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Realtek RTL8821AU v5.12.5.2 (2021-07-08) Wireless Lan Driver for Linux

License: GNU General Public License v2.0

C 99.34% Makefile 0.63% Shell 0.03%

wpa3 hcxdumptool rtl8821au wpa-supplicant realtek aircrack-ng linux-driver kali-linux wi-fi hostapd

rtl8821au's Introduction

rtl8821au (8821au.ko)

Realtek RTL8821AU Wireless Lan Driver for Linux

v5.12.5.2 (20210708)
Based on EDIMAX EW-7811UTC Linux Driver (Version : 1.0.3.4) 2021-09-16
Support Kernel: 4.15 - 5.11 (Realtek)
Support up to Kernel 6.3

Specification

Supported interface modes:
- IBSS
- managed
- AP
- monitor
- P2P-client
- P2P-GO
Packet injection
TX power control
LED control
Power saving control
Driver debug log level control
VHT control
REGD source selection
Security:
- WEP 64/128-bit, WPA, WPA2, WPA3, and 802.1x

Supported adapters

Realtek RTL8811AU Wireless LAN 802.11ac USB 2.0 Network Adapter
Realtek RTL8821AU Wireless LAN 802.11ac USB 2.0 Network Adapter
Edimax EW-7811UTC
Edimax EW-7811UAC
Edimax EW-7811DAC
Edimax EW-7811USC
Edimax EW-7611UCB
I-O DATA WN-AC433UA Wireless LAN Adapter
D-Link DWA-171 rev A1 Wireless AC Dual Band Adapter
D-Link DWA-172 rev A1 Wireless AC600 Dual Band High-Gain USB Adapter
Hawking USB WLS 11AC Adapter
ELECOM WDC-433SU2M2 Wireless Adapter
ELECOM WDB-433SU2M2 Wireless Adapter
TRENDnet AC600 Dual Band Wireless USB Adapter
TP-LINK Archer T2U V3
TP-LINK Archer T2U Nano V1
TP-LINK Archer T2U Plus V1
I-O DATA Realtek Wireless LAN USB 2.0 5G Only Network Adapter
Planex GW-450S
Sitecom WiFi High Gain USB Adapter AC600
ELECOM WDC-433DU2H 11ac Wireless Adapter
Abocom 802.11ac Wireless LAN Card
I-O DATA WN-AC433UM Wireless LAN Adapter
I-O DATA WHG-AC433UM Wireless LAN Adapter
AirTies Air2520 Wireless USB Adapter
AirTies Air2525 Wireless USB Adapter
BUFFALO WI-U2-433DM Wireless LAN Adapter
BUFFALO WI-U2-433DHP Wireless Lan Adapter
BUFFALO WLP-U2-433DHP Wireless Lan Adapter
Netgear A6100
Obihai OBiWiFi

To support WiFi USB Adapter(s) with new vid/pid(s) which have rtl8821au or rtl8811au chipset.

Tested Linux Distros and Tools

Successful tested injection aireplay-ng -9 <interface>, deauthentication aireplay-ng -0 1 -a <bssid> <interface>.

NO fixed channel 1 issue.

Successful hcxdumptool driver test hcxdumptool -i <interface> --check_driver and capture packets hcxdumptool -i <interface> -o test.pcapng --filterlist_ap=targets.lst --filtermode=2 --enable_status=15 (hcxdumptool -i <interface> -o test.pcapng --filterlist=targets.lst --filtermode=2 --enable_status=15).

Connecting to AP with WPA3 (WPA3-SAE) authentication method (IMPORTANT: Test distro Ubuntu 22.04 kernel 5.15 - NetworkManager 1.36.4 nmcli tool, version 1.36.4. Otherwise use wpa_supplicant).

Start WPA3 (WPA3-SAE) SoftAP.

TX power control tested with SoftAP mode and OpenWrt firmware (OpenWrt 21.02.0 r16279-5cc0535800, Channel Analysis Feature).

Ubuntu 22.04 (kernel 5.19)
- Aircrack-ng 1.6
- hcxdumptool 6.2.6
- hostapd v2.11-devel-hostap_2_10-309-gc3d389b72
- wpa_supplicant v2.11-devel-hostap_2_10-309-gc3d389b72

Ubuntu 22.04 (kernel 5.18)

wpa_supplicant v2.11-devel-hostap_2_10-309-gc3d389b72
hostapd v2.11-devel-hostap_2_10-309-gc3d389b72
Aircrack-ng 1.6
hcxdumptool 6.2.6

Ubuntu 21.10 (kernel 5.17)

hostapd v2.11-devel-hostap_2_10-151-g3085e1a67
hcxdumptool 6.2.4
Aircrack-ng 1.6
wpa_supplicant v2.11-devel-hostap_2_10-151-g3085e1a67

Ubuntu 21.10 (kernel 5.16)

Aircrack-ng 1.6
hcxdumptool 6.2.4
wpa_supplicant v2.10-devel-hostap_2_9-2398-g8a54c252a
hostapd v2.10-devel-hostap_2_9-2398-g8a54c252a

Kali Linux 2021.3a (kernel 5.14)

Aircrack-ng 1.6
hcxdumptool 5.2.2
wpa_supplicant v2.10-devel-hostap_2_9-2433-g8d881d942

Kali Linux 2020.3 (kernel 5.9)

wpa_supplicant v2.10-devel-hostap_2_9-2379-g4775a5f82
hostapd v2.10-devel-hostap_2_9-2379-g4775a5f82
Aircrack-ng 1.6
hcxdumptool 6.1.4

Kali Linux 2019.1a (kernel 4.19)

Aircrack-ng 1.5.2
hcxdumptool 5.1.7
wpa_supplicant v2.10-devel-hostap_2_9-2433-g8d881d942

Ubuntu 21.10 (kernel 5.15)

wpa_supplicant v2.10-devel-hostap_2_9-2398-g8a54c252a
hostapd v2.10-devel-hostap_2_9-2398-g8a54c252a
Aircrack-ng 1.6
hcxdumptool 6.2.4

Ubuntu 21.10 (kernel 5.13)

Aircrack-ng 1.6
hcxdumptool 6.2.0
hostapd v2.10-devel-hostap_2_9-2398-g8a54c252a
wpa_supplicant v2.10-devel-hostap_2_9-2398-g8a54c252a

Ubuntu 12.04 (kernel 3.4)

Aircrack-ng 1.5.2
hcxdumptool 4.2.1

Ubuntu 11.10 (kernel 3.0)

Aircrack-ng 1.5.2
hcxdumptool 4.2.1

Linux Mint 20.2 MATE (kernel 5.4)

wpa_supplicant v2.10-devel-hostap_2_9-2486-gbb6fa62b3
hostapd v2.10-devel-hostap_2_9-2486-gbb6fa62b3
hcxdumptool 6.1.6
Aircrack-ng 1.6

Ubuntu 12.10 (kernel 3.5)

Aircrack-ng 1.5.2
hcxdumptool 4.2.1

Ubuntu 13.04 (kernel 3.8)

Aircrack-ng 1.5.2
hcxdumptool 5.1.4

Ubuntu 21.04 (kernel 5.11)

Aircrack-ng 1.6
hcxdumptool 6.1.6
wpa_supplicant v2.10-devel-hostap_2_9-2374-g9ef8491d9

HOW TO

Install

Download source:

git clone https://github.com/ivanovborislav/rtl8821au.git
cd rtl8821au

Install missing packages:

sudo apt-get install bc build-essential

Install linux headers:

sudo apt-get install linux-headers-$(uname -r)

apt-cache search linux-headers
sudo apt-get install linux-headers-5.14.0-kali4-amd64 (for example)
apt-cache search linux-image
sudo apt-get install linux-image-5.14.0-kali4-amd64 (for example)

Compile:

make
sudo make install

chmod +x install.sh
./install.sh -i

Raspberry Pi:

Edit Makefile:

Ln142 - CONFIG_PLATFORM_I386_PC = y to CONFIG_PLATFORM_I386_PC = n

Ln143 - CONFIG_PLATFORM_RPI_ARM = n to CONFIG_PLATFORM_RPI_ARM = y for ARM

Ln144 - CONFIG_PLATFORM_RPI_ARM64 = n to CONFIG_PLATFORM_RPI_ARM64 = y for ARM64

DKMS installation

sudo git clone "https://github.com/ivanovborislav/rtl8821au.git" /usr/src/rtl8821au-5.12.5.2
sudo dkms add -m rtl8821au -v 5.12.5.2
sudo dkms autoinstall
dkms status

sudo git clone "https://github.com/ivanovborislav/rtl8821au.git" /usr/src/rtl8821au-5.12.5.2
sudo dkms add -m rtl8821au -v 5.12.5.2
sudo dkms build -m rtl8821au -v 5.12.5.2
sudo dkms install -m rtl8821au -v 5.12.5.2
dkms status

Monitor mode

sudo airmon-ng check kill
sudo ip link set <interface> down
sudo iw dev <interface> set type monitor
sudo ip link set <interface> up

Managed mode

sudo ip link set <interface> down
sudo iw dev <interface> set type managed
sudo ip link set <interface> up
sudo systemctl restart NetworkManager (sudo service network-manager restart)

TX power control

Note: Set TX power before start SoftAP mode. ...set txpower fixed 3000 = txpower 30.00 dBm.

sudo iw dev <interface> set txpower fixed 3000

Driver options

Change driver options during inserting driver module

Remove (unload) a module from the Linux kernel.

sudo rmmod /lib/modules/$(uname -r)/kernel/drivers/net/wireless/8821au.ko

Insert (load) a module into the Linux kernel.

sudo insmod /lib/modules/$(uname -r)/kernel/drivers/net/wireless/8821au.ko rtw_ips_mode=1 rtw_drv_log_level=4 rtw_power_mgnt=2 rtw_led_ctrl=1

Change driver options loading from file

Create a file 8821au.conf containing options 8821au rtw_ips_mode=1 rtw_drv_log_level=4 rtw_power_mgnt=2 rtw_led_ctrl=1. Copy a file to /etc/modprobe.d/ directory.

sudo cp -f 8821au.conf /etc/modprobe.d

Power saving control.

IPS (Inactive Power Saving) Function, rtw_ips_mode=

0:Disable IPS
1:Enable IPS (default)

LPS (Leisure Power Saving) Function, rtw_power_mgnt=

0:Disable LPS
1:Enable LPS
2:Enable LPS with clock gating (default)

Driver debug log level control, rtw_drv_log_level=

0:_DRV_NONE_
1:_DRV_ALWAYS_
2:_DRV_ERR_
3:_DRV_WARNING_
4:_DRV_INFO_ (default)
5:_DRV_DEBUG_
6:_DRV_MAX_

Driver LED control, rtw_led_ctrl=

0:led off
1:led blink (default)
2:led on

Driver VHT control, rtw_vht_enable=

0:disable
1:enable (default)
2:force auto enable

Driver REGD source selection, rtw_regd_src=

0:Realtek defined
1:OS (default, get channel plan from OS)

Connecting with wpa_supplicant

Example wpa_supplicant.conf with WPA3-Personal (WPA3-SAE).

update_config=1
ctrl_interface=/var/run/wpa_supplicant
country=EN
p2p_no_group_iface=1
sae_groups=19 20 21

network={
	ssid="WPA3"
	proto=RSN
	key_mgmt=SAE
	pairwise=CCMP
	group=CCMP
	ieee80211w=2
	psk="1234567890"
}

Now start...

sudo systemctl stop NetworkManager
sudo killall wpa_supplicant
sudo wpa_supplicant -B -i <interface> -c wpa_supplicant.conf
sudo dhclient <interface>

Start SoftAP mode

Example hostapd.conf with WPA3-Personal (WPA3-SAE) 2.4GHz.

driver=nl80211
ctrl_interface=/var/run/hostapd
ctrl_interface_group=0
ssid=WPA3
country_code=EN
hw_mode=g
channel=6
beacon_int=100
dtim_period=1
max_num_sta=16
rts_threshold=2347
fragm_threshold=2346
ignore_broadcast_ssid=0
wmm_enabled=1
ieee80211n=1
ht_capab=[HT40-][SHORT-GI-20][SHORT-GI-40][RX-STBC1][MAX-AMSDU-7935][DSSS_CCK-40]

auth_algs=1
wpa=2
wpa_passphrase=1234567890
wpa_key_mgmt=SAE
wpa_pairwise=CCMP
rsn_pairwise=CCMP
ieee80211w=2
sae_groups=19 20 21
sae_require_mfp=1

Example hostapd.conf with WPA3-Personal (WPA3-SAE) 5GHz.

CAUTION: Allow width: 80 MHz, insmod 8821au.ko rtw_vht_enable=2.

driver=nl80211
ctrl_interface=/var/run/hostapd
ctrl_interface_group=0
ssid=WPA3_5GHz
country_code=EN
hw_mode=a
channel=36
beacon_int=100
dtim_period=1
max_num_sta=16
rts_threshold=2347
fragm_threshold=2346
ignore_broadcast_ssid=0
wmm_enabled=1
ieee80211n=1
ht_capab=[HT40+][SHORT-GI-20][SHORT-GI-40][MAX-AMSDU-7935][DSSS_CCK-40]
ieee80211ac=1
vht_capab=[MAX-MPDU-11454][SHORT-GI-80][RX-STBC1][SU-BEAMFORMEE][HTC-VHT][MAX-A-MPDU-LEN-EXP7]
vht_oper_chwidth=1
vht_oper_centr_freq_seg0_idx=42

auth_algs=1
wpa=2
wpa_passphrase=1234567890
wpa_key_mgmt=SAE
wpa_pairwise=CCMP
rsn_pairwise=CCMP
ieee80211w=2
sae_groups=19 20 21
sae_require_mfp=1

Now start...

sudo killall hostapd
sudo hostapd -i <interface> hostapd.conf

Kali NetHunter Kernel module Samsung Galaxy S5

Test devices

TP-Link Archer T2U Plus V1
Linksys WRT1200AC V2
- OpenWrt 21.02.0 r16279-5cc0535800 / LuCI openwrt-21.02 branch git-21.231.26241-422c175

config wifi-iface 'default_radio1'
	option device 'radio1'
	option network 'lan'
	option mode 'ap'
	option macaddr '30:23:03:XX:XX:XX'
	option ssid 'WPA3'
	option encryption 'sae'
	option key '1234567890'
	option ieee80211w '2'

rtl8821au's People

Contributors

Stargazers

Watchers

Forkers

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rtl8821au's Issues

Problems updating rtl8821au - NEWBIE

I update Linux Mint to 21 Vanessa, and my wifi stopped working. So I reverted back using TimeShift and found your github update page. Hopefully after updating the wifi driver, I can update the OS again, this time with wifi.

I followed your instructions, but now dkms status returns:
rtl8821au, 5.12.5.2, 5.4.0-144-generic, x86_64: installed (WARNING! Diff between built and installed module!)
rtl8821au, 5.8.2.3, 5.4.0-139-generic, x86_64: installed
rtl8821au, 5.8.2.3, 5.4.0-144-generic, x86_64: built

Not really what I expected.

What did I do wrong? And how do I fix this?

Many thanks in advance
Rudizoon

cannot activate 5g on D-link daw-182 rev D.1 chipset: RTL8812BU

This driver was only one that worked for me but I still can activate 5g on my ubuntu

I made file 88x2bu.conf in /etc/modprobe.d
the led control is set to 2 in order to test if the file has any effect on the wifi adapter

in this file is:

options 88x2bu
rtw_ips_mode=1
rtw_drv_log_level=4
rtw_power_mgnt=2
rtw_led_ctrl=2
rtw_wireless_mode=16

I tried without the first line because I am not sure about it : options 88x2bu
second try with 88x2bu.conf in /etc/modprobe.d:

rtw_ips_mode=1
rtw_drv_log_level=4
rtw_power_mgnt=2
rtw_led_ctrl=2
rtw_wireless_mode=16

my ubuntu version (uname -a):

Linux a-MacBookPro 5.19.0-41-generic #42~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Apr 18 17:40:00 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

output of iwconfig:

lo        no wireless extensions.

enp2s0f0  no wireless extensions.

wlp3s0    IEEE 802.11  ESSID:"XXX"
          Mode:Managed  Frequency:5.24 GHz  Access Point: XX:XX:XX:XX:XX:XX
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

wlxa0a3f0ca408e  unassociated  Nickname:"<WIFI@REALTEK>"
          Mode:Managed  Frequency=**2.412 GHz**  Access Point: Not-Associated
          Sensitivity:0/0
          Retry:off   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

I tried other rtw_wireless_modes but every time it was set to 2.412 GHz

any help is much appreciated

Problem with Kernel 6.1.39

Hi I got error when try to install drivers on NixOS

/build/source/os_dep/linux/wifi_regd.c: In function 'rtw_regd_init':
/build/source/os_dep/linux/wifi_regd.c:409:36: error: 'REGULATORY_IGNORE_STALE_KICKOFF' undeclared (first use in this function)
  409 |         wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
      |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I think I have found something close
morrownr/88x2bu-20210702#165

Not found on openwrt

Could you upload this driver to openwrt?
I didn't found it there.

Issue when using combination of AP + Wifi

Hello,

I have a wifi dongle using this driver.
If I set up (using nmcli) a wifi hotspot on wlan0 then a wifi connection on a virtual interface wlan1 (created from wlan0). I'm disconnected from the Hotspot after a while and can't connect to it anymore.

If I set up the wifi connection on wlan1 first (and then the hotspot), it works perfectly.

Any hint ?

Error compiling - Raspberry pi OS

I have compiled this multiple times on different computers and raspberry pis. It seems that on the latest raspberry pi os it breaks. I believe that @Aidne46 was having the same issue on raspberry pi os.

Any help or patches would be great!

Command that I ran
./install.sh -i

Log

#make -C /lib/modules/6.1.0-rpi6-rpi-v8/build M=/home/pi/rtl8821au clean
cd hal ; rm -fr */*/*/*.mod.c */*/*/*.mod */*/*/*.o */*/*/.*.cmd */*/*/*.ko
cd hal ; rm -fr */*/*.mod.c */*/*.mod */*/*.o */*/.*.cmd */*/*.ko
cd hal ; rm -fr */*.mod.c */*.mod */*.o */.*.cmd */*.ko
cd hal ; rm -fr *.mod.c *.mod *.o .*.cmd *.ko
cd core ; rm -fr */*.mod.c */*.mod */*.o */.*.cmd */*.ko
cd core ; rm -fr *.mod.c *.mod *.o .*.cmd *.ko
cd os_dep/linux ; rm -fr *.mod.c *.mod *.o .*.cmd *.ko
cd os_dep ; rm -fr *.mod.c *.mod *.o .*.cmd *.ko
cd platform ; rm -fr *.mod.c *.mod *.o .*.cmd *.ko
rm -fr Module.symvers ; rm -fr Module.markers ; rm -fr modules.order
rm -fr *.mod.c *.mod *.o .*.cmd *.ko *~
rm -fr .tmp_versions
make ARCH=arm64 CROSS_COMPILE= -C /lib/modules/6.1.0-rpi6-rpi-v8/build M=/home/pi/rtl8821au  modules
make[1]: Entering directory '/usr/src/linux-headers-6.1.0-rpi6-rpi-v8'
  CC [M]  /home/pi/rtl8821au/core/rtw_cmd.o
  CC [M]  /home/pi/rtl8821au/core/rtw_security.o
  CC [M]  /home/pi/rtl8821au/core/rtw_debug.o
  CC [M]  /home/pi/rtl8821au/core/rtw_io.o
  CC [M]  /home/pi/rtl8821au/core/rtw_ioctl_query.o
  CC [M]  /home/pi/rtl8821au/core/rtw_ioctl_set.o
  CC [M]  /home/pi/rtl8821au/core/rtw_ieee80211.o
  CC [M]  /home/pi/rtl8821au/core/rtw_mlme.o
  CC [M]  /home/pi/rtl8821au/core/rtw_mlme_ext.o
  CC [M]  /home/pi/rtl8821au/core/rtw_mi.o
  CC [M]  /home/pi/rtl8821au/core/rtw_wlan_util.o
  CC [M]  /home/pi/rtl8821au/core/rtw_vht.o
  CC [M]  /home/pi/rtl8821au/core/rtw_pwrctrl.o
  CC [M]  /home/pi/rtl8821au/core/rtw_rf.o
  CC [M]  /home/pi/rtl8821au/core/rtw_chplan.o
  CC [M]  /home/pi/rtl8821au/core/monitor/rtw_radiotap.o
  CC [M]  /home/pi/rtl8821au/core/rtw_recv.o
  CC [M]  /home/pi/rtl8821au/core/rtw_sta_mgt.o
  CC [M]  /home/pi/rtl8821au/core/rtw_ap.o
  CC [M]  /home/pi/rtl8821au/core/wds/rtw_wds.o
  CC [M]  /home/pi/rtl8821au/core/mesh/rtw_mesh.o
  CC [M]  /home/pi/rtl8821au/core/mesh/rtw_mesh_pathtbl.o
  CC [M]  /home/pi/rtl8821au/core/mesh/rtw_mesh_hwmp.o
  CC [M]  /home/pi/rtl8821au/core/rtw_xmit.o
  CC [M]  /home/pi/rtl8821au/core/rtw_p2p.o
  CC [M]  /home/pi/rtl8821au/core/rtw_rson.o
  CC [M]  /home/pi/rtl8821au/core/rtw_tdls.o
  CC [M]  /home/pi/rtl8821au/core/rtw_br_ext.o
In function ‘__nat25_add_pppoe_tag’,
    inlined from ‘nat25_db_handle’ at /home/pi/rtl8821au/core/rtw_br_ext.c:1172:11:
/home/pi/rtl8821au/core/rtw_br_ext.c:120:9: warning: ‘memcpy’ reading between 2052 and 9220 bytes from a region of size 40 [-Wstringop-overread]
  120 |         memcpy((unsigned char *)ph->tag, tag, data_len);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/pi/rtl8821au/core/rtw_br_ext.c: In function ‘nat25_db_handle’:
/home/pi/rtl8821au/core/rtw_br_ext.c:1141:63: note: source object ‘tag_buf’ of size 40
 1141 |                                                 unsigned char tag_buf[40];
      |                                                               ^~~~~~~
  CC [M]  /home/pi/rtl8821au/core/rtw_iol.o
  CC [M]  /home/pi/rtl8821au/core/rtw_sreset.o
  CC [M]  /home/pi/rtl8821au/core/rtw_btcoex_wifionly.o
  CC [M]  /home/pi/rtl8821au/core/rtw_btcoex.o
  CC [M]  /home/pi/rtl8821au/core/rtw_beamforming.o
  CC [M]  /home/pi/rtl8821au/core/rtw_odm.o
  CC [M]  /home/pi/rtl8821au/core/rtw_rm.o
  CC [M]  /home/pi/rtl8821au/core/rtw_rm_fsm.o
  CC [M]  /home/pi/rtl8821au/core/rtw_ft.o
  CC [M]  /home/pi/rtl8821au/core/rtw_wnm.o
  CC [M]  /home/pi/rtl8821au/core/rtw_mbo.o
  CC [M]  /home/pi/rtl8821au/core/rtw_rm_util.o
  CC [M]  /home/pi/rtl8821au/core/efuse/rtw_efuse.o
  CC [M]  /home/pi/rtl8821au/core/rtw_roch.o
  CC [M]  /home/pi/rtl8821au/core/crypto/aes-internal.o
  CC [M]  /home/pi/rtl8821au/core/crypto/aes-internal-enc.o
  CC [M]  /home/pi/rtl8821au/core/crypto/aes-gcm.o
  CC [M]  /home/pi/rtl8821au/core/crypto/aes-ccm.o
  CC [M]  /home/pi/rtl8821au/core/crypto/aes-omac1.o
  CC [M]  /home/pi/rtl8821au/core/crypto/ccmp.o
  CC [M]  /home/pi/rtl8821au/core/crypto/gcmp.o
  CC [M]  /home/pi/rtl8821au/core/crypto/aes-siv.o
  CC [M]  /home/pi/rtl8821au/core/crypto/aes-ctr.o
  CC [M]  /home/pi/rtl8821au/core/crypto/sha256-internal.o
  CC [M]  /home/pi/rtl8821au/core/crypto/sha256.o
  CC [M]  /home/pi/rtl8821au/core/crypto/sha256-prf.o
  CC [M]  /home/pi/rtl8821au/core/crypto/rtw_crypto_wrap.o
  CC [M]  /home/pi/rtl8821au/core/rtw_swcrypto.o
  CC [M]  /home/pi/rtl8821au/os_dep/osdep_service.o
  CC [M]  /home/pi/rtl8821au/os_dep/linux/os_intfs.o
  CC [M]  /home/pi/rtl8821au/os_dep/linux/usb_intf.o
  CC [M]  /home/pi/rtl8821au/os_dep/linux/usb_ops_linux.o
  CC [M]  /home/pi/rtl8821au/os_dep/linux/ioctl_linux.o
  CC [M]  /home/pi/rtl8821au/os_dep/linux/xmit_linux.o
  CC [M]  /home/pi/rtl8821au/os_dep/linux/mlme_linux.o
  CC [M]  /home/pi/rtl8821au/os_dep/linux/recv_linux.o
  CC [M]  /home/pi/rtl8821au/os_dep/linux/ioctl_cfg80211.o
  CC [M]  /home/pi/rtl8821au/os_dep/linux/rtw_cfgvendor.o
  CC [M]  /home/pi/rtl8821au/os_dep/linux/wifi_regd.o
/home/pi/rtl8821au/os_dep/linux/wifi_regd.c: In function ‘rtw_regd_init’:
/home/pi/rtl8821au/os_dep/linux/wifi_regd.c:409:36: error: ‘REGULATORY_IGNORE_STALE_KICKOFF’ undeclared (first use in this function)
  409 |         wiphy->regulatory_flags |= REGULATORY_IGNORE_STALE_KICKOFF;
      |                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/pi/rtl8821au/os_dep/linux/wifi_regd.c:409:36: note: each undeclared identifier is reported only once for each function it appears in
make[2]: *** [/usr/src/linux-headers-6.1.0-rpi6-common-rpi/scripts/Makefile.build:255: /home/pi/rtl8821au/os_dep/linux/wifi_regd.o] Error 1
make[1]: *** [/usr/src/linux-headers-6.1.0-rpi6-common-rpi/Makefile:2039: /home/pi/rtl8821au] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-6.1.0-rpi6-rpi-v8'
make: *** [Makefile:2479: modules] Error 2
Install error: 2```

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