linux-kernel - [ 71/83] netfilter: xt_TEE: dont use destination address found in header

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Message-Id: <20121122004220.301768859@linuxfoundation.org>
Date:	Wed, 21 Nov 2012 16:42:33 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Torsten Luettgert <ml-netfilter@...a.eu>,
	Julian Anastasov <ja@....bg>,
	Eric Dumazet <edumazet@...gle.com>,
	Pablo Neira Ayuso <pablo@...filter.org>
Subject: [ 71/83] netfilter: xt_TEE: dont use destination address found in header

3.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <eric.dumazet@...il.com>

commit 2ad5b9e4bd314fc685086b99e90e5de3bc59e26b upstream.

Torsten Luettgert bisected TEE regression starting with commit
f8126f1d5136be1 (ipv4: Adjust semantics of rt->rt_gateway.)

The problem is that it tries to ARP-lookup the original destination
address of the forwarded packet, not the address of the gateway.

Fix this using FLOWI_FLAG_KNOWN_NH Julian added in commit
c92b96553a80c1 (ipv4: Add FLOWI_FLAG_KNOWN_NH), so that known
nexthop (info->gw.ip) has preference on resolving.

Reported-by: Torsten Luettgert <ml-netfilter@...a.eu>
Bisected-by: Torsten Luettgert <ml-netfilter@...a.eu>
Tested-by: Torsten Luettgert <ml-netfilter@...a.eu>
Cc: Julian Anastasov <ja@....bg>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/netfilter/xt_TEE.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/netfilter/xt_TEE.c
+++ b/net/netfilter/xt_TEE.c
@@ -70,6 +70,7 @@ tee_tg_route4(struct sk_buff *skb, const
 	fl4.daddr = info->gw.ip;
 	fl4.flowi4_tos = RT_TOS(iph->tos);
 	fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
+	fl4.flowi4_flags = FLOWI_FLAG_KNOWN_NH;
 	rt = ip_route_output_key(net, &fl4);
 	if (IS_ERR(rt))
 		return false;


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