create a function that receives a dblink as parameter

I need a function that returns the name of a datafile that is in any instance of my environment.

The function would be:

CREATE OR REPLACE FUNCTION f_data_file (v_file_id NUMBER, v_sid varchar)

RETURN VARCHAR2 is v_file_name VARCHAR2 (256);

BEGIN   

    SELECT file_name 

    INTO   v_file_name

    FROM   sys.dba_data_files@v_sid

    WHERE  file_id = v_file_id;

    return v_file_name;

END f_data_file;

But when compile I receive the errors:

ORA-04052: error occurred when looking up remote object SYS.DBA_DATA_FILES@V_SID

ORA-00604: error occurred at recursive SQL level 1