Writing custom policies

[Randeep]

Hi,

I have installled FreeRADIUS Version 2.1.12.

I want to give a particular user maximum usage of 30GB in a month. I have
enabled the counter.conf.

And the NAS is sending the interim updates to the radacct.

But where I can give this condition? to compare and respond with a
disconnect message?

I have to give this in policy.conf?

Or in pre-auth session? The thing is in the default radiusd.conf, I'm not
able to see this authorize,authentiate, accounting, pre-auth etc.

Is this some version specific?

Regards,
Randeep