Refactor the IpPrefix API and implementation:
 * Now IpPrefix uses IpAddress to represent the subnet address
 * The IpPrefix subnet address is masked-out by the prefix length.
   E.g., IpPrefix("1.2.3.4/24") is now stored as IpPrefix("1.2.3.0/24")
 * Removed IpPrefix methods that are not used or don't apply anymore
 * Replaced usage of IpPrefix with IpAddress where appropriate
diff --git a/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowEntryBuilder.java b/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowEntryBuilder.java
index 2ccb9a6..02ec827 100644
--- a/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowEntryBuilder.java
+++ b/providers/openflow/flow/src/main/java/org/onlab/onos/provider/of/flow/impl/FlowEntryBuilder.java
@@ -31,6 +31,7 @@
 import org.onlab.onos.net.flow.TrafficSelector;
 import org.onlab.onos.net.flow.TrafficTreatment;
 import org.onlab.onos.openflow.controller.Dpid;
+import org.onlab.packet.IpAddress;
 import org.onlab.packet.IpPrefix;
 import org.onlab.packet.MacAddress;
 import org.onlab.packet.VlanId;
@@ -167,24 +168,12 @@
             case SET_NW_DST:
                 OFActionSetNwDst nwdst = (OFActionSetNwDst) act;
                 IPv4Address di = nwdst.getNwAddr();
-                if (di.isCidrMask()) {
-                    builder.setIpDst(IpPrefix.valueOf(di.getInt(),
-                            di.asCidrMaskLength()));
-                } else {
-                    builder.setIpDst(IpPrefix.valueOf(di.getInt(),
-                                        IpPrefix.MAX_INET_MASK_LENGTH));
-                }
+                builder.setIpDst(IpAddress.valueOf(di.getInt()));
                 break;
             case SET_NW_SRC:
                 OFActionSetNwSrc nwsrc = (OFActionSetNwSrc) act;
                 IPv4Address si = nwsrc.getNwAddr();
-                if (si.isCidrMask()) {
-                    builder.setIpSrc(IpPrefix.valueOf(si.getInt(),
-                            si.asCidrMaskLength()));
-                } else {
-                    builder.setIpSrc(IpPrefix.valueOf(si.getInt(),
-                                        IpPrefix.MAX_INET_MASK_LENGTH));
-                }
+                builder.setIpSrc(IpAddress.valueOf(si.getInt()));
                 break;
             case EXPERIMENTER:
                 OFActionExperimenter exp = (OFActionExperimenter) act;