IPSec on Linux Kernel

Hi,

I'm currently doing some research work and I thought that maybe you guys could help me out on this.
I'm currently trying to find where can I understand more about the IPSec implementation on the current Linux Kernel (2.6.22). I need to find where the AH calls are made so I can reroute those functions calls to an external module, for a safer AH generation.
It would be helpful to find the source code files where I can study the IPSec stack in detail, and reroute the function call.
Any hints on these topics?

Thanks in advance

Fabio Souto
Portugal

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