Make socket mark functions linux exclusive

util/net/net.go

@@ -1,38 +1,6 @@
 package net
 
-import (
-	"fmt"
-	"syscall"
-)
-
 const (
 	// NetbirdFwmark is the fwmark value used by Netbird via wireguard
 	NetbirdFwmark = 0x1BD00
 )
-
-// SetSocketMark sets the SO_MARK option on the given socket connection
-func SetSocketMark(conn syscall.Conn) error {
-	sysconn, err := conn.SyscallConn()
-	if err != nil {
-		return fmt.Errorf("get raw conn: %w", err)
-	}
-
-	return SetRawSocketMark(sysconn)
-}
-
-func SetRawSocketMark(conn syscall.RawConn) error {
-	var setErr error
-
-	err := conn.Control(func(fd uintptr) {
-		setErr = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, NetbirdFwmark)
-	})
-	if err != nil {
-		return fmt.Errorf("control: %w", err)
-	}
-
-	if setErr != nil {
-		return fmt.Errorf("set SO_MARK: %w", setErr)
-	}
-
-	return nil
-}

util/net/net_linux.go

@@ -0,0 +1,35 @@
+//go:build !android
+
+package net
+
+import (
+	"fmt"
+	"syscall"
+)
+
+// SetSocketMark sets the SO_MARK option on the given socket connection
+func SetSocketMark(conn syscall.Conn) error {
+	sysconn, err := conn.SyscallConn()
+	if err != nil {
+		return fmt.Errorf("get raw conn: %w", err)
+	}
+
+	return SetRawSocketMark(sysconn)
+}
+
+func SetRawSocketMark(conn syscall.RawConn) error {
+	var setErr error
+
+	err := conn.Control(func(fd uintptr) {
+		setErr = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, NetbirdFwmark)
+	})
+	if err != nil {
+		return fmt.Errorf("control: %w", err)
+	}
+
+	if setErr != nil {
+		return fmt.Errorf("set SO_MARK: %w", setErr)
+	}
+
+	return nil
+}