netdev - Re: [RFC 1/2] net: bridge: add knob for filtering rx/tx BPDU packets on a port

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Message-ID: <d4f1f9b1-6e8e-d21d-603f-7a0889e33a78@nvidia.com>
Date:   Thu, 10 Feb 2022 16:55:40 +0200
From:   Nikolay Aleksandrov <nikolay@...dia.com>
To:     Felix Fietkau <nbd@....name>, <netdev@...r.kernel.org>
Subject: Re: [RFC 1/2] net: bridge: add knob for filtering rx/tx BPDU packets
 on a port

On 10/02/2022 16:24, Felix Fietkau wrote:
> Some devices (e.g. wireless APs) can't have devices behind them be part of
> a bridge topology with redundant links, due to address limitations.
> Additionally, broadcast traffic on these devices is somewhat expensive, due to
> the low data rate and wakeups of clients in powersave mode.
> This knob can be used to ensure that BPDU packets are never sent or forwarded
> to/from these devices
> 
> Signed-off-by: Felix Fietkau <nbd@....name>
> ---
>  include/linux/if_bridge.h    | 1 +
>  include/uapi/linux/if_link.h | 1 +
>  net/bridge/br_forward.c      | 5 +++++
>  net/bridge/br_input.c        | 2 ++
>  net/bridge/br_netlink.c      | 6 +++++-
>  net/bridge/br_stp_bpdu.c     | 9 +++++++--
>  net/core/rtnetlink.c         | 4 +++-
>  7 files changed, 24 insertions(+), 4 deletions(-)
> 

Why can't netfilter or tc be used to filter these frames?