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SubjectQuestion about sniffers and linux
Hello to everyone,
I am new to kernel internals, and I would like to know how can a sniffer
read whole packets, I mean including the link layer header. In the receive
path, this happens, I think, in the net_rx_action(), but in the transmit
path?
I know that there is a function called dev_queue_xmit_nit() for this, but
how can a driver add a link layer header to a packet before this function
gets called? The hard_start_xmit() of the driver is, in fact, called after
the dev_queue_xmit_nit(), (in the function dev_queue_xmit() ).
I think I'm missing something important about the subject, but I hope someone
will answer me, anyway.
Thank you in advance,

Lanfranco

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