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Merge tag 'sound-fix-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[mirror_ubuntu-bionic-kernel.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 <linux/inetdevice.h>
27 #include <net/ip.h>
28 #if IS_ENABLED(CONFIG_IPV6)
29 #include <net/ipv6.h>
30 #include <net/mld.h>
31 #include <net/ip6_checksum.h>
32 #include <net/addrconf.h>
33 #endif
34
35 #include "br_private.h"
36
37 static void br_multicast_start_querier(struct net_bridge *br,
38 struct bridge_mcast_query *query);
39 unsigned int br_mdb_rehash_seq;
40
41 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
42 {
43 if (a->proto != b->proto)
44 return 0;
45 if (a->vid != b->vid)
46 return 0;
47 switch (a->proto) {
48 case htons(ETH_P_IP):
49 return a->u.ip4 == b->u.ip4;
50 #if IS_ENABLED(CONFIG_IPV6)
51 case htons(ETH_P_IPV6):
52 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
53 #endif
54 }
55 return 0;
56 }
57
58 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
59 __u16 vid)
60 {
61 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
62 }
63
64 #if IS_ENABLED(CONFIG_IPV6)
65 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
66 const struct in6_addr *ip,
67 __u16 vid)
68 {
69 return jhash_2words(ipv6_addr_hash(ip), vid,
70 mdb->secret) & (mdb->max - 1);
71 }
72 #endif
73
74 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
75 struct br_ip *ip)
76 {
77 switch (ip->proto) {
78 case htons(ETH_P_IP):
79 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
80 #if IS_ENABLED(CONFIG_IPV6)
81 case htons(ETH_P_IPV6):
82 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
83 #endif
84 }
85 return 0;
86 }
87
88 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
89 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
90 {
91 struct net_bridge_mdb_entry *mp;
92
93 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
94 if (br_ip_equal(&mp->addr, dst))
95 return mp;
96 }
97
98 return NULL;
99 }
100
101 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
102 struct br_ip *dst)
103 {
104 if (!mdb)
105 return NULL;
106
107 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
108 }
109
110 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
111 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
112 {
113 struct br_ip br_dst;
114
115 br_dst.u.ip4 = dst;
116 br_dst.proto = htons(ETH_P_IP);
117 br_dst.vid = vid;
118
119 return br_mdb_ip_get(mdb, &br_dst);
120 }
121
122 #if IS_ENABLED(CONFIG_IPV6)
123 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
124 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
125 __u16 vid)
126 {
127 struct br_ip br_dst;
128
129 br_dst.u.ip6 = *dst;
130 br_dst.proto = htons(ETH_P_IPV6);
131 br_dst.vid = vid;
132
133 return br_mdb_ip_get(mdb, &br_dst);
134 }
135 #endif
136
137 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
138 struct sk_buff *skb, u16 vid)
139 {
140 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
141 struct br_ip ip;
142
143 if (br->multicast_disabled)
144 return NULL;
145
146 if (BR_INPUT_SKB_CB(skb)->igmp)
147 return NULL;
148
149 ip.proto = skb->protocol;
150 ip.vid = vid;
151
152 switch (skb->protocol) {
153 case htons(ETH_P_IP):
154 ip.u.ip4 = ip_hdr(skb)->daddr;
155 break;
156 #if IS_ENABLED(CONFIG_IPV6)
157 case htons(ETH_P_IPV6):
158 ip.u.ip6 = ipv6_hdr(skb)->daddr;
159 break;
160 #endif
161 default:
162 return NULL;
163 }
164
165 return br_mdb_ip_get(mdb, &ip);
166 }
167
168 static void br_mdb_free(struct rcu_head *head)
169 {
170 struct net_bridge_mdb_htable *mdb =
171 container_of(head, struct net_bridge_mdb_htable, rcu);
172 struct net_bridge_mdb_htable *old = mdb->old;
173
174 mdb->old = NULL;
175 kfree(old->mhash);
176 kfree(old);
177 }
178
179 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
180 struct net_bridge_mdb_htable *old,
181 int elasticity)
182 {
183 struct net_bridge_mdb_entry *mp;
184 int maxlen;
185 int len;
186 int i;
187
188 for (i = 0; i < old->max; i++)
189 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
190 hlist_add_head(&mp->hlist[new->ver],
191 &new->mhash[br_ip_hash(new, &mp->addr)]);
192
193 if (!elasticity)
194 return 0;
195
196 maxlen = 0;
197 for (i = 0; i < new->max; i++) {
198 len = 0;
199 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
200 len++;
201 if (len > maxlen)
202 maxlen = len;
203 }
204
205 return maxlen > elasticity ? -EINVAL : 0;
206 }
207
208 void br_multicast_free_pg(struct rcu_head *head)
209 {
210 struct net_bridge_port_group *p =
211 container_of(head, struct net_bridge_port_group, rcu);
212
213 kfree(p);
214 }
215
216 static void br_multicast_free_group(struct rcu_head *head)
217 {
218 struct net_bridge_mdb_entry *mp =
219 container_of(head, struct net_bridge_mdb_entry, rcu);
220
221 kfree(mp);
222 }
223
224 static void br_multicast_group_expired(unsigned long data)
225 {
226 struct net_bridge_mdb_entry *mp = (void *)data;
227 struct net_bridge *br = mp->br;
228 struct net_bridge_mdb_htable *mdb;
229
230 spin_lock(&br->multicast_lock);
231 if (!netif_running(br->dev) || timer_pending(&mp->timer))
232 goto out;
233
234 mp->mglist = false;
235
236 if (mp->ports)
237 goto out;
238
239 mdb = mlock_dereference(br->mdb, br);
240
241 hlist_del_rcu(&mp->hlist[mdb->ver]);
242 mdb->size--;
243
244 call_rcu_bh(&mp->rcu, br_multicast_free_group);
245
246 out:
247 spin_unlock(&br->multicast_lock);
248 }
249
250 static void br_multicast_del_pg(struct net_bridge *br,
251 struct net_bridge_port_group *pg)
252 {
253 struct net_bridge_mdb_htable *mdb;
254 struct net_bridge_mdb_entry *mp;
255 struct net_bridge_port_group *p;
256 struct net_bridge_port_group __rcu **pp;
257
258 mdb = mlock_dereference(br->mdb, br);
259
260 mp = br_mdb_ip_get(mdb, &pg->addr);
261 if (WARN_ON(!mp))
262 return;
263
264 for (pp = &mp->ports;
265 (p = mlock_dereference(*pp, br)) != NULL;
266 pp = &p->next) {
267 if (p != pg)
268 continue;
269
270 rcu_assign_pointer(*pp, p->next);
271 hlist_del_init(&p->mglist);
272 del_timer(&p->timer);
273 call_rcu_bh(&p->rcu, br_multicast_free_pg);
274
275 if (!mp->ports && !mp->mglist &&
276 netif_running(br->dev))
277 mod_timer(&mp->timer, jiffies);
278
279 return;
280 }
281
282 WARN_ON(1);
283 }
284
285 static void br_multicast_port_group_expired(unsigned long data)
286 {
287 struct net_bridge_port_group *pg = (void *)data;
288 struct net_bridge *br = pg->port->br;
289
290 spin_lock(&br->multicast_lock);
291 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
292 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
293 goto out;
294
295 br_multicast_del_pg(br, pg);
296
297 out:
298 spin_unlock(&br->multicast_lock);
299 }
300
301 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
302 int elasticity)
303 {
304 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
305 struct net_bridge_mdb_htable *mdb;
306 int err;
307
308 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
309 if (!mdb)
310 return -ENOMEM;
311
312 mdb->max = max;
313 mdb->old = old;
314
315 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
316 if (!mdb->mhash) {
317 kfree(mdb);
318 return -ENOMEM;
319 }
320
321 mdb->size = old ? old->size : 0;
322 mdb->ver = old ? old->ver ^ 1 : 0;
323
324 if (!old || elasticity)
325 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
326 else
327 mdb->secret = old->secret;
328
329 if (!old)
330 goto out;
331
332 err = br_mdb_copy(mdb, old, elasticity);
333 if (err) {
334 kfree(mdb->mhash);
335 kfree(mdb);
336 return err;
337 }
338
339 br_mdb_rehash_seq++;
340 call_rcu_bh(&mdb->rcu, br_mdb_free);
341
342 out:
343 rcu_assign_pointer(*mdbp, mdb);
344
345 return 0;
346 }
347
348 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
349 __be32 group)
350 {
351 struct sk_buff *skb;
352 struct igmphdr *ih;
353 struct ethhdr *eth;
354 struct iphdr *iph;
355
356 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
357 sizeof(*ih) + 4);
358 if (!skb)
359 goto out;
360
361 skb->protocol = htons(ETH_P_IP);
362
363 skb_reset_mac_header(skb);
364 eth = eth_hdr(skb);
365
366 ether_addr_copy(eth->h_source, br->dev->dev_addr);
367 eth->h_dest[0] = 1;
368 eth->h_dest[1] = 0;
369 eth->h_dest[2] = 0x5e;
370 eth->h_dest[3] = 0;
371 eth->h_dest[4] = 0;
372 eth->h_dest[5] = 1;
373 eth->h_proto = htons(ETH_P_IP);
374 skb_put(skb, sizeof(*eth));
375
376 skb_set_network_header(skb, skb->len);
377 iph = ip_hdr(skb);
378
379 iph->version = 4;
380 iph->ihl = 6;
381 iph->tos = 0xc0;
382 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
383 iph->id = 0;
384 iph->frag_off = htons(IP_DF);
385 iph->ttl = 1;
386 iph->protocol = IPPROTO_IGMP;
387 iph->saddr = br->multicast_query_use_ifaddr ?
388 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
389 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
390 ((u8 *)&iph[1])[0] = IPOPT_RA;
391 ((u8 *)&iph[1])[1] = 4;
392 ((u8 *)&iph[1])[2] = 0;
393 ((u8 *)&iph[1])[3] = 0;
394 ip_send_check(iph);
395 skb_put(skb, 24);
396
397 skb_set_transport_header(skb, skb->len);
398 ih = igmp_hdr(skb);
399 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
400 ih->code = (group ? br->multicast_last_member_interval :
401 br->multicast_query_response_interval) /
402 (HZ / IGMP_TIMER_SCALE);
403 ih->group = group;
404 ih->csum = 0;
405 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
406 skb_put(skb, sizeof(*ih));
407
408 __skb_pull(skb, sizeof(*eth));
409
410 out:
411 return skb;
412 }
413
414 #if IS_ENABLED(CONFIG_IPV6)
415 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
416 const struct in6_addr *group)
417 {
418 struct sk_buff *skb;
419 struct ipv6hdr *ip6h;
420 struct mld_msg *mldq;
421 struct ethhdr *eth;
422 u8 *hopopt;
423 unsigned long interval;
424
425 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
426 8 + sizeof(*mldq));
427 if (!skb)
428 goto out;
429
430 skb->protocol = htons(ETH_P_IPV6);
431
432 /* Ethernet header */
433 skb_reset_mac_header(skb);
434 eth = eth_hdr(skb);
435
436 ether_addr_copy(eth->h_source, br->dev->dev_addr);
437 eth->h_proto = htons(ETH_P_IPV6);
438 skb_put(skb, sizeof(*eth));
439
440 /* IPv6 header + HbH option */
441 skb_set_network_header(skb, skb->len);
442 ip6h = ipv6_hdr(skb);
443
444 *(__force __be32 *)ip6h = htonl(0x60000000);
445 ip6h->payload_len = htons(8 + sizeof(*mldq));
446 ip6h->nexthdr = IPPROTO_HOPOPTS;
447 ip6h->hop_limit = 1;
448 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
449 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
450 &ip6h->saddr)) {
451 kfree_skb(skb);
452 return NULL;
453 }
454 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
455
456 hopopt = (u8 *)(ip6h + 1);
457 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
458 hopopt[1] = 0; /* length of HbH */
459 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
460 hopopt[3] = 2; /* Length of RA Option */
461 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
462 hopopt[5] = 0;
463 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
464 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
465
466 skb_put(skb, sizeof(*ip6h) + 8);
467
468 /* ICMPv6 */
469 skb_set_transport_header(skb, skb->len);
470 mldq = (struct mld_msg *) icmp6_hdr(skb);
471
472 interval = ipv6_addr_any(group) ?
473 br->multicast_query_response_interval :
474 br->multicast_last_member_interval;
475
476 mldq->mld_type = ICMPV6_MGM_QUERY;
477 mldq->mld_code = 0;
478 mldq->mld_cksum = 0;
479 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
480 mldq->mld_reserved = 0;
481 mldq->mld_mca = *group;
482
483 /* checksum */
484 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
485 sizeof(*mldq), IPPROTO_ICMPV6,
486 csum_partial(mldq,
487 sizeof(*mldq), 0));
488 skb_put(skb, sizeof(*mldq));
489
490 __skb_pull(skb, sizeof(*eth));
491
492 out:
493 return skb;
494 }
495 #endif
496
497 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
498 struct br_ip *addr)
499 {
500 switch (addr->proto) {
501 case htons(ETH_P_IP):
502 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
503 #if IS_ENABLED(CONFIG_IPV6)
504 case htons(ETH_P_IPV6):
505 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
506 #endif
507 }
508 return NULL;
509 }
510
511 static struct net_bridge_mdb_entry *br_multicast_get_group(
512 struct net_bridge *br, struct net_bridge_port *port,
513 struct br_ip *group, int hash)
514 {
515 struct net_bridge_mdb_htable *mdb;
516 struct net_bridge_mdb_entry *mp;
517 unsigned int count = 0;
518 unsigned int max;
519 int elasticity;
520 int err;
521
522 mdb = rcu_dereference_protected(br->mdb, 1);
523 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
524 count++;
525 if (unlikely(br_ip_equal(group, &mp->addr)))
526 return mp;
527 }
528
529 elasticity = 0;
530 max = mdb->max;
531
532 if (unlikely(count > br->hash_elasticity && count)) {
533 if (net_ratelimit())
534 br_info(br, "Multicast hash table "
535 "chain limit reached: %s\n",
536 port ? port->dev->name : br->dev->name);
537
538 elasticity = br->hash_elasticity;
539 }
540
541 if (mdb->size >= max) {
542 max *= 2;
543 if (unlikely(max > br->hash_max)) {
544 br_warn(br, "Multicast hash table maximum of %d "
545 "reached, disabling snooping: %s\n",
546 br->hash_max,
547 port ? port->dev->name : br->dev->name);
548 err = -E2BIG;
549 disable:
550 br->multicast_disabled = 1;
551 goto err;
552 }
553 }
554
555 if (max > mdb->max || elasticity) {
556 if (mdb->old) {
557 if (net_ratelimit())
558 br_info(br, "Multicast hash table "
559 "on fire: %s\n",
560 port ? port->dev->name : br->dev->name);
561 err = -EEXIST;
562 goto err;
563 }
564
565 err = br_mdb_rehash(&br->mdb, max, elasticity);
566 if (err) {
567 br_warn(br, "Cannot rehash multicast "
568 "hash table, disabling snooping: %s, %d, %d\n",
569 port ? port->dev->name : br->dev->name,
570 mdb->size, err);
571 goto disable;
572 }
573
574 err = -EAGAIN;
575 goto err;
576 }
577
578 return NULL;
579
580 err:
581 mp = ERR_PTR(err);
582 return mp;
583 }
584
585 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
586 struct net_bridge_port *port, struct br_ip *group)
587 {
588 struct net_bridge_mdb_htable *mdb;
589 struct net_bridge_mdb_entry *mp;
590 int hash;
591 int err;
592
593 mdb = rcu_dereference_protected(br->mdb, 1);
594 if (!mdb) {
595 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
596 if (err)
597 return ERR_PTR(err);
598 goto rehash;
599 }
600
601 hash = br_ip_hash(mdb, group);
602 mp = br_multicast_get_group(br, port, group, hash);
603 switch (PTR_ERR(mp)) {
604 case 0:
605 break;
606
607 case -EAGAIN:
608 rehash:
609 mdb = rcu_dereference_protected(br->mdb, 1);
610 hash = br_ip_hash(mdb, group);
611 break;
612
613 default:
614 goto out;
615 }
616
617 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
618 if (unlikely(!mp))
619 return ERR_PTR(-ENOMEM);
620
621 mp->br = br;
622 mp->addr = *group;
623 setup_timer(&mp->timer, br_multicast_group_expired,
624 (unsigned long)mp);
625
626 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
627 mdb->size++;
628
629 out:
630 return mp;
631 }
632
633 struct net_bridge_port_group *br_multicast_new_port_group(
634 struct net_bridge_port *port,
635 struct br_ip *group,
636 struct net_bridge_port_group __rcu *next,
637 unsigned char state)
638 {
639 struct net_bridge_port_group *p;
640
641 p = kzalloc(sizeof(*p), GFP_ATOMIC);
642 if (unlikely(!p))
643 return NULL;
644
645 p->addr = *group;
646 p->port = port;
647 p->state = state;
648 rcu_assign_pointer(p->next, next);
649 hlist_add_head(&p->mglist, &port->mglist);
650 setup_timer(&p->timer, br_multicast_port_group_expired,
651 (unsigned long)p);
652 return p;
653 }
654
655 static int br_multicast_add_group(struct net_bridge *br,
656 struct net_bridge_port *port,
657 struct br_ip *group)
658 {
659 struct net_bridge_mdb_entry *mp;
660 struct net_bridge_port_group *p;
661 struct net_bridge_port_group __rcu **pp;
662 unsigned long now = jiffies;
663 int err;
664
665 spin_lock(&br->multicast_lock);
666 if (!netif_running(br->dev) ||
667 (port && port->state == BR_STATE_DISABLED))
668 goto out;
669
670 mp = br_multicast_new_group(br, port, group);
671 err = PTR_ERR(mp);
672 if (IS_ERR(mp))
673 goto err;
674
675 if (!port) {
676 mp->mglist = true;
677 mod_timer(&mp->timer, now + br->multicast_membership_interval);
678 goto out;
679 }
680
681 for (pp = &mp->ports;
682 (p = mlock_dereference(*pp, br)) != NULL;
683 pp = &p->next) {
684 if (p->port == port)
685 goto found;
686 if ((unsigned long)p->port < (unsigned long)port)
687 break;
688 }
689
690 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
691 if (unlikely(!p))
692 goto err;
693 rcu_assign_pointer(*pp, p);
694 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
695
696 found:
697 mod_timer(&p->timer, now + br->multicast_membership_interval);
698 out:
699 err = 0;
700
701 err:
702 spin_unlock(&br->multicast_lock);
703 return err;
704 }
705
706 static int br_ip4_multicast_add_group(struct net_bridge *br,
707 struct net_bridge_port *port,
708 __be32 group,
709 __u16 vid)
710 {
711 struct br_ip br_group;
712
713 if (ipv4_is_local_multicast(group))
714 return 0;
715
716 br_group.u.ip4 = group;
717 br_group.proto = htons(ETH_P_IP);
718 br_group.vid = vid;
719
720 return br_multicast_add_group(br, port, &br_group);
721 }
722
723 #if IS_ENABLED(CONFIG_IPV6)
724 static int br_ip6_multicast_add_group(struct net_bridge *br,
725 struct net_bridge_port *port,
726 const struct in6_addr *group,
727 __u16 vid)
728 {
729 struct br_ip br_group;
730
731 if (ipv6_addr_is_ll_all_nodes(group))
732 return 0;
733
734 br_group.u.ip6 = *group;
735 br_group.proto = htons(ETH_P_IPV6);
736 br_group.vid = vid;
737
738 return br_multicast_add_group(br, port, &br_group);
739 }
740 #endif
741
742 static void br_multicast_router_expired(unsigned long data)
743 {
744 struct net_bridge_port *port = (void *)data;
745 struct net_bridge *br = port->br;
746
747 spin_lock(&br->multicast_lock);
748 if (port->multicast_router != 1 ||
749 timer_pending(&port->multicast_router_timer) ||
750 hlist_unhashed(&port->rlist))
751 goto out;
752
753 hlist_del_init_rcu(&port->rlist);
754
755 out:
756 spin_unlock(&br->multicast_lock);
757 }
758
759 static void br_multicast_local_router_expired(unsigned long data)
760 {
761 }
762
763 static void br_multicast_querier_expired(struct net_bridge *br,
764 struct bridge_mcast_query *query)
765 {
766 spin_lock(&br->multicast_lock);
767 if (!netif_running(br->dev) || br->multicast_disabled)
768 goto out;
769
770 br_multicast_start_querier(br, query);
771
772 out:
773 spin_unlock(&br->multicast_lock);
774 }
775
776 static void br_ip4_multicast_querier_expired(unsigned long data)
777 {
778 struct net_bridge *br = (void *)data;
779
780 br_multicast_querier_expired(br, &br->ip4_query);
781 }
782
783 #if IS_ENABLED(CONFIG_IPV6)
784 static void br_ip6_multicast_querier_expired(unsigned long data)
785 {
786 struct net_bridge *br = (void *)data;
787
788 br_multicast_querier_expired(br, &br->ip6_query);
789 }
790 #endif
791
792 static void __br_multicast_send_query(struct net_bridge *br,
793 struct net_bridge_port *port,
794 struct br_ip *ip)
795 {
796 struct sk_buff *skb;
797
798 skb = br_multicast_alloc_query(br, ip);
799 if (!skb)
800 return;
801
802 if (port) {
803 __skb_push(skb, sizeof(struct ethhdr));
804 skb->dev = port->dev;
805 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
806 dev_queue_xmit);
807 } else
808 netif_rx(skb);
809 }
810
811 static void br_multicast_send_query(struct net_bridge *br,
812 struct net_bridge_port *port,
813 struct bridge_mcast_query *query)
814 {
815 unsigned long time;
816 struct br_ip br_group;
817 struct bridge_mcast_querier *querier = NULL;
818
819 if (!netif_running(br->dev) || br->multicast_disabled ||
820 !br->multicast_querier)
821 return;
822
823 memset(&br_group.u, 0, sizeof(br_group.u));
824
825 if (port ? (query == &port->ip4_query) :
826 (query == &br->ip4_query)) {
827 querier = &br->ip4_querier;
828 br_group.proto = htons(ETH_P_IP);
829 #if IS_ENABLED(CONFIG_IPV6)
830 } else {
831 querier = &br->ip6_querier;
832 br_group.proto = htons(ETH_P_IPV6);
833 #endif
834 }
835
836 if (!querier || timer_pending(&querier->timer))
837 return;
838
839 __br_multicast_send_query(br, port, &br_group);
840
841 time = jiffies;
842 time += query->startup_sent < br->multicast_startup_query_count ?
843 br->multicast_startup_query_interval :
844 br->multicast_query_interval;
845 mod_timer(&query->timer, time);
846 }
847
848 static void br_multicast_port_query_expired(struct net_bridge_port *port,
849 struct bridge_mcast_query *query)
850 {
851 struct net_bridge *br = port->br;
852
853 spin_lock(&br->multicast_lock);
854 if (port->state == BR_STATE_DISABLED ||
855 port->state == BR_STATE_BLOCKING)
856 goto out;
857
858 if (query->startup_sent < br->multicast_startup_query_count)
859 query->startup_sent++;
860
861 br_multicast_send_query(port->br, port, query);
862
863 out:
864 spin_unlock(&br->multicast_lock);
865 }
866
867 static void br_ip4_multicast_port_query_expired(unsigned long data)
868 {
869 struct net_bridge_port *port = (void *)data;
870
871 br_multicast_port_query_expired(port, &port->ip4_query);
872 }
873
874 #if IS_ENABLED(CONFIG_IPV6)
875 static void br_ip6_multicast_port_query_expired(unsigned long data)
876 {
877 struct net_bridge_port *port = (void *)data;
878
879 br_multicast_port_query_expired(port, &port->ip6_query);
880 }
881 #endif
882
883 void br_multicast_add_port(struct net_bridge_port *port)
884 {
885 port->multicast_router = 1;
886
887 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
888 (unsigned long)port);
889 setup_timer(&port->ip4_query.timer, br_ip4_multicast_port_query_expired,
890 (unsigned long)port);
891 #if IS_ENABLED(CONFIG_IPV6)
892 setup_timer(&port->ip6_query.timer, br_ip6_multicast_port_query_expired,
893 (unsigned long)port);
894 #endif
895 }
896
897 void br_multicast_del_port(struct net_bridge_port *port)
898 {
899 del_timer_sync(&port->multicast_router_timer);
900 }
901
902 static void br_multicast_enable(struct bridge_mcast_query *query)
903 {
904 query->startup_sent = 0;
905
906 if (try_to_del_timer_sync(&query->timer) >= 0 ||
907 del_timer(&query->timer))
908 mod_timer(&query->timer, jiffies);
909 }
910
911 void br_multicast_enable_port(struct net_bridge_port *port)
912 {
913 struct net_bridge *br = port->br;
914
915 spin_lock(&br->multicast_lock);
916 if (br->multicast_disabled || !netif_running(br->dev))
917 goto out;
918
919 br_multicast_enable(&port->ip4_query);
920 #if IS_ENABLED(CONFIG_IPV6)
921 br_multicast_enable(&port->ip6_query);
922 #endif
923
924 out:
925 spin_unlock(&br->multicast_lock);
926 }
927
928 void br_multicast_disable_port(struct net_bridge_port *port)
929 {
930 struct net_bridge *br = port->br;
931 struct net_bridge_port_group *pg;
932 struct hlist_node *n;
933
934 spin_lock(&br->multicast_lock);
935 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
936 br_multicast_del_pg(br, pg);
937
938 if (!hlist_unhashed(&port->rlist))
939 hlist_del_init_rcu(&port->rlist);
940 del_timer(&port->multicast_router_timer);
941 del_timer(&port->ip4_query.timer);
942 #if IS_ENABLED(CONFIG_IPV6)
943 del_timer(&port->ip6_query.timer);
944 #endif
945 spin_unlock(&br->multicast_lock);
946 }
947
948 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
949 struct net_bridge_port *port,
950 struct sk_buff *skb,
951 u16 vid)
952 {
953 struct igmpv3_report *ih;
954 struct igmpv3_grec *grec;
955 int i;
956 int len;
957 int num;
958 int type;
959 int err = 0;
960 __be32 group;
961
962 if (!pskb_may_pull(skb, sizeof(*ih)))
963 return -EINVAL;
964
965 ih = igmpv3_report_hdr(skb);
966 num = ntohs(ih->ngrec);
967 len = sizeof(*ih);
968
969 for (i = 0; i < num; i++) {
970 len += sizeof(*grec);
971 if (!pskb_may_pull(skb, len))
972 return -EINVAL;
973
974 grec = (void *)(skb->data + len - sizeof(*grec));
975 group = grec->grec_mca;
976 type = grec->grec_type;
977
978 len += ntohs(grec->grec_nsrcs) * 4;
979 if (!pskb_may_pull(skb, len))
980 return -EINVAL;
981
982 /* We treat this as an IGMPv2 report for now. */
983 switch (type) {
984 case IGMPV3_MODE_IS_INCLUDE:
985 case IGMPV3_MODE_IS_EXCLUDE:
986 case IGMPV3_CHANGE_TO_INCLUDE:
987 case IGMPV3_CHANGE_TO_EXCLUDE:
988 case IGMPV3_ALLOW_NEW_SOURCES:
989 case IGMPV3_BLOCK_OLD_SOURCES:
990 break;
991
992 default:
993 continue;
994 }
995
996 err = br_ip4_multicast_add_group(br, port, group, vid);
997 if (err)
998 break;
999 }
1000
1001 return err;
1002 }
1003
1004 #if IS_ENABLED(CONFIG_IPV6)
1005 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1006 struct net_bridge_port *port,
1007 struct sk_buff *skb,
1008 u16 vid)
1009 {
1010 struct icmp6hdr *icmp6h;
1011 struct mld2_grec *grec;
1012 int i;
1013 int len;
1014 int num;
1015 int err = 0;
1016
1017 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1018 return -EINVAL;
1019
1020 icmp6h = icmp6_hdr(skb);
1021 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1022 len = sizeof(*icmp6h);
1023
1024 for (i = 0; i < num; i++) {
1025 __be16 *nsrcs, _nsrcs;
1026
1027 nsrcs = skb_header_pointer(skb,
1028 len + offsetof(struct mld2_grec,
1029 grec_nsrcs),
1030 sizeof(_nsrcs), &_nsrcs);
1031 if (!nsrcs)
1032 return -EINVAL;
1033
1034 if (!pskb_may_pull(skb,
1035 len + sizeof(*grec) +
1036 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1037 return -EINVAL;
1038
1039 grec = (struct mld2_grec *)(skb->data + len);
1040 len += sizeof(*grec) +
1041 sizeof(struct in6_addr) * ntohs(*nsrcs);
1042
1043 /* We treat these as MLDv1 reports for now. */
1044 switch (grec->grec_type) {
1045 case MLD2_MODE_IS_INCLUDE:
1046 case MLD2_MODE_IS_EXCLUDE:
1047 case MLD2_CHANGE_TO_INCLUDE:
1048 case MLD2_CHANGE_TO_EXCLUDE:
1049 case MLD2_ALLOW_NEW_SOURCES:
1050 case MLD2_BLOCK_OLD_SOURCES:
1051 break;
1052
1053 default:
1054 continue;
1055 }
1056
1057 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1058 vid);
1059 if (!err)
1060 break;
1061 }
1062
1063 return err;
1064 }
1065 #endif
1066
1067 static void
1068 br_multicast_update_querier_timer(struct net_bridge *br,
1069 struct bridge_mcast_querier *querier,
1070 unsigned long max_delay)
1071 {
1072 if (!timer_pending(&querier->timer))
1073 querier->delay_time = jiffies + max_delay;
1074
1075 mod_timer(&querier->timer, jiffies + br->multicast_querier_interval);
1076 }
1077
1078 /*
1079 * Add port to router_list
1080 * list is maintained ordered by pointer value
1081 * and locked by br->multicast_lock and RCU
1082 */
1083 static void br_multicast_add_router(struct net_bridge *br,
1084 struct net_bridge_port *port)
1085 {
1086 struct net_bridge_port *p;
1087 struct hlist_node *slot = NULL;
1088
1089 hlist_for_each_entry(p, &br->router_list, rlist) {
1090 if ((unsigned long) port >= (unsigned long) p)
1091 break;
1092 slot = &p->rlist;
1093 }
1094
1095 if (slot)
1096 hlist_add_after_rcu(slot, &port->rlist);
1097 else
1098 hlist_add_head_rcu(&port->rlist, &br->router_list);
1099 }
1100
1101 static void br_multicast_mark_router(struct net_bridge *br,
1102 struct net_bridge_port *port)
1103 {
1104 unsigned long now = jiffies;
1105
1106 if (!port) {
1107 if (br->multicast_router == 1)
1108 mod_timer(&br->multicast_router_timer,
1109 now + br->multicast_querier_interval);
1110 return;
1111 }
1112
1113 if (port->multicast_router != 1)
1114 return;
1115
1116 if (!hlist_unhashed(&port->rlist))
1117 goto timer;
1118
1119 br_multicast_add_router(br, port);
1120
1121 timer:
1122 mod_timer(&port->multicast_router_timer,
1123 now + br->multicast_querier_interval);
1124 }
1125
1126 static void br_multicast_query_received(struct net_bridge *br,
1127 struct net_bridge_port *port,
1128 struct bridge_mcast_querier *querier,
1129 int saddr,
1130 bool is_general_query,
1131 unsigned long max_delay)
1132 {
1133 if (saddr && is_general_query)
1134 br_multicast_update_querier_timer(br, querier, max_delay);
1135 else if (timer_pending(&querier->timer))
1136 return;
1137
1138 br_multicast_mark_router(br, port);
1139 }
1140
1141 static int br_ip4_multicast_query(struct net_bridge *br,
1142 struct net_bridge_port *port,
1143 struct sk_buff *skb,
1144 u16 vid)
1145 {
1146 const struct iphdr *iph = ip_hdr(skb);
1147 struct igmphdr *ih = igmp_hdr(skb);
1148 struct net_bridge_mdb_entry *mp;
1149 struct igmpv3_query *ih3;
1150 struct net_bridge_port_group *p;
1151 struct net_bridge_port_group __rcu **pp;
1152 unsigned long max_delay;
1153 unsigned long now = jiffies;
1154 __be32 group;
1155 int err = 0;
1156
1157 spin_lock(&br->multicast_lock);
1158 if (!netif_running(br->dev) ||
1159 (port && port->state == BR_STATE_DISABLED))
1160 goto out;
1161
1162 group = ih->group;
1163
1164 if (skb->len == sizeof(*ih)) {
1165 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1166
1167 if (!max_delay) {
1168 max_delay = 10 * HZ;
1169 group = 0;
1170 }
1171 } else {
1172 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1173 err = -EINVAL;
1174 goto out;
1175 }
1176
1177 ih3 = igmpv3_query_hdr(skb);
1178 if (ih3->nsrcs)
1179 goto out;
1180
1181 max_delay = ih3->code ?
1182 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1183 }
1184
1185 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1186 * all-systems destination addresses (224.0.0.1) for general queries
1187 */
1188 if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) {
1189 err = -EINVAL;
1190 goto out;
1191 }
1192
1193 br_multicast_query_received(br, port, &br->ip4_querier, !!iph->saddr,
1194 !group, max_delay);
1195
1196 if (!group)
1197 goto out;
1198
1199 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1200 if (!mp)
1201 goto out;
1202
1203 max_delay *= br->multicast_last_member_count;
1204
1205 if (mp->mglist &&
1206 (timer_pending(&mp->timer) ?
1207 time_after(mp->timer.expires, now + max_delay) :
1208 try_to_del_timer_sync(&mp->timer) >= 0))
1209 mod_timer(&mp->timer, now + max_delay);
1210
1211 for (pp = &mp->ports;
1212 (p = mlock_dereference(*pp, br)) != NULL;
1213 pp = &p->next) {
1214 if (timer_pending(&p->timer) ?
1215 time_after(p->timer.expires, now + max_delay) :
1216 try_to_del_timer_sync(&p->timer) >= 0)
1217 mod_timer(&p->timer, now + max_delay);
1218 }
1219
1220 out:
1221 spin_unlock(&br->multicast_lock);
1222 return err;
1223 }
1224
1225 #if IS_ENABLED(CONFIG_IPV6)
1226 static int br_ip6_multicast_query(struct net_bridge *br,
1227 struct net_bridge_port *port,
1228 struct sk_buff *skb,
1229 u16 vid)
1230 {
1231 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1232 struct mld_msg *mld;
1233 struct net_bridge_mdb_entry *mp;
1234 struct mld2_query *mld2q;
1235 struct net_bridge_port_group *p;
1236 struct net_bridge_port_group __rcu **pp;
1237 unsigned long max_delay;
1238 unsigned long now = jiffies;
1239 const struct in6_addr *group = NULL;
1240 bool is_general_query;
1241 int err = 0;
1242
1243 spin_lock(&br->multicast_lock);
1244 if (!netif_running(br->dev) ||
1245 (port && port->state == BR_STATE_DISABLED))
1246 goto out;
1247
1248 /* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
1249 if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1250 err = -EINVAL;
1251 goto out;
1252 }
1253
1254 if (skb->len == sizeof(*mld)) {
1255 if (!pskb_may_pull(skb, sizeof(*mld))) {
1256 err = -EINVAL;
1257 goto out;
1258 }
1259 mld = (struct mld_msg *) icmp6_hdr(skb);
1260 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1261 if (max_delay)
1262 group = &mld->mld_mca;
1263 } else {
1264 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1265 err = -EINVAL;
1266 goto out;
1267 }
1268 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1269 if (!mld2q->mld2q_nsrcs)
1270 group = &mld2q->mld2q_mca;
1271
1272 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1273 }
1274
1275 is_general_query = group && ipv6_addr_any(group);
1276
1277 /* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
1278 * all-nodes destination address (ff02::1) for general queries
1279 */
1280 if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) {
1281 err = -EINVAL;
1282 goto out;
1283 }
1284
1285 br_multicast_query_received(br, port, &br->ip6_querier,
1286 !ipv6_addr_any(&ip6h->saddr),
1287 is_general_query, max_delay);
1288
1289 if (!group)
1290 goto out;
1291
1292 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1293 if (!mp)
1294 goto out;
1295
1296 max_delay *= br->multicast_last_member_count;
1297 if (mp->mglist &&
1298 (timer_pending(&mp->timer) ?
1299 time_after(mp->timer.expires, now + max_delay) :
1300 try_to_del_timer_sync(&mp->timer) >= 0))
1301 mod_timer(&mp->timer, now + max_delay);
1302
1303 for (pp = &mp->ports;
1304 (p = mlock_dereference(*pp, br)) != NULL;
1305 pp = &p->next) {
1306 if (timer_pending(&p->timer) ?
1307 time_after(p->timer.expires, now + max_delay) :
1308 try_to_del_timer_sync(&p->timer) >= 0)
1309 mod_timer(&p->timer, now + max_delay);
1310 }
1311
1312 out:
1313 spin_unlock(&br->multicast_lock);
1314 return err;
1315 }
1316 #endif
1317
1318 static void br_multicast_leave_group(struct net_bridge *br,
1319 struct net_bridge_port *port,
1320 struct br_ip *group,
1321 struct bridge_mcast_querier *querier,
1322 struct bridge_mcast_query *query)
1323 {
1324 struct net_bridge_mdb_htable *mdb;
1325 struct net_bridge_mdb_entry *mp;
1326 struct net_bridge_port_group *p;
1327 unsigned long now;
1328 unsigned long time;
1329
1330 spin_lock(&br->multicast_lock);
1331 if (!netif_running(br->dev) ||
1332 (port && port->state == BR_STATE_DISABLED) ||
1333 timer_pending(&querier->timer))
1334 goto out;
1335
1336 mdb = mlock_dereference(br->mdb, br);
1337 mp = br_mdb_ip_get(mdb, group);
1338 if (!mp)
1339 goto out;
1340
1341 if (br->multicast_querier) {
1342 __br_multicast_send_query(br, port, &mp->addr);
1343
1344 time = jiffies + br->multicast_last_member_count *
1345 br->multicast_last_member_interval;
1346
1347 mod_timer(&query->timer, time);
1348
1349 for (p = mlock_dereference(mp->ports, br);
1350 p != NULL;
1351 p = mlock_dereference(p->next, br)) {
1352 if (p->port != port)
1353 continue;
1354
1355 if (!hlist_unhashed(&p->mglist) &&
1356 (timer_pending(&p->timer) ?
1357 time_after(p->timer.expires, time) :
1358 try_to_del_timer_sync(&p->timer) >= 0)) {
1359 mod_timer(&p->timer, time);
1360 }
1361
1362 break;
1363 }
1364 }
1365
1366 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1367 struct net_bridge_port_group __rcu **pp;
1368
1369 for (pp = &mp->ports;
1370 (p = mlock_dereference(*pp, br)) != NULL;
1371 pp = &p->next) {
1372 if (p->port != port)
1373 continue;
1374
1375 rcu_assign_pointer(*pp, p->next);
1376 hlist_del_init(&p->mglist);
1377 del_timer(&p->timer);
1378 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1379 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1380
1381 if (!mp->ports && !mp->mglist &&
1382 netif_running(br->dev))
1383 mod_timer(&mp->timer, jiffies);
1384 }
1385 goto out;
1386 }
1387
1388 now = jiffies;
1389 time = now + br->multicast_last_member_count *
1390 br->multicast_last_member_interval;
1391
1392 if (!port) {
1393 if (mp->mglist &&
1394 (timer_pending(&mp->timer) ?
1395 time_after(mp->timer.expires, time) :
1396 try_to_del_timer_sync(&mp->timer) >= 0)) {
1397 mod_timer(&mp->timer, time);
1398 }
1399
1400 goto out;
1401 }
1402
1403 for (p = mlock_dereference(mp->ports, br);
1404 p != NULL;
1405 p = mlock_dereference(p->next, br)) {
1406 if (p->port != port)
1407 continue;
1408
1409 if (!hlist_unhashed(&p->mglist) &&
1410 (timer_pending(&p->timer) ?
1411 time_after(p->timer.expires, time) :
1412 try_to_del_timer_sync(&p->timer) >= 0)) {
1413 mod_timer(&p->timer, time);
1414 }
1415
1416 break;
1417 }
1418 out:
1419 spin_unlock(&br->multicast_lock);
1420 }
1421
1422 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1423 struct net_bridge_port *port,
1424 __be32 group,
1425 __u16 vid)
1426 {
1427 struct br_ip br_group;
1428 struct bridge_mcast_query *query = port ? &port->ip4_query :
1429 &br->ip4_query;
1430
1431 if (ipv4_is_local_multicast(group))
1432 return;
1433
1434 br_group.u.ip4 = group;
1435 br_group.proto = htons(ETH_P_IP);
1436 br_group.vid = vid;
1437
1438 br_multicast_leave_group(br, port, &br_group, &br->ip4_querier, query);
1439 }
1440
1441 #if IS_ENABLED(CONFIG_IPV6)
1442 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1443 struct net_bridge_port *port,
1444 const struct in6_addr *group,
1445 __u16 vid)
1446 {
1447 struct br_ip br_group;
1448 struct bridge_mcast_query *query = port ? &port->ip6_query :
1449 &br->ip6_query;
1450
1451
1452 if (ipv6_addr_is_ll_all_nodes(group))
1453 return;
1454
1455 br_group.u.ip6 = *group;
1456 br_group.proto = htons(ETH_P_IPV6);
1457 br_group.vid = vid;
1458
1459 br_multicast_leave_group(br, port, &br_group, &br->ip6_querier, query);
1460 }
1461 #endif
1462
1463 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1464 struct net_bridge_port *port,
1465 struct sk_buff *skb,
1466 u16 vid)
1467 {
1468 struct sk_buff *skb2 = skb;
1469 const struct iphdr *iph;
1470 struct igmphdr *ih;
1471 unsigned int len;
1472 unsigned int offset;
1473 int err;
1474
1475 /* We treat OOM as packet loss for now. */
1476 if (!pskb_may_pull(skb, sizeof(*iph)))
1477 return -EINVAL;
1478
1479 iph = ip_hdr(skb);
1480
1481 if (iph->ihl < 5 || iph->version != 4)
1482 return -EINVAL;
1483
1484 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1485 return -EINVAL;
1486
1487 iph = ip_hdr(skb);
1488
1489 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1490 return -EINVAL;
1491
1492 if (iph->protocol != IPPROTO_IGMP) {
1493 if (!ipv4_is_local_multicast(iph->daddr))
1494 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1495 return 0;
1496 }
1497
1498 len = ntohs(iph->tot_len);
1499 if (skb->len < len || len < ip_hdrlen(skb))
1500 return -EINVAL;
1501
1502 if (skb->len > len) {
1503 skb2 = skb_clone(skb, GFP_ATOMIC);
1504 if (!skb2)
1505 return -ENOMEM;
1506
1507 err = pskb_trim_rcsum(skb2, len);
1508 if (err)
1509 goto err_out;
1510 }
1511
1512 len -= ip_hdrlen(skb2);
1513 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1514 __skb_pull(skb2, offset);
1515 skb_reset_transport_header(skb2);
1516
1517 err = -EINVAL;
1518 if (!pskb_may_pull(skb2, sizeof(*ih)))
1519 goto out;
1520
1521 switch (skb2->ip_summed) {
1522 case CHECKSUM_COMPLETE:
1523 if (!csum_fold(skb2->csum))
1524 break;
1525 /* fall through */
1526 case CHECKSUM_NONE:
1527 skb2->csum = 0;
1528 if (skb_checksum_complete(skb2))
1529 goto out;
1530 }
1531
1532 err = 0;
1533
1534 BR_INPUT_SKB_CB(skb)->igmp = 1;
1535 ih = igmp_hdr(skb2);
1536
1537 switch (ih->type) {
1538 case IGMP_HOST_MEMBERSHIP_REPORT:
1539 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1540 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1541 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1542 break;
1543 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1544 err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
1545 break;
1546 case IGMP_HOST_MEMBERSHIP_QUERY:
1547 err = br_ip4_multicast_query(br, port, skb2, vid);
1548 break;
1549 case IGMP_HOST_LEAVE_MESSAGE:
1550 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1551 break;
1552 }
1553
1554 out:
1555 __skb_push(skb2, offset);
1556 err_out:
1557 if (skb2 != skb)
1558 kfree_skb(skb2);
1559 return err;
1560 }
1561
1562 #if IS_ENABLED(CONFIG_IPV6)
1563 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1564 struct net_bridge_port *port,
1565 struct sk_buff *skb,
1566 u16 vid)
1567 {
1568 struct sk_buff *skb2;
1569 const struct ipv6hdr *ip6h;
1570 u8 icmp6_type;
1571 u8 nexthdr;
1572 __be16 frag_off;
1573 unsigned int len;
1574 int offset;
1575 int err;
1576
1577 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1578 return -EINVAL;
1579
1580 ip6h = ipv6_hdr(skb);
1581
1582 /*
1583 * We're interested in MLD messages only.
1584 * - Version is 6
1585 * - MLD has always Router Alert hop-by-hop option
1586 * - But we do not support jumbrograms.
1587 */
1588 if (ip6h->version != 6)
1589 return 0;
1590
1591 /* Prevent flooding this packet if there is no listener present */
1592 if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
1593 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1594
1595 if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
1596 ip6h->payload_len == 0)
1597 return 0;
1598
1599 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1600 if (skb->len < len)
1601 return -EINVAL;
1602
1603 nexthdr = ip6h->nexthdr;
1604 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1605
1606 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1607 return 0;
1608
1609 /* Okay, we found ICMPv6 header */
1610 skb2 = skb_clone(skb, GFP_ATOMIC);
1611 if (!skb2)
1612 return -ENOMEM;
1613
1614 err = -EINVAL;
1615 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1616 goto out;
1617
1618 len -= offset - skb_network_offset(skb2);
1619
1620 __skb_pull(skb2, offset);
1621 skb_reset_transport_header(skb2);
1622 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1623 skb_network_header_len(skb2));
1624
1625 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1626
1627 switch (icmp6_type) {
1628 case ICMPV6_MGM_QUERY:
1629 case ICMPV6_MGM_REPORT:
1630 case ICMPV6_MGM_REDUCTION:
1631 case ICMPV6_MLD2_REPORT:
1632 break;
1633 default:
1634 err = 0;
1635 goto out;
1636 }
1637
1638 /* Okay, we found MLD message. Check further. */
1639 if (skb2->len > len) {
1640 err = pskb_trim_rcsum(skb2, len);
1641 if (err)
1642 goto out;
1643 err = -EINVAL;
1644 }
1645
1646 ip6h = ipv6_hdr(skb2);
1647
1648 switch (skb2->ip_summed) {
1649 case CHECKSUM_COMPLETE:
1650 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1651 IPPROTO_ICMPV6, skb2->csum))
1652 break;
1653 /*FALLTHROUGH*/
1654 case CHECKSUM_NONE:
1655 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1656 &ip6h->daddr,
1657 skb2->len,
1658 IPPROTO_ICMPV6, 0));
1659 if (__skb_checksum_complete(skb2))
1660 goto out;
1661 }
1662
1663 err = 0;
1664
1665 BR_INPUT_SKB_CB(skb)->igmp = 1;
1666
1667 switch (icmp6_type) {
1668 case ICMPV6_MGM_REPORT:
1669 {
1670 struct mld_msg *mld;
1671 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1672 err = -EINVAL;
1673 goto out;
1674 }
1675 mld = (struct mld_msg *)skb_transport_header(skb2);
1676 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1677 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1678 break;
1679 }
1680 case ICMPV6_MLD2_REPORT:
1681 err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
1682 break;
1683 case ICMPV6_MGM_QUERY:
1684 err = br_ip6_multicast_query(br, port, skb2, vid);
1685 break;
1686 case ICMPV6_MGM_REDUCTION:
1687 {
1688 struct mld_msg *mld;
1689 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1690 err = -EINVAL;
1691 goto out;
1692 }
1693 mld = (struct mld_msg *)skb_transport_header(skb2);
1694 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1695 }
1696 }
1697
1698 out:
1699 kfree_skb(skb2);
1700 return err;
1701 }
1702 #endif
1703
1704 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1705 struct sk_buff *skb, u16 vid)
1706 {
1707 BR_INPUT_SKB_CB(skb)->igmp = 0;
1708 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1709
1710 if (br->multicast_disabled)
1711 return 0;
1712
1713 switch (skb->protocol) {
1714 case htons(ETH_P_IP):
1715 return br_multicast_ipv4_rcv(br, port, skb, vid);
1716 #if IS_ENABLED(CONFIG_IPV6)
1717 case htons(ETH_P_IPV6):
1718 return br_multicast_ipv6_rcv(br, port, skb, vid);
1719 #endif
1720 }
1721
1722 return 0;
1723 }
1724
1725 static void br_multicast_query_expired(struct net_bridge *br,
1726 struct bridge_mcast_query *query)
1727 {
1728 spin_lock(&br->multicast_lock);
1729 if (query->startup_sent < br->multicast_startup_query_count)
1730 query->startup_sent++;
1731
1732 br_multicast_send_query(br, NULL, query);
1733 spin_unlock(&br->multicast_lock);
1734 }
1735
1736 static void br_ip4_multicast_query_expired(unsigned long data)
1737 {
1738 struct net_bridge *br = (void *)data;
1739
1740 br_multicast_query_expired(br, &br->ip4_query);
1741 }
1742
1743 #if IS_ENABLED(CONFIG_IPV6)
1744 static void br_ip6_multicast_query_expired(unsigned long data)
1745 {
1746 struct net_bridge *br = (void *)data;
1747
1748 br_multicast_query_expired(br, &br->ip6_query);
1749 }
1750 #endif
1751
1752 void br_multicast_init(struct net_bridge *br)
1753 {
1754 br->hash_elasticity = 4;
1755 br->hash_max = 512;
1756
1757 br->multicast_router = 1;
1758 br->multicast_querier = 0;
1759 br->multicast_query_use_ifaddr = 0;
1760 br->multicast_last_member_count = 2;
1761 br->multicast_startup_query_count = 2;
1762
1763 br->multicast_last_member_interval = HZ;
1764 br->multicast_query_response_interval = 10 * HZ;
1765 br->multicast_startup_query_interval = 125 * HZ / 4;
1766 br->multicast_query_interval = 125 * HZ;
1767 br->multicast_querier_interval = 255 * HZ;
1768 br->multicast_membership_interval = 260 * HZ;
1769
1770 br->ip4_querier.delay_time = 0;
1771 #if IS_ENABLED(CONFIG_IPV6)
1772 br->ip6_querier.delay_time = 0;
1773 #endif
1774
1775 spin_lock_init(&br->multicast_lock);
1776 setup_timer(&br->multicast_router_timer,
1777 br_multicast_local_router_expired, 0);
1778 setup_timer(&br->ip4_querier.timer, br_ip4_multicast_querier_expired,
1779 (unsigned long)br);
1780 setup_timer(&br->ip4_query.timer, br_ip4_multicast_query_expired,
1781 (unsigned long)br);
1782 #if IS_ENABLED(CONFIG_IPV6)
1783 setup_timer(&br->ip6_querier.timer, br_ip6_multicast_querier_expired,
1784 (unsigned long)br);
1785 setup_timer(&br->ip6_query.timer, br_ip6_multicast_query_expired,
1786 (unsigned long)br);
1787 #endif
1788 }
1789
1790 static void __br_multicast_open(struct net_bridge *br,
1791 struct bridge_mcast_query *query)
1792 {
1793 query->startup_sent = 0;
1794
1795 if (br->multicast_disabled)
1796 return;
1797
1798 mod_timer(&query->timer, jiffies);
1799 }
1800
1801 void br_multicast_open(struct net_bridge *br)
1802 {
1803 __br_multicast_open(br, &br->ip4_query);
1804 #if IS_ENABLED(CONFIG_IPV6)
1805 __br_multicast_open(br, &br->ip6_query);
1806 #endif
1807 }
1808
1809 void br_multicast_stop(struct net_bridge *br)
1810 {
1811 struct net_bridge_mdb_htable *mdb;
1812 struct net_bridge_mdb_entry *mp;
1813 struct hlist_node *n;
1814 u32 ver;
1815 int i;
1816
1817 del_timer_sync(&br->multicast_router_timer);
1818 del_timer_sync(&br->ip4_querier.timer);
1819 del_timer_sync(&br->ip4_query.timer);
1820 #if IS_ENABLED(CONFIG_IPV6)
1821 del_timer_sync(&br->ip6_querier.timer);
1822 del_timer_sync(&br->ip6_query.timer);
1823 #endif
1824
1825 spin_lock_bh(&br->multicast_lock);
1826 mdb = mlock_dereference(br->mdb, br);
1827 if (!mdb)
1828 goto out;
1829
1830 br->mdb = NULL;
1831
1832 ver = mdb->ver;
1833 for (i = 0; i < mdb->max; i++) {
1834 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1835 hlist[ver]) {
1836 del_timer(&mp->timer);
1837 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1838 }
1839 }
1840
1841 if (mdb->old) {
1842 spin_unlock_bh(&br->multicast_lock);
1843 rcu_barrier_bh();
1844 spin_lock_bh(&br->multicast_lock);
1845 WARN_ON(mdb->old);
1846 }
1847
1848 mdb->old = mdb;
1849 call_rcu_bh(&mdb->rcu, br_mdb_free);
1850
1851 out:
1852 spin_unlock_bh(&br->multicast_lock);
1853 }
1854
1855 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1856 {
1857 int err = -ENOENT;
1858
1859 spin_lock_bh(&br->multicast_lock);
1860 if (!netif_running(br->dev))
1861 goto unlock;
1862
1863 switch (val) {
1864 case 0:
1865 case 2:
1866 del_timer(&br->multicast_router_timer);
1867 /* fall through */
1868 case 1:
1869 br->multicast_router = val;
1870 err = 0;
1871 break;
1872
1873 default:
1874 err = -EINVAL;
1875 break;
1876 }
1877
1878 unlock:
1879 spin_unlock_bh(&br->multicast_lock);
1880
1881 return err;
1882 }
1883
1884 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1885 {
1886 struct net_bridge *br = p->br;
1887 int err = -ENOENT;
1888
1889 spin_lock(&br->multicast_lock);
1890 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1891 goto unlock;
1892
1893 switch (val) {
1894 case 0:
1895 case 1:
1896 case 2:
1897 p->multicast_router = val;
1898 err = 0;
1899
1900 if (val < 2 && !hlist_unhashed(&p->rlist))
1901 hlist_del_init_rcu(&p->rlist);
1902
1903 if (val == 1)
1904 break;
1905
1906 del_timer(&p->multicast_router_timer);
1907
1908 if (val == 0)
1909 break;
1910
1911 br_multicast_add_router(br, p);
1912 break;
1913
1914 default:
1915 err = -EINVAL;
1916 break;
1917 }
1918
1919 unlock:
1920 spin_unlock(&br->multicast_lock);
1921
1922 return err;
1923 }
1924
1925 static void br_multicast_start_querier(struct net_bridge *br,
1926 struct bridge_mcast_query *query)
1927 {
1928 struct net_bridge_port *port;
1929
1930 __br_multicast_open(br, query);
1931
1932 list_for_each_entry(port, &br->port_list, list) {
1933 if (port->state == BR_STATE_DISABLED ||
1934 port->state == BR_STATE_BLOCKING)
1935 continue;
1936
1937 if (query == &br->ip4_query)
1938 br_multicast_enable(&port->ip4_query);
1939 #if IS_ENABLED(CONFIG_IPV6)
1940 else
1941 br_multicast_enable(&port->ip6_query);
1942 #endif
1943 }
1944 }
1945
1946 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1947 {
1948 int err = 0;
1949 struct net_bridge_mdb_htable *mdb;
1950
1951 spin_lock_bh(&br->multicast_lock);
1952 if (br->multicast_disabled == !val)
1953 goto unlock;
1954
1955 br->multicast_disabled = !val;
1956 if (br->multicast_disabled)
1957 goto unlock;
1958
1959 if (!netif_running(br->dev))
1960 goto unlock;
1961
1962 mdb = mlock_dereference(br->mdb, br);
1963 if (mdb) {
1964 if (mdb->old) {
1965 err = -EEXIST;
1966 rollback:
1967 br->multicast_disabled = !!val;
1968 goto unlock;
1969 }
1970
1971 err = br_mdb_rehash(&br->mdb, mdb->max,
1972 br->hash_elasticity);
1973 if (err)
1974 goto rollback;
1975 }
1976
1977 br_multicast_start_querier(br, &br->ip4_query);
1978 #if IS_ENABLED(CONFIG_IPV6)
1979 br_multicast_start_querier(br, &br->ip6_query);
1980 #endif
1981
1982 unlock:
1983 spin_unlock_bh(&br->multicast_lock);
1984
1985 return err;
1986 }
1987
1988 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1989 {
1990 unsigned long max_delay;
1991
1992 val = !!val;
1993
1994 spin_lock_bh(&br->multicast_lock);
1995 if (br->multicast_querier == val)
1996 goto unlock;
1997
1998 br->multicast_querier = val;
1999 if (!val)
2000 goto unlock;
2001
2002 max_delay = br->multicast_query_response_interval;
2003
2004 if (!timer_pending(&br->ip4_querier.timer))
2005 br->ip4_querier.delay_time = jiffies + max_delay;
2006
2007 br_multicast_start_querier(br, &br->ip4_query);
2008
2009 #if IS_ENABLED(CONFIG_IPV6)
2010 if (!timer_pending(&br->ip6_querier.timer))
2011 br->ip6_querier.delay_time = jiffies + max_delay;
2012
2013 br_multicast_start_querier(br, &br->ip6_query);
2014 #endif
2015
2016 unlock:
2017 spin_unlock_bh(&br->multicast_lock);
2018
2019 return 0;
2020 }
2021
2022 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2023 {
2024 int err = -ENOENT;
2025 u32 old;
2026 struct net_bridge_mdb_htable *mdb;
2027
2028 spin_lock_bh(&br->multicast_lock);
2029 if (!netif_running(br->dev))
2030 goto unlock;
2031
2032 err = -EINVAL;
2033 if (!is_power_of_2(val))
2034 goto unlock;
2035
2036 mdb = mlock_dereference(br->mdb, br);
2037 if (mdb && val < mdb->size)
2038 goto unlock;
2039
2040 err = 0;
2041
2042 old = br->hash_max;
2043 br->hash_max = val;
2044
2045 if (mdb) {
2046 if (mdb->old) {
2047 err = -EEXIST;
2048 rollback:
2049 br->hash_max = old;
2050 goto unlock;
2051 }
2052
2053 err = br_mdb_rehash(&br->mdb, br->hash_max,
2054 br->hash_elasticity);
2055 if (err)
2056 goto rollback;
2057 }
2058
2059 unlock:
2060 spin_unlock_bh(&br->multicast_lock);
2061
2062 return err;
2063 }
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