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Diffstat (limited to 'net/bridge/br_multicast.c')
-rw-r--r--net/bridge/br_multicast.c685
1 files changed, 551 insertions, 134 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 6d6f26531de..abfa0b65a11 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -11,6 +11,7 @@
*/
#include <linux/err.h>
+#include <linux/export.h>
#include <linux/if_ether.h>
#include <linux/igmp.h>
#include <linux/jhash.h>
@@ -23,22 +24,27 @@
#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);
+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;
@@ -50,16 +56,19 @@ static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
return 0;
}
-static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
+static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
+ __u16 vid)
{
- return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
+ 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)
+ const struct in6_addr *ip,
+ __u16 vid)
{
- return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
+ return jhash_2words(ipv6_addr_hash(ip), vid,
+ mdb->secret) & (mdb->max - 1);
}
#endif
@@ -68,10 +77,10 @@ static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
{
switch (ip->proto) {
case htons(ETH_P_IP):
- return __br_ip4_hash(mdb, ip->u.ip4);
+ 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);
+ return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
#endif
}
return 0;
@@ -81,9 +90,8 @@ 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;
- struct hlist_node *p;
- hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
+ hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
if (br_ip_equal(&mp->addr, dst))
return mp;
}
@@ -101,31 +109,34 @@ struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
}
static struct net_bridge_mdb_entry *br_mdb_ip4_get(
- struct net_bridge_mdb_htable *mdb, __be32 dst)
+ 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)
+ 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)
+ struct sk_buff *skb, u16 vid)
{
struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
struct br_ip ip;
@@ -137,6 +148,7 @@ struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
return NULL;
ip.proto = skb->protocol;
+ ip.vid = vid;
switch (skb->protocol) {
case htons(ETH_P_IP):
@@ -170,13 +182,12 @@ static int br_mdb_copy(struct net_bridge_mdb_htable *new,
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_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)]);
@@ -186,7 +197,7 @@ static int br_mdb_copy(struct net_bridge_mdb_htable *new,
maxlen = 0;
for (i = 0; i < new->max; i++) {
len = 0;
- hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
+ hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
len++;
if (len > maxlen)
maxlen = len;
@@ -353,7 +364,7 @@ static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
skb_reset_mac_header(skb);
eth = eth_hdr(skb);
- memcpy(eth->h_source, br->dev->dev_addr, 6);
+ 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;
@@ -374,7 +385,8 @@ static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
iph->frag_off = htons(IP_DF);
iph->ttl = 1;
iph->protocol = IPPROTO_IGMP;
- iph->saddr = 0;
+ 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;
@@ -422,7 +434,7 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
skb_reset_mac_header(skb);
eth = eth_hdr(skb);
- memcpy(eth->h_source, br->dev->dev_addr, 6);
+ ether_addr_copy(eth->h_source, br->dev->dev_addr);
eth->h_proto = htons(ETH_P_IPV6);
skb_put(skb, sizeof(*eth));
@@ -458,8 +470,9 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
skb_set_transport_header(skb, skb->len);
mldq = (struct mld_msg *) icmp6_hdr(skb);
- interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
- br->multicast_query_response_interval;
+ 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;
@@ -502,14 +515,13 @@ static struct net_bridge_mdb_entry *br_multicast_get_group(
{
struct net_bridge_mdb_htable *mdb;
struct net_bridge_mdb_entry *mp;
- struct hlist_node *p;
unsigned int count = 0;
unsigned int max;
int elasticity;
int err;
mdb = rcu_dereference_protected(br->mdb, 1);
- hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
+ hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
count++;
if (unlikely(br_ip_equal(group, &mp->addr)))
return mp;
@@ -694,7 +706,8 @@ err:
static int br_ip4_multicast_add_group(struct net_bridge *br,
struct net_bridge_port *port,
- __be32 group)
+ __be32 group,
+ __u16 vid)
{
struct br_ip br_group;
@@ -703,6 +716,7 @@ static int br_ip4_multicast_add_group(struct net_bridge *br,
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);
}
@@ -710,15 +724,17 @@ static int br_ip4_multicast_add_group(struct net_bridge *br,
#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)
+ const struct in6_addr *group,
+ __u16 vid)
{
struct br_ip br_group;
- if (!ipv6_is_transient_multicast(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);
}
@@ -745,20 +761,47 @@ static void br_multicast_local_router_expired(unsigned long data)
{
}
-static void br_multicast_querier_expired(unsigned long data)
+static void br_multicast_querier_expired(struct net_bridge *br,
+ struct bridge_mcast_own_query *query)
{
- struct net_bridge *br = (void *)data;
-
spin_lock(&br->multicast_lock);
if (!netif_running(br->dev) || br->multicast_disabled)
goto out;
- br_multicast_start_querier(br);
+ 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)
@@ -774,42 +817,53 @@ static void __br_multicast_send_query(struct net_bridge *br,
skb->dev = port->dev;
NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
dev_queue_xmit);
- } else
+ } 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, u32 sent)
+ 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 ||
- timer_pending(&br->multicast_querier_timer))
+ !br->multicast_querier)
return;
memset(&br_group.u, 0, sizeof(br_group.u));
- br_group.proto = htons(ETH_P_IP);
- __br_multicast_send_query(br, port, &br_group);
-
+ if (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)
- br_group.proto = htons(ETH_P_IPV6);
- __br_multicast_send_query(br, port, &br_group);
+ } 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 += sent < br->multicast_startup_query_count ?
+ time += own_query->startup_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);
+ mod_timer(&own_query->timer, time);
}
-static void br_multicast_port_query_expired(unsigned long data)
+static void
+br_multicast_port_query_expired(struct net_bridge_port *port,
+ struct bridge_mcast_own_query *query)
{
- struct net_bridge_port *port = (void *)data;
struct net_bridge *br = port->br;
spin_lock(&br->multicast_lock);
@@ -817,25 +871,43 @@ static void br_multicast_port_query_expired(unsigned long data)
port->state == BR_STATE_BLOCKING)
goto out;
- if (port->multicast_startup_queries_sent <
- br->multicast_startup_query_count)
- port->multicast_startup_queries_sent++;
+ if (query->startup_sent < br->multicast_startup_query_count)
+ query->startup_sent++;
- br_multicast_send_query(port->br, port,
- port->multicast_startup_queries_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->multicast_query_timer,
- br_multicast_port_query_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)
@@ -843,13 +915,13 @@ 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)
+static void br_multicast_enable(struct bridge_mcast_own_query *query)
{
- port->multicast_startup_queries_sent = 0;
+ query->startup_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);
+ 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)
@@ -860,7 +932,10 @@ void br_multicast_enable_port(struct net_bridge_port *port)
if (br->multicast_disabled || !netif_running(br->dev))
goto out;
- __br_multicast_enable_port(port);
+ 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);
@@ -870,22 +945,26 @@ 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;
+ struct hlist_node *n;
spin_lock(&br->multicast_lock);
- hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
+ 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->multicast_query_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)
+ struct sk_buff *skb,
+ u16 vid)
{
struct igmpv3_report *ih;
struct igmpv3_grec *grec;
@@ -930,7 +1009,7 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
continue;
}
- err = br_ip4_multicast_add_group(br, port, group);
+ err = br_ip4_multicast_add_group(br, port, group, vid);
if (err)
break;
}
@@ -941,7 +1020,8 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
#if IS_ENABLED(CONFIG_IPV6)
static int br_ip6_multicast_mld2_report(struct net_bridge *br,
struct net_bridge_port *port,
- struct sk_buff *skb)
+ struct sk_buff *skb,
+ u16 vid)
{
struct icmp6hdr *icmp6h;
struct mld2_grec *grec;
@@ -990,7 +1070,8 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
continue;
}
- err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
+ err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
+ vid);
if (!err)
break;
}
@@ -999,8 +1080,84 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
}
#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 rotuer_list
+ * Add port to router_list
* list is maintained ordered by pointer value
* and locked by br->multicast_lock and RCU
*/
@@ -1008,12 +1165,12 @@ static void br_multicast_add_router(struct net_bridge *br,
struct net_bridge_port *port)
{
struct net_bridge_port *p;
- struct hlist_node *n, *slot = NULL;
+ struct hlist_node *slot = NULL;
- hlist_for_each_entry(p, n, &br->router_list, rlist) {
+ hlist_for_each_entry(p, &br->router_list, rlist) {
if ((unsigned long) port >= (unsigned long) p)
break;
- slot = n;
+ slot = &p->rlist;
}
if (slot)
@@ -1049,20 +1206,21 @@ timer:
static void br_multicast_query_received(struct net_bridge *br,
struct net_bridge_port *port,
- int saddr)
+ struct bridge_mcast_other_query *query,
+ struct br_ip *saddr,
+ unsigned long max_delay)
{
- if (saddr)
- mod_timer(&br->multicast_querier_timer,
- jiffies + br->multicast_querier_interval);
- else if (timer_pending(&br->multicast_querier_timer))
+ 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)
+ struct sk_buff *skb,
+ u16 vid)
{
const struct iphdr *iph = ip_hdr(skb);
struct igmphdr *ih = igmp_hdr(skb);
@@ -1070,6 +1228,7 @@ static int br_ip4_multicast_query(struct net_bridge *br,
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;
@@ -1080,8 +1239,6 @@ static int br_ip4_multicast_query(struct net_bridge *br,
(port && port->state == BR_STATE_DISABLED))
goto out;
- br_multicast_query_received(br, port, !!iph->saddr);
-
group = ih->group;
if (skb->len == sizeof(*ih)) {
@@ -1105,10 +1262,24 @@ static int br_ip4_multicast_query(struct net_bridge *br,
IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
}
- if (!group)
+ /* 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);
+ mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
if (!mp)
goto out;
@@ -1137,7 +1308,8 @@ out:
#if IS_ENABLED(CONFIG_IPV6)
static int br_ip6_multicast_query(struct net_bridge *br,
struct net_bridge_port *port,
- struct sk_buff *skb)
+ struct sk_buff *skb,
+ u16 vid)
{
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct mld_msg *mld;
@@ -1145,9 +1317,11 @@ static int br_ip6_multicast_query(struct net_bridge *br,
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);
@@ -1155,7 +1329,11 @@ static int br_ip6_multicast_query(struct net_bridge *br,
(port && port->state == BR_STATE_DISABLED))
goto out;
- br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
+ /* 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))) {
@@ -1166,7 +1344,7 @@ static int br_ip6_multicast_query(struct net_bridge *br,
max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
if (max_delay)
group = &mld->mld_mca;
- } else if (skb->len >= sizeof(*mld2q)) {
+ } else {
if (!pskb_may_pull(skb, sizeof(*mld2q))) {
err = -EINVAL;
goto out;
@@ -1174,13 +1352,32 @@ static int br_ip6_multicast_query(struct net_bridge *br,
mld2q = (struct mld2_query *)icmp6_hdr(skb);
if (!mld2q->mld2q_nsrcs)
group = &mld2q->mld2q_mca;
- max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(ntohs(mld2q->mld2q_mrc)) : 1;
+
+ max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
}
- if (!group)
+ 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);
+ mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
if (!mp)
goto out;
@@ -1206,9 +1403,12 @@ out:
}
#endif
-static void br_multicast_leave_group(struct net_bridge *br,
- struct net_bridge_port *port,
- struct br_ip *group)
+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;
@@ -1219,7 +1419,7 @@ static void br_multicast_leave_group(struct net_bridge *br,
spin_lock(&br->multicast_lock);
if (!netif_running(br->dev) ||
(port && port->state == BR_STATE_DISABLED) ||
- timer_pending(&br->multicast_querier_timer))
+ timer_pending(&other_query->timer))
goto out;
mdb = mlock_dereference(br->mdb, br);
@@ -1227,6 +1427,31 @@ static void br_multicast_leave_group(struct net_bridge *br,
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;
@@ -1279,46 +1504,58 @@ static void br_multicast_leave_group(struct net_bridge *br,
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)
+ __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_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)
+ const struct in6_addr *group,
+ __u16 vid)
{
struct br_ip br_group;
+ struct bridge_mcast_own_query *own_query;
- if (!ipv6_is_transient_multicast(group))
+ 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_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)
+ struct sk_buff *skb,
+ u16 vid)
{
struct sk_buff *skb2 = skb;
const struct iphdr *iph;
@@ -1345,7 +1582,7 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
return -EINVAL;
if (iph->protocol != IPPROTO_IGMP) {
- if ((iph->daddr & IGMP_LOCAL_GROUP_MASK) != IGMP_LOCAL_GROUP)
+ if (!ipv4_is_local_multicast(iph->daddr))
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
return 0;
}
@@ -1393,16 +1630,16 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
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);
+ 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);
+ err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
break;
case IGMP_HOST_MEMBERSHIP_QUERY:
- err = br_ip4_multicast_query(br, port, skb2);
+ err = br_ip4_multicast_query(br, port, skb2, vid);
break;
case IGMP_HOST_LEAVE_MESSAGE:
- br_ip4_multicast_leave_group(br, port, ih->group);
+ br_ip4_multicast_leave_group(br, port, ih->group, vid);
break;
}
@@ -1417,7 +1654,8 @@ err_out:
#if IS_ENABLED(CONFIG_IPV6)
static int br_multicast_ipv6_rcv(struct net_bridge *br,
struct net_bridge_port *port,
- struct sk_buff *skb)
+ struct sk_buff *skb,
+ u16 vid)
{
struct sk_buff *skb2;
const struct ipv6hdr *ip6h;
@@ -1439,8 +1677,14 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
* - MLD has always Router Alert hop-by-hop option
* - But we do not support jumbrograms.
*/
- if (ip6h->version != 6 ||
- ip6h->nexthdr != IPPROTO_HOPOPTS ||
+ 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;
@@ -1522,14 +1766,14 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
}
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);
+ 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);
+ err = br_ip6_multicast_mld2_report(br, port, skb2, vid);
break;
case ICMPV6_MGM_QUERY:
- err = br_ip6_multicast_query(br, port, skb2);
+ err = br_ip6_multicast_query(br, port, skb2, vid);
break;
case ICMPV6_MGM_REDUCTION:
{
@@ -1539,7 +1783,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
goto out;
}
mld = (struct mld_msg *)skb_transport_header(skb2);
- br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
+ br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
}
}
@@ -1550,7 +1794,7 @@ out:
#endif
int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
- struct sk_buff *skb)
+ struct sk_buff *skb, u16 vid)
{
BR_INPUT_SKB_CB(skb)->igmp = 0;
BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
@@ -1560,29 +1804,44 @@ int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
switch (skb->protocol) {
case htons(ETH_P_IP):
- return br_multicast_ipv4_rcv(br, port, skb);
+ 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);
+ return br_multicast_ipv6_rcv(br, port, skb, vid);
#endif
}
return 0;
}
-static void br_multicast_query_expired(unsigned long data)
+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_assign_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;
- spin_lock(&br->multicast_lock);
- if (br->multicast_startup_queries_sent <
- br->multicast_startup_query_count)
- br->multicast_startup_queries_sent++;
+ br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
+}
- br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_query_expired(unsigned long data)
+{
+ struct net_bridge *br = (void *)data;
- spin_unlock(&br->multicast_lock);
+ br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
}
+#endif
void br_multicast_init(struct net_bridge *br)
{
@@ -1591,6 +1850,7 @@ void br_multicast_init(struct net_bridge *br)
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;
@@ -1601,36 +1861,62 @@ void br_multicast_init(struct net_bridge *br)
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->multicast_querier_timer,
- br_multicast_querier_expired, (unsigned long)br);
- setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
+ 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
}
-void br_multicast_open(struct net_bridge *br)
+static void __br_multicast_open(struct net_bridge *br,
+ struct bridge_mcast_own_query *query)
{
- br->multicast_startup_queries_sent = 0;
+ query->startup_sent = 0;
if (br->multicast_disabled)
return;
- mod_timer(&br->multicast_query_timer, jiffies);
+ 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 *p, *n;
+ struct hlist_node *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);
+ 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);
@@ -1641,7 +1927,7 @@ void br_multicast_stop(struct net_bridge *br)
ver = mdb->ver;
for (i = 0; i < mdb->max; i++) {
- hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[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);
@@ -1732,18 +2018,24 @@ unlock:
return err;
}
-static void br_multicast_start_querier(struct net_bridge *br)
+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);
+ __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;
- __br_multicast_enable_port(port);
+ 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
}
}
@@ -1778,7 +2070,10 @@ rollback:
goto rollback;
}
- br_multicast_start_querier(br);
+ 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);
@@ -1788,6 +2083,8 @@ unlock:
int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
{
+ unsigned long max_delay;
+
val = !!val;
spin_lock_bh(&br->multicast_lock);
@@ -1795,8 +2092,22 @@ int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
goto unlock;
br->multicast_querier = val;
- if (val)
- br_multicast_start_querier(br);
+ 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);
@@ -1810,7 +2121,7 @@ int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
u32 old;
struct net_bridge_mdb_htable *mdb;
- spin_lock(&br->multicast_lock);
+ spin_lock_bh(&br->multicast_lock);
if (!netif_running(br->dev))
goto unlock;
@@ -1842,7 +2153,113 @@ rollback:
}
unlock:
- spin_unlock(&br->multicast_lock);
+ 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_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);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 19:40:19 +0000