[Q.] Insertion of new header into network protocol stack...

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How do you do?

What functions are required to insert new header into sk_buff as the following?
i.e.,
        original IP datagram:
                +--------+---------------------+------+
                | IP hdr | Transport Layer hdr | data |
                +--------+---------------------+------+
        modified IP datagram (after insertion of new header):
                +--------+---------+---------------------+------+
                | IP hdr | new hdr | Transport Layer hdr | data |
                +--------+---------+---------------------+------+

I think, some sk_buff data handling pointer manipulation functions are needed for this work, right?
Such as skb_push(), skb_reserve()...
But I don't know how to use these sk_buff handling functions exactly, and in what fashion...

Do you teach me?
Thank you for all your being...

-- 
| blusjune@nirva | ^_^ | stoneroses |
  Blusjune Jung
  Email: blusjune@yahoo.com
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