Internet DRAFT - draft-dreibholz-tsvwg-sctpsocket-sqinfo
draft-dreibholz-tsvwg-sctpsocket-sqinfo
Network Working Group T. Dreibholz
Internet-Draft SimulaMet
Intended status: Experimental R. Seggelmann
Expires: 29 March 2024 Münster Univ. of App. Sciences
M. Becke
HAW Hamburg
26 September 2023
Sender Queue Info Option for the SCTP Socket API
draft-dreibholz-tsvwg-sctpsocket-sqinfo-27
Abstract
This document describes an extension to the SCTP sockets API for
querying information about the sender queue.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on 29 March 2024.
Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Sender Queue Info (SCTP_SQINFO) . . . . . . . . . . . . . . . 2
4. Testbed Platform . . . . . . . . . . . . . . . . . . . . . . 3
5. Security Considerations . . . . . . . . . . . . . . . . . . . 3
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 4
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
8.1. Normative References . . . . . . . . . . . . . . . . . . 4
8.2. Informative References . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
This draft describes an extension to the SCTP sockets API (see [4],
[6] [3]) which allows an application to query the sender queue
utilization per stream. This information is necessary for
applications to make efficient use of a mapping of streams to
dissimilar paths. A detailed description including simulation
results can be found in [7].
In particular, this API extension is useful when using the CMT-SCTP,
CMT/RPv1-SCTP, CMT/RPv2-SCTP and MPTCP-like extensions (see [5],
[13], [12], [9], [10], [11], [8]) for Concurrent Multipath Transfer
(CMT) with SCTP.
2. Conventions
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 [1] [2] when, and only when, they appear in all capitals, as shown
here.
3. Sender Queue Info (SCTP_SQINFO)
This socket option obtains the maximum sender queue size (in bytes),
the current total sender queue utilization (in bytes) as well as the
current utilization per stream (in bytes).
The following structure is used to obtain the sender queue
information:
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struct sctp_sndqueueinfo {
sctp_assoc_t sq_assoc_id;
uint32_t sq_queue_limit;
uint32_t sq_total_queued;
uint32_t sq_number_of_streams;
uint32_t sq_queued_on_stream[];
};
sq_assoc_id: This parameter is ignored for one-to-one style sockets.
For one-to-many style sockets this parameter indicates which
association the user is performing an action upon. It is an error
to use SCTP_{CURRENT|ALL}_ASSOC in sq_assoc_id.
sq_queue_limit: This field gives the maximum sender queue size in
bytes.
sq_total_queued: This field gives the current total sender queue
utilization in bytes.
sq_number_of_streams: This field gives the number of outgoing
streams. That is, it will contain the number of valid
sq_queued_on_stream entries.
sq_queued_on_stream: This array gives the current number of bytes
queued for the streams 0 to sq_number_of_streams-1.
Note, that the caller of getsockopt() MUST provide a
sctp_sndqueueinfo structure which can hold at least as many
sq_queued_on_stream entries as the association's number of outgoing
streams. Otherwise, the getsockopt() call will fail and return an
error.
4. Testbed Platform
A large-scale and realistic Internet testbed platform with support
for the multi-homing feature of the underlying SCTP protocol is
NorNet. A description of NorNet is provided in [14], [15], some
further information can be found on the project website [16].
5. Security Considerations
Security considerations for the SCTP sockets API are described by
[4].
6. IANA Considerations
This document does not require IANA actions.
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7. Acknowledgments
The authors would like to thank Michael Tuexen and Irene Ruengeler
for their support.
8. References
8.1. Normative References
[1] 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>.
[2] 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>.
[3] Stewart, R., Ed., "Stream Control Transmission Protocol",
RFC 4960, DOI 10.17487/RFC4960, September 2007,
<https://www.rfc-editor.org/info/rfc4960>.
[4] Stewart, R., Tuexen, M., Poon, K., Lei, P., and V.
Yasevich, "Sockets API Extensions for the Stream Control
Transmission Protocol (SCTP)", RFC 6458,
DOI 10.17487/RFC6458, December 2011,
<https://www.rfc-editor.org/info/rfc6458>.
[5] Amer, P. D., Becke, M., Dreibholz, T., Ekiz, N., Iyengar,
J., Natarajan, P., Stewart, R. R., and M. Tuexen, "Load
Sharing for the Stream Control Transmission Protocol
(SCTP)", Work in Progress, Internet-Draft, draft-tuexen-
tsvwg-sctp-multipath-23, 9 February 2022,
<https://www.ietf.org/archive/id/draft-tuexen-tsvwg-sctp-
multipath-23.txt>.
[6] Dreibholz, T., Becke, M., and H. Adhari, "SCTP Socket API
Extensions for Concurrent Multipath Transfer", Work in
Progress, Internet-Draft, draft-dreibholz-tsvwg-
sctpsocket-multipath-23, 6 September 2021,
<https://www.ietf.org/archive/id/draft-dreibholz-tsvwg-
sctpsocket-multipath-23.txt>.
8.2. Informative References
[7] Dreibholz, T., Seggelmann, R., Tüxen, M., and E. P.
Rathgeb, "Transmission Scheduling Optimizations for
Concurrent Multipath Transfer", Proceedings of the 8th
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International Workshop on Protocols for Future, Large-
Scale and Diverse Network Transports (PFLDNeT) Volume 8,
ISSN 2074-5168, 29 November 2010, <https://www.wiwi.uni-
due.de/fileadmin/fileupload/I-TDR/SCTP/Paper/
PFLDNeT2010.pdf>.
[8] Dreibholz, T., Becke, M., Rathgeb, E. P., and M. Tüxen,
"On the Use of Concurrent Multipath Transfer over
Asymmetric Paths", Proceedings of the IEEE Global
Communications
Conference (GLOBECOM) ISBN 978-1-4244-5637-6,
DOI 10.1109/GLOCOM.2010.5683579, 7 December 2010,
<https://www.wiwi.uni-due.de/fileadmin/fileupload/I-
TDR/SCTP/Paper/Globecom2010.pdf>.
[9] Adhari, H., Dreibholz, T., Becke, M., Rathgeb, E. P., and
M. Tüxen, "Evaluation of Concurrent Multipath Transfer
over Dissimilar Paths", Proceedings of the 1st
International Workshop on Protocols and Applications with
Multi-Homing Support (PAMS) Pages 708-714,
ISBN 978-0-7695-4338-3, DOI 10.1109/WAINA.2011.92, 22
March 2011, <https://www.wiwi.uni-
due.de/fileadmin/fileupload/I-TDR/SCTP/Paper/
PAMS2011.pdf>.
[10] Dreibholz, T., Becke, M., Adhari, H., and E. P. Rathgeb,
"On the Impact of Congestion Control for Concurrent
Multipath Transfer on the Transport Layer", Proceedings of
the 11th IEEE International Conference on
Telecommunications (ConTEL) Pages 397-404,
ISBN 978-953-184-152-8, 16 June 2011,
<https://www.wiwi.uni-due.de/fileadmin/fileupload/I-
TDR/SCTP/Paper/ConTEL2011.pdf>.
[11] Dreibholz, T., Becke, M., Adhari, H., and E. P. Rathgeb,
"Evaluation of A New Multipath Congestion Control Scheme
using the NetPerfMeter Tool-Chain", Proceedings of the
19th IEEE International Conference on Software,
Telecommunications and Computer Networks (SoftCOM) Pages
1-6, ISBN 978-953-290-027-9, 16 September 2011,
<https://www.wiwi.uni-due.de/fileadmin/fileupload/I-
TDR/SCTP/Paper/SoftCOM2011.pdf>.
[12] Dreibholz, T., Adhari, H., Becke, M., and E. P. Rathgeb,
"Simulation and Experimental Evaluation of Multipath
Congestion Control Strategies", Proceedings of the 2nd
International Workshop on Protocols and Applications with
Multi-Homing Support (PAMS) ISBN 978-0-7695-4652-0,
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DOI 10.1109/WAINA.2012.186, 29 March 2012,
<https://www.wiwi.uni-due.de/fileadmin/fileupload/I-
TDR/SCTP/Paper/PAMS2012.pdf>.
[13] Dreibholz, T., "Evaluation and Optimisation of Multi-Path
Transport using the Stream Control Transmission
Protocol", Habilitation Treatise, 13 March 2012,
<https://duepublico.uni-duisburg-
essen.de/servlets/DerivateServlet/Derivate-29737/
Dre2012_final.pdf>.
[14] Dreibholz, T. and E. G. Gran, "Design and Implementation
of the NorNet Core Research Testbed for Multi-Homed
Systems", Proceedings of the 3nd International Workshop on
Protocols and Applications with Multi-Homing
Support (PAMS) Pages 1094-1100, ISBN 978-0-7695-4952-1,
DOI 10.1109/WAINA.2013.71, 27 March 2013,
<https://www.simula.no/file/
threfereedinproceedingsreference2012-12-207643198512pdf/
download>.
[15] Gran, E. G., Dreibholz, T., and A. Kvalbein, "NorNet Core
– A Multi-Homed Research Testbed", Computer Networks,
Special Issue on Future Internet Testbeds Volume 61, Pages
75-87, ISSN 1389-1286, DOI 10.1016/j.bjp.2013.12.035, 14
March 2014,
<https://www.simula.no/file/simulasimula2236pdf/download>.
[16] Dreibholz, T., "NorNet – A Real-World, Large-Scale Multi-
Homing Testbed", 2022, <https://www.nntb.no/>.
Authors' Addresses
Thomas Dreibholz
Simula Metropolitan Centre for Digital Engineering
Pilestredet 52
0167 Oslo
Norway
Email: dreibh@simula.no
URI: https://www.simula.no/people/dreibh
Robin Seggelmann
Münster University of Applied Sciences
Stegerwaldstraße 39
48565 Steinfurt
Germany
Email: seggelmann@fh-muenster.de
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Martin Becke
HAW Hamburg, Informatics Department
Berliner Tor 7
20099 Hamburg
Germany
Phone: +49-40-42875-8104
Email: martin.becke@haw-hamburg.de
URI: http://www.scimbe.de/about.html
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