From 3113e88c3cb3c0a22920b621f8e4d1f2ccc07f1e Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <shemminger@vyatta.com>
Date: Tue, 5 Feb 2008 03:20:13 -0800
Subject: [PKT_SCHED]: vlan tag match

Provide a way to use tc filters on vlan tag even if tag is buried in
skb due to hardware acceleration.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/sched/em_meta.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'net/sched/em_meta.c')

diff --git a/net/sched/em_meta.c b/net/sched/em_meta.c
index a1e5619b1876..9c2ec1992a2a 100644
--- a/net/sched/em_meta.c
+++ b/net/sched/em_meta.c
@@ -65,6 +65,7 @@
 #include <linux/string.h>
 #include <linux/skbuff.h>
 #include <linux/random.h>
+#include <linux/if_vlan.h>
 #include <linux/tc_ematch/tc_em_meta.h>
 #include <net/dst.h>
 #include <net/route.h>
@@ -169,6 +170,21 @@ META_COLLECTOR(var_dev)
 	*err = var_dev(skb->dev, dst);
 }
 
+/**************************************************************************
+ * vlan tag
+ **************************************************************************/
+
+META_COLLECTOR(int_vlan_tag)
+{
+	unsigned short tag;
+	if (vlan_get_tag(skb, &tag) < 0)
+		*err = -1;
+	else
+		dst->value = tag;
+}
+
+
+
 /**************************************************************************
  * skb attributes
  **************************************************************************/
@@ -520,6 +536,7 @@ static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = {
 		[META_ID(SK_SNDTIMEO)]		= META_FUNC(int_sk_sndtimeo),
 		[META_ID(SK_SENDMSG_OFF)]	= META_FUNC(int_sk_sendmsg_off),
 		[META_ID(SK_WRITE_PENDING)]	= META_FUNC(int_sk_write_pend),
+		[META_ID(VLAN_TAG)]		= META_FUNC(int_vlan_tag),
 	}
 };
 
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