0-RTT TCP Convert Protocol
draft-ietf-tcpm-converters-19

Document Type Active Internet-Draft (tcpm WG)
Last updated 2020-05-14 (latest revision 2020-03-22)
Replaces draft-bonaventure-mptcp-converters
Stream IETF
Intended RFC status Experimental
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Document shepherd Michael Scharf
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IESG IESG state RFC Ed Queue
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Send notices to Michael Scharf <michael.scharf@hs-esslingen.de>
IANA IANA review state Version Changed - Review Needed
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RFC Editor RFC Editor state RFC-EDITOR
TCPM Working Group                                   O. Bonaventure, Ed.
Internet-Draft                                                  Tessares
Intended status: Experimental                          M. Boucadair, Ed.
Expires: September 22, 2020                                       Orange
                                                           S. Gundavelli
                                                                   Cisco
                                                                  S. Seo
                                                           Korea Telecom
                                                              B. Hesmans
                                                                Tessares
                                                          March 21, 2020

                       0-RTT TCP Convert Protocol
                     draft-ietf-tcpm-converters-19

Abstract

   This document specifies an application proxy, called Transport
   Converter, to assist the deployment of TCP extensions such as
   Multipath TCP.  A Transport Converter may provide conversion service
   for one or more TCP extensions.  The conversion service is provided
   by means of the TCP Convert Protocol (Convert).

   This protocol provides 0-RTT (Zero Round-Trip Time) conversion
   service since no extra delay is induced by the protocol compared to
   connections that are not proxied.  Also, the Convert Protocol does
   not require any encapsulation (no tunnels, whatsoever).

   This specification assumes an explicit model, where the Transport
   Converter is explicitly configured on hosts.  As a sample
   applicability use case, this document specifies how the Convert
   Protocol applies for Multipath TCP.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://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."

Bonaventure, et al.    Expires September 22, 2020               [Page 1]
Internet-Draft              Convert Protocol                  March 2020

   This Internet-Draft will expire on September 22, 2020.

Copyright Notice

   Copyright (c) 2020 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
   (https://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
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   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  The Problem . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Network-Assisted Connections: The Rationale . . . . . . .   4
     1.3.  Applicability Scope . . . . . . . . . . . . . . . . . . .   6
   2.  Differences with SOCKSv5  . . . . . . . . . . . . . . . . . .   6
   3.  Conventions and Definitions . . . . . . . . . . . . . . . . .   8
   4.  Architecture & Behaviors  . . . . . . . . . . . . . . . . . .   9
     4.1.  Functional Elements . . . . . . . . . . . . . . . . . . .   9
     4.2.  Theory of Operation . . . . . . . . . . . . . . . . . . .  11
     4.3.  Data Processing at the Transport Converter  . . . . . . .  14
     4.4.  Address Preservation vs. Address Sharing  . . . . . . . .  16
       4.4.1.  Address Preservation  . . . . . . . . . . . . . . . .  16
       4.4.2.  Address/Prefix Sharing  . . . . . . . . . . . . . . .  17
   5.  Sample Examples . . . . . . . . . . . . . . . . . . . . . . .  18
     5.1.  Outgoing Converter-Assisted Multipath TCP Connections . .  18
     5.2.  Incoming Converter-Assisted Multipath TCP Connection  . .  20
   6.  The Convert Protocol (Convert)  . . . . . . . . . . . . . . .  21
     6.1.  The Convert Fixed Header  . . . . . . . . . . . . . . . .  22
     6.2.  Convert TLVs  . . . . . . . . . . . . . . . . . . . . . .  23
       6.2.1.  Generic Convert TLV Format  . . . . . . . . . . . . .  23
       6.2.2.  Summary of Supported Convert TLVs . . . . . . . . . .  24
       6.2.3.  The Info TLV  . . . . . . . . . . . . . . . . . . . .  25
       6.2.4.  Supported TCP Extensions TLV  . . . . . . . . . . . .  25
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