Commit e0053ec0 authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

[SKBUFF]: Add skb_morph 



This patch creates a new function skb_morph that's just like skb_clone
except that it lets user provide the spare skb that will be overwritten
by the one that's to be cloned.

This will be used by IP fragment reassembly so that we get back the same
skb that went in last (rather than the head skb that we get now which
requires us to carry around double pointers all over the place).

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent dec18810

include/linux/skbuff.h

+1 −0
Original line number Diff line number Diff line
@@ -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,

net/core/skbuff.c

+53 −30
Original line number Diff line number Diff line
@@ -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)

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