Commit 2ad5b9e4 authored Oct 16, 2012 by Eric Dumazet Committed by Pablo Neira Ayuso Oct 17, 2012

netfilter: xt_TEE: don't use destination address found in header



Torsten Luettgert bisected TEE regression starting with commit
f8126f1d (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
c92b9655 (ipv4: Add FLOWI_FLAG_KNOWN_NH), so that known
nexthop (info->gw.ip) has preference on resolving.

Reported-by: Torsten Luettgert <ml-netfilter@enda.eu>
Bisected-by: Torsten Luettgert <ml-netfilter@enda.eu>
Tested-by: Torsten Luettgert <ml-netfilter@enda.eu>
Cc: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

parent 0b4f5b1d

net/netfilter/xt_TEE.c

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -70,6 +70,7 @@ tee_tg_route4(struct sk_buff skb, const struct xt_tee_tginfo info)
	fl4.daddr = info->gw.ip;		fl4.daddr = info->gw.ip;
	fl4.flowi4_tos = RT_TOS(iph->tos);		fl4.flowi4_tos = RT_TOS(iph->tos);
	fl4.flowi4_scope = RT_SCOPE_UNIVERSE;		fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
			fl4.flowi4_flags = FLOWI_FLAG_KNOWN_NH;
	rt = ip_route_output_key(net, &fl4);		rt = ip_route_output_key(net, &fl4);
	if (IS_ERR(rt))		if (IS_ERR(rt))
	return false;		return false;

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