net: ipv6: Generate random IID for addresses on RAWIP devices

RAWIP devices such as rmnet do not have a hardware address and
instead require the kernel to generate a random IID for the
IPv6 addresses.
Signed-off-by: Sean Tranchetti <stranche@codeaurora.org>
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c

@@ -221,6 +221,10 @@ void rmnet_vnd_setup(struct net_device *rmnet_dev)
 
 	rmnet_dev->needs_free_netdev = true;
 	rmnet_dev->ethtool_ops = &rmnet_ethtool_ops;
+
+	/* This perm addr will be used as interface identifier by IPv6 */
+	rmnet_dev->addr_assign_type = NET_ADDR_RANDOM;
+	eth_random_addr(rmnet_dev->perm_addr);
 }
 
 /* Exposed API */

net/ipv6/addrconf.c

@@ -2251,6 +2251,7 @@ static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
 		return addrconf_ifid_ieee1394(eui, dev);
 	case ARPHRD_TUNNEL6:
 	case ARPHRD_IP6GRE:
+	case ARPHRD_RAWIP:
 		return addrconf_ifid_ip6tnl(eui, dev);
 	}
 	return -1;
@@ -3286,7 +3287,8 @@ static void addrconf_dev_config(struct net_device *dev)
 	    (dev->type != ARPHRD_IP6GRE) &&
 	    (dev->type != ARPHRD_IPGRE) &&
 	    (dev->type != ARPHRD_TUNNEL) &&
-	    (dev->type != ARPHRD_NONE)) {
+	    (dev->type != ARPHRD_NONE) &&
+	    (dev->type != ARPHRD_RAWIP)) {
 		/* Alas, we support only Ethernet autoconfiguration. */
 		return;
 	}