int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
{
struct wpa_bss *bss;
struct wpa_ssid *ssid = wpa_s->current_ssid;
enum bss_trans_mgmt_status_code status = WNM_BSS_TM_REJECT_UNSPECIFIED;
enum mbo_transition_reject_reason reason =
MBO_TRANSITION_REJECT_REASON_UNSPECIFIED;
if (!wpa_s->wnm_neighbor_report_elements)
return 0;
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: Process scan results for BSS Transition Management");
if (os_reltime_before(&wpa_s->wnm_cand_valid_until,
&wpa_s->scan_trigger_time)) {
wpa_printf(MSG_DEBUG, "WNM: Previously stored BSS transition candidate list is not valid anymore - drop it");
wnm_deallocate_memory(wpa_s);
return 0;
}
if (!wpa_s->current_bss ||
os_memcmp(wpa_s->wnm_cand_from_bss, wpa_s->current_bss->bssid,
ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG, "WNM: Stored BSS transition candidate list not from the current BSS - ignore it");
return 0;
}
/* Compare the Neighbor Report and scan results */
bss = compare_scan_neighbor_results(wpa_s, 0, &reason);
if (!bss) {
wpa_printf(MSG_DEBUG, "WNM: No BSS transition candidate match found");
status = WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES;
goto send_bss_resp_fail;
}
/* Associate to the network */
wnm_bss_tm_connect(wpa_s, bss, ssid, 1);
return 1;
send_bss_resp_fail:
if (!reply_on_fail)
return 0;
/* Send reject response for all the failures */
if (wpa_s->wnm_reply) {
wpa_s->wnm_reply = 0;
wnm_send_bss_transition_mgmt_resp(wpa_s,
wpa_s->wnm_dialog_token,
status, reason, 0, NULL);
}
wnm_deallocate_memory(wpa_s);
return 0;
}
void wnm_scan_response(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res)
{
u8 bssid[ETH_ALEN];
if (scan_res == NULL) {
wpa_printf(MSG_ERROR, "Scan result is NULL");
goto send_bss_resp_fail;
}
/* Compare the Neighbor Report and scan results */
if (compare_scan_neighbor_results(wpa_s, scan_res,
wpa_s->wnm_neighbor_report_elements,
wpa_s->wnm_num_neighbor_report,
bssid) == 1) {
/* Associate to the network */
struct wpa_bss *bss;
struct wpa_ssid *ssid = wpa_s->current_ssid;
bss = wpa_bss_get_bssid(wpa_s, bssid);
if (!bss) {
wpa_printf(MSG_DEBUG, "WNM: Target AP not found from "
"BSS table");
goto send_bss_resp_fail;
}
/* Send the BSS Management Response - Accept */
if (wpa_s->wnm_reply) {
wnm_send_bss_transition_mgmt_resp(wpa_s,
wpa_s->wnm_dialog_token,
WNM_BSS_TM_ACCEPT,
0, bssid);
}
wpa_s->reassociate = 1;
wpa_supplicant_connect(wpa_s, bss, ssid);
wnm_deallocate_memory(wpa_s);
return;
}
/* Send reject response for all the failures */
send_bss_resp_fail:
wnm_deallocate_memory(wpa_s);
if (wpa_s->wnm_reply) {
wnm_send_bss_transition_mgmt_resp(wpa_s,
wpa_s->wnm_dialog_token,
WNM_BSS_TM_REJECT_UNSPECIFIED,
0, NULL);
}
return;
}
static int wnm_fetch_scan_results(struct wpa_supplicant *wpa_s)
{
struct wpa_scan_results *scan_res;
struct wpa_bss *bss;
struct wpa_ssid *ssid = wpa_s->current_ssid;
u8 i, found = 0;
size_t j;
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: Fetch current scan results from the driver for checking transition candidates");
scan_res = wpa_drv_get_scan_results2(wpa_s);
if (!scan_res) {
wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Failed to get scan results");
return 0;
}
if (scan_res->fetch_time.sec == 0)
os_get_reltime(&scan_res->fetch_time);
filter_scan_res(wpa_s, scan_res);
for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
struct neighbor_report *nei;
nei = &wpa_s->wnm_neighbor_report_elements[i];
if (nei->preference_present && nei->preference == 0)
continue;
for (j = 0; j < scan_res->num; j++) {
struct wpa_scan_res *res;
const u8 *ssid_ie;
res = scan_res->res[j];
if (os_memcmp(nei->bssid, res->bssid, ETH_ALEN) != 0 ||
res->age > WNM_SCAN_RESULT_AGE * 1000)
continue;
bss = wpa_s->current_bss;
ssid_ie = wpa_scan_get_ie(res, WLAN_EID_SSID);
if (bss && ssid_ie &&
(bss->ssid_len != ssid_ie[1] ||
os_memcmp(bss->ssid, ssid_ie + 2,
bss->ssid_len) != 0))
continue;
/* Potential candidate found */
found = 1;
scan_snr(res);
scan_est_throughput(wpa_s, res);
wpa_bss_update_scan_res(wpa_s, res,
&scan_res->fetch_time);
}
}
wpa_scan_results_free(scan_res);
if (!found) {
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: No transition candidate matches existing scan results");
return 0;
}
bss = compare_scan_neighbor_results(wpa_s, WNM_SCAN_RESULT_AGE, NULL);
if (!bss) {
wpa_dbg(wpa_s, MSG_DEBUG,
"WNM: Comparison of scan results against transition candidates did not find matches");
return 0;
}
/* Associate to the network */
wnm_bss_tm_connect(wpa_s, bss, ssid, 0);
return 1;
}
