This indication can come in via EAPoL message 3 or during
FILS Association. It carries information as to whether certain
transition mode options should be disabled. See WPA3 Specification,
version 3 for more details.
Some network settings keys are set / parsed in multiple files. Add a
utility to parse all common network configuration settings in one place.
Also add some defines to make sure settings are always saved in the
expected group/key.
This returns the length of the actual contents, making the code a bit
easier to read and avoid the need to mask the KDE value which isn't
self-explanatory.
Instead of requiring each auth_proto to perform validation of the frames
received via rx_authenticate & rx_associate, have netdev itself perform
the mpdu validation. This is unlikely to happen anyway since the kernel
performs its own frame validation. Print a warning in case the
validation fails.
There's no reason why a change in groups would result in the
anti-clogging token becoming invalid. This might result in us needing
an extra round-trip if the peer is using countermeasures and our
requested group was deemed unsuitable.
We may receive multiple anti-clogging request messages. We memdup the
token every time, without checking whether memory for one has already
been allocated. Free the old token prior to allocating a new one.
The group was not checked at all. The specification doesn't
mention doing so specifically, but we are only likely to receive an Anti
Clogging Token Request message once we have sent our initial Commit. So
the group should be something we could have sent or might potentially be
able to use.
In case an exceptional condition occurs, handle this more consistently
by returning the following errors:
-ENOMSG -- If a message results in the retransmission timer t0 being
restarted without actually sending anything.
-EBADMSG -- If a received message is to be silently discarded without
affecting the t0 timer.
-ETIMEDOUT -- If SYNC_MAX has been exceeded
-EPROTO -- If a fatal protocol error occurred
Now that sae_verify_* methods no longer allow dropped frames though,
there's no reason to keep these checks. sae_process_commit and
sae_process_confirm will now always receive messages in their respective
state.
sae_verify_* functions were correctly marking frames to be dropped, but
were returning 0, which caused the to-be-dropped frames to be further
processed inside sae_rx_authenticate. Fix that by returning a proper
error.
Make sure to return -EAGAIN whenever a received frame from the peer
results in a retransmission. This also prevents the frame from being
mistakenly processed further in sae_rx_authenticate.
Do not try to transition to a new state from sae_send_commit /
sae_send_confirm since these methods can be called due to
retransmissions or other unexpected messages. Instead, transition to
the new state explicitly from sae_process_commit / sae_process_confirm.
SAE protocol is meant to authenticate peers simultaneously. Hence it
includes a tie-breaker provision in case both peers enter into the
Committed state and the Commit messages arrive at the respective peers
near simultaneously.
However, in the case of STA or Infrastructure mode, only one peer (STA)
would normally enter the Committed state (via Init) and the tie-breaker
provision is not needed. If this condition is detected, abort the
connection.
Also remove the uneeded group change check in process_commit.
sae_compute_pwe doesn't really depend on the state of sae_sm. Only the
curve to be used for the PWE calculation is needed. Rework the function
signature to reflect that and remove unneeded member of struct sae_sm.
ie_tlv_builder_init takes a size_t as input, yet for some reason
ie_tlv_builder_finalize takes an unsigned int argument as output. Fix
the latter to use size_t as well.
During processing of Connect events by netdev, some of these elements
might be updated even when already set. Instead of issuing
l_free/l_memdup each time, check and see whether the elements are
bitwise identical first.
Returns a template RSNX element that can be further modified by callers
to set any additional capabilities if required. wiphy will fill in
those capabilities that are driver / firmware dependent.
Most parameters set into the handshake object are actually known by the
network object itself and not station. This includes address
randomization settings, EAPoL settings, passphrase/psk/8021x settings,
etc. Since the number of these settings will only keep growing, move
the handshake setup into network itself. This also helps keep network
internals better encapsulated.
Refactor network_sync_psk to not require setting attributes into
multiple settings objects. This is in fact unnecessary as the parsed
security parameters are used everywhere else instead. Also make sure to
wipe the [Security] group first, in case any settings were invalid
during loading or otherwise invalidated.
Credentials obtained can now be either in passphrase or PSK form. Prior
to commit 7a9891dbef, passphrase credentials were always converted to
PSK form by invoking crypto_psk_from_passphrase. This was changed in
order to support WPA3 networks. Unfortunately the provisioning logic
was never properly updated. Fix that, and also try to not overwrite any
existing settings in case WSC is providing credentials for networks that
are already known.
Fixes: 7a9891dbef ("wsc: store plain text passphrase if available")
There will be additional security-related settings that will be
introduced for settings files. In particular, Hash-to-Curve PT
elements, Transition Disable settings and potentially others in the
future. Since PSK is now not the only element that would require
update, rename this function to better reflect this.
PRF+ from RFC 5295 is the more generic function using which HKDF_Expand
is defined. Allow this function to take a vararg list of arguments to
be hashed (these are referred to as 'S' in the RFCs).
Implement hkdf_expand in terms of prf_plus and update all uses to the
new syntax.
This fixes an issue where the udp port was not being opened due to a
permission denied error. The result of this was the dhcp client would
fail to send the renewal request and so the dhcp lease would expire.
The addition of the CAP_NET_BIND_SERVICE capability allows the service
to open sockets in the restricted port range (<1024) which is required
for dhcp.
This is based on a previous patch by Roberto Santalla Fernández.
A new config is introduced into the network config file under IPv4
called SendHostname. If this is set to true then we add the hostname
into all DHCP requests. The default is false.
If the idea is that the interface should only be present when connected
then don't do this in the DISCONNECTING state as there are various
possible transitions from CONNECTED or ROAMING directly to DISCONNECTED.
Don't require a gateway address from the settings file or from the DHCP
server when doing netconfig. Failing when the gateway address was
missing was breaking P2P but also small local networks.
Be paranoid and check that the prefix length in addresses from
used_addr4_list are not zero (they shouldn't be) and that address family
is AF_INET (it should be), mainly to quiet coverity warnings:
While there also fix one line's indentation.
At the end of ip_pool_select_addr4() we'd check if the selected address
is equal to the subnet address and increment it by 1 to produce a valid
host address for the AP. That check was always correct only with 24-bit
prefix, extend it to actually use the prefix-dependent mask instead of
0xff. Fixes a testAP failure triggered 50% of the times because the
netmask is 28 bit long there.
Don't signal the connected state until the client has obtained a DHCP
lease and we can set the ConnectedIP property. From now on that
property is always set when there's a connection.
p2p_parse_association_req() already extracts the P2P IE payload from the
IE sequence, there's no need to call ie_tlv_extract_p2p_payload before
it. Pass the IE sequence directly to p2p_parse_association_req().
Similarly to commit
27d302a0 ("band: Add a utility to estimate VHT rx data rate"), this
commit adds an RX data rate estimation utility for HT connections.
This function is meant to supercede a similar function in ie.c. The
current approach results in very optimistic data rate estimates since it
only takes into account the VHT/HT Capabilities IEs. It does not take
into account any local hardware limitations (such as no VHT/HT support),
limited RX MCS sets & number of spatial streams. It also does not take
into account that the AP might not be actually operating on higher
bandwidth channels.
This function is meant to address that by matching peer TX MCS sets with
the local hardware RX MCS set capability. It also takes into account
channel bandwidth capabilities of the local hardware, as well as whether
the AP is actually operating on a wider channel.
Move the band definition out of wiphy.c and into band.[ch]. This is
done to make certain utilities that depend on band information capable
of being tested from unit tests.
The band concept will most likely grow over time. For now, the only
user will be wiphy.c and unit tests, so the structures are kept public.
It is possible that the address set command succeeds just after a
netconfig object has been destroyed.
==6485== Invalid read of size 8
==6485== at 0x458A6D: netconfig_ipv4_routes_install (netconfig.c:629)
==6485== by 0x458D1C: netconfig_ipv4_ifaddr_add_cmd_cb (netconfig.c:689)
==6485== by 0x4A5E7B: process_message (netlink.c:181)
==6485== by 0x4A626A: can_read_data (netlink.c:289)
==6485== by 0x4A3E19: io_callback (io.c:120)
==6485== by 0x4A27B5: l_main_iterate (main.c:478)
==6485== by 0x4A28F6: l_main_run (main.c:525)
==6485== by 0x4A2C0E: l_main_run_with_signal (main.c:647)
==6485== by 0x404D27: main (main.c:542)
==6485== Address 0x4a47290 is 32 bytes inside a block of size 104 free'd
==6485== at 0x48399CB: free (vg_replace_malloc.c:538)
==6485== by 0x49998B: l_free (util.c:136)
==6485== by 0x457699: netconfig_free (netconfig.c:130)
==6485== by 0x45A038: netconfig_destroy (netconfig.c:1163)
==6485== by 0x41FD16: station_free (station.c:3613)
==6485== by 0x42020E: station_destroy_interface (station.c:3710)
==6485== by 0x4B990E: interface_instance_free (dbus-service.c:510)
==6485== by 0x4BC193: _dbus_object_tree_remove_interface (dbus-service.c:1694)
==6485== by 0x4BA22A: _dbus_object_tree_object_destroy (dbus-service.c:795)
==6485== by 0x4B078D: l_dbus_unregister_object (dbus.c:1537)
==6485== by 0x417ACB: device_netdev_notify (device.c:361)
==6485== by 0x4062B6: netdev_free (netdev.c:808)
==6485== Block was alloc'd at
==6485== at 0x483879F: malloc (vg_replace_malloc.c:307)
==6485== by 0x499857: l_malloc (util.c:62)
==6485== by 0x459DC0: netconfig_new (netconfig.c:1115)
==6485== by 0x41FC29: station_create (station.c:3592)
==6485== by 0x4207B3: station_netdev_watch (station.c:3864)
==6485== by 0x411A17: netdev_initial_up_cb (netdev.c:5588)
==6485== by 0x4A5E7B: process_message (netlink.c:181)
==6485== by 0x4A626A: can_read_data (netlink.c:289)
==6485== by 0x4A3E19: io_callback (io.c:120)
==6485== by 0x4A27B5: l_main_iterate (main.c:478)
==6485== by 0x4A28F6: l_main_run (main.c:525)
==6485== by 0x4A2C0E: l_main_run_with_signal (main.c:647)
==6485==
netdev_free relies on netdev->connected being set to detect whether a
connection is in progress. This variable is only set once the driver
has been connected however, so for situations where a CMD_CONNECT is
still 'in flight' or if the wiphy work is still pending, the ongoing
connection will not be canceled. Fix that by being more thorough when
trying to detect that a connection is in progress.
src/wiphy.c:wiphy_radio_work_next() Starting work item 2
Terminate
src/netdev.c:netdev_free() Freeing netdev wlan0[9]
src/device.c:device_free()
src/station.c:station_free()
src/netconfig.c:netconfig_destroy()
Removing scan context for wdev c
src/scan.c:scan_context_free() sc: 0x4a44c80
src/netdev.c:netdev_mlme_notify() MLME notification New Station(19)
src/netdev.c:netdev_link_notify() event 16 on ifindex 9
==6356== Invalid write of size 4
==6356== at 0x40A253: netdev_cmd_connect_cb (netdev.c:2522)
==6356== by 0x4A8886: process_unicast (genl.c:986)
==6356== by 0x4A8C48: received_data (genl.c:1098)
==6356== by 0x4A3DFD: io_callback (io.c:120)
==6356== by 0x4A2799: l_main_iterate (main.c:478)
==6356== by 0x4A28DA: l_main_run (main.c:525)
==6356== by 0x4A2BF2: l_main_run_with_signal (main.c:647)
==6356== by 0x404D27: main (main.c:542)
==6356== Address 0x4a3e418 is 152 bytes inside a block of size 472 free'd
==6356== at 0x48399CB: free (vg_replace_malloc.c:538)
==6356== by 0x49996F: l_free (util.c:136)
==6356== by 0x406662: netdev_free (netdev.c:886)
==6356== by 0x4129C2: netdev_shutdown (netdev.c:5980)
==6356== by 0x403A14: iwd_shutdown (main.c:79)
==6356== by 0x403A7D: signal_handler (main.c:90)
==6356== by 0x4A2AFB: sigint_handler (main.c:612)
==6356== by 0x4A2F3B: handle_callback (signal.c:78)
==6356== by 0x4A3030: signalfd_read_cb (signal.c:104)
==6356== by 0x4A3DFD: io_callback (io.c:120)
==6356== by 0x4A2799: l_main_iterate (main.c:478)
==6356== by 0x4A28DA: l_main_run (main.c:525)
==6356== Block was alloc'd at
==6356== at 0x483879F: malloc (vg_replace_malloc.c:307)
==6356== by 0x49983B: l_malloc (util.c:62)
==6356== by 0x4121BD: netdev_create_from_genl (netdev.c:5776)
==6356== by 0x451F6F: manager_new_station_interface_cb (manager.c:173)
==6356== by 0x4A8886: process_unicast (genl.c:986)
==6356== by 0x4A8C48: received_data (genl.c:1098)
==6356== by 0x4A3DFD: io_callback (io.c:120)
==6356== by 0x4A2799: l_main_iterate (main.c:478)
==6356== by 0x4A28DA: l_main_run (main.c:525)
==6356== by 0x4A2BF2: l_main_run_with_signal (main.c:647)
==6356== by 0x404D27: main (main.c:542)
If the daemon is started and killed rapidly on startup, it is possible
for netdev_shutdown to be called prior to manager processing messages
that actually create the netdev itself. Since the netdev_list has
already been freed, the storage is lost. Fix that by destroying
netdev_list only when the module is unloaded.
If we're going down, make sure to notify any watches about EVENT_DEL
earlier. Not doing so might result in us not cleaning up requests that
might have been started as the result of this event.
station_free() is invoked when one of two possibilities happen:
- Device has been powered down, and EVENT_DOWN has been emitted
- Device has been removed, and EVENT_DEL has been emitted
In both cases there is not much point for netdev_disconnect to be
invoked as that tries to cleanly shut down an existing connection. The
only thing the ABORTED error accomplishes in this case is to send a
dbus_aborted_error for the pending_connect message, if it exists.
There's already code for doing this in station_free().
src/station.c:station_enter_state() Old State: autoconnect_quick, new state: connecting (auto)
src/scan.c:scan_cancel() Trying to cancel scan id 1 for wdev 7
src/wiphy.c:wiphy_radio_work_done() Work item 1 done
src/wiphy.c:wiphy_radio_work_next() Starting work item 2
Terminate
src/netdev.c:netdev_free() Freeing netdev wlan0[9]
src/device.c:device_free()
src/station.c:station_free()
src/wiphy.c:wiphy_radio_work_done() Work item 2 done
src/station.c:station_connect_cb() 9, result: 5
src/netconfig.c:netconfig_destroy()
Removing scan context for wdev 7
src/scan.c:scan_context_free() sc: 0x4a39490
src/netdev.c:netdev_mlme_notify() MLME notification New Station(19)
src/netdev.c:netdev_link_notify() event 16 on ifindex 9
src/netdev.c:netdev_link_notify() event 16 on ifindex 9
src/netdev.c:netdev_mlme_notify() MLME notification Authenticate(37)
src/netdev.c:netdev_link_notify() event 16 on ifindex 9
src/netdev.c:netdev_mlme_notify() MLME notification Associate(38)
src/netdev.c:netdev_link_notify() event 16 on ifindex 9
src/netdev.c:netdev_mlme_notify() MLME notification Connect(46)
src/netdev.c:netdev_link_notify() event 16 on ifindex 9
src/wiphy.c:wiphy_reg_notify() Notification of command Reg Change(36)
src/wiphy.c:wiphy_update_reg_domain() New reg domain country code for (global) is US
src/netdev.c:netdev_link_notify() event 16 on ifindex 9
src/netdev.c:netdev_unicast_notify() Unicast notification 129
src/netdev.c:netdev_mlme_notify() MLME notification Del Station(20)
src/netdev.c:netdev_mlme_notify() MLME notification Deauthenticate(39)
src/netdev.c:netdev_mlme_notify() MLME notification Disconnect(48)
src/wiphy.c:wiphy_reg_notify() Notification of command Reg Change(36)
src/wiphy.c:wiphy_update_reg_domain() New reg domain country code for (global) is XX
==20311== Invalid write of size 4
==20311== at 0x406E74: netdev_cmd_disconnect_cb (netdev.c:1130)
==20311== by 0x4A78A8: process_unicast (genl.c:986)
==20311== by 0x4A7C6A: received_data (genl.c:1098)
==20311== by 0x4A2E1F: io_callback (io.c:120)
==20311== by 0x4A17BB: l_main_iterate (main.c:478)
==20311== by 0x4A18FC: l_main_run (main.c:525)
==20311== by 0x4A1C14: l_main_run_with_signal (main.c:647)
==20311== by 0x404D27: main (main.c:542)
==20311== Address 0x4a37a0c is 156 bytes inside a block of size 472 free'd
==20311== at 0x48399CB: free (vg_replace_malloc.c:538)
==20311== by 0x498991: l_free (util.c:136)
==20311== by 0x406651: netdev_free (netdev.c:883)
==20311== by 0x412976: netdev_shutdown (netdev.c:5970)
==20311== by 0x403A14: iwd_shutdown (main.c:79)
==20311== by 0x403A7D: signal_handler (main.c:90)
==20311== by 0x4A1B1D: sigint_handler (main.c:612)
==20311== by 0x4A1F5D: handle_callback (signal.c:78)
==20311== by 0x4A2052: signalfd_read_cb (signal.c:104)
==20311== by 0x4A2E1F: io_callback (io.c:120)
==20311== by 0x4A17BB: l_main_iterate (main.c:478)
==20311== by 0x4A18FC: l_main_run (main.c:525)
The data rate estimation belongs in wiphy since it should take hardware
capabilities into account. Right now the data rate calculation simply
assumes the hardware is as capable as the AP. scan.c will be ported to
use this utility and the data rate estimation will be expanded to take
wiphy capabilities into account.
scan_parse_result used to parse the wdev and return this to the caller
where it was compared against the expected wdev. Simplify this by
extract the wdev first, and proceeding with the bss parsing afterwards.
Right now a very limited set of band parameters are parsed into wiphy.
This includes the supported rates and the supported frequencies.
However, there is much more information that is given for each band.
Introduce a new band object that will store this information and can be
extended for future use.
Change the char *addr_str and uint8_t prefix_len pair to an
l_rtnl_address object and use ell/rtnl.h utilities that use that
directly. Extend broadcast_from_ip to handle prefix_len.
We generate the DBus error reply type from the errno only when
ap_start() was failing synchronously, now also send the errno through
the callbacks so that we can also return a specific DBus reply when
failing asynchronously. Thea AP autotest relies on receiving the
AlreadyExists DBus error.
Deprecate the global [General].APRanges setting in favour of
[IPv4].APAddressPool with an extended (but backwards-compatible) syntax.
Drop the existing address pool creation code.
The new APAddressPool setting has the same syntax as the profile-local
[IPv4].Address setting and the subnet selection code will fall back
to the global setting if it's missing, this way we use common code to
handle both settings.
Extend the [IPv4].Address setting's syntax to allow a new format: a list
of <IP>/<prefix_len> -form strings that define the address space from
which a subnet is selected. Rewrite the DHCP settings loading with
other notable changes:
* validate some of the settings more thoroughly,
* name all netconfig-related ap_state members with the netconfig_
prefix,
* make sure we always call l_dhcp_server_set_netmask(),
* allow netmasks other than 24-bit and change the default to 28 bits,
* as requested avoid using the l_net_ ioctl-based functions although
l_dhcp still uses them internally,
* as requested avoid touching the ap_state members until the end of
some functions so that on error they're basically a no-op (for
readability).
Add the ip_pool_select_addr4 function to select a random subnet of requested
size from an address space defined by a string list (for use with the
AP profile [IPv4].Address and the global [IPv4].APAddressPool settings),
avoiding those subnets that conflict with subnets in use. We take care
to give a similar weight to all subnets contained in the specified
ranges regardless of how many ranges contain each, basically so that
overlapping ranges don't affect the probabilities (debatable.)
Add the ip-pool submodule that tracks IPv4 addresses in use on the
system for use when selecting the address for a new AP. l_rtnl_address
is used internally because if we're going to return l_rtnl_address
objects it would be misleading if we didn't fill in all of their
properties like flags etc.
If the connected BSS changes channel, netdev will emit an event with the
new channel's frequency. In response, have station change the frequency
of the connected scan_bss struct and inform network about the update.
If the connected BSS announces that it is switching operating channel,
the kernel may emit the NL80211_CMD_CH_SWTICH_NOTIFY event when the
switch is complete. Add a new netdev event NETDEV_EVENT_CHANNEL_SWITCHED
to signal to interested modules that the connected BSS has changed
channel. The event carries a pointer to the new channel's frequency.
NL80211_BSS_LAST_SEEN_BOOTTIME is expressed in nanoseconds, while BSS
timestamps are expressed in microseconds internally. Convert the
attribute to microseconds when using it to timestamp a BSS. This makes
iwd expire absent BSSes within 30 seconds as intended.
Fixes: 454cee12d4 ("scan: Use kernel-reported time-stamp if provided")
Right now, if a connection to a network selected by auto-connect fails,
the entire autoconnect process is restarted. This means that scans are
kicked off again, auto-connect list is rebuilt, etc. This was due to
auto-connect reusing the same failure path as connections triggered via
D-Bus.
The above behavior can lead to weird situations in certain corner cases.
For example, a highly preferred network configured with the wrong
password would result in auto-connect entering an infinite loop.
Fix this by making sure that all auto-connect entries are tried and
exhausted prior to re-scanning again.
The temporary ban list is cleared when a network is connected to
successfully, and also in network_connect_failed. Unfortunately,
network_connect_failed is not called in all paths (i.e. during
autoconnect) since it messes with the state of secrets and passphrases.
Clear the list in network_disconnected() instead, since it is guaranteed
to be called in every circumstance.
This will be effectively the same as the CONNECTING state, but can be
used to enable differing behavior, depending on whether connection was
triggered by autoconnect or via D-Bus.
Code that walked the VHT TX/RX MCS maps seemed to assume that bit_field
operated on bits that start at '1'. But this utility actually operates
on bits that start at '0'. I.e. the least significant bit is at
position 0.
While we're at it, rename the mcs variable into bitoffset to make it
clearer how the maps are being iterated over. Supported MCS is actually
the value found in the map.
This option has not been used in a very long time, and is of limited
utility since the only thing D-Bus debugging does is hexdumps the
content of D-Bus messages to the terminal.
The current calculation was giving erroneous results when it came to VHT
MCS index 4 and VHT MCS index 8 & 9.
Switch to a precomputed look up table and add a multiplication factor
for short GI.
ap_reset() seems to be called whenever the AP is stopped or removed due
to interface shutdown. For some reason ap_reset did not remove the DHCP
server object, resulting in leaks:
==211== at 0x483879F: malloc (vg_replace_malloc.c:307)
==211== by 0x46B5AD: l_malloc (util.c:62)
==211== by 0x49B0E2: l_dhcp_server_new (dhcp-server.c:715)
==211== by 0x433AA3: ap_setup_dhcp (ap.c:2615)
==211== by 0x433AA3: ap_load_dhcp (ap.c:2645)
==211== by 0x433AA3: ap_load_config (ap.c:2753)
==211== by 0x433AA3: ap_start (ap.c:2885)
==211== by 0x434A96: ap_dbus_start_profile (ap.c:3329)
==211== by 0x482DA9: _dbus_object_tree_dispatch (dbus-service.c:1815)
==211== by 0x47A4D9: message_read_handler (dbus.c:285)
==211== by 0x4720EB: io_callback (io.c:120)
==211== by 0x47130C: l_main_iterate (main.c:478)
==211== by 0x4713DB: l_main_run (main.c:525)
==211== by 0x4713DB: l_main_run (main.c:507)
==211== by 0x4715EB: l_main_run_with_signal (main.c:647)
==211== by 0x403EE1: main (main.c:550)
==209== by 0x43E48A: netconfig_ipv4_select_and_install (netconfig.c:887)
==209== by 0x43E48A: netconfig_configure (netconfig.c:1025)
==209== by 0x41743C: station_connect_cb (station.c:2556)
==209== by 0x408E0D: netdev_connect_ok (netdev.c:1311)
==209== by 0x47549E: process_unicast (genl.c:994)
==209== by 0x47549E: received_data (genl.c:1102)
==209== by 0x4720EB: io_callback (io.c:120)
==209== by 0x47130C: l_main_iterate (main.c:478)
==209== by 0x4713DB: l_main_run (main.c:525)
==209== by 0x4713DB: l_main_run (main.c:507)
==209== by 0x4715EB: l_main_run_with_signal (main.c:647)
==209== by 0x403EE1: main (main.c:550)
Prior to the BSS blacklist a BSS based autoconnect list made
the most sense, but now station actually retries all BSS's upon
failure. This means that for each BSS in the autoconnect list
every other BSS under that SSID will be attempted to connect to
if there is a failure. Essentially this is a network based
autoconnect list, just an indirect way of doing it.
Intead the autoconnect list can be purely network based, using
the network rank for sorting. This avoids the need for a special
autoconnect_entry struct as well as ensures the last connected
network is chosen first (simply based on existing network ranking
logic).
It was observed that IWD's ranking for BSS's did not always
end up with the fastest being chosen. This was due to IWD's
heavy weight on signal strength. This is a decent way of ranking
but even better is calculating a theoretical data rate which
was also done and factored in. The problem is the data rate
factor was always outdone by the signal strength.
Intead remove signal strength entirely as this is already taken
into account with the data rate calculation. This also removes
the check for rate IEs. If no IEs are found the parser will
base the data rate soley on RSSI.
There were a few other factors removed which will be added back
when ranking *networks* rather than BSS's. WPA version (or open)
was removed as well as the privacy capability. These values really
should not differ between BSS's in the same SSID and as such
should be used for network ranking instead.
Both ext/supported rates IEs are obtained from scan results. These
IEs are passed to ie_tlv_init/ie_tlv_next, as well as direct length
checks (for supported rates at least, extended supported rates can
be as long as a single byte integer can hold, 1 - 255) which verifies
that the length in the IE matches the overall IE length that is
stored in scan_bss. Because of this, ie_parse_supported_rates_from_data
was doing double duty re-initializing a TLV iterator.
Intead, since we know the IE length is within bounds, the length/data
can simply be directly accessed out of the buffer. This avoids the need
for a wrapper function entirely.
The length parameters were also removed, since this is now obtained
directly from the IE.
Since netdev maintains the list of FT over DS info structs there is not
any need for station to get callbacks when the initial action frame
is received, or not. This removes the need for the callback handler,
user data, and response timeout.
Roam times can be slightly improved by sending out the FT-over-DS
action frames to any BSS in the mobility domain immediately after
connecting. This preauthenticates IWD to each AP which means
Reassociation can happen right away when a roam is needed.
When a roam is needed station_transition_start will first try
FT-over-DS (if supported) via netdev_fast_transtion_over_ds. The
return is checked and if netdev has no cached entries FT-over-Air
will be used instead.
The beauty of FT-over-DS is that a station can send and receive
action frames to many APs to prepare for a future roam. Each
AP authenticates the station and when a roam happens the station
can immediately move to reassociation.
To handle this a queue of netdev_ft_over_ds_info structs is used
instead of a single entry. Using the new ft.c parser APIs these
info structs can be looked up when responses come in. For now
the timeouts/callbacks are kept but these will be removed as it
really does not matter if the AP sends a response (keeps station
happy until the next patch).
This is to prepare for multiple concurrent FT-over-DS action frames.
A list will be kept in netdev and for lookup reasons it needs to
parse the start of the frame to grab the aa/spa addresses. In this
call the IEs are also returned and passed to the new
ft_over_ds_parse_action_response.
For now the address checks have been moved into netdev, but this will
eventually turn into a queue lookup.
This value sets the roaming threshold on 5GHz networks. The
threshold has been separated from 2.4GHz because in many cases
5GHz can perform much better at low RSSI than 2.4GHz.
In addition the BSS ranking logic was re-worked and now 5GHz is
much more preferred, even at low RSSI. This means we need a
lower floor for RSSI before roaming, otherwise IWD would end
up roaming immediately after connecting due to low RSSI CQM
events.
This is being added as a developer method and should not be used
in production. For testing purposes though, it is quite useful as
it forces IWD to roam to a provided BSS and bypasses IWD's roaming
and ranking logic for choosing a roam candidate.
To use this a BSSID is provided as the only parameter. If this
BSS is not in IWD's current scan results -EINVAL will be returned.
If IWD knows about the BSS it will attempt to roam to it whether
that is via FT, FT-over-DS, or Reassociation. These details are
still sorted out in IWDs station_transition_start() logic.
This will enable developer features to be used. Currently the
only user of this will be StationDiagnostics.Roam() method which
should only be exposed in this mode.
Expose the state directory/storage directory path on D-Bus because it
can't be known to clients until IWD runs, and client might need to
occasionally fiddle with the network config files. While there also
expose the IWD version string, similar to how some other D-Bus services
do.
Similar to 06aa84cca set the operstate when AdHoc is started and
stopped as it is no longer always set by netdev (only for station/p2p
interface types)
Previously resp was a simple array of bytes allocated on the stack.
This was changed to a dynamically allocated array, but the sizeof(resp)
argument to ap_build_beacon_pr_head() was never changed appropriately.
Fix this by introducing a new resp_len variable that holds the number of
bytes allocated for resp. Also, move the allocation after the basic
sanity checks have been performed to avoid allocating/freeing memory
unnecessarily.
Fixes: 18a63f91fd ("ap: Write extra frame IEs from the user")
Commit 1fe5070 added a workaround for drivers which may send the
connect event prior to the connect callback/ack. This caused IWD
to fail to start eapol if reassociation was used due to
netdev_reassociate never setting netdev->connected = false.
netdev_reassociate uses the same code path as normal connections,
but when the connect callback came in connected was already set
to true which then prevents eapol from being registered. Then,
once the connect event comes in, there is no frame watch for
eapol and IWD doesn't respond to any handshake frames.
Prior to this, an error sending the FT Reassociation was treated
as fatal, which is correct for FT-over-Air but not for FT-over-DS.
If the actual l_genl_family_send call fails for FT-over-DS the
existing connection can be maintained and there is no need to
call netdev_connect_failed.
Adding a return to the tx_associate function works for both FT
types. In the FT-over-Air case this return will ultimately get
sent back up to auth_proto_rx_authenticate in which case will
call netdev_connect_failed. For FT-over-DS tx_associate is
actually called from the 'start' operation which can fail and
still maintain the existing connection.
FT-over-DS was refactored to separate the FT action frame and
reassociation. From stations standpoint IWD needs to call
netdev_fast_transition_over_ds_action prior to actually roaming.
For now these two stages are being combined and the action
roam happens immediately after the action response callback.
FT-over-DS followed the same pattern as FT-over-Air which worked,
but really limited how the protocol could be used. FT-over-DS is
unique in that we can authenticate to many APs by sending out
FT action frames and parsing the results. Once parsed IWD can
immediately Reassociate, or do so at a later time.
To take advantage of this IWD need to separate FT-over-DS into
two stages: action frame and reassociation.
The initial action frame stage is started by netdev. The target
BSS is sent an FT action frame and a new cache entry is created
in ft.c. Once the response is received the entry is updated
with all the needed data to Reassociate. To limit the record
keeping on netdev each FT-over-DS entry holds a userdata pointer
so netdev doesn't need to maintain its own list of data for
callbacks.
Once the action response is parsed netdev will call back signalling
the action frame sequence was completed (either successfully or not).
At this point the 'normal' FT procedure can start using the
FT-over-DS auth-proto.
FT-over-DS is being separated into two independent stages. The
first of which is the processing of the action frame response.
This new class will hold all the parsed information from the action
frame and allowing it to be retrieved at a later time when IWD
needs to roam.
Initial info class should be created when the action frame is
being sent out. Once a response is received it can be parsed
with ft_over_ds_parse_action_response. This verifies the frame
and updates the ft_ds_info class with the parsed data.
ft_over_ds_prepare_handshake is the final step prior to
Reassociation. This sets all the stored IEs, anonce, and KH IDs
into the handshake and derives the new PTK.
This adds the RSNE verification to ft_parse_ies which will
be common between over-Air and over-DS. The MDE check was
also factored out into its own minimal function as to
retain the spec comment but allow reuse elsewhere.
Prior to this the diagnostic interface was taken down when station
transitioned to DISCONNECTED. This worked but once station is in
a DISCONNECTING state it then calls netdev_disconnect(). Trying to
get any diagnostic data during this time may not work as its
unknown what state exactly the kernel is in. To be safe take the
interface down when station is DISCONNECTING.
The building of the FT IEs for Action/Authenticate
frames will need to be shared between ft and netdev
once FT-over-DS is refactored.
The building was refactored to work off the callers
buffer rather than internal stack buffers. An argument
'new_snonce' was included as FT-over-DS will generate
a new snonce for the initial action frame, hence the
handshakes snonce cannot be used.
Break up the rather large code block which parses out IEs,
verifies, and sets into the handshake. FT-over-DS needs these
steps broken up in order to parse the action frame response
without modifying the handshake.
Under very rare circumstances the roaming scan triggered might not be
canceled properly. This is because we issue the roam scan recursively
from within a scan callback and re-use the id of the scan for the
subsequent request. The destroy callback is invoked right after the
callback and resets the id. This leads to the scan not being canceled
properly in roam_state_clear().
src/netdev.c:netdev_mlme_notify() MLME notification Notify CQM(64)
src/station.c:station_roam_trigger_cb() 37
src/station.c:station_roam_scan() ifindex: 37
src/station.c:station_roam_trigger_cb() Using cached neighbor report for roam
...
src/scan.c:get_scan_done() get_scan_done
src/station.c:station_roam_failed() 37
src/station.c:station_roam_scan() ifindex: 37
src/scan.c:scan_request_triggered() Active scan triggered for wdev 22
^CTerminate
src/netdev.c:netdev_free() Freeing netdev wlan0[37]
src/device.c:device_free()
src/station.c:station_free()
...
Removing scan context for wdev 22
src/scan.c:scan_context_free() sc: 0x4a362a0
src/wiphy.c:wiphy_radio_work_done() Work item 14 done
==19542== Invalid write of size 4
==19542== at 0x411500: station_roam_scan_destroy (station.c:2010)
==19542== by 0x420B5B: scan_request_free (scan.c:156)
==19542== by 0x410BAC: destroy_work (wiphy.c:294)
==19542== by 0x410BAC: wiphy_radio_work_done (wiphy.c:1613)
==19542== by 0x46C66E: l_queue_clear (queue.c:107)
==19542== by 0x46C6B8: l_queue_destroy (queue.c:82)
==19542== by 0x420BAE: scan_context_free (scan.c:205)
==19542== by 0x424135: scan_wdev_remove (scan.c:2272)
==19542== by 0x408754: netdev_free (netdev.c:847)
==19542== by 0x40E18C: netdev_shutdown (netdev.c:5773)
==19542== by 0x404756: iwd_shutdown (main.c:78)
==19542== by 0x404756: iwd_shutdown (main.c:65)
==19542== by 0x470E21: handle_callback (signal.c:78)
==19542== by 0x470E21: signalfd_read_cb (signal.c:104)
==19542== by 0x47166B: io_callback (io.c:120)
==19542== Address 0x4d81f98 is 200 bytes inside a block of size 288 free'd
==19542== at 0x48399CB: free (vg_replace_malloc.c:538)
==19542== by 0x47F3E5: interface_instance_free (dbus-service.c:510)
==19542== by 0x481DEA: _dbus_object_tree_remove_interface (dbus-service.c:1694)
==19542== by 0x481F1C: _dbus_object_tree_object_destroy (dbus-service.c:795)
==19542== by 0x40894F: netdev_free (netdev.c:844)
==19542== by 0x40E18C: netdev_shutdown (netdev.c:5773)
==19542== by 0x404756: iwd_shutdown (main.c:78)
==19542== by 0x404756: iwd_shutdown (main.c:65)
==19542== by 0x470E21: handle_callback (signal.c:78)
==19542== by 0x470E21: signalfd_read_cb (signal.c:104)
==19542== by 0x47166B: io_callback (io.c:120)
==19542== by 0x47088C: l_main_iterate (main.c:478)
==19542== by 0x47095B: l_main_run (main.c:525)
==19542== by 0x47095B: l_main_run (main.c:507)
==19542== by 0x470B6B: l_main_run_with_signal (main.c:647)
==19542== Block was alloc'd at
==19542== at 0x483879F: malloc (vg_replace_malloc.c:307)
==19542== by 0x46AB2D: l_malloc (util.c:62)
==19542== by 0x416599: station_create (station.c:3448)
==19542== by 0x406D55: netdev_newlink_notify (netdev.c:5324)
==19542== by 0x46D4BC: l_hashmap_foreach (hashmap.c:612)
==19542== by 0x472F46: process_broadcast (netlink.c:158)
==19542== by 0x472F46: can_read_data (netlink.c:279)
==19542== by 0x47166B: io_callback (io.c:120)
==19542== by 0x47088C: l_main_iterate (main.c:478)
==19542== by 0x47095B: l_main_run (main.c:525)
==19542== by 0x47095B: l_main_run (main.c:507)
==19542== by 0x470B6B: l_main_run_with_signal (main.c:647)
==19542== by 0x403EDB: main (main.c:490)
==19542==
Prior to this netdev_connect_ok set setting this which really
only applies to station mode. In addition this happens for each
new station that connects to the AP. Instead set the operstate /
link mode when AP starts and stops.
Change ap_start to load all of the AP configuration from a struct
l_settings, moving the 6 or so parameters from struct ap_config members
to the l_settings groups and keys. This extends the ap profile concept
used for the DHCP settings. ap_start callers create the l_settings
object and fill the values in it or read the settings in from a file.
Since ap_setup_dhcp and ap_load_profile_and_dhcp no longer do the
settings file loading, they needed to be refactored and some issues were
fixed in their logic, e.g. l_dhcp_server_set_ip_address() was never
called when the "IP pool" was used. Also the IP pool was previously only
used if the ap->config->profile was NULL and this didn't match what the
docs said:
"If [IPv4].Address is not provided and no IP address is set on the
interface prior to calling StartProfile the IP pool will be used."
The info struct is on the stack which leads to the potential
for uninitialized data access. Zero out the info struct prior
to calling the get station callback:
==141137== Conditional jump or move depends on uninitialised value(s)
==141137== at 0x458A6F: diagnostic_info_to_dict (diagnostic.c:109)
==141137== by 0x41200B: station_get_diagnostic_cb (station.c:3620)
==141137== by 0x405BE1: netdev_get_station_cb (netdev.c:4783)
==141137== by 0x4722F9: process_unicast (genl.c:994)
==141137== by 0x4722F9: received_data (genl.c:1102)
==141137== by 0x46F28B: io_callback (io.c:120)
==141137== by 0x46E5AC: l_main_iterate (main.c:478)
==141137== by 0x46E65B: l_main_run (main.c:525)
==141137== by 0x46E65B: l_main_run (main.c:507)
==141137== by 0x46E86B: l_main_run_with_signal (main.c:647)
==141137== by 0x403EA8: main (main.c:490)
It isn't safe to return a NULL from diagnostic_akm_suite_to_security()
since the value is used directly. Also, if the AKM suite is 0, this
implies that the network is an Open network and not some unknown AKM.
==17982== Invalid read of size 1
==17982== at 0x483BC92: strlen (vg_replace_strmem.c:459)
==17982== by 0x47DE60: _dbus1_builder_append_basic (dbus-util.c:981)
==17982== by 0x41ACB2: dbus_append_dict_basic (dbus.c:197)
==17982== by 0x412050: station_get_diagnostic_cb (station.c:3614)
==17982== by 0x405B19: netdev_get_station_cb (netdev.c:4801)
==17982== by 0x47436E: process_unicast (genl.c:994)
==17982== by 0x47436E: received_data (genl.c:1102)
==17982== by 0x470FBB: io_callback (io.c:120)
==17982== by 0x4701DC: l_main_iterate (main.c:478)
==17982== by 0x4702AB: l_main_run (main.c:525)
==17982== by 0x4702AB: l_main_run (main.c:507)
==17982== by 0x4704BB: l_main_run_with_signal (main.c:647)
==17982== by 0x403EDB: main (main.c:490)
==17982== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==17982==
Aborting (signal 11) [/home/denkenz/iwd/src/iwd]
++++++++ backtrace ++++++++
0 0x488a550 in /lib64/libc.so.6
1 0x483bc92 in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so
2 0x47de61 in _dbus1_builder_append_basic() at ell/dbus-util.c:983
3 0x41acb3 in dbus_append_dict_basic() at src/dbus.c:197
4 0x412051 in station_get_diagnostic_cb() at src/station.c:3618
5 0x405b1a in netdev_get_station_cb() at src/netdev.c:4801
It is possible for the RTNL command callback to come after
netconfig_reset or netconfig_destroy has been called. Make sure that
any outstanding commands that might access the netconfig object are
canceled.
src/netconfig.c:netconfig_ipv4_dhcp_event_handler() DHCPv4 event 0
src/netconfig.c:netconfig_ifaddr_added() wlan0: ifaddr 192.168.1.55/24 broadcast 192.168.1.255
^CTerminate
src/netdev.c:netdev_free() Freeing netdev wlan0[15]
src/device.c:device_free()
src/station.c:station_free()
src/netconfig.c:netconfig_destroy()
src/netconfig.c:netconfig_reset()
src/netconfig.c:netconfig_reset_v4() 16
src/netconfig.c:netconfig_reset_v4() Stopping client
Removing scan context for wdev c
src/scan.c:scan_context_free() sc: 0x4a3cc10
==12792== Invalid read of size 8
==12792== at 0x43BF5A: netconfig_route_add_cmd_cb (netconfig.c:600)
==12792== by 0x4727FA: process_message (netlink.c:181)
==12792== by 0x4727FA: can_read_data (netlink.c:289)
==12792== by 0x470F4B: io_callback (io.c:120)
==12792== by 0x47016C: l_main_iterate (main.c:478)
==12792== by 0x47023B: l_main_run (main.c:525)
==12792== by 0x47023B: l_main_run (main.c:507)
==12792== by 0x47044B: l_main_run_with_signal (main.c:647)
==12792== by 0x403EDB: main (main.c:490)
In case the netdev is brought down while we're trying to connect, try to
detect this and fail early instead of trying to send additional
commands.
src/station.c:station_enter_state() Old State: disconnected, new state: connecting
src/station.c:station_netdev_event() Associating
src/netdev.c:netdev_mlme_notify() MLME notification Connect(46)
src/netdev.c:netdev_connect_event()
src/netdev.c:netdev_link_notify() event 16 on ifindex 4
src/eapol.c:eapol_handle_ptk_1_of_4() ifindex=4
src/netdev.c:netdev_link_notify() event 16 on ifindex 4
src/eapol.c:eapol_handle_ptk_3_of_4() ifindex=4
src/netdev.c:netdev_set_gtk() 4
src/station.c:station_handshake_event() Setting keys
src/netdev.c:netdev_set_tk() 4
src/netdev.c:netdev_set_rekey_offload() 4
New Key for Group Key failed for ifindex: 4:Network is down
src/netdev.c:netdev_link_notify() event 16 on ifindex 4
src/station.c:station_free()
src/netdev.c:netdev_mlme_notify() MLME notification Disconnect(48)
src/netdev.c:netdev_disconnect_event()
src/wiphy.c:wiphy_reg_notify() Notification of command Reg Change(36)
src/wiphy.c:wiphy_update_reg_domain() New reg domain country code for (global) is XX
src/netdev.c:netdev_link_notify() event 16 on ifindex 4
src/wiphy.c:wiphy_reg_notify() Notification of command Reg Change(36)
src/wiphy.c:wiphy_update_reg_domain() New reg domain country code for (global) is DE
src/wiphy.c:wiphy_radio_work_done() Work item 14 done
src/station.c:station_connect_cb() 4, result: 4
Segmentation fault
A prior commit refactored the AKM selection in wiphy.c. This
ended up breaking FILS tests due to the hard coding of a
false fils_hint in wiphy_select_akm. Since our FILS tests
only advertise FILS AKMs wiphy_can_connect would return false
for these networks.
Similar to wiphy_select_akm, add a fils hint parameter to
wiphy_can_connect and pass that down directly to wiphy_select_akm.
If PreSharedKey is set, the current logic does not validate the
Passphrase beyond its existence. This can lead to strange situations
where an invalid WPA3-PSK passphrase might get used. This can of course
only happen if the user (as root) or NetworkManager-iwd-backend writes
such a file incorrectly.
Move the WSC Primary Device Type parsing from p2p.c and eap-wsc.c to a
common function in wscutil.c supporting both formats so that it can be
used in ap.c too.
Logically this frame watch belongs in station. It was kept in device.c
for the purported reason that the station object was removed with
ifdown/ifup changes and hence the frame watch might need to be removed
and re-added unnecessarily. Since the kernel does not actually allow to
unregister a frame watch (only when the netdev is removed or its iftype
changes), re-adding a frame watch might trigger a -EALREADY or similar
error.
Avoid this by registering the frame watch when a new netdev is detected
in STATION mode, or when the interface type changes to STATION.
If a netdev iftype is changed, all frame registrations are removed.
Make sure to re-register for the appropriate frame notifications in case
our iftype is switched back to 'station'. In any other iftype, no frame
watches are registered and rrm_state object is effectively dormant.
Right now, RRM is created when a new netdev is detected and its iftype
is of type station. That means that any devices that start their life
as any other iftype cannot be changed to a station and have RRM function
properly. Fix that by always creating the RRM state regardless of the
initial iftype.
In the case that a netdev is powered down, or an interface type change
occurs, the station object will be removed and any watches will be
freed.
Since rrm is created when the netdev is created and persists across
iftype and power up/down changes, it should provide a destroy callback
to station_add_state_watch so that it can be notified when the watch is
removed.
If the iftype changes, kernel silently wipes out any frame registrations
we may have registered. Right now, frame registrations are only done when
the interface is created. This can result in frame watches not being
added if the interface type is changed between station mode to ap mode
and then back to station mode, e.g.:
device wlan0 set-property Mode ap
device wlan0 set-property Mode station
Make sure to re-add frame registrations according to the mode if the
interface type is changed.
Since netdev now keeps track of iftype changes, let it call
frame_watch_wdev_remove on netdevs that it manages to clear frame
registrations that should be cleared due to an iftype change.
Note that P2P_DEVICE wdevs are not managed by any netdev object, but
since their iftype cannot be changed, they should not be affected
by this change.
And set the interface type based on the event rather than the command
callback. This allows us to track interface type changes even if they
come from outside iwd (which shouldn't happen.)
The prepare_ft patch was an intermediate to a full patch
set and was not fully tested stand alone. Its placement
actually broke FT due to handshake->aa getting overwritten
prior to netdev->prev_bssid being copied out. This caused
FT to fail with "transport endpoint not connected (-107)"
- Make sure to print the cookie information
- Don't print messages for frames we're not interested in. This is
particularly helpful when running auto-tests since frame acks from
hostapd pollute the iwd log.
Fix a regression where connection to an open network results in an
NotSupported error being returned.
Fixes: d79e883e93 ("netdev: Introduce connection types")
This makes conversions simpler. Also fixes a bug where P2P devices were
printed with an incorrect Mode value since dbus_iftype_to_string was
assuming that an iftype as defined in nl80211.h was being passed in,
while netdev was returning an enum value defined in netdev.h.
It was seen that some full mac cards/drivers do not include any
rate information with the NEW_STATION event. This was causing
the NEW_STATION event to be ignored, preventing AP mode from
working on these cards.
Since the full mac path does not even require sta->rates the
parsing can be removed completely.
It was found that if the user cancels/disconnects the agent prior to
entering credentials, IWD would get stuck and could no longer accept
any connect calls with the error "Operation already in progress".
For example exiting iwctl in the Password prompt would cause this:
iwctl
$ station wlan0 connect myssid
$ Password: <Ctrl-C>
This was due to the agent never calling the network callback in the
case of an agent disconnect. Network would wait indefinitely for the
credentials, and disallow any future connect attempts.
To fix this agent_finalize_pending can be called in agent_disconnect
with a NULL reply which behaves the same as if there was an
internal timeout and ultimately allows network to fail the connection
The 8021x offloading procedure still does EAP in userspace which
negotiates the PMK. The kernel then expects to obtain this PMK
from userspace by calling SET_PMK. This then allows the firmware
to begin the 4-way handshake.
Using __eapol_install_set_pmk_func to install netdev_set_pmk,
netdev now gets called into once EAP finishes and can begin
the final userspace actions prior to the firmware starting
the 4-way handshake:
- SET_PMK using PMK negotiated with EAP
- Emit SETTING_KEYS event
- netdev_connect_ok
One thing to note is that the kernel provides no way of knowing if
the 4-way handshake completed. Assuming SET_PMK/SET_STATION come
back with no errors, IWD assumes the PMK was valid. If not, or
due to some other issue in the 4-way, the kernel will send a
disconnect.
This adds a new type for 8021x offload as well as support in
building CMD_CONNECT.
As described in the comment, 8021x offloading is not particularly
similar to PSK as far as the code flow in IWD is concerned. There
still needs to be an eapol_sm due to EAP being done in userspace.
This throws somewhat of a wrench into our 'is_offload' cases. And
as such this connection type is handled specially.
802.1x offloading needs a way to call SET_PMK after EAP finishes.
In the same manner as set_tk/gtk/igtk a new 'install_pmk' function
was added which eapol can call into after EAP completes.
The chances were extremely low, but using l_idle_oneshot
could end up causing a invalid memory access if the netdev
went down while waiting for the disconnect idle callback.
Instead netdev can keep track of the idle with l_idle_create
and remove it if the netdev goes down prior to the idle callback.
This fixes an infinite loop issue when authenticate frames time
out. If the AP is not responding IWD ends up retrying indefinitely
due to how SAE was handling this timeout. Inside sae_auth_timeout
it was actually sending another authenticate frame to reject
the SAE handshake. This, again, resulted in a timeout which called
the SAE timeout handler and repeated indefinitely.
The kernel resend behavior was not taken into account when writing
the SAE timeout behavior and in practice there is actually no need
for SAE to do much of anything in response to a timeout. The
kernel automatically resends Authenticate frames 3 times which mirrors
IWDs SAE behavior anyways. Because of this the authenticate timeout
handler can be completely removed, which will cause the connection
to fail in the case of an autentication timeout.
This crash was caused from the disconnect_cb being called
immediately in cases where send_disconnect was false. The
previous patch actually addressed this separately as this
flag was being set improperly which will, indirectly, fix
one of the two code paths that could cause this crash.
Still, there is a situation where send_disconnect could
be false and in this case IWD would still crash. If IWD
is waiting to queue the connect item and netdev_disconnect
is called it would result in the callback being called
immediately. Instead we can add an l_idle as to allow the
callback to happen out of scope, which is what station
expects.
Prior to this patch, the crashing behavior can be tested using
the following script (or some variant of it, your system timing
may not be the same as mine).
iwctl station wlan0 disconnect
iwctl station wlan0 connect <network1> &
sleep 0.02
iwctl station wlan0 connect <network2>
++++++++ backtrace ++++++++
0 0x7f4e1504e530 in /lib64/libc.so.6
1 0x432b54 in network_get_security() at src/network.c:253
2 0x416e92 in station_handshake_setup() at src/station.c:937
3 0x41a505 in __station_connect_network() at src/station.c:2551
4 0x41a683 in station_disconnect_onconnect_cb() at src/station.c:2581
5 0x40b4ae in netdev_disconnect() at src/netdev.c:3142
6 0x41a719 in station_disconnect_onconnect() at src/station.c:2603
7 0x41a89d in station_connect_network() at src/station.c:2652
8 0x433f1d in network_connect_psk() at src/network.c:886
9 0x43483a in network_connect() at src/network.c:1183
10 0x4add11 in _dbus_object_tree_dispatch() at ell/dbus-service.c:1802
11 0x49ff54 in message_read_handler() at ell/dbus.c:285
12 0x496d2f in io_callback() at ell/io.c:120
13 0x495894 in l_main_iterate() at ell/main.c:478
14 0x49599b in l_main_run() at ell/main.c:521
15 0x495cb3 in l_main_run_with_signal() at ell/main.c:647
16 0x404add in main() at src/main.c:490
17 0x7f4e15038b25 in /lib64/libc.so.6
The send_disconnect flag was being improperly set based only
on connect_cmd_id being zero. This does not take into account
the case of CMD_CONNECT having finished but not EAPoL. In this
case we do need to send a disconnect.
This adds a new connection type, TYPE_PSK_OFFLOAD, which
allows the 4-way handshake to be offloaded by the firmware.
Offloading will be used if the driver advertises support.
The CMD_ROAM event path was also modified to take into account
handshake offloading. If the handshake is offloaded we still
must issue GET_SCAN, but not start eapol since the firmware
takes care of this.
Until now FT was only supported via Auth/Assoc commands which barred
any fullmac cards from using FT AKMs. With PSK offload support these
cards can do FT but only when offloading is used.
In the FW scan callback eapol was being stared unconditionally which
isn't correct as roaming on open networks is possible. Instead check
that a SM exists just like is done in netdev_connect_event.
This should have been updated along with the connect and roam
event separation. Since netdev_connect_event is not being
re-used for CMD_ROAM the comment did not make sense anymore.
Still, there needs to be a check to ensure we were not disconnected
while waiting for GET_SCAN to come back.
netdev_connect_event was being reused for parsing of CMD_ROAM
attributes which made some amount of sense since these events
are nearly identical, but due to the nature of firmware roaming
there really isn't much IWD needs to parse from CMD_ROAM. In
addition netdev_connect_event was getting rather complicated
since it had to handle both CMD_ROAM and CMD_CONNECT.
The only bits of information IWD needs to parse from CMD_ROAM
is the roamed BSSID, authenticator IEs, and supplicant IEs. Since
this is so limited it now makes little sense to reuse the entire
netdev_connect_event function, and intead only parse what is
needed for CMD_ROAM.
station should be isolated as much as possible from the details of the
driver type and how a particular AKM is handled under the hood. It will
be up to wiphy to pick the best AKM for a given bss. netdev in turn
will pick how to drive the particular AKM that was picked.
Currently netdev handles SoftMac and FullMac drivers mostly in the same
way, by building CMD_CONNECT nl80211 commands and letting the kernel
figure out the details. Exceptions to this are FILS/OWE/SAE AKMs which
are only supported on SoftMac drivers by using
CMD_AUTHENTICATE/CMD_ASSOCIATE.
Recently, basic support for SAE (WPA3-Personal) offload on FullMac cards
was introduced. When offloaded, the control flow is very different than
under typical conditions and required additional logic checks in several
places. The logic is now becoming quite complex.
Introduce a concept of a connection type in order to make it clearer
what driver and driver features are being used for this connection. In
the future, connection types can be expanded with 802.1X handshake
offload, PSK handshake offload and CMD_EXTERNAL_AUTH based SAE
connections.
Commit 6e8b76527 added a switch statement for AKM suites which
was not correct as this is a bitmask and may contain multiple
values. Intead we can rely on wiphy_select_akm which is a more
robust check anyways.
Fixes: 6e8b765278 ("wiphy: add check for CMD_AUTH/CMD_ASSOC support")
If there is an associate timeout, retry a few times in case
it was just a fluke. At this point SAE is fully negotiated
so it makes sense to attempt to save the connection.
Any auth proto which did not implement the assoc_timeout handler
could end up getting 'stuck' forever if there was an associate
timeout. This is because in the event of an associate timeout IWD
only sets a few flags and relies on the connect event to actually
handle the failure. The problem is a connect event never comes
if the failure was a timeout.
To fix this we can explicitly fail the connection if the auth
proto has not implemented assoc_timeout or if it returns false.
