Essentially exposes (and renames) netdev_ft_tx_associate in order to
be called similarly to netdev_reassociate/netdev_connect where a
connect callback can be provided. This will fix the current bug where
if association times out during FT IWD will hang and never transition
to disconnected.
This also removes the calling of the FT_ROAMED event and instead just
calls the connect callback (since its now set). This unifies the
callback path for reassociation and FT roaming.
iov_ie_append assumed that a single IE was being added and thus the
length of the IE could be extracted directly from the element. However,
iov_ie_append was used on buffers which could contain multiple IEs
concatenated together, for example in handshake_state::vendor_ies. Most
of the time this was safe since vendor_ies was NULL or contained a
single element, but would result in incorrect behavior in the general
case. Fix that by changing iov_ie_append signature to take an explicit
length argument and have the caller specify whether the element is a
single IE or multiple.
Fixes: 7e9971661bcb ("netdev: Append any vendor IEs from the handshake")
ssid is declared as a 32 byte field in handshake_state, hence using it
as a string which is assumed to be nul-terminated will fail for SSIDs
that are 32 bytes long.
Fixes: 1f1478285725 ("wiphy: add _generate_address_from_ssid")
Fixes: 5a1b1184fca6 ("netdev: support per-network MAC addresses")
In netdev_retry_owe, if l_gen_family_send fails, the connect_cmd is
never freed or reset. Fix that.
While here, use a stack variable instead of netdev member, since the use
of such a member is unnecessary and confusing.
vendor_ies stored in handshake_state are already added as part of
netdev_populate_common_ies(), which is already invoked by
netdev_build_cmd_connect().
Normally vendor_ies is NULL for OWE connections, so no IEs are
duplicated as a result.
Very rarely on ath10k (potentially other ath cards), disabling
power save while the interface is down causes a timeout when
bringing the interface back up. This seems to be a race in the
driver or firmware but it causes IWD to never start up properly
since there is no retry logic on that path.
Retrying is an option, but a more straight forward approach is
to just reorder the logic to set power save off after the
interface is already up. If the power save setting fails we can
just log it, ignore the failure, and continue. From a users point
of view there is no real difference in doing it this way as
PS still gets disabled prior to IWD connecting/sending data.
Changing behavior based on a buggy driver isn't something we
should be doing, but in this instance the change shouldn't have
any downside and actually isn't any different than how it has
been done prior to the driver quirks change (i.e. use network
manager, iw, or iwconfig to set power save after IWD starts).
For reference, this problem is quite rare and difficult to say
exactly how often but certainly <1% of the time:
iwd[1286641]: src/netdev.c:netdev_disable_ps_cb() Disabled power save for ifindex 54
kernel: ath10k_pci 0000:02:00.0: wmi service ready event not received
iwd[1286641]: Error bringing interface 54 up: Connection timed out
kernel: ath10k_pci 0000:02:00.0: Could not init core: -110
After this IWD just sits idle as it has no interface to start using.
This is even reproducable outside of IWD if you loop and run:
ip link set <wlan> down
iw dev <wlan> set power_save off
ip link set <wlan> up
Eventually the 'up' command will fail with a timeout.
I've brought this to the linux-wireless/ath10k mailing list but
even if its fixed in future kernels we'd still need to support
older kernels, so a workaround/change in IWD is still required.
Commit c59669a366c5 ("netdev: disambiguate between disconnection types")
introduced different paths for different types of disconnection
notifications from netdev. Formalize this further by having
netdev_connect_failed only invoke connect_cb.
Disconnections that could be triggered outside of connection
related events are now handled on a different code path. For this
purpose, netdev_disconnected() is introduced.
When a roam event is received, iwd generates a firmware scan request and
notifies its event filter of the ROAMING condition. In cases where the
firmware scan could not be started successfully, netdev_connect_failed
is invoked. This is not a correct use of netev_connect_failed since it
doesn't actually disconnect the underlying netdev and the reflected
state becomes de-synchronized from the underlying kernel device.
The firmware scan request could currently fail for two reasons:
1. nl80211 genl socket is in a bad state, or
2. the scan context does not exist
Since both reasons are highly unlikely, simply use L_WARN instead.
The other two cases where netdev_connect_failed is used could only occur
if the kernel message is invalid. The message is ignored in that case
and a warning is printed.
The situation described above also exists in netdev_get_fw_scan_cb. If
the scan could not be completed successfully, there's not much iwd can
do to recover. Have iwd remain in roaming state and print an error.
There are generally three scenarios where iwd generates a disconnection
command to the kernel:
1. Error conditions stemming from a connection related event. For
example if SAE/FT/FILS authentication fails during Authenticate or
Associate steps and the kernel doesn't disconnect properly.
2. Deauthentication after the connection has been established and not
related to a connection attempt in progress. For example, SA Query
processing that triggers an disconnect.
3. Disconnects that are triggered due to a handshake failure or if
setting keys resulting from the handshake fails. These disconnects
can be triggered as a result of a pending connection or when a
connection has been established (e.g. due to rekeying).
Distinguish between 1 and 2/3 by having the disconnect procedure take
different paths. For now there are no functional changes since all
paths end up in netdev_connect_failed(), but this will change in the
future.
While here, also get rid of netdev_del_station. The only user of this
function was in ap.c and it could easily be replaced by invoking the new
nl80211_build_del_station function. The callback used by
netdev_build_del_station only printed an error and didn't do anything
useful. Get rid of it for now.
netdev_begin_connection() already invokes netdev_connect_failed on
error. Remove any calls to netdev_connect_failed in callers of
netdev_begin_connection().
Fixes: 4165d9414f54 ("netdev: use wiphy radio work queue for connections")
If netdev_get_oci fails, a goto deauth is invoked in order to terminate
the current connection and return an error to the caller. Unfortunately
the deauth label builds CMD_DEAUTHENTICATE in order to terminate the
connection. This was fine because it used to handle authentication
protocols that ran over CMD_AUTHENTICATE and CMD_ASSOCIATE. However,
OCI can also be used on FullMAC hardware that does not support them.
Use CMD_DISCONNECT instead which works everywhere.
Fixes: 06482b811626 ("netdev: Obtain operating channel info")
The reason code field was being obtained as a uint8_t value, while it is
actually a uint16_t in little-endian byte order.
Fixes: f3cc96499c44 ("netdev: added support for SA Query")
The reason code from deauthentication frame was being obtained as a
uint8_t instead of a uint16_t. The value was only ever used in an
informational statement. Since the value was in little endian, only the
first 8 bits of the reason code were obtained. Fix that.
Fixes: 2bebb4bdc7ee ("netdev: Handle deauth frames prior to association")
Some APs don't include the RSNE in the associate reply during
the OWE exchange. This causes IWD to be incompatible since it has
a hard requirement on the AKM being included.
This relaxes the requirement for the AKM and instead warns if it
is not included.
Below is an example of an association reply without the RSN element
IEEE 802.11 Association Response, Flags: ........
Type/Subtype: Association Response (0x0001)
Frame Control Field: 0x1000
.000 0000 0011 1100 = Duration: 60 microseconds
Receiver address: 64:c4:03:88:ff:26
Destination address: 64:c4:03:88:ff:26
Transmitter address: fc:34:97:2b:1b:48
Source address: fc:34:97:2b:1b:48
BSS Id: fc:34:97:2b:1b:48
.... .... .... 0000 = Fragment number: 0
0001 1100 1000 .... = Sequence number: 456
IEEE 802.11 wireless LAN
Fixed parameters (6 bytes)
Tagged parameters (196 bytes)
Tag: Supported Rates 6(B), 9, 12(B), 18, 24(B), 36, 48, 54, [Mbit/sec]
Tag: RM Enabled Capabilities (5 octets)
Tag: Extended Capabilities (11 octets)
Ext Tag: HE Capabilities (IEEE Std 802.11ax/D3.0)
Ext Tag: HE Operation (IEEE Std 802.11ax/D3.0)
Ext Tag: MU EDCA Parameter Set
Ext Tag: HE 6GHz Band Capabilities
Ext Tag: OWE Diffie-Hellman Parameter
Tag Number: Element ID Extension (255)
Ext Tag length: 51
Ext Tag Number: OWE Diffie-Hellman Parameter (32)
Group: 384-bit random ECP group (20)
Public Key: 14ba9d8abeb2ecd5d95e6c12491b16489d1bcc303e7a7fbd…
Tag: Vendor Specific: Broadcom
Tag: Vendor Specific: Microsoft Corp.: WMM/WME: Parameter Element
Reported-By: Wen Gong <quic_wgong@quicinc.com>
Tested-By: Wen Gong <quic_wgong@quicinc.com>
Disable power save if the wiphy indicates its needed. Do this
before issuing GET_LINK so the netdev doesn't signal its up until
power save is disabled.
In try_handshake_complete() we return early if all the keys had
been installed before (initial associations). For rekeys we can
now emit the REKEY_COMPLETE event which lets AP mode reset the
rekey timer for that station.
When the TK is installed the 'ptk_installed' flag was never set to
zero. For initial associations this was fine (already zero) but for
rekeys the flag needs to be unset so try_handshake_complete knows
if the key was installed. This is consistent with how gtk/igtk keys
work as well.
The netdev_copy_tk function was being hard coded with authenticator
set to false. This isn't important for any ciphers except TKIP but
now that AP mode supports TKIP it needs to be fixed.
Both CMD_ASSOCIATE and CMD_CONNECT paths were using very similar code to
build RSN specific attributes. Use a common function to build these
attributes to cut down on duplicated code.
While here, also start using ie_rsn_cipher_suite_to_cipher instead of
assuming that the pairwise / group ciphers can only be CCMP or TKIP.
This finalizes the refactor by moving all the handshake prep
into FT itself (most was already in there). The netdev-specific
flags and state were added into netdev_ft_tx_associate which
now avoids any need for a netdev API related to FT.
The NETDEV_EVENT_FT_ROAMED event is now emitted once FT completes
(netdev_connect_ok). This did require moving the 'in_ft' flag
setting until after the keys are set into the kernel otherwise
netdev_connect_ok has no context as to if this was FT or some
other connection attempt.
In addition the prev_snonce was removed from netdev. Restoring
the snonce has no value once association begins. If association
fails it will result in a disconnect regardless which requires
a new snonce to be generated
This forwards Action, Authentication and Association frames to
ft.c via their new hooks in netdev.
Note that this will break FT-over-Air temporarily since the
auth-proto still is in use.
Currently netdev handles caching FT auth information and uses FT
parsers/auth-proto to manage the protocol. This sets up to remove
this state machine from netdev and isolate it into ft.c.
This does not break the existing auth-proto (hence the slight
modifications, which will be removed soon).
Eventually the auth-proto will be removed from FT entirely, replaced
just by an FT state machine, similar to how EAPoL works (netdev hooks
to TX/RX frames).
The warnings in the authenticate and connect events were identical
so it could be difficult knowing which print it was if IWD is not
in debug mode (to see more context). The prints were changed to
indicate which event it was and for the connect event the reason
attribute is also parsed.
Note the resp_ies_len is also initialized to zero now. After making
the changes gcc was throwing a warning.
