diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IpEcn.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IpEcn.java
new file mode 100644
index 0000000..5ecd251
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/IpEcn.java
@@ -0,0 +1,65 @@
+package org.projectfloodlight.openflow.types;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.projectfloodlight.openflow.exceptions.OFParseError;
+
+public enum IpEcn implements OFValueType<IpEcn> {
+    ECN_00((byte)0),
+    ECN_01((byte)1),
+    ECN_10((byte)2),
+    ECN_11((byte)3),
+    ECN_NO_MASK((byte)0xFF);
+
+    public static final IpEcn NO_MASK = ECN_NO_MASK;
+    public static final IpEcn FULL_MASK = ECN_00;
+
+    static final int LENGTH = 1;
+
+    private final byte ecn;
+
+    private IpEcn(byte ecn) {
+        this.ecn = ecn;
+    }
+
+    public static IpEcn of(byte ecn) {
+        switch (ecn) {
+            case 0:
+                return ECN_00;
+            case 1:
+                return ECN_01;
+            case 2:
+                return ECN_10;
+            case 3:
+                return ECN_11;
+            default:
+                throw new IllegalArgumentException("Illegal IP ECN value: " + ecn);
+        }
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+
+    @Override
+    public String toString() {
+        return (ecn < 3 ? "0" : "") + Integer.toBinaryString(ecn);
+    }
+
+    public void writeByte(ChannelBuffer c) {
+        c.writeByte(this.ecn);
+    }
+
+    public static IpEcn readByte(ChannelBuffer c) throws OFParseError {
+        return IpEcn.of((byte)(c.readUnsignedByte()));
+    }
+
+    @Override
+    public IpEcn applyMask(IpEcn mask) {
+        return IpEcn.of((byte)(this.ecn & mask.ecn));
+    }
+
+    public byte getEcnValue() {
+        return ecn;
+    }
+}