Kernel trace for packet flow

“There exists a device driver for each kind of NIC. Inside it, Linux will ALWAYS call a standard high level routing: “netif_rx [net/core/dev.c]”, which will controls what 3 level protocol the frame belong to, and it will call the right 3 level function (so we’ll use a pointer to the function to determine which is right).”

Link: http://www.tldp.org/HOWTO/KernelAnalysis-HOWTO-8.html

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