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authorToshiaki Makita <makita.toshiaki@lab.ntt.co.jp>2013-10-16 17:07:14 +0900
committerDavid S. Miller <davem@davemloft.net>2013-10-18 16:02:53 -0400
commitb90356ce17c2b199cd55530cb9c3cfabe18dbdc3 (patch)
treeb60f74bde46c45d0c1208be5f92c2e823f4112ab /net/bridge
parent8adff41c3d259eb5e313b7b04669eee545925154 (diff)
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bridge: Apply the PVID to priority-tagged frames
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>
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/br_vlan.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 21b6d21..5a9c44a 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -189,6 +189,8 @@ out:
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;
}