Messages in this thread | | | From | (Alan Cox) | Subject | Re: Questions about Packet Filter | Date | Thu, 21 May 1998 00:30:30 +0100 (BST) |
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> Are the BPF devices capable of "intercept" packages passing through > them?
There are no BPF 'devices'. 2.1.x allows BPF filters on arbitary sockets BPF does not write packets just test them.
> I mean is it possible that after it intercepts the outgoing package it > can modify the package contents(e.g. destination port) and inject into > NIC? Or, modify the package contents when intercept the incoming > packages and poll them back to the higher level protocols or > applications?
Not trivially.
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