You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: firewall.go
    path of file: ./repos/nff-go/examples/firewall
    
    the code of the file until where you have to start completion: // Copyright 2017 Intel Corporation.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file
    
func main() {
	var err error
	outport := flag.Uint("outport", 1, "port for sender")
	inport := flag.Uint("inport", 0, "port for receiver")
	flag.Parse()

	// Initialize NFF-GO library at 8 cores by default
	config := flow.Config{
		CPUList: "0-7",
	}
	flow.CheckFatal(flow.SystemInit(&config))

	// Get filtering rules from access control file.
	l3Rules, err = packet.GetL3ACLFromTextTable("firewall.conf")
	flow.CheckFatal(err)

	// Receive packets from zero port. Receive queue will be added automatically.
	inputFlow, err := flow.SetReceiver(uint16(*inport))
	flow.CheckFatal(err)

	// Separate packet flow based on ACL.
	rejectFlow, err := flow.SetSeparator(inputFlow, l3Separator, nil)
	flow.CheckFatal(err)

	// Drop rejected packets.
	flow.CheckFatal(flow.SetStopper(rejectFlow))

	// Send accepted packets to first port. Send queue will be added automatically.
	flow.CheckFatal(flow.SetSender(inputFlow, uint16(*outport)))

	// Begin to process packets.
	flow.CheckFatal(flow.SystemStart())
}