On 28.05.24 00:01, Christian Heusel wrote: > > Savyasaachi reports that scanning for other stations in monitor mode > does not work anymore with his RTL8821CE wireless network card for linux > kernels after 6.8.9. > [...] So back to the real problem: @wifi developers: Is there some bigger problem in 6.9.y related to monitoring mode that is affecting a lot of drivers/users? I'm asking because I noticed another report that sounded related. To quote: https://bugzilla.kernel.org/show_bug.cgi?id=218884 """ > Michael 2024-05-24 17:04:51 UTC > > Some features are broken since kernel 6.9.1 when running monitor mode. > > First bug: > Switching a channel via "NL80211_ATTR_WIPHY_FREQ" does not switch the channel/frequency. > > That is not a device driver problem, because all device drivers (Mediatek, Ralink, Realtek, ...) are affected. > > To reproduce: > set monitor mode (by iw) > change channel (by iw) > check if channel has been changed (by iw) > record traffic and check radiotap header (Channel frequency) > > More information is here: > https://github.com/ZerBea/hcxdumptool/discussions/454 > https://github.com/morrownr/8821au-20210708/issues/133#issuecomment-2125425552 > confirmed by other users: > https://github.com/morrownr/8821au-20210708/issues/133#issuecomment-2125392151 > > > Second bug: > frame injection is broken > > To reproduce: > Try to send a 80211 frame via raw socket (PF_PACKET). It is not transmitted over the air > https://github.com/ZerBea/hcxdumptool/discussions/454 > > > In monitor mode, none of the WiFI tools (iw, Wireshark, airodump-ng, aireplay-ng, hcxdumptool, hcxlabtool is able to switshc the channel or to transmit 80211 frames since kernel 6.9 > > [tag] [reply] [−] > Private > Comment 1 Michael 2024-05-26 09:00:58 UTC > > BTW: > Testing monitor mode mode these days is no easy task, because most of the device drivers are not working as expected: > https://bugzilla.kernel.org/show_bug.cgi?id=218528 > https://bugzilla.kernel.org/show_bug.cgi?id=217465 > https://bugzilla.kernel.org/show_bug.cgi?id=218528 > https://github.com/openwrt/mt76/issues/839 > > And now, since kernel 6.9.1, the mac stack is broken, too. > """ Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr If I did something stupid, please tell me, as explained on that page.
