I have a question about libpcap.
Can libpcap be used for packet filtering? If yes how?

Where does libpcap get  packets from? Is it directly
from network interface or after OS has done some
processing on it( i.e. after kernel, or networking
code of OS)? 
Can libpcap be used to block the packets coming in?
(i.e. can libpcap be used for packet filtering
firewall)


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