Delay-Tolerant Networking TCP Convergence Layer Protocol Version 4
draft-ietf-dtn-tcpclv4-07

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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: September 21, 2018                                       J. Ott
                                                        Aalto University
                                                            S. Perreault
                                                            Mar 20, 2018

   Delay-Tolerant Networking TCP Convergence Layer Protocol Version 4
                       draft-ietf-dtn-tcpclv4-07

Abstract

   This document describes a revised protocol for the TCP-based
   convergence layer (TCPCL) for Delay-Tolerant Networking (DTN).  The
   protocol revision is based on implementation issues in the original
   TCPCL Version 3 and updates to the Bundle Protocol contents,
   encodings, and convergence layer requirements in Bundle Protocol
   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.  Several new IANA registries are defined
   for TCPCLv4 which define some behaviors inherited from TCPCLv3 but
   with updated encodings and/or semantics.

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
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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
   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 September 21, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Sipos, et al.          Expires September 21, 2018               [Page 1]
Internet-Draft                 DTN TCPCLv4                      Mar 2018

   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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Convergence Layer Services  . . . . . . . . . . . . . . .   4
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   6
     2.1.  Definitions Specific to the TCPCL Protocol  . . . . . . .   6
   3.  General Protocol Description  . . . . . . . . . . . . . . . .   7
     3.1.  TCPCL Session Overview  . . . . . . . . . . . . . . . . .   7
     3.2.  Example Message Exchange  . . . . . . . . . . . . . . . .   8
   4.  Session Establishment . . . . . . . . . . . . . . . . . . . .  10
     4.1.  TCP Connection  . . . . . . . . . . . . . . . . . . . . .  11
     4.2.  Contact Header  . . . . . . . . . . . . . . . . . . . . .  11
       4.2.1.  Header Extension Items  . . . . . . . . . . . . . . .  14
     4.3.  Validation and Parameter Negotiation  . . . . . . . . . .  15
       4.3.1.  Reactive Fragmentation Extension  . . . . . . . . . .  16
     4.4.  Session Security  . . . . . . . . . . . . . . . . . . . .  17
       4.4.1.  TLS Handshake Result  . . . . . . . . . . . . . . . .  18
       4.4.2.  Example TLS Initiation  . . . . . . . . . . . . . . .  18
   5.  Established Session Operation . . . . . . . . . . . . . . . .  19
     5.1.  Message Type Codes  . . . . . . . . . . . . . . . . . . .  19
     5.2.  Upkeep and Status Messages  . . . . . . . . . . . . . . .  20
       5.2.1.  Session Upkeep (KEEPALIVE)  . . . . . . . . . . . . .  20
       5.2.2.  Message Rejection (MSG_REJECT)  . . . . . . . . . . .  21
     5.3.  Bundle Transfer . . . . . . . . . . . . . . . . . . . . .  22
       5.3.1.  Bundle Transfer ID  . . . . . . . . . . . . . . . . .  23
       5.3.2.  Transfer Initialization (XFER_INIT) . . . . . . . . .  23
       5.3.3.  Data Transmission (XFER_SEGMENT)  . . . . . . . . . .  24
       5.3.4.  Data Acknowledgments (XFER_ACK) . . . . . . . . . . .  26
       5.3.5.  Transfer Refusal (XFER_REFUSE)  . . . . . . . . . . .  27
   6.  Session Termination . . . . . . . . . . . . . . . . . . . . .  29