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WNM: 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..169 --> 5 GHz) if invalid
op_class == 0 is received in a BSS Transition Management Request. This
speeds up the following operating by avoiding a full scan due to an
unknown channel.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2016-02-05 17:06:06 +02:00 committed by Jouni Malinen
parent af060932de
commit 80ce804e88
1 changed files with 16 additions and 1 deletions
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17
wpa_supplicant/wnm_sta.c
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@ -429,6 +429,7 @@ static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
{
struct wpa_bss *bss = wpa_s->current_bss;
const char *country = NULL;
int freq;
if (bss) {
const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY);
@ -437,7 +438,21 @@ static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
country = (const char *) (elem + 2);
}
return ieee80211_chan_to_freq(country, op_class, chan);
freq = ieee80211_chan_to_freq(country, op_class, chan);
if (freq <= 0 && op_class == 0) {
/*
* Some APs do not advertise correct operating class
* information. Try to determine the most likely operating
* frequency based on the channel number.
*/
if (chan >= 1 && chan <= 13)
freq = 2407 + chan * 5;
else if (chan == 14)
freq = 2484;
else if (chan >= 36 && chan <= 169)
freq = 5000 + chan * 5;
}
return freq;
}