netdev - Re: [PATCH v4] fib_rules: Added NLM_F_EXCL support to fib_nl

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Date:	Thu, 30 Jun 2016 08:24:31 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	mateusz.bajorski@...ia.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v4] fib_rules: Added NLM_F_EXCL support to
 fib_nl_newrule

From: Mateusz Bajorski <mateusz.bajorski@...ia.com>
Date: Wed, 29 Jun 2016 09:22:10 +0200

> When adding rule with NLM_F_EXCL flag then check if the same rule exist.
> If yes then exit with -EEXIST.
> 
> This is already implemented in iproute2:
>         if (cmd == RTM_NEWRULE) {
>                 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
>                 req.r.rtm_type = RTN_UNICAST;
>         }
> 
> Tested ipv4 and ipv6 with net-next linux on qemu x86
> 
> expected behavior after patch:
> localhost ~ # ip rule
> 0:    from all lookup local
> 32766:    from all lookup main
> 32767:    from all lookup default
> localhost ~ # ip rule add from 10.46.177.97 lookup 104 pref 1005
> localhost ~ # ip rule add from 10.46.177.97 lookup 104 pref 1005
> RTNETLINK answers: File exists
> localhost ~ # ip rule
> 0:    from all lookup local
> 1005:    from 10.46.177.97 lookup 104
> 32766:    from all lookup main
> 32767:    from all lookup default
> 
> There was already topic regarding this but I don't see any changes
> merged and problem still occurs.
> https://lkml.kernel.org/r/1135778809.5944.7.camel+%28%29+localhost+%21+localdomain
> 
> Signed-off-by: Mateusz Bajorski <mateusz.bajorski@...ia.com>

Applied to net-next, thanks.