6lowpan: Moving generic compression code into 6lowpan_iphc.c

Because the IEEE 802154 and Bluetooth share the IP header compression
and uncompression code, the common code is moved to 6lowpan_iphc.c
file.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Acked-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/ieee802154/6lowpan.h

@@ -232,6 +232,28 @@
 					dest = 16 bit inline */
 #define LOWPAN_NHC_UDP_CS_P_11	0xF3 /* source & dest = 0xF0B + 4bit inline */
 
+static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
+{
+	if (unlikely(!pskb_may_pull(skb, 1)))
+		return -EINVAL;
+
+	*val = skb->data[0];
+	skb_pull(skb, 1);
+
+	return 0;
+}
+
+static inline int lowpan_fetch_skb_u16(struct sk_buff *skb, u16 *val)
+{
+	if (unlikely(!pskb_may_pull(skb, 2)))
+		return -EINVAL;
+
+	*val = (skb->data[0] << 8) | skb->data[1];
+	skb_pull(skb, 2);
+
+	return 0;
+}
+
 static inline bool lowpan_fetch_skb(struct sk_buff *skb,
 		void *data, const unsigned int len)
 {
@@ -244,4 +266,14 @@ static inline bool lowpan_fetch_skb(struct sk_buff *skb,
 	return false;
 }
 
+typedef int (*skb_delivery_cb)(struct sk_buff *skb, struct net_device *dev);
+
+int lowpan_process_data(struct sk_buff *skb, struct net_device *dev,
+		const u8 *saddr, const u8 saddr_type, const u8 saddr_len,
+		const u8 *daddr, const u8 daddr_type, const u8 daddr_len,
+		u8 iphc0, u8 iphc1, skb_delivery_cb skb_deliver);
+int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
+			unsigned short type, const void *_daddr,
+			const void *_saddr, unsigned int len);
+
 #endif /* __6LOWPAN_H__ */

net/ieee802154/Makefile

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