A collection of notes and ramblings collected from a random walk through readings of various sorts. Made by @aakarsh.
In this post we trace the path of a packet from through the linux networking subsystem. We go from a breif overview from packet’s arrival at the network card to its final destination on a socket’s receive queue.
Here we try to describe the linux post system call from both the client and the device driver perspective. Implementing post system call can serve as a useful excercise in clarifying lots of introductory device driver and systems programming concepts.