Additional Considerations for UDP Encapsulation of Stream Control Transmission Protocol (SCTP) Packets
draft-tuexen-tsvwg-sctp-udp-encaps-cons-03

Document Type Active Internet-Draft (individual)
Authors Michael Tüxen  , Randall Stewart 
Last updated 2020-09-29
Stream (None)
Intended RFC status (None)
Formats plain text html xml pdf htmlized (tools) htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
Network Working Group                                           M. Tüxen
Internet-Draft                           Münster Univ. of Appl. Sciences
Updates: 6951 (if approved)                                R. R. Stewart
Intended status: Standards Track                           Netflix, Inc.
Expires: 2 April 2021                                  29 September 2020

   Additional Considerations for UDP Encapsulation of Stream Control
                  Transmission Protocol (SCTP) Packets
               draft-tuexen-tsvwg-sctp-udp-encaps-cons-03

Abstract

   RFC 6951 specifies the UDP encapsulation of SCTP packets.  The
   described handling of received packets requires the check of the
   verification tag.  However, RFC 6951 misses a specification for the
   handling of received packets for which this check is not possible.

   This document updates RFC 6951 by specifying the handling of received
   packets where the verification tag can not be checked.

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 2 April 2021.

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 carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components

Tüxen & Stewart           Expires 2 April 2021                  [Page 1]
Internet-Draft      Considerations for SCTP over UDP      September 2020

   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Handling of Out of the Blue Packets . . . . . . . . . . . . .   3
   4.  Handling of SCTP Packets Containing an INIT Chunk Matching an
           Existing Associations . . . . . . . . . . . . . . . . . .   3
   5.  Middlebox Considerations  . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   [RFC6951] specifies the UDP encapsulation of SCTP packets.  To be
   able to adopt automatically to changes of the remote UDP
   encapsulation port number, it is updated automatically when
   processing received packets.  This includes automatic enabling and
   disabling of UDP encapsulation.

   Section 5.4 of [RFC6951] describes the processing of received packets
   and requires the check of the verification tag before updating the
   remote UDP encapsulation port and the possible enabling or disabling
   of UDP encapsulation.

   [RFC6951] basically misses a description of the handling of received
   packets where checking the verification tag is not possible.  This
   includes packets for which no association can be found and packets
   containing an INIT chunk, since the verification tag of these packets
   is 0.

2.  Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

Tüxen & Stewart           Expires 2 April 2021                  [Page 2]
Internet-Draft      Considerations for SCTP over UDP      September 2020

3.  Handling of Out of the Blue Packets

   If the processing of an out of the blue packet requires the sending
   of a packet in response according to the rules specified in
   Section 8.4 of [RFC4960], the following rules apply:

   1.  If the received packet was encapsulated in UDP, the response
       packets MUST also be encapsulated in UDP.  The UDP source port
Show full document text