[NETFILTER]: nf_nat: use extension infrastructure

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 8 insertions, 17 deletions

diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index f1e0fee..b2083d3 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -278,22 +278,5 @@ nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size);
 extern void
 nf_conntrack_unregister_cache(u_int32_t features);
 
-/* valid combinations:
- * basic: nf_conn, nf_conn .. nf_conn_help
- * nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat .. nf_conn help
- */
-#ifdef CONFIG_NF_NAT_NEEDED
-#include <net/netfilter/nf_nat.h>
-static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
-{
-	unsigned int offset = sizeof(struct nf_conn);
-
-	if (!(ct->features & NF_CT_F_NAT))
-		return NULL;
-
-	offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
-	return (struct nf_conn_nat *) ((void *)ct + offset);
-}
-#endif /* CONFIG_NF_NAT_NEEDED */
 #endif /* __KERNEL__ */
 #endif /* _NF_CONNTRACK_H */
diff --git a/include/net/netfilter/nf_conntrack_extend.h b/include/net/netfilter/nf_conntrack_extend.h
index 05357dc..73b5711 100644
--- a/include/net/netfilter/nf_conntrack_extend.h
+++ b/include/net/netfilter/nf_conntrack_extend.h
@@ -6,10 +6,12 @@
 enum nf_ct_ext_id
 {
 	NF_CT_EXT_HELPER,
+	NF_CT_EXT_NAT,
 	NF_CT_EXT_NUM,
 };
 
 #define NF_CT_EXT_HELPER_TYPE struct nf_conn_help
+#define NF_CT_EXT_NAT_TYPE struct nf_conn_nat
 
 /* Extensions: optional stuff which isn't permanently in struct. */
 struct nf_ct_ext {
diff --git a/include/net/netfilter/nf_nat.h b/include/net/netfilter/nf_nat.h
index 575dc8a..0425e28 100644
--- a/include/net/netfilter/nf_nat.h
+++ b/include/net/netfilter/nf_nat.h
@@ -52,6 +52,7 @@ struct nf_nat_multi_range_compat
 #ifdef __KERNEL__
 #include <linux/list.h>
 #include <linux/netfilter/nf_conntrack_pptp.h>
+#include <net/netfilter/nf_conntrack_extend.h>
 
 struct nf_conn;
 
@@ -89,6 +90,11 @@ extern unsigned int nf_nat_setup_info(struct nf_conn *ct,
 extern int nf_nat_used_tuple(const struct nf_conntrack_tuple *tuple,
 			     const struct nf_conn *ignored_conntrack);
 
+static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
+{
+	return nf_ct_ext_find(ct, NF_CT_EXT_NAT);
+}
+
 extern int nf_nat_module_is_loaded;
 
 #else  /* !__KERNEL__: iptables wants this to compile. */