This is a rust binding for libnetfilter_queue, a Linux library that allows userspace to make decisions on the destiny of packets.
Note: cargo test will fail unless run as root on a linux system with the
nfnetlink_queue module loaded.
The CAP_NET_ADMIN capability allows to run a userspace program without
root privileges: setcap 'cap_net_admin=+ep' target/debug/examples/exampleprogram