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Extract BSS coex 40 MHz check into a separate function

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Move this implementation from check_40mhz_2g4() into a new helper
function check_bss_coex_40mhz function() so that it can be used in the
station mode case as well as the previously used AP mode case.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
This commit is contained in:
Sergey Matyukevich 2019-03-19 12:35:56 +00:00 committed by Jouni Malinen
parent 6883f94408
commit 3af78a4e04
2 changed files with 80 additions and 62 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

141
src/common/hw_features_common.c
View file

@ -279,12 +279,87 @@ static int check_20mhz_bss(struct wpa_scan_res *bss, int pri_freq, int start,
}
/*
* Returns:
* 0: no impact
* 1: overlapping BSS
* 2: overlapping BSS with 40 MHz intolerant advertisement
*/
int check_bss_coex_40mhz(struct wpa_scan_res *bss, int pri_freq, int sec_freq)
{
int affected_start, affected_end;
struct ieee802_11_elems elems;
int pri_chan, sec_chan;
int pri = bss->freq;
int sec = pri;
if (pri_freq == sec_freq)
return 1;
affected_start = (pri_freq + sec_freq) / 2 - 25;
affected_end = (pri_freq + sec_freq) / 2 + 25;
/* Check for overlapping 20 MHz BSS */
if (check_20mhz_bss(bss, pri_freq, affected_start, affected_end)) {
wpa_printf(MSG_DEBUG, "Overlapping 20 MHz BSS is found");
return 1;
}
get_pri_sec_chan(bss, &pri_chan, &sec_chan);
if (sec_chan) {
if (sec_chan < pri_chan)
sec = pri - 20;
else
sec = pri + 20;
}
if ((pri < affected_start || pri > affected_end) &&
(sec < affected_start || sec > affected_end))
return 0; /* not within affected channel range */
wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
" freq=%d pri=%d sec=%d",
MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
if (sec_chan) {
if (pri_freq != pri || sec_freq != sec) {
wpa_printf(MSG_DEBUG,
"40 MHz pri/sec mismatch with BSS "
MACSTR
" <%d,%d> (chan=%d%c) vs. <%d,%d>",
MAC2STR(bss->bssid),
pri, sec, pri_chan,
sec > pri ? '+' : '-',
pri_freq, sec_freq);
return 1;
}
}
ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
if (elems.ht_capabilities) {
struct ieee80211_ht_capabilities *ht_cap =
(struct ieee80211_ht_capabilities *)
elems.ht_capabilities;
if (le_to_host16(ht_cap->ht_capabilities_info) &
HT_CAP_INFO_40MHZ_INTOLERANT) {
wpa_printf(MSG_DEBUG,
"40 MHz Intolerant is set on channel %d in BSS "
MACSTR, pri, MAC2STR(bss->bssid));
return 2;
}
}
return 0;
}
int check_40mhz_2g4(struct hostapd_hw_modes *mode,
struct wpa_scan_results *scan_res, int pri_chan,
int sec_chan)
{
int pri_freq, sec_freq;
int affected_start, affected_end;
size_t i;
if (!mode || !scan_res || !pri_chan || !sec_chan ||
@ -294,70 +369,12 @@ int check_40mhz_2g4(struct hostapd_hw_modes *mode,
pri_freq = hw_get_freq(mode, pri_chan);
sec_freq = hw_get_freq(mode, sec_chan);
affected_start = (pri_freq + sec_freq) / 2 - 25;
affected_end = (pri_freq + sec_freq) / 2 + 25;
wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
affected_start, affected_end);
(pri_freq + sec_freq) / 2 - 25,
(pri_freq + sec_freq) / 2 + 25);
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *bss = scan_res->res[i];
int pri = bss->freq;
int sec = pri;
struct ieee802_11_elems elems;
/* Check for overlapping 20 MHz BSS */
if (check_20mhz_bss(bss, pri_freq, affected_start,
affected_end)) {
wpa_printf(MSG_DEBUG,
"Overlapping 20 MHz BSS is found");
if (check_bss_coex_40mhz(scan_res->res[i], pri_freq, sec_freq))
return 0;
}
get_pri_sec_chan(bss, &pri_chan, &sec_chan);
if (sec_chan) {
if (sec_chan < pri_chan)
sec = pri - 20;
else
sec = pri + 20;
}
if ((pri < affected_start || pri > affected_end) &&
(sec < affected_start || sec > affected_end))
continue; /* not within affected channel range */
wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
" freq=%d pri=%d sec=%d",
MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
if (sec_chan) {
if (pri_freq != pri || sec_freq != sec) {
wpa_printf(MSG_DEBUG,
"40 MHz pri/sec mismatch with BSS "
MACSTR
" <%d,%d> (chan=%d%c) vs. <%d,%d>",
MAC2STR(bss->bssid),
pri, sec, pri_chan,
sec > pri ? '+' : '-',
pri_freq, sec_freq);
return 0;
}
}
ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems,
0);
if (elems.ht_capabilities) {
struct ieee80211_ht_capabilities *ht_cap =
(struct ieee80211_ht_capabilities *)
elems.ht_capabilities;
if (le_to_host16(ht_cap->ht_capabilities_info) &
HT_CAP_INFO_40MHZ_INTOLERANT) {
wpa_printf(MSG_DEBUG,
"40 MHz Intolerant is set on channel %d in BSS "
MACSTR, pri, MAC2STR(bss->bssid));
return 0;
}
}
}
return 1;

1
src/common/hw_features_common.h
View file

@ -29,6 +29,7 @@ void get_pri_sec_chan(struct wpa_scan_res *bss, int *pri_chan, int *sec_chan);
int check_40mhz_5g(struct wpa_scan_results *scan_res,
struct hostapd_channel_data *pri_chan,
struct hostapd_channel_data *sec_chan);
int check_bss_coex_40mhz(struct wpa_scan_res *bss, int pri_freq, int sec_freq);
int check_40mhz_2g4(struct hostapd_hw_modes *mode,
struct wpa_scan_results *scan_res, int pri_chan,
int sec_chan);