Merge remote-tracking branch 'net-next/master'

[karo-tx-linux.git] / net / netfilter / nf_nat_core.c

diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index 6f0f4f7f68a5f4a7f85c03b09a35b456bedc33a7..63a81540221169fcc6115e8c36cc84500beb809d 100644 (file)
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -432,6 +432,26 @@ nf_nat_setup_info(struct nf_conn *ct,
 }
 EXPORT_SYMBOL(nf_nat_setup_info);
 
+unsigned int
+nf_nat_alloc_null_binding(struct nf_conn *ct, unsigned int hooknum)
+{
+       /* Force range to this IP; let proto decide mapping for
+        * per-proto parts (hence not IP_NAT_RANGE_PROTO_SPECIFIED).
+        * Use reply in case it's already been mangled (eg local packet).
+        */
+       union nf_inet_addr ip =
+               (HOOK2MANIP(hooknum) == NF_NAT_MANIP_SRC ?
+               ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3 :
+               ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.u3);
+       struct nf_nat_range range = {
+               .flags          = NF_NAT_RANGE_MAP_IPS,
+               .min_addr       = ip,
+               .max_addr       = ip,
+       };
+       return nf_nat_setup_info(ct, &range, HOOK2MANIP(hooknum));
+}
+EXPORT_SYMBOL_GPL(nf_nat_alloc_null_binding);
+
 /* Do packet manipulations according to nf_nat_setup_info. */
 unsigned int nf_nat_packet(struct nf_conn *ct,
                           enum ip_conntrack_info ctinfo,