Internet DRAFT - draft-templin-6man-crh-variable
draft-templin-6man-crh-variable
Network Working Group F. Templin, Ed.
Internet-Draft The Boeing Company
Intended status: Standards Track May 18, 2020
Expires: November 19, 2020
IPv6 Compressed Routing Header with Variable Length Addresses
draft-templin-6man-crh-variable-00
Abstract
The IPv6 Routing Header can be used to direct a packet through
multiple intermediate IPv6 waypoints toward a final destination. In
its simplest form, the routing header includes the full length of
each intermediate IPv6 waypoint. This document specifies a method
for supporting variable-length compressed IPv6 addresses.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Requirements . . . . . . . . . . . . . . . . . . . . . . . . 2
4. IPv6 Compressed Routing Header with Variable Length Addresses 2
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
6. Security Considerations . . . . . . . . . . . . . . . . . . . 4
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
8.1. Normative References . . . . . . . . . . . . . . . . . . 4
8.2. Informative References . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
The IPv6 Routing Header [RFC8200] can be used to direct a packet
through multiple intermediate IPv6 waypoints toward a final
destination. In its simplest form, the routing header includes the
full length of each intermediate IPv6 waypoint. This document
specifies a method for supporting variable-length compressed IPv6
addresses.
2. Terminology
The terminology in the normative references applies.
3. Requirements
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119][RFC8174] when, and only when, they appear in all
capitals, as shown here.
4. IPv6 Compressed Routing Header with Variable Length Addresses
An IPv6 Compressed Routing Header with Variable length addreses is
shown in Figure 1:
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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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Next Header | Hdr Ext Len | Routing Type | Segments Left |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|T|RSV| Len[0] | IPv6 Address[0] (0 to 31 bytes) .....
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
|T|RSV| Len[1] | IPv6 Address[1] (0 to 31 bytes) .....
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
|T|RSV| Len[2] | IPv6 Address[2] (0 to 31 bytes) .....
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
|T|RSV| Len[N] | IPv6 Address[N] [0 to 31 bytes) .....
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
Figure 1: IPv6 Compressed Routing Header with Variable Length
Addresses
In this format:
o Next Header, Hdr Ext Len, Routing Type and Segments Left have the
same meaning as for other compressed routing header formats.
o Immediately following are a set of N type/length/value segments as
follows:
*
* T indicates whether the following IPv6 Address is compressed on
the left-side (most significant bits compressed) or right-side
(least significant bits compressed).
* RSV field is reserved for future use.
* Len[i] indicates how many contiguous bytes of the left/right
compressed IPv6 address follow. Len[i] is a 5-bit field to
allow for the case that an IPv6 address is accompanied by an
additional piece of information, e.g., a transport port number.
* IPv6 Address[i] is 0 to 31 bits in length, with either left-
side or right-side compression applied.
Note that a similar format appears in [RFC8138].
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5. IANA Considerations
The IANA is instructed to allocate a routing header type value.
6. Security Considerations
Security considerattions are the same as for other compressed routing
header types.
7. Acknowledgements
TBD
8. References
8.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8200] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", STD 86, RFC 8200,
DOI 10.17487/RFC8200, July 2017,
<https://www.rfc-editor.org/info/rfc8200>.
8.2. Informative References
[RFC8138] Thubert, P., Ed., Bormann, C., Toutain, L., and R. Cragie,
"IPv6 over Low-Power Wireless Personal Area Network
(6LoWPAN) Routing Header", RFC 8138, DOI 10.17487/RFC8138,
April 2017, <https://www.rfc-editor.org/info/rfc8138>.
Author's Address
Fred L. Templin (editor)
The Boeing Company
P.O. Box 3707
Seattle, WA 98124
USA
Email: fltemplin@acm.org
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