The actual connection piece of this is very minimal, and only
requires station to check if there is a PMKSA cached, and if so
include the PMKID in the RSNE. Netdev then takes care of the rest.
The remainder of this patch is the error handling if a PMKSA
connection fails with INVALID_PMKID. In this case IWD should retry
the same BSS without PMKSA.
An option was also added to disable PMKSA if a user wants to do
that. In theory PMKSA is actually less secure compared to SAE so
it could be something a user wants to disable. Going forward though
it will be enabled by default as its a requirement from the WiFi
alliance for WPA3 certification.
To prepare for PMKSA support station needs access to the handshake
object. This is because if PMKSA fails due to an expired/missing
PMKSA on the AP station should retry using the standard association.
This poses a problem currently because netdev frees the handshake
prior to calling the connect callback.
This was quite simple and only requiring caching the PMKSA after a
successful handshake, and using the correct authentication type
for connections if we have a prior PMKSA cached.
This is only being added for initial SAE associations for now since
this is where we gain the biggest improvement, in addition to the
requirement by the WiFi alliance to label products as "WPA3 capable"
This is needed in order to clear the PMKSA from the handshake state
without actually putting it back into the cache. This is something
that will be needed in case the AP rejects the association due to
an expired (or forgotten) PMKSA.
The majority of this patch was authored by Denis Kenzior, but
I have appended setting the PMK inside handshake_state_set_pmksa
as well as checking if the pmkid exists in
handshake_state_steal_pmkid.
Authored-by: Denis Kenzior <denkenz@gmail.com>
Authored-by: James Prestwood <prestwoj@gmail.com>
There are quite a few tests here for various scenarios and PMKSA
throws a wrench into that. Rather than potentially breaking the
tests in attempt to get them working with PMKSA, just disable PMKSA.
Since IWD doesn't utilize DBus signals in "normal" operations its
fine to lazy initialize any of the DBus interfaces since properties
can be obtained as needed with Get/GetAll.
For test-runner though StationDebug uses signals for debug events
and until the StationDebug class is initialized (via a method call
or property access) all signals will be lost. Fix this by always
initializing the StationDebug interface when a Device class is
initialized.
This adds a ref count to the handshake state object (as well as
ref/unref APIs). Currently IWD is careful to ensure that netdev
holds the root reference to the handshake state. Other modules do
track it themselves, but ensure that it doesn't get referenced
after netdev frees it.
Future work related to PMKSA will require that station holds a
references to the handshake state, specifically for retry logic,
after netdev is done with it so we need a way to delay the free
until station is also done.
The utilization rank factor already existed but was very rigid
and only checked a few values. This adds the (optional) ability
to start applying an exponentially decaying factor to both
utilization and station count after some threshold is reached.
This area needs to be re-worked in order to support very highly
loaded networks. If a network either doesn't support client
balancing or does it poorly its left up to the clients to choose
the best BSS possible given all the information available. In
these cases connecting to a highly loaded BSS may fail, or result
in a disconnect soon after connecting. In these cases its likely
better for IWD to choose a slightly lower RSSI/datarate BSS over
the conventionally 'best' BSS in order to aid in distributing
the network load.
The thresholds are currently optional and not enabled by default
but if set they behave as follows:
If the value is above the threshold it is mapped to an integer
between 0 and 30. (using a starting range of <value> - 255).
This integer is then used to index in the exponential decay table
to get a factor between 1 and 0. This factor is then applied to
the rank.
Note that as the value increases above the threshold the rank
will be increasingly effected, as is expected for an exponential
function. These option should be used with care as it may have
unintended consequences, especially with very high load networks.
i.e. you may see IWD roaming to BSS's with much lower signal if
there are high load BSS's nearby.
To maintain the existing behavior if there is no utilization
factor set in main.conf the legacy thresholds/factors will be
used.
This is copied from network.c that uses a static table to lookup
exponential decay values by index (generated from 1/pow(n, 0.3)).
network.c uses this for network ranking but it can be useful for
BSS ranking as well if you need to apply some exponential backoff
to a value.
This has been needed elsewhere but generally shortcuts could be
taken mapping with ranges starting/ending with zero. This is a
more general linear mapping utility to map values between any
two ranges.
gcc-15 switched to -std=c23 by default:
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=55e3bd376b2214e200fa76d12b67ff259b06c212
As a result `iwd` fails the build as:
../src/crypto.c:1215:24: error: incompatible types when returning type '_Bool' but 'struct l_ecc_point *' was expected
1215 | return false;
| ^~~~~
Signed-off-by: Rudi Heitbaum <rudi@heitbaum.com>
gcc-15 switched to -std=c23 by default:
https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=55e3bd376b2214e200fa76d12b67ff259b06c212
As a result `iwd` fails the build as:
wired/ethdev.c: In function 'pae_open':
wired/ethdev.c:340:55:
error: passing argument 4 of 'l_io_set_read_handler'
from incompatible pointer type [-Wincompatible-pointer-types]
340 | l_io_set_read_handler(pae_io, pae_read, NULL, pae_destroy);
| ^~~~~~~~~~~
| |
| void (*)(void)
In file included from ...-ell-0.70-dev/include/ell/ell.h:19,
from wired/ethdev.c:38:
...-ell-0.70-dev/include/ell/io.h:33:68:
note: expected 'l_io_destroy_cb_t' {aka 'void (*)(void *)'}
but argument is of type 'void (*)(void)'
33 | void *user_data, l_io_destroy_cb_t destroy);
| ~~~~~~~~~~~~~~~~~~^~~~~~~
C23 changed the meaning of `void (*)()` from partially defined prototype
to `void (*)(void)`.
The 3rd byte of the country code was being printed as ASCII but this
byte isn't always a printable character. Instead we can check what
the value is and describe what it means from the spec.
These frequencies were seen being advertised by a driver and IWD has
no operating class/channel mapping for them. Specifically 5960 was
causing issues due to a few bugs and mapping to channel 2 of the 6ghz
band. Those bugs have now been resolved.
If these frequencies can be supported in a clean manor we can remove
this test, but until then ensure IWD does not parse them.
After the band is established we check the e4 table for the channel
that matches. The problem here is we will end up checking all the
operating classes, even those that are not within the band that was
determined. This could result in false positives and return a
channel that doesn't make sense.
When the frequencies/channels were parsed there was no check that the
resulting band matched what was expected. Now, pass the band object
itself in which has the band set to what is expected.
If IPv6 is disabled or not supported at the kernel level writing the
sysfs settings will fail. A few of them had a support check but this
patch adds a supported bool to the remainder so we done get errors
like:
Unable to write drop_unsolicited_na to /proc/sys/net/ipv6/conf/wlan0/drop_unsolicited_na
Similar to several other modules DPP registers for its frame
watches on init then ignores anything is receives unless DPP
is actually running.
Due to some recent issues surrounding ath10k and multicast frames
it was discovered that simply registering for multicast RX frames
causes a significant performance impact depending on the current
channel load.
Regardless of the impact to a single driver, it is actually more
efficient to only register for the DPP frames when DPP starts
rather than when IWD initializes. This prevents any of the frames
from hitting userspace which would otherwise be ignored.
Using the frame-xchg group ID's we can only register for DPP
frames when needed, then close that group and the associated
frame watches.
DPP optionally uses the multicast RX flag for frame registrations but
since frame-xchg did not support that, it used its own registration
internally. To avoid code duplication within DPP add a flag to
frame_watch_add in order to allow DPP to utilize frame-xchg.
The selection loop was choosing an initial candidate purely for
use of the "fallback_to_blacklist" flag. But we have a similar
case with OWE transitional networks where we avoid the legacy
open network in preference for OWE:
/* Don't want to connect to the Open BSS if possible */
if (!bss->rsne)
continue;
If no OWE network gets selected we may iterate all BSS's and end
the loop, which then returns NULL.
To fix this move the blacklist check earlier and still ignore any
BSS's in the blacklist. Also add a new flag in the selection loop
indicating an open network was skipped. If we then exhaust all
other BSS's we can return this candidate.
Some drivers like brcmfmac don't support OWE but from userspace its
not possible to query this information. Rather than completely
blacklist brcmfmac we can allow the user to configure this and
disable OWE in IWD.
The "UK" alpha2 code is not the official code for the United Kingdom
but is a "reserved" code for compatibility. The official alpha2 is
"GB" which is being added to the EU list. This fixes issues parsing
neighbor reports, for example:
src/station.c:parse_neighbor_report() Neighbor report received for xx:xx:xx:xx:xx:xx: ch 136 (oper class 3), MD not set
Failed to find band with country string 'GB 32' and oper class 3, trying fallback
src/station.c:station_add_neighbor_report_freqs() Ignored: unsupported oper class
Test handling of technically illegal but harmless cloned IEs.
Based on real traffic captured from retail APs.
As cloned IEs are now allowed the
"/IE order/Bad (Duplicate + Out of Order IE) 1"
test payload has been altered to be more-wrong so it still fails
verification as expected.
Prior to adding the polling fallback this code path was only used for
signal level list notifications and netdev_rssi_polling_update() was
structured as such, where if the RSSI list feature existed there was
nothing to be done as the kernel handled the notifications.
For certain mediatek cards this is broken, hence why the fallback was
added. But netdev_rssi_polling_update() was never changed to take
this into account which bypassed the timer cleanup on disconnections
resulting in a crash when the timer fired after IWD was disconnected:
iwd: ++++++++ backtrace ++++++++
iwd: #0 0x7b5459642520 in /lib/x86_64-linux-gnu/libc.so.6
iwd: #1 0x7b54597aedf4 in /lib/x86_64-linux-gnu/libc.so.6
iwd: #2 0x49f82d in l_netlink_message_append() at ome/jprestwood/iwd/ell/netlink.c:825
iwd: #3 0x4a0c12 in l_genl_msg_append_attr() at ome/jprestwood/iwd/ell/genl.c:1522
iwd: #4 0x405c61 in netdev_rssi_poll() at ome/jprestwood/iwd/src/netdev.c:764
iwd: #5 0x49cce4 in timeout_callback() at ome/jprestwood/iwd/ell/timeout.c:70
iwd: #6 0x49c2ed in l_main_iterate() at ome/jprestwood/iwd/ell/main.c:455 (discriminator 2)
iwd: #7 0x49c3bc in l_main_run() at ome/jprestwood/iwd/ell/main.c:504
iwd: #8 0x49c5f0 in l_main_run_with_signal() at ome/jprestwood/iwd/ell/main.c:632
iwd: #9 0x4049ed in main() at ome/jprestwood/iwd/src/main.c:614
iwd: #10 0x7b5459629d90 in /lib/x86_64-linux-gnu/libc.so.6
iwd: #11 0x7b5459629e40 in /lib/x86_64-linux-gnu/libc.so.6
iwd: +++++++++++++++++++++++++++
To fix this we need to add checks for the cqm_poll_fallback flag in
netdev_rssi_polling_update().
Certain FullMAC drivers do not expose CMD_ASSOCIATE/CMD_AUTHENTICATE,
but lack the ability to fully offload SAE connections to the firmware.
Such connections can still be supported on such firmware by using
CMD_EXTERNAL_AUTH & CMD_FRAME. The firmware sets the
NL80211_FEATURE_SAE bit (which implies support for CMD_AUTHENTICATE, but
oh well), and no other offload extended features.
When CMD_CONNECT is issued, the firmware sends CMD_EXTERNAL_AUTH via
unicast to the owner of the connection. The connection owner is then
expected to send SAE frames with the firmware using CMD_FRAME and
receive authenticate frames using unicast CMD_FRAME notifications as
well. Once SAE authentication completes, userspace is expected to
send a final CMD_EXTERNAL_AUTH back to the kernel with the corresponding
status code. On failure, a non-0 status code should be used.
Note that for historical reasons, SAE AKM sent in CMD_EXTERNAL_AUTH is
given in big endian order, not CPU order as is expected!
