Flow Identity Extension for HTTP-Enabled Location Delivery (HELD)
RFC 6915

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Internet Engineering Task Force (IETF)                         R. Bellis
Request for Comments: 6915                                    Nominet UK
Updates: 6155                                                 April 2013
Category: Standards Track
ISSN: 2070-1721

   Flow Identity Extension for HTTP-Enabled Location Delivery (HELD)

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 a 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 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 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6915.

Bellis                       Standards Track                    [Page 1]
RFC 6915                 Flow Identity for HELD               April 2013

Copyright Notice

   Copyright (c) 2013 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
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  3
   3.  Usage  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . .  5
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  6
     5.1.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:geopriv:held:flow . . . . . . . . .  6
     5.2.  XML Schema Registration  . . . . . . . . . . . . . . . . .  7
   6.  Privacy Considerations . . . . . . . . . . . . . . . . . . . .  7
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  8
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     9.1. Normative References  . . . . . . . . . . . . . . . . . . .  8
     9.2. Informative References  . . . . . . . . . . . . . . . . . .  8

Bellis                       Standards Track                    [Page 2]
RFC 6915                 Flow Identity for HELD               April 2013

1.  Introduction

   Work at the Emergency Location Task Group of NICC Standards Limited
   (the UK's telecoms industry standards body) prompted the addition of
   port number identifiers in HELD Identity [RFC6155] to allow HELD
   [RFC5985] requests for Devices that are behind NAT devices.

   Subsequent analysis has determined that in the presence of particular
   types of NAT devices, 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
   subsequently the true Device.

   This document specifies an XML Schema and a URN Sub-Namespace for a
   Flow Identity Extension to support this requirement and provides a
   more generally applicable means of identifying a Device based on the
   parameters of a network flow of which it is an endpoint.

   Since the Location Recipient may not know in advance whether the
   Device is behind a NAT device, the port number elements from Section
   3.3 of [RFC6155] are deprecated and MUST NOT be used in new client
   implementations.  Note that server implementations of this
   specification may still encounter requests formed by clients that
   have implemented only [RFC6155], and those requests might contain the
   deprecated port element.

   For implementation details not specified in this document, please