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-<table class="head">
- <tr>
- <td class="head-ltitle">NG_IPFW(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">NG_IPFW(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_ipfw</code> &#x2014;
- <span class="Nd">interface between netgraph and IP firewall</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">netinet/ip_var.h</a>&gt;</code>
- <br/>
- <code class="In">#include
- &lt;<a class="In">netgraph/ng_ipfw.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">ipfw</code> node implements interface between
- <a class="Xr">ipfw(4)</a> and <a class="Xr">netgraph(4)</a> subsystems.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HOOKS"><a class="permalink" href="#HOOKS">HOOKS</a></h1>
-<p class="Pp">The <code class="Nm">ipfw</code> node supports an arbitrary number
- of hooks, which must be named using only numeric characters.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="OPERATION"><a class="permalink" href="#OPERATION">OPERATION</a></h1>
-<p class="Pp">Once the <code class="Nm">ng_ipfw</code> module is loaded into the
- kernel, a single node named <var class="Va">ipfw</var> is automatically
- created. No more <code class="Nm">ipfw</code> nodes can be created. Once
- destroyed, the only way to recreate the node is to reload the
- <code class="Nm">ng_ipfw</code> module.</p>
-<p class="Pp">Packets can be injected into <a class="Xr">netgraph(4)</a> using
- either the <code class="Cm">netgraph</code> or <code class="Cm">ngtee</code>
- commands of the <a class="Xr">ipfw(8)</a> utility. These commands require a
- numeric cookie to be supplied as an argument. Packets are sent out of the
- hook whose name equals the cookie value. If no hook matches, packets are
- discarded. Packets injected via the <code class="Cm">netgraph</code> command
- are tagged with <var class="Vt">struct ipfw_rule_ref</var>. This tag
- contains information that helps the packet to re-enter
- <a class="Xr">ipfw(4)</a> processing, should the packet come back from
- <a class="Xr">netgraph(4)</a> to <a class="Xr">ipfw(4)</a>.</p>
-<p class="Pp">Packets received by a node from <a class="Xr">netgraph(4)</a>
- subsystem must be tagged with <var class="Vt">struct ipfw_rule_ref</var>
- tag. Packets re-enter IP firewall processing at the next rule. If no tag is
- supplied, packets are discarded.</p>
-</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 only the generic control messages.</p>
-</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 a
- <code class="Dv">NGM_SHUTDOWN</code> control message. Do not do this, since
- the new <code class="Nm">ipfw</code> node can only be created by reloading
- the <code class="Nm">ng_ipfw</code> module.</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">ipfw(4)</a>, <a class="Xr">netgraph(4)</a>,
- <a class="Xr">ipfw(8)</a>, <a class="Xr">mbuf_tags(9)</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">ipfw</code> node type was implemented in
- <span class="Ux">FreeBSD 6.0</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">The <code class="Nm">ipfw</code> node was written by
- <span class="An">Gleb Smirnoff</span>
- &lt;<a class="Mt" href="mailto:glebius@FreeBSD.org">glebius@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">March 2, 2010</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>