[PATCH] hostapd: Don't force HT Mixed Mode for non-GF STAs

Johannes Berg johannes at sipsolutions.net
Wed Mar 2 04:12:51 EST 2011


On Wed, 2011-03-02 at 10:04 +0100, Helmut Schaa wrote:

> > Not sure really, this HT stuff isn't as well defined as we'd like :-)
> 
> Yes, but this particular part looks well enough defined to me ;)
> 
> 802.11n-2009, 9.13.3.1, page 143:
> 
> "When the HT Protection field is set to no protection mode or 20 MHz protection
> mode and the Nongreenfield HT STAs Present field is set to 1, HT transmissions
> that use the HT-greenfield format shall be protected."

Well, that's the external protocol between different stations. The
internal protocol (API) between the components of each station is a
different matter.

> So, in this case the driver used by the AP should also protect GF
> transmissions as long as hostapd passes the new htopmode to it.

Maybe it should. I just don't think it does.

johannes



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