[IPV6]: ADDRCONF: Split up ipv6_generate_eui64() by device type.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/addrconf.c

@@ -1299,52 +1299,67 @@ static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
 	__ipv6_dev_ac_dec(ifp->idev, &addr);
 }
 
+static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
+{
+	if (dev->addr_len != ETH_ALEN)
+		return -1;
+	memcpy(eui, dev->dev_addr, 3);
+	memcpy(eui + 5, dev->dev_addr + 3, 3);
+
+	/*
+	 * The zSeries OSA network cards can be shared among various
+	 * OS instances, but the OSA cards have only one MAC address.
+	 * This leads to duplicate address conflicts in conjunction
+	 * with IPv6 if more than one instance uses the same card.
+	 *
+	 * The driver for these cards can deliver a unique 16-bit
+	 * identifier for each instance sharing the same card.  It is
+	 * placed instead of 0xFFFE in the interface identifier.  The
+	 * "u" bit of the interface identifier is not inverted in this
+	 * case.  Hence the resulting interface identifier has local
+	 * scope according to RFC2373.
+	 */
+	if (dev->dev_id) {
+		eui[3] = (dev->dev_id >> 8) & 0xFF;
+		eui[4] = dev->dev_id & 0xFF;
+	} else {
+		eui[3] = 0xFF;
+		eui[4] = 0xFE;
+		eui[0] ^= 2;
+	}
+	return 0;
+}
+
+static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
+{
+	/* XXX: inherit EUI-64 from other interface -- yoshfuji */
+	if (dev->addr_len != ARCNET_ALEN)
+		return -1;
+	memset(eui, 0, 7);
+	eui[7] = *(u8*)dev->dev_addr;
+	return 0;
+}
+
+static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
+{
+	if (dev->addr_len != INFINIBAND_ALEN)
+		return -1;
+	memcpy(eui, dev->dev_addr + 12, 8);
+	eui[0] |= 2;
+	return 0;
+}
+
 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
 {
 	switch (dev->type) {
 	case ARPHRD_ETHER:
 	case ARPHRD_FDDI:
 	case ARPHRD_IEEE802_TR:
-		if (dev->addr_len != ETH_ALEN)
-			return -1;
-		memcpy(eui, dev->dev_addr, 3);
-		memcpy(eui + 5, dev->dev_addr + 3, 3);
-
-		/*
-		 * The zSeries OSA network cards can be shared among various
-		 * OS instances, but the OSA cards have only one MAC address.
-		 * This leads to duplicate address conflicts in conjunction
-		 * with IPv6 if more than one instance uses the same card.
-		 * 
-		 * The driver for these cards can deliver a unique 16-bit
-		 * identifier for each instance sharing the same card.  It is
-		 * placed instead of 0xFFFE in the interface identifier.  The
-		 * "u" bit of the interface identifier is not inverted in this
-		 * case.  Hence the resulting interface identifier has local
-		 * scope according to RFC2373.
-		 */
-		if (dev->dev_id) {
-			eui[3] = (dev->dev_id >> 8) & 0xFF;
-			eui[4] = dev->dev_id & 0xFF;
-		} else {
-			eui[3] = 0xFF;
-			eui[4] = 0xFE;
-			eui[0] ^= 2;
-		}
-		return 0;
+		return addrconf_ifid_eui48(eui, dev);
 	case ARPHRD_ARCNET:
-		/* XXX: inherit EUI-64 from other interface -- yoshfuji */
-		if (dev->addr_len != ARCNET_ALEN)
-			return -1;
-		memset(eui, 0, 7);
-		eui[7] = *(u8*)dev->dev_addr;
-		return 0;
+		return addrconf_ifid_arcnet(eui, dev);
 	case ARPHRD_INFINIBAND:
-		if (dev->addr_len != INFINIBAND_ALEN)
-			return -1;
-		memcpy(eui, dev->dev_addr + 12, 8);
-		eui[0] |= 2;
-		return 0;
+		return addrconf_ifid_infiniband(eui, dev);
 	}
 	return -1;
 }