netfilter: nf_nat: Also handle non-ESTABLISHED routing changes in MASQUERADE

Since (a0ecb85 netfilter: nf_nat: Handle routing changes in MASQUERADE
target), the MASQUERADE target 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@gmail.com>
Acked-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/ipv4/netfilter/iptable_nat.c b/net/ipv4/netfilter/iptable_nat.c
index da2c8a3..eeaff7e 100644 (file)
--- 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 (file)
--- 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