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bridge: notify mdb changes via netlink
[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/addrconf.h>
31 #include <net/ip6_checksum.h>
32 #endif
33
34 #include "br_private.h"
35
36 #define mlock_dereference(X, br) \
37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
38
39 static void br_multicast_start_querier(struct net_bridge *br);
40 unsigned int br_mdb_rehash_seq;
41
42 #if IS_ENABLED(CONFIG_IPV6)
43 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
44 {
45 if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
46 return 1;
47 return 0;
48 }
49 #endif
50
51 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
52 {
53 if (a->proto != b->proto)
54 return 0;
55 switch (a->proto) {
56 case htons(ETH_P_IP):
57 return a->u.ip4 == b->u.ip4;
58 #if IS_ENABLED(CONFIG_IPV6)
59 case htons(ETH_P_IPV6):
60 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
61 #endif
62 }
63 return 0;
64 }
65
66 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
67 {
68 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
69 }
70
71 #if IS_ENABLED(CONFIG_IPV6)
72 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
73 const struct in6_addr *ip)
74 {
75 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
76 }
77 #endif
78
79 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
80 struct br_ip *ip)
81 {
82 switch (ip->proto) {
83 case htons(ETH_P_IP):
84 return __br_ip4_hash(mdb, ip->u.ip4);
85 #if IS_ENABLED(CONFIG_IPV6)
86 case htons(ETH_P_IPV6):
87 return __br_ip6_hash(mdb, &ip->u.ip6);
88 #endif
89 }
90 return 0;
91 }
92
93 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
94 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
95 {
96 struct net_bridge_mdb_entry *mp;
97 struct hlist_node *p;
98
99 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
100 if (br_ip_equal(&mp->addr, dst))
101 return mp;
102 }
103
104 return NULL;
105 }
106
107 static struct net_bridge_mdb_entry *br_mdb_ip_get(
108 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
109 {
110 if (!mdb)
111 return NULL;
112
113 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
114 }
115
116 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
117 struct net_bridge_mdb_htable *mdb, __be32 dst)
118 {
119 struct br_ip br_dst;
120
121 br_dst.u.ip4 = dst;
122 br_dst.proto = htons(ETH_P_IP);
123
124 return br_mdb_ip_get(mdb, &br_dst);
125 }
126
127 #if IS_ENABLED(CONFIG_IPV6)
128 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
129 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
130 {
131 struct br_ip br_dst;
132
133 br_dst.u.ip6 = *dst;
134 br_dst.proto = htons(ETH_P_IPV6);
135
136 return br_mdb_ip_get(mdb, &br_dst);
137 }
138 #endif
139
140 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
141 struct sk_buff *skb)
142 {
143 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
144 struct br_ip ip;
145
146 if (br->multicast_disabled)
147 return NULL;
148
149 if (BR_INPUT_SKB_CB(skb)->igmp)
150 return NULL;
151
152 ip.proto = skb->protocol;
153
154 switch (skb->protocol) {
155 case htons(ETH_P_IP):
156 ip.u.ip4 = ip_hdr(skb)->daddr;
157 break;
158 #if IS_ENABLED(CONFIG_IPV6)
159 case htons(ETH_P_IPV6):
160 ip.u.ip6 = ipv6_hdr(skb)->daddr;
161 break;
162 #endif
163 default:
164 return NULL;
165 }
166
167 return br_mdb_ip_get(mdb, &ip);
168 }
169
170 static void br_mdb_free(struct rcu_head *head)
171 {
172 struct net_bridge_mdb_htable *mdb =
173 container_of(head, struct net_bridge_mdb_htable, rcu);
174 struct net_bridge_mdb_htable *old = mdb->old;
175
176 mdb->old = NULL;
177 kfree(old->mhash);
178 kfree(old);
179 }
180
181 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
182 struct net_bridge_mdb_htable *old,
183 int elasticity)
184 {
185 struct net_bridge_mdb_entry *mp;
186 struct hlist_node *p;
187 int maxlen;
188 int len;
189 int i;
190
191 for (i = 0; i < old->max; i++)
192 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
193 hlist_add_head(&mp->hlist[new->ver],
194 &new->mhash[br_ip_hash(new, &mp->addr)]);
195
196 if (!elasticity)
197 return 0;
198
199 maxlen = 0;
200 for (i = 0; i < new->max; i++) {
201 len = 0;
202 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
203 len++;
204 if (len > maxlen)
205 maxlen = len;
206 }
207
208 return maxlen > elasticity ? -EINVAL : 0;
209 }
210
211 static void br_multicast_free_pg(struct rcu_head *head)
212 {
213 struct net_bridge_port_group *p =
214 container_of(head, struct net_bridge_port_group, rcu);
215
216 kfree(p);
217 }
218
219 static void br_multicast_free_group(struct rcu_head *head)
220 {
221 struct net_bridge_mdb_entry *mp =
222 container_of(head, struct net_bridge_mdb_entry, rcu);
223
224 kfree(mp);
225 }
226
227 static void br_multicast_group_expired(unsigned long data)
228 {
229 struct net_bridge_mdb_entry *mp = (void *)data;
230 struct net_bridge *br = mp->br;
231 struct net_bridge_mdb_htable *mdb;
232
233 spin_lock(&br->multicast_lock);
234 if (!netif_running(br->dev) || timer_pending(&mp->timer))
235 goto out;
236
237 mp->mglist = false;
238
239 if (mp->ports)
240 goto out;
241
242 mdb = mlock_dereference(br->mdb, br);
243
244 hlist_del_rcu(&mp->hlist[mdb->ver]);
245 mdb->size--;
246
247 call_rcu_bh(&mp->rcu, br_multicast_free_group);
248
249 out:
250 spin_unlock(&br->multicast_lock);
251 }
252
253 static void br_multicast_del_pg(struct net_bridge *br,
254 struct net_bridge_port_group *pg)
255 {
256 struct net_bridge_mdb_htable *mdb;
257 struct net_bridge_mdb_entry *mp;
258 struct net_bridge_port_group *p;
259 struct net_bridge_port_group __rcu **pp;
260
261 mdb = mlock_dereference(br->mdb, br);
262
263 mp = br_mdb_ip_get(mdb, &pg->addr);
264 if (WARN_ON(!mp))
265 return;
266
267 for (pp = &mp->ports;
268 (p = mlock_dereference(*pp, br)) != NULL;
269 pp = &p->next) {
270 if (p != pg)
271 continue;
272
273 rcu_assign_pointer(*pp, p->next);
274 hlist_del_init(&p->mglist);
275 del_timer(&p->timer);
276 call_rcu_bh(&p->rcu, br_multicast_free_pg);
277
278 if (!mp->ports && !mp->mglist &&
279 netif_running(br->dev))
280 mod_timer(&mp->timer, jiffies);
281
282 return;
283 }
284
285 WARN_ON(1);
286 }
287
288 static void br_multicast_port_group_expired(unsigned long data)
289 {
290 struct net_bridge_port_group *pg = (void *)data;
291 struct net_bridge *br = pg->port->br;
292
293 spin_lock(&br->multicast_lock);
294 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
295 hlist_unhashed(&pg->mglist))
296 goto out;
297
298 br_multicast_del_pg(br, pg);
299
300 out:
301 spin_unlock(&br->multicast_lock);
302 }
303
304 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
305 int elasticity)
306 {
307 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
308 struct net_bridge_mdb_htable *mdb;
309 int err;
310
311 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
312 if (!mdb)
313 return -ENOMEM;
314
315 mdb->max = max;
316 mdb->old = old;
317
318 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
319 if (!mdb->mhash) {
320 kfree(mdb);
321 return -ENOMEM;
322 }
323
324 mdb->size = old ? old->size : 0;
325 mdb->ver = old ? old->ver ^ 1 : 0;
326
327 if (!old || elasticity)
328 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
329 else
330 mdb->secret = old->secret;
331
332 if (!old)
333 goto out;
334
335 err = br_mdb_copy(mdb, old, elasticity);
336 if (err) {
337 kfree(mdb->mhash);
338 kfree(mdb);
339 return err;
340 }
341
342 br_mdb_rehash_seq++;
343 call_rcu_bh(&mdb->rcu, br_mdb_free);
344
345 out:
346 rcu_assign_pointer(*mdbp, mdb);
347
348 return 0;
349 }
350
351 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
352 __be32 group)
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
412 out:
413 return skb;
414 }
415
416 #if IS_ENABLED(CONFIG_IPV6)
417 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
418 const 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 eth->h_proto = htons(ETH_P_IPV6);
440 skb_put(skb, sizeof(*eth));
441
442 /* IPv6 header + HbH option */
443 skb_set_network_header(skb, skb->len);
444 ip6h = ipv6_hdr(skb);
445
446 *(__force __be32 *)ip6h = htonl(0x60000000);
447 ip6h->payload_len = htons(8 + sizeof(*mldq));
448 ip6h->nexthdr = IPPROTO_HOPOPTS;
449 ip6h->hop_limit = 1;
450 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
451 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
452 &ip6h->saddr)) {
453 kfree_skb(skb);
454 return NULL;
455 }
456 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
457
458 hopopt = (u8 *)(ip6h + 1);
459 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
460 hopopt[1] = 0; /* length of HbH */
461 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
462 hopopt[3] = 2; /* Length of RA Option */
463 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
464 hopopt[5] = 0;
465 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
466 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
467
468 skb_put(skb, sizeof(*ip6h) + 8);
469
470 /* ICMPv6 */
471 skb_set_transport_header(skb, skb->len);
472 mldq = (struct mld_msg *) icmp6_hdr(skb);
473
474 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
475 br->multicast_query_response_interval;
476
477 mldq->mld_type = ICMPV6_MGM_QUERY;
478 mldq->mld_code = 0;
479 mldq->mld_cksum = 0;
480 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
481 mldq->mld_reserved = 0;
482 mldq->mld_mca = *group;
483
484 /* checksum */
485 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
486 sizeof(*mldq), IPPROTO_ICMPV6,
487 csum_partial(mldq,
488 sizeof(*mldq), 0));
489 skb_put(skb, sizeof(*mldq));
490
491 __skb_pull(skb, sizeof(*eth));
492
493 out:
494 return skb;
495 }
496 #endif
497
498 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
499 struct br_ip *addr)
500 {
501 switch (addr->proto) {
502 case htons(ETH_P_IP):
503 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
504 #if IS_ENABLED(CONFIG_IPV6)
505 case htons(ETH_P_IPV6):
506 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
507 #endif
508 }
509 return NULL;
510 }
511
512 static struct net_bridge_mdb_entry *br_multicast_get_group(
513 struct net_bridge *br, struct net_bridge_port *port,
514 struct br_ip *group, int hash)
515 {
516 struct net_bridge_mdb_htable *mdb;
517 struct net_bridge_mdb_entry *mp;
518 struct hlist_node *p;
519 unsigned int count = 0;
520 unsigned int max;
521 int elasticity;
522 int err;
523
524 mdb = rcu_dereference_protected(br->mdb, 1);
525 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
526 count++;
527 if (unlikely(br_ip_equal(group, &mp->addr)))
528 return mp;
529 }
530
531 elasticity = 0;
532 max = mdb->max;
533
534 if (unlikely(count > br->hash_elasticity && count)) {
535 if (net_ratelimit())
536 br_info(br, "Multicast hash table "
537 "chain limit reached: %s\n",
538 port ? port->dev->name : br->dev->name);
539
540 elasticity = br->hash_elasticity;
541 }
542
543 if (mdb->size >= max) {
544 max *= 2;
545 if (unlikely(max > br->hash_max)) {
546 br_warn(br, "Multicast hash table maximum of %d "
547 "reached, disabling snooping: %s\n",
548 br->hash_max,
549 port ? port->dev->name : br->dev->name);
550 err = -E2BIG;
551 disable:
552 br->multicast_disabled = 1;
553 goto err;
554 }
555 }
556
557 if (max > mdb->max || elasticity) {
558 if (mdb->old) {
559 if (net_ratelimit())
560 br_info(br, "Multicast hash table "
561 "on fire: %s\n",
562 port ? port->dev->name : br->dev->name);
563 err = -EEXIST;
564 goto err;
565 }
566
567 err = br_mdb_rehash(&br->mdb, max, elasticity);
568 if (err) {
569 br_warn(br, "Cannot rehash multicast "
570 "hash table, disabling snooping: %s, %d, %d\n",
571 port ? port->dev->name : br->dev->name,
572 mdb->size, err);
573 goto disable;
574 }
575
576 err = -EAGAIN;
577 goto err;
578 }
579
580 return NULL;
581
582 err:
583 mp = ERR_PTR(err);
584 return mp;
585 }
586
587 static struct net_bridge_mdb_entry *br_multicast_new_group(
588 struct net_bridge *br, struct net_bridge_port *port,
589 struct br_ip *group)
590 {
591 struct net_bridge_mdb_htable *mdb;
592 struct net_bridge_mdb_entry *mp;
593 int hash;
594 int err;
595
596 mdb = rcu_dereference_protected(br->mdb, 1);
597 if (!mdb) {
598 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
599 if (err)
600 return ERR_PTR(err);
601 goto rehash;
602 }
603
604 hash = br_ip_hash(mdb, group);
605 mp = br_multicast_get_group(br, port, group, hash);
606 switch (PTR_ERR(mp)) {
607 case 0:
608 break;
609
610 case -EAGAIN:
611 rehash:
612 mdb = rcu_dereference_protected(br->mdb, 1);
613 hash = br_ip_hash(mdb, group);
614 break;
615
616 default:
617 goto out;
618 }
619
620 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
621 if (unlikely(!mp))
622 return ERR_PTR(-ENOMEM);
623
624 mp->br = br;
625 mp->addr = *group;
626 setup_timer(&mp->timer, br_multicast_group_expired,
627 (unsigned long)mp);
628
629 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
630 mdb->size++;
631
632 out:
633 return mp;
634 }
635
636 static int br_multicast_add_group(struct net_bridge *br,
637 struct net_bridge_port *port,
638 struct br_ip *group)
639 {
640 struct net_bridge_mdb_entry *mp;
641 struct net_bridge_port_group *p;
642 struct net_bridge_port_group __rcu **pp;
643 unsigned long now = jiffies;
644 int err;
645
646 spin_lock(&br->multicast_lock);
647 if (!netif_running(br->dev) ||
648 (port && port->state == BR_STATE_DISABLED))
649 goto out;
650
651 mp = br_multicast_new_group(br, port, group);
652 err = PTR_ERR(mp);
653 if (IS_ERR(mp))
654 goto err;
655
656 if (!port) {
657 mp->mglist = true;
658 mod_timer(&mp->timer, now + br->multicast_membership_interval);
659 goto out;
660 }
661
662 for (pp = &mp->ports;
663 (p = mlock_dereference(*pp, br)) != NULL;
664 pp = &p->next) {
665 if (p->port == port)
666 goto found;
667 if ((unsigned long)p->port < (unsigned long)port)
668 break;
669 }
670
671 p = kzalloc(sizeof(*p), GFP_ATOMIC);
672 err = -ENOMEM;
673 if (unlikely(!p))
674 goto err;
675
676 p->addr = *group;
677 p->port = port;
678 p->next = *pp;
679 hlist_add_head(&p->mglist, &port->mglist);
680 setup_timer(&p->timer, br_multicast_port_group_expired,
681 (unsigned long)p);
682
683 rcu_assign_pointer(*pp, p);
684 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
685
686 found:
687 mod_timer(&p->timer, now + br->multicast_membership_interval);
688 out:
689 err = 0;
690
691 err:
692 spin_unlock(&br->multicast_lock);
693 return err;
694 }
695
696 static int br_ip4_multicast_add_group(struct net_bridge *br,
697 struct net_bridge_port *port,
698 __be32 group)
699 {
700 struct br_ip br_group;
701
702 if (ipv4_is_local_multicast(group))
703 return 0;
704
705 br_group.u.ip4 = group;
706 br_group.proto = htons(ETH_P_IP);
707
708 return br_multicast_add_group(br, port, &br_group);
709 }
710
711 #if IS_ENABLED(CONFIG_IPV6)
712 static int br_ip6_multicast_add_group(struct net_bridge *br,
713 struct net_bridge_port *port,
714 const struct in6_addr *group)
715 {
716 struct br_ip br_group;
717
718 if (!ipv6_is_transient_multicast(group))
719 return 0;
720
721 br_group.u.ip6 = *group;
722 br_group.proto = htons(ETH_P_IPV6);
723
724 return br_multicast_add_group(br, port, &br_group);
725 }
726 #endif
727
728 static void br_multicast_router_expired(unsigned long data)
729 {
730 struct net_bridge_port *port = (void *)data;
731 struct net_bridge *br = port->br;
732
733 spin_lock(&br->multicast_lock);
734 if (port->multicast_router != 1 ||
735 timer_pending(&port->multicast_router_timer) ||
736 hlist_unhashed(&port->rlist))
737 goto out;
738
739 hlist_del_init_rcu(&port->rlist);
740
741 out:
742 spin_unlock(&br->multicast_lock);
743 }
744
745 static void br_multicast_local_router_expired(unsigned long data)
746 {
747 }
748
749 static void br_multicast_querier_expired(unsigned long data)
750 {
751 struct net_bridge *br = (void *)data;
752
753 spin_lock(&br->multicast_lock);
754 if (!netif_running(br->dev) || br->multicast_disabled)
755 goto out;
756
757 br_multicast_start_querier(br);
758
759 out:
760 spin_unlock(&br->multicast_lock);
761 }
762
763 static void __br_multicast_send_query(struct net_bridge *br,
764 struct net_bridge_port *port,
765 struct br_ip *ip)
766 {
767 struct sk_buff *skb;
768
769 skb = br_multicast_alloc_query(br, ip);
770 if (!skb)
771 return;
772
773 if (port) {
774 __skb_push(skb, sizeof(struct ethhdr));
775 skb->dev = port->dev;
776 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
777 dev_queue_xmit);
778 } else
779 netif_rx(skb);
780 }
781
782 static void br_multicast_send_query(struct net_bridge *br,
783 struct net_bridge_port *port, u32 sent)
784 {
785 unsigned long time;
786 struct br_ip br_group;
787
788 if (!netif_running(br->dev) || br->multicast_disabled ||
789 !br->multicast_querier ||
790 timer_pending(&br->multicast_querier_timer))
791 return;
792
793 memset(&br_group.u, 0, sizeof(br_group.u));
794
795 br_group.proto = htons(ETH_P_IP);
796 __br_multicast_send_query(br, port, &br_group);
797
798 #if IS_ENABLED(CONFIG_IPV6)
799 br_group.proto = htons(ETH_P_IPV6);
800 __br_multicast_send_query(br, port, &br_group);
801 #endif
802
803 time = jiffies;
804 time += sent < br->multicast_startup_query_count ?
805 br->multicast_startup_query_interval :
806 br->multicast_query_interval;
807 mod_timer(port ? &port->multicast_query_timer :
808 &br->multicast_query_timer, time);
809 }
810
811 static void br_multicast_port_query_expired(unsigned long data)
812 {
813 struct net_bridge_port *port = (void *)data;
814 struct net_bridge *br = port->br;
815
816 spin_lock(&br->multicast_lock);
817 if (port->state == BR_STATE_DISABLED ||
818 port->state == BR_STATE_BLOCKING)
819 goto out;
820
821 if (port->multicast_startup_queries_sent <
822 br->multicast_startup_query_count)
823 port->multicast_startup_queries_sent++;
824
825 br_multicast_send_query(port->br, port,
826 port->multicast_startup_queries_sent);
827
828 out:
829 spin_unlock(&br->multicast_lock);
830 }
831
832 void br_multicast_add_port(struct net_bridge_port *port)
833 {
834 port->multicast_router = 1;
835
836 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
837 (unsigned long)port);
838 setup_timer(&port->multicast_query_timer,
839 br_multicast_port_query_expired, (unsigned long)port);
840 }
841
842 void br_multicast_del_port(struct net_bridge_port *port)
843 {
844 del_timer_sync(&port->multicast_router_timer);
845 }
846
847 static void __br_multicast_enable_port(struct net_bridge_port *port)
848 {
849 port->multicast_startup_queries_sent = 0;
850
851 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
852 del_timer(&port->multicast_query_timer))
853 mod_timer(&port->multicast_query_timer, jiffies);
854 }
855
856 void br_multicast_enable_port(struct net_bridge_port *port)
857 {
858 struct net_bridge *br = port->br;
859
860 spin_lock(&br->multicast_lock);
861 if (br->multicast_disabled || !netif_running(br->dev))
862 goto out;
863
864 __br_multicast_enable_port(port);
865
866 out:
867 spin_unlock(&br->multicast_lock);
868 }
869
870 void br_multicast_disable_port(struct net_bridge_port *port)
871 {
872 struct net_bridge *br = port->br;
873 struct net_bridge_port_group *pg;
874 struct hlist_node *p, *n;
875
876 spin_lock(&br->multicast_lock);
877 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
878 br_multicast_del_pg(br, pg);
879
880 if (!hlist_unhashed(&port->rlist))
881 hlist_del_init_rcu(&port->rlist);
882 del_timer(&port->multicast_router_timer);
883 del_timer(&port->multicast_query_timer);
884 spin_unlock(&br->multicast_lock);
885 }
886
887 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
888 struct net_bridge_port *port,
889 struct sk_buff *skb)
890 {
891 struct igmpv3_report *ih;
892 struct igmpv3_grec *grec;
893 int i;
894 int len;
895 int num;
896 int type;
897 int err = 0;
898 __be32 group;
899
900 if (!pskb_may_pull(skb, sizeof(*ih)))
901 return -EINVAL;
902
903 ih = igmpv3_report_hdr(skb);
904 num = ntohs(ih->ngrec);
905 len = sizeof(*ih);
906
907 for (i = 0; i < num; i++) {
908 len += sizeof(*grec);
909 if (!pskb_may_pull(skb, len))
910 return -EINVAL;
911
912 grec = (void *)(skb->data + len - sizeof(*grec));
913 group = grec->grec_mca;
914 type = grec->grec_type;
915
916 len += ntohs(grec->grec_nsrcs) * 4;
917 if (!pskb_may_pull(skb, len))
918 return -EINVAL;
919
920 /* We treat this as an IGMPv2 report for now. */
921 switch (type) {
922 case IGMPV3_MODE_IS_INCLUDE:
923 case IGMPV3_MODE_IS_EXCLUDE:
924 case IGMPV3_CHANGE_TO_INCLUDE:
925 case IGMPV3_CHANGE_TO_EXCLUDE:
926 case IGMPV3_ALLOW_NEW_SOURCES:
927 case IGMPV3_BLOCK_OLD_SOURCES:
928 break;
929
930 default:
931 continue;
932 }
933
934 err = br_ip4_multicast_add_group(br, port, group);
935 if (err)
936 break;
937 }
938
939 return err;
940 }
941
942 #if IS_ENABLED(CONFIG_IPV6)
943 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
944 struct net_bridge_port *port,
945 struct sk_buff *skb)
946 {
947 struct icmp6hdr *icmp6h;
948 struct mld2_grec *grec;
949 int i;
950 int len;
951 int num;
952 int err = 0;
953
954 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
955 return -EINVAL;
956
957 icmp6h = icmp6_hdr(skb);
958 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
959 len = sizeof(*icmp6h);
960
961 for (i = 0; i < num; i++) {
962 __be16 *nsrcs, _nsrcs;
963
964 nsrcs = skb_header_pointer(skb,
965 len + offsetof(struct mld2_grec,
966 grec_nsrcs),
967 sizeof(_nsrcs), &_nsrcs);
968 if (!nsrcs)
969 return -EINVAL;
970
971 if (!pskb_may_pull(skb,
972 len + sizeof(*grec) +
973 sizeof(struct in6_addr) * ntohs(*nsrcs)))
974 return -EINVAL;
975
976 grec = (struct mld2_grec *)(skb->data + len);
977 len += sizeof(*grec) +
978 sizeof(struct in6_addr) * ntohs(*nsrcs);
979
980 /* We treat these as MLDv1 reports for now. */
981 switch (grec->grec_type) {
982 case MLD2_MODE_IS_INCLUDE:
983 case MLD2_MODE_IS_EXCLUDE:
984 case MLD2_CHANGE_TO_INCLUDE:
985 case MLD2_CHANGE_TO_EXCLUDE:
986 case MLD2_ALLOW_NEW_SOURCES:
987 case MLD2_BLOCK_OLD_SOURCES:
988 break;
989
990 default:
991 continue;
992 }
993
994 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
995 if (!err)
996 break;
997 }
998
999 return err;
1000 }
1001 #endif
1002
1003 /*
1004 * Add port to rotuer_list
1005 * list is maintained ordered by pointer value
1006 * and locked by br->multicast_lock and RCU
1007 */
1008 static void br_multicast_add_router(struct net_bridge *br,
1009 struct net_bridge_port *port)
1010 {
1011 struct net_bridge_port *p;
1012 struct hlist_node *n, *slot = NULL;
1013
1014 hlist_for_each_entry(p, n, &br->router_list, rlist) {
1015 if ((unsigned long) port >= (unsigned long) p)
1016 break;
1017 slot = n;
1018 }
1019
1020 if (slot)
1021 hlist_add_after_rcu(slot, &port->rlist);
1022 else
1023 hlist_add_head_rcu(&port->rlist, &br->router_list);
1024 }
1025
1026 static void br_multicast_mark_router(struct net_bridge *br,
1027 struct net_bridge_port *port)
1028 {
1029 unsigned long now = jiffies;
1030
1031 if (!port) {
1032 if (br->multicast_router == 1)
1033 mod_timer(&br->multicast_router_timer,
1034 now + br->multicast_querier_interval);
1035 return;
1036 }
1037
1038 if (port->multicast_router != 1)
1039 return;
1040
1041 if (!hlist_unhashed(&port->rlist))
1042 goto timer;
1043
1044 br_multicast_add_router(br, port);
1045
1046 timer:
1047 mod_timer(&port->multicast_router_timer,
1048 now + br->multicast_querier_interval);
1049 }
1050
1051 static void br_multicast_query_received(struct net_bridge *br,
1052 struct net_bridge_port *port,
1053 int saddr)
1054 {
1055 if (saddr)
1056 mod_timer(&br->multicast_querier_timer,
1057 jiffies + br->multicast_querier_interval);
1058 else if (timer_pending(&br->multicast_querier_timer))
1059 return;
1060
1061 br_multicast_mark_router(br, port);
1062 }
1063
1064 static int br_ip4_multicast_query(struct net_bridge *br,
1065 struct net_bridge_port *port,
1066 struct sk_buff *skb)
1067 {
1068 const struct iphdr *iph = ip_hdr(skb);
1069 struct igmphdr *ih = igmp_hdr(skb);
1070 struct net_bridge_mdb_entry *mp;
1071 struct igmpv3_query *ih3;
1072 struct net_bridge_port_group *p;
1073 struct net_bridge_port_group __rcu **pp;
1074 unsigned long max_delay;
1075 unsigned long now = jiffies;
1076 __be32 group;
1077 int err = 0;
1078
1079 spin_lock(&br->multicast_lock);
1080 if (!netif_running(br->dev) ||
1081 (port && port->state == BR_STATE_DISABLED))
1082 goto out;
1083
1084 br_multicast_query_received(br, port, !!iph->saddr);
1085
1086 group = ih->group;
1087
1088 if (skb->len == sizeof(*ih)) {
1089 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1090
1091 if (!max_delay) {
1092 max_delay = 10 * HZ;
1093 group = 0;
1094 }
1095 } else {
1096 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1097 err = -EINVAL;
1098 goto out;
1099 }
1100
1101 ih3 = igmpv3_query_hdr(skb);
1102 if (ih3->nsrcs)
1103 goto out;
1104
1105 max_delay = ih3->code ?
1106 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1107 }
1108
1109 if (!group)
1110 goto out;
1111
1112 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
1113 if (!mp)
1114 goto out;
1115
1116 max_delay *= br->multicast_last_member_count;
1117
1118 if (mp->mglist &&
1119 (timer_pending(&mp->timer) ?
1120 time_after(mp->timer.expires, now + max_delay) :
1121 try_to_del_timer_sync(&mp->timer) >= 0))
1122 mod_timer(&mp->timer, now + max_delay);
1123
1124 for (pp = &mp->ports;
1125 (p = mlock_dereference(*pp, br)) != NULL;
1126 pp = &p->next) {
1127 if (timer_pending(&p->timer) ?
1128 time_after(p->timer.expires, now + max_delay) :
1129 try_to_del_timer_sync(&p->timer) >= 0)
1130 mod_timer(&p->timer, now + max_delay);
1131 }
1132
1133 out:
1134 spin_unlock(&br->multicast_lock);
1135 return err;
1136 }
1137
1138 #if IS_ENABLED(CONFIG_IPV6)
1139 static int br_ip6_multicast_query(struct net_bridge *br,
1140 struct net_bridge_port *port,
1141 struct sk_buff *skb)
1142 {
1143 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1144 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1145 struct net_bridge_mdb_entry *mp;
1146 struct mld2_query *mld2q;
1147 struct net_bridge_port_group *p;
1148 struct net_bridge_port_group __rcu **pp;
1149 unsigned long max_delay;
1150 unsigned long now = jiffies;
1151 const struct in6_addr *group = NULL;
1152 int err = 0;
1153
1154 spin_lock(&br->multicast_lock);
1155 if (!netif_running(br->dev) ||
1156 (port && port->state == BR_STATE_DISABLED))
1157 goto out;
1158
1159 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1160
1161 if (skb->len == sizeof(*mld)) {
1162 if (!pskb_may_pull(skb, sizeof(*mld))) {
1163 err = -EINVAL;
1164 goto out;
1165 }
1166 mld = (struct mld_msg *) icmp6_hdr(skb);
1167 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1168 if (max_delay)
1169 group = &mld->mld_mca;
1170 } else if (skb->len >= sizeof(*mld2q)) {
1171 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1172 err = -EINVAL;
1173 goto out;
1174 }
1175 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1176 if (!mld2q->mld2q_nsrcs)
1177 group = &mld2q->mld2q_mca;
1178 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1179 }
1180
1181 if (!group)
1182 goto out;
1183
1184 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
1185 if (!mp)
1186 goto out;
1187
1188 max_delay *= br->multicast_last_member_count;
1189 if (mp->mglist &&
1190 (timer_pending(&mp->timer) ?
1191 time_after(mp->timer.expires, now + max_delay) :
1192 try_to_del_timer_sync(&mp->timer) >= 0))
1193 mod_timer(&mp->timer, now + max_delay);
1194
1195 for (pp = &mp->ports;
1196 (p = mlock_dereference(*pp, br)) != NULL;
1197 pp = &p->next) {
1198 if (timer_pending(&p->timer) ?
1199 time_after(p->timer.expires, now + max_delay) :
1200 try_to_del_timer_sync(&p->timer) >= 0)
1201 mod_timer(&p->timer, now + max_delay);
1202 }
1203
1204 out:
1205 spin_unlock(&br->multicast_lock);
1206 return err;
1207 }
1208 #endif
1209
1210 static void br_multicast_leave_group(struct net_bridge *br,
1211 struct net_bridge_port *port,
1212 struct br_ip *group)
1213 {
1214 struct net_bridge_mdb_htable *mdb;
1215 struct net_bridge_mdb_entry *mp;
1216 struct net_bridge_port_group *p;
1217 unsigned long now;
1218 unsigned long time;
1219
1220 spin_lock(&br->multicast_lock);
1221 if (!netif_running(br->dev) ||
1222 (port && port->state == BR_STATE_DISABLED) ||
1223 timer_pending(&br->multicast_querier_timer))
1224 goto out;
1225
1226 mdb = mlock_dereference(br->mdb, br);
1227 mp = br_mdb_ip_get(mdb, group);
1228 if (!mp)
1229 goto out;
1230
1231 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1232 struct net_bridge_port_group __rcu **pp;
1233
1234 for (pp = &mp->ports;
1235 (p = mlock_dereference(*pp, br)) != NULL;
1236 pp = &p->next) {
1237 if (p->port != port)
1238 continue;
1239
1240 rcu_assign_pointer(*pp, p->next);
1241 hlist_del_init(&p->mglist);
1242 del_timer(&p->timer);
1243 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1244 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1245
1246 if (!mp->ports && !mp->mglist &&
1247 netif_running(br->dev))
1248 mod_timer(&mp->timer, jiffies);
1249 }
1250 goto out;
1251 }
1252
1253 now = jiffies;
1254 time = now + br->multicast_last_member_count *
1255 br->multicast_last_member_interval;
1256
1257 if (!port) {
1258 if (mp->mglist &&
1259 (timer_pending(&mp->timer) ?
1260 time_after(mp->timer.expires, time) :
1261 try_to_del_timer_sync(&mp->timer) >= 0)) {
1262 mod_timer(&mp->timer, time);
1263 }
1264
1265 goto out;
1266 }
1267
1268 for (p = mlock_dereference(mp->ports, br);
1269 p != NULL;
1270 p = mlock_dereference(p->next, br)) {
1271 if (p->port != port)
1272 continue;
1273
1274 if (!hlist_unhashed(&p->mglist) &&
1275 (timer_pending(&p->timer) ?
1276 time_after(p->timer.expires, time) :
1277 try_to_del_timer_sync(&p->timer) >= 0)) {
1278 mod_timer(&p->timer, time);
1279 }
1280
1281 break;
1282 }
1283
1284 out:
1285 spin_unlock(&br->multicast_lock);
1286 }
1287
1288 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1289 struct net_bridge_port *port,
1290 __be32 group)
1291 {
1292 struct br_ip br_group;
1293
1294 if (ipv4_is_local_multicast(group))
1295 return;
1296
1297 br_group.u.ip4 = group;
1298 br_group.proto = htons(ETH_P_IP);
1299
1300 br_multicast_leave_group(br, port, &br_group);
1301 }
1302
1303 #if IS_ENABLED(CONFIG_IPV6)
1304 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1305 struct net_bridge_port *port,
1306 const struct in6_addr *group)
1307 {
1308 struct br_ip br_group;
1309
1310 if (!ipv6_is_transient_multicast(group))
1311 return;
1312
1313 br_group.u.ip6 = *group;
1314 br_group.proto = htons(ETH_P_IPV6);
1315
1316 br_multicast_leave_group(br, port, &br_group);
1317 }
1318 #endif
1319
1320 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1321 struct net_bridge_port *port,
1322 struct sk_buff *skb)
1323 {
1324 struct sk_buff *skb2 = skb;
1325 const struct iphdr *iph;
1326 struct igmphdr *ih;
1327 unsigned int len;
1328 unsigned int offset;
1329 int err;
1330
1331 /* We treat OOM as packet loss for now. */
1332 if (!pskb_may_pull(skb, sizeof(*iph)))
1333 return -EINVAL;
1334
1335 iph = ip_hdr(skb);
1336
1337 if (iph->ihl < 5 || iph->version != 4)
1338 return -EINVAL;
1339
1340 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1341 return -EINVAL;
1342
1343 iph = ip_hdr(skb);
1344
1345 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1346 return -EINVAL;
1347
1348 if (iph->protocol != IPPROTO_IGMP) {
1349 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
1350 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1351 return 0;
1352 }
1353
1354 len = ntohs(iph->tot_len);
1355 if (skb->len < len || len < ip_hdrlen(skb))
1356 return -EINVAL;
1357
1358 if (skb->len > len) {
1359 skb2 = skb_clone(skb, GFP_ATOMIC);
1360 if (!skb2)
1361 return -ENOMEM;
1362
1363 err = pskb_trim_rcsum(skb2, len);
1364 if (err)
1365 goto err_out;
1366 }
1367
1368 len -= ip_hdrlen(skb2);
1369 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1370 __skb_pull(skb2, offset);
1371 skb_reset_transport_header(skb2);
1372
1373 err = -EINVAL;
1374 if (!pskb_may_pull(skb2, sizeof(*ih)))
1375 goto out;
1376
1377 switch (skb2->ip_summed) {
1378 case CHECKSUM_COMPLETE:
1379 if (!csum_fold(skb2->csum))
1380 break;
1381 /* fall through */
1382 case CHECKSUM_NONE:
1383 skb2->csum = 0;
1384 if (skb_checksum_complete(skb2))
1385 goto out;
1386 }
1387
1388 err = 0;
1389
1390 BR_INPUT_SKB_CB(skb)->igmp = 1;
1391 ih = igmp_hdr(skb2);
1392
1393 switch (ih->type) {
1394 case IGMP_HOST_MEMBERSHIP_REPORT:
1395 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1396 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1397 err = br_ip4_multicast_add_group(br, port, ih->group);
1398 break;
1399 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1400 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1401 break;
1402 case IGMP_HOST_MEMBERSHIP_QUERY:
1403 err = br_ip4_multicast_query(br, port, skb2);
1404 break;
1405 case IGMP_HOST_LEAVE_MESSAGE:
1406 br_ip4_multicast_leave_group(br, port, ih->group);
1407 break;
1408 }
1409
1410 out:
1411 __skb_push(skb2, offset);
1412 err_out:
1413 if (skb2 != skb)
1414 kfree_skb(skb2);
1415 return err;
1416 }
1417
1418 #if IS_ENABLED(CONFIG_IPV6)
1419 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1420 struct net_bridge_port *port,
1421 struct sk_buff *skb)
1422 {
1423 struct sk_buff *skb2;
1424 const struct ipv6hdr *ip6h;
1425 u8 icmp6_type;
1426 u8 nexthdr;
1427 __be16 frag_off;
1428 unsigned int len;
1429 int offset;
1430 int err;
1431
1432 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1433 return -EINVAL;
1434
1435 ip6h = ipv6_hdr(skb);
1436
1437 /*
1438 * We're interested in MLD messages only.
1439 * - Version is 6
1440 * - MLD has always Router Alert hop-by-hop option
1441 * - But we do not support jumbrograms.
1442 */
1443 if (ip6h->version != 6 ||
1444 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1445 ip6h->payload_len == 0)
1446 return 0;
1447
1448 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1449 if (skb->len < len)
1450 return -EINVAL;
1451
1452 nexthdr = ip6h->nexthdr;
1453 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1454
1455 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1456 return 0;
1457
1458 /* Okay, we found ICMPv6 header */
1459 skb2 = skb_clone(skb, GFP_ATOMIC);
1460 if (!skb2)
1461 return -ENOMEM;
1462
1463 err = -EINVAL;
1464 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1465 goto out;
1466
1467 len -= offset - skb_network_offset(skb2);
1468
1469 __skb_pull(skb2, offset);
1470 skb_reset_transport_header(skb2);
1471 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1472 skb_network_header_len(skb2));
1473
1474 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1475
1476 switch (icmp6_type) {
1477 case ICMPV6_MGM_QUERY:
1478 case ICMPV6_MGM_REPORT:
1479 case ICMPV6_MGM_REDUCTION:
1480 case ICMPV6_MLD2_REPORT:
1481 break;
1482 default:
1483 err = 0;
1484 goto out;
1485 }
1486
1487 /* Okay, we found MLD message. Check further. */
1488 if (skb2->len > len) {
1489 err = pskb_trim_rcsum(skb2, len);
1490 if (err)
1491 goto out;
1492 err = -EINVAL;
1493 }
1494
1495 ip6h = ipv6_hdr(skb2);
1496
1497 switch (skb2->ip_summed) {
1498 case CHECKSUM_COMPLETE:
1499 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1500 IPPROTO_ICMPV6, skb2->csum))
1501 break;
1502 /*FALLTHROUGH*/
1503 case CHECKSUM_NONE:
1504 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1505 &ip6h->daddr,
1506 skb2->len,
1507 IPPROTO_ICMPV6, 0));
1508 if (__skb_checksum_complete(skb2))
1509 goto out;
1510 }
1511
1512 err = 0;
1513
1514 BR_INPUT_SKB_CB(skb)->igmp = 1;
1515
1516 switch (icmp6_type) {
1517 case ICMPV6_MGM_REPORT:
1518 {
1519 struct mld_msg *mld;
1520 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1521 err = -EINVAL;
1522 goto out;
1523 }
1524 mld = (struct mld_msg *)skb_transport_header(skb2);
1525 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1526 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1527 break;
1528 }
1529 case ICMPV6_MLD2_REPORT:
1530 err = br_ip6_multicast_mld2_report(br, port, skb2);
1531 break;
1532 case ICMPV6_MGM_QUERY:
1533 err = br_ip6_multicast_query(br, port, skb2);
1534 break;
1535 case ICMPV6_MGM_REDUCTION:
1536 {
1537 struct mld_msg *mld;
1538 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1539 err = -EINVAL;
1540 goto out;
1541 }
1542 mld = (struct mld_msg *)skb_transport_header(skb2);
1543 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1544 }
1545 }
1546
1547 out:
1548 kfree_skb(skb2);
1549 return err;
1550 }
1551 #endif
1552
1553 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1554 struct sk_buff *skb)
1555 {
1556 BR_INPUT_SKB_CB(skb)->igmp = 0;
1557 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1558
1559 if (br->multicast_disabled)
1560 return 0;
1561
1562 switch (skb->protocol) {
1563 case htons(ETH_P_IP):
1564 return br_multicast_ipv4_rcv(br, port, skb);
1565 #if IS_ENABLED(CONFIG_IPV6)
1566 case htons(ETH_P_IPV6):
1567 return br_multicast_ipv6_rcv(br, port, skb);
1568 #endif
1569 }
1570
1571 return 0;
1572 }
1573
1574 static void br_multicast_query_expired(unsigned long data)
1575 {
1576 struct net_bridge *br = (void *)data;
1577
1578 spin_lock(&br->multicast_lock);
1579 if (br->multicast_startup_queries_sent <
1580 br->multicast_startup_query_count)
1581 br->multicast_startup_queries_sent++;
1582
1583 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1584
1585 spin_unlock(&br->multicast_lock);
1586 }
1587
1588 void br_multicast_init(struct net_bridge *br)
1589 {
1590 br->hash_elasticity = 4;
1591 br->hash_max = 512;
1592
1593 br->multicast_router = 1;
1594 br->multicast_querier = 0;
1595 br->multicast_last_member_count = 2;
1596 br->multicast_startup_query_count = 2;
1597
1598 br->multicast_last_member_interval = HZ;
1599 br->multicast_query_response_interval = 10 * HZ;
1600 br->multicast_startup_query_interval = 125 * HZ / 4;
1601 br->multicast_query_interval = 125 * HZ;
1602 br->multicast_querier_interval = 255 * HZ;
1603 br->multicast_membership_interval = 260 * HZ;
1604
1605 spin_lock_init(&br->multicast_lock);
1606 setup_timer(&br->multicast_router_timer,
1607 br_multicast_local_router_expired, 0);
1608 setup_timer(&br->multicast_querier_timer,
1609 br_multicast_querier_expired, (unsigned long)br);
1610 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1611 (unsigned long)br);
1612 br_mdb_init();
1613 }
1614
1615 void br_multicast_open(struct net_bridge *br)
1616 {
1617 br->multicast_startup_queries_sent = 0;
1618
1619 if (br->multicast_disabled)
1620 return;
1621
1622 mod_timer(&br->multicast_query_timer, jiffies);
1623 }
1624
1625 void br_multicast_stop(struct net_bridge *br)
1626 {
1627 struct net_bridge_mdb_htable *mdb;
1628 struct net_bridge_mdb_entry *mp;
1629 struct hlist_node *p, *n;
1630 u32 ver;
1631 int i;
1632
1633 del_timer_sync(&br->multicast_router_timer);
1634 del_timer_sync(&br->multicast_querier_timer);
1635 del_timer_sync(&br->multicast_query_timer);
1636
1637 spin_lock_bh(&br->multicast_lock);
1638 mdb = mlock_dereference(br->mdb, br);
1639 if (!mdb)
1640 goto out;
1641
1642 br->mdb = NULL;
1643
1644 ver = mdb->ver;
1645 for (i = 0; i < mdb->max; i++) {
1646 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1647 hlist[ver]) {
1648 del_timer(&mp->timer);
1649 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1650 }
1651 }
1652
1653 if (mdb->old) {
1654 spin_unlock_bh(&br->multicast_lock);
1655 rcu_barrier_bh();
1656 spin_lock_bh(&br->multicast_lock);
1657 WARN_ON(mdb->old);
1658 }
1659
1660 mdb->old = mdb;
1661 call_rcu_bh(&mdb->rcu, br_mdb_free);
1662
1663 out:
1664 spin_unlock_bh(&br->multicast_lock);
1665 }
1666
1667 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1668 {
1669 int err = -ENOENT;
1670
1671 spin_lock_bh(&br->multicast_lock);
1672 if (!netif_running(br->dev))
1673 goto unlock;
1674
1675 switch (val) {
1676 case 0:
1677 case 2:
1678 del_timer(&br->multicast_router_timer);
1679 /* fall through */
1680 case 1:
1681 br->multicast_router = val;
1682 err = 0;
1683 break;
1684
1685 default:
1686 err = -EINVAL;
1687 break;
1688 }
1689
1690 unlock:
1691 spin_unlock_bh(&br->multicast_lock);
1692
1693 return err;
1694 }
1695
1696 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1697 {
1698 struct net_bridge *br = p->br;
1699 int err = -ENOENT;
1700
1701 spin_lock(&br->multicast_lock);
1702 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1703 goto unlock;
1704
1705 switch (val) {
1706 case 0:
1707 case 1:
1708 case 2:
1709 p->multicast_router = val;
1710 err = 0;
1711
1712 if (val < 2 && !hlist_unhashed(&p->rlist))
1713 hlist_del_init_rcu(&p->rlist);
1714
1715 if (val == 1)
1716 break;
1717
1718 del_timer(&p->multicast_router_timer);
1719
1720 if (val == 0)
1721 break;
1722
1723 br_multicast_add_router(br, p);
1724 break;
1725
1726 default:
1727 err = -EINVAL;
1728 break;
1729 }
1730
1731 unlock:
1732 spin_unlock(&br->multicast_lock);
1733
1734 return err;
1735 }
1736
1737 static void br_multicast_start_querier(struct net_bridge *br)
1738 {
1739 struct net_bridge_port *port;
1740
1741 br_multicast_open(br);
1742
1743 list_for_each_entry(port, &br->port_list, list) {
1744 if (port->state == BR_STATE_DISABLED ||
1745 port->state == BR_STATE_BLOCKING)
1746 continue;
1747
1748 __br_multicast_enable_port(port);
1749 }
1750 }
1751
1752 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1753 {
1754 int err = 0;
1755 struct net_bridge_mdb_htable *mdb;
1756
1757 spin_lock_bh(&br->multicast_lock);
1758 if (br->multicast_disabled == !val)
1759 goto unlock;
1760
1761 br->multicast_disabled = !val;
1762 if (br->multicast_disabled)
1763 goto unlock;
1764
1765 if (!netif_running(br->dev))
1766 goto unlock;
1767
1768 mdb = mlock_dereference(br->mdb, br);
1769 if (mdb) {
1770 if (mdb->old) {
1771 err = -EEXIST;
1772 rollback:
1773 br->multicast_disabled = !!val;
1774 goto unlock;
1775 }
1776
1777 err = br_mdb_rehash(&br->mdb, mdb->max,
1778 br->hash_elasticity);
1779 if (err)
1780 goto rollback;
1781 }
1782
1783 br_multicast_start_querier(br);
1784
1785 unlock:
1786 spin_unlock_bh(&br->multicast_lock);
1787
1788 return err;
1789 }
1790
1791 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1792 {
1793 val = !!val;
1794
1795 spin_lock_bh(&br->multicast_lock);
1796 if (br->multicast_querier == val)
1797 goto unlock;
1798
1799 br->multicast_querier = val;
1800 if (val)
1801 br_multicast_start_querier(br);
1802
1803 unlock:
1804 spin_unlock_bh(&br->multicast_lock);
1805
1806 return 0;
1807 }
1808
1809 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1810 {
1811 int err = -ENOENT;
1812 u32 old;
1813 struct net_bridge_mdb_htable *mdb;
1814
1815 spin_lock(&br->multicast_lock);
1816 if (!netif_running(br->dev))
1817 goto unlock;
1818
1819 err = -EINVAL;
1820 if (!is_power_of_2(val))
1821 goto unlock;
1822
1823 mdb = mlock_dereference(br->mdb, br);
1824 if (mdb && val < mdb->size)
1825 goto unlock;
1826
1827 err = 0;
1828
1829 old = br->hash_max;
1830 br->hash_max = val;
1831
1832 if (mdb) {
1833 if (mdb->old) {
1834 err = -EEXIST;
1835 rollback:
1836 br->hash_max = old;
1837 goto unlock;
1838 }
1839
1840 err = br_mdb_rehash(&br->mdb, br->hash_max,
1841 br->hash_elasticity);
1842 if (err)
1843 goto rollback;
1844 }
1845
1846 unlock:
1847 spin_unlock(&br->multicast_lock);
1848
1849 return err;
1850 }
Linux kernel - Deliverables
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