Re: [PATCH net-next v1 1/1] net: bridge: ensure that link-local traffic cannot unlock a locked port

Vladimir Oltean
2022-07-01T15:27:07Z

On Fri, Jul 01, 2022 at 04:51:44PM +0300, Ido Schimmel wrote:
> On Fri, Jul 01, 2022 at 09:47:24AM +0200, Hans S wrote:
> > One question though... wouldn't it be an issue that the mentioned
> > option setting is bridge wide, while the patch applies a per-port
> > effect?
>
> Why would it be an issue? To me, the bigger issue is changing the
> semantics of "locked" in 5.20 compared to previous kernels.
>
> What is even the use case for enabling learning when the port is locked?
> In current kernels, only SAs from link local traffic will be learned,
> but with this patch, nothing will be learned. So why enable learning in
> the first place? As an administrator, I mark a port as "locked" so that
> only traffic with SAs that I configured will be allowed. Enabling
> learning when the port is locked seems to defeat the purpose?

I think if learning on a locked port doesn't make sense, the bridge
should just reject that configuration.