bonding: add arp_validate netlink support

Add IFLA_BOND_ARP_VALIDATE to allow get/set of bonding parameter
arp_validate via netlink.

Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index 6d30e5d..8588cb9 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -30,6 +30,7 @@
 	[IFLA_BOND_USE_CARRIER]		= { .type = NLA_U8 },
 	[IFLA_BOND_ARP_INTERVAL]	= { .type = NLA_U32 },
 	[IFLA_BOND_ARP_IP_TARGET]	= { .type = NLA_NESTED },
+	[IFLA_BOND_ARP_VALIDATE]	= { .type = NLA_U32 },
 };
 
 static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
@@ -131,6 +132,19 @@
 		if (err)
 			return err;
 	}
+	if (data[IFLA_BOND_ARP_VALIDATE]) {
+		int arp_validate = nla_get_u32(data[IFLA_BOND_ARP_VALIDATE]);
+
+		if (arp_validate && miimon) {
+			pr_err("%s: ARP validating cannot be used with MII monitoring.\n",
+			       bond->dev->name);
+			return -EINVAL;
+		}
+
+		err = bond_option_arp_validate_set(bond, arp_validate);
+		if (err)
+			return err;
+	}
 	return 0;
 }
 
@@ -157,6 +171,7 @@
 		nla_total_size(sizeof(u32)) +	/* IFLA_BOND_ARP_INTERVAL */
 						/* IFLA_BOND_ARP_IP_TARGET */
 		nla_total_size(sizeof(u32)) * BOND_MAX_ARP_TARGETS +
+		nla_total_size(sizeof(u32)) +	/* IFLA_BOND_ARP_VALIDATE */
 		0;
 }
 
@@ -209,6 +224,9 @@
 	else
 		nla_nest_cancel(skb, targets);
 
+	if (nla_put_u32(skb, IFLA_BOND_ARP_VALIDATE, bond->params.arp_validate))
+		goto nla_put_failure;
+
 	return 0;
 
 nla_put_failure: