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diff --git a/src/babel.h b/src/babel.h
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+/*
+  Copyright (c) 2013, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef _GMRF_PROTO_BABEL_BABEL_H_
+#define _GMRF_PROTO_BABEL_BABEL_H_
+
+#include "types.h"
+
+#define GP_BABEL_PACKET_MAX 1000
+
+#define GP_BABEL_HELLO_INTERVAL 400
+#define GP_BABEL_IHU_INTERVAL (3*GP_BABEL_HELLO_INTERVAL)
+
+#define GP_BABEL_HELLO_TIMEOUT(interval) (16*(interval))
+#define GP_BABEL_IHU_TIMEOUT(interval) ((interval)*7/2)
+
+struct gmrf_context {
+	gp_babel_node_id_t self;
+
+	gp_babel_iface_t *interfaces;
+	gp_babel_neigh_t *neighbours;
+};
+
+struct gp_babel_iface {
+	gp_babel_iface_t *next;
+
+	gmrf_iface_t *gmrf_iface;
+
+	uint16_t seqno;
+
+	gp_babel_neigh_t *neighbours;
+};
+
+struct gp_babel_neigh {
+	gp_babel_neigh_t *next;
+
+	unsigned ref;
+
+	gp_babel_iface_t *iface;
+	gmrf_addr_t addr;
+
+	uint16_t hello_log;
+	uint16_t hello_interval;
+	uint16_t last_seqno;
+	gmrf_time_t last_hello;
+
+	uint16_t ihu_interval;
+	gmrf_time_t last_ihu;
+
+	uint16_t txcost;
+};
+
+static inline gp_babel_iface_t* gp_babel_get_iface(gmrf_context_t *ctx, gmrf_iface_t *gmrf_iface) {
+	gp_babel_iface_t *iface;
+	for (iface = ctx->interfaces; iface; iface = iface->next) {
+		if (iface->gmrf_iface == gmrf_iface)
+			return iface;
+	}
+
+	return NULL;
+}
+
+#endif /* _GMRF_PROTO_BABEL_BABEL_H_ */