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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);
Elad Raz45ebcce2016-04-21 12:52:45 +0200286 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
287 p->flags);
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) ||
Elad Raz9d06b6d2016-02-03 09:57:05 +0100307 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_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,
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200364 __be32 group,
365 u8 *igmp_type)
Herbert Xueb1d1642010-02-27 19:41:45 +0000366{
367 struct sk_buff *skb;
368 struct igmphdr *ih;
369 struct ethhdr *eth;
370 struct iphdr *iph;
371
372 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
373 sizeof(*ih) + 4);
374 if (!skb)
375 goto out;
376
377 skb->protocol = htons(ETH_P_IP);
378
379 skb_reset_mac_header(skb);
380 eth = eth_hdr(skb);
381
Joe Perchese5a727f2014-02-23 00:05:25 -0800382 ether_addr_copy(eth->h_source, br->dev->dev_addr);
Herbert Xueb1d1642010-02-27 19:41:45 +0000383 eth->h_dest[0] = 1;
384 eth->h_dest[1] = 0;
385 eth->h_dest[2] = 0x5e;
386 eth->h_dest[3] = 0;
387 eth->h_dest[4] = 0;
388 eth->h_dest[5] = 1;
389 eth->h_proto = htons(ETH_P_IP);
390 skb_put(skb, sizeof(*eth));
391
392 skb_set_network_header(skb, skb->len);
393 iph = ip_hdr(skb);
394
395 iph->version = 4;
396 iph->ihl = 6;
397 iph->tos = 0xc0;
398 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
399 iph->id = 0;
400 iph->frag_off = htons(IP_DF);
401 iph->ttl = 1;
402 iph->protocol = IPPROTO_IGMP;
Cong Wang1c8ad5b2013-05-21 21:52:54 +0000403 iph->saddr = br->multicast_query_use_ifaddr ?
404 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
Herbert Xueb1d1642010-02-27 19:41:45 +0000405 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
406 ((u8 *)&iph[1])[0] = IPOPT_RA;
407 ((u8 *)&iph[1])[1] = 4;
408 ((u8 *)&iph[1])[2] = 0;
409 ((u8 *)&iph[1])[3] = 0;
410 ip_send_check(iph);
411 skb_put(skb, 24);
412
413 skb_set_transport_header(skb, skb->len);
414 ih = igmp_hdr(skb);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200415 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
Herbert Xueb1d1642010-02-27 19:41:45 +0000416 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
417 ih->code = (group ? br->multicast_last_member_interval :
418 br->multicast_query_response_interval) /
419 (HZ / IGMP_TIMER_SCALE);
420 ih->group = group;
421 ih->csum = 0;
422 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
423 skb_put(skb, sizeof(*ih));
424
425 __skb_pull(skb, sizeof(*eth));
426
427out:
428 return skb;
429}
430
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000431#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900432static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200433 const struct in6_addr *grp,
434 u8 *igmp_type)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900435{
436 struct sk_buff *skb;
437 struct ipv6hdr *ip6h;
438 struct mld_msg *mldq;
439 struct ethhdr *eth;
440 u8 *hopopt;
441 unsigned long interval;
442
443 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
444 8 + sizeof(*mldq));
445 if (!skb)
446 goto out;
447
448 skb->protocol = htons(ETH_P_IPV6);
449
450 /* Ethernet header */
451 skb_reset_mac_header(skb);
452 eth = eth_hdr(skb);
453
Joe Perchese5a727f2014-02-23 00:05:25 -0800454 ether_addr_copy(eth->h_source, br->dev->dev_addr);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900455 eth->h_proto = htons(ETH_P_IPV6);
456 skb_put(skb, sizeof(*eth));
457
458 /* IPv6 header + HbH option */
459 skb_set_network_header(skb, skb->len);
460 ip6h = ipv6_hdr(skb);
461
462 *(__force __be32 *)ip6h = htonl(0x60000000);
David Stevens76d66152010-12-14 08:42:16 +0000463 ip6h->payload_len = htons(8 + sizeof(*mldq));
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900464 ip6h->nexthdr = IPPROTO_HOPOPTS;
465 ip6h->hop_limit = 1;
Linus Lüssinga7bff752011-03-22 11:40:32 +0000466 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
Ulrich Weberd1d81d42012-03-05 04:52:44 +0000467 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
468 &ip6h->saddr)) {
469 kfree_skb(skb);
daniel0888d5f2016-06-24 12:35:18 +0200470 br->has_ipv6_addr = 0;
Ulrich Weberd1d81d42012-03-05 04:52:44 +0000471 return NULL;
472 }
daniel0888d5f2016-06-24 12:35:18 +0200473
474 br->has_ipv6_addr = 1;
Linus Lüssing36cff5a2011-02-17 08:17:51 +0000475 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900476
477 hopopt = (u8 *)(ip6h + 1);
478 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
479 hopopt[1] = 0; /* length of HbH */
480 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
481 hopopt[3] = 2; /* Length of RA Option */
482 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
483 hopopt[5] = 0;
Eldad Zack1de5a712012-05-17 06:00:25 +0000484 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
485 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900486
487 skb_put(skb, sizeof(*ip6h) + 8);
488
489 /* ICMPv6 */
490 skb_set_transport_header(skb, skb->len);
491 mldq = (struct mld_msg *) icmp6_hdr(skb);
492
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200493 interval = ipv6_addr_any(grp) ?
Linus Lüssing32de8682013-06-16 23:20:34 +0200494 br->multicast_query_response_interval :
495 br->multicast_last_member_interval;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900496
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200497 *igmp_type = ICMPV6_MGM_QUERY;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900498 mldq->mld_type = ICMPV6_MGM_QUERY;
499 mldq->mld_code = 0;
500 mldq->mld_cksum = 0;
501 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
502 mldq->mld_reserved = 0;
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200503 mldq->mld_mca = *grp;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900504
505 /* checksum */
506 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
507 sizeof(*mldq), IPPROTO_ICMPV6,
508 csum_partial(mldq,
509 sizeof(*mldq), 0));
510 skb_put(skb, sizeof(*mldq));
511
512 __skb_pull(skb, sizeof(*eth));
513
514out:
515 return skb;
516}
517#endif
518
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900519static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200520 struct br_ip *addr,
521 u8 *igmp_type)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900522{
523 switch (addr->proto) {
524 case htons(ETH_P_IP):
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200525 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000526#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900527 case htons(ETH_P_IPV6):
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200528 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
529 igmp_type);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900530#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900531 }
532 return NULL;
533}
534
Herbert Xueb1d1642010-02-27 19:41:45 +0000535static struct net_bridge_mdb_entry *br_multicast_get_group(
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900536 struct net_bridge *br, struct net_bridge_port *port,
537 struct br_ip *group, int hash)
Herbert Xueb1d1642010-02-27 19:41:45 +0000538{
Eric Dumazete8051682010-11-15 06:38:10 +0000539 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000540 struct net_bridge_mdb_entry *mp;
Eric Dumazet95c96172012-04-15 05:58:06 +0000541 unsigned int count = 0;
542 unsigned int max;
Herbert Xueb1d1642010-02-27 19:41:45 +0000543 int elasticity;
544 int err;
545
Eric Dumazete8051682010-11-15 06:38:10 +0000546 mdb = rcu_dereference_protected(br->mdb, 1);
Sasha Levinb67bfe02013-02-27 17:06:00 -0800547 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000548 count++;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900549 if (unlikely(br_ip_equal(group, &mp->addr)))
Herbert Xueb1d1642010-02-27 19:41:45 +0000550 return mp;
Herbert Xueb1d1642010-02-27 19:41:45 +0000551 }
552
553 elasticity = 0;
554 max = mdb->max;
555
556 if (unlikely(count > br->hash_elasticity && count)) {
557 if (net_ratelimit())
stephen hemminger28a16c92010-05-10 09:31:09 +0000558 br_info(br, "Multicast hash table "
559 "chain limit reached: %s\n",
560 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000561
562 elasticity = br->hash_elasticity;
563 }
564
565 if (mdb->size >= max) {
566 max *= 2;
Thomas Graf036be6d2012-07-10 22:29:19 +0000567 if (unlikely(max > br->hash_max)) {
568 br_warn(br, "Multicast hash table maximum of %d "
569 "reached, disabling snooping: %s\n",
570 br->hash_max,
571 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000572 err = -E2BIG;
573disable:
574 br->multicast_disabled = 1;
575 goto err;
576 }
577 }
578
579 if (max > mdb->max || elasticity) {
580 if (mdb->old) {
581 if (net_ratelimit())
stephen hemminger28a16c92010-05-10 09:31:09 +0000582 br_info(br, "Multicast hash table "
583 "on fire: %s\n",
584 port ? port->dev->name : br->dev->name);
Herbert Xueb1d1642010-02-27 19:41:45 +0000585 err = -EEXIST;
586 goto err;
587 }
588
589 err = br_mdb_rehash(&br->mdb, max, elasticity);
590 if (err) {
stephen hemminger28a16c92010-05-10 09:31:09 +0000591 br_warn(br, "Cannot rehash multicast "
592 "hash table, disabling snooping: %s, %d, %d\n",
593 port ? port->dev->name : br->dev->name,
594 mdb->size, err);
Herbert Xueb1d1642010-02-27 19:41:45 +0000595 goto disable;
596 }
597
598 err = -EAGAIN;
599 goto err;
600 }
601
602 return NULL;
603
604err:
605 mp = ERR_PTR(err);
606 return mp;
607}
608
Cong Wangcfd56752012-12-11 22:23:08 +0000609struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
610 struct net_bridge_port *port, struct br_ip *group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000611{
Eric Dumazete8051682010-11-15 06:38:10 +0000612 struct net_bridge_mdb_htable *mdb;
Herbert Xueb1d1642010-02-27 19:41:45 +0000613 struct net_bridge_mdb_entry *mp;
614 int hash;
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000615 int err;
Herbert Xueb1d1642010-02-27 19:41:45 +0000616
Eric Dumazete8051682010-11-15 06:38:10 +0000617 mdb = rcu_dereference_protected(br->mdb, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000618 if (!mdb) {
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000619 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
620 if (err)
621 return ERR_PTR(err);
Herbert Xueb1d1642010-02-27 19:41:45 +0000622 goto rehash;
623 }
624
625 hash = br_ip_hash(mdb, group);
626 mp = br_multicast_get_group(br, port, group, hash);
627 switch (PTR_ERR(mp)) {
628 case 0:
629 break;
630
631 case -EAGAIN:
632rehash:
Eric Dumazete8051682010-11-15 06:38:10 +0000633 mdb = rcu_dereference_protected(br->mdb, 1);
Herbert Xueb1d1642010-02-27 19:41:45 +0000634 hash = br_ip_hash(mdb, group);
635 break;
636
637 default:
638 goto out;
639 }
640
641 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
642 if (unlikely(!mp))
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000643 return ERR_PTR(-ENOMEM);
Herbert Xueb1d1642010-02-27 19:41:45 +0000644
645 mp->br = br;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900646 mp->addr = *group;
Eric Dumazet1faabf22013-07-19 20:07:16 -0700647 setup_timer(&mp->timer, br_multicast_group_expired,
648 (unsigned long)mp);
649
Herbert Xueb1d1642010-02-27 19:41:45 +0000650 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
651 mdb->size++;
652
653out:
654 return mp;
655}
656
Cong Wangcfd56752012-12-11 22:23:08 +0000657struct net_bridge_port_group *br_multicast_new_port_group(
658 struct net_bridge_port *port,
659 struct br_ip *group,
Amerigo Wangccb1c312012-12-14 22:09:51 +0000660 struct net_bridge_port_group __rcu *next,
Elad Raz9d06b6d2016-02-03 09:57:05 +0100661 unsigned char flags)
Cong Wangcfd56752012-12-11 22:23:08 +0000662{
663 struct net_bridge_port_group *p;
664
665 p = kzalloc(sizeof(*p), GFP_ATOMIC);
666 if (unlikely(!p))
667 return NULL;
668
669 p->addr = *group;
670 p->port = port;
Elad Raz9d06b6d2016-02-03 09:57:05 +0100671 p->flags = flags;
stephen hemmingereca2a432012-12-13 06:51:28 +0000672 rcu_assign_pointer(p->next, next);
Cong Wangcfd56752012-12-11 22:23:08 +0000673 hlist_add_head(&p->mglist, &port->mglist);
674 setup_timer(&p->timer, br_multicast_port_group_expired,
675 (unsigned long)p);
676 return p;
677}
678
Herbert Xueb1d1642010-02-27 19:41:45 +0000679static int br_multicast_add_group(struct net_bridge *br,
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900680 struct net_bridge_port *port,
681 struct br_ip *group)
Herbert Xueb1d1642010-02-27 19:41:45 +0000682{
683 struct net_bridge_mdb_entry *mp;
684 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +0000685 struct net_bridge_port_group __rcu **pp;
Linus Lüssing454594f2013-10-20 00:58:57 +0200686 unsigned long now = jiffies;
Herbert Xueb1d1642010-02-27 19:41:45 +0000687 int err;
688
Herbert Xueb1d1642010-02-27 19:41:45 +0000689 spin_lock(&br->multicast_lock);
690 if (!netif_running(br->dev) ||
691 (port && port->state == BR_STATE_DISABLED))
692 goto out;
693
694 mp = br_multicast_new_group(br, port, group);
695 err = PTR_ERR(mp);
Tobias Klauser4c0833b2010-12-10 03:18:04 +0000696 if (IS_ERR(mp))
Herbert Xueb1d1642010-02-27 19:41:45 +0000697 goto err;
698
699 if (!port) {
Herbert Xu8a870172011-02-12 01:05:42 -0800700 mp->mglist = true;
Linus Lüssing454594f2013-10-20 00:58:57 +0200701 mod_timer(&mp->timer, now + br->multicast_membership_interval);
Herbert Xueb1d1642010-02-27 19:41:45 +0000702 goto out;
703 }
704
Eric Dumazete8051682010-11-15 06:38:10 +0000705 for (pp = &mp->ports;
706 (p = mlock_dereference(*pp, br)) != NULL;
707 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000708 if (p->port == port)
Linus Lüssing454594f2013-10-20 00:58:57 +0200709 goto found;
Herbert Xueb1d1642010-02-27 19:41:45 +0000710 if ((unsigned long)p->port < (unsigned long)port)
711 break;
712 }
713
Elad Raz9d06b6d2016-02-03 09:57:05 +0100714 p = br_multicast_new_port_group(port, group, *pp, 0);
Herbert Xueb1d1642010-02-27 19:41:45 +0000715 if (unlikely(!p))
716 goto err;
Herbert Xueb1d1642010-02-27 19:41:45 +0000717 rcu_assign_pointer(*pp, p);
Elad Raz45ebcce2016-04-21 12:52:45 +0200718 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
Herbert Xueb1d1642010-02-27 19:41:45 +0000719
Linus Lüssing454594f2013-10-20 00:58:57 +0200720found:
721 mod_timer(&p->timer, now + br->multicast_membership_interval);
Herbert Xueb1d1642010-02-27 19:41:45 +0000722out:
723 err = 0;
724
725err:
726 spin_unlock(&br->multicast_lock);
727 return err;
728}
729
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900730static int br_ip4_multicast_add_group(struct net_bridge *br,
731 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000732 __be32 group,
733 __u16 vid)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900734{
735 struct br_ip br_group;
736
737 if (ipv4_is_local_multicast(group))
738 return 0;
739
740 br_group.u.ip4 = group;
741 br_group.proto = htons(ETH_P_IP);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000742 br_group.vid = vid;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900743
744 return br_multicast_add_group(br, port, &br_group);
745}
746
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000747#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900748static int br_ip6_multicast_add_group(struct net_bridge *br,
749 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000750 const struct in6_addr *group,
751 __u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900752{
753 struct br_ip br_group;
754
Linus Lüssing3c3769e2013-09-04 02:13:39 +0200755 if (ipv6_addr_is_ll_all_nodes(group))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900756 return 0;
757
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +0000758 br_group.u.ip6 = *group;
Linus Lüssing9cc6e0c2011-02-15 13:19:17 +0000759 br_group.proto = htons(ETH_P_IPV6);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +0000760 br_group.vid = vid;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900761
762 return br_multicast_add_group(br, port, &br_group);
763}
764#endif
765
Herbert Xueb1d1642010-02-27 19:41:45 +0000766static void br_multicast_router_expired(unsigned long data)
767{
768 struct net_bridge_port *port = (void *)data;
769 struct net_bridge *br = port->br;
770
771 spin_lock(&br->multicast_lock);
Nikolay Aleksandrova55d8242016-02-26 21:20:03 +0100772 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
773 port->multicast_router == MDB_RTR_TYPE_PERM ||
Herbert Xueb1d1642010-02-27 19:41:45 +0000774 timer_pending(&port->multicast_router_timer) ||
775 hlist_unhashed(&port->rlist))
776 goto out;
777
778 hlist_del_init_rcu(&port->rlist);
Satish Ashok949f1e32015-07-23 05:00:53 -0700779 br_rtr_notify(br->dev, port, RTM_DELMDB);
Nikolay Aleksandrova55d8242016-02-26 21:20:03 +0100780 /* Don't allow timer refresh if the router expired */
781 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
782 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
Herbert Xueb1d1642010-02-27 19:41:45 +0000783
784out:
785 spin_unlock(&br->multicast_lock);
786}
787
788static void br_multicast_local_router_expired(unsigned long data)
789{
790}
791
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200792static void br_multicast_querier_expired(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +0200793 struct bridge_mcast_own_query *query)
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000794{
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000795 spin_lock(&br->multicast_lock);
796 if (!netif_running(br->dev) || br->multicast_disabled)
797 goto out;
798
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200799 br_multicast_start_querier(br, query);
Herbert Xuc83b8fa2012-04-13 02:37:42 +0000800
801out:
802 spin_unlock(&br->multicast_lock);
803}
804
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200805static void br_ip4_multicast_querier_expired(unsigned long data)
806{
807 struct net_bridge *br = (void *)data;
808
Linus Lüssing90010b32014-06-07 18:26:26 +0200809 br_multicast_querier_expired(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200810}
811
812#if IS_ENABLED(CONFIG_IPV6)
813static void br_ip6_multicast_querier_expired(unsigned long data)
814{
815 struct net_bridge *br = (void *)data;
816
Linus Lüssing90010b32014-06-07 18:26:26 +0200817 br_multicast_querier_expired(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200818}
819#endif
820
Linus Lüssingdc4eb532014-06-07 18:26:27 +0200821static void br_multicast_select_own_querier(struct net_bridge *br,
822 struct br_ip *ip,
823 struct sk_buff *skb)
824{
825 if (ip->proto == htons(ETH_P_IP))
826 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
827#if IS_ENABLED(CONFIG_IPV6)
828 else
829 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
830#endif
831}
832
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900833static void __br_multicast_send_query(struct net_bridge *br,
834 struct net_bridge_port *port,
835 struct br_ip *ip)
Herbert Xueb1d1642010-02-27 19:41:45 +0000836{
Herbert Xueb1d1642010-02-27 19:41:45 +0000837 struct sk_buff *skb;
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200838 u8 igmp_type;
Herbert Xueb1d1642010-02-27 19:41:45 +0000839
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200840 skb = br_multicast_alloc_query(br, ip, &igmp_type);
Herbert Xueb1d1642010-02-27 19:41:45 +0000841 if (!skb)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900842 return;
Herbert Xueb1d1642010-02-27 19:41:45 +0000843
844 if (port) {
Herbert Xueb1d1642010-02-27 19:41:45 +0000845 skb->dev = port->dev;
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -0700846 br_multicast_count(br, port, skb, igmp_type,
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200847 BR_MCAST_DIR_TX);
Eric W. Biederman29a26a52015-09-15 20:04:16 -0500848 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
849 dev_net(port->dev), NULL, skb, NULL, skb->dev,
Linus Lüssingf0b4eec2014-11-17 12:20:28 +0100850 br_dev_queue_push_xmit);
Linus Lüssingdc4eb532014-06-07 18:26:27 +0200851 } else {
852 br_multicast_select_own_querier(br, ip, skb);
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -0700853 br_multicast_count(br, port, skb, igmp_type,
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200854 BR_MCAST_DIR_RX);
Herbert Xueb1d1642010-02-27 19:41:45 +0000855 netif_rx(skb);
Linus Lüssingdc4eb532014-06-07 18:26:27 +0200856 }
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900857}
Herbert Xueb1d1642010-02-27 19:41:45 +0000858
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900859static void br_multicast_send_query(struct net_bridge *br,
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200860 struct net_bridge_port *port,
Linus Lüssing90010b32014-06-07 18:26:26 +0200861 struct bridge_mcast_own_query *own_query)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900862{
863 unsigned long time;
864 struct br_ip br_group;
Linus Lüssing90010b32014-06-07 18:26:26 +0200865 struct bridge_mcast_other_query *other_query = NULL;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900866
867 if (!netif_running(br->dev) || br->multicast_disabled ||
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200868 !br->multicast_querier)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900869 return;
870
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900871 memset(&br_group.u, 0, sizeof(br_group.u));
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +0900872
Linus Lüssing90010b32014-06-07 18:26:26 +0200873 if (port ? (own_query == &port->ip4_own_query) :
874 (own_query == &br->ip4_own_query)) {
875 other_query = &br->ip4_other_query;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200876 br_group.proto = htons(ETH_P_IP);
Eric Dumazetdfd56b82011-12-10 09:48:31 +0000877#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200878 } else {
Linus Lüssing90010b32014-06-07 18:26:26 +0200879 other_query = &br->ip6_other_query;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200880 br_group.proto = htons(ETH_P_IPV6);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900881#endif
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200882 }
883
Linus Lüssing90010b32014-06-07 18:26:26 +0200884 if (!other_query || timer_pending(&other_query->timer))
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200885 return;
886
887 __br_multicast_send_query(br, port, &br_group);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +0900888
Herbert Xueb1d1642010-02-27 19:41:45 +0000889 time = jiffies;
Linus Lüssing90010b32014-06-07 18:26:26 +0200890 time += own_query->startup_sent < br->multicast_startup_query_count ?
Herbert Xueb1d1642010-02-27 19:41:45 +0000891 br->multicast_startup_query_interval :
892 br->multicast_query_interval;
Linus Lüssing90010b32014-06-07 18:26:26 +0200893 mod_timer(&own_query->timer, time);
Herbert Xueb1d1642010-02-27 19:41:45 +0000894}
895
Linus Lüssing90010b32014-06-07 18:26:26 +0200896static void
897br_multicast_port_query_expired(struct net_bridge_port *port,
898 struct bridge_mcast_own_query *query)
Herbert Xueb1d1642010-02-27 19:41:45 +0000899{
Herbert Xueb1d1642010-02-27 19:41:45 +0000900 struct net_bridge *br = port->br;
901
902 spin_lock(&br->multicast_lock);
Dan Carpenter02a780c2010-03-06 01:14:09 +0000903 if (port->state == BR_STATE_DISABLED ||
904 port->state == BR_STATE_BLOCKING)
Herbert Xueb1d1642010-02-27 19:41:45 +0000905 goto out;
906
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200907 if (query->startup_sent < br->multicast_startup_query_count)
908 query->startup_sent++;
Herbert Xueb1d1642010-02-27 19:41:45 +0000909
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200910 br_multicast_send_query(port->br, port, query);
Herbert Xueb1d1642010-02-27 19:41:45 +0000911
912out:
913 spin_unlock(&br->multicast_lock);
914}
915
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200916static void br_ip4_multicast_port_query_expired(unsigned long data)
917{
918 struct net_bridge_port *port = (void *)data;
919
Linus Lüssing90010b32014-06-07 18:26:26 +0200920 br_multicast_port_query_expired(port, &port->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200921}
922
923#if IS_ENABLED(CONFIG_IPV6)
924static void br_ip6_multicast_port_query_expired(unsigned long data)
925{
926 struct net_bridge_port *port = (void *)data;
927
Linus Lüssing90010b32014-06-07 18:26:26 +0200928 br_multicast_port_query_expired(port, &port->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200929}
930#endif
931
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200932int br_multicast_add_port(struct net_bridge_port *port)
Herbert Xueb1d1642010-02-27 19:41:45 +0000933{
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +0100934 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
Herbert Xueb1d1642010-02-27 19:41:45 +0000935
936 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
937 (unsigned long)port);
Linus Lüssing90010b32014-06-07 18:26:26 +0200938 setup_timer(&port->ip4_own_query.timer,
939 br_ip4_multicast_port_query_expired, (unsigned long)port);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200940#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +0200941 setup_timer(&port->ip6_own_query.timer,
942 br_ip6_multicast_port_query_expired, (unsigned long)port);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200943#endif
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200944 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
945 if (!port->mcast_stats)
946 return -ENOMEM;
947
948 return 0;
Herbert Xueb1d1642010-02-27 19:41:45 +0000949}
950
951void br_multicast_del_port(struct net_bridge_port *port)
952{
Satish Ashoke10177a2015-07-15 07:16:51 -0700953 struct net_bridge *br = port->br;
954 struct net_bridge_port_group *pg;
955 struct hlist_node *n;
956
957 /* Take care of the remaining groups, only perm ones should be left */
958 spin_lock_bh(&br->multicast_lock);
959 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
960 br_multicast_del_pg(br, pg);
961 spin_unlock_bh(&br->multicast_lock);
Herbert Xueb1d1642010-02-27 19:41:45 +0000962 del_timer_sync(&port->multicast_router_timer);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +0200963 free_percpu(port->mcast_stats);
Herbert Xueb1d1642010-02-27 19:41:45 +0000964}
965
Linus Lüssing90010b32014-06-07 18:26:26 +0200966static void br_multicast_enable(struct bridge_mcast_own_query *query)
Herbert Xu561f1102010-02-27 19:41:50 +0000967{
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200968 query->startup_sent = 0;
Herbert Xu561f1102010-02-27 19:41:50 +0000969
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200970 if (try_to_del_timer_sync(&query->timer) >= 0 ||
971 del_timer(&query->timer))
972 mod_timer(&query->timer, jiffies);
Herbert Xu561f1102010-02-27 19:41:50 +0000973}
974
Herbert Xueb1d1642010-02-27 19:41:45 +0000975void br_multicast_enable_port(struct net_bridge_port *port)
976{
977 struct net_bridge *br = port->br;
978
979 spin_lock(&br->multicast_lock);
980 if (br->multicast_disabled || !netif_running(br->dev))
981 goto out;
982
Linus Lüssing90010b32014-06-07 18:26:26 +0200983 br_multicast_enable(&port->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200984#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +0200985 br_multicast_enable(&port->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +0200986#endif
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +0100987 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
988 hlist_unhashed(&port->rlist))
Satish Ashok754bc542015-06-19 01:22:57 -0700989 br_multicast_add_router(br, port);
Herbert Xueb1d1642010-02-27 19:41:45 +0000990
991out:
992 spin_unlock(&br->multicast_lock);
993}
994
995void br_multicast_disable_port(struct net_bridge_port *port)
996{
997 struct net_bridge *br = port->br;
998 struct net_bridge_port_group *pg;
Sasha Levinb67bfe02013-02-27 17:06:00 -0800999 struct hlist_node *n;
Herbert Xueb1d1642010-02-27 19:41:45 +00001000
1001 spin_lock(&br->multicast_lock);
Sasha Levinb67bfe02013-02-27 17:06:00 -08001002 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
Elad Raz9d06b6d2016-02-03 09:57:05 +01001003 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
Satish Ashoke10177a2015-07-15 07:16:51 -07001004 br_multicast_del_pg(br, pg);
Herbert Xueb1d1642010-02-27 19:41:45 +00001005
Satish Ashok949f1e32015-07-23 05:00:53 -07001006 if (!hlist_unhashed(&port->rlist)) {
Herbert Xueb1d1642010-02-27 19:41:45 +00001007 hlist_del_init_rcu(&port->rlist);
Satish Ashok949f1e32015-07-23 05:00:53 -07001008 br_rtr_notify(br->dev, port, RTM_DELMDB);
Nikolay Aleksandrova55d8242016-02-26 21:20:03 +01001009 /* Don't allow timer refresh if disabling */
1010 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
1011 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
Satish Ashok949f1e32015-07-23 05:00:53 -07001012 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001013 del_timer(&port->multicast_router_timer);
Linus Lüssing90010b32014-06-07 18:26:26 +02001014 del_timer(&port->ip4_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001015#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001016 del_timer(&port->ip6_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001017#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001018 spin_unlock(&br->multicast_lock);
1019}
1020
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001021static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1022 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001023 struct sk_buff *skb,
1024 u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +00001025{
1026 struct igmpv3_report *ih;
1027 struct igmpv3_grec *grec;
1028 int i;
1029 int len;
1030 int num;
1031 int type;
1032 int err = 0;
1033 __be32 group;
1034
Herbert Xueb1d1642010-02-27 19:41:45 +00001035 ih = igmpv3_report_hdr(skb);
1036 num = ntohs(ih->ngrec);
Linus Lüssingc2d4fbd2015-09-11 18:39:48 +02001037 len = skb_transport_offset(skb) + sizeof(*ih);
Herbert Xueb1d1642010-02-27 19:41:45 +00001038
1039 for (i = 0; i < num; i++) {
1040 len += sizeof(*grec);
1041 if (!pskb_may_pull(skb, len))
1042 return -EINVAL;
1043
Herbert Xufd218cf2010-04-07 21:20:47 -07001044 grec = (void *)(skb->data + len - sizeof(*grec));
Herbert Xueb1d1642010-02-27 19:41:45 +00001045 group = grec->grec_mca;
1046 type = grec->grec_type;
1047
Eric Dumazet8eabf952010-04-20 03:20:05 +00001048 len += ntohs(grec->grec_nsrcs) * 4;
Herbert Xueb1d1642010-02-27 19:41:45 +00001049 if (!pskb_may_pull(skb, len))
1050 return -EINVAL;
1051
1052 /* We treat this as an IGMPv2 report for now. */
1053 switch (type) {
1054 case IGMPV3_MODE_IS_INCLUDE:
1055 case IGMPV3_MODE_IS_EXCLUDE:
1056 case IGMPV3_CHANGE_TO_INCLUDE:
1057 case IGMPV3_CHANGE_TO_EXCLUDE:
1058 case IGMPV3_ALLOW_NEW_SOURCES:
1059 case IGMPV3_BLOCK_OLD_SOURCES:
1060 break;
1061
1062 default:
1063 continue;
1064 }
1065
Satish Ashokbc8c20a2015-07-13 05:28:37 -07001066 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1067 type == IGMPV3_MODE_IS_INCLUDE) &&
1068 ntohs(grec->grec_nsrcs) == 0) {
1069 br_ip4_multicast_leave_group(br, port, group, vid);
1070 } else {
1071 err = br_ip4_multicast_add_group(br, port, group, vid);
1072 if (err)
1073 break;
1074 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001075 }
1076
1077 return err;
1078}
1079
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001080#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001081static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1082 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001083 struct sk_buff *skb,
1084 u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001085{
1086 struct icmp6hdr *icmp6h;
1087 struct mld2_grec *grec;
1088 int i;
1089 int len;
1090 int num;
1091 int err = 0;
1092
1093 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1094 return -EINVAL;
1095
1096 icmp6h = icmp6_hdr(skb);
1097 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
Linus Lüssingc2d4fbd2015-09-11 18:39:48 +02001098 len = skb_transport_offset(skb) + sizeof(*icmp6h);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001099
1100 for (i = 0; i < num; i++) {
1101 __be16 *nsrcs, _nsrcs;
1102
1103 nsrcs = skb_header_pointer(skb,
1104 len + offsetof(struct mld2_grec,
Linus Lüssing649e9842011-02-15 13:19:18 +00001105 grec_nsrcs),
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001106 sizeof(_nsrcs), &_nsrcs);
1107 if (!nsrcs)
1108 return -EINVAL;
1109
1110 if (!pskb_may_pull(skb,
1111 len + sizeof(*grec) +
Linus Lüssingd41db9f2011-02-15 13:19:19 +00001112 sizeof(struct in6_addr) * ntohs(*nsrcs)))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001113 return -EINVAL;
1114
1115 grec = (struct mld2_grec *)(skb->data + len);
Linus Lüssingd41db9f2011-02-15 13:19:19 +00001116 len += sizeof(*grec) +
1117 sizeof(struct in6_addr) * ntohs(*nsrcs);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001118
1119 /* We treat these as MLDv1 reports for now. */
1120 switch (grec->grec_type) {
1121 case MLD2_MODE_IS_INCLUDE:
1122 case MLD2_MODE_IS_EXCLUDE:
1123 case MLD2_CHANGE_TO_INCLUDE:
1124 case MLD2_CHANGE_TO_EXCLUDE:
1125 case MLD2_ALLOW_NEW_SOURCES:
1126 case MLD2_BLOCK_OLD_SOURCES:
1127 break;
1128
1129 default:
1130 continue;
1131 }
1132
Satish Ashokbc8c20a2015-07-13 05:28:37 -07001133 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1134 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1135 ntohs(*nsrcs) == 0) {
1136 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1137 vid);
1138 } else {
1139 err = br_ip6_multicast_add_group(br, port,
1140 &grec->grec_mca, vid);
Davide Caratti92642512016-08-31 14:16:44 +02001141 if (err)
Satish Ashokbc8c20a2015-07-13 05:28:37 -07001142 break;
1143 }
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001144 }
1145
1146 return err;
1147}
1148#endif
1149
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001150static bool br_ip4_multicast_select_querier(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001151 struct net_bridge_port *port,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001152 __be32 saddr)
1153{
1154 if (!timer_pending(&br->ip4_own_query.timer) &&
1155 !timer_pending(&br->ip4_other_query.timer))
1156 goto update;
1157
1158 if (!br->ip4_querier.addr.u.ip4)
1159 goto update;
1160
1161 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1162 goto update;
1163
1164 return false;
1165
1166update:
1167 br->ip4_querier.addr.u.ip4 = saddr;
1168
Linus Lüssing2cd41432014-06-07 18:26:29 +02001169 /* update protected by general multicast_lock by caller */
1170 rcu_assign_pointer(br->ip4_querier.port, port);
1171
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001172 return true;
1173}
1174
1175#if IS_ENABLED(CONFIG_IPV6)
1176static bool br_ip6_multicast_select_querier(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001177 struct net_bridge_port *port,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001178 struct in6_addr *saddr)
1179{
1180 if (!timer_pending(&br->ip6_own_query.timer) &&
1181 !timer_pending(&br->ip6_other_query.timer))
1182 goto update;
1183
1184 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1185 goto update;
1186
1187 return false;
1188
1189update:
1190 br->ip6_querier.addr.u.ip6 = *saddr;
1191
Linus Lüssing2cd41432014-06-07 18:26:29 +02001192 /* update protected by general multicast_lock by caller */
1193 rcu_assign_pointer(br->ip6_querier.port, port);
1194
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001195 return true;
1196}
1197#endif
1198
1199static bool br_multicast_select_querier(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001200 struct net_bridge_port *port,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001201 struct br_ip *saddr)
1202{
1203 switch (saddr->proto) {
1204 case htons(ETH_P_IP):
Linus Lüssing2cd41432014-06-07 18:26:29 +02001205 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001206#if IS_ENABLED(CONFIG_IPV6)
1207 case htons(ETH_P_IPV6):
Linus Lüssing2cd41432014-06-07 18:26:29 +02001208 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001209#endif
1210 }
1211
1212 return false;
1213}
1214
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001215static void
Linus Lüssing90010b32014-06-07 18:26:26 +02001216br_multicast_update_query_timer(struct net_bridge *br,
1217 struct bridge_mcast_other_query *query,
1218 unsigned long max_delay)
Linus Lüssingb00589a2013-08-01 01:06:20 +02001219{
Linus Lüssing90010b32014-06-07 18:26:26 +02001220 if (!timer_pending(&query->timer))
1221 query->delay_time = jiffies + max_delay;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001222
Linus Lüssing90010b32014-06-07 18:26:26 +02001223 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
Linus Lüssingb00589a2013-08-01 01:06:20 +02001224}
1225
stephen hemminger7e80c122010-04-27 15:01:04 +00001226/*
Cong Wang7c776022013-06-21 15:37:25 +08001227 * Add port to router_list
stephen hemminger7e80c122010-04-27 15:01:04 +00001228 * list is maintained ordered by pointer value
1229 * and locked by br->multicast_lock and RCU
1230 */
Herbert Xu0909e112010-02-27 19:41:49 +00001231static void br_multicast_add_router(struct net_bridge *br,
1232 struct net_bridge_port *port)
1233{
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001234 struct net_bridge_port *p;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001235 struct hlist_node *slot = NULL;
Herbert Xu0909e112010-02-27 19:41:49 +00001236
Nikolay Aleksandrov1a040ea2015-06-09 10:23:57 -07001237 if (!hlist_unhashed(&port->rlist))
1238 return;
1239
Sasha Levinb67bfe02013-02-27 17:06:00 -08001240 hlist_for_each_entry(p, &br->router_list, rlist) {
stephen hemminger7e80c122010-04-27 15:01:04 +00001241 if ((unsigned long) port >= (unsigned long) p)
1242 break;
Sasha Levinb67bfe02013-02-27 17:06:00 -08001243 slot = &p->rlist;
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001244 }
Herbert Xu0909e112010-02-27 19:41:49 +00001245
stephen hemminger7e80c122010-04-27 15:01:04 +00001246 if (slot)
Ken Helias1d023282014-08-06 16:09:16 -07001247 hlist_add_behind_rcu(&port->rlist, slot);
stephen hemmingerdcdca2c2010-04-27 07:13:11 +00001248 else
1249 hlist_add_head_rcu(&port->rlist, &br->router_list);
Satish Ashok949f1e32015-07-23 05:00:53 -07001250 br_rtr_notify(br->dev, port, RTM_NEWMDB);
Herbert Xu0909e112010-02-27 19:41:49 +00001251}
1252
Herbert Xueb1d1642010-02-27 19:41:45 +00001253static void br_multicast_mark_router(struct net_bridge *br,
1254 struct net_bridge_port *port)
1255{
1256 unsigned long now = jiffies;
Herbert Xueb1d1642010-02-27 19:41:45 +00001257
1258 if (!port) {
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +01001259 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
Herbert Xueb1d1642010-02-27 19:41:45 +00001260 mod_timer(&br->multicast_router_timer,
1261 now + br->multicast_querier_interval);
1262 return;
1263 }
1264
Nikolay Aleksandrova55d8242016-02-26 21:20:03 +01001265 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1266 port->multicast_router == MDB_RTR_TYPE_PERM)
Herbert Xueb1d1642010-02-27 19:41:45 +00001267 return;
1268
Herbert Xu0909e112010-02-27 19:41:49 +00001269 br_multicast_add_router(br, port);
Herbert Xueb1d1642010-02-27 19:41:45 +00001270
Herbert Xueb1d1642010-02-27 19:41:45 +00001271 mod_timer(&port->multicast_router_timer,
1272 now + br->multicast_querier_interval);
1273}
1274
1275static void br_multicast_query_received(struct net_bridge *br,
1276 struct net_bridge_port *port,
Linus Lüssing90010b32014-06-07 18:26:26 +02001277 struct bridge_mcast_other_query *query,
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001278 struct br_ip *saddr,
Linus Lüssingb00589a2013-08-01 01:06:20 +02001279 unsigned long max_delay)
Herbert Xueb1d1642010-02-27 19:41:45 +00001280{
Linus Lüssing2cd41432014-06-07 18:26:29 +02001281 if (!br_multicast_select_querier(br, port, saddr))
Herbert Xueb1d1642010-02-27 19:41:45 +00001282 return;
1283
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001284 br_multicast_update_query_timer(br, query, max_delay);
Herbert Xueb1d1642010-02-27 19:41:45 +00001285 br_multicast_mark_router(br, port);
1286}
1287
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001288static int br_ip4_multicast_query(struct net_bridge *br,
1289 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001290 struct sk_buff *skb,
1291 u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +00001292{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001293 const struct iphdr *iph = ip_hdr(skb);
Herbert Xueb1d1642010-02-27 19:41:45 +00001294 struct igmphdr *ih = igmp_hdr(skb);
1295 struct net_bridge_mdb_entry *mp;
1296 struct igmpv3_query *ih3;
1297 struct net_bridge_port_group *p;
Eric Dumazete8051682010-11-15 06:38:10 +00001298 struct net_bridge_port_group __rcu **pp;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001299 struct br_ip saddr;
Herbert Xueb1d1642010-02-27 19:41:45 +00001300 unsigned long max_delay;
1301 unsigned long now = jiffies;
Linus Lüssing856ce5d2016-05-04 17:25:02 +02001302 unsigned int offset = skb_transport_offset(skb);
Herbert Xueb1d1642010-02-27 19:41:45 +00001303 __be32 group;
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001304 int err = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001305
1306 spin_lock(&br->multicast_lock);
1307 if (!netif_running(br->dev) ||
1308 (port && port->state == BR_STATE_DISABLED))
1309 goto out;
1310
Herbert Xueb1d1642010-02-27 19:41:45 +00001311 group = ih->group;
1312
Linus Lüssing856ce5d2016-05-04 17:25:02 +02001313 if (skb->len == offset + sizeof(*ih)) {
Herbert Xueb1d1642010-02-27 19:41:45 +00001314 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1315
1316 if (!max_delay) {
1317 max_delay = 10 * HZ;
1318 group = 0;
1319 }
Linus Lüssing856ce5d2016-05-04 17:25:02 +02001320 } else if (skb->len >= offset + sizeof(*ih3)) {
Herbert Xueb1d1642010-02-27 19:41:45 +00001321 ih3 = igmpv3_query_hdr(skb);
1322 if (ih3->nsrcs)
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001323 goto out;
Herbert Xueb1d1642010-02-27 19:41:45 +00001324
YOSHIFUJI Hideaki / 吉藤英明0ba8c9e2010-03-15 19:27:00 +00001325 max_delay = ih3->code ?
1326 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001327 } else {
Linus Lüssing9ed973c2014-03-10 22:25:24 +01001328 goto out;
1329 }
1330
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001331 if (!group) {
1332 saddr.proto = htons(ETH_P_IP);
1333 saddr.u.ip4 = iph->saddr;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001334
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001335 br_multicast_query_received(br, port, &br->ip4_other_query,
1336 &saddr, max_delay);
Herbert Xueb1d1642010-02-27 19:41:45 +00001337 goto out;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001338 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001339
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001340 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001341 if (!mp)
1342 goto out;
1343
1344 max_delay *= br->multicast_last_member_count;
1345
Herbert Xu8a870172011-02-12 01:05:42 -08001346 if (mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +00001347 (timer_pending(&mp->timer) ?
1348 time_after(mp->timer.expires, now + max_delay) :
1349 try_to_del_timer_sync(&mp->timer) >= 0))
1350 mod_timer(&mp->timer, now + max_delay);
1351
Eric Dumazete8051682010-11-15 06:38:10 +00001352 for (pp = &mp->ports;
1353 (p = mlock_dereference(*pp, br)) != NULL;
1354 pp = &p->next) {
Herbert Xueb1d1642010-02-27 19:41:45 +00001355 if (timer_pending(&p->timer) ?
1356 time_after(p->timer.expires, now + max_delay) :
1357 try_to_del_timer_sync(&p->timer) >= 0)
Herbert Xu24f9cdc2011-02-11 12:42:07 +00001358 mod_timer(&p->timer, now + max_delay);
Herbert Xueb1d1642010-02-27 19:41:45 +00001359 }
1360
1361out:
1362 spin_unlock(&br->multicast_lock);
YOSHIFUJI Hideakibec68ff2010-03-13 12:27:21 -08001363 return err;
Herbert Xueb1d1642010-02-27 19:41:45 +00001364}
1365
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001366#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001367static int br_ip6_multicast_query(struct net_bridge *br,
1368 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001369 struct sk_buff *skb,
1370 u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001371{
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001372 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
stephen hemmingereca2a432012-12-13 06:51:28 +00001373 struct mld_msg *mld;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001374 struct net_bridge_mdb_entry *mp;
1375 struct mld2_query *mld2q;
Eric Dumazete8051682010-11-15 06:38:10 +00001376 struct net_bridge_port_group *p;
1377 struct net_bridge_port_group __rcu **pp;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001378 struct br_ip saddr;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001379 unsigned long max_delay;
1380 unsigned long now = jiffies;
Linus Lüssing856ce5d2016-05-04 17:25:02 +02001381 unsigned int offset = skb_transport_offset(skb);
Eric Dumazetb71d1d42011-04-22 04:53:02 +00001382 const struct in6_addr *group = NULL;
Linus Lüssing9ed973c2014-03-10 22:25:24 +01001383 bool is_general_query;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001384 int err = 0;
1385
1386 spin_lock(&br->multicast_lock);
1387 if (!netif_running(br->dev) ||
1388 (port && port->state == BR_STATE_DISABLED))
1389 goto out;
1390
Linus Lüssing856ce5d2016-05-04 17:25:02 +02001391 if (skb->len == offset + sizeof(*mld)) {
1392 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001393 err = -EINVAL;
1394 goto out;
1395 }
1396 mld = (struct mld_msg *) icmp6_hdr(skb);
Li RongQing47152132012-07-09 23:56:12 +00001397 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001398 if (max_delay)
1399 group = &mld->mld_mca;
Linus Lüssing248ba8e2013-08-06 00:32:05 +02001400 } else {
Linus Lüssing856ce5d2016-05-04 17:25:02 +02001401 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001402 err = -EINVAL;
1403 goto out;
1404 }
1405 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1406 if (!mld2q->mld2q_nsrcs)
1407 group = &mld2q->mld2q_mca;
Daniel Borkmanne3f5b172013-09-04 00:19:39 +02001408
1409 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001410 }
1411
Linus Lüssing9ed973c2014-03-10 22:25:24 +01001412 is_general_query = group && ipv6_addr_any(group);
1413
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001414 if (is_general_query) {
1415 saddr.proto = htons(ETH_P_IPV6);
1416 saddr.u.ip6 = ip6h->saddr;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001417
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001418 br_multicast_query_received(br, port, &br->ip6_other_query,
1419 &saddr, max_delay);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001420 goto out;
Linus Lüssing6c03ee82014-06-12 01:41:23 +02001421 } else if (!group) {
1422 goto out;
Linus Lüssingdc4eb532014-06-07 18:26:27 +02001423 }
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001424
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001425 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001426 if (!mp)
1427 goto out;
1428
1429 max_delay *= br->multicast_last_member_count;
Herbert Xu8a870172011-02-12 01:05:42 -08001430 if (mp->mglist &&
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001431 (timer_pending(&mp->timer) ?
1432 time_after(mp->timer.expires, now + max_delay) :
1433 try_to_del_timer_sync(&mp->timer) >= 0))
1434 mod_timer(&mp->timer, now + max_delay);
1435
Eric Dumazete8051682010-11-15 06:38:10 +00001436 for (pp = &mp->ports;
1437 (p = mlock_dereference(*pp, br)) != NULL;
1438 pp = &p->next) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001439 if (timer_pending(&p->timer) ?
1440 time_after(p->timer.expires, now + max_delay) :
1441 try_to_del_timer_sync(&p->timer) >= 0)
Herbert Xu24f9cdc2011-02-11 12:42:07 +00001442 mod_timer(&p->timer, now + max_delay);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001443 }
1444
1445out:
1446 spin_unlock(&br->multicast_lock);
1447 return err;
1448}
1449#endif
1450
Linus Lüssing90010b32014-06-07 18:26:26 +02001451static void
1452br_multicast_leave_group(struct net_bridge *br,
1453 struct net_bridge_port *port,
1454 struct br_ip *group,
1455 struct bridge_mcast_other_query *other_query,
1456 struct bridge_mcast_own_query *own_query)
Herbert Xueb1d1642010-02-27 19:41:45 +00001457{
1458 struct net_bridge_mdb_htable *mdb;
1459 struct net_bridge_mdb_entry *mp;
1460 struct net_bridge_port_group *p;
1461 unsigned long now;
1462 unsigned long time;
1463
Herbert Xueb1d1642010-02-27 19:41:45 +00001464 spin_lock(&br->multicast_lock);
1465 if (!netif_running(br->dev) ||
Satish Ashok544586f2015-07-28 03:28:27 -07001466 (port && port->state == BR_STATE_DISABLED))
Herbert Xueb1d1642010-02-27 19:41:45 +00001467 goto out;
1468
Eric Dumazete8051682010-11-15 06:38:10 +00001469 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +00001470 mp = br_mdb_ip_get(mdb, group);
1471 if (!mp)
1472 goto out;
1473
Satish Ashok544586f2015-07-28 03:28:27 -07001474 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1475 struct net_bridge_port_group __rcu **pp;
1476
1477 for (pp = &mp->ports;
1478 (p = mlock_dereference(*pp, br)) != NULL;
1479 pp = &p->next) {
1480 if (p->port != port)
1481 continue;
1482
1483 rcu_assign_pointer(*pp, p->next);
1484 hlist_del_init(&p->mglist);
1485 del_timer(&p->timer);
1486 call_rcu_bh(&p->rcu, br_multicast_free_pg);
Elad Raz45ebcce2016-04-21 12:52:45 +02001487 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1488 p->flags);
Satish Ashok544586f2015-07-28 03:28:27 -07001489
1490 if (!mp->ports && !mp->mglist &&
1491 netif_running(br->dev))
1492 mod_timer(&mp->timer, jiffies);
1493 }
1494 goto out;
1495 }
1496
1497 if (timer_pending(&other_query->timer))
1498 goto out;
1499
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001500 if (br->multicast_querier) {
Cong Wang6b7df112013-05-21 21:52:56 +00001501 __br_multicast_send_query(br, port, &mp->addr);
1502
1503 time = jiffies + br->multicast_last_member_count *
1504 br->multicast_last_member_interval;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001505
Linus Lüssing90010b32014-06-07 18:26:26 +02001506 mod_timer(&own_query->timer, time);
Cong Wang6b7df112013-05-21 21:52:56 +00001507
1508 for (p = mlock_dereference(mp->ports, br);
1509 p != NULL;
1510 p = mlock_dereference(p->next, br)) {
1511 if (p->port != port)
1512 continue;
1513
1514 if (!hlist_unhashed(&p->mglist) &&
1515 (timer_pending(&p->timer) ?
1516 time_after(p->timer.expires, time) :
1517 try_to_del_timer_sync(&p->timer) >= 0)) {
1518 mod_timer(&p->timer, time);
1519 }
1520
1521 break;
1522 }
1523 }
1524
Herbert Xueb1d1642010-02-27 19:41:45 +00001525 now = jiffies;
1526 time = now + br->multicast_last_member_count *
1527 br->multicast_last_member_interval;
1528
1529 if (!port) {
Linus Lüssing454594f2013-10-20 00:58:57 +02001530 if (mp->mglist &&
Herbert Xueb1d1642010-02-27 19:41:45 +00001531 (timer_pending(&mp->timer) ?
1532 time_after(mp->timer.expires, time) :
1533 try_to_del_timer_sync(&mp->timer) >= 0)) {
1534 mod_timer(&mp->timer, time);
Herbert Xueb1d1642010-02-27 19:41:45 +00001535 }
Linus Lüssing454594f2013-10-20 00:58:57 +02001536
1537 goto out;
1538 }
1539
1540 for (p = mlock_dereference(mp->ports, br);
1541 p != NULL;
1542 p = mlock_dereference(p->next, br)) {
1543 if (p->port != port)
1544 continue;
1545
1546 if (!hlist_unhashed(&p->mglist) &&
1547 (timer_pending(&p->timer) ?
1548 time_after(p->timer.expires, time) :
1549 try_to_del_timer_sync(&p->timer) >= 0)) {
1550 mod_timer(&p->timer, time);
1551 }
1552
1553 break;
Herbert Xueb1d1642010-02-27 19:41:45 +00001554 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001555out:
1556 spin_unlock(&br->multicast_lock);
1557}
1558
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001559static void br_ip4_multicast_leave_group(struct net_bridge *br,
1560 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001561 __be32 group,
1562 __u16 vid)
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001563{
1564 struct br_ip br_group;
Linus Lüssing90010b32014-06-07 18:26:26 +02001565 struct bridge_mcast_own_query *own_query;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001566
1567 if (ipv4_is_local_multicast(group))
1568 return;
1569
Linus Lüssing90010b32014-06-07 18:26:26 +02001570 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1571
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001572 br_group.u.ip4 = group;
1573 br_group.proto = htons(ETH_P_IP);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001574 br_group.vid = vid;
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001575
Linus Lüssing90010b32014-06-07 18:26:26 +02001576 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1577 own_query);
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001578}
1579
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001580#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001581static void br_ip6_multicast_leave_group(struct net_bridge *br,
1582 struct net_bridge_port *port,
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001583 const struct in6_addr *group,
1584 __u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001585{
1586 struct br_ip br_group;
Linus Lüssing90010b32014-06-07 18:26:26 +02001587 struct bridge_mcast_own_query *own_query;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001588
Linus Lüssing3c3769e2013-09-04 02:13:39 +02001589 if (ipv6_addr_is_ll_all_nodes(group))
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001590 return;
1591
Linus Lüssing90010b32014-06-07 18:26:26 +02001592 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1593
Alexey Dobriyan4e3fd7a2011-11-21 03:39:03 +00001594 br_group.u.ip6 = *group;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001595 br_group.proto = htons(ETH_P_IPV6);
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001596 br_group.vid = vid;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001597
Linus Lüssing90010b32014-06-07 18:26:26 +02001598 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1599 own_query);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001600}
1601#endif
YOSHIFUJI Hideaki8ef2a9a2010-04-18 12:42:07 +09001602
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001603static void br_multicast_err_count(const struct net_bridge *br,
1604 const struct net_bridge_port *p,
1605 __be16 proto)
1606{
1607 struct bridge_mcast_stats __percpu *stats;
1608 struct bridge_mcast_stats *pstats;
1609
1610 if (!br->multicast_stats_enabled)
1611 return;
1612
1613 if (p)
1614 stats = p->mcast_stats;
1615 else
1616 stats = br->mcast_stats;
1617 if (WARN_ON(!stats))
1618 return;
1619
1620 pstats = this_cpu_ptr(stats);
1621
1622 u64_stats_update_begin(&pstats->syncp);
1623 switch (proto) {
1624 case htons(ETH_P_IP):
1625 pstats->mstats.igmp_parse_errors++;
1626 break;
1627#if IS_ENABLED(CONFIG_IPV6)
1628 case htons(ETH_P_IPV6):
1629 pstats->mstats.mld_parse_errors++;
1630 break;
1631#endif
1632 }
1633 u64_stats_update_end(&pstats->syncp);
1634}
1635
Herbert Xueb1d1642010-02-27 19:41:45 +00001636static int br_multicast_ipv4_rcv(struct net_bridge *br,
1637 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001638 struct sk_buff *skb,
1639 u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +00001640{
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001641 struct sk_buff *skb_trimmed = NULL;
Herbert Xueb1d1642010-02-27 19:41:45 +00001642 struct igmphdr *ih;
Herbert Xueb1d1642010-02-27 19:41:45 +00001643 int err;
1644
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001645 err = ip_mc_check_igmp(skb, &skb_trimmed);
Herbert Xueb1d1642010-02-27 19:41:45 +00001646
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001647 if (err == -ENOMSG) {
1648 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
Herbert Xubd4265f2011-06-23 02:39:12 +00001649 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Herbert Xueb1d1642010-02-27 19:41:45 +00001650 return 0;
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001651 } else if (err < 0) {
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001652 br_multicast_err_count(br, port, skb->protocol);
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001653 return err;
Herbert Xubd4265f2011-06-23 02:39:12 +00001654 }
Herbert Xueb1d1642010-02-27 19:41:45 +00001655
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001656 ih = igmp_hdr(skb);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001657 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
Herbert Xueb1d1642010-02-27 19:41:45 +00001658
1659 switch (ih->type) {
1660 case IGMP_HOST_MEMBERSHIP_REPORT:
1661 case IGMPV2_HOST_MEMBERSHIP_REPORT:
Fernando Luis Vázquez Cao62b2bcb2011-06-13 15:04:43 +00001662 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001663 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001664 break;
1665 case IGMPV3_HOST_MEMBERSHIP_REPORT:
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001666 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001667 break;
1668 case IGMP_HOST_MEMBERSHIP_QUERY:
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001669 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001670 break;
1671 case IGMP_HOST_LEAVE_MESSAGE:
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001672 br_ip4_multicast_leave_group(br, port, ih->group, vid);
Herbert Xueb1d1642010-02-27 19:41:45 +00001673 break;
1674 }
1675
Linus Lüssinga5169932015-08-13 05:54:07 +02001676 if (skb_trimmed && skb_trimmed != skb)
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001677 kfree_skb(skb_trimmed);
1678
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07001679 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001680 BR_MCAST_DIR_RX);
1681
Herbert Xueb1d1642010-02-27 19:41:45 +00001682 return err;
1683}
1684
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001685#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001686static int br_multicast_ipv6_rcv(struct net_bridge *br,
1687 struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001688 struct sk_buff *skb,
1689 u16 vid)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001690{
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001691 struct sk_buff *skb_trimmed = NULL;
1692 struct mld_msg *mld;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001693 int err;
1694
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001695 err = ipv6_mc_check_mld(skb, &skb_trimmed);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001696
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001697 if (err == -ENOMSG) {
1698 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1699 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Linus Lüssing8fad9c32013-09-04 02:13:38 +02001700 return 0;
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001701 } else if (err < 0) {
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001702 br_multicast_err_count(br, port, skb->protocol);
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001703 return err;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001704 }
1705
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001706 mld = (struct mld_msg *)skb_transport_header(skb);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001707 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001708
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001709 switch (mld->mld_type) {
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001710 case ICMPV6_MGM_REPORT:
Fernando Luis Vázquez Caofc2af6c2011-06-13 15:06:58 +00001711 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001712 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001713 break;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001714 case ICMPV6_MLD2_REPORT:
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001715 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001716 break;
1717 case ICMPV6_MGM_QUERY:
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001718 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001719 break;
1720 case ICMPV6_MGM_REDUCTION:
Vlad Yasevichb0e9a302013-02-13 12:00:17 +00001721 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001722 break;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001723 }
1724
Linus Lüssinga5169932015-08-13 05:54:07 +02001725 if (skb_trimmed && skb_trimmed != skb)
Linus Lüssing9afd85c2015-05-02 14:01:07 +02001726 kfree_skb(skb_trimmed);
1727
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07001728 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001729 BR_MCAST_DIR_RX);
1730
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001731 return err;
1732}
1733#endif
1734
Herbert Xueb1d1642010-02-27 19:41:45 +00001735int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
Vlad Yasevich06499092013-10-28 15:45:07 -04001736 struct sk_buff *skb, u16 vid)
Herbert Xueb1d1642010-02-27 19:41:45 +00001737{
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001738 int ret = 0;
1739
YOSHIFUJI Hideaki / 吉藤英明1fafc7a2010-04-25 08:06:40 +00001740 BR_INPUT_SKB_CB(skb)->igmp = 0;
1741 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1742
Herbert Xueb1d1642010-02-27 19:41:45 +00001743 if (br->multicast_disabled)
1744 return 0;
1745
1746 switch (skb->protocol) {
1747 case htons(ETH_P_IP):
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001748 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1749 break;
Eric Dumazetdfd56b82011-12-10 09:48:31 +00001750#if IS_ENABLED(CONFIG_IPV6)
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001751 case htons(ETH_P_IPV6):
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001752 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1753 break;
YOSHIFUJI Hideaki08b202b2010-04-23 01:54:22 +09001754#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001755 }
1756
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001757 return ret;
Herbert Xueb1d1642010-02-27 19:41:45 +00001758}
1759
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001760static void br_multicast_query_expired(struct net_bridge *br,
Linus Lüssing2cd41432014-06-07 18:26:29 +02001761 struct bridge_mcast_own_query *query,
1762 struct bridge_mcast_querier *querier)
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001763{
1764 spin_lock(&br->multicast_lock);
1765 if (query->startup_sent < br->multicast_startup_query_count)
1766 query->startup_sent++;
1767
Eric Dumazet71d9f612015-05-28 04:42:54 -07001768 RCU_INIT_POINTER(querier->port, NULL);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001769 br_multicast_send_query(br, NULL, query);
1770 spin_unlock(&br->multicast_lock);
1771}
1772
1773static void br_ip4_multicast_query_expired(unsigned long data)
Herbert Xueb1d1642010-02-27 19:41:45 +00001774{
1775 struct net_bridge *br = (void *)data;
1776
Linus Lüssing2cd41432014-06-07 18:26:29 +02001777 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
Herbert Xueb1d1642010-02-27 19:41:45 +00001778}
1779
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001780#if IS_ENABLED(CONFIG_IPV6)
1781static void br_ip6_multicast_query_expired(unsigned long data)
1782{
1783 struct net_bridge *br = (void *)data;
1784
Linus Lüssing2cd41432014-06-07 18:26:29 +02001785 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001786}
1787#endif
1788
Herbert Xueb1d1642010-02-27 19:41:45 +00001789void br_multicast_init(struct net_bridge *br)
1790{
1791 br->hash_elasticity = 4;
1792 br->hash_max = 512;
1793
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +01001794 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
Herbert Xuc5c23262012-04-13 02:37:42 +00001795 br->multicast_querier = 0;
Cong Wang1c8ad5b2013-05-21 21:52:54 +00001796 br->multicast_query_use_ifaddr = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001797 br->multicast_last_member_count = 2;
1798 br->multicast_startup_query_count = 2;
1799
1800 br->multicast_last_member_interval = HZ;
1801 br->multicast_query_response_interval = 10 * HZ;
1802 br->multicast_startup_query_interval = 125 * HZ / 4;
1803 br->multicast_query_interval = 125 * HZ;
1804 br->multicast_querier_interval = 255 * HZ;
1805 br->multicast_membership_interval = 260 * HZ;
1806
Linus Lüssing90010b32014-06-07 18:26:26 +02001807 br->ip4_other_query.delay_time = 0;
Linus Lüssing2cd41432014-06-07 18:26:29 +02001808 br->ip4_querier.port = NULL;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001809#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001810 br->ip6_other_query.delay_time = 0;
Linus Lüssing2cd41432014-06-07 18:26:29 +02001811 br->ip6_querier.port = NULL;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001812#endif
daniel0888d5f2016-06-24 12:35:18 +02001813 br->has_ipv6_addr = 1;
Linus Lüssingb00589a2013-08-01 01:06:20 +02001814
Herbert Xueb1d1642010-02-27 19:41:45 +00001815 spin_lock_init(&br->multicast_lock);
1816 setup_timer(&br->multicast_router_timer,
1817 br_multicast_local_router_expired, 0);
Linus Lüssing90010b32014-06-07 18:26:26 +02001818 setup_timer(&br->ip4_other_query.timer,
1819 br_ip4_multicast_querier_expired, (unsigned long)br);
1820 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001821 (unsigned long)br);
1822#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001823 setup_timer(&br->ip6_other_query.timer,
1824 br_ip6_multicast_querier_expired, (unsigned long)br);
1825 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001826 (unsigned long)br);
1827#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001828}
1829
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001830static void __br_multicast_open(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +02001831 struct bridge_mcast_own_query *query)
Herbert Xueb1d1642010-02-27 19:41:45 +00001832{
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001833 query->startup_sent = 0;
Herbert Xueb1d1642010-02-27 19:41:45 +00001834
1835 if (br->multicast_disabled)
1836 return;
1837
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001838 mod_timer(&query->timer, jiffies);
1839}
1840
1841void br_multicast_open(struct net_bridge *br)
1842{
Linus Lüssing90010b32014-06-07 18:26:26 +02001843 __br_multicast_open(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001844#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001845 __br_multicast_open(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001846#endif
Herbert Xueb1d1642010-02-27 19:41:45 +00001847}
1848
1849void br_multicast_stop(struct net_bridge *br)
1850{
Herbert Xueb1d1642010-02-27 19:41:45 +00001851 del_timer_sync(&br->multicast_router_timer);
Linus Lüssing90010b32014-06-07 18:26:26 +02001852 del_timer_sync(&br->ip4_other_query.timer);
1853 del_timer_sync(&br->ip4_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001854#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02001855 del_timer_sync(&br->ip6_other_query.timer);
1856 del_timer_sync(&br->ip6_own_query.timer);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001857#endif
Satish Ashoke10177a2015-07-15 07:16:51 -07001858}
1859
1860void br_multicast_dev_del(struct net_bridge *br)
1861{
1862 struct net_bridge_mdb_htable *mdb;
1863 struct net_bridge_mdb_entry *mp;
1864 struct hlist_node *n;
1865 u32 ver;
1866 int i;
Herbert Xueb1d1642010-02-27 19:41:45 +00001867
1868 spin_lock_bh(&br->multicast_lock);
Eric Dumazete8051682010-11-15 06:38:10 +00001869 mdb = mlock_dereference(br->mdb, br);
Herbert Xueb1d1642010-02-27 19:41:45 +00001870 if (!mdb)
1871 goto out;
1872
1873 br->mdb = NULL;
1874
1875 ver = mdb->ver;
1876 for (i = 0; i < mdb->max; i++) {
Sasha Levinb67bfe02013-02-27 17:06:00 -08001877 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
Herbert Xueb1d1642010-02-27 19:41:45 +00001878 hlist[ver]) {
1879 del_timer(&mp->timer);
Herbert Xueb1d1642010-02-27 19:41:45 +00001880 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1881 }
1882 }
1883
1884 if (mdb->old) {
1885 spin_unlock_bh(&br->multicast_lock);
Herbert Xu10cc2b52010-03-05 21:03:35 +00001886 rcu_barrier_bh();
Herbert Xueb1d1642010-02-27 19:41:45 +00001887 spin_lock_bh(&br->multicast_lock);
1888 WARN_ON(mdb->old);
1889 }
1890
1891 mdb->old = mdb;
1892 call_rcu_bh(&mdb->rcu, br_mdb_free);
1893
1894out:
1895 spin_unlock_bh(&br->multicast_lock);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02001896
1897 free_percpu(br->mcast_stats);
Herbert Xueb1d1642010-02-27 19:41:45 +00001898}
Herbert Xu0909e112010-02-27 19:41:49 +00001899
1900int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1901{
Linus Lüssing6ae4ae82015-05-23 03:12:34 +02001902 int err = -EINVAL;
Herbert Xu0909e112010-02-27 19:41:49 +00001903
1904 spin_lock_bh(&br->multicast_lock);
Herbert Xu0909e112010-02-27 19:41:49 +00001905
1906 switch (val) {
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +01001907 case MDB_RTR_TYPE_DISABLED:
1908 case MDB_RTR_TYPE_PERM:
Herbert Xu0909e112010-02-27 19:41:49 +00001909 del_timer(&br->multicast_router_timer);
1910 /* fall through */
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +01001911 case MDB_RTR_TYPE_TEMP_QUERY:
Herbert Xu0909e112010-02-27 19:41:49 +00001912 br->multicast_router = val;
1913 err = 0;
1914 break;
Herbert Xu0909e112010-02-27 19:41:49 +00001915 }
1916
Herbert Xu0909e112010-02-27 19:41:49 +00001917 spin_unlock_bh(&br->multicast_lock);
1918
1919 return err;
1920}
1921
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +01001922static void __del_port_router(struct net_bridge_port *p)
1923{
1924 if (hlist_unhashed(&p->rlist))
1925 return;
1926 hlist_del_init_rcu(&p->rlist);
1927 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1928}
1929
Herbert Xu0909e112010-02-27 19:41:49 +00001930int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1931{
1932 struct net_bridge *br = p->br;
Nikolay Aleksandrova55d8242016-02-26 21:20:03 +01001933 unsigned long now = jiffies;
Linus Lüssing6ae4ae82015-05-23 03:12:34 +02001934 int err = -EINVAL;
Herbert Xu0909e112010-02-27 19:41:49 +00001935
1936 spin_lock(&br->multicast_lock);
Nikolay Aleksandrov4950cfd2016-02-26 21:20:02 +01001937 if (p->multicast_router == val) {
Nikolay Aleksandrova55d8242016-02-26 21:20:03 +01001938 /* Refresh the temp router port timer */
1939 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1940 mod_timer(&p->multicast_router_timer,
1941 now + br->multicast_querier_interval);
Nikolay Aleksandrov4950cfd2016-02-26 21:20:02 +01001942 err = 0;
1943 goto unlock;
1944 }
Herbert Xu0909e112010-02-27 19:41:49 +00001945 switch (val) {
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +01001946 case MDB_RTR_TYPE_DISABLED:
1947 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1948 __del_port_router(p);
Herbert Xu0909e112010-02-27 19:41:49 +00001949 del_timer(&p->multicast_router_timer);
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +01001950 break;
1951 case MDB_RTR_TYPE_TEMP_QUERY:
1952 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1953 __del_port_router(p);
1954 break;
1955 case MDB_RTR_TYPE_PERM:
1956 p->multicast_router = MDB_RTR_TYPE_PERM;
1957 del_timer(&p->multicast_router_timer);
Herbert Xu0909e112010-02-27 19:41:49 +00001958 br_multicast_add_router(br, p);
1959 break;
Nikolay Aleksandrova55d8242016-02-26 21:20:03 +01001960 case MDB_RTR_TYPE_TEMP:
1961 p->multicast_router = MDB_RTR_TYPE_TEMP;
1962 br_multicast_mark_router(br, p);
1963 break;
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +01001964 default:
1965 goto unlock;
Herbert Xu0909e112010-02-27 19:41:49 +00001966 }
Nikolay Aleksandrov7f0aec72016-02-26 21:20:01 +01001967 err = 0;
1968unlock:
Herbert Xu0909e112010-02-27 19:41:49 +00001969 spin_unlock(&br->multicast_lock);
1970
1971 return err;
1972}
Herbert Xu561f1102010-02-27 19:41:50 +00001973
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001974static void br_multicast_start_querier(struct net_bridge *br,
Linus Lüssing90010b32014-06-07 18:26:26 +02001975 struct bridge_mcast_own_query *query)
Herbert Xu561f1102010-02-27 19:41:50 +00001976{
1977 struct net_bridge_port *port;
Herbert Xu74857212012-04-13 02:37:42 +00001978
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001979 __br_multicast_open(br, query);
Herbert Xu74857212012-04-13 02:37:42 +00001980
1981 list_for_each_entry(port, &br->port_list, list) {
1982 if (port->state == BR_STATE_DISABLED ||
1983 port->state == BR_STATE_BLOCKING)
1984 continue;
1985
Linus Lüssing90010b32014-06-07 18:26:26 +02001986 if (query == &br->ip4_own_query)
1987 br_multicast_enable(&port->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001988#if IS_ENABLED(CONFIG_IPV6)
1989 else
Linus Lüssing90010b32014-06-07 18:26:26 +02001990 br_multicast_enable(&port->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02001991#endif
Herbert Xu74857212012-04-13 02:37:42 +00001992 }
1993}
1994
1995int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1996{
Herbert Xu3a7fda02010-07-29 00:45:30 +00001997 int err = 0;
Eric Dumazete8051682010-11-15 06:38:10 +00001998 struct net_bridge_mdb_htable *mdb;
Herbert Xu561f1102010-02-27 19:41:50 +00001999
Andrey Vaginef5e0d82011-11-10 05:48:03 +00002000 spin_lock_bh(&br->multicast_lock);
Herbert Xu561f1102010-02-27 19:41:50 +00002001 if (br->multicast_disabled == !val)
2002 goto unlock;
2003
2004 br->multicast_disabled = !val;
2005 if (br->multicast_disabled)
2006 goto unlock;
2007
Herbert Xu3a7fda02010-07-29 00:45:30 +00002008 if (!netif_running(br->dev))
2009 goto unlock;
2010
Eric Dumazete8051682010-11-15 06:38:10 +00002011 mdb = mlock_dereference(br->mdb, br);
2012 if (mdb) {
2013 if (mdb->old) {
Herbert Xu561f1102010-02-27 19:41:50 +00002014 err = -EEXIST;
2015rollback:
2016 br->multicast_disabled = !!val;
2017 goto unlock;
2018 }
2019
Eric Dumazete8051682010-11-15 06:38:10 +00002020 err = br_mdb_rehash(&br->mdb, mdb->max,
Herbert Xu561f1102010-02-27 19:41:50 +00002021 br->hash_elasticity);
2022 if (err)
2023 goto rollback;
2024 }
2025
Linus Lüssing90010b32014-06-07 18:26:26 +02002026 br_multicast_start_querier(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002027#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02002028 br_multicast_start_querier(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002029#endif
Herbert Xu561f1102010-02-27 19:41:50 +00002030
2031unlock:
Andrey Vaginef5e0d82011-11-10 05:48:03 +00002032 spin_unlock_bh(&br->multicast_lock);
Herbert Xu561f1102010-02-27 19:41:50 +00002033
2034 return err;
2035}
Herbert Xub1951672010-02-27 19:41:51 +00002036
Herbert Xuc5c23262012-04-13 02:37:42 +00002037int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2038{
Linus Lüssingb00589a2013-08-01 01:06:20 +02002039 unsigned long max_delay;
2040
Herbert Xuc5c23262012-04-13 02:37:42 +00002041 val = !!val;
2042
2043 spin_lock_bh(&br->multicast_lock);
2044 if (br->multicast_querier == val)
2045 goto unlock;
2046
2047 br->multicast_querier = val;
Linus Lüssingb00589a2013-08-01 01:06:20 +02002048 if (!val)
2049 goto unlock;
2050
2051 max_delay = br->multicast_query_response_interval;
Linus Lüssingb00589a2013-08-01 01:06:20 +02002052
Linus Lüssing90010b32014-06-07 18:26:26 +02002053 if (!timer_pending(&br->ip4_other_query.timer))
2054 br->ip4_other_query.delay_time = jiffies + max_delay;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002055
Linus Lüssing90010b32014-06-07 18:26:26 +02002056 br_multicast_start_querier(br, &br->ip4_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002057
2058#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing90010b32014-06-07 18:26:26 +02002059 if (!timer_pending(&br->ip6_other_query.timer))
2060 br->ip6_other_query.delay_time = jiffies + max_delay;
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002061
Linus Lüssing90010b32014-06-07 18:26:26 +02002062 br_multicast_start_querier(br, &br->ip6_own_query);
Linus Lüssingcc0fdd82013-08-30 17:28:17 +02002063#endif
Herbert Xuc5c23262012-04-13 02:37:42 +00002064
2065unlock:
2066 spin_unlock_bh(&br->multicast_lock);
2067
2068 return 0;
2069}
2070
Herbert Xub1951672010-02-27 19:41:51 +00002071int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2072{
Linus Lüssing6ae4ae82015-05-23 03:12:34 +02002073 int err = -EINVAL;
Herbert Xub1951672010-02-27 19:41:51 +00002074 u32 old;
Eric Dumazete8051682010-11-15 06:38:10 +00002075 struct net_bridge_mdb_htable *mdb;
Herbert Xub1951672010-02-27 19:41:51 +00002076
Curt Brunefe0d6922014-01-06 11:00:32 -08002077 spin_lock_bh(&br->multicast_lock);
Herbert Xub1951672010-02-27 19:41:51 +00002078 if (!is_power_of_2(val))
2079 goto unlock;
Eric Dumazete8051682010-11-15 06:38:10 +00002080
2081 mdb = mlock_dereference(br->mdb, br);
2082 if (mdb && val < mdb->size)
Herbert Xub1951672010-02-27 19:41:51 +00002083 goto unlock;
2084
2085 err = 0;
2086
2087 old = br->hash_max;
2088 br->hash_max = val;
2089
Eric Dumazete8051682010-11-15 06:38:10 +00002090 if (mdb) {
2091 if (mdb->old) {
Herbert Xub1951672010-02-27 19:41:51 +00002092 err = -EEXIST;
2093rollback:
2094 br->hash_max = old;
2095 goto unlock;
2096 }
2097
2098 err = br_mdb_rehash(&br->mdb, br->hash_max,
2099 br->hash_elasticity);
2100 if (err)
2101 goto rollback;
2102 }
2103
2104unlock:
Curt Brunefe0d6922014-01-06 11:00:32 -08002105 spin_unlock_bh(&br->multicast_lock);
Herbert Xub1951672010-02-27 19:41:51 +00002106
2107 return err;
2108}
Linus Lüssing07f8ac42014-06-07 18:26:28 +02002109
2110/**
2111 * br_multicast_list_adjacent - Returns snooped multicast addresses
2112 * @dev: The bridge port adjacent to which to retrieve addresses
2113 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2114 *
2115 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2116 * snooping feature on all bridge ports of dev's bridge device, excluding
2117 * the addresses from dev itself.
2118 *
2119 * Returns the number of items added to br_ip_list.
2120 *
2121 * Notes:
2122 * - br_ip_list needs to be initialized by caller
2123 * - br_ip_list might contain duplicates in the end
2124 * (needs to be taken care of by caller)
2125 * - br_ip_list needs to be freed by caller
2126 */
2127int br_multicast_list_adjacent(struct net_device *dev,
2128 struct list_head *br_ip_list)
2129{
2130 struct net_bridge *br;
2131 struct net_bridge_port *port;
2132 struct net_bridge_port_group *group;
2133 struct br_ip_list *entry;
2134 int count = 0;
2135
2136 rcu_read_lock();
2137 if (!br_ip_list || !br_port_exists(dev))
2138 goto unlock;
2139
2140 port = br_port_get_rcu(dev);
2141 if (!port || !port->br)
2142 goto unlock;
2143
2144 br = port->br;
2145
2146 list_for_each_entry_rcu(port, &br->port_list, list) {
2147 if (!port->dev || port->dev == dev)
2148 continue;
2149
2150 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2151 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2152 if (!entry)
2153 goto unlock;
2154
2155 entry->addr = group->addr;
2156 list_add(&entry->list, br_ip_list);
2157 count++;
2158 }
2159 }
2160
2161unlock:
2162 rcu_read_unlock();
2163 return count;
2164}
2165EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
Linus Lüssing2cd41432014-06-07 18:26:29 +02002166
2167/**
Linus Lüssingc34963e2014-07-07 05:41:17 +02002168 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2169 * @dev: The bridge port providing the bridge on which to check for a querier
2170 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2171 *
2172 * Checks whether the given interface has a bridge on top and if so returns
2173 * true if a valid querier exists anywhere on the bridged link layer.
2174 * Otherwise returns false.
2175 */
2176bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2177{
2178 struct net_bridge *br;
2179 struct net_bridge_port *port;
2180 struct ethhdr eth;
2181 bool ret = false;
2182
2183 rcu_read_lock();
2184 if (!br_port_exists(dev))
2185 goto unlock;
2186
2187 port = br_port_get_rcu(dev);
2188 if (!port || !port->br)
2189 goto unlock;
2190
2191 br = port->br;
2192
2193 memset(&eth, 0, sizeof(eth));
2194 eth.h_proto = htons(proto);
2195
2196 ret = br_multicast_querier_exists(br, &eth);
2197
2198unlock:
2199 rcu_read_unlock();
2200 return ret;
2201}
2202EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2203
2204/**
Linus Lüssing2cd41432014-06-07 18:26:29 +02002205 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2206 * @dev: The bridge port adjacent to which to check for a querier
2207 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2208 *
2209 * Checks whether the given interface has a bridge on top and if so returns
2210 * true if a selected querier is behind one of the other ports of this
2211 * bridge. Otherwise returns false.
2212 */
2213bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2214{
2215 struct net_bridge *br;
2216 struct net_bridge_port *port;
2217 bool ret = false;
2218
2219 rcu_read_lock();
2220 if (!br_port_exists(dev))
2221 goto unlock;
2222
2223 port = br_port_get_rcu(dev);
2224 if (!port || !port->br)
2225 goto unlock;
2226
2227 br = port->br;
2228
2229 switch (proto) {
2230 case ETH_P_IP:
2231 if (!timer_pending(&br->ip4_other_query.timer) ||
2232 rcu_dereference(br->ip4_querier.port) == port)
2233 goto unlock;
2234 break;
Linus Lüssing3993c4e2014-06-12 01:41:24 +02002235#if IS_ENABLED(CONFIG_IPV6)
Linus Lüssing2cd41432014-06-07 18:26:29 +02002236 case ETH_P_IPV6:
2237 if (!timer_pending(&br->ip6_other_query.timer) ||
2238 rcu_dereference(br->ip6_querier.port) == port)
2239 goto unlock;
2240 break;
Linus Lüssing3993c4e2014-06-12 01:41:24 +02002241#endif
Linus Lüssing2cd41432014-06-07 18:26:29 +02002242 default:
2243 goto unlock;
2244 }
2245
2246 ret = true;
2247unlock:
2248 rcu_read_unlock();
2249 return ret;
2250}
2251EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002252
2253static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07002254 const struct sk_buff *skb, u8 type, u8 dir)
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002255{
2256 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07002257 __be16 proto = skb->protocol;
2258 unsigned int t_len;
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002259
2260 u64_stats_update_begin(&pstats->syncp);
2261 switch (proto) {
2262 case htons(ETH_P_IP):
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07002263 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002264 switch (type) {
2265 case IGMP_HOST_MEMBERSHIP_REPORT:
2266 pstats->mstats.igmp_v1reports[dir]++;
2267 break;
2268 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2269 pstats->mstats.igmp_v2reports[dir]++;
2270 break;
2271 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2272 pstats->mstats.igmp_v3reports[dir]++;
2273 break;
2274 case IGMP_HOST_MEMBERSHIP_QUERY:
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07002275 if (t_len != sizeof(struct igmphdr)) {
2276 pstats->mstats.igmp_v3queries[dir]++;
2277 } else {
2278 unsigned int offset = skb_transport_offset(skb);
2279 struct igmphdr *ih, _ihdr;
2280
2281 ih = skb_header_pointer(skb, offset,
2282 sizeof(_ihdr), &_ihdr);
2283 if (!ih)
2284 break;
2285 if (!ih->code)
2286 pstats->mstats.igmp_v1queries[dir]++;
2287 else
2288 pstats->mstats.igmp_v2queries[dir]++;
2289 }
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002290 break;
2291 case IGMP_HOST_LEAVE_MESSAGE:
2292 pstats->mstats.igmp_leaves[dir]++;
2293 break;
2294 }
2295 break;
2296#if IS_ENABLED(CONFIG_IPV6)
2297 case htons(ETH_P_IPV6):
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07002298 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2299 sizeof(struct ipv6hdr);
2300 t_len -= skb_network_header_len(skb);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002301 switch (type) {
2302 case ICMPV6_MGM_REPORT:
2303 pstats->mstats.mld_v1reports[dir]++;
2304 break;
2305 case ICMPV6_MLD2_REPORT:
2306 pstats->mstats.mld_v2reports[dir]++;
2307 break;
2308 case ICMPV6_MGM_QUERY:
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07002309 if (t_len != sizeof(struct mld_msg))
2310 pstats->mstats.mld_v2queries[dir]++;
2311 else
2312 pstats->mstats.mld_v1queries[dir]++;
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002313 break;
2314 case ICMPV6_MGM_REDUCTION:
2315 pstats->mstats.mld_leaves[dir]++;
2316 break;
2317 }
2318 break;
2319#endif /* CONFIG_IPV6 */
2320 }
2321 u64_stats_update_end(&pstats->syncp);
2322}
2323
2324void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07002325 const struct sk_buff *skb, u8 type, u8 dir)
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002326{
2327 struct bridge_mcast_stats __percpu *stats;
2328
2329 /* if multicast_disabled is true then igmp type can't be set */
2330 if (!type || !br->multicast_stats_enabled)
2331 return;
2332
2333 if (p)
2334 stats = p->mcast_stats;
2335 else
2336 stats = br->mcast_stats;
2337 if (WARN_ON(!stats))
2338 return;
2339
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07002340 br_mcast_stats_add(stats, skb, type, dir);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002341}
2342
2343int br_multicast_init_stats(struct net_bridge *br)
2344{
2345 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2346 if (!br->mcast_stats)
2347 return -ENOMEM;
2348
2349 return 0;
2350}
2351
2352static void mcast_stats_add_dir(u64 *dst, u64 *src)
2353{
2354 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2355 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2356}
2357
2358void br_multicast_get_stats(const struct net_bridge *br,
2359 const struct net_bridge_port *p,
2360 struct br_mcast_stats *dest)
2361{
2362 struct bridge_mcast_stats __percpu *stats;
2363 struct br_mcast_stats tdst;
2364 int i;
2365
2366 memset(dest, 0, sizeof(*dest));
2367 if (p)
2368 stats = p->mcast_stats;
2369 else
2370 stats = br->mcast_stats;
2371 if (WARN_ON(!stats))
2372 return;
2373
2374 memset(&tdst, 0, sizeof(tdst));
2375 for_each_possible_cpu(i) {
2376 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2377 struct br_mcast_stats temp;
2378 unsigned int start;
2379
2380 do {
2381 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2382 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2383 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2384
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07002385 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2386 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2387 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002388 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2389 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2390 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2391 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2392 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2393
Nikolay Aleksandrova65056e2016-07-06 12:12:21 -07002394 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2395 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
Nikolay Aleksandrov1080ab92016-06-28 16:57:06 +02002396 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2397 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2398 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2399 tdst.mld_parse_errors += temp.mld_parse_errors;
2400 }
2401 memcpy(dest, &tdst, sizeof(*dest));
2402}