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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 <net/ip.h>
27#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
28#include <net/ipv6.h>
29#include <net/mld.h>
30#include <net/addrconf.h>
31#include <net/ip6_checksum.h>
32#endif
33
34#include "br_private.h"
35
36#define mlock_dereference(X, br) \
37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
38
39#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
41{
42 if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
43 return 1;
44 return 0;
45}
46#endif
47
48static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
49{
50 if (a->proto != b->proto)
51 return 0;
52 switch (a->proto) {
53 case htons(ETH_P_IP):
54 return a->u.ip4 == b->u.ip4;
55#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
56 case htons(ETH_P_IPV6):
57 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
58#endif
59 }
60 return 0;
61}
62
63static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
64{
65 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
66}
67
68#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
69static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
70 const struct in6_addr *ip)
71{
72 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
73}
74#endif
75
76static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
77 struct br_ip *ip)
78{
79 switch (ip->proto) {
80 case htons(ETH_P_IP):
81 return __br_ip4_hash(mdb, ip->u.ip4);
82#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
83 case htons(ETH_P_IPV6):
84 return __br_ip6_hash(mdb, &ip->u.ip6);
85#endif
86 }
87 return 0;
88}
89
90static struct net_bridge_mdb_entry *__br_mdb_ip_get(
91 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
92{
93 struct net_bridge_mdb_entry *mp;
94 struct hlist_node *p;
95
96 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
97 if (br_ip_equal(&mp->addr, dst))
98 return mp;
99 }
100
101 return NULL;
102}
103
104static struct net_bridge_mdb_entry *br_mdb_ip_get(
105 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
106{
107 if (!mdb)
108 return NULL;
109
110 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
111}
112
113static struct net_bridge_mdb_entry *br_mdb_ip4_get(
114 struct net_bridge_mdb_htable *mdb, __be32 dst)
115{
116 struct br_ip br_dst;
117
118 br_dst.u.ip4 = dst;
119 br_dst.proto = htons(ETH_P_IP);
120
121 return br_mdb_ip_get(mdb, &br_dst);
122}
123
124#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
125static struct net_bridge_mdb_entry *br_mdb_ip6_get(
126 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
127{
128 struct br_ip br_dst;
129
130 ipv6_addr_copy(&br_dst.u.ip6, dst);
131 br_dst.proto = htons(ETH_P_IPV6);
132
133 return br_mdb_ip_get(mdb, &br_dst);
134}
135#endif
136
137struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
138 struct sk_buff *skb)
139{
140 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
141 struct br_ip ip;
142
143 if (br->multicast_disabled)
144 return NULL;
145
146 if (BR_INPUT_SKB_CB(skb)->igmp)
147 return NULL;
148
149 ip.proto = skb->protocol;
150
151 switch (skb->protocol) {
152 case htons(ETH_P_IP):
153 ip.u.ip4 = ip_hdr(skb)->daddr;
154 break;
155#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
156 case htons(ETH_P_IPV6):
157 ipv6_addr_copy(&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
167static 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
178static 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 struct hlist_node *p;
184 int maxlen;
185 int len;
186 int i;
187
188 for (i = 0; i < old->max; i++)
189 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
190 hlist_add_head(&mp->hlist[new->ver],
191 &new->mhash[br_ip_hash(new, &mp->addr)]);
192
193 if (!elasticity)
194 return 0;
195
196 maxlen = 0;
197 for (i = 0; i < new->max; i++) {
198 len = 0;
199 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
200 len++;
201 if (len > maxlen)
202 maxlen = len;
203 }
204
205 return maxlen > elasticity ? -EINVAL : 0;
206}
207
208static void br_multicast_free_pg(struct rcu_head *head)
209{
210 struct net_bridge_port_group *p =
211 container_of(head, struct net_bridge_port_group, rcu);
212
213 kfree(p);
214}
215
216static void br_multicast_free_group(struct rcu_head *head)
217{
218 struct net_bridge_mdb_entry *mp =
219 container_of(head, struct net_bridge_mdb_entry, rcu);
220
221 kfree(mp);
222}
223
224static void br_multicast_group_expired(unsigned long data)
225{
226 struct net_bridge_mdb_entry *mp = (void *)data;
227 struct net_bridge *br = mp->br;
228 struct net_bridge_mdb_htable *mdb;
229
230 spin_lock(&br->multicast_lock);
231 if (!netif_running(br->dev) || timer_pending(&mp->timer))
232 goto out;
233
234 mp->mglist = false;
235
236 if (mp->ports)
237 goto out;
238
239 mdb = mlock_dereference(br->mdb, br);
240
241 hlist_del_rcu(&mp->hlist[mdb->ver]);
242 mdb->size--;
243
244 del_timer(&mp->query_timer);
245 call_rcu_bh(&mp->rcu, br_multicast_free_group);
246
247out:
248 spin_unlock(&br->multicast_lock);
249}
250
251static void br_multicast_del_pg(struct net_bridge *br,
252 struct net_bridge_port_group *pg)
253{
254 struct net_bridge_mdb_htable *mdb;
255 struct net_bridge_mdb_entry *mp;
256 struct net_bridge_port_group *p;
257 struct net_bridge_port_group __rcu **pp;
258
259 mdb = mlock_dereference(br->mdb, br);
260
261 mp = br_mdb_ip_get(mdb, &pg->addr);
262 if (WARN_ON(!mp))
263 return;
264
265 for (pp = &mp->ports;
266 (p = mlock_dereference(*pp, br)) != NULL;
267 pp = &p->next) {
268 if (p != pg)
269 continue;
270
271 rcu_assign_pointer(*pp, p->next);
272 hlist_del_init(&p->mglist);
273 del_timer(&p->timer);
274 del_timer(&p->query_timer);
275 call_rcu_bh(&p->rcu, br_multicast_free_pg);
276
277 if (!mp->ports && !mp->mglist &&
278 netif_running(br->dev))
279 mod_timer(&mp->timer, jiffies);
280
281 return;
282 }
283
284 WARN_ON(1);
285}
286
287static void br_multicast_port_group_expired(unsigned long data)
288{
289 struct net_bridge_port_group *pg = (void *)data;
290 struct net_bridge *br = pg->port->br;
291
292 spin_lock(&br->multicast_lock);
293 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
294 hlist_unhashed(&pg->mglist))
295 goto out;
296
297 br_multicast_del_pg(br, pg);
298
299out:
300 spin_unlock(&br->multicast_lock);
301}
302
303static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
304 int elasticity)
305{
306 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
307 struct net_bridge_mdb_htable *mdb;
308 int err;
309
310 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
311 if (!mdb)
312 return -ENOMEM;
313
314 mdb->max = max;
315 mdb->old = old;
316
317 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
318 if (!mdb->mhash) {
319 kfree(mdb);
320 return -ENOMEM;
321 }
322
323 mdb->size = old ? old->size : 0;
324 mdb->ver = old ? old->ver ^ 1 : 0;
325
326 if (!old || elasticity)
327 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
328 else
329 mdb->secret = old->secret;
330
331 if (!old)
332 goto out;
333
334 err = br_mdb_copy(mdb, old, elasticity);
335 if (err) {
336 kfree(mdb->mhash);
337 kfree(mdb);
338 return err;
339 }
340
341 call_rcu_bh(&mdb->rcu, br_mdb_free);
342
343out:
344 rcu_assign_pointer(*mdbp, mdb);
345
346 return 0;
347}
348
349static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
350 __be32 group)
351{
352 struct sk_buff *skb;
353 struct igmphdr *ih;
354 struct ethhdr *eth;
355 struct iphdr *iph;
356
357 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
358 sizeof(*ih) + 4);
359 if (!skb)
360 goto out;
361
362 skb->protocol = htons(ETH_P_IP);
363
364 skb_reset_mac_header(skb);
365 eth = eth_hdr(skb);
366
367 memcpy(eth->h_source, br->dev->dev_addr, 6);
368 eth->h_dest[0] = 1;
369 eth->h_dest[1] = 0;
370 eth->h_dest[2] = 0x5e;
371 eth->h_dest[3] = 0;
372 eth->h_dest[4] = 0;
373 eth->h_dest[5] = 1;
374 eth->h_proto = htons(ETH_P_IP);
375 skb_put(skb, sizeof(*eth));
376
377 skb_set_network_header(skb, skb->len);
378 iph = ip_hdr(skb);
379
380 iph->version = 4;
381 iph->ihl = 6;
382 iph->tos = 0xc0;
383 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
384 iph->id = 0;
385 iph->frag_off = htons(IP_DF);
386 iph->ttl = 1;
387 iph->protocol = IPPROTO_IGMP;
388 iph->saddr = 0;
389 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
390 ((u8 *)&iph[1])[0] = IPOPT_RA;
391 ((u8 *)&iph[1])[1] = 4;
392 ((u8 *)&iph[1])[2] = 0;
393 ((u8 *)&iph[1])[3] = 0;
394 ip_send_check(iph);
395 skb_put(skb, 24);
396
397 skb_set_transport_header(skb, skb->len);
398 ih = igmp_hdr(skb);
399 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
400 ih->code = (group ? br->multicast_last_member_interval :
401 br->multicast_query_response_interval) /
402 (HZ / IGMP_TIMER_SCALE);
403 ih->group = group;
404 ih->csum = 0;
405 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
406 skb_put(skb, sizeof(*ih));
407
408 __skb_pull(skb, sizeof(*eth));
409
410out:
411 return skb;
412}
413
414#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
415static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
416 const struct in6_addr *group)
417{
418 struct sk_buff *skb;
419 struct ipv6hdr *ip6h;
420 struct mld_msg *mldq;
421 struct ethhdr *eth;
422 u8 *hopopt;
423 unsigned long interval;
424
425 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
426 8 + sizeof(*mldq));
427 if (!skb)
428 goto out;
429
430 skb->protocol = htons(ETH_P_IPV6);
431
432 /* Ethernet header */
433 skb_reset_mac_header(skb);
434 eth = eth_hdr(skb);
435
436 memcpy(eth->h_source, br->dev->dev_addr, 6);
437 eth->h_proto = htons(ETH_P_IPV6);
438 skb_put(skb, sizeof(*eth));
439
440 /* IPv6 header + HbH option */
441 skb_set_network_header(skb, skb->len);
442 ip6h = ipv6_hdr(skb);
443
444 *(__force __be32 *)ip6h = htonl(0x60000000);
445 ip6h->payload_len = htons(8 + sizeof(*mldq));
446 ip6h->nexthdr = IPPROTO_HOPOPTS;
447 ip6h->hop_limit = 1;
448 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
449 ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
450 &ip6h->saddr);
451 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
452
453 hopopt = (u8 *)(ip6h + 1);
454 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
455 hopopt[1] = 0; /* length of HbH */
456 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
457 hopopt[3] = 2; /* Length of RA Option */
458 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
459 hopopt[5] = 0;
460 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */
461 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */
462
463 skb_put(skb, sizeof(*ip6h) + 8);
464
465 /* ICMPv6 */
466 skb_set_transport_header(skb, skb->len);
467 mldq = (struct mld_msg *) icmp6_hdr(skb);
468
469 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
470 br->multicast_query_response_interval;
471
472 mldq->mld_type = ICMPV6_MGM_QUERY;
473 mldq->mld_code = 0;
474 mldq->mld_cksum = 0;
475 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
476 mldq->mld_reserved = 0;
477 ipv6_addr_copy(&mldq->mld_mca, group);
478
479 /* checksum */
480 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
481 sizeof(*mldq), IPPROTO_ICMPV6,
482 csum_partial(mldq,
483 sizeof(*mldq), 0));
484 skb_put(skb, sizeof(*mldq));
485
486 __skb_pull(skb, sizeof(*eth));
487
488out:
489 return skb;
490}
491#endif
492
493static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
494 struct br_ip *addr)
495{
496 switch (addr->proto) {
497 case htons(ETH_P_IP):
498 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
499#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
500 case htons(ETH_P_IPV6):
501 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
502#endif
503 }
504 return NULL;
505}
506
507static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
508{
509 struct net_bridge *br = mp->br;
510 struct sk_buff *skb;
511
512 skb = br_multicast_alloc_query(br, &mp->addr);
513 if (!skb)
514 goto timer;
515
516 netif_rx(skb);
517
518timer:
519 if (++mp->queries_sent < br->multicast_last_member_count)
520 mod_timer(&mp->query_timer,
521 jiffies + br->multicast_last_member_interval);
522}
523
524static void br_multicast_group_query_expired(unsigned long data)
525{
526 struct net_bridge_mdb_entry *mp = (void *)data;
527 struct net_bridge *br = mp->br;
528
529 spin_lock(&br->multicast_lock);
530 if (!netif_running(br->dev) || !mp->mglist ||
531 mp->queries_sent >= br->multicast_last_member_count)
532 goto out;
533
534 br_multicast_send_group_query(mp);
535
536out:
537 spin_unlock(&br->multicast_lock);
538}
539
540static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
541{
542 struct net_bridge_port *port = pg->port;
543 struct net_bridge *br = port->br;
544 struct sk_buff *skb;
545
546 skb = br_multicast_alloc_query(br, &pg->addr);
547 if (!skb)
548 goto timer;
549
550 br_deliver(port, skb);
551
552timer:
553 if (++pg->queries_sent < br->multicast_last_member_count)
554 mod_timer(&pg->query_timer,
555 jiffies + br->multicast_last_member_interval);
556}
557
558static void br_multicast_port_group_query_expired(unsigned long data)
559{
560 struct net_bridge_port_group *pg = (void *)data;
561 struct net_bridge_port *port = pg->port;
562 struct net_bridge *br = port->br;
563
564 spin_lock(&br->multicast_lock);
565 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
566 pg->queries_sent >= br->multicast_last_member_count)
567 goto out;
568
569 br_multicast_send_port_group_query(pg);
570
571out:
572 spin_unlock(&br->multicast_lock);
573}
574
575static struct net_bridge_mdb_entry *br_multicast_get_group(
576 struct net_bridge *br, struct net_bridge_port *port,
577 struct br_ip *group, int hash)
578{
579 struct net_bridge_mdb_htable *mdb;
580 struct net_bridge_mdb_entry *mp;
581 struct hlist_node *p;
582 unsigned count = 0;
583 unsigned max;
584 int elasticity;
585 int err;
586
587 mdb = rcu_dereference_protected(br->mdb, 1);
588 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
589 count++;
590 if (unlikely(br_ip_equal(group, &mp->addr)))
591 return mp;
592 }
593
594 elasticity = 0;
595 max = mdb->max;
596
597 if (unlikely(count > br->hash_elasticity && count)) {
598 if (net_ratelimit())
599 br_info(br, "Multicast hash table "
600 "chain limit reached: %s\n",
601 port ? port->dev->name : br->dev->name);
602
603 elasticity = br->hash_elasticity;
604 }
605
606 if (mdb->size >= max) {
607 max *= 2;
608 if (unlikely(max >= br->hash_max)) {
609 br_warn(br, "Multicast hash table maximum "
610 "reached, disabling snooping: %s, %d\n",
611 port ? port->dev->name : br->dev->name, max);
612 err = -E2BIG;
613disable:
614 br->multicast_disabled = 1;
615 goto err;
616 }
617 }
618
619 if (max > mdb->max || elasticity) {
620 if (mdb->old) {
621 if (net_ratelimit())
622 br_info(br, "Multicast hash table "
623 "on fire: %s\n",
624 port ? port->dev->name : br->dev->name);
625 err = -EEXIST;
626 goto err;
627 }
628
629 err = br_mdb_rehash(&br->mdb, max, elasticity);
630 if (err) {
631 br_warn(br, "Cannot rehash multicast "
632 "hash table, disabling snooping: %s, %d, %d\n",
633 port ? port->dev->name : br->dev->name,
634 mdb->size, err);
635 goto disable;
636 }
637
638 err = -EAGAIN;
639 goto err;
640 }
641
642 return NULL;
643
644err:
645 mp = ERR_PTR(err);
646 return mp;
647}
648
649static struct net_bridge_mdb_entry *br_multicast_new_group(
650 struct net_bridge *br, struct net_bridge_port *port,
651 struct br_ip *group)
652{
653 struct net_bridge_mdb_htable *mdb;
654 struct net_bridge_mdb_entry *mp;
655 int hash;
656 int err;
657
658 mdb = rcu_dereference_protected(br->mdb, 1);
659 if (!mdb) {
660 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
661 if (err)
662 return ERR_PTR(err);
663 goto rehash;
664 }
665
666 hash = br_ip_hash(mdb, group);
667 mp = br_multicast_get_group(br, port, group, hash);
668 switch (PTR_ERR(mp)) {
669 case 0:
670 break;
671
672 case -EAGAIN:
673rehash:
674 mdb = rcu_dereference_protected(br->mdb, 1);
675 hash = br_ip_hash(mdb, group);
676 break;
677
678 default:
679 goto out;
680 }
681
682 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
683 if (unlikely(!mp))
684 return ERR_PTR(-ENOMEM);
685
686 mp->br = br;
687 mp->addr = *group;
688 setup_timer(&mp->timer, br_multicast_group_expired,
689 (unsigned long)mp);
690 setup_timer(&mp->query_timer, br_multicast_group_query_expired,
691 (unsigned long)mp);
692
693 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
694 mdb->size++;
695
696out:
697 return mp;
698}
699
700static int br_multicast_add_group(struct net_bridge *br,
701 struct net_bridge_port *port,
702 struct br_ip *group)
703{
704 struct net_bridge_mdb_entry *mp;
705 struct net_bridge_port_group *p;
706 struct net_bridge_port_group __rcu **pp;
707 unsigned long now = jiffies;
708 int err;
709
710 spin_lock(&br->multicast_lock);
711 if (!netif_running(br->dev) ||
712 (port && port->state == BR_STATE_DISABLED))
713 goto out;
714
715 mp = br_multicast_new_group(br, port, group);
716 err = PTR_ERR(mp);
717 if (IS_ERR(mp))
718 goto err;
719
720 if (!port) {
721 mp->mglist = true;
722 mod_timer(&mp->timer, now + br->multicast_membership_interval);
723 goto out;
724 }
725
726 for (pp = &mp->ports;
727 (p = mlock_dereference(*pp, br)) != NULL;
728 pp = &p->next) {
729 if (p->port == port)
730 goto found;
731 if ((unsigned long)p->port < (unsigned long)port)
732 break;
733 }
734
735 p = kzalloc(sizeof(*p), GFP_ATOMIC);
736 err = -ENOMEM;
737 if (unlikely(!p))
738 goto err;
739
740 p->addr = *group;
741 p->port = port;
742 p->next = *pp;
743 hlist_add_head(&p->mglist, &port->mglist);
744 setup_timer(&p->timer, br_multicast_port_group_expired,
745 (unsigned long)p);
746 setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
747 (unsigned long)p);
748
749 rcu_assign_pointer(*pp, p);
750
751found:
752 mod_timer(&p->timer, now + br->multicast_membership_interval);
753out:
754 err = 0;
755
756err:
757 spin_unlock(&br->multicast_lock);
758 return err;
759}
760
761static int br_ip4_multicast_add_group(struct net_bridge *br,
762 struct net_bridge_port *port,
763 __be32 group)
764{
765 struct br_ip br_group;
766
767 if (ipv4_is_local_multicast(group))
768 return 0;
769
770 br_group.u.ip4 = group;
771 br_group.proto = htons(ETH_P_IP);
772
773 return br_multicast_add_group(br, port, &br_group);
774}
775
776#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
777static int br_ip6_multicast_add_group(struct net_bridge *br,
778 struct net_bridge_port *port,
779 const struct in6_addr *group)
780{
781 struct br_ip br_group;
782
783 if (!ipv6_is_transient_multicast(group))
784 return 0;
785
786 ipv6_addr_copy(&br_group.u.ip6, group);
787 br_group.proto = htons(ETH_P_IPV6);
788
789 return br_multicast_add_group(br, port, &br_group);
790}
791#endif
792
793static void br_multicast_router_expired(unsigned long data)
794{
795 struct net_bridge_port *port = (void *)data;
796 struct net_bridge *br = port->br;
797
798 spin_lock(&br->multicast_lock);
799 if (port->multicast_router != 1 ||
800 timer_pending(&port->multicast_router_timer) ||
801 hlist_unhashed(&port->rlist))
802 goto out;
803
804 hlist_del_init_rcu(&port->rlist);
805
806out:
807 spin_unlock(&br->multicast_lock);
808}
809
810static void br_multicast_local_router_expired(unsigned long data)
811{
812}
813
814static void __br_multicast_send_query(struct net_bridge *br,
815 struct net_bridge_port *port,
816 struct br_ip *ip)
817{
818 struct sk_buff *skb;
819
820 skb = br_multicast_alloc_query(br, ip);
821 if (!skb)
822 return;
823
824 if (port) {
825 __skb_push(skb, sizeof(struct ethhdr));
826 skb->dev = port->dev;
827 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
828 dev_queue_xmit);
829 } else
830 netif_rx(skb);
831}
832
833static void br_multicast_send_query(struct net_bridge *br,
834 struct net_bridge_port *port, u32 sent)
835{
836 unsigned long time;
837 struct br_ip br_group;
838
839 if (!netif_running(br->dev) || br->multicast_disabled ||
840 timer_pending(&br->multicast_querier_timer))
841 return;
842
843 memset(&br_group.u, 0, sizeof(br_group.u));
844
845 br_group.proto = htons(ETH_P_IP);
846 __br_multicast_send_query(br, port, &br_group);
847
848#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
849 br_group.proto = htons(ETH_P_IPV6);
850 __br_multicast_send_query(br, port, &br_group);
851#endif
852
853 time = jiffies;
854 time += sent < br->multicast_startup_query_count ?
855 br->multicast_startup_query_interval :
856 br->multicast_query_interval;
857 mod_timer(port ? &port->multicast_query_timer :
858 &br->multicast_query_timer, time);
859}
860
861static void br_multicast_port_query_expired(unsigned long data)
862{
863 struct net_bridge_port *port = (void *)data;
864 struct net_bridge *br = port->br;
865
866 spin_lock(&br->multicast_lock);
867 if (port->state == BR_STATE_DISABLED ||
868 port->state == BR_STATE_BLOCKING)
869 goto out;
870
871 if (port->multicast_startup_queries_sent <
872 br->multicast_startup_query_count)
873 port->multicast_startup_queries_sent++;
874
875 br_multicast_send_query(port->br, port,
876 port->multicast_startup_queries_sent);
877
878out:
879 spin_unlock(&br->multicast_lock);
880}
881
882void br_multicast_add_port(struct net_bridge_port *port)
883{
884 port->multicast_router = 1;
885
886 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
887 (unsigned long)port);
888 setup_timer(&port->multicast_query_timer,
889 br_multicast_port_query_expired, (unsigned long)port);
890}
891
892void br_multicast_del_port(struct net_bridge_port *port)
893{
894 del_timer_sync(&port->multicast_router_timer);
895}
896
897static void __br_multicast_enable_port(struct net_bridge_port *port)
898{
899 port->multicast_startup_queries_sent = 0;
900
901 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
902 del_timer(&port->multicast_query_timer))
903 mod_timer(&port->multicast_query_timer, jiffies);
904}
905
906void br_multicast_enable_port(struct net_bridge_port *port)
907{
908 struct net_bridge *br = port->br;
909
910 spin_lock(&br->multicast_lock);
911 if (br->multicast_disabled || !netif_running(br->dev))
912 goto out;
913
914 __br_multicast_enable_port(port);
915
916out:
917 spin_unlock(&br->multicast_lock);
918}
919
920void br_multicast_disable_port(struct net_bridge_port *port)
921{
922 struct net_bridge *br = port->br;
923 struct net_bridge_port_group *pg;
924 struct hlist_node *p, *n;
925
926 spin_lock(&br->multicast_lock);
927 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
928 br_multicast_del_pg(br, pg);
929
930 if (!hlist_unhashed(&port->rlist))
931 hlist_del_init_rcu(&port->rlist);
932 del_timer(&port->multicast_router_timer);
933 del_timer(&port->multicast_query_timer);
934 spin_unlock(&br->multicast_lock);
935}
936
937static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
938 struct net_bridge_port *port,
939 struct sk_buff *skb)
940{
941 struct igmpv3_report *ih;
942 struct igmpv3_grec *grec;
943 int i;
944 int len;
945 int num;
946 int type;
947 int err = 0;
948 __be32 group;
949
950 if (!pskb_may_pull(skb, sizeof(*ih)))
951 return -EINVAL;
952
953 ih = igmpv3_report_hdr(skb);
954 num = ntohs(ih->ngrec);
955 len = sizeof(*ih);
956
957 for (i = 0; i < num; i++) {
958 len += sizeof(*grec);
959 if (!pskb_may_pull(skb, len))
960 return -EINVAL;
961
962 grec = (void *)(skb->data + len - sizeof(*grec));
963 group = grec->grec_mca;
964 type = grec->grec_type;
965
966 len += ntohs(grec->grec_nsrcs) * 4;
967 if (!pskb_may_pull(skb, len))
968 return -EINVAL;
969
970 /* We treat this as an IGMPv2 report for now. */
971 switch (type) {
972 case IGMPV3_MODE_IS_INCLUDE:
973 case IGMPV3_MODE_IS_EXCLUDE:
974 case IGMPV3_CHANGE_TO_INCLUDE:
975 case IGMPV3_CHANGE_TO_EXCLUDE:
976 case IGMPV3_ALLOW_NEW_SOURCES:
977 case IGMPV3_BLOCK_OLD_SOURCES:
978 break;
979
980 default:
981 continue;
982 }
983
984 err = br_ip4_multicast_add_group(br, port, group);
985 if (err)
986 break;
987 }
988
989 return err;
990}
991
992#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
993static int br_ip6_multicast_mld2_report(struct net_bridge *br,
994 struct net_bridge_port *port,
995 struct sk_buff *skb)
996{
997 struct icmp6hdr *icmp6h;
998 struct mld2_grec *grec;
999 int i;
1000 int len;
1001 int num;
1002 int err = 0;
1003
1004 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1005 return -EINVAL;
1006
1007 icmp6h = icmp6_hdr(skb);
1008 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1009 len = sizeof(*icmp6h);
1010
1011 for (i = 0; i < num; i++) {
1012 __be16 *nsrcs, _nsrcs;
1013
1014 nsrcs = skb_header_pointer(skb,
1015 len + offsetof(struct mld2_grec,
1016 grec_nsrcs),
1017 sizeof(_nsrcs), &_nsrcs);
1018 if (!nsrcs)
1019 return -EINVAL;
1020
1021 if (!pskb_may_pull(skb,
1022 len + sizeof(*grec) +
1023 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1024 return -EINVAL;
1025
1026 grec = (struct mld2_grec *)(skb->data + len);
1027 len += sizeof(*grec) +
1028 sizeof(struct in6_addr) * ntohs(*nsrcs);
1029
1030 /* We treat these as MLDv1 reports for now. */
1031 switch (grec->grec_type) {
1032 case MLD2_MODE_IS_INCLUDE:
1033 case MLD2_MODE_IS_EXCLUDE:
1034 case MLD2_CHANGE_TO_INCLUDE:
1035 case MLD2_CHANGE_TO_EXCLUDE:
1036 case MLD2_ALLOW_NEW_SOURCES:
1037 case MLD2_BLOCK_OLD_SOURCES:
1038 break;
1039
1040 default:
1041 continue;
1042 }
1043
1044 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
1045 if (!err)
1046 break;
1047 }
1048
1049 return err;
1050}
1051#endif
1052
1053/*
1054 * Add port to rotuer_list
1055 * list is maintained ordered by pointer value
1056 * and locked by br->multicast_lock and RCU
1057 */
1058static void br_multicast_add_router(struct net_bridge *br,
1059 struct net_bridge_port *port)
1060{
1061 struct net_bridge_port *p;
1062 struct hlist_node *n, *slot = NULL;
1063
1064 hlist_for_each_entry(p, n, &br->router_list, rlist) {
1065 if ((unsigned long) port >= (unsigned long) p)
1066 break;
1067 slot = n;
1068 }
1069
1070 if (slot)
1071 hlist_add_after_rcu(slot, &port->rlist);
1072 else
1073 hlist_add_head_rcu(&port->rlist, &br->router_list);
1074}
1075
1076static void br_multicast_mark_router(struct net_bridge *br,
1077 struct net_bridge_port *port)
1078{
1079 unsigned long now = jiffies;
1080
1081 if (!port) {
1082 if (br->multicast_router == 1)
1083 mod_timer(&br->multicast_router_timer,
1084 now + br->multicast_querier_interval);
1085 return;
1086 }
1087
1088 if (port->multicast_router != 1)
1089 return;
1090
1091 if (!hlist_unhashed(&port->rlist))
1092 goto timer;
1093
1094 br_multicast_add_router(br, port);
1095
1096timer:
1097 mod_timer(&port->multicast_router_timer,
1098 now + br->multicast_querier_interval);
1099}
1100
1101static void br_multicast_query_received(struct net_bridge *br,
1102 struct net_bridge_port *port,
1103 int saddr)
1104{
1105 if (saddr)
1106 mod_timer(&br->multicast_querier_timer,
1107 jiffies + br->multicast_querier_interval);
1108 else if (timer_pending(&br->multicast_querier_timer))
1109 return;
1110
1111 br_multicast_mark_router(br, port);
1112}
1113
1114static int br_ip4_multicast_query(struct net_bridge *br,
1115 struct net_bridge_port *port,
1116 struct sk_buff *skb)
1117{
1118 const struct iphdr *iph = ip_hdr(skb);
1119 struct igmphdr *ih = igmp_hdr(skb);
1120 struct net_bridge_mdb_entry *mp;
1121 struct igmpv3_query *ih3;
1122 struct net_bridge_port_group *p;
1123 struct net_bridge_port_group __rcu **pp;
1124 unsigned long max_delay;
1125 unsigned long now = jiffies;
1126 __be32 group;
1127 int err = 0;
1128
1129 spin_lock(&br->multicast_lock);
1130 if (!netif_running(br->dev) ||
1131 (port && port->state == BR_STATE_DISABLED))
1132 goto out;
1133
1134 br_multicast_query_received(br, port, !!iph->saddr);
1135
1136 group = ih->group;
1137
1138 if (skb->len == sizeof(*ih)) {
1139 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1140
1141 if (!max_delay) {
1142 max_delay = 10 * HZ;
1143 group = 0;
1144 }
1145 } else {
1146 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1147 err = -EINVAL;
1148 goto out;
1149 }
1150
1151 ih3 = igmpv3_query_hdr(skb);
1152 if (ih3->nsrcs)
1153 goto out;
1154
1155 max_delay = ih3->code ?
1156 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1157 }
1158
1159 if (!group)
1160 goto out;
1161
1162 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
1163 if (!mp)
1164 goto out;
1165
1166 max_delay *= br->multicast_last_member_count;
1167
1168 if (mp->mglist &&
1169 (timer_pending(&mp->timer) ?
1170 time_after(mp->timer.expires, now + max_delay) :
1171 try_to_del_timer_sync(&mp->timer) >= 0))
1172 mod_timer(&mp->timer, now + max_delay);
1173
1174 for (pp = &mp->ports;
1175 (p = mlock_dereference(*pp, br)) != NULL;
1176 pp = &p->next) {
1177 if (timer_pending(&p->timer) ?
1178 time_after(p->timer.expires, now + max_delay) :
1179 try_to_del_timer_sync(&p->timer) >= 0)
1180 mod_timer(&p->timer, now + max_delay);
1181 }
1182
1183out:
1184 spin_unlock(&br->multicast_lock);
1185 return err;
1186}
1187
1188#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1189static int br_ip6_multicast_query(struct net_bridge *br,
1190 struct net_bridge_port *port,
1191 struct sk_buff *skb)
1192{
1193 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1194 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1195 struct net_bridge_mdb_entry *mp;
1196 struct mld2_query *mld2q;
1197 struct net_bridge_port_group *p;
1198 struct net_bridge_port_group __rcu **pp;
1199 unsigned long max_delay;
1200 unsigned long now = jiffies;
1201 const struct in6_addr *group = NULL;
1202 int err = 0;
1203
1204 spin_lock(&br->multicast_lock);
1205 if (!netif_running(br->dev) ||
1206 (port && port->state == BR_STATE_DISABLED))
1207 goto out;
1208
1209 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1210
1211 if (skb->len == sizeof(*mld)) {
1212 if (!pskb_may_pull(skb, sizeof(*mld))) {
1213 err = -EINVAL;
1214 goto out;
1215 }
1216 mld = (struct mld_msg *) icmp6_hdr(skb);
1217 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
1218 if (max_delay)
1219 group = &mld->mld_mca;
1220 } else if (skb->len >= sizeof(*mld2q)) {
1221 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1222 err = -EINVAL;
1223 goto out;
1224 }
1225 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1226 if (!mld2q->mld2q_nsrcs)
1227 group = &mld2q->mld2q_mca;
1228 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1229 }
1230
1231 if (!group)
1232 goto out;
1233
1234 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
1235 if (!mp)
1236 goto out;
1237
1238 max_delay *= br->multicast_last_member_count;
1239 if (mp->mglist &&
1240 (timer_pending(&mp->timer) ?
1241 time_after(mp->timer.expires, now + max_delay) :
1242 try_to_del_timer_sync(&mp->timer) >= 0))
1243 mod_timer(&mp->timer, now + max_delay);
1244
1245 for (pp = &mp->ports;
1246 (p = mlock_dereference(*pp, br)) != NULL;
1247 pp = &p->next) {
1248 if (timer_pending(&p->timer) ?
1249 time_after(p->timer.expires, now + max_delay) :
1250 try_to_del_timer_sync(&p->timer) >= 0)
1251 mod_timer(&p->timer, now + max_delay);
1252 }
1253
1254out:
1255 spin_unlock(&br->multicast_lock);
1256 return err;
1257}
1258#endif
1259
1260static void br_multicast_leave_group(struct net_bridge *br,
1261 struct net_bridge_port *port,
1262 struct br_ip *group)
1263{
1264 struct net_bridge_mdb_htable *mdb;
1265 struct net_bridge_mdb_entry *mp;
1266 struct net_bridge_port_group *p;
1267 unsigned long now;
1268 unsigned long time;
1269
1270 spin_lock(&br->multicast_lock);
1271 if (!netif_running(br->dev) ||
1272 (port && port->state == BR_STATE_DISABLED) ||
1273 timer_pending(&br->multicast_querier_timer))
1274 goto out;
1275
1276 mdb = mlock_dereference(br->mdb, br);
1277 mp = br_mdb_ip_get(mdb, group);
1278 if (!mp)
1279 goto out;
1280
1281 now = jiffies;
1282 time = now + br->multicast_last_member_count *
1283 br->multicast_last_member_interval;
1284
1285 if (!port) {
1286 if (mp->mglist &&
1287 (timer_pending(&mp->timer) ?
1288 time_after(mp->timer.expires, time) :
1289 try_to_del_timer_sync(&mp->timer) >= 0)) {
1290 mod_timer(&mp->timer, time);
1291
1292 mp->queries_sent = 0;
1293 mod_timer(&mp->query_timer, now);
1294 }
1295
1296 goto out;
1297 }
1298
1299 for (p = mlock_dereference(mp->ports, br);
1300 p != NULL;
1301 p = mlock_dereference(p->next, br)) {
1302 if (p->port != port)
1303 continue;
1304
1305 if (!hlist_unhashed(&p->mglist) &&
1306 (timer_pending(&p->timer) ?
1307 time_after(p->timer.expires, time) :
1308 try_to_del_timer_sync(&p->timer) >= 0)) {
1309 mod_timer(&p->timer, time);
1310
1311 p->queries_sent = 0;
1312 mod_timer(&p->query_timer, now);
1313 }
1314
1315 break;
1316 }
1317
1318out:
1319 spin_unlock(&br->multicast_lock);
1320}
1321
1322static void br_ip4_multicast_leave_group(struct net_bridge *br,
1323 struct net_bridge_port *port,
1324 __be32 group)
1325{
1326 struct br_ip br_group;
1327
1328 if (ipv4_is_local_multicast(group))
1329 return;
1330
1331 br_group.u.ip4 = group;
1332 br_group.proto = htons(ETH_P_IP);
1333
1334 br_multicast_leave_group(br, port, &br_group);
1335}
1336
1337#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1338static void br_ip6_multicast_leave_group(struct net_bridge *br,
1339 struct net_bridge_port *port,
1340 const struct in6_addr *group)
1341{
1342 struct br_ip br_group;
1343
1344 if (!ipv6_is_transient_multicast(group))
1345 return;
1346
1347 ipv6_addr_copy(&br_group.u.ip6, group);
1348 br_group.proto = htons(ETH_P_IPV6);
1349
1350 br_multicast_leave_group(br, port, &br_group);
1351}
1352#endif
1353
1354static int br_multicast_ipv4_rcv(struct net_bridge *br,
1355 struct net_bridge_port *port,
1356 struct sk_buff *skb)
1357{
1358 struct sk_buff *skb2 = skb;
1359 const struct iphdr *iph;
1360 struct igmphdr *ih;
1361 unsigned len;
1362 unsigned offset;
1363 int err;
1364
1365 /* We treat OOM as packet loss for now. */
1366 if (!pskb_may_pull(skb, sizeof(*iph)))
1367 return -EINVAL;
1368
1369 iph = ip_hdr(skb);
1370
1371 if (iph->ihl < 5 || iph->version != 4)
1372 return -EINVAL;
1373
1374 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1375 return -EINVAL;
1376
1377 iph = ip_hdr(skb);
1378
1379 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1380 return -EINVAL;
1381
1382 if (iph->protocol != IPPROTO_IGMP) {
1383 if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
1384 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1385 return 0;
1386 }
1387
1388 len = ntohs(iph->tot_len);
1389 if (skb->len < len || len < ip_hdrlen(skb))
1390 return -EINVAL;
1391
1392 if (skb->len > len) {
1393 skb2 = skb_clone(skb, GFP_ATOMIC);
1394 if (!skb2)
1395 return -ENOMEM;
1396
1397 err = pskb_trim_rcsum(skb2, len);
1398 if (err)
1399 goto err_out;
1400 }
1401
1402 len -= ip_hdrlen(skb2);
1403 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1404 __skb_pull(skb2, offset);
1405 skb_reset_transport_header(skb2);
1406
1407 err = -EINVAL;
1408 if (!pskb_may_pull(skb2, sizeof(*ih)))
1409 goto out;
1410
1411 switch (skb2->ip_summed) {
1412 case CHECKSUM_COMPLETE:
1413 if (!csum_fold(skb2->csum))
1414 break;
1415 /* fall through */
1416 case CHECKSUM_NONE:
1417 skb2->csum = 0;
1418 if (skb_checksum_complete(skb2))
1419 goto out;
1420 }
1421
1422 err = 0;
1423
1424 BR_INPUT_SKB_CB(skb)->igmp = 1;
1425 ih = igmp_hdr(skb2);
1426
1427 switch (ih->type) {
1428 case IGMP_HOST_MEMBERSHIP_REPORT:
1429 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1430 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1431 err = br_ip4_multicast_add_group(br, port, ih->group);
1432 break;
1433 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1434 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1435 break;
1436 case IGMP_HOST_MEMBERSHIP_QUERY:
1437 err = br_ip4_multicast_query(br, port, skb2);
1438 break;
1439 case IGMP_HOST_LEAVE_MESSAGE:
1440 br_ip4_multicast_leave_group(br, port, ih->group);
1441 break;
1442 }
1443
1444out:
1445 __skb_push(skb2, offset);
1446err_out:
1447 if (skb2 != skb)
1448 kfree_skb(skb2);
1449 return err;
1450}
1451
1452#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1453static int br_multicast_ipv6_rcv(struct net_bridge *br,
1454 struct net_bridge_port *port,
1455 struct sk_buff *skb)
1456{
1457 struct sk_buff *skb2;
1458 const struct ipv6hdr *ip6h;
1459 u8 icmp6_type;
1460 u8 nexthdr;
1461 unsigned len;
1462 int offset;
1463 int err;
1464
1465 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1466 return -EINVAL;
1467
1468 ip6h = ipv6_hdr(skb);
1469
1470 /*
1471 * We're interested in MLD messages only.
1472 * - Version is 6
1473 * - MLD has always Router Alert hop-by-hop option
1474 * - But we do not support jumbrograms.
1475 */
1476 if (ip6h->version != 6 ||
1477 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1478 ip6h->payload_len == 0)
1479 return 0;
1480
1481 len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
1482 if (skb->len < len)
1483 return -EINVAL;
1484
1485 nexthdr = ip6h->nexthdr;
1486 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
1487
1488 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1489 return 0;
1490
1491 /* Okay, we found ICMPv6 header */
1492 skb2 = skb_clone(skb, GFP_ATOMIC);
1493 if (!skb2)
1494 return -ENOMEM;
1495
1496 err = -EINVAL;
1497 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1498 goto out;
1499
1500 len -= offset - skb_network_offset(skb2);
1501
1502 __skb_pull(skb2, offset);
1503 skb_reset_transport_header(skb2);
1504
1505 icmp6_type = icmp6_hdr(skb2)->icmp6_type;
1506
1507 switch (icmp6_type) {
1508 case ICMPV6_MGM_QUERY:
1509 case ICMPV6_MGM_REPORT:
1510 case ICMPV6_MGM_REDUCTION:
1511 case ICMPV6_MLD2_REPORT:
1512 break;
1513 default:
1514 err = 0;
1515 goto out;
1516 }
1517
1518 /* Okay, we found MLD message. Check further. */
1519 if (skb2->len > len) {
1520 err = pskb_trim_rcsum(skb2, len);
1521 if (err)
1522 goto out;
1523 err = -EINVAL;
1524 }
1525
1526 ip6h = ipv6_hdr(skb2);
1527
1528 switch (skb2->ip_summed) {
1529 case CHECKSUM_COMPLETE:
1530 if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
1531 IPPROTO_ICMPV6, skb2->csum))
1532 break;
1533 /*FALLTHROUGH*/
1534 case CHECKSUM_NONE:
1535 skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
1536 &ip6h->daddr,
1537 skb2->len,
1538 IPPROTO_ICMPV6, 0));
1539 if (__skb_checksum_complete(skb2))
1540 goto out;
1541 }
1542
1543 err = 0;
1544
1545 BR_INPUT_SKB_CB(skb)->igmp = 1;
1546
1547 switch (icmp6_type) {
1548 case ICMPV6_MGM_REPORT:
1549 {
1550 struct mld_msg *mld;
1551 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1552 err = -EINVAL;
1553 goto out;
1554 }
1555 mld = (struct mld_msg *)skb_transport_header(skb2);
1556 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1557 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1558 break;
1559 }
1560 case ICMPV6_MLD2_REPORT:
1561 err = br_ip6_multicast_mld2_report(br, port, skb2);
1562 break;
1563 case ICMPV6_MGM_QUERY:
1564 err = br_ip6_multicast_query(br, port, skb2);
1565 break;
1566 case ICMPV6_MGM_REDUCTION:
1567 {
1568 struct mld_msg *mld;
1569 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1570 err = -EINVAL;
1571 goto out;
1572 }
1573 mld = (struct mld_msg *)skb_transport_header(skb2);
1574 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1575 }
1576 }
1577
1578out:
1579 kfree_skb(skb2);
1580 return err;
1581}
1582#endif
1583
1584int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1585 struct sk_buff *skb)
1586{
1587 BR_INPUT_SKB_CB(skb)->igmp = 0;
1588 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1589
1590 if (br->multicast_disabled)
1591 return 0;
1592
1593 switch (skb->protocol) {
1594 case htons(ETH_P_IP):
1595 return br_multicast_ipv4_rcv(br, port, skb);
1596#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1597 case htons(ETH_P_IPV6):
1598 return br_multicast_ipv6_rcv(br, port, skb);
1599#endif
1600 }
1601
1602 return 0;
1603}
1604
1605static void br_multicast_query_expired(unsigned long data)
1606{
1607 struct net_bridge *br = (void *)data;
1608
1609 spin_lock(&br->multicast_lock);
1610 if (br->multicast_startup_queries_sent <
1611 br->multicast_startup_query_count)
1612 br->multicast_startup_queries_sent++;
1613
1614 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1615
1616 spin_unlock(&br->multicast_lock);
1617}
1618
1619void br_multicast_init(struct net_bridge *br)
1620{
1621 br->hash_elasticity = 4;
1622 br->hash_max = 512;
1623
1624 br->multicast_router = 1;
1625 br->multicast_last_member_count = 2;
1626 br->multicast_startup_query_count = 2;
1627
1628 br->multicast_last_member_interval = HZ;
1629 br->multicast_query_response_interval = 10 * HZ;
1630 br->multicast_startup_query_interval = 125 * HZ / 4;
1631 br->multicast_query_interval = 125 * HZ;
1632 br->multicast_querier_interval = 255 * HZ;
1633 br->multicast_membership_interval = 260 * HZ;
1634
1635 spin_lock_init(&br->multicast_lock);
1636 setup_timer(&br->multicast_router_timer,
1637 br_multicast_local_router_expired, 0);
1638 setup_timer(&br->multicast_querier_timer,
1639 br_multicast_local_router_expired, 0);
1640 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1641 (unsigned long)br);
1642}
1643
1644void br_multicast_open(struct net_bridge *br)
1645{
1646 br->multicast_startup_queries_sent = 0;
1647
1648 if (br->multicast_disabled)
1649 return;
1650
1651 mod_timer(&br->multicast_query_timer, jiffies);
1652}
1653
1654void br_multicast_stop(struct net_bridge *br)
1655{
1656 struct net_bridge_mdb_htable *mdb;
1657 struct net_bridge_mdb_entry *mp;
1658 struct hlist_node *p, *n;
1659 u32 ver;
1660 int i;
1661
1662 del_timer_sync(&br->multicast_router_timer);
1663 del_timer_sync(&br->multicast_querier_timer);
1664 del_timer_sync(&br->multicast_query_timer);
1665
1666 spin_lock_bh(&br->multicast_lock);
1667 mdb = mlock_dereference(br->mdb, br);
1668 if (!mdb)
1669 goto out;
1670
1671 br->mdb = NULL;
1672
1673 ver = mdb->ver;
1674 for (i = 0; i < mdb->max; i++) {
1675 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1676 hlist[ver]) {
1677 del_timer(&mp->timer);
1678 del_timer(&mp->query_timer);
1679 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1680 }
1681 }
1682
1683 if (mdb->old) {
1684 spin_unlock_bh(&br->multicast_lock);
1685 rcu_barrier_bh();
1686 spin_lock_bh(&br->multicast_lock);
1687 WARN_ON(mdb->old);
1688 }
1689
1690 mdb->old = mdb;
1691 call_rcu_bh(&mdb->rcu, br_mdb_free);
1692
1693out:
1694 spin_unlock_bh(&br->multicast_lock);
1695}
1696
1697int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1698{
1699 int err = -ENOENT;
1700
1701 spin_lock_bh(&br->multicast_lock);
1702 if (!netif_running(br->dev))
1703 goto unlock;
1704
1705 switch (val) {
1706 case 0:
1707 case 2:
1708 del_timer(&br->multicast_router_timer);
1709 /* fall through */
1710 case 1:
1711 br->multicast_router = val;
1712 err = 0;
1713 break;
1714
1715 default:
1716 err = -EINVAL;
1717 break;
1718 }
1719
1720unlock:
1721 spin_unlock_bh(&br->multicast_lock);
1722
1723 return err;
1724}
1725
1726int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1727{
1728 struct net_bridge *br = p->br;
1729 int err = -ENOENT;
1730
1731 spin_lock(&br->multicast_lock);
1732 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1733 goto unlock;
1734
1735 switch (val) {
1736 case 0:
1737 case 1:
1738 case 2:
1739 p->multicast_router = val;
1740 err = 0;
1741
1742 if (val < 2 && !hlist_unhashed(&p->rlist))
1743 hlist_del_init_rcu(&p->rlist);
1744
1745 if (val == 1)
1746 break;
1747
1748 del_timer(&p->multicast_router_timer);
1749
1750 if (val == 0)
1751 break;
1752
1753 br_multicast_add_router(br, p);
1754 break;
1755
1756 default:
1757 err = -EINVAL;
1758 break;
1759 }
1760
1761unlock:
1762 spin_unlock(&br->multicast_lock);
1763
1764 return err;
1765}
1766
1767int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1768{
1769 struct net_bridge_port *port;
1770 int err = 0;
1771 struct net_bridge_mdb_htable *mdb;
1772
1773 spin_lock(&br->multicast_lock);
1774 if (br->multicast_disabled == !val)
1775 goto unlock;
1776
1777 br->multicast_disabled = !val;
1778 if (br->multicast_disabled)
1779 goto unlock;
1780
1781 if (!netif_running(br->dev))
1782 goto unlock;
1783
1784 mdb = mlock_dereference(br->mdb, br);
1785 if (mdb) {
1786 if (mdb->old) {
1787 err = -EEXIST;
1788rollback:
1789 br->multicast_disabled = !!val;
1790 goto unlock;
1791 }
1792
1793 err = br_mdb_rehash(&br->mdb, mdb->max,
1794 br->hash_elasticity);
1795 if (err)
1796 goto rollback;
1797 }
1798
1799 br_multicast_open(br);
1800 list_for_each_entry(port, &br->port_list, list) {
1801 if (port->state == BR_STATE_DISABLED ||
1802 port->state == BR_STATE_BLOCKING)
1803 continue;
1804
1805 __br_multicast_enable_port(port);
1806 }
1807
1808unlock:
1809 spin_unlock(&br->multicast_lock);
1810
1811 return err;
1812}
1813
1814int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1815{
1816 int err = -ENOENT;
1817 u32 old;
1818 struct net_bridge_mdb_htable *mdb;
1819
1820 spin_lock(&br->multicast_lock);
1821 if (!netif_running(br->dev))
1822 goto unlock;
1823
1824 err = -EINVAL;
1825 if (!is_power_of_2(val))
1826 goto unlock;
1827
1828 mdb = mlock_dereference(br->mdb, br);
1829 if (mdb && val < mdb->size)
1830 goto unlock;
1831
1832 err = 0;
1833
1834 old = br->hash_max;
1835 br->hash_max = val;
1836
1837 if (mdb) {
1838 if (mdb->old) {
1839 err = -EEXIST;
1840rollback:
1841 br->hash_max = old;
1842 goto unlock;
1843 }
1844
1845 err = br_mdb_rehash(&br->mdb, br->hash_max,
1846 br->hash_elasticity);
1847 if (err)
1848 goto rollback;
1849 }
1850
1851unlock:
1852 spin_unlock(&br->multicast_lock);
1853
1854 return err;
1855}
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/export.h>
15#include <linux/if_ether.h>
16#include <linux/igmp.h>
17#include <linux/jhash.h>
18#include <linux/kernel.h>
19#include <linux/log2.h>
20#include <linux/netdevice.h>
21#include <linux/netfilter_bridge.h>
22#include <linux/random.h>
23#include <linux/rculist.h>
24#include <linux/skbuff.h>
25#include <linux/slab.h>
26#include <linux/timer.h>
27#include <linux/inetdevice.h>
28#include <linux/mroute.h>
29#include <net/ip.h>
30#if IS_ENABLED(CONFIG_IPV6)
31#include <net/ipv6.h>
32#include <net/mld.h>
33#include <net/ip6_checksum.h>
34#include <net/addrconf.h>
35#endif
36
37#include "br_private.h"
38
39static void br_multicast_start_querier(struct net_bridge *br,
40 struct bridge_mcast_own_query *query);
41static void br_multicast_add_router(struct net_bridge *br,
42 struct net_bridge_port *port);
43static void br_ip4_multicast_leave_group(struct net_bridge *br,
44 struct net_bridge_port *port,
45 __be32 group,
46 __u16 vid);
47#if IS_ENABLED(CONFIG_IPV6)
48static void br_ip6_multicast_leave_group(struct net_bridge *br,
49 struct net_bridge_port *port,
50 const struct in6_addr *group,
51 __u16 vid);
52#endif
53unsigned int br_mdb_rehash_seq;
54
55static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
56{
57 if (a->proto != b->proto)
58 return 0;
59 if (a->vid != b->vid)
60 return 0;
61 switch (a->proto) {
62 case htons(ETH_P_IP):
63 return a->u.ip4 == b->u.ip4;
64#if IS_ENABLED(CONFIG_IPV6)
65 case htons(ETH_P_IPV6):
66 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
67#endif
68 }
69 return 0;
70}
71
72static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
73 __u16 vid)
74{
75 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
76}
77
78#if IS_ENABLED(CONFIG_IPV6)
79static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
80 const struct in6_addr *ip,
81 __u16 vid)
82{
83 return jhash_2words(ipv6_addr_hash(ip), vid,
84 mdb->secret) & (mdb->max - 1);
85}
86#endif
87
88static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
89 struct br_ip *ip)
90{
91 switch (ip->proto) {
92 case htons(ETH_P_IP):
93 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
94#if IS_ENABLED(CONFIG_IPV6)
95 case htons(ETH_P_IPV6):
96 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
97#endif
98 }
99 return 0;
100}
101
102static struct net_bridge_mdb_entry *__br_mdb_ip_get(
103 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
104{
105 struct net_bridge_mdb_entry *mp;
106
107 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
108 if (br_ip_equal(&mp->addr, dst))
109 return mp;
110 }
111
112 return NULL;
113}
114
115struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
116 struct br_ip *dst)
117{
118 if (!mdb)
119 return NULL;
120
121 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
122}
123
124static struct net_bridge_mdb_entry *br_mdb_ip4_get(
125 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
126{
127 struct br_ip br_dst;
128
129 br_dst.u.ip4 = dst;
130 br_dst.proto = htons(ETH_P_IP);
131 br_dst.vid = vid;
132
133 return br_mdb_ip_get(mdb, &br_dst);
134}
135
136#if IS_ENABLED(CONFIG_IPV6)
137static struct net_bridge_mdb_entry *br_mdb_ip6_get(
138 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
139 __u16 vid)
140{
141 struct br_ip br_dst;
142
143 br_dst.u.ip6 = *dst;
144 br_dst.proto = htons(ETH_P_IPV6);
145 br_dst.vid = vid;
146
147 return br_mdb_ip_get(mdb, &br_dst);
148}
149#endif
150
151struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
152 struct sk_buff *skb, u16 vid)
153{
154 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
155 struct br_ip ip;
156
157 if (br->multicast_disabled)
158 return NULL;
159
160 if (BR_INPUT_SKB_CB(skb)->igmp)
161 return NULL;
162
163 ip.proto = skb->protocol;
164 ip.vid = vid;
165
166 switch (skb->protocol) {
167 case htons(ETH_P_IP):
168 ip.u.ip4 = ip_hdr(skb)->daddr;
169 break;
170#if IS_ENABLED(CONFIG_IPV6)
171 case htons(ETH_P_IPV6):
172 ip.u.ip6 = ipv6_hdr(skb)->daddr;
173 break;
174#endif
175 default:
176 return NULL;
177 }
178
179 return br_mdb_ip_get(mdb, &ip);
180}
181
182static void br_mdb_free(struct rcu_head *head)
183{
184 struct net_bridge_mdb_htable *mdb =
185 container_of(head, struct net_bridge_mdb_htable, rcu);
186 struct net_bridge_mdb_htable *old = mdb->old;
187
188 mdb->old = NULL;
189 kfree(old->mhash);
190 kfree(old);
191}
192
193static int br_mdb_copy(struct net_bridge_mdb_htable *new,
194 struct net_bridge_mdb_htable *old,
195 int elasticity)
196{
197 struct net_bridge_mdb_entry *mp;
198 int maxlen;
199 int len;
200 int i;
201
202 for (i = 0; i < old->max; i++)
203 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
204 hlist_add_head(&mp->hlist[new->ver],
205 &new->mhash[br_ip_hash(new, &mp->addr)]);
206
207 if (!elasticity)
208 return 0;
209
210 maxlen = 0;
211 for (i = 0; i < new->max; i++) {
212 len = 0;
213 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
214 len++;
215 if (len > maxlen)
216 maxlen = len;
217 }
218
219 return maxlen > elasticity ? -EINVAL : 0;
220}
221
222void br_multicast_free_pg(struct rcu_head *head)
223{
224 struct net_bridge_port_group *p =
225 container_of(head, struct net_bridge_port_group, rcu);
226
227 kfree(p);
228}
229
230static void br_multicast_free_group(struct rcu_head *head)
231{
232 struct net_bridge_mdb_entry *mp =
233 container_of(head, struct net_bridge_mdb_entry, rcu);
234
235 kfree(mp);
236}
237
238static void br_multicast_group_expired(unsigned long data)
239{
240 struct net_bridge_mdb_entry *mp = (void *)data;
241 struct net_bridge *br = mp->br;
242 struct net_bridge_mdb_htable *mdb;
243
244 spin_lock(&br->multicast_lock);
245 if (!netif_running(br->dev) || timer_pending(&mp->timer))
246 goto out;
247
248 mp->mglist = false;
249
250 if (mp->ports)
251 goto out;
252
253 mdb = mlock_dereference(br->mdb, br);
254
255 hlist_del_rcu(&mp->hlist[mdb->ver]);
256 mdb->size--;
257
258 call_rcu_bh(&mp->rcu, br_multicast_free_group);
259
260out:
261 spin_unlock(&br->multicast_lock);
262}
263
264static void br_multicast_del_pg(struct net_bridge *br,
265 struct net_bridge_port_group *pg)
266{
267 struct net_bridge_mdb_htable *mdb;
268 struct net_bridge_mdb_entry *mp;
269 struct net_bridge_port_group *p;
270 struct net_bridge_port_group __rcu **pp;
271
272 mdb = mlock_dereference(br->mdb, br);
273
274 mp = br_mdb_ip_get(mdb, &pg->addr);
275 if (WARN_ON(!mp))
276 return;
277
278 for (pp = &mp->ports;
279 (p = mlock_dereference(*pp, br)) != NULL;
280 pp = &p->next) {
281 if (p != pg)
282 continue;
283
284 rcu_assign_pointer(*pp, p->next);
285 hlist_del_init(&p->mglist);
286 del_timer(&p->timer);
287 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
288 p->flags);
289 call_rcu_bh(&p->rcu, br_multicast_free_pg);
290
291 if (!mp->ports && !mp->mglist &&
292 netif_running(br->dev))
293 mod_timer(&mp->timer, jiffies);
294
295 return;
296 }
297
298 WARN_ON(1);
299}
300
301static void br_multicast_port_group_expired(unsigned long data)
302{
303 struct net_bridge_port_group *pg = (void *)data;
304 struct net_bridge *br = pg->port->br;
305
306 spin_lock(&br->multicast_lock);
307 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
308 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
309 goto out;
310
311 br_multicast_del_pg(br, pg);
312
313out:
314 spin_unlock(&br->multicast_lock);
315}
316
317static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
318 int elasticity)
319{
320 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
321 struct net_bridge_mdb_htable *mdb;
322 int err;
323
324 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
325 if (!mdb)
326 return -ENOMEM;
327
328 mdb->max = max;
329 mdb->old = old;
330
331 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
332 if (!mdb->mhash) {
333 kfree(mdb);
334 return -ENOMEM;
335 }
336
337 mdb->size = old ? old->size : 0;
338 mdb->ver = old ? old->ver ^ 1 : 0;
339
340 if (!old || elasticity)
341 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
342 else
343 mdb->secret = old->secret;
344
345 if (!old)
346 goto out;
347
348 err = br_mdb_copy(mdb, old, elasticity);
349 if (err) {
350 kfree(mdb->mhash);
351 kfree(mdb);
352 return err;
353 }
354
355 br_mdb_rehash_seq++;
356 call_rcu_bh(&mdb->rcu, br_mdb_free);
357
358out:
359 rcu_assign_pointer(*mdbp, mdb);
360
361 return 0;
362}
363
364static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
365 __be32 group,
366 u8 *igmp_type)
367{
368 struct igmpv3_query *ihv3;
369 size_t igmp_hdr_size;
370 struct sk_buff *skb;
371 struct igmphdr *ih;
372 struct ethhdr *eth;
373 struct iphdr *iph;
374
375 igmp_hdr_size = sizeof(*ih);
376 if (br->multicast_igmp_version == 3)
377 igmp_hdr_size = sizeof(*ihv3);
378 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
379 igmp_hdr_size + 4);
380 if (!skb)
381 goto out;
382
383 skb->protocol = htons(ETH_P_IP);
384
385 skb_reset_mac_header(skb);
386 eth = eth_hdr(skb);
387
388 ether_addr_copy(eth->h_source, br->dev->dev_addr);
389 eth->h_dest[0] = 1;
390 eth->h_dest[1] = 0;
391 eth->h_dest[2] = 0x5e;
392 eth->h_dest[3] = 0;
393 eth->h_dest[4] = 0;
394 eth->h_dest[5] = 1;
395 eth->h_proto = htons(ETH_P_IP);
396 skb_put(skb, sizeof(*eth));
397
398 skb_set_network_header(skb, skb->len);
399 iph = ip_hdr(skb);
400
401 iph->version = 4;
402 iph->ihl = 6;
403 iph->tos = 0xc0;
404 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
405 iph->id = 0;
406 iph->frag_off = htons(IP_DF);
407 iph->ttl = 1;
408 iph->protocol = IPPROTO_IGMP;
409 iph->saddr = br->multicast_query_use_ifaddr ?
410 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
411 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
412 ((u8 *)&iph[1])[0] = IPOPT_RA;
413 ((u8 *)&iph[1])[1] = 4;
414 ((u8 *)&iph[1])[2] = 0;
415 ((u8 *)&iph[1])[3] = 0;
416 ip_send_check(iph);
417 skb_put(skb, 24);
418
419 skb_set_transport_header(skb, skb->len);
420 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
421
422 switch (br->multicast_igmp_version) {
423 case 2:
424 ih = igmp_hdr(skb);
425 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
426 ih->code = (group ? br->multicast_last_member_interval :
427 br->multicast_query_response_interval) /
428 (HZ / IGMP_TIMER_SCALE);
429 ih->group = group;
430 ih->csum = 0;
431 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
432 break;
433 case 3:
434 ihv3 = igmpv3_query_hdr(skb);
435 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
436 ihv3->code = (group ? br->multicast_last_member_interval :
437 br->multicast_query_response_interval) /
438 (HZ / IGMP_TIMER_SCALE);
439 ihv3->group = group;
440 ihv3->qqic = br->multicast_query_interval / HZ;
441 ihv3->nsrcs = 0;
442 ihv3->resv = 0;
443 ihv3->suppress = 0;
444 ihv3->qrv = 2;
445 ihv3->csum = 0;
446 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
447 break;
448 }
449
450 skb_put(skb, igmp_hdr_size);
451 __skb_pull(skb, sizeof(*eth));
452
453out:
454 return skb;
455}
456
457#if IS_ENABLED(CONFIG_IPV6)
458static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
459 const struct in6_addr *grp,
460 u8 *igmp_type)
461{
462 struct mld2_query *mld2q;
463 unsigned long interval;
464 struct ipv6hdr *ip6h;
465 struct mld_msg *mldq;
466 size_t mld_hdr_size;
467 struct sk_buff *skb;
468 struct ethhdr *eth;
469 u8 *hopopt;
470
471 mld_hdr_size = sizeof(*mldq);
472 if (br->multicast_mld_version == 2)
473 mld_hdr_size = sizeof(*mld2q);
474 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
475 8 + mld_hdr_size);
476 if (!skb)
477 goto out;
478
479 skb->protocol = htons(ETH_P_IPV6);
480
481 /* Ethernet header */
482 skb_reset_mac_header(skb);
483 eth = eth_hdr(skb);
484
485 ether_addr_copy(eth->h_source, br->dev->dev_addr);
486 eth->h_proto = htons(ETH_P_IPV6);
487 skb_put(skb, sizeof(*eth));
488
489 /* IPv6 header + HbH option */
490 skb_set_network_header(skb, skb->len);
491 ip6h = ipv6_hdr(skb);
492
493 *(__force __be32 *)ip6h = htonl(0x60000000);
494 ip6h->payload_len = htons(8 + mld_hdr_size);
495 ip6h->nexthdr = IPPROTO_HOPOPTS;
496 ip6h->hop_limit = 1;
497 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
498 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
499 &ip6h->saddr)) {
500 kfree_skb(skb);
501 br->has_ipv6_addr = 0;
502 return NULL;
503 }
504
505 br->has_ipv6_addr = 1;
506 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
507
508 hopopt = (u8 *)(ip6h + 1);
509 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
510 hopopt[1] = 0; /* length of HbH */
511 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
512 hopopt[3] = 2; /* Length of RA Option */
513 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
514 hopopt[5] = 0;
515 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
516 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
517
518 skb_put(skb, sizeof(*ip6h) + 8);
519
520 /* ICMPv6 */
521 skb_set_transport_header(skb, skb->len);
522 interval = ipv6_addr_any(grp) ?
523 br->multicast_query_response_interval :
524 br->multicast_last_member_interval;
525 *igmp_type = ICMPV6_MGM_QUERY;
526 switch (br->multicast_mld_version) {
527 case 1:
528 mldq = (struct mld_msg *)icmp6_hdr(skb);
529 mldq->mld_type = ICMPV6_MGM_QUERY;
530 mldq->mld_code = 0;
531 mldq->mld_cksum = 0;
532 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
533 mldq->mld_reserved = 0;
534 mldq->mld_mca = *grp;
535 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
536 sizeof(*mldq), IPPROTO_ICMPV6,
537 csum_partial(mldq,
538 sizeof(*mldq),
539 0));
540 break;
541 case 2:
542 mld2q = (struct mld2_query *)icmp6_hdr(skb);
543 mld2q->mld2q_mrc = ntohs((u16)jiffies_to_msecs(interval));
544 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
545 mld2q->mld2q_code = 0;
546 mld2q->mld2q_cksum = 0;
547 mld2q->mld2q_resv1 = 0;
548 mld2q->mld2q_resv2 = 0;
549 mld2q->mld2q_suppress = 0;
550 mld2q->mld2q_qrv = 2;
551 mld2q->mld2q_nsrcs = 0;
552 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
553 mld2q->mld2q_mca = *grp;
554 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
555 sizeof(*mld2q),
556 IPPROTO_ICMPV6,
557 csum_partial(mld2q,
558 sizeof(*mld2q),
559 0));
560 break;
561 }
562 skb_put(skb, mld_hdr_size);
563
564 __skb_pull(skb, sizeof(*eth));
565
566out:
567 return skb;
568}
569#endif
570
571static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
572 struct br_ip *addr,
573 u8 *igmp_type)
574{
575 switch (addr->proto) {
576 case htons(ETH_P_IP):
577 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
578#if IS_ENABLED(CONFIG_IPV6)
579 case htons(ETH_P_IPV6):
580 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
581 igmp_type);
582#endif
583 }
584 return NULL;
585}
586
587static struct net_bridge_mdb_entry *br_multicast_get_group(
588 struct net_bridge *br, struct net_bridge_port *port,
589 struct br_ip *group, int hash)
590{
591 struct net_bridge_mdb_htable *mdb;
592 struct net_bridge_mdb_entry *mp;
593 unsigned int count = 0;
594 unsigned int max;
595 int elasticity;
596 int err;
597
598 mdb = rcu_dereference_protected(br->mdb, 1);
599 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
600 count++;
601 if (unlikely(br_ip_equal(group, &mp->addr)))
602 return mp;
603 }
604
605 elasticity = 0;
606 max = mdb->max;
607
608 if (unlikely(count > br->hash_elasticity && count)) {
609 if (net_ratelimit())
610 br_info(br, "Multicast hash table "
611 "chain limit reached: %s\n",
612 port ? port->dev->name : br->dev->name);
613
614 elasticity = br->hash_elasticity;
615 }
616
617 if (mdb->size >= max) {
618 max *= 2;
619 if (unlikely(max > br->hash_max)) {
620 br_warn(br, "Multicast hash table maximum of %d "
621 "reached, disabling snooping: %s\n",
622 br->hash_max,
623 port ? port->dev->name : br->dev->name);
624 err = -E2BIG;
625disable:
626 br->multicast_disabled = 1;
627 goto err;
628 }
629 }
630
631 if (max > mdb->max || elasticity) {
632 if (mdb->old) {
633 if (net_ratelimit())
634 br_info(br, "Multicast hash table "
635 "on fire: %s\n",
636 port ? port->dev->name : br->dev->name);
637 err = -EEXIST;
638 goto err;
639 }
640
641 err = br_mdb_rehash(&br->mdb, max, elasticity);
642 if (err) {
643 br_warn(br, "Cannot rehash multicast "
644 "hash table, disabling snooping: %s, %d, %d\n",
645 port ? port->dev->name : br->dev->name,
646 mdb->size, err);
647 goto disable;
648 }
649
650 err = -EAGAIN;
651 goto err;
652 }
653
654 return NULL;
655
656err:
657 mp = ERR_PTR(err);
658 return mp;
659}
660
661struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
662 struct net_bridge_port *p,
663 struct br_ip *group)
664{
665 struct net_bridge_mdb_htable *mdb;
666 struct net_bridge_mdb_entry *mp;
667 int hash;
668 int err;
669
670 mdb = rcu_dereference_protected(br->mdb, 1);
671 if (!mdb) {
672 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
673 if (err)
674 return ERR_PTR(err);
675 goto rehash;
676 }
677
678 hash = br_ip_hash(mdb, group);
679 mp = br_multicast_get_group(br, p, group, hash);
680 switch (PTR_ERR(mp)) {
681 case 0:
682 break;
683
684 case -EAGAIN:
685rehash:
686 mdb = rcu_dereference_protected(br->mdb, 1);
687 hash = br_ip_hash(mdb, group);
688 break;
689
690 default:
691 goto out;
692 }
693
694 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
695 if (unlikely(!mp))
696 return ERR_PTR(-ENOMEM);
697
698 mp->br = br;
699 mp->addr = *group;
700 setup_timer(&mp->timer, br_multicast_group_expired,
701 (unsigned long)mp);
702
703 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
704 mdb->size++;
705
706out:
707 return mp;
708}
709
710struct net_bridge_port_group *br_multicast_new_port_group(
711 struct net_bridge_port *port,
712 struct br_ip *group,
713 struct net_bridge_port_group __rcu *next,
714 unsigned char flags)
715{
716 struct net_bridge_port_group *p;
717
718 p = kzalloc(sizeof(*p), GFP_ATOMIC);
719 if (unlikely(!p))
720 return NULL;
721
722 p->addr = *group;
723 p->port = port;
724 p->flags = flags;
725 rcu_assign_pointer(p->next, next);
726 hlist_add_head(&p->mglist, &port->mglist);
727 setup_timer(&p->timer, br_multicast_port_group_expired,
728 (unsigned long)p);
729 return p;
730}
731
732static int br_multicast_add_group(struct net_bridge *br,
733 struct net_bridge_port *port,
734 struct br_ip *group)
735{
736 struct net_bridge_port_group __rcu **pp;
737 struct net_bridge_port_group *p;
738 struct net_bridge_mdb_entry *mp;
739 unsigned long now = jiffies;
740 int err;
741
742 spin_lock(&br->multicast_lock);
743 if (!netif_running(br->dev) ||
744 (port && port->state == BR_STATE_DISABLED))
745 goto out;
746
747 mp = br_multicast_new_group(br, port, group);
748 err = PTR_ERR(mp);
749 if (IS_ERR(mp))
750 goto err;
751
752 if (!port) {
753 mp->mglist = true;
754 mod_timer(&mp->timer, now + br->multicast_membership_interval);
755 goto out;
756 }
757
758 for (pp = &mp->ports;
759 (p = mlock_dereference(*pp, br)) != NULL;
760 pp = &p->next) {
761 if (p->port == port)
762 goto found;
763 if ((unsigned long)p->port < (unsigned long)port)
764 break;
765 }
766
767 p = br_multicast_new_port_group(port, group, *pp, 0);
768 if (unlikely(!p))
769 goto err;
770 rcu_assign_pointer(*pp, p);
771 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
772
773found:
774 mod_timer(&p->timer, now + br->multicast_membership_interval);
775out:
776 err = 0;
777
778err:
779 spin_unlock(&br->multicast_lock);
780 return err;
781}
782
783static int br_ip4_multicast_add_group(struct net_bridge *br,
784 struct net_bridge_port *port,
785 __be32 group,
786 __u16 vid)
787{
788 struct br_ip br_group;
789
790 if (ipv4_is_local_multicast(group))
791 return 0;
792
793 br_group.u.ip4 = group;
794 br_group.proto = htons(ETH_P_IP);
795 br_group.vid = vid;
796
797 return br_multicast_add_group(br, port, &br_group);
798}
799
800#if IS_ENABLED(CONFIG_IPV6)
801static int br_ip6_multicast_add_group(struct net_bridge *br,
802 struct net_bridge_port *port,
803 const struct in6_addr *group,
804 __u16 vid)
805{
806 struct br_ip br_group;
807
808 if (ipv6_addr_is_ll_all_nodes(group))
809 return 0;
810
811 br_group.u.ip6 = *group;
812 br_group.proto = htons(ETH_P_IPV6);
813 br_group.vid = vid;
814
815 return br_multicast_add_group(br, port, &br_group);
816}
817#endif
818
819static void br_multicast_router_expired(unsigned long data)
820{
821 struct net_bridge_port *port = (void *)data;
822 struct net_bridge *br = port->br;
823
824 spin_lock(&br->multicast_lock);
825 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
826 port->multicast_router == MDB_RTR_TYPE_PERM ||
827 timer_pending(&port->multicast_router_timer) ||
828 hlist_unhashed(&port->rlist))
829 goto out;
830
831 hlist_del_init_rcu(&port->rlist);
832 br_rtr_notify(br->dev, port, RTM_DELMDB);
833 /* Don't allow timer refresh if the router expired */
834 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
835 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
836
837out:
838 spin_unlock(&br->multicast_lock);
839}
840
841static void br_multicast_local_router_expired(unsigned long data)
842{
843}
844
845static void br_multicast_querier_expired(struct net_bridge *br,
846 struct bridge_mcast_own_query *query)
847{
848 spin_lock(&br->multicast_lock);
849 if (!netif_running(br->dev) || br->multicast_disabled)
850 goto out;
851
852 br_multicast_start_querier(br, query);
853
854out:
855 spin_unlock(&br->multicast_lock);
856}
857
858static void br_ip4_multicast_querier_expired(unsigned long data)
859{
860 struct net_bridge *br = (void *)data;
861
862 br_multicast_querier_expired(br, &br->ip4_own_query);
863}
864
865#if IS_ENABLED(CONFIG_IPV6)
866static void br_ip6_multicast_querier_expired(unsigned long data)
867{
868 struct net_bridge *br = (void *)data;
869
870 br_multicast_querier_expired(br, &br->ip6_own_query);
871}
872#endif
873
874static void br_multicast_select_own_querier(struct net_bridge *br,
875 struct br_ip *ip,
876 struct sk_buff *skb)
877{
878 if (ip->proto == htons(ETH_P_IP))
879 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
880#if IS_ENABLED(CONFIG_IPV6)
881 else
882 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
883#endif
884}
885
886static void __br_multicast_send_query(struct net_bridge *br,
887 struct net_bridge_port *port,
888 struct br_ip *ip)
889{
890 struct sk_buff *skb;
891 u8 igmp_type;
892
893 skb = br_multicast_alloc_query(br, ip, &igmp_type);
894 if (!skb)
895 return;
896
897 if (port) {
898 skb->dev = port->dev;
899 br_multicast_count(br, port, skb, igmp_type,
900 BR_MCAST_DIR_TX);
901 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
902 dev_net(port->dev), NULL, skb, NULL, skb->dev,
903 br_dev_queue_push_xmit);
904 } else {
905 br_multicast_select_own_querier(br, ip, skb);
906 br_multicast_count(br, port, skb, igmp_type,
907 BR_MCAST_DIR_RX);
908 netif_rx(skb);
909 }
910}
911
912static void br_multicast_send_query(struct net_bridge *br,
913 struct net_bridge_port *port,
914 struct bridge_mcast_own_query *own_query)
915{
916 struct bridge_mcast_other_query *other_query = NULL;
917 struct br_ip br_group;
918 unsigned long time;
919
920 if (!netif_running(br->dev) || br->multicast_disabled ||
921 !br->multicast_querier)
922 return;
923
924 memset(&br_group.u, 0, sizeof(br_group.u));
925
926 if (port ? (own_query == &port->ip4_own_query) :
927 (own_query == &br->ip4_own_query)) {
928 other_query = &br->ip4_other_query;
929 br_group.proto = htons(ETH_P_IP);
930#if IS_ENABLED(CONFIG_IPV6)
931 } else {
932 other_query = &br->ip6_other_query;
933 br_group.proto = htons(ETH_P_IPV6);
934#endif
935 }
936
937 if (!other_query || timer_pending(&other_query->timer))
938 return;
939
940 __br_multicast_send_query(br, port, &br_group);
941
942 time = jiffies;
943 time += own_query->startup_sent < br->multicast_startup_query_count ?
944 br->multicast_startup_query_interval :
945 br->multicast_query_interval;
946 mod_timer(&own_query->timer, time);
947}
948
949static void
950br_multicast_port_query_expired(struct net_bridge_port *port,
951 struct bridge_mcast_own_query *query)
952{
953 struct net_bridge *br = port->br;
954
955 spin_lock(&br->multicast_lock);
956 if (port->state == BR_STATE_DISABLED ||
957 port->state == BR_STATE_BLOCKING)
958 goto out;
959
960 if (query->startup_sent < br->multicast_startup_query_count)
961 query->startup_sent++;
962
963 br_multicast_send_query(port->br, port, query);
964
965out:
966 spin_unlock(&br->multicast_lock);
967}
968
969static void br_ip4_multicast_port_query_expired(unsigned long data)
970{
971 struct net_bridge_port *port = (void *)data;
972
973 br_multicast_port_query_expired(port, &port->ip4_own_query);
974}
975
976#if IS_ENABLED(CONFIG_IPV6)
977static void br_ip6_multicast_port_query_expired(unsigned long data)
978{
979 struct net_bridge_port *port = (void *)data;
980
981 br_multicast_port_query_expired(port, &port->ip6_own_query);
982}
983#endif
984
985int br_multicast_add_port(struct net_bridge_port *port)
986{
987 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
988
989 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
990 (unsigned long)port);
991 setup_timer(&port->ip4_own_query.timer,
992 br_ip4_multicast_port_query_expired, (unsigned long)port);
993#if IS_ENABLED(CONFIG_IPV6)
994 setup_timer(&port->ip6_own_query.timer,
995 br_ip6_multicast_port_query_expired, (unsigned long)port);
996#endif
997 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
998 if (!port->mcast_stats)
999 return -ENOMEM;
1000
1001 return 0;
1002}
1003
1004void br_multicast_del_port(struct net_bridge_port *port)
1005{
1006 struct net_bridge *br = port->br;
1007 struct net_bridge_port_group *pg;
1008 struct hlist_node *n;
1009
1010 /* Take care of the remaining groups, only perm ones should be left */
1011 spin_lock_bh(&br->multicast_lock);
1012 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1013 br_multicast_del_pg(br, pg);
1014 spin_unlock_bh(&br->multicast_lock);
1015 del_timer_sync(&port->multicast_router_timer);
1016 free_percpu(port->mcast_stats);
1017}
1018
1019static void br_multicast_enable(struct bridge_mcast_own_query *query)
1020{
1021 query->startup_sent = 0;
1022
1023 if (try_to_del_timer_sync(&query->timer) >= 0 ||
1024 del_timer(&query->timer))
1025 mod_timer(&query->timer, jiffies);
1026}
1027
1028static void __br_multicast_enable_port(struct net_bridge_port *port)
1029{
1030 struct net_bridge *br = port->br;
1031
1032 if (br->multicast_disabled || !netif_running(br->dev))
1033 return;
1034
1035 br_multicast_enable(&port->ip4_own_query);
1036#if IS_ENABLED(CONFIG_IPV6)
1037 br_multicast_enable(&port->ip6_own_query);
1038#endif
1039 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1040 hlist_unhashed(&port->rlist))
1041 br_multicast_add_router(br, port);
1042}
1043
1044void br_multicast_enable_port(struct net_bridge_port *port)
1045{
1046 struct net_bridge *br = port->br;
1047
1048 spin_lock(&br->multicast_lock);
1049 __br_multicast_enable_port(port);
1050 spin_unlock(&br->multicast_lock);
1051}
1052
1053void br_multicast_disable_port(struct net_bridge_port *port)
1054{
1055 struct net_bridge *br = port->br;
1056 struct net_bridge_port_group *pg;
1057 struct hlist_node *n;
1058
1059 spin_lock(&br->multicast_lock);
1060 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1061 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1062 br_multicast_del_pg(br, pg);
1063
1064 if (!hlist_unhashed(&port->rlist)) {
1065 hlist_del_init_rcu(&port->rlist);
1066 br_rtr_notify(br->dev, port, RTM_DELMDB);
1067 /* Don't allow timer refresh if disabling */
1068 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
1069 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1070 }
1071 del_timer(&port->multicast_router_timer);
1072 del_timer(&port->ip4_own_query.timer);
1073#if IS_ENABLED(CONFIG_IPV6)
1074 del_timer(&port->ip6_own_query.timer);
1075#endif
1076 spin_unlock(&br->multicast_lock);
1077}
1078
1079static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1080 struct net_bridge_port *port,
1081 struct sk_buff *skb,
1082 u16 vid)
1083{
1084 struct igmpv3_report *ih;
1085 struct igmpv3_grec *grec;
1086 int i;
1087 int len;
1088 int num;
1089 int type;
1090 int err = 0;
1091 __be32 group;
1092
1093 ih = igmpv3_report_hdr(skb);
1094 num = ntohs(ih->ngrec);
1095 len = skb_transport_offset(skb) + sizeof(*ih);
1096
1097 for (i = 0; i < num; i++) {
1098 len += sizeof(*grec);
1099 if (!pskb_may_pull(skb, len))
1100 return -EINVAL;
1101
1102 grec = (void *)(skb->data + len - sizeof(*grec));
1103 group = grec->grec_mca;
1104 type = grec->grec_type;
1105
1106 len += ntohs(grec->grec_nsrcs) * 4;
1107 if (!pskb_may_pull(skb, len))
1108 return -EINVAL;
1109
1110 /* We treat this as an IGMPv2 report for now. */
1111 switch (type) {
1112 case IGMPV3_MODE_IS_INCLUDE:
1113 case IGMPV3_MODE_IS_EXCLUDE:
1114 case IGMPV3_CHANGE_TO_INCLUDE:
1115 case IGMPV3_CHANGE_TO_EXCLUDE:
1116 case IGMPV3_ALLOW_NEW_SOURCES:
1117 case IGMPV3_BLOCK_OLD_SOURCES:
1118 break;
1119
1120 default:
1121 continue;
1122 }
1123
1124 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1125 type == IGMPV3_MODE_IS_INCLUDE) &&
1126 ntohs(grec->grec_nsrcs) == 0) {
1127 br_ip4_multicast_leave_group(br, port, group, vid);
1128 } else {
1129 err = br_ip4_multicast_add_group(br, port, group, vid);
1130 if (err)
1131 break;
1132 }
1133 }
1134
1135 return err;
1136}
1137
1138#if IS_ENABLED(CONFIG_IPV6)
1139static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1140 struct net_bridge_port *port,
1141 struct sk_buff *skb,
1142 u16 vid)
1143{
1144 struct icmp6hdr *icmp6h;
1145 struct mld2_grec *grec;
1146 int i;
1147 int len;
1148 int num;
1149 int err = 0;
1150
1151 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1152 return -EINVAL;
1153
1154 icmp6h = icmp6_hdr(skb);
1155 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1156 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1157
1158 for (i = 0; i < num; i++) {
1159 __be16 *nsrcs, _nsrcs;
1160
1161 nsrcs = skb_header_pointer(skb,
1162 len + offsetof(struct mld2_grec,
1163 grec_nsrcs),
1164 sizeof(_nsrcs), &_nsrcs);
1165 if (!nsrcs)
1166 return -EINVAL;
1167
1168 if (!pskb_may_pull(skb,
1169 len + sizeof(*grec) +
1170 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1171 return -EINVAL;
1172
1173 grec = (struct mld2_grec *)(skb->data + len);
1174 len += sizeof(*grec) +
1175 sizeof(struct in6_addr) * ntohs(*nsrcs);
1176
1177 /* We treat these as MLDv1 reports for now. */
1178 switch (grec->grec_type) {
1179 case MLD2_MODE_IS_INCLUDE:
1180 case MLD2_MODE_IS_EXCLUDE:
1181 case MLD2_CHANGE_TO_INCLUDE:
1182 case MLD2_CHANGE_TO_EXCLUDE:
1183 case MLD2_ALLOW_NEW_SOURCES:
1184 case MLD2_BLOCK_OLD_SOURCES:
1185 break;
1186
1187 default:
1188 continue;
1189 }
1190
1191 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1192 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1193 ntohs(*nsrcs) == 0) {
1194 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1195 vid);
1196 } else {
1197 err = br_ip6_multicast_add_group(br, port,
1198 &grec->grec_mca, vid);
1199 if (err)
1200 break;
1201 }
1202 }
1203
1204 return err;
1205}
1206#endif
1207
1208static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1209 struct net_bridge_port *port,
1210 __be32 saddr)
1211{
1212 if (!timer_pending(&br->ip4_own_query.timer) &&
1213 !timer_pending(&br->ip4_other_query.timer))
1214 goto update;
1215
1216 if (!br->ip4_querier.addr.u.ip4)
1217 goto update;
1218
1219 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1220 goto update;
1221
1222 return false;
1223
1224update:
1225 br->ip4_querier.addr.u.ip4 = saddr;
1226
1227 /* update protected by general multicast_lock by caller */
1228 rcu_assign_pointer(br->ip4_querier.port, port);
1229
1230 return true;
1231}
1232
1233#if IS_ENABLED(CONFIG_IPV6)
1234static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1235 struct net_bridge_port *port,
1236 struct in6_addr *saddr)
1237{
1238 if (!timer_pending(&br->ip6_own_query.timer) &&
1239 !timer_pending(&br->ip6_other_query.timer))
1240 goto update;
1241
1242 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1243 goto update;
1244
1245 return false;
1246
1247update:
1248 br->ip6_querier.addr.u.ip6 = *saddr;
1249
1250 /* update protected by general multicast_lock by caller */
1251 rcu_assign_pointer(br->ip6_querier.port, port);
1252
1253 return true;
1254}
1255#endif
1256
1257static bool br_multicast_select_querier(struct net_bridge *br,
1258 struct net_bridge_port *port,
1259 struct br_ip *saddr)
1260{
1261 switch (saddr->proto) {
1262 case htons(ETH_P_IP):
1263 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1264#if IS_ENABLED(CONFIG_IPV6)
1265 case htons(ETH_P_IPV6):
1266 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1267#endif
1268 }
1269
1270 return false;
1271}
1272
1273static void
1274br_multicast_update_query_timer(struct net_bridge *br,
1275 struct bridge_mcast_other_query *query,
1276 unsigned long max_delay)
1277{
1278 if (!timer_pending(&query->timer))
1279 query->delay_time = jiffies + max_delay;
1280
1281 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1282}
1283
1284/*
1285 * Add port to router_list
1286 * list is maintained ordered by pointer value
1287 * and locked by br->multicast_lock and RCU
1288 */
1289static void br_multicast_add_router(struct net_bridge *br,
1290 struct net_bridge_port *port)
1291{
1292 struct net_bridge_port *p;
1293 struct hlist_node *slot = NULL;
1294
1295 if (!hlist_unhashed(&port->rlist))
1296 return;
1297
1298 hlist_for_each_entry(p, &br->router_list, rlist) {
1299 if ((unsigned long) port >= (unsigned long) p)
1300 break;
1301 slot = &p->rlist;
1302 }
1303
1304 if (slot)
1305 hlist_add_behind_rcu(&port->rlist, slot);
1306 else
1307 hlist_add_head_rcu(&port->rlist, &br->router_list);
1308 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1309}
1310
1311static void br_multicast_mark_router(struct net_bridge *br,
1312 struct net_bridge_port *port)
1313{
1314 unsigned long now = jiffies;
1315
1316 if (!port) {
1317 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1318 mod_timer(&br->multicast_router_timer,
1319 now + br->multicast_querier_interval);
1320 return;
1321 }
1322
1323 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1324 port->multicast_router == MDB_RTR_TYPE_PERM)
1325 return;
1326
1327 br_multicast_add_router(br, port);
1328
1329 mod_timer(&port->multicast_router_timer,
1330 now + br->multicast_querier_interval);
1331}
1332
1333static void br_multicast_query_received(struct net_bridge *br,
1334 struct net_bridge_port *port,
1335 struct bridge_mcast_other_query *query,
1336 struct br_ip *saddr,
1337 unsigned long max_delay)
1338{
1339 if (!br_multicast_select_querier(br, port, saddr))
1340 return;
1341
1342 br_multicast_update_query_timer(br, query, max_delay);
1343 br_multicast_mark_router(br, port);
1344}
1345
1346static int br_ip4_multicast_query(struct net_bridge *br,
1347 struct net_bridge_port *port,
1348 struct sk_buff *skb,
1349 u16 vid)
1350{
1351 const struct iphdr *iph = ip_hdr(skb);
1352 struct igmphdr *ih = igmp_hdr(skb);
1353 struct net_bridge_mdb_entry *mp;
1354 struct igmpv3_query *ih3;
1355 struct net_bridge_port_group *p;
1356 struct net_bridge_port_group __rcu **pp;
1357 struct br_ip saddr;
1358 unsigned long max_delay;
1359 unsigned long now = jiffies;
1360 unsigned int offset = skb_transport_offset(skb);
1361 __be32 group;
1362 int err = 0;
1363
1364 spin_lock(&br->multicast_lock);
1365 if (!netif_running(br->dev) ||
1366 (port && port->state == BR_STATE_DISABLED))
1367 goto out;
1368
1369 group = ih->group;
1370
1371 if (skb->len == offset + sizeof(*ih)) {
1372 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1373
1374 if (!max_delay) {
1375 max_delay = 10 * HZ;
1376 group = 0;
1377 }
1378 } else if (skb->len >= offset + sizeof(*ih3)) {
1379 ih3 = igmpv3_query_hdr(skb);
1380 if (ih3->nsrcs)
1381 goto out;
1382
1383 max_delay = ih3->code ?
1384 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1385 } else {
1386 goto out;
1387 }
1388
1389 if (!group) {
1390 saddr.proto = htons(ETH_P_IP);
1391 saddr.u.ip4 = iph->saddr;
1392
1393 br_multicast_query_received(br, port, &br->ip4_other_query,
1394 &saddr, max_delay);
1395 goto out;
1396 }
1397
1398 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1399 if (!mp)
1400 goto out;
1401
1402 max_delay *= br->multicast_last_member_count;
1403
1404 if (mp->mglist &&
1405 (timer_pending(&mp->timer) ?
1406 time_after(mp->timer.expires, now + max_delay) :
1407 try_to_del_timer_sync(&mp->timer) >= 0))
1408 mod_timer(&mp->timer, now + max_delay);
1409
1410 for (pp = &mp->ports;
1411 (p = mlock_dereference(*pp, br)) != NULL;
1412 pp = &p->next) {
1413 if (timer_pending(&p->timer) ?
1414 time_after(p->timer.expires, now + max_delay) :
1415 try_to_del_timer_sync(&p->timer) >= 0)
1416 mod_timer(&p->timer, now + max_delay);
1417 }
1418
1419out:
1420 spin_unlock(&br->multicast_lock);
1421 return err;
1422}
1423
1424#if IS_ENABLED(CONFIG_IPV6)
1425static int br_ip6_multicast_query(struct net_bridge *br,
1426 struct net_bridge_port *port,
1427 struct sk_buff *skb,
1428 u16 vid)
1429{
1430 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1431 struct mld_msg *mld;
1432 struct net_bridge_mdb_entry *mp;
1433 struct mld2_query *mld2q;
1434 struct net_bridge_port_group *p;
1435 struct net_bridge_port_group __rcu **pp;
1436 struct br_ip saddr;
1437 unsigned long max_delay;
1438 unsigned long now = jiffies;
1439 unsigned int offset = skb_transport_offset(skb);
1440 const struct in6_addr *group = NULL;
1441 bool is_general_query;
1442 int err = 0;
1443
1444 spin_lock(&br->multicast_lock);
1445 if (!netif_running(br->dev) ||
1446 (port && port->state == BR_STATE_DISABLED))
1447 goto out;
1448
1449 if (skb->len == offset + sizeof(*mld)) {
1450 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1451 err = -EINVAL;
1452 goto out;
1453 }
1454 mld = (struct mld_msg *) icmp6_hdr(skb);
1455 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1456 if (max_delay)
1457 group = &mld->mld_mca;
1458 } else {
1459 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1460 err = -EINVAL;
1461 goto out;
1462 }
1463 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1464 if (!mld2q->mld2q_nsrcs)
1465 group = &mld2q->mld2q_mca;
1466
1467 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1468 }
1469
1470 is_general_query = group && ipv6_addr_any(group);
1471
1472 if (is_general_query) {
1473 saddr.proto = htons(ETH_P_IPV6);
1474 saddr.u.ip6 = ip6h->saddr;
1475
1476 br_multicast_query_received(br, port, &br->ip6_other_query,
1477 &saddr, max_delay);
1478 goto out;
1479 } else if (!group) {
1480 goto out;
1481 }
1482
1483 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1484 if (!mp)
1485 goto out;
1486
1487 max_delay *= br->multicast_last_member_count;
1488 if (mp->mglist &&
1489 (timer_pending(&mp->timer) ?
1490 time_after(mp->timer.expires, now + max_delay) :
1491 try_to_del_timer_sync(&mp->timer) >= 0))
1492 mod_timer(&mp->timer, now + max_delay);
1493
1494 for (pp = &mp->ports;
1495 (p = mlock_dereference(*pp, br)) != NULL;
1496 pp = &p->next) {
1497 if (timer_pending(&p->timer) ?
1498 time_after(p->timer.expires, now + max_delay) :
1499 try_to_del_timer_sync(&p->timer) >= 0)
1500 mod_timer(&p->timer, now + max_delay);
1501 }
1502
1503out:
1504 spin_unlock(&br->multicast_lock);
1505 return err;
1506}
1507#endif
1508
1509static void
1510br_multicast_leave_group(struct net_bridge *br,
1511 struct net_bridge_port *port,
1512 struct br_ip *group,
1513 struct bridge_mcast_other_query *other_query,
1514 struct bridge_mcast_own_query *own_query)
1515{
1516 struct net_bridge_mdb_htable *mdb;
1517 struct net_bridge_mdb_entry *mp;
1518 struct net_bridge_port_group *p;
1519 unsigned long now;
1520 unsigned long time;
1521
1522 spin_lock(&br->multicast_lock);
1523 if (!netif_running(br->dev) ||
1524 (port && port->state == BR_STATE_DISABLED))
1525 goto out;
1526
1527 mdb = mlock_dereference(br->mdb, br);
1528 mp = br_mdb_ip_get(mdb, group);
1529 if (!mp)
1530 goto out;
1531
1532 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1533 struct net_bridge_port_group __rcu **pp;
1534
1535 for (pp = &mp->ports;
1536 (p = mlock_dereference(*pp, br)) != NULL;
1537 pp = &p->next) {
1538 if (p->port != port)
1539 continue;
1540
1541 rcu_assign_pointer(*pp, p->next);
1542 hlist_del_init(&p->mglist);
1543 del_timer(&p->timer);
1544 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1545 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1546 p->flags);
1547
1548 if (!mp->ports && !mp->mglist &&
1549 netif_running(br->dev))
1550 mod_timer(&mp->timer, jiffies);
1551 }
1552 goto out;
1553 }
1554
1555 if (timer_pending(&other_query->timer))
1556 goto out;
1557
1558 if (br->multicast_querier) {
1559 __br_multicast_send_query(br, port, &mp->addr);
1560
1561 time = jiffies + br->multicast_last_member_count *
1562 br->multicast_last_member_interval;
1563
1564 mod_timer(&own_query->timer, time);
1565
1566 for (p = mlock_dereference(mp->ports, br);
1567 p != NULL;
1568 p = mlock_dereference(p->next, br)) {
1569 if (p->port != port)
1570 continue;
1571
1572 if (!hlist_unhashed(&p->mglist) &&
1573 (timer_pending(&p->timer) ?
1574 time_after(p->timer.expires, time) :
1575 try_to_del_timer_sync(&p->timer) >= 0)) {
1576 mod_timer(&p->timer, time);
1577 }
1578
1579 break;
1580 }
1581 }
1582
1583 now = jiffies;
1584 time = now + br->multicast_last_member_count *
1585 br->multicast_last_member_interval;
1586
1587 if (!port) {
1588 if (mp->mglist &&
1589 (timer_pending(&mp->timer) ?
1590 time_after(mp->timer.expires, time) :
1591 try_to_del_timer_sync(&mp->timer) >= 0)) {
1592 mod_timer(&mp->timer, time);
1593 }
1594
1595 goto out;
1596 }
1597
1598 for (p = mlock_dereference(mp->ports, br);
1599 p != NULL;
1600 p = mlock_dereference(p->next, br)) {
1601 if (p->port != port)
1602 continue;
1603
1604 if (!hlist_unhashed(&p->mglist) &&
1605 (timer_pending(&p->timer) ?
1606 time_after(p->timer.expires, time) :
1607 try_to_del_timer_sync(&p->timer) >= 0)) {
1608 mod_timer(&p->timer, time);
1609 }
1610
1611 break;
1612 }
1613out:
1614 spin_unlock(&br->multicast_lock);
1615}
1616
1617static void br_ip4_multicast_leave_group(struct net_bridge *br,
1618 struct net_bridge_port *port,
1619 __be32 group,
1620 __u16 vid)
1621{
1622 struct br_ip br_group;
1623 struct bridge_mcast_own_query *own_query;
1624
1625 if (ipv4_is_local_multicast(group))
1626 return;
1627
1628 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1629
1630 br_group.u.ip4 = group;
1631 br_group.proto = htons(ETH_P_IP);
1632 br_group.vid = vid;
1633
1634 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1635 own_query);
1636}
1637
1638#if IS_ENABLED(CONFIG_IPV6)
1639static void br_ip6_multicast_leave_group(struct net_bridge *br,
1640 struct net_bridge_port *port,
1641 const struct in6_addr *group,
1642 __u16 vid)
1643{
1644 struct br_ip br_group;
1645 struct bridge_mcast_own_query *own_query;
1646
1647 if (ipv6_addr_is_ll_all_nodes(group))
1648 return;
1649
1650 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1651
1652 br_group.u.ip6 = *group;
1653 br_group.proto = htons(ETH_P_IPV6);
1654 br_group.vid = vid;
1655
1656 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1657 own_query);
1658}
1659#endif
1660
1661static void br_multicast_err_count(const struct net_bridge *br,
1662 const struct net_bridge_port *p,
1663 __be16 proto)
1664{
1665 struct bridge_mcast_stats __percpu *stats;
1666 struct bridge_mcast_stats *pstats;
1667
1668 if (!br->multicast_stats_enabled)
1669 return;
1670
1671 if (p)
1672 stats = p->mcast_stats;
1673 else
1674 stats = br->mcast_stats;
1675 if (WARN_ON(!stats))
1676 return;
1677
1678 pstats = this_cpu_ptr(stats);
1679
1680 u64_stats_update_begin(&pstats->syncp);
1681 switch (proto) {
1682 case htons(ETH_P_IP):
1683 pstats->mstats.igmp_parse_errors++;
1684 break;
1685#if IS_ENABLED(CONFIG_IPV6)
1686 case htons(ETH_P_IPV6):
1687 pstats->mstats.mld_parse_errors++;
1688 break;
1689#endif
1690 }
1691 u64_stats_update_end(&pstats->syncp);
1692}
1693
1694static void br_multicast_pim(struct net_bridge *br,
1695 struct net_bridge_port *port,
1696 const struct sk_buff *skb)
1697{
1698 unsigned int offset = skb_transport_offset(skb);
1699 struct pimhdr *pimhdr, _pimhdr;
1700
1701 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1702 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1703 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1704 return;
1705
1706 br_multicast_mark_router(br, port);
1707}
1708
1709static int br_multicast_ipv4_rcv(struct net_bridge *br,
1710 struct net_bridge_port *port,
1711 struct sk_buff *skb,
1712 u16 vid)
1713{
1714 struct sk_buff *skb_trimmed = NULL;
1715 struct igmphdr *ih;
1716 int err;
1717
1718 err = ip_mc_check_igmp(skb, &skb_trimmed);
1719
1720 if (err == -ENOMSG) {
1721 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1722 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1723 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1724 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1725 br_multicast_pim(br, port, skb);
1726 }
1727 return 0;
1728 } else if (err < 0) {
1729 br_multicast_err_count(br, port, skb->protocol);
1730 return err;
1731 }
1732
1733 ih = igmp_hdr(skb);
1734 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1735
1736 switch (ih->type) {
1737 case IGMP_HOST_MEMBERSHIP_REPORT:
1738 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1739 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1740 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1741 break;
1742 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1743 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1744 break;
1745 case IGMP_HOST_MEMBERSHIP_QUERY:
1746 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1747 break;
1748 case IGMP_HOST_LEAVE_MESSAGE:
1749 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1750 break;
1751 }
1752
1753 if (skb_trimmed && skb_trimmed != skb)
1754 kfree_skb(skb_trimmed);
1755
1756 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1757 BR_MCAST_DIR_RX);
1758
1759 return err;
1760}
1761
1762#if IS_ENABLED(CONFIG_IPV6)
1763static int br_multicast_ipv6_rcv(struct net_bridge *br,
1764 struct net_bridge_port *port,
1765 struct sk_buff *skb,
1766 u16 vid)
1767{
1768 struct sk_buff *skb_trimmed = NULL;
1769 struct mld_msg *mld;
1770 int err;
1771
1772 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1773
1774 if (err == -ENOMSG) {
1775 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1776 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1777 return 0;
1778 } else if (err < 0) {
1779 br_multicast_err_count(br, port, skb->protocol);
1780 return err;
1781 }
1782
1783 mld = (struct mld_msg *)skb_transport_header(skb);
1784 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1785
1786 switch (mld->mld_type) {
1787 case ICMPV6_MGM_REPORT:
1788 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1789 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1790 break;
1791 case ICMPV6_MLD2_REPORT:
1792 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1793 break;
1794 case ICMPV6_MGM_QUERY:
1795 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1796 break;
1797 case ICMPV6_MGM_REDUCTION:
1798 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1799 break;
1800 }
1801
1802 if (skb_trimmed && skb_trimmed != skb)
1803 kfree_skb(skb_trimmed);
1804
1805 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1806 BR_MCAST_DIR_RX);
1807
1808 return err;
1809}
1810#endif
1811
1812int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1813 struct sk_buff *skb, u16 vid)
1814{
1815 int ret = 0;
1816
1817 BR_INPUT_SKB_CB(skb)->igmp = 0;
1818 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1819
1820 if (br->multicast_disabled)
1821 return 0;
1822
1823 switch (skb->protocol) {
1824 case htons(ETH_P_IP):
1825 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1826 break;
1827#if IS_ENABLED(CONFIG_IPV6)
1828 case htons(ETH_P_IPV6):
1829 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1830 break;
1831#endif
1832 }
1833
1834 return ret;
1835}
1836
1837static void br_multicast_query_expired(struct net_bridge *br,
1838 struct bridge_mcast_own_query *query,
1839 struct bridge_mcast_querier *querier)
1840{
1841 spin_lock(&br->multicast_lock);
1842 if (query->startup_sent < br->multicast_startup_query_count)
1843 query->startup_sent++;
1844
1845 RCU_INIT_POINTER(querier->port, NULL);
1846 br_multicast_send_query(br, NULL, query);
1847 spin_unlock(&br->multicast_lock);
1848}
1849
1850static void br_ip4_multicast_query_expired(unsigned long data)
1851{
1852 struct net_bridge *br = (void *)data;
1853
1854 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1855}
1856
1857#if IS_ENABLED(CONFIG_IPV6)
1858static void br_ip6_multicast_query_expired(unsigned long data)
1859{
1860 struct net_bridge *br = (void *)data;
1861
1862 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1863}
1864#endif
1865
1866void br_multicast_init(struct net_bridge *br)
1867{
1868 br->hash_elasticity = 4;
1869 br->hash_max = 512;
1870
1871 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1872 br->multicast_querier = 0;
1873 br->multicast_query_use_ifaddr = 0;
1874 br->multicast_last_member_count = 2;
1875 br->multicast_startup_query_count = 2;
1876
1877 br->multicast_last_member_interval = HZ;
1878 br->multicast_query_response_interval = 10 * HZ;
1879 br->multicast_startup_query_interval = 125 * HZ / 4;
1880 br->multicast_query_interval = 125 * HZ;
1881 br->multicast_querier_interval = 255 * HZ;
1882 br->multicast_membership_interval = 260 * HZ;
1883
1884 br->ip4_other_query.delay_time = 0;
1885 br->ip4_querier.port = NULL;
1886 br->multicast_igmp_version = 2;
1887#if IS_ENABLED(CONFIG_IPV6)
1888 br->multicast_mld_version = 1;
1889 br->ip6_other_query.delay_time = 0;
1890 br->ip6_querier.port = NULL;
1891#endif
1892 br->has_ipv6_addr = 1;
1893
1894 spin_lock_init(&br->multicast_lock);
1895 setup_timer(&br->multicast_router_timer,
1896 br_multicast_local_router_expired, 0);
1897 setup_timer(&br->ip4_other_query.timer,
1898 br_ip4_multicast_querier_expired, (unsigned long)br);
1899 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1900 (unsigned long)br);
1901#if IS_ENABLED(CONFIG_IPV6)
1902 setup_timer(&br->ip6_other_query.timer,
1903 br_ip6_multicast_querier_expired, (unsigned long)br);
1904 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1905 (unsigned long)br);
1906#endif
1907}
1908
1909static void __br_multicast_open(struct net_bridge *br,
1910 struct bridge_mcast_own_query *query)
1911{
1912 query->startup_sent = 0;
1913
1914 if (br->multicast_disabled)
1915 return;
1916
1917 mod_timer(&query->timer, jiffies);
1918}
1919
1920void br_multicast_open(struct net_bridge *br)
1921{
1922 __br_multicast_open(br, &br->ip4_own_query);
1923#if IS_ENABLED(CONFIG_IPV6)
1924 __br_multicast_open(br, &br->ip6_own_query);
1925#endif
1926}
1927
1928void br_multicast_stop(struct net_bridge *br)
1929{
1930 del_timer_sync(&br->multicast_router_timer);
1931 del_timer_sync(&br->ip4_other_query.timer);
1932 del_timer_sync(&br->ip4_own_query.timer);
1933#if IS_ENABLED(CONFIG_IPV6)
1934 del_timer_sync(&br->ip6_other_query.timer);
1935 del_timer_sync(&br->ip6_own_query.timer);
1936#endif
1937}
1938
1939void br_multicast_dev_del(struct net_bridge *br)
1940{
1941 struct net_bridge_mdb_htable *mdb;
1942 struct net_bridge_mdb_entry *mp;
1943 struct hlist_node *n;
1944 u32 ver;
1945 int i;
1946
1947 spin_lock_bh(&br->multicast_lock);
1948 mdb = mlock_dereference(br->mdb, br);
1949 if (!mdb)
1950 goto out;
1951
1952 br->mdb = NULL;
1953
1954 ver = mdb->ver;
1955 for (i = 0; i < mdb->max; i++) {
1956 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1957 hlist[ver]) {
1958 del_timer(&mp->timer);
1959 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1960 }
1961 }
1962
1963 if (mdb->old) {
1964 spin_unlock_bh(&br->multicast_lock);
1965 rcu_barrier_bh();
1966 spin_lock_bh(&br->multicast_lock);
1967 WARN_ON(mdb->old);
1968 }
1969
1970 mdb->old = mdb;
1971 call_rcu_bh(&mdb->rcu, br_mdb_free);
1972
1973out:
1974 spin_unlock_bh(&br->multicast_lock);
1975
1976 free_percpu(br->mcast_stats);
1977}
1978
1979int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1980{
1981 int err = -EINVAL;
1982
1983 spin_lock_bh(&br->multicast_lock);
1984
1985 switch (val) {
1986 case MDB_RTR_TYPE_DISABLED:
1987 case MDB_RTR_TYPE_PERM:
1988 del_timer(&br->multicast_router_timer);
1989 /* fall through */
1990 case MDB_RTR_TYPE_TEMP_QUERY:
1991 br->multicast_router = val;
1992 err = 0;
1993 break;
1994 }
1995
1996 spin_unlock_bh(&br->multicast_lock);
1997
1998 return err;
1999}
2000
2001static void __del_port_router(struct net_bridge_port *p)
2002{
2003 if (hlist_unhashed(&p->rlist))
2004 return;
2005 hlist_del_init_rcu(&p->rlist);
2006 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2007}
2008
2009int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2010{
2011 struct net_bridge *br = p->br;
2012 unsigned long now = jiffies;
2013 int err = -EINVAL;
2014
2015 spin_lock(&br->multicast_lock);
2016 if (p->multicast_router == val) {
2017 /* Refresh the temp router port timer */
2018 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2019 mod_timer(&p->multicast_router_timer,
2020 now + br->multicast_querier_interval);
2021 err = 0;
2022 goto unlock;
2023 }
2024 switch (val) {
2025 case MDB_RTR_TYPE_DISABLED:
2026 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2027 __del_port_router(p);
2028 del_timer(&p->multicast_router_timer);
2029 break;
2030 case MDB_RTR_TYPE_TEMP_QUERY:
2031 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2032 __del_port_router(p);
2033 break;
2034 case MDB_RTR_TYPE_PERM:
2035 p->multicast_router = MDB_RTR_TYPE_PERM;
2036 del_timer(&p->multicast_router_timer);
2037 br_multicast_add_router(br, p);
2038 break;
2039 case MDB_RTR_TYPE_TEMP:
2040 p->multicast_router = MDB_RTR_TYPE_TEMP;
2041 br_multicast_mark_router(br, p);
2042 break;
2043 default:
2044 goto unlock;
2045 }
2046 err = 0;
2047unlock:
2048 spin_unlock(&br->multicast_lock);
2049
2050 return err;
2051}
2052
2053static void br_multicast_start_querier(struct net_bridge *br,
2054 struct bridge_mcast_own_query *query)
2055{
2056 struct net_bridge_port *port;
2057
2058 __br_multicast_open(br, query);
2059
2060 list_for_each_entry(port, &br->port_list, list) {
2061 if (port->state == BR_STATE_DISABLED ||
2062 port->state == BR_STATE_BLOCKING)
2063 continue;
2064
2065 if (query == &br->ip4_own_query)
2066 br_multicast_enable(&port->ip4_own_query);
2067#if IS_ENABLED(CONFIG_IPV6)
2068 else
2069 br_multicast_enable(&port->ip6_own_query);
2070#endif
2071 }
2072}
2073
2074int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2075{
2076 struct net_bridge_mdb_htable *mdb;
2077 struct net_bridge_port *port;
2078 int err = 0;
2079
2080 spin_lock_bh(&br->multicast_lock);
2081 if (br->multicast_disabled == !val)
2082 goto unlock;
2083
2084 br->multicast_disabled = !val;
2085 if (br->multicast_disabled)
2086 goto unlock;
2087
2088 if (!netif_running(br->dev))
2089 goto unlock;
2090
2091 mdb = mlock_dereference(br->mdb, br);
2092 if (mdb) {
2093 if (mdb->old) {
2094 err = -EEXIST;
2095rollback:
2096 br->multicast_disabled = !!val;
2097 goto unlock;
2098 }
2099
2100 err = br_mdb_rehash(&br->mdb, mdb->max,
2101 br->hash_elasticity);
2102 if (err)
2103 goto rollback;
2104 }
2105
2106 br_multicast_open(br);
2107 list_for_each_entry(port, &br->port_list, list)
2108 __br_multicast_enable_port(port);
2109
2110unlock:
2111 spin_unlock_bh(&br->multicast_lock);
2112
2113 return err;
2114}
2115
2116int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2117{
2118 unsigned long max_delay;
2119
2120 val = !!val;
2121
2122 spin_lock_bh(&br->multicast_lock);
2123 if (br->multicast_querier == val)
2124 goto unlock;
2125
2126 br->multicast_querier = val;
2127 if (!val)
2128 goto unlock;
2129
2130 max_delay = br->multicast_query_response_interval;
2131
2132 if (!timer_pending(&br->ip4_other_query.timer))
2133 br->ip4_other_query.delay_time = jiffies + max_delay;
2134
2135 br_multicast_start_querier(br, &br->ip4_own_query);
2136
2137#if IS_ENABLED(CONFIG_IPV6)
2138 if (!timer_pending(&br->ip6_other_query.timer))
2139 br->ip6_other_query.delay_time = jiffies + max_delay;
2140
2141 br_multicast_start_querier(br, &br->ip6_own_query);
2142#endif
2143
2144unlock:
2145 spin_unlock_bh(&br->multicast_lock);
2146
2147 return 0;
2148}
2149
2150int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2151{
2152 int err = -EINVAL;
2153 u32 old;
2154 struct net_bridge_mdb_htable *mdb;
2155
2156 spin_lock_bh(&br->multicast_lock);
2157 if (!is_power_of_2(val))
2158 goto unlock;
2159
2160 mdb = mlock_dereference(br->mdb, br);
2161 if (mdb && val < mdb->size)
2162 goto unlock;
2163
2164 err = 0;
2165
2166 old = br->hash_max;
2167 br->hash_max = val;
2168
2169 if (mdb) {
2170 if (mdb->old) {
2171 err = -EEXIST;
2172rollback:
2173 br->hash_max = old;
2174 goto unlock;
2175 }
2176
2177 err = br_mdb_rehash(&br->mdb, br->hash_max,
2178 br->hash_elasticity);
2179 if (err)
2180 goto rollback;
2181 }
2182
2183unlock:
2184 spin_unlock_bh(&br->multicast_lock);
2185
2186 return err;
2187}
2188
2189int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2190{
2191 /* Currently we support only version 2 and 3 */
2192 switch (val) {
2193 case 2:
2194 case 3:
2195 break;
2196 default:
2197 return -EINVAL;
2198 }
2199
2200 spin_lock_bh(&br->multicast_lock);
2201 br->multicast_igmp_version = val;
2202 spin_unlock_bh(&br->multicast_lock);
2203
2204 return 0;
2205}
2206
2207#if IS_ENABLED(CONFIG_IPV6)
2208int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2209{
2210 /* Currently we support version 1 and 2 */
2211 switch (val) {
2212 case 1:
2213 case 2:
2214 break;
2215 default:
2216 return -EINVAL;
2217 }
2218
2219 spin_lock_bh(&br->multicast_lock);
2220 br->multicast_mld_version = val;
2221 spin_unlock_bh(&br->multicast_lock);
2222
2223 return 0;
2224}
2225#endif
2226
2227/**
2228 * br_multicast_list_adjacent - Returns snooped multicast addresses
2229 * @dev: The bridge port adjacent to which to retrieve addresses
2230 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2231 *
2232 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2233 * snooping feature on all bridge ports of dev's bridge device, excluding
2234 * the addresses from dev itself.
2235 *
2236 * Returns the number of items added to br_ip_list.
2237 *
2238 * Notes:
2239 * - br_ip_list needs to be initialized by caller
2240 * - br_ip_list might contain duplicates in the end
2241 * (needs to be taken care of by caller)
2242 * - br_ip_list needs to be freed by caller
2243 */
2244int br_multicast_list_adjacent(struct net_device *dev,
2245 struct list_head *br_ip_list)
2246{
2247 struct net_bridge *br;
2248 struct net_bridge_port *port;
2249 struct net_bridge_port_group *group;
2250 struct br_ip_list *entry;
2251 int count = 0;
2252
2253 rcu_read_lock();
2254 if (!br_ip_list || !br_port_exists(dev))
2255 goto unlock;
2256
2257 port = br_port_get_rcu(dev);
2258 if (!port || !port->br)
2259 goto unlock;
2260
2261 br = port->br;
2262
2263 list_for_each_entry_rcu(port, &br->port_list, list) {
2264 if (!port->dev || port->dev == dev)
2265 continue;
2266
2267 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2268 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2269 if (!entry)
2270 goto unlock;
2271
2272 entry->addr = group->addr;
2273 list_add(&entry->list, br_ip_list);
2274 count++;
2275 }
2276 }
2277
2278unlock:
2279 rcu_read_unlock();
2280 return count;
2281}
2282EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2283
2284/**
2285 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2286 * @dev: The bridge port providing the bridge on which to check for a querier
2287 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2288 *
2289 * Checks whether the given interface has a bridge on top and if so returns
2290 * true if a valid querier exists anywhere on the bridged link layer.
2291 * Otherwise returns false.
2292 */
2293bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2294{
2295 struct net_bridge *br;
2296 struct net_bridge_port *port;
2297 struct ethhdr eth;
2298 bool ret = false;
2299
2300 rcu_read_lock();
2301 if (!br_port_exists(dev))
2302 goto unlock;
2303
2304 port = br_port_get_rcu(dev);
2305 if (!port || !port->br)
2306 goto unlock;
2307
2308 br = port->br;
2309
2310 memset(ð, 0, sizeof(eth));
2311 eth.h_proto = htons(proto);
2312
2313 ret = br_multicast_querier_exists(br, ð);
2314
2315unlock:
2316 rcu_read_unlock();
2317 return ret;
2318}
2319EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2320
2321/**
2322 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2323 * @dev: The bridge port adjacent to which to check for a querier
2324 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2325 *
2326 * Checks whether the given interface has a bridge on top and if so returns
2327 * true if a selected querier is behind one of the other ports of this
2328 * bridge. Otherwise returns false.
2329 */
2330bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2331{
2332 struct net_bridge *br;
2333 struct net_bridge_port *port;
2334 bool ret = false;
2335
2336 rcu_read_lock();
2337 if (!br_port_exists(dev))
2338 goto unlock;
2339
2340 port = br_port_get_rcu(dev);
2341 if (!port || !port->br)
2342 goto unlock;
2343
2344 br = port->br;
2345
2346 switch (proto) {
2347 case ETH_P_IP:
2348 if (!timer_pending(&br->ip4_other_query.timer) ||
2349 rcu_dereference(br->ip4_querier.port) == port)
2350 goto unlock;
2351 break;
2352#if IS_ENABLED(CONFIG_IPV6)
2353 case ETH_P_IPV6:
2354 if (!timer_pending(&br->ip6_other_query.timer) ||
2355 rcu_dereference(br->ip6_querier.port) == port)
2356 goto unlock;
2357 break;
2358#endif
2359 default:
2360 goto unlock;
2361 }
2362
2363 ret = true;
2364unlock:
2365 rcu_read_unlock();
2366 return ret;
2367}
2368EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2369
2370static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2371 const struct sk_buff *skb, u8 type, u8 dir)
2372{
2373 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2374 __be16 proto = skb->protocol;
2375 unsigned int t_len;
2376
2377 u64_stats_update_begin(&pstats->syncp);
2378 switch (proto) {
2379 case htons(ETH_P_IP):
2380 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2381 switch (type) {
2382 case IGMP_HOST_MEMBERSHIP_REPORT:
2383 pstats->mstats.igmp_v1reports[dir]++;
2384 break;
2385 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2386 pstats->mstats.igmp_v2reports[dir]++;
2387 break;
2388 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2389 pstats->mstats.igmp_v3reports[dir]++;
2390 break;
2391 case IGMP_HOST_MEMBERSHIP_QUERY:
2392 if (t_len != sizeof(struct igmphdr)) {
2393 pstats->mstats.igmp_v3queries[dir]++;
2394 } else {
2395 unsigned int offset = skb_transport_offset(skb);
2396 struct igmphdr *ih, _ihdr;
2397
2398 ih = skb_header_pointer(skb, offset,
2399 sizeof(_ihdr), &_ihdr);
2400 if (!ih)
2401 break;
2402 if (!ih->code)
2403 pstats->mstats.igmp_v1queries[dir]++;
2404 else
2405 pstats->mstats.igmp_v2queries[dir]++;
2406 }
2407 break;
2408 case IGMP_HOST_LEAVE_MESSAGE:
2409 pstats->mstats.igmp_leaves[dir]++;
2410 break;
2411 }
2412 break;
2413#if IS_ENABLED(CONFIG_IPV6)
2414 case htons(ETH_P_IPV6):
2415 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2416 sizeof(struct ipv6hdr);
2417 t_len -= skb_network_header_len(skb);
2418 switch (type) {
2419 case ICMPV6_MGM_REPORT:
2420 pstats->mstats.mld_v1reports[dir]++;
2421 break;
2422 case ICMPV6_MLD2_REPORT:
2423 pstats->mstats.mld_v2reports[dir]++;
2424 break;
2425 case ICMPV6_MGM_QUERY:
2426 if (t_len != sizeof(struct mld_msg))
2427 pstats->mstats.mld_v2queries[dir]++;
2428 else
2429 pstats->mstats.mld_v1queries[dir]++;
2430 break;
2431 case ICMPV6_MGM_REDUCTION:
2432 pstats->mstats.mld_leaves[dir]++;
2433 break;
2434 }
2435 break;
2436#endif /* CONFIG_IPV6 */
2437 }
2438 u64_stats_update_end(&pstats->syncp);
2439}
2440
2441void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2442 const struct sk_buff *skb, u8 type, u8 dir)
2443{
2444 struct bridge_mcast_stats __percpu *stats;
2445
2446 /* if multicast_disabled is true then igmp type can't be set */
2447 if (!type || !br->multicast_stats_enabled)
2448 return;
2449
2450 if (p)
2451 stats = p->mcast_stats;
2452 else
2453 stats = br->mcast_stats;
2454 if (WARN_ON(!stats))
2455 return;
2456
2457 br_mcast_stats_add(stats, skb, type, dir);
2458}
2459
2460int br_multicast_init_stats(struct net_bridge *br)
2461{
2462 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2463 if (!br->mcast_stats)
2464 return -ENOMEM;
2465
2466 return 0;
2467}
2468
2469static void mcast_stats_add_dir(u64 *dst, u64 *src)
2470{
2471 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2472 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2473}
2474
2475void br_multicast_get_stats(const struct net_bridge *br,
2476 const struct net_bridge_port *p,
2477 struct br_mcast_stats *dest)
2478{
2479 struct bridge_mcast_stats __percpu *stats;
2480 struct br_mcast_stats tdst;
2481 int i;
2482
2483 memset(dest, 0, sizeof(*dest));
2484 if (p)
2485 stats = p->mcast_stats;
2486 else
2487 stats = br->mcast_stats;
2488 if (WARN_ON(!stats))
2489 return;
2490
2491 memset(&tdst, 0, sizeof(tdst));
2492 for_each_possible_cpu(i) {
2493 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2494 struct br_mcast_stats temp;
2495 unsigned int start;
2496
2497 do {
2498 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2499 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2500 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2501
2502 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2503 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2504 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2505 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2506 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2507 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2508 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2509 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2510
2511 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2512 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2513 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2514 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2515 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2516 tdst.mld_parse_errors += temp.mld_parse_errors;
2517 }
2518 memcpy(dest, &tdst, sizeof(*dest));
2519}