netdev - Re: [PATCH] ipv4: remove all rt cache entries on UNREGISTER event

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Message-ID: <4D11B7AC.8000205@6wind.com>
Date:	Wed, 22 Dec 2010 09:32:44 +0100
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev <netdev@...r.kernel.org>,
	Octavian Purdila <opurdila@...acom.com>
Subject: Re: [PATCH] ipv4: remove all rt cache entries on UNREGISTER event

What is the status of this patch? The initial problem is still here in 2.6.37-rc5+


Regards,
Nicolas

Le 29.09.2010 11:18, Eric Dumazet a écrit :
> I found following patch was enough to avoid route being created if
> device is down. This is still racy and needs more thinking.
> 
> 
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index ac6559c..1ee0b1a 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -2586,9 +2586,10 @@ static int ip_route_output_slow(struct net *net, struct rtable **rp,
>  			goto out;
>  
>  		/* RACE: Check return value of inet_select_addr instead. */
> -		if (__in_dev_get_rtnl(dev_out) == NULL) {
> +		if (!(dev_out->flags & IFF_UP) || __in_dev_get_rtnl(dev_out) == NULL) {
>  			dev_put(dev_out);
> -			goto out;	/* Wrong error code */
> +			err = -ENETUNREACH;
> +			goto out;
>  		}
>  
>  		if (ipv4_is_local_multicast(oldflp->fl4_dst) ||
> 
> 
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