Multipath Extensions for QUIC (MP-QUIC)
draft-deconinck-quic-multipath-02

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QUIC Working Group                                         Q. De Coninck
Internet-Draft                                            O. Bonaventure
Intended status: Standards Track                               UCLouvain
Expires: September 8, 2019                                 March 7, 2019

                Multipath Extensions for QUIC (MP-QUIC)
                   draft-deconinck-quic-multipath-02

Abstract

   This document specifies extensions to the QUIC protocol to enable,
   other than connection migration, simultaneous usage of multiple paths
   for a single connection.  Those extensions remain compliant with the
   current single-path QUIC design.  They allow devices to benefit from
   multiple network paths while preserving the privacy features of QUIC.

Status of This Memo

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   This Internet-Draft will expire on September 8, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
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De Coninck & BonaventureExpires September 8, 2019               [Page 1]
Internet-Draft                   MP-QUIC                      March 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions and Definitions . . . . . . . . . . . . . . . . .   3
     2.1.  Notational Conventions  . . . . . . . . . . . . . . . . .   4
   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  What is a Path? . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Beyond Connection Migration . . . . . . . . . . . . . . .   5
     3.3.  Establishment of a Multipath QUIC Connection  . . . . . .   6
     3.4.  Architecture of Multipath QUIC  . . . . . . . . . . . . .   7
     3.5.  Path Establishment  . . . . . . . . . . . . . . . . . . .   8
     3.6.  Exchanging Data over Multiple Paths . . . . . . . . . . .   9
     3.7.  Exchanging Addresses  . . . . . . . . . . . . . . . . . .  10
     3.8.  Coping with Address Removals  . . . . . . . . . . . . . .  11
     3.9.  Path Migration  . . . . . . . . . . . . . . . . . . . . .  11
     3.10. Sharing Path Policies . . . . . . . . . . . . . . . . . .  12
     3.11. Congestion Control  . . . . . . . . . . . . . . . . . . .  12
   4.  Mapping Path ID to Connection IDs . . . . . . . . . . . . . .  13
   5.  Using Multiple Paths  . . . . . . . . . . . . . . . . . . . .  13
     5.1.  Multipath Negotiation . . . . . . . . . . . . . . . . . .  13
       5.1.1.  Transport Parameter Definition  . . . . . . . . . . .  14
     5.2.  Coping with Additional Remote Addresses . . . . . . . . .  14
     5.3.  Path State  . . . . . . . . . . . . . . . . . . . . . . .  14
     5.4.  Dynamic Management of Paths . . . . . . . . . . . . . . .  17
     5.5.  Losing Addresses  . . . . . . . . . . . . . . . . . . . .  17
     5.6.  Scheduling Strategies . . . . . . . . . . . . . . . . . .  18
   6.  Modifications to QUIC frames  . . . . . . . . . . . . . . . .  18
     6.1.  NEW_CONNECTION_ID Frame . . . . . . . . . . . . . . . . .  19
     6.2.  RETIRE_CONNECTION_ID Frame  . . . . . . . . . . . . . . .  20
     6.3.  ACK Frame . . . . . . . . . . . . . . . . . . . . . . . .  20
   7.  New Frames  . . . . . . . . . . . . . . . . . . . . . . . . .  21
     7.1.  MAX_PATHS Frame . . . . . . . . . . . . . . . . . . . . .  21
     7.2.  PATH_UPDATE Frame . . . . . . . . . . . . . . . . . . . .  22
     7.3.  ADD_ADDRESS Frame . . . . . . . . . . . . . . . . . . . .  23
     7.4.  REMOVE_ADDRESS Frame  . . . . . . . . . . . . . . . . . .  24
     7.5.  PATHS Frame . . . . . . . . . . . . . . . . . . . . . . .  24
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  26
     8.1.  Nonce Computation . . . . . . . . . . . . . . . . . . . .  26
     8.2.  Validation of Exchanged Addresses . . . . . . . . . . . .  26