skb: Add skb_peek_next helper

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 0 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f3cf43de3c2a..c11a44ea1bf4 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -877,6 +877,24 @@ static inline struct sk_buff *skb_peek(const struct sk_buff_head *list_)
 }
 
 /**
+ *      skb_peek_next - peek skb following the given one from a queue
+ *      @skb: skb to start from
+ *      @list_: list to peek at
+ *
+ *      Returns %NULL when the end of the list is met or a pointer to the
+ *      next element. The reference count is not incremented and the
+ *      reference is therefore volatile. Use with caution.
+ */
+static inline struct sk_buff *skb_peek_next(struct sk_buff *skb,
+                const struct sk_buff_head *list_)
+{
+        struct sk_buff *next = skb->next;
+        if (next == (struct sk_buff *)list_)
+                next = NULL;
+        return next;
+}
+
+/**
  *      skb_peek_tail - peek at the tail of an &sk_buff_head
  *      @list_: list to peek at
  *