errors with ebtables 2.0.8-2 in dmesg (tried OpenWRT)

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I'm trying to do some DHCP/ARP filtering here on my little router
running OpenWRT svn-rev. 15336. When I'm trying to insert a rule
like this:

"ebtables -A INPUT --in-interface bat0 --protocol IPv4
--ip-protocol udp --ip-source-port 68 -j DROP"

then I get the following reply:

"The kernel doesn't support a certain ebtables extension, consider
recompiling your kernel or insmod the extension."

And in dmesg: "eb_tables: ip match: invalid size 32 != 28"

A rule like "ebtables -I INPUT --in-interface bat0 --protocol ARP
-j DROP" results in the dmesg output "eb_tables: standard target:
invalid size 8 != 4".

The error posted on this mailing-list seems to be similar:
http://osdir.com/ml/linux.network.bridge.ebtables.devel/2006-12/msg00001.html

Is this a bug in ebtables in general (or related to my OpenWRT
firmware)? Is ebtables an active project at the moment anyway?
Seems like the last bugfixes have been quite a long time ago. 
But as far as I know, I can't use iptables with physdev to filter
ARP for example.

Cheers, Linus

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