This mispelling was present in the configuration, so I retained parsing
of the legacy BandModifier*Ghz options for compatibility. Without this
change anyone spelling GHz correctly in their configs would be very
confused.
Beacon loss handling was removed in the past because it was
determined that this even always resulted in a disconnect. This
was short sighted and not always true. The default kernel behavior
waits for 7 lost beacons before emitting this event, then sends
either a few nullfuncs or probe requests to the BSS to determine
if its really gone. If these come back successfully the connection
will remain alive. This can give IWD some time to roam in some
cases so we should be handling this event.
Since beacon loss indicates a very poor connection the roam scan
is delayed by a few seconds in order to give the kernel a chance
to send the nullfuncs/probes or receive more beacons. This may
result in a disconnect, but it would have happened anyways.
Attempting a roam mainly handles the case when the connection can
be maintained after beacon loss, but is still poor.
This is being done to allow the DPP module to work correctly. DPP
currently uses __station_connect_network incorrectly since it
does not (and cannot) change the state after calling. The only
way to connect with a state change is via station_connect_network
which requires a DBus method that triggered the connection; DPP
does not have this due to its potentially long run time.
To support DPP there are a few options:
1. Pass a state into __station_connect_network (this patch)
2. Support a NULL DBus message in station_connect_network. This
would require several NULL checks and adding all that to only
support DPP just didn't feel right.
3. A 3rd connect API in station which wraps
__station_connect_network and changes the state. And again, an
entirely new API for only DPP felt wrong (I guess we did this
for network_autoconnect though...)
Its about 50/50 between call sites that changed state after calling
and those that do not. Changing the state inside
__station_connect_network felt useful enough to cover the cases that
could benefit and the remaining cases could handle it easily enough:
- network_autoconnect(), and the state is changed by station after
calling so it more or less follows the same pattern just routes
through network. This will now pass the CONNECTING_AUTO state
from within network vs station.
- The disconnect/reconnect path. Here the state is changed to
ROAMING prior in order to avoid multiple state changes. Knowing
this the same ROAMING state can be passed which won't trigger a
state change.
- Retrying after a failed BSS. The state changes on the first call
then remains the same for each connection attempt. To support this
the current station->state is passed to avoid a state change.
The packet loss handler puts a higher priority on roaming compared
to the low signal roam path. This is generally beneficial since this
event usually indicates some problem with the BSS and generally is
an indicator that a disconnect will follow sometime soon.
But by immediately issuing a scan we run the risk of causing many
successive scans if more packet loss events arrive following
the roam scans (and if no candidates are found). Logs provided
further.
To help with this handle the first event with priority and
immediately issue a roam scan. If another event comes in within a
certain timeframe (2 seconds) don't immediately scan, but instead
rearm the roam timer instead of issuing a scan. This also handles
the case of a low signal roam scan followed by a packet loss
event. Delaying the roam will at least provide some time for packets
to get out in between roam scans.
Logs were snipped to be less verbose, but this cycled happened
5 times prior. In total 7 scans were issued in 5 seconds which may
very well have been the reason for the local disconnect:
Oct 27 16:23:46 src/station.c:station_roam_failed() 9
Oct 27 16:23:46 src/wiphy.c:wiphy_radio_work_done() Work item 29 done
Oct 27 16:23:47 src/netdev.c:netdev_mlme_notify() MLME notification Notify CQM(64)
Oct 27 16:23:47 src/station.c:station_packets_lost() Packets lost event: 10
Oct 27 16:23:47 src/station.c:station_roam_scan() ifindex: 9
Oct 27 16:23:47 src/wiphy.c:wiphy_radio_work_insert() Inserting work item 30
Oct 27 16:23:47 src/wiphy.c:wiphy_radio_work_next() Starting work item 30
Oct 27 16:23:47 src/station.c:station_start_roam() Using cached neighbor report for roam
Oct 27 16:23:47 src/scan.c:scan_notify() Scan notification Trigger Scan(33)
Oct 27 16:23:47 src/scan.c:scan_request_triggered() Active scan triggered for wdev a
Oct 27 16:23:47 src/scan.c:scan_notify() Scan notification New Scan Results(34)
Oct 27 16:23:47 src/netdev.c:netdev_link_notify() event 16 on ifindex 9
... scan results ...
Oct 27 16:23:47 src/station.c:station_roam_failed() 9
Oct 27 16:23:47 src/wiphy.c:wiphy_radio_work_done() Work item 30 done
Oct 27 16:23:47 src/netdev.c:netdev_mlme_notify() MLME notification Notify CQM(64)
Oct 27 16:23:47 src/station.c:station_packets_lost() Packets lost event: 10
Oct 27 16:23:47 src/station.c:station_roam_scan() ifindex: 9
Oct 27 16:23:47 src/wiphy.c:wiphy_radio_work_insert() Inserting work item 31
Oct 27 16:23:47 src/wiphy.c:wiphy_radio_work_next() Starting work item 31
Oct 27 16:23:47 src/station.c:station_start_roam() Using cached neighbor report for roam
Oct 27 16:23:47 src/scan.c:scan_notify() Scan notification Trigger Scan(33)
Oct 27 16:23:47 src/scan.c:scan_request_triggered() Active scan triggered for wdev a
Oct 27 16:23:48 src/scan.c:scan_notify() Scan notification New Scan Results(34)
Oct 27 16:23:48 src/netdev.c:netdev_link_notify() event 16 on ifindex 9
... scan results ...
Oct 27 16:23:48 src/station.c:station_roam_failed() 9
Oct 27 16:23:48 src/wiphy.c:wiphy_radio_work_done() Work item 31 done
Oct 27 16:23:48 src/netdev.c:netdev_mlme_notify() MLME notification Notify CQM(64)
Oct 27 16:23:48 src/station.c:station_packets_lost() Packets lost event: 10
Oct 27 16:23:48 src/station.c:station_roam_scan() ifindex: 9
Oct 27 16:23:48 src/wiphy.c:wiphy_radio_work_insert() Inserting work item 32
Oct 27 16:23:48 src/wiphy.c:wiphy_radio_work_next() Starting work item 32
Oct 27 16:23:48 src/station.c:station_start_roam() Using cached neighbor report for roam
Oct 27 16:23:48 src/scan.c:scan_notify() Scan notification Trigger Scan(33)
Oct 27 16:23:48 src/scan.c:scan_request_triggered() Active scan triggered for wdev a
Oct 27 16:23:49 src/netdev.c:netdev_link_notify() event 16 on ifindex 9
Oct 27 16:23:49 src/netdev.c:netdev_mlme_notify() MLME notification Del Station(20)
Oct 27 16:23:49 src/netdev.c:netdev_mlme_notify() MLME notification Deauthenticate(39)
Oct 27 16:23:49 src/netdev.c:netdev_deauthenticate_event()
Oct 27 16:23:49 src/netdev.c:netdev_mlme_notify() MLME notification Disconnect(48)
Oct 27 16:23:49 src/netdev.c:netdev_disconnect_event()
Oct 27 16:23:49 Received Deauthentication event, reason: 4, from_ap: false
If netconfig is canceled before completion (when roaming) the
settings are freed and never loaded again once netconfig is started
post-roam. Now after a roam make sure to re-load the settings and
start netconfig.
Commit 23f0f5717c did not correctly handle the reassociation
case where the state is set from within station_try_next_transition.
If IWD reassociates netconfig will get reset and DHCP will need to
be done over again after the roam. Instead get the state ahead of
station_try_next_transition.
Fixes: 23f0f5717c ("station: allow roaming before netconfig finishes")
For IWD to work correctly either 2.4GHz or 5GHz bands must be enabled
(even for 6GHz to work). Check this and don't allow IWD to initialize
if both 2.4 and 5GHz is disabled.
The function wiphy_band_is_disabled() return was a bit misleading
because if the band was not supported it would return true which
could be misunderstood as the band is supported, but disabled.
There was only one call site and because of this behavior
wiphy_band_is_disabled needed to be paired with checking if the
band was supported.
To be more descriptive to the caller, wiphy_band_is_disabled() now
returns an int and if the band isn't supported -ENOTSUP will be
returned, otherwise 1 is returned if the band is disabled and 0
otherwise.
This adds support to allow users to disable entire bands, preventing
scanning and connecting on those frequencies. If the
[Rank].BandModifier* options are set to 0.0 it will imply those
bands should not be used for scanning, connecting or roaming. This
now applies to autoconnect, quick, hidden, roam, and dbus scans.
This is a station only feature meaning other modules like RRM, DPP,
WSC or P2P may still utilize those bands. Trying to limit bands in
those modules may sometimes conflict with the spec which is why it
was not added there. In addition modules like DPP/WSC are only used
in limited capacity for connecting so there is little benefit gained
to disallowing those bands.
The auth/action status is now tracked in ft.c. If an AP rejects the
FT attempt with "Invalid PMKID" we can now assume this AP is either
mis-configured for FT or is lagging behind getting the proper keys
from neighboring APs (e.g. was just rebooted).
If we see this condition IWD can now fall back to reassociation in
an attempt to still roam to the best candidate. The fallback decision
is still rank based: if a BSS fails FT it is marked as such, its
ranking is reset removing the FT factor and it is inserted back
into the queue.
The motivation behind this isn't necessarily to always force a roam,
but instead to handle two cases where IWD can either make a bad roam
decision or get 'stuck' and never roam:
1. If there is one good roam candidate and other bad ones. For
example say BSS A is experiencing this FT key pull issue:
Current BSS: -85dbm
BSS A: -55dbm
BSS B: -80dbm
The current logic would fail A, and roam to B. In this case
reassociation would have likely succeeded so it makes more sense
to reassociate to A as a fallback.
2. If there is only one candidate, but its failing FT. IWD will
never try anything other than FT and repeatedly fail.
Both of the above have been seen on real network deployments and
result in either poor performance (1) or eventually lead to a full
disconnect due to never roaming (2).
The PMKID derivation has gotten messy due to the spec
updating/clarifying the hash size for the FT-8021X AKM. This
has led to hostapd updating the derivation which leaves older
hostapd versions using SHA1 and newer versions using SHA256.
To support this the checksum type is being fed to
handshake_state_get_pmkid so the caller can decide what sha to
use. In addition handshake_state_pmkid_matches is being added
which uses get_pmkid() but handles sorting out the hash type
automatically.
This lets preauthentication use handshake_state_get_pmkid where
there is the potential that a new PMKID is derived and eapol
can use handshake_state_pmkid_matches which only derives the
PMKID to compare against the peers.
If IWD connects under bad RF conditions and netconfig takes
a while to complete (e.g. slow DHCP), the roam timeout
could fire before DHCP is done. Then, after the roam,
IWD would transition automatically to connected before
DHCP was finished. In theory DHCP could still complete after
this point but any process depending on IWD's connected
state would be uninformed and assume IP networking is up.
Fix this by stopping netconfig prior to a roam if IWD is not
in a connected state. Then, once the roam either failed or
succeeded, start netconfig again.
Use a more appropriate printf conversion string in order to avoid
unnecessary implicit conversion which can lead to a buffer overflow.
Reasons similar to commit:
98b758f893 ("knownnetworks: fix printing SSID in hex")
In the case that the FT target is on the same channel as we're currently
operating on, use ft_authenticate_onchannel instead of ft_authenticate.
Going offchannel in this case can confuse some drivers.
Past commits should address any potential problems of the timer
firing during FT, but its still good practice to cancel the timer
once it is no longer needed, i.e. once FT has started.
If station has already started FT ensure station_cannot_roam takes
that into account. Since the state has not yet changed it must also
check if the FT work ID is set.
Under the following conditions IWD can accidentally trigger a second
roam scan while one is already in progress:
- A low RSSI condition is met. This starts the roam rearm timer.
- A packet loss condition is met, which triggers a roam scan.
- The roam rearm timer fires and starts another roam scan while
also overwriting the first roam scan ID.
- Then, if IWD gets disconnected the overwritten roam scan gets
canceled, and the roam state is cleared which NULL's
station->connected_network.
- The initial roam scan results then come in with the assumption
that IWD is still connected which results in a crash trying to
reference station->connected_network.
This can be fixed by adding a station_cannot_roam check in the rearm
timer. If IWD is already doing a roam scan station->preparing_roam
should be set which will cause it to return true and stop any further
action.
Aborting (signal 11) [/usr/libexec/iwd]
iwd[426]: ++++++++ backtrace ++++++++
iwd[426]: #0 0x7f858d7b2090 in /lib/x86_64-linux-gnu/libc.so.6
iwd[426]: #1 0x443df7 in network_get_security() at ome/locus/workspace/iwd/src/network.c:287
iwd[426]: #2 0x421fbb in station_roam_scan_notify() at ome/locus/workspace/iwd/src/station.c:2516
iwd[426]: #3 0x43ebc1 in scan_finished() at ome/locus/workspace/iwd/src/scan.c:1861
iwd[426]: #4 0x43ecf2 in get_scan_done() at ome/locus/workspace/iwd/src/scan.c:1891
iwd[426]: #5 0x4cbfe9 in destroy_request() at ome/locus/workspace/iwd/ell/genl.c:676
iwd[426]: #6 0x4cc98b in process_unicast() at ome/locus/workspace/iwd/ell/genl.c:954
iwd[426]: #7 0x4ccd28 in received_data() at ome/locus/workspace/iwd/ell/genl.c:1052
iwd[426]: #8 0x4c79c9 in io_callback() at ome/locus/workspace/iwd/ell/io.c:120
iwd[426]: #9 0x4c62e3 in l_main_iterate() at ome/locus/workspace/iwd/ell/main.c:476
iwd[426]: #10 0x4c6426 in l_main_run() at ome/locus/workspace/iwd/ell/main.c:519
iwd[426]: #11 0x4c6752 in l_main_run_with_signal() at ome/locus/workspace/iwd/ell/main.c:645
iwd[426]: #12 0x405987 in main() at ome/locus/workspace/iwd/src/main.c:600
iwd[426]: #13 0x7f858d793083 in /lib/x86_64-linux-gnu/libc.so.6
iwd[426]: +++++++++++++++++++++++++++
Rekeys for station mode don't need to know when complete since
there is nothing to do once done. AP mode on the other hand needs
to know if the rekey was successful in order to reset/set the next
rekey timer.
IWD was optimizing FT-over-DS by authenticating to multiple BSS's
at the time of connecting which then made future roams slightly
faster since they could jump right into association. So far this
hasn't posed a problem but it was reported that some AP's actually
enforce a reassociation timeout (included in 4-way handshake).
Hostapd itself does no such enforcement but anything external to
hostapd could monitor FT events and clear the cache if any exceeded
this timeout.
For now remove the early action frames and treat FT-over-DS the
same as FT-over-Air. In the future we could parse the reassociation
timeout, batch out FT-Action frames and track responses but for the
time being this just fix the issue at a small performance cost.
The previous commit added an invocation of known_networks_watch_add, but
never updated the module dependency graph.
Fixes: a793a41662 ("station, eapol: Set up eap-tls-common for session caching")
Use eap_set_peer_id() to set a string identifying the TLS server,
currently the hex-encoded SSID of the network, to be used as group name
and primary key in the session cache l_settings object. Provide pointers
to storage_eap_tls_cache_{load,sync} to eap-tls-common.c using
eap_tls_set_session_cache_ops(). Listen to Known Network removed
signals and call eap_tls_forget_peer() to have any session related to
the network also dropped from the cache.
The known frequency list may include frequencies that once were
allowed but are now disabled due to regulatory restrictions. Don't
include these frequencies in the roam scan.
These events are sent if IWD fails to authentiate
(ft-over-air-roam-failed) or if it falls back to over air after
failing to use FT-over-DS (try-ft-over-air)
If IPv4 setup fails and the netconfig logic gives up, continue as if the
connection had failed at earlier stages so that autoconnect can try the
next available network.
AP roaming was structured such that any AP roam request would
force IWD to roam (assuming BSS's were found in scan results).
This isn't always the best behavior since IWD may be connected
to the best BSS in range.
Only force a roam if the AP includes one of the 3 disassociation/
termination bits. Otherwise attempt to roam but don't set the
ap_directed_roaming flag which will allows IWD to stay with the
current BSS if no better candidates are found.
There are a few checks that can be done prior to parsing the
request, in addition the explicit check for preparing_roam was
removed since this is taken care of by station_cannot_roam().
This both adds proper handling to the new roaming logic and fixes
a potential bug with firmware roams.
The new way roaming works doesn't use a connect callback. This
means that any disconnect event or call to netdev_connect_failed
will result in the event handler being called, where before the
connect callback would. This means we need to handle the ROAMING
state in the station disconnect event so IWD properly disassociates
and station goes out of ROAMING.
With firmware roams netdev gets an event which transitions station
into ROAMING. Then netdev issues GET_SCAN. During this time a
disconnect event could come in which would end up in
station_disconnect_event since there is no connect callback. This
needs to be handled the same and let IWD transition out of the
ROAMING state.
This converts station to using ft_action/ft_authenticate and
ft_associate and dropping the use of the netdev-only/auth-proto
logic.
Doing this allows for more flexibility if FT fails by letting
IWD try another roam candidate instead of disconnecting.
The current behavior is to only find the best roam candidate, which
generally is fine. But if for whatever reason IWD fails to roam it
would be nice having a few backup BSS's rather than having to
re-scan, or worse disassociate and reconnect entirely.
This patch doesn't change the roam behavior, just prepares for
using a roam candidate list. One difference though is any roam
candidates are added to station->bss_list, rather than just the
best BSS. This shouldn't effect any external behavior.
The candidate list is built based on scan_bss rank. First we establish
a base rank, the rank of the current BSS (or zero if AP roaming). Any
BSS in the results with a higher rank, excluding the current BSS, will
be added to the sorted station->roam_bss_list (as a new 'roam_bss'
entry) as well as stations overall BSS list. If the resulting list is
empty there were no better BSS's, otherwise station can now try to roam
starting with the best candidate (head of the roam list).
There may be situations (due to Multi-BSS operation) where an AP might
be advertising multiple SSIDs on the same BSSID. It is thus more
correct to lookup the preauthentication target on the network object
instead of the station bss_list. It used to be that the network list of
bsses was not updated when roam scan was performed. Hence the lookup
was always performed on the station bss_list. But this is no longer the
case, so it is safer to lookup on the network object directly on the
network.
FT is now driven (mostly) by station which removes the connect
callback. Instead once FT is completed, keys set, etc. netdev
will send an event to notify station.
This will make the debug API more robust as well as fix issues
certain drivers have when trying to roam. Some of these drivers
may flush scan results after CMD_CONNECT which results in -ENOENT
when trying to roam with CMD_AUTHENTICATE unless you rescan
explicitly.
Now this will be taken care of automatically and station will first
scan for the BSS (or full scan if not already in results) and
attempt to roam once the BSS is seen in a fresh scan.
The logic to replace the old BSS object was factored out into its
own function to be shared by the non-debug roam scan. It was also
simplified to just update the network since this will remove the
old BSS if it exists.
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.
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.
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.
Ronan Pigott