LISP Distinguished Name Encoding
draft-farinacci-lisp-name-encoding-11
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Dino Farinacci
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2020-11-14
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Network Working Group D. Farinacci
Internet-Draft lispers.net
Intended status: Experimental November 14, 2020
Expires: May 18, 2021
LISP Distinguished Name Encoding
draft-farinacci-lisp-name-encoding-11
Abstract
This draft defines how to use the AFI=17 Distinguished Names in LISP.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
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."
This Internet-Draft will expire on May 18, 2021.
Copyright Notice
Copyright (c) 2020 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
(https://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.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Definition of Terms . . . . . . . . . . . . . . . . . . . . . 3
3. Distinguished Name Format . . . . . . . . . . . . . . . . . . 3
4. Example Use-Cases . . . . . . . . . . . . . . . . . . . . . . 5
5. Name Collision Considerations . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . 5
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
8.1. Normative References . . . . . . . . . . . . . . . . . . 5
8.2. Informative References . . . . . . . . . . . . . . . . . 6
Appendix A. Acknowledgments . . . . . . . . . . . . . . . . . . 6
Appendix B. Document Change Log . . . . . . . . . . . . . . . . 6
B.1. Changes to draft-farinacci-lisp-name-encoding-11 . . . . 6
B.2. Changes to draft-farinacci-lisp-name-encoding-10 . . . . 7
B.3. Changes to draft-farinacci-lisp-name-encoding-09 . . . . 7
B.4. Changes to draft-farinacci-lisp-name-encoding-08 . . . . 7
B.5. Changes to draft-farinacci-lisp-name-encoding-07 . . . . 7
B.6. Changes to draft-farinacci-lisp-name-encoding-06 . . . . 7
B.7. Changes to draft-farinacci-lisp-name-encoding-05 . . . . 7
B.8. Changes to draft-farinacci-lisp-name-encoding-04 . . . . 7
B.9. Changes to draft-farinacci-lisp-name-encoding-03 . . . . 7
B.10. Changes to draft-farinacci-lisp-name-encoding-02 . . . . 8
B.11. Changes to draft-farinacci-lisp-name-encoding-01 . . . . 8
B.12. Changes to draft-farinacci-lisp-name-encoding-00 . . . . 8
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
The LISP architecture and protocols [RFC6830] introduces two new
numbering spaces, Endpoint Identifiers (EIDs) and Routing Locators
(RLOCs) which are intended to replace most use of IP addresses on the
Internet. To provide flexibility for current and future
applications, these values can be encoded in LISP control messages
using a general syntax that includes Address Family Identifier (AFI)
[RFC1700].
The length of the value field is implicit in the type of address that
follows. For AFI 17, a Distinguished Name can be encoded. A name
can be a variable length field so the length cannot be determined
solely from the AFI value 17. This draft defines a termination
character, an 8-bit value of 0 to be used as a string terminator so
the length can be determined.
LISP Distinguished Names are useful when encoded either in EID-
records or RLOC-records in LISP control messages. As EIDs, they can
be registered in the mapping system to find resources, services, or
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simply used as a self-documenting feature that accompany other
address specific EIDs. As RLOCs, Distinguished Names, along with
RLOC specific addresses and parameters, can be used as labels to
identify equipment type, location, or any self-documenting string a
registering device desires to convey.
2. Definition of Terms
Address Family Identifier (AFI): a term used to describe an address
encoding in a packet. An address family currently defined for
IPv4 or IPv6 addresses. See [AFI] and [RFC1700] for details on
other types of information that can be AFI encoded.
3. Distinguished Name Format
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An AFI=17 Distinguished Name is encoded as:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| AFI = 17 | ASCII String ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... ASCII String | 0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The string of characters are encoded in the ASCII character-set
definition [RFC0020].
When Distinguished Names are encoded for EIDs, the EID-prefix length
of the EIDs as they appear in EID-records for all LISP control
messages is the length of the string in bits (include the null 0
byte). Where Distinguished Names are encoded anywhere else (i.e.
nested in LCAF encodings), then any length field is the length of the
ASCII string including the null 0 byte in units of bytes.
When Map-Requests are sent for an EID encoded in Distinguished Name
format, an exact match request is performed. So the Map-Server (when
configured for proxy-Map-Replying) or the ETR will return a Map-Reply
with the same EID-prefix length.
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4. Example Use-Cases
This section identifies three specific use-cases for the
Distinguished Name format. Two are used for an EID encoding and one
for a RLOC-record encoding. When storing public keys in the mapping
system, as in [I-D.ietf-lisp-ecdsa-auth], a well known format for a
public-key hash can be encoded as a Distinguished Name. When street
location to GPS coordinate mappings exist in the mapping system, as
in [I-D.farinacci-lisp-geo], the street location can be a free form
ascii representation (with whitespace characters) encoded as a
Distinguished Name. An RLOC that describes an xTR behind a NAT
device can be identified by its router name, as in
[I-D.farinacci-lisp-simple-nat], uses a Distinguished Name encoding.
As well as identifying the router name (neither an EID or an RLOC) in
NAT Info-Request messages uses Distinguished Name encodings.
5. Name Collision Considerations
When a Distinguished Name encoding is used to format an EID, the
uniqueness and allocation concerns are no different than registering
IPv4 or IPv6 EIDs to the mapping system. See
[I-D.ietf-lisp-rfc6833bis] for more details. Also, the use-case
documents specified in Section 4 provide allocation recommendations
for their specific uses.
6. Security Considerations
There are no security considerations.
7. IANA Considerations
The code-point values in this specification are already allocated in
[AFI].
8. References
8.1. Normative References
[AFI] "Address Family Identifier (AFIs)", ADDRESS FAMILY
NUMBERS http://www.iana.org/numbers.html, Febuary 2007.
[I-D.ietf-lisp-rfc6833bis]
Farinacci, D., Maino, F., Fuller, V., and A. Cabellos-
Aparicio, "Locator/ID Separation Protocol (LISP) Control-
Plane", draft-ietf-lisp-rfc6833bis-29 (work in progress),
September 2020.
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[RFC0020] Cerf, V., "ASCII format for network interchange", STD 80,
RFC 20, DOI 10.17487/RFC0020, October 1969,
<https://www.rfc-editor.org/info/rfc20>.
[RFC1700] Reynolds, J. and J. Postel, "Assigned Numbers", RFC 1700,
DOI 10.17487/RFC1700, October 1994,
<https://www.rfc-editor.org/info/rfc1700>.
[RFC6830] Farinacci, D., Fuller, V., Meyer, D., and D. Lewis, "The
Locator/ID Separation Protocol (LISP)", RFC 6830,
DOI 10.17487/RFC6830, January 2013,
<https://www.rfc-editor.org/info/rfc6830>.
8.2. Informative References
[I-D.farinacci-lisp-geo]
Farinacci, D., "LISP Geo-Coordinate Use-Cases", draft-
farinacci-lisp-geo-10 (work in progress), October 2020.
[I-D.farinacci-lisp-simple-nat]
Farinacci, D., "A Simple LISP NAT-Traversal
Implementation", draft-farinacci-lisp-simple-nat-01 (work
in progress), November 2020.
[I-D.ietf-lisp-ecdsa-auth]
Farinacci, D. and E. Nordmark, "LISP Control-Plane ECDSA
Authentication and Authorization", draft-ietf-lisp-ecdsa-
auth-04 (work in progress), September 2020.
Appendix A. Acknowledgments
The author would like to thank the LISP WG for their review and
acceptance of this draft.
Appendix B. Document Change Log
B.1. Changes to draft-farinacci-lisp-name-encoding-11
o Submitted November 2020.
o Made changes to reflect working group comments.
o Update references and document expiry timer.
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B.2. Changes to draft-farinacci-lisp-name-encoding-10
o Submitted August 2020.
o Update references and document expiry timer.
B.3. Changes to draft-farinacci-lisp-name-encoding-09
o Submitted March 2020.
o Update references and document expiry timer.
B.4. Changes to draft-farinacci-lisp-name-encoding-08
o Submitted September 2019.
o Update references and document expiry timer.
B.5. Changes to draft-farinacci-lisp-name-encoding-07
o Submitted March 2019.
o Update referenes and document expiry timer.
B.6. Changes to draft-farinacci-lisp-name-encoding-06
o Submitted September 2018.
o Update document expiry timer.
B.7. Changes to draft-farinacci-lisp-name-encoding-05
o Submitted March 2018.
o Update document expiry timer.
B.8. Changes to draft-farinacci-lisp-name-encoding-04
o Submitted September 2017.
o Update document expiry timer.
B.9. Changes to draft-farinacci-lisp-name-encoding-03
o Submitted March 2017.
o Update document expiry timer.
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B.10. Changes to draft-farinacci-lisp-name-encoding-02
o Submitted October 2016.
o Add a comment that the distinguished-name encoding is restricted
to ASCII character encodings only.
B.11. Changes to draft-farinacci-lisp-name-encoding-01
o Submitted October 2016.
o Update document timer.
B.12. Changes to draft-farinacci-lisp-name-encoding-00
o Initial draft submitted April 2016.
Author's Address
Dino Farinacci
lispers.net
San Jose, CA
USA
Email: farinacci@gmail.com
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