Requirements for the design of a Substrate Protocol for User Datagrams (SPUD)
draft-trammell-spud-req-01

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Network Working Group                                   B. Trammell, Ed.
Internet-Draft                                        M. Kuehlewind, Ed.
Intended status: Informational                                ETH Zurich
Expires: April 21, 2016                                 October 19, 2015

 Requirements for the design of a Substrate Protocol for User Datagrams
                                 (SPUD)
                       draft-trammell-spud-req-01

Abstract

   The Substrate Protocol for User Datagrams (SPUD) BoF session at the
   IETF 92 meeting in Dallas in March 2015 identified the potential need
   for a UDP-based encapsulation protocol to allow explicit cooperation
   with middleboxes while using new, encrypted transport protocols.
   This document proposes an initial set of requirements for such a
   protocol, and discusses tradeoffs to be made in further refining
   these requirements.

Status of This Memo

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   This Internet-Draft will expire on April 21, 2016.

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
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Trammell & Kuehlewind    Expires April 21, 2016                 [Page 1]
Internet-Draft              SPUD requirements               October 2015

   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.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  History . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Functional Requirements . . . . . . . . . . . . . . . . . . .   5
     5.1.  Grouping of Packets (into "tubes")  . . . . . . . . . . .   5
     5.2.  Endpoint to Path Signaling  . . . . . . . . . . . . . . .   6
     5.3.  Path to Endpoint Signaling  . . . . . . . . . . . . . . .   6
     5.4.  Tube Start and End Signaling  . . . . . . . . . . . . . .   6
     5.5.  Extensibility . . . . . . . . . . . . . . . . . . . . . .   6
     5.6.  Authentication  . . . . . . . . . . . . . . . . . . . . .   7
     5.7.  Proof a device is on-path . . . . . . . . . . . . . . . .   7
     5.8.  Integrity . . . . . . . . . . . . . . . . . . . . . . . .   7
     5.9.  Privacy . . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Technical Requirements  . . . . . . . . . . . . . . . . . . .   7
     6.1.  Middlebox Traversal . . . . . . . . . . . . . . . . . . .   8
     6.2.  Low Overhead in Network Processing  . . . . . . . . . . .   8
     6.3.  Implementability in User-Space  . . . . . . . . . . . . .   8
     6.4.  Incremental Deployability in an Untrusted, Unreliable
           Environment . . . . . . . . . . . . . . . . . . . . . . .   8
     6.5.  Protection against trivial abuse  . . . . . . . . . . . .   8
     6.6.  No unnecessary restrictions on the superstrate  . . . . .   9
     6.7.  Minimal additional start-up latency . . . . . . . . . . .   9
     6.8.  Minimal Header Overhead . . . . . . . . . . . . . . . . .   9
     6.9.  Minimal non-productive traffic  . . . . . . . . . . . . .   9
     6.10. Preservation of Security Properties . . . . . . . . . . .  10
     6.11. Reliability, Fragmentation, and Duplication . . . . . . .  10
     6.12. Interoperability with non-encapsulated superstrates . . .  10
   7.  Open questions and discussion . . . . . . . . . . . . . . . .  10
     7.1.  Tradeoffs in tube identifiers . . . . . . . . . . . . . .  11
     7.2.  Property binding  . . . . . . . . . . . . . . . . . . . .  12
     7.3.  Tradeoffs in integrity protection . . . . . . . . . . . .  12
     7.4.  In-band, out-of-band, piggybacked, and interleaved
           signaling . . . . . . . . . . . . . . . . . . . . . . . .  12
     7.5.  Continuum of trust among endpoints and middleboxes  . . .  13
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