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Merge remote-tracking branch 'asoc/fix/kirkwood' into asoc-linus
[mirror_ubuntu-artful-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 #endif
33
34 #include "br_private.h"
35
36 static void br_multicast_start_querier(struct net_bridge *br,
37 struct bridge_mcast_query *query);
38 unsigned int br_mdb_rehash_seq;
39
40 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
41 {
42 if (a->proto != b->proto)
43 return 0;
44 if (a->vid != b->vid)
45 return 0;
46 switch (a->proto) {
47 case htons(ETH_P_IP):
48 return a->u.ip4 == b->u.ip4;
49 #if IS_ENABLED(CONFIG_IPV6)
50 case htons(ETH_P_IPV6):
51 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
52 #endif
53 }
54 return 0;
55 }
56
57 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
58 __u16 vid)
59 {
60 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
61 }
62
63 #if IS_ENABLED(CONFIG_IPV6)
64 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
65 const struct in6_addr *ip,
66 __u16 vid)
67 {
68 return jhash_2words(ipv6_addr_hash(ip), vid,
69 mdb->secret) & (mdb->max - 1);
70 }
71 #endif
72
73 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
74 struct br_ip *ip)
75 {
76 switch (ip->proto) {
77 case htons(ETH_P_IP):
78 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
79 #if IS_ENABLED(CONFIG_IPV6)
80 case htons(ETH_P_IPV6):
81 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
82 #endif
83 }
84 return 0;
85 }
86
87 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
88 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
89 {
90 struct net_bridge_mdb_entry *mp;
91
92 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
93 if (br_ip_equal(&mp->addr, dst))
94 return mp;
95 }
96
97 return NULL;
98 }
99
100 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
101 struct br_ip *dst)
102 {
103 if (!mdb)
104 return NULL;
105
106 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
107 }
108
109 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
110 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
111 {
112 struct br_ip br_dst;
113
114 br_dst.u.ip4 = dst;
115 br_dst.proto = htons(ETH_P_IP);
116 br_dst.vid = vid;
117
118 return br_mdb_ip_get(mdb, &br_dst);
119 }
120
121 #if IS_ENABLED(CONFIG_IPV6)
122 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
123 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
124 __u16 vid)
125 {
126 struct br_ip br_dst;
127
128 br_dst.u.ip6 = *dst;
129 br_dst.proto = htons(ETH_P_IPV6);
130 br_dst.vid = vid;
131
132 return br_mdb_ip_get(mdb, &br_dst);
133 }
134 #endif
135
136 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
137 struct sk_buff *skb, u16 vid)
138 {
139 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
140 struct br_ip ip;
141
142 if (br->multicast_disabled)
143 return NULL;
144
145 if (BR_INPUT_SKB_CB(skb)->igmp)
146 return NULL;
147
148 ip.proto = skb->protocol;
149 ip.vid = vid;
150
151 switch (skb->protocol) {
152 case htons(ETH_P_IP):
153 ip.u.ip4 = ip_hdr(skb)->daddr;
154 break;
155 #if IS_ENABLED(CONFIG_IPV6)
156 case htons(ETH_P_IPV6):
157 ip.u.ip6 = ipv6_hdr(skb)->daddr;
158 break;
159 #endif
160 default:
161 return NULL;
162 }
163
164 return br_mdb_ip_get(mdb, &ip);
165 }
166
167 static void br_mdb_free(struct rcu_head *head)
168 {
169 struct net_bridge_mdb_htable *mdb =
170 container_of(head, struct net_bridge_mdb_htable, rcu);
171 struct net_bridge_mdb_htable *old = mdb->old;
172
173 mdb->old = NULL;
174 kfree(old->mhash);
175 kfree(old);
176 }
177
178 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
179 struct net_bridge_mdb_htable *old,
180 int elasticity)
181 {
182 struct net_bridge_mdb_entry *mp;
183 int maxlen;
184 int len;
185 int i;
186
187 for (i = 0; i < old->max; i++)
188 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
189 hlist_add_head(&mp->hlist[new->ver],
190 &new->mhash[br_ip_hash(new, &mp->addr)]);
191
192 if (!elasticity)
193 return 0;
194
195 maxlen = 0;
196 for (i = 0; i < new->max; i++) {
197 len = 0;
198 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
199 len++;
200 if (len > maxlen)
201 maxlen = len;
202 }
203
204 return maxlen > elasticity ? -EINVAL : 0;
205 }
206
207 void br_multicast_free_pg(struct rcu_head *head)
208 {
209 struct net_bridge_port_group *p =
210 container_of(head, struct net_bridge_port_group, rcu);
211
212 kfree(p);
213 }
214
215 static void br_multicast_free_group(struct rcu_head *head)
216 {
217 struct net_bridge_mdb_entry *mp =
218 container_of(head, struct net_bridge_mdb_entry, rcu);
219
220 kfree(mp);
221 }
222
223 static void br_multicast_group_expired(unsigned long data)
224 {
225 struct net_bridge_mdb_entry *mp = (void *)data;
226 struct net_bridge *br = mp->br;
227 struct net_bridge_mdb_htable *mdb;
228
229 spin_lock(&br->multicast_lock);
230 if (!netif_running(br->dev) || timer_pending(&mp->timer))
231 goto out;
232
233 mp->mglist = false;
234
235 if (mp->ports)
236 goto out;
237
238 mdb = mlock_dereference(br->mdb, br);
239
240 hlist_del_rcu(&mp->hlist[mdb->ver]);
241 mdb->size--;
242
243 call_rcu_bh(&mp->rcu, br_multicast_free_group);
244
245 out:
246 spin_unlock(&br->multicast_lock);
247 }
248
249 static void br_multicast_del_pg(struct net_bridge *br,
250 struct net_bridge_port_group *pg)
251 {
252 struct net_bridge_mdb_htable *mdb;
253 struct net_bridge_mdb_entry *mp;
254 struct net_bridge_port_group *p;
255 struct net_bridge_port_group __rcu **pp;
256
257 mdb = mlock_dereference(br->mdb, br);
258
259 mp = br_mdb_ip_get(mdb, &pg->addr);
260 if (WARN_ON(!mp))
261 return;
262
263 for (pp = &mp->ports;
264 (p = mlock_dereference(*pp, br)) != NULL;
265 pp = &p->next) {
266 if (p != pg)
267 continue;
268
269 rcu_assign_pointer(*pp, p->next);
270 hlist_del_init(&p->mglist);
271 del_timer(&p->timer);
272 call_rcu_bh(&p->rcu, br_multicast_free_pg);
273
274 if (!mp->ports && !mp->mglist && mp->timer_armed &&
275 netif_running(br->dev))
276 mod_timer(&mp->timer, jiffies);
277
278 return;
279 }
280
281 WARN_ON(1);
282 }
283
284 static void br_multicast_port_group_expired(unsigned long data)
285 {
286 struct net_bridge_port_group *pg = (void *)data;
287 struct net_bridge *br = pg->port->br;
288
289 spin_lock(&br->multicast_lock);
290 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
291 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
292 goto out;
293
294 br_multicast_del_pg(br, pg);
295
296 out:
297 spin_unlock(&br->multicast_lock);
298 }
299
300 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
301 int elasticity)
302 {
303 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
304 struct net_bridge_mdb_htable *mdb;
305 int err;
306
307 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
308 if (!mdb)
309 return -ENOMEM;
310
311 mdb->max = max;
312 mdb->old = old;
313
314 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
315 if (!mdb->mhash) {
316 kfree(mdb);
317 return -ENOMEM;
318 }
319
320 mdb->size = old ? old->size : 0;
321 mdb->ver = old ? old->ver ^ 1 : 0;
322
323 if (!old || elasticity)
324 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
325 else
326 mdb->secret = old->secret;
327
328 if (!old)
329 goto out;
330
331 err = br_mdb_copy(mdb, old, elasticity);
332 if (err) {
333 kfree(mdb->mhash);
334 kfree(mdb);
335 return err;
336 }
337
338 br_mdb_rehash_seq++;
339 call_rcu_bh(&mdb->rcu, br_mdb_free);
340
341 out:
342 rcu_assign_pointer(*mdbp, mdb);
343
344 return 0;
345 }
346
347 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
348 __be32 group)
349 {
350 struct sk_buff *skb;
351 struct igmphdr *ih;
352 struct ethhdr *eth;
353 struct iphdr *iph;
354
355 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
356 sizeof(*ih) + 4);
357 if (!skb)
358 goto out;
359
360 skb->protocol = htons(ETH_P_IP);
361
362 skb_reset_mac_header(skb);
363 eth = eth_hdr(skb);
364
365 memcpy(eth->h_source, br->dev->dev_addr, 6);
366 eth->h_dest[0] = 1;
367 eth->h_dest[1] = 0;
368 eth->h_dest[2] = 0x5e;
369 eth->h_dest[3] = 0;
370 eth->h_dest[4] = 0;
371 eth->h_dest[5] = 1;
372 eth->h_proto = htons(ETH_P_IP);
373 skb_put(skb, sizeof(*eth));
374
375 skb_set_network_header(skb, skb->len);
376 iph = ip_hdr(skb);
377
378 iph->version = 4;
379 iph->ihl = 6;
380 iph->tos = 0xc0;
381 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
382 iph->id = 0;
383 iph->frag_off = htons(IP_DF);
384 iph->ttl = 1;
385 iph->protocol = IPPROTO_IGMP;
386 iph->saddr = br->multicast_query_use_ifaddr ?
387 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
388 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
389 ((u8 *)&iph[1])[0] = IPOPT_RA;
390 ((u8 *)&iph[1])[1] = 4;
391 ((u8 *)&iph[1])[2] = 0;
392 ((u8 *)&iph[1])[3] = 0;
393 ip_send_check(iph);
394 skb_put(skb, 24);
395
396 skb_set_transport_header(skb, skb->len);
397 ih = igmp_hdr(skb);
398 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
399 ih->code = (group ? br->multicast_last_member_interval :
400 br->multicast_query_response_interval) /
401 (HZ / IGMP_TIMER_SCALE);
402 ih->group = group;
403 ih->csum = 0;
404 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
405 skb_put(skb, sizeof(*ih));
406
407 __skb_pull(skb, sizeof(*eth));
408
409 out:
410 return skb;
411 }
412
413 #if IS_ENABLED(CONFIG_IPV6)
414 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
415 const struct in6_addr *group)
416 {
417 struct sk_buff *skb;
418 struct ipv6hdr *ip6h;
419 struct mld_msg *mldq;
420 struct ethhdr *eth;
421 u8 *hopopt;
422 unsigned long interval;
423
424 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
425 8 + sizeof(*mldq));
426 if (!skb)
427 goto out;
428
429 skb->protocol = htons(ETH_P_IPV6);
430
431 /* Ethernet header */
432 skb_reset_mac_header(skb);
433 eth = eth_hdr(skb);
434
435 memcpy(eth->h_source, br->dev->dev_addr, 6);
436 eth->h_proto = htons(ETH_P_IPV6);
437 skb_put(skb, sizeof(*eth));
438
439 /* IPv6 header + HbH option */
440 skb_set_network_header(skb, skb->len);
441 ip6h = ipv6_hdr(skb);
442
443 *(__force __be32 *)ip6h = htonl(0x60000000);
444 ip6h->payload_len = htons(8 + sizeof(*mldq));
445 ip6h->nexthdr = IPPROTO_HOPOPTS;
446 ip6h->hop_limit = 1;
447 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
448 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
449 &ip6h->saddr)) {
450 kfree_skb(skb);
451 return NULL;
452 }
453 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
454
455 hopopt = (u8 *)(ip6h + 1);
456 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
457 hopopt[1] = 0; /* length of HbH */
458 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
459 hopopt[3] = 2; /* Length of RA Option */
460 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
461 hopopt[5] = 0;
462 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
463 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
464
465 skb_put(skb, sizeof(*ip6h) + 8);
466
467 /* ICMPv6 */
468 skb_set_transport_header(skb, skb->len);
469 mldq = (struct mld_msg *) icmp6_hdr(skb);
470
471 interval = ipv6_addr_any(group) ?
472 br->multicast_query_response_interval :
473 br->multicast_last_member_interval;
474
475 mldq->mld_type = ICMPV6_MGM_QUERY;
476 mldq->mld_code = 0;
477 mldq->mld_cksum = 0;
478 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
479 mldq->mld_reserved = 0;
480 mldq->mld_mca = *group;
481
482 /* checksum */
483 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
484 sizeof(*mldq), IPPROTO_ICMPV6,
485 csum_partial(mldq,
486 sizeof(*mldq), 0));
487 skb_put(skb, sizeof(*mldq));
488
489 __skb_pull(skb, sizeof(*eth));
490
491 out:
492 return skb;
493 }
494 #endif
495
496 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
497 struct br_ip *addr)
498 {
499 switch (addr->proto) {
500 case htons(ETH_P_IP):
501 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
502 #if IS_ENABLED(CONFIG_IPV6)
503 case htons(ETH_P_IPV6):
504 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
505 #endif
506 }
507 return NULL;
508 }
509
510 static struct net_bridge_mdb_entry *br_multicast_get_group(
511 struct net_bridge *br, struct net_bridge_port *port,
512 struct br_ip *group, int hash)
513 {
514 struct net_bridge_mdb_htable *mdb;
515 struct net_bridge_mdb_entry *mp;
516 unsigned int count = 0;
517 unsigned int max;
518 int elasticity;
519 int err;
520
521 mdb = rcu_dereference_protected(br->mdb, 1);
522 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
523 count++;
524 if (unlikely(br_ip_equal(group, &mp->addr)))
525 return mp;
526 }
527
528 elasticity = 0;
529 max = mdb->max;
530
531 if (unlikely(count > br->hash_elasticity && count)) {
532 if (net_ratelimit())
533 br_info(br, "Multicast hash table "
534 "chain limit reached: %s\n",
535 port ? port->dev->name : br->dev->name);
536
537 elasticity = br->hash_elasticity;
538 }
539
540 if (mdb->size >= max) {
541 max *= 2;
542 if (unlikely(max > br->hash_max)) {
543 br_warn(br, "Multicast hash table maximum of %d "
544 "reached, disabling snooping: %s\n",
545 br->hash_max,
546 port ? port->dev->name : br->dev->name);
547 err = -E2BIG;
548 disable:
549 br->multicast_disabled = 1;
550 goto err;
551 }
552 }
553
554 if (max > mdb->max || elasticity) {
555 if (mdb->old) {
556 if (net_ratelimit())
557 br_info(br, "Multicast hash table "
558 "on fire: %s\n",
559 port ? port->dev->name : br->dev->name);
560 err = -EEXIST;
561 goto err;
562 }
563
564 err = br_mdb_rehash(&br->mdb, max, elasticity);
565 if (err) {
566 br_warn(br, "Cannot rehash multicast "
567 "hash table, disabling snooping: %s, %d, %d\n",
568 port ? port->dev->name : br->dev->name,
569 mdb->size, err);
570 goto disable;
571 }
572
573 err = -EAGAIN;
574 goto err;
575 }
576
577 return NULL;
578
579 err:
580 mp = ERR_PTR(err);
581 return mp;
582 }
583
584 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
585 struct net_bridge_port *port, struct br_ip *group)
586 {
587 struct net_bridge_mdb_htable *mdb;
588 struct net_bridge_mdb_entry *mp;
589 int hash;
590 int err;
591
592 mdb = rcu_dereference_protected(br->mdb, 1);
593 if (!mdb) {
594 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
595 if (err)
596 return ERR_PTR(err);
597 goto rehash;
598 }
599
600 hash = br_ip_hash(mdb, group);
601 mp = br_multicast_get_group(br, port, group, hash);
602 switch (PTR_ERR(mp)) {
603 case 0:
604 break;
605
606 case -EAGAIN:
607 rehash:
608 mdb = rcu_dereference_protected(br->mdb, 1);
609 hash = br_ip_hash(mdb, group);
610 break;
611
612 default:
613 goto out;
614 }
615
616 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
617 if (unlikely(!mp))
618 return ERR_PTR(-ENOMEM);
619
620 mp->br = br;
621 mp->addr = *group;
622
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 int err;
663
664 spin_lock(&br->multicast_lock);
665 if (!netif_running(br->dev) ||
666 (port && port->state == BR_STATE_DISABLED))
667 goto out;
668
669 mp = br_multicast_new_group(br, port, group);
670 err = PTR_ERR(mp);
671 if (IS_ERR(mp))
672 goto err;
673
674 if (!port) {
675 mp->mglist = true;
676 goto out;
677 }
678
679 for (pp = &mp->ports;
680 (p = mlock_dereference(*pp, br)) != NULL;
681 pp = &p->next) {
682 if (p->port == port)
683 goto out;
684 if ((unsigned long)p->port < (unsigned long)port)
685 break;
686 }
687
688 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
689 if (unlikely(!p))
690 goto err;
691 rcu_assign_pointer(*pp, p);
692 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
693
694 out:
695 err = 0;
696
697 err:
698 spin_unlock(&br->multicast_lock);
699 return err;
700 }
701
702 static int br_ip4_multicast_add_group(struct net_bridge *br,
703 struct net_bridge_port *port,
704 __be32 group,
705 __u16 vid)
706 {
707 struct br_ip br_group;
708
709 if (ipv4_is_local_multicast(group))
710 return 0;
711
712 br_group.u.ip4 = group;
713 br_group.proto = htons(ETH_P_IP);
714 br_group.vid = vid;
715
716 return br_multicast_add_group(br, port, &br_group);
717 }
718
719 #if IS_ENABLED(CONFIG_IPV6)
720 static int br_ip6_multicast_add_group(struct net_bridge *br,
721 struct net_bridge_port *port,
722 const struct in6_addr *group,
723 __u16 vid)
724 {
725 struct br_ip br_group;
726
727 if (!ipv6_is_transient_multicast(group))
728 return 0;
729
730 br_group.u.ip6 = *group;
731 br_group.proto = htons(ETH_P_IPV6);
732 br_group.vid = vid;
733
734 return br_multicast_add_group(br, port, &br_group);
735 }
736 #endif
737
738 static void br_multicast_router_expired(unsigned long data)
739 {
740 struct net_bridge_port *port = (void *)data;
741 struct net_bridge *br = port->br;
742
743 spin_lock(&br->multicast_lock);
744 if (port->multicast_router != 1 ||
745 timer_pending(&port->multicast_router_timer) ||
746 hlist_unhashed(&port->rlist))
747 goto out;
748
749 hlist_del_init_rcu(&port->rlist);
750
751 out:
752 spin_unlock(&br->multicast_lock);
753 }
754
755 static void br_multicast_local_router_expired(unsigned long data)
756 {
757 }
758
759 static void br_multicast_querier_expired(struct net_bridge *br,
760 struct bridge_mcast_query *query)
761 {
762 spin_lock(&br->multicast_lock);
763 if (!netif_running(br->dev) || br->multicast_disabled)
764 goto out;
765
766 br_multicast_start_querier(br, query);
767
768 out:
769 spin_unlock(&br->multicast_lock);
770 }
771
772 static void br_ip4_multicast_querier_expired(unsigned long data)
773 {
774 struct net_bridge *br = (void *)data;
775
776 br_multicast_querier_expired(br, &br->ip4_query);
777 }
778
779 #if IS_ENABLED(CONFIG_IPV6)
780 static void br_ip6_multicast_querier_expired(unsigned long data)
781 {
782 struct net_bridge *br = (void *)data;
783
784 br_multicast_querier_expired(br, &br->ip6_query);
785 }
786 #endif
787
788 static void __br_multicast_send_query(struct net_bridge *br,
789 struct net_bridge_port *port,
790 struct br_ip *ip)
791 {
792 struct sk_buff *skb;
793
794 skb = br_multicast_alloc_query(br, ip);
795 if (!skb)
796 return;
797
798 if (port) {
799 __skb_push(skb, sizeof(struct ethhdr));
800 skb->dev = port->dev;
801 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
802 dev_queue_xmit);
803 } else
804 netif_rx(skb);
805 }
806
807 static void br_multicast_send_query(struct net_bridge *br,
808 struct net_bridge_port *port,
809 struct bridge_mcast_query *query)
810 {
811 unsigned long time;
812 struct br_ip br_group;
813 struct bridge_mcast_querier *querier = NULL;
814
815 if (!netif_running(br->dev) || br->multicast_disabled ||
816 !br->multicast_querier)
817 return;
818
819 memset(&br_group.u, 0, sizeof(br_group.u));
820
821 if (port ? (query == &port->ip4_query) :
822 (query == &br->ip4_query)) {
823 querier = &br->ip4_querier;
824 br_group.proto = htons(ETH_P_IP);
825 #if IS_ENABLED(CONFIG_IPV6)
826 } else {
827 querier = &br->ip6_querier;
828 br_group.proto = htons(ETH_P_IPV6);
829 #endif
830 }
831
832 if (!querier || timer_pending(&querier->timer))
833 return;
834
835 __br_multicast_send_query(br, port, &br_group);
836
837 time = jiffies;
838 time += query->startup_sent < br->multicast_startup_query_count ?
839 br->multicast_startup_query_interval :
840 br->multicast_query_interval;
841 mod_timer(&query->timer, time);
842 }
843
844 static void br_multicast_port_query_expired(struct net_bridge_port *port,
845 struct bridge_mcast_query *query)
846 {
847 struct net_bridge *br = port->br;
848
849 spin_lock(&br->multicast_lock);
850 if (port->state == BR_STATE_DISABLED ||
851 port->state == BR_STATE_BLOCKING)
852 goto out;
853
854 if (query->startup_sent < br->multicast_startup_query_count)
855 query->startup_sent++;
856
857 br_multicast_send_query(port->br, port, query);
858
859 out:
860 spin_unlock(&br->multicast_lock);
861 }
862
863 static void br_ip4_multicast_port_query_expired(unsigned long data)
864 {
865 struct net_bridge_port *port = (void *)data;
866
867 br_multicast_port_query_expired(port, &port->ip4_query);
868 }
869
870 #if IS_ENABLED(CONFIG_IPV6)
871 static void br_ip6_multicast_port_query_expired(unsigned long data)
872 {
873 struct net_bridge_port *port = (void *)data;
874
875 br_multicast_port_query_expired(port, &port->ip6_query);
876 }
877 #endif
878
879 void br_multicast_add_port(struct net_bridge_port *port)
880 {
881 port->multicast_router = 1;
882
883 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
884 (unsigned long)port);
885 setup_timer(&port->ip4_query.timer, br_ip4_multicast_port_query_expired,
886 (unsigned long)port);
887 #if IS_ENABLED(CONFIG_IPV6)
888 setup_timer(&port->ip6_query.timer, br_ip6_multicast_port_query_expired,
889 (unsigned long)port);
890 #endif
891 }
892
893 void br_multicast_del_port(struct net_bridge_port *port)
894 {
895 del_timer_sync(&port->multicast_router_timer);
896 }
897
898 static void br_multicast_enable(struct bridge_mcast_query *query)
899 {
900 query->startup_sent = 0;
901
902 if (try_to_del_timer_sync(&query->timer) >= 0 ||
903 del_timer(&query->timer))
904 mod_timer(&query->timer, jiffies);
905 }
906
907 void br_multicast_enable_port(struct net_bridge_port *port)
908 {
909 struct net_bridge *br = port->br;
910
911 spin_lock(&br->multicast_lock);
912 if (br->multicast_disabled || !netif_running(br->dev))
913 goto out;
914
915 br_multicast_enable(&port->ip4_query);
916 #if IS_ENABLED(CONFIG_IPV6)
917 br_multicast_enable(&port->ip6_query);
918 #endif
919
920 out:
921 spin_unlock(&br->multicast_lock);
922 }
923
924 void br_multicast_disable_port(struct net_bridge_port *port)
925 {
926 struct net_bridge *br = port->br;
927 struct net_bridge_port_group *pg;
928 struct hlist_node *n;
929
930 spin_lock(&br->multicast_lock);
931 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
932 br_multicast_del_pg(br, pg);
933
934 if (!hlist_unhashed(&port->rlist))
935 hlist_del_init_rcu(&port->rlist);
936 del_timer(&port->multicast_router_timer);
937 del_timer(&port->ip4_query.timer);
938 #if IS_ENABLED(CONFIG_IPV6)
939 del_timer(&port->ip6_query.timer);
940 #endif
941 spin_unlock(&br->multicast_lock);
942 }
943
944 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
945 struct net_bridge_port *port,
946 struct sk_buff *skb)
947 {
948 struct igmpv3_report *ih;
949 struct igmpv3_grec *grec;
950 int i;
951 int len;
952 int num;
953 int type;
954 int err = 0;
955 __be32 group;
956 u16 vid = 0;
957
958 if (!pskb_may_pull(skb, sizeof(*ih)))
959 return -EINVAL;
960
961 br_vlan_get_tag(skb, &vid);
962 ih = igmpv3_report_hdr(skb);
963 num = ntohs(ih->ngrec);
964 len = sizeof(*ih);
965
966 for (i = 0; i < num; i++) {
967 len += sizeof(*grec);
968 if (!pskb_may_pull(skb, len))
969 return -EINVAL;
970
971 grec = (void *)(skb->data + len - sizeof(*grec));
972 group = grec->grec_mca;
973 type = grec->grec_type;
974
975 len += ntohs(grec->grec_nsrcs) * 4;
976 if (!pskb_may_pull(skb, len))
977 return -EINVAL;
978
979 /* We treat this as an IGMPv2 report for now. */
980 switch (type) {
981 case IGMPV3_MODE_IS_INCLUDE:
982 case IGMPV3_MODE_IS_EXCLUDE:
983 case IGMPV3_CHANGE_TO_INCLUDE:
984 case IGMPV3_CHANGE_TO_EXCLUDE:
985 case IGMPV3_ALLOW_NEW_SOURCES:
986 case IGMPV3_BLOCK_OLD_SOURCES:
987 break;
988
989 default:
990 continue;
991 }
992
993 err = br_ip4_multicast_add_group(br, port, group, vid);
994 if (err)
995 break;
996 }
997
998 return err;
999 }
1000
1001 #if IS_ENABLED(CONFIG_IPV6)
1002 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1003 struct net_bridge_port *port,
1004 struct sk_buff *skb)
1005 {
1006 struct icmp6hdr *icmp6h;
1007 struct mld2_grec *grec;
1008 int i;
1009 int len;
1010 int num;
1011 int err = 0;
1012 u16 vid = 0;
1013
1014 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1015 return -EINVAL;
1016
1017 br_vlan_get_tag(skb, &vid);
1018 icmp6h = icmp6_hdr(skb);
1019 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1020 len = sizeof(*icmp6h);
1021
1022 for (i = 0; i < num; i++) {
1023 __be16 *nsrcs, _nsrcs;
1024
1025 nsrcs = skb_header_pointer(skb,
1026 len + offsetof(struct mld2_grec,
1027 grec_nsrcs),
1028 sizeof(_nsrcs), &_nsrcs);
1029 if (!nsrcs)
1030 return -EINVAL;
1031
1032 if (!pskb_may_pull(skb,
1033 len + sizeof(*grec) +
1034 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1035 return -EINVAL;
1036
1037 grec = (struct mld2_grec *)(skb->data + len);
1038 len += sizeof(*grec) +
1039 sizeof(struct in6_addr) * ntohs(*nsrcs);
1040
1041 /* We treat these as MLDv1 reports for now. */
1042 switch (grec->grec_type) {
1043 case MLD2_MODE_IS_INCLUDE:
1044 case MLD2_MODE_IS_EXCLUDE:
1045 case MLD2_CHANGE_TO_INCLUDE:
1046 case MLD2_CHANGE_TO_EXCLUDE:
1047 case MLD2_ALLOW_NEW_SOURCES:
1048 case MLD2_BLOCK_OLD_SOURCES:
1049 break;
1050
1051 default:
1052 continue;
1053 }
1054
1055 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1056 vid);
1057 if (!err)
1058 break;
1059 }
1060
1061 return err;
1062 }
1063 #endif
1064
1065 static void
1066 br_multicast_update_querier_timer(struct net_bridge *br,
1067 struct bridge_mcast_querier *querier,
1068 unsigned long max_delay)
1069 {
1070 if (!timer_pending(&querier->timer))
1071 querier->delay_time = jiffies + max_delay;
1072
1073 mod_timer(&querier->timer, jiffies + br->multicast_querier_interval);
1074 }
1075
1076 /*
1077 * Add port to router_list
1078 * list is maintained ordered by pointer value
1079 * and locked by br->multicast_lock and RCU
1080 */
1081 static void br_multicast_add_router(struct net_bridge *br,
1082 struct net_bridge_port *port)
1083 {
1084 struct net_bridge_port *p;
1085 struct hlist_node *slot = NULL;
1086
1087 hlist_for_each_entry(p, &br->router_list, rlist) {
1088 if ((unsigned long) port >= (unsigned long) p)
1089 break;
1090 slot = &p->rlist;
1091 }
1092
1093 if (slot)
1094 hlist_add_after_rcu(slot, &port->rlist);
1095 else
1096 hlist_add_head_rcu(&port->rlist, &br->router_list);
1097 }
1098
1099 static void br_multicast_mark_router(struct net_bridge *br,
1100 struct net_bridge_port *port)
1101 {
1102 unsigned long now = jiffies;
1103
1104 if (!port) {
1105 if (br->multicast_router == 1)
1106 mod_timer(&br->multicast_router_timer,
1107 now + br->multicast_querier_interval);
1108 return;
1109 }
1110
1111 if (port->multicast_router != 1)
1112 return;
1113
1114 if (!hlist_unhashed(&port->rlist))
1115 goto timer;
1116
1117 br_multicast_add_router(br, port);
1118
1119 timer:
1120 mod_timer(&port->multicast_router_timer,
1121 now + br->multicast_querier_interval);
1122 }
1123
1124 static void br_multicast_query_received(struct net_bridge *br,
1125 struct net_bridge_port *port,
1126 struct bridge_mcast_querier *querier,
1127 int saddr,
1128 unsigned long max_delay)
1129 {
1130 if (saddr)
1131 br_multicast_update_querier_timer(br, querier, max_delay);
1132 else if (timer_pending(&querier->timer))
1133 return;
1134
1135 br_multicast_mark_router(br, port);
1136 }
1137
1138 static int br_ip4_multicast_query(struct net_bridge *br,
1139 struct net_bridge_port *port,
1140 struct sk_buff *skb)
1141 {
1142 const struct iphdr *iph = ip_hdr(skb);
1143 struct igmphdr *ih = igmp_hdr(skb);
1144 struct net_bridge_mdb_entry *mp;
1145 struct igmpv3_query *ih3;
1146 struct net_bridge_port_group *p;
1147 struct net_bridge_port_group __rcu **pp;
1148 unsigned long max_delay;
1149 unsigned long now = jiffies;
1150 __be32 group;
1151 int err = 0;
1152 u16 vid = 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 group = ih->group;
1160
1161 if (skb->len == sizeof(*ih)) {
1162 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1163
1164 if (!max_delay) {
1165 max_delay = 10 * HZ;
1166 group = 0;
1167 }
1168 } else {
1169 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1170 err = -EINVAL;
1171 goto out;
1172 }
1173
1174 ih3 = igmpv3_query_hdr(skb);
1175 if (ih3->nsrcs)
1176 goto out;
1177
1178 max_delay = ih3->code ?
1179 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1180 }
1181
1182 br_multicast_query_received(br, port, &br->ip4_querier, !!iph->saddr,
1183 max_delay);
1184
1185 if (!group)
1186 goto out;
1187
1188 br_vlan_get_tag(skb, &vid);
1189 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1190 if (!mp)
1191 goto out;
1192
1193 mod_timer(&mp->timer, now + br->multicast_membership_interval);
1194 mp->timer_armed = true;
1195
1196 max_delay *= br->multicast_last_member_count;
1197
1198 if (mp->mglist &&
1199 (timer_pending(&mp->timer) ?
1200 time_after(mp->timer.expires, now + max_delay) :
1201 try_to_del_timer_sync(&mp->timer) >= 0))
1202 mod_timer(&mp->timer, now + max_delay);
1203
1204 for (pp = &mp->ports;
1205 (p = mlock_dereference(*pp, br)) != NULL;
1206 pp = &p->next) {
1207 if (timer_pending(&p->timer) ?
1208 time_after(p->timer.expires, now + max_delay) :
1209 try_to_del_timer_sync(&p->timer) >= 0)
1210 mod_timer(&p->timer, now + max_delay);
1211 }
1212
1213 out:
1214 spin_unlock(&br->multicast_lock);
1215 return err;
1216 }
1217
1218 #if IS_ENABLED(CONFIG_IPV6)
1219 static int br_ip6_multicast_query(struct net_bridge *br,
1220 struct net_bridge_port *port,
1221 struct sk_buff *skb)
1222 {
1223 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1224 struct mld_msg *mld;
1225 struct net_bridge_mdb_entry *mp;
1226 struct mld2_query *mld2q;
1227 struct net_bridge_port_group *p;
1228 struct net_bridge_port_group __rcu **pp;
1229 unsigned long max_delay;
1230 unsigned long now = jiffies;
1231 const struct in6_addr *group = NULL;
1232 int err = 0;
1233 u16 vid = 0;
1234
1235 spin_lock(&br->multicast_lock);
1236 if (!netif_running(br->dev) ||
1237 (port && port->state == BR_STATE_DISABLED))
1238 goto out;
1239
1240 if (skb->len == sizeof(*mld)) {
1241 if (!pskb_may_pull(skb, sizeof(*mld))) {
1242 err = -EINVAL;
1243 goto out;
1244 }
1245 mld = (struct mld_msg *) icmp6_hdr(skb);
1246 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1247 if (max_delay)
1248 group = &mld->mld_mca;
1249 } else {
1250 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1251 err = -EINVAL;
1252 goto out;
1253 }
1254 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1255 if (!mld2q->mld2q_nsrcs)
1256 group = &mld2q->mld2q_mca;
1257
1258 max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mld2q->mld2q_mrc))), 1UL);
1259 }
1260
1261 br_multicast_query_received(br, port, &br->ip6_querier,
1262 !ipv6_addr_any(&ip6h->saddr), max_delay);
1263
1264 if (!group)
1265 goto out;
1266
1267 br_vlan_get_tag(skb, &vid);
1268 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1269 if (!mp)
1270 goto out;
1271
1272 mod_timer(&mp->timer, now + br->multicast_membership_interval);
1273 mp->timer_armed = true;
1274
1275 max_delay *= br->multicast_last_member_count;
1276 if (mp->mglist &&
1277 (timer_pending(&mp->timer) ?
1278 time_after(mp->timer.expires, now + max_delay) :
1279 try_to_del_timer_sync(&mp->timer) >= 0))
1280 mod_timer(&mp->timer, now + max_delay);
1281
1282 for (pp = &mp->ports;
1283 (p = mlock_dereference(*pp, br)) != NULL;
1284 pp = &p->next) {
1285 if (timer_pending(&p->timer) ?
1286 time_after(p->timer.expires, now + max_delay) :
1287 try_to_del_timer_sync(&p->timer) >= 0)
1288 mod_timer(&p->timer, now + max_delay);
1289 }
1290
1291 out:
1292 spin_unlock(&br->multicast_lock);
1293 return err;
1294 }
1295 #endif
1296
1297 static void br_multicast_leave_group(struct net_bridge *br,
1298 struct net_bridge_port *port,
1299 struct br_ip *group,
1300 struct bridge_mcast_querier *querier,
1301 struct bridge_mcast_query *query)
1302 {
1303 struct net_bridge_mdb_htable *mdb;
1304 struct net_bridge_mdb_entry *mp;
1305 struct net_bridge_port_group *p;
1306 unsigned long now;
1307 unsigned long time;
1308
1309 spin_lock(&br->multicast_lock);
1310 if (!netif_running(br->dev) ||
1311 (port && port->state == BR_STATE_DISABLED) ||
1312 timer_pending(&querier->timer))
1313 goto out;
1314
1315 mdb = mlock_dereference(br->mdb, br);
1316 mp = br_mdb_ip_get(mdb, group);
1317 if (!mp)
1318 goto out;
1319
1320 if (br->multicast_querier) {
1321 __br_multicast_send_query(br, port, &mp->addr);
1322
1323 time = jiffies + br->multicast_last_member_count *
1324 br->multicast_last_member_interval;
1325
1326 mod_timer(&query->timer, time);
1327
1328 for (p = mlock_dereference(mp->ports, br);
1329 p != NULL;
1330 p = mlock_dereference(p->next, br)) {
1331 if (p->port != port)
1332 continue;
1333
1334 if (!hlist_unhashed(&p->mglist) &&
1335 (timer_pending(&p->timer) ?
1336 time_after(p->timer.expires, time) :
1337 try_to_del_timer_sync(&p->timer) >= 0)) {
1338 mod_timer(&p->timer, time);
1339 }
1340
1341 break;
1342 }
1343 }
1344
1345 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1346 struct net_bridge_port_group __rcu **pp;
1347
1348 for (pp = &mp->ports;
1349 (p = mlock_dereference(*pp, br)) != NULL;
1350 pp = &p->next) {
1351 if (p->port != port)
1352 continue;
1353
1354 rcu_assign_pointer(*pp, p->next);
1355 hlist_del_init(&p->mglist);
1356 del_timer(&p->timer);
1357 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1358 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1359
1360 if (!mp->ports && !mp->mglist && mp->timer_armed &&
1361 netif_running(br->dev))
1362 mod_timer(&mp->timer, jiffies);
1363 }
1364 goto out;
1365 }
1366
1367 now = jiffies;
1368 time = now + br->multicast_last_member_count *
1369 br->multicast_last_member_interval;
1370
1371 if (!port) {
1372 if (mp->mglist && mp->timer_armed &&
1373 (timer_pending(&mp->timer) ?
1374 time_after(mp->timer.expires, time) :
1375 try_to_del_timer_sync(&mp->timer) >= 0)) {
1376 mod_timer(&mp->timer, time);
1377 }
1378 }
1379 out:
1380 spin_unlock(&br->multicast_lock);
1381 }
1382
1383 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1384 struct net_bridge_port *port,
1385 __be32 group,
1386 __u16 vid)
1387 {
1388 struct br_ip br_group;
1389 struct bridge_mcast_query *query = port ? &port->ip4_query :
1390 &br->ip4_query;
1391
1392 if (ipv4_is_local_multicast(group))
1393 return;
1394
1395 br_group.u.ip4 = group;
1396 br_group.proto = htons(ETH_P_IP);
1397 br_group.vid = vid;
1398
1399 br_multicast_leave_group(br, port, &br_group, &br->ip4_querier, query);
1400 }
1401
1402 #if IS_ENABLED(CONFIG_IPV6)
1403 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1404 struct net_bridge_port *port,
1405 const struct in6_addr *group,
1406 __u16 vid)
1407 {
1408 struct br_ip br_group;
1409 struct bridge_mcast_query *query = port ? &port->ip6_query :
1410 &br->ip6_query;
1411
1412
1413 if (!ipv6_is_transient_multicast(group))
1414 return;
1415
1416 br_group.u.ip6 = *group;
1417 br_group.proto = htons(ETH_P_IPV6);
1418 br_group.vid = vid;
1419
1420 br_multicast_leave_group(br, port, &br_group, &br->ip6_querier, query);
1421 }
1422 #endif
1423
1424 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1425 struct net_bridge_port *port,
1426 struct sk_buff *skb)
1427 {
1428 struct sk_buff *skb2 = skb;
1429 const struct iphdr *iph;
1430 struct igmphdr *ih;
1431 unsigned int len;
1432 unsigned int offset;
1433 int err;
1434 u16 vid = 0;
1435
1436 /* We treat OOM as packet loss for now. */
1437 if (!pskb_may_pull(skb, sizeof(*iph)))
1438 return -EINVAL;
1439
1440 iph = ip_hdr(skb);
1441
1442 if (iph->ihl < 5 || iph->version != 4)
1443 return -EINVAL;
1444
1445 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1446 return -EINVAL;
1447
1448 iph = ip_hdr(skb);
1449
1450 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1451 return -EINVAL;
1452
1453 if (iph->protocol != IPPROTO_IGMP) {
1454 if (!ipv4_is_local_multicast(iph->daddr))
1455 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1456 return 0;
1457 }
1458
1459 len = ntohs(iph->tot_len);
1460 if (skb->len < len || len < ip_hdrlen(skb))
1461 return -EINVAL;
1462
1463 if (skb->len > len) {
1464 skb2 = skb_clone(skb, GFP_ATOMIC);
1465 if (!skb2)
1466 return -ENOMEM;
1467
1468 err = pskb_trim_rcsum(skb2, len);
1469 if (err)
1470 goto err_out;
1471 }
1472
1473 len -= ip_hdrlen(skb2);
1474 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1475 __skb_pull(skb2, offset);
1476 skb_reset_transport_header(skb2);
1477
1478 err = -EINVAL;
1479 if (!pskb_may_pull(skb2, sizeof(*ih)))
1480 goto out;
1481
1482 switch (skb2->ip_summed) {
1483 case CHECKSUM_COMPLETE:
1484 if (!csum_fold(skb2->csum))
1485 break;
1486 /* fall through */
1487 case CHECKSUM_NONE:
1488 skb2->csum = 0;
1489 if (skb_checksum_complete(skb2))
1490 goto out;
1491 }
1492
1493 err = 0;
1494
1495 br_vlan_get_tag(skb2, &vid);
1496 BR_INPUT_SKB_CB(skb)->igmp = 1;
1497 ih = igmp_hdr(skb2);
1498
1499 switch (ih->type) {
1500 case IGMP_HOST_MEMBERSHIP_REPORT:
1501 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1502 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1503 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1504 break;
1505 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1506 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1507 break;
1508 case IGMP_HOST_MEMBERSHIP_QUERY:
1509 err = br_ip4_multicast_query(br, port, skb2);
1510 break;
1511 case IGMP_HOST_LEAVE_MESSAGE:
1512 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1513 break;
1514 }
1515
1516 out:
1517 __skb_push(skb2, offset);
1518 err_out:
1519 if (skb2 != skb)
1520 kfree_skb(skb2);
1521 return err;
1522 }
1523
1524 #if IS_ENABLED(CONFIG_IPV6)
1525 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1526 struct net_bridge_port *port,
1527 struct sk_buff *skb)
1528 {
1529 struct sk_buff *skb2;
1530 const struct ipv6hdr *ip6h;
1531 u8 icmp6_type;
1532 u8 nexthdr;
1533 __be16 frag_off;
1534 unsigned int len;
1535 int offset;
1536 int err;
1537 u16 vid = 0;
1538
1539 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1540 return -EINVAL;
1541
1542 ip6h = ipv6_hdr(skb);
1543
1544 /*
1545 * We're interested in MLD messages only.
1546 * - Version is 6
1547 * - MLD has always Router Alert hop-by-hop option
1548 * - But we do not support jumbrograms.
1549 */
1550 if (ip6h->version != 6 ||
1551 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1552 ip6h->payload_len == 0)
1553 return 0;
1554
1555 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1556 if (skb->len < len)
1557 return -EINVAL;
1558
1559 nexthdr = ip6h->nexthdr;
1560 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1561
1562 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1563 return 0;
1564
1565 /* Okay, we found ICMPv6 header */
1566 skb2 = skb_clone(skb, GFP_ATOMIC);
1567 if (!skb2)
1568 return -ENOMEM;
1569
1570 err = -EINVAL;
1571 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1572 goto out;
1573
1574 len -= offset - skb_network_offset(skb2);
1575
1576 __skb_pull(skb2, offset);
1577 skb_reset_transport_header(skb2);
1578 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1579 skb_network_header_len(skb2));
1580
1581 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1582
1583 switch (icmp6_type) {
1584 case ICMPV6_MGM_QUERY:
1585 case ICMPV6_MGM_REPORT:
1586 case ICMPV6_MGM_REDUCTION:
1587 case ICMPV6_MLD2_REPORT:
1588 break;
1589 default:
1590 err = 0;
1591 goto out;
1592 }
1593
1594 /* Okay, we found MLD message. Check further. */
1595 if (skb2->len > len) {
1596 err = pskb_trim_rcsum(skb2, len);
1597 if (err)
1598 goto out;
1599 err = -EINVAL;
1600 }
1601
1602 ip6h = ipv6_hdr(skb2);
1603
1604 switch (skb2->ip_summed) {
1605 case CHECKSUM_COMPLETE:
1606 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1607 IPPROTO_ICMPV6, skb2->csum))
1608 break;
1609 /*FALLTHROUGH*/
1610 case CHECKSUM_NONE:
1611 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1612 &ip6h->daddr,
1613 skb2->len,
1614 IPPROTO_ICMPV6, 0));
1615 if (__skb_checksum_complete(skb2))
1616 goto out;
1617 }
1618
1619 err = 0;
1620
1621 br_vlan_get_tag(skb, &vid);
1622 BR_INPUT_SKB_CB(skb)->igmp = 1;
1623
1624 switch (icmp6_type) {
1625 case ICMPV6_MGM_REPORT:
1626 {
1627 struct mld_msg *mld;
1628 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1629 err = -EINVAL;
1630 goto out;
1631 }
1632 mld = (struct mld_msg *)skb_transport_header(skb2);
1633 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1634 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1635 break;
1636 }
1637 case ICMPV6_MLD2_REPORT:
1638 err = br_ip6_multicast_mld2_report(br, port, skb2);
1639 break;
1640 case ICMPV6_MGM_QUERY:
1641 err = br_ip6_multicast_query(br, port, skb2);
1642 break;
1643 case ICMPV6_MGM_REDUCTION:
1644 {
1645 struct mld_msg *mld;
1646 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1647 err = -EINVAL;
1648 goto out;
1649 }
1650 mld = (struct mld_msg *)skb_transport_header(skb2);
1651 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1652 }
1653 }
1654
1655 out:
1656 kfree_skb(skb2);
1657 return err;
1658 }
1659 #endif
1660
1661 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1662 struct sk_buff *skb)
1663 {
1664 BR_INPUT_SKB_CB(skb)->igmp = 0;
1665 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1666
1667 if (br->multicast_disabled)
1668 return 0;
1669
1670 switch (skb->protocol) {
1671 case htons(ETH_P_IP):
1672 return br_multicast_ipv4_rcv(br, port, skb);
1673 #if IS_ENABLED(CONFIG_IPV6)
1674 case htons(ETH_P_IPV6):
1675 return br_multicast_ipv6_rcv(br, port, skb);
1676 #endif
1677 }
1678
1679 return 0;
1680 }
1681
1682 static void br_multicast_query_expired(struct net_bridge *br,
1683 struct bridge_mcast_query *query)
1684 {
1685 spin_lock(&br->multicast_lock);
1686 if (query->startup_sent < br->multicast_startup_query_count)
1687 query->startup_sent++;
1688
1689 br_multicast_send_query(br, NULL, query);
1690 spin_unlock(&br->multicast_lock);
1691 }
1692
1693 static void br_ip4_multicast_query_expired(unsigned long data)
1694 {
1695 struct net_bridge *br = (void *)data;
1696
1697 br_multicast_query_expired(br, &br->ip4_query);
1698 }
1699
1700 #if IS_ENABLED(CONFIG_IPV6)
1701 static void br_ip6_multicast_query_expired(unsigned long data)
1702 {
1703 struct net_bridge *br = (void *)data;
1704
1705 br_multicast_query_expired(br, &br->ip6_query);
1706 }
1707 #endif
1708
1709 void br_multicast_init(struct net_bridge *br)
1710 {
1711 br->hash_elasticity = 4;
1712 br->hash_max = 512;
1713
1714 br->multicast_router = 1;
1715 br->multicast_querier = 0;
1716 br->multicast_query_use_ifaddr = 0;
1717 br->multicast_last_member_count = 2;
1718 br->multicast_startup_query_count = 2;
1719
1720 br->multicast_last_member_interval = HZ;
1721 br->multicast_query_response_interval = 10 * HZ;
1722 br->multicast_startup_query_interval = 125 * HZ / 4;
1723 br->multicast_query_interval = 125 * HZ;
1724 br->multicast_querier_interval = 255 * HZ;
1725 br->multicast_membership_interval = 260 * HZ;
1726
1727 br->ip4_querier.delay_time = 0;
1728 #if IS_ENABLED(CONFIG_IPV6)
1729 br->ip6_querier.delay_time = 0;
1730 #endif
1731
1732 spin_lock_init(&br->multicast_lock);
1733 setup_timer(&br->multicast_router_timer,
1734 br_multicast_local_router_expired, 0);
1735 setup_timer(&br->ip4_querier.timer, br_ip4_multicast_querier_expired,
1736 (unsigned long)br);
1737 setup_timer(&br->ip4_query.timer, br_ip4_multicast_query_expired,
1738 (unsigned long)br);
1739 #if IS_ENABLED(CONFIG_IPV6)
1740 setup_timer(&br->ip6_querier.timer, br_ip6_multicast_querier_expired,
1741 (unsigned long)br);
1742 setup_timer(&br->ip6_query.timer, br_ip6_multicast_query_expired,
1743 (unsigned long)br);
1744 #endif
1745 }
1746
1747 static void __br_multicast_open(struct net_bridge *br,
1748 struct bridge_mcast_query *query)
1749 {
1750 query->startup_sent = 0;
1751
1752 if (br->multicast_disabled)
1753 return;
1754
1755 mod_timer(&query->timer, jiffies);
1756 }
1757
1758 void br_multicast_open(struct net_bridge *br)
1759 {
1760 __br_multicast_open(br, &br->ip4_query);
1761 #if IS_ENABLED(CONFIG_IPV6)
1762 __br_multicast_open(br, &br->ip6_query);
1763 #endif
1764 }
1765
1766 void br_multicast_stop(struct net_bridge *br)
1767 {
1768 struct net_bridge_mdb_htable *mdb;
1769 struct net_bridge_mdb_entry *mp;
1770 struct hlist_node *n;
1771 u32 ver;
1772 int i;
1773
1774 del_timer_sync(&br->multicast_router_timer);
1775 del_timer_sync(&br->ip4_querier.timer);
1776 del_timer_sync(&br->ip4_query.timer);
1777 #if IS_ENABLED(CONFIG_IPV6)
1778 del_timer_sync(&br->ip6_querier.timer);
1779 del_timer_sync(&br->ip6_query.timer);
1780 #endif
1781
1782 spin_lock_bh(&br->multicast_lock);
1783 mdb = mlock_dereference(br->mdb, br);
1784 if (!mdb)
1785 goto out;
1786
1787 br->mdb = NULL;
1788
1789 ver = mdb->ver;
1790 for (i = 0; i < mdb->max; i++) {
1791 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1792 hlist[ver]) {
1793 del_timer(&mp->timer);
1794 mp->timer_armed = false;
1795 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1796 }
1797 }
1798
1799 if (mdb->old) {
1800 spin_unlock_bh(&br->multicast_lock);
1801 rcu_barrier_bh();
1802 spin_lock_bh(&br->multicast_lock);
1803 WARN_ON(mdb->old);
1804 }
1805
1806 mdb->old = mdb;
1807 call_rcu_bh(&mdb->rcu, br_mdb_free);
1808
1809 out:
1810 spin_unlock_bh(&br->multicast_lock);
1811 }
1812
1813 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1814 {
1815 int err = -ENOENT;
1816
1817 spin_lock_bh(&br->multicast_lock);
1818 if (!netif_running(br->dev))
1819 goto unlock;
1820
1821 switch (val) {
1822 case 0:
1823 case 2:
1824 del_timer(&br->multicast_router_timer);
1825 /* fall through */
1826 case 1:
1827 br->multicast_router = val;
1828 err = 0;
1829 break;
1830
1831 default:
1832 err = -EINVAL;
1833 break;
1834 }
1835
1836 unlock:
1837 spin_unlock_bh(&br->multicast_lock);
1838
1839 return err;
1840 }
1841
1842 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1843 {
1844 struct net_bridge *br = p->br;
1845 int err = -ENOENT;
1846
1847 spin_lock(&br->multicast_lock);
1848 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1849 goto unlock;
1850
1851 switch (val) {
1852 case 0:
1853 case 1:
1854 case 2:
1855 p->multicast_router = val;
1856 err = 0;
1857
1858 if (val < 2 && !hlist_unhashed(&p->rlist))
1859 hlist_del_init_rcu(&p->rlist);
1860
1861 if (val == 1)
1862 break;
1863
1864 del_timer(&p->multicast_router_timer);
1865
1866 if (val == 0)
1867 break;
1868
1869 br_multicast_add_router(br, p);
1870 break;
1871
1872 default:
1873 err = -EINVAL;
1874 break;
1875 }
1876
1877 unlock:
1878 spin_unlock(&br->multicast_lock);
1879
1880 return err;
1881 }
1882
1883 static void br_multicast_start_querier(struct net_bridge *br,
1884 struct bridge_mcast_query *query)
1885 {
1886 struct net_bridge_port *port;
1887
1888 __br_multicast_open(br, query);
1889
1890 list_for_each_entry(port, &br->port_list, list) {
1891 if (port->state == BR_STATE_DISABLED ||
1892 port->state == BR_STATE_BLOCKING)
1893 continue;
1894
1895 if (query == &br->ip4_query)
1896 br_multicast_enable(&port->ip4_query);
1897 #if IS_ENABLED(CONFIG_IPV6)
1898 else
1899 br_multicast_enable(&port->ip6_query);
1900 #endif
1901 }
1902 }
1903
1904 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1905 {
1906 int err = 0;
1907 struct net_bridge_mdb_htable *mdb;
1908
1909 spin_lock_bh(&br->multicast_lock);
1910 if (br->multicast_disabled == !val)
1911 goto unlock;
1912
1913 br->multicast_disabled = !val;
1914 if (br->multicast_disabled)
1915 goto unlock;
1916
1917 if (!netif_running(br->dev))
1918 goto unlock;
1919
1920 mdb = mlock_dereference(br->mdb, br);
1921 if (mdb) {
1922 if (mdb->old) {
1923 err = -EEXIST;
1924 rollback:
1925 br->multicast_disabled = !!val;
1926 goto unlock;
1927 }
1928
1929 err = br_mdb_rehash(&br->mdb, mdb->max,
1930 br->hash_elasticity);
1931 if (err)
1932 goto rollback;
1933 }
1934
1935 br_multicast_start_querier(br, &br->ip4_query);
1936 #if IS_ENABLED(CONFIG_IPV6)
1937 br_multicast_start_querier(br, &br->ip6_query);
1938 #endif
1939
1940 unlock:
1941 spin_unlock_bh(&br->multicast_lock);
1942
1943 return err;
1944 }
1945
1946 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1947 {
1948 unsigned long max_delay;
1949
1950 val = !!val;
1951
1952 spin_lock_bh(&br->multicast_lock);
1953 if (br->multicast_querier == val)
1954 goto unlock;
1955
1956 br->multicast_querier = val;
1957 if (!val)
1958 goto unlock;
1959
1960 max_delay = br->multicast_query_response_interval;
1961
1962 if (!timer_pending(&br->ip4_querier.timer))
1963 br->ip4_querier.delay_time = jiffies + max_delay;
1964
1965 br_multicast_start_querier(br, &br->ip4_query);
1966
1967 #if IS_ENABLED(CONFIG_IPV6)
1968 if (!timer_pending(&br->ip6_querier.timer))
1969 br->ip6_querier.delay_time = jiffies + max_delay;
1970
1971 br_multicast_start_querier(br, &br->ip6_query);
1972 #endif
1973
1974 unlock:
1975 spin_unlock_bh(&br->multicast_lock);
1976
1977 return 0;
1978 }
1979
1980 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1981 {
1982 int err = -ENOENT;
1983 u32 old;
1984 struct net_bridge_mdb_htable *mdb;
1985
1986 spin_lock(&br->multicast_lock);
1987 if (!netif_running(br->dev))
1988 goto unlock;
1989
1990 err = -EINVAL;
1991 if (!is_power_of_2(val))
1992 goto unlock;
1993
1994 mdb = mlock_dereference(br->mdb, br);
1995 if (mdb && val < mdb->size)
1996 goto unlock;
1997
1998 err = 0;
1999
2000 old = br->hash_max;
2001 br->hash_max = val;
2002
2003 if (mdb) {
2004 if (mdb->old) {
2005 err = -EEXIST;
2006 rollback:
2007 br->hash_max = old;
2008 goto unlock;
2009 }
2010
2011 err = br_mdb_rehash(&br->mdb, br->hash_max,
2012 br->hash_elasticity);
2013 if (err)
2014 goto rollback;
2015 }
2016
2017 unlock:
2018 spin_unlock(&br->multicast_lock);
2019
2020 return err;
2021 }
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