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bridge: Fix timer typo that may render snooping less effective
[thirdparty/kernel/stable.git] / net / bridge / br_multicast.c
CommitLineData
eb1d1641
HX		 1/*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <linux/err.h>
14#include <linux/if_ether.h>
15#include <linux/igmp.h>
16#include <linux/jhash.h>
17#include <linux/kernel.h>
b195167f 18#include <linux/log2.h>
eb1d1641
HX		 19#include <linux/netdevice.h>
20#include <linux/netfilter_bridge.h>
21#include <linux/random.h>
22#include <linux/rculist.h>
23#include <linux/skbuff.h>
24#include <linux/slab.h>
25#include <linux/timer.h>
26#include <net/ip.h>
08b202b6
YH		 27#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
28#include <net/ipv6.h>
29#include <net/mld.h>
30#include <net/addrconf.h>
d4c4f07d 31#include <net/ip6_checksum.h>
08b202b6 32#endif
eb1d1641
HX		 33
34#include "br_private.h"
35
e8051688
ED		 36#define mlock_dereference(X, br) \
37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
38
08b202b6
YH		 39#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40static inline int ipv6_is_local_multicast(const struct in6_addr *addr)
eb1d1641 41{
08b202b6
YH		 42 if (ipv6_addr_is_multicast(addr) &&
43 IPV6_ADDR_MC_SCOPE(addr) <= IPV6_ADDR_SCOPE_LINKLOCAL)
44 return 1;
45 return 0;
46}
47#endif
48
8ef2a9a5
YH		 49static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
50{
51 if (a->proto != b->proto)
52 return 0;
53 switch (a->proto) {
54 case htons(ETH_P_IP):
55 return a->u.ip4 == b->u.ip4;
08b202b6
YH		 56#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
57 case htons(ETH_P_IPV6):
58 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
59#endif
8ef2a9a5
YH		 60 }
61 return 0;
62}
63
64static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
eb1d1641 65{
0eae88f3 66 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
eb1d1641
HX		 67}
68
08b202b6
YH		 69#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
70static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
71 const struct in6_addr *ip)
72{
73 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
74}
75#endif
76
8ef2a9a5
YH		 77static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
78 struct br_ip *ip)
79{
80 switch (ip->proto) {
81 case htons(ETH_P_IP):
82 return __br_ip4_hash(mdb, ip->u.ip4);
08b202b6
YH		 83#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
84 case htons(ETH_P_IPV6):
85 return __br_ip6_hash(mdb, &ip->u.ip6);
86#endif
8ef2a9a5
YH		 87 }
88 return 0;
eb1d1641
HX		 89}
90
91static struct net_bridge_mdb_entry *__br_mdb_ip_get(
8ef2a9a5 92 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
eb1d1641
HX		 93{
94 struct net_bridge_mdb_entry *mp;
95 struct hlist_node *p;
96
49f5fcfd 97 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
8ef2a9a5 98 if (br_ip_equal(&mp->addr, dst))
eb1d1641
HX		 99 return mp;
100 }
101
102 return NULL;
103}
104
7f285fa7
HX		 105static struct net_bridge_mdb_entry *br_mdb_ip_get(
106 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
107{
108 if (!mdb)
109 return NULL;
110
111 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
112}
113
8ef2a9a5 114static struct net_bridge_mdb_entry *br_mdb_ip4_get(
eb1d1641
HX		 115 struct net_bridge_mdb_htable *mdb, __be32 dst)
116{
8ef2a9a5
YH		 117 struct br_ip br_dst;
118
119 br_dst.u.ip4 = dst;
120 br_dst.proto = htons(ETH_P_IP);
0821ec55 121
7f285fa7 122 return br_mdb_ip_get(mdb, &br_dst);
8ef2a9a5
YH		 123}
124
08b202b6
YH		 125#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
126static struct net_bridge_mdb_entry *br_mdb_ip6_get(
127 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
128{
129 struct br_ip br_dst;
0821ec55 130
08b202b6
YH		 131 ipv6_addr_copy(&br_dst.u.ip6, dst);
132 br_dst.proto = htons(ETH_P_IPV6);
133
7f285fa7 134 return br_mdb_ip_get(mdb, &br_dst);
08b202b6
YH		 135}
136#endif
137
eb1d1641
HX		 138struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
139 struct sk_buff *skb)
140{
e8051688 141 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
8ef2a9a5
YH		 142 struct br_ip ip;
143
7f285fa7 144 if (br->multicast_disabled)
eb1d1641
HX		 145 return NULL;
146
8ef2a9a5 147 if (BR_INPUT_SKB_CB(skb)->igmp)
eb1d1641
HX		 148 return NULL;
149
8ef2a9a5
YH		 150 ip.proto = skb->protocol;
151
eb1d1641
HX		 152 switch (skb->protocol) {
153 case htons(ETH_P_IP):
8ef2a9a5
YH		 154 ip.u.ip4 = ip_hdr(skb)->daddr;
155 break;
08b202b6
YH		 156#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
157 case htons(ETH_P_IPV6):
158 ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr);
159 break;
160#endif
8ef2a9a5
YH		 161 default:
162 return NULL;
eb1d1641
HX		 163 }
164
8ef2a9a5 165 return br_mdb_ip_get(mdb, &ip);
eb1d1641
HX		 166}
167
168static void br_mdb_free(struct rcu_head *head)
169{
170 struct net_bridge_mdb_htable *mdb =
171 container_of(head, struct net_bridge_mdb_htable, rcu);
172 struct net_bridge_mdb_htable *old = mdb->old;
173
174 mdb->old = NULL;
175 kfree(old->mhash);
176 kfree(old);
177}
178
179static int br_mdb_copy(struct net_bridge_mdb_htable *new,
180 struct net_bridge_mdb_htable *old,
181 int elasticity)
182{
183 struct net_bridge_mdb_entry *mp;
184 struct hlist_node *p;
185 int maxlen;
186 int len;
187 int i;
188
189 for (i = 0; i < old->max; i++)
190 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
191 hlist_add_head(&mp->hlist[new->ver],
8ef2a9a5 192 &new->mhash[br_ip_hash(new, &mp->addr)]);
eb1d1641
HX		 193
194 if (!elasticity)
195 return 0;
196
197 maxlen = 0;
198 for (i = 0; i < new->max; i++) {
199 len = 0;
200 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
201 len++;
202 if (len > maxlen)
203 maxlen = len;
204 }
205
206 return maxlen > elasticity ? -EINVAL : 0;
207}
208
209static void br_multicast_free_pg(struct rcu_head *head)
210{
211 struct net_bridge_port_group *p =
212 container_of(head, struct net_bridge_port_group, rcu);
213
214 kfree(p);
215}
216
217static void br_multicast_free_group(struct rcu_head *head)
218{
219 struct net_bridge_mdb_entry *mp =
220 container_of(head, struct net_bridge_mdb_entry, rcu);
221
222 kfree(mp);
223}
224
225static void br_multicast_group_expired(unsigned long data)
226{
227 struct net_bridge_mdb_entry *mp = (void *)data;
228 struct net_bridge *br = mp->br;
229 struct net_bridge_mdb_htable *mdb;
230
231 spin_lock(&br->multicast_lock);
232 if (!netif_running(br->dev) || timer_pending(&mp->timer))
233 goto out;
234
235 if (!hlist_unhashed(&mp->mglist))
236 hlist_del_init(&mp->mglist);
237
238 if (mp->ports)
239 goto out;
240
e8051688
ED		 241 mdb = mlock_dereference(br->mdb, br);
242
eb1d1641
HX		 243 hlist_del_rcu(&mp->hlist[mdb->ver]);
244 mdb->size--;
245
246 del_timer(&mp->query_timer);
247 call_rcu_bh(&mp->rcu, br_multicast_free_group);
248
249out:
250 spin_unlock(&br->multicast_lock);
251}
252
253static void br_multicast_del_pg(struct net_bridge *br,
254 struct net_bridge_port_group *pg)
255{
e8051688 256 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 257 struct net_bridge_mdb_entry *mp;
258 struct net_bridge_port_group *p;
e8051688
ED		 259 struct net_bridge_port_group __rcu **pp;
260
261 mdb = mlock_dereference(br->mdb, br);
eb1d1641 262
8ef2a9a5 263 mp = br_mdb_ip_get(mdb, &pg->addr);
eb1d1641
HX		 264 if (WARN_ON(!mp))
265 return;
266
e8051688
ED		 267 for (pp = &mp->ports;
268 (p = mlock_dereference(*pp, br)) != NULL;
269 pp = &p->next) {
eb1d1641
HX		 270 if (p != pg)
271 continue;
272
83f6a740 273 rcu_assign_pointer(*pp, p->next);
eb1d1641
HX		 274 hlist_del_init(&p->mglist);
275 del_timer(&p->timer);
276 del_timer(&p->query_timer);
277 call_rcu_bh(&p->rcu, br_multicast_free_pg);
278
279 if (!mp->ports && hlist_unhashed(&mp->mglist) &&
280 netif_running(br->dev))
281 mod_timer(&mp->timer, jiffies);
282
283 return;
284 }
285
286 WARN_ON(1);
287}
288
289static void br_multicast_port_group_expired(unsigned long data)
290{
291 struct net_bridge_port_group *pg = (void *)data;
292 struct net_bridge *br = pg->port->br;
293
294 spin_lock(&br->multicast_lock);
295 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
296 hlist_unhashed(&pg->mglist))
297 goto out;
298
299 br_multicast_del_pg(br, pg);
300
301out:
302 spin_unlock(&br->multicast_lock);
303}
304
e8051688 305static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
eb1d1641
HX		 306 int elasticity)
307{
e8051688 308 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
eb1d1641
HX		 309 struct net_bridge_mdb_htable *mdb;
310 int err;
311
312 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
313 if (!mdb)
314 return -ENOMEM;
315
316 mdb->max = max;
317 mdb->old = old;
318
319 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
320 if (!mdb->mhash) {
321 kfree(mdb);
322 return -ENOMEM;
323 }
324
325 mdb->size = old ? old->size : 0;
326 mdb->ver = old ? old->ver ^ 1 : 0;
327
328 if (!old || elasticity)
329 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
330 else
331 mdb->secret = old->secret;
332
333 if (!old)
334 goto out;
335
336 err = br_mdb_copy(mdb, old, elasticity);
337 if (err) {
338 kfree(mdb->mhash);
339 kfree(mdb);
340 return err;
341 }
342
343 call_rcu_bh(&mdb->rcu, br_mdb_free);
344
345out:
346 rcu_assign_pointer(*mdbp, mdb);
347
348 return 0;
349}
350
8ef2a9a5
YH		 351static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
352 __be32 group)
eb1d1641
HX		 353{
354 struct sk_buff *skb;
355 struct igmphdr *ih;
356 struct ethhdr *eth;
357 struct iphdr *iph;
358
359 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
360 sizeof(*ih) + 4);
361 if (!skb)
362 goto out;
363
364 skb->protocol = htons(ETH_P_IP);
365
366 skb_reset_mac_header(skb);
367 eth = eth_hdr(skb);
368
369 memcpy(eth->h_source, br->dev->dev_addr, 6);
370 eth->h_dest[0] = 1;
371 eth->h_dest[1] = 0;
372 eth->h_dest[2] = 0x5e;
373 eth->h_dest[3] = 0;
374 eth->h_dest[4] = 0;
375 eth->h_dest[5] = 1;
376 eth->h_proto = htons(ETH_P_IP);
377 skb_put(skb, sizeof(*eth));
378
379 skb_set_network_header(skb, skb->len);
380 iph = ip_hdr(skb);
381
382 iph->version = 4;
383 iph->ihl = 6;
384 iph->tos = 0xc0;
385 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
386 iph->id = 0;
387 iph->frag_off = htons(IP_DF);
388 iph->ttl = 1;
389 iph->protocol = IPPROTO_IGMP;
390 iph->saddr = 0;
391 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
392 ((u8 *)&iph[1])[0] = IPOPT_RA;
393 ((u8 *)&iph[1])[1] = 4;
394 ((u8 *)&iph[1])[2] = 0;
395 ((u8 *)&iph[1])[3] = 0;
396 ip_send_check(iph);
397 skb_put(skb, 24);
398
399 skb_set_transport_header(skb, skb->len);
400 ih = igmp_hdr(skb);
401 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
402 ih->code = (group ? br->multicast_last_member_interval :
403 br->multicast_query_response_interval) /
404 (HZ / IGMP_TIMER_SCALE);
405 ih->group = group;
406 ih->csum = 0;
407 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
408 skb_put(skb, sizeof(*ih));
409
410 __skb_pull(skb, sizeof(*eth));
411
412out:
413 return skb;
414}
415
08b202b6
YH		 416#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
417static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
418 struct in6_addr *group)
419{
420 struct sk_buff *skb;
421 struct ipv6hdr *ip6h;
422 struct mld_msg *mldq;
423 struct ethhdr *eth;
424 u8 *hopopt;
425 unsigned long interval;
426
427 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
428 8 + sizeof(*mldq));
429 if (!skb)
430 goto out;
431
432 skb->protocol = htons(ETH_P_IPV6);
433
434 /* Ethernet header */
435 skb_reset_mac_header(skb);
436 eth = eth_hdr(skb);
437
438 memcpy(eth->h_source, br->dev->dev_addr, 6);
439 ipv6_eth_mc_map(group, eth->h_dest);
440 eth->h_proto = htons(ETH_P_IPV6);
441 skb_put(skb, sizeof(*eth));
442
443 /* IPv6 header + HbH option */
444 skb_set_network_header(skb, skb->len);
445 ip6h = ipv6_hdr(skb);
446
447 *(__force __be32 *)ip6h = htonl(0x60000000);
76d66158 448 ip6h->payload_len = htons(8 + sizeof(*mldq));
08b202b6
YH		 449 ip6h->nexthdr = IPPROTO_HOPOPTS;
450 ip6h->hop_limit = 1;
451 ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0);
452 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
453
454 hopopt = (u8 *)(ip6h + 1);
455 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
456 hopopt[1] = 0; /* length of HbH */
457 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
458 hopopt[3] = 2; /* Length of RA Option */
459 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
460 hopopt[5] = 0;
461 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */
462 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */
463
464 skb_put(skb, sizeof(*ip6h) + 8);
465
466 /* ICMPv6 */
467 skb_set_transport_header(skb, skb->len);
468 mldq = (struct mld_msg *) icmp6_hdr(skb);
469
470 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
471 br->multicast_query_response_interval;
472
473 mldq->mld_type = ICMPV6_MGM_QUERY;
474 mldq->mld_code = 0;
475 mldq->mld_cksum = 0;
476 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
477 mldq->mld_reserved = 0;
478 ipv6_addr_copy(&mldq->mld_mca, group);
479
480 /* checksum */
481 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
482 sizeof(*mldq), IPPROTO_ICMPV6,
483 csum_partial(mldq,
484 sizeof(*mldq), 0));
485 skb_put(skb, sizeof(*mldq));
486
487 __skb_pull(skb, sizeof(*eth));
488
489out:
490 return skb;
491}
492#endif
493
8ef2a9a5
YH		 494static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
495 struct br_ip *addr)
496{
497 switch (addr->proto) {
498 case htons(ETH_P_IP):
499 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
08b202b6
YH		 500#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
501 case htons(ETH_P_IPV6):
502 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
503#endif
8ef2a9a5
YH		 504 }
505 return NULL;
506}
507
eb1d1641
HX		 508static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
509{
510 struct net_bridge *br = mp->br;
511 struct sk_buff *skb;
512
8ef2a9a5 513 skb = br_multicast_alloc_query(br, &mp->addr);
eb1d1641
HX		 514 if (!skb)
515 goto timer;
516
517 netif_rx(skb);
518
519timer:
520 if (++mp->queries_sent < br->multicast_last_member_count)
521 mod_timer(&mp->query_timer,
522 jiffies + br->multicast_last_member_interval);
523}
524
525static void br_multicast_group_query_expired(unsigned long data)
526{
527 struct net_bridge_mdb_entry *mp = (void *)data;
528 struct net_bridge *br = mp->br;
529
530 spin_lock(&br->multicast_lock);
531 if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
532 mp->queries_sent >= br->multicast_last_member_count)
533 goto out;
534
535 br_multicast_send_group_query(mp);
536
537out:
538 spin_unlock(&br->multicast_lock);
539}
540
541static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
542{
543 struct net_bridge_port *port = pg->port;
544 struct net_bridge *br = port->br;
545 struct sk_buff *skb;
546
8ef2a9a5 547 skb = br_multicast_alloc_query(br, &pg->addr);
eb1d1641
HX		 548 if (!skb)
549 goto timer;
550
551 br_deliver(port, skb);
552
553timer:
554 if (++pg->queries_sent < br->multicast_last_member_count)
555 mod_timer(&pg->query_timer,
556 jiffies + br->multicast_last_member_interval);
557}
558
559static void br_multicast_port_group_query_expired(unsigned long data)
560{
561 struct net_bridge_port_group *pg = (void *)data;
562 struct net_bridge_port *port = pg->port;
563 struct net_bridge *br = port->br;
564
565 spin_lock(&br->multicast_lock);
566 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
567 pg->queries_sent >= br->multicast_last_member_count)
568 goto out;
569
570 br_multicast_send_port_group_query(pg);
571
572out:
573 spin_unlock(&br->multicast_lock);
574}
575
576static struct net_bridge_mdb_entry *br_multicast_get_group(
8ef2a9a5
YH		 577 struct net_bridge *br, struct net_bridge_port *port,
578 struct br_ip *group, int hash)
eb1d1641 579{
e8051688 580 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 581 struct net_bridge_mdb_entry *mp;
582 struct hlist_node *p;
583 unsigned count = 0;
584 unsigned max;
585 int elasticity;
586 int err;
587
e8051688 588 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 589 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
590 count++;
8ef2a9a5 591 if (unlikely(br_ip_equal(group, &mp->addr)))
eb1d1641 592 return mp;
eb1d1641
HX		 593 }
594
595 elasticity = 0;
596 max = mdb->max;
597
598 if (unlikely(count > br->hash_elasticity && count)) {
599 if (net_ratelimit())
28a16c97 600 br_info(br, "Multicast hash table "
601 "chain limit reached: %s\n",
602 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 603
604 elasticity = br->hash_elasticity;
605 }
606
607 if (mdb->size >= max) {
608 max *= 2;
609 if (unlikely(max >= br->hash_max)) {
28a16c97 610 br_warn(br, "Multicast hash table maximum "
611 "reached, disabling snooping: %s, %d\n",
612 port ? port->dev->name : br->dev->name, max);
eb1d1641
HX		 613 err = -E2BIG;
614disable:
615 br->multicast_disabled = 1;
616 goto err;
617 }
618 }
619
620 if (max > mdb->max || elasticity) {
621 if (mdb->old) {
622 if (net_ratelimit())
28a16c97 623 br_info(br, "Multicast hash table "
624 "on fire: %s\n",
625 port ? port->dev->name : br->dev->name);
eb1d1641
HX		 626 err = -EEXIST;
627 goto err;
628 }
629
630 err = br_mdb_rehash(&br->mdb, max, elasticity);
631 if (err) {
28a16c97 632 br_warn(br, "Cannot rehash multicast "
633 "hash table, disabling snooping: %s, %d, %d\n",
634 port ? port->dev->name : br->dev->name,
635 mdb->size, err);
eb1d1641
HX		 636 goto disable;
637 }
638
639 err = -EAGAIN;
640 goto err;
641 }
642
643 return NULL;
644
645err:
646 mp = ERR_PTR(err);
647 return mp;
648}
649
650static struct net_bridge_mdb_entry *br_multicast_new_group(
8ef2a9a5
YH		 651 struct net_bridge *br, struct net_bridge_port *port,
652 struct br_ip *group)
eb1d1641 653{
e8051688 654 struct net_bridge_mdb_htable *mdb;
eb1d1641
HX		 655 struct net_bridge_mdb_entry *mp;
656 int hash;
4c0833bc 657 int err;
eb1d1641 658
e8051688 659 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641 660 if (!mdb) {
4c0833bc
TK		 661 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
662 if (err)
663 return ERR_PTR(err);
eb1d1641
HX		 664 goto rehash;
665 }
666
667 hash = br_ip_hash(mdb, group);
668 mp = br_multicast_get_group(br, port, group, hash);
669 switch (PTR_ERR(mp)) {
670 case 0:
671 break;
672
673 case -EAGAIN:
674rehash:
e8051688 675 mdb = rcu_dereference_protected(br->mdb, 1);
eb1d1641
HX		 676 hash = br_ip_hash(mdb, group);
677 break;
678
679 default:
680 goto out;
681 }
682
683 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
684 if (unlikely(!mp))
4c0833bc 685 return ERR_PTR(-ENOMEM);
eb1d1641
HX		 686
687 mp->br = br;
8ef2a9a5 688 mp->addr = *group;
eb1d1641
HX		 689 setup_timer(&mp->timer, br_multicast_group_expired,
690 (unsigned long)mp);
691 setup_timer(&mp->query_timer, br_multicast_group_query_expired,
692 (unsigned long)mp);
693
694 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
695 mdb->size++;
696
697out:
698 return mp;
699}
700
701static int br_multicast_add_group(struct net_bridge *br,
8ef2a9a5
YH		 702 struct net_bridge_port *port,
703 struct br_ip *group)
eb1d1641
HX		 704{
705 struct net_bridge_mdb_entry *mp;
706 struct net_bridge_port_group *p;
e8051688 707 struct net_bridge_port_group __rcu **pp;
eb1d1641
HX		 708 unsigned long now = jiffies;
709 int err;
710
eb1d1641
HX		 711 spin_lock(&br->multicast_lock);
712 if (!netif_running(br->dev) ||
713 (port && port->state == BR_STATE_DISABLED))
714 goto out;
715
716 mp = br_multicast_new_group(br, port, group);
717 err = PTR_ERR(mp);
4c0833bc 718 if (IS_ERR(mp))
eb1d1641
HX		 719 goto err;
720
721 if (!port) {
6b0d6a9b
HX		 722 if (hlist_unhashed(&mp->mglist))
723 hlist_add_head(&mp->mglist, &br->mglist);
eb1d1641
HX		 724 mod_timer(&mp->timer, now + br->multicast_membership_interval);
725 goto out;
726 }
727
e8051688
ED		 728 for (pp = &mp->ports;
729 (p = mlock_dereference(*pp, br)) != NULL;
730 pp = &p->next) {
eb1d1641
HX		 731 if (p->port == port)
732 goto found;
733 if ((unsigned long)p->port < (unsigned long)port)
734 break;
735 }
736
737 p = kzalloc(sizeof(*p), GFP_ATOMIC);
738 err = -ENOMEM;
739 if (unlikely(!p))
740 goto err;
741
8ef2a9a5 742 p->addr = *group;
eb1d1641
HX		 743 p->port = port;
744 p->next = *pp;
745 hlist_add_head(&p->mglist, &port->mglist);
746 setup_timer(&p->timer, br_multicast_port_group_expired,
747 (unsigned long)p);
748 setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
749 (unsigned long)p);
750
751 rcu_assign_pointer(*pp, p);
752
753found:
754 mod_timer(&p->timer, now + br->multicast_membership_interval);
755out:
756 err = 0;
757
758err:
759 spin_unlock(&br->multicast_lock);
760 return err;
761}
762
8ef2a9a5
YH		 763static int br_ip4_multicast_add_group(struct net_bridge *br,
764 struct net_bridge_port *port,
765 __be32 group)
766{
767 struct br_ip br_group;
768
769 if (ipv4_is_local_multicast(group))
770 return 0;
771
772 br_group.u.ip4 = group;
773 br_group.proto = htons(ETH_P_IP);
774
775 return br_multicast_add_group(br, port, &br_group);
776}
777
08b202b6
YH		 778#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
779static int br_ip6_multicast_add_group(struct net_bridge *br,
780 struct net_bridge_port *port,
781 const struct in6_addr *group)
782{
783 struct br_ip br_group;
784
785 if (ipv6_is_local_multicast(group))
786 return 0;
787
788 ipv6_addr_copy(&br_group.u.ip6, group);
789 br_group.proto = htons(ETH_P_IP);
790
791 return br_multicast_add_group(br, port, &br_group);
792}
793#endif
794
eb1d1641
HX		 795static void br_multicast_router_expired(unsigned long data)
796{
797 struct net_bridge_port *port = (void *)data;
798 struct net_bridge *br = port->br;
799
800 spin_lock(&br->multicast_lock);
801 if (port->multicast_router != 1 ||
802 timer_pending(&port->multicast_router_timer) ||
803 hlist_unhashed(&port->rlist))
804 goto out;
805
806 hlist_del_init_rcu(&port->rlist);
807
808out:
809 spin_unlock(&br->multicast_lock);
810}
811
812static void br_multicast_local_router_expired(unsigned long data)
813{
814}
815
8ef2a9a5
YH		 816static void __br_multicast_send_query(struct net_bridge *br,
817 struct net_bridge_port *port,
818 struct br_ip *ip)
eb1d1641 819{
eb1d1641
HX		 820 struct sk_buff *skb;
821
8ef2a9a5 822 skb = br_multicast_alloc_query(br, ip);
eb1d1641 823 if (!skb)
8ef2a9a5 824 return;
eb1d1641
HX		 825
826 if (port) {
827 __skb_push(skb, sizeof(struct ethhdr));
828 skb->dev = port->dev;
713aefa3 829 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
eb1d1641
HX		 830 dev_queue_xmit);
831 } else
832 netif_rx(skb);
8ef2a9a5
YH		 833}
834
835static void br_multicast_send_query(struct net_bridge *br,
836 struct net_bridge_port *port, u32 sent)
837{
838 unsigned long time;
839 struct br_ip br_group;
840
841 if (!netif_running(br->dev) || br->multicast_disabled ||
842 timer_pending(&br->multicast_querier_timer))
843 return;
844
08b202b6
YH		 845 memset(&br_group.u, 0, sizeof(br_group.u));
846
8ef2a9a5 847 br_group.proto = htons(ETH_P_IP);
08b202b6 848 __br_multicast_send_query(br, port, &br_group);
8ef2a9a5 849
08b202b6
YH		 850#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
851 br_group.proto = htons(ETH_P_IPV6);
8ef2a9a5 852 __br_multicast_send_query(br, port, &br_group);
08b202b6 853#endif
eb1d1641 854
eb1d1641
HX		 855 time = jiffies;
856 time += sent < br->multicast_startup_query_count ?
857 br->multicast_startup_query_interval :
858 br->multicast_query_interval;
859 mod_timer(port ? &port->multicast_query_timer :
860 &br->multicast_query_timer, time);
861}
862
863static void br_multicast_port_query_expired(unsigned long data)
864{
865 struct net_bridge_port *port = (void *)data;
866 struct net_bridge *br = port->br;
867
868 spin_lock(&br->multicast_lock);
02a780c0
DC		 869 if (port->state == BR_STATE_DISABLED ||
870 port->state == BR_STATE_BLOCKING)
eb1d1641
HX		 871 goto out;
872
873 if (port->multicast_startup_queries_sent <
874 br->multicast_startup_query_count)
875 port->multicast_startup_queries_sent++;
876
877 br_multicast_send_query(port->br, port,
878 port->multicast_startup_queries_sent);
879
880out:
881 spin_unlock(&br->multicast_lock);
882}
883
884void br_multicast_add_port(struct net_bridge_port *port)
885{
886 port->multicast_router = 1;
887
888 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
889 (unsigned long)port);
890 setup_timer(&port->multicast_query_timer,
891 br_multicast_port_query_expired, (unsigned long)port);
892}
893
894void br_multicast_del_port(struct net_bridge_port *port)
895{
896 del_timer_sync(&port->multicast_router_timer);
897}
898
561f1103
HX		 899static void __br_multicast_enable_port(struct net_bridge_port *port)
900{
901 port->multicast_startup_queries_sent = 0;
902
903 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
904 del_timer(&port->multicast_query_timer))
905 mod_timer(&port->multicast_query_timer, jiffies);
906}
907
eb1d1641
HX		 908void br_multicast_enable_port(struct net_bridge_port *port)
909{
910 struct net_bridge *br = port->br;
911
912 spin_lock(&br->multicast_lock);
913 if (br->multicast_disabled || !netif_running(br->dev))
914 goto out;
915
561f1103 916 __br_multicast_enable_port(port);
eb1d1641
HX		 917
918out:
919 spin_unlock(&br->multicast_lock);
920}
921
922void br_multicast_disable_port(struct net_bridge_port *port)
923{
924 struct net_bridge *br = port->br;
925 struct net_bridge_port_group *pg;
926 struct hlist_node *p, *n;
927
928 spin_lock(&br->multicast_lock);
929 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
930 br_multicast_del_pg(br, pg);
931
932 if (!hlist_unhashed(&port->rlist))
933 hlist_del_init_rcu(&port->rlist);
934 del_timer(&port->multicast_router_timer);
935 del_timer(&port->multicast_query_timer);
936 spin_unlock(&br->multicast_lock);
937}
938
8ef2a9a5
YH		 939static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
940 struct net_bridge_port *port,
941 struct sk_buff *skb)
eb1d1641
HX		 942{
943 struct igmpv3_report *ih;
944 struct igmpv3_grec *grec;
945 int i;
946 int len;
947 int num;
948 int type;
949 int err = 0;
950 __be32 group;
951
952 if (!pskb_may_pull(skb, sizeof(*ih)))
953 return -EINVAL;
954
955 ih = igmpv3_report_hdr(skb);
956 num = ntohs(ih->ngrec);
957 len = sizeof(*ih);
958
959 for (i = 0; i < num; i++) {
960 len += sizeof(*grec);
961 if (!pskb_may_pull(skb, len))
962 return -EINVAL;
963
fd218cf9 964 grec = (void *)(skb->data + len - sizeof(*grec));
eb1d1641
HX		 965 group = grec->grec_mca;
966 type = grec->grec_type;
967
8eabf95c 968 len += ntohs(grec->grec_nsrcs) * 4;
eb1d1641
HX		 969 if (!pskb_may_pull(skb, len))
970 return -EINVAL;
971
972 /* We treat this as an IGMPv2 report for now. */
973 switch (type) {
974 case IGMPV3_MODE_IS_INCLUDE:
975 case IGMPV3_MODE_IS_EXCLUDE:
976 case IGMPV3_CHANGE_TO_INCLUDE:
977 case IGMPV3_CHANGE_TO_EXCLUDE:
978 case IGMPV3_ALLOW_NEW_SOURCES:
979 case IGMPV3_BLOCK_OLD_SOURCES:
980 break;
981
982 default:
983 continue;
984 }
985
8ef2a9a5 986 err = br_ip4_multicast_add_group(br, port, group);
eb1d1641
HX		 987 if (err)
988 break;
989 }
990
991 return err;
992}
993
08b202b6
YH		 994#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
995static int br_ip6_multicast_mld2_report(struct net_bridge *br,
996 struct net_bridge_port *port,
997 struct sk_buff *skb)
998{
999 struct icmp6hdr *icmp6h;
1000 struct mld2_grec *grec;
1001 int i;
1002 int len;
1003 int num;
1004 int err = 0;
1005
1006 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1007 return -EINVAL;
1008
1009 icmp6h = icmp6_hdr(skb);
1010 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1011 len = sizeof(*icmp6h);
1012
1013 for (i = 0; i < num; i++) {
1014 __be16 *nsrcs, _nsrcs;
1015
1016 nsrcs = skb_header_pointer(skb,
1017 len + offsetof(struct mld2_grec,
1018 grec_mca),
1019 sizeof(_nsrcs), &_nsrcs);
1020 if (!nsrcs)
1021 return -EINVAL;
1022
1023 if (!pskb_may_pull(skb,
1024 len + sizeof(*grec) +
1025 sizeof(struct in6_addr) * (*nsrcs)))
1026 return -EINVAL;
1027
1028 grec = (struct mld2_grec *)(skb->data + len);
1029 len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs);
1030
1031 /* We treat these as MLDv1 reports for now. */
1032 switch (grec->grec_type) {
1033 case MLD2_MODE_IS_INCLUDE:
1034 case MLD2_MODE_IS_EXCLUDE:
1035 case MLD2_CHANGE_TO_INCLUDE:
1036 case MLD2_CHANGE_TO_EXCLUDE:
1037 case MLD2_ALLOW_NEW_SOURCES:
1038 case MLD2_BLOCK_OLD_SOURCES:
1039 break;
1040
1041 default:
1042 continue;
1043 }
1044
1045 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
1046 if (!err)
1047 break;
1048 }
1049
1050 return err;
1051}
1052#endif
1053
7e80c124 1054/*
1055 * Add port to rotuer_list
1056 * list is maintained ordered by pointer value
1057 * and locked by br->multicast_lock and RCU
1058 */
0909e117
HX		 1059static void br_multicast_add_router(struct net_bridge *br,
1060 struct net_bridge_port *port)
1061{
dcdca2c4 1062 struct net_bridge_port *p;
7e80c124 1063 struct hlist_node *n, *slot = NULL;
dcdca2c4 1064
709b9326 1065 hlist_for_each_entry(p, n, &br->router_list, rlist) {
7e80c124 1066 if ((unsigned long) port >= (unsigned long) p)
1067 break;
1068 slot = n;
dcdca2c4 1069 }
1070
7e80c124 1071 if (slot)
1072 hlist_add_after_rcu(slot, &port->rlist);
dcdca2c4 1073 else
1074 hlist_add_head_rcu(&port->rlist, &br->router_list);
0909e117
HX		 1075}
1076
eb1d1641
HX		 1077static void br_multicast_mark_router(struct net_bridge *br,
1078 struct net_bridge_port *port)
1079{
1080 unsigned long now = jiffies;
eb1d1641
HX		 1081
1082 if (!port) {
1083 if (br->multicast_router == 1)
1084 mod_timer(&br->multicast_router_timer,
1085 now + br->multicast_querier_interval);
1086 return;
1087 }
1088
1089 if (port->multicast_router != 1)
1090 return;
1091
1092 if (!hlist_unhashed(&port->rlist))
1093 goto timer;
1094
0909e117 1095 br_multicast_add_router(br, port);
eb1d1641
HX		 1096
1097timer:
1098 mod_timer(&port->multicast_router_timer,
1099 now + br->multicast_querier_interval);
1100}
1101
1102static void br_multicast_query_received(struct net_bridge *br,
1103 struct net_bridge_port *port,
8ef2a9a5 1104 int saddr)
eb1d1641
HX		 1105{
1106 if (saddr)
1107 mod_timer(&br->multicast_querier_timer,
1108 jiffies + br->multicast_querier_interval);
1109 else if (timer_pending(&br->multicast_querier_timer))
1110 return;
1111
1112 br_multicast_mark_router(br, port);
1113}
1114
8ef2a9a5
YH		 1115static int br_ip4_multicast_query(struct net_bridge *br,
1116 struct net_bridge_port *port,
1117 struct sk_buff *skb)
eb1d1641
HX		 1118{
1119 struct iphdr *iph = ip_hdr(skb);
1120 struct igmphdr *ih = igmp_hdr(skb);
1121 struct net_bridge_mdb_entry *mp;
1122 struct igmpv3_query *ih3;
1123 struct net_bridge_port_group *p;
e8051688 1124 struct net_bridge_port_group __rcu **pp;
eb1d1641
HX		 1125 unsigned long max_delay;
1126 unsigned long now = jiffies;
1127 __be32 group;
bec68ff1 1128 int err = 0;
eb1d1641
HX		 1129
1130 spin_lock(&br->multicast_lock);
1131 if (!netif_running(br->dev) ||
1132 (port && port->state == BR_STATE_DISABLED))
1133 goto out;
1134
8ef2a9a5 1135 br_multicast_query_received(br, port, !!iph->saddr);
eb1d1641
HX		 1136
1137 group = ih->group;
1138
1139 if (skb->len == sizeof(*ih)) {
1140 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1141
1142 if (!max_delay) {
1143 max_delay = 10 * HZ;
1144 group = 0;
1145 }
1146 } else {
bec68ff1
YH		 1147 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1148 err = -EINVAL;
1149 goto out;
1150 }
eb1d1641
HX		 1151
1152 ih3 = igmpv3_query_hdr(skb);
1153 if (ih3->nsrcs)
bec68ff1 1154 goto out;
eb1d1641 1155
0ba8c9ec
YH		 1156 max_delay = ih3->code ?
1157 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
eb1d1641
HX		 1158 }
1159
1160 if (!group)
1161 goto out;
1162
e8051688 1163 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
eb1d1641
HX		 1164 if (!mp)
1165 goto out;
1166
1167 max_delay *= br->multicast_last_member_count;
1168
1169 if (!hlist_unhashed(&mp->mglist) &&
1170 (timer_pending(&mp->timer) ?
1171 time_after(mp->timer.expires, now + max_delay) :
1172 try_to_del_timer_sync(&mp->timer) >= 0))
1173 mod_timer(&mp->timer, now + max_delay);
1174
e8051688
ED		 1175 for (pp = &mp->ports;
1176 (p = mlock_dereference(*pp, br)) != NULL;
1177 pp = &p->next) {
eb1d1641
HX		 1178 if (timer_pending(&p->timer) ?
1179 time_after(p->timer.expires, now + max_delay) :
1180 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1181 mod_timer(&p->timer, now + max_delay);
eb1d1641
HX		 1182 }
1183
1184out:
1185 spin_unlock(&br->multicast_lock);
bec68ff1 1186 return err;
eb1d1641
HX		 1187}
1188
08b202b6
YH		 1189#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1190static int br_ip6_multicast_query(struct net_bridge *br,
1191 struct net_bridge_port *port,
1192 struct sk_buff *skb)
1193{
1194 struct ipv6hdr *ip6h = ipv6_hdr(skb);
1195 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1196 struct net_bridge_mdb_entry *mp;
1197 struct mld2_query *mld2q;
e8051688
ED		 1198 struct net_bridge_port_group *p;
1199 struct net_bridge_port_group __rcu **pp;
08b202b6
YH		 1200 unsigned long max_delay;
1201 unsigned long now = jiffies;
1202 struct in6_addr *group = NULL;
1203 int err = 0;
1204
1205 spin_lock(&br->multicast_lock);
1206 if (!netif_running(br->dev) ||
1207 (port && port->state == BR_STATE_DISABLED))
1208 goto out;
1209
1210 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1211
1212 if (skb->len == sizeof(*mld)) {
1213 if (!pskb_may_pull(skb, sizeof(*mld))) {
1214 err = -EINVAL;
1215 goto out;
1216 }
1217 mld = (struct mld_msg *) icmp6_hdr(skb);
1218 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
1219 if (max_delay)
1220 group = &mld->mld_mca;
1221 } else if (skb->len >= sizeof(*mld2q)) {
1222 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1223 err = -EINVAL;
1224 goto out;
1225 }
1226 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1227 if (!mld2q->mld2q_nsrcs)
1228 group = &mld2q->mld2q_mca;
1229 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1230 }
1231
1232 if (!group)
1233 goto out;
1234
e8051688 1235 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
08b202b6
YH		 1236 if (!mp)
1237 goto out;
1238
1239 max_delay *= br->multicast_last_member_count;
1240 if (!hlist_unhashed(&mp->mglist) &&
1241 (timer_pending(&mp->timer) ?
1242 time_after(mp->timer.expires, now + max_delay) :
1243 try_to_del_timer_sync(&mp->timer) >= 0))
1244 mod_timer(&mp->timer, now + max_delay);
1245
e8051688
ED		 1246 for (pp = &mp->ports;
1247 (p = mlock_dereference(*pp, br)) != NULL;
1248 pp = &p->next) {
08b202b6
YH		 1249 if (timer_pending(&p->timer) ?
1250 time_after(p->timer.expires, now + max_delay) :
1251 try_to_del_timer_sync(&p->timer) >= 0)
24f9cdcb 1252 mod_timer(&p->timer, now + max_delay);
08b202b6
YH		 1253 }
1254
1255out:
1256 spin_unlock(&br->multicast_lock);
1257 return err;
1258}
1259#endif
1260
eb1d1641
HX		 1261static void br_multicast_leave_group(struct net_bridge *br,
1262 struct net_bridge_port *port,
8ef2a9a5 1263 struct br_ip *group)
eb1d1641
HX		 1264{
1265 struct net_bridge_mdb_htable *mdb;
1266 struct net_bridge_mdb_entry *mp;
1267 struct net_bridge_port_group *p;
1268 unsigned long now;
1269 unsigned long time;
1270
eb1d1641
HX		 1271 spin_lock(&br->multicast_lock);
1272 if (!netif_running(br->dev) ||
1273 (port && port->state == BR_STATE_DISABLED) ||
1274 timer_pending(&br->multicast_querier_timer))
1275 goto out;
1276
e8051688 1277 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1278 mp = br_mdb_ip_get(mdb, group);
1279 if (!mp)
1280 goto out;
1281
1282 now = jiffies;
1283 time = now + br->multicast_last_member_count *
1284 br->multicast_last_member_interval;
1285
1286 if (!port) {
1287 if (!hlist_unhashed(&mp->mglist) &&
1288 (timer_pending(&mp->timer) ?
1289 time_after(mp->timer.expires, time) :
1290 try_to_del_timer_sync(&mp->timer) >= 0)) {
1291 mod_timer(&mp->timer, time);
1292
1293 mp->queries_sent = 0;
1294 mod_timer(&mp->query_timer, now);
1295 }
1296
1297 goto out;
1298 }
1299
e8051688
ED		 1300 for (p = mlock_dereference(mp->ports, br);
1301 p != NULL;
1302 p = mlock_dereference(p->next, br)) {
eb1d1641
HX		 1303 if (p->port != port)
1304 continue;
1305
1306 if (!hlist_unhashed(&p->mglist) &&
1307 (timer_pending(&p->timer) ?
1308 time_after(p->timer.expires, time) :
1309 try_to_del_timer_sync(&p->timer) >= 0)) {
1310 mod_timer(&p->timer, time);
1311
1312 p->queries_sent = 0;
1313 mod_timer(&p->query_timer, now);
1314 }
1315
1316 break;
1317 }
1318
1319out:
1320 spin_unlock(&br->multicast_lock);
1321}
1322
8ef2a9a5
YH		 1323static void br_ip4_multicast_leave_group(struct net_bridge *br,
1324 struct net_bridge_port *port,
1325 __be32 group)
1326{
1327 struct br_ip br_group;
1328
1329 if (ipv4_is_local_multicast(group))
1330 return;
1331
1332 br_group.u.ip4 = group;
1333 br_group.proto = htons(ETH_P_IP);
1334
1335 br_multicast_leave_group(br, port, &br_group);
1336}
1337
08b202b6
YH		 1338#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1339static void br_ip6_multicast_leave_group(struct net_bridge *br,
1340 struct net_bridge_port *port,
1341 const struct in6_addr *group)
1342{
1343 struct br_ip br_group;
1344
1345 if (ipv6_is_local_multicast(group))
1346 return;
1347
1348 ipv6_addr_copy(&br_group.u.ip6, group);
1349 br_group.proto = htons(ETH_P_IPV6);
1350
1351 br_multicast_leave_group(br, port, &br_group);
1352}
1353#endif
8ef2a9a5 1354
eb1d1641
HX		 1355static int br_multicast_ipv4_rcv(struct net_bridge *br,
1356 struct net_bridge_port *port,
1357 struct sk_buff *skb)
1358{
1359 struct sk_buff *skb2 = skb;
1360 struct iphdr *iph;
1361 struct igmphdr *ih;
1362 unsigned len;
1363 unsigned offset;
1364 int err;
1365
eb1d1641
HX		 1366 /* We treat OOM as packet loss for now. */
1367 if (!pskb_may_pull(skb, sizeof(*iph)))
1368 return -EINVAL;
1369
1370 iph = ip_hdr(skb);
1371
1372 if (iph->ihl < 5 || iph->version != 4)
1373 return -EINVAL;
1374
1375 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1376 return -EINVAL;
1377
1378 iph = ip_hdr(skb);
1379
1380 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1381 return -EINVAL;
1382
1383 if (iph->protocol != IPPROTO_IGMP)
1384 return 0;
1385
1386 len = ntohs(iph->tot_len);
1387 if (skb->len < len || len < ip_hdrlen(skb))
1388 return -EINVAL;
1389
1390 if (skb->len > len) {
1391 skb2 = skb_clone(skb, GFP_ATOMIC);
1392 if (!skb2)
1393 return -ENOMEM;
1394
1395 err = pskb_trim_rcsum(skb2, len);
1396 if (err)
8440853b 1397 goto err_out;
eb1d1641
HX		 1398 }
1399
1400 len -= ip_hdrlen(skb2);
1401 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1402 __skb_pull(skb2, offset);
1403 skb_reset_transport_header(skb2);
1404
1405 err = -EINVAL;
1406 if (!pskb_may_pull(skb2, sizeof(*ih)))
1407 goto out;
1408
eb1d1641
HX		 1409 switch (skb2->ip_summed) {
1410 case CHECKSUM_COMPLETE:
1411 if (!csum_fold(skb2->csum))
1412 break;
1413 /* fall through */
1414 case CHECKSUM_NONE:
1415 skb2->csum = 0;
1416 if (skb_checksum_complete(skb2))
8440853b 1417 goto out;
eb1d1641
HX		 1418 }
1419
1420 err = 0;
1421
1422 BR_INPUT_SKB_CB(skb)->igmp = 1;
1423 ih = igmp_hdr(skb2);
1424
1425 switch (ih->type) {
1426 case IGMP_HOST_MEMBERSHIP_REPORT:
1427 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1428 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
8ef2a9a5 1429 err = br_ip4_multicast_add_group(br, port, ih->group);
eb1d1641
HX		 1430 break;
1431 case IGMPV3_HOST_MEMBERSHIP_REPORT:
8ef2a9a5 1432 err = br_ip4_multicast_igmp3_report(br, port, skb2);
eb1d1641
HX		 1433 break;
1434 case IGMP_HOST_MEMBERSHIP_QUERY:
8ef2a9a5 1435 err = br_ip4_multicast_query(br, port, skb2);
eb1d1641
HX		 1436 break;
1437 case IGMP_HOST_LEAVE_MESSAGE:
8ef2a9a5 1438 br_ip4_multicast_leave_group(br, port, ih->group);
eb1d1641
HX		 1439 break;
1440 }
1441
1442out:
1443 __skb_push(skb2, offset);
8440853b 1444err_out:
eb1d1641
HX		 1445 if (skb2 != skb)
1446 kfree_skb(skb2);
1447 return err;
1448}
1449
08b202b6
YH		 1450#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1451static int br_multicast_ipv6_rcv(struct net_bridge *br,
1452 struct net_bridge_port *port,
1453 struct sk_buff *skb)
1454{
9d89081d 1455 struct sk_buff *skb2;
08b202b6
YH		 1456 struct ipv6hdr *ip6h;
1457 struct icmp6hdr *icmp6h;
1458 u8 nexthdr;
1459 unsigned len;
bb7a0bd6 1460 int offset;
08b202b6
YH		 1461 int err;
1462
08b202b6
YH		 1463 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1464 return -EINVAL;
1465
1466 ip6h = ipv6_hdr(skb);
1467
1468 /*
1469 * We're interested in MLD messages only.
1470 * - Version is 6
1471 * - MLD has always Router Alert hop-by-hop option
1472 * - But we do not support jumbrograms.
1473 */
1474 if (ip6h->version != 6 ||
1475 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1476 ip6h->payload_len == 0)
1477 return 0;
1478
1479 len = ntohs(ip6h->payload_len);
1480 if (skb->len < len)
1481 return -EINVAL;
1482
1483 nexthdr = ip6h->nexthdr;
1484 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
1485
1486 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1487 return 0;
1488
1489 /* Okay, we found ICMPv6 header */
1490 skb2 = skb_clone(skb, GFP_ATOMIC);
1491 if (!skb2)
1492 return -ENOMEM;
1493
9d89081d
TW		 1494 err = -EINVAL;
1495 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1496 goto out;
1497
08b202b6
YH		 1498 len -= offset - skb_network_offset(skb2);
1499
1500 __skb_pull(skb2, offset);
1501 skb_reset_transport_header(skb2);
1502
08b202b6
YH		 1503 icmp6h = icmp6_hdr(skb2);
1504
1505 switch (icmp6h->icmp6_type) {
1506 case ICMPV6_MGM_QUERY:
1507 case ICMPV6_MGM_REPORT:
1508 case ICMPV6_MGM_REDUCTION:
1509 case ICMPV6_MLD2_REPORT:
1510 break;
1511 default:
1512 err = 0;
1513 goto out;
1514 }
1515
1516 /* Okay, we found MLD message. Check further. */
1517 if (skb2->len > len) {
1518 err = pskb_trim_rcsum(skb2, len);
1519 if (err)
1520 goto out;
1521 }
1522
1523 switch (skb2->ip_summed) {
1524 case CHECKSUM_COMPLETE:
1525 if (!csum_fold(skb2->csum))
1526 break;
1527 /*FALLTHROUGH*/
1528 case CHECKSUM_NONE:
1529 skb2->csum = 0;
1530 if (skb_checksum_complete(skb2))
1531 goto out;
1532 }
1533
1534 err = 0;
1535
1536 BR_INPUT_SKB_CB(skb)->igmp = 1;
1537
1538 switch (icmp6h->icmp6_type) {
1539 case ICMPV6_MGM_REPORT:
1540 {
9d89081d
TW		 1541 struct mld_msg *mld;
1542 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1543 err = -EINVAL;
1544 goto out;
1545 }
1546 mld = (struct mld_msg *)skb_transport_header(skb2);
08b202b6
YH		 1547 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1548 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1549 break;
1550 }
1551 case ICMPV6_MLD2_REPORT:
1552 err = br_ip6_multicast_mld2_report(br, port, skb2);
1553 break;
1554 case ICMPV6_MGM_QUERY:
1555 err = br_ip6_multicast_query(br, port, skb2);
1556 break;
1557 case ICMPV6_MGM_REDUCTION:
1558 {
9d89081d
TW		 1559 struct mld_msg *mld;
1560 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1561 err = -EINVAL;
1562 goto out;
1563 }
1564 mld = (struct mld_msg *)skb_transport_header(skb2);
08b202b6
YH		 1565 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1566 }
1567 }
1568
1569out:
9d89081d 1570 kfree_skb(skb2);
08b202b6
YH		 1571 return err;
1572}
1573#endif
1574
eb1d1641
HX		 1575int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1576 struct sk_buff *skb)
1577{
1fafc7a9
YH		 1578 BR_INPUT_SKB_CB(skb)->igmp = 0;
1579 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1580
eb1d1641
HX		 1581 if (br->multicast_disabled)
1582 return 0;
1583
1584 switch (skb->protocol) {
1585 case htons(ETH_P_IP):
1586 return br_multicast_ipv4_rcv(br, port, skb);
08b202b6
YH		 1587#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1588 case htons(ETH_P_IPV6):
1589 return br_multicast_ipv6_rcv(br, port, skb);
1590#endif
eb1d1641
HX		 1591 }
1592
1593 return 0;
1594}
1595
1596static void br_multicast_query_expired(unsigned long data)
1597{
1598 struct net_bridge *br = (void *)data;
1599
1600 spin_lock(&br->multicast_lock);
1601 if (br->multicast_startup_queries_sent <
1602 br->multicast_startup_query_count)
1603 br->multicast_startup_queries_sent++;
1604
1605 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1606
1607 spin_unlock(&br->multicast_lock);
1608}
1609
1610void br_multicast_init(struct net_bridge *br)
1611{
1612 br->hash_elasticity = 4;
1613 br->hash_max = 512;
1614
1615 br->multicast_router = 1;
1616 br->multicast_last_member_count = 2;
1617 br->multicast_startup_query_count = 2;
1618
1619 br->multicast_last_member_interval = HZ;
1620 br->multicast_query_response_interval = 10 * HZ;
1621 br->multicast_startup_query_interval = 125 * HZ / 4;
1622 br->multicast_query_interval = 125 * HZ;
1623 br->multicast_querier_interval = 255 * HZ;
1624 br->multicast_membership_interval = 260 * HZ;
1625
1626 spin_lock_init(&br->multicast_lock);
1627 setup_timer(&br->multicast_router_timer,
1628 br_multicast_local_router_expired, 0);
1629 setup_timer(&br->multicast_querier_timer,
1630 br_multicast_local_router_expired, 0);
1631 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1632 (unsigned long)br);
1633}
1634
1635void br_multicast_open(struct net_bridge *br)
1636{
1637 br->multicast_startup_queries_sent = 0;
1638
1639 if (br->multicast_disabled)
1640 return;
1641
1642 mod_timer(&br->multicast_query_timer, jiffies);
1643}
1644
1645void br_multicast_stop(struct net_bridge *br)
1646{
1647 struct net_bridge_mdb_htable *mdb;
1648 struct net_bridge_mdb_entry *mp;
1649 struct hlist_node *p, *n;
1650 u32 ver;
1651 int i;
1652
1653 del_timer_sync(&br->multicast_router_timer);
1654 del_timer_sync(&br->multicast_querier_timer);
1655 del_timer_sync(&br->multicast_query_timer);
1656
1657 spin_lock_bh(&br->multicast_lock);
e8051688 1658 mdb = mlock_dereference(br->mdb, br);
eb1d1641
HX		 1659 if (!mdb)
1660 goto out;
1661
1662 br->mdb = NULL;
1663
1664 ver = mdb->ver;
1665 for (i = 0; i < mdb->max; i++) {
1666 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1667 hlist[ver]) {
1668 del_timer(&mp->timer);
1669 del_timer(&mp->query_timer);
1670 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1671 }
1672 }
1673
1674 if (mdb->old) {
1675 spin_unlock_bh(&br->multicast_lock);
10cc2b50 1676 rcu_barrier_bh();
eb1d1641
HX		 1677 spin_lock_bh(&br->multicast_lock);
1678 WARN_ON(mdb->old);
1679 }
1680
1681 mdb->old = mdb;
1682 call_rcu_bh(&mdb->rcu, br_mdb_free);
1683
1684out:
1685 spin_unlock_bh(&br->multicast_lock);
1686}
0909e117
HX		 1687
1688int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1689{
1690 int err = -ENOENT;
1691
1692 spin_lock_bh(&br->multicast_lock);
1693 if (!netif_running(br->dev))
1694 goto unlock;
1695
1696 switch (val) {
1697 case 0:
1698 case 2:
1699 del_timer(&br->multicast_router_timer);
1700 /* fall through */
1701 case 1:
1702 br->multicast_router = val;
1703 err = 0;
1704 break;
1705
1706 default:
1707 err = -EINVAL;
1708 break;
1709 }
1710
1711unlock:
1712 spin_unlock_bh(&br->multicast_lock);
1713
1714 return err;
1715}
1716
1717int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1718{
1719 struct net_bridge *br = p->br;
1720 int err = -ENOENT;
1721
1722 spin_lock(&br->multicast_lock);
1723 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1724 goto unlock;
1725
1726 switch (val) {
1727 case 0:
1728 case 1:
1729 case 2:
1730 p->multicast_router = val;
1731 err = 0;
1732
1733 if (val < 2 && !hlist_unhashed(&p->rlist))
1734 hlist_del_init_rcu(&p->rlist);
1735
1736 if (val == 1)
1737 break;
1738
1739 del_timer(&p->multicast_router_timer);
1740
1741 if (val == 0)
1742 break;
1743
1744 br_multicast_add_router(br, p);
1745 break;
1746
1747 default:
1748 err = -EINVAL;
1749 break;
1750 }
1751
1752unlock:
1753 spin_unlock(&br->multicast_lock);
1754
1755 return err;
1756}
561f1103
HX		 1757
1758int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1759{
1760 struct net_bridge_port *port;
3a7fda06 1761 int err = 0;
e8051688 1762 struct net_bridge_mdb_htable *mdb;
561f1103
HX		 1763
1764 spin_lock(&br->multicast_lock);
561f1103
HX		 1765 if (br->multicast_disabled == !val)
1766 goto unlock;
1767
1768 br->multicast_disabled = !val;
1769 if (br->multicast_disabled)
1770 goto unlock;
1771
3a7fda06
HX		 1772 if (!netif_running(br->dev))
1773 goto unlock;
1774
e8051688
ED		 1775 mdb = mlock_dereference(br->mdb, br);
1776 if (mdb) {
1777 if (mdb->old) {
561f1103
HX		 1778 err = -EEXIST;
1779rollback:
1780 br->multicast_disabled = !!val;
1781 goto unlock;
1782 }
1783
e8051688 1784 err = br_mdb_rehash(&br->mdb, mdb->max,
561f1103
HX		 1785 br->hash_elasticity);
1786 if (err)
1787 goto rollback;
1788 }
1789
1790 br_multicast_open(br);
1791 list_for_each_entry(port, &br->port_list, list) {
1792 if (port->state == BR_STATE_DISABLED ||
1793 port->state == BR_STATE_BLOCKING)
1794 continue;
1795
1796 __br_multicast_enable_port(port);
1797 }
1798
1799unlock:
1800 spin_unlock(&br->multicast_lock);
1801
1802 return err;
1803}
b195167f
HX		 1804
1805int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1806{
1807 int err = -ENOENT;
1808 u32 old;
e8051688 1809 struct net_bridge_mdb_htable *mdb;
b195167f
HX		 1810
1811 spin_lock(&br->multicast_lock);
1812 if (!netif_running(br->dev))
1813 goto unlock;
1814
1815 err = -EINVAL;
1816 if (!is_power_of_2(val))
1817 goto unlock;
e8051688
ED		 1818
1819 mdb = mlock_dereference(br->mdb, br);
1820 if (mdb && val < mdb->size)
b195167f
HX		 1821 goto unlock;
1822
1823 err = 0;
1824
1825 old = br->hash_max;
1826 br->hash_max = val;
1827
e8051688
ED		 1828 if (mdb) {
1829 if (mdb->old) {
b195167f
HX		 1830 err = -EEXIST;
1831rollback:
1832 br->hash_max = old;
1833 goto unlock;
1834 }
1835
1836 err = br_mdb_rehash(&br->mdb, br->hash_max,
1837 br->hash_elasticity);
1838 if (err)
1839 goto rollback;
1840 }
1841
1842unlock:
1843 spin_unlock(&br->multicast_lock);
1844
1845 return err;
1846}
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git