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SubjectPacket tapping
Is it possible to tap a packet and send it to a userlevel program
before it is sent to appropriate receive function (say ip_rcv()). The
user level program will give the packet back to the kernel for delivery
to appropriate receive function.
In short, is it possible to have a protocol stack (between layer 2 and
3) to be implemented in useland.

Is Tun/Tap driver useful here?

Thanks for all the help
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