isakmpd: named pipe or pf_key?

[Du Jinsong <jinsong_(_at_)_internetappliance_(_dot_)_com>]

Hi, the manual for isakmpd reads that it use a named pipe to communicate
with ipsec, but I also found pf_key codes in the isakmpd directory. Does
isakmpd use pf_key at all?

Thanks a lot!