diff --git a/tun/wintun/namespaceapi/mksyscall.go b/tun/wintun/namespaceapi/mksyscall.go
new file mode 100644
index 0000000..c4c9595
--- /dev/null
+++ b/tun/wintun/namespaceapi/mksyscall.go
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package namespaceapi
+
+//go:generate go run $GOROOT/src/syscall/mksyscall_windows.go -output zsyscall_windows.go namespaceapi_windows.go
diff --git a/tun/wintun/namespaceapi/namespaceapi_windows.go b/tun/wintun/namespaceapi/namespaceapi_windows.go
new file mode 100644
index 0000000..a7637ae
--- /dev/null
+++ b/tun/wintun/namespaceapi/namespaceapi_windows.go
@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
+ */
+
+package namespaceapi
+
+import "golang.org/x/sys/windows"
+
+//sys	createBoundaryDescriptor(name *uint16, flags uint32) (handle windows.Handle, err error) = kernel32.CreateBoundaryDescriptorW
+//sys	deleteBoundaryDescriptor(boundaryDescriptor windows.Handle) = kernel32.DeleteBoundaryDescriptor
+//sys	addSIDToBoundaryDescriptor(boundaryDescriptor windows.Handle, requiredSid *windows.SID) (err error) = kernel32.AddSIDToBoundaryDescriptor
+//sys	createPrivateNamespace(privateNamespaceAttributes *windows.SecurityAttributes, boundaryDescriptor windows.Handle, aliasPrefix *uint16) (handle windows.Handle, err error) = kernel32.CreatePrivateNamespaceW
+//sys	openPrivateNamespace(boundaryDescriptor windows.Handle, aliasPrefix *uint16) (handle windows.Handle, err error) = kernel32.OpenPrivateNamespaceW
+//sys	closePrivateNamespace(handle windows.Handle, flags uint32) (err error) = kernel32.ClosePrivateNamespace
+
+// BoundaryDescriptor represents a boundary that defines how the objects in the namespace are to be isolated.
+type BoundaryDescriptor windows.Handle
+
+// CreateBoundaryDescriptor creates a boundary descriptor.
+func CreateBoundaryDescriptor(name string) (BoundaryDescriptor, error) {
+	name16, err := windows.UTF16PtrFromString(name)
+	if err != nil {
+		return 0, err
+	}
+	handle, err := createBoundaryDescriptor(name16, 0)
+	if err != nil {
+		return 0, err
+	}
+	return BoundaryDescriptor(handle), nil
+}
+
+// Delete deletes the specified boundary descriptor.
+func (bd BoundaryDescriptor) Delete() {
+	deleteBoundaryDescriptor(windows.Handle(bd))
+}
+
+// AddSid adds a security identifier (SID) to the specified boundary descriptor.
+func (bd BoundaryDescriptor) AddSid(requiredSid *windows.SID) error {
+	return addSIDToBoundaryDescriptor(windows.Handle(bd), requiredSid)
+}
+
+// PrivateNamespace represents a private namespace. Duh?!
+type PrivateNamespace windows.Handle
+
+// CreatePrivateNamespace creates a private namespace.
+func CreatePrivateNamespace(privateNamespaceAttributes *windows.SecurityAttributes, boundaryDescriptor BoundaryDescriptor, aliasPrefix string) (PrivateNamespace, error) {
+	aliasPrefix16, err := windows.UTF16PtrFromString(aliasPrefix)
+	if err != nil {
+		return 0, err
+	}
+	handle, err := createPrivateNamespace(privateNamespaceAttributes, windows.Handle(boundaryDescriptor), aliasPrefix16)
+	if err != nil {
+		return 0, err
+	}
+	return PrivateNamespace(handle), nil
+}
+
+// OpenPrivateNamespace opens a private namespace.
+func OpenPrivateNamespace(boundaryDescriptor BoundaryDescriptor, aliasPrefix string) (PrivateNamespace, error) {
+	aliasPrefix16, err := windows.UTF16PtrFromString(aliasPrefix)
+	if err != nil {
+		return 0, err
+	}
+	handle, err := openPrivateNamespace(windows.Handle(boundaryDescriptor), aliasPrefix16)
+	if err != nil {
+		return 0, err
+	}
+	return PrivateNamespace(handle), nil
+}
+
+// ClosePrivateNamespaceFlags describes flags that are used by PrivateNamespace's Close() method.
+type ClosePrivateNamespaceFlags uint32
+
+const (
+	// PrivateNamespaceFlagDestroy makes the close to destroy the namespace.
+	PrivateNamespaceFlagDestroy = ClosePrivateNamespaceFlags(0x1)
+)
+
+// Close closes an open namespace handle.
+func (pns PrivateNamespace) Close(flags ClosePrivateNamespaceFlags) error {
+	return closePrivateNamespace(windows.Handle(pns), uint32(flags))
+}
diff --git a/tun/wintun/namespaceapi/zsyscall_windows.go b/tun/wintun/namespaceapi/zsyscall_windows.go
new file mode 100644
index 0000000..83295e1
--- /dev/null
+++ b/tun/wintun/namespaceapi/zsyscall_windows.go
@@ -0,0 +1,116 @@
+// Code generated by 'go generate'; DO NOT EDIT.
+
+package namespaceapi
+
+import (
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/windows"
+)
+
+var _ unsafe.Pointer
+
+// Do the interface allocations only once for common
+// Errno values.
+const (
+	errnoERROR_IO_PENDING = 997
+)
+
+var (
+	errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case errnoERROR_IO_PENDING:
+		return errERROR_IO_PENDING
+	}
+	// TODO: add more here, after collecting data on the common
+	// error values see on Windows. (perhaps when running
+	// all.bat?)
+	return e
+}
+
+var (
+	modkernel32 = windows.NewLazySystemDLL("kernel32.dll")
+
+	procCreateBoundaryDescriptorW  = modkernel32.NewProc("CreateBoundaryDescriptorW")
+	procDeleteBoundaryDescriptor   = modkernel32.NewProc("DeleteBoundaryDescriptor")
+	procAddSIDToBoundaryDescriptor = modkernel32.NewProc("AddSIDToBoundaryDescriptor")
+	procCreatePrivateNamespaceW    = modkernel32.NewProc("CreatePrivateNamespaceW")
+	procOpenPrivateNamespaceW      = modkernel32.NewProc("OpenPrivateNamespaceW")
+	procClosePrivateNamespace      = modkernel32.NewProc("ClosePrivateNamespace")
+)
+
+func createBoundaryDescriptor(name *uint16, flags uint32) (handle windows.Handle, err error) {
+	r0, _, e1 := syscall.Syscall(procCreateBoundaryDescriptorW.Addr(), 2, uintptr(unsafe.Pointer(name)), uintptr(flags), 0)
+	handle = windows.Handle(r0)
+	if handle == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func deleteBoundaryDescriptor(boundaryDescriptor windows.Handle) {
+	syscall.Syscall(procDeleteBoundaryDescriptor.Addr(), 1, uintptr(boundaryDescriptor), 0, 0)
+	return
+}
+
+func addSIDToBoundaryDescriptor(boundaryDescriptor windows.Handle, requiredSid *windows.SID) (err error) {
+	r1, _, e1 := syscall.Syscall(procAddSIDToBoundaryDescriptor.Addr(), 2, uintptr(boundaryDescriptor), uintptr(unsafe.Pointer(requiredSid)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func createPrivateNamespace(privateNamespaceAttributes *windows.SecurityAttributes, boundaryDescriptor windows.Handle, aliasPrefix *uint16) (handle windows.Handle, err error) {
+	r0, _, e1 := syscall.Syscall(procCreatePrivateNamespaceW.Addr(), 3, uintptr(unsafe.Pointer(privateNamespaceAttributes)), uintptr(boundaryDescriptor), uintptr(unsafe.Pointer(aliasPrefix)))
+	handle = windows.Handle(r0)
+	if handle == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func openPrivateNamespace(boundaryDescriptor windows.Handle, aliasPrefix *uint16) (handle windows.Handle, err error) {
+	r0, _, e1 := syscall.Syscall(procOpenPrivateNamespaceW.Addr(), 2, uintptr(boundaryDescriptor), uintptr(unsafe.Pointer(aliasPrefix)), 0)
+	handle = windows.Handle(r0)
+	if handle == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func closePrivateNamespace(handle windows.Handle, flags uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procClosePrivateNamespace.Addr(), 2, uintptr(handle), uintptr(flags), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}