+/**
+ * @brief Add/delete NAT44-EI static mapping
+ *
+ * @param l_addr local IPv4 address
+ * @param e_addr external IPv4 address
+ * @param l_port local port number
+ * @param e_port external port number
+ * @param proto L4 protocol
+ * @param sw_if_index use interface address as external IPv4 address
+ * @param vrf_id local VRF ID
+ * @param addr_only 1 = 1:1NAT, 0 = 1:1NAPT
+ * @param identity_nat identity NAT
+ * @param tag opaque string tag
+ * @param is_add 1 = add, 0 = delete
+ *
+ * @return 0 on success, non-zero value otherwise
+
+ */
+int nat44_ei_add_del_static_mapping (ip4_address_t l_addr,
+ ip4_address_t e_addr, u16 l_port,
+ u16 e_port, nat_protocol_t proto,
+ u32 sw_if_index, u32 vrf_id, u8 addr_only,
+ u8 identity_nat, u8 *tag, u8 is_add);
+
+/**
+ * @brief Delete NAT44-EI session
+ *
+ * @param addr IPv4 address
+ * @param port L4 port number
+ * @param proto L4 protocol
+ * @param vrf_id VRF ID
+ * @param is_in 1 = inside network address and port pair, 0 = outside
+ *
+ * @return 0 on success, non-zero value otherwise
+ */
+int nat44_ei_del_session (snat_main_t *sm, ip4_address_t *addr, u16 port,
+ nat_protocol_t proto, u32 vrf_id, int is_in);
+
+/**
+ * @brief Match NAT44-EI static mapping.
+ *
+ * @param key address and port to match
+ * @param addr external/local address of the matched mapping
+ * @param port port of the matched mapping
+ * @param fib_index fib index of the matched mapping
+ * @param by_external if 0 match by local address otherwise match by
+ * external address
+ * @param is_addr_only 1 if matched mapping is address only
+ * @param is_identity_nat 1 if indentity mapping
+ *
+ * @returns 0 if match found otherwise 1.
+ */
+int nat44_ei_static_mapping_match (ip4_address_t match_addr, u16 match_port,
+ u32 match_fib_index,
+ nat_protocol_t match_protocol,
+ ip4_address_t *mapping_addr,
+ u16 *mapping_port, u32 *mapping_fib_index,
+ u8 by_external, u8 *is_addr_only,
+ u8 *is_identity_nat);
+
+/**
+ * @brief Clear all active NAT44-EI sessions.
+ */
+void nat44_ei_sessions_clear ();
+