netdev - Re: [RFC][PATCH 3/3]ipv6:fix the outgoing interface selection order in udpv6

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Date:	Wed, 10 Dec 2008 01:15:14 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	yanghy@...fujitsu.com
Cc:	remi.denis-courmont@...ia.com, netdev@...r.kernel.org
Subject: Re: [RFC][PATCH 3/3]ipv6:fix the outgoing interface selection
 order in udpv6_sendmsg()

From: Yang Hongyang <yanghy@...fujitsu.com>
Date: Wed, 10 Dec 2008 14:38:25 +0800

> Yang Hongyang wrote:
> > David Miller wrote:
> >> From: Yang Hongyang <yanghy@...fujitsu.com>
> >> Date: Wed, 10 Dec 2008 08:42:20 +0800
> >>
> >>> If outgoing interface is set with SO_BINDTODEVICE and also sticky pktinfo
> >>> the outgoing interface is exactly what SO_BINDTODEVICE set,because in my
> >>> first patch,when set sticy pktinfo,outgoing interface set by SO_BINDTODEVICE
> >>> is checked:
> >>>
> >>> +		if(sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
> >>> +			goto e_inval;
> >>>
> >> You may be checking this, but these two values can become out of sync
> >> if the application next makes a SO_BINDTODEVICE setsockopt() call to
> >> change the index setting.
> >>
> >> Nothing makes sure the sticky ipv6 socket information is updated
> >> if that happens.  And the most obvious ways to handle that are
> >> very ugly, doing some kind of call into ipv6 from the generic
> >> socket SO_BINDTODEVICE setsockopt() handler.
> >>
> >>
> > 
> > Hum..can we just ignore the sync of the sticky option and the SO_BINDTODEVICE,
> > when send a message,first check sk_bound_dev_if,If it is specified,use it,otherwise
> > use sticky option?This was what i ment. and in my patch ,the outgoing interface 
> > specified by sticky options will be overrided by the interface specified by 
> > SO_BINDTODEVICE.
> 
> If this is the solution, i'll post a updated patch.

Please do, this sounds like the correct approach.
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