module iana-ipv6-ext-types {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:yang:iana-ipv6-ext-types";
  prefix iana-ipv6-ext-types;

  organization
    "Internet Assigned Numbers Authority (IANA)";

  contact
    "Internet Assigned Numbers Authority

     ICANN
     12025 Waterfront Drive, Suite 300
     Los Angeles, CA 90094

     Tel: +1 424 254 5300

     <mailto:iana@iana.org>";

  description
    "This YANG module translates IANA registry 'IPv6 Extension Header
     Types' to YANG derived types.

     Copyright (c) 2025 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 Revised BSD License set
     forth in Section 4.c of the IETF Trust's Legal Provisions
     Relating to IETF Documents
     (https://trustee.ietf.org/license-info).

     This version of this YANG module was generated from the
     corresponding IANA registry using an XSLT stylesheet from the
     'iana-yang' project (https://github.com/llhotka/iana-yang).";

  reference
    "Internet Protocol Version 6 (IPv6) Parameters
     (https://www.iana.org/assignments/ipv6-parameters/)";

  revision 2025-12-22 {
    description
      "Initial version.";
    reference
      "RFC 9899"
      + "iana-ipv6-ext-types@2025-12-22.yang";
  }

  /* Typedefs */

  typedef ipv6-extension-header-type-name {
    type enumeration {
      enum IPv6Hop-by-HopOption {
        value 0;
        description
          "IPv6 Hop-by-Hop Option";
        reference
          "RFC 8200";
      }
      enum RoutingHeaderforIPv6 {
        value 43;
        description
          "Routing Header for IPv6";
        reference
          "RFC 8200
           RFC 5095";
      }
      enum FragmentHeaderforIPv6 {
        value 44;
        description
          "Fragment Header for IPv6";
        reference
          "RFC 8200";
      }
      enum EncapsulatingSecurityPayload {
        value 50;
        description
          "Encapsulating Security Payload";
        reference
          "RFC 4303";
      }
      enum AuthenticationHeader {
        value 51;
        description
          "Authentication Header";
        reference
          "RFC 4302";
      }
      enum DestinationOptionsforIPv6 {
        value 60;
        description
          "Destination Options for IPv6";
        reference
          "RFC 8200";
      }
      enum MobilityHeader {
        value 135;
        description
          "Mobility Header";
        reference
          "RFC 6275";
      }
      enum HostIdentityProtocol {
        value 139;
        description
          "Host Identity Protocol";
        reference
          "RFC 7401";
      }
      enum Shim6Protocol {
        value 140;
        description
          "Shim6 Protocol";
        reference
          "RFC 5533";
      }
    }
    description
      "This enumeration type defines mnemonic names and 
       corresponding numeric values of IPv6 Extension header
       types.";
    reference
      "RFC 2708: IANA Allocation Guidelines For Values In the
       Internet Protocol and Related Headers";
  }

  typedef ipv6-extension-header-type {
    type union {
      type uint8;
      type ipv6-extension-header-type-name;
    }
    description
      "This type allows reference to an IPv6 Extension header 
       type using either the assigned mnemonic name or the 
       numeric protocol number value.";
  }
}