using skbuff in kernel module

[cranium2003]

Hello,
         I want to add new header between IP and
ETHERNET layer. I want to ask can it be done using
netfilter hooks? 
         Can skb functions (skb_reserve, skb_push
,skb_pull)be allowed to use in kernel module so that i
can add at NF_IP_LOCAL_OUT and pull my own header at
NF_IP_LOCAL_IN?

regards,
cranium


		
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