An Unreliable Datagram Extension to QUIC
draft-pauly-quic-datagram-00

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Last updated 2018-09-10
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Network Working Group                                           T. Pauly
Internet-Draft                                                E. Kinnear
Intended status: Standards Track                             D. Schinazi
Expires: March 14, 2019                                       Apple Inc.
                                                      September 10, 2018

                An Unreliable Datagram Extension to QUIC
                      draft-pauly-quic-datagram-00

Abstract

   This document defines an extension to the QUIC transport protocol to
   add support for sending and receiving unreliable datagrams over a
   QUIC connection.

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
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   This Internet-Draft will expire on March 14, 2019.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Specification of Requirements . . . . . . . . . . . . . .   2
   2.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Transport Parameter . . . . . . . . . . . . . . . . . . . . .   3
   4.  Datagram Frame Type . . . . . . . . . . . . . . . . . . . . .   3
   5.  Behavior and Usage  . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Flow Control and Acknowledgements . . . . . . . . . . . .   4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   9.  Informative References  . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The QUIC Transport Protocol [I-D.ietf-quic-transport] provides a
   secure, multiplexed connection for transmitting reliable streams of
   application data.  Reliability within QUIC is performed on a per-
   stream basis, so some frame types are not eligible for
   retransmission.

   Some applications, particularly those that need to transmit real-time
   data, prefer to transmit data unreliably.  These applications can
   build directly upon UDP [RFC0768] as a transport, and can add
   security with DTLS [RFC6347].  Extending QUIC to support transmitting
   unreliable application data would provide another option for secure
   datagrams, with the added benefit of sharing a cryptographic and
   authentication context used for reliable streams.

   This document defines two new DATAGRAM QUIC frame types, which carry
   application data without requiring retransmissions.

1.1.  Specification of Requirements

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

2.  Motivation

   Transmitting unreliable data over QUIC provides benefits over
   existing solutions:

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   o  Applications that open both a reliable TLS stream and an
      unreliable DTLS flow to the same peer can benefit by sharing a
      single handshake and authentication context between a reliable
      QUIC stream and flow of unreliable QUIC datagrams.  This can
      reduce the latency required for handshakes.

   o  QUIC uses a more nuanced loss recovery mechanism than the DTLS
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