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diff --git a/src/lib/dhcpsrv/utils.h b/src/lib/dhcpsrv/utils.h
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+++ b/src/lib/dhcpsrv/utils.h
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+// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef DHCPSRV_UTILS_H
+#define DHCPSRV_UTILS_H
+
+#include <exceptions/exceptions.h>
+
+namespace isc {
+namespace dhcp {
+
+/// An exception that is thrown if a DHCPv6 protocol violation occurs while
+/// processing a message (e.g. a mandatory option is missing)
+class RFCViolation : public isc::Exception {
+public:
+
+/// @brief constructor
+///
+/// @param file name of the file, where exception occurred
+/// @param line line of the file, where exception occurred
+/// @param what text description of the issue that caused exception
+RFCViolation(const char* file, size_t line, const char* what) :
+    isc::Exception(file, line, what) {}
+};
+
+}; // namespace isc::dhcp
+}; // namespace isc
+
+#endif // DHCPSRV_UTILS_H