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

  import ietf-inet-types {
    prefix inet;
  }
  import ietf-yang-types {
    prefix yang;
  }

  organization "FRRouting";
  contact
    "FRR Users List:       <mailto:frog@lists.frrouting.org>
     FRR Development List: <mailto:dev@lists.frrouting.org>";
  description
    "This module defines filter settings

     Copyright 2020 FRRouting

     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions
     are met:

     1. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

     2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.

     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.";

  revision 2019-07-04 {
    description "Initial revision";
  }

  /*
   * Types.
   */
  typedef access-list-name {
    description "Access list name formatting";
    type string {
      length 1..128;
    }
  }

  typedef access-list-sequence {
    description "Access list sequence number";
    type uint32 {
      range "1..4294967295";
    }
  }

  typedef access-list-action {
    description "Access list return action on match";
    type enumeration {
      enum deny {
        description "Deny an entry";
        value 0;
      }
      enum permit {
        description "Accept an entry";
        value 1;
      }
    }
  }

  /*
   * Configuration data.
   */
  container lib {
    list access-list {
      description "Access list instance";

      key "type name";

      leaf type {
        description "Access list content type";
        type enumeration {
          enum ipv4 {
            description "Internet Protocol address version 4";
            value 0;
          }
          enum ipv6 {
            description "Internet Protocol address version 6";
            value 1;
          }
          enum mac {
            description "Media Access Control address";
            value 2;
          }
        }
      }

      leaf name {
        description "Access list name";
        type access-list-name;
      }

      leaf remark {
        description "Access list remark";
        type string;
      }

      list entry {
        description "Access list entry";

        key "sequence";

        leaf sequence {
          description "Access list sequence value";
          type access-list-sequence;
        }

        leaf action {
          description "Access list action on match";
          type access-list-action;
          mandatory true;
        }

        choice value {
          description "Access list value to match";
          mandatory true;

          case ipv4-prefix {
            when "../type = 'ipv4'";

            choice style {
              description "Access list entry style selection: zebra or cisco.";
              mandatory true;

              case zebra {
                leaf ipv4-prefix {
                  description "Configure IPv4 prefix to match";
                  type inet:ipv4-prefix;
                }

                leaf ipv4-exact-match {
                  description "Exact match of prefix";
                  type boolean;
                  default false;
                }
              }
              case cisco {
                choice standard-value {
                  description "Source value to match";

                  leaf host {
                    description "Host to match";
                    type inet:ipv4-address;
                  }
                  container network {
                    leaf address {
                      mandatory true;
                      description "Network address part.";
                      type inet:ipv4-address;
                    }
                    leaf mask {
                      mandatory true;
                      description "Network mask/wildcard part.";
                      type inet:ipv4-address;
                    }
                  }
                  leaf source-any {
                    /*
                     * Was `any`, however it conflicts with `any` leaf
                     * outside this choice.
                     */
                    description "Match any";
                    type empty;
                  }
                }

                choice extended-value {
                  description "Destination value to match";

                  leaf destination-host {
                    description "Host to match";
                    type inet:ipv4-address;
                  }
                  container destination-network {
                    leaf address {
                      mandatory true;
                      description "Network address part.";
                      type inet:ipv4-address;
                    }
                    leaf mask {
                      mandatory true;
                      description "Network mask/wildcard part.";
                      type inet:ipv4-address;
                    }
                  }
                  leaf destination-any {
                    description "Match any";
                    type empty;
                  }
                }
              }
            }
          }
          case ipv6-prefix {
            when "../type = 'ipv6'";

            leaf ipv6-prefix {
              description "Configure IPv6 prefix to match";
              type inet:ipv6-prefix;
            }

            leaf ipv6-exact-match {
              description "Exact match of prefix";
              type boolean;
              default false;
            }
          }
          case mac {
            when "../type = 'mac'";

            leaf mac {
              description "Configure MAC address to match";
              type yang:mac-address;
            }
          }
          case any {
            leaf any {
              description "Match anything";
              type empty;
            }
          }
        }
      }
    }

    list prefix-list {
      description "Prefix list instance";

      key "type name";

      leaf type {
        description "Prefix list type";
        type enumeration {
          enum ipv4 {
            description "Internet Protocol address version 4";
            value 0;
          }
          enum ipv6 {
            description "Internet Protocol address version 6";
            value 1;
          }
        }
      }

      leaf name {
        description "Prefix list name";
        type access-list-name;
      }

      leaf remark {
        description "Prefix list user description";
        type string;
      }

      list entry {
        description "Prefix list entry";

        key "sequence";

        leaf sequence {
          description "Access list sequence value";
          type access-list-sequence;
        }

        leaf action {
          description "Prefix list action on match";
          type access-list-action;
          mandatory true;
        }

        choice value {
          description "Prefix list value to match";
          mandatory true;

          case ipv4-prefix {
            leaf ipv4-prefix {
              description "Configure IPv4 prefix to match";
              type inet:ipv4-prefix;
            }

            leaf ipv4-prefix-length-greater-or-equal {
              description
                "Specifies if matching prefixes with length greater than
                 or equal to value";
              type uint8 {
                range "0..32";
              }
            }

            leaf ipv4-prefix-length-lesser-or-equal {
              description
                "Specifies if matching prefixes with length lesser than
                 or equal to value";
              type uint8 {
                range "0..32";
              }
            }
          }
          case ipv6-prefix {
            leaf ipv6-prefix {
              description "Configure IPv6 prefix to match";
              type inet:ipv6-prefix;
            }

            leaf ipv6-prefix-length-greater-or-equal {
              description
                "Specifies if matching prefixes with length greater than
                 or equal to value";
              type uint8 {
                range "0..128";
              }
            }

            leaf ipv6-prefix-length-lesser-or-equal {
              description
                "Specifies if matching prefixes with length lesser than
                 or equal to value";
              type uint8 {
                range "0..128";
              }
            }
          }
          case any {
            leaf any {
              description "Match anything";
              type empty;
            }
          }
        }
      }
    }
  }
}