ieee820154: 6lowpan: dispatch evaluation rework
This patch complete reworks the evaluation of 6lowpan dispatch value by
introducing a receive handler mechanism for each dispatch value.
A list of changes:
- Doing uncompression on-the-fly when FRAG1 is received, this require
some special handling for 802.15.4 lltype in generic 6lowpan branch
for setting the payload length correct.
- Fix dispatch mask for fragmentation.
- Add IPv6 dispatch evaluation for FRAG1.
- Add skb_unshare for dispatch which might manipulate the skb data
buffer.
Cc: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h
index a2f59ec..3509841 100644
--- a/include/net/6lowpan.h
+++ b/include/net/6lowpan.h
@@ -126,13 +126,19 @@
(((a)[6]) == 0xFF) && \
(((a)[7]) == 0xFF))
-#define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
-#define LOWPAN_DISPATCH_HC1 0x42 /* 01000010 = 66 */
-#define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
-#define LOWPAN_DISPATCH_FRAG1 0xc0 /* 11000xxx */
-#define LOWPAN_DISPATCH_FRAGN 0xe0 /* 11100xxx */
+#define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
+#define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
+#define LOWPAN_DISPATCH_IPHC_MASK 0xe0
-#define LOWPAN_DISPATCH_MASK 0xf8 /* 11111000 */
+static inline bool lowpan_is_ipv6(u8 dispatch)
+{
+ return dispatch == LOWPAN_DISPATCH_IPV6;
+}
+
+static inline bool lowpan_is_iphc(u8 dispatch)
+{
+ return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC;
+}
#define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */
@@ -218,6 +224,19 @@
return netdev_priv(dev);
}
+struct lowpan_802154_cb {
+ u16 d_tag;
+ unsigned int d_size;
+ u8 d_offset;
+};
+
+static inline
+struct lowpan_802154_cb *lowpan_802154_cb(const struct sk_buff *skb)
+{
+ BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb));
+ return (struct lowpan_802154_cb *)skb->cb;
+}
+
#ifdef DEBUG
/* print data in line */
static inline void raw_dump_inline(const char *caller, char *msg,