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Do not disable 40 MHz based on co-ex report with matching primary channel

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When processing 20/40 BSS Coexistence Management frames that do not
explicitly require 40 MHz to be disabled, check whether the reported
channels in 20/40 BSS Intolerant Channel Report element match the
current primary channel. If so, allow 40 MHz operation to continue. This
makes the during-operation updates for 20/40 Operation Permitted more
consistent with the scans during initial BSS startup.

The received 20/40 BSS Intolerant Channel Report channels are to be used
in the OT set in the during-operation determination and the P == OT_i
exception was ignored in the previous implementation which could result
in the AP first starting with 40 MHz and then dropping to 20 MHz on
first received 20/40 BSS Coexistence Management frame even though there
was no change in the neighboring BSSs.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2018-03-21 16:58:05 +02:00 committed by Jouni Malinen
parent 8cbd9c3ed4
commit 10949e2480
1 changed files with 3 additions and 1 deletions
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4
src/ap/ieee802_11_ht.c
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@ -332,8 +332,10 @@ void hostapd_2040_coex_action(struct hostapd_data *hapd,
for (i = 0; i < ielen - 1; i++) {
u8 chan = ic_report->variable[i];
if (chan == iface->conf->channel)
continue; /* matching own primary channel */
if (is_40_allowed(iface, chan))
continue;
continue; /* not within affected channels */
hostapd_logger(hapd, mgmt->sa,
HOSTAPD_MODULE_IEEE80211,
HOSTAPD_LEVEL_DEBUG,