Delay-Tolerant Networking TCP Convergence Layer Protocol Version 4
draft-ietf-dtn-tcpclv4-20

The information below is for an old version of the document
Document Type Active Internet-Draft (dtn WG)
Authors Brian Sipos  , Michael Demmer  , Joerg Ott  , Simon Perreault 
Last updated 2020-05-15 (latest revision 2020-03-07)
Replaces draft-sipos-dtn-tcpclv4
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication (wg milestone: Jul 2019 - TCP CL update... )
Document shepherd Edward Birrane
Shepherd write-up Show (last changed 2019-08-07)
IESG IESG state IESG Evaluation::AD Followup
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Responsible AD Magnus Westerlund
Send notices to Edward Birrane <edward.birrane@jhuapl.edu>
IANA IANA review state Version Changed - Review Needed
Delay Tolerant Networking                                       B. Sipos
Internet-Draft                                           RKF Engineering
Intended status: Standards Track                               M. Demmer
Expires: November 14, 2020                                   UC Berkeley
                                                                  J. Ott
                                                        Aalto University
                                                            S. Perreault
                                                            May 13, 2020

   Delay-Tolerant Networking TCP Convergence Layer Protocol Version 4
                       draft-ietf-dtn-tcpclv4-20

Abstract

   This document describes a TCP-based convergence layer (TCPCL) for
   Delay-Tolerant Networking (DTN).  This version of the TCPCL protocol
   resolves implementation issues in the earlier TCPCL Version 3 of
   RFC7242 and updates to the Bundle Protocol (BP) contents, encodings,
   and convergence layer requirements in BP Version 7.  Specifically,
   the TCPCLv4 uses CBOR-encoded BPv7 bundles as its service data unit
   being transported and provides a reliable transport of such bundles.
   This version of TCPCL also includes security and extensibility
   mechanisms.

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 https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   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 November 14, 2020.

Copyright Notice

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

Sipos, et al.           Expires November 14, 2020               [Page 1]
Internet-Draft                 DTN TCPCLv4                      May 2020

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   (https://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Definitions Specific to the TCPCL Protocol  . . . . . . .   5
   3.  General Protocol Description  . . . . . . . . . . . . . . . .   9
     3.1.  Convergence Layer Services  . . . . . . . . . . . . . . .   9
     3.2.  TCPCL Session Overview  . . . . . . . . . . . . . . . . .  11
     3.3.  TCPCL States and Transitions  . . . . . . . . . . . . . .  13
     3.4.  Transfer Segmentation Policies  . . . . . . . . . . . . .  19
     3.5.  Example Message Exchange  . . . . . . . . . . . . . . . .  20
   4.  Session Establishment . . . . . . . . . . . . . . . . . . . .  21
     4.1.  TCP Connection  . . . . . . . . . . . . . . . . . . . . .  22
     4.2.  Contact Header  . . . . . . . . . . . . . . . . . . . . .  23
     4.3.  Contact Validation and Negotiation  . . . . . . . . . . .  24
     4.4.  Session Security  . . . . . . . . . . . . . . . . . . . .  25
       4.4.1.  Entity Identification . . . . . . . . . . . . . . . .  26
       4.4.2.  TLS Handshake . . . . . . . . . . . . . . . . . . . .  27
       4.4.3.  TLS Authentication  . . . . . . . . . . . . . . . . .  28
       4.4.4.  Example TLS Initiation  . . . . . . . . . . . . . . .  30
     4.5.  Message Header  . . . . . . . . . . . . . . . . . . . . .  31
     4.6.  Session Initialization Message (SESS_INIT)  . . . . . . .  32
     4.7.  Session Parameter Negotiation . . . . . . . . . . . . . .  34
     4.8.  Session Extension Items . . . . . . . . . . . . . . . . .  35
   5.  Established Session Operation . . . . . . . . . . . . . . . .  36
     5.1.  Upkeep and Status Messages  . . . . . . . . . . . . . . .  36
       5.1.1.  Session Upkeep (KEEPALIVE)  . . . . . . . . . . . . .  36
       5.1.2.  Message Rejection (MSG_REJECT)  . . . . . . . . . . .  37
     5.2.  Bundle Transfer . . . . . . . . . . . . . . . . . . . . .  38
       5.2.1.  Bundle Transfer ID  . . . . . . . . . . . . . . . . .  39
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