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
;
1198 } else if (skb
->len
>= sizeof(*mld2q
)) {
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
;
1206 max_delay
= mld2q
->mld2q_mrc
? MLDV2_MRC(ntohs(mld2q
->mld2q_mrc
)) : 1;
1209 br_multicast_query_received(br
, port
, !ipv6_addr_any(&ip6h
->saddr
),
1215 br_vlan_get_tag(skb
, &vid
);
1216 mp
= br_mdb_ip6_get(mlock_dereference(br
->mdb
, br
), group
, vid
);
1220 mod_timer(&mp
->timer
, now
+ br
->multicast_membership_interval
);
1221 mp
->timer_armed
= true;
1223 max_delay
*= br
->multicast_last_member_count
;
1225 (timer_pending(&mp
->timer
) ?
1226 time_after(mp
->timer
.expires
, now
+ max_delay
) :
1227 try_to_del_timer_sync(&mp
->timer
) >= 0))
1228 mod_timer(&mp
->timer
, now
+ max_delay
);
1230 for (pp
= &mp
->ports
;
1231 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1233 if (timer_pending(&p
->timer
) ?
1234 time_after(p
->timer
.expires
, now
+ max_delay
) :
1235 try_to_del_timer_sync(&p
->timer
) >= 0)
1236 mod_timer(&p
->timer
, now
+ max_delay
);
1240 spin_unlock(&br
->multicast_lock
);
1245 static void br_multicast_leave_group(struct net_bridge
*br
,
1246 struct net_bridge_port
*port
,
1247 struct br_ip
*group
)
1249 struct net_bridge_mdb_htable
*mdb
;
1250 struct net_bridge_mdb_entry
*mp
;
1251 struct net_bridge_port_group
*p
;
1255 spin_lock(&br
->multicast_lock
);
1256 if (!netif_running(br
->dev
) ||
1257 (port
&& port
->state
== BR_STATE_DISABLED
) ||
1258 timer_pending(&br
->multicast_querier_timer
))
1261 mdb
= mlock_dereference(br
->mdb
, br
);
1262 mp
= br_mdb_ip_get(mdb
, group
);
1266 if (br
->multicast_querier
&&
1267 !timer_pending(&br
->multicast_querier_timer
)) {
1268 __br_multicast_send_query(br
, port
, &mp
->addr
);
1270 time
= jiffies
+ br
->multicast_last_member_count
*
1271 br
->multicast_last_member_interval
;
1272 mod_timer(port
? &port
->multicast_query_timer
:
1273 &br
->multicast_query_timer
, time
);
1275 for (p
= mlock_dereference(mp
->ports
, br
);
1277 p
= mlock_dereference(p
->next
, br
)) {
1278 if (p
->port
!= port
)
1281 if (!hlist_unhashed(&p
->mglist
) &&
1282 (timer_pending(&p
->timer
) ?
1283 time_after(p
->timer
.expires
, time
) :
1284 try_to_del_timer_sync(&p
->timer
) >= 0)) {
1285 mod_timer(&p
->timer
, time
);
1292 if (port
&& (port
->flags
& BR_MULTICAST_FAST_LEAVE
)) {
1293 struct net_bridge_port_group __rcu
**pp
;
1295 for (pp
= &mp
->ports
;
1296 (p
= mlock_dereference(*pp
, br
)) != NULL
;
1298 if (p
->port
!= port
)
1301 rcu_assign_pointer(*pp
, p
->next
);
1302 hlist_del_init(&p
->mglist
);
1303 del_timer(&p
->timer
);
1304 call_rcu_bh(&p
->rcu
, br_multicast_free_pg
);
1305 br_mdb_notify(br
->dev
, port
, group
, RTM_DELMDB
);
1307 if (!mp
->ports
&& !mp
->mglist
&& mp
->timer_armed
&&
1308 netif_running(br
->dev
))
1309 mod_timer(&mp
->timer
, jiffies
);
1315 time
= now
+ br
->multicast_last_member_count
*
1316 br
->multicast_last_member_interval
;
1319 if (mp
->mglist
&& mp
->timer_armed
&&
1320 (timer_pending(&mp
->timer
) ?
1321 time_after(mp
->timer
.expires
, time
) :
1322 try_to_del_timer_sync(&mp
->timer
) >= 0)) {
1323 mod_timer(&mp
->timer
, time
);
1328 spin_unlock(&br
->multicast_lock
);
1331 static void br_ip4_multicast_leave_group(struct net_bridge
*br
,
1332 struct net_bridge_port
*port
,
1336 struct br_ip br_group
;
1338 if (ipv4_is_local_multicast(group
))
1341 br_group
.u
.ip4
= group
;
1342 br_group
.proto
= htons(ETH_P_IP
);
1345 br_multicast_leave_group(br
, port
, &br_group
);
1348 #if IS_ENABLED(CONFIG_IPV6)
1349 static void br_ip6_multicast_leave_group(struct net_bridge
*br
,
1350 struct net_bridge_port
*port
,
1351 const struct in6_addr
*group
,
1354 struct br_ip br_group
;
1356 if (!ipv6_is_transient_multicast(group
))
1359 br_group
.u
.ip6
= *group
;
1360 br_group
.proto
= htons(ETH_P_IPV6
);
1363 br_multicast_leave_group(br
, port
, &br_group
);
1367 static int br_multicast_ipv4_rcv(struct net_bridge
*br
,
1368 struct net_bridge_port
*port
,
1369 struct sk_buff
*skb
)
1371 struct sk_buff
*skb2
= skb
;
1372 const struct iphdr
*iph
;
1375 unsigned int offset
;
1379 /* We treat OOM as packet loss for now. */
1380 if (!pskb_may_pull(skb
, sizeof(*iph
)))
1385 if (iph
->ihl
< 5 || iph
->version
!= 4)
1388 if (!pskb_may_pull(skb
, ip_hdrlen(skb
)))
1393 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1396 if (iph
->protocol
!= IPPROTO_IGMP
) {
1397 if (!ipv4_is_local_multicast(iph
->daddr
))
1398 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1402 len
= ntohs(iph
->tot_len
);
1403 if (skb
->len
< len
|| len
< ip_hdrlen(skb
))
1406 if (skb
->len
> len
) {
1407 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1411 err
= pskb_trim_rcsum(skb2
, len
);
1416 len
-= ip_hdrlen(skb2
);
1417 offset
= skb_network_offset(skb2
) + ip_hdrlen(skb2
);
1418 __skb_pull(skb2
, offset
);
1419 skb_reset_transport_header(skb2
);
1422 if (!pskb_may_pull(skb2
, sizeof(*ih
)))
1425 switch (skb2
->ip_summed
) {
1426 case CHECKSUM_COMPLETE
:
1427 if (!csum_fold(skb2
->csum
))
1432 if (skb_checksum_complete(skb2
))
1438 br_vlan_get_tag(skb2
, &vid
);
1439 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1440 ih
= igmp_hdr(skb2
);
1443 case IGMP_HOST_MEMBERSHIP_REPORT
:
1444 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1445 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1446 err
= br_ip4_multicast_add_group(br
, port
, ih
->group
, vid
);
1448 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1449 err
= br_ip4_multicast_igmp3_report(br
, port
, skb2
);
1451 case IGMP_HOST_MEMBERSHIP_QUERY
:
1452 err
= br_ip4_multicast_query(br
, port
, skb2
);
1454 case IGMP_HOST_LEAVE_MESSAGE
:
1455 br_ip4_multicast_leave_group(br
, port
, ih
->group
, vid
);
1460 __skb_push(skb2
, offset
);
1467 #if IS_ENABLED(CONFIG_IPV6)
1468 static int br_multicast_ipv6_rcv(struct net_bridge
*br
,
1469 struct net_bridge_port
*port
,
1470 struct sk_buff
*skb
)
1472 struct sk_buff
*skb2
;
1473 const struct ipv6hdr
*ip6h
;
1482 if (!pskb_may_pull(skb
, sizeof(*ip6h
)))
1485 ip6h
= ipv6_hdr(skb
);
1488 * We're interested in MLD messages only.
1490 * - MLD has always Router Alert hop-by-hop option
1491 * - But we do not support jumbrograms.
1493 if (ip6h
->version
!= 6 ||
1494 ip6h
->nexthdr
!= IPPROTO_HOPOPTS
||
1495 ip6h
->payload_len
== 0)
1498 len
= ntohs(ip6h
->payload_len
) + sizeof(*ip6h
);
1502 nexthdr
= ip6h
->nexthdr
;
1503 offset
= ipv6_skip_exthdr(skb
, sizeof(*ip6h
), &nexthdr
, &frag_off
);
1505 if (offset
< 0 || nexthdr
!= IPPROTO_ICMPV6
)
1508 /* Okay, we found ICMPv6 header */
1509 skb2
= skb_clone(skb
, GFP_ATOMIC
);
1514 if (!pskb_may_pull(skb2
, offset
+ sizeof(struct icmp6hdr
)))
1517 len
-= offset
- skb_network_offset(skb2
);
1519 __skb_pull(skb2
, offset
);
1520 skb_reset_transport_header(skb2
);
1521 skb_postpull_rcsum(skb2
, skb_network_header(skb2
),
1522 skb_network_header_len(skb2
));
1524 icmp6_type
= icmp6_hdr(skb2
)->icmp6_type
;
1526 switch (icmp6_type
) {
1527 case ICMPV6_MGM_QUERY
:
1528 case ICMPV6_MGM_REPORT
:
1529 case ICMPV6_MGM_REDUCTION
:
1530 case ICMPV6_MLD2_REPORT
:
1537 /* Okay, we found MLD message. Check further. */
1538 if (skb2
->len
> len
) {
1539 err
= pskb_trim_rcsum(skb2
, len
);
1545 ip6h
= ipv6_hdr(skb2
);
1547 switch (skb2
->ip_summed
) {
1548 case CHECKSUM_COMPLETE
:
1549 if (!csum_ipv6_magic(&ip6h
->saddr
, &ip6h
->daddr
, skb2
->len
,
1550 IPPROTO_ICMPV6
, skb2
->csum
))
1554 skb2
->csum
= ~csum_unfold(csum_ipv6_magic(&ip6h
->saddr
,
1557 IPPROTO_ICMPV6
, 0));
1558 if (__skb_checksum_complete(skb2
))
1564 br_vlan_get_tag(skb
, &vid
);
1565 BR_INPUT_SKB_CB(skb
)->igmp
= 1;
1567 switch (icmp6_type
) {
1568 case ICMPV6_MGM_REPORT
:
1570 struct mld_msg
*mld
;
1571 if (!pskb_may_pull(skb2
, sizeof(*mld
))) {
1575 mld
= (struct mld_msg
*)skb_transport_header(skb2
);
1576 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 1;
1577 err
= br_ip6_multicast_add_group(br
, port
, &mld
->mld_mca
, vid
);
1580 case ICMPV6_MLD2_REPORT
:
1581 err
= br_ip6_multicast_mld2_report(br
, port
, skb2
);
1583 case ICMPV6_MGM_QUERY
:
1584 err
= br_ip6_multicast_query(br
, port
, skb2
);
1586 case ICMPV6_MGM_REDUCTION
:
1588 struct mld_msg
*mld
;
1589 if (!pskb_may_pull(skb2
, sizeof(*mld
))) {
1593 mld
= (struct mld_msg
*)skb_transport_header(skb2
);
1594 br_ip6_multicast_leave_group(br
, port
, &mld
->mld_mca
, vid
);
1604 int br_multicast_rcv(struct net_bridge
*br
, struct net_bridge_port
*port
,
1605 struct sk_buff
*skb
)
1607 BR_INPUT_SKB_CB(skb
)->igmp
= 0;
1608 BR_INPUT_SKB_CB(skb
)->mrouters_only
= 0;
1610 if (br
->multicast_disabled
)
1613 switch (skb
->protocol
) {
1614 case htons(ETH_P_IP
):
1615 return br_multicast_ipv4_rcv(br
, port
, skb
);
1616 #if IS_ENABLED(CONFIG_IPV6)
1617 case htons(ETH_P_IPV6
):
1618 return br_multicast_ipv6_rcv(br
, port
, skb
);
1625 static void br_multicast_query_expired(unsigned long data
)
1627 struct net_bridge
*br
= (void *)data
;
1629 spin_lock(&br
->multicast_lock
);
1630 if (br
->multicast_startup_queries_sent
<
1631 br
->multicast_startup_query_count
)
1632 br
->multicast_startup_queries_sent
++;
1634 br_multicast_send_query(br
, NULL
, br
->multicast_startup_queries_sent
);
1636 spin_unlock(&br
->multicast_lock
);
1639 void br_multicast_init(struct net_bridge
*br
)
1641 br
->hash_elasticity
= 4;
1644 br
->multicast_router
= 1;
1645 br
->multicast_querier
= 0;
1646 br
->multicast_query_use_ifaddr
= 0;
1647 br
->multicast_last_member_count
= 2;
1648 br
->multicast_startup_query_count
= 2;
1650 br
->multicast_last_member_interval
= HZ
;
1651 br
->multicast_query_response_interval
= 10 * HZ
;
1652 br
->multicast_startup_query_interval
= 125 * HZ
/ 4;
1653 br
->multicast_query_interval
= 125 * HZ
;
1654 br
->multicast_querier_interval
= 255 * HZ
;
1655 br
->multicast_membership_interval
= 260 * HZ
;
1657 br
->multicast_querier_delay_time
= 0;
1659 spin_lock_init(&br
->multicast_lock
);
1660 setup_timer(&br
->multicast_router_timer
,
1661 br_multicast_local_router_expired
, 0);
1662 setup_timer(&br
->multicast_querier_timer
,
1663 br_multicast_querier_expired
, (unsigned long)br
);
1664 setup_timer(&br
->multicast_query_timer
, br_multicast_query_expired
,
1668 void br_multicast_open(struct net_bridge
*br
)
1670 br
->multicast_startup_queries_sent
= 0;
1672 if (br
->multicast_disabled
)
1675 mod_timer(&br
->multicast_query_timer
, jiffies
);
1678 void br_multicast_stop(struct net_bridge
*br
)
1680 struct net_bridge_mdb_htable
*mdb
;
1681 struct net_bridge_mdb_entry
*mp
;
1682 struct hlist_node
*n
;
1686 del_timer_sync(&br
->multicast_router_timer
);
1687 del_timer_sync(&br
->multicast_querier_timer
);
1688 del_timer_sync(&br
->multicast_query_timer
);
1690 spin_lock_bh(&br
->multicast_lock
);
1691 mdb
= mlock_dereference(br
->mdb
, br
);
1698 for (i
= 0; i
< mdb
->max
; i
++) {
1699 hlist_for_each_entry_safe(mp
, n
, &mdb
->mhash
[i
],
1701 del_timer(&mp
->timer
);
1702 mp
->timer_armed
= false;
1703 call_rcu_bh(&mp
->rcu
, br_multicast_free_group
);
1708 spin_unlock_bh(&br
->multicast_lock
);
1710 spin_lock_bh(&br
->multicast_lock
);
1715 call_rcu_bh(&mdb
->rcu
, br_mdb_free
);
1718 spin_unlock_bh(&br
->multicast_lock
);
1721 int br_multicast_set_router(struct net_bridge
*br
, unsigned long val
)
1725 spin_lock_bh(&br
->multicast_lock
);
1726 if (!netif_running(br
->dev
))
1732 del_timer(&br
->multicast_router_timer
);
1735 br
->multicast_router
= val
;
1745 spin_unlock_bh(&br
->multicast_lock
);
1750 int br_multicast_set_port_router(struct net_bridge_port
*p
, unsigned long val
)
1752 struct net_bridge
*br
= p
->br
;
1755 spin_lock(&br
->multicast_lock
);
1756 if (!netif_running(br
->dev
) || p
->state
== BR_STATE_DISABLED
)
1763 p
->multicast_router
= val
;
1766 if (val
< 2 && !hlist_unhashed(&p
->rlist
))
1767 hlist_del_init_rcu(&p
->rlist
);
1772 del_timer(&p
->multicast_router_timer
);
1777 br_multicast_add_router(br
, p
);
1786 spin_unlock(&br
->multicast_lock
);
1791 static void br_multicast_start_querier(struct net_bridge
*br
)
1793 struct net_bridge_port
*port
;
1795 br_multicast_open(br
);
1797 list_for_each_entry(port
, &br
->port_list
, list
) {
1798 if (port
->state
== BR_STATE_DISABLED
||
1799 port
->state
== BR_STATE_BLOCKING
)
1802 __br_multicast_enable_port(port
);
1806 int br_multicast_toggle(struct net_bridge
*br
, unsigned long val
)
1809 struct net_bridge_mdb_htable
*mdb
;
1811 spin_lock_bh(&br
->multicast_lock
);
1812 if (br
->multicast_disabled
== !val
)
1815 br
->multicast_disabled
= !val
;
1816 if (br
->multicast_disabled
)
1819 if (!netif_running(br
->dev
))
1822 mdb
= mlock_dereference(br
->mdb
, br
);
1827 br
->multicast_disabled
= !!val
;
1831 err
= br_mdb_rehash(&br
->mdb
, mdb
->max
,
1832 br
->hash_elasticity
);
1837 br_multicast_start_querier(br
);
1840 spin_unlock_bh(&br
->multicast_lock
);
1845 int br_multicast_set_querier(struct net_bridge
*br
, unsigned long val
)
1847 unsigned long max_delay
;
1851 spin_lock_bh(&br
->multicast_lock
);
1852 if (br
->multicast_querier
== val
)
1855 br
->multicast_querier
= val
;
1859 max_delay
= br
->multicast_query_response_interval
;
1860 if (!timer_pending(&br
->multicast_querier_timer
))
1861 br
->multicast_querier_delay_time
= jiffies
+ max_delay
;
1863 br_multicast_start_querier(br
);
1866 spin_unlock_bh(&br
->multicast_lock
);
1871 int br_multicast_set_hash_max(struct net_bridge
*br
, unsigned long val
)
1875 struct net_bridge_mdb_htable
*mdb
;
1877 spin_lock(&br
->multicast_lock
);
1878 if (!netif_running(br
->dev
))
1882 if (!is_power_of_2(val
))
1885 mdb
= mlock_dereference(br
->mdb
, br
);
1886 if (mdb
&& val
< mdb
->size
)
1902 err
= br_mdb_rehash(&br
->mdb
, br
->hash_max
,
1903 br
->hash_elasticity
);
1909 spin_unlock(&br
->multicast_lock
);