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.
DBus has certain rules on what constitutes a valid path. Since the
wiphy name is freeform, it is possible to set it such that the contents
do not contain a valid path.
We fall back to simply using the wiphy index as the path.
DBus strings must be valid utf8. The kernel only enforces that the
wiphy name is null terminated string. It does not validate or otherwise
check the contents in any way. Thus it is possible to have
non-printable or non-utf8 characters inside.
NL80211_CMD_SET_WIPHY can be used to set various attributes on the wiphy
object in the kernel. This includes ATTR_WIPHY_NAME among others. iwd
currently does not parse or store any of the other attributes, so we
react to changes in WIPHY_NAME only.
The wiphy attribute should never be repeated by the kernel, so this
check is ultimately not needed. This condition can also be easily
checked by looking at the iwmon output in case things do go terribly
wrong.
James Prestwood