Delay-Tolerant Networking TCP Convergence Layer Protocol Version 4
draft-ietf-dtn-tcpclv4-17

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Delay Tolerant Networking                                       B. Sipos
Internet-Draft                                           RKF Engineering
Obsoletes: 7242 (if approved)                                  M. Demmer
Intended status: Standards Track                             UC Berkeley
Expires: July 22, 2020                                            J. Ott
                                                        Aalto University
                                                            S. Perreault
                                                        January 19, 2020

   Delay-Tolerant Networking TCP Convergence Layer Protocol Version 4
                       draft-ietf-dtn-tcpclv4-17

Abstract

   This document describes a TCP-based convergence layer (TCPCL) for
   Delay-Tolerant Networking (DTN).  This version of the TCPCL protocol
   is based on 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 document is an update of the protocol described in RFC7242,
   reflecting lessons learned.  For this reason it obsoletes RFC7242, an
   IRTF-stream document.

   Note to the RFC editor: The Internet Research Task Force is requested
   to mark RFC7242 as obsolete.

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."

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

Sipos, et al.             Expires July 22, 2020                 [Page 1]
Internet-Draft                 DTN TCPCLv4                  January 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   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.  TLS Handshake . . . . . . . . . . . . . . . . . . . .  25
       4.4.2.  TLS Authentication  . . . . . . . . . . . . . . . . .  27
       4.4.3.  Example TLS Initiation  . . . . . . . . . . . . . . .  28
     4.5.  Message Header  . . . . . . . . . . . . . . . . . . . . .  29
     4.6.  Session Initialization Message (SESS_INIT)  . . . . . . .  31
     4.7.  Session Parameter Negotiation . . . . . . . . . . . . . .  32
     4.8.  Session Extension Items . . . . . . . . . . . . . . . . .  33
   5.  Established Session Operation . . . . . . . . . . . . . . . .  34
     5.1.  Upkeep and Status Messages  . . . . . . . . . . . . . . .  34
       5.1.1.  Session Upkeep (KEEPALIVE)  . . . . . . . . . . . . .  35
       5.1.2.  Message Rejection (MSG_REJECT)  . . . . . . . . . . .  35
     5.2.  Bundle Transfer . . . . . . . . . . . . . . . . . . . . .  36