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diff --git a/src/hooks/dhcp/high_availability/ha_service_states.h b/src/hooks/dhcp/high_availability/ha_service_states.h
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+++ b/src/hooks/dhcp/high_availability/ha_service_states.h
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+// Copyright (C) 2018-2021 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 HA_SERVICE_STATES_H
+#define HA_SERVICE_STATES_H
+
+#include <util/state_model.h>
+#include <string>
+
+namespace isc {
+namespace ha {
+
+/// Backup state.
+const int HA_BACKUP_ST = util::StateModel::SM_DERIVED_STATE_MIN + 1;
+
+/// Communication recovery state.
+const int HA_COMMUNICATION_RECOVERY_ST = util::StateModel::SM_DERIVED_STATE_MIN + 2;
+
+/// Hot standby state.
+const int HA_HOT_STANDBY_ST = util::StateModel::SM_DERIVED_STATE_MIN + 3;
+
+/// Load balancing state.
+const int HA_LOAD_BALANCING_ST = util::StateModel::SM_DERIVED_STATE_MIN + 4;
+
+/// In maintenance state.
+const int HA_IN_MAINTENANCE_ST = util::StateModel::SM_DERIVED_STATE_MIN + 5;
+
+/// Partner down state.
+const int HA_PARTNER_DOWN_ST = util::StateModel::SM_DERIVED_STATE_MIN + 6;
+
+/// Partner in-maintenance state.
+const int HA_PARTNER_IN_MAINTENANCE_ST = util::StateModel::SM_DERIVED_STATE_MIN + 7;
+
+/// In passive-backup state with a single active server and backup servers.
+const int HA_PASSIVE_BACKUP_ST = util::StateModel::SM_DERIVED_STATE_MIN + 8;
+
+/// Server ready state, i.e. synchronized database, can enable DHCP service.
+const int HA_READY_ST = util::StateModel::SM_DERIVED_STATE_MIN + 9;
+
+/// Synchronizing database state.
+const int HA_SYNCING_ST = util::StateModel::SM_DERIVED_STATE_MIN + 10;
+
+/// HA service terminated state.
+const int HA_TERMINATED_ST = util::StateModel::SM_DERIVED_STATE_MIN + 11;
+
+/// Server waiting state, i.e. waiting for another server to be ready.
+const int HA_WAITING_ST = util::StateModel::SM_DERIVED_STATE_MIN + 12;
+
+/// Special state indicating that this server is unable to communicate with
+/// the partner.
+const int HA_UNAVAILABLE_ST = util::StateModel::SM_DERIVED_STATE_MIN + 1000;
+
+/// @brief Returns state name.
+///
+/// @param state state identifier for which name should be returned.
+///
+/// @throw BadValue if the state identifier is unsupported.
+std::string stateToString(int state);
+
+/// @brief Returns state for a given name.
+///
+/// @param state_name name of the state to be returned.
+///
+/// @throw BadValue if the state name is unsupported.
+int stringToState(const std::string& state_name);
+
+} // end of namespace isc::ha
+} // end of namespace isc
+
+#endif