HTB_DIRECT (struct htb_class * );
It returns NULL if the packet should be dropped or -1 if the packet should be passed directly thru. In all other cases leaf class is returned. We allow direct class selection by classid in priority. The we examine filters in qdisc and in inner nodes (if higher filter points to the inner node). If we end up with classid MAJOR:0 we enqueue the skb into special internal fifo (direct). These packets then go directly thru. If we still
default leaf. It still unsuccessfull then finish and return direct queue.