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+<table class="head">
+ <tr>
+ <td class="head-ltitle">NG_TEE(4)</td>
+ <td class="head-vol">Device Drivers Manual</td>
+ <td class="head-rtitle">NG_TEE(4)</td>
+ </tr>
+</table>
+<div class="manual-text">
+<section class="Sh">
+<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
+<p class="Pp"><code class="Nm">ng_tee</code> &#x2014; <span class="Nd">netgraph
+ ``tee'' node type</span></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
+<p class="Pp"><code class="In">#include
+ &lt;<a class="In">sys/types.h</a>&gt;</code>
+ <br/>
+ <code class="In">#include
+ &lt;<a class="In">netgraph/ng_tee.h</a>&gt;</code></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The <code class="Nm">tee</code> node type has a purpose similar to
+ the <a class="Xr">tee(1)</a> command. <code class="Nm">Tee</code> nodes are
+ useful for debugging or &#x201C;snooping&#x201D; on a connection between two
+ netgraph nodes. <code class="Nm">Tee</code> nodes have four hooks,
+ <code class="Dv">right</code>, <code class="Dv">left</code>,
+ <code class="Dv">right2left</code>, and <code class="Dv">left2right</code>.
+ All data received on <code class="Dv">right</code> is sent unmodified to
+ <a class="permalink" href="#both"><i class="Em" id="both">both</i></a> hooks
+ <code class="Dv">left</code> and <code class="Dv">right2left</code>.
+ Similarly, all data received on <code class="Dv">left</code> is sent
+ unmodified to both <code class="Dv">right</code> and
+ <code class="Dv">left2right</code>.</p>
+<p class="Pp">Packets may also be received on <code class="Dv">right2left</code>
+ and <code class="Dv">left2right</code>; if so, they are forwarded unchanged
+ out hooks <code class="Dv">right</code> and <code class="Dv">left</code>,
+ respectively.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HOOKS"><a class="permalink" href="#HOOKS">HOOKS</a></h1>
+<p class="Pp">This node type supports the following hooks:</p>
+<dl class="Bl-tag">
+ <dt id="right"><var class="Va">right</var></dt>
+ <dd>The connection to the node on the right.</dd>
+ <dt id="left"><var class="Va">left</var></dt>
+ <dd>The connection to the node on the left.</dd>
+ <dt id="right2left"><var class="Va">right2left</var></dt>
+ <dd>Tap for right to left traffic.</dd>
+ <dt id="left2right"><var class="Va">left2right</var></dt>
+ <dd>Tap for left to right traffic.</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="CONTROL_MESSAGES"><a class="permalink" href="#CONTROL_MESSAGES">CONTROL
+ MESSAGES</a></h1>
+<p class="Pp">This node type supports the generic control messages, plus the
+ following.</p>
+<dl class="Bl-tag">
+ <dt id="NGM_TEE_GET_STATS"><a class="permalink" href="#NGM_TEE_GET_STATS"><code class="Dv">NGM_TEE_GET_STATS</code></a>
+ (<code class="Ic">getstats</code>)</dt>
+ <dd>Get statistics, returned as a <code class="Dv">struct
+ ng_tee_stats</code>.</dd>
+ <dt id="NGM_TEE_CLR_STATS"><a class="permalink" href="#NGM_TEE_CLR_STATS"><code class="Dv">NGM_TEE_CLR_STATS</code></a>
+ (<code class="Ic">clrstats</code>)</dt>
+ <dd>Clear statistics.</dd>
+</dl>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SHUTDOWN"><a class="permalink" href="#SHUTDOWN">SHUTDOWN</a></h1>
+<p class="Pp">This node shuts down upon receipt of an
+ <code class="Dv">NGM_SHUTDOWN</code> control message, or when all hooks have
+ been disconnected. If both <code class="Dv">right</code> and
+ <code class="Dv">left</code> hooks are present, node removes itself from the
+ chain gently, connecting <code class="Dv">right</code> and
+ <code class="Dv">left</code> together.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
+ ALSO</a></h1>
+<p class="Pp"><a class="Xr">tee(1)</a>, <a class="Xr">netgraph(4)</a>,
+ <a class="Xr">ngctl(8)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
+<p class="Pp">The <code class="Nm">ng_tee</code> node type was implemented in
+ <span class="Ux">FreeBSD 4.0</span>.</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
+<p class="Pp"><span class="An">Julian Elischer</span>
+ &lt;<a class="Mt" href="mailto:julian@FreeBSD.org">julian@FreeBSD.org</a>&gt;</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">May 28, 2004</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>