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WNM: Extend workaround for broken AP operating class behavior

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Some APs do not advertise operating classes correctly for BSS Transition
Management. Try to determine the most likely operating frequency based
on the channel number (1..14 --> 2.4 GHz; 36..177 --> 5 GHz) if invalid
op_class == 255 is received in a BSS Transition Management Request. This
speeds up the following operating by avoiding a full scan due to an
unknown channel.

This extends the workaround that was added in commit 80ce804e88 ("WNM:
Workaround for broken AP operating class behavior") for invalid
operating class 0 to cover another observed case with invalid operating
class 255.

Signed-off-by: Yu Zhang(Yuriy) <quic_yuzha@quicinc.com>
This commit is contained in:
Yu Zhang(Yuriy) 2024-08-01 18:37:25 +08:00 committed by Jouni Malinen
parent e900bcb149
commit 72ac0ee026
1 changed files with 1 additions and 1 deletions
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2
wpa_supplicant/wnm_sta.c
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@ -555,7 +555,7 @@ static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
} }
freq = ieee80211_chan_to_freq(country, op_class, chan); freq = ieee80211_chan_to_freq(country, op_class, chan);
if (freq <= 0 && op_class == 0) { if (freq <= 0 && (op_class == 0 || op_class == 255)) {
/* /*
* Some APs do not advertise correct operating class * Some APs do not advertise correct operating class
* information. Try to determine the most likely operating * information. Try to determine the most likely operating