How to determine where bridged packets originally come from ?

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Hi all,

I ended up using raw packet sockets (ETH_P_ALL) with BPF filters attached
(binded on the bridge interface) to capture packets for the userspace
host.

Now having captured these packets from the bridge interface, how do I know
which interface (eth0, wifi0, ..) the packets were send from originally ?

Is there a handy solution to this without modifying the packet content ?

Please help me out I you got the answer down pat.

BR, Faruk

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