how to send SADB_ACQUIRE messages from kernel?

hi
iwas trying to use pfkey_acquire() to send SADB_ACQUIRE messages from
kernel, i have allocated a tdb type structure and passed it as parameter to
pfkey_acquire() . though the the printk;s in pfkey_acquire indicate that
the message is sent successfully, no processing is done by
process_pfkey_acquire() function i.e no IKE messages appear in the tcpdump
output.what could this mean?

my question is,  first,can i initiate ike this way from the kernel , and is
this supported in the version iam using.
secondly, do we need to have a SPD entry for the src and destination
addresses for which we are trying to initiate IKE.
iam using freeswan -1.91 with ipv6 support.


thanks and regards.
kausty