Work priority was never explicitly defined anywhere, and a module
using wiphy_radio_work APIs needed to ensure it was not inserting
at a priority that would interfere with other work.
Now all the types of work have been defined with their own priority
and future priorities can easily be added before, after, or in
between existing priorities.
Move the reading of ControlPortOverNL80211 into wiphy itself and
renamed wiphy_control_port_capable to wiphy_control_port_enabled.
This makes things easier for any modules interested in control
port support since they will only have to check this one API rather
than read the settings and check capability.
Some drivers might not actually support control port properly even if
advertised by mac80211. Introduce a new method to wiphy that will take
care of looking up any driver quirks that override the presence of
NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211
Transition Disable indications and information stored in the network
profile needs to be enforced. Since Transition Disable information is
now stored inside the network object, add a new method
'network_can_connect_bss' that will take this information into account.
wiphy_can_connect method is thus deprecated and removed.
Transition Disable can also result in certain AKMs and pairwise ciphers
being disabled, so wiphy_select_akm method's signature is changed and
takes the (possibly overriden) ie_rsn_info as input.
Returns a template RSNX element that can be further modified by callers
to set any additional capabilities if required. wiphy will fill in
those capabilities that are driver / firmware dependent.
The data rate estimation belongs in wiphy since it should take hardware
capabilities into account. Right now the data rate calculation simply
assumes the hardware is as capable as the AP. scan.c will be ported to
use this utility and the data rate estimation will be expanded to take
wiphy capabilities into account.
A prior commit refactored the AKM selection in wiphy.c. This
ended up breaking FILS tests due to the hard coding of a
false fils_hint in wiphy_select_akm. Since our FILS tests
only advertise FILS AKMs wiphy_can_connect would return false
for these networks.
Similar to wiphy_select_akm, add a fils hint parameter to
wiphy_can_connect and pass that down directly to wiphy_select_akm.
These APIs will handle fairness and order in any operations which
radios can only do sequentially (offchannel, scanning, connection etc.).
Both scan and frame-xchg are complex modules (especially scanning)
which is why the radio management APIs were implemented generic enough
where the changes to both modules will be minimal. Any module that
requires this kind of work can push a work item into the radio
management work queue (wiphy_radio_work_insert) and when the work
is ready to be started radio management will call back into the module.
Once the work is completed (and this may be some time later e.g. in
scan results or a frame watch) the module can signal back that the
work is finished (wiphy_radio_work_done). Wiphy will then pop the
queue and continue with the next work item.
A concept of priority was added in order to allow important offchannel
operations (e.g. ANQP) to take priority over other work items. The
priority is an integer, where lower values are of a higher priority.
The concept of priority cleanly solves a lot of the complexity that
was added in order to support ANQP queries (suspending scanning and
waiting for ANQP to finish before connecting).
Instead ANQP queries can be queued at a higher priority than scanning
which removes the need for suspending scans. In addition we can treat
connections as radio management work and insert them at a lower
priority than ANQP, but higher than scanning. This forces the
connection to wait for ANQP without having to track any state.
When a new wiphy is added query its regulatory domain and listen for
nl80211 regulatory notifications to be able to provide current
regulatory country code through the new wiphy_get_reg_domain_country().
This API is being added to support per-network MAC address
generation. The MAC is generated based on the network SSID
and the adapters permanent address using HMAC-SHA256. The
SHA digest is then constrained to make it MAC address
compliant.
Generating the MAC address like this will ensure that the
MAC remains the same each time a given SSID is connected to.
The kernel emits NEW_WIPHY events whenever a new wiphy is registered.
Unfortunately these events are emitted under the 'legacy' semantics and
have a hard size limit of 4096 bytes. Unfortunately, it is possible for
a NEW_WIPHY message to exceed this limit (ath10k cards seem to be
affected in particular), which results in the kernel never sending these
messages out. This can lead to NEW_INTERFACE events being emitted with
a wiphy_id that had no corresponding NEW_WIPHY event emitted. Such a
sequence can confuse iwd's hardware detection logic, particularly during
hot-plug or system boot.
Fix this by re-dumping the wiphy if such a condition is detected. This
has some interaction with blacklisted wiphys, so the wiphy objects are
now always tracked and marked as blacklisted. Before, the blacklisted
wiphys were simply not added to the iwd list of tracked wiphys.
Read the driver name for each wiphy from sysfs if available. I didn't
find a better way to obtain the driver name for a phy than by reading
the dir name that the "driver" symlink points at. For an existing
netdev this can be done using the SIOCETHTOOL ioctl.
Let manager.c signal to wiphy.c when the wiphy parsing from the genl
messages is complete. When we query for existing wiphy using the
GET_WIPHY dump command we get many genl messages per wiphy, on a
notification we only get one message. So after wiphy_create there may
be one or many calls to wiphy_update_from_genl. wiphy_create_complete
is called after all of them, so wiphy.c can be sure it's done with
parsing the wiphy attributes when in prints the new wiphy summary log
message, like it did before manager.c was added.
I had wrongly assumed that all the important wiphy attributes were in
the first message in the dump, but NL80211_ATTR_EXT_FEATURES was not and
wasn't being parsed which was breaking at least testRSSIAgent.
wiphy_select_akm needed to be updated to take a flag, which can be
set to true if there are known reauth keys for this connection. If
we have reauth keys, and FILS is available we will choose it.
Add wiphy_create, wiphy_update_from_genl and wiphy_destroy that together
will let a new file command the wiphy creation, updates and deletion
with the same functionality the current config notification handler
implements in wiphy.c.
This is a replacement for station's static select_akm_suite. This was
done because wiphy can make a much more intellegent decision about the
akm suite by checking the wiphy supported features e.g. SAE support.
This allows a connection to hybrid WPA2/WPA3 AP's if SAE is not
supported in the kernel.
