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Date:   Wed, 05 May 2021 12:05:34 +0000
To:     "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
From:   Michael Yartys <michael.yartys@protonmail.com>
Reply-To: Michael Yartys <michael.yartys@protonmail.com>
Subject: Possible bug in iwlwifi
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Hello

I've been testing out WPA3/WPA2-mixed networks on my OpenWrt router, and I =
noticed whenever I enable 802.11r the network doesn't show up in the list o=
f Wi-Fi networks in NetworkManager. I initially thought this was due to som=
e bug with wpa_supplicant, but running "iw dev wlp18s0 scan" also fails to =
list the network. If I'm not mistaken, iw doesn't use wpa_supplicant to sca=
n for networks, so that rules out wpa_supplicant. That means something deep=
er in the stack is causing this, and my guess falls on iwlwifi. I'm listing=
 what I think is relevant system info below (please let me know if there's =
anything else that's missing):

Distro: Fedora 34
Kernel: 5.11.17-300.fc34.x86_64

$ sudo lshw -C network
  *-network
       description: Wireless interface
       product: Wireless 7260
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:12:00.0
       logical name: wlp18s0
       version: bb
       serial: redacted
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physica=
l wireless
       configuration: broadcast=3Dyes driver=3Diwlwifi driverversion=3D5.11=
.17-300.fc34.x86_64 firmware=3D17.3216344376.0 7260-17.ucode ip=3D192.168.1=
.202 latency=3D0 link=3Dyes multicast=3Dyes wireless=3DIEEE 802.11
       resources: irq:31 memory:fe500000-fe501fff

---------------------------------------------------------------------------=
--------------------------

This is what "iw dev wlp18s0 scan" outputs when 802.11r is disabled and it'=
s able to see the network:

BSS "redacted"(on wlp18s0)
=09last seen: 6947.060s [boottime]
=09TSF: 0 usec (0d, 00:00:00)
=09freq: 2412
=09beacon interval: 100 TUs
=09capability: ESS Privacy ShortPreamble ShortSlotTime (0x0431)
=09signal: -45.00 dBm
=09last seen: 5142 ms ago
=09Information elements from Probe Response frame:
=09SSID: OpenWrt_
=09Supported rates: 6.0* 9.0 12.0* 18.0 24.0* 36.0 48.0 54.0
=09DS Parameter set: channel 1
=09Country: NO=09Environment: Indoor/Outdoor
=09=09Channels [1 - 13] @ 20 dBm
=09ERP: <no flags>
=09RSN:=09 * Version: 1
=09=09 * Group cipher: CCMP
=09=09 * Pairwise ciphers: CCMP
=09=09 * Authentication suites: PSK PSK/SHA-256 SAE
=09=09 * Capabilities: 16-PTKSA-RC 1-GTKSA-RC MFP-capable (0x008c)
=09BSS Load:
=09=09 * station count: 0
=09=09 * channel utilisation: 15/255
=09=09 * available admission capacity: 0 [*32us]
=09Supported operating classes:
=09=09 * current operating class: 81
=09HT capabilities:
=09=09Capabilities: 0x19ed
=09=09=09RX LDPC
=09=09=09HT20
=09=09=09SM Power Save disabled
=09=09=09RX HT20 SGI
=09=09=09RX HT40 SGI
=09=09=09TX STBC
=09=09=09RX STBC 1-stream
=09=09=09Max AMSDU length: 7935 bytes
=09=09=09DSSS/CCK HT40
=09=09Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
=09=09Minimum RX AMPDU time spacing: 8 usec (0x06)
=09=09HT TX/RX MCS rate indexes supported: 0-31
=09HT operation:
=09=09 * primary channel: 1
=09=09 * secondary channel offset: no secondary
=09=09 * STA channel width: 20 MHz
=09=09 * RIFS: 0
=09=09 * HT protection: nonmember
=09=09 * non-GF present: 0
=09=09 * OBSS non-GF present: 1
=09=09 * dual beacon: 0
=09=09 * dual CTS protection: 0
=09=09 * STBC beacon: 0
=09=09 * L-SIG TXOP Prot: 0
=09=09 * PCO active: 0
=09=09 * PCO phase: 0
=09Extended capabilities:
=09=09 * Extended Channel Switching
=09=09 * SSID List
=09=09 * UTF-8 SSID
=09=09 * Operating Mode Notification
=09Unknown IE (244): 20
=09WMM:=09 * Parameter version 1
=09=09 * u-APSD
=09=09 * BE: CW 15-1023, AIFSN 3
=09=09 * BK: CW 15-1023, AIFSN 7
=09=09 * VI: CW 7-15, AIFSN 2, TXOP 3008 usec
=09=09 * VO: CW 3-7, AIFSN 2, TXOP 1504 usec

Michael Yartys