Ipsec - PF_KEY and set_policy

[aditya kiran]

Hi,
I was just trying to understand PF_KEY interface for ipsec settings. So,
setkey uses it to do that. but i could find another  system call -
ipsec_set_policy. Could any body let me know why there are two interfaces to
configure ipsec?
Thanks,
Aditya
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