2 files changed, 11 insertions, 4 deletions

diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 1ed2a5cc03f5..3db7767d2a17 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -51,6 +51,15 @@ struct can_priv {
         struct sk_buff **echo_skb;
 };
 
+/*
+ * get_can_dlc(value) - helper macro to cast a given data length code (dlc)
+ * to __u8 and ensure the dlc value to be max. 8 bytes.
+ *
+ * To be used in the CAN netdriver receive path to ensure conformance with
+ * ISO 11898-1 Chapter 8.4.2.3 (DLC field)
+ */
+#define get_can_dlc(i)  (min_t(__u8, (i), 8))
+
 struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max);
 void free_candev(struct net_device *dev);
 
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 14fc906ed602..05330fc5b436 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -368,11 +368,9 @@ enum {
 #define RTAX_MAX (__RTAX_MAX - 1)
 
 #define RTAX_FEATURE_ECN        0x00000001
-#define RTAX_FEATURE_NO_SACK    0x00000002
-#define RTAX_FEATURE_NO_TSTAMP  0x00000004
+#define RTAX_FEATURE_SACK       0x00000002
+#define RTAX_FEATURE_TIMESTAMP  0x00000004
 #define RTAX_FEATURE_ALLFRAG    0x00000008
-#define RTAX_FEATURE_NO_WSCALE  0x00000010
-#define RTAX_FEATURE_NO_DSACK   0x00000020
 
 struct rta_session {
         __u8    proto;