Remove UdpEncapsulationSocket references in VPNs

This changes the IkeSessionParams generation to set a specific Network,
and no longer passes a UDP encapsulation socket.

Bug: 149356682
Test: FrameworksNetTests passing.
Change-Id: I69f184762490b1dd3d3261d00c81fd32bbebddfc
Merged-In: I69f184762490b1dd3d3261d00c81fd32bbebddfc
(cherry picked from commit 818dca1aad)

services/core/java/com/android/server/connectivity/Vpn.java

@@ -52,7 +52,6 @@ import android.net.Ikev2VpnProfile;
 import android.net.IpPrefix;
 import android.net.IpSecManager;
 import android.net.IpSecManager.IpSecTunnelInterface;
-import android.net.IpSecManager.UdpEncapsulationSocket;
 import android.net.IpSecTransform;
 import android.net.LinkAddress;
 import android.net.LinkProperties;
@@ -2201,7 +2200,6 @@ public class Vpn {
         /** Signal to ensure shutdown is honored even if a new Network is connected. */
         private boolean mIsRunning = true;
 
-        @Nullable private UdpEncapsulationSocket mEncapSocket;
         @Nullable private IpSecTunnelInterface mTunnelIface;
         @Nullable private IkeSession mSession;
         @Nullable private Network mActiveNetwork;
@@ -2352,12 +2350,8 @@ public class Vpn {
                     resetIkeState();
                     mActiveNetwork = network;
 
-                    // TODO(b/149356682): Update this based on new IKE API
-                    mEncapSocket = mIpSecManager.openUdpEncapsulationSocket();
-
-                    // TODO(b/149356682): Update this based on new IKE API
                     final IkeSessionParams ikeSessionParams =
-                            VpnIkev2Utils.buildIkeSessionParams(mProfile, mEncapSocket);
+                            VpnIkev2Utils.buildIkeSessionParams(mContext, mProfile, network);
                     final ChildSessionParams childSessionParams =
                             VpnIkev2Utils.buildChildSessionParams();
 
@@ -2370,11 +2364,6 @@ public class Vpn {
                                     network);
                     mNetd.setInterfaceUp(mTunnelIface.getInterfaceName());
 
-                    // Socket must be bound to prevent network switches from causing
-                    // the IKE teardown to fail/timeout.
-                    // TODO(b/149356682): Update this based on new IKE API
-                    network.bindSocket(mEncapSocket.getFileDescriptor());
-
                     mSession = mIkev2SessionCreator.createIkeSession(
                             mContext,
                             ikeSessionParams,
@@ -2459,16 +2448,6 @@ public class Vpn {
                 mSession.kill(); // Kill here to make sure all resources are released immediately
                 mSession = null;
             }
-
-            // TODO(b/149356682): Update this based on new IKE API
-            if (mEncapSocket != null) {
-                try {
-                    mEncapSocket.close();
-                } catch (IOException e) {
-                    Log.e(TAG, "Failed to close encap socket", e);
-                }
-                mEncapSocket = null;
-            }
         }
 
         /**

services/core/java/com/android/server/connectivity/VpnIkev2Utils.java

@@ -35,10 +35,10 @@ import static android.net.ipsec.ike.SaProposal.PSEUDORANDOM_FUNCTION_AES128_XCBC
 import static android.net.ipsec.ike.SaProposal.PSEUDORANDOM_FUNCTION_HMAC_SHA1;
 
 import android.annotation.NonNull;
+import android.content.Context;
 import android.net.Ikev2VpnProfile;
 import android.net.InetAddresses;
 import android.net.IpPrefix;
-import android.net.IpSecManager.UdpEncapsulationSocket;
 import android.net.IpSecTransform;
 import android.net.Network;
 import android.net.RouteInfo;
@@ -84,7 +84,7 @@ import java.util.List;
  */
 public class VpnIkev2Utils {
     static IkeSessionParams buildIkeSessionParams(
-            @NonNull Ikev2VpnProfile profile, @NonNull UdpEncapsulationSocket socket) {
+            @NonNull Context context, @NonNull Ikev2VpnProfile profile, @NonNull Network network) {
         // TODO(b/149356682): Update this based on new IKE API. Only numeric addresses supported
         //                    until then. All others throw IAE (caught by caller).
         final InetAddress serverAddr = InetAddresses.parseNumericAddress(profile.getServerAddr());
@@ -93,9 +93,9 @@ public class VpnIkev2Utils {
 
         // TODO(b/149356682): Update this based on new IKE API.
         final IkeSessionParams.Builder ikeOptionsBuilder =
-                new IkeSessionParams.Builder()
+                new IkeSessionParams.Builder(context)
                         .setServerAddress(serverAddr)
-                        .setUdpEncapsulationSocket(socket)
+                        .setNetwork(network)
                         .setLocalIdentification(localId)
                         .setRemoteIdentification(remoteId);
         setIkeAuth(profile, ikeOptionsBuilder);