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net: move pskb_put() to core code

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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>
This commit is contained in:
Mathias Krause 2013-11-07 14:18:24 +01:00 committed by David S. Miller
parent b5ad795e52
commit 0c7ddf36c2
4 changed files with 24 additions and 15 deletions
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1
include/linux/skbuff.h
View File

@ -1417,6 +1417,7 @@ static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
/* /*
* Add data to an sk_buff * Add data to an sk_buff
*/ */
unsigned char *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
unsigned char *skb_put(struct sk_buff *skb, unsigned int len); unsigned char *skb_put(struct sk_buff *skb, unsigned int len);
static inline unsigned char *__skb_put(struct sk_buff *skb, unsigned int len) static inline unsigned char *__skb_put(struct sk_buff *skb, unsigned int len)
{ {

2
include/net/esp.h
View File

@ -3,8 +3,6 @@
#include <linux/skbuff.h> #include <linux/skbuff.h>
void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len);
struct ip_esp_hdr; struct ip_esp_hdr;
static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb) static inline struct ip_esp_hdr *ip_esp_hdr(const struct sk_buff *skb)

23
net/core/skbuff.c
View File

@ -1263,6 +1263,29 @@ int skb_pad(struct sk_buff *skb, int pad)
} }
EXPORT_SYMBOL(skb_pad); 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_put - add data to a buffer
* @skb: buffer to use * @skb: buffer to use

13
net/xfrm/xfrm_algo.c
View File

@ -802,17 +802,4 @@ int xfrm_count_pfkey_enc_supported(void)
} }
EXPORT_SYMBOL_GPL(xfrm_count_pfkey_enc_supported); EXPORT_SYMBOL_GPL(xfrm_count_pfkey_enc_supported);
#if defined(CONFIG_INET_ESP) || defined(CONFIG_INET_ESP_MODULE) || defined(CONFIG_INET6_ESP) || defined(CONFIG_INET6_ESP_MODULE)
void *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);
#endif
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");