module ietf-dhcpv6-options {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-options";
  prefix "dhcpv6-options";

  import ietf-inet-types {
    prefix inet;
  }
  import ietf-yang-types {
    prefix yang;
  }
  import ietf-dhcpv6-types {
    prefix dhcpv6-types;
  }

  organization "DHC WG";
  contact
   "cuiyong@tsinghua.edu.cn
    wangh13@mails.tsinghua.edu.cn
    lh.sunlinh@gmail.com
    ian.farrer@telekom.de
    sladjana.zechlin@telekom.de
    hezihao9512@gmail.com";

  description "This model defines a YANG data model that can be
    used to configure DHCPv6 options.";

  revision 2018-09-04 {
    description "";
    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
  }
  revision 2018-03-04 {
    description "Resolved most issues on the DHC official
    github";
    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
  }

  revision 2017-12-22 {
          description "Resolve most issues on Ian's github.";
          reference "I-D: draft-ietf-dhc-dhcpv6-yang";
  }

  revision 2017-11-24 {
    description "First version of the separated DHCPv6 options
      YANG model.";
    reference "I-D:draft-ietf-dhc-dhcpv6-yang";
  }

  /*
   * Features
   */

  //  features for server options
        feature server-unicast-op {
                description "Support for Server Unicast option";
        }
        feature sip-server-domain-name-list-op {
                description "Support for SIP Server Domain Name List option";
        }
        feature sip-server-address-list-op {
                description "Support for SIP Server Address List option";
        }
  feature dns-servers-op {
    description "Support for DNS Servers Option";
  }
        feature domain-searchlist-op {
                description "Support for Domain Search List Option";
        }
        feature nis-config-op {
                description "Support for Network Information Service (NIS)
                        Servers option";
        }
        feature nis-plus-config-op {
                description "Support for Network Information Service V2 (NIS+)
                        Servers option";
        }
        feature nis-domain-name-op {
                description "Support for Network Information Service (NIS)
                        Domain Name option";
        }
        feature nis-plus-domain-name-op {
                description "Support for Network Information Service V2 (NIS+)
                        Server option";
        }
        feature sntp-server-op {
                description "Support for Simple Network Protocol Configuration
                        (SNTP) Servers option";
        }
        feature info-refresh-time-op {
                description "Support for Information Refresh Time option";
        }
        feature client-fqdn-op {
                description "Support for Client FQDN option";
        }
        feature posix-timezone-op {
                description "Support for New POIX Timezone option";
        }
        feature tzdb-timezone-op {
                description "Support for New TZDB Timezone option";
        }
        feature ntp-server-op {
                description "Support for Network Time Protocol (NTP)
                        Server option";
        }
        feature boot-file-url-op {
                description "Support for Boot File URL option";
        }
        feature boot-file-param-op {
                description "Support for Boot File Parameters option";
        }
        feature aftr-name-op {
                description "Support for Address Family Transition
                        Router (AFTR) option";
        }
        feature kbr-default-name-op {
                description "Support for Kerberos Default Name
                        Option";
        }
        feature kbr-kdc-op {
                description "Support for Kerberos KDC option";
        }
        feature sol-max-rt-op {
                description "Support for SOL_MAX_RT option";
        }
        feature inf-max-rt-op {
                description "Support for INF_MAX_RT option";
        }
        feature addr-selection-op {
                description "Support for Address Selection opiton";
        }
        feature pcp-server-op {
                description "Support for Port Control Protocol (PCP)
                        option";
        }
        feature s46-rule-op {
                description "Support for S46 Rule option";
        }
        feature s46-br-op {
                description "Support for S46 Border Relay (BR) option";
        }
        feature s46-dmr-op {
                description "Support for S46 Default Mapping Rule
                        (DMR) option";
        }
        feature s46-v4-v6-binding-op {
                description "Support for S46 IPv4/IPv6 Address
                        Bind option";
        }

        // features for relay-supplied options
        feature erp-local-domain-name-op {
                description "Support for ERP Local Domain Name option";
        }

        // features for client options
        feature option-request-op {
                description "Support for Option Request option";
        }
        feature rapid-commit-op {
                description "Support for Rapid Commit option";
        }
        feature user-class-op {
                description "Support for User Class option";
        }
        feature vendor-class-op {
                description "Support for Vendor Class option";
        }
        feature client-arch-type-op {
                description "Support for Client System Architecture
                        Type option";
        }
        feature client-network-interface-identifier-op {
                description "Support for Client Network Interface
                        Identifier option";
        }
        feature kbr-principal-name-op {
                description "Support for Kerberos Principal
                        Name option";
        }
        feature kbr-realm-name-op {
                description "Support Kerberos Realm Name option";
        }
        feature client-link-layer-addr-op {
                description "Support for Client Link-Layer Address
                        Option";
        }

        // features for custom options
        feature operator-op-ipv6-address {
                description "Support for Option with IPv6 Addresses";
        }
        feature operator-op-single-flag {
                description "Support for Option with Single Flag";
        }
        feature operator-op-ipv6-prefix {
                description "Support for Option with IPv6 Prefix";
        }
        feature operator-op-int32 {
                description "Support for Opion with 32-bit
                        Integer Value";
        }
        feature operator-op-int16 {
                description "Support for Opion with 16-bit Integer Value";
        }
        feature operator-op-int8 {
                description "Support for Opion with 8-bit Integer Value";
        }
        feature operator-op-uri {
                description "Support for Opion with URI";
        }
        feature operator-op-textstring {
                description "Support for Opion with Text String";
        }
        feature operator-op-var-data {
                description "Support for Opion with Variable-Length Data";
        }
        feature operator-op-dns-wire {
                description "Support for Opion with DNS Wire
                        Format Domain Name List";
        }

  /*
   * Groupings
   */

  grouping server-option-definitions {
    description "Contains definitions for options configured on the
      DHCPv6 server which will be supplied to clients.";

    container server-unicast-option {
      if-feature server-unicast-op;
      presence "Enable this option";
      description "OPTION_UNICAST (12) Server Unicast Option";
      reference "RFC3315: Dynamic Host Configuration Protocol for
        IPv6 (DHCPv6)";
      leaf server-address {
        type inet:ipv6-address;
        description "server ipv6 address";
      }
    }

    container sip-server-domain-name-list-option {
      if-feature sip-server-domain-name-list-op;
      presence "Enable this option";
      description "OPTION_SIP_SERVER_D (21) SIP Servers Domain Name List";
      reference "RFC3319: Dynamic Host Configuration Protocol
        (DHCPv6) Options for Session Initiation Protocol (SIP) Servers";
      leaf sip-serv-domain-name {
        type string;
        mandatory true;
        description "sip server domain name";
      }
    }

    container sip-server-address-list-option {
      if-feature sip-server-address-list-op;
      presence "Enable this option";
      description "OPTION_SIP_SERVER_A (22) SIP Servers IPv6 Address List";
      reference "RFC3319: Dynamic Host Configuration Protocol (DHCPv6)
        Options for Session Initiation Protocol (SIP) Servers";
      list sip-server {
        key sip-serv-id;
        description "sip server info";
        leaf sip-serv-id {
          type uint8;
          mandatory true;
          description "sip server id";
        }
        leaf sip-serv-addr {
          type inet:ipv6-address;
          mandatory true;
          description "sip server addr";
        }
      }
    }

    container dns-servers-option {
      if-feature dns-servers-op;
      presence "Enable this option";
      description "OPTION_DNS_SERVERS (23) DNS recursive Name Server option";
      reference "RFC3646: DNS Configuration options for Dynamic Host Configuration
        Protocol for IPv6 (DHCPv6)";
      list dns-server {
        key dns-serv-id;
        description "dns server info";
        leaf dns-serv-id {
          type uint8;
          mandatory true;
          description "DNS server list entry ID.";
        }
        leaf dns-serv-addr {
          type inet:ipv6-address;
          mandatory true;
          description "DNS server address.";
        }
      }
    }

    container domain-searchlist-option {
      if-feature domain-searchlist-op;
      presence "Enable this option";
      description "OPTION_DOMAIN_LIST (24) Domain Search List Option";
      reference "RFC3646: DNS Configuration options for Dynamic
        Host Configuration Protocol for IPv6 (DHCPv6)";
      list domain-searchlist {
        key domain-searchlist-id;
        description "dns server info";
        leaf domain-searchlist-id {
          type uint8;
          mandatory true;
          description "Domain seachlist entry ID.";
        }
        leaf domain-search-list-entry {
          type string;
          mandatory true;
          description "Domain search list entry.";
        }
      }
    }
    container nis-config-option {
      if-feature nis-config-op;
      presence "Enable this option";
      description "OPTION_NIS_SERVERS (27) Network Information Service (NIS)
        Servers Option.";
      reference "RFC3898: Network Information Service (NIS) Configuration
        Options for Dynamic Host Configuration Protocol for IPv6 (DHCPv6)";
      list nis-server {
        key nis-serv-id;
        description "nis server info";
        leaf nis-serv-id {
          type uint8;
          mandatory true;
          description "nis server id";
        }
        leaf nis-serv-addr {
          type inet:ipv6-address;
          mandatory true;
          description "nis server addr";
        }
      }
    }

    container nis-plus-config-option {
      if-feature nis-plus-config-op;
      presence "Enable this option";
      description "OPTION_NISP_SERVERS (28): Network Information Service V2
        (NIS+) Servers Option.";
      reference "RFC3989: Network Information Service (NIS) Configuration
        Options for Dynamic Host Configuration Protocol for IPv6 (DHCPv6)";
      list nis-plus-server {
        key nis-plus-serv-id;
        description "NIS+ server information.";
        leaf nis-plus-serv-id {
          type uint8;
          mandatory true;
          description "nisp server id";
        }
        leaf nis-plus-serv-addr {
          type inet:ipv6-address;
          mandatory true;
          description "nisp server addr";
        }
      }
    }

    container nis-domain-name-option {
      if-feature nis-domain-name-op;
      presence "Enable this option";
      description "OPTION_NIS_DOMAIN_NAME (29) Network Information
        Service (NIS) Domain Name Option";
      reference "RFC3989: Network Information Service (NIS)
        Configuration Options for Dynamic Host Configuration Protocol
        for IPv6 (DHCPv6)";
      leaf nis-domain-name {
        type string;
        description "The Network Information Service (NIS) Domain Name
          option is used by the server to convey client's NIS Domain Name
          info to the client.";
      }
    }

    container nis-plus-domain-name-option {
      if-feature nis-plus-domain-name-op;
      presence "Enable this option";
      description "OPTION_NISP_DOMAIN_NAME (30) Network Information
        Service V2 (NIS+) Domain Name Option";
      reference "RFC3989: Network Information Service (NIS)
        Configuration Options for Dynamic Host Configuration Protocol
        for IPv6 (DHCPv6)";
      leaf nis-plus-domain-name {
        type string;
        description "The Network Information Service V2 (NIS+) Domain Name
        option is used by the server to convey client's NIS+ Domain Name
        info to the client.";
      }
    }


    container sntp-server-option {
      if-feature sntp-server-op;
      presence "Enable this option";
      description "OPTION_SNTP_SERVERS (31) Simple Network Time Protocol
        (SNTP) Servers Option";
      reference "RFC4075: Simple Network Time Protocol (SNTP) Configuration
        Option for DHCPv6";
      list sntp-server {
        key sntp-serv-id;
        description "sntp server info";
        leaf sntp-serv-id {
          type uint8;
          mandatory true;
          description "sntp server id";
        }
        leaf sntp-serv-addr {
          type inet:ipv6-address;
          mandatory true;
          description "sntp server addr";
        }
      }
    }

    container info-refresh-time-option {
      if-feature info-refresh-time-op;
      presence "Enable this option";
      description "OPTION_INFORMATION_REFRESH_TIME (32) Information Refresh
        Time option.";
      reference "RFC4242: Information Refresh Time Option for Dynamic Host
        Configuration Protocol for IPv6 (DHCPv6";
      leaf info-refresh-time {
        type yang:timeticks;
        mandatory true;
        description "The refresh time.";
      }
    }

    container client-fqdn-option {
      if-feature client-fqdn-op;
      presence "Enable this option";
      description "OPTION_CLIENT_FQDN (39) DHCPv6 Client FQDN Option";
      reference "RFC4704: The Dynamic Host Configuration Protocol for IPv6
        (DHCPv6) Client Fully Qualified Domain Name (FQDN) Option";
      leaf server-initiate-update {
        type boolean;
        mandatory true;
        description "server initiate";
      }
      leaf client-initiate-update {
        type boolean;
        mandatory true;
        description "client initiate";
      }
      leaf modify-name-from-cli {
        type boolean;
        mandatory true;
        description "modify by client";
      }
    }

    container posix-timezone-option {
      if-feature posix-timezone-op;
      presence "Enable this option";
      description "OPTION_NEW_POSIX_TIMEZONE (41) Posix Timezone option";
      reference "RFC4833: Timezone Options for DHCP";
      leaf tz-posix {
        type string;
        mandatory true;
        description "TZ Posix IEEE 1003.1 String";
      }
    }

    container tzdb-timezone-option {
      if-feature tzdb-timezone-op;
      presence "Enable this option";
      description "OPTION_NEW_TZDB_TIMEZONE (42) Timezone Database option";
      reference "RFC4822: Timezone Options for DHCP";
      leaf tz-database {
        type string;
        mandatory true;
        description "Reference to the TZ Database";
      }
    }

    container ntp-server-option {
      //This option looks like it needs work to correctly model the
      //option as defined in the RFC.

      // Zihao - Re-modelled so it only contains one time source suboption

      if-feature ntp-server-op;
      presence "Enable this option";
      description "OPTION_NTP_SERVER (56) NTP Server Option for DHCPv6";
      reference "RFC5908: Network Time Protocol (NTP) Server Option for
        DHCPv6";
      list ntp-server {
        key ntp-serv-id;
        description "ntp server info";
        leaf ntp-serv-id {
          type uint8;
          mandatory true;
          description "NTP server id";
        }
        choice ntp-time-source-suboption {
                description "Select a NTP time source suboption.";
                case server-address {
                leaf-list ntp-serv-addr-suboption {
                  type inet:ipv6-address;
                  description "NTP server addr";
              }
          }
                case server-multicast-address {
                        leaf-list ntp-serv-mul-addr-suboption {
              type inet:ipv6-address;
                    description "NTP server multicast addr";
            }
                }
                case server-fqdn {
                        leaf-list ntp-serv-fqdn-suboption {
              type string;
              description "NTP server fqdn";
            }
                }
        }
      }
    }

        container boot-file-url-option {
                if-feature boot-file-url-op;
                presence "Enable this option";
                description "OPT_BOOTFILE_URL (59) Boot File URL Option";
                reference "RFC5970: DHCPv6 Options for Network Boot";
                list boot-file {
                        key boot-file-id;
                        description "boot file info";
                        leaf boot-file-id {
                                type uint8;
                                mandatory true;
                                description "boot file id";
                        }
        leaf-list suitable-arch-type {
          type uint16;
          description "architecture type";
        }
        leaf-list suitable-net-if {
                type uint32;
                description "network interface";
        }
                        leaf boot-file-url {
                                type string;
                                mandatory true;
                                description "url for boot file";
                        }
                }
        }

        container boot-file-param-option {
                if-feature boot-file-param-op;
                presence "Enable this option";
                description "OPT_BOOTFiLE_PARAM (60) Boot File Parameters Option";
                reference "RFC5970: DHCPv6 Options for Network Boot";
      list boot-file-paras {
        key para-id;
        description "boot file parameters";
        leaf para-id {
          type uint8;
          mandatory true;
          description "parameter id";
        }
        leaf parameter {
          type string;
          mandatory true;
          description "parameter value";
        }
      }
        }

    container aftr-name-option {
      if-feature aftr-name-op;
      presence "Enable this option";
      description "OPTION_AFTR_NAME (64) AFTR-Name DHCPv6 Option";
      reference "RFC6334: Dynamic Host Configuration Protocol for IPv6
        (DHCPv6) Option for Dual-Stack Lite";
      leaf tunnel-endpoint-name {
        type string;
        mandatory true;
        description "aftr name";
      }
    }

    container kbr-default-name-option {
        if-feature kbr-default-name-op;
        presence "Enable this option";
        description "OPTION_KRB_DEFAULT_REALM_NAME (77) Kerberos Default Realm Name Option";
        reference "RFC6784: Kerberos Options for DHCPv6";
      leaf default-realm-name {
        type string;
        mandatory true;
        description "default realm name";
      }
    }

    container kbr-kdc-option {
        if-feature kbr-kdc-op;
        presence "Enable this option";
        description "OPTION_KRB_KDC (78) Kerberos KDB Option";
        reference "RFC6784: Kerberos Options for DHCPv6";
      list kdc-info {
        key kdc-id;
        description "kdc info";
        leaf kdc-id {
          type uint8;
          mandatory true;
          description "kdc id";
        }
        leaf priority {
          type uint16;
          mandatory true;
          description "priority";
        }
        leaf weight {
          type uint16;
          mandatory true;
          description "weight";
        }
        leaf transport-type {
          type uint8;
          mandatory true;
          description "transport type";
        }
        leaf port-number {
          type uint16;
          mandatory true;
          description "port number";
        }
        leaf kdc-ipv6-addr {
          type inet:ipv6-address;
          mandatory true;
          description "kdc ipv6 addr";
        }
        leaf realm-name {
          type string;
          mandatory true;
          description "realm name";
        }
      }
    }

    container sol-max-rt-option {
      if-feature sol-max-rt-op;
      presence "Enable this option";
      description "OPTION_SOL_MAX_RT (82) sol max rt option";
      reference "RFC7083: Modification to Default Values of
        SOL_MAX_RT and INF_MAX_RT";
        leaf sol-max-rt-value {
          type yang:timeticks;
          mandatory true;
          description "sol max rt value";
        }
    }

    container inf-max-rt-option {
      if-feature inf-max-rt-op;
      presence "Enable this option";
      description "OPTION_INF_MAX_RT (83) inf max rt option";
      reference "RFC7083: Modification to Default Values of
        SOL_MAX_RT and INF_MAX_RT";
      leaf inf-max-rt-value {
        type yang:timeticks;
        mandatory true;
        description "inf max rt value";
      }
    }

    container addr-selection-option {
      if-feature addr-selection-op;
      presence "Enable this option";
      description "OPTION_ADDRSEL (84) and OPTION_ADDRSEL_TABLE (85)";
      reference "RFC7078: Distributing Address Selection Policy Using
        DHCPv6";
      // if - Needs checking to see if this matches the RFC - there
      // are two options here.
      // Zihao - I think this matches RFC7078
      leaf a-bit-set {
        type boolean;
        mandatory true;
        description "a bit";
      }
      leaf p-bit-set {
        type boolean;
        mandatory true;
        description "p bit";
      }
      list policy-table {
        key policy-id;
        description "policy table";
        leaf policy-id {
          type uint8;
          mandatory true;
          description "policy id";
        }
        leaf label {
          type uint8;
          mandatory true;
          description "label";
        }
        leaf precedence {
          type uint8;
          mandatory true;
          description "precedence";
        }
        leaf prefix-len {
          type uint8;
          mandatory true;
          description "prefix length";
        }
        leaf prefix {
          type inet:ipv6-prefix;
          mandatory true;
          description "prefix";
        }
      }
    }

    container pcp-server-option {
      if-feature pcp-server-op;
      presence "Enable this option";
      description "OPTION_V6_PCP_SERVER (86) pcp server option";
      reference "RFC7291: DHCP Options for the Port Control
        Protocol (PCP)";
      list pcp-server {
        key pcp-serv-id;
        description "pcp server info";
        leaf pcp-serv-id {
          type uint8;
          mandatory true;
          description "pcp server id";
        }
        leaf pcp-serv-addr {
          type inet:ipv6-address;
          mandatory true;
          description "pcp server addr";
        }
      }
    }

    container s46-rule-option {
      if-feature s46-rule-op;
      presence "Enable this option";
      description "OPTION_S46_RULE (89) S46 rule option";
      reference "RFC7598: DHCPv6 Options for Configuration of
        Softwire Address and Port-Mapped Clients";
      list s46-rule {
        key rule-id;
        description "s46 rule";
        leaf rule-id {
          type uint8;
          mandatory true;
          description "rule id";
        }
        leaf rule-type {
          type enumeration {
            enum "BMR" {
              description "BMR";
            }
            enum "FMR" {
              description "FMR";
            }
          }
          mandatory true;
          description "rule type";
        }
        leaf prefix4-len {
          type uint8;
          mandatory true;
          description "ipv4 prefix length";
        }
        leaf ipv4-prefix {
          type inet:ipv4-prefix;
          mandatory true;
          description "ipv4 prefix";
        }
        leaf prefix6-len {
          type uint8;
          mandatory true;
          description "ipv6 prefix length";
        }
        leaf ipv6-prefix {
          type inet:ipv6-prefix;
          mandatory true;
          description "ipv6 prefix";
        }
        uses dhcpv6-types:portset-para;
      }
    }

    container s46-br-option {
      if-feature s46-br-op;
      presence "Enable this option";
      description "OPTION_S46_BR (90) S46 BR Option";
      reference "RFC7598: DHCPv6 Options for Configuration of
        Softwire Address and Port-Mapped Clients";
      list br {
        key br-id;
        description "br info";
        leaf br-id {
          type uint8;
          mandatory true;
          description "br id";
        }
        leaf br-ipv6-addr {
          type inet:ipv6-address;
          mandatory true;
          description "br ipv6 addr";
        }
      }
    }

    container s46-dmr-option {
      if-feature s46-dmr-op;
      presence "Enable this option";
      description "OPTION_S46_DMR (91) S46 DMR Option";
      reference "RFC7598: DHCPv6 Options for Configuration of
        Softwire Address and Port-Mapped Clients";
      list dmr {
        key dmr-id;
        description "dmr info";
        leaf dmr-id {
          type uint8;
          mandatory true;
          description "dmr id";
        }
        leaf dmr-prefix-len {
          type uint8;
          mandatory true;
          description "dmr prefix length";
        }
        leaf dmr-ipv6-prefix {
          type inet:ipv6-prefix;
          mandatory true;
          description "dmr ipv6 prefix";
        }
      }
    }

    container s46-v4-v6-binding-option {
      if-feature s46-v4-v6-binding-op;
      presence "Enable this option";
      description "OPTION_S46_V4V6BIND (92) S46 IPv4/IPv6 Address
        Binding option";
      reference "RFC7598: DHCPv6 Options for Configuration of
        Softwire Address and Port-Mapped Clients";
      list ce {
        key ce-id;
        description "ce info";
        leaf ce-id {
          type uint8;
          mandatory true;
          description "ce id";
        }
        leaf ipv4-addr {
          type inet:ipv4-address;
          mandatory true;
          description "ce ipv4 addr";
        }
        leaf bind-prefix6-len {
          type uint8;
          mandatory true;
          description "bind ipv6 prefix
            length";
        }
        leaf bind-ipv6-prefix {
          type inet:ipv6-address;
          mandatory true;
          description "bind ipv6 prefix";
        }
        uses dhcpv6-types:portset-para;
      }
    }

  }
  //if - NB - The list of options needs to be updated.


  grouping relay-supplied-option-definitions {
    // if - The structure here needs to be checked and probably reworked.
    description "OPTION_RSOO (66) Relay-Supplied Options option";
    reference "RFC6422: Relay-Supplied DHCP Options";
    container erp-local-domain-name-option {
      if-feature erp-local-domain-name-op;
      presence "Enable this option";
      description "OPTION_ERP_LOCAL_DOMAIN_NAME (65) DHCPv6 ERP Local
        Domain Name Option";
      reference "RFC6440: The EAP Re-authentication Protocol (ERP)
        Local Domain Name DHCPv6 Option";
      list erp-for-client {
        key cli-id;
        description "erp for client";
        leaf cli-id {
          type uint32;
          mandatory true;
          description "client id";
        }
        container duid {
          description "Sets the DUID";
          // uses duid;
          // if - Maybe DUID definition needs to be moved to this module.
          uses dhcpv6-types:duid;
        }
        leaf erp-name {
          type string;
          mandatory true;
          description "erp name";
        }
      }
    }
  }

  grouping client-option-definitions {
    description "Contains definitions for options configured on the
      DHCPv6 client which will be sent to the server.";

    list new-or-standard-cli-option {
      key option-code;
      description "new or standard client option";
      leaf option-code {
        type uint16;
        mandatory true;
        description "option code";
      }
      leaf option-name {
        type string;
        mandatory true;
        description "option name";
      }
      leaf option-description {
        type string;
        mandatory true;
        description "description of client
          option";
      }
      leaf option-reference {
        type string;
        description "the reference of option";
      }
      leaf option-value {
        type string;
        mandatory true;
        description "the option value";
      }
    }

    container option-request-option {
      if-feature option-request-op;
      presence "Enable this option";
      description "OPTION_ORO (6) Option Request Option";
      reference "RFC3315: Dynamic Host Configuration Protocol for
      IPv6 (DHCPv6)";
      list oro-option {
        key option-code;
        description "oro option";
        leaf option-code {
          type uint16;
          mandatory true;
          description "option code";
        }
        leaf description {
          type string;
          mandatory true;
          description "description of oro
            options";
        }
      }
    }

    container user-class-option {
      if-feature user-class-op;
      presence "Enable this option";
      description "OPTION_USER_CLASS (15) User Class Option";
      reference "RFC3315: Dynamic Host Configuration Protocol
        for IPv6 (DHCPv6)";
      list user-class {
        key user-class-id;
        description "user class";
        leaf user-class-id {
          type uint8;
          mandatory true;
          description "user class id";
        }
        leaf user-class-data {
          type string;
          mandatory true;
          description "The information contained in the data area
            of this option is contained in one or more opaque
            fields that represent the user class or classes of
            which the client is a member. ";
        }
      }
    }

    container vendor-class-option {
      if-feature vendor-class-op;
      presence "Enable this option";
      description "OPTION_VENDOR_CLASS (16) Vendor Class Option";
      reference "RFC3315: Dynamic Host Configuration Protocol
        for IPv6 (DHCPv6)";
      leaf enterprise-number {
        type uint32;
        mandatory true;
        description "enterprise number";
      }
      list vendor-class {
          key vendor-class-id;
          description "vendor class";
        leaf vendor-class-id {
          type uint8;
          mandatory true;
          description "vendor class id";
        }
        leaf vendor-class-data {
          type string;
          mandatory true;
          description "The vendor-class-data is composed of a series of
            separate items, each of which describes some characteristic
            of the client's hardware configuration. Examples of
            vendor-class-data instances might include the version of the
            operating system the client is running or the amount of memory
            installed on the client.";
        }
      }
    }

    container client-fqdn-option {
      if-feature client-fqdn-op;
      presence "Enable this option";
      description "OPTION_CLIENT_FQDN (39) The Dynamic Host
        Configuration Protocol for IPv6 (DHCPv6) Client Fully
        Qualified Domain Name (FQDN) Option";
      reference "RFC4704: The Dynamic Host Configuration Protocol
        for IPv6 (DHCPv6) Client Fully Qualified Domain Name (FQDN)
        Option";
      leaf fqdn {
        type string;
        mandatory true;
        description "fqdn";
      }
      leaf server-initiate-update {
        type boolean;
        mandatory true;
        description "whether server initiate";
      }
      leaf client-initiate-update {
        type boolean;
        mandatory true;
        description "whether client initiate";
      }
    }

    container client-arch-type-option {
      if-feature client-arch-type-op;
      presence "Enable this option";
      description "OPTION_CLIENT_ARCH_TYPE (61) Client System
        Architecture Type Option";
      reference "RFC5970: DHCPv6 Options for Network Boot";
      list architecture-types {
        key type-id;
        description "architecture types";
        leaf type-id {
          type uint16;
          mandatory true;
          description "type id";
        }
        leaf most-preferred {
          type boolean;
          mandatory true;
          description "most preferred flag";
        }
      }
    }

    container client-network-interface-identifier-option {
      if-feature client-network-interface-identifier-op;
      presence "Enable this option";
      description "OPTION_NII (62) Client Network Interface
          Identifier Option";
      reference "RFC5970: DHCPv6 Options for Network Boot";
      leaf type {
        type uint8;
        mandatory true;
        description "type";
      }
      leaf major {
        type uint8;
        mandatory true;
        description "major";
      }
      leaf minor {
        type uint8;
        mandatory true;
        description "minor";
      }
    }

    container kbr-principal-name-option {
      if-feature kbr-principal-name-op;
      presence "Enable this option";
      description "OPTION_KRB_PRINCIPAL_NAME (75) Kerberos
        Principal Name Option";
      reference "RFC6784: Kerberos Options for DHCPv6";
      list principle-name {
          key principle-name-id;
          description "principle name";
          leaf principle-name-id {
                  type uint8;
                  mandatory true;
                  description "principle name id";
          }
          leaf name-type {
                  type int32;
                  mandatory true;
                  description "This field specifies the type of name that follows.";
          }
          leaf name-string {
                  type string;
                  mandatory true;
                  description "This field encodes a sequence of components that form
                          a name, each component encoded as a KerberoString";
          }
      }
    }

    container kbr-realm-name-option {
        if-feature kbr-realm-name-op;
        presence "Enable this option";
        description "OPTION_KRB_REALM_NAME (76) Kerberos Realm Name Option";
        reference "RFC6784: Kerberos Options for DHCPv6";
        leaf realm-name {
                type string;
                mandatory true;
                description "realm name";
        }
    }

    container client-link-layer-addr-option {
      if-feature client-link-layer-addr-op;
      presence "Enable this option";
      description "OPTION_CLIENT_LINKLAYER_ADDR (79) DHCPv6 Client
        Link-Layer Address Option";
      reference "RFC6939: Client Link-Layer Address Option in
        DHCPv6";
      leaf link-layer-type {
        type uint16;
        mandatory true;
        description "Client link-layer address type. The link-layer
          type MUST be a valid hardware type assigned by the IANA,
          as described in [RFC0826]";
      }
      leaf link-layer-addr {
        type string;
        mandatory true;
        description "Client link-layer address";
      }
    }

  }


  grouping custom-option-definitions {
    description "operator customized options";

    container operator-option-ipv6-address {
      if-feature operator-op-ipv6-address;
      presence "Enable this option";
      description "operator ipv6 address option";
      reference "RFC7227: Guidelines for Creating New DHCPv6 Options";
      list operator-ipv6-addr {
        key operator-ipv6-addr-id;
        description "operator ipv6 address info";
        leaf operator-ipv6-addr-id {
          type uint8;
          mandatory true;
          description "operator ipv6 address id";
        }
        leaf operator-ipv6-addr {
          type inet:ipv6-address;
          mandatory true;
          description "operator ipv6 address id";
        }
      }
    }

    container operator-option-single-flag {
      if-feature operator-op-single-flag;
      presence "Enable this option";
      description "operator single flag";
      reference "RFC7227: Guidelines for Creating New DHCPv6
        Options";
      list flag {
        key flag-id;
        description "operator single flag info";
        leaf flag-id {
          type uint8;
          mandatory true;
          description "operator single flag id";
        }
        leaf flag-value{
          type boolean;
          mandatory true;
          description "operator single flag value";
        }
      }
    }

    container operator-option-ipv6-prefix {
      if-feature operator-op-ipv6-prefix;
      presence "Enable this option";
      description "operator ipv6 prefix option";
      reference "RFC7227: Guidelines for Creating New DHCPv6
        Options";
      list operator-ipv6-prefix {
        key operator-ipv6-prefix-id;
        description "operator ipv6 prefix info";
        leaf operator-ipv6-prefix-id {
          type uint8;
          mandatory true;
          description "operator ipv6 prefix id";
        }
        leaf operator-ipv6-prefix6-len {
          type uint8;
          mandatory true;
          description "operator ipv6 prefix length";
        }
        leaf operator-ipv6-prefix {
          type inet:ipv6-prefix;
          mandatory true;
          description "operator ipv6 prefix";
        }
      }
    }

    container operator-option-int32 {
      if-feature operator-op-int32;
      presence "Enable this option";
      description "operator integer 32 option";
      reference "RFC7227: Guidelines for Creating New DHCPv6
        Options";
      list int32val {
        key int32val-id;
        description "operator integer 32 info";
        leaf int32val-id {
          type uint8;
          mandatory true;
          description "operator integer 32 id";
        }
        leaf int32val {
          type uint32;
          mandatory true;
          description "operator integer 32 value";
        }
      }
    }

    container operator-option-int16 {
      if-feature operator-op-int16;
      presence "Enable this option";
      description "operator integer 16 option";
      reference "RFC7227: Guidelines for Creating New DHCPv6
        Options";
      list int16val {
        key int16val-id;
        description "operator integer 16 info";
        leaf int16val-id {
          type uint8;
          mandatory true;
          description "operator integer 16 id";
        }
        leaf int16val {
          type uint16;
          mandatory true;
          description "operator integer 16 value";
        }
      }
    }

    container operator-option-int8 {
      if-feature operator-op-int8;
      presence "Enable this option";
      description "operator integer 8 option";
      reference "RFC7227: Guidelines for Creating New DHCPv6
        Options";
      list int8val {
        key int8val-id;
        description "operator integer 8 info";
        leaf int8val-id {
          type uint8;
          mandatory true;
          description "operator integer 8 id";
        }
        leaf int8val {
          type uint8;
          mandatory true;
          description "operator integer 8 value";
        }
      }
    }

    container operator-option-uri {
      if-feature operator-op-uri;
      presence "Enable this option";
      description "operator uri option";
      reference "RFC7227: Guidelines for Creating New DHCPv6 Options";
      list uri{
        key uri-id;
        description "operator uri info";
        leaf uri-id {
          type uint8;
          mandatory true;
          description "operator uri id";
        }
        leaf uri {
          type string;
          mandatory true;
          description "operator uri value";
        }
      }
    }

    container operator-option-textstring {
      if-feature operator-op-textstring;
      presence "Enable this option";
      description "operator itext string option";
      reference "RFC7227: Guidelines for Creating New DHCPv6 Options";
      list textstring{
        key textstring-id;
        description "operator text string info";
        leaf textstring-id {
          type uint8;
          mandatory true;
          description "operator text string id";
        }
        leaf textstring {
          type string;
          mandatory true;
          description "operator text string value";
        }
      }
    }

    container operator-option-var-data {
      if-feature operator-op-var-data;
      presence "Enable this option";
      description "operator variable length data option";
      reference "RFC7227: Guidelines for Creating New DHCPv6 Options";
      list int32val {
        key var-data-id;
        description "operator ivariable length data info";
        leaf var-data-id {
          type uint8;
          mandatory true;
          description "operator variable length id";
        }
        leaf var-data {
          type binary;
          mandatory true;
          description "operator variable length value";
        }
      }
    }

    container operator-option-dns-wire {
      if-feature operator-op-dns-wire;
      presence "Enable this option";
      description "operator dns wire format domain name list option";
      reference "RFC7227: Guidelines for Creating New DHCPv6
        Options";
      list operator-option-dns-wire {
        key operator-option-dns-wire-id;
        description "operator dns wire format info";
        leaf operator-option-dns-wire-id {
          type uint8;
          mandatory true;
          description "operator dns wire format id";
        }
        leaf operator-option-dns-wire{
          type binary;
          mandatory true;
          description "operator dns wire format value";
        }
      }
    }

  }
}