1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Bridge multicast support.
4 *
5 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7
8 #include <linux/err.h>
9 #include <linux/export.h>
10 #include <linux/if_ether.h>
11 #include <linux/igmp.h>
12 #include <linux/in.h>
13 #include <linux/jhash.h>
14 #include <linux/kernel.h>
15 #include <linux/log2.h>
16 #include <linux/netdevice.h>
17 #include <linux/netfilter_bridge.h>
18 #include <linux/random.h>
19 #include <linux/rculist.h>
20 #include <linux/skbuff.h>
21 #include <linux/slab.h>
22 #include <linux/timer.h>
23 #include <linux/inetdevice.h>
24 #include <linux/mroute.h>
25 #include <net/ip.h>
26 #include <net/switchdev.h>
27 #if IS_ENABLED(CONFIG_IPV6)
28 #include <linux/icmpv6.h>
29 #include <net/ipv6.h>
30 #include <net/mld.h>
31 #include <net/ip6_checksum.h>
32 #include <net/addrconf.h>
33 #endif
34
35 #include "br_private.h"
36
37 static const struct rhashtable_params br_mdb_rht_params = {
38 .head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
39 .key_offset = offsetof(struct net_bridge_mdb_entry, addr),
40 .key_len = sizeof(struct br_ip),
41 .automatic_shrinking = true,
42 };
43
44 static void br_multicast_start_querier(struct net_bridge *br,
45 struct bridge_mcast_own_query *query);
46 static void br_multicast_add_router(struct net_bridge *br,
47 struct net_bridge_port *port);
48 static void br_ip4_multicast_leave_group(struct net_bridge *br,
49 struct net_bridge_port *port,
50 __be32 group,
51 __u16 vid,
52 const unsigned char *src);
53
54 static void __del_port_router(struct net_bridge_port *p);
55 #if IS_ENABLED(CONFIG_IPV6)
56 static void br_ip6_multicast_leave_group(struct net_bridge *br,
57 struct net_bridge_port *port,
58 const struct in6_addr *group,
59 __u16 vid, const unsigned char *src);
60 #endif
61
br_mdb_ip_get_rcu(struct net_bridge * br,struct br_ip * dst)62 static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
63 struct br_ip *dst)
64 {
65 return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
66 }
67
br_mdb_ip_get(struct net_bridge * br,struct br_ip * dst)68 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
69 struct br_ip *dst)
70 {
71 struct net_bridge_mdb_entry *ent;
72
73 lockdep_assert_held_once(&br->multicast_lock);
74
75 rcu_read_lock();
76 ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
77 rcu_read_unlock();
78
79 return ent;
80 }
81
br_mdb_ip4_get(struct net_bridge * br,__be32 dst,__u16 vid)82 static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
83 __be32 dst, __u16 vid)
84 {
85 struct br_ip br_dst;
86
87 memset(&br_dst, 0, sizeof(br_dst));
88 br_dst.u.ip4 = dst;
89 br_dst.proto = htons(ETH_P_IP);
90 br_dst.vid = vid;
91
92 return br_mdb_ip_get(br, &br_dst);
93 }
94
95 #if IS_ENABLED(CONFIG_IPV6)
br_mdb_ip6_get(struct net_bridge * br,const struct in6_addr * dst,__u16 vid)96 static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
97 const struct in6_addr *dst,
98 __u16 vid)
99 {
100 struct br_ip br_dst;
101
102 memset(&br_dst, 0, sizeof(br_dst));
103 br_dst.u.ip6 = *dst;
104 br_dst.proto = htons(ETH_P_IPV6);
105 br_dst.vid = vid;
106
107 return br_mdb_ip_get(br, &br_dst);
108 }
109 #endif
110
br_mdb_get(struct net_bridge * br,struct sk_buff * skb,u16 vid)111 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
112 struct sk_buff *skb, u16 vid)
113 {
114 struct br_ip ip;
115
116 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
117 return NULL;
118
119 if (BR_INPUT_SKB_CB(skb)->igmp)
120 return NULL;
121
122 memset(&ip, 0, sizeof(ip));
123 ip.proto = skb->protocol;
124 ip.vid = vid;
125
126 switch (skb->protocol) {
127 case htons(ETH_P_IP):
128 ip.u.ip4 = ip_hdr(skb)->daddr;
129 break;
130 #if IS_ENABLED(CONFIG_IPV6)
131 case htons(ETH_P_IPV6):
132 ip.u.ip6 = ipv6_hdr(skb)->daddr;
133 break;
134 #endif
135 default:
136 return NULL;
137 }
138
139 return br_mdb_ip_get_rcu(br, &ip);
140 }
141
br_multicast_group_expired(struct timer_list * t)142 static void br_multicast_group_expired(struct timer_list *t)
143 {
144 struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
145 struct net_bridge *br = mp->br;
146
147 spin_lock(&br->multicast_lock);
148 if (!netif_running(br->dev) || timer_pending(&mp->timer))
149 goto out;
150
151 br_multicast_host_leave(mp, true);
152
153 if (mp->ports)
154 goto out;
155
156 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
157 br_mdb_rht_params);
158 hlist_del_rcu(&mp->mdb_node);
159
160 kfree_rcu(mp, rcu);
161
162 out:
163 spin_unlock(&br->multicast_lock);
164 }
165
br_multicast_del_pg(struct net_bridge * br,struct net_bridge_port_group * pg)166 static void br_multicast_del_pg(struct net_bridge *br,
167 struct net_bridge_port_group *pg)
168 {
169 struct net_bridge_mdb_entry *mp;
170 struct net_bridge_port_group *p;
171 struct net_bridge_port_group __rcu **pp;
172
173 mp = br_mdb_ip_get(br, &pg->addr);
174 if (WARN_ON(!mp))
175 return;
176
177 for (pp = &mp->ports;
178 (p = mlock_dereference(*pp, br)) != NULL;
179 pp = &p->next) {
180 if (p != pg)
181 continue;
182
183 rcu_assign_pointer(*pp, p->next);
184 hlist_del_init(&p->mglist);
185 del_timer(&p->timer);
186 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
187 p->flags);
188 kfree_rcu(p, rcu);
189
190 if (!mp->ports && !mp->host_joined &&
191 netif_running(br->dev))
192 mod_timer(&mp->timer, jiffies);
193
194 return;
195 }
196
197 WARN_ON(1);
198 }
199
br_multicast_port_group_expired(struct timer_list * t)200 static void br_multicast_port_group_expired(struct timer_list *t)
201 {
202 struct net_bridge_port_group *pg = from_timer(pg, t, timer);
203 struct net_bridge *br = pg->port->br;
204
205 spin_lock(&br->multicast_lock);
206 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
207 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
208 goto out;
209
210 br_multicast_del_pg(br, pg);
211
212 out:
213 spin_unlock(&br->multicast_lock);
214 }
215
br_ip4_multicast_alloc_query(struct net_bridge * br,__be32 group,u8 * igmp_type)216 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
217 __be32 group,
218 u8 *igmp_type)
219 {
220 struct igmpv3_query *ihv3;
221 size_t igmp_hdr_size;
222 struct sk_buff *skb;
223 struct igmphdr *ih;
224 struct ethhdr *eth;
225 struct iphdr *iph;
226
227 igmp_hdr_size = sizeof(*ih);
228 if (br->multicast_igmp_version == 3)
229 igmp_hdr_size = sizeof(*ihv3);
230 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
231 igmp_hdr_size + 4);
232 if (!skb)
233 goto out;
234
235 skb->protocol = htons(ETH_P_IP);
236
237 skb_reset_mac_header(skb);
238 eth = eth_hdr(skb);
239
240 ether_addr_copy(eth->h_source, br->dev->dev_addr);
241 eth->h_dest[0] = 1;
242 eth->h_dest[1] = 0;
243 eth->h_dest[2] = 0x5e;
244 eth->h_dest[3] = 0;
245 eth->h_dest[4] = 0;
246 eth->h_dest[5] = 1;
247 eth->h_proto = htons(ETH_P_IP);
248 skb_put(skb, sizeof(*eth));
249
250 skb_set_network_header(skb, skb->len);
251 iph = ip_hdr(skb);
252
253 iph->version = 4;
254 iph->ihl = 6;
255 iph->tos = 0xc0;
256 iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
257 iph->id = 0;
258 iph->frag_off = htons(IP_DF);
259 iph->ttl = 1;
260 iph->protocol = IPPROTO_IGMP;
261 iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
262 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
263 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
264 ((u8 *)&iph[1])[0] = IPOPT_RA;
265 ((u8 *)&iph[1])[1] = 4;
266 ((u8 *)&iph[1])[2] = 0;
267 ((u8 *)&iph[1])[3] = 0;
268 ip_send_check(iph);
269 skb_put(skb, 24);
270
271 skb_set_transport_header(skb, skb->len);
272 *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
273
274 switch (br->multicast_igmp_version) {
275 case 2:
276 ih = igmp_hdr(skb);
277 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
278 ih->code = (group ? br->multicast_last_member_interval :
279 br->multicast_query_response_interval) /
280 (HZ / IGMP_TIMER_SCALE);
281 ih->group = group;
282 ih->csum = 0;
283 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
284 break;
285 case 3:
286 ihv3 = igmpv3_query_hdr(skb);
287 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
288 ihv3->code = (group ? br->multicast_last_member_interval :
289 br->multicast_query_response_interval) /
290 (HZ / IGMP_TIMER_SCALE);
291 ihv3->group = group;
292 ihv3->qqic = br->multicast_query_interval / HZ;
293 ihv3->nsrcs = 0;
294 ihv3->resv = 0;
295 ihv3->suppress = 0;
296 ihv3->qrv = 2;
297 ihv3->csum = 0;
298 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
299 break;
300 }
301
302 skb_put(skb, igmp_hdr_size);
303 __skb_pull(skb, sizeof(*eth));
304
305 out:
306 return skb;
307 }
308
309 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_alloc_query(struct net_bridge * br,const struct in6_addr * grp,u8 * igmp_type)310 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
311 const struct in6_addr *grp,
312 u8 *igmp_type)
313 {
314 struct mld2_query *mld2q;
315 unsigned long interval;
316 struct ipv6hdr *ip6h;
317 struct mld_msg *mldq;
318 size_t mld_hdr_size;
319 struct sk_buff *skb;
320 struct ethhdr *eth;
321 u8 *hopopt;
322
323 mld_hdr_size = sizeof(*mldq);
324 if (br->multicast_mld_version == 2)
325 mld_hdr_size = sizeof(*mld2q);
326 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
327 8 + mld_hdr_size);
328 if (!skb)
329 goto out;
330
331 skb->protocol = htons(ETH_P_IPV6);
332
333 /* Ethernet header */
334 skb_reset_mac_header(skb);
335 eth = eth_hdr(skb);
336
337 ether_addr_copy(eth->h_source, br->dev->dev_addr);
338 eth->h_proto = htons(ETH_P_IPV6);
339 skb_put(skb, sizeof(*eth));
340
341 /* IPv6 header + HbH option */
342 skb_set_network_header(skb, skb->len);
343 ip6h = ipv6_hdr(skb);
344
345 *(__force __be32 *)ip6h = htonl(0x60000000);
346 ip6h->payload_len = htons(8 + mld_hdr_size);
347 ip6h->nexthdr = IPPROTO_HOPOPTS;
348 ip6h->hop_limit = 1;
349 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
350 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
351 &ip6h->saddr)) {
352 kfree_skb(skb);
353 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
354 return NULL;
355 }
356
357 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
358 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
359
360 hopopt = (u8 *)(ip6h + 1);
361 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
362 hopopt[1] = 0; /* length of HbH */
363 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
364 hopopt[3] = 2; /* Length of RA Option */
365 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
366 hopopt[5] = 0;
367 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
368 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
369
370 skb_put(skb, sizeof(*ip6h) + 8);
371
372 /* ICMPv6 */
373 skb_set_transport_header(skb, skb->len);
374 interval = ipv6_addr_any(grp) ?
375 br->multicast_query_response_interval :
376 br->multicast_last_member_interval;
377 *igmp_type = ICMPV6_MGM_QUERY;
378 switch (br->multicast_mld_version) {
379 case 1:
380 mldq = (struct mld_msg *)icmp6_hdr(skb);
381 mldq->mld_type = ICMPV6_MGM_QUERY;
382 mldq->mld_code = 0;
383 mldq->mld_cksum = 0;
384 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
385 mldq->mld_reserved = 0;
386 mldq->mld_mca = *grp;
387 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
388 sizeof(*mldq), IPPROTO_ICMPV6,
389 csum_partial(mldq,
390 sizeof(*mldq),
391 0));
392 break;
393 case 2:
394 mld2q = (struct mld2_query *)icmp6_hdr(skb);
395 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
396 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
397 mld2q->mld2q_code = 0;
398 mld2q->mld2q_cksum = 0;
399 mld2q->mld2q_resv1 = 0;
400 mld2q->mld2q_resv2 = 0;
401 mld2q->mld2q_suppress = 0;
402 mld2q->mld2q_qrv = 2;
403 mld2q->mld2q_nsrcs = 0;
404 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
405 mld2q->mld2q_mca = *grp;
406 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
407 sizeof(*mld2q),
408 IPPROTO_ICMPV6,
409 csum_partial(mld2q,
410 sizeof(*mld2q),
411 0));
412 break;
413 }
414 skb_put(skb, mld_hdr_size);
415
416 __skb_pull(skb, sizeof(*eth));
417
418 out:
419 return skb;
420 }
421 #endif
422
br_multicast_alloc_query(struct net_bridge * br,struct br_ip * addr,u8 * igmp_type)423 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
424 struct br_ip *addr,
425 u8 *igmp_type)
426 {
427 switch (addr->proto) {
428 case htons(ETH_P_IP):
429 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
430 #if IS_ENABLED(CONFIG_IPV6)
431 case htons(ETH_P_IPV6):
432 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
433 igmp_type);
434 #endif
435 }
436 return NULL;
437 }
438
br_multicast_new_group(struct net_bridge * br,struct br_ip * group)439 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
440 struct br_ip *group)
441 {
442 struct net_bridge_mdb_entry *mp;
443 int err;
444
445 mp = br_mdb_ip_get(br, group);
446 if (mp)
447 return mp;
448
449 if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
450 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
451 return ERR_PTR(-E2BIG);
452 }
453
454 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
455 if (unlikely(!mp))
456 return ERR_PTR(-ENOMEM);
457
458 mp->br = br;
459 mp->addr = *group;
460 timer_setup(&mp->timer, br_multicast_group_expired, 0);
461 err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
462 br_mdb_rht_params);
463 if (err) {
464 kfree(mp);
465 mp = ERR_PTR(err);
466 } else {
467 hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
468 }
469
470 return mp;
471 }
472
br_multicast_new_port_group(struct net_bridge_port * port,struct br_ip * group,struct net_bridge_port_group __rcu * next,unsigned char flags,const unsigned char * src)473 struct net_bridge_port_group *br_multicast_new_port_group(
474 struct net_bridge_port *port,
475 struct br_ip *group,
476 struct net_bridge_port_group __rcu *next,
477 unsigned char flags,
478 const unsigned char *src)
479 {
480 struct net_bridge_port_group *p;
481
482 p = kzalloc(sizeof(*p), GFP_ATOMIC);
483 if (unlikely(!p))
484 return NULL;
485
486 p->addr = *group;
487 p->port = port;
488 p->flags = flags;
489 rcu_assign_pointer(p->next, next);
490 hlist_add_head(&p->mglist, &port->mglist);
491 timer_setup(&p->timer, br_multicast_port_group_expired, 0);
492
493 if (src)
494 memcpy(p->eth_addr, src, ETH_ALEN);
495 else
496 eth_broadcast_addr(p->eth_addr);
497
498 return p;
499 }
500
br_port_group_equal(struct net_bridge_port_group * p,struct net_bridge_port * port,const unsigned char * src)501 static bool br_port_group_equal(struct net_bridge_port_group *p,
502 struct net_bridge_port *port,
503 const unsigned char *src)
504 {
505 if (p->port != port)
506 return false;
507
508 if (!(port->flags & BR_MULTICAST_TO_UNICAST))
509 return true;
510
511 return ether_addr_equal(src, p->eth_addr);
512 }
513
br_multicast_host_join(struct net_bridge_mdb_entry * mp,bool notify)514 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify)
515 {
516 if (!mp->host_joined) {
517 mp->host_joined = true;
518 if (notify)
519 br_mdb_notify(mp->br->dev, NULL, &mp->addr,
520 RTM_NEWMDB, 0);
521 }
522 mod_timer(&mp->timer, jiffies + mp->br->multicast_membership_interval);
523 }
524
br_multicast_host_leave(struct net_bridge_mdb_entry * mp,bool notify)525 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify)
526 {
527 if (!mp->host_joined)
528 return;
529
530 mp->host_joined = false;
531 if (notify)
532 br_mdb_notify(mp->br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
533 }
534
br_multicast_add_group(struct net_bridge * br,struct net_bridge_port * port,struct br_ip * group,const unsigned char * src)535 static int br_multicast_add_group(struct net_bridge *br,
536 struct net_bridge_port *port,
537 struct br_ip *group,
538 const unsigned char *src)
539 {
540 struct net_bridge_port_group __rcu **pp;
541 struct net_bridge_port_group *p;
542 struct net_bridge_mdb_entry *mp;
543 unsigned long now = jiffies;
544 int err;
545
546 spin_lock(&br->multicast_lock);
547 if (!netif_running(br->dev) ||
548 (port && port->state == BR_STATE_DISABLED))
549 goto out;
550
551 mp = br_multicast_new_group(br, group);
552 err = PTR_ERR(mp);
553 if (IS_ERR(mp))
554 goto err;
555
556 if (!port) {
557 br_multicast_host_join(mp, true);
558 goto out;
559 }
560
561 for (pp = &mp->ports;
562 (p = mlock_dereference(*pp, br)) != NULL;
563 pp = &p->next) {
564 if (br_port_group_equal(p, port, src))
565 goto found;
566 if ((unsigned long)p->port < (unsigned long)port)
567 break;
568 }
569
570 p = br_multicast_new_port_group(port, group, *pp, 0, src);
571 if (unlikely(!p))
572 goto err;
573 rcu_assign_pointer(*pp, p);
574 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
575
576 found:
577 mod_timer(&p->timer, now + br->multicast_membership_interval);
578 out:
579 err = 0;
580
581 err:
582 spin_unlock(&br->multicast_lock);
583 return err;
584 }
585
br_ip4_multicast_add_group(struct net_bridge * br,struct net_bridge_port * port,__be32 group,__u16 vid,const unsigned char * src)586 static int br_ip4_multicast_add_group(struct net_bridge *br,
587 struct net_bridge_port *port,
588 __be32 group,
589 __u16 vid,
590 const unsigned char *src)
591 {
592 struct br_ip br_group;
593
594 if (ipv4_is_local_multicast(group))
595 return 0;
596
597 memset(&br_group, 0, sizeof(br_group));
598 br_group.u.ip4 = group;
599 br_group.proto = htons(ETH_P_IP);
600 br_group.vid = vid;
601
602 return br_multicast_add_group(br, port, &br_group, src);
603 }
604
605 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_add_group(struct net_bridge * br,struct net_bridge_port * port,const struct in6_addr * group,__u16 vid,const unsigned char * src)606 static int br_ip6_multicast_add_group(struct net_bridge *br,
607 struct net_bridge_port *port,
608 const struct in6_addr *group,
609 __u16 vid,
610 const unsigned char *src)
611 {
612 struct br_ip br_group;
613
614 if (ipv6_addr_is_ll_all_nodes(group))
615 return 0;
616
617 memset(&br_group, 0, sizeof(br_group));
618 br_group.u.ip6 = *group;
619 br_group.proto = htons(ETH_P_IPV6);
620 br_group.vid = vid;
621
622 return br_multicast_add_group(br, port, &br_group, src);
623 }
624 #endif
625
br_multicast_router_expired(struct timer_list * t)626 static void br_multicast_router_expired(struct timer_list *t)
627 {
628 struct net_bridge_port *port =
629 from_timer(port, t, multicast_router_timer);
630 struct net_bridge *br = port->br;
631
632 spin_lock(&br->multicast_lock);
633 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
634 port->multicast_router == MDB_RTR_TYPE_PERM ||
635 timer_pending(&port->multicast_router_timer))
636 goto out;
637
638 __del_port_router(port);
639 out:
640 spin_unlock(&br->multicast_lock);
641 }
642
br_mc_router_state_change(struct net_bridge * p,bool is_mc_router)643 static void br_mc_router_state_change(struct net_bridge *p,
644 bool is_mc_router)
645 {
646 struct switchdev_attr attr = {
647 .orig_dev = p->dev,
648 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
649 .flags = SWITCHDEV_F_DEFER,
650 .u.mrouter = is_mc_router,
651 };
652
653 switchdev_port_attr_set(p->dev, &attr);
654 }
655
br_multicast_local_router_expired(struct timer_list * t)656 static void br_multicast_local_router_expired(struct timer_list *t)
657 {
658 struct net_bridge *br = from_timer(br, t, multicast_router_timer);
659
660 spin_lock(&br->multicast_lock);
661 if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
662 br->multicast_router == MDB_RTR_TYPE_PERM ||
663 timer_pending(&br->multicast_router_timer))
664 goto out;
665
666 br_mc_router_state_change(br, false);
667 out:
668 spin_unlock(&br->multicast_lock);
669 }
670
br_multicast_querier_expired(struct net_bridge * br,struct bridge_mcast_own_query * query)671 static void br_multicast_querier_expired(struct net_bridge *br,
672 struct bridge_mcast_own_query *query)
673 {
674 spin_lock(&br->multicast_lock);
675 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
676 goto out;
677
678 br_multicast_start_querier(br, query);
679
680 out:
681 spin_unlock(&br->multicast_lock);
682 }
683
br_ip4_multicast_querier_expired(struct timer_list * t)684 static void br_ip4_multicast_querier_expired(struct timer_list *t)
685 {
686 struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
687
688 br_multicast_querier_expired(br, &br->ip4_own_query);
689 }
690
691 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_querier_expired(struct timer_list * t)692 static void br_ip6_multicast_querier_expired(struct timer_list *t)
693 {
694 struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
695
696 br_multicast_querier_expired(br, &br->ip6_own_query);
697 }
698 #endif
699
br_multicast_select_own_querier(struct net_bridge * br,struct br_ip * ip,struct sk_buff * skb)700 static void br_multicast_select_own_querier(struct net_bridge *br,
701 struct br_ip *ip,
702 struct sk_buff *skb)
703 {
704 if (ip->proto == htons(ETH_P_IP))
705 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
706 #if IS_ENABLED(CONFIG_IPV6)
707 else
708 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
709 #endif
710 }
711
__br_multicast_send_query(struct net_bridge * br,struct net_bridge_port * port,struct br_ip * ip)712 static void __br_multicast_send_query(struct net_bridge *br,
713 struct net_bridge_port *port,
714 struct br_ip *ip)
715 {
716 struct sk_buff *skb;
717 u8 igmp_type;
718
719 skb = br_multicast_alloc_query(br, ip, &igmp_type);
720 if (!skb)
721 return;
722
723 if (port) {
724 skb->dev = port->dev;
725 br_multicast_count(br, port, skb, igmp_type,
726 BR_MCAST_DIR_TX);
727 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
728 dev_net(port->dev), NULL, skb, NULL, skb->dev,
729 br_dev_queue_push_xmit);
730 } else {
731 br_multicast_select_own_querier(br, ip, skb);
732 br_multicast_count(br, port, skb, igmp_type,
733 BR_MCAST_DIR_RX);
734 netif_rx(skb);
735 }
736 }
737
br_multicast_send_query(struct net_bridge * br,struct net_bridge_port * port,struct bridge_mcast_own_query * own_query)738 static void br_multicast_send_query(struct net_bridge *br,
739 struct net_bridge_port *port,
740 struct bridge_mcast_own_query *own_query)
741 {
742 struct bridge_mcast_other_query *other_query = NULL;
743 struct br_ip br_group;
744 unsigned long time;
745
746 if (!netif_running(br->dev) ||
747 !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
748 !br_opt_get(br, BROPT_MULTICAST_QUERIER))
749 return;
750
751 memset(&br_group.u, 0, sizeof(br_group.u));
752
753 if (port ? (own_query == &port->ip4_own_query) :
754 (own_query == &br->ip4_own_query)) {
755 other_query = &br->ip4_other_query;
756 br_group.proto = htons(ETH_P_IP);
757 #if IS_ENABLED(CONFIG_IPV6)
758 } else {
759 other_query = &br->ip6_other_query;
760 br_group.proto = htons(ETH_P_IPV6);
761 #endif
762 }
763
764 if (!other_query || timer_pending(&other_query->timer))
765 return;
766
767 __br_multicast_send_query(br, port, &br_group);
768
769 time = jiffies;
770 time += own_query->startup_sent < br->multicast_startup_query_count ?
771 br->multicast_startup_query_interval :
772 br->multicast_query_interval;
773 mod_timer(&own_query->timer, time);
774 }
775
776 static void
br_multicast_port_query_expired(struct net_bridge_port * port,struct bridge_mcast_own_query * query)777 br_multicast_port_query_expired(struct net_bridge_port *port,
778 struct bridge_mcast_own_query *query)
779 {
780 struct net_bridge *br = port->br;
781
782 spin_lock(&br->multicast_lock);
783 if (port->state == BR_STATE_DISABLED ||
784 port->state == BR_STATE_BLOCKING)
785 goto out;
786
787 if (query->startup_sent < br->multicast_startup_query_count)
788 query->startup_sent++;
789
790 br_multicast_send_query(port->br, port, query);
791
792 out:
793 spin_unlock(&br->multicast_lock);
794 }
795
br_ip4_multicast_port_query_expired(struct timer_list * t)796 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
797 {
798 struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
799
800 br_multicast_port_query_expired(port, &port->ip4_own_query);
801 }
802
803 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_port_query_expired(struct timer_list * t)804 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
805 {
806 struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
807
808 br_multicast_port_query_expired(port, &port->ip6_own_query);
809 }
810 #endif
811
br_mc_disabled_update(struct net_device * dev,bool value)812 static void br_mc_disabled_update(struct net_device *dev, bool value)
813 {
814 struct switchdev_attr attr = {
815 .orig_dev = dev,
816 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
817 .flags = SWITCHDEV_F_DEFER,
818 .u.mc_disabled = !value,
819 };
820
821 switchdev_port_attr_set(dev, &attr);
822 }
823
br_multicast_add_port(struct net_bridge_port * port)824 int br_multicast_add_port(struct net_bridge_port *port)
825 {
826 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
827
828 timer_setup(&port->multicast_router_timer,
829 br_multicast_router_expired, 0);
830 timer_setup(&port->ip4_own_query.timer,
831 br_ip4_multicast_port_query_expired, 0);
832 #if IS_ENABLED(CONFIG_IPV6)
833 timer_setup(&port->ip6_own_query.timer,
834 br_ip6_multicast_port_query_expired, 0);
835 #endif
836 br_mc_disabled_update(port->dev,
837 br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
838
839 port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
840 if (!port->mcast_stats)
841 return -ENOMEM;
842
843 return 0;
844 }
845
br_multicast_del_port(struct net_bridge_port * port)846 void br_multicast_del_port(struct net_bridge_port *port)
847 {
848 struct net_bridge *br = port->br;
849 struct net_bridge_port_group *pg;
850 struct hlist_node *n;
851
852 /* Take care of the remaining groups, only perm ones should be left */
853 spin_lock_bh(&br->multicast_lock);
854 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
855 br_multicast_del_pg(br, pg);
856 spin_unlock_bh(&br->multicast_lock);
857 del_timer_sync(&port->multicast_router_timer);
858 free_percpu(port->mcast_stats);
859 }
860
br_multicast_enable(struct bridge_mcast_own_query * query)861 static void br_multicast_enable(struct bridge_mcast_own_query *query)
862 {
863 query->startup_sent = 0;
864
865 if (try_to_del_timer_sync(&query->timer) >= 0 ||
866 del_timer(&query->timer))
867 mod_timer(&query->timer, jiffies);
868 }
869
__br_multicast_enable_port(struct net_bridge_port * port)870 static void __br_multicast_enable_port(struct net_bridge_port *port)
871 {
872 struct net_bridge *br = port->br;
873
874 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
875 return;
876
877 br_multicast_enable(&port->ip4_own_query);
878 #if IS_ENABLED(CONFIG_IPV6)
879 br_multicast_enable(&port->ip6_own_query);
880 #endif
881 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
882 hlist_unhashed(&port->rlist))
883 br_multicast_add_router(br, port);
884 }
885
br_multicast_enable_port(struct net_bridge_port * port)886 void br_multicast_enable_port(struct net_bridge_port *port)
887 {
888 struct net_bridge *br = port->br;
889
890 spin_lock(&br->multicast_lock);
891 __br_multicast_enable_port(port);
892 spin_unlock(&br->multicast_lock);
893 }
894
br_multicast_disable_port(struct net_bridge_port * port)895 void br_multicast_disable_port(struct net_bridge_port *port)
896 {
897 struct net_bridge *br = port->br;
898 struct net_bridge_port_group *pg;
899 struct hlist_node *n;
900
901 spin_lock(&br->multicast_lock);
902 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
903 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
904 br_multicast_del_pg(br, pg);
905
906 __del_port_router(port);
907
908 del_timer(&port->multicast_router_timer);
909 del_timer(&port->ip4_own_query.timer);
910 #if IS_ENABLED(CONFIG_IPV6)
911 del_timer(&port->ip6_own_query.timer);
912 #endif
913 spin_unlock(&br->multicast_lock);
914 }
915
br_ip4_multicast_igmp3_report(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb,u16 vid)916 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
917 struct net_bridge_port *port,
918 struct sk_buff *skb,
919 u16 vid)
920 {
921 const unsigned char *src;
922 struct igmpv3_report *ih;
923 struct igmpv3_grec *grec;
924 int i;
925 int len;
926 int num;
927 int type;
928 int err = 0;
929 __be32 group;
930 u16 nsrcs;
931
932 ih = igmpv3_report_hdr(skb);
933 num = ntohs(ih->ngrec);
934 len = skb_transport_offset(skb) + sizeof(*ih);
935
936 for (i = 0; i < num; i++) {
937 len += sizeof(*grec);
938 if (!ip_mc_may_pull(skb, len))
939 return -EINVAL;
940
941 grec = (void *)(skb->data + len - sizeof(*grec));
942 group = grec->grec_mca;
943 type = grec->grec_type;
944 nsrcs = ntohs(grec->grec_nsrcs);
945
946 len += nsrcs * 4;
947 if (!ip_mc_may_pull(skb, len))
948 return -EINVAL;
949
950 /* We treat this as an IGMPv2 report for now. */
951 switch (type) {
952 case IGMPV3_MODE_IS_INCLUDE:
953 case IGMPV3_MODE_IS_EXCLUDE:
954 case IGMPV3_CHANGE_TO_INCLUDE:
955 case IGMPV3_CHANGE_TO_EXCLUDE:
956 case IGMPV3_ALLOW_NEW_SOURCES:
957 case IGMPV3_BLOCK_OLD_SOURCES:
958 break;
959
960 default:
961 continue;
962 }
963
964 src = eth_hdr(skb)->h_source;
965 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
966 type == IGMPV3_MODE_IS_INCLUDE) &&
967 nsrcs == 0) {
968 br_ip4_multicast_leave_group(br, port, group, vid, src);
969 } else {
970 err = br_ip4_multicast_add_group(br, port, group, vid,
971 src);
972 if (err)
973 break;
974 }
975 }
976
977 return err;
978 }
979
980 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_mld2_report(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb,u16 vid)981 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
982 struct net_bridge_port *port,
983 struct sk_buff *skb,
984 u16 vid)
985 {
986 unsigned int nsrcs_offset;
987 const unsigned char *src;
988 struct icmp6hdr *icmp6h;
989 struct mld2_grec *grec;
990 unsigned int grec_len;
991 int i;
992 int len;
993 int num;
994 int err = 0;
995
996 if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
997 return -EINVAL;
998
999 icmp6h = icmp6_hdr(skb);
1000 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1001 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1002
1003 for (i = 0; i < num; i++) {
1004 __be16 *_nsrcs, __nsrcs;
1005 u16 nsrcs;
1006
1007 nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
1008
1009 if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
1010 nsrcs_offset + sizeof(_nsrcs))
1011 return -EINVAL;
1012
1013 _nsrcs = skb_header_pointer(skb, nsrcs_offset,
1014 sizeof(__nsrcs), &__nsrcs);
1015 if (!_nsrcs)
1016 return -EINVAL;
1017
1018 nsrcs = ntohs(*_nsrcs);
1019 grec_len = struct_size(grec, grec_src, nsrcs);
1020
1021 if (!ipv6_mc_may_pull(skb, len + grec_len))
1022 return -EINVAL;
1023
1024 grec = (struct mld2_grec *)(skb->data + len);
1025 len += grec_len;
1026
1027 /* We treat these as MLDv1 reports for now. */
1028 switch (grec->grec_type) {
1029 case MLD2_MODE_IS_INCLUDE:
1030 case MLD2_MODE_IS_EXCLUDE:
1031 case MLD2_CHANGE_TO_INCLUDE:
1032 case MLD2_CHANGE_TO_EXCLUDE:
1033 case MLD2_ALLOW_NEW_SOURCES:
1034 case MLD2_BLOCK_OLD_SOURCES:
1035 break;
1036
1037 default:
1038 continue;
1039 }
1040
1041 src = eth_hdr(skb)->h_source;
1042 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1043 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1044 nsrcs == 0) {
1045 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1046 vid, src);
1047 } else {
1048 err = br_ip6_multicast_add_group(br, port,
1049 &grec->grec_mca, vid,
1050 src);
1051 if (err)
1052 break;
1053 }
1054 }
1055
1056 return err;
1057 }
1058 #endif
1059
br_ip4_multicast_select_querier(struct net_bridge * br,struct net_bridge_port * port,__be32 saddr)1060 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1061 struct net_bridge_port *port,
1062 __be32 saddr)
1063 {
1064 if (!timer_pending(&br->ip4_own_query.timer) &&
1065 !timer_pending(&br->ip4_other_query.timer))
1066 goto update;
1067
1068 if (!br->ip4_querier.addr.u.ip4)
1069 goto update;
1070
1071 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1072 goto update;
1073
1074 return false;
1075
1076 update:
1077 br->ip4_querier.addr.u.ip4 = saddr;
1078
1079 /* update protected by general multicast_lock by caller */
1080 rcu_assign_pointer(br->ip4_querier.port, port);
1081
1082 return true;
1083 }
1084
1085 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_select_querier(struct net_bridge * br,struct net_bridge_port * port,struct in6_addr * saddr)1086 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1087 struct net_bridge_port *port,
1088 struct in6_addr *saddr)
1089 {
1090 if (!timer_pending(&br->ip6_own_query.timer) &&
1091 !timer_pending(&br->ip6_other_query.timer))
1092 goto update;
1093
1094 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1095 goto update;
1096
1097 return false;
1098
1099 update:
1100 br->ip6_querier.addr.u.ip6 = *saddr;
1101
1102 /* update protected by general multicast_lock by caller */
1103 rcu_assign_pointer(br->ip6_querier.port, port);
1104
1105 return true;
1106 }
1107 #endif
1108
br_multicast_select_querier(struct net_bridge * br,struct net_bridge_port * port,struct br_ip * saddr)1109 static bool br_multicast_select_querier(struct net_bridge *br,
1110 struct net_bridge_port *port,
1111 struct br_ip *saddr)
1112 {
1113 switch (saddr->proto) {
1114 case htons(ETH_P_IP):
1115 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1116 #if IS_ENABLED(CONFIG_IPV6)
1117 case htons(ETH_P_IPV6):
1118 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1119 #endif
1120 }
1121
1122 return false;
1123 }
1124
1125 static void
br_multicast_update_query_timer(struct net_bridge * br,struct bridge_mcast_other_query * query,unsigned long max_delay)1126 br_multicast_update_query_timer(struct net_bridge *br,
1127 struct bridge_mcast_other_query *query,
1128 unsigned long max_delay)
1129 {
1130 if (!timer_pending(&query->timer))
1131 query->delay_time = jiffies + max_delay;
1132
1133 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1134 }
1135
br_port_mc_router_state_change(struct net_bridge_port * p,bool is_mc_router)1136 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1137 bool is_mc_router)
1138 {
1139 struct switchdev_attr attr = {
1140 .orig_dev = p->dev,
1141 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1142 .flags = SWITCHDEV_F_DEFER,
1143 .u.mrouter = is_mc_router,
1144 };
1145
1146 switchdev_port_attr_set(p->dev, &attr);
1147 }
1148
1149 /*
1150 * Add port to router_list
1151 * list is maintained ordered by pointer value
1152 * and locked by br->multicast_lock and RCU
1153 */
br_multicast_add_router(struct net_bridge * br,struct net_bridge_port * port)1154 static void br_multicast_add_router(struct net_bridge *br,
1155 struct net_bridge_port *port)
1156 {
1157 struct net_bridge_port *p;
1158 struct hlist_node *slot = NULL;
1159
1160 if (!hlist_unhashed(&port->rlist))
1161 return;
1162
1163 hlist_for_each_entry(p, &br->router_list, rlist) {
1164 if ((unsigned long) port >= (unsigned long) p)
1165 break;
1166 slot = &p->rlist;
1167 }
1168
1169 if (slot)
1170 hlist_add_behind_rcu(&port->rlist, slot);
1171 else
1172 hlist_add_head_rcu(&port->rlist, &br->router_list);
1173 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1174 br_port_mc_router_state_change(port, true);
1175 }
1176
br_multicast_mark_router(struct net_bridge * br,struct net_bridge_port * port)1177 static void br_multicast_mark_router(struct net_bridge *br,
1178 struct net_bridge_port *port)
1179 {
1180 unsigned long now = jiffies;
1181
1182 if (!port) {
1183 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1184 if (!timer_pending(&br->multicast_router_timer))
1185 br_mc_router_state_change(br, true);
1186 mod_timer(&br->multicast_router_timer,
1187 now + br->multicast_querier_interval);
1188 }
1189 return;
1190 }
1191
1192 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1193 port->multicast_router == MDB_RTR_TYPE_PERM)
1194 return;
1195
1196 br_multicast_add_router(br, port);
1197
1198 mod_timer(&port->multicast_router_timer,
1199 now + br->multicast_querier_interval);
1200 }
1201
br_multicast_query_received(struct net_bridge * br,struct net_bridge_port * port,struct bridge_mcast_other_query * query,struct br_ip * saddr,unsigned long max_delay)1202 static void br_multicast_query_received(struct net_bridge *br,
1203 struct net_bridge_port *port,
1204 struct bridge_mcast_other_query *query,
1205 struct br_ip *saddr,
1206 unsigned long max_delay)
1207 {
1208 if (!br_multicast_select_querier(br, port, saddr))
1209 return;
1210
1211 br_multicast_update_query_timer(br, query, max_delay);
1212 br_multicast_mark_router(br, port);
1213 }
1214
br_ip4_multicast_query(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb,u16 vid)1215 static void br_ip4_multicast_query(struct net_bridge *br,
1216 struct net_bridge_port *port,
1217 struct sk_buff *skb,
1218 u16 vid)
1219 {
1220 unsigned int transport_len = ip_transport_len(skb);
1221 const struct iphdr *iph = ip_hdr(skb);
1222 struct igmphdr *ih = igmp_hdr(skb);
1223 struct net_bridge_mdb_entry *mp;
1224 struct igmpv3_query *ih3;
1225 struct net_bridge_port_group *p;
1226 struct net_bridge_port_group __rcu **pp;
1227 struct br_ip saddr;
1228 unsigned long max_delay;
1229 unsigned long now = jiffies;
1230 __be32 group;
1231
1232 spin_lock(&br->multicast_lock);
1233 if (!netif_running(br->dev) ||
1234 (port && port->state == BR_STATE_DISABLED))
1235 goto out;
1236
1237 group = ih->group;
1238
1239 if (transport_len == sizeof(*ih)) {
1240 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1241
1242 if (!max_delay) {
1243 max_delay = 10 * HZ;
1244 group = 0;
1245 }
1246 } else if (transport_len >= sizeof(*ih3)) {
1247 ih3 = igmpv3_query_hdr(skb);
1248 if (ih3->nsrcs)
1249 goto out;
1250
1251 max_delay = ih3->code ?
1252 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1253 } else {
1254 goto out;
1255 }
1256
1257 if (!group) {
1258 saddr.proto = htons(ETH_P_IP);
1259 saddr.u.ip4 = iph->saddr;
1260
1261 br_multicast_query_received(br, port, &br->ip4_other_query,
1262 &saddr, max_delay);
1263 goto out;
1264 }
1265
1266 mp = br_mdb_ip4_get(br, group, vid);
1267 if (!mp)
1268 goto out;
1269
1270 max_delay *= br->multicast_last_member_count;
1271
1272 if (mp->host_joined &&
1273 (timer_pending(&mp->timer) ?
1274 time_after(mp->timer.expires, now + max_delay) :
1275 try_to_del_timer_sync(&mp->timer) >= 0))
1276 mod_timer(&mp->timer, now + max_delay);
1277
1278 for (pp = &mp->ports;
1279 (p = mlock_dereference(*pp, br)) != NULL;
1280 pp = &p->next) {
1281 if (timer_pending(&p->timer) ?
1282 time_after(p->timer.expires, now + max_delay) :
1283 try_to_del_timer_sync(&p->timer) >= 0)
1284 mod_timer(&p->timer, now + max_delay);
1285 }
1286
1287 out:
1288 spin_unlock(&br->multicast_lock);
1289 }
1290
1291 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_query(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb,u16 vid)1292 static int br_ip6_multicast_query(struct net_bridge *br,
1293 struct net_bridge_port *port,
1294 struct sk_buff *skb,
1295 u16 vid)
1296 {
1297 unsigned int transport_len = ipv6_transport_len(skb);
1298 struct mld_msg *mld;
1299 struct net_bridge_mdb_entry *mp;
1300 struct mld2_query *mld2q;
1301 struct net_bridge_port_group *p;
1302 struct net_bridge_port_group __rcu **pp;
1303 struct br_ip saddr;
1304 unsigned long max_delay;
1305 unsigned long now = jiffies;
1306 unsigned int offset = skb_transport_offset(skb);
1307 const struct in6_addr *group = NULL;
1308 bool is_general_query;
1309 int err = 0;
1310
1311 spin_lock(&br->multicast_lock);
1312 if (!netif_running(br->dev) ||
1313 (port && port->state == BR_STATE_DISABLED))
1314 goto out;
1315
1316 if (transport_len == sizeof(*mld)) {
1317 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1318 err = -EINVAL;
1319 goto out;
1320 }
1321 mld = (struct mld_msg *) icmp6_hdr(skb);
1322 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1323 if (max_delay)
1324 group = &mld->mld_mca;
1325 } else {
1326 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1327 err = -EINVAL;
1328 goto out;
1329 }
1330 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1331 if (!mld2q->mld2q_nsrcs)
1332 group = &mld2q->mld2q_mca;
1333
1334 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1335 }
1336
1337 is_general_query = group && ipv6_addr_any(group);
1338
1339 if (is_general_query) {
1340 saddr.proto = htons(ETH_P_IPV6);
1341 saddr.u.ip6 = ipv6_hdr(skb)->saddr;
1342
1343 br_multicast_query_received(br, port, &br->ip6_other_query,
1344 &saddr, max_delay);
1345 goto out;
1346 } else if (!group) {
1347 goto out;
1348 }
1349
1350 mp = br_mdb_ip6_get(br, group, vid);
1351 if (!mp)
1352 goto out;
1353
1354 max_delay *= br->multicast_last_member_count;
1355 if (mp->host_joined &&
1356 (timer_pending(&mp->timer) ?
1357 time_after(mp->timer.expires, now + max_delay) :
1358 try_to_del_timer_sync(&mp->timer) >= 0))
1359 mod_timer(&mp->timer, now + max_delay);
1360
1361 for (pp = &mp->ports;
1362 (p = mlock_dereference(*pp, br)) != NULL;
1363 pp = &p->next) {
1364 if (timer_pending(&p->timer) ?
1365 time_after(p->timer.expires, now + max_delay) :
1366 try_to_del_timer_sync(&p->timer) >= 0)
1367 mod_timer(&p->timer, now + max_delay);
1368 }
1369
1370 out:
1371 spin_unlock(&br->multicast_lock);
1372 return err;
1373 }
1374 #endif
1375
1376 static void
br_multicast_leave_group(struct net_bridge * br,struct net_bridge_port * port,struct br_ip * group,struct bridge_mcast_other_query * other_query,struct bridge_mcast_own_query * own_query,const unsigned char * src)1377 br_multicast_leave_group(struct net_bridge *br,
1378 struct net_bridge_port *port,
1379 struct br_ip *group,
1380 struct bridge_mcast_other_query *other_query,
1381 struct bridge_mcast_own_query *own_query,
1382 const unsigned char *src)
1383 {
1384 struct net_bridge_mdb_entry *mp;
1385 struct net_bridge_port_group *p;
1386 unsigned long now;
1387 unsigned long time;
1388
1389 spin_lock(&br->multicast_lock);
1390 if (!netif_running(br->dev) ||
1391 (port && port->state == BR_STATE_DISABLED))
1392 goto out;
1393
1394 mp = br_mdb_ip_get(br, group);
1395 if (!mp)
1396 goto out;
1397
1398 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1399 struct net_bridge_port_group __rcu **pp;
1400
1401 for (pp = &mp->ports;
1402 (p = mlock_dereference(*pp, br)) != NULL;
1403 pp = &p->next) {
1404 if (!br_port_group_equal(p, port, src))
1405 continue;
1406
1407 if (p->flags & MDB_PG_FLAGS_PERMANENT)
1408 break;
1409
1410 rcu_assign_pointer(*pp, p->next);
1411 hlist_del_init(&p->mglist);
1412 del_timer(&p->timer);
1413 kfree_rcu(p, rcu);
1414 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1415 p->flags | MDB_PG_FLAGS_FAST_LEAVE);
1416
1417 if (!mp->ports && !mp->host_joined &&
1418 netif_running(br->dev))
1419 mod_timer(&mp->timer, jiffies);
1420 }
1421 goto out;
1422 }
1423
1424 if (timer_pending(&other_query->timer))
1425 goto out;
1426
1427 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
1428 __br_multicast_send_query(br, port, &mp->addr);
1429
1430 time = jiffies + br->multicast_last_member_count *
1431 br->multicast_last_member_interval;
1432
1433 mod_timer(&own_query->timer, time);
1434
1435 for (p = mlock_dereference(mp->ports, br);
1436 p != NULL;
1437 p = mlock_dereference(p->next, br)) {
1438 if (!br_port_group_equal(p, port, src))
1439 continue;
1440
1441 if (!hlist_unhashed(&p->mglist) &&
1442 (timer_pending(&p->timer) ?
1443 time_after(p->timer.expires, time) :
1444 try_to_del_timer_sync(&p->timer) >= 0)) {
1445 mod_timer(&p->timer, time);
1446 }
1447
1448 break;
1449 }
1450 }
1451
1452 now = jiffies;
1453 time = now + br->multicast_last_member_count *
1454 br->multicast_last_member_interval;
1455
1456 if (!port) {
1457 if (mp->host_joined &&
1458 (timer_pending(&mp->timer) ?
1459 time_after(mp->timer.expires, time) :
1460 try_to_del_timer_sync(&mp->timer) >= 0)) {
1461 mod_timer(&mp->timer, time);
1462 }
1463
1464 goto out;
1465 }
1466
1467 for (p = mlock_dereference(mp->ports, br);
1468 p != NULL;
1469 p = mlock_dereference(p->next, br)) {
1470 if (p->port != port)
1471 continue;
1472
1473 if (!hlist_unhashed(&p->mglist) &&
1474 (timer_pending(&p->timer) ?
1475 time_after(p->timer.expires, time) :
1476 try_to_del_timer_sync(&p->timer) >= 0)) {
1477 mod_timer(&p->timer, time);
1478 }
1479
1480 break;
1481 }
1482 out:
1483 spin_unlock(&br->multicast_lock);
1484 }
1485
br_ip4_multicast_leave_group(struct net_bridge * br,struct net_bridge_port * port,__be32 group,__u16 vid,const unsigned char * src)1486 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1487 struct net_bridge_port *port,
1488 __be32 group,
1489 __u16 vid,
1490 const unsigned char *src)
1491 {
1492 struct br_ip br_group;
1493 struct bridge_mcast_own_query *own_query;
1494
1495 if (ipv4_is_local_multicast(group))
1496 return;
1497
1498 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1499
1500 memset(&br_group, 0, sizeof(br_group));
1501 br_group.u.ip4 = group;
1502 br_group.proto = htons(ETH_P_IP);
1503 br_group.vid = vid;
1504
1505 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1506 own_query, src);
1507 }
1508
1509 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_leave_group(struct net_bridge * br,struct net_bridge_port * port,const struct in6_addr * group,__u16 vid,const unsigned char * src)1510 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1511 struct net_bridge_port *port,
1512 const struct in6_addr *group,
1513 __u16 vid,
1514 const unsigned char *src)
1515 {
1516 struct br_ip br_group;
1517 struct bridge_mcast_own_query *own_query;
1518
1519 if (ipv6_addr_is_ll_all_nodes(group))
1520 return;
1521
1522 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1523
1524 memset(&br_group, 0, sizeof(br_group));
1525 br_group.u.ip6 = *group;
1526 br_group.proto = htons(ETH_P_IPV6);
1527 br_group.vid = vid;
1528
1529 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1530 own_query, src);
1531 }
1532 #endif
1533
br_multicast_err_count(const struct net_bridge * br,const struct net_bridge_port * p,__be16 proto)1534 static void br_multicast_err_count(const struct net_bridge *br,
1535 const struct net_bridge_port *p,
1536 __be16 proto)
1537 {
1538 struct bridge_mcast_stats __percpu *stats;
1539 struct bridge_mcast_stats *pstats;
1540
1541 if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1542 return;
1543
1544 if (p)
1545 stats = p->mcast_stats;
1546 else
1547 stats = br->mcast_stats;
1548 if (WARN_ON(!stats))
1549 return;
1550
1551 pstats = this_cpu_ptr(stats);
1552
1553 u64_stats_update_begin(&pstats->syncp);
1554 switch (proto) {
1555 case htons(ETH_P_IP):
1556 pstats->mstats.igmp_parse_errors++;
1557 break;
1558 #if IS_ENABLED(CONFIG_IPV6)
1559 case htons(ETH_P_IPV6):
1560 pstats->mstats.mld_parse_errors++;
1561 break;
1562 #endif
1563 }
1564 u64_stats_update_end(&pstats->syncp);
1565 }
1566
br_multicast_pim(struct net_bridge * br,struct net_bridge_port * port,const struct sk_buff * skb)1567 static void br_multicast_pim(struct net_bridge *br,
1568 struct net_bridge_port *port,
1569 const struct sk_buff *skb)
1570 {
1571 unsigned int offset = skb_transport_offset(skb);
1572 struct pimhdr *pimhdr, _pimhdr;
1573
1574 pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1575 if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1576 pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1577 return;
1578
1579 br_multicast_mark_router(br, port);
1580 }
1581
br_ip4_multicast_mrd_rcv(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb)1582 static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1583 struct net_bridge_port *port,
1584 struct sk_buff *skb)
1585 {
1586 if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1587 igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1588 return -ENOMSG;
1589
1590 br_multicast_mark_router(br, port);
1591
1592 return 0;
1593 }
1594
br_multicast_ipv4_rcv(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb,u16 vid)1595 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1596 struct net_bridge_port *port,
1597 struct sk_buff *skb,
1598 u16 vid)
1599 {
1600 const unsigned char *src;
1601 struct igmphdr *ih;
1602 int err;
1603
1604 err = ip_mc_check_igmp(skb);
1605
1606 if (err == -ENOMSG) {
1607 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1608 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1609 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1610 if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1611 br_multicast_pim(br, port, skb);
1612 } else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
1613 br_ip4_multicast_mrd_rcv(br, port, skb);
1614 }
1615
1616 return 0;
1617 } else if (err < 0) {
1618 br_multicast_err_count(br, port, skb->protocol);
1619 return err;
1620 }
1621
1622 ih = igmp_hdr(skb);
1623 src = eth_hdr(skb)->h_source;
1624 BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1625
1626 switch (ih->type) {
1627 case IGMP_HOST_MEMBERSHIP_REPORT:
1628 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1629 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1630 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1631 break;
1632 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1633 err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
1634 break;
1635 case IGMP_HOST_MEMBERSHIP_QUERY:
1636 br_ip4_multicast_query(br, port, skb, vid);
1637 break;
1638 case IGMP_HOST_LEAVE_MESSAGE:
1639 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1640 break;
1641 }
1642
1643 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1644 BR_MCAST_DIR_RX);
1645
1646 return err;
1647 }
1648
1649 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_mrd_rcv(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb)1650 static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1651 struct net_bridge_port *port,
1652 struct sk_buff *skb)
1653 {
1654 int ret;
1655
1656 if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1657 return -ENOMSG;
1658
1659 ret = ipv6_mc_check_icmpv6(skb);
1660 if (ret < 0)
1661 return ret;
1662
1663 if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1664 return -ENOMSG;
1665
1666 br_multicast_mark_router(br, port);
1667
1668 return 0;
1669 }
1670
br_multicast_ipv6_rcv(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb,u16 vid)1671 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1672 struct net_bridge_port *port,
1673 struct sk_buff *skb,
1674 u16 vid)
1675 {
1676 const unsigned char *src;
1677 struct mld_msg *mld;
1678 int err;
1679
1680 err = ipv6_mc_check_mld(skb);
1681
1682 if (err == -ENOMSG) {
1683 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1684 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1685
1686 if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1687 err = br_ip6_multicast_mrd_rcv(br, port, skb);
1688
1689 if (err < 0 && err != -ENOMSG) {
1690 br_multicast_err_count(br, port, skb->protocol);
1691 return err;
1692 }
1693 }
1694
1695 return 0;
1696 } else if (err < 0) {
1697 br_multicast_err_count(br, port, skb->protocol);
1698 return err;
1699 }
1700
1701 mld = (struct mld_msg *)skb_transport_header(skb);
1702 BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1703
1704 switch (mld->mld_type) {
1705 case ICMPV6_MGM_REPORT:
1706 src = eth_hdr(skb)->h_source;
1707 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1708 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1709 src);
1710 break;
1711 case ICMPV6_MLD2_REPORT:
1712 err = br_ip6_multicast_mld2_report(br, port, skb, vid);
1713 break;
1714 case ICMPV6_MGM_QUERY:
1715 err = br_ip6_multicast_query(br, port, skb, vid);
1716 break;
1717 case ICMPV6_MGM_REDUCTION:
1718 src = eth_hdr(skb)->h_source;
1719 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1720 break;
1721 }
1722
1723 br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1724 BR_MCAST_DIR_RX);
1725
1726 return err;
1727 }
1728 #endif
1729
br_multicast_rcv(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb,u16 vid)1730 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1731 struct sk_buff *skb, u16 vid)
1732 {
1733 int ret = 0;
1734
1735 BR_INPUT_SKB_CB(skb)->igmp = 0;
1736 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1737
1738 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1739 return 0;
1740
1741 switch (skb->protocol) {
1742 case htons(ETH_P_IP):
1743 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1744 break;
1745 #if IS_ENABLED(CONFIG_IPV6)
1746 case htons(ETH_P_IPV6):
1747 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1748 break;
1749 #endif
1750 }
1751
1752 return ret;
1753 }
1754
br_multicast_query_expired(struct net_bridge * br,struct bridge_mcast_own_query * query,struct bridge_mcast_querier * querier)1755 static void br_multicast_query_expired(struct net_bridge *br,
1756 struct bridge_mcast_own_query *query,
1757 struct bridge_mcast_querier *querier)
1758 {
1759 spin_lock(&br->multicast_lock);
1760 if (query->startup_sent < br->multicast_startup_query_count)
1761 query->startup_sent++;
1762
1763 RCU_INIT_POINTER(querier->port, NULL);
1764 br_multicast_send_query(br, NULL, query);
1765 spin_unlock(&br->multicast_lock);
1766 }
1767
br_ip4_multicast_query_expired(struct timer_list * t)1768 static void br_ip4_multicast_query_expired(struct timer_list *t)
1769 {
1770 struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1771
1772 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1773 }
1774
1775 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_query_expired(struct timer_list * t)1776 static void br_ip6_multicast_query_expired(struct timer_list *t)
1777 {
1778 struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1779
1780 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1781 }
1782 #endif
1783
br_multicast_init(struct net_bridge * br)1784 void br_multicast_init(struct net_bridge *br)
1785 {
1786 br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
1787
1788 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1789 br->multicast_last_member_count = 2;
1790 br->multicast_startup_query_count = 2;
1791
1792 br->multicast_last_member_interval = HZ;
1793 br->multicast_query_response_interval = 10 * HZ;
1794 br->multicast_startup_query_interval = 125 * HZ / 4;
1795 br->multicast_query_interval = 125 * HZ;
1796 br->multicast_querier_interval = 255 * HZ;
1797 br->multicast_membership_interval = 260 * HZ;
1798
1799 br->ip4_other_query.delay_time = 0;
1800 br->ip4_querier.port = NULL;
1801 br->multicast_igmp_version = 2;
1802 #if IS_ENABLED(CONFIG_IPV6)
1803 br->multicast_mld_version = 1;
1804 br->ip6_other_query.delay_time = 0;
1805 br->ip6_querier.port = NULL;
1806 #endif
1807 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
1808 br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
1809
1810 spin_lock_init(&br->multicast_lock);
1811 timer_setup(&br->multicast_router_timer,
1812 br_multicast_local_router_expired, 0);
1813 timer_setup(&br->ip4_other_query.timer,
1814 br_ip4_multicast_querier_expired, 0);
1815 timer_setup(&br->ip4_own_query.timer,
1816 br_ip4_multicast_query_expired, 0);
1817 #if IS_ENABLED(CONFIG_IPV6)
1818 timer_setup(&br->ip6_other_query.timer,
1819 br_ip6_multicast_querier_expired, 0);
1820 timer_setup(&br->ip6_own_query.timer,
1821 br_ip6_multicast_query_expired, 0);
1822 #endif
1823 INIT_HLIST_HEAD(&br->mdb_list);
1824 }
1825
br_ip4_multicast_join_snoopers(struct net_bridge * br)1826 static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1827 {
1828 struct in_device *in_dev = in_dev_get(br->dev);
1829
1830 if (!in_dev)
1831 return;
1832
1833 __ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1834 in_dev_put(in_dev);
1835 }
1836
1837 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_join_snoopers(struct net_bridge * br)1838 static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1839 {
1840 struct in6_addr addr;
1841
1842 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1843 ipv6_dev_mc_inc(br->dev, &addr);
1844 }
1845 #else
br_ip6_multicast_join_snoopers(struct net_bridge * br)1846 static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1847 {
1848 }
1849 #endif
1850
br_multicast_join_snoopers(struct net_bridge * br)1851 static void br_multicast_join_snoopers(struct net_bridge *br)
1852 {
1853 br_ip4_multicast_join_snoopers(br);
1854 br_ip6_multicast_join_snoopers(br);
1855 }
1856
br_ip4_multicast_leave_snoopers(struct net_bridge * br)1857 static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1858 {
1859 struct in_device *in_dev = in_dev_get(br->dev);
1860
1861 if (WARN_ON(!in_dev))
1862 return;
1863
1864 __ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1865 in_dev_put(in_dev);
1866 }
1867
1868 #if IS_ENABLED(CONFIG_IPV6)
br_ip6_multicast_leave_snoopers(struct net_bridge * br)1869 static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1870 {
1871 struct in6_addr addr;
1872
1873 ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1874 ipv6_dev_mc_dec(br->dev, &addr);
1875 }
1876 #else
br_ip6_multicast_leave_snoopers(struct net_bridge * br)1877 static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1878 {
1879 }
1880 #endif
1881
br_multicast_leave_snoopers(struct net_bridge * br)1882 static void br_multicast_leave_snoopers(struct net_bridge *br)
1883 {
1884 br_ip4_multicast_leave_snoopers(br);
1885 br_ip6_multicast_leave_snoopers(br);
1886 }
1887
__br_multicast_open(struct net_bridge * br,struct bridge_mcast_own_query * query)1888 static void __br_multicast_open(struct net_bridge *br,
1889 struct bridge_mcast_own_query *query)
1890 {
1891 query->startup_sent = 0;
1892
1893 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1894 return;
1895
1896 mod_timer(&query->timer, jiffies);
1897 }
1898
br_multicast_open(struct net_bridge * br)1899 void br_multicast_open(struct net_bridge *br)
1900 {
1901 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1902 br_multicast_join_snoopers(br);
1903
1904 __br_multicast_open(br, &br->ip4_own_query);
1905 #if IS_ENABLED(CONFIG_IPV6)
1906 __br_multicast_open(br, &br->ip6_own_query);
1907 #endif
1908 }
1909
br_multicast_stop(struct net_bridge * br)1910 void br_multicast_stop(struct net_bridge *br)
1911 {
1912 del_timer_sync(&br->multicast_router_timer);
1913 del_timer_sync(&br->ip4_other_query.timer);
1914 del_timer_sync(&br->ip4_own_query.timer);
1915 #if IS_ENABLED(CONFIG_IPV6)
1916 del_timer_sync(&br->ip6_other_query.timer);
1917 del_timer_sync(&br->ip6_own_query.timer);
1918 #endif
1919
1920 if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1921 br_multicast_leave_snoopers(br);
1922 }
1923
br_multicast_dev_del(struct net_bridge * br)1924 void br_multicast_dev_del(struct net_bridge *br)
1925 {
1926 struct net_bridge_mdb_entry *mp;
1927 struct hlist_node *tmp;
1928
1929 spin_lock_bh(&br->multicast_lock);
1930 hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1931 del_timer(&mp->timer);
1932 rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1933 br_mdb_rht_params);
1934 hlist_del_rcu(&mp->mdb_node);
1935 kfree_rcu(mp, rcu);
1936 }
1937 spin_unlock_bh(&br->multicast_lock);
1938
1939 rcu_barrier();
1940 }
1941
br_multicast_set_router(struct net_bridge * br,unsigned long val)1942 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1943 {
1944 int err = -EINVAL;
1945
1946 spin_lock_bh(&br->multicast_lock);
1947
1948 switch (val) {
1949 case MDB_RTR_TYPE_DISABLED:
1950 case MDB_RTR_TYPE_PERM:
1951 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
1952 del_timer(&br->multicast_router_timer);
1953 br->multicast_router = val;
1954 err = 0;
1955 break;
1956 case MDB_RTR_TYPE_TEMP_QUERY:
1957 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1958 br_mc_router_state_change(br, false);
1959 br->multicast_router = val;
1960 err = 0;
1961 break;
1962 }
1963
1964 spin_unlock_bh(&br->multicast_lock);
1965
1966 return err;
1967 }
1968
__del_port_router(struct net_bridge_port * p)1969 static void __del_port_router(struct net_bridge_port *p)
1970 {
1971 if (hlist_unhashed(&p->rlist))
1972 return;
1973 hlist_del_init_rcu(&p->rlist);
1974 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1975 br_port_mc_router_state_change(p, false);
1976
1977 /* don't allow timer refresh */
1978 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1979 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1980 }
1981
br_multicast_set_port_router(struct net_bridge_port * p,unsigned long val)1982 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1983 {
1984 struct net_bridge *br = p->br;
1985 unsigned long now = jiffies;
1986 int err = -EINVAL;
1987
1988 spin_lock(&br->multicast_lock);
1989 if (p->multicast_router == val) {
1990 /* Refresh the temp router port timer */
1991 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1992 mod_timer(&p->multicast_router_timer,
1993 now + br->multicast_querier_interval);
1994 err = 0;
1995 goto unlock;
1996 }
1997 switch (val) {
1998 case MDB_RTR_TYPE_DISABLED:
1999 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2000 __del_port_router(p);
2001 del_timer(&p->multicast_router_timer);
2002 break;
2003 case MDB_RTR_TYPE_TEMP_QUERY:
2004 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2005 __del_port_router(p);
2006 break;
2007 case MDB_RTR_TYPE_PERM:
2008 p->multicast_router = MDB_RTR_TYPE_PERM;
2009 del_timer(&p->multicast_router_timer);
2010 br_multicast_add_router(br, p);
2011 break;
2012 case MDB_RTR_TYPE_TEMP:
2013 p->multicast_router = MDB_RTR_TYPE_TEMP;
2014 br_multicast_mark_router(br, p);
2015 break;
2016 default:
2017 goto unlock;
2018 }
2019 err = 0;
2020 unlock:
2021 spin_unlock(&br->multicast_lock);
2022
2023 return err;
2024 }
2025
br_multicast_start_querier(struct net_bridge * br,struct bridge_mcast_own_query * query)2026 static void br_multicast_start_querier(struct net_bridge *br,
2027 struct bridge_mcast_own_query *query)
2028 {
2029 struct net_bridge_port *port;
2030
2031 __br_multicast_open(br, query);
2032
2033 rcu_read_lock();
2034 list_for_each_entry_rcu(port, &br->port_list, list) {
2035 if (port->state == BR_STATE_DISABLED ||
2036 port->state == BR_STATE_BLOCKING)
2037 continue;
2038
2039 if (query == &br->ip4_own_query)
2040 br_multicast_enable(&port->ip4_own_query);
2041 #if IS_ENABLED(CONFIG_IPV6)
2042 else
2043 br_multicast_enable(&port->ip6_own_query);
2044 #endif
2045 }
2046 rcu_read_unlock();
2047 }
2048
br_multicast_toggle(struct net_bridge * br,unsigned long val)2049 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2050 {
2051 struct net_bridge_port *port;
2052
2053 spin_lock_bh(&br->multicast_lock);
2054 if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
2055 goto unlock;
2056
2057 br_mc_disabled_update(br->dev, val);
2058 br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2059 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2060 br_multicast_leave_snoopers(br);
2061 goto unlock;
2062 }
2063
2064 if (!netif_running(br->dev))
2065 goto unlock;
2066
2067 br_multicast_open(br);
2068 list_for_each_entry(port, &br->port_list, list)
2069 __br_multicast_enable_port(port);
2070
2071 unlock:
2072 spin_unlock_bh(&br->multicast_lock);
2073
2074 return 0;
2075 }
2076
br_multicast_enabled(const struct net_device * dev)2077 bool br_multicast_enabled(const struct net_device *dev)
2078 {
2079 struct net_bridge *br = netdev_priv(dev);
2080
2081 return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
2082 }
2083 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2084
br_multicast_router(const struct net_device * dev)2085 bool br_multicast_router(const struct net_device *dev)
2086 {
2087 struct net_bridge *br = netdev_priv(dev);
2088 bool is_router;
2089
2090 spin_lock_bh(&br->multicast_lock);
2091 is_router = br_multicast_is_router(br);
2092 spin_unlock_bh(&br->multicast_lock);
2093 return is_router;
2094 }
2095 EXPORT_SYMBOL_GPL(br_multicast_router);
2096
br_multicast_set_querier(struct net_bridge * br,unsigned long val)2097 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2098 {
2099 unsigned long max_delay;
2100
2101 val = !!val;
2102
2103 spin_lock_bh(&br->multicast_lock);
2104 if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
2105 goto unlock;
2106
2107 br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
2108 if (!val)
2109 goto unlock;
2110
2111 max_delay = br->multicast_query_response_interval;
2112
2113 if (!timer_pending(&br->ip4_other_query.timer))
2114 br->ip4_other_query.delay_time = jiffies + max_delay;
2115
2116 br_multicast_start_querier(br, &br->ip4_own_query);
2117
2118 #if IS_ENABLED(CONFIG_IPV6)
2119 if (!timer_pending(&br->ip6_other_query.timer))
2120 br->ip6_other_query.delay_time = jiffies + max_delay;
2121
2122 br_multicast_start_querier(br, &br->ip6_own_query);
2123 #endif
2124
2125 unlock:
2126 spin_unlock_bh(&br->multicast_lock);
2127
2128 return 0;
2129 }
2130
br_multicast_set_igmp_version(struct net_bridge * br,unsigned long val)2131 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2132 {
2133 /* Currently we support only version 2 and 3 */
2134 switch (val) {
2135 case 2:
2136 case 3:
2137 break;
2138 default:
2139 return -EINVAL;
2140 }
2141
2142 spin_lock_bh(&br->multicast_lock);
2143 br->multicast_igmp_version = val;
2144 spin_unlock_bh(&br->multicast_lock);
2145
2146 return 0;
2147 }
2148
2149 #if IS_ENABLED(CONFIG_IPV6)
br_multicast_set_mld_version(struct net_bridge * br,unsigned long val)2150 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2151 {
2152 /* Currently we support version 1 and 2 */
2153 switch (val) {
2154 case 1:
2155 case 2:
2156 break;
2157 default:
2158 return -EINVAL;
2159 }
2160
2161 spin_lock_bh(&br->multicast_lock);
2162 br->multicast_mld_version = val;
2163 spin_unlock_bh(&br->multicast_lock);
2164
2165 return 0;
2166 }
2167 #endif
2168
2169 /**
2170 * br_multicast_list_adjacent - Returns snooped multicast addresses
2171 * @dev: The bridge port adjacent to which to retrieve addresses
2172 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2173 *
2174 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2175 * snooping feature on all bridge ports of dev's bridge device, excluding
2176 * the addresses from dev itself.
2177 *
2178 * Returns the number of items added to br_ip_list.
2179 *
2180 * Notes:
2181 * - br_ip_list needs to be initialized by caller
2182 * - br_ip_list might contain duplicates in the end
2183 * (needs to be taken care of by caller)
2184 * - br_ip_list needs to be freed by caller
2185 */
br_multicast_list_adjacent(struct net_device * dev,struct list_head * br_ip_list)2186 int br_multicast_list_adjacent(struct net_device *dev,
2187 struct list_head *br_ip_list)
2188 {
2189 struct net_bridge *br;
2190 struct net_bridge_port *port;
2191 struct net_bridge_port_group *group;
2192 struct br_ip_list *entry;
2193 int count = 0;
2194
2195 rcu_read_lock();
2196 if (!br_ip_list || !netif_is_bridge_port(dev))
2197 goto unlock;
2198
2199 port = br_port_get_rcu(dev);
2200 if (!port || !port->br)
2201 goto unlock;
2202
2203 br = port->br;
2204
2205 list_for_each_entry_rcu(port, &br->port_list, list) {
2206 if (!port->dev || port->dev == dev)
2207 continue;
2208
2209 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2210 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2211 if (!entry)
2212 goto unlock;
2213
2214 entry->addr = group->addr;
2215 list_add(&entry->list, br_ip_list);
2216 count++;
2217 }
2218 }
2219
2220 unlock:
2221 rcu_read_unlock();
2222 return count;
2223 }
2224 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2225
2226 /**
2227 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2228 * @dev: The bridge port providing the bridge on which to check for a querier
2229 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2230 *
2231 * Checks whether the given interface has a bridge on top and if so returns
2232 * true if a valid querier exists anywhere on the bridged link layer.
2233 * Otherwise returns false.
2234 */
br_multicast_has_querier_anywhere(struct net_device * dev,int proto)2235 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2236 {
2237 struct net_bridge *br;
2238 struct net_bridge_port *port;
2239 struct ethhdr eth;
2240 bool ret = false;
2241
2242 rcu_read_lock();
2243 if (!netif_is_bridge_port(dev))
2244 goto unlock;
2245
2246 port = br_port_get_rcu(dev);
2247 if (!port || !port->br)
2248 goto unlock;
2249
2250 br = port->br;
2251
2252 memset(ð, 0, sizeof(eth));
2253 eth.h_proto = htons(proto);
2254
2255 ret = br_multicast_querier_exists(br, ð);
2256
2257 unlock:
2258 rcu_read_unlock();
2259 return ret;
2260 }
2261 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2262
2263 /**
2264 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2265 * @dev: The bridge port adjacent to which to check for a querier
2266 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2267 *
2268 * Checks whether the given interface has a bridge on top and if so returns
2269 * true if a selected querier is behind one of the other ports of this
2270 * bridge. Otherwise returns false.
2271 */
br_multicast_has_querier_adjacent(struct net_device * dev,int proto)2272 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2273 {
2274 struct net_bridge *br;
2275 struct net_bridge_port *port;
2276 bool ret = false;
2277
2278 rcu_read_lock();
2279 if (!netif_is_bridge_port(dev))
2280 goto unlock;
2281
2282 port = br_port_get_rcu(dev);
2283 if (!port || !port->br)
2284 goto unlock;
2285
2286 br = port->br;
2287
2288 switch (proto) {
2289 case ETH_P_IP:
2290 if (!timer_pending(&br->ip4_other_query.timer) ||
2291 rcu_dereference(br->ip4_querier.port) == port)
2292 goto unlock;
2293 break;
2294 #if IS_ENABLED(CONFIG_IPV6)
2295 case ETH_P_IPV6:
2296 if (!timer_pending(&br->ip6_other_query.timer) ||
2297 rcu_dereference(br->ip6_querier.port) == port)
2298 goto unlock;
2299 break;
2300 #endif
2301 default:
2302 goto unlock;
2303 }
2304
2305 ret = true;
2306 unlock:
2307 rcu_read_unlock();
2308 return ret;
2309 }
2310 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2311
br_mcast_stats_add(struct bridge_mcast_stats __percpu * stats,const struct sk_buff * skb,u8 type,u8 dir)2312 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2313 const struct sk_buff *skb, u8 type, u8 dir)
2314 {
2315 struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2316 __be16 proto = skb->protocol;
2317 unsigned int t_len;
2318
2319 u64_stats_update_begin(&pstats->syncp);
2320 switch (proto) {
2321 case htons(ETH_P_IP):
2322 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2323 switch (type) {
2324 case IGMP_HOST_MEMBERSHIP_REPORT:
2325 pstats->mstats.igmp_v1reports[dir]++;
2326 break;
2327 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2328 pstats->mstats.igmp_v2reports[dir]++;
2329 break;
2330 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2331 pstats->mstats.igmp_v3reports[dir]++;
2332 break;
2333 case IGMP_HOST_MEMBERSHIP_QUERY:
2334 if (t_len != sizeof(struct igmphdr)) {
2335 pstats->mstats.igmp_v3queries[dir]++;
2336 } else {
2337 unsigned int offset = skb_transport_offset(skb);
2338 struct igmphdr *ih, _ihdr;
2339
2340 ih = skb_header_pointer(skb, offset,
2341 sizeof(_ihdr), &_ihdr);
2342 if (!ih)
2343 break;
2344 if (!ih->code)
2345 pstats->mstats.igmp_v1queries[dir]++;
2346 else
2347 pstats->mstats.igmp_v2queries[dir]++;
2348 }
2349 break;
2350 case IGMP_HOST_LEAVE_MESSAGE:
2351 pstats->mstats.igmp_leaves[dir]++;
2352 break;
2353 }
2354 break;
2355 #if IS_ENABLED(CONFIG_IPV6)
2356 case htons(ETH_P_IPV6):
2357 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2358 sizeof(struct ipv6hdr);
2359 t_len -= skb_network_header_len(skb);
2360 switch (type) {
2361 case ICMPV6_MGM_REPORT:
2362 pstats->mstats.mld_v1reports[dir]++;
2363 break;
2364 case ICMPV6_MLD2_REPORT:
2365 pstats->mstats.mld_v2reports[dir]++;
2366 break;
2367 case ICMPV6_MGM_QUERY:
2368 if (t_len != sizeof(struct mld_msg))
2369 pstats->mstats.mld_v2queries[dir]++;
2370 else
2371 pstats->mstats.mld_v1queries[dir]++;
2372 break;
2373 case ICMPV6_MGM_REDUCTION:
2374 pstats->mstats.mld_leaves[dir]++;
2375 break;
2376 }
2377 break;
2378 #endif /* CONFIG_IPV6 */
2379 }
2380 u64_stats_update_end(&pstats->syncp);
2381 }
2382
br_multicast_count(struct net_bridge * br,const struct net_bridge_port * p,const struct sk_buff * skb,u8 type,u8 dir)2383 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2384 const struct sk_buff *skb, u8 type, u8 dir)
2385 {
2386 struct bridge_mcast_stats __percpu *stats;
2387
2388 /* if multicast_disabled is true then igmp type can't be set */
2389 if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2390 return;
2391
2392 if (p)
2393 stats = p->mcast_stats;
2394 else
2395 stats = br->mcast_stats;
2396 if (WARN_ON(!stats))
2397 return;
2398
2399 br_mcast_stats_add(stats, skb, type, dir);
2400 }
2401
br_multicast_init_stats(struct net_bridge * br)2402 int br_multicast_init_stats(struct net_bridge *br)
2403 {
2404 br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2405 if (!br->mcast_stats)
2406 return -ENOMEM;
2407
2408 return 0;
2409 }
2410
br_multicast_uninit_stats(struct net_bridge * br)2411 void br_multicast_uninit_stats(struct net_bridge *br)
2412 {
2413 free_percpu(br->mcast_stats);
2414 }
2415
mcast_stats_add_dir(u64 * dst,u64 * src)2416 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2417 {
2418 dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2419 dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2420 }
2421
br_multicast_get_stats(const struct net_bridge * br,const struct net_bridge_port * p,struct br_mcast_stats * dest)2422 void br_multicast_get_stats(const struct net_bridge *br,
2423 const struct net_bridge_port *p,
2424 struct br_mcast_stats *dest)
2425 {
2426 struct bridge_mcast_stats __percpu *stats;
2427 struct br_mcast_stats tdst;
2428 int i;
2429
2430 memset(dest, 0, sizeof(*dest));
2431 if (p)
2432 stats = p->mcast_stats;
2433 else
2434 stats = br->mcast_stats;
2435 if (WARN_ON(!stats))
2436 return;
2437
2438 memset(&tdst, 0, sizeof(tdst));
2439 for_each_possible_cpu(i) {
2440 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2441 struct br_mcast_stats temp;
2442 unsigned int start;
2443
2444 do {
2445 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2446 memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2447 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2448
2449 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2450 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2451 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2452 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2453 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2454 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2455 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2456 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2457
2458 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2459 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2460 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2461 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2462 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2463 tdst.mld_parse_errors += temp.mld_parse_errors;
2464 }
2465 memcpy(dest, &tdst, sizeof(*dest));
2466 }
2467
br_mdb_hash_init(struct net_bridge * br)2468 int br_mdb_hash_init(struct net_bridge *br)
2469 {
2470 return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2471 }
2472
br_mdb_hash_fini(struct net_bridge * br)2473 void br_mdb_hash_fini(struct net_bridge *br)
2474 {
2475 rhashtable_destroy(&br->mdb_hash_tbl);
2476 }
2477
