Add an API to request route to an IPv6 host.

Add API to create a route to an IPv6 host through a particular
interface.

Change-Id: I7649051e94832576e02b5f5ad17abe093d21d48e

5 files changed, 144 insertions, 38 deletions

diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index 280ded6..5b0f60f 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -21,6 +21,9 @@ import android.annotation.SdkConstant.SdkConstantType;
 import android.os.Binder;
 import android.os.RemoteException;
 
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
 /**
  * Class that answers queries about the state of network connectivity. It also
  * notifies applications when network connectivity changes. Get an instance
@@ -309,8 +312,29 @@ public class ConnectivityManager
      * @return {@code true} on success, {@code false} on failure
      */
     public boolean requestRouteToHost(int networkType, int hostAddress) {
+        InetAddress inetAddress = NetworkUtils.intToInetAddress(hostAddress);
+
+        if (inetAddress == null) {
+            return false;
+        }
+
+        return requestRouteToHostAddress(networkType, inetAddress);
+    }
+
+    /**
+     * Ensure that a network route exists to deliver traffic to the specified
+     * host via the specified network interface. An attempt to add a route that
+     * already exists is ignored, but treated as successful.
+     * @param networkType the type of the network over which traffic to the specified
+     * host is to be routed
+     * @param hostAddress the IP address of the host to which the route is desired
+     * @return {@code true} on success, {@code false} on failure
+     * @hide
+     */
+    public boolean requestRouteToHostAddress(int networkType, InetAddress hostAddress) {
+        byte[] address = hostAddress.getAddress();
         try {
-            return mService.requestRouteToHost(networkType, hostAddress);
+            return mService.requestRouteToHostAddress(networkType, address);
         } catch (RemoteException e) {
             return false;
         }
diff --git a/core/java/android/net/IConnectivityManager.aidl b/core/java/android/net/IConnectivityManager.aidl
index b05c2ed..0eb3afd 100644
--- a/core/java/android/net/IConnectivityManager.aidl
+++ b/core/java/android/net/IConnectivityManager.aidl
@@ -47,6 +47,8 @@ interface IConnectivityManager
 
     boolean requestRouteToHost(int networkType, int hostAddress);
 
+    boolean requestRouteToHostAddress(int networkType, in byte[] hostAddress);
+
     boolean getBackgroundDataSetting();
 
     void setBackgroundDataSetting(boolean allowBackgroundData);
diff --git a/core/java/android/net/MobileDataStateTracker.java b/core/java/android/net/MobileDataStateTracker.java
index 214510d..d790fc1 100644
--- a/core/java/android/net/MobileDataStateTracker.java
+++ b/core/java/android/net/MobileDataStateTracker.java
@@ -16,6 +16,8 @@
 
 package android.net;
 
+import java.net.InetAddress;
+
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
@@ -23,7 +25,6 @@ import android.content.IntentFilter;
 import android.os.RemoteException;
 import android.os.Handler;
 import android.os.ServiceManager;
-import android.os.SystemProperties;
 import com.android.internal.telephony.ITelephony;
 import com.android.internal.telephony.Phone;
 import com.android.internal.telephony.TelephonyIntents;
@@ -460,17 +461,16 @@ public class MobileDataStateTracker extends NetworkStateTracker {
      * Ensure that a network route exists to deliver traffic to the specified
      * host via the mobile data network.
      * @param hostAddress the IP address of the host to which the route is desired,
-     * in network byte order.
      * @return {@code true} on success, {@code false} on failure
      */
     @Override
-    public boolean requestRouteToHost(int hostAddress) {
+    public boolean requestRouteToHost(InetAddress hostAddress) {
         if (DBG) {
-            Log.d(TAG, "Requested host route to " + Integer.toHexString(hostAddress) +
+            Log.d(TAG, "Requested host route to " + hostAddress.getHostAddress() +
                     " for " + mApnType + "(" + mInterfaceName + ")");
         }
-        if (mInterfaceName != null && hostAddress != -1) {
-            return NetworkUtils.addHostRoute(mInterfaceName, hostAddress) == 0;
+        if (mInterfaceName != null) {
+            return NetworkUtils.addHostRoute(mInterfaceName, hostAddress, null);
         } else {
             return false;
         }
diff --git a/core/java/android/net/NetworkStateTracker.java b/core/java/android/net/NetworkStateTracker.java
index 1fb0144..5eb36ca 100644
--- a/core/java/android/net/NetworkStateTracker.java
+++ b/core/java/android/net/NetworkStateTracker.java
@@ -18,13 +18,14 @@ package android.net;
 
 import java.io.FileWriter;
 import java.io.IOException;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
 
 import android.os.Handler;
 import android.os.Message;
 import android.os.SystemProperties;
 import android.content.Context;
 import android.text.TextUtils;
-import android.util.Config;
 import android.util.Log;
 
 
@@ -129,13 +130,18 @@ public abstract class NetworkStateTracker extends Handler {
         }
         if (mInterfaceName != null && !mPrivateDnsRouteSet) {
             for (String addrString : getNameServers()) {
-                int addr = NetworkUtils.lookupHost(addrString);
-                if (addr != -1 && addr != 0) {
-                    if (DBG) Log.d(TAG, "  adding "+addrString+" ("+addr+")");
-                    NetworkUtils.addHostRoute(mInterfaceName, addr);
+                if (addrString != null) {
+                    try {
+                        InetAddress inetAddress = InetAddress.getByName(addrString);
+                        if (DBG) Log.d(TAG, "  adding " + addrString);
+                        if (NetworkUtils.addHostRoute(mInterfaceName, inetAddress, null)) {
+                            mPrivateDnsRouteSet = true;
+                        }
+                    } catch (UnknownHostException e) {
+                        if (DBG) Log.d(TAG, " DNS address " + addrString + " : Exception " + e);
+                    }
                 }
             }
-            mPrivateDnsRouteSet = true;
         }
     }
 
@@ -159,8 +165,16 @@ public abstract class NetworkStateTracker extends Handler {
                 Log.d(TAG, "addDefaultRoute for " + mNetworkInfo.getTypeName() +
                         " (" + mInterfaceName + "), GatewayAddr=" + mDefaultGatewayAddr);
             }
-            NetworkUtils.setDefaultRoute(mInterfaceName, mDefaultGatewayAddr);
-            mDefaultRouteSet = true;
+            InetAddress inetAddress = NetworkUtils.intToInetAddress(mDefaultGatewayAddr);
+            if (inetAddress == null) {
+                if (DBG) Log.d(TAG, " Unable to add default route. mDefaultGatewayAddr Error");
+            } else {
+                if (NetworkUtils.addDefaultRoute(mInterfaceName, inetAddress)) {
+                    mDefaultRouteSet = true;
+                } else {
+                    if (DBG) Log.d(TAG, "  Unable to add default route.");
+                }
+            }
         }
     }
 
@@ -398,7 +412,7 @@ public abstract class NetworkStateTracker extends Handler {
      * @param hostAddress the IP address of the host to which the route is desired
      * @return {@code true} on success, {@code false} on failure
      */
-    public boolean requestRouteToHost(int hostAddress) {
+    public boolean requestRouteToHost(InetAddress hostAddress) {
         return false;
     }
 
diff --git a/core/java/android/net/NetworkUtils.java b/core/java/android/net/NetworkUtils.java
index a3ae01b..cb4dc9a 100644
--- a/core/java/android/net/NetworkUtils.java
+++ b/core/java/android/net/NetworkUtils.java
@@ -17,25 +17,39 @@
 package android.net;
 
 import java.net.InetAddress;
+import java.net.Inet4Address;
+import java.net.Inet6Address;
 import java.net.UnknownHostException;
 
+import android.util.Log;
+
 /**
  * Native methods for managing network interfaces.
  *
  * {@hide}
  */
 public class NetworkUtils {
+
+    private static final String TAG = "NetworkUtils";
+
     /** Bring the named network interface up. */
     public native static int enableInterface(String interfaceName);
 
     /** Bring the named network interface down. */
     public native static int disableInterface(String interfaceName);
 
-    /** Add a route to the specified host via the named interface. */
-    public native static int addHostRoute(String interfaceName, int hostaddr);
-
-    /** Add a default route for the named interface. */
-    public native static int setDefaultRoute(String interfaceName, int gwayAddr);
+    /**
+     * Add a route to the routing table.
+     *
+     * @param interfaceName the interface to route through.
+     * @param dst the network or host to route to. May be IPv4 or IPv6, e.g.
+     * "0.0.0.0" or "2001:4860::".
+     * @param prefixLength the prefix length of the route.
+     * @param gw the gateway to use, e.g., "192.168.251.1". If null,
+     * indicates a directly-connected route.
+     */
+    public native static int addRoute(String interfaceName, String dst,
+          int prefixLength, String gw);
 
     /** Return the gateway address for the default route for the named interface. */
     public native static int getDefaultRoute(String interfaceName);
@@ -106,26 +120,78 @@ public class NetworkUtils {
         String interfaceName, int ipAddress, int netmask, int gateway, int dns1, int dns2);
 
     /**
-     * Look up a host name and return the result as an int. Works if the argument
-     * is an IP address in dot notation. Obviously, this can only be used for IPv4
-     * addresses.
-     * @param hostname the name of the host (or the IP address)
-     * @return the IP address as an {@code int} in network byte order
+     * Convert a IPv4 address from an integer to an InetAddress.
+     * @param hostAddr is an Int corresponding to the IPv4 address in network byte order
+     * @return the IP address as an {@code InetAddress}, returns null if
+     * unable to convert or if the int is an invalid address.
      */
-    public static int lookupHost(String hostname) {
+    public static InetAddress intToInetAddress(int hostAddress) {
         InetAddress inetAddress;
+        byte[] addressBytes = { (byte)(0xff & hostAddress),
+                                (byte)(0xff & (hostAddress >> 8)),
+                                (byte)(0xff & (hostAddress >> 16)),
+                                (byte)(0xff & (hostAddress >> 24)) };
+
         try {
-            inetAddress = InetAddress.getByName(hostname);
-        } catch (UnknownHostException e) {
-            return -1;
+           inetAddress = InetAddress.getByAddress(addressBytes);
+        } catch(UnknownHostException e) {
+           return null;
+        }
+
+        return inetAddress;
+    }
+
+    /**
+     * Add a default route through the specified gateway.
+     * @param interfaceName interface on which the route should be added
+     * @param gw the IP address of the gateway to which the route is desired,
+     * @return {@code true} on success, {@code false} on failure
+     */
+    public static boolean addDefaultRoute(String interfaceName, InetAddress gw) {
+        String dstStr;
+        String gwStr = gw.getHostAddress();
+
+        if (gw instanceof Inet4Address) {
+            dstStr = "0.0.0.0";
+        } else if (gw instanceof Inet6Address) {
+            dstStr = "::";
+        } else {
+            Log.w(TAG, "addDefaultRoute failure: address is neither IPv4 nor IPv6" +
+                       "(" + gwStr + ")");
+            return false;
+        }
+        return addRoute(interfaceName, dstStr, 0, gwStr) == 0;
+    }
+
+    /**
+     * Add a host route.
+     * @param interfaceName interface on which the route should be added
+     * @param dst the IP address of the host to which the route is desired,
+     * this should not be null.
+     * @param gw the IP address of the gateway to which the route is desired,
+     * if null, indicates a directly-connected route.
+     * @return {@code true} on success, {@code false} on failure
+     */
+    public static boolean addHostRoute(String interfaceName, InetAddress dst,
+          InetAddress gw) {
+        if (dst == null) {
+            Log.w(TAG, "addHostRoute: dst should not be null");
+            return false;
+        }
+
+        int prefixLength;
+        String dstStr = dst.getHostAddress();
+        String gwStr = (gw != null) ? gw.getHostAddress() : null;
+
+        if (dst instanceof Inet4Address) {
+            prefixLength = 32;
+        } else if (dst instanceof Inet6Address) {
+            prefixLength = 128;
+        } else {
+            Log.w(TAG, "addHostRoute failure: address is neither IPv4 nor IPv6" +
+                       "(" + dst + ")");
+            return false;
         }
-        byte[] addrBytes;
-        int addr;
-        addrBytes = inetAddress.getAddress();
-        addr = ((addrBytes[3] & 0xff) << 24)
-                | ((addrBytes[2] & 0xff) << 16)
-                | ((addrBytes[1] & 0xff) << 8)
-                |  (addrBytes[0] & 0xff);
-        return addr;
+        return addRoute(interfaceName, dstStr, prefixLength, gwStr) == 0;
     }
 }