[Bridge] [RFC] Do not activate promiscuous mode on wlan interfaces for bridging.

[Johannes Berg]

> It seems that it is not really necessary to activate promiscuous mode
> when
> attaching a wlan interface to a bridge, and it causes unnecessary
> processing
> overhead to any wlan device.

[...]

> Given this three cases, the best would be to consider case 3 to be not
> supported (it is indeed not supported, AFAIK), and apply the patch below.
> 
> Please let me know what you think of this patch and whether it could interfere
> with any functionality.

All your description makes a lot of sense, but I don't see why altering
the bridge code is necessary. In mac80211, we decided that the "promisc"
bit only means to capture all frames in the current BSS (remember that
in ethernet there is no way to capture frames from different LAN
segments) and hence an AP would not behave differently in promisc mode
at all since, by definition, it sees all BSS traffic.

What exactly is happening when you run into this problem?

johannes
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