Additional Considerations for UDP Encapsulation of Stream Control Transmission Protocol (SCTP) Packets
draft-tuexen-tsvwg-sctp-udp-encaps-cons-03
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.
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This Internet-Draft will expire on 2 April 2021.
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Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Please review these documents carefully, as they describe your rights
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Internet-Draft Considerations for SCTP over UDP September 2020
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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.
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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
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