static struct wpa_bss *
wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res,
struct wpa_ssid *group,
struct wpa_ssid **selected_ssid)
{
size_t i;
wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d",
group->priority);
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *bss = scan_res->res[i];
const u8 *ie, *ssid;
u8 ssid_len;
*selected_ssid = wpa_scan_res_match(wpa_s, i, bss, group);
if (!*selected_ssid)
continue;
ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
ssid = ie ? ie + 2 : (u8 *) "";
ssid_len = ie ? ie[1] : 0;
wpa_printf(MSG_DEBUG, " selected BSS " MACSTR " ssid='%s'",
MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
return wpa_bss_get(wpa_s, bss->bssid, ssid, ssid_len);
}
return NULL;
}
static int wnm_add_cand_list(struct wpa_supplicant *wpa_s, u8 *buf, size_t len)
{
u8 *pos = buf;
unsigned int i, pref = 255;
struct os_reltime now;
struct wpa_ssid *ssid = wpa_s->current_ssid;
if (!ssid)
return 0;
/*
* TODO: Define when scan results are no longer valid for the candidate
* list.
*/
os_get_reltime(&now);
if (os_reltime_expired(&now, &wpa_s->last_scan, 10))
return 0;
wpa_printf(MSG_DEBUG,
"WNM: Add candidate list to BSS Transition Management Response frame");
for (i = 0; i < wpa_s->last_scan_res_used && pref; i++) {
struct wpa_bss *bss = wpa_s->last_scan_res[i];
int res;
if (wpa_scan_res_match(wpa_s, i, bss, ssid, 1, 0)) {
res = wnm_nei_rep_add_bss(wpa_s, bss, pos, len, pref--);
if (res == -2)
continue; /* could not build entry for BSS */
if (res < 0)
break; /* no more room for candidates */
if (pref == 1)
break;
pos += res;
len -= res;
}
}
wpa_hexdump(MSG_DEBUG,
"WNM: BSS Transition Management Response candidate list",
buf, pos - buf);
return pos - buf;
}
static struct wpa_bss *
compare_scan_neighbor_results(struct wpa_supplicant *wpa_s, os_time_t age_secs,
enum mbo_transition_reject_reason *reason)
{
u8 i;
struct wpa_bss *bss = wpa_s->current_bss;
struct wpa_bss *target;
if (!bss)
return NULL;
wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
MAC2STR(wpa_s->bssid), bss->level);
wnm_clear_acceptable(wpa_s);
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) {
wpa_printf(MSG_DEBUG, "Skip excluded BSS " MACSTR,
MAC2STR(nei->bssid));
continue;
}
target = wpa_bss_get_bssid(wpa_s, nei->bssid);
if (!target) {
wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
" (pref %d) not found in scan results",
MAC2STR(nei->bssid),
nei->preference_present ? nei->preference :
-1);
continue;
}
if (age_secs) {
struct os_reltime now;
if (os_get_reltime(&now) == 0 &&
os_reltime_expired(&now, &target->last_update,
age_secs)) {
wpa_printf(MSG_DEBUG,
"Candidate BSS is more than %ld seconds old",
age_secs);
continue;
}
}
if (bss->ssid_len != target->ssid_len ||
os_memcmp(bss->ssid, target->ssid, bss->ssid_len) != 0) {
/*
* TODO: Could consider allowing transition to another
* ESS if PMF was enabled for the association.
*/
wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
" (pref %d) in different ESS",
MAC2STR(nei->bssid),
nei->preference_present ? nei->preference :
-1);
continue;
}
if (wpa_s->current_ssid &&
!wpa_scan_res_match(wpa_s, 0, target, wpa_s->current_ssid,
1, 0)) {
wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
" (pref %d) does not match the current network profile",
MAC2STR(nei->bssid),
nei->preference_present ? nei->preference :
-1);
continue;
}
if (wpa_is_bss_tmp_disallowed(wpa_s, target->bssid)) {
wpa_printf(MSG_DEBUG,
"MBO: Candidate BSS " MACSTR
" retry delay is not over yet",
MAC2STR(nei->bssid));
continue;
}
if (target->level < bss->level && target->level < -80) {
wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
" (pref %d) does not have sufficient signal level (%d)",
MAC2STR(nei->bssid),
nei->preference_present ? nei->preference :
-1,
target->level);
continue;
}
nei->acceptable = 1;
}
#ifdef CONFIG_MBO
if (wpa_s->wnm_mbo_trans_reason_present)
target = get_mbo_transition_candidate(wpa_s, reason);
else
target = get_first_acceptable(wpa_s);
#else /* CONFIG_MBO */
target = get_first_acceptable(wpa_s);
#endif /* CONFIG_MBO */
if (target) {
wpa_printf(MSG_DEBUG,
"WNM: Found an acceptable preferred transition candidate BSS "
MACSTR " (RSSI %d)",
MAC2STR(target->bssid), target->level);
}
return target;
}
