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draft-ietf-quic-invariants.html
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<!DOCTYPE html>
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<title>Version-Independent Properties of QUIC</title>
<meta content="Martin Thomson" name="author">
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This document defines the properties of the QUIC transport protocol that are
expected to remain unchanged over time as new versions of the protocol are
developed.
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</head>
<body>
<table class="ears">
<thead><tr>
<td class="left">Internet-Draft</td>
<td class="center">QUIC Invariants</td>
<td class="right">December 2020</td>
</tr></thead>
<tfoot><tr>
<td class="left">Thomson</td>
<td class="center">Expires 13 June 2021</td>
<td class="right">[Page]</td>
</tr></tfoot>
</table>
<div id="external-metadata" class="document-information"></div>
<div id="internal-metadata" class="document-information">
<dl id="identifiers">
<dt class="label-workgroup">Workgroup:</dt>
<dd class="workgroup">QUIC</dd>
<dt class="label-internet-draft">Internet-Draft:</dt>
<dd class="internet-draft">draft-ietf-quic-invariants</dd>
<dt class="label-published">Published:</dt>
<dd class="published">
<time datetime="2020-12-10" class="published">10 December 2020</time>
</dd>
<dt class="label-intended-status">Intended Status:</dt>
<dd class="intended-status">Standards Track</dd>
<dt class="label-expires">Expires:</dt>
<dd class="expires"><time datetime="2021-06-13">13 June 2021</time></dd>
<dt class="label-authors">Author:</dt>
<dd class="authors">
<div class="author">
<div class="author-name">M. Thomson</div>
<div class="org">Mozilla</div>
</div>
</dd>
</dl>
</div>
<h1 id="title">Version-Independent Properties of QUIC</h1>
<section id="section-abstract">
<h2 id="abstract"><a href="#abstract" class="selfRef">Abstract</a></h2>
<p id="section-abstract-1">This document defines the properties of the QUIC transport protocol that are
expected to remain unchanged over time as new versions of the protocol are
developed.<a href="#section-abstract-1" class="pilcrow">¶</a></p>
</section>
<section class="note" id="section-note.1">
<h2 id="name-note-to-readers">
<a href="#name-note-to-readers" class="section-name selfRef">Note to Readers</a>
</h2>
<p id="section-note.1-1">Discussion of this draft takes place on the QUIC working group mailing list
(<a href="mailto:quic@ietf.org">quic@ietf.org</a>), which is archived at
<span><a href="https://mailarchive.ietf.org/arch/search/?email_list=quic">https://mailarchive.ietf.org/arch/search/?email_list=quic</a></span>.<a href="#section-note.1-1" class="pilcrow">¶</a></p>
<p id="section-note.1-2">Working Group information can be found at <span><a href="https://github.com/quicwg">https://github.com/quicwg</a></span>; source
code and issues list for this draft can be found at
<span><a href="https://github.com/quicwg/base-drafts/labels/-invariants">https://github.com/quicwg/base-drafts/labels/-invariants</a></span>.<a href="#section-note.1-2" class="pilcrow">¶</a></p>
</section>
<div id="status-of-memo">
<section id="section-boilerplate.1">
<h2 id="name-status-of-this-memo">
<a href="#name-status-of-this-memo" class="section-name selfRef">Status of This Memo</a>
</h2>
<p id="section-boilerplate.1-1">
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.<a href="#section-boilerplate.1-1" class="pilcrow">¶</a></p>
<p id="section-boilerplate.1-2">
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 <span><a href="https://datatracker.ietf.org/drafts/current/">https://datatracker.ietf.org/drafts/current/</a></span>.<a href="#section-boilerplate.1-2" class="pilcrow">¶</a></p>
<p id="section-boilerplate.1-3">
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."<a href="#section-boilerplate.1-3" class="pilcrow">¶</a></p>
<p id="section-boilerplate.1-4">
This Internet-Draft will expire on 13 June 2021.<a href="#section-boilerplate.1-4" class="pilcrow">¶</a></p>
</section>
</div>
<div id="copyright">
<section id="section-boilerplate.2">
<h2 id="name-copyright-notice">
<a href="#name-copyright-notice" class="section-name selfRef">Copyright Notice</a>
</h2>
<p id="section-boilerplate.2-1">
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.<a href="#section-boilerplate.2-1" class="pilcrow">¶</a></p>
<p id="section-boilerplate.2-2">
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(<span><a href="https://trustee.ietf.org/license-info">https://trustee.ietf.org/license-info</a></span>) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with
respect to this document. Code Components extracted from this
document must 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.<a href="#section-boilerplate.2-2" class="pilcrow">¶</a></p>
</section>
</div>
<div id="toc">
<section id="section-toc.1">
<a href="#" onclick="scroll(0,0)" class="toplink">▲</a><h2 id="name-table-of-contents">
<a href="#name-table-of-contents" class="section-name selfRef">Table of Contents</a>
</h2>
<nav class="toc"><ul class="ulEmpty toc compact">
<li class="ulEmpty toc compact" id="section-toc.1-1.1">
<p id="section-toc.1-1.1.1" class="keepWithNext"><a href="#section-1" class="xref">1</a>. <a href="#name-an-extremely-abstract-descr" class="xref">An Extremely Abstract Description of QUIC</a><a href="#section-toc.1-1.1.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.2">
<p id="section-toc.1-1.2.1" class="keepWithNext"><a href="#section-2" class="xref">2</a>. <a href="#name-fixed-properties-of-all-qui" class="xref">Fixed Properties of All QUIC Versions</a><a href="#section-toc.1-1.2.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.3">
<p id="section-toc.1-1.3.1" class="keepWithNext"><a href="#section-3" class="xref">3</a>. <a href="#name-conventions-and-definitions" class="xref">Conventions and Definitions</a><a href="#section-toc.1-1.3.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.4">
<p id="section-toc.1-1.4.1"><a href="#section-4" class="xref">4</a>. <a href="#name-notational-conventions" class="xref">Notational Conventions</a><a href="#section-toc.1-1.4.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.5">
<p id="section-toc.1-1.5.1"><a href="#section-5" class="xref">5</a>. <a href="#name-quic-packets" class="xref">QUIC Packets</a><a href="#section-toc.1-1.5.1" class="pilcrow">¶</a></p>
<ul class="ulEmpty toc compact">
<li class="ulEmpty toc compact" id="section-toc.1-1.5.2.1">
<p id="section-toc.1-1.5.2.1.1"><a href="#section-5.1" class="xref">5.1</a>. <a href="#name-long-header" class="xref">Long Header</a><a href="#section-toc.1-1.5.2.1.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.5.2.2">
<p id="section-toc.1-1.5.2.2.1"><a href="#section-5.2" class="xref">5.2</a>. <a href="#name-short-header" class="xref">Short Header</a><a href="#section-toc.1-1.5.2.2.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.5.2.3">
<p id="section-toc.1-1.5.2.3.1"><a href="#section-5.3" class="xref">5.3</a>. <a href="#name-connection-id" class="xref">Connection ID</a><a href="#section-toc.1-1.5.2.3.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.5.2.4">
<p id="section-toc.1-1.5.2.4.1"><a href="#section-5.4" class="xref">5.4</a>. <a href="#name-version" class="xref">Version</a><a href="#section-toc.1-1.5.2.4.1" class="pilcrow">¶</a></p>
</li>
</ul>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.6">
<p id="section-toc.1-1.6.1"><a href="#section-6" class="xref">6</a>. <a href="#name-version-negotiation" class="xref">Version Negotiation</a><a href="#section-toc.1-1.6.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.7">
<p id="section-toc.1-1.7.1"><a href="#section-7" class="xref">7</a>. <a href="#name-security-and-privacy-consid" class="xref">Security and Privacy Considerations</a><a href="#section-toc.1-1.7.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.8">
<p id="section-toc.1-1.8.1"><a href="#section-8" class="xref">8</a>. <a href="#name-iana-considerations" class="xref">IANA Considerations</a><a href="#section-toc.1-1.8.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.9">
<p id="section-toc.1-1.9.1"><a href="#section-9" class="xref">9</a>. <a href="#name-references" class="xref">References</a><a href="#section-toc.1-1.9.1" class="pilcrow">¶</a></p>
<ul class="ulEmpty toc compact">
<li class="ulEmpty toc compact" id="section-toc.1-1.9.2.1">
<p id="section-toc.1-1.9.2.1.1"><a href="#section-9.1" class="xref">9.1</a>. <a href="#name-normative-references" class="xref">Normative References</a><a href="#section-toc.1-1.9.2.1.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.9.2.2">
<p id="section-toc.1-1.9.2.2.1"><a href="#section-9.2" class="xref">9.2</a>. <a href="#name-informative-references" class="xref">Informative References</a><a href="#section-toc.1-1.9.2.2.1" class="pilcrow">¶</a></p>
</li>
</ul>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.10">
<p id="section-toc.1-1.10.1"><a href="#section-appendix.a" class="xref">Appendix A</a>. <a href="#name-incorrect-assumptions" class="xref">Incorrect Assumptions</a><a href="#section-toc.1-1.10.1" class="pilcrow">¶</a></p>
</li>
<li class="ulEmpty toc compact" id="section-toc.1-1.11">
<p id="section-toc.1-1.11.1"><a href="#section-appendix.b" class="xref"></a><a href="#name-authors-address" class="xref">Author's Address</a><a href="#section-toc.1-1.11.1" class="pilcrow">¶</a></p>
</li>
</ul>
</nav>
</section>
</div>
<div id="an-extremely-abstract-description-of-quic">
<section id="section-1">
<h2 id="name-an-extremely-abstract-descr">
<a href="#section-1" class="section-number selfRef">1. </a><a href="#name-an-extremely-abstract-descr" class="section-name selfRef">An Extremely Abstract Description of QUIC</a>
</h2>
<p id="section-1-1">QUIC is a connection-oriented protocol between two endpoints. Those endpoints
exchange UDP datagrams. These UDP datagrams contain QUIC packets. QUIC
endpoints use QUIC packets to establish a QUIC connection, which is shared
protocol state between those endpoints.<a href="#section-1-1" class="pilcrow">¶</a></p>
</section>
</div>
<div id="fixed-properties-of-all-quic-versions">
<section id="section-2">
<h2 id="name-fixed-properties-of-all-qui">
<a href="#section-2" class="section-number selfRef">2. </a><a href="#name-fixed-properties-of-all-qui" class="section-name selfRef">Fixed Properties of All QUIC Versions</a>
</h2>
<p id="section-2-1">In addition to providing secure, multiplexed transport, QUIC <span>[<a href="#QUIC-TRANSPORT" class="xref">QUIC-TRANSPORT</a>]</span>
allows for the option to negotiate a version. This allows the protocol to
change over time in response to new requirements. Many characteristics of the
protocol could change between versions.<a href="#section-2-1" class="pilcrow">¶</a></p>
<p id="section-2-2">This document describes the subset of QUIC that is intended to remain stable as
new versions are developed and deployed. All of these invariants are