2 * Bridge multicast support.
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
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)
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>
29 #if IS_ENABLED(CONFIG_IPV6)
32 #include <net/ip6_checksum.h>
33 #include <net/addrconf.h>
36 #include "br_private.h"
38 static void br_multicast_start_querier(struct net_bridge *br,
39 struct bridge_mcast_own_query *query);
40 static void br_multicast_add_router(struct net_bridge *br,
41 struct net_bridge_port *port);
42 static void br_ip4_multicast_leave_group(struct net_bridge *br,
43 struct net_bridge_port *port,
46 #if IS_ENABLED(CONFIG_IPV6)
47 static void br_ip6_multicast_leave_group(struct net_bridge *br,
48 struct net_bridge_port *port,
49 const struct in6_addr *group,
52 unsigned int br_mdb_rehash_seq;
54 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
56 if (a->proto != b->proto)
62 return a->u.ip4 == b->u.ip4;
63 #if IS_ENABLED(CONFIG_IPV6)
64 case htons(ETH_P_IPV6):
65 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
71 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
74 return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
77 #if IS_ENABLED(CONFIG_IPV6)
78 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
79 const struct in6_addr *ip,
82 return jhash_2words(ipv6_addr_hash(ip), vid,
83 mdb->secret) & (mdb->max - 1);
87 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
92 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
93 #if IS_ENABLED(CONFIG_IPV6)
94 case htons(ETH_P_IPV6):
95 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
101 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
102 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
104 struct net_bridge_mdb_entry *mp;
106 hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
107 if (br_ip_equal(&mp->addr, dst))
114 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
120 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
123 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
124 struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
129 br_dst.proto = htons(ETH_P_IP);
132 return br_mdb_ip_get(mdb, &br_dst);
135 #if IS_ENABLED(CONFIG_IPV6)
136 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
137 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
143 br_dst.proto = htons(ETH_P_IPV6);
146 return br_mdb_ip_get(mdb, &br_dst);
150 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
151 struct sk_buff *skb, u16 vid)
153 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
156 if (br->multicast_disabled)
159 if (BR_INPUT_SKB_CB(skb)->igmp)
162 ip.proto = skb->protocol;
165 switch (skb->protocol) {
166 case htons(ETH_P_IP):
167 ip.u.ip4 = ip_hdr(skb)->daddr;
169 #if IS_ENABLED(CONFIG_IPV6)
170 case htons(ETH_P_IPV6):
171 ip.u.ip6 = ipv6_hdr(skb)->daddr;
178 return br_mdb_ip_get(mdb, &ip);
181 static void br_mdb_free(struct rcu_head *head)
183 struct net_bridge_mdb_htable *mdb =
184 container_of(head, struct net_bridge_mdb_htable, rcu);
185 struct net_bridge_mdb_htable *old = mdb->old;
192 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
193 struct net_bridge_mdb_htable *old,
196 struct net_bridge_mdb_entry *mp;
201 for (i = 0; i < old->max; i++)
202 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
203 hlist_add_head(&mp->hlist[new->ver],
204 &new->mhash[br_ip_hash(new, &mp->addr)]);
210 for (i = 0; i < new->max; i++) {
212 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
218 return maxlen > elasticity ? -EINVAL : 0;
221 void br_multicast_free_pg(struct rcu_head *head)
223 struct net_bridge_port_group *p =
224 container_of(head, struct net_bridge_port_group, rcu);
229 static void br_multicast_free_group(struct rcu_head *head)
231 struct net_bridge_mdb_entry *mp =
232 container_of(head, struct net_bridge_mdb_entry, rcu);
237 static void br_multicast_group_expired(unsigned long data)
239 struct net_bridge_mdb_entry *mp = (void *)data;
240 struct net_bridge *br = mp->br;
241 struct net_bridge_mdb_htable *mdb;
243 spin_lock(&br->multicast_lock);
244 if (!netif_running(br->dev) || timer_pending(&mp->timer))
252 mdb = mlock_dereference(br->mdb, br);
254 hlist_del_rcu(&mp->hlist[mdb->ver]);
257 call_rcu_bh(&mp->rcu, br_multicast_free_group);
260 spin_unlock(&br->multicast_lock);
263 static void br_multicast_del_pg(struct net_bridge *br,
264 struct net_bridge_port_group *pg)
266 struct net_bridge_mdb_htable *mdb;
267 struct net_bridge_mdb_entry *mp;
268 struct net_bridge_port_group *p;
269 struct net_bridge_port_group __rcu **pp;
271 mdb = mlock_dereference(br->mdb, br);
273 mp = br_mdb_ip_get(mdb, &pg->addr);
277 for (pp = &mp->ports;
278 (p = mlock_dereference(*pp, br)) != NULL;
283 rcu_assign_pointer(*pp, p->next);
284 hlist_del_init(&p->mglist);
285 del_timer(&p->timer);
286 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
288 call_rcu_bh(&p->rcu, br_multicast_free_pg);
290 if (!mp->ports && !mp->mglist &&
291 netif_running(br->dev))
292 mod_timer(&mp->timer, jiffies);
300 static void br_multicast_port_group_expired(unsigned long data)
302 struct net_bridge_port_group *pg = (void *)data;
303 struct net_bridge *br = pg->port->br;
305 spin_lock(&br->multicast_lock);
306 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
307 hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
310 br_multicast_del_pg(br, pg);
313 spin_unlock(&br->multicast_lock);
316 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
319 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
320 struct net_bridge_mdb_htable *mdb;
323 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
330 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
336 mdb->size = old ? old->size : 0;
337 mdb->ver = old ? old->ver ^ 1 : 0;
339 if (!old || elasticity)
340 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
342 mdb->secret = old->secret;
347 err = br_mdb_copy(mdb, old, elasticity);
355 call_rcu_bh(&mdb->rcu, br_mdb_free);
358 rcu_assign_pointer(*mdbp, mdb);
363 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
371 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
376 skb->protocol = htons(ETH_P_IP);
378 skb_reset_mac_header(skb);
381 ether_addr_copy(eth->h_source, br->dev->dev_addr);
384 eth->h_dest[2] = 0x5e;
388 eth->h_proto = htons(ETH_P_IP);
389 skb_put(skb, sizeof(*eth));
391 skb_set_network_header(skb, skb->len);
397 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
399 iph->frag_off = htons(IP_DF);
401 iph->protocol = IPPROTO_IGMP;
402 iph->saddr = br->multicast_query_use_ifaddr ?
403 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
404 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
405 ((u8 *)&iph[1])[0] = IPOPT_RA;
406 ((u8 *)&iph[1])[1] = 4;
407 ((u8 *)&iph[1])[2] = 0;
408 ((u8 *)&iph[1])[3] = 0;
412 skb_set_transport_header(skb, skb->len);
414 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
415 ih->code = (group ? br->multicast_last_member_interval :
416 br->multicast_query_response_interval) /
417 (HZ / IGMP_TIMER_SCALE);
420 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
421 skb_put(skb, sizeof(*ih));
423 __skb_pull(skb, sizeof(*eth));
429 #if IS_ENABLED(CONFIG_IPV6)
430 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
431 const struct in6_addr *group)
434 struct ipv6hdr *ip6h;
435 struct mld_msg *mldq;
438 unsigned long interval;
440 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
445 skb->protocol = htons(ETH_P_IPV6);
447 /* Ethernet header */
448 skb_reset_mac_header(skb);
451 ether_addr_copy(eth->h_source, br->dev->dev_addr);
452 eth->h_proto = htons(ETH_P_IPV6);
453 skb_put(skb, sizeof(*eth));
455 /* IPv6 header + HbH option */
456 skb_set_network_header(skb, skb->len);
457 ip6h = ipv6_hdr(skb);
459 *(__force __be32 *)ip6h = htonl(0x60000000);
460 ip6h->payload_len = htons(8 + sizeof(*mldq));
461 ip6h->nexthdr = IPPROTO_HOPOPTS;
463 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
464 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
469 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
471 hopopt = (u8 *)(ip6h + 1);
472 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
473 hopopt[1] = 0; /* length of HbH */
474 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
475 hopopt[3] = 2; /* Length of RA Option */
476 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
478 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
479 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
481 skb_put(skb, sizeof(*ip6h) + 8);
484 skb_set_transport_header(skb, skb->len);
485 mldq = (struct mld_msg *) icmp6_hdr(skb);
487 interval = ipv6_addr_any(group) ?
488 br->multicast_query_response_interval :
489 br->multicast_last_member_interval;
491 mldq->mld_type = ICMPV6_MGM_QUERY;
494 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
495 mldq->mld_reserved = 0;
496 mldq->mld_mca = *group;
499 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
500 sizeof(*mldq), IPPROTO_ICMPV6,
503 skb_put(skb, sizeof(*mldq));
505 __skb_pull(skb, sizeof(*eth));
512 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
515 switch (addr->proto) {
516 case htons(ETH_P_IP):
517 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
518 #if IS_ENABLED(CONFIG_IPV6)
519 case htons(ETH_P_IPV6):
520 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
526 static struct net_bridge_mdb_entry *br_multicast_get_group(
527 struct net_bridge *br, struct net_bridge_port *port,
528 struct br_ip *group, int hash)
530 struct net_bridge_mdb_htable *mdb;
531 struct net_bridge_mdb_entry *mp;
532 unsigned int count = 0;
537 mdb = rcu_dereference_protected(br->mdb, 1);
538 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
540 if (unlikely(br_ip_equal(group, &mp->addr)))
547 if (unlikely(count > br->hash_elasticity && count)) {
549 br_info(br, "Multicast hash table "
550 "chain limit reached: %s\n",
551 port ? port->dev->name : br->dev->name);
553 elasticity = br->hash_elasticity;
556 if (mdb->size >= max) {
558 if (unlikely(max > br->hash_max)) {
559 br_warn(br, "Multicast hash table maximum of %d "
560 "reached, disabling snooping: %s\n",
562 port ? port->dev->name : br->dev->name);
565 br->multicast_disabled = 1;
570 if (max > mdb->max || elasticity) {
573 br_info(br, "Multicast hash table "
575 port ? port->dev->name : br->dev->name);
580 err = br_mdb_rehash(&br->mdb, max, elasticity);
582 br_warn(br, "Cannot rehash multicast "
583 "hash table, disabling snooping: %s, %d, %d\n",
584 port ? port->dev->name : br->dev->name,
600 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
601 struct net_bridge_port *port, struct br_ip *group)
603 struct net_bridge_mdb_htable *mdb;
604 struct net_bridge_mdb_entry *mp;
608 mdb = rcu_dereference_protected(br->mdb, 1);
610 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
616 hash = br_ip_hash(mdb, group);
617 mp = br_multicast_get_group(br, port, group, hash);
618 switch (PTR_ERR(mp)) {
624 mdb = rcu_dereference_protected(br->mdb, 1);
625 hash = br_ip_hash(mdb, group);
632 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
634 return ERR_PTR(-ENOMEM);
638 setup_timer(&mp->timer, br_multicast_group_expired,
641 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
648 struct net_bridge_port_group *br_multicast_new_port_group(
649 struct net_bridge_port *port,
651 struct net_bridge_port_group __rcu *next,
654 struct net_bridge_port_group *p;
656 p = kzalloc(sizeof(*p), GFP_ATOMIC);
663 rcu_assign_pointer(p->next, next);
664 hlist_add_head(&p->mglist, &port->mglist);
665 setup_timer(&p->timer, br_multicast_port_group_expired,
670 static int br_multicast_add_group(struct net_bridge *br,
671 struct net_bridge_port *port,
674 struct net_bridge_mdb_entry *mp;
675 struct net_bridge_port_group *p;
676 struct net_bridge_port_group __rcu **pp;
677 unsigned long now = jiffies;
680 spin_lock(&br->multicast_lock);
681 if (!netif_running(br->dev) ||
682 (port && port->state == BR_STATE_DISABLED))
685 mp = br_multicast_new_group(br, port, group);
692 mod_timer(&mp->timer, now + br->multicast_membership_interval);
696 for (pp = &mp->ports;
697 (p = mlock_dereference(*pp, br)) != NULL;
701 if ((unsigned long)p->port < (unsigned long)port)
705 p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
708 rcu_assign_pointer(*pp, p);
709 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, MDB_TEMPORARY);
712 mod_timer(&p->timer, now + br->multicast_membership_interval);
717 spin_unlock(&br->multicast_lock);
721 static int br_ip4_multicast_add_group(struct net_bridge *br,
722 struct net_bridge_port *port,
726 struct br_ip br_group;
728 if (ipv4_is_local_multicast(group))
731 br_group.u.ip4 = group;
732 br_group.proto = htons(ETH_P_IP);
735 return br_multicast_add_group(br, port, &br_group);
738 #if IS_ENABLED(CONFIG_IPV6)
739 static int br_ip6_multicast_add_group(struct net_bridge *br,
740 struct net_bridge_port *port,
741 const struct in6_addr *group,
744 struct br_ip br_group;
746 if (ipv6_addr_is_ll_all_nodes(group))
749 br_group.u.ip6 = *group;
750 br_group.proto = htons(ETH_P_IPV6);
753 return br_multicast_add_group(br, port, &br_group);
757 static void br_multicast_router_expired(unsigned long data)
759 struct net_bridge_port *port = (void *)data;
760 struct net_bridge *br = port->br;
762 spin_lock(&br->multicast_lock);
763 if (port->multicast_router != 1 ||
764 timer_pending(&port->multicast_router_timer) ||
765 hlist_unhashed(&port->rlist))
768 hlist_del_init_rcu(&port->rlist);
769 br_rtr_notify(br->dev, port, RTM_DELMDB);
772 spin_unlock(&br->multicast_lock);
775 static void br_multicast_local_router_expired(unsigned long data)
779 static void br_multicast_querier_expired(struct net_bridge *br,
780 struct bridge_mcast_own_query *query)
782 spin_lock(&br->multicast_lock);
783 if (!netif_running(br->dev) || br->multicast_disabled)
786 br_multicast_start_querier(br, query);
789 spin_unlock(&br->multicast_lock);
792 static void br_ip4_multicast_querier_expired(unsigned long data)
794 struct net_bridge *br = (void *)data;
796 br_multicast_querier_expired(br, &br->ip4_own_query);
799 #if IS_ENABLED(CONFIG_IPV6)
800 static void br_ip6_multicast_querier_expired(unsigned long data)
802 struct net_bridge *br = (void *)data;
804 br_multicast_querier_expired(br, &br->ip6_own_query);
808 static void br_multicast_select_own_querier(struct net_bridge *br,
812 if (ip->proto == htons(ETH_P_IP))
813 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
814 #if IS_ENABLED(CONFIG_IPV6)
816 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
820 static void __br_multicast_send_query(struct net_bridge *br,
821 struct net_bridge_port *port,
826 skb = br_multicast_alloc_query(br, ip);
831 skb->dev = port->dev;
832 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
833 dev_net(port->dev), NULL, skb, NULL, skb->dev,
834 br_dev_queue_push_xmit);
836 br_multicast_select_own_querier(br, ip, skb);
841 static void br_multicast_send_query(struct net_bridge *br,
842 struct net_bridge_port *port,
843 struct bridge_mcast_own_query *own_query)
846 struct br_ip br_group;
847 struct bridge_mcast_other_query *other_query = NULL;
849 if (!netif_running(br->dev) || br->multicast_disabled ||
850 !br->multicast_querier)
853 memset(&br_group.u, 0, sizeof(br_group.u));
855 if (port ? (own_query == &port->ip4_own_query) :
856 (own_query == &br->ip4_own_query)) {
857 other_query = &br->ip4_other_query;
858 br_group.proto = htons(ETH_P_IP);
859 #if IS_ENABLED(CONFIG_IPV6)
861 other_query = &br->ip6_other_query;
862 br_group.proto = htons(ETH_P_IPV6);
866 if (!other_query || timer_pending(&other_query->timer))
869 __br_multicast_send_query(br, port, &br_group);
872 time += own_query->startup_sent < br->multicast_startup_query_count ?
873 br->multicast_startup_query_interval :
874 br->multicast_query_interval;
875 mod_timer(&own_query->timer, time);
879 br_multicast_port_query_expired(struct net_bridge_port *port,
880 struct bridge_mcast_own_query *query)
882 struct net_bridge *br = port->br;
884 spin_lock(&br->multicast_lock);
885 if (port->state == BR_STATE_DISABLED ||
886 port->state == BR_STATE_BLOCKING)
889 if (query->startup_sent < br->multicast_startup_query_count)
890 query->startup_sent++;
892 br_multicast_send_query(port->br, port, query);
895 spin_unlock(&br->multicast_lock);
898 static void br_ip4_multicast_port_query_expired(unsigned long data)
900 struct net_bridge_port *port = (void *)data;
902 br_multicast_port_query_expired(port, &port->ip4_own_query);
905 #if IS_ENABLED(CONFIG_IPV6)
906 static void br_ip6_multicast_port_query_expired(unsigned long data)
908 struct net_bridge_port *port = (void *)data;
910 br_multicast_port_query_expired(port, &port->ip6_own_query);
914 void br_multicast_add_port(struct net_bridge_port *port)
916 port->multicast_router = 1;
918 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
919 (unsigned long)port);
920 setup_timer(&port->ip4_own_query.timer,
921 br_ip4_multicast_port_query_expired, (unsigned long)port);
922 #if IS_ENABLED(CONFIG_IPV6)
923 setup_timer(&port->ip6_own_query.timer,
924 br_ip6_multicast_port_query_expired, (unsigned long)port);
928 void br_multicast_del_port(struct net_bridge_port *port)
930 struct net_bridge *br = port->br;
931 struct net_bridge_port_group *pg;
932 struct hlist_node *n;
934 /* Take care of the remaining groups, only perm ones should be left */
935 spin_lock_bh(&br->multicast_lock);
936 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
937 br_multicast_del_pg(br, pg);
938 spin_unlock_bh(&br->multicast_lock);
939 del_timer_sync(&port->multicast_router_timer);
942 static void br_multicast_enable(struct bridge_mcast_own_query *query)
944 query->startup_sent = 0;
946 if (try_to_del_timer_sync(&query->timer) >= 0 ||
947 del_timer(&query->timer))
948 mod_timer(&query->timer, jiffies);
951 void br_multicast_enable_port(struct net_bridge_port *port)
953 struct net_bridge *br = port->br;
955 spin_lock(&br->multicast_lock);
956 if (br->multicast_disabled || !netif_running(br->dev))
959 br_multicast_enable(&port->ip4_own_query);
960 #if IS_ENABLED(CONFIG_IPV6)
961 br_multicast_enable(&port->ip6_own_query);
963 if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
964 br_multicast_add_router(br, port);
967 spin_unlock(&br->multicast_lock);
970 void br_multicast_disable_port(struct net_bridge_port *port)
972 struct net_bridge *br = port->br;
973 struct net_bridge_port_group *pg;
974 struct hlist_node *n;
976 spin_lock(&br->multicast_lock);
977 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
978 if (pg->state == MDB_TEMPORARY)
979 br_multicast_del_pg(br, pg);
981 if (!hlist_unhashed(&port->rlist)) {
982 hlist_del_init_rcu(&port->rlist);
983 br_rtr_notify(br->dev, port, RTM_DELMDB);
985 del_timer(&port->multicast_router_timer);
986 del_timer(&port->ip4_own_query.timer);
987 #if IS_ENABLED(CONFIG_IPV6)
988 del_timer(&port->ip6_own_query.timer);
990 spin_unlock(&br->multicast_lock);
993 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
994 struct net_bridge_port *port,
998 struct igmpv3_report *ih;
999 struct igmpv3_grec *grec;
1007 ih = igmpv3_report_hdr(skb);
1008 num = ntohs(ih->ngrec);
1009 len = skb_transport_offset(skb) + sizeof(*ih);
1011 for (i = 0; i < num; i++) {
1012 len += sizeof(*grec);
1013 if (!pskb_may_pull(skb, len))
1016 grec = (void *)(skb->data + len - sizeof(*grec));
1017 group = grec->grec_mca;
1018 type = grec->grec_type;
1020 len += ntohs(grec->grec_nsrcs) * 4;
1021 if (!pskb_may_pull(skb, len))
1024 /* We treat this as an IGMPv2 report for now. */
1026 case IGMPV3_MODE_IS_INCLUDE:
1027 case IGMPV3_MODE_IS_EXCLUDE:
1028 case IGMPV3_CHANGE_TO_INCLUDE:
1029 case IGMPV3_CHANGE_TO_EXCLUDE:
1030 case IGMPV3_ALLOW_NEW_SOURCES:
1031 case IGMPV3_BLOCK_OLD_SOURCES:
1038 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1039 type == IGMPV3_MODE_IS_INCLUDE) &&
1040 ntohs(grec->grec_nsrcs) == 0) {
1041 br_ip4_multicast_leave_group(br, port, group, vid);
1043 err = br_ip4_multicast_add_group(br, port, group, vid);
1052 #if IS_ENABLED(CONFIG_IPV6)
1053 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1054 struct net_bridge_port *port,
1055 struct sk_buff *skb,
1058 struct icmp6hdr *icmp6h;
1059 struct mld2_grec *grec;
1065 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1068 icmp6h = icmp6_hdr(skb);
1069 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1070 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1072 for (i = 0; i < num; i++) {
1073 __be16 *nsrcs, _nsrcs;
1075 nsrcs = skb_header_pointer(skb,
1076 len + offsetof(struct mld2_grec,
1078 sizeof(_nsrcs), &_nsrcs);
1082 if (!pskb_may_pull(skb,
1083 len + sizeof(*grec) +
1084 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1087 grec = (struct mld2_grec *)(skb->data + len);
1088 len += sizeof(*grec) +
1089 sizeof(struct in6_addr) * ntohs(*nsrcs);
1091 /* We treat these as MLDv1 reports for now. */
1092 switch (grec->grec_type) {
1093 case MLD2_MODE_IS_INCLUDE:
1094 case MLD2_MODE_IS_EXCLUDE:
1095 case MLD2_CHANGE_TO_INCLUDE:
1096 case MLD2_CHANGE_TO_EXCLUDE:
1097 case MLD2_ALLOW_NEW_SOURCES:
1098 case MLD2_BLOCK_OLD_SOURCES:
1105 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1106 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1107 ntohs(*nsrcs) == 0) {
1108 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1111 err = br_ip6_multicast_add_group(br, port,
1112 &grec->grec_mca, vid);
1122 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1123 struct net_bridge_port *port,
1126 if (!timer_pending(&br->ip4_own_query.timer) &&
1127 !timer_pending(&br->ip4_other_query.timer))
1130 if (!br->ip4_querier.addr.u.ip4)
1133 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1139 br->ip4_querier.addr.u.ip4 = saddr;
1141 /* update protected by general multicast_lock by caller */
1142 rcu_assign_pointer(br->ip4_querier.port, port);
1147 #if IS_ENABLED(CONFIG_IPV6)
1148 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1149 struct net_bridge_port *port,
1150 struct in6_addr *saddr)
1152 if (!timer_pending(&br->ip6_own_query.timer) &&
1153 !timer_pending(&br->ip6_other_query.timer))
1156 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1162 br->ip6_querier.addr.u.ip6 = *saddr;
1164 /* update protected by general multicast_lock by caller */
1165 rcu_assign_pointer(br->ip6_querier.port, port);
1171 static bool br_multicast_select_querier(struct net_bridge *br,
1172 struct net_bridge_port *port,
1173 struct br_ip *saddr)
1175 switch (saddr->proto) {
1176 case htons(ETH_P_IP):
1177 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1178 #if IS_ENABLED(CONFIG_IPV6)
1179 case htons(ETH_P_IPV6):
1180 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1188 br_multicast_update_query_timer(struct net_bridge *br,
1189 struct bridge_mcast_other_query *query,
1190 unsigned long max_delay)
1192 if (!timer_pending(&query->timer))
1193 query->delay_time = jiffies + max_delay;
1195 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1199 * Add port to router_list
1200 * list is maintained ordered by pointer value
1201 * and locked by br->multicast_lock and RCU
1203 static void br_multicast_add_router(struct net_bridge *br,
1204 struct net_bridge_port *port)
1206 struct net_bridge_port *p;
1207 struct hlist_node *slot = NULL;
1209 if (!hlist_unhashed(&port->rlist))
1212 hlist_for_each_entry(p, &br->router_list, rlist) {
1213 if ((unsigned long) port >= (unsigned long) p)
1219 hlist_add_behind_rcu(&port->rlist, slot);
1221 hlist_add_head_rcu(&port->rlist, &br->router_list);
1222 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1225 static void br_multicast_mark_router(struct net_bridge *br,
1226 struct net_bridge_port *port)
1228 unsigned long now = jiffies;
1231 if (br->multicast_router == 1)
1232 mod_timer(&br->multicast_router_timer,
1233 now + br->multicast_querier_interval);
1237 if (port->multicast_router != 1)
1240 br_multicast_add_router(br, port);
1242 mod_timer(&port->multicast_router_timer,
1243 now + br->multicast_querier_interval);
1246 static void br_multicast_query_received(struct net_bridge *br,
1247 struct net_bridge_port *port,
1248 struct bridge_mcast_other_query *query,
1249 struct br_ip *saddr,
1250 unsigned long max_delay)
1252 if (!br_multicast_select_querier(br, port, saddr))
1255 br_multicast_update_query_timer(br, query, max_delay);
1256 br_multicast_mark_router(br, port);
1259 static int br_ip4_multicast_query(struct net_bridge *br,
1260 struct net_bridge_port *port,
1261 struct sk_buff *skb,
1264 const struct iphdr *iph = ip_hdr(skb);
1265 struct igmphdr *ih = igmp_hdr(skb);
1266 struct net_bridge_mdb_entry *mp;
1267 struct igmpv3_query *ih3;
1268 struct net_bridge_port_group *p;
1269 struct net_bridge_port_group __rcu **pp;
1271 unsigned long max_delay;
1272 unsigned long now = jiffies;
1276 spin_lock(&br->multicast_lock);
1277 if (!netif_running(br->dev) ||
1278 (port && port->state == BR_STATE_DISABLED))
1283 if (skb->len == sizeof(*ih)) {
1284 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1287 max_delay = 10 * HZ;
1290 } else if (skb->len >= sizeof(*ih3)) {
1291 ih3 = igmpv3_query_hdr(skb);
1295 max_delay = ih3->code ?
1296 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1302 saddr.proto = htons(ETH_P_IP);
1303 saddr.u.ip4 = iph->saddr;
1305 br_multicast_query_received(br, port, &br->ip4_other_query,
1310 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1314 max_delay *= br->multicast_last_member_count;
1317 (timer_pending(&mp->timer) ?
1318 time_after(mp->timer.expires, now + max_delay) :
1319 try_to_del_timer_sync(&mp->timer) >= 0))
1320 mod_timer(&mp->timer, now + max_delay);
1322 for (pp = &mp->ports;
1323 (p = mlock_dereference(*pp, br)) != NULL;
1325 if (timer_pending(&p->timer) ?
1326 time_after(p->timer.expires, now + max_delay) :
1327 try_to_del_timer_sync(&p->timer) >= 0)
1328 mod_timer(&p->timer, now + max_delay);
1332 spin_unlock(&br->multicast_lock);
1336 #if IS_ENABLED(CONFIG_IPV6)
1337 static int br_ip6_multicast_query(struct net_bridge *br,
1338 struct net_bridge_port *port,
1339 struct sk_buff *skb,
1342 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1343 struct mld_msg *mld;
1344 struct net_bridge_mdb_entry *mp;
1345 struct mld2_query *mld2q;
1346 struct net_bridge_port_group *p;
1347 struct net_bridge_port_group __rcu **pp;
1349 unsigned long max_delay;
1350 unsigned long now = jiffies;
1351 const struct in6_addr *group = NULL;
1352 bool is_general_query;
1355 spin_lock(&br->multicast_lock);
1356 if (!netif_running(br->dev) ||
1357 (port && port->state == BR_STATE_DISABLED))
1360 if (skb->len == sizeof(*mld)) {
1361 if (!pskb_may_pull(skb, sizeof(*mld))) {
1365 mld = (struct mld_msg *) icmp6_hdr(skb);
1366 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1368 group = &mld->mld_mca;
1370 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1374 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1375 if (!mld2q->mld2q_nsrcs)
1376 group = &mld2q->mld2q_mca;
1378 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1381 is_general_query = group && ipv6_addr_any(group);
1383 if (is_general_query) {
1384 saddr.proto = htons(ETH_P_IPV6);
1385 saddr.u.ip6 = ip6h->saddr;
1387 br_multicast_query_received(br, port, &br->ip6_other_query,
1390 } else if (!group) {
1394 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1398 max_delay *= br->multicast_last_member_count;
1400 (timer_pending(&mp->timer) ?
1401 time_after(mp->timer.expires, now + max_delay) :
1402 try_to_del_timer_sync(&mp->timer) >= 0))
1403 mod_timer(&mp->timer, now + max_delay);
1405 for (pp = &mp->ports;
1406 (p = mlock_dereference(*pp, br)) != NULL;
1408 if (timer_pending(&p->timer) ?
1409 time_after(p->timer.expires, now + max_delay) :
1410 try_to_del_timer_sync(&p->timer) >= 0)
1411 mod_timer(&p->timer, now + max_delay);
1415 spin_unlock(&br->multicast_lock);
1421 br_multicast_leave_group(struct net_bridge *br,
1422 struct net_bridge_port *port,
1423 struct br_ip *group,
1424 struct bridge_mcast_other_query *other_query,
1425 struct bridge_mcast_own_query *own_query)
1427 struct net_bridge_mdb_htable *mdb;
1428 struct net_bridge_mdb_entry *mp;
1429 struct net_bridge_port_group *p;
1433 spin_lock(&br->multicast_lock);
1434 if (!netif_running(br->dev) ||
1435 (port && port->state == BR_STATE_DISABLED))
1438 mdb = mlock_dereference(br->mdb, br);
1439 mp = br_mdb_ip_get(mdb, group);
1443 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1444 struct net_bridge_port_group __rcu **pp;
1446 for (pp = &mp->ports;
1447 (p = mlock_dereference(*pp, br)) != NULL;
1449 if (p->port != port)
1452 rcu_assign_pointer(*pp, p->next);
1453 hlist_del_init(&p->mglist);
1454 del_timer(&p->timer);
1455 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1456 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1459 if (!mp->ports && !mp->mglist &&
1460 netif_running(br->dev))
1461 mod_timer(&mp->timer, jiffies);
1466 if (timer_pending(&other_query->timer))
1469 if (br->multicast_querier) {
1470 __br_multicast_send_query(br, port, &mp->addr);
1472 time = jiffies + br->multicast_last_member_count *
1473 br->multicast_last_member_interval;
1475 mod_timer(&own_query->timer, time);
1477 for (p = mlock_dereference(mp->ports, br);
1479 p = mlock_dereference(p->next, br)) {
1480 if (p->port != port)
1483 if (!hlist_unhashed(&p->mglist) &&
1484 (timer_pending(&p->timer) ?
1485 time_after(p->timer.expires, time) :
1486 try_to_del_timer_sync(&p->timer) >= 0)) {
1487 mod_timer(&p->timer, time);
1495 time = now + br->multicast_last_member_count *
1496 br->multicast_last_member_interval;
1500 (timer_pending(&mp->timer) ?
1501 time_after(mp->timer.expires, time) :
1502 try_to_del_timer_sync(&mp->timer) >= 0)) {
1503 mod_timer(&mp->timer, time);
1509 for (p = mlock_dereference(mp->ports, br);
1511 p = mlock_dereference(p->next, br)) {
1512 if (p->port != port)
1515 if (!hlist_unhashed(&p->mglist) &&
1516 (timer_pending(&p->timer) ?
1517 time_after(p->timer.expires, time) :
1518 try_to_del_timer_sync(&p->timer) >= 0)) {
1519 mod_timer(&p->timer, time);
1525 spin_unlock(&br->multicast_lock);
1528 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1529 struct net_bridge_port *port,
1533 struct br_ip br_group;
1534 struct bridge_mcast_own_query *own_query;
1536 if (ipv4_is_local_multicast(group))
1539 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1541 br_group.u.ip4 = group;
1542 br_group.proto = htons(ETH_P_IP);
1545 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1549 #if IS_ENABLED(CONFIG_IPV6)
1550 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1551 struct net_bridge_port *port,
1552 const struct in6_addr *group,
1555 struct br_ip br_group;
1556 struct bridge_mcast_own_query *own_query;
1558 if (ipv6_addr_is_ll_all_nodes(group))
1561 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1563 br_group.u.ip6 = *group;
1564 br_group.proto = htons(ETH_P_IPV6);
1567 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1572 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1573 struct net_bridge_port *port,
1574 struct sk_buff *skb,
1577 struct sk_buff *skb_trimmed = NULL;
1581 err = ip_mc_check_igmp(skb, &skb_trimmed);
1583 if (err == -ENOMSG) {
1584 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1585 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1587 } else if (err < 0) {
1591 BR_INPUT_SKB_CB(skb)->igmp = 1;
1595 case IGMP_HOST_MEMBERSHIP_REPORT:
1596 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1597 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1598 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1600 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1601 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1603 case IGMP_HOST_MEMBERSHIP_QUERY:
1604 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1606 case IGMP_HOST_LEAVE_MESSAGE:
1607 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1611 if (skb_trimmed && skb_trimmed != skb)
1612 kfree_skb(skb_trimmed);
1617 #if IS_ENABLED(CONFIG_IPV6)
1618 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1619 struct net_bridge_port *port,
1620 struct sk_buff *skb,
1623 struct sk_buff *skb_trimmed = NULL;
1624 struct mld_msg *mld;
1627 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1629 if (err == -ENOMSG) {
1630 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1631 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1633 } else if (err < 0) {
1637 BR_INPUT_SKB_CB(skb)->igmp = 1;
1638 mld = (struct mld_msg *)skb_transport_header(skb);
1640 switch (mld->mld_type) {
1641 case ICMPV6_MGM_REPORT:
1642 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1643 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1645 case ICMPV6_MLD2_REPORT:
1646 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1648 case ICMPV6_MGM_QUERY:
1649 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1651 case ICMPV6_MGM_REDUCTION:
1652 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1656 if (skb_trimmed && skb_trimmed != skb)
1657 kfree_skb(skb_trimmed);
1663 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1664 struct sk_buff *skb, u16 vid)
1666 BR_INPUT_SKB_CB(skb)->igmp = 0;
1667 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1669 if (br->multicast_disabled)
1672 switch (skb->protocol) {
1673 case htons(ETH_P_IP):
1674 return br_multicast_ipv4_rcv(br, port, skb, vid);
1675 #if IS_ENABLED(CONFIG_IPV6)
1676 case htons(ETH_P_IPV6):
1677 return br_multicast_ipv6_rcv(br, port, skb, vid);
1684 static void br_multicast_query_expired(struct net_bridge *br,
1685 struct bridge_mcast_own_query *query,
1686 struct bridge_mcast_querier *querier)
1688 spin_lock(&br->multicast_lock);
1689 if (query->startup_sent < br->multicast_startup_query_count)
1690 query->startup_sent++;
1692 RCU_INIT_POINTER(querier->port, NULL);
1693 br_multicast_send_query(br, NULL, query);
1694 spin_unlock(&br->multicast_lock);
1697 static void br_ip4_multicast_query_expired(unsigned long data)
1699 struct net_bridge *br = (void *)data;
1701 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1704 #if IS_ENABLED(CONFIG_IPV6)
1705 static void br_ip6_multicast_query_expired(unsigned long data)
1707 struct net_bridge *br = (void *)data;
1709 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1713 void br_multicast_init(struct net_bridge *br)
1715 br->hash_elasticity = 4;
1718 br->multicast_router = 1;
1719 br->multicast_querier = 0;
1720 br->multicast_query_use_ifaddr = 0;
1721 br->multicast_last_member_count = 2;
1722 br->multicast_startup_query_count = 2;
1724 br->multicast_last_member_interval = HZ;
1725 br->multicast_query_response_interval = 10 * HZ;
1726 br->multicast_startup_query_interval = 125 * HZ / 4;
1727 br->multicast_query_interval = 125 * HZ;
1728 br->multicast_querier_interval = 255 * HZ;
1729 br->multicast_membership_interval = 260 * HZ;
1731 br->ip4_other_query.delay_time = 0;
1732 br->ip4_querier.port = NULL;
1733 #if IS_ENABLED(CONFIG_IPV6)
1734 br->ip6_other_query.delay_time = 0;
1735 br->ip6_querier.port = NULL;
1738 spin_lock_init(&br->multicast_lock);
1739 setup_timer(&br->multicast_router_timer,
1740 br_multicast_local_router_expired, 0);
1741 setup_timer(&br->ip4_other_query.timer,
1742 br_ip4_multicast_querier_expired, (unsigned long)br);
1743 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1745 #if IS_ENABLED(CONFIG_IPV6)
1746 setup_timer(&br->ip6_other_query.timer,
1747 br_ip6_multicast_querier_expired, (unsigned long)br);
1748 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1753 static void __br_multicast_open(struct net_bridge *br,
1754 struct bridge_mcast_own_query *query)
1756 query->startup_sent = 0;
1758 if (br->multicast_disabled)
1761 mod_timer(&query->timer, jiffies);
1764 void br_multicast_open(struct net_bridge *br)
1766 __br_multicast_open(br, &br->ip4_own_query);
1767 #if IS_ENABLED(CONFIG_IPV6)
1768 __br_multicast_open(br, &br->ip6_own_query);
1772 void br_multicast_stop(struct net_bridge *br)
1774 del_timer_sync(&br->multicast_router_timer);
1775 del_timer_sync(&br->ip4_other_query.timer);
1776 del_timer_sync(&br->ip4_own_query.timer);
1777 #if IS_ENABLED(CONFIG_IPV6)
1778 del_timer_sync(&br->ip6_other_query.timer);
1779 del_timer_sync(&br->ip6_own_query.timer);
1783 void br_multicast_dev_del(struct net_bridge *br)
1785 struct net_bridge_mdb_htable *mdb;
1786 struct net_bridge_mdb_entry *mp;
1787 struct hlist_node *n;
1791 spin_lock_bh(&br->multicast_lock);
1792 mdb = mlock_dereference(br->mdb, br);
1799 for (i = 0; i < mdb->max; i++) {
1800 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1802 del_timer(&mp->timer);
1803 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1808 spin_unlock_bh(&br->multicast_lock);
1810 spin_lock_bh(&br->multicast_lock);
1815 call_rcu_bh(&mdb->rcu, br_mdb_free);
1818 spin_unlock_bh(&br->multicast_lock);
1821 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1825 spin_lock_bh(&br->multicast_lock);
1830 del_timer(&br->multicast_router_timer);
1833 br->multicast_router = val;
1838 spin_unlock_bh(&br->multicast_lock);
1843 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1845 struct net_bridge *br = p->br;
1848 spin_lock(&br->multicast_lock);
1854 p->multicast_router = val;
1857 if (val < 2 && !hlist_unhashed(&p->rlist)) {
1858 hlist_del_init_rcu(&p->rlist);
1859 br_rtr_notify(br->dev, p, RTM_DELMDB);
1865 del_timer(&p->multicast_router_timer);
1870 br_multicast_add_router(br, p);
1874 spin_unlock(&br->multicast_lock);
1879 static void br_multicast_start_querier(struct net_bridge *br,
1880 struct bridge_mcast_own_query *query)
1882 struct net_bridge_port *port;
1884 __br_multicast_open(br, query);
1886 list_for_each_entry(port, &br->port_list, list) {
1887 if (port->state == BR_STATE_DISABLED ||
1888 port->state == BR_STATE_BLOCKING)
1891 if (query == &br->ip4_own_query)
1892 br_multicast_enable(&port->ip4_own_query);
1893 #if IS_ENABLED(CONFIG_IPV6)
1895 br_multicast_enable(&port->ip6_own_query);
1900 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1903 struct net_bridge_mdb_htable *mdb;
1905 spin_lock_bh(&br->multicast_lock);
1906 if (br->multicast_disabled == !val)
1909 br->multicast_disabled = !val;
1910 if (br->multicast_disabled)
1913 if (!netif_running(br->dev))
1916 mdb = mlock_dereference(br->mdb, br);
1921 br->multicast_disabled = !!val;
1925 err = br_mdb_rehash(&br->mdb, mdb->max,
1926 br->hash_elasticity);
1931 br_multicast_start_querier(br, &br->ip4_own_query);
1932 #if IS_ENABLED(CONFIG_IPV6)
1933 br_multicast_start_querier(br, &br->ip6_own_query);
1937 spin_unlock_bh(&br->multicast_lock);
1942 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1944 unsigned long max_delay;
1948 spin_lock_bh(&br->multicast_lock);
1949 if (br->multicast_querier == val)
1952 br->multicast_querier = val;
1956 max_delay = br->multicast_query_response_interval;
1958 if (!timer_pending(&br->ip4_other_query.timer))
1959 br->ip4_other_query.delay_time = jiffies + max_delay;
1961 br_multicast_start_querier(br, &br->ip4_own_query);
1963 #if IS_ENABLED(CONFIG_IPV6)
1964 if (!timer_pending(&br->ip6_other_query.timer))
1965 br->ip6_other_query.delay_time = jiffies + max_delay;
1967 br_multicast_start_querier(br, &br->ip6_own_query);
1971 spin_unlock_bh(&br->multicast_lock);
1976 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1980 struct net_bridge_mdb_htable *mdb;
1982 spin_lock_bh(&br->multicast_lock);
1983 if (!is_power_of_2(val))
1986 mdb = mlock_dereference(br->mdb, br);
1987 if (mdb && val < mdb->size)
2003 err = br_mdb_rehash(&br->mdb, br->hash_max,
2004 br->hash_elasticity);
2010 spin_unlock_bh(&br->multicast_lock);
2016 * br_multicast_list_adjacent - Returns snooped multicast addresses
2017 * @dev: The bridge port adjacent to which to retrieve addresses
2018 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2020 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2021 * snooping feature on all bridge ports of dev's bridge device, excluding
2022 * the addresses from dev itself.
2024 * Returns the number of items added to br_ip_list.
2027 * - br_ip_list needs to be initialized by caller
2028 * - br_ip_list might contain duplicates in the end
2029 * (needs to be taken care of by caller)
2030 * - br_ip_list needs to be freed by caller
2032 int br_multicast_list_adjacent(struct net_device *dev,
2033 struct list_head *br_ip_list)
2035 struct net_bridge *br;
2036 struct net_bridge_port *port;
2037 struct net_bridge_port_group *group;
2038 struct br_ip_list *entry;
2042 if (!br_ip_list || !br_port_exists(dev))
2045 port = br_port_get_rcu(dev);
2046 if (!port || !port->br)
2051 list_for_each_entry_rcu(port, &br->port_list, list) {
2052 if (!port->dev || port->dev == dev)
2055 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2056 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2060 entry->addr = group->addr;
2061 list_add(&entry->list, br_ip_list);
2070 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2073 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2074 * @dev: The bridge port providing the bridge on which to check for a querier
2075 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2077 * Checks whether the given interface has a bridge on top and if so returns
2078 * true if a valid querier exists anywhere on the bridged link layer.
2079 * Otherwise returns false.
2081 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2083 struct net_bridge *br;
2084 struct net_bridge_port *port;
2089 if (!br_port_exists(dev))
2092 port = br_port_get_rcu(dev);
2093 if (!port || !port->br)
2098 memset(ð, 0, sizeof(eth));
2099 eth.h_proto = htons(proto);
2101 ret = br_multicast_querier_exists(br, ð);
2107 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2110 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2111 * @dev: The bridge port adjacent to which to check for a querier
2112 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2114 * Checks whether the given interface has a bridge on top and if so returns
2115 * true if a selected querier is behind one of the other ports of this
2116 * bridge. Otherwise returns false.
2118 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2120 struct net_bridge *br;
2121 struct net_bridge_port *port;
2125 if (!br_port_exists(dev))
2128 port = br_port_get_rcu(dev);
2129 if (!port || !port->br)
2136 if (!timer_pending(&br->ip4_other_query.timer) ||
2137 rcu_dereference(br->ip4_querier.port) == port)
2140 #if IS_ENABLED(CONFIG_IPV6)
2142 if (!timer_pending(&br->ip6_other_query.timer) ||
2143 rcu_dereference(br->ip6_querier.port) == port)
2156 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);