netdev - Re: [PATCH 2/2] ipv4: Don't update the pmtu on mtu locked routes

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Message-ID: <alpine.LFD.2.00.1301171039500.1685@ja.ssi.bg>
Date:	Thu, 17 Jan 2013 10:41:44 +0200 (EET)
From:	Julian Anastasov <ja@....bg>
To:	Steffen Klassert <steffen.klassert@...unet.com>
cc:	David Miller <davem@...emloft.net>, timo.teras@....fi,
	luky-37@...mail.com, pupilla@...ero.it, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] ipv4: Don't update the pmtu on mtu locked routes


	Hello,

On Thu, 17 Jan 2013, Steffen Klassert wrote:

> Routes with locked mtu should not use learned pmtu informations,
> so do not update the pmtu on these routes.
> 
> Reported-by: Julian Anastasov <ja@....bg>
> Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
> ---
>  net/ipv4/route.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index 6e4a89c..259cbee 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -912,6 +912,9 @@ static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu)
>  	struct dst_entry *dst = &rt->dst;
>  	struct fib_result res;
>  
> +	if (dst_metric_locked(dst, RTAX_MTU))
> +		return;
> +
>  	if (dst->dev->mtu < mtu)
>  		return;
>  
> -- 
> 1.7.9.5

	Thanks

--
Julian Anastasov <ja@....bg>
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