Support ignoring penalty for bad wifi networks

am: c8e9e1229a

Change-Id: I6666ee45e9a08c02444c6268b2232bbe8aa2adec

core/java/android/provider/Settings.java

@@ -7450,6 +7450,12 @@ public final class Settings {
        public static final String NETWORK_SWITCH_NOTIFICATION_RATE_LIMIT_MILLIS =
               "network_switch_notification_rate_limit_millis";
 
+       /**
+        * Whether to automatically switch away from wifi networks that lose Internet access.
+        * @hide
+        */
+       public static final String NETWORK_AVOID_BAD_WIFI = "network_avoid_bad_wifi";
+
        /**
         * Whether Wifi display is enabled/disabled
         * 0=disabled. 1=enabled.

core/res/res/values/config.xml

@@ -275,6 +275,11 @@
     <string-array translatable="false" name="config_networkNotifySwitches">
     </string-array>
 
+    <!-- Whether the device should automatically switch away from Wi-Fi networks that lose
+         Internet access. Actual device behaviour is controlled by
+         Settings.Global.NETWORK_AVOID_BAD_WIFI. This is the default value of that setting. -->
+    <integer translatable="false" name="config_networkAvoidBadWifi">1</integer>
+
     <!-- List of regexpressions describing the interface (if any) that represent tetherable
          USB interfaces.  If the device doesn't want to support tethering over USB this should
          be empty.  An example would be "usb.*" -->

core/res/res/values/symbols.xml

@@ -1747,6 +1747,7 @@
   <java-symbol type="integer" name="config_networkTransitionTimeout" />
   <java-symbol type="integer" name="config_networkNotifySwitchType" />
   <java-symbol type="array" name="config_networkNotifySwitches" />
+  <java-symbol type="integer" name="config_networkAvoidBadWifi" />
   <java-symbol type="integer" name="config_notificationsBatteryFullARGB" />
   <java-symbol type="integer" name="config_notificationsBatteryLedOff" />
   <java-symbol type="integer" name="config_notificationsBatteryLedOn" />

services/core/java/com/android/server/ConnectivityService.java

@@ -2735,6 +2735,15 @@ public class ConnectivityService extends IConnectivityManager.Stub
                 PROMPT_UNVALIDATED_DELAY_MS);
     }
 
+    @VisibleForTesting
+    public boolean avoidBadWifi() {
+        int defaultAvoidBadWifi =
+            mContext.getResources().getInteger(R.integer.config_networkAvoidBadWifi);
+        int avoid = Settings.Global.getInt(mContext.getContentResolver(),
+            Settings.Global.NETWORK_AVOID_BAD_WIFI, defaultAvoidBadWifi);
+        return avoid == 1;
+    }
+
     private void handlePromptUnvalidated(Network network) {
         if (VDBG) log("handlePromptUnvalidated " + network);
         NetworkAgentInfo nai = getNetworkAgentInfoForNetwork(network);

services/core/java/com/android/server/connectivity/NetworkAgentInfo.java

@@ -115,6 +115,7 @@ import java.util.TreeSet;
 // is satisfying one or more background NetworkRequests it is kept up in the background. If it is
 // not, ConnectivityService disconnects the NetworkAgent's AsyncChannel.
 public class NetworkAgentInfo implements Comparable<NetworkAgentInfo> {
+
     public NetworkInfo networkInfo;
     // This Network object should always be used if possible, so as to encourage reuse of the
     // enclosed socket factory and connection pool.  Avoid creating other Network objects.
@@ -415,13 +416,20 @@ public class NetworkAgentInfo implements Comparable<NetworkAgentInfo> {
         }
 
         int score = currentScore;
-        if (!lastValidated && !pretendValidated) {
+        if (!lastValidated && !pretendValidated && !ignoreWifiUnvalidationPenalty()) {
             score -= UNVALIDATED_SCORE_PENALTY;
         }
         if (score < 0) score = 0;
         return score;
     }
 
+    // Return true on devices configured to ignore score penalty for wifi networks
+    // that become unvalidated (b/31075769).
+    private boolean ignoreWifiUnvalidationPenalty() {
+        boolean isWifi = networkCapabilities.hasTransport(NetworkCapabilities.TRANSPORT_WIFI);
+        return isWifi && !mConnService.avoidBadWifi() && everValidated;
+    }
+
     // Get the current score for this Network.  This may be modified from what the
     // NetworkAgent sent, as it has modifiers applied to it.
     public int getCurrentScore() {