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diff --git a/src/libcharon/plugins/lookip/lookip_msg.h b/src/libcharon/plugins/lookip/lookip_msg.h
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+++ b/src/libcharon/plugins/lookip/lookip_msg.h
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+/*
+ * Copyright (C) 2012 Martin Willi
+ * Copyright (C) 2012 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup lookip_msg lookip_msg
+ * @{ @ingroup lookip
+ */
+
+#ifndef LOOKIP_MSG_H_
+#define LOOKIP_MSG_H_
+
+#define LOOKIP_SOCKET IPSEC_PIDDIR "/charon.lkp"
+
+typedef struct lookip_request_t lookip_request_t;
+typedef struct lookip_response_t lookip_response_t;
+
+/**
+ * Message type.
+ *
+ * The client can send a batch of request messages, containing DUMP, LOOKUP or
+ * REGISTER_* messages. The server immediately starts sending responses for
+ * these messages, using ENTRY or NOTIFY_* messages.
+ * A client MUST send an END message to complete a batch. The server will
+ * send any remaining responses, but will not accept new requests and closes
+ * the connection when complete.
+ */
+enum {
+	/** request a dump of all entries */
+	LOOKIP_DUMP = 1,
+	/** lookup a specific virtual IP */
+	LOOKIP_LOOKUP,
+	/** reply message for DUMP and LOOKUP */
+	LOOKIP_ENTRY,
+	/** reply message for LOOKUP if no such IP found */
+	LOOKIP_NOT_FOUND,
+	/** register for notifications about new virtual IPs */
+	LOOKIP_REGISTER_UP,
+	/** register for notifications about virtual IPs released */
+	LOOKIP_REGISTER_DOWN,
+	/** notify reply message for REGISTER_UP */
+	LOOKIP_NOTIFY_UP,
+	/** notify reply message for REGISTER_DOWN */
+	LOOKIP_NOTIFY_DOWN,
+	/** end of request batch */
+	LOOKIP_END,
+};
+
+/**
+ * Request message sent from client.
+ *
+ * Valid request message types are DUMP, LOOKUP, REGISTER_UP/DOWN and END.
+ *
+ * The vip field is used only in LOOKUP requests, but ignored otherwise.
+ */
+struct lookip_request_t {
+	/** request message type */
+	int type;
+	/** null terminated string representation of virtual IP */
+	char vip[40];
+};
+
+/**
+ * Response message sent to client.
+ *
+ * Valid response message types are ENTRY, NOT_FOUND and NOTIFY_UP/DOWN.
+ *
+ * All fields are set in all messages, except in NOT_FOUND: Only vip is set.
+ */
+struct lookip_response_t {
+	/** response message type */
+	int type;
+	/** null terminated string representation of virtual IP */
+	char vip[40];
+	/** null terminated string representation of outer IP */
+	char ip[40];
+	/** null terminated peer identity */
+	char id[128];
+	/** null terminated connection name */
+	char name[40];
+	/** unique connection id */
+	unsigned int unique_id;
+};
+
+#endif /** LOOKIP_MSG_H_ @}*/