IP Traffic Flow Security
draft-hopps-ipsecme-iptfs-00

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Last updated 2019-03-11
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Network Working Group                                           C. Hopps
Internet-Draft                                   LabN Consulting, L.L.C.
Intended status: Standards Track                          March 11, 2019
Expires: September 12, 2019

                        IP Traffic Flow Security
                      draft-hopps-ipsecme-iptfs-00

Abstract

   This document describes a mechanism to enhance IPsec traffic flow
   security by adding traffic flow confidentiality to encrypted IP
   encapsulated traffic.  Traffic flow confidentiality is provided by
   obscuring the size and frequency of IP traffic using a fixed-sized,
   constant-send-rate IPsec tunnel.  The solution allows for congestion
   control as well.

Status of This Memo

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   This Internet-Draft will expire on September 12, 2019.

Copyright Notice

   Copyright (c) 2019 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
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   include Simplified BSD License text as described in Section 4.e of

Hopps                  Expires September 12, 2019               [Page 1]
Internet-Draft          IP Traffic Flow Security              March 2019

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology & Concepts  . . . . . . . . . . . . . . . . .   3
   2.  The IP-TFS Tunnel . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Tunnel Content  . . . . . . . . . . . . . . . . . . . . .   4
       2.1.1.  IPSec/ESP Payload . . . . . . . . . . . . . . . . . .   4
       2.1.2.  Data-Blocks . . . . . . . . . . . . . . . . . . . . .   5
       2.1.3.  No Implicit Padding . . . . . . . . . . . . . . . . .   5
       2.1.4.  IP Header Value Mapping . . . . . . . . . . . . . . .   6
     2.2.  Exclusive SA Use  . . . . . . . . . . . . . . . . . . . .   6
     2.3.  Initiation of TFS mode  . . . . . . . . . . . . . . . . .   6
     2.4.  Example of an encapsulated IP packet flow . . . . . . . .   7
     2.5.  Modes of operation  . . . . . . . . . . . . . . . . . . .   7
       2.5.1.  Non-Congestion Controlled Mode  . . . . . . . . . . .   7
       2.5.2.  Congestion Controlled Mode  . . . . . . . . . . . . .   8
   3.  Congestion Information  . . . . . . . . . . . . . . . . . . .   9
     3.1.  ECN Support . . . . . . . . . . . . . . . . . . . . . . .   9
   4.  Configuration . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.1.  Bandwidth . . . . . . . . . . . . . . . . . . . . . . . .  10
     4.2.  Fixed Packet Size . . . . . . . . . . . . . . . . . . . .  10
     4.3.  Congestion Information Configuration  . . . . . . . . . .  10
   5.  Packet and Data Formats . . . . . . . . . . . . . . . . . . .  11
     5.1.  IPSec . . . . . . . . . . . . . . . . . . . . . . . . . .  11
       5.1.1.  Payload Format  . . . . . . . . . . . . . . . . . . .  11
       5.1.2.  Data Blocks . . . . . . . . . . . . . . . . . . . . .  12
     5.2.  IKEv2 . . . . . . . . . . . . . . . . . . . . . . . . . .  13
       5.2.1.  IKEv2 Congestion Information Configuration Attribute   13
       5.2.2.  IKEv2 Congestion Information Notification Data  . . .  14
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Appendix A.  Comparisons of IP-TFS  . . . . . . . . . . . . . . .  17
     A.1.  Comparing Overhead  . . . . . . . . . . . . . . . . . . .  17
       A.1.1.  IP-TFS Overhead . . . . . . . . . . . . . . . . . . .  17
       A.1.2.  ESP with Padding Overhead . . . . . . . . . . . . . .  18
     A.2.  Overhead Comparison . . . . . . . . . . . . . . . . . . .  19
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