Subject: Re: [PATCH 1/1] bridge: remove BR_GROUPFWD_RESTRICTED for arbitrary forwarding of reserved addresses

From: Richard Weinberger <[email-masked]>
Date: Mon, 01 Oct 2018 20:54:08 +0200

Am Montag, 1. Oktober 2018, 20:48:21 CEST schrieb Ido Schimmel:
> > This is my plan b, having a u32 classifier that transports STP directly
> > to the other interface.
> > But IMHO this all is a bit hacky and a "forward anything" bridge mode
> > sounds more natural to me.
> 
> But "forwarding STP and PAUSE if the number of slaves is restricted to
> 2" is a hack. The Linux bridge (like other networking equipment) needs
> to conform to standards and to the best of my knowledge what you're
> requesting is explicitly forbidden by IEEE standards.
> 
> Also, if what you need is "forward anything", then Florian's suggestion
> should work for you.

Agreed, both variants are hacks. Depending on the point of view one might seem
less hacky than the other. :-)

As I said, netfilter is also part of the game. Unless I miss something, netfilter
won't see any packets if tc-mirred is used.
So the only option is having a bridge and transport STP via tc-mirred
or patching the bridge code (what we do right now).
 
Thanks,
//richard