Mainline wifi stack module

a) Moved wifi service to a separate APK
b) Use the IWifiStackConnector to load the wifi stack from
SystemServer (similar to network stack).
c) Create a new WifiStackClient interface for system server to interact
with the wifi stack (under new services/wifi folder). Note: This not planned
to be updated via wifi-sdk Apex.
d) Add priv-app permissions for the new wifi stack APK.

Bug: 113174748
Test: Device boots up & connects to wifi networks, hotspot toggle, etc.
Test: Will send for regression tests
Change-Id: I54b3a11ed30668bad5a387370484b2bb0eabca5f
Merged-In: I54b3a11ed30668bad5a387370484b2bb0eabca5f

3 files changed, 112 insertions, 0 deletions

diff --git a/services/wifi/Android.bp b/services/wifi/Android.bp
new file mode 100644
index 000000000000..3c916a6d00cd
--- /dev/null
+++ b/services/wifi/Android.bp
@@ -0,0 +1,11 @@
+// Interfaces between the core system and the wifi mainline module.
+java_library_static {
+    name: "services.wifi",
+    srcs: [
+        "java/**/*.java",
+        "java/**/*.aidl",
+    ],
+    libs: [
+        "services.net",
+    ],
+}
diff --git a/services/wifi/java/android/net/wifi/IWifiStackConnector.aidl b/services/wifi/java/android/net/wifi/IWifiStackConnector.aidl
new file mode 100644
index 000000000000..ad052b9b7928
--- /dev/null
+++ b/services/wifi/java/android/net/wifi/IWifiStackConnector.aidl
@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) 2019, 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 perNmissions and
+ * limitations under the License.
+ */
+package android.net.wifi;
+
+/** @hide */
+oneway interface IWifiStackConnector {
+}
diff --git a/services/wifi/java/android/net/wifi/WifiStackClient.java b/services/wifi/java/android/net/wifi/WifiStackClient.java
new file mode 100644
index 000000000000..067d98ba086c
--- /dev/null
+++ b/services/wifi/java/android/net/wifi/WifiStackClient.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2019 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.wifi;
+
+import static android.os.IServiceManager.DUMP_FLAG_PRIORITY_HIGH;
+import static android.os.IServiceManager.DUMP_FLAG_PRIORITY_NORMAL;
+
+import android.annotation.NonNull;
+import android.content.Context;
+import android.net.ConnectivityModuleConnector;
+import android.os.IBinder;
+import android.os.ServiceManager;
+import android.util.Log;
+
+/**
+ * Service used to communicate with the wifi stack, which could be running in a separate
+ * module.
+ * @hide
+ */
+public class WifiStackClient {
+    public static final String PERMISSION_MAINLINE_WIFI_STACK =
+            "android.permission.MAINLINE_WIFI_STACK";
+
+    private static final String TAG = WifiStackClient.class.getSimpleName();
+    private static WifiStackClient sInstance;
+
+    private WifiStackClient() { }
+
+    /**
+     * Get the WifiStackClient singleton instance.
+     */
+    public static synchronized WifiStackClient getInstance() {
+        if (sInstance == null) {
+            sInstance = new WifiStackClient();
+        }
+        return sInstance;
+    }
+
+    private class WifiStackConnection implements
+            ConnectivityModuleConnector.ModuleServiceCallback {
+        @Override
+        public void onModuleServiceConnected(IBinder service) {
+            Log.i(TAG, "Wifi stack connected");
+            registerWifiStackService(service);
+        }
+    }
+
+    private void registerWifiStackService(@NonNull IBinder service) {
+        ServiceManager.addService(Context.WIFI_STACK_SERVICE, service,
+                false /* allowIsolated */,
+                DUMP_FLAG_PRIORITY_HIGH | DUMP_FLAG_PRIORITY_NORMAL);
+        Log.i(TAG, "Wifi stack service registered");
+    }
+
+    /**
+     * Start the wifi stack. Should be called only once on device startup.
+     *
+     * <p>This method will start the wifi stack either in the wifi stack
+     * process, or inside the system server on devices that do not support the wifi stack
+     * module.
+     */
+    public void start() {
+        Log.i(TAG, "Starting wifi stack");
+        ConnectivityModuleConnector.getInstance().startModuleService(
+                IWifiStackConnector.class.getName(), PERMISSION_MAINLINE_WIFI_STACK,
+                new WifiStackConnection());
+    }
+}