module frr-vrrpd {
  yang-version 1.1;
  namespace "http://frrouting.org/yang/vrrpd";
  prefix frr-vrrpd;

  import ietf-inet-types {
    prefix inet;
  }

  import ietf-yang-types {
    prefix yang;
  }

  import frr-interface {
    prefix frr-interface;
  }

  organization
    "FRRouting";
  contact
    "FRR Users List:       <mailto:frog@lists.frrouting.org>
     FRR Development List: <mailto:dev@lists.frrouting.org>";
  description
    "This module defines a model for managing FRR vrrpd daemon.";

  revision 2019-09-09 {
    description
      "Initial revision.";
  }

  grouping ip-vrrp-config {
    description
      "Configuration data for VRRP on IP interfaces";
    leaf virtual-router-id {
      type uint8 {
        range "1..255";
      }
      description
        "Set the virtual router id for use by the VRRP group. This
         usually also determines the virtual MAC address that is
         generated for the VRRP group";
    }

    leaf version {
      type enumeration {
        enum "2" {
          value 2;
          description
            "VRRP version 2.";
        }
        enum "3" {
          value 3;
          description
            "VRRP version 3.";
        }
      }
      default "3";
    }

    leaf priority {
      type uint8 {
        range "1..254";
      }
      default "100";
      description
        "Specifies the sending VRRP interface's priority
         for the virtual router. Higher values equal higher
         priority";
    }

    leaf preempt {
      type boolean;
      default "true";
      description
        "When set to true, enables preemption by a higher
         priority backup router of a lower priority master router";
    }

    leaf accept-mode {
      type boolean;
      default "true";
      description
        "Configure whether packets destined for
         virtual addresses are accepted even when the virtual
         address is not owned by the router interface";
    }

    leaf advertisement-interval {
      type uint16 {
        range "1..4095";
      }
      units "centiseconds";
      default "100";
      description
        "Sets the interval between successive VRRP
         advertisements -- RFC 5798 defines this as a 12-bit
         value expressed as 0.1 seconds, with default 100, i.e.,
         1 second. Several implementation express this in units of
         seconds";
    }

    leaf shutdown {
      type boolean;
      default "false";
      description
        "Administrative shutdown for this VRRP group.";
    }
  }

  grouping ip-vrrp-state {
    description
      "Grouping for operational state data for a virtual router";
    leaf current-priority {
      type uint8;
      config false;
      description
        "Operational value of the priority for the
         interface in the VRRP group.";
    }

    leaf vrrp-interface {
      type frr-interface:interface-ref;
      config false;
      description
        "The interface used to transmit VRRP traffic.";
    }

    leaf source-address {
      type inet:ip-address;
      config false;
      description
        "The source IP address used for VRRP advertisements.";
    }

    leaf state {
      type enumeration {
        enum "Initialize" {
          description
            "State when virtual router is waiting for a Startup event.";
        }
        enum "Master" {
          description
            "State when virtual router is functioning as the forwarding router
             for the virtual addresses.";
        }
        enum "Backup" {
          description
            "State when virtual router is monitoring the availability and state
             of the Master router.";
        }
      }
      config false;
    }

    leaf master-advertisement-interval {
      type uint16 {
        range "0..4095";
      }
      units "centiseconds";
      config false;
      description
        "Advertisement interval contained in advertisements received from the Master.";
    }

    leaf skew-time {
      type uint16;
      units "centiseconds";
      config false;
      description
        "Time to skew Master_Down_Interval.";
    }

    container counter {
      config false;
      leaf state-transition {
        type yang:zero-based-counter32;
        description
          "Number of state transitions the virtual router has experienced.";
      }

      container tx {
        leaf advertisement {
          type yang:zero-based-counter32;
          description
            "Number of sent VRRP advertisements.";
        }
      }

      container rx {
        leaf advertisement {
          type yang:zero-based-counter32;
          description
            "Number of received VRRP advertisements.";
        }
      }
    }
  }

  grouping ip-vrrp-top {
    description
      "Top-level grouping for Virtual Router Redundancy Protocol";
    container vrrp {
      description
        "Enclosing container for VRRP groups handled by this
         IP interface";
      reference
        "RFC 5798 - Virtual Router Redundancy Protocol
         (VRRP) Version 3 for IPv4 and IPv6";
      list vrrp-group {
        key "virtual-router-id";
        description
          "List of VRRP groups, keyed by virtual router id";
        uses ip-vrrp-config;

        container v4 {
          leaf-list virtual-address {
            type inet:ipv4-address;
            description
              "Configure one or more IPv4 virtual addresses for the
               VRRP group";
          }

          uses ip-vrrp-state {
            augment "./counter/tx" {
              leaf gratuitous-arp {
                type yang:zero-based-counter32;
                description
                  "Number of sent gratuitous ARP requests.";
              }
            }
          }
        }

        container v6 {
          when "../version = 3";
          leaf-list virtual-address {
            type inet:ipv6-address;
            description
              "Configure one or more IPv6 virtual addresses for the
               VRRP group";
          }

          uses ip-vrrp-state {
            augment "./counter/tx" {
              leaf neighbor-advertisement {
                type yang:zero-based-counter32;
                description
                  "Number of sent unsolicited Neighbor Advertisements.";
              }
            }
          }
        }
      }
    }
  }

  augment "/frr-interface:lib/frr-interface:interface" {
    uses ip-vrrp-top;
  }
}