[LARTC] Announcing Layer-7 Filter!

[Ethan Sommer <sommere@mathcs.carleton.edu>]

I'm pleased to announce the initial release of the linux Layer-7 Filter. 
We integrate into the existing Linux QoS code (with tc etc...) and use 
regular expressions to match and shape streams of data.

 From our web site ( http://l7-filter.sourceforge.net/ )

Our goal is go create a filter to classify packets based on application 
(or "layer 7") data. This means that will will be able to classify 
packets as HTTP, FTP, Gnucleus, etc, regardless of what port the 
services are run on. Our filter will complement existing filters that 
classify based on route, port numbers and so on.

...

Our project has three subparts:

   1. A patch to the Linux kernel. This code does the actual classification.
   2. A patch to the "tc" (traffic control) program. This program tells
      the kernel how to filter.
   3. A file with protocol definitions which tells the kernel what we
      mean when we say "HTTP". This file is fed to the kernel via /proc.

--- end of website quote ---

It currently works with the linux 2.5 kernel (we've done most of our 
testing on 2.5.58) but it should be easy to backport.

We currently have patterns for HTTP, FTP, POP3, IMAP, and (and I know 
this is the one you were waiting for) KaZaA!!

Please give it a try, let us know what you think (either through our 
sourceforge forums or by e-mailing me or this list.)  We would also love 
to have lots of community involvement building up a database of 
patterns. Anyone who has used tcpdump and regular expressions before 
should be able to create a new pattern in under 15 minutes.

You can find out more at http://l7-filter.sourceforge.net/

Thanks, and I hope you all find our work useful,

Ethan J. Sommer

Other Developers:
* Justin Levandoski
* Matt Strait

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