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diff --git a/include/lttng/notification/channel-internal.h b/include/lttng/notification/channel-internal.h
new file mode 100644
index 000000000..e684a9633
--- /dev/null
+++ b/include/lttng/notification/channel-internal.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This library 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 Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef LTTNG_NOTIFICATION_CHANNEL_INTERNAL_H
+#define LTTNG_NOTIFICATION_CHANNEL_INTERNAL_H
+
+#include <lttng/notification/channel.h>
+#include <common/macros.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+enum lttng_notification_channel_message_type {
+	LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_SUBSCRIBE = 0,
+	LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_UNSUBSCRIBE = 1,
+	LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_COMMAND_REPLY = 2,
+	LTTNG_NOTIFICATION_CHANNEL_MESSAGE_TYPE_NOTIFICATION = 3,
+};
+
+struct lttng_notification_channel_message {
+	/* enum lttng_notification_channel_message_type */
+	int8_t type;
+	/* size of the payload following this field */
+	uint32_t size;
+	char payload[];
+} LTTNG_PACKED;
+
+struct lttng_notification_channel_command_reply {
+	/* enum lttng_notification_channel_status */
+	int8_t status;
+} LTTNG_PACKED;
+
+struct lttng_notification_channel {
+	/* FIXME Add mutex to protect the socket from concurrent uses. */
+	int socket;
+};
+
+#endif /* LTTNG_NOTIFICATION_CHANNEL_INTERNAL_H */