1 files changed, 33 insertions, 0 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index a01b6f84e3bc..acf17af45af9 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -493,6 +493,19 @@ static inline bool skb_queue_is_last(const struct sk_buff_head *list,
 }
 
 /**
+ *      skb_queue_is_first - check if skb is the first entry in the queue
+ *      @list: queue head
+ *      @skb: buffer
+ *
+ *      Returns true if @skb is the first buffer on the list.
+ */
+static inline bool skb_queue_is_first(const struct sk_buff_head *list,
+                                      const struct sk_buff *skb)
+{
+        return (skb->prev == (struct sk_buff *) list);
+}
+
+/**
  *      skb_queue_next - return the next packet in the queue
  *      @list: queue head
  *      @skb: current buffer
@@ -511,6 +524,24 @@ static inline struct sk_buff *skb_queue_next(const struct sk_buff_head *list,
 }
 
 /**
+ *      skb_queue_prev - return the prev packet in the queue
+ *      @list: queue head
+ *      @skb: current buffer
+ *
+ *      Return the prev packet in @list before @skb.  It is only valid to
+ *      call this if skb_queue_is_first() evaluates to false.
+ */
+static inline struct sk_buff *skb_queue_prev(const struct sk_buff_head *list,
+                                             const struct sk_buff *skb)
+{
+        /* This BUG_ON may seem severe, but if we just return then we
+         * are going to dereference garbage.
+         */
+        BUG_ON(skb_queue_is_first(list, skb));
+        return skb->prev;
+}
+
+/**
  *      skb_get - reference buffer
  *      @skb: buffer to reference
  *
@@ -1652,6 +1683,8 @@ extern int             skb_splice_bits(struct sk_buff *skb,
 extern void            skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to);
 extern void            skb_split(struct sk_buff *skb,
                                  struct sk_buff *skb1, const u32 len);
+extern int             skb_shift(struct sk_buff *tgt, struct sk_buff *skb,
+                                 int shiftlen);
 
 extern struct sk_buff *skb_segment(struct sk_buff *skb, int features);