# \[PATCH net-next V11 2/3\] Check for vlan ethernet types for 8021.q or 802.1ad

- From: Thomas F Herbert \<hidden\>
- Date: 2015-06-23 18:30:00 
- List: netdev
- Page: https://ratatoskr.run/netdev/2015/06/10990648
- Thread: https://ratatoskr.run/netdev/2015/06/10990646/t.md

```text
Signed-off-by: Thomas F Herbert <redacted>
---
 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
```