linux-kernel - Re: [PATCH] ipv6: notify userspace when we added or changed an ipv6 token

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Message-ID: <1414362511.29980.4.camel@belphegor.lan>
Date:	Sun, 26 Oct 2014 23:28:31 +0100
From:	Lubomir Rintel <lkundrak@...sk>
To:	Daniel Borkmann <dborkman@...hat.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH] ipv6: notify userspace when we added or changed an ipv6
 token

On Mon, 2014-10-13 at 11:46 +0200, Daniel Borkmann wrote:
> On 10/10/2014 04:08 PM, Lubomir Rintel wrote:
> > NetworkManager might want to know that it changed when the router advertisement
> > arrives.
> >
> > Signed-off-by: Lubomir Rintel <lkundrak@...sk>
> > Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>
> > Cc: Daniel Borkmann <dborkman@...hat.com>
> > ---
> >   net/ipv6/addrconf.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> > index 3e118df..3d11390 100644
> > --- a/net/ipv6/addrconf.c
> > +++ b/net/ipv6/addrconf.c
> > @@ -4528,6 +4528,7 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
> >   	}
> >
> >   	write_unlock_bh(&idev->lock);
> > +	netdev_state_change(dev);
> 
> I'm wondering why netdev_state_change()? You are probably
> only after the netlink notification that is being invoked,
> i.e. rtmsg_ifinfo(RTM_NEWLINK, ...), and don't strictly want
> to call the device notifier chain.

Correct. I'll change it to just rtmsg_ifinfo().

> Perhaps it might be better to define a new RTM_SETTOKEN, and
> just call inet6_ifinfo_notify(RTM_SETTOKEN, idev) as this is
> only idev specific anyway?

I'm not really sure as that would require more userspace changes than
necessary.

> >   	addrconf_verify_rtnl();
> >   	return 0;
> >   }
> >


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