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Linux 4.14.87
[linux/fpc-iii.git] / net / bridge / br_multicast.c
bloba813dfe2dc2cfe4f36664b27486e17ed9d99e584
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(unsigned long data)
243 {
244 struct net_bridge_mdb_entry *mp = (void *)data;
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->mglist = false;
253
254 if (mp->ports)
255 goto out;
256
257 mdb = mlock_dereference(br->mdb, br);
258
259 hlist_del_rcu(&mp->hlist[mdb->ver]);
260 mdb->size--;
261
262 call_rcu_bh(&mp->rcu, br_multicast_free_group);
263
264 out:
265 spin_unlock(&br->multicast_lock);
266 }
267
268 static void br_multicast_del_pg(struct net_bridge *br,
269 struct net_bridge_port_group *pg)
270 {
271 struct net_bridge_mdb_htable *mdb;
272 struct net_bridge_mdb_entry *mp;
273 struct net_bridge_port_group *p;
274 struct net_bridge_port_group __rcu **pp;
275
276 mdb = mlock_dereference(br->mdb, br);
277
278 mp = br_mdb_ip_get(mdb, &pg->addr);
279 if (WARN_ON(!mp))
280 return;
281
282 for (pp = &mp->ports;
283 (p = mlock_dereference(*pp, br)) != NULL;
284 pp = &p->next) {
285 if (p != pg)
286 continue;
287
288 rcu_assign_pointer(*pp, p->next);
289 hlist_del_init(&p->mglist);
290 del_timer(&p->timer);
291 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
292 p->flags);
293 call_rcu_bh(&p->rcu, br_multicast_free_pg);
294
295 if (!mp->ports && !mp->mglist &&
296 netif_running(br->dev))
297 mod_timer(&mp->timer, jiffies);
298
299 return;
300 }
301
302 WARN_ON(1);
303 }
304
305 static void br_multicast_port_group_expired(unsigned long data)
306 {
307 struct net_bridge_port_group *pg = (void *)data;
308 struct net_bridge *br = pg->port->br;
309
310 spin_lock(&br->multicast_lock);
311 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
312 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
313 goto out;
314
315 br_multicast_del_pg(br, pg);
316
317 out:
318 spin_unlock(&br->multicast_lock);
319 }
320
321 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
322 int elasticity)
323 {
324 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
325 struct net_bridge_mdb_htable *mdb;
326 int err;
327
328 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
329 if (!mdb)
330 return -ENOMEM;
331
332 mdb->max = max;
333 mdb->old = old;
334
335 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
336 if (!mdb->mhash) {
337 kfree(mdb);
338 return -ENOMEM;
339 }
340
341 mdb->size = old ? old->size : 0;
342 mdb->ver = old ? old->ver ^ 1 : 0;
343
344 if (!old || elasticity)
345 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
346 else
347 mdb->secret = old->secret;
348
349 if (!old)
350 goto out;
351
352 err = br_mdb_copy(mdb, old, elasticity);
353 if (err) {
354 kfree(mdb->mhash);
355 kfree(mdb);
356 return err;
357 }
358
359 br_mdb_rehash_seq++;
360 call_rcu_bh(&mdb->rcu, br_mdb_free);
361
362 out:
363 rcu_assign_pointer(*mdbp, mdb);
364
365 return 0;
366 }
367
368 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
369 __be32 group,
370 u8 *igmp_type)
371 {
372 struct igmpv3_query *ihv3;
373 size_t igmp_hdr_size;
374 struct sk_buff *skb;
375 struct igmphdr *ih;
376 struct ethhdr *eth;
377 struct iphdr *iph;
378
379 igmp_hdr_size = sizeof(*ih);
380 if (br->multicast_igmp_version == 3)
381 igmp_hdr_size = sizeof(*ihv3);
382 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
383 igmp_hdr_size + 4);
384 if (!skb)
385 goto out;
386
387 skb->protocol = htons(ETH_P_IP);
388
389 skb_reset_mac_header(skb);
390 eth = eth_hdr(skb);
391
392 ether_addr_copy(eth->h_source, br->dev->dev_addr);
393 eth->h_dest[0] = 1;
394 eth->h_dest[1] = 0;
395 eth->h_dest[2] = 0x5e;
396 eth->h_dest[3] = 0;
397 eth->h_dest[4] = 0;
398 eth->h_dest[5] = 1;
399 eth->h_proto = htons(ETH_P_IP);
400 skb_put(skb, sizeof(*eth));
401
402 skb_set_network_header(skb, skb->len);
403 iph = ip_hdr(skb);
404
405 iph->version = 4;
406 iph->ihl = 6;
407 iph->tos = 0xc0;
408 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
409 iph->id = 0;
410 iph->frag_off = htons(IP_DF);
411 iph->ttl = 1;
412 iph->protocol = IPPROTO_IGMP;
413 iph->saddr = br->multicast_query_use_ifaddr ?
414 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
415 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
416 ((u8 *)&iph[1])[0] = IPOPT_RA;
417 ((u8 *)&iph[1])[1] = 4;
418 ((u8 *)&iph[1])[2] = 0;
419 ((u8 *)&iph[1])[3] = 0;
420 ip_send_check(iph);
421 skb_put(skb, 24);
422
423 skb_set_transport_header(skb, skb->len);
424 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
425
426 switch (br->multicast_igmp_version) {
427 case 2:
428 ih = igmp_hdr(skb);
429 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
430 ih->code = (group ? br->multicast_last_member_interval :
431 br->multicast_query_response_interval) /
432 (HZ / IGMP_TIMER_SCALE);
433 ih->group = group;
434 ih->csum = 0;
435 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
436 break;
437 case 3:
438 ihv3 = igmpv3_query_hdr(skb);
439 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
440 ihv3->code = (group ? br->multicast_last_member_interval :
441 br->multicast_query_response_interval) /
442 (HZ / IGMP_TIMER_SCALE);
443 ihv3->group = group;
444 ihv3->qqic = br->multicast_query_interval / HZ;
445 ihv3->nsrcs = 0;
446 ihv3->resv = 0;
447 ihv3->suppress = 0;
448 ihv3->qrv = 2;
449 ihv3->csum = 0;
450 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
451 break;
452 }
453
454 skb_put(skb, igmp_hdr_size);
455 __skb_pull(skb, sizeof(*eth));
456
457 out:
458 return skb;
459 }
460
461 #if IS_ENABLED(CONFIG_IPV6)
462 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
463 const struct in6_addr *grp,
464 u8 *igmp_type)
465 {
466 struct mld2_query *mld2q;
467 unsigned long interval;
468 struct ipv6hdr *ip6h;
469 struct mld_msg *mldq;
470 size_t mld_hdr_size;
471 struct sk_buff *skb;
472 struct ethhdr *eth;
473 u8 *hopopt;
474
475 mld_hdr_size = sizeof(*mldq);
476 if (br->multicast_mld_version == 2)
477 mld_hdr_size = sizeof(*mld2q);
478 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
479 8 + mld_hdr_size);
480 if (!skb)
481 goto out;
482
483 skb->protocol = htons(ETH_P_IPV6);
484
485 /* Ethernet header */
486 skb_reset_mac_header(skb);
487 eth = eth_hdr(skb);
488
489 ether_addr_copy(eth->h_source, br->dev->dev_addr);
490 eth->h_proto = htons(ETH_P_IPV6);
491 skb_put(skb, sizeof(*eth));
492
493 /* IPv6 header + HbH option */
494 skb_set_network_header(skb, skb->len);
495 ip6h = ipv6_hdr(skb);
496
497 *(__force __be32 *)ip6h = htonl(0x60000000);
498 ip6h->payload_len = htons(8 + mld_hdr_size);
499 ip6h->nexthdr = IPPROTO_HOPOPTS;
500 ip6h->hop_limit = 1;
501 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
502 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
503 &ip6h->saddr)) {
504 kfree_skb(skb);
505 br->has_ipv6_addr = 0;
506 return NULL;
507 }
508
509 br->has_ipv6_addr = 1;
510 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
511
512 hopopt = (u8 *)(ip6h + 1);
513 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
514 hopopt[1] = 0; /* length of HbH */
515 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
516 hopopt[3] = 2; /* Length of RA Option */
517 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
518 hopopt[5] = 0;
519 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
520 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
521
522 skb_put(skb, sizeof(*ip6h) + 8);
523
524 /* ICMPv6 */
525 skb_set_transport_header(skb, skb->len);
526 interval = ipv6_addr_any(grp) ?
527 br->multicast_query_response_interval :
528 br->multicast_last_member_interval;
529 *igmp_type = ICMPV6_MGM_QUERY;
530 switch (br->multicast_mld_version) {
531 case 1:
532 mldq = (struct mld_msg *)icmp6_hdr(skb);
533 mldq->mld_type = ICMPV6_MGM_QUERY;
534 mldq->mld_code = 0;
535 mldq->mld_cksum = 0;
536 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
537 mldq->mld_reserved = 0;
538 mldq->mld_mca = *grp;
539 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
540 sizeof(*mldq), IPPROTO_ICMPV6,
541 csum_partial(mldq,
542 sizeof(*mldq),
543 0));
544 break;
545 case 2:
546 mld2q = (struct mld2_query *)icmp6_hdr(skb);
547 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
548 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
549 mld2q->mld2q_code = 0;
550 mld2q->mld2q_cksum = 0;
551 mld2q->mld2q_resv1 = 0;
552 mld2q->mld2q_resv2 = 0;
553 mld2q->mld2q_suppress = 0;
554 mld2q->mld2q_qrv = 2;
555 mld2q->mld2q_nsrcs = 0;
556 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
557 mld2q->mld2q_mca = *grp;
558 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
559 sizeof(*mld2q),
560 IPPROTO_ICMPV6,
561 csum_partial(mld2q,
562 sizeof(*mld2q),
563 0));
564 break;
565 }
566 skb_put(skb, mld_hdr_size);
567
568 __skb_pull(skb, sizeof(*eth));
569
570 out:
571 return skb;
572 }
573 #endif
574
575 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
576 struct br_ip *addr,
577 u8 *igmp_type)
578 {
579 switch (addr->proto) {
580 case htons(ETH_P_IP):
581 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
582 #if IS_ENABLED(CONFIG_IPV6)
583 case htons(ETH_P_IPV6):
584 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
585 igmp_type);
586 #endif
587 }
588 return NULL;
589 }
590
591 static struct net_bridge_mdb_entry *br_multicast_get_group(
592 struct net_bridge *br, struct net_bridge_port *port,
593 struct br_ip *group, int hash)
594 {
595 struct net_bridge_mdb_htable *mdb;
596 struct net_bridge_mdb_entry *mp;
597 unsigned int count = 0;
598 unsigned int max;
599 int elasticity;
600 int err;
601
602 mdb = rcu_dereference_protected(br->mdb, 1);
603 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
604 count++;
605 if (unlikely(br_ip_equal(group, &mp->addr)))
606 return mp;
607 }
608
609 elasticity = 0;
610 max = mdb->max;
611
612 if (unlikely(count > br->hash_elasticity && count)) {
613 if (net_ratelimit())
614 br_info(br, "Multicast hash table "
615 "chain limit reached: %s\n",
616 port ? port->dev->name : br->dev->name);
617
618 elasticity = br->hash_elasticity;
619 }
620
621 if (mdb->size >= max) {
622 max *= 2;
623 if (unlikely(max > br->hash_max)) {
624 br_warn(br, "Multicast hash table maximum of %d "
625 "reached, disabling snooping: %s\n",
626 br->hash_max,
627 port ? port->dev->name : br->dev->name);
628 err = -E2BIG;
629 disable:
630 br->multicast_disabled = 1;
631 goto err;
632 }
633 }
634
635 if (max > mdb->max || elasticity) {
636 if (mdb->old) {
637 if (net_ratelimit())
638 br_info(br, "Multicast hash table "
639 "on fire: %s\n",
640 port ? port->dev->name : br->dev->name);
641 err = -EEXIST;
642 goto err;
643 }
644
645 err = br_mdb_rehash(&br->mdb, max, elasticity);
646 if (err) {
647 br_warn(br, "Cannot rehash multicast "
648 "hash table, disabling snooping: %s, %d, %d\n",
649 port ? port->dev->name : br->dev->name,
650 mdb->size, err);
651 goto disable;
652 }
653
654 err = -EAGAIN;
655 goto err;
656 }
657
658 return NULL;
659
660 err:
661 mp = ERR_PTR(err);
662 return mp;
663 }
664
665 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
666 struct net_bridge_port *p,
667 struct br_ip *group)
668 {
669 struct net_bridge_mdb_htable *mdb;
670 struct net_bridge_mdb_entry *mp;
671 int hash;
672 int err;
673
674 mdb = rcu_dereference_protected(br->mdb, 1);
675 if (!mdb) {
676 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
677 if (err)
678 return ERR_PTR(err);
679 goto rehash;
680 }
681
682 hash = br_ip_hash(mdb, group);
683 mp = br_multicast_get_group(br, p, group, hash);
684 switch (PTR_ERR(mp)) {
685 case 0:
686 break;
687
688 case -EAGAIN:
689 rehash:
690 mdb = rcu_dereference_protected(br->mdb, 1);
691 hash = br_ip_hash(mdb, group);
692 break;
693
694 default:
695 goto out;
696 }
697
698 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
699 if (unlikely(!mp))
700 return ERR_PTR(-ENOMEM);
701
702 mp->br = br;
703 mp->addr = *group;
704 setup_timer(&mp->timer, br_multicast_group_expired,
705 (unsigned long)mp);
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 setup_timer(&p->timer, br_multicast_port_group_expired,
733 (unsigned long)p);
734
735 if (src)
736 memcpy(p->eth_addr, src, ETH_ALEN);
737 else
738 memset(p->eth_addr, 0xff, ETH_ALEN);
739
740 return p;
741 }
742
743 static bool br_port_group_equal(struct net_bridge_port_group *p,
744 struct net_bridge_port *port,
745 const unsigned char *src)
746 {
747 if (p->port != port)
748 return false;
749
750 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
751 return true;
752
753 return ether_addr_equal(src, p->eth_addr);
754 }
755
756 static int br_multicast_add_group(struct net_bridge *br,
757 struct net_bridge_port *port,
758 struct br_ip *group,
759 const unsigned char *src)
760 {
761 struct net_bridge_port_group __rcu **pp;
762 struct net_bridge_port_group *p;
763 struct net_bridge_mdb_entry *mp;
764 unsigned long now = jiffies;
765 int err;
766
767 spin_lock(&br->multicast_lock);
768 if (!netif_running(br->dev) ||
769 (port && port->state == BR_STATE_DISABLED))
770 goto out;
771
772 mp = br_multicast_new_group(br, port, group);
773 err = PTR_ERR(mp);
774 if (IS_ERR(mp))
775 goto err;
776
777 if (!port) {
778 mp->mglist = true;
779 mod_timer(&mp->timer, now + br->multicast_membership_interval);
780 goto out;
781 }
782
783 for (pp = &mp->ports;
784 (p = mlock_dereference(*pp, br)) != NULL;
785 pp = &p->next) {
786 if (br_port_group_equal(p, port, src))
787 goto found;
788 if ((unsigned long)p->port < (unsigned long)port)
789 break;
790 }
791
792 p = br_multicast_new_port_group(port, group, *pp, 0, src);
793 if (unlikely(!p))
794 goto err;
795 rcu_assign_pointer(*pp, p);
796 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
797
798 found:
799 mod_timer(&p->timer, now + br->multicast_membership_interval);
800 out:
801 err = 0;
802
803 err:
804 spin_unlock(&br->multicast_lock);
805 return err;
806 }
807
808 static int br_ip4_multicast_add_group(struct net_bridge *br,
809 struct net_bridge_port *port,
810 __be32 group,
811 __u16 vid,
812 const unsigned char *src)
813 {
814 struct br_ip br_group;
815
816 if (ipv4_is_local_multicast(group))
817 return 0;
818
819 br_group.u.ip4 = group;
820 br_group.proto = htons(ETH_P_IP);
821 br_group.vid = vid;
822
823 return br_multicast_add_group(br, port, &br_group, src);
824 }
825
826 #if IS_ENABLED(CONFIG_IPV6)
827 static int br_ip6_multicast_add_group(struct net_bridge *br,
828 struct net_bridge_port *port,
829 const struct in6_addr *group,
830 __u16 vid,
831 const unsigned char *src)
832 {
833 struct br_ip br_group;
834
835 if (ipv6_addr_is_ll_all_nodes(group))
836 return 0;
837
838 br_group.u.ip6 = *group;
839 br_group.proto = htons(ETH_P_IPV6);
840 br_group.vid = vid;
841
842 return br_multicast_add_group(br, port, &br_group, src);
843 }
844 #endif
845
846 static void br_multicast_router_expired(unsigned long data)
847 {
848 struct net_bridge_port *port = (void *)data;
849 struct net_bridge *br = port->br;
850
851 spin_lock(&br->multicast_lock);
852 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
853 port->multicast_router == MDB_RTR_TYPE_PERM ||
854 timer_pending(&port->multicast_router_timer))
855 goto out;
856
857 __del_port_router(port);
858 out:
859 spin_unlock(&br->multicast_lock);
860 }
861
862 static void br_multicast_local_router_expired(unsigned long data)
863 {
864 }
865
866 static void br_multicast_querier_expired(struct net_bridge *br,
867 struct bridge_mcast_own_query *query)
868 {
869 spin_lock(&br->multicast_lock);
870 if (!netif_running(br->dev) || br->multicast_disabled)
871 goto out;
872
873 br_multicast_start_querier(br, query);
874
875 out:
876 spin_unlock(&br->multicast_lock);
877 }
878
879 static void br_ip4_multicast_querier_expired(unsigned long data)
880 {
881 struct net_bridge *br = (void *)data;
882
883 br_multicast_querier_expired(br, &br->ip4_own_query);
884 }
885
886 #if IS_ENABLED(CONFIG_IPV6)
887 static void br_ip6_multicast_querier_expired(unsigned long data)
888 {
889 struct net_bridge *br = (void *)data;
890
891 br_multicast_querier_expired(br, &br->ip6_own_query);
892 }
893 #endif
894
895 static void br_multicast_select_own_querier(struct net_bridge *br,
896 struct br_ip *ip,
897 struct sk_buff *skb)
898 {
899 if (ip->proto == htons(ETH_P_IP))
900 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
901 #if IS_ENABLED(CONFIG_IPV6)
902 else
903 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
904 #endif
905 }
906
907 static void __br_multicast_send_query(struct net_bridge *br,
908 struct net_bridge_port *port,
909 struct br_ip *ip)
910 {
911 struct sk_buff *skb;
912 u8 igmp_type;
913
914 skb = br_multicast_alloc_query(br, ip, &igmp_type);
915 if (!skb)
916 return;
917
918 if (port) {
919 skb->dev = port->dev;
920 br_multicast_count(br, port, skb, igmp_type,
921 BR_MCAST_DIR_TX);
922 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
923 dev_net(port->dev), NULL, skb, NULL, skb->dev,
924 br_dev_queue_push_xmit);
925 } else {
926 br_multicast_select_own_querier(br, ip, skb);
927 br_multicast_count(br, port, skb, igmp_type,
928 BR_MCAST_DIR_RX);
929 netif_rx(skb);
930 }
931 }
932
933 static void br_multicast_send_query(struct net_bridge *br,
934 struct net_bridge_port *port,
935 struct bridge_mcast_own_query *own_query)
936 {
937 struct bridge_mcast_other_query *other_query = NULL;
938 struct br_ip br_group;
939 unsigned long time;
940
941 if (!netif_running(br->dev) || br->multicast_disabled ||
942 !br->multicast_querier)
943 return;
944
945 memset(&br_group.u, 0, sizeof(br_group.u));
946
947 if (port ? (own_query == &port->ip4_own_query) :
948 (own_query == &br->ip4_own_query)) {
949 other_query = &br->ip4_other_query;
950 br_group.proto = htons(ETH_P_IP);
951 #if IS_ENABLED(CONFIG_IPV6)
952 } else {
953 other_query = &br->ip6_other_query;
954 br_group.proto = htons(ETH_P_IPV6);
955 #endif
956 }
957
958 if (!other_query || timer_pending(&other_query->timer))
959 return;
960
961 __br_multicast_send_query(br, port, &br_group);
962
963 time = jiffies;
964 time += own_query->startup_sent < br->multicast_startup_query_count ?
965 br->multicast_startup_query_interval :
966 br->multicast_query_interval;
967 mod_timer(&own_query->timer, time);
968 }
969
970 static void
971 br_multicast_port_query_expired(struct net_bridge_port *port,
972 struct bridge_mcast_own_query *query)
973 {
974 struct net_bridge *br = port->br;
975
976 spin_lock(&br->multicast_lock);
977 if (port->state == BR_STATE_DISABLED ||
978 port->state == BR_STATE_BLOCKING)
979 goto out;
980
981 if (query->startup_sent < br->multicast_startup_query_count)
982 query->startup_sent++;
983
984 br_multicast_send_query(port->br, port, query);
985
986 out:
987 spin_unlock(&br->multicast_lock);
988 }
989
990 static void br_ip4_multicast_port_query_expired(unsigned long data)
991 {
992 struct net_bridge_port *port = (void *)data;
993
994 br_multicast_port_query_expired(port, &port->ip4_own_query);
995 }
996
997 #if IS_ENABLED(CONFIG_IPV6)
998 static void br_ip6_multicast_port_query_expired(unsigned long data)
999 {
1000 struct net_bridge_port *port = (void *)data;
1001
1002 br_multicast_port_query_expired(port, &port->ip6_own_query);
1003 }
1004 #endif
1005
1006 static void br_mc_disabled_update(struct net_device *dev, bool value)
1007 {
1008 struct switchdev_attr attr = {
1009 .orig_dev = dev,
1010 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1011 .flags = SWITCHDEV_F_DEFER,
1012 .u.mc_disabled = value,
1013 };
1014
1015 switchdev_port_attr_set(dev, &attr);
1016 }
1017
1018 int br_multicast_add_port(struct net_bridge_port *port)
1019 {
1020 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1021
1022 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
1023 (unsigned long)port);
1024 setup_timer(&port->ip4_own_query.timer,
1025 br_ip4_multicast_port_query_expired, (unsigned long)port);
1026 #if IS_ENABLED(CONFIG_IPV6)
1027 setup_timer(&port->ip6_own_query.timer,
1028 br_ip6_multicast_port_query_expired, (unsigned long)port);
1029 #endif
1030 br_mc_disabled_update(port->dev, port->br->multicast_disabled);
1031
1032 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1033 if (!port->mcast_stats)
1034 return -ENOMEM;
1035
1036 return 0;
1037 }
1038
1039 void br_multicast_del_port(struct net_bridge_port *port)
1040 {
1041 struct net_bridge *br = port->br;
1042 struct net_bridge_port_group *pg;
1043 struct hlist_node *n;
1044
1045 /* Take care of the remaining groups, only perm ones should be left */
1046 spin_lock_bh(&br->multicast_lock);
1047 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1048 br_multicast_del_pg(br, pg);
1049 spin_unlock_bh(&br->multicast_lock);
1050 del_timer_sync(&port->multicast_router_timer);
1051 free_percpu(port->mcast_stats);
1052 }
1053
1054 static void br_multicast_enable(struct bridge_mcast_own_query *query)
1055 {
1056 query->startup_sent = 0;
1057
1058 if (try_to_del_timer_sync(&query->timer) >= 0 ||
1059 del_timer(&query->timer))
1060 mod_timer(&query->timer, jiffies);
1061 }
1062
1063 static void __br_multicast_enable_port(struct net_bridge_port *port)
1064 {
1065 struct net_bridge *br = port->br;
1066
1067 if (br->multicast_disabled || !netif_running(br->dev))
1068 return;
1069
1070 br_multicast_enable(&port->ip4_own_query);
1071 #if IS_ENABLED(CONFIG_IPV6)
1072 br_multicast_enable(&port->ip6_own_query);
1073 #endif
1074 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1075 hlist_unhashed(&port->rlist))
1076 br_multicast_add_router(br, port);
1077 }
1078
1079 void br_multicast_enable_port(struct net_bridge_port *port)
1080 {
1081 struct net_bridge *br = port->br;
1082
1083 spin_lock(&br->multicast_lock);
1084 __br_multicast_enable_port(port);
1085 spin_unlock(&br->multicast_lock);
1086 }
1087
1088 void br_multicast_disable_port(struct net_bridge_port *port)
1089 {
1090 struct net_bridge *br = port->br;
1091 struct net_bridge_port_group *pg;
1092 struct hlist_node *n;
1093
1094 spin_lock(&br->multicast_lock);
1095 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1096 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1097 br_multicast_del_pg(br, pg);
1098
1099 __del_port_router(port);
1100
1101 del_timer(&port->multicast_router_timer);
1102 del_timer(&port->ip4_own_query.timer);
1103 #if IS_ENABLED(CONFIG_IPV6)
1104 del_timer(&port->ip6_own_query.timer);
1105 #endif
1106 spin_unlock(&br->multicast_lock);
1107 }
1108
1109 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1110 struct net_bridge_port *port,
1111 struct sk_buff *skb,
1112 u16 vid)
1113 {
1114 const unsigned char *src;
1115 struct igmpv3_report *ih;
1116 struct igmpv3_grec *grec;
1117 int i;
1118 int len;
1119 int num;
1120 int type;
1121 int err = 0;
1122 __be32 group;
1123
1124 ih = igmpv3_report_hdr(skb);
1125 num = ntohs(ih->ngrec);
1126 len = skb_transport_offset(skb) + sizeof(*ih);
1127
1128 for (i = 0; i < num; i++) {
1129 len += sizeof(*grec);
1130 if (!pskb_may_pull(skb, len))
1131 return -EINVAL;
1132
1133 grec = (void *)(skb->data + len - sizeof(*grec));
1134 group = grec->grec_mca;
1135 type = grec->grec_type;
1136
1137 len += ntohs(grec->grec_nsrcs) * 4;
1138 if (!pskb_may_pull(skb, len))
1139 return -EINVAL;
1140
1141 /* We treat this as an IGMPv2 report for now. */
1142 switch (type) {
1143 case IGMPV3_MODE_IS_INCLUDE:
1144 case IGMPV3_MODE_IS_EXCLUDE:
1145 case IGMPV3_CHANGE_TO_INCLUDE:
1146 case IGMPV3_CHANGE_TO_EXCLUDE:
1147 case IGMPV3_ALLOW_NEW_SOURCES:
1148 case IGMPV3_BLOCK_OLD_SOURCES:
1149 break;
1150
1151 default:
1152 continue;
1153 }
1154
1155 src = eth_hdr(skb)->h_source;
1156 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1157 type == IGMPV3_MODE_IS_INCLUDE) &&
1158 ntohs(grec->grec_nsrcs) == 0) {
1159 br_ip4_multicast_leave_group(br, port, group, vid, src);
1160 } else {
1161 err = br_ip4_multicast_add_group(br, port, group, vid,
1162 src);
1163 if (err)
1164 break;
1165 }
1166 }
1167
1168 return err;
1169 }
1170
1171 #if IS_ENABLED(CONFIG_IPV6)
1172 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1173 struct net_bridge_port *port,
1174 struct sk_buff *skb,
1175 u16 vid)
1176 {
1177 const unsigned char *src;
1178 struct icmp6hdr *icmp6h;
1179 struct mld2_grec *grec;
1180 int i;
1181 int len;
1182 int num;
1183 int err = 0;
1184
1185 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1186 return -EINVAL;
1187
1188 icmp6h = icmp6_hdr(skb);
1189 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1190 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1191
1192 for (i = 0; i < num; i++) {
1193 __be16 *nsrcs, _nsrcs;
1194
1195 nsrcs = skb_header_pointer(skb,
1196 len + offsetof(struct mld2_grec,
1197 grec_nsrcs),
1198 sizeof(_nsrcs), &_nsrcs);
1199 if (!nsrcs)
1200 return -EINVAL;
1201
1202 if (!pskb_may_pull(skb,
1203 len + sizeof(*grec) +
1204 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1205 return -EINVAL;
1206
1207 grec = (struct mld2_grec *)(skb->data + len);
1208 len += sizeof(*grec) +
1209 sizeof(struct in6_addr) * ntohs(*nsrcs);
1210
1211 /* We treat these as MLDv1 reports for now. */
1212 switch (grec->grec_type) {
1213 case MLD2_MODE_IS_INCLUDE:
1214 case MLD2_MODE_IS_EXCLUDE:
1215 case MLD2_CHANGE_TO_INCLUDE:
1216 case MLD2_CHANGE_TO_EXCLUDE:
1217 case MLD2_ALLOW_NEW_SOURCES:
1218 case MLD2_BLOCK_OLD_SOURCES:
1219 break;
1220
1221 default:
1222 continue;
1223 }
1224
1225 src = eth_hdr(skb)->h_source;
1226 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1227 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1228 ntohs(*nsrcs) == 0) {
1229 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1230 vid, src);
1231 } else {
1232 err = br_ip6_multicast_add_group(br, port,
1233 &grec->grec_mca, vid,
1234 src);
1235 if (err)
1236 break;
1237 }
1238 }
1239
1240 return err;
1241 }
1242 #endif
1243
1244 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1245 struct net_bridge_port *port,
1246 __be32 saddr)
1247 {
1248 if (!timer_pending(&br->ip4_own_query.timer) &&
1249 !timer_pending(&br->ip4_other_query.timer))
1250 goto update;
1251
1252 if (!br->ip4_querier.addr.u.ip4)
1253 goto update;
1254
1255 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1256 goto update;
1257
1258 return false;
1259
1260 update:
1261 br->ip4_querier.addr.u.ip4 = saddr;
1262
1263 /* update protected by general multicast_lock by caller */
1264 rcu_assign_pointer(br->ip4_querier.port, port);
1265
1266 return true;
1267 }
1268
1269 #if IS_ENABLED(CONFIG_IPV6)
1270 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1271 struct net_bridge_port *port,
1272 struct in6_addr *saddr)
1273 {
1274 if (!timer_pending(&br->ip6_own_query.timer) &&
1275 !timer_pending(&br->ip6_other_query.timer))
1276 goto update;
1277
1278 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1279 goto update;
1280
1281 return false;
1282
1283 update:
1284 br->ip6_querier.addr.u.ip6 = *saddr;
1285
1286 /* update protected by general multicast_lock by caller */
1287 rcu_assign_pointer(br->ip6_querier.port, port);
1288
1289 return true;
1290 }
1291 #endif
1292
1293 static bool br_multicast_select_querier(struct net_bridge *br,
1294 struct net_bridge_port *port,
1295 struct br_ip *saddr)
1296 {
1297 switch (saddr->proto) {
1298 case htons(ETH_P_IP):
1299 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1300 #if IS_ENABLED(CONFIG_IPV6)
1301 case htons(ETH_P_IPV6):
1302 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1303 #endif
1304 }
1305
1306 return false;
1307 }
1308
1309 static void
1310 br_multicast_update_query_timer(struct net_bridge *br,
1311 struct bridge_mcast_other_query *query,
1312 unsigned long max_delay)
1313 {
1314 if (!timer_pending(&query->timer))
1315 query->delay_time = jiffies + max_delay;
1316
1317 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1318 }
1319
1320 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1321 bool is_mc_router)
1322 {
1323 struct switchdev_attr attr = {
1324 .orig_dev = p->dev,
1325 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1326 .flags = SWITCHDEV_F_DEFER,
1327 .u.mrouter = is_mc_router,
1328 };
1329
1330 switchdev_port_attr_set(p->dev, &attr);
1331 }
1332
1333 /*
1334 * Add port to router_list
1335 * list is maintained ordered by pointer value
1336 * and locked by br->multicast_lock and RCU
1337 */
1338 static void br_multicast_add_router(struct net_bridge *br,
1339 struct net_bridge_port *port)
1340 {
1341 struct net_bridge_port *p;
1342 struct hlist_node *slot = NULL;
1343
1344 if (!hlist_unhashed(&port->rlist))
1345 return;
1346
1347 hlist_for_each_entry(p, &br->router_list, rlist) {
1348 if ((unsigned long) port >= (unsigned long) p)
1349 break;
1350 slot = &p->rlist;
1351 }
1352
1353 if (slot)
1354 hlist_add_behind_rcu(&port->rlist, slot);
1355 else
1356 hlist_add_head_rcu(&port->rlist, &br->router_list);
1357 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1358 br_port_mc_router_state_change(port, true);
1359 }
1360
1361 static void br_multicast_mark_router(struct net_bridge *br,
1362 struct net_bridge_port *port)
1363 {
1364 unsigned long now = jiffies;
1365
1366 if (!port) {
1367 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1368 mod_timer(&br->multicast_router_timer,
1369 now + br->multicast_querier_interval);
1370 return;
1371 }
1372
1373 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1374 port->multicast_router == MDB_RTR_TYPE_PERM)
1375 return;
1376
1377 br_multicast_add_router(br, port);
1378
1379 mod_timer(&port->multicast_router_timer,
1380 now + br->multicast_querier_interval);
1381 }
1382
1383 static void br_multicast_query_received(struct net_bridge *br,
1384 struct net_bridge_port *port,
1385 struct bridge_mcast_other_query *query,
1386 struct br_ip *saddr,
1387 unsigned long max_delay)
1388 {
1389 if (!br_multicast_select_querier(br, port, saddr))
1390 return;
1391
1392 br_multicast_update_query_timer(br, query, max_delay);
1393
1394 /* Based on RFC4541, section 2.1.1 IGMP Forwarding Rules,
1395 * the arrival port for IGMP Queries where the source address
1396 * is 0.0.0.0 should not be added to router port list.
1397 */
1398 if ((saddr->proto == htons(ETH_P_IP) && saddr->u.ip4) ||
1399 saddr->proto == htons(ETH_P_IPV6))
1400 br_multicast_mark_router(br, port);
1401 }
1402
1403 static int br_ip4_multicast_query(struct net_bridge *br,
1404 struct net_bridge_port *port,
1405 struct sk_buff *skb,
1406 u16 vid)
1407 {
1408 const struct iphdr *iph = ip_hdr(skb);
1409 struct igmphdr *ih = igmp_hdr(skb);
1410 struct net_bridge_mdb_entry *mp;
1411 struct igmpv3_query *ih3;
1412 struct net_bridge_port_group *p;
1413 struct net_bridge_port_group __rcu **pp;
1414 struct br_ip saddr;
1415 unsigned long max_delay;
1416 unsigned long now = jiffies;
1417 unsigned int offset = skb_transport_offset(skb);
1418 __be32 group;
1419 int err = 0;
1420
1421 spin_lock(&br->multicast_lock);
1422 if (!netif_running(br->dev) ||
1423 (port && port->state == BR_STATE_DISABLED))
1424 goto out;
1425
1426 group = ih->group;
1427
1428 if (skb->len == offset + sizeof(*ih)) {
1429 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1430
1431 if (!max_delay) {
1432 max_delay = 10 * HZ;
1433 group = 0;
1434 }
1435 } else if (skb->len >= offset + sizeof(*ih3)) {
1436 ih3 = igmpv3_query_hdr(skb);
1437 if (ih3->nsrcs)
1438 goto out;
1439
1440 max_delay = ih3->code ?
1441 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1442 } else {
1443 goto out;
1444 }
1445
1446 if (!group) {
1447 saddr.proto = htons(ETH_P_IP);
1448 saddr.u.ip4 = iph->saddr;
1449
1450 br_multicast_query_received(br, port, &br->ip4_other_query,
1451 &saddr, max_delay);
1452 goto out;
1453 }
1454
1455 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1456 if (!mp)
1457 goto out;
1458
1459 max_delay *= br->multicast_last_member_count;
1460
1461 if (mp->mglist &&
1462 (timer_pending(&mp->timer) ?
1463 time_after(mp->timer.expires, now + max_delay) :
1464 try_to_del_timer_sync(&mp->timer) >= 0))
1465 mod_timer(&mp->timer, now + max_delay);
1466
1467 for (pp = &mp->ports;
1468 (p = mlock_dereference(*pp, br)) != NULL;
1469 pp = &p->next) {
1470 if (timer_pending(&p->timer) ?
1471 time_after(p->timer.expires, now + max_delay) :
1472 try_to_del_timer_sync(&p->timer) >= 0)
1473 mod_timer(&p->timer, now + max_delay);
1474 }
1475
1476 out:
1477 spin_unlock(&br->multicast_lock);
1478 return err;
1479 }
1480
1481 #if IS_ENABLED(CONFIG_IPV6)
1482 static int br_ip6_multicast_query(struct net_bridge *br,
1483 struct net_bridge_port *port,
1484 struct sk_buff *skb,
1485 u16 vid)
1486 {
1487 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1488 struct mld_msg *mld;
1489 struct net_bridge_mdb_entry *mp;
1490 struct mld2_query *mld2q;
1491 struct net_bridge_port_group *p;
1492 struct net_bridge_port_group __rcu **pp;
1493 struct br_ip saddr;
1494 unsigned long max_delay;
1495 unsigned long now = jiffies;
1496 unsigned int offset = skb_transport_offset(skb);
1497 const struct in6_addr *group = NULL;
1498 bool is_general_query;
1499 int err = 0;
1500
1501 spin_lock(&br->multicast_lock);
1502 if (!netif_running(br->dev) ||
1503 (port && port->state == BR_STATE_DISABLED))
1504 goto out;
1505
1506 if (skb->len == offset + sizeof(*mld)) {
1507 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1508 err = -EINVAL;
1509 goto out;
1510 }
1511 mld = (struct mld_msg *) icmp6_hdr(skb);
1512 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1513 if (max_delay)
1514 group = &mld->mld_mca;
1515 } else {
1516 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1517 err = -EINVAL;
1518 goto out;
1519 }
1520 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1521 if (!mld2q->mld2q_nsrcs)
1522 group = &mld2q->mld2q_mca;
1523
1524 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1525 }
1526
1527 is_general_query = group && ipv6_addr_any(group);
1528
1529 if (is_general_query) {
1530 saddr.proto = htons(ETH_P_IPV6);
1531 saddr.u.ip6 = ip6h->saddr;
1532
1533 br_multicast_query_received(br, port, &br->ip6_other_query,
1534 &saddr, max_delay);
1535 goto out;
1536 } else if (!group) {
1537 goto out;
1538 }
1539
1540 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1541 if (!mp)
1542 goto out;
1543
1544 max_delay *= br->multicast_last_member_count;
1545 if (mp->mglist &&
1546 (timer_pending(&mp->timer) ?
1547 time_after(mp->timer.expires, now + max_delay) :
1548 try_to_del_timer_sync(&mp->timer) >= 0))
1549 mod_timer(&mp->timer, now + max_delay);
1550
1551 for (pp = &mp->ports;
1552 (p = mlock_dereference(*pp, br)) != NULL;
1553 pp = &p->next) {
1554 if (timer_pending(&p->timer) ?
1555 time_after(p->timer.expires, now + max_delay) :
1556 try_to_del_timer_sync(&p->timer) >= 0)
1557 mod_timer(&p->timer, now + max_delay);
1558 }
1559
1560 out:
1561 spin_unlock(&br->multicast_lock);
1562 return err;
1563 }
1564 #endif
1565
1566 static void
1567 br_multicast_leave_group(struct net_bridge *br,
1568 struct net_bridge_port *port,
1569 struct br_ip *group,
1570 struct bridge_mcast_other_query *other_query,
1571 struct bridge_mcast_own_query *own_query,
1572 const unsigned char *src)
1573 {
1574 struct net_bridge_mdb_htable *mdb;
1575 struct net_bridge_mdb_entry *mp;
1576 struct net_bridge_port_group *p;
1577 unsigned long now;
1578 unsigned long time;
1579
1580 spin_lock(&br->multicast_lock);
1581 if (!netif_running(br->dev) ||
1582 (port && port->state == BR_STATE_DISABLED))
1583 goto out;
1584
1585 mdb = mlock_dereference(br->mdb, br);
1586 mp = br_mdb_ip_get(mdb, group);
1587 if (!mp)
1588 goto out;
1589
1590 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1591 struct net_bridge_port_group __rcu **pp;
1592
1593 for (pp = &mp->ports;
1594 (p = mlock_dereference(*pp, br)) != NULL;
1595 pp = &p->next) {
1596 if (!br_port_group_equal(p, port, src))
1597 continue;
1598
1599 rcu_assign_pointer(*pp, p->next);
1600 hlist_del_init(&p->mglist);
1601 del_timer(&p->timer);
1602 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1603 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1604 p->flags);
1605
1606 if (!mp->ports && !mp->mglist &&
1607 netif_running(br->dev))
1608 mod_timer(&mp->timer, jiffies);
1609 }
1610 goto out;
1611 }
1612
1613 if (timer_pending(&other_query->timer))
1614 goto out;
1615
1616 if (br->multicast_querier) {
1617 __br_multicast_send_query(br, port, &mp->addr);
1618
1619 time = jiffies + br->multicast_last_member_count *
1620 br->multicast_last_member_interval;
1621
1622 mod_timer(&own_query->timer, time);
1623
1624 for (p = mlock_dereference(mp->ports, br);
1625 p != NULL;
1626 p = mlock_dereference(p->next, br)) {
1627 if (!br_port_group_equal(p, port, src))
1628 continue;
1629
1630 if (!hlist_unhashed(&p->mglist) &&
1631 (timer_pending(&p->timer) ?
1632 time_after(p->timer.expires, time) :
1633 try_to_del_timer_sync(&p->timer) >= 0)) {
1634 mod_timer(&p->timer, time);
1635 }
1636
1637 break;
1638 }
1639 }
1640
1641 now = jiffies;
1642 time = now + br->multicast_last_member_count *
1643 br->multicast_last_member_interval;
1644
1645 if (!port) {
1646 if (mp->mglist &&
1647 (timer_pending(&mp->timer) ?
1648 time_after(mp->timer.expires, time) :
1649 try_to_del_timer_sync(&mp->timer) >= 0)) {
1650 mod_timer(&mp->timer, time);
1651 }
1652
1653 goto out;
1654 }
1655
1656 for (p = mlock_dereference(mp->ports, br);
1657 p != NULL;
1658 p = mlock_dereference(p->next, br)) {
1659 if (p->port != port)
1660 continue;
1661
1662 if (!hlist_unhashed(&p->mglist) &&
1663 (timer_pending(&p->timer) ?
1664 time_after(p->timer.expires, time) :
1665 try_to_del_timer_sync(&p->timer) >= 0)) {
1666 mod_timer(&p->timer, time);
1667 }
1668
1669 break;
1670 }
1671 out:
1672 spin_unlock(&br->multicast_lock);
1673 }
1674
1675 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1676 struct net_bridge_port *port,
1677 __be32 group,
1678 __u16 vid,
1679 const unsigned char *src)
1680 {
1681 struct br_ip br_group;
1682 struct bridge_mcast_own_query *own_query;
1683
1684 if (ipv4_is_local_multicast(group))
1685 return;
1686
1687 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1688
1689 br_group.u.ip4 = group;
1690 br_group.proto = htons(ETH_P_IP);
1691 br_group.vid = vid;
1692
1693 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1694 own_query, src);
1695 }
1696
1697 #if IS_ENABLED(CONFIG_IPV6)
1698 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1699 struct net_bridge_port *port,
1700 const struct in6_addr *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 (ipv6_addr_is_ll_all_nodes(group))
1708 return;
1709
1710 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1711
1712 br_group.u.ip6 = *group;
1713 br_group.proto = htons(ETH_P_IPV6);
1714 br_group.vid = vid;
1715
1716 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1717 own_query, src);
1718 }
1719 #endif
1720
1721 static void br_multicast_err_count(const struct net_bridge *br,
1722 const struct net_bridge_port *p,
1723 __be16 proto)
1724 {
1725 struct bridge_mcast_stats __percpu *stats;
1726 struct bridge_mcast_stats *pstats;
1727
1728 if (!br->multicast_stats_enabled)
1729 return;
1730
1731 if (p)
1732 stats = p->mcast_stats;
1733 else
1734 stats = br->mcast_stats;
1735 if (WARN_ON(!stats))
1736 return;
1737
1738 pstats = this_cpu_ptr(stats);
1739
1740 u64_stats_update_begin(&pstats->syncp);
1741 switch (proto) {
1742 case htons(ETH_P_IP):
1743 pstats->mstats.igmp_parse_errors++;
1744 break;
1745 #if IS_ENABLED(CONFIG_IPV6)
1746 case htons(ETH_P_IPV6):
1747 pstats->mstats.mld_parse_errors++;
1748 break;
1749 #endif
1750 }
1751 u64_stats_update_end(&pstats->syncp);
1752 }
1753
1754 static void br_multicast_pim(struct net_bridge *br,
1755 struct net_bridge_port *port,
1756 const struct sk_buff *skb)
1757 {
1758 unsigned int offset = skb_transport_offset(skb);
1759 struct pimhdr *pimhdr, _pimhdr;
1760
1761 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1762 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1763 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1764 return;
1765
1766 br_multicast_mark_router(br, port);
1767 }
1768
1769 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1770 struct net_bridge_port *port,
1771 struct sk_buff *skb,
1772 u16 vid)
1773 {
1774 struct sk_buff *skb_trimmed = NULL;
1775 const unsigned char *src;
1776 struct igmphdr *ih;
1777 int err;
1778
1779 err = ip_mc_check_igmp(skb, &skb_trimmed);
1780
1781 if (err == -ENOMSG) {
1782 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1783 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1784 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1785 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1786 br_multicast_pim(br, port, skb);
1787 }
1788 return 0;
1789 } else if (err < 0) {
1790 br_multicast_err_count(br, port, skb->protocol);
1791 return err;
1792 }
1793
1794 ih = igmp_hdr(skb);
1795 src = eth_hdr(skb)->h_source;
1796 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1797
1798 switch (ih->type) {
1799 case IGMP_HOST_MEMBERSHIP_REPORT:
1800 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1801 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1802 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1803 break;
1804 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1805 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1806 break;
1807 case IGMP_HOST_MEMBERSHIP_QUERY:
1808 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1809 break;
1810 case IGMP_HOST_LEAVE_MESSAGE:
1811 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1812 break;
1813 }
1814
1815 if (skb_trimmed && skb_trimmed != skb)
1816 kfree_skb(skb_trimmed);
1817
1818 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1819 BR_MCAST_DIR_RX);
1820
1821 return err;
1822 }
1823
1824 #if IS_ENABLED(CONFIG_IPV6)
1825 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1826 struct net_bridge_port *port,
1827 struct sk_buff *skb,
1828 u16 vid)
1829 {
1830 struct sk_buff *skb_trimmed = NULL;
1831 const unsigned char *src;
1832 struct mld_msg *mld;
1833 int err;
1834
1835 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1836
1837 if (err == -ENOMSG) {
1838 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1839 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1840 return 0;
1841 } else if (err < 0) {
1842 br_multicast_err_count(br, port, skb->protocol);
1843 return err;
1844 }
1845
1846 mld = (struct mld_msg *)skb_transport_header(skb);
1847 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1848
1849 switch (mld->mld_type) {
1850 case ICMPV6_MGM_REPORT:
1851 src = eth_hdr(skb)->h_source;
1852 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1853 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1854 src);
1855 break;
1856 case ICMPV6_MLD2_REPORT:
1857 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1858 break;
1859 case ICMPV6_MGM_QUERY:
1860 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1861 break;
1862 case ICMPV6_MGM_REDUCTION:
1863 src = eth_hdr(skb)->h_source;
1864 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1865 break;
1866 }
1867
1868 if (skb_trimmed && skb_trimmed != skb)
1869 kfree_skb(skb_trimmed);
1870
1871 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1872 BR_MCAST_DIR_RX);
1873
1874 return err;
1875 }
1876 #endif
1877
1878 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1879 struct sk_buff *skb, u16 vid)
1880 {
1881 int ret = 0;
1882
1883 BR_INPUT_SKB_CB(skb)->igmp = 0;
1884 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1885
1886 if (br->multicast_disabled)
1887 return 0;
1888
1889 switch (skb->protocol) {
1890 case htons(ETH_P_IP):
1891 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1892 break;
1893 #if IS_ENABLED(CONFIG_IPV6)
1894 case htons(ETH_P_IPV6):
1895 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1896 break;
1897 #endif
1898 }
1899
1900 return ret;
1901 }
1902
1903 static void br_multicast_query_expired(struct net_bridge *br,
1904 struct bridge_mcast_own_query *query,
1905 struct bridge_mcast_querier *querier)
1906 {
1907 spin_lock(&br->multicast_lock);
1908 if (query->startup_sent < br->multicast_startup_query_count)
1909 query->startup_sent++;
1910
1911 RCU_INIT_POINTER(querier->port, NULL);
1912 br_multicast_send_query(br, NULL, query);
1913 spin_unlock(&br->multicast_lock);
1914 }
1915
1916 static void br_ip4_multicast_query_expired(unsigned long data)
1917 {
1918 struct net_bridge *br = (void *)data;
1919
1920 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1921 }
1922
1923 #if IS_ENABLED(CONFIG_IPV6)
1924 static void br_ip6_multicast_query_expired(unsigned long data)
1925 {
1926 struct net_bridge *br = (void *)data;
1927
1928 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1929 }
1930 #endif
1931
1932 void br_multicast_init(struct net_bridge *br)
1933 {
1934 br->hash_elasticity = 4;
1935 br->hash_max = 512;
1936
1937 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1938 br->multicast_querier = 0;
1939 br->multicast_query_use_ifaddr = 0;
1940 br->multicast_last_member_count = 2;
1941 br->multicast_startup_query_count = 2;
1942
1943 br->multicast_last_member_interval = HZ;
1944 br->multicast_query_response_interval = 10 * HZ;
1945 br->multicast_startup_query_interval = 125 * HZ / 4;
1946 br->multicast_query_interval = 125 * HZ;
1947 br->multicast_querier_interval = 255 * HZ;
1948 br->multicast_membership_interval = 260 * HZ;
1949
1950 br->ip4_other_query.delay_time = 0;
1951 br->ip4_querier.port = NULL;
1952 br->multicast_igmp_version = 2;
1953 #if IS_ENABLED(CONFIG_IPV6)
1954 br->multicast_mld_version = 1;
1955 br->ip6_other_query.delay_time = 0;
1956 br->ip6_querier.port = NULL;
1957 #endif
1958 br->has_ipv6_addr = 1;
1959
1960 spin_lock_init(&br->multicast_lock);
1961 setup_timer(&br->multicast_router_timer,
1962 br_multicast_local_router_expired, 0);
1963 setup_timer(&br->ip4_other_query.timer,
1964 br_ip4_multicast_querier_expired, (unsigned long)br);
1965 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1966 (unsigned long)br);
1967 #if IS_ENABLED(CONFIG_IPV6)
1968 setup_timer(&br->ip6_other_query.timer,
1969 br_ip6_multicast_querier_expired, (unsigned long)br);
1970 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1971 (unsigned long)br);
1972 #endif
1973 }
1974
1975 static void __br_multicast_open(struct net_bridge *br,
1976 struct bridge_mcast_own_query *query)
1977 {
1978 query->startup_sent = 0;
1979
1980 if (br->multicast_disabled)
1981 return;
1982
1983 mod_timer(&query->timer, jiffies);
1984 }
1985
1986 void br_multicast_open(struct net_bridge *br)
1987 {
1988 __br_multicast_open(br, &br->ip4_own_query);
1989 #if IS_ENABLED(CONFIG_IPV6)
1990 __br_multicast_open(br, &br->ip6_own_query);
1991 #endif
1992 }
1993
1994 void br_multicast_stop(struct net_bridge *br)
1995 {
1996 del_timer_sync(&br->multicast_router_timer);
1997 del_timer_sync(&br->ip4_other_query.timer);
1998 del_timer_sync(&br->ip4_own_query.timer);
1999 #if IS_ENABLED(CONFIG_IPV6)
2000 del_timer_sync(&br->ip6_other_query.timer);
2001 del_timer_sync(&br->ip6_own_query.timer);
2002 #endif
2003 }
2004
2005 void br_multicast_dev_del(struct net_bridge *br)
2006 {
2007 struct net_bridge_mdb_htable *mdb;
2008 struct net_bridge_mdb_entry *mp;
2009 struct hlist_node *n;
2010 u32 ver;
2011 int i;
2012
2013 spin_lock_bh(&br->multicast_lock);
2014 mdb = mlock_dereference(br->mdb, br);
2015 if (!mdb)
2016 goto out;
2017
2018 br->mdb = NULL;
2019
2020 ver = mdb->ver;
2021 for (i = 0; i < mdb->max; i++) {
2022 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
2023 hlist[ver]) {
2024 del_timer(&mp->timer);
2025 call_rcu_bh(&mp->rcu, br_multicast_free_group);
2026 }
2027 }
2028
2029 if (mdb->old) {
2030 spin_unlock_bh(&br->multicast_lock);
2031 rcu_barrier_bh();
2032 spin_lock_bh(&br->multicast_lock);
2033 WARN_ON(mdb->old);
2034 }
2035
2036 mdb->old = mdb;
2037 call_rcu_bh(&mdb->rcu, br_mdb_free);
2038
2039 out:
2040 spin_unlock_bh(&br->multicast_lock);
2041 }
2042
2043 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2044 {
2045 int err = -EINVAL;
2046
2047 spin_lock_bh(&br->multicast_lock);
2048
2049 switch (val) {
2050 case MDB_RTR_TYPE_DISABLED:
2051 case MDB_RTR_TYPE_PERM:
2052 del_timer(&br->multicast_router_timer);
2053 /* fall through */
2054 case MDB_RTR_TYPE_TEMP_QUERY:
2055 br->multicast_router = val;
2056 err = 0;
2057 break;
2058 }
2059
2060 spin_unlock_bh(&br->multicast_lock);
2061
2062 return err;
2063 }
2064
2065 static void __del_port_router(struct net_bridge_port *p)
2066 {
2067 if (hlist_unhashed(&p->rlist))
2068 return;
2069 hlist_del_init_rcu(&p->rlist);
2070 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2071 br_port_mc_router_state_change(p, false);
2072
2073 /* don't allow timer refresh */
2074 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2075 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2076 }
2077
2078 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2079 {
2080 struct net_bridge *br = p->br;
2081 unsigned long now = jiffies;
2082 int err = -EINVAL;
2083
2084 spin_lock(&br->multicast_lock);
2085 if (p->multicast_router == val) {
2086 /* Refresh the temp router port timer */
2087 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2088 mod_timer(&p->multicast_router_timer,
2089 now + br->multicast_querier_interval);
2090 err = 0;
2091 goto unlock;
2092 }
2093 switch (val) {
2094 case MDB_RTR_TYPE_DISABLED:
2095 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2096 __del_port_router(p);
2097 del_timer(&p->multicast_router_timer);
2098 break;
2099 case MDB_RTR_TYPE_TEMP_QUERY:
2100 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2101 __del_port_router(p);
2102 break;
2103 case MDB_RTR_TYPE_PERM:
2104 p->multicast_router = MDB_RTR_TYPE_PERM;
2105 del_timer(&p->multicast_router_timer);
2106 br_multicast_add_router(br, p);
2107 break;
2108 case MDB_RTR_TYPE_TEMP:
2109 p->multicast_router = MDB_RTR_TYPE_TEMP;
2110 br_multicast_mark_router(br, p);
2111 break;
2112 default:
2113 goto unlock;
2114 }
2115 err = 0;
2116 unlock:
2117 spin_unlock(&br->multicast_lock);
2118
2119 return err;
2120 }
2121
2122 static void br_multicast_start_querier(struct net_bridge *br,
2123 struct bridge_mcast_own_query *query)
2124 {
2125 struct net_bridge_port *port;
2126
2127 __br_multicast_open(br, query);
2128
2129 list_for_each_entry(port, &br->port_list, list) {
2130 if (port->state == BR_STATE_DISABLED ||
2131 port->state == BR_STATE_BLOCKING)
2132 continue;
2133
2134 if (query == &br->ip4_own_query)
2135 br_multicast_enable(&port->ip4_own_query);
2136 #if IS_ENABLED(CONFIG_IPV6)
2137 else
2138 br_multicast_enable(&port->ip6_own_query);
2139 #endif
2140 }
2141 }
2142
2143 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2144 {
2145 struct net_bridge_mdb_htable *mdb;
2146 struct net_bridge_port *port;
2147 int err = 0;
2148
2149 spin_lock_bh(&br->multicast_lock);
2150 if (br->multicast_disabled == !val)
2151 goto unlock;
2152
2153 br_mc_disabled_update(br->dev, !val);
2154 br->multicast_disabled = !val;
2155 if (br->multicast_disabled)
2156 goto unlock;
2157
2158 if (!netif_running(br->dev))
2159 goto unlock;
2160
2161 mdb = mlock_dereference(br->mdb, br);
2162 if (mdb) {
2163 if (mdb->old) {
2164 err = -EEXIST;
2165 rollback:
2166 br->multicast_disabled = !!val;
2167 goto unlock;
2168 }
2169
2170 err = br_mdb_rehash(&br->mdb, mdb->max,
2171 br->hash_elasticity);
2172 if (err)
2173 goto rollback;
2174 }
2175
2176 br_multicast_open(br);
2177 list_for_each_entry(port, &br->port_list, list)
2178 __br_multicast_enable_port(port);
2179
2180 unlock:
2181 spin_unlock_bh(&br->multicast_lock);
2182
2183 return err;
2184 }
2185
2186 bool br_multicast_enabled(const struct net_device *dev)
2187 {
2188 struct net_bridge *br = netdev_priv(dev);
2189
2190 return !br->multicast_disabled;
2191 }
2192 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2193
2194 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2195 {
2196 unsigned long max_delay;
2197
2198 val = !!val;
2199
2200 spin_lock_bh(&br->multicast_lock);
2201 if (br->multicast_querier == val)
2202 goto unlock;
2203
2204 br->multicast_querier = val;
2205 if (!val)
2206 goto unlock;
2207
2208 max_delay = br->multicast_query_response_interval;
2209
2210 if (!timer_pending(&br->ip4_other_query.timer))
2211 br->ip4_other_query.delay_time = jiffies + max_delay;
2212
2213 br_multicast_start_querier(br, &br->ip4_own_query);
2214
2215 #if IS_ENABLED(CONFIG_IPV6)
2216 if (!timer_pending(&br->ip6_other_query.timer))
2217 br->ip6_other_query.delay_time = jiffies + max_delay;
2218
2219 br_multicast_start_querier(br, &br->ip6_own_query);
2220 #endif
2221
2222 unlock:
2223 spin_unlock_bh(&br->multicast_lock);
2224
2225 return 0;
2226 }
2227
2228 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2229 {
2230 int err = -EINVAL;
2231 u32 old;
2232 struct net_bridge_mdb_htable *mdb;
2233
2234 spin_lock_bh(&br->multicast_lock);
2235 if (!is_power_of_2(val))
2236 goto unlock;
2237
2238 mdb = mlock_dereference(br->mdb, br);
2239 if (mdb && val < mdb->size)
2240 goto unlock;
2241
2242 err = 0;
2243
2244 old = br->hash_max;
2245 br->hash_max = val;
2246
2247 if (mdb) {
2248 if (mdb->old) {
2249 err = -EEXIST;
2250 rollback:
2251 br->hash_max = old;
2252 goto unlock;
2253 }
2254
2255 err = br_mdb_rehash(&br->mdb, br->hash_max,
2256 br->hash_elasticity);
2257 if (err)
2258 goto rollback;
2259 }
2260
2261 unlock:
2262 spin_unlock_bh(&br->multicast_lock);
2263
2264 return err;
2265 }
2266
2267 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2268 {
2269 /* Currently we support only version 2 and 3 */
2270 switch (val) {
2271 case 2:
2272 case 3:
2273 break;
2274 default:
2275 return -EINVAL;
2276 }
2277
2278 spin_lock_bh(&br->multicast_lock);
2279 br->multicast_igmp_version = val;
2280 spin_unlock_bh(&br->multicast_lock);
2281
2282 return 0;
2283 }
2284
2285 #if IS_ENABLED(CONFIG_IPV6)
2286 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2287 {
2288 /* Currently we support version 1 and 2 */
2289 switch (val) {
2290 case 1:
2291 case 2:
2292 break;
2293 default:
2294 return -EINVAL;
2295 }
2296
2297 spin_lock_bh(&br->multicast_lock);
2298 br->multicast_mld_version = val;
2299 spin_unlock_bh(&br->multicast_lock);
2300
2301 return 0;
2302 }
2303 #endif
2304
2305 /**
2306 * br_multicast_list_adjacent - Returns snooped multicast addresses
2307 * @dev: The bridge port adjacent to which to retrieve addresses
2308 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2309 *
2310 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2311 * snooping feature on all bridge ports of dev's bridge device, excluding
2312 * the addresses from dev itself.
2313 *
2314 * Returns the number of items added to br_ip_list.
2315 *
2316 * Notes:
2317 * - br_ip_list needs to be initialized by caller
2318 * - br_ip_list might contain duplicates in the end
2319 * (needs to be taken care of by caller)
2320 * - br_ip_list needs to be freed by caller
2321 */
2322 int br_multicast_list_adjacent(struct net_device *dev,
2323 struct list_head *br_ip_list)
2324 {
2325 struct net_bridge *br;
2326 struct net_bridge_port *port;
2327 struct net_bridge_port_group *group;
2328 struct br_ip_list *entry;
2329 int count = 0;
2330
2331 rcu_read_lock();
2332 if (!br_ip_list || !br_port_exists(dev))
2333 goto unlock;
2334
2335 port = br_port_get_rcu(dev);
2336 if (!port || !port->br)
2337 goto unlock;
2338
2339 br = port->br;
2340
2341 list_for_each_entry_rcu(port, &br->port_list, list) {
2342 if (!port->dev || port->dev == dev)
2343 continue;
2344
2345 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2346 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2347 if (!entry)
2348 goto unlock;
2349
2350 entry->addr = group->addr;
2351 list_add(&entry->list, br_ip_list);
2352 count++;
2353 }
2354 }
2355
2356 unlock:
2357 rcu_read_unlock();
2358 return count;
2359 }
2360 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2361
2362 /**
2363 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2364 * @dev: The bridge port providing the bridge on which to check for a querier
2365 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2366 *
2367 * Checks whether the given interface has a bridge on top and if so returns
2368 * true if a valid querier exists anywhere on the bridged link layer.
2369 * Otherwise returns false.
2370 */
2371 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2372 {
2373 struct net_bridge *br;
2374 struct net_bridge_port *port;
2375 struct ethhdr eth;
2376 bool ret = false;
2377
2378 rcu_read_lock();
2379 if (!br_port_exists(dev))
2380 goto unlock;
2381
2382 port = br_port_get_rcu(dev);
2383 if (!port || !port->br)
2384 goto unlock;
2385
2386 br = port->br;
2387
2388 memset(&eth, 0, sizeof(eth));
2389 eth.h_proto = htons(proto);
2390
2391 ret = br_multicast_querier_exists(br, &eth);
2392
2393 unlock:
2394 rcu_read_unlock();
2395 return ret;
2396 }
2397 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2398
2399 /**
2400 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2401 * @dev: The bridge port adjacent to which to check for a querier
2402 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2403 *
2404 * Checks whether the given interface has a bridge on top and if so returns
2405 * true if a selected querier is behind one of the other ports of this
2406 * bridge. Otherwise returns false.
2407 */
2408 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2409 {
2410 struct net_bridge *br;
2411 struct net_bridge_port *port;
2412 bool ret = false;
2413
2414 rcu_read_lock();
2415 if (!br_port_exists(dev))
2416 goto unlock;
2417
2418 port = br_port_get_rcu(dev);
2419 if (!port || !port->br)
2420 goto unlock;
2421
2422 br = port->br;
2423
2424 switch (proto) {
2425 case ETH_P_IP:
2426 if (!timer_pending(&br->ip4_other_query.timer) ||
2427 rcu_dereference(br->ip4_querier.port) == port)
2428 goto unlock;
2429 break;
2430 #if IS_ENABLED(CONFIG_IPV6)
2431 case ETH_P_IPV6:
2432 if (!timer_pending(&br->ip6_other_query.timer) ||
2433 rcu_dereference(br->ip6_querier.port) == port)
2434 goto unlock;
2435 break;
2436 #endif
2437 default:
2438 goto unlock;
2439 }
2440
2441 ret = true;
2442 unlock:
2443 rcu_read_unlock();
2444 return ret;
2445 }
2446 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2447
2448 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2449 const struct sk_buff *skb, u8 type, u8 dir)
2450 {
2451 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2452 __be16 proto = skb->protocol;
2453 unsigned int t_len;
2454
2455 u64_stats_update_begin(&pstats->syncp);
2456 switch (proto) {
2457 case htons(ETH_P_IP):
2458 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2459 switch (type) {
2460 case IGMP_HOST_MEMBERSHIP_REPORT:
2461 pstats->mstats.igmp_v1reports[dir]++;
2462 break;
2463 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2464 pstats->mstats.igmp_v2reports[dir]++;
2465 break;
2466 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2467 pstats->mstats.igmp_v3reports[dir]++;
2468 break;
2469 case IGMP_HOST_MEMBERSHIP_QUERY:
2470 if (t_len != sizeof(struct igmphdr)) {
2471 pstats->mstats.igmp_v3queries[dir]++;
2472 } else {
2473 unsigned int offset = skb_transport_offset(skb);
2474 struct igmphdr *ih, _ihdr;
2475
2476 ih = skb_header_pointer(skb, offset,
2477 sizeof(_ihdr), &_ihdr);
2478 if (!ih)
2479 break;
2480 if (!ih->code)
2481 pstats->mstats.igmp_v1queries[dir]++;
2482 else
2483 pstats->mstats.igmp_v2queries[dir]++;
2484 }
2485 break;
2486 case IGMP_HOST_LEAVE_MESSAGE:
2487 pstats->mstats.igmp_leaves[dir]++;
2488 break;
2489 }
2490 break;
2491 #if IS_ENABLED(CONFIG_IPV6)
2492 case htons(ETH_P_IPV6):
2493 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2494 sizeof(struct ipv6hdr);
2495 t_len -= skb_network_header_len(skb);
2496 switch (type) {
2497 case ICMPV6_MGM_REPORT:
2498 pstats->mstats.mld_v1reports[dir]++;
2499 break;
2500 case ICMPV6_MLD2_REPORT:
2501 pstats->mstats.mld_v2reports[dir]++;
2502 break;
2503 case ICMPV6_MGM_QUERY:
2504 if (t_len != sizeof(struct mld_msg))
2505 pstats->mstats.mld_v2queries[dir]++;
2506 else
2507 pstats->mstats.mld_v1queries[dir]++;
2508 break;
2509 case ICMPV6_MGM_REDUCTION:
2510 pstats->mstats.mld_leaves[dir]++;
2511 break;
2512 }
2513 break;
2514 #endif /* CONFIG_IPV6 */
2515 }
2516 u64_stats_update_end(&pstats->syncp);
2517 }
2518
2519 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2520 const struct sk_buff *skb, u8 type, u8 dir)
2521 {
2522 struct bridge_mcast_stats __percpu *stats;
2523
2524 /* if multicast_disabled is true then igmp type can't be set */
2525 if (!type || !br->multicast_stats_enabled)
2526 return;
2527
2528 if (p)
2529 stats = p->mcast_stats;
2530 else
2531 stats = br->mcast_stats;
2532 if (WARN_ON(!stats))
2533 return;
2534
2535 br_mcast_stats_add(stats, skb, type, dir);
2536 }
2537
2538 int br_multicast_init_stats(struct net_bridge *br)
2539 {
2540 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2541 if (!br->mcast_stats)
2542 return -ENOMEM;
2543
2544 return 0;
2545 }
2546
2547 void br_multicast_uninit_stats(struct net_bridge *br)
2548 {
2549 free_percpu(br->mcast_stats);
2550 }
2551
2552 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2553 {
2554 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2555 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2556 }
2557
2558 void br_multicast_get_stats(const struct net_bridge *br,
2559 const struct net_bridge_port *p,
2560 struct br_mcast_stats *dest)
2561 {
2562 struct bridge_mcast_stats __percpu *stats;
2563 struct br_mcast_stats tdst;
2564 int i;
2565
2566 memset(dest, 0, sizeof(*dest));
2567 if (p)
2568 stats = p->mcast_stats;
2569 else
2570 stats = br->mcast_stats;
2571 if (WARN_ON(!stats))
2572 return;
2573
2574 memset(&tdst, 0, sizeof(tdst));
2575 for_each_possible_cpu(i) {
2576 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2577 struct br_mcast_stats temp;
2578 unsigned int start;
2579
2580 do {
2581 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2582 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2583 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2584
2585 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2586 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2587 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2588 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2589 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2590 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2591 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2592 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2593
2594 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2595 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2596 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2597 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2598 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2599 tdst.mld_parse_errors += temp.mld_parse_errors;
2600 }
2601 memcpy(dest, &tdst, sizeof(*dest));
2602 }
Linux with added FPC-III support