After VPN is enabled, the Internet cannot be accessed

[bloodspasm]

After VPN is enabled, the Internet cannot be accessed

[stonezhl]

@bloodspasm I think the reason is TCP packets are not handled in the codebase.

private func handleTCPPacket(_ packet: IPPacket) {
    // For now, for the sake of simplicity, TCP packets are not handled.
}

But based on the logs, the UDP for DNS is working.