Fixed fetching of ingress port to work with OF1.0 and 1.2+. This is the final...

Fixed fetching of ingress port to work with OF1.0 and 1.2+. This is the final commit for the DHCP server. Will add some unit tests in a later and near-future commit as practice/exercise for me =)

src/main/java/net/floodlightcontroller/dhcpserver/DHCPServer.java

@@ -12,7 +12,9 @@ import org.projectfloodlight.openflow.protocol.OFMessage;
 import org.projectfloodlight.openflow.protocol.OFPacketIn;
 import org.projectfloodlight.openflow.protocol.OFPacketOut;
 import org.projectfloodlight.openflow.protocol.OFType;
+import org.projectfloodlight.openflow.protocol.OFVersion;
 import org.projectfloodlight.openflow.protocol.action.OFAction;
+import org.projectfloodlight.openflow.protocol.match.MatchField;
 import org.projectfloodlight.openflow.types.EthType;
 import org.projectfloodlight.openflow.types.IPv4Address;
 import org.projectfloodlight.openflow.types.IpProtocol;
@@ -838,7 +840,7 @@ public class DHCPServer implements IOFMessageListener, IFloodlightModule  {
 					log.debug("Got DHCP Packet");
 					// This is a DHCP packet that we need to process
 					DHCP DHCPPayload = (DHCP) UDPPayload.getPayload();
-					OFPort inPort = pi.getInPort();
+					OFPort inPort = (pi.getVersion().compareTo(OFVersion.OF_12) < 0 ? pi.getInPort() : pi.getMatch().get(MatchField.IN_PORT));
 
 					/* DHCP/IPv4 Header Information */
 					int xid = 0;