>>>>>> [...IP_RECVIF...if_index...]

I think it would be easy to make IP_RECVIF - or something similar,
cloned from it, IP_RECVIFNAME maybe - give you the interface name
instead of the number.  Of course, it will be variable-size; this may
complicate your userland code somewhat.  Want me to try?

>>> [panic upon experimenting with routing sockets]
>> I'm inclined to agree with you in this case.  But when you're
>> running as root, the "userland being able to panic the machine is
>> always a bug" dictum is no longer really valid; consider
>> dd if=/dev/zero of=/dev/mem.
> yes, but there's a vast difference between "if i do this, i intend to
> shoot myself in the foot" and "i will try this and expect the kernel
> to protect my foot" expectations.

Oh, certainly.  Just remarking that I have had a great deal of trouble
codifying that the line between "that's a bug" and "so don't do that".

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