/usr/lib/firewalld/services/ Current File: //usr/lib/firewalld/services/tftp-client.xml

<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>TFTP Client</short>
  <description>This option allows you to access Trivial File Transfer Protocol (TFTP) servers. You need the tftp package installed for this option to be useful.</description>
  <helper name="tftp"/>
</service>