From 451c39922990bf79389372fda59ac0219cdd131a Mon Sep 17 00:00:00 2001 From: Benedict Wong Date: Tue, 9 Nov 2021 20:16:34 +0000 Subject: Pull underlying network MTU using Java APIs This change ensures that if the VCN's underlying network MTU is not reported via the LinkProperties APIs (as in the case of Carrier WiFi), the kernel values will be used (as possible). Bug: 204813618 Test: Manual testing Test: atest FrameworksVcnTests CtsVcnTestCases Original-Change: https://android-review.googlesource.com/1877796 Change-Id: If291aa6b915e4da39152a679bbe3e40216b42f44 Merged-In: If291aa6b915e4da39152a679bbe3e40216b42f44 --- .../server/vcn/VcnGatewayConnectionTest.java | 70 ++++++++++++++++++++++ 1 file changed, 70 insertions(+) (limited to 'tests') diff --git a/tests/vcn/java/com/android/server/vcn/VcnGatewayConnectionTest.java b/tests/vcn/java/com/android/server/vcn/VcnGatewayConnectionTest.java index a7001713533c..b8eefabea3c6 100644 --- a/tests/vcn/java/com/android/server/vcn/VcnGatewayConnectionTest.java +++ b/tests/vcn/java/com/android/server/vcn/VcnGatewayConnectionTest.java @@ -16,6 +16,7 @@ package com.android.server.vcn; +import static android.net.IpSecManager.IpSecTunnelInterface; import static android.net.NetworkCapabilities.NET_CAPABILITY_DUN; import static android.net.NetworkCapabilities.NET_CAPABILITY_INTERNET; import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_METERED; @@ -24,6 +25,8 @@ import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_VCN_MANAGED; import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR; import static android.net.NetworkCapabilities.TRANSPORT_WIFI; +import static com.android.server.vcn.VcnGatewayConnection.DUMMY_ADDR; +import static com.android.server.vcn.VcnGatewayConnection.VcnChildSessionConfiguration; import static com.android.server.vcn.VcnGatewayConnection.VcnIkeSession; import static com.android.server.vcn.VcnGatewayConnection.VcnNetworkAgent; @@ -36,8 +39,11 @@ import static org.mockito.Matchers.eq; import static org.mockito.Mockito.CALLS_REAL_METHODS; import static org.mockito.Mockito.doReturn; import static org.mockito.Mockito.mock; +import static org.mockito.Mockito.times; import static org.mockito.Mockito.verify; +import android.net.IpSecManager; +import android.net.LinkAddress; import android.net.LinkProperties; import android.net.Network; import android.net.NetworkCapabilities; @@ -59,8 +65,11 @@ import org.junit.Before; import org.junit.Test; import org.junit.runner.RunWith; +import java.net.InetAddress; +import java.util.Arrays; import java.util.Collections; import java.util.HashMap; +import java.util.List; import java.util.Map; import java.util.UUID; @@ -70,6 +79,8 @@ import java.util.UUID; public class VcnGatewayConnectionTest extends VcnGatewayConnectionTestBase { private static final int TEST_UID = Process.myUid() + 1; + private static final String LOOPBACK_IFACE = "lo"; + private static final ParcelUuid TEST_PARCEL_UUID = new ParcelUuid(UUID.randomUUID()); private static final int TEST_SIM_SLOT_INDEX = 1; private static final int TEST_SUBSCRIPTION_ID_1 = 2; @@ -77,6 +88,12 @@ public class VcnGatewayConnectionTest extends VcnGatewayConnectionTestBase { private static final int TEST_SUBSCRIPTION_ID_2 = 3; private static final SubscriptionInfo TEST_SUBINFO_2 = mock(SubscriptionInfo.class); private static final Map TEST_SUBID_TO_GROUP_MAP; + private static final String TEST_TCP_BUFFER_SIZES = "1,2,3,4,5,6"; + private static final int TEST_MTU = 1300; + private static final int TEST_MTU_DELTA = 64; + private static final List TEST_INTERNAL_ADDRESSES = + Arrays.asList(new LinkAddress(DUMMY_ADDR, 16)); + private static final List TEST_DNS_ADDRESSES = Arrays.asList(DUMMY_ADDR); private static final int TEST_UPSTREAM_BANDWIDTH = 1234; private static final int TEST_DOWNSTREAM_BANDWIDTH = 2345; @@ -165,6 +182,59 @@ public class VcnGatewayConnectionTest extends VcnGatewayConnectionTestBase { verifyBuildNetworkCapabilitiesCommon(TRANSPORT_CELLULAR, false /* isMobileDataEnabled */); } + @Test + public void testBuildLinkProperties() throws Exception { + final IpSecTunnelInterface tunnelIface = + mContext.getSystemService(IpSecManager.class) + .createIpSecTunnelInterface( + DUMMY_ADDR, DUMMY_ADDR, TEST_UNDERLYING_NETWORK_RECORD_1.network); + + final LinkProperties underlyingLp = new LinkProperties(); + underlyingLp.setInterfaceName(LOOPBACK_IFACE); + underlyingLp.setTcpBufferSizes(TEST_TCP_BUFFER_SIZES); + doReturn(TEST_MTU).when(mDeps).getUnderlyingIfaceMtu(LOOPBACK_IFACE); + + final VcnChildSessionConfiguration childSessionConfig = + mock(VcnChildSessionConfiguration.class); + doReturn(TEST_INTERNAL_ADDRESSES).when(childSessionConfig).getInternalAddresses(); + doReturn(TEST_DNS_ADDRESSES).when(childSessionConfig).getInternalDnsServers(); + + UnderlyingNetworkRecord record = + new UnderlyingNetworkRecord( + mock(Network.class, CALLS_REAL_METHODS), + new NetworkCapabilities.Builder().build(), + underlyingLp, + false); + + final LinkProperties vcnLp1 = + mGatewayConnection.buildConnectedLinkProperties( + VcnGatewayConnectionConfigTest.buildTestConfig(), + tunnelIface, + childSessionConfig, + record); + + verify(mDeps).getUnderlyingIfaceMtu(LOOPBACK_IFACE); + + // Instead of having to recalculate the final MTU (after accounting for IPsec overhead), + // calculate another set of Link Properties with a lower MTU, and calculate the delta. + doReturn(TEST_MTU - TEST_MTU_DELTA).when(mDeps).getUnderlyingIfaceMtu(LOOPBACK_IFACE); + + final LinkProperties vcnLp2 = + mGatewayConnection.buildConnectedLinkProperties( + VcnGatewayConnectionConfigTest.buildTestConfig(), + tunnelIface, + childSessionConfig, + record); + + verify(mDeps, times(2)).getUnderlyingIfaceMtu(LOOPBACK_IFACE); + + assertEquals(tunnelIface.getInterfaceName(), vcnLp1.getInterfaceName()); + assertEquals(TEST_INTERNAL_ADDRESSES, vcnLp1.getLinkAddresses()); + assertEquals(TEST_DNS_ADDRESSES, vcnLp1.getDnsServers()); + assertEquals(TEST_TCP_BUFFER_SIZES, vcnLp1.getTcpBufferSizes()); + assertEquals(TEST_MTU_DELTA, vcnLp1.getMtu() - vcnLp2.getMtu()); + } + @Test public void testSubscriptionSnapshotUpdateNotifiesUnderlyingNetworkTracker() { verifyWakeLockSetUp(); -- cgit v1.2.3-59-g8ed1b