module huawei-cgn-common {

    yang-version 1;

    namespace
      "urn:huawei:yang:huawei-cgn-common";

    prefix cgn-common;

    import huawei-extension {
      prefix ext;
    }

    organization
      "Huawei Technologies Co., Ltd.";

    contact
      "Huawei Industrial Base
    Bantian, Longgang
    Shenzhen 518129
    People's Republic of China
    Website: http://www.huawei.com
    Email: support@huawei.com";

    description
      "This module contains a collection of YANG definitions for Configurations of cgn commaon element.";

    revision "2021-07-31" {
      description "Initial revision.";
      reference
        "Huawei private.";

    }

    ext:task-name "nat";

    typedef alg-protocol-type {
      type enumeration {
        enum "ftp" {
          value 1;
          description
            "Indicate file transfer protocol.";
        }
        enum "rtsp" {
          value 2;
          description
            "Indicate real time streaming protocol.";
        }
        enum "pptp" {
          value 4;
          description
            "Indicate point-to-point tunnel protocol.";
        }
        enum "sip" {
          value 8;
          description
            "Indicate session initiation protocol.";
        }
        enum "dns" {
          value 16;
          description
            "Indicate domain name service.";
        }
      }
      description "ALG Protocol.";
    }

    grouping alg {
      description
        "Application level gateway.";
      container algs {
        description
          "List of Application level gateway.";
        list alg {
          key "protocol";
          description
            "Configure application level gateway.";
          leaf protocol {
            type alg-protocol-type;
            description "Protocol.";
          }

          leaf rate-threshold {
            when "../protocol='ftp'";
            type uint16 {
              range "64..15000";
            }
            units "pps";
            description
              "Enables NAT ALG rate limiting for standard FTP protocols.";
          }

          leaf separate-translation {
            when "../protocol='sip'";
            type boolean;
            default "false";
            description
              "Enable/disable the SIP control channel and data channel match an address-based NAT server separately in the NAT instance for NAT.";
          }
        }  // list alg
      }  // container algs
    }  // grouping alg
  }  // module huawei-cgn-common