Internet DRAFT - draft-bagnulo-shim6-cga-ext
draft-bagnulo-shim6-cga-ext
Network Working Group M. Bagnulo
Internet-Draft UC3M
Updates: 3972 (if approved) J. Arkko
Expires: April 22, 2006 Ericsson
October 19, 2005
Cryptographically Generated Addresses (CGA) Extension Field Format
draft-bagnulo-shim6-cga-ext-01
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Abstract
This document define a Type-Length-Value format for Cryptographically
Generated Address (CGA) Extensions.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. CGA Extension Field Format . . . . . . . . . . . . . . . . . . 3
3. IANA considerations . . . . . . . . . . . . . . . . . . . . . . 3
4. Security considerations . . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 4
6. Normative References . . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 5
Intellectual Property and Copyright Statements . . . . . . . . . . 6
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1. Introduction
Cryptographically Generated Address (CGA) specification [1] defines
Extension Fields that allow including additional information into 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 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
This document introduces a new Extension Type name space for use as
type tags when new Extensions are defined for CGAs. The values in
this name space are 8-bit unsigned integers. Values in this name
space are allocated according to the Standards Actions or IESG
approval policies defined in RFC2434 [2].
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This document does not define any new values in any name space.
4. Security considerations
No security concerns are raised by the adoption of the CGA Extension
format described in this document.
5. Acknowledgments
This document was reviewed by 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.
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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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