linux-kernel - Re: [PATCH RESEND v2] ipv4: Do not cache routing failures due to disabled forwarding.

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Message-Id: <20141030.192115.918754566952396661.davem@davemloft.net>
Date:	Thu, 30 Oct 2014 19:21:15 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	nicolas.cavallari@...en-communications.fr
Cc:	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v2] ipv4: Do not cache routing failures due to
 disabled forwarding.

From: Nicolas Cavallari <nicolas.cavallari@...en-communications.fr>
Date: Thu, 30 Oct 2014 10:09:53 +0100

> If we cache them, the kernel will reuse them, independently of
> whether forwarding is enabled or not.  Which means that if forwarding is
> disabled on the input interface where the first routing request comes
> from, then that unreachable result will be cached and reused for
> other interfaces, even if forwarding is enabled on them.  The opposite
> is also true.
> 
> This can be verified with two interfaces A and B and an output interface
> C, where B has forwarding enabled, but not A and trying
> ip route get $dst iif A from $src && ip route get $dst iif B from $src
> 
> Signed-off-by: Nicolas Cavallari <nicolas.cavallari@...en-communications.fr>
> Reviewed-by: Julian Anastasov <ja@....bg>

Applied and queued up for -stable, thanks.
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