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Versions: (draft-bellis-geopriv-flow-identity) 00 02 RFC 6915

GEOPRIV                                                        R. Bellis
Internet-Draft                                                Nominet UK
Updates: RFC 6155 (if approved)                       September 13, 2012
Intended status: Standards Track
Expires: March 17, 2013


                    Flow Identity Extension for HELD
                  draft-ietf-geopriv-flow-identity-00

Abstract

   The GEOPRIV Working Group previously specified how to use an IP
   address and port number to request a 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 specifieds a Flow Identity Extension for the HTTP-
   Enabled Location Delivery (HELD) Protocol to support this
   requirement.

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
   working documents as Internet-Drafts.  The list of current Internet-
   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 March 17, 2013.

Copyright Notice

   Copyright (c) 2012 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



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   (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  . . . . . . . . . . . . . .  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 Working Group of NICC Standards Ltd
   (the UK's telecoms 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 creates an XML Schema and URN Sub-Namespace for a Flow
   Identity Extension to support this requirement.



































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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 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:

   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
      <locationRequest> with respect to the HELD protocol.

   Since the Location Recipient may not know in advance whether the
   Target is behind a NAT the port number elements from Section 3.3 of
   [RFC6155] are deprecated and SHOULD NOT be used.













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4.  XML Schema

   <?xml version="1.0" encoding="UTF-8"?>
   <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:sequence>
         <xs:element name="src" type="flow:flowEndpoint"/>
         <xs:element name="dst" type="flow:flowEndpoint"/>
       </xs:sequence>
       <xs:attribute name="target" default="src">
         <xs:simpleType>
           <xs:restriction base="xs:token">
             <xs:pattern value="(src|dst)"/>
           </xs:restriction>
         </xs:simpleType>
       </xs:attribute>
       <xs:attribute name="layer3" use="required">
         <xs:simpleType>
           <xs:restriction base="xs:token">
             <xs:pattern value="(ipv4|ipv6)"/>
           </xs:restriction>
         </xs:simpleType>
       </xs:attribute>
       <xs:attribute name="layer4" use="required">
         <xs:simpleType>
           <xs:restriction base="xs:token">
             <xs:pattern value="(udp|tcp|sctp|dccp|\d+)"/>
           </xs:restriction>
         </xs:simpleType>
       </xs:attribute>
     </xs:complexType>




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     <xs:complexType name="flowEndpoint">
       <xs:all>
         <xs:element name="address">
           <xs:simpleType>
             <xs:restriction base="xs:token"/>
           </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>


































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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
     <?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.






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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 EmLoc Working
   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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