> Who is to say it is unused?
It is not used not depending of anyone's desire, but just because
it is not well-defined. See below.
Actually, I am even a bit puzzled for what purpose you were intented
to use this pointer 8)8). I cannot even formulate a valid goal.
> Because someone might try to use it, assuming that if it is not zero,
This pointer cannot be zero, it is relocateable and always
points to a valid memory area.
> > This is pointer for packet sniffer marking start of raw
> > data. Outside of this context it is just not well defined.
>
> Right, and *outgoing* packets get caught by the packet sniffers too...
Exactly. And it is the most weird bug following us from ancient times.
Look at code and in comments in it.
Summarizing: mac.raw is trick to pass mac header from driver
to packet socket. That's all.
Alexey Kuznetsov
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