Padding Chunk and Parameter for the Stream Control Transmission Protocol (SCTP)
draft-ietf-tsvwg-sctp-padding-02
The information below is for an old version of the document that is already published as an RFC.
| Document | Type |
This is an older version of an Internet-Draft that was ultimately published as RFC 4820.
|
|
|---|---|---|---|
| Authors | Peter Lei , Randall R. Stewart , Michael Tüxen | ||
| Last updated | 2020-07-29 (Latest revision 2006-10-17) | ||
| Replaces | draft-tuexen-tsvwg-sctp-padding | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
| Intended RFC status | Proposed Standard | ||
| Formats | |||
| Additional resources | Mailing list discussion | ||
| Stream | WG state | (None) | |
| Document shepherd | (None) | ||
| IESG | IESG state | Became RFC 4820 (Proposed Standard) | |
| Action Holders |
(None)
|
||
| Consensus boilerplate | Unknown | ||
| Telechat date | (None) | ||
| Responsible AD | Lars Eggert | ||
| Send notices to | (None) |
draft-ietf-tsvwg-sctp-padding-02
Network Working Group M. Tuexen
Internet-Draft Muenster Univ. of Applied Sciences
Intended status: Standards Track R. Stewart
Expires: April 19, 2007 P. Lei
Cisco Systems, Inc.
October 16, 2006
Padding Chunk and Parameter for SCTP
draft-ietf-tsvwg-sctp-padding-02.txt
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Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
This document defines a padding chunk and a padding parameter and
describes the required receiver side procedures. The padding chunk
is used to pad an SCTP packet to an arbitrary size. The padding
parameter is used to pad an SCTP INIT chunk to an arbitrary size.
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Internet-Draft Padding Chunk and Parameter for SCTP October 2006
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Padding Chunk (PAD) . . . . . . . . . . . . . . . . . . . . . . 3
4. Padding Parameter (PAD) . . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
5.1. A New Chunk Type . . . . . . . . . . . . . . . . . . . . . 5
5.2. A New Parameter Type . . . . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . . 5
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1. Normative References . . . . . . . . . . . . . . . . . . . 6
8.2. Informative References . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6
Intellectual Property and Copyright Statements . . . . . . . . . . 8
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Internet-Draft Padding Chunk and Parameter for SCTP October 2006
1. Introduction
This document defines a padding chunk and a padding parameter and
describes the required receiver side procedures. The padding chunk
is used to pad an SCTP packet to an arbitrary size. The padding
parameter is used to pad an SCTP INIT chunk to an arbitrary size.
The usage of the PAD chunk for path MTU discovery is described in
PMTU [3]. The inappropriate usage of the PAD parameter or PAD chunk
can result in wasted bandwidth.
2. Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL", when they appear in this document, are to be interpreted
as described in RFC2119 [1].
3. Padding Chunk (PAD)
This chunk is used to pad an SCTP packet. A PAD chunk can be used to
enlarge the packet by 4 to 65536 bytes in steps of 4 bytes. An SCTP
packet MAY contain multiple PAD chunks.
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 = 0x84 | Flags=0 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
\ Padding Data /
/ \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1
Type: 1 byte (unsigned integer)
This value MUST be set to 0x84 for all PAD-chunks.
Flags: 1 byte (unsigned integer)
This value SHOULD be set to zero on transmit and MUST be ignored
on receipt.
Length: 2 bytes (unsigned integer)
This value holds the length of the Padding Data plus 4.
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Internet-Draft Padding Chunk and Parameter for SCTP October 2006
Padding Data: n bytes (unsigned integer)
This holds the Padding Data. The Padding Data MUST be ignored by
the receiver.
The receiver of the PAD chunk MUST discard this chunk and continue
processing the rest of the chunks in the packet. Please note that
this is also the required processing behavior for any unknown chunk
having the same highest order two bits of the type as the PAD chunk.
4. Padding Parameter (PAD)
This parameter is used to pad an INIT chunk. A PAD parameter can be
used to enlarge the INIT chunk by 4 bytes as the minimum to the
maximum size of the INIT chunk in steps of 4 bytes. An INIT chunk
MAY contain multiple PAD parameters.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Parameter Type = 0x8005 | Parameter Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
/ /
\ Padding Data \
/ /
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2
Parameter Type: 2 bytes (unsigned integer)
This value MUST be set to 0x8005.
Parameter Length: 2 bytes (unsigned integer)
This value holds the length of the Padding Data plus 4.
The PAD parameter MAY be included only in the INIT chunk. It MUST
NOT be included in any other chunk. The receiver of the PAD
parameter MUST silently discard this parameter and continue
processing the rest of the INIT chunk. This means that the size of
the generated COOKIE parameter in the INIT-ACK MUST NOT depend on the
existence of the PAD parameter in the INIT chunk. A receiver of a
PAD parameter MUST NOT include the PAD parameter within any State
Cookie parameter it generates.
5. IANA Considerations
[NOTE to RFC-Editor:
Tuexen, et al. Expires April 19, 2007 [Page 4]
Internet-Draft Padding Chunk and Parameter for SCTP October 2006
"RFCXXXX" is to be replaced by the RFC number you assign this
document.
]
This document (RFCXXX) is the reference for all registrations
described in this section. All registrations need to be listed in
the document available at sctp-parameters [4]. The suggested changes
are described below.
5.1. A New Chunk Type
A chunk type for the PAD chunk has to be assigned by IANA. It is
suggested to use the value given in Figure 1. This requires an
additional line in the "CHUNK TYPES" table of sctp-parameters [4]:
CHUNK TYPES
ID Value Chunk Type Reference
-------- ---------- ---------
132(0x84) Padding Chunk (PAD) [RFCXXXX]
5.2. A New Parameter Type
A parameter type has to be assigned for the PAD parameter by IANA.
It is suggested to use the values given in Figure 2. This requires a
modification in the "CHUNK PARAMETER TYPES" table in sctp-
parameters [4]: Add a new line to the "INIT Chunk Parameter Types"
table:
Chunk Parameter Type Value
-------------------- -----
Padding 32773(0x8005)
6. Security Considerations
This document does not add any additional security considerations in
addition to the ones given in RFC2960 [2].
7. Acknowledgments
The authors wish to thank Matthew J. Zekauskas, and Lars Eggert for
his invaluable comments.
8. References
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8.1. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[2] Stewart, R., Xie, Q., Morneault, K., Sharp, C., Schwarzbauer,
H., Taylor, T., Rytina, I., Kalla, M., Zhang, L., and V. Paxson,
"Stream Control Transmission Protocol", RFC 2960, October 2000.
8.2. Informative References
[3] Mathis, M. and J. Heffner, "Packetization Layer Path MTU
Discovery", draft-ietf-pmtud-method-10 (work in progress),
September 2006.
URIs
[4] <http://www.iana.org/assignments/sctp-parameters>
Authors' Addresses
Michael Tuexen
Muenster Univ. of Applied Sciences
Stegerwaldstr. 39
48565 Steinfurt
Germany
Email: tuexen@fh-muenster.de
Randall R. Stewart
Cisco Systems, Inc.
4875 Forest Drive
Suite 200
Columbia, SC 29206
USA
Email: rrs@cisco.com
Tuexen, et al. Expires April 19, 2007 [Page 6]
Internet-Draft Padding Chunk and Parameter for SCTP October 2006
Peter Lei
Cisco Systems, Inc.
955 Happfield Dr.
Arlington Heights, IL 60004
US
Phone: +1 773 695-8201
Email: peterlei@cisco.com
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Internet-Draft Padding Chunk and Parameter for SCTP October 2006
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