From 6f1356ca96a94def3998f4d99105540b37de6939 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Tue, 27 Sep 2005 16:03:05 -0700
Subject: [PATCH] --- yaml --- r: 9442 b: refs/heads/master c:
 ba645c16026ed733a51f904df34756f61bc155fc h: refs/heads/master v: v3

---
 [refs]                   |  2 +-
 trunk/net/ethernet/eth.c | 31 +++++++++++++++++++++----------
 2 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/[refs] b/[refs]
index 03e571a3c911..2c0ec1122e3c 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2fab35d78f32fc107e1af4b1ec23f557fa20d911
+refs/heads/master: ba645c16026ed733a51f904df34756f61bc155fc
diff --git a/trunk/net/ethernet/eth.c b/trunk/net/ethernet/eth.c
index 87a052a9a84f..8b299cc82060 100644
--- a/trunk/net/ethernet/eth.c
+++ b/trunk/net/ethernet/eth.c
@@ -146,6 +146,19 @@ int eth_rebuild_header(struct sk_buff *skb)
 	return 0;
 }
 
+static inline unsigned int compare_eth_addr(const unsigned char *__a, const unsigned char *__b)
+{
+	const unsigned short *dest = (unsigned short *) __a;
+	const unsigned short *devaddr = (unsigned short *) __b;
+	unsigned int res;
+
+	BUILD_BUG_ON(ETH_ALEN != 6);
+	res = ((dest[0] ^ devaddr[0]) |
+	       (dest[1] ^ devaddr[1]) |
+	       (dest[2] ^ devaddr[2])) != 0;
+
+	return res;
+}
 
 /*
  *	Determine the packet's protocol ID. The rule here is that we 
@@ -158,16 +171,15 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
 	struct ethhdr *eth;
 	unsigned char *rawp;
 	
-	skb->mac.raw=skb->data;
+	skb->mac.raw = skb->data;
 	skb_pull(skb,ETH_HLEN);
 	eth = eth_hdr(skb);
 	
-	if(*eth->h_dest&1)
-	{
-		if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
-			skb->pkt_type=PACKET_BROADCAST;
+	if (*eth->h_dest&1) {
+		if (!compare_eth_addr(eth->h_dest, dev->broadcast))
+			skb->pkt_type = PACKET_BROADCAST;
 		else
-			skb->pkt_type=PACKET_MULTICAST;
+			skb->pkt_type = PACKET_MULTICAST;
 	}
 	
 	/*
@@ -178,10 +190,9 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
 	 *	seems to set IFF_PROMISC.
 	 */
 	 
-	else if(1 /*dev->flags&IFF_PROMISC*/)
-	{
-		if(memcmp(eth->h_dest,dev->dev_addr, ETH_ALEN))
-			skb->pkt_type=PACKET_OTHERHOST;
+	else if(1 /*dev->flags&IFF_PROMISC*/) {
+		if (unlikely(!compare_eth_addr(eth->h_dest, dev->dev_addr)))
+			skb->pkt_type = PACKET_OTHERHOST;
 	}
 	
 	if (ntohs(eth->h_proto) >= 1536)