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Subject[139/272] inet6: prevent network storms caused by linux IPv6 routers
2.6.37-stable review patch.  If anyone has any objections, please let us know.


From: Alexey Kuznetsov <>

[ Upstream commit 72b43d0898e97f588293b4a24b33c58c46633d81 ]

Linux IPv6 forwards unicast packets, which are link layer multicasts...
The hole was present since day one. I was 100% this check is there, but it is not.

The problem shows itself, f.e. when Microsoft Network Load Balancer runs on a network.
This software resolves IPv6 unicast addresses to multicast MAC addresses.

Signed-off-by: Alexey Kuznetsov <>
Signed-off-by: David S. Miller <>
Signed-off-by: Greg Kroah-Hartman <>
net/ipv6/ip6_output.c | 3 +++
1 file changed, 3 insertions(+)

--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -401,6 +401,9 @@ int ip6_forward(struct sk_buff *skb)
goto drop;

+ if (skb->pkt_type != PACKET_HOST)
+ goto drop;


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