Network Working Group M. Tuexen
Internet-Draft Muenster Univ. of Applied Sciences
Updates: 4960 (if approved) R. Stewart
Intended status: Standards Track Huawei
Expires: September 2, 2010 March 1, 2010
Stream Control Transmission Protocol Chunk Flags Registration
draft-tuexen-tsvwg-sctp-chunk-flags-00.txt
Abstract
The current definition of the Stream Control Transmission Protocol
(SCTP) is missing a procedure for registering chunk flags for already
defined chunk types. This document defines this procedure. It does
not change SCTP in any other way.
Status of this Memo
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document authors. All rights reserved.
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Provisions Relating to IETF Documents
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Updated IETF Chunk Extension . . . . . . . . . . . . . . . 3
3.2. New IETF Chunk Flags Registration . . . . . . . . . . . . . 4
3.3. Initial Registrations . . . . . . . . . . . . . . . . . . . 4
3.3.1. DATA Chunk Flags . . . . . . . . . . . . . . . . . . . 4
3.3.2. INIT Chunk Flags . . . . . . . . . . . . . . . . . . . 4
3.3.3. INIT ACK Chunk Flags . . . . . . . . . . . . . . . . . 5
3.3.4. SACK Chunk Flags . . . . . . . . . . . . . . . . . . . 5
3.3.5. HEARTBEAT Chunk Flags . . . . . . . . . . . . . . . . . 5
3.3.6. HEARTBEAT ACK Chunk Flags . . . . . . . . . . . . . . . 5
3.3.7. ABORT Chunk Flags . . . . . . . . . . . . . . . . . . . 5
3.3.8. SHUTDOWN Chunk Flags . . . . . . . . . . . . . . . . . 5
3.3.9. SHUTDOWN ACK Chunk Flags . . . . . . . . . . . . . . . 5
3.3.10. ERROR Chunk Flags . . . . . . . . . . . . . . . . . . . 6
3.3.11. COOKIE ECHO Chunk Flags . . . . . . . . . . . . . . . . 6
3.3.12. COOKIE ACK Chunk Flags . . . . . . . . . . . . . . . . 6
3.3.13. ECNE Chunk Flags . . . . . . . . . . . . . . . . . . . 6
3.3.14. CWR Chunk Flags . . . . . . . . . . . . . . . . . . . . 6
3.3.15. SHUTDOWN COMPLETE Chunk Flags . . . . . . . . . . . . . 6
3.3.16. AUTH Chunk Flags . . . . . . . . . . . . . . . . . . . 6
3.3.17. ASCONF ACK Chunk Flags . . . . . . . . . . . . . . . . 7
3.3.18. PAD Chunk Flags . . . . . . . . . . . . . . . . . . . . 7
3.3.19. FORWARD TSN Chunk Flags . . . . . . . . . . . . . . . . 7
3.3.20. ASCONF Chunk Flags . . . . . . . . . . . . . . . . . . 7
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 7
5. Normative References . . . . . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 7
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1. Introduction
[RFC4960], which currently defines the Stream Control Transmission
Protocol (SCTP), provides a procedure to define new chunk types.
However, several protocol extensions currently being discussed need
to define new chunk flags for existing chunks. The only way to do
this is to obsolete [RFC4960], which is not appropriate.
This document overcomes this limitation and provides the procedure to
register chunk flags for existing chunk types. The protocol is not
changed in any other way. Therefore only Section 14.1 of [RFC4960]
is affected.
2. Conventions
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 [RFC2119].
3. IANA Considerations
Section 3.1 describes the updated procedure for chunk type
registration and replaces Section 14.1 of [RFC4960]. Section 3.2
defines the new procedure for chunk flag registration.
The initial values of the tables for the chunk flags for already
defined chunk types is given in Section 3.3.
3.1. Updated IETF Chunk Extension
The assignment of new chunk parameter type codes is done through an
IETF Review action, as defined in [RFC5226]. Documentation of a new
chunk MUST contain the following information:
a) A long and short name for the new chunk type;
b) A detailed description of the structure of the chunk, which MUST
conform to the basic structure defined in section 3.2 of
[RFC4960];
c) A detailed definition and description of intended use of each
field within the chunk, including the chunk flags if any.
Defined chunk flags will be used as initial entries in the chunk
flags table for the new chunk type;
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d) A detailed procedural description of the use of the new chunk
type within the operation of the protocol.
The last chunk type (255) is reserved for future extension if
necessary.
IANA creates for each new chunk type a registration table for the
chunk flags for this type. The procedure for registering particular
chunk flags is described in the following Section 3.2.
3.2. New IETF Chunk Flags Registration
The assignment of new chunk flags is done through an RFC required
action, as defined in [RFC5226]. Documentation of the chunk flags
MUST contain the following information:
a) A name for the new chunk flag;
b) A detailed procedural description of the use of the new chunk
flag within the operation of the protocol. It MUST be considered
that implementations not supporting the flag will just ignore it.
IANA selects a chunk flags value, exactly one of 0x01, 0x02, 0x04,
0x08, 0x10, 0x20, 0x40, or 0x80, which MUST be unique within the
chunk flag values for the specific chunk type.
3.3. Initial Registrations
This section describes the initially defined chunk flag tables, one
table per chunk. Most of the tables are currently empty.
3.3.1. DATA Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
| 0x01 | E bit | [RFC4960] |
| 0x02 | B bit | [RFC4960] |
| 0x04 | U bit | [RFC4960] |
+------------------+-----------------+-----------+
3.3.2. INIT Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
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3.3.3. INIT ACK Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.4. SACK Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.5. HEARTBEAT Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.6. HEARTBEAT ACK Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.7. ABORT Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
| 0x01 | T bit | [RFC4960] |
+------------------+-----------------+-----------+
3.3.8. SHUTDOWN Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.9. SHUTDOWN ACK Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
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3.3.10. ERROR Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.11. COOKIE ECHO Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.12. COOKIE ACK Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.13. ECNE Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.14. CWR Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.15. SHUTDOWN COMPLETE Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
| 0x01 | T bit | [RFC4960] |
+------------------+-----------------+-----------+
3.3.16. AUTH Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
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3.3.17. ASCONF ACK Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.18. PAD Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.19. FORWARD TSN Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
3.3.20. ASCONF Chunk Flags
+------------------+-----------------+-----------+
| Chunk Flag Value | Chunk Flag Name | Reference |
+------------------+-----------------+-----------+
4. Security Considerations
This document does not add any additional security considerations in
addition to the ones given in [RFC4960].
5. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC4960] Stewart, R., "Stream Control Transmission Protocol",
RFC 4960, September 2007.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
May 2008.
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Authors' Addresses
Michael Tuexen
Muenster Univ. of Applied Sciences
Stegerwaldstr. 39
48565 Steinfurt
Germany
Email: tuexen@fh-muenster.de
Randall R. Stewart
Huawei
Chapin, SC 29036
USA
Email: rstewart@huawei.com
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