netdev - Re: [PATCH RFC net-next 08/13] net: bridge: avoid classifying unknown multicast as mrouters

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Date:   Wed, 13 Apr 2022 12:12:55 +0200
From:   Joachim Wiberg <troglobit@...il.com>
To:     Nikolay Aleksandrov <razor@...ckwall.org>,
        Roopa Prabhu <roopa@...dia.com>
Cc:     netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH RFC net-next 08/13] net: bridge: avoid classifying unknown multicast as mrouters_only

On Wed, Apr 13, 2022 at 12:00, Nikolay Aleksandrov <razor@...ckwall.org> wrote:
> On 13/04/2022 11:55, Nikolay Aleksandrov wrote:
>> On 13/04/2022 11:51, Joachim Wiberg wrote:
>>> So, if I add a bridge flag, default off as you mentioned out earlier,
>>> which changes the default behavior of MCAST_FLOOD, then you'd be OK with
>>> that?  Something cheeky like this perhaps:
>>>     if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
>>>        	BR_INPUT_SKB_CB(skb)->mrouters_only = !br_opt_get(br, BROPT_MCAST_FLOOD_RFC4541);
>> Exactly! And that is exactly what I had in mind when I wrote it. :)

Awesome, thank you! :)

> Just please use a different option name that better suggests what it does.

Heh, yeah spent a good while with my colleague (Tobias) thinking about
how to name this one.  I'll see what I can come up with, but whatever
shows up in the next patch iteration will be very open for discussion.

Cheers
 /Joachim