Handle packets that can't be deserialized properly.

Catch BufferUnderflowExceptions that occur while trying to deserialzed
Ethernet packet, and account for the fact that packets may not have been
deserialized correctly when using InboundPackets.

Addresses ONOS-605.

Change-Id: Ia7191e62a339125c9c4d3fe0cf63f9c33eb74cb5

@@ -27,6 +27,7 @@ import org.apache.felix.scr.annotations.Modified;
 import org.apache.felix.scr.annotations.Property;
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onlab.packet.Ethernet;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
 import org.onosproject.net.Host;
@@ -46,7 +47,6 @@ import org.onosproject.net.packet.PacketContext;
 import org.onosproject.net.packet.PacketProcessor;
 import org.onosproject.net.packet.PacketService;
 import org.onosproject.net.topology.TopologyService;
-import org.onlab.packet.Ethernet;
 import org.osgi.service.component.ComponentContext;
 import org.slf4j.Logger;
 
@@ -129,6 +129,10 @@ public class ReactiveForwarding {
             InboundPacket pkt = context.inPacket();
             Ethernet ethPkt = pkt.parsed();
 
+            if (ethPkt == null) {
+                return;
+            }
+
             // Bail if this is deemed to be a control or IPv6 multicast packet.
             if (isControlPacket(ethPkt) || isIpv6Multicast(ethPkt)) {
                 return;

@@ -15,11 +15,14 @@
  */
 package org.onosproject.ifwd;
 
+import static org.slf4j.LoggerFactory.getLogger;
+
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onlab.packet.Ethernet;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
 import org.onosproject.net.Host;
@@ -39,11 +42,8 @@ import org.onosproject.net.packet.PacketContext;
 import org.onosproject.net.packet.PacketProcessor;
 import org.onosproject.net.packet.PacketService;
 import org.onosproject.net.topology.TopologyService;
-import org.onlab.packet.Ethernet;
 import org.slf4j.Logger;
 
-import static org.slf4j.LoggerFactory.getLogger;
-
 /**
  * WORK-IN-PROGRESS: Sample reactive forwarding application using intent framework.
  */
@@ -100,6 +100,10 @@ public class IntentReactiveForwarding {
             InboundPacket pkt = context.inPacket();
             Ethernet ethPkt = pkt.parsed();
 
+            if (ethPkt == null) {
+                return;
+            }
+
             HostId srcId = HostId.hostId(ethPkt.getSourceMAC());
             HostId dstId = HostId.hostId(ethPkt.getDestinationMAC());
 

@@ -31,6 +31,12 @@ import org.apache.felix.scr.annotations.Deactivate;
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.apache.felix.scr.annotations.Service;
+import org.onlab.packet.ARP;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.Ip4Address;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.MacAddress;
+import org.onlab.packet.VlanId;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
 import org.onosproject.net.ConnectPoint;
@@ -61,12 +67,6 @@ import org.onosproject.net.packet.InboundPacket;
 import org.onosproject.net.packet.PacketContext;
 import org.onosproject.net.packet.PacketService;
 import org.onosproject.net.proxyarp.ProxyArpService;
-import org.onlab.packet.ARP;
-import org.onlab.packet.Ethernet;
-import org.onlab.packet.Ip4Address;
-import org.onlab.packet.IpAddress;
-import org.onlab.packet.MacAddress;
-import org.onlab.packet.VlanId;
 import org.slf4j.Logger;
 
 import com.google.common.collect.HashMultimap;
@@ -309,7 +309,7 @@ public class ProxyArpManager implements ProxyArpService {
     public boolean handleArp(PacketContext context) {
         InboundPacket pkt = context.inPacket();
         Ethernet ethPkt = pkt.parsed();
-        if (ethPkt.getEtherType() == Ethernet.TYPE_ARP) {
+        if (ethPkt != null && ethPkt.getEtherType() == Ethernet.TYPE_ARP) {
             ARP arp = (ARP) ethPkt.getPayload();
             if (arp.getOpCode() == ARP.OP_REPLY) {
                 forward(ethPkt);

@@ -16,6 +16,7 @@
 package org.onosproject.openflow.controller;
 
 
+import java.nio.BufferUnderflowException;
 import java.util.Collections;
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -85,8 +86,12 @@ public final class DefaultOpenFlowPacketContext implements OpenFlowPacketContext
     @Override
     public Ethernet parsed() {
         Ethernet eth = new Ethernet();
-        eth.deserialize(pktin.getData(), 0, pktin.getTotalLen());
+        try {
+            eth.deserialize(pktin.getData(), 0, pktin.getData().length);
             return eth;
+        } catch (BufferUnderflowException e) {
+            return null;
+        }
     }
 
     @Override

@@ -15,6 +15,11 @@
  */
 package org.onosproject.provider.host.impl;
 
+import static org.slf4j.LoggerFactory.getLogger;
+
+import java.util.Dictionary;
+import java.util.Set;
+
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
@@ -22,6 +27,10 @@ import org.apache.felix.scr.annotations.Modified;
 import org.apache.felix.scr.annotations.Property;
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onlab.packet.ARP;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.IpAddress;
+import org.onlab.packet.VlanId;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.CoreService;
 import org.onosproject.net.ConnectPoint;
@@ -53,18 +62,9 @@ import org.onosproject.net.provider.AbstractProvider;
 import org.onosproject.net.provider.ProviderId;
 import org.onosproject.net.topology.Topology;
 import org.onosproject.net.topology.TopologyService;
-import org.onlab.packet.ARP;
-import org.onlab.packet.Ethernet;
-import org.onlab.packet.IpAddress;
-import org.onlab.packet.VlanId;
 import org.osgi.service.component.ComponentContext;
 import org.slf4j.Logger;
 
-import java.util.Dictionary;
-import java.util.Set;
-
-import static org.slf4j.LoggerFactory.getLogger;
-
 /**
  * Provider which uses an OpenFlow controller to detect network
  * end-station hosts.
@@ -197,6 +197,10 @@ public class HostLocationProvider extends AbstractProvider implements HostProvid
             }
             Ethernet eth = context.inPacket().parsed();
 
+            if (eth == null) {
+                return;
+            }
+
             VlanId vlan = VlanId.vlanId(eth.getVlanID());
             ConnectPoint heardOn = context.inPacket().receivedFrom();
 

@@ -33,6 +33,9 @@ import java.util.concurrent.atomic.AtomicInteger;
 
 import org.jboss.netty.util.Timeout;
 import org.jboss.netty.util.TimerTask;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.ONOSLLDP;
+import org.onlab.util.Timer;
 import org.onosproject.mastership.MastershipService;
 import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.Device;
@@ -47,9 +50,6 @@ import org.onosproject.net.packet.DefaultOutboundPacket;
 import org.onosproject.net.packet.OutboundPacket;
 import org.onosproject.net.packet.PacketContext;
 import org.onosproject.net.packet.PacketService;
-import org.onlab.packet.Ethernet;
-import org.onlab.packet.ONOSLLDP;
-import org.onlab.util.Timer;
 import org.slf4j.Logger;
 
 // TODO: add 'fast discovery' mode: drop LLDPs in destination switch but listen for flow_removed messages
@@ -208,6 +208,10 @@ public class LinkDiscovery implements TimerTask {
      */
     public boolean handleLLDP(PacketContext context) {
         Ethernet eth = context.inPacket().parsed();
+        if (eth == null) {
+            return false;
+        }
+
         ONOSLLDP onoslldp = ONOSLLDP.parseONOSLLDP(eth);
         if (onoslldp != null) {
             final PortNumber dstPort =