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Diffstat (limited to 'include/linux/if_vlan.h')
-rw-r--r--include/linux/if_vlan.h74
1 files changed, 53 insertions, 21 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 515a35e2a48a..b11b28a30b9e 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -78,9 +78,9 @@ static inline bool is_vlan_dev(struct net_device *dev)
return dev->priv_flags & IFF_802_1Q_VLAN;
}
-#define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
-#define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
-#define vlan_tx_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)
+#define skb_vlan_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
+#define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
+#define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)
/**
* struct vlan_pcpu_stats - VLAN percpu rx/tx stats
@@ -376,7 +376,7 @@ static inline struct sk_buff *vlan_insert_tag_set_proto(struct sk_buff *skb,
static inline struct sk_buff *__vlan_hwaccel_push_inside(struct sk_buff *skb)
{
skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
- vlan_tx_tag_get(skb));
+ skb_vlan_tag_get(skb));
if (likely(skb))
skb->vlan_tci = 0;
return skb;
@@ -393,7 +393,7 @@ static inline struct sk_buff *__vlan_hwaccel_push_inside(struct sk_buff *skb)
*/
static inline struct sk_buff *vlan_hwaccel_push_inside(struct sk_buff *skb)
{
- if (vlan_tx_tag_present(skb))
+ if (skb_vlan_tag_present(skb))
skb = __vlan_hwaccel_push_inside(skb);
return skb;
}
@@ -442,8 +442,8 @@ static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
u16 *vlan_tci)
{
- if (vlan_tx_tag_present(skb)) {
- *vlan_tci = vlan_tx_tag_get(skb);
+ if (skb_vlan_tag_present(skb)) {
+ *vlan_tci = skb_vlan_tag_get(skb);
return 0;
} else {
*vlan_tci = 0;
@@ -472,27 +472,59 @@ static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
/**
* vlan_get_protocol - get protocol EtherType.
* @skb: skbuff to query
+ * @type: first vlan protocol
+ * @depth: buffer to store length of eth and vlan tags in bytes
*
* Returns the EtherType of the packet, regardless of whether it is
* vlan encapsulated (normal or hardware accelerated) or not.
*/
-static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
+static inline __be16 __vlan_get_protocol(struct sk_buff *skb, __be16 type,
+ int *depth)
{
- __be16 protocol = 0;
-
- if (vlan_tx_tag_present(skb) ||
- skb->protocol != cpu_to_be16(ETH_P_8021Q))
- protocol = skb->protocol;
- else {
- __be16 proto, *protop;
- protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
- h_vlan_encapsulated_proto),
- sizeof(proto), &proto);
- if (likely(protop))
- protocol = *protop;
+ unsigned int vlan_depth = skb->mac_len;
+
+ /* if type is 802.1Q/AD then the header should already be
+ * present at mac_len - VLAN_HLEN (if mac_len > 0), or at
+ * ETH_HLEN otherwise
+ */
+ if (type == htons(ETH_P_8021Q) || type == htons(ETH_P_8021AD)) {
+ if (vlan_depth) {
+ if (WARN_ON(vlan_depth < VLAN_HLEN))
+ return 0;
+ vlan_depth -= VLAN_HLEN;
+ } else {
+ vlan_depth = ETH_HLEN;
+ }
+ do {
+ struct vlan_hdr *vh;
+
+ if (unlikely(!pskb_may_pull(skb,
+ vlan_depth + VLAN_HLEN)))
+ return 0;
+
+ vh = (struct vlan_hdr *)(skb->data + vlan_depth);
+ type = vh->h_vlan_encapsulated_proto;
+ vlan_depth += VLAN_HLEN;
+ } while (type == htons(ETH_P_8021Q) ||
+ type == htons(ETH_P_8021AD));
}
- return protocol;
+ if (depth)
+ *depth = vlan_depth;
+
+ return type;
+}
+
+/**
+ * vlan_get_protocol - get protocol EtherType.
+ * @skb: skbuff to query
+ *
+ * Returns the EtherType of the packet, regardless of whether it is
+ * vlan encapsulated (normal or hardware accelerated) or not.
+ */
+static inline __be16 vlan_get_protocol(struct sk_buff *skb)
+{
+ return __vlan_get_protocol(skb, skb->protocol, NULL);
}
static inline void vlan_set_encap_proto(struct sk_buff *skb,