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Date: Tue, 15 Feb 2011 16:13:16 -0800 From: Greg KH <gregkh@...e.de> To: linux-kernel@...r.kernel.org, stable@...nel.org Cc: stable-review@...nel.org, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, Alexey Kuznetsov <kuznet@....inr.ac.ru>, "David S. Miller" <davem@...emloft.net> 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 <kuznet@....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@....inr.ac.ru> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.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); /* -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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