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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / net / bridge / br_multicast.c
blobcb4729539b82d1b3013b9d6ca60f20ded0062a2d
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
40 static void br_multicast_start_querier(struct net_bridge *br,
41 struct bridge_mcast_own_query *query);
42 static void br_multicast_add_router(struct net_bridge *br,
43 struct net_bridge_port *port);
44 static 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
50 static void __del_port_router(struct net_bridge_port *p);
51 #if IS_ENABLED(CONFIG_IPV6)
52 static 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
57 unsigned int br_mdb_rehash_seq;
58
59 static 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
76 static 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)
83 static 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
92 static 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
106 static 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
119 struct 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
128 static 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)
141 static 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
155 struct 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
186 static 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
197 static 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
226 void 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
234 static 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
242 static 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
265 out:
266 spin_unlock(&br->multicast_lock);
267 }
268
269 static 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
306 static 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
318 out:
319 spin_unlock(&br->multicast_lock);
320 }
321
322 static 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
363 out:
364 rcu_assign_pointer(*mdbp, mdb);
365
366 return 0;
367 }
368
369 static 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
458 out:
459 return skb;
460 }
461
462 #if IS_ENABLED(CONFIG_IPV6)
463 static 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
571 out:
572 return skb;
573 }
574 #endif
575
576 static 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
592 static 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;
630 disable:
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
661 err:
662 mp = ERR_PTR(err);
663 return mp;
664 }
665
666 struct 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:
690 rehash:
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
710 out:
711 return mp;
712 }
713
714 struct 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
742 static 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
755 static 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
800 found:
801 mod_timer(&p->timer, now + br->multicast_membership_interval);
802 out:
803 err = 0;
804
805 err:
806 spin_unlock(&br->multicast_lock);
807 return err;
808 }
809
810 static 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)
829 static 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
848 static 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);
861 out:
862 spin_unlock(&br->multicast_lock);
863 }
864
865 static 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
878 static 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);
889 out:
890 spin_unlock(&br->multicast_lock);
891 }
892
893 static 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
902 out:
903 spin_unlock(&br->multicast_lock);
904 }
905
906 static 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)
914 static 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
922 static 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
934 static 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
960 static 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
997 static void
998 br_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
1013 out:
1014 spin_unlock(&br->multicast_lock);
1015 }
1016
1017 static 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)
1025 static 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
1033 static 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
1045 int 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
1066 void 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
1081 static 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
1090 static 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
1106 void 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
1115 void 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
1136 static 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)
1199 static 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
1271 static 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
1287 update:
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)
1297 static 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
1310 update:
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
1320 static 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
1336 static void
1337 br_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
1347 static 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 */
1365 static 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
1388 static 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
1413 static 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
1426 static 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
1499 out:
1500 spin_unlock(&br->multicast_lock);
1501 return err;
1502 }
1503
1504 #if IS_ENABLED(CONFIG_IPV6)
1505 static 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
1583 out:
1584 spin_unlock(&br->multicast_lock);
1585 return err;
1586 }
1587 #endif
1588
1589 static void
1590 br_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 }
1694 out:
1695 spin_unlock(&br->multicast_lock);
1696 }
1697
1698 static 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)
1721 static 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
1744 static 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
1777 static 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
1792 static 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)
1848 static 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
1901 int 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
1926 static 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
1939 static 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)
1947 static 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
1955 void 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
1998 static 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
2009 void 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
2017 void 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
2028 void 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
2062 out:
2063 spin_unlock_bh(&br->multicast_lock);
2064 }
2065
2066 int 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
2093 static 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
2106 int 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;
2144 unlock:
2145 spin_unlock(&br->multicast_lock);
2146
2147 return err;
2148 }
2149
2150 static 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
2171 int 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;
2193 rollback:
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
2208 unlock:
2209 spin_unlock_bh(&br->multicast_lock);
2210
2211 return err;
2212 }
2213
2214 bool br_multicast_enabled(const struct net_device *dev)
2215 {
2216 struct net_bridge *br = netdev_priv(dev);
2217
2218 return !br->multicast_disabled;
2219 }
2220 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2221
2222 bool 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 }
2232 EXPORT_SYMBOL_GPL(br_multicast_router);
2233
2234 int 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
2262 unlock:
2263 spin_unlock_bh(&br->multicast_lock);
2264
2265 return 0;
2266 }
2267
2268 int 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;
2290 rollback:
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
2301 unlock:
2302 spin_unlock_bh(&br->multicast_lock);
2303
2304 return err;
2305 }
2306
2307 int 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)
2326 int 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 */
2362 int 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
2396 unlock:
2397 rcu_read_unlock();
2398 return count;
2399 }
2400 EXPORT_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 */
2411 bool 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(&eth, 0, sizeof(eth));
2429 eth.h_proto = htons(proto);
2430
2431 ret = br_multicast_querier_exists(br, &eth);
2432
2433 unlock:
2434 rcu_read_unlock();
2435 return ret;
2436 }
2437 EXPORT_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 */
2448 bool 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;
2482 unlock:
2483 rcu_read_unlock();
2484 return ret;
2485 }
2486 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2487
2488 static 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
2559 void 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
2578 int 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
2587 void br_multicast_uninit_stats(struct net_bridge *br)
2588 {
2589 free_percpu(br->mcast_stats);
2590 }
2591
2592 static 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
2598 void 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 }
CRIS linux kernel tree