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module vpp-vlan {
  yang-version 1;
  namespace "http://fd.io/hc2vpp/yang/vpp-vlan";
  prefix "vpp-vlan";

  import ietf-interfaces {
    prefix "if";
  }
  import ietf-inet-types {
    prefix inet;
  }
  import ietf-yang-types {
    prefix "yang";
  }
  import yang-ext {
    prefix "ext";
  }
  import dot1q-types {
    prefix dot1q;
  }
  import v3po {
    prefix v3po;
  }

  organization
    "FD.io - The Fast Data Project";

  contact
    "Hc2vpp Wiki <https://wiki.fd.io/view/Hc2vpp>
     Mailing List <hc2vpp@lists.fd.io>";

  description
    "This module contains a collection of YANG definitions
     for managing VPP VLANs.

     Copyright (c) 2016-2018 Cisco and/or its affiliates.

     Licensed under the Apache License, Version 2.0 (the 'License');
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at:

     http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an 'AS IS' BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.";

  revision "2019-05-27" {
    description
      "Removed interfaces-state augmentations due to its deprecation
       in ietf-interfaces model";
  }

  revision "2018-03-19" {
    description "Prefix invalid 802dot1q and 802dot1ad identifiers with underscore.";
  }

  revision "2017-06-07" {
    description "Eliminated config leafrefs in operational tree";
  }

  revision "2017-05-09" {
    description "Revision changes:
        - add support for ipv4/6 vrf id for sub interfaces";
  }

  revision "2017-03-15" {
    description
      "Revision changes:
       - acl and ietf-acl moved to vpp-subinterface-acl";
  }

  revision "2016-12-14" {
    description
      "This revision adds the following new features:
       - ingress/egress ACLs support";
  }

  revision "2016-05-27" {
    description
    "Initial revision of vlan model for VPP.
     Reuses some concepts from draft-wilton-netmod-intf-vlan-yang-02 model.";
  }

  typedef sub-interface-status {
    type enumeration {
      enum "up";
      enum "down";
    }
  }

  // todo add 802dot1ad support to dot1q-types.yang
  /*
   * Defines the supported IEEE 802.1Q types that can be used for
   * VLAN tag matching.
   */
  identity vlan-type {
    description "Base identity from which all VLAN types
                 are derived from";
  }

  identity _802dot1q {
    base vlan-type;
    description
      "An 802.1Q VLAN type";
  }

  identity _802dot1ad {
    base vlan-type;
    description
      "An 802.1ad VLAN type";
  }

  typedef vlan-type {
    type identityref {
      base "vlan-type";
    }
    description "Identifies a specific VLAN type";
  }

  grouping match-attributes {
    choice match-type {
      mandatory true;
      description "Provides a choice of how the frames may be matched";

      case default {
        description "Default match";
        leaf default {
          type empty;
          description
            "Default match.  Matches all traffic not matched to any
             other peer sub-interface by a more specific
             encapsulation.";
        } // leaf default
      } // case default

      case untagged {
        description "Match untagged Ethernet frames only";
        leaf untagged {
          type empty;
            description
              "Untagged match.  Matches all untagged traffic.";
        } // leaf untagged
      } // case untagged

      case vlan-tagged {
        container vlan-tagged {
          description "Matches VLAN tagged frames. Vlan tags need to be specified to use this match type";

          leaf match-exact-tags {
            type boolean;
            default true;
            description
              "If set, indicates that all 802.1Q VLAN tags in the
               Ethernet frame header must be explicitly matched, i.e.
               the EtherType following the matched tags must not be a
               802.1Q tag EtherType.  If unset then extra 802.1Q VLAN
               tags are allowed.";
          }
        } // container vlan-tagged
      } // case vlan-tagged
    }
  }

  // TODO VPP does not allow to change subinterface nor delete it (except for tag-rewrite operation)
  grouping sub-interface-base-attributes {
    leaf vlan-type {
      type vlan-type;
      default _802dot1q;
    }

    container tags {
      list tag {
        key "index";
        max-elements 2;

        description "The VLAN tags to use by locally sourced traffic";

        leaf index {
          type uint8 {
            range "0..1";
          }

          /*
           * Only allow a push of an inner tag if an outer tag is also
           * being pushed.
           */
          must "index != 0 or
                count(../../push-tags[index = 0]/index) > 0" {
            error-message "An inner tag can only be pushed if an outer
                           tag is also specified";
            description "Only allow a push of an inner tag if an outer
                         tag is also being pushed";
          }
          description "The index into the tag stack";
        }

        uses dot1q:dot1q-tag-or-any;

      }
    }

    container match {
      description
       "The match used to classify frames to this interface";
      uses match-attributes;
    }
  }

  grouping rewrite-attributes {
    container rewrite {
        uses tag-rewrite;
    }
  }

  grouping sub-interface-l2-config-attributes {
    container l2 {
      uses v3po:l2-config-attributes;
      uses rewrite-attributes;
    }
  }

  grouping sub-interface-config-attributes {
    leaf enabled {
      type boolean;
      default "false";
      description
        "Contains the configured, desired state of the sub-interface.
        To enable sub-interface, the super inerface needs to be enabled";
    }

    leaf admin-status {
      type sub-interface-status;
      mandatory true;
      config false;
    }

    leaf oper-status {
      type sub-interface-status;
      mandatory true;
      config false;
    }

    leaf if-index {
      type int32 {
        range "1..2147483647";
      }
      mandatory true;
      config false;
    }

    leaf phys-address {
      type yang:phys-address;
      description
        "The sub-interface's Media Access Control (MAC) address.";
      config false;
    }

    leaf speed {
      type yang:gauge64;
      units "bits/second";
      config false;
    }
  }

  /*
   * Only symetrical rewrite is supported
   */
  grouping tag-rewrite {
    description "Flexible rewrite";

    leaf vlan-type { // todo rename to push_dot1q, mandatory(?) with default true
      type vlan-type;
      default _802dot1q;
    }

    leaf pop-tags {
      type uint8 {
        range 1..2;
      }
      description "The number of tags to pop (or translate if used in
                   conjunction with push-tags)";
    }

    list push-tags {
      key "index";
      max-elements 2;
      description "The number of tags to push (or translate if used
                   in conjunction with pop-tags)";
      /*
       * Server should order by increasing index.
       */
      leaf index {
        type uint8 {
          range 0..1;
        }

        /*
         * Only allow a push of an inner tag if an outer tag is also
         * being pushed.
         */
        must "index != 0 or
              count(../../push-tags[index = 0]/index) > 0" {
          error-message "An inner tag can only be pushed if an outer
                         tag is also specified";
          description "Only allow a push of an inner tag if an outer
                       tag is also being pushed";
        }
      }

      uses dot1q:dot1q-tag;
    }
  }

  grouping sub-interface-ip4-attributes {
    container ipv4 {
      // TODO: add currently unsupported:
      // enabled, forwarding, mtu, address/origin(config false), neighbor/origin(config false)

      // TODO: reuse groupings once ietf-ip provides them

      description
        "Parameters for the IPv4 address family (based on ietf-ip rev. 2014-06-16)";

      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.";
        }

        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 {
            type yang:dotted-quad;
            description
              "The subnet specified as a netmask (contiguous)";
          }
        }  // choice subnet
      }  // list address

      list neighbor {
        key "ip";
        description
          "A list of mappings from IPv4 addresses to
          link-layer addresses.

          Entries in this list are used as static entries in the
          ARP Cache.";
        reference
          "RFC 826: An Ethernet Address Resolution Protocol";

        leaf ip {
          type inet:ipv4-address-no-zone;
          description
            "The IPv4 address of the neighbor node.";
        }

        leaf link-layer-address {
          type yang:phys-address;
          mandatory true;
          description
            "The link-layer address of the neighbor node.";
        }
      }  // list neighbor
    }
  }

  grouping sub-interface-ip6-attributes {
    container ipv6 {
      // TODO: add currently unsupported:
      // enabled, forwarding, mtu, neighbor, dup-addr-detect-transmits, autoconf,
      // address(config false): origin, status
      // neighbor(config false): origin, is-router, state

      // TODO: reuse groupings once ietf-ip provides them

      description
        "Parameters for the IPv6 address family (based on ietf-ip rev. 2014-06-16)";

      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

      list neighbor {
        key "ip";
        description
          "A list of mappings from IPv6 addresses to
        link-layer addresses.

        Entries in this list are used as static entries in the
        Neighbor Cache.";
        reference
          "RFC 4861: Neighbor Discovery for IP version 6 (IPv6)";

        leaf ip {
          type inet:ipv6-address-no-zone;
          description
            "The IPv6 address of the neighbor node.";
        }

        leaf link-layer-address {
          type yang:phys-address;
          mandatory true;
          description
            "The link-layer address of the neighbor node.";
        }
      }  // list neighbor
    }
  }

  grouping sub-interface-routing-attributes {
    description "Provides basic attributes for ipv4/6 vrf configuration";
    container routing {
      uses v3po:routing-base-attributes;
    }
  }

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

    container sub-interfaces {
      description "L2 vlan subinterfaces";


      list sub-interface {
        key "identifier";
        leaf identifier {
          type uint32;
        }

        uses sub-interface-base-attributes;
        uses sub-interface-config-attributes;
        uses sub-interface-ip4-attributes;
        uses sub-interface-ip6-attributes;
        uses sub-interface-routing-attributes;
        uses sub-interface-l2-config-attributes;
      }
    }
  }
}