[client] Refactor/iface pkg (#2646)

Refactor the flat code structure

client/iface/device/device_netstack.go

@@ -0,0 +1,120 @@
+//go:build !android
+// +build !android
+
+package device
+
+import (
+	"fmt"
+
+	"github.com/pion/transport/v3"
+	log "github.com/sirupsen/logrus"
+	"golang.zx2c4.com/wireguard/device"
+
+	"github.com/netbirdio/netbird/client/iface/bind"
+	"github.com/netbirdio/netbird/client/iface/configurer"
+	"github.com/netbirdio/netbird/client/iface/netstack"
+)
+
+type TunNetstackDevice struct {
+	name          string
+	address       WGAddress
+	port          int
+	key           string
+	mtu           int
+	listenAddress string
+	iceBind       *bind.ICEBind
+
+	device         *device.Device
+	filteredDevice *FilteredDevice
+	nsTun          *netstack.NetStackTun
+	udpMux         *bind.UniversalUDPMuxDefault
+	configurer     WGConfigurer
+}
+
+func NewNetstackDevice(name string, address WGAddress, wgPort int, key string, mtu int, transportNet transport.Net, listenAddress string, filterFn bind.FilterFn) *TunNetstackDevice {
+	return &TunNetstackDevice{
+		name:          name,
+		address:       address,
+		port:          wgPort,
+		key:           key,
+		mtu:           mtu,
+		listenAddress: listenAddress,
+		iceBind:       bind.NewICEBind(transportNet, filterFn),
+	}
+}
+
+func (t *TunNetstackDevice) Create() (WGConfigurer, error) {
+	log.Info("create netstack tun interface")
+	t.nsTun = netstack.NewNetStackTun(t.listenAddress, t.address.IP.String(), t.mtu)
+	tunIface, err := t.nsTun.Create()
+	if err != nil {
+		return nil, fmt.Errorf("error creating tun device: %s", err)
+	}
+	t.filteredDevice = newDeviceFilter(tunIface)
+
+	t.device = device.NewDevice(
+		t.filteredDevice,
+		t.iceBind,
+		device.NewLogger(wgLogLevel(), "[netbird] "),
+	)
+
+	t.configurer = configurer.NewUSPConfigurer(t.device, t.name)
+	err = t.configurer.ConfigureInterface(t.key, t.port)
+	if err != nil {
+		_ = tunIface.Close()
+		return nil, fmt.Errorf("error configuring interface: %s", err)
+	}
+
+	log.Debugf("device has been created: %s", t.name)
+	return t.configurer, nil
+}
+
+func (t *TunNetstackDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
+	if t.device == nil {
+		return nil, fmt.Errorf("device is not ready yet")
+	}
+
+	err := t.device.Up()
+	if err != nil {
+		return nil, err
+	}
+
+	udpMux, err := t.iceBind.GetICEMux()
+	if err != nil {
+		return nil, err
+	}
+	t.udpMux = udpMux
+	log.Debugf("netstack device is ready to use")
+	return udpMux, nil
+}
+
+func (t *TunNetstackDevice) UpdateAddr(WGAddress) error {
+	return nil
+}
+
+func (t *TunNetstackDevice) Close() error {
+	if t.configurer != nil {
+		t.configurer.Close()
+	}
+
+	if t.device != nil {
+		t.device.Close()
+	}
+
+	if t.udpMux != nil {
+		return t.udpMux.Close()
+	}
+	return nil
+}
+
+func (t *TunNetstackDevice) WgAddress() WGAddress {
+	return t.address
+}
+
+func (t *TunNetstackDevice) DeviceName() string {
+	return t.name
+}
+
+func (t *TunNetstackDevice) FilteredDevice() *FilteredDevice {
+	return t.filteredDevice
+}