{"id":17613760,"url":"https://github.com/patsaoglou/firewall","last_synced_at":"2026-02-07T22:32:00.181Z","repository":{"id":258008168,"uuid":"872203666","full_name":"patsaoglou/firewall","owner":"patsaoglou","description":"A simple firewall service utilizing netfilter hooks and proc pseudo files in the Linux Κernel space to block/log network 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planning to start in the summer when I was reading the Kernel Programming Book by Kaiwan N Billimoria which at the end I didn't work\n  on because of vacation and later in september because of workload.\n- Plans to continue working on it.\n\n# Initial system design\n![alt text](\u003c376097699-c16fdda7-16b7-4abd-9528-7ba243354fcf.drawio (1).jpg\u003e)\n\n# Resources\n- Kernel Programming Book by Kaiwan N Billimoria\n- Registering procfs entries: https://www.cs.cmu.edu/afs/grand.central.org/archive/twiki/pub/Main/SumitKumar/procfs-guide.pdf\n- NetFilterExample: [https://infosecwriteups.com/linux-kernel-communication-part-1-netfilter-hooks-15c07a5a5c4e](https://blogs.oracle.com/linux/post/introduction-to-netfilter)\n- Netfilter walkthrough: https://people.computing.clemson.edu/~westall/853/notes/netfilter.pdf\n- Deep dive in netfilter API applications : https://phrack.org/issues/61/13.html\n- Netlink examples: 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