[Bridge] Problem with bridge (mcast-to-ucast + hairpin) and Broadcom's 802.11f in their FullMAC fw

[Rafał Miłecki]

On 12 March 2018 at 12:48, Linus Lüssing <linus.luessing at c0d3.blue> wrote:
> On Mon, Mar 12, 2018 at 12:08:56PM +0100, Linus Lüssing wrote:
>> On Tue, Feb 27, 2018 at 11:08:20AM +0100, Rafał Miłecki wrote:
>> > I've problem when using OpenWrt/LEDE on a home router with Broadcom's
>> > FullMAC WiFi chipset.
>>
>> Hi Rafał,
>>
>> Thanks for reporting this issue!
>>
>> > Can you see any solution for this problem? Is that an option to stop
>> > multicast-to-unicast from touching 802.11f packets? Some other ideas?
>> > Obviously I can't modify Broadcom's firmware and drop that obsoleted
>> > standard.
>>
>> Just to avoid some potential confusion: This is more an issue of
>> hairpinning than it is an issue of multicast-to-unicast per se,
>> right?
>>
>> That is, if you set this to 0 manually:
>> /sys/class/net/<ap-iface>/brport/multicast_to_unicast
>> Then the issue still occurs, right?
>
> Btw., if in OpenWRT/LEDE you set 'option multicast_to_unicast 0'
> in /etc/config/network for the bridge (and not bridge port)
> then netifd should refrain from setting the bridge hairpinning and
> AP isolation on wireless devices, too, if I remember correctly.
>
> Can you confirm that the issue disappears for you then?

Yes, absolutely. This reverts OpenWrt/LEDE to the old setup (no
mcast-to-ucast + hairpin) and it works. I was hoping we can make
mcast-to-ucast + hairpin work with Broadcom's 802.11f however instead
of moving OpenWrt/LEDE back to the old setup.

-- 
Rafał