diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/skbuff.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index f94999dcfb1c..e364ce6c003c 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -287,6 +287,7 @@ extern struct sk_buff *skb_realloc_headroom(struct sk_buff *skb, extern struct sk_buff *skb_copy_expand(const struct sk_buff *skb, 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); @@ -1088,6 +1089,26 @@ static inline int skb_cow(struct sk_buff *skb, unsigned int headroom) } /** + * 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 + skb->data_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 |