Use fake address instead of wireguard address

In case the route management feature is not supported 
then do not create unnecessary firewall and manager instances. 
This can happen if the nftables nor iptables is not available on the host OS.

- Move the error handling to upper layer
- Remove fake, useless implementations of interfaces
- Update go-iptables because In Docker the old version can not 
determine well the path of executable file
- update lib to 0.70

README.md

@@ -1,6 +1,6 @@
 <p align="center">
- <strong>:hatching_chick: New Release! Peer expiration.</strong>
-  <a href="https://github.com/netbirdio/netbird/releases">
+ <strong>:hatching_chick: New Release! Self-hosting in under 5 min.</strong>
+  <a href="https://github.com/netbirdio/netbird#quickstart-with-self-hosted-netbird">
        Learn more
      </a>   
 </p>
@@ -40,9 +40,13 @@
 
 **Connect.** NetBird creates a WireGuard-based overlay network that automatically connects your machines over an encrypted tunnel, leaving behind the hassle of opening ports, complex firewall rules, VPN gateways, and so forth.
 
-**Secure.** NetBird isolates every machine and device by applying granular access policies, while allowing you to manage them intuitively from a single place.
+**Secure.** NetBird enables secure remote access by applying granular access policies, while allowing you to manage them intuitively from a single place. Works universally on any infrastructure.
 
-**Key features:**
+### Secure peer-to-peer VPN with SSO and MFA in minutes
+
+https://user-images.githubusercontent.com/700848/197345890-2e2cded5-7b7a-436f-a444-94e80dd24f46.mov
+
+### Key features
 
 | Connectivity                             	                        | Management                                 	                             | Automation                                    	                            | Platforms    	                        |
 |-------------------------------------------------------------------|--------------------------------------------------------------------------|----------------------------------------------------------------------------|---------------------------------------|
@@ -57,10 +61,6 @@
 | 	                                                                 | <ul><li> - \[x] SSH access management </ul></li>                       	 | 	                                                                          | 	                                     |
 
 
-### Secure peer-to-peer VPN with SSO and MFA in minutes
-
-https://user-images.githubusercontent.com/700848/197345890-2e2cded5-7b7a-436f-a444-94e80dd24f46.mov
-
 ### Quickstart with NetBird Cloud
 
 - Download and install NetBird at [https://app.netbird.io/install](https://app.netbird.io/install)

client/Dockerfile

@@ -1,7 +1,5 @@
-FROM gcr.io/distroless/base:debug
+FROM alpine:3
+RUN apk add --no-cache ca-certificates iptables ip6tables
 ENV NB_FOREGROUND_MODE=true
-ENV PATH=/sbin:/usr/sbin:/bin:/usr/bin:/busybox
-SHELL ["/busybox/sh","-c"]
-RUN sed -i -E 's/(^root:.+)\/sbin\/nologin/\1\/busybox\/sh/g' /etc/passwd
 ENTRYPOINT [ "/go/bin/netbird","up"]
 COPY netbird /go/bin/netbird

client/android/client.go

@@ -55,7 +55,6 @@ type Client struct {
 	ctxCancelLock *sync.Mutex
 	deviceName    string
 	routeListener routemanager.RouteListener
-	onHostDnsFn   func([]string)
 }
 
 // NewClient instantiate a new Client
@@ -97,7 +96,30 @@ func (c *Client) Run(urlOpener URLOpener, dns *DNSList, dnsReadyListener DnsRead
 
 	// todo do not throw error in case of cancelled context
 	ctx = internal.CtxInitState(ctx)
-	c.onHostDnsFn = func([]string) {}
+	return internal.RunClientMobile(ctx, cfg, c.recorder, c.tunAdapter, c.iFaceDiscover, c.routeListener, dns.items, dnsReadyListener)
+}
+
+// RunWithoutLogin we apply this type of run function when the backed has been started without UI (i.e. after reboot).
+// In this case make no sense handle registration steps.
+func (c *Client) RunWithoutLogin(dns *DNSList, dnsReadyListener DnsReadyListener) error {
+	cfg, err := internal.UpdateOrCreateConfig(internal.ConfigInput{
+		ConfigPath: c.cfgFile,
+	})
+	if err != nil {
+		return err
+	}
+	c.recorder.UpdateManagementAddress(cfg.ManagementURL.String())
+
+	var ctx context.Context
+	//nolint
+	ctxWithValues := context.WithValue(context.Background(), system.DeviceNameCtxKey, c.deviceName)
+	c.ctxCancelLock.Lock()
+	ctx, c.ctxCancel = context.WithCancel(ctxWithValues)
+	defer c.ctxCancel()
+	c.ctxCancelLock.Unlock()
+
+	// todo do not throw error in case of cancelled context
+	ctx = internal.CtxInitState(ctx)
 	return internal.RunClientMobile(ctx, cfg, c.recorder, c.tunAdapter, c.iFaceDiscover, c.routeListener, dns.items, dnsReadyListener)
 }
 

client/internal/connect.go

@@ -179,8 +179,6 @@ func runClient(ctx context.Context, config *Config, statusRecorder *peer.Status,
 		log.Print("Netbird engine started, my IP is: ", peerConfig.Address)
 		state.Set(StatusConnected)
 
-		statusRecorder.ClientStart()
-
 		<-engineCtx.Done()
 		statusRecorder.ClientTeardown()
 
@@ -201,6 +199,7 @@ func runClient(ctx context.Context, config *Config, statusRecorder *peer.Status,
 		return nil
 	}
 
+	statusRecorder.ClientStart()
 	err = backoff.Retry(operation, backOff)
 	if err != nil {
 		log.Debugf("exiting client retry loop due to unrecoverable error: %s", err)

client/internal/dns/server.go

@@ -235,14 +235,13 @@ func (s *DefaultServer) applyConfiguration(update nbdns.Config) error {
 	s.updateLocalResolver(localRecords)
 	s.currentConfig = dnsConfigToHostDNSConfig(update, s.service.RuntimeIP(), s.service.RuntimePort())
 
-	hostUpdate := s.currentConfig
 	if s.service.RuntimePort() != defaultPort && !s.hostManager.supportCustomPort() {
 		log.Warnf("the DNS manager of this peer doesn't support custom port. Disabling primary DNS setup. " +
 			"Learn more at: https://netbird.io/docs/how-to-guides/nameservers#local-resolver")
-		hostUpdate.routeAll = false
+		s.currentConfig.routeAll = false
 	}
 
-	if err = s.hostManager.applyDNSConfig(hostUpdate); err != nil {
+	if err = s.hostManager.applyDNSConfig(s.currentConfig); err != nil {
 		log.Error(err)
 	}
 

client/internal/dns/service_listener.go

@@ -11,6 +11,8 @@ import (
 
 	"github.com/miekg/dns"
 	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/client/internal/ebpf"
 )
 
 const (
@@ -24,10 +26,12 @@ type serviceViaListener struct {
 	dnsMux            *dns.ServeMux
 	customAddr        *netip.AddrPort
 	server            *dns.Server
-	runtimeIP         string
-	runtimePort       int
+	fakeIP            string
+	listenIP          string
+	listenPort        int
 	listenerIsRunning bool
 	listenerFlagLock  sync.Mutex
+	ebpfService       ebpf.Manager
 }
 
 func newServiceViaListener(wgIface WGIface, customAddr *netip.AddrPort) *serviceViaListener {
@@ -43,6 +47,7 @@ func newServiceViaListener(wgIface WGIface, customAddr *netip.AddrPort) *service
 			UDPSize: 65535,
 		},
 	}
+
 	return s
 }
 
@@ -55,13 +60,22 @@ func (s *serviceViaListener) Listen() error {
 	}
 
 	var err error
-	s.runtimeIP, s.runtimePort, err = s.evalRuntimeAddress()
+	s.listenIP, s.listenPort, err = s.evalListenAddress()
 	if err != nil {
 		log.Errorf("failed to eval runtime address: %s", err)
 		return err
 	}
-	s.server.Addr = fmt.Sprintf("%s:%d", s.runtimeIP, s.runtimePort)
+	s.server.Addr = fmt.Sprintf("%s:%d", s.listenIP, s.listenPort)
 
+	if s.shouldApplyPortFwd() {
+		s.fakeIP = getLastIPFromNetwork(s.wgInterface.Address().Network, 1)
+		s.ebpfService = ebpf.GetEbpfManagerInstance()
+		err = s.ebpfService.LoadDNSFwd(s.fakeIP, s.listenIP, s.listenPort)
+		if err != nil {
+			log.Warnf("failed to load DNS port fwd, custom port may not support well: %s", err)
+			s.ebpfService = nil
+		}
+	}
 	log.Debugf("starting dns on %s", s.server.Addr)
 	go func() {
 		s.setListenerStatus(true)
@@ -69,9 +83,10 @@ func (s *serviceViaListener) Listen() error {
 
 		err := s.server.ListenAndServe()
 		if err != nil {
-			log.Errorf("dns server running with %d port returned an error: %v. Will not retry", s.runtimePort, err)
+			log.Errorf("dns server running with %d port returned an error: %v. Will not retry", s.listenPort, err)
 		}
 	}()
+
 	return nil
 }
 
@@ -90,6 +105,13 @@ func (s *serviceViaListener) Stop() {
 	if err != nil {
 		log.Errorf("stopping dns server listener returned an error: %v", err)
 	}
+
+	if s.ebpfService != nil {
+		err = s.ebpfService.FreeDNSFwd()
+		if err != nil {
+			log.Errorf("stopping traffic forwarder returned an error: %v", err)
+		}
+	}
 }
 
 func (s *serviceViaListener) RegisterMux(pattern string, handler dns.Handler) {
@@ -101,11 +123,25 @@ func (s *serviceViaListener) DeregisterMux(pattern string) {
 }
 
 func (s *serviceViaListener) RuntimePort() int {
-	return s.runtimePort
+	s.listenerFlagLock.Lock()
+	defer s.listenerFlagLock.Unlock()
+
+	if s.ebpfService != nil {
+		return defaultPort
+	} else {
+		return s.listenPort
+	}
 }
 
 func (s *serviceViaListener) RuntimeIP() string {
-	return s.runtimeIP
+	s.listenerFlagLock.Lock()
+	defer s.listenerFlagLock.Unlock()
+
+	if s.ebpfService != nil {
+		return s.fakeIP
+	} else {
+		return s.listenIP
+	}
 }
 
 func (s *serviceViaListener) setListenerStatus(running bool) {
@@ -136,10 +172,25 @@ func (s *serviceViaListener) getFirstListenerAvailable() (string, int, error) {
 	return "", 0, fmt.Errorf("unable to find an unused ip and port combination. IPs tested: %v and ports %v", ips, ports)
 }
 
-func (s *serviceViaListener) evalRuntimeAddress() (string, int, error) {
+func (s *serviceViaListener) evalListenAddress() (string, int, error) {
 	if s.customAddr != nil {
 		return s.customAddr.Addr().String(), int(s.customAddr.Port()), nil
 	}
 
 	return s.getFirstListenerAvailable()
 }
+
+func (s *serviceViaListener) shouldApplyPortFwd() bool {
+	if runtime.GOOS != "linux" {
+		return false
+	}
+
+	if s.customAddr != nil {
+		return false
+	}
+
+	if s.listenPort == defaultPort {
+		return false
+	}
+	return true
+}

client/internal/ebpf/bpf_bpfeb.go

@@ -54,13 +54,16 @@ type bpfSpecs struct {
 //
 // It can be passed ebpf.CollectionSpec.Assign.
 type bpfProgramSpecs struct {
-	NbWgProxy *ebpf.ProgramSpec `ebpf:"nb_wg_proxy"`
+	NbXdpProg *ebpf.ProgramSpec `ebpf:"nb_xdp_prog"`
 }
 
 // bpfMapSpecs contains maps before they are loaded into the kernel.
 //
 // It can be passed ebpf.CollectionSpec.Assign.
 type bpfMapSpecs struct {
+	NbFeatures           *ebpf.MapSpec `ebpf:"nb_features"`
+	NbMapDnsIp           *ebpf.MapSpec `ebpf:"nb_map_dns_ip"`
+	NbMapDnsPort         *ebpf.MapSpec `ebpf:"nb_map_dns_port"`
 	NbWgProxySettingsMap *ebpf.MapSpec `ebpf:"nb_wg_proxy_settings_map"`
 }
 
@@ -83,11 +86,17 @@ func (o *bpfObjects) Close() error {
 //
 // It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
 type bpfMaps struct {
+	NbFeatures           *ebpf.Map `ebpf:"nb_features"`
+	NbMapDnsIp           *ebpf.Map `ebpf:"nb_map_dns_ip"`
+	NbMapDnsPort         *ebpf.Map `ebpf:"nb_map_dns_port"`
 	NbWgProxySettingsMap *ebpf.Map `ebpf:"nb_wg_proxy_settings_map"`
 }
 
 func (m *bpfMaps) Close() error {
 	return _BpfClose(
+		m.NbFeatures,
+		m.NbMapDnsIp,
+		m.NbMapDnsPort,
 		m.NbWgProxySettingsMap,
 	)
 }
@@ -96,12 +105,12 @@ func (m *bpfMaps) Close() error {
 //
 // It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
 type bpfPrograms struct {
-	NbWgProxy *ebpf.Program `ebpf:"nb_wg_proxy"`
+	NbXdpProg *ebpf.Program `ebpf:"nb_xdp_prog"`
 }
 
 func (p *bpfPrograms) Close() error {
 	return _BpfClose(
-		p.NbWgProxy,
+		p.NbXdpProg,
 	)
 }
 

client/internal/ebpf/bpf_bpfel.go

@@ -54,13 +54,16 @@ type bpfSpecs struct {
 //
 // It can be passed ebpf.CollectionSpec.Assign.
 type bpfProgramSpecs struct {
-	NbWgProxy *ebpf.ProgramSpec `ebpf:"nb_wg_proxy"`
+	NbXdpProg *ebpf.ProgramSpec `ebpf:"nb_xdp_prog"`
 }
 
 // bpfMapSpecs contains maps before they are loaded into the kernel.
 //
 // It can be passed ebpf.CollectionSpec.Assign.
 type bpfMapSpecs struct {
+	NbFeatures           *ebpf.MapSpec `ebpf:"nb_features"`
+	NbMapDnsIp           *ebpf.MapSpec `ebpf:"nb_map_dns_ip"`
+	NbMapDnsPort         *ebpf.MapSpec `ebpf:"nb_map_dns_port"`
 	NbWgProxySettingsMap *ebpf.MapSpec `ebpf:"nb_wg_proxy_settings_map"`
 }
 
@@ -83,11 +86,17 @@ func (o *bpfObjects) Close() error {
 //
 // It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
 type bpfMaps struct {
+	NbFeatures           *ebpf.Map `ebpf:"nb_features"`
+	NbMapDnsIp           *ebpf.Map `ebpf:"nb_map_dns_ip"`
+	NbMapDnsPort         *ebpf.Map `ebpf:"nb_map_dns_port"`
 	NbWgProxySettingsMap *ebpf.Map `ebpf:"nb_wg_proxy_settings_map"`
 }
 
 func (m *bpfMaps) Close() error {
 	return _BpfClose(
+		m.NbFeatures,
+		m.NbMapDnsIp,
+		m.NbMapDnsPort,
 		m.NbWgProxySettingsMap,
 	)
 }
@@ -96,12 +105,12 @@ func (m *bpfMaps) Close() error {
 //
 // It can be passed to loadBpfObjects or ebpf.CollectionSpec.LoadAndAssign.
 type bpfPrograms struct {
-	NbWgProxy *ebpf.Program `ebpf:"nb_wg_proxy"`
+	NbXdpProg *ebpf.Program `ebpf:"nb_xdp_prog"`
 }
 
 func (p *bpfPrograms) Close() error {
 	return _BpfClose(
-		p.NbWgProxy,
+		p.NbXdpProg,
 	)
 }
 

client/internal/ebpf/dns_fwd_linux.go

@@ -0,0 +1,59 @@
+//go:build !android
+
+package ebpf
+
+import (
+	"encoding/binary"
+	"net"
+
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	mapKeyFakeIP  uint32 = 0
+	mapKeyDNSIP   uint32 = 1
+	mapKeyDNSPort uint32 = 2
+)
+
+func (tf *GeneralManager) LoadDNSFwd(fakeIp, dnsIp string, dnsPort int) error {
+	log.Debugf("load ebpf DNS forwarder: address: %s:%d", dnsIp, dnsPort)
+	tf.lock.Lock()
+	defer tf.lock.Unlock()
+
+	err := tf.loadXdp()
+	if err != nil {
+		return err
+	}
+
+	err = tf.bpfObjs.NbMapDnsIp.Put(mapKeyFakeIP, ip2int(fakeIp))
+	if err != nil {
+		return err
+	}
+
+	err = tf.bpfObjs.NbMapDnsIp.Put(mapKeyDNSIP, ip2int(dnsIp))
+	if err != nil {
+		return err
+	}
+
+	err = tf.bpfObjs.NbMapDnsPort.Put(mapKeyDNSPort, uint16(dnsPort))
+	if err != nil {
+		return err
+	}
+
+	tf.setFeatureFlag(featureFlagDnsForwarder)
+	err = tf.bpfObjs.NbFeatures.Put(mapKeyFeatures, tf.featureFlags)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (tf *GeneralManager) FreeDNSFwd() error {
+	log.Debugf("free ebpf DNS forwarder")
+	return tf.unsetFeatureFlag(featureFlagDnsForwarder)
+}
+
+func ip2int(ipString string) uint32 {
+	ip := net.ParseIP(ipString)
+	return binary.BigEndian.Uint32(ip.To4())
+}

client/internal/ebpf/manager.go

@@ -0,0 +1,8 @@
+package ebpf
+
+type Manager interface {
+	LoadDNSFwd(fakeIP, dnsIP string, dnsPort int) error
+	FreeDNSFwd() error
+	LoadWgProxy(proxyPort, wgPort int) error
+	FreeWGProxy() error
+}

client/internal/ebpf/manager_linux.go

@@ -0,0 +1,107 @@
+//go:build !android
+
+package ebpf
+
+import (
+	_ "embed"
+	"net"
+	"sync"
+
+	"github.com/cilium/ebpf/link"
+	"github.com/cilium/ebpf/rlimit"
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	mapKeyFeatures uint32 = 0
+
+	featureFlagWGProxy      = 0b00000001
+	featureFlagDnsForwarder = 0b00000010
+)
+
+var (
+	singleton     Manager
+	singletonLock = &sync.Mutex{}
+)
+
+// required packages libbpf-dev, libc6-dev-i386-amd64-cross
+
+//go:generate go run github.com/cilium/ebpf/cmd/bpf2go -cc clang-14 bpf src/prog.c -- -I /usr/x86_64-linux-gnu/include
+type GeneralManager struct {
+	lock         sync.Mutex
+	link         link.Link
+	featureFlags uint16
+	bpfObjs      bpfObjects
+}
+
+// GetEbpfManagerInstance return a static eBpf Manager instance
+func GetEbpfManagerInstance() Manager {
+	singletonLock.Lock()
+	defer singletonLock.Unlock()
+	if singleton != nil {
+		return singleton
+	}
+	singleton = &GeneralManager{}
+	return singleton
+}
+
+func (tf *GeneralManager) setFeatureFlag(feature uint16) {
+	tf.featureFlags = tf.featureFlags | feature
+}
+
+func (tf *GeneralManager) loadXdp() error {
+	if tf.link != nil {
+		return nil
+	}
+	// it required for Docker
+	err := rlimit.RemoveMemlock()
+	if err != nil {
+		return err
+	}
+
+	iFace, err := net.InterfaceByName("lo")
+	if err != nil {
+		return err
+	}
+
+	// load pre-compiled programs into the kernel.
+	err = loadBpfObjects(&tf.bpfObjs, nil)
+	if err != nil {
+		return err
+	}
+
+	tf.link, err = link.AttachXDP(link.XDPOptions{
+		Program:   tf.bpfObjs.NbXdpProg,
+		Interface: iFace.Index,
+	})
+
+	return err
+}
+
+func (tf *GeneralManager) unsetFeatureFlag(feature uint16) error {
+	tf.lock.Lock()
+	defer tf.lock.Unlock()
+	tf.featureFlags &^= feature
+
+	if tf.link == nil {
+		return nil
+	}
+
+	if tf.featureFlags == 0 {
+		return tf.close()
+	}
+
+	return tf.bpfObjs.NbFeatures.Put(mapKeyFeatures, tf.featureFlags)
+}
+
+func (tf *GeneralManager) close() error {
+	log.Debugf("detach ebpf program ")
+	err := tf.bpfObjs.Close()
+	if err != nil {
+		log.Warnf("failed to close eBpf objects: %s", err)
+	}
+
+	err = tf.link.Close()
+	tf.link = nil
+	return err
+}

client/internal/ebpf/manager_linux_test.go

@@ -0,0 +1,40 @@
+package ebpf
+
+import (
+	"testing"
+)
+
+func TestManager_setFeatureFlag(t *testing.T) {
+	mgr := GeneralManager{}
+	mgr.setFeatureFlag(featureFlagWGProxy)
+	if mgr.featureFlags != 1 {
+		t.Errorf("invalid faeture state")
+	}
+
+	mgr.setFeatureFlag(featureFlagDnsForwarder)
+	if mgr.featureFlags != 3 {
+		t.Errorf("invalid faeture state")
+	}
+}
+
+func TestManager_unsetFeatureFlag(t *testing.T) {
+	mgr := GeneralManager{}
+	mgr.setFeatureFlag(featureFlagWGProxy)
+	mgr.setFeatureFlag(featureFlagDnsForwarder)
+
+	err := mgr.unsetFeatureFlag(featureFlagWGProxy)
+	if err != nil {
+		t.Errorf("unexpected error: %s", err)
+	}
+	if mgr.featureFlags != 2 {
+		t.Errorf("invalid faeture state, expected: %d, got: %d", 2, mgr.featureFlags)
+	}
+
+	err = mgr.unsetFeatureFlag(featureFlagDnsForwarder)
+	if err != nil {
+		t.Errorf("unexpected error: %s", err)
+	}
+	if mgr.featureFlags != 0 {
+		t.Errorf("invalid faeture state, expected: %d, got: %d", 0, mgr.featureFlags)
+	}
+}

client/internal/ebpf/manager_nonlinux.go

@@ -0,0 +1,8 @@
+//go:build !linux || android
+
+package ebpf
+
+// GetEbpfManagerInstance return error because ebpf is not supported on all os
+func GetEbpfManagerInstance() Manager {
+	panic("unsupported os")
+}

client/internal/ebpf/src/dns_fwd.c

@@ -0,0 +1,75 @@
+
+const __u32 map_key_fake_ip = 0;
+const __u32 map_key_dns_ip = 1;
+const __u32 map_key_dns_port = 2;
+
+struct bpf_map_def SEC("maps") nb_map_dns_ip = {
+	.type = BPF_MAP_TYPE_ARRAY,
+	.key_size = sizeof(__u32),
+	.value_size = sizeof(__u32),
+	.max_entries = 10,
+};
+
+struct bpf_map_def SEC("maps") nb_map_dns_port = {
+	.type = BPF_MAP_TYPE_ARRAY,
+	.key_size = sizeof(__u32),
+	.value_size = sizeof(__u16),
+	.max_entries = 10,
+};
+
+__be32 fake_ip = 0;
+__be32 dns_ip = 0;
+__be16 dns_port = 0;
+
+// 13568 is 53 in big endian
+__be16 GENERAL_DNS_PORT = 13568;
+
+bool read_settings() {
+    __u32 *fake_ip_value;
+    __u32 *ip_value;
+    __u16 *port_value;
+
+    // read fake ip
+    fake_ip_value = bpf_map_lookup_elem(&nb_map_dns_ip, &map_key_fake_ip);
+    if(!fake_ip_value) {
+        return false;
+    }
+    fake_ip = htonl(*fake_ip_value);
+
+    // read dns ip
+    ip_value = bpf_map_lookup_elem(&nb_map_dns_ip, &map_key_dns_ip);
+    if(!ip_value) {
+        return false;
+    }
+    dns_ip = htonl(*ip_value);
+
+    // read dns port
+    port_value = bpf_map_lookup_elem(&nb_map_dns_port, &map_key_dns_port);
+    if (!port_value) {
+        return false;
+    }
+    dns_port = htons(*port_value);
+    return true;
+}
+
+int xdp_dns_fwd(struct iphdr  *ip, struct udphdr *udp) {
+    if (dns_port == 0) {
+        if(!read_settings()){
+            return XDP_PASS;
+        }
+    }
+
+    if (udp->dest == GENERAL_DNS_PORT && ip->daddr == fake_ip) {
+        udp->dest = dns_port;
+        ip->daddr = dns_ip;
+        return XDP_PASS;
+    }
+
+    if (udp->source == dns_port && ip->saddr == dns_ip) {
+        udp->source = GENERAL_DNS_PORT;
+        ip->saddr = fake_ip;
+        return XDP_PASS;
+    }
+
+    return XDP_PASS;
+}

client/internal/ebpf/src/prog.c

@@ -0,0 +1,66 @@
+#include <stdbool.h>
+#include <linux/if_ether.h> // ETH_P_IP
+#include <linux/udp.h>
+#include <linux/ip.h>
+#include <netinet/in.h>
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "dns_fwd.c"
+#include "wg_proxy.c"
+
+#define bpf_printk(fmt, ...)                                                   \
+  ({                                                                           \
+    char ____fmt[] = fmt;                                                      \
+    bpf_trace_printk(____fmt, sizeof(____fmt), ##__VA_ARGS__);                 \
+  })
+
+const __u16 flag_feature_wg_proxy = 0b01;
+const __u16 flag_feature_dns_fwd = 0b10;
+
+const __u32 map_key_features = 0;
+struct bpf_map_def SEC("maps") nb_features = {
+	.type = BPF_MAP_TYPE_ARRAY,
+	.key_size = sizeof(__u32),
+	.value_size = sizeof(__u16),
+	.max_entries = 10,
+};
+
+SEC("xdp")
+int nb_xdp_prog(struct xdp_md *ctx) {
+    __u16 *features;
+    features = bpf_map_lookup_elem(&nb_features, &map_key_features);
+    if (!features) {
+        return XDP_PASS;
+    }
+
+    void *data     = (void *)(long)ctx->data;
+    void *data_end = (void *)(long)ctx->data_end;
+    struct ethhdr *eth = data;
+    struct iphdr  *ip  = (data + sizeof(struct ethhdr));
+    struct udphdr *udp = (data + sizeof(struct ethhdr) + sizeof(struct iphdr));
+
+    // return early if not enough data
+    if (data + sizeof(struct ethhdr) + sizeof(struct iphdr) + sizeof(struct udphdr) > data_end){
+        return XDP_PASS;
+    }
+
+    // skip non IPv4 packages
+    if (eth->h_proto != htons(ETH_P_IP)) {
+       return XDP_PASS;
+    }
+
+    // skip non UPD packages
+    if (ip->protocol != IPPROTO_UDP) {
+       return XDP_PASS;
+    }
+
+    if (*features & flag_feature_dns_fwd) {
+        xdp_dns_fwd(ip, udp);
+    }
+
+    if (*features & flag_feature_wg_proxy) {
+        xdp_wg_proxy(ip, udp);
+    }
+    return XDP_PASS;
+}
+char _license[] SEC("license") = "GPL";

client/internal/ebpf/src/wg_proxy.c

@@ -0,0 +1,54 @@
+const __u32 map_key_proxy_port = 0;
+const __u32 map_key_wg_port = 1;
+
+struct bpf_map_def SEC("maps") nb_wg_proxy_settings_map = {
+	.type = BPF_MAP_TYPE_ARRAY,
+	.key_size = sizeof(__u32),
+	.value_size = sizeof(__u16),
+	.max_entries = 10,
+};
+
+__u16 proxy_port = 0;
+__u16 wg_port = 0;
+
+bool read_port_settings() {
+    __u16 *value;
+    value = bpf_map_lookup_elem(&nb_wg_proxy_settings_map, &map_key_proxy_port);
+    if (!value) {
+        return false;
+    }
+
+    proxy_port = *value;
+
+    value = bpf_map_lookup_elem(&nb_wg_proxy_settings_map, &map_key_wg_port);
+    if (!value) {
+        return false;
+    }
+    wg_port = htons(*value);
+
+    return true;
+}
+
+int xdp_wg_proxy(struct iphdr  *ip, struct udphdr *udp) {
+    if (proxy_port == 0 || wg_port == 0) {
+        if (!read_port_settings()){
+            return XDP_PASS;
+        }
+        bpf_printk("proxy port: %d, wg port: %d", proxy_port, wg_port);
+    }
+
+    // 2130706433 = 127.0.0.1
+    if (ip->daddr != htonl(2130706433)) {
+        return XDP_PASS;
+    }
+
+    if (udp->source != wg_port){
+        return XDP_PASS;
+    }
+
+    __be16 new_src_port = udp->dest;
+    __be16 new_dst_port = htons(proxy_port);
+    udp->dest = new_dst_port;
+    udp->source = new_src_port;
+	return XDP_PASS;
+}

client/internal/ebpf/wg_proxy_linux.go

@@ -0,0 +1,46 @@
+//go:build !android
+
+package ebpf
+
+import (
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	mapKeyProxyPort uint32 = 0
+	mapKeyWgPort    uint32 = 1
+)
+
+func (tf *GeneralManager) LoadWgProxy(proxyPort, wgPort int) error {
+	log.Debugf("load ebpf WG proxy")
+	tf.lock.Lock()
+	defer tf.lock.Unlock()
+
+	err := tf.loadXdp()
+	if err != nil {
+		return err
+	}
+
+	err = tf.bpfObjs.NbWgProxySettingsMap.Put(mapKeyProxyPort, uint16(proxyPort))
+	if err != nil {
+		return err
+	}
+
+	err = tf.bpfObjs.NbWgProxySettingsMap.Put(mapKeyWgPort, uint16(wgPort))
+	if err != nil {
+		return err
+	}
+
+	tf.setFeatureFlag(featureFlagWGProxy)
+	err = tf.bpfObjs.NbFeatures.Put(mapKeyFeatures, tf.featureFlags)
+	if err != nil {
+		return err
+	}
+	return nil
+
+}
+
+func (tf *GeneralManager) FreeWGProxy() error {
+	log.Debugf("free ebpf WG proxy")
+	return tf.unsetFeatureFlag(featureFlagWGProxy)
+}

client/internal/peer/notifier.go

@@ -61,7 +61,7 @@ func (n *notifier) clientStart() {
 	n.serverStateLock.Lock()
 	defer n.serverStateLock.Unlock()
 	n.currentClientState = true
-	n.lastNotification = stateConnected
+	n.lastNotification = stateConnecting
 	n.notify(n.lastNotification)
 }
 
@@ -114,7 +114,7 @@ func (n *notifier) calculateState(managementConn, signalConn bool) int {
 		return stateConnected
 	}
 
-	if !managementConn && !signalConn {
+	if !managementConn && !signalConn && !n.currentClientState {
 		return stateDisconnected
 	}
 

client/internal/routemanager/firewall_linux.go

@@ -27,14 +27,19 @@ func genKey(format string, input string) string {
 }
 
 // NewFirewall if supported, returns an iptables manager, otherwise returns a nftables manager
-func NewFirewall(parentCTX context.Context) firewallManager {
+func NewFirewall(parentCTX context.Context) (firewallManager, error) {
 	manager, err := newNFTablesManager(parentCTX)
 	if err == nil {
 		log.Debugf("nftables firewall manager will be used")
-		return manager
+		return manager, nil
 	}
-	log.Debugf("fallback to iptables firewall manager: %s", err)
-	return newIptablesManager(parentCTX)
+	fMgr, err := newIptablesManager(parentCTX)
+	if err != nil {
+		log.Debugf("failed to initialize iptables for root mgr: %s", err)
+		return nil, err
+	}
+	log.Debugf("iptables firewall manager will be used")
+	return fMgr, nil
 }
 
 func getInPair(pair routerPair) routerPair {

client/internal/routemanager/firewall_nonlinux.go

@@ -3,24 +3,12 @@
 
 package routemanager
 
-import "context"
+import (
+	"context"
+	"fmt"
+)
 
-type unimplementedFirewall struct{}
-
-func (unimplementedFirewall) RestoreOrCreateContainers() error {
-	return nil
-}
-func (unimplementedFirewall) InsertRoutingRules(pair routerPair) error {
-	return nil
-}
-func (unimplementedFirewall) RemoveRoutingRules(pair routerPair) error {
-	return nil
-}
-
-func (unimplementedFirewall) CleanRoutingRules() {
-}
-
-// NewFirewall returns an unimplemented Firewall manager
-func NewFirewall(parentCtx context.Context) firewallManager {
-	return unimplementedFirewall{}
+// NewFirewall returns a nil manager
+func NewFirewall(context.Context) (firewallManager, error) {
+	return nil, fmt.Errorf("firewall not supported on this OS")
 }

client/internal/routemanager/iptables_linux.go

@@ -49,14 +49,12 @@ type iptablesManager struct {
 	mux        sync.Mutex
 }
 
-func newIptablesManager(parentCtx context.Context) *iptablesManager {
-	ctx, cancel := context.WithCancel(parentCtx)
+func newIptablesManager(parentCtx context.Context) (*iptablesManager, error) {
 	ipv4Client, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
 	if err != nil {
-		log.Debugf("failed to initialize iptables for ipv4: %s", err)
+		return nil, err
 	} else if !isIptablesClientAvailable(ipv4Client) {
-		log.Infof("iptables is missing for ipv4")
-		ipv4Client = nil
+		return nil, fmt.Errorf("iptables is missing for ipv4")
 	}
 	ipv6Client, err := iptables.NewWithProtocol(iptables.ProtocolIPv6)
 	if err != nil {
@@ -66,13 +64,14 @@ func newIptablesManager(parentCtx context.Context) *iptablesManager {
 		ipv6Client = nil
 	}
 
+	ctx, cancel := context.WithCancel(parentCtx)
 	return &iptablesManager{
 		ctx:        ctx,
 		stop:       cancel,
 		ipv4Client: ipv4Client,
 		ipv6Client: ipv6Client,
 		rules:      make(map[string]map[string][]string),
-	}
+	}, nil
 }
 
 // CleanRoutingRules cleans existing iptables resources that we created by the agent
@@ -395,6 +394,10 @@ func (i *iptablesManager) insertRoutingRule(keyFormat, table, chain, jump string
 		ipVersion = ipv6
 	}
 
+	if iptablesClient == nil {
+		return fmt.Errorf("unable to insert iptables routing rules. Iptables client is not initialized")
+	}
+
 	ruleKey := genKey(keyFormat, pair.ID)
 	rule := genRuleSpec(jump, ruleKey, pair.source, pair.destination)
 	existingRule, found := i.rules[ipVersion][ruleKey]
@@ -459,6 +462,10 @@ func (i *iptablesManager) removeRoutingRule(keyFormat, table, chain string, pair
 		ipVersion = ipv6
 	}
 
+	if iptablesClient == nil {
+		return fmt.Errorf("unable to remove iptables routing rules. Iptables client is not initialized")
+	}
+
 	ruleKey := genKey(keyFormat, pair.ID)
 	existingRule, found := i.rules[ipVersion][ruleKey]
 	if found {

client/internal/routemanager/iptables_linux_test.go

@@ -16,7 +16,7 @@ func TestIptablesManager_RestoreOrCreateContainers(t *testing.T) {
 		t.SkipNow()
 	}
 
-	manager := newIptablesManager(context.TODO())
+	manager, _ := newIptablesManager(context.TODO())
 
 	defer manager.CleanRoutingRules()
 

client/internal/routemanager/manager.go

@@ -27,7 +27,7 @@ type DefaultManager struct {
 	stop           context.CancelFunc
 	mux            sync.Mutex
 	clientNetworks map[string]*clientNetwork
-	serverRouter   *serverRouter
+	serverRouter   serverRouter
 	statusRecorder *peer.Status
 	wgInterface    *iface.WGIface
 	pubKey         string
@@ -36,13 +36,17 @@ type DefaultManager struct {
 
 // NewManager returns a new route manager
 func NewManager(ctx context.Context, pubKey string, wgInterface *iface.WGIface, statusRecorder *peer.Status, initialRoutes []*route.Route) *DefaultManager {
-	mCTX, cancel := context.WithCancel(ctx)
+	serverRouter, err := newServerRouter(ctx, wgInterface)
+	if err != nil {
+		log.Errorf("server router is not supported: %s", err)
+	}
 
+	mCTX, cancel := context.WithCancel(ctx)
 	dm := &DefaultManager{
 		ctx:            mCTX,
 		stop:           cancel,
 		clientNetworks: make(map[string]*clientNetwork),
-		serverRouter:   newServerRouter(ctx, wgInterface),
+		serverRouter:   serverRouter,
 		statusRecorder: statusRecorder,
 		wgInterface:    wgInterface,
 		pubKey:         pubKey,
@@ -59,7 +63,9 @@ func NewManager(ctx context.Context, pubKey string, wgInterface *iface.WGIface,
 // Stop stops the manager watchers and clean firewall rules
 func (m *DefaultManager) Stop() {
 	m.stop()
-	m.serverRouter.cleanUp()
+	if m.serverRouter != nil {
+		m.serverRouter.cleanUp()
+	}
 	m.ctx = nil
 }
 
@@ -77,9 +83,12 @@ func (m *DefaultManager) UpdateRoutes(updateSerial uint64, newRoutes []*route.Ro
 
 		m.updateClientNetworks(updateSerial, newClientRoutesIDMap)
 		m.notifier.onNewRoutes(newClientRoutesIDMap)
-		err := m.serverRouter.updateRoutes(newServerRoutesMap)
-		if err != nil {
-			return err
+
+		if m.serverRouter != nil {
+			err := m.serverRouter.updateRoutes(newServerRoutesMap)
+			if err != nil {
+				return err
+			}
 		}
 
 		return nil

client/internal/routemanager/manager_test.go

@@ -30,7 +30,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 		inputInitRoutes               []*route.Route
 		inputRoutes                   []*route.Route
 		inputSerial                   uint64
-		shouldCheckServerRoutes       bool
 		serverRoutesExpected          int
 		clientNetworkWatchersExpected int
 	}{
@@ -87,7 +86,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 				},
 			},
 			inputSerial:                   1,
-			shouldCheckServerRoutes:       runtime.GOOS == "linux",
 			serverRoutesExpected:          2,
 			clientNetworkWatchersExpected: 0,
 		},
@@ -116,7 +114,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 				},
 			},
 			inputSerial:                   1,
-			shouldCheckServerRoutes:       runtime.GOOS == "linux",
 			serverRoutesExpected:          1,
 			clientNetworkWatchersExpected: 1,
 		},
@@ -174,25 +171,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 			inputSerial:                   1,
 			clientNetworkWatchersExpected: 0,
 		},
-		{
-			name: "No Server Routes Should Be Added To Non Linux",
-			inputRoutes: []*route.Route{
-				{
-					ID:          "a",
-					NetID:       "routeA",
-					Peer:        localPeerKey,
-					Network:     netip.MustParsePrefix("1.2.3.4/32"),
-					NetworkType: route.IPv4Network,
-					Metric:      9999,
-					Masquerade:  false,
-					Enabled:     true,
-				},
-			},
-			inputSerial:                   1,
-			shouldCheckServerRoutes:       runtime.GOOS != "linux",
-			serverRoutesExpected:          0,
-			clientNetworkWatchersExpected: 0,
-		},
 		{
 			name: "Remove 1 Client Route",
 			inputInitRoutes: []*route.Route{
@@ -335,7 +313,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 			},
 			inputRoutes:                   []*route.Route{},
 			inputSerial:                   1,
-			shouldCheckServerRoutes:       true,
 			serverRoutesExpected:          0,
 			clientNetworkWatchersExpected: 0,
 		},
@@ -384,7 +361,6 @@ func TestManagerUpdateRoutes(t *testing.T) {
 				},
 			},
 			inputSerial:                   1,
-			shouldCheckServerRoutes:       runtime.GOOS == "linux",
 			serverRoutesExpected:          2,
 			clientNetworkWatchersExpected: 1,
 		},
@@ -419,8 +395,9 @@ func TestManagerUpdateRoutes(t *testing.T) {
 
 			require.Len(t, routeManager.clientNetworks, testCase.clientNetworkWatchersExpected, "client networks size should match")
 
-			if testCase.shouldCheckServerRoutes {
-				require.Len(t, routeManager.serverRouter.routes, testCase.serverRoutesExpected, "server networks size should match")
+			if runtime.GOOS == "linux" {
+				sr := routeManager.serverRouter.(*defaultServerRouter)
+				require.Len(t, sr.routes, testCase.serverRoutesExpected, "server networks size should match")
 			}
 		})
 	}

client/internal/routemanager/server.go

@@ -0,0 +1,9 @@
+package routemanager
+
+import "github.com/netbirdio/netbird/route"
+
+type serverRouter interface {
+	updateRoutes(map[string]*route.Route) error
+	removeFromServerNetwork(*route.Route) error
+	cleanUp()
+}

client/internal/routemanager/server_android.go

@@ -2,20 +2,11 @@ package routemanager
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/netbirdio/netbird/iface"
-	"github.com/netbirdio/netbird/route"
 )
 
-type serverRouter struct {
+func newServerRouter(context.Context, *iface.WGIface) (serverRouter, error) {
+	return nil, fmt.Errorf("server route not supported on this os")
 }
-
-func newServerRouter(ctx context.Context, wgInterface *iface.WGIface) *serverRouter {
-	return &serverRouter{}
-}
-
-func (r *serverRouter) updateRoutes(routesMap map[string]*route.Route) error {
-	return nil
-}
-
-func (r *serverRouter) cleanUp() {}

client/internal/routemanager/server_nonandroid.go

@@ -13,7 +13,7 @@ import (
 	"github.com/netbirdio/netbird/route"
 )
 
-type serverRouter struct {
+type defaultServerRouter struct {
 	mux         sync.Mutex
 	ctx         context.Context
 	routes      map[string]*route.Route
@@ -21,16 +21,21 @@ type serverRouter struct {
 	wgInterface *iface.WGIface
 }
 
-func newServerRouter(ctx context.Context, wgInterface *iface.WGIface) *serverRouter {
-	return &serverRouter{
+func newServerRouter(ctx context.Context, wgInterface *iface.WGIface) (serverRouter, error) {
+	firewall, err := NewFirewall(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return &defaultServerRouter{
 		ctx:         ctx,
 		routes:      make(map[string]*route.Route),
-		firewall:    NewFirewall(ctx),
+		firewall:    firewall,
 		wgInterface: wgInterface,
-	}
+	}, nil
 }
 
-func (m *serverRouter) updateRoutes(routesMap map[string]*route.Route) error {
+func (m *defaultServerRouter) updateRoutes(routesMap map[string]*route.Route) error {
 	serverRoutesToRemove := make([]string, 0)
 
 	if len(routesMap) > 0 {
@@ -81,7 +86,7 @@ func (m *serverRouter) updateRoutes(routesMap map[string]*route.Route) error {
 	return nil
 }
 
-func (m *serverRouter) removeFromServerNetwork(route *route.Route) error {
+func (m *defaultServerRouter) removeFromServerNetwork(route *route.Route) error {
 	select {
 	case <-m.ctx.Done():
 		log.Infof("not removing from server network because context is done")
@@ -98,7 +103,7 @@ func (m *serverRouter) removeFromServerNetwork(route *route.Route) error {
 	}
 }
 
-func (m *serverRouter) addToServerNetwork(route *route.Route) error {
+func (m *defaultServerRouter) addToServerNetwork(route *route.Route) error {
 	select {
 	case <-m.ctx.Done():
 		log.Infof("not adding to server network because context is done")
@@ -115,6 +120,6 @@ func (m *serverRouter) addToServerNetwork(route *route.Route) error {
 	}
 }
 
-func (m *serverRouter) cleanUp() {
+func (m *defaultServerRouter) cleanUp() {
 	m.firewall.CleanRoutingRules()
 }

client/internal/stdnet/filter.go

@@ -20,7 +20,7 @@ func InterfaceFilter(disallowList []string) func(string) bool {
 
 		for _, s := range disallowList {
 			if strings.HasPrefix(iFace, s) {
-				log.Debugf("ignoring interface %s - it is not allowed", iFace)
+				log.Tracef("ignoring interface %s - it is not allowed", iFace)
 				return false
 			}
 		}

client/internal/wgproxy/ebpf/loader.go

@@ -1,84 +0,0 @@
-//go:build linux && !android
-
-package ebpf
-
-import (
-	_ "embed"
-	"net"
-
-	"github.com/cilium/ebpf/link"
-	"github.com/cilium/ebpf/rlimit"
-)
-
-const (
-	mapKeyProxyPort uint32 = 0
-	mapKeyWgPort    uint32 = 1
-)
-
-//go:generate go run github.com/cilium/ebpf/cmd/bpf2go -cc clang-14 bpf src/portreplace.c --
-
-// EBPF is a wrapper for eBPF program
-type EBPF struct {
-	link link.Link
-}
-
-// NewEBPF create new EBPF instance
-func NewEBPF() *EBPF {
-	return &EBPF{}
-}
-
-// Load load ebpf program
-func (l *EBPF) Load(proxyPort, wgPort int) error {
-	// it required for Docker
-	err := rlimit.RemoveMemlock()
-	if err != nil {
-		return err
-	}
-
-	ifce, err := net.InterfaceByName("lo")
-	if err != nil {
-		return err
-	}
-
-	// Load pre-compiled programs into the kernel.
-	objs := bpfObjects{}
-	err = loadBpfObjects(&objs, nil)
-	if err != nil {
-		return err
-	}
-	defer func() {
-		_ = objs.Close()
-	}()
-
-	err = objs.NbWgProxySettingsMap.Put(mapKeyProxyPort, uint16(proxyPort))
-	if err != nil {
-		return err
-	}
-
-	err = objs.NbWgProxySettingsMap.Put(mapKeyWgPort, uint16(wgPort))
-	if err != nil {
-		return err
-	}
-
-	defer func() {
-		_ = objs.NbWgProxySettingsMap.Close()
-	}()
-
-	l.link, err = link.AttachXDP(link.XDPOptions{
-		Program:   objs.NbWgProxy,
-		Interface: ifce.Index,
-	})
-	if err != nil {
-		return err
-	}
-
-	return err
-}
-
-// Free ebpf program
-func (l *EBPF) Free() error {
-	if l.link != nil {
-		return l.link.Close()
-	}
-	return nil
-}

client/internal/wgproxy/ebpf/loader_test.go

@@ -1,18 +0,0 @@
-//go:build linux
-
-package ebpf
-
-import (
-	"testing"
-)
-
-func Test_newEBPF(t *testing.T) {
-	ebpf := NewEBPF()
-	err := ebpf.Load(1234, 51892)
-	defer func() {
-		_ = ebpf.Free()
-	}()
-	if err != nil {
-		t.Errorf("%s", err)
-	}
-}

client/internal/wgproxy/ebpf/src/portreplace.c

@@ -1,90 +0,0 @@
-#include <stdbool.h>
-#include <linux/if_ether.h> // ETH_P_IP
-#include <linux/udp.h>
-#include <linux/ip.h>
-#include <netinet/in.h>
-#include <linux/bpf.h>
-#include <bpf/bpf_helpers.h>
-
-#define bpf_printk(fmt, ...)                                                   \
-  ({                                                                           \
-    char ____fmt[] = fmt;                                                      \
-    bpf_trace_printk(____fmt, sizeof(____fmt), ##__VA_ARGS__);                 \
-  })
-
-const __u32 map_key_proxy_port = 0;
-const __u32 map_key_wg_port = 1;
-
-struct bpf_map_def SEC("maps") nb_wg_proxy_settings_map = {
-	.type = BPF_MAP_TYPE_ARRAY,
-	.key_size = sizeof(__u32),
-	.value_size = sizeof(__u16),
-	.max_entries = 10,
-};
-
-__u16 proxy_port = 0;
-__u16 wg_port = 0;
-
-bool read_port_settings() {
-    __u16 *value;
-    value = bpf_map_lookup_elem(&nb_wg_proxy_settings_map, &map_key_proxy_port);
-    if(!value) {
-        return false;
-    }
-
-    proxy_port = *value;
-
-    value = bpf_map_lookup_elem(&nb_wg_proxy_settings_map, &map_key_wg_port);
-    if(!value) {
-        return false;
-    }
-    wg_port = *value;
-
-    return true;
-}
-
-SEC("xdp")
-int nb_wg_proxy(struct xdp_md *ctx) {
-    if(proxy_port == 0 || wg_port == 0) {
-        if(!read_port_settings()){
-            return XDP_PASS;
-        }
-        bpf_printk("proxy port: %d, wg port: %d", proxy_port, wg_port);
-    }
-
-	void *data     = (void *)(long)ctx->data;
-	void *data_end = (void *)(long)ctx->data_end;
-	struct ethhdr *eth = data;
-    struct iphdr  *ip   = (data + sizeof(struct ethhdr));
-    struct udphdr *udp = (data + sizeof(struct ethhdr) + sizeof(struct iphdr));
-
-    // return early if not enough data
-    if (data + sizeof(struct ethhdr) + sizeof(struct iphdr) + sizeof(struct udphdr) > data_end){
-        return XDP_PASS;
-    }
-
-    // skip non IPv4 packages
-    if (eth->h_proto != htons(ETH_P_IP)) {
-       return XDP_PASS;
-    }
-
-    if (ip->protocol != IPPROTO_UDP) {
-       return XDP_PASS;
-    }
-
-    // 2130706433 = 127.0.0.1
-    if (ip->daddr != htonl(2130706433)) {
-        return XDP_PASS;
-    }
-
-    if (udp->source != htons(wg_port)){
-        return XDP_PASS;
-    }
-
-    __be16 new_src_port = udp->dest;
-    __be16 new_dst_port = htons(proxy_port);
-    udp->dest = new_dst_port;
-    udp->source = new_src_port;
-	return XDP_PASS;
-}
-char _license[] SEC("license") = "GPL";

client/internal/wgproxy/proxy_ebpf.go

@@ -12,15 +12,14 @@ import (
 
 	"github.com/google/gopacket"
 	"github.com/google/gopacket/layers"
-
 	log "github.com/sirupsen/logrus"
 
-	ebpf2 "github.com/netbirdio/netbird/client/internal/wgproxy/ebpf"
+	"github.com/netbirdio/netbird/client/internal/ebpf"
 )
 
 // WGEBPFProxy definition for proxy with EBPF support
 type WGEBPFProxy struct {
-	ebpf              *ebpf2.EBPF
+	ebpfManager       ebpf.Manager
 	lastUsedPort      uint16
 	localWGListenPort int
 
@@ -36,7 +35,7 @@ func NewWGEBPFProxy(wgPort int) *WGEBPFProxy {
 	log.Debugf("instantiate ebpf proxy")
 	wgProxy := &WGEBPFProxy{
 		localWGListenPort: wgPort,
-		ebpf:              ebpf2.NewEBPF(),
+		ebpfManager:       ebpf.GetEbpfManagerInstance(),
 		lastUsedPort:      0,
 		turnConnStore:     make(map[uint16]net.Conn),
 	}
@@ -56,7 +55,7 @@ func (p *WGEBPFProxy) Listen() error {
 		return err
 	}
 
-	err = p.ebpf.Load(wgPorxyPort, p.localWGListenPort)
+	err = p.ebpfManager.LoadWgProxy(wgPorxyPort, p.localWGListenPort)
 	if err != nil {
 		return err
 	}
@@ -110,7 +109,7 @@ func (p *WGEBPFProxy) Free() error {
 		err1 = p.conn.Close()
 	}
 
-	err2 = p.ebpf.Free()
+	err2 = p.ebpfManager.FreeWGProxy()
 	if p.rawConn != nil {
 		err3 = p.rawConn.Close()
 	}

go.mod

@@ -31,7 +31,7 @@ require (
 	fyne.io/fyne/v2 v2.1.4
 	github.com/c-robinson/iplib v1.0.3
 	github.com/cilium/ebpf v0.10.0
-	github.com/coreos/go-iptables v0.6.0
+	github.com/coreos/go-iptables v0.7.0
 	github.com/creack/pty v1.1.18
 	github.com/eko/gocache/v3 v3.1.1
 	github.com/getlantern/systray v1.2.1

go.sum

@@ -131,8 +131,8 @@ github.com/containerd/typeurl v1.0.2/go.mod h1:9trJWW2sRlGub4wZJRTW83VtbOLS6hwcD
 github.com/coocood/freecache v1.2.1 h1:/v1CqMq45NFH9mp/Pt142reundeBM0dVUD3osQBeu/U=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-iptables v0.6.0 h1:is9qnZMPYjLd8LYqmm/qlE+wwEgJIkTYdhV3rfZo4jk=
-github.com/coreos/go-iptables v0.6.0/go.mod h1:Qe8Bv2Xik5FyTXwgIbLAnv2sWSBmvWdFETJConOQ//Q=
+github.com/coreos/go-iptables v0.7.0 h1:XWM3V+MPRr5/q51NuWSgU0fqMad64Zyxs8ZUoMsamr8=
+github.com/coreos/go-iptables v0.7.0/go.mod h1:Qe8Bv2Xik5FyTXwgIbLAnv2sWSBmvWdFETJConOQ//Q=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/go-systemd/v22 v22.0.0/go.mod h1:xO0FLkIi5MaZafQlIrOotqXZ90ih+1atmu1JpKERPPk=

iface/iface.go

@@ -112,7 +112,7 @@ func (w *WGIface) Close() error {
 	return w.tun.Close()
 }
 
-// SetFilter sets packet filters for the userspace impelemntation
+// SetFilter sets packet filters for the userspace implementation
 func (w *WGIface) SetFilter(filter PacketFilter) error {
 	w.mu.Lock()
 	defer w.mu.Unlock()