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Message-Id: <E1NlbuT-00021C-0b@gondolin.me.apana.org.au>
Date: Sun, 28 Feb 2010 13:41:45 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
Stephen Hemminger <shemminger@...tta.com>
Subject: [PATCH 6/13] bridge: Add core IGMP snooping support
bridge: Add core IGMP snooping support
This patch adds the core functionality of IGMP snooping support
without actually hooking it up. So this patch should be a no-op
as far as the bridge's external behaviour is concerned.
All the new code and data is controlled by the Kconfig option
BRIDGE_IGMP_SNOOPING. A run-time toggle is also available.
The multicast switching is done using an hash table that is
lockless on the read-side through RCU. On the write-side the
new multicast_lock is used for all operations. The hash table
supports dynamic growth/rehashing.
The hash table will be rehashed if any chain length exceeds a
preset limit. If rehashing does not reduce the maximum chain
length then snooping will be disabled.
These features may be added in future (in no particular order):
* IGMPv3 source support
* Non-querier router detection
* IPv6
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
---
net/bridge/Kconfig | 12
net/bridge/Makefile | 2
net/bridge/br_multicast.c | 1135 ++++++++++++++++++++++++++++++++++++++++++++++
net/bridge/br_private.h | 139 +++++
4 files changed, 1288 insertions(+)
diff --git a/net/bridge/Kconfig b/net/bridge/Kconfig
index e143ca6..78dd549 100644
--- a/net/bridge/Kconfig
+++ b/net/bridge/Kconfig
@@ -31,3 +31,15 @@ config BRIDGE
will be called bridge.
If unsure, say N.
+
+config BRIDGE_IGMP_SNOOPING
+ bool "IGMP snooping"
+ default y
+ ---help---
+ If you say Y here, then the Ethernet bridge will be able selectively
+ forward multicast traffic based on IGMP traffic received from each
+ port.
+
+ Say N to exclude this support and reduce the binary size.
+
+ If unsure, say Y.
diff --git a/net/bridge/Makefile b/net/bridge/Makefile
index f444c12..d0359ea 100644
--- a/net/bridge/Makefile
+++ b/net/bridge/Makefile
@@ -12,4 +12,6 @@ bridge-$(CONFIG_SYSFS) += br_sysfs_if.o br_sysfs_br.o
bridge-$(CONFIG_BRIDGE_NETFILTER) += br_netfilter.o
+bridge-$(CONFIG_BRIDGE_IGMP_SNOOPING) += br_multicast.o
+
obj-$(CONFIG_BRIDGE_NF_EBTABLES) += netfilter/
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
new file mode 100644
index 0000000..746b5a6
--- /dev/null
+++ b/net/bridge/br_multicast.c
@@ -0,0 +1,1135 @@
+/*
+ * Bridge multicast support.
+ *
+ * Copyright (c) 2010 Herbert Xu <herbert@...dor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/if_ether.h>
+#include <linux/igmp.h>
+#include <linux/jhash.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/random.h>
+#include <linux/rculist.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <net/ip.h>
+
+#include "br_private.h"
+
+static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
+{
+ return jhash_1word(mdb->secret, (u32)ip) & (mdb->max - 1);
+}
+
+static struct net_bridge_mdb_entry *__br_mdb_ip_get(
+ struct net_bridge_mdb_htable *mdb, __be32 dst, int hash)
+{
+ struct net_bridge_mdb_entry *mp;
+ struct hlist_node *p;
+
+ hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
+ if (dst == mp->addr)
+ return mp;
+ }
+
+ return NULL;
+}
+
+static struct net_bridge_mdb_entry *br_mdb_ip_get(
+ struct net_bridge_mdb_htable *mdb, __be32 dst)
+{
+ return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
+}
+
+struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
+ struct sk_buff *skb)
+{
+ struct net_bridge_mdb_htable *mdb = br->mdb;
+
+ if (!mdb || br->multicast_disabled)
+ return NULL;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ if (BR_INPUT_SKB_CB(skb)->igmp)
+ break;
+ return br_mdb_ip_get(mdb, ip_hdr(skb)->daddr);
+ }
+
+ return NULL;
+}
+
+static void br_mdb_free(struct rcu_head *head)
+{
+ struct net_bridge_mdb_htable *mdb =
+ container_of(head, struct net_bridge_mdb_htable, rcu);
+ struct net_bridge_mdb_htable *old = mdb->old;
+
+ mdb->old = NULL;
+ kfree(old->mhash);
+ kfree(old);
+}
+
+static int br_mdb_copy(struct net_bridge_mdb_htable *new,
+ struct net_bridge_mdb_htable *old,
+ int elasticity)
+{
+ struct net_bridge_mdb_entry *mp;
+ struct hlist_node *p;
+ int maxlen;
+ int len;
+ int i;
+
+ for (i = 0; i < old->max; i++)
+ hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
+ hlist_add_head(&mp->hlist[new->ver],
+ &new->mhash[br_ip_hash(new, mp->addr)]);
+
+ if (!elasticity)
+ return 0;
+
+ maxlen = 0;
+ for (i = 0; i < new->max; i++) {
+ len = 0;
+ hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
+ len++;
+ if (len > maxlen)
+ maxlen = len;
+ }
+
+ return maxlen > elasticity ? -EINVAL : 0;
+}
+
+static void br_multicast_free_pg(struct rcu_head *head)
+{
+ struct net_bridge_port_group *p =
+ container_of(head, struct net_bridge_port_group, rcu);
+
+ kfree(p);
+}
+
+static void br_multicast_free_group(struct rcu_head *head)
+{
+ struct net_bridge_mdb_entry *mp =
+ container_of(head, struct net_bridge_mdb_entry, rcu);
+
+ kfree(mp);
+}
+
+static void br_multicast_group_expired(unsigned long data)
+{
+ struct net_bridge_mdb_entry *mp = (void *)data;
+ struct net_bridge *br = mp->br;
+ struct net_bridge_mdb_htable *mdb;
+
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) || timer_pending(&mp->timer))
+ goto out;
+
+ if (!hlist_unhashed(&mp->mglist))
+ hlist_del_init(&mp->mglist);
+
+ if (mp->ports)
+ goto out;
+
+ mdb = br->mdb;
+ hlist_del_rcu(&mp->hlist[mdb->ver]);
+ mdb->size--;
+
+ del_timer(&mp->query_timer);
+ call_rcu_bh(&mp->rcu, br_multicast_free_group);
+
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static void br_multicast_del_pg(struct net_bridge *br,
+ struct net_bridge_port_group *pg)
+{
+ struct net_bridge_mdb_htable *mdb = br->mdb;
+ struct net_bridge_mdb_entry *mp;
+ struct net_bridge_port_group *p;
+ struct net_bridge_port_group **pp;
+
+ mp = br_mdb_ip_get(mdb, pg->addr);
+ if (WARN_ON(!mp))
+ return;
+
+ for (pp = &mp->ports; (p = *pp); pp = &p->next) {
+ if (p != pg)
+ continue;
+
+ *pp = p->next;
+ hlist_del_init(&p->mglist);
+ del_timer(&p->timer);
+ del_timer(&p->query_timer);
+ call_rcu_bh(&p->rcu, br_multicast_free_pg);
+
+ if (!mp->ports && hlist_unhashed(&mp->mglist) &&
+ netif_running(br->dev))
+ mod_timer(&mp->timer, jiffies);
+
+ return;
+ }
+
+ WARN_ON(1);
+}
+
+static void br_multicast_port_group_expired(unsigned long data)
+{
+ struct net_bridge_port_group *pg = (void *)data;
+ struct net_bridge *br = pg->port->br;
+
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
+ hlist_unhashed(&pg->mglist))
+ goto out;
+
+ br_multicast_del_pg(br, pg);
+
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max,
+ int elasticity)
+{
+ struct net_bridge_mdb_htable *old = *mdbp;
+ struct net_bridge_mdb_htable *mdb;
+ int err;
+
+ mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
+ if (!mdb)
+ return -ENOMEM;
+
+ mdb->max = max;
+ mdb->old = old;
+
+ mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
+ if (!mdb->mhash) {
+ kfree(mdb);
+ return -ENOMEM;
+ }
+
+ mdb->size = old ? old->size : 0;
+ mdb->ver = old ? old->ver ^ 1 : 0;
+
+ if (!old || elasticity)
+ get_random_bytes(&mdb->secret, sizeof(mdb->secret));
+ else
+ mdb->secret = old->secret;
+
+ if (!old)
+ goto out;
+
+ err = br_mdb_copy(mdb, old, elasticity);
+ if (err) {
+ kfree(mdb->mhash);
+ kfree(mdb);
+ return err;
+ }
+
+ call_rcu_bh(&mdb->rcu, br_mdb_free);
+
+out:
+ rcu_assign_pointer(*mdbp, mdb);
+
+ return 0;
+}
+
+static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
+ __be32 group)
+{
+ struct sk_buff *skb;
+ struct igmphdr *ih;
+ struct ethhdr *eth;
+ struct iphdr *iph;
+
+ skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
+ sizeof(*ih) + 4);
+ if (!skb)
+ goto out;
+
+ skb->protocol = htons(ETH_P_IP);
+
+ skb_reset_mac_header(skb);
+ eth = eth_hdr(skb);
+
+ memcpy(eth->h_source, br->dev->dev_addr, 6);
+ eth->h_dest[0] = 1;
+ eth->h_dest[1] = 0;
+ eth->h_dest[2] = 0x5e;
+ eth->h_dest[3] = 0;
+ eth->h_dest[4] = 0;
+ eth->h_dest[5] = 1;
+ eth->h_proto = htons(ETH_P_IP);
+ skb_put(skb, sizeof(*eth));
+
+ skb_set_network_header(skb, skb->len);
+ iph = ip_hdr(skb);
+
+ iph->version = 4;
+ iph->ihl = 6;
+ iph->tos = 0xc0;
+ iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
+ iph->id = 0;
+ iph->frag_off = htons(IP_DF);
+ iph->ttl = 1;
+ iph->protocol = IPPROTO_IGMP;
+ iph->saddr = 0;
+ iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
+ ((u8 *)&iph[1])[0] = IPOPT_RA;
+ ((u8 *)&iph[1])[1] = 4;
+ ((u8 *)&iph[1])[2] = 0;
+ ((u8 *)&iph[1])[3] = 0;
+ ip_send_check(iph);
+ skb_put(skb, 24);
+
+ skb_set_transport_header(skb, skb->len);
+ ih = igmp_hdr(skb);
+ ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
+ ih->code = (group ? br->multicast_last_member_interval :
+ br->multicast_query_response_interval) /
+ (HZ / IGMP_TIMER_SCALE);
+ ih->group = group;
+ ih->csum = 0;
+ ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
+ skb_put(skb, sizeof(*ih));
+
+ __skb_pull(skb, sizeof(*eth));
+
+out:
+ return skb;
+}
+
+static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
+{
+ struct net_bridge *br = mp->br;
+ struct sk_buff *skb;
+
+ skb = br_multicast_alloc_query(br, mp->addr);
+ if (!skb)
+ goto timer;
+
+ netif_rx(skb);
+
+timer:
+ if (++mp->queries_sent < br->multicast_last_member_count)
+ mod_timer(&mp->query_timer,
+ jiffies + br->multicast_last_member_interval);
+}
+
+static void br_multicast_group_query_expired(unsigned long data)
+{
+ struct net_bridge_mdb_entry *mp = (void *)data;
+ struct net_bridge *br = mp->br;
+
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
+ mp->queries_sent >= br->multicast_last_member_count)
+ goto out;
+
+ br_multicast_send_group_query(mp);
+
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
+{
+ struct net_bridge_port *port = pg->port;
+ struct net_bridge *br = port->br;
+ struct sk_buff *skb;
+
+ skb = br_multicast_alloc_query(br, pg->addr);
+ if (!skb)
+ goto timer;
+
+ br_deliver(port, skb);
+
+timer:
+ if (++pg->queries_sent < br->multicast_last_member_count)
+ mod_timer(&pg->query_timer,
+ jiffies + br->multicast_last_member_interval);
+}
+
+static void br_multicast_port_group_query_expired(unsigned long data)
+{
+ struct net_bridge_port_group *pg = (void *)data;
+ struct net_bridge_port *port = pg->port;
+ struct net_bridge *br = port->br;
+
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
+ pg->queries_sent >= br->multicast_last_member_count)
+ goto out;
+
+ br_multicast_send_port_group_query(pg);
+
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static struct net_bridge_mdb_entry *br_multicast_get_group(
+ struct net_bridge *br, struct net_bridge_port *port, __be32 group,
+ int hash)
+{
+ struct net_bridge_mdb_htable *mdb = br->mdb;
+ struct net_bridge_mdb_entry *mp;
+ struct hlist_node *p;
+ unsigned count = 0;
+ unsigned max;
+ int elasticity;
+ int err;
+
+ hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
+ count++;
+ if (unlikely(group == mp->addr)) {
+ return mp;
+ }
+ }
+
+ elasticity = 0;
+ max = mdb->max;
+
+ if (unlikely(count > br->hash_elasticity && count)) {
+ if (net_ratelimit())
+ printk(KERN_INFO "%s: Multicast hash table "
+ "chain limit reached: %s\n",
+ br->dev->name, port ? port->dev->name :
+ br->dev->name);
+
+ elasticity = br->hash_elasticity;
+ }
+
+ if (mdb->size >= max) {
+ max *= 2;
+ if (unlikely(max >= br->hash_max)) {
+ printk(KERN_WARNING "%s: Multicast hash table maximum "
+ "reached, disabling snooping: %s, %d\n",
+ br->dev->name, port ? port->dev->name :
+ br->dev->name,
+ max);
+ err = -E2BIG;
+disable:
+ br->multicast_disabled = 1;
+ goto err;
+ }
+ }
+
+ if (max > mdb->max || elasticity) {
+ if (mdb->old) {
+ if (net_ratelimit())
+ printk(KERN_INFO "%s: Multicast hash table "
+ "on fire: %s\n",
+ br->dev->name, port ? port->dev->name :
+ br->dev->name);
+ err = -EEXIST;
+ goto err;
+ }
+
+ err = br_mdb_rehash(&br->mdb, max, elasticity);
+ if (err) {
+ printk(KERN_WARNING "%s: Cannot rehash multicast "
+ "hash table, disabling snooping: "
+ "%s, %d, %d\n",
+ br->dev->name, port ? port->dev->name :
+ br->dev->name,
+ mdb->size, err);
+ goto disable;
+ }
+
+ err = -EAGAIN;
+ goto err;
+ }
+
+ return NULL;
+
+err:
+ mp = ERR_PTR(err);
+ return mp;
+}
+
+static struct net_bridge_mdb_entry *br_multicast_new_group(
+ struct net_bridge *br, struct net_bridge_port *port, __be32 group)
+{
+ struct net_bridge_mdb_htable *mdb = br->mdb;
+ struct net_bridge_mdb_entry *mp;
+ int hash;
+
+ if (!mdb) {
+ if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0))
+ return NULL;
+ 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 = br->mdb;
+ hash = br_ip_hash(mdb, group);
+ break;
+
+ default:
+ goto out;
+ }
+
+ mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
+ if (unlikely(!mp))
+ goto out;
+
+ mp->br = br;
+ mp->addr = group;
+ setup_timer(&mp->timer, br_multicast_group_expired,
+ (unsigned long)mp);
+ setup_timer(&mp->query_timer, br_multicast_group_query_expired,
+ (unsigned long)mp);
+
+ hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
+ mdb->size++;
+
+out:
+ return mp;
+}
+
+static int br_multicast_add_group(struct net_bridge *br,
+ struct net_bridge_port *port, __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 && (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);
+}
+
+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;
+
+ 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);
+
+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);
+ group = grec->grec_mca;
+ type = grec->grec_type;
+
+ len += 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_mark_router(struct net_bridge *br,
+ struct net_bridge_port *port)
+{
+ unsigned long now = jiffies;
+ struct hlist_node *p;
+ struct hlist_node **h;
+
+ 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;
+
+ 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;
+
+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;
+
+ 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)))
+ return -EINVAL;
+
+ ih3 = igmpv3_query_hdr(skb);
+ if (ih3->nsrcs)
+ return 0;
+
+ max_delay = ih3->code ? 1 :
+ IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE);
+ }
+
+ 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 0;
+}
+
+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;
+
+ BR_INPUT_SKB_CB(skb)->igmp = 0;
+ BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
+
+ /* 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)
+ return err;
+ }
+
+ 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))
+ return -EINVAL;
+ }
+
+ 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);
+ 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)
+{
+ 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);
+ synchronize_rcu_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);
+}
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 7b0aed5..0871775 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -57,6 +57,41 @@ struct net_bridge_fdb_entry
unsigned char is_static;
};
+struct net_bridge_port_group {
+ struct net_bridge_port *port;
+ struct net_bridge_port_group *next;
+ struct hlist_node mglist;
+ struct rcu_head rcu;
+ struct timer_list timer;
+ struct timer_list query_timer;
+ __be32 addr;
+ u32 queries_sent;
+};
+
+struct net_bridge_mdb_entry
+{
+ struct hlist_node hlist[2];
+ struct hlist_node mglist;
+ struct net_bridge *br;
+ struct net_bridge_port_group *ports;
+ struct rcu_head rcu;
+ struct timer_list timer;
+ struct timer_list query_timer;
+ __be32 addr;
+ u32 queries_sent;
+};
+
+struct net_bridge_mdb_htable
+{
+ struct hlist_head *mhash;
+ struct rcu_head rcu;
+ struct net_bridge_mdb_htable *old;
+ u32 size;
+ u32 max;
+ u32 secret;
+ u32 ver;
+};
+
struct net_bridge_port
{
struct net_bridge *br;
@@ -84,6 +119,15 @@ struct net_bridge_port
unsigned long flags;
#define BR_HAIRPIN_MODE 0x00000001
+
+#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+ u32 multicast_startup_queries_sent;
+ unsigned char multicast_router;
+ struct timer_list multicast_router_timer;
+ struct timer_list multicast_query_timer;
+ struct hlist_head mglist;
+ struct hlist_node rlist;
+#endif
};
struct net_bridge
@@ -125,6 +169,35 @@ struct net_bridge
unsigned char topology_change;
unsigned char topology_change_detected;
+#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+ unsigned char multicast_router;
+
+ u8 multicast_disabled:1;
+
+ u32 hash_elasticity;
+ u32 hash_max;
+
+ u32 multicast_last_member_count;
+ u32 multicast_startup_queries_sent;
+ u32 multicast_startup_query_count;
+
+ unsigned long multicast_last_member_interval;
+ unsigned long multicast_membership_interval;
+ unsigned long multicast_querier_interval;
+ unsigned long multicast_query_interval;
+ unsigned long multicast_query_response_interval;
+ unsigned long multicast_startup_query_interval;
+
+ spinlock_t multicast_lock;
+ struct net_bridge_mdb_htable *mdb;
+ struct hlist_head router_list;
+ struct hlist_head mglist;
+
+ struct timer_list multicast_router_timer;
+ struct timer_list multicast_querier_timer;
+ struct timer_list multicast_query_timer;
+#endif
+
struct timer_list hello_timer;
struct timer_list tcn_timer;
struct timer_list topology_change_timer;
@@ -134,6 +207,8 @@ struct net_bridge
struct br_input_skb_cb {
struct net_device *brdev;
+ int igmp;
+ int mrouters_only;
};
#define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
@@ -205,6 +280,70 @@ extern struct sk_buff *br_handle_frame(struct net_bridge_port *p,
extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
+/* br_multicast.c */
+#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+extern int br_multicast_rcv(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct sk_buff *skb);
+extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
+ struct sk_buff *skb);
+extern void br_multicast_add_port(struct net_bridge_port *port);
+extern void br_multicast_del_port(struct net_bridge_port *port);
+extern void br_multicast_enable_port(struct net_bridge_port *port);
+extern void br_multicast_disable_port(struct net_bridge_port *port);
+extern void br_multicast_init(struct net_bridge *br);
+extern void br_multicast_open(struct net_bridge *br);
+extern void br_multicast_stop(struct net_bridge *br);
+#else
+static inline int br_multicast_rcv(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct sk_buff *skb)
+{
+ return 0;
+}
+
+static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
+ struct sk_buff *skb)
+{
+ return NULL;
+}
+
+static inline void br_multicast_add_port(struct net_bridge_port *port)
+{
+}
+
+static inline void br_multicast_del_port(struct net_bridge_port *port)
+{
+}
+
+static inline void br_multicast_enable_port(struct net_bridge_port *port)
+{
+}
+
+static inline void br_multicast_disable_port(struct net_bridge_port *port)
+{
+}
+
+static inline void br_multicast_init(struct net_bridge *br)
+{
+}
+
+static inline void br_multicast_open(struct net_bridge *br)
+{
+}
+
+static inline void br_multicast_stop(struct net_bridge *br)
+{
+}
+#endif
+
+static inline bool br_multicast_is_router(struct net_bridge *br)
+{
+ return br->multicast_router == 2 ||
+ (br->multicast_router == 1 &&
+ timer_pending(&br->multicast_router_timer));
+}
+
/* br_netfilter.c */
#ifdef CONFIG_BRIDGE_NETFILTER
extern int br_netfilter_init(void);
--
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