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.
The extended capability bits were not being set properly inside
wiphy. Since we build the IE after the wiphy dump the first 2
bytes are the IE type and length. The way we were setting the bits
did not take this into account and were actually setting the
completely wrong bits.
Some capability bits are required by the spec to be set for
probe requests for certain features (HS20, FILS, FT). Currently
these features work as-is, but depending on the hardware we may
be in violation of the spec if we assume the correct bits are
set when we get the wiphy dump.
Just to be safe we can explicity set these capability bits.
There are also two ways the kernel exposes these capabilities.
Per-type or globally. The hardware may expose one, or both of
these capability arrays. To combat this we are now always
creating a per-type capability array for stations. If the
wiphy dump has not produced a per-type capability array we
now create one based off the global capability array. That
way we can always assume there is a capability array for a
station iftype.
Regulatory domain management is now completely handled by the kernel, so
iwd doesn't really need to query or be aware of changes to this. This
may change in the future, but for now this code has not been used and
can be safely gotten rid of.
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.
As mentioned in code comments the name is NUL-terminated so there's no
need to return the length path, which was ignored in some occasions
anyway. Consistently treat it as NUL-terminated but also validate.
wiphy_select_akm will now check if BIP is supported, and if MFPR is
set in the scan_bss before returning either SAE AKMs. This will allow
fallback to another PSK AKM (e.g. hybrid APs) if any of the requirements
are not met.
Also add a mask parameter to wiphy_get_supported_iftypes to make sure
the SupportedModes property only contains the values that can be used
as Device.Mode.
dbus_iftype_to_string returns NULL for unknown iftypes, the strdup will
also return NULL and ret[i] will be assigned a NULL. As a result
the l_strjoinv will not print the known iftypes that might have come
after that and will the l_strfreev will leak the strduped strings.
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.
