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bridge: apply multicast snooping to IPv6 link-local, too
[mirror_ubuntu-bionic-kernel.git] / net / bridge / br_multicast.c
1 /*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13 #include <linux/err.h>
14 #include <linux/if_ether.h>
15 #include <linux/igmp.h>
16 #include <linux/jhash.h>
17 #include <linux/kernel.h>
18 #include <linux/log2.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter_bridge.h>
21 #include <linux/random.h>
22 #include <linux/rculist.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
26 #include <linux/inetdevice.h>
27 #include <net/ip.h>
28 #if IS_ENABLED(CONFIG_IPV6)
29 #include <net/ipv6.h>
30 #include <net/mld.h>
31 #include <net/ip6_checksum.h>
32 #include <net/addrconf.h>
33 #endif
34
35 #include "br_private.h"
36
37 static void br_multicast_start_querier(struct net_bridge *br);
38 unsigned int br_mdb_rehash_seq;
39
40 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
41 {
42 if (a->proto != b->proto)
43 return 0;
44 if (a->vid != b->vid)
45 return 0;
46 switch (a->proto) {
47 case htons(ETH_P_IP):
48 return a->u.ip4 == b->u.ip4;
49 #if IS_ENABLED(CONFIG_IPV6)
50 case htons(ETH_P_IPV6):
51 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
52 #endif
53 }
54 return 0;
55 }
56
57 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
58 __u16 vid)
59 {
60 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
61 }
62
63 #if IS_ENABLED(CONFIG_IPV6)
64 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
65 const struct in6_addr *ip,
66 __u16 vid)
67 {
68 return jhash_2words(ipv6_addr_hash(ip), vid,
69 mdb->secret) & (mdb->max - 1);
70 }
71 #endif
72
73 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
74 struct br_ip *ip)
75 {
76 switch (ip->proto) {
77 case htons(ETH_P_IP):
78 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
79 #if IS_ENABLED(CONFIG_IPV6)
80 case htons(ETH_P_IPV6):
81 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
82 #endif
83 }
84 return 0;
85 }
86
87 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
88 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
89 {
90 struct net_bridge_mdb_entry *mp;
91
92 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
93 if (br_ip_equal(&mp->addr, dst))
94 return mp;
95 }
96
97 return NULL;
98 }
99
100 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
101 struct br_ip *dst)
102 {
103 if (!mdb)
104 return NULL;
105
106 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
107 }
108
109 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
110 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
111 {
112 struct br_ip br_dst;
113
114 br_dst.u.ip4 = dst;
115 br_dst.proto = htons(ETH_P_IP);
116 br_dst.vid = vid;
117
118 return br_mdb_ip_get(mdb, &br_dst);
119 }
120
121 #if IS_ENABLED(CONFIG_IPV6)
122 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
123 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
124 __u16 vid)
125 {
126 struct br_ip br_dst;
127
128 br_dst.u.ip6 = *dst;
129 br_dst.proto = htons(ETH_P_IPV6);
130 br_dst.vid = vid;
131
132 return br_mdb_ip_get(mdb, &br_dst);
133 }
134 #endif
135
136 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
137 struct sk_buff *skb, u16 vid)
138 {
139 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
140 struct br_ip ip;
141
142 if (br->multicast_disabled)
143 return NULL;
144
145 if (BR_INPUT_SKB_CB(skb)->igmp)
146 return NULL;
147
148 ip.proto = skb->protocol;
149 ip.vid = vid;
150
151 switch (skb->protocol) {
152 case htons(ETH_P_IP):
153 ip.u.ip4 = ip_hdr(skb)->daddr;
154 break;
155 #if IS_ENABLED(CONFIG_IPV6)
156 case htons(ETH_P_IPV6):
157 ip.u.ip6 = ipv6_hdr(skb)->daddr;
158 break;
159 #endif
160 default:
161 return NULL;
162 }
163
164 return br_mdb_ip_get(mdb, &ip);
165 }
166
167 static void br_mdb_free(struct rcu_head *head)
168 {
169 struct net_bridge_mdb_htable *mdb =
170 container_of(head, struct net_bridge_mdb_htable, rcu);
171 struct net_bridge_mdb_htable *old = mdb->old;
172
173 mdb->old = NULL;
174 kfree(old->mhash);
175 kfree(old);
176 }
177
178 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
179 struct net_bridge_mdb_htable *old,
180 int elasticity)
181 {
182 struct net_bridge_mdb_entry *mp;
183 int maxlen;
184 int len;
185 int i;
186
187 for (i = 0; i < old->max; i++)
188 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
189 hlist_add_head(&mp->hlist[new->ver],
190 &new->mhash[br_ip_hash(new, &mp->addr)]);
191
192 if (!elasticity)
193 return 0;
194
195 maxlen = 0;
196 for (i = 0; i < new->max; i++) {
197 len = 0;
198 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
199 len++;
200 if (len > maxlen)
201 maxlen = len;
202 }
203
204 return maxlen > elasticity ? -EINVAL : 0;
205 }
206
207 void br_multicast_free_pg(struct rcu_head *head)
208 {
209 struct net_bridge_port_group *p =
210 container_of(head, struct net_bridge_port_group, rcu);
211
212 kfree(p);
213 }
214
215 static void br_multicast_free_group(struct rcu_head *head)
216 {
217 struct net_bridge_mdb_entry *mp =
218 container_of(head, struct net_bridge_mdb_entry, rcu);
219
220 kfree(mp);
221 }
222
223 static void br_multicast_group_expired(unsigned long data)
224 {
225 struct net_bridge_mdb_entry *mp = (void *)data;
226 struct net_bridge *br = mp->br;
227 struct net_bridge_mdb_htable *mdb;
228
229 spin_lock(&br->multicast_lock);
230 if (!netif_running(br->dev) || timer_pending(&mp->timer))
231 goto out;
232
233 mp->mglist = false;
234
235 if (mp->ports)
236 goto out;
237
238 mdb = mlock_dereference(br->mdb, br);
239
240 hlist_del_rcu(&mp->hlist[mdb->ver]);
241 mdb->size--;
242
243 call_rcu_bh(&mp->rcu, br_multicast_free_group);
244
245 out:
246 spin_unlock(&br->multicast_lock);
247 }
248
249 static void br_multicast_del_pg(struct net_bridge *br,
250 struct net_bridge_port_group *pg)
251 {
252 struct net_bridge_mdb_htable *mdb;
253 struct net_bridge_mdb_entry *mp;
254 struct net_bridge_port_group *p;
255 struct net_bridge_port_group __rcu **pp;
256
257 mdb = mlock_dereference(br->mdb, br);
258
259 mp = br_mdb_ip_get(mdb, &pg->addr);
260 if (WARN_ON(!mp))
261 return;
262
263 for (pp = &mp->ports;
264 (p = mlock_dereference(*pp, br)) != NULL;
265 pp = &p->next) {
266 if (p != pg)
267 continue;
268
269 rcu_assign_pointer(*pp, p->next);
270 hlist_del_init(&p->mglist);
271 del_timer(&p->timer);
272 call_rcu_bh(&p->rcu, br_multicast_free_pg);
273
274 if (!mp->ports && !mp->mglist && mp->timer_armed &&
275 netif_running(br->dev))
276 mod_timer(&mp->timer, jiffies);
277
278 return;
279 }
280
281 WARN_ON(1);
282 }
283
284 static void br_multicast_port_group_expired(unsigned long data)
285 {
286 struct net_bridge_port_group *pg = (void *)data;
287 struct net_bridge *br = pg->port->br;
288
289 spin_lock(&br->multicast_lock);
290 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
291 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
292 goto out;
293
294 br_multicast_del_pg(br, pg);
295
296 out:
297 spin_unlock(&br->multicast_lock);
298 }
299
300 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
301 int elasticity)
302 {
303 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
304 struct net_bridge_mdb_htable *mdb;
305 int err;
306
307 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
308 if (!mdb)
309 return -ENOMEM;
310
311 mdb->max = max;
312 mdb->old = old;
313
314 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
315 if (!mdb->mhash) {
316 kfree(mdb);
317 return -ENOMEM;
318 }
319
320 mdb->size = old ? old->size : 0;
321 mdb->ver = old ? old->ver ^ 1 : 0;
322
323 if (!old || elasticity)
324 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
325 else
326 mdb->secret = old->secret;
327
328 if (!old)
329 goto out;
330
331 err = br_mdb_copy(mdb, old, elasticity);
332 if (err) {
333 kfree(mdb->mhash);
334 kfree(mdb);
335 return err;
336 }
337
338 br_mdb_rehash_seq++;
339 call_rcu_bh(&mdb->rcu, br_mdb_free);
340
341 out:
342 rcu_assign_pointer(*mdbp, mdb);
343
344 return 0;
345 }
346
347 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
348 __be32 group)
349 {
350 struct sk_buff *skb;
351 struct igmphdr *ih;
352 struct ethhdr *eth;
353 struct iphdr *iph;
354
355 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
356 sizeof(*ih) + 4);
357 if (!skb)
358 goto out;
359
360 skb->protocol = htons(ETH_P_IP);
361
362 skb_reset_mac_header(skb);
363 eth = eth_hdr(skb);
364
365 memcpy(eth->h_source, br->dev->dev_addr, 6);
366 eth->h_dest[0] = 1;
367 eth->h_dest[1] = 0;
368 eth->h_dest[2] = 0x5e;
369 eth->h_dest[3] = 0;
370 eth->h_dest[4] = 0;
371 eth->h_dest[5] = 1;
372 eth->h_proto = htons(ETH_P_IP);
373 skb_put(skb, sizeof(*eth));
374
375 skb_set_network_header(skb, skb->len);
376 iph = ip_hdr(skb);
377
378 iph->version = 4;
379 iph->ihl = 6;
380 iph->tos = 0xc0;
381 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
382 iph->id = 0;
383 iph->frag_off = htons(IP_DF);
384 iph->ttl = 1;
385 iph->protocol = IPPROTO_IGMP;
386 iph->saddr = br->multicast_query_use_ifaddr ?
387 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
388 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
389 ((u8 *)&iph[1])[0] = IPOPT_RA;
390 ((u8 *)&iph[1])[1] = 4;
391 ((u8 *)&iph[1])[2] = 0;
392 ((u8 *)&iph[1])[3] = 0;
393 ip_send_check(iph);
394 skb_put(skb, 24);
395
396 skb_set_transport_header(skb, skb->len);
397 ih = igmp_hdr(skb);
398 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
399 ih->code = (group ? br->multicast_last_member_interval :
400 br->multicast_query_response_interval) /
401 (HZ / IGMP_TIMER_SCALE);
402 ih->group = group;
403 ih->csum = 0;
404 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
405 skb_put(skb, sizeof(*ih));
406
407 __skb_pull(skb, sizeof(*eth));
408
409 out:
410 return skb;
411 }
412
413 #if IS_ENABLED(CONFIG_IPV6)
414 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
415 const struct in6_addr *group)
416 {
417 struct sk_buff *skb;
418 struct ipv6hdr *ip6h;
419 struct mld_msg *mldq;
420 struct ethhdr *eth;
421 u8 *hopopt;
422 unsigned long interval;
423
424 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
425 8 + sizeof(*mldq));
426 if (!skb)
427 goto out;
428
429 skb->protocol = htons(ETH_P_IPV6);
430
431 /* Ethernet header */
432 skb_reset_mac_header(skb);
433 eth = eth_hdr(skb);
434
435 memcpy(eth->h_source, br->dev->dev_addr, 6);
436 eth->h_proto = htons(ETH_P_IPV6);
437 skb_put(skb, sizeof(*eth));
438
439 /* IPv6 header + HbH option */
440 skb_set_network_header(skb, skb->len);
441 ip6h = ipv6_hdr(skb);
442
443 *(__force __be32 *)ip6h = htonl(0x60000000);
444 ip6h->payload_len = htons(8 + sizeof(*mldq));
445 ip6h->nexthdr = IPPROTO_HOPOPTS;
446 ip6h->hop_limit = 1;
447 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
448 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
449 &ip6h->saddr)) {
450 kfree_skb(skb);
451 return NULL;
452 }
453 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
454
455 hopopt = (u8 *)(ip6h + 1);
456 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
457 hopopt[1] = 0; /* length of HbH */
458 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
459 hopopt[3] = 2; /* Length of RA Option */
460 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
461 hopopt[5] = 0;
462 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
463 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
464
465 skb_put(skb, sizeof(*ip6h) + 8);
466
467 /* ICMPv6 */
468 skb_set_transport_header(skb, skb->len);
469 mldq = (struct mld_msg *) icmp6_hdr(skb);
470
471 interval = ipv6_addr_any(group) ?
472 br->multicast_query_response_interval :
473 br->multicast_last_member_interval;
474
475 mldq->mld_type = ICMPV6_MGM_QUERY;
476 mldq->mld_code = 0;
477 mldq->mld_cksum = 0;
478 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
479 mldq->mld_reserved = 0;
480 mldq->mld_mca = *group;
481
482 /* checksum */
483 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
484 sizeof(*mldq), IPPROTO_ICMPV6,
485 csum_partial(mldq,
486 sizeof(*mldq), 0));
487 skb_put(skb, sizeof(*mldq));
488
489 __skb_pull(skb, sizeof(*eth));
490
491 out:
492 return skb;
493 }
494 #endif
495
496 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
497 struct br_ip *addr)
498 {
499 switch (addr->proto) {
500 case htons(ETH_P_IP):
501 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
502 #if IS_ENABLED(CONFIG_IPV6)
503 case htons(ETH_P_IPV6):
504 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
505 #endif
506 }
507 return NULL;
508 }
509
510 static struct net_bridge_mdb_entry *br_multicast_get_group(
511 struct net_bridge *br, struct net_bridge_port *port,
512 struct br_ip *group, int hash)
513 {
514 struct net_bridge_mdb_htable *mdb;
515 struct net_bridge_mdb_entry *mp;
516 unsigned int count = 0;
517 unsigned int max;
518 int elasticity;
519 int err;
520
521 mdb = rcu_dereference_protected(br->mdb, 1);
522 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
523 count++;
524 if (unlikely(br_ip_equal(group, &mp->addr)))
525 return mp;
526 }
527
528 elasticity = 0;
529 max = mdb->max;
530
531 if (unlikely(count > br->hash_elasticity && count)) {
532 if (net_ratelimit())
533 br_info(br, "Multicast hash table "
534 "chain limit reached: %s\n",
535 port ? port->dev->name : br->dev->name);
536
537 elasticity = br->hash_elasticity;
538 }
539
540 if (mdb->size >= max) {
541 max *= 2;
542 if (unlikely(max > br->hash_max)) {
543 br_warn(br, "Multicast hash table maximum of %d "
544 "reached, disabling snooping: %s\n",
545 br->hash_max,
546 port ? port->dev->name : br->dev->name);
547 err = -E2BIG;
548 disable:
549 br->multicast_disabled = 1;
550 goto err;
551 }
552 }
553
554 if (max > mdb->max || elasticity) {
555 if (mdb->old) {
556 if (net_ratelimit())
557 br_info(br, "Multicast hash table "
558 "on fire: %s\n",
559 port ? port->dev->name : br->dev->name);
560 err = -EEXIST;
561 goto err;
562 }
563
564 err = br_mdb_rehash(&br->mdb, max, elasticity);
565 if (err) {
566 br_warn(br, "Cannot rehash multicast "
567 "hash table, disabling snooping: %s, %d, %d\n",
568 port ? port->dev->name : br->dev->name,
569 mdb->size, err);
570 goto disable;
571 }
572
573 err = -EAGAIN;
574 goto err;
575 }
576
577 return NULL;
578
579 err:
580 mp = ERR_PTR(err);
581 return mp;
582 }
583
584 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
585 struct net_bridge_port *port, struct br_ip *group)
586 {
587 struct net_bridge_mdb_htable *mdb;
588 struct net_bridge_mdb_entry *mp;
589 int hash;
590 int err;
591
592 mdb = rcu_dereference_protected(br->mdb, 1);
593 if (!mdb) {
594 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
595 if (err)
596 return ERR_PTR(err);
597 goto rehash;
598 }
599
600 hash = br_ip_hash(mdb, group);
601 mp = br_multicast_get_group(br, port, group, hash);
602 switch (PTR_ERR(mp)) {
603 case 0:
604 break;
605
606 case -EAGAIN:
607 rehash:
608 mdb = rcu_dereference_protected(br->mdb, 1);
609 hash = br_ip_hash(mdb, group);
610 break;
611
612 default:
613 goto out;
614 }
615
616 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
617 if (unlikely(!mp))
618 return ERR_PTR(-ENOMEM);
619
620 mp->br = br;
621 mp->addr = *group;
622
623 setup_timer(&mp->timer, br_multicast_group_expired,
624 (unsigned long)mp);
625
626 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
627 mdb->size++;
628
629 out:
630 return mp;
631 }
632
633 struct net_bridge_port_group *br_multicast_new_port_group(
634 struct net_bridge_port *port,
635 struct br_ip *group,
636 struct net_bridge_port_group __rcu *next,
637 unsigned char state)
638 {
639 struct net_bridge_port_group *p;
640
641 p = kzalloc(sizeof(*p), GFP_ATOMIC);
642 if (unlikely(!p))
643 return NULL;
644
645 p->addr = *group;
646 p->port = port;
647 p->state = state;
648 rcu_assign_pointer(p->next, next);
649 hlist_add_head(&p->mglist, &port->mglist);
650 setup_timer(&p->timer, br_multicast_port_group_expired,
651 (unsigned long)p);
652 return p;
653 }
654
655 static int br_multicast_add_group(struct net_bridge *br,
656 struct net_bridge_port *port,
657 struct br_ip *group)
658 {
659 struct net_bridge_mdb_entry *mp;
660 struct net_bridge_port_group *p;
661 struct net_bridge_port_group __rcu **pp;
662 int err;
663
664 spin_lock(&br->multicast_lock);
665 if (!netif_running(br->dev) ||
666 (port && port->state == BR_STATE_DISABLED))
667 goto out;
668
669 mp = br_multicast_new_group(br, port, group);
670 err = PTR_ERR(mp);
671 if (IS_ERR(mp))
672 goto err;
673
674 if (!port) {
675 mp->mglist = true;
676 goto out;
677 }
678
679 for (pp = &mp->ports;
680 (p = mlock_dereference(*pp, br)) != NULL;
681 pp = &p->next) {
682 if (p->port == port)
683 goto out;
684 if ((unsigned long)p->port < (unsigned long)port)
685 break;
686 }
687
688 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
689 if (unlikely(!p))
690 goto err;
691 rcu_assign_pointer(*pp, p);
692 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
693
694 out:
695 err = 0;
696
697 err:
698 spin_unlock(&br->multicast_lock);
699 return err;
700 }
701
702 static int br_ip4_multicast_add_group(struct net_bridge *br,
703 struct net_bridge_port *port,
704 __be32 group,
705 __u16 vid)
706 {
707 struct br_ip br_group;
708
709 if (ipv4_is_local_multicast(group))
710 return 0;
711
712 br_group.u.ip4 = group;
713 br_group.proto = htons(ETH_P_IP);
714 br_group.vid = vid;
715
716 return br_multicast_add_group(br, port, &br_group);
717 }
718
719 #if IS_ENABLED(CONFIG_IPV6)
720 static int br_ip6_multicast_add_group(struct net_bridge *br,
721 struct net_bridge_port *port,
722 const struct in6_addr *group,
723 __u16 vid)
724 {
725 struct br_ip br_group;
726
727 if (ipv6_addr_is_ll_all_nodes(group))
728 return 0;
729
730 br_group.u.ip6 = *group;
731 br_group.proto = htons(ETH_P_IPV6);
732 br_group.vid = vid;
733
734 return br_multicast_add_group(br, port, &br_group);
735 }
736 #endif
737
738 static void br_multicast_router_expired(unsigned long data)
739 {
740 struct net_bridge_port *port = (void *)data;
741 struct net_bridge *br = port->br;
742
743 spin_lock(&br->multicast_lock);
744 if (port->multicast_router != 1 ||
745 timer_pending(&port->multicast_router_timer) ||
746 hlist_unhashed(&port->rlist))
747 goto out;
748
749 hlist_del_init_rcu(&port->rlist);
750
751 out:
752 spin_unlock(&br->multicast_lock);
753 }
754
755 static void br_multicast_local_router_expired(unsigned long data)
756 {
757 }
758
759 static void br_multicast_querier_expired(unsigned long data)
760 {
761 struct net_bridge *br = (void *)data;
762
763 spin_lock(&br->multicast_lock);
764 if (!netif_running(br->dev) || br->multicast_disabled)
765 goto out;
766
767 br_multicast_start_querier(br);
768
769 out:
770 spin_unlock(&br->multicast_lock);
771 }
772
773 static void __br_multicast_send_query(struct net_bridge *br,
774 struct net_bridge_port *port,
775 struct br_ip *ip)
776 {
777 struct sk_buff *skb;
778
779 skb = br_multicast_alloc_query(br, ip);
780 if (!skb)
781 return;
782
783 if (port) {
784 __skb_push(skb, sizeof(struct ethhdr));
785 skb->dev = port->dev;
786 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
787 dev_queue_xmit);
788 } else
789 netif_rx(skb);
790 }
791
792 static void br_multicast_send_query(struct net_bridge *br,
793 struct net_bridge_port *port, u32 sent)
794 {
795 unsigned long time;
796 struct br_ip br_group;
797
798 if (!netif_running(br->dev) || br->multicast_disabled ||
799 !br->multicast_querier ||
800 timer_pending(&br->multicast_querier_timer))
801 return;
802
803 memset(&br_group.u, 0, sizeof(br_group.u));
804
805 br_group.proto = htons(ETH_P_IP);
806 __br_multicast_send_query(br, port, &br_group);
807
808 #if IS_ENABLED(CONFIG_IPV6)
809 br_group.proto = htons(ETH_P_IPV6);
810 __br_multicast_send_query(br, port, &br_group);
811 #endif
812
813 time = jiffies;
814 time += sent < br->multicast_startup_query_count ?
815 br->multicast_startup_query_interval :
816 br->multicast_query_interval;
817 mod_timer(port ? &port->multicast_query_timer :
818 &br->multicast_query_timer, time);
819 }
820
821 static void br_multicast_port_query_expired(unsigned long data)
822 {
823 struct net_bridge_port *port = (void *)data;
824 struct net_bridge *br = port->br;
825
826 spin_lock(&br->multicast_lock);
827 if (port->state == BR_STATE_DISABLED ||
828 port->state == BR_STATE_BLOCKING)
829 goto out;
830
831 if (port->multicast_startup_queries_sent <
832 br->multicast_startup_query_count)
833 port->multicast_startup_queries_sent++;
834
835 br_multicast_send_query(port->br, port,
836 port->multicast_startup_queries_sent);
837
838 out:
839 spin_unlock(&br->multicast_lock);
840 }
841
842 void br_multicast_add_port(struct net_bridge_port *port)
843 {
844 port->multicast_router = 1;
845
846 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
847 (unsigned long)port);
848 setup_timer(&port->multicast_query_timer,
849 br_multicast_port_query_expired, (unsigned long)port);
850 }
851
852 void br_multicast_del_port(struct net_bridge_port *port)
853 {
854 del_timer_sync(&port->multicast_router_timer);
855 }
856
857 static void __br_multicast_enable_port(struct net_bridge_port *port)
858 {
859 port->multicast_startup_queries_sent = 0;
860
861 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
862 del_timer(&port->multicast_query_timer))
863 mod_timer(&port->multicast_query_timer, jiffies);
864 }
865
866 void br_multicast_enable_port(struct net_bridge_port *port)
867 {
868 struct net_bridge *br = port->br;
869
870 spin_lock(&br->multicast_lock);
871 if (br->multicast_disabled || !netif_running(br->dev))
872 goto out;
873
874 __br_multicast_enable_port(port);
875
876 out:
877 spin_unlock(&br->multicast_lock);
878 }
879
880 void br_multicast_disable_port(struct net_bridge_port *port)
881 {
882 struct net_bridge *br = port->br;
883 struct net_bridge_port_group *pg;
884 struct hlist_node *n;
885
886 spin_lock(&br->multicast_lock);
887 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
888 br_multicast_del_pg(br, pg);
889
890 if (!hlist_unhashed(&port->rlist))
891 hlist_del_init_rcu(&port->rlist);
892 del_timer(&port->multicast_router_timer);
893 del_timer(&port->multicast_query_timer);
894 spin_unlock(&br->multicast_lock);
895 }
896
897 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
898 struct net_bridge_port *port,
899 struct sk_buff *skb)
900 {
901 struct igmpv3_report *ih;
902 struct igmpv3_grec *grec;
903 int i;
904 int len;
905 int num;
906 int type;
907 int err = 0;
908 __be32 group;
909 u16 vid = 0;
910
911 if (!pskb_may_pull(skb, sizeof(*ih)))
912 return -EINVAL;
913
914 br_vlan_get_tag(skb, &vid);
915 ih = igmpv3_report_hdr(skb);
916 num = ntohs(ih->ngrec);
917 len = sizeof(*ih);
918
919 for (i = 0; i < num; i++) {
920 len += sizeof(*grec);
921 if (!pskb_may_pull(skb, len))
922 return -EINVAL;
923
924 grec = (void *)(skb->data + len - sizeof(*grec));
925 group = grec->grec_mca;
926 type = grec->grec_type;
927
928 len += ntohs(grec->grec_nsrcs) * 4;
929 if (!pskb_may_pull(skb, len))
930 return -EINVAL;
931
932 /* We treat this as an IGMPv2 report for now. */
933 switch (type) {
934 case IGMPV3_MODE_IS_INCLUDE:
935 case IGMPV3_MODE_IS_EXCLUDE:
936 case IGMPV3_CHANGE_TO_INCLUDE:
937 case IGMPV3_CHANGE_TO_EXCLUDE:
938 case IGMPV3_ALLOW_NEW_SOURCES:
939 case IGMPV3_BLOCK_OLD_SOURCES:
940 break;
941
942 default:
943 continue;
944 }
945
946 err = br_ip4_multicast_add_group(br, port, group, vid);
947 if (err)
948 break;
949 }
950
951 return err;
952 }
953
954 #if IS_ENABLED(CONFIG_IPV6)
955 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
956 struct net_bridge_port *port,
957 struct sk_buff *skb)
958 {
959 struct icmp6hdr *icmp6h;
960 struct mld2_grec *grec;
961 int i;
962 int len;
963 int num;
964 int err = 0;
965 u16 vid = 0;
966
967 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
968 return -EINVAL;
969
970 br_vlan_get_tag(skb, &vid);
971 icmp6h = icmp6_hdr(skb);
972 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
973 len = sizeof(*icmp6h);
974
975 for (i = 0; i < num; i++) {
976 __be16 *nsrcs, _nsrcs;
977
978 nsrcs = skb_header_pointer(skb,
979 len + offsetof(struct mld2_grec,
980 grec_nsrcs),
981 sizeof(_nsrcs), &_nsrcs);
982 if (!nsrcs)
983 return -EINVAL;
984
985 if (!pskb_may_pull(skb,
986 len + sizeof(*grec) +
987 sizeof(struct in6_addr) * ntohs(*nsrcs)))
988 return -EINVAL;
989
990 grec = (struct mld2_grec *)(skb->data + len);
991 len += sizeof(*grec) +
992 sizeof(struct in6_addr) * ntohs(*nsrcs);
993
994 /* We treat these as MLDv1 reports for now. */
995 switch (grec->grec_type) {
996 case MLD2_MODE_IS_INCLUDE:
997 case MLD2_MODE_IS_EXCLUDE:
998 case MLD2_CHANGE_TO_INCLUDE:
999 case MLD2_CHANGE_TO_EXCLUDE:
1000 case MLD2_ALLOW_NEW_SOURCES:
1001 case MLD2_BLOCK_OLD_SOURCES:
1002 break;
1003
1004 default:
1005 continue;
1006 }
1007
1008 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
1009 vid);
1010 if (!err)
1011 break;
1012 }
1013
1014 return err;
1015 }
1016 #endif
1017
1018 static void br_multicast_update_querier_timer(struct net_bridge *br,
1019 unsigned long max_delay)
1020 {
1021 if (!timer_pending(&br->multicast_querier_timer))
1022 br->multicast_querier_delay_time = jiffies + max_delay;
1023
1024 mod_timer(&br->multicast_querier_timer,
1025 jiffies + br->multicast_querier_interval);
1026 }
1027
1028 /*
1029 * Add port to router_list
1030 * list is maintained ordered by pointer value
1031 * and locked by br->multicast_lock and RCU
1032 */
1033 static void br_multicast_add_router(struct net_bridge *br,
1034 struct net_bridge_port *port)
1035 {
1036 struct net_bridge_port *p;
1037 struct hlist_node *slot = NULL;
1038
1039 hlist_for_each_entry(p, &br->router_list, rlist) {
1040 if ((unsigned long) port >= (unsigned long) p)
1041 break;
1042 slot = &p->rlist;
1043 }
1044
1045 if (slot)
1046 hlist_add_after_rcu(slot, &port->rlist);
1047 else
1048 hlist_add_head_rcu(&port->rlist, &br->router_list);
1049 }
1050
1051 static void br_multicast_mark_router(struct net_bridge *br,
1052 struct net_bridge_port *port)
1053 {
1054 unsigned long now = jiffies;
1055
1056 if (!port) {
1057 if (br->multicast_router == 1)
1058 mod_timer(&br->multicast_router_timer,
1059 now + br->multicast_querier_interval);
1060 return;
1061 }
1062
1063 if (port->multicast_router != 1)
1064 return;
1065
1066 if (!hlist_unhashed(&port->rlist))
1067 goto timer;
1068
1069 br_multicast_add_router(br, port);
1070
1071 timer:
1072 mod_timer(&port->multicast_router_timer,
1073 now + br->multicast_querier_interval);
1074 }
1075
1076 static void br_multicast_query_received(struct net_bridge *br,
1077 struct net_bridge_port *port,
1078 int saddr,
1079 unsigned long max_delay)
1080 {
1081 if (saddr)
1082 br_multicast_update_querier_timer(br, max_delay);
1083 else if (timer_pending(&br->multicast_querier_timer))
1084 return;
1085
1086 br_multicast_mark_router(br, port);
1087 }
1088
1089 static int br_ip4_multicast_query(struct net_bridge *br,
1090 struct net_bridge_port *port,
1091 struct sk_buff *skb)
1092 {
1093 const struct iphdr *iph = ip_hdr(skb);
1094 struct igmphdr *ih = igmp_hdr(skb);
1095 struct net_bridge_mdb_entry *mp;
1096 struct igmpv3_query *ih3;
1097 struct net_bridge_port_group *p;
1098 struct net_bridge_port_group __rcu **pp;
1099 unsigned long max_delay;
1100 unsigned long now = jiffies;
1101 __be32 group;
1102 int err = 0;
1103 u16 vid = 0;
1104
1105 spin_lock(&br->multicast_lock);
1106 if (!netif_running(br->dev) ||
1107 (port && port->state == BR_STATE_DISABLED))
1108 goto out;
1109
1110 group = ih->group;
1111
1112 if (skb->len == sizeof(*ih)) {
1113 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1114
1115 if (!max_delay) {
1116 max_delay = 10 * HZ;
1117 group = 0;
1118 }
1119 } else {
1120 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1121 err = -EINVAL;
1122 goto out;
1123 }
1124
1125 ih3 = igmpv3_query_hdr(skb);
1126 if (ih3->nsrcs)
1127 goto out;
1128
1129 max_delay = ih3->code ?
1130 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1131 }
1132
1133 br_multicast_query_received(br, port, !!iph->saddr, max_delay);
1134
1135 if (!group)
1136 goto out;
1137
1138 br_vlan_get_tag(skb, &vid);
1139 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1140 if (!mp)
1141 goto out;
1142
1143 mod_timer(&mp->timer, now + br->multicast_membership_interval);
1144 mp->timer_armed = true;
1145
1146 max_delay *= br->multicast_last_member_count;
1147
1148 if (mp->mglist &&
1149 (timer_pending(&mp->timer) ?
1150 time_after(mp->timer.expires, now + max_delay) :
1151 try_to_del_timer_sync(&mp->timer) >= 0))
1152 mod_timer(&mp->timer, now + max_delay);
1153
1154 for (pp = &mp->ports;
1155 (p = mlock_dereference(*pp, br)) != NULL;
1156 pp = &p->next) {
1157 if (timer_pending(&p->timer) ?
1158 time_after(p->timer.expires, now + max_delay) :
1159 try_to_del_timer_sync(&p->timer) >= 0)
1160 mod_timer(&p->timer, now + max_delay);
1161 }
1162
1163 out:
1164 spin_unlock(&br->multicast_lock);
1165 return err;
1166 }
1167
1168 #if IS_ENABLED(CONFIG_IPV6)
1169 static int br_ip6_multicast_query(struct net_bridge *br,
1170 struct net_bridge_port *port,
1171 struct sk_buff *skb)
1172 {
1173 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1174 struct mld_msg *mld;
1175 struct net_bridge_mdb_entry *mp;
1176 struct mld2_query *mld2q;
1177 struct net_bridge_port_group *p;
1178 struct net_bridge_port_group __rcu **pp;
1179 unsigned long max_delay;
1180 unsigned long now = jiffies;
1181 const struct in6_addr *group = NULL;
1182 int err = 0;
1183 u16 vid = 0;
1184
1185 spin_lock(&br->multicast_lock);
1186 if (!netif_running(br->dev) ||
1187 (port && port->state == BR_STATE_DISABLED))
1188 goto out;
1189
1190 if (skb->len == sizeof(*mld)) {
1191 if (!pskb_may_pull(skb, sizeof(*mld))) {
1192 err = -EINVAL;
1193 goto out;
1194 }
1195 mld = (struct mld_msg *) icmp6_hdr(skb);
1196 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1197 if (max_delay)
1198 group = &mld->mld_mca;
1199 } else {
1200 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1201 err = -EINVAL;
1202 goto out;
1203 }
1204 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1205 if (!mld2q->mld2q_nsrcs)
1206 group = &mld2q->mld2q_mca;
1207
1208 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1209 }
1210
1211 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr),
1212 max_delay);
1213
1214 if (!group)
1215 goto out;
1216
1217 br_vlan_get_tag(skb, &vid);
1218 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1219 if (!mp)
1220 goto out;
1221
1222 mod_timer(&mp->timer, now + br->multicast_membership_interval);
1223 mp->timer_armed = true;
1224
1225 max_delay *= br->multicast_last_member_count;
1226 if (mp->mglist &&
1227 (timer_pending(&mp->timer) ?
1228 time_after(mp->timer.expires, now + max_delay) :
1229 try_to_del_timer_sync(&mp->timer) >= 0))
1230 mod_timer(&mp->timer, now + max_delay);
1231
1232 for (pp = &mp->ports;
1233 (p = mlock_dereference(*pp, br)) != NULL;
1234 pp = &p->next) {
1235 if (timer_pending(&p->timer) ?
1236 time_after(p->timer.expires, now + max_delay) :
1237 try_to_del_timer_sync(&p->timer) >= 0)
1238 mod_timer(&p->timer, now + max_delay);
1239 }
1240
1241 out:
1242 spin_unlock(&br->multicast_lock);
1243 return err;
1244 }
1245 #endif
1246
1247 static void br_multicast_leave_group(struct net_bridge *br,
1248 struct net_bridge_port *port,
1249 struct br_ip *group)
1250 {
1251 struct net_bridge_mdb_htable *mdb;
1252 struct net_bridge_mdb_entry *mp;
1253 struct net_bridge_port_group *p;
1254 unsigned long now;
1255 unsigned long time;
1256
1257 spin_lock(&br->multicast_lock);
1258 if (!netif_running(br->dev) ||
1259 (port && port->state == BR_STATE_DISABLED) ||
1260 timer_pending(&br->multicast_querier_timer))
1261 goto out;
1262
1263 mdb = mlock_dereference(br->mdb, br);
1264 mp = br_mdb_ip_get(mdb, group);
1265 if (!mp)
1266 goto out;
1267
1268 if (br->multicast_querier &&
1269 !timer_pending(&br->multicast_querier_timer)) {
1270 __br_multicast_send_query(br, port, &mp->addr);
1271
1272 time = jiffies + br->multicast_last_member_count *
1273 br->multicast_last_member_interval;
1274 mod_timer(port ? &port->multicast_query_timer :
1275 &br->multicast_query_timer, time);
1276
1277 for (p = mlock_dereference(mp->ports, br);
1278 p != NULL;
1279 p = mlock_dereference(p->next, br)) {
1280 if (p->port != port)
1281 continue;
1282
1283 if (!hlist_unhashed(&p->mglist) &&
1284 (timer_pending(&p->timer) ?
1285 time_after(p->timer.expires, time) :
1286 try_to_del_timer_sync(&p->timer) >= 0)) {
1287 mod_timer(&p->timer, time);
1288 }
1289
1290 break;
1291 }
1292 }
1293
1294 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1295 struct net_bridge_port_group __rcu **pp;
1296
1297 for (pp = &mp->ports;
1298 (p = mlock_dereference(*pp, br)) != NULL;
1299 pp = &p->next) {
1300 if (p->port != port)
1301 continue;
1302
1303 rcu_assign_pointer(*pp, p->next);
1304 hlist_del_init(&p->mglist);
1305 del_timer(&p->timer);
1306 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1307 br_mdb_notify(br->dev, port, group, RTM_DELMDB);
1308
1309 if (!mp->ports && !mp->mglist && mp->timer_armed &&
1310 netif_running(br->dev))
1311 mod_timer(&mp->timer, jiffies);
1312 }
1313 goto out;
1314 }
1315
1316 now = jiffies;
1317 time = now + br->multicast_last_member_count *
1318 br->multicast_last_member_interval;
1319
1320 if (!port) {
1321 if (mp->mglist && mp->timer_armed &&
1322 (timer_pending(&mp->timer) ?
1323 time_after(mp->timer.expires, time) :
1324 try_to_del_timer_sync(&mp->timer) >= 0)) {
1325 mod_timer(&mp->timer, time);
1326 }
1327 }
1328
1329 out:
1330 spin_unlock(&br->multicast_lock);
1331 }
1332
1333 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1334 struct net_bridge_port *port,
1335 __be32 group,
1336 __u16 vid)
1337 {
1338 struct br_ip br_group;
1339
1340 if (ipv4_is_local_multicast(group))
1341 return;
1342
1343 br_group.u.ip4 = group;
1344 br_group.proto = htons(ETH_P_IP);
1345 br_group.vid = vid;
1346
1347 br_multicast_leave_group(br, port, &br_group);
1348 }
1349
1350 #if IS_ENABLED(CONFIG_IPV6)
1351 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1352 struct net_bridge_port *port,
1353 const struct in6_addr *group,
1354 __u16 vid)
1355 {
1356 struct br_ip br_group;
1357
1358 if (ipv6_addr_is_ll_all_nodes(group))
1359 return;
1360
1361 br_group.u.ip6 = *group;
1362 br_group.proto = htons(ETH_P_IPV6);
1363 br_group.vid = vid;
1364
1365 br_multicast_leave_group(br, port, &br_group);
1366 }
1367 #endif
1368
1369 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1370 struct net_bridge_port *port,
1371 struct sk_buff *skb)
1372 {
1373 struct sk_buff *skb2 = skb;
1374 const struct iphdr *iph;
1375 struct igmphdr *ih;
1376 unsigned int len;
1377 unsigned int offset;
1378 int err;
1379 u16 vid = 0;
1380
1381 /* We treat OOM as packet loss for now. */
1382 if (!pskb_may_pull(skb, sizeof(*iph)))
1383 return -EINVAL;
1384
1385 iph = ip_hdr(skb);
1386
1387 if (iph->ihl < 5 || iph->version != 4)
1388 return -EINVAL;
1389
1390 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1391 return -EINVAL;
1392
1393 iph = ip_hdr(skb);
1394
1395 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1396 return -EINVAL;
1397
1398 if (iph->protocol != IPPROTO_IGMP) {
1399 if (!ipv4_is_local_multicast(iph->daddr))
1400 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1401 return 0;
1402 }
1403
1404 len = ntohs(iph->tot_len);
1405 if (skb->len < len || len < ip_hdrlen(skb))
1406 return -EINVAL;
1407
1408 if (skb->len > len) {
1409 skb2 = skb_clone(skb, GFP_ATOMIC);
1410 if (!skb2)
1411 return -ENOMEM;
1412
1413 err = pskb_trim_rcsum(skb2, len);
1414 if (err)
1415 goto err_out;
1416 }
1417
1418 len -= ip_hdrlen(skb2);
1419 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1420 __skb_pull(skb2, offset);
1421 skb_reset_transport_header(skb2);
1422
1423 err = -EINVAL;
1424 if (!pskb_may_pull(skb2, sizeof(*ih)))
1425 goto out;
1426
1427 switch (skb2->ip_summed) {
1428 case CHECKSUM_COMPLETE:
1429 if (!csum_fold(skb2->csum))
1430 break;
1431 /* fall through */
1432 case CHECKSUM_NONE:
1433 skb2->csum = 0;
1434 if (skb_checksum_complete(skb2))
1435 goto out;
1436 }
1437
1438 err = 0;
1439
1440 br_vlan_get_tag(skb2, &vid);
1441 BR_INPUT_SKB_CB(skb)->igmp = 1;
1442 ih = igmp_hdr(skb2);
1443
1444 switch (ih->type) {
1445 case IGMP_HOST_MEMBERSHIP_REPORT:
1446 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1447 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1448 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1449 break;
1450 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1451 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1452 break;
1453 case IGMP_HOST_MEMBERSHIP_QUERY:
1454 err = br_ip4_multicast_query(br, port, skb2);
1455 break;
1456 case IGMP_HOST_LEAVE_MESSAGE:
1457 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1458 break;
1459 }
1460
1461 out:
1462 __skb_push(skb2, offset);
1463 err_out:
1464 if (skb2 != skb)
1465 kfree_skb(skb2);
1466 return err;
1467 }
1468
1469 #if IS_ENABLED(CONFIG_IPV6)
1470 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1471 struct net_bridge_port *port,
1472 struct sk_buff *skb)
1473 {
1474 struct sk_buff *skb2;
1475 const struct ipv6hdr *ip6h;
1476 u8 icmp6_type;
1477 u8 nexthdr;
1478 __be16 frag_off;
1479 unsigned int len;
1480 int offset;
1481 int err;
1482 u16 vid = 0;
1483
1484 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1485 return -EINVAL;
1486
1487 ip6h = ipv6_hdr(skb);
1488
1489 /*
1490 * We're interested in MLD messages only.
1491 * - Version is 6
1492 * - MLD has always Router Alert hop-by-hop option
1493 * - But we do not support jumbrograms.
1494 */
1495 if (ip6h->version != 6)
1496 return 0;
1497
1498 /* Prevent flooding this packet if there is no listener present */
1499 if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
1500 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1501
1502 if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
1503 ip6h->payload_len == 0)
1504 return 0;
1505
1506 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1507 if (skb->len < len)
1508 return -EINVAL;
1509
1510 nexthdr = ip6h->nexthdr;
1511 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
1512
1513 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1514 return 0;
1515
1516 /* Okay, we found ICMPv6 header */
1517 skb2 = skb_clone(skb, GFP_ATOMIC);
1518 if (!skb2)
1519 return -ENOMEM;
1520
1521 err = -EINVAL;
1522 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1523 goto out;
1524
1525 len -= offset - skb_network_offset(skb2);
1526
1527 __skb_pull(skb2, offset);
1528 skb_reset_transport_header(skb2);
1529 skb_postpull_rcsum(skb2, skb_network_header(skb2),
1530 skb_network_header_len(skb2));
1531
1532 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1533
1534 switch (icmp6_type) {
1535 case ICMPV6_MGM_QUERY:
1536 case ICMPV6_MGM_REPORT:
1537 case ICMPV6_MGM_REDUCTION:
1538 case ICMPV6_MLD2_REPORT:
1539 break;
1540 default:
1541 err = 0;
1542 goto out;
1543 }
1544
1545 /* Okay, we found MLD message. Check further. */
1546 if (skb2->len > len) {
1547 err = pskb_trim_rcsum(skb2, len);
1548 if (err)
1549 goto out;
1550 err = -EINVAL;
1551 }
1552
1553 ip6h = ipv6_hdr(skb2);
1554
1555 switch (skb2->ip_summed) {
1556 case CHECKSUM_COMPLETE:
1557 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1558 IPPROTO_ICMPV6, skb2->csum))
1559 break;
1560 /*FALLTHROUGH*/
1561 case CHECKSUM_NONE:
1562 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1563 &ip6h->daddr,
1564 skb2->len,
1565 IPPROTO_ICMPV6, 0));
1566 if (__skb_checksum_complete(skb2))
1567 goto out;
1568 }
1569
1570 err = 0;
1571
1572 br_vlan_get_tag(skb, &vid);
1573 BR_INPUT_SKB_CB(skb)->igmp = 1;
1574
1575 switch (icmp6_type) {
1576 case ICMPV6_MGM_REPORT:
1577 {
1578 struct mld_msg *mld;
1579 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1580 err = -EINVAL;
1581 goto out;
1582 }
1583 mld = (struct mld_msg *)skb_transport_header(skb2);
1584 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1585 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1586 break;
1587 }
1588 case ICMPV6_MLD2_REPORT:
1589 err = br_ip6_multicast_mld2_report(br, port, skb2);
1590 break;
1591 case ICMPV6_MGM_QUERY:
1592 err = br_ip6_multicast_query(br, port, skb2);
1593 break;
1594 case ICMPV6_MGM_REDUCTION:
1595 {
1596 struct mld_msg *mld;
1597 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1598 err = -EINVAL;
1599 goto out;
1600 }
1601 mld = (struct mld_msg *)skb_transport_header(skb2);
1602 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1603 }
1604 }
1605
1606 out:
1607 kfree_skb(skb2);
1608 return err;
1609 }
1610 #endif
1611
1612 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1613 struct sk_buff *skb)
1614 {
1615 BR_INPUT_SKB_CB(skb)->igmp = 0;
1616 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1617
1618 if (br->multicast_disabled)
1619 return 0;
1620
1621 switch (skb->protocol) {
1622 case htons(ETH_P_IP):
1623 return br_multicast_ipv4_rcv(br, port, skb);
1624 #if IS_ENABLED(CONFIG_IPV6)
1625 case htons(ETH_P_IPV6):
1626 return br_multicast_ipv6_rcv(br, port, skb);
1627 #endif
1628 }
1629
1630 return 0;
1631 }
1632
1633 static void br_multicast_query_expired(unsigned long data)
1634 {
1635 struct net_bridge *br = (void *)data;
1636
1637 spin_lock(&br->multicast_lock);
1638 if (br->multicast_startup_queries_sent <
1639 br->multicast_startup_query_count)
1640 br->multicast_startup_queries_sent++;
1641
1642 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1643
1644 spin_unlock(&br->multicast_lock);
1645 }
1646
1647 void br_multicast_init(struct net_bridge *br)
1648 {
1649 br->hash_elasticity = 4;
1650 br->hash_max = 512;
1651
1652 br->multicast_router = 1;
1653 br->multicast_querier = 0;
1654 br->multicast_query_use_ifaddr = 0;
1655 br->multicast_last_member_count = 2;
1656 br->multicast_startup_query_count = 2;
1657
1658 br->multicast_last_member_interval = HZ;
1659 br->multicast_query_response_interval = 10 * HZ;
1660 br->multicast_startup_query_interval = 125 * HZ / 4;
1661 br->multicast_query_interval = 125 * HZ;
1662 br->multicast_querier_interval = 255 * HZ;
1663 br->multicast_membership_interval = 260 * HZ;
1664
1665 br->multicast_querier_delay_time = 0;
1666
1667 spin_lock_init(&br->multicast_lock);
1668 setup_timer(&br->multicast_router_timer,
1669 br_multicast_local_router_expired, 0);
1670 setup_timer(&br->multicast_querier_timer,
1671 br_multicast_querier_expired, (unsigned long)br);
1672 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1673 (unsigned long)br);
1674 }
1675
1676 void br_multicast_open(struct net_bridge *br)
1677 {
1678 br->multicast_startup_queries_sent = 0;
1679
1680 if (br->multicast_disabled)
1681 return;
1682
1683 mod_timer(&br->multicast_query_timer, jiffies);
1684 }
1685
1686 void br_multicast_stop(struct net_bridge *br)
1687 {
1688 struct net_bridge_mdb_htable *mdb;
1689 struct net_bridge_mdb_entry *mp;
1690 struct hlist_node *n;
1691 u32 ver;
1692 int i;
1693
1694 del_timer_sync(&br->multicast_router_timer);
1695 del_timer_sync(&br->multicast_querier_timer);
1696 del_timer_sync(&br->multicast_query_timer);
1697
1698 spin_lock_bh(&br->multicast_lock);
1699 mdb = mlock_dereference(br->mdb, br);
1700 if (!mdb)
1701 goto out;
1702
1703 br->mdb = NULL;
1704
1705 ver = mdb->ver;
1706 for (i = 0; i < mdb->max; i++) {
1707 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1708 hlist[ver]) {
1709 del_timer(&mp->timer);
1710 mp->timer_armed = false;
1711 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1712 }
1713 }
1714
1715 if (mdb->old) {
1716 spin_unlock_bh(&br->multicast_lock);
1717 rcu_barrier_bh();
1718 spin_lock_bh(&br->multicast_lock);
1719 WARN_ON(mdb->old);
1720 }
1721
1722 mdb->old = mdb;
1723 call_rcu_bh(&mdb->rcu, br_mdb_free);
1724
1725 out:
1726 spin_unlock_bh(&br->multicast_lock);
1727 }
1728
1729 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1730 {
1731 int err = -ENOENT;
1732
1733 spin_lock_bh(&br->multicast_lock);
1734 if (!netif_running(br->dev))
1735 goto unlock;
1736
1737 switch (val) {
1738 case 0:
1739 case 2:
1740 del_timer(&br->multicast_router_timer);
1741 /* fall through */
1742 case 1:
1743 br->multicast_router = val;
1744 err = 0;
1745 break;
1746
1747 default:
1748 err = -EINVAL;
1749 break;
1750 }
1751
1752 unlock:
1753 spin_unlock_bh(&br->multicast_lock);
1754
1755 return err;
1756 }
1757
1758 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1759 {
1760 struct net_bridge *br = p->br;
1761 int err = -ENOENT;
1762
1763 spin_lock(&br->multicast_lock);
1764 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1765 goto unlock;
1766
1767 switch (val) {
1768 case 0:
1769 case 1:
1770 case 2:
1771 p->multicast_router = val;
1772 err = 0;
1773
1774 if (val < 2 && !hlist_unhashed(&p->rlist))
1775 hlist_del_init_rcu(&p->rlist);
1776
1777 if (val == 1)
1778 break;
1779
1780 del_timer(&p->multicast_router_timer);
1781
1782 if (val == 0)
1783 break;
1784
1785 br_multicast_add_router(br, p);
1786 break;
1787
1788 default:
1789 err = -EINVAL;
1790 break;
1791 }
1792
1793 unlock:
1794 spin_unlock(&br->multicast_lock);
1795
1796 return err;
1797 }
1798
1799 static void br_multicast_start_querier(struct net_bridge *br)
1800 {
1801 struct net_bridge_port *port;
1802
1803 br_multicast_open(br);
1804
1805 list_for_each_entry(port, &br->port_list, list) {
1806 if (port->state == BR_STATE_DISABLED ||
1807 port->state == BR_STATE_BLOCKING)
1808 continue;
1809
1810 __br_multicast_enable_port(port);
1811 }
1812 }
1813
1814 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1815 {
1816 int err = 0;
1817 struct net_bridge_mdb_htable *mdb;
1818
1819 spin_lock_bh(&br->multicast_lock);
1820 if (br->multicast_disabled == !val)
1821 goto unlock;
1822
1823 br->multicast_disabled = !val;
1824 if (br->multicast_disabled)
1825 goto unlock;
1826
1827 if (!netif_running(br->dev))
1828 goto unlock;
1829
1830 mdb = mlock_dereference(br->mdb, br);
1831 if (mdb) {
1832 if (mdb->old) {
1833 err = -EEXIST;
1834 rollback:
1835 br->multicast_disabled = !!val;
1836 goto unlock;
1837 }
1838
1839 err = br_mdb_rehash(&br->mdb, mdb->max,
1840 br->hash_elasticity);
1841 if (err)
1842 goto rollback;
1843 }
1844
1845 br_multicast_start_querier(br);
1846
1847 unlock:
1848 spin_unlock_bh(&br->multicast_lock);
1849
1850 return err;
1851 }
1852
1853 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1854 {
1855 unsigned long max_delay;
1856
1857 val = !!val;
1858
1859 spin_lock_bh(&br->multicast_lock);
1860 if (br->multicast_querier == val)
1861 goto unlock;
1862
1863 br->multicast_querier = val;
1864 if (!val)
1865 goto unlock;
1866
1867 max_delay = br->multicast_query_response_interval;
1868 if (!timer_pending(&br->multicast_querier_timer))
1869 br->multicast_querier_delay_time = jiffies + max_delay;
1870
1871 br_multicast_start_querier(br);
1872
1873 unlock:
1874 spin_unlock_bh(&br->multicast_lock);
1875
1876 return 0;
1877 }
1878
1879 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1880 {
1881 int err = -ENOENT;
1882 u32 old;
1883 struct net_bridge_mdb_htable *mdb;
1884
1885 spin_lock(&br->multicast_lock);
1886 if (!netif_running(br->dev))
1887 goto unlock;
1888
1889 err = -EINVAL;
1890 if (!is_power_of_2(val))
1891 goto unlock;
1892
1893 mdb = mlock_dereference(br->mdb, br);
1894 if (mdb && val < mdb->size)
1895 goto unlock;
1896
1897 err = 0;
1898
1899 old = br->hash_max;
1900 br->hash_max = val;
1901
1902 if (mdb) {
1903 if (mdb->old) {
1904 err = -EEXIST;
1905 rollback:
1906 br->hash_max = old;
1907 goto unlock;
1908 }
1909
1910 err = br_mdb_rehash(&br->mdb, br->hash_max,
1911 br->hash_elasticity);
1912 if (err)
1913 goto rollback;
1914 }
1915
1916 unlock:
1917 spin_unlock(&br->multicast_lock);
1918
1919 return err;
1920 }
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