[client] Replace string to netip.Prefix (#3362)

Replace string to netip.Prefix

---------

Co-authored-by: Hakan Sariman <hknsrmn46@gmail.com>

client/iface/configurer/kernel_unix.go

@@ -43,13 +43,7 @@ func (c *KernelConfigurer) ConfigureInterface(privateKey string, port int) error
 	return nil
 }
 
-func (c *KernelConfigurer) UpdatePeer(peerKey string, allowedIps string, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error {
+func (c *KernelConfigurer) UpdatePeer(peerKey string, allowedIps []net.IPNet, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error {
-	// parse allowed ips
-	_, ipNet, err := net.ParseCIDR(allowedIps)
-	if err != nil {
-		return err
-	}
-
 	peerKeyParsed, err := wgtypes.ParseKey(peerKey)
 	if err != nil {
 		return err
@@ -58,7 +52,7 @@ func (c *KernelConfigurer) UpdatePeer(peerKey string, allowedIps string, keepAli
 		PublicKey:         peerKeyParsed,
 		ReplaceAllowedIPs: false,
 		// don't replace allowed ips, wg will handle duplicated peer IP
-		AllowedIPs:                  []net.IPNet{*ipNet},
+		AllowedIPs:                  allowedIps,
 		PersistentKeepaliveInterval: &keepAlive,
 		Endpoint:                    endpoint,
 		PresharedKey:                preSharedKey,

client/iface/configurer/usp.go

@@ -52,13 +52,7 @@ func (c *WGUSPConfigurer) ConfigureInterface(privateKey string, port int) error
 	return c.device.IpcSet(toWgUserspaceString(config))
 }
 
-func (c *WGUSPConfigurer) UpdatePeer(peerKey string, allowedIps string, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error {
+func (c *WGUSPConfigurer) UpdatePeer(peerKey string, allowedIps []net.IPNet, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error {
-	// parse allowed ips
-	_, ipNet, err := net.ParseCIDR(allowedIps)
-	if err != nil {
-		return err
-	}
-
 	peerKeyParsed, err := wgtypes.ParseKey(peerKey)
 	if err != nil {
 		return err
@@ -67,7 +61,7 @@ func (c *WGUSPConfigurer) UpdatePeer(peerKey string, allowedIps string, keepAliv
 		PublicKey:         peerKeyParsed,
 		ReplaceAllowedIPs: false,
 		// don't replace allowed ips, wg will handle duplicated peer IP
-		AllowedIPs:                  []net.IPNet{*ipNet},
+		AllowedIPs:                  allowedIps,
 		PersistentKeepaliveInterval: &keepAlive,
 		PresharedKey:                preSharedKey,
 		Endpoint:                    endpoint,

client/iface/device/interface.go

@@ -11,7 +11,7 @@ import (
 
 type WGConfigurer interface {
 	ConfigureInterface(privateKey string, port int) error
-	UpdatePeer(peerKey string, allowedIps string, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
+	UpdatePeer(peerKey string, allowedIps []net.IPNet, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
 	RemovePeer(peerKey string) error
 	AddAllowedIP(peerKey string, allowedIP string) error
 	RemoveAllowedIP(peerKey string, allowedIP string) error

client/iface/iface.go

@@ -3,6 +3,7 @@ package iface
 import (
 	"fmt"
 	"net"
+	"net/netip"
 	"sync"
 	"time"
 
@@ -112,12 +113,13 @@ func (w *WGIface) UpdateAddr(newAddr string) error {
 
 // UpdatePeer updates existing Wireguard Peer or creates a new one if doesn't exist
 // Endpoint is optional
-func (w *WGIface) UpdatePeer(peerKey string, allowedIps string, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error {
+func (w *WGIface) UpdatePeer(peerKey string, allowedIps []netip.Prefix, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error {
 	w.mu.Lock()
 	defer w.mu.Unlock()
 
+	netIPNets := prefixesToIPNets(allowedIps)
 	log.Debugf("updating interface %s peer %s, endpoint %s", w.tun.DeviceName(), peerKey, endpoint)
-	return w.configurer.UpdatePeer(peerKey, allowedIps, keepAlive, endpoint, preSharedKey)
+	return w.configurer.UpdatePeer(peerKey, netIPNets, keepAlive, endpoint, preSharedKey)
 }
 
 // RemovePeer removes a Wireguard Peer from the interface iface
@@ -250,3 +252,14 @@ func (w *WGIface) GetNet() *netstack.Net {
 
 	return w.tun.GetNet()
 }
+
+func prefixesToIPNets(prefixes []netip.Prefix) []net.IPNet {
+	ipNets := make([]net.IPNet, len(prefixes))
+	for i, prefix := range prefixes {
+		ipNets[i] = net.IPNet{
+			IP:   net.IP(prefix.Addr().AsSlice()),                     // Convert netip.Addr to net.IP
+			Mask: net.CIDRMask(prefix.Bits(), prefix.Addr().BitLen()), // Create subnet mask
+		}
+	}
+	return ipNets
+}

client/iface/iface_test.go

@@ -373,12 +373,12 @@ func Test_UpdatePeer(t *testing.T) {
 		t.Fatal(err)
 	}
 	keepAlive := 15 * time.Second
-	allowedIP := "10.99.99.10/32"
+	allowedIP := netip.MustParsePrefix("10.99.99.10/32")
 	endpoint, err := net.ResolveUDPAddr("udp", "127.0.0.1:9900")
 	if err != nil {
 		t.Fatal(err)
 	}
-	err = iface.UpdatePeer(peerPubKey, allowedIP, keepAlive, endpoint, nil)
+	err = iface.UpdatePeer(peerPubKey, []netip.Prefix{allowedIP}, keepAlive, endpoint, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -396,7 +396,7 @@ func Test_UpdatePeer(t *testing.T) {
 
 	var foundAllowedIP bool
 	for _, aip := range peer.AllowedIPs {
-		if aip.String() == allowedIP {
+		if aip.String() == allowedIP.String() {
 			foundAllowedIP = true
 			break
 		}
@@ -443,9 +443,8 @@ func Test_RemovePeer(t *testing.T) {
 		t.Fatal(err)
 	}
 	keepAlive := 15 * time.Second
-	allowedIP := "10.99.99.14/32"
+	allowedIP := netip.MustParsePrefix("10.99.99.14/32")
-
+	err = iface.UpdatePeer(peerPubKey, []netip.Prefix{allowedIP}, keepAlive, nil, nil)
-	err = iface.UpdatePeer(peerPubKey, allowedIP, keepAlive, nil, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -462,12 +461,12 @@ func Test_RemovePeer(t *testing.T) {
 
 func Test_ConnectPeers(t *testing.T) {
 	peer1ifaceName := fmt.Sprintf("utun%d", WgIntNumber+400)
-	peer1wgIP := "10.99.99.17/30"
+	peer1wgIP := netip.MustParsePrefix("10.99.99.17/30")
 	peer1Key, _ := wgtypes.GeneratePrivateKey()
 	peer1wgPort := 33100
 
 	peer2ifaceName := "utun500"
-	peer2wgIP := "10.99.99.18/30"
+	peer2wgIP := netip.MustParsePrefix("10.99.99.18/30")
 	peer2Key, _ := wgtypes.GeneratePrivateKey()
 	peer2wgPort := 33200
 
@@ -482,7 +481,7 @@ func Test_ConnectPeers(t *testing.T) {
 
 	optsPeer1 := WGIFaceOpts{
 		IFaceName:    peer1ifaceName,
-		Address:      peer1wgIP,
+		Address:      peer1wgIP.String(),
 		WGPort:       peer1wgPort,
 		WGPrivKey:    peer1Key.String(),
 		MTU:          DefaultMTU,
@@ -522,7 +521,7 @@ func Test_ConnectPeers(t *testing.T) {
 
 	optsPeer2 := WGIFaceOpts{
 		IFaceName:    peer2ifaceName,
-		Address:      peer2wgIP,
+		Address:      peer2wgIP.String(),
 		WGPort:       peer2wgPort,
 		WGPrivKey:    peer2Key.String(),
 		MTU:          DefaultMTU,
@@ -558,11 +557,11 @@ func Test_ConnectPeers(t *testing.T) {
 		}
 	}()
 
-	err = iface1.UpdatePeer(peer2Key.PublicKey().String(), peer2wgIP, keepAlive, peer2endpoint, nil)
+	err = iface1.UpdatePeer(peer2Key.PublicKey().String(), []netip.Prefix{peer2wgIP}, keepAlive, peer2endpoint, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
-	err = iface2.UpdatePeer(peer1Key.PublicKey().String(), peer1wgIP, keepAlive, peer1endpoint, nil)
+	err = iface2.UpdatePeer(peer1Key.PublicKey().String(), []netip.Prefix{peer1wgIP}, keepAlive, peer1endpoint, nil)
 	if err != nil {
 		t.Fatal(err)
 	}

client/internal/engine.go

@@ -527,15 +527,18 @@ func (e *Engine) modifyPeers(peersUpdate []*mgmProto.RemotePeerConfig) error {
 	var modified []*mgmProto.RemotePeerConfig
 	for _, p := range peersUpdate {
 		peerPubKey := p.GetWgPubKey()
-		if allowedIPs, ok := e.peerStore.AllowedIPs(peerPubKey); ok {
+		allowedIPs, ok := e.peerStore.AllowedIPs(peerPubKey)
-			if allowedIPs != strings.Join(p.AllowedIps, ",") {
+		if !ok {
-				modified = append(modified, p)
+			continue
-				continue
+		}
-			}
+		if !compareNetIPLists(allowedIPs, p.GetAllowedIps()) {
-			err := e.statusRecorder.UpdatePeerFQDN(peerPubKey, p.GetFqdn())
+			modified = append(modified, p)
-			if err != nil {
+			continue
-				log.Warnf("error updating peer's %s fqdn in the status recorder, got error: %v", peerPubKey, err)
+		}
-			}
+
+		err := e.statusRecorder.UpdatePeerFQDN(peerPubKey, p.GetFqdn())
+		if err != nil {
+			log.Warnf("error updating peer's %s fqdn in the status recorder, got error: %v", peerPubKey, err)
 		}
 	}
 
@@ -1103,34 +1106,45 @@ func (e *Engine) addNewPeers(peersUpdate []*mgmProto.RemotePeerConfig) error {
 // addNewPeer add peer if connection doesn't exist
 func (e *Engine) addNewPeer(peerConfig *mgmProto.RemotePeerConfig) error {
 	peerKey := peerConfig.GetWgPubKey()
-	peerIPs := peerConfig.GetAllowedIps()
+	peerIPs := make([]netip.Prefix, 0, len(peerConfig.GetAllowedIps()))
-	if _, ok := e.peerStore.PeerConn(peerKey); !ok {
+	if _, ok := e.peerStore.PeerConn(peerKey); ok {
-		conn, err := e.createPeerConn(peerKey, strings.Join(peerIPs, ","))
+		return nil
-		if err != nil {
-			return fmt.Errorf("create peer connection: %w", err)
-		}
-
-		if ok := e.peerStore.AddPeerConn(peerKey, conn); !ok {
-			conn.Close()
-			return fmt.Errorf("peer already exists: %s", peerKey)
-		}
-
-		if e.beforePeerHook != nil && e.afterPeerHook != nil {
-			conn.AddBeforeAddPeerHook(e.beforePeerHook)
-			conn.AddAfterRemovePeerHook(e.afterPeerHook)
-		}
-
-		err = e.statusRecorder.AddPeer(peerKey, peerConfig.Fqdn)
-		if err != nil {
-			log.Warnf("error adding peer %s to status recorder, got error: %v", peerKey, err)
-		}
-
-		conn.Open()
 	}
+
+	for _, ipString := range peerConfig.GetAllowedIps() {
+		allowedNetIP, err := netip.ParsePrefix(ipString)
+		if err != nil {
+			log.Errorf("failed to parse allowedIPS: %v", err)
+			return err
+		}
+		peerIPs = append(peerIPs, allowedNetIP)
+	}
+
+	conn, err := e.createPeerConn(peerKey, peerIPs)
+	if err != nil {
+		return fmt.Errorf("create peer connection: %w", err)
+	}
+
+	if ok := e.peerStore.AddPeerConn(peerKey, conn); !ok {
+		conn.Close()
+		return fmt.Errorf("peer already exists: %s", peerKey)
+	}
+
+	if e.beforePeerHook != nil && e.afterPeerHook != nil {
+		conn.AddBeforeAddPeerHook(e.beforePeerHook)
+		conn.AddAfterRemovePeerHook(e.afterPeerHook)
+	}
+
+	err = e.statusRecorder.AddPeer(peerKey, peerConfig.Fqdn)
+	if err != nil {
+		log.Warnf("error adding peer %s to status recorder, got error: %v", peerKey, err)
+	}
+
+	conn.Open()
 	return nil
 }
 
-func (e *Engine) createPeerConn(pubKey string, allowedIPs string) (*peer.Conn, error) {
+func (e *Engine) createPeerConn(pubKey string, allowedIPs []netip.Prefix) (*peer.Conn, error) {
 	log.Debugf("creating peer connection %s", pubKey)
 
 	wgConfig := peer.WgConfig{
@@ -1815,3 +1829,36 @@ func getInterfacePrefixes() ([]netip.Prefix, error) {
 
 	return prefixes, nberrors.FormatErrorOrNil(merr)
 }
+
+// compareNetIPLists compares a list of netip.Prefix with a list of strings.
+// return true if both lists are equal, false otherwise.
+func compareNetIPLists(list1 []netip.Prefix, list2 []string) bool {
+	if len(list1) != len(list2) {
+		return false
+	}
+
+	freq := make(map[string]int, len(list1))
+	for _, p := range list1 {
+		freq[p.String()]++
+	}
+
+	for _, s := range list2 {
+		p, err := netip.ParsePrefix(s)
+		if err != nil {
+			return false // invalid prefix in list2.
+		}
+		key := p.String()
+		if freq[key] == 0 {
+			return false
+		}
+		freq[key]--
+	}
+
+	// all counts should be zero if lists are equal.
+	for _, count := range freq {
+		if count != 0 {
+			return false
+		}
+	}
+	return true
+}

client/internal/engine_test.go

@@ -26,6 +26,7 @@ import (
 	"golang.zx2c4.com/wireguard/tun/netstack"
 
 	"github.com/netbirdio/management-integrations/integrations"
+
 	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/bind"
 	"github.com/netbirdio/netbird/client/iface/configurer"
@@ -77,7 +78,7 @@ type MockWGIface struct {
 	ToInterfaceFunc            func() *net.Interface
 	UpFunc                     func() (*bind.UniversalUDPMuxDefault, error)
 	UpdateAddrFunc             func(newAddr string) error
-	UpdatePeerFunc             func(peerKey string, allowedIps string, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
+	UpdatePeerFunc             func(peerKey string, allowedIps []netip.Prefix, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
 	RemovePeerFunc             func(peerKey string) error
 	AddAllowedIPFunc           func(peerKey string, allowedIP string) error
 	RemoveAllowedIPFunc        func(peerKey string, allowedIP string) error
@@ -128,7 +129,7 @@ func (m *MockWGIface) UpdateAddr(newAddr string) error {
 	return m.UpdateAddrFunc(newAddr)
 }
 
-func (m *MockWGIface) UpdatePeer(peerKey string, allowedIps string, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error {
+func (m *MockWGIface) UpdatePeer(peerKey string, allowedIps []netip.Prefix, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error {
 	return m.UpdatePeerFunc(peerKey, allowedIps, keepAlive, endpoint, preSharedKey)
 }
 
@@ -534,7 +535,7 @@ func TestEngine_UpdateNetworkMap(t *testing.T) {
 					t.Errorf("expecting Engine.peerConns to contain peer %s", p)
 				}
 				expectedAllowedIPs := strings.Join(p.AllowedIps, ",")
-				if conn.WgConfig().AllowedIps != expectedAllowedIPs {
+				if !compareNetIPLists(conn.WgConfig().AllowedIps, p.AllowedIps) {
 					t.Errorf("expecting peer %s to have AllowedIPs= %s, got %s", p.GetWgPubKey(),
 						expectedAllowedIPs, conn.WgConfig().AllowedIps)
 				}
@@ -1237,6 +1238,91 @@ func Test_CheckFilesEqual(t *testing.T) {
 	}
 }
 
+func TestCompareNetIPLists(t *testing.T) {
+	tests := []struct {
+		name     string
+		list1    []netip.Prefix
+		list2    []string
+		expected bool
+	}{
+		{
+			name:     "both empty",
+			list1:    []netip.Prefix{},
+			list2:    []string{},
+			expected: true,
+		},
+		{
+			name:     "single match ipv4",
+			list1:    []netip.Prefix{netip.MustParsePrefix("192.168.0.0/24")},
+			list2:    []string{"192.168.0.0/24"},
+			expected: true,
+		},
+		{
+			name:     "multiple match ipv4, different order",
+			list1:    []netip.Prefix{netip.MustParsePrefix("192.168.1.0/24"), netip.MustParsePrefix("10.0.0.0/8")},
+			list2:    []string{"10.0.0.0/8", "192.168.1.0/24"},
+			expected: true,
+		},
+		{
+			name:     "ipv4 mismatch due to extra element in list2",
+			list1:    []netip.Prefix{netip.MustParsePrefix("192.168.1.0/24")},
+			list2:    []string{"192.168.1.0/24", "10.0.0.0/8"},
+			expected: false,
+		},
+		{
+			name:     "ipv4 mismatch due to duplicate count",
+			list1:    []netip.Prefix{netip.MustParsePrefix("192.168.1.0/24"), netip.MustParsePrefix("192.168.1.0/24")},
+			list2:    []string{"192.168.1.0/24"},
+			expected: false,
+		},
+		{
+			name:     "invalid prefix in list2",
+			list1:    []netip.Prefix{netip.MustParsePrefix("192.168.1.0/24")},
+			list2:    []string{"invalid-prefix"},
+			expected: false,
+		},
+		{
+			name:     "ipv4 mismatch because different prefixes",
+			list1:    []netip.Prefix{netip.MustParsePrefix("192.168.1.0/24")},
+			list2:    []string{"10.0.0.0/8"},
+			expected: false,
+		},
+		{
+			name:     "single match ipv6",
+			list1:    []netip.Prefix{netip.MustParsePrefix("2001:db8::/32")},
+			list2:    []string{"2001:db8::/32"},
+			expected: true,
+		},
+		{
+			name:     "multiple match ipv6, different order",
+			list1:    []netip.Prefix{netip.MustParsePrefix("2001:db8::/32"), netip.MustParsePrefix("fe80::/10")},
+			list2:    []string{"fe80::/10", "2001:db8::/32"},
+			expected: true,
+		},
+		{
+			name:     "mixed ipv4 and ipv6 match",
+			list1:    []netip.Prefix{netip.MustParsePrefix("192.168.1.0/24"), netip.MustParsePrefix("2001:db8::/32")},
+			list2:    []string{"2001:db8::/32", "192.168.1.0/24"},
+			expected: true,
+		},
+		{
+			name:     "ipv6 mismatch with invalid prefix",
+			list1:    []netip.Prefix{netip.MustParsePrefix("2001:db8::/32")},
+			list2:    []string{"invalid-ipv6"},
+			expected: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := compareNetIPLists(tt.list1, tt.list2)
+			if result != tt.expected {
+				t.Errorf("compareNetIPLists(%v, %v) = %v; want %v", tt.list1, tt.list2, result, tt.expected)
+			}
+		})
+	}
+}
+
 func createEngine(ctx context.Context, cancel context.CancelFunc, setupKey string, i int, mgmtAddr string, signalAddr string) (*Engine, error) {
 	key, err := wgtypes.GeneratePrivateKey()
 	if err != nil {

client/internal/iface_common.go

@@ -2,6 +2,7 @@ package internal
 
 import (
 	"net"
+	"net/netip"
 	"time"
 
 	wgdevice "golang.zx2c4.com/wireguard/device"
@@ -24,7 +25,7 @@ type wgIfaceBase interface {
 	Up() (*bind.UniversalUDPMuxDefault, error)
 	UpdateAddr(newAddr string) error
 	GetProxy() wgproxy.Proxy
-	UpdatePeer(peerKey string, allowedIps string, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
+	UpdatePeer(peerKey string, allowedIps []netip.Prefix, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
 	RemovePeer(peerKey string) error
 	AddAllowedIP(peerKey string, allowedIP string) error
 	RemoveAllowedIP(peerKey string, allowedIP string) error

client/internal/peer/conn.go

@@ -5,9 +5,9 @@ import (
 	"fmt"
 	"math/rand"
 	"net"
+	"net/netip"
 	"os"
 	"runtime"
-	"strings"
 	"sync"
 	"time"
 
@@ -56,7 +56,7 @@ type WgConfig struct {
 	WgListenPort int
 	RemoteKey    string
 	WgInterface  WGIface
-	AllowedIps   string
+	AllowedIps   []netip.Prefix
 	PreSharedKey *wgtypes.Key
 }
 
@@ -91,11 +91,10 @@ type Conn struct {
 	statusRecorder *Status
 	signaler       *Signaler
 	relayManager   *relayClient.Manager
-	allowedIP      net.IP
 	handshaker     *Handshaker
 
 	onConnected    func(remoteWireGuardKey string, remoteRosenpassPubKey []byte, wireGuardIP string, remoteRosenpassAddr string)
-	onDisconnected func(remotePeer string, wgIP string)
+	onDisconnected func(remotePeer string)
 
 	statusRelay         *AtomicConnStatus
 	statusICE           *AtomicConnStatus
@@ -120,10 +119,8 @@ type Conn struct {
 // NewConn creates a new not opened Conn to the remote peer.
 // To establish a connection run Conn.Open
 func NewConn(engineCtx context.Context, config ConnConfig, statusRecorder *Status, signaler *Signaler, iFaceDiscover stdnet.ExternalIFaceDiscover, relayManager *relayClient.Manager, srWatcher *guard.SRWatcher, semaphore *semaphoregroup.SemaphoreGroup) (*Conn, error) {
-	allowedIP, _, err := net.ParseCIDR(config.WgConfig.AllowedIps)
+	if len(config.WgConfig.AllowedIps) == 0 {
-	if err != nil {
+		return nil, fmt.Errorf("allowed IPs is empty")
-		log.Errorf("failed to parse allowedIPS: %v", err)
-		return nil, err
 	}
 
 	ctx, ctxCancel := context.WithCancel(engineCtx)
@@ -137,7 +134,6 @@ func NewConn(engineCtx context.Context, config ConnConfig, statusRecorder *Statu
 		statusRecorder: statusRecorder,
 		signaler:       signaler,
 		relayManager:   relayManager,
-		allowedIP:      allowedIP,
 		statusRelay:    NewAtomicConnStatus(),
 		statusICE:      NewAtomicConnStatus(),
 		semaphore:      semaphore,
@@ -147,10 +143,11 @@ func NewConn(engineCtx context.Context, config ConnConfig, statusRecorder *Statu
 	conn.workerRelay = NewWorkerRelay(connLog, ctrl, config, conn, relayManager)
 
 	relayIsSupportedLocally := conn.workerRelay.RelayIsSupportedLocally()
-	conn.workerICE, err = NewWorkerICE(ctx, connLog, config, conn, signaler, iFaceDiscover, statusRecorder, relayIsSupportedLocally)
+	workerICE, err := NewWorkerICE(ctx, connLog, config, conn, signaler, iFaceDiscover, statusRecorder, relayIsSupportedLocally)
 	if err != nil {
 		return nil, err
 	}
+	conn.workerICE = workerICE
 
 	conn.handshaker = NewHandshaker(ctx, connLog, config, signaler, conn.workerICE, conn.workerRelay)
 
@@ -179,7 +176,7 @@ func (conn *Conn) Open() {
 
 	peerState := State{
 		PubKey:           conn.config.Key,
-		IP:               strings.Split(conn.config.WgConfig.AllowedIps, "/")[0],
+		IP:               conn.config.WgConfig.AllowedIps[0].Addr().String(),
 		ConnStatusUpdate: time.Now(),
 		ConnStatus:       StatusDisconnected,
 		Mux:              new(sync.RWMutex),
@@ -245,7 +242,7 @@ func (conn *Conn) Close() {
 	conn.freeUpConnID()
 
 	if conn.evalStatus() == StatusConnected && conn.onDisconnected != nil {
-		conn.onDisconnected(conn.config.WgConfig.RemoteKey, conn.config.WgConfig.AllowedIps)
+		conn.onDisconnected(conn.config.WgConfig.RemoteKey)
 	}
 
 	conn.setStatusToDisconnected()
@@ -276,7 +273,7 @@ func (conn *Conn) SetOnConnected(handler func(remoteWireGuardKey string, remoteR
 }
 
 // SetOnDisconnected sets a handler function to be triggered by Conn when a connection to a remote disconnected
-func (conn *Conn) SetOnDisconnected(handler func(remotePeer string, wgIP string)) {
+func (conn *Conn) SetOnDisconnected(handler func(remotePeer string)) {
 	conn.onDisconnected = handler
 }
 
@@ -601,7 +598,7 @@ func (conn *Conn) doOnConnected(remoteRosenpassPubKey []byte, remoteRosenpassAdd
 	}
 
 	if conn.onConnected != nil {
-		conn.onConnected(conn.config.Key, remoteRosenpassPubKey, conn.allowedIP.String(), remoteRosenpassAddr)
+		conn.onConnected(conn.config.Key, remoteRosenpassPubKey, conn.config.WgConfig.AllowedIps[0].Addr().String(), remoteRosenpassAddr)
 	}
 }
 
@@ -698,7 +695,7 @@ func (conn *Conn) freeUpConnID() {
 func (conn *Conn) newProxy(remoteConn net.Conn) (wgproxy.Proxy, error) {
 	conn.log.Debugf("setup proxied WireGuard connection")
 	udpAddr := &net.UDPAddr{
-		IP:   conn.allowedIP,
+		IP:   conn.config.WgConfig.AllowedIps[0].Addr().AsSlice(),
 		Port: conn.config.WgConfig.WgListenPort,
 	}
 
@@ -752,8 +749,8 @@ func (conn *Conn) setRelayedProxy(proxy wgproxy.Proxy) {
 }
 
 // AllowedIP returns the allowed IP of the remote peer
-func (conn *Conn) AllowedIP() net.IP {
+func (conn *Conn) AllowedIP() netip.Addr {
-	return conn.allowedIP
+	return conn.config.WgConfig.AllowedIps[0].Addr()
 }
 
 func isController(config ConnConfig) bool {

client/internal/peer/iface.go

@@ -2,15 +2,17 @@ package peer
 
 import (
 	"net"
+	"net/netip"
 	"time"
 
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+
 	"github.com/netbirdio/netbird/client/iface/configurer"
 	"github.com/netbirdio/netbird/client/iface/wgproxy"
-	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 )
 
 type WGIface interface {
-	UpdatePeer(peerKey string, allowedIps string, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
+	UpdatePeer(peerKey string, allowedIps []netip.Prefix, keepAlive time.Duration, endpoint *net.UDPAddr, preSharedKey *wgtypes.Key) error
 	RemovePeer(peerKey string) error
 	GetStats(peerKey string) (configurer.WGStats, error)
 	GetProxy() wgproxy.Proxy

client/internal/peerstore/store.go

@@ -1,7 +1,7 @@
 package peerstore
 
 import (
-	"net"
+	"net/netip"
 	"sync"
 
 	"golang.org/x/exp/maps"
@@ -46,18 +46,7 @@ func (s *Store) Remove(pubKey string) (*peer.Conn, bool) {
 	return p, true
 }
 
-func (s *Store) AllowedIPs(pubKey string) (string, bool) {
+func (s *Store) AllowedIPs(pubKey string) ([]netip.Prefix, bool) {
-	s.peerConnsMu.RLock()
-	defer s.peerConnsMu.RUnlock()
-
-	p, ok := s.peerConns[pubKey]
-	if !ok {
-		return "", false
-	}
-	return p.WgConfig().AllowedIps, true
-}
-
-func (s *Store) AllowedIP(pubKey string) (net.IP, bool) {
 	s.peerConnsMu.RLock()
 	defer s.peerConnsMu.RUnlock()
 
@@ -65,6 +54,17 @@ func (s *Store) AllowedIP(pubKey string) (net.IP, bool) {
 	if !ok {
 		return nil, false
 	}
+	return p.WgConfig().AllowedIps, true
+}
+
+func (s *Store) AllowedIP(pubKey string) (netip.Addr, bool) {
+	s.peerConnsMu.RLock()
+	defer s.peerConnsMu.RUnlock()
+
+	p, ok := s.peerConns[pubKey]
+	if !ok {
+		return netip.Addr{}, false
+	}
 	return p.AllowedIP(), true
 }
 

client/internal/rosenpass/manager.go

@@ -126,7 +126,7 @@ func (m *Manager) generateConfig() (rp.Config, error) {
 	return cfg, nil
 }
 
-func (m *Manager) OnDisconnected(peerKey string, wgIP string) {
+func (m *Manager) OnDisconnected(peerKey string) {
 	m.lock.Lock()
 	defer m.lock.Unlock()
 

client/internal/routemanager/dnsinterceptor/handler.go

@@ -3,7 +3,6 @@ package dnsinterceptor
 import (
 	"context"
 	"fmt"
-	"net"
 	"net/netip"
 	"strings"
 	"sync"
@@ -165,14 +164,14 @@ func (d *DnsInterceptor) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
 		Timeout: 5 * time.Second,
 		Net:     "udp",
 	}
-	upstream := fmt.Sprintf("%s:%d", upstreamIP, dnsfwd.ListenPort)
+	upstream := fmt.Sprintf("%s:%d", upstreamIP.String(), dnsfwd.ListenPort)
 	reply, _, err := client.ExchangeContext(context.Background(), r, upstream)
 
 	var answer []dns.RR
 	if reply != nil {
 		answer = reply.Answer
 	}
-	log.Tracef("upstream %s (%s) DNS response for domain=%s answers=%v", upstreamIP, peerKey, r.Question[0].Name, answer)
+	log.Tracef("upstream %s (%s) DNS response for domain=%s answers=%v", upstreamIP.String(), peerKey, r.Question[0].Name, answer)
 
 	if err != nil {
 		log.Errorf("failed to exchange DNS request with %s: %v", upstream, err)
@@ -201,10 +200,10 @@ func (d *DnsInterceptor) continueToNextHandler(w dns.ResponseWriter, r *dns.Msg,
 	}
 }
 
-func (d *DnsInterceptor) getUpstreamIP(peerKey string) (net.IP, error) {
+func (d *DnsInterceptor) getUpstreamIP(peerKey string) (netip.Addr, error) {
 	peerAllowedIP, exists := d.peerStore.AllowedIP(peerKey)
 	if !exists {
-		return nil, fmt.Errorf("peer connection not found for key: %s", peerKey)
+		return netip.Addr{}, fmt.Errorf("peer connection not found for key: %s", peerKey)
 	}
 	return peerAllowedIP, nil
 }