First pass on multinetwork framework

Starting to switch netd to use NetId.
Adding the Network identifying class

bug:13550136
Change-Id: Ie0db4fb17c9300bfafb63329adfa02339911b33d

core/java/android/net/ConnectivityManager.java

@@ -408,6 +408,11 @@ public class ConnectivityManager {
      */
     public static final int CONNECTIVITY_CHANGE_DELAY_DEFAULT = 3000;
 
+    /**
+     * @hide
+     */
+    public final static int INVALID_NET_ID = 0;
+
     private final IConnectivityManager mService;
 
     private final String mPackageName;

core/java/android/net/Network.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net;
+
+import android.os.Parcelable;
+import android.os.Parcel;
+
+
+/**
+ * Identifies the Network.
+ * @hide
+ */
+public class Network implements Parcelable {
+
+    public final int netId;
+
+    public Network(int netId) {
+        this.netId = netId;
+    }
+
+    public Network(Network that) {
+        this.netId = that.netId;
+    }
+
+    // implement the Parcelable interface
+    public int describeContents() {
+        return 0;
+    }
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeInt(netId);
+    }
+
+    public static final Creator<Network> CREATOR =
+        new Creator<Network>() {
+            public Network createFromParcel(Parcel in) {
+                int netId = in.readInt();
+
+                return new Network(netId);
+            }
+
+            public Network[] newArray(int size) {
+                return new Network[size];
+            }
+    };
+}

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

@@ -65,6 +65,7 @@ import android.net.LinkProperties;
 import android.net.LinkProperties.CompareResult;
 import android.net.LinkQualityInfo;
 import android.net.MobileDataStateTracker;
+import android.net.Network;
 import android.net.NetworkConfig;
 import android.net.NetworkInfo;
 import android.net.NetworkInfo.DetailedState;
@@ -165,6 +166,8 @@ import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.HttpsURLConnection;
 import javax.net.ssl.SSLSession;
 
+import static android.net.ConnectivityManager.INVALID_NET_ID;
+
 /**
  * @hide
  */
@@ -442,6 +445,10 @@ public class ConnectivityService extends IConnectivityManager.Stub {
 
     TelephonyManager mTelephonyManager;
 
+    private final static int MIN_NET_ID = 10; // some reserved marks
+    private final static int MAX_NET_ID = 65535;
+    private int mNextNetId = MIN_NET_ID;
+
     public ConnectivityService(Context context, INetworkManagementService netd,
             INetworkStatsService statsService, INetworkPolicyManager policyManager) {
         // Currently, omitting a NetworkFactory will create one internally
@@ -706,6 +713,12 @@ public class ConnectivityService extends IConnectivityManager.Stub {
         mAppOpsManager = (AppOpsManager) context.getSystemService(Context.APP_OPS_SERVICE);
     }
 
+    private synchronized int nextNetId() {
+        int netId = mNextNetId;
+        if (++mNextNetId > MAX_NET_ID) mNextNetId = MIN_NET_ID;
+        return netId;
+    }
+
     /**
      * Factory that creates {@link NetworkStateTracker} instances using given
      * {@link NetworkConfig}.
@@ -1984,6 +1997,7 @@ public class ConnectivityService extends IConnectivityManager.Stub {
         int prevNetType = info.getType();
 
         mNetTrackers[prevNetType].setTeardownRequested(false);
+        int thisNetId = mNetTrackers[prevNetType].getNetwork().netId;
 
         // Remove idletimer previously setup in {@code handleConnect}
         if (mNetConfigs[prevNetType].isDefault()) {
@@ -2069,6 +2083,13 @@ public class ConnectivityService extends IConnectivityManager.Stub {
             sendConnectedBroadcastDelayed(mNetTrackers[mActiveDefaultNetwork].getNetworkInfo(),
                     getConnectivityChangeDelay());
         }
+        try {
+            mNetd.removeNetwork(thisNetId);
+        } catch (Exception e) {
+            loge("Exception removing network: " + e);
+        } finally {
+            mNetTrackers[prevNetType].setNetId(INVALID_NET_ID);
+        }
     }
 
     private void tryFailover(int prevNetType) {
@@ -2336,17 +2357,23 @@ public class ConnectivityService extends IConnectivityManager.Stub {
         if (mNetConfigs[newNetType].isDefault()) {
             if (mActiveDefaultNetwork != -1 && mActiveDefaultNetwork != newNetType) {
                 if (isNewNetTypePreferredOverCurrentNetType(newNetType)) {
-                    // tear down the other
-                    NetworkStateTracker otherNet =
-                            mNetTrackers[mActiveDefaultNetwork];
-                    if (DBG) {
-                        log("Policy requires " + otherNet.getNetworkInfo().getTypeName() +
-                            " teardown");
-                    }
-                    if (!teardown(otherNet)) {
-                        loge("Network declined teardown request");
-                        teardown(thisNet);
-                        return;
+                   String teardownPolicy = SystemProperties.get("net.teardownPolicy");
+                   if (TextUtils.equals(teardownPolicy, "keep") == false) {
+                        // tear down the other
+                        NetworkStateTracker otherNet =
+                                mNetTrackers[mActiveDefaultNetwork];
+                        if (DBG) {
+                            log("Policy requires " + otherNet.getNetworkInfo().getTypeName() +
+                                " teardown");
+                        }
+                        if (!teardown(otherNet)) {
+                            loge("Network declined teardown request");
+                            teardown(thisNet);
+                            return;
+                        }
+                    } else {
+                        //TODO - remove
+                        loge("network teardown skipped due to net.teardownPolicy setting");
                     }
                 } else {
                        // don't accept this one
@@ -2358,6 +2385,15 @@ public class ConnectivityService extends IConnectivityManager.Stub {
                         return;
                 }
             }
+            int thisNetId = nextNetId();
+            thisNet.setNetId(thisNetId);
+            try {
+                mNetd.createNetwork(thisNetId, thisIface);
+            } catch (Exception e) {
+                loge("Exception creating network :" + e);
+                teardown(thisNet);
+                return;
+            }
             setupDataActivityTracking(newNetType);
             synchronized (ConnectivityService.this) {
                 // have a new default network, release the transition wakelock in a second
@@ -2380,6 +2416,16 @@ public class ConnectivityService extends IConnectivityManager.Stub {
             // Don't do this - if we never sign in stay, grey
             //reportNetworkCondition(mActiveDefaultNetwork, 100);
             updateNetworkSettings(thisNet);
+        } else {
+            int thisNetId = nextNetId();
+            thisNet.setNetId(thisNetId);
+            try {
+                mNetd.createNetwork(thisNetId, thisIface);
+            } catch (Exception e) {
+                loge("Exception creating network :" + e);
+                teardown(thisNet);
+                return;
+            }
         }
         thisNet.setTeardownRequested(false);
         updateMtuSizeSettings(thisNet);