Linux netfilter Hacking HOWTO

Rusty Russell and Harald Welte, mailing list netfilter@lists.samba.org

1. Introduction

• 1.1 What is netfilter?
• 1.2 What's wrong with what we had in 2.0 and 2.2?
• 1.3 Who are you?
• 1.4 Why does it crash?

2. Where Can I Get The Latest?

3. Netfilter Architecture

• 3.1 Netfilter Base
• 3.2 Packet Selection: IP Tables
• 3.3 Connection Tracking
• 3.4 Other Additions

4. Information for Programmers

• 4.1 Understanding ip_tables
• 4.2 Extending iptables
• 4.3 Understanding NAT
• 4.4 Extending Connection Tracking/NAT
• 4.5 Understanding Netfilter
• 4.6 Writing New Netfilter Modules
• 4.7 Packet Handling in Userspace

5. Translating 2.0 and 2.2 Packet Filter Modules

6. Netfilter Hooks for Tunnel Writers

7. The Test Suite

• 7.1 Writing a Test
• 7.2 Variables And Environment
• 7.3 Useful Tools
• 7.4