You can bring up tcpproxy-go as (listen on 8000, proxy to 127.0.0.1:5000):
bin/tcpproxy-go proxy -b 127.0.0.1 -l 8000 127.0.0.1:5000
To test, you can use curl:
curl -vvv -H "Connection: close" http://localhost:8000/
Server:
iperf3 -s -B localhost -p 5000
Client:
iperf3 -c localhost -p 8000
The bpf/bpf.c file hardcodes ports 8000 for the proxy listener port and 5000 for the server listener port. Modify if you need different ports.
To use it, create a new cgroup test.slice and then add the shell you are going to run the tcpproxy in to it:
mkdir -p /sys/fs/cgroup/test.slice
echo $$ > /sys/fs/cgroup/test.slice/cgroup.procs
Now you can bring up tcpproxy-go in the shell that you added to the cgroup above (listen on port 8000, proxy to 127.0.0.1:5000):
bin/tcpproxy-go proxy -b 127.0.0.1 -l 8000 -e -c /sys/fs/cgroup/test.slice 127.0.0.1:5000
To disable BPF, remove the --ebpf or -e flag from the above tcpproxy-go command.