From: Mateusz Bajorski <mateusz.bajor...@nokia.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.bajor...@nokia.com>
Applied to net-next, thanks.
