netdev - Re: [PATCH net] fib_rules: return 0 directly if an exactly same rule exists when NLM_F

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Message-ID: <CAKD1Yr1UNV-rzM3tPgcsmTRok7fSb43cmb4bGktxNsU0Bx3Hzw@mail.gmail.com>
Date:   Wed, 5 Jun 2019 11:25:11 +0900
From:   Lorenzo Colitti <lorenzo@...gle.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     David Ahern <dsahern@...il.com>,
        David Miller <davem@...emloft.net>,
        Yaro Slav <yaro330@...il.com>,
        Thomas Haller <thaller@...hat.com>,
        Alistair Strachan <astrachan@...gle.com>,
        Greg KH <greg@...ah.com>,
        Linux NetDev <netdev@...r.kernel.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Maciej Żenczykowski <zenczykowski@...il.com>
Subject: Re: [PATCH net] fib_rules: return 0 directly if an exactly same rule
 exists when NLM_F_EXCL not supplied

On Wed, Jun 5, 2019 at 11:15 AM Hangbin Liu <liuhangbin@...il.com> wrote:
> How do you add the rules? with ip cmd it should has NLM_F_EXCL flag and
> you will get -EEXIST error out.

The fact that the code worked before this commit implies that it was
*not* using NLM_F_EXCL. :-)
The code is here if you want to take a look.

https://android.googlesource.com/platform/system/netd/+/master/server/RouteController.cpp#576
https://android.googlesource.com/platform/system/netd/+/master/server/NetlinkCommands.h#33