Delay-Tolerant Networking TCP Convergence Layer Protocol Version 4
draft-ietf-dtn-tcpclv4-12

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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: October 2, 2019                                          J. Ott
                                                        Aalto University
                                                            S. Perreault
                                                          March 31, 2019

   Delay-Tolerant Networking TCP Convergence Layer Protocol Version 4
                       draft-ietf-dtn-tcpclv4-12

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 of RFC7242 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 October 2, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Sipos, et al.            Expires October 2, 2019                [Page 1]
Internet-Draft                 DTN TCPCLv4                    March 2019

   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.  Convergence Layer Services  . . . . . . . . . . . . . . .   4
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   6
     2.1.  Definitions Specific to the TCPCL Protocol  . . . . . . .   6
   3.  General Protocol Description  . . . . . . . . . . . . . . . .   9
     3.1.  TCPCL Session Overview  . . . . . . . . . . . . . . . . .   9
     3.2.  TCPCL States and Transitions  . . . . . . . . . . . . . .  11
     3.3.  Transfer Segmentation Policies  . . . . . . . . . . . . .  16
     3.4.  Example Message Exchange  . . . . . . . . . . . . . . . .  17
   4.  Session Establishment . . . . . . . . . . . . . . . . . . . .  19
     4.1.  TCP Connection  . . . . . . . . . . . . . . . . . . . . .  19
     4.2.  Contact Header  . . . . . . . . . . . . . . . . . . . . .  19
     4.3.  Contact Validation and Negotiation  . . . . . . . . . . .  20
     4.4.  Session Security  . . . . . . . . . . . . . . . . . . . .  21
       4.4.1.  TLS Handshake Result  . . . . . . . . . . . . . . . .  22
       4.4.2.  Example TLS Initiation  . . . . . . . . . . . . . . .  22
     4.5.  Message Type Codes  . . . . . . . . . . . . . . . . . . .  23
     4.6.  Session Initialization Message (SESS_INIT)  . . . . . . .  24
     4.7.  Session Parameter Negotiation . . . . . . . . . . . . . .  26
     4.8.  Session Extension Items . . . . . . . . . . . . . . . . .  27
   5.  Established Session Operation . . . . . . . . . . . . . . . .  28
     5.1.  Upkeep and Status Messages  . . . . . . . . . . . . . . .  28
       5.1.1.  Session Upkeep (KEEPALIVE)  . . . . . . . . . . . . .  28
       5.1.2.  Message Rejection (MSG_REJECT)  . . . . . . . . . . .  29
     5.2.  Bundle Transfer . . . . . . . . . . . . . . . . . . . . .  30
       5.2.1.  Bundle Transfer ID  . . . . . . . . . . . . . . . . .  30
       5.2.2.  Data Transmission (XFER_SEGMENT)  . . . . . . . . . .  31
       5.2.3.  Data Acknowledgments (XFER_ACK) . . . . . . . . . . .  33