module v3po {
  yang-version 1;
  namespace "urn:opendaylight:params:xml:ns:yang:v3po";
  prefix "v3po";

  revision "2015-01-05" {
    description "Initial revision of v3po model";
  }

  import iana-if-type {
    prefix "ianaift";
  }
  import ietf-interfaces {
    prefix "if";
  }
  import ietf-yang-types {
    prefix "yang";
  }
  import ietf-inet-types {
    prefix "inet";
  }
  import ietf-ip {
    prefix "ip";
  }
  import yang-ext {
    prefix "ext";
  }
  import vpp-classifier {
    prefix "vpp-classifier";
  }

  typedef bridge-domain-ref {
    type leafref {
      path "/vpp/bridge-domains/bridge-domain/name";
    }
    description
      "This type is used by to reference a bridge domain table";
  }

  typedef bridged-virtual-interface-ref {
    type leafref {
      path "/if:interfaces/if:interface/l2/bridged-virtual-interface";
    }
    description
      "This type is used by to reference a bridged virtual interface";
  }

  identity vxlan-tunnel {
    base if:interface-type;
  }

  identity vhost-user {
    base if:interface-type;
  }

  identity tap {
    base if:interface-type;
  }

  identity l2-fib-action {
    description "Base identity for l2-fib actions";
  }

  identity l2-fib-forward {
    base l2-fib-action;
    description
      "Forwards packet with configured mac address";
  }

  identity l2-fib-filter {
    base l2-fib-action;
    description
      "Drops packet with configured mac address";
  }

  typedef l2-fib-action {
    type identityref {
      base "l2-fib-action";
    }
    description "Identifies a specific L2 FIB action";
  }

  typedef vxlan-vni {
    // FIXME: should be in a vxlan-specific model
    description "VNI used in a VXLAN tunnel";
    type uint32 {
      range "0..16777215";
    }
  }

  typedef vhost-user-role {
    type enumeration {
      enum "server";
      enum "client";
    }
  }

  identity vxlan-gpe-tunnel {
    base if:interface-type;
  }

  typedef vxlan-gpe-vni {
    description "VNI used in a VXLAN-GPE tunnel";
    type uint32 {
      range "0..16777215";
    }
  }

  typedef vxlan-gpe-next-protocol {
    type enumeration {
      enum "ipv4" {
        value 1;
      }
      enum "ipv6" {
        value 2;
      }
      enum "ethernet" {
        value 3;
      }
      enum "nsh" {
        value 4;
      }
    }
  }

  grouping bridge-domain-attributes {
    leaf flood {
      type boolean;
      default true;
      description
      "Enable/disable L2 flooding.";
    }
    leaf forward {
      type boolean;
      default true;
      description
      "Enable/disable L2 forwarding.";
    }
    leaf learn {
      type boolean;
      default true;
      description
      "Enable/disable L2 learning.";
    }
    leaf unknown-unicast-flood {
      type boolean;
      default true;
    }
    leaf arp-termination {
      type boolean;
      default false;
    }
  }

  // TODO express constraints for L2 FIB entries in YANG if possible
  grouping l2-fib-attributes {
    container l2-fib-table {
      list l2-fib-entry {
        key "phys-address";

        leaf phys-address {
          type yang:phys-address;
        }

        leaf outgoing-interface {
          type string;
          // mandatory true;
          // mandatory for forward action
          // FIXME VPP's CLI does not require to set iface id for filter action
          // VPP's binary api in constrast to CLI does some checks on the iface id value,
          // so currently it has to be set for all actions
          description
            "One of interfaces assigned to the FIB table's bridge-domain.";
        }
        leaf static-config {
          type boolean;
          default false;
          description
            "Static entries cannot be overridden by mac learning.";
        }
        leaf action {
          type l2-fib-action;
          mandatory true;
          description
            "L2 FIB action. For filter action, entry must be configured as static.";
        }
        leaf bridged-virtual-interface {
          when "../v3po:action = 'forward'";
          type boolean;
          config false; // FIXME setting bvi is currently not supported by VPP's binary api
        }
      }
    }
  }

  grouping tap-interface-base-attributes {
    leaf tap-name {
      type string;
    }
  }

  grouping tap-interface-config-attributes {
    leaf mac {
      type yang:phys-address;
      mandatory false;
      description "Mac address to be set for the tap interface. Random will be used if not configured";
    }

    leaf device-instance {
      type uint32;
      mandatory false;
      description "Custom device instance. Autogenerated will be used if not configured";
    }
  }

  grouping ethernet-base-attributes {
    leaf mtu {
      type uint16 {
        range "64..9216";
      }
      units "octets";
      default 9216;
      description
      "The size, in octets, of the largest packet that the
       hardware interface will send and receive.";
    }
  }

  grouping ethernet-state-attributes {
    leaf manufacturer-description {
      type string;
      config false;
    }
    leaf duplex {
      type enumeration {
        enum "half";
        enum "full";
      }
      config false;
    }
  }

  grouping vhost-user-interface-base-attributes {
    leaf socket {
      type string {
        length 1..255;
      }
    }
    leaf role {
      type vhost-user-role;
      default "server";
    }
    description "vhost-user settings";
  }

  grouping vhost-user-interface-state-attributes {
    leaf features {
      type uint64;
      config false;
    }
    leaf virtio-net-hdr-size {
      type uint32;
      config false;
    }
    leaf num-memory-regions {
      type uint32;
      config false;
    }
    leaf connect-error {
      type string;
      config false;
    }
  }

  grouping vxlan-base-attributes {
    // FIXME: this should be in an vxlan-specific extension
    leaf src {
      /*mandatory true;*/
      type inet:ip-address;
    }
    leaf dst {
      /*mandatory true;*/
      type inet:ip-address;
    }
    leaf vni {
      /*mandatory true;*/
      type vxlan-vni;
    }
    leaf encap-vrf-id {
      type uint32;
    }
  }

  grouping vxlan-gpe-base-attributes {
    leaf local {
      /*mandatory true;*/
      type inet:ip-address;
    }
    leaf remote {
      /*mandatory true;*/
      type inet:ip-address;
    }
    leaf vni {
      /*mandatory true;*/
      type vxlan-gpe-vni;
    }
    leaf next-protocol {
      type vxlan-gpe-next-protocol;
    }
    leaf encap-vrf-id {
      type uint32;
    }
    leaf decap-vrf-id {
      type uint32;
    }
  }

  grouping l2-base-attributes {
      description
      "Parameters for configuring Layer2 features on interfaces.";

      choice interconnection {
        case xconnect-based {
          leaf xconnect-outgoing-interface {
            /* Don't allow selection of this interface */
            must "../../if:name != current()";
            type if:interface-ref; // todo use interface-state-ref for operational data?
            description
              "L2 xconnect mode";
          }
        }
        case bridge-based {
          leaf bridge-domain {
            type bridge-domain-ref;
            mandatory true;
            description
              "Interfaces in a bridge-domain forward packets to other
               interfaces in the same bridge-domain based on
               destination mac address.";
          }
          leaf split-horizon-group {
            when "../bridge-domain";
            type uint8 {
              range "1..255";
            }
            description
              "Interface's split-horizon group. Interfaces in the same
               bridge-domain and split-horizon group can not forward
               packets between each other. ";
          }
          leaf bridged-virtual-interface {
            when "../bridge-domain";
            type boolean;
            default false;
            description
              "Interface forward packets in the bridge-domain
               associated with the BVI.";
          }
        }
      }
  }

  grouping acl-base-attributes {
    description
      "Defines references to classify tables.
       At least one table reference should be specified.";
    container l2-acl {
      leaf classify-table {
        type vpp-classifier:classify-table-ref;
        description
          "An L2 ACL table";
      }
    }
    container ip4-acl {
      leaf classify-table {
        type vpp-classifier:classify-table-ref;
        description
          "An IPv4 ACL table";
      }
    }
    container ip6-acl {
      leaf classify-table {
        type vpp-classifier:classify-table-ref;
        description
          "An IPv6 ACL table";
      }
    }
  }

  augment /if:interfaces/if:interface {
    ext:augment-identifier "vpp-interface-augmentation";

    // FIXME using ietf-interfaces model for vpp interfaces makes it hard to implement because:
    // 1. The link between interface type and this augmentation is unclear
    // 2. Only this augmentation with combination of ifc type is trigger to do something for vpp, what if user only configures base interface stuff ? + We need to get leaves defined by ietf-interfaces when we are processing this augment
    // 3. The ietf-interfaces model does not define groupings which makes types reuse difficult

    container tap {
      when "../if:type = 'v3po:tap'";
      uses tap-interface-base-attributes;
      uses tap-interface-config-attributes;
    }

    container ethernet {
      when "../if:type = 'ianaift:ethernetCsmacd'";
      uses ethernet-base-attributes;
    }

    container routing {
      leaf vrf-id { // todo no routing info for oper, is it possible to get it from the vpp?
        type uint32;
        default 0;
      }
    }

    container vhost-user {
      when "../if:type = 'v3po:vhost-user'";
      uses vhost-user-interface-base-attributes;
    }

    container vxlan {
      when "../if:type = 'v3po:vxlan-tunnel'";
      uses vxlan-base-attributes;
    }

    container l2 {
      must "(not (../if:ipv4[if:enabled = 'true']/if:address/if:ip) and " +
      "not (../if:ipv6[if:enabled = 'true']/if:address/if:ip))";

      uses l2-base-attributes;
    }

    container vxlan-gpe {
      when "../if:type = 'v3po:vxlan-gpe-tunnel'";

      uses vxlan-gpe-base-attributes;
    }

    container acl {
      uses acl-base-attributes;
    }
  }

  container vpp {
    description
    "VPP config data";

    container bridge-domains {
      list bridge-domain {
        key "name";

        leaf name {
          type string;
        }

        uses bridge-domain-attributes;
        uses l2-fib-attributes;

        description
          "bridge-domain configuration";
      }
    }
  }

  augment /if:interfaces-state/if:interface {
    ext:augment-identifier "vpp-interface-state-augmentation";

    leaf description {
      type string;
    }

    container tap {
      when "../if:type = 'v3po:tap'";
      uses tap-interface-base-attributes;
    }

    container ethernet {
      when "../if:type = 'ianaift:ethernetCsmacd'";
      uses ethernet-base-attributes;
      uses ethernet-state-attributes;
    }

    container vhost-user {
      when "../if:type = 'v3po:vhost-user'";
      uses vhost-user-interface-base-attributes;
      uses vhost-user-interface-state-attributes;
    }

    container vxlan {
      when "../if:type = 'v3po:vxlan-tunnel'";
      uses vxlan-base-attributes;
    }
    container vxlan-gpe {
      when "../if:type = 'v3po:vxlan-gpe-tunnel'";

      uses vxlan-gpe-base-attributes;
    }

    container l2 {
      must "(not (../if:ipv4[if:enabled = 'true']/if:address/if:ip) and " +
      "not (../if:ipv6[if:enabled = 'true']/if:address/if:ip))";

      uses l2-base-attributes;
    }

    container acl {
      uses acl-base-attributes;
    }
  }

  augment /if:interfaces-state/if:interface/if:statistics {
    ext:augment-identifier "vpp-interface-statistics-augmentation";
    leaf in-errors-no-buf {
      type yang:counter64;
    }
    leaf in-errors-miss {
      type yang:counter64;
    }
    leaf out-discards-fifo-full {
      type yang:counter64;
    }
  }

  container vpp-state {
    config false;

    description
      "VPP operational data";

    container bridge-domains {
      // FIXME: Should this live in bridge-domain.yang in a modular fashion ?
      list bridge-domain {

        key "name";
        leaf name {
          type string;
        }

        uses bridge-domain-attributes;
        uses l2-fib-attributes;

        description
          "bridge-domain operational data";
      }
    }

    container version {
      leaf name {
        type string;
      }
      leaf build-directory {
        type string;
      }
      leaf build-date {
        type string;
      }
      leaf branch {
        type string;
      }
      description
      "vlib version info";
    }
  }

  // VPP Notifications

  typedef interface-status {
    type enumeration {
      enum up {
        value 1;
      }
      enum down {
        value 0;
      }
    }
  }

  typedef interface-name-or-index {
    type union {
      type string;
      type uint32;
    }
  }

  notification interface-state-change {
    leaf name {
        type interface-name-or-index;
    }

    leaf admin-status {
        type interface-status;
    }

    leaf oper-status {
        type interface-status;
    }
  }

  notification interface-deleted {
    leaf name {
        type interface-name-or-index;
    }
  }
}