Separate out mark setting for Windows

conn_default.go

@@ -8,10 +8,8 @@
 package main
 
 import (
-	"golang.org/x/sys/unix"
 	"net"
 	"os"
-	"runtime"
 	"syscall"
 )
 
@@ -171,47 +169,3 @@ func (bind *NativeBind) Send(buff []byte, endpoint Endpoint) error {
 	}
 	return err
 }
-
-var fwmarkIoctl int
-
-func init() {
-	switch runtime.GOOS {
-	case "linux", "android":
-		fwmarkIoctl = 36 /* unix.SO_MARK */
-	case "freebsd":
-		fwmarkIoctl = 0x1015 /* unix.SO_USER_COOKIE */
-	case "openbsd":
-		fwmarkIoctl = 0x1021 /* unix.SO_RTABLE */
-	}
-}
-
-func (bind *NativeBind) SetMark(mark uint32) error {
-	if fwmarkIoctl == 0 {
-		return nil
-	}
-	if bind.ipv4 != nil {
-		fd, err := bind.ipv4.SyscallConn()
-		if err != nil {
-			return err
-		}
-		err = fd.Control(func(fd uintptr) {
-			err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
-		})
-		if err != nil {
-			return err
-		}
-	}
-	if bind.ipv6 != nil {
-		fd, err := bind.ipv6.SyscallConn()
-		if err != nil {
-			return err
-		}
-		err = fd.Control(func(fd uintptr) {
-			err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
-		})
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

mark_default.go

@@ -0,0 +1,12 @@
+// +build !linux,!openbsd,!freebsd
+
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2017-2018 WireGuard LLC. All Rights Reserved.
+ */
+
+package main
+
+func (bind *NativeBind) SetMark(mark uint32) error {
+	return nil
+}

mark_unix.go

@@ -0,0 +1,57 @@
+// +build android openbsd freebsd
+
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2017-2018 WireGuard LLC. All Rights Reserved.
+ */
+
+package main
+
+import (
+	"golang.org/x/sys/unix"
+	"runtime"
+)
+
+var fwmarkIoctl int
+
+func init() {
+	switch runtime.GOOS {
+	case "linux", "android":
+		fwmarkIoctl = 36 /* unix.SO_MARK */
+	case "freebsd":
+		fwmarkIoctl = 0x1015 /* unix.SO_USER_COOKIE */
+	case "openbsd":
+		fwmarkIoctl = 0x1021 /* unix.SO_RTABLE */
+	}
+}
+
+func (bind *NativeBind) SetMark(mark uint32) error {
+	if fwmarkIoctl == 0 {
+		return nil
+	}
+	if bind.ipv4 != nil {
+		fd, err := bind.ipv4.SyscallConn()
+		if err != nil {
+			return err
+		}
+		err = fd.Control(func(fd uintptr) {
+			err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
+		})
+		if err != nil {
+			return err
+		}
+	}
+	if bind.ipv6 != nil {
+		fd, err := bind.ipv6.SyscallConn()
+		if err != nil {
+			return err
+		}
+		err = fd.Control(func(fd uintptr) {
+			err = unix.SetsockoptInt(int(fd), unix.SOL_SOCKET, fwmarkIoctl, int(mark))
+		})
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}