diff --git a/src/common/tnc.h b/src/common/tnc.h
new file mode 100644
index 0000000..108acf9
--- /dev/null
+++ b/src/common/tnc.h
@@ -0,0 +1,121 @@
+/*
+ * TNC - Common defines
+ * Copyright (c) 2007-2014, Jouni Malinen <j@w1.fi>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#ifndef TNC_H
+#define TNC_H
+
+typedef unsigned long TNC_UInt32;
+typedef unsigned char *TNC_BufferReference;
+
+typedef TNC_UInt32 TNC_IMVID;
+typedef TNC_UInt32 TNC_IMCID;
+typedef TNC_UInt32 TNC_ConnectionID;
+typedef TNC_UInt32 TNC_ConnectionState;
+typedef TNC_UInt32 TNC_RetryReason;
+typedef TNC_UInt32 TNC_IMV_Action_Recommendation;
+typedef TNC_UInt32 TNC_IMV_Evaluation_Result;
+typedef TNC_UInt32 TNC_MessageType;
+typedef TNC_MessageType *TNC_MessageTypeList;
+typedef TNC_UInt32 TNC_VendorID;
+typedef TNC_UInt32 TNC_Subtype;
+typedef TNC_UInt32 TNC_MessageSubtype;
+typedef TNC_UInt32 TNC_Version;
+typedef TNC_UInt32 TNC_Result;
+typedef TNC_UInt32 TNC_AttributeID;
+
+typedef TNC_Result (*TNC_TNCS_BindFunctionPointer)(
+	TNC_IMVID imvID,
+	char *functionName,
+	void **pOutfunctionPointer);
+typedef TNC_Result (*TNC_TNCS_ReportMessageTypesPointer)(
+	TNC_IMVID imvID,
+	TNC_MessageTypeList supportedTypes,
+	TNC_UInt32 typeCount);
+typedef TNC_Result (*TNC_TNCS_SendMessagePointer)(
+	TNC_IMVID imvID,
+	TNC_ConnectionID connectionID,
+	TNC_BufferReference message,
+	TNC_UInt32 messageLength,
+	TNC_MessageType messageType);
+typedef TNC_Result (*TNC_TNCS_RequestHandshakeRetryPointer)(
+	TNC_IMVID imvID,
+	TNC_ConnectionID connectionID,
+	TNC_RetryReason reason);
+typedef TNC_Result (*TNC_TNCS_ProvideRecommendationPointer)(
+	TNC_IMVID imvID,
+	TNC_ConnectionID connectionID,
+	TNC_IMV_Action_Recommendation recommendation,
+	TNC_IMV_Evaluation_Result evaluation);
+typedef TNC_Result (*TNC_TNCC_BindFunctionPointer)(
+	TNC_IMCID imcID,
+	char *functionName,
+	void **pOutfunctionPointer);
+typedef TNC_Result (*TNC_TNCC_SendMessagePointer)(
+	TNC_IMCID imcID,
+	TNC_ConnectionID connectionID,
+	TNC_BufferReference message,
+	TNC_UInt32 messageLength,
+	TNC_MessageType messageType);
+typedef TNC_Result (*TNC_TNCC_ReportMessageTypesPointer)(
+	TNC_IMCID imcID,
+	TNC_MessageTypeList supportedTypes,
+	TNC_UInt32 typeCount);
+typedef TNC_Result (*TNC_TNCC_RequestHandshakeRetryPointer)(
+	TNC_IMCID imcID,
+	TNC_ConnectionID connectionID,
+	TNC_RetryReason reason);
+
+#define TNC_IFIMV_VERSION_1 1
+#define TNC_IFIMC_VERSION_1 1
+
+#define TNC_RESULT_SUCCESS 0
+#define TNC_RESULT_NOT_INITIALIZED 1
+#define TNC_RESULT_ALREADY_INITIALIZED 2
+#define TNC_RESULT_NO_COMMON_VERSION 3
+#define TNC_RESULT_CANT_RETRY 4
+#define TNC_RESULT_WONT_RETRY 5
+#define TNC_RESULT_INVALID_PARAMETER 6
+#define TNC_RESULT_CANT_RESPOND 7
+#define TNC_RESULT_ILLEGAL_OPERATION 8
+#define TNC_RESULT_OTHER 9
+#define TNC_RESULT_FATAL 10
+
+#define TNC_CONNECTION_STATE_CREATE 0
+#define TNC_CONNECTION_STATE_HANDSHAKE 1
+#define TNC_CONNECTION_STATE_ACCESS_ALLOWED 2
+#define TNC_CONNECTION_STATE_ACCESS_ISOLATED 3
+#define TNC_CONNECTION_STATE_ACCESS_NONE 4
+#define TNC_CONNECTION_STATE_DELETE 5
+
+#define TNC_VENDORID_ANY ((TNC_VendorID) 0xffffff)
+#define TNC_SUBTYPE_ANY ((TNC_Subtype) 0xff)
+
+/* TNCC-TNCS Message Types */
+#define TNC_TNCCS_RECOMMENDATION		0x00000001
+#define TNC_TNCCS_ERROR				0x00000002
+#define TNC_TNCCS_PREFERREDLANGUAGE		0x00000003
+#define TNC_TNCCS_REASONSTRINGS			0x00000004
+
+/* Possible TNC_IMV_Action_Recommendation values: */
+enum IMV_Action_Recommendation {
+	TNC_IMV_ACTION_RECOMMENDATION_ALLOW,
+	TNC_IMV_ACTION_RECOMMENDATION_NO_ACCESS,
+	TNC_IMV_ACTION_RECOMMENDATION_ISOLATE,
+	TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION
+};
+
+/* Possible TNC_IMV_Evaluation_Result values: */
+enum IMV_Evaluation_Result {
+	TNC_IMV_EVALUATION_RESULT_COMPLIANT,
+	TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MINOR,
+	TNC_IMV_EVALUATION_RESULT_NONCOMPLIANT_MAJOR,
+	TNC_IMV_EVALUATION_RESULT_ERROR,
+	TNC_IMV_EVALUATION_RESULT_DONT_KNOW
+};
+
+#endif /* TNC_H */