The whole net code is highly optimized - in the sense that it is copied between different parts of the memory only twice - according to "Linux Network Internals" - all the way to userspace (correct? if i did not remember wrongly :-)). And if you want to intercept, many ways. One is to intercept right after the packets is received from the network card, which is the function net_rx_action(), and just before sending is net_tx_action(). Above that the packet will be reassembled/disassembled according to network protocols. Have fun.
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