IFNAMSIZ/IF_NAMESIZE change proposal

[Julian Elischer]

On 9/16/13 1:23 PM, Julian Elischer wrote:
> On 9/15/13 12:21 AM, Warner Losh wrote:
>> On Sep 14, 2013, at 2:44 AM, Anuranjan Shukla wrote:
>>> At Juniper Networks, interface name size was needed to be longer 
>>> than what FreeBSD has. We're trying to reduce our local changes to 
>>> FreeBSD to allow us an easier time upgrading to newer FreeBSD 
>>> releases, and support the modularization of the network stack we'd 
>>> proposed earlier. I'm sending this  out to propose changing 
>>> IFNAMSIZ from 16 to 60 (this is the size we use) in FreeBSD. We 
>>> don't see any downside (other than increasing the ifreq structure 
>>> size for one) to doing this, as allowing longer interface names 
>>> can be handy for vendors. I'd like to hear if there's a strong 
>>> objection to this. If not, we'd like to get this into to the 
>>> FreeBSD codebase. Any thoughts/objections highly appreciated.
>
> Divert already has a problem with 16, since it tries (or fails if > 
> 8 ) to pack the interface name into the 'unused'
> bytes of a sockaddr.
> 60 just makes things worse, but since it already fails at 16 I can't 
> really object.
> but it would be nice if we could think of a better mechanism for 
> divert reinjection.
having said that I guess divert could just define a different 
sockaddr_divert
to use instead, sinc eit is a different family.
>
>> 56 or 64 would be better for alignment, wouldn't it?
>>
>> Warner
>>
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