iface_match
if (!iface || !iface_match(iface,
&& (!rif || !iface_match(rif,
&& (!oif || !iface_match(oif,
match = iface_match(m->m_pkthdr.rcvif,
match = iface_match(oif, (ipfw_insn_if *)cmd);
match = iface_match(oif ? oif :
*cmd_val = iface_match((*args)->oif ?