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Re: if_flags

>>> How much of a pain would it be to grow [ifnet.if_flags]?
> I don't think that there is a binary compatibility issue since ifnet
> is not used in ioctls from what I can see.

Strictly, true, but this is not for internal flags but for flags
userland needs to be able to manipulate, which means that it really
applies not just to if_flags but other places that carry IFF_* flags,
such as ifreq.ifr_flags.  Done simplistically, it would indeed be an
ABI change.

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