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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#include <net/switchdev.h>
31#if IS_ENABLED(CONFIG_IPV6)
32#include <net/ipv6.h>
33#include <net/mld.h>
34#include <net/ip6_checksum.h>
35#include <net/addrconf.h>
36#endif
37
38#include "br_private.h"
39
40static void br_multicast_start_querier(struct net_bridge *br,
41 struct bridge_mcast_own_query *query);
42static void br_multicast_add_router(struct net_bridge *br,
43 struct net_bridge_port *port);
44static void br_ip4_multicast_leave_group(struct net_bridge *br,
45 struct net_bridge_port *port,
46 __be32 group,
47 __u16 vid,
48 const unsigned char *src);
49
50static void __del_port_router(struct net_bridge_port *p);
51#if IS_ENABLED(CONFIG_IPV6)
52static void br_ip6_multicast_leave_group(struct net_bridge *br,
53 struct net_bridge_port *port,
54 const struct in6_addr *group,
55 __u16 vid, const unsigned char *src);
56#endif
57unsigned int br_mdb_rehash_seq;
58
59static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
60{
61 if (a->proto != b->proto)
62 return 0;
63 if (a->vid != b->vid)
64 return 0;
65 switch (a->proto) {
66 case htons(ETH_P_IP):
67 return a->u.ip4 == b->u.ip4;
68#if IS_ENABLED(CONFIG_IPV6)
69 case htons(ETH_P_IPV6):
70 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
71#endif
72 }
73 return 0;
74}
75
76static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
77 __u16 vid)
78{
79 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
80}
81
82#if IS_ENABLED(CONFIG_IPV6)
83static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
84 const struct in6_addr *ip,
85 __u16 vid)
86{
87 return jhash_2words(ipv6_addr_hash(ip), vid,
88 mdb->secret) & (mdb->max - 1);
89}
90#endif
91
92static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
93 struct br_ip *ip)
94{
95 switch (ip->proto) {
96 case htons(ETH_P_IP):
97 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
98#if IS_ENABLED(CONFIG_IPV6)
99 case htons(ETH_P_IPV6):
100 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
101#endif
102 }
103 return 0;
104}
105
106static struct net_bridge_mdb_entry *__br_mdb_ip_get(
107 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
108{
109 struct net_bridge_mdb_entry *mp;
110
111 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
112 if (br_ip_equal(&mp->addr, dst))
113 return mp;
114 }
115
116 return NULL;
117}
118
119struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
120 struct br_ip *dst)
121{
122 if (!mdb)
123 return NULL;
124
125 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
126}
127
128static struct net_bridge_mdb_entry *br_mdb_ip4_get(
129 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
130{
131 struct br_ip br_dst;
132
133 br_dst.u.ip4 = dst;
134 br_dst.proto = htons(ETH_P_IP);
135 br_dst.vid = vid;
136
137 return br_mdb_ip_get(mdb, &br_dst);
138}
139
140#if IS_ENABLED(CONFIG_IPV6)
141static struct net_bridge_mdb_entry *br_mdb_ip6_get(
142 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
143 __u16 vid)
144{
145 struct br_ip br_dst;
146
147 br_dst.u.ip6 = *dst;
148 br_dst.proto = htons(ETH_P_IPV6);
149 br_dst.vid = vid;
150
151 return br_mdb_ip_get(mdb, &br_dst);
152}
153#endif
154
155struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
156 struct sk_buff *skb, u16 vid)
157{
158 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
159 struct br_ip ip;
160
161 if (br->multicast_disabled)
162 return NULL;
163
164 if (BR_INPUT_SKB_CB(skb)->igmp)
165 return NULL;
166
167 ip.proto = skb->protocol;
168 ip.vid = vid;
169
170 switch (skb->protocol) {
171 case htons(ETH_P_IP):
172 ip.u.ip4 = ip_hdr(skb)->daddr;
173 break;
174#if IS_ENABLED(CONFIG_IPV6)
175 case htons(ETH_P_IPV6):
176 ip.u.ip6 = ipv6_hdr(skb)->daddr;
177 break;
178#endif
179 default:
180 return NULL;
181 }
182
183 return br_mdb_ip_get(mdb, &ip);
184}
185
186static void br_mdb_free(struct rcu_head *head)
187{
188 struct net_bridge_mdb_htable *mdb =
189 container_of(head, struct net_bridge_mdb_htable, rcu);
190 struct net_bridge_mdb_htable *old = mdb->old;
191
192 mdb->old = NULL;
193 kfree(old->mhash);
194 kfree(old);
195}
196
197static int br_mdb_copy(struct net_bridge_mdb_htable *new,
198 struct net_bridge_mdb_htable *old,
199 int elasticity)
200{
201 struct net_bridge_mdb_entry *mp;
202 int maxlen;
203 int len;
204 int i;
205
206 for (i = 0; i < old->max; i++)
207 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
208 hlist_add_head(&mp->hlist[new->ver],
209 &new->mhash[br_ip_hash(new, &mp->addr)]);
210
211 if (!elasticity)
212 return 0;
213
214 maxlen = 0;
215 for (i = 0; i < new->max; i++) {
216 len = 0;
217 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
218 len++;
219 if (len > maxlen)
220 maxlen = len;
221 }
222
223 return maxlen > elasticity ? -EINVAL : 0;
224}
225
226void br_multicast_free_pg(struct rcu_head *head)
227{
228 struct net_bridge_port_group *p =
229 container_of(head, struct net_bridge_port_group, rcu);
230
231 kfree(p);
232}
233
234static void br_multicast_free_group(struct rcu_head *head)
235{
236 struct net_bridge_mdb_entry *mp =
237 container_of(head, struct net_bridge_mdb_entry, rcu);
238
239 kfree(mp);
240}
241
242static void br_multicast_group_expired(struct timer_list *t)
243{
244 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
245 struct net_bridge *br = mp->br;
246 struct net_bridge_mdb_htable *mdb;
247
248 spin_lock(&br->multicast_lock);
249 if (!netif_running(br->dev) || timer_pending(&mp->timer))
250 goto out;
251
252 mp->host_joined = false;
253 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
254
255 if (mp->ports)
256 goto out;
257
258 mdb = mlock_dereference(br->mdb, br);
259
260 hlist_del_rcu(&mp->hlist[mdb->ver]);
261 mdb->size--;
262
263 call_rcu_bh(&mp->rcu, br_multicast_free_group);
264
265out:
266 spin_unlock(&br->multicast_lock);
267}
268
269static void br_multicast_del_pg(struct net_bridge *br,
270 struct net_bridge_port_group *pg)
271{
272 struct net_bridge_mdb_htable *mdb;
273 struct net_bridge_mdb_entry *mp;
274 struct net_bridge_port_group *p;
275 struct net_bridge_port_group __rcu **pp;
276
277 mdb = mlock_dereference(br->mdb, br);
278
279 mp = br_mdb_ip_get(mdb, &pg->addr);
280 if (WARN_ON(!mp))
281 return;
282
283 for (pp = &mp->ports;
284 (p = mlock_dereference(*pp, br)) != NULL;
285 pp = &p->next) {
286 if (p != pg)
287 continue;
288
289 rcu_assign_pointer(*pp, p->next);
290 hlist_del_init(&p->mglist);
291 del_timer(&p->timer);
292 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
293 p->flags);
294 call_rcu_bh(&p->rcu, br_multicast_free_pg);
295
296 if (!mp->ports && !mp->host_joined &&
297 netif_running(br->dev))
298 mod_timer(&mp->timer, jiffies);
299
300 return;
301 }
302
303 WARN_ON(1);
304}
305
306static void br_multicast_port_group_expired(struct timer_list *t)
307{
308 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
309 struct net_bridge *br = pg->port->br;
310
311 spin_lock(&br->multicast_lock);
312 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
313 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
314 goto out;
315
316 br_multicast_del_pg(br, pg);
317
318out:
319 spin_unlock(&br->multicast_lock);
320}
321
322static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
323 int elasticity)
324{
325 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
326 struct net_bridge_mdb_htable *mdb;
327 int err;
328
329 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
330 if (!mdb)
331 return -ENOMEM;
332
333 mdb->max = max;
334 mdb->old = old;
335
336 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
337 if (!mdb->mhash) {
338 kfree(mdb);
339 return -ENOMEM;
340 }
341
342 mdb->size = old ? old->size : 0;
343 mdb->ver = old ? old->ver ^ 1 : 0;
344
345 if (!old || elasticity)
346 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
347 else
348 mdb->secret = old->secret;
349
350 if (!old)
351 goto out;
352
353 err = br_mdb_copy(mdb, old, elasticity);
354 if (err) {
355 kfree(mdb->mhash);
356 kfree(mdb);
357 return err;
358 }
359
360 br_mdb_rehash_seq++;
361 call_rcu_bh(&mdb->rcu, br_mdb_free);
362
363out:
364 rcu_assign_pointer(*mdbp, mdb);
365
366 return 0;
367}
368
369static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
370 __be32 group,
371 u8 *igmp_type)
372{
373 struct igmpv3_query *ihv3;
374 size_t igmp_hdr_size;
375 struct sk_buff *skb;
376 struct igmphdr *ih;
377 struct ethhdr *eth;
378 struct iphdr *iph;
379
380 igmp_hdr_size = sizeof(*ih);
381 if (br->multicast_igmp_version == 3)
382 igmp_hdr_size = sizeof(*ihv3);
383 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
384 igmp_hdr_size + 4);
385 if (!skb)
386 goto out;
387
388 skb->protocol = htons(ETH_P_IP);
389
390 skb_reset_mac_header(skb);
391 eth = eth_hdr(skb);
392
393 ether_addr_copy(eth->h_source, br->dev->dev_addr);
394 eth->h_dest[0] = 1;
395 eth->h_dest[1] = 0;
396 eth->h_dest[2] = 0x5e;
397 eth->h_dest[3] = 0;
398 eth->h_dest[4] = 0;
399 eth->h_dest[5] = 1;
400 eth->h_proto = htons(ETH_P_IP);
401 skb_put(skb, sizeof(*eth));
402
403 skb_set_network_header(skb, skb->len);
404 iph = ip_hdr(skb);
405
406 iph->version = 4;
407 iph->ihl = 6;
408 iph->tos = 0xc0;
409 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
410 iph->id = 0;
411 iph->frag_off = htons(IP_DF);
412 iph->ttl = 1;
413 iph->protocol = IPPROTO_IGMP;
414 iph->saddr = br->multicast_query_use_ifaddr ?
415 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
416 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
417 ((u8 *)&iph[1])[0] = IPOPT_RA;
418 ((u8 *)&iph[1])[1] = 4;
419 ((u8 *)&iph[1])[2] = 0;
420 ((u8 *)&iph[1])[3] = 0;
421 ip_send_check(iph);
422 skb_put(skb, 24);
423
424 skb_set_transport_header(skb, skb->len);
425 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
426
427 switch (br->multicast_igmp_version) {
428 case 2:
429 ih = igmp_hdr(skb);
430 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
431 ih->code = (group ? br->multicast_last_member_interval :
432 br->multicast_query_response_interval) /
433 (HZ / IGMP_TIMER_SCALE);
434 ih->group = group;
435 ih->csum = 0;
436 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
437 break;
438 case 3:
439 ihv3 = igmpv3_query_hdr(skb);
440 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
441 ihv3->code = (group ? br->multicast_last_member_interval :
442 br->multicast_query_response_interval) /
443 (HZ / IGMP_TIMER_SCALE);
444 ihv3->group = group;
445 ihv3->qqic = br->multicast_query_interval / HZ;
446 ihv3->nsrcs = 0;
447 ihv3->resv = 0;
448 ihv3->suppress = 0;
449 ihv3->qrv = 2;
450 ihv3->csum = 0;
451 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
452 break;
453 }
454
455 skb_put(skb, igmp_hdr_size);
456 __skb_pull(skb, sizeof(*eth));
457
458out:
459 return skb;
460}
461
462#if IS_ENABLED(CONFIG_IPV6)
463static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
464 const struct in6_addr *grp,
465 u8 *igmp_type)
466{
467 struct mld2_query *mld2q;
468 unsigned long interval;
469 struct ipv6hdr *ip6h;
470 struct mld_msg *mldq;
471 size_t mld_hdr_size;
472 struct sk_buff *skb;
473 struct ethhdr *eth;
474 u8 *hopopt;
475
476 mld_hdr_size = sizeof(*mldq);
477 if (br->multicast_mld_version == 2)
478 mld_hdr_size = sizeof(*mld2q);
479 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
480 8 + mld_hdr_size);
481 if (!skb)
482 goto out;
483
484 skb->protocol = htons(ETH_P_IPV6);
485
486 /* Ethernet header */
487 skb_reset_mac_header(skb);
488 eth = eth_hdr(skb);
489
490 ether_addr_copy(eth->h_source, br->dev->dev_addr);
491 eth->h_proto = htons(ETH_P_IPV6);
492 skb_put(skb, sizeof(*eth));
493
494 /* IPv6 header + HbH option */
495 skb_set_network_header(skb, skb->len);
496 ip6h = ipv6_hdr(skb);
497
498 *(__force __be32 *)ip6h = htonl(0x60000000);
499 ip6h->payload_len = htons(8 + mld_hdr_size);
500 ip6h->nexthdr = IPPROTO_HOPOPTS;
501 ip6h->hop_limit = 1;
502 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
503 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
504 &ip6h->saddr)) {
505 kfree_skb(skb);
506 br->has_ipv6_addr = 0;
507 return NULL;
508 }
509
510 br->has_ipv6_addr = 1;
511 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
512
513 hopopt = (u8 *)(ip6h + 1);
514 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
515 hopopt[1] = 0; /* length of HbH */
516 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
517 hopopt[3] = 2; /* Length of RA Option */
518 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
519 hopopt[5] = 0;
520 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
521 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
522
523 skb_put(skb, sizeof(*ip6h) + 8);
524
525 /* ICMPv6 */
526 skb_set_transport_header(skb, skb->len);
527 interval = ipv6_addr_any(grp) ?
528 br->multicast_query_response_interval :
529 br->multicast_last_member_interval;
530 *igmp_type = ICMPV6_MGM_QUERY;
531 switch (br->multicast_mld_version) {
532 case 1:
533 mldq = (struct mld_msg *)icmp6_hdr(skb);
534 mldq->mld_type = ICMPV6_MGM_QUERY;
535 mldq->mld_code = 0;
536 mldq->mld_cksum = 0;
537 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
538 mldq->mld_reserved = 0;
539 mldq->mld_mca = *grp;
540 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
541 sizeof(*mldq), IPPROTO_ICMPV6,
542 csum_partial(mldq,
543 sizeof(*mldq),
544 0));
545 break;
546 case 2:
547 mld2q = (struct mld2_query *)icmp6_hdr(skb);
548 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
549 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
550 mld2q->mld2q_code = 0;
551 mld2q->mld2q_cksum = 0;
552 mld2q->mld2q_resv1 = 0;
553 mld2q->mld2q_resv2 = 0;
554 mld2q->mld2q_suppress = 0;
555 mld2q->mld2q_qrv = 2;
556 mld2q->mld2q_nsrcs = 0;
557 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
558 mld2q->mld2q_mca = *grp;
559 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
560 sizeof(*mld2q),
561 IPPROTO_ICMPV6,
562 csum_partial(mld2q,
563 sizeof(*mld2q),
564 0));
565 break;
566 }
567 skb_put(skb, mld_hdr_size);
568
569 __skb_pull(skb, sizeof(*eth));
570
571out:
572 return skb;
573}
574#endif
575
576static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
577 struct br_ip *addr,
578 u8 *igmp_type)
579{
580 switch (addr->proto) {
581 case htons(ETH_P_IP):
582 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
583#if IS_ENABLED(CONFIG_IPV6)
584 case htons(ETH_P_IPV6):
585 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
586 igmp_type);
587#endif
588 }
589 return NULL;
590}
591
592static struct net_bridge_mdb_entry *br_multicast_get_group(
593 struct net_bridge *br, struct net_bridge_port *port,
594 struct br_ip *group, int hash)
595{
596 struct net_bridge_mdb_htable *mdb;
597 struct net_bridge_mdb_entry *mp;
598 unsigned int count = 0;
599 unsigned int max;
600 int elasticity;
601 int err;
602
603 mdb = rcu_dereference_protected(br->mdb, 1);
604 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
605 count++;
606 if (unlikely(br_ip_equal(group, &mp->addr)))
607 return mp;
608 }
609
610 elasticity = 0;
611 max = mdb->max;
612
613 if (unlikely(count > br->hash_elasticity && count)) {
614 if (net_ratelimit())
615 br_info(br, "Multicast hash table "
616 "chain limit reached: %s\n",
617 port ? port->dev->name : br->dev->name);
618
619 elasticity = br->hash_elasticity;
620 }
621
622 if (mdb->size >= max) {
623 max *= 2;
624 if (unlikely(max > br->hash_max)) {
625 br_warn(br, "Multicast hash table maximum of %d "
626 "reached, disabling snooping: %s\n",
627 br->hash_max,
628 port ? port->dev->name : br->dev->name);
629 err = -E2BIG;
630disable:
631 br->multicast_disabled = 1;
632 goto err;
633 }
634 }
635
636 if (max > mdb->max || elasticity) {
637 if (mdb->old) {
638 if (net_ratelimit())
639 br_info(br, "Multicast hash table "
640 "on fire: %s\n",
641 port ? port->dev->name : br->dev->name);
642 err = -EEXIST;
643 goto err;
644 }
645
646 err = br_mdb_rehash(&br->mdb, max, elasticity);
647 if (err) {
648 br_warn(br, "Cannot rehash multicast "
649 "hash table, disabling snooping: %s, %d, %d\n",
650 port ? port->dev->name : br->dev->name,
651 mdb->size, err);
652 goto disable;
653 }
654
655 err = -EAGAIN;
656 goto err;
657 }
658
659 return NULL;
660
661err:
662 mp = ERR_PTR(err);
663 return mp;
664}
665
666struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
667 struct net_bridge_port *p,
668 struct br_ip *group)
669{
670 struct net_bridge_mdb_htable *mdb;
671 struct net_bridge_mdb_entry *mp;
672 int hash;
673 int err;
674
675 mdb = rcu_dereference_protected(br->mdb, 1);
676 if (!mdb) {
677 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
678 if (err)
679 return ERR_PTR(err);
680 goto rehash;
681 }
682
683 hash = br_ip_hash(mdb, group);
684 mp = br_multicast_get_group(br, p, group, hash);
685 switch (PTR_ERR(mp)) {
686 case 0:
687 break;
688
689 case -EAGAIN:
690rehash:
691 mdb = rcu_dereference_protected(br->mdb, 1);
692 hash = br_ip_hash(mdb, group);
693 break;
694
695 default:
696 goto out;
697 }
698
699 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
700 if (unlikely(!mp))
701 return ERR_PTR(-ENOMEM);
702
703 mp->br = br;
704 mp->addr = *group;
705 timer_setup(&mp->timer, br_multicast_group_expired, 0);
706
707 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
708 mdb->size++;
709
710out:
711 return mp;
712}
713
714struct net_bridge_port_group *br_multicast_new_port_group(
715 struct net_bridge_port *port,
716 struct br_ip *group,
717 struct net_bridge_port_group __rcu *next,
718 unsigned char flags,
719 const unsigned char *src)
720{
721 struct net_bridge_port_group *p;
722
723 p = kzalloc(sizeof(*p), GFP_ATOMIC);
724 if (unlikely(!p))
725 return NULL;
726
727 p->addr = *group;
728 p->port = port;
729 p->flags = flags;
730 rcu_assign_pointer(p->next, next);
731 hlist_add_head(&p->mglist, &port->mglist);
732 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
733
734 if (src)
735 memcpy(p->eth_addr, src, ETH_ALEN);
736 else
737 memset(p->eth_addr, 0xff, ETH_ALEN);
738
739 return p;
740}
741
742static bool br_port_group_equal(struct net_bridge_port_group *p,
743 struct net_bridge_port *port,
744 const unsigned char *src)
745{
746 if (p->port != port)
747 return false;
748
749 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
750 return true;
751
752 return ether_addr_equal(src, p->eth_addr);
753}
754
755static int br_multicast_add_group(struct net_bridge *br,
756 struct net_bridge_port *port,
757 struct br_ip *group,
758 const unsigned char *src)
759{
760 struct net_bridge_port_group __rcu **pp;
761 struct net_bridge_port_group *p;
762 struct net_bridge_mdb_entry *mp;
763 unsigned long now = jiffies;
764 int err;
765
766 spin_lock(&br->multicast_lock);
767 if (!netif_running(br->dev) ||
768 (port && port->state == BR_STATE_DISABLED))
769 goto out;
770
771 mp = br_multicast_new_group(br, port, group);
772 err = PTR_ERR(mp);
773 if (IS_ERR(mp))
774 goto err;
775
776 if (!port) {
777 if (!mp->host_joined) {
778 mp->host_joined = true;
779 br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
780 }
781 mod_timer(&mp->timer, now + br->multicast_membership_interval);
782 goto out;
783 }
784
785 for (pp = &mp->ports;
786 (p = mlock_dereference(*pp, br)) != NULL;
787 pp = &p->next) {
788 if (br_port_group_equal(p, port, src))
789 goto found;
790 if ((unsigned long)p->port < (unsigned long)port)
791 break;
792 }
793
794 p = br_multicast_new_port_group(port, group, *pp, 0, src);
795 if (unlikely(!p))
796 goto err;
797 rcu_assign_pointer(*pp, p);
798 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
799
800found:
801 mod_timer(&p->timer, now + br->multicast_membership_interval);
802out:
803 err = 0;
804
805err:
806 spin_unlock(&br->multicast_lock);
807 return err;
808}
809
810static int br_ip4_multicast_add_group(struct net_bridge *br,
811 struct net_bridge_port *port,
812 __be32 group,
813 __u16 vid,
814 const unsigned char *src)
815{
816 struct br_ip br_group;
817
818 if (ipv4_is_local_multicast(group))
819 return 0;
820
821 br_group.u.ip4 = group;
822 br_group.proto = htons(ETH_P_IP);
823 br_group.vid = vid;
824
825 return br_multicast_add_group(br, port, &br_group, src);
826}
827
828#if IS_ENABLED(CONFIG_IPV6)
829static int br_ip6_multicast_add_group(struct net_bridge *br,
830 struct net_bridge_port *port,
831 const struct in6_addr *group,
832 __u16 vid,
833 const unsigned char *src)
834{
835 struct br_ip br_group;
836
837 if (ipv6_addr_is_ll_all_nodes(group))
838 return 0;
839
840 br_group.u.ip6 = *group;
841 br_group.proto = htons(ETH_P_IPV6);
842 br_group.vid = vid;
843
844 return br_multicast_add_group(br, port, &br_group, src);
845}
846#endif
847
848static void br_multicast_router_expired(struct timer_list *t)
849{
850 struct net_bridge_port *port =
851 from_timer(port, t, multicast_router_timer);
852 struct net_bridge *br = port->br;
853
854 spin_lock(&br->multicast_lock);
855 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
856 port->multicast_router == MDB_RTR_TYPE_PERM ||
857 timer_pending(&port->multicast_router_timer))
858 goto out;
859
860 __del_port_router(port);
861out:
862 spin_unlock(&br->multicast_lock);
863}
864
865static void br_mc_router_state_change(struct net_bridge *p,
866 bool is_mc_router)
867{
868 struct switchdev_attr attr = {
869 .orig_dev = p->dev,
870 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
871 .flags = SWITCHDEV_F_DEFER,
872 .u.mrouter = is_mc_router,
873 };
874
875 switchdev_port_attr_set(p->dev, &attr);
876}
877
878static void br_multicast_local_router_expired(struct timer_list *t)
879{
880 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
881
882 spin_lock(&br->multicast_lock);
883 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
884 br->multicast_router == MDB_RTR_TYPE_PERM ||
885 timer_pending(&br->multicast_router_timer))
886 goto out;
887
888 br_mc_router_state_change(br, false);
889out:
890 spin_unlock(&br->multicast_lock);
891}
892
893static void br_multicast_querier_expired(struct net_bridge *br,
894 struct bridge_mcast_own_query *query)
895{
896 spin_lock(&br->multicast_lock);
897 if (!netif_running(br->dev) || br->multicast_disabled)
898 goto out;
899
900 br_multicast_start_querier(br, query);
901
902out:
903 spin_unlock(&br->multicast_lock);
904}
905
906static void br_ip4_multicast_querier_expired(struct timer_list *t)
907{
908 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
909
910 br_multicast_querier_expired(br, &br->ip4_own_query);
911}
912
913#if IS_ENABLED(CONFIG_IPV6)
914static void br_ip6_multicast_querier_expired(struct timer_list *t)
915{
916 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
917
918 br_multicast_querier_expired(br, &br->ip6_own_query);
919}
920#endif
921
922static void br_multicast_select_own_querier(struct net_bridge *br,
923 struct br_ip *ip,
924 struct sk_buff *skb)
925{
926 if (ip->proto == htons(ETH_P_IP))
927 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
928#if IS_ENABLED(CONFIG_IPV6)
929 else
930 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
931#endif
932}
933
934static void __br_multicast_send_query(struct net_bridge *br,
935 struct net_bridge_port *port,
936 struct br_ip *ip)
937{
938 struct sk_buff *skb;
939 u8 igmp_type;
940
941 skb = br_multicast_alloc_query(br, ip, &igmp_type);
942 if (!skb)
943 return;
944
945 if (port) {
946 skb->dev = port->dev;
947 br_multicast_count(br, port, skb, igmp_type,
948 BR_MCAST_DIR_TX);
949 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
950 dev_net(port->dev), NULL, skb, NULL, skb->dev,
951 br_dev_queue_push_xmit);
952 } else {
953 br_multicast_select_own_querier(br, ip, skb);
954 br_multicast_count(br, port, skb, igmp_type,
955 BR_MCAST_DIR_RX);
956 netif_rx(skb);
957 }
958}
959
960static void br_multicast_send_query(struct net_bridge *br,
961 struct net_bridge_port *port,
962 struct bridge_mcast_own_query *own_query)
963{
964 struct bridge_mcast_other_query *other_query = NULL;
965 struct br_ip br_group;
966 unsigned long time;
967
968 if (!netif_running(br->dev) || br->multicast_disabled ||
969 !br->multicast_querier)
970 return;
971
972 memset(&br_group.u, 0, sizeof(br_group.u));
973
974 if (port ? (own_query == &port->ip4_own_query) :
975 (own_query == &br->ip4_own_query)) {
976 other_query = &br->ip4_other_query;
977 br_group.proto = htons(ETH_P_IP);
978#if IS_ENABLED(CONFIG_IPV6)
979 } else {
980 other_query = &br->ip6_other_query;
981 br_group.proto = htons(ETH_P_IPV6);
982#endif
983 }
984
985 if (!other_query || timer_pending(&other_query->timer))
986 return;
987
988 __br_multicast_send_query(br, port, &br_group);
989
990 time = jiffies;
991 time += own_query->startup_sent < br->multicast_startup_query_count ?
992 br->multicast_startup_query_interval :
993 br->multicast_query_interval;
994 mod_timer(&own_query->timer, time);
995}
996
997static void
998br_multicast_port_query_expired(struct net_bridge_port *port,
999 struct bridge_mcast_own_query *query)
1000{
1001 struct net_bridge *br = port->br;
1002
1003 spin_lock(&br->multicast_lock);
1004 if (port->state == BR_STATE_DISABLED ||
1005 port->state == BR_STATE_BLOCKING)
1006 goto out;
1007
1008 if (query->startup_sent < br->multicast_startup_query_count)
1009 query->startup_sent++;
1010
1011 br_multicast_send_query(port->br, port, query);
1012
1013out:
1014 spin_unlock(&br->multicast_lock);
1015}
1016
1017static void br_ip4_multicast_port_query_expired(struct timer_list *t)
1018{
1019 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
1020
1021 br_multicast_port_query_expired(port, &port->ip4_own_query);
1022}
1023
1024#if IS_ENABLED(CONFIG_IPV6)
1025static void br_ip6_multicast_port_query_expired(struct timer_list *t)
1026{
1027 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
1028
1029 br_multicast_port_query_expired(port, &port->ip6_own_query);
1030}
1031#endif
1032
1033static void br_mc_disabled_update(struct net_device *dev, bool value)
1034{
1035 struct switchdev_attr attr = {
1036 .orig_dev = dev,
1037 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1038 .flags = SWITCHDEV_F_DEFER,
1039 .u.mc_disabled = value,
1040 };
1041
1042 switchdev_port_attr_set(dev, &attr);
1043}
1044
1045int br_multicast_add_port(struct net_bridge_port *port)
1046{
1047 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1048
1049 timer_setup(&port->multicast_router_timer,
1050 br_multicast_router_expired, 0);
1051 timer_setup(&port->ip4_own_query.timer,
1052 br_ip4_multicast_port_query_expired, 0);
1053#if IS_ENABLED(CONFIG_IPV6)
1054 timer_setup(&port->ip6_own_query.timer,
1055 br_ip6_multicast_port_query_expired, 0);
1056#endif
1057 br_mc_disabled_update(port->dev, port->br->multicast_disabled);
1058
1059 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1060 if (!port->mcast_stats)
1061 return -ENOMEM;
1062
1063 return 0;
1064}
1065
1066void br_multicast_del_port(struct net_bridge_port *port)
1067{
1068 struct net_bridge *br = port->br;
1069 struct net_bridge_port_group *pg;
1070 struct hlist_node *n;
1071
1072 /* Take care of the remaining groups, only perm ones should be left */
1073 spin_lock_bh(&br->multicast_lock);
1074 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1075 br_multicast_del_pg(br, pg);
1076 spin_unlock_bh(&br->multicast_lock);
1077 del_timer_sync(&port->multicast_router_timer);
1078 free_percpu(port->mcast_stats);
1079}
1080
1081static void br_multicast_enable(struct bridge_mcast_own_query *query)
1082{
1083 query->startup_sent = 0;
1084
1085 if (try_to_del_timer_sync(&query->timer) >= 0 ||
1086 del_timer(&query->timer))
1087 mod_timer(&query->timer, jiffies);
1088}
1089
1090static void __br_multicast_enable_port(struct net_bridge_port *port)
1091{
1092 struct net_bridge *br = port->br;
1093
1094 if (br->multicast_disabled || !netif_running(br->dev))
1095 return;
1096
1097 br_multicast_enable(&port->ip4_own_query);
1098#if IS_ENABLED(CONFIG_IPV6)
1099 br_multicast_enable(&port->ip6_own_query);
1100#endif
1101 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1102 hlist_unhashed(&port->rlist))
1103 br_multicast_add_router(br, port);
1104}
1105
1106void br_multicast_enable_port(struct net_bridge_port *port)
1107{
1108 struct net_bridge *br = port->br;
1109
1110 spin_lock(&br->multicast_lock);
1111 __br_multicast_enable_port(port);
1112 spin_unlock(&br->multicast_lock);
1113}
1114
1115void br_multicast_disable_port(struct net_bridge_port *port)
1116{
1117 struct net_bridge *br = port->br;
1118 struct net_bridge_port_group *pg;
1119 struct hlist_node *n;
1120
1121 spin_lock(&br->multicast_lock);
1122 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1123 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1124 br_multicast_del_pg(br, pg);
1125
1126 __del_port_router(port);
1127
1128 del_timer(&port->multicast_router_timer);
1129 del_timer(&port->ip4_own_query.timer);
1130#if IS_ENABLED(CONFIG_IPV6)
1131 del_timer(&port->ip6_own_query.timer);
1132#endif
1133 spin_unlock(&br->multicast_lock);
1134}
1135
1136static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1137 struct net_bridge_port *port,
1138 struct sk_buff *skb,
1139 u16 vid)
1140{
1141 const unsigned char *src;
1142 struct igmpv3_report *ih;
1143 struct igmpv3_grec *grec;
1144 int i;
1145 int len;
1146 int num;
1147 int type;
1148 int err = 0;
1149 __be32 group;
1150
1151 ih = igmpv3_report_hdr(skb);
1152 num = ntohs(ih->ngrec);
1153 len = skb_transport_offset(skb) + sizeof(*ih);
1154
1155 for (i = 0; i < num; i++) {
1156 len += sizeof(*grec);
1157 if (!pskb_may_pull(skb, len))
1158 return -EINVAL;
1159
1160 grec = (void *)(skb->data + len - sizeof(*grec));
1161 group = grec->grec_mca;
1162 type = grec->grec_type;
1163
1164 len += ntohs(grec->grec_nsrcs) * 4;
1165 if (!pskb_may_pull(skb, len))
1166 return -EINVAL;
1167
1168 /* We treat this as an IGMPv2 report for now. */
1169 switch (type) {
1170 case IGMPV3_MODE_IS_INCLUDE:
1171 case IGMPV3_MODE_IS_EXCLUDE:
1172 case IGMPV3_CHANGE_TO_INCLUDE:
1173 case IGMPV3_CHANGE_TO_EXCLUDE:
1174 case IGMPV3_ALLOW_NEW_SOURCES:
1175 case IGMPV3_BLOCK_OLD_SOURCES:
1176 break;
1177
1178 default:
1179 continue;
1180 }
1181
1182 src = eth_hdr(skb)->h_source;
1183 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1184 type == IGMPV3_MODE_IS_INCLUDE) &&
1185 ntohs(grec->grec_nsrcs) == 0) {
1186 br_ip4_multicast_leave_group(br, port, group, vid, src);
1187 } else {
1188 err = br_ip4_multicast_add_group(br, port, group, vid,
1189 src);
1190 if (err)
1191 break;
1192 }
1193 }
1194
1195 return err;
1196}
1197
1198#if IS_ENABLED(CONFIG_IPV6)
1199static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1200 struct net_bridge_port *port,
1201 struct sk_buff *skb,
1202 u16 vid)
1203{
1204 const unsigned char *src;
1205 struct icmp6hdr *icmp6h;
1206 struct mld2_grec *grec;
1207 int i;
1208 int len;
1209 int num;
1210 int err = 0;
1211
1212 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1213 return -EINVAL;
1214
1215 icmp6h = icmp6_hdr(skb);
1216 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1217 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1218
1219 for (i = 0; i < num; i++) {
1220 __be16 *nsrcs, _nsrcs;
1221
1222 nsrcs = skb_header_pointer(skb,
1223 len + offsetof(struct mld2_grec,
1224 grec_nsrcs),
1225 sizeof(_nsrcs), &_nsrcs);
1226 if (!nsrcs)
1227 return -EINVAL;
1228
1229 if (!pskb_may_pull(skb,
1230 len + sizeof(*grec) +
1231 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1232 return -EINVAL;
1233
1234 grec = (struct mld2_grec *)(skb->data + len);
1235 len += sizeof(*grec) +
1236 sizeof(struct in6_addr) * ntohs(*nsrcs);
1237
1238 /* We treat these as MLDv1 reports for now. */
1239 switch (grec->grec_type) {
1240 case MLD2_MODE_IS_INCLUDE:
1241 case MLD2_MODE_IS_EXCLUDE:
1242 case MLD2_CHANGE_TO_INCLUDE:
1243 case MLD2_CHANGE_TO_EXCLUDE:
1244 case MLD2_ALLOW_NEW_SOURCES:
1245 case MLD2_BLOCK_OLD_SOURCES:
1246 break;
1247
1248 default:
1249 continue;
1250 }
1251
1252 src = eth_hdr(skb)->h_source;
1253 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1254 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1255 ntohs(*nsrcs) == 0) {
1256 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1257 vid, src);
1258 } else {
1259 err = br_ip6_multicast_add_group(br, port,
1260 &grec->grec_mca, vid,
1261 src);
1262 if (err)
1263 break;
1264 }
1265 }
1266
1267 return err;
1268}
1269#endif
1270
1271static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1272 struct net_bridge_port *port,
1273 __be32 saddr)
1274{
1275 if (!timer_pending(&br->ip4_own_query.timer) &&
1276 !timer_pending(&br->ip4_other_query.timer))
1277 goto update;
1278
1279 if (!br->ip4_querier.addr.u.ip4)
1280 goto update;
1281
1282 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1283 goto update;
1284
1285 return false;
1286
1287update:
1288 br->ip4_querier.addr.u.ip4 = saddr;
1289
1290 /* update protected by general multicast_lock by caller */
1291 rcu_assign_pointer(br->ip4_querier.port, port);
1292
1293 return true;
1294}
1295
1296#if IS_ENABLED(CONFIG_IPV6)
1297static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1298 struct net_bridge_port *port,
1299 struct in6_addr *saddr)
1300{
1301 if (!timer_pending(&br->ip6_own_query.timer) &&
1302 !timer_pending(&br->ip6_other_query.timer))
1303 goto update;
1304
1305 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1306 goto update;
1307
1308 return false;
1309
1310update:
1311 br->ip6_querier.addr.u.ip6 = *saddr;
1312
1313 /* update protected by general multicast_lock by caller */
1314 rcu_assign_pointer(br->ip6_querier.port, port);
1315
1316 return true;
1317}
1318#endif
1319
1320static bool br_multicast_select_querier(struct net_bridge *br,
1321 struct net_bridge_port *port,
1322 struct br_ip *saddr)
1323{
1324 switch (saddr->proto) {
1325 case htons(ETH_P_IP):
1326 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1327#if IS_ENABLED(CONFIG_IPV6)
1328 case htons(ETH_P_IPV6):
1329 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1330#endif
1331 }
1332
1333 return false;
1334}
1335
1336static void
1337br_multicast_update_query_timer(struct net_bridge *br,
1338 struct bridge_mcast_other_query *query,
1339 unsigned long max_delay)
1340{
1341 if (!timer_pending(&query->timer))
1342 query->delay_time = jiffies + max_delay;
1343
1344 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1345}
1346
1347static void br_port_mc_router_state_change(struct net_bridge_port *p,
1348 bool is_mc_router)
1349{
1350 struct switchdev_attr attr = {
1351 .orig_dev = p->dev,
1352 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1353 .flags = SWITCHDEV_F_DEFER,
1354 .u.mrouter = is_mc_router,
1355 };
1356
1357 switchdev_port_attr_set(p->dev, &attr);
1358}
1359
1360/*
1361 * Add port to router_list
1362 * list is maintained ordered by pointer value
1363 * and locked by br->multicast_lock and RCU
1364 */
1365static void br_multicast_add_router(struct net_bridge *br,
1366 struct net_bridge_port *port)
1367{
1368 struct net_bridge_port *p;
1369 struct hlist_node *slot = NULL;
1370
1371 if (!hlist_unhashed(&port->rlist))
1372 return;
1373
1374 hlist_for_each_entry(p, &br->router_list, rlist) {
1375 if ((unsigned long) port >= (unsigned long) p)
1376 break;
1377 slot = &p->rlist;
1378 }
1379
1380 if (slot)
1381 hlist_add_behind_rcu(&port->rlist, slot);
1382 else
1383 hlist_add_head_rcu(&port->rlist, &br->router_list);
1384 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1385 br_port_mc_router_state_change(port, true);
1386}
1387
1388static void br_multicast_mark_router(struct net_bridge *br,
1389 struct net_bridge_port *port)
1390{
1391 unsigned long now = jiffies;
1392
1393 if (!port) {
1394 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1395 if (!timer_pending(&br->multicast_router_timer))
1396 br_mc_router_state_change(br, true);
1397 mod_timer(&br->multicast_router_timer,
1398 now + br->multicast_querier_interval);
1399 }
1400 return;
1401 }
1402
1403 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1404 port->multicast_router == MDB_RTR_TYPE_PERM)
1405 return;
1406
1407 br_multicast_add_router(br, port);
1408
1409 mod_timer(&port->multicast_router_timer,
1410 now + br->multicast_querier_interval);
1411}
1412
1413static void br_multicast_query_received(struct net_bridge *br,
1414 struct net_bridge_port *port,
1415 struct bridge_mcast_other_query *query,
1416 struct br_ip *saddr,
1417 unsigned long max_delay)
1418{
1419 if (!br_multicast_select_querier(br, port, saddr))
1420 return;
1421
1422 br_multicast_update_query_timer(br, query, max_delay);
1423 br_multicast_mark_router(br, port);
1424}
1425
1426static int br_ip4_multicast_query(struct net_bridge *br,
1427 struct net_bridge_port *port,
1428 struct sk_buff *skb,
1429 u16 vid)
1430{
1431 const struct iphdr *iph = ip_hdr(skb);
1432 struct igmphdr *ih = igmp_hdr(skb);
1433 struct net_bridge_mdb_entry *mp;
1434 struct igmpv3_query *ih3;
1435 struct net_bridge_port_group *p;
1436 struct net_bridge_port_group __rcu **pp;
1437 struct br_ip saddr;
1438 unsigned long max_delay;
1439 unsigned long now = jiffies;
1440 unsigned int offset = skb_transport_offset(skb);
1441 __be32 group;
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 group = ih->group;
1450
1451 if (skb->len == offset + sizeof(*ih)) {
1452 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1453
1454 if (!max_delay) {
1455 max_delay = 10 * HZ;
1456 group = 0;
1457 }
1458 } else if (skb->len >= offset + sizeof(*ih3)) {
1459 ih3 = igmpv3_query_hdr(skb);
1460 if (ih3->nsrcs)
1461 goto out;
1462
1463 max_delay = ih3->code ?
1464 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1465 } else {
1466 goto out;
1467 }
1468
1469 if (!group) {
1470 saddr.proto = htons(ETH_P_IP);
1471 saddr.u.ip4 = iph->saddr;
1472
1473 br_multicast_query_received(br, port, &br->ip4_other_query,
1474 &saddr, max_delay);
1475 goto out;
1476 }
1477
1478 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1479 if (!mp)
1480 goto out;
1481
1482 max_delay *= br->multicast_last_member_count;
1483
1484 if (mp->host_joined &&
1485 (timer_pending(&mp->timer) ?
1486 time_after(mp->timer.expires, now + max_delay) :
1487 try_to_del_timer_sync(&mp->timer) >= 0))
1488 mod_timer(&mp->timer, now + max_delay);
1489
1490 for (pp = &mp->ports;
1491 (p = mlock_dereference(*pp, br)) != NULL;
1492 pp = &p->next) {
1493 if (timer_pending(&p->timer) ?
1494 time_after(p->timer.expires, now + max_delay) :
1495 try_to_del_timer_sync(&p->timer) >= 0)
1496 mod_timer(&p->timer, now + max_delay);
1497 }
1498
1499out:
1500 spin_unlock(&br->multicast_lock);
1501 return err;
1502}
1503
1504#if IS_ENABLED(CONFIG_IPV6)
1505static int br_ip6_multicast_query(struct net_bridge *br,
1506 struct net_bridge_port *port,
1507 struct sk_buff *skb,
1508 u16 vid)
1509{
1510 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1511 struct mld_msg *mld;
1512 struct net_bridge_mdb_entry *mp;
1513 struct mld2_query *mld2q;
1514 struct net_bridge_port_group *p;
1515 struct net_bridge_port_group __rcu **pp;
1516 struct br_ip saddr;
1517 unsigned long max_delay;
1518 unsigned long now = jiffies;
1519 unsigned int offset = skb_transport_offset(skb);
1520 const struct in6_addr *group = NULL;
1521 bool is_general_query;
1522 int err = 0;
1523
1524 spin_lock(&br->multicast_lock);
1525 if (!netif_running(br->dev) ||
1526 (port && port->state == BR_STATE_DISABLED))
1527 goto out;
1528
1529 if (skb->len == offset + sizeof(*mld)) {
1530 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1531 err = -EINVAL;
1532 goto out;
1533 }
1534 mld = (struct mld_msg *) icmp6_hdr(skb);
1535 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1536 if (max_delay)
1537 group = &mld->mld_mca;
1538 } else {
1539 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1540 err = -EINVAL;
1541 goto out;
1542 }
1543 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1544 if (!mld2q->mld2q_nsrcs)
1545 group = &mld2q->mld2q_mca;
1546
1547 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1548 }
1549
1550 is_general_query = group && ipv6_addr_any(group);
1551
1552 if (is_general_query) {
1553 saddr.proto = htons(ETH_P_IPV6);
1554 saddr.u.ip6 = ip6h->saddr;
1555
1556 br_multicast_query_received(br, port, &br->ip6_other_query,
1557 &saddr, max_delay);
1558 goto out;
1559 } else if (!group) {
1560 goto out;
1561 }
1562
1563 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1564 if (!mp)
1565 goto out;
1566
1567 max_delay *= br->multicast_last_member_count;
1568 if (mp->host_joined &&
1569 (timer_pending(&mp->timer) ?
1570 time_after(mp->timer.expires, now + max_delay) :
1571 try_to_del_timer_sync(&mp->timer) >= 0))
1572 mod_timer(&mp->timer, now + max_delay);
1573
1574 for (pp = &mp->ports;
1575 (p = mlock_dereference(*pp, br)) != NULL;
1576 pp = &p->next) {
1577 if (timer_pending(&p->timer) ?
1578 time_after(p->timer.expires, now + max_delay) :
1579 try_to_del_timer_sync(&p->timer) >= 0)
1580 mod_timer(&p->timer, now + max_delay);
1581 }
1582
1583out:
1584 spin_unlock(&br->multicast_lock);
1585 return err;
1586}
1587#endif
1588
1589static void
1590br_multicast_leave_group(struct net_bridge *br,
1591 struct net_bridge_port *port,
1592 struct br_ip *group,
1593 struct bridge_mcast_other_query *other_query,
1594 struct bridge_mcast_own_query *own_query,
1595 const unsigned char *src)
1596{
1597 struct net_bridge_mdb_htable *mdb;
1598 struct net_bridge_mdb_entry *mp;
1599 struct net_bridge_port_group *p;
1600 unsigned long now;
1601 unsigned long time;
1602
1603 spin_lock(&br->multicast_lock);
1604 if (!netif_running(br->dev) ||
1605 (port && port->state == BR_STATE_DISABLED))
1606 goto out;
1607
1608 mdb = mlock_dereference(br->mdb, br);
1609 mp = br_mdb_ip_get(mdb, group);
1610 if (!mp)
1611 goto out;
1612
1613 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1614 struct net_bridge_port_group __rcu **pp;
1615
1616 for (pp = &mp->ports;
1617 (p = mlock_dereference(*pp, br)) != NULL;
1618 pp = &p->next) {
1619 if (!br_port_group_equal(p, port, src))
1620 continue;
1621
1622 rcu_assign_pointer(*pp, p->next);
1623 hlist_del_init(&p->mglist);
1624 del_timer(&p->timer);
1625 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1626 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1627 p->flags);
1628
1629 if (!mp->ports && !mp->host_joined &&
1630 netif_running(br->dev))
1631 mod_timer(&mp->timer, jiffies);
1632 }
1633 goto out;
1634 }
1635
1636 if (timer_pending(&other_query->timer))
1637 goto out;
1638
1639 if (br->multicast_querier) {
1640 __br_multicast_send_query(br, port, &mp->addr);
1641
1642 time = jiffies + br->multicast_last_member_count *
1643 br->multicast_last_member_interval;
1644
1645 mod_timer(&own_query->timer, time);
1646
1647 for (p = mlock_dereference(mp->ports, br);
1648 p != NULL;
1649 p = mlock_dereference(p->next, br)) {
1650 if (!br_port_group_equal(p, port, src))
1651 continue;
1652
1653 if (!hlist_unhashed(&p->mglist) &&
1654 (timer_pending(&p->timer) ?
1655 time_after(p->timer.expires, time) :
1656 try_to_del_timer_sync(&p->timer) >= 0)) {
1657 mod_timer(&p->timer, time);
1658 }
1659
1660 break;
1661 }
1662 }
1663
1664 now = jiffies;
1665 time = now + br->multicast_last_member_count *
1666 br->multicast_last_member_interval;
1667
1668 if (!port) {
1669 if (mp->host_joined &&
1670 (timer_pending(&mp->timer) ?
1671 time_after(mp->timer.expires, time) :
1672 try_to_del_timer_sync(&mp->timer) >= 0)) {
1673 mod_timer(&mp->timer, time);
1674 }
1675
1676 goto out;
1677 }
1678
1679 for (p = mlock_dereference(mp->ports, br);
1680 p != NULL;
1681 p = mlock_dereference(p->next, br)) {
1682 if (p->port != port)
1683 continue;
1684
1685 if (!hlist_unhashed(&p->mglist) &&
1686 (timer_pending(&p->timer) ?
1687 time_after(p->timer.expires, time) :
1688 try_to_del_timer_sync(&p->timer) >= 0)) {
1689 mod_timer(&p->timer, time);
1690 }
1691
1692 break;
1693 }
1694out:
1695 spin_unlock(&br->multicast_lock);
1696}
1697
1698static void br_ip4_multicast_leave_group(struct net_bridge *br,
1699 struct net_bridge_port *port,
1700 __be32 group,
1701 __u16 vid,
1702 const unsigned char *src)
1703{
1704 struct br_ip br_group;
1705 struct bridge_mcast_own_query *own_query;
1706
1707 if (ipv4_is_local_multicast(group))
1708 return;
1709
1710 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1711
1712 br_group.u.ip4 = group;
1713 br_group.proto = htons(ETH_P_IP);
1714 br_group.vid = vid;
1715
1716 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1717 own_query, src);
1718}
1719
1720#if IS_ENABLED(CONFIG_IPV6)
1721static void br_ip6_multicast_leave_group(struct net_bridge *br,
1722 struct net_bridge_port *port,
1723 const struct in6_addr *group,
1724 __u16 vid,
1725 const unsigned char *src)
1726{
1727 struct br_ip br_group;
1728 struct bridge_mcast_own_query *own_query;
1729
1730 if (ipv6_addr_is_ll_all_nodes(group))
1731 return;
1732
1733 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1734
1735 br_group.u.ip6 = *group;
1736 br_group.proto = htons(ETH_P_IPV6);
1737 br_group.vid = vid;
1738
1739 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1740 own_query, src);
1741}
1742#endif
1743
1744static void br_multicast_err_count(const struct net_bridge *br,
1745 const struct net_bridge_port *p,
1746 __be16 proto)
1747{
1748 struct bridge_mcast_stats __percpu *stats;
1749 struct bridge_mcast_stats *pstats;
1750
1751 if (!br->multicast_stats_enabled)
1752 return;
1753
1754 if (p)
1755 stats = p->mcast_stats;
1756 else
1757 stats = br->mcast_stats;
1758 if (WARN_ON(!stats))
1759 return;
1760
1761 pstats = this_cpu_ptr(stats);
1762
1763 u64_stats_update_begin(&pstats->syncp);
1764 switch (proto) {
1765 case htons(ETH_P_IP):
1766 pstats->mstats.igmp_parse_errors++;
1767 break;
1768#if IS_ENABLED(CONFIG_IPV6)
1769 case htons(ETH_P_IPV6):
1770 pstats->mstats.mld_parse_errors++;
1771 break;
1772#endif
1773 }
1774 u64_stats_update_end(&pstats->syncp);
1775}
1776
1777static void br_multicast_pim(struct net_bridge *br,
1778 struct net_bridge_port *port,
1779 const struct sk_buff *skb)
1780{
1781 unsigned int offset = skb_transport_offset(skb);
1782 struct pimhdr *pimhdr, _pimhdr;
1783
1784 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1785 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1786 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1787 return;
1788
1789 br_multicast_mark_router(br, port);
1790}
1791
1792static int br_multicast_ipv4_rcv(struct net_bridge *br,
1793 struct net_bridge_port *port,
1794 struct sk_buff *skb,
1795 u16 vid)
1796{
1797 struct sk_buff *skb_trimmed = NULL;
1798 const unsigned char *src;
1799 struct igmphdr *ih;
1800 int err;
1801
1802 err = ip_mc_check_igmp(skb, &skb_trimmed);
1803
1804 if (err == -ENOMSG) {
1805 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1806 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1807 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1808 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1809 br_multicast_pim(br, port, skb);
1810 }
1811 return 0;
1812 } else if (err < 0) {
1813 br_multicast_err_count(br, port, skb->protocol);
1814 return err;
1815 }
1816
1817 ih = igmp_hdr(skb);
1818 src = eth_hdr(skb)->h_source;
1819 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1820
1821 switch (ih->type) {
1822 case IGMP_HOST_MEMBERSHIP_REPORT:
1823 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1824 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1825 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1826 break;
1827 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1828 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1829 break;
1830 case IGMP_HOST_MEMBERSHIP_QUERY:
1831 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1832 break;
1833 case IGMP_HOST_LEAVE_MESSAGE:
1834 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1835 break;
1836 }
1837
1838 if (skb_trimmed && skb_trimmed != skb)
1839 kfree_skb(skb_trimmed);
1840
1841 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1842 BR_MCAST_DIR_RX);
1843
1844 return err;
1845}
1846
1847#if IS_ENABLED(CONFIG_IPV6)
1848static int br_multicast_ipv6_rcv(struct net_bridge *br,
1849 struct net_bridge_port *port,
1850 struct sk_buff *skb,
1851 u16 vid)
1852{
1853 struct sk_buff *skb_trimmed = NULL;
1854 const unsigned char *src;
1855 struct mld_msg *mld;
1856 int err;
1857
1858 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1859
1860 if (err == -ENOMSG) {
1861 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1862 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1863 return 0;
1864 } else if (err < 0) {
1865 br_multicast_err_count(br, port, skb->protocol);
1866 return err;
1867 }
1868
1869 mld = (struct mld_msg *)skb_transport_header(skb);
1870 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1871
1872 switch (mld->mld_type) {
1873 case ICMPV6_MGM_REPORT:
1874 src = eth_hdr(skb)->h_source;
1875 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1876 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1877 src);
1878 break;
1879 case ICMPV6_MLD2_REPORT:
1880 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1881 break;
1882 case ICMPV6_MGM_QUERY:
1883 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1884 break;
1885 case ICMPV6_MGM_REDUCTION:
1886 src = eth_hdr(skb)->h_source;
1887 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1888 break;
1889 }
1890
1891 if (skb_trimmed && skb_trimmed != skb)
1892 kfree_skb(skb_trimmed);
1893
1894 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1895 BR_MCAST_DIR_RX);
1896
1897 return err;
1898}
1899#endif
1900
1901int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1902 struct sk_buff *skb, u16 vid)
1903{
1904 int ret = 0;
1905
1906 BR_INPUT_SKB_CB(skb)->igmp = 0;
1907 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1908
1909 if (br->multicast_disabled)
1910 return 0;
1911
1912 switch (skb->protocol) {
1913 case htons(ETH_P_IP):
1914 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1915 break;
1916#if IS_ENABLED(CONFIG_IPV6)
1917 case htons(ETH_P_IPV6):
1918 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1919 break;
1920#endif
1921 }
1922
1923 return ret;
1924}
1925
1926static void br_multicast_query_expired(struct net_bridge *br,
1927 struct bridge_mcast_own_query *query,
1928 struct bridge_mcast_querier *querier)
1929{
1930 spin_lock(&br->multicast_lock);
1931 if (query->startup_sent < br->multicast_startup_query_count)
1932 query->startup_sent++;
1933
1934 RCU_INIT_POINTER(querier->port, NULL);
1935 br_multicast_send_query(br, NULL, query);
1936 spin_unlock(&br->multicast_lock);
1937}
1938
1939static void br_ip4_multicast_query_expired(struct timer_list *t)
1940{
1941 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1942
1943 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1944}
1945
1946#if IS_ENABLED(CONFIG_IPV6)
1947static void br_ip6_multicast_query_expired(struct timer_list *t)
1948{
1949 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1950
1951 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1952}
1953#endif
1954
1955void br_multicast_init(struct net_bridge *br)
1956{
1957 br->hash_elasticity = 4;
1958 br->hash_max = 512;
1959
1960 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1961 br->multicast_querier = 0;
1962 br->multicast_query_use_ifaddr = 0;
1963 br->multicast_last_member_count = 2;
1964 br->multicast_startup_query_count = 2;
1965
1966 br->multicast_last_member_interval = HZ;
1967 br->multicast_query_response_interval = 10 * HZ;
1968 br->multicast_startup_query_interval = 125 * HZ / 4;
1969 br->multicast_query_interval = 125 * HZ;
1970 br->multicast_querier_interval = 255 * HZ;
1971 br->multicast_membership_interval = 260 * HZ;
1972
1973 br->ip4_other_query.delay_time = 0;
1974 br->ip4_querier.port = NULL;
1975 br->multicast_igmp_version = 2;
1976#if IS_ENABLED(CONFIG_IPV6)
1977 br->multicast_mld_version = 1;
1978 br->ip6_other_query.delay_time = 0;
1979 br->ip6_querier.port = NULL;
1980#endif
1981 br->has_ipv6_addr = 1;
1982
1983 spin_lock_init(&br->multicast_lock);
1984 timer_setup(&br->multicast_router_timer,
1985 br_multicast_local_router_expired, 0);
1986 timer_setup(&br->ip4_other_query.timer,
1987 br_ip4_multicast_querier_expired, 0);
1988 timer_setup(&br->ip4_own_query.timer,
1989 br_ip4_multicast_query_expired, 0);
1990#if IS_ENABLED(CONFIG_IPV6)
1991 timer_setup(&br->ip6_other_query.timer,
1992 br_ip6_multicast_querier_expired, 0);
1993 timer_setup(&br->ip6_own_query.timer,
1994 br_ip6_multicast_query_expired, 0);
1995#endif
1996}
1997
1998static void __br_multicast_open(struct net_bridge *br,
1999 struct bridge_mcast_own_query *query)
2000{
2001 query->startup_sent = 0;
2002
2003 if (br->multicast_disabled)
2004 return;
2005
2006 mod_timer(&query->timer, jiffies);
2007}
2008
2009void br_multicast_open(struct net_bridge *br)
2010{
2011 __br_multicast_open(br, &br->ip4_own_query);
2012#if IS_ENABLED(CONFIG_IPV6)
2013 __br_multicast_open(br, &br->ip6_own_query);
2014#endif
2015}
2016
2017void br_multicast_stop(struct net_bridge *br)
2018{
2019 del_timer_sync(&br->multicast_router_timer);
2020 del_timer_sync(&br->ip4_other_query.timer);
2021 del_timer_sync(&br->ip4_own_query.timer);
2022#if IS_ENABLED(CONFIG_IPV6)
2023 del_timer_sync(&br->ip6_other_query.timer);
2024 del_timer_sync(&br->ip6_own_query.timer);
2025#endif
2026}
2027
2028void br_multicast_dev_del(struct net_bridge *br)
2029{
2030 struct net_bridge_mdb_htable *mdb;
2031 struct net_bridge_mdb_entry *mp;
2032 struct hlist_node *n;
2033 u32 ver;
2034 int i;
2035
2036 spin_lock_bh(&br->multicast_lock);
2037 mdb = mlock_dereference(br->mdb, br);
2038 if (!mdb)
2039 goto out;
2040
2041 br->mdb = NULL;
2042
2043 ver = mdb->ver;
2044 for (i = 0; i < mdb->max; i++) {
2045 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
2046 hlist[ver]) {
2047 del_timer(&mp->timer);
2048 call_rcu_bh(&mp->rcu, br_multicast_free_group);
2049 }
2050 }
2051
2052 if (mdb->old) {
2053 spin_unlock_bh(&br->multicast_lock);
2054 rcu_barrier_bh();
2055 spin_lock_bh(&br->multicast_lock);
2056 WARN_ON(mdb->old);
2057 }
2058
2059 mdb->old = mdb;
2060 call_rcu_bh(&mdb->rcu, br_mdb_free);
2061
2062out:
2063 spin_unlock_bh(&br->multicast_lock);
2064}
2065
2066int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2067{
2068 int err = -EINVAL;
2069
2070 spin_lock_bh(&br->multicast_lock);
2071
2072 switch (val) {
2073 case MDB_RTR_TYPE_DISABLED:
2074 case MDB_RTR_TYPE_PERM:
2075 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
2076 del_timer(&br->multicast_router_timer);
2077 br->multicast_router = val;
2078 err = 0;
2079 break;
2080 case MDB_RTR_TYPE_TEMP_QUERY:
2081 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
2082 br_mc_router_state_change(br, false);
2083 br->multicast_router = val;
2084 err = 0;
2085 break;
2086 }
2087
2088 spin_unlock_bh(&br->multicast_lock);
2089
2090 return err;
2091}
2092
2093static void __del_port_router(struct net_bridge_port *p)
2094{
2095 if (hlist_unhashed(&p->rlist))
2096 return;
2097 hlist_del_init_rcu(&p->rlist);
2098 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2099 br_port_mc_router_state_change(p, false);
2100
2101 /* don't allow timer refresh */
2102 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2103 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2104}
2105
2106int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2107{
2108 struct net_bridge *br = p->br;
2109 unsigned long now = jiffies;
2110 int err = -EINVAL;
2111
2112 spin_lock(&br->multicast_lock);
2113 if (p->multicast_router == val) {
2114 /* Refresh the temp router port timer */
2115 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2116 mod_timer(&p->multicast_router_timer,
2117 now + br->multicast_querier_interval);
2118 err = 0;
2119 goto unlock;
2120 }
2121 switch (val) {
2122 case MDB_RTR_TYPE_DISABLED:
2123 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2124 __del_port_router(p);
2125 del_timer(&p->multicast_router_timer);
2126 break;
2127 case MDB_RTR_TYPE_TEMP_QUERY:
2128 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2129 __del_port_router(p);
2130 break;
2131 case MDB_RTR_TYPE_PERM:
2132 p->multicast_router = MDB_RTR_TYPE_PERM;
2133 del_timer(&p->multicast_router_timer);
2134 br_multicast_add_router(br, p);
2135 break;
2136 case MDB_RTR_TYPE_TEMP:
2137 p->multicast_router = MDB_RTR_TYPE_TEMP;
2138 br_multicast_mark_router(br, p);
2139 break;
2140 default:
2141 goto unlock;
2142 }
2143 err = 0;
2144unlock:
2145 spin_unlock(&br->multicast_lock);
2146
2147 return err;
2148}
2149
2150static void br_multicast_start_querier(struct net_bridge *br,
2151 struct bridge_mcast_own_query *query)
2152{
2153 struct net_bridge_port *port;
2154
2155 __br_multicast_open(br, query);
2156
2157 list_for_each_entry(port, &br->port_list, list) {
2158 if (port->state == BR_STATE_DISABLED ||
2159 port->state == BR_STATE_BLOCKING)
2160 continue;
2161
2162 if (query == &br->ip4_own_query)
2163 br_multicast_enable(&port->ip4_own_query);
2164#if IS_ENABLED(CONFIG_IPV6)
2165 else
2166 br_multicast_enable(&port->ip6_own_query);
2167#endif
2168 }
2169}
2170
2171int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2172{
2173 struct net_bridge_mdb_htable *mdb;
2174 struct net_bridge_port *port;
2175 int err = 0;
2176
2177 spin_lock_bh(&br->multicast_lock);
2178 if (br->multicast_disabled == !val)
2179 goto unlock;
2180
2181 br_mc_disabled_update(br->dev, !val);
2182 br->multicast_disabled = !val;
2183 if (br->multicast_disabled)
2184 goto unlock;
2185
2186 if (!netif_running(br->dev))
2187 goto unlock;
2188
2189 mdb = mlock_dereference(br->mdb, br);
2190 if (mdb) {
2191 if (mdb->old) {
2192 err = -EEXIST;
2193rollback:
2194 br->multicast_disabled = !!val;
2195 goto unlock;
2196 }
2197
2198 err = br_mdb_rehash(&br->mdb, mdb->max,
2199 br->hash_elasticity);
2200 if (err)
2201 goto rollback;
2202 }
2203
2204 br_multicast_open(br);
2205 list_for_each_entry(port, &br->port_list, list)
2206 __br_multicast_enable_port(port);
2207
2208unlock:
2209 spin_unlock_bh(&br->multicast_lock);
2210
2211 return err;
2212}
2213
2214bool br_multicast_enabled(const struct net_device *dev)
2215{
2216 struct net_bridge *br = netdev_priv(dev);
2217
2218 return !br->multicast_disabled;
2219}
2220EXPORT_SYMBOL_GPL(br_multicast_enabled);
2221
2222bool br_multicast_router(const struct net_device *dev)
2223{
2224 struct net_bridge *br = netdev_priv(dev);
2225 bool is_router;
2226
2227 spin_lock_bh(&br->multicast_lock);
2228 is_router = br_multicast_is_router(br);
2229 spin_unlock_bh(&br->multicast_lock);
2230 return is_router;
2231}
2232EXPORT_SYMBOL_GPL(br_multicast_router);
2233
2234int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2235{
2236 unsigned long max_delay;
2237
2238 val = !!val;
2239
2240 spin_lock_bh(&br->multicast_lock);
2241 if (br->multicast_querier == val)
2242 goto unlock;
2243
2244 br->multicast_querier = val;
2245 if (!val)
2246 goto unlock;
2247
2248 max_delay = br->multicast_query_response_interval;
2249
2250 if (!timer_pending(&br->ip4_other_query.timer))
2251 br->ip4_other_query.delay_time = jiffies + max_delay;
2252
2253 br_multicast_start_querier(br, &br->ip4_own_query);
2254
2255#if IS_ENABLED(CONFIG_IPV6)
2256 if (!timer_pending(&br->ip6_other_query.timer))
2257 br->ip6_other_query.delay_time = jiffies + max_delay;
2258
2259 br_multicast_start_querier(br, &br->ip6_own_query);
2260#endif
2261
2262unlock:
2263 spin_unlock_bh(&br->multicast_lock);
2264
2265 return 0;
2266}
2267
2268int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2269{
2270 int err = -EINVAL;
2271 u32 old;
2272 struct net_bridge_mdb_htable *mdb;
2273
2274 spin_lock_bh(&br->multicast_lock);
2275 if (!is_power_of_2(val))
2276 goto unlock;
2277
2278 mdb = mlock_dereference(br->mdb, br);
2279 if (mdb && val < mdb->size)
2280 goto unlock;
2281
2282 err = 0;
2283
2284 old = br->hash_max;
2285 br->hash_max = val;
2286
2287 if (mdb) {
2288 if (mdb->old) {
2289 err = -EEXIST;
2290rollback:
2291 br->hash_max = old;
2292 goto unlock;
2293 }
2294
2295 err = br_mdb_rehash(&br->mdb, br->hash_max,
2296 br->hash_elasticity);
2297 if (err)
2298 goto rollback;
2299 }
2300
2301unlock:
2302 spin_unlock_bh(&br->multicast_lock);
2303
2304 return err;
2305}
2306
2307int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2308{
2309 /* Currently we support only version 2 and 3 */
2310 switch (val) {
2311 case 2:
2312 case 3:
2313 break;
2314 default:
2315 return -EINVAL;
2316 }
2317
2318 spin_lock_bh(&br->multicast_lock);
2319 br->multicast_igmp_version = val;
2320 spin_unlock_bh(&br->multicast_lock);
2321
2322 return 0;
2323}
2324
2325#if IS_ENABLED(CONFIG_IPV6)
2326int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2327{
2328 /* Currently we support version 1 and 2 */
2329 switch (val) {
2330 case 1:
2331 case 2:
2332 break;
2333 default:
2334 return -EINVAL;
2335 }
2336
2337 spin_lock_bh(&br->multicast_lock);
2338 br->multicast_mld_version = val;
2339 spin_unlock_bh(&br->multicast_lock);
2340
2341 return 0;
2342}
2343#endif
2344
2345/**
2346 * br_multicast_list_adjacent - Returns snooped multicast addresses
2347 * @dev: The bridge port adjacent to which to retrieve addresses
2348 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2349 *
2350 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2351 * snooping feature on all bridge ports of dev's bridge device, excluding
2352 * the addresses from dev itself.
2353 *
2354 * Returns the number of items added to br_ip_list.
2355 *
2356 * Notes:
2357 * - br_ip_list needs to be initialized by caller
2358 * - br_ip_list might contain duplicates in the end
2359 * (needs to be taken care of by caller)
2360 * - br_ip_list needs to be freed by caller
2361 */
2362int br_multicast_list_adjacent(struct net_device *dev,
2363 struct list_head *br_ip_list)
2364{
2365 struct net_bridge *br;
2366 struct net_bridge_port *port;
2367 struct net_bridge_port_group *group;
2368 struct br_ip_list *entry;
2369 int count = 0;
2370
2371 rcu_read_lock();
2372 if (!br_ip_list || !br_port_exists(dev))
2373 goto unlock;
2374
2375 port = br_port_get_rcu(dev);
2376 if (!port || !port->br)
2377 goto unlock;
2378
2379 br = port->br;
2380
2381 list_for_each_entry_rcu(port, &br->port_list, list) {
2382 if (!port->dev || port->dev == dev)
2383 continue;
2384
2385 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2386 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2387 if (!entry)
2388 goto unlock;
2389
2390 entry->addr = group->addr;
2391 list_add(&entry->list, br_ip_list);
2392 count++;
2393 }
2394 }
2395
2396unlock:
2397 rcu_read_unlock();
2398 return count;
2399}
2400EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2401
2402/**
2403 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2404 * @dev: The bridge port providing the bridge on which to check for a querier
2405 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2406 *
2407 * Checks whether the given interface has a bridge on top and if so returns
2408 * true if a valid querier exists anywhere on the bridged link layer.
2409 * Otherwise returns false.
2410 */
2411bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2412{
2413 struct net_bridge *br;
2414 struct net_bridge_port *port;
2415 struct ethhdr eth;
2416 bool ret = false;
2417
2418 rcu_read_lock();
2419 if (!br_port_exists(dev))
2420 goto unlock;
2421
2422 port = br_port_get_rcu(dev);
2423 if (!port || !port->br)
2424 goto unlock;
2425
2426 br = port->br;
2427
2428 memset(ð, 0, sizeof(eth));
2429 eth.h_proto = htons(proto);
2430
2431 ret = br_multicast_querier_exists(br, ð);
2432
2433unlock:
2434 rcu_read_unlock();
2435 return ret;
2436}
2437EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2438
2439/**
2440 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2441 * @dev: The bridge port adjacent to which to check for a querier
2442 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2443 *
2444 * Checks whether the given interface has a bridge on top and if so returns
2445 * true if a selected querier is behind one of the other ports of this
2446 * bridge. Otherwise returns false.
2447 */
2448bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2449{
2450 struct net_bridge *br;
2451 struct net_bridge_port *port;
2452 bool ret = false;
2453
2454 rcu_read_lock();
2455 if (!br_port_exists(dev))
2456 goto unlock;
2457
2458 port = br_port_get_rcu(dev);
2459 if (!port || !port->br)
2460 goto unlock;
2461
2462 br = port->br;
2463
2464 switch (proto) {
2465 case ETH_P_IP:
2466 if (!timer_pending(&br->ip4_other_query.timer) ||
2467 rcu_dereference(br->ip4_querier.port) == port)
2468 goto unlock;
2469 break;
2470#if IS_ENABLED(CONFIG_IPV6)
2471 case ETH_P_IPV6:
2472 if (!timer_pending(&br->ip6_other_query.timer) ||
2473 rcu_dereference(br->ip6_querier.port) == port)
2474 goto unlock;
2475 break;
2476#endif
2477 default:
2478 goto unlock;
2479 }
2480
2481 ret = true;
2482unlock:
2483 rcu_read_unlock();
2484 return ret;
2485}
2486EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2487
2488static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2489 const struct sk_buff *skb, u8 type, u8 dir)
2490{
2491 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2492 __be16 proto = skb->protocol;
2493 unsigned int t_len;
2494
2495 u64_stats_update_begin(&pstats->syncp);
2496 switch (proto) {
2497 case htons(ETH_P_IP):
2498 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2499 switch (type) {
2500 case IGMP_HOST_MEMBERSHIP_REPORT:
2501 pstats->mstats.igmp_v1reports[dir]++;
2502 break;
2503 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2504 pstats->mstats.igmp_v2reports[dir]++;
2505 break;
2506 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2507 pstats->mstats.igmp_v3reports[dir]++;
2508 break;
2509 case IGMP_HOST_MEMBERSHIP_QUERY:
2510 if (t_len != sizeof(struct igmphdr)) {
2511 pstats->mstats.igmp_v3queries[dir]++;
2512 } else {
2513 unsigned int offset = skb_transport_offset(skb);
2514 struct igmphdr *ih, _ihdr;
2515
2516 ih = skb_header_pointer(skb, offset,
2517 sizeof(_ihdr), &_ihdr);
2518 if (!ih)
2519 break;
2520 if (!ih->code)
2521 pstats->mstats.igmp_v1queries[dir]++;
2522 else
2523 pstats->mstats.igmp_v2queries[dir]++;
2524 }
2525 break;
2526 case IGMP_HOST_LEAVE_MESSAGE:
2527 pstats->mstats.igmp_leaves[dir]++;
2528 break;
2529 }
2530 break;
2531#if IS_ENABLED(CONFIG_IPV6)
2532 case htons(ETH_P_IPV6):
2533 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2534 sizeof(struct ipv6hdr);
2535 t_len -= skb_network_header_len(skb);
2536 switch (type) {
2537 case ICMPV6_MGM_REPORT:
2538 pstats->mstats.mld_v1reports[dir]++;
2539 break;
2540 case ICMPV6_MLD2_REPORT:
2541 pstats->mstats.mld_v2reports[dir]++;
2542 break;
2543 case ICMPV6_MGM_QUERY:
2544 if (t_len != sizeof(struct mld_msg))
2545 pstats->mstats.mld_v2queries[dir]++;
2546 else
2547 pstats->mstats.mld_v1queries[dir]++;
2548 break;
2549 case ICMPV6_MGM_REDUCTION:
2550 pstats->mstats.mld_leaves[dir]++;
2551 break;
2552 }
2553 break;
2554#endif /* CONFIG_IPV6 */
2555 }
2556 u64_stats_update_end(&pstats->syncp);
2557}
2558
2559void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2560 const struct sk_buff *skb, u8 type, u8 dir)
2561{
2562 struct bridge_mcast_stats __percpu *stats;
2563
2564 /* if multicast_disabled is true then igmp type can't be set */
2565 if (!type || !br->multicast_stats_enabled)
2566 return;
2567
2568 if (p)
2569 stats = p->mcast_stats;
2570 else
2571 stats = br->mcast_stats;
2572 if (WARN_ON(!stats))
2573 return;
2574
2575 br_mcast_stats_add(stats, skb, type, dir);
2576}
2577
2578int br_multicast_init_stats(struct net_bridge *br)
2579{
2580 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2581 if (!br->mcast_stats)
2582 return -ENOMEM;
2583
2584 return 0;
2585}
2586
2587void br_multicast_uninit_stats(struct net_bridge *br)
2588{
2589 free_percpu(br->mcast_stats);
2590}
2591
2592static void mcast_stats_add_dir(u64 *dst, u64 *src)
2593{
2594 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2595 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2596}
2597
2598void br_multicast_get_stats(const struct net_bridge *br,
2599 const struct net_bridge_port *p,
2600 struct br_mcast_stats *dest)
2601{
2602 struct bridge_mcast_stats __percpu *stats;
2603 struct br_mcast_stats tdst;
2604 int i;
2605
2606 memset(dest, 0, sizeof(*dest));
2607 if (p)
2608 stats = p->mcast_stats;
2609 else
2610 stats = br->mcast_stats;
2611 if (WARN_ON(!stats))
2612 return;
2613
2614 memset(&tdst, 0, sizeof(tdst));
2615 for_each_possible_cpu(i) {
2616 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2617 struct br_mcast_stats temp;
2618 unsigned int start;
2619
2620 do {
2621 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2622 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2623 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2624
2625 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2626 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2627 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2628 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2629 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2630 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2631 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2632 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2633
2634 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2635 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2636 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2637 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2638 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2639 tdst.mld_parse_errors += temp.mld_parse_errors;
2640 }
2641 memcpy(dest, &tdst, sizeof(*dest));
2642}