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nl80211: Allow driver-based roam to change ESS 

This extends NL80211_CMD_ROAM event processing to allow the driver to
roam to another ESS (different SSID) when using offloaded BSS selection.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Krishna Vamsi 2015-03-13 17:59:20 +05:30 committed by Jouni Malinen
parent 05121d3564
commit c41d0840a1
4 changed files with 35 additions and 2 deletions
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1
src/drivers/driver_nl80211.h
View File

@ -270,5 +270,6 @@ int wpa_driver_nl80211_sched_scan(void *priv,
int wpa_driver_nl80211_stop_sched_scan(void *priv);
struct wpa_scan_results * wpa_driver_nl80211_get_scan_results(void *priv);
void nl80211_dump_scan(struct wpa_driver_nl80211_data *drv);
const u8 * nl80211_get_ie(const u8 *ies, size_t ies_len, u8 ie);
#endif /* DRIVER_NL80211_H */

11
src/drivers/driver_nl80211_event.c
View File

@ -271,6 +271,7 @@ static void mlme_event_connect(struct wpa_driver_nl80211_data *drv,
struct nlattr *ptk_kek)
{
union wpa_event_data event;
const u8 *ssid;
u16 status_code;
if (drv->capa.flags & WPA_DRIVER_FLAGS_SME) {
@ -331,6 +332,16 @@ static void mlme_event_connect(struct wpa_driver_nl80211_data *drv,
if (req_ie) {
event.assoc_info.req_ies = nla_data(req_ie);
event.assoc_info.req_ies_len = nla_len(req_ie);
if (cmd == NL80211_CMD_ROAM) {
ssid = nl80211_get_ie(event.assoc_info.req_ies,
event.assoc_info.req_ies_len,
WLAN_EID_SSID);
if (ssid && ssid[1] > 0 && ssid[1] <= 32) {
drv->ssid_len = ssid[1];
os_memcpy(drv->ssid, ssid + 2, ssid[1]);
}
}
}
if (resp_ie) {
event.assoc_info.resp_ies = nla_data(resp_ie);

2
src/drivers/driver_nl80211_scan.c
View File

@ -433,7 +433,7 @@ int wpa_driver_nl80211_stop_sched_scan(void *priv)
}
static const u8 * nl80211_get_ie(const u8 *ies, size_t ies_len, u8 ie)
const u8 * nl80211_get_ie(const u8 *ies, size_t ies_len, u8 ie)
{
const u8 *end, *pos;

23
wpa_supplicant/events.c
View File

@ -158,11 +158,32 @@ static void wpa_supplicant_update_current_bss(struct wpa_supplicant *wpa_s)
static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s)
{
struct wpa_ssid *ssid, *old_ssid;
u8 drv_ssid[MAX_SSID_LEN];
size_t drv_ssid_len;
int res;
if (wpa_s->conf->ap_scan == 1 && wpa_s->current_ssid) {
wpa_supplicant_update_current_bss(wpa_s);
return 0;
if (wpa_s->current_ssid->ssid_len == 0)
return 0; /* current profile still in use */
res = wpa_drv_get_ssid(wpa_s, drv_ssid);
if (res < 0) {
wpa_msg(wpa_s, MSG_INFO,
"Failed to read SSID from driver");
return 0; /* try to use current profile */
}
drv_ssid_len = res;
if (drv_ssid_len == wpa_s->current_ssid->ssid_len &&
os_memcmp(drv_ssid, wpa_s->current_ssid->ssid,
drv_ssid_len) == 0)
return 0; /* current profile still in use */
wpa_msg(wpa_s, MSG_DEBUG,
"Driver-initiated BSS selection changed the SSID to %s",
wpa_ssid_txt(drv_ssid, drv_ssid_len));
/* continue selecting a new network profile */
}
wpa_dbg(wpa_s, MSG_DEBUG, "Select network based on association "