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[PATCH] don't try to do any NAT on untracked connections

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With the introduction of 'rustynat' in 2.6.11, the old tricks of preventing
NAT of 'untracked' connections (e.g. NOTRACK target in 'raw' table) are no
longer sufficient.

The ip_conntrack_untracked.status |= IPS_NAT_DONE_MASK effectively
prevents iteration of the 'nat' table, but doesn't prevent nat_packet()
to be executed.  Since nr_manips is gone in 'rustynat', nat_packet() now
implicitly thinks that it has to do NAT on the packet.

This patch fixes that problem by explicitly checking for
ip_conntrack_untracked in ip_nat_fn().

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Harald Welte 2005-08-08 11:50:55 +02:00 committed by Linus Torvalds
parent 48de5beeb0
commit 8b83bc77bf
1 changed files with 4 additions and 0 deletions
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4
net/ipv4/netfilter/ip_nat_standalone.c
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@ -102,6 +102,10 @@ ip_nat_fn(unsigned int hooknum,
return NF_ACCEPT; return NF_ACCEPT;
} }
/* Don't try to NAT if this packet is not conntracked */
if (ct == &ip_conntrack_untracked)
return NF_ACCEPT;
switch (ctinfo) { switch (ctinfo) {
case IP_CT_RELATED: case IP_CT_RELATED:
case IP_CT_RELATED+IP_CT_IS_REPLY: case IP_CT_RELATED+IP_CT_IS_REPLY: