The IPv6 Unrecognized Option
draft-bonica-6man-unrecognized-opt-01

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6man                                                           R. Bonica
Internet-Draft                                          Juniper Networks
Intended status: Standards Track                                J. Leddy
Expires: December 10, 2018                                       Comcast
                                                            June 8, 2018

                      The IPv6 Unrecognized Option
                 draft-bonica-6man-unrecognized-opt-01

Abstract

   This document describes a method by which a source node can determine
   whether the underlying network can a) convey a packet that contains
   IPv6 destination options from itself to a destination node, and b)
   convey an ICMPv6 Parameter Problem message in the reverse direction.

   In order to support this method, this document defines a new IPv6
   option, called the Unrecognized option.  The Unrecognized option is
   not recognized by any destination node and always elicits an ICMPv6
   Parameter Problem message.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on December 10, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  The Unrecognized Option . . . . . . . . . . . . . . . . . . .   4
   4.  Application . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Non-Implementation  . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   In IPv6 [RFC8200], optional internet-layer information is encoded in
   extension headers that are placed between the IPv6 header and the
   upper-layer header.  Two of the extension headers specified in
   [RFC8200], the Hop-by-Hop Options header and the Destination Options
   header, carry a variable number of "options".  Each option contains
   the following fields:

   o  Option Type - 8-bit identifier of the type of option.

   o  Opt Data Len - 8-bit unsigned integer.  Length of the Option Data
      field of this option, in octets.

   o  Option Data - Variable-length field.  Option-Type-specific data.

   The Option Type identifiers are encoded so that their highest-order 2
   bits specify the action that must be taken if the processing IPv6
   node does not recognize the option.  Actions follow:

   o  00 - Skip over this option and continue processing the header.

   o  01 - Discard the packet.

   o  10 - Discard the packet and, regardless of whether or not the
      packet's Destination Address was a multicast address, send an

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      ICMPv6 [RFC4443] Parameter Problem, Code 2, message to the
      packet's Source Address, pointing to the unrecognized Option Type.

   o  11 - Discard the packet and, only if the packet's Destination
      Address was not a multicast address, send an ICMPv6 Parameter
      Problem, Code 2, message to the packet's Source Address, pointing
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