Recommendations on the Filtering of IPv6 Packets Containing IPv6 Extension Headers
draft-ietf-opsec-ipv6-eh-filtering-06

Document Type Active Internet-Draft (opsec WG)
Last updated 2018-10-29 (latest revision 2018-07-02)
Replaces draft-gont-opsec-ipv6-eh-filtering
Stream IETF
Intended RFC status Informational
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Stream WG state Submitted to IESG for Publication
Document shepherd √Čric Vyncke
Shepherd write-up Show (last changed 2018-10-29)
IESG IESG state Publication Requested
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opsec                                                            F. Gont
Internet-Draft                                    UTN-FRH / SI6 Networks
Intended status: Informational                                    W. Liu
Expires: January 3, 2019                             Huawei Technologies
                                                            July 2, 2018

    Recommendations on the Filtering of IPv6 Packets Containing IPv6
                           Extension Headers
                 draft-ietf-opsec-ipv6-eh-filtering-06

Abstract

   It is common operator practice to mitigate security risks by
   enforcing appropriate packet filtering.  This document analyzes both
   the general security implications of IPv6 Extension Headers and the
   specific security implications of each Extension Header and Option
   type.  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 in which
   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
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   This Internet-Draft will expire on January 3, 2019.

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

Gont & Liu               Expires January 3, 2019                [Page 1]
Internet-Draft     Filtering of IPv6 packets with EHs          July 2018

   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology and Conventions Used in This Document . . . . . .   3
     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 . . . . . . . . . . . . . . . . . . . . . . . . .  29
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  29
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  30
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  30
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  30
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  30
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  34
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  35

1.  Introduction

   Recent studies (see e.g.  [RFC7872]) suggest that there is widespread
   dropping of IPv6 packets that contain IPv6 Extension Headers (EHs).
   In some cases, such packet drops occur at transit routers.  While
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