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inet6: prevent network storms caused by linux IPv6 routers

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[ 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 <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alexey Kuznetsov 2011-01-12 08:34:08 +00:00 committed by Greg Kroah-Hartman
parent bdbeaf1567
commit 3e7e81d9e8
1 changed files with 3 additions and 0 deletions
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3
net/ipv6/ip6_output.c
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@ -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);
/*