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SEcure Neighbor Discovery (SEND) Source Address Validation Improvement (SAVI)
RFC 7219

Internet Engineering Task Force (IETF)                        M. Bagnulo
Request for Comments: 7219                            A. Garcia-Martinez
Category: Standards Track                                           UC3M
ISSN: 2070-1721                                                 May 2014

                    SEcure Neighbor Discovery (SEND)
              Source Address Validation Improvement (SAVI)

Abstract

   This memo specifies SEcure Neighbor Discovery (SEND) Source Address
   Validation Improvement (SAVI), a mechanism to provide source address
   validation using the SEND protocol.  The proposed mechanism
   complements ingress filtering techniques to provide a finer
   granularity on the control of IPv6 source addresses.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7219.

Copyright Notice

   Copyright (c) 2014 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
   (http://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
   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.

Bagnulo & Garcia-Martinez    Standards Track                    [Page 1]
RFC 7219                        SEND SAVI                       May 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Background on SEND SAVI . . . . . . . . . . . . . . . . . . .   4
     2.1.  Address Validation Scope  . . . . . . . . . . . . . . . .   4
     2.2.  Binding Creation for SEND SAVI  . . . . . . . . . . . . .   4
     2.3.  SEND SAVI Protection Perimeter  . . . . . . . . . . . . .   7
     2.4.  Special Cases . . . . . . . . . . . . . . . . . . . . . .   9
   3.  SEND SAVI Specification . . . . . . . . . . . . . . . . . . .  11
     3.1.  SEND SAVI Data Structures . . . . . . . . . . . . . . . .  11
     3.2.  SEND SAVI Device Configuration  . . . . . . . . . . . . .  12
     3.3.  Traffic Processing  . . . . . . . . . . . . . . . . . . .  13
       3.3.1.  Transit Traffic Processing  . . . . . . . . . . . . .  13
       3.3.2.  Local Traffic Processing  . . . . . . . . . . . . . .  13
     3.4.  SEND SAVI Port Configuration Guidelines . . . . . . . . .  27
     3.5.  VLAN Support  . . . . . . . . . . . . . . . . . . . . . .  28
     3.6.  Protocol Constants  . . . . . . . . . . . . . . . . . . .  28
   4.  Protocol Walk-Through . . . . . . . . . . . . . . . . . . . .  29
     4.1.  Change of the Attachment Point of a Host  . . . . . . . .  29
       4.1.1.  Moving to a Port of the Same Switch . . . . . . . . .  29
       4.1.2.  Moving to a Port of a Different Switch  . . . . . . .  30
     4.2.  Attack of a Malicious Host  . . . . . . . . . . . . . . .  31
       4.2.1.  M Attaches to the Same Switch as the Victim's Switch   31
       4.2.2.  M Attaches to a Different Switch to the Victim's
               Switch  . . . . . . . . . . . . . . . . . . . . . . .  32
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  33
     5.1.  Protection against Replay Attacks . . . . . . . . . . . .  33
     5.2.  Protection against Denial-of-Service Attacks  . . . . . .  34
     5.3.  Considerations on the Deployment Model for Trust Anchors   36
     5.4.  Residual Threats  . . . . . . . . . . . . . . . . . . . .  36
     5.5.  Privacy Considerations  . . . . . . . . . . . . . . . . .  37
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  37
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  37
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  37
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  38

Bagnulo & Garcia-Martinez    Standards Track                    [Page 2]
RFC 7219                        SEND SAVI                       May 2014

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