diff options
| -rw-r--r-- | include/linux/skbuff.h | 1 | ||||
| -rw-r--r-- | net/core/skbuff.c | 83 |
2 files changed, 54 insertions, 30 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index a656cecd373c..be5bf0b41513 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -357,6 +357,7 @@ static inline struct sk_buff *alloc_skb_fclone(unsigned int size, } extern void kfree_skbmem(struct sk_buff *skb); +extern struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src); extern struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t priority); extern struct sk_buff *skb_copy(const struct sk_buff *skb, diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 758bbef506d3..c3aa68ceed62 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -400,37 +400,8 @@ static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old) skb_copy_secmark(new, old); } -/** - * skb_clone - duplicate an sk_buff - * @skb: buffer to clone - * @gfp_mask: allocation priority - * - * Duplicate an &sk_buff. The new one is not owned by a socket. Both - * copies share the same packet data but not structure. The new - * buffer has a reference count of 1. If the allocation fails the - * function returns %NULL otherwise the new buffer is returned. - * - * If this function is called from an interrupt gfp_mask() must be - * %GFP_ATOMIC. - */ - -struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask) +static struct sk_buff *__skb_clone(struct sk_buff *n, struct sk_buff *skb) { - struct sk_buff *n; - - n = skb + 1; - if (skb->fclone == SKB_FCLONE_ORIG && - n->fclone == SKB_FCLONE_UNAVAILABLE) { - atomic_t *fclone_ref = (atomic_t *) (n + 1); - n->fclone = SKB_FCLONE_CLONE; - atomic_inc(fclone_ref); - } else { - n = kmem_cache_alloc(skbuff_head_cache, gfp_mask); - if (!n) - return NULL; - n->fclone = SKB_FCLONE_UNAVAILABLE; - } - #define C(x) n->x = skb->x n->next = n->prev = NULL; @@ -462,6 +433,58 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask) skb->cloned = 1; return n; +#undef C +} + +/** + * skb_morph - morph one skb into another + * @dst: the skb to receive the contents + * @src: the skb to supply the contents + * + * This is identical to skb_clone except that the target skb is + * supplied by the user. + * + * The target skb is returned upon exit. + */ +struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src) +{ + skb_release_data(dst); + return __skb_clone(dst, src); +} +EXPORT_SYMBOL_GPL(skb_morph); + +/** + * skb_clone - duplicate an sk_buff + * @skb: buffer to clone + * @gfp_mask: allocation priority + * + * Duplicate an &sk_buff. The new one is not owned by a socket. Both + * copies share the same packet data but not structure. The new + * buffer has a reference count of 1. If the allocation fails the + * function returns %NULL otherwise the new buffer is returned. + * + * If this function is called from an interrupt gfp_mask() must be + * %GFP_ATOMIC. + */ + +struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask) +{ + struct sk_buff *n; + + n = skb + 1; + if (skb->fclone == SKB_FCLONE_ORIG && + n->fclone == SKB_FCLONE_UNAVAILABLE) { + atomic_t *fclone_ref = (atomic_t *) (n + 1); + n->fclone = SKB_FCLONE_CLONE; + atomic_inc(fclone_ref); + } else { + n = kmem_cache_alloc(skbuff_head_cache, gfp_mask); + if (!n) + return NULL; + n->fclone = SKB_FCLONE_UNAVAILABLE; + } + + return __skb_clone(n, skb); } static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old) |