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authorJozsef Kadlecsik <kadlec@blackhole.kfki.hu>2012-11-30 12:37:26 +0000
committerPablo Neira Ayuso <pablo@netfilter.org>2012-12-03 15:14:20 +0100
commita0ecb85a2c3af73c63b6d44ce82aea52347ccf55 (patch)
tree41b54a39fabf0bda2bf3ea601154b36076d7b1d6 /net/ipv4
parent6d1fafcaecaa2e66eb9861a39d22fc7380ce6f78 (diff)
netfilter: nf_nat: Handle routing changes in MASQUERADE target
When the route changes (backup default route, VPNs) which affect a masqueraded target, the packets were sent out with the outdated source address. The patch addresses the issue by comparing the outgoing interface directly with the masqueraded interface in the nat table. Events are inefficient in this case, because it'd require adding route events to the network core and then scanning the whole conntrack table and re-checking the route for all entry. Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/iptable_nat.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/iptable_nat.c b/net/ipv4/netfilter/iptable_nat.c
index ac635a7b4416..da2c8a368f68 100644
--- a/net/ipv4/netfilter/iptable_nat.c
+++ b/net/ipv4/netfilter/iptable_nat.c
@@ -134,6 +134,10 @@ nf_nat_ipv4_fn(unsigned int hooknum,
/* ESTABLISHED */
NF_CT_ASSERT(ctinfo == IP_CT_ESTABLISHED ||
ctinfo == IP_CT_ESTABLISHED_REPLY);
+ if (nf_nat_oif_changed(hooknum, ctinfo, nat, out)) {
+ nf_ct_kill_acct(ct, ctinfo, skb);
+ return NF_DROP;
+ }
}
return nf_nat_packet(ct, ctinfo, hooknum, skb);