![YOSHIFUJI Hideaki / 吉藤英明](/assets/img/avatar_default.png)
Even with commit 32dec5dd02
("bridge
br_multicast: Don't refer to BR_INPUT_SKB_CB(skb)->mrouters_only
without IGMP snooping."), BR_INPUT_SKB_CB(skb)->mrouters_only is
not appropriately initialized if IGMP snooping support is
compiled and disabled, so we can see garbage.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
1310 lines
28 KiB
C
1310 lines
28 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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#include "br_private.h"
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static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
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{
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return jhash_1word(mdb->secret, (u32)ip) & (mdb->max - 1);
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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, __be32 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 (dst == mp->addr)
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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, __be32 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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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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if (br->multicast_disabled)
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return NULL;
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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if (BR_INPUT_SKB_CB(skb)->igmp)
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break;
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return br_mdb_ip_get(br->mdb, ip_hdr(skb)->daddr);
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}
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return NULL;
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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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if (!hlist_unhashed(&mp->mglist))
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hlist_del_init(&mp->mglist);
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if (mp->ports)
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goto out;
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mdb = br->mdb;
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hlist_del_rcu(&mp->hlist[mdb->ver]);
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mdb->size--;
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del_timer(&mp->query_timer);
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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 = br->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 **pp;
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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; (p = *pp); pp = &p->next) {
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if (p != pg)
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continue;
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*pp = p->next;
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hlist_del_init(&p->mglist);
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del_timer(&p->timer);
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del_timer(&p->query_timer);
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call_rcu_bh(&p->rcu, br_multicast_free_pg);
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if (!mp->ports && hlist_unhashed(&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 **mdbp, int max,
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int elasticity)
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{
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struct net_bridge_mdb_htable *old = *mdbp;
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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_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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static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
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{
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struct net_bridge *br = mp->br;
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struct sk_buff *skb;
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skb = br_multicast_alloc_query(br, mp->addr);
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if (!skb)
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goto timer;
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netif_rx(skb);
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timer:
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if (++mp->queries_sent < br->multicast_last_member_count)
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mod_timer(&mp->query_timer,
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jiffies + br->multicast_last_member_interval);
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}
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static void br_multicast_group_query_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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spin_lock(&br->multicast_lock);
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if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
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mp->queries_sent >= br->multicast_last_member_count)
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goto out;
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br_multicast_send_group_query(mp);
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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_send_port_group_query(struct net_bridge_port_group *pg)
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{
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struct net_bridge_port *port = pg->port;
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struct net_bridge *br = port->br;
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struct sk_buff *skb;
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skb = br_multicast_alloc_query(br, pg->addr);
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if (!skb)
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goto timer;
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br_deliver(port, skb);
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timer:
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if (++pg->queries_sent < br->multicast_last_member_count)
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mod_timer(&pg->query_timer,
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jiffies + br->multicast_last_member_interval);
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}
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static void br_multicast_port_group_query_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_port *port = pg->port;
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struct net_bridge *br = port->br;
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spin_lock(&br->multicast_lock);
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if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
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pg->queries_sent >= br->multicast_last_member_count)
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goto out;
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br_multicast_send_port_group_query(pg);
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out:
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spin_unlock(&br->multicast_lock);
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}
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static struct net_bridge_mdb_entry *br_multicast_get_group(
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struct net_bridge *br, struct net_bridge_port *port, __be32 group,
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int hash)
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{
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struct net_bridge_mdb_htable *mdb = br->mdb;
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struct net_bridge_mdb_entry *mp;
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struct hlist_node *p;
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unsigned count = 0;
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unsigned max;
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int elasticity;
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int err;
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hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
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count++;
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if (unlikely(group == mp->addr)) {
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return mp;
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}
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}
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elasticity = 0;
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max = mdb->max;
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if (unlikely(count > br->hash_elasticity && count)) {
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if (net_ratelimit())
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printk(KERN_INFO "%s: Multicast hash table "
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"chain limit reached: %s\n",
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br->dev->name, port ? port->dev->name :
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br->dev->name);
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elasticity = br->hash_elasticity;
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}
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if (mdb->size >= max) {
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max *= 2;
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if (unlikely(max >= br->hash_max)) {
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printk(KERN_WARNING "%s: Multicast hash table maximum "
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"reached, disabling snooping: %s, %d\n",
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br->dev->name, port ? port->dev->name :
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br->dev->name,
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max);
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err = -E2BIG;
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disable:
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br->multicast_disabled = 1;
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goto err;
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}
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}
|
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if (max > mdb->max || elasticity) {
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if (mdb->old) {
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if (net_ratelimit())
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printk(KERN_INFO "%s: Multicast hash table "
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"on fire: %s\n",
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br->dev->name, port ? port->dev->name :
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br->dev->name);
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err = -EEXIST;
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goto err;
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}
|
|
|
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err = br_mdb_rehash(&br->mdb, max, elasticity);
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if (err) {
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printk(KERN_WARNING "%s: Cannot rehash multicast "
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"hash table, disabling snooping: "
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"%s, %d, %d\n",
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br->dev->name, port ? port->dev->name :
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br->dev->name,
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mdb->size, err);
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goto disable;
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}
|
|
|
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err = -EAGAIN;
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goto err;
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|
}
|
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|
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return NULL;
|
|
|
|
err:
|
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mp = ERR_PTR(err);
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return mp;
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}
|
|
|
|
static struct net_bridge_mdb_entry *br_multicast_new_group(
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struct net_bridge *br, struct net_bridge_port *port, __be32 group)
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{
|
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struct net_bridge_mdb_htable *mdb = br->mdb;
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struct net_bridge_mdb_entry *mp;
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int hash;
|
|
|
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if (!mdb) {
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if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0))
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return NULL;
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goto rehash;
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|
}
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|
|
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hash = br_ip_hash(mdb, group);
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mp = br_multicast_get_group(br, port, group, hash);
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switch (PTR_ERR(mp)) {
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case 0:
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break;
|
|
|
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case -EAGAIN:
|
|
rehash:
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mdb = br->mdb;
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hash = br_ip_hash(mdb, group);
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break;
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|
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default:
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goto out;
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}
|
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mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
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if (unlikely(!mp))
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goto out;
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|
|
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mp->br = br;
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mp->addr = group;
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setup_timer(&mp->timer, br_multicast_group_expired,
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(unsigned long)mp);
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setup_timer(&mp->query_timer, br_multicast_group_query_expired,
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(unsigned long)mp);
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|
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hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
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mdb->size++;
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|
|
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out:
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return mp;
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}
|
|
|
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static int br_multicast_add_group(struct net_bridge *br,
|
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struct net_bridge_port *port, __be32 group)
|
|
{
|
|
struct net_bridge_mdb_entry *mp;
|
|
struct net_bridge_port_group *p;
|
|
struct net_bridge_port_group **pp;
|
|
unsigned long now = jiffies;
|
|
int err;
|
|
|
|
if (ipv4_is_local_multicast(group))
|
|
return 0;
|
|
|
|
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 (unlikely(IS_ERR(mp) || !mp))
|
|
goto err;
|
|
|
|
if (!port) {
|
|
hlist_add_head(&mp->mglist, &br->mglist);
|
|
mod_timer(&mp->timer, now + br->multicast_membership_interval);
|
|
goto out;
|
|
}
|
|
|
|
for (pp = &mp->ports; (p = *pp); 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);
|
|
setup_timer(&p->query_timer, br_multicast_port_group_query_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 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_send_query(struct net_bridge *br,
|
|
struct net_bridge_port *port, u32 sent)
|
|
{
|
|
unsigned long time;
|
|
struct sk_buff *skb;
|
|
|
|
if (!netif_running(br->dev) || br->multicast_disabled ||
|
|
timer_pending(&br->multicast_querier_timer))
|
|
return;
|
|
|
|
skb = br_multicast_alloc_query(br, 0);
|
|
if (!skb)
|
|
goto timer;
|
|
|
|
if (port) {
|
|
__skb_push(skb, sizeof(struct ethhdr));
|
|
skb->dev = port->dev;
|
|
NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
|
|
dev_queue_xmit);
|
|
} else
|
|
netif_rx(skb);
|
|
|
|
timer:
|
|
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_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_multicast_add_group(br, port, group);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static void br_multicast_add_router(struct net_bridge *br,
|
|
struct net_bridge_port *port)
|
|
{
|
|
struct hlist_node *p;
|
|
struct hlist_node **h;
|
|
|
|
for (h = &br->router_list.first;
|
|
(p = *h) &&
|
|
(unsigned long)container_of(p, struct net_bridge_port, rlist) >
|
|
(unsigned long)port;
|
|
h = &p->next)
|
|
;
|
|
|
|
port->rlist.pprev = h;
|
|
port->rlist.next = p;
|
|
rcu_assign_pointer(*h, &port->rlist);
|
|
if (p)
|
|
p->pprev = &port->rlist.next;
|
|
}
|
|
|
|
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,
|
|
__be32 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_multicast_query(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
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 **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_ip_get(br->mdb, group);
|
|
if (!mp)
|
|
goto out;
|
|
|
|
max_delay *= br->multicast_last_member_count;
|
|
|
|
if (!hlist_unhashed(&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 = *pp); 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(&mp->timer, now + max_delay);
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
return err;
|
|
}
|
|
|
|
static void br_multicast_leave_group(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
__be32 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;
|
|
|
|
if (ipv4_is_local_multicast(group))
|
|
return;
|
|
|
|
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 = br->mdb;
|
|
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 (!hlist_unhashed(&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);
|
|
|
|
mp->queries_sent = 0;
|
|
mod_timer(&mp->query_timer, now);
|
|
}
|
|
|
|
goto out;
|
|
}
|
|
|
|
for (p = mp->ports; p; p = p->next) {
|
|
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);
|
|
|
|
p->queries_sent = 0;
|
|
mod_timer(&p->query_timer, now);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&br->multicast_lock);
|
|
}
|
|
|
|
static int br_multicast_ipv4_rcv(struct net_bridge *br,
|
|
struct net_bridge_port *port,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *skb2 = skb;
|
|
struct iphdr *iph;
|
|
struct igmphdr *ih;
|
|
unsigned len;
|
|
unsigned 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)
|
|
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;
|
|
|
|
iph = ip_hdr(skb2);
|
|
|
|
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(skb2)->mrouters_only = 1;
|
|
err = br_multicast_add_group(br, port, ih->group);
|
|
break;
|
|
case IGMPV3_HOST_MEMBERSHIP_REPORT:
|
|
err = br_multicast_igmp3_report(br, port, skb2);
|
|
break;
|
|
case IGMP_HOST_MEMBERSHIP_QUERY:
|
|
err = br_multicast_query(br, port, skb2);
|
|
break;
|
|
case IGMP_HOST_LEAVE_MESSAGE:
|
|
br_multicast_leave_group(br, port, ih->group);
|
|
break;
|
|
}
|
|
|
|
out:
|
|
__skb_push(skb2, offset);
|
|
err_out:
|
|
if (skb2 != skb)
|
|
kfree_skb(skb2);
|
|
return err;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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_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_local_router_expired, 0);
|
|
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 = br->mdb;
|
|
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);
|
|
del_timer(&mp->query_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;
|
|
}
|
|
|
|
int br_multicast_toggle(struct net_bridge *br, unsigned long val)
|
|
{
|
|
struct net_bridge_port *port;
|
|
int err = -ENOENT;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev))
|
|
goto unlock;
|
|
|
|
err = 0;
|
|
if (br->multicast_disabled == !val)
|
|
goto unlock;
|
|
|
|
br->multicast_disabled = !val;
|
|
if (br->multicast_disabled)
|
|
goto unlock;
|
|
|
|
if (br->mdb) {
|
|
if (br->mdb->old) {
|
|
err = -EEXIST;
|
|
rollback:
|
|
br->multicast_disabled = !!val;
|
|
goto unlock;
|
|
}
|
|
|
|
err = br_mdb_rehash(&br->mdb, br->mdb->max,
|
|
br->hash_elasticity);
|
|
if (err)
|
|
goto rollback;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
unlock:
|
|
spin_unlock(&br->multicast_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
|
|
{
|
|
int err = -ENOENT;
|
|
u32 old;
|
|
|
|
spin_lock(&br->multicast_lock);
|
|
if (!netif_running(br->dev))
|
|
goto unlock;
|
|
|
|
err = -EINVAL;
|
|
if (!is_power_of_2(val))
|
|
goto unlock;
|
|
if (br->mdb && val < br->mdb->size)
|
|
goto unlock;
|
|
|
|
err = 0;
|
|
|
|
old = br->hash_max;
|
|
br->hash_max = val;
|
|
|
|
if (br->mdb) {
|
|
if (br->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;
|
|
}
|