Add support to change IPv6 privacy extensions

Bug: 3360737
Change-Id: I9136992d05f7abf15bdfd92aad3a3e0c0fe3bee2

Author: isheriff

core/java/android/os/INetworkManagementService.aidl

@@ -73,6 +73,11 @@ interface INetworkManagementService
      */
     void setInterfaceUp(String iface);
 
+    /**
+     * Set interface IPv6 privacy extensions
+     */
+    void setInterfaceIpv6PrivacyExtensions(String iface, boolean enable);
+
     /**
      * Retrieves the network routes currently configured on the specified
      * interface

services/java/com/android/server/NetworkManagementService.java

@@ -480,6 +480,20 @@ public void setInterfaceUp(String iface) throws IllegalStateException {
         }
     }
 
+    public void setInterfaceIpv6PrivacyExtensions(String iface, boolean enable)
+            throws IllegalStateException {
+        String cmd = String.format("interface ipv6privacyextensions %s %s", iface,
+                enable ? "enable" : "disable");
+        try {
+            mConnector.doCommand(cmd);
+        } catch (NativeDaemonConnectorException e) {
+            throw new IllegalStateException(
+                    "Unable to communicate with native daemon to set ipv6privacyextensions - " + e);
+        }
+    }
+
+
+
     /* TODO: This is right now a IPv4 only function. Works for wifi which loses its
        IPv6 addresses on interface down, but we need to do full clean up here */
     public void clearInterfaceAddresses(String iface) throws IllegalStateException {

wifi/java/android/net/wifi/WifiStateMachine.java

@@ -1917,15 +1917,17 @@ public boolean processMessage(Message message) {
                         Log.e(TAG, "Failed to reload STA firmware " + e);
                         // continue
                     }
-                    //A runtime crash can leave the interface up and
-                    //this affects connectivity when supplicant starts up.
-                    //Ensure interface is down before a supplicant start.
-                    try {
+                   try {
+                       //A runtime crash can leave the interface up and
+                       //this affects connectivity when supplicant starts up.
+                       //Ensure interface is down before a supplicant start.
                         mNwService.setInterfaceDown(mInterfaceName);
+                        //Set privacy extensions
+                        mNwService.setInterfaceIpv6PrivacyExtensions(mInterfaceName, true);
                     } catch (RemoteException re) {
-                        if (DBG) Log.w(TAG, "Unable to bring down wlan interface: " + re);
+                        if (DBG) Log.w(TAG, "Unable to change interface settings: " + re);
                     } catch (IllegalStateException ie) {
-                        if (DBG) Log.w(TAG, "Unable to bring down wlan interface: " + ie);
+                        if (DBG) Log.w(TAG, "Unable to change interface settings: " + ie);
                     }
 
                     if(WifiNative.startSupplicant()) {