br)
1585{
1586 br->hash_elasticity = 4;
1587 br->hash_max = 512;
1588
1589 br->multicast_router = 1;
Herbert Xuc5c23262012-04-13 02:37:42 +00001590 br->multicast_querier = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001591 br->multicast_last_member_count = 2;
1592 br->multicast_startup_query_count = 2;
1593
1594 br->multicast_last_member_interval = HZ;
1595 br->multicast_query_response_interval = 10 * HZ;
1596 br->multicast_startup_query_interval = 125 * HZ / 4;
1597 br->multicast_query_interval = 125 * HZ;
1598 br->multicast_querier_interval = 255 * HZ;
1599 br->multicast_membership_interval = 260 * HZ;
1600
1601 spin_lock_init(&br->multicast_lock);
1602 setup_timer(&br->multicast_router_timer,
1603 br_multicast_local_router_expired, 0);
1604 setup_timer(&br->multicast_querier_timer,
Herbert Xubb63f1f2012-04-30 00:22:56 +00001605 br_multicast_querier_expired, (unsigned long)br);
Herbert Xueb1d1642010-02-27 19:41:45 +00001606 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1607 (unsigned long)br);
1608}
1609
1610void br_multicast_open(struct net_bridge *br)
1611{
1612 br->multicast_startup_queries_sent = 0;
1613
1614 if (br->multicast_disabled)
1615 return;
1616
1617 mod_timer(&br->multicast_query_timer, jiffies);
1618}
1619
1620void br_multicast_stop(struct net_bridge *br)
1621{
1622 struct net_bridge_mdb_htable *mdb;
1623 struct net_bridge_mdb_entry *mp;
1624 struct hlist_node *p, *n;
1625 u32 ver;
1626 int i;
1627
1628 del_timer_sync(&br->multicast_router_timer);
1629 del_timer_sync(&br->multicast_querier_timer);
1630 del_timer_sync(&br->multicast_query_timer);
1631
1632 spin_lock_bh(&br->multicast_lock);
Eric Dumazete8051682010-11-15 06:38:10 +00001633 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +00001634 if (!mdb)
1635 goto out;
1636
1637 br->mdb = NULL;
1638
1639 ver = mdb->ver;
1640 for (i = 0; i < mdb->max; i++) {
1641 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1642 hlist[ver]) {
1643 del_timer(&mp->timer);
Herbert Xueb1d1642010-02-27 19:41:45 +00001644 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1645 }
1646 }
1647
1648 if (mdb->old) {
1649 spin_unlock_bh(&br->multicast_lock);
Herbert Xu10cc2b52010-03-05 21:03:35 +00001650 rcu_barrier_bh();
Herbert Xueb1d1642010-02-27 19:41:45 +00001651 spin_lock_bh(&br->multicast_lock);
1652 WARN_ON(mdb->old);
1653 }
1654
1655 mdb->old = mdb;
1656 call_rcu_bh(&mdb->rcu, br_mdb_free);
1657
1658out:
1659 spin_unlock_bh(&br->multicast_lock);
1660}
Herbert Xu0909e112010-02-27 19:41:49 +00001661
1662int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1663{
1664 int err = -ENOENT;
1665
1666 spin_lock_bh(&br->multicast_lock);
1667 if (!netif_running(br->dev))
1668 goto unlock;
1669
1670 switch (val) {
1671 case 0:
1672 case 2:
1673 del_timer(&br->multicast_router_timer);
1674 /* fall through */
1675 case 1:
1676 br->multicast_router = val;
1677 err = 0;
1678 break;
1679
1680 default:
1681 err = -EINVAL;
1682 break;
1683 }
1684
1685unlock:
1686 spin_unlock_bh(&br->multicast_lock);
1687
1688 return err;
1689}
1690
1691int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1692{
1693 struct net_bridge *br = p->br;
1694 int err = -ENOENT;
1695
1696 spin_lock(&br->multicast_lock);
1697 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1698 goto unlock;
1699
1700 switch (val) {
1701 case 0:
1702 case 1:
1703 case 2:
1704 p->multicast_router = val;
1705 err = 0;
1706
1707 if (val < 2 && !hlist_unhashed(&p->rlist))
1708 hlist_del_init_rcu(&p->rlist);
1709
1710 if (val == 1)
1711 break;
1712
1713 del_timer(&p->multicast_router_timer);
1714
1715 if (val == 0)
1716 break;
1717
1718 br_multicast_add_router(br, p);
1719 break;
1720
1721 default:
1722 err = -EINVAL;
1723 break;
1724 }
1725
1726unlock:
1727 spin_unlock(&br->multicast_lock);
1728
1729 return err;
1730}
Herbert Xu561f1102010-02-27 19:41:50 +00001731
Herbert Xu74857212012-04-13 02:37:42 +00001732static void br_multicast_start_querier(struct net_bridge *br)
Herbert Xu561f1102010-02-27 19:41:50 +00001733{
1734 struct net_bridge_port *port;
Herbert Xu74857212012-04-13 02:37:42 +00001735
1736 br_multicast_open(br);
1737
1738 list_for_each_entry(port, &br->port_list, list) {
1739 if (port->state == BR_STATE_DISABLED ||
1740 port->state == BR_STATE_BLOCKING)
1741 continue;
1742
1743 __br_multicast_enable_port(port);
1744 }
1745}
1746
1747int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1748{
Herbert Xu3a7fda02010-07-29 00:45:30 +00001749 int err = 0;
Eric Dumazete8051682010-11-15 06:38:10 +00001750 struct net_bridge_mdb_htable *mdb;
Herbert Xu561f1102010-02-27 19:41:50 +00001751
Andrey Vaginef5e0d82011-11-10 05:48:03 +00001752 spin_lock_bh(&br->multicast_lock);
Herbert Xu561f1102010-02-27 19:41:50 +00001753 if (br->multicast_disabled == !val)
1754 goto unlock;
1755
1756 br->multicast_disabled = !val;
1757 if (br->multicast_disabled)
1758 goto unlock;
1759
Herbert Xu3a7fda02010-07-29 00:45:30 +00001760 if (!netif_running(br->dev))
1761 goto unlock;
1762
Eric Dumazete8051682010-11-15 06:38:10 +00001763 mdb = mlock_dereference(br->mdb, br);
1764 if (mdb) {
1765 if (mdb->old) {
Herbert Xu561f1102010-02-27 19:41:50 +00001766 err = -EEXIST;
1767rollback:
1768 br->multicast_disabled = !!val;
1769 goto unlock;
1770 }
1771
Eric Dumazete8051682010-11-15 06:38:10 +00001772 err = br_mdb_rehash(&br->mdb, mdb->max,
Herbert Xu561f1102010-02-27 19:41:50 +00001773 br->hash_elasticity);
1774 if (err)
1775 goto rollback;
1776 }
1777
Herbert Xu74857212012-04-13 02:37:42 +00001778 br_multicast_start_querier(br);
Herbert Xu561f1102010-02-27 19:41:50 +00001779
1780unlock:
Andrey Vaginef5e0d82011-11-10 05:48:03 +00001781 spin_unlock_bh(&br->multicast_lock);
Herbert Xu561f1102010-02-27 19:41:50 +00001782
1783 return err;
1784}
Herbert Xub1951672010-02-27 19:41:51 +00001785
Herbert Xuc5c23262012-04-13 02:37:42 +00001786int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1787{
1788 val = !!val;
1789
1790 spin_lock_bh(&br->multicast_lock);
1791 if (br->multicast_querier == val)
1792 goto unlock;
1793
1794 br->multicast_querier = val;
1795 if (val)
1796 br_multicast_start_querier(br);
1797
1798unlock:
1799 spin_unlock_bh(&br->multicast_lock);
1800
1801 return 0;
1802}
1803
Herbert Xub1951672010-02-27 19:41:51 +00001804int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1805{
1806 int err = -ENOENT;
1807 u32 old;
Eric Dumazete8051682010-11-15 06:38:10 +00001808 struct net_bridge_mdb_htable *mdb;
Herbert Xub1951672010-02-27 19:41:51 +00001809
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;
Eric Dumazete8051682010-11-15 06:38:10 +00001817
1818 mdb = mlock_dereference(br->mdb, br);
1819 if (mdb && val < mdb->size)
Herbert Xub1951672010-02-27 19:41:51 +00001820 goto unlock;
1821
1822 err = 0;
1823
1824 old = br->hash_max;
1825 br->hash_max = val;
1826
Eric Dumazete8051682010-11-15 06:38:10 +00001827 if (mdb) {
1828 if (mdb->old) {
Herbert Xub1951672010-02-27 19:41:51 +00001829 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}