question about skbuff

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Hi,
  Is there anyone familiar with the sk_buff implementation in kernel
  2.4.19? 
 
 I have couple of questions about sk_buff.
  1) what does data_len mean? any difference from sk_buff->len
  It seems that data_len field doesn't exist in 2.2.22, but exists in
  2.4.18. I would suppose it relates to skb_shared_info, which doesn't
  exist in 2.2.22 either.
  
  2) skb_shared_info has member frags and flag_list, what's the
  relationship 
  between them? 

  I just can't any comments in the source code. thanks

  rz
  
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