Send broadcast when changing restrict background.

When changing global restrict background status, send connectivity
change broadcast, since it radically changes DISCONNECTED/BLOCKED
status system-wide.

Also reduce verbose stats logging.

Bug: 5854466
Change-Id: I3b612c520f50cc3000a3a569b7e0ab5f691cc2bd

core/java/android/net/INetworkPolicyListener.aidl

@@ -21,5 +21,6 @@ oneway interface INetworkPolicyListener {
 
     void onUidRulesChanged(int uid, int uidRules);
     void onMeteredIfacesChanged(in String[] meteredIfaces);
+    void onRestrictBackgroundChanged(boolean restrictBackground);
 
 }

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

@@ -1394,9 +1394,7 @@ private NetworkStateTracker makeWimaxStateTracker() {
     private INetworkPolicyListener mPolicyListener = new INetworkPolicyListener.Stub() {
         @Override
         public void onUidRulesChanged(int uid, int uidRules) {
-            // only someone like NPMS should only be calling us
-            mContext.enforceCallingOrSelfPermission(MANAGE_NETWORK_POLICY, TAG);
-
+            // caller is NPMS, since we only register with them
             if (LOGD_RULES) {
                 log("onUidRulesChanged(uid=" + uid + ", uidRules=" + uidRules + ")");
             }
@@ -1415,9 +1413,7 @@ private NetworkStateTracker makeWimaxStateTracker() {
 
         @Override
         public void onMeteredIfacesChanged(String[] meteredIfaces) {
-            // only someone like NPMS should only be calling us
-            mContext.enforceCallingOrSelfPermission(MANAGE_NETWORK_POLICY, TAG);
-
+            // caller is NPMS, since we only register with them
             if (LOGD_RULES) {
                 log("onMeteredIfacesChanged(ifaces=" + Arrays.toString(meteredIfaces) + ")");
             }
@@ -1429,6 +1425,27 @@ private NetworkStateTracker makeWimaxStateTracker() {
                 }
             }
         }
+
+        @Override
+        public void onRestrictBackgroundChanged(boolean restrictBackground) {
+            // caller is NPMS, since we only register with them
+            if (LOGD_RULES) {
+                log("onRestrictBackgroundChanged(restrictBackground=" + restrictBackground + ")");
+            }
+
+            // kick off connectivity change broadcast for active network, since
+            // global background policy change is radical.
+            final int networkType = mActiveDefaultNetwork;
+            if (isNetworkTypeValid(networkType)) {
+                final NetworkStateTracker tracker = mNetTrackers[networkType];
+                if (tracker != null) {
+                    final NetworkInfo info = tracker.getNetworkInfo();
+                    if (info != null && info.isConnected()) {
+                        sendConnectedBroadcast(info);
+                    }
+                }
+            }
+        }
     };
 
     /**

services/java/com/android/server/net/NetworkPolicyManagerService.java

@@ -195,6 +195,7 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
     private static final int MSG_FOREGROUND_ACTIVITIES_CHANGED = 3;
     private static final int MSG_PROCESS_DIED = 4;
     private static final int MSG_LIMIT_REACHED = 5;
+    private static final int MSG_RESTRICT_BACKGROUND_CHANGED = 6;
 
     private final Context mContext;
     private final IActivityManager mActivityManager;
@@ -1225,6 +1226,9 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
             updateNotificationsLocked();
             writePolicyLocked();
         }
+
+        mHandler.obtainMessage(MSG_RESTRICT_BACKGROUND_CHANGED, restrictBackground ? 1 : 0, 0)
+                .sendToTarget();
     }
 
     @Override
@@ -1573,6 +1577,20 @@ public class NetworkPolicyManagerService extends INetworkPolicyManager.Stub {
                     }
                     return true;
                 }
+                case MSG_RESTRICT_BACKGROUND_CHANGED: {
+                    final boolean restrictBackground = msg.arg1 != 0;
+                    final int length = mListeners.beginBroadcast();
+                    for (int i = 0; i < length; i++) {
+                        final INetworkPolicyListener listener = mListeners.getBroadcastItem(i);
+                        if (listener != null) {
+                            try {
+                                listener.onRestrictBackgroundChanged(restrictBackground);
+                            } catch (RemoteException e) {
+                            }
+                        }
+                    }
+                    mListeners.finishBroadcast();
+                }
                 default: {
                     return false;
                 }

services/java/com/android/server/net/NetworkStatsRecorder.java

@@ -51,6 +51,7 @@ import java.util.Map;
 public class NetworkStatsRecorder {
     private static final String TAG = "NetworkStatsRecorder";
     private static final boolean LOGD = true;
+    private static final boolean LOGV = false;
 
     private final FileRotator mRotator;
     private final NonMonotonicObserver<String> mObserver;
@@ -170,7 +171,7 @@ public class NetworkStatsRecorder {
 
         mLastSnapshot = snapshot;
 
-        if (LOGD && unknownIfaces.size() > 0) {
+        if (LOGV && unknownIfaces.size() > 0) {
             Slog.w(TAG, "unknown interfaces " + unknownIfaces + ", ignoring those stats");
         }
     }