/**
* rsn_preauth_scan_results - Process scan results to find PMKSA candidates
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @results: Scan results
*
* This functions goes through the scan results and adds all suitable APs
* (Authenticators) into PMKSA candidate list.
*/
void rsn_preauth_scan_results(struct wpa_sm *sm,
struct wpa_scan_results *results)
{
struct wpa_scan_res *r;
struct wpa_ie_data ie;
int i;
struct rsn_pmksa_cache_entry *pmksa;
if (sm->ssid_len == 0)
return;
/*
* TODO: is it ok to free all candidates? What about the entries
* received from EVENT_PMKID_CANDIDATE?
*/
pmksa_candidate_free(sm);
for (i = results->num - 1; i >= 0; i--) {
const u8 *ssid, *rsn;
r = results->res[i];
ssid = wpa_scan_get_ie(r, WLAN_EID_SSID);
if (ssid == NULL || ssid[1] != sm->ssid_len ||
os_memcmp(ssid + 2, sm->ssid, ssid[1]) != 0)
continue;
if (os_memcmp(r->bssid, sm->bssid, ETH_ALEN) == 0)
continue;
rsn = wpa_scan_get_ie(r, WLAN_EID_RSN);
if (rsn == NULL || wpa_parse_wpa_ie(rsn, 2 + rsn[1], &ie))
continue;
pmksa = pmksa_cache_get(sm->pmksa, r->bssid, NULL);
if (pmksa &&
(!pmksa->opportunistic ||
!(ie.capabilities & WPA_CAPABILITY_PREAUTH)))
continue;
/*
* Give less priority to candidates found from normal
* scan results.
*/
pmksa_candidate_add(sm, r->bssid,
PMKID_CANDIDATE_PRIO_SCAN,
ie.capabilities & WPA_CAPABILITY_PREAUTH);
}
}
static void wpa_supplicant_event_pmkid_candidate(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
if (data == NULL) {
wpa_printf(MSG_DEBUG, "RSN: No data in PMKID candidate event");
return;
}
wpa_printf(MSG_DEBUG, "RSN: PMKID candidate event - bssid=" MACSTR
" index=%d preauth=%d",
MAC2STR(data->pmkid_candidate.bssid),
data->pmkid_candidate.index,
data->pmkid_candidate.preauth);
pmksa_candidate_add(wpa_s->wpa, data->pmkid_candidate.bssid,
data->pmkid_candidate.index,
data->pmkid_candidate.preauth);
}
/**
* rsn_preauth_scan_results - Process scan results to find PMKSA candidates
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @results: Scan results
* @count: Number of BSSes in scan results
*
* This functions goes through the scan results and adds all suitable APs
* (Authenticators) into PMKSA candidate list.
*/
void rsn_preauth_scan_results(struct wpa_sm *sm,
struct wpa_scan_result *results, int count)
{
struct wpa_scan_result *r;
struct wpa_ie_data ie;
int i;
struct rsn_pmksa_cache *pmksa;
if (sm->cur_ssid == NULL)
return;
/*
* TODO: is it ok to free all candidates? What about the entries
* received from EVENT_PMKID_CANDIDATE?
*/
pmksa_candidate_free(sm);
for (i = count - 1; i >= 0; i--) {
r = &results[i];
if (r->ssid_len != sm->cur_ssid->ssid_len ||
memcmp(r->ssid, sm->cur_ssid->ssid,
r->ssid_len) != 0)
continue;
if (memcmp(r->bssid, sm->bssid, ETH_ALEN) == 0)
continue;
if (r->rsn_ie_len == 0 ||
wpa_parse_wpa_ie(r->rsn_ie, r->rsn_ie_len, &ie))
continue;
pmksa = pmksa_cache_get(sm, r->bssid, NULL);
if (pmksa &&
(!pmksa->opportunistic ||
!(ie.capabilities & WPA_CAPABILITY_PREAUTH)))
continue;
/*
* Give less priority to candidates found from normal
* scan results.
*/
pmksa_candidate_add(sm, r->bssid,
PMKID_CANDIDATE_PRIO_SCAN,
ie.capabilities & WPA_CAPABILITY_PREAUTH);
}
}
/* TODO: schedule periodic scans if current AP supports preauth */
void rsn_preauth_scan_results(struct wpa_supplicant *wpa_s,
struct wpa_scan_result *results, int count)
{
struct wpa_scan_result *r;
struct wpa_ie_data ie;
int i;
struct rsn_pmksa_cache *pmksa;
if (wpa_s->current_ssid == NULL)
return;
pmksa_candidate_free(wpa_s);
for (i = count - 1; i >= 0; i--) {
r = &results[i];
if (r->ssid_len != wpa_s->current_ssid->ssid_len ||
memcmp(r->ssid, wpa_s->current_ssid->ssid,
r->ssid_len) != 0)
continue;
if (memcmp(r->bssid, wpa_s->bssid, ETH_ALEN) == 0)
continue;
if (r->rsn_ie_len == 0 ||
wpa_parse_wpa_ie(wpa_s, r->rsn_ie, r->rsn_ie_len, &ie))
continue;
pmksa = pmksa_cache_get(wpa_s, r->bssid, NULL);
if (pmksa &&
(!pmksa->opportunistic ||
!(ie.capabilities & WPA_CAPABILITY_PREAUTH)))
continue;
/*
* Give less priority to candidates found from normal
* scan results.
*/
pmksa_candidate_add(wpa_s, r->bssid,
PMKID_CANDIDATE_PRIO_SCAN,
ie.capabilities & WPA_CAPABILITY_PREAUTH);
}
}