1 files changed, 70 insertions, 0 deletions
diff --git a/include/linux/netfilter_ipv4/ip_nat_protocol.h b/include/linux/netfilter_ipv4/ip_nat_protocol.h
new file mode 100644
index 00000000000..129708c2238
--- /dev/null
+++ b/include/linux/netfilter_ipv4/ip_nat_protocol.h
@@ -0,0 +1,70 @@
+/* Header for use in defining a given protocol. */
+#ifndef _IP_NAT_PROTOCOL_H
+#define _IP_NAT_PROTOCOL_H
+#include <linux/init.h>
+#include <linux/list.h>
+
+struct iphdr;
+struct ip_nat_range;
+
+struct ip_nat_protocol
+{
+	/* Protocol name */
+	const char *name;
+
+	/* Protocol number. */
+	unsigned int protonum;
+
+	/* Translate a packet to the target according to manip type.
+	   Return true if succeeded. */
+	int (*manip_pkt)(struct sk_buff **pskb,
+			 unsigned int iphdroff,
+			 const struct ip_conntrack_tuple *tuple,
+			 enum ip_nat_manip_type maniptype);
+
+	/* Is the manipable part of the tuple between min and max incl? */
+	int (*in_range)(const struct ip_conntrack_tuple *tuple,
+			enum ip_nat_manip_type maniptype,
+			const union ip_conntrack_manip_proto *min,
+			const union ip_conntrack_manip_proto *max);
+
+	/* Alter the per-proto part of the tuple (depending on
+	   maniptype), to give a unique tuple in the given range if
+	   possible; return false if not.  Per-protocol part of tuple
+	   is initialized to the incoming packet. */
+	int (*unique_tuple)(struct ip_conntrack_tuple *tuple,
+			    const struct ip_nat_range *range,
+			    enum ip_nat_manip_type maniptype,
+			    const struct ip_conntrack *conntrack);
+
+	unsigned int (*print)(char *buffer,
+			      const struct ip_conntrack_tuple *match,
+			      const struct ip_conntrack_tuple *mask);
+
+	unsigned int (*print_range)(char *buffer,
+				    const struct ip_nat_range *range);
+};
+
+#define MAX_IP_NAT_PROTO 256
+extern struct ip_nat_protocol *ip_nat_protos[MAX_IP_NAT_PROTO];
+
+/* Protocol registration. */
+extern int ip_nat_protocol_register(struct ip_nat_protocol *proto);
+extern void ip_nat_protocol_unregister(struct ip_nat_protocol *proto);
+
+static inline struct ip_nat_protocol *ip_nat_find_proto(u_int8_t protocol)
+{
+	return ip_nat_protos[protocol];
+}
+
+/* Built-in protocols. */
+extern struct ip_nat_protocol ip_nat_protocol_tcp;
+extern struct ip_nat_protocol ip_nat_protocol_udp;
+extern struct ip_nat_protocol ip_nat_protocol_icmp;
+extern struct ip_nat_protocol ip_nat_unknown_protocol;
+
+extern int init_protocols(void) __init;
+extern void cleanup_protocols(void);
+extern struct ip_nat_protocol *find_nat_proto(u_int16_t protonum);
+
+#endif /*_IP_NAT_PROTO_H*/