IPFW divert with layer 2 interfaces

[Jake Guffey]

Hi:

I am working on a network appliance based on FreeBSD, IPFW, and Suricata. In the scenario that I'm developing for, I need to divert packets sent over a layer 2 bridge for IPS processing. After reinjection, IPFW passes this traffic back to FreeBSD for layer 3 forwarding. I would like to get this working for layer 2 forwarding across the bridge interface(s) involved.

I saw http://freebsd.1045724.n5.nabble.com/patch-RFC-allow-divert-from-layer-2-ipfw-e-g-bridge-td4008335.html from quite some time ago (2006), and that one of the responders said that he didn't want to commit layer 2 diversion support before layer 2 packet filtering hooks were put in place. To my understanding (please correct me if I'm wrong), the pfil hooks he was referring to are in place now.

Is there something I can do to help make this happen? I am very rusty with C and will probably not be much help coding, but anything else, I'd be glad to do. I suppose that I could give coding this support a shot, with (likely) a bit of hand-holding from you.

The company that I work for has allocated budget for consulting, so I would be glad to help fund development if that's an issue.

Thanks,
Jake Guffey
Network Security Engineer

eProtex
Network medical device security

5451 Lakeview Parkway S Drive
Indianapolis, Indiana 46268, USA
Mobile: 317-220-7100
jake.guffey at eprotex.com
www.eprotex.com