skbuff详解.docx

skbuff详解.docx

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skbuff详解

sk_buff数据结构图

一。

skbuff的结构图如下

二.Basicfunctionsforsk_buff

skb_headroom（）,skb_tailroom（）

Prototype/Description

intskb_headroom（conststructsk_buff*skb）;

bytesatbufferhead

intskb_tailroom（conststructsk_buff*skb）;

bytesatbuffer

Image

skb_reserve（）

Prototype

voidskb_reserve（structsk_buff*skb,unsignedintlen）;

Description

adjustheadroom

Image

skb_push（）

Prototype

unsignedchar*skb_push（structsk_buff*skb,unsignedintlen）;

Description

adddatatothestartofabuffer

Image

skb_pull（）

Prototype

unsignedchar*skb_pull（structsk_buff*skb,unsignedintlen）;

Description

removedatafromthestartofabuffer

Image

skb_put（）

Prototype

unsignedchar*skb_put（structsk_buff*skb,unsignedintlen）;

Description

adddatatoabuffer

Image

skb_trim（）

Prototype

voidskb_trim（structsk_buff*skb,unsignedintlen）;

Description

removeendfromabuffer

Image

三.Listofsk_buff

  Prototype/Description

__u32skb_queue_len（conststructsk_buff_head*list_）;

getqueuelength

structsk_buff*skb_peek（structsk_buff_head*list）;

getpointertotheheadelement

structsk_buff*skb_peek_tail（structsk_buff_head*list）;

getpointertothetailelement

Image

skb_queue_head（）

  Prototype

     voidskb_queue_head（structsk_buff_head*list,structsk_buff*newsk）;   

  Description

  queueabufferatthelisthead

 Image

skb_queue_tail（）

   Prototype

        voidskb_queue_tail（structsk_buff_head*list,structsk_buff*newsk）;

  Description

queueabufferatthelistta

  Image

skb_dequeue（）

Prototype

structsk_buff*skb_dequeue（structsk_buff_head*list）;

Description

removefromtheheadofthequeue

Image

skb_dequeue_tail（）

Prototype

structsk_buff*skb_dequeue_tail（structsk_buff_head*list）;

Description

removefromthetailofthequeue

Image

skb_insert（）

Prototype

voidskb_insert（structsk_buff*old,structsk_buff*newsk）;

Description

insertabuffer

Image

skb_append（）

Prototype

voidskb_append（structsk_buff*old,structsk_buff*newsk）;

Description

appendabuffer

Image

skb_unlink（）

Prototype

  voidskb_unlink（structsk_buff*skb）; Description

 removeabufferfromalist

Image