![Nikolay Aleksandrov](/assets/img/avatar_default.png)
Add support for a temporary router port which doesn't depend only on the incoming query. It can be refreshed if set to the same value, which is a no-op for the rest. Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2180 lines
50 KiB
C
2180 lines
50 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/export.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 <linux/inetdevice.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/ip6_checksum.h>
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#include <net/addrconf.h>
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#endif
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#include "br_private.h"
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static void br_multicast_start_querier(struct net_bridge *br,
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struct bridge_mcast_own_query *query);
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static void br_multicast_add_router(struct net_bridge *br,
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struct net_bridge_port *port);
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static void br_ip4_multicast_leave_group(struct net_bridge *br,
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struct net_bridge_port *port,
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__be32 group,
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__u16 vid);
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#if IS_ENABLED(CONFIG_IPV6)
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static void br_ip6_multicast_leave_group(struct net_bridge *br,
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struct net_bridge_port *port,
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const struct in6_addr *group,
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__u16 vid);
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#endif
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unsigned int br_mdb_rehash_seq;
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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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if (a->vid != b->vid)
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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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__u16 vid)
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{
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return jhash_2words((__force u32)ip, vid, mdb->secret) & (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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__u16 vid)
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{
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return jhash_2words(ipv6_addr_hash(ip), vid,
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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, ip->vid);
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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, ip->vid);
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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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hlist_for_each_entry_rcu(mp, &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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struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
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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, __u16 vid)
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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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br_dst.vid = vid;
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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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__u16 vid)
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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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br_dst.vid = vid;
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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, u16 vid)
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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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ip.vid = vid;
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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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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, &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, &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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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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br_mdb_notify(br->dev, p, RTM_DELMDB);
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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) || pg->flags & MDB_PG_FLAGS_PERMANENT)
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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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br_mdb_rehash_seq++;
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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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ether_addr_copy(eth->h_source, br->dev->dev_addr);
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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 = br->multicast_query_use_ifaddr ?
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inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 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;
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skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
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8 + sizeof(*mldq));
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if (!skb)
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goto out;
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skb->protocol = htons(ETH_P_IPV6);
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|
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/* Ethernet header */
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skb_reset_mac_header(skb);
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eth = eth_hdr(skb);
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ether_addr_copy(eth->h_source, br->dev->dev_addr);
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eth->h_proto = htons(ETH_P_IPV6);
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skb_put(skb, sizeof(*eth));
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|
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/* IPv6 header + HbH option */
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skb_set_network_header(skb, skb->len);
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ip6h = ipv6_hdr(skb);
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*(__force __be32 *)ip6h = htonl(0x60000000);
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ip6h->payload_len = htons(8 + sizeof(*mldq));
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ip6h->nexthdr = IPPROTO_HOPOPTS;
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ip6h->hop_limit = 1;
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ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
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if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
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&ip6h->saddr)) {
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kfree_skb(skb);
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return NULL;
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}
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ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
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hopopt = (u8 *)(ip6h + 1);
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hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
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hopopt[1] = 0; /* length of HbH */
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hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
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hopopt[3] = 2; /* Length of RA Option */
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hopopt[4] = 0; /* Type = 0x0000 (MLD) */
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hopopt[5] = 0;
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hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
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hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
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skb_put(skb, sizeof(*ip6h) + 8);
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/* ICMPv6 */
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skb_set_transport_header(skb, skb->len);
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mldq = (struct mld_msg *) icmp6_hdr(skb);
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|
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interval = ipv6_addr_any(group) ?
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br->multicast_query_response_interval :
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br->multicast_last_member_interval;
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mldq->mld_type = ICMPV6_MGM_QUERY;
|
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mldq->mld_code = 0;
|
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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;
|
|
unsigned int count = 0;
|
|
unsigned int max;
|
|
int elasticity;
|
|
int err;
|
|
|
|
mdb = rcu_dereference_protected(br->mdb, 1);
|
|
hlist_for_each_entry(mp, &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 of %d "
|
|
"reached, disabling snooping: %s\n",
|
|
br->hash_max,
|
|
port ? port->dev->name : br->dev->name);
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
struct net_bridge_port_group *br_multicast_new_port_group(
|
|
struct net_bridge_port *port,
|
|
struct br_ip *group,
|
|
struct net_bridge_port_group __rcu *next,
|
|
unsigned char flags)
|
|
{
|
|
struct net_bridge_port_group *p;
|
|
|
|
p = kzalloc(sizeof(*p), GFP_ATOMIC);
|
|
if (unlikely(!p))
|
|
return NULL;
|
|
|
|
p->addr = *group;
|
|
p->port = port;
|
|
p->flags = flags;
|
|
rcu_assign_pointer(p->next, next);
|
|
hlist_add_head(&p->mglist, &port->mglist);
|
|
setup_timer(&p->timer, br_multicast_port_group_expired,
|
|
(unsigned long)p);
|
|
return p;
|
|
}
|
|
|
|
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 = br_multicast_new_port_group(port, group, *pp, 0);
|
|
if (unlikely(!p))
|
|
goto err;
|
|
rcu_assign_pointer(*pp, p);
|
|
br_mdb_notify(br->dev, p, RTM_NEWMDB);
|
|
|
|
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,
|
|
__u16 vid)
|
|
{
|
|
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);
|
|
br_group.vid = vid;
|
|
|
|
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,
|
|
__u16 vid)
|
|
{
|
|
struct br_ip br_group;
|
|
|
|
if (ipv6_addr_is_ll_all_nodes(group))
|
|
return 0;
|
|
|
|
br_group.u.ip6 = *group;
|
|
br_group.proto = htons(ETH_P_IPV6);
|
|
br_group.vid = vid;
|
|
|
|
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 == MDB_RTR_TYPE_DISABLED ||
|
|
port->multicast_router == MDB_RTR_TYPE_PERM ||
|
|
timer_pending(&port->multicast_router_timer) ||
|
|
hlist_unhashed(&port->rlist))
|
|
goto out;
|
|
|
|
hlist_del_init_rcu(&port->rlist);
|
|
br_rtr_notify(br->dev, port, RTM_DELMDB);
|
|
/* Don't allow timer refresh if the router expired */
|
|
if (port->multicast_router == MDB_RTR_TYPE_TEMP)
|
|
port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
static void br_multicast_local_router_expired(unsigned long data)
|
|
{
|
|
}
|
|
|
|
static void br_multicast_querier_expired(struct net_bridge *br,
|
|
struct bridge_mcast_own_query *query)
|
|
{
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev) || br->multicast_disabled)
|
|
goto out;
|
|
|
|
br_multicast_start_querier(br, query);
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
static void br_ip4_multicast_querier_expired(unsigned long data)
|
|
{
|
|
struct net_bridge *br = (void *)data;
|
|
|
|
br_multicast_querier_expired(br, &br->ip4_own_query);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static void br_ip6_multicast_querier_expired(unsigned long data)
|
|
{
|
|
struct net_bridge *br = (void *)data;
|
|
|
|
br_multicast_querier_expired(br, &br->ip6_own_query);
|
|
}
|
|
#endif
|
|
|
|
static void br_multicast_select_own_querier(struct net_bridge *br,
|
|
struct br_ip *ip,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (ip->proto == htons(ETH_P_IP))
|
|
br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
else
|
|
br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
|
|
#endif
|
|
}
|
|
|
|
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->dev = port->dev;
|
|
NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
|
|
dev_net(port->dev), NULL, skb, NULL, skb->dev,
|
|
br_dev_queue_push_xmit);
|
|
} else {
|
|
br_multicast_select_own_querier(br, ip, skb);
|
|
netif_rx(skb);
|
|
}
|
|
}
|
|
|
|
static void br_multicast_send_query(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct bridge_mcast_own_query *own_query)
|
|
{
|
|
unsigned long time;
|
|
struct br_ip br_group;
|
|
struct bridge_mcast_other_query *other_query = NULL;
|
|
|
|
if (!netif_running(br->dev) || br->multicast_disabled ||
|
|
!br->multicast_querier)
|
|
return;
|
|
|
|
memset(&br_group.u, 0, sizeof(br_group.u));
|
|
|
|
if (port ? (own_query == &port->ip4_own_query) :
|
|
(own_query == &br->ip4_own_query)) {
|
|
other_query = &br->ip4_other_query;
|
|
br_group.proto = htons(ETH_P_IP);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
} else {
|
|
other_query = &br->ip6_other_query;
|
|
br_group.proto = htons(ETH_P_IPV6);
|
|
#endif
|
|
}
|
|
|
|
if (!other_query || timer_pending(&other_query->timer))
|
|
return;
|
|
|
|
__br_multicast_send_query(br, port, &br_group);
|
|
|
|
time = jiffies;
|
|
time += own_query->startup_sent < br->multicast_startup_query_count ?
|
|
br->multicast_startup_query_interval :
|
|
br->multicast_query_interval;
|
|
mod_timer(&own_query->timer, time);
|
|
}
|
|
|
|
static void
|
|
br_multicast_port_query_expired(struct net_bridge_port *port,
|
|
struct bridge_mcast_own_query *query)
|
|
{
|
|
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 (query->startup_sent < br->multicast_startup_query_count)
|
|
query->startup_sent++;
|
|
|
|
br_multicast_send_query(port->br, port, query);
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
static void br_ip4_multicast_port_query_expired(unsigned long data)
|
|
{
|
|
struct net_bridge_port *port = (void *)data;
|
|
|
|
br_multicast_port_query_expired(port, &port->ip4_own_query);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static void br_ip6_multicast_port_query_expired(unsigned long data)
|
|
{
|
|
struct net_bridge_port *port = (void *)data;
|
|
|
|
br_multicast_port_query_expired(port, &port->ip6_own_query);
|
|
}
|
|
#endif
|
|
|
|
void br_multicast_add_port(struct net_bridge_port *port)
|
|
{
|
|
port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
|
|
|
|
setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
|
|
(unsigned long)port);
|
|
setup_timer(&port->ip4_own_query.timer,
|
|
br_ip4_multicast_port_query_expired, (unsigned long)port);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
setup_timer(&port->ip6_own_query.timer,
|
|
br_ip6_multicast_port_query_expired, (unsigned long)port);
|
|
#endif
|
|
}
|
|
|
|
void br_multicast_del_port(struct net_bridge_port *port)
|
|
{
|
|
struct net_bridge *br = port->br;
|
|
struct net_bridge_port_group *pg;
|
|
struct hlist_node *n;
|
|
|
|
/* Take care of the remaining groups, only perm ones should be left */
|
|
spin_lock_bh(&br->multicast_lock);
|
|
hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
|
|
br_multicast_del_pg(br, pg);
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
del_timer_sync(&port->multicast_router_timer);
|
|
}
|
|
|
|
static void br_multicast_enable(struct bridge_mcast_own_query *query)
|
|
{
|
|
query->startup_sent = 0;
|
|
|
|
if (try_to_del_timer_sync(&query->timer) >= 0 ||
|
|
del_timer(&query->timer))
|
|
mod_timer(&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->ip4_own_query);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
br_multicast_enable(&port->ip6_own_query);
|
|
#endif
|
|
if (port->multicast_router == MDB_RTR_TYPE_PERM &&
|
|
hlist_unhashed(&port->rlist))
|
|
br_multicast_add_router(br, 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 *n;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
|
|
if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
|
|
br_multicast_del_pg(br, pg);
|
|
|
|
if (!hlist_unhashed(&port->rlist)) {
|
|
hlist_del_init_rcu(&port->rlist);
|
|
br_rtr_notify(br->dev, port, RTM_DELMDB);
|
|
/* Don't allow timer refresh if disabling */
|
|
if (port->multicast_router == MDB_RTR_TYPE_TEMP)
|
|
port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
|
|
}
|
|
del_timer(&port->multicast_router_timer);
|
|
del_timer(&port->ip4_own_query.timer);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
del_timer(&port->ip6_own_query.timer);
|
|
#endif
|
|
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,
|
|
u16 vid)
|
|
{
|
|
struct igmpv3_report *ih;
|
|
struct igmpv3_grec *grec;
|
|
int i;
|
|
int len;
|
|
int num;
|
|
int type;
|
|
int err = 0;
|
|
__be32 group;
|
|
|
|
ih = igmpv3_report_hdr(skb);
|
|
num = ntohs(ih->ngrec);
|
|
len = skb_transport_offset(skb) + 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;
|
|
}
|
|
|
|
if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
|
|
type == IGMPV3_MODE_IS_INCLUDE) &&
|
|
ntohs(grec->grec_nsrcs) == 0) {
|
|
br_ip4_multicast_leave_group(br, port, group, vid);
|
|
} else {
|
|
err = br_ip4_multicast_add_group(br, port, group, vid);
|
|
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,
|
|
u16 vid)
|
|
{
|
|
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 = skb_transport_offset(skb) + 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;
|
|
}
|
|
|
|
if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
|
|
grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
|
|
ntohs(*nsrcs) == 0) {
|
|
br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
|
|
vid);
|
|
} else {
|
|
err = br_ip6_multicast_add_group(br, port,
|
|
&grec->grec_mca, vid);
|
|
if (!err)
|
|
break;
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
static bool br_ip4_multicast_select_querier(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
__be32 saddr)
|
|
{
|
|
if (!timer_pending(&br->ip4_own_query.timer) &&
|
|
!timer_pending(&br->ip4_other_query.timer))
|
|
goto update;
|
|
|
|
if (!br->ip4_querier.addr.u.ip4)
|
|
goto update;
|
|
|
|
if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
|
|
goto update;
|
|
|
|
return false;
|
|
|
|
update:
|
|
br->ip4_querier.addr.u.ip4 = saddr;
|
|
|
|
/* update protected by general multicast_lock by caller */
|
|
rcu_assign_pointer(br->ip4_querier.port, port);
|
|
|
|
return true;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static bool br_ip6_multicast_select_querier(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct in6_addr *saddr)
|
|
{
|
|
if (!timer_pending(&br->ip6_own_query.timer) &&
|
|
!timer_pending(&br->ip6_other_query.timer))
|
|
goto update;
|
|
|
|
if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
|
|
goto update;
|
|
|
|
return false;
|
|
|
|
update:
|
|
br->ip6_querier.addr.u.ip6 = *saddr;
|
|
|
|
/* update protected by general multicast_lock by caller */
|
|
rcu_assign_pointer(br->ip6_querier.port, port);
|
|
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
static bool br_multicast_select_querier(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct br_ip *saddr)
|
|
{
|
|
switch (saddr->proto) {
|
|
case htons(ETH_P_IP):
|
|
return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case htons(ETH_P_IPV6):
|
|
return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
|
|
#endif
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void
|
|
br_multicast_update_query_timer(struct net_bridge *br,
|
|
struct bridge_mcast_other_query *query,
|
|
unsigned long max_delay)
|
|
{
|
|
if (!timer_pending(&query->timer))
|
|
query->delay_time = jiffies + max_delay;
|
|
|
|
mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
|
|
}
|
|
|
|
/*
|
|
* Add port to router_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 *slot = NULL;
|
|
|
|
if (!hlist_unhashed(&port->rlist))
|
|
return;
|
|
|
|
hlist_for_each_entry(p, &br->router_list, rlist) {
|
|
if ((unsigned long) port >= (unsigned long) p)
|
|
break;
|
|
slot = &p->rlist;
|
|
}
|
|
|
|
if (slot)
|
|
hlist_add_behind_rcu(&port->rlist, slot);
|
|
else
|
|
hlist_add_head_rcu(&port->rlist, &br->router_list);
|
|
br_rtr_notify(br->dev, port, RTM_NEWMDB);
|
|
}
|
|
|
|
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 == MDB_RTR_TYPE_TEMP_QUERY)
|
|
mod_timer(&br->multicast_router_timer,
|
|
now + br->multicast_querier_interval);
|
|
return;
|
|
}
|
|
|
|
if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
|
|
port->multicast_router == MDB_RTR_TYPE_PERM)
|
|
return;
|
|
|
|
br_multicast_add_router(br, port);
|
|
|
|
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,
|
|
struct bridge_mcast_other_query *query,
|
|
struct br_ip *saddr,
|
|
unsigned long max_delay)
|
|
{
|
|
if (!br_multicast_select_querier(br, port, saddr))
|
|
return;
|
|
|
|
br_multicast_update_query_timer(br, query, max_delay);
|
|
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,
|
|
u16 vid)
|
|
{
|
|
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;
|
|
struct br_ip saddr;
|
|
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;
|
|
|
|
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 (skb->len >= sizeof(*ih3)) {
|
|
ih3 = igmpv3_query_hdr(skb);
|
|
if (ih3->nsrcs)
|
|
goto out;
|
|
|
|
max_delay = ih3->code ?
|
|
IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
|
|
} else {
|
|
goto out;
|
|
}
|
|
|
|
if (!group) {
|
|
saddr.proto = htons(ETH_P_IP);
|
|
saddr.u.ip4 = iph->saddr;
|
|
|
|
br_multicast_query_received(br, port, &br->ip4_other_query,
|
|
&saddr, max_delay);
|
|
goto out;
|
|
}
|
|
|
|
mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
|
|
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,
|
|
u16 vid)
|
|
{
|
|
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
|
|
struct mld_msg *mld;
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct mld2_query *mld2q;
|
|
struct net_bridge_port_group *p;
|
|
struct net_bridge_port_group __rcu **pp;
|
|
struct br_ip saddr;
|
|
unsigned long max_delay;
|
|
unsigned long now = jiffies;
|
|
const struct in6_addr *group = NULL;
|
|
bool is_general_query;
|
|
int err = 0;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev) ||
|
|
(port && port->state == BR_STATE_DISABLED))
|
|
goto out;
|
|
|
|
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(ntohs(mld->mld_maxdelay));
|
|
if (max_delay)
|
|
group = &mld->mld_mca;
|
|
} else {
|
|
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 = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
|
|
}
|
|
|
|
is_general_query = group && ipv6_addr_any(group);
|
|
|
|
if (is_general_query) {
|
|
saddr.proto = htons(ETH_P_IPV6);
|
|
saddr.u.ip6 = ip6h->saddr;
|
|
|
|
br_multicast_query_received(br, port, &br->ip6_other_query,
|
|
&saddr, max_delay);
|
|
goto out;
|
|
} else if (!group) {
|
|
goto out;
|
|
}
|
|
|
|
mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
|
|
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 bridge_mcast_other_query *other_query,
|
|
struct bridge_mcast_own_query *own_query)
|
|
{
|
|
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))
|
|
goto out;
|
|
|
|
mdb = mlock_dereference(br->mdb, br);
|
|
mp = br_mdb_ip_get(mdb, group);
|
|
if (!mp)
|
|
goto out;
|
|
|
|
if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
|
|
struct net_bridge_port_group __rcu **pp;
|
|
|
|
for (pp = &mp->ports;
|
|
(p = mlock_dereference(*pp, br)) != NULL;
|
|
pp = &p->next) {
|
|
if (p->port != port)
|
|
continue;
|
|
|
|
rcu_assign_pointer(*pp, p->next);
|
|
hlist_del_init(&p->mglist);
|
|
del_timer(&p->timer);
|
|
call_rcu_bh(&p->rcu, br_multicast_free_pg);
|
|
br_mdb_notify(br->dev, p, RTM_DELMDB);
|
|
|
|
if (!mp->ports && !mp->mglist &&
|
|
netif_running(br->dev))
|
|
mod_timer(&mp->timer, jiffies);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
if (timer_pending(&other_query->timer))
|
|
goto out;
|
|
|
|
if (br->multicast_querier) {
|
|
__br_multicast_send_query(br, port, &mp->addr);
|
|
|
|
time = jiffies + br->multicast_last_member_count *
|
|
br->multicast_last_member_interval;
|
|
|
|
mod_timer(&own_query->timer, time);
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
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,
|
|
__u16 vid)
|
|
{
|
|
struct br_ip br_group;
|
|
struct bridge_mcast_own_query *own_query;
|
|
|
|
if (ipv4_is_local_multicast(group))
|
|
return;
|
|
|
|
own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
|
|
|
|
br_group.u.ip4 = group;
|
|
br_group.proto = htons(ETH_P_IP);
|
|
br_group.vid = vid;
|
|
|
|
br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
|
|
own_query);
|
|
}
|
|
|
|
#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,
|
|
__u16 vid)
|
|
{
|
|
struct br_ip br_group;
|
|
struct bridge_mcast_own_query *own_query;
|
|
|
|
if (ipv6_addr_is_ll_all_nodes(group))
|
|
return;
|
|
|
|
own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
|
|
|
|
br_group.u.ip6 = *group;
|
|
br_group.proto = htons(ETH_P_IPV6);
|
|
br_group.vid = vid;
|
|
|
|
br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
|
|
own_query);
|
|
}
|
|
#endif
|
|
|
|
static int br_multicast_ipv4_rcv(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct sk_buff *skb,
|
|
u16 vid)
|
|
{
|
|
struct sk_buff *skb_trimmed = NULL;
|
|
struct igmphdr *ih;
|
|
int err;
|
|
|
|
err = ip_mc_check_igmp(skb, &skb_trimmed);
|
|
|
|
if (err == -ENOMSG) {
|
|
if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
|
|
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
|
|
return 0;
|
|
} else if (err < 0) {
|
|
return err;
|
|
}
|
|
|
|
BR_INPUT_SKB_CB(skb)->igmp = 1;
|
|
ih = igmp_hdr(skb);
|
|
|
|
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, vid);
|
|
break;
|
|
case IGMPV3_HOST_MEMBERSHIP_REPORT:
|
|
err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
|
|
break;
|
|
case IGMP_HOST_MEMBERSHIP_QUERY:
|
|
err = br_ip4_multicast_query(br, port, skb_trimmed, vid);
|
|
break;
|
|
case IGMP_HOST_LEAVE_MESSAGE:
|
|
br_ip4_multicast_leave_group(br, port, ih->group, vid);
|
|
break;
|
|
}
|
|
|
|
if (skb_trimmed && skb_trimmed != skb)
|
|
kfree_skb(skb_trimmed);
|
|
|
|
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,
|
|
u16 vid)
|
|
{
|
|
struct sk_buff *skb_trimmed = NULL;
|
|
struct mld_msg *mld;
|
|
int err;
|
|
|
|
err = ipv6_mc_check_mld(skb, &skb_trimmed);
|
|
|
|
if (err == -ENOMSG) {
|
|
if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
|
|
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
|
|
return 0;
|
|
} else if (err < 0) {
|
|
return err;
|
|
}
|
|
|
|
BR_INPUT_SKB_CB(skb)->igmp = 1;
|
|
mld = (struct mld_msg *)skb_transport_header(skb);
|
|
|
|
switch (mld->mld_type) {
|
|
case ICMPV6_MGM_REPORT:
|
|
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
|
|
err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
|
|
break;
|
|
case ICMPV6_MLD2_REPORT:
|
|
err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
|
|
break;
|
|
case ICMPV6_MGM_QUERY:
|
|
err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
|
|
break;
|
|
case ICMPV6_MGM_REDUCTION:
|
|
br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
|
|
break;
|
|
}
|
|
|
|
if (skb_trimmed && skb_trimmed != skb)
|
|
kfree_skb(skb_trimmed);
|
|
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
|
|
struct sk_buff *skb, u16 vid)
|
|
{
|
|
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, vid);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case htons(ETH_P_IPV6):
|
|
return br_multicast_ipv6_rcv(br, port, skb, vid);
|
|
#endif
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void br_multicast_query_expired(struct net_bridge *br,
|
|
struct bridge_mcast_own_query *query,
|
|
struct bridge_mcast_querier *querier)
|
|
{
|
|
spin_lock(&br->multicast_lock);
|
|
if (query->startup_sent < br->multicast_startup_query_count)
|
|
query->startup_sent++;
|
|
|
|
RCU_INIT_POINTER(querier->port, NULL);
|
|
br_multicast_send_query(br, NULL, query);
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
static void br_ip4_multicast_query_expired(unsigned long data)
|
|
{
|
|
struct net_bridge *br = (void *)data;
|
|
|
|
br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
static void br_ip6_multicast_query_expired(unsigned long data)
|
|
{
|
|
struct net_bridge *br = (void *)data;
|
|
|
|
br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
|
|
}
|
|
#endif
|
|
|
|
void br_multicast_init(struct net_bridge *br)
|
|
{
|
|
br->hash_elasticity = 4;
|
|
br->hash_max = 512;
|
|
|
|
br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
|
|
br->multicast_querier = 0;
|
|
br->multicast_query_use_ifaddr = 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;
|
|
|
|
br->ip4_other_query.delay_time = 0;
|
|
br->ip4_querier.port = NULL;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
br->ip6_other_query.delay_time = 0;
|
|
br->ip6_querier.port = NULL;
|
|
#endif
|
|
|
|
spin_lock_init(&br->multicast_lock);
|
|
setup_timer(&br->multicast_router_timer,
|
|
br_multicast_local_router_expired, 0);
|
|
setup_timer(&br->ip4_other_query.timer,
|
|
br_ip4_multicast_querier_expired, (unsigned long)br);
|
|
setup_timer(&br->ip4_own_query.timer, br_ip4_multicast_query_expired,
|
|
(unsigned long)br);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
setup_timer(&br->ip6_other_query.timer,
|
|
br_ip6_multicast_querier_expired, (unsigned long)br);
|
|
setup_timer(&br->ip6_own_query.timer, br_ip6_multicast_query_expired,
|
|
(unsigned long)br);
|
|
#endif
|
|
}
|
|
|
|
static void __br_multicast_open(struct net_bridge *br,
|
|
struct bridge_mcast_own_query *query)
|
|
{
|
|
query->startup_sent = 0;
|
|
|
|
if (br->multicast_disabled)
|
|
return;
|
|
|
|
mod_timer(&query->timer, jiffies);
|
|
}
|
|
|
|
void br_multicast_open(struct net_bridge *br)
|
|
{
|
|
__br_multicast_open(br, &br->ip4_own_query);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
__br_multicast_open(br, &br->ip6_own_query);
|
|
#endif
|
|
}
|
|
|
|
void br_multicast_stop(struct net_bridge *br)
|
|
{
|
|
del_timer_sync(&br->multicast_router_timer);
|
|
del_timer_sync(&br->ip4_other_query.timer);
|
|
del_timer_sync(&br->ip4_own_query.timer);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
del_timer_sync(&br->ip6_other_query.timer);
|
|
del_timer_sync(&br->ip6_own_query.timer);
|
|
#endif
|
|
}
|
|
|
|
void br_multicast_dev_del(struct net_bridge *br)
|
|
{
|
|
struct net_bridge_mdb_htable *mdb;
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct hlist_node *n;
|
|
u32 ver;
|
|
int i;
|
|
|
|
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, 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 = -EINVAL;
|
|
|
|
spin_lock_bh(&br->multicast_lock);
|
|
|
|
switch (val) {
|
|
case MDB_RTR_TYPE_DISABLED:
|
|
case MDB_RTR_TYPE_PERM:
|
|
del_timer(&br->multicast_router_timer);
|
|
/* fall through */
|
|
case MDB_RTR_TYPE_TEMP_QUERY:
|
|
br->multicast_router = val;
|
|
err = 0;
|
|
break;
|
|
}
|
|
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void __del_port_router(struct net_bridge_port *p)
|
|
{
|
|
if (hlist_unhashed(&p->rlist))
|
|
return;
|
|
hlist_del_init_rcu(&p->rlist);
|
|
br_rtr_notify(p->br->dev, p, RTM_DELMDB);
|
|
}
|
|
|
|
int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
|
|
{
|
|
struct net_bridge *br = p->br;
|
|
unsigned long now = jiffies;
|
|
int err = -EINVAL;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (p->multicast_router == val) {
|
|
/* Refresh the temp router port timer */
|
|
if (p->multicast_router == MDB_RTR_TYPE_TEMP)
|
|
mod_timer(&p->multicast_router_timer,
|
|
now + br->multicast_querier_interval);
|
|
err = 0;
|
|
goto unlock;
|
|
}
|
|
switch (val) {
|
|
case MDB_RTR_TYPE_DISABLED:
|
|
p->multicast_router = MDB_RTR_TYPE_DISABLED;
|
|
__del_port_router(p);
|
|
del_timer(&p->multicast_router_timer);
|
|
break;
|
|
case MDB_RTR_TYPE_TEMP_QUERY:
|
|
p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
|
|
__del_port_router(p);
|
|
break;
|
|
case MDB_RTR_TYPE_PERM:
|
|
p->multicast_router = MDB_RTR_TYPE_PERM;
|
|
del_timer(&p->multicast_router_timer);
|
|
br_multicast_add_router(br, p);
|
|
break;
|
|
case MDB_RTR_TYPE_TEMP:
|
|
p->multicast_router = MDB_RTR_TYPE_TEMP;
|
|
br_multicast_mark_router(br, p);
|
|
break;
|
|
default:
|
|
goto unlock;
|
|
}
|
|
err = 0;
|
|
unlock:
|
|
spin_unlock(&br->multicast_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void br_multicast_start_querier(struct net_bridge *br,
|
|
struct bridge_mcast_own_query *query)
|
|
{
|
|
struct net_bridge_port *port;
|
|
|
|
__br_multicast_open(br, query);
|
|
|
|
list_for_each_entry(port, &br->port_list, list) {
|
|
if (port->state == BR_STATE_DISABLED ||
|
|
port->state == BR_STATE_BLOCKING)
|
|
continue;
|
|
|
|
if (query == &br->ip4_own_query)
|
|
br_multicast_enable(&port->ip4_own_query);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
else
|
|
br_multicast_enable(&port->ip6_own_query);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
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, &br->ip4_own_query);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
br_multicast_start_querier(br, &br->ip6_own_query);
|
|
#endif
|
|
|
|
unlock:
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
|
|
{
|
|
unsigned long max_delay;
|
|
|
|
val = !!val;
|
|
|
|
spin_lock_bh(&br->multicast_lock);
|
|
if (br->multicast_querier == val)
|
|
goto unlock;
|
|
|
|
br->multicast_querier = val;
|
|
if (!val)
|
|
goto unlock;
|
|
|
|
max_delay = br->multicast_query_response_interval;
|
|
|
|
if (!timer_pending(&br->ip4_other_query.timer))
|
|
br->ip4_other_query.delay_time = jiffies + max_delay;
|
|
|
|
br_multicast_start_querier(br, &br->ip4_own_query);
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (!timer_pending(&br->ip6_other_query.timer))
|
|
br->ip6_other_query.delay_time = jiffies + max_delay;
|
|
|
|
br_multicast_start_querier(br, &br->ip6_own_query);
|
|
#endif
|
|
|
|
unlock:
|
|
spin_unlock_bh(&br->multicast_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
|
|
{
|
|
int err = -EINVAL;
|
|
u32 old;
|
|
struct net_bridge_mdb_htable *mdb;
|
|
|
|
spin_lock_bh(&br->multicast_lock);
|
|
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_bh(&br->multicast_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* br_multicast_list_adjacent - Returns snooped multicast addresses
|
|
* @dev: The bridge port adjacent to which to retrieve addresses
|
|
* @br_ip_list: The list to store found, snooped multicast IP addresses in
|
|
*
|
|
* Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
|
|
* snooping feature on all bridge ports of dev's bridge device, excluding
|
|
* the addresses from dev itself.
|
|
*
|
|
* Returns the number of items added to br_ip_list.
|
|
*
|
|
* Notes:
|
|
* - br_ip_list needs to be initialized by caller
|
|
* - br_ip_list might contain duplicates in the end
|
|
* (needs to be taken care of by caller)
|
|
* - br_ip_list needs to be freed by caller
|
|
*/
|
|
int br_multicast_list_adjacent(struct net_device *dev,
|
|
struct list_head *br_ip_list)
|
|
{
|
|
struct net_bridge *br;
|
|
struct net_bridge_port *port;
|
|
struct net_bridge_port_group *group;
|
|
struct br_ip_list *entry;
|
|
int count = 0;
|
|
|
|
rcu_read_lock();
|
|
if (!br_ip_list || !br_port_exists(dev))
|
|
goto unlock;
|
|
|
|
port = br_port_get_rcu(dev);
|
|
if (!port || !port->br)
|
|
goto unlock;
|
|
|
|
br = port->br;
|
|
|
|
list_for_each_entry_rcu(port, &br->port_list, list) {
|
|
if (!port->dev || port->dev == dev)
|
|
continue;
|
|
|
|
hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
|
|
entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
|
|
if (!entry)
|
|
goto unlock;
|
|
|
|
entry->addr = group->addr;
|
|
list_add(&entry->list, br_ip_list);
|
|
count++;
|
|
}
|
|
}
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
return count;
|
|
}
|
|
EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
|
|
|
|
/**
|
|
* br_multicast_has_querier_anywhere - Checks for a querier on a bridge
|
|
* @dev: The bridge port providing the bridge on which to check for a querier
|
|
* @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
|
|
*
|
|
* Checks whether the given interface has a bridge on top and if so returns
|
|
* true if a valid querier exists anywhere on the bridged link layer.
|
|
* Otherwise returns false.
|
|
*/
|
|
bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
|
|
{
|
|
struct net_bridge *br;
|
|
struct net_bridge_port *port;
|
|
struct ethhdr eth;
|
|
bool ret = false;
|
|
|
|
rcu_read_lock();
|
|
if (!br_port_exists(dev))
|
|
goto unlock;
|
|
|
|
port = br_port_get_rcu(dev);
|
|
if (!port || !port->br)
|
|
goto unlock;
|
|
|
|
br = port->br;
|
|
|
|
memset(ð, 0, sizeof(eth));
|
|
eth.h_proto = htons(proto);
|
|
|
|
ret = br_multicast_querier_exists(br, ð);
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
|
|
|
|
/**
|
|
* br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
|
|
* @dev: The bridge port adjacent to which to check for a querier
|
|
* @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
|
|
*
|
|
* Checks whether the given interface has a bridge on top and if so returns
|
|
* true if a selected querier is behind one of the other ports of this
|
|
* bridge. Otherwise returns false.
|
|
*/
|
|
bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
|
|
{
|
|
struct net_bridge *br;
|
|
struct net_bridge_port *port;
|
|
bool ret = false;
|
|
|
|
rcu_read_lock();
|
|
if (!br_port_exists(dev))
|
|
goto unlock;
|
|
|
|
port = br_port_get_rcu(dev);
|
|
if (!port || !port->br)
|
|
goto unlock;
|
|
|
|
br = port->br;
|
|
|
|
switch (proto) {
|
|
case ETH_P_IP:
|
|
if (!timer_pending(&br->ip4_other_query.timer) ||
|
|
rcu_dereference(br->ip4_querier.port) == port)
|
|
goto unlock;
|
|
break;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
case ETH_P_IPV6:
|
|
if (!timer_pending(&br->ip6_other_query.timer) ||
|
|
rcu_dereference(br->ip6_querier.port) == port)
|
|
goto unlock;
|
|
break;
|
|
#endif
|
|
default:
|
|
goto unlock;
|
|
}
|
|
|
|
ret = true;
|
|
unlock:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
|