CHAP Authentication with rlm_perl module

Dear all, i am using perl module, its working all like exec module but no doubt its increased the performance on high load. But i have some queries when i use CHAP authentication method with perl module. In CHAP authentication i can't verify the password with Cleartext-Password, right? That's why i set RADCHECK attribute Cleartext-Password="password" and after that freeradius verify them with authenticator and all. and if password doesn't matched than its return Reject. But if i want to accept those user ( who have wrong password ) with special disabled framed-ip than how can i?? Thanks all, Imdad