Add the AODVv2 Routing Protocol

This PR depends on RIOT-OS#1766.

It contains a minimal implementation of the AODVv2 routing protocol.
*Not* implemented are:

	- AckReqs
	- alternate metrics
	- multiple interfaces
	- clients and Client Networks
	- buffering
	- all addresses, TLVs, and features that are marked as optional

An example application can be found at https:/Lotterleben/RIOT-AODVv2/tree/master/aodvv2_demo.

The implementation relies heavily on a functioning Neighbor Discovery Protocol.
It might be necessary to fill the neighbor cache manually with the current state
of RIOTs NDP implementation.

The value of AODVV2_MAX_UNREACHABLE_NODES has been chosen arbitrarily and will be subject to
future improvement.

Please note that based on my experience, with the default transceiver
buffer size (3) of the native port, about 2/3 of the route discoveries
will fail. This has been addressed in issue RIOT-OS#1747. It is advised to increase
the transceiver buffer size when using AODVv2 as a routing protocol.

Makefile.dep

@@ -47,6 +47,21 @@ ifneq (,$(filter sixlowpan,$(USEMODULE)))
  USEMODULE += vtimer
 endif
 
+ifneq (,$(filter aodvv2,$(USEMODULE)))
+ ifeq (,$(filter vtimer,$(USEMODULE)))
+ USEMODULE += vtimer
+ endif
+ ifeq (,$(filter sixlowpan,$(USEMODULE)))
+ USEMODULE += sixlowpan
+ endif
+ ifeq (,$(filter oonf_common,$(USEMODULE)))
+ USEMODULE += oonf_common
+ endif
+ ifeq (,$(filter oonf_rfc5444,$(USEMODULE)))
+ USEMODULE += oonf_rfc5444
+ endif
+endif
+
 ifneq (,$(filter uart0,$(USEMODULE)))
  USEMODULE += lib
  USEMODULE += posix

sys/Makefile

@@ -80,6 +80,9 @@ endif
 ifneq (,$(filter routing,$(USEMODULE)))
  DIRS += net/routing
 endif
+ifneq (,$(filter aodvv2,$(USEMODULE)))
+ DIRS += net/routing/aodvv2
+endif
 ifneq (,$(filter ieee802154,$(USEMODULE)))
  DIRS += net/link_layer/ieee802154
 endif

sys/net/include/aodvv2/aodvv2.h

@@ -0,0 +1,10 @@
+#include "common/netaddr.h"
+#include "rfc5444/rfc5444_print.h"
+
+#ifndef AODVV2_H_
+#define AODVV2_H_
+
+void aodv_init(void);
+void aodv_set_metric_type(int metric_type);
+
+#endif /* AODVV2_H_ */

sys/net/routing/aodvv2/Makefile

@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base