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Add bssid/freq hint for driver-based BSS selection

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This uses the new nl80211 attributes to allow the connect command to
provide bssid and freq hints to the driver without limiting roaming to
the specific BSS/frequency. This can be used by drivers that perform
internal BSS selection (WPA_DRIVER_FLAGS_BSS_SELECTION) as a candidate
for initial association.

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
This commit is contained in:
Dmitry Shmidt 2014-02-13 15:14:18 +02:00 committed by Jouni Malinen
parent 92484e2d79
commit 7ac7fd43aa
3 changed files with 35 additions and 0 deletions
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20
src/drivers/driver.h
View file

@ -403,6 +403,16 @@ struct wpa_driver_associate_params {
* responsible for selecting with which BSS to associate. */
const u8 *bssid;
/**
* bssid_hint - BSSID of a proposed AP
*
* This indicates which BSS has been found a suitable candidate for
* initial association for drivers that use driver/firmwate-based BSS
* selection. Unlike the @bssid parameter, @bssid_hint does not limit
* the driver from selecting other BSSes in the ESS.
*/
const u8 *bssid_hint;
/**
* ssid - The selected SSID
*/
@ -420,6 +430,16 @@ struct wpa_driver_associate_params {
*/
int freq;
/**
* freq_hint - Frequency of the channel the proposed AP is using
*
* This provides a channel on which a suitable BSS has been found as a
* hint for the driver. Unlike the @freq parameter, @freq_hint does not
* limit the driver from selecting other channels for
* driver/firmware-based BSS selection.
*/
int freq_hint;
/**
* bg_scan_period - Background scan period in seconds, 0 to disable
* background scan, or -1 to indicate no change to default driver

13
src/drivers/driver_nl80211.c
View file

@ -8391,6 +8391,13 @@ static int nl80211_connect_common(struct wpa_driver_nl80211_data *drv,
NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, params->bssid);
}
if (params->bssid_hint) {
wpa_printf(MSG_DEBUG, " * bssid_hint=" MACSTR,
MAC2STR(params->bssid_hint));
NLA_PUT(msg, NL80211_ATTR_MAC_HINT, ETH_ALEN,
params->bssid_hint);
}
if (params->freq) {
wpa_printf(MSG_DEBUG, " * freq=%d", params->freq);
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, params->freq);
@ -8398,6 +8405,12 @@ static int nl80211_connect_common(struct wpa_driver_nl80211_data *drv,
} else
drv->assoc_freq = 0;
if (params->freq_hint) {
wpa_printf(MSG_DEBUG, " * freq_hint=%d", params->freq_hint);
NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ_HINT,
params->freq_hint);
}
if (params->bg_scan_period >= 0) {
wpa_printf(MSG_DEBUG, " * bg scan period=%d",
params->bg_scan_period);

2
wpa_supplicant/wpa_supplicant.c
View file

@ -1656,6 +1656,8 @@ static void wpas_start_assoc_cb(struct wpa_radio_work *work, int deinit)
params.bssid = bss->bssid;
params.freq = bss->freq;
}
params.bssid_hint = bss->bssid;
params.freq_hint = bss->freq;
} else {
params.ssid = ssid->ssid;
params.ssid_len = ssid->ssid_len;