fix MTU

src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.github.shadowsocks"
-    android:versionCode="113"
-    android:versionName="2.7.5">
+    android:versionCode="114"
+    android:versionName="2.7.6">
 
   <uses-permission android:name="android.permission.INTERNET"/>
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

src/main/scala/com/github/shadowsocks/ShadowsocksVpnService.scala

@@ -63,7 +63,7 @@ class ShadowsocksVpnService extends VpnService with BaseService {
 
   private lazy val application = getApplication.asInstanceOf[ShadowsocksApplication]
   val TAG = "ShadowsocksVpnService"
-  val VPN_MTU = 1400
+  val VPN_MTU = 1500
   val PRIVATE_VLAN = "26.26.26.%s"
   var conn: ParcelFileDescriptor = null
   var notificationManager: NotificationManager = null
@@ -103,21 +103,13 @@ class ShadowsocksVpnService extends VpnService with BaseService {
     null
   }
 
-  override def onDestroy() {
-    super.onDestroy()
-    if (vpnThread != null) vpnThread.stopThread()
-  }
-
   override def onCreate() {
     super.onCreate()
 
     ConfigUtils.refresh(this)
 
     notificationManager = getSystemService(Context.NOTIFICATION_SERVICE)
       .asInstanceOf[NotificationManager]
-
-    vpnThread = new ShadowsocksVpnThread(this)
-    vpnThread.start()
   }
 
   override def onRevoke() {
@@ -126,6 +118,11 @@ class ShadowsocksVpnService extends VpnService with BaseService {
 
   override def stopRunner() {
 
+    if (vpnThread != null) {
+      vpnThread.stopThread()
+      vpnThread = null
+    }
+
     // channge the state
     changeState(State.STOPPING)
 
@@ -185,6 +182,14 @@ class ShadowsocksVpnService extends VpnService with BaseService {
 
   override def startRunner(c: Config) {
 
+    if (vpnThread != null) {
+      vpnThread.stopThread()
+      vpnThread = null
+    }
+
+    vpnThread = new ShadowsocksVpnThread(this)
+    vpnThread.start()
+
     config = c
 
     // ensure the VPNService is prepared

src/main/scala/com/github/shadowsocks/ShadowsocksVpnThread.scala

@@ -45,43 +45,38 @@ import java.util.concurrent.Executors
 import android.net.{LocalServerSocket, LocalSocket, LocalSocketAddress}
 import android.util.Log
 
+object ShadowsocksVpn {
+  @volatile var serverSocket: LocalServerSocket = null
+}
+
 class ShadowsocksVpnThread(vpnService: ShadowsocksVpnService) extends Thread {
 
   val TAG = "ShadowsocksVpnService"
   val PATH = "shadowsocks_protect"
 
   var isRunning: Boolean = true
-  var serverSocket: LocalServerSocket = null
 
   def stopThread() {
     isRunning = false
-    if (serverSocket != null) {
-      serverSocket.close()
-      serverSocket = null
-    }
   }
 
   override def run(): Unit = {
 
     try {
-      if (serverSocket != null) {
-        serverSocket.close()
-        serverSocket = null
+      if (ShadowsocksVpn.serverSocket == null) {
+        ShadowsocksVpn.serverSocket = new LocalServerSocket(PATH)
       }
-      serverSocket = new LocalServerSocket(PATH)
     } catch {
       case e: IOException =>
         Log.e(TAG, "unable to bind", e)
-        vpnService.stopBackgroundService()
         return
     }
 
     val pool = Executors.newFixedThreadPool(4)
 
     while (isRunning) {
-
       try {
-        val socket = serverSocket.accept()
+        val socket = ShadowsocksVpn.serverSocket.accept()
 
         pool.execute(new Runnable {
           override def run() {
@@ -126,7 +121,10 @@ class ShadowsocksVpnThread(vpnService: ShadowsocksVpnService) extends Thread {
 
         }})
       } catch {
-        case e: IOException => Log.e(TAG, "Error when accept socket", e)
+        case e: IOException => {
+          Log.e(TAG, "Error when accept socket", e)
+          return
+        }
       }
     }
   }