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bridge: Apply the PVID to priority-tagged frames

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IEEE 802.1Q says that when we receive priority-tagged (VID 0) frames
use the PVID for the port as its VID.
(See IEEE 802.1Q-2011 6.9.1 and Table 9-2)

Apply the PVID to not only untagged frames but also priority-tagged frames.

Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Reviewed-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Toshiaki Makita 2013-10-16 17:07:14 +09:00 committed by David S. Miller
parent 8adff41c3d
commit b90356ce17
1 changed files with 20 additions and 7 deletions
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27
net/bridge/br_vlan.c
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@ -189,6 +189,8 @@ struct sk_buff *br_handle_vlan(struct net_bridge *br,
bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
struct sk_buff *skb, u16 *vid)
{
int err;
/* If VLAN filtering is disabled on the bridge, all packets are
* permitted.
*/
@ -201,20 +203,31 @@ bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
if (!v)
return false;
if (br_vlan_get_tag(skb, vid)) {
err = br_vlan_get_tag(skb, vid);
if (!*vid) {
u16 pvid = br_get_pvid(v);
/* Frame did not have a tag. See if pvid is set
* on this port. That tells us which vlan untagged
* traffic belongs to.
/* Frame had a tag with VID 0 or did not have a tag.
* See if pvid is set on this port. That tells us which
* vlan untagged or priority-tagged traffic belongs to.
*/
if (pvid == VLAN_N_VID)
return false;
/* PVID is set on this port. Any untagged ingress
* frame is considered to belong to this vlan.
/* PVID is set on this port. Any untagged or priority-tagged
* ingress frame is considered to belong to this vlan.
*/
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), pvid);
if (likely(err))
/* Untagged Frame. */
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), pvid);
else
/* Priority-tagged Frame.
* At this point, We know that skb->vlan_tci had
* VLAN_TAG_PRESENT bit and its VID field was 0x000.
* We update only VID field and preserve PCP field.
*/
skb->vlan_tci |= pvid;
return true;
}