From 72b43d0898e97f588293b4a24b33c58c46633d81 Mon Sep 17 00:00:00 2001 From: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Date: Wed, 12 Jan 2011 08:34:08 +0000 Subject: [PATCH] inet6: prevent network storms caused by linux IPv6 routers 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 <kuznet@ms2.inr.ac.ru> Signed-off-by: David S. Miller <davem@davemloft.net> --- net/ipv6/ip6_output.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 94b5bf132b2e..5f8d242be3f3 100644 --- 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; + skb_forward_csum(skb); /* -- GitLab