X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fetherdevice.h;h=745c988359c0bb29628609062c7d7a59c424ba45;hb=c2ecba71717c4f60671175fd26083c35a4b9ad58;hp=4522c7186bf378de1c4162b042ad8a3b78fc09ac;hpb=327309e899662b482c58cf25f574513d38b5788c;p=safe%2Fjmp%2Flinux-2.6

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 4522c71..745c988 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)
 {
@@ -57,22 +59,26 @@ 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.
+ * By definition the broadcast address is also a multicast address.
  */
 static inline int is_multicast_ether_addr(const u8 *addr)
 {
-	return ((addr[0] != 0xff) && (0x01 & addr[0]));
+	return (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 +110,22 @@ 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 */