Messages in this thread |  | | From | "Seong Moon" <> | Subject | sk_buff for frame fragmentation and reassembly | Date | Wed, 28 Aug 2002 10:42:50 +0900 |
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Hi,there.
I'm writing virtual network device driver. I want to write the function of fragmentation and reassembly of a frame which is larger than physical MTU.
So, I've looked into the ip_fragment() and ip_defrag() and sk_buff.h . But I couldn't understand the process of fragmentation and reassembly of datagram.
My questions are as follows :
<fragmentation> - ip_fragment() uses alloc_skb() and skb_copy_bit(), Is the original sk_buff shared ? or Is another sk_buff created? I want to know the meaning of alloc_skb() and skb_copy_bit().
<reassembly> - ip_defrag() uses skb_shinfo(skb)->frag_list. When I pass a reassembled frame to network layer, can I use skb_shinfo(skb)->frag_list ? If not, How can I pass the reassembled frame to upper layer?
<sk_buff> what does the usage of pskb_pull() and pskb_trim()?
Thanks in advance.
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