This adds a few utilities for setting up an FT environment. All the
roaming tests basically copy/paste the same code for setting up the
hostapd instances and this can cause problems if not done correctly.
set_address() sets the MAC address on the device, and restarts hostapd
group_neighbors() takes a list of HostapdCLI objects and makes each a
neighbor to the others.
The neighbor report element requires the operating class which isn't
advertised by hostapd. For this we assume operating class 81 but this
can be set explicitly if it differs. Currently no roaming tests use
5/6GHz frequencies, and just in case an exception will be thrown if
the channel is greater than 14 and the op_class didn't change.
The packet loss test had a few problems. First being that the RSSI for
the original BSS was not low enough to change the rank. This meant any
roam was just lucky that the intended BSS was first in the results.
The second problem is timing related, and only happens on UML. Disabling
the rules after the roaming condition sometimes allows IWD to fully
roam and connect before the next state change checks.
A new test which blocks all data frames once connected, then tries
to send 100 packets. This should result in the kernel sending a
packet loss event to userspace, which IWD should react to and roam.
This adds a new netdev event for packet loss notifications from
the kernel. Depending on the scenario a station may see packet
loss events without any other indications like low RSSI. In these
cases IWD should still roam since there is no data flowing.
The limitations of readline required that the autocompletion choose
a 'default' device. With multiple phys this doesn't work. Now the
readline limitation has been worked around and station can look up
the device for the command completion.
There is a limitation of libreadline where no context/userdata
can be passed to completion functions. Thi affects iwctl since
the entity value isn't known to completion functions.
Workarounds such as getting the default device are employed but
its not a great solution.
Instead hack around this limitation by parsing the prompt to
extract the entity (second arg). Then use a generic match function
given to readline which can call the actual match function and
include the entity.
The ATTR_ARRAY type was quite limited, only supporting u16/u32 and
addresses. This changes the union to a struct so nested/function
can be defined along with array_type.
Some APs use an older hostapd OWE implementation which incorrectly
derives the PTK. To work around this group 19 should be used for
these APs. If there is a failure (reason=2) and the AKM is OWE
set force default group into network and retry. If this has been
done already the behavior is no different and the BSS will be
blacklisted.
If a OWE network is buggy and requires the default group this info
needs to be stored in network in order for it to set this into the
handshake on future connect attempts.
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.
