Network Working Group M. Bagnulo Internet-Draft UC3M Updates: 3972 (if approved) J. Arkko Expires: April 17, 2006 Ericsson October 14, 2005 Cryptographically Generated Addresses (CGA) Extension Field Format draft-bagnulo-shim6-cga-ext-00 Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on April 17, 2006. Copyright Notice Copyright (C) The Internet Society (2005). Abstract This document define a Type-Length-Value format for Cryptographically Generated Address (CGA) Extensions. Bagnulo & Arkko Expires April 17, 2006 [Page 1] Internet-Draft CGA Extension Field Format October 2005 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. CGA Extension Field Format . . . . . . . . . . . . . . . . . . 3 3. IANA considerations . . . . . . . . . . . . . . . . . . . . . . 3 4. Security considerations . . . . . . . . . . . . . . . . . . . . 3 5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 4 6. Normative References . . . . . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 5 Intellectual Property and Copyright Statements . . . . . . . . . . 6 Bagnulo & Arkko Expires April 17, 2006 [Page 2] Internet-Draft CGA Extension Field Format October 2005 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: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- - - - - - - - - | Extension Type| Extension Data Length | Extension Data +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- - - - - - - - - Extension Type: 8-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]. This document does not define any new values in any name space. 4. Security considerations Bagnulo & Arkko Expires April 17, 2006 [Page 3] Internet-Draft CGA Extension Field Format October 2005 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 and Stefan Rommer. 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. Bagnulo & Arkko Expires April 17, 2006 [Page 4] Internet-Draft CGA Extension Field Format October 2005 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 Bagnulo & Arkko Expires April 17, 2006 [Page 5] Internet-Draft CGA Extension Field Format October 2005 Intellectual Property Statement The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. 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Disclaimer of Validity This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Copyright Statement Copyright (C) The Internet Society (2005). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Bagnulo & Arkko Expires April 17, 2006 [Page 6]