O_BASIC_IP_DST_MASK
(*cmd)->opcode = O_BASIC_IP_DST_MASK;
keyword(MODULE_BASIC_ID, O_BASIC_IP_DST_MASK, "to-[mask]", TO);
function(MODULE_BASIC_ID, O_BASIC_IP_DST_MASK,
O_BASIC_IP_DST_MASK, (filter_func)check_to_mask);