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13#include <linux/err.h>
14#include <linux/export.h>
15#include <linux/if_ether.h>
16#include <linux/igmp.h>
17#include <linux/jhash.h>
18#include <linux/kernel.h>
19#include <linux/log2.h>
20#include <linux/netdevice.h>
21#include <linux/netfilter_bridge.h>
22#include <linux/random.h>
23#include <linux/rculist.h>
24#include <linux/skbuff.h>
25#include <linux/slab.h>
26#include <linux/timer.h>
27#include <linux/inetdevice.h>
28#include <net/ip.h>
29#if IS_ENABLED(CONFIG_IPV6)
30#include <net/ipv6.h>
31#include <net/mld.h>
32#include <net/ip6_checksum.h>
33#include <net/addrconf.h>
34#endif
35
36#include "br_private.h"
37
38static void br_multicast_start_querier(struct net_bridge *br,
39 struct bridge_mcast_own_query *query);
40unsigned int br_mdb_rehash_seq;
41
42static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
43{
44 if (a->proto != b->proto)
45 return 0;
46 if (a->vid != b->vid)
47 return 0;
48 switch (a->proto) {
49 case htons(ETH_P_IP):
50 return a->u.ip4 == b->u.ip4;
51#if IS_ENABLED(CONFIG_IPV6)
52 case htons(ETH_P_IPV6):
53 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
54#endif
55 }
56 return 0;
57}
58
59static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
60 __u16 vid)
61{
62 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
63}
64
65#if IS_ENABLED(CONFIG_IPV6)
66static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
67 const struct in6_addr *ip,
68 __u16 vid)
69{
70 return jhash_2words(ipv6_addr_hash(ip), vid,
71 mdb->secret) & (mdb->max - 1);
72}
73#endif
74
75static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
76 struct br_ip *ip)
77{
78 switch (ip->proto) {
79 case htons(ETH_P_IP):
80 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
81#if IS_ENABLED(CONFIG_IPV6)
82 case htons(ETH_P_IPV6):
83 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
84#endif
85 }
86 return 0;
87}
88
89static struct net_bridge_mdb_entry *__br_mdb_ip_get(
90 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
91{
92 struct net_bridge_mdb_entry *mp;
93
94 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
95 if (br_ip_equal(&mp->addr, dst))
96 return mp;
97 }
98
99 return NULL;
100}
101
102struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
103 struct br_ip *dst)
104{
105 if (!mdb)
106 return NULL;
107
108 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
109}
110
111static struct net_bridge_mdb_entry *br_mdb_ip4_get(
112 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
113{
114 struct br_ip br_dst;
115
116 br_dst.u.ip4 = dst;
117 br_dst.proto = htons(ETH_P_IP);
118 br_dst.vid = vid;
119
120 return br_mdb_ip_get(mdb, &br_dst);
121}
122
123#if IS_ENABLED(CONFIG_IPV6)
124static struct net_bridge_mdb_entry *br_mdb_ip6_get(
125 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
126 __u16 vid)
127{
128 struct br_ip br_dst;
129
130 br_dst.u.ip6 = *dst;
131 br_dst.proto = htons(ETH_P_IPV6);
132 br_dst.vid = vid;
133
134 return br_mdb_ip_get(mdb, &br_dst);
135}
136#endif
137
138struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
139 struct sk_buff *skb, u16 vid)
140{
141 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
142 struct br_ip ip;
143
144 if (br->multicast_disabled)
145 return NULL;
146
147 if (BR_INPUT_SKB_CB(skb)->igmp)
148 return NULL;
149
150 ip.proto = skb->protocol;
151 ip.vid = vid;
152
153 switch (skb->protocol) {
154 case htons(ETH_P_IP):
155 ip.u.ip4 = ip_hdr(skb)->daddr;
156 break;
157#if IS_ENABLED(CONFIG_IPV6)
158 case htons(ETH_P_IPV6):
159 ip.u.ip6 = ipv6_hdr(skb)->daddr;
160 break;
161#endif
162 default:
163 return NULL;
164 }
165
166 return br_mdb_ip_get(mdb, &ip);
167}
168
169static void br_mdb_free(struct rcu_head *head)
170{
171 struct net_bridge_mdb_htable *mdb =
172 container_of(head, struct net_bridge_mdb_htable, rcu);
173 struct net_bridge_mdb_htable *old = mdb->old;
174
175 mdb->old = NULL;
176 kfree(old->mhash);
177 kfree(old);
178}
179
180static int br_mdb_copy(struct net_bridge_mdb_htable *new,
181 struct net_bridge_mdb_htable *old,
182 int elasticity)
183{
184 struct net_bridge_mdb_entry *mp;
185 int maxlen;
186 int len;
187 int i;
188
189 for (i = 0; i < old->max; i++)
190 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
191 hlist_add_head(&mp->hlist[new->ver],
192 &new->mhash[br_ip_hash(new, &mp->addr)]);
193
194 if (!elasticity)
195 return 0;
196
197 maxlen = 0;
198 for (i = 0; i < new->max; i++) {
199 len = 0;
200 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
201 len++;
202 if (len > maxlen)
203 maxlen = len;
204 }
205
206 return maxlen > elasticity ? -EINVAL : 0;
207}
208
209void br_multicast_free_pg(struct rcu_head *head)
210{
211 struct net_bridge_port_group *p =
212 container_of(head, struct net_bridge_port_group, rcu);
213
214 kfree(p);
215}
216
217static void br_multicast_free_group(struct rcu_head *head)
218{
219 struct net_bridge_mdb_entry *mp =
220 container_of(head, struct net_bridge_mdb_entry, rcu);
221
222 kfree(mp);
223}
224
225static void br_multicast_group_expired(unsigned long data)
226{
227 struct net_bridge_mdb_entry *mp = (void *)data;
228 struct net_bridge *br = mp->br;
229 struct net_bridge_mdb_htable *mdb;
230
231 spin_lock(&br->multicast_lock);
232 if (!netif_running(br->dev) || timer_pending(&mp->timer))
233 goto out;
234
235 mp->mglist = false;
236
237 if (mp->ports)
238 goto out;
239
240 mdb = mlock_dereference(br->mdb, br);
241
242 hlist_del_rcu(&mp->hlist[mdb->ver]);
243 mdb->size--;
244
245 call_rcu_bh(&mp->rcu, br_multicast_free_group);
246
247out:
248 spin_unlock(&br->multicast_lock);
249}
250
251static void br_multicast_del_pg(struct net_bridge *br,
252 struct net_bridge_port_group *pg)
253{
254 struct net_bridge_mdb_htable *mdb;
255 struct net_bridge_mdb_entry *mp;
256 struct net_bridge_port_group *p;
257 struct net_bridge_port_group __rcu **pp;
258
259 mdb = mlock_dereference(br->mdb, br);
260
261 mp = br_mdb_ip_get(mdb, &pg->addr);
262 if (WARN_ON(!mp))
263 return;
264
265 for (pp = &mp->ports;
266 (p = mlock_dereference(*pp, br)) != NULL;
267 pp = &p->next) {
268 if (p != pg)
269 continue;
270
271 rcu_assign_pointer(*pp, p->next);
272 hlist_del_init(&p->mglist);
273 del_timer(&p->timer);
274 call_rcu_bh(&p->rcu, br_multicast_free_pg);
275
276 if (!mp->ports && !mp->mglist &&
277 netif_running(br->dev))
278 mod_timer(&mp->timer, jiffies);
279
280 return;
281 }
282
283 WARN_ON(1);
284}
285
286static void br_multicast_port_group_expired(unsigned long data)
287{
288 struct net_bridge_port_group *pg = (void *)data;
289 struct net_bridge *br = pg->port->br;
290
291 spin_lock(&br->multicast_lock);
292 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
293 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
294 goto out;
295
296 br_multicast_del_pg(br, pg);
297
298out:
299 spin_unlock(&br->multicast_lock);
300}
301
302static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
303 int elasticity)
304{
305 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
306 struct net_bridge_mdb_htable *mdb;
307 int err;
308
309 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
310 if (!mdb)
311 return -ENOMEM;
312
313 mdb->max = max;
314 mdb->old = old;
315
316 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
317 if (!mdb->mhash) {
318 kfree(mdb);
319 return -ENOMEM;
320 }
321
322 mdb->size = old ? old->size : 0;
323 mdb->ver = old ? old->ver ^ 1 : 0;
324
325 if (!old || elasticity)
326 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
327 else
328 mdb->secret = old->secret;
329
330 if (!old)
331 goto out;
332
333 err = br_mdb_copy(mdb, old, elasticity);
334 if (err) {
335 kfree(mdb->mhash);
336 kfree(mdb);
337 return err;
338 }
339
340 br_mdb_rehash_seq++;
341 call_rcu_bh(&mdb->rcu, br_mdb_free);
342
343out:
344 rcu_assign_pointer(*mdbp, mdb);
345
346 return 0;
347}
348
349static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
350 __be32 group)
351{
352 struct sk_buff *skb;
353 struct igmphdr *ih;
354 struct ethhdr *eth;
355 struct iphdr *iph;
356
357 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
358 sizeof(*ih) + 4);
359 if (!skb)
360 goto out;
361
362 skb->protocol = htons(ETH_P_IP);
363
364 skb_reset_mac_header(skb);
365 eth = eth_hdr(skb);
366
367 ether_addr_copy(eth->h_source, br->dev->dev_addr);
368 eth->h_dest[0] = 1;
369 eth->h_dest[1] = 0;
370 eth->h_dest[2] = 0x5e;
371 eth->h_dest[3] = 0;
372 eth->h_dest[4] = 0;
373 eth->h_dest[5] = 1;
374 eth->h_proto = htons(ETH_P_IP);
375 skb_put(skb, sizeof(*eth));
376
377 skb_set_network_header(skb, skb->len);
378 iph = ip_hdr(skb);
379
380 iph->version = 4;
381 iph->ihl = 6;
382 iph->tos = 0xc0;
383 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
384 iph->id = 0;
385 iph->frag_off = htons(IP_DF);
386 iph->ttl = 1;
387 iph->protocol = IPPROTO_IGMP;
388 iph->saddr = br->multicast_query_use_ifaddr ?
389 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
390 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
391 ((u8 *)&iph[1])[0] = IPOPT_RA;
392 ((u8 *)&iph[1])[1] = 4;
393 ((u8 *)&iph[1])[2] = 0;
394 ((u8 *)&iph[1])[3] = 0;
395 ip_send_check(iph);
396 skb_put(skb, 24);
397
398 skb_set_transport_header(skb, skb->len);
399 ih = igmp_hdr(skb);
400 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
401 ih->code = (group ? br->multicast_last_member_interval :
402 br->multicast_query_response_interval) /
403 (HZ / IGMP_TIMER_SCALE);
404 ih->group = group;
405 ih->csum = 0;
406 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
407 skb_put(skb, sizeof(*ih));
408
409 __skb_pull(skb, sizeof(*eth));
410
411out:
412 return skb;
413}
414
415#if IS_ENABLED(CONFIG_IPV6)
416static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
417 const struct in6_addr *group)
418{
419 struct sk_buff *skb;
420 struct ipv6hdr *ip6h;
421 struct mld_msg *mldq;
422 struct ethhdr *eth;
423 u8 *hopopt;
424 unsigned long interval;
425
426 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
427 8 + sizeof(*mldq));
428 if (!skb)
429 goto out;
430
431 skb->protocol = htons(ETH_P_IPV6);
432
433
434 skb_reset_mac_header(skb);
435 eth = eth_hdr(skb);
436
437 ether_addr_copy(eth->h_source, br->dev->dev_addr);
438 eth->h_proto = htons(ETH_P_IPV6);
439 skb_put(skb, sizeof(*eth));
440
441
442 skb_set_network_header(skb, skb->len);
443 ip6h = ipv6_hdr(skb);
444
445 *(__force __be32 *)ip6h = htonl(0x60000000);
446 ip6h->payload_len = htons(8 + sizeof(*mldq));
447 ip6h->nexthdr = IPPROTO_HOPOPTS;
448 ip6h->hop_limit = 1;
449 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
450 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
451 &ip6h->saddr)) {
452 kfree_skb(skb);
453 return NULL;
454 }
455 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
456
457 hopopt = (u8 *)(ip6h + 1);
458 hopopt[0] = IPPROTO_ICMPV6;
459 hopopt[1] = 0;
460 hopopt[2] = IPV6_TLV_ROUTERALERT;
461 hopopt[3] = 2;
462 hopopt[4] = 0;
463 hopopt[5] = 0;
464 hopopt[6] = IPV6_TLV_PAD1;
465 hopopt[7] = IPV6_TLV_PAD1;
466
467 skb_put(skb, sizeof(*ip6h) + 8);
468
469
470 skb_set_transport_header(skb, skb->len);
471 mldq = (struct mld_msg *) icmp6_hdr(skb);
472
473 interval = ipv6_addr_any(group) ?
474 br->multicast_query_response_interval :
475 br->multicast_last_member_interval;
476
477 mldq->mld_type = ICMPV6_MGM_QUERY;
478 mldq->mld_code = 0;
479 mldq->mld_cksum = 0;
480 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
481 mldq->mld_reserved = 0;
482 mldq->mld_mca = *group;
483
484
485 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
486 sizeof(*mldq), IPPROTO_ICMPV6,
487 csum_partial(mldq,
488 sizeof(*mldq), 0));
489 skb_put(skb, sizeof(*mldq));
490
491 __skb_pull(skb, sizeof(*eth));
492
493out:
494 return skb;
495}
496#endif
497
498static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
499 struct br_ip *addr)
500{
501 switch (addr->proto) {
502 case htons(ETH_P_IP):
503 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
504#if IS_ENABLED(CONFIG_IPV6)
505 case htons(ETH_P_IPV6):
506 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
507#endif
508 }
509 return NULL;
510}
511
512static struct net_bridge_mdb_entry *br_multicast_get_group(
513 struct net_bridge *br, struct net_bridge_port *port,
514 struct br_ip *group, int hash)
515{
516 struct net_bridge_mdb_htable *mdb;
517 struct net_bridge_mdb_entry *mp;
518 unsigned int count = 0;
519 unsigned int max;
520 int elasticity;
521 int err;
522
523 mdb = rcu_dereference_protected(br->mdb, 1);
524 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
525 count++;
526 if (unlikely(br_ip_equal(group, &mp->addr)))
527 return mp;
528 }
529
530 elasticity = 0;
531 max = mdb->max;
532
533 if (unlikely(count > br->hash_elasticity && count)) {
534 if (net_ratelimit())
535 br_info(br, "Multicast hash table "
536 "chain limit reached: %s\n",
537 port ? port->dev->name : br->dev->name);
538
539 elasticity = br->hash_elasticity;
540 }
541
542 if (mdb->size >= max) {
543 max *= 2;
544 if (unlikely(max > br->hash_max)) {
545 br_warn(br, "Multicast hash table maximum of %d "
546 "reached, disabling snooping: %s\n",
547 br->hash_max,
548 port ? port->dev->name : br->dev->name);
549 err = -E2BIG;
550disable:
551 br->multicast_disabled = 1;
552 goto err;
553 }
554 }
555
556 if (max > mdb->max || elasticity) {
557 if (mdb->old) {
558 if (net_ratelimit())
559 br_info(br, "Multicast hash table "
560 "on fire: %s\n",
561 port ? port->dev->name : br->dev->name);
562 err = -EEXIST;
563 goto err;
564 }
565
566 err = br_mdb_rehash(&br->mdb, max, elasticity);
567 if (err) {
568 br_warn(br, "Cannot rehash multicast "
569 "hash table, disabling snooping: %s, %d, %d\n",
570 port ? port->dev->name : br->dev->name,
571 mdb->size, err);
572 goto disable;
573 }
574
575 err = -EAGAIN;
576 goto err;
577 }
578
579 return NULL;
580
581err:
582 mp = ERR_PTR(err);
583 return mp;
584}
585
586struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
587 struct net_bridge_port *port, struct br_ip *group)
588{
589 struct net_bridge_mdb_htable *mdb;
590 struct net_bridge_mdb_entry *mp;
591 int hash;
592 int err;
593
594 mdb = rcu_dereference_protected(br->mdb, 1);
595 if (!mdb) {
596 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
597 if (err)
598 return ERR_PTR(err);
599 goto rehash;
600 }
601
602 hash = br_ip_hash(mdb, group);
603 mp = br_multicast_get_group(br, port, group, hash);
604 switch (PTR_ERR(mp)) {
605 case 0:
606 break;
607
608 case -EAGAIN:
609rehash:
610 mdb = rcu_dereference_protected(br->mdb, 1);
611 hash = br_ip_hash(mdb, group);
612 break;
613
614 default:
615 goto out;
616 }
617
618 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
619 if (unlikely(!mp))
620 return ERR_PTR(-ENOMEM);
621
622 mp->br = br;
623 mp->addr = *group;
624 setup_timer(&mp->timer, br_multicast_group_expired,
625 (unsigned long)mp);
626
627 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
628 mdb->size++;
629
630out:
631 return mp;
632}
633
634struct net_bridge_port_group *br_multicast_new_port_group(
635 struct net_bridge_port *port,
636 struct br_ip *group,
637 struct net_bridge_port_group __rcu *next,
638 unsigned char state)
639{
640 struct net_bridge_port_group *p;
641
642 p = kzalloc(sizeof(*p), GFP_ATOMIC);
643 if (unlikely(!p))
644 return NULL;
645
646 p->addr = *group;
647 p->port = port;
648 p->state = state;
649 rcu_assign_pointer(p->next, next);
650 hlist_add_head(&p->mglist, &port->mglist);
651 setup_timer(&p->timer, br_multicast_port_group_expired,
652 (unsigned long)p);
653 return p;
654}
655
656static int br_multicast_add_group(struct net_bridge *br,
657 struct net_bridge_port *port,
658 struct br_ip *group)
659{
660 struct net_bridge_mdb_entry *mp;
661 struct net_bridge_port_group *p;
662 struct net_bridge_port_group __rcu **pp;
663 unsigned long now = jiffies;
664 int err;
665
666 spin_lock(&br->multicast_lock);
667 if (!netif_running(br->dev) ||
668 (port && port->state == BR_STATE_DISABLED))
669 goto out;
670
671 mp = br_multicast_new_group(br, port, group);
672 err = PTR_ERR(mp);
673 if (IS_ERR(mp))
674 goto err;
675
676 if (!port) {
677 mp->mglist = true;
678 mod_timer(&mp->timer, now + br->multicast_membership_interval);
679 goto out;
680 }
681
682 for (pp = &mp->ports;
683 (p = mlock_dereference(*pp, br)) != NULL;
684 pp = &p->next) {
685 if (p->port == port)
686 goto found;
687 if ((unsigned long)p->port < (unsigned long)port)
688 break;
689 }
690
691 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
692 if (unlikely(!p))
693 goto err;
694 rcu_assign_pointer(*pp, p);
695 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
696
697found:
698 mod_timer(&p->timer, now + br->multicast_membership_interval);
699out:
700 err = 0;
701
702err:
703 spin_unlock(&br->multicast_lock);
704 return err;
705}
706
707static int br_ip4_multicast_add_group(struct net_bridge *br,
708 struct net_bridge_port *port,
709 __be32 group,
710 __u16 vid)
711{
712 struct br_ip br_group;
713
714 if (ipv4_is_local_multicast(group))
715 return 0;
716
717 br_group.u.ip4 = group;
718 br_group.proto = htons(ETH_P_IP);
719 br_group.vid = vid;
720
721 return br_multicast_add_group(br, port, &br_group);
722}
723
724#if IS_ENABLED(CONFIG_IPV6)
725static int br_ip6_multicast_add_group(struct net_bridge *br,
726 struct net_bridge_port *port,
727 const struct in6_addr *group,
728 __u16 vid)
729{
730 struct br_ip br_group;
731
732 if (ipv6_addr_is_ll_all_nodes(group))
733 return 0;
734
735 br_group.u.ip6 = *group;
736 br_group.proto = htons(ETH_P_IPV6);
737 br_group.vid = vid;
738
739 return br_multicast_add_group(br, port, &br_group);
740}
741#endif
742
743static void br_multicast_router_expired(unsigned long data)
744{
745 struct net_bridge_port *port = (void *)data;
746 struct net_bridge *br = port->br;
747
748 spin_lock(&br->multicast_lock);
749 if (port->multicast_router != 1 ||
750 timer_pending(&port->multicast_router_timer) ||
751 hlist_unhashed(&port->rlist))
752 goto out;
753
754 hlist_del_init_rcu(&port->rlist);
755
756out:
757 spin_unlock(&br->multicast_lock);
758}
759
760static void br_multicast_local_router_expired(unsigned long data)
761{
762}
763
764static void br_multicast_querier_expired(struct net_bridge *br,
765 struct bridge_mcast_own_query *query)
766{
767 spin_lock(&br->multicast_lock);
768 if (!netif_running(br->dev) || br->multicast_disabled)
769 goto out;
770
771 br_multicast_start_querier(br, query);
772
773out:
774 spin_unlock(&br->multicast_lock);
775}
776
777static void br_ip4_multicast_querier_expired(unsigned long data)
778{
779 struct net_bridge *br = (void *)data;
780
781 br_multicast_querier_expired(br, &br->ip4_own_query);
782}
783
784#if IS_ENABLED(CONFIG_IPV6)
785static void br_ip6_multicast_querier_expired(unsigned long data)
786{
787 struct net_bridge *br = (void *)data;
788
789 br_multicast_querier_expired(br, &br->ip6_own_query);
790}
791#endif
792
793static void br_multicast_select_own_querier(struct net_bridge *br,
794 struct br_ip *ip,
795 struct sk_buff *skb)
796{
797 if (ip->proto == htons(ETH_P_IP))
798 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
799#if IS_ENABLED(CONFIG_IPV6)
800 else
801 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
802#endif
803}
804
805static void __br_multicast_send_query(struct net_bridge *br,
806 struct net_bridge_port *port,
807 struct br_ip *ip)
808{
809 struct sk_buff *skb;
810
811 skb = br_multicast_alloc_query(br, ip);
812 if (!skb)
813 return;
814
815 if (port) {
816 __skb_push(skb, sizeof(struct ethhdr));
817 skb->dev = port->dev;
818 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
819 dev_queue_xmit);
820 } else {
821 br_multicast_select_own_querier(br, ip, skb);
822 netif_rx(skb);
823 }
824}
825
826static void br_multicast_send_query(struct net_bridge *br,
827 struct net_bridge_port *port,
828 struct bridge_mcast_own_query *own_query)
829{
830 unsigned long time;
831 struct br_ip br_group;
832 struct bridge_mcast_other_query *other_query = NULL;
833
834 if (!netif_running(br->dev) || br->multicast_disabled ||
835 !br->multicast_querier)
836 return;
837
838 memset(&br_group.u, 0, sizeof(br_group.u));
839
840 if (port ? (own_query == &port->ip4_own_query) :
841 (own_query == &br->ip4_own_query)) {
842 other_query = &br->ip4_other_query;
843 br_group.proto = htons(ETH_P_IP);
844#if IS_ENABLED(CONFIG_IPV6)
845 } else {
846 other_query = &br->ip6_other_query;
847 br_group.proto = htons(ETH_P_IPV6);
848#endif
849 }
850
851 if (!other_query || timer_pending(&other_query->timer))
852 return;
853
854 __br_multicast_send_query(br, port, &br_group);
855
856 time = jiffies;
857 time += own_query->startup_sent < br->multicast_startup_query_count ?
858 br->multicast_startup_query_interval :
859 br->multicast_query_interval;
860 mod_timer(&own_query->timer, time);
861}
862
863static void
864br_multicast_port_query_expired(struct net_bridge_port *port,
865 struct bridge_mcast_own_query *query)
866{
867 struct net_bridge *br = port->br;
868
869 spin_lock(&br->multicast_lock);
870 if (port->state == BR_STATE_DISABLED ||
871 port->state == BR_STATE_BLOCKING)
872 goto out;
873
874 if (query->startup_sent < br->multicast_startup_query_count)
875 query->startup_sent++;
876
877 br_multicast_send_query(port->br, port, query);
878
879out:
880 spin_unlock(&br->multicast_lock);
881}
882
883static void br_ip4_multicast_port_query_expired(unsigned long data)
884{
885 struct net_bridge_port *port = (void *)data;
886
887 br_multicast_port_query_expired(port, &port->ip4_own_query);
888}
889
890#if IS_ENABLED(CONFIG_IPV6)
891static void br_ip6_multicast_port_query_expired(unsigned long data)
892{
893 struct net_bridge_port *port = (void *)data;
894
895 br_multicast_port_query_expired(port, &port->ip6_own_query);
896}
897#endif
898
899void br_multicast_add_port(struct net_bridge_port *port)
900{
901 port->multicast_router = 1;
902
903 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
904 (unsigned long)port);
905 setup_timer(&port->ip4_own_query.timer,
906 br_ip4_multicast_port_query_expired, (unsigned long)port);
907#if IS_ENABLED(CONFIG_IPV6)
908 setup_timer(&port->ip6_own_query.timer,
909 br_ip6_multicast_port_query_expired, (unsigned long)port);
910#endif
911}
912
913void br_multicast_del_port(struct net_bridge_port *port)
914{
915 del_timer_sync(&port->multicast_router_timer);
916}
917
918static void br_multicast_enable(struct bridge_mcast_own_query *query)
919{
920 query->startup_sent = 0;
921
922 if (try_to_del_timer_sync(&query->timer) >= 0 ||
923 del_timer(&query->timer))
924 mod_timer(&query->timer, jiffies);
925}
926
927void br_multicast_enable_port(struct net_bridge_port *port)
928{
929 struct net_bridge *br = port->br;
930
931 spin_lock(&br->multicast_lock);
932 if (br->multicast_disabled || !netif_running(br->dev))
933 goto out;
934
935 br_multicast_enable(&port->ip4_own_query);
936#if IS_ENABLED(CONFIG_IPV6)
937 br_multicast_enable(&port->ip6_own_query);
938#endif
939
940out:
941 spin_unlock(&br->multicast_lock);
942}
943
944void br_multicast_disable_port(struct net_bridge_port *port)
945{
946 struct net_bridge *br = port->br;
947 struct net_bridge_port_group *pg;
948 struct hlist_node *n;
949
950 spin_lock(&br->multicast_lock);
951 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
952 br_multicast_del_pg(br, pg);
953
954 if (!hlist_unhashed(&port->rlist))
955 hlist_del_init_rcu(&port->rlist);
956 del_timer(&port->multicast_router_timer);
957 del_timer(&port->ip4_own_query.timer);
958#if IS_ENABLED(CONFIG_IPV6)
959 del_timer(&port->ip6_own_query.timer);
960#endif
961 spin_unlock(&br->multicast_lock);
962}
963
964static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
965 struct net_bridge_port *port,
966 struct sk_buff *skb,
967 u16 vid)
968{
969 struct igmpv3_report *ih;
970 struct igmpv3_grec *grec;
971 int i;
972 int len;
973 int num;
974 int type;
975 int err = 0;
976 __be32 group;
977
978 if (!pskb_may_pull(skb, sizeof(*ih)))
979 return -EINVAL;
980
981 ih = igmpv3_report_hdr(skb);
982 num = ntohs(ih->ngrec);
983 len = sizeof(*ih);
984
985 for (i = 0; i < num; i++) {
986 len += sizeof(*grec);
987 if (!pskb_may_pull(skb, len))
988 return -EINVAL;
989
990 grec = (void *)(skb->data + len - sizeof(*grec));
991 group = grec->grec_mca;
992 type = grec->grec_type;
993
994 len += ntohs(grec->grec_nsrcs) * 4;
995 if (!pskb_may_pull(skb, len))
996 return -EINVAL;
997
998
999 switch (type) {
1000 case IGMPV3_MODE_IS_INCLUDE:
1001 case IGMPV3_MODE_IS_EXCLUDE:
1002 case IGMPV3_CHANGE_TO_INCLUDE:
1003 case IGMPV3_CHANGE_TO_EXCLUDE:
1004 case IGMPV3_ALLOW_NEW_SOURCES:
1005 case IGMPV3_BLOCK_OLD_SOURCES:
1006 break;
1007
1008 default:
1009 continue;
1010 }
1011
1012 err = br_ip4_multicast_add_group(br, port, group, vid);
1013 if (err)
1014 break;
1015 }
1016
1017 return err;
1018}
1019
1020#if IS_ENABLED(CONFIG_IPV6)
1021static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1022 struct net_bridge_port *port,
1023 struct sk_buff *skb,
1024 u16 vid)
1025{
1026 struct icmp6hdr *icmp6h;
1027 struct mld2_grec *grec;
1028 int i;
1029 int len;
1030 int num;
1031 int err = 0;
1032
1033 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1034 return -EINVAL;
1035
1036 icmp6h = icmp6_hdr(skb);
1037 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1038 len = sizeof(*icmp6h);
1039
1040 for (i = 0; i < num; i++) {
1041 __be16 *nsrcs, _nsrcs;
1042
1043 nsrcs = skb_header_pointer(skb,
1044 len + offsetof(struct mld2_grec,
1045 grec_nsrcs),
1046 sizeof(_nsrcs), &_nsrcs);
1047 if (!nsrcs)
1048 return -EINVAL;
1049
1050 if (!pskb_may_pull(skb,
1051 len + sizeof(*grec) +
1052 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1053 return -EINVAL;
1054
1055 grec = (struct mld2_grec *)(skb->data + len);
1056 len += sizeof(*grec) +
1057 sizeof(struct in6_addr) * ntohs(*nsrcs);
1058
1059
1060 switch (grec->grec_type) {
1061 case MLD2_MODE_IS_INCLUDE:
1062 case MLD2_MODE_IS_EXCLUDE:
1063 case MLD2_CHANGE_TO_INCLUDE:
1064 case MLD2_CHANGE_TO_EXCLUDE:
1065 case MLD2_ALLOW_NEW_SOURCES:
1066 case MLD2_BLOCK_OLD_SOURCES:
1067 break;
1068
1069 default:
1070 continue;
1071 }
1072
1073 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1074 vid);
1075 if (!err)
1076 break;
1077 }
1078
1079 return err;
1080}
1081#endif
1082
1083static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1084 struct net_bridge_port *port,
1085 __be32 saddr)
1086{
1087 if (!timer_pending(&br->ip4_own_query.timer) &&
1088 !timer_pending(&br->ip4_other_query.timer))
1089 goto update;
1090
1091 if (!br->ip4_querier.addr.u.ip4)
1092 goto update;
1093
1094 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1095 goto update;
1096
1097 return false;
1098
1099update:
1100 br->ip4_querier.addr.u.ip4 = saddr;
1101
1102
1103 rcu_assign_pointer(br->ip4_querier.port, port);
1104
1105 return true;
1106}
1107
1108#if IS_ENABLED(CONFIG_IPV6)
1109static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1110 struct net_bridge_port *port,
1111 struct in6_addr *saddr)
1112{
1113 if (!timer_pending(&br->ip6_own_query.timer) &&
1114 !timer_pending(&br->ip6_other_query.timer))
1115 goto update;
1116
1117 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1118 goto update;
1119
1120 return false;
1121
1122update:
1123 br->ip6_querier.addr.u.ip6 = *saddr;
1124
1125
1126 rcu_assign_pointer(br->ip6_querier.port, port);
1127
1128 return true;
1129}
1130#endif
1131
1132static bool br_multicast_select_querier(struct net_bridge *br,
1133 struct net_bridge_port *port,
1134 struct br_ip *saddr)
1135{
1136 switch (saddr->proto) {
1137 case htons(ETH_P_IP):
1138 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1139#if IS_ENABLED(CONFIG_IPV6)
1140 case htons(ETH_P_IPV6):
1141 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1142#endif
1143 }
1144
1145 return false;
1146}
1147
1148static void
1149br_multicast_update_query_timer(struct net_bridge *br,
1150 struct bridge_mcast_other_query *query,
1151 unsigned long max_delay)
1152{
1153 if (!timer_pending(&query->timer))
1154 query->delay_time = jiffies + max_delay;
1155
1156 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1157}
1158
1159
1160
1161
1162
1163
1164static void br_multicast_add_router(struct net_bridge *br,
1165 struct net_bridge_port *port)
1166{
1167 struct net_bridge_port *p;
1168 struct hlist_node *slot = NULL;
1169
1170 hlist_for_each_entry(p, &br->router_list, rlist) {
1171 if ((unsigned long) port >= (unsigned long) p)
1172 break;
1173 slot = &p->rlist;
1174 }
1175
1176 if (slot)
1177 hlist_add_behind_rcu(&port->rlist, slot);
1178 else
1179 hlist_add_head_rcu(&port->rlist, &br->router_list);
1180}
1181
1182static void br_multicast_mark_router(struct net_bridge *br,
1183 struct net_bridge_port *port)
1184{
1185 unsigned long now = jiffies;
1186
1187 if (!port) {
1188 if (br->multicast_router == 1)
1189 mod_timer(&br->multicast_router_timer,
1190 now + br->multicast_querier_interval);
1191 return;
1192 }
1193
1194 if (port->multicast_router != 1)
1195 return;
1196
1197 if (!hlist_unhashed(&port->rlist))
1198 goto timer;
1199
1200 br_multicast_add_router(br, port);
1201
1202timer:
1203 mod_timer(&port->multicast_router_timer,
1204 now + br->multicast_querier_interval);
1205}
1206
1207static void br_multicast_query_received(struct net_bridge *br,
1208 struct net_bridge_port *port,
1209 struct bridge_mcast_other_query *query,
1210 struct br_ip *saddr,
1211 unsigned long max_delay)
1212{
1213 if (!br_multicast_select_querier(br, port, saddr))
1214 return;
1215
1216 br_multicast_update_query_timer(br, query, max_delay);
1217 br_multicast_mark_router(br, port);
1218}
1219
1220static int br_ip4_multicast_query(struct net_bridge *br,
1221 struct net_bridge_port *port,
1222 struct sk_buff *skb,
1223 u16 vid)
1224{
1225 const struct iphdr *iph = ip_hdr(skb);
1226 struct igmphdr *ih = igmp_hdr(skb);
1227 struct net_bridge_mdb_entry *mp;
1228 struct igmpv3_query *ih3;
1229 struct net_bridge_port_group *p;
1230 struct net_bridge_port_group __rcu **pp;
1231 struct br_ip saddr;
1232 unsigned long max_delay;
1233 unsigned long now = jiffies;
1234 __be32 group;
1235 int err = 0;
1236
1237 spin_lock(&br->multicast_lock);
1238 if (!netif_running(br->dev) ||
1239 (port && port->state == BR_STATE_DISABLED))
1240 goto out;
1241
1242 group = ih->group;
1243
1244 if (skb->len == sizeof(*ih)) {
1245 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1246
1247 if (!max_delay) {
1248 max_delay = 10 * HZ;
1249 group = 0;
1250 }
1251 } else {
1252 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1253 err = -EINVAL;
1254 goto out;
1255 }
1256
1257 ih3 = igmpv3_query_hdr(skb);
1258 if (ih3->nsrcs)
1259 goto out;
1260
1261 max_delay = ih3->code ?
1262 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1263 }
1264
1265
1266
1267
1268 if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) {
1269 err = -EINVAL;
1270 goto out;
1271 }
1272
1273 if (!group) {
1274 saddr.proto = htons(ETH_P_IP);
1275 saddr.u.ip4 = iph->saddr;
1276
1277 br_multicast_query_received(br, port, &br->ip4_other_query,
1278 &saddr, max_delay);
1279 goto out;
1280 }
1281
1282 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1283 if (!mp)
1284 goto out;
1285
1286 max_delay *= br->multicast_last_member_count;
1287
1288 if (mp->mglist &&
1289 (timer_pending(&mp->timer) ?
1290 time_after(mp->timer.expires, now + max_delay) :
1291 try_to_del_timer_sync(&mp->timer) >= 0))
1292 mod_timer(&mp->timer, now + max_delay);
1293
1294 for (pp = &mp->ports;
1295 (p = mlock_dereference(*pp, br)) != NULL;
1296 pp = &p->next) {
1297 if (timer_pending(&p->timer) ?
1298 time_after(p->timer.expires, now + max_delay) :
1299 try_to_del_timer_sync(&p->timer) >= 0)
1300 mod_timer(&p->timer, now + max_delay);
1301 }
1302
1303out:
1304 spin_unlock(&br->multicast_lock);
1305 return err;
1306}
1307
1308#if IS_ENABLED(CONFIG_IPV6)
1309static int br_ip6_multicast_query(struct net_bridge *br,
1310 struct net_bridge_port *port,
1311 struct sk_buff *skb,
1312 u16 vid)
1313{
1314 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1315 struct mld_msg *mld;
1316 struct net_bridge_mdb_entry *mp;
1317 struct mld2_query *mld2q;
1318 struct net_bridge_port_group *p;
1319 struct net_bridge_port_group __rcu **pp;
1320 struct br_ip saddr;
1321 unsigned long max_delay;
1322 unsigned long now = jiffies;
1323 const struct in6_addr *group = NULL;
1324 bool is_general_query;
1325 int err = 0;
1326
1327 spin_lock(&br->multicast_lock);
1328 if (!netif_running(br->dev) ||
1329 (port && port->state == BR_STATE_DISABLED))
1330 goto out;
1331
1332
1333 if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1334 err = -EINVAL;
1335 goto out;
1336 }
1337
1338 if (skb->len == sizeof(*mld)) {
1339 if (!pskb_may_pull(skb, sizeof(*mld))) {
1340 err = -EINVAL;
1341 goto out;
1342 }
1343 mld = (struct mld_msg *) icmp6_hdr(skb);
1344 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1345 if (max_delay)
1346 group = &mld->mld_mca;
1347 } else {
1348 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1349 err = -EINVAL;
1350 goto out;
1351 }
1352 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1353 if (!mld2q->mld2q_nsrcs)
1354 group = &mld2q->mld2q_mca;
1355
1356 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1357 }
1358
1359 is_general_query = group && ipv6_addr_any(group);
1360
1361
1362
1363
1364 if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) {
1365 err = -EINVAL;
1366 goto out;
1367 }
1368
1369 if (is_general_query) {
1370 saddr.proto = htons(ETH_P_IPV6);
1371 saddr.u.ip6 = ip6h->saddr;
1372
1373 br_multicast_query_received(br, port, &br->ip6_other_query,
1374 &saddr, max_delay);
1375 goto out;
1376 } else if (!group) {
1377 goto out;
1378 }
1379
1380 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1381 if (!mp)
1382 goto out;
1383
1384 max_delay *= br->multicast_last_member_count;
1385 if (mp->mglist &&
1386 (timer_pending(&mp->timer) ?
1387 time_after(mp->timer.expires, now + max_delay) :
1388 try_to_del_timer_sync(&mp->timer) >= 0))
1389 mod_timer(&mp->timer, now + max_delay);
1390
1391 for (pp = &mp->ports;
1392 (p = mlock_dereference(*pp, br)) != NULL;
1393 pp = &p->next) {
1394 if (timer_pending(&p->timer) ?
1395 time_after(p->timer.expires, now + max_delay) :
1396 try_to_del_timer_sync(&p->timer) >= 0)
1397 mod_timer(&p->timer, now + max_delay);
1398 }
1399
1400out:
1401 spin_unlock(&br->multicast_lock);
1402 return err;
1403}
1404#endif
1405
1406static void
1407br_multicast_leave_group(struct net_bridge *br,
1408 struct net_bridge_port *port,
1409 struct br_ip *group,
1410 struct bridge_mcast_other_query *other_query,
1411 struct bridge_mcast_own_query *own_query)
1412{
1413 struct net_bridge_mdb_htable *mdb;
1414 struct net_bridge_mdb_entry *mp;
1415 struct net_bridge_port_group *p;
1416 unsigned long now;
1417 unsigned long time;
1418
1419 spin_lock(&br->multicast_lock);
1420 if (!netif_running(br->dev) ||
1421 (port && port->state == BR_STATE_DISABLED) ||
1422 timer_pending(&other_query->timer))
1423 goto out;
1424
1425 mdb = mlock_dereference(br->mdb, br);
1426 mp = br_mdb_ip_get(mdb, group);
1427 if (!mp)
1428 goto out;
1429
1430 if (br->multicast_querier) {
1431 __br_multicast_send_query(br, port, &mp->addr);
1432
1433 time = jiffies + br->multicast_last_member_count *
1434 br->multicast_last_member_interval;
1435
1436 mod_timer(&own_query->timer, time);
1437
1438 for (p = mlock_dereference(mp->ports, br);
1439 p != NULL;
1440 p = mlock_dereference(p->next, br)) {
1441 if (p->port != port)
1442 continue;
1443
1444 if (!hlist_unhashed(&p->mglist) &&
1445 (timer_pending(&p->timer) ?
1446 time_after(p->timer.expires, time) :
1447 try_to_del_timer_sync(&p->timer) >= 0)) {
1448 mod_timer(&p->timer, time);
1449 }
1450
1451 break;
1452 }
1453 }
1454
1455 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1456 struct net_bridge_port_group __rcu **pp;
1457
1458 for (pp = &mp->ports;
1459 (p = mlock_dereference(*pp, br)) != NULL;
1460 pp = &p->next) {
1461 if (p->port != port)
1462 continue;
1463
1464 rcu_assign_pointer(*pp, p->next);
1465 hlist_del_init(&p->mglist);
1466 del_timer(&p->timer);
1467 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1468 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1469
1470 if (!mp->ports && !mp->mglist &&
1471 netif_running(br->dev))
1472 mod_timer(&mp->timer, jiffies);
1473 }
1474 goto out;
1475 }
1476
1477 now = jiffies;
1478 time = now + br->multicast_last_member_count *
1479 br->multicast_last_member_interval;
1480
1481 if (!port) {
1482 if (mp->mglist &&
1483 (timer_pending(&mp->timer) ?
1484 time_after(mp->timer.expires, time) :
1485 try_to_del_timer_sync(&mp->timer) >= 0)) {
1486 mod_timer(&mp->timer, time);
1487 }
1488
1489 goto out;
1490 }
1491
1492 for (p = mlock_dereference(mp->ports, br);
1493 p != NULL;
1494 p = mlock_dereference(p->next, br)) {
1495 if (p->port != port)
1496 continue;
1497
1498 if (!hlist_unhashed(&p->mglist) &&
1499 (timer_pending(&p->timer) ?
1500 time_after(p->timer.expires, time) :
1501 try_to_del_timer_sync(&p->timer) >= 0)) {
1502 mod_timer(&p->timer, time);
1503 }
1504
1505 break;
1506 }
1507out:
1508 spin_unlock(&br->multicast_lock);
1509}
1510
1511static void br_ip4_multicast_leave_group(struct net_bridge *br,
1512 struct net_bridge_port *port,
1513 __be32 group,
1514 __u16 vid)
1515{
1516 struct br_ip br_group;
1517 struct bridge_mcast_own_query *own_query;
1518
1519 if (ipv4_is_local_multicast(group))
1520 return;
1521
1522 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1523
1524 br_group.u.ip4 = group;
1525 br_group.proto = htons(ETH_P_IP);
1526 br_group.vid = vid;
1527
1528 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1529 own_query);
1530}
1531
1532#if IS_ENABLED(CONFIG_IPV6)
1533static void br_ip6_multicast_leave_group(struct net_bridge *br,
1534 struct net_bridge_port *port,
1535 const struct in6_addr *group,
1536 __u16 vid)
1537{
1538 struct br_ip br_group;
1539 struct bridge_mcast_own_query *own_query;
1540
1541 if (ipv6_addr_is_ll_all_nodes(group))
1542 return;
1543
1544 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1545
1546 br_group.u.ip6 = *group;
1547 br_group.proto = htons(ETH_P_IPV6);
1548 br_group.vid = vid;
1549
1550 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1551 own_query);
1552}
1553#endif
1554
1555static int br_multicast_ipv4_rcv(struct net_bridge *br,
1556 struct net_bridge_port *port,
1557 struct sk_buff *skb,
1558 u16 vid)
1559{
1560 struct sk_buff *skb2 = skb;
1561 const struct iphdr *iph;
1562 struct igmphdr *ih;
1563 unsigned int len;
1564 unsigned int offset;
1565 int err;
1566
1567
1568 if (!pskb_may_pull(skb, sizeof(*iph)))
1569 return -EINVAL;
1570
1571 iph = ip_hdr(skb);
1572
1573 if (iph->ihl < 5 || iph->version != 4)
1574 return -EINVAL;
1575
1576 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1577 return -EINVAL;
1578
1579 iph = ip_hdr(skb);
1580
1581 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1582 return -EINVAL;
1583
1584 if (iph->protocol != IPPROTO_IGMP) {
1585 if (!ipv4_is_local_multicast(iph->daddr))
1586 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1587 return 0;
1588 }
1589
1590 len = ntohs(iph->tot_len);
1591 if (skb->len < len || len < ip_hdrlen(skb))
1592 return -EINVAL;
1593
1594 if (skb->len > len) {
1595 skb2 = skb_clone(skb, GFP_ATOMIC);
1596 if (!skb2)
1597 return -ENOMEM;
1598
1599 err = pskb_trim_rcsum(skb2, len);
1600 if (err)
1601 goto err_out;
1602 }
1603
1604 len -= ip_hdrlen(skb2);
1605 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1606 __skb_pull(skb2, offset);
1607 skb_reset_transport_header(skb2);
1608
1609 err = -EINVAL;
1610 if (!pskb_may_pull(skb2, sizeof(*ih)))
1611 goto out;
1612
1613 switch (skb2->ip_summed) {
1614 case CHECKSUM_COMPLETE:
1615 if (!csum_fold(skb2->csum))
1616 break;
1617
1618 case CHECKSUM_NONE:
1619 skb2->csum = 0;
1620 if (skb_checksum_complete(skb2))
1621 goto out;
1622 }
1623
1624 err = 0;
1625
1626 BR_INPUT_SKB_CB(skb)->igmp = 1;
1627 ih = igmp_hdr(skb2);
1628
1629 switch (ih->type) {
1630 case IGMP_HOST_MEMBERSHIP_REPORT:
1631 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1632 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1633 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1634 break;
1635 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1636 err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
1637 break;
1638 case IGMP_HOST_MEMBERSHIP_QUERY:
1639 err = br_ip4_multicast_query(br, port, skb2, vid);
1640 break;
1641 case IGMP_HOST_LEAVE_MESSAGE:
1642 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1643 break;
1644 }
1645
1646out:
1647 __skb_push(skb2, offset);
1648err_out:
1649 if (skb2 != skb)
1650 kfree_skb(skb2);
1651 return err;
1652}
1653
1654#if IS_ENABLED(CONFIG_IPV6)
1655static int br_multicast_ipv6_rcv(struct net_bridge *br,
1656 struct net_bridge_port *port,
1657 struct sk_buff *skb,
1658 u16 vid)
1659{
1660 struct sk_buff *skb2;
1661 const struct ipv6hdr *ip6h;
1662 u8 icmp6_type;
1663 u8 nexthdr;
1664 __be16 frag_off;
1665 unsigned int len;
1666 int offset;
1667 int err;
1668
1669 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1670 return -EINVAL;
1671
1672 ip6h = ipv6_hdr(skb);
1673
1674
1675
1676
1677
1678
1679
1680 if (ip6h->version != 6)
1681 return 0;
1682
1683
1684 if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
1685 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1686
1687 if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
1688 ip6h->payload_len == 0)
1689 return 0;
1690
1691 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1692 if (skb->len < len)
1693 return -EINVAL;
1694
1695 nexthdr = ip6h->nexthdr;
1696 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1697
1698 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1699 return 0;
1700
1701
1702 skb2 = skb_clone(skb, GFP_ATOMIC);
1703 if (!skb2)
1704 return -ENOMEM;
1705
1706 err = -EINVAL;
1707 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1708 goto out;
1709
1710 len -= offset - skb_network_offset(skb2);
1711
1712 __skb_pull(skb2, offset);
1713 skb_reset_transport_header(skb2);
1714 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1715 skb_network_header_len(skb2));
1716
1717 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1718
1719 switch (icmp6_type) {
1720 case ICMPV6_MGM_QUERY:
1721 case ICMPV6_MGM_REPORT:
1722 case ICMPV6_MGM_REDUCTION:
1723 case ICMPV6_MLD2_REPORT:
1724 break;
1725 default:
1726 err = 0;
1727 goto out;
1728 }
1729
1730
1731 if (skb2->len > len) {
1732 err = pskb_trim_rcsum(skb2, len);
1733 if (err)
1734 goto out;
1735 err = -EINVAL;
1736 }
1737
1738 ip6h = ipv6_hdr(skb2);
1739
1740 switch (skb2->ip_summed) {
1741 case CHECKSUM_COMPLETE:
1742 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1743 IPPROTO_ICMPV6, skb2->csum))
1744 break;
1745
1746 case CHECKSUM_NONE:
1747 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1748 &ip6h->daddr,
1749 skb2->len,
1750 IPPROTO_ICMPV6, 0));
1751 if (__skb_checksum_complete(skb2))
1752 goto out;
1753 }
1754
1755 err = 0;
1756
1757 BR_INPUT_SKB_CB(skb)->igmp = 1;
1758
1759 switch (icmp6_type) {
1760 case ICMPV6_MGM_REPORT:
1761 {
1762 struct mld_msg *mld;
1763 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1764 err = -EINVAL;
1765 goto out;
1766 }
1767 mld = (struct mld_msg *)skb_transport_header(skb2);
1768 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1769 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1770 break;
1771 }
1772 case ICMPV6_MLD2_REPORT:
1773 err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
1774 break;
1775 case ICMPV6_MGM_QUERY:
1776 err = br_ip6_multicast_query(br, port, skb2, vid);
1777 break;
1778 case ICMPV6_MGM_REDUCTION:
1779 {
1780 struct mld_msg *mld;
1781 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1782 err = -EINVAL;
1783 goto out;
1784 }
1785 mld = (struct mld_msg *)skb_transport_header(skb2);
1786 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1787 }
1788 }
1789
1790out:
1791 kfree_skb(skb2);
1792 return err;
1793}
1794#endif
1795
1796int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1797 struct sk_buff *skb, u16 vid)
1798{
1799 BR_INPUT_SKB_CB(skb)->igmp = 0;
1800 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1801
1802 if (br->multicast_disabled)
1803 return 0;
1804
1805 switch (skb->protocol) {
1806 case htons(ETH_P_IP):
1807 return br_multicast_ipv4_rcv(br, port, skb, vid);
1808#if IS_ENABLED(CONFIG_IPV6)
1809 case htons(ETH_P_IPV6):
1810 return br_multicast_ipv6_rcv(br, port, skb, vid);
1811#endif
1812 }
1813
1814 return 0;
1815}
1816
1817static void br_multicast_query_expired(struct net_bridge *br,
1818 struct bridge_mcast_own_query *query,
1819 struct bridge_mcast_querier *querier)
1820{
1821 spin_lock(&br->multicast_lock);
1822 if (query->startup_sent < br->multicast_startup_query_count)
1823 query->startup_sent++;
1824
1825 rcu_assign_pointer(querier, NULL);
1826 br_multicast_send_query(br, NULL, query);
1827 spin_unlock(&br->multicast_lock);
1828}
1829
1830static void br_ip4_multicast_query_expired(unsigned long data)
1831{
1832 struct net_bridge *br = (void *)data;
1833
1834 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1835}
1836
1837#if IS_ENABLED(CONFIG_IPV6)
1838static void br_ip6_multicast_query_expired(unsigned long data)
1839{
1840 struct net_bridge *br = (void *)data;
1841
1842 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1843}
1844#endif
1845
1846void br_multicast_init(struct net_bridge *br)
1847{
1848 br->hash_elasticity = 4;
1849 br->hash_max = 512;
1850
1851 br->multicast_router = 1;
1852 br->multicast_querier = 0;
1853 br->multicast_query_use_ifaddr = 0;
1854 br->multicast_last_member_count = 2;
1855 br->multicast_startup_query_count = 2;
1856
1857 br->multicast_last_member_interval = HZ;
1858 br->multicast_query_response_interval = 10 * HZ;
1859 br->multicast_startup_query_interval = 125 * HZ / 4;
1860 br->multicast_query_interval = 125 * HZ;
1861 br->multicast_querier_interval = 255 * HZ;
1862 br->multicast_membership_interval = 260 * HZ;
1863
1864 br->ip4_other_query.delay_time = 0;
1865 br->ip4_querier.port = NULL;
1866#if IS_ENABLED(CONFIG_IPV6)
1867 br->ip6_other_query.delay_time = 0;
1868 br->ip6_querier.port = NULL;
1869#endif
1870
1871 spin_lock_init(&br->multicast_lock);
1872 setup_timer(&br->multicast_router_timer,
1873 br_multicast_local_router_expired, 0);
1874 setup_timer(&br->ip4_other_query.timer,
1875 br_ip4_multicast_querier_expired, (unsigned long)br);
1876 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1877 (unsigned long)br);
1878#if IS_ENABLED(CONFIG_IPV6)
1879 setup_timer(&br->ip6_other_query.timer,
1880 br_ip6_multicast_querier_expired, (unsigned long)br);
1881 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1882 (unsigned long)br);
1883#endif
1884}
1885
1886static void __br_multicast_open(struct net_bridge *br,
1887 struct bridge_mcast_own_query *query)
1888{
1889 query->startup_sent = 0;
1890
1891 if (br->multicast_disabled)
1892 return;
1893
1894 mod_timer(&query->timer, jiffies);
1895}
1896
1897void br_multicast_open(struct net_bridge *br)
1898{
1899 __br_multicast_open(br, &br->ip4_own_query);
1900#if IS_ENABLED(CONFIG_IPV6)
1901 __br_multicast_open(br, &br->ip6_own_query);
1902#endif
1903}
1904
1905void br_multicast_stop(struct net_bridge *br)
1906{
1907 struct net_bridge_mdb_htable *mdb;
1908 struct net_bridge_mdb_entry *mp;
1909 struct hlist_node *n;
1910 u32 ver;
1911 int i;
1912
1913 del_timer_sync(&br->multicast_router_timer);
1914 del_timer_sync(&br->ip4_other_query.timer);
1915 del_timer_sync(&br->ip4_own_query.timer);
1916#if IS_ENABLED(CONFIG_IPV6)
1917 del_timer_sync(&br->ip6_other_query.timer);
1918 del_timer_sync(&br->ip6_own_query.timer);
1919#endif
1920
1921 spin_lock_bh(&br->multicast_lock);
1922 mdb = mlock_dereference(br->mdb, br);
1923 if (!mdb)
1924 goto out;
1925
1926 br->mdb = NULL;
1927
1928 ver = mdb->ver;
1929 for (i = 0; i < mdb->max; i++) {
1930 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1931 hlist[ver]) {
1932 del_timer(&mp->timer);
1933 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1934 }
1935 }
1936
1937 if (mdb->old) {
1938 spin_unlock_bh(&br->multicast_lock);
1939 rcu_barrier_bh();
1940 spin_lock_bh(&br->multicast_lock);
1941 WARN_ON(mdb->old);
1942 }
1943
1944 mdb->old = mdb;
1945 call_rcu_bh(&mdb->rcu, br_mdb_free);
1946
1947out:
1948 spin_unlock_bh(&br->multicast_lock);
1949}
1950
1951int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1952{
1953 int err = -ENOENT;
1954
1955 spin_lock_bh(&br->multicast_lock);
1956 if (!netif_running(br->dev))
1957 goto unlock;
1958
1959 switch (val) {
1960 case 0:
1961 case 2:
1962 del_timer(&br->multicast_router_timer);
1963
1964 case 1:
1965 br->multicast_router = val;
1966 err = 0;
1967 break;
1968
1969 default:
1970 err = -EINVAL;
1971 break;
1972 }
1973
1974unlock:
1975 spin_unlock_bh(&br->multicast_lock);
1976
1977 return err;
1978}
1979
1980int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1981{
1982 struct net_bridge *br = p->br;
1983 int err = -ENOENT;
1984
1985 spin_lock(&br->multicast_lock);
1986 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1987 goto unlock;
1988
1989 switch (val) {
1990 case 0:
1991 case 1:
1992 case 2:
1993 p->multicast_router = val;
1994 err = 0;
1995
1996 if (val < 2 && !hlist_unhashed(&p->rlist))
1997 hlist_del_init_rcu(&p->rlist);
1998
1999 if (val == 1)
2000 break;
2001
2002 del_timer(&p->multicast_router_timer);
2003
2004 if (val == 0)
2005 break;
2006
2007 br_multicast_add_router(br, p);
2008 break;
2009
2010 default:
2011 err = -EINVAL;
2012 break;
2013 }
2014
2015unlock:
2016 spin_unlock(&br->multicast_lock);
2017
2018 return err;
2019}
2020
2021static void br_multicast_start_querier(struct net_bridge *br,
2022 struct bridge_mcast_own_query *query)
2023{
2024 struct net_bridge_port *port;
2025
2026 __br_multicast_open(br, query);
2027
2028 list_for_each_entry(port, &br->port_list, list) {
2029 if (port->state == BR_STATE_DISABLED ||
2030 port->state == BR_STATE_BLOCKING)
2031 continue;
2032
2033 if (query == &br->ip4_own_query)
2034 br_multicast_enable(&port->ip4_own_query);
2035#if IS_ENABLED(CONFIG_IPV6)
2036 else
2037 br_multicast_enable(&port->ip6_own_query);
2038#endif
2039 }
2040}
2041
2042int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2043{
2044 int err = 0;
2045 struct net_bridge_mdb_htable *mdb;
2046
2047 spin_lock_bh(&br->multicast_lock);
2048 if (br->multicast_disabled == !val)
2049 goto unlock;
2050
2051 br->multicast_disabled = !val;
2052 if (br->multicast_disabled)
2053 goto unlock;
2054
2055 if (!netif_running(br->dev))
2056 goto unlock;
2057
2058 mdb = mlock_dereference(br->mdb, br);
2059 if (mdb) {
2060 if (mdb->old) {
2061 err = -EEXIST;
2062rollback:
2063 br->multicast_disabled = !!val;
2064 goto unlock;
2065 }
2066
2067 err = br_mdb_rehash(&br->mdb, mdb->max,
2068 br->hash_elasticity);
2069 if (err)
2070 goto rollback;
2071 }
2072
2073 br_multicast_start_querier(br, &br->ip4_own_query);
2074#if IS_ENABLED(CONFIG_IPV6)
2075 br_multicast_start_querier(br, &br->ip6_own_query);
2076#endif
2077
2078unlock:
2079 spin_unlock_bh(&br->multicast_lock);
2080
2081 return err;
2082}
2083
2084int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2085{
2086 unsigned long max_delay;
2087
2088 val = !!val;
2089
2090 spin_lock_bh(&br->multicast_lock);
2091 if (br->multicast_querier == val)
2092 goto unlock;
2093
2094 br->multicast_querier = val;
2095 if (!val)
2096 goto unlock;
2097
2098 max_delay = br->multicast_query_response_interval;
2099
2100 if (!timer_pending(&br->ip4_other_query.timer))
2101 br->ip4_other_query.delay_time = jiffies + max_delay;
2102
2103 br_multicast_start_querier(br, &br->ip4_own_query);
2104
2105#if IS_ENABLED(CONFIG_IPV6)
2106 if (!timer_pending(&br->ip6_other_query.timer))
2107 br->ip6_other_query.delay_time = jiffies + max_delay;
2108
2109 br_multicast_start_querier(br, &br->ip6_own_query);
2110#endif
2111
2112unlock:
2113 spin_unlock_bh(&br->multicast_lock);
2114
2115 return 0;
2116}
2117
2118int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2119{
2120 int err = -ENOENT;
2121 u32 old;
2122 struct net_bridge_mdb_htable *mdb;
2123
2124 spin_lock_bh(&br->multicast_lock);
2125 if (!netif_running(br->dev))
2126 goto unlock;
2127
2128 err = -EINVAL;
2129 if (!is_power_of_2(val))
2130 goto unlock;
2131
2132 mdb = mlock_dereference(br->mdb, br);
2133 if (mdb && val < mdb->size)
2134 goto unlock;
2135
2136 err = 0;
2137
2138 old = br->hash_max;
2139 br->hash_max = val;
2140
2141 if (mdb) {
2142 if (mdb->old) {
2143 err = -EEXIST;
2144rollback:
2145 br->hash_max = old;
2146 goto unlock;
2147 }
2148
2149 err = br_mdb_rehash(&br->mdb, br->hash_max,
2150 br->hash_elasticity);
2151 if (err)
2152 goto rollback;
2153 }
2154
2155unlock:
2156 spin_unlock_bh(&br->multicast_lock);
2157
2158 return err;
2159}
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178int br_multicast_list_adjacent(struct net_device *dev,
2179 struct list_head *br_ip_list)
2180{
2181 struct net_bridge *br;
2182 struct net_bridge_port *port;
2183 struct net_bridge_port_group *group;
2184 struct br_ip_list *entry;
2185 int count = 0;
2186
2187 rcu_read_lock();
2188 if (!br_ip_list || !br_port_exists(dev))
2189 goto unlock;
2190
2191 port = br_port_get_rcu(dev);
2192 if (!port || !port->br)
2193 goto unlock;
2194
2195 br = port->br;
2196
2197 list_for_each_entry_rcu(port, &br->port_list, list) {
2198 if (!port->dev || port->dev == dev)
2199 continue;
2200
2201 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2202 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2203 if (!entry)
2204 goto unlock;
2205
2206 entry->addr = group->addr;
2207 list_add(&entry->list, br_ip_list);
2208 count++;
2209 }
2210 }
2211
2212unlock:
2213 rcu_read_unlock();
2214 return count;
2215}
2216EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2228{
2229 struct net_bridge *br;
2230 struct net_bridge_port *port;
2231 struct ethhdr eth;
2232 bool ret = false;
2233
2234 rcu_read_lock();
2235 if (!br_port_exists(dev))
2236 goto unlock;
2237
2238 port = br_port_get_rcu(dev);
2239 if (!port || !port->br)
2240 goto unlock;
2241
2242 br = port->br;
2243
2244 memset(ð, 0, sizeof(eth));
2245 eth.h_proto = htons(proto);
2246
2247 ret = br_multicast_querier_exists(br, ð);
2248
2249unlock:
2250 rcu_read_unlock();
2251 return ret;
2252}
2253EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2265{
2266 struct net_bridge *br;
2267 struct net_bridge_port *port;
2268 bool ret = false;
2269
2270 rcu_read_lock();
2271 if (!br_port_exists(dev))
2272 goto unlock;
2273
2274 port = br_port_get_rcu(dev);
2275 if (!port || !port->br)
2276 goto unlock;
2277
2278 br = port->br;
2279
2280 switch (proto) {
2281 case ETH_P_IP:
2282 if (!timer_pending(&br->ip4_other_query.timer) ||
2283 rcu_dereference(br->ip4_querier.port) == port)
2284 goto unlock;
2285 break;
2286#if IS_ENABLED(CONFIG_IPV6)
2287 case ETH_P_IPV6:
2288 if (!timer_pending(&br->ip6_other_query.timer) ||
2289 rcu_dereference(br->ip6_querier.port) == port)
2290 goto unlock;
2291 break;
2292#endif
2293 default:
2294 goto unlock;
2295 }
2296
2297 ret = true;
2298unlock:
2299 rcu_read_unlock();
2300 return ret;
2301}
2302EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2303
