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/if_ether.h>
15 #include <linux/igmp.h>
16 #include <linux/jhash.h>
17 #include <linux/kernel.h>
18 #include <linux/log2.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter_bridge.h>
21 #include <linux/random.h>
22 #include <linux/rculist.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
26 #include <linux/inetdevice.h>
28 #if IS_ENABLED(CONFIG_IPV6)
31 #include <net/ip6_checksum.h>
34 #include "br_private.h"
36 static void br_multicast_start_querier(struct net_bridge
*br
);
37 unsigned int br_mdb_rehash_seq
;
39 static inline int br_ip_equal(const struct br_ip
*a
, const struct br_ip
*b
)
41 if (a
->proto
!= b
->proto
)
47 return a
->u
.ip4
== b
->u
.ip4
;
48 #if IS_ENABLED(CONFIG_IPV6)
49 case htons(ETH_P_IPV6
):
50 return ipv6_addr_equal(&a
->u
.ip6
, &b
->u
.ip6
);
56 static inline int __br_ip4_hash(struct net_bridge_mdb_htable
*mdb
, __be32 ip
,
59 return jhash_2words((__force u32
)ip
, vid
, mdb
->secret
) & (mdb
->max
- 1);
62 #if IS_ENABLED(CONFIG_IPV6)
63 static inline int __br_ip6_hash(struct net_bridge_mdb_htable
*mdb
,
64 const struct in6_addr
*ip
,
67 return jhash_2words(ipv6_addr_hash(ip
), vid
,
68 mdb
->secret
) & (mdb
->max
- 1);
72 static inline int br_ip_hash(struct net_bridge_mdb_htable
*mdb
,
77 return __br_ip4_hash(mdb
, ip
->u
.ip4
, ip
->vid
);
78 #if IS_ENABLED(CONFIG_IPV6)
79 case htons(ETH_P_IPV6
):
80 return __br_ip6_hash(mdb
, &ip
->u
.ip6
, ip
->vid
);
86 static struct net_bridge_mdb_entry
*__br_mdb_ip_get(
87 struct net_bridge_mdb_htable
*mdb
, struct br_ip
*dst
, int hash
)
89 struct net_bridge_mdb_entry
*mp
;
91 hlist_for_each_entry_rcu(mp
, &mdb
->mhash
[hash
], hlist
[mdb
->ver
]) {
92 if (br_ip_equal(&mp
->addr
, dst
))
99 struct net_bridge_mdb_entry
*br_mdb_ip_get(struct net_bridge_mdb_htable
*mdb
,
105 return __br_mdb_ip_get(mdb
, dst
, br_ip_hash(mdb
, dst
));
108 static struct net_bridge_mdb_entry
*br_mdb_ip4_get(
109 struct net_bridge_mdb_htable
*mdb
, __be32 dst
, __u16 vid
)
114 br_dst
.proto
= htons(ETH_P_IP
);
117 return br_mdb_ip_get(mdb
, &br_dst
);
120 #if IS_ENABLED(CONFIG_IPV6)
121 static struct net_bridge_mdb_entry
*br_mdb_ip6_get(
122 struct net_bridge_mdb_htable
*mdb
, const struct in6_addr
*dst
,
128 br_dst
.proto
= htons(ETH_P_IPV6
);
131 return br_mdb_ip_get(mdb
, &br_dst
);
135 struct net_bridge_mdb_entry
*br_mdb_get(struct net_bridge
*br
,
136 struct sk_buff
*skb
, u16 vid
)
138 struct net_bridge_mdb_htable
*mdb
= rcu_dereference(br
->mdb
);
141 if (br
->multicast_disabled
)
144 if (BR_INPUT_SKB_CB(skb
)->igmp
)
147 ip
.proto
= skb
->protocol
;
150 switch (skb
->protocol
) {
151 case htons(ETH_P_IP
):
152 ip
.u
.ip4
= ip_hdr(skb
)->daddr
;
154 #if IS_ENABLED(CONFIG_IPV6)
155 case htons(ETH_P_IPV6
):
156 ip
.u
.ip6
= ipv6_hdr(skb
)->daddr
;
163 return br_mdb_ip_get(mdb
, &ip
);
166 static void br_mdb_free(struct rcu_head
*head
)
168 struct net_bridge_mdb_htable
*mdb
=
169 container_of(head
, struct net_bridge_mdb_htable
, rcu
);
170 struct net_bridge_mdb_htable
*old
= mdb
->old
;
177 static int br_mdb_copy(struct net_bridge_mdb_htable
*new,
178 struct net_bridge_mdb_htable
*old
,
181 struct net_bridge_mdb_entry
*mp
;
186 for (i
= 0; i
< old
->max
; i
++)
187 hlist_for_each_entry(mp
, &old
->mhash
[i
], hlist
[old
->ver
])
188 hlist_add_head(&mp
->hlist
[new->ver
],
189 &new->mhash
[br_ip_hash(new, &mp
->addr
)]);
195 for (i
= 0; i
< new->max
; i
++) {
197 hlist_for_each_entry(mp
, &new->mhash
[i
], hlist
[new->ver
])
203 return maxlen
> elasticity
? -EINVAL
: 0;
206 void br_multicast_free_pg(struct rcu_head
*head
)
208 struct net_bridge_port_group
*p
=
209 container_of(head
, struct net_bridge_port_group
, rcu
);
214 static void br_multicast_free_group(struct rcu_head
*head
)
216 struct net_bridge_mdb_entry
*mp
=
217 container_of(head
, struct net_bridge_mdb_entry
, rcu
);
222 static void br_multicast_group_expired(unsigned long data
)
224 struct net_bridge_mdb_entry
*mp
= (void *)data
;
225 struct net_bridge
*br
= mp
->br
;
226 struct net_bridge_mdb_htable
*mdb
;
228 spin_lock(&br
->multicast_lock
);
229 if (!netif_running(br
->dev
) || timer_pending(&mp
->timer
))
237 mdb
= mlock_dereference(br
->mdb
, br
);
239 hlist_del_rcu(&mp
->hlist
[mdb
->ver
]);
242 call_rcu_bh(&mp
->rcu
, br_multicast_free_group
);
245 spin_unlock(&br
->multicast_lock
);
248 static void br_multicast_del_pg(struct net_bridge
*br
,
249 struct net_bridge_port_group
*pg
)
251 struct net_bridge_mdb_htable
*mdb
;
252 struct net_bridge_mdb_entry
*mp
;
253 struct net_bridge_port_group
*p
;
254 struct net_bridge_port_group __rcu
**pp
;
256 mdb
= mlock_dereference(br
->mdb
, br
);
258 mp
= br_mdb_ip_get(mdb
, &pg
->addr
);
262 for (pp
= &mp
->ports
;
263 (p
= mlock_dereference(*pp
, br
)) != NULL
;
268 rcu_assign_pointer(*pp
, p
->next
);
269 hlist_del_init(&p
->mglist
);
270 del_timer(&p
->timer
);
271 call_rcu_bh(&p
->rcu
, br_multicast_free_pg
);
273 if (!mp
->ports
&& !mp
->mglist
&&
274 netif_running(br
->dev
))
275 mod_timer(&mp
->timer
, jiffies
);
283 static void br_multicast_port_group_expired(unsigned long data
)
285 struct net_bridge_port_group
*pg
= (void *)data
;
286 struct net_bridge
*br
= pg
->port
->br
;
288 spin_lock(&br
->multicast_lock
);
289 if (!netif_running(br
->dev
) || timer_pending(&pg
->timer
) ||
290 hlist_unhashed(&pg
->mglist
) || pg
->state
& MDB_PERMANENT
)
293 br_multicast_del_pg(br
, pg
);
296 spin_unlock(&br
->multicast_lock
);
299 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu
**mdbp
, int max
,
302 struct net_bridge_mdb_htable
*old
= rcu_dereference_protected(*mdbp
, 1);
303 struct net_bridge_mdb_htable
*mdb
;
306 mdb
= kmalloc(sizeof(*mdb
), GFP_ATOMIC
);
313 mdb
->mhash
= kzalloc(max
* sizeof(*mdb
->mhash
), GFP_ATOMIC
);
319 mdb
->size
= old
? old
->size
: 0;
320 mdb
->ver
= old
? old
->ver
^ 1 : 0;
322 if (!old
|| elasticity
)
323 get_random_bytes(&mdb
->secret
, sizeof(mdb
->secret
));
325 mdb
->secret
= old
->secret
;
330 err
= br_mdb_copy(mdb
, old
, elasticity
);
338 call_rcu_bh(&mdb
->rcu
, br_mdb_free
);
341 rcu_assign_pointer(*mdbp
, mdb
);
346 static struct sk_buff
*br_ip4_multicast_alloc_query(struct net_bridge
*br
,
354 skb
= netdev_alloc_skb_ip_align(br
->dev
, sizeof(*eth
) + sizeof(*iph
) +
359 skb
->protocol
= htons(ETH_P_IP
);
361 skb_reset_mac_header(skb
);
364 memcpy(eth
->h_source
, br
->dev
->dev_addr
, 6);
367 eth
->h_dest
[2] = 0x5e;
371 eth
->h_proto
= htons(ETH_P_IP
);
372 skb_put(skb
, sizeof(*eth
));
374 skb_set_network_header(skb
, skb
->len
);
380 iph
->tot_len
= htons(sizeof(*iph
) + sizeof(*ih
) + 4);
382 iph
->frag_off
= htons(IP_DF
);
384 iph
->protocol
= IPPROTO_IGMP
;
385 iph
->saddr
= br
->multicast_query_use_ifaddr
?
386 inet_select_addr(br
->dev
, 0, RT_SCOPE_LINK
) : 0;
387 iph
->daddr
= htonl(INADDR_ALLHOSTS_GROUP
);
388 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
389 ((u8
*)&iph
[1])[1] = 4;
390 ((u8
*)&iph
[1])[2] = 0;
391 ((u8
*)&iph
[1])[3] = 0;
395 skb_set_transport_header(skb
, skb
->len
);
397 ih
->type
= IGMP_HOST_MEMBERSHIP_QUERY
;
398 ih
->code
= (group
? br
->multicast_last_member_interval
:
399 br
->multicast_query_response_interval
) /
400 (HZ
/ IGMP_TIMER_SCALE
);
403 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
404 skb_put(skb
, sizeof(*ih
));
406 __skb_pull(skb
, sizeof(*eth
));
412 #if IS_ENABLED(CONFIG_IPV6)
413 static struct sk_buff
*br_ip6_multicast_alloc_query(struct net_bridge
*br
,
414 const struct in6_addr
*group
)
417 struct ipv6hdr
*ip6h
;
418 struct mld_msg
*mldq
;
421 unsigned long interval
;
423 skb
= netdev_alloc_skb_ip_align(br
->dev
, sizeof(*eth
) + sizeof(*ip6h
) +
428 skb
->protocol
= htons(ETH_P_IPV6
);
430 /* Ethernet header */
431 skb_reset_mac_header(skb
);
434 memcpy(eth
->h_source
, br
->dev
->dev_addr
, 6);
435 eth
->h_proto
= htons(ETH_P_IPV6
);
436 skb_put(skb
, sizeof(*eth
));
438 /* IPv6 header + HbH option */
439 skb_set_network_header(skb
, skb
->len
);
440 ip6h
= ipv6_hdr(skb
);
442 *(__force __be32
*)ip6h
= htonl(0x60000000);
443 ip6h
->payload_len
= htons(8 + sizeof(*mldq
));
444 ip6h
->nexthdr
= IPPROTO_HOPOPTS
;
446 ipv6_addr_set(&ip6h
->daddr
, htonl(0xff020000), 0, 0, htonl(1));
447 if (ipv6_dev_get_saddr(dev_net(br
->dev
), br
->dev
, &ip6h
->daddr
, 0,
452 ipv6_eth_mc_map(&ip6h
->daddr
, eth
->h_dest
);
454 hopopt
= (u8
*)(ip6h
+ 1);
455 hopopt
[0] = IPPROTO_ICMPV6
; /* next hdr */
456 hopopt
[1] = 0; /* length of HbH */
457 hopopt
[2] = IPV6_TLV_ROUTERALERT
; /* Router Alert */
458 hopopt
[3] = 2; /* Length of RA Option */
459 hopopt
[4] = 0; /* Type = 0x0000 (MLD) */
461 hopopt
[6] = IPV6_TLV_PAD1
; /* Pad1 */
462 hopopt
[7] = IPV6_TLV_PAD1
; /* Pad1 */
464 skb_put(skb
, sizeof(*ip6h
) + 8);
467 skb_set_transport_header(skb
, skb
->len
);
468 mldq
= (struct mld_msg
*) icmp6_hdr(skb
);
470 interval
= ipv6_addr_any(group
) ? br
->multicast_last_member_interval
:
471 br
->multicast_query_response_interval
;
473 mldq
->mld_type
= ICMPV6_MGM_QUERY
;
476 mldq
->mld_maxdelay
= htons((u16
)jiffies_to_msecs(interval
));
477 mldq
->mld_reserved
= 0;
478 mldq
->mld_mca
= *group
;
481 mldq
->mld_cksum
= csum_ipv6_magic(&ip6h
->saddr
, &ip6h
->daddr
,
482 sizeof(*mldq
), IPPROTO_ICMPV6
,
485 skb_put(skb
, sizeof(*mldq
));
487 __skb_pull(skb
, sizeof(*eth
));
494 static struct sk_buff
*br_multicast_alloc_query(struct net_bridge
*br
,
497 switch (addr
->proto
) {
498 case htons(ETH_P_IP
):
499 return br_ip4_multicast_alloc_query(br
, addr
->u
.ip4
);
500 #if IS_ENABLED(CONFIG_IPV6)
501 case htons(ETH_P_IPV6
):
502 return br_ip6_multicast_alloc_query(br
, &addr
->u
.ip6
);
508 static struct net_bridge_mdb_entry
*br_multicast_get_group(
509 struct net_bridge
*br
, struct net_bridge_port
*port
,
510 struct br_ip
*group
, int hash
)
512 struct net_bridge_mdb_htable
*mdb
;
513 struct net_bridge_mdb_entry
*mp
;
514 unsigned int count
= 0;
519 mdb
= rcu_dereference_protected(br
->mdb
, 1);
520 hlist_for_each_entry(mp
, &mdb
->mhash
[hash
], hlist
[mdb
->ver
]) {
522 if (unlikely(br_ip_equal(group
, &mp
->addr
)))
529 if (unlikely(count
> br
->hash_elasticity
&& count
)) {
531 br_info(br
, "Multicast hash table "
532 "chain limit reached: %s\n",
533 port
? port
->dev
->name
: br
->dev
->name
);
535 elasticity
= br
->hash_elasticity
;
538 if (mdb
->size
>= max
) {
540 if (unlikely(max
> br
->hash_max
)) {
541 br_warn(br
, "Multicast hash table maximum of %d "
542 "reached, disabling snooping: %s\n",
544 port
? port
->dev
->name
: br
->dev
->name
);
547 br
->multicast_disabled
= 1;
552 if (max
> mdb
->max
|| elasticity
) {
555 br_info(br
, "Multicast hash table "
557 port
? port
->dev
->name
: br
->dev
->name
);
562 err
= br_mdb_rehash(&br
->mdb
, max
, elasticity
);
564 br_warn(br
, "Cannot rehash multicast "
565 "hash table, disabling snooping: %s, %d, %d\n",
566 port
? port
->dev
->name
: br
->dev
->name
,
582 struct net_bridge_mdb_entry
*br_multicast_new_group(struct net_bridge
*br
,
583 struct net_bridge_port
*port
, struct br_ip
*group
)
585 struct net_bridge_mdb_htable
*mdb
;
586 struct net_bridge_mdb_entry
*mp
;
590 mdb
= rcu_dereference_protected(br
->mdb
, 1);
592 err
= br_mdb_rehash(&br
->mdb
, BR_HASH_SIZE
, 0);
598 hash
= br_ip_hash(mdb
, group
);
599 mp
= br_multicast_get_group(br
, port
, group
, hash
);
600 switch (PTR_ERR(mp
)) {
606 mdb
= rcu_dereference_protected(br
->mdb
, 1);
607 hash
= br_ip_hash(mdb
, group
);
614 mp
= kzalloc(sizeof(*mp
), GFP_ATOMIC
);
616 return ERR_PTR(-ENOMEM
);
621 hlist_add_head_rcu(&mp
->hlist
[mdb
->ver
], &mdb
->mhash
[hash
]);
628 struct net_bridge_port_group
*br_multicast_new_port_group(
629 struct net_bridge_port
*port
,
631 struct net_bridge_port_group __rcu
*next
,
634 struct net_bridge_port_group
*p
;
636 p
= kzalloc(sizeof(*p
), GFP_ATOMIC
);
643 rcu_assign_pointer(p
->next
, next
);
644 hlist_add_head(&p
->mglist
, &port
->mglist
);
645 setup_timer(&p
->timer
, br_multicast_port_group_expired
,
650 static int br_multicast_add_group(struct net_bridge
*br
,
651 struct net_bridge_port
*port
,
654 struct net_bridge_mdb_entry
*mp
;
655 struct net_bridge_port_group
*p
;
656 struct net_bridge_port_group __rcu
**pp
;
659 spin_lock(&br
->multicast_lock
);
660 if (!netif_running(br
->dev
) ||
661 (port
&& port
->state
== BR_STATE_DISABLED
))
664 mp
= br_multicast_new_group(br
, port
, group
);
674 for (pp
= &mp
->ports
;
675 (p
= mlock_dereference(*pp
, br
)) != NULL
;
679 if ((unsigned long)p
->port
< (unsigned long)port
)
683 p
= br_multicast_new_port_group(port
, group
, *pp
, MDB_TEMPORARY
);
686 rcu_assign_pointer(*pp
, p
);
687 br_mdb_notify(br
->dev
, port
, group
, RTM_NEWMDB
);
693 spin_unlock(&br
->multicast_lock
);
697 static int br_ip4_multicast_add_group(struct net_bridge
*br
,
698 struct net_bridge_port
*port
,
702 struct br_ip br_group
;
704 if (ipv4_is_local_multicast(group
))
707 br_group
.u
.ip4
= group
;
708 br_group
.proto
= htons(ETH_P_IP
);
711 return br_multicast_add_group(br
, port
, &br_group
);
714 #if IS_ENABLED(CONFIG_IPV6)
715 static int br_ip6_multicast_add_group(struct net_bridge
*br
,
716 struct net_bridge_port
*port
,
717 const struct in6_addr
*group
,
720 struct br_ip br_group
;
722 if (!ipv6_is_transient_multicast(group
))
725 br_group
.u
.ip6
= *group
;
726 br_group
.proto
= htons(ETH_P_IPV6
);
729 return br_multicast_add_group(br
, port
, &br_group
);
733 static void br_multicast_router_expired(unsigned long data
)
735 struct net_bridge_port
*port
= (void *)data
;
736 struct net_bridge
*br
= port
->br
;
738 spin_lock(&br
->multicast_lock
);
739 if (port
->multicast_router
!= 1 ||
740 timer_pending(&port
->multicast_router_timer
) ||
741 hlist_unhashed(&port
->rlist
))
744 hlist_del_init_rcu(&port
->rlist
);
747 spin_unlock(&br
->multicast_lock
);
750 static void br_multicast_local_router_expired(unsigned long data
)
754 static void br_multicast_querier_expired(unsigned long data
)
756 struct net_bridge
*br
= (void *)data
;
758 spin_lock(&br
->multicast_lock
);
759 if (!netif_running(br
->dev
) || br
->multicast_disabled
)
762 br_multicast_start_querier(br
);
765 spin_unlock(&br
->multicast_lock
);
768 static void __br_multicast_send_query(struct net_bridge
*br
,
769 struct net_bridge_port
*port
,
774 skb
= br_multicast_alloc_query(br
, ip
);
779 __skb_push(skb
, sizeof(struct ethhdr
));
780 skb
->dev
= port
->dev
;
781 NF_HOOK(NFPROTO_BRIDGE
, NF_BR_LOCAL_OUT
, skb
, NULL
, skb
->dev
,
787 static void br_multicast_send_query(struct net_bridge
*br
,
788 struct net_bridge_port
*port
, u32 sent
)
791 struct br_ip br_group
;
793 if (!netif_running(br
->dev
) || br
->multicast_disabled
||
794 !br
->multicast_querier
||
795 timer_pending(&br
->multicast_querier_timer
))
798 memset(&br_group
.u
, 0, sizeof(br_group
.u
));
800 br_group
.proto
= htons(ETH_P_IP
);
801 __br_multicast_send_query(br
, port
, &br_group
);
803 #if IS_ENABLED(CONFIG_IPV6)
804 br_group
.proto
= htons(ETH_P_IPV6
);
805 __br_multicast_send_query(br
, port
, &br_group
);
809 time
+= sent
< br
->multicast_startup_query_count
?
810 br
->multicast_startup_query_interval
:
811 br
->multicast_query_interval
;
812 mod_timer(port
? &port
->multicast_query_timer
:
813 &br
->multicast_query_timer
, time
);
816 static void br_multicast_port_query_expired(unsigned long data
)
818 struct net_bridge_port
*port
= (void *)data
;
819 struct net_bridge
*br
= port
->br
;
821 spin_lock(&br
->multicast_lock
);
822 if (port
->state
== BR_STATE_DISABLED
||
823 port
->state
== BR_STATE_BLOCKING
)
826 if (port
->multicast_startup_queries_sent
<
827 br
->multicast_startup_query_count
)
828 port
->multicast_startup_queries_sent
++;
830 br_multicast_send_query(port
->br
, port
,
831 port
->multicast_startup_queries_sent
);
834 spin_unlock(&br
->multicast_lock
);
837 void br_multicast_add_port(struct net_bridge_port
*port
)
839 port
->multicast_router
= 1;
841 setup_timer(&port
->multicast_router_timer
, br_multicast_router_expired
,
842 (unsigned long)port
);
843 setup_timer(&port
->multicast_query_timer
,
844 br_multicast_port_query_expired
, (unsigned long)port
);
847 void br_multicast_del_port(struct net_bridge_port
*port
)
849 del_timer_sync(&port
->multicast_router_timer
);
852 static void __br_multicast_enable_port(struct net_bridge_port
*port
)
854 port
->multicast_startup_queries_sent
= 0;
856 if (try_to_del_timer_sync(&port
->multicast_query_timer
) >= 0 ||
857 del_timer(&port
->multicast_query_timer
))
858 mod_timer(&port
->multicast_query_timer
, jiffies
);
861 void br_multicast_enable_port(struct net_bridge_port
*port
)
863 struct net_bridge
*br
= port
->br
;
865 spin_lock(&br
->multicast_lock
);
866 if (br
->multicast_disabled
|| !netif_running(br
->dev
))
869 __br_multicast_enable_port(port
);
872 spin_unlock(&br
->multicast_lock
);
875 void br_multicast_disable_port(struct net_bridge_port
*port
)
877 struct net_bridge
*br
= port
->br
;
878 struct net_bridge_port_group
*pg
;
879 struct hlist_node
*n
;
881 spin_lock(&br
->multicast_lock
);
882 hlist_for_each_entry_safe(pg
, n
, &port
->mglist
, mglist
)
883 br_multicast_del_pg(br
, pg
);
885 if (!hlist_unhashed(&port
->rlist
))
886 hlist_del_init_rcu(&port
->rlist
);
887 del_timer(&port
->multicast_router_timer
);
888 del_timer(&port
->multicast_query_timer
);
889 spin_unlock(&br
->multicast_lock
);
892 static int br_ip4_multicast_igmp3_report(struct net_bridge
*br
,
893 struct net_bridge_port
*port
,
896 struct igmpv3_report
*ih
;
897 struct igmpv3_grec
*grec
;
906 if (!pskb_may_pull(skb
, sizeof(*ih
)))
909 br_vlan_get_tag(skb
, &vid
);
910 ih
= igmpv3_report_hdr(skb
);
911 num
= ntohs(ih
->ngrec
);
914 for (i
= 0; i
< num
; i
++) {
915 len
+= sizeof(*grec
);
916 if (!pskb_may_pull(skb
, len
))
919 grec
= (void *)(skb
->data
+ len
- sizeof(*grec
));
920 group
= grec
->grec_mca
;
921 type
= grec
->grec_type
;
923 len
+= ntohs(grec
->grec_nsrcs
) * 4;
924 if (!pskb_may_pull(skb
, len
))
927 /* We treat this as an IGMPv2 report for now. */
929 case IGMPV3_MODE_IS_INCLUDE
:
930 case IGMPV3_MODE_IS_EXCLUDE
:
931 case IGMPV3_CHANGE_TO_INCLUDE
:
932 case IGMPV3_CHANGE_TO_EXCLUDE
:
933 case IGMPV3_ALLOW_NEW_SOURCES
:
934 case IGMPV3_BLOCK_OLD_SOURCES
:
941 err
= br_ip4_multicast_add_group(br
, port
, group
, vid
);
949 #if IS_ENABLED(CONFIG_IPV6)
950 static int br_ip6_multicast_mld2_report(struct net_bridge
*br
,
951 struct net_bridge_port
*port
,
954 struct icmp6hdr
*icmp6h
;
955 struct mld2_grec
*grec
;
962 if (!pskb_may_pull(skb
, sizeof(*icmp6h
)))
965 br_vlan_get_tag(skb
, &vid
);
966 icmp6h
= icmp6_hdr(skb
);
967 num
= ntohs(icmp6h
->icmp6_dataun
.un_data16
[1]);
968 len
= sizeof(*icmp6h
);
970 for (i
= 0; i
< num
; i
++) {
971 __be16
*nsrcs
, _nsrcs
;
973 nsrcs
= skb_header_pointer(skb
,
974 len
+ offsetof(struct mld2_grec
,
976 sizeof(_nsrcs
), &_nsrcs
);
980 if (!pskb_may_pull(skb
,
981 len
+ sizeof(*grec
) +
982 sizeof(struct in6_addr
) * ntohs(*nsrcs
)))
985 grec
= (struct mld2_grec
*)(skb
->data
+ len
);
986 len
+= sizeof(*grec
) +
987 sizeof(struct in6_addr
) * ntohs(*nsrcs
);
989 /* We treat these as MLDv1 reports for now. */
990 switch (grec
->grec_type
) {
991 case MLD2_MODE_IS_INCLUDE
:
992 case MLD2_MODE_IS_EXCLUDE
:
993 case MLD2_CHANGE_TO_INCLUDE
:
994 case MLD2_CHANGE_TO_EXCLUDE
:
995 case MLD2_ALLOW_NEW_SOURCES
:
996 case MLD2_BLOCK_OLD_SOURCES
:
1003 err
= br_ip6_multicast_add_group(br
, port
, &grec
->grec_mca
,
1014 * Add port to rotuer_list
1015 * list is maintained ordered by pointer value
1016 * and locked by br->multicast_lock and RCU
1018 static void br_multicast_add_router(struct net_bridge
*br
,
1019 struct net_bridge_port
*port
)
1021 struct net_bridge_port
*p
;
1022 struct hlist_node
*slot
= NULL
;
1024 hlist_for_each_entry(p
, &br
->router_list
, rlist
) {
1025 if ((unsigned long) port
>= (unsigned long) p
)
1031 hlist_add_after_rcu(slot
, &port
->rlist
);
1033 hlist_add_head_rcu(&port
->rlist
, &br
->router_list
);
1036 static void br_multicast_mark_router(struct net_bridge
*br
,
1037 struct net_bridge_port
*port
)
1039 unsigned long now
= jiffies
;
1042 if (br
->multicast_router
== 1)
1043 mod_timer(&br
->multicast_router_timer
,
1044 now
+ br
->multicast_querier_interval
);
1048 if (port
->multicast_router
!= 1)
1051 if (!hlist_unhashed(&port
->rlist
))
1054 br_multicast_add_router(br
, port
);
1057 mod_timer(&port
->multicast_router_timer
,
1058 now
+ br
->multicast_querier_interval
);
1061 static void br_multicast_query_received(struct net_bridge
*br
,
1062 struct net_bridge_port
*port
,
1066 mod_timer(&br
->multicast_querier_timer
,
1067 jiffies
+ br
->multicast_querier_interval
);
1068 else if (timer_pending(&br
->multicast_querier_timer
))
1071 br_multicast_mark_router(br
, port
);
1074 static int br_ip4_multicast_query(struct net_bridge
*br
,
1075 struct net_bridge_port
*port
,
1076 struct sk_buff
*skb
)
1078 const struct iphdr
*iph
= ip_hdr(skb
);
1079 struct igmphdr
*ih
= igmp_hdr(skb
);
1080 struct net_bridge_mdb_entry
*mp
;
1081 struct igmpv3_query
*ih3
;
1082 struct net_bridge_port_group
*p
;
1083 struct net_bridge_port_group __rcu
**pp
;
1084 unsigned long max_delay
;
1085 unsigned long now
= jiffies
;
1090 spin_lock(&br
->multicast_lock
);
1091 if (!netif_running(br
->dev
) ||
1092 (port
&& port
->state
== BR_STATE_DISABLED
))
1095 br_multicast_query_received(br
, port
, !!iph
->saddr
);
1099 if (skb
->len
== sizeof(*ih
)) {
1100 max_delay
= ih
->code
* (HZ
/ IGMP_TIMER_SCALE
);
1103 max_delay
= 10 * HZ
;
1107 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
))) {
1112 ih3
= igmpv3_query_hdr(skb
);
1116 max_delay
= ih3
->code
?
1117 IGMPV3_MRC(ih3
->code
) * (HZ
/ IGMP_TIMER_SCALE
) : 1;
1123 br_vlan_get_tag(skb
, &vid
);
1124 mp
= br_mdb_ip4_get(mlock_dereference(br
->mdb
, br
), group
, vid
);
1128 setup_timer(&mp
->timer
, br_multicast_group_expired
, (unsigned long)mp
);
1129 mod_timer(&mp
->timer
, now
+ br
->multicast_membership_interval
);
1130 mp
->timer_armed
= true;
1132 max_delay
*= br
->multicast_last_member_count
;
1135 (timer_pending(&mp
->timer
) ?
1136 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1137 try_to_del_timer_sync(&mp
->timer
) >= 0))
1138 mod_timer(&mp
->timer
, now
+ max_delay
);
1140 for (pp
= &mp
->ports
;
1141 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1143 if (timer_pending(&p
->timer
) ?
1144 time_after(p
->timer
.expires
, now
+ max_delay
) :
1145 try_to_del_timer_sync(&p
->timer
) >= 0)
1146 mod_timer(&p
->timer
, now
+ max_delay
);
1150 spin_unlock(&br
->multicast_lock
);
1154 #if IS_ENABLED(CONFIG_IPV6)
1155 static int br_ip6_multicast_query(struct net_bridge
*br
,
1156 struct net_bridge_port
*port
,
1157 struct sk_buff
*skb
)
1159 const struct ipv6hdr
*ip6h
= ipv6_hdr(skb
);
1160 struct mld_msg
*mld
;
1161 struct net_bridge_mdb_entry
*mp
;
1162 struct mld2_query
*mld2q
;
1163 struct net_bridge_port_group
*p
;
1164 struct net_bridge_port_group __rcu
**pp
;
1165 unsigned long max_delay
;
1166 unsigned long now
= jiffies
;
1167 const struct in6_addr
*group
= NULL
;
1171 spin_lock(&br
->multicast_lock
);
1172 if (!netif_running(br
->dev
) ||
1173 (port
&& port
->state
== BR_STATE_DISABLED
))
1176 br_multicast_query_received(br
, port
, !ipv6_addr_any(&ip6h
->saddr
));
1178 if (skb
->len
== sizeof(*mld
)) {
1179 if (!pskb_may_pull(skb
, sizeof(*mld
))) {
1183 mld
= (struct mld_msg
*) icmp6_hdr(skb
);
1184 max_delay
= msecs_to_jiffies(ntohs(mld
->mld_maxdelay
));
1186 group
= &mld
->mld_mca
;
1187 } else if (skb
->len
>= sizeof(*mld2q
)) {
1188 if (!pskb_may_pull(skb
, sizeof(*mld2q
))) {
1192 mld2q
= (struct mld2_query
*)icmp6_hdr(skb
);
1193 if (!mld2q
->mld2q_nsrcs
)
1194 group
= &mld2q
->mld2q_mca
;
1195 max_delay
= mld2q
->mld2q_mrc
? MLDV2_MRC(ntohs(mld2q
->mld2q_mrc
)) : 1;
1201 br_vlan_get_tag(skb
, &vid
);
1202 mp
= br_mdb_ip6_get(mlock_dereference(br
->mdb
, br
), group
, vid
);
1206 setup_timer(&mp
->timer
, br_multicast_group_expired
, (unsigned long)mp
);
1207 mod_timer(&mp
->timer
, now
+ br
->multicast_membership_interval
);
1208 mp
->timer_armed
= true;
1210 max_delay
*= br
->multicast_last_member_count
;
1212 (timer_pending(&mp
->timer
) ?
1213 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1214 try_to_del_timer_sync(&mp
->timer
) >= 0))
1215 mod_timer(&mp
->timer
, now
+ max_delay
);
1217 for (pp
= &mp
->ports
;
1218 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1220 if (timer_pending(&p
->timer
) ?
1221 time_after(p
->timer
.expires
, now
+ max_delay
) :
1222 try_to_del_timer_sync(&p
->timer
) >= 0)
1223 mod_timer(&p
->timer
, now
+ max_delay
);
1227 spin_unlock(&br
->multicast_lock
);
1232 static void br_multicast_leave_group(struct net_bridge
*br
,
1233 struct net_bridge_port
*port
,
1234 struct br_ip
*group
)
1236 struct net_bridge_mdb_htable
*mdb
;
1237 struct net_bridge_mdb_entry
*mp
;
1238 struct net_bridge_port_group
*p
;
1242 spin_lock(&br
->multicast_lock
);
1243 if (!netif_running(br
->dev
) ||
1244 (port
&& port
->state
== BR_STATE_DISABLED
) ||
1245 timer_pending(&br
->multicast_querier_timer
))
1248 mdb
= mlock_dereference(br
->mdb
, br
);
1249 mp
= br_mdb_ip_get(mdb
, group
);
1253 if (br
->multicast_querier
&&
1254 !timer_pending(&br
->multicast_querier_timer
)) {
1255 __br_multicast_send_query(br
, port
, &mp
->addr
);
1257 time
= jiffies
+ br
->multicast_last_member_count
*
1258 br
->multicast_last_member_interval
;
1259 mod_timer(port
? &port
->multicast_query_timer
:
1260 &br
->multicast_query_timer
, time
);
1262 for (p
= mlock_dereference(mp
->ports
, br
);
1264 p
= mlock_dereference(p
->next
, br
)) {
1265 if (p
->port
!= port
)
1268 if (!hlist_unhashed(&p
->mglist
) &&
1269 (timer_pending(&p
->timer
) ?
1270 time_after(p
->timer
.expires
, time
) :
1271 try_to_del_timer_sync(&p
->timer
) >= 0)) {
1272 mod_timer(&p
->timer
, time
);
1279 if (port
&& (port
->flags
& BR_MULTICAST_FAST_LEAVE
)) {
1280 struct net_bridge_port_group __rcu
**pp
;
1282 for (pp
= &mp
->ports
;
1283 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1285 if (p
->port
!= port
)
1288 rcu_assign_pointer(*pp
, p
->next
);
1289 hlist_del_init(&p
->mglist
);
1290 del_timer(&p
->timer
);
1291 call_rcu_bh(&p
->rcu
, br_multicast_free_pg
);
1292 br_mdb_notify(br
->dev
, port
, group
, RTM_DELMDB
);
1294 if (!mp
->ports
&& !mp
->mglist
&& mp
->timer_armed
&&
1295 netif_running(br
->dev
))
1296 mod_timer(&mp
->timer
, jiffies
);
1302 time
= now
+ br
->multicast_last_member_count
*
1303 br
->multicast_last_member_interval
;
1306 if (mp
->mglist
&& mp
->timer_armed
&&
1307 (timer_pending(&mp
->timer
) ?
1308 time_after(mp
->timer
.expires
, time
) :
1309 try_to_del_timer_sync(&mp
->timer
) >= 0)) {
1310 mod_timer(&mp
->timer
, time
);
1315 spin_unlock(&br
->multicast_lock
);
1318 static void br_ip4_multicast_leave_group(struct net_bridge
*br
,
1319 struct net_bridge_port
*port
,
1323 struct br_ip br_group
;
1325 if (ipv4_is_local_multicast(group
))
1328 br_group
.u
.ip4
= group
;
1329 br_group
.proto
= htons(ETH_P_IP
);
1332 br_multicast_leave_group(br
, port
, &br_group
);
1335 #if IS_ENABLED(CONFIG_IPV6)
1336 static void br_ip6_multicast_leave_group(struct net_bridge
*br
,
1337 struct net_bridge_port
*port
,
1338 const struct in6_addr
*group
,
1341 struct br_ip br_group
;
1343 if (!ipv6_is_transient_multicast(group
))
1346 br_group
.u
.ip6
= *group
;
1347 br_group
.proto
= htons(ETH_P_IPV6
);
1350 br_multicast_leave_group(br
, port
, &br_group
);
1354 static int br_multicast_ipv4_rcv(struct net_bridge
*br
,
1355 struct net_bridge_port
*port
,
1356 struct sk_buff
*skb
)
1358 struct sk_buff
*skb2
= skb
;
1359 const struct iphdr
*iph
;
1362 unsigned int offset
;
1366 /* We treat OOM as packet loss for now. */
1367 if (!pskb_may_pull(skb
, sizeof(*iph
)))
1372 if (iph
->ihl
< 5 || iph
->version
!= 4)
1375 if (!pskb_may_pull(skb
, ip_hdrlen(skb
)))
1380 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1383 if (iph
->protocol
!= IPPROTO_IGMP
) {
1384 if (!ipv4_is_local_multicast(iph
->daddr
))
1385 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1389 len
= ntohs(iph
->tot_len
);
1390 if (skb
->len
< len
|| len
< ip_hdrlen(skb
))
1393 if (skb
->len
> len
) {
1394 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1398 err
= pskb_trim_rcsum(skb2
, len
);
1403 len
-= ip_hdrlen(skb2
);
1404 offset
= skb_network_offset(skb2
) + ip_hdrlen(skb2
);
1405 __skb_pull(skb2
, offset
);
1406 skb_reset_transport_header(skb2
);
1409 if (!pskb_may_pull(skb2
, sizeof(*ih
)))
1412 switch (skb2
->ip_summed
) {
1413 case CHECKSUM_COMPLETE
:
1414 if (!csum_fold(skb2
->csum
))
1419 if (skb_checksum_complete(skb2
))
1425 br_vlan_get_tag(skb2
, &vid
);
1426 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1427 ih
= igmp_hdr(skb2
);
1430 case IGMP_HOST_MEMBERSHIP_REPORT
:
1431 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1432 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1433 err
= br_ip4_multicast_add_group(br
, port
, ih
->group
, vid
);
1435 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1436 err
= br_ip4_multicast_igmp3_report(br
, port
, skb2
);
1438 case IGMP_HOST_MEMBERSHIP_QUERY
:
1439 err
= br_ip4_multicast_query(br
, port
, skb2
);
1441 case IGMP_HOST_LEAVE_MESSAGE
:
1442 br_ip4_multicast_leave_group(br
, port
, ih
->group
, vid
);
1447 __skb_push(skb2
, offset
);
1454 #if IS_ENABLED(CONFIG_IPV6)
1455 static int br_multicast_ipv6_rcv(struct net_bridge
*br
,
1456 struct net_bridge_port
*port
,
1457 struct sk_buff
*skb
)
1459 struct sk_buff
*skb2
;
1460 const struct ipv6hdr
*ip6h
;
1469 if (!pskb_may_pull(skb
, sizeof(*ip6h
)))
1472 ip6h
= ipv6_hdr(skb
);
1475 * We're interested in MLD messages only.
1477 * - MLD has always Router Alert hop-by-hop option
1478 * - But we do not support jumbrograms.
1480 if (ip6h
->version
!= 6 ||
1481 ip6h
->nexthdr
!= IPPROTO_HOPOPTS
||
1482 ip6h
->payload_len
== 0)
1485 len
= ntohs(ip6h
->payload_len
) + sizeof(*ip6h
);
1489 nexthdr
= ip6h
->nexthdr
;
1490 offset
= ipv6_skip_exthdr(skb
, sizeof(*ip6h
), &nexthdr
, &frag_off
);
1492 if (offset
< 0 || nexthdr
!= IPPROTO_ICMPV6
)
1495 /* Okay, we found ICMPv6 header */
1496 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1501 if (!pskb_may_pull(skb2
, offset
+ sizeof(struct icmp6hdr
)))
1504 len
-= offset
- skb_network_offset(skb2
);
1506 __skb_pull(skb2
, offset
);
1507 skb_reset_transport_header(skb2
);
1508 skb_postpull_rcsum(skb2
, skb_network_header(skb2
),
1509 skb_network_header_len(skb2
));
1511 icmp6_type
= icmp6_hdr(skb2
)->icmp6_type
;
1513 switch (icmp6_type
) {
1514 case ICMPV6_MGM_QUERY
:
1515 case ICMPV6_MGM_REPORT
:
1516 case ICMPV6_MGM_REDUCTION
:
1517 case ICMPV6_MLD2_REPORT
:
1524 /* Okay, we found MLD message. Check further. */
1525 if (skb2
->len
> len
) {
1526 err
= pskb_trim_rcsum(skb2
, len
);
1532 ip6h
= ipv6_hdr(skb2
);
1534 switch (skb2
->ip_summed
) {
1535 case CHECKSUM_COMPLETE
:
1536 if (!csum_ipv6_magic(&ip6h
->saddr
, &ip6h
->daddr
, skb2
->len
,
1537 IPPROTO_ICMPV6
, skb2
->csum
))
1541 skb2
->csum
= ~csum_unfold(csum_ipv6_magic(&ip6h
->saddr
,
1544 IPPROTO_ICMPV6
, 0));
1545 if (__skb_checksum_complete(skb2
))
1551 br_vlan_get_tag(skb
, &vid
);
1552 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1554 switch (icmp6_type
) {
1555 case ICMPV6_MGM_REPORT
:
1557 struct mld_msg
*mld
;
1558 if (!pskb_may_pull(skb2
, sizeof(*mld
))) {
1562 mld
= (struct mld_msg
*)skb_transport_header(skb2
);
1563 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1564 err
= br_ip6_multicast_add_group(br
, port
, &mld
->mld_mca
, vid
);
1567 case ICMPV6_MLD2_REPORT
:
1568 err
= br_ip6_multicast_mld2_report(br
, port
, skb2
);
1570 case ICMPV6_MGM_QUERY
:
1571 err
= br_ip6_multicast_query(br
, port
, skb2
);
1573 case ICMPV6_MGM_REDUCTION
:
1575 struct mld_msg
*mld
;
1576 if (!pskb_may_pull(skb2
, sizeof(*mld
))) {
1580 mld
= (struct mld_msg
*)skb_transport_header(skb2
);
1581 br_ip6_multicast_leave_group(br
, port
, &mld
->mld_mca
, vid
);
1591 int br_multicast_rcv(struct net_bridge
*br
, struct net_bridge_port
*port
,
1592 struct sk_buff
*skb
)
1594 BR_INPUT_SKB_CB(skb
)->igmp
= 0;
1595 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 0;
1597 if (br
->multicast_disabled
)
1600 switch (skb
->protocol
) {
1601 case htons(ETH_P_IP
):
1602 return br_multicast_ipv4_rcv(br
, port
, skb
);
1603 #if IS_ENABLED(CONFIG_IPV6)
1604 case htons(ETH_P_IPV6
):
1605 return br_multicast_ipv6_rcv(br
, port
, skb
);
1612 static void br_multicast_query_expired(unsigned long data
)
1614 struct net_bridge
*br
= (void *)data
;
1616 spin_lock(&br
->multicast_lock
);
1617 if (br
->multicast_startup_queries_sent
<
1618 br
->multicast_startup_query_count
)
1619 br
->multicast_startup_queries_sent
++;
1621 br_multicast_send_query(br
, NULL
, br
->multicast_startup_queries_sent
);
1623 spin_unlock(&br
->multicast_lock
);
1626 void br_multicast_init(struct net_bridge
*br
)
1628 br
->hash_elasticity
= 4;
1631 br
->multicast_router
= 1;
1632 br
->multicast_querier
= 0;
1633 br
->multicast_query_use_ifaddr
= 0;
1634 br
->multicast_last_member_count
= 2;
1635 br
->multicast_startup_query_count
= 2;
1637 br
->multicast_last_member_interval
= HZ
;
1638 br
->multicast_query_response_interval
= 10 * HZ
;
1639 br
->multicast_startup_query_interval
= 125 * HZ
/ 4;
1640 br
->multicast_query_interval
= 125 * HZ
;
1641 br
->multicast_querier_interval
= 255 * HZ
;
1642 br
->multicast_membership_interval
= 260 * HZ
;
1644 spin_lock_init(&br
->multicast_lock
);
1645 setup_timer(&br
->multicast_router_timer
,
1646 br_multicast_local_router_expired
, 0);
1647 setup_timer(&br
->multicast_querier_timer
,
1648 br_multicast_querier_expired
, (unsigned long)br
);
1649 setup_timer(&br
->multicast_query_timer
, br_multicast_query_expired
,
1653 void br_multicast_open(struct net_bridge
*br
)
1655 br
->multicast_startup_queries_sent
= 0;
1657 if (br
->multicast_disabled
)
1660 mod_timer(&br
->multicast_query_timer
, jiffies
);
1663 void br_multicast_stop(struct net_bridge
*br
)
1665 struct net_bridge_mdb_htable
*mdb
;
1666 struct net_bridge_mdb_entry
*mp
;
1667 struct hlist_node
*n
;
1671 del_timer_sync(&br
->multicast_router_timer
);
1672 del_timer_sync(&br
->multicast_querier_timer
);
1673 del_timer_sync(&br
->multicast_query_timer
);
1675 spin_lock_bh(&br
->multicast_lock
);
1676 mdb
= mlock_dereference(br
->mdb
, br
);
1683 for (i
= 0; i
< mdb
->max
; i
++) {
1684 hlist_for_each_entry_safe(mp
, n
, &mdb
->mhash
[i
],
1686 del_timer(&mp
->timer
);
1687 mp
->timer_armed
= false;
1688 call_rcu_bh(&mp
->rcu
, br_multicast_free_group
);
1693 spin_unlock_bh(&br
->multicast_lock
);
1695 spin_lock_bh(&br
->multicast_lock
);
1700 call_rcu_bh(&mdb
->rcu
, br_mdb_free
);
1703 spin_unlock_bh(&br
->multicast_lock
);
1706 int br_multicast_set_router(struct net_bridge
*br
, unsigned long val
)
1710 spin_lock_bh(&br
->multicast_lock
);
1711 if (!netif_running(br
->dev
))
1717 del_timer(&br
->multicast_router_timer
);
1720 br
->multicast_router
= val
;
1730 spin_unlock_bh(&br
->multicast_lock
);
1735 int br_multicast_set_port_router(struct net_bridge_port
*p
, unsigned long val
)
1737 struct net_bridge
*br
= p
->br
;
1740 spin_lock(&br
->multicast_lock
);
1741 if (!netif_running(br
->dev
) || p
->state
== BR_STATE_DISABLED
)
1748 p
->multicast_router
= val
;
1751 if (val
< 2 && !hlist_unhashed(&p
->rlist
))
1752 hlist_del_init_rcu(&p
->rlist
);
1757 del_timer(&p
->multicast_router_timer
);
1762 br_multicast_add_router(br
, p
);
1771 spin_unlock(&br
->multicast_lock
);
1776 static void br_multicast_start_querier(struct net_bridge
*br
)
1778 struct net_bridge_port
*port
;
1780 br_multicast_open(br
);
1782 list_for_each_entry(port
, &br
->port_list
, list
) {
1783 if (port
->state
== BR_STATE_DISABLED
||
1784 port
->state
== BR_STATE_BLOCKING
)
1787 __br_multicast_enable_port(port
);
1791 int br_multicast_toggle(struct net_bridge
*br
, unsigned long val
)
1794 struct net_bridge_mdb_htable
*mdb
;
1796 spin_lock_bh(&br
->multicast_lock
);
1797 if (br
->multicast_disabled
== !val
)
1800 br
->multicast_disabled
= !val
;
1801 if (br
->multicast_disabled
)
1804 if (!netif_running(br
->dev
))
1807 mdb
= mlock_dereference(br
->mdb
, br
);
1812 br
->multicast_disabled
= !!val
;
1816 err
= br_mdb_rehash(&br
->mdb
, mdb
->max
,
1817 br
->hash_elasticity
);
1822 br_multicast_start_querier(br
);
1825 spin_unlock_bh(&br
->multicast_lock
);
1830 int br_multicast_set_querier(struct net_bridge
*br
, unsigned long val
)
1834 spin_lock_bh(&br
->multicast_lock
);
1835 if (br
->multicast_querier
== val
)
1838 br
->multicast_querier
= val
;
1840 br_multicast_start_querier(br
);
1843 spin_unlock_bh(&br
->multicast_lock
);
1848 int br_multicast_set_hash_max(struct net_bridge
*br
, unsigned long val
)
1852 struct net_bridge_mdb_htable
*mdb
;
1854 spin_lock(&br
->multicast_lock
);
1855 if (!netif_running(br
->dev
))
1859 if (!is_power_of_2(val
))
1862 mdb
= mlock_dereference(br
->mdb
, br
);
1863 if (mdb
&& val
< mdb
->size
)
1879 err
= br_mdb_rehash(&br
->mdb
, br
->hash_max
,
1880 br
->hash_elasticity
);
1886 spin_unlock(&br
->multicast_lock
);