Netgraph Virtual ATM/Harp driver

[Vincent Jardin]

Enclosed a link to a patch of the HARP stack and a Netgraph node that provides 
a Virtual Physical ATM driver for the HARP stack. It is usefull when you do 
not have an ATM board ;-) For example, it can be used to do ATM over UDP 
(what a crazy idea !!). See netgraph/regression/memory_leak.sh
For example, there is a non-regression test that shows that the HARP stack can 
support a dynamic attachment and detachment of the PIF.

http://vjardin.free.fr/harp/harp_20030421.tgz

Then, based on this VATMPIF, I have enhanced the atm tool in order to add PVC 
that supports CBR, VBR and UBR.

There are other features like debugging without recompiling the Kernel, 
tcpdump support on the NBMA interfaces, ... and bug fixes against a panic 
related to a old code of atm_if.c that were used to clean that addresses and 
the route tables.

The debugging supports uses the following sysctls:
          net.harp.atm.atm_debug: 0|1
          net.harp.atm.atm_dev_print: 0|1
          net.harp.atm.atm_print_data: 0|1
          net.harp.ip.ipatm_print: 0|1
          net.harp.spans.spanscls_print: 0|1
          net.harp.uni.uniarp_print: 0|1
          net.harp.uni.unisig_print_msg: 0|1|2

See the INSTALL file. This patch is based on FreeBSD 4.7, however it could be 
ported easily for all the releases of FreeBSD that supports both Netgraph and 
HARP.

I would be interesed in getting feedbacks about some new features or bugs. I 
could not test the UNI, neither the SPANS code yet.

Regards,
  Vincent