Additional Policies for the Partial Reliability Extension of the Stream Control Transmission Protocol
draft-ietf-tsvwg-sctp-prpolicies-02

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Network Working Group                                          M. Tuexen
Internet-Draft                          Muenster Univ. of Appl. Sciences
Intended status: Informational                             R. Seggelmann
Expires: October 10, 2014                   T-Systems International GmbH
                                                              R. Stewart
                                                          Adara Networks
                                                               S. Loreto
                                                                Ericsson
                                                           April 8, 2014

Additional Policies for the Partial Reliability Extension of the Stream
                     Control Transmission Protocol
                draft-ietf-tsvwg-sctp-prpolicies-02.txt

Abstract

   This document defines policies for the Partial Reliability Extension
   of the Stream Control Transmission Protocol (PR-SCTP) allowing to
   limit the number of retransmissions or to prioritize user messages
   for more efficient send buffer usage.

Status of This Memo

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   This Internet-Draft will expire on October 10, 2014.

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   Copyright (c) 2014 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

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   carefully, as they describe your rights and restrictions with respect
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Additional PR-SCTP Policies . . . . . . . . . . . . . . . . .   3
     2.1.  Limited Retransmissions Policy  . . . . . . . . . . . . .   3
     2.2.  Priority Policy . . . . . . . . . . . . . . . . . . . . .   3
   3.  Socket API Considerations . . . . . . . . . . . . . . . . . .   3
     3.1.  Data Types  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Support for Added PR-SCTP Policies  . . . . . . . . . . .   4
     3.3.  Socket Option for Getting the PR-SCTP Status
           (SCTP_PR_STATUS)  . . . . . . . . . . . . . . . . . . . .   4
     3.4.  Socket Option for Getting and Setting the PR-SCTP Support
           (SCTP_PR_SUPPORTED) . . . . . . . . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   The SCTP Partial Reliability Extension (PR-SCTP) 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] 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 two additional PR-SCTP policies:

   Limited Retransmission Policy:  Allows to limit the number of
      retransmissions.

   Priority Policy:  Allows to discard lower priority messages if space
      for higher priority messages is needed in the send buffer.

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2.  Additional PR-SCTP Policies

   This section defined two new PR-SCTP policies, one in each
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