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>
28 #include "br_private.h"
30 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
32 if (a->proto != b->proto)
36 return a->u.ip4 == b->u.ip4;
41 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
43 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
46 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
51 return __br_ip4_hash(mdb, ip->u.ip4);
56 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
57 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
59 struct net_bridge_mdb_entry *mp;
62 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
63 if (br_ip_equal(&mp->addr, dst))
70 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
71 struct net_bridge_mdb_htable *mdb, __be32 dst)
76 br_dst.proto = htons(ETH_P_IP);
78 return __br_mdb_ip_get(mdb, &br_dst, __br_ip4_hash(mdb, dst));
81 static struct net_bridge_mdb_entry *br_mdb_ip_get(
82 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
84 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
87 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
90 struct net_bridge_mdb_htable *mdb = br->mdb;
93 if (!mdb || br->multicast_disabled)
96 if (BR_INPUT_SKB_CB(skb)->igmp)
99 ip.proto = skb->protocol;
101 switch (skb->protocol) {
102 case htons(ETH_P_IP):
103 ip.u.ip4 = ip_hdr(skb)->daddr;
109 return br_mdb_ip_get(mdb, &ip);
112 static void br_mdb_free(struct rcu_head *head)
114 struct net_bridge_mdb_htable *mdb =
115 container_of(head, struct net_bridge_mdb_htable, rcu);
116 struct net_bridge_mdb_htable *old = mdb->old;
123 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
124 struct net_bridge_mdb_htable *old,
127 struct net_bridge_mdb_entry *mp;
128 struct hlist_node *p;
133 for (i = 0; i < old->max; i++)
134 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
135 hlist_add_head(&mp->hlist[new->ver],
136 &new->mhash[br_ip_hash(new, &mp->addr)]);
142 for (i = 0; i < new->max; i++) {
144 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
150 return maxlen > elasticity ? -EINVAL : 0;
153 static void br_multicast_free_pg(struct rcu_head *head)
155 struct net_bridge_port_group *p =
156 container_of(head, struct net_bridge_port_group, rcu);
161 static void br_multicast_free_group(struct rcu_head *head)
163 struct net_bridge_mdb_entry *mp =
164 container_of(head, struct net_bridge_mdb_entry, rcu);
169 static void br_multicast_group_expired(unsigned long data)
171 struct net_bridge_mdb_entry *mp = (void *)data;
172 struct net_bridge *br = mp->br;
173 struct net_bridge_mdb_htable *mdb;
175 spin_lock(&br->multicast_lock);
176 if (!netif_running(br->dev) || timer_pending(&mp->timer))
179 if (!hlist_unhashed(&mp->mglist))
180 hlist_del_init(&mp->mglist);
186 hlist_del_rcu(&mp->hlist[mdb->ver]);
189 del_timer(&mp->query_timer);
190 call_rcu_bh(&mp->rcu, br_multicast_free_group);
193 spin_unlock(&br->multicast_lock);
196 static void br_multicast_del_pg(struct net_bridge *br,
197 struct net_bridge_port_group *pg)
199 struct net_bridge_mdb_htable *mdb = br->mdb;
200 struct net_bridge_mdb_entry *mp;
201 struct net_bridge_port_group *p;
202 struct net_bridge_port_group **pp;
204 mp = br_mdb_ip_get(mdb, &pg->addr);
208 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
213 hlist_del_init(&p->mglist);
214 del_timer(&p->timer);
215 del_timer(&p->query_timer);
216 call_rcu_bh(&p->rcu, br_multicast_free_pg);
218 if (!mp->ports && hlist_unhashed(&mp->mglist) &&
219 netif_running(br->dev))
220 mod_timer(&mp->timer, jiffies);
228 static void br_multicast_port_group_expired(unsigned long data)
230 struct net_bridge_port_group *pg = (void *)data;
231 struct net_bridge *br = pg->port->br;
233 spin_lock(&br->multicast_lock);
234 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
235 hlist_unhashed(&pg->mglist))
238 br_multicast_del_pg(br, pg);
241 spin_unlock(&br->multicast_lock);
244 static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max,
247 struct net_bridge_mdb_htable *old = *mdbp;
248 struct net_bridge_mdb_htable *mdb;
251 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
258 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
264 mdb->size = old ? old->size : 0;
265 mdb->ver = old ? old->ver ^ 1 : 0;
267 if (!old || elasticity)
268 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
270 mdb->secret = old->secret;
275 err = br_mdb_copy(mdb, old, elasticity);
282 call_rcu_bh(&mdb->rcu, br_mdb_free);
285 rcu_assign_pointer(*mdbp, mdb);
290 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
298 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
303 skb->protocol = htons(ETH_P_IP);
305 skb_reset_mac_header(skb);
308 memcpy(eth->h_source, br->dev->dev_addr, 6);
311 eth->h_dest[2] = 0x5e;
315 eth->h_proto = htons(ETH_P_IP);
316 skb_put(skb, sizeof(*eth));
318 skb_set_network_header(skb, skb->len);
324 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
326 iph->frag_off = htons(IP_DF);
328 iph->protocol = IPPROTO_IGMP;
330 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
331 ((u8 *)&iph[1])[0] = IPOPT_RA;
332 ((u8 *)&iph[1])[1] = 4;
333 ((u8 *)&iph[1])[2] = 0;
334 ((u8 *)&iph[1])[3] = 0;
338 skb_set_transport_header(skb, skb->len);
340 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
341 ih->code = (group ? br->multicast_last_member_interval :
342 br->multicast_query_response_interval) /
343 (HZ / IGMP_TIMER_SCALE);
346 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
347 skb_put(skb, sizeof(*ih));
349 __skb_pull(skb, sizeof(*eth));
355 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
358 switch (addr->proto) {
359 case htons(ETH_P_IP):
360 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
365 static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
367 struct net_bridge *br = mp->br;
370 skb = br_multicast_alloc_query(br, &mp->addr);
377 if (++mp->queries_sent < br->multicast_last_member_count)
378 mod_timer(&mp->query_timer,
379 jiffies + br->multicast_last_member_interval);
382 static void br_multicast_group_query_expired(unsigned long data)
384 struct net_bridge_mdb_entry *mp = (void *)data;
385 struct net_bridge *br = mp->br;
387 spin_lock(&br->multicast_lock);
388 if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
389 mp->queries_sent >= br->multicast_last_member_count)
392 br_multicast_send_group_query(mp);
395 spin_unlock(&br->multicast_lock);
398 static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
400 struct net_bridge_port *port = pg->port;
401 struct net_bridge *br = port->br;
404 skb = br_multicast_alloc_query(br, &pg->addr);
408 br_deliver(port, skb);
411 if (++pg->queries_sent < br->multicast_last_member_count)
412 mod_timer(&pg->query_timer,
413 jiffies + br->multicast_last_member_interval);
416 static void br_multicast_port_group_query_expired(unsigned long data)
418 struct net_bridge_port_group *pg = (void *)data;
419 struct net_bridge_port *port = pg->port;
420 struct net_bridge *br = port->br;
422 spin_lock(&br->multicast_lock);
423 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
424 pg->queries_sent >= br->multicast_last_member_count)
427 br_multicast_send_port_group_query(pg);
430 spin_unlock(&br->multicast_lock);
433 static struct net_bridge_mdb_entry *br_multicast_get_group(
434 struct net_bridge *br, struct net_bridge_port *port,
435 struct br_ip *group, int hash)
437 struct net_bridge_mdb_htable *mdb = br->mdb;
438 struct net_bridge_mdb_entry *mp;
439 struct hlist_node *p;
445 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
447 if (unlikely(br_ip_equal(group, &mp->addr)))
454 if (unlikely(count > br->hash_elasticity && count)) {
456 printk(KERN_INFO "%s: Multicast hash table "
457 "chain limit reached: %s\n",
458 br->dev->name, port ? port->dev->name :
461 elasticity = br->hash_elasticity;
464 if (mdb->size >= max) {
466 if (unlikely(max >= br->hash_max)) {
467 printk(KERN_WARNING "%s: Multicast hash table maximum "
468 "reached, disabling snooping: %s, %d\n",
469 br->dev->name, port ? port->dev->name :
474 br->multicast_disabled = 1;
479 if (max > mdb->max || elasticity) {
482 printk(KERN_INFO "%s: Multicast hash table "
484 br->dev->name, port ? port->dev->name :
490 err = br_mdb_rehash(&br->mdb, max, elasticity);
492 printk(KERN_WARNING "%s: Cannot rehash multicast "
493 "hash table, disabling snooping: "
495 br->dev->name, port ? port->dev->name :
512 static struct net_bridge_mdb_entry *br_multicast_new_group(
513 struct net_bridge *br, struct net_bridge_port *port,
516 struct net_bridge_mdb_htable *mdb = br->mdb;
517 struct net_bridge_mdb_entry *mp;
521 if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0))
526 hash = br_ip_hash(mdb, group);
527 mp = br_multicast_get_group(br, port, group, hash);
528 switch (PTR_ERR(mp)) {
535 hash = br_ip_hash(mdb, group);
542 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
548 setup_timer(&mp->timer, br_multicast_group_expired,
550 setup_timer(&mp->query_timer, br_multicast_group_query_expired,
553 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
560 static int br_multicast_add_group(struct net_bridge *br,
561 struct net_bridge_port *port,
564 struct net_bridge_mdb_entry *mp;
565 struct net_bridge_port_group *p;
566 struct net_bridge_port_group **pp;
567 unsigned long now = jiffies;
570 spin_lock(&br->multicast_lock);
571 if (!netif_running(br->dev) ||
572 (port && port->state == BR_STATE_DISABLED))
575 mp = br_multicast_new_group(br, port, group);
577 if (unlikely(IS_ERR(mp) || !mp))
581 hlist_add_head(&mp->mglist, &br->mglist);
582 mod_timer(&mp->timer, now + br->multicast_membership_interval);
586 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
589 if ((unsigned long)p->port < (unsigned long)port)
593 p = kzalloc(sizeof(*p), GFP_ATOMIC);
601 hlist_add_head(&p->mglist, &port->mglist);
602 setup_timer(&p->timer, br_multicast_port_group_expired,
604 setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
607 rcu_assign_pointer(*pp, p);
610 mod_timer(&p->timer, now + br->multicast_membership_interval);
615 spin_unlock(&br->multicast_lock);
619 static int br_ip4_multicast_add_group(struct net_bridge *br,
620 struct net_bridge_port *port,
623 struct br_ip br_group;
625 if (ipv4_is_local_multicast(group))
628 br_group.u.ip4 = group;
629 br_group.proto = htons(ETH_P_IP);
631 return br_multicast_add_group(br, port, &br_group);
634 static void br_multicast_router_expired(unsigned long data)
636 struct net_bridge_port *port = (void *)data;
637 struct net_bridge *br = port->br;
639 spin_lock(&br->multicast_lock);
640 if (port->multicast_router != 1 ||
641 timer_pending(&port->multicast_router_timer) ||
642 hlist_unhashed(&port->rlist))
645 hlist_del_init_rcu(&port->rlist);
648 spin_unlock(&br->multicast_lock);
651 static void br_multicast_local_router_expired(unsigned long data)
655 static void __br_multicast_send_query(struct net_bridge *br,
656 struct net_bridge_port *port,
661 skb = br_multicast_alloc_query(br, ip);
666 __skb_push(skb, sizeof(struct ethhdr));
667 skb->dev = port->dev;
668 NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
674 static void br_multicast_send_query(struct net_bridge *br,
675 struct net_bridge_port *port, u32 sent)
678 struct br_ip br_group;
680 if (!netif_running(br->dev) || br->multicast_disabled ||
681 timer_pending(&br->multicast_querier_timer))
685 br_group.proto = htons(ETH_P_IP);
687 __br_multicast_send_query(br, port, &br_group);
690 time += sent < br->multicast_startup_query_count ?
691 br->multicast_startup_query_interval :
692 br->multicast_query_interval;
693 mod_timer(port ? &port->multicast_query_timer :
694 &br->multicast_query_timer, time);
697 static void br_multicast_port_query_expired(unsigned long data)
699 struct net_bridge_port *port = (void *)data;
700 struct net_bridge *br = port->br;
702 spin_lock(&br->multicast_lock);
703 if (port->state == BR_STATE_DISABLED ||
704 port->state == BR_STATE_BLOCKING)
707 if (port->multicast_startup_queries_sent <
708 br->multicast_startup_query_count)
709 port->multicast_startup_queries_sent++;
711 br_multicast_send_query(port->br, port,
712 port->multicast_startup_queries_sent);
715 spin_unlock(&br->multicast_lock);
718 void br_multicast_add_port(struct net_bridge_port *port)
720 port->multicast_router = 1;
722 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
723 (unsigned long)port);
724 setup_timer(&port->multicast_query_timer,
725 br_multicast_port_query_expired, (unsigned long)port);
728 void br_multicast_del_port(struct net_bridge_port *port)
730 del_timer_sync(&port->multicast_router_timer);
733 static void __br_multicast_enable_port(struct net_bridge_port *port)
735 port->multicast_startup_queries_sent = 0;
737 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
738 del_timer(&port->multicast_query_timer))
739 mod_timer(&port->multicast_query_timer, jiffies);
742 void br_multicast_enable_port(struct net_bridge_port *port)
744 struct net_bridge *br = port->br;
746 spin_lock(&br->multicast_lock);
747 if (br->multicast_disabled || !netif_running(br->dev))
750 __br_multicast_enable_port(port);
753 spin_unlock(&br->multicast_lock);
756 void br_multicast_disable_port(struct net_bridge_port *port)
758 struct net_bridge *br = port->br;
759 struct net_bridge_port_group *pg;
760 struct hlist_node *p, *n;
762 spin_lock(&br->multicast_lock);
763 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
764 br_multicast_del_pg(br, pg);
766 if (!hlist_unhashed(&port->rlist))
767 hlist_del_init_rcu(&port->rlist);
768 del_timer(&port->multicast_router_timer);
769 del_timer(&port->multicast_query_timer);
770 spin_unlock(&br->multicast_lock);
773 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
774 struct net_bridge_port *port,
777 struct igmpv3_report *ih;
778 struct igmpv3_grec *grec;
786 if (!pskb_may_pull(skb, sizeof(*ih)))
789 ih = igmpv3_report_hdr(skb);
790 num = ntohs(ih->ngrec);
793 for (i = 0; i < num; i++) {
794 len += sizeof(*grec);
795 if (!pskb_may_pull(skb, len))
798 grec = (void *)(skb->data + len - sizeof(*grec));
799 group = grec->grec_mca;
800 type = grec->grec_type;
802 len += ntohs(grec->grec_nsrcs) * 4;
803 if (!pskb_may_pull(skb, len))
806 /* We treat this as an IGMPv2 report for now. */
808 case IGMPV3_MODE_IS_INCLUDE:
809 case IGMPV3_MODE_IS_EXCLUDE:
810 case IGMPV3_CHANGE_TO_INCLUDE:
811 case IGMPV3_CHANGE_TO_EXCLUDE:
812 case IGMPV3_ALLOW_NEW_SOURCES:
813 case IGMPV3_BLOCK_OLD_SOURCES:
820 err = br_ip4_multicast_add_group(br, port, group);
828 static void br_multicast_add_router(struct net_bridge *br,
829 struct net_bridge_port *port)
831 struct hlist_node *p;
832 struct hlist_node **h;
834 for (h = &br->router_list.first;
836 (unsigned long)container_of(p, struct net_bridge_port, rlist) >
841 port->rlist.pprev = h;
842 port->rlist.next = p;
843 rcu_assign_pointer(*h, &port->rlist);
845 p->pprev = &port->rlist.next;
848 static void br_multicast_mark_router(struct net_bridge *br,
849 struct net_bridge_port *port)
851 unsigned long now = jiffies;
854 if (br->multicast_router == 1)
855 mod_timer(&br->multicast_router_timer,
856 now + br->multicast_querier_interval);
860 if (port->multicast_router != 1)
863 if (!hlist_unhashed(&port->rlist))
866 br_multicast_add_router(br, port);
869 mod_timer(&port->multicast_router_timer,
870 now + br->multicast_querier_interval);
873 static void br_multicast_query_received(struct net_bridge *br,
874 struct net_bridge_port *port,
878 mod_timer(&br->multicast_querier_timer,
879 jiffies + br->multicast_querier_interval);
880 else if (timer_pending(&br->multicast_querier_timer))
883 br_multicast_mark_router(br, port);
886 static int br_ip4_multicast_query(struct net_bridge *br,
887 struct net_bridge_port *port,
890 struct iphdr *iph = ip_hdr(skb);
891 struct igmphdr *ih = igmp_hdr(skb);
892 struct net_bridge_mdb_entry *mp;
893 struct igmpv3_query *ih3;
894 struct net_bridge_port_group *p;
895 struct net_bridge_port_group **pp;
896 unsigned long max_delay;
897 unsigned long now = jiffies;
901 spin_lock(&br->multicast_lock);
902 if (!netif_running(br->dev) ||
903 (port && port->state == BR_STATE_DISABLED))
906 br_multicast_query_received(br, port, !!iph->saddr);
910 if (skb->len == sizeof(*ih)) {
911 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
918 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
923 ih3 = igmpv3_query_hdr(skb);
927 max_delay = ih3->code ?
928 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
934 mp = br_mdb_ip4_get(br->mdb, group);
938 max_delay *= br->multicast_last_member_count;
940 if (!hlist_unhashed(&mp->mglist) &&
941 (timer_pending(&mp->timer) ?
942 time_after(mp->timer.expires, now + max_delay) :
943 try_to_del_timer_sync(&mp->timer) >= 0))
944 mod_timer(&mp->timer, now + max_delay);
946 for (pp = &mp->ports; (p = *pp); pp = &p->next) {
947 if (timer_pending(&p->timer) ?
948 time_after(p->timer.expires, now + max_delay) :
949 try_to_del_timer_sync(&p->timer) >= 0)
950 mod_timer(&mp->timer, now + max_delay);
954 spin_unlock(&br->multicast_lock);
958 static void br_multicast_leave_group(struct net_bridge *br,
959 struct net_bridge_port *port,
962 struct net_bridge_mdb_htable *mdb;
963 struct net_bridge_mdb_entry *mp;
964 struct net_bridge_port_group *p;
968 spin_lock(&br->multicast_lock);
969 if (!netif_running(br->dev) ||
970 (port && port->state == BR_STATE_DISABLED) ||
971 timer_pending(&br->multicast_querier_timer))
975 mp = br_mdb_ip_get(mdb, group);
980 time = now + br->multicast_last_member_count *
981 br->multicast_last_member_interval;
984 if (!hlist_unhashed(&mp->mglist) &&
985 (timer_pending(&mp->timer) ?
986 time_after(mp->timer.expires, time) :
987 try_to_del_timer_sync(&mp->timer) >= 0)) {
988 mod_timer(&mp->timer, time);
990 mp->queries_sent = 0;
991 mod_timer(&mp->query_timer, now);
997 for (p = mp->ports; p; p = p->next) {
1001 if (!hlist_unhashed(&p->mglist) &&
1002 (timer_pending(&p->timer) ?
1003 time_after(p->timer.expires, time) :
1004 try_to_del_timer_sync(&p->timer) >= 0)) {
1005 mod_timer(&p->timer, time);
1007 p->queries_sent = 0;
1008 mod_timer(&p->query_timer, now);
1015 spin_unlock(&br->multicast_lock);
1018 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1019 struct net_bridge_port *port,
1022 struct br_ip br_group;
1024 if (ipv4_is_local_multicast(group))
1027 br_group.u.ip4 = group;
1028 br_group.proto = htons(ETH_P_IP);
1030 br_multicast_leave_group(br, port, &br_group);
1034 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1035 struct net_bridge_port *port,
1036 struct sk_buff *skb)
1038 struct sk_buff *skb2 = skb;
1045 BR_INPUT_SKB_CB(skb)->igmp = 0;
1046 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1048 /* We treat OOM as packet loss for now. */
1049 if (!pskb_may_pull(skb, sizeof(*iph)))
1054 if (iph->ihl < 5 || iph->version != 4)
1057 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1062 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1065 if (iph->protocol != IPPROTO_IGMP)
1068 len = ntohs(iph->tot_len);
1069 if (skb->len < len || len < ip_hdrlen(skb))
1072 if (skb->len > len) {
1073 skb2 = skb_clone(skb, GFP_ATOMIC);
1077 err = pskb_trim_rcsum(skb2, len);
1082 len -= ip_hdrlen(skb2);
1083 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1084 __skb_pull(skb2, offset);
1085 skb_reset_transport_header(skb2);
1088 if (!pskb_may_pull(skb2, sizeof(*ih)))
1091 switch (skb2->ip_summed) {
1092 case CHECKSUM_COMPLETE:
1093 if (!csum_fold(skb2->csum))
1098 if (skb_checksum_complete(skb2))
1104 BR_INPUT_SKB_CB(skb)->igmp = 1;
1105 ih = igmp_hdr(skb2);
1108 case IGMP_HOST_MEMBERSHIP_REPORT:
1109 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1110 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1111 err = br_ip4_multicast_add_group(br, port, ih->group);
1113 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1114 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1116 case IGMP_HOST_MEMBERSHIP_QUERY:
1117 err = br_ip4_multicast_query(br, port, skb2);
1119 case IGMP_HOST_LEAVE_MESSAGE:
1120 br_ip4_multicast_leave_group(br, port, ih->group);
1125 __skb_push(skb2, offset);
1132 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1133 struct sk_buff *skb)
1135 if (br->multicast_disabled)
1138 switch (skb->protocol) {
1139 case htons(ETH_P_IP):
1140 return br_multicast_ipv4_rcv(br, port, skb);
1146 static void br_multicast_query_expired(unsigned long data)
1148 struct net_bridge *br = (void *)data;
1150 spin_lock(&br->multicast_lock);
1151 if (br->multicast_startup_queries_sent <
1152 br->multicast_startup_query_count)
1153 br->multicast_startup_queries_sent++;
1155 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1157 spin_unlock(&br->multicast_lock);
1160 void br_multicast_init(struct net_bridge *br)
1162 br->hash_elasticity = 4;
1165 br->multicast_router = 1;
1166 br->multicast_last_member_count = 2;
1167 br->multicast_startup_query_count = 2;
1169 br->multicast_last_member_interval = HZ;
1170 br->multicast_query_response_interval = 10 * HZ;
1171 br->multicast_startup_query_interval = 125 * HZ / 4;
1172 br->multicast_query_interval = 125 * HZ;
1173 br->multicast_querier_interval = 255 * HZ;
1174 br->multicast_membership_interval = 260 * HZ;
1176 spin_lock_init(&br->multicast_lock);
1177 setup_timer(&br->multicast_router_timer,
1178 br_multicast_local_router_expired, 0);
1179 setup_timer(&br->multicast_querier_timer,
1180 br_multicast_local_router_expired, 0);
1181 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1185 void br_multicast_open(struct net_bridge *br)
1187 br->multicast_startup_queries_sent = 0;
1189 if (br->multicast_disabled)
1192 mod_timer(&br->multicast_query_timer, jiffies);
1195 void br_multicast_stop(struct net_bridge *br)
1197 struct net_bridge_mdb_htable *mdb;
1198 struct net_bridge_mdb_entry *mp;
1199 struct hlist_node *p, *n;
1203 del_timer_sync(&br->multicast_router_timer);
1204 del_timer_sync(&br->multicast_querier_timer);
1205 del_timer_sync(&br->multicast_query_timer);
1207 spin_lock_bh(&br->multicast_lock);
1215 for (i = 0; i < mdb->max; i++) {
1216 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1218 del_timer(&mp->timer);
1219 del_timer(&mp->query_timer);
1220 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1225 spin_unlock_bh(&br->multicast_lock);
1227 spin_lock_bh(&br->multicast_lock);
1232 call_rcu_bh(&mdb->rcu, br_mdb_free);
1235 spin_unlock_bh(&br->multicast_lock);
1238 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1242 spin_lock_bh(&br->multicast_lock);
1243 if (!netif_running(br->dev))
1249 del_timer(&br->multicast_router_timer);
1252 br->multicast_router = val;
1262 spin_unlock_bh(&br->multicast_lock);
1267 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1269 struct net_bridge *br = p->br;
1272 spin_lock(&br->multicast_lock);
1273 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1280 p->multicast_router = val;
1283 if (val < 2 && !hlist_unhashed(&p->rlist))
1284 hlist_del_init_rcu(&p->rlist);
1289 del_timer(&p->multicast_router_timer);
1294 br_multicast_add_router(br, p);
1303 spin_unlock(&br->multicast_lock);
1308 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1310 struct net_bridge_port *port;
1313 spin_lock(&br->multicast_lock);
1314 if (!netif_running(br->dev))
1318 if (br->multicast_disabled == !val)
1321 br->multicast_disabled = !val;
1322 if (br->multicast_disabled)
1329 br->multicast_disabled = !!val;
1333 err = br_mdb_rehash(&br->mdb, br->mdb->max,
1334 br->hash_elasticity);
1339 br_multicast_open(br);
1340 list_for_each_entry(port, &br->port_list, list) {
1341 if (port->state == BR_STATE_DISABLED ||
1342 port->state == BR_STATE_BLOCKING)
1345 __br_multicast_enable_port(port);
1349 spin_unlock(&br->multicast_lock);
1354 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1359 spin_lock(&br->multicast_lock);
1360 if (!netif_running(br->dev))
1364 if (!is_power_of_2(val))
1366 if (br->mdb && val < br->mdb->size)
1382 err = br_mdb_rehash(&br->mdb, br->hash_max,
1383 br->hash_elasticity);
1389 spin_unlock(&br->multicast_lock);