netdev - Re: [PATCH net-next v3] ipv6: do not overwrite inetpeer metrics prematurely

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Message-ID: <20140326155047.GG22086@order.stressinduktion.org>
Date:	Wed, 26 Mar 2014 16:50:47 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Michal Kubecek <mkubecek@...e.cz>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH net-next v3] ipv6: do not overwrite inetpeer metrics prematurely

On Wed, Mar 26, 2014 at 04:42:45PM +0100, Michal Kubecek wrote:
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index fba54a4..b6dda6a 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -149,8 +149,10 @@ static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
>  		unsigned long prev, new;
>  
>  		p = peer->metrics;
> -		if (inet_metrics_new(peer))
> +		if (inet_metrics_new(peer) || (dst->flags | DST_KEEP_METRICS)) {
>  			memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
> +			dst->flags &= ~DST_KEEP_METRICS;
> +		}

The (dst->flags | DST_KEEP_METRICS) looks very suspicious. ;)

Bye,

  Hannes

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