about the ipsec stack

[Antonio José Espinoza Palenque]

About the new ipsec stack...

I'm used freeswan for ipsec/x509 vpns and worked well, however, there is 
a new ipsec implementation in the kernel 2.6...and... I'd like to know 
if the current kernel ipsec stack is freeswan, was ported from some *nix 
or is a completely new unprobed implementation.

I need to know it because I love linux but I want to be sure about the 
performance of the new ipsec stack.

Grettings Antonio :)