module fujitsu-ip {

    yang-version 1;

    namespace
      "urn:fujitsu:params:xml:ns:yang:ietf-ip-ext";

    prefix fujitsu-ip;

    import ietf-interfaces {
      prefix if;
    }
    import ietf-ip {
      prefix ip;
    }
    import ietf-yang-types {
      prefix yang;
    }

    organization "Fujitsu Ltd.";

    contact
      "Fujitsu Ltd.
     
     Address: 2801 Telecom Parkway
     Richardson, Texas 75082
     
     Tel: +1-800-USE-FTAC (1-800-873-3822)
     Email: ftac@fnc.fujitsu.com
     Web: www.fujitsu.com/us/services/telecom";

    description
      "This file contains the extensions
     for the ietf ip yang model.
     
      Copyright (c) 2016 Fujitsu Ltd.
        All rights reserved. ";

    revision "2018-07-13" {
      description
        "Provided support for configuring E1:1 interface at IP level";
    }

    revision "2018-04-17" {
      description
        "Inclusion of Address-src validation for IP over PPP interface";
    }

    revision "2018-01-22" {
      description
        "Changed filename, module name, and prefix";
    }

    revision "2017-12-13" {
      description
        "Address-src leaf type changed from enum to leafref";
    }

    revision "2017-07-07" {
      description
        "Yang optimization changes.";
    }

    revision "2017-06-01" {
      description
        "Added validation call point for nextmask and prefix length";
    }

    revision "2017-04-19" {
      description
        "Added support for SC-E1/2";
    }

    revision "2017-04-10" {
      description
        "Added support for E2 ports for ip numbered interfaces";
    }

    revision "2017-03-06" {
      description
        "OSC interface specific validations are made generic to support E-SC-E2 interface";
    }


    augment /if:interfaces/if:interface/ip:ipv4/ip:address/ip:subnet {
      leaf netmask {
        type yang:dotted-quad;
        must
          "not(((current()/../../../if:name = 'ip-1/0/0/NEM') or (current()/../../../if:name = 'ip-200/0/0/NEM'))) or current() = '255.255.255.255'" {
          error-message
            "The netmask of NEM interface shall be 255.255.255.255";
        }
        description
          "The subnet specified as a contiguous netmask.";
      }
    }

    augment /if:interfaces/if:interface/ip:ipv4/ip:address {
      leaf preferred {
        type enumeration {
          enum "true" {
            value 1;
          }
          enum "false" {
            value 0;
          }
        }
        must
          "count(../../ip:address[fujitsu-ip:preferred='true'])=1" {
          error-message
            "one NEM IP Address should be exclusively be marked as preferred";
        }
        default "false";
        description
          "Mark address availablity for unnumbered interface use.";
      }
    }

    augment /if:interfaces-state/if:interface/ip:ipv4/ip:address {
      leaf prefix-length {
        type uint8 {
          range "0..32";
        }
      }
    }

    augment /if:interfaces/if:interface/ip:ipv4 {
      leaf update-addr {
        type enumeration {
          enum "0" {
            value 0;
          }
          enum "1" {
            value 1;
          }
        }
        default "0";
      }

      leaf address-src {
        type leafref {
          path "/if:interfaces/if:interface/if:name";
        }
        must
          "count (/if:interfaces/if:interface[if:name=current()]/if:name) > 0" {
          error-message
            "The interface referenced as ipv4 address-src shall exist";
        }
        must
          "/if:interfaces/if:interface[if:name=current()]/if:enabled = 'true'" {
          error-message
            "The interface referenced as ipv4 address-src shall be enabled";
        }
        must
          "count (/if:interfaces/if:interface[if:name=current()]/ip:ipv4/ip:address/ip:ip) > 0" {
          error-message
            "The interface referenced as ipv4 address-src shall exist and shall have an ip address";
        }
        description
          "The source of the shared IP address for unnumbered IP interface.";
      }

      leaf address-force {
        type leafref {
          path "/if:interfaces/if:interface/ip:ipv4/ip:address/ip:ip";
        }
        must
          "/if:interfaces/if:interface[if:name='ip-1/0/0/NEM']/ip:ipv4/ip:address[ip:ip=current()]/ip:ip = current() or 
         /if:interfaces/if:interface[if:name='ip-200/0/0/NEM']/ip:ipv4/ip:address[ip:ip=current()]/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";
      }
    }
  }  // module fujitsu-ip