netdev - Re: ipv6: Should inet6_addr_del consider IFA_F

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Date:	Wed, 9 Apr 2014 22:36:11 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Heiner Kallweit <heiner.kallweit@....de>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: ipv6: Should inet6_addr_del consider IFA_F_MANAGETEMPADDR?

On Wed, Apr 09, 2014 at 09:38:27PM +0200, Heiner Kallweit wrote:
> Am 08.04.2014 22:14, schrieb Hannes Frederic Sowa:
> > [cc Jiri + Thomas]
> >
> > Hi!
> >
> > On Tue, Apr 08, 2014 at 08:26:37PM +0200, Heiner Kallweit wrote:
> >> I stumbled accross the fact that inet6_addr_add as well as inet6_addr_modify
> >> consider IFA_F_TEMPORARY whilst inet6_addr_del does not.
> >>
> >> My understanding of IFA_F_MANAGETEMPADDR is that it allows userspace applications
> >> to deal with temporary addresses w/o having to create / track (and possibly delete)
> >> each and every temporary address.
> >>
> >> This works fine when creating / modifying a global address. However when a
> >> global address is deleted the orphaned temporary addresses remain.
> >> Shouldn't the userspace be able to set IFA_F_MANAGETEMPADDR also for RTM_DELADDR
> >> to signalize that the kernel should delete all related temporary addresses as well?
> > Sure, that is possible. I guess it was not done already because
> > inet6_addr_del did not handle IFA_FLAGS at all. But it should be a very
> > tiny change to pass that flag down. Please submit an iproute patch along
> > with your changes.
> After a brief look at the source code of iproute2 it seems like "ip addr del" already supports sending
> IFA_F_MANAGETEMPADDR with RTM_DELADDR, though I have the impression it's unintentional.
> 
> The del command internally calls ipaddr_modify just like add / change / replace.
> And ipaddr_modify happily populates every flag provided on the command line w/o checking whether
> the flag is applicable for the respective command.
> 
> Having said this only the usage info needs to be extended.
> Not sure: Should the related patch go to this mailing list or to Stephen directly who seems to be the
> current maintainer.

iproute patches are handled the same way as kernel patches on this mailing
list. Cc Stephen wouldn't hurt either. ;)

Bye,

  Hannes
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