syscall.SO_REUSEPORT not available in net package

Question

I want to open multiple UDP sockets bound to the same port( say 8888). The different sockets will be bound to different vrfs in the system. What I understand is we need to set SO_REUSEPORT sockopts, but I don't see this available in net package of Go.

Could someone help how can I achieve this?

Answer 1

You could set SO_REUSEPORT through unix.SetsockoptInt

Sample codes

    lc := net.ListenConfig{
        Control: func(network, address string, c syscall.RawConn) error {
            var opErr error
            err := c.Control(func(fd uintptr) {
                opErr = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, unix.SO_REUSEPORT, 1)
            })
            if err != nil {
                return err
            }
            return opErr
        },
    }

    lp, err := lc.ListenPacket(context.Background(), "udp", UDPADDR)

    conn := lp.(*net.UDPConn)