Merge changes I943d4efb,I02378125,I2ee4ae52
* changes:
Reset the generated v6 clat address when stop
Add helper method to translate v4 address pair to clat v6
Add methods to provide clat source address
diff --git a/service/src/com/android/server/connectivity/Nat464Xlat.java b/service/src/com/android/server/connectivity/Nat464Xlat.java
index 90cddda..b315235 100644
--- a/service/src/com/android/server/connectivity/Nat464Xlat.java
+++ b/service/src/com/android/server/connectivity/Nat464Xlat.java
@@ -44,7 +44,9 @@
import com.android.server.ConnectivityService;
import java.io.IOException;
+import java.net.Inet4Address;
import java.net.Inet6Address;
+import java.net.UnknownHostException;
import java.util.Objects;
/**
@@ -99,7 +101,8 @@
private IpPrefix mNat64PrefixFromRa;
private String mBaseIface;
private String mIface;
- private Inet6Address mIPv6Address;
+ @VisibleForTesting
+ Inet6Address mIPv6Address;
private State mState = State.IDLE;
private final ClatCoordinator mClatCoordinator; // non-null iff T+
@@ -239,6 +242,7 @@
mNat64PrefixInUse = null;
mIface = null;
mBaseIface = null;
+ mIPv6Address = null;
if (!mPrefixDiscoveryRunning) {
setPrefix64(null);
@@ -541,6 +545,52 @@
}
/**
+ * Translate the input v4 address to v6 clat address.
+ */
+ @Nullable
+ public Inet6Address translateV4toV6(@NonNull Inet4Address addr) {
+ // Variables in Nat464Xlat should only be accessed from handler thread.
+ ensureRunningOnHandlerThread();
+ if (!isStarted()) return null;
+
+ return convertv4ToClatv6(mNat64PrefixInUse, addr);
+ }
+
+ @Nullable
+ private static Inet6Address convertv4ToClatv6(
+ @NonNull IpPrefix prefix, @NonNull Inet4Address addr) {
+ final byte[] v6Addr = new byte[16];
+ // Generate a v6 address from Nat64 prefix. Prefix should be 12 bytes long.
+ System.arraycopy(prefix.getAddress().getAddress(), 0, v6Addr, 0, 12);
+ System.arraycopy(addr.getAddress(), 0, v6Addr, 12, 4);
+
+ try {
+ return (Inet6Address) Inet6Address.getByAddress(v6Addr);
+ } catch (UnknownHostException e) {
+ Log.e(TAG, "getByAddress should never throw for a numeric address");
+ return null;
+ }
+ }
+
+ /**
+ * Get the generated v6 address of clat.
+ */
+ @Nullable
+ public Inet6Address getClatv6SrcAddress() {
+ // Variables in Nat464Xlat should only be accessed from handler thread.
+ ensureRunningOnHandlerThread();
+
+ return mIPv6Address;
+ }
+
+ private void ensureRunningOnHandlerThread() {
+ if (mNetwork.handler().getLooper().getThread() != Thread.currentThread()) {
+ throw new IllegalStateException(
+ "Not running on handler thread: " + Thread.currentThread().getName());
+ }
+ }
+
+ /**
* Dump the NAT64 xlat information.
*
* @param pw print writer.
diff --git a/service/src/com/android/server/connectivity/NetworkAgentInfo.java b/service/src/com/android/server/connectivity/NetworkAgentInfo.java
index 85282cb..08c1455 100644
--- a/service/src/com/android/server/connectivity/NetworkAgentInfo.java
+++ b/service/src/com/android/server/connectivity/NetworkAgentInfo.java
@@ -68,6 +68,8 @@
import com.android.server.ConnectivityService;
import java.io.PrintWriter;
+import java.net.Inet4Address;
+import java.net.Inet6Address;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Arrays;
@@ -1033,6 +1035,22 @@
}
/**
+ * Get the generated v6 address of clat.
+ */
+ @Nullable
+ public Inet6Address getClatv6SrcAddress() {
+ return clatd.getClatv6SrcAddress();
+ }
+
+ /**
+ * Translate the input v4 address to v6 clat address.
+ */
+ @Nullable
+ public Inet6Address translateV4toClatV6(@NonNull Inet4Address addr) {
+ return clatd.translateV4toV6(addr);
+ }
+
+ /**
* Get the NetworkMonitorManager in this NetworkAgentInfo.
*
* <p>This will be null before {@link #onNetworkMonitorCreated(INetworkMonitor)} is called.
diff --git a/tests/unit/java/com/android/server/connectivity/Nat464XlatTest.java b/tests/unit/java/com/android/server/connectivity/Nat464XlatTest.java
index 06e0d6d..58c0114 100644
--- a/tests/unit/java/com/android/server/connectivity/Nat464XlatTest.java
+++ b/tests/unit/java/com/android/server/connectivity/Nat464XlatTest.java
@@ -20,10 +20,12 @@
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.any;
import static org.mockito.Mockito.anyInt;
import static org.mockito.Mockito.anyString;
+import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.eq;
import static org.mockito.Mockito.inOrder;
import static org.mockito.Mockito.never;
@@ -72,6 +74,7 @@
static final String STACKED_IFACE = "v4-test0";
static final LinkAddress V6ADDR = new LinkAddress("2001:db8:1::f00/64");
static final LinkAddress ADDR = new LinkAddress("192.0.2.5/29");
+ static final String CLAT_V6 = "64:ff9b::1";
static final String NAT64_PREFIX = "64:ff9b::/96";
static final String OTHER_NAT64_PREFIX = "2001:db8:0:64::/96";
static final int NETID = 42;
@@ -132,6 +135,8 @@
when(mNetd.interfaceGetCfg(eq(STACKED_IFACE))).thenReturn(mConfig);
mConfig.ipv4Addr = ADDR.getAddress().getHostAddress();
mConfig.prefixLength = ADDR.getPrefixLength();
+ doReturn(CLAT_V6).when(mClatCoordinator).clatStart(
+ BASE_IFACE, NETID, new IpPrefix(NAT64_PREFIX));
}
private void assertRequiresClat(boolean expected, NetworkAgentInfo nai) {
@@ -286,7 +291,8 @@
assertFalse(c.getValue().getAllInterfaceNames().contains(STACKED_IFACE));
verify(mDnsResolver).stopPrefix64Discovery(eq(NETID));
assertIdle(nat);
-
+ // Verify the generated v6 is reset when clat is stopped.
+ assertNull(nat.mIPv6Address);
// Stacked interface removed notification arrives and is ignored.
nat.interfaceRemoved(STACKED_IFACE);
mLooper.dispatchNext();