[Bridge] Information needed about bridge c code

Stephen Hemminger shemminger at osdl.org
Thu Feb 9 09:18:02 PST 2006

On Wed, 1 Feb 2006 10:31:07 +0100
Louis Croisez <louis.croisez at gmail.com> wrote:

> Hello,
> i need to write a little personal patch in the bridge code.
> For this patch, i need to know the original src and dst mac addresses
> of the packet incoming to the bridge. As i work on a brouter (some
> packets are bridged, some are routed based on ebtable rules), packets
> that are routed have their mac addresses modified by the IP stack).

At start of br_handle_frame, dst mac address in skb is as received on
wire. Call sequence is:

The skb on the pre-routing chain is actually after brouting but before
going through bridge forwarding.

> I put a software probe in br_input.c::br_handle_frame( ), but there,
> the dst mac address is already replaced by the bridge local mac
> address.
> My question is: where must i put the probe to get the original src and
> dst mac addresses? At the driver level? In the bridge, but where?
> Thx in advance.
> PS: please CC  to louis.croisezATgmail.com, because i am receiving the
> digest once per day.
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Stephen Hemminger <shemminger at osdl.org>
OSDL http://developer.osdl.org/~shemminger

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