-/**
- * @brief Add static mapping.
- *
- * Create static mapping between local addr+port and external addr+port.
- *
- * @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 vrf_id VRF ID.
- * @param addr_only If 0 address port and pair mapping, otherwise address only.
- * @param sw_if_index External port instead of specific IP address.
- * @param is_add If 0 delete static mapping, otherwise add.
- * @param twice_nat If value is TWICE_NAT then translate external host address
- * and port.
- * If value is TWICE_NAT_SELF then translate external host
- * address and port whenever external host address equals
- * local address of internal host.
- * @param out2in_only If 1 rule match only out2in direction
- * @param tag - opaque string tag
- *
- * @returns
- */