[NET_SCHED]: cls_flow: support classification based on VLAN tag

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

2 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/pkt_cls.h b/include/linux/pkt_cls.h
index 40fac8c4559d..28dfc61cf79e 100644
--- a/include/linux/pkt_cls.h
+++ b/include/linux/pkt_cls.h
@@ -348,6 +348,7 @@ enum
         FLOW_KEY_RTCLASSID,
         FLOW_KEY_SKUID,
         FLOW_KEY_SKGID,
+        FLOW_KEY_VLAN_TAG,
         __FLOW_KEY_MAX,
 };
 
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index eeb223cf14cf..971b867e0484 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -19,6 +19,7 @@
 #include <linux/in.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
+#include <linux/if_vlan.h>
 
 #include <net/pkt_cls.h>
 #include <net/ip.h>
@@ -270,6 +271,15 @@ static u32 flow_get_skgid(const struct sk_buff *skb)
         return 0;
 }
 
+static u32 flow_get_vlan_tag(const struct sk_buff *skb)
+{
+        u16 uninitialized_var(tag);
+
+        if (vlan_get_tag(skb, &tag) < 0)
+                return 0;
+        return tag & VLAN_VID_MASK;
+}
+
 static u32 flow_key_get(const struct sk_buff *skb, int key)
 {
         switch (key) {
@@ -305,6 +315,8 @@ static u32 flow_key_get(const struct sk_buff *skb, int key)
                 return flow_get_skuid(skb);
         case FLOW_KEY_SKGID:
                 return flow_get_skgid(skb);
+        case FLOW_KEY_VLAN_TAG:
+                return flow_get_vlan_tag(skb);
         default:
                 WARN_ON(1);
                 return 0;