Clear IP configuration on lost network

Bug: 4391449
Change-Id: I574128083a5612f13fcccaf5ed091eae114b7943

2 files changed, 19 insertions, 1 deletions

diff --git a/wifi/java/android/net/wifi/WifiConfigStore.java b/wifi/java/android/net/wifi/WifiConfigStore.java
index 7f9fc31..d83b968 100644
--- a/wifi/java/android/net/wifi/WifiConfigStore.java
+++ b/wifi/java/android/net/wifi/WifiConfigStore.java
@@ -478,6 +478,21 @@ class WifiConfigStore {
         }
     }
 
+    /**
+     * clear IP configuration for a given network id
+     */
+    static void clearIpConfiguration(int netId) {
+        synchronized (sConfiguredNetworks) {
+            WifiConfiguration config = sConfiguredNetworks.get(netId);
+            if (config != null && config.linkProperties != null) {
+                // Clear everything except proxy
+                ProxyProperties proxy = config.linkProperties.getHttpProxy();
+                config.linkProperties.clear();
+                config.linkProperties.setHttpProxy(proxy);
+            }
+        }
+    }
+
 
     /**
      * Fetch the proxy properties for a given network id
diff --git a/wifi/java/android/net/wifi/WifiStateMachine.java b/wifi/java/android/net/wifi/WifiStateMachine.java
index e03680f..3cbf726 100644
--- a/wifi/java/android/net/wifi/WifiStateMachine.java
+++ b/wifi/java/android/net/wifi/WifiStateMachine.java
@@ -1440,10 +1440,13 @@ public class WifiStateMachine extends StateMachine {
 
         /* Clear network properties */
         mLinkProperties.clear();
+        /* Clear IP settings if the network used DHCP */
+        if (!WifiConfigStore.isUsingStaticIp(mLastNetworkId)) {
+            WifiConfigStore.clearIpConfiguration(mLastNetworkId);
+        }
 
         mLastBssid= null;
         mLastNetworkId = WifiConfiguration.INVALID_NETWORK_ID;
-
     }
 
     void handlePreDhcpSetup() {