Additional Policies for the Partially Reliable Stream Control Transmission Protocol Extension
RFC 7496

Document Type RFC - Proposed Standard (April 2015; No errata)
Last updated 2015-10-14
Replaces draft-tuexen-tsvwg-sctp-prpolicies
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Internet Engineering Task Force (IETF)                         M. Tuexen
Request for Comments: 7496              Muenster Univ. of Appl. Sciences
Category: Standards Track                                  R. Seggelmann
ISSN: 2070-1721                      Metafinanz Informationssysteme GmbH
                                                              R. Stewart
                                                           Netflix, Inc.
                                                               S. Loreto
                                                                Ericsson
                                                              April 2015

             Additional Policies for the Partially Reliable
             Stream Control Transmission Protocol Extension

Abstract

   This document defines two additional policies for the Partially
   Reliable Stream Control Transmission Protocol (PR-SCTP) extension.
   These policies allow limitation of the number of retransmissions and
   prioritization of user messages for more efficient usage of the send
   buffer.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7496.

Tuexen, et al.               Standards Track                    [Page 1]
RFC 7496               Additional PR-SCTP Policies            April 2015

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Additional PR-SCTP Policies . . . . . . . . . . . . . . . . .   3
     3.1.  Limited Retransmissions Policy  . . . . . . . . . . . . .   3
     3.2.  Priority Policy . . . . . . . . . . . . . . . . . . . . .   4
   4.  Socket API Considerations . . . . . . . . . . . . . . . . . .   4
     4.1.  Data Types  . . . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  Support for Added PR-SCTP Policies  . . . . . . . . . . .   5
     4.3.  Socket Option for Getting the Stream-Specific PR-SCTP
           Status (SCTP_PR_STREAM_STATUS)  . . . . . . . . . . . . .   6
     4.4.  Socket Option for Getting the Association-Specific
           PR-SCTP Status (SCTP_PR_ASSOC_STATUS) . . . . . . . . . .   7
     4.5.  Socket Option for Getting and Setting the PR-SCTP Support
           (SCTP_PR_SUPPORTED) . . . . . . . . . . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

Tuexen, et al.               Standards Track                    [Page 2]
RFC 7496               Additional PR-SCTP Policies            April 2015

1.  Introduction

   The Partially Reliable SCTP (PR-SCTP) extension defined in [RFC3758]
   provides a generic method for senders to abandon user messages.  The
   decision to abandon a user message is sender side only, and the exact
   condition is called a "PR-SCTP policy" ([RFC3758] refers to them as
   "PR-SCTP Services").  [RFC3758] also defines one particular PR-SCTP
   policy, called "Timed Reliability".  This allows the sender to
   specify a timeout for a user message after which the SCTP stack
   abandons the user message.

   This document specifies the following two additional PR-SCTP
   policies:

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