patch-2.4.21 linux-2.4.21/include/linux/skbuff.h

• Lines: 44
• Date: 2003-06-13 07:51:39.000000000 -0700
• Orig file: linux-2.4.20/include/linux/skbuff.h
• Orig date: 2002-08-02 17:39:46.000000000 -0700

diff -urN linux-2.4.20/include/linux/skbuff.h linux-2.4.21/include/linux/skbuff.h
@@ -240,6 +240,7 @@
 						int newheadroom,
 						int newtailroom,
 						int priority);
+extern struct sk_buff *		skb_pad(struct sk_buff *skb, int pad);
 #define dev_kfree_skb(a)	kfree_skb(a)
 extern void	skb_over_panic(struct sk_buff *skb, int len, void *here);
 extern void	skb_under_panic(struct sk_buff *skb, int len, void *here);
@@ -751,7 +752,7 @@
 	return skb->data_len;
 }
 
-static inline int skb_headlen(const struct sk_buff *skb)
+static inline unsigned int skb_headlen(const struct sk_buff *skb)
 {
 	return skb->len - skb->data_len;
 }
@@ -1082,6 +1083,26 @@
 }
 
 /**
+ *	skb_padto	- pad an skbuff up to a minimal size
+ *	@skb: buffer to pad
+ *	@len: minimal length
+ *
+ *	Pads up a buffer to ensure the trailing bytes exist and are
+ *	blanked. If the buffer already contains sufficient data it
+ *	is untouched. Returns the buffer, which may be a replacement
+ *	for the original, or NULL for out of memory - in which case
+ *	the original buffer is still freed.
+ */
+ 
+static inline struct sk_buff *skb_padto(struct sk_buff *skb, unsigned int len)
+{
+	unsigned int size = skb->len;
+	if(likely(size >= len))
+		return skb;
+	return skb_pad(skb, len-size);
+}
+
+/**
  *	skb_linearize - convert paged skb to linear one
  *	@skb: buffer to linarize
  *	@gfp: allocation mode