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-rw-r--r--include/linux/if_vlan.h79
1 files changed, 67 insertions, 12 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 5e6a2d4dc366..7d30892da064 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -300,32 +300,47 @@ static inline bool vlan_hw_offload_capable(netdev_features_t features,
}
/**
- * __vlan_insert_tag - regular VLAN tag inserting
+ * __vlan_insert_inner_tag - inner VLAN tag inserting
* @skb: skbuff to tag
* @vlan_proto: VLAN encapsulation protocol
* @vlan_tci: VLAN TCI to insert
+ * @mac_len: MAC header length including outer vlan headers
*
- * Inserts the VLAN tag into @skb as part of the payload
+ * Inserts the VLAN tag into @skb as part of the payload at offset mac_len
* Returns error if skb_cow_head failes.
*
* Does not change skb->protocol so this function can be used during receive.
*/
-static inline int __vlan_insert_tag(struct sk_buff *skb,
- __be16 vlan_proto, u16 vlan_tci)
+static inline int __vlan_insert_inner_tag(struct sk_buff *skb,
+ __be16 vlan_proto, u16 vlan_tci,
+ unsigned int mac_len)
{
struct vlan_ethhdr *veth;
if (skb_cow_head(skb, VLAN_HLEN) < 0)
return -ENOMEM;
- veth = skb_push(skb, VLAN_HLEN);
+ skb_push(skb, VLAN_HLEN);
- /* Move the mac addresses to the beginning of the new header. */
- memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
+ /* Move the mac header sans proto to the beginning of the new header. */
+ if (likely(mac_len > ETH_TLEN))
+ memmove(skb->data, skb->data + VLAN_HLEN, mac_len - ETH_TLEN);
skb->mac_header -= VLAN_HLEN;
+ veth = (struct vlan_ethhdr *)(skb->data + mac_len - ETH_HLEN);
+
/* first, the ethernet type */
- veth->h_vlan_proto = vlan_proto;
+ if (likely(mac_len >= ETH_TLEN)) {
+ /* h_vlan_encapsulated_proto should already be populated, and
+ * skb->data has space for h_vlan_proto
+ */
+ veth->h_vlan_proto = vlan_proto;
+ } else {
+ /* h_vlan_encapsulated_proto should not be populated, and
+ * skb->data has no space for h_vlan_proto
+ */
+ veth->h_vlan_encapsulated_proto = skb->protocol;
+ }
/* now, the TCI */
veth->h_vlan_TCI = htons(vlan_tci);
@@ -334,12 +349,30 @@ static inline int __vlan_insert_tag(struct sk_buff *skb,
}
/**
- * vlan_insert_tag - regular VLAN tag inserting
+ * __vlan_insert_tag - regular VLAN tag inserting
* @skb: skbuff to tag
* @vlan_proto: VLAN encapsulation protocol
* @vlan_tci: VLAN TCI to insert
*
* Inserts the VLAN tag into @skb as part of the payload
+ * Returns error if skb_cow_head failes.
+ *
+ * Does not change skb->protocol so this function can be used during receive.
+ */
+static inline int __vlan_insert_tag(struct sk_buff *skb,
+ __be16 vlan_proto, u16 vlan_tci)
+{
+ return __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN);
+}
+
+/**
+ * vlan_insert_inner_tag - inner VLAN tag inserting
+ * @skb: skbuff to tag
+ * @vlan_proto: VLAN encapsulation protocol
+ * @vlan_tci: VLAN TCI to insert
+ * @mac_len: MAC header length including outer vlan headers
+ *
+ * Inserts the VLAN tag into @skb as part of the payload at offset mac_len
* Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
*
* Following the skb_unshare() example, in case of error, the calling function
@@ -347,12 +380,14 @@ static inline int __vlan_insert_tag(struct sk_buff *skb,
*
* Does not change skb->protocol so this function can be used during receive.
*/
-static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
- __be16 vlan_proto, u16 vlan_tci)
+static inline struct sk_buff *vlan_insert_inner_tag(struct sk_buff *skb,
+ __be16 vlan_proto,
+ u16 vlan_tci,
+ unsigned int mac_len)
{
int err;
- err = __vlan_insert_tag(skb, vlan_proto, vlan_tci);
+ err = __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, mac_len);
if (err) {
dev_kfree_skb_any(skb);
return NULL;
@@ -361,6 +396,26 @@ static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
}
/**
+ * vlan_insert_tag - regular VLAN tag inserting
+ * @skb: skbuff to tag
+ * @vlan_proto: VLAN encapsulation protocol
+ * @vlan_tci: VLAN TCI to insert
+ *
+ * Inserts the VLAN tag into @skb as part of the payload
+ * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
+ *
+ * Following the skb_unshare() example, in case of error, the calling function
+ * doesn't have to worry about freeing the original skb.
+ *
+ * Does not change skb->protocol so this function can be used during receive.
+ */
+static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
+ __be16 vlan_proto, u16 vlan_tci)
+{
+ return vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN);
+}
+
+/**
* vlan_insert_tag_set_proto - regular VLAN tag inserting
* @skb: skbuff to tag
* @vlan_proto: VLAN encapsulation protocol