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net: ipv6: mld: get rid of MLDV2_MRC and simplify calculation
[deliverable/linux.git] / net / bridge / br_multicast.c
1 /*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13 #include <linux/err.h>
14 #include <linux/if_ether.h>
15 #include <linux/igmp.h>
16 #include <linux/jhash.h>
17 #include <linux/kernel.h>
18 #include <linux/log2.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter_bridge.h>
21 #include <linux/random.h>
22 #include <linux/rculist.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
26 #include <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 unsigned int br_mdb_rehash_seq;
38
39 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
40 {
41 if (a->proto != b->proto)
42 return 0;
43 if (a->vid != b->vid)
44 return 0;
45 switch (a->proto) {
46 case htons(ETH_P_IP):
47 return a->u.ip4 == b->u.ip4;
48 #if IS_ENABLED(CONFIG_IPV6)
49 case htons(ETH_P_IPV6):
50 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
51 #endif
52 }
53 return 0;
54 }
55
56 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
57 __u16 vid)
58 {
59 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
60 }
61
62 #if IS_ENABLED(CONFIG_IPV6)
63 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
64 const struct in6_addr *ip,
65 __u16 vid)
66 {
67 return jhash_2words(ipv6_addr_hash(ip), vid,
68 mdb->secret) & (mdb->max - 1);
69 }
70 #endif
71
72 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
73 struct br_ip *ip)
74 {
75 switch (ip->proto) {
76 case htons(ETH_P_IP):
77 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
78 #if IS_ENABLED(CONFIG_IPV6)
79 case htons(ETH_P_IPV6):
80 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
81 #endif
82 }
83 return 0;
84 }
85
86 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
87 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
88 {
89 struct net_bridge_mdb_entry *mp;
90
91 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
92 if (br_ip_equal(&mp->addr, dst))
93 return mp;
94 }
95
96 return NULL;
97 }
98
99 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
100 struct br_ip *dst)
101 {
102 if (!mdb)
103 return NULL;
104
105 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
106 }
107
108 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
109 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
110 {
111 struct br_ip br_dst;
112
113 br_dst.u.ip4 = dst;
114 br_dst.proto = htons(ETH_P_IP);
115 br_dst.vid = vid;
116
117 return br_mdb_ip_get(mdb, &br_dst);
118 }
119
120 #if IS_ENABLED(CONFIG_IPV6)
121 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
122 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
123 __u16 vid)
124 {
125 struct br_ip br_dst;
126
127 br_dst.u.ip6 = *dst;
128 br_dst.proto = htons(ETH_P_IPV6);
129 br_dst.vid = vid;
130
131 return br_mdb_ip_get(mdb, &br_dst);
132 }
133 #endif
134
135 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
136 struct sk_buff *skb, u16 vid)
137 {
138 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
139 struct br_ip ip;
140
141 if (br->multicast_disabled)
142 return NULL;
143
144 if (BR_INPUT_SKB_CB(skb)->igmp)
145 return NULL;
146
147 ip.proto = skb->protocol;
148 ip.vid = vid;
149
150 switch (skb->protocol) {
151 case htons(ETH_P_IP):
152 ip.u.ip4 = ip_hdr(skb)->daddr;
153 break;
154 #if IS_ENABLED(CONFIG_IPV6)
155 case htons(ETH_P_IPV6):
156 ip.u.ip6 = ipv6_hdr(skb)->daddr;
157 break;
158 #endif
159 default:
160 return NULL;
161 }
162
163 return br_mdb_ip_get(mdb, &ip);
164 }
165
166 static void br_mdb_free(struct rcu_head *head)
167 {
168 struct net_bridge_mdb_htable *mdb =
169 container_of(head, struct net_bridge_mdb_htable, rcu);
170 struct net_bridge_mdb_htable *old = mdb->old;
171
172 mdb->old = NULL;
173 kfree(old->mhash);
174 kfree(old);
175 }
176
177 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
178 struct net_bridge_mdb_htable *old,
179 int elasticity)
180 {
181 struct net_bridge_mdb_entry *mp;
182 int maxlen;
183 int len;
184 int i;
185
186 for (i = 0; i < old->max; i++)
187 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
188 hlist_add_head(&mp->hlist[new->ver],
189 &new->mhash[br_ip_hash(new, &mp->addr)]);
190
191 if (!elasticity)
192 return 0;
193
194 maxlen = 0;
195 for (i = 0; i < new->max; i++) {
196 len = 0;
197 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
198 len++;
199 if (len > maxlen)
200 maxlen = len;
201 }
202
203 return maxlen > elasticity ? -EINVAL : 0;
204 }
205
206 void br_multicast_free_pg(struct rcu_head *head)
207 {
208 struct net_bridge_port_group *p =
209 container_of(head, struct net_bridge_port_group, rcu);
210
211 kfree(p);
212 }
213
214 static void br_multicast_free_group(struct rcu_head *head)
215 {
216 struct net_bridge_mdb_entry *mp =
217 container_of(head, struct net_bridge_mdb_entry, rcu);
218
219 kfree(mp);
220 }
221
222 static void br_multicast_group_expired(unsigned long data)
223 {
224 struct net_bridge_mdb_entry *mp = (void *)data;
225 struct net_bridge *br = mp->br;
226 struct net_bridge_mdb_htable *mdb;
227
228 spin_lock(&br->multicast_lock);
229 if (!netif_running(br->dev) || timer_pending(&mp->timer))
230 goto out;
231
232 mp->mglist = false;
233
234 if (mp->ports)
235 goto out;
236
237 mdb = mlock_dereference(br->mdb, br);
238
239 hlist_del_rcu(&mp->hlist[mdb->ver]);
240 mdb->size--;
241
242 call_rcu_bh(&mp->rcu, br_multicast_free_group);
243
244 out:
245 spin_unlock(&br->multicast_lock);
246 }
247
248 static void br_multicast_del_pg(struct net_bridge *br,
249 struct net_bridge_port_group *pg)
250 {
251 struct net_bridge_mdb_htable *mdb;
252 struct net_bridge_mdb_entry *mp;
253 struct net_bridge_port_group *p;
254 struct net_bridge_port_group __rcu **pp;
255
256 mdb = mlock_dereference(br->mdb, br);
257
258 mp = br_mdb_ip_get(mdb, &pg->addr);
259 if (WARN_ON(!mp))
260 return;
261
262 for (pp = &mp->ports;
263 (p = mlock_dereference(*pp, br)) != NULL;
264 pp = &p->next) {
265 if (p != pg)
266 continue;
267
268 rcu_assign_pointer(*pp, p->next);
269 hlist_del_init(&p->mglist);
270 del_timer(&p->timer);
271 call_rcu_bh(&p->rcu, br_multicast_free_pg);
272
273 if (!mp->ports && !mp->mglist && mp->timer_armed &&
274 netif_running(br->dev))
275 mod_timer(&mp->timer, jiffies);
276
277 return;
278 }
279
280 WARN_ON(1);
281 }
282
283 static void br_multicast_port_group_expired(unsigned long data)
284 {
285 struct net_bridge_port_group *pg = (void *)data;
286 struct net_bridge *br = pg->port->br;
287
288 spin_lock(&br->multicast_lock);
289 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
290 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
291 goto out;
292
293 br_multicast_del_pg(br, pg);
294
295 out:
296 spin_unlock(&br->multicast_lock);
297 }
298
299 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
300 int elasticity)
301 {
302 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
303 struct net_bridge_mdb_htable *mdb;
304 int err;
305
306 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
307 if (!mdb)
308 return -ENOMEM;
309
310 mdb->max = max;
311 mdb->old = old;
312
313 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
314 if (!mdb->mhash) {
315 kfree(mdb);
316 return -ENOMEM;
317 }
318
319 mdb->size = old ? old->size : 0;
320 mdb->ver = old ? old->ver ^ 1 : 0;
321
322 if (!old || elasticity)
323 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
324 else
325 mdb->secret = old->secret;
326
327 if (!old)
328 goto out;
329
330 err = br_mdb_copy(mdb, old, elasticity);
331 if (err) {
332 kfree(mdb->mhash);
333 kfree(mdb);
334 return err;
335 }
336
337 br_mdb_rehash_seq++;
338 call_rcu_bh(&mdb->rcu, br_mdb_free);
339
340 out:
341 rcu_assign_pointer(*mdbp, mdb);
342
343 return 0;
344 }
345
346 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
347 __be32 group)
348 {
349 struct sk_buff *skb;
350 struct igmphdr *ih;
351 struct ethhdr *eth;
352 struct iphdr *iph;
353
354 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
355 sizeof(*ih) + 4);
356 if (!skb)
357 goto out;
358
359 skb->protocol = htons(ETH_P_IP);
360
361 skb_reset_mac_header(skb);
362 eth = eth_hdr(skb);
363
364 memcpy(eth->h_source, br->dev->dev_addr, 6);
365 eth->h_dest[0] = 1;
366 eth->h_dest[1] = 0;
367 eth->h_dest[2] = 0x5e;
368 eth->h_dest[3] = 0;
369 eth->h_dest[4] = 0;
370 eth->h_dest[5] = 1;
371 eth->h_proto = htons(ETH_P_IP);
372 skb_put(skb, sizeof(*eth));
373
374 skb_set_network_header(skb, skb->len);
375 iph = ip_hdr(skb);
376
377 iph->version = 4;
378 iph->ihl = 6;
379 iph->tos = 0xc0;
380 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
381 iph->id = 0;
382 iph->frag_off = htons(IP_DF);
383 iph->ttl = 1;
384 iph->protocol = IPPROTO_IGMP;
385 iph->saddr = br->multicast_query_use_ifaddr ?
386 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
387 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
388 ((u8 *)&iph[1])[0] = IPOPT_RA;
389 ((u8 *)&iph[1])[1] = 4;
390 ((u8 *)&iph[1])[2] = 0;
391 ((u8 *)&iph[1])[3] = 0;
392 ip_send_check(iph);
393 skb_put(skb, 24);
394
395 skb_set_transport_header(skb, skb->len);
396 ih = igmp_hdr(skb);
397 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
398 ih->code = (group ? br->multicast_last_member_interval :
399 br->multicast_query_response_interval) /
400 (HZ / IGMP_TIMER_SCALE);
401 ih->group = group;
402 ih->csum = 0;
403 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
404 skb_put(skb, sizeof(*ih));
405
406 __skb_pull(skb, sizeof(*eth));
407
408 out:
409 return skb;
410 }
411
412 #if IS_ENABLED(CONFIG_IPV6)
413 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
414 const struct in6_addr *group)
415 {
416 struct sk_buff *skb;
417 struct ipv6hdr *ip6h;
418 struct mld_msg *mldq;
419 struct ethhdr *eth;
420 u8 *hopopt;
421 unsigned long interval;
422
423 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
424 8 + sizeof(*mldq));
425 if (!skb)
426 goto out;
427
428 skb->protocol = htons(ETH_P_IPV6);
429
430 /* Ethernet header */
431 skb_reset_mac_header(skb);
432 eth = eth_hdr(skb);
433
434 memcpy(eth->h_source, br->dev->dev_addr, 6);
435 eth->h_proto = htons(ETH_P_IPV6);
436 skb_put(skb, sizeof(*eth));
437
438 /* IPv6 header + HbH option */
439 skb_set_network_header(skb, skb->len);
440 ip6h = ipv6_hdr(skb);
441
442 *(__force __be32 *)ip6h = htonl(0x60000000);
443 ip6h->payload_len = htons(8 + sizeof(*mldq));
444 ip6h->nexthdr = IPPROTO_HOPOPTS;
445 ip6h->hop_limit = 1;
446 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
447 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
448 &ip6h->saddr)) {
449 kfree_skb(skb);
450 return NULL;
451 }
452 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
453
454 hopopt = (u8 *)(ip6h + 1);
455 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
456 hopopt[1] = 0; /* length of HbH */
457 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
458 hopopt[3] = 2; /* Length of RA Option */
459 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
460 hopopt[5] = 0;
461 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
462 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
463
464 skb_put(skb, sizeof(*ip6h) + 8);
465
466 /* ICMPv6 */
467 skb_set_transport_header(skb, skb->len);
468 mldq = (struct mld_msg *) icmp6_hdr(skb);
469
470 interval = ipv6_addr_any(group) ?
471 br->multicast_query_response_interval :
472 br->multicast_last_member_interval;
473
474 mldq->mld_type = ICMPV6_MGM_QUERY;
475 mldq->mld_code = 0;
476 mldq->mld_cksum = 0;
477 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
478 mldq->mld_reserved = 0;
479 mldq->mld_mca = *group;
480
481 /* checksum */
482 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
483 sizeof(*mldq), IPPROTO_ICMPV6,
484 csum_partial(mldq,
485 sizeof(*mldq), 0));
486 skb_put(skb, sizeof(*mldq));
487
488 __skb_pull(skb, sizeof(*eth));
489
490 out:
491 return skb;
492 }
493 #endif
494
495 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
496 struct br_ip *addr)
497 {
498 switch (addr->proto) {
499 case htons(ETH_P_IP):
500 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
501 #if IS_ENABLED(CONFIG_IPV6)
502 case htons(ETH_P_IPV6):
503 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
504 #endif
505 }
506 return NULL;
507 }
508
509 static struct net_bridge_mdb_entry *br_multicast_get_group(
510 struct net_bridge *br, struct net_bridge_port *port,
511 struct br_ip *group, int hash)
512 {
513 struct net_bridge_mdb_htable *mdb;
514 struct net_bridge_mdb_entry *mp;
515 unsigned int count = 0;
516 unsigned int max;
517 int elasticity;
518 int err;
519
520 mdb = rcu_dereference_protected(br->mdb, 1);
521 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
522 count++;
523 if (unlikely(br_ip_equal(group, &mp->addr)))
524 return mp;
525 }
526
527 elasticity = 0;
528 max = mdb->max;
529
530 if (unlikely(count > br->hash_elasticity && count)) {
531 if (net_ratelimit())
532 br_info(br, "Multicast hash table "
533 "chain limit reached: %s\n",
534 port ? port->dev->name : br->dev->name);
535
536 elasticity = br->hash_elasticity;
537 }
538
539 if (mdb->size >= max) {
540 max *= 2;
541 if (unlikely(max > br->hash_max)) {
542 br_warn(br, "Multicast hash table maximum of %d "
543 "reached, disabling snooping: %s\n",
544 br->hash_max,
545 port ? port->dev->name : br->dev->name);
546 err = -E2BIG;
547 disable:
548 br->multicast_disabled = 1;
549 goto err;
550 }
551 }
552
553 if (max > mdb->max || elasticity) {
554 if (mdb->old) {
555 if (net_ratelimit())
556 br_info(br, "Multicast hash table "
557 "on fire: %s\n",
558 port ? port->dev->name : br->dev->name);
559 err = -EEXIST;
560 goto err;
561 }
562
563 err = br_mdb_rehash(&br->mdb, max, elasticity);
564 if (err) {
565 br_warn(br, "Cannot rehash multicast "
566 "hash table, disabling snooping: %s, %d, %d\n",
567 port ? port->dev->name : br->dev->name,
568 mdb->size, err);
569 goto disable;
570 }
571
572 err = -EAGAIN;
573 goto err;
574 }
575
576 return NULL;
577
578 err:
579 mp = ERR_PTR(err);
580 return mp;
581 }
582
583 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
584 struct net_bridge_port *port, struct br_ip *group)
585 {
586 struct net_bridge_mdb_htable *mdb;
587 struct net_bridge_mdb_entry *mp;
588 int hash;
589 int err;
590
591 mdb = rcu_dereference_protected(br->mdb, 1);
592 if (!mdb) {
593 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
594 if (err)
595 return ERR_PTR(err);
596 goto rehash;
597 }
598
599 hash = br_ip_hash(mdb, group);
600 mp = br_multicast_get_group(br, port, group, hash);
601 switch (PTR_ERR(mp)) {
602 case 0:
603 break;
604
605 case -EAGAIN:
606 rehash:
607 mdb = rcu_dereference_protected(br->mdb, 1);
608 hash = br_ip_hash(mdb, group);
609 break;
610
611 default:
612 goto out;
613 }
614
615 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
616 if (unlikely(!mp))
617 return ERR_PTR(-ENOMEM);
618
619 mp->br = br;
620 mp->addr = *group;
621
622 setup_timer(&mp->timer, br_multicast_group_expired,
623 (unsigned long)mp);
624
625 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
626 mdb->size++;
627
628 out:
629 return mp;
630 }
631
632 struct net_bridge_port_group *br_multicast_new_port_group(
633 struct net_bridge_port *port,
634 struct br_ip *group,
635 struct net_bridge_port_group __rcu *next,
636 unsigned char state)
637 {
638 struct net_bridge_port_group *p;
639
640 p = kzalloc(sizeof(*p), GFP_ATOMIC);
641 if (unlikely(!p))
642 return NULL;
643
644 p->addr = *group;
645 p->port = port;
646 p->state = state;
647 rcu_assign_pointer(p->next, next);
648 hlist_add_head(&p->mglist, &port->mglist);
649 setup_timer(&p->timer, br_multicast_port_group_expired,
650 (unsigned long)p);
651 return p;
652 }
653
654 static int br_multicast_add_group(struct net_bridge *br,
655 struct net_bridge_port *port,
656 struct br_ip *group)
657 {
658 struct net_bridge_mdb_entry *mp;
659 struct net_bridge_port_group *p;
660 struct net_bridge_port_group __rcu **pp;
661 int err;
662
663 spin_lock(&br->multicast_lock);
664 if (!netif_running(br->dev) ||
665 (port && port->state == BR_STATE_DISABLED))
666 goto out;
667
668 mp = br_multicast_new_group(br, port, group);
669 err = PTR_ERR(mp);
670 if (IS_ERR(mp))
671 goto err;
672
673 if (!port) {
674 mp->mglist = true;
675 goto out;
676 }
677
678 for (pp = &mp->ports;
679 (p = mlock_dereference(*pp, br)) != NULL;
680 pp = &p->next) {
681 if (p->port == port)
682 goto out;
683 if ((unsigned long)p->port < (unsigned long)port)
684 break;
685 }
686
687 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
688 if (unlikely(!p))
689 goto err;
690 rcu_assign_pointer(*pp, p);
691 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
692
693 out:
694 err = 0;
695
696 err:
697 spin_unlock(&br->multicast_lock);
698 return err;
699 }
700
701 static int br_ip4_multicast_add_group(struct net_bridge *br,
702 struct net_bridge_port *port,
703 __be32 group,
704 __u16 vid)
705 {
706 struct br_ip br_group;
707
708 if (ipv4_is_local_multicast(group))
709 return 0;
710
711 br_group.u.ip4 = group;
712 br_group.proto = htons(ETH_P_IP);
713 br_group.vid = vid;
714
715 return br_multicast_add_group(br, port, &br_group);
716 }
717
718 #if IS_ENABLED(CONFIG_IPV6)
719 static int br_ip6_multicast_add_group(struct net_bridge *br,
720 struct net_bridge_port *port,
721 const struct in6_addr *group,
722 __u16 vid)
723 {
724 struct br_ip br_group;
725
726 if (!ipv6_is_transient_multicast(group))
727 return 0;
728
729 br_group.u.ip6 = *group;
730 br_group.proto = htons(ETH_P_IPV6);
731 br_group.vid = vid;
732
733 return br_multicast_add_group(br, port, &br_group);
734 }
735 #endif
736
737 static void br_multicast_router_expired(unsigned long data)
738 {
739 struct net_bridge_port *port = (void *)data;
740 struct net_bridge *br = port->br;
741
742 spin_lock(&br->multicast_lock);
743 if (port->multicast_router != 1 ||
744 timer_pending(&port->multicast_router_timer) ||
745 hlist_unhashed(&port->rlist))
746 goto out;
747
748 hlist_del_init_rcu(&port->rlist);
749
750 out:
751 spin_unlock(&br->multicast_lock);
752 }
753
754 static void br_multicast_local_router_expired(unsigned long data)
755 {
756 }
757
758 static void br_multicast_querier_expired(unsigned long data)
759 {
760 struct net_bridge *br = (void *)data;
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);
767
768 out:
769 spin_unlock(&br->multicast_lock);
770 }
771
772 static void __br_multicast_send_query(struct net_bridge *br,
773 struct net_bridge_port *port,
774 struct br_ip *ip)
775 {
776 struct sk_buff *skb;
777
778 skb = br_multicast_alloc_query(br, ip);
779 if (!skb)
780 return;
781
782 if (port) {
783 __skb_push(skb, sizeof(struct ethhdr));
784 skb->dev = port->dev;
785 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
786 dev_queue_xmit);
787 } else
788 netif_rx(skb);
789 }
790
791 static void br_multicast_send_query(struct net_bridge *br,
792 struct net_bridge_port *port, u32 sent)
793 {
794 unsigned long time;
795 struct br_ip br_group;
796
797 if (!netif_running(br->dev) || br->multicast_disabled ||
798 !br->multicast_querier ||
799 timer_pending(&br->multicast_querier_timer))
800 return;
801
802 memset(&br_group.u, 0, sizeof(br_group.u));
803
804 br_group.proto = htons(ETH_P_IP);
805 __br_multicast_send_query(br, port, &br_group);
806
807 #if IS_ENABLED(CONFIG_IPV6)
808 br_group.proto = htons(ETH_P_IPV6);
809 __br_multicast_send_query(br, port, &br_group);
810 #endif
811
812 time = jiffies;
813 time += sent < br->multicast_startup_query_count ?
814 br->multicast_startup_query_interval :
815 br->multicast_query_interval;
816 mod_timer(port ? &port->multicast_query_timer :
817 &br->multicast_query_timer, time);
818 }
819
820 static void br_multicast_port_query_expired(unsigned long data)
821 {
822 struct net_bridge_port *port = (void *)data;
823 struct net_bridge *br = port->br;
824
825 spin_lock(&br->multicast_lock);
826 if (port->state == BR_STATE_DISABLED ||
827 port->state == BR_STATE_BLOCKING)
828 goto out;
829
830 if (port->multicast_startup_queries_sent <
831 br->multicast_startup_query_count)
832 port->multicast_startup_queries_sent++;
833
834 br_multicast_send_query(port->br, port,
835 port->multicast_startup_queries_sent);
836
837 out:
838 spin_unlock(&br->multicast_lock);
839 }
840
841 void br_multicast_add_port(struct net_bridge_port *port)
842 {
843 port->multicast_router = 1;
844
845 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
846 (unsigned long)port);
847 setup_timer(&port->multicast_query_timer,
848 br_multicast_port_query_expired, (unsigned long)port);
849 }
850
851 void br_multicast_del_port(struct net_bridge_port *port)
852 {
853 del_timer_sync(&port->multicast_router_timer);
854 }
855
856 static void __br_multicast_enable_port(struct net_bridge_port *port)
857 {
858 port->multicast_startup_queries_sent = 0;
859
860 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
861 del_timer(&port->multicast_query_timer))
862 mod_timer(&port->multicast_query_timer, jiffies);
863 }
864
865 void br_multicast_enable_port(struct net_bridge_port *port)
866 {
867 struct net_bridge *br = port->br;
868
869 spin_lock(&br->multicast_lock);
870 if (br->multicast_disabled || !netif_running(br->dev))
871 goto out;
872
873 __br_multicast_enable_port(port);
874
875 out:
876 spin_unlock(&br->multicast_lock);
877 }
878
879 void br_multicast_disable_port(struct net_bridge_port *port)
880 {
881 struct net_bridge *br = port->br;
882 struct net_bridge_port_group *pg;
883 struct hlist_node *n;
884
885 spin_lock(&br->multicast_lock);
886 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
887 br_multicast_del_pg(br, pg);
888
889 if (!hlist_unhashed(&port->rlist))
890 hlist_del_init_rcu(&port->rlist);
891 del_timer(&port->multicast_router_timer);
892 del_timer(&port->multicast_query_timer);
893 spin_unlock(&br->multicast_lock);
894 }
895
896 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
897 struct net_bridge_port *port,
898 struct sk_buff *skb)
899 {
900 struct igmpv3_report *ih;
901 struct igmpv3_grec *grec;
902 int i;
903 int len;
904 int num;
905 int type;
906 int err = 0;
907 __be32 group;
908 u16 vid = 0;
909
910 if (!pskb_may_pull(skb, sizeof(*ih)))
911 return -EINVAL;
912
913 br_vlan_get_tag(skb, &vid);
914 ih = igmpv3_report_hdr(skb);
915 num = ntohs(ih->ngrec);
916 len = sizeof(*ih);
917
918 for (i = 0; i < num; i++) {
919 len += sizeof(*grec);
920 if (!pskb_may_pull(skb, len))
921 return -EINVAL;
922
923 grec = (void *)(skb->data + len - sizeof(*grec));
924 group = grec->grec_mca;
925 type = grec->grec_type;
926
927 len += ntohs(grec->grec_nsrcs) * 4;
928 if (!pskb_may_pull(skb, len))
929 return -EINVAL;
930
931 /* We treat this as an IGMPv2 report for now. */
932 switch (type) {
933 case IGMPV3_MODE_IS_INCLUDE:
934 case IGMPV3_MODE_IS_EXCLUDE:
935 case IGMPV3_CHANGE_TO_INCLUDE:
936 case IGMPV3_CHANGE_TO_EXCLUDE:
937 case IGMPV3_ALLOW_NEW_SOURCES:
938 case IGMPV3_BLOCK_OLD_SOURCES:
939 break;
940
941 default:
942 continue;
943 }
944
945 err = br_ip4_multicast_add_group(br, port, group, vid);
946 if (err)
947 break;
948 }
949
950 return err;
951 }
952
953 #if IS_ENABLED(CONFIG_IPV6)
954 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
955 struct net_bridge_port *port,
956 struct sk_buff *skb)
957 {
958 struct icmp6hdr *icmp6h;
959 struct mld2_grec *grec;
960 int i;
961 int len;
962 int num;
963 int err = 0;
964 u16 vid = 0;
965
966 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
967 return -EINVAL;
968
969 br_vlan_get_tag(skb, &vid);
970 icmp6h = icmp6_hdr(skb);
971 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
972 len = sizeof(*icmp6h);
973
974 for (i = 0; i < num; i++) {
975 __be16 *nsrcs, _nsrcs;
976
977 nsrcs = skb_header_pointer(skb,
978 len + offsetof(struct mld2_grec,
979 grec_nsrcs),
980 sizeof(_nsrcs), &_nsrcs);
981 if (!nsrcs)
982 return -EINVAL;
983
984 if (!pskb_may_pull(skb,
985 len + sizeof(*grec) +
986 sizeof(struct in6_addr) * ntohs(*nsrcs)))
987 return -EINVAL;
988
989 grec = (struct mld2_grec *)(skb->data + len);
990 len += sizeof(*grec) +
991 sizeof(struct in6_addr) * ntohs(*nsrcs);
992
993 /* We treat these as MLDv1 reports for now. */
994 switch (grec->grec_type) {
995 case MLD2_MODE_IS_INCLUDE:
996 case MLD2_MODE_IS_EXCLUDE:
997 case MLD2_CHANGE_TO_INCLUDE:
998 case MLD2_CHANGE_TO_EXCLUDE:
999 case MLD2_ALLOW_NEW_SOURCES:
1000 case MLD2_BLOCK_OLD_SOURCES:
1001 break;
1002
1003 default:
1004 continue;
1005 }
1006
1007 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1008 vid);
1009 if (!err)
1010 break;
1011 }
1012
1013 return err;
1014 }
1015 #endif
1016
1017 static void br_multicast_update_querier_timer(struct net_bridge *br,
1018 unsigned long max_delay)
1019 {
1020 if (!timer_pending(&br->multicast_querier_timer))
1021 br->multicast_querier_delay_time = jiffies + max_delay;
1022
1023 mod_timer(&br->multicast_querier_timer,
1024 jiffies + br->multicast_querier_interval);
1025 }
1026
1027 /*
1028 * Add port to router_list
1029 * list is maintained ordered by pointer value
1030 * and locked by br->multicast_lock and RCU
1031 */
1032 static void br_multicast_add_router(struct net_bridge *br,
1033 struct net_bridge_port *port)
1034 {
1035 struct net_bridge_port *p;
1036 struct hlist_node *slot = NULL;
1037
1038 hlist_for_each_entry(p, &br->router_list, rlist) {
1039 if ((unsigned long) port >= (unsigned long) p)
1040 break;
1041 slot = &p->rlist;
1042 }
1043
1044 if (slot)
1045 hlist_add_after_rcu(slot, &port->rlist);
1046 else
1047 hlist_add_head_rcu(&port->rlist, &br->router_list);
1048 }
1049
1050 static void br_multicast_mark_router(struct net_bridge *br,
1051 struct net_bridge_port *port)
1052 {
1053 unsigned long now = jiffies;
1054
1055 if (!port) {
1056 if (br->multicast_router == 1)
1057 mod_timer(&br->multicast_router_timer,
1058 now + br->multicast_querier_interval);
1059 return;
1060 }
1061
1062 if (port->multicast_router != 1)
1063 return;
1064
1065 if (!hlist_unhashed(&port->rlist))
1066 goto timer;
1067
1068 br_multicast_add_router(br, port);
1069
1070 timer:
1071 mod_timer(&port->multicast_router_timer,
1072 now + br->multicast_querier_interval);
1073 }
1074
1075 static void br_multicast_query_received(struct net_bridge *br,
1076 struct net_bridge_port *port,
1077 int saddr,
1078 unsigned long max_delay)
1079 {
1080 if (saddr)
1081 br_multicast_update_querier_timer(br, max_delay);
1082 else if (timer_pending(&br->multicast_querier_timer))
1083 return;
1084
1085 br_multicast_mark_router(br, port);
1086 }
1087
1088 static int br_ip4_multicast_query(struct net_bridge *br,
1089 struct net_bridge_port *port,
1090 struct sk_buff *skb)
1091 {
1092 const struct iphdr *iph = ip_hdr(skb);
1093 struct igmphdr *ih = igmp_hdr(skb);
1094 struct net_bridge_mdb_entry *mp;
1095 struct igmpv3_query *ih3;
1096 struct net_bridge_port_group *p;
1097 struct net_bridge_port_group __rcu **pp;
1098 unsigned long max_delay;
1099 unsigned long now = jiffies;
1100 __be32 group;
1101 int err = 0;
1102 u16 vid = 0;
1103
1104 spin_lock(&br->multicast_lock);
1105 if (!netif_running(br->dev) ||
1106 (port && port->state == BR_STATE_DISABLED))
1107 goto out;
1108
1109 group = ih->group;
1110
1111 if (skb->len == sizeof(*ih)) {
1112 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1113
1114 if (!max_delay) {
1115 max_delay = 10 * HZ;
1116 group = 0;
1117 }
1118 } else {
1119 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1120 err = -EINVAL;
1121 goto out;
1122 }
1123
1124 ih3 = igmpv3_query_hdr(skb);
1125 if (ih3->nsrcs)
1126 goto out;
1127
1128 max_delay = ih3->code ?
1129 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1130 }
1131
1132 br_multicast_query_received(br, port, !!iph->saddr, max_delay);
1133
1134 if (!group)
1135 goto out;
1136
1137 br_vlan_get_tag(skb, &vid);
1138 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1139 if (!mp)
1140 goto out;
1141
1142 mod_timer(&mp->timer, now + br->multicast_membership_interval);
1143 mp->timer_armed = true;
1144
1145 max_delay *= br->multicast_last_member_count;
1146
1147 if (mp->mglist &&
1148 (timer_pending(&mp->timer) ?
1149 time_after(mp->timer.expires, now + max_delay) :
1150 try_to_del_timer_sync(&mp->timer) >= 0))
1151 mod_timer(&mp->timer, now + max_delay);
1152
1153 for (pp = &mp->ports;
1154 (p = mlock_dereference(*pp, br)) != NULL;
1155 pp = &p->next) {
1156 if (timer_pending(&p->timer) ?
1157 time_after(p->timer.expires, now + max_delay) :
1158 try_to_del_timer_sync(&p->timer) >= 0)
1159 mod_timer(&p->timer, now + max_delay);
1160 }
1161
1162 out:
1163 spin_unlock(&br->multicast_lock);
1164 return err;
1165 }
1166
1167 #if IS_ENABLED(CONFIG_IPV6)
1168 static int br_ip6_multicast_query(struct net_bridge *br,
1169 struct net_bridge_port *port,
1170 struct sk_buff *skb)
1171 {
1172 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1173 struct mld_msg *mld;
1174 struct net_bridge_mdb_entry *mp;
1175 struct mld2_query *mld2q;
1176 struct net_bridge_port_group *p;
1177 struct net_bridge_port_group __rcu **pp;
1178 unsigned long max_delay;
1179 unsigned long now = jiffies;
1180 const struct in6_addr *group = NULL;
1181 int err = 0;
1182 u16 vid = 0;
1183
1184 spin_lock(&br->multicast_lock);
1185 if (!netif_running(br->dev) ||
1186 (port && port->state == BR_STATE_DISABLED))
1187 goto out;
1188
1189 if (skb->len == sizeof(*mld)) {
1190 if (!pskb_may_pull(skb, sizeof(*mld))) {
1191 err = -EINVAL;
1192 goto out;
1193 }
1194 mld = (struct mld_msg *) icmp6_hdr(skb);
1195 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1196 if (max_delay)
1197 group = &mld->mld_mca;
1198 } else {
1199 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1200 err = -EINVAL;
1201 goto out;
1202 }
1203 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1204 if (!mld2q->mld2q_nsrcs)
1205 group = &mld2q->mld2q_mca;
1206
1207 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1208 }
1209
1210 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr),
1211 max_delay);
1212
1213 if (!group)
1214 goto out;
1215
1216 br_vlan_get_tag(skb, &vid);
1217 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1218 if (!mp)
1219 goto out;
1220
1221 mod_timer(&mp->timer, now + br->multicast_membership_interval);
1222 mp->timer_armed = true;
1223
1224 max_delay *= br->multicast_last_member_count;
1225 if (mp->mglist &&
1226 (timer_pending(&mp->timer) ?
1227 time_after(mp->timer.expires, now + max_delay) :
1228 try_to_del_timer_sync(&mp->timer) >= 0))
1229 mod_timer(&mp->timer, now + max_delay);
1230
1231 for (pp = &mp->ports;
1232 (p = mlock_dereference(*pp, br)) != NULL;
1233 pp = &p->next) {
1234 if (timer_pending(&p->timer) ?
1235 time_after(p->timer.expires, now + max_delay) :
1236 try_to_del_timer_sync(&p->timer) >= 0)
1237 mod_timer(&p->timer, now + max_delay);
1238 }
1239
1240 out:
1241 spin_unlock(&br->multicast_lock);
1242 return err;
1243 }
1244 #endif
1245
1246 static void br_multicast_leave_group(struct net_bridge *br,
1247 struct net_bridge_port *port,
1248 struct br_ip *group)
1249 {
1250 struct net_bridge_mdb_htable *mdb;
1251 struct net_bridge_mdb_entry *mp;
1252 struct net_bridge_port_group *p;
1253 unsigned long now;
1254 unsigned long time;
1255
1256 spin_lock(&br->multicast_lock);
1257 if (!netif_running(br->dev) ||
1258 (port && port->state == BR_STATE_DISABLED) ||
1259 timer_pending(&br->multicast_querier_timer))
1260 goto out;
1261
1262 mdb = mlock_dereference(br->mdb, br);
1263 mp = br_mdb_ip_get(mdb, group);
1264 if (!mp)
1265 goto out;
1266
1267 if (br->multicast_querier &&
1268 !timer_pending(&br->multicast_querier_timer)) {
1269 __br_multicast_send_query(br, port, &mp->addr);
1270
1271 time = jiffies + br->multicast_last_member_count *
1272 br->multicast_last_member_interval;
1273 mod_timer(port ? &port->multicast_query_timer :
1274 &br->multicast_query_timer, time);
1275
1276 for (p = mlock_dereference(mp->ports, br);
1277 p != NULL;
1278 p = mlock_dereference(p->next, br)) {
1279 if (p->port != port)
1280 continue;
1281
1282 if (!hlist_unhashed(&p->mglist) &&
1283 (timer_pending(&p->timer) ?
1284 time_after(p->timer.expires, time) :
1285 try_to_del_timer_sync(&p->timer) >= 0)) {
1286 mod_timer(&p->timer, time);
1287 }
1288
1289 break;
1290 }
1291 }
1292
1293 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1294 struct net_bridge_port_group __rcu **pp;
1295
1296 for (pp = &mp->ports;
1297 (p = mlock_dereference(*pp, br)) != NULL;
1298 pp = &p->next) {
1299 if (p->port != port)
1300 continue;
1301
1302 rcu_assign_pointer(*pp, p->next);
1303 hlist_del_init(&p->mglist);
1304 del_timer(&p->timer);
1305 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1306 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1307
1308 if (!mp->ports && !mp->mglist && mp->timer_armed &&
1309 netif_running(br->dev))
1310 mod_timer(&mp->timer, jiffies);
1311 }
1312 goto out;
1313 }
1314
1315 now = jiffies;
1316 time = now + br->multicast_last_member_count *
1317 br->multicast_last_member_interval;
1318
1319 if (!port) {
1320 if (mp->mglist && mp->timer_armed &&
1321 (timer_pending(&mp->timer) ?
1322 time_after(mp->timer.expires, time) :
1323 try_to_del_timer_sync(&mp->timer) >= 0)) {
1324 mod_timer(&mp->timer, time);
1325 }
1326 }
1327
1328 out:
1329 spin_unlock(&br->multicast_lock);
1330 }
1331
1332 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1333 struct net_bridge_port *port,
1334 __be32 group,
1335 __u16 vid)
1336 {
1337 struct br_ip br_group;
1338
1339 if (ipv4_is_local_multicast(group))
1340 return;
1341
1342 br_group.u.ip4 = group;
1343 br_group.proto = htons(ETH_P_IP);
1344 br_group.vid = vid;
1345
1346 br_multicast_leave_group(br, port, &br_group);
1347 }
1348
1349 #if IS_ENABLED(CONFIG_IPV6)
1350 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1351 struct net_bridge_port *port,
1352 const struct in6_addr *group,
1353 __u16 vid)
1354 {
1355 struct br_ip br_group;
1356
1357 if (!ipv6_is_transient_multicast(group))
1358 return;
1359
1360 br_group.u.ip6 = *group;
1361 br_group.proto = htons(ETH_P_IPV6);
1362 br_group.vid = vid;
1363
1364 br_multicast_leave_group(br, port, &br_group);
1365 }
1366 #endif
1367
1368 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1369 struct net_bridge_port *port,
1370 struct sk_buff *skb)
1371 {
1372 struct sk_buff *skb2 = skb;
1373 const struct iphdr *iph;
1374 struct igmphdr *ih;
1375 unsigned int len;
1376 unsigned int offset;
1377 int err;
1378 u16 vid = 0;
1379
1380 /* We treat OOM as packet loss for now. */
1381 if (!pskb_may_pull(skb, sizeof(*iph)))
1382 return -EINVAL;
1383
1384 iph = ip_hdr(skb);
1385
1386 if (iph->ihl < 5 || iph->version != 4)
1387 return -EINVAL;
1388
1389 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1390 return -EINVAL;
1391
1392 iph = ip_hdr(skb);
1393
1394 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1395 return -EINVAL;
1396
1397 if (iph->protocol != IPPROTO_IGMP) {
1398 if (!ipv4_is_local_multicast(iph->daddr))
1399 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1400 return 0;
1401 }
1402
1403 len = ntohs(iph->tot_len);
1404 if (skb->len < len || len < ip_hdrlen(skb))
1405 return -EINVAL;
1406
1407 if (skb->len > len) {
1408 skb2 = skb_clone(skb, GFP_ATOMIC);
1409 if (!skb2)
1410 return -ENOMEM;
1411
1412 err = pskb_trim_rcsum(skb2, len);
1413 if (err)
1414 goto err_out;
1415 }
1416
1417 len -= ip_hdrlen(skb2);
1418 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1419 __skb_pull(skb2, offset);
1420 skb_reset_transport_header(skb2);
1421
1422 err = -EINVAL;
1423 if (!pskb_may_pull(skb2, sizeof(*ih)))
1424 goto out;
1425
1426 switch (skb2->ip_summed) {
1427 case CHECKSUM_COMPLETE:
1428 if (!csum_fold(skb2->csum))
1429 break;
1430 /* fall through */
1431 case CHECKSUM_NONE:
1432 skb2->csum = 0;
1433 if (skb_checksum_complete(skb2))
1434 goto out;
1435 }
1436
1437 err = 0;
1438
1439 br_vlan_get_tag(skb2, &vid);
1440 BR_INPUT_SKB_CB(skb)->igmp = 1;
1441 ih = igmp_hdr(skb2);
1442
1443 switch (ih->type) {
1444 case IGMP_HOST_MEMBERSHIP_REPORT:
1445 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1446 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1447 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1448 break;
1449 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1450 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1451 break;
1452 case IGMP_HOST_MEMBERSHIP_QUERY:
1453 err = br_ip4_multicast_query(br, port, skb2);
1454 break;
1455 case IGMP_HOST_LEAVE_MESSAGE:
1456 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1457 break;
1458 }
1459
1460 out:
1461 __skb_push(skb2, offset);
1462 err_out:
1463 if (skb2 != skb)
1464 kfree_skb(skb2);
1465 return err;
1466 }
1467
1468 #if IS_ENABLED(CONFIG_IPV6)
1469 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1470 struct net_bridge_port *port,
1471 struct sk_buff *skb)
1472 {
1473 struct sk_buff *skb2;
1474 const struct ipv6hdr *ip6h;
1475 u8 icmp6_type;
1476 u8 nexthdr;
1477 __be16 frag_off;
1478 unsigned int len;
1479 int offset;
1480 int err;
1481 u16 vid = 0;
1482
1483 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1484 return -EINVAL;
1485
1486 ip6h = ipv6_hdr(skb);
1487
1488 /*
1489 * We're interested in MLD messages only.
1490 * - Version is 6
1491 * - MLD has always Router Alert hop-by-hop option
1492 * - But we do not support jumbrograms.
1493 */
1494 if (ip6h->version != 6 ||
1495 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1496 ip6h->payload_len == 0)
1497 return 0;
1498
1499 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1500 if (skb->len < len)
1501 return -EINVAL;
1502
1503 nexthdr = ip6h->nexthdr;
1504 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1505
1506 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1507 return 0;
1508
1509 /* Okay, we found ICMPv6 header */
1510 skb2 = skb_clone(skb, GFP_ATOMIC);
1511 if (!skb2)
1512 return -ENOMEM;
1513
1514 err = -EINVAL;
1515 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1516 goto out;
1517
1518 len -= offset - skb_network_offset(skb2);
1519
1520 __skb_pull(skb2, offset);
1521 skb_reset_transport_header(skb2);
1522 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1523 skb_network_header_len(skb2));
1524
1525 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1526
1527 switch (icmp6_type) {
1528 case ICMPV6_MGM_QUERY:
1529 case ICMPV6_MGM_REPORT:
1530 case ICMPV6_MGM_REDUCTION:
1531 case ICMPV6_MLD2_REPORT:
1532 break;
1533 default:
1534 err = 0;
1535 goto out;
1536 }
1537
1538 /* Okay, we found MLD message. Check further. */
1539 if (skb2->len > len) {
1540 err = pskb_trim_rcsum(skb2, len);
1541 if (err)
1542 goto out;
1543 err = -EINVAL;
1544 }
1545
1546 ip6h = ipv6_hdr(skb2);
1547
1548 switch (skb2->ip_summed) {
1549 case CHECKSUM_COMPLETE:
1550 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1551 IPPROTO_ICMPV6, skb2->csum))
1552 break;
1553 /*FALLTHROUGH*/
1554 case CHECKSUM_NONE:
1555 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1556 &ip6h->daddr,
1557 skb2->len,
1558 IPPROTO_ICMPV6, 0));
1559 if (__skb_checksum_complete(skb2))
1560 goto out;
1561 }
1562
1563 err = 0;
1564
1565 br_vlan_get_tag(skb, &vid);
1566 BR_INPUT_SKB_CB(skb)->igmp = 1;
1567
1568 switch (icmp6_type) {
1569 case ICMPV6_MGM_REPORT:
1570 {
1571 struct mld_msg *mld;
1572 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1573 err = -EINVAL;
1574 goto out;
1575 }
1576 mld = (struct mld_msg *)skb_transport_header(skb2);
1577 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1578 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1579 break;
1580 }
1581 case ICMPV6_MLD2_REPORT:
1582 err = br_ip6_multicast_mld2_report(br, port, skb2);
1583 break;
1584 case ICMPV6_MGM_QUERY:
1585 err = br_ip6_multicast_query(br, port, skb2);
1586 break;
1587 case ICMPV6_MGM_REDUCTION:
1588 {
1589 struct mld_msg *mld;
1590 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1591 err = -EINVAL;
1592 goto out;
1593 }
1594 mld = (struct mld_msg *)skb_transport_header(skb2);
1595 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1596 }
1597 }
1598
1599 out:
1600 kfree_skb(skb2);
1601 return err;
1602 }
1603 #endif
1604
1605 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1606 struct sk_buff *skb)
1607 {
1608 BR_INPUT_SKB_CB(skb)->igmp = 0;
1609 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1610
1611 if (br->multicast_disabled)
1612 return 0;
1613
1614 switch (skb->protocol) {
1615 case htons(ETH_P_IP):
1616 return br_multicast_ipv4_rcv(br, port, skb);
1617 #if IS_ENABLED(CONFIG_IPV6)
1618 case htons(ETH_P_IPV6):
1619 return br_multicast_ipv6_rcv(br, port, skb);
1620 #endif
1621 }
1622
1623 return 0;
1624 }
1625
1626 static void br_multicast_query_expired(unsigned long data)
1627 {
1628 struct net_bridge *br = (void *)data;
1629
1630 spin_lock(&br->multicast_lock);
1631 if (br->multicast_startup_queries_sent <
1632 br->multicast_startup_query_count)
1633 br->multicast_startup_queries_sent++;
1634
1635 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1636
1637 spin_unlock(&br->multicast_lock);
1638 }
1639
1640 void br_multicast_init(struct net_bridge *br)
1641 {
1642 br->hash_elasticity = 4;
1643 br->hash_max = 512;
1644
1645 br->multicast_router = 1;
1646 br->multicast_querier = 0;
1647 br->multicast_query_use_ifaddr = 0;
1648 br->multicast_last_member_count = 2;
1649 br->multicast_startup_query_count = 2;
1650
1651 br->multicast_last_member_interval = HZ;
1652 br->multicast_query_response_interval = 10 * HZ;
1653 br->multicast_startup_query_interval = 125 * HZ / 4;
1654 br->multicast_query_interval = 125 * HZ;
1655 br->multicast_querier_interval = 255 * HZ;
1656 br->multicast_membership_interval = 260 * HZ;
1657
1658 br->multicast_querier_delay_time = 0;
1659
1660 spin_lock_init(&br->multicast_lock);
1661 setup_timer(&br->multicast_router_timer,
1662 br_multicast_local_router_expired, 0);
1663 setup_timer(&br->multicast_querier_timer,
1664 br_multicast_querier_expired, (unsigned long)br);
1665 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1666 (unsigned long)br);
1667 }
1668
1669 void br_multicast_open(struct net_bridge *br)
1670 {
1671 br->multicast_startup_queries_sent = 0;
1672
1673 if (br->multicast_disabled)
1674 return;
1675
1676 mod_timer(&br->multicast_query_timer, jiffies);
1677 }
1678
1679 void br_multicast_stop(struct net_bridge *br)
1680 {
1681 struct net_bridge_mdb_htable *mdb;
1682 struct net_bridge_mdb_entry *mp;
1683 struct hlist_node *n;
1684 u32 ver;
1685 int i;
1686
1687 del_timer_sync(&br->multicast_router_timer);
1688 del_timer_sync(&br->multicast_querier_timer);
1689 del_timer_sync(&br->multicast_query_timer);
1690
1691 spin_lock_bh(&br->multicast_lock);
1692 mdb = mlock_dereference(br->mdb, br);
1693 if (!mdb)
1694 goto out;
1695
1696 br->mdb = NULL;
1697
1698 ver = mdb->ver;
1699 for (i = 0; i < mdb->max; i++) {
1700 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1701 hlist[ver]) {
1702 del_timer(&mp->timer);
1703 mp->timer_armed = false;
1704 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1705 }
1706 }
1707
1708 if (mdb->old) {
1709 spin_unlock_bh(&br->multicast_lock);
1710 rcu_barrier_bh();
1711 spin_lock_bh(&br->multicast_lock);
1712 WARN_ON(mdb->old);
1713 }
1714
1715 mdb->old = mdb;
1716 call_rcu_bh(&mdb->rcu, br_mdb_free);
1717
1718 out:
1719 spin_unlock_bh(&br->multicast_lock);
1720 }
1721
1722 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1723 {
1724 int err = -ENOENT;
1725
1726 spin_lock_bh(&br->multicast_lock);
1727 if (!netif_running(br->dev))
1728 goto unlock;
1729
1730 switch (val) {
1731 case 0:
1732 case 2:
1733 del_timer(&br->multicast_router_timer);
1734 /* fall through */
1735 case 1:
1736 br->multicast_router = val;
1737 err = 0;
1738 break;
1739
1740 default:
1741 err = -EINVAL;
1742 break;
1743 }
1744
1745 unlock:
1746 spin_unlock_bh(&br->multicast_lock);
1747
1748 return err;
1749 }
1750
1751 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1752 {
1753 struct net_bridge *br = p->br;
1754 int err = -ENOENT;
1755
1756 spin_lock(&br->multicast_lock);
1757 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1758 goto unlock;
1759
1760 switch (val) {
1761 case 0:
1762 case 1:
1763 case 2:
1764 p->multicast_router = val;
1765 err = 0;
1766
1767 if (val < 2 && !hlist_unhashed(&p->rlist))
1768 hlist_del_init_rcu(&p->rlist);
1769
1770 if (val == 1)
1771 break;
1772
1773 del_timer(&p->multicast_router_timer);
1774
1775 if (val == 0)
1776 break;
1777
1778 br_multicast_add_router(br, p);
1779 break;
1780
1781 default:
1782 err = -EINVAL;
1783 break;
1784 }
1785
1786 unlock:
1787 spin_unlock(&br->multicast_lock);
1788
1789 return err;
1790 }
1791
1792 static void br_multicast_start_querier(struct net_bridge *br)
1793 {
1794 struct net_bridge_port *port;
1795
1796 br_multicast_open(br);
1797
1798 list_for_each_entry(port, &br->port_list, list) {
1799 if (port->state == BR_STATE_DISABLED ||
1800 port->state == BR_STATE_BLOCKING)
1801 continue;
1802
1803 __br_multicast_enable_port(port);
1804 }
1805 }
1806
1807 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1808 {
1809 int err = 0;
1810 struct net_bridge_mdb_htable *mdb;
1811
1812 spin_lock_bh(&br->multicast_lock);
1813 if (br->multicast_disabled == !val)
1814 goto unlock;
1815
1816 br->multicast_disabled = !val;
1817 if (br->multicast_disabled)
1818 goto unlock;
1819
1820 if (!netif_running(br->dev))
1821 goto unlock;
1822
1823 mdb = mlock_dereference(br->mdb, br);
1824 if (mdb) {
1825 if (mdb->old) {
1826 err = -EEXIST;
1827 rollback:
1828 br->multicast_disabled = !!val;
1829 goto unlock;
1830 }
1831
1832 err = br_mdb_rehash(&br->mdb, mdb->max,
1833 br->hash_elasticity);
1834 if (err)
1835 goto rollback;
1836 }
1837
1838 br_multicast_start_querier(br);
1839
1840 unlock:
1841 spin_unlock_bh(&br->multicast_lock);
1842
1843 return err;
1844 }
1845
1846 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1847 {
1848 unsigned long max_delay;
1849
1850 val = !!val;
1851
1852 spin_lock_bh(&br->multicast_lock);
1853 if (br->multicast_querier == val)
1854 goto unlock;
1855
1856 br->multicast_querier = val;
1857 if (!val)
1858 goto unlock;
1859
1860 max_delay = br->multicast_query_response_interval;
1861 if (!timer_pending(&br->multicast_querier_timer))
1862 br->multicast_querier_delay_time = jiffies + max_delay;
1863
1864 br_multicast_start_querier(br);
1865
1866 unlock:
1867 spin_unlock_bh(&br->multicast_lock);
1868
1869 return 0;
1870 }
1871
1872 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1873 {
1874 int err = -ENOENT;
1875 u32 old;
1876 struct net_bridge_mdb_htable *mdb;
1877
1878 spin_lock(&br->multicast_lock);
1879 if (!netif_running(br->dev))
1880 goto unlock;
1881
1882 err = -EINVAL;
1883 if (!is_power_of_2(val))
1884 goto unlock;
1885
1886 mdb = mlock_dereference(br->mdb, br);
1887 if (mdb && val < mdb->size)
1888 goto unlock;
1889
1890 err = 0;
1891
1892 old = br->hash_max;
1893 br->hash_max = val;
1894
1895 if (mdb) {
1896 if (mdb->old) {
1897 err = -EEXIST;
1898 rollback:
1899 br->hash_max = old;
1900 goto unlock;
1901 }
1902
1903 err = br_mdb_rehash(&br->mdb, br->hash_max,
1904 br->hash_elasticity);
1905 if (err)
1906 goto rollback;
1907 }
1908
1909 unlock:
1910 spin_unlock(&br->multicast_lock);
1911
1912 return err;
1913 }
Linux kernel - Deliverables
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