regarding about sk_buff ....

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Hi guys,
I am quite confused by the sk_buff's head, data and tail room concept.
Let's say I have an IPv6 packet with a filled msghdr which carries 2
iovec structures. How would the skbuff looks like?

Which part of the packet corresponds to:
- ethernet header
- ipv6 header
- msghdr
- iovec
- other parts of skbuff

Many thanks in advance!

Cheers,
Jonathan

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