Subject: Re: if_detach handling styles
To: None <firstname.lastname@example.org>
From: Jason Thorpe <email@example.com>
Date: 02/02/2000 08:58:30
On Thu, 03 Feb 2000 01:40:15 +0900
> I'm a bit confused. When I emailed about bsdi-wildboar/freebsd-PAO/
> netbsd pcmcia models, someone told me that "interface and routes goes
> away, daemons and programs should live with it" is the right thing
> to do. "Retainning routes even if interface is not there" is not
> consistent with it...
right, the interface is gone... who's to say you're even going to pop
it back in?
Now, regarding the inp_route thing... yah, it should probably be purged
when the ifaddr is purged. The same goes for when you delete an interface
address with SIOCDIFADDR that's being used by a cached route, which has
added a reference count to the route, I belive:
dr-evil:thorpej 126$ netstat -r
Destination Gateway Flags Refs Use Mtu Interface
default w001.z209220028.sj UGS 9 29315 1500 kue0
localhost localhost UH 4 413 32976 lo0
209.220.28/28 link#10 UC 0 0 1500 kue0
w001.z209220028.sj 00:20:6f:04:13:1d UHL 1 1 1500 kue0
w002.z209220028.sj localhost UGHS 0 0 32976 lo0
The refs on my default route ought to be from those cached inp_route's.
Now, when if_down(ifp) happens in if_detach(), protocols should deal
with that, finding another route, etc, right? What about if I forcibly
deleted the default route? The protocol would deal, right?
So, it's probably not a problem at the moment...
-- Jason R. Thorpe <firstname.lastname@example.org>