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
&& mp
->timer_armed
&&
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
) ?
471 br
->multicast_query_response_interval
:
472 br
->multicast_last_member_interval
;
474 mldq
->mld_type
= ICMPV6_MGM_QUERY
;
477 mldq
->mld_maxdelay
= htons((u16
)jiffies_to_msecs(interval
));
478 mldq
->mld_reserved
= 0;
479 mldq
->mld_mca
= *group
;
482 mldq
->mld_cksum
= csum_ipv6_magic(&ip6h
->saddr
, &ip6h
->daddr
,
483 sizeof(*mldq
), IPPROTO_ICMPV6
,
486 skb_put(skb
, sizeof(*mldq
));
488 __skb_pull(skb
, sizeof(*eth
));
495 static struct sk_buff
*br_multicast_alloc_query(struct net_bridge
*br
,
498 switch (addr
->proto
) {
499 case htons(ETH_P_IP
):
500 return br_ip4_multicast_alloc_query(br
, addr
->u
.ip4
);
501 #if IS_ENABLED(CONFIG_IPV6)
502 case htons(ETH_P_IPV6
):
503 return br_ip6_multicast_alloc_query(br
, &addr
->u
.ip6
);
509 static struct net_bridge_mdb_entry
*br_multicast_get_group(
510 struct net_bridge
*br
, struct net_bridge_port
*port
,
511 struct br_ip
*group
, int hash
)
513 struct net_bridge_mdb_htable
*mdb
;
514 struct net_bridge_mdb_entry
*mp
;
515 unsigned int count
= 0;
520 mdb
= rcu_dereference_protected(br
->mdb
, 1);
521 hlist_for_each_entry(mp
, &mdb
->mhash
[hash
], hlist
[mdb
->ver
]) {
523 if (unlikely(br_ip_equal(group
, &mp
->addr
)))
530 if (unlikely(count
> br
->hash_elasticity
&& count
)) {
532 br_info(br
, "Multicast hash table "
533 "chain limit reached: %s\n",
534 port
? port
->dev
->name
: br
->dev
->name
);
536 elasticity
= br
->hash_elasticity
;
539 if (mdb
->size
>= max
) {
541 if (unlikely(max
> br
->hash_max
)) {
542 br_warn(br
, "Multicast hash table maximum of %d "
543 "reached, disabling snooping: %s\n",
545 port
? port
->dev
->name
: br
->dev
->name
);
548 br
->multicast_disabled
= 1;
553 if (max
> mdb
->max
|| elasticity
) {
556 br_info(br
, "Multicast hash table "
558 port
? port
->dev
->name
: br
->dev
->name
);
563 err
= br_mdb_rehash(&br
->mdb
, max
, elasticity
);
565 br_warn(br
, "Cannot rehash multicast "
566 "hash table, disabling snooping: %s, %d, %d\n",
567 port
? port
->dev
->name
: br
->dev
->name
,
583 struct net_bridge_mdb_entry
*br_multicast_new_group(struct net_bridge
*br
,
584 struct net_bridge_port
*port
, struct br_ip
*group
)
586 struct net_bridge_mdb_htable
*mdb
;
587 struct net_bridge_mdb_entry
*mp
;
591 mdb
= rcu_dereference_protected(br
->mdb
, 1);
593 err
= br_mdb_rehash(&br
->mdb
, BR_HASH_SIZE
, 0);
599 hash
= br_ip_hash(mdb
, group
);
600 mp
= br_multicast_get_group(br
, port
, group
, hash
);
601 switch (PTR_ERR(mp
)) {
607 mdb
= rcu_dereference_protected(br
->mdb
, 1);
608 hash
= br_ip_hash(mdb
, group
);
615 mp
= kzalloc(sizeof(*mp
), GFP_ATOMIC
);
617 return ERR_PTR(-ENOMEM
);
622 setup_timer(&mp
->timer
, br_multicast_group_expired
,
625 hlist_add_head_rcu(&mp
->hlist
[mdb
->ver
], &mdb
->mhash
[hash
]);
632 struct net_bridge_port_group
*br_multicast_new_port_group(
633 struct net_bridge_port
*port
,
635 struct net_bridge_port_group __rcu
*next
,
638 struct net_bridge_port_group
*p
;
640 p
= kzalloc(sizeof(*p
), GFP_ATOMIC
);
647 rcu_assign_pointer(p
->next
, next
);
648 hlist_add_head(&p
->mglist
, &port
->mglist
);
649 setup_timer(&p
->timer
, br_multicast_port_group_expired
,
654 static int br_multicast_add_group(struct net_bridge
*br
,
655 struct net_bridge_port
*port
,
658 struct net_bridge_mdb_entry
*mp
;
659 struct net_bridge_port_group
*p
;
660 struct net_bridge_port_group __rcu
**pp
;
663 spin_lock(&br
->multicast_lock
);
664 if (!netif_running(br
->dev
) ||
665 (port
&& port
->state
== BR_STATE_DISABLED
))
668 mp
= br_multicast_new_group(br
, port
, group
);
678 for (pp
= &mp
->ports
;
679 (p
= mlock_dereference(*pp
, br
)) != NULL
;
683 if ((unsigned long)p
->port
< (unsigned long)port
)
687 p
= br_multicast_new_port_group(port
, group
, *pp
, MDB_TEMPORARY
);
690 rcu_assign_pointer(*pp
, p
);
691 br_mdb_notify(br
->dev
, port
, group
, RTM_NEWMDB
);
697 spin_unlock(&br
->multicast_lock
);
701 static int br_ip4_multicast_add_group(struct net_bridge
*br
,
702 struct net_bridge_port
*port
,
706 struct br_ip br_group
;
708 if (ipv4_is_local_multicast(group
))
711 br_group
.u
.ip4
= group
;
712 br_group
.proto
= htons(ETH_P_IP
);
715 return br_multicast_add_group(br
, port
, &br_group
);
718 #if IS_ENABLED(CONFIG_IPV6)
719 static int br_ip6_multicast_add_group(struct net_bridge
*br
,
720 struct net_bridge_port
*port
,
721 const struct in6_addr
*group
,
724 struct br_ip br_group
;
726 if (!ipv6_is_transient_multicast(group
))
729 br_group
.u
.ip6
= *group
;
730 br_group
.proto
= htons(ETH_P_IPV6
);
733 return br_multicast_add_group(br
, port
, &br_group
);
737 static void br_multicast_router_expired(unsigned long data
)
739 struct net_bridge_port
*port
= (void *)data
;
740 struct net_bridge
*br
= port
->br
;
742 spin_lock(&br
->multicast_lock
);
743 if (port
->multicast_router
!= 1 ||
744 timer_pending(&port
->multicast_router_timer
) ||
745 hlist_unhashed(&port
->rlist
))
748 hlist_del_init_rcu(&port
->rlist
);
751 spin_unlock(&br
->multicast_lock
);
754 static void br_multicast_local_router_expired(unsigned long data
)
758 static void br_multicast_querier_expired(unsigned long data
)
760 struct net_bridge
*br
= (void *)data
;
762 spin_lock(&br
->multicast_lock
);
763 if (!netif_running(br
->dev
) || br
->multicast_disabled
)
766 br_multicast_start_querier(br
);
769 spin_unlock(&br
->multicast_lock
);
772 static void __br_multicast_send_query(struct net_bridge
*br
,
773 struct net_bridge_port
*port
,
778 skb
= br_multicast_alloc_query(br
, ip
);
783 __skb_push(skb
, sizeof(struct ethhdr
));
784 skb
->dev
= port
->dev
;
785 NF_HOOK(NFPROTO_BRIDGE
, NF_BR_LOCAL_OUT
, skb
, NULL
, skb
->dev
,
791 static void br_multicast_send_query(struct net_bridge
*br
,
792 struct net_bridge_port
*port
, u32 sent
)
795 struct br_ip br_group
;
797 if (!netif_running(br
->dev
) || br
->multicast_disabled
||
798 !br
->multicast_querier
||
799 timer_pending(&br
->multicast_querier_timer
))
802 memset(&br_group
.u
, 0, sizeof(br_group
.u
));
804 br_group
.proto
= htons(ETH_P_IP
);
805 __br_multicast_send_query(br
, port
, &br_group
);
807 #if IS_ENABLED(CONFIG_IPV6)
808 br_group
.proto
= htons(ETH_P_IPV6
);
809 __br_multicast_send_query(br
, port
, &br_group
);
813 time
+= sent
< br
->multicast_startup_query_count
?
814 br
->multicast_startup_query_interval
:
815 br
->multicast_query_interval
;
816 mod_timer(port
? &port
->multicast_query_timer
:
817 &br
->multicast_query_timer
, time
);
820 static void br_multicast_port_query_expired(unsigned long data
)
822 struct net_bridge_port
*port
= (void *)data
;
823 struct net_bridge
*br
= port
->br
;
825 spin_lock(&br
->multicast_lock
);
826 if (port
->state
== BR_STATE_DISABLED
||
827 port
->state
== BR_STATE_BLOCKING
)
830 if (port
->multicast_startup_queries_sent
<
831 br
->multicast_startup_query_count
)
832 port
->multicast_startup_queries_sent
++;
834 br_multicast_send_query(port
->br
, port
,
835 port
->multicast_startup_queries_sent
);
838 spin_unlock(&br
->multicast_lock
);
841 void br_multicast_add_port(struct net_bridge_port
*port
)
843 port
->multicast_router
= 1;
845 setup_timer(&port
->multicast_router_timer
, br_multicast_router_expired
,
846 (unsigned long)port
);
847 setup_timer(&port
->multicast_query_timer
,
848 br_multicast_port_query_expired
, (unsigned long)port
);
851 void br_multicast_del_port(struct net_bridge_port
*port
)
853 del_timer_sync(&port
->multicast_router_timer
);
856 static void __br_multicast_enable_port(struct net_bridge_port
*port
)
858 port
->multicast_startup_queries_sent
= 0;
860 if (try_to_del_timer_sync(&port
->multicast_query_timer
) >= 0 ||
861 del_timer(&port
->multicast_query_timer
))
862 mod_timer(&port
->multicast_query_timer
, jiffies
);
865 void br_multicast_enable_port(struct net_bridge_port
*port
)
867 struct net_bridge
*br
= port
->br
;
869 spin_lock(&br
->multicast_lock
);
870 if (br
->multicast_disabled
|| !netif_running(br
->dev
))
873 __br_multicast_enable_port(port
);
876 spin_unlock(&br
->multicast_lock
);
879 void br_multicast_disable_port(struct net_bridge_port
*port
)
881 struct net_bridge
*br
= port
->br
;
882 struct net_bridge_port_group
*pg
;
883 struct hlist_node
*n
;
885 spin_lock(&br
->multicast_lock
);
886 hlist_for_each_entry_safe(pg
, n
, &port
->mglist
, mglist
)
887 br_multicast_del_pg(br
, pg
);
889 if (!hlist_unhashed(&port
->rlist
))
890 hlist_del_init_rcu(&port
->rlist
);
891 del_timer(&port
->multicast_router_timer
);
892 del_timer(&port
->multicast_query_timer
);
893 spin_unlock(&br
->multicast_lock
);
896 static int br_ip4_multicast_igmp3_report(struct net_bridge
*br
,
897 struct net_bridge_port
*port
,
900 struct igmpv3_report
*ih
;
901 struct igmpv3_grec
*grec
;
910 if (!pskb_may_pull(skb
, sizeof(*ih
)))
913 br_vlan_get_tag(skb
, &vid
);
914 ih
= igmpv3_report_hdr(skb
);
915 num
= ntohs(ih
->ngrec
);
918 for (i
= 0; i
< num
; i
++) {
919 len
+= sizeof(*grec
);
920 if (!pskb_may_pull(skb
, len
))
923 grec
= (void *)(skb
->data
+ len
- sizeof(*grec
));
924 group
= grec
->grec_mca
;
925 type
= grec
->grec_type
;
927 len
+= ntohs(grec
->grec_nsrcs
) * 4;
928 if (!pskb_may_pull(skb
, len
))
931 /* We treat this as an IGMPv2 report for now. */
933 case IGMPV3_MODE_IS_INCLUDE
:
934 case IGMPV3_MODE_IS_EXCLUDE
:
935 case IGMPV3_CHANGE_TO_INCLUDE
:
936 case IGMPV3_CHANGE_TO_EXCLUDE
:
937 case IGMPV3_ALLOW_NEW_SOURCES
:
938 case IGMPV3_BLOCK_OLD_SOURCES
:
945 err
= br_ip4_multicast_add_group(br
, port
, group
, vid
);
953 #if IS_ENABLED(CONFIG_IPV6)
954 static int br_ip6_multicast_mld2_report(struct net_bridge
*br
,
955 struct net_bridge_port
*port
,
958 struct icmp6hdr
*icmp6h
;
959 struct mld2_grec
*grec
;
966 if (!pskb_may_pull(skb
, sizeof(*icmp6h
)))
969 br_vlan_get_tag(skb
, &vid
);
970 icmp6h
= icmp6_hdr(skb
);
971 num
= ntohs(icmp6h
->icmp6_dataun
.un_data16
[1]);
972 len
= sizeof(*icmp6h
);
974 for (i
= 0; i
< num
; i
++) {
975 __be16
*nsrcs
, _nsrcs
;
977 nsrcs
= skb_header_pointer(skb
,
978 len
+ offsetof(struct mld2_grec
,
980 sizeof(_nsrcs
), &_nsrcs
);
984 if (!pskb_may_pull(skb
,
985 len
+ sizeof(*grec
) +
986 sizeof(struct in6_addr
) * ntohs(*nsrcs
)))
989 grec
= (struct mld2_grec
*)(skb
->data
+ len
);
990 len
+= sizeof(*grec
) +
991 sizeof(struct in6_addr
) * ntohs(*nsrcs
);
993 /* We treat these as MLDv1 reports for now. */
994 switch (grec
->grec_type
) {
995 case MLD2_MODE_IS_INCLUDE
:
996 case MLD2_MODE_IS_EXCLUDE
:
997 case MLD2_CHANGE_TO_INCLUDE
:
998 case MLD2_CHANGE_TO_EXCLUDE
:
999 case MLD2_ALLOW_NEW_SOURCES
:
1000 case MLD2_BLOCK_OLD_SOURCES
:
1007 err
= br_ip6_multicast_add_group(br
, port
, &grec
->grec_mca
,
1017 static void br_multicast_update_querier_timer(struct net_bridge
*br
,
1018 unsigned long max_delay
)
1020 if (!timer_pending(&br
->multicast_querier_timer
))
1021 br
->multicast_querier_delay_time
= jiffies
+ max_delay
;
1023 mod_timer(&br
->multicast_querier_timer
,
1024 jiffies
+ br
->multicast_querier_interval
);
1028 * Add port to router_list
1029 * list is maintained ordered by pointer value
1030 * and locked by br->multicast_lock and RCU
1032 static void br_multicast_add_router(struct net_bridge
*br
,
1033 struct net_bridge_port
*port
)
1035 struct net_bridge_port
*p
;
1036 struct hlist_node
*slot
= NULL
;
1038 hlist_for_each_entry(p
, &br
->router_list
, rlist
) {
1039 if ((unsigned long) port
>= (unsigned long) p
)
1045 hlist_add_after_rcu(slot
, &port
->rlist
);
1047 hlist_add_head_rcu(&port
->rlist
, &br
->router_list
);
1050 static void br_multicast_mark_router(struct net_bridge
*br
,
1051 struct net_bridge_port
*port
)
1053 unsigned long now
= jiffies
;
1056 if (br
->multicast_router
== 1)
1057 mod_timer(&br
->multicast_router_timer
,
1058 now
+ br
->multicast_querier_interval
);
1062 if (port
->multicast_router
!= 1)
1065 if (!hlist_unhashed(&port
->rlist
))
1068 br_multicast_add_router(br
, port
);
1071 mod_timer(&port
->multicast_router_timer
,
1072 now
+ br
->multicast_querier_interval
);
1075 static void br_multicast_query_received(struct net_bridge
*br
,
1076 struct net_bridge_port
*port
,
1078 unsigned long max_delay
)
1081 br_multicast_update_querier_timer(br
, max_delay
);
1082 else if (timer_pending(&br
->multicast_querier_timer
))
1085 br_multicast_mark_router(br
, port
);
1088 static int br_ip4_multicast_query(struct net_bridge
*br
,
1089 struct net_bridge_port
*port
,
1090 struct sk_buff
*skb
)
1092 const struct iphdr
*iph
= ip_hdr(skb
);
1093 struct igmphdr
*ih
= igmp_hdr(skb
);
1094 struct net_bridge_mdb_entry
*mp
;
1095 struct igmpv3_query
*ih3
;
1096 struct net_bridge_port_group
*p
;
1097 struct net_bridge_port_group __rcu
**pp
;
1098 unsigned long max_delay
;
1099 unsigned long now
= jiffies
;
1104 spin_lock(&br
->multicast_lock
);
1105 if (!netif_running(br
->dev
) ||
1106 (port
&& port
->state
== BR_STATE_DISABLED
))
1111 if (skb
->len
== sizeof(*ih
)) {
1112 max_delay
= ih
->code
* (HZ
/ IGMP_TIMER_SCALE
);
1115 max_delay
= 10 * HZ
;
1119 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
))) {
1124 ih3
= igmpv3_query_hdr(skb
);
1128 max_delay
= ih3
->code
?
1129 IGMPV3_MRC(ih3
->code
) * (HZ
/ IGMP_TIMER_SCALE
) : 1;
1132 br_multicast_query_received(br
, port
, !!iph
->saddr
, max_delay
);
1137 br_vlan_get_tag(skb
, &vid
);
1138 mp
= br_mdb_ip4_get(mlock_dereference(br
->mdb
, br
), group
, vid
);
1142 mod_timer(&mp
->timer
, now
+ br
->multicast_membership_interval
);
1143 mp
->timer_armed
= true;
1145 max_delay
*= br
->multicast_last_member_count
;
1148 (timer_pending(&mp
->timer
) ?
1149 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1150 try_to_del_timer_sync(&mp
->timer
) >= 0))
1151 mod_timer(&mp
->timer
, now
+ max_delay
);
1153 for (pp
= &mp
->ports
;
1154 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1156 if (timer_pending(&p
->timer
) ?
1157 time_after(p
->timer
.expires
, now
+ max_delay
) :
1158 try_to_del_timer_sync(&p
->timer
) >= 0)
1159 mod_timer(&p
->timer
, now
+ max_delay
);
1163 spin_unlock(&br
->multicast_lock
);
1167 #if IS_ENABLED(CONFIG_IPV6)
1168 static int br_ip6_multicast_query(struct net_bridge
*br
,
1169 struct net_bridge_port
*port
,
1170 struct sk_buff
*skb
)
1172 const struct ipv6hdr
*ip6h
= ipv6_hdr(skb
);
1173 struct mld_msg
*mld
;
1174 struct net_bridge_mdb_entry
*mp
;
1175 struct mld2_query
*mld2q
;
1176 struct net_bridge_port_group
*p
;
1177 struct net_bridge_port_group __rcu
**pp
;
1178 unsigned long max_delay
;
1179 unsigned long now
= jiffies
;
1180 const struct in6_addr
*group
= NULL
;
1184 spin_lock(&br
->multicast_lock
);
1185 if (!netif_running(br
->dev
) ||
1186 (port
&& port
->state
== BR_STATE_DISABLED
))
1189 if (skb
->len
== sizeof(*mld
)) {
1190 if (!pskb_may_pull(skb
, sizeof(*mld
))) {
1194 mld
= (struct mld_msg
*) icmp6_hdr(skb
);
1195 max_delay
= msecs_to_jiffies(ntohs(mld
->mld_maxdelay
));
1197 group
= &mld
->mld_mca
;
1199 if (!pskb_may_pull(skb
, sizeof(*mld2q
))) {
1203 mld2q
= (struct mld2_query
*)icmp6_hdr(skb
);
1204 if (!mld2q
->mld2q_nsrcs
)
1205 group
= &mld2q
->mld2q_mca
;
1207 max_delay
= max(msecs_to_jiffies(mldv2_mrc(mld2q
)), 1UL);
1210 br_multicast_query_received(br
, port
, !ipv6_addr_any(&ip6h
->saddr
),
1216 br_vlan_get_tag(skb
, &vid
);
1217 mp
= br_mdb_ip6_get(mlock_dereference(br
->mdb
, br
), group
, vid
);
1221 mod_timer(&mp
->timer
, now
+ br
->multicast_membership_interval
);
1222 mp
->timer_armed
= true;
1224 max_delay
*= br
->multicast_last_member_count
;
1226 (timer_pending(&mp
->timer
) ?
1227 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1228 try_to_del_timer_sync(&mp
->timer
) >= 0))
1229 mod_timer(&mp
->timer
, now
+ max_delay
);
1231 for (pp
= &mp
->ports
;
1232 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1234 if (timer_pending(&p
->timer
) ?
1235 time_after(p
->timer
.expires
, now
+ max_delay
) :
1236 try_to_del_timer_sync(&p
->timer
) >= 0)
1237 mod_timer(&p
->timer
, now
+ max_delay
);
1241 spin_unlock(&br
->multicast_lock
);
1246 static void br_multicast_leave_group(struct net_bridge
*br
,
1247 struct net_bridge_port
*port
,
1248 struct br_ip
*group
)
1250 struct net_bridge_mdb_htable
*mdb
;
1251 struct net_bridge_mdb_entry
*mp
;
1252 struct net_bridge_port_group
*p
;
1256 spin_lock(&br
->multicast_lock
);
1257 if (!netif_running(br
->dev
) ||
1258 (port
&& port
->state
== BR_STATE_DISABLED
) ||
1259 timer_pending(&br
->multicast_querier_timer
))
1262 mdb
= mlock_dereference(br
->mdb
, br
);
1263 mp
= br_mdb_ip_get(mdb
, group
);
1267 if (br
->multicast_querier
&&
1268 !timer_pending(&br
->multicast_querier_timer
)) {
1269 __br_multicast_send_query(br
, port
, &mp
->addr
);
1271 time
= jiffies
+ br
->multicast_last_member_count
*
1272 br
->multicast_last_member_interval
;
1273 mod_timer(port
? &port
->multicast_query_timer
:
1274 &br
->multicast_query_timer
, time
);
1276 for (p
= mlock_dereference(mp
->ports
, br
);
1278 p
= mlock_dereference(p
->next
, br
)) {
1279 if (p
->port
!= port
)
1282 if (!hlist_unhashed(&p
->mglist
) &&
1283 (timer_pending(&p
->timer
) ?
1284 time_after(p
->timer
.expires
, time
) :
1285 try_to_del_timer_sync(&p
->timer
) >= 0)) {
1286 mod_timer(&p
->timer
, time
);
1293 if (port
&& (port
->flags
& BR_MULTICAST_FAST_LEAVE
)) {
1294 struct net_bridge_port_group __rcu
**pp
;
1296 for (pp
= &mp
->ports
;
1297 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1299 if (p
->port
!= port
)
1302 rcu_assign_pointer(*pp
, p
->next
);
1303 hlist_del_init(&p
->mglist
);
1304 del_timer(&p
->timer
);
1305 call_rcu_bh(&p
->rcu
, br_multicast_free_pg
);
1306 br_mdb_notify(br
->dev
, port
, group
, RTM_DELMDB
);
1308 if (!mp
->ports
&& !mp
->mglist
&& mp
->timer_armed
&&
1309 netif_running(br
->dev
))
1310 mod_timer(&mp
->timer
, jiffies
);
1316 time
= now
+ br
->multicast_last_member_count
*
1317 br
->multicast_last_member_interval
;
1320 if (mp
->mglist
&& mp
->timer_armed
&&
1321 (timer_pending(&mp
->timer
) ?
1322 time_after(mp
->timer
.expires
, time
) :
1323 try_to_del_timer_sync(&mp
->timer
) >= 0)) {
1324 mod_timer(&mp
->timer
, time
);
1329 spin_unlock(&br
->multicast_lock
);
1332 static void br_ip4_multicast_leave_group(struct net_bridge
*br
,
1333 struct net_bridge_port
*port
,
1337 struct br_ip br_group
;
1339 if (ipv4_is_local_multicast(group
))
1342 br_group
.u
.ip4
= group
;
1343 br_group
.proto
= htons(ETH_P_IP
);
1346 br_multicast_leave_group(br
, port
, &br_group
);
1349 #if IS_ENABLED(CONFIG_IPV6)
1350 static void br_ip6_multicast_leave_group(struct net_bridge
*br
,
1351 struct net_bridge_port
*port
,
1352 const struct in6_addr
*group
,
1355 struct br_ip br_group
;
1357 if (!ipv6_is_transient_multicast(group
))
1360 br_group
.u
.ip6
= *group
;
1361 br_group
.proto
= htons(ETH_P_IPV6
);
1364 br_multicast_leave_group(br
, port
, &br_group
);
1368 static int br_multicast_ipv4_rcv(struct net_bridge
*br
,
1369 struct net_bridge_port
*port
,
1370 struct sk_buff
*skb
)
1372 struct sk_buff
*skb2
= skb
;
1373 const struct iphdr
*iph
;
1376 unsigned int offset
;
1380 /* We treat OOM as packet loss for now. */
1381 if (!pskb_may_pull(skb
, sizeof(*iph
)))
1386 if (iph
->ihl
< 5 || iph
->version
!= 4)
1389 if (!pskb_may_pull(skb
, ip_hdrlen(skb
)))
1394 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1397 if (iph
->protocol
!= IPPROTO_IGMP
) {
1398 if (!ipv4_is_local_multicast(iph
->daddr
))
1399 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1403 len
= ntohs(iph
->tot_len
);
1404 if (skb
->len
< len
|| len
< ip_hdrlen(skb
))
1407 if (skb
->len
> len
) {
1408 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1412 err
= pskb_trim_rcsum(skb2
, len
);
1417 len
-= ip_hdrlen(skb2
);
1418 offset
= skb_network_offset(skb2
) + ip_hdrlen(skb2
);
1419 __skb_pull(skb2
, offset
);
1420 skb_reset_transport_header(skb2
);
1423 if (!pskb_may_pull(skb2
, sizeof(*ih
)))
1426 switch (skb2
->ip_summed
) {
1427 case CHECKSUM_COMPLETE
:
1428 if (!csum_fold(skb2
->csum
))
1433 if (skb_checksum_complete(skb2
))
1439 br_vlan_get_tag(skb2
, &vid
);
1440 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1441 ih
= igmp_hdr(skb2
);
1444 case IGMP_HOST_MEMBERSHIP_REPORT
:
1445 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1446 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1447 err
= br_ip4_multicast_add_group(br
, port
, ih
->group
, vid
);
1449 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1450 err
= br_ip4_multicast_igmp3_report(br
, port
, skb2
);
1452 case IGMP_HOST_MEMBERSHIP_QUERY
:
1453 err
= br_ip4_multicast_query(br
, port
, skb2
);
1455 case IGMP_HOST_LEAVE_MESSAGE
:
1456 br_ip4_multicast_leave_group(br
, port
, ih
->group
, vid
);
1461 __skb_push(skb2
, offset
);
1468 #if IS_ENABLED(CONFIG_IPV6)
1469 static int br_multicast_ipv6_rcv(struct net_bridge
*br
,
1470 struct net_bridge_port
*port
,
1471 struct sk_buff
*skb
)
1473 struct sk_buff
*skb2
;
1474 const struct ipv6hdr
*ip6h
;
1483 if (!pskb_may_pull(skb
, sizeof(*ip6h
)))
1486 ip6h
= ipv6_hdr(skb
);
1489 * We're interested in MLD messages only.
1491 * - MLD has always Router Alert hop-by-hop option
1492 * - But we do not support jumbrograms.
1494 if (ip6h
->version
!= 6)
1497 /* Prevent flooding this packet if there is no listener present */
1498 if (ipv6_is_transient_multicast(&ip6h
->daddr
))
1499 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1501 if (ip6h
->nexthdr
!= IPPROTO_HOPOPTS
||
1502 ip6h
->payload_len
== 0)
1505 len
= ntohs(ip6h
->payload_len
) + sizeof(*ip6h
);
1509 nexthdr
= ip6h
->nexthdr
;
1510 offset
= ipv6_skip_exthdr(skb
, sizeof(*ip6h
), &nexthdr
, &frag_off
);
1512 if (offset
< 0 || nexthdr
!= IPPROTO_ICMPV6
)
1515 /* Okay, we found ICMPv6 header */
1516 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1521 if (!pskb_may_pull(skb2
, offset
+ sizeof(struct icmp6hdr
)))
1524 len
-= offset
- skb_network_offset(skb2
);
1526 __skb_pull(skb2
, offset
);
1527 skb_reset_transport_header(skb2
);
1528 skb_postpull_rcsum(skb2
, skb_network_header(skb2
),
1529 skb_network_header_len(skb2
));
1531 icmp6_type
= icmp6_hdr(skb2
)->icmp6_type
;
1533 switch (icmp6_type
) {
1534 case ICMPV6_MGM_QUERY
:
1535 case ICMPV6_MGM_REPORT
:
1536 case ICMPV6_MGM_REDUCTION
:
1537 case ICMPV6_MLD2_REPORT
:
1544 /* Okay, we found MLD message. Check further. */
1545 if (skb2
->len
> len
) {
1546 err
= pskb_trim_rcsum(skb2
, len
);
1552 ip6h
= ipv6_hdr(skb2
);
1554 switch (skb2
->ip_summed
) {
1555 case CHECKSUM_COMPLETE
:
1556 if (!csum_ipv6_magic(&ip6h
->saddr
, &ip6h
->daddr
, skb2
->len
,
1557 IPPROTO_ICMPV6
, skb2
->csum
))
1561 skb2
->csum
= ~csum_unfold(csum_ipv6_magic(&ip6h
->saddr
,
1564 IPPROTO_ICMPV6
, 0));
1565 if (__skb_checksum_complete(skb2
))
1571 br_vlan_get_tag(skb
, &vid
);
1572 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1574 switch (icmp6_type
) {
1575 case ICMPV6_MGM_REPORT
:
1577 struct mld_msg
*mld
;
1578 if (!pskb_may_pull(skb2
, sizeof(*mld
))) {
1582 mld
= (struct mld_msg
*)skb_transport_header(skb2
);
1583 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1584 err
= br_ip6_multicast_add_group(br
, port
, &mld
->mld_mca
, vid
);
1587 case ICMPV6_MLD2_REPORT
:
1588 err
= br_ip6_multicast_mld2_report(br
, port
, skb2
);
1590 case ICMPV6_MGM_QUERY
:
1591 err
= br_ip6_multicast_query(br
, port
, skb2
);
1593 case ICMPV6_MGM_REDUCTION
:
1595 struct mld_msg
*mld
;
1596 if (!pskb_may_pull(skb2
, sizeof(*mld
))) {
1600 mld
= (struct mld_msg
*)skb_transport_header(skb2
);
1601 br_ip6_multicast_leave_group(br
, port
, &mld
->mld_mca
, vid
);
1611 int br_multicast_rcv(struct net_bridge
*br
, struct net_bridge_port
*port
,
1612 struct sk_buff
*skb
)
1614 BR_INPUT_SKB_CB(skb
)->igmp
= 0;
1615 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 0;
1617 if (br
->multicast_disabled
)
1620 switch (skb
->protocol
) {
1621 case htons(ETH_P_IP
):
1622 return br_multicast_ipv4_rcv(br
, port
, skb
);
1623 #if IS_ENABLED(CONFIG_IPV6)
1624 case htons(ETH_P_IPV6
):
1625 return br_multicast_ipv6_rcv(br
, port
, skb
);
1632 static void br_multicast_query_expired(unsigned long data
)
1634 struct net_bridge
*br
= (void *)data
;
1636 spin_lock(&br
->multicast_lock
);
1637 if (br
->multicast_startup_queries_sent
<
1638 br
->multicast_startup_query_count
)
1639 br
->multicast_startup_queries_sent
++;
1641 br_multicast_send_query(br
, NULL
, br
->multicast_startup_queries_sent
);
1643 spin_unlock(&br
->multicast_lock
);
1646 void br_multicast_init(struct net_bridge
*br
)
1648 br
->hash_elasticity
= 4;
1651 br
->multicast_router
= 1;
1652 br
->multicast_querier
= 0;
1653 br
->multicast_query_use_ifaddr
= 0;
1654 br
->multicast_last_member_count
= 2;
1655 br
->multicast_startup_query_count
= 2;
1657 br
->multicast_last_member_interval
= HZ
;
1658 br
->multicast_query_response_interval
= 10 * HZ
;
1659 br
->multicast_startup_query_interval
= 125 * HZ
/ 4;
1660 br
->multicast_query_interval
= 125 * HZ
;
1661 br
->multicast_querier_interval
= 255 * HZ
;
1662 br
->multicast_membership_interval
= 260 * HZ
;
1664 br
->multicast_querier_delay_time
= 0;
1666 spin_lock_init(&br
->multicast_lock
);
1667 setup_timer(&br
->multicast_router_timer
,
1668 br_multicast_local_router_expired
, 0);
1669 setup_timer(&br
->multicast_querier_timer
,
1670 br_multicast_querier_expired
, (unsigned long)br
);
1671 setup_timer(&br
->multicast_query_timer
, br_multicast_query_expired
,
1675 void br_multicast_open(struct net_bridge
*br
)
1677 br
->multicast_startup_queries_sent
= 0;
1679 if (br
->multicast_disabled
)
1682 mod_timer(&br
->multicast_query_timer
, jiffies
);
1685 void br_multicast_stop(struct net_bridge
*br
)
1687 struct net_bridge_mdb_htable
*mdb
;
1688 struct net_bridge_mdb_entry
*mp
;
1689 struct hlist_node
*n
;
1693 del_timer_sync(&br
->multicast_router_timer
);
1694 del_timer_sync(&br
->multicast_querier_timer
);
1695 del_timer_sync(&br
->multicast_query_timer
);
1697 spin_lock_bh(&br
->multicast_lock
);
1698 mdb
= mlock_dereference(br
->mdb
, br
);
1705 for (i
= 0; i
< mdb
->max
; i
++) {
1706 hlist_for_each_entry_safe(mp
, n
, &mdb
->mhash
[i
],
1708 del_timer(&mp
->timer
);
1709 mp
->timer_armed
= false;
1710 call_rcu_bh(&mp
->rcu
, br_multicast_free_group
);
1715 spin_unlock_bh(&br
->multicast_lock
);
1717 spin_lock_bh(&br
->multicast_lock
);
1722 call_rcu_bh(&mdb
->rcu
, br_mdb_free
);
1725 spin_unlock_bh(&br
->multicast_lock
);
1728 int br_multicast_set_router(struct net_bridge
*br
, unsigned long val
)
1732 spin_lock_bh(&br
->multicast_lock
);
1733 if (!netif_running(br
->dev
))
1739 del_timer(&br
->multicast_router_timer
);
1742 br
->multicast_router
= val
;
1752 spin_unlock_bh(&br
->multicast_lock
);
1757 int br_multicast_set_port_router(struct net_bridge_port
*p
, unsigned long val
)
1759 struct net_bridge
*br
= p
->br
;
1762 spin_lock(&br
->multicast_lock
);
1763 if (!netif_running(br
->dev
) || p
->state
== BR_STATE_DISABLED
)
1770 p
->multicast_router
= val
;
1773 if (val
< 2 && !hlist_unhashed(&p
->rlist
))
1774 hlist_del_init_rcu(&p
->rlist
);
1779 del_timer(&p
->multicast_router_timer
);
1784 br_multicast_add_router(br
, p
);
1793 spin_unlock(&br
->multicast_lock
);
1798 static void br_multicast_start_querier(struct net_bridge
*br
)
1800 struct net_bridge_port
*port
;
1802 br_multicast_open(br
);
1804 list_for_each_entry(port
, &br
->port_list
, list
) {
1805 if (port
->state
== BR_STATE_DISABLED
||
1806 port
->state
== BR_STATE_BLOCKING
)
1809 __br_multicast_enable_port(port
);
1813 int br_multicast_toggle(struct net_bridge
*br
, unsigned long val
)
1816 struct net_bridge_mdb_htable
*mdb
;
1818 spin_lock_bh(&br
->multicast_lock
);
1819 if (br
->multicast_disabled
== !val
)
1822 br
->multicast_disabled
= !val
;
1823 if (br
->multicast_disabled
)
1826 if (!netif_running(br
->dev
))
1829 mdb
= mlock_dereference(br
->mdb
, br
);
1834 br
->multicast_disabled
= !!val
;
1838 err
= br_mdb_rehash(&br
->mdb
, mdb
->max
,
1839 br
->hash_elasticity
);
1844 br_multicast_start_querier(br
);
1847 spin_unlock_bh(&br
->multicast_lock
);
1852 int br_multicast_set_querier(struct net_bridge
*br
, unsigned long val
)
1854 unsigned long max_delay
;
1858 spin_lock_bh(&br
->multicast_lock
);
1859 if (br
->multicast_querier
== val
)
1862 br
->multicast_querier
= val
;
1866 max_delay
= br
->multicast_query_response_interval
;
1867 if (!timer_pending(&br
->multicast_querier_timer
))
1868 br
->multicast_querier_delay_time
= jiffies
+ max_delay
;
1870 br_multicast_start_querier(br
);
1873 spin_unlock_bh(&br
->multicast_lock
);
1878 int br_multicast_set_hash_max(struct net_bridge
*br
, unsigned long val
)
1882 struct net_bridge_mdb_htable
*mdb
;
1884 spin_lock(&br
->multicast_lock
);
1885 if (!netif_running(br
->dev
))
1889 if (!is_power_of_2(val
))
1892 mdb
= mlock_dereference(br
->mdb
, br
);
1893 if (mdb
&& val
< mdb
->size
)
1909 err
= br_mdb_rehash(&br
->mdb
, br
->hash_max
,
1910 br
->hash_elasticity
);
1916 spin_unlock(&br
->multicast_lock
);