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hostapd: Fix opclass during CSA with DFS channels

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During CSA with DFS channels, disable, enable interface is a part of the
algorithm. When interface was enabled old operating class before switch
and new channel were used causing mismatch in
configured_fixed_chan_to_freq() function.

Example of log when switch from channel 157 to 108 was triggered:
"Could not convert op_class 124 channel 108 to operating frequency"

Fixes: bb781c763 ("AP: Populate iface->freq before starting AP")
Signed-off-by: Marek Kwaczynski <marek@mazekey.pl>
This commit is contained in:
marek@mazekey.pl 2024-04-23 11:08:08 +02:00 committed by Jouni Malinen
parent 93a3c59ad9
commit 816e22bba1
1 changed files with 10 additions and 0 deletions
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10
src/ap/hostapd.c
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@ -4507,6 +4507,7 @@ hostapd_switch_channel_fallback(struct hostapd_iface *iface,
{
u8 seg0_idx = 0, seg1_idx = 0;
enum oper_chan_width bw = CONF_OPER_CHWIDTH_USE_HT;
u8 op_class, chan = 0;
wpa_printf(MSG_DEBUG, "Restarting all CSA-related BSSes");
@ -4546,6 +4547,15 @@ hostapd_switch_channel_fallback(struct hostapd_iface *iface,
iface->freq = freq_params->freq;
iface->conf->channel = freq_params->channel;
iface->conf->secondary_channel = freq_params->sec_channel_offset;
if (ieee80211_freq_to_channel_ext(freq_params->freq,
freq_params->sec_channel_offset, bw,
&op_class, &chan) ==
NUM_HOSTAPD_MODES ||
chan != freq_params->channel)
wpa_printf(MSG_INFO, "CSA: Channel mismatch: %d -> %d",
freq_params->channel, chan);
iface->conf->op_class = op_class;
hostapd_set_oper_centr_freq_seg0_idx(iface->conf, seg0_idx);
hostapd_set_oper_centr_freq_seg1_idx(iface->conf, seg1_idx);
hostapd_set_oper_chwidth(iface->conf, bw);