module org-openroadm-ip {

    yang-version 1;

    namespace "http://org/openroadm/ip";

    prefix org-openroadm-ip;

    import org-openroadm-device {
      prefix org-openroadm-device;
      revision-date "2021-12-10";
    }
    import org-openroadm-interfaces {
      prefix openROADM-if;
      revision-date "2019-11-29";
    }
    import ietf-inet-types {
      prefix inet;
      revision-date "2013-07-15";
    }
    import ietf-yang-types {
      prefix yang;
      revision-date "2013-07-15";
    }

    organization "Open ROADM MSA";

    contact "OpenROADM.org";

    description
      "This model defines Yang model for IP (IPv4 and IPv6) interfaces.

     This model reuses data items defined in the IETF YANG model for
     interfaces described by RFC 7277.

     Some attributes which are not required in Open ROADM MSA are removed.
     Yang file included are changed to fit into Open ROADM MSA yang structure.

     IETF code is subject to the following copyright and license:
     Copyright (c) IETF Trust and the persons identified as authors of
     the code.
     All rights reserved.

     Redistribution and use in source and binary forms, with or without
     modification, is permitted pursuant to, and subject to the license
     terms contained in, the Simplified BSD License set forth in
     Section 4.c of the IETF Trust's Legal Provisions Relating
     to IETF Documents (http://trustee.ietf.org/license-info).";

    revision "2021-12-10" {
      description "Version 10.1";
    }

    revision "2021-09-24" {
      description "Version 10.0";
    }

    revision "2021-05-28" {
      description "Version 9.1";
    }

    revision "2021-03-26" {
      description "Version 9.0";
    }

    revision "2020-12-11" {
      description "Version 8.1";
    }

    revision "2020-09-25" {
      description "Version 8.0";
    }

    revision "2020-05-29" {
      description "Version 7.1.0";
    }

    revision "2020-03-27" {
      description "Version 7.0.0";
    }

    revision "2019-11-29" {
      description "Version 6.1.0";
    }

    revision "2019-09-27" {
      description "Version 6.0.0";
    }

    revision "2019-05-31" {
      description "Version 5.1.0";
    }

    revision "2019-03-29" {
      description "Version 5.0.0";
    }

    revision "2014-06-16" {
      description "Initial revision.";
      reference
        "RFC 7277: A YANG Data Model for IP Management";

    }


    feature ipv4-non-contiguous-netmasks {
      description
        "Indicates support for configuring non-contiguous
       subnet masks.";
    }

    feature ipv6-privacy-autoconf {
      description
        "Indicates support for Privacy Extensions for Stateless Address
       Autoconfiguration in IPv6.";
      reference
        "RFC 4941: Privacy Extensions for Stateless Address
        	  Autoconfiguration in IPv6";

    }

    typedef ip-address-origin {
      type enumeration {
        enum "other" {
          value 0;
          description
            "None of the following.";
        }
        enum "static" {
          value 1;
          description
            "Indicates that the address has been statically
           configured - for example, using NETCONF or a Command Line
           Interface.";
        }
        enum "dhcp" {
          value 2;
          description
            "Indicates an address that has been assigned to this
           system by a DHCP server.";
        }
        enum "link-layer" {
          value 3;
          description
            "Indicates an address created by IPv6 stateless
           autoconfiguration that embeds a link-layer address in its
           interface identifier.";
        }
        enum "random" {
          value 4;
          description
            "Indicates an address chosen by the system at

           random, e.g., an IPv4 address within 169.254/16, an
           RFC 4941 temporary address, or an RFC 7217 semantically
           opaque address.";
          reference
            "RFC 4941: Privacy Extensions for Stateless Address
            	  Autoconfiguration in IPv6
             RFC 7217: A Method for Generating Semantically Opaque
            	  Interface Identifiers with IPv6 Stateless
            	  Address Autoconfiguration (SLAAC)";

        }
      }
      description
        "The origin of an address.";
    }

    typedef neighbor-origin {
      type enumeration {
        enum "other" {
          value 0;
          description
            "None of the following.";
        }
        enum "static" {
          value 1;
          description
            "Indicates that the mapping has been statically
           configured - for example, using NETCONF or a Command Line
           Interface.";
        }
        enum "dynamic" {
          value 2;
          description
            "Indicates that the mapping has been dynamically resolved
           using, e.g., IPv4 ARP or the IPv6 Neighbor Discovery
           protocol.";
        }
      }
      description
        "The origin of a neighbor entry.";
    }

    grouping ip-grp {
      description "Grouping for ip";
      container ipv4 {
        presence
          "Enables IPv4 unless the 'enabled' leaf
                (which defaults to 'true') is set to 'false'";
        description
          "Parameters for the IPv4 address family.";
        leaf enabled {
          type boolean;
          default "false";
          description
            "Controls whether IPv4 is enabled or disabled on this
           interface.  When IPv4 is enabled, this interface is
           connected to an IPv4 stack, and the interface can send
           and receive IPv4 packets.";
        }

        leaf forwarding {
          type boolean;
          default "false";
          description
            "Controls IPv4 packet forwarding of datagrams received by,
           but not addressed to, this interface.  IPv4 routers
           forward datagrams.  IPv4 hosts do not (except those
           source-routed via the host).";
        }

        leaf mtu {
          type uint16 {
            range "68..max";
          }
          units "octets";
          default "1500";
          description
            "The size, in octets, of the largest IPv4 packet that the
           interface will send and receive.

           The server may restrict the allowed values for this leaf,
           depending on the interface's type.

           If this leaf is not configured, the operationally used MTU
           depends on the interface's type.

           The max value supported must be at least 9000.";
          reference
            "RFC 791: Internet Protocol";

        }

        leaf address-src {
          when
            "/org-openroadm-device:org-openroadm-device/org-openroadm-device:interface[org-openroadm-device:name='UNNUMBERED']";
          type enumeration {
            enum "NEM" {
              value 1;
            }
          }
          description
            "The source of the shared IP address for unnumbered IP interface.";
        }

        leaf address-force {
          when
            "/org-openroadm-device:org-openroadm-device/org-openroadm-device:interface[org-openroadm-device:name='UNNUMBERED']";
          type leafref {
            path "/org-openroadm-device:org-openroadm-device/org-openroadm-device:interface/org-openroadm-ip:ipv4/org-openroadm-ip:address/org-openroadm-ip:ip";
          }
          must
            "/org-openroadm-device:org-openroadm-device/org-openroadm-device:interface[org-openroadm-device:name='NEM']/org-openroadm-ip:ipv4/org-openroadm-ip:address[org-openroadm-ip:ip=current()]/org-openroadm-ip:ip = current()" {
            error-message
              "IP address shall be sourced from the NEM interface only";
          }
          must 'not (../address-src)' {
            error-message
              "Both address-src & address-force cannot be configured at the same time";
          }
          description
            "The IP address to use for the unnumbered interface";
        }

        list address {
          key "ip";
          description
            "The list of configured IPv4 addresses on the interface.";
          leaf ip {
            type inet:ipv4-address-no-zone;
            description
              "The IPv4 address on the interface.";
          }

          leaf preferred {
            when
              "/org-openroadm-device:org-openroadm-device/org-openroadm-device:interface[org-openroadm-device:name='NEM']";
            type enumeration {
              enum "true" {
                value 1;
              }
              enum "false" {
                value 0;
              }
            }
            default "false";
            description
              "Mark address availability for unnumbered interface use.";
          }

          choice subnet {
            mandatory true;
            description
              "The subnet can be specified as a prefix-length, or,
             if the server supports non-contiguous netmasks, as
             a netmask.";
            leaf prefix-length {
              type uint8 {
                range "0..32";
              }
              description
                "The length of the subnet prefix.";
            }
            leaf netmask {
              if-feature ipv4-non-contiguous-netmasks;
              type yang:dotted-quad;
              description
                "The subnet specified as a netmask.";
            }
          }  // choice subnet
        }  // list address
      }  // container ipv4

      container ipv6 {
        presence
          "Enables IPv6 unless the 'enabled' leaf
                (which defaults to 'true') is set to 'false'";
        description
          "Parameters for the IPv6 address family.";
        leaf enabled {
          type boolean;
          default "false";
          description
            "Controls whether IPv6 is enabled or disabled on this
           interface.  When IPv6 is enabled, this interface is
           connected to an IPv6 stack, and the interface can send
           and receive IPv6 packets.";
        }

        leaf forwarding {
          type boolean;
          default "false";
          description
            "Controls IPv6 packet forwarding of datagrams received by,
           but not addressed to, this interface.  IPv6 routers
           forward datagrams.  IPv6 hosts do not (except those
           source-routed via the host).";
          reference
            "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)
            	  Section 6.2.1, IsRouter";

        }

        leaf mtu {
          type uint32 {
            range "1280..1500";
          }
          units "octets";
          default "1500";
          description
            "The size, in octets, of the largest IPv6 packet that the
           interface will send and receive.

           The server may restrict the allowed values for this leaf,
           depending on the interface's type.

           If this leaf is not configured, the operationally used MTU
           depends on the interface's type.";
          reference
            "RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
            	  Section 5";

        }

        list address {
          key "ip";
          description
            "The list of configured IPv6 addresses on the interface.";
          leaf ip {
            type inet:ipv6-address-no-zone;
            description
              "The IPv6 address on the interface.";
          }

          leaf prefix-length {
            type uint8 {
              range "0..128";
            }
            mandatory true;
            description
              "The length of the subnet prefix.";
          }
        }  // list address
      }  // container ipv6
    }  // grouping ip-grp

    augment /org-openroadm-device:org-openroadm-device/org-openroadm-device:interface {
      when
        "org-openroadm-device:type = 'openROADM-if:ip'";
      description
        "Parameters for configuring IP on interfaces.

       If an interface is not capable of running IP, the server
       must not allow the client to configure these parameters.";
      uses ip-grp;
    }
  }  // module org-openroadm-ip