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-<table class="head">
-  <tr>
-    <td class="head-ltitle">BPF(9)</td>
-    <td class="head-vol">Kernel Developer's Manual</td>
-    <td class="head-rtitle">BPF(9)</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">bpf</code> &#x2014; <span class="Nd">Berkeley
-    Packet Filter</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">net/bpf.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">bpfattach</code>(<var class="Fa" style="white-space: nowrap;">struct
-    ifnet *ifp</var>, <var class="Fa" style="white-space: nowrap;">u_int
-    dlt</var>, <var class="Fa" style="white-space: nowrap;">u_int
-  hdrlen</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">bpfattach2</code>(<var class="Fa">struct ifnet *ifp</var>,
-    <var class="Fa">u_int dlt</var>, <var class="Fa">u_int hdrlen</var>,
-    <var class="Fa">struct bpf_if **driverp</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">bpfdetach</code>(<var class="Fa" style="white-space: nowrap;">struct
-    ifnet *ifp</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">bpf_tap</code>(<var class="Fa" style="white-space: nowrap;">struct
-    ifnet *ifp</var>, <var class="Fa" style="white-space: nowrap;">u_char
-    *pkt</var>, <var class="Fa" style="white-space: nowrap;">u_int
-    *pktlen</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">bpf_mtap</code>(<var class="Fa" style="white-space: nowrap;">struct
-    ifnet *ifp</var>, <var class="Fa" style="white-space: nowrap;">struct mbuf
-    *m</var>);</p>
-<p class="Pp"><var class="Ft">void</var>
-  <br/>
-  <code class="Fn">bpf_mtap2</code>(<var class="Fa" style="white-space: nowrap;">struct
-    bpf_if *bp</var>, <var class="Fa" style="white-space: nowrap;">void
-    *data</var>, <var class="Fa" style="white-space: nowrap;">u_int dlen</var>,
-    <var class="Fa" style="white-space: nowrap;">struct mbuf *m</var>);</p>
-<p class="Pp"><var class="Ft">u_int</var>
-  <br/>
-  <code class="Fn">bpf_filter</code>(<var class="Fa">const struct bpf_insn *pc
-    </var>, <var class="Fa">u_char *pkt</var>, <var class="Fa">u_int
-    wirelen</var>, <var class="Fa">u_int buflen</var>);</p>
-<p class="Pp"><var class="Ft">int</var>
-  <br/>
-  <code class="Fn">bpf_validate</code>(<var class="Fa" style="white-space: nowrap;">const
-    struct bpf_insn *fcode</var>,
-    <var class="Fa" style="white-space: nowrap;">int flen</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The Berkeley Packet Filter provides a raw interface, that is
-    protocol independent, to data link layers. It allows all packets on the
-    network, even those destined for other hosts, to be passed from a network
-    interface to user programs. Each program may specify a filter, in the form
-    of a <code class="Nm">bpf</code> filter machine program. The
-    <a class="Xr">bpf(4)</a> manual page describes the interface used by user
-    programs. This manual page describes the functions used by interfaces to
-    pass packets to <code class="Nm">bpf</code> and the functions for testing
-    and running <code class="Nm">bpf</code> filter machine programs.</p>
-<p class="Pp" id="bpfattach">The
-    <a class="permalink" href="#bpfattach"><code class="Fn">bpfattach</code></a>()
-    function attaches a network interface to <code class="Nm">bpf</code>. The
-    <var class="Fa">ifp</var> argument is a pointer to the structure that
-    defines the interface to be attached to an interface. The
-    <var class="Fa">dlt</var> argument is the data link-layer type:
-    <code class="Dv">DLT_NULL</code> (no link-layer encapsulation),
-    <code class="Dv">DLT_EN10MB</code> (Ethernet),
-    <code class="Dv">DLT_IEEE802_11</code> (802.11 wireless networks), etc. The
-    rest of the link layer types can be found in
-    <code class="In">&lt;<a class="In">net/bpf.h</a>&gt;</code>. The
-    <var class="Fa">hdrlen</var> argument is the fixed size of the link header;
-    variable length headers are not yet supported. The
-    <code class="Nm">bpf</code> system will hold a pointer to
-    <var class="Fa">ifp-&gt;if_bpf</var>. This variable will set to a
-    non-<code class="Dv">NULL</code> value when <code class="Nm">bpf</code>
-    requires packets from this interface to be tapped using the functions
-  below.</p>
-<p class="Pp" id="bpfattach2">The
-    <a class="permalink" href="#bpfattach2"><code class="Fn">bpfattach2</code></a>()
-    function allows multiple <code class="Nm">bpf</code> instances to be
-    attached to a single interface, by registering an explicit
-    <var class="Fa">if_bpf</var> rather than using
-    <var class="Fa">ifp-&gt;if_bpf</var>. It is then possible to run
-    <a class="Xr">tcpdump(1)</a> on the interface for any data link-layer types
-    attached.</p>
-<p class="Pp" id="bpfdetach">The
-    <a class="permalink" href="#bpfdetach"><code class="Fn">bpfdetach</code></a>()
-    function detaches a <code class="Nm">bpf</code> instance from an interface,
-    specified by <var class="Fa">ifp</var>. The
-    <code class="Fn">bpfdetach</code>() function should be called once for each
-    <code class="Nm">bpf</code> instance attached.</p>
-<p class="Pp" id="bpf_tap">The
-    <a class="permalink" href="#bpf_tap"><code class="Fn">bpf_tap</code></a>()
-    function is used by an interface to pass the packet to
-    <code class="Nm">bpf</code>. The packet data (including link-header),
-    pointed to by <var class="Fa">pkt</var>, is of length
-    <var class="Fa">pktlen</var>, which must be a contiguous buffer. The
-    <var class="Fa">ifp</var> argument is a pointer to the structure that
-    defines the interface to be tapped. The packet is parsed by each processes
-    filter, and if accepted, it is buffered for the process to read.</p>
-<p class="Pp" id="bpf_mtap">The
-    <a class="permalink" href="#bpf_mtap"><code class="Fn">bpf_mtap</code></a>()
-    function is like <code class="Fn">bpf_tap</code>() except that it is used to
-    tap packets that are in an <var class="Vt">mbuf</var> chain,
-    <var class="Fa">m</var>. The <var class="Fa">ifp</var> argument is a pointer
-    to the structure that defines the interface to be tapped. Like
-    <code class="Fn">bpf_tap</code>(), <code class="Fn">bpf_mtap</code>()
-    requires a link-header for whatever data link layer type is specified. Note
-    that <code class="Nm">bpf</code> only reads from the
-    <var class="Vt">mbuf</var> chain, it does not free it or keep a pointer to
-    it. This means that an <var class="Vt">mbuf</var> containing the link-header
-    can be prepended to the chain if necessary. A cleaner interface to achieve
-    this is provided by <code class="Fn">bpf_mtap2</code>().</p>
-<p class="Pp" id="bpf_mtap2">The
-    <a class="permalink" href="#bpf_mtap2"><code class="Fn">bpf_mtap2</code></a>()
-    function allows the user to pass a link-header <var class="Fa">data</var>,
-    of length <var class="Fa">dlen</var>, independent of the
-    <var class="Vt">mbuf</var> <var class="Fa">m</var>, containing the packet.
-    This simplifies the passing of some link-headers.</p>
-<p class="Pp" id="bpf_filter">The
-    <a class="permalink" href="#bpf_filter"><code class="Fn">bpf_filter</code></a>()
-    function executes the filter program starting at <var class="Fa">pc</var> on
-    the packet <var class="Fa">pkt</var>. The <var class="Fa">wirelen</var>
-    argument is the length of the original packet and
-    <var class="Fa">buflen</var> is the amount of data present. The
-    <var class="Fa">buflen</var> value of 0 is special; it indicates that the
-    <var class="Fa">pkt</var> is actually a pointer to an mbuf chain
-    (<var class="Vt">struct mbuf *</var>).</p>
-<p class="Pp" id="bpf_validate">The
-    <a class="permalink" href="#bpf_validate"><code class="Fn">bpf_validate</code></a>()
-    function checks that the filter code <var class="Fa">fcode</var>, of length
-    <var class="Fa">flen</var>, is valid.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="RETURN_VALUES"><a class="permalink" href="#RETURN_VALUES">RETURN
-  VALUES</a></h1>
-<p class="Pp">The <code class="Fn">bpf_filter</code>() function returns -1 (cast
-    to an unsigned integer) if there is no filter. Otherwise, it returns the
-    result of the filter program.</p>
-<p class="Pp">The <code class="Fn">bpf_validate</code>() function returns 0 when
-    the program is not a valid filter program.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="EVENT_HANDLERS"><a class="permalink" href="#EVENT_HANDLERS">EVENT
-  HANDLERS</a></h1>
-<p class="Pp"><code class="Nm">bpf</code> invokes
-    <var class="Fa">bpf_track</var> <a class="Xr">EVENTHANDLER(9)</a> event each
-    time listener attaches to or detaches from an interface. Pointer to
-    (<var class="Vt">struct ifnet *</var>) is passed as the first argument,
-    interface <var class="Fa">dlt</var> follows. Last argument indicates
-    listener is attached (1) or detached (0). Note that handler is invoked with
-    <code class="Nm">bpf</code> global lock held, which implies restriction on
-    sleeping and calling <code class="Nm">bpf</code> subsystem inside
-    <a class="Xr">EVENTHANDLER(9)</a> dispatcher. Note that handler is not
-    called for write-only listeners.</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">tcpdump(1)</a>, <a class="Xr">bpf(4)</a>,
-    <a class="Xr">EVENTHANDLER(9)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The Enet packet filter was created in 1980 by Mike Accetta and
-    Rick Rashid at Carnegie-Mellon University. Jeffrey Mogul, at Stanford,
-    ported the code to <span class="Ux">BSD</span> and continued its development
-    from 1983 on. Since then, it has evolved into the Ultrix Packet Filter at
-    DEC, a STREAMS NIT module under SunOS 4.1, and BPF.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp"><span class="An">Steven McCanne</span>, of Lawrence Berkeley
-    Laboratory, implemented BPF in Summer 1990. Much of the design is due to
-    <span class="An">Van Jacobson</span>. This manpage was written by
-    <span class="An">Orla McGann</span>.</p>
-</section>
-</div>
-<table class="foot">
-  <tr>
-    <td class="foot-date">May 11, 2012</td>
-    <td class="foot-os">FreeBSD 15.0</td>
-  </tr>
-</table>