| Date | Tue, 15 Feb 2011 16:13:16 -0800 | From | Greg KH <> | Subject | [139/272] inet6: prevent network storms caused by linux IPv6 routers |
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2.6.37-stable review patch. If anyone has any objections, please let us know.
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From: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
[ 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> --- 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; + skb_forward_csum(skb); /*
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