[PATCH v4 4/5] ipv6: addrconf: fix 48 bit 6lowpan autoconfiguration

[Luiz Augusto von Dentz]

From: Alexander Aring <a...@pengutronix.de>

This patch adds support for 48 bit 6LoWPAN address length
autoconfiguration which is the case for BTLE 6LoWPAN.

Signed-off-by: Alexander Aring <a...@pengutronix.de>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.de...@intel.com>
Reviewed-by: Stefan Schmidt <ste...@osg.samsung.com>
---
 net/ipv6/addrconf.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 3a2025f..7756640 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2052,12 +2052,19 @@ static void addrconf_leave_anycast(struct inet6_ifaddr 
*ifp)
        __ipv6_dev_ac_dec(ifp->idev, &addr);
 }
 
-static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
+static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
 {
-       if (dev->addr_len != EUI64_ADDR_LEN)
+       switch (dev->addr_len) {
+       case ETH_ALEN:
+               return addrconf_ifid_eui48(eui, dev);
+       case EUI64_ADDR_LEN:
+               memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
+               eui[0] ^= 2;
+               break;
+       default:
                return -1;
-       memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
-       eui[0] ^= 2;
+       }
+
        return 0;
 }
 
@@ -2149,7 +2156,7 @@ static int ipv6_generate_eui64(u8 *eui, struct net_device 
*dev)
        case ARPHRD_TUNNEL:
                return addrconf_ifid_gre(eui, dev);
        case ARPHRD_6LOWPAN:
-               return addrconf_ifid_eui64(eui, dev);
+               return addrconf_ifid_6lowpan(eui, dev);
        case ARPHRD_IEEE1394:
                return addrconf_ifid_ieee1394(eui, dev);
        case ARPHRD_TUNNEL6:
-- 
2.9.3