c6760df099a2d688fa42a26">ip_input()</a> if the transport layer protocol is unknown and from <a class="el" href="udp_8c.html#a7b338a5515606bd51976fbc5bcec9611">udp_input()</a> if the local port is not bound.</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">p</td><td>the input packet for which the 'unreachable' should be sent, p-&gt;payload pointing to the IP header </td></tr>
    <tr><td class="paramname">t</td><td>type of the 'unreachable' packet </td></t