net: move pskb_put() to core code

This function has usage beside IPsec so move it to the core skbuff code.
While doing so, give it some documentation and change its return type to
'unsigned char *' to be in line with skb_put().

Signed-off-by: Mathias Krause <mathias.krause@secunet.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 23 insertions, 0 deletions

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 3735fad5616e..2fbea08c4f50 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1264,6 +1264,29 @@ free_skb:
 EXPORT_SYMBOL(skb_pad);
 
 /**
+ *      pskb_put - add data to the tail of a potentially fragmented buffer
+ *      @skb: start of the buffer to use
+ *      @tail: tail fragment of the buffer to use
+ *      @len: amount of data to add
+ *
+ *      This function extends the used data area of the potentially
+ *      fragmented buffer. @tail must be the last fragment of @skb -- or
+ *      @skb itself. If this would exceed the total buffer size the kernel
+ *      will panic. A pointer to the first byte of the extra data is
+ *      returned.
+ */
+
+unsigned char *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len)
+{
+        if (tail != skb) {
+                skb->data_len += len;
+                skb->len += len;
+        }
+        return skb_put(tail, len);
+}
+EXPORT_SYMBOL_GPL(pskb_put);
+
+/**
  *      skb_put - add data to a buffer
  *      @skb: buffer to use
  *      @len: amount of data to add