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

Image

skb_trim()

Prototype

void skb_trim(struct sk_buff *skb, unsigned int len);

Description

remove end from a buffer

Image

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

Image

skb_dequeue_tail()

Prototype

struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list);

Description

remove from the tail of the queue

Image

skb_insert()

Prototype

void skb_insert(struct sk_buff *old, struct sk_buff *newsk);

Description

insert a buffer

Image

skb_append()

Prototype

void skb_append(struct sk_buff *old, struct sk_buff *newsk);

Description

append a buffer

Image

skb_unlink()Prototype  void skb_unlink(struct sk_buff *skb); Description  remove a buffer from a listImage