ieee802154: reassembly: fix tag byteorder

This patch fix byte order handling in reassembly code of 802.15.4
6LoWPAN fragmentation handling.

net/ieee802154/reassembly.c:58:43: warning: restricted __be16 degrades to integer

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reported-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/ieee802154/reassembly.c

@@ -33,7 +33,7 @@
 static const char lowpan_frags_cache_name[] = "lowpan-frags";
 
 struct lowpan_frag_info {
-	__be16 d_tag;
+	u16 d_tag;
 	u16 d_size;
 	u8 d_offset;
 };
@@ -48,7 +48,7 @@ static struct inet_frags lowpan_frags;
 static int lowpan_frag_reasm(struct lowpan_frag_queue *fq,
 			     struct sk_buff *prev, struct net_device *dev);
 
-static unsigned int lowpan_hash_frag(__be16 tag, u16 d_size,
+static unsigned int lowpan_hash_frag(u16 tag, u16 d_size,
 				     const struct ieee802154_addr *saddr,
 				     const struct ieee802154_addr *daddr)
 {
@@ -330,11 +330,13 @@ static int lowpan_get_frag_info(struct sk_buff *skb, const u8 frag_type,
 {
 	bool fail;
 	u8 pattern = 0, low = 0;
+	__be16 d_tag = 0;
 
 	fail = lowpan_fetch_skb(skb, &pattern, 1);
 	fail |= lowpan_fetch_skb(skb, &low, 1);
 	frag_info->d_size = (pattern & 7) << 8 | low;
-	fail |= lowpan_fetch_skb(skb, &frag_info->d_tag, 2);
+	fail |= lowpan_fetch_skb(skb, &d_tag, 2);
+	frag_info->d_tag = ntohs(d_tag);
 
 	if (frag_type == LOWPAN_DISPATCH_FRAGN) {
 		fail |= lowpan_fetch_skb(skb, &frag_info->d_offset, 1);

net/ieee802154/reassembly.h

@@ -4,7 +4,7 @@
 #include <net/inet_frag.h>
 
 struct lowpan_create_arg {
-	__be16 tag;
+	u16 tag;
 	u16 d_size;
 	const struct ieee802154_addr *src;
 	const struct ieee802154_addr *dst;
@@ -15,7 +15,7 @@ struct lowpan_create_arg {
 struct lowpan_frag_queue {
 	struct inet_frag_queue	q;
 
-	__be16			tag;
+	u16			tag;
 	u16			d_size;
 	struct ieee802154_addr	saddr;
 	struct ieee802154_addr	daddr;