$MidnightBSD: src/share/examples/kld/khelp/README,v 1.1 2013/01/09 00:37:49 laffer1 Exp $

An example Khelp module which uses the helper hook points available in the TCP
stack to calculate a per-connection count of inbound and outbound packets when
the connection is in the established state. The code is verbosely documented in
an attempt to explain how everything fits together.
