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

Ido Schimmel
2022-07-01T15:44:56Z

On Fri, Jul 01, 2022 at 06:27:00PM +0300, Vladimir Oltean wrote:
> 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.

I tend to agree... Let's wait for Hans to explain why learning needs to
be enabled on mv88e6xxx and see how we handle it in mv88e6xxx and the
bridge.