linux-kernel - Re: [PATCH v8 net-next 10/12] net: dsa: mv88e6xxx: mac-auth/MAB implementation

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Date:   Sat, 22 Oct 2022 12:55:14 +0000
From:   Oleksandr Mazur <oleksandr.mazur@...ision.eu>
To:     Vladimir Oltean <olteanv@...il.com>
CC:     "netdev@...io-technology.com" <netdev@...io-technology.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
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Subject: Re: [PATCH v8 net-next 10/12] net: dsa: mv88e6xxx: mac-auth/MAB
 implementation


> I hope the following script will exemplify what I mean.
..
Oh, i get it now.

Frankly speaking we haven't stumbled across such scenario / issue before. But i can tell it does indeed seems a bit broken;

I think there are 2 options here:
  1. The setup itself seems insecure, and user should be aware of such behavior / issue;
  2. Bridge indeed should not learn MACs if BR_PORT_LOCKED is set. E.g. learning condition should be something like: not BR_PORT_locked and learning is on; 


> I don't understand the last step. Why is the BR_PORT_LOCKED flag disabled?
> If disabled, the port will receive frames with any unknown MAC SA,
> not just the authorized ones.

Sorry for the confusion. Basically, what i described what i would expect from a daemon (e.g. daemon would disable LOCKED); So just ignore that part.