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,
467 br->has_ipv6_addr = 0;
471 br->has_ipv6_addr = 1;
472 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
474 hopopt = (u8 *)(ip6h + 1);
475 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
476 hopopt[1] = 0; /* length of HbH */
477 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
478 hopopt[3] = 2; /* Length of RA Option */
479 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
481 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
482 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
484 skb_put(skb, sizeof(*ip6h) + 8);
487 skb_set_transport_header(skb, skb->len);
488 mldq = (struct mld_msg *) icmp6_hdr(skb);
490 interval = ipv6_addr_any(group) ?
491 br->multicast_query_response_interval :
492 br->multicast_last_member_interval;
494 mldq->mld_type = ICMPV6_MGM_QUERY;
497 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
498 mldq->mld_reserved = 0;
499 mldq->mld_mca = *group;
502 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
503 sizeof(*mldq), IPPROTO_ICMPV6,
506 skb_put(skb, sizeof(*mldq));
508 __skb_pull(skb, sizeof(*eth));
515 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
518 switch (addr->proto) {
519 case htons(ETH_P_IP):
520 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
521 #if IS_ENABLED(CONFIG_IPV6)
522 case htons(ETH_P_IPV6):
523 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
529 static struct net_bridge_mdb_entry *br_multicast_get_group(
530 struct net_bridge *br, struct net_bridge_port *port,
531 struct br_ip *group, int hash)
533 struct net_bridge_mdb_htable *mdb;
534 struct net_bridge_mdb_entry *mp;
535 unsigned int count = 0;
540 mdb = rcu_dereference_protected(br->mdb, 1);
541 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
543 if (unlikely(br_ip_equal(group, &mp->addr)))
550 if (unlikely(count > br->hash_elasticity && count)) {
552 br_info(br, "Multicast hash table "
553 "chain limit reached: %s\n",
554 port ? port->dev->name : br->dev->name);
556 elasticity = br->hash_elasticity;
559 if (mdb->size >= max) {
561 if (unlikely(max > br->hash_max)) {
562 br_warn(br, "Multicast hash table maximum of %d "
563 "reached, disabling snooping: %s\n",
565 port ? port->dev->name : br->dev->name);
568 br->multicast_disabled = 1;
573 if (max > mdb->max || elasticity) {
576 br_info(br, "Multicast hash table "
578 port ? port->dev->name : br->dev->name);
583 err = br_mdb_rehash(&br->mdb, max, elasticity);
585 br_warn(br, "Cannot rehash multicast "
586 "hash table, disabling snooping: %s, %d, %d\n",
587 port ? port->dev->name : br->dev->name,
603 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
604 struct net_bridge_port *port, struct br_ip *group)
606 struct net_bridge_mdb_htable *mdb;
607 struct net_bridge_mdb_entry *mp;
611 mdb = rcu_dereference_protected(br->mdb, 1);
613 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
619 hash = br_ip_hash(mdb, group);
620 mp = br_multicast_get_group(br, port, group, hash);
621 switch (PTR_ERR(mp)) {
627 mdb = rcu_dereference_protected(br->mdb, 1);
628 hash = br_ip_hash(mdb, group);
635 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
637 return ERR_PTR(-ENOMEM);
641 setup_timer(&mp->timer, br_multicast_group_expired,
644 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
651 struct net_bridge_port_group *br_multicast_new_port_group(
652 struct net_bridge_port *port,
654 struct net_bridge_port_group __rcu *next,
657 struct net_bridge_port_group *p;
659 p = kzalloc(sizeof(*p), GFP_ATOMIC);
666 rcu_assign_pointer(p->next, next);
667 hlist_add_head(&p->mglist, &port->mglist);
668 setup_timer(&p->timer, br_multicast_port_group_expired,
673 static int br_multicast_add_group(struct net_bridge *br,
674 struct net_bridge_port *port,
677 struct net_bridge_mdb_entry *mp;
678 struct net_bridge_port_group *p;
679 struct net_bridge_port_group __rcu **pp;
680 unsigned long now = jiffies;
683 spin_lock(&br->multicast_lock);
684 if (!netif_running(br->dev) ||
685 (port && port->state == BR_STATE_DISABLED))
688 mp = br_multicast_new_group(br, port, group);
695 mod_timer(&mp->timer, now + br->multicast_membership_interval);
699 for (pp = &mp->ports;
700 (p = mlock_dereference(*pp, br)) != NULL;
704 if ((unsigned long)p->port < (unsigned long)port)
708 p = br_multicast_new_port_group(port, group, *pp, 0);
711 rcu_assign_pointer(*pp, p);
712 br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
715 mod_timer(&p->timer, now + br->multicast_membership_interval);
720 spin_unlock(&br->multicast_lock);
724 static int br_ip4_multicast_add_group(struct net_bridge *br,
725 struct net_bridge_port *port,
729 struct br_ip br_group;
731 if (ipv4_is_local_multicast(group))
734 br_group.u.ip4 = group;
735 br_group.proto = htons(ETH_P_IP);
738 return br_multicast_add_group(br, port, &br_group);
741 #if IS_ENABLED(CONFIG_IPV6)
742 static int br_ip6_multicast_add_group(struct net_bridge *br,
743 struct net_bridge_port *port,
744 const struct in6_addr *group,
747 struct br_ip br_group;
749 if (ipv6_addr_is_ll_all_nodes(group))
752 br_group.u.ip6 = *group;
753 br_group.proto = htons(ETH_P_IPV6);
756 return br_multicast_add_group(br, port, &br_group);
760 static void br_multicast_router_expired(unsigned long data)
762 struct net_bridge_port *port = (void *)data;
763 struct net_bridge *br = port->br;
765 spin_lock(&br->multicast_lock);
766 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
767 port->multicast_router == MDB_RTR_TYPE_PERM ||
768 timer_pending(&port->multicast_router_timer) ||
769 hlist_unhashed(&port->rlist))
772 hlist_del_init_rcu(&port->rlist);
773 br_rtr_notify(br->dev, port, RTM_DELMDB);
774 /* Don't allow timer refresh if the router expired */
775 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
776 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
779 spin_unlock(&br->multicast_lock);
782 static void br_multicast_local_router_expired(unsigned long data)
786 static void br_multicast_querier_expired(struct net_bridge *br,
787 struct bridge_mcast_own_query *query)
789 spin_lock(&br->multicast_lock);
790 if (!netif_running(br->dev) || br->multicast_disabled)
793 br_multicast_start_querier(br, query);
796 spin_unlock(&br->multicast_lock);
799 static void br_ip4_multicast_querier_expired(unsigned long data)
801 struct net_bridge *br = (void *)data;
803 br_multicast_querier_expired(br, &br->ip4_own_query);
806 #if IS_ENABLED(CONFIG_IPV6)
807 static void br_ip6_multicast_querier_expired(unsigned long data)
809 struct net_bridge *br = (void *)data;
811 br_multicast_querier_expired(br, &br->ip6_own_query);
815 static void br_multicast_select_own_querier(struct net_bridge *br,
819 if (ip->proto == htons(ETH_P_IP))
820 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
821 #if IS_ENABLED(CONFIG_IPV6)
823 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
827 static void __br_multicast_send_query(struct net_bridge *br,
828 struct net_bridge_port *port,
833 skb = br_multicast_alloc_query(br, ip);
838 skb->dev = port->dev;
839 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
840 dev_net(port->dev), NULL, skb, NULL, skb->dev,
841 br_dev_queue_push_xmit);
843 br_multicast_select_own_querier(br, ip, skb);
848 static void br_multicast_send_query(struct net_bridge *br,
849 struct net_bridge_port *port,
850 struct bridge_mcast_own_query *own_query)
853 struct br_ip br_group;
854 struct bridge_mcast_other_query *other_query = NULL;
856 if (!netif_running(br->dev) || br->multicast_disabled ||
857 !br->multicast_querier)
860 memset(&br_group.u, 0, sizeof(br_group.u));
862 if (port ? (own_query == &port->ip4_own_query) :
863 (own_query == &br->ip4_own_query)) {
864 other_query = &br->ip4_other_query;
865 br_group.proto = htons(ETH_P_IP);
866 #if IS_ENABLED(CONFIG_IPV6)
868 other_query = &br->ip6_other_query;
869 br_group.proto = htons(ETH_P_IPV6);
873 if (!other_query || timer_pending(&other_query->timer))
876 __br_multicast_send_query(br, port, &br_group);
879 time += own_query->startup_sent < br->multicast_startup_query_count ?
880 br->multicast_startup_query_interval :
881 br->multicast_query_interval;
882 mod_timer(&own_query->timer, time);
886 br_multicast_port_query_expired(struct net_bridge_port *port,
887 struct bridge_mcast_own_query *query)
889 struct net_bridge *br = port->br;
891 spin_lock(&br->multicast_lock);
892 if (port->state == BR_STATE_DISABLED ||
893 port->state == BR_STATE_BLOCKING)
896 if (query->startup_sent < br->multicast_startup_query_count)
897 query->startup_sent++;
899 br_multicast_send_query(port->br, port, query);
902 spin_unlock(&br->multicast_lock);
905 static void br_ip4_multicast_port_query_expired(unsigned long data)
907 struct net_bridge_port *port = (void *)data;
909 br_multicast_port_query_expired(port, &port->ip4_own_query);
912 #if IS_ENABLED(CONFIG_IPV6)
913 static void br_ip6_multicast_port_query_expired(unsigned long data)
915 struct net_bridge_port *port = (void *)data;
917 br_multicast_port_query_expired(port, &port->ip6_own_query);
921 void br_multicast_add_port(struct net_bridge_port *port)
923 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
925 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
926 (unsigned long)port);
927 setup_timer(&port->ip4_own_query.timer,
928 br_ip4_multicast_port_query_expired, (unsigned long)port);
929 #if IS_ENABLED(CONFIG_IPV6)
930 setup_timer(&port->ip6_own_query.timer,
931 br_ip6_multicast_port_query_expired, (unsigned long)port);
935 void br_multicast_del_port(struct net_bridge_port *port)
937 struct net_bridge *br = port->br;
938 struct net_bridge_port_group *pg;
939 struct hlist_node *n;
941 /* Take care of the remaining groups, only perm ones should be left */
942 spin_lock_bh(&br->multicast_lock);
943 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
944 br_multicast_del_pg(br, pg);
945 spin_unlock_bh(&br->multicast_lock);
946 del_timer_sync(&port->multicast_router_timer);
949 static void br_multicast_enable(struct bridge_mcast_own_query *query)
951 query->startup_sent = 0;
953 if (try_to_del_timer_sync(&query->timer) >= 0 ||
954 del_timer(&query->timer))
955 mod_timer(&query->timer, jiffies);
958 void br_multicast_enable_port(struct net_bridge_port *port)
960 struct net_bridge *br = port->br;
962 spin_lock(&br->multicast_lock);
963 if (br->multicast_disabled || !netif_running(br->dev))
966 br_multicast_enable(&port->ip4_own_query);
967 #if IS_ENABLED(CONFIG_IPV6)
968 br_multicast_enable(&port->ip6_own_query);
970 if (port->multicast_router == MDB_RTR_TYPE_PERM &&
971 hlist_unhashed(&port->rlist))
972 br_multicast_add_router(br, port);
975 spin_unlock(&br->multicast_lock);
978 void br_multicast_disable_port(struct net_bridge_port *port)
980 struct net_bridge *br = port->br;
981 struct net_bridge_port_group *pg;
982 struct hlist_node *n;
984 spin_lock(&br->multicast_lock);
985 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
986 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
987 br_multicast_del_pg(br, pg);
989 if (!hlist_unhashed(&port->rlist)) {
990 hlist_del_init_rcu(&port->rlist);
991 br_rtr_notify(br->dev, port, RTM_DELMDB);
992 /* Don't allow timer refresh if disabling */
993 if (port->multicast_router == MDB_RTR_TYPE_TEMP)
994 port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
996 del_timer(&port->multicast_router_timer);
997 del_timer(&port->ip4_own_query.timer);
998 #if IS_ENABLED(CONFIG_IPV6)
999 del_timer(&port->ip6_own_query.timer);
1001 spin_unlock(&br->multicast_lock);
1004 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1005 struct net_bridge_port *port,
1006 struct sk_buff *skb,
1009 struct igmpv3_report *ih;
1010 struct igmpv3_grec *grec;
1018 ih = igmpv3_report_hdr(skb);
1019 num = ntohs(ih->ngrec);
1020 len = skb_transport_offset(skb) + sizeof(*ih);
1022 for (i = 0; i < num; i++) {
1023 len += sizeof(*grec);
1024 if (!pskb_may_pull(skb, len))
1027 grec = (void *)(skb->data + len - sizeof(*grec));
1028 group = grec->grec_mca;
1029 type = grec->grec_type;
1031 len += ntohs(grec->grec_nsrcs) * 4;
1032 if (!pskb_may_pull(skb, len))
1035 /* We treat this as an IGMPv2 report for now. */
1037 case IGMPV3_MODE_IS_INCLUDE:
1038 case IGMPV3_MODE_IS_EXCLUDE:
1039 case IGMPV3_CHANGE_TO_INCLUDE:
1040 case IGMPV3_CHANGE_TO_EXCLUDE:
1041 case IGMPV3_ALLOW_NEW_SOURCES:
1042 case IGMPV3_BLOCK_OLD_SOURCES:
1049 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1050 type == IGMPV3_MODE_IS_INCLUDE) &&
1051 ntohs(grec->grec_nsrcs) == 0) {
1052 br_ip4_multicast_leave_group(br, port, group, vid);
1054 err = br_ip4_multicast_add_group(br, port, group, vid);
1063 #if IS_ENABLED(CONFIG_IPV6)
1064 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1065 struct net_bridge_port *port,
1066 struct sk_buff *skb,
1069 struct icmp6hdr *icmp6h;
1070 struct mld2_grec *grec;
1076 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1079 icmp6h = icmp6_hdr(skb);
1080 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1081 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1083 for (i = 0; i < num; i++) {
1084 __be16 *nsrcs, _nsrcs;
1086 nsrcs = skb_header_pointer(skb,
1087 len + offsetof(struct mld2_grec,
1089 sizeof(_nsrcs), &_nsrcs);
1093 if (!pskb_may_pull(skb,
1094 len + sizeof(*grec) +
1095 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1098 grec = (struct mld2_grec *)(skb->data + len);
1099 len += sizeof(*grec) +
1100 sizeof(struct in6_addr) * ntohs(*nsrcs);
1102 /* We treat these as MLDv1 reports for now. */
1103 switch (grec->grec_type) {
1104 case MLD2_MODE_IS_INCLUDE:
1105 case MLD2_MODE_IS_EXCLUDE:
1106 case MLD2_CHANGE_TO_INCLUDE:
1107 case MLD2_CHANGE_TO_EXCLUDE:
1108 case MLD2_ALLOW_NEW_SOURCES:
1109 case MLD2_BLOCK_OLD_SOURCES:
1116 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1117 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1118 ntohs(*nsrcs) == 0) {
1119 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1122 err = br_ip6_multicast_add_group(br, port,
1123 &grec->grec_mca, vid);
1133 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1134 struct net_bridge_port *port,
1137 if (!timer_pending(&br->ip4_own_query.timer) &&
1138 !timer_pending(&br->ip4_other_query.timer))
1141 if (!br->ip4_querier.addr.u.ip4)
1144 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1150 br->ip4_querier.addr.u.ip4 = saddr;
1152 /* update protected by general multicast_lock by caller */
1153 rcu_assign_pointer(br->ip4_querier.port, port);
1158 #if IS_ENABLED(CONFIG_IPV6)
1159 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1160 struct net_bridge_port *port,
1161 struct in6_addr *saddr)
1163 if (!timer_pending(&br->ip6_own_query.timer) &&
1164 !timer_pending(&br->ip6_other_query.timer))
1167 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1173 br->ip6_querier.addr.u.ip6 = *saddr;
1175 /* update protected by general multicast_lock by caller */
1176 rcu_assign_pointer(br->ip6_querier.port, port);
1182 static bool br_multicast_select_querier(struct net_bridge *br,
1183 struct net_bridge_port *port,
1184 struct br_ip *saddr)
1186 switch (saddr->proto) {
1187 case htons(ETH_P_IP):
1188 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1189 #if IS_ENABLED(CONFIG_IPV6)
1190 case htons(ETH_P_IPV6):
1191 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1199 br_multicast_update_query_timer(struct net_bridge *br,
1200 struct bridge_mcast_other_query *query,
1201 unsigned long max_delay)
1203 if (!timer_pending(&query->timer))
1204 query->delay_time = jiffies + max_delay;
1206 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1210 * Add port to router_list
1211 * list is maintained ordered by pointer value
1212 * and locked by br->multicast_lock and RCU
1214 static void br_multicast_add_router(struct net_bridge *br,
1215 struct net_bridge_port *port)
1217 struct net_bridge_port *p;
1218 struct hlist_node *slot = NULL;
1220 if (!hlist_unhashed(&port->rlist))
1223 hlist_for_each_entry(p, &br->router_list, rlist) {
1224 if ((unsigned long) port >= (unsigned long) p)
1230 hlist_add_behind_rcu(&port->rlist, slot);
1232 hlist_add_head_rcu(&port->rlist, &br->router_list);
1233 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1236 static void br_multicast_mark_router(struct net_bridge *br,
1237 struct net_bridge_port *port)
1239 unsigned long now = jiffies;
1242 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY)
1243 mod_timer(&br->multicast_router_timer,
1244 now + br->multicast_querier_interval);
1248 if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1249 port->multicast_router == MDB_RTR_TYPE_PERM)
1252 br_multicast_add_router(br, port);
1254 mod_timer(&port->multicast_router_timer,
1255 now + br->multicast_querier_interval);
1258 static void br_multicast_query_received(struct net_bridge *br,
1259 struct net_bridge_port *port,
1260 struct bridge_mcast_other_query *query,
1261 struct br_ip *saddr,
1262 unsigned long max_delay)
1264 if (!br_multicast_select_querier(br, port, saddr))
1267 br_multicast_update_query_timer(br, query, max_delay);
1268 br_multicast_mark_router(br, port);
1271 static int br_ip4_multicast_query(struct net_bridge *br,
1272 struct net_bridge_port *port,
1273 struct sk_buff *skb,
1276 const struct iphdr *iph = ip_hdr(skb);
1277 struct igmphdr *ih = igmp_hdr(skb);
1278 struct net_bridge_mdb_entry *mp;
1279 struct igmpv3_query *ih3;
1280 struct net_bridge_port_group *p;
1281 struct net_bridge_port_group __rcu **pp;
1283 unsigned long max_delay;
1284 unsigned long now = jiffies;
1285 unsigned int offset = skb_transport_offset(skb);
1289 spin_lock(&br->multicast_lock);
1290 if (!netif_running(br->dev) ||
1291 (port && port->state == BR_STATE_DISABLED))
1296 if (skb->len == offset + sizeof(*ih)) {
1297 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1300 max_delay = 10 * HZ;
1303 } else if (skb->len >= offset + sizeof(*ih3)) {
1304 ih3 = igmpv3_query_hdr(skb);
1308 max_delay = ih3->code ?
1309 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1315 saddr.proto = htons(ETH_P_IP);
1316 saddr.u.ip4 = iph->saddr;
1318 br_multicast_query_received(br, port, &br->ip4_other_query,
1323 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1327 max_delay *= br->multicast_last_member_count;
1330 (timer_pending(&mp->timer) ?
1331 time_after(mp->timer.expires, now + max_delay) :
1332 try_to_del_timer_sync(&mp->timer) >= 0))
1333 mod_timer(&mp->timer, now + max_delay);
1335 for (pp = &mp->ports;
1336 (p = mlock_dereference(*pp, br)) != NULL;
1338 if (timer_pending(&p->timer) ?
1339 time_after(p->timer.expires, now + max_delay) :
1340 try_to_del_timer_sync(&p->timer) >= 0)
1341 mod_timer(&p->timer, now + max_delay);
1345 spin_unlock(&br->multicast_lock);
1349 #if IS_ENABLED(CONFIG_IPV6)
1350 static int br_ip6_multicast_query(struct net_bridge *br,
1351 struct net_bridge_port *port,
1352 struct sk_buff *skb,
1355 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1356 struct mld_msg *mld;
1357 struct net_bridge_mdb_entry *mp;
1358 struct mld2_query *mld2q;
1359 struct net_bridge_port_group *p;
1360 struct net_bridge_port_group __rcu **pp;
1362 unsigned long max_delay;
1363 unsigned long now = jiffies;
1364 unsigned int offset = skb_transport_offset(skb);
1365 const struct in6_addr *group = NULL;
1366 bool is_general_query;
1369 spin_lock(&br->multicast_lock);
1370 if (!netif_running(br->dev) ||
1371 (port && port->state == BR_STATE_DISABLED))
1374 if (skb->len == offset + sizeof(*mld)) {
1375 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1379 mld = (struct mld_msg *) icmp6_hdr(skb);
1380 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1382 group = &mld->mld_mca;
1384 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1388 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1389 if (!mld2q->mld2q_nsrcs)
1390 group = &mld2q->mld2q_mca;
1392 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1395 is_general_query = group && ipv6_addr_any(group);
1397 if (is_general_query) {
1398 saddr.proto = htons(ETH_P_IPV6);
1399 saddr.u.ip6 = ip6h->saddr;
1401 br_multicast_query_received(br, port, &br->ip6_other_query,
1404 } else if (!group) {
1408 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1412 max_delay *= br->multicast_last_member_count;
1414 (timer_pending(&mp->timer) ?
1415 time_after(mp->timer.expires, now + max_delay) :
1416 try_to_del_timer_sync(&mp->timer) >= 0))
1417 mod_timer(&mp->timer, now + max_delay);
1419 for (pp = &mp->ports;
1420 (p = mlock_dereference(*pp, br)) != NULL;
1422 if (timer_pending(&p->timer) ?
1423 time_after(p->timer.expires, now + max_delay) :
1424 try_to_del_timer_sync(&p->timer) >= 0)
1425 mod_timer(&p->timer, now + max_delay);
1429 spin_unlock(&br->multicast_lock);
1435 br_multicast_leave_group(struct net_bridge *br,
1436 struct net_bridge_port *port,
1437 struct br_ip *group,
1438 struct bridge_mcast_other_query *other_query,
1439 struct bridge_mcast_own_query *own_query)
1441 struct net_bridge_mdb_htable *mdb;
1442 struct net_bridge_mdb_entry *mp;
1443 struct net_bridge_port_group *p;
1447 spin_lock(&br->multicast_lock);
1448 if (!netif_running(br->dev) ||
1449 (port && port->state == BR_STATE_DISABLED))
1452 mdb = mlock_dereference(br->mdb, br);
1453 mp = br_mdb_ip_get(mdb, group);
1457 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1458 struct net_bridge_port_group __rcu **pp;
1460 for (pp = &mp->ports;
1461 (p = mlock_dereference(*pp, br)) != NULL;
1463 if (p->port != port)
1466 rcu_assign_pointer(*pp, p->next);
1467 hlist_del_init(&p->mglist);
1468 del_timer(&p->timer);
1469 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1470 br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1473 if (!mp->ports && !mp->mglist &&
1474 netif_running(br->dev))
1475 mod_timer(&mp->timer, jiffies);
1480 if (timer_pending(&other_query->timer))
1483 if (br->multicast_querier) {
1484 __br_multicast_send_query(br, port, &mp->addr);
1486 time = jiffies + br->multicast_last_member_count *
1487 br->multicast_last_member_interval;
1489 mod_timer(&own_query->timer, time);
1491 for (p = mlock_dereference(mp->ports, br);
1493 p = mlock_dereference(p->next, br)) {
1494 if (p->port != port)
1497 if (!hlist_unhashed(&p->mglist) &&
1498 (timer_pending(&p->timer) ?
1499 time_after(p->timer.expires, time) :
1500 try_to_del_timer_sync(&p->timer) >= 0)) {
1501 mod_timer(&p->timer, time);
1509 time = now + br->multicast_last_member_count *
1510 br->multicast_last_member_interval;
1514 (timer_pending(&mp->timer) ?
1515 time_after(mp->timer.expires, time) :
1516 try_to_del_timer_sync(&mp->timer) >= 0)) {
1517 mod_timer(&mp->timer, time);
1523 for (p = mlock_dereference(mp->ports, br);
1525 p = mlock_dereference(p->next, br)) {
1526 if (p->port != port)
1529 if (!hlist_unhashed(&p->mglist) &&
1530 (timer_pending(&p->timer) ?
1531 time_after(p->timer.expires, time) :
1532 try_to_del_timer_sync(&p->timer) >= 0)) {
1533 mod_timer(&p->timer, time);
1539 spin_unlock(&br->multicast_lock);
1542 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1543 struct net_bridge_port *port,
1547 struct br_ip br_group;
1548 struct bridge_mcast_own_query *own_query;
1550 if (ipv4_is_local_multicast(group))
1553 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1555 br_group.u.ip4 = group;
1556 br_group.proto = htons(ETH_P_IP);
1559 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1563 #if IS_ENABLED(CONFIG_IPV6)
1564 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1565 struct net_bridge_port *port,
1566 const struct in6_addr *group,
1569 struct br_ip br_group;
1570 struct bridge_mcast_own_query *own_query;
1572 if (ipv6_addr_is_ll_all_nodes(group))
1575 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1577 br_group.u.ip6 = *group;
1578 br_group.proto = htons(ETH_P_IPV6);
1581 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1586 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1587 struct net_bridge_port *port,
1588 struct sk_buff *skb,
1591 struct sk_buff *skb_trimmed = NULL;
1595 err = ip_mc_check_igmp(skb, &skb_trimmed);
1597 if (err == -ENOMSG) {
1598 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1599 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1601 } else if (err < 0) {
1605 BR_INPUT_SKB_CB(skb)->igmp = 1;
1609 case IGMP_HOST_MEMBERSHIP_REPORT:
1610 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1611 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1612 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1614 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1615 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1617 case IGMP_HOST_MEMBERSHIP_QUERY:
1618 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1620 case IGMP_HOST_LEAVE_MESSAGE:
1621 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1625 if (skb_trimmed && skb_trimmed != skb)
1626 kfree_skb(skb_trimmed);
1631 #if IS_ENABLED(CONFIG_IPV6)
1632 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1633 struct net_bridge_port *port,
1634 struct sk_buff *skb,
1637 struct sk_buff *skb_trimmed = NULL;
1638 struct mld_msg *mld;
1641 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1643 if (err == -ENOMSG) {
1644 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1645 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1647 } else if (err < 0) {
1651 BR_INPUT_SKB_CB(skb)->igmp = 1;
1652 mld = (struct mld_msg *)skb_transport_header(skb);
1654 switch (mld->mld_type) {
1655 case ICMPV6_MGM_REPORT:
1656 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1657 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1659 case ICMPV6_MLD2_REPORT:
1660 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1662 case ICMPV6_MGM_QUERY:
1663 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1665 case ICMPV6_MGM_REDUCTION:
1666 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1670 if (skb_trimmed && skb_trimmed != skb)
1671 kfree_skb(skb_trimmed);
1677 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1678 struct sk_buff *skb, u16 vid)
1680 BR_INPUT_SKB_CB(skb)->igmp = 0;
1681 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1683 if (br->multicast_disabled)
1686 switch (skb->protocol) {
1687 case htons(ETH_P_IP):
1688 return br_multicast_ipv4_rcv(br, port, skb, vid);
1689 #if IS_ENABLED(CONFIG_IPV6)
1690 case htons(ETH_P_IPV6):
1691 return br_multicast_ipv6_rcv(br, port, skb, vid);
1698 static void br_multicast_query_expired(struct net_bridge *br,
1699 struct bridge_mcast_own_query *query,
1700 struct bridge_mcast_querier *querier)
1702 spin_lock(&br->multicast_lock);
1703 if (query->startup_sent < br->multicast_startup_query_count)
1704 query->startup_sent++;
1706 RCU_INIT_POINTER(querier->port, NULL);
1707 br_multicast_send_query(br, NULL, query);
1708 spin_unlock(&br->multicast_lock);
1711 static void br_ip4_multicast_query_expired(unsigned long data)
1713 struct net_bridge *br = (void *)data;
1715 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1718 #if IS_ENABLED(CONFIG_IPV6)
1719 static void br_ip6_multicast_query_expired(unsigned long data)
1721 struct net_bridge *br = (void *)data;
1723 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1727 void br_multicast_init(struct net_bridge *br)
1729 br->hash_elasticity = 4;
1732 br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1733 br->multicast_querier = 0;
1734 br->multicast_query_use_ifaddr = 0;
1735 br->multicast_last_member_count = 2;
1736 br->multicast_startup_query_count = 2;
1738 br->multicast_last_member_interval = HZ;
1739 br->multicast_query_response_interval = 10 * HZ;
1740 br->multicast_startup_query_interval = 125 * HZ / 4;
1741 br->multicast_query_interval = 125 * HZ;
1742 br->multicast_querier_interval = 255 * HZ;
1743 br->multicast_membership_interval = 260 * HZ;
1745 br->ip4_other_query.delay_time = 0;
1746 br->ip4_querier.port = NULL;
1747 #if IS_ENABLED(CONFIG_IPV6)
1748 br->ip6_other_query.delay_time = 0;
1749 br->ip6_querier.port = NULL;
1751 br->has_ipv6_addr = 1;
1753 spin_lock_init(&br->multicast_lock);
1754 setup_timer(&br->multicast_router_timer,
1755 br_multicast_local_router_expired, 0);
1756 setup_timer(&br->ip4_other_query.timer,
1757 br_ip4_multicast_querier_expired, (unsigned long)br);
1758 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1760 #if IS_ENABLED(CONFIG_IPV6)
1761 setup_timer(&br->ip6_other_query.timer,
1762 br_ip6_multicast_querier_expired, (unsigned long)br);
1763 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1768 static void __br_multicast_open(struct net_bridge *br,
1769 struct bridge_mcast_own_query *query)
1771 query->startup_sent = 0;
1773 if (br->multicast_disabled)
1776 mod_timer(&query->timer, jiffies);
1779 void br_multicast_open(struct net_bridge *br)
1781 __br_multicast_open(br, &br->ip4_own_query);
1782 #if IS_ENABLED(CONFIG_IPV6)
1783 __br_multicast_open(br, &br->ip6_own_query);
1787 void br_multicast_stop(struct net_bridge *br)
1789 del_timer_sync(&br->multicast_router_timer);
1790 del_timer_sync(&br->ip4_other_query.timer);
1791 del_timer_sync(&br->ip4_own_query.timer);
1792 #if IS_ENABLED(CONFIG_IPV6)
1793 del_timer_sync(&br->ip6_other_query.timer);
1794 del_timer_sync(&br->ip6_own_query.timer);
1798 void br_multicast_dev_del(struct net_bridge *br)
1800 struct net_bridge_mdb_htable *mdb;
1801 struct net_bridge_mdb_entry *mp;
1802 struct hlist_node *n;
1806 spin_lock_bh(&br->multicast_lock);
1807 mdb = mlock_dereference(br->mdb, br);
1814 for (i = 0; i < mdb->max; i++) {
1815 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1817 del_timer(&mp->timer);
1818 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1823 spin_unlock_bh(&br->multicast_lock);
1825 spin_lock_bh(&br->multicast_lock);
1830 call_rcu_bh(&mdb->rcu, br_mdb_free);
1833 spin_unlock_bh(&br->multicast_lock);
1836 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1840 spin_lock_bh(&br->multicast_lock);
1843 case MDB_RTR_TYPE_DISABLED:
1844 case MDB_RTR_TYPE_PERM:
1845 del_timer(&br->multicast_router_timer);
1847 case MDB_RTR_TYPE_TEMP_QUERY:
1848 br->multicast_router = val;
1853 spin_unlock_bh(&br->multicast_lock);
1858 static void __del_port_router(struct net_bridge_port *p)
1860 if (hlist_unhashed(&p->rlist))
1862 hlist_del_init_rcu(&p->rlist);
1863 br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1866 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1868 struct net_bridge *br = p->br;
1869 unsigned long now = jiffies;
1872 spin_lock(&br->multicast_lock);
1873 if (p->multicast_router == val) {
1874 /* Refresh the temp router port timer */
1875 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1876 mod_timer(&p->multicast_router_timer,
1877 now + br->multicast_querier_interval);
1882 case MDB_RTR_TYPE_DISABLED:
1883 p->multicast_router = MDB_RTR_TYPE_DISABLED;
1884 __del_port_router(p);
1885 del_timer(&p->multicast_router_timer);
1887 case MDB_RTR_TYPE_TEMP_QUERY:
1888 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1889 __del_port_router(p);
1891 case MDB_RTR_TYPE_PERM:
1892 p->multicast_router = MDB_RTR_TYPE_PERM;
1893 del_timer(&p->multicast_router_timer);
1894 br_multicast_add_router(br, p);
1896 case MDB_RTR_TYPE_TEMP:
1897 p->multicast_router = MDB_RTR_TYPE_TEMP;
1898 br_multicast_mark_router(br, p);
1905 spin_unlock(&br->multicast_lock);
1910 static void br_multicast_start_querier(struct net_bridge *br,
1911 struct bridge_mcast_own_query *query)
1913 struct net_bridge_port *port;
1915 __br_multicast_open(br, query);
1917 list_for_each_entry(port, &br->port_list, list) {
1918 if (port->state == BR_STATE_DISABLED ||
1919 port->state == BR_STATE_BLOCKING)
1922 if (query == &br->ip4_own_query)
1923 br_multicast_enable(&port->ip4_own_query);
1924 #if IS_ENABLED(CONFIG_IPV6)
1926 br_multicast_enable(&port->ip6_own_query);
1931 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1934 struct net_bridge_mdb_htable *mdb;
1936 spin_lock_bh(&br->multicast_lock);
1937 if (br->multicast_disabled == !val)
1940 br->multicast_disabled = !val;
1941 if (br->multicast_disabled)
1944 if (!netif_running(br->dev))
1947 mdb = mlock_dereference(br->mdb, br);
1952 br->multicast_disabled = !!val;
1956 err = br_mdb_rehash(&br->mdb, mdb->max,
1957 br->hash_elasticity);
1962 br_multicast_start_querier(br, &br->ip4_own_query);
1963 #if IS_ENABLED(CONFIG_IPV6)
1964 br_multicast_start_querier(br, &br->ip6_own_query);
1968 spin_unlock_bh(&br->multicast_lock);
1973 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1975 unsigned long max_delay;
1979 spin_lock_bh(&br->multicast_lock);
1980 if (br->multicast_querier == val)
1983 br->multicast_querier = val;
1987 max_delay = br->multicast_query_response_interval;
1989 if (!timer_pending(&br->ip4_other_query.timer))
1990 br->ip4_other_query.delay_time = jiffies + max_delay;
1992 br_multicast_start_querier(br, &br->ip4_own_query);
1994 #if IS_ENABLED(CONFIG_IPV6)
1995 if (!timer_pending(&br->ip6_other_query.timer))
1996 br->ip6_other_query.delay_time = jiffies + max_delay;
1998 br_multicast_start_querier(br, &br->ip6_own_query);
2002 spin_unlock_bh(&br->multicast_lock);
2007 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2011 struct net_bridge_mdb_htable *mdb;
2013 spin_lock_bh(&br->multicast_lock);
2014 if (!is_power_of_2(val))
2017 mdb = mlock_dereference(br->mdb, br);
2018 if (mdb && val < mdb->size)
2034 err = br_mdb_rehash(&br->mdb, br->hash_max,
2035 br->hash_elasticity);
2041 spin_unlock_bh(&br->multicast_lock);
2047 * br_multicast_list_adjacent - Returns snooped multicast addresses
2048 * @dev: The bridge port adjacent to which to retrieve addresses
2049 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2051 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2052 * snooping feature on all bridge ports of dev's bridge device, excluding
2053 * the addresses from dev itself.
2055 * Returns the number of items added to br_ip_list.
2058 * - br_ip_list needs to be initialized by caller
2059 * - br_ip_list might contain duplicates in the end
2060 * (needs to be taken care of by caller)
2061 * - br_ip_list needs to be freed by caller
2063 int br_multicast_list_adjacent(struct net_device *dev,
2064 struct list_head *br_ip_list)
2066 struct net_bridge *br;
2067 struct net_bridge_port *port;
2068 struct net_bridge_port_group *group;
2069 struct br_ip_list *entry;
2073 if (!br_ip_list || !br_port_exists(dev))
2076 port = br_port_get_rcu(dev);
2077 if (!port || !port->br)
2082 list_for_each_entry_rcu(port, &br->port_list, list) {
2083 if (!port->dev || port->dev == dev)
2086 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2087 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2091 entry->addr = group->addr;
2092 list_add(&entry->list, br_ip_list);
2101 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2104 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2105 * @dev: The bridge port providing the bridge on which to check for a querier
2106 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2108 * Checks whether the given interface has a bridge on top and if so returns
2109 * true if a valid querier exists anywhere on the bridged link layer.
2110 * Otherwise returns false.
2112 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2114 struct net_bridge *br;
2115 struct net_bridge_port *port;
2120 if (!br_port_exists(dev))
2123 port = br_port_get_rcu(dev);
2124 if (!port || !port->br)
2129 memset(ð, 0, sizeof(eth));
2130 eth.h_proto = htons(proto);
2132 ret = br_multicast_querier_exists(br, ð);
2138 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2141 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2142 * @dev: The bridge port adjacent to which to check for a querier
2143 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2145 * Checks whether the given interface has a bridge on top and if so returns
2146 * true if a selected querier is behind one of the other ports of this
2147 * bridge. Otherwise returns false.
2149 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2151 struct net_bridge *br;
2152 struct net_bridge_port *port;
2156 if (!br_port_exists(dev))
2159 port = br_port_get_rcu(dev);
2160 if (!port || !port->br)
2167 if (!timer_pending(&br->ip4_other_query.timer) ||
2168 rcu_dereference(br->ip4_querier.port) == port)
2171 #if IS_ENABLED(CONFIG_IPV6)
2173 if (!timer_pending(&br->ip6_other_query.timer) ||
2174 rcu_dereference(br->ip6_querier.port) == port)
2187 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);