In this situation the kernel is sending a low RSSI event which netdev
picks up, but since we set netdev->connected so early the event is
forwarded to station before IWD has fully connected. Station then
tries to get a neighbor report, which may fail and cause a known
frequency scan. If this is a new network the frequency scan tries to
get any known frequencies in network_info which will be unset and
cause a segfault.
This can be avoided by only sending RSSI events when netdev->operational
is set rather than netdev->connected.
It seems some APs send the IGTK key in big endian format (it is a
uin16). The kernel rightly reports an -EINVAL error when iwd issues a
NEW_KEY with such a value, resulting in the connection being aborted.
Work around this by trying to detect big-endian key indexes and 'fixing'
them up.
In order to support AlwaysRandomizeAddress and AddressOverride, station will
set the desired address into the handshake object. Then, netdev checks if
this was done and will use that address rather than generate one.
For privacy reasons its advantageous to randomize or mask
the MAC address when connecting to networks, especially public
networks.
This patch allows netdev to generate a new MAC address on a
per-network basis. The generated MAC will remain the same when
connecting to the same network. This allows reauthentications
or roaming to work, and not have to fully re-connect (which would
be required if the MAC changed on every connection).
Changing the MAC requires bringing the interface down. This does
lead to potential race conditions with respect to external
processes. There are two potential conditions which are explained
in a TODO comment in this patch.
This API was updated to take an extra boolean which will
automatically power up the device while changing the MAC
address. Since this is what IWD does anyways we can avoid
the need for an intermediate callback and go right into
netdev_initial_up_cb.
mac80211 drivers seem to send the disconnect event which is triggered by
CMD_DISCONNECT prior to the CMD_DISCONNECT response. However, some
drivers, namely brcmfmac, send the response first and then send the
disconnect event. This confused iwd when a connection was immediately
triggered after a disconnection (network switch operation).
Fix this by making sure that connected variable isn't set until the
connect event is actually processed, and ignore disconnect events which
come after CMD_DISCONNECT has alredy succeeded.
Allow netdev_create_from_genl callers to draw a random or non-random MAC
and pass it in the parameter instead of a bool to tell us to generating
the MAC locally. In P2P we are generating the MAC some time before
creating the netdev in order to pass it to the peer during negotiation.
It seems that the kernel uses -EOPNOTSUPP if the change_station
operation is not implemented by the driver. However, some drivers do
implement change_station and choose to report -ENOTSUPP instead of
-EOPNOTSUPP.
To add to the confusion, EOPNOTSUPP and -ENOTSUPP are the same on some
systems (e.g. Gentoo). Be paranoid and allow both errors to be ignored
when sending CMD_SET_STATION.
Fixes: 0238ffb8d9 ("netdev: Use -EOPNOTSUPP instead of -ENOTSUPP")
The kernel uses -EOPNOTSUPP in the case of change_station operation not
being provided. On most systems -EOPNOTSUPP is defined to be the same
as -ENOTSUPP, but seemingly not all systems.
Commit 1057d8aa74 changed the device interface creation logic
from being unconditional inside netdev.c to instead use NETDEV_WATCH_*
events. However, this broke the assumption that the device interface
was created before all others. The effect is that the scan_wdev_add
might no longer be called prior to station interface being created. Fix
this by moving scan_wdev_add/remove calls to netdev.c instead.
Fixes: 1057d8aa74 ("device: Move device creation from netdev.c to event watch")
Create and destroy the device state struct and the DBus interfaces in a
way more similar to the Station, AdHoc and AP interfaces. Drop
netdev_get_device() and the device specific code in netdev that as far
as I can tell wasn't needed.
netdev_connect can achieve the same effect as netdev_connect_wsc but is
more flexible as it allows us to supply additional association IEs. We
will need this capability to make P2P connections. This way we're also
moving the WSC-specific bits to wsc.c from the crowded netdev.c.
Convert the handshake event callback type to use variable argument
list to allow for more flexibility in event-specific arguments
passed to the callbacks.
Note the uint16_t reason code is promoted to an int when using variable
arguments so va_arg(args, int) has to be used.
Since iwd_modules_init is now defered until nl80211_appeared, we can
assume the nl80211 object is available. This removes the need for
netdev_set_nl80211 completely.
The QoS Map can come in either as a management frame or via the
Associate Response. In either case this IE simply needs to be
forwarded back to the kernel.
When performing a fast transition to another OPEN network the RSN
element won't be there and therefore the bss->rsne is gonna be NULL.
Fix crash by not accessing the rsne member when performing a fast
transition to an AP that doe snot advertise any RSN IE.
Crash caught with gdb:
src/station.c:station_transition_start() 186, target 34:8f:27:2f:b8:fc
Program received signal SIGSEGV, Segmentation fault.
handshake_state_set_authenticator_ie (s=0x555555626eb0, ie=0x0) at src/handshake.c:163
163 s->authenticator_ie = l_memdup(ie, ie[1] + 2u);
(gdb) bt
#0 handshake_state_set_authenticator_ie (s=0x555555626eb0, ie=0x0) at src/handshake.c:163
#1 0x0000555555561a98 in fast_transition (netdev=0x55555562fbe0, target_bss=0x55555561f4a0,
over_air=over_air@entry=true, cb=0x55555556d5b0 <station_fast_transition_cb>) at src/netdev.c:3164
#2 0x0000555555565dfd in netdev_fast_transition (netdev=<optimized out>, target_bss=<optimized out>,
cb=<optimized out>) at src/netdev.c:3232
#3 0x000055555556ccbd in station_transition_start (bss=0x55555561f4a0, station=0x555555617da0)
at src/station.c:1261
#4 station_roam_scan_notify (err=<optimized out>, bss_list=<optimized out>, userdata=0x555555617da0)
at src/station.c:1444
#5 0x0000555555579560 in scan_finished (sc=0x55555562bf80, err=err@entry=0, bss_list=0x55555561bd90,
sr=0x555555626b30, wiphy=<optimized out>) at src/scan.c:1234
#6 0x0000555555579620 in get_scan_done (user=0x555555618920) at src/scan.c:1264
#7 0x00005555555abd23 in destroy_request (data=0x55555561b000) at ell/genl.c:673
#8 0x00005555555ac129 in process_unicast (nlmsg=0x7fffffffc310, genl=0x55555560b7a0) at ell/genl.c:940
#9 received_data (io=<optimized out>, user_data=0x55555560b7a0) at ell/genl.c:1039
#10 0x00005555555a8aa3 in io_callback (fd=<optimized out>, events=1, user_data=0x55555560b840)
at ell/io.c:126
#11 0x00005555555a7ccd in l_main_iterate (timeout=<optimized out>) at ell/main.c:473
#12 0x00005555555a7d9c in l_main_run () at ell/main.c:520
#13 l_main_run () at ell/main.c:502
#14 0x00005555555a7fac in l_main_run_with_signal (callback=<optimized out>, user_data=0x0)
at ell/main.c:642
#15 0x000055555555e5b8 in main (argc=<optimized out>, argv=<optimized out>) at src/main.c:519
