On 28.05.24 10:21, Linux regression tracking (Thorsten Leemhuis) wrote: > 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. >> [...] Hmm, the wifi developers did not reply to the inquiry quoted below. :-/ Guess I'll have to take a closer look a the linked bugzilla report then. Anyway: Christian, Savyasaachi, I noticed a submission of a patch referencing the culprit with a Fixes: tag; it talks about package loss, but it still made me wonder if that might be related somehow: https://lore.kernel.org/all/1fabb8e4-adf3-47ae-8462-8aea963bc2a5@xxxxxxxxx/ Ciao, Thorsten > 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. > >
