Delay-Tolerant Networking TCP Convergence Layer Protocol Version 4
draft-ietf-dtn-tcpclv4-26

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Delay-Tolerant Networking                                       B. Sipos
Internet-Draft                                           RKF Engineering
Intended status: Standards Track                               M. Demmer
Expires: 19 August 2021                                      UC Berkeley
                                                                  J. Ott
                                                        Aalto University
                                                            S. Perreault
                                                        15 February 2021

   Delay-Tolerant Networking TCP Convergence Layer Protocol Version 4
                       draft-ietf-dtn-tcpclv4-26

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
   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 19 August 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Sipos, et al.            Expires 19 August 2021                 [Page 1]
Internet-Draft                 DTN TCPCLv4                 February 2021

   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 to this document.  Code Components
   extracted from this document must 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.  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  . . . . . . . . . . . . . . . . .  12
     3.3.  TCPCL States and Transitions  . . . . . . . . . . . . . .  13
     3.4.  PKIX Environments and CA Policy . . . . . . . . . . . . .  19
     3.5.  Session Keeping Policies  . . . . . . . . . . . . . . . .  20
     3.6.  Transfer Segmentation Policies  . . . . . . . . . . . . .  21
     3.7.  Example Message Exchange  . . . . . . . . . . . . . . . .  22
   4.  Session Establishment . . . . . . . . . . . . . . . . . . . .  24
     4.1.  TCP Connection  . . . . . . . . . . . . . . . . . . . . .  24
     4.2.  Contact Header  . . . . . . . . . . . . . . . . . . . . .  25
     4.3.  Contact Validation and Negotiation  . . . . . . . . . . .  26
     4.4.  Session Security  . . . . . . . . . . . . . . . . . . . .  28
       4.4.1.  Entity Identification . . . . . . . . . . . . . . . .  28
       4.4.2.  Certificate Profile for TCPCL . . . . . . . . . . . .  29
       4.4.3.  TLS Handshake . . . . . . . . . . . . . . . . . . . .  31
       4.4.4.  TLS Authentication  . . . . . . . . . . . . . . . . .  32
       4.4.5.  Policy Recommendations  . . . . . . . . . . . . . . .  33
       4.4.6.  Example TLS Initiation  . . . . . . . . . . . . . . .  34
     4.5.  Message Header  . . . . . . . . . . . . . . . . . . . . .  36
     4.6.  Session Initialization Message (SESS_INIT)  . . . . . . .  37
     4.7.  Session Parameter Negotiation . . . . . . . . . . . . . .  39
     4.8.  Session Extension Items . . . . . . . . . . . . . . . . .  40
   5.  Established Session Operation . . . . . . . . . . . . . . . .  41
     5.1.  Upkeep and Status Messages  . . . . . . . . . . . . . . .  41
       5.1.1.  Session Upkeep (KEEPALIVE)  . . . . . . . . . . . . .  41