1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 33370271b8b2..70a3f8d49118 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -481,6 +481,7 @@ struct sk_buff {
         union {
                 __u32           mark;
                 __u32           dropcount;
+                __u32           avail_size;
         };
 
         sk_buff_data_t          transport_header;
@@ -1366,6 +1367,18 @@ static inline int skb_tailroom(const struct sk_buff *skb)
 }
 
 /**
+ *      skb_availroom - bytes at buffer end
+ *      @skb: buffer to check
+ *
+ *      Return the number of bytes of free space at the tail of an sk_buff
+ *      allocated by sk_stream_alloc()
+ */
+static inline int skb_availroom(const struct sk_buff *skb)
+{
+        return skb_is_nonlinear(skb) ? 0 : skb->avail_size - skb->len;
+}
+
+/**
  *      skb_reserve - adjust headroom
  *      @skb: buffer to alter
  *      @len: bytes to move