Internet-Draft SCTP Socket API Extensions March 2024
Dreibholz, et al. Expires 1 October 2024 [Page]
Network Working Group
Intended Status:
T. Dreibholz
M. Becke
HAW Hamburg
H. Adhari
University of Duisburg-Essen

SCTP Socket API Extensions for Concurrent Multipath Transfer


This document describes extensions to the SCTP sockets API for configuring the CMT-SCTP and CMT/RP-SCTP extensions.

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."

This Internet-Draft will expire on 1 October 2024.

Table of Contents

1. Introduction

This draft describes extensions to the SCTP sockets API (see [2], [1]) which allow an application to configure the behaviour of the Concurrent Multipath Transfer (CMT) extensions CMT-SCTP, CMT/RPv1-SCTP, CMT/RPv2-SCTP and MPTCP-like (see [3], [10], [5], [4], [7], [6], [8], [9], [11]).

2. Concurrent Multipath Transfer and Resource Pooling Activation/Deactivation (SCTP_CMT_ON_OFF)

This socket option activates or deactivates CMT and sets the corresponding Resource Pooling variant to be applied. The sctp_assoc_value structure is used to specify the association for which the CMT state should be changed and the new CMT state.

Definition of the sctp_assoc_value structure:

struct sctp_assoc_value {
   sctp_assoc_t assoc_id;
   uint32_t     assoc_value;
Holds the identifier for the association of which the CMT state should be changed. Ignored for one-to-one style sockets.
Turns CMT off.
Turns plain CMT-SCTP on. No Resource Pooling is applied.
Turns CMT-SCTP on. CMT/RPv1 Resource Pooling as defined in [9] is applied.
Turns CMT-SCTP on. CMT/RPv2 Resource Pooling as defined in [8] is applied.
Turns CMT-SCTP on. MPTCP-like Resource Pooling as defined in [6], [8], [5] is applied.

3. 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 [12], [13], some further information can be found on the project website [14].

4. Security Considerations

Security considerations for the SCTP sockets API are described by [2].

5. IANA Considerations

This document does not require IANA actions.

6. Acknowledgments

The authors would like to thank Michael Tuexen for his support.

7. References

7.1. Normative References

Stewart, R., Ed., "Stream Control Transmission Protocol", RFC 4960, DOI 10.17487/RFC4960, , <>.
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, , <>.
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, , <>.

7.2. Informative References

Dreibholz, T., "Evaluation and Optimisation of Multi-Path Transport using the Stream Control Transmission Protocol", Habilitation Treatise, , <>.
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, DOI 10.1109/WAINA.2012.186, , <>.
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, , <>.
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, , <>.
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, , <>.
Dreibholz, T., Becke, M., Pulinthanath, J., and E. P. Rathgeb, "Applying TCP-Friendly Congestion Control to Concurrent Multipath Transfer", Proceedings of the 24th IEEE International Conference on Advanced Information Networking and Applications (AINA) Pages 312-319, ISBN 978-0-7695-4018-4, DOI 10.1109/AINA.2010.117, , <>.
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, , <>.
Iyengar, J. R., Amer, P. D., and R. Stewart, "Concurrent Multipath Transfer Using SCTP Multihoming Over Independent End-to-End Paths", IEEE/ACM Transactions on Networking, Volume 14, Number 5, Pages 951-964, ISSN 1063-6692, DOI 10.1109/TNET.2006.882843, , <>.
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, , <>.
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, , <>.
Dreibholz, T., "NorNet – A Real-World, Large-Scale Multi-Homing Testbed", , <>.

Authors' Addresses

Thomas Dreibholz
Simula Metropolitan Centre for Digital Engineering
Pilestredet 52
0167 Oslo
Martin Becke
HAW Hamburg, Informatics Department
Berliner Tor 7
20099 Hamburg
Hakim Adhari
University of Duisburg-Essen, Institute for Experimental Mathematics
Ellernstraße 29
45326 Essen