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>
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@ -401,6 +401,9 @@ int ip6_forward(struct sk_buff *skb)
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goto drop;
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}
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if (skb->pkt_type != PACKET_HOST)
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goto drop;
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skb_forward_csum(skb);
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/*
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