linux-kernel - Re: [PATCH v5 net-next 6/6] selftests: forwarding: add test of MAC-Auth Bypass to locked port tests

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Message-ID: <9e1a9eb218bbaa0d36cb98ff5d4b97d7@kapio-technology.com>
Date:   Mon, 29 Aug 2022 14:04:42 +0200
From:   netdev@...io-technology.com
To:     Ido Schimmel <idosch@...dia.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.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>,
        Christian Marangi <ansuelsmth@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yuwei Wang <wangyuweihx@...il.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        bridge@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v5 net-next 6/6] selftests: forwarding: add test of
 MAC-Auth Bypass to locked port tests

On 2022-08-29 13:32, Ido Schimmel wrote:
>> The final decision on this rests with you I would say.
> 
> If the requirement for this feature (with or without MAB) is to work
> with dynamic entries (which is not what is currently implemented in the
> selftests), then learning needs to be enabled for the sole reason of
> refreshing the dynamic entries added by user space. That is, updating
> 'fdb->updated' with current jiffies value.
> 
> So, is this the requirement? I checked the hostapd fork you posted some
> time ago and I get the impression that the answer is yes [1], but I 
> want
> to verify I'm not missing something.
> 
> [1] 
> https://github.com/westermo/hostapd/commit/95dc96f9e89131b2319f5eae8ae7ac99868b7cd0#diff-338b6fad34b4bdb015d7d96930974bd96796b754257473b6c91527789656d6edR11
> 
> 

I cannot say that it is a requirement with respect to the bridge 
implementation, but it is with the driver implementation. But you are 
right that it is to be used with dynamic entries.

>> > # ip link set dev swp1 up
>> > # ip link set dev swp2 up
>> > # ip link set dev br0 up
>> >
>> > 2. Assuming h1 behind swp1 was authorized using 802.1X:
>> >
>> > # bridge fdb replace $H1_MAC dev swp1 master dynamic
>> 
>> With the new MAB flag 'replace' is not needed when MAB is not enabled.
> 
> Yes, but replace works in both cases.
> 

Yes, of course.

>> 
>> >
>> > 3. Assuming 802.1X authentication failed for h2 behind swp2, enable MAB:
>> >
>> > # bridge link set dev swp2 mab on
>> >
>> > 4. Assuming $H2_MAC is in our allow list:
>> >
>> > # bridge fdb replace $H2_MAC dev swp2 master dynamic
>> >
>> > Learning is on in order to refresh the dynamic entries that user space
>> > installed.
>> 
>> Yes, port association is needed for those reasons. :-)
> 
> Given that the current tests use "static" entries that cannot age, is
> there a reason to have "learning on"?
> 

Port association is needed for MAB to work at all on mv88e6xxx, but for 
802.1X port association is only needed for dynamic ATU entries.

>> 
>> >
>> > (*) Need to add support for this option in iproute2. Already exposed
>> > over netlink (see 'IFLA_BR_MULTI_BOOLOPT').
>> 
>> Should I do that in this patch set?
> 
> No, I'm saying that this option is already exposed over netlink, but
> missing iproute2 support. No kernel changes needed.

Oh yes, I meant in the iproute2 accompanying patch set to this one?