netdev - Re: [PATCH v2 net-next 1/4] net: bridge: add fdb flag to extent locked port feature

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Message-ID: <YjM7Iwx4MDdGEHFA@shredder>
Date:   Thu, 17 Mar 2022 15:44:03 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Hans Schultz <schultz.hans@...il.com>, razor@...ckwall.org
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Hans Schultz <schultz.hans+netdev@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Shuah Khan <shuah@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Ido Schimmel <idosch@...dia.com>, linux-kernel@...r.kernel.org,
        bridge@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 net-next 1/4] net: bridge: add fdb flag to extent
 locked port feature

On Thu, Mar 17, 2022 at 10:38:59AM +0100, Hans Schultz wrote:
> Add an intermediate state for clients behind a locked port to allow for
> possible opening of the port for said clients. This feature corresponds
> to the Mac-Auth and MAC Authentication Bypass (MAB) named features. The
> latter defined by Cisco.
> Only the kernel can set this FDB entry flag, while userspace can read
> the flag and remove it by deleting the FDB entry.

Can you explain where this flag is rejected by the kernel?

Nik, it seems the bridge ignores 'NDA_FLAGS_EXT', but I think that for
new flags we should do a better job and reject unsupported
configurations. WDYT?

The neighbour code will correctly reject the new flag due to
'NTF_EXT_MASK'.