Network Working Group M. Tuexen
Internet-Draft Muenster Univ. of Applied Sciences
Intended status: Standards Track R. Stewart
Expires: March 29, 2007 P. Lei
Cisco Systems, Inc.
September 25, 2006
Padding Chunk and Parameter for SCTP
draft-ietf-tsvwg-sctp-padding-01.txt
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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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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. Normative References . . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6
Intellectual Property and Copyright Statements . . . . . . . . . . 7
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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 PAD chunk can be used for path MTU discovery.
2. Conventions
The keywords "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 to an arbitrary size.
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)
Set to zero on transmit and ignored on receipt.
Length: 2 bytes (unsigned integer)
This value holds the length of the Padding Data plus 4.
Padding Data: n bytes (unsigned integer)
This holds the Padding Data. The Padding Data is 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
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this is also the required processing behavior for the PAD chunk when
it is unknown by the receiver.
4. Padding Parameter (PAD)
This parameter is used to pad an INIT chunk to an arbitrary size.
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:
"RFCXXXX" is to be replaced by the RFC number you assign this
document.
The reference to sctp-parameters [3] should be removed from the
"Normative References" section after the IANA section has been
removed.
]
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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 [3]. 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 [3]:
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 [3]: 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 for his invaluable
comments.
8. 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,
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Internet-Draft Padding Chunk and Parameter for SCTP September 2006
H., Taylor, T., Rytina, I., Kalla, M., Zhang, L., and V. Paxson,
"Stream Control Transmission Protocol", RFC 2960, October 2000.
[3] <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
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 September 2006
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