netdev - Re: Routing Policy Database Rule 0

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Date:	Tue, 20 Oct 2015 10:45:48 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Richard Laing <Richard.Laing@...iedtelesis.co.nz>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Routing Policy Database Rule 0

On 10/20/15 at 01:58am, Richard Laing wrote:
> Hi,
> 
> We recently found a bug in our code which resulted in rule 0 in the 
> routing policy database being deleted, this is a bad thing and the man 
> page documentation for "ip rule" indicates
> 
> Rule 0 is special. It cannot be deleted or overridden.
> 
> which seems entirely reasonable. The code in net/core/fib_rules.c does 
> not seem to protect against deletion of this rule and I was wondering if 
> there is a reason for this. If not I will submit a patch to address it.

This behaviour was changed in commit 5adef1809
("net: fib_rules: allow to delete local rule") so it seems the manual
page is outdated. Feel free to send a patch.

> Simply running "ip rule del" shows the issue .

This however looks like a bug.
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