Inform the DNS resolver when it needs to do DNS64 synthesis. am: 7f7171c6a1 (9afb44fa) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/connectivity/Nat464Xlat.java

+17 −0

Original line number	Diff line number	Diff line
		@@ -198,6 +198,9 @@ public class Nat464Xlat extends BaseNetworkObserver {
		if (mPrefixDiscoveryRunning && !isPrefixDiscoveryNeeded()) {
		stopPrefixDiscovery();
		}
		if (!mPrefixDiscoveryRunning) {
		setPrefix64(mNat64PrefixInUse);
		}
		}

		/**
		@@ -221,6 +224,10 @@ public class Nat464Xlat extends BaseNetworkObserver {
		mIface = null;
		mBaseIface = null;

		if (!mPrefixDiscoveryRunning) {
		setPrefix64(null);
		}

		if (isPrefixDiscoveryNeeded()) {
		if (!mPrefixDiscoveryRunning) {
		startPrefixDiscovery();
		@@ -308,6 +315,16 @@ public class Nat464Xlat extends BaseNetworkObserver {
		return requiresClat(mNetwork) && mNat64PrefixFromRa == null;
		}

		private void setPrefix64(IpPrefix prefix) {
		final String prefixString = (prefix != null) ? prefix.toString() : "";
		try {
		mDnsResolver.setPrefix64(getNetId(), prefixString);
		} catch (RemoteException \| ServiceSpecificException e) {
		Slog.e(TAG, "Error setting NAT64 prefix on netId " + getNetId() + " to "
		+ prefix + ": " + e);
		}
		}

		private void maybeHandleNat64PrefixChange() {
		final IpPrefix newPrefix = selectNat64Prefix();
		if (!Objects.equals(mNat64PrefixInUse, newPrefix)) {

tests/net/java/com/android/server/ConnectivityServiceTest.java

+43 −0

Original line number	Diff line number	Diff line
		@@ -6314,6 +6314,7 @@ public class ConnectivityServiceTest {
		int netId = network.getNetId();
		callback.expectAvailableCallbacksUnvalidated(mCellNetworkAgent);
		inOrder.verify(mMockNetd).clatdStart(iface, pref64FromRa.toString());
		inOrder.verify(mMockDnsResolver).setPrefix64(netId, pref64FromRa.toString());
		inOrder.verify(mMockDnsResolver, never()).startPrefix64Discovery(netId);
		callback.assertNoCallback();
		assertEquals(pref64FromRa, mCm.getLinkProperties(network).getNat64Prefix());
		@@ -6323,6 +6324,7 @@ public class ConnectivityServiceTest {
		mCellNetworkAgent.sendLinkProperties(lp);
		expectNat64PrefixChange(callback, mCellNetworkAgent, null);
		inOrder.verify(mMockNetd).clatdStop(iface);
		inOrder.verify(mMockDnsResolver).setPrefix64(netId, "");
		inOrder.verify(mMockDnsResolver).startPrefix64Discovery(netId);

		// If the RA prefix appears while DNS discovery is in progress, discovery is stopped and
		@@ -6332,6 +6334,7 @@ public class ConnectivityServiceTest {
		expectNat64PrefixChange(callback, mCellNetworkAgent, pref64FromRa);
		inOrder.verify(mMockNetd).clatdStart(iface, pref64FromRa.toString());
		inOrder.verify(mMockDnsResolver).stopPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver).setPrefix64(netId, pref64FromRa.toString());

		// Withdraw the RA prefix so we can test the case where an RA prefix appears after DNS
		// discovery has succeeded.
		@@ -6339,6 +6342,7 @@ public class ConnectivityServiceTest {
		mCellNetworkAgent.sendLinkProperties(lp);
		expectNat64PrefixChange(callback, mCellNetworkAgent, null);
		inOrder.verify(mMockNetd).clatdStop(iface);
		inOrder.verify(mMockDnsResolver).setPrefix64(netId, "");
		inOrder.verify(mMockDnsResolver).startPrefix64Discovery(netId);

		mService.mNetdEventCallback.onNat64PrefixEvent(netId, true /* added */,
		@@ -6355,6 +6359,7 @@ public class ConnectivityServiceTest {
		inOrder.verify(mMockNetd, never()).clatdStart(eq(iface), anyString());
		inOrder.verify(mMockDnsResolver, never()).stopPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver, never()).startPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver, never()).setPrefix64(eq(netId), anyString());

		// If the RA is later withdrawn, nothing happens again.
		lp.setNat64Prefix(null);
		@@ -6364,6 +6369,7 @@ public class ConnectivityServiceTest {
		inOrder.verify(mMockNetd, never()).clatdStart(eq(iface), anyString());
		inOrder.verify(mMockDnsResolver, never()).stopPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver, never()).startPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver, never()).setPrefix64(eq(netId), anyString());

		// If the RA prefix changes, clatd is restarted and prefix discovery is stopped.
		lp.setNat64Prefix(pref64FromRa);
		@@ -6377,6 +6383,7 @@ public class ConnectivityServiceTest {
		pref64FromDnsStr, 96);

		inOrder.verify(mMockNetd).clatdStart(iface, pref64FromRa.toString());
		inOrder.verify(mMockDnsResolver).setPrefix64(netId, pref64FromRa.toString());
		inOrder.verify(mMockDnsResolver, never()).startPrefix64Discovery(netId);

		// If the RA prefix changes, clatd is restarted and prefix discovery is not started.
		@@ -6384,7 +6391,9 @@ public class ConnectivityServiceTest {
		mCellNetworkAgent.sendLinkProperties(lp);
		expectNat64PrefixChange(callback, mCellNetworkAgent, newPref64FromRa);
		inOrder.verify(mMockNetd).clatdStop(iface);
		inOrder.verify(mMockDnsResolver).setPrefix64(netId, "");
		inOrder.verify(mMockNetd).clatdStart(iface, newPref64FromRa.toString());
		inOrder.verify(mMockDnsResolver).setPrefix64(netId, newPref64FromRa.toString());
		inOrder.verify(mMockDnsResolver, never()).stopPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver, never()).startPrefix64Discovery(netId);

		@@ -6397,11 +6406,45 @@ public class ConnectivityServiceTest {
		inOrder.verify(mMockNetd, never()).clatdStart(eq(iface), anyString());
		inOrder.verify(mMockDnsResolver, never()).stopPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver, never()).startPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver, never()).setPrefix64(eq(netId), anyString());

		// The transition between no prefix and DNS prefix is tested in testStackedLinkProperties.

		// If the same prefix is learned first by DNS and then by RA, and clat is later stopped,
		// (e.g., because the network disconnects) setPrefix64(netid, "") is never called.
		lp.setNat64Prefix(null);
		mCellNetworkAgent.sendLinkProperties(lp);
		expectNat64PrefixChange(callback, mCellNetworkAgent, null);
		inOrder.verify(mMockNetd).clatdStop(iface);
		inOrder.verify(mMockDnsResolver).setPrefix64(netId, "");
		inOrder.verify(mMockDnsResolver).startPrefix64Discovery(netId);
		mService.mNetdEventCallback.onNat64PrefixEvent(netId, true /* added */,
		pref64FromDnsStr, 96);
		expectNat64PrefixChange(callback, mCellNetworkAgent, pref64FromDns);
		inOrder.verify(mMockNetd).clatdStart(iface, pref64FromDns.toString());
		inOrder.verify(mMockDnsResolver, never()).setPrefix64(eq(netId), any());

		lp.setNat64Prefix(pref64FromDns);
		mCellNetworkAgent.sendLinkProperties(lp);
		callback.assertNoCallback();
		inOrder.verify(mMockNetd, never()).clatdStop(iface);
		inOrder.verify(mMockNetd, never()).clatdStart(eq(iface), anyString());
		inOrder.verify(mMockDnsResolver, never()).stopPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver, never()).startPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver, never()).setPrefix64(eq(netId), anyString());

		// When tearing down a network, clat state is only updated after CALLBACK_LOST is fired, but
		// before CONNECTIVITY_ACTION is sent. Wait for CONNECTIVITY_ACTION before verifying that
		// clat has been stopped, or the test will be flaky.
		ConditionVariable cv = registerConnectivityBroadcast(1);
		mCellNetworkAgent.disconnect();
		callback.expectCallback(CallbackEntry.LOST, mCellNetworkAgent);
		waitFor(cv);

		inOrder.verify(mMockNetd).clatdStop(iface);
		inOrder.verify(mMockDnsResolver).stopPrefix64Discovery(netId);
		inOrder.verify(mMockDnsResolver, never()).setPrefix64(eq(netId), anyString());

		mCm.unregisterNetworkCallback(callback);
		}