submodule huawei-dhcpv6-relay {

    yang-version 1;

    belongs-to huawei-dhcpv6 {
        prefix dhcpv6;
    }

    import ietf-inet-types {
      prefix inet;
    }
    import huawei-ifm {
      prefix ifm;
    }
    import huawei-network-instance {
      prefix ni;
    }
    import huawei-pub-type {
      prefix pub-type;
    }
    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 managing DHCPv6 relay.";

    revision "2020-03-09" {
      description "Modify description.";
      reference
        "Huawei private.";

    }

    revision "2019-12-16" {
      description "Initial revision.";
      reference
        "Huawei private.";

    }


    typedef rapid-commit-flag-type {
      type enumeration {
        enum "off" {
          value 0;
          description
            "Disable rapid commit.";
        }
        enum "on" {
          value 1;
          description "Enable rapid commit.";
        }
      }
      description
        "The type of rapid commit flag.";
    }

    typedef relay-table-status {
      type enumeration {
        enum "init" {
          value 0;
          description "Init status.";
        }
        enum "solicit" {
          value 1;
          description
            "Send solicit packet to server.";
        }
        enum "advertise" {
          value 2;
          description
            "Send Advertise packet to client.";
        }
        enum "request" {
          value 3;
          description
            "Send request packet to server.";
        }
        enum "renewrebind" {
          value 4;
          description
            "Send renew or rebind packet to server.";
        }
        enum "confirm" {
          value 5;
          description
            "Send confirm packet to server.";
        }
        enum "decline" {
          value 6;
          description
            "Send decline packet to server.";
        }
        enum "release" {
          value 7;
          description
            "Send release packet to server.";
        }
        enum "up" {
          value 8;
          description "Stable status.";
        }
        enum "error" {
          value 9;
          description "Error status.";
        }
      }
      description
        "The type of relay table status.";
    }

    typedef ia-type {
      type enumeration {
        enum "iainvalid" {
          value 0;
          description
            "Invalid identity association.";
        }
        enum "iana" {
          value 1;
          description
            "Identity association for non-temporary addresses.";
        }
        enum "iata" {
          value 2;
          description
            "Identity association for temporary addresses.";
        }
        enum "iapd" {
          value 3;
          description
            "Identity association for prefix delegation.";
        }
      }
      description
        "The type of identity association.";
    }

    typedef relay-file-authentication-mode {
      type enumeration {
        enum "check" {
          value 0;
          description "Check.";
        }
        enum "no-check" {
          value 1;
          description "No-check.";
        }
        enum "force-check" {
          value 2;
          description "Force-check.";
        }
      }
      description
        "The type of file authentication mode.";
    }

    grouping dhcpv6-relay-type {
      description "DHCPv6 relay.";
      container pd-route {
        description
          "Configure DHCPv6 PD route.";
        leaf export {
          type boolean;
          default "false";
          description
            "Enable/disable DHCPv6 export PD route.";
        }

        leaf save-file-name {
          type string {
            length "12..69";
            pattern '(\S+:\S*/dhcp/\S+\.pd)';
          }
          description
            "Name of the file for saving PD routes. For example, the name can be in the format of cfcard:/dhcp/xxx.pd or home:/dhcp/xxx.pd, where xxx can be any characters.";
        }

        leaf write-route-delay {
          type uint32 {
            range "1..1440";
          }
          units "min";
          default "5";
          description
            "The delay time for saving PD routes.";
        }

        leaf write-route-number {
          type uint32 {
            range "40960..1310720";
          }
          default "40960";
          description
            "The number for saving PD routes. Only 40960 userinfo table items can be written to a board with memory less than 16 GB, and other boards support 1310720 userinfo table items.";
        }

        leaf access-limit {
          type uint32 {
            range "40960..655360";
          }
          description
            "Maximum number of access users.";
        }

        leaf file-authentication-mode {
          type relay-file-authentication-mode;
          default "check";
          description
            "Set file authentication mode.";
        }
      }  // container pd-route

      container server-groups {
        description
          "List of DHCPv6 relay server groups.";
        list server-group {
          key "name";
          max-elements 10;
          description
            "Configure a DHCPv6 relay server group.";
          leaf name {
            type string {
              length "1..32";
            }
            description
              "DHCPv6 relay server group name.";
          }

          container server-addresses {
            description
              "List of DHCPv6 relay destination servers in a server group.";
            list server-address {
              key "server";
              max-elements 20;
              description
                "Configure a DHCPv6 relay destination server in a server group.";
              leaf server {
                type inet:ipv6-address-no-zone;
                description
                  "DHCPv6 relay destination server address in a server group.";
              }
            }  // list server-address
          }  // container server-addresses
        }  // list server-group
      }  // container server-groups

      container global-packet-statistics {
        config false;
        description
          "Statistics of a DHCPv6 relay global packet.";
        leaf received-from-clients {
          type uint32;
          description
            "Packets received from clients.";
        }

        leaf solicit-received {
          type uint32;
          description
            "Solicit packets received from clients.";
        }

        leaf request-received {
          type uint32;
          description
            "Request packets received from clients.";
        }

        leaf confirm-received {
          type uint32;
          description
            "Confirm packets received from clients.";
        }

        leaf renew-received {
          type uint32;
          description
            "Renew packets received from clients.";
        }

        leaf rebind-received {
          type uint32;
          description
            "Rebind packets received from clients.";
        }

        leaf decline-received {
          type uint32;
          description
            "Decline packets received from clients.";
        }

        leaf release-received {
          type uint32;
          description
            "Release packets received from clients.";
        }

        leaf inform-received {
          type uint32;
          description
            "Information-request packets received from clients.";
        }

        leaf received-from-relay-agents-or-servers {
          type uint32;
          description
            "Packets received from relay agents or servers.";
        }

        leaf relay-forward-received {
          type uint32;
          description
            "Relay-forward packets received from relay agents or servers.";
        }

        leaf relay-reply-received {
          type uint32;
          description
            "Relay-reply packets received from relay agents or servers.";
        }

        leaf sent-to-clients {
          type uint32;
          description
            "Packets sent to clients.";
        }

        leaf advertise-send {
          type uint32;
          description
            "Advertise packets sent to clients.";
        }

        leaf reply-send {
          type uint32;
          description
            "Relay-reply packets sent to clients.";
        }

        leaf reconfig-send {
          type uint32;
          description
            "Reconfigure packets sent to clients.";
        }

        leaf sent-to-relay-agents-or-servers {
          type uint32;
          description
            "Packets sent to relay agents or servers.";
        }

        leaf relay-forward-send {
          type uint32;
          description
            "Relay-forward packets sent to relay agents or servers.";
        }

        leaf relay-reply-send {
          type uint32;
          description
            "Relay-reply packets sent to relay agents or servers.";
        }

        leaf bad-packets-received {
          type uint32;
          description
            "Error packets received.";
        }

        leaf total-drop-packets {
          type uint32;
          description
            "Total dropped packets.";
        }

        leaf drop-packets-for-table-full {
          type uint32;
          description
            "Packets discarded because the table is full.";
        }

        leaf drop-packets-for-general-error {
          type uint32;
          description
            "Packets discarded due to general errors.";
        }

        leaf drop-packets-for-ipsec-authentication-fail {
          type uint32;
          description
            "Packets discarded due to IPsec authentication failures.";
        }
      }  // container global-packet-statistics

      container user-infos {
        config false;
        description
          "List of user informations.";
        list user-info {
          key "index";
          description
            "Operational state of user informations.";
          leaf index {
            type uint32;
            description "User index.";
          }

          leaf client-duid {
            ext:support-filter "true";
            type string {
              length "1..256";
            }
            description "Client DUID.";
          }

          leaf iaid {
            type uint32;
            default "0";
            description
              "Identity association identifier.";
          }

          leaf ia-type {
            type ia-type;
            description
              "Identity association type.";
          }

          leaf server-duid {
            ext:support-filter "true";
            type string {
              length "1..256";
            }
            description "Server DUID.";
          }

          leaf server-address {
            ext:support-filter "true";
            type inet:ipv6-address-no-zone;
            description
              "Server IPv6 address.";
          }

          leaf if-name {
            ext:support-filter "true";
            type leafref {
              path
                "/ifm:ifm/ifm:interfaces/ifm:interface/ifm:name";
            }
            description "Interface name.";
          }

          leaf pe-vlan {
            type uint16;
            default "1";
            description "PE VLAN ID.";
          }

          leaf ce-vlan {
            type uint16;
            description "CE VLAN ID.";
          }

          leaf vpn-name {
            ext:support-filter "true";
            type leafref {
              path
                "/ni:network-instance/ni:instances/ni:instance/ni:name";
            }
            description "VPN name.";
          }

          leaf client-mac {
            ext:support-filter "true";
            type pub-type:mac-address;
            description
              "Client MAC address.";
          }

          leaf rapid-commit {
            type rapid-commit-flag-type;
            description
              "Rapid Commit option.";
          }

          leaf transaction-id {
            type uint32;
            description "Transaction ID.";
          }

          leaf info-transaction-id {
            type uint32;
            description
              "Info transaction ID.";
          }

          container iana-infos {
            description
              "List of identifying association for non-temporary addresses.";
            list iana-info {
              key "ipv6-address";
              description
                "Operational state of identifying association for non-temporary addresses.";
              leaf ipv6-address {
                ext:support-filter "true";
                type inet:ipv6-address-no-zone;
                description "IPv6 address.";
              }

              leaf server-duid {
                type string {
                  length "1..256";
                }
                description "Server DUID.";
              }

              leaf server-address {
                type inet:ipv6-address-no-zone;
                description
                  "Server IPv6 address.";
              }

              leaf valid-time {
                type string {
                  length "0..30";
                }
                description "Valid time.";
              }

              leaf lease {
                type uint32;
                units "s";
                description "Lease time.";
              }

              leaf remain-lease {
                type uint32;
                units "s";
                description
                  "Remaining lease.";
              }

              leaf status {
                type relay-table-status;
                description "Table status.";
              }
            }  // list iana-info
          }  // container iana-infos

          container iapd-infos {
            description
              "List of identifying association for prefix delegation.";
            list iapd-info {
              key "ipv6-address";
              description
                "Operational state of identifying association for prefix delegation.";
              leaf ipv6-address {
                ext:support-filter "true";
                type inet:ipv6-address-no-zone;
                description "IPv6 address.";
              }

              leaf prefix {
                type uint32;
                description
                  "IPv6 address prefix.";
              }

              leaf server-duid {
                type string {
                  length "1..256";
                }
                description "Server DUID.";
              }

              leaf server-address {
                type inet:ipv6-address-no-zone;
                description
                  "Server IPv6 address.";
              }

              leaf valid-time {
                type string {
                  length "0..30";
                }
                description "Valid time.";
              }

              leaf lease {
                type uint32;
                units "s";
                description "Lease time.";
              }

              leaf remain-lease {
                type uint32;
                units "s";
                description
                  "Remaining lease.";
              }

              leaf status {
                type relay-table-status;
                description "Table status.";
              }
            }  // list iapd-info
          }  // container iapd-infos
        }  // list user-info
      }  // container user-infos
    }  // grouping dhcpv6-relay-type
  }  // submodule huawei-dhcpv6-relay