A SAVI Solution for WLAN
draft-bi-savi-wlan-19

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Network Working Group                                              J. Bi
Internet-Draft                                                     J. Wu
Intended status: Standards Track                                 Y. Wang
Expires: Nov 14, 2020                                Tsinghua University
                                                                  T. Lin
                                            New H3C Technologies Co. Ltd
                                                            May 14, 2020

                        A SAVI Solution for WLAN
                         draft-bi-savi-wlan-19

Abstract

   This document describes a source address validation solution for WLAN
   enabling 802.11i or other security mechanisms.  This mechanism snoops
   NDP and DHCP packets to bind IP address to MAC address, and relies on
   the security of MAC address guaranteed by 802.11i or other mechanisms
   to filter IP spoofing packets.  It can work in the special situations
   described in the charter of SAVI(Source Address Validation
   Improvements) workgroup, such as multiple MAC addresses on one
   interface.  This document describes three different deployment
   scenarios, with solutions for migration of binding entries when hosts
   move from one access point to another.

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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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on Nov 14, 2020.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Bi, et al.                Expires Nov 14, 2020                  [Page 1]
Internet-Draft          A SAVI Solution for WLAN                May 2020

   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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
   3.  IP-MAC Binding  . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Data Structures . . . . . . . . . . . . . . . . . . . . .   3
       3.1.1.  IP-MAC Mapping Table  . . . . . . . . . . . . . . . .   3
       3.1.2.  MAC-IP Mapping Table  . . . . . . . . . . . . . . . .   4
     3.2.  Pre-conditions for binding  . . . . . . . . . . . . . . .   4
     3.3.  Binding IP addresses to MAC addresses . . . . . . . . . .   5
     3.4.  Binding Migration . . . . . . . . . . . . . . . . . . . .   5
     3.5.  Binding Clearing  . . . . . . . . . . . . . . . . . . . .   6
   4.  Source Address Validation . . . . . . . . . . . . . . . . . .   6
   5.  Deployment Scenarios  . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Centralized WLAN  . . . . . . . . . . . . . . . . . . . .   7
       5.1.1.  AP Filtering  . . . . . . . . . . . . . . . . . . . .   7
       5.1.2.  AC Filtering  . . . . . . . . . . . . . . . . . . . .  12
     5.2.  Autonomous WLAN . . . . . . . . . . . . . . . . . . . . .  12
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
     7.1.  Issues with Triggerring Establishment of Binding Entries
           by Data Packets . . . . . . . . . . . . . . . . . . . . .  13
     7.2.  Privacy Considerations  . . . . . . . . . . . . . . . . .  13
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   This document describes a mechanism to perform per packet IP source