DNS Stateful Operations
draft-ietf-dnsop-session-signal-04

Document Type Active Internet-Draft (dnsop WG)
Last updated 2017-09-13
Replaces draft-bellis-dnsop-session-signal
Stream IETF
Intended RFC status Proposed Standard
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DNSOP Working Group                                            R. Bellis
Internet-Draft                                                       ISC
Updates: RFC 7766, RFC 1035 (if                              S. Cheshire
         approved)                                            Apple Inc.
Intended status: Standards Track                            J. Dickinson
Expires: March 17, 2018                                     S. Dickinson
                                                                 Sinodun
                                                               A. Mankin
                                                              Salesforce
                                                             T. Pusateri
                                                            Unaffiliated
                                                      September 13, 2017

                        DNS Stateful Operations
                   draft-ietf-dnsop-session-signal-04

Abstract

   This document defines a new DNS Stateful Operation OPCODE used to
   communicate operations within persistent stateful sessions, expressed
   using type-length-value (TLV) syntax, and defines an initial set of
   TLVs used to manage session timeouts and termination.  This mechanism
   is intended to reduce the overhead of existing "per-packet" signaling
   mechanisms with "per-message" semantics as well as defining new
   stateful operations not defined in EDNS(0).

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 17, 2018.

Bellis, et al.           Expires March 17, 2018                 [Page 1]
Internet-Draft           DNS Stateful Operations          September 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Protocol Details  . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  DSO Session Establishment . . . . . . . . . . . . . . . .   7
       4.1.1.  Middle-box Considerations . . . . . . . . . . . . . .   8
     4.2.  Message Format  . . . . . . . . . . . . . . . . . . . . .   8
       4.2.1.  Header  . . . . . . . . . . . . . . . . . . . . . . .   9
       4.2.2.  DSO Data  . . . . . . . . . . . . . . . . . . . . . .  10
       4.2.3.  EDNS(0) and TSIG  . . . . . . . . . . . . . . . . . .  12
     4.3.  Message Handling  . . . . . . . . . . . . . . . . . . . .  13
   5.  Keepalive Operation TLV . . . . . . . . . . . . . . . . . . .  14
     5.1.  Client handling of received Session Timeout values  . . .  16
     5.2.  Relation to EDNS(0) TCP Keepalive Option  . . . . . . . .  17
   6.  Retry Delay TLV . . . . . . . . . . . . . . . . . . . . . . .  17
     6.1.  Use as an Operation TLV . . . . . . . . . . . . . . . . .  18
     6.2.  Use as a Modifier TLV . . . . . . . . . . . . . . . . . .  19
   7.  Encryption Padding TLV  . . . . . . . . . . . . . . . . . . .  19
   8.  DSO Session Lifecycle and Timers  . . . . . . . . . . . . . .  20
     8.1.  DSO Session Initiation  . . . . . . . . . . . . . . . . .  20
     8.2.  DSO Session Timeouts  . . . . . . . . . . . . . . . . . .  20
     8.3.  Inactive DSO Sessions . . . . . . . . . . . . . . . . . .  20
     8.4.  The Inactivity Timeout  . . . . . . . . . . . . . . . . .  21
       8.4.1.  Closing Inactive DSO Sessions . . . . . . . . . . . .  21
       8.4.2.  Values for the Inactivity Timeout . . . . . . . . . .  22
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