[VLAN]: Introduce symbolic constants for flag values

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

Author: kaber

include/linux/if_vlan.h

@@ -398,6 +398,10 @@ enum vlan_ioctl_cmds {
 	GET_VLAN_VID_CMD /* Get the VID of this VLAN (specified by name) */
 };
 
+enum vlan_flags {
+	VLAN_FLAG_REORDER_HDR	= 0x1,
+};
+
 enum vlan_name_types {
 	VLAN_NAME_TYPE_PLUS_VID, /* Name will look like:  vlan0005 */
 	VLAN_NAME_TYPE_RAW_PLUS_VID, /* name will look like:  eth1.0005 */

net/8021q/vlan.c

@@ -565,7 +565,7 @@ static int register_vlan_device(struct net_device *real_dev,
 	VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 	VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 	VLAN_DEV_INFO(new_dev)->dent = NULL;
-	VLAN_DEV_INFO(new_dev)->flags = 1;
+	VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 
 	err = register_vlan_dev(new_dev);
 	if (err < 0)

net/8021q/vlan_dev.c

@@ -73,7 +73,7 @@ int vlan_dev_rebuild_header(struct sk_buff *skb)
 
 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
 {
-	if (VLAN_DEV_INFO(skb->dev)->flags & 1) {
+	if (VLAN_DEV_INFO(skb->dev)->flags & VLAN_FLAG_REORDER_HDR) {
 		if (skb_shared(skb) || skb_cloned(skb)) {
 			struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
 			kfree_skb(skb);
@@ -350,7 +350,8 @@ int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
 	 * header shuffling in the hard_start_xmit.  Users can turn off this
 	 * REORDER behaviour with the vconfig tool.
 	 */
-	build_vlan_header = ((VLAN_DEV_INFO(dev)->flags & 1) == 0);
+	if (!(VLAN_DEV_INFO(dev)->flags & VLAN_FLAG_REORDER_HDR))
+		build_vlan_header = 1;
 
 	if (build_vlan_header) {
 		vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
@@ -584,16 +585,16 @@ int vlan_dev_set_egress_priority(const struct net_device *dev,
 	return 0;
 }
 
-/* Flags are defined in the vlan_dev_info class in include/linux/if_vlan.h file. */
+/* 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)
 {
 	/* verify flag is supported */
-	if (flag == 1) {
+	if (flag == VLAN_FLAG_REORDER_HDR) {
 		if (flag_val) {
-			VLAN_DEV_INFO(dev)->flags |= 1;
+			VLAN_DEV_INFO(dev)->flags |= VLAN_FLAG_REORDER_HDR;
 		} else {
-			VLAN_DEV_INFO(dev)->flags &= ~1;
+			VLAN_DEV_INFO(dev)->flags &= ~VLAN_FLAG_REORDER_HDR;
 		}
 		return 0;
 	}