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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>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明 2013-02-09 04:29:58 +00:00 committed by David S. Miller
parent f45a5c267d
commit ec16ef2228
1 changed files with 8 additions and 0 deletions
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8
net/ipv6/mcast.c
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@ -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;