Subject: [PATCH net-next V10 2/4] General check for vlan ethernet types

From: Thomas F Herbert <[email-masked]>
Date: Tue, 2 Jun 2015 13:50:42 -0400

This patch adds a function to check for vlan ethernet types. There is a
use case in openvswitch and it should be useful elsewhere.

Signed-off-by: Thomas F Herbert <[email-masked]>
---
 include/linux/if_vlan.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 920e445..3713454 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -627,5 +627,14 @@ static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
 
 	return features;
 }
+/**
+ * Check for legal valid vlan ether type.
+ */
+static inline bool eth_type_vlan(__be16 ethertype)
+{
+	if (ethertype == htons(ETH_P_8021Q) || ethertype == htons(ETH_P_8021AD))
+		return true;
+	return false;
+}
 
 #endif /* !(_LINUX_IF_VLAN_H_) */
-- 
2.1.0