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+Network Working Group                                         M. Bagnulo
+Request for Comments: 4581                                          UC3M
+Updates: 3972                                                   J. Arkko
+Category: Standards Track                                       Ericsson
+                                                            October 2006
+
+
+   Cryptographically Generated Addresses (CGA) Extension Field Format
+
+Status of This Memo
+
+   This document specifies an Internet standards track protocol for the
+   Internet community, and requests discussion and suggestions for
+   improvements.  Please refer to the current edition of the "Internet
+   Official Protocol Standards" (STD 1) for the standardization state
+   and status of this protocol.  Distribution of this memo is unlimited.
+
+Copyright Notice
+
+   Copyright (C) The Internet Society (2006).
+
+Abstract
+
+   This document defines a Type-Length-Value format for
+   Cryptographically Generated Address (CGA) Extensions.  This document
+   updates RFC 3972.
+
+Table of Contents
+
+   1. Introduction ....................................................2
+   2. CGA Extension Field Format ......................................2
+   3. IANA Considerations .............................................2
+   4. Security Considerations .........................................3
+   5. Acknowledgements ................................................3
+   6. Normative References ............................................3
+
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+Bagnulo & Arkko             Standards Track                     [Page 1]
+
+RFC 4581               CGA Extension Field Format           October 2006
+
+
+1.  Introduction
+
+   The Cryptographically Generated Address (CGA) specification [1]
+   defines Extension Fields that allow additional information to be
+   included in the CGA Parameter Data Structure.  So far there seems to
+   be enough interest in including additional data items into the CGA
+   Parameter Data Structure through these Extension Fields that it seems
+   reasonable to expect that more than one mechanism will require its
+   usage.  In order to simplify the addition of multiple data items,
+   this document updates RFC 3972 [1], and it defines a Type-Length-
+   Value format for the Extension Fields.
+
+2.  CGA Extension Field Format
+
+   Data items to be included in Extension Fields of the CGA Parameter
+   Data Structure MUST be encoded using the following Type-Length-Value
+   (TLV) format:
+
+    0                   1                   2                   3
+    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   |         Extension Type        |   Extension Data Length       |
+   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+   |                                                               |
+   ~                       Extension Data                          ~
+   |                                                               |
+   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+   Extension Type: 16-bit identifier of the type of the Extension Field.
+
+   Extension Data Length: 16-bit unsigned integer.  Length of the
+   Extension Data field of this option, in octets.
+
+   Extension Data: Variable-length field.  Extension-Type-specific data.
+
+3.  IANA Considerations
+
+   The IANA has created and will maintain a registry entitled, "CGA
+   Extension Type".  The values in this name space are 16-bit unsigned
+   integers.  Initial values for the CGA Extension Type field are given
+   below; future assignments are to be made through Standards Action
+   [2].  Assignments consist of a name and the value.
+
+   As recommended in [3], this document makes the following assignments
+   for experimental and testing use: the value 0xFFFD, with name
+   Exp_FFFD; the value 0xFFFE, with name Exp_FFFE, and the value 0xFFFF,
+   with name Exp_FFFF.
+
+
+
+
+Bagnulo & Arkko             Standards Track                     [Page 2]
+
+RFC 4581               CGA Extension Field Format           October 2006
+
+
+4.  Security Considerations
+
+   No security concerns are raised by the adoption of the CGA Extension
+   format described in this document.  However, proper security analysis
+   is required when new CGA Extensions are defined in order to make sure
+   that they introduce no new vulnerabilities to the existing CGA
+   schemes.
+
+5.  Acknowledgements
+
+   Comments to this document were provided by Sam Hartman, Allison
+   Mankin, Pekka Savola, Thomas Narten, Tuomas Aura, Stefan Rommer,
+   Julien Laganier, and James Kempf.
+
+6.  Normative References
+
+   [1]  Aura, T., "Cryptographically Generated Addresses (CGA)", RFC
+        3972, March 2005.
+
+   [2]  Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA
+        Considerations Section in RFCs", BCP 26, RFC 2434, October 1998.
+
+   [3]  Narten, T., "Assigning Experimental and Testing Numbers
+        Considered Useful", BCP 82, RFC 3692, January 2004.
+
+Authors' Addresses
+
+   Marcelo Bagnulo
+   Universidad Carlos III de Madrid
+   Av. Universidad 30
+   Leganes, Madrid  28911
+   SPAIN
+
+   Phone: 34 91 6249500
+   EMail: marcelo@it.uc3m.es
+   URI:   http://www.it.uc3m.es
+
+
+   Jari Arkko
+   Ericsson
+   Jorvas  02420
+   Finland
+
+   EMail: jari.arkko@ericsson.com
+
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+
+
+Bagnulo & Arkko             Standards Track                     [Page 3]
+
+RFC 4581               CGA Extension Field Format           October 2006
+
+
+Full Copyright Statement
+
+   Copyright (C) The Internet Society (2006).
+
+   This document is subject to the rights, licenses and restrictions
+   contained in BCP 78, and except as set forth therein, the authors
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+
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+Acknowledgement
+
+   Funding for the RFC Editor function is provided by the IETF
+   Administrative Support Activity (IASA).
+
+
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+Bagnulo & Arkko             Standards Track                     [Page 4]
+