Datagram Transport Layer Security (DTLS) Encapsulation of SCTP Packets
RFC 8261

Document Type RFC - Proposed Standard (November 2017; No errata)
Last updated 2017-11-15
Replaces draft-tuexen-tsvwg-sctp-dtls-encaps
Stream IETF
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Stream WG state Submitted to IESG for Publication (wg milestone: Dec 2014 - Submit 'DTLS Encapsu... )
Document shepherd Gorry Fairhurst
Shepherd write-up Show (last changed 2014-12-06)
IESG IESG state RFC 8261 (Proposed Standard)
Consensus Boilerplate Yes
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Responsible AD Spencer Dawkins
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IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                         M. Tuexen
Request for Comments: 8261              Muenster Univ. of Appl. Sciences
Category: Standards Track                                     R. Stewart
ISSN: 2070-1721                                            Netflix, Inc.
                                                                R. Jesup
                                                WorldGate Communications
                                                               S. Loreto
                                                                Ericsson
                                                           November 2017

 Datagram Transport Layer Security (DTLS) Encapsulation of SCTP Packets

Abstract

   The Stream Control Transmission Protocol (SCTP) is a transport
   protocol originally defined to run on top of the network protocols
   IPv4 or IPv6.  This document specifies how SCTP can be used on top of
   the Datagram Transport Layer Security (DTLS) protocol.  Using the
   encapsulation method described in this document, SCTP is unaware of
   the protocols being used below DTLS; hence, explicit IP addresses
   cannot be used in the SCTP control chunks.  As a consequence, the
   SCTP associations carried over DTLS can only be single-homed.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8261.

Tuexen, et al.               Standards Track                    [Page 1]
RFC 8261                     SCTP over DTLS                November 2017

Copyright Notice

   Copyright (c) 2017 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
   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.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Encapsulation and Decapsulation Procedure . . . . . . . . . .   3
   4.  General Considerations  . . . . . . . . . . . . . . . . . . .   4
   5.  DTLS Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  SCTP Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

Tuexen, et al.               Standards Track                    [Page 2]
RFC 8261                     SCTP over DTLS                November 2017

1.  Overview

   The Stream Control Transmission Protocol (SCTP) as defined in
   [RFC4960] is a transport protocol running on top of the network
   protocols IPv4 [RFC0791] or IPv6 [RFC8200].  This document specifies
   how SCTP is used on top of the Datagram Transport Layer Security
   (DTLS) protocol.  DTLS 1.0 is defined in [RFC4347], and the latest
   version when this RFC was published, DTLS 1.2, is defined in
   [RFC6347].  This encapsulation is used, for example, within the
   WebRTC protocol suite (see [RTC-OVERVIEW] for an overview) for
   transporting non-SRTP data between browsers.  The architecture of
   this stack is described in [DATA-CHAN].

                               +----------+
                               |   SCTP   |
                               +----------+
                               |   DTLS   |
                               +----------+
                               | ICE/UDP  |
                               +----------+

                       Figure 1: Basic Stack Diagram

   This encapsulation of SCTP over DTLS over UDP or ICE/UDP (see
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