IP range implementation given an IP address and subnet mask

[Andrej van der Zee <andrejvanderzee () gmail com>]

Hi,

I would like to implement an IP address range filter similar to the
BPF capture filter that takes an IP address and subnet mask (like in
"net 192.168.0.0 and mask 255.255.255.0"). What would be the best way
to calculate this in C? Or in which file can I find the BPF
implementation of this expression?

Cheers,
Andrej
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