Network traffic filtering by developing a Linux kernel module

Network traffic filtering by developing a Linux kernel module

I am trying to make my own network traffic filter. To achieve this, I am
building a Linux kernel module using netfilter and getting access to all
the network packets. In order to filter these captured network packets I
need to use a separate program (*filter_prog*) which I have developed. The
output of this *filter_prog* determines whether the packet will be allowed
to go through or not.
My query is, how can I use this *filter_prog* in a kernel module?
Secondly, is the approach correct? or there is an alternative approach
which is more easy to implement and is fast.
Thanks for any help.