GEOPRIV R.P. Bellis
Internet-Draft Nominet UK
Updates: RFC 6155 (if approved) February 2012
Intended status: Informational
Expires: August 02, 2012

Flow Identity Extension for HELD

Abstract

Identity Extensions using an IP address and port number to request a location based on an individual packet flow have been previously specified by the GEOPRIV Working Group.

However certain kinds on NAT require that identifiers for both ends of the packet flow must be specified in order to unambiguously satisfy the location request.

This document specifieds a Flow Identity Extension for the HTTP-Enabled Location Delivery (HELD) Protocol to support this requirement.

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Status of this Memo

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This Internet-Draft will expire on August 02, 2012.

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Table of Contents

1. Introduction

Work at the Emergency Location Working Group of NICC Standards Ltd (the UK's telecoms standards body) prompted the addition of Port Number identifiers in [RFC6155]HELD Identity

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 creates an XML Schema and URN Sub-Namespace for a Flow Identity Etension to support this requirement.

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].

3. Usage

An example HELD request is show below:

<locationRequest xmlns="urn:ietf:params:xml:ns:geopriv:held"
                      responseTime="8">
  <locationType exact="true">geodetic</locationType>
  <flow xmlns="urn:ietf:params:xml:ns:geopriv:held:flow"
    layer4="tcp" layer3="ipv4">
    <src>
      <address>192.168.1.1</address>
      <port>1024</port>
    </src>
    <dst>
      <address>10.0.0.1</address>
      <port>80</port>
    </dst>
  </flow>
</locationRequest>
          

The <flow> element MUST contain a "layer3" attribute with a value of "ipv4" or "ipv6", and a "layer4" attribute with a value of "udp", "tcp", "sctp" or "dccp".

4. XML Schema

<xs:schema targetNamespace="urn:ietf:params:xml:ns:geopriv:held:flow"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  xmlns:flow="urn:ietf:params:xml:ns:geopriv:held:flow"
  elementFormDefault="qualified">

  <xs:annotation>
    <xs:appinfo source="urn:ietf:params:xml:schema:geopriv:held:flow">
      HELD Flow Identity</xs:appinfo>
    <xs:documentation
      source="http://www.rfc-editor.org/rfc/rfcNEW1.txt">
      This document defines Flow Identity elements for HELD.
    </xs:documentation>
  </xs:annotation>

  <xs:element name="flow" type="flow:flowIdentity"/>

  <xs:complexType name="flowIdentity">
    <xs:all>
      <xs:element name="src" type="flow:flowEndpoint"/>
      <xs:element name="dst" type="flow:flowEndpoint"/>
    </xs:all>
    <xs:attribute name="layer3" use="required">
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="ipv4"/>
          <xs:enumeration value="ipv6"/>
        </xs:restriction>
      </xs:simpleType>
    </xs:attribute>
    <xs:attribute name="layer4" use="required">
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="udp"/>
          <xs:enumeration value="tcp"/>
          <xs:enumeration value="sctp"/>
          <xs:enumeration value="dccp"/>
        </xs:restriction>
      </xs:simpleType>
    </xs:attribute>
  </xs:complexType>

  <xs:complexType name="flowEndpoint">
    <xs:all>
      <xs:element name="address">
        <xs:simpleType>
          <xs:restriction base="xs:string"/>
        </xs:simpleType>
      </xs:element>
      <xs:element name="port">
        <xs:simpleType>
          <xs:restriction base="xs:unsignedShort">
            <xs:minInclusive value="1"/>
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
    </xs:all>
  </xs:complexType>

</xs:schema>

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
  <?xml version="1.0"?>
  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
  <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
    <head>
      <title>HELD Flow Identity Parameters</title>
    </head>
    <body>
      <h1>Namespace for HELD Flow Identity Parameters</h1>
      <h2>urn:ietf:params:xml:ns:geopriv:held:flow</h2>
      <p>See <a href="http://www.rfc-editor.org/rfc/rfcNEW1.txt">
         RFC NEW1</a>.</p>
    </body>
  </html>
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.

6. Privacy Considerations

This document introduces no new privacy considerations beyond those in [RFC6155]

7. Security Considerations

This document introduces no new security considerations beyond those in [RFC6155]

8. References

8.1. 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.
[RFC5952] Kawamura, S. and M. Kawashima, "A Recommendation for IPv6 Address Text Representation", RFC 5952, August 2010.
[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.

8.2. 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.
[RFC4960] Stewart, R., "Stream Control Transmission Protocol", RFC 4960, September 2007.
[RFC4340] Kohler, E., Handley, M. and S. Floyd, "Datagram Congestion Control Protocol (DCCP)", RFC 4340, March 2006.

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/