Netfilter hooks, and the skb structure (sk_buff.h)
How to use Netfilter hooks written by Owen Klan, presents a general overview of Netfilter and covers the basics of kernel module development.
I also found a resource on the sk_buff structure, which holds packets passing through the network stack. You can find it here: skb – Linux network buffers
Categories: Kernel, LIBIPQ, Linux, Netfiliter