net: Add extack to validator_info structs used for address notifier

Add extack to in_validator_info and in6_validator_info. Update the one
user of each, ipvlan, to return an error message for failures.

Only manual configuration of an address is plumbed in the IPv6 code path.

Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index 6842739b6679..f0ab55df57f1 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -847,8 +847,11 @@ static int ipvlan_addr6_validator_event(struct notifier_block *unused,
 
         switch (event) {
         case NETDEV_UP:
-                if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true))
+                if (ipvlan_addr_busy(ipvlan->port, &i6vi->i6vi_addr, true)) {
+                        NL_SET_ERR_MSG(i6vi->extack,
+                                       "Address already assigned to an ipvlan device");
                         return notifier_from_errno(-EADDRINUSE);
+                }
                 break;
         }
 
@@ -917,8 +920,11 @@ static int ipvlan_addr4_validator_event(struct notifier_block *unused,
 
         switch (event) {
         case NETDEV_UP:
-                if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false))
+                if (ipvlan_addr_busy(ipvlan->port, &ivi->ivi_addr, false)) {
+                        NL_SET_ERR_MSG(ivi->extack,
+                                       "Address already assigned to an ipvlan device");
                         return notifier_from_errno(-EADDRINUSE);
+                }
                 break;
         }