Messages in this thread | | | Date | Fri, 7 Dec 2001 19:44:49 +0100 | From | salinarl <> | Subject | Question about sniffers and linux |
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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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