module openconfig-inet-types {

  yang-version "1";
  namespace "http://openconfig.net/yang/types/inet";
  prefix "oc-inet";

  import openconfig-extensions { prefix "oc-ext"; }

  organization
    "OpenConfig working group";

  contact
    "OpenConfig working group
    www.openconfig.net";

  description
    "This module contains a set of Internet address related
    types for use in OpenConfig modules.

    Portions of this code were derived from IETF RFC 6021.
    Please reproduce this note if possible.

    IETF code is subject to the following copyright and license:
    Copyright (c) IETF Trust and the persons identified as authors of
    the code.
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, is permitted pursuant to, and subject to the license
    terms contained in, the Simplified BSD License set forth in
    Section 4.c of the IETF Trust's Legal Provisions Relating
    to IETF Documents (http://trustee.ietf.org/license-info).";

  oc-ext:openconfig-version "0.3.1";

  revision 2017-08-24 {
    description
      "Minor formatting fixes.";
    reference "0.3.1";
  }

  revision 2017-07-06 {
    description
      "Add domain-name and host typedefs";
    reference "0.3.0";
  }

  revision 2017-04-03 {
    description
      "Add ip-version typedef.";
    reference "0.2.0";
  }

  revision 2017-04-03 {
    description
      "Update copyright notice.";
    reference "0.1.1";
  }

  revision 2017-01-26 {
    description
      "Initial module for inet types";
    reference "0.1.0";
  }

  // IPv4 and IPv6 types.

  typedef ipv4-address {
    type string {
      pattern '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|'        +
              '25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4]'  +
              '[0-9]|25[0-5])';
    }
    description
      "An IPv4 address in dotted quad notation using the default
      zone.";
  }

  typedef ipv4-address-zoned {
    type string {
      pattern '^(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|'        +
              '25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4]'  +
              '[0-9]|25[0-5])(%[a-zA-Z0-9_]+)$';
    }
    description
      "An IPv4 address in dotted quad notation.  This type allows
      specification of a zone index to disambiguate identical
      address values.  For link-local addresses, the index is
      typically the interface index or interface name.";
  }

  typedef ipv6-address {
    type string {
        pattern
          // Must support compression through different lengths
          // therefore this regexp is complex.
          '^(([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}|'         +
          '([0-9a-fA-F]{1,4}:){1,7}:|'                        +
          '([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|'        +
          '([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|' +
          '([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|' +
          '([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|' +
          '([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|' +
          '[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|'      +
          ':((:[0-9a-fA-F]{1,4}){1,7}|:)'                     +
          ')$';
    }
    description
      "An IPv6 address represented as either a full address; shortened
      or mixed-shortened formats, using the default zone.";
  }

  typedef ipv6-address-zoned {
    type string {
        pattern
          // Must support compression through different lengths
          // therefore this regexp is complex.
          '^(([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}|'         +
          '([0-9a-fA-F]{1,4}:){1,7}:|'                        +
          '([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|'        +
          '([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|' +
          '([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|' +
          '([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|' +
          '([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|' +
          '[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|'      +
          ':((:[0-9a-fA-F]{1,4}){1,7}|:)'                     +
          ')(%[a-zA-Z0-9_]+)$';
    }
    description
      "An IPv6 address represented as either a full address; shortened
      or mixed-shortened formats.  This type allows specification of
      a zone index to disambiguate identical address values.  For
      link-local addresses, the index is typically the interface
      index or interface name.";
  }

  typedef ipv4-prefix {
    type string {
      pattern '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|'       +
              '25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4]' +
              '[0-9]|25[0-5])/(([0-9])|([1-2][0-9])|(3[0-2]))';
    }
    description
      "An IPv4 prefix represented in dotted quad notation followed by
      a slash and a CIDR mask (0 <= mask <= 32).";
  }

  typedef ipv6-prefix {
    type string {
        pattern
          '^(([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}|'         +
          '([0-9a-fA-F]{1,4}:){1,7}:|'                        +
          '([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}'         +
          '([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|' +
          '([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|' +
          '([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|' +
          '([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|' +
          '[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|'      +
          ':((:[0-9a-fA-F]{1,4}){1,7}|:)'                     +
          ')/(12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9])$';
    }
    description
      "An IPv6 prefix represented in full, shortened, or mixed
      shortened format followed by a slash and CIDR mask
      (0 <= mask <= 128).";
  }

  typedef ip-address {
    type union {
      type ipv4-address;
      type ipv6-address;
    }
    description
      "An IPv4 or IPv6 address with no prefix specified.";
  }

  typedef ip-prefix {
    type union {
      type ipv4-prefix;
      type ipv6-prefix;
    }
    description
      "An IPv4 or IPv6 prefix.";
  }

  typedef ip-version {
    type enumeration {
      enum UNKNOWN {
        value 0;
        description
         "An unknown or unspecified version of the Internet
          protocol.";
      }
      enum IPV4 {
        value 4;
        description
         "The IPv4 protocol as defined in RFC 791.";
      }
      enum IPV6 {
        value 6;
        description
         "The IPv6 protocol as defined in RFC 2460.";
      }
    }
    description
     "This value represents the version of the IP protocol.
      Note that integer representation of the enumerated values
      are not specified, and are not required to follow the
      InetVersion textual convention in SMIv2.";
    reference
     "RFC  791: Internet Protocol
      RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
      RFC 4001: Textual Conventions for Internet Network Addresses";
  }

  typedef domain-name {
    type string {
      length "1..253";
      pattern
        '((([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.)*' +
        '([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.?)'   +
        '|\.';
    }
    description
      "The domain-name type represents a DNS domain name.
      Fully quallified left to the models which utilize this type.

      Internet domain names are only loosely specified.  Section
      3.5 of RFC 1034 recommends a syntax (modified in Section
      2.1 of RFC 1123).  The pattern above is intended to allow
      for current practice in domain name use, and some possible
      future expansion.  It is designed to hold various types of
      domain names, including names used for A or AAAA records
      (host names) and other records, such as SRV records.  Note
      that Internet host names have a stricter syntax (described
      in RFC 952) than the DNS recommendations in RFCs 1034 and
      1123, and that systems that want to store host names in
      schema nodes using the domain-name type are recommended to
      adhere to this stricter standard to ensure interoperability.

      The encoding of DNS names in the DNS protocol is limited
      to 255 characters.  Since the encoding consists of labels
      prefixed by a length bytes and there is a trailing NULL
      byte, only 253 characters can appear in the textual dotted
      notation.

      Domain-name values use the US-ASCII encoding.  Their canonical
      format uses lowercase US-ASCII characters.  Internationalized
      domain names MUST be encoded in punycode as described in RFC
      3492";
  }

  typedef host {
    type union {
      type ip-address;
      type domain-name;
    }
    description
      "The host type represents either an unzoned IP address or a DNS
      domain name.";
  }

  typedef as-number {
    type uint32;
    description
      "A numeric identifier for an autonomous system (AS). An AS is a
      single domain, under common administrative control, which forms
      a unit of routing policy. Autonomous systems can be assigned a
      2-byte identifier, or a 4-byte identifier which may have public
      or private scope. Private ASNs are assigned from dedicated
      ranges. Public ASNs are assigned from ranges allocated by IANA
      to the regional internet registries (RIRs).";
    reference
      "RFC 1930 Guidelines for creation, selection, and registration
                of an Autonomous System (AS)
       RFC 4271 A Border Gateway Protocol 4 (BGP-4)";
  }

  typedef dscp {
    type uint8 {
      range "0..63";
    }
    description
      "A differentiated services code point (DSCP) marking within the
      IP header.";
    reference
      "RFC 2474 Definition of the Differentiated Services Field
                 (DS Field) in the IPv4 and IPv6 Headers";
  }

  typedef ipv6-flow-label {
    type uint32 {
      range "0..1048575";
    }
    description
      "The IPv6 flow-label is a 20-bit value within the IPv6 header
      which is optionally used by the source of the IPv6 packet to
      label sets of packets for which special handling may be
      required.";
    reference
      "RFC 2460 Internet Protocol, Version 6 (IPv6) Specification";
  }

  typedef port-number {
    type uint16;
    description
      "A 16-bit port number used by a transport protocol such as TCP
      or UDP.";
    reference
      "RFC 768 User Datagram Protocol
       RFC 793 Transmission Control Protocol";
  }

  typedef uri {
    type string;
    description
      "An ASCII-encoded Uniform Resource Identifier (URI) as defined
      in RFC 3986.";
    reference
      "RFC 3986 Uniform Resource Identifier (URI): Generic Syntax";
  }

  typedef url {
    type string;
    description
      "An ASCII-encoded Uniform Resource Locator (URL) as defined
      in RFC 3986, section 1.1.3";
    reference
      "RFC 3986, paragraph 1.1.3";
  }

}