ifconfig question

[Brooks Davis]

On Fri, Oct 01, 2004 at 03:32:34PM -0400, Wesley Shields wrote:
> Per a message about a month ago[1] I recently started some work on
> adding a -v flag to ifconfig.  I've been able to get the index number
> and epoch as those are exposed to userland, but both the dname and dunit
> are in an ifnet struct which AFAIK is not visible.  I initially thought
> you might be able to get them through an ioctl but that is not the case.
> 
> Unless I'm mistaken I'd have to either move the parts I would like to
> see to the if_data struct (which is visible through a sysctl()), or make
> them visible through an ioctl.
> 
> Am I correct in thinking that these are the only way to go about this
> problem, and if so which way is the best way?
> 
> If neither of them are a wanted solution then any suggestions you have
> would be helpful, otherwise I guess I'm just barking up the wrong tree
> here.  :)

A pair of new per-interface sysctls is the right answer.  Those members
are't really intened to be used by public interfaces and if_data can not
grow in -current until at least the 5.4 release and never can grow in
5.x.  An ioctl could work, but a sysctls are a bit cheaper to add.

-- Brooks

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