netdev - Re: Unable to flush ICMP redirect routes in kernel 3.0+

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Message-ID: <1321547510.2751.66.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Thu, 17 Nov 2011 17:31:50 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Flavio Leitner <fbl@...hat.com>
Cc:	David Miller <davem@...emloft.net>,
	Ivan Zahariev <famzah@...soft.com>, netdev@...r.kernel.org,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: Unable to flush ICMP redirect routes in kernel 3.0+

Le jeudi 17 novembre 2011 à 13:37 -0200, Flavio Leitner a écrit :
> On Thu, 17 Nov 2011 15:40:20 +0100
> Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
> > [PATCH] ping: dont increment ICMP_MIB_INERRORS
> > 
> > ping module incorrectly increments ICMP_MIB_INERRORS if feeded with a
> > frame not belonging to its own sockets.
> > 
> > RFC 2011 states that ICMP_MIB_INERRORS should count "the number of
> > ICMP messages which the entiry received but determined as having
> > ICMP-specific errors (bad ICMP checksums, bad length, etc.)."
> > 
> > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> > CC: Vasiliy Kulikov <segoon@...nwall.com>
> 
> Yeah, they aren't ICMP specific errors and the callers already
> checked for checksum, lengths, and etc.. increasing that counter
> when necessary.
> 
> Acked-by: Flavio Leitner <fbl@...hat.com>

Thanks

By the way, redirects dont work at all in net-next

Probably coming from your commit 7cc9150ebe8ec0
(route: fix ICMP redirect validation)

Since calling __ip_route_output_key() will create the route with s = 0,
l = 0  (forcing saddr and dev->ifindex) selectors...

We have to add a 'create' parameter to __ip_route_output_key() so that
ip_rt_redirect() doesnt create a route, only find the existing one in
cache ?



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