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Rename TetherDownstream6Value to Tether6Value. am: d69a886235 am: 6482088003

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Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1560395

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I4a949d07a8a1e353030c0957462f20ee3a38ab7b
This commit is contained in:
Lorenzo Colitti
2021-01-27 01:36:04 +00:00
committed by Automerger Merge Worker
parent 177975f25b 6482088003
commit 80ede0e4d9
8 changed files with 80 additions and 95 deletions
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15
Tethering/apishim/31/com/android/networkstack/tethering/apishim/api31/BpfCoordinatorShimImpl.java
View File

@@ -32,8 +32,8 @@ import com.android.networkstack.tethering.BpfCoordinator.Ipv6ForwardingRule;
import com.android.networkstack.tethering.BpfMap;
import com.android.networkstack.tethering.Tether4Key;
import com.android.networkstack.tethering.Tether4Value;
import com.android.networkstack.tethering.Tether6Value;
import com.android.networkstack.tethering.TetherDownstream6Key;
import com.android.networkstack.tethering.TetherDownstream6Value;
import com.android.networkstack.tethering.TetherLimitKey;
import com.android.networkstack.tethering.TetherLimitValue;
import com.android.networkstack.tethering.TetherStatsKey;
@@ -56,20 +56,17 @@ public class BpfCoordinatorShimImpl
@NonNull
private final SharedLog mLog;
// BPF map of ingress queueing discipline which pre-processes the packets by the IPv4
// downstream rules.
// BPF map for downstream IPv4 forwarding.
@Nullable
private final BpfMap<Tether4Key, Tether4Value> mBpfDownstream4Map;
// BPF map of ingress queueing discipline which pre-processes the packets by the IPv4
// upstream rules.
// BPF map for downstream IPv4 forwarding.
@Nullable
private final BpfMap<Tether4Key, Tether4Value> mBpfUpstream4Map;
// BPF map of ingress queueing discipline which pre-processes the packets by the IPv6
// forwarding rules.
// BPF map for downstream IPv6 forwarding.
@Nullable
private final BpfMap<TetherDownstream6Key, TetherDownstream6Value> mBpfDownstream6Map;
private final BpfMap<TetherDownstream6Key, Tether6Value> mBpfDownstream6Map;
// BPF map of tethering statistics of the upstream interface since tethering startup.
@Nullable
@@ -99,7 +96,7 @@ public class BpfCoordinatorShimImpl
if (!isInitialized()) return false;
final TetherDownstream6Key key = rule.makeTetherDownstream6Key();
final TetherDownstream6Value value = rule.makeTetherDownstream6Value();
final Tether6Value value = rule.makeTether6Value();
try {
mBpfDownstream6Map.updateEntry(key, value);

40
Tethering/src/com/android/networkstack/tethering/BpfCoordinator.java
View File

@@ -83,20 +83,28 @@ import java.util.Set;
* @hide
*/
public class BpfCoordinator {
static final boolean DOWNSTREAM = true;
static final boolean UPSTREAM = false;
private static final String TAG = BpfCoordinator.class.getSimpleName();
private static final int DUMP_TIMEOUT_MS = 10_000;
private static final MacAddress NULL_MAC_ADDRESS = MacAddress.fromString(
"00:00:00:00:00:00");
private static final String TETHER_DOWNSTREAM4_MAP_PATH =
"/sys/fs/bpf/tethering/map_offload_tether_downstream4_map";
private static final String TETHER_UPSTREAM4_MAP_PATH =
"/sys/fs/bpf/tethering/map_offload_tether_upstream4_map";
private static final String TETHER_DOWNSTREAM6_FS_PATH =
"/sys/fs/bpf/tethering/map_offload_tether_downstream6_map";
private static final String TETHER_STATS_MAP_PATH =
"/sys/fs/bpf/tethering/map_offload_tether_stats_map";
private static final String TETHER_LIMIT_MAP_PATH =
"/sys/fs/bpf/tethering/map_offload_tether_limit_map";
private static final String TETHER_DOWNSTREAM4_MAP_PATH = makeMapPath(DOWNSTREAM, 4);
private static final String TETHER_UPSTREAM4_MAP_PATH = makeMapPath(UPSTREAM, 4);
private static final String TETHER_DOWNSTREAM6_FS_PATH = makeMapPath(DOWNSTREAM, 6);
private static final String TETHER_UPSTREAM6_FS_PATH = makeMapPath(UPSTREAM, 6);
private static final String TETHER_STATS_MAP_PATH = makeMapPath("stats");
private static final String TETHER_LIMIT_MAP_PATH = makeMapPath("limit");
private static String makeMapPath(String which) {
return "/sys/fs/bpf/tethering/map_offload_tether_" + which + "_map";
}
private static String makeMapPath(boolean downstream, int ipVersion) {
return makeMapPath((downstream ? "downstream" : "upstream") + ipVersion);
}
@VisibleForTesting
enum StatsType {
@@ -256,16 +264,16 @@ public class BpfCoordinator {
BpfMap.BPF_F_RDWR, Tether4Key.class, Tether4Value.class);
} catch (ErrnoException e) {
Log.e(TAG, "Cannot create upstream4 map: " + e);
return null;
}
return null;
}
/** Get downstream6 BPF map. */
@Nullable public BpfMap<TetherDownstream6Key, TetherDownstream6Value>
@Nullable public BpfMap<TetherDownstream6Key, Tether6Value>
getBpfDownstream6Map() {
try {
return new BpfMap<>(TETHER_DOWNSTREAM6_FS_PATH,
BpfMap.BPF_F_RDWR, TetherDownstream6Key.class, TetherDownstream6Value.class);
BpfMap.BPF_F_RDWR, TetherDownstream6Key.class, Tether6Value.class);
} catch (ErrnoException e) {
Log.e(TAG, "Cannot create downstream6 map: " + e);
return null;
@@ -755,11 +763,11 @@ public class BpfCoordinator {
}
/**
* Return a TetherDownstream6Value object built from the rule.
* Return a Tether6Value object built from the rule.
*/
@NonNull
public TetherDownstream6Value makeTetherDownstream6Value() {
return new TetherDownstream6Value(downstreamIfindex, dstMac, srcMac, ETH_P_IPV6,
public Tether6Value makeTether6Value() {
return new Tether6Value(downstreamIfindex, dstMac, srcMac, ETH_P_IPV6,
NetworkStackConstants.ETHER_MTU);
}

2
Tethering/src/com/android/networkstack/tethering/Tether4Key.java
View File

@@ -28,7 +28,7 @@ import java.net.Inet4Address;
import java.net.UnknownHostException;
import java.util.Objects;
/** The key of BpfMap which is used for IPv4 bpf offload. */
/** Key type for upstream IPv4 forwarding map. */
public class Tether4Key extends Struct {
@Field(order = 0, type = Type.U32)
public final long iif;

2
Tethering/src/com/android/networkstack/tethering/Tether4Value.java
View File

@@ -28,7 +28,7 @@ import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Objects;
/** The value of BpfMap which is used for IPv4 bpf offload. */
/** Value type for upstream IPv4 forwarding map. */
public class Tether4Value extends Struct {
@Field(order = 0, type = Type.U32)
public final long oif;

30
Tethering/src/com/android/networkstack/tethering/TetherDownstream6Value.java → Tethering/src/com/android/networkstack/tethering/Tether6Value.java
View File

@@ -21,15 +21,13 @@ import android.net.MacAddress;
import androidx.annotation.NonNull;
import com.android.net.module.util.Struct;
import com.android.net.module.util.Struct.Field;
import com.android.net.module.util.Struct.Type;
import java.util.Objects;
/** The value of BpfMap which is used for bpf offload. */
public class TetherDownstream6Value extends Struct {
@Field(order = 0, type = Type.U32)
public final long oif; // The output interface index.
/** Value type for downstream and upstream IPv6 forwarding maps. */
public class Tether6Value extends Struct {
@Field(order = 0, type = Type.S32)
public final int oif; // The output interface index.
// The ethhdr struct which is defined in uapi/linux/if_ether.h
@Field(order = 1, type = Type.EUI48)
@@ -42,7 +40,7 @@ public class TetherDownstream6Value extends Struct {
@Field(order = 4, type = Type.U16)
public final int pmtu; // The maximum L3 output path/route mtu.
public TetherDownstream6Value(final long oif, @NonNull final MacAddress ethDstMac,
public Tether6Value(final int oif, @NonNull final MacAddress ethDstMac,
@NonNull final MacAddress ethSrcMac, final int ethProto, final int pmtu) {
Objects.requireNonNull(ethSrcMac);
Objects.requireNonNull(ethDstMac);
@@ -54,24 +52,6 @@ public class TetherDownstream6Value extends Struct {
this.pmtu = pmtu;
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (!(obj instanceof TetherDownstream6Value)) return false;
final TetherDownstream6Value that = (TetherDownstream6Value) obj;
return oif == that.oif && ethDstMac.equals(that.ethDstMac)
&& ethSrcMac.equals(that.ethSrcMac) && ethProto == that.ethProto
&& pmtu == that.pmtu;
}
@Override
public int hashCode() {
return Objects.hash(oif, ethDstMac, ethSrcMac, ethProto, pmtu);
}
@Override
public String toString() {
return String.format("oif: %d, dstMac: %s, srcMac: %s, proto: %d, pmtu: %d", oif,

66
Tethering/tests/privileged/src/com/android/networkstack/tethering/BpfMapTest.java
View File

@@ -54,7 +54,7 @@ public final class BpfMapTest {
private static final String TETHER_DOWNSTREAM6_FS_PATH =
"/sys/fs/bpf/tethering/map_test_tether_downstream6_map";
private ArrayMap<TetherDownstream6Key, TetherDownstream6Value> mTestData;
private ArrayMap<TetherDownstream6Key, Tether6Value> mTestData;
@BeforeClass
public static void setupOnce() {
@@ -71,13 +71,13 @@ public final class BpfMapTest {
mTestData = new ArrayMap<>();
mTestData.put(createTetherDownstream6Key(101, "2001:db8::1"),
createTetherDownstream6Value(11, "00:00:00:00:00:0a", "11:11:11:00:00:0b",
createTether6Value(11, "00:00:00:00:00:0a", "11:11:11:00:00:0b",
ETH_P_IPV6, 1280));
mTestData.put(createTetherDownstream6Key(102, "2001:db8::2"),
createTetherDownstream6Value(22, "00:00:00:00:00:0c", "22:22:22:00:00:0d",
createTether6Value(22, "00:00:00:00:00:0c", "22:22:22:00:00:0d",
ETH_P_IPV6, 1400));
mTestData.put(createTetherDownstream6Key(103, "2001:db8::3"),
createTetherDownstream6Value(33, "00:00:00:00:00:0e", "33:33:33:00:00:0f",
createTether6Value(33, "00:00:00:00:00:0e", "33:33:33:00:00:0f",
ETH_P_IPV6, 1500));
}
@@ -86,14 +86,14 @@ public final class BpfMapTest {
cleanTestMap();
}
private BpfMap<TetherDownstream6Key, TetherDownstream6Value> getTestMap() throws Exception {
private BpfMap<TetherDownstream6Key, Tether6Value> getTestMap() throws Exception {
return new BpfMap<>(
TETHER_DOWNSTREAM6_FS_PATH, BpfMap.BPF_F_RDWR,
TetherDownstream6Key.class, TetherDownstream6Value.class);
TetherDownstream6Key.class, Tether6Value.class);
}
private void cleanTestMap() throws Exception {
try (BpfMap<TetherDownstream6Key, TetherDownstream6Value> bpfMap = getTestMap()) {
try (BpfMap<TetherDownstream6Key, Tether6Value> bpfMap = getTestMap()) {
bpfMap.forEach((key, value) -> {
try {
assertTrue(bpfMap.deleteEntry(key));
@@ -112,18 +112,18 @@ public final class BpfMapTest {
return new TetherDownstream6Key(iif, ipv6Address.getAddress());
}
private TetherDownstream6Value createTetherDownstream6Value(long oif, String src, String dst,
private Tether6Value createTether6Value(int oif, String src, String dst,
int proto, int pmtu) throws Exception {
final MacAddress srcMac = MacAddress.fromString(src);
final MacAddress dstMac = MacAddress.fromString(dst);
return new TetherDownstream6Value(oif, dstMac, srcMac, proto, pmtu);
return new Tether6Value(oif, dstMac, srcMac, proto, pmtu);
}
@Test
public void testGetFd() throws Exception {
try (BpfMap readOnlyMap = new BpfMap<>(TETHER_DOWNSTREAM6_FS_PATH, BpfMap.BPF_F_RDONLY,
TetherDownstream6Key.class, TetherDownstream6Value.class)) {
TetherDownstream6Key.class, Tether6Value.class)) {
assertNotNull(readOnlyMap);
try {
readOnlyMap.insertEntry(mTestData.keyAt(0), mTestData.valueAt(0));
@@ -133,7 +133,7 @@ public final class BpfMapTest {
}
}
try (BpfMap writeOnlyMap = new BpfMap<>(TETHER_DOWNSTREAM6_FS_PATH, BpfMap.BPF_F_WRONLY,
TetherDownstream6Key.class, TetherDownstream6Value.class)) {
TetherDownstream6Key.class, Tether6Value.class)) {
assertNotNull(writeOnlyMap);
try {
writeOnlyMap.getFirstKey();
@@ -143,14 +143,14 @@ public final class BpfMapTest {
}
}
try (BpfMap readWriteMap = new BpfMap<>(TETHER_DOWNSTREAM6_FS_PATH, BpfMap.BPF_F_RDWR,
TetherDownstream6Key.class, TetherDownstream6Value.class)) {
TetherDownstream6Key.class, Tether6Value.class)) {
assertNotNull(readWriteMap);
}
}
@Test
public void testGetFirstKey() throws Exception {
try (BpfMap<TetherDownstream6Key, TetherDownstream6Value> bpfMap = getTestMap()) {
try (BpfMap<TetherDownstream6Key, Tether6Value> bpfMap = getTestMap()) {
// getFirstKey on an empty map returns null.
assertFalse(bpfMap.containsKey(mTestData.keyAt(0)));
assertNull(bpfMap.getFirstKey());
@@ -164,7 +164,7 @@ public final class BpfMapTest {
@Test
public void testGetNextKey() throws Exception {
try (BpfMap<TetherDownstream6Key, TetherDownstream6Value> bpfMap = getTestMap()) {
try (BpfMap<TetherDownstream6Key, Tether6Value> bpfMap = getTestMap()) {
// [1] If the passed-in key is not found on empty map, return null.
final TetherDownstream6Key nonexistentKey =
createTetherDownstream6Key(1234, "2001:db8::10");
@@ -177,7 +177,7 @@ public final class BpfMapTest {
} catch (NullPointerException expected) { }
// The BPF map has one entry now.
final ArrayMap<TetherDownstream6Key, TetherDownstream6Value> resultMap =
final ArrayMap<TetherDownstream6Key, Tether6Value> resultMap =
new ArrayMap<>();
bpfMap.insertEntry(mTestData.keyAt(0), mTestData.valueAt(0));
resultMap.put(mTestData.keyAt(0), mTestData.valueAt(0));
@@ -214,23 +214,23 @@ public final class BpfMapTest {
@Test
public void testUpdateBpfMap() throws Exception {
try (BpfMap<TetherDownstream6Key, TetherDownstream6Value> bpfMap = getTestMap()) {
try (BpfMap<TetherDownstream6Key, Tether6Value> bpfMap = getTestMap()) {
final TetherDownstream6Key key = mTestData.keyAt(0);
final TetherDownstream6Value value = mTestData.valueAt(0);
final TetherDownstream6Value value2 = mTestData.valueAt(1);
final Tether6Value value = mTestData.valueAt(0);
final Tether6Value value2 = mTestData.valueAt(1);
assertFalse(bpfMap.deleteEntry(key));
// updateEntry will create an entry if it does not exist already.
bpfMap.updateEntry(key, value);
assertTrue(bpfMap.containsKey(key));
final TetherDownstream6Value result = bpfMap.getValue(key);
final Tether6Value result = bpfMap.getValue(key);
assertEquals(value, result);
// updateEntry will update an entry that already exists.
bpfMap.updateEntry(key, value2);
assertTrue(bpfMap.containsKey(key));
final TetherDownstream6Value result2 = bpfMap.getValue(key);
final Tether6Value result2 = bpfMap.getValue(key);
assertEquals(value2, result2);
assertTrue(bpfMap.deleteEntry(key));
@@ -240,11 +240,11 @@ public final class BpfMapTest {
@Test
public void testInsertReplaceEntry() throws Exception {
try (BpfMap<TetherDownstream6Key, TetherDownstream6Value> bpfMap = getTestMap()) {
try (BpfMap<TetherDownstream6Key, Tether6Value> bpfMap = getTestMap()) {
final TetherDownstream6Key key = mTestData.keyAt(0);
final TetherDownstream6Value value = mTestData.valueAt(0);
final TetherDownstream6Value value2 = mTestData.valueAt(1);
final Tether6Value value = mTestData.valueAt(0);
final Tether6Value value2 = mTestData.valueAt(1);
try {
bpfMap.replaceEntry(key, value);
@@ -254,7 +254,7 @@ public final class BpfMapTest {
bpfMap.insertEntry(key, value);
assertTrue(bpfMap.containsKey(key));
final TetherDownstream6Value result = bpfMap.getValue(key);
final Tether6Value result = bpfMap.getValue(key);
assertEquals(value, result);
try {
bpfMap.insertEntry(key, value);
@@ -263,15 +263,15 @@ public final class BpfMapTest {
bpfMap.replaceEntry(key, value2);
assertTrue(bpfMap.containsKey(key));
final TetherDownstream6Value result2 = bpfMap.getValue(key);
final Tether6Value result2 = bpfMap.getValue(key);
assertEquals(value2, result2);
}
}
@Test
public void testIterateBpfMap() throws Exception {
try (BpfMap<TetherDownstream6Key, TetherDownstream6Value> bpfMap = getTestMap()) {
final ArrayMap<TetherDownstream6Key, TetherDownstream6Value> resultMap =
try (BpfMap<TetherDownstream6Key, Tether6Value> bpfMap = getTestMap()) {
final ArrayMap<TetherDownstream6Key, Tether6Value> resultMap =
new ArrayMap<>(mTestData);
for (int i = 0; i < resultMap.size(); i++) {
@@ -289,7 +289,7 @@ public final class BpfMapTest {
@Test
public void testIterateEmptyMap() throws Exception {
try (BpfMap<TetherDownstream6Key, TetherDownstream6Value> bpfMap = getTestMap()) {
try (BpfMap<TetherDownstream6Key, Tether6Value> bpfMap = getTestMap()) {
// Can't use an int because variables used in a lambda must be final.
final AtomicInteger count = new AtomicInteger();
bpfMap.forEach((key, value) -> count.incrementAndGet());
@@ -300,8 +300,8 @@ public final class BpfMapTest {
@Test
public void testIterateDeletion() throws Exception {
try (BpfMap<TetherDownstream6Key, TetherDownstream6Value> bpfMap = getTestMap()) {
final ArrayMap<TetherDownstream6Key, TetherDownstream6Value> resultMap =
try (BpfMap<TetherDownstream6Key, Tether6Value> bpfMap = getTestMap()) {
final ArrayMap<TetherDownstream6Key, Tether6Value> resultMap =
new ArrayMap<>(mTestData);
for (int i = 0; i < resultMap.size(); i++) {
@@ -329,14 +329,14 @@ public final class BpfMapTest {
@Test
public void testInsertOverflow() throws Exception {
try (BpfMap<TetherDownstream6Key, TetherDownstream6Value> bpfMap = getTestMap()) {
final ArrayMap<TetherDownstream6Key, TetherDownstream6Value> testData =
try (BpfMap<TetherDownstream6Key, Tether6Value> bpfMap = getTestMap()) {
final ArrayMap<TetherDownstream6Key, Tether6Value> testData =
new ArrayMap<>();
// Build test data for TEST_MAP_SIZE + 1 entries.
for (int i = 1; i <= TEST_MAP_SIZE + 1; i++) {
testData.put(createTetherDownstream6Key(i, "2001:db8::1"),
createTetherDownstream6Value(100, "de:ad:be:ef:00:01", "de:ad:be:ef:00:02",
createTether6Value(100, "de:ad:be:ef:00:01", "de:ad:be:ef:00:02",
ETH_P_IPV6, 1500));
}

10
Tethering/tests/unit/src/android/net/ip/IpServerTest.java
View File

@@ -106,8 +106,8 @@ import com.android.networkstack.tethering.BpfMap;
import com.android.networkstack.tethering.PrivateAddressCoordinator;
import com.android.networkstack.tethering.Tether4Key;
import com.android.networkstack.tethering.Tether4Value;
import com.android.networkstack.tethering.Tether6Value;
import com.android.networkstack.tethering.TetherDownstream6Key;
import com.android.networkstack.tethering.TetherDownstream6Value;
import com.android.networkstack.tethering.TetherLimitKey;
import com.android.networkstack.tethering.TetherLimitValue;
import com.android.networkstack.tethering.TetherStatsKey;
@@ -177,7 +177,7 @@ public class IpServerTest {
@Mock private ConntrackMonitor mConntrackMonitor;
@Mock private BpfMap<Tether4Key, Tether4Value> mBpfDownstream4Map;
@Mock private BpfMap<Tether4Key, Tether4Value> mBpfUpstream4Map;
@Mock private BpfMap<TetherDownstream6Key, TetherDownstream6Value> mBpfDownstream6Map;
@Mock private BpfMap<TetherDownstream6Key, Tether6Value> mBpfDownstream6Map;
@Mock private BpfMap<TetherStatsKey, TetherStatsValue> mBpfStatsMap;
@Mock private BpfMap<TetherLimitKey, TetherLimitValue> mBpfLimitMap;
@@ -319,7 +319,7 @@ public class IpServerTest {
}
@Nullable
public BpfMap<TetherDownstream6Key, TetherDownstream6Value>
public BpfMap<TetherDownstream6Key, Tether6Value>
getBpfDownstream6Map() {
return mBpfDownstream6Map;
}
@@ -800,8 +800,8 @@ public class IpServerTest {
}
@NonNull
private static TetherDownstream6Value makeDownstream6Value(@NonNull final MacAddress dstMac) {
return new TetherDownstream6Value(TEST_IFACE_PARAMS.index, dstMac,
private static Tether6Value makeDownstream6Value(@NonNull final MacAddress dstMac) {
return new Tether6Value(TEST_IFACE_PARAMS.index, dstMac,
TEST_IFACE_PARAMS.macAddr, ETH_P_IPV6, NetworkStackConstants.ETHER_MTU);
}

10
Tethering/tests/unit/src/com/android/networkstack/tethering/BpfCoordinatorTest.java
View File

@@ -160,7 +160,7 @@ public class BpfCoordinatorTest {
@Mock private ConntrackMonitor mConntrackMonitor;
@Mock private BpfMap<Tether4Key, Tether4Value> mBpfDownstream4Map;
@Mock private BpfMap<Tether4Key, Tether4Value> mBpfUpstream4Map;
@Mock private BpfMap<TetherDownstream6Key, TetherDownstream6Value> mBpfDownstream6Map;
@Mock private BpfMap<TetherDownstream6Key, Tether6Value> mBpfDownstream6Map;
// Late init since methods must be called by the thread that created this object.
private TestableNetworkStatsProviderCbBinder mTetherStatsProviderCb;
@@ -217,7 +217,7 @@ public class BpfCoordinatorTest {
}
@Nullable
public BpfMap<TetherDownstream6Key, TetherDownstream6Value>
public BpfMap<TetherDownstream6Key, Tether6Value>
getBpfDownstream6Map() {
return mBpfDownstream6Map;
}
@@ -366,7 +366,7 @@ public class BpfCoordinatorTest {
@NonNull Ipv6ForwardingRule rule) throws Exception {
if (mDeps.isAtLeastS()) {
verifyWithOrder(inOrder, mBpfDownstream6Map).updateEntry(
rule.makeTetherDownstream6Key(), rule.makeTetherDownstream6Value());
rule.makeTetherDownstream6Key(), rule.makeTether6Value());
} else {
verifyWithOrder(inOrder, mNetd).tetherOffloadRuleAdd(matches(rule));
}
@@ -688,11 +688,11 @@ public class BpfCoordinatorTest {
}
@Test
public void testRuleMakeTetherDownstream6Value() throws Exception {
public void testRuleMakeTether6Value() throws Exception {
final Integer mobileIfIndex = 100;
final Ipv6ForwardingRule rule = buildTestForwardingRule(mobileIfIndex, NEIGH_A, MAC_A);
final TetherDownstream6Value value = rule.makeTetherDownstream6Value();
final Tether6Value value = rule.makeTether6Value();
assertEquals(value.oif, DOWNSTREAM_IFINDEX);
assertEquals(value.ethDstMac, MAC_A);
assertEquals(value.ethSrcMac, DOWNSTREAM_MAC);