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Commit ec16ef22 authored by YOSHIFUJI Hideaki / 吉藤英明's avatar YOSHIFUJI Hideaki / 吉藤英明 Committed by David S. Miller
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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: default avatarYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f45a5c26

net/ipv6/mcast.c

+8 −0
Original line number Diff line number Diff line
@@ -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;