From: Tony Cheneau <tony.cheneau@amnesiak.org>
Date: Mon, 25 Mar 2013 17:59:21 +0000 (+0000)
Subject: 6lowpan: lowpan_is_iid_16_bit_compressable() does not detect compressible address... 
X-Git-Tag: firefly_0821_release~3680^2~548^2~336^2~11
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8d879a3f9856fe6c6e27853a96c0beaed03acb2c;p=firefly-linux-kernel-4.4.55.git

6lowpan: lowpan_is_iid_16_bit_compressable() does not detect compressible address correctly

The current test is not RFC6282 compliant. The same issue has been found
and fixed in Contiki. This patch is basically a port of their fix.

Signed-off-by: Tony Cheneau <tony.cheneau@amnesiak.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ieee802154/6lowpan.h b/net/ieee802154/6lowpan.h
index bba5f8336317..4b8f917658b5 100644
--- a/net/ieee802154/6lowpan.h
+++ b/net/ieee802154/6lowpan.h
@@ -92,9 +92,10 @@
  */
 #define lowpan_is_iid_16_bit_compressable(a)	\
 	((((a)->s6_addr16[4]) == 0) &&		\
-	 (((a)->s6_addr16[5]) == 0) &&		\
-	 (((a)->s6_addr16[6]) == 0) &&		\
-	 ((((a)->s6_addr[14]) & 0x80) == 0))
+	 (((a)->s6_addr[10]) == 0) &&		\
+	 (((a)->s6_addr[11]) == 0xff) &&	\
+	 (((a)->s6_addr[12]) == 0xfe) &&	\
+	 (((a)->s6_addr[13]) == 0))
 
 /* multicast address */
 #define is_addr_mcast(a) (((a)->s6_addr[0]) == 0xFF)