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Merge branch 'for-3.9-cleanups' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / net / bridge / br_multicast.c
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>
18 #include <linux/log2.h>
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>
27 #if IS_ENABLED(CONFIG_IPV6)
28 #include <net/ipv6.h>
29 #include <net/mld.h>
30 #include <net/ip6_checksum.h>
31 #endif
32
33 #include "br_private.h"
34
35 static void br_multicast_start_querier(struct net_bridge *br);
36 unsigned int br_mdb_rehash_seq;
37
38 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
39 {
40 if (a->proto != b->proto)
41 return 0;
42 switch (a->proto) {
43 case htons(ETH_P_IP):
44 return a->u.ip4 == b->u.ip4;
45 #if IS_ENABLED(CONFIG_IPV6)
46 case htons(ETH_P_IPV6):
47 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
48 #endif
49 }
50 return 0;
51 }
52
53 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
54 {
55 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
56 }
57
58 #if IS_ENABLED(CONFIG_IPV6)
59 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
60 const struct in6_addr *ip)
61 {
62 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
63 }
64 #endif
65
66 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
67 struct br_ip *ip)
68 {
69 switch (ip->proto) {
70 case htons(ETH_P_IP):
71 return __br_ip4_hash(mdb, ip->u.ip4);
72 #if IS_ENABLED(CONFIG_IPV6)
73 case htons(ETH_P_IPV6):
74 return __br_ip6_hash(mdb, &ip->u.ip6);
75 #endif
76 }
77 return 0;
78 }
79
80 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
81 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
82 {
83 struct net_bridge_mdb_entry *mp;
84 struct hlist_node *p;
85
86 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
87 if (br_ip_equal(&mp->addr, dst))
88 return mp;
89 }
90
91 return NULL;
92 }
93
94 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
95 struct br_ip *dst)
96 {
97 if (!mdb)
98 return NULL;
99
100 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
101 }
102
103 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
104 struct net_bridge_mdb_htable *mdb, __be32 dst)
105 {
106 struct br_ip br_dst;
107
108 br_dst.u.ip4 = dst;
109 br_dst.proto = htons(ETH_P_IP);
110
111 return br_mdb_ip_get(mdb, &br_dst);
112 }
113
114 #if IS_ENABLED(CONFIG_IPV6)
115 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
116 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
117 {
118 struct br_ip br_dst;
119
120 br_dst.u.ip6 = *dst;
121 br_dst.proto = htons(ETH_P_IPV6);
122
123 return br_mdb_ip_get(mdb, &br_dst);
124 }
125 #endif
126
127 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
128 struct sk_buff *skb)
129 {
130 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
131 struct br_ip ip;
132
133 if (br->multicast_disabled)
134 return NULL;
135
136 if (BR_INPUT_SKB_CB(skb)->igmp)
137 return NULL;
138
139 ip.proto = skb->protocol;
140
141 switch (skb->protocol) {
142 case htons(ETH_P_IP):
143 ip.u.ip4 = ip_hdr(skb)->daddr;
144 break;
145 #if IS_ENABLED(CONFIG_IPV6)
146 case htons(ETH_P_IPV6):
147 ip.u.ip6 = ipv6_hdr(skb)->daddr;
148 break;
149 #endif
150 default:
151 return NULL;
152 }
153
154 return br_mdb_ip_get(mdb, &ip);
155 }
156
157 static void br_mdb_free(struct rcu_head *head)
158 {
159 struct net_bridge_mdb_htable *mdb =
160 container_of(head, struct net_bridge_mdb_htable, rcu);
161 struct net_bridge_mdb_htable *old = mdb->old;
162
163 mdb->old = NULL;
164 kfree(old->mhash);
165 kfree(old);
166 }
167
168 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
169 struct net_bridge_mdb_htable *old,
170 int elasticity)
171 {
172 struct net_bridge_mdb_entry *mp;
173 struct hlist_node *p;
174 int maxlen;
175 int len;
176 int i;
177
178 for (i = 0; i < old->max; i++)
179 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
180 hlist_add_head(&mp->hlist[new->ver],
181 &new->mhash[br_ip_hash(new, &mp->addr)]);
182
183 if (!elasticity)
184 return 0;
185
186 maxlen = 0;
187 for (i = 0; i < new->max; i++) {
188 len = 0;
189 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
190 len++;
191 if (len > maxlen)
192 maxlen = len;
193 }
194
195 return maxlen > elasticity ? -EINVAL : 0;
196 }
197
198 void br_multicast_free_pg(struct rcu_head *head)
199 {
200 struct net_bridge_port_group *p =
201 container_of(head, struct net_bridge_port_group, rcu);
202
203 kfree(p);
204 }
205
206 static void br_multicast_free_group(struct rcu_head *head)
207 {
208 struct net_bridge_mdb_entry *mp =
209 container_of(head, struct net_bridge_mdb_entry, rcu);
210
211 kfree(mp);
212 }
213
214 static void br_multicast_group_expired(unsigned long data)
215 {
216 struct net_bridge_mdb_entry *mp = (void *)data;
217 struct net_bridge *br = mp->br;
218 struct net_bridge_mdb_htable *mdb;
219
220 spin_lock(&br->multicast_lock);
221 if (!netif_running(br->dev) || timer_pending(&mp->timer))
222 goto out;
223
224 mp->mglist = false;
225
226 if (mp->ports)
227 goto out;
228
229 mdb = mlock_dereference(br->mdb, br);
230
231 hlist_del_rcu(&mp->hlist[mdb->ver]);
232 mdb->size--;
233
234 call_rcu_bh(&mp->rcu, br_multicast_free_group);
235
236 out:
237 spin_unlock(&br->multicast_lock);
238 }
239
240 static void br_multicast_del_pg(struct net_bridge *br,
241 struct net_bridge_port_group *pg)
242 {
243 struct net_bridge_mdb_htable *mdb;
244 struct net_bridge_mdb_entry *mp;
245 struct net_bridge_port_group *p;
246 struct net_bridge_port_group __rcu **pp;
247
248 mdb = mlock_dereference(br->mdb, br);
249
250 mp = br_mdb_ip_get(mdb, &pg->addr);
251 if (WARN_ON(!mp))
252 return;
253
254 for (pp = &mp->ports;
255 (p = mlock_dereference(*pp, br)) != NULL;
256 pp = &p->next) {
257 if (p != pg)
258 continue;
259
260 rcu_assign_pointer(*pp, p->next);
261 hlist_del_init(&p->mglist);
262 del_timer(&p->timer);
263 call_rcu_bh(&p->rcu, br_multicast_free_pg);
264
265 if (!mp->ports && !mp->mglist &&
266 netif_running(br->dev))
267 mod_timer(&mp->timer, jiffies);
268
269 return;
270 }
271
272 WARN_ON(1);
273 }
274
275 static void br_multicast_port_group_expired(unsigned long data)
276 {
277 struct net_bridge_port_group *pg = (void *)data;
278 struct net_bridge *br = pg->port->br;
279
280 spin_lock(&br->multicast_lock);
281 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
282 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
283 goto out;
284
285 br_multicast_del_pg(br, pg);
286
287 out:
288 spin_unlock(&br->multicast_lock);
289 }
290
291 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
292 int elasticity)
293 {
294 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
295 struct net_bridge_mdb_htable *mdb;
296 int err;
297
298 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
299 if (!mdb)
300 return -ENOMEM;
301
302 mdb->max = max;
303 mdb->old = old;
304
305 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
306 if (!mdb->mhash) {
307 kfree(mdb);
308 return -ENOMEM;
309 }
310
311 mdb->size = old ? old->size : 0;
312 mdb->ver = old ? old->ver ^ 1 : 0;
313
314 if (!old || elasticity)
315 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
316 else
317 mdb->secret = old->secret;
318
319 if (!old)
320 goto out;
321
322 err = br_mdb_copy(mdb, old, elasticity);
323 if (err) {
324 kfree(mdb->mhash);
325 kfree(mdb);
326 return err;
327 }
328
329 br_mdb_rehash_seq++;
330 call_rcu_bh(&mdb->rcu, br_mdb_free);
331
332 out:
333 rcu_assign_pointer(*mdbp, mdb);
334
335 return 0;
336 }
337
338 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
339 __be32 group)
340 {
341 struct sk_buff *skb;
342 struct igmphdr *ih;
343 struct ethhdr *eth;
344 struct iphdr *iph;
345
346 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
347 sizeof(*ih) + 4);
348 if (!skb)
349 goto out;
350
351 skb->protocol = htons(ETH_P_IP);
352
353 skb_reset_mac_header(skb);
354 eth = eth_hdr(skb);
355
356 memcpy(eth->h_source, br->dev->dev_addr, 6);
357 eth->h_dest[0] = 1;
358 eth->h_dest[1] = 0;
359 eth->h_dest[2] = 0x5e;
360 eth->h_dest[3] = 0;
361 eth->h_dest[4] = 0;
362 eth->h_dest[5] = 1;
363 eth->h_proto = htons(ETH_P_IP);
364 skb_put(skb, sizeof(*eth));
365
366 skb_set_network_header(skb, skb->len);
367 iph = ip_hdr(skb);
368
369 iph->version = 4;
370 iph->ihl = 6;
371 iph->tos = 0xc0;
372 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
373 iph->id = 0;
374 iph->frag_off = htons(IP_DF);
375 iph->ttl = 1;
376 iph->protocol = IPPROTO_IGMP;
377 iph->saddr = 0;
378 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
379 ((u8 *)&iph[1])[0] = IPOPT_RA;
380 ((u8 *)&iph[1])[1] = 4;
381 ((u8 *)&iph[1])[2] = 0;
382 ((u8 *)&iph[1])[3] = 0;
383 ip_send_check(iph);
384 skb_put(skb, 24);
385
386 skb_set_transport_header(skb, skb->len);
387 ih = igmp_hdr(skb);
388 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
389 ih->code = (group ? br->multicast_last_member_interval :
390 br->multicast_query_response_interval) /
391 (HZ / IGMP_TIMER_SCALE);
392 ih->group = group;
393 ih->csum = 0;
394 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
395 skb_put(skb, sizeof(*ih));
396
397 __skb_pull(skb, sizeof(*eth));
398
399 out:
400 return skb;
401 }
402
403 #if IS_ENABLED(CONFIG_IPV6)
404 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
405 const struct in6_addr *group)
406 {
407 struct sk_buff *skb;
408 struct ipv6hdr *ip6h;
409 struct mld_msg *mldq;
410 struct ethhdr *eth;
411 u8 *hopopt;
412 unsigned long interval;
413
414 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
415 8 + sizeof(*mldq));
416 if (!skb)
417 goto out;
418
419 skb->protocol = htons(ETH_P_IPV6);
420
421 /* Ethernet header */
422 skb_reset_mac_header(skb);
423 eth = eth_hdr(skb);
424
425 memcpy(eth->h_source, br->dev->dev_addr, 6);
426 eth->h_proto = htons(ETH_P_IPV6);
427 skb_put(skb, sizeof(*eth));
428
429 /* IPv6 header + HbH option */
430 skb_set_network_header(skb, skb->len);
431 ip6h = ipv6_hdr(skb);
432
433 *(__force __be32 *)ip6h = htonl(0x60000000);
434 ip6h->payload_len = htons(8 + sizeof(*mldq));
435 ip6h->nexthdr = IPPROTO_HOPOPTS;
436 ip6h->hop_limit = 1;
437 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
438 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
439 &ip6h->saddr)) {
440 kfree_skb(skb);
441 return NULL;
442 }
443 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
444
445 hopopt = (u8 *)(ip6h + 1);
446 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
447 hopopt[1] = 0; /* length of HbH */
448 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
449 hopopt[3] = 2; /* Length of RA Option */
450 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
451 hopopt[5] = 0;
452 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
453 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
454
455 skb_put(skb, sizeof(*ip6h) + 8);
456
457 /* ICMPv6 */
458 skb_set_transport_header(skb, skb->len);
459 mldq = (struct mld_msg *) icmp6_hdr(skb);
460
461 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
462 br->multicast_query_response_interval;
463
464 mldq->mld_type = ICMPV6_MGM_QUERY;
465 mldq->mld_code = 0;
466 mldq->mld_cksum = 0;
467 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
468 mldq->mld_reserved = 0;
469 mldq->mld_mca = *group;
470
471 /* checksum */
472 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
473 sizeof(*mldq), IPPROTO_ICMPV6,
474 csum_partial(mldq,
475 sizeof(*mldq), 0));
476 skb_put(skb, sizeof(*mldq));
477
478 __skb_pull(skb, sizeof(*eth));
479
480 out:
481 return skb;
482 }
483 #endif
484
485 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
486 struct br_ip *addr)
487 {
488 switch (addr->proto) {
489 case htons(ETH_P_IP):
490 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
491 #if IS_ENABLED(CONFIG_IPV6)
492 case htons(ETH_P_IPV6):
493 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
494 #endif
495 }
496 return NULL;
497 }
498
499 static struct net_bridge_mdb_entry *br_multicast_get_group(
500 struct net_bridge *br, struct net_bridge_port *port,
501 struct br_ip *group, int hash)
502 {
503 struct net_bridge_mdb_htable *mdb;
504 struct net_bridge_mdb_entry *mp;
505 struct hlist_node *p;
506 unsigned int count = 0;
507 unsigned int max;
508 int elasticity;
509 int err;
510
511 mdb = rcu_dereference_protected(br->mdb, 1);
512 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
513 count++;
514 if (unlikely(br_ip_equal(group, &mp->addr)))
515 return mp;
516 }
517
518 elasticity = 0;
519 max = mdb->max;
520
521 if (unlikely(count > br->hash_elasticity && count)) {
522 if (net_ratelimit())
523 br_info(br, "Multicast hash table "
524 "chain limit reached: %s\n",
525 port ? port->dev->name : br->dev->name);
526
527 elasticity = br->hash_elasticity;
528 }
529
530 if (mdb->size >= max) {
531 max *= 2;
532 if (unlikely(max > br->hash_max)) {
533 br_warn(br, "Multicast hash table maximum of %d "
534 "reached, disabling snooping: %s\n",
535 br->hash_max,
536 port ? port->dev->name : br->dev->name);
537 err = -E2BIG;
538 disable:
539 br->multicast_disabled = 1;
540 goto err;
541 }
542 }
543
544 if (max > mdb->max || elasticity) {
545 if (mdb->old) {
546 if (net_ratelimit())
547 br_info(br, "Multicast hash table "
548 "on fire: %s\n",
549 port ? port->dev->name : br->dev->name);
550 err = -EEXIST;
551 goto err;
552 }
553
554 err = br_mdb_rehash(&br->mdb, max, elasticity);
555 if (err) {
556 br_warn(br, "Cannot rehash multicast "
557 "hash table, disabling snooping: %s, %d, %d\n",
558 port ? port->dev->name : br->dev->name,
559 mdb->size, err);
560 goto disable;
561 }
562
563 err = -EAGAIN;
564 goto err;
565 }
566
567 return NULL;
568
569 err:
570 mp = ERR_PTR(err);
571 return mp;
572 }
573
574 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
575 struct net_bridge_port *port, struct br_ip *group)
576 {
577 struct net_bridge_mdb_htable *mdb;
578 struct net_bridge_mdb_entry *mp;
579 int hash;
580 int err;
581
582 mdb = rcu_dereference_protected(br->mdb, 1);
583 if (!mdb) {
584 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
585 if (err)
586 return ERR_PTR(err);
587 goto rehash;
588 }
589
590 hash = br_ip_hash(mdb, group);
591 mp = br_multicast_get_group(br, port, group, hash);
592 switch (PTR_ERR(mp)) {
593 case 0:
594 break;
595
596 case -EAGAIN:
597 rehash:
598 mdb = rcu_dereference_protected(br->mdb, 1);
599 hash = br_ip_hash(mdb, group);
600 break;
601
602 default:
603 goto out;
604 }
605
606 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
607 if (unlikely(!mp))
608 return ERR_PTR(-ENOMEM);
609
610 mp->br = br;
611 mp->addr = *group;
612 setup_timer(&mp->timer, br_multicast_group_expired,
613 (unsigned long)mp);
614
615 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
616 mdb->size++;
617
618 out:
619 return mp;
620 }
621
622 struct net_bridge_port_group *br_multicast_new_port_group(
623 struct net_bridge_port *port,
624 struct br_ip *group,
625 struct net_bridge_port_group __rcu *next,
626 unsigned char state)
627 {
628 struct net_bridge_port_group *p;
629
630 p = kzalloc(sizeof(*p), GFP_ATOMIC);
631 if (unlikely(!p))
632 return NULL;
633
634 p->addr = *group;
635 p->port = port;
636 p->state = state;
637 rcu_assign_pointer(p->next, next);
638 hlist_add_head(&p->mglist, &port->mglist);
639 setup_timer(&p->timer, br_multicast_port_group_expired,
640 (unsigned long)p);
641 return p;
642 }
643
644 static int br_multicast_add_group(struct net_bridge *br,
645 struct net_bridge_port *port,
646 struct br_ip *group)
647 {
648 struct net_bridge_mdb_entry *mp;
649 struct net_bridge_port_group *p;
650 struct net_bridge_port_group __rcu **pp;
651 unsigned long now = jiffies;
652 int err;
653
654 spin_lock(&br->multicast_lock);
655 if (!netif_running(br->dev) ||
656 (port && port->state == BR_STATE_DISABLED))
657 goto out;
658
659 mp = br_multicast_new_group(br, port, group);
660 err = PTR_ERR(mp);
661 if (IS_ERR(mp))
662 goto err;
663
664 if (!port) {
665 mp->mglist = true;
666 mod_timer(&mp->timer, now + br->multicast_membership_interval);
667 goto out;
668 }
669
670 for (pp = &mp->ports;
671 (p = mlock_dereference(*pp, br)) != NULL;
672 pp = &p->next) {
673 if (p->port == port)
674 goto found;
675 if ((unsigned long)p->port < (unsigned long)port)
676 break;
677 }
678
679 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
680 if (unlikely(!p))
681 goto err;
682 rcu_assign_pointer(*pp, p);
683 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
684
685 found:
686 mod_timer(&p->timer, now + br->multicast_membership_interval);
687 out:
688 err = 0;
689
690 err:
691 spin_unlock(&br->multicast_lock);
692 return err;
693 }
694
695 static int br_ip4_multicast_add_group(struct net_bridge *br,
696 struct net_bridge_port *port,
697 __be32 group)
698 {
699 struct br_ip br_group;
700
701 if (ipv4_is_local_multicast(group))
702 return 0;
703
704 br_group.u.ip4 = group;
705 br_group.proto = htons(ETH_P_IP);
706
707 return br_multicast_add_group(br, port, &br_group);
708 }
709
710 #if IS_ENABLED(CONFIG_IPV6)
711 static int br_ip6_multicast_add_group(struct net_bridge *br,
712 struct net_bridge_port *port,
713 const struct in6_addr *group)
714 {
715 struct br_ip br_group;
716
717 if (!ipv6_is_transient_multicast(group))
718 return 0;
719
720 br_group.u.ip6 = *group;
721 br_group.proto = htons(ETH_P_IPV6);
722
723 return br_multicast_add_group(br, port, &br_group);
724 }
725 #endif
726
727 static void br_multicast_router_expired(unsigned long data)
728 {
729 struct net_bridge_port *port = (void *)data;
730 struct net_bridge *br = port->br;
731
732 spin_lock(&br->multicast_lock);
733 if (port->multicast_router != 1 ||
734 timer_pending(&port->multicast_router_timer) ||
735 hlist_unhashed(&port->rlist))
736 goto out;
737
738 hlist_del_init_rcu(&port->rlist);
739
740 out:
741 spin_unlock(&br->multicast_lock);
742 }
743
744 static void br_multicast_local_router_expired(unsigned long data)
745 {
746 }
747
748 static void br_multicast_querier_expired(unsigned long data)
749 {
750 struct net_bridge *br = (void *)data;
751
752 spin_lock(&br->multicast_lock);
753 if (!netif_running(br->dev) || br->multicast_disabled)
754 goto out;
755
756 br_multicast_start_querier(br);
757
758 out:
759 spin_unlock(&br->multicast_lock);
760 }
761
762 static void __br_multicast_send_query(struct net_bridge *br,
763 struct net_bridge_port *port,
764 struct br_ip *ip)
765 {
766 struct sk_buff *skb;
767
768 skb = br_multicast_alloc_query(br, ip);
769 if (!skb)
770 return;
771
772 if (port) {
773 __skb_push(skb, sizeof(struct ethhdr));
774 skb->dev = port->dev;
775 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
776 dev_queue_xmit);
777 } else
778 netif_rx(skb);
779 }
780
781 static void br_multicast_send_query(struct net_bridge *br,
782 struct net_bridge_port *port, u32 sent)
783 {
784 unsigned long time;
785 struct br_ip br_group;
786
787 if (!netif_running(br->dev) || br->multicast_disabled ||
788 !br->multicast_querier ||
789 timer_pending(&br->multicast_querier_timer))
790 return;
791
792 memset(&br_group.u, 0, sizeof(br_group.u));
793
794 br_group.proto = htons(ETH_P_IP);
795 __br_multicast_send_query(br, port, &br_group);
796
797 #if IS_ENABLED(CONFIG_IPV6)
798 br_group.proto = htons(ETH_P_IPV6);
799 __br_multicast_send_query(br, port, &br_group);
800 #endif
801
802 time = jiffies;
803 time += sent < br->multicast_startup_query_count ?
804 br->multicast_startup_query_interval :
805 br->multicast_query_interval;
806 mod_timer(port ? &port->multicast_query_timer :
807 &br->multicast_query_timer, time);
808 }
809
810 static void br_multicast_port_query_expired(unsigned long data)
811 {
812 struct net_bridge_port *port = (void *)data;
813 struct net_bridge *br = port->br;
814
815 spin_lock(&br->multicast_lock);
816 if (port->state == BR_STATE_DISABLED ||
817 port->state == BR_STATE_BLOCKING)
818 goto out;
819
820 if (port->multicast_startup_queries_sent <
821 br->multicast_startup_query_count)
822 port->multicast_startup_queries_sent++;
823
824 br_multicast_send_query(port->br, port,
825 port->multicast_startup_queries_sent);
826
827 out:
828 spin_unlock(&br->multicast_lock);
829 }
830
831 void br_multicast_add_port(struct net_bridge_port *port)
832 {
833 port->multicast_router = 1;
834
835 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
836 (unsigned long)port);
837 setup_timer(&port->multicast_query_timer,
838 br_multicast_port_query_expired, (unsigned long)port);
839 }
840
841 void br_multicast_del_port(struct net_bridge_port *port)
842 {
843 del_timer_sync(&port->multicast_router_timer);
844 }
845
846 static void __br_multicast_enable_port(struct net_bridge_port *port)
847 {
848 port->multicast_startup_queries_sent = 0;
849
850 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
851 del_timer(&port->multicast_query_timer))
852 mod_timer(&port->multicast_query_timer, jiffies);
853 }
854
855 void br_multicast_enable_port(struct net_bridge_port *port)
856 {
857 struct net_bridge *br = port->br;
858
859 spin_lock(&br->multicast_lock);
860 if (br->multicast_disabled || !netif_running(br->dev))
861 goto out;
862
863 __br_multicast_enable_port(port);
864
865 out:
866 spin_unlock(&br->multicast_lock);
867 }
868
869 void br_multicast_disable_port(struct net_bridge_port *port)
870 {
871 struct net_bridge *br = port->br;
872 struct net_bridge_port_group *pg;
873 struct hlist_node *p, *n;
874
875 spin_lock(&br->multicast_lock);
876 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
877 br_multicast_del_pg(br, pg);
878
879 if (!hlist_unhashed(&port->rlist))
880 hlist_del_init_rcu(&port->rlist);
881 del_timer(&port->multicast_router_timer);
882 del_timer(&port->multicast_query_timer);
883 spin_unlock(&br->multicast_lock);
884 }
885
886 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
887 struct net_bridge_port *port,
888 struct sk_buff *skb)
889 {
890 struct igmpv3_report *ih;
891 struct igmpv3_grec *grec;
892 int i;
893 int len;
894 int num;
895 int type;
896 int err = 0;
897 __be32 group;
898
899 if (!pskb_may_pull(skb, sizeof(*ih)))
900 return -EINVAL;
901
902 ih = igmpv3_report_hdr(skb);
903 num = ntohs(ih->ngrec);
904 len = sizeof(*ih);
905
906 for (i = 0; i < num; i++) {
907 len += sizeof(*grec);
908 if (!pskb_may_pull(skb, len))
909 return -EINVAL;
910
911 grec = (void *)(skb->data + len - sizeof(*grec));
912 group = grec->grec_mca;
913 type = grec->grec_type;
914
915 len += ntohs(grec->grec_nsrcs) * 4;
916 if (!pskb_may_pull(skb, len))
917 return -EINVAL;
918
919 /* We treat this as an IGMPv2 report for now. */
920 switch (type) {
921 case IGMPV3_MODE_IS_INCLUDE:
922 case IGMPV3_MODE_IS_EXCLUDE:
923 case IGMPV3_CHANGE_TO_INCLUDE:
924 case IGMPV3_CHANGE_TO_EXCLUDE:
925 case IGMPV3_ALLOW_NEW_SOURCES:
926 case IGMPV3_BLOCK_OLD_SOURCES:
927 break;
928
929 default:
930 continue;
931 }
932
933 err = br_ip4_multicast_add_group(br, port, group);
934 if (err)
935 break;
936 }
937
938 return err;
939 }
940
941 #if IS_ENABLED(CONFIG_IPV6)
942 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
943 struct net_bridge_port *port,
944 struct sk_buff *skb)
945 {
946 struct icmp6hdr *icmp6h;
947 struct mld2_grec *grec;
948 int i;
949 int len;
950 int num;
951 int err = 0;
952
953 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
954 return -EINVAL;
955
956 icmp6h = icmp6_hdr(skb);
957 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
958 len = sizeof(*icmp6h);
959
960 for (i = 0; i < num; i++) {
961 __be16 *nsrcs, _nsrcs;
962
963 nsrcs = skb_header_pointer(skb,
964 len + offsetof(struct mld2_grec,
965 grec_nsrcs),
966 sizeof(_nsrcs), &_nsrcs);
967 if (!nsrcs)
968 return -EINVAL;
969
970 if (!pskb_may_pull(skb,
971 len + sizeof(*grec) +
972 sizeof(struct in6_addr) * ntohs(*nsrcs)))
973 return -EINVAL;
974
975 grec = (struct mld2_grec *)(skb->data + len);
976 len += sizeof(*grec) +
977 sizeof(struct in6_addr) * ntohs(*nsrcs);
978
979 /* We treat these as MLDv1 reports for now. */
980 switch (grec->grec_type) {
981 case MLD2_MODE_IS_INCLUDE:
982 case MLD2_MODE_IS_EXCLUDE:
983 case MLD2_CHANGE_TO_INCLUDE:
984 case MLD2_CHANGE_TO_EXCLUDE:
985 case MLD2_ALLOW_NEW_SOURCES:
986 case MLD2_BLOCK_OLD_SOURCES:
987 break;
988
989 default:
990 continue;
991 }
992
993 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
994 if (!err)
995 break;
996 }
997
998 return err;
999 }
1000 #endif
1001
1002 /*
1003 * Add port to rotuer_list
1004 * list is maintained ordered by pointer value
1005 * and locked by br->multicast_lock and RCU
1006 */
1007 static void br_multicast_add_router(struct net_bridge *br,
1008 struct net_bridge_port *port)
1009 {
1010 struct net_bridge_port *p;
1011 struct hlist_node *n, *slot = NULL;
1012
1013 hlist_for_each_entry(p, n, &br->router_list, rlist) {
1014 if ((unsigned long) port >= (unsigned long) p)
1015 break;
1016 slot = n;
1017 }
1018
1019 if (slot)
1020 hlist_add_after_rcu(slot, &port->rlist);
1021 else
1022 hlist_add_head_rcu(&port->rlist, &br->router_list);
1023 }
1024
1025 static void br_multicast_mark_router(struct net_bridge *br,
1026 struct net_bridge_port *port)
1027 {
1028 unsigned long now = jiffies;
1029
1030 if (!port) {
1031 if (br->multicast_router == 1)
1032 mod_timer(&br->multicast_router_timer,
1033 now + br->multicast_querier_interval);
1034 return;
1035 }
1036
1037 if (port->multicast_router != 1)
1038 return;
1039
1040 if (!hlist_unhashed(&port->rlist))
1041 goto timer;
1042
1043 br_multicast_add_router(br, port);
1044
1045 timer:
1046 mod_timer(&port->multicast_router_timer,
1047 now + br->multicast_querier_interval);
1048 }
1049
1050 static void br_multicast_query_received(struct net_bridge *br,
1051 struct net_bridge_port *port,
1052 int saddr)
1053 {
1054 if (saddr)
1055 mod_timer(&br->multicast_querier_timer,
1056 jiffies + br->multicast_querier_interval);
1057 else if (timer_pending(&br->multicast_querier_timer))
1058 return;
1059
1060 br_multicast_mark_router(br, port);
1061 }
1062
1063 static int br_ip4_multicast_query(struct net_bridge *br,
1064 struct net_bridge_port *port,
1065 struct sk_buff *skb)
1066 {
1067 const struct iphdr *iph = ip_hdr(skb);
1068 struct igmphdr *ih = igmp_hdr(skb);
1069 struct net_bridge_mdb_entry *mp;
1070 struct igmpv3_query *ih3;
1071 struct net_bridge_port_group *p;
1072 struct net_bridge_port_group __rcu **pp;
1073 unsigned long max_delay;
1074 unsigned long now = jiffies;
1075 __be32 group;
1076 int err = 0;
1077
1078 spin_lock(&br->multicast_lock);
1079 if (!netif_running(br->dev) ||
1080 (port && port->state == BR_STATE_DISABLED))
1081 goto out;
1082
1083 br_multicast_query_received(br, port, !!iph->saddr);
1084
1085 group = ih->group;
1086
1087 if (skb->len == sizeof(*ih)) {
1088 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1089
1090 if (!max_delay) {
1091 max_delay = 10 * HZ;
1092 group = 0;
1093 }
1094 } else {
1095 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1096 err = -EINVAL;
1097 goto out;
1098 }
1099
1100 ih3 = igmpv3_query_hdr(skb);
1101 if (ih3->nsrcs)
1102 goto out;
1103
1104 max_delay = ih3->code ?
1105 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1106 }
1107
1108 if (!group)
1109 goto out;
1110
1111 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
1112 if (!mp)
1113 goto out;
1114
1115 max_delay *= br->multicast_last_member_count;
1116
1117 if (mp->mglist &&
1118 (timer_pending(&mp->timer) ?
1119 time_after(mp->timer.expires, now + max_delay) :
1120 try_to_del_timer_sync(&mp->timer) >= 0))
1121 mod_timer(&mp->timer, now + max_delay);
1122
1123 for (pp = &mp->ports;
1124 (p = mlock_dereference(*pp, br)) != NULL;
1125 pp = &p->next) {
1126 if (timer_pending(&p->timer) ?
1127 time_after(p->timer.expires, now + max_delay) :
1128 try_to_del_timer_sync(&p->timer) >= 0)
1129 mod_timer(&p->timer, now + max_delay);
1130 }
1131
1132 out:
1133 spin_unlock(&br->multicast_lock);
1134 return err;
1135 }
1136
1137 #if IS_ENABLED(CONFIG_IPV6)
1138 static int br_ip6_multicast_query(struct net_bridge *br,
1139 struct net_bridge_port *port,
1140 struct sk_buff *skb)
1141 {
1142 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1143 struct mld_msg *mld;
1144 struct net_bridge_mdb_entry *mp;
1145 struct mld2_query *mld2q;
1146 struct net_bridge_port_group *p;
1147 struct net_bridge_port_group __rcu **pp;
1148 unsigned long max_delay;
1149 unsigned long now = jiffies;
1150 const struct in6_addr *group = NULL;
1151 int err = 0;
1152
1153 spin_lock(&br->multicast_lock);
1154 if (!netif_running(br->dev) ||
1155 (port && port->state == BR_STATE_DISABLED))
1156 goto out;
1157
1158 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1159
1160 if (skb->len == sizeof(*mld)) {
1161 if (!pskb_may_pull(skb, sizeof(*mld))) {
1162 err = -EINVAL;
1163 goto out;
1164 }
1165 mld = (struct mld_msg *) icmp6_hdr(skb);
1166 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1167 if (max_delay)
1168 group = &mld->mld_mca;
1169 } else if (skb->len >= sizeof(*mld2q)) {
1170 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1171 err = -EINVAL;
1172 goto out;
1173 }
1174 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1175 if (!mld2q->mld2q_nsrcs)
1176 group = &mld2q->mld2q_mca;
1177 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(ntohs(mld2q->mld2q_mrc)) : 1;
1178 }
1179
1180 if (!group)
1181 goto out;
1182
1183 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
1184 if (!mp)
1185 goto out;
1186
1187 max_delay *= br->multicast_last_member_count;
1188 if (mp->mglist &&
1189 (timer_pending(&mp->timer) ?
1190 time_after(mp->timer.expires, now + max_delay) :
1191 try_to_del_timer_sync(&mp->timer) >= 0))
1192 mod_timer(&mp->timer, now + max_delay);
1193
1194 for (pp = &mp->ports;
1195 (p = mlock_dereference(*pp, br)) != NULL;
1196 pp = &p->next) {
1197 if (timer_pending(&p->timer) ?
1198 time_after(p->timer.expires, now + max_delay) :
1199 try_to_del_timer_sync(&p->timer) >= 0)
1200 mod_timer(&p->timer, now + max_delay);
1201 }
1202
1203 out:
1204 spin_unlock(&br->multicast_lock);
1205 return err;
1206 }
1207 #endif
1208
1209 static void br_multicast_leave_group(struct net_bridge *br,
1210 struct net_bridge_port *port,
1211 struct br_ip *group)
1212 {
1213 struct net_bridge_mdb_htable *mdb;
1214 struct net_bridge_mdb_entry *mp;
1215 struct net_bridge_port_group *p;
1216 unsigned long now;
1217 unsigned long time;
1218
1219 spin_lock(&br->multicast_lock);
1220 if (!netif_running(br->dev) ||
1221 (port && port->state == BR_STATE_DISABLED) ||
1222 timer_pending(&br->multicast_querier_timer))
1223 goto out;
1224
1225 mdb = mlock_dereference(br->mdb, br);
1226 mp = br_mdb_ip_get(mdb, group);
1227 if (!mp)
1228 goto out;
1229
1230 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1231 struct net_bridge_port_group __rcu **pp;
1232
1233 for (pp = &mp->ports;
1234 (p = mlock_dereference(*pp, br)) != NULL;
1235 pp = &p->next) {
1236 if (p->port != port)
1237 continue;
1238
1239 rcu_assign_pointer(*pp, p->next);
1240 hlist_del_init(&p->mglist);
1241 del_timer(&p->timer);
1242 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1243 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1244
1245 if (!mp->ports && !mp->mglist &&
1246 netif_running(br->dev))
1247 mod_timer(&mp->timer, jiffies);
1248 }
1249 goto out;
1250 }
1251
1252 now = jiffies;
1253 time = now + br->multicast_last_member_count *
1254 br->multicast_last_member_interval;
1255
1256 if (!port) {
1257 if (mp->mglist &&
1258 (timer_pending(&mp->timer) ?
1259 time_after(mp->timer.expires, time) :
1260 try_to_del_timer_sync(&mp->timer) >= 0)) {
1261 mod_timer(&mp->timer, time);
1262 }
1263
1264 goto out;
1265 }
1266
1267 for (p = mlock_dereference(mp->ports, br);
1268 p != NULL;
1269 p = mlock_dereference(p->next, br)) {
1270 if (p->port != port)
1271 continue;
1272
1273 if (!hlist_unhashed(&p->mglist) &&
1274 (timer_pending(&p->timer) ?
1275 time_after(p->timer.expires, time) :
1276 try_to_del_timer_sync(&p->timer) >= 0)) {
1277 mod_timer(&p->timer, time);
1278 }
1279
1280 break;
1281 }
1282
1283 out:
1284 spin_unlock(&br->multicast_lock);
1285 }
1286
1287 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1288 struct net_bridge_port *port,
1289 __be32 group)
1290 {
1291 struct br_ip br_group;
1292
1293 if (ipv4_is_local_multicast(group))
1294 return;
1295
1296 br_group.u.ip4 = group;
1297 br_group.proto = htons(ETH_P_IP);
1298
1299 br_multicast_leave_group(br, port, &br_group);
1300 }
1301
1302 #if IS_ENABLED(CONFIG_IPV6)
1303 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1304 struct net_bridge_port *port,
1305 const struct in6_addr *group)
1306 {
1307 struct br_ip br_group;
1308
1309 if (!ipv6_is_transient_multicast(group))
1310 return;
1311
1312 br_group.u.ip6 = *group;
1313 br_group.proto = htons(ETH_P_IPV6);
1314
1315 br_multicast_leave_group(br, port, &br_group);
1316 }
1317 #endif
1318
1319 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1320 struct net_bridge_port *port,
1321 struct sk_buff *skb)
1322 {
1323 struct sk_buff *skb2 = skb;
1324 const struct iphdr *iph;
1325 struct igmphdr *ih;
1326 unsigned int len;
1327 unsigned int offset;
1328 int err;
1329
1330 /* We treat OOM as packet loss for now. */
1331 if (!pskb_may_pull(skb, sizeof(*iph)))
1332 return -EINVAL;
1333
1334 iph = ip_hdr(skb);
1335
1336 if (iph->ihl < 5 || iph->version != 4)
1337 return -EINVAL;
1338
1339 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1340 return -EINVAL;
1341
1342 iph = ip_hdr(skb);
1343
1344 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1345 return -EINVAL;
1346
1347 if (iph->protocol != IPPROTO_IGMP) {
1348 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
1349 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1350 return 0;
1351 }
1352
1353 len = ntohs(iph->tot_len);
1354 if (skb->len < len || len < ip_hdrlen(skb))
1355 return -EINVAL;
1356
1357 if (skb->len > len) {
1358 skb2 = skb_clone(skb, GFP_ATOMIC);
1359 if (!skb2)
1360 return -ENOMEM;
1361
1362 err = pskb_trim_rcsum(skb2, len);
1363 if (err)
1364 goto err_out;
1365 }
1366
1367 len -= ip_hdrlen(skb2);
1368 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1369 __skb_pull(skb2, offset);
1370 skb_reset_transport_header(skb2);
1371
1372 err = -EINVAL;
1373 if (!pskb_may_pull(skb2, sizeof(*ih)))
1374 goto out;
1375
1376 switch (skb2->ip_summed) {
1377 case CHECKSUM_COMPLETE:
1378 if (!csum_fold(skb2->csum))
1379 break;
1380 /* fall through */
1381 case CHECKSUM_NONE:
1382 skb2->csum = 0;
1383 if (skb_checksum_complete(skb2))
1384 goto out;
1385 }
1386
1387 err = 0;
1388
1389 BR_INPUT_SKB_CB(skb)->igmp = 1;
1390 ih = igmp_hdr(skb2);
1391
1392 switch (ih->type) {
1393 case IGMP_HOST_MEMBERSHIP_REPORT:
1394 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1395 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1396 err = br_ip4_multicast_add_group(br, port, ih->group);
1397 break;
1398 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1399 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1400 break;
1401 case IGMP_HOST_MEMBERSHIP_QUERY:
1402 err = br_ip4_multicast_query(br, port, skb2);
1403 break;
1404 case IGMP_HOST_LEAVE_MESSAGE:
1405 br_ip4_multicast_leave_group(br, port, ih->group);
1406 break;
1407 }
1408
1409 out:
1410 __skb_push(skb2, offset);
1411 err_out:
1412 if (skb2 != skb)
1413 kfree_skb(skb2);
1414 return err;
1415 }
1416
1417 #if IS_ENABLED(CONFIG_IPV6)
1418 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1419 struct net_bridge_port *port,
1420 struct sk_buff *skb)
1421 {
1422 struct sk_buff *skb2;
1423 const struct ipv6hdr *ip6h;
1424 u8 icmp6_type;
1425 u8 nexthdr;
1426 __be16 frag_off;
1427 unsigned int len;
1428 int offset;
1429 int err;
1430
1431 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1432 return -EINVAL;
1433
1434 ip6h = ipv6_hdr(skb);
1435
1436 /*
1437 * We're interested in MLD messages only.
1438 * - Version is 6
1439 * - MLD has always Router Alert hop-by-hop option
1440 * - But we do not support jumbrograms.
1441 */
1442 if (ip6h->version != 6 ||
1443 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1444 ip6h->payload_len == 0)
1445 return 0;
1446
1447 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1448 if (skb->len < len)
1449 return -EINVAL;
1450
1451 nexthdr = ip6h->nexthdr;
1452 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1453
1454 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1455 return 0;
1456
1457 /* Okay, we found ICMPv6 header */
1458 skb2 = skb_clone(skb, GFP_ATOMIC);
1459 if (!skb2)
1460 return -ENOMEM;
1461
1462 err = -EINVAL;
1463 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1464 goto out;
1465
1466 len -= offset - skb_network_offset(skb2);
1467
1468 __skb_pull(skb2, offset);
1469 skb_reset_transport_header(skb2);
1470 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1471 skb_network_header_len(skb2));
1472
1473 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1474
1475 switch (icmp6_type) {
1476 case ICMPV6_MGM_QUERY:
1477 case ICMPV6_MGM_REPORT:
1478 case ICMPV6_MGM_REDUCTION:
1479 case ICMPV6_MLD2_REPORT:
1480 break;
1481 default:
1482 err = 0;
1483 goto out;
1484 }
1485
1486 /* Okay, we found MLD message. Check further. */
1487 if (skb2->len > len) {
1488 err = pskb_trim_rcsum(skb2, len);
1489 if (err)
1490 goto out;
1491 err = -EINVAL;
1492 }
1493
1494 ip6h = ipv6_hdr(skb2);
1495
1496 switch (skb2->ip_summed) {
1497 case CHECKSUM_COMPLETE:
1498 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1499 IPPROTO_ICMPV6, skb2->csum))
1500 break;
1501 /*FALLTHROUGH*/
1502 case CHECKSUM_NONE:
1503 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1504 &ip6h->daddr,
1505 skb2->len,
1506 IPPROTO_ICMPV6, 0));
1507 if (__skb_checksum_complete(skb2))
1508 goto out;
1509 }
1510
1511 err = 0;
1512
1513 BR_INPUT_SKB_CB(skb)->igmp = 1;
1514
1515 switch (icmp6_type) {
1516 case ICMPV6_MGM_REPORT:
1517 {
1518 struct mld_msg *mld;
1519 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1520 err = -EINVAL;
1521 goto out;
1522 }
1523 mld = (struct mld_msg *)skb_transport_header(skb2);
1524 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1525 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1526 break;
1527 }
1528 case ICMPV6_MLD2_REPORT:
1529 err = br_ip6_multicast_mld2_report(br, port, skb2);
1530 break;
1531 case ICMPV6_MGM_QUERY:
1532 err = br_ip6_multicast_query(br, port, skb2);
1533 break;
1534 case ICMPV6_MGM_REDUCTION:
1535 {
1536 struct mld_msg *mld;
1537 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1538 err = -EINVAL;
1539 goto out;
1540 }
1541 mld = (struct mld_msg *)skb_transport_header(skb2);
1542 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1543 }
1544 }
1545
1546 out:
1547 kfree_skb(skb2);
1548 return err;
1549 }
1550 #endif
1551
1552 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1553 struct sk_buff *skb)
1554 {
1555 BR_INPUT_SKB_CB(skb)->igmp = 0;
1556 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1557
1558 if (br->multicast_disabled)
1559 return 0;
1560
1561 switch (skb->protocol) {
1562 case htons(ETH_P_IP):
1563 return br_multicast_ipv4_rcv(br, port, skb);
1564 #if IS_ENABLED(CONFIG_IPV6)
1565 case htons(ETH_P_IPV6):
1566 return br_multicast_ipv6_rcv(br, port, skb);
1567 #endif
1568 }
1569
1570 return 0;
1571 }
1572
1573 static void br_multicast_query_expired(unsigned long data)
1574 {
1575 struct net_bridge *br = (void *)data;
1576
1577 spin_lock(&br->multicast_lock);
1578 if (br->multicast_startup_queries_sent <
1579 br->multicast_startup_query_count)
1580 br->multicast_startup_queries_sent++;
1581
1582 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1583
1584 spin_unlock(&br->multicast_lock);
1585 }
1586
1587 void br_multicast_init(struct net_bridge *br)
1588 {
1589 br->hash_elasticity = 4;
1590 br->hash_max = 512;
1591
1592 br->multicast_router = 1;
1593 br->multicast_querier = 0;
1594 br->multicast_last_member_count = 2;
1595 br->multicast_startup_query_count = 2;
1596
1597 br->multicast_last_member_interval = HZ;
1598 br->multicast_query_response_interval = 10 * HZ;
1599 br->multicast_startup_query_interval = 125 * HZ / 4;
1600 br->multicast_query_interval = 125 * HZ;
1601 br->multicast_querier_interval = 255 * HZ;
1602 br->multicast_membership_interval = 260 * HZ;
1603
1604 spin_lock_init(&br->multicast_lock);
1605 setup_timer(&br->multicast_router_timer,
1606 br_multicast_local_router_expired, 0);
1607 setup_timer(&br->multicast_querier_timer,
1608 br_multicast_querier_expired, (unsigned long)br);
1609 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1610 (unsigned long)br);
1611 }
1612
1613 void br_multicast_open(struct net_bridge *br)
1614 {
1615 br->multicast_startup_queries_sent = 0;
1616
1617 if (br->multicast_disabled)
1618 return;
1619
1620 mod_timer(&br->multicast_query_timer, jiffies);
1621 }
1622
1623 void br_multicast_stop(struct net_bridge *br)
1624 {
1625 struct net_bridge_mdb_htable *mdb;
1626 struct net_bridge_mdb_entry *mp;
1627 struct hlist_node *p, *n;
1628 u32 ver;
1629 int i;
1630
1631 del_timer_sync(&br->multicast_router_timer);
1632 del_timer_sync(&br->multicast_querier_timer);
1633 del_timer_sync(&br->multicast_query_timer);
1634
1635 spin_lock_bh(&br->multicast_lock);
1636 mdb = mlock_dereference(br->mdb, br);
1637 if (!mdb)
1638 goto out;
1639
1640 br->mdb = NULL;
1641
1642 ver = mdb->ver;
1643 for (i = 0; i < mdb->max; i++) {
1644 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1645 hlist[ver]) {
1646 del_timer(&mp->timer);
1647 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1648 }
1649 }
1650
1651 if (mdb->old) {
1652 spin_unlock_bh(&br->multicast_lock);
1653 rcu_barrier_bh();
1654 spin_lock_bh(&br->multicast_lock);
1655 WARN_ON(mdb->old);
1656 }
1657
1658 mdb->old = mdb;
1659 call_rcu_bh(&mdb->rcu, br_mdb_free);
1660
1661 out:
1662 spin_unlock_bh(&br->multicast_lock);
1663 }
1664
1665 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1666 {
1667 int err = -ENOENT;
1668
1669 spin_lock_bh(&br->multicast_lock);
1670 if (!netif_running(br->dev))
1671 goto unlock;
1672
1673 switch (val) {
1674 case 0:
1675 case 2:
1676 del_timer(&br->multicast_router_timer);
1677 /* fall through */
1678 case 1:
1679 br->multicast_router = val;
1680 err = 0;
1681 break;
1682
1683 default:
1684 err = -EINVAL;
1685 break;
1686 }
1687
1688 unlock:
1689 spin_unlock_bh(&br->multicast_lock);
1690
1691 return err;
1692 }
1693
1694 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1695 {
1696 struct net_bridge *br = p->br;
1697 int err = -ENOENT;
1698
1699 spin_lock(&br->multicast_lock);
1700 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1701 goto unlock;
1702
1703 switch (val) {
1704 case 0:
1705 case 1:
1706 case 2:
1707 p->multicast_router = val;
1708 err = 0;
1709
1710 if (val < 2 && !hlist_unhashed(&p->rlist))
1711 hlist_del_init_rcu(&p->rlist);
1712
1713 if (val == 1)
1714 break;
1715
1716 del_timer(&p->multicast_router_timer);
1717
1718 if (val == 0)
1719 break;
1720
1721 br_multicast_add_router(br, p);
1722 break;
1723
1724 default:
1725 err = -EINVAL;
1726 break;
1727 }
1728
1729 unlock:
1730 spin_unlock(&br->multicast_lock);
1731
1732 return err;
1733 }
1734
1735 static void br_multicast_start_querier(struct net_bridge *br)
1736 {
1737 struct net_bridge_port *port;
1738
1739 br_multicast_open(br);
1740
1741 list_for_each_entry(port, &br->port_list, list) {
1742 if (port->state == BR_STATE_DISABLED ||
1743 port->state == BR_STATE_BLOCKING)
1744 continue;
1745
1746 __br_multicast_enable_port(port);
1747 }
1748 }
1749
1750 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1751 {
1752 int err = 0;
1753 struct net_bridge_mdb_htable *mdb;
1754
1755 spin_lock_bh(&br->multicast_lock);
1756 if (br->multicast_disabled == !val)
1757 goto unlock;
1758
1759 br->multicast_disabled = !val;
1760 if (br->multicast_disabled)
1761 goto unlock;
1762
1763 if (!netif_running(br->dev))
1764 goto unlock;
1765
1766 mdb = mlock_dereference(br->mdb, br);
1767 if (mdb) {
1768 if (mdb->old) {
1769 err = -EEXIST;
1770 rollback:
1771 br->multicast_disabled = !!val;
1772 goto unlock;
1773 }
1774
1775 err = br_mdb_rehash(&br->mdb, mdb->max,
1776 br->hash_elasticity);
1777 if (err)
1778 goto rollback;
1779 }
1780
1781 br_multicast_start_querier(br);
1782
1783 unlock:
1784 spin_unlock_bh(&br->multicast_lock);
1785
1786 return err;
1787 }
1788
1789 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1790 {
1791 val = !!val;
1792
1793 spin_lock_bh(&br->multicast_lock);
1794 if (br->multicast_querier == val)
1795 goto unlock;
1796
1797 br->multicast_querier = val;
1798 if (val)
1799 br_multicast_start_querier(br);
1800
1801 unlock:
1802 spin_unlock_bh(&br->multicast_lock);
1803
1804 return 0;
1805 }
1806
1807 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1808 {
1809 int err = -ENOENT;
1810 u32 old;
1811 struct net_bridge_mdb_htable *mdb;
1812
1813 spin_lock(&br->multicast_lock);
1814 if (!netif_running(br->dev))
1815 goto unlock;
1816
1817 err = -EINVAL;
1818 if (!is_power_of_2(val))
1819 goto unlock;
1820
1821 mdb = mlock_dereference(br->mdb, br);
1822 if (mdb && val < mdb->size)
1823 goto unlock;
1824
1825 err = 0;
1826
1827 old = br->hash_max;
1828 br->hash_max = val;
1829
1830 if (mdb) {
1831 if (mdb->old) {
1832 err = -EEXIST;
1833 rollback:
1834 br->hash_max = old;
1835 goto unlock;
1836 }
1837
1838 err = br_mdb_rehash(&br->mdb, br->hash_max,
1839 br->hash_elasticity);
1840 if (err)
1841 goto rollback;
1842 }
1843
1844 unlock:
1845 spin_unlock(&br->multicast_lock);
1846
1847 return err;
1848 }
Linux kernel - Deliverables
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