version: bump snapshot

Update the golang.org/x/sys/unix dependency and use the newly introduced
RTMGRP_* consts instead of using the corresponding RTNLGRP_* const to
create a mask.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

Makefile

@@ -10,7 +10,7 @@ MAKEFLAGS += --no-print-directory
 generate-version-and-build:
 	@export GIT_CEILING_DIRECTORIES="$(realpath $(CURDIR)/..)" && \
 	tag="$$(git describe --dirty 2>/dev/null)" && \
-	ver="$$(printf 'package device\nconst WireGuardGoVersion = "%s"\n' "$$tag")" && \
+	ver="$$(printf 'package device\nconst WireGuardGoVersion = "%s"\n' "$${tag#v}")" && \
 	[ "$$(cat device/version.go 2>/dev/null)" != "$$ver" ] && \
 	echo "$$ver" > device/version.go && \
 	git update-index --assume-unchanged device/version.go || true

README.md

@@ -18,7 +18,7 @@ To run wireguard-go without forking to the background, pass `-f` or `--foregroun
 $ wireguard-go -f wg0
 ```
 
-When an interface is running, you may use [`wg(8)`](https://git.zx2c4.com/WireGuard/about/src/tools/man/wg.8) to configure it, as well as the usual `ip(8)` and `ifconfig(8)` commands.
+When an interface is running, you may use [`wg(8)`](https://git.zx2c4.com/wireguard-tools/about/src/man/wg.8) to configure it, as well as the usual `ip(8)` and `ifconfig(8)` commands.
 
 To run with more logging you may set the environment variable `LOG_LEVEL=debug`.
 

device/boundif_windows.go

@@ -18,7 +18,7 @@ const (
 	sockoptIPV6_UNICAST_IF = 31
 )
 
-func (device *Device) BindSocketToInterface4(interfaceIndex uint32) error {
+func (device *Device) BindSocketToInterface4(interfaceIndex uint32, blackhole bool) error {
 	/* MSDN says for IPv4 this needs to be in net byte order, so that it's like an IP address with leading zeros. */
 	bytes := make([]byte, 4)
 	binary.BigEndian.PutUint32(bytes, interfaceIndex)
@@ -41,10 +41,11 @@ func (device *Device) BindSocketToInterface4(interfaceIndex uint32) error {
 	if err != nil {
 		return err
 	}
+	device.net.bind.(*nativeBind).blackhole4 = blackhole
 	return nil
 }
 
-func (device *Device) BindSocketToInterface6(interfaceIndex uint32) error {
+func (device *Device) BindSocketToInterface6(interfaceIndex uint32, blackhole bool) error {
 	sysconn, err := device.net.bind.(*nativeBind).ipv6.SyscallConn()
 	if err != nil {
 		return err
@@ -58,5 +59,6 @@ func (device *Device) BindSocketToInterface6(interfaceIndex uint32) error {
 	if err != nil {
 		return err
 	}
+	device.net.bind.(*nativeBind).blackhole6 = blackhole
 	return nil
 }

device/conn_default.go

@@ -21,8 +21,10 @@ import (
  */
 
 type nativeBind struct {
-	ipv4 *net.UDPConn
+	ipv4       *net.UDPConn
-	ipv6 *net.UDPConn
+	ipv6       *net.UDPConn
+	blackhole4 bool
+	blackhole6 bool
 }
 
 type NativeEndpoint net.UDPAddr
@@ -159,11 +161,17 @@ func (bind *nativeBind) Send(buff []byte, endpoint Endpoint) error {
 		if bind.ipv4 == nil {
 			return syscall.EAFNOSUPPORT
 		}
+		if bind.blackhole4 {
+			return nil
+		}
 		_, err = bind.ipv4.WriteToUDP(buff, (*net.UDPAddr)(nend))
 	} else {
 		if bind.ipv6 == nil {
 			return syscall.EAFNOSUPPORT
 		}
+		if bind.blackhole6 {
+			return nil
+		}
 		_, err = bind.ipv6.WriteToUDP(buff, (*net.UDPAddr)(nend))
 	}
 	return err

device/conn_linux.go

@@ -7,7 +7,7 @@
  * This implements userspace semantics of "sticky sockets", modeled after
  * WireGuard's kernelspace implementation. This is more or less a straight port
  * of the sticky-sockets.c example code:
- * https://git.zx2c4.com/WireGuard/tree/contrib/examples/sticky-sockets/sticky-sockets.c
+ * https://git.zx2c4.com/wireguard-tools/tree/contrib/sticky-sockets/sticky-sockets.c
  *
  * Currently there is no way to achieve this within the net package:
  * See e.g. https://github.com/golang/go/issues/17930
@@ -43,6 +43,7 @@ type IPv6Source struct {
 }
 
 type NativeEndpoint struct {
+	sync.Mutex
 	dst  [unsafe.Sizeof(unix.SockaddrInet6{})]byte
 	src  [unsafe.Sizeof(IPv6Source{})]byte
 	isV6 bool
@@ -117,7 +118,7 @@ func createNetlinkRouteSocket() (int, error) {
 	}
 	saddr := &unix.SockaddrNetlink{
 		Family: unix.AF_NETLINK,
-		Groups: uint32(1 << (unix.RTNLGRP_IPV4_ROUTE - 1)),
+		Groups: unix.RTMGRP_IPV4_ROUTE,
 	}
 	err = unix.Bind(sock, saddr)
 	if err != nil {
@@ -145,7 +146,7 @@ func CreateBind(port uint16, device *Device) (*nativeBind, uint16, error) {
 
 	go bind.routineRouteListener(device)
 
-	// attempt ipv6 bind, update port if succesful
+	// attempt ipv6 bind, update port if successful
 
 	bind.sock6, newPort, err = create6(port)
 	if err != nil {
@@ -157,7 +158,7 @@ func CreateBind(port uint16, device *Device) (*nativeBind, uint16, error) {
 		port = newPort
 	}
 
-	// attempt ipv4 bind, update port if succesful
+	// attempt ipv4 bind, update port if successful
 
 	bind.sock4, newPort, err = create4(port)
 	if err != nil {
@@ -482,7 +483,9 @@ func send4(sock int, end *NativeEndpoint, buff []byte) error {
 		},
 	}
 
+	end.Lock()
 	_, err := unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst4(), 0)
+	end.Unlock()
 
 	if err == nil {
 		return nil
@@ -493,7 +496,9 @@ func send4(sock int, end *NativeEndpoint, buff []byte) error {
 	if err == unix.EINVAL {
 		end.ClearSrc()
 		cmsg.pktinfo = unix.Inet4Pktinfo{}
+		end.Lock()
 		_, err = unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst4(), 0)
+		end.Unlock()
 	}
 
 	return err
@@ -522,7 +527,9 @@ func send6(sock int, end *NativeEndpoint, buff []byte) error {
 		cmsg.pktinfo.Ifindex = 0
 	}
 
+	end.Lock()
 	_, err := unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst6(), 0)
+	end.Unlock()
 
 	if err == nil {
 		return nil
@@ -533,7 +540,9 @@ func send6(sock int, end *NativeEndpoint, buff []byte) error {
 	if err == unix.EINVAL {
 		end.ClearSrc()
 		cmsg.pktinfo = unix.Inet6Pktinfo{}
+		end.Lock()
 		_, err = unix.SendmsgN(sock, buff, (*[unsafe.Sizeof(cmsg)]byte)(unsafe.Pointer(&cmsg))[:], end.dst6(), 0)
+		end.Unlock()
 	}
 
 	return err
@@ -541,7 +550,7 @@ func send6(sock int, end *NativeEndpoint, buff []byte) error {
 
 func receive4(sock int, buff []byte, end *NativeEndpoint) (int, error) {
 
-	// contruct message header
+	// construct message header
 
 	var cmsg struct {
 		cmsghdr unix.Cmsghdr
@@ -573,7 +582,7 @@ func receive4(sock int, buff []byte, end *NativeEndpoint) (int, error) {
 
 func receive6(sock int, buff []byte, end *NativeEndpoint) (int, error) {
 
-	// contruct message header
+	// construct message header
 
 	var cmsg struct {
 		cmsghdr unix.Cmsghdr

device/constants.go

@@ -12,7 +12,7 @@ import (
 /* Specification constants */
 
 const (
-	RekeyAfterMessages      = (1 << 64) - (1 << 16) - 1
+	RekeyAfterMessages      = (1 << 60)
 	RejectAfterMessages     = (1 << 64) - (1 << 4) - 1
 	RekeyAfterTime          = time.Second * 120
 	RekeyAttemptTime        = time.Second * 90

device/device.go

@@ -236,23 +236,11 @@ func (device *Device) SetPrivateKey(sk NoisePrivateKey) error {
 
 	// do static-static DH pre-computations
 
-	rmKey := device.staticIdentity.privateKey.IsZero()
-
 	expiredPeers := make([]*Peer, 0, len(device.peers.keyMap))
-	for key, peer := range device.peers.keyMap {
+	for _, peer := range device.peers.keyMap {
 		handshake := &peer.handshake
-
+		handshake.precomputedStaticStatic = device.staticIdentity.privateKey.sharedSecret(handshake.remoteStatic)
-		if rmKey {
+		expiredPeers = append(expiredPeers, peer)
-			handshake.precomputedStaticStatic = [NoisePublicKeySize]byte{}
-		} else {
-			handshake.precomputedStaticStatic = device.staticIdentity.privateKey.sharedSecret(handshake.remoteStatic)
-		}
-
-		if isZero(handshake.precomputedStaticStatic[:]) {
-			unsafeRemovePeer(device, peer, key)
-		} else {
-			expiredPeers = append(expiredPeers, peer)
-		}
 	}
 
 	for _, peer := range lockedPeers {

device/device_test.go

@@ -5,54 +5,212 @@
 
 package device
 
-/* Create two device instances and simulate full WireGuard interaction
- * without network dependencies
- */
-
 import (
+	"bufio"
 	"bytes"
+	"encoding/binary"
+	"io"
+	"net"
+	"os"
+	"strings"
 	"testing"
+	"time"
+
+	"golang.zx2c4.com/wireguard/tun"
 )
 
-func TestDevice(t *testing.T) {
+func TestTwoDevicePing(t *testing.T) {
-
+	// TODO(crawshaw): pick unused ports on localhost
-	// prepare tun devices for generating traffic
+	cfg1 := `private_key=481eb0d8113a4a5da532d2c3e9c14b53c8454b34ab109676f6b58c2245e37b58
-
+listen_port=53511
-	tun1 := newDummyTUN("tun1")
+replace_peers=true
-	tun2 := newDummyTUN("tun2")
+public_key=f70dbb6b1b92a1dde1c783b297016af3f572fef13b0abb16a2623d89a58e9725
-
+protocol_version=1
-	_ = tun1
+replace_allowed_ips=true
-	_ = tun2
+allowed_ip=1.0.0.2/32
-
+endpoint=127.0.0.1:53512`
-	// prepare endpoints
+	tun1 := NewChannelTUN()
-
+	dev1 := NewDevice(tun1.TUN(), NewLogger(LogLevelDebug, "dev1: "))
-	end1, err := CreateDummyEndpoint()
+	dev1.Up()
-	if err != nil {
+	defer dev1.Close()
-		t.Error("failed to create endpoint:", err.Error())
+	if err := dev1.IpcSetOperation(bufio.NewReader(strings.NewReader(cfg1))); err != nil {
-	}
-
-	end2, err := CreateDummyEndpoint()
-	if err != nil {
-		t.Error("failed to create endpoint:", err.Error())
-	}
-
-	_ = end1
-	_ = end2
-
-	// create binds
-
-}
-
-func randDevice(t *testing.T) *Device {
-	sk, err := newPrivateKey()
-	if err != nil {
 		t.Fatal(err)
 	}
-	tun := newDummyTUN("dummy")
+
-	logger := NewLogger(LogLevelError, "")
+	cfg2 := `private_key=98c7989b1661a0d64fd6af3502000f87716b7c4bbcf00d04fc6073aa7b539768
-	device := NewDevice(tun, logger)
+listen_port=53512
-	device.SetPrivateKey(sk)
+replace_peers=true
-	return device
+public_key=49e80929259cebdda4f322d6d2b1a6fad819d603acd26fd5d845e7a123036427
+protocol_version=1
+replace_allowed_ips=true
+allowed_ip=1.0.0.1/32
+endpoint=127.0.0.1:53511`
+	tun2 := NewChannelTUN()
+	dev2 := NewDevice(tun2.TUN(), NewLogger(LogLevelDebug, "dev2: "))
+	dev2.Up()
+	defer dev2.Close()
+	if err := dev2.IpcSetOperation(bufio.NewReader(strings.NewReader(cfg2))); err != nil {
+		t.Fatal(err)
+	}
+
+	t.Run("ping 1.0.0.1", func(t *testing.T) {
+		msg2to1 := ping(net.ParseIP("1.0.0.1"), net.ParseIP("1.0.0.2"))
+		tun2.Outbound <- msg2to1
+		select {
+		case msgRecv := <-tun1.Inbound:
+			if !bytes.Equal(msg2to1, msgRecv) {
+				t.Error("ping did not transit correctly")
+			}
+		case <-time.After(300 * time.Millisecond):
+			t.Error("ping did not transit")
+		}
+	})
+
+	t.Run("ping 1.0.0.2", func(t *testing.T) {
+		msg1to2 := ping(net.ParseIP("1.0.0.2"), net.ParseIP("1.0.0.1"))
+		tun1.Outbound <- msg1to2
+		select {
+		case msgRecv := <-tun2.Inbound:
+			if !bytes.Equal(msg1to2, msgRecv) {
+				t.Error("return ping did not transit correctly")
+			}
+		case <-time.After(300 * time.Millisecond):
+			t.Error("return ping did not transit")
+		}
+	})
+}
+
+func ping(dst, src net.IP) []byte {
+	localPort := uint16(1337)
+	seq := uint16(0)
+
+	payload := make([]byte, 4)
+	binary.BigEndian.PutUint16(payload[0:], localPort)
+	binary.BigEndian.PutUint16(payload[2:], seq)
+
+	return genICMPv4(payload, dst, src)
+}
+
+// checksum is the "internet checksum" from https://tools.ietf.org/html/rfc1071.
+func checksum(buf []byte, initial uint16) uint16 {
+	v := uint32(initial)
+	for i := 0; i < len(buf)-1; i += 2 {
+		v += uint32(binary.BigEndian.Uint16(buf[i:]))
+	}
+	if len(buf)%2 == 1 {
+		v += uint32(buf[len(buf)-1]) << 8
+	}
+	for v > 0xffff {
+		v = (v >> 16) + (v & 0xffff)
+	}
+	return ^uint16(v)
+}
+
+func genICMPv4(payload []byte, dst, src net.IP) []byte {
+	const (
+		icmpv4ProtocolNumber = 1
+		icmpv4Echo           = 8
+		icmpv4ChecksumOffset = 2
+		icmpv4Size           = 8
+		ipv4Size             = 20
+		ipv4TotalLenOffset   = 2
+		ipv4ChecksumOffset   = 10
+		ttl                  = 65
+	)
+
+	hdr := make([]byte, ipv4Size+icmpv4Size)
+
+	ip := hdr[0:ipv4Size]
+	icmpv4 := hdr[ipv4Size : ipv4Size+icmpv4Size]
+
+	// https://tools.ietf.org/html/rfc792
+	icmpv4[0] = icmpv4Echo // type
+	icmpv4[1] = 0          // code
+	chksum := ^checksum(icmpv4, checksum(payload, 0))
+	binary.BigEndian.PutUint16(icmpv4[icmpv4ChecksumOffset:], chksum)
+
+	// https://tools.ietf.org/html/rfc760 section 3.1
+	length := uint16(len(hdr) + len(payload))
+	ip[0] = (4 << 4) | (ipv4Size / 4)
+	binary.BigEndian.PutUint16(ip[ipv4TotalLenOffset:], length)
+	ip[8] = ttl
+	ip[9] = icmpv4ProtocolNumber
+	copy(ip[12:], src.To4())
+	copy(ip[16:], dst.To4())
+	chksum = ^checksum(ip[:], 0)
+	binary.BigEndian.PutUint16(ip[ipv4ChecksumOffset:], chksum)
+
+	var v []byte
+	v = append(v, hdr...)
+	v = append(v, payload...)
+	return []byte(v)
+}
+
+// TODO(crawshaw): find a reusable home for this. package devicetest?
+type ChannelTUN struct {
+	Inbound  chan []byte // incoming packets, closed on TUN close
+	Outbound chan []byte // outbound packets, blocks forever on TUN close
+
+	closed chan struct{}
+	events chan tun.Event
+	tun    chTun
+}
+
+func NewChannelTUN() *ChannelTUN {
+	c := &ChannelTUN{
+		Inbound:  make(chan []byte),
+		Outbound: make(chan []byte),
+		closed:   make(chan struct{}),
+		events:   make(chan tun.Event, 1),
+	}
+	c.tun.c = c
+	c.events <- tun.EventUp
+	return c
+}
+
+func (c *ChannelTUN) TUN() tun.Device {
+	return &c.tun
+}
+
+type chTun struct {
+	c *ChannelTUN
+}
+
+func (t *chTun) File() *os.File { return nil }
+
+func (t *chTun) Read(data []byte, offset int) (int, error) {
+	select {
+	case <-t.c.closed:
+		return 0, io.EOF // TODO(crawshaw): what is the correct error value?
+	case msg := <-t.c.Outbound:
+		return copy(data[offset:], msg), nil
+	}
+}
+
+// Write is called by the wireguard device to deliver a packet for routing.
+func (t *chTun) Write(data []byte, offset int) (int, error) {
+	if offset == -1 {
+		close(t.c.closed)
+		close(t.c.events)
+		return 0, io.EOF
+	}
+	msg := make([]byte, len(data)-offset)
+	copy(msg, data[offset:])
+	select {
+	case <-t.c.closed:
+		return 0, io.EOF // TODO(crawshaw): what is the correct error value?
+	case t.c.Inbound <- msg:
+		return len(data) - offset, nil
+	}
+}
+
+func (t *chTun) Flush() error           { return nil }
+func (t *chTun) MTU() (int, error)      { return DefaultMTU, nil }
+func (t *chTun) Name() (string, error)  { return "loopbackTun1", nil }
+func (t *chTun) Events() chan tun.Event { return t.c.events }
+func (t *chTun) Close() error {
+	t.Write(nil, -1)
+	return nil
 }
 
 func assertNil(t *testing.T, err error) {
@@ -66,3 +224,15 @@ func assertEqual(t *testing.T, a, b []byte) {
 		t.Fatal(a, "!=", b)
 	}
 }
+
+func randDevice(t *testing.T) *Device {
+	sk, err := newPrivateKey()
+	if err != nil {
+		t.Fatal(err)
+	}
+	tun := newDummyTUN("dummy")
+	logger := NewLogger(LogLevelError, "")
+	device := NewDevice(tun, logger)
+	device.SetPrivateKey(sk)
+	return device
+}

device/noise-protocol.go

@@ -39,13 +39,13 @@ const (
 )
 
 const (
-	MessageInitiationSize      = 148                                           // size of handshake initation message
+	MessageInitiationSize      = 148                                           // size of handshake initiation message
 	MessageResponseSize        = 92                                            // size of response message
 	MessageCookieReplySize     = 64                                            // size of cookie reply message
-	MessageTransportHeaderSize = 16                                            // size of data preceeding content in transport message
+	MessageTransportHeaderSize = 16                                            // size of data preceding content in transport message
 	MessageTransportSize       = MessageTransportHeaderSize + poly1305.TagSize // size of empty transport
 	MessageKeepaliveSize       = MessageTransportSize                          // size of keepalive
-	MessageHandshakeSize       = MessageInitiationSize                         // size of largest handshake releated message
+	MessageHandshakeSize       = MessageInitiationSize                         // size of largest handshake related message
 )
 
 const (
@@ -154,6 +154,7 @@ func init() {
 }
 
 func (device *Device) CreateMessageInitiation(peer *Peer) (*MessageInitiation, error) {
+	var errZeroECDHResult = errors.New("ECDH returned all zeros")
 
 	device.staticIdentity.RLock()
 	defer device.staticIdentity.RUnlock()
@@ -162,12 +163,7 @@ func (device *Device) CreateMessageInitiation(peer *Peer) (*MessageInitiation, e
 	handshake.mutex.Lock()
 	defer handshake.mutex.Unlock()
 
-	if isZero(handshake.precomputedStaticStatic[:]) {
-		return nil, errors.New("static shared secret is zero")
-	}
-
 	// create ephemeral key
-
 	var err error
 	handshake.hash = InitialHash
 	handshake.chainKey = InitialChainKey
@@ -176,56 +172,53 @@ func (device *Device) CreateMessageInitiation(peer *Peer) (*MessageInitiation, e
 		return nil, err
 	}
 
-	// assign index
-
-	device.indexTable.Delete(handshake.localIndex)
-	handshake.localIndex, err = device.indexTable.NewIndexForHandshake(peer, handshake)
-
-	if err != nil {
-		return nil, err
-	}
-
 	handshake.mixHash(handshake.remoteStatic[:])
 
 	msg := MessageInitiation{
 		Type:      MessageInitiationType,
 		Ephemeral: handshake.localEphemeral.publicKey(),
-		Sender:    handshake.localIndex,
 	}
 
 	handshake.mixKey(msg.Ephemeral[:])
 	handshake.mixHash(msg.Ephemeral[:])
 
 	// encrypt static key
-
+	ss := handshake.localEphemeral.sharedSecret(handshake.remoteStatic)
-	func() {
+	if isZero(ss[:]) {
-		var key [chacha20poly1305.KeySize]byte
+		return nil, errZeroECDHResult
-		ss := handshake.localEphemeral.sharedSecret(handshake.remoteStatic)
+	}
-		KDF2(
+	var key [chacha20poly1305.KeySize]byte
-			&handshake.chainKey,
+	KDF2(
-			&key,
+		&handshake.chainKey,
-			handshake.chainKey[:],
+		&key,
-			ss[:],
+		handshake.chainKey[:],
-		)
+		ss[:],
-		aead, _ := chacha20poly1305.New(key[:])
+	)
-		aead.Seal(msg.Static[:0], ZeroNonce[:], device.staticIdentity.publicKey[:], handshake.hash[:])
+	aead, _ := chacha20poly1305.New(key[:])
-	}()
+	aead.Seal(msg.Static[:0], ZeroNonce[:], device.staticIdentity.publicKey[:], handshake.hash[:])
 	handshake.mixHash(msg.Static[:])
 
 	// encrypt timestamp
-
+	if isZero(handshake.precomputedStaticStatic[:]) {
+		return nil, errZeroECDHResult
+	}
+	KDF2(
+		&handshake.chainKey,
+		&key,
+		handshake.chainKey[:],
+		handshake.precomputedStaticStatic[:],
+	)
 	timestamp := tai64n.Now()
-	func() {
+	aead, _ = chacha20poly1305.New(key[:])
-		var key [chacha20poly1305.KeySize]byte
+	aead.Seal(msg.Timestamp[:0], ZeroNonce[:], timestamp[:], handshake.hash[:])
-		KDF2(
+
-			&handshake.chainKey,
+	// assign index
-			&key,
+	device.indexTable.Delete(handshake.localIndex)
-			handshake.chainKey[:],
+	msg.Sender, err = device.indexTable.NewIndexForHandshake(peer, handshake)
-			handshake.precomputedStaticStatic[:],
+	if err != nil {
-		)
+		return nil, err
-		aead, _ := chacha20poly1305.New(key[:])
+	}
-		aead.Seal(msg.Timestamp[:0], ZeroNonce[:], timestamp[:], handshake.hash[:])
+	handshake.localIndex = msg.Sender
-	}()
 
 	handshake.mixHash(msg.Timestamp[:])
 	handshake.state = HandshakeInitiationCreated
@@ -250,16 +243,16 @@ func (device *Device) ConsumeMessageInitiation(msg *MessageInitiation) *Peer {
 	mixKey(&chainKey, &InitialChainKey, msg.Ephemeral[:])
 
 	// decrypt static key
-
 	var err error
 	var peerPK NoisePublicKey
-	func() {
+	var key [chacha20poly1305.KeySize]byte
-		var key [chacha20poly1305.KeySize]byte
+	ss := device.staticIdentity.privateKey.sharedSecret(msg.Ephemeral)
-		ss := device.staticIdentity.privateKey.sharedSecret(msg.Ephemeral)
+	if isZero(ss[:]) {
-		KDF2(&chainKey, &key, chainKey[:], ss[:])
+		return nil
-		aead, _ := chacha20poly1305.New(key[:])
+	}
-		_, err = aead.Open(peerPK[:0], ZeroNonce[:], msg.Static[:], hash[:])
+	KDF2(&chainKey, &key, chainKey[:], ss[:])
-	}()
+	aead, _ := chacha20poly1305.New(key[:])
+	_, err = aead.Open(peerPK[:0], ZeroNonce[:], msg.Static[:], hash[:])
 	if err != nil {
 		return nil
 	}
@@ -273,23 +266,24 @@ func (device *Device) ConsumeMessageInitiation(msg *MessageInitiation) *Peer {
 	}
 
 	handshake := &peer.handshake
-	if isZero(handshake.precomputedStaticStatic[:]) {
-		return nil
-	}
 
 	// verify identity
 
 	var timestamp tai64n.Timestamp
-	var key [chacha20poly1305.KeySize]byte
 
 	handshake.mutex.RLock()
+
+	if isZero(handshake.precomputedStaticStatic[:]) {
+		handshake.mutex.RUnlock()
+		return nil
+	}
 	KDF2(
 		&chainKey,
 		&key,
 		chainKey[:],
 		handshake.precomputedStaticStatic[:],
 	)
-	aead, _ := chacha20poly1305.New(key[:])
+	aead, _ = chacha20poly1305.New(key[:])
 	_, err = aead.Open(timestamp[:0], ZeroNonce[:], msg.Timestamp[:], hash[:])
 	if err != nil {
 		handshake.mutex.RUnlock()
@@ -315,8 +309,13 @@ func (device *Device) ConsumeMessageInitiation(msg *MessageInitiation) *Peer {
 	handshake.chainKey = chainKey
 	handshake.remoteIndex = msg.Sender
 	handshake.remoteEphemeral = msg.Ephemeral
-	handshake.lastTimestamp = timestamp
+	if timestamp.After(handshake.lastTimestamp) {
-	handshake.lastInitiationConsumption = time.Now()
+		handshake.lastTimestamp = timestamp
+	}
+	now := time.Now()
+	if now.After(handshake.lastInitiationConsumption) {
+		handshake.lastInitiationConsumption = now
+	}
 	handshake.state = HandshakeInitiationConsumed
 
 	handshake.mutex.Unlock()

device/noise-types.go

@@ -52,6 +52,15 @@ func (key *NoisePrivateKey) FromHex(src string) (err error) {
 	return
 }
 
+func (key *NoisePrivateKey) FromMaybeZeroHex(src string) (err error) {
+	err = loadExactHex(key[:], src)
+	if key.IsZero() {
+		return
+	}
+	key.clamp()
+	return
+}
+
 func (key NoisePrivateKey) ToHex() string {
 	return hex.EncodeToString(key[:])
 }

device/peer.go

@@ -108,7 +108,6 @@ func (device *Device) NewPeer(pk NoisePublicKey) (*Peer, error) {
 	handshake := &peer.handshake
 	handshake.mutex.Lock()
 	handshake.precomputedStaticStatic = device.staticIdentity.privateKey.sharedSecret(pk)
-	ssIsZero := isZero(handshake.precomputedStaticStatic[:])
 	handshake.remoteStatic = pk
 	handshake.mutex.Unlock()
 
@@ -116,13 +115,9 @@ func (device *Device) NewPeer(pk NoisePublicKey) (*Peer, error) {
 
 	peer.endpoint = nil
 
-	// conditionally add
+	// add
 
-	if !ssIsZero {
+	device.peers.keyMap[pk] = peer
-		device.peers.keyMap[pk] = peer
-	} else {
-		return nil, nil
-	}
 
 	// start peer
 

device/send.go

@@ -220,10 +220,7 @@ func (device *Device) SendHandshakeCookie(initiatingElem *QueueHandshakeElement)
 	writer := bytes.NewBuffer(buff[:0])
 	binary.Write(writer, binary.LittleEndian, reply)
 	device.net.bind.Send(writer.Bytes(), initiatingElem.endpoint)
-	if err != nil {
+	return nil
-		device.log.Error.Println("Failed to send cookie reply:", err)
-	}
-	return err
 }
 
 func (peer *Peer) keepKeyFreshSending() {
@@ -518,10 +515,18 @@ func (device *Device) RoutineEncryption() {
 			// pad content to multiple of 16
 
 			mtu := int(atomic.LoadInt32(&device.tun.mtu))
-			lastUnit := len(elem.packet) % mtu
+			var paddedSize int
-			paddedSize := (lastUnit + PaddingMultiple - 1) & ^(PaddingMultiple - 1)
+			if mtu == 0 {
-			if paddedSize > mtu {
+				paddedSize = (len(elem.packet) + PaddingMultiple - 1) & ^(PaddingMultiple - 1)
-				paddedSize = mtu
+			} else {
+				lastUnit := len(elem.packet)
+				if lastUnit > mtu {
+					lastUnit %= mtu
+				}
+				paddedSize := (lastUnit + PaddingMultiple - 1) & ^(PaddingMultiple - 1)
+				if paddedSize > mtu {
+					paddedSize = mtu
+				}
 			}
 			for i := len(elem.packet); i < paddedSize; i++ {
 				elem.packet = append(elem.packet, 0)

device/uapi.go

@@ -113,6 +113,7 @@ func (device *Device) IpcSetOperation(socket *bufio.Reader) *IPCError {
 	var peer *Peer
 
 	dummy := false
+	createdNewPeer := false
 	deviceConfig := true
 
 	for scanner.Scan() {
@@ -137,7 +138,7 @@ func (device *Device) IpcSetOperation(socket *bufio.Reader) *IPCError {
 			switch key {
 			case "private_key":
 				var sk NoisePrivateKey
-				err := sk.FromHex(value)
+				err := sk.FromMaybeZeroHex(value)
 				if err != nil {
 					logError.Println("Failed to set private_key:", err)
 					return &IPCError{ipc.IpcErrorInvalid}
@@ -237,7 +238,8 @@ func (device *Device) IpcSetOperation(socket *bufio.Reader) *IPCError {
 					peer = device.LookupPeer(publicKey)
 				}
 
-				if peer == nil {
+				createdNewPeer = peer == nil
+				if createdNewPeer {
 					peer, err = device.NewPeer(publicKey)
 					if err != nil {
 						logError.Println("Failed to create new peer:", err)
@@ -251,6 +253,20 @@ func (device *Device) IpcSetOperation(socket *bufio.Reader) *IPCError {
 					}
 				}
 
+			case "update_only":
+
+				// allow disabling of creation
+
+				if value != "true" {
+					logError.Println("Failed to set update only, invalid value:", value)
+					return &IPCError{ipc.IpcErrorInvalid}
+				}
+				if createdNewPeer && !dummy {
+					device.RemovePeer(peer.handshake.remoteStatic)
+					peer = &Peer{}
+					dummy = true
+				}
+
 			case "remove":
 
 				// remove currently selected peer from device

device/version.go

@@ -1,3 +1,3 @@
 package device
 
-const WireGuardGoVersion = "0.0.20190908"
+const WireGuardGoVersion = "0.0.20200320"

go.mod

@@ -3,8 +3,8 @@ module golang.zx2c4.com/wireguard
 go 1.12
 
 require (
-	golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472
+	golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc
-	golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297
+	golang.org/x/net v0.0.0-20191003171128-d98b1b443823
-	golang.org/x/sys v0.0.0-20190830023255-19e00faab6ad
+	golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527
 	golang.org/x/text v0.3.2
 )

go.sum

@@ -1,13 +1,13 @@
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472 h1:Gv7RPwsi3eZ2Fgewe3CBsuOebPwO27PoXzRpJPsvSSM=
+golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc h1:c0o/qxkaO2LF5t6fQrT4b5hzyggAkLLlCUjqfRxd8Q4=
-golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20191002192127-34f69633bfdc/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297 h1:k7pJ2yAPLPgbskkFdhRCsA77k2fySZ1zf2zCjvQCiIM=
+golang.org/x/net v0.0.0-20191003171128-d98b1b443823 h1:Ypyv6BNJh07T1pUSrehkLemqPKXhus2MkfktJ91kRh4=
-golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20191003171128-d98b1b443823/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190830023255-19e00faab6ad h1:cCejgArrk10gX6kFqjWeLwXD7aVMqWoRpyUCaaJSggc=
+golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527 h1:uYVVQ9WP/Ds2ROhcaGPeIdVq0RIXVLwsHlnvJ+cT1So=
-golang.org/x/sys v0.0.0-20190830023255-19e00faab6ad/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=

ipc/uapi_windows.go

@@ -8,6 +8,8 @@ package ipc
 import (
 	"net"
 
+	"golang.org/x/sys/windows"
+
 	"golang.zx2c4.com/wireguard/ipc/winpipe"
 )
 
@@ -47,8 +49,16 @@ func (l *UAPIListener) Addr() net.Addr {
 	return l.listener.Addr()
 }
 
-/* SDDL_DEVOBJ_SYS_ALL from the WDK */
+var UAPISecurityDescriptor *windows.SECURITY_DESCRIPTOR
-var UAPISecurityDescriptor = "O:SYD:P(A;;GA;;;SY)"
+
+func init() {
+	var err error
+	/* SDDL_DEVOBJ_SYS_ALL from the WDK */
+	UAPISecurityDescriptor, err = windows.SecurityDescriptorFromString("O:SYD:P(A;;GA;;;SY)")
+	if err != nil {
+		panic(err)
+	}
+}
 
 func UAPIListen(name string) (net.Listener, error) {
 	config := winpipe.PipeConfig{

ipc/winpipe/file.go

@@ -13,15 +13,16 @@ import (
 	"runtime"
 	"sync"
 	"sync/atomic"
-	"syscall"
 	"time"
+
+	"golang.org/x/sys/windows"
 )
 
-//sys cancelIoEx(file syscall.Handle, o *syscall.Overlapped) (err error) = CancelIoEx
+//sys cancelIoEx(file windows.Handle, o *windows.Overlapped) (err error) = CancelIoEx
-//sys createIoCompletionPort(file syscall.Handle, port syscall.Handle, key uintptr, threadCount uint32) (newport syscall.Handle, err error) = CreateIoCompletionPort
+//sys createIoCompletionPort(file windows.Handle, port windows.Handle, key uintptr, threadCount uint32) (newport windows.Handle, err error) = CreateIoCompletionPort
-//sys getQueuedCompletionStatus(port syscall.Handle, bytes *uint32, key *uintptr, o **ioOperation, timeout uint32) (err error) = GetQueuedCompletionStatus
+//sys getQueuedCompletionStatus(port windows.Handle, bytes *uint32, key *uintptr, o **ioOperation, timeout uint32) (err error) = GetQueuedCompletionStatus
-//sys setFileCompletionNotificationModes(h syscall.Handle, flags uint8) (err error) = SetFileCompletionNotificationModes
+//sys setFileCompletionNotificationModes(h windows.Handle, flags uint8) (err error) = SetFileCompletionNotificationModes
-//sys wsaGetOverlappedResult(h syscall.Handle, o *syscall.Overlapped, bytes *uint32, wait bool, flags *uint32) (err error) = ws2_32.WSAGetOverlappedResult
+//sys wsaGetOverlappedResult(h windows.Handle, o *windows.Overlapped, bytes *uint32, wait bool, flags *uint32) (err error) = ws2_32.WSAGetOverlappedResult
 
 type atomicBool int32
 
@@ -55,7 +56,7 @@ func (e *timeoutError) Temporary() bool { return true }
 type timeoutChan chan struct{}
 
 var ioInitOnce sync.Once
-var ioCompletionPort syscall.Handle
+var ioCompletionPort windows.Handle
 
 // ioResult contains the result of an asynchronous IO operation
 type ioResult struct {
@@ -65,12 +66,12 @@ type ioResult struct {
 
 // ioOperation represents an outstanding asynchronous Win32 IO
 type ioOperation struct {
-	o  syscall.Overlapped
+	o  windows.Overlapped
 	ch chan ioResult
 }
 
 func initIo() {
-	h, err := createIoCompletionPort(syscall.InvalidHandle, 0, 0, 0xffffffff)
+	h, err := createIoCompletionPort(windows.InvalidHandle, 0, 0, 0xffffffff)
 	if err != nil {
 		panic(err)
 	}
@@ -81,7 +82,7 @@ func initIo() {
 // win32File implements Reader, Writer, and Closer on a Win32 handle without blocking in a syscall.
 // It takes ownership of this handle and will close it if it is garbage collected.
 type win32File struct {
-	handle        syscall.Handle
+	handle        windows.Handle
 	wg            sync.WaitGroup
 	wgLock        sync.RWMutex
 	closing       atomicBool
@@ -99,7 +100,7 @@ type deadlineHandler struct {
 }
 
 // makeWin32File makes a new win32File from an existing file handle
-func makeWin32File(h syscall.Handle) (*win32File, error) {
+func makeWin32File(h windows.Handle) (*win32File, error) {
 	f := &win32File{handle: h}
 	ioInitOnce.Do(initIo)
 	_, err := createIoCompletionPort(h, ioCompletionPort, 0, 0xffffffff)
@@ -115,7 +116,7 @@ func makeWin32File(h syscall.Handle) (*win32File, error) {
 	return f, nil
 }
 
-func MakeOpenFile(h syscall.Handle) (io.ReadWriteCloser, error) {
+func MakeOpenFile(h windows.Handle) (io.ReadWriteCloser, error) {
 	return makeWin32File(h)
 }
 
@@ -129,7 +130,7 @@ func (f *win32File) closeHandle() {
 		cancelIoEx(f.handle, nil)
 		f.wg.Wait()
 		// at this point, no new IO can start
-		syscall.Close(f.handle)
+		windows.Close(f.handle)
 		f.handle = 0
 	} else {
 		f.wgLock.Unlock()
@@ -158,12 +159,12 @@ func (f *win32File) prepareIo() (*ioOperation, error) {
 }
 
 // ioCompletionProcessor processes completed async IOs forever
-func ioCompletionProcessor(h syscall.Handle) {
+func ioCompletionProcessor(h windows.Handle) {
 	for {
 		var bytes uint32
 		var key uintptr
 		var op *ioOperation
-		err := getQueuedCompletionStatus(h, &bytes, &key, &op, syscall.INFINITE)
+		err := getQueuedCompletionStatus(h, &bytes, &key, &op, windows.INFINITE)
 		if op == nil {
 			panic(err)
 		}
@@ -174,7 +175,7 @@ func ioCompletionProcessor(h syscall.Handle) {
 // asyncIo processes the return value from ReadFile or WriteFile, blocking until
 // the operation has actually completed.
 func (f *win32File) asyncIo(c *ioOperation, d *deadlineHandler, bytes uint32, err error) (int, error) {
-	if err != syscall.ERROR_IO_PENDING {
+	if err != windows.ERROR_IO_PENDING {
 		return int(bytes), err
 	}
 
@@ -193,7 +194,7 @@ func (f *win32File) asyncIo(c *ioOperation, d *deadlineHandler, bytes uint32, er
 	select {
 	case r = <-c.ch:
 		err = r.err
-		if err == syscall.ERROR_OPERATION_ABORTED {
+		if err == windows.ERROR_OPERATION_ABORTED {
 			if f.closing.isSet() {
 				err = ErrFileClosed
 			}
@@ -206,7 +207,7 @@ func (f *win32File) asyncIo(c *ioOperation, d *deadlineHandler, bytes uint32, er
 		cancelIoEx(f.handle, &c.o)
 		r = <-c.ch
 		err = r.err
-		if err == syscall.ERROR_OPERATION_ABORTED {
+		if err == windows.ERROR_OPERATION_ABORTED {
 			err = ErrTimeout
 		}
 	}
@@ -231,14 +232,14 @@ func (f *win32File) Read(b []byte) (int, error) {
 	}
 
 	var bytes uint32
-	err = syscall.ReadFile(f.handle, b, &bytes, &c.o)
+	err = windows.ReadFile(f.handle, b, &bytes, &c.o)
 	n, err := f.asyncIo(c, &f.readDeadline, bytes, err)
 	runtime.KeepAlive(b)
 
 	// Handle EOF conditions.
 	if err == nil && n == 0 && len(b) != 0 {
 		return 0, io.EOF
-	} else if err == syscall.ERROR_BROKEN_PIPE {
+	} else if err == windows.ERROR_BROKEN_PIPE {
 		return 0, io.EOF
 	} else {
 		return n, err
@@ -258,7 +259,7 @@ func (f *win32File) Write(b []byte) (int, error) {
 	}
 
 	var bytes uint32
-	err = syscall.WriteFile(f.handle, b, &bytes, &c.o)
+	err = windows.WriteFile(f.handle, b, &bytes, &c.o)
 	n, err := f.asyncIo(c, &f.writeDeadline, bytes, err)
 	runtime.KeepAlive(b)
 	return n, err
@@ -273,7 +274,7 @@ func (f *win32File) SetWriteDeadline(deadline time.Time) error {
 }
 
 func (f *win32File) Flush() error {
-	return syscall.FlushFileBuffers(f.handle)
+	return windows.FlushFileBuffers(f.handle)
 }
 
 func (f *win32File) Fd() uintptr {

ipc/winpipe/mksyscall.go

@@ -6,4 +6,4 @@
 
 package winpipe
 
-//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go pipe.go sd.go file.go
+//go:generate go run golang.org/x/sys/windows/mkwinsyscall -output zsyscall_windows.go pipe.go file.go

ipc/winpipe/pipe.go

@@ -16,18 +16,19 @@ import (
 	"net"
 	"os"
 	"runtime"
-	"syscall"
 	"time"
 	"unsafe"
+
+	"golang.org/x/sys/windows"
 )
 
-//sys connectNamedPipe(pipe syscall.Handle, o *syscall.Overlapped) (err error) = ConnectNamedPipe
+//sys connectNamedPipe(pipe windows.Handle, o *windows.Overlapped) (err error) = ConnectNamedPipe
-//sys createNamedPipe(name string, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *syscall.SecurityAttributes) (handle syscall.Handle, err error)  [failretval==syscall.InvalidHandle] = CreateNamedPipeW
+//sys createNamedPipe(name string, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *windows.SecurityAttributes) (handle windows.Handle, err error)  [failretval==windows.InvalidHandle] = CreateNamedPipeW
-//sys createFile(name string, access uint32, mode uint32, sa *syscall.SecurityAttributes, createmode uint32, attrs uint32, templatefile syscall.Handle) (handle syscall.Handle, err error) [failretval==syscall.InvalidHandle] = CreateFileW
+//sys createFile(name string, access uint32, mode uint32, sa *windows.SecurityAttributes, createmode uint32, attrs uint32, templatefile windows.Handle) (handle windows.Handle, err error) [failretval==windows.InvalidHandle] = CreateFileW
-//sys getNamedPipeInfo(pipe syscall.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) = GetNamedPipeInfo
+//sys getNamedPipeInfo(pipe windows.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) = GetNamedPipeInfo
-//sys getNamedPipeHandleState(pipe syscall.Handle, state *uint32, curInstances *uint32, maxCollectionCount *uint32, collectDataTimeout *uint32, userName *uint16, maxUserNameSize uint32) (err error) = GetNamedPipeHandleStateW
+//sys getNamedPipeHandleState(pipe windows.Handle, state *uint32, curInstances *uint32, maxCollectionCount *uint32, collectDataTimeout *uint32, userName *uint16, maxUserNameSize uint32) (err error) = GetNamedPipeHandleStateW
 //sys localAlloc(uFlags uint32, length uint32) (ptr uintptr) = LocalAlloc
-//sys ntCreateNamedPipeFile(pipe *syscall.Handle, access uint32, oa *objectAttributes, iosb *ioStatusBlock, share uint32, disposition uint32, options uint32, typ uint32, readMode uint32, completionMode uint32, maxInstances uint32, inboundQuota uint32, outputQuota uint32, timeout *int64) (status ntstatus) = ntdll.NtCreateNamedPipeFile
+//sys ntCreateNamedPipeFile(pipe *windows.Handle, access uint32, oa *objectAttributes, iosb *ioStatusBlock, share uint32, disposition uint32, options uint32, typ uint32, readMode uint32, completionMode uint32, maxInstances uint32, inboundQuota uint32, outputQuota uint32, timeout *int64) (status ntstatus) = ntdll.NtCreateNamedPipeFile
 //sys rtlNtStatusToDosError(status ntstatus) (winerr error) = ntdll.RtlNtStatusToDosErrorNoTeb
 //sys rtlDosPathNameToNtPathName(name *uint16, ntName *unicodeString, filePart uintptr, reserved uintptr) (status ntstatus) = ntdll.RtlDosPathNameToNtPathName_U
 //sys rtlDefaultNpAcl(dacl *uintptr) (status ntstatus) = ntdll.RtlDefaultNpAcl
@@ -41,7 +42,7 @@ type objectAttributes struct {
 	RootDirectory      uintptr
 	ObjectName         *unicodeString
 	Attributes         uintptr
-	SecurityDescriptor *securityDescriptor
+	SecurityDescriptor *windows.SECURITY_DESCRIPTOR
 	SecurityQoS        uintptr
 }
 
@@ -51,16 +52,6 @@ type unicodeString struct {
 	Buffer        uintptr
 }
 
-type securityDescriptor struct {
-	Revision byte
-	Sbz1     byte
-	Control  uint16
-	Owner    uintptr
-	Group    uintptr
-	Sacl     uintptr
-	Dacl     uintptr
-}
-
 type ntstatus int32
 
 func (status ntstatus) Err() error {
@@ -71,11 +62,6 @@ func (status ntstatus) Err() error {
 }
 
 const (
-	cERROR_PIPE_BUSY      = syscall.Errno(231)
-	cERROR_NO_DATA        = syscall.Errno(232)
-	cERROR_PIPE_CONNECTED = syscall.Errno(535)
-	cERROR_SEM_TIMEOUT    = syscall.Errno(121)
-
 	cSECURITY_SQOS_PRESENT = 0x100000
 	cSECURITY_ANONYMOUS    = 0
 
@@ -88,8 +74,6 @@ const (
 
 	cFILE_PIPE_MESSAGE_TYPE          = 1
 	cFILE_PIPE_REJECT_REMOTE_CLIENTS = 2
-
-	cSE_DACL_PRESENT = 4
 )
 
 var (
@@ -170,7 +154,7 @@ func (f *win32MessageBytePipe) Read(b []byte) (int, error) {
 		// zero-byte message, ensure that all future Read() calls
 		// also return EOF.
 		f.readEOF = true
-	} else if err == syscall.ERROR_MORE_DATA {
+	} else if err == windows.ERROR_MORE_DATA {
 		// ERROR_MORE_DATA indicates that the pipe's read mode is message mode
 		// and the message still has more bytes. Treat this as a success, since
 		// this package presents all named pipes as byte streams.
@@ -188,17 +172,17 @@ func (s pipeAddress) String() string {
 }
 
 // tryDialPipe attempts to dial the pipe at `path` until `ctx` cancellation or timeout.
-func tryDialPipe(ctx context.Context, path *string) (syscall.Handle, error) {
+func tryDialPipe(ctx context.Context, path *string) (windows.Handle, error) {
 	for {
 		select {
 		case <-ctx.Done():
-			return syscall.Handle(0), ctx.Err()
+			return windows.Handle(0), ctx.Err()
 		default:
-			h, err := createFile(*path, syscall.GENERIC_READ|syscall.GENERIC_WRITE, 0, nil, syscall.OPEN_EXISTING, syscall.FILE_FLAG_OVERLAPPED|cSECURITY_SQOS_PRESENT|cSECURITY_ANONYMOUS, 0)
+			h, err := createFile(*path, windows.GENERIC_READ|windows.GENERIC_WRITE, 0, nil, windows.OPEN_EXISTING, windows.FILE_FLAG_OVERLAPPED|cSECURITY_SQOS_PRESENT|cSECURITY_ANONYMOUS, 0)
 			if err == nil {
 				return h, nil
 			}
-			if err != cERROR_PIPE_BUSY {
+			if err != windows.ERROR_PIPE_BUSY {
 				return h, &os.PathError{Err: err, Op: "open", Path: *path}
 			}
 			// Wait 10 msec and try again. This is a rather simplistic
@@ -211,7 +195,7 @@ func tryDialPipe(ctx context.Context, path *string) (syscall.Handle, error) {
 // DialPipe connects to a named pipe by path, timing out if the connection
 // takes longer than the specified duration. If timeout is nil, then we use
 // a default timeout of 2 seconds.  (We do not use WaitNamedPipe.)
-func DialPipe(path string, timeout *time.Duration, expectedOwner *syscall.SID) (net.Conn, error) {
+func DialPipe(path string, timeout *time.Duration, expectedOwner *windows.SID) (net.Conn, error) {
 	var absTimeout time.Time
 	if timeout != nil {
 		absTimeout = time.Now().Add(*timeout)
@@ -228,39 +212,41 @@ func DialPipe(path string, timeout *time.Duration, expectedOwner *syscall.SID) (
 
 // DialPipeContext attempts to connect to a named pipe by `path` until `ctx`
 // cancellation or timeout.
-func DialPipeContext(ctx context.Context, path string, expectedOwner *syscall.SID) (net.Conn, error) {
+func DialPipeContext(ctx context.Context, path string, expectedOwner *windows.SID) (net.Conn, error) {
 	var err error
-	var h syscall.Handle
+	var h windows.Handle
 	h, err = tryDialPipe(ctx, &path)
 	if err != nil {
 		return nil, err
 	}
 
 	if expectedOwner != nil {
-		var realOwner *syscall.SID
+		sd, err := windows.GetSecurityInfo(h, windows.SE_FILE_OBJECT, windows.OWNER_SECURITY_INFORMATION)
-		var realSd uintptr
-		err = getSecurityInfo(h, SE_FILE_OBJECT, OWNER_SECURITY_INFORMATION, &realOwner, nil, nil, nil, &realSd)
 		if err != nil {
-			syscall.Close(h)
+			windows.Close(h)
 			return nil, err
 		}
-		defer localFree(realSd)
+		realOwner, _, err := sd.Owner()
-		if !equalSid(realOwner, expectedOwner) {
+		if err != nil {
-			syscall.Close(h)
+			windows.Close(h)
-			return nil, syscall.ERROR_ACCESS_DENIED
+			return nil, err
+		}
+		if !realOwner.Equals(expectedOwner) {
+			windows.Close(h)
+			return nil, windows.ERROR_ACCESS_DENIED
 		}
 	}
 
 	var flags uint32
 	err = getNamedPipeInfo(h, &flags, nil, nil, nil)
 	if err != nil {
-		syscall.Close(h)
+		windows.Close(h)
 		return nil, err
 	}
 
 	f, err := makeWin32File(h)
 	if err != nil {
-		syscall.Close(h)
+		windows.Close(h)
 		return nil, err
 	}
 
@@ -280,7 +266,7 @@ type acceptResponse struct {
 }
 
 type win32PipeListener struct {
-	firstHandle syscall.Handle
+	firstHandle windows.Handle
 	path        string
 	config      PipeConfig
 	acceptCh    chan (chan acceptResponse)
@@ -288,8 +274,8 @@ type win32PipeListener struct {
 	doneCh      chan int
 }
 
-func makeServerPipeHandle(path string, sd []byte, c *PipeConfig, first bool) (syscall.Handle, error) {
+func makeServerPipeHandle(path string, sd *windows.SECURITY_DESCRIPTOR, c *PipeConfig, first bool) (windows.Handle, error) {
-	path16, err := syscall.UTF16FromString(path)
+	path16, err := windows.UTF16FromString(path)
 	if err != nil {
 		return 0, &os.PathError{Op: "open", Path: path, Err: err}
 	}
@@ -301,31 +287,32 @@ func makeServerPipeHandle(path string, sd []byte, c *PipeConfig, first bool) (sy
 	if err := rtlDosPathNameToNtPathName(&path16[0], &ntPath, 0, 0).Err(); err != nil {
 		return 0, &os.PathError{Op: "open", Path: path, Err: err}
 	}
-	defer localFree(ntPath.Buffer)
+	defer windows.LocalFree(windows.Handle(ntPath.Buffer))
 	oa.ObjectName = &ntPath
 
 	// The security descriptor is only needed for the first pipe.
 	if first {
 		if sd != nil {
-			len := uint32(len(sd))
+			oa.SecurityDescriptor = sd
-			sdb := localAlloc(0, len)
-			defer localFree(sdb)
-			copy((*[0xffff]byte)(unsafe.Pointer(sdb))[:], sd)
-			oa.SecurityDescriptor = (*securityDescriptor)(unsafe.Pointer(sdb))
 		} else {
 			// Construct the default named pipe security descriptor.
 			var dacl uintptr
 			if err := rtlDefaultNpAcl(&dacl).Err(); err != nil {
 				return 0, fmt.Errorf("getting default named pipe ACL: %s", err)
 			}
-			defer localFree(dacl)
+			defer windows.LocalFree(windows.Handle(dacl))
-
+			sd, err := windows.NewSecurityDescriptor()
-			sdb := &securityDescriptor{
+			if err != nil {
-				Revision: 1,
+				return 0, fmt.Errorf("creating new security descriptor: %s", err)
-				Control:  cSE_DACL_PRESENT,
-				Dacl:     dacl,
 			}
-			oa.SecurityDescriptor = sdb
+			if err = sd.SetDACL((*windows.ACL)(unsafe.Pointer(dacl)), true, false); err != nil {
+				return 0, fmt.Errorf("assigning dacl: %s", err)
+			}
+			sd, err = sd.ToSelfRelative()
+			if err != nil {
+				return 0, fmt.Errorf("converting to self-relative: %s", err)
+			}
+			oa.SecurityDescriptor = sd
 		}
 	}
 
@@ -335,22 +322,22 @@ func makeServerPipeHandle(path string, sd []byte, c *PipeConfig, first bool) (sy
 	}
 
 	disposition := uint32(cFILE_OPEN)
-	access := uint32(syscall.GENERIC_READ | syscall.GENERIC_WRITE | syscall.SYNCHRONIZE)
+	access := uint32(windows.GENERIC_READ | windows.GENERIC_WRITE | windows.SYNCHRONIZE)
 	if first {
 		disposition = cFILE_CREATE
 		// By not asking for read or write access, the named pipe file system
 		// will put this pipe into an initially disconnected state, blocking
 		// client connections until the next call with first == false.
-		access = syscall.SYNCHRONIZE
+		access = windows.SYNCHRONIZE
 	}
 
 	timeout := int64(-50 * 10000) // 50ms
 
 	var (
-		h    syscall.Handle
+		h    windows.Handle
 		iosb ioStatusBlock
 	)
-	err = ntCreateNamedPipeFile(&h, access, &oa, &iosb, syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE, disposition, 0, typ, 0, 0, 0xffffffff, uint32(c.InputBufferSize), uint32(c.OutputBufferSize), &timeout).Err()
+	err = ntCreateNamedPipeFile(&h, access, &oa, &iosb, windows.FILE_SHARE_READ|windows.FILE_SHARE_WRITE, disposition, 0, typ, 0, 0, 0xffffffff, uint32(c.InputBufferSize), uint32(c.OutputBufferSize), &timeout).Err()
 	if err != nil {
 		return 0, &os.PathError{Op: "open", Path: path, Err: err}
 	}
@@ -366,7 +353,7 @@ func (l *win32PipeListener) makeServerPipe() (*win32File, error) {
 	}
 	f, err := makeWin32File(h)
 	if err != nil {
-		syscall.Close(h)
+		windows.Close(h)
 		return nil, err
 	}
 	return f, nil
@@ -417,7 +404,7 @@ func (l *win32PipeListener) listenerRoutine() {
 				p, err = l.makeConnectedServerPipe()
 				// If the connection was immediately closed by the client, try
 				// again.
-				if err != cERROR_NO_DATA {
+				if err != windows.ERROR_NO_DATA {
 					break
 				}
 			}
@@ -425,7 +412,7 @@ func (l *win32PipeListener) listenerRoutine() {
 			closed = err == ErrPipeListenerClosed
 		}
 	}
-	syscall.Close(l.firstHandle)
+	windows.Close(l.firstHandle)
 	l.firstHandle = 0
 	// Notify Close() and Accept() callers that the handle has been closed.
 	close(l.doneCh)
@@ -433,8 +420,8 @@ func (l *win32PipeListener) listenerRoutine() {
 
 // PipeConfig contain configuration for the pipe listener.
 type PipeConfig struct {
-	// SecurityDescriptor contains a Windows security descriptor in SDDL format.
+	// SecurityDescriptor contains a Windows security descriptor.
-	SecurityDescriptor string
+	SecurityDescriptor *windows.SECURITY_DESCRIPTOR
 
 	// MessageMode determines whether the pipe is in byte or message mode. In either
 	// case the pipe is read in byte mode by default. The only practical difference in
@@ -454,20 +441,10 @@ type PipeConfig struct {
 // ListenPipe creates a listener on a Windows named pipe path, e.g. \\.\pipe\mypipe.
 // The pipe must not already exist.
 func ListenPipe(path string, c *PipeConfig) (net.Listener, error) {
-	var (
-		sd  []byte
-		err error
-	)
 	if c == nil {
 		c = &PipeConfig{}
 	}
-	if c.SecurityDescriptor != "" {
+	h, err := makeServerPipeHandle(path, c.SecurityDescriptor, c, true)
-		sd, err = SddlToSecurityDescriptor(c.SecurityDescriptor)
-		if err != nil {
-			return nil, err
-		}
-	}
-	h, err := makeServerPipeHandle(path, sd, c, true)
 	if err != nil {
 		return nil, err
 	}
@@ -492,7 +469,7 @@ func connectPipe(p *win32File) error {
 
 	err = connectNamedPipe(p.handle, &c.o)
 	_, err = p.asyncIo(c, nil, 0, err)
-	if err != nil && err != cERROR_PIPE_CONNECTED {
+	if err != nil && err != windows.ERROR_PIPE_CONNECTED {
 		return err
 	}
 	return nil

ipc/winpipe/sd.go

@@ -1,36 +0,0 @@
-// +build windows
-
-/* SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2005 Microsoft
- * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
- */
-
-package winpipe
-
-import (
-	"unsafe"
-)
-
-//sys	convertStringSecurityDescriptorToSecurityDescriptor(str string, revision uint32, sd *uintptr, size *uint32) (err error) = advapi32.ConvertStringSecurityDescriptorToSecurityDescriptorW
-//sys	localFree(mem uintptr) = LocalFree
-//sys	getSecurityDescriptorLength(sd uintptr) (len uint32) = advapi32.GetSecurityDescriptorLength
-//sys	getSecurityInfo(handle syscall.Handle, objectType uint32, securityInformation uint32, owner **syscall.SID, group **syscall.SID, dacl *uintptr, sacl *uintptr, sd *uintptr) (ret error) = advapi32.GetSecurityInfo
-//sys	equalSid(sid1 *syscall.SID, sid2 *syscall.SID) (isEqual bool) = advapi32.EqualSid
-
-const (
-	SE_FILE_OBJECT             = 1
-	OWNER_SECURITY_INFORMATION = 1
-)
-
-func SddlToSecurityDescriptor(sddl string) ([]byte, error) {
-	var sdBuffer uintptr
-	err := convertStringSecurityDescriptorToSecurityDescriptor(sddl, 1, &sdBuffer, nil)
-	if err != nil {
-		return nil, err
-	}
-	defer localFree(sdBuffer)
-	sd := make([]byte, getSecurityDescriptorLength(sdBuffer))
-	copy(sd, (*[0xffff]byte)(unsafe.Pointer(sdBuffer))[:len(sd)])
-	return sd, nil
-}

ipc/winpipe/zsyscall_windows.go

@@ -39,32 +39,26 @@ func errnoErr(e syscall.Errno) error {
 var (
 	modkernel32 = windows.NewLazySystemDLL("kernel32.dll")
 	modntdll    = windows.NewLazySystemDLL("ntdll.dll")
-	modadvapi32 = windows.NewLazySystemDLL("advapi32.dll")
 	modws2_32   = windows.NewLazySystemDLL("ws2_32.dll")
 
-	procConnectNamedPipe                                     = modkernel32.NewProc("ConnectNamedPipe")
+	procConnectNamedPipe                   = modkernel32.NewProc("ConnectNamedPipe")
-	procCreateNamedPipeW                                     = modkernel32.NewProc("CreateNamedPipeW")
+	procCreateNamedPipeW                   = modkernel32.NewProc("CreateNamedPipeW")
-	procCreateFileW                                          = modkernel32.NewProc("CreateFileW")
+	procCreateFileW                        = modkernel32.NewProc("CreateFileW")
-	procGetNamedPipeInfo                                     = modkernel32.NewProc("GetNamedPipeInfo")
+	procGetNamedPipeInfo                   = modkernel32.NewProc("GetNamedPipeInfo")
-	procGetNamedPipeHandleStateW                             = modkernel32.NewProc("GetNamedPipeHandleStateW")
+	procGetNamedPipeHandleStateW           = modkernel32.NewProc("GetNamedPipeHandleStateW")
-	procLocalAlloc                                           = modkernel32.NewProc("LocalAlloc")
+	procLocalAlloc                         = modkernel32.NewProc("LocalAlloc")
-	procNtCreateNamedPipeFile                                = modntdll.NewProc("NtCreateNamedPipeFile")
+	procNtCreateNamedPipeFile              = modntdll.NewProc("NtCreateNamedPipeFile")
-	procRtlNtStatusToDosErrorNoTeb                           = modntdll.NewProc("RtlNtStatusToDosErrorNoTeb")
+	procRtlNtStatusToDosErrorNoTeb         = modntdll.NewProc("RtlNtStatusToDosErrorNoTeb")
-	procRtlDosPathNameToNtPathName_U                         = modntdll.NewProc("RtlDosPathNameToNtPathName_U")
+	procRtlDosPathNameToNtPathName_U       = modntdll.NewProc("RtlDosPathNameToNtPathName_U")
-	procRtlDefaultNpAcl                                      = modntdll.NewProc("RtlDefaultNpAcl")
+	procRtlDefaultNpAcl                    = modntdll.NewProc("RtlDefaultNpAcl")
-	procConvertStringSecurityDescriptorToSecurityDescriptorW = modadvapi32.NewProc("ConvertStringSecurityDescriptorToSecurityDescriptorW")
+	procCancelIoEx                         = modkernel32.NewProc("CancelIoEx")
-	procLocalFree                                            = modkernel32.NewProc("LocalFree")
+	procCreateIoCompletionPort             = modkernel32.NewProc("CreateIoCompletionPort")
-	procGetSecurityDescriptorLength                          = modadvapi32.NewProc("GetSecurityDescriptorLength")
+	procGetQueuedCompletionStatus          = modkernel32.NewProc("GetQueuedCompletionStatus")
-	procGetSecurityInfo                                      = modadvapi32.NewProc("GetSecurityInfo")
+	procSetFileCompletionNotificationModes = modkernel32.NewProc("SetFileCompletionNotificationModes")
-	procEqualSid                                             = modadvapi32.NewProc("EqualSid")
+	procWSAGetOverlappedResult             = modws2_32.NewProc("WSAGetOverlappedResult")
-	procCancelIoEx                                           = modkernel32.NewProc("CancelIoEx")
-	procCreateIoCompletionPort                               = modkernel32.NewProc("CreateIoCompletionPort")
-	procGetQueuedCompletionStatus                            = modkernel32.NewProc("GetQueuedCompletionStatus")
-	procSetFileCompletionNotificationModes                   = modkernel32.NewProc("SetFileCompletionNotificationModes")
-	procWSAGetOverlappedResult                               = modws2_32.NewProc("WSAGetOverlappedResult")
 )
 
-func connectNamedPipe(pipe syscall.Handle, o *syscall.Overlapped) (err error) {
+func connectNamedPipe(pipe windows.Handle, o *windows.Overlapped) (err error) {
 	r1, _, e1 := syscall.Syscall(procConnectNamedPipe.Addr(), 2, uintptr(pipe), uintptr(unsafe.Pointer(o)), 0)
 	if r1 == 0 {
 		if e1 != 0 {
@@ -76,7 +70,7 @@ func connectNamedPipe(pipe syscall.Handle, o *syscall.Overlapped) (err error) {
 	return
 }
 
-func createNamedPipe(name string, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *syscall.SecurityAttributes) (handle syscall.Handle, err error) {
+func createNamedPipe(name string, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *windows.SecurityAttributes) (handle windows.Handle, err error) {
 	var _p0 *uint16
 	_p0, err = syscall.UTF16PtrFromString(name)
 	if err != nil {
@@ -85,10 +79,10 @@ func createNamedPipe(name string, flags uint32, pipeMode uint32, maxInstances ui
 	return _createNamedPipe(_p0, flags, pipeMode, maxInstances, outSize, inSize, defaultTimeout, sa)
 }
 
-func _createNamedPipe(name *uint16, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *syscall.SecurityAttributes) (handle syscall.Handle, err error) {
+func _createNamedPipe(name *uint16, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *windows.SecurityAttributes) (handle windows.Handle, err error) {
 	r0, _, e1 := syscall.Syscall9(procCreateNamedPipeW.Addr(), 8, uintptr(unsafe.Pointer(name)), uintptr(flags), uintptr(pipeMode), uintptr(maxInstances), uintptr(outSize), uintptr(inSize), uintptr(defaultTimeout), uintptr(unsafe.Pointer(sa)), 0)
-	handle = syscall.Handle(r0)
+	handle = windows.Handle(r0)
-	if handle == syscall.InvalidHandle {
+	if handle == windows.InvalidHandle {
 		if e1 != 0 {
 			err = errnoErr(e1)
 		} else {
@@ -98,7 +92,7 @@ func _createNamedPipe(name *uint16, flags uint32, pipeMode uint32, maxInstances
 	return
 }
 
-func createFile(name string, access uint32, mode uint32, sa *syscall.SecurityAttributes, createmode uint32, attrs uint32, templatefile syscall.Handle) (handle syscall.Handle, err error) {
+func createFile(name string, access uint32, mode uint32, sa *windows.SecurityAttributes, createmode uint32, attrs uint32, templatefile windows.Handle) (handle windows.Handle, err error) {
 	var _p0 *uint16
 	_p0, err = syscall.UTF16PtrFromString(name)
 	if err != nil {
@@ -107,10 +101,10 @@ func createFile(name string, access uint32, mode uint32, sa *syscall.SecurityAtt
 	return _createFile(_p0, access, mode, sa, createmode, attrs, templatefile)
 }
 
-func _createFile(name *uint16, access uint32, mode uint32, sa *syscall.SecurityAttributes, createmode uint32, attrs uint32, templatefile syscall.Handle) (handle syscall.Handle, err error) {
+func _createFile(name *uint16, access uint32, mode uint32, sa *windows.SecurityAttributes, createmode uint32, attrs uint32, templatefile windows.Handle) (handle windows.Handle, err error) {
 	r0, _, e1 := syscall.Syscall9(procCreateFileW.Addr(), 7, uintptr(unsafe.Pointer(name)), uintptr(access), uintptr(mode), uintptr(unsafe.Pointer(sa)), uintptr(createmode), uintptr(attrs), uintptr(templatefile), 0, 0)
-	handle = syscall.Handle(r0)
+	handle = windows.Handle(r0)
-	if handle == syscall.InvalidHandle {
+	if handle == windows.InvalidHandle {
 		if e1 != 0 {
 			err = errnoErr(e1)
 		} else {
@@ -120,7 +114,7 @@ func _createFile(name *uint16, access uint32, mode uint32, sa *syscall.SecurityA
 	return
 }
 
-func getNamedPipeInfo(pipe syscall.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) {
+func getNamedPipeInfo(pipe windows.Handle, flags *uint32, outSize *uint32, inSize *uint32, maxInstances *uint32) (err error) {
 	r1, _, e1 := syscall.Syscall6(procGetNamedPipeInfo.Addr(), 5, uintptr(pipe), uintptr(unsafe.Pointer(flags)), uintptr(unsafe.Pointer(outSize)), uintptr(unsafe.Pointer(inSize)), uintptr(unsafe.Pointer(maxInstances)), 0)
 	if r1 == 0 {
 		if e1 != 0 {
@@ -132,7 +126,7 @@ func getNamedPipeInfo(pipe syscall.Handle, flags *uint32, outSize *uint32, inSiz
 	return
 }
 
-func getNamedPipeHandleState(pipe syscall.Handle, state *uint32, curInstances *uint32, maxCollectionCount *uint32, collectDataTimeout *uint32, userName *uint16, maxUserNameSize uint32) (err error) {
+func getNamedPipeHandleState(pipe windows.Handle, state *uint32, curInstances *uint32, maxCollectionCount *uint32, collectDataTimeout *uint32, userName *uint16, maxUserNameSize uint32) (err error) {
 	r1, _, e1 := syscall.Syscall9(procGetNamedPipeHandleStateW.Addr(), 7, uintptr(pipe), uintptr(unsafe.Pointer(state)), uintptr(unsafe.Pointer(curInstances)), uintptr(unsafe.Pointer(maxCollectionCount)), uintptr(unsafe.Pointer(collectDataTimeout)), uintptr(unsafe.Pointer(userName)), uintptr(maxUserNameSize), 0, 0)
 	if r1 == 0 {
 		if e1 != 0 {
@@ -150,7 +144,7 @@ func localAlloc(uFlags uint32, length uint32) (ptr uintptr) {
 	return
 }
 
-func ntCreateNamedPipeFile(pipe *syscall.Handle, access uint32, oa *objectAttributes, iosb *ioStatusBlock, share uint32, disposition uint32, options uint32, typ uint32, readMode uint32, completionMode uint32, maxInstances uint32, inboundQuota uint32, outputQuota uint32, timeout *int64) (status ntstatus) {
+func ntCreateNamedPipeFile(pipe *windows.Handle, access uint32, oa *objectAttributes, iosb *ioStatusBlock, share uint32, disposition uint32, options uint32, typ uint32, readMode uint32, completionMode uint32, maxInstances uint32, inboundQuota uint32, outputQuota uint32, timeout *int64) (status ntstatus) {
 	r0, _, _ := syscall.Syscall15(procNtCreateNamedPipeFile.Addr(), 14, uintptr(unsafe.Pointer(pipe)), uintptr(access), uintptr(unsafe.Pointer(oa)), uintptr(unsafe.Pointer(iosb)), uintptr(share), uintptr(disposition), uintptr(options), uintptr(typ), uintptr(readMode), uintptr(completionMode), uintptr(maxInstances), uintptr(inboundQuota), uintptr(outputQuota), uintptr(unsafe.Pointer(timeout)), 0)
 	status = ntstatus(r0)
 	return
@@ -176,53 +170,7 @@ func rtlDefaultNpAcl(dacl *uintptr) (status ntstatus) {
 	return
 }
 
-func convertStringSecurityDescriptorToSecurityDescriptor(str string, revision uint32, sd *uintptr, size *uint32) (err error) {
+func cancelIoEx(file windows.Handle, o *windows.Overlapped) (err error) {
-	var _p0 *uint16
-	_p0, err = syscall.UTF16PtrFromString(str)
-	if err != nil {
-		return
-	}
-	return _convertStringSecurityDescriptorToSecurityDescriptor(_p0, revision, sd, size)
-}
-
-func _convertStringSecurityDescriptorToSecurityDescriptor(str *uint16, revision uint32, sd *uintptr, size *uint32) (err error) {
-	r1, _, e1 := syscall.Syscall6(procConvertStringSecurityDescriptorToSecurityDescriptorW.Addr(), 4, uintptr(unsafe.Pointer(str)), uintptr(revision), uintptr(unsafe.Pointer(sd)), uintptr(unsafe.Pointer(size)), 0, 0)
-	if r1 == 0 {
-		if e1 != 0 {
-			err = errnoErr(e1)
-		} else {
-			err = syscall.EINVAL
-		}
-	}
-	return
-}
-
-func localFree(mem uintptr) {
-	syscall.Syscall(procLocalFree.Addr(), 1, uintptr(mem), 0, 0)
-	return
-}
-
-func getSecurityDescriptorLength(sd uintptr) (len uint32) {
-	r0, _, _ := syscall.Syscall(procGetSecurityDescriptorLength.Addr(), 1, uintptr(sd), 0, 0)
-	len = uint32(r0)
-	return
-}
-
-func getSecurityInfo(handle syscall.Handle, objectType uint32, securityInformation uint32, owner **syscall.SID, group **syscall.SID, dacl *uintptr, sacl *uintptr, sd *uintptr) (ret error) {
-	r0, _, _ := syscall.Syscall9(procGetSecurityInfo.Addr(), 8, uintptr(handle), uintptr(objectType), uintptr(securityInformation), uintptr(unsafe.Pointer(owner)), uintptr(unsafe.Pointer(group)), uintptr(unsafe.Pointer(dacl)), uintptr(unsafe.Pointer(sacl)), uintptr(unsafe.Pointer(sd)), 0)
-	if r0 != 0 {
-		ret = syscall.Errno(r0)
-	}
-	return
-}
-
-func equalSid(sid1 *syscall.SID, sid2 *syscall.SID) (isEqual bool) {
-	r0, _, _ := syscall.Syscall(procEqualSid.Addr(), 2, uintptr(unsafe.Pointer(sid1)), uintptr(unsafe.Pointer(sid2)), 0)
-	isEqual = r0 != 0
-	return
-}
-
-func cancelIoEx(file syscall.Handle, o *syscall.Overlapped) (err error) {
 	r1, _, e1 := syscall.Syscall(procCancelIoEx.Addr(), 2, uintptr(file), uintptr(unsafe.Pointer(o)), 0)
 	if r1 == 0 {
 		if e1 != 0 {
@@ -234,9 +182,9 @@ func cancelIoEx(file syscall.Handle, o *syscall.Overlapped) (err error) {
 	return
 }
 
-func createIoCompletionPort(file syscall.Handle, port syscall.Handle, key uintptr, threadCount uint32) (newport syscall.Handle, err error) {
+func createIoCompletionPort(file windows.Handle, port windows.Handle, key uintptr, threadCount uint32) (newport windows.Handle, err error) {
 	r0, _, e1 := syscall.Syscall6(procCreateIoCompletionPort.Addr(), 4, uintptr(file), uintptr(port), uintptr(key), uintptr(threadCount), 0, 0)
-	newport = syscall.Handle(r0)
+	newport = windows.Handle(r0)
 	if newport == 0 {
 		if e1 != 0 {
 			err = errnoErr(e1)
@@ -247,7 +195,7 @@ func createIoCompletionPort(file syscall.Handle, port syscall.Handle, key uintpt
 	return
 }
 
-func getQueuedCompletionStatus(port syscall.Handle, bytes *uint32, key *uintptr, o **ioOperation, timeout uint32) (err error) {
+func getQueuedCompletionStatus(port windows.Handle, bytes *uint32, key *uintptr, o **ioOperation, timeout uint32) (err error) {
 	r1, _, e1 := syscall.Syscall6(procGetQueuedCompletionStatus.Addr(), 5, uintptr(port), uintptr(unsafe.Pointer(bytes)), uintptr(unsafe.Pointer(key)), uintptr(unsafe.Pointer(o)), uintptr(timeout), 0)
 	if r1 == 0 {
 		if e1 != 0 {
@@ -259,7 +207,7 @@ func getQueuedCompletionStatus(port syscall.Handle, bytes *uint32, key *uintptr,
 	return
 }
 
-func setFileCompletionNotificationModes(h syscall.Handle, flags uint8) (err error) {
+func setFileCompletionNotificationModes(h windows.Handle, flags uint8) (err error) {
 	r1, _, e1 := syscall.Syscall(procSetFileCompletionNotificationModes.Addr(), 2, uintptr(h), uintptr(flags), 0)
 	if r1 == 0 {
 		if e1 != 0 {
@@ -271,7 +219,7 @@ func setFileCompletionNotificationModes(h syscall.Handle, flags uint8) (err erro
 	return
 }
 
-func wsaGetOverlappedResult(h syscall.Handle, o *syscall.Overlapped, bytes *uint32, wait bool, flags *uint32) (err error) {
+func wsaGetOverlappedResult(h windows.Handle, o *windows.Overlapped, bytes *uint32, wait bool, flags *uint32) (err error) {
 	var _p0 uint32
 	if wait {
 		_p0 = 1

main_windows.go

@@ -37,7 +37,7 @@ func main() {
 	logger.Info.Println("Starting wireguard-go version", device.WireGuardGoVersion)
 	logger.Debug.Println("Debug log enabled")
 
-	tun, err := tun.CreateTUN(interfaceName)
+	tun, err := tun.CreateTUN(interfaceName, 0)
 	if err == nil {
 		realInterfaceName, err2 := tun.Name()
 		if err2 == nil {

ratelimiter/ratelimiter_test.go

@@ -36,7 +36,7 @@ func TestRatelimiter(t *testing.T) {
 	for i := 0; i < packetsBurstable; i++ {
 		Add(RatelimiterResult{
 			allowed: true,
-			text:    "inital burst",
+			text:    "initial burst",
 		})
 	}
 

rwcancel/rwcancel.go

@@ -60,7 +60,13 @@ func (rw *RWCancel) ReadyRead() bool {
 	fdset := fdSet{}
 	fdset.set(rw.fd)
 	fdset.set(closeFd)
-	err := unixSelect(max(rw.fd, closeFd)+1, &fdset.FdSet, nil, nil, nil)
+	var err error
+	for {
+		err = unixSelect(max(rw.fd, closeFd)+1, &fdset.FdSet, nil, nil, nil)
+		if err == nil || !RetryAfterError(err) {
+			break
+		}
+	}
 	if err != nil {
 		return false
 	}
@@ -75,7 +81,13 @@ func (rw *RWCancel) ReadyWrite() bool {
 	fdset := fdSet{}
 	fdset.set(rw.fd)
 	fdset.set(closeFd)
-	err := unixSelect(max(rw.fd, closeFd)+1, nil, &fdset.FdSet, nil, nil)
+	var err error
+	for {
+		err = unixSelect(max(rw.fd, closeFd)+1, nil, &fdset.FdSet, nil, nil)
+		if err == nil || !RetryAfterError(err) {
+			break
+		}
+	}
 	if err != nil {
 		return false
 	}

tun/tun_darwin.go

@@ -11,6 +11,7 @@ import (
 	"net"
 	"os"
 	"syscall"
+	"time"
 	"unsafe"
 
 	"golang.org/x/net/ipv6"
@@ -42,6 +43,22 @@ type NativeTun struct {
 
 var sockaddrCtlSize uintptr = 32
 
+func retryInterfaceByIndex(index int) (iface *net.Interface, err error) {
+	for i := 0; i < 20; i++ {
+		iface, err = net.InterfaceByIndex(index)
+		if err != nil {
+			if opErr, ok := err.(*net.OpError); ok {
+				if syscallErr, ok := opErr.Err.(*os.SyscallError); ok && syscallErr.Err == syscall.ENOMEM {
+					time.Sleep(time.Duration(i) * time.Second / 3)
+					continue
+				}
+			}
+		}
+		return iface, err
+	}
+	return nil, err
+}
+
 func (tun *NativeTun) routineRouteListener(tunIfindex int) {
 	var (
 		statusUp  bool
@@ -74,7 +91,7 @@ func (tun *NativeTun) routineRouteListener(tunIfindex int) {
 			continue
 		}
 
-		iface, err := net.InterfaceByIndex(ifindex)
+		iface, err := retryInterfaceByIndex(ifindex)
 		if err != nil {
 			tun.errors <- err
 			return

tun/tun_linux.go

@@ -35,7 +35,7 @@ type NativeTun struct {
 	name                    string     // name of interface
 	errors                  chan error // async error handling
 	events                  chan Event // device related events
-	nopi                    bool       // the device was pased IFF_NO_PI
+	nopi                    bool       // the device was passed IFF_NO_PI
 	netlinkSock             int
 	netlinkCancel           *rwcancel.RWCancel
 	hackListenerClosed      sync.Mutex
@@ -85,7 +85,7 @@ func createNetlinkSocket() (int, error) {
 	}
 	saddr := &unix.SockaddrNetlink{
 		Family: unix.AF_NETLINK,
-		Groups: uint32((1 << (unix.RTNLGRP_LINK - 1)) | (1 << (unix.RTNLGRP_IPV4_IFADDR - 1)) | (1 << (unix.RTNLGRP_IPV6_IFADDR - 1))),
+		Groups: unix.RTMGRP_LINK | unix.RTMGRP_IPV4_IFADDR | unix.RTMGRP_IPV6_IFADDR,
 	}
 	err = unix.Bind(sock, saddr)
 	if err != nil {

tun/tun_windows.go

@@ -9,6 +9,7 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"sync"
 	"sync/atomic"
 	"time"
 	"unsafe"
@@ -35,11 +36,12 @@ type NativeTun struct {
 	wt        *wintun.Interface
 	handle    windows.Handle
 	close     bool
-	rings     wintun.RingDescriptor
 	events    chan Event
 	errors    chan error
 	forcedMTU int
 	rate      rateJuggler
+	rings     *wintun.RingDescriptor
+	writeLock sync.Mutex
 }
 
 const WintunPool = wintun.Pool("WireGuard")
@@ -54,15 +56,15 @@ func nanotime() int64
 // CreateTUN creates a Wintun interface with the given name. Should a Wintun
 // interface with the same name exist, it is reused.
 //
-func CreateTUN(ifname string) (Device, error) {
+func CreateTUN(ifname string, mtu int) (Device, error) {
-	return CreateTUNWithRequestedGUID(ifname, nil)
+	return CreateTUNWithRequestedGUID(ifname, nil, mtu)
 }
 
 //
 // CreateTUNWithRequestedGUID creates a Wintun interface with the given name and
 // a requested GUID. Should a Wintun interface with the same name exist, it is reused.
 //
-func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID) (Device, error) {
+func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID, mtu int) (Device, error) {
 	var err error
 	var wt *wintun.Interface
 
@@ -72,12 +74,17 @@ func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID) (Dev
 		// If so, we delete it, in case it has weird residual configuration.
 		_, err = wt.DeleteInterface()
 		if err != nil {
-			return nil, fmt.Errorf("Unable to delete already existing Wintun interface: %v", err)
+			return nil, fmt.Errorf("Error deleting already existing interface: %v", err)
 		}
 	}
 	wt, _, err = WintunPool.CreateInterface(ifname, requestedGUID)
 	if err != nil {
-		return nil, fmt.Errorf("Unable to create Wintun interface: %v", err)
+		return nil, fmt.Errorf("Error creating interface: %v", err)
+	}
+
+	forcedMTU := 1420
+	if mtu > 0 {
+		forcedMTU = mtu
 	}
 
 	tun := &NativeTun{
@@ -85,16 +92,16 @@ func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID) (Dev
 		handle:    windows.InvalidHandle,
 		events:    make(chan Event, 10),
 		errors:    make(chan error, 1),
-		forcedMTU: 1500,
+		forcedMTU: forcedMTU,
 	}
 
-	err = tun.rings.Init()
+	tun.rings, err = wintun.NewRingDescriptor()
 	if err != nil {
 		tun.Close()
 		return nil, fmt.Errorf("Error creating events: %v", err)
 	}
 
-	tun.handle, err = tun.wt.Register(&tun.rings)
+	tun.handle, err = tun.wt.Register(tun.rings)
 	if err != nil {
 		tun.Close()
 		return nil, fmt.Errorf("Error registering rings: %v", err)
@@ -214,6 +221,9 @@ func (tun *NativeTun) Write(buff []byte, offset int) (int, error) {
 	tun.rate.update(uint64(packetSize))
 	alignedPacketSize := wintun.PacketAlign(uint32(unsafe.Sizeof(wintun.PacketHeader{})) + packetSize)
 
+	tun.writeLock.Lock()
+	defer tun.writeLock.Unlock()
+
 	buffHead := atomic.LoadUint32(&tun.rings.Receive.Ring.Head)
 	if buffHead >= wintun.PacketCapacity {
 		return 0, os.ErrClosed
@@ -244,6 +254,11 @@ func (tun *NativeTun) LUID() uint64 {
 	return tun.wt.LUID()
 }
 
+// Version returns the version of the Wintun driver and NDIS system currently loaded.
+func (tun *NativeTun) Version() (driverVersion string, ndisVersion string, err error) {
+	return tun.wt.Version()
+}
+
 func (rate *rateJuggler) update(packetLen uint64) {
 	now := nanotime()
 	total := atomic.AddUint64(&rate.nextByteCount, packetLen)

tun/wintun/iphlpapi/mksyscall.go

@@ -5,4 +5,4 @@
 
 package iphlpapi
 
-//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go conversion_windows.go
+//go:generate go run golang.org/x/sys/windows/mkwinsyscall -output zsyscall_windows.go conversion_windows.go

tun/wintun/namespace_windows.go

@@ -16,7 +16,6 @@ import (
 	"golang.org/x/sys/windows"
 	"golang.org/x/text/unicode/norm"
 
-	"golang.zx2c4.com/wireguard/ipc/winpipe"
 	"golang.zx2c4.com/wireguard/tun/wintun/namespaceapi"
 )
 
@@ -32,13 +31,13 @@ func initializeNamespace() error {
 	if hasInitializedNamespace {
 		return nil
 	}
-	sd, err := winpipe.SddlToSecurityDescriptor("O:SYD:P(A;;GA;;;SY)")
+	sd, err := windows.SecurityDescriptorFromString("O:SYD:P(A;;GA;;;SY)")
 	if err != nil {
 		return fmt.Errorf("SddlToSecurityDescriptor failed: %v", err)
 	}
 	wintunObjectSecurityAttributes = &windows.SecurityAttributes{
-		Length:             uint32(len(sd)),
+		Length:             uint32(unsafe.Sizeof(windows.SecurityAttributes{})),
-		SecurityDescriptor: uintptr(unsafe.Pointer(&sd[0])),
+		SecurityDescriptor: sd,
 	}
 	sid, err := windows.CreateWellKnownSid(windows.WinLocalSystemSid)
 	if err != nil {

tun/wintun/namespaceapi/mksyscall.go

@@ -5,4 +5,4 @@
 
 package namespaceapi
 
-//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go namespaceapi_windows.go
+//go:generate go run golang.org/x/sys/windows/mkwinsyscall -output zsyscall_windows.go namespaceapi_windows.go

tun/wintun/namespaceapi/namespaceapi_windows.go

@@ -40,7 +40,7 @@ func (bd *BoundaryDescriptor) AddSid(requiredSid *windows.SID) error {
 	return addSIDToBoundaryDescriptor((*windows.Handle)(bd), requiredSid)
 }
 
-// PrivateNamespace represents a private namespace. Duh?!
+// PrivateNamespace represents a private namespace.
 type PrivateNamespace windows.Handle
 
 // CreatePrivateNamespace creates a private namespace.

tun/wintun/nci/mksyscall.go

@@ -5,4 +5,4 @@
 
 package nci
 
-//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go nci_windows.go
+//go:generate go run golang.org/x/sys/windows/mkwinsyscall -output zsyscall_windows.go nci_windows.go

tun/wintun/registry/mksyscall.go

@@ -5,4 +5,4 @@
 
 package registry
 
-//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zregistry_windows.go registry_windows.go
+//go:generate go run golang.org/x/sys/windows/mkwinsyscall -output zregistry_windows.go registry_windows.go

tun/wintun/ring_windows.go

@@ -6,6 +6,7 @@
 package wintun
 
 import (
+	"runtime"
 	"unsafe"
 
 	"golang.org/x/sys/windows"
@@ -53,25 +54,44 @@ func PacketAlign(size uint32) uint32 {
 	return (size + (PacketAlignment - 1)) &^ (PacketAlignment - 1)
 }
 
-func (descriptor *RingDescriptor) Init() (err error) {
+func NewRingDescriptor() (descriptor *RingDescriptor, err error) {
+	descriptor = new(RingDescriptor)
+	allocatedRegion, err := windows.VirtualAlloc(0, unsafe.Sizeof(Ring{})*2, windows.MEM_COMMIT|windows.MEM_RESERVE, windows.PAGE_READWRITE)
+	if err != nil {
+		return
+	}
+	defer func() {
+		if err != nil {
+			descriptor.free()
+			descriptor = nil
+		}
+	}()
 	descriptor.Send.Size = uint32(unsafe.Sizeof(Ring{}))
-	descriptor.Send.Ring = &Ring{}
+	descriptor.Send.Ring = (*Ring)(unsafe.Pointer(allocatedRegion))
 	descriptor.Send.TailMoved, err = windows.CreateEvent(nil, 0, 0, nil)
 	if err != nil {
 		return
 	}
 
 	descriptor.Receive.Size = uint32(unsafe.Sizeof(Ring{}))
-	descriptor.Receive.Ring = &Ring{}
+	descriptor.Receive.Ring = (*Ring)(unsafe.Pointer(allocatedRegion + unsafe.Sizeof(Ring{})))
 	descriptor.Receive.TailMoved, err = windows.CreateEvent(nil, 0, 0, nil)
 	if err != nil {
 		windows.CloseHandle(descriptor.Send.TailMoved)
 		return
 	}
-
+	runtime.SetFinalizer(descriptor, func(d *RingDescriptor) { d.free() })
 	return
 }
 
+func (descriptor *RingDescriptor) free() {
+	if descriptor.Send.Ring != nil {
+		windows.VirtualFree(uintptr(unsafe.Pointer(descriptor.Send.Ring)), 0, windows.MEM_RELEASE)
+		descriptor.Send.Ring = nil
+		descriptor.Receive.Ring = nil
+	}
+}
+
 func (descriptor *RingDescriptor) Close() {
 	if descriptor.Send.TailMoved != 0 {
 		windows.CloseHandle(descriptor.Send.TailMoved)

tun/wintun/setupapi/mksyscall.go

@@ -5,4 +5,4 @@
 
 package setupapi
 
-//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsetupapi_windows.go setupapi_windows.go
+//go:generate go run golang.org/x/sys/windows/mkwinsyscall -output zsetupapi_windows.go setupapi_windows.go

tun/wintun/setupapi/types_windows.go

@@ -57,7 +57,7 @@ type DevInfoData struct {
 	_         uintptr
 }
 
-// DevInfoListDetailData is a structure for detailed information on a device information set (used for SetupDiGetDeviceInfoListDetail which supercedes the functionality of SetupDiGetDeviceInfoListClass).
+// DevInfoListDetailData is a structure for detailed information on a device information set (used for SetupDiGetDeviceInfoListDetail which supersedes the functionality of SetupDiGetDeviceInfoListClass).
 type DevInfoListDetailData struct {
 	size                uint32 // Warning: unsafe.Sizeof(DevInfoListDetailData) > sizeof(SP_DEVINFO_LIST_DETAIL_DATA) when GOARCH == 386 => use sizeofDevInfoListDetailData const.
 	ClassGUID           windows.GUID

tun/wintun/wintun_windows.go

@@ -40,9 +40,9 @@ const (
 )
 
 // makeWintun creates a Wintun interface handle and populates it from the device's registry key.
-func makeWintun(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData, pool Pool) (*Interface, error) {
+func makeWintun(devInfo setupapi.DevInfo, devInfoData *setupapi.DevInfoData, pool Pool) (*Interface, error) {
 	// Open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\<class>\<id> registry key.
-	key, err := deviceInfoSet.OpenDevRegKey(deviceInfoData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.QUERY_VALUE)
+	key, err := devInfo.OpenDevRegKey(devInfoData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.QUERY_VALUE)
 	if err != nil {
 		return nil, fmt.Errorf("Device-specific registry key open failed: %v", err)
 	}
@@ -72,7 +72,7 @@ func makeWintun(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfo
 		return nil, fmt.Errorf("RegQueryValue(\"*IfType\") failed: %v", err)
 	}
 
-	instanceID, err := deviceInfoSet.DeviceInstanceID(deviceInfoData)
+	instanceID, err := devInfo.DeviceInstanceID(devInfoData)
 	if err != nil {
 		return nil, fmt.Errorf("DeviceInstanceID failed: %v", err)
 	}
@@ -109,11 +109,11 @@ func (pool Pool) GetInterface(ifname string) (*Interface, error) {
 	}()
 
 	// Create a list of network devices.
-	devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
+	devInfo, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
 	if err != nil {
 		return nil, fmt.Errorf("SetupDiGetClassDevsEx(%v) failed: %v", deviceClassNetGUID, err)
 	}
-	defer devInfoList.Close()
+	defer devInfo.Close()
 
 	// Windows requires each interface to have a different name. When
 	// enforcing this, Windows treats interface names case-insensitive. If an
@@ -123,7 +123,7 @@ func (pool Pool) GetInterface(ifname string) (*Interface, error) {
 	ifname = strings.ToLower(ifname)
 
 	for index := 0; ; index++ {
-		deviceData, err := devInfoList.EnumDeviceInfo(index)
+		devInfoData, err := devInfo.EnumDeviceInfo(index)
 		if err != nil {
 			if err == windows.ERROR_NO_MORE_ITEMS {
 				break
@@ -131,7 +131,16 @@ func (pool Pool) GetInterface(ifname string) (*Interface, error) {
 			continue
 		}
 
-		wintun, err := makeWintun(devInfoList, deviceData, pool)
+		// Check the Hardware ID to make sure it's a real Wintun device first. This avoids doing slow operations on non-Wintun devices.
+		property, err := devInfo.DeviceRegistryProperty(devInfoData, setupapi.SPDRP_HARDWAREID)
+		if err != nil {
+			continue
+		}
+		if hwids, ok := property.([]string); ok && len(hwids) > 0 && hwids[0] != hardwareID {
+			continue
+		}
+
+		wintun, err := makeWintun(devInfo, devInfoData, pool)
 		if err != nil {
 			continue
 		}
@@ -145,14 +154,14 @@ func (pool Pool) GetInterface(ifname string) (*Interface, error) {
 		ifname3 := removeNumberedSuffix(ifname2)
 
 		if ifname == ifname2 || ifname == ifname3 {
-			err = devInfoList.BuildDriverInfoList(deviceData, setupapi.SPDIT_COMPATDRIVER)
+			err = devInfo.BuildDriverInfoList(devInfoData, setupapi.SPDIT_COMPATDRIVER)
 			if err != nil {
 				return nil, fmt.Errorf("SetupDiBuildDriverInfoList failed: %v", err)
 			}
-			defer devInfoList.DestroyDriverInfoList(deviceData, setupapi.SPDIT_COMPATDRIVER)
+			defer devInfo.DestroyDriverInfoList(devInfoData, setupapi.SPDIT_COMPATDRIVER)
 
 			for index := 0; ; index++ {
-				driverData, err := devInfoList.EnumDriverInfo(deviceData, setupapi.SPDIT_COMPATDRIVER, index)
+				driverData, err := devInfo.EnumDriverInfo(devInfoData, setupapi.SPDIT_COMPATDRIVER, index)
 				if err != nil {
 					if err == windows.ERROR_NO_MORE_ITEMS {
 						break
@@ -161,13 +170,13 @@ func (pool Pool) GetInterface(ifname string) (*Interface, error) {
 				}
 
 				// Get driver info details.
-				driverDetailData, err := devInfoList.DriverInfoDetail(deviceData, driverData)
+				driverDetailData, err := devInfo.DriverInfoDetail(devInfoData, driverData)
 				if err != nil {
 					continue
 				}
 
 				if driverDetailData.IsCompatible(hardwareID) {
-					isMember, err := pool.isMember(devInfoList, deviceData)
+					isMember, err := pool.isMember(devInfo, devInfoData)
 					if err != nil {
 						return nil, err
 					}
@@ -206,12 +215,12 @@ func (pool Pool) CreateInterface(ifname string, requestedGUID *windows.GUID) (wi
 	}()
 
 	// Create an empty device info set for network adapter device class.
-	devInfoList, err := setupapi.SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, 0, "")
+	devInfo, err := setupapi.SetupDiCreateDeviceInfoListEx(&deviceClassNetGUID, 0, "")
 	if err != nil {
 		err = fmt.Errorf("SetupDiCreateDeviceInfoListEx(%v) failed: %v", deviceClassNetGUID, err)
 		return
 	}
-	defer devInfoList.Close()
+	defer devInfo.Close()
 
 	// Get the device class name from GUID.
 	className, err := setupapi.SetupDiClassNameFromGuidEx(&deviceClassNetGUID, "")
@@ -222,43 +231,43 @@ func (pool Pool) CreateInterface(ifname string, requestedGUID *windows.GUID) (wi
 
 	// Create a new device info element and add it to the device info set.
 	deviceTypeName := pool.deviceTypeName()
-	deviceData, err := devInfoList.CreateDeviceInfo(className, &deviceClassNetGUID, deviceTypeName, 0, setupapi.DICD_GENERATE_ID)
+	devInfoData, err := devInfo.CreateDeviceInfo(className, &deviceClassNetGUID, deviceTypeName, 0, setupapi.DICD_GENERATE_ID)
 	if err != nil {
 		err = fmt.Errorf("SetupDiCreateDeviceInfo failed: %v", err)
 		return
 	}
 
-	err = setQuietInstall(devInfoList, deviceData)
+	err = setQuietInstall(devInfo, devInfoData)
 	if err != nil {
 		err = fmt.Errorf("Setting quiet installation failed: %v", err)
 		return
 	}
 
 	// Set a device information element as the selected member of a device information set.
-	err = devInfoList.SetSelectedDevice(deviceData)
+	err = devInfo.SetSelectedDevice(devInfoData)
 	if err != nil {
 		err = fmt.Errorf("SetupDiSetSelectedDevice failed: %v", err)
 		return
 	}
 
 	// Set Plug&Play device hardware ID property.
-	err = devInfoList.SetDeviceRegistryPropertyString(deviceData, setupapi.SPDRP_HARDWAREID, hardwareID)
+	err = devInfo.SetDeviceRegistryPropertyString(devInfoData, setupapi.SPDRP_HARDWAREID, hardwareID)
 	if err != nil {
 		err = fmt.Errorf("SetupDiSetDeviceRegistryProperty(SPDRP_HARDWAREID) failed: %v", err)
 		return
 	}
 
-	err = devInfoList.BuildDriverInfoList(deviceData, setupapi.SPDIT_COMPATDRIVER) // TODO: This takes ~510ms
+	err = devInfo.BuildDriverInfoList(devInfoData, setupapi.SPDIT_COMPATDRIVER) // TODO: This takes ~510ms
 	if err != nil {
 		err = fmt.Errorf("SetupDiBuildDriverInfoList failed: %v", err)
 		return
 	}
-	defer devInfoList.DestroyDriverInfoList(deviceData, setupapi.SPDIT_COMPATDRIVER)
+	defer devInfo.DestroyDriverInfoList(devInfoData, setupapi.SPDIT_COMPATDRIVER)
 
 	driverDate := windows.Filetime{}
 	driverVersion := uint64(0)
 	for index := 0; ; index++ { // TODO: This loop takes ~600ms
-		driverData, err := devInfoList.EnumDriverInfo(deviceData, setupapi.SPDIT_COMPATDRIVER, index)
+		driverData, err := devInfo.EnumDriverInfo(devInfoData, setupapi.SPDIT_COMPATDRIVER, index)
 		if err != nil {
 			if err == windows.ERROR_NO_MORE_ITEMS {
 				break
@@ -268,13 +277,13 @@ func (pool Pool) CreateInterface(ifname string, requestedGUID *windows.GUID) (wi
 
 		// Check the driver version first, since the check is trivial and will save us iterating over hardware IDs for any driver versioned prior our best match.
 		if driverData.IsNewer(driverDate, driverVersion) {
-			driverDetailData, err := devInfoList.DriverInfoDetail(deviceData, driverData)
+			driverDetailData, err := devInfo.DriverInfoDetail(devInfoData, driverData)
 			if err != nil {
 				continue
 			}
 
 			if driverDetailData.IsCompatible(hardwareID) {
-				err := devInfoList.SetSelectedDriver(deviceData, driverData)
+				err := devInfo.SetSelectedDriver(devInfoData, driverData)
 				if err != nil {
 					continue
 				}
@@ -299,10 +308,10 @@ func (pool Pool) CreateInterface(ifname string, requestedGUID *windows.GUID) (wi
 			}
 
 			// Set class installer parameters for DIF_REMOVE.
-			if devInfoList.SetClassInstallParams(deviceData, &removeDeviceParams.ClassInstallHeader, uint32(unsafe.Sizeof(removeDeviceParams))) == nil {
+			if devInfo.SetClassInstallParams(devInfoData, &removeDeviceParams.ClassInstallHeader, uint32(unsafe.Sizeof(removeDeviceParams))) == nil {
 				// Call appropriate class installer.
-				if devInfoList.CallClassInstaller(setupapi.DIF_REMOVE, deviceData) == nil {
+				if devInfo.CallClassInstaller(setupapi.DIF_REMOVE, devInfoData) == nil {
-					rebootRequired = rebootRequired || checkReboot(devInfoList, deviceData)
+					rebootRequired = rebootRequired || checkReboot(devInfo, devInfoData)
 				}
 			}
 
@@ -311,14 +320,14 @@ func (pool Pool) CreateInterface(ifname string, requestedGUID *windows.GUID) (wi
 	}()
 
 	// Call appropriate class installer.
-	err = devInfoList.CallClassInstaller(setupapi.DIF_REGISTERDEVICE, deviceData)
+	err = devInfo.CallClassInstaller(setupapi.DIF_REGISTERDEVICE, devInfoData)
 	if err != nil {
 		err = fmt.Errorf("SetupDiCallClassInstaller(DIF_REGISTERDEVICE) failed: %v", err)
 		return
 	}
 
 	// Register device co-installers if any. (Ignore errors)
-	devInfoList.CallClassInstaller(setupapi.DIF_REGISTER_COINSTALLERS, deviceData)
+	devInfo.CallClassInstaller(setupapi.DIF_REGISTER_COINSTALLERS, devInfoData)
 
 	var netDevRegKey registry.Key
 	const pollTimeout = time.Millisecond * 50
@@ -326,7 +335,7 @@ func (pool Pool) CreateInterface(ifname string, requestedGUID *windows.GUID) (wi
 		if i != 0 {
 			time.Sleep(pollTimeout)
 		}
-		netDevRegKey, err = devInfoList.OpenDevRegKey(deviceData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.SET_VALUE|registry.QUERY_VALUE|registry.NOTIFY)
+		netDevRegKey, err = devInfo.OpenDevRegKey(devInfoData, setupapi.DICS_FLAG_GLOBAL, 0, setupapi.DIREG_DRV, registry.SET_VALUE|registry.QUERY_VALUE|registry.NOTIFY)
 		if err == nil {
 			break
 		}
@@ -345,17 +354,17 @@ func (pool Pool) CreateInterface(ifname string, requestedGUID *windows.GUID) (wi
 	}
 
 	// Install interfaces if any. (Ignore errors)
-	devInfoList.CallClassInstaller(setupapi.DIF_INSTALLINTERFACES, deviceData)
+	devInfo.CallClassInstaller(setupapi.DIF_INSTALLINTERFACES, devInfoData)
 
 	// Install the device.
-	err = devInfoList.CallClassInstaller(setupapi.DIF_INSTALLDEVICE, deviceData)
+	err = devInfo.CallClassInstaller(setupapi.DIF_INSTALLDEVICE, devInfoData)
 	if err != nil {
 		err = fmt.Errorf("SetupDiCallClassInstaller(DIF_INSTALLDEVICE) failed: %v", err)
 		return
 	}
-	rebootRequired = checkReboot(devInfoList, deviceData)
+	rebootRequired = checkReboot(devInfo, devInfoData)
 
-	err = devInfoList.SetDeviceRegistryPropertyString(deviceData, setupapi.SPDRP_DEVICEDESC, deviceTypeName)
+	err = devInfo.SetDeviceRegistryPropertyString(devInfoData, setupapi.SPDRP_DEVICEDESC, deviceTypeName)
 	if err != nil {
 		err = fmt.Errorf("SetDeviceRegistryPropertyString(SPDRP_DEVICEDESC) failed: %v", err)
 		return
@@ -381,7 +390,7 @@ func (pool Pool) CreateInterface(ifname string, requestedGUID *windows.GUID) (wi
 	}
 
 	// Get network interface.
-	wintun, err = makeWintun(devInfoList, deviceData, pool)
+	wintun, err = makeWintun(devInfo, devInfoData, pool)
 	if err != nil {
 		err = fmt.Errorf("makeWintun failed: %v", err)
 		return
@@ -435,14 +444,14 @@ func (pool Pool) CreateInterface(ifname string, requestedGUID *windows.GUID) (wi
 // if the interface was not found. It returns a bool indicating whether
 // a reboot is required.
 func (wintun *Interface) DeleteInterface() (rebootRequired bool, err error) {
-	devInfoList, deviceData, err := wintun.deviceData()
+	devInfo, devInfoData, err := wintun.devInfoData()
 	if err == windows.ERROR_OBJECT_NOT_FOUND {
 		return false, nil
 	}
 	if err != nil {
 		return false, err
 	}
-	defer devInfoList.Close()
+	defer devInfo.Close()
 
 	// Remove the device.
 	removeDeviceParams := setupapi.RemoveDeviceParams{
@@ -451,18 +460,18 @@ func (wintun *Interface) DeleteInterface() (rebootRequired bool, err error) {
 	}
 
 	// Set class installer parameters for DIF_REMOVE.
-	err = devInfoList.SetClassInstallParams(deviceData, &removeDeviceParams.ClassInstallHeader, uint32(unsafe.Sizeof(removeDeviceParams)))
+	err = devInfo.SetClassInstallParams(devInfoData, &removeDeviceParams.ClassInstallHeader, uint32(unsafe.Sizeof(removeDeviceParams)))
 	if err != nil {
 		return false, fmt.Errorf("SetupDiSetClassInstallParams failed: %v", err)
 	}
 
 	// Call appropriate class installer.
-	err = devInfoList.CallClassInstaller(setupapi.DIF_REMOVE, deviceData)
+	err = devInfo.CallClassInstaller(setupapi.DIF_REMOVE, devInfoData)
 	if err != nil {
 		return false, fmt.Errorf("SetupDiCallClassInstaller failed: %v", err)
 	}
 
-	return checkReboot(devInfoList, deviceData), nil
+	return checkReboot(devInfo, devInfoData), nil
 }
 
 // DeleteMatchingInterfaces deletes all Wintun interfaces, which match
@@ -479,14 +488,14 @@ func (pool Pool) DeleteMatchingInterfaces(matches func(wintun *Interface) bool)
 		windows.CloseHandle(mutex)
 	}()
 
-	devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
+	devInfo, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
 	if err != nil {
 		return nil, false, []error{fmt.Errorf("SetupDiGetClassDevsEx(%v) failed: %v", deviceClassNetGUID, err.Error())}
 	}
-	defer devInfoList.Close()
+	defer devInfo.Close()
 
 	for i := 0; ; i++ {
-		deviceData, err := devInfoList.EnumDeviceInfo(i)
+		devInfoData, err := devInfo.EnumDeviceInfo(i)
 		if err != nil {
 			if err == windows.ERROR_NO_MORE_ITEMS {
 				break
@@ -494,22 +503,31 @@ func (pool Pool) DeleteMatchingInterfaces(matches func(wintun *Interface) bool)
 			continue
 		}
 
-		err = devInfoList.BuildDriverInfoList(deviceData, setupapi.SPDIT_COMPATDRIVER)
+		// Check the Hardware ID to make sure it's a real Wintun device first. This avoids doing slow operations on non-Wintun devices.
+		property, err := devInfo.DeviceRegistryProperty(devInfoData, setupapi.SPDRP_HARDWAREID)
 		if err != nil {
 			continue
 		}
-		defer devInfoList.DestroyDriverInfoList(deviceData, setupapi.SPDIT_COMPATDRIVER)
+		if hwids, ok := property.([]string); ok && len(hwids) > 0 && hwids[0] != hardwareID {
+			continue
+		}
+
+		err = devInfo.BuildDriverInfoList(devInfoData, setupapi.SPDIT_COMPATDRIVER)
+		if err != nil {
+			continue
+		}
+		defer devInfo.DestroyDriverInfoList(devInfoData, setupapi.SPDIT_COMPATDRIVER)
 
 		isWintun := false
 		for j := 0; ; j++ {
-			driverData, err := devInfoList.EnumDriverInfo(deviceData, setupapi.SPDIT_COMPATDRIVER, j)
+			driverData, err := devInfo.EnumDriverInfo(devInfoData, setupapi.SPDIT_COMPATDRIVER, j)
 			if err != nil {
 				if err == windows.ERROR_NO_MORE_ITEMS {
 					break
 				}
 				continue
 			}
-			driverDetailData, err := devInfoList.DriverInfoDetail(deviceData, driverData)
+			driverDetailData, err := devInfo.DriverInfoDetail(devInfoData, driverData)
 			if err != nil {
 				continue
 			}
@@ -522,7 +540,7 @@ func (pool Pool) DeleteMatchingInterfaces(matches func(wintun *Interface) bool)
 			continue
 		}
 
-		isMember, err := pool.isMember(devInfoList, deviceData)
+		isMember, err := pool.isMember(devInfo, devInfoData)
 		if err != nil {
 			errors = append(errors, err)
 			continue
@@ -531,7 +549,7 @@ func (pool Pool) DeleteMatchingInterfaces(matches func(wintun *Interface) bool)
 			continue
 		}
 
-		wintun, err := makeWintun(devInfoList, deviceData, pool)
+		wintun, err := makeWintun(devInfo, devInfoData, pool)
 		if err != nil {
 			errors = append(errors, fmt.Errorf("Unable to make Wintun interface object: %v", err))
 			continue
@@ -540,41 +558,41 @@ func (pool Pool) DeleteMatchingInterfaces(matches func(wintun *Interface) bool)
 			continue
 		}
 
-		err = setQuietInstall(devInfoList, deviceData)
+		err = setQuietInstall(devInfo, devInfoData)
 		if err != nil {
 			errors = append(errors, err)
 			continue
 		}
 
-		inst := deviceData.DevInst
+		inst := devInfoData.DevInst
 		removeDeviceParams := setupapi.RemoveDeviceParams{
 			ClassInstallHeader: *setupapi.MakeClassInstallHeader(setupapi.DIF_REMOVE),
 			Scope:              setupapi.DI_REMOVEDEVICE_GLOBAL,
 		}
-		err = devInfoList.SetClassInstallParams(deviceData, &removeDeviceParams.ClassInstallHeader, uint32(unsafe.Sizeof(removeDeviceParams)))
+		err = devInfo.SetClassInstallParams(devInfoData, &removeDeviceParams.ClassInstallHeader, uint32(unsafe.Sizeof(removeDeviceParams)))
 		if err != nil {
 			errors = append(errors, err)
 			continue
 		}
-		err = devInfoList.CallClassInstaller(setupapi.DIF_REMOVE, deviceData)
+		err = devInfo.CallClassInstaller(setupapi.DIF_REMOVE, devInfoData)
 		if err != nil {
 			errors = append(errors, err)
 			continue
 		}
-		rebootRequired = rebootRequired || checkReboot(devInfoList, deviceData)
+		rebootRequired = rebootRequired || checkReboot(devInfo, devInfoData)
 		deviceInstancesDeleted = append(deviceInstancesDeleted, inst)
 	}
 	return
 }
 
 // isMember checks if SPDRP_DEVICEDESC or SPDRP_FRIENDLYNAME match device type name.
-func (pool Pool) isMember(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData) (bool, error) {
+func (pool Pool) isMember(devInfo setupapi.DevInfo, devInfoData *setupapi.DevInfoData) (bool, error) {
-	deviceDescVal, err := deviceInfoSet.DeviceRegistryProperty(deviceInfoData, setupapi.SPDRP_DEVICEDESC)
+	deviceDescVal, err := devInfo.DeviceRegistryProperty(devInfoData, setupapi.SPDRP_DEVICEDESC)
 	if err != nil {
 		return false, fmt.Errorf("DeviceRegistryPropertyString(SPDRP_DEVICEDESC) failed: %v", err)
 	}
 	deviceDesc, _ := deviceDescVal.(string)
-	friendlyNameVal, err := deviceInfoSet.DeviceRegistryProperty(deviceInfoData, setupapi.SPDRP_FRIENDLYNAME)
+	friendlyNameVal, err := devInfo.DeviceRegistryProperty(devInfoData, setupapi.SPDRP_FRIENDLYNAME)
 	if err != nil {
 		return false, fmt.Errorf("DeviceRegistryPropertyString(SPDRP_FRIENDLYNAME) failed: %v", err)
 	}
@@ -585,8 +603,8 @@ func (pool Pool) isMember(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupa
 }
 
 // checkReboot checks device install parameters if a system reboot is required.
-func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData) bool {
+func checkReboot(devInfo setupapi.DevInfo, devInfoData *setupapi.DevInfoData) bool {
-	devInstallParams, err := deviceInfoSet.DeviceInstallParams(deviceInfoData)
+	devInstallParams, err := devInfo.DeviceInstallParams(devInfoData)
 	if err != nil {
 		return false
 	}
@@ -595,14 +613,14 @@ func checkReboot(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInf
 }
 
 // setQuietInstall sets device install parameters for a quiet installation
-func setQuietInstall(deviceInfoSet setupapi.DevInfo, deviceInfoData *setupapi.DevInfoData) error {
+func setQuietInstall(devInfo setupapi.DevInfo, devInfoData *setupapi.DevInfoData) error {
-	devInstallParams, err := deviceInfoSet.DeviceInstallParams(deviceInfoData)
+	devInstallParams, err := devInfo.DeviceInstallParams(devInfoData)
 	if err != nil {
 		return err
 	}
 
 	devInstallParams.Flags |= setupapi.DI_QUIETINSTALL
-	return deviceInfoSet.SetDeviceInstallParams(deviceInfoData, devInstallParams)
+	return devInfo.SetDeviceInstallParams(devInfoData, devInstallParams)
 }
 
 // deviceTypeName returns pool-specific device type name.
@@ -671,11 +689,39 @@ func (wintun *Interface) tcpipAdapterRegKeyName() string {
 	return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Adapters\\%v", wintun.cfgInstanceID)
 }
 
-// deviceRegKeyName returns the device-level registry key name
+// deviceRegKeyName returns the device-level registry key name.
 func (wintun *Interface) deviceRegKeyName() string {
 	return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Enum\\%v", wintun.devInstanceID)
 }
 
+// Version returns the version of the Wintun driver and NDIS system currently loaded.
+func (wintun *Interface) Version() (driverVersion string, ndisVersion string, err error) {
+	key, err := registry.OpenKey(registry.LOCAL_MACHINE, "SYSTEM\\CurrentControlSet\\Services\\Wintun", registry.QUERY_VALUE)
+	if err != nil {
+		return
+	}
+	defer key.Close()
+	driverMajor, _, err := key.GetIntegerValue("DriverMajorVersion")
+	if err != nil {
+		return
+	}
+	driverMinor, _, err := key.GetIntegerValue("DriverMinorVersion")
+	if err != nil {
+		return
+	}
+	ndisMajor, _, err := key.GetIntegerValue("NdisMajorVersion")
+	if err != nil {
+		return
+	}
+	ndisMinor, _, err := key.GetIntegerValue("NdisMinorVersion")
+	if err != nil {
+		return
+	}
+	driverVersion = fmt.Sprintf("%d.%d", driverMajor, driverMinor)
+	ndisVersion = fmt.Sprintf("%d.%d", ndisMajor, ndisMinor)
+	return
+}
+
 // tcpipInterfaceRegKeyName returns the interface-specific TCP/IP network registry key name.
 func (wintun *Interface) tcpipInterfaceRegKeyName() (path string, err error) {
 	key, err := registry.OpenKey(registry.LOCAL_MACHINE, wintun.tcpipAdapterRegKeyName(), registry.QUERY_VALUE)
@@ -693,18 +739,18 @@ func (wintun *Interface) tcpipInterfaceRegKeyName() (path string, err error) {
 	return fmt.Sprintf("SYSTEM\\CurrentControlSet\\Services\\%s", paths[0]), nil
 }
 
-// deviceData returns TUN device info list handle and interface device info
+// devInfoData returns TUN device info list handle and interface device info
 // data. The device info list handle must be closed after use. In case the
 // device is not found, windows.ERROR_OBJECT_NOT_FOUND is returned.
-func (wintun *Interface) deviceData() (setupapi.DevInfo, *setupapi.DevInfoData, error) {
+func (wintun *Interface) devInfoData() (setupapi.DevInfo, *setupapi.DevInfoData, error) {
 	// Create a list of network devices.
-	devInfoList, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
+	devInfo, err := setupapi.SetupDiGetClassDevsEx(&deviceClassNetGUID, "", 0, setupapi.DIGCF_PRESENT, setupapi.DevInfo(0), "")
 	if err != nil {
 		return 0, nil, fmt.Errorf("SetupDiGetClassDevsEx(%v) failed: %v", deviceClassNetGUID, err.Error())
 	}
 
 	for index := 0; ; index++ {
-		deviceData, err := devInfoList.EnumDeviceInfo(index)
+		devInfoData, err := devInfo.EnumDeviceInfo(index)
 		if err != nil {
 			if err == windows.ERROR_NO_MORE_ITEMS {
 				break
@@ -714,22 +760,22 @@ func (wintun *Interface) deviceData() (setupapi.DevInfo, *setupapi.DevInfoData,
 
 		// Get interface ID.
 		// TODO: Store some ID in the Wintun object such that this call isn't required.
-		wintun2, err := makeWintun(devInfoList, deviceData, wintun.pool)
+		wintun2, err := makeWintun(devInfo, devInfoData, wintun.pool)
 		if err != nil {
 			continue
 		}
 
 		if wintun.cfgInstanceID == wintun2.cfgInstanceID {
-			err = setQuietInstall(devInfoList, deviceData)
+			err = setQuietInstall(devInfo, devInfoData)
 			if err != nil {
-				devInfoList.Close()
+				devInfo.Close()
 				return 0, nil, fmt.Errorf("Setting quiet installation failed: %v", err)
 			}
-			return devInfoList, deviceData, nil
+			return devInfo, devInfoData, nil
 		}
 	}
 
-	devInfoList.Close()
+	devInfo.Close()
 	return 0, nil, windows.ERROR_OBJECT_NOT_FOUND
 }