Path Layer UDP Substrate Specification
draft-trammell-plus-spec-01
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Network Working Group B. Trammell
Internet-Draft M. Kuehlewind
Intended status: Experimental ETH Zurich
Expires: September 14, 2017 March 13, 2017
Path Layer UDP Substrate Specification
draft-trammell-plus-spec-01
Abstract
This document specifies a common Path Layer UDP Substrate (PLUS) wire
image for encrypted transport protocols carried over UDP. The base
PLUS header carries information for driving a minimal state machine
at middleboxes described in [I-D.trammell-plus-statefulness], and
provides optional exposure of additional information to devices along
the path using the mechanism described in
[I-D.trammell-plus-abstract-mech].
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 http://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 September 14, 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
(http://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
Trammell & Kuehlewind Expires September 14, 2017 [Page 1]
Internet-Draft PLUS Spec March 2017
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Notational Conventions . . . . . . . . . . . . . . . . . 3
2. State Maintenance and Measurement: Basic Header . . . . . . . 3
2.1. Sender Behavior . . . . . . . . . . . . . . . . . . . . . 5
2.2. Receiver Behavior . . . . . . . . . . . . . . . . . . . . 5
2.3. On-Path State Maintenance using the Basic Header . . . . 6
2.3.1. State Establishment . . . . . . . . . . . . . . . . . 7
2.3.2. Bidirectional Stop Signaling . . . . . . . . . . . . 8
2.3.3. State Rebinding . . . . . . . . . . . . . . . . . . . 8
2.4. Measurement and Diagnosis using the Basic Header . . . . 9
3. Path Communication: Extended Header . . . . . . . . . . . . . 9
3.1. Measurement and Diagnostics using the Extended Header . . 12
4. Implementation and Deployment Considerations . . . . . . . . 13
4.1. Interface to Overlying Transport . . . . . . . . . . . . 13
4.2. Discovery . . . . . . . . . . . . . . . . . . . . . . . . 14
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
6. Security Considerations . . . . . . . . . . . . . . . . . . . 14
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 14
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.1. Normative References . . . . . . . . . . . . . . . . . . 15
8.2. Informative References . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
1. Introduction
This document defines a wire image for a Path Layer UDP Substrate
(PLUS), for limited exposure of information from encrypted, UDP-
encapsulated [RFC0768] transport protocols. The wire image
implements signaling to drive the minimal state machine defined in
[I-D.trammell-plus-statefulness] as well as optional exposure of
additional information to devices along the path using the mechanism
described in [I-D.trammell-plus-abstract-mech].
As discussed in [I-D.hardie-path-signals], basic information about
flows currently exposed by TCP are missing from transport protocols
that encrypt their headers. Given the ossification of protocol wire
images due to the widespread deployment of stateful network devices
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