netdev - Re: [BUG] ipv6: all routes share same inetpeer

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Date:	Tue, 19 Jul 2011 11:59:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [BUG] ipv6: all routes share same inetpeer

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 19 Jul 2011 20:57:50 +0200

> Le mardi 19 juillet 2011 à 20:20 +0200, Eric Dumazet a écrit :
>> Le mardi 19 juillet 2011 à 10:37 -0700, David Miller a écrit :
>> > From: Eric Dumazet <eric.dumazet@...il.com>
>> > Date: Tue, 19 Jul 2011 19:23:49 +0200
>> > 
>> > > Maybe you can find the bug before me ?
>> > 
>> > I think when we add the route we cow the metrics almost immediately.
>> > The daddr is, unfortunately, fully prefixed at that point.
>> 
>> Yes, we shall provide a second ip6_rt_copy() argument, with the
>> destination address.
>> 
> 
> Hmm, or maybe just change the dst_copy_metrics(&rt->dst, &ort->dst);
> call done from ip6_rt_copy(), to avoid doing the COW if not really
> needed ?

This is ok if it handles the case where ort's metrics point to
writable inetpeer memory.
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