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Just some entries about what I have learned in my effort to write an open source network accelerator.

http://www.opennop.org
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Intercepting IP packets using Netfilter hooks

Posted 04-22-2010 at 10:26 PM by yaplej
Updated 04-22-2010 at 10:33 PM by yaplej
Netfilter hooks are very useful when you wish to intercept, and modify IP packets inside a kernel module.

One great thing about using Netfilter hooks over say dev_add_pack() is that the bad L2 frames, and bad IP packets get filtered out earlier in the network stack so you only deal with good packets.

Now the whole point of the Netfilter hook is to customize what the kernel does with the packets received by the system so here is an example hook function. It simply...
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