help needed on developing Fire wall

Question

Hi All,

I am developing one firewall like kind application for my XP machine.

I am using pre WFP apis and hardly finding document on those api.

I am using PfAddFiltersToInterface to add the filter, it takes one parameter of kind PF_FILTER_DESCRIPTOR.

I wanted to know how to fill this structure and some more info on other apis

i have one firewall working for vista(Windows Filtering Platform) but needed for my XP and 2000 machine

Please help me by providing usefull documents and tips.

thanks in advance

vinayaka karjigi