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[mirror_ubuntu-bionic-kernel.git] / net / bridge / br_multicast.c
1 /*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13 #include <linux/err.h>
14 #include <linux/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 br_multicast_mark_router(br, port);
1394 }
1395
1396 static int br_ip4_multicast_query(struct net_bridge *br,
1397 struct net_bridge_port *port,
1398 struct sk_buff *skb,
1399 u16 vid)
1400 {
1401 const struct iphdr *iph = ip_hdr(skb);
1402 struct igmphdr *ih = igmp_hdr(skb);
1403 struct net_bridge_mdb_entry *mp;
1404 struct igmpv3_query *ih3;
1405 struct net_bridge_port_group *p;
1406 struct net_bridge_port_group __rcu **pp;
1407 struct br_ip saddr;
1408 unsigned long max_delay;
1409 unsigned long now = jiffies;
1410 unsigned int offset = skb_transport_offset(skb);
1411 __be32 group;
1412 int err = 0;
1413
1414 spin_lock(&br->multicast_lock);
1415 if (!netif_running(br->dev) ||
1416 (port && port->state == BR_STATE_DISABLED))
1417 goto out;
1418
1419 group = ih->group;
1420
1421 if (skb->len == offset + sizeof(*ih)) {
1422 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1423
1424 if (!max_delay) {
1425 max_delay = 10 * HZ;
1426 group = 0;
1427 }
1428 } else if (skb->len >= offset + sizeof(*ih3)) {
1429 ih3 = igmpv3_query_hdr(skb);
1430 if (ih3->nsrcs)
1431 goto out;
1432
1433 max_delay = ih3->code ?
1434 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1435 } else {
1436 goto out;
1437 }
1438
1439 if (!group) {
1440 saddr.proto = htons(ETH_P_IP);
1441 saddr.u.ip4 = iph->saddr;
1442
1443 br_multicast_query_received(br, port, &br->ip4_other_query,
1444 &saddr, max_delay);
1445 goto out;
1446 }
1447
1448 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1449 if (!mp)
1450 goto out;
1451
1452 max_delay *= br->multicast_last_member_count;
1453
1454 if (mp->mglist &&
1455 (timer_pending(&mp->timer) ?
1456 time_after(mp->timer.expires, now + max_delay) :
1457 try_to_del_timer_sync(&mp->timer) >= 0))
1458 mod_timer(&mp->timer, now + max_delay);
1459
1460 for (pp = &mp->ports;
1461 (p = mlock_dereference(*pp, br)) != NULL;
1462 pp = &p->next) {
1463 if (timer_pending(&p->timer) ?
1464 time_after(p->timer.expires, now + max_delay) :
1465 try_to_del_timer_sync(&p->timer) >= 0)
1466 mod_timer(&p->timer, now + max_delay);
1467 }
1468
1469 out:
1470 spin_unlock(&br->multicast_lock);
1471 return err;
1472 }
1473
1474 #if IS_ENABLED(CONFIG_IPV6)
1475 static int br_ip6_multicast_query(struct net_bridge *br,
1476 struct net_bridge_port *port,
1477 struct sk_buff *skb,
1478 u16 vid)
1479 {
1480 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1481 struct mld_msg *mld;
1482 struct net_bridge_mdb_entry *mp;
1483 struct mld2_query *mld2q;
1484 struct net_bridge_port_group *p;
1485 struct net_bridge_port_group __rcu **pp;
1486 struct br_ip saddr;
1487 unsigned long max_delay;
1488 unsigned long now = jiffies;
1489 unsigned int offset = skb_transport_offset(skb);
1490 const struct in6_addr *group = NULL;
1491 bool is_general_query;
1492 int err = 0;
1493
1494 spin_lock(&br->multicast_lock);
1495 if (!netif_running(br->dev) ||
1496 (port && port->state == BR_STATE_DISABLED))
1497 goto out;
1498
1499 if (skb->len == offset + sizeof(*mld)) {
1500 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1501 err = -EINVAL;
1502 goto out;
1503 }
1504 mld = (struct mld_msg *) icmp6_hdr(skb);
1505 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1506 if (max_delay)
1507 group = &mld->mld_mca;
1508 } else {
1509 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1510 err = -EINVAL;
1511 goto out;
1512 }
1513 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1514 if (!mld2q->mld2q_nsrcs)
1515 group = &mld2q->mld2q_mca;
1516
1517 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1518 }
1519
1520 is_general_query = group && ipv6_addr_any(group);
1521
1522 if (is_general_query) {
1523 saddr.proto = htons(ETH_P_IPV6);
1524 saddr.u.ip6 = ip6h->saddr;
1525
1526 br_multicast_query_received(br, port, &br->ip6_other_query,
1527 &saddr, max_delay);
1528 goto out;
1529 } else if (!group) {
1530 goto out;
1531 }
1532
1533 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1534 if (!mp)
1535 goto out;
1536
1537 max_delay *= br->multicast_last_member_count;
1538 if (mp->mglist &&
1539 (timer_pending(&mp->timer) ?
1540 time_after(mp->timer.expires, now + max_delay) :
1541 try_to_del_timer_sync(&mp->timer) >= 0))
1542 mod_timer(&mp->timer, now + max_delay);
1543
1544 for (pp = &mp->ports;
1545 (p = mlock_dereference(*pp, br)) != NULL;
1546 pp = &p->next) {
1547 if (timer_pending(&p->timer) ?
1548 time_after(p->timer.expires, now + max_delay) :
1549 try_to_del_timer_sync(&p->timer) >= 0)
1550 mod_timer(&p->timer, now + max_delay);
1551 }
1552
1553 out:
1554 spin_unlock(&br->multicast_lock);
1555 return err;
1556 }
1557 #endif
1558
1559 static void
1560 br_multicast_leave_group(struct net_bridge *br,
1561 struct net_bridge_port *port,
1562 struct br_ip *group,
1563 struct bridge_mcast_other_query *other_query,
1564 struct bridge_mcast_own_query *own_query,
1565 const unsigned char *src)
1566 {
1567 struct net_bridge_mdb_htable *mdb;
1568 struct net_bridge_mdb_entry *mp;
1569 struct net_bridge_port_group *p;
1570 unsigned long now;
1571 unsigned long time;
1572
1573 spin_lock(&br->multicast_lock);
1574 if (!netif_running(br->dev) ||
1575 (port && port->state == BR_STATE_DISABLED))
1576 goto out;
1577
1578 mdb = mlock_dereference(br->mdb, br);
1579 mp = br_mdb_ip_get(mdb, group);
1580 if (!mp)
1581 goto out;
1582
1583 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1584 struct net_bridge_port_group __rcu **pp;
1585
1586 for (pp = &mp->ports;
1587 (p = mlock_dereference(*pp, br)) != NULL;
1588 pp = &p->next) {
1589 if (!br_port_group_equal(p, port, src))
1590 continue;
1591
1592 rcu_assign_pointer(*pp, p->next);
1593 hlist_del_init(&p->mglist);
1594 del_timer(&p->timer);
1595 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1596 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1597 p->flags);
1598
1599 if (!mp->ports && !mp->mglist &&
1600 netif_running(br->dev))
1601 mod_timer(&mp->timer, jiffies);
1602 }
1603 goto out;
1604 }
1605
1606 if (timer_pending(&other_query->timer))
1607 goto out;
1608
1609 if (br->multicast_querier) {
1610 __br_multicast_send_query(br, port, &mp->addr);
1611
1612 time = jiffies + br->multicast_last_member_count *
1613 br->multicast_last_member_interval;
1614
1615 mod_timer(&own_query->timer, time);
1616
1617 for (p = mlock_dereference(mp->ports, br);
1618 p != NULL;
1619 p = mlock_dereference(p->next, br)) {
1620 if (!br_port_group_equal(p, port, src))
1621 continue;
1622
1623 if (!hlist_unhashed(&p->mglist) &&
1624 (timer_pending(&p->timer) ?
1625 time_after(p->timer.expires, time) :
1626 try_to_del_timer_sync(&p->timer) >= 0)) {
1627 mod_timer(&p->timer, time);
1628 }
1629
1630 break;
1631 }
1632 }
1633
1634 now = jiffies;
1635 time = now + br->multicast_last_member_count *
1636 br->multicast_last_member_interval;
1637
1638 if (!port) {
1639 if (mp->mglist &&
1640 (timer_pending(&mp->timer) ?
1641 time_after(mp->timer.expires, time) :
1642 try_to_del_timer_sync(&mp->timer) >= 0)) {
1643 mod_timer(&mp->timer, time);
1644 }
1645
1646 goto out;
1647 }
1648
1649 for (p = mlock_dereference(mp->ports, br);
1650 p != NULL;
1651 p = mlock_dereference(p->next, br)) {
1652 if (p->port != port)
1653 continue;
1654
1655 if (!hlist_unhashed(&p->mglist) &&
1656 (timer_pending(&p->timer) ?
1657 time_after(p->timer.expires, time) :
1658 try_to_del_timer_sync(&p->timer) >= 0)) {
1659 mod_timer(&p->timer, time);
1660 }
1661
1662 break;
1663 }
1664 out:
1665 spin_unlock(&br->multicast_lock);
1666 }
1667
1668 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1669 struct net_bridge_port *port,
1670 __be32 group,
1671 __u16 vid,
1672 const unsigned char *src)
1673 {
1674 struct br_ip br_group;
1675 struct bridge_mcast_own_query *own_query;
1676
1677 if (ipv4_is_local_multicast(group))
1678 return;
1679
1680 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1681
1682 br_group.u.ip4 = group;
1683 br_group.proto = htons(ETH_P_IP);
1684 br_group.vid = vid;
1685
1686 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1687 own_query, src);
1688 }
1689
1690 #if IS_ENABLED(CONFIG_IPV6)
1691 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1692 struct net_bridge_port *port,
1693 const struct in6_addr *group,
1694 __u16 vid,
1695 const unsigned char *src)
1696 {
1697 struct br_ip br_group;
1698 struct bridge_mcast_own_query *own_query;
1699
1700 if (ipv6_addr_is_ll_all_nodes(group))
1701 return;
1702
1703 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1704
1705 br_group.u.ip6 = *group;
1706 br_group.proto = htons(ETH_P_IPV6);
1707 br_group.vid = vid;
1708
1709 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1710 own_query, src);
1711 }
1712 #endif
1713
1714 static void br_multicast_err_count(const struct net_bridge *br,
1715 const struct net_bridge_port *p,
1716 __be16 proto)
1717 {
1718 struct bridge_mcast_stats __percpu *stats;
1719 struct bridge_mcast_stats *pstats;
1720
1721 if (!br->multicast_stats_enabled)
1722 return;
1723
1724 if (p)
1725 stats = p->mcast_stats;
1726 else
1727 stats = br->mcast_stats;
1728 if (WARN_ON(!stats))
1729 return;
1730
1731 pstats = this_cpu_ptr(stats);
1732
1733 u64_stats_update_begin(&pstats->syncp);
1734 switch (proto) {
1735 case htons(ETH_P_IP):
1736 pstats->mstats.igmp_parse_errors++;
1737 break;
1738 #if IS_ENABLED(CONFIG_IPV6)
1739 case htons(ETH_P_IPV6):
1740 pstats->mstats.mld_parse_errors++;
1741 break;
1742 #endif
1743 }
1744 u64_stats_update_end(&pstats->syncp);
1745 }
1746
1747 static void br_multicast_pim(struct net_bridge *br,
1748 struct net_bridge_port *port,
1749 const struct sk_buff *skb)
1750 {
1751 unsigned int offset = skb_transport_offset(skb);
1752 struct pimhdr *pimhdr, _pimhdr;
1753
1754 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1755 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1756 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1757 return;
1758
1759 br_multicast_mark_router(br, port);
1760 }
1761
1762 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1763 struct net_bridge_port *port,
1764 struct sk_buff *skb,
1765 u16 vid)
1766 {
1767 struct sk_buff *skb_trimmed = NULL;
1768 const unsigned char *src;
1769 struct igmphdr *ih;
1770 int err;
1771
1772 err = ip_mc_check_igmp(skb, &skb_trimmed);
1773
1774 if (err == -ENOMSG) {
1775 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1776 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1777 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1778 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1779 br_multicast_pim(br, port, skb);
1780 }
1781 return 0;
1782 } else if (err < 0) {
1783 br_multicast_err_count(br, port, skb->protocol);
1784 return err;
1785 }
1786
1787 ih = igmp_hdr(skb);
1788 src = eth_hdr(skb)->h_source;
1789 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1790
1791 switch (ih->type) {
1792 case IGMP_HOST_MEMBERSHIP_REPORT:
1793 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1794 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1795 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1796 break;
1797 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1798 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1799 break;
1800 case IGMP_HOST_MEMBERSHIP_QUERY:
1801 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1802 break;
1803 case IGMP_HOST_LEAVE_MESSAGE:
1804 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1805 break;
1806 }
1807
1808 if (skb_trimmed && skb_trimmed != skb)
1809 kfree_skb(skb_trimmed);
1810
1811 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1812 BR_MCAST_DIR_RX);
1813
1814 return err;
1815 }
1816
1817 #if IS_ENABLED(CONFIG_IPV6)
1818 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1819 struct net_bridge_port *port,
1820 struct sk_buff *skb,
1821 u16 vid)
1822 {
1823 struct sk_buff *skb_trimmed = NULL;
1824 const unsigned char *src;
1825 struct mld_msg *mld;
1826 int err;
1827
1828 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1829
1830 if (err == -ENOMSG) {
1831 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1832 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1833 return 0;
1834 } else if (err < 0) {
1835 br_multicast_err_count(br, port, skb->protocol);
1836 return err;
1837 }
1838
1839 mld = (struct mld_msg *)skb_transport_header(skb);
1840 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1841
1842 switch (mld->mld_type) {
1843 case ICMPV6_MGM_REPORT:
1844 src = eth_hdr(skb)->h_source;
1845 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1846 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1847 src);
1848 break;
1849 case ICMPV6_MLD2_REPORT:
1850 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1851 break;
1852 case ICMPV6_MGM_QUERY:
1853 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1854 break;
1855 case ICMPV6_MGM_REDUCTION:
1856 src = eth_hdr(skb)->h_source;
1857 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1858 break;
1859 }
1860
1861 if (skb_trimmed && skb_trimmed != skb)
1862 kfree_skb(skb_trimmed);
1863
1864 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1865 BR_MCAST_DIR_RX);
1866
1867 return err;
1868 }
1869 #endif
1870
1871 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1872 struct sk_buff *skb, u16 vid)
1873 {
1874 int ret = 0;
1875
1876 BR_INPUT_SKB_CB(skb)->igmp = 0;
1877 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1878
1879 if (br->multicast_disabled)
1880 return 0;
1881
1882 switch (skb->protocol) {
1883 case htons(ETH_P_IP):
1884 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1885 break;
1886 #if IS_ENABLED(CONFIG_IPV6)
1887 case htons(ETH_P_IPV6):
1888 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1889 break;
1890 #endif
1891 }
1892
1893 return ret;
1894 }
1895
1896 static void br_multicast_query_expired(struct net_bridge *br,
1897 struct bridge_mcast_own_query *query,
1898 struct bridge_mcast_querier *querier)
1899 {
1900 spin_lock(&br->multicast_lock);
1901 if (query->startup_sent < br->multicast_startup_query_count)
1902 query->startup_sent++;
1903
1904 RCU_INIT_POINTER(querier->port, NULL);
1905 br_multicast_send_query(br, NULL, query);
1906 spin_unlock(&br->multicast_lock);
1907 }
1908
1909 static void br_ip4_multicast_query_expired(unsigned long data)
1910 {
1911 struct net_bridge *br = (void *)data;
1912
1913 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1914 }
1915
1916 #if IS_ENABLED(CONFIG_IPV6)
1917 static void br_ip6_multicast_query_expired(unsigned long data)
1918 {
1919 struct net_bridge *br = (void *)data;
1920
1921 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1922 }
1923 #endif
1924
1925 void br_multicast_init(struct net_bridge *br)
1926 {
1927 br->hash_elasticity = 4;
1928 br->hash_max = 512;
1929
1930 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1931 br->multicast_querier = 0;
1932 br->multicast_query_use_ifaddr = 0;
1933 br->multicast_last_member_count = 2;
1934 br->multicast_startup_query_count = 2;
1935
1936 br->multicast_last_member_interval = HZ;
1937 br->multicast_query_response_interval = 10 * HZ;
1938 br->multicast_startup_query_interval = 125 * HZ / 4;
1939 br->multicast_query_interval = 125 * HZ;
1940 br->multicast_querier_interval = 255 * HZ;
1941 br->multicast_membership_interval = 260 * HZ;
1942
1943 br->ip4_other_query.delay_time = 0;
1944 br->ip4_querier.port = NULL;
1945 br->multicast_igmp_version = 2;
1946 #if IS_ENABLED(CONFIG_IPV6)
1947 br->multicast_mld_version = 1;
1948 br->ip6_other_query.delay_time = 0;
1949 br->ip6_querier.port = NULL;
1950 #endif
1951 br->has_ipv6_addr = 1;
1952
1953 spin_lock_init(&br->multicast_lock);
1954 setup_timer(&br->multicast_router_timer,
1955 br_multicast_local_router_expired, 0);
1956 setup_timer(&br->ip4_other_query.timer,
1957 br_ip4_multicast_querier_expired, (unsigned long)br);
1958 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1959 (unsigned long)br);
1960 #if IS_ENABLED(CONFIG_IPV6)
1961 setup_timer(&br->ip6_other_query.timer,
1962 br_ip6_multicast_querier_expired, (unsigned long)br);
1963 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1964 (unsigned long)br);
1965 #endif
1966 }
1967
1968 static void __br_multicast_open(struct net_bridge *br,
1969 struct bridge_mcast_own_query *query)
1970 {
1971 query->startup_sent = 0;
1972
1973 if (br->multicast_disabled)
1974 return;
1975
1976 mod_timer(&query->timer, jiffies);
1977 }
1978
1979 void br_multicast_open(struct net_bridge *br)
1980 {
1981 __br_multicast_open(br, &br->ip4_own_query);
1982 #if IS_ENABLED(CONFIG_IPV6)
1983 __br_multicast_open(br, &br->ip6_own_query);
1984 #endif
1985 }
1986
1987 void br_multicast_stop(struct net_bridge *br)
1988 {
1989 del_timer_sync(&br->multicast_router_timer);
1990 del_timer_sync(&br->ip4_other_query.timer);
1991 del_timer_sync(&br->ip4_own_query.timer);
1992 #if IS_ENABLED(CONFIG_IPV6)
1993 del_timer_sync(&br->ip6_other_query.timer);
1994 del_timer_sync(&br->ip6_own_query.timer);
1995 #endif
1996 }
1997
1998 void br_multicast_dev_del(struct net_bridge *br)
1999 {
2000 struct net_bridge_mdb_htable *mdb;
2001 struct net_bridge_mdb_entry *mp;
2002 struct hlist_node *n;
2003 u32 ver;
2004 int i;
2005
2006 spin_lock_bh(&br->multicast_lock);
2007 mdb = mlock_dereference(br->mdb, br);
2008 if (!mdb)
2009 goto out;
2010
2011 br->mdb = NULL;
2012
2013 ver = mdb->ver;
2014 for (i = 0; i < mdb->max; i++) {
2015 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
2016 hlist[ver]) {
2017 del_timer(&mp->timer);
2018 call_rcu_bh(&mp->rcu, br_multicast_free_group);
2019 }
2020 }
2021
2022 if (mdb->old) {
2023 spin_unlock_bh(&br->multicast_lock);
2024 rcu_barrier_bh();
2025 spin_lock_bh(&br->multicast_lock);
2026 WARN_ON(mdb->old);
2027 }
2028
2029 mdb->old = mdb;
2030 call_rcu_bh(&mdb->rcu, br_mdb_free);
2031
2032 out:
2033 spin_unlock_bh(&br->multicast_lock);
2034
2035 free_percpu(br->mcast_stats);
2036 }
2037
2038 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2039 {
2040 int err = -EINVAL;
2041
2042 spin_lock_bh(&br->multicast_lock);
2043
2044 switch (val) {
2045 case MDB_RTR_TYPE_DISABLED:
2046 case MDB_RTR_TYPE_PERM:
2047 del_timer(&br->multicast_router_timer);
2048 /* fall through */
2049 case MDB_RTR_TYPE_TEMP_QUERY:
2050 br->multicast_router = val;
2051 err = 0;
2052 break;
2053 }
2054
2055 spin_unlock_bh(&br->multicast_lock);
2056
2057 return err;
2058 }
2059
2060 static void __del_port_router(struct net_bridge_port *p)
2061 {
2062 if (hlist_unhashed(&p->rlist))
2063 return;
2064 hlist_del_init_rcu(&p->rlist);
2065 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2066 br_port_mc_router_state_change(p, false);
2067
2068 /* don't allow timer refresh */
2069 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2070 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2071 }
2072
2073 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2074 {
2075 struct net_bridge *br = p->br;
2076 unsigned long now = jiffies;
2077 int err = -EINVAL;
2078
2079 spin_lock(&br->multicast_lock);
2080 if (p->multicast_router == val) {
2081 /* Refresh the temp router port timer */
2082 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2083 mod_timer(&p->multicast_router_timer,
2084 now + br->multicast_querier_interval);
2085 err = 0;
2086 goto unlock;
2087 }
2088 switch (val) {
2089 case MDB_RTR_TYPE_DISABLED:
2090 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2091 __del_port_router(p);
2092 del_timer(&p->multicast_router_timer);
2093 break;
2094 case MDB_RTR_TYPE_TEMP_QUERY:
2095 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2096 __del_port_router(p);
2097 break;
2098 case MDB_RTR_TYPE_PERM:
2099 p->multicast_router = MDB_RTR_TYPE_PERM;
2100 del_timer(&p->multicast_router_timer);
2101 br_multicast_add_router(br, p);
2102 break;
2103 case MDB_RTR_TYPE_TEMP:
2104 p->multicast_router = MDB_RTR_TYPE_TEMP;
2105 br_multicast_mark_router(br, p);
2106 break;
2107 default:
2108 goto unlock;
2109 }
2110 err = 0;
2111 unlock:
2112 spin_unlock(&br->multicast_lock);
2113
2114 return err;
2115 }
2116
2117 static void br_multicast_start_querier(struct net_bridge *br,
2118 struct bridge_mcast_own_query *query)
2119 {
2120 struct net_bridge_port *port;
2121
2122 __br_multicast_open(br, query);
2123
2124 list_for_each_entry(port, &br->port_list, list) {
2125 if (port->state == BR_STATE_DISABLED ||
2126 port->state == BR_STATE_BLOCKING)
2127 continue;
2128
2129 if (query == &br->ip4_own_query)
2130 br_multicast_enable(&port->ip4_own_query);
2131 #if IS_ENABLED(CONFIG_IPV6)
2132 else
2133 br_multicast_enable(&port->ip6_own_query);
2134 #endif
2135 }
2136 }
2137
2138 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2139 {
2140 struct net_bridge_mdb_htable *mdb;
2141 struct net_bridge_port *port;
2142 int err = 0;
2143
2144 spin_lock_bh(&br->multicast_lock);
2145 if (br->multicast_disabled == !val)
2146 goto unlock;
2147
2148 br_mc_disabled_update(br->dev, !val);
2149 br->multicast_disabled = !val;
2150 if (br->multicast_disabled)
2151 goto unlock;
2152
2153 if (!netif_running(br->dev))
2154 goto unlock;
2155
2156 mdb = mlock_dereference(br->mdb, br);
2157 if (mdb) {
2158 if (mdb->old) {
2159 err = -EEXIST;
2160 rollback:
2161 br->multicast_disabled = !!val;
2162 goto unlock;
2163 }
2164
2165 err = br_mdb_rehash(&br->mdb, mdb->max,
2166 br->hash_elasticity);
2167 if (err)
2168 goto rollback;
2169 }
2170
2171 br_multicast_open(br);
2172 list_for_each_entry(port, &br->port_list, list)
2173 __br_multicast_enable_port(port);
2174
2175 unlock:
2176 spin_unlock_bh(&br->multicast_lock);
2177
2178 return err;
2179 }
2180
2181 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2182 {
2183 unsigned long max_delay;
2184
2185 val = !!val;
2186
2187 spin_lock_bh(&br->multicast_lock);
2188 if (br->multicast_querier == val)
2189 goto unlock;
2190
2191 br->multicast_querier = val;
2192 if (!val)
2193 goto unlock;
2194
2195 max_delay = br->multicast_query_response_interval;
2196
2197 if (!timer_pending(&br->ip4_other_query.timer))
2198 br->ip4_other_query.delay_time = jiffies + max_delay;
2199
2200 br_multicast_start_querier(br, &br->ip4_own_query);
2201
2202 #if IS_ENABLED(CONFIG_IPV6)
2203 if (!timer_pending(&br->ip6_other_query.timer))
2204 br->ip6_other_query.delay_time = jiffies + max_delay;
2205
2206 br_multicast_start_querier(br, &br->ip6_own_query);
2207 #endif
2208
2209 unlock:
2210 spin_unlock_bh(&br->multicast_lock);
2211
2212 return 0;
2213 }
2214
2215 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2216 {
2217 int err = -EINVAL;
2218 u32 old;
2219 struct net_bridge_mdb_htable *mdb;
2220
2221 spin_lock_bh(&br->multicast_lock);
2222 if (!is_power_of_2(val))
2223 goto unlock;
2224
2225 mdb = mlock_dereference(br->mdb, br);
2226 if (mdb && val < mdb->size)
2227 goto unlock;
2228
2229 err = 0;
2230
2231 old = br->hash_max;
2232 br->hash_max = val;
2233
2234 if (mdb) {
2235 if (mdb->old) {
2236 err = -EEXIST;
2237 rollback:
2238 br->hash_max = old;
2239 goto unlock;
2240 }
2241
2242 err = br_mdb_rehash(&br->mdb, br->hash_max,
2243 br->hash_elasticity);
2244 if (err)
2245 goto rollback;
2246 }
2247
2248 unlock:
2249 spin_unlock_bh(&br->multicast_lock);
2250
2251 return err;
2252 }
2253
2254 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2255 {
2256 /* Currently we support only version 2 and 3 */
2257 switch (val) {
2258 case 2:
2259 case 3:
2260 break;
2261 default:
2262 return -EINVAL;
2263 }
2264
2265 spin_lock_bh(&br->multicast_lock);
2266 br->multicast_igmp_version = val;
2267 spin_unlock_bh(&br->multicast_lock);
2268
2269 return 0;
2270 }
2271
2272 #if IS_ENABLED(CONFIG_IPV6)
2273 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2274 {
2275 /* Currently we support version 1 and 2 */
2276 switch (val) {
2277 case 1:
2278 case 2:
2279 break;
2280 default:
2281 return -EINVAL;
2282 }
2283
2284 spin_lock_bh(&br->multicast_lock);
2285 br->multicast_mld_version = val;
2286 spin_unlock_bh(&br->multicast_lock);
2287
2288 return 0;
2289 }
2290 #endif
2291
2292 /**
2293 * br_multicast_list_adjacent - Returns snooped multicast addresses
2294 * @dev: The bridge port adjacent to which to retrieve addresses
2295 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2296 *
2297 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2298 * snooping feature on all bridge ports of dev's bridge device, excluding
2299 * the addresses from dev itself.
2300 *
2301 * Returns the number of items added to br_ip_list.
2302 *
2303 * Notes:
2304 * - br_ip_list needs to be initialized by caller
2305 * - br_ip_list might contain duplicates in the end
2306 * (needs to be taken care of by caller)
2307 * - br_ip_list needs to be freed by caller
2308 */
2309 int br_multicast_list_adjacent(struct net_device *dev,
2310 struct list_head *br_ip_list)
2311 {
2312 struct net_bridge *br;
2313 struct net_bridge_port *port;
2314 struct net_bridge_port_group *group;
2315 struct br_ip_list *entry;
2316 int count = 0;
2317
2318 rcu_read_lock();
2319 if (!br_ip_list || !br_port_exists(dev))
2320 goto unlock;
2321
2322 port = br_port_get_rcu(dev);
2323 if (!port || !port->br)
2324 goto unlock;
2325
2326 br = port->br;
2327
2328 list_for_each_entry_rcu(port, &br->port_list, list) {
2329 if (!port->dev || port->dev == dev)
2330 continue;
2331
2332 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2333 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2334 if (!entry)
2335 goto unlock;
2336
2337 entry->addr = group->addr;
2338 list_add(&entry->list, br_ip_list);
2339 count++;
2340 }
2341 }
2342
2343 unlock:
2344 rcu_read_unlock();
2345 return count;
2346 }
2347 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2348
2349 /**
2350 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2351 * @dev: The bridge port providing the bridge on which to check for a querier
2352 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2353 *
2354 * Checks whether the given interface has a bridge on top and if so returns
2355 * true if a valid querier exists anywhere on the bridged link layer.
2356 * Otherwise returns false.
2357 */
2358 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2359 {
2360 struct net_bridge *br;
2361 struct net_bridge_port *port;
2362 struct ethhdr eth;
2363 bool ret = false;
2364
2365 rcu_read_lock();
2366 if (!br_port_exists(dev))
2367 goto unlock;
2368
2369 port = br_port_get_rcu(dev);
2370 if (!port || !port->br)
2371 goto unlock;
2372
2373 br = port->br;
2374
2375 memset(&eth, 0, sizeof(eth));
2376 eth.h_proto = htons(proto);
2377
2378 ret = br_multicast_querier_exists(br, &eth);
2379
2380 unlock:
2381 rcu_read_unlock();
2382 return ret;
2383 }
2384 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2385
2386 /**
2387 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2388 * @dev: The bridge port adjacent to which to check for a querier
2389 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2390 *
2391 * Checks whether the given interface has a bridge on top and if so returns
2392 * true if a selected querier is behind one of the other ports of this
2393 * bridge. Otherwise returns false.
2394 */
2395 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2396 {
2397 struct net_bridge *br;
2398 struct net_bridge_port *port;
2399 bool ret = false;
2400
2401 rcu_read_lock();
2402 if (!br_port_exists(dev))
2403 goto unlock;
2404
2405 port = br_port_get_rcu(dev);
2406 if (!port || !port->br)
2407 goto unlock;
2408
2409 br = port->br;
2410
2411 switch (proto) {
2412 case ETH_P_IP:
2413 if (!timer_pending(&br->ip4_other_query.timer) ||
2414 rcu_dereference(br->ip4_querier.port) == port)
2415 goto unlock;
2416 break;
2417 #if IS_ENABLED(CONFIG_IPV6)
2418 case ETH_P_IPV6:
2419 if (!timer_pending(&br->ip6_other_query.timer) ||
2420 rcu_dereference(br->ip6_querier.port) == port)
2421 goto unlock;
2422 break;
2423 #endif
2424 default:
2425 goto unlock;
2426 }
2427
2428 ret = true;
2429 unlock:
2430 rcu_read_unlock();
2431 return ret;
2432 }
2433 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2434
2435 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2436 const struct sk_buff *skb, u8 type, u8 dir)
2437 {
2438 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2439 __be16 proto = skb->protocol;
2440 unsigned int t_len;
2441
2442 u64_stats_update_begin(&pstats->syncp);
2443 switch (proto) {
2444 case htons(ETH_P_IP):
2445 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2446 switch (type) {
2447 case IGMP_HOST_MEMBERSHIP_REPORT:
2448 pstats->mstats.igmp_v1reports[dir]++;
2449 break;
2450 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2451 pstats->mstats.igmp_v2reports[dir]++;
2452 break;
2453 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2454 pstats->mstats.igmp_v3reports[dir]++;
2455 break;
2456 case IGMP_HOST_MEMBERSHIP_QUERY:
2457 if (t_len != sizeof(struct igmphdr)) {
2458 pstats->mstats.igmp_v3queries[dir]++;
2459 } else {
2460 unsigned int offset = skb_transport_offset(skb);
2461 struct igmphdr *ih, _ihdr;
2462
2463 ih = skb_header_pointer(skb, offset,
2464 sizeof(_ihdr), &_ihdr);
2465 if (!ih)
2466 break;
2467 if (!ih->code)
2468 pstats->mstats.igmp_v1queries[dir]++;
2469 else
2470 pstats->mstats.igmp_v2queries[dir]++;
2471 }
2472 break;
2473 case IGMP_HOST_LEAVE_MESSAGE:
2474 pstats->mstats.igmp_leaves[dir]++;
2475 break;
2476 }
2477 break;
2478 #if IS_ENABLED(CONFIG_IPV6)
2479 case htons(ETH_P_IPV6):
2480 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2481 sizeof(struct ipv6hdr);
2482 t_len -= skb_network_header_len(skb);
2483 switch (type) {
2484 case ICMPV6_MGM_REPORT:
2485 pstats->mstats.mld_v1reports[dir]++;
2486 break;
2487 case ICMPV6_MLD2_REPORT:
2488 pstats->mstats.mld_v2reports[dir]++;
2489 break;
2490 case ICMPV6_MGM_QUERY:
2491 if (t_len != sizeof(struct mld_msg))
2492 pstats->mstats.mld_v2queries[dir]++;
2493 else
2494 pstats->mstats.mld_v1queries[dir]++;
2495 break;
2496 case ICMPV6_MGM_REDUCTION:
2497 pstats->mstats.mld_leaves[dir]++;
2498 break;
2499 }
2500 break;
2501 #endif /* CONFIG_IPV6 */
2502 }
2503 u64_stats_update_end(&pstats->syncp);
2504 }
2505
2506 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2507 const struct sk_buff *skb, u8 type, u8 dir)
2508 {
2509 struct bridge_mcast_stats __percpu *stats;
2510
2511 /* if multicast_disabled is true then igmp type can't be set */
2512 if (!type || !br->multicast_stats_enabled)
2513 return;
2514
2515 if (p)
2516 stats = p->mcast_stats;
2517 else
2518 stats = br->mcast_stats;
2519 if (WARN_ON(!stats))
2520 return;
2521
2522 br_mcast_stats_add(stats, skb, type, dir);
2523 }
2524
2525 int br_multicast_init_stats(struct net_bridge *br)
2526 {
2527 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2528 if (!br->mcast_stats)
2529 return -ENOMEM;
2530
2531 return 0;
2532 }
2533
2534 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2535 {
2536 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2537 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2538 }
2539
2540 void br_multicast_get_stats(const struct net_bridge *br,
2541 const struct net_bridge_port *p,
2542 struct br_mcast_stats *dest)
2543 {
2544 struct bridge_mcast_stats __percpu *stats;
2545 struct br_mcast_stats tdst;
2546 int i;
2547
2548 memset(dest, 0, sizeof(*dest));
2549 if (p)
2550 stats = p->mcast_stats;
2551 else
2552 stats = br->mcast_stats;
2553 if (WARN_ON(!stats))
2554 return;
2555
2556 memset(&tdst, 0, sizeof(tdst));
2557 for_each_possible_cpu(i) {
2558 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2559 struct br_mcast_stats temp;
2560 unsigned int start;
2561
2562 do {
2563 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2564 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2565 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2566
2567 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2568 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2569 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2570 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2571 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2572 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2573 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2574 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2575
2576 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2577 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2578 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2579 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2580 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2581 tdst.mld_parse_errors += temp.mld_parse_errors;
2582 }
2583 memcpy(dest, &tdst, sizeof(*dest));
2584 }
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