summaryrefslogtreecommitdiff
path: root/include/linux/if_vlan.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/if_vlan.h')
-rw-r--r--include/linux/if_vlan.h67
1 files changed, 67 insertions, 0 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index b11b28a30b9e..920e4457ce6e 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -561,4 +561,71 @@ static inline void vlan_set_encap_proto(struct sk_buff *skb,
skb->protocol = htons(ETH_P_802_2);
}
+/**
+ * skb_vlan_tagged - check if skb is vlan tagged.
+ * @skb: skbuff to query
+ *
+ * Returns true if the skb is tagged, regardless of whether it is hardware
+ * accelerated or not.
+ */
+static inline bool skb_vlan_tagged(const struct sk_buff *skb)
+{
+ if (!skb_vlan_tag_present(skb) &&
+ likely(skb->protocol != htons(ETH_P_8021Q) &&
+ skb->protocol != htons(ETH_P_8021AD)))
+ return false;
+
+ return true;
+}
+
+/**
+ * skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers.
+ * @skb: skbuff to query
+ *
+ * Returns true if the skb is tagged with multiple vlan headers, regardless
+ * of whether it is hardware accelerated or not.
+ */
+static inline bool skb_vlan_tagged_multi(const struct sk_buff *skb)
+{
+ __be16 protocol = skb->protocol;
+
+ if (!skb_vlan_tag_present(skb)) {
+ struct vlan_ethhdr *veh;
+
+ if (likely(protocol != htons(ETH_P_8021Q) &&
+ protocol != htons(ETH_P_8021AD)))
+ return false;
+
+ veh = (struct vlan_ethhdr *)skb->data;
+ protocol = veh->h_vlan_encapsulated_proto;
+ }
+
+ if (protocol != htons(ETH_P_8021Q) && protocol != htons(ETH_P_8021AD))
+ return false;
+
+ return true;
+}
+
+/**
+ * vlan_features_check - drop unsafe features for skb with multiple tags.
+ * @skb: skbuff to query
+ * @features: features to be checked
+ *
+ * Returns features without unsafe ones if the skb has multiple tags.
+ */
+static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
+ netdev_features_t features)
+{
+ if (skb_vlan_tagged_multi(skb))
+ features = netdev_intersect_features(features,
+ NETIF_F_SG |
+ NETIF_F_HIGHDMA |
+ NETIF_F_FRAGLIST |
+ NETIF_F_GEN_CSUM |
+ NETIF_F_HW_VLAN_CTAG_TX |
+ NETIF_F_HW_VLAN_STAG_TX);
+
+ return features;
+}
+
#endif /* !(_LINUX_IF_VLAN_H_) */