iptables source code - SERP Analysis

https://www.netfilter.org/projects/iptables/index.html

https://github.com/cernekee/iptables

https://github.com/wertarbyte/iptables/blob/master/ip6tables.c

https://www.linuxfromscratch.org/blfs/view/git/postlfs/iptables.html

https://git.netfilter.org/iptables/

https://www.youtube.com/watch?v=YKC9ICPkjaI

https://android.googlesource.com/platform/external/iptables/%2B/master/iptables/iptables.c

https://www.iptables.org/downloads.html

https://www.digitalocean.com/community/tutorials/iptables-essentials-common-firewall-rules-and-commands

https://en.wikipedia.org/wiki/Iptables