From: Hangbin Liu <liuhang...@gmail.com>
Date: Tue, 7 May 2019 17:11:18 +0800
> With commit 153380ec4b9 ("fib_rules: Added NLM_F_EXCL support to
> fib_nl_newrule") we now able to check if a rule already exists. But this
> only works with iproute2. For other tools like libnl, NetworkManager,
> it still could add duplicate rules with only NLM_F_CREATE flag, like
>
> [localhost ~ ]# ip rule
> 0: from all lookup local
> 32766: from all lookup main
> 32767: from all lookup default
> 100000: from 192.168.7.5 lookup 5
> 100000: from 192.168.7.5 lookup 5
>
> As it doesn't make sense to create two duplicate rules, let's just return
> 0 if the rule exists.
>
> Fixes: 153380ec4b9 ("fib_rules: Added NLM_F_EXCL support to fib_nl_newrule")
> Reported-by: Thomas Haller <thal...@redhat.com>
> Signed-off-by: Hangbin Liu <liuhang...@gmail.com>
Applied and queued up for -stable, thanks.
