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Internet Engineering Task Force (IETF)                          J. Arkko
Request for Comments: 5872                                      Ericsson
Updates: 5191                                                   A. Yegin
Category: Standards Track                                        Samsung
ISSN: 2070-1721                                                 May 2010

                           IANA Rules for the
     Protocol for Carrying Authentication for Network Access (PANA)

Abstract

   This document relaxes the IANA rules for the Protocol for Carrying
   Authentication for Network Access (PANA).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/RFC 5872.

Copyright Notice

   Copyright (c) 2010 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
   (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.

Arkko & Yegin                Standards Track                    [Page 1]
RFC 5872 PANA IANA Rules May 2010 1. Introduction This document relaxes the IANA rules for the Protocol for Carrying Authentication for Network Access (PANA) [RFC 5191]. Rules for the following protocol fields, all defined in [RFC 5191], are affected: o Message Types o Message Flags o Attribute-Value Pair (AVP) Flags o Result-Code AVP Values o Termination-Cause AVP Values The rationale for this update is that there can be situations in which it makes sense to grant an allocation under special circumstances. At the time of this writing, the IETF is in the process of approving one such allocation. By changing the current IANA rules to allow for IESG Approval [RFC 5226] as well, it has become possible for the Internet Engineering Steering Group (IESG) to consider an allocation request, even if it does not fulfill the default rule. For instance, an experimental protocol extension could perhaps deserve an allocation from a field of reserved bits, as long as a sufficient number of bits still remain for other purposes, and the PANA community is happy with such allocation. 2. IANA Considerations IANA has updated the registries related to PANA Message Types, Message Flags, AVP Flags, Result-Code AVP Values, and Termination- Cause AVP Values, as specified below. All other PANA IANA registries are to remain unchanged. 2.1. Message Types The Message Types namespace is used to identify PANA messages. Value 0 is not used and is not assigned by IANA. The range of values from 1 - 65,519 are for permanent, standard Message Types, allocated by IETF Review or IESG Approval [RFC 5226]. Previously, the rule for this range was allocation by IETF Review only. [RFC 5191] defined the range of values from 1 - 4. The same Message Type is used for both the request and the answer messages, except for type 1. The Request bit distinguishes requests from answers. Arkko & Yegin Standards Track [Page 2]
RFC 5872 PANA IANA Rules May 2010 The range of values from 65,520 - 65,535 (hexadecimal values 0xfff0 - 0xffff) is reserved for experimental messages. As these codes are only for experimental and testing purposes, no guarantee is made for interoperability between the communicating PANA Client (PaC) and PANA Authentication Agent (PAA) using experimental commands, as outlined in [RFC 3692]. 2.2. Message Flags There are 16 bits in the Flags field of the PANA message header. Section 6.2 of [RFC 5191] assigned bit 0 ('R'), 1 ('S'), 2 ('C'), 3 ('A'), 4 ('P'), and 5 ('I'). Allocations from the remaining free bits in the PANA header Flag field are made via Standards Action or IESG Approval [RFC 5226]. Previously, the rule for these bits was allocation by Standards Action only. 2.3. AVP Flags There are 16 bits in the AVP Flags field of the AVP header, defined in Section 6.3 of [RFC 5191]. That RFC also assigned bit 0 ('V'). The remaining bits are assigned via Standards Action or IESG Approval [RFC 5226]. Previously, the rule for these bits was allocation by Standards Action only. 2.4. Result-Code AVP Values As defined in Section 8.7 of [RFC 5191], the Result-Code AVP (AVP Code 7) defines the values from 0 - 2. All remaining values are available for assignment via IETF Review or IESG Approval [RFC 5226]. Previously, the rule for these values was allocation by IETF Review only. 2.5. Termination-Cause AVP Values As defined in Section 8.9 of [RFC 5191], the Termination-Cause AVP (AVP Code 9) defines the values 1, 4, and 8. All remaining values are available for assignment via IETF Review or IESG Approval [RFC 5226]. Previously, the rule for these values was allocation by IETF Review only. Arkko & Yegin Standards Track [Page 3]
RFC 5872 PANA IANA Rules May 2010 3. Security Considerations This specification does not change the security properties of PANA. However, a few words are necessary about the use of the experimental code points defined in Section 2.1. Potentially harmful side effects from the use of the experimental values need to be carefully evaluated before deploying any experiment across networks that the owner of the experiment does not entirely control. Guidance given in [RFC 3692] about the use of experimental values needs to be followed. 4. References 4.1. Normative References [RFC 5191] Forsberg, D., Ohba, Y., Patil, B., Tschofenig, H., and A. Yegin, "Protocol for Carrying Authentication for Network Access (PANA)", RFC 5191, May 2008. [RFC 5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 5226, May 2008. 4.2. Informative References [RFC 3692] Narten, T., "Assigning Experimental and Testing Numbers Considered Useful", BCP 82, RFC 3692, January 2004. Arkko & Yegin Standards Track [Page 4]
RFC 5872 PANA IANA Rules May 2010 Appendix A. Changes from RFC 5191 This document changes the IANA rules for: Message Types, Message Flags, AVP Flags, Result-Code AVP Values, and Termination-Cause AVP Values. Appendix B. Acknowledgments The authors would like to thank Yoshihiro Ohba, Ralph Droms, Magnus Westerlund, and Alfred Hoenes for reviews and comments on this topic. Authors' Addresses Jari Arkko Ericsson Jorvas 02420 Finland EMail: jari.arkko@piuha.net Alper Yegin Samsung Istanbul Turkey EMail: alper.yegin@yegin.org Arkko & Yegin Standards Track [Page 5]