vlan: Change vlan_dev_set_vlan_flag() to handle multiple flags at once

Change vlan_dev_set_vlan_flag() to handle multiple flags at once and
rename to vlan_dev_change_flags(). This allows to to use it from the
netlink interface, which in turn allows to handle necessary adjustments
when changing flags centrally.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/8021q/vlan.c

@@ -591,9 +591,9 @@ static int vlan_ioctl_handler(struct net *net, void __user *arg)
 		err = -EPERM;
 		if (!capable(CAP_NET_ADMIN))
 			break;
-		err = vlan_dev_set_vlan_flag(dev,
-					     args.u.flag,
-					     args.vlan_qos);
+		err = vlan_dev_change_flags(dev,
+					    args.vlan_qos ? args.u.flag : 0,
+					    args.u.flag);
 		break;
 
 	case SET_VLAN_NAME_TYPE_CMD:

net/8021q/vlan.h

@@ -28,8 +28,7 @@ void vlan_dev_set_ingress_priority(const struct net_device *dev,
 				   u32 skb_prio, short vlan_prio);
 int vlan_dev_set_egress_priority(const struct net_device *dev,
 				 u32 skb_prio, short vlan_prio);
-int vlan_dev_set_vlan_flag(const struct net_device *dev,
-			   u32 flag, short flag_val);
+int vlan_dev_change_flags(const struct net_device *dev, u32 flag, u32 mask);
 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result);
 void vlan_dev_get_vid(const struct net_device *dev, unsigned short *result);
 

net/8021q/vlan_dev.c

@@ -507,18 +507,16 @@ int vlan_dev_set_egress_priority(const struct net_device *dev,
 }
 
 /* Flags are defined in the vlan_flags enum in include/linux/if_vlan.h file. */
-int vlan_dev_set_vlan_flag(const struct net_device *dev,
-			   u32 flag, short flag_val)
+int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask)
 {
-	/* verify flag is supported */
-	if (flag == VLAN_FLAG_REORDER_HDR) {
-		if (flag_val)
-			vlan_dev_info(dev)->flags |= VLAN_FLAG_REORDER_HDR;
-		else
-			vlan_dev_info(dev)->flags &= ~VLAN_FLAG_REORDER_HDR;
-		return 0;
-	}
+	struct vlan_dev_info *vlan = vlan_dev_info(dev);
+	u32 old_flags = vlan->flags;
+
+	if (mask & ~VLAN_FLAG_REORDER_HDR)
 		return -EINVAL;
+
+	vlan->flags = (old_flags & ~mask) | (flags & mask);
+	return 0;
 }
 
 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result)

net/8021q/vlan_netlink.c

@@ -75,7 +75,6 @@ static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
 static int vlan_changelink(struct net_device *dev,
 			   struct nlattr *tb[], struct nlattr *data[])
 {
-	struct vlan_dev_info *vlan = vlan_dev_info(dev);
 	struct ifla_vlan_flags *flags;
 	struct ifla_vlan_qos_mapping *m;
 	struct nlattr *attr;
@@ -83,8 +82,7 @@ static int vlan_changelink(struct net_device *dev,
 
 	if (data[IFLA_VLAN_FLAGS]) {
 		flags = nla_data(data[IFLA_VLAN_FLAGS]);
-		vlan->flags = (vlan->flags & ~flags->mask) |
-			      (flags->flags & flags->mask);
+		vlan_dev_change_flags(dev, flags->flags, flags->mask);
 	}
 	if (data[IFLA_VLAN_INGRESS_QOS]) {
 		nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {