Recommendations on the Filtering of IPv6 Packets Containing IPv6 Extension Headers at Transit Routers
draft-ietf-opsec-ipv6-eh-filtering-07

Document Type Active Internet-Draft (opsec WG)
Authors Fernando Gont  , Will LIU 
Last updated 2021-02-10 (latest revision 2021-01-19)
Replaces draft-gont-opsec-ipv6-eh-filtering
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opsec                                                            F. Gont
Internet-Draft                                              SI6 Networks
Intended status: Informational                                    W. Liu
Expires: July 23, 2021                               Huawei Technologies
                                                        January 19, 2021

    Recommendations on the Filtering of IPv6 Packets Containing IPv6
                  Extension Headers at Transit Routers
                 draft-ietf-opsec-ipv6-eh-filtering-07

Abstract

   This document analyzes the security implications of IPv6 Extension
   Headers and associated IPv6 options.  Additionally, it discusses the
   operational and interoperability implications of discarding packets
   based on the IPv6 Extension Headers and IPv6 options they contain.
   Finally, it provides advice on the filtering of such IPv6 packets at
   transit routers for traffic *not* directed to them, for those cases
   where such filtering is deemed as necessary.

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/.

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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on July 23, 2021.

Copyright Notice

   Copyright (c) 2021 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
   carefully, as they describe your rights and restrictions with respect

Gont & Liu                Expires July 23, 2021                 [Page 1]
Internet-Draft     Filtering of IPv6 packets with EHs       January 2021

   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.  Terminology and Conventions Used in This Document . . . . . .   4
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Applicability Statement . . . . . . . . . . . . . . . . .   4
     2.3.  Conventions . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  IPv6 Extension Headers  . . . . . . . . . . . . . . . . . . .   5
     3.1.  General Discussion  . . . . . . . . . . . . . . . . . . .   5
     3.2.  General Security Implications . . . . . . . . . . . . . .   6
     3.3.  Summary of Advice on the Handling of IPv6 Packets with
           Specific IPv6 Extension Headers . . . . . . . . . . . . .   6
     3.4.  Advice on the Handling of IPv6 Packets with Specific IPv6
           Extension Headers . . . . . . . . . . . . . . . . . . . .   7
     3.5.  Advice on the Handling of Packets with Unknown IPv6
           Extension Headers . . . . . . . . . . . . . . . . . . . .  16
   4.  IPv6 Options  . . . . . . . . . . . . . . . . . . . . . . . .  17
     4.1.  General Discussion  . . . . . . . . . . . . . . . . . . .  17
     4.2.  General Security Implications of IPv6 Options . . . . . .  17
     4.3.  Advice on the Handling of Packets with Specific IPv6
           Options . . . . . . . . . . . . . . . . . . . . . . . . .  17
     4.4.  Advice on the handling of Packets with Unknown IPv6
           Options . . . . . . . . . . . . . . . . . . . . . . . . .  30
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  30
   6.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  30
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  30
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  31
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  31
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  31
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  35
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  37

1.  Introduction

   IPv6 Extension Headers (EHs) allow for the extension of the IPv6
   protocol, and provide support for core functionality such as IPv6
   fragmentation.  However, common implementation limitations suggest
   that EHs present a challenge for IPv6 packet routing equipment,
   particularly when the IPv6 header chain needs to be processed for
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