netdev - Re: ICMP redirect issue

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Message-Id: <20110928.185654.560483806662347226.davem@davemloft.net>
Date:	Wed, 28 Sep 2011 18:56:54 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	fbl@...hat.com
Cc:	netdev@...r.kernel.org
Subject: Re: ICMP redirect issue

From: Flavio Leitner <fbl@...hat.com>
Date: Wed, 28 Sep 2011 17:19:52 -0300

> What about something like below? It will change a bit the
> secure_redirects documentation.

The previous check was stronger, and served other purposes.

Firstly, it required that the spoofer know the exact gateway
IP address we used previously, whereas your test requires only
knowing the subnet which is easier to figure out.

But more importantly, the old test allowed us to ignore outdated
or erroneous redirects.

We really have to restore the original behavior before my inetpeer
changes (enforce that the old gateway matches), and find another way
to accomodate IPVS.
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