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authorYOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>2013-02-09 08:29:58 +0400
committerDavid S. Miller <davem@davemloft.net>2013-02-11 09:21:44 +0400
commitec16ef2228829698fdbd2f6b160ff52551a6bf8a (patch)
tree2dc5a8441691c824ea3c4fc185af78b0757d1609 /net/ipv6
parentf45a5c267da35174e22cec955093a7513dc1623d (diff)
downloadlinux-ec16ef2228829698fdbd2f6b160ff52551a6bf8a.tar.xz
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>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/mcast.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index e5de48551864..3a2849f660ca 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -661,6 +661,10 @@ static void igmp6_group_added(struct ifmcaddr6 *mc)
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 @@ static void igmp6_group_dropped(struct ifmcaddr6 *mc)
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;