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>

4 files changed, 14 insertions, 19 deletions

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index ab2225da0ee2..b591bfca1ab2 100644
--- a/net/8021q/vlan.c
+++ b/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:
diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index 5229a72c7ea1..639e2544a804 100644
--- a/net/8021q/vlan.h
+++ b/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);
 
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 5d055c242ed8..76c665cdab66 100644
--- a/net/8021q/vlan_dev.c
+++ b/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;
-        }
-        return -EINVAL;
+        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)
diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
index c93e69ec28ed..fd7cb195d53f 100644
--- a/net/8021q/vlan_netlink.c
+++ b/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) {