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Checking references for intended status: Experimental ---------------------------------------------------------------------------- ** Obsolete normative reference: RFC 4960 (Obsoleted by RFC 9260) == Outdated reference: A later version (-27) exists of draft-tuexen-tsvwg-sctp-multipath-03 == Outdated reference: A later version (-28) exists of draft-dreibholz-tsvwg-sctpsocket-multipath-02 Summary: 1 error (**), 0 flaws (~~), 3 warnings (==), 1 comment (--). Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 Network Working Group T. Dreibholz 3 Internet-Draft University of Duisburg-Essen 4 Intended status: Experimental R. Seggelmann 5 Expires: September 11, 2012 Muenster Univ. of Applied 6 Sciences 7 M. Becke 8 University of Duisburg-Essen 9 March 10, 2012 11 Sender Queue Info Option for the SCTP Socket API 12 draft-dreibholz-tsvwg-sctpsocket-sqinfo-03.txt 14 Abstract 16 This document describes an extension to the SCTP sockets API for 17 querying information about the sender queue. 19 Status of this Memo 21 This Internet-Draft is submitted in full conformance with the 22 provisions of BCP 78 and BCP 79. 24 Internet-Drafts are working documents of the Internet Engineering 25 Task Force (IETF). Note that other groups may also distribute 26 working documents as Internet-Drafts. The list of current Internet- 27 Drafts is at http://datatracker.ietf.org/drafts/current/. 29 Internet-Drafts are draft documents valid for a maximum of six months 30 and may be updated, replaced, or obsoleted by other documents at any 31 time. It is inappropriate to use Internet-Drafts as reference 32 material or to cite them other than as "work in progress." 34 This Internet-Draft will expire on September 11, 2012. 36 Copyright Notice 38 Copyright (c) 2012 IETF Trust and the persons identified as the 39 document authors. All rights reserved. 41 This document is subject to BCP 78 and the IETF Trust's Legal 42 Provisions Relating to IETF Documents 43 (http://trustee.ietf.org/license-info) in effect on the date of 44 publication of this document. Please review these documents 45 carefully, as they describe your rights and restrictions with respect 46 to this document. Code Components extracted from this document must 47 include Simplified BSD License text as described in Section 4.e of 48 the Trust Legal Provisions and are provided without warranty as 49 described in the Simplified BSD License. 51 Table of Contents 53 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 54 1.1. Conventions . . . . . . . . . . . . . . . . . . . . . . . . 3 55 2. Sender Queue Info (SCTP_SQINFO) . . . . . . . . . . . . . . . . 3 56 3. Security Considerations . . . . . . . . . . . . . . . . . . . . 4 57 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4 58 5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 4 59 6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 4 60 6.1. Normative References . . . . . . . . . . . . . . . . . . . 4 61 6.2. Informative References . . . . . . . . . . . . . . . . . . 5 62 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 64 1. Introduction 66 This draft describes an extension to the SCTP sockets API (see 67 [RFC6458], [I-D.dreibholz-tsvwg-sctpsocket-multipath] [RFC4960]) 68 which allows an application to query the sender queue utilization per 69 stream. This information is necessary for applications to make 70 efficient use of a mapping of streams to dissimilar paths. A 71 detailed description including simulation results can be found in 72 [PFLDNeT2010]. 74 In particular, this API extension is useful when using the CMT-SCTP, 75 CMT/RPv1-SCTP, CMT/RPv2-SCTP and MPTCP-like extensions (see 76 [I-D.tuexen-tsvwg-sctp-multipath], [Globecom2010], [PAMS2011], 77 [ConTEL2011], [SoftCOM2011], [PAMS2012]) for Concurrent Multipath 78 Transfer (CMT) with SCTP. 80 1.1. Conventions 82 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 83 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 84 document are to be interpreted as described in [RFC2119]. 86 2. Sender Queue Info (SCTP_SQINFO) 88 This socket option obtains the maximum sender queue size (in bytes), 89 the current total sender queue utilization (in bytes) as well as the 90 current utilization per stream (in bytes). 92 The following structure is used to obtain the sender queue 93 information: 95 struct sctp_sndqueueinfo { 96 sctp_assoc_t sq_assoc_id; 97 uint32_t sq_queue_limit; 98 uint32_t sq_total_queued; 99 uint32_t sq_number_of_streams; 100 uint32_t sq_queued_on_stream[]; 101 }; 103 sq_assoc_id: This parameter is ignored for one-to-one style sockets. 104 For one-to-many style sockets this parameter indicates which 105 association the user is performing an action upon. It is an error 106 to use SCTP_{CURRENT|ALL}_ASSOC in sq_assoc_id. 108 sq_queue_limit: This field gives the maximum sender queue size in 109 bytes. 111 sq_total_queued: This field gives the current total sender queue 112 utilization in bytes. 114 sq_number_of_streams: This field gives the number of outgoing 115 streams. That is, it will contain the number of valid 116 sq_queued_on_stream entries. 118 sq_queued_on_stream: This array gives the current number of bytes 119 queued for the streams 0 to sq_number_of_streams-1. 121 Note, that the caller of getsockopt() MUST provide a 122 sctp_sndqueueinfo structure which can hold at least as many 123 sq_queued_on_stream entries as the association's number of outgoing 124 streams. Otherwise, the getsockopt() call will fail and return an 125 error. 127 3. Security Considerations 129 Security considerations for the SCTP sockets API are described by 130 [RFC6458]. 132 4. IANA Considerations 134 This document does not require IANA actions. 136 5. Acknowledgments 138 The authors would like to thank Michael Tuexen and Irene Ruengeler 139 for their support. 141 6. References 143 6.1. Normative References 145 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 146 Requirement Levels", BCP 14, RFC 2119, March 1997. 148 [RFC4960] Stewart, R., "Stream Control Transmission Protocol", 149 RFC 4960, September 2007. 151 [RFC6458] Stewart, R., Tuexen, M., Poon, K., Lei, P., and V. 153 Yasevich, "Sockets API Extensions for the Stream Control 154 Transmission Protocol (SCTP)", RFC 6458, December 2011. 156 [I-D.tuexen-tsvwg-sctp-multipath] 157 Becke, M., Dreibholz, T., Iyengar, J., Natarajan, P., and 158 M. Tuexen, "Load Sharing for the Stream Control 159 Transmission Protocol (SCTP)", 160 draft-tuexen-tsvwg-sctp-multipath-03 (work in progress), 161 January 2012. 163 [I-D.dreibholz-tsvwg-sctpsocket-multipath] 164 Dreibholz, T. and M. Becke, "SCTP Socket API Extensions 165 for Concurrent Multipath Transfer", 166 draft-dreibholz-tsvwg-sctpsocket-multipath-02 (work in 167 progress), October 2011. 169 6.2. Informative References 171 [PFLDNeT2010] 172 Dreibholz, T., Seggelmann, R., Tuexen, M., and E. Rathgeb, 173 "Transmission Scheduling Optimizations for Concurrent 174 Multipath Transfer", Proceedings of the 8th International 175 Workshop on Protocols for Future, Large-Scale and Diverse 176 Network Transports (PFLDNeT), Volume 8, ISSN 2074-5168, 177 November 2010. 179 [Globecom2010] 180 Dreibholz, T., Becke, M., Rathgeb, E., and M. Tuexen, "On 181 the Use of Concurrent Multipath Transfer over Asymmetric 182 Paths", Proceedings of the IEEE Global Communications 183 Conference (GLOBECOM), ISBN 978-1-4244-5637-6, 184 DOI 10.1109/GLOCOM.2010.5683579, December 2010. 186 [PAMS2011] 187 Adhari, H., Dreibholz, T., Becke, M., Rathgeb, E., and M. 188 Tuexen, "Evaluation of Concurrent Multipath Transfer over 189 Dissimilar Paths", Proceedings of the 1st International 190 Workshop on Protocols and Applications with Multi-Homing 191 Support (PAMS), Pages 708-714, ISBN 978-0-7695-4338-3, 192 DOI 10.1109/WAINA.2011.92, March 2011. 194 [ConTEL2011] 195 Dreibholz, T., Becke, M., Adhari, H., and E. Rathgeb, "On 196 the Impact of Congestion Control for Concurrent Multipath 197 Transfer on the Transport Layer", Proceedings of the 11th 198 IEEE International Conference on 199 Telecommunications (ConTEL), Pages 397-404, ISBN 978-953- 200 184-152-8, June 2011. 202 [SoftCOM2011] 203 Dreibholz, T., Becke, M., Adhari, H., and E. Rathgeb, 204 "Evaluation of A New Multipath Congestion Control Scheme 205 using the NetPerfMeter Tool-Chain", Proceedings of the 206 19th IEEE International Conference on Software, 207 Telecommunications and Computer 208 Networks (SoftCOM), ISBN 978-953-290-027-9, 209 September 2011. 211 [PAMS2012] 212 Dreibholz, T., Adhari, H., Becke, M., and E. Rathgeb, 213 "Simulation and Experimental Evaluation of Multipath 214 Congestion Control Strategies", Proceedings of the 2nd 215 International Workshop on Protocols and Applications with 216 Multi-Homing Support (PAMS) , March 2012. 218 Authors' Addresses 220 Thomas Dreibholz 221 University of Duisburg-Essen, Institute for Experimental Mathematics 222 Ellernstrasse 29 223 45326 Essen, Nordrhein-Westfalen 224 Germany 226 Phone: +49-201-1837637 227 Fax: +49-201-1837673 228 Email: dreibh@iem.uni-due.de 229 URI: http://www.iem.uni-due.de/~dreibh/ 231 Robin Seggelmann 232 Muenster University of Applied Sciences 233 Stegerwaldstrasse 39 234 48565 Steinfurt, Nordrhein-Westfalen 235 Germany 237 Email: seggelmann@fh-muenster.de 238 Martin Becke 239 University of Duisburg-Essen, Institute for Experimental Mathematics 240 Ellernstrasse 29 241 45326 Essen, Nordrhein-Westfalen 242 Germany 244 Phone: +49-201-183-7667 245 Fax: +49-201-183-7673 246 Email: martin.becke@uni-due.de