module dhcp {

    yang-version 1;
    namespace "urn:opendaylight:params:xml:ns:yang:vpp:dhcp";
    prefix "dhcp";

    description
        "This YANG module defines the generic configuration and
        operational data for dhcp in VPP";

    revision "2017-03-15" {
        description
            "Initial revision of dhcp model";
    }

    import ietf-inet-types {
        prefix inet;
    }

    identity address-family {
        description
            "Base identity from which identities describing address
            families are derived.";
    }

    identity ipv4 {
        base address-family;
        description
            "This identity represents IPv4 address family.";
    }

    identity ipv6 {
        base address-family;
        description
            "This identity represents IPv6 address family.";
    }

    typedef address-type {
        type identityref {
            base address-family;
        }
    }

    grouping relay-attributes {
        list server {
          key "vrf-id address";
          leaf address {
            // FIXME(HC2VPP-79): change to ip-address-no-zone after https://bugs.opendaylight.org/show_bug.cgi?id=6413 is resolved
            type inet:ip-address;
            description
              "IP address of the server DHCP packets will be forwarded to.";
          }
          leaf vrf-id {
            type uint32;
            description
              "Used to send DHCP messages to the server";
          }
        }

        leaf gateway-address {
          // FIXME(HC2VPP-79): change to ip-address-no-zone after https://bugs.opendaylight.org/show_bug.cgi?id=6413 is resolved
          type inet:ip-address;
            mandatory true;
            description
                "IP address of the relay agent.";
        }
        // TODO(HC2VPP-44): add configurable circut-id (option-82/remote-id)
    }

    grouping dhcp-attributes {
        container relays {
            list relay {
                key "address-type rx-vrf-id";
                leaf address-type {
                    type address-type;
                }
                leaf rx-vrf-id {
                    type uint32;
                    description
                        "Used to receive DHCP messages from clients.";
                }
                uses relay-attributes;
            }
        }
    }

    container dhcp {
        uses dhcp-attributes;
    }
}