1 files changed, 94 insertions, 1 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f2af494330ab..320e976d5ab8 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -376,6 +376,8 @@ typedef unsigned char *sk_buff_data_t;
  *      @mark: Generic packet mark
  *      @dropcount: total number of sk_receive_queue overflows
  *      @vlan_tci: vlan tag control information
+ *      @inner_transport_header: Inner transport layer header (encapsulation)
+ *      @inner_network_header: Network layer header (encapsulation)
  *      @transport_header: Transport layer header
  *      @network_header: Network layer header
  *      @mac_header: Link layer header
@@ -471,7 +473,13 @@ struct sk_buff {
         __u8                    wifi_acked:1;
         __u8                    no_fcs:1;
         __u8                    head_frag:1;
-        /* 8/10 bit hole (depending on ndisc_nodetype presence) */
+        /* Encapsulation protocol and NIC drivers should use
+         * this flag to indicate to each other if the skb contains
+         * encapsulated packet or not and maybe use the inner packet
+         * headers if needed
+         */
+        __u8                    encapsulation:1;
+        /* 7/9 bit hole (depending on ndisc_nodetype presence) */
         kmemcheck_bitfield_end(flags2);
 
 #ifdef CONFIG_NET_DMA
@@ -486,6 +494,8 @@ struct sk_buff {
                 __u32           avail_size;
         };
 
+        sk_buff_data_t          inner_transport_header;
+        sk_buff_data_t          inner_network_header;
         sk_buff_data_t          transport_header;
         sk_buff_data_t          network_header;
         sk_buff_data_t          mac_header;
@@ -1435,12 +1445,53 @@ static inline void skb_reserve(struct sk_buff *skb, int len)
         skb->tail += len;
 }
 
+static inline void skb_reset_inner_headers(struct sk_buff *skb)
+{
+        skb->inner_network_header = skb->network_header;
+        skb->inner_transport_header = skb->transport_header;
+}
+
 static inline void skb_reset_mac_len(struct sk_buff *skb)
 {
         skb->mac_len = skb->network_header - skb->mac_header;
 }
 
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
+static inline unsigned char *skb_inner_transport_header(const struct sk_buff
+                                                        *skb)
+{
+        return skb->head + skb->inner_transport_header;
+}
+
+static inline void skb_reset_inner_transport_header(struct sk_buff *skb)
+{
+        skb->inner_transport_header = skb->data - skb->head;
+}
+
+static inline void skb_set_inner_transport_header(struct sk_buff *skb,
+                                                   const int offset)
+{
+        skb_reset_inner_transport_header(skb);
+        skb->inner_transport_header += offset;
+}
+
+static inline unsigned char *skb_inner_network_header(const struct sk_buff *skb)
+{
+        return skb->head + skb->inner_network_header;
+}
+
+static inline void skb_reset_inner_network_header(struct sk_buff *skb)
+{
+        skb->inner_network_header = skb->data - skb->head;
+}
+
+static inline void skb_set_inner_network_header(struct sk_buff *skb,
+                                                const int offset)
+{
+        skb_reset_inner_network_header(skb);
+        skb->inner_network_header += offset;
+}
+
 static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
 {
         return skb->head + skb->transport_header;
@@ -1496,6 +1547,38 @@ static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
 }
 
 #else /* NET_SKBUFF_DATA_USES_OFFSET */
+static inline unsigned char *skb_inner_transport_header(const struct sk_buff
+                                                        *skb)
+{
+        return skb->inner_transport_header;
+}
+
+static inline void skb_reset_inner_transport_header(struct sk_buff *skb)
+{
+        skb->inner_transport_header = skb->data;
+}
+
+static inline void skb_set_inner_transport_header(struct sk_buff *skb,
+                                                   const int offset)
+{
+        skb->inner_transport_header = skb->data + offset;
+}
+
+static inline unsigned char *skb_inner_network_header(const struct sk_buff *skb)
+{
+        return skb->inner_network_header;
+}
+
+static inline void skb_reset_inner_network_header(struct sk_buff *skb)
+{
+        skb->inner_network_header = skb->data;
+}
+
+static inline void skb_set_inner_network_header(struct sk_buff *skb,
+                                                const int offset)
+{
+        skb->inner_network_header = skb->data + offset;
+}
 
 static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
 {
@@ -1574,11 +1657,21 @@ static inline u32 skb_network_header_len(const struct sk_buff *skb)
         return skb->transport_header - skb->network_header;
 }
 
+static inline u32 skb_inner_network_header_len(const struct sk_buff *skb)
+{
+        return skb->inner_transport_header - skb->inner_network_header;
+}
+
 static inline int skb_network_offset(const struct sk_buff *skb)
 {
         return skb_network_header(skb) - skb->data;
 }
 
+static inline int skb_inner_network_offset(const struct sk_buff *skb)
+{
+        return skb_inner_network_header(skb) - skb->data;
+}
+
 static inline int pskb_network_may_pull(struct sk_buff *skb, unsigned int len)
 {
         return pskb_may_pull(skb, skb_network_offset(skb) + len);