[OpenWrt-Devel] Regarding bridge multicast-to-unicast patch

Felix Fietkau nbd at openwrt.org
Fri Oct 24 12:35:27 EDT 2014

On 2014-09-11 16:28, Linus Lüssing wrote:
> On Wed, Sep 10, 2014 at 04:31:37PM +0200, Linus Lüssing wrote:
>> Another approach would be
>> to add a feature to mac80211 to disable the forwarding of
>> IGMPv2/MLDv1 reports to other STAs, only forwarding it on the own
>> AP interface so that the bridge would see all reports.
> Hrm, on the other hand, if a querier is actually on one of the
> other STAs then mac80211 would have to forward the report there.
> Which would mean either needing query-snooping in mac80211 (or
> netdev in general) or interaction between mac80211 and the
> bridge-snooping code.
> I really hate this IGMPv2/MLDv1 report suppression...
> (that's where all the complexity in the batman-adv multicast
> optimizations came from, too)
I'd like to get back to suppressing forwarding IGMPv2/MLDv1 reports:
I just learned that we can avoid changing mac80211 at all for this.
If we disable forwarding between stations in mac80211 and enable hairpin
mode on the bridge interface, we have enough control over the data path
to selectively suppress forwarding of reports to be able to deal with
this issue.
Do you have some ideas on how to detect if a report needs to be
forwarded to a station (and if so, to which station)?

- Felix
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