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vlan: allow null VLAN ID to be used

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We currently use a 16 bit field (vlan_tci) to store VLAN ID/PRIO on a skb.

Null value is used as a special value, meaning vlan tagging not enabled.
This forbids use of null vlan ID.

As pointed by David, some drivers use the 3 high order bits (PRIO)

As VLAN ID is 12 bits, we can use the remaining bit (CFI) as a flag, and
allow null VLAN ID.

In case future code really wants to use VLAN_CFI_MASK, we'll have to use
a bit outside of vlan_tci.

#define VLAN_PRIO_MASK         0xe000 /* Priority Code Point */
#define VLAN_PRIO_SHIFT        13
#define VLAN_CFI_MASK          0x1000 /* Canonical Format Indicator */
#define VLAN_TAG_PRESENT       VLAN_CFI_MASK
#define VLAN_VID_MASK          0x0fff /* VLAN Identifier */

Reported-by: Gertjan Hofman <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2009-10-26 18:40:35 -07:00 • committed by David S. Miller
commit 05423b2413
5 changed files with 15 additions and 10 deletions
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2
net/8021q/vlan.h
View file

@ -89,7 +89,7 @@ static inline u32 vlan_get_ingress_priority(struct net_device *dev,
{
struct vlan_dev_info *vip = vlan_dev_info(dev);
return vip->ingress_priority_map[(vlan_tci >> 13) & 0x7];
return vip->ingress_priority_map[(vlan_tci >> VLAN_PRIO_SHIFT) & 0x7];
}
#ifdef CONFIG_VLAN_8021Q_GVRP

2
net/8021q/vlan_dev.c
View file

@ -393,7 +393,7 @@ int vlan_dev_set_egress_priority(const struct net_device *dev,
struct vlan_dev_info *vlan = vlan_dev_info(dev);
struct vlan_priority_tci_mapping *mp = NULL;
struct vlan_priority_tci_mapping *np;
u32 vlan_qos = (vlan_prio << 13) & 0xE000;
u32 vlan_qos = (vlan_prio << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
/* See if a priority mapping exists.. */
mp = vlan->egress_priority_map[skb_prio & 0xF];