diff --git a/openflow_input/bsn_in_ports b/openflow_input/bsn_in_ports
new file mode 100644
index 0000000..05003b9
--- /dev/null
+++ b/openflow_input/bsn_in_ports
@@ -0,0 +1,61 @@
+// Copyright 2013, Big Switch Networks, Inc.
+//
+// LoxiGen is licensed under the Eclipse Public License,
+// version 1.0 (EPL), with the following special exception:
+//
+// LOXI Exception
+//
+// As a special exception to the terms of the EPL, you may
+// distribute libraries generated by LoxiGen (LoxiGen Libraries)
+// under the terms of your choice, provided that copyright and
+// licensing notices generated by LoxiGen are not altered or removed
+// from the LoxiGen Libraries and the notice provided below is (i)
+// included in the LoxiGen Libraries, if distributed in source code
+// form and (ii) included in any documentation for the LoxiGen
+// Libraries, if distributed in binary form.
+//
+// Notice: "Copyright 2013, Big Switch Networks, Inc.
+// This library was generated by the LoxiGen Compiler."
+//
+// You may not use this file except in compliance with the EPL or
+// LOXI Exception. You may obtain a copy of the EPL at:
+//
+// http://www.eclipse.org/legal/epl-v10.html
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an "AS
+// IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+// express or implied. See the EPL for the specific language
+// governing permissions and limitations under the EPL.
+
+#version 3
+#version 4
+
+/*
+ * Bitmap of input ports
+ *
+ * The representation is not straightforward, but it works with existing OXM
+ * semantics.
+ *
+ * The value should always be zero. The mask should be unset in every bit position
+ * where the corresponding input port is allowed, and set in all other bits.
+ * As a special case, the highest bit in the mask is reserved for higher port
+ * numbers than can be represented in the bitmap.
+ *
+ * The value1 and value_mask1 fields contain the most significant bits. value2
+ * and value_mask2 contain the least significant bits.
+ *
+ * Pseudocode for populating value or mask:
+ *   bitmap |= in_port < 128 ? (1 << in_port) : (1 << 127)
+ */
+
+struct of_oxm_bsn_in_ports_128 : of_oxm {
+    uint32_t type_len == 0x00030020;
+    of_bitmap_128_t value;
+};
+
+struct of_oxm_bsn_in_ports_128_masked : of_oxm {
+    uint32_t type_len == 0x00030120;
+    of_bitmap_128_t value;
+    of_bitmap_128_t value_mask;
+};