The padding destination or hop-by-hop option is called Pad1 and not Pad0. See RFC2460 (4.2) or the IANA ipv6-parameters registry: http://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xml Signed-off-by: Eldad Zack <eldad@fogrefinery.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1823 lines
39 KiB
C
1823 lines
39 KiB
C
/*
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* Bridge multicast support.
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*
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* Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/err.h>
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#include <linux/if_ether.h>
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#include <linux/igmp.h>
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#include <linux/jhash.h>
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#include <linux/kernel.h>
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#include <linux/log2.h>
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#include <linux/netdevice.h>
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#include <linux/netfilter_bridge.h>
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#include <linux/random.h>
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#include <linux/rculist.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/timer.h>
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#include <net/ip.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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#include <net/mld.h>
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#include <net/addrconf.h>
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#include <net/ip6_checksum.h>
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#endif
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#include "br_private.h"
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#define mlock_dereference(X, br) \
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rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
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static void br_multicast_start_querier(struct net_bridge *br);
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#if IS_ENABLED(CONFIG_IPV6)
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static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
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{
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if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
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return 1;
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return 0;
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}
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#endif
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static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
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{
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if (a->proto != b->proto)
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return 0;
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switch (a->proto) {
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case htons(ETH_P_IP):
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return a->u.ip4 == b->u.ip4;
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#if IS_ENABLED(CONFIG_IPV6)
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case htons(ETH_P_IPV6):
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return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
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#endif
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}
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return 0;
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}
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static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
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{
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return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
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const struct in6_addr *ip)
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{
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return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
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}
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#endif
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static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
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struct br_ip *ip)
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{
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switch (ip->proto) {
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case htons(ETH_P_IP):
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return __br_ip4_hash(mdb, ip->u.ip4);
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#if IS_ENABLED(CONFIG_IPV6)
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case htons(ETH_P_IPV6):
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return __br_ip6_hash(mdb, &ip->u.ip6);
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#endif
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}
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return 0;
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}
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static struct net_bridge_mdb_entry *__br_mdb_ip_get(
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struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
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{
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struct net_bridge_mdb_entry *mp;
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struct hlist_node *p;
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hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
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if (br_ip_equal(&mp->addr, dst))
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return mp;
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}
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return NULL;
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}
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static struct net_bridge_mdb_entry *br_mdb_ip_get(
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struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
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{
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if (!mdb)
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return NULL;
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return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
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}
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static struct net_bridge_mdb_entry *br_mdb_ip4_get(
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struct net_bridge_mdb_htable *mdb, __be32 dst)
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{
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struct br_ip br_dst;
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br_dst.u.ip4 = dst;
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br_dst.proto = htons(ETH_P_IP);
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return br_mdb_ip_get(mdb, &br_dst);
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static struct net_bridge_mdb_entry *br_mdb_ip6_get(
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struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
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{
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struct br_ip br_dst;
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br_dst.u.ip6 = *dst;
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br_dst.proto = htons(ETH_P_IPV6);
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return br_mdb_ip_get(mdb, &br_dst);
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}
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#endif
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struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
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struct sk_buff *skb)
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{
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struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
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struct br_ip ip;
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if (br->multicast_disabled)
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return NULL;
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if (BR_INPUT_SKB_CB(skb)->igmp)
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return NULL;
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ip.proto = skb->protocol;
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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ip.u.ip4 = ip_hdr(skb)->daddr;
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case htons(ETH_P_IPV6):
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ip.u.ip6 = ipv6_hdr(skb)->daddr;
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break;
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#endif
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default:
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return NULL;
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}
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return br_mdb_ip_get(mdb, &ip);
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}
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static void br_mdb_free(struct rcu_head *head)
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{
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struct net_bridge_mdb_htable *mdb =
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container_of(head, struct net_bridge_mdb_htable, rcu);
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struct net_bridge_mdb_htable *old = mdb->old;
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mdb->old = NULL;
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kfree(old->mhash);
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kfree(old);
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}
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static int br_mdb_copy(struct net_bridge_mdb_htable *new,
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struct net_bridge_mdb_htable *old,
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int elasticity)
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{
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struct net_bridge_mdb_entry *mp;
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struct hlist_node *p;
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int maxlen;
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int len;
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int i;
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for (i = 0; i < old->max; i++)
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hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
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hlist_add_head(&mp->hlist[new->ver],
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&new->mhash[br_ip_hash(new, &mp->addr)]);
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if (!elasticity)
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return 0;
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maxlen = 0;
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for (i = 0; i < new->max; i++) {
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len = 0;
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hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
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len++;
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if (len > maxlen)
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maxlen = len;
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}
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return maxlen > elasticity ? -EINVAL : 0;
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}
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static void br_multicast_free_pg(struct rcu_head *head)
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{
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struct net_bridge_port_group *p =
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container_of(head, struct net_bridge_port_group, rcu);
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kfree(p);
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}
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static void br_multicast_free_group(struct rcu_head *head)
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{
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struct net_bridge_mdb_entry *mp =
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container_of(head, struct net_bridge_mdb_entry, rcu);
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kfree(mp);
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}
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static void br_multicast_group_expired(unsigned long data)
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{
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struct net_bridge_mdb_entry *mp = (void *)data;
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struct net_bridge *br = mp->br;
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struct net_bridge_mdb_htable *mdb;
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spin_lock(&br->multicast_lock);
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if (!netif_running(br->dev) || timer_pending(&mp->timer))
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goto out;
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mp->mglist = false;
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if (mp->ports)
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goto out;
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mdb = mlock_dereference(br->mdb, br);
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hlist_del_rcu(&mp->hlist[mdb->ver]);
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mdb->size--;
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call_rcu_bh(&mp->rcu, br_multicast_free_group);
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out:
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spin_unlock(&br->multicast_lock);
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}
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static void br_multicast_del_pg(struct net_bridge *br,
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struct net_bridge_port_group *pg)
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{
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struct net_bridge_mdb_htable *mdb;
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struct net_bridge_mdb_entry *mp;
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struct net_bridge_port_group *p;
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struct net_bridge_port_group __rcu **pp;
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mdb = mlock_dereference(br->mdb, br);
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mp = br_mdb_ip_get(mdb, &pg->addr);
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if (WARN_ON(!mp))
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return;
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for (pp = &mp->ports;
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(p = mlock_dereference(*pp, br)) != NULL;
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pp = &p->next) {
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if (p != pg)
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continue;
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rcu_assign_pointer(*pp, p->next);
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hlist_del_init(&p->mglist);
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del_timer(&p->timer);
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call_rcu_bh(&p->rcu, br_multicast_free_pg);
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if (!mp->ports && !mp->mglist &&
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netif_running(br->dev))
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mod_timer(&mp->timer, jiffies);
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return;
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}
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WARN_ON(1);
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}
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static void br_multicast_port_group_expired(unsigned long data)
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{
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struct net_bridge_port_group *pg = (void *)data;
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struct net_bridge *br = pg->port->br;
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spin_lock(&br->multicast_lock);
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if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
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hlist_unhashed(&pg->mglist))
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goto out;
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br_multicast_del_pg(br, pg);
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out:
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spin_unlock(&br->multicast_lock);
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}
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static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
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int elasticity)
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{
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struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
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struct net_bridge_mdb_htable *mdb;
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int err;
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mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
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if (!mdb)
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return -ENOMEM;
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mdb->max = max;
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mdb->old = old;
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mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
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if (!mdb->mhash) {
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kfree(mdb);
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return -ENOMEM;
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}
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mdb->size = old ? old->size : 0;
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mdb->ver = old ? old->ver ^ 1 : 0;
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if (!old || elasticity)
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get_random_bytes(&mdb->secret, sizeof(mdb->secret));
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else
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mdb->secret = old->secret;
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if (!old)
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goto out;
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err = br_mdb_copy(mdb, old, elasticity);
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if (err) {
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kfree(mdb->mhash);
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kfree(mdb);
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return err;
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}
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call_rcu_bh(&mdb->rcu, br_mdb_free);
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out:
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rcu_assign_pointer(*mdbp, mdb);
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return 0;
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}
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static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
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__be32 group)
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{
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struct sk_buff *skb;
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struct igmphdr *ih;
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struct ethhdr *eth;
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struct iphdr *iph;
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skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
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sizeof(*ih) + 4);
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if (!skb)
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goto out;
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skb->protocol = htons(ETH_P_IP);
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skb_reset_mac_header(skb);
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eth = eth_hdr(skb);
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memcpy(eth->h_source, br->dev->dev_addr, 6);
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eth->h_dest[0] = 1;
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eth->h_dest[1] = 0;
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eth->h_dest[2] = 0x5e;
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eth->h_dest[3] = 0;
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eth->h_dest[4] = 0;
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eth->h_dest[5] = 1;
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eth->h_proto = htons(ETH_P_IP);
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skb_put(skb, sizeof(*eth));
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skb_set_network_header(skb, skb->len);
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iph = ip_hdr(skb);
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iph->version = 4;
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iph->ihl = 6;
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iph->tos = 0xc0;
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iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
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iph->id = 0;
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iph->frag_off = htons(IP_DF);
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iph->ttl = 1;
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iph->protocol = IPPROTO_IGMP;
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iph->saddr = 0;
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iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
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((u8 *)&iph[1])[0] = IPOPT_RA;
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((u8 *)&iph[1])[1] = 4;
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((u8 *)&iph[1])[2] = 0;
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((u8 *)&iph[1])[3] = 0;
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ip_send_check(iph);
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skb_put(skb, 24);
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skb_set_transport_header(skb, skb->len);
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ih = igmp_hdr(skb);
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ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
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ih->code = (group ? br->multicast_last_member_interval :
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br->multicast_query_response_interval) /
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(HZ / IGMP_TIMER_SCALE);
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ih->group = group;
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ih->csum = 0;
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ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
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skb_put(skb, sizeof(*ih));
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__skb_pull(skb, sizeof(*eth));
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out:
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return skb;
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}
|
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|
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#if IS_ENABLED(CONFIG_IPV6)
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static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
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const struct in6_addr *group)
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{
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struct sk_buff *skb;
|
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struct ipv6hdr *ip6h;
|
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struct mld_msg *mldq;
|
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struct ethhdr *eth;
|
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u8 *hopopt;
|
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unsigned long interval;
|
|
|
|
skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
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8 + sizeof(*mldq));
|
|
if (!skb)
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goto out;
|
|
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
|
|
/* Ethernet header */
|
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skb_reset_mac_header(skb);
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eth = eth_hdr(skb);
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|
|
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memcpy(eth->h_source, br->dev->dev_addr, 6);
|
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eth->h_proto = htons(ETH_P_IPV6);
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skb_put(skb, sizeof(*eth));
|
|
|
|
/* IPv6 header + HbH option */
|
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skb_set_network_header(skb, skb->len);
|
|
ip6h = ipv6_hdr(skb);
|
|
|
|
*(__force __be32 *)ip6h = htonl(0x60000000);
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|
ip6h->payload_len = htons(8 + sizeof(*mldq));
|
|
ip6h->nexthdr = IPPROTO_HOPOPTS;
|
|
ip6h->hop_limit = 1;
|
|
ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
|
|
if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
|
|
&ip6h->saddr)) {
|
|
kfree_skb(skb);
|
|
return NULL;
|
|
}
|
|
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
|
|
|
|
hopopt = (u8 *)(ip6h + 1);
|
|
hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
|
|
hopopt[1] = 0; /* length of HbH */
|
|
hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
|
|
hopopt[3] = 2; /* Length of RA Option */
|
|
hopopt[4] = 0; /* Type = 0x0000 (MLD) */
|
|
hopopt[5] = 0;
|
|
hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
|
|
hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
|
|
|
|
skb_put(skb, sizeof(*ip6h) + 8);
|
|
|
|
/* ICMPv6 */
|
|
skb_set_transport_header(skb, skb->len);
|
|
mldq = (struct mld_msg *) icmp6_hdr(skb);
|
|
|
|
interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
|
|
br->multicast_query_response_interval;
|
|
|
|
mldq->mld_type = ICMPV6_MGM_QUERY;
|
|
mldq->mld_code = 0;
|
|
mldq->mld_cksum = 0;
|
|
mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
|
|
mldq->mld_reserved = 0;
|
|
mldq->mld_mca = *group;
|
|
|
|
/* checksum */
|
|
mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
|
|
sizeof(*mldq), IPPROTO_ICMPV6,
|
|
csum_partial(mldq,
|
|
sizeof(*mldq), 0));
|
|
skb_put(skb, sizeof(*mldq));
|
|
|
|
__skb_pull(skb, sizeof(*eth));
|
|
|
|
out:
|
|
return skb;
|
|
}
|
|
#endif
|
|
|
|
static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
|
|
struct br_ip *addr)
|
|
{
|
|
switch (addr->proto) {
|
|
case htons(ETH_P_IP):
|
|
return br_ip4_multicast_alloc_query(br, addr->u.ip4);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case htons(ETH_P_IPV6):
|
|
return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
|
|
#endif
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct net_bridge_mdb_entry *br_multicast_get_group(
|
|
struct net_bridge *br, struct net_bridge_port *port,
|
|
struct br_ip *group, int hash)
|
|
{
|
|
struct net_bridge_mdb_htable *mdb;
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct hlist_node *p;
|
|
unsigned int count = 0;
|
|
unsigned int max;
|
|
int elasticity;
|
|
int err;
|
|
|
|
mdb = rcu_dereference_protected(br->mdb, 1);
|
|
hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
|
|
count++;
|
|
if (unlikely(br_ip_equal(group, &mp->addr)))
|
|
return mp;
|
|
}
|
|
|
|
elasticity = 0;
|
|
max = mdb->max;
|
|
|
|
if (unlikely(count > br->hash_elasticity && count)) {
|
|
if (net_ratelimit())
|
|
br_info(br, "Multicast hash table "
|
|
"chain limit reached: %s\n",
|
|
port ? port->dev->name : br->dev->name);
|
|
|
|
elasticity = br->hash_elasticity;
|
|
}
|
|
|
|
if (mdb->size >= max) {
|
|
max *= 2;
|
|
if (unlikely(max >= br->hash_max)) {
|
|
br_warn(br, "Multicast hash table maximum "
|
|
"reached, disabling snooping: %s, %d\n",
|
|
port ? port->dev->name : br->dev->name, max);
|
|
err = -E2BIG;
|
|
disable:
|
|
br->multicast_disabled = 1;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (max > mdb->max || elasticity) {
|
|
if (mdb->old) {
|
|
if (net_ratelimit())
|
|
br_info(br, "Multicast hash table "
|
|
"on fire: %s\n",
|
|
port ? port->dev->name : br->dev->name);
|
|
err = -EEXIST;
|
|
goto err;
|
|
}
|
|
|
|
err = br_mdb_rehash(&br->mdb, max, elasticity);
|
|
if (err) {
|
|
br_warn(br, "Cannot rehash multicast "
|
|
"hash table, disabling snooping: %s, %d, %d\n",
|
|
port ? port->dev->name : br->dev->name,
|
|
mdb->size, err);
|
|
goto disable;
|
|
}
|
|
|
|
err = -EAGAIN;
|
|
goto err;
|
|
}
|
|
|
|
return NULL;
|
|
|
|
err:
|
|
mp = ERR_PTR(err);
|
|
return mp;
|
|
}
|
|
|
|
static struct net_bridge_mdb_entry *br_multicast_new_group(
|
|
struct net_bridge *br, struct net_bridge_port *port,
|
|
struct br_ip *group)
|
|
{
|
|
struct net_bridge_mdb_htable *mdb;
|
|
struct net_bridge_mdb_entry *mp;
|
|
int hash;
|
|
int err;
|
|
|
|
mdb = rcu_dereference_protected(br->mdb, 1);
|
|
if (!mdb) {
|
|
err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
goto rehash;
|
|
}
|
|
|
|
hash = br_ip_hash(mdb, group);
|
|
mp = br_multicast_get_group(br, port, group, hash);
|
|
switch (PTR_ERR(mp)) {
|
|
case 0:
|
|
break;
|
|
|
|
case -EAGAIN:
|
|
rehash:
|
|
mdb = rcu_dereference_protected(br->mdb, 1);
|
|
hash = br_ip_hash(mdb, group);
|
|
break;
|
|
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
|
|
if (unlikely(!mp))
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
mp->br = br;
|
|
mp->addr = *group;
|
|
setup_timer(&mp->timer, br_multicast_group_expired,
|
|
(unsigned long)mp);
|
|
|
|
hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
|
|
mdb->size++;
|
|
|
|
out:
|
|
return mp;
|
|
}
|
|
|
|
static int br_multicast_add_group(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct br_ip *group)
|
|
{
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct net_bridge_port_group *p;
|
|
struct net_bridge_port_group __rcu **pp;
|
|
unsigned long now = jiffies;
|
|
int err;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev) ||
|
|
(port && port->state == BR_STATE_DISABLED))
|
|
goto out;
|
|
|
|
mp = br_multicast_new_group(br, port, group);
|
|
err = PTR_ERR(mp);
|
|
if (IS_ERR(mp))
|
|
goto err;
|
|
|
|
if (!port) {
|
|
mp->mglist = true;
|
|
mod_timer(&mp->timer, now + br->multicast_membership_interval);
|
|
goto out;
|
|
}
|
|
|
|
for (pp = &mp->ports;
|
|
(p = mlock_dereference(*pp, br)) != NULL;
|
|
pp = &p->next) {
|
|
if (p->port == port)
|
|
goto found;
|
|
if ((unsigned long)p->port < (unsigned long)port)
|
|
break;
|
|
}
|
|
|
|
p = kzalloc(sizeof(*p), GFP_ATOMIC);
|
|
err = -ENOMEM;
|
|
if (unlikely(!p))
|
|
goto err;
|
|
|
|
p->addr = *group;
|
|
p->port = port;
|
|
p->next = *pp;
|
|
hlist_add_head(&p->mglist, &port->mglist);
|
|
setup_timer(&p->timer, br_multicast_port_group_expired,
|
|
(unsigned long)p);
|
|
|
|
rcu_assign_pointer(*pp, p);
|
|
|
|
found:
|
|
mod_timer(&p->timer, now + br->multicast_membership_interval);
|
|
out:
|
|
err = 0;
|
|
|
|
err:
|
|
spin_unlock(&br->multicast_lock);
|
|
return err;
|
|
}
|
|
|
|
static int br_ip4_multicast_add_group(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
__be32 group)
|
|
{
|
|
struct br_ip br_group;
|
|
|
|
if (ipv4_is_local_multicast(group))
|
|
return 0;
|
|
|
|
br_group.u.ip4 = group;
|
|
br_group.proto = htons(ETH_P_IP);
|
|
|
|
return br_multicast_add_group(br, port, &br_group);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static int br_ip6_multicast_add_group(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
const struct in6_addr *group)
|
|
{
|
|
struct br_ip br_group;
|
|
|
|
if (!ipv6_is_transient_multicast(group))
|
|
return 0;
|
|
|
|
br_group.u.ip6 = *group;
|
|
br_group.proto = htons(ETH_P_IPV6);
|
|
|
|
return br_multicast_add_group(br, port, &br_group);
|
|
}
|
|
#endif
|
|
|
|
static void br_multicast_router_expired(unsigned long data)
|
|
{
|
|
struct net_bridge_port *port = (void *)data;
|
|
struct net_bridge *br = port->br;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (port->multicast_router != 1 ||
|
|
timer_pending(&port->multicast_router_timer) ||
|
|
hlist_unhashed(&port->rlist))
|
|
goto out;
|
|
|
|
hlist_del_init_rcu(&port->rlist);
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
static void br_multicast_local_router_expired(unsigned long data)
|
|
{
|
|
}
|
|
|
|
static void br_multicast_querier_expired(unsigned long data)
|
|
{
|
|
struct net_bridge *br = (void *)data;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev) || br->multicast_disabled)
|
|
goto out;
|
|
|
|
br_multicast_start_querier(br);
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
static void __br_multicast_send_query(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct br_ip *ip)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
skb = br_multicast_alloc_query(br, ip);
|
|
if (!skb)
|
|
return;
|
|
|
|
if (port) {
|
|
__skb_push(skb, sizeof(struct ethhdr));
|
|
skb->dev = port->dev;
|
|
NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
|
|
dev_queue_xmit);
|
|
} else
|
|
netif_rx(skb);
|
|
}
|
|
|
|
static void br_multicast_send_query(struct net_bridge *br,
|
|
struct net_bridge_port *port, u32 sent)
|
|
{
|
|
unsigned long time;
|
|
struct br_ip br_group;
|
|
|
|
if (!netif_running(br->dev) || br->multicast_disabled ||
|
|
!br->multicast_querier ||
|
|
timer_pending(&br->multicast_querier_timer))
|
|
return;
|
|
|
|
memset(&br_group.u, 0, sizeof(br_group.u));
|
|
|
|
br_group.proto = htons(ETH_P_IP);
|
|
__br_multicast_send_query(br, port, &br_group);
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
br_group.proto = htons(ETH_P_IPV6);
|
|
__br_multicast_send_query(br, port, &br_group);
|
|
#endif
|
|
|
|
time = jiffies;
|
|
time += sent < br->multicast_startup_query_count ?
|
|
br->multicast_startup_query_interval :
|
|
br->multicast_query_interval;
|
|
mod_timer(port ? &port->multicast_query_timer :
|
|
&br->multicast_query_timer, time);
|
|
}
|
|
|
|
static void br_multicast_port_query_expired(unsigned long data)
|
|
{
|
|
struct net_bridge_port *port = (void *)data;
|
|
struct net_bridge *br = port->br;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (port->state == BR_STATE_DISABLED ||
|
|
port->state == BR_STATE_BLOCKING)
|
|
goto out;
|
|
|
|
if (port->multicast_startup_queries_sent <
|
|
br->multicast_startup_query_count)
|
|
port->multicast_startup_queries_sent++;
|
|
|
|
br_multicast_send_query(port->br, port,
|
|
port->multicast_startup_queries_sent);
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
void br_multicast_add_port(struct net_bridge_port *port)
|
|
{
|
|
port->multicast_router = 1;
|
|
|
|
setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
|
|
(unsigned long)port);
|
|
setup_timer(&port->multicast_query_timer,
|
|
br_multicast_port_query_expired, (unsigned long)port);
|
|
}
|
|
|
|
void br_multicast_del_port(struct net_bridge_port *port)
|
|
{
|
|
del_timer_sync(&port->multicast_router_timer);
|
|
}
|
|
|
|
static void __br_multicast_enable_port(struct net_bridge_port *port)
|
|
{
|
|
port->multicast_startup_queries_sent = 0;
|
|
|
|
if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
|
|
del_timer(&port->multicast_query_timer))
|
|
mod_timer(&port->multicast_query_timer, jiffies);
|
|
}
|
|
|
|
void br_multicast_enable_port(struct net_bridge_port *port)
|
|
{
|
|
struct net_bridge *br = port->br;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (br->multicast_disabled || !netif_running(br->dev))
|
|
goto out;
|
|
|
|
__br_multicast_enable_port(port);
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
void br_multicast_disable_port(struct net_bridge_port *port)
|
|
{
|
|
struct net_bridge *br = port->br;
|
|
struct net_bridge_port_group *pg;
|
|
struct hlist_node *p, *n;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
|
|
br_multicast_del_pg(br, pg);
|
|
|
|
if (!hlist_unhashed(&port->rlist))
|
|
hlist_del_init_rcu(&port->rlist);
|
|
del_timer(&port->multicast_router_timer);
|
|
del_timer(&port->multicast_query_timer);
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct igmpv3_report *ih;
|
|
struct igmpv3_grec *grec;
|
|
int i;
|
|
int len;
|
|
int num;
|
|
int type;
|
|
int err = 0;
|
|
__be32 group;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*ih)))
|
|
return -EINVAL;
|
|
|
|
ih = igmpv3_report_hdr(skb);
|
|
num = ntohs(ih->ngrec);
|
|
len = sizeof(*ih);
|
|
|
|
for (i = 0; i < num; i++) {
|
|
len += sizeof(*grec);
|
|
if (!pskb_may_pull(skb, len))
|
|
return -EINVAL;
|
|
|
|
grec = (void *)(skb->data + len - sizeof(*grec));
|
|
group = grec->grec_mca;
|
|
type = grec->grec_type;
|
|
|
|
len += ntohs(grec->grec_nsrcs) * 4;
|
|
if (!pskb_may_pull(skb, len))
|
|
return -EINVAL;
|
|
|
|
/* We treat this as an IGMPv2 report for now. */
|
|
switch (type) {
|
|
case IGMPV3_MODE_IS_INCLUDE:
|
|
case IGMPV3_MODE_IS_EXCLUDE:
|
|
case IGMPV3_CHANGE_TO_INCLUDE:
|
|
case IGMPV3_CHANGE_TO_EXCLUDE:
|
|
case IGMPV3_ALLOW_NEW_SOURCES:
|
|
case IGMPV3_BLOCK_OLD_SOURCES:
|
|
break;
|
|
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
err = br_ip4_multicast_add_group(br, port, group);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static int br_ip6_multicast_mld2_report(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct icmp6hdr *icmp6h;
|
|
struct mld2_grec *grec;
|
|
int i;
|
|
int len;
|
|
int num;
|
|
int err = 0;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*icmp6h)))
|
|
return -EINVAL;
|
|
|
|
icmp6h = icmp6_hdr(skb);
|
|
num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
|
|
len = sizeof(*icmp6h);
|
|
|
|
for (i = 0; i < num; i++) {
|
|
__be16 *nsrcs, _nsrcs;
|
|
|
|
nsrcs = skb_header_pointer(skb,
|
|
len + offsetof(struct mld2_grec,
|
|
grec_nsrcs),
|
|
sizeof(_nsrcs), &_nsrcs);
|
|
if (!nsrcs)
|
|
return -EINVAL;
|
|
|
|
if (!pskb_may_pull(skb,
|
|
len + sizeof(*grec) +
|
|
sizeof(struct in6_addr) * ntohs(*nsrcs)))
|
|
return -EINVAL;
|
|
|
|
grec = (struct mld2_grec *)(skb->data + len);
|
|
len += sizeof(*grec) +
|
|
sizeof(struct in6_addr) * ntohs(*nsrcs);
|
|
|
|
/* We treat these as MLDv1 reports for now. */
|
|
switch (grec->grec_type) {
|
|
case MLD2_MODE_IS_INCLUDE:
|
|
case MLD2_MODE_IS_EXCLUDE:
|
|
case MLD2_CHANGE_TO_INCLUDE:
|
|
case MLD2_CHANGE_TO_EXCLUDE:
|
|
case MLD2_ALLOW_NEW_SOURCES:
|
|
case MLD2_BLOCK_OLD_SOURCES:
|
|
break;
|
|
|
|
default:
|
|
continue;
|
|
}
|
|
|
|
err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
|
|
if (!err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Add port to rotuer_list
|
|
* list is maintained ordered by pointer value
|
|
* and locked by br->multicast_lock and RCU
|
|
*/
|
|
static void br_multicast_add_router(struct net_bridge *br,
|
|
struct net_bridge_port *port)
|
|
{
|
|
struct net_bridge_port *p;
|
|
struct hlist_node *n, *slot = NULL;
|
|
|
|
hlist_for_each_entry(p, n, &br->router_list, rlist) {
|
|
if ((unsigned long) port >= (unsigned long) p)
|
|
break;
|
|
slot = n;
|
|
}
|
|
|
|
if (slot)
|
|
hlist_add_after_rcu(slot, &port->rlist);
|
|
else
|
|
hlist_add_head_rcu(&port->rlist, &br->router_list);
|
|
}
|
|
|
|
static void br_multicast_mark_router(struct net_bridge *br,
|
|
struct net_bridge_port *port)
|
|
{
|
|
unsigned long now = jiffies;
|
|
|
|
if (!port) {
|
|
if (br->multicast_router == 1)
|
|
mod_timer(&br->multicast_router_timer,
|
|
now + br->multicast_querier_interval);
|
|
return;
|
|
}
|
|
|
|
if (port->multicast_router != 1)
|
|
return;
|
|
|
|
if (!hlist_unhashed(&port->rlist))
|
|
goto timer;
|
|
|
|
br_multicast_add_router(br, port);
|
|
|
|
timer:
|
|
mod_timer(&port->multicast_router_timer,
|
|
now + br->multicast_querier_interval);
|
|
}
|
|
|
|
static void br_multicast_query_received(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
int saddr)
|
|
{
|
|
if (saddr)
|
|
mod_timer(&br->multicast_querier_timer,
|
|
jiffies + br->multicast_querier_interval);
|
|
else if (timer_pending(&br->multicast_querier_timer))
|
|
return;
|
|
|
|
br_multicast_mark_router(br, port);
|
|
}
|
|
|
|
static int br_ip4_multicast_query(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
struct igmphdr *ih = igmp_hdr(skb);
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct igmpv3_query *ih3;
|
|
struct net_bridge_port_group *p;
|
|
struct net_bridge_port_group __rcu **pp;
|
|
unsigned long max_delay;
|
|
unsigned long now = jiffies;
|
|
__be32 group;
|
|
int err = 0;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev) ||
|
|
(port && port->state == BR_STATE_DISABLED))
|
|
goto out;
|
|
|
|
br_multicast_query_received(br, port, !!iph->saddr);
|
|
|
|
group = ih->group;
|
|
|
|
if (skb->len == sizeof(*ih)) {
|
|
max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
|
|
|
|
if (!max_delay) {
|
|
max_delay = 10 * HZ;
|
|
group = 0;
|
|
}
|
|
} else {
|
|
if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ih3 = igmpv3_query_hdr(skb);
|
|
if (ih3->nsrcs)
|
|
goto out;
|
|
|
|
max_delay = ih3->code ?
|
|
IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
|
|
}
|
|
|
|
if (!group)
|
|
goto out;
|
|
|
|
mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
|
|
if (!mp)
|
|
goto out;
|
|
|
|
max_delay *= br->multicast_last_member_count;
|
|
|
|
if (mp->mglist &&
|
|
(timer_pending(&mp->timer) ?
|
|
time_after(mp->timer.expires, now + max_delay) :
|
|
try_to_del_timer_sync(&mp->timer) >= 0))
|
|
mod_timer(&mp->timer, now + max_delay);
|
|
|
|
for (pp = &mp->ports;
|
|
(p = mlock_dereference(*pp, br)) != NULL;
|
|
pp = &p->next) {
|
|
if (timer_pending(&p->timer) ?
|
|
time_after(p->timer.expires, now + max_delay) :
|
|
try_to_del_timer_sync(&p->timer) >= 0)
|
|
mod_timer(&p->timer, now + max_delay);
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
return err;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static int br_ip6_multicast_query(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
|
|
struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct mld2_query *mld2q;
|
|
struct net_bridge_port_group *p;
|
|
struct net_bridge_port_group __rcu **pp;
|
|
unsigned long max_delay;
|
|
unsigned long now = jiffies;
|
|
const struct in6_addr *group = NULL;
|
|
int err = 0;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev) ||
|
|
(port && port->state == BR_STATE_DISABLED))
|
|
goto out;
|
|
|
|
br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
|
|
|
|
if (skb->len == sizeof(*mld)) {
|
|
if (!pskb_may_pull(skb, sizeof(*mld))) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
mld = (struct mld_msg *) icmp6_hdr(skb);
|
|
max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
|
|
if (max_delay)
|
|
group = &mld->mld_mca;
|
|
} else if (skb->len >= sizeof(*mld2q)) {
|
|
if (!pskb_may_pull(skb, sizeof(*mld2q))) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
mld2q = (struct mld2_query *)icmp6_hdr(skb);
|
|
if (!mld2q->mld2q_nsrcs)
|
|
group = &mld2q->mld2q_mca;
|
|
max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
|
|
}
|
|
|
|
if (!group)
|
|
goto out;
|
|
|
|
mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
|
|
if (!mp)
|
|
goto out;
|
|
|
|
max_delay *= br->multicast_last_member_count;
|
|
if (mp->mglist &&
|
|
(timer_pending(&mp->timer) ?
|
|
time_after(mp->timer.expires, now + max_delay) :
|
|
try_to_del_timer_sync(&mp->timer) >= 0))
|
|
mod_timer(&mp->timer, now + max_delay);
|
|
|
|
for (pp = &mp->ports;
|
|
(p = mlock_dereference(*pp, br)) != NULL;
|
|
pp = &p->next) {
|
|
if (timer_pending(&p->timer) ?
|
|
time_after(p->timer.expires, now + max_delay) :
|
|
try_to_del_timer_sync(&p->timer) >= 0)
|
|
mod_timer(&p->timer, now + max_delay);
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
static void br_multicast_leave_group(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct br_ip *group)
|
|
{
|
|
struct net_bridge_mdb_htable *mdb;
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct net_bridge_port_group *p;
|
|
unsigned long now;
|
|
unsigned long time;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev) ||
|
|
(port && port->state == BR_STATE_DISABLED) ||
|
|
timer_pending(&br->multicast_querier_timer))
|
|
goto out;
|
|
|
|
mdb = mlock_dereference(br->mdb, br);
|
|
mp = br_mdb_ip_get(mdb, group);
|
|
if (!mp)
|
|
goto out;
|
|
|
|
now = jiffies;
|
|
time = now + br->multicast_last_member_count *
|
|
br->multicast_last_member_interval;
|
|
|
|
if (!port) {
|
|
if (mp->mglist &&
|
|
(timer_pending(&mp->timer) ?
|
|
time_after(mp->timer.expires, time) :
|
|
try_to_del_timer_sync(&mp->timer) >= 0)) {
|
|
mod_timer(&mp->timer, time);
|
|
}
|
|
|
|
goto out;
|
|
}
|
|
|
|
for (p = mlock_dereference(mp->ports, br);
|
|
p != NULL;
|
|
p = mlock_dereference(p->next, br)) {
|
|
if (p->port != port)
|
|
continue;
|
|
|
|
if (!hlist_unhashed(&p->mglist) &&
|
|
(timer_pending(&p->timer) ?
|
|
time_after(p->timer.expires, time) :
|
|
try_to_del_timer_sync(&p->timer) >= 0)) {
|
|
mod_timer(&p->timer, time);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
static void br_ip4_multicast_leave_group(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
__be32 group)
|
|
{
|
|
struct br_ip br_group;
|
|
|
|
if (ipv4_is_local_multicast(group))
|
|
return;
|
|
|
|
br_group.u.ip4 = group;
|
|
br_group.proto = htons(ETH_P_IP);
|
|
|
|
br_multicast_leave_group(br, port, &br_group);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static void br_ip6_multicast_leave_group(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
const struct in6_addr *group)
|
|
{
|
|
struct br_ip br_group;
|
|
|
|
if (!ipv6_is_transient_multicast(group))
|
|
return;
|
|
|
|
br_group.u.ip6 = *group;
|
|
br_group.proto = htons(ETH_P_IPV6);
|
|
|
|
br_multicast_leave_group(br, port, &br_group);
|
|
}
|
|
#endif
|
|
|
|
static int br_multicast_ipv4_rcv(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *skb2 = skb;
|
|
const struct iphdr *iph;
|
|
struct igmphdr *ih;
|
|
unsigned int len;
|
|
unsigned int offset;
|
|
int err;
|
|
|
|
/* We treat OOM as packet loss for now. */
|
|
if (!pskb_may_pull(skb, sizeof(*iph)))
|
|
return -EINVAL;
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
if (iph->ihl < 5 || iph->version != 4)
|
|
return -EINVAL;
|
|
|
|
if (!pskb_may_pull(skb, ip_hdrlen(skb)))
|
|
return -EINVAL;
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
|
|
return -EINVAL;
|
|
|
|
if (iph->protocol != IPPROTO_IGMP) {
|
|
if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
|
|
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
|
|
return 0;
|
|
}
|
|
|
|
len = ntohs(iph->tot_len);
|
|
if (skb->len < len || len < ip_hdrlen(skb))
|
|
return -EINVAL;
|
|
|
|
if (skb->len > len) {
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
err = pskb_trim_rcsum(skb2, len);
|
|
if (err)
|
|
goto err_out;
|
|
}
|
|
|
|
len -= ip_hdrlen(skb2);
|
|
offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
|
|
__skb_pull(skb2, offset);
|
|
skb_reset_transport_header(skb2);
|
|
|
|
err = -EINVAL;
|
|
if (!pskb_may_pull(skb2, sizeof(*ih)))
|
|
goto out;
|
|
|
|
switch (skb2->ip_summed) {
|
|
case CHECKSUM_COMPLETE:
|
|
if (!csum_fold(skb2->csum))
|
|
break;
|
|
/* fall through */
|
|
case CHECKSUM_NONE:
|
|
skb2->csum = 0;
|
|
if (skb_checksum_complete(skb2))
|
|
goto out;
|
|
}
|
|
|
|
err = 0;
|
|
|
|
BR_INPUT_SKB_CB(skb)->igmp = 1;
|
|
ih = igmp_hdr(skb2);
|
|
|
|
switch (ih->type) {
|
|
case IGMP_HOST_MEMBERSHIP_REPORT:
|
|
case IGMPV2_HOST_MEMBERSHIP_REPORT:
|
|
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
|
|
err = br_ip4_multicast_add_group(br, port, ih->group);
|
|
break;
|
|
case IGMPV3_HOST_MEMBERSHIP_REPORT:
|
|
err = br_ip4_multicast_igmp3_report(br, port, skb2);
|
|
break;
|
|
case IGMP_HOST_MEMBERSHIP_QUERY:
|
|
err = br_ip4_multicast_query(br, port, skb2);
|
|
break;
|
|
case IGMP_HOST_LEAVE_MESSAGE:
|
|
br_ip4_multicast_leave_group(br, port, ih->group);
|
|
break;
|
|
}
|
|
|
|
out:
|
|
__skb_push(skb2, offset);
|
|
err_out:
|
|
if (skb2 != skb)
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static int br_multicast_ipv6_rcv(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *skb2;
|
|
const struct ipv6hdr *ip6h;
|
|
u8 icmp6_type;
|
|
u8 nexthdr;
|
|
__be16 frag_off;
|
|
unsigned int len;
|
|
int offset;
|
|
int err;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*ip6h)))
|
|
return -EINVAL;
|
|
|
|
ip6h = ipv6_hdr(skb);
|
|
|
|
/*
|
|
* We're interested in MLD messages only.
|
|
* - Version is 6
|
|
* - MLD has always Router Alert hop-by-hop option
|
|
* - But we do not support jumbrograms.
|
|
*/
|
|
if (ip6h->version != 6 ||
|
|
ip6h->nexthdr != IPPROTO_HOPOPTS ||
|
|
ip6h->payload_len == 0)
|
|
return 0;
|
|
|
|
len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
|
|
if (skb->len < len)
|
|
return -EINVAL;
|
|
|
|
nexthdr = ip6h->nexthdr;
|
|
offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
|
|
|
|
if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
|
|
return 0;
|
|
|
|
/* Okay, we found ICMPv6 header */
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb2)
|
|
return -ENOMEM;
|
|
|
|
err = -EINVAL;
|
|
if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
|
|
goto out;
|
|
|
|
len -= offset - skb_network_offset(skb2);
|
|
|
|
__skb_pull(skb2, offset);
|
|
skb_reset_transport_header(skb2);
|
|
skb_postpull_rcsum(skb2, skb_network_header(skb2),
|
|
skb_network_header_len(skb2));
|
|
|
|
icmp6_type = icmp6_hdr(skb2)->icmp6_type;
|
|
|
|
switch (icmp6_type) {
|
|
case ICMPV6_MGM_QUERY:
|
|
case ICMPV6_MGM_REPORT:
|
|
case ICMPV6_MGM_REDUCTION:
|
|
case ICMPV6_MLD2_REPORT:
|
|
break;
|
|
default:
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
/* Okay, we found MLD message. Check further. */
|
|
if (skb2->len > len) {
|
|
err = pskb_trim_rcsum(skb2, len);
|
|
if (err)
|
|
goto out;
|
|
err = -EINVAL;
|
|
}
|
|
|
|
ip6h = ipv6_hdr(skb2);
|
|
|
|
switch (skb2->ip_summed) {
|
|
case CHECKSUM_COMPLETE:
|
|
if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
|
|
IPPROTO_ICMPV6, skb2->csum))
|
|
break;
|
|
/*FALLTHROUGH*/
|
|
case CHECKSUM_NONE:
|
|
skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
|
|
&ip6h->daddr,
|
|
skb2->len,
|
|
IPPROTO_ICMPV6, 0));
|
|
if (__skb_checksum_complete(skb2))
|
|
goto out;
|
|
}
|
|
|
|
err = 0;
|
|
|
|
BR_INPUT_SKB_CB(skb)->igmp = 1;
|
|
|
|
switch (icmp6_type) {
|
|
case ICMPV6_MGM_REPORT:
|
|
{
|
|
struct mld_msg *mld;
|
|
if (!pskb_may_pull(skb2, sizeof(*mld))) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
mld = (struct mld_msg *)skb_transport_header(skb2);
|
|
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
|
|
err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
|
|
break;
|
|
}
|
|
case ICMPV6_MLD2_REPORT:
|
|
err = br_ip6_multicast_mld2_report(br, port, skb2);
|
|
break;
|
|
case ICMPV6_MGM_QUERY:
|
|
err = br_ip6_multicast_query(br, port, skb2);
|
|
break;
|
|
case ICMPV6_MGM_REDUCTION:
|
|
{
|
|
struct mld_msg *mld;
|
|
if (!pskb_may_pull(skb2, sizeof(*mld))) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
mld = (struct mld_msg *)skb_transport_header(skb2);
|
|
br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
BR_INPUT_SKB_CB(skb)->igmp = 0;
|
|
BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
|
|
|
|
if (br->multicast_disabled)
|
|
return 0;
|
|
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
return br_multicast_ipv4_rcv(br, port, skb);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case htons(ETH_P_IPV6):
|
|
return br_multicast_ipv6_rcv(br, port, skb);
|
|
#endif
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void br_multicast_query_expired(unsigned long data)
|
|
{
|
|
struct net_bridge *br = (void *)data;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (br->multicast_startup_queries_sent <
|
|
br->multicast_startup_query_count)
|
|
br->multicast_startup_queries_sent++;
|
|
|
|
br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
|
|
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
void br_multicast_init(struct net_bridge *br)
|
|
{
|
|
br->hash_elasticity = 4;
|
|
br->hash_max = 512;
|
|
|
|
br->multicast_router = 1;
|
|
br->multicast_querier = 0;
|
|
br->multicast_last_member_count = 2;
|
|
br->multicast_startup_query_count = 2;
|
|
|
|
br->multicast_last_member_interval = HZ;
|
|
br->multicast_query_response_interval = 10 * HZ;
|
|
br->multicast_startup_query_interval = 125 * HZ / 4;
|
|
br->multicast_query_interval = 125 * HZ;
|
|
br->multicast_querier_interval = 255 * HZ;
|
|
br->multicast_membership_interval = 260 * HZ;
|
|
|
|
spin_lock_init(&br->multicast_lock);
|
|
setup_timer(&br->multicast_router_timer,
|
|
br_multicast_local_router_expired, 0);
|
|
setup_timer(&br->multicast_querier_timer,
|
|
br_multicast_querier_expired, (unsigned long)br);
|
|
setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
|
|
(unsigned long)br);
|
|
}
|
|
|
|
void br_multicast_open(struct net_bridge *br)
|
|
{
|
|
br->multicast_startup_queries_sent = 0;
|
|
|
|
if (br->multicast_disabled)
|
|
return;
|
|
|
|
mod_timer(&br->multicast_query_timer, jiffies);
|
|
}
|
|
|
|
void br_multicast_stop(struct net_bridge *br)
|
|
{
|
|
struct net_bridge_mdb_htable *mdb;
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct hlist_node *p, *n;
|
|
u32 ver;
|
|
int i;
|
|
|
|
del_timer_sync(&br->multicast_router_timer);
|
|
del_timer_sync(&br->multicast_querier_timer);
|
|
del_timer_sync(&br->multicast_query_timer);
|
|
|
|
spin_lock_bh(&br->multicast_lock);
|
|
mdb = mlock_dereference(br->mdb, br);
|
|
if (!mdb)
|
|
goto out;
|
|
|
|
br->mdb = NULL;
|
|
|
|
ver = mdb->ver;
|
|
for (i = 0; i < mdb->max; i++) {
|
|
hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
|
|
hlist[ver]) {
|
|
del_timer(&mp->timer);
|
|
call_rcu_bh(&mp->rcu, br_multicast_free_group);
|
|
}
|
|
}
|
|
|
|
if (mdb->old) {
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
rcu_barrier_bh();
|
|
spin_lock_bh(&br->multicast_lock);
|
|
WARN_ON(mdb->old);
|
|
}
|
|
|
|
mdb->old = mdb;
|
|
call_rcu_bh(&mdb->rcu, br_mdb_free);
|
|
|
|
out:
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
}
|
|
|
|
int br_multicast_set_router(struct net_bridge *br, unsigned long val)
|
|
{
|
|
int err = -ENOENT;
|
|
|
|
spin_lock_bh(&br->multicast_lock);
|
|
if (!netif_running(br->dev))
|
|
goto unlock;
|
|
|
|
switch (val) {
|
|
case 0:
|
|
case 2:
|
|
del_timer(&br->multicast_router_timer);
|
|
/* fall through */
|
|
case 1:
|
|
br->multicast_router = val;
|
|
err = 0;
|
|
break;
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
unlock:
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
|
|
{
|
|
struct net_bridge *br = p->br;
|
|
int err = -ENOENT;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
|
|
goto unlock;
|
|
|
|
switch (val) {
|
|
case 0:
|
|
case 1:
|
|
case 2:
|
|
p->multicast_router = val;
|
|
err = 0;
|
|
|
|
if (val < 2 && !hlist_unhashed(&p->rlist))
|
|
hlist_del_init_rcu(&p->rlist);
|
|
|
|
if (val == 1)
|
|
break;
|
|
|
|
del_timer(&p->multicast_router_timer);
|
|
|
|
if (val == 0)
|
|
break;
|
|
|
|
br_multicast_add_router(br, p);
|
|
break;
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
unlock:
|
|
spin_unlock(&br->multicast_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void br_multicast_start_querier(struct net_bridge *br)
|
|
{
|
|
struct net_bridge_port *port;
|
|
|
|
br_multicast_open(br);
|
|
|
|
list_for_each_entry(port, &br->port_list, list) {
|
|
if (port->state == BR_STATE_DISABLED ||
|
|
port->state == BR_STATE_BLOCKING)
|
|
continue;
|
|
|
|
__br_multicast_enable_port(port);
|
|
}
|
|
}
|
|
|
|
int br_multicast_toggle(struct net_bridge *br, unsigned long val)
|
|
{
|
|
int err = 0;
|
|
struct net_bridge_mdb_htable *mdb;
|
|
|
|
spin_lock_bh(&br->multicast_lock);
|
|
if (br->multicast_disabled == !val)
|
|
goto unlock;
|
|
|
|
br->multicast_disabled = !val;
|
|
if (br->multicast_disabled)
|
|
goto unlock;
|
|
|
|
if (!netif_running(br->dev))
|
|
goto unlock;
|
|
|
|
mdb = mlock_dereference(br->mdb, br);
|
|
if (mdb) {
|
|
if (mdb->old) {
|
|
err = -EEXIST;
|
|
rollback:
|
|
br->multicast_disabled = !!val;
|
|
goto unlock;
|
|
}
|
|
|
|
err = br_mdb_rehash(&br->mdb, mdb->max,
|
|
br->hash_elasticity);
|
|
if (err)
|
|
goto rollback;
|
|
}
|
|
|
|
br_multicast_start_querier(br);
|
|
|
|
unlock:
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
|
|
{
|
|
val = !!val;
|
|
|
|
spin_lock_bh(&br->multicast_lock);
|
|
if (br->multicast_querier == val)
|
|
goto unlock;
|
|
|
|
br->multicast_querier = val;
|
|
if (val)
|
|
br_multicast_start_querier(br);
|
|
|
|
unlock:
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
|
|
{
|
|
int err = -ENOENT;
|
|
u32 old;
|
|
struct net_bridge_mdb_htable *mdb;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev))
|
|
goto unlock;
|
|
|
|
err = -EINVAL;
|
|
if (!is_power_of_2(val))
|
|
goto unlock;
|
|
|
|
mdb = mlock_dereference(br->mdb, br);
|
|
if (mdb && val < mdb->size)
|
|
goto unlock;
|
|
|
|
err = 0;
|
|
|
|
old = br->hash_max;
|
|
br->hash_max = val;
|
|
|
|
if (mdb) {
|
|
if (mdb->old) {
|
|
err = -EEXIST;
|
|
rollback:
|
|
br->hash_max = old;
|
|
goto unlock;
|
|
}
|
|
|
|
err = br_mdb_rehash(&br->mdb, br->hash_max,
|
|
br->hash_elasticity);
|
|
if (err)
|
|
goto rollback;
|
|
}
|
|
|
|
unlock:
|
|
spin_unlock(&br->multicast_lock);
|
|
|
|
return err;
|
|
}
|