This functionality works around the kernel's behavior of allowing
6GHz only after a regulatory domain update. If the regdom updates
scan.c needs to be aware in order to split up periodic scans, or
insert 6GHz frequencies into an ongoing periodic scan. Doing this
allows any 6GHz BSS's to show up in the scan results rather than
needing to issue an entirely new scan to see these BSS's.
The kernel's regulatory domain updates after some number of beacons
are processed. This triggers a regulatory domain update (and wiphy
dump) but only after a scan request. This means a full scan started
prior to the regdom being set will not include any 6Ghz BSS's even
if the regdom was unlocked during the scan.
This can be worked around by splitting up a large scan request into
multiple requests allowing one of the first commands to trigger a
regdom update. Once the regdom updates (and wiphy dumps) we are
hopefully still scanning and could append an additional request to
scan 6GHz.
In the case of an external scan, we won't have a scan_request object,
sr. Make sure to not crash in this case.
Also, since scan_request can no longer carry the frequency set in all
cases, add a new member to scan_results in order to do so.
Fixes: 27d8cf4ccc ("scan: track scanned frequencies for entire request")
The kernel handles setting the regulatory domain by receiving beacons
which set the country IE. Presumably since most regulatory domains
disallow 6GHz the default (world) domain also disables it. This means
until the country is set, 6GHz is disabled.
This poses a problem for IWD's quick scanning since it only scans a few
frequencies and this likely isn't enough beacons for the firmware to
update the country, leaving 6Ghz inaccessable to the user without manual
intervention (e.g. iw scan passive, or periodic scans by IWD).
To try and work around this limitation the quick scan logic has been
updated to check if a 6GHz AP has been connected to before and if that
frequency is disabled (but supported). If this is the case IWD will opt
for a full passive scan rather than scanning a limited set of
frequencies.
For whatever reason the kernel will send regdom updates even if
the regdom didn't change. This ends up causing wiphy to dump
which isn't needed since there should be no changes in disabled
frequencies.
Now the previous country is checked against the new one, and if
they match the wiphy is not dumped again.
A change in regulatory domain can result in frequencies being
enabled or disabled depending on the domain. This effects the
frequencies stored in wiphy which other modules depend on
such as scanning, offchannel work etc.
When the regulatory domain changes re-dump the wiphy in order
to update any frequency restrictions.
A helper to check whether the country code corresponds to a
real country, or some special code indicating the country isn't
yet set. For now, the special codes are OO (world roaming) and
XX (unknown entity).
Events to indicate when a regulatory domain wiphy dump has
started and ended. This is important because certain actions
such as scanning need to be delayed until the dump has finished.
The NEW_SCAN_RESULTS handling was written to only parse the frequency
list if there were no additional scan commands to send. This results in
the scan callback containing frequencies of only the last CMD_TRIGGER.
Until now this worked fine because a) the queue is only used for hidden
networks and b) frequencies were never defined by any callers scanning
for hidden networks (e.g. dbus/periodic scans).
Soon the scan command queue will be used to break up scan requests
meaning only the last scan request frequencies would be used in the
callback, breaking the logic in station.
Now the NEW_SCAN_RESULTS case will parse the frequencies for each scan
command rather than only the last.
The compiler treated the '1' as an int type which was not big enough
to hold a bit shift of 31:
runtime error: left shift of 1 by 31 places cannot be represented in
type 'int'
Instead of doing the iftype check manually, refactor
wiphy_get_supported_iftypes by adding a subroutine which just parses
out iftypes from a mask into a char** list. This removes the need to
case each iftype into a string.
Add extra logging around CQM events to help track wifi status. This is
useful for headless systems that can only be accessed over the network
and so information in the logs is invaluable for debugging outages.
Prior to this change, the only log for CQM messages is saying one was
received. This adds details to what attributes were set and the
associated data with them.
The signal strength log format was chosen to roughly match
wpa_supplicant's which looks like this:
CTRL-EVENT-SIGNAL-CHANGE above=1 signal=-60 noise=-96 txrate=6000
Provides useful information on why a roam might have failed, such as
failing to find the BSS or the BSS being ranked lower, and why that
might be.
The output format is the same as station_add_seen_bss for consistency.
If a frequency is disabled IWD should keep track and disallow any
operations on that channel such as scanning. A new list has been added
which contains only disabled frequencies.
The scan_passive API wasn't using a const struct scan_freq_set as it
should be since it's not modifying the contents. Changing this to
const did require some additional changes like making the scan_parameters
'freqs' member const as well.
After changing scan_parameters, p2p needed updating since it was using
scan_parameters.freqs directly. This was changed to using a separate
scan_freq_set pointer, then setting to scan_parameters.freqs when needed.
Similar to the HT/VHT APIs, this estimates the data rate based on the
HE Capabilities element, in addition to our own capabilities. The
logic is much the same as HT/VHT. The major difference being that HE
uses several MCS tables depending on the channel width. Each width
MCS set is checked (if supported) and the highest estimated rate out
of all the MCS sets is used.
There appears to be a compiler bug with gcc 11.2 which thinks the vht_mcs_set
is a zero length array, and the memset of size 8 is out of bounds. This is only
seen once an element is added to 'struct band'.
In file included from /usr/include/string.h:519,
from src/wiphy.c:34:
In function ‘memset’,
inlined from ‘band_new_from_message’ at src/wiphy.c:1300:2,
inlined from ‘parse_supported_bands’ at src/wiphy.c:1423:11,
inlined from ‘wiphy_parse_attributes’ at src/wiphy.c:1596:5,
inlined from ‘wiphy_update_from_genl’ at src/wiphy.c:1773:2:
/usr/include/bits/string_fortified.h:59:10: error: ‘__builtin_memset’ offset [0, 7] is out of the bounds [0, 0] [-Werror=array-bounds]
59 | return __builtin___memset_chk (__dest, __ch, __len,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
60 | __glibc_objsize0 (__dest));
| ~~~~~~~~~~~~~~~~~~~~~~~~~~
In test-band the band object was allocated using l_malloc, but not
memset to zero. This will cause problems if allocated pointers are
included in struct band once band is freed.
This increases the maximum data rate which now is possible with HE.
A few comments were also updated, one to include 6G when adjusting
the rank for >4000mhz, and the other fixing a typo.
This is a general way of finding the best MCS/NSS values which will work
for HT, VHT, and HE by passing in the max MCS values for each value which
the MCS map could contain (0, 1, or 2).
The HE capabilities information is contained in
NL80211_BAND_ATTR_IFTYPE_DATA where each entry is a set of attributes
which define the rules for one or more interface types. This patch
specifically parses the HE PHY and HE MCS data which will be used for
data rate estimation.
Since the set of info is per-iftype(s) the data is stored in a queue
where each entry contains the PHY/MCS info, and a uint32 bit mask where
each bit index signifies an interface type.
With the addition of HE, the print function for MCS sets needs to change
slightly. The maps themselves are the same format, but the values indicate
different MCS ranges. Now the three MCS max values are passed in.
This queue will hold iftype(s) specific data for HE capabilities. Since
the capabilities may differ per-iftype the data is stored as such. Iftypes
may share a configuration so the band_he_capabilities structure has a
mask for each iftype using that configuration.
