Subject: [PATCH net-next V15 2/3] Check for vlan ethernet types for 8021.q or 802.1ad

From: Thomas F Herbert <[email-masked]>
Date: Sat, 10 Oct 2015 19:40:32 -0400

Signed-off-by: Thomas F Herbert <[email-masked]>
---
 include/linux/if_vlan.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 67ce5bd..88d1be4 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -627,6 +627,23 @@ static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
 
 	return features;
 }
+/**
+ * eth_type_vlan - check for valid vlan ether type.
+ * @ethertype: ether type to check
+ *
+ * Returns true if the ether type is a vlan ether type.
+ */
+static inline bool eth_type_vlan(__be16 ethertype)
+{
+	switch (ethertype) {
+	case (htons(ETH_P_8021Q)):
+		return true;
+	case (htons(ETH_P_8021AD)):
+		return true;
+	default:
+		return false;
+	}
+}
 
 /**
  * compare_vlan_header - Compare two vlan headers
-- 
2.4.3