Re: [Bridge] Modifying All Packets passing through the bridge!

["Srinivas M.A." <srinivas.aji@gmail.com>]

You could probably use the solution that was given to an earlier
question on this list (Bridge with a tweak...). The message is
archived at https://lists.linux-foundation.org/pipermail/bridge/2008-October/006074.html
.

On Sat, Nov 8, 2008 at 4:50 PM, Fahim Akhter <akhter.fahim@hotmail.com> wrote:
> Hi Everyone,
>
> I am currently working on a Ethernet Link Encryptor (so its called). The
> concept is to have two Subnetworks connected together using two bridges and
> the middle lays the internet connection or another network. The bridge is
> meant for encryption. The ecryption module and ready and working (
> independantly ) , if one bridge is set to crypto the other is supposed to
> turn on automatically.
>
> In crypto mode you only accept packet modified by the other bridge the rest
> of the packets ( rest of the LANS/INTERNET) are supposed to be dropped. In
> order to acheive that , I have to modify all the packets passing through the
> bridge so the other bridge is able to recognise it.
>
> I was modifying the packets in net/bridge/br_forward.c should_deliver() but
> on the other end I only received ARP packets as modified. Than I switched
> over to net/bridge/br_input.c br_handle_frame() but encountring the same
> problem. And in the kernel log only a few packets appear. ( dmesg , I'm
> printing a message )
>
> I need to Modify all packets passing through the bridge ( in kernel ) . Any
> Ideas ?
>
> Thanks,
> Fahim Akhter
>
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