ipv6 mcast: Do not join device multicast for interface-local multicasts.
RFC4291 (IPv6 addressing architecture) says that interface-Local scope
spans only a single interface on a node. We should not join L2 device
multicast list for addresses in interface-local (or smaller) scope.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index e5de4855..3a2849f 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -661,6 +661,10 @@
struct net_device *dev = mc->idev->dev;
char buf[MAX_ADDR_LEN];
+ if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
+ IPV6_ADDR_SCOPE_LINKLOCAL)
+ return;
+
spin_lock_bh(&mc->mca_lock);
if (!(mc->mca_flags&MAF_LOADED)) {
mc->mca_flags |= MAF_LOADED;
@@ -687,6 +691,10 @@
struct net_device *dev = mc->idev->dev;
char buf[MAX_ADDR_LEN];
+ if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
+ IPV6_ADDR_SCOPE_LINKLOCAL)
+ return;
+
spin_lock_bh(&mc->mca_lock);
if (mc->mca_flags&MAF_LOADED) {
mc->mca_flags &= ~MAF_LOADED;