ProxyArpManager: Factor out common logic for handling ARP and NDP packets.

Change-Id: I0709f9cda2506f01dbc912b8c3e12443ec217fed

@@ -82,7 +82,7 @@ public class ProxyArp {
 
         packetService.addProcessor(processor, PacketProcessor.director(1));
         readComponentConfiguration(context);
-        requestPackests();
+        requestPackets();
 
         log.info("Started with Application ID {}", appId.id());
     }
@@ -99,13 +99,13 @@ public class ProxyArp {
     @Modified
     public void modified(ComponentContext context) {
         readComponentConfiguration(context);
-        requestPackests();
+        requestPackets();
     }
 
     /**
      * Request packet in via PacketService.
      */
-    private void requestPackests() {
+    private void requestPackets() {
         TrafficSelector.Builder selectorBuilder =
                 DefaultTrafficSelector.builder();
         selectorBuilder.matchEthType(TYPE_ARP);

@@ -21,7 +21,7 @@ import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.packet.PacketContext;
 
 /**
- * Service for processing arp requests on behalf of applications.
+ * Service for processing ARP or NDP requests on behalf of applications.
  */
 // TODO: move to the peer host package
 public interface ProxyArpService {

@@ -33,8 +33,6 @@ import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.Host;
 import org.onosproject.net.flow.DefaultTrafficTreatment;
 import org.onosproject.net.flow.TrafficTreatment;
-import org.onosproject.net.flow.instructions.Instruction;
-import org.onosproject.net.flow.instructions.Instructions;
 import org.onosproject.net.host.HostProvider;
 import org.onosproject.net.host.InterfaceIpAddress;
 import org.onosproject.net.packet.DefaultOutboundPacket;
@@ -43,9 +41,7 @@ import org.onosproject.net.packet.PacketService;
 import org.onosproject.net.provider.ProviderId;
 
 import java.nio.ByteBuffer;
-import java.util.ArrayList;
 import java.util.Collections;
-import java.util.List;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
@@ -149,7 +145,7 @@ public class HostMonitor implements TimerTask {
             Set<Host> hosts = hostManager.getHostsByIp(ip);
 
             if (hosts.isEmpty()) {
-                sendArpNdpRequest(ip);
+                sendRequest(ip);
             } else {
                 for (Host host : hosts) {
                     HostProvider provider = hostProviders.get(host.providerId());
@@ -166,12 +162,11 @@ public class HostMonitor implements TimerTask {
     }
 
     /**
-     * Sends an ARP or Neighbor Discovery Protocol request for the given IP
-     * address.
+     * Sends an ARP or NDP request for the given IP address.
      *
      * @param targetIp IP address to send the request for
      */
-    private void sendArpNdpRequest(IpAddress targetIp) {
+    private void sendRequest(IpAddress targetIp) {
         Interface intf = interfaceService.getMatchingInterface(targetIp);
 
         if (intf == null) {
@@ -180,13 +175,13 @@ public class HostMonitor implements TimerTask {
 
         for (InterfaceIpAddress ia : intf.ipAddresses()) {
             if (ia.subnetAddress().contains(targetIp)) {
-                sendArpNdpProbe(intf.connectPoint(), targetIp, ia.ipAddress(),
+                sendProbe(intf.connectPoint(), targetIp, ia.ipAddress(),
                         intf.mac(), intf.vlan());
             }
         }
     }
 
-    private void sendArpNdpProbe(ConnectPoint connectPoint,
+    private void sendProbe(ConnectPoint connectPoint,
                            IpAddress targetIp,
                            IpAddress sourceIp, MacAddress sourceMac,
                            VlanId vlan) {
@@ -194,17 +189,12 @@ public class HostMonitor implements TimerTask {
 
         if (targetIp.isIp4()) {
             // IPv4: Use ARP
-            probePacket = buildArpRequest(targetIp, sourceIp, sourceMac,
-                                          vlan);
+            probePacket = buildArpRequest(targetIp, sourceIp, sourceMac, vlan);
         } else {
             // IPv6: Use Neighbor Discovery
-            probePacket = buildNdpRequest(targetIp, sourceIp, sourceMac,
-                                          vlan);
+            probePacket = buildNdpRequest(targetIp, sourceIp, sourceMac, vlan);
         }
 
-        List<Instruction> instructions = new ArrayList<>();
-        instructions.add(Instructions.createOutput(connectPoint.port()));
-
         TrafficTreatment treatment = DefaultTrafficTreatment.builder()
             .setOutput(connectPoint.port())
             .build();
@@ -273,7 +263,7 @@ public class HostMonitor implements TimerTask {
         icmp6.setIcmpType(ICMP6.NEIGHBOR_SOLICITATION);
         icmp6.setIcmpCode((byte) 0);
 
-        // Create the Neighbor Solication packet
+        // Create the Neighbor Solicitation packet
         NeighborSolicitation ns = new NeighborSolicitation();
         ns.setTargetAddress(targetIp.toOctets());
         ns.addOption(NeighborDiscoveryOptions.TYPE_SOURCE_LL_ADDRESS,