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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>
Linus Lüssing07f8ac42014-06-07 18:26:28 +020014#include <linux/export.h>
Herbert Xueb1d1642010-02-27 19:41:45 +000015#include <linux/if_ether.h>
16#include <linux/igmp.h>
17#include <linux/jhash.h>
18#include <linux/kernel.h>
Herbert Xub1951672010-02-27 19:41:51 +000019#include <linux/log2.h>
Herbert Xueb1d1642010-02-27 19:41:45 +000020#include <linux/netdevice.h>
21#include <linux/netfilter_bridge.h>
22#include <linux/random.h>
23#include <linux/rculist.h>
24#include <linux/skbuff.h>
25#include <linux/slab.h>
26#include <linux/timer.h>
Cong Wang1c8ad5b2013-05-21 21:52:54 +000027#include <linux/inetdevice.h>
Herbert Xueb1d1642010-02-27 19:41:45 +000028#include <net/ip.h>
Eric Dumazetdfd56b82011-12-10 09:48:31 +000029#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090030#include <net/ipv6.h>
31#include <net/mld.h>
David S. Millerd4c4f072010-04-27 10:16:54 -070032#include <net/ip6_checksum.h>
Linus Lüssing3c3769e2013-09-04 02:13:39 +020033#include <net/addrconf.h>
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090034#endif
Herbert Xueb1d1642010-02-27 19:41:45 +000035
36#include "br_private.h"
37
Linus Lüssingcc0fdd82013-08-30 17:28:17 +020038static void br_multicast_start_querier(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +020039 struct bridge_mcast_own_query *query);
Satish Ashok754bc542015-06-19 01:22:57 -070040static void br_multicast_add_router(struct net_bridge *br,
41 struct net_bridge_port *port);
Satish Ashokbc8c20a2015-07-13 05:28:37 -070042static void br_ip4_multicast_leave_group(struct net_bridge *br,
43 struct net_bridge_port *port,
44 __be32 group,
45 __u16 vid);
46#if IS_ENABLED(CONFIG_IPV6)
47static void br_ip6_multicast_leave_group(struct net_bridge *br,
48 struct net_bridge_port *port,
49 const struct in6_addr *group,
50 __u16 vid);
51#endif
Cong Wang2ce297f2012-12-10 02:15:35 +000052unsigned int br_mdb_rehash_seq;
Herbert Xuc83b8fa2012-04-13 02:37:42 +000053
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090054static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
55{
56 if (a->proto != b->proto)
57 return 0;
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000058 if (a->vid != b->vid)
59 return 0;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090060 switch (a->proto) {
61 case htons(ETH_P_IP):
62 return a->u.ip4 == b->u.ip4;
Eric Dumazetdfd56b82011-12-10 09:48:31 +000063#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090064 case htons(ETH_P_IPV6):
65 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
66#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090067 }
68 return 0;
69}
70
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000071static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
72 __u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +000073{
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000074 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
Herbert Xueb1d1642010-02-27 19:41:45 +000075}
76
Eric Dumazetdfd56b82011-12-10 09:48:31 +000077#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090078static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000079 const struct in6_addr *ip,
80 __u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090081{
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000082 return jhash_2words(ipv6_addr_hash(ip), vid,
83 mdb->secret) & (mdb->max - 1);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090084}
85#endif
86
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090087static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
88 struct br_ip *ip)
89{
90 switch (ip->proto) {
91 case htons(ETH_P_IP):
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000092 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
Eric Dumazetdfd56b82011-12-10 09:48:31 +000093#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090094 case htons(ETH_P_IPV6):
Vlad Yasevichb0e9a302013-02-13 12:00:17 +000095 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +090096#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +090097 }
98 return 0;
Herbert Xueb1d1642010-02-27 19:41:45 +000099}
100
101static struct net_bridge_mdb_entry *__br_mdb_ip_get(
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900102 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
Herbert Xueb1d1642010-02-27 19:41:45 +0000103{
104 struct net_bridge_mdb_entry *mp;
Herbert Xueb1d1642010-02-27 19:41:45 +0000105
Sasha Levinb67bfe02013-02-27 17:06:00 -0800106 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900107 if (br_ip_equal(&mp->addr, dst))
Herbert Xueb1d1642010-02-27 19:41:45 +0000108 return mp;
109 }
110
111 return NULL;
112}
113
Cong Wangcfd56752012-12-11 22:23:08 +0000114struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
115 struct br_ip *dst)
Herbert Xu7f285fa2010-07-05 14:50:08 +0000116{
117 if (!mdb)
118 return NULL;
119
120 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
121}
122
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900123static struct net_bridge_mdb_entry *br_mdb_ip4_get(
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000124 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +0000125{
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900126 struct br_ip br_dst;
Herbert Xu0821ec52010-03-15 20:38:25 -0700127
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900128 br_dst.u.ip4 = dst;
129 br_dst.proto = htons(ETH_P_IP);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000130 br_dst.vid = vid;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900131
Herbert Xu7f285fa2010-07-05 14:50:08 +0000132 return br_mdb_ip_get(mdb, &br_dst);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900133}
134
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000135#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900136static struct net_bridge_mdb_entry *br_mdb_ip6_get(
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000137 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
138 __u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900139{
140 struct br_ip br_dst;
141
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000142 br_dst.u.ip6 = *dst;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900143 br_dst.proto = htons(ETH_P_IPV6);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000144 br_dst.vid = vid;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900145
Herbert Xu7f285fa2010-07-05 14:50:08 +0000146 return br_mdb_ip_get(mdb, &br_dst);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900147}
148#endif
149
Herbert Xueb1d1642010-02-27 19:41:45 +0000150struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
Cong Wangfbca58a2013-03-07 03:05:33 +0000151 struct sk_buff *skb, u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +0000152{
Eric Dumazete8051682010-11-15 06:38:10 +0000153 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900154 struct br_ip ip;
155
Herbert Xu7f285fa2010-07-05 14:50:08 +0000156 if (br->multicast_disabled)
Herbert Xueb1d1642010-02-27 19:41:45 +0000157 return NULL;
158
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900159 if (BR_INPUT_SKB_CB(skb)->igmp)
160 return NULL;
161
162 ip.proto = skb->protocol;
Cong Wangfbca58a2013-03-07 03:05:33 +0000163 ip.vid = vid;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900164
Herbert Xueb1d1642010-02-27 19:41:45 +0000165 switch (skb->protocol) {
166 case htons(ETH_P_IP):
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900167 ip.u.ip4 = ip_hdr(skb)->daddr;
168 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000169#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900170 case htons(ETH_P_IPV6):
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000171 ip.u.ip6 = ipv6_hdr(skb)->daddr;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900172 break;
173#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900174 default:
175 return NULL;
Herbert Xueb1d1642010-02-27 19:41:45 +0000176 }
177
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900178 return br_mdb_ip_get(mdb, &ip);
Herbert Xueb1d1642010-02-27 19:41:45 +0000179}
180
181static void br_mdb_free(struct rcu_head *head)
182{
183 struct net_bridge_mdb_htable *mdb =
184 container_of(head, struct net_bridge_mdb_htable, rcu);
185 struct net_bridge_mdb_htable *old = mdb->old;
186
187 mdb->old = NULL;
188 kfree(old->mhash);
189 kfree(old);
190}
191
192static int br_mdb_copy(struct net_bridge_mdb_htable *new,
193 struct net_bridge_mdb_htable *old,
194 int elasticity)
195{
196 struct net_bridge_mdb_entry *mp;
Herbert Xueb1d1642010-02-27 19:41:45 +0000197 int maxlen;
198 int len;
199 int i;
200
201 for (i = 0; i < old->max; i++)
Sasha Levinb67bfe02013-02-27 17:06:00 -0800202 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
Herbert Xueb1d1642010-02-27 19:41:45 +0000203 hlist_add_head(&mp->hlist[new->ver],
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900204 &new->mhash[br_ip_hash(new, &mp->addr)]);
Herbert Xueb1d1642010-02-27 19:41:45 +0000205
206 if (!elasticity)
207 return 0;
208
209 maxlen = 0;
210 for (i = 0; i < new->max; i++) {
211 len = 0;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800212 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
Herbert Xueb1d1642010-02-27 19:41:45 +0000213 len++;
214 if (len > maxlen)
215 maxlen = len;
216 }
217
218 return maxlen > elasticity ? -EINVAL : 0;
219}
220
Cong Wangcfd56752012-12-11 22:23:08 +0000221void br_multicast_free_pg(struct rcu_head *head)
Herbert Xueb1d1642010-02-27 19:41:45 +0000222{
223 struct net_bridge_port_group *p =
224 container_of(head, struct net_bridge_port_group, rcu);
225
226 kfree(p);
227}
228
229static void br_multicast_free_group(struct rcu_head *head)
230{
231 struct net_bridge_mdb_entry *mp =
232 container_of(head, struct net_bridge_mdb_entry, rcu);
233
234 kfree(mp);
235}
236
237static void br_multicast_group_expired(unsigned long data)
238{
239 struct net_bridge_mdb_entry *mp = (void *)data;
240 struct net_bridge *br = mp->br;
241 struct net_bridge_mdb_htable *mdb;
242
243 spin_lock(&br->multicast_lock);
244 if (!netif_running(br->dev) || timer_pending(&mp->timer))
245 goto out;
246
Herbert Xu8a870172011-02-12 01:05:42 -0800247 mp->mglist = false;
Herbert Xueb1d1642010-02-27 19:41:45 +0000248
249 if (mp->ports)
250 goto out;
251
Eric Dumazete8051682010-11-15 06:38:10 +0000252 mdb = mlock_dereference(br->mdb, br);
253
Herbert Xueb1d1642010-02-27 19:41:45 +0000254 hlist_del_rcu(&mp->hlist[mdb->ver]);
255 mdb->size--;
256
Herbert Xueb1d1642010-02-27 19:41:45 +0000257 call_rcu_bh(&mp->rcu, br_multicast_free_group);
258
259out:
260 spin_unlock(&br->multicast_lock);
261}
262
263static void br_multicast_del_pg(struct net_bridge *br,
264 struct net_bridge_port_group *pg)
265{
Eric Dumazete8051682010-11-15 06:38:10 +0000266 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000267 struct net_bridge_mdb_entry *mp;
268 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +0000269 struct net_bridge_port_group __rcu **pp;
270
271 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +0000272
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900273 mp = br_mdb_ip_get(mdb, &pg->addr);
Herbert Xueb1d1642010-02-27 19:41:45 +0000274 if (WARN_ON(!mp))
275 return;
276
Eric Dumazete8051682010-11-15 06:38:10 +0000277 for (pp = &mp->ports;
278 (p = mlock_dereference(*pp, br)) != NULL;
279 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000280 if (p != pg)
281 continue;
282
stephen hemminger83f6a742010-04-27 15:01:06 +0000283 rcu_assign_pointer(*pp, p->next);
Herbert Xueb1d1642010-02-27 19:41:45 +0000284 hlist_del_init(&p->mglist);
285 del_timer(&p->timer);
Nikolay Aleksandrovef8299de2015-07-15 07:16:50 -0700286 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
287 p->state);
Herbert Xueb1d1642010-02-27 19:41:45 +0000288 call_rcu_bh(&p->rcu, br_multicast_free_pg);
289
Linus Lüssing454594f2013-10-20 00:58:57 +0200290 if (!mp->ports && !mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +0000291 netif_running(br->dev))
292 mod_timer(&mp->timer, jiffies);
293
294 return;
295 }
296
297 WARN_ON(1);
298}
299
300static void br_multicast_port_group_expired(unsigned long data)
301{
302 struct net_bridge_port_group *pg = (void *)data;
303 struct net_bridge *br = pg->port->br;
304
305 spin_lock(&br->multicast_lock);
306 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
Amerigo Wangccb1c312012-12-14 22:09:51 +0000307 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
Herbert Xueb1d1642010-02-27 19:41:45 +0000308 goto out;
309
310 br_multicast_del_pg(br, pg);
311
312out:
313 spin_unlock(&br->multicast_lock);
314}
315
Eric Dumazete8051682010-11-15 06:38:10 +0000316static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
Herbert Xueb1d1642010-02-27 19:41:45 +0000317 int elasticity)
318{
Eric Dumazete8051682010-11-15 06:38:10 +0000319 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000320 struct net_bridge_mdb_htable *mdb;
321 int err;
322
323 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
324 if (!mdb)
325 return -ENOMEM;
326
327 mdb->max = max;
328 mdb->old = old;
329
330 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
331 if (!mdb->mhash) {
332 kfree(mdb);
333 return -ENOMEM;
334 }
335
336 mdb->size = old ? old->size : 0;
337 mdb->ver = old ? old->ver ^ 1 : 0;
338
339 if (!old || elasticity)
340 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
341 else
342 mdb->secret = old->secret;
343
344 if (!old)
345 goto out;
346
347 err = br_mdb_copy(mdb, old, elasticity);
348 if (err) {
349 kfree(mdb->mhash);
350 kfree(mdb);
351 return err;
352 }
353
Cong Wang2ce297f2012-12-10 02:15:35 +0000354 br_mdb_rehash_seq++;
Herbert Xueb1d1642010-02-27 19:41:45 +0000355 call_rcu_bh(&mdb->rcu, br_mdb_free);
356
357out:
358 rcu_assign_pointer(*mdbp, mdb);
359
360 return 0;
361}
362
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900363static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
364 __be32 group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000365{
366 struct sk_buff *skb;
367 struct igmphdr *ih;
368 struct ethhdr *eth;
369 struct iphdr *iph;
370
371 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
372 sizeof(*ih) + 4);
373 if (!skb)
374 goto out;
375
376 skb->protocol = htons(ETH_P_IP);
377
378 skb_reset_mac_header(skb);
379 eth = eth_hdr(skb);
380
Joe Perchese5a727f2014-02-23 00:05:25 -0800381 ether_addr_copy(eth->h_source, br->dev->dev_addr);
Herbert Xueb1d1642010-02-27 19:41:45 +0000382 eth->h_dest[0] = 1;
383 eth->h_dest[1] = 0;
384 eth->h_dest[2] = 0x5e;
385 eth->h_dest[3] = 0;
386 eth->h_dest[4] = 0;
387 eth->h_dest[5] = 1;
388 eth->h_proto = htons(ETH_P_IP);
389 skb_put(skb, sizeof(*eth));
390
391 skb_set_network_header(skb, skb->len);
392 iph = ip_hdr(skb);
393
394 iph->version = 4;
395 iph->ihl = 6;
396 iph->tos = 0xc0;
397 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
398 iph->id = 0;
399 iph->frag_off = htons(IP_DF);
400 iph->ttl = 1;
401 iph->protocol = IPPROTO_IGMP;
Cong Wang1c8ad5b2013-05-21 21:52:54 +0000402 iph->saddr = br->multicast_query_use_ifaddr ?
403 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
Herbert Xueb1d1642010-02-27 19:41:45 +0000404 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
405 ((u8 *)&iph[1])[0] = IPOPT_RA;
406 ((u8 *)&iph[1])[1] = 4;
407 ((u8 *)&iph[1])[2] = 0;
408 ((u8 *)&iph[1])[3] = 0;
409 ip_send_check(iph);
410 skb_put(skb, 24);
411
412 skb_set_transport_header(skb, skb->len);
413 ih = igmp_hdr(skb);
414 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
415 ih->code = (group ? br->multicast_last_member_interval :
416 br->multicast_query_response_interval) /
417 (HZ / IGMP_TIMER_SCALE);
418 ih->group = group;
419 ih->csum = 0;
420 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
421 skb_put(skb, sizeof(*ih));
422
423 __skb_pull(skb, sizeof(*eth));
424
425out:
426 return skb;
427}
428
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000429#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900430static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000431 const struct in6_addr *group)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900432{
433 struct sk_buff *skb;
434 struct ipv6hdr *ip6h;
435 struct mld_msg *mldq;
436 struct ethhdr *eth;
437 u8 *hopopt;
438 unsigned long interval;
439
440 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
441 8 + sizeof(*mldq));
442 if (!skb)
443 goto out;
444
445 skb->protocol = htons(ETH_P_IPV6);
446
447 /* Ethernet header */
448 skb_reset_mac_header(skb);
449 eth = eth_hdr(skb);
450
Joe Perchese5a727f2014-02-23 00:05:25 -0800451 ether_addr_copy(eth->h_source, br->dev->dev_addr);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900452 eth->h_proto = htons(ETH_P_IPV6);
453 skb_put(skb, sizeof(*eth));
454
455 /* IPv6 header + HbH option */
456 skb_set_network_header(skb, skb->len);
457 ip6h = ipv6_hdr(skb);
458
459 *(__force __be32 *)ip6h = htonl(0x60000000);
David Stevens76d66152010-12-14 08:42:16 +0000460 ip6h->payload_len = htons(8 + sizeof(*mldq));
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900461 ip6h->nexthdr = IPPROTO_HOPOPTS;
462 ip6h->hop_limit = 1;
Linus Lüssinga7bff752011-03-22 11:40:32 +0000463 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
Ulrich Weberd1d81d42012-03-05 04:52:44 +0000464 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
465 &ip6h->saddr)) {
466 kfree_skb(skb);
467 return NULL;
468 }
Linus Lüssing36cff5a2011-02-17 08:17:51 +0000469 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900470
471 hopopt = (u8 *)(ip6h + 1);
472 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
473 hopopt[1] = 0; /* length of HbH */
474 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
475 hopopt[3] = 2; /* Length of RA Option */
476 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
477 hopopt[5] = 0;
Eldad Zack1de5a712012-05-17 06:00:25 +0000478 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
479 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900480
481 skb_put(skb, sizeof(*ip6h) + 8);
482
483 /* ICMPv6 */
484 skb_set_transport_header(skb, skb->len);
485 mldq = (struct mld_msg *) icmp6_hdr(skb);
486
Linus Lüssing32de8682013-06-16 23:20:34 +0200487 interval = ipv6_addr_any(group) ?
488 br->multicast_query_response_interval :
489 br->multicast_last_member_interval;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900490
491 mldq->mld_type = ICMPV6_MGM_QUERY;
492 mldq->mld_code = 0;
493 mldq->mld_cksum = 0;
494 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
495 mldq->mld_reserved = 0;
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000496 mldq->mld_mca = *group;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900497
498 /* checksum */
499 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
500 sizeof(*mldq), IPPROTO_ICMPV6,
501 csum_partial(mldq,
502 sizeof(*mldq), 0));
503 skb_put(skb, sizeof(*mldq));
504
505 __skb_pull(skb, sizeof(*eth));
506
507out:
508 return skb;
509}
510#endif
511
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900512static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
513 struct br_ip *addr)
514{
515 switch (addr->proto) {
516 case htons(ETH_P_IP):
517 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000518#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900519 case htons(ETH_P_IPV6):
520 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
521#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900522 }
523 return NULL;
524}
525
Herbert Xueb1d1642010-02-27 19:41:45 +0000526static struct net_bridge_mdb_entry *br_multicast_get_group(
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900527 struct net_bridge *br, struct net_bridge_port *port,
528 struct br_ip *group, int hash)
Herbert Xueb1d1642010-02-27 19:41:45 +0000529{
Eric Dumazete8051682010-11-15 06:38:10 +0000530 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000531 struct net_bridge_mdb_entry *mp;
Eric Dumazet95c96172012-04-15 05:58:06 +0000532 unsigned int count = 0;
533 unsigned int max;
Herbert Xueb1d1642010-02-27 19:41:45 +0000534 int elasticity;
535 int err;
536
Eric Dumazete8051682010-11-15 06:38:10 +0000537 mdb = rcu_dereference_protected(br->mdb, 1);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800538 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000539 count++;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900540 if (unlikely(br_ip_equal(group, &mp->addr)))
Herbert Xueb1d1642010-02-27 19:41:45 +0000541 return mp;
Herbert Xueb1d1642010-02-27 19:41:45 +0000542 }
543
544 elasticity = 0;
545 max = mdb->max;
546
547 if (unlikely(count > br->hash_elasticity && count)) {
548 if (net_ratelimit())
stephen hemminger28a16c92010-05-10 09:31:09 +0000549 br_info(br, "Multicast hash table "
550 "chain limit reached: %s\n",
551 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000552
553 elasticity = br->hash_elasticity;
554 }
555
556 if (mdb->size >= max) {
557 max *= 2;
Thomas Graf036be6d2012-07-10 22:29:19 +0000558 if (unlikely(max > br->hash_max)) {
559 br_warn(br, "Multicast hash table maximum of %d "
560 "reached, disabling snooping: %s\n",
561 br->hash_max,
562 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000563 err = -E2BIG;
564disable:
565 br->multicast_disabled = 1;
566 goto err;
567 }
568 }
569
570 if (max > mdb->max || elasticity) {
571 if (mdb->old) {
572 if (net_ratelimit())
stephen hemminger28a16c92010-05-10 09:31:09 +0000573 br_info(br, "Multicast hash table "
574 "on fire: %s\n",
575 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000576 err = -EEXIST;
577 goto err;
578 }
579
580 err = br_mdb_rehash(&br->mdb, max, elasticity);
581 if (err) {
stephen hemminger28a16c92010-05-10 09:31:09 +0000582 br_warn(br, "Cannot rehash multicast "
583 "hash table, disabling snooping: %s, %d, %d\n",
584 port ? port->dev->name : br->dev->name,
585 mdb->size, err);
Herbert Xueb1d1642010-02-27 19:41:45 +0000586 goto disable;
587 }
588
589 err = -EAGAIN;
590 goto err;
591 }
592
593 return NULL;
594
595err:
596 mp = ERR_PTR(err);
597 return mp;
598}
599
Cong Wangcfd56752012-12-11 22:23:08 +0000600struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
601 struct net_bridge_port *port, struct br_ip *group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000602{
Eric Dumazete8051682010-11-15 06:38:10 +0000603 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000604 struct net_bridge_mdb_entry *mp;
605 int hash;
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000606 int err;
Herbert Xueb1d1642010-02-27 19:41:45 +0000607
Eric Dumazete8051682010-11-15 06:38:10 +0000608 mdb = rcu_dereference_protected(br->mdb, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000609 if (!mdb) {
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000610 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
611 if (err)
612 return ERR_PTR(err);
Herbert Xueb1d1642010-02-27 19:41:45 +0000613 goto rehash;
614 }
615
616 hash = br_ip_hash(mdb, group);
617 mp = br_multicast_get_group(br, port, group, hash);
618 switch (PTR_ERR(mp)) {
619 case 0:
620 break;
621
622 case -EAGAIN:
623rehash:
Eric Dumazete8051682010-11-15 06:38:10 +0000624 mdb = rcu_dereference_protected(br->mdb, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000625 hash = br_ip_hash(mdb, group);
626 break;
627
628 default:
629 goto out;
630 }
631
632 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
633 if (unlikely(!mp))
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000634 return ERR_PTR(-ENOMEM);
Herbert Xueb1d1642010-02-27 19:41:45 +0000635
636 mp->br = br;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900637 mp->addr = *group;
Eric Dumazet1faabf22013-07-19 20:07:16 -0700638 setup_timer(&mp->timer, br_multicast_group_expired,
639 (unsigned long)mp);
640
Herbert Xueb1d1642010-02-27 19:41:45 +0000641 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
642 mdb->size++;
643
644out:
645 return mp;
646}
647
Cong Wangcfd56752012-12-11 22:23:08 +0000648struct net_bridge_port_group *br_multicast_new_port_group(
649 struct net_bridge_port *port,
650 struct br_ip *group,
Amerigo Wangccb1c312012-12-14 22:09:51 +0000651 struct net_bridge_port_group __rcu *next,
652 unsigned char state)
Cong Wangcfd56752012-12-11 22:23:08 +0000653{
654 struct net_bridge_port_group *p;
655
656 p = kzalloc(sizeof(*p), GFP_ATOMIC);
657 if (unlikely(!p))
658 return NULL;
659
660 p->addr = *group;
661 p->port = port;
Amerigo Wangccb1c312012-12-14 22:09:51 +0000662 p->state = state;
stephen hemmingereca2a432012-12-13 06:51:28 +0000663 rcu_assign_pointer(p->next, next);
Cong Wangcfd56752012-12-11 22:23:08 +0000664 hlist_add_head(&p->mglist, &port->mglist);
665 setup_timer(&p->timer, br_multicast_port_group_expired,
666 (unsigned long)p);
667 return p;
668}
669
Herbert Xueb1d1642010-02-27 19:41:45 +0000670static int br_multicast_add_group(struct net_bridge *br,
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900671 struct net_bridge_port *port,
672 struct br_ip *group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000673{
674 struct net_bridge_mdb_entry *mp;
675 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +0000676 struct net_bridge_port_group __rcu **pp;
Linus Lüssing454594f2013-10-20 00:58:57 +0200677 unsigned long now = jiffies;
Herbert Xueb1d1642010-02-27 19:41:45 +0000678 int err;
679
Herbert Xueb1d1642010-02-27 19:41:45 +0000680 spin_lock(&br->multicast_lock);
681 if (!netif_running(br->dev) ||
682 (port && port->state == BR_STATE_DISABLED))
683 goto out;
684
685 mp = br_multicast_new_group(br, port, group);
686 err = PTR_ERR(mp);
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000687 if (IS_ERR(mp))
Herbert Xueb1d1642010-02-27 19:41:45 +0000688 goto err;
689
690 if (!port) {
Herbert Xu8a870172011-02-12 01:05:42 -0800691 mp->mglist = true;
Linus Lüssing454594f2013-10-20 00:58:57 +0200692 mod_timer(&mp->timer, now + br->multicast_membership_interval);
Herbert Xueb1d1642010-02-27 19:41:45 +0000693 goto out;
694 }
695
Eric Dumazete8051682010-11-15 06:38:10 +0000696 for (pp = &mp->ports;
697 (p = mlock_dereference(*pp, br)) != NULL;
698 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000699 if (p->port == port)
Linus Lüssing454594f2013-10-20 00:58:57 +0200700 goto found;
Herbert Xueb1d1642010-02-27 19:41:45 +0000701 if ((unsigned long)p->port < (unsigned long)port)
702 break;
703 }
704
Amerigo Wangccb1c312012-12-14 22:09:51 +0000705 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
Herbert Xueb1d1642010-02-27 19:41:45 +0000706 if (unlikely(!p))
707 goto err;
Herbert Xueb1d1642010-02-27 19:41:45 +0000708 rcu_assign_pointer(*pp, p);
Nikolay Aleksandrov09cf0212015-07-09 03:11:10 -0700709 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, MDB_TEMPORARY);
Herbert Xueb1d1642010-02-27 19:41:45 +0000710
Linus Lüssing454594f2013-10-20 00:58:57 +0200711found:
712 mod_timer(&p->timer, now + br->multicast_membership_interval);
Herbert Xueb1d1642010-02-27 19:41:45 +0000713out:
714 err = 0;
715
716err:
717 spin_unlock(&br->multicast_lock);
718 return err;
719}
720
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900721static int br_ip4_multicast_add_group(struct net_bridge *br,
722 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000723 __be32 group,
724 __u16 vid)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900725{
726 struct br_ip br_group;
727
728 if (ipv4_is_local_multicast(group))
729 return 0;
730
731 br_group.u.ip4 = group;
732 br_group.proto = htons(ETH_P_IP);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000733 br_group.vid = vid;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900734
735 return br_multicast_add_group(br, port, &br_group);
736}
737
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000738#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900739static int br_ip6_multicast_add_group(struct net_bridge *br,
740 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000741 const struct in6_addr *group,
742 __u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900743{
744 struct br_ip br_group;
745
Linus Lüssing3c3769e2013-09-04 02:13:39 +0200746 if (ipv6_addr_is_ll_all_nodes(group))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900747 return 0;
748
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000749 br_group.u.ip6 = *group;
Linus Lüssing9cc6e0c2011-02-15 13:19:17 +0000750 br_group.proto = htons(ETH_P_IPV6);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000751 br_group.vid = vid;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900752
753 return br_multicast_add_group(br, port, &br_group);
754}
755#endif
756
Herbert Xueb1d1642010-02-27 19:41:45 +0000757static void br_multicast_router_expired(unsigned long data)
758{
759 struct net_bridge_port *port = (void *)data;
760 struct net_bridge *br = port->br;
761
762 spin_lock(&br->multicast_lock);
763 if (port->multicast_router != 1 ||
764 timer_pending(&port->multicast_router_timer) ||
765 hlist_unhashed(&port->rlist))
766 goto out;
767
768 hlist_del_init_rcu(&port->rlist);
Satish Ashok949f1e32015-07-23 05:00:53 -0700769 br_rtr_notify(br->dev, port, RTM_DELMDB);
Herbert Xueb1d1642010-02-27 19:41:45 +0000770
771out:
772 spin_unlock(&br->multicast_lock);
773}
774
775static void br_multicast_local_router_expired(unsigned long data)
776{
777}
778
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200779static void br_multicast_querier_expired(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +0200780 struct bridge_mcast_own_query *query)
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000781{
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000782 spin_lock(&br->multicast_lock);
783 if (!netif_running(br->dev) || br->multicast_disabled)
784 goto out;
785
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200786 br_multicast_start_querier(br, query);
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000787
788out:
789 spin_unlock(&br->multicast_lock);
790}
791
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200792static void br_ip4_multicast_querier_expired(unsigned long data)
793{
794 struct net_bridge *br = (void *)data;
795
Linus Lüssing90010b32014-06-07 18:26:26 +0200796 br_multicast_querier_expired(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200797}
798
799#if IS_ENABLED(CONFIG_IPV6)
800static void br_ip6_multicast_querier_expired(unsigned long data)
801{
802 struct net_bridge *br = (void *)data;
803
Linus Lüssing90010b32014-06-07 18:26:26 +0200804 br_multicast_querier_expired(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200805}
806#endif
807
Linus Lüssingdc4eb532014-06-07 18:26:27 +0200808static void br_multicast_select_own_querier(struct net_bridge *br,
809 struct br_ip *ip,
810 struct sk_buff *skb)
811{
812 if (ip->proto == htons(ETH_P_IP))
813 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
814#if IS_ENABLED(CONFIG_IPV6)
815 else
816 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
817#endif
818}
819
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900820static void __br_multicast_send_query(struct net_bridge *br,
821 struct net_bridge_port *port,
822 struct br_ip *ip)
Herbert Xueb1d1642010-02-27 19:41:45 +0000823{
Herbert Xueb1d1642010-02-27 19:41:45 +0000824 struct sk_buff *skb;
825
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900826 skb = br_multicast_alloc_query(br, ip);
Herbert Xueb1d1642010-02-27 19:41:45 +0000827 if (!skb)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900828 return;
Herbert Xueb1d1642010-02-27 19:41:45 +0000829
830 if (port) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000831 skb->dev = port->dev;
David Miller7026b1d2015-04-05 22:19:04 -0400832 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, NULL, skb,
833 NULL, skb->dev,
Linus Lüssingf0b4eec2014-11-17 12:20:28 +0100834 br_dev_queue_push_xmit);
Linus Lüssingdc4eb532014-06-07 18:26:27 +0200835 } else {
836 br_multicast_select_own_querier(br, ip, skb);
Herbert Xueb1d1642010-02-27 19:41:45 +0000837 netif_rx(skb);
Linus Lüssingdc4eb532014-06-07 18:26:27 +0200838 }
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900839}
Herbert Xueb1d1642010-02-27 19:41:45 +0000840
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900841static void br_multicast_send_query(struct net_bridge *br,
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200842 struct net_bridge_port *port,
Linus Lüssing90010b32014-06-07 18:26:26 +0200843 struct bridge_mcast_own_query *own_query)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900844{
845 unsigned long time;
846 struct br_ip br_group;
Linus Lüssing90010b32014-06-07 18:26:26 +0200847 struct bridge_mcast_other_query *other_query = NULL;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900848
849 if (!netif_running(br->dev) || br->multicast_disabled ||
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200850 !br->multicast_querier)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900851 return;
852
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900853 memset(&br_group.u, 0, sizeof(br_group.u));
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900854
Linus Lüssing90010b32014-06-07 18:26:26 +0200855 if (port ? (own_query == &port->ip4_own_query) :
856 (own_query == &br->ip4_own_query)) {
857 other_query = &br->ip4_other_query;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200858 br_group.proto = htons(ETH_P_IP);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000859#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200860 } else {
Linus Lüssing90010b32014-06-07 18:26:26 +0200861 other_query = &br->ip6_other_query;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200862 br_group.proto = htons(ETH_P_IPV6);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900863#endif
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200864 }
865
Linus Lüssing90010b32014-06-07 18:26:26 +0200866 if (!other_query || timer_pending(&other_query->timer))
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200867 return;
868
869 __br_multicast_send_query(br, port, &br_group);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900870
Herbert Xueb1d1642010-02-27 19:41:45 +0000871 time = jiffies;
Linus Lüssing90010b32014-06-07 18:26:26 +0200872 time += own_query->startup_sent < br->multicast_startup_query_count ?
Herbert Xueb1d1642010-02-27 19:41:45 +0000873 br->multicast_startup_query_interval :
874 br->multicast_query_interval;
Linus Lüssing90010b32014-06-07 18:26:26 +0200875 mod_timer(&own_query->timer, time);
Herbert Xueb1d1642010-02-27 19:41:45 +0000876}
877
Linus Lüssing90010b32014-06-07 18:26:26 +0200878static void
879br_multicast_port_query_expired(struct net_bridge_port *port,
880 struct bridge_mcast_own_query *query)
Herbert Xueb1d1642010-02-27 19:41:45 +0000881{
Herbert Xueb1d1642010-02-27 19:41:45 +0000882 struct net_bridge *br = port->br;
883
884 spin_lock(&br->multicast_lock);
Dan Carpenter02a780c2010-03-06 01:14:09 +0000885 if (port->state == BR_STATE_DISABLED ||
886 port->state == BR_STATE_BLOCKING)
Herbert Xueb1d1642010-02-27 19:41:45 +0000887 goto out;
888
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200889 if (query->startup_sent < br->multicast_startup_query_count)
890 query->startup_sent++;
Herbert Xueb1d1642010-02-27 19:41:45 +0000891
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200892 br_multicast_send_query(port->br, port, query);
Herbert Xueb1d1642010-02-27 19:41:45 +0000893
894out:
895 spin_unlock(&br->multicast_lock);
896}
897
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200898static void br_ip4_multicast_port_query_expired(unsigned long data)
899{
900 struct net_bridge_port *port = (void *)data;
901
Linus Lüssing90010b32014-06-07 18:26:26 +0200902 br_multicast_port_query_expired(port, &port->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200903}
904
905#if IS_ENABLED(CONFIG_IPV6)
906static void br_ip6_multicast_port_query_expired(unsigned long data)
907{
908 struct net_bridge_port *port = (void *)data;
909
Linus Lüssing90010b32014-06-07 18:26:26 +0200910 br_multicast_port_query_expired(port, &port->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200911}
912#endif
913
Herbert Xueb1d1642010-02-27 19:41:45 +0000914void br_multicast_add_port(struct net_bridge_port *port)
915{
916 port->multicast_router = 1;
917
918 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
919 (unsigned long)port);
Linus Lüssing90010b32014-06-07 18:26:26 +0200920 setup_timer(&port->ip4_own_query.timer,
921 br_ip4_multicast_port_query_expired, (unsigned long)port);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200922#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +0200923 setup_timer(&port->ip6_own_query.timer,
924 br_ip6_multicast_port_query_expired, (unsigned long)port);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200925#endif
Herbert Xueb1d1642010-02-27 19:41:45 +0000926}
927
928void br_multicast_del_port(struct net_bridge_port *port)
929{
Satish Ashoke10177a2015-07-15 07:16:51 -0700930 struct net_bridge *br = port->br;
931 struct net_bridge_port_group *pg;
932 struct hlist_node *n;
933
934 /* Take care of the remaining groups, only perm ones should be left */
935 spin_lock_bh(&br->multicast_lock);
936 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
937 br_multicast_del_pg(br, pg);
938 spin_unlock_bh(&br->multicast_lock);
Herbert Xueb1d1642010-02-27 19:41:45 +0000939 del_timer_sync(&port->multicast_router_timer);
940}
941
Linus Lüssing90010b32014-06-07 18:26:26 +0200942static void br_multicast_enable(struct bridge_mcast_own_query *query)
Herbert Xu561f1102010-02-27 19:41:50 +0000943{
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200944 query->startup_sent = 0;
Herbert Xu561f1102010-02-27 19:41:50 +0000945
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200946 if (try_to_del_timer_sync(&query->timer) >= 0 ||
947 del_timer(&query->timer))
948 mod_timer(&query->timer, jiffies);
Herbert Xu561f1102010-02-27 19:41:50 +0000949}
950
Herbert Xueb1d1642010-02-27 19:41:45 +0000951void br_multicast_enable_port(struct net_bridge_port *port)
952{
953 struct net_bridge *br = port->br;
954
955 spin_lock(&br->multicast_lock);
956 if (br->multicast_disabled || !netif_running(br->dev))
957 goto out;
958
Linus Lüssing90010b32014-06-07 18:26:26 +0200959 br_multicast_enable(&port->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200960#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +0200961 br_multicast_enable(&port->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200962#endif
Satish Ashok754bc542015-06-19 01:22:57 -0700963 if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
964 br_multicast_add_router(br, port);
Herbert Xueb1d1642010-02-27 19:41:45 +0000965
966out:
967 spin_unlock(&br->multicast_lock);
968}
969
970void br_multicast_disable_port(struct net_bridge_port *port)
971{
972 struct net_bridge *br = port->br;
973 struct net_bridge_port_group *pg;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800974 struct hlist_node *n;
Herbert Xueb1d1642010-02-27 19:41:45 +0000975
976 spin_lock(&br->multicast_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800977 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
Satish Ashoke10177a2015-07-15 07:16:51 -0700978 if (pg->state == MDB_TEMPORARY)
979 br_multicast_del_pg(br, pg);
Herbert Xueb1d1642010-02-27 19:41:45 +0000980
Satish Ashok949f1e32015-07-23 05:00:53 -0700981 if (!hlist_unhashed(&port->rlist)) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000982 hlist_del_init_rcu(&port->rlist);
Satish Ashok949f1e32015-07-23 05:00:53 -0700983 br_rtr_notify(br->dev, port, RTM_DELMDB);
984 }
Herbert Xueb1d1642010-02-27 19:41:45 +0000985 del_timer(&port->multicast_router_timer);
Linus Lüssing90010b32014-06-07 18:26:26 +0200986 del_timer(&port->ip4_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200987#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +0200988 del_timer(&port->ip6_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200989#endif
Herbert Xueb1d1642010-02-27 19:41:45 +0000990 spin_unlock(&br->multicast_lock);
991}
992
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900993static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
994 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -0400995 struct sk_buff *skb,
996 u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +0000997{
998 struct igmpv3_report *ih;
999 struct igmpv3_grec *grec;
1000 int i;
1001 int len;
1002 int num;
1003 int type;
1004 int err = 0;
1005 __be32 group;
1006
Herbert Xueb1d1642010-02-27 19:41:45 +00001007 ih = igmpv3_report_hdr(skb);
1008 num = ntohs(ih->ngrec);
1009 len = sizeof(*ih);
1010
1011 for (i = 0; i < num; i++) {
1012 len += sizeof(*grec);
1013 if (!pskb_may_pull(skb, len))
1014 return -EINVAL;
1015
Herbert Xufd218cf2010-04-07 21:20:47 -07001016 grec = (void *)(skb->data + len - sizeof(*grec));
Herbert Xueb1d1642010-02-27 19:41:45 +00001017 group = grec->grec_mca;
1018 type = grec->grec_type;
1019
Eric Dumazet8eabf952010-04-20 03:20:05 +00001020 len += ntohs(grec->grec_nsrcs) * 4;
Herbert Xueb1d1642010-02-27 19:41:45 +00001021 if (!pskb_may_pull(skb, len))
1022 return -EINVAL;
1023
1024 /* We treat this as an IGMPv2 report for now. */
1025 switch (type) {
1026 case IGMPV3_MODE_IS_INCLUDE:
1027 case IGMPV3_MODE_IS_EXCLUDE:
1028 case IGMPV3_CHANGE_TO_INCLUDE:
1029 case IGMPV3_CHANGE_TO_EXCLUDE:
1030 case IGMPV3_ALLOW_NEW_SOURCES:
1031 case IGMPV3_BLOCK_OLD_SOURCES:
1032 break;
1033
1034 default:
1035 continue;
1036 }
1037
Satish Ashokbc8c20a2015-07-13 05:28:37 -07001038 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1039 type == IGMPV3_MODE_IS_INCLUDE) &&
1040 ntohs(grec->grec_nsrcs) == 0) {
1041 br_ip4_multicast_leave_group(br, port, group, vid);
1042 } else {
1043 err = br_ip4_multicast_add_group(br, port, group, vid);
1044 if (err)
1045 break;
1046 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001047 }
1048
1049 return err;
1050}
1051
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001052#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001053static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1054 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001055 struct sk_buff *skb,
1056 u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001057{
1058 struct icmp6hdr *icmp6h;
1059 struct mld2_grec *grec;
1060 int i;
1061 int len;
1062 int num;
1063 int err = 0;
1064
1065 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1066 return -EINVAL;
1067
1068 icmp6h = icmp6_hdr(skb);
1069 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1070 len = sizeof(*icmp6h);
1071
1072 for (i = 0; i < num; i++) {
1073 __be16 *nsrcs, _nsrcs;
1074
1075 nsrcs = skb_header_pointer(skb,
1076 len + offsetof(struct mld2_grec,
Linus Lüssing649e9842011-02-15 13:19:18 +00001077 grec_nsrcs),
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001078 sizeof(_nsrcs), &_nsrcs);
1079 if (!nsrcs)
1080 return -EINVAL;
1081
1082 if (!pskb_may_pull(skb,
1083 len + sizeof(*grec) +
Linus Lüssingd41db9f2011-02-15 13:19:19 +00001084 sizeof(struct in6_addr) * ntohs(*nsrcs)))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001085 return -EINVAL;
1086
1087 grec = (struct mld2_grec *)(skb->data + len);
Linus Lüssingd41db9f2011-02-15 13:19:19 +00001088 len += sizeof(*grec) +
1089 sizeof(struct in6_addr) * ntohs(*nsrcs);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001090
1091 /* We treat these as MLDv1 reports for now. */
1092 switch (grec->grec_type) {
1093 case MLD2_MODE_IS_INCLUDE:
1094 case MLD2_MODE_IS_EXCLUDE:
1095 case MLD2_CHANGE_TO_INCLUDE:
1096 case MLD2_CHANGE_TO_EXCLUDE:
1097 case MLD2_ALLOW_NEW_SOURCES:
1098 case MLD2_BLOCK_OLD_SOURCES:
1099 break;
1100
1101 default:
1102 continue;
1103 }
1104
Satish Ashokbc8c20a2015-07-13 05:28:37 -07001105 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1106 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1107 ntohs(*nsrcs) == 0) {
1108 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1109 vid);
1110 } else {
1111 err = br_ip6_multicast_add_group(br, port,
1112 &grec->grec_mca, vid);
1113 if (!err)
1114 break;
1115 }
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001116 }
1117
1118 return err;
1119}
1120#endif
1121
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001122static bool br_ip4_multicast_select_querier(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001123 struct net_bridge_port *port,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001124 __be32 saddr)
1125{
1126 if (!timer_pending(&br->ip4_own_query.timer) &&
1127 !timer_pending(&br->ip4_other_query.timer))
1128 goto update;
1129
1130 if (!br->ip4_querier.addr.u.ip4)
1131 goto update;
1132
1133 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1134 goto update;
1135
1136 return false;
1137
1138update:
1139 br->ip4_querier.addr.u.ip4 = saddr;
1140
Linus Lüssing2cd41432014-06-07 18:26:29 +02001141 /* update protected by general multicast_lock by caller */
1142 rcu_assign_pointer(br->ip4_querier.port, port);
1143
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001144 return true;
1145}
1146
1147#if IS_ENABLED(CONFIG_IPV6)
1148static bool br_ip6_multicast_select_querier(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001149 struct net_bridge_port *port,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001150 struct in6_addr *saddr)
1151{
1152 if (!timer_pending(&br->ip6_own_query.timer) &&
1153 !timer_pending(&br->ip6_other_query.timer))
1154 goto update;
1155
1156 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1157 goto update;
1158
1159 return false;
1160
1161update:
1162 br->ip6_querier.addr.u.ip6 = *saddr;
1163
Linus Lüssing2cd41432014-06-07 18:26:29 +02001164 /* update protected by general multicast_lock by caller */
1165 rcu_assign_pointer(br->ip6_querier.port, port);
1166
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001167 return true;
1168}
1169#endif
1170
1171static bool br_multicast_select_querier(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001172 struct net_bridge_port *port,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001173 struct br_ip *saddr)
1174{
1175 switch (saddr->proto) {
1176 case htons(ETH_P_IP):
Linus Lüssing2cd41432014-06-07 18:26:29 +02001177 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001178#if IS_ENABLED(CONFIG_IPV6)
1179 case htons(ETH_P_IPV6):
Linus Lüssing2cd41432014-06-07 18:26:29 +02001180 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001181#endif
1182 }
1183
1184 return false;
1185}
1186
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001187static void
Linus Lüssing90010b32014-06-07 18:26:26 +02001188br_multicast_update_query_timer(struct net_bridge *br,
1189 struct bridge_mcast_other_query *query,
1190 unsigned long max_delay)
Linus Lüssingb00589a2013-08-01 01:06:20 +02001191{
Linus Lüssing90010b32014-06-07 18:26:26 +02001192 if (!timer_pending(&query->timer))
1193 query->delay_time = jiffies + max_delay;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001194
Linus Lüssing90010b32014-06-07 18:26:26 +02001195 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
Linus Lüssingb00589a2013-08-01 01:06:20 +02001196}
1197
stephen hemminger7e80c122010-04-27 15:01:04 +00001198/*
Cong Wang7c776022013-06-21 15:37:25 +08001199 * Add port to router_list
stephen hemminger7e80c122010-04-27 15:01:04 +00001200 * list is maintained ordered by pointer value
1201 * and locked by br->multicast_lock and RCU
1202 */
Herbert Xu0909e112010-02-27 19:41:49 +00001203static void br_multicast_add_router(struct net_bridge *br,
1204 struct net_bridge_port *port)
1205{
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001206 struct net_bridge_port *p;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001207 struct hlist_node *slot = NULL;
Herbert Xu0909e112010-02-27 19:41:49 +00001208
Nikolay Aleksandrov1a040ea2015-06-09 10:23:57 -07001209 if (!hlist_unhashed(&port->rlist))
1210 return;
1211
Sasha Levinb67bfe02013-02-27 17:06:00 -08001212 hlist_for_each_entry(p, &br->router_list, rlist) {
stephen hemminger7e80c122010-04-27 15:01:04 +00001213 if ((unsigned long) port >= (unsigned long) p)
1214 break;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001215 slot = &p->rlist;
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001216 }
Herbert Xu0909e112010-02-27 19:41:49 +00001217
stephen hemminger7e80c122010-04-27 15:01:04 +00001218 if (slot)
Ken Helias1d023282014-08-06 16:09:16 -07001219 hlist_add_behind_rcu(&port->rlist, slot);
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001220 else
1221 hlist_add_head_rcu(&port->rlist, &br->router_list);
Satish Ashok949f1e32015-07-23 05:00:53 -07001222 br_rtr_notify(br->dev, port, RTM_NEWMDB);
Herbert Xu0909e112010-02-27 19:41:49 +00001223}
1224
Herbert Xueb1d1642010-02-27 19:41:45 +00001225static void br_multicast_mark_router(struct net_bridge *br,
1226 struct net_bridge_port *port)
1227{
1228 unsigned long now = jiffies;
Herbert Xueb1d1642010-02-27 19:41:45 +00001229
1230 if (!port) {
1231 if (br->multicast_router == 1)
1232 mod_timer(&br->multicast_router_timer,
1233 now + br->multicast_querier_interval);
1234 return;
1235 }
1236
1237 if (port->multicast_router != 1)
1238 return;
1239
Herbert Xu0909e112010-02-27 19:41:49 +00001240 br_multicast_add_router(br, port);
Herbert Xueb1d1642010-02-27 19:41:45 +00001241
Herbert Xueb1d1642010-02-27 19:41:45 +00001242 mod_timer(&port->multicast_router_timer,
1243 now + br->multicast_querier_interval);
1244}
1245
1246static void br_multicast_query_received(struct net_bridge *br,
1247 struct net_bridge_port *port,
Linus Lüssing90010b32014-06-07 18:26:26 +02001248 struct bridge_mcast_other_query *query,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001249 struct br_ip *saddr,
Linus Lüssingb00589a2013-08-01 01:06:20 +02001250 unsigned long max_delay)
Herbert Xueb1d1642010-02-27 19:41:45 +00001251{
Linus Lüssing2cd41432014-06-07 18:26:29 +02001252 if (!br_multicast_select_querier(br, port, saddr))
Herbert Xueb1d1642010-02-27 19:41:45 +00001253 return;
1254
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001255 br_multicast_update_query_timer(br, query, max_delay);
Herbert Xueb1d1642010-02-27 19:41:45 +00001256 br_multicast_mark_router(br, port);
1257}
1258
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001259static int br_ip4_multicast_query(struct net_bridge *br,
1260 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001261 struct sk_buff *skb,
1262 u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +00001263{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001264 const struct iphdr *iph = ip_hdr(skb);
Herbert Xueb1d1642010-02-27 19:41:45 +00001265 struct igmphdr *ih = igmp_hdr(skb);
1266 struct net_bridge_mdb_entry *mp;
1267 struct igmpv3_query *ih3;
1268 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +00001269 struct net_bridge_port_group __rcu **pp;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001270 struct br_ip saddr;
Herbert Xueb1d1642010-02-27 19:41:45 +00001271 unsigned long max_delay;
1272 unsigned long now = jiffies;
1273 __be32 group;
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001274 int err = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001275
1276 spin_lock(&br->multicast_lock);
1277 if (!netif_running(br->dev) ||
1278 (port && port->state == BR_STATE_DISABLED))
1279 goto out;
1280
Herbert Xueb1d1642010-02-27 19:41:45 +00001281 group = ih->group;
1282
1283 if (skb->len == sizeof(*ih)) {
1284 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1285
1286 if (!max_delay) {
1287 max_delay = 10 * HZ;
1288 group = 0;
1289 }
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001290 } else if (skb->len >= sizeof(*ih3)) {
Herbert Xueb1d1642010-02-27 19:41:45 +00001291 ih3 = igmpv3_query_hdr(skb);
1292 if (ih3->nsrcs)
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001293 goto out;
Herbert Xueb1d1642010-02-27 19:41:45 +00001294
YOSHIFUJI Hideaki / 吉藤英明0ba8c9e2010-03-15 19:27:00 +00001295 max_delay = ih3->code ?
1296 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001297 } else {
Linus Lüssing9ed973c2014-03-10 22:25:24 +01001298 goto out;
1299 }
1300
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001301 if (!group) {
1302 saddr.proto = htons(ETH_P_IP);
1303 saddr.u.ip4 = iph->saddr;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001304
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001305 br_multicast_query_received(br, port, &br->ip4_other_query,
1306 &saddr, max_delay);
Herbert Xueb1d1642010-02-27 19:41:45 +00001307 goto out;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001308 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001309
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001310 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001311 if (!mp)
1312 goto out;
1313
1314 max_delay *= br->multicast_last_member_count;
1315
Herbert Xu8a870172011-02-12 01:05:42 -08001316 if (mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +00001317 (timer_pending(&mp->timer) ?
1318 time_after(mp->timer.expires, now + max_delay) :
1319 try_to_del_timer_sync(&mp->timer) >= 0))
1320 mod_timer(&mp->timer, now + max_delay);
1321
Eric Dumazete8051682010-11-15 06:38:10 +00001322 for (pp = &mp->ports;
1323 (p = mlock_dereference(*pp, br)) != NULL;
1324 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +00001325 if (timer_pending(&p->timer) ?
1326 time_after(p->timer.expires, now + max_delay) :
1327 try_to_del_timer_sync(&p->timer) >= 0)
Herbert Xu24f9cdc2011-02-11 12:42:07 +00001328 mod_timer(&p->timer, now + max_delay);
Herbert Xueb1d1642010-02-27 19:41:45 +00001329 }
1330
1331out:
1332 spin_unlock(&br->multicast_lock);
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001333 return err;
Herbert Xueb1d1642010-02-27 19:41:45 +00001334}
1335
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001336#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001337static int br_ip6_multicast_query(struct net_bridge *br,
1338 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001339 struct sk_buff *skb,
1340 u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001341{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001342 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
stephen hemmingereca2a432012-12-13 06:51:28 +00001343 struct mld_msg *mld;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001344 struct net_bridge_mdb_entry *mp;
1345 struct mld2_query *mld2q;
Eric Dumazete8051682010-11-15 06:38:10 +00001346 struct net_bridge_port_group *p;
1347 struct net_bridge_port_group __rcu **pp;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001348 struct br_ip saddr;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001349 unsigned long max_delay;
1350 unsigned long now = jiffies;
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001351 const struct in6_addr *group = NULL;
Linus Lüssing9ed973c2014-03-10 22:25:24 +01001352 bool is_general_query;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001353 int err = 0;
1354
1355 spin_lock(&br->multicast_lock);
1356 if (!netif_running(br->dev) ||
1357 (port && port->state == BR_STATE_DISABLED))
1358 goto out;
1359
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001360 if (skb->len == sizeof(*mld)) {
1361 if (!pskb_may_pull(skb, sizeof(*mld))) {
1362 err = -EINVAL;
1363 goto out;
1364 }
1365 mld = (struct mld_msg *) icmp6_hdr(skb);
Li RongQing47152132012-07-09 23:56:12 +00001366 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001367 if (max_delay)
1368 group = &mld->mld_mca;
Linus Lüssing248ba8e2013-08-06 00:32:05 +02001369 } else {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001370 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1371 err = -EINVAL;
1372 goto out;
1373 }
1374 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1375 if (!mld2q->mld2q_nsrcs)
1376 group = &mld2q->mld2q_mca;
Daniel Borkmanne3f5b172013-09-04 00:19:39 +02001377
1378 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001379 }
1380
Linus Lüssing9ed973c2014-03-10 22:25:24 +01001381 is_general_query = group && ipv6_addr_any(group);
1382
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001383 if (is_general_query) {
1384 saddr.proto = htons(ETH_P_IPV6);
1385 saddr.u.ip6 = ip6h->saddr;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001386
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001387 br_multicast_query_received(br, port, &br->ip6_other_query,
1388 &saddr, max_delay);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001389 goto out;
Linus Lüssing6c03ee82014-06-12 01:41:23 +02001390 } else if (!group) {
1391 goto out;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001392 }
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001393
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001394 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001395 if (!mp)
1396 goto out;
1397
1398 max_delay *= br->multicast_last_member_count;
Herbert Xu8a870172011-02-12 01:05:42 -08001399 if (mp->mglist &&
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001400 (timer_pending(&mp->timer) ?
1401 time_after(mp->timer.expires, now + max_delay) :
1402 try_to_del_timer_sync(&mp->timer) >= 0))
1403 mod_timer(&mp->timer, now + max_delay);
1404
Eric Dumazete8051682010-11-15 06:38:10 +00001405 for (pp = &mp->ports;
1406 (p = mlock_dereference(*pp, br)) != NULL;
1407 pp = &p->next) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001408 if (timer_pending(&p->timer) ?
1409 time_after(p->timer.expires, now + max_delay) :
1410 try_to_del_timer_sync(&p->timer) >= 0)
Herbert Xu24f9cdc2011-02-11 12:42:07 +00001411 mod_timer(&p->timer, now + max_delay);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001412 }
1413
1414out:
1415 spin_unlock(&br->multicast_lock);
1416 return err;
1417}
1418#endif
1419
Linus Lüssing90010b32014-06-07 18:26:26 +02001420static void
1421br_multicast_leave_group(struct net_bridge *br,
1422 struct net_bridge_port *port,
1423 struct br_ip *group,
1424 struct bridge_mcast_other_query *other_query,
1425 struct bridge_mcast_own_query *own_query)
Herbert Xueb1d1642010-02-27 19:41:45 +00001426{
1427 struct net_bridge_mdb_htable *mdb;
1428 struct net_bridge_mdb_entry *mp;
1429 struct net_bridge_port_group *p;
1430 unsigned long now;
1431 unsigned long time;
1432
Herbert Xueb1d1642010-02-27 19:41:45 +00001433 spin_lock(&br->multicast_lock);
1434 if (!netif_running(br->dev) ||
Satish Ashok544586f2015-07-28 03:28:27 -07001435 (port && port->state == BR_STATE_DISABLED))
Herbert Xueb1d1642010-02-27 19:41:45 +00001436 goto out;
1437
Eric Dumazete8051682010-11-15 06:38:10 +00001438 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +00001439 mp = br_mdb_ip_get(mdb, group);
1440 if (!mp)
1441 goto out;
1442
Satish Ashok544586f2015-07-28 03:28:27 -07001443 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1444 struct net_bridge_port_group __rcu **pp;
1445
1446 for (pp = &mp->ports;
1447 (p = mlock_dereference(*pp, br)) != NULL;
1448 pp = &p->next) {
1449 if (p->port != port)
1450 continue;
1451
1452 rcu_assign_pointer(*pp, p->next);
1453 hlist_del_init(&p->mglist);
1454 del_timer(&p->timer);
1455 call_rcu_bh(&p->rcu, br_multicast_free_pg);
David S. Miller5510b3c2015-07-31 23:52:20 -07001456 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1457 p->state);
Satish Ashok544586f2015-07-28 03:28:27 -07001458
1459 if (!mp->ports && !mp->mglist &&
1460 netif_running(br->dev))
1461 mod_timer(&mp->timer, jiffies);
1462 }
1463 goto out;
1464 }
1465
1466 if (timer_pending(&other_query->timer))
1467 goto out;
1468
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001469 if (br->multicast_querier) {
Cong Wang6b7df112013-05-21 21:52:56 +00001470 __br_multicast_send_query(br, port, &mp->addr);
1471
1472 time = jiffies + br->multicast_last_member_count *
1473 br->multicast_last_member_interval;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001474
Linus Lüssing90010b32014-06-07 18:26:26 +02001475 mod_timer(&own_query->timer, time);
Cong Wang6b7df112013-05-21 21:52:56 +00001476
1477 for (p = mlock_dereference(mp->ports, br);
1478 p != NULL;
1479 p = mlock_dereference(p->next, br)) {
1480 if (p->port != port)
1481 continue;
1482
1483 if (!hlist_unhashed(&p->mglist) &&
1484 (timer_pending(&p->timer) ?
1485 time_after(p->timer.expires, time) :
1486 try_to_del_timer_sync(&p->timer) >= 0)) {
1487 mod_timer(&p->timer, time);
1488 }
1489
1490 break;
1491 }
1492 }
1493
Herbert Xueb1d1642010-02-27 19:41:45 +00001494 now = jiffies;
1495 time = now + br->multicast_last_member_count *
1496 br->multicast_last_member_interval;
1497
1498 if (!port) {
Linus Lüssing454594f2013-10-20 00:58:57 +02001499 if (mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +00001500 (timer_pending(&mp->timer) ?
1501 time_after(mp->timer.expires, time) :
1502 try_to_del_timer_sync(&mp->timer) >= 0)) {
1503 mod_timer(&mp->timer, time);
Herbert Xueb1d1642010-02-27 19:41:45 +00001504 }
Linus Lüssing454594f2013-10-20 00:58:57 +02001505
1506 goto out;
1507 }
1508
1509 for (p = mlock_dereference(mp->ports, br);
1510 p != NULL;
1511 p = mlock_dereference(p->next, br)) {
1512 if (p->port != port)
1513 continue;
1514
1515 if (!hlist_unhashed(&p->mglist) &&
1516 (timer_pending(&p->timer) ?
1517 time_after(p->timer.expires, time) :
1518 try_to_del_timer_sync(&p->timer) >= 0)) {
1519 mod_timer(&p->timer, time);
1520 }
1521
1522 break;
Herbert Xueb1d1642010-02-27 19:41:45 +00001523 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001524out:
1525 spin_unlock(&br->multicast_lock);
1526}
1527
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001528static void br_ip4_multicast_leave_group(struct net_bridge *br,
1529 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001530 __be32 group,
1531 __u16 vid)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001532{
1533 struct br_ip br_group;
Linus Lüssing90010b32014-06-07 18:26:26 +02001534 struct bridge_mcast_own_query *own_query;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001535
1536 if (ipv4_is_local_multicast(group))
1537 return;
1538
Linus Lüssing90010b32014-06-07 18:26:26 +02001539 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1540
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001541 br_group.u.ip4 = group;
1542 br_group.proto = htons(ETH_P_IP);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001543 br_group.vid = vid;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001544
Linus Lüssing90010b32014-06-07 18:26:26 +02001545 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1546 own_query);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001547}
1548
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001549#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001550static void br_ip6_multicast_leave_group(struct net_bridge *br,
1551 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001552 const struct in6_addr *group,
1553 __u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001554{
1555 struct br_ip br_group;
Linus Lüssing90010b32014-06-07 18:26:26 +02001556 struct bridge_mcast_own_query *own_query;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001557
Linus Lüssing3c3769e2013-09-04 02:13:39 +02001558 if (ipv6_addr_is_ll_all_nodes(group))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001559 return;
1560
Linus Lüssing90010b32014-06-07 18:26:26 +02001561 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1562
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001563 br_group.u.ip6 = *group;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001564 br_group.proto = htons(ETH_P_IPV6);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001565 br_group.vid = vid;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001566
Linus Lüssing90010b32014-06-07 18:26:26 +02001567 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1568 own_query);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001569}
1570#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001571
Herbert Xueb1d1642010-02-27 19:41:45 +00001572static int br_multicast_ipv4_rcv(struct net_bridge *br,
1573 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001574 struct sk_buff *skb,
1575 u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +00001576{
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001577 struct sk_buff *skb_trimmed = NULL;
Herbert Xueb1d1642010-02-27 19:41:45 +00001578 struct igmphdr *ih;
Herbert Xueb1d1642010-02-27 19:41:45 +00001579 int err;
1580
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001581 err = ip_mc_check_igmp(skb, &skb_trimmed);
Herbert Xueb1d1642010-02-27 19:41:45 +00001582
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001583 if (err == -ENOMSG) {
1584 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
Herbert Xubd4265f2011-06-23 02:39:12 +00001585 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Herbert Xueb1d1642010-02-27 19:41:45 +00001586 return 0;
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001587 } else if (err < 0) {
1588 return err;
Herbert Xubd4265f2011-06-23 02:39:12 +00001589 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001590
Herbert Xueb1d1642010-02-27 19:41:45 +00001591 BR_INPUT_SKB_CB(skb)->igmp = 1;
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001592 ih = igmp_hdr(skb);
Herbert Xueb1d1642010-02-27 19:41:45 +00001593
1594 switch (ih->type) {
1595 case IGMP_HOST_MEMBERSHIP_REPORT:
1596 case IGMPV2_HOST_MEMBERSHIP_REPORT:
Fernando Luis Vázquez Cao62b2bcb2011-06-13 15:04:43 +00001597 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001598 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001599 break;
1600 case IGMPV3_HOST_MEMBERSHIP_REPORT:
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001601 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001602 break;
1603 case IGMP_HOST_MEMBERSHIP_QUERY:
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001604 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001605 break;
1606 case IGMP_HOST_LEAVE_MESSAGE:
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001607 br_ip4_multicast_leave_group(br, port, ih->group, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001608 break;
1609 }
1610
Linus Lüssinga5169932015-08-13 05:54:07 +02001611 if (skb_trimmed && skb_trimmed != skb)
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001612 kfree_skb(skb_trimmed);
1613
Herbert Xueb1d1642010-02-27 19:41:45 +00001614 return err;
1615}
1616
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001617#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001618static int br_multicast_ipv6_rcv(struct net_bridge *br,
1619 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001620 struct sk_buff *skb,
1621 u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001622{
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001623 struct sk_buff *skb_trimmed = NULL;
1624 struct mld_msg *mld;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001625 int err;
1626
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001627 err = ipv6_mc_check_mld(skb, &skb_trimmed);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001628
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001629 if (err == -ENOMSG) {
1630 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1631 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Linus Lüssing8fad9c392013-09-04 02:13:38 +02001632 return 0;
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001633 } else if (err < 0) {
1634 return err;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001635 }
1636
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001637 BR_INPUT_SKB_CB(skb)->igmp = 1;
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001638 mld = (struct mld_msg *)skb_transport_header(skb);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001639
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001640 switch (mld->mld_type) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001641 case ICMPV6_MGM_REPORT:
Fernando Luis Vázquez Caofc2af6c2011-06-13 15:06:58 +00001642 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001643 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001644 break;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001645 case ICMPV6_MLD2_REPORT:
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001646 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001647 break;
1648 case ICMPV6_MGM_QUERY:
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001649 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001650 break;
1651 case ICMPV6_MGM_REDUCTION:
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001652 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001653 break;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001654 }
1655
Linus Lüssinga5169932015-08-13 05:54:07 +02001656 if (skb_trimmed && skb_trimmed != skb)
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001657 kfree_skb(skb_trimmed);
1658
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001659 return err;
1660}
1661#endif
1662
Herbert Xueb1d1642010-02-27 19:41:45 +00001663int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001664 struct sk_buff *skb, u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +00001665{
YOSHIFUJI Hideaki / 吉藤英明1fafc7a2010-04-25 08:06:40 +00001666 BR_INPUT_SKB_CB(skb)->igmp = 0;
1667 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1668
Herbert Xueb1d1642010-02-27 19:41:45 +00001669 if (br->multicast_disabled)
1670 return 0;
1671
1672 switch (skb->protocol) {
1673 case htons(ETH_P_IP):
Vlad Yasevich06499092013-10-28 15:45:07 -04001674 return br_multicast_ipv4_rcv(br, port, skb, vid);
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001675#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001676 case htons(ETH_P_IPV6):
Vlad Yasevich06499092013-10-28 15:45:07 -04001677 return br_multicast_ipv6_rcv(br, port, skb, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001678#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001679 }
1680
1681 return 0;
1682}
1683
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001684static void br_multicast_query_expired(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001685 struct bridge_mcast_own_query *query,
1686 struct bridge_mcast_querier *querier)
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001687{
1688 spin_lock(&br->multicast_lock);
1689 if (query->startup_sent < br->multicast_startup_query_count)
1690 query->startup_sent++;
1691
Eric Dumazet71d9f612015-05-28 04:42:54 -07001692 RCU_INIT_POINTER(querier->port, NULL);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001693 br_multicast_send_query(br, NULL, query);
1694 spin_unlock(&br->multicast_lock);
1695}
1696
1697static void br_ip4_multicast_query_expired(unsigned long data)
Herbert Xueb1d1642010-02-27 19:41:45 +00001698{
1699 struct net_bridge *br = (void *)data;
1700
Linus Lüssing2cd41432014-06-07 18:26:29 +02001701 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
Herbert Xueb1d1642010-02-27 19:41:45 +00001702}
1703
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001704#if IS_ENABLED(CONFIG_IPV6)
1705static void br_ip6_multicast_query_expired(unsigned long data)
1706{
1707 struct net_bridge *br = (void *)data;
1708
Linus Lüssing2cd41432014-06-07 18:26:29 +02001709 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001710}
1711#endif
1712
Herbert Xueb1d1642010-02-27 19:41:45 +00001713void br_multicast_init(struct net_bridge *br)
1714{
1715 br->hash_elasticity = 4;
1716 br->hash_max = 512;
1717
1718 br->multicast_router = 1;
Herbert Xuc5c23262012-04-13 02:37:42 +00001719 br->multicast_querier = 0;
Cong Wang1c8ad5b2013-05-21 21:52:54 +00001720 br->multicast_query_use_ifaddr = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001721 br->multicast_last_member_count = 2;
1722 br->multicast_startup_query_count = 2;
1723
1724 br->multicast_last_member_interval = HZ;
1725 br->multicast_query_response_interval = 10 * HZ;
1726 br->multicast_startup_query_interval = 125 * HZ / 4;
1727 br->multicast_query_interval = 125 * HZ;
1728 br->multicast_querier_interval = 255 * HZ;
1729 br->multicast_membership_interval = 260 * HZ;
1730
Linus Lüssing90010b32014-06-07 18:26:26 +02001731 br->ip4_other_query.delay_time = 0;
Linus Lüssing2cd41432014-06-07 18:26:29 +02001732 br->ip4_querier.port = NULL;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001733#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001734 br->ip6_other_query.delay_time = 0;
Linus Lüssing2cd41432014-06-07 18:26:29 +02001735 br->ip6_querier.port = NULL;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001736#endif
Linus Lüssingb00589a2013-08-01 01:06:20 +02001737
Herbert Xueb1d1642010-02-27 19:41:45 +00001738 spin_lock_init(&br->multicast_lock);
1739 setup_timer(&br->multicast_router_timer,
1740 br_multicast_local_router_expired, 0);
Linus Lüssing90010b32014-06-07 18:26:26 +02001741 setup_timer(&br->ip4_other_query.timer,
1742 br_ip4_multicast_querier_expired, (unsigned long)br);
1743 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001744 (unsigned long)br);
1745#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001746 setup_timer(&br->ip6_other_query.timer,
1747 br_ip6_multicast_querier_expired, (unsigned long)br);
1748 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001749 (unsigned long)br);
1750#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001751}
1752
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001753static void __br_multicast_open(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +02001754 struct bridge_mcast_own_query *query)
Herbert Xueb1d1642010-02-27 19:41:45 +00001755{
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001756 query->startup_sent = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001757
1758 if (br->multicast_disabled)
1759 return;
1760
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001761 mod_timer(&query->timer, jiffies);
1762}
1763
1764void br_multicast_open(struct net_bridge *br)
1765{
Linus Lüssing90010b32014-06-07 18:26:26 +02001766 __br_multicast_open(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001767#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001768 __br_multicast_open(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001769#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001770}
1771
1772void br_multicast_stop(struct net_bridge *br)
1773{
Herbert Xueb1d1642010-02-27 19:41:45 +00001774 del_timer_sync(&br->multicast_router_timer);
Linus Lüssing90010b32014-06-07 18:26:26 +02001775 del_timer_sync(&br->ip4_other_query.timer);
1776 del_timer_sync(&br->ip4_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001777#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001778 del_timer_sync(&br->ip6_other_query.timer);
1779 del_timer_sync(&br->ip6_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001780#endif
Satish Ashoke10177a2015-07-15 07:16:51 -07001781}
1782
1783void br_multicast_dev_del(struct net_bridge *br)
1784{
1785 struct net_bridge_mdb_htable *mdb;
1786 struct net_bridge_mdb_entry *mp;
1787 struct hlist_node *n;
1788 u32 ver;
1789 int i;
Herbert Xueb1d1642010-02-27 19:41:45 +00001790
1791 spin_lock_bh(&br->multicast_lock);
Eric Dumazete8051682010-11-15 06:38:10 +00001792 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +00001793 if (!mdb)
1794 goto out;
1795
1796 br->mdb = NULL;
1797
1798 ver = mdb->ver;
1799 for (i = 0; i < mdb->max; i++) {
Sasha Levinb67bfe02013-02-27 17:06:00 -08001800 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
Herbert Xueb1d1642010-02-27 19:41:45 +00001801 hlist[ver]) {
1802 del_timer(&mp->timer);
Herbert Xueb1d1642010-02-27 19:41:45 +00001803 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1804 }
1805 }
1806
1807 if (mdb->old) {
1808 spin_unlock_bh(&br->multicast_lock);
Herbert Xu10cc2b52010-03-05 21:03:35 +00001809 rcu_barrier_bh();
Herbert Xueb1d1642010-02-27 19:41:45 +00001810 spin_lock_bh(&br->multicast_lock);
1811 WARN_ON(mdb->old);
1812 }
1813
1814 mdb->old = mdb;
1815 call_rcu_bh(&mdb->rcu, br_mdb_free);
1816
1817out:
1818 spin_unlock_bh(&br->multicast_lock);
1819}
Herbert Xu0909e112010-02-27 19:41:49 +00001820
1821int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1822{
Linus Lüssing6ae4ae82015-05-23 03:12:34 +02001823 int err = -EINVAL;
Herbert Xu0909e112010-02-27 19:41:49 +00001824
1825 spin_lock_bh(&br->multicast_lock);
Herbert Xu0909e112010-02-27 19:41:49 +00001826
1827 switch (val) {
1828 case 0:
1829 case 2:
1830 del_timer(&br->multicast_router_timer);
1831 /* fall through */
1832 case 1:
1833 br->multicast_router = val;
1834 err = 0;
1835 break;
Herbert Xu0909e112010-02-27 19:41:49 +00001836 }
1837
Herbert Xu0909e112010-02-27 19:41:49 +00001838 spin_unlock_bh(&br->multicast_lock);
1839
1840 return err;
1841}
1842
1843int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1844{
1845 struct net_bridge *br = p->br;
Linus Lüssing6ae4ae82015-05-23 03:12:34 +02001846 int err = -EINVAL;
Herbert Xu0909e112010-02-27 19:41:49 +00001847
1848 spin_lock(&br->multicast_lock);
Herbert Xu0909e112010-02-27 19:41:49 +00001849
1850 switch (val) {
1851 case 0:
1852 case 1:
1853 case 2:
1854 p->multicast_router = val;
1855 err = 0;
1856
Satish Ashok949f1e32015-07-23 05:00:53 -07001857 if (val < 2 && !hlist_unhashed(&p->rlist)) {
Herbert Xu0909e112010-02-27 19:41:49 +00001858 hlist_del_init_rcu(&p->rlist);
Satish Ashok949f1e32015-07-23 05:00:53 -07001859 br_rtr_notify(br->dev, p, RTM_DELMDB);
1860 }
Herbert Xu0909e112010-02-27 19:41:49 +00001861
1862 if (val == 1)
1863 break;
1864
1865 del_timer(&p->multicast_router_timer);
1866
1867 if (val == 0)
1868 break;
1869
1870 br_multicast_add_router(br, p);
1871 break;
Herbert Xu0909e112010-02-27 19:41:49 +00001872 }
1873
Herbert Xu0909e112010-02-27 19:41:49 +00001874 spin_unlock(&br->multicast_lock);
1875
1876 return err;
1877}
Herbert Xu561f1102010-02-27 19:41:50 +00001878
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001879static void br_multicast_start_querier(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +02001880 struct bridge_mcast_own_query *query)
Herbert Xu561f1102010-02-27 19:41:50 +00001881{
1882 struct net_bridge_port *port;
Herbert Xu74857212012-04-13 02:37:42 +00001883
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001884 __br_multicast_open(br, query);
Herbert Xu74857212012-04-13 02:37:42 +00001885
1886 list_for_each_entry(port, &br->port_list, list) {
1887 if (port->state == BR_STATE_DISABLED ||
1888 port->state == BR_STATE_BLOCKING)
1889 continue;
1890
Linus Lüssing90010b32014-06-07 18:26:26 +02001891 if (query == &br->ip4_own_query)
1892 br_multicast_enable(&port->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001893#if IS_ENABLED(CONFIG_IPV6)
1894 else
Linus Lüssing90010b32014-06-07 18:26:26 +02001895 br_multicast_enable(&port->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001896#endif
Herbert Xu74857212012-04-13 02:37:42 +00001897 }
1898}
1899
1900int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1901{
Herbert Xu3a7fda02010-07-29 00:45:30 +00001902 int err = 0;
Eric Dumazete8051682010-11-15 06:38:10 +00001903 struct net_bridge_mdb_htable *mdb;
Herbert Xu561f1102010-02-27 19:41:50 +00001904
Andrey Vaginef5e0d82011-11-10 05:48:03 +00001905 spin_lock_bh(&br->multicast_lock);
Herbert Xu561f1102010-02-27 19:41:50 +00001906 if (br->multicast_disabled == !val)
1907 goto unlock;
1908
1909 br->multicast_disabled = !val;
1910 if (br->multicast_disabled)
1911 goto unlock;
1912
Herbert Xu3a7fda02010-07-29 00:45:30 +00001913 if (!netif_running(br->dev))
1914 goto unlock;
1915
Eric Dumazete8051682010-11-15 06:38:10 +00001916 mdb = mlock_dereference(br->mdb, br);
1917 if (mdb) {
1918 if (mdb->old) {
Herbert Xu561f1102010-02-27 19:41:50 +00001919 err = -EEXIST;
1920rollback:
1921 br->multicast_disabled = !!val;
1922 goto unlock;
1923 }
1924
Eric Dumazete8051682010-11-15 06:38:10 +00001925 err = br_mdb_rehash(&br->mdb, mdb->max,
Herbert Xu561f1102010-02-27 19:41:50 +00001926 br->hash_elasticity);
1927 if (err)
1928 goto rollback;
1929 }
1930
Linus Lüssing90010b32014-06-07 18:26:26 +02001931 br_multicast_start_querier(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001932#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001933 br_multicast_start_querier(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001934#endif
Herbert Xu561f1102010-02-27 19:41:50 +00001935
1936unlock:
Andrey Vaginef5e0d82011-11-10 05:48:03 +00001937 spin_unlock_bh(&br->multicast_lock);
Herbert Xu561f1102010-02-27 19:41:50 +00001938
1939 return err;
1940}
Herbert Xub1951672010-02-27 19:41:51 +00001941
Herbert Xuc5c23262012-04-13 02:37:42 +00001942int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1943{
Linus Lüssingb00589a2013-08-01 01:06:20 +02001944 unsigned long max_delay;
1945
Herbert Xuc5c23262012-04-13 02:37:42 +00001946 val = !!val;
1947
1948 spin_lock_bh(&br->multicast_lock);
1949 if (br->multicast_querier == val)
1950 goto unlock;
1951
1952 br->multicast_querier = val;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001953 if (!val)
1954 goto unlock;
1955
1956 max_delay = br->multicast_query_response_interval;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001957
Linus Lüssing90010b32014-06-07 18:26:26 +02001958 if (!timer_pending(&br->ip4_other_query.timer))
1959 br->ip4_other_query.delay_time = jiffies + max_delay;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001960
Linus Lüssing90010b32014-06-07 18:26:26 +02001961 br_multicast_start_querier(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001962
1963#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001964 if (!timer_pending(&br->ip6_other_query.timer))
1965 br->ip6_other_query.delay_time = jiffies + max_delay;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001966
Linus Lüssing90010b32014-06-07 18:26:26 +02001967 br_multicast_start_querier(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001968#endif
Herbert Xuc5c23262012-04-13 02:37:42 +00001969
1970unlock:
1971 spin_unlock_bh(&br->multicast_lock);
1972
1973 return 0;
1974}
1975
Herbert Xub1951672010-02-27 19:41:51 +00001976int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1977{
Linus Lüssing6ae4ae82015-05-23 03:12:34 +02001978 int err = -EINVAL;
Herbert Xub1951672010-02-27 19:41:51 +00001979 u32 old;
Eric Dumazete8051682010-11-15 06:38:10 +00001980 struct net_bridge_mdb_htable *mdb;
Herbert Xub1951672010-02-27 19:41:51 +00001981
Curt Brunefe0d6922014-01-06 11:00:32 -08001982 spin_lock_bh(&br->multicast_lock);
Herbert Xub1951672010-02-27 19:41:51 +00001983 if (!is_power_of_2(val))
1984 goto unlock;
Eric Dumazete8051682010-11-15 06:38:10 +00001985
1986 mdb = mlock_dereference(br->mdb, br);
1987 if (mdb && val < mdb->size)
Herbert Xub1951672010-02-27 19:41:51 +00001988 goto unlock;
1989
1990 err = 0;
1991
1992 old = br->hash_max;
1993 br->hash_max = val;
1994
Eric Dumazete8051682010-11-15 06:38:10 +00001995 if (mdb) {
1996 if (mdb->old) {
Herbert Xub1951672010-02-27 19:41:51 +00001997 err = -EEXIST;
1998rollback:
1999 br->hash_max = old;
2000 goto unlock;
2001 }
2002
2003 err = br_mdb_rehash(&br->mdb, br->hash_max,
2004 br->hash_elasticity);
2005 if (err)
2006 goto rollback;
2007 }
2008
2009unlock:
Curt Brunefe0d6922014-01-06 11:00:32 -08002010 spin_unlock_bh(&br->multicast_lock);
Herbert Xub1951672010-02-27 19:41:51 +00002011
2012 return err;
2013}
Linus Lüssing07f8ac42014-06-07 18:26:28 +02002014
2015/**
2016 * br_multicast_list_adjacent - Returns snooped multicast addresses
2017 * @dev: The bridge port adjacent to which to retrieve addresses
2018 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2019 *
2020 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2021 * snooping feature on all bridge ports of dev's bridge device, excluding
2022 * the addresses from dev itself.
2023 *
2024 * Returns the number of items added to br_ip_list.
2025 *
2026 * Notes:
2027 * - br_ip_list needs to be initialized by caller
2028 * - br_ip_list might contain duplicates in the end
2029 * (needs to be taken care of by caller)
2030 * - br_ip_list needs to be freed by caller
2031 */
2032int br_multicast_list_adjacent(struct net_device *dev,
2033 struct list_head *br_ip_list)
2034{
2035 struct net_bridge *br;
2036 struct net_bridge_port *port;
2037 struct net_bridge_port_group *group;
2038 struct br_ip_list *entry;
2039 int count = 0;
2040
2041 rcu_read_lock();
2042 if (!br_ip_list || !br_port_exists(dev))
2043 goto unlock;
2044
2045 port = br_port_get_rcu(dev);
2046 if (!port || !port->br)
2047 goto unlock;
2048
2049 br = port->br;
2050
2051 list_for_each_entry_rcu(port, &br->port_list, list) {
2052 if (!port->dev || port->dev == dev)
2053 continue;
2054
2055 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2056 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2057 if (!entry)
2058 goto unlock;
2059
2060 entry->addr = group->addr;
2061 list_add(&entry->list, br_ip_list);
2062 count++;
2063 }
2064 }
2065
2066unlock:
2067 rcu_read_unlock();
2068 return count;
2069}
2070EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
Linus Lüssing2cd41432014-06-07 18:26:29 +02002071
2072/**
Linus Lüssingc34963e2014-07-07 05:41:17 +02002073 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2074 * @dev: The bridge port providing the bridge on which to check for a querier
2075 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2076 *
2077 * Checks whether the given interface has a bridge on top and if so returns
2078 * true if a valid querier exists anywhere on the bridged link layer.
2079 * Otherwise returns false.
2080 */
2081bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2082{
2083 struct net_bridge *br;
2084 struct net_bridge_port *port;
2085 struct ethhdr eth;
2086 bool ret = false;
2087
2088 rcu_read_lock();
2089 if (!br_port_exists(dev))
2090 goto unlock;
2091
2092 port = br_port_get_rcu(dev);
2093 if (!port || !port->br)
2094 goto unlock;
2095
2096 br = port->br;
2097
2098 memset(&eth, 0, sizeof(eth));
2099 eth.h_proto = htons(proto);
2100
2101 ret = br_multicast_querier_exists(br, &eth);
2102
2103unlock:
2104 rcu_read_unlock();
2105 return ret;
2106}
2107EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2108
2109/**
Linus Lüssing2cd41432014-06-07 18:26:29 +02002110 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2111 * @dev: The bridge port adjacent to which to check for a querier
2112 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2113 *
2114 * Checks whether the given interface has a bridge on top and if so returns
2115 * true if a selected querier is behind one of the other ports of this
2116 * bridge. Otherwise returns false.
2117 */
2118bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2119{
2120 struct net_bridge *br;
2121 struct net_bridge_port *port;
2122 bool ret = false;
2123
2124 rcu_read_lock();
2125 if (!br_port_exists(dev))
2126 goto unlock;
2127
2128 port = br_port_get_rcu(dev);
2129 if (!port || !port->br)
2130 goto unlock;
2131
2132 br = port->br;
2133
2134 switch (proto) {
2135 case ETH_P_IP:
2136 if (!timer_pending(&br->ip4_other_query.timer) ||
2137 rcu_dereference(br->ip4_querier.port) == port)
2138 goto unlock;
2139 break;
Linus Lüssing3993c4e2014-06-12 01:41:24 +02002140#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing2cd41432014-06-07 18:26:29 +02002141 case ETH_P_IPV6:
2142 if (!timer_pending(&br->ip6_other_query.timer) ||
2143 rcu_dereference(br->ip6_querier.port) == port)
2144 goto unlock;
2145 break;
Linus Lüssing3993c4e2014-06-12 01:41:24 +02002146#endif
Linus Lüssing2cd41432014-06-07 18:26:29 +02002147 default:
2148 goto unlock;
2149 }
2150
2151 ret = true;
2152unlock:
2153 rcu_read_unlock();
2154 return ret;
2155}
2156EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);