Path Layer UDP Substrate Specification
draft-trammell-plus-spec-01

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Network Working Group                                        B. Trammell
Internet-Draft                                             M. Kuehlewind
Intended status: Experimental                                 ETH Zurich
Expires: September 14, 2017                               March 13, 2017

                 Path Layer UDP Substrate Specification
                      draft-trammell-plus-spec-01

Abstract

   This document specifies a common Path Layer UDP Substrate (PLUS) wire
   image for encrypted transport protocols carried over UDP.  The base
   PLUS header carries information for driving a minimal state machine
   at middleboxes described in [I-D.trammell-plus-statefulness], and
   provides optional exposure of additional information to devices along
   the path using the mechanism described in
   [I-D.trammell-plus-abstract-mech].

Status of This Memo

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   This Internet-Draft will expire on September 14, 2017.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Trammell & Kuehlewind  Expires September 14, 2017               [Page 1]
Internet-Draft                  PLUS Spec                     March 2017

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notational Conventions  . . . . . . . . . . . . . . . . .   3
   2.  State Maintenance and Measurement: Basic Header . . . . . . .   3
     2.1.  Sender Behavior . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Receiver Behavior . . . . . . . . . . . . . . . . . . . .   5
     2.3.  On-Path State Maintenance using the Basic Header  . . . .   6
       2.3.1.  State Establishment . . . . . . . . . . . . . . . . .   7
       2.3.2.  Bidirectional Stop Signaling  . . . . . . . . . . . .   8
       2.3.3.  State Rebinding . . . . . . . . . . . . . . . . . . .   8
     2.4.  Measurement and Diagnosis using the Basic Header  . . . .   9
   3.  Path Communication: Extended Header . . . . . . . . . . . . .   9
     3.1.  Measurement and Diagnostics using the Extended Header . .  12
   4.  Implementation and Deployment Considerations  . . . . . . . .  13
     4.1.  Interface to Overlying Transport  . . . . . . . . . . . .  13
     4.2.  Discovery . . . . . . . . . . . . . . . . . . . . . . . .  14
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  14
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   This document defines a wire image for a Path Layer UDP Substrate
   (PLUS), for limited exposure of information from encrypted, UDP-
   encapsulated [RFC0768] transport protocols.  The wire image
   implements signaling to drive the minimal state machine defined in
   [I-D.trammell-plus-statefulness] as well as optional exposure of
   additional information to devices along the path using the mechanism
   described in [I-D.trammell-plus-abstract-mech].

   As discussed in [I-D.hardie-path-signals], basic information about
   flows currently exposed by TCP are missing from transport protocols
   that encrypt their headers.  Given the ossification of protocol wire
   images due to the widespread deployment of stateful network devices
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