added option to add SEND_FLOW_REM flag into new flowmod messages

src/main/java/net/floodlightcontroller/forwarding/Forwarding.java

@@ -470,6 +470,13 @@ public class Forwarding extends ForwardingBase implements IFloodlightModule {
 		} else {
 			log.info("Default priority not configured. Using {}.", FLOWMOD_DEFAULT_PRIORITY);
 		}
+		tmp = configParameters.get("set-send-flow-rem-flag");
+		if (tmp != null) {
+			FLOWMOD_SET_SEND_FLOW_REM_FLAG = Boolean.parseBoolean(tmp);
+			log.info("Default flags will include SEND_FLOW_REM");
+		} else {
+			log.info("Default flags will be empty");
+		}
 		tmp = configParameters.get("match");
 		if (tmp != null) {
 			tmp = tmp.toLowerCase();

src/main/java/net/floodlightcontroller/routing/ForwardingBase.java

@@ -21,6 +21,7 @@ import java.io.IOException;
 import java.util.EnumSet;
 import java.util.ArrayList;
 import java.util.Comparator;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
@@ -51,6 +52,7 @@ import org.projectfloodlight.openflow.protocol.OFFlowMod;
 import org.projectfloodlight.openflow.protocol.match.Match;
 import org.projectfloodlight.openflow.protocol.match.MatchField;
 import org.projectfloodlight.openflow.protocol.OFFlowModCommand;
+import org.projectfloodlight.openflow.protocol.OFFlowModFlags;
 import org.projectfloodlight.openflow.protocol.OFMessage;
 import org.projectfloodlight.openflow.protocol.OFPacketIn;
 import org.projectfloodlight.openflow.protocol.OFPacketOut;
@@ -84,6 +86,8 @@ public abstract class ForwardingBase implements IOFMessageListener {
 	public static int FLOWMOD_DEFAULT_HARD_TIMEOUT = 0; // infinite
 	public static int FLOWMOD_DEFAULT_PRIORITY = 1; // 0 is the default table-miss flow in OF1.3+, so we need to use 1
 	
+	public static boolean FLOWMOD_SET_SEND_FLOW_REM_FLAG = false;
+	
 	public static boolean FLOWMOD_DEFAULT_MATCH_VLAN = true;
 	public static boolean FLOWMOD_DEFAULT_MATCH_MAC = true;
 	public static boolean FLOWMOD_DEFAULT_MATCH_IP_ADDR = true;
@@ -265,6 +269,12 @@ public abstract class ForwardingBase implements IOFMessageListener {
 			aob.setMaxLen(Integer.MAX_VALUE);
 			actions.add(aob.build());
 			
+			if(FLOWMOD_SET_SEND_FLOW_REM_FLAG) {
+				Set<OFFlowModFlags> flags = new HashSet<>();
+				flags.add(OFFlowModFlags.SEND_FLOW_REM);
+				fmb.setFlags(flags);
+			}
+			
 			// compile
 			fmb.setMatch(mb.build()) // was match w/o modifying input port
 			.setActions(actions)