https://github.com/patsaoglou/firewall

A simple firewall service utilizing netfilter hooks and proc pseudo files in the Linux Κernel space to block/log network traffic
https://github.com/patsaoglou/firewall

firewall kernel-module linux linux-kernel lkm netfilter netfilter-hook networking operating-systems systems-programming thread

Last synced: about 1 month ago
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A simple firewall service utilizing netfilter hooks and proc pseudo files in the Linux Κernel space to block/log network traffic

• Host: GitHub
• URL: https://github.com/patsaoglou/firewall
• Owner: patsaoglou
• License: mit
• Created: 2024-10-14T02:47:47.000Z (over 1 year ago)
• Default Branch: master
• Last Pushed: 2025-01-22T11:43:52.000Z (about 1 year ago)
• Last Synced: 2025-04-30T16:31:12.909Z (11 months ago)
• Topics: firewall, kernel-module, linux, linux-kernel, lkm, netfilter, netfilter-hook, networking, operating-systems, systems-programming, thread
• Language: C
• Homepage:
• Size: 71.3 KB
• Stars: 2
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Firewall

- In this repository I share the source files of a project I was 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

  on because of vacation and later in september because of workload.

- Plans to continue working on it.

# Initial system design

![alt text](<376097699-c16fdda7-16b7-4abd-9528-7ba243354fcf.drawio (1).jpg>)

# Resources

- Kernel Programming Book by Kaiwan N Billimoria

- Registering procfs entries: https://www.cs.cmu.edu/afs/grand.central.org/archive/twiki/pub/Main/SumitKumar/procfs-guide.pdf

- NetFilterExample: [https://infosecwriteups.com/linux-kernel-communication-part-1-netfilter-hooks-15c07a5a5c4e](https://blogs.oracle.com/linux/post/introduction-to-netfilter)

- Netfilter walkthrough: https://people.computing.clemson.edu/~westall/853/notes/netfilter.pdf

- Deep dive in netfilter API applications : https://phrack.org/issues/61/13.html

- Netlink examples: https://github.com/mwarning/netlink-examples