Netfilter Queue project website
Install required packages (for Ubuntu 20.04):
apt-get install libnfnetlink-dev libnetfilter-queue-dev
Compile the test program:
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
make
Configure INPUT and OUTPUT rules to intercept packets to/from UDP port 5566 and send to netfilter queue 0:
iptables -A INPUT -p udp --dport 5566 -j NFQUEUE --queue-num 0 --queue-bypass
iptables -A OUTPUT -p udp --sport 5566 -j NFQUEUE --queue-num 0 --queue-bypass
Display current rules for INPUT/OUTPUT:
iptables -L INPUT
iptables -L OUTPUT
Remove previously configured rules:
iptables -D INPUT -p udp --dport 5566 -j NFQUEUE --queue-num 0
iptables -D OUTPUT -p udp --sport 5566 -j NFQUEUE --queue-num 0
Run:
build/nfq_test
Start test UDP server
nc -ul 0.0.0.0 5566
Send packets from other host:
nc -u <IP> 5566
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