1 files changed, 74 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_nat_protocol.h b/include/net/netfilter/nf_nat_protocol.h
new file mode 100644
index 00000000..93cc90d2
--- /dev/null
+++ b/include/net/netfilter/nf_nat_protocol.h
@@ -0,0 +1,74 @@
+/* Header for use in defining a given protocol. */
+#ifndef _NF_NAT_PROTOCOL_H
+#define _NF_NAT_PROTOCOL_H
+#include <net/netfilter/nf_nat.h>
+#include <linux/netfilter/nfnetlink_conntrack.h>
+
+struct nf_nat_range;
+
+struct nf_nat_protocol {
+	/* Protocol number. */
+	unsigned int protonum;
+
+	struct module *me;
+
+	/* Translate a packet to the target according to manip type.
+	   Return true if succeeded. */
+	bool (*manip_pkt)(struct sk_buff *skb,
+			  unsigned int iphdroff,
+			  const struct nf_conntrack_tuple *tuple,
+			  enum nf_nat_manip_type maniptype);
+
+	/* Is the manipable part of the tuple between min and max incl? */
+	bool (*in_range)(const struct nf_conntrack_tuple *tuple,
+			 enum nf_nat_manip_type maniptype,
+			 const union nf_conntrack_man_proto *min,
+			 const union nf_conntrack_man_proto *max);
+
+	/* Alter the per-proto part of the tuple (depending on
+	   maniptype), to give a unique tuple in the given range if
+	   possible.  Per-protocol part of tuple is initialized to the
+	   incoming packet. */
+	void (*unique_tuple)(struct nf_conntrack_tuple *tuple,
+			     const struct nf_nat_range *range,
+			     enum nf_nat_manip_type maniptype,
+			     const struct nf_conn *ct);
+
+	int (*range_to_nlattr)(struct sk_buff *skb,
+			       const struct nf_nat_range *range);
+
+	int (*nlattr_to_range)(struct nlattr *tb[],
+			       struct nf_nat_range *range);
+};
+
+/* Protocol registration. */
+extern int nf_nat_protocol_register(const struct nf_nat_protocol *proto);
+extern void nf_nat_protocol_unregister(const struct nf_nat_protocol *proto);
+
+/* Built-in protocols. */
+extern const struct nf_nat_protocol nf_nat_protocol_tcp;
+extern const struct nf_nat_protocol nf_nat_protocol_udp;
+extern const struct nf_nat_protocol nf_nat_protocol_icmp;
+extern const struct nf_nat_protocol nf_nat_unknown_protocol;
+
+extern int init_protocols(void) __init;
+extern void cleanup_protocols(void);
+extern const struct nf_nat_protocol *find_nat_proto(u_int16_t protonum);
+
+extern bool nf_nat_proto_in_range(const struct nf_conntrack_tuple *tuple,
+				  enum nf_nat_manip_type maniptype,
+				  const union nf_conntrack_man_proto *min,
+				  const union nf_conntrack_man_proto *max);
+
+extern void nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
+				      const struct nf_nat_range *range,
+				      enum nf_nat_manip_type maniptype,
+				      const struct nf_conn *ct,
+				      u_int16_t *rover);
+
+extern int nf_nat_proto_range_to_nlattr(struct sk_buff *skb,
+					const struct nf_nat_range *range);
+extern int nf_nat_proto_nlattr_to_range(struct nlattr *tb[],
+					struct nf_nat_range *range);
+
+#endif /*_NF_NAT_PROTO_H*/