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->flags & MDB_PG_FLAGS_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, 0);
708 rcu_assign_pointer(*pp, p);
709 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
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 == MDB_RTR_TYPE_DISABLED ||
764 port->multicast_router == MDB_RTR_TYPE_PERM ||
765 timer_pending(&port->multicast_router_timer) ||
766 hlist_unhashed(&port->rlist))
769 hlist_del_init_rcu(&port->rlist);
770 br_rtr_notify(br->dev, port, RTM_DELMDB);
771 /* Don't allow timer refresh if the router expired */
772 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
773 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
776 spin_unlock(&br->multicast_lock);
779 static void br_multicast_local_router_expired(unsigned long data)
783 static void br_multicast_querier_expired(struct net_bridge *br,
784 struct bridge_mcast_own_query *query)
786 spin_lock(&br->multicast_lock);
787 if (!netif_running(br->dev) || br->multicast_disabled)
790 br_multicast_start_querier(br, query);
793 spin_unlock(&br->multicast_lock);
796 static void br_ip4_multicast_querier_expired(unsigned long data)
798 struct net_bridge *br = (void *)data;
800 br_multicast_querier_expired(br, &br->ip4_own_query);
803 #if IS_ENABLED(CONFIG_IPV6)
804 static void br_ip6_multicast_querier_expired(unsigned long data)
806 struct net_bridge *br = (void *)data;
808 br_multicast_querier_expired(br, &br->ip6_own_query);
812 static void br_multicast_select_own_querier(struct net_bridge *br,
816 if (ip->proto == htons(ETH_P_IP))
817 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
818 #if IS_ENABLED(CONFIG_IPV6)
820 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
824 static void __br_multicast_send_query(struct net_bridge *br,
825 struct net_bridge_port *port,
830 skb = br_multicast_alloc_query(br, ip);
835 skb->dev = port->dev;
836 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
837 dev_net(port->dev), NULL, skb, NULL, skb->dev,
838 br_dev_queue_push_xmit);
840 br_multicast_select_own_querier(br, ip, skb);
845 static void br_multicast_send_query(struct net_bridge *br,
846 struct net_bridge_port *port,
847 struct bridge_mcast_own_query *own_query)
850 struct br_ip br_group;
851 struct bridge_mcast_other_query *other_query = NULL;
853 if (!netif_running(br->dev) || br->multicast_disabled ||
854 !br->multicast_querier)
857 memset(&br_group.u, 0, sizeof(br_group.u));
859 if (port ? (own_query == &port->ip4_own_query) :
860 (own_query == &br->ip4_own_query)) {
861 other_query = &br->ip4_other_query;
862 br_group.proto = htons(ETH_P_IP);
863 #if IS_ENABLED(CONFIG_IPV6)
865 other_query = &br->ip6_other_query;
866 br_group.proto = htons(ETH_P_IPV6);
870 if (!other_query || timer_pending(&other_query->timer))
873 __br_multicast_send_query(br, port, &br_group);
876 time += own_query->startup_sent < br->multicast_startup_query_count ?
877 br->multicast_startup_query_interval :
878 br->multicast_query_interval;
879 mod_timer(&own_query->timer, time);
883 br_multicast_port_query_expired(struct net_bridge_port *port,
884 struct bridge_mcast_own_query *query)
886 struct net_bridge *br = port->br;
888 spin_lock(&br->multicast_lock);
889 if (port->state == BR_STATE_DISABLED ||
890 port->state == BR_STATE_BLOCKING)
893 if (query->startup_sent < br->multicast_startup_query_count)
894 query->startup_sent++;
896 br_multicast_send_query(port->br, port, query);
899 spin_unlock(&br->multicast_lock);
902 static void br_ip4_multicast_port_query_expired(unsigned long data)
904 struct net_bridge_port *port = (void *)data;
906 br_multicast_port_query_expired(port, &port->ip4_own_query);
909 #if IS_ENABLED(CONFIG_IPV6)
910 static void br_ip6_multicast_port_query_expired(unsigned long data)
912 struct net_bridge_port *port = (void *)data;
914 br_multicast_port_query_expired(port, &port->ip6_own_query);
918 void br_multicast_add_port(struct net_bridge_port *port)
920 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
922 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
923 (unsigned long)port);
924 setup_timer(&port->ip4_own_query.timer,
925 br_ip4_multicast_port_query_expired, (unsigned long)port);
926 #if IS_ENABLED(CONFIG_IPV6)
927 setup_timer(&port->ip6_own_query.timer,
928 br_ip6_multicast_port_query_expired, (unsigned long)port);
932 void br_multicast_del_port(struct net_bridge_port *port)
934 struct net_bridge *br = port->br;
935 struct net_bridge_port_group *pg;
936 struct hlist_node *n;
938 /* Take care of the remaining groups, only perm ones should be left */
939 spin_lock_bh(&br->multicast_lock);
940 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
941 br_multicast_del_pg(br, pg);
942 spin_unlock_bh(&br->multicast_lock);
943 del_timer_sync(&port->multicast_router_timer);
946 static void br_multicast_enable(struct bridge_mcast_own_query *query)
948 query->startup_sent = 0;
950 if (try_to_del_timer_sync(&query->timer) >= 0 ||
951 del_timer(&query->timer))
952 mod_timer(&query->timer, jiffies);
955 void br_multicast_enable_port(struct net_bridge_port *port)
957 struct net_bridge *br = port->br;
959 spin_lock(&br->multicast_lock);
960 if (br->multicast_disabled || !netif_running(br->dev))
963 br_multicast_enable(&port->ip4_own_query);
964 #if IS_ENABLED(CONFIG_IPV6)
965 br_multicast_enable(&port->ip6_own_query);
967 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
968 hlist_unhashed(&port->rlist))
969 br_multicast_add_router(br, port);
972 spin_unlock(&br->multicast_lock);
975 void br_multicast_disable_port(struct net_bridge_port *port)
977 struct net_bridge *br = port->br;
978 struct net_bridge_port_group *pg;
979 struct hlist_node *n;
981 spin_lock(&br->multicast_lock);
982 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
983 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
984 br_multicast_del_pg(br, pg);
986 if (!hlist_unhashed(&port->rlist)) {
987 hlist_del_init_rcu(&port->rlist);
988 br_rtr_notify(br->dev, port, RTM_DELMDB);
989 /* Don't allow timer refresh if disabling */
990 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
991 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
993 del_timer(&port->multicast_router_timer);
994 del_timer(&port->ip4_own_query.timer);
995 #if IS_ENABLED(CONFIG_IPV6)
996 del_timer(&port->ip6_own_query.timer);
998 spin_unlock(&br->multicast_lock);
1001 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1002 struct net_bridge_port *port,
1003 struct sk_buff *skb,
1006 struct igmpv3_report *ih;
1007 struct igmpv3_grec *grec;
1015 ih = igmpv3_report_hdr(skb);
1016 num = ntohs(ih->ngrec);
1017 len = skb_transport_offset(skb) + sizeof(*ih);
1019 for (i = 0; i < num; i++) {
1020 len += sizeof(*grec);
1021 if (!pskb_may_pull(skb, len))
1024 grec = (void *)(skb->data + len - sizeof(*grec));
1025 group = grec->grec_mca;
1026 type = grec->grec_type;
1028 len += ntohs(grec->grec_nsrcs) * 4;
1029 if (!pskb_may_pull(skb, len))
1032 /* We treat this as an IGMPv2 report for now. */
1034 case IGMPV3_MODE_IS_INCLUDE:
1035 case IGMPV3_MODE_IS_EXCLUDE:
1036 case IGMPV3_CHANGE_TO_INCLUDE:
1037 case IGMPV3_CHANGE_TO_EXCLUDE:
1038 case IGMPV3_ALLOW_NEW_SOURCES:
1039 case IGMPV3_BLOCK_OLD_SOURCES:
1046 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1047 type == IGMPV3_MODE_IS_INCLUDE) &&
1048 ntohs(grec->grec_nsrcs) == 0) {
1049 br_ip4_multicast_leave_group(br, port, group, vid);
1051 err = br_ip4_multicast_add_group(br, port, group, vid);
1060 #if IS_ENABLED(CONFIG_IPV6)
1061 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1062 struct net_bridge_port *port,
1063 struct sk_buff *skb,
1066 struct icmp6hdr *icmp6h;
1067 struct mld2_grec *grec;
1073 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1076 icmp6h = icmp6_hdr(skb);
1077 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1078 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1080 for (i = 0; i < num; i++) {
1081 __be16 *nsrcs, _nsrcs;
1083 nsrcs = skb_header_pointer(skb,
1084 len + offsetof(struct mld2_grec,
1086 sizeof(_nsrcs), &_nsrcs);
1090 if (!pskb_may_pull(skb,
1091 len + sizeof(*grec) +
1092 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1095 grec = (struct mld2_grec *)(skb->data + len);
1096 len += sizeof(*grec) +
1097 sizeof(struct in6_addr) * ntohs(*nsrcs);
1099 /* We treat these as MLDv1 reports for now. */
1100 switch (grec->grec_type) {
1101 case MLD2_MODE_IS_INCLUDE:
1102 case MLD2_MODE_IS_EXCLUDE:
1103 case MLD2_CHANGE_TO_INCLUDE:
1104 case MLD2_CHANGE_TO_EXCLUDE:
1105 case MLD2_ALLOW_NEW_SOURCES:
1106 case MLD2_BLOCK_OLD_SOURCES:
1113 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1114 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1115 ntohs(*nsrcs) == 0) {
1116 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1119 err = br_ip6_multicast_add_group(br, port,
1120 &grec->grec_mca, vid);
1130 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1131 struct net_bridge_port *port,
1134 if (!timer_pending(&br->ip4_own_query.timer) &&
1135 !timer_pending(&br->ip4_other_query.timer))
1138 if (!br->ip4_querier.addr.u.ip4)
1141 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1147 br->ip4_querier.addr.u.ip4 = saddr;
1149 /* update protected by general multicast_lock by caller */
1150 rcu_assign_pointer(br->ip4_querier.port, port);
1155 #if IS_ENABLED(CONFIG_IPV6)
1156 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1157 struct net_bridge_port *port,
1158 struct in6_addr *saddr)
1160 if (!timer_pending(&br->ip6_own_query.timer) &&
1161 !timer_pending(&br->ip6_other_query.timer))
1164 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1170 br->ip6_querier.addr.u.ip6 = *saddr;
1172 /* update protected by general multicast_lock by caller */
1173 rcu_assign_pointer(br->ip6_querier.port, port);
1179 static bool br_multicast_select_querier(struct net_bridge *br,
1180 struct net_bridge_port *port,
1181 struct br_ip *saddr)
1183 switch (saddr->proto) {
1184 case htons(ETH_P_IP):
1185 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1186 #if IS_ENABLED(CONFIG_IPV6)
1187 case htons(ETH_P_IPV6):
1188 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1196 br_multicast_update_query_timer(struct net_bridge *br,
1197 struct bridge_mcast_other_query *query,
1198 unsigned long max_delay)
1200 if (!timer_pending(&query->timer))
1201 query->delay_time = jiffies + max_delay;
1203 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1207 * Add port to router_list
1208 * list is maintained ordered by pointer value
1209 * and locked by br->multicast_lock and RCU
1211 static void br_multicast_add_router(struct net_bridge *br,
1212 struct net_bridge_port *port)
1214 struct net_bridge_port *p;
1215 struct hlist_node *slot = NULL;
1217 if (!hlist_unhashed(&port->rlist))
1220 hlist_for_each_entry(p, &br->router_list, rlist) {
1221 if ((unsigned long) port >= (unsigned long) p)
1227 hlist_add_behind_rcu(&port->rlist, slot);
1229 hlist_add_head_rcu(&port->rlist, &br->router_list);
1230 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1233 static void br_multicast_mark_router(struct net_bridge *br,
1234 struct net_bridge_port *port)
1236 unsigned long now = jiffies;
1239 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1240 mod_timer(&br->multicast_router_timer,
1241 now + br->multicast_querier_interval);
1245 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1246 port->multicast_router == MDB_RTR_TYPE_PERM)
1249 br_multicast_add_router(br, port);
1251 mod_timer(&port->multicast_router_timer,
1252 now + br->multicast_querier_interval);
1255 static void br_multicast_query_received(struct net_bridge *br,
1256 struct net_bridge_port *port,
1257 struct bridge_mcast_other_query *query,
1258 struct br_ip *saddr,
1259 unsigned long max_delay)
1261 if (!br_multicast_select_querier(br, port, saddr))
1264 br_multicast_update_query_timer(br, query, max_delay);
1265 br_multicast_mark_router(br, port);
1268 static int br_ip4_multicast_query(struct net_bridge *br,
1269 struct net_bridge_port *port,
1270 struct sk_buff *skb,
1273 const struct iphdr *iph = ip_hdr(skb);
1274 struct igmphdr *ih = igmp_hdr(skb);
1275 struct net_bridge_mdb_entry *mp;
1276 struct igmpv3_query *ih3;
1277 struct net_bridge_port_group *p;
1278 struct net_bridge_port_group __rcu **pp;
1280 unsigned long max_delay;
1281 unsigned long now = jiffies;
1282 unsigned int offset = skb_transport_offset(skb);
1286 spin_lock(&br->multicast_lock);
1287 if (!netif_running(br->dev) ||
1288 (port && port->state == BR_STATE_DISABLED))
1293 if (skb->len == offset + sizeof(*ih)) {
1294 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1297 max_delay = 10 * HZ;
1300 } else if (skb->len >= offset + sizeof(*ih3)) {
1301 ih3 = igmpv3_query_hdr(skb);
1305 max_delay = ih3->code ?
1306 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1312 saddr.proto = htons(ETH_P_IP);
1313 saddr.u.ip4 = iph->saddr;
1315 br_multicast_query_received(br, port, &br->ip4_other_query,
1320 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1324 max_delay *= br->multicast_last_member_count;
1327 (timer_pending(&mp->timer) ?
1328 time_after(mp->timer.expires, now + max_delay) :
1329 try_to_del_timer_sync(&mp->timer) >= 0))
1330 mod_timer(&mp->timer, now + max_delay);
1332 for (pp = &mp->ports;
1333 (p = mlock_dereference(*pp, br)) != NULL;
1335 if (timer_pending(&p->timer) ?
1336 time_after(p->timer.expires, now + max_delay) :
1337 try_to_del_timer_sync(&p->timer) >= 0)
1338 mod_timer(&p->timer, now + max_delay);
1342 spin_unlock(&br->multicast_lock);
1346 #if IS_ENABLED(CONFIG_IPV6)
1347 static int br_ip6_multicast_query(struct net_bridge *br,
1348 struct net_bridge_port *port,
1349 struct sk_buff *skb,
1352 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1353 struct mld_msg *mld;
1354 struct net_bridge_mdb_entry *mp;
1355 struct mld2_query *mld2q;
1356 struct net_bridge_port_group *p;
1357 struct net_bridge_port_group __rcu **pp;
1359 unsigned long max_delay;
1360 unsigned long now = jiffies;
1361 unsigned int offset = skb_transport_offset(skb);
1362 const struct in6_addr *group = NULL;
1363 bool is_general_query;
1366 spin_lock(&br->multicast_lock);
1367 if (!netif_running(br->dev) ||
1368 (port && port->state == BR_STATE_DISABLED))
1371 if (skb->len == offset + sizeof(*mld)) {
1372 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1376 mld = (struct mld_msg *) icmp6_hdr(skb);
1377 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1379 group = &mld->mld_mca;
1381 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1385 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1386 if (!mld2q->mld2q_nsrcs)
1387 group = &mld2q->mld2q_mca;
1389 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1392 is_general_query = group && ipv6_addr_any(group);
1394 if (is_general_query) {
1395 saddr.proto = htons(ETH_P_IPV6);
1396 saddr.u.ip6 = ip6h->saddr;
1398 br_multicast_query_received(br, port, &br->ip6_other_query,
1401 } else if (!group) {
1405 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1409 max_delay *= br->multicast_last_member_count;
1411 (timer_pending(&mp->timer) ?
1412 time_after(mp->timer.expires, now + max_delay) :
1413 try_to_del_timer_sync(&mp->timer) >= 0))
1414 mod_timer(&mp->timer, now + max_delay);
1416 for (pp = &mp->ports;
1417 (p = mlock_dereference(*pp, br)) != NULL;
1419 if (timer_pending(&p->timer) ?
1420 time_after(p->timer.expires, now + max_delay) :
1421 try_to_del_timer_sync(&p->timer) >= 0)
1422 mod_timer(&p->timer, now + max_delay);
1426 spin_unlock(&br->multicast_lock);
1432 br_multicast_leave_group(struct net_bridge *br,
1433 struct net_bridge_port *port,
1434 struct br_ip *group,
1435 struct bridge_mcast_other_query *other_query,
1436 struct bridge_mcast_own_query *own_query)
1438 struct net_bridge_mdb_htable *mdb;
1439 struct net_bridge_mdb_entry *mp;
1440 struct net_bridge_port_group *p;
1444 spin_lock(&br->multicast_lock);
1445 if (!netif_running(br->dev) ||
1446 (port && port->state == BR_STATE_DISABLED))
1449 mdb = mlock_dereference(br->mdb, br);
1450 mp = br_mdb_ip_get(mdb, group);
1454 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1455 struct net_bridge_port_group __rcu **pp;
1457 for (pp = &mp->ports;
1458 (p = mlock_dereference(*pp, br)) != NULL;
1460 if (p->port != port)
1463 rcu_assign_pointer(*pp, p->next);
1464 hlist_del_init(&p->mglist);
1465 del_timer(&p->timer);
1466 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1467 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1470 if (!mp->ports && !mp->mglist &&
1471 netif_running(br->dev))
1472 mod_timer(&mp->timer, jiffies);
1477 if (timer_pending(&other_query->timer))
1480 if (br->multicast_querier) {
1481 __br_multicast_send_query(br, port, &mp->addr);
1483 time = jiffies + br->multicast_last_member_count *
1484 br->multicast_last_member_interval;
1486 mod_timer(&own_query->timer, time);
1488 for (p = mlock_dereference(mp->ports, br);
1490 p = mlock_dereference(p->next, br)) {
1491 if (p->port != port)
1494 if (!hlist_unhashed(&p->mglist) &&
1495 (timer_pending(&p->timer) ?
1496 time_after(p->timer.expires, time) :
1497 try_to_del_timer_sync(&p->timer) >= 0)) {
1498 mod_timer(&p->timer, time);
1506 time = now + br->multicast_last_member_count *
1507 br->multicast_last_member_interval;
1511 (timer_pending(&mp->timer) ?
1512 time_after(mp->timer.expires, time) :
1513 try_to_del_timer_sync(&mp->timer) >= 0)) {
1514 mod_timer(&mp->timer, time);
1520 for (p = mlock_dereference(mp->ports, br);
1522 p = mlock_dereference(p->next, br)) {
1523 if (p->port != port)
1526 if (!hlist_unhashed(&p->mglist) &&
1527 (timer_pending(&p->timer) ?
1528 time_after(p->timer.expires, time) :
1529 try_to_del_timer_sync(&p->timer) >= 0)) {
1530 mod_timer(&p->timer, time);
1536 spin_unlock(&br->multicast_lock);
1539 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1540 struct net_bridge_port *port,
1544 struct br_ip br_group;
1545 struct bridge_mcast_own_query *own_query;
1547 if (ipv4_is_local_multicast(group))
1550 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1552 br_group.u.ip4 = group;
1553 br_group.proto = htons(ETH_P_IP);
1556 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1560 #if IS_ENABLED(CONFIG_IPV6)
1561 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1562 struct net_bridge_port *port,
1563 const struct in6_addr *group,
1566 struct br_ip br_group;
1567 struct bridge_mcast_own_query *own_query;
1569 if (ipv6_addr_is_ll_all_nodes(group))
1572 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1574 br_group.u.ip6 = *group;
1575 br_group.proto = htons(ETH_P_IPV6);
1578 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1583 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1584 struct net_bridge_port *port,
1585 struct sk_buff *skb,
1588 struct sk_buff *skb_trimmed = NULL;
1592 err = ip_mc_check_igmp(skb, &skb_trimmed);
1594 if (err == -ENOMSG) {
1595 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1596 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1598 } else if (err < 0) {
1602 BR_INPUT_SKB_CB(skb)->igmp = 1;
1606 case IGMP_HOST_MEMBERSHIP_REPORT:
1607 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1608 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1609 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1611 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1612 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1614 case IGMP_HOST_MEMBERSHIP_QUERY:
1615 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1617 case IGMP_HOST_LEAVE_MESSAGE:
1618 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1622 if (skb_trimmed && skb_trimmed != skb)
1623 kfree_skb(skb_trimmed);
1628 #if IS_ENABLED(CONFIG_IPV6)
1629 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1630 struct net_bridge_port *port,
1631 struct sk_buff *skb,
1634 struct sk_buff *skb_trimmed = NULL;
1635 struct mld_msg *mld;
1638 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1640 if (err == -ENOMSG) {
1641 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1642 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1644 } else if (err < 0) {
1648 BR_INPUT_SKB_CB(skb)->igmp = 1;
1649 mld = (struct mld_msg *)skb_transport_header(skb);
1651 switch (mld->mld_type) {
1652 case ICMPV6_MGM_REPORT:
1653 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1654 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1656 case ICMPV6_MLD2_REPORT:
1657 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1659 case ICMPV6_MGM_QUERY:
1660 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1662 case ICMPV6_MGM_REDUCTION:
1663 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1667 if (skb_trimmed && skb_trimmed != skb)
1668 kfree_skb(skb_trimmed);
1674 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1675 struct sk_buff *skb, u16 vid)
1677 BR_INPUT_SKB_CB(skb)->igmp = 0;
1678 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1680 if (br->multicast_disabled)
1683 switch (skb->protocol) {
1684 case htons(ETH_P_IP):
1685 return br_multicast_ipv4_rcv(br, port, skb, vid);
1686 #if IS_ENABLED(CONFIG_IPV6)
1687 case htons(ETH_P_IPV6):
1688 return br_multicast_ipv6_rcv(br, port, skb, vid);
1695 static void br_multicast_query_expired(struct net_bridge *br,
1696 struct bridge_mcast_own_query *query,
1697 struct bridge_mcast_querier *querier)
1699 spin_lock(&br->multicast_lock);
1700 if (query->startup_sent < br->multicast_startup_query_count)
1701 query->startup_sent++;
1703 RCU_INIT_POINTER(querier->port, NULL);
1704 br_multicast_send_query(br, NULL, query);
1705 spin_unlock(&br->multicast_lock);
1708 static void br_ip4_multicast_query_expired(unsigned long data)
1710 struct net_bridge *br = (void *)data;
1712 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1715 #if IS_ENABLED(CONFIG_IPV6)
1716 static void br_ip6_multicast_query_expired(unsigned long data)
1718 struct net_bridge *br = (void *)data;
1720 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1724 void br_multicast_init(struct net_bridge *br)
1726 br->hash_elasticity = 4;
1729 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1730 br->multicast_querier = 0;
1731 br->multicast_query_use_ifaddr = 0;
1732 br->multicast_last_member_count = 2;
1733 br->multicast_startup_query_count = 2;
1735 br->multicast_last_member_interval = HZ;
1736 br->multicast_query_response_interval = 10 * HZ;
1737 br->multicast_startup_query_interval = 125 * HZ / 4;
1738 br->multicast_query_interval = 125 * HZ;
1739 br->multicast_querier_interval = 255 * HZ;
1740 br->multicast_membership_interval = 260 * HZ;
1742 br->ip4_other_query.delay_time = 0;
1743 br->ip4_querier.port = NULL;
1744 #if IS_ENABLED(CONFIG_IPV6)
1745 br->ip6_other_query.delay_time = 0;
1746 br->ip6_querier.port = NULL;
1749 spin_lock_init(&br->multicast_lock);
1750 setup_timer(&br->multicast_router_timer,
1751 br_multicast_local_router_expired, 0);
1752 setup_timer(&br->ip4_other_query.timer,
1753 br_ip4_multicast_querier_expired, (unsigned long)br);
1754 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1756 #if IS_ENABLED(CONFIG_IPV6)
1757 setup_timer(&br->ip6_other_query.timer,
1758 br_ip6_multicast_querier_expired, (unsigned long)br);
1759 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1764 static void __br_multicast_open(struct net_bridge *br,
1765 struct bridge_mcast_own_query *query)
1767 query->startup_sent = 0;
1769 if (br->multicast_disabled)
1772 mod_timer(&query->timer, jiffies);
1775 void br_multicast_open(struct net_bridge *br)
1777 __br_multicast_open(br, &br->ip4_own_query);
1778 #if IS_ENABLED(CONFIG_IPV6)
1779 __br_multicast_open(br, &br->ip6_own_query);
1783 void br_multicast_stop(struct net_bridge *br)
1785 del_timer_sync(&br->multicast_router_timer);
1786 del_timer_sync(&br->ip4_other_query.timer);
1787 del_timer_sync(&br->ip4_own_query.timer);
1788 #if IS_ENABLED(CONFIG_IPV6)
1789 del_timer_sync(&br->ip6_other_query.timer);
1790 del_timer_sync(&br->ip6_own_query.timer);
1794 void br_multicast_dev_del(struct net_bridge *br)
1796 struct net_bridge_mdb_htable *mdb;
1797 struct net_bridge_mdb_entry *mp;
1798 struct hlist_node *n;
1802 spin_lock_bh(&br->multicast_lock);
1803 mdb = mlock_dereference(br->mdb, br);
1810 for (i = 0; i < mdb->max; i++) {
1811 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1813 del_timer(&mp->timer);
1814 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1819 spin_unlock_bh(&br->multicast_lock);
1821 spin_lock_bh(&br->multicast_lock);
1826 call_rcu_bh(&mdb->rcu, br_mdb_free);
1829 spin_unlock_bh(&br->multicast_lock);
1832 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1836 spin_lock_bh(&br->multicast_lock);
1839 case MDB_RTR_TYPE_DISABLED:
1840 case MDB_RTR_TYPE_PERM:
1841 del_timer(&br->multicast_router_timer);
1843 case MDB_RTR_TYPE_TEMP_QUERY:
1844 br->multicast_router = val;
1849 spin_unlock_bh(&br->multicast_lock);
1854 static void __del_port_router(struct net_bridge_port *p)
1856 if (hlist_unhashed(&p->rlist))
1858 hlist_del_init_rcu(&p->rlist);
1859 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1862 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1864 struct net_bridge *br = p->br;
1865 unsigned long now = jiffies;
1868 spin_lock(&br->multicast_lock);
1869 if (p->multicast_router == val) {
1870 /* Refresh the temp router port timer */
1871 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1872 mod_timer(&p->multicast_router_timer,
1873 now + br->multicast_querier_interval);
1878 case MDB_RTR_TYPE_DISABLED:
1879 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1880 __del_port_router(p);
1881 del_timer(&p->multicast_router_timer);
1883 case MDB_RTR_TYPE_TEMP_QUERY:
1884 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1885 __del_port_router(p);
1887 case MDB_RTR_TYPE_PERM:
1888 p->multicast_router = MDB_RTR_TYPE_PERM;
1889 del_timer(&p->multicast_router_timer);
1890 br_multicast_add_router(br, p);
1892 case MDB_RTR_TYPE_TEMP:
1893 p->multicast_router = MDB_RTR_TYPE_TEMP;
1894 br_multicast_mark_router(br, p);
1901 spin_unlock(&br->multicast_lock);
1906 static void br_multicast_start_querier(struct net_bridge *br,
1907 struct bridge_mcast_own_query *query)
1909 struct net_bridge_port *port;
1911 __br_multicast_open(br, query);
1913 list_for_each_entry(port, &br->port_list, list) {
1914 if (port->state == BR_STATE_DISABLED ||
1915 port->state == BR_STATE_BLOCKING)
1918 if (query == &br->ip4_own_query)
1919 br_multicast_enable(&port->ip4_own_query);
1920 #if IS_ENABLED(CONFIG_IPV6)
1922 br_multicast_enable(&port->ip6_own_query);
1927 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1930 struct net_bridge_mdb_htable *mdb;
1932 spin_lock_bh(&br->multicast_lock);
1933 if (br->multicast_disabled == !val)
1936 br->multicast_disabled = !val;
1937 if (br->multicast_disabled)
1940 if (!netif_running(br->dev))
1943 mdb = mlock_dereference(br->mdb, br);
1948 br->multicast_disabled = !!val;
1952 err = br_mdb_rehash(&br->mdb, mdb->max,
1953 br->hash_elasticity);
1958 br_multicast_start_querier(br, &br->ip4_own_query);
1959 #if IS_ENABLED(CONFIG_IPV6)
1960 br_multicast_start_querier(br, &br->ip6_own_query);
1964 spin_unlock_bh(&br->multicast_lock);
1969 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1971 unsigned long max_delay;
1975 spin_lock_bh(&br->multicast_lock);
1976 if (br->multicast_querier == val)
1979 br->multicast_querier = val;
1983 max_delay = br->multicast_query_response_interval;
1985 if (!timer_pending(&br->ip4_other_query.timer))
1986 br->ip4_other_query.delay_time = jiffies + max_delay;
1988 br_multicast_start_querier(br, &br->ip4_own_query);
1990 #if IS_ENABLED(CONFIG_IPV6)
1991 if (!timer_pending(&br->ip6_other_query.timer))
1992 br->ip6_other_query.delay_time = jiffies + max_delay;
1994 br_multicast_start_querier(br, &br->ip6_own_query);
1998 spin_unlock_bh(&br->multicast_lock);
2003 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2007 struct net_bridge_mdb_htable *mdb;
2009 spin_lock_bh(&br->multicast_lock);
2010 if (!is_power_of_2(val))
2013 mdb = mlock_dereference(br->mdb, br);
2014 if (mdb && val < mdb->size)
2030 err = br_mdb_rehash(&br->mdb, br->hash_max,
2031 br->hash_elasticity);
2037 spin_unlock_bh(&br->multicast_lock);
2043 * br_multicast_list_adjacent - Returns snooped multicast addresses
2044 * @dev: The bridge port adjacent to which to retrieve addresses
2045 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2047 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2048 * snooping feature on all bridge ports of dev's bridge device, excluding
2049 * the addresses from dev itself.
2051 * Returns the number of items added to br_ip_list.
2054 * - br_ip_list needs to be initialized by caller
2055 * - br_ip_list might contain duplicates in the end
2056 * (needs to be taken care of by caller)
2057 * - br_ip_list needs to be freed by caller
2059 int br_multicast_list_adjacent(struct net_device *dev,
2060 struct list_head *br_ip_list)
2062 struct net_bridge *br;
2063 struct net_bridge_port *port;
2064 struct net_bridge_port_group *group;
2065 struct br_ip_list *entry;
2069 if (!br_ip_list || !br_port_exists(dev))
2072 port = br_port_get_rcu(dev);
2073 if (!port || !port->br)
2078 list_for_each_entry_rcu(port, &br->port_list, list) {
2079 if (!port->dev || port->dev == dev)
2082 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2083 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2087 entry->addr = group->addr;
2088 list_add(&entry->list, br_ip_list);
2097 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2100 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2101 * @dev: The bridge port providing the bridge on which to check for a querier
2102 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2104 * Checks whether the given interface has a bridge on top and if so returns
2105 * true if a valid querier exists anywhere on the bridged link layer.
2106 * Otherwise returns false.
2108 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2110 struct net_bridge *br;
2111 struct net_bridge_port *port;
2116 if (!br_port_exists(dev))
2119 port = br_port_get_rcu(dev);
2120 if (!port || !port->br)
2125 memset(ð, 0, sizeof(eth));
2126 eth.h_proto = htons(proto);
2128 ret = br_multicast_querier_exists(br, ð);
2134 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2137 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2138 * @dev: The bridge port adjacent to which to check for a querier
2139 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2141 * Checks whether the given interface has a bridge on top and if so returns
2142 * true if a selected querier is behind one of the other ports of this
2143 * bridge. Otherwise returns false.
2145 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2147 struct net_bridge *br;
2148 struct net_bridge_port *port;
2152 if (!br_port_exists(dev))
2155 port = br_port_get_rcu(dev);
2156 if (!port || !port->br)
2163 if (!timer_pending(&br->ip4_other_query.timer) ||
2164 rcu_dereference(br->ip4_querier.port) == port)
2167 #if IS_ENABLED(CONFIG_IPV6)
2169 if (!timer_pending(&br->ip6_other_query.timer) ||
2170 rcu_dereference(br->ip6_querier.port) == port)
2183 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);