6lowpan: introduce new net/6lowpan directory

This patch moves generic code which is used by bluetooth and ieee802154
6lowpan to a new net/6lowpan directory. This directory contains generic
6LoWPAN code which is shared between bluetooth and ieee802154 MAC-Layer.

This is the IPHC - "IPv6 Header Compression" format at the moment. Which
is described by RFC 6282 [0]. The BLTE 6LoWPAN draft describes that the
IPHC is the same format like IEEE 802.15.4, see [1].

Futuremore we can put more code into this directory which is shared
between BLTE and IEEE 802.15.4 6LoWPAN like RFC 6775 or the routing
protocol RPL RFC 6550.

To avoid naming conflicts I renamed 6lowpan-y to ieee802154_6lowpan-y
in net/ieee802154/Makefile.

[0] http://tools.ietf.org/html/rfc6282
[1] http://tools.ietf.org/html/draft-ietf-6lowpan-btle-12#section-3.2
[2] http://tools.ietf.org/html/rfc6775
[3] http://tools.ietf.org/html/rfc6550Signed-off-by: NAlexander Aring <alex.aring@gmail.com>
Acked-by: NJukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/6lowpan/Kconfig

+config 6LOWPAN
+	bool "6LoWPAN Support"
+	depends on IPV6
+	---help---
+	  This enables IPv6 over Low power Wireless Personal Area Network -
+	  "6LoWPAN" which is supported by IEEE 802.15.4 or Bluetooth stacks.

net/6lowpan/Makefile

+obj-$(CONFIG_6LOWPAN) := 6lowpan.o
+
+6lowpan-y := iphc.o

net/Kconfig

@@ -214,6 +214,7 @@ source "drivers/net/appletalk/Kconfig"
 source "net/x25/Kconfig"
 source "net/lapb/Kconfig"
 source "net/phonet/Kconfig"
+source "net/6lowpan/Kconfig"
 source "net/ieee802154/Kconfig"
 source "net/mac802154/Kconfig"
 source "net/sched/Kconfig"

net/Makefile

@@ -57,7 +57,8 @@ obj-$(CONFIG_CAIF)		+= caif/
 ifneq ($(CONFIG_DCB),)
 obj-y				+= dcb/
 endif
-obj-y				+= ieee802154/
+obj-$(CONFIG_6LOWPAN)		+= 6lowpan/
+obj-$(CONFIG_IEEE802154)	+= ieee802154/
 obj-$(CONFIG_MAC802154)		+= mac802154/
 
 ifeq ($(CONFIG_NET),y)

net/bluetooth/Kconfig

@@ -41,8 +41,7 @@ menuconfig BT
 
 config BT_6LOWPAN
 	tristate "Bluetooth 6LoWPAN support"
-	depends on BT && IPV6
-	select 6LOWPAN_IPHC if BT_6LOWPAN
+	depends on BT && 6LOWPAN
 	help
 	  IPv6 compression over Bluetooth Low Energy.
 

net/ieee802154/Kconfig

@@ -12,13 +12,6 @@ config IEEE802154
 
 config IEEE802154_6LOWPAN
 	tristate "6lowpan support over IEEE 802.15.4"
-	depends on IEEE802154 && IPV6
-	select 6LOWPAN_IPHC
+	depends on IEEE802154 && 6LOWPAN
 	---help---
 	  IPv6 compression over IEEE 802.15.4.
-
-config 6LOWPAN_IPHC
-	tristate
-	---help---
-	  6lowpan compression code which is shared between IEEE 802.15.4 and Bluetooth
-	  stacks.

net/ieee802154/Makefile

 obj-$(CONFIG_IEEE802154) += ieee802154.o af_802154.o
-obj-$(CONFIG_IEEE802154_6LOWPAN) += 6lowpan.o
-obj-$(CONFIG_6LOWPAN_IPHC) += 6lowpan_iphc.o
+obj-$(CONFIG_IEEE802154_6LOWPAN) += ieee802154_6lowpan.o
 
-6lowpan-y := 6lowpan_rtnl.o reassembly.o
+ieee802154_6lowpan-y := 6lowpan_rtnl.o reassembly.o
 ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o wpan-class.o \
                 header_ops.o
 af_802154-y := af_ieee802154.o raw.o dgram.o