6lowpan: lowpan_uncompress_addr with address_mode
This patch drops the pre and postcount calculation from the
lowpan_uncompress_addr function.We use instead a switch/case
over address_mode value. The original implementation has several
bugs in this function and it was hard to decrypt how it works.
To make it maintainable and fix these bugs this patch basically
reimplements lowpan_uncompress_addr from scratch.
A list of bugs we found in the current implementation:
1) Properly support uncompression of short-address based IPv6 addresses
(instead of basically copying garbage)
2) Fix use and uncompression of long-addresses based IPv6 addresses
3) Add missing ff:fe00 in the case of SAM/DAM = 2 and M = 0
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reviewed-by: Werner Almesberger <werner@almesberger.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ieee802154/6lowpan.h b/net/ieee802154/6lowpan.h
index a636545..2869c05 100644
--- a/net/ieee802154/6lowpan.h
+++ b/net/ieee802154/6lowpan.h
@@ -193,10 +193,12 @@
/* Values of fields within the IPHC encoding second byte */
#define LOWPAN_IPHC_CID 0x80
+#define LOWPAN_IPHC_ADDR_00 0x00
+#define LOWPAN_IPHC_ADDR_01 0x01
+#define LOWPAN_IPHC_ADDR_02 0x02
+#define LOWPAN_IPHC_ADDR_03 0x03
+
#define LOWPAN_IPHC_SAC 0x40
-#define LOWPAN_IPHC_SAM_00 0x00
-#define LOWPAN_IPHC_SAM_01 0x10
-#define LOWPAN_IPHC_SAM_10 0x20
#define LOWPAN_IPHC_SAM 0x30
#define LOWPAN_IPHC_SAM_BIT 4