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nl80211: Support setting sched scan RSSI threshold

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Allow the user to configure an RSSI threshold in dBm below which the
nl80211 driver won't report scan results. Currently only supported
during scheduled (PNO) scans.

Signed-off-by: Thomas Pedersen <c_tpeder@qca.qualcomm.com>
Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Thomas Pedersen 2012-07-25 16:56:43 +03:00 committed by Jouni Malinen
parent cae2119c86
commit bf8d6d2430
5 changed files with 37 additions and 2 deletions
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9
src/drivers/driver.h
View file

@ -273,6 +273,15 @@ struct wpa_driver_scan_params {
*/
size_t num_filter_ssids;
/**
* filter_rssi - Filter by RSSI
*
* The driver may filter scan results in firmware to reduce host
* wakeups and thereby save power. Specify the RSSI threshold in s32
* dBm.
*/
s32 filter_rssi;
/**
* p2p_probe - Used to disable CCK (802.11b) rates for P2P probes
*

18
src/drivers/driver_nl80211.c
View file

@ -3612,6 +3612,7 @@ static int wpa_driver_nl80211_sched_scan(void *priv,
struct wpa_driver_nl80211_data *drv = bss->drv;
int ret = 0;
struct nl_msg *msg, *ssids, *freqs, *match_set_ssid, *match_sets;
struct nl_msg *match_set_rssi;
size_t i;
#ifdef ANDROID
@ -3640,8 +3641,9 @@ static int wpa_driver_nl80211_sched_scan(void *priv,
NLA_PUT_U32(msg, NL80211_ATTR_SCHED_SCAN_INTERVAL, interval);
if (drv->num_filter_ssids &&
(int) drv->num_filter_ssids <= drv->capa.max_match_sets) {
if ((drv->num_filter_ssids &&
(int) drv->num_filter_ssids <= drv->capa.max_match_sets) ||
params->filter_rssi) {
match_sets = nlmsg_alloc();
for (i = 0; i < drv->num_filter_ssids; i++) {
@ -3661,6 +3663,18 @@ static int wpa_driver_nl80211_sched_scan(void *priv,
nlmsg_free(match_set_ssid);
}
if (params->filter_rssi) {
match_set_rssi = nlmsg_alloc();
NLA_PUT_U32(match_set_rssi,
NL80211_SCHED_SCAN_MATCH_ATTR_RSSI,
params->filter_rssi);
wpa_printf(MSG_MSGDUMP,
"nl80211: Sched scan RSSI filter %d dBm",
params->filter_rssi);
nla_put_nested(match_sets, 0, match_set_rssi);
nlmsg_free(match_set_rssi);
}
nla_put_nested(msg, NL80211_ATTR_SCHED_SCAN_MATCH,
match_sets);
nlmsg_free(match_sets);

1
wpa_supplicant/config.c
View file

@ -2908,6 +2908,7 @@ static const struct global_parse_data global_fields[] = {
{ INT(bss_expiration_age), 0 },
{ INT(bss_expiration_scan_count), 0 },
{ INT_RANGE(filter_ssids, 0, 1), 0 },
{ INT_RANGE(filter_rssi, -100, 0), 0 },
{ INT(max_num_sta), 0 },
{ INT_RANGE(disassoc_low_ack, 0, 1), 0 },
#ifdef CONFIG_HS20

8
wpa_supplicant/config.h
View file

@ -574,6 +574,14 @@ struct wpa_config {
*/
int filter_ssids;
/**
* filter_rssi - RSSI-based scan result filtering
*
* 0 = do not filter scan results
* -n = filter scan results below -n dBm
*/
int filter_rssi;
/**
* max_num_sta - Maximum number of STAs in an AP/P2P GO
*/

3
wpa_supplicant/ctrl_iface.c
View file

@ -98,6 +98,9 @@ static int pno_start(struct wpa_supplicant *wpa_s)
ssid = ssid->next;
}
if (wpa_s->conf->filter_rssi)
params.filter_rssi = wpa_s->conf->filter_rssi;
ret = wpa_drv_sched_scan(wpa_s, &params, 10 * 1000);
os_free(params.filter_ssids);
if (ret == 0)