From 8b83bc77bf77cc8459cb94e52b08e775104c4c48 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Mon, 8 Aug 2005 11:50:55 +0200 Subject: [PATCH] [PATCH] don't try to do any NAT on untracked connections 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 Signed-off-by: Linus Torvalds --- net/ipv4/netfilter/ip_nat_standalone.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/ipv4/netfilter/ip_nat_standalone.c b/net/ipv4/netfilter/ip_nat_standalone.c index bc59d0d6e89..91d5ea1dbbc 100644 --- a/net/ipv4/netfilter/ip_nat_standalone.c +++ b/net/ipv4/netfilter/ip_nat_standalone.c @@ -102,6 +102,10 @@ ip_nat_fn(unsigned int hooknum, return NF_ACCEPT; } + /* Don't try to NAT if this packet is not conntracked */ + if (ct == &ip_conntrack_untracked) + return NF_ACCEPT; + switch (ctinfo) { case IP_CT_RELATED: case IP_CT_RELATED+IP_CT_IS_REPLY: -- 2.20.1