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-<table class="head">
- <tr>
- <td class="head-ltitle">DTRACE_UDP(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">DTRACE_UDP(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">dtrace_udp</code> &#x2014; <span class="Nd">a
- DTrace provider for tracing events related to the UDP protocol</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Fn">udp:::receive</code>(<var class="Fa" style="white-space: nowrap;">pktinfo_t
- *</var>, <var class="Fa" style="white-space: nowrap;">csinfo_t *</var>,
- <var class="Fa" style="white-space: nowrap;">ipinfo_t *</var>,
- <var class="Fa" style="white-space: nowrap;">udpsinfo_t *</var>,
- <var class="Fa" style="white-space: nowrap;">udpinfo_t *</var>);</p>
-<p class="Pp"><code class="Fn">udp:::send</code>(<var class="Fa" style="white-space: nowrap;">pktinfo_t
- *</var>, <var class="Fa" style="white-space: nowrap;">csinfo_t *</var>,
- <var class="Fa" style="white-space: nowrap;">ipinfo_t *</var>,
- <var class="Fa" style="white-space: nowrap;">udpsinfo_t *</var>,
- <var class="Fa" style="white-space: nowrap;">udpinfo_t *</var>);</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The DTrace <code class="Nm">udp</code> provider allows users to
- trace events in the <a class="Xr">udp(4)</a> protocol implementation. The
- <a class="permalink" href="#udp:::send"><code class="Fn" id="udp:::send">udp:::send</code></a>()
- probe fires whenever the kernel prepares to transmit a UDP packet, and the
- <a class="permalink" href="#udp:::receive"><code class="Fn" id="udp:::receive">udp:::receive</code></a>()
- probe fires whenever the kernel receives a UDP packet, unless the UDP header
- is incomplete, the destination port is 0, the length field is invalid, or
- the checksum is wrong. The arguments to these probes can be used to obtain
- detailed information about the IP and UDP headers of the corresponding
- packet.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="ARGUMENTS"><a class="permalink" href="#ARGUMENTS">ARGUMENTS</a></h1>
-<p class="Pp">The <var class="Vt">pktinfo_t</var> argument is currently
- unimplemented and is included for compatibility with other implementations
- of this provider. Its fields are:</p>
-<div class="Bd-indent">
-<dl class="Bl-tag">
- <dt><var class="Vt">uintptr_t pkt_addr</var></dt>
- <dd>Always set to 0.</dd>
-</dl>
-</div>
-<p class="Pp">The <var class="Vt">csinfo_t</var> argument is currently
- unimplemented and is included for compatibility with other implementations
- of this provider. Its fields are:</p>
-<div class="Bd-indent">
-<dl class="Bl-tag">
- <dt><var class="Vt">uintptr_t cs_addr</var></dt>
- <dd>Always set to 0.</dd>
- <dt><var class="Vt">uint64_t cs_cid</var></dt>
- <dd>A pointer to the <var class="Vt">struct inpcb</var> for this packet, or
- <code class="Dv">NULL</code>.</dd>
- <dt><var class="Vt">pid_t cs_pid</var></dt>
- <dd>Always set to 0.</dd>
-</dl>
-</div>
-<p class="Pp">The <var class="Vt">ipinfo_t</var> argument contains IP fields
- common to both IPv4 and IPv6 packets. Its fields are:</p>
-<div class="Bd-indent">
-<dl class="Bl-tag">
- <dt><var class="Vt">uint8_t ip_ver</var></dt>
- <dd>IP version of the packet, 4 for IPv4 packets and 6 for IPv6 packets.</dd>
- <dt><var class="Vt">uint32_t ip_plength</var></dt>
- <dd>IP payload size. This does not include the size of the IP header or IPv6
- option headers.</dd>
- <dt><var class="Vt">string ip_saddr</var></dt>
- <dd>IP source address.</dd>
- <dt><var class="Vt">string ip_daddr</var></dt>
- <dd>IP destination address.</dd>
-</dl>
-</div>
-<p class="Pp">The <var class="Vt">udpsinfo_t</var> argument contains the state
- of the UDP connection associated with the packet. Its fields are:</p>
-<div class="Bd-indent">
-<dl class="Bl-tag">
- <dt><var class="Vt">uintptr_t udps_addr</var></dt>
- <dd>Pointer to the <var class="Vt">struct inpcb</var> containing the IP state
- for the associated socket.</dd>
- <dt><var class="Vt">uint16_t udps_lport</var></dt>
- <dd>Local UDP port.</dd>
- <dt><var class="Vt">uint16_t udps_rport</var></dt>
- <dd>Remote UDP port.</dd>
- <dt><var class="Vt">string udps_laddr</var></dt>
- <dd>Local IPv4 or IPv6 address.</dd>
- <dt><var class="Vt">string udps_raddr</var></dt>
- <dd>Remote IPv4 or IPv6 address.</dd>
-</dl>
-</div>
-<p class="Pp">The <var class="Vt">udpinfo_t</var> argument is the raw UDP header
- of the packet, with all fields in host order. Its fields are:</p>
-<div class="Bd-indent">
-<dl class="Bl-tag">
- <dt><var class="Vt">uint16_t udp_sport</var></dt>
- <dd>Source UDP port.</dd>
- <dt><var class="Vt">uint16_t udp_dport</var></dt>
- <dd>Destination UDP port.</dd>
- <dt><var class="Vt">uint16_t udp_length</var></dt>
- <dd>Length of the UDP header and payload, in bytes.</dd>
- <dt><var class="Vt">uint16_t udp_checksum</var></dt>
- <dd>A checksum of the UDP header and payload, or 0 if no checksum was
- calculated.</dd>
- <dt><var class="Vt">struct udphdr *udp_hdr</var></dt>
- <dd>A pointer to the raw UDP header.</dd>
-</dl>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
-<dl class="Bl-tag Bl-compact">
- <dt><span class="Pa">/usr/lib/dtrace/udp.d</span></dt>
- <dd>DTrace type and translator definitions for the <code class="Nm">udp</code>
- provider.</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
-<p class="Pp">The following script counts transmitted packets by destination
- port.</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>udp:::send
-{
- @num[args[4]-&gt;udp_dport] = count();
-}</pre>
-</div>
-<p class="Pp">This script will print some details of each UDP packet as it is
- sent or received by the kernel:</p>
-<div class="Bd Pp Bd-indent Li">
-<pre>#pragma D option quiet
-#pragma D option switchrate=10Hz
-
-dtrace:::BEGIN
-{
- printf(&quot; %10s %36s %-36s %6s\n&quot;, &quot;DELTA(us)&quot;, &quot;SOURCE&quot;,
- &quot;DEST&quot;, &quot;BYTES&quot;);
- last = timestamp;
-}
-
-udp:::send
-{
- this-&gt;elapsed = (timestamp - last) / 1000;
- self-&gt;dest = strjoin(strjoin(args[2]-&gt;ip_daddr, &quot;:&quot;),
- lltostr(args[4]-&gt;udp_dport));
- printf(&quot; %10d %30s:%-5d -&gt; %-36s %6d\n&quot;, this-&gt;elapsed,
- args[2]-&gt;ip_saddr, args[4]-&gt;udp_sport,
- self-&gt;dest, args[4]-&gt;udp_length);
- last = timestamp;
-}
-
-udp:::receive
-{
- this-&gt;elapsed = (timestamp - last) / 1000;
- self-&gt;dest = strjoin(strjoin(args[2]-&gt;ip_saddr, &quot;:&quot;),
- lltostr(args[4]-&gt;udp_sport));
- printf(&quot; %10d %30s:%-5d &lt;- %-36s %6d\n&quot;, this-&gt;elapsed,
- args[2]-&gt;ip_daddr, args[4]-&gt;udp_dport,
- self-&gt;dest, args[4]-&gt;udp_length);
- last = timestamp;
-}</pre>
-</div>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="COMPATIBILITY"><a class="permalink" href="#COMPATIBILITY">COMPATIBILITY</a></h1>
-<p class="Pp">This provider is compatible with the <code class="Nm">udp</code>
- provider in Solaris.</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">dtrace(1)</a>, <a class="Xr">dtrace_ip(4)</a>,
- <a class="Xr">dtrace_sctp(4)</a>, <a class="Xr">dtrace_tcp(4)</a>,
- <a class="Xr">dtrace_udplite(4)</a>, <a class="Xr">udp(4)</a>,
- <a class="Xr">SDT(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">udp</code> provider first appeared in
- <span class="Ux">FreeBSD</span> 10.0.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
-<p class="Pp">This manual page was written by <span class="An">Mark
- Johnston</span>
- &lt;<a class="Mt" href="mailto:markj@FreeBSD.org">markj@FreeBSD.org</a>&gt;.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">August 1, 2018</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>