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, RTM_DELMDB);
287 call_rcu_bh(&p->rcu, br_multicast_free_pg);
289 if (!mp->ports && !mp->mglist &&
290 netif_running(br->dev))
291 mod_timer(&mp->timer, jiffies);
299 static void br_multicast_port_group_expired(unsigned long data)
301 struct net_bridge_port_group *pg = (void *)data;
302 struct net_bridge *br = pg->port->br;
304 spin_lock(&br->multicast_lock);
305 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
306 hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
309 br_multicast_del_pg(br, pg);
312 spin_unlock(&br->multicast_lock);
315 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
318 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
319 struct net_bridge_mdb_htable *mdb;
322 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
329 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
335 mdb->size = old ? old->size : 0;
336 mdb->ver = old ? old->ver ^ 1 : 0;
338 if (!old || elasticity)
339 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
341 mdb->secret = old->secret;
346 err = br_mdb_copy(mdb, old, elasticity);
354 call_rcu_bh(&mdb->rcu, br_mdb_free);
357 rcu_assign_pointer(*mdbp, mdb);
362 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
370 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
375 skb->protocol = htons(ETH_P_IP);
377 skb_reset_mac_header(skb);
380 ether_addr_copy(eth->h_source, br->dev->dev_addr);
383 eth->h_dest[2] = 0x5e;
387 eth->h_proto = htons(ETH_P_IP);
388 skb_put(skb, sizeof(*eth));
390 skb_set_network_header(skb, skb->len);
396 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
398 iph->frag_off = htons(IP_DF);
400 iph->protocol = IPPROTO_IGMP;
401 iph->saddr = br->multicast_query_use_ifaddr ?
402 inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
403 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
404 ((u8 *)&iph[1])[0] = IPOPT_RA;
405 ((u8 *)&iph[1])[1] = 4;
406 ((u8 *)&iph[1])[2] = 0;
407 ((u8 *)&iph[1])[3] = 0;
411 skb_set_transport_header(skb, skb->len);
413 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
414 ih->code = (group ? br->multicast_last_member_interval :
415 br->multicast_query_response_interval) /
416 (HZ / IGMP_TIMER_SCALE);
419 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
420 skb_put(skb, sizeof(*ih));
422 __skb_pull(skb, sizeof(*eth));
428 #if IS_ENABLED(CONFIG_IPV6)
429 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
430 const struct in6_addr *group)
433 struct ipv6hdr *ip6h;
434 struct mld_msg *mldq;
437 unsigned long interval;
439 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
444 skb->protocol = htons(ETH_P_IPV6);
446 /* Ethernet header */
447 skb_reset_mac_header(skb);
450 ether_addr_copy(eth->h_source, br->dev->dev_addr);
451 eth->h_proto = htons(ETH_P_IPV6);
452 skb_put(skb, sizeof(*eth));
454 /* IPv6 header + HbH option */
455 skb_set_network_header(skb, skb->len);
456 ip6h = ipv6_hdr(skb);
458 *(__force __be32 *)ip6h = htonl(0x60000000);
459 ip6h->payload_len = htons(8 + sizeof(*mldq));
460 ip6h->nexthdr = IPPROTO_HOPOPTS;
462 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
463 if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
468 ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
470 hopopt = (u8 *)(ip6h + 1);
471 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
472 hopopt[1] = 0; /* length of HbH */
473 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
474 hopopt[3] = 2; /* Length of RA Option */
475 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
477 hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
478 hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
480 skb_put(skb, sizeof(*ip6h) + 8);
483 skb_set_transport_header(skb, skb->len);
484 mldq = (struct mld_msg *) icmp6_hdr(skb);
486 interval = ipv6_addr_any(group) ?
487 br->multicast_query_response_interval :
488 br->multicast_last_member_interval;
490 mldq->mld_type = ICMPV6_MGM_QUERY;
493 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
494 mldq->mld_reserved = 0;
495 mldq->mld_mca = *group;
498 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
499 sizeof(*mldq), IPPROTO_ICMPV6,
502 skb_put(skb, sizeof(*mldq));
504 __skb_pull(skb, sizeof(*eth));
511 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
514 switch (addr->proto) {
515 case htons(ETH_P_IP):
516 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
517 #if IS_ENABLED(CONFIG_IPV6)
518 case htons(ETH_P_IPV6):
519 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
525 static struct net_bridge_mdb_entry *br_multicast_get_group(
526 struct net_bridge *br, struct net_bridge_port *port,
527 struct br_ip *group, int hash)
529 struct net_bridge_mdb_htable *mdb;
530 struct net_bridge_mdb_entry *mp;
531 unsigned int count = 0;
536 mdb = rcu_dereference_protected(br->mdb, 1);
537 hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
539 if (unlikely(br_ip_equal(group, &mp->addr)))
546 if (unlikely(count > br->hash_elasticity && count)) {
548 br_info(br, "Multicast hash table "
549 "chain limit reached: %s\n",
550 port ? port->dev->name : br->dev->name);
552 elasticity = br->hash_elasticity;
555 if (mdb->size >= max) {
557 if (unlikely(max > br->hash_max)) {
558 br_warn(br, "Multicast hash table maximum of %d "
559 "reached, disabling snooping: %s\n",
561 port ? port->dev->name : br->dev->name);
564 br->multicast_disabled = 1;
569 if (max > mdb->max || elasticity) {
572 br_info(br, "Multicast hash table "
574 port ? port->dev->name : br->dev->name);
579 err = br_mdb_rehash(&br->mdb, max, elasticity);
581 br_warn(br, "Cannot rehash multicast "
582 "hash table, disabling snooping: %s, %d, %d\n",
583 port ? port->dev->name : br->dev->name,
599 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
600 struct net_bridge_port *port, struct br_ip *group)
602 struct net_bridge_mdb_htable *mdb;
603 struct net_bridge_mdb_entry *mp;
607 mdb = rcu_dereference_protected(br->mdb, 1);
609 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
615 hash = br_ip_hash(mdb, group);
616 mp = br_multicast_get_group(br, port, group, hash);
617 switch (PTR_ERR(mp)) {
623 mdb = rcu_dereference_protected(br->mdb, 1);
624 hash = br_ip_hash(mdb, group);
631 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
633 return ERR_PTR(-ENOMEM);
637 setup_timer(&mp->timer, br_multicast_group_expired,
640 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
647 struct net_bridge_port_group *br_multicast_new_port_group(
648 struct net_bridge_port *port,
650 struct net_bridge_port_group __rcu *next,
653 struct net_bridge_port_group *p;
655 p = kzalloc(sizeof(*p), GFP_ATOMIC);
662 rcu_assign_pointer(p->next, next);
663 hlist_add_head(&p->mglist, &port->mglist);
664 setup_timer(&p->timer, br_multicast_port_group_expired,
669 static int br_multicast_add_group(struct net_bridge *br,
670 struct net_bridge_port *port,
673 struct net_bridge_mdb_entry *mp;
674 struct net_bridge_port_group *p;
675 struct net_bridge_port_group __rcu **pp;
676 unsigned long now = jiffies;
679 spin_lock(&br->multicast_lock);
680 if (!netif_running(br->dev) ||
681 (port && port->state == BR_STATE_DISABLED))
684 mp = br_multicast_new_group(br, port, group);
691 mod_timer(&mp->timer, now + br->multicast_membership_interval);
695 for (pp = &mp->ports;
696 (p = mlock_dereference(*pp, br)) != NULL;
700 if ((unsigned long)p->port < (unsigned long)port)
704 p = br_multicast_new_port_group(port, group, *pp, 0);
707 rcu_assign_pointer(*pp, p);
708 br_mdb_notify(br->dev, p, RTM_NEWMDB);
711 mod_timer(&p->timer, now + br->multicast_membership_interval);
716 spin_unlock(&br->multicast_lock);
720 static int br_ip4_multicast_add_group(struct net_bridge *br,
721 struct net_bridge_port *port,
725 struct br_ip br_group;
727 if (ipv4_is_local_multicast(group))
730 br_group.u.ip4 = group;
731 br_group.proto = htons(ETH_P_IP);
734 return br_multicast_add_group(br, port, &br_group);
737 #if IS_ENABLED(CONFIG_IPV6)
738 static int br_ip6_multicast_add_group(struct net_bridge *br,
739 struct net_bridge_port *port,
740 const struct in6_addr *group,
743 struct br_ip br_group;
745 if (ipv6_addr_is_ll_all_nodes(group))
748 br_group.u.ip6 = *group;
749 br_group.proto = htons(ETH_P_IPV6);
752 return br_multicast_add_group(br, port, &br_group);
756 static void br_multicast_router_expired(unsigned long data)
758 struct net_bridge_port *port = (void *)data;
759 struct net_bridge *br = port->br;
761 spin_lock(&br->multicast_lock);
762 if (port->multicast_router != 1 ||
763 timer_pending(&port->multicast_router_timer) ||
764 hlist_unhashed(&port->rlist))
767 hlist_del_init_rcu(&port->rlist);
768 br_rtr_notify(br->dev, port, RTM_DELMDB);
771 spin_unlock(&br->multicast_lock);
774 static void br_multicast_local_router_expired(unsigned long data)
778 static void br_multicast_querier_expired(struct net_bridge *br,
779 struct bridge_mcast_own_query *query)
781 spin_lock(&br->multicast_lock);
782 if (!netif_running(br->dev) || br->multicast_disabled)
785 br_multicast_start_querier(br, query);
788 spin_unlock(&br->multicast_lock);
791 static void br_ip4_multicast_querier_expired(unsigned long data)
793 struct net_bridge *br = (void *)data;
795 br_multicast_querier_expired(br, &br->ip4_own_query);
798 #if IS_ENABLED(CONFIG_IPV6)
799 static void br_ip6_multicast_querier_expired(unsigned long data)
801 struct net_bridge *br = (void *)data;
803 br_multicast_querier_expired(br, &br->ip6_own_query);
807 static void br_multicast_select_own_querier(struct net_bridge *br,
811 if (ip->proto == htons(ETH_P_IP))
812 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
813 #if IS_ENABLED(CONFIG_IPV6)
815 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
819 static void __br_multicast_send_query(struct net_bridge *br,
820 struct net_bridge_port *port,
825 skb = br_multicast_alloc_query(br, ip);
830 skb->dev = port->dev;
831 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
832 dev_net(port->dev), NULL, skb, NULL, skb->dev,
833 br_dev_queue_push_xmit);
835 br_multicast_select_own_querier(br, ip, skb);
840 static void br_multicast_send_query(struct net_bridge *br,
841 struct net_bridge_port *port,
842 struct bridge_mcast_own_query *own_query)
845 struct br_ip br_group;
846 struct bridge_mcast_other_query *other_query = NULL;
848 if (!netif_running(br->dev) || br->multicast_disabled ||
849 !br->multicast_querier)
852 memset(&br_group.u, 0, sizeof(br_group.u));
854 if (port ? (own_query == &port->ip4_own_query) :
855 (own_query == &br->ip4_own_query)) {
856 other_query = &br->ip4_other_query;
857 br_group.proto = htons(ETH_P_IP);
858 #if IS_ENABLED(CONFIG_IPV6)
860 other_query = &br->ip6_other_query;
861 br_group.proto = htons(ETH_P_IPV6);
865 if (!other_query || timer_pending(&other_query->timer))
868 __br_multicast_send_query(br, port, &br_group);
871 time += own_query->startup_sent < br->multicast_startup_query_count ?
872 br->multicast_startup_query_interval :
873 br->multicast_query_interval;
874 mod_timer(&own_query->timer, time);
878 br_multicast_port_query_expired(struct net_bridge_port *port,
879 struct bridge_mcast_own_query *query)
881 struct net_bridge *br = port->br;
883 spin_lock(&br->multicast_lock);
884 if (port->state == BR_STATE_DISABLED ||
885 port->state == BR_STATE_BLOCKING)
888 if (query->startup_sent < br->multicast_startup_query_count)
889 query->startup_sent++;
891 br_multicast_send_query(port->br, port, query);
894 spin_unlock(&br->multicast_lock);
897 static void br_ip4_multicast_port_query_expired(unsigned long data)
899 struct net_bridge_port *port = (void *)data;
901 br_multicast_port_query_expired(port, &port->ip4_own_query);
904 #if IS_ENABLED(CONFIG_IPV6)
905 static void br_ip6_multicast_port_query_expired(unsigned long data)
907 struct net_bridge_port *port = (void *)data;
909 br_multicast_port_query_expired(port, &port->ip6_own_query);
913 void br_multicast_add_port(struct net_bridge_port *port)
915 port->multicast_router = 1;
917 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
918 (unsigned long)port);
919 setup_timer(&port->ip4_own_query.timer,
920 br_ip4_multicast_port_query_expired, (unsigned long)port);
921 #if IS_ENABLED(CONFIG_IPV6)
922 setup_timer(&port->ip6_own_query.timer,
923 br_ip6_multicast_port_query_expired, (unsigned long)port);
927 void br_multicast_del_port(struct net_bridge_port *port)
929 struct net_bridge *br = port->br;
930 struct net_bridge_port_group *pg;
931 struct hlist_node *n;
933 /* Take care of the remaining groups, only perm ones should be left */
934 spin_lock_bh(&br->multicast_lock);
935 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
936 br_multicast_del_pg(br, pg);
937 spin_unlock_bh(&br->multicast_lock);
938 del_timer_sync(&port->multicast_router_timer);
941 static void br_multicast_enable(struct bridge_mcast_own_query *query)
943 query->startup_sent = 0;
945 if (try_to_del_timer_sync(&query->timer) >= 0 ||
946 del_timer(&query->timer))
947 mod_timer(&query->timer, jiffies);
950 void br_multicast_enable_port(struct net_bridge_port *port)
952 struct net_bridge *br = port->br;
954 spin_lock(&br->multicast_lock);
955 if (br->multicast_disabled || !netif_running(br->dev))
958 br_multicast_enable(&port->ip4_own_query);
959 #if IS_ENABLED(CONFIG_IPV6)
960 br_multicast_enable(&port->ip6_own_query);
962 if (port->multicast_router == 2 && hlist_unhashed(&port->rlist))
963 br_multicast_add_router(br, port);
966 spin_unlock(&br->multicast_lock);
969 void br_multicast_disable_port(struct net_bridge_port *port)
971 struct net_bridge *br = port->br;
972 struct net_bridge_port_group *pg;
973 struct hlist_node *n;
975 spin_lock(&br->multicast_lock);
976 hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
977 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
978 br_multicast_del_pg(br, pg);
980 if (!hlist_unhashed(&port->rlist)) {
981 hlist_del_init_rcu(&port->rlist);
982 br_rtr_notify(br->dev, port, RTM_DELMDB);
984 del_timer(&port->multicast_router_timer);
985 del_timer(&port->ip4_own_query.timer);
986 #if IS_ENABLED(CONFIG_IPV6)
987 del_timer(&port->ip6_own_query.timer);
989 spin_unlock(&br->multicast_lock);
992 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
993 struct net_bridge_port *port,
997 struct igmpv3_report *ih;
998 struct igmpv3_grec *grec;
1006 ih = igmpv3_report_hdr(skb);
1007 num = ntohs(ih->ngrec);
1008 len = skb_transport_offset(skb) + sizeof(*ih);
1010 for (i = 0; i < num; i++) {
1011 len += sizeof(*grec);
1012 if (!pskb_may_pull(skb, len))
1015 grec = (void *)(skb->data + len - sizeof(*grec));
1016 group = grec->grec_mca;
1017 type = grec->grec_type;
1019 len += ntohs(grec->grec_nsrcs) * 4;
1020 if (!pskb_may_pull(skb, len))
1023 /* We treat this as an IGMPv2 report for now. */
1025 case IGMPV3_MODE_IS_INCLUDE:
1026 case IGMPV3_MODE_IS_EXCLUDE:
1027 case IGMPV3_CHANGE_TO_INCLUDE:
1028 case IGMPV3_CHANGE_TO_EXCLUDE:
1029 case IGMPV3_ALLOW_NEW_SOURCES:
1030 case IGMPV3_BLOCK_OLD_SOURCES:
1037 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1038 type == IGMPV3_MODE_IS_INCLUDE) &&
1039 ntohs(grec->grec_nsrcs) == 0) {
1040 br_ip4_multicast_leave_group(br, port, group, vid);
1042 err = br_ip4_multicast_add_group(br, port, group, vid);
1051 #if IS_ENABLED(CONFIG_IPV6)
1052 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1053 struct net_bridge_port *port,
1054 struct sk_buff *skb,
1057 struct icmp6hdr *icmp6h;
1058 struct mld2_grec *grec;
1064 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1067 icmp6h = icmp6_hdr(skb);
1068 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1069 len = skb_transport_offset(skb) + sizeof(*icmp6h);
1071 for (i = 0; i < num; i++) {
1072 __be16 *nsrcs, _nsrcs;
1074 nsrcs = skb_header_pointer(skb,
1075 len + offsetof(struct mld2_grec,
1077 sizeof(_nsrcs), &_nsrcs);
1081 if (!pskb_may_pull(skb,
1082 len + sizeof(*grec) +
1083 sizeof(struct in6_addr) * ntohs(*nsrcs)))
1086 grec = (struct mld2_grec *)(skb->data + len);
1087 len += sizeof(*grec) +
1088 sizeof(struct in6_addr) * ntohs(*nsrcs);
1090 /* We treat these as MLDv1 reports for now. */
1091 switch (grec->grec_type) {
1092 case MLD2_MODE_IS_INCLUDE:
1093 case MLD2_MODE_IS_EXCLUDE:
1094 case MLD2_CHANGE_TO_INCLUDE:
1095 case MLD2_CHANGE_TO_EXCLUDE:
1096 case MLD2_ALLOW_NEW_SOURCES:
1097 case MLD2_BLOCK_OLD_SOURCES:
1104 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1105 grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1106 ntohs(*nsrcs) == 0) {
1107 br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1110 err = br_ip6_multicast_add_group(br, port,
1111 &grec->grec_mca, vid);
1121 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1122 struct net_bridge_port *port,
1125 if (!timer_pending(&br->ip4_own_query.timer) &&
1126 !timer_pending(&br->ip4_other_query.timer))
1129 if (!br->ip4_querier.addr.u.ip4)
1132 if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1138 br->ip4_querier.addr.u.ip4 = saddr;
1140 /* update protected by general multicast_lock by caller */
1141 rcu_assign_pointer(br->ip4_querier.port, port);
1146 #if IS_ENABLED(CONFIG_IPV6)
1147 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1148 struct net_bridge_port *port,
1149 struct in6_addr *saddr)
1151 if (!timer_pending(&br->ip6_own_query.timer) &&
1152 !timer_pending(&br->ip6_other_query.timer))
1155 if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1161 br->ip6_querier.addr.u.ip6 = *saddr;
1163 /* update protected by general multicast_lock by caller */
1164 rcu_assign_pointer(br->ip6_querier.port, port);
1170 static bool br_multicast_select_querier(struct net_bridge *br,
1171 struct net_bridge_port *port,
1172 struct br_ip *saddr)
1174 switch (saddr->proto) {
1175 case htons(ETH_P_IP):
1176 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1177 #if IS_ENABLED(CONFIG_IPV6)
1178 case htons(ETH_P_IPV6):
1179 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1187 br_multicast_update_query_timer(struct net_bridge *br,
1188 struct bridge_mcast_other_query *query,
1189 unsigned long max_delay)
1191 if (!timer_pending(&query->timer))
1192 query->delay_time = jiffies + max_delay;
1194 mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1198 * Add port to router_list
1199 * list is maintained ordered by pointer value
1200 * and locked by br->multicast_lock and RCU
1202 static void br_multicast_add_router(struct net_bridge *br,
1203 struct net_bridge_port *port)
1205 struct net_bridge_port *p;
1206 struct hlist_node *slot = NULL;
1208 if (!hlist_unhashed(&port->rlist))
1211 hlist_for_each_entry(p, &br->router_list, rlist) {
1212 if ((unsigned long) port >= (unsigned long) p)
1218 hlist_add_behind_rcu(&port->rlist, slot);
1220 hlist_add_head_rcu(&port->rlist, &br->router_list);
1221 br_rtr_notify(br->dev, port, RTM_NEWMDB);
1224 static void br_multicast_mark_router(struct net_bridge *br,
1225 struct net_bridge_port *port)
1227 unsigned long now = jiffies;
1230 if (br->multicast_router == 1)
1231 mod_timer(&br->multicast_router_timer,
1232 now + br->multicast_querier_interval);
1236 if (port->multicast_router != 1)
1239 br_multicast_add_router(br, port);
1241 mod_timer(&port->multicast_router_timer,
1242 now + br->multicast_querier_interval);
1245 static void br_multicast_query_received(struct net_bridge *br,
1246 struct net_bridge_port *port,
1247 struct bridge_mcast_other_query *query,
1248 struct br_ip *saddr,
1249 unsigned long max_delay)
1251 if (!br_multicast_select_querier(br, port, saddr))
1254 br_multicast_update_query_timer(br, query, max_delay);
1255 br_multicast_mark_router(br, port);
1258 static int br_ip4_multicast_query(struct net_bridge *br,
1259 struct net_bridge_port *port,
1260 struct sk_buff *skb,
1263 const struct iphdr *iph = ip_hdr(skb);
1264 struct igmphdr *ih = igmp_hdr(skb);
1265 struct net_bridge_mdb_entry *mp;
1266 struct igmpv3_query *ih3;
1267 struct net_bridge_port_group *p;
1268 struct net_bridge_port_group __rcu **pp;
1270 unsigned long max_delay;
1271 unsigned long now = jiffies;
1275 spin_lock(&br->multicast_lock);
1276 if (!netif_running(br->dev) ||
1277 (port && port->state == BR_STATE_DISABLED))
1282 if (skb->len == sizeof(*ih)) {
1283 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1286 max_delay = 10 * HZ;
1289 } else if (skb->len >= sizeof(*ih3)) {
1290 ih3 = igmpv3_query_hdr(skb);
1294 max_delay = ih3->code ?
1295 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1301 saddr.proto = htons(ETH_P_IP);
1302 saddr.u.ip4 = iph->saddr;
1304 br_multicast_query_received(br, port, &br->ip4_other_query,
1309 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1313 max_delay *= br->multicast_last_member_count;
1316 (timer_pending(&mp->timer) ?
1317 time_after(mp->timer.expires, now + max_delay) :
1318 try_to_del_timer_sync(&mp->timer) >= 0))
1319 mod_timer(&mp->timer, now + max_delay);
1321 for (pp = &mp->ports;
1322 (p = mlock_dereference(*pp, br)) != NULL;
1324 if (timer_pending(&p->timer) ?
1325 time_after(p->timer.expires, now + max_delay) :
1326 try_to_del_timer_sync(&p->timer) >= 0)
1327 mod_timer(&p->timer, now + max_delay);
1331 spin_unlock(&br->multicast_lock);
1335 #if IS_ENABLED(CONFIG_IPV6)
1336 static int br_ip6_multicast_query(struct net_bridge *br,
1337 struct net_bridge_port *port,
1338 struct sk_buff *skb,
1341 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1342 struct mld_msg *mld;
1343 struct net_bridge_mdb_entry *mp;
1344 struct mld2_query *mld2q;
1345 struct net_bridge_port_group *p;
1346 struct net_bridge_port_group __rcu **pp;
1348 unsigned long max_delay;
1349 unsigned long now = jiffies;
1350 const struct in6_addr *group = NULL;
1351 bool is_general_query;
1354 spin_lock(&br->multicast_lock);
1355 if (!netif_running(br->dev) ||
1356 (port && port->state == BR_STATE_DISABLED))
1359 if (skb->len == sizeof(*mld)) {
1360 if (!pskb_may_pull(skb, sizeof(*mld))) {
1364 mld = (struct mld_msg *) icmp6_hdr(skb);
1365 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1367 group = &mld->mld_mca;
1369 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1373 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1374 if (!mld2q->mld2q_nsrcs)
1375 group = &mld2q->mld2q_mca;
1377 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1380 is_general_query = group && ipv6_addr_any(group);
1382 if (is_general_query) {
1383 saddr.proto = htons(ETH_P_IPV6);
1384 saddr.u.ip6 = ip6h->saddr;
1386 br_multicast_query_received(br, port, &br->ip6_other_query,
1389 } else if (!group) {
1393 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1397 max_delay *= br->multicast_last_member_count;
1399 (timer_pending(&mp->timer) ?
1400 time_after(mp->timer.expires, now + max_delay) :
1401 try_to_del_timer_sync(&mp->timer) >= 0))
1402 mod_timer(&mp->timer, now + max_delay);
1404 for (pp = &mp->ports;
1405 (p = mlock_dereference(*pp, br)) != NULL;
1407 if (timer_pending(&p->timer) ?
1408 time_after(p->timer.expires, now + max_delay) :
1409 try_to_del_timer_sync(&p->timer) >= 0)
1410 mod_timer(&p->timer, now + max_delay);
1414 spin_unlock(&br->multicast_lock);
1420 br_multicast_leave_group(struct net_bridge *br,
1421 struct net_bridge_port *port,
1422 struct br_ip *group,
1423 struct bridge_mcast_other_query *other_query,
1424 struct bridge_mcast_own_query *own_query)
1426 struct net_bridge_mdb_htable *mdb;
1427 struct net_bridge_mdb_entry *mp;
1428 struct net_bridge_port_group *p;
1432 spin_lock(&br->multicast_lock);
1433 if (!netif_running(br->dev) ||
1434 (port && port->state == BR_STATE_DISABLED))
1437 mdb = mlock_dereference(br->mdb, br);
1438 mp = br_mdb_ip_get(mdb, group);
1442 if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1443 struct net_bridge_port_group __rcu **pp;
1445 for (pp = &mp->ports;
1446 (p = mlock_dereference(*pp, br)) != NULL;
1448 if (p->port != port)
1451 rcu_assign_pointer(*pp, p->next);
1452 hlist_del_init(&p->mglist);
1453 del_timer(&p->timer);
1454 call_rcu_bh(&p->rcu, br_multicast_free_pg);
1455 br_mdb_notify(br->dev, p, RTM_DELMDB);
1457 if (!mp->ports && !mp->mglist &&
1458 netif_running(br->dev))
1459 mod_timer(&mp->timer, jiffies);
1464 if (timer_pending(&other_query->timer))
1467 if (br->multicast_querier) {
1468 __br_multicast_send_query(br, port, &mp->addr);
1470 time = jiffies + br->multicast_last_member_count *
1471 br->multicast_last_member_interval;
1473 mod_timer(&own_query->timer, time);
1475 for (p = mlock_dereference(mp->ports, br);
1477 p = mlock_dereference(p->next, br)) {
1478 if (p->port != port)
1481 if (!hlist_unhashed(&p->mglist) &&
1482 (timer_pending(&p->timer) ?
1483 time_after(p->timer.expires, time) :
1484 try_to_del_timer_sync(&p->timer) >= 0)) {
1485 mod_timer(&p->timer, time);
1493 time = now + br->multicast_last_member_count *
1494 br->multicast_last_member_interval;
1498 (timer_pending(&mp->timer) ?
1499 time_after(mp->timer.expires, time) :
1500 try_to_del_timer_sync(&mp->timer) >= 0)) {
1501 mod_timer(&mp->timer, time);
1507 for (p = mlock_dereference(mp->ports, br);
1509 p = mlock_dereference(p->next, br)) {
1510 if (p->port != port)
1513 if (!hlist_unhashed(&p->mglist) &&
1514 (timer_pending(&p->timer) ?
1515 time_after(p->timer.expires, time) :
1516 try_to_del_timer_sync(&p->timer) >= 0)) {
1517 mod_timer(&p->timer, time);
1523 spin_unlock(&br->multicast_lock);
1526 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1527 struct net_bridge_port *port,
1531 struct br_ip br_group;
1532 struct bridge_mcast_own_query *own_query;
1534 if (ipv4_is_local_multicast(group))
1537 own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1539 br_group.u.ip4 = group;
1540 br_group.proto = htons(ETH_P_IP);
1543 br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1547 #if IS_ENABLED(CONFIG_IPV6)
1548 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1549 struct net_bridge_port *port,
1550 const struct in6_addr *group,
1553 struct br_ip br_group;
1554 struct bridge_mcast_own_query *own_query;
1556 if (ipv6_addr_is_ll_all_nodes(group))
1559 own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1561 br_group.u.ip6 = *group;
1562 br_group.proto = htons(ETH_P_IPV6);
1565 br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1570 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1571 struct net_bridge_port *port,
1572 struct sk_buff *skb,
1575 struct sk_buff *skb_trimmed = NULL;
1579 err = ip_mc_check_igmp(skb, &skb_trimmed);
1581 if (err == -ENOMSG) {
1582 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
1583 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1585 } else if (err < 0) {
1589 BR_INPUT_SKB_CB(skb)->igmp = 1;
1593 case IGMP_HOST_MEMBERSHIP_REPORT:
1594 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1595 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1596 err = br_ip4_multicast_add_group(br, port, ih->group, vid);
1598 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1599 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1601 case IGMP_HOST_MEMBERSHIP_QUERY:
1602 err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
1604 case IGMP_HOST_LEAVE_MESSAGE:
1605 br_ip4_multicast_leave_group(br, port, ih->group, vid);
1609 if (skb_trimmed && skb_trimmed != skb)
1610 kfree_skb(skb_trimmed);
1615 #if IS_ENABLED(CONFIG_IPV6)
1616 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1617 struct net_bridge_port *port,
1618 struct sk_buff *skb,
1621 struct sk_buff *skb_trimmed = NULL;
1622 struct mld_msg *mld;
1625 err = ipv6_mc_check_mld(skb, &skb_trimmed);
1627 if (err == -ENOMSG) {
1628 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1629 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1631 } else if (err < 0) {
1635 BR_INPUT_SKB_CB(skb)->igmp = 1;
1636 mld = (struct mld_msg *)skb_transport_header(skb);
1638 switch (mld->mld_type) {
1639 case ICMPV6_MGM_REPORT:
1640 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1641 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
1643 case ICMPV6_MLD2_REPORT:
1644 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1646 case ICMPV6_MGM_QUERY:
1647 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1649 case ICMPV6_MGM_REDUCTION:
1650 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
1654 if (skb_trimmed && skb_trimmed != skb)
1655 kfree_skb(skb_trimmed);
1661 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1662 struct sk_buff *skb, u16 vid)
1664 BR_INPUT_SKB_CB(skb)->igmp = 0;
1665 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1667 if (br->multicast_disabled)
1670 switch (skb->protocol) {
1671 case htons(ETH_P_IP):
1672 return br_multicast_ipv4_rcv(br, port, skb, vid);
1673 #if IS_ENABLED(CONFIG_IPV6)
1674 case htons(ETH_P_IPV6):
1675 return br_multicast_ipv6_rcv(br, port, skb, vid);
1682 static void br_multicast_query_expired(struct net_bridge *br,
1683 struct bridge_mcast_own_query *query,
1684 struct bridge_mcast_querier *querier)
1686 spin_lock(&br->multicast_lock);
1687 if (query->startup_sent < br->multicast_startup_query_count)
1688 query->startup_sent++;
1690 RCU_INIT_POINTER(querier->port, NULL);
1691 br_multicast_send_query(br, NULL, query);
1692 spin_unlock(&br->multicast_lock);
1695 static void br_ip4_multicast_query_expired(unsigned long data)
1697 struct net_bridge *br = (void *)data;
1699 br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1702 #if IS_ENABLED(CONFIG_IPV6)
1703 static void br_ip6_multicast_query_expired(unsigned long data)
1705 struct net_bridge *br = (void *)data;
1707 br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1711 void br_multicast_init(struct net_bridge *br)
1713 br->hash_elasticity = 4;
1716 br->multicast_router = 1;
1717 br->multicast_querier = 0;
1718 br->multicast_query_use_ifaddr = 0;
1719 br->multicast_last_member_count = 2;
1720 br->multicast_startup_query_count = 2;
1722 br->multicast_last_member_interval = HZ;
1723 br->multicast_query_response_interval = 10 * HZ;
1724 br->multicast_startup_query_interval = 125 * HZ / 4;
1725 br->multicast_query_interval = 125 * HZ;
1726 br->multicast_querier_interval = 255 * HZ;
1727 br->multicast_membership_interval = 260 * HZ;
1729 br->ip4_other_query.delay_time = 0;
1730 br->ip4_querier.port = NULL;
1731 #if IS_ENABLED(CONFIG_IPV6)
1732 br->ip6_other_query.delay_time = 0;
1733 br->ip6_querier.port = NULL;
1736 spin_lock_init(&br->multicast_lock);
1737 setup_timer(&br->multicast_router_timer,
1738 br_multicast_local_router_expired, 0);
1739 setup_timer(&br->ip4_other_query.timer,
1740 br_ip4_multicast_querier_expired, (unsigned long)br);
1741 setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
1743 #if IS_ENABLED(CONFIG_IPV6)
1744 setup_timer(&br->ip6_other_query.timer,
1745 br_ip6_multicast_querier_expired, (unsigned long)br);
1746 setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
1751 static void __br_multicast_open(struct net_bridge *br,
1752 struct bridge_mcast_own_query *query)
1754 query->startup_sent = 0;
1756 if (br->multicast_disabled)
1759 mod_timer(&query->timer, jiffies);
1762 void br_multicast_open(struct net_bridge *br)
1764 __br_multicast_open(br, &br->ip4_own_query);
1765 #if IS_ENABLED(CONFIG_IPV6)
1766 __br_multicast_open(br, &br->ip6_own_query);
1770 void br_multicast_stop(struct net_bridge *br)
1772 del_timer_sync(&br->multicast_router_timer);
1773 del_timer_sync(&br->ip4_other_query.timer);
1774 del_timer_sync(&br->ip4_own_query.timer);
1775 #if IS_ENABLED(CONFIG_IPV6)
1776 del_timer_sync(&br->ip6_other_query.timer);
1777 del_timer_sync(&br->ip6_own_query.timer);
1781 void br_multicast_dev_del(struct net_bridge *br)
1783 struct net_bridge_mdb_htable *mdb;
1784 struct net_bridge_mdb_entry *mp;
1785 struct hlist_node *n;
1789 spin_lock_bh(&br->multicast_lock);
1790 mdb = mlock_dereference(br->mdb, br);
1797 for (i = 0; i < mdb->max; i++) {
1798 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
1800 del_timer(&mp->timer);
1801 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1806 spin_unlock_bh(&br->multicast_lock);
1808 spin_lock_bh(&br->multicast_lock);
1813 call_rcu_bh(&mdb->rcu, br_mdb_free);
1816 spin_unlock_bh(&br->multicast_lock);
1819 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1823 spin_lock_bh(&br->multicast_lock);
1828 del_timer(&br->multicast_router_timer);
1831 br->multicast_router = val;
1836 spin_unlock_bh(&br->multicast_lock);
1841 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1843 struct net_bridge *br = p->br;
1846 spin_lock(&br->multicast_lock);
1852 p->multicast_router = val;
1855 if (val < 2 && !hlist_unhashed(&p->rlist)) {
1856 hlist_del_init_rcu(&p->rlist);
1857 br_rtr_notify(br->dev, p, RTM_DELMDB);
1863 del_timer(&p->multicast_router_timer);
1868 br_multicast_add_router(br, p);
1872 spin_unlock(&br->multicast_lock);
1877 static void br_multicast_start_querier(struct net_bridge *br,
1878 struct bridge_mcast_own_query *query)
1880 struct net_bridge_port *port;
1882 __br_multicast_open(br, query);
1884 list_for_each_entry(port, &br->port_list, list) {
1885 if (port->state == BR_STATE_DISABLED ||
1886 port->state == BR_STATE_BLOCKING)
1889 if (query == &br->ip4_own_query)
1890 br_multicast_enable(&port->ip4_own_query);
1891 #if IS_ENABLED(CONFIG_IPV6)
1893 br_multicast_enable(&port->ip6_own_query);
1898 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1901 struct net_bridge_mdb_htable *mdb;
1903 spin_lock_bh(&br->multicast_lock);
1904 if (br->multicast_disabled == !val)
1907 br->multicast_disabled = !val;
1908 if (br->multicast_disabled)
1911 if (!netif_running(br->dev))
1914 mdb = mlock_dereference(br->mdb, br);
1919 br->multicast_disabled = !!val;
1923 err = br_mdb_rehash(&br->mdb, mdb->max,
1924 br->hash_elasticity);
1929 br_multicast_start_querier(br, &br->ip4_own_query);
1930 #if IS_ENABLED(CONFIG_IPV6)
1931 br_multicast_start_querier(br, &br->ip6_own_query);
1935 spin_unlock_bh(&br->multicast_lock);
1940 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
1942 unsigned long max_delay;
1946 spin_lock_bh(&br->multicast_lock);
1947 if (br->multicast_querier == val)
1950 br->multicast_querier = val;
1954 max_delay = br->multicast_query_response_interval;
1956 if (!timer_pending(&br->ip4_other_query.timer))
1957 br->ip4_other_query.delay_time = jiffies + max_delay;
1959 br_multicast_start_querier(br, &br->ip4_own_query);
1961 #if IS_ENABLED(CONFIG_IPV6)
1962 if (!timer_pending(&br->ip6_other_query.timer))
1963 br->ip6_other_query.delay_time = jiffies + max_delay;
1965 br_multicast_start_querier(br, &br->ip6_own_query);
1969 spin_unlock_bh(&br->multicast_lock);
1974 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1978 struct net_bridge_mdb_htable *mdb;
1980 spin_lock_bh(&br->multicast_lock);
1981 if (!is_power_of_2(val))
1984 mdb = mlock_dereference(br->mdb, br);
1985 if (mdb && val < mdb->size)
2001 err = br_mdb_rehash(&br->mdb, br->hash_max,
2002 br->hash_elasticity);
2008 spin_unlock_bh(&br->multicast_lock);
2014 * br_multicast_list_adjacent - Returns snooped multicast addresses
2015 * @dev: The bridge port adjacent to which to retrieve addresses
2016 * @br_ip_list: The list to store found, snooped multicast IP addresses in
2018 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2019 * snooping feature on all bridge ports of dev's bridge device, excluding
2020 * the addresses from dev itself.
2022 * Returns the number of items added to br_ip_list.
2025 * - br_ip_list needs to be initialized by caller
2026 * - br_ip_list might contain duplicates in the end
2027 * (needs to be taken care of by caller)
2028 * - br_ip_list needs to be freed by caller
2030 int br_multicast_list_adjacent(struct net_device *dev,
2031 struct list_head *br_ip_list)
2033 struct net_bridge *br;
2034 struct net_bridge_port *port;
2035 struct net_bridge_port_group *group;
2036 struct br_ip_list *entry;
2040 if (!br_ip_list || !br_port_exists(dev))
2043 port = br_port_get_rcu(dev);
2044 if (!port || !port->br)
2049 list_for_each_entry_rcu(port, &br->port_list, list) {
2050 if (!port->dev || port->dev == dev)
2053 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2054 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2058 entry->addr = group->addr;
2059 list_add(&entry->list, br_ip_list);
2068 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2071 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2072 * @dev: The bridge port providing the bridge on which to check for a querier
2073 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2075 * Checks whether the given interface has a bridge on top and if so returns
2076 * true if a valid querier exists anywhere on the bridged link layer.
2077 * Otherwise returns false.
2079 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2081 struct net_bridge *br;
2082 struct net_bridge_port *port;
2087 if (!br_port_exists(dev))
2090 port = br_port_get_rcu(dev);
2091 if (!port || !port->br)
2096 memset(ð, 0, sizeof(eth));
2097 eth.h_proto = htons(proto);
2099 ret = br_multicast_querier_exists(br, ð);
2105 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2108 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2109 * @dev: The bridge port adjacent to which to check for a querier
2110 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2112 * Checks whether the given interface has a bridge on top and if so returns
2113 * true if a selected querier is behind one of the other ports of this
2114 * bridge. Otherwise returns false.
2116 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2118 struct net_bridge *br;
2119 struct net_bridge_port *port;
2123 if (!br_port_exists(dev))
2126 port = br_port_get_rcu(dev);
2127 if (!port || !port->br)
2134 if (!timer_pending(&br->ip4_other_query.timer) ||
2135 rcu_dereference(br->ip4_querier.port) == port)
2138 #if IS_ENABLED(CONFIG_IPV6)
2140 if (!timer_pending(&br->ip6_other_query.timer) ||
2141 rcu_dereference(br->ip6_querier.port) == port)
2154 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);