I love your UDP packet flow tool, kudos for making that! I've always wondered how packets move through an OS. Also interesting how many gotos I see all over the place, even though everyone says "goto is the devil". Then again maybe this code was written long before that "proverb" came into existence.

Since you mentioned you love that, I will mention this netfilter packet flowchart by Jan Engelhardt [1]

[1] https://en.wikipedia.org/wiki/File%3ANetfilter-packet-flow.s...