Sender Queue Info Option for the SCTP Socket API
draft-dreibholz-tsvwg-sctpsocket-sqinfo-04
The information below is for an old version of the document.
| Document | Type |
This is an older version of an Internet-Draft whose latest revision state is "Active".
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|---|---|---|---|
| Authors | Thomas Dreibholz , Robin Seggelmann , Martin Becke | ||
| Last updated | 2012-07-01 | ||
| RFC stream | (None) | ||
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| Additional resources | |||
| Stream | Stream state | (No stream defined) | |
| Consensus boilerplate | Unknown | ||
| RFC Editor Note | (None) | ||
| IESG | IESG state | I-D Exists | |
| Telechat date | (None) | ||
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draft-dreibholz-tsvwg-sctpsocket-sqinfo-04
Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Conventions . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Sender Queue Info (SCTP_SQINFO) . . . . . . . . . . . . . . . . 3 3. Security Considerations . . . . . . . . . . . . . . . . . . . . 4 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4 5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 4 6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6.1. Normative References . . . . . . . . . . . . . . . . . . . 4 6.2. Informative References . . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 Dreibholz, et al. Expires January 3, 2013 [Page 2] Internet-Draft Sender Queue Info Option July 2012 1. Introduction This draft describes an extension to the SCTP sockets API (see [RFC6458], [I-D.dreibholz-tsvwg-sctpsocket-multipath] [RFC4960]) 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 [PFLDNeT2010]. In particular, this API extension is useful when using the CMT-SCTP, CMT/RPv1-SCTP, CMT/RPv2-SCTP and MPTCP-like extensions (see [I-D.tuexen-tsvwg-sctp-multipath], [Dre2012], [PAMS2012], [PAMS2011], [ConTEL2011], [SoftCOM2011], [Globecom2010]) for Concurrent Multipath Transfer (CMT) with SCTP. 1.1. 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]. 2. 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: 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. Dreibholz, et al. Expires January 3, 2013 [Page 3] Internet-Draft Sender Queue Info Option July 2012 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. 3. Security Considerations Security considerations for the SCTP sockets API are described by [RFC6458]. 4. IANA Considerations This document does not require IANA actions. 5. Acknowledgments The authors would like to thank Michael Tuexen and Irene Ruengeler for their support. 6. References 6.1. 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. [RFC6458] Stewart, R., Tuexen, M., Poon, K., Lei, P., and V. Dreibholz, et al. Expires January 3, 2013 [Page 4] Internet-Draft Sender Queue Info Option July 2012 Yasevich, "Sockets API Extensions for the Stream Control Transmission Protocol (SCTP)", RFC 6458, December 2011. [I-D.tuexen-tsvwg-sctp-multipath] Amer, P., Becke, M., Dreibholz, T., Ekiz, N., Iyengar, J., Natarajan, P., Stewart, R., and M. Tuexen, "Load Sharing for the Stream Control Transmission Protocol (SCTP)", draft-tuexen-tsvwg-sctp-multipath-04 (work in progress), March 2012. [I-D.dreibholz-tsvwg-sctpsocket-multipath] Dreibholz, T., Becke, M., and H. Adhari, "SCTP Socket API Extensions for Concurrent Multipath Transfer", draft-dreibholz-tsvwg-sctpsocket-multipath-03 (work in progress), March 2012. 6.2. Informative References [PFLDNeT2010] Dreibholz, T., Seggelmann, R., Tuexen, M., and E. Rathgeb, "Transmission Scheduling Optimizations for Concurrent Multipath Transfer", Proceedings of the 8th International Workshop on Protocols for Future, Large-Scale and Diverse Network Transports (PFLDNeT), Volume 8, ISSN 2074-5168, November 2010. [Globecom2010] Dreibholz, T., Becke, M., Rathgeb, E., and M. Tuexen, "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, December 2010. [PAMS2011] Adhari, H., Dreibholz, T., Becke, M., Rathgeb, E., and M. Tuexen, "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, March 2011. [ConTEL2011] Dreibholz, T., Becke, M., Adhari, H., and E. 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, June 2011. Dreibholz, et al. Expires January 3, 2013 [Page 5] Internet-Draft Sender Queue Info Option July 2012 [SoftCOM2011] Dreibholz, T., Becke, M., Adhari, H., and E. 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), ISBN 978-953-290-027-9, September 2011. [PAMS2012] Dreibholz, T., Adhari, H., Becke, M., and E. 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) , March 2012. [Dre2012] Dreibholz, T., "Evaluation and Optimisation of Multi-Path Transport using the Stream Control Transmission Protocol", March 2012. Authors' Addresses Thomas Dreibholz Simula Research Laboratory, Network Systems Group Martin Linges vei 17 1364 Fornebu, Oestlandet Norway Phone: +47-6782-8200 Fax: +47-6782-8201 Email: dreibh@simula.no URI: http://www.iem.uni-due.de/~dreibh/ Robin Seggelmann Muenster University of Applied Sciences Stegerwaldstrasse 39 48565 Steinfurt, Nordrhein-Westfalen Germany Email: seggelmann@fh-muenster.de Dreibholz, et al. Expires January 3, 2013 [Page 6] Internet-Draft Sender Queue Info Option July 2012 Martin Becke University of Duisburg-Essen, Institute for Experimental Mathematics Ellernstrasse 29 45326 Essen, Nordrhein-Westfalen Germany Phone: +49-201-183-7667 Fax: +49-201-183-7673 Email: martin.becke@uni-due.de Dreibholz, et al. Expires January 3, 2013 [Page 7]