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-rw-r--r--include/linux/etherdevice.h35
1 files changed, 28 insertions, 7 deletions
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 4522c7186bf..5f49a30eb6f 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -48,8 +48,10 @@ static inline void eth_copy_and_sum (struct sk_buff *dest,
}
/**
- * is_zero_ether_addr - Determine if give Ethernet address is all
- * zeros.
+ * is_zero_ether_addr - Determine if give Ethernet address is all zeros.
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Return true if the address is all zeroes.
*/
static inline int is_zero_ether_addr(const u8 *addr)
{
@@ -57,9 +59,7 @@ static inline int is_zero_ether_addr(const u8 *addr)
}
/**
- * is_multicast_ether_addr - Determine if the given Ethernet address is a
- * multicast address.
- *
+ * is_multicast_ether_addr - Determine if the Ethernet address is a multicast.
* @addr: Pointer to a six-byte array containing the Ethernet address
*
* Return true if the address is a multicast address.
@@ -69,10 +69,15 @@ static inline int is_multicast_ether_addr(const u8 *addr)
return ((addr[0] != 0xff) && (0x01 & addr[0]));
}
+/**
+ * is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Return true if the address is the broadcast address.
+ */
static inline int is_broadcast_ether_addr(const u8 *addr)
{
- return ((addr[0] == 0xff) && (addr[1] == 0xff) && (addr[2] == 0xff) &&
- (addr[3] == 0xff) && (addr[4] == 0xff) && (addr[5] == 0xff));
+ return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff;
}
/**
@@ -104,6 +109,22 @@ static inline void random_ether_addr(u8 *addr)
addr [0] &= 0xfe; /* clear multicast bit */
addr [0] |= 0x02; /* set local assignment bit (IEEE802) */
}
+
+/**
+ * compare_ether_addr - Compare two Ethernet addresses
+ * @addr1: Pointer to a six-byte array containing the Ethernet address
+ * @addr2: Pointer other six-byte array containing the Ethernet address
+ *
+ * Compare two ethernet addresses, returns 0 if equal
+ */
+static inline unsigned compare_ether_addr(const u8 *addr1, const u8 *addr2)
+{
+ const u16 *a = (const u16 *) addr1;
+ const u16 *b = (const u16 *) addr2;
+
+ BUILD_BUG_ON(ETH_ALEN != 6);
+ return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2])) != 0;
+}
#endif /* __KERNEL__ */
#endif /* _LINUX_ETHERDEVICE_H */