Trying to start netfilter hacking with no previous unix coding ex perience. (HELP!)

[Ryan Hoegg]

Hi all,

This will seem extraordinarily elementary to many of you, but I need to
accelerate a lot to merge onto this highway.  I'm having a lot of trouble
getting off the on-ramp, and the cars behind me are starting to honk.

I assume that within netfilter, after a packet is handed to us we have
decompiled it and assigned several parts of it (header, maybe parts of the
header, data field, rcv port, dst port, rcv ip, dst ip, etc etc etc) to a
internal data structure which we can read and manipulate.  Is this the
"skb"?  If not, what is it, and what is the skb?  If it is the skb, where do
I find the definition of the skb?

Please reply privately unless the responses are pertinent to the whole list.

Thanks,
--ryan