do and is done in four easy steps;
(see packet-rpc.c and search for tap for an example)
-1, We need tap.h so just add '#include "tap.h"' to the includes.
+1, We need tap.h so just add '#include "tap.h"' (preceded by packet.h) to
+the includes.
2, We need a tap handler so just add 'static int <protocol>_tap = -1;'