Merge "Add toString() to Ipv6ForwardingRule"

Tethering/src/com/android/networkstack/tethering/BpfCoordinator.java

@@ -1473,6 +1473,15 @@ public class BpfCoordinator {
             // to Objects.hash() to avoid autoboxing overhead.
             return Objects.hash(upstreamIfindex, downstreamIfindex, address, srcMac, dstMac);
         }
+
+        @Override
+        public String toString() {
+            return "upstreamIfindex: " + upstreamIfindex
+                    + ", downstreamIfindex: " + downstreamIfindex
+                    + ", address: " + address.getHostAddress()
+                    + ", srcMac: " + srcMac
+                    + ", dstMac: " + dstMac;
+        }
     }
 
     /** Tethering client information class. */

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

@@ -2092,4 +2092,11 @@ public class BpfCoordinatorTest {
         assertNull(mBpfUpstream4Map.getValue(upstream4KeyB));
         assertNull(mBpfDownstream4Map.getValue(downstream4KeyB));
     }
+
+    @Test
+    public void testIpv6ForwardingRuleToString() throws Exception {
+        final Ipv6ForwardingRule rule = buildTestForwardingRule(UPSTREAM_IFINDEX, NEIGH_A, MAC_A);
+        assertEquals("upstreamIfindex: 1001, downstreamIfindex: 1003, address: 2001:db8::1, "
+                + "srcMac: 12:34:56:78:90:ab, dstMac: 00:00:00:00:00:0a", rule.toString());
+    }
 }