[Bug 275424] IEEE80211_IOC_SCAN_MAX_SSID differs from IEEE80211_SCAN_MAX_SSID

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275424

Bjoern A. Zeeb <bz@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |bz@FreeBSD.org
             Status|New                         |Open

--- Comment #1 from Bjoern A. Zeeb <bz@FreeBSD.org> ---
If you look at

net80211::ieee80211_scanreq():

you'll find the following comment:

  /* NB: silently reduce ssid count to what is supported */

It's hard to say (given the huge updates pushed back then) why the IOC version
was introduced but it seems it was done on purpose.

The hostap history says it was done for FreeBSD 8 support:
88487b0e0b524aae7603c17b7db7985ae9a810c9


If you look further at the code, you'll find that despite being capped (further
down the stack, e.g. down to ieee80211_scan_copy_ssid()) the number of SSIDs is
passed down.

If you look further in scan_curchan()/ieee80211_swscan_probe_curchan() you can
see that it would send a probe request per SSID and that matches the comment in
ieee80211_scan.h.  But that code was there before already.  Seems to have come
in with 68e8e04e93c1ec3d37022223b69073f50d3d4981.

I wonder if this is missing follow-up work to finish it given modern hardware
can probe 16/20/.. SSIDs?

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