ONOS-1153: Ignore Router Solicitation, Router Advertisement and DAD in HostLocationProvider

Change-Id: I533919fc0b04b87ca54ff0933ca87d38b664e2ef

@@ -37,6 +37,8 @@ import org.onlab.packet.IpAddress;
 import org.onlab.packet.VlanId;
 import org.onlab.packet.ndp.NeighborAdvertisement;
 import org.onlab.packet.ndp.NeighborSolicitation;
+import org.onlab.packet.ndp.RouterAdvertisement;
+import org.onlab.packet.ndp.RouterSolicitation;
 import org.onosproject.cfg.ComponentConfigService;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
@@ -270,27 +272,33 @@ public class HostLocationProvider extends AbstractProvider implements HostProvid
                     new DefaultHostDescription(eth.getSourceMAC(), vlan, hloc);
                 providerService.hostDetected(hid, hdescr);
 
-                //
-                // NeighborAdvertisement and NeighborSolicitation: possible
-                // new hosts, update both location and IP.
-                //
-                // IPv6: update location only
+            //
+            // NeighborAdvertisement and NeighborSolicitation: possible
+            // new hosts, update both location and IP.
+            //
+            // IPv6: update location only
             } else if (eth.getEtherType() == Ethernet.TYPE_IPV6) {
                 IpAddress ip = null;
                 IPv6 ipv6 = (IPv6) eth.getPayload();
 
                 IPacket iPkt = ipv6;
                 while (iPkt != null) {
+                    // Ignore Router Solicitation and Advertisement
+                    if (iPkt instanceof RouterAdvertisement ||
+                        iPkt instanceof RouterSolicitation) {
+                        return;
+                    }
                     if (iPkt instanceof NeighborAdvertisement ||
                         iPkt instanceof NeighborSolicitation) {
                         IpAddress sourceAddress =
                             IpAddress.valueOf(IpAddress.Version.INET6,
                                               ipv6.getSourceAddress());
                         // Ignore DAD packets, in which source address is zero
-                        if (!sourceAddress.isZero()) {
-                            ip = sourceAddress;
-                            break;
+                        if (sourceAddress.isZero()) {
+                            return;
                         }
+                        ip = sourceAddress;
+                        break;
                     }
                     iPkt = iPkt.getPayload();
                 }