Re: ebtables among match bug

On Sat, 16 Apr 2005, Carl-Daniel Hailfinger wrote:

> Hi,
>
> everytime I try to use the "among" match extension, it explodes in my
> face with the following messages:
>
> # ebtables -t nat -A ipv4filter -i bridgeext0 --among-src 00:00:00:00:00:ff -j ACCEPT
>
> ebtables: among: wrong size: 1060against expected 1056, rounded to 1056
> kernel msg: ebtables bug: please report to author: match->check failed
>
> The reported sizes differ for different rules, but it is always 4 bytes
> bigger than expected.
>
> While trying to reproduce, I stumbled over another bug:
>
> # ebtables -t nat -A ipv4filter -i bridgeext0 --among-src 00:00:00:00:00:01 -j ACCEPT
>
> kernel msg: ebtables bug: please report to author: entries_size too small
>
> The machine in question is running kernel 2.6.11.7 on x86-64.

Thanks. The problem seem to be caused by integer types, which are defined
differently in user-space utility and in kernel (apparently 4-byte vs.
8-byte int), so there is a size mismatch.

Unfortunately, I don't have x86-64, so I cannot verify this. Would you be
so kind and try to replace all int by uint32_t in

include/linux/netfilter_bridge/ebt_among.h

and then recompile the kernel and the user-space utility? This should
work. Meanwhile, I'll update in CVS.

-- 
Grzes


-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click