[RTNETLINK]: rtnl_link: allow specifying initial device address

Drivers need to validate the initial addresses in their netlink attribute
validation function or manually reject them if they can't support this.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index c8e7c8f6ba3e..f5c3598e59af 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -221,10 +221,22 @@ static int ifb_open(struct net_device *dev)
         return 0;
 }
 
+static int ifb_validate(struct nlattr *tb[], struct nlattr *data[])
+{
+        if (tb[IFLA_ADDRESS]) {
+                if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
+                        return -EINVAL;
+                if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
+                        return -EADDRNOTAVAIL;
+        }
+        return 0;
+}
+
 static struct rtnl_link_ops ifb_link_ops __read_mostly = {
         .kind           = "ifb",
         .priv_size      = sizeof(struct ifb_private),
         .setup          = ifb_setup,
+        .validate       = ifb_validate,
 };
 
 /* Number of ifb devices to be set up by this module. */