netdev - Re: [PATCH net 1/3] ipv6: always prefer rt6i

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Date:	Mon, 21 Oct 2013 07:00:36 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Julian Anastasov <ja@....bg>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, lvs-devel@...r.kernel.org,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH net 1/3] ipv6: always prefer rt6i_gateway if present

On Sun, Oct 20, 2013 at 03:43:03PM +0300, Julian Anastasov wrote:
> In v3.9 6fd6ce2056de2709 ("ipv6: Do not depend on rt->n in
> ip6_finish_output2()." changed the behaviour of ip6_finish_output2()
> such that the recently introduced rt6_nexthop() is used
> instead of an assigned neighbor.
> 
> As rt6_nexthop() prefers rt6i_gateway only for gatewayed
> routes this causes a problem for users like IPVS, xt_TEE and
> RAW(hdrincl) if they want to use different address for routing
> compared to the destination address.
> 
> Another case is when redirect can create RTF_DYNAMIC
> route without RTF_GATEWAY flag, we ignore the rt6i_gateway
> in rt6_nexthop().
> 
> Fix the above problems by considering the rt6i_gateway if
> present, so that traffic routed to address on local subnet is
> not wrongly diverted to the destination address.
> 
> Thanks to Simon Horman and Phil Oester for spotting the
> problematic commit.
> 
> Thanks to Hannes Frederic Sowa for his review and help in testing.
> 
> Reported-by: Phil Oester <kernel@...uxace.com>
> Reported-by: Mark Brooks <mark@...dbalancer.org>
> Signed-off-by: Julian Anastasov <ja@....bg>

Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

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