//TODO mandatory statements
module lisp {
  yang-version 1;
  namespace "urn:opendaylight:params:xml:ns:yang:lisp";
  prefix "lisp";
  import ietf-interfaces {
    prefix "if";
  }
  import ietf-inet-types {
    prefix "inet";
  }
  import ietf-lisp-address-types {
    prefix "lisp-types";
  }
  organization
    "FD.io Overlay Forwarding Engine (ONE) project";
  contact
    "Florin Coras <fcoras@cisco.com>
     Vina Ermagan <vermagan@cisco.com>
     ONE list <one@lists.fd.io>";

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

  revision 2016-12-14 {
    description
     "This revision adds support for L2 features, by adding vrf-subtable/bridge-domain-subtable
     containers under vni-table. Both contains mandatory reference to index(vrf-subtable)
     or name(bridge-domain-subtable) of respective kind of table.";

    reference
      "https://tools.ietf.org/html/rfc6830";
  }

  revision "2016-05-20" {
    description
      "Initial revision of LISP model";
    reference
      "https://tools.ietf.org/html/rfc6830";
  }

  typedef locator-set-ref {
    type leafref {
      path "/lisp/lisp-feature-data/locator-sets/locator-set/name";
    }
    description "Locator-set reference";
  }

  typedef mapping-id {
    type string;
    description "Mapping ID";
  }

  typedef map-reply-action {
    type enumeration {
      enum no-action {
        value 0;
        description
          "Mapping is kept alive and no encapsulation occurs.";
      }
      enum natively-forward {
        value 1;
        description
          "Matching packets are not encapsulated or dropped but
           natively forwarded.";
      }
      enum send-map-request {
        value 2;
        description
          "Matching packets invoke Map-Requests.";
      }
      enum drop {
        value 3;
        description
          "Matching packets are dropped.";
      }
    }
    description
      "Defines the lisp map-cache ACT type";
    reference
      "https://tools.ietf.org/html/rfc6830#section-6.1.4";
  }
  grouping locator-properties-grouping {
    description
      "Properties of a RLOC";
    leaf priority {
      type uint8;
      description
        "Locator priority.";
    }
    leaf weight {
      type uint8;
      description
        "Locator weight.";
    }
  }

  grouping locator-sets-grouping {
    // NOTE: to be used only for local locators
    // lisp_add_del_locator_set locator-set <ls_name> [del]
    // lisp_add_del_locator locator-set <ls_name> iface <iface_name>
    //                                  p <val> w <val> [del]
    container locator-sets {
      list locator-set {
        key "name";
        leaf name {
          type string;
          description "Locator-set name";
        }
        list interface {
          key "interface-ref";
          leaf interface-ref {
            type if:interface-ref;
            description "Interface reference";
          }
          uses locator-properties-grouping;
          description "List of interfaces part of the locator-set";
        }
        description "Locator-set";
      }
      description "Locator-sets";
    }
    description "Grouping for locator-sets";
  }

  grouping adjacencies-grouping {
    container adjacencies {
      list adjacency {
        key "id";
        leaf id {
          type string;
          description "Adjacency id";
        }
        container local-eid {
          uses lisp-types:lisp-address;
          description "Local EID that must have a local mapping";
        }
        container remote-eid {
          uses lisp-types:lisp-address;
          description "Remote EID that must have a remote mapping";
        }
        description "List of adjacencies";
      }
      description "Adjacencies programmed into the data plane";
    }
    description "Adjacencies grouping";
  }

  grouping dp-subtable-grouping {
    // Once both vni and table-id are set:
    // lisp_eid_table_add_del_map <vni> <dp_table>
    container local-mappings {
      list local-mapping {
        key "id";
        leaf id {
          type mapping-id;
          description "Id that uniquely identifies a mapping";
        }
        container eid {
          uses lisp-types:lisp-address;
          description "EID address";
        }
        leaf locator-set {
          type locator-set-ref;
          description "Locator-set";
        }
        description "Local mapping";
      }
      description "Local EID to locator-set mappings";
    }
    // lisp_add_del_local_eid eid <ip-address/mask> locator-set
    //                            <ls-name> [del]
    // lisp_add_del_remote_mapping vni <vni> eid <eid> seid
    //                             <seid> [action <action>] rloc
    //                             <ip-addr> [rloc <ip-addr> ..]
    // NOTE: 1.lisp_add_del_remote_mapping seid is used to build
    //         src/dst mappings. Rlocs have p/w in them
    container remote-mappings {
      list remote-mapping {
        key "id";
        leaf id {
          type mapping-id;
          description "Id that uniquely identifies a mapping";
        }
        container eid {
            description "Remote EID address";
            uses lisp-types:lisp-address;
        }
        leaf ttl {
          type uint32;
          description "Mapping validity period.";
        }
        leaf authoritative {
          type bits {
            bit A {
              description "Authoritative bit.";
            }
          }
          description
            "Bit that indicates if mapping comes from an
             authoritative source.";
        }
        choice locator-list {
          description
            "list of locators are either negative, or positive.";
          case negative-mapping {
            //NOTE - Wrapped in container to prevent leaf map-reply-action enforcing impresence of rlocs
            container map-reply{
                leaf map-reply-action {
                  type map-reply-action;
                  description
                    "Forwarding action for a negative mapping.";
                }
            }
          }
          case positive-mapping {
            // NOTE if container is not needed to encapsulate
            // locator list, remove it
            container rlocs {
              list locator {
                 key "address";
                 leaf address {
                   type inet:ip-address;
                   description "Locator address";
                 }
                 uses locator-properties-grouping;
                 description "Remote locator";
              }
              description
                "List of locators for a positive mapping.";
            }
          }
        }
        uses adjacencies-grouping;
        description "List of remote mappings";
      }
      description "Map-cache/remote mappings cache";
    }
    description "Data path subtable (VRF/bridge domain) grouping";
  }

  grouping eid-table-grouping {
    container eid-table {
      list vni-table {
        key "virtual-network-identifier";
        leaf virtual-network-identifier {
            type uint32;
            description "vni";
        }
        container vrf-subtable {
          presence "Enable L3 mapping";
          leaf table-id {
             type uint32;
             description "table-id";
             mandatory true;
          }

          uses dp-subtable-grouping;
          description "VRF subtable";
        }
        container bridge-domain-subtable {
          presence "Enable L2 mapping";
          leaf bridge-domain-ref {
            type string;
            description "Name reference to existing bridge domain";
            mandatory true;
          }

          uses dp-subtable-grouping;
          description "Bridge domain subtable";
        }
        description "VNI tables";
      }
      description "EID table";
    }
    description "EID table grouping";
  }
  grouping map-resolvers-grouping {
    container map-resolvers {
      // lisp_add_del_map_resolver <ip>
      list map-resolver {
        key ip-address;
        leaf ip-address {
          type inet:ip-address;
          description "Map-resolver IP address";
        }
        description "List of map-resolvers";
      }
      description "Map-resolvers configured";
    }
    description "Map-Resolver grouping";
  }
  grouping pitr-cfg-grouping {
    // lisp_pitr_set_locator_set <ip>
    container pitr-cfg {
      leaf locator-set {
        type locator-set-ref;
        description "Locator-set reference";
      }
      description "Proxy-ITR configuration";
    }
    description "PITR configuration grouping";
  }

  grouping itr-remote-locator-sets-grouping{
    container itr-remote-locator-set{
    // lisp_add_del_map_request_itr_rlocs add/del <ls_name>
    // lisp_get_map_request_itr_rlocs
        leaf remote-locator-set-name{
            type locator-set-ref;
            description "Locators to be used in map-requests";
        }
    }
  }

  grouping lisp-feature-data-grouping{
    //aggregation of all lisp data, restricted by Lisp beeing enabled

    container lisp-feature-data{
        when "../lisp:enable = 'true'";

        uses locator-sets-grouping;
        uses eid-table-grouping;
        uses map-resolvers-grouping;
        uses pitr-cfg-grouping;
        uses itr-remote-locator-sets-grouping;
    }
  }

  // ref https://wiki.fd.io/view/ONE/Command-line_Interface_CLI_Guide
  container lisp {

    // lisp_enable_disable / lisp_enable_disable_status_dump
    leaf enable {
      type boolean;
      description "Enable/disable LISP feature";
    }
    uses lisp-feature-data-grouping;
    description "LISP configuration";
  }

  container lisp-state {

    // lisp_enable_disable / lisp_enable_disable_status_dump
    leaf enable {
      type boolean;
      description "Enable/disable LISP feature";
    }
    uses lisp-feature-data-grouping;
    description "LISP state";
  }
}