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linux/net/bridge/br_multicast.c

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/*
* Bridge multicast support.
*
* Copyright (c) 2010 Herbert Xu <herbert@gondor.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/export.h>
#include <linux/if_ether.h>
#include <linux/igmp.h>
#include <linux/jhash.h>
#include <linux/kernel.h>
#include <linux/log2.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 <linux/inetdevice.h>
#include <net/ip.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/mld.h>
#include <net/ip6_checksum.h>
#include <net/addrconf.h>
#endif
#include "br_private.h"
static void br_multicast_start_querier(struct net_bridge *br,
struct bridge_mcast_own_query *query);
unsigned int br_mdb_rehash_seq;
static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
{
if (a->proto != b->proto)
return 0;
if (a->vid != b->vid)
return 0;
switch (a->proto) {
case htons(ETH_P_IP):
return a->u.ip4 == b->u.ip4;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
#endif
}
return 0;
}
static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
__u16 vid)
{
return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
}
#if IS_ENABLED(CONFIG_IPV6)
static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
const struct in6_addr *ip,
__u16 vid)
{
return jhash_2words(ipv6_addr_hash(ip), vid,
mdb->secret) & (mdb->max - 1);
}
#endif
static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
struct br_ip *ip)
{
switch (ip->proto) {
case htons(ETH_P_IP):
return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
#endif
}
return 0;
}
static struct net_bridge_mdb_entry *__br_mdb_ip_get(
struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
{
struct net_bridge_mdb_entry *mp;
hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
if (br_ip_equal(&mp->addr, dst))
return mp;
}
return NULL;
}
struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
struct br_ip *dst)
{
if (!mdb)
return NULL;
return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
}
static struct net_bridge_mdb_entry *br_mdb_ip4_get(
struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
{
struct br_ip br_dst;
br_dst.u.ip4 = dst;
br_dst.proto = htons(ETH_P_IP);
br_dst.vid = vid;
return br_mdb_ip_get(mdb, &br_dst);
}
#if IS_ENABLED(CONFIG_IPV6)
static struct net_bridge_mdb_entry *br_mdb_ip6_get(
struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
__u16 vid)
{
struct br_ip br_dst;
br_dst.u.ip6 = *dst;
br_dst.proto = htons(ETH_P_IPV6);
br_dst.vid = vid;
return br_mdb_ip_get(mdb, &br_dst);
}
#endif
struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
struct sk_buff *skb, u16 vid)
{
struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
struct br_ip ip;
if (br->multicast_disabled)
return NULL;
if (BR_INPUT_SKB_CB(skb)->igmp)
return NULL;
ip.proto = skb->protocol;
ip.vid = vid;
switch (skb->protocol) {
case htons(ETH_P_IP):
ip.u.ip4 = ip_hdr(skb)->daddr;
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
ip.u.ip6 = ipv6_hdr(skb)->daddr;
break;
#endif
default:
return NULL;
}
return br_mdb_ip_get(mdb, &ip);
}
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;
int maxlen;
int len;
int i;
for (i = 0; i < old->max; i++)
hlist_for_each_entry(mp, &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, &new->mhash[i], hlist[new->ver])
len++;
if (len > maxlen)
maxlen = len;
}
return maxlen > elasticity ? -EINVAL : 0;
}
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;
mp->mglist = false;
if (mp->ports)
goto out;
mdb = mlock_dereference(br->mdb, br);
hlist_del_rcu(&mp->hlist[mdb->ver]);
mdb->size--;
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;
struct net_bridge_mdb_entry *mp;
struct net_bridge_port_group *p;
struct net_bridge_port_group __rcu **pp;
mdb = mlock_dereference(br->mdb, br);
mp = br_mdb_ip_get(mdb, &pg->addr);
if (WARN_ON(!mp))
return;
for (pp = &mp->ports;
(p = mlock_dereference(*pp, br)) != NULL;
pp = &p->next) {
if (p != pg)
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);
if (!mp->ports && !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) || pg->state & MDB_PERMANENT)
goto out;
br_multicast_del_pg(br, pg);
out:
spin_unlock(&br->multicast_lock);
}
static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
int elasticity)
{
struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
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;
}
br_mdb_rehash_seq++;
call_rcu_bh(&mdb->rcu, br_mdb_free);
out:
rcu_assign_pointer(*mdbp, mdb);
return 0;
}
static struct sk_buff *br_ip4_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);
ether_addr_copy(eth->h_source, br->dev->dev_addr);
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 = br->multicast_query_use_ifaddr ?
inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 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;
}
#if IS_ENABLED(CONFIG_IPV6)
static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
const struct in6_addr *group)
{
struct sk_buff *skb;
struct ipv6hdr *ip6h;
struct mld_msg *mldq;
struct ethhdr *eth;
u8 *hopopt;
unsigned long interval;
skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
8 + sizeof(*mldq));
if (!skb)
goto out;
skb->protocol = htons(ETH_P_IPV6);
/* Ethernet header */
skb_reset_mac_header(skb);
eth = eth_hdr(skb);
ether_addr_copy(eth->h_source, br->dev->dev_addr);
eth->h_proto = htons(ETH_P_IPV6);
skb_put(skb, sizeof(*eth));
/* IPv6 header + HbH option */
skb_set_network_header(skb, skb->len);
ip6h = ipv6_hdr(skb);
*(__force __be32 *)ip6h = htonl(0x60000000);
ip6h->payload_len = htons(8 + sizeof(*mldq));
ip6h->nexthdr = IPPROTO_HOPOPTS;
ip6h->hop_limit = 1;
ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
&ip6h->saddr)) {
kfree_skb(skb);
return NULL;
}
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
hopopt = (u8 *)(ip6h + 1);
hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
hopopt[1] = 0; /* length of HbH */
hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
hopopt[3] = 2; /* Length of RA Option */
hopopt[4] = 0; /* Type = 0x0000 (MLD) */
hopopt[5] = 0;
hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
skb_put(skb, sizeof(*ip6h) + 8);
/* ICMPv6 */
skb_set_transport_header(skb, skb->len);
mldq = (struct mld_msg *) icmp6_hdr(skb);
interval = ipv6_addr_any(group) ?
br->multicast_query_response_interval :
br->multicast_last_member_interval;
mldq->mld_type = ICMPV6_MGM_QUERY;
mldq->mld_code = 0;
mldq->mld_cksum = 0;
mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
mldq->mld_reserved = 0;
mldq->mld_mca = *group;
/* checksum */
mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
sizeof(*mldq), IPPROTO_ICMPV6,
csum_partial(mldq,
sizeof(*mldq), 0));
skb_put(skb, sizeof(*mldq));
__skb_pull(skb, sizeof(*eth));
out:
return skb;
}
#endif
static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
struct br_ip *addr)
{
switch (addr->proto) {
case htons(ETH_P_IP):
return br_ip4_multicast_alloc_query(br, addr->u.ip4);
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
#endif
}
return NULL;
}
static struct net_bridge_mdb_entry *br_multicast_get_group(
struct net_bridge *br, struct net_bridge_port *port,
struct br_ip *group, int hash)
{
struct net_bridge_mdb_htable *mdb;
struct net_bridge_mdb_entry *mp;
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 state)
{
struct net_bridge_port_group *p;
p = kzalloc(sizeof(*p), GFP_ATOMIC);
if (unlikely(!p))
return NULL;
p->addr = *group;
p->port = port;
p->state = state;
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, MDB_TEMPORARY);
if (unlikely(!p))
goto err;
rcu_assign_pointer(*pp, p);
br_mdb_notify(br->dev, port, group, 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 != 1 ||
timer_pending(&port->multicast_router_timer) ||
hlist_unhashed(&port->rlist))
goto out;
hlist_del_init_rcu(&port->rlist);
out:
spin_unlock(&br->multicast_lock);
}
static void br_multicast_local_router_expired(unsigned long data)
{
}
static void br_multicast_querier_expired(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, 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 = 1;
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)
{
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
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)
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->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;
if (!pskb_may_pull(skb, sizeof(*ih)))
return -EINVAL;
ih = igmpv3_report_hdr(skb);
num = ntohs(ih->ngrec);
len = sizeof(*ih);
for (i = 0; i < num; i++) {
len += sizeof(*grec);
if (!pskb_may_pull(skb, len))
return -EINVAL;
grec = (void *)(skb->data + len - sizeof(*grec));
group = grec->grec_mca;
type = grec->grec_type;
len += ntohs(grec->grec_nsrcs) * 4;
if (!pskb_may_pull(skb, len))
return -EINVAL;
/* We treat this as an IGMPv2 report for now. */
switch (type) {
case IGMPV3_MODE_IS_INCLUDE:
case IGMPV3_MODE_IS_EXCLUDE:
case IGMPV3_CHANGE_TO_INCLUDE:
case IGMPV3_CHANGE_TO_EXCLUDE:
case IGMPV3_ALLOW_NEW_SOURCES:
case IGMPV3_BLOCK_OLD_SOURCES:
break;
default:
continue;
}
err = br_ip4_multicast_add_group(br, port, group, 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 = sizeof(*icmp6h);
for (i = 0; i < num; i++) {
__be16 *nsrcs, _nsrcs;
nsrcs = skb_header_pointer(skb,
len + offsetof(struct mld2_grec,
grec_nsrcs),
sizeof(_nsrcs), &_nsrcs);
if (!nsrcs)
return -EINVAL;
if (!pskb_may_pull(skb,
len + sizeof(*grec) +
sizeof(struct in6_addr) * ntohs(*nsrcs)))
return -EINVAL;
grec = (struct mld2_grec *)(skb->data + len);
len += sizeof(*grec) +
sizeof(struct in6_addr) * ntohs(*nsrcs);
/* We treat these as MLDv1 reports for now. */
switch (grec->grec_type) {
case MLD2_MODE_IS_INCLUDE:
case MLD2_MODE_IS_EXCLUDE:
case MLD2_CHANGE_TO_INCLUDE:
case MLD2_CHANGE_TO_EXCLUDE:
case MLD2_ALLOW_NEW_SOURCES:
case MLD2_BLOCK_OLD_SOURCES:
break;
default:
continue;
}
err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
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;
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);
}
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,
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 (!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;
}
/* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
* all-systems destination addresses (224.0.0.1) for general queries
*/
if (!group && iph->daddr != htonl(INADDR_ALLHOSTS_GROUP)) {
err = -EINVAL;
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;
/* RFC2710+RFC3810 (MLDv1+MLDv2) require link-local source addresses */
if (!(ipv6_addr_type(&ip6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
err = -EINVAL;
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);
/* RFC2710+RFC3810 (MLDv1+MLDv2) require the multicast link layer
* all-nodes destination address (ff02::1) for general queries
*/
if (is_general_query && !ipv6_addr_is_ll_all_nodes(&ip6h->daddr)) {
err = -EINVAL;
goto out;
}
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) ||
timer_pending(&other_query->timer))
goto out;
mdb = mlock_dereference(br->mdb, br);
mp = br_mdb_ip_get(mdb, group);
if (!mp)
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;
}
}
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, port, group, RTM_DELMDB);
if (!mp->ports && !mp->mglist &&
netif_running(br->dev))
mod_timer(&mp->timer, jiffies);
}
goto out;
}
now = jiffies;
time = now + br->multicast_last_member_count *
br->multicast_last_member_interval;
if (!port) {
if (mp->mglist &&
(timer_pending(&mp->timer) ?
time_after(mp->timer.expires, time) :
try_to_del_timer_sync(&mp->timer) >= 0)) {
mod_timer(&mp->timer, time);
}
goto out;
}
for (p = mlock_dereference(mp->ports, br);
p != NULL;
p = mlock_dereference(p->next, br)) {
if (p->port != port)
continue;
if (!hlist_unhashed(&p->mglist) &&
(timer_pending(&p->timer) ?
time_after(p->timer.expires, time) :
try_to_del_timer_sync(&p->timer) >= 0)) {
mod_timer(&p->timer, time);
}
break;
}
out:
spin_unlock(&br->multicast_lock);
}
static void br_ip4_multicast_leave_group(struct net_bridge *br,
struct net_bridge_port *port,
__be32 group,
__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 *skb2 = skb;
const struct iphdr *iph;
struct igmphdr *ih;
unsigned int len;
unsigned int offset;
int err;
/* We treat OOM as packet loss for now. */
if (!pskb_may_pull(skb, sizeof(*iph)))
return -EINVAL;
iph = ip_hdr(skb);
if (iph->ihl < 5 || iph->version != 4)
return -EINVAL;
if (!pskb_may_pull(skb, ip_hdrlen(skb)))
return -EINVAL;
iph = ip_hdr(skb);
if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
return -EINVAL;
if (iph->protocol != IPPROTO_IGMP) {
if (!ipv4_is_local_multicast(iph->daddr))
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
return 0;
}
len = ntohs(iph->tot_len);
if (skb->len < len || len < ip_hdrlen(skb))
return -EINVAL;
if (skb->len > len) {
skb2 = skb_clone(skb, GFP_ATOMIC);
if (!skb2)
return -ENOMEM;
err = pskb_trim_rcsum(skb2, len);
if (err)
goto err_out;
}
len -= ip_hdrlen(skb2);
offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
__skb_pull(skb2, offset);
skb_reset_transport_header(skb2);
err = -EINVAL;
if (!pskb_may_pull(skb2, sizeof(*ih)))
goto out;
switch (skb2->ip_summed) {
case CHECKSUM_COMPLETE:
if (!csum_fold(skb2->csum))
break;
/* fall through */
case CHECKSUM_NONE:
skb2->csum = 0;
if (skb_checksum_complete(skb2))
goto out;
}
err = 0;
BR_INPUT_SKB_CB(skb)->igmp = 1;
ih = igmp_hdr(skb2);
switch (ih->type) {
case IGMP_HOST_MEMBERSHIP_REPORT:
case IGMPV2_HOST_MEMBERSHIP_REPORT:
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
err = br_ip4_multicast_add_group(br, port, ih->group, vid);
break;
case IGMPV3_HOST_MEMBERSHIP_REPORT:
err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
break;
case IGMP_HOST_MEMBERSHIP_QUERY:
err = br_ip4_multicast_query(br, port, skb2, vid);
break;
case IGMP_HOST_LEAVE_MESSAGE:
br_ip4_multicast_leave_group(br, port, ih->group, vid);
break;
}
out:
__skb_push(skb2, offset);
err_out:
if (skb2 != skb)
kfree_skb(skb2);
return err;
}
#if IS_ENABLED(CONFIG_IPV6)
static int br_multicast_ipv6_rcv(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb,
u16 vid)
{
struct sk_buff *skb2;
const struct ipv6hdr *ip6h;
u8 icmp6_type;
u8 nexthdr;
__be16 frag_off;
unsigned int len;
int offset;
int err;
if (!pskb_may_pull(skb, sizeof(*ip6h)))
return -EINVAL;
ip6h = ipv6_hdr(skb);
/*
* We're interested in MLD messages only.
* - Version is 6
* - MLD has always Router Alert hop-by-hop option
* - But we do not support jumbrograms.
*/
if (ip6h->version != 6)
return 0;
/* Prevent flooding this packet if there is no listener present */
if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
ip6h->payload_len == 0)
return 0;
len = ntohs(ip6h->payload_len) + sizeof(*ip6h);
if (skb->len < len)
return -EINVAL;
nexthdr = ip6h->nexthdr;
offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off);
if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
return 0;
/* Okay, we found ICMPv6 header */
skb2 = skb_clone(skb, GFP_ATOMIC);
if (!skb2)
return -ENOMEM;
err = -EINVAL;
if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
goto out;
len -= offset - skb_network_offset(skb2);
__skb_pull(skb2, offset);
skb_reset_transport_header(skb2);
skb_postpull_rcsum(skb2, skb_network_header(skb2),
skb_network_header_len(skb2));
icmp6_type = icmp6_hdr(skb2)->icmp6_type;
switch (icmp6_type) {
case ICMPV6_MGM_QUERY:
case ICMPV6_MGM_REPORT:
case ICMPV6_MGM_REDUCTION:
case ICMPV6_MLD2_REPORT:
break;
default:
err = 0;
goto out;
}
/* Okay, we found MLD message. Check further. */
if (skb2->len > len) {
err = pskb_trim_rcsum(skb2, len);
if (err)
goto out;
err = -EINVAL;
}
ip6h = ipv6_hdr(skb2);
switch (skb2->ip_summed) {
case CHECKSUM_COMPLETE:
if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len,
IPPROTO_ICMPV6, skb2->csum))
break;
/*FALLTHROUGH*/
case CHECKSUM_NONE:
skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr,
&ip6h->daddr,
skb2->len,
IPPROTO_ICMPV6, 0));
if (__skb_checksum_complete(skb2))
goto out;
}
err = 0;
BR_INPUT_SKB_CB(skb)->igmp = 1;
switch (icmp6_type) {
case ICMPV6_MGM_REPORT:
{
struct mld_msg *mld;
if (!pskb_may_pull(skb2, sizeof(*mld))) {
err = -EINVAL;
goto out;
}
mld = (struct mld_msg *)skb_transport_header(skb2);
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
break;
}
case ICMPV6_MLD2_REPORT:
err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
break;
case ICMPV6_MGM_QUERY:
err = br_ip6_multicast_query(br, port, skb2, vid);
break;
case ICMPV6_MGM_REDUCTION:
{
struct mld_msg *mld;
if (!pskb_may_pull(skb2, sizeof(*mld))) {
err = -EINVAL;
goto out;
}
mld = (struct mld_msg *)skb_transport_header(skb2);
br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
}
}
out:
kfree_skb(skb2);
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, 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 = 1;
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)
{
struct net_bridge_mdb_htable *mdb;
struct net_bridge_mdb_entry *mp;
struct hlist_node *n;
u32 ver;
int i;
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
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 = -ENOENT;
spin_lock_bh(&br->multicast_lock);
if (!netif_running(br->dev))
goto unlock;
switch (val) {
case 0:
case 2:
del_timer(&br->multicast_router_timer);
/* fall through */
case 1:
br->multicast_router = val;
err = 0;
break;
default:
err = -EINVAL;
break;
}
unlock:
spin_unlock_bh(&br->multicast_lock);
return err;
}
int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
{
struct net_bridge *br = p->br;
int err = -ENOENT;
spin_lock(&br->multicast_lock);
if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
goto unlock;
switch (val) {
case 0:
case 1:
case 2:
p->multicast_router = val;
err = 0;
if (val < 2 && !hlist_unhashed(&p->rlist))
hlist_del_init_rcu(&p->rlist);
if (val == 1)
break;
del_timer(&p->multicast_router_timer);
if (val == 0)
break;
br_multicast_add_router(br, p);
break;
default:
err = -EINVAL;
break;
}
unlock:
spin_unlock(&br->multicast_lock);
return err;
}
static void br_multicast_start_querier(struct net_bridge *br,
struct 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 = -ENOENT;
u32 old;
struct net_bridge_mdb_htable *mdb;
spin_lock_bh(&br->multicast_lock);
if (!netif_running(br->dev))
goto unlock;
err = -EINVAL;
if (!is_power_of_2(val))
goto unlock;
mdb = mlock_dereference(br->mdb, br);
if (mdb && val < mdb->size)
goto unlock;
err = 0;
old = br->hash_max;
br->hash_max = val;
if (mdb) {
if (mdb->old) {
err = -EEXIST;
rollback:
br->hash_max = old;
goto unlock;
}
err = br_mdb_rehash(&br->mdb, br->hash_max,
br->hash_elasticity);
if (err)
goto rollback;
}
unlock:
spin_unlock_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(&eth, 0, sizeof(eth));
eth.h_proto = htons(proto);
ret = br_multicast_querier_exists(br, &eth);
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);
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