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Diffstat (limited to 'net/bridge/br_multicast.c')
-rw-r--r--net/bridge/br_multicast.c101
1 files changed, 88 insertions, 13 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 5ccac62b4005..b3f17c9b4d06 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -789,6 +789,18 @@ static void br_ip6_multicast_querier_expired(unsigned long data)
}
#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)
@@ -804,8 +816,10 @@ 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,
@@ -1065,6 +1079,62 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
}
#endif
+static bool br_ip4_multicast_select_querier(struct net_bridge *br,
+ __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;
+
+ return true;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static bool br_ip6_multicast_select_querier(struct net_bridge *br,
+ 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;
+
+ return true;
+}
+#endif
+
+static bool br_multicast_select_querier(struct net_bridge *br,
+ struct br_ip *saddr)
+{
+ switch (saddr->proto) {
+ case htons(ETH_P_IP):
+ return br_ip4_multicast_select_querier(br, saddr->u.ip4);
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ return br_ip6_multicast_select_querier(br, &saddr->u.ip6);
+#endif
+ }
+
+ return false;
+}
+
static void
br_multicast_update_query_timer(struct net_bridge *br,
struct bridge_mcast_other_query *query,
@@ -1127,15 +1197,13 @@ timer:
static void br_multicast_query_received(struct net_bridge *br,
struct net_bridge_port *port,
struct bridge_mcast_other_query *query,
- int saddr,
- bool is_general_query,
+ struct br_ip *saddr,
unsigned long max_delay)
{
- if (saddr && is_general_query)
- br_multicast_update_query_timer(br, query, max_delay);
- else if (timer_pending(&query->timer))
+ if (!br_multicast_select_querier(br, saddr))
return;
+ br_multicast_update_query_timer(br, query, max_delay);
br_multicast_mark_router(br, port);
}
@@ -1150,6 +1218,7 @@ 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;
@@ -1191,11 +1260,14 @@ static int br_ip4_multicast_query(struct net_bridge *br,
goto out;
}
- br_multicast_query_received(br, port, &br->ip4_other_query,
- !!iph->saddr, !group, max_delay);
+ if (!group) {
+ saddr.proto = htons(ETH_P_IP);
+ saddr.u.ip4 = iph->saddr;
- if (!group)
+ 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)
@@ -1235,6 +1307,7 @@ 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;
@@ -1283,12 +1356,14 @@ static int br_ip6_multicast_query(struct net_bridge *br,
goto out;
}
- br_multicast_query_received(br, port, &br->ip6_other_query,
- !ipv6_addr_any(&ip6h->saddr),
- is_general_query, max_delay);
+ if (is_general_query) {
+ saddr.proto = htons(ETH_P_IPV6);
+ saddr.u.ip6 = ip6h->saddr;
- if (!group)
+ br_multicast_query_received(br, port, &br->ip6_other_query,
+ &saddr, max_delay);
goto out;
+ }
mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
if (!mp)