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Date: Wed, 12 Dec 2012 17:23:49 -0700
From: Andrew Collins <bsderandrew@...il.com>
To: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
kadlec@...ckhole.kfki.hu
Subject: [PATCH v2] netfilter: nf_nat: Also handle non-ESTABLISHED routing changes in MASQUERADE
The MASQUERADE target now handles routing changes which affect
the output interface of a connection, but only for ESTABLISHED
connections. It is also possible for NEW connections which
already have a conntrack entry to be affected by routing changes.
This adds a check to drop entries in the NEW+conntrack state
when the oif has changed.
Signed-off-by: Andrew Collins <bsderandrew@...il.com>
---
net/ipv4/netfilter/iptable_nat.c | 15 ++++++++++-----
net/ipv6/netfilter/ip6table_nat.c | 15 ++++++++++-----
2 files changed, 20 insertions(+), 10 deletions(-)
diff --git a/net/ipv4/netfilter/iptable_nat.c b/net/ipv4/netfilter/iptable_nat.c
index da2c8a3..eeaff7e 100644
--- a/net/ipv4/netfilter/iptable_nat.c
+++ b/net/ipv4/netfilter/iptable_nat.c
@@ -124,23 +124,28 @@ nf_nat_ipv4_fn(unsigned int hooknum,
ret = nf_nat_rule_find(skb, hooknum, in, out, ct);
if (ret != NF_ACCEPT)
return ret;
- } else
+ } else {
pr_debug("Already setup manip %s for ct %p\n",
maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST",
ct);
+ if (nf_nat_oif_changed(hooknum, ctinfo, nat, out))
+ goto oif_changed;
+ }
break;
default:
/* 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;
- }
+ if (nf_nat_oif_changed(hooknum, ctinfo, nat, out))
+ goto oif_changed;
}
return nf_nat_packet(ct, ctinfo, hooknum, skb);
+
+oif_changed:
+ nf_ct_kill_acct(ct, ctinfo, skb);
+ return NF_DROP;
}
static unsigned int
diff --git a/net/ipv6/netfilter/ip6table_nat.c b/net/ipv6/netfilter/ip6table_nat.c
index 6c8ae24..e0e788d 100644
--- a/net/ipv6/netfilter/ip6table_nat.c
+++ b/net/ipv6/netfilter/ip6table_nat.c
@@ -127,23 +127,28 @@ nf_nat_ipv6_fn(unsigned int hooknum,
ret = nf_nat_rule_find(skb, hooknum, in, out, ct);
if (ret != NF_ACCEPT)
return ret;
- } else
+ } else {
pr_debug("Already setup manip %s for ct %p\n",
maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST",
ct);
+ if (nf_nat_oif_changed(hooknum, ctinfo, nat, out))
+ goto oif_changed;
+ }
break;
default:
/* 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;
- }
+ if (nf_nat_oif_changed(hooknum, ctinfo, nat, out))
+ goto oif_changed;
}
return nf_nat_packet(ct, ctinfo, hooknum, skb);
+
+oif_changed:
+ nf_ct_kill_acct(ct, ctinfo, skb);
+ return NF_DROP;
}
static unsigned int
--
1.7.1
--
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