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<section id="multipath-tcp-mptcp">
<h1>Multipath TCP (MPTCP)<a class="headerlink" href="#multipath-tcp-mptcp" title="Link to this heading">¶</a></h1>
<section id="introduction">
<h2>Introduction<a class="headerlink" href="#introduction" title="Link to this heading">¶</a></h2>
<p>Multipath TCP or MPTCP is an extension to the standard TCP and is described in
<a class="reference external" href="https://www.rfc-editor.org/rfc/rfc8684.html">RFC 8684 (MPTCPv1)</a>. It allows a
device to make use of multiple interfaces at once to send and receive TCP
packets over a single MPTCP connection. MPTCP can aggregate the bandwidth of
multiple interfaces or prefer the one with the lowest latency. It also allows a
fail-over if one path is down, and the traffic is seamlessly reinjected on other
paths.</p>
<p>For more details about Multipath TCP in the Linux kernel, please see the
official website: <a class="reference external" href="https://www.mptcp.dev">mptcp.dev</a>.</p>
</section>
<section id="use-cases">
<h2>Use cases<a class="headerlink" href="#use-cases" title="Link to this heading">¶</a></h2>
<p>Thanks to MPTCP, being able to use multiple paths in parallel or simultaneously
brings new use-cases, compared to TCP:</p>
<ul class="simple">
<li><p>Seamless handovers: switching from one path to another while preserving
established connections, e.g. to be used in mobility use-cases, like on
smartphones.</p></li>
<li><p>Best network selection: using the “best” available path depending on some
conditions, e.g. latency, losses, cost, bandwidth, etc.</p></li>
<li><p>Network aggregation: using multiple paths at the same time to have a higher
throughput, e.g. to combine fixed and mobile networks to send files faster.</p></li>
</ul>
</section>
<section id="concepts">
<h2>Concepts<a class="headerlink" href="#concepts" title="Link to this heading">¶</a></h2>
<p>Technically, when a new socket is created with the <code class="docutils literal notranslate"><span class="pre">IPPROTO_MPTCP</span></code> protocol
(Linux-specific), a <em>subflow</em> (or <em>path</em>) is created. This <em>subflow</em> consists of
a regular TCP connection that is used to transmit data through one interface.
Additional <em>subflows</em> can be negotiated later between the hosts. For the remote
host to be able to detect the use of MPTCP, a new field is added to the TCP
<em>option</em> field of the underlying TCP <em>subflow</em>. This field contains, amongst
other things, a <code class="docutils literal notranslate"><span class="pre">MP_CAPABLE</span></code> option that tells the other host to use MPTCP if
it is supported. If the remote host or any middlebox in between does not support
it, the returned <code class="docutils literal notranslate"><span class="pre">SYN+ACK</span></code> packet will not contain MPTCP options in the TCP
<em>option</em> field. In that case, the connection will be “downgraded” to plain TCP,
and it will continue with a single path.</p>
<p>This behavior is made possible by two internal components: the path manager, and
the packet scheduler.</p>
<section id="path-manager">
<h3>Path Manager<a class="headerlink" href="#path-manager" title="Link to this heading">¶</a></h3>
<p>The Path Manager is in charge of <em>subflows</em>, from creation to deletion, and also
address announcements. Typically, it is the client side that initiates subflows,
and the server side that announces additional addresses via the <code class="docutils literal notranslate"><span class="pre">ADD_ADDR</span></code> and
<code class="docutils literal notranslate"><span class="pre">REMOVE_ADDR</span></code> options.</p>
<p>Path managers are controlled by the <code class="docutils literal notranslate"><span class="pre">net.mptcp.path_manager</span></code> sysctl knob --
see <a class="reference internal" href="mptcp-sysctl.html"><span class="doc">MPTCP Sysfs variables</span></a>. There are two types: the in-kernel one (<code class="docutils literal notranslate"><span class="pre">kernel</span></code>) where
the same rules are applied for all the connections (see: <code class="docutils literal notranslate"><span class="pre">ip</span> <span class="pre">mptcp</span></code>) ; and the
userspace one (<code class="docutils literal notranslate"><span class="pre">userspace</span></code>), controlled by a userspace daemon (i.e. <a class="reference external" href="https://mptcpd.mptcp.dev/">mptcpd</a>) where different rules can be applied for each
connection. The path managers can be controlled via a Netlink API; see
<a class="reference internal" href="../netlink/specs/mptcp_pm.html"><span class="doc">Family mptcp_pm netlink specification</span></a>.</p>
<p>To be able to use multiple IP addresses on a host to create multiple <em>subflows</em>
(paths), the default in-kernel MPTCP path-manager needs to know which IP
addresses can be used. This can be configured with <code class="docutils literal notranslate"><span class="pre">ip</span> <span class="pre">mptcp</span> <span class="pre">endpoint</span></code> for
example.</p>
</section>
<section id="packet-scheduler">
<h3>Packet Scheduler<a class="headerlink" href="#packet-scheduler" title="Link to this heading">¶</a></h3>
<p>The Packet Scheduler is in charge of selecting which available <em>subflow(s)</em> to
use to send the next data packet. It can decide to maximize the use of the
available bandwidth, only to pick the path with the lower latency, or any other
policy depending on the configuration.</p>
<p>Packet schedulers are controlled by the <code class="docutils literal notranslate"><span class="pre">net.mptcp.scheduler</span></code> sysctl knob --
see <a class="reference internal" href="mptcp-sysctl.html"><span class="doc">MPTCP Sysfs variables</span></a>.</p>
</section>
</section>
<section id="sockets-api">
<h2>Sockets API<a class="headerlink" href="#sockets-api" title="Link to this heading">¶</a></h2>
<section id="creating-mptcp-sockets">
<h3>Creating MPTCP sockets<a class="headerlink" href="#creating-mptcp-sockets" title="Link to this heading">¶</a></h3>
<p>On Linux, MPTCP can be used by selecting MPTCP instead of TCP when creating the
<code class="docutils literal notranslate"><span class="pre">socket</span></code>:</p>
<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span><span class="w"> </span><span class="n">sd</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">socket</span><span class="p">(</span><span class="n">AF_INET</span><span class="p">(</span><span class="mi">6</span><span class="p">),</span><span class="w"> </span><span class="n">SOCK_STREAM</span><span class="p">,</span><span class="w"> </span><span class="n">IPPROTO_MPTCP</span><span class="p">);</span>
</pre></div>
</div>
<p>Note that <code class="docutils literal notranslate"><span class="pre">IPPROTO_MPTCP</span></code> is defined as <code class="docutils literal notranslate"><span class="pre">262</span></code>.</p>
<p>If MPTCP is not supported, <code class="docutils literal notranslate"><span class="pre">errno</span></code> will be set to:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">EINVAL</span></code>: (<em>Invalid argument</em>): MPTCP is not available, on kernels &lt; 5.6.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">EPROTONOSUPPORT</span></code> (<em>Protocol not supported</em>): MPTCP has not been compiled,
on kernels &gt;= v5.6.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">ENOPROTOOPT</span></code> (<em>Protocol not available</em>): MPTCP has been disabled using
<code class="docutils literal notranslate"><span class="pre">net.mptcp.enabled</span></code> sysctl knob; see <a class="reference internal" href="mptcp-sysctl.html"><span class="doc">MPTCP Sysfs variables</span></a>.</p></li>
</ul>
<p>MPTCP is then opt-in: applications need to explicitly request it. Note that
applications can be forced to use MPTCP with different techniques, e.g.
<code class="docutils literal notranslate"><span class="pre">LD_PRELOAD</span></code> (see <code class="docutils literal notranslate"><span class="pre">mptcpize</span></code>), eBPF (see <code class="docutils literal notranslate"><span class="pre">mptcpify</span></code>), SystemTAP,
<code class="docutils literal notranslate"><span class="pre">GODEBUG</span></code> (<code class="docutils literal notranslate"><span class="pre">GODEBUG=multipathtcp=1</span></code>), etc.</p>
<p>Switching to <code class="docutils literal notranslate"><span class="pre">IPPROTO_MPTCP</span></code> instead of <code class="docutils literal notranslate"><span class="pre">IPPROTO_TCP</span></code> should be as
transparent as possible for the userspace applications.</p>
</section>
<section id="socket-options">
<h3>Socket options<a class="headerlink" href="#socket-options" title="Link to this heading">¶</a></h3>
<p>MPTCP supports most socket options handled by TCP. It is possible some less
common options are not supported, but contributions are welcome.</p>
<p>Generally, the same value is propagated to all subflows, including the ones
created after the calls to <code class="docutils literal notranslate"><span class="pre">setsockopt()</span></code>. eBPF can be used to set different
values per subflow.</p>
<p>There are some MPTCP specific socket options at the <code class="docutils literal notranslate"><span class="pre">SOL_MPTCP</span></code> (284) level to
retrieve info. They fill the <code class="docutils literal notranslate"><span class="pre">optval</span></code> buffer of the <code class="docutils literal notranslate"><span class="pre">getsockopt()</span></code> system
call:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">MPTCP_INFO</span></code>: Uses <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">mptcp_info</span></code>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MPTCP_TCPINFO</span></code>: Uses <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">mptcp_subflow_data</span></code>, followed by an array of
<code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">tcp_info</span></code>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MPTCP_SUBFLOW_ADDRS</span></code>: Uses <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">mptcp_subflow_data</span></code>, followed by an
array of <code class="docutils literal notranslate"><span class="pre">mptcp_subflow_addrs</span></code>.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MPTCP_FULL_INFO</span></code>: Uses <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">mptcp_full_info</span></code>, with one pointer to an
array of <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">mptcp_subflow_info</span></code> (including the
<code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">mptcp_subflow_addrs</span></code>), and one pointer to an array of
<code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">tcp_info</span></code>, followed by the content of <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">mptcp_info</span></code>.</p></li>
</ul>
<p>Note that at the TCP level, <code class="docutils literal notranslate"><span class="pre">TCP_IS_MPTCP</span></code> socket option can be used to know
if MPTCP is currently being used: the value will be set to 1 if it is.</p>
</section>
</section>
<section id="design-choices">
<h2>Design choices<a class="headerlink" href="#design-choices" title="Link to this heading">¶</a></h2>
<p>A new socket type has been added for MPTCP for the userspace-facing socket. The
kernel is in charge of creating subflow sockets: they are TCP sockets where the
behavior is modified using TCP-ULP.</p>
<p>MPTCP listen sockets will create “plain” <em>accepted</em> TCP sockets if the
connection request from the client didn’t ask for MPTCP, making the performance
impact minimal when MPTCP is enabled by default.</p>
</section>
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