netdev - Re: [PATCH] ipv4: dont create routes on down devices

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Date:	Thu, 23 Dec 2010 10:50:25 +0200
From:	Octavian Purdila <opurdila@...acom.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	nicolas.dichtel@...nd.com, David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] ipv4: dont create routes on down devices

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wednesday 22 December 2010, 16:39:39

> [PATCH] ipv4: dont create routes on down devices
> 
> In ip_route_output_slow(), instead of allowing a route to be created on
> a not UPed device, report -ENETUNREACH immediately.
> 
> # ip tunnel add mode ipip remote 10.16.0.164 local
> 10.16.0.72 dev eth0
> # (Note : tunl1 is down)
> # ping -I tunl1 10.1.2.3
> PING 10.1.2.3 (10.1.2.3) from 192.168.18.5 tunl1: 56(84) bytes of data.
> (nothing)
> # ./a.out tunl1
> # ip tunnel del tunl1
> Message from syslogd@...lby at Dec 22 10:12:08 ...
>   kernel: unregister_netdevice: waiting for tunl1 to become free.
> Usage count = 3
> 
> After patch:
> # ping -I tunl1 10.1.2.3
> connect: Network is unreachable
> 
> 
> Reported-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> Cc: Octavian Purdila <opurdila@...acom.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Thanks Eric !

Reviewed-by: Octavian Purdila <opurdila@...acom.com>
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