core: MAC address spoofing/cloning (rh #447827) (bgo #553771)

This commit implements MAC cloning feature in NetworkManager. To support that,
'PermHwAddress' property is added into *.Device.Wired and *.Device.Wireless
interfaces. The permanent MAC address is obtained when creating the device, and
is used for 'locking' connections to the device. If a cloned MAC is specified
in connection to be activated, the MAC is set to the interface in stage1. While
disconecting, the permanent MAC is set back to the interface.

src/nm-system.h

@@ -15,7 +15,7 @@
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
- * Copyright (C) 2004 - 2008 Red Hat, Inc.
+ * Copyright (C) 2004 - 2010 Red Hat, Inc.
  * Copyright (C) 2005 - 2008 Novell, Inc.
  */
 
@@ -25,6 +25,8 @@
 #include <netlink/route/rtnl.h>
 #include <netlink/route/route.h>
 
+#include <net/ethernet.h>
+
 #include <glib.h>
 #include "nm-device.h"
 #include "nm-ip4-config.h"
@@ -80,5 +82,6 @@ gboolean        nm_system_device_is_up (NMDevice *device);
 gboolean        nm_system_device_is_up_with_iface (const char *iface);
 
 gboolean		nm_system_device_set_mtu (const char *iface, guint32 mtu);
+gboolean		nm_system_device_set_mac (const char *iface, const struct ether_addr *mac);
 
 #endif