GEOPRIV R. Bellis
Internet-Draft Nominet UK
Updates: RFC 6155 (if approved) February 13, 2013
Intended status: Standards Track
Expires: August 17, 2013
Flow Identity Extension for HELD
draft-ietf-geopriv-flow-identity-01
Abstract
RFC 6155 specifies an extension for the HTTP-Enabled Location
Delivery (HELD) Protocol allowing the use of an IP address and port
number to request a Device location based on an individual packet
flow.
However, certain kinds of NAT require that identifiers for both ends
of the packet flow must be specified in order to unambiguously
satisfy the location request.
This document specifies an XML Schema and URN Sub-Namespace for a
Flow Identity Extension for HELD to support this requirement.
This document updates RFC 6155 by deprecating the port number
elements specified therein.
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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material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 17, 2013.
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions used in this document . . . . . . . . . . . . . . 4
3. Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
5.1. URN Sub-Namespace Registration for
urn:ietf:params:xml:ns:geopriv:held:flow . . . . . . . . . 8
5.2. XML Schema Registration . . . . . . . . . . . . . . . . . 8
6. Privacy Considerations . . . . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 10
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 11
9. Notes to the RFC Editor (to be removed) . . . . . . . . . . . 12
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
10.1. Normative References . . . . . . . . . . . . . . . . . . . 13
10.2. Informative References . . . . . . . . . . . . . . . . . . 13
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 14
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1. Introduction
Work at the Emergency Location Task Group of NICC Standards Ltd (the
UK's telecoms industry standards body) prompted the addition of Port
Number identifiers in HELD Identity [RFC6155] to allow HELD [RFC5985]
requests for target Devices that are behind a NAT device.
Subsequent analysis has determined that in the presence of particular
types of NAT device, and in particular Carrier Grade NATs, it is
necessary to know the complete tuple of (layer 3 protocol, layer 4
protocol, source address, source port, destination address,
destination port) in order to unambiguously identify a flow, and
therefore the true target Device.
This document specifies an XML Schema and URN Sub-Namespace for a
Flow Identity Extension to support this requirement.
Since the Location Recipient may not know in advance whether the
Target is behind a NAT device the port number elements from Section
3.3 of [RFC6155] are deprecated and MUST NOT be used. This document
provides a more generally applicable means of identifying a Device
based on the parameters of a network flow of which it is an endpoint.
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2. Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
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3. Usage
An example HELD request is shown below:
geodetic
192.168.1.1
1024
10.0.0.1
80
The element MUST contain:
o a "layer3" attribute with a value of "ipv4" or "ipv6".
o a "layer4" attribute with a value of "udp" [RFC0768], "tcp"
[RFC0793], "sctp" [RFC4960], "dccp" [RFC4340], or a decimal
integer representing any applicable protocol from the IANA
Assigned Internet Protocol Numbers Registry.
and MAY optionally contain:
o a "target" attribute with a value of "src" (default) or "dst" to
indicate which end of the flow is the Target of the
with respect to the HELD protocol.
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4. XML Schema
HELD Flow Identity
This document defines Flow Identity elements for HELD.
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5. IANA Considerations
5.1. URN Sub-Namespace Registration for
urn:ietf:params:xml:ns:geopriv:held:flow
This section registers a new XML namespace,
"urn:ietf:params:xml:ns:geopriv:held:flow", as per the guidelines in
[RFC3688].
URI: urn:ietf:params:xml:ns:geopriv:held:flow
Registrant Contact: IETF GEOPRIV Working Group (geopriv@ietf.org),
Ray Bellis (ray.bellis@nominet.org.uk)
XML:
BEGIN
HELD Flow Identity Parameters
Namespace for HELD Flow Identity Parameters
urn:ietf:params:xml:ns:geopriv:held:flow
See
RFC NEW1.
END
5.2. XML Schema Registration
This section registers an XML schema as per the guidelines in
[RFC3688]
URI: urn:ietf:params:xml:ns:geopriv:held:flow
Registrant Contact: IETF GEOPRIV Working Group (geopriv@ietf.org),
Ray Bellis (ray.bellis@nominet.org.uk)
Schema: The XML for this schema can be found as the entirety of
Section 4 of this document.
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6. Privacy Considerations
This document introduces no new privacy considerations beyond those
in [RFC6155]
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7. Security Considerations
This document introduces no new security considerations beyond those
in [RFC6155]
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8. Acknowledgements
The author wishes to thank the members of the NICC Emergency Location
Task Group, the IETF GeoPriv Working Group, and the authors of
[RFC6155], from which the text for the URN and XML Schema
Registrations were derived.
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9. Notes to the RFC Editor (to be removed)
References to "NEW1" need to be replaced with this document's final
RFC number.
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10. References
10.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
January 2004.
[RFC5985] Barnes, M., "HTTP-Enabled Location Delivery (HELD)",
RFC 5985, September 2010.
[RFC6155] Winterbottom, J., Thomson, M., Tschofenig, H., and R.
Barnes, "Use of Device Identity in HTTP-Enabled Location
Delivery (HELD)", RFC 6155, March 2011.
10.2. Informative References
[RFC0768] Postel, J., "User Datagram Protocol", STD 6, RFC 768,
August 1980.
[RFC0793] Postel, J., "Transmission Control Protocol", STD 7,
RFC 793, September 1981.
[RFC4340] Kohler, E., Handley, M., and S. Floyd, "Datagram
Congestion Control Protocol (DCCP)", RFC 4340, March 2006.
[RFC4960] Stewart, R., "Stream Control Transmission Protocol",
RFC 4960, September 2007.
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Author's Address
Ray Bellis
Nominet UK
Edmund Halley Road
Oxford OX4 4DQ
United Kingdom
Phone: +44 1865 332211
Email: ray.bellis@nominet.org.uk
URI: http://www.nominet.org.uk/
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