diff --git a/openflow_input/oxm_nicira_reg b/openflow_input/oxm_nicira_reg
new file mode 100644
index 0000000..b328dcf
--- /dev/null
+++ b/openflow_input/oxm_nicira_reg
@@ -0,0 +1,126 @@
+// Copyright 2015, 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 removd
+// 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 t"
+//
+// You may not use this file except in compliance with the EPL or LOXI Exception. Youn
+// 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
+#version 5
+
+// Nicira extension for reg0
+struct of_oxm_reg0 : of_oxm {
+    uint32_t type_len == 0x00010004;
+    uint32_t value;
+};
+
+struct of_oxm_reg0_masked : of_oxm {
+    uint32_t type_len == 0x00010108;
+    uint32_t value;
+    uint32_t value_mask;
+};
+
+// Nicira extension for reg1
+struct of_oxm_reg1 : of_oxm {
+    uint32_t type_len == 0x00010204;
+    uint32_t value;
+};
+
+struct of_oxm_reg1_masked : of_oxm {
+    uint32_t type_len == 0x00010308;
+    uint32_t value;
+    uint32_t value_mask;
+};
+
+// Nicira extension for reg2
+struct of_oxm_reg2 : of_oxm {
+    uint32_t type_len == 0x00010404;
+    uint32_t value;
+};
+
+struct of_oxm_reg2_masked : of_oxm {
+    uint32_t type_len == 0x00010508;
+    uint32_t value;
+    uint32_t value_mask;
+};
+
+// Nicira extension for reg3
+struct of_oxm_reg3 : of_oxm {
+    uint32_t type_len == 0x00010604;
+    uint32_t value;
+};
+
+struct of_oxm_reg3_masked : of_oxm {
+    uint32_t type_len == 0x00010708;
+    uint32_t value;
+    uint32_t value_mask;
+};
+
+// Nicira extension for reg4
+struct of_oxm_reg4 : of_oxm {
+    uint32_t type_len == 0x00010804;
+    uint32_t value;
+};
+
+struct of_oxm_reg4_masked : of_oxm {
+    uint32_t type_len == 0x00010908;
+    uint32_t value;
+    uint32_t value_mask;
+};
+
+// Nicira extension for reg5
+struct of_oxm_reg5 : of_oxm {
+    uint32_t type_len == 0x00010a04;
+    uint32_t value;
+};
+
+struct of_oxm_reg5_masked : of_oxm {
+    uint32_t type_len == 0x00010b08;
+    uint32_t value;
+    uint32_t value_mask;
+};
+
+// Nicira extension for reg6
+struct of_oxm_reg6 : of_oxm {
+    uint32_t type_len == 0x00010c04;
+    uint32_t value;
+};
+
+struct of_oxm_reg6_masked : of_oxm {
+    uint32_t type_len == 0x00010d08;
+    uint32_t value;
+    uint32_t value_mask;
+};
+
+// Nicira extension for reg7
+struct of_oxm_reg7 : of_oxm {
+    uint32_t type_len == 0x00010e04;
+    uint32_t value;
+};
+
+struct of_oxm_reg7_masked : of_oxm {
+    uint32_t type_len == 0x00011008;
+    uint32_t value;
+    uint32_t value_mask;
+};