Network Working Group J. Kempf

Network Working Group J. Kempf
Request for Comments: 4065 DoCoMo Labs USA
Category: Experimental July 2005

Instructions for Seamoby and
Experimental Mobility Protocol IANA Allocations

Status of This Memo

This memo defines an Experimental Protocol for the Internet
community. It does not specify an Internet standard of any kind.
Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2005).

Abstract

The Seamoby Candidate Access Router Discovery (CARD) protocol and the
Context Transfer Protocol (CXTP) are experimental protocols designed
to accelerate IP handover between wireless access routers. These
protocols require IANA allocations for ICMP type and options, Stream
Control Transmission Protocol (SCTP) Payload Protocol Identifiers,
port numbers, and registries for certain formatted message options.
This document contains instructions to IANA about which allocations
are required for the Seamoby protocols. The ICMP subtype extension
format for Seamoby has been additionally designed so that it can be
utilized by other experimental mobility protocols, and the SCTP port
number is also available for other experimental mobility protocols.

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Table of Contents

1. Introduction.................................................. 2
2. Common IPv4 and IPv6 Allocations.............................. 2
3. IPv4 Allocations.............................................. 3
4. IPv6 Allocations.............................................. 3
5. Candidate Access Router Discovery Protocol Registries......... 3
6. Context Transfer Profile Type Registry........................ 5
7. Context Transfer Protocol Authorization Token Calculation
Algorithm..................................................... 5
8. ICMP Experimental Mobility Subtype Format and Registry........ 5
9. Utilization by Other Experimental Mobility Protocols.......... 6
10. Normative References.......................................... 6
11. Security Considerations....................................... 7
12. IANA Considerations........................................... 7

1. Introduction

The Seamoby Candidate Access Router Discovery (CARD) protocol
[RFC4066] and the Context Transfer Protocol (CXTP) [RFC4067] are
experimental protocols designed to accelerate IP handover between
wireless access routers. These protocols require IANA allocations
for ICMP options and type, SCTP Payload Protocol Identifiers, port
numbers, and the establishment of registries for certain formatted
message options. Because the protocols are experimental, there is no
guarantee that they will ever see widespread deployment in their
current form. Consequently, it is prudent to conserve Internet
numbering resources that might be needed for other protocols that
could see wider deployment. This document contains instructions to
IANA for the Seamoby protocols. Additionally, the ICMP subtype
extension format has been designed so that it could be used by other
experimental mobility protocols.

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 RFC 2119 [RFC2119].
Allocation policy names Specification Required, IETF Consensus
Action, and Designated Expert are to be interpreted as described in
RFC 2434 [RFC2434].

2. Common IPv4 and IPv6 Allocations

IANA has assigned SCTP port numbers 5090 for use by [RFC4066] and
5091 for use of [RFC4067]. See Section 5.2.1 of [RFC4066] for a
description of the inter-access router CARD protocol use of SCTP, and
Section 3.1 of [RFC4067] for a description of the inter-access router
CXTP use of SCTP.

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3. IPv4 Allocations

IANA has assigned ICMP type 41 for IPv4 identifying ICMP messages
utilized by experimental mobility protocols such as Seamoby. See
Section 5.1.1 of [RFC4066] for a description of experimental mobility
CARD ICMP messages and Section 3.2 of [RFC4067] for the CXTP ICMP
messages, specified by Seamoby. See Section 9 of this document for a
description of the experimental mobility protocol ICMP subtype format
and initial allocations.

IANA has assigned Mobile IPv4 Foreign Agent Discovery [RFC3344]
option type codes for the following:

Code Purpose Reference
---------------------------------------------------------------------
137 CARD MN-AR signature option Section 6.4 of [RFC4066]
138 CARD Request option Section 5.1.2.1 of [RFC4066]
139 CARD Reply option Section 5.1.2.2 of [RFC4066]

4. IPv6 Allocations

IANA has assigned ICMP type code 150 for IPv6 identifying ICMP
messages utilized by experimental mobility protocols such as Seamoby.
See Section 5.1.1 of [RFC4066] for a description of experimental
mobility CARD ICMP messages and Section 3.2 of [RFC4067] for the CXTP
ICMP messages, specified by Seamoby. See Section 9 of this document
for a description of the experimental mobility protocol subtype
format and initial allocations.

IANA has assigned IPv6 RFC 2461 Neighbor Discovery [RFC2461] option
type codes for the following:

Code Purpose Reference
----------------------------------------------------------------
138 CARD Request option Section 5.1.2.1 of [RFC4066]
139 CARD Reply option Section 5.1.2.2 of [RFC4066]

5. Candidate Access Router Discovery Protocol Registries

For CARD, two new registries are created that IANA is to maintain,
named:

1) The AVP Type Registry,
2) The Layer 2 Access Technology Identifier Registry.

These are described in the following subsections.

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5.1. AVP Type Registry

The AVP Type Registry allows for future expansion of the CARD AVP
type space to include new AVPs. AVP Type codes are 16 bit unsigned
integers. See Section 5.1.4 of [RFC4066] for a description of AVPs.

The registry SHALL be initially populated with the following table:

AVP Name Type Code
----------------------------------------------
RESERVED 0x00

Future allocations of AVP type codes will be made through Expert
Review, as defined in RFC 2434.

5.2. Layer 2 Access Technology Identifier Registry

The Layer 2 Access Technology Identifier registry allows the
registration of type codes to uniquely identify specific access
technologies in the L2-Type field of the CARD L2 ID sub-option. L2
ID codes are 16 bit unsigned integers. See Section 5.1.3.1 of
[RFC4066] for a description of the CARD L2 ID sub-option.

The registry SHALL initially be populated with the following table:

Layer 2 Access Technology Type Code
----------------------------------------------
RESERVED 0x00
IEEE 802.3 (Ethernet) 0x01
IEEE 802.11a 0x02
IEEE 802.11b 0x03
IEEE 802.11g 0x04
IEEE 802.15.1(Bluetooth) 0x05
IEEE 802.15.3 0x06
IEEE 802.15.4 0x07
IEEE 802.16 0x08

Future allocation of Layer 2 Access Technology identifiers will be
made by the method of Specification Required, as defined in RFC 2434.
All requests for allocations MUST be accompanied by a reference to a
technical document in which the design of the Layer 2 access
technology is described.

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6. Context Transfer Profile Type Registry

CXTP requires IANA to maintain a registry named the Context Transfer
Profile Type Registry, which is a registry of context Feature Profile
Type identifiers. Feature Profile Type identifiers are 16 bit
unsigned integers that identify particular types of feature contexts.
See Section 2.4 of [RFC4067] for a description of how contexts are
carried in CXTP.

The registry SHALL initially be populated with the following table:

Context Profile Type Code
----------------------------------------------
RESERVED 0x00
IPv6 Multicast Listener Context 0x01

Future allocations of Feature Profile Type codes will be made through
Expert Review, as defined in RFC 2434.

7. Context Transfer Protocol Authorization Token Calculation Algorithm

In Section 2.5.4 of [RFC4067], CXTP requires an authorization token
calculation algorithm indicator. Currently, the only indicator
defined is 0x1, for HMAC_SHA1. Additional algorithms may be added by
the method of Specification Required [RFC2434].

8. ICMP Experimental Mobility Subtype Format and Registry

The ICMP Experimental Mobility Type is utilized by CARD and CXTP in
the following way. The interpretation of the Code field is as
defined by the relevant ICMP standard for IPv4 and IPv6, and does not
change. The protocols are free to utilize the Code for their own
purposes. The ICMP Experimental Mobility Type defines a one octet
subtype field within the ICMP Reserved field that identifies the
specific protocol. The ICMP header for the Experimental Mobility
Type is:

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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Code | Checksum |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Subtype | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Options...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-

Type For IPv4, 41; for IPv6 150

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Code As defined by the relevant ICMP specification and
free for use by the Experimental Mobility protocol.

Checksum ICMP checksum

Subtype One octet subtype code identifying the Experimental
Mobility protocol

Reserved Unless otherwise defined by the Experimental Mobility
protocol, set to zero by the sender and ignored by
the receiver.

Options As defined by the Experimental Mobility protocol.

IANA SHALL maintain a registry of one octet unsigned integer subtype
codes for the Experimental Mobility protocols called the Experimental
Mobility Protocol Subtype Registry.

Initial allocations in the registry SHALL be established as follows:

Protocol/Message Subtype Reference
----------------------------------------------------------
CARD 0 Section 5.1.1 of [RFC4066]
CXTP 1 Section 3.2 of [RFC4067]

Subsequent allocations of subtype codes SHALL be made by the method
of Specification Required and IESG Review as defined in RFC 2434.

9. Usage by Other Experimental Mobility Protocols

The ICMP Experimental Mobility type code is available for other
experimental mobility protocols to use. Other experimental mobility
protocols MAY define additional ICMP messages that use code points
under the Experimental Mobility ICMP type.

10. Normative References

[RFC2434] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 2434,
October 1998.

[RFC2461] Narten, T., Nordmark, E., and W. Simpson, "Neighbor
Discovery for IP Version 6 (IPv6)", RFC 2461, December
1998.

[RFC3344] Perkins, C., "IP Mobility Support for IPv4", RFC 3344,
August 2002.

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[RFC4066] Liebsch, M., Ed., Singh, A., Ed., Chaskar, H., Funato, D.,
and E. Shim, "Candidate Access Router Discovery (CARD)",
RFC 4066, July 2005.

[RFC4067] Loughney, J., Ed., Nahkjiri, M., Perkins, C., and R.
Koodli, "Context Transfer Protocol", RFC 4067, July 2005.

11. Security Considerations

There are no security considerations associated with this document.

12. IANA Considerations

This entire document is about IANA considerations.

Author's Address

James Kempf
DoCoMo Labs USA
181 Metro Drive
Suite 300
San Jose, CA
95110

Phone: +1 408 451 4711
EMail: [email protected]

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Full Copyright Statement

Copyright (C) The Internet Society (2005).

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Acknowledgement

Funding for the RFC Editor function is currently provided by the
Internet Society.

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