sk_buff数据结构图

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sk_buff数据结构图
一。skbuff的结构图如下


二.Basic functions for sk_buff
   
skb_headroom(), skb_tailroom()
Prototype / Description
int skb_headroom(const struct sk_buff *skb);
bytes at buffer head
int skb_tailroom(const struct sk_buff *skb);
bytes at buffer
Image


skb_reserve()
Prototype
void skb_reserve(struct sk_buff *skb, unsigned int len);
Description
adjust headroom
Image


skb_push()
Prototype
unsigned char *skb_push(struct sk_buff *skb, unsigned int len);
Description
add data to the start of a buffer
Image


skb_pull()
Prototype
unsigned char *skb_pull(struct sk_buff *skb, unsigned int len);
Description
remove data from the start of a buffer
Image


skb_put()
Prototype
unsigned char *skb_put(struct sk_buff *skb, unsigned int len);
Description
add data to a buffer
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skb_trim()
Prototype
void skb_trim(struct sk_buff *skb, unsigned int len);
Description
remove end from a buffer
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三.List of sk_buff
   Prototype / Description
__u32 skb_queue_len(const struct sk_buff_head *list_);
get queue length
struct sk_buff *skb_peek(struct sk_buff_head *list);
get pointer to the head element
struct sk_buff *skb_peek_tail(struct sk_buff_head *list);
get pointer to the tail element
Image



skb_queue_head()
   Prototype
     void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk);   
  Description
   queue a buffer at the list head
  Image


skb_queue_tail()
    Prototype
        void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk);
   Description
queue a buffer at the list ta
   Image


skb_dequeue()
Prototype
struct sk_buff *skb_dequeue(struct sk_buff_head *list);
Description
remove from the head of the queue
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skb_dequeue_tail()
Prototype
struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list);
Description
remove from the tail of the queue
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skb_insert()
Prototype
void skb_insert(struct sk_buff *old, struct sk_buff *newsk);
Description
insert a buffer
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skb_append()
Prototype
void skb_append(struct sk_buff *old, struct sk_buff *newsk);
Description
append a buffer
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skb_unlink()
Prototype
  void skb_unlink(struct sk_buff *skb); Description
  remove a buffer from a list
Image




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