linux-kernel - Re: [PATCH] net: Fix sk_dst_check() to reset the obsolete dst

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Message-ID: <AANLkTikx+GadeYfg5rZNxsEig-0Af97ER7V94fjaVc+U@mail.gmail.com>
Date:	Wed, 6 Oct 2010 00:47:47 -0700
From:	Chung-Yih Wang (王崇懿) 
	<cywang@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	timo.teras@....fi
Subject: Re: [PATCH] net: Fix sk_dst_check() to reset the obsolete dst_entry
 of a socket.

In fact, that is what I intent to change originally. However, consider
Timo's issue, I intent to submit this patch instead.

On Wed, Oct 6, 2010 at 12:35 AM, David Miller <davem@...emloft.net> wrote:
>
> This should have been fixed by:
>
> --------------------
> commit ae2688d59b5f861dc70a091d003773975d2ae7fb
> Author: Jianzhao Wang <jianzhao.wang@...nd.com>
> Date:   Wed Sep 8 14:35:43 2010 -0700
>
>    net: blackhole route should always be recalculated
>
>    Blackhole routes are used when xfrm_lookup() returns -EREMOTE (error
>    triggered by IKE for example), hence this kind of route is always
>    temporary and so we should check if a better route exists for next
>    packets.
>    Bug has been introduced by commit d11a4dc18bf41719c9f0d7ed494d295dd2973b92.
>
>    Signed-off-by: Jianzhao Wang <jianzhao.wang@...nd.com>
>    Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
>    Signed-off-by: David S. Miller <davem@...emloft.net>
>
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index 3f56b6e..6298f75 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -2738,6 +2738,11 @@ slow_output:
>  }
>  EXPORT_SYMBOL_GPL(__ip_route_output_key);
>
> +static struct dst_entry *ipv4_blackhole_dst_check(struct dst_entry *dst, u32 cookie)
> +{
> +       return NULL;
> +}
> +
>  static void ipv4_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
>  {
>  }
> @@ -2746,7 +2751,7 @@ static struct dst_ops ipv4_dst_blackhole_ops = {
>        .family                 =       AF_INET,
>        .protocol               =       cpu_to_be16(ETH_P_IP),
>        .destroy                =       ipv4_dst_destroy,
> -       .check                  =       ipv4_dst_check,
> +       .check                  =       ipv4_blackhole_dst_check,
>        .update_pmtu            =       ipv4_rt_blackhole_update_pmtu,
>        .entries                =       ATOMIC_INIT(0),
>  };
>
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