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Add a scan result cache to improve roaming speed if the driver gave us a background scan before losing the connection.
--- a/wpa_supplicant/config.h
+++ b/wpa_supplicant/config.h
@@ -97,6 +97,12 @@
int ap_scan;
/**
+ * scan_cache - controls the time in seconds after the last scan results
+ * before a new scan may be initiated
+ */
+ int scan_cache;
+
+ /**
* ctrl_interface - Parameters for the control interface
*
* If this is specified, %wpa_supplicant will open a control interface
--- a/wpa_supplicant/config_file.c
+++ b/wpa_supplicant/config_file.c
@@ -312,6 +312,13 @@
return 0;
}
+static int wpa_config_process_scan_cache(struct wpa_config *config, char *pos)
+{
+ config->scan_cache = atoi(pos);
+ wpa_printf(MSG_DEBUG, "scan_cache=%d", config->scan_cache);
+ return 0;
+}
+
static int wpa_config_process_fast_reauth(struct wpa_config *config, char *pos)
{
@@ -445,6 +452,9 @@
if (os_strncmp(pos, "ap_scan=", 8) == 0)
return wpa_config_process_ap_scan(config, pos + 8);
+ if (os_strncmp(pos, "scan_cache=", 11) == 0)
+ return wpa_config_process_scan_cache(config, pos + 11);
+
if (os_strncmp(pos, "fast_reauth=", 12) == 0)
return wpa_config_process_fast_reauth(config, pos + 12);
@@ -810,6 +820,8 @@
fprintf(f, "eapol_version=%d\n", config->eapol_version);
if (config->ap_scan != DEFAULT_AP_SCAN)
fprintf(f, "ap_scan=%d\n", config->ap_scan);
+ if (config->scan_cache != 0)
+ fprintf(f, "scan_cache=%d\n", config->scan_cache);
if (config->fast_reauth != DEFAULT_FAST_REAUTH)
fprintf(f, "fast_reauth=%d\n", config->fast_reauth);
#ifdef EAP_TLS_OPENSSL
--- a/wpa_supplicant/events.c
+++ b/wpa_supplicant/events.c
@@ -555,6 +555,9 @@
if (wpa_s->conf->ap_scan == 2 || wpa_s->disconnected)
return;
+ if (wpa_s->wpa_state > WPA_ASSOCIATED)
+ goto done;
+
while (selected == NULL) {
for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
selected = wpa_supplicant_select_bss(
@@ -567,6 +570,7 @@
wpa_printf(MSG_DEBUG, "No APs found - clear blacklist "
"and try again");
wpa_blacklist_clear(wpa_s);
+ memset(&wpa_s->last_scan_results, 0, sizeof(wpa_s->last_scan_results));
} else if (selected == NULL) {
break;
}
@@ -594,10 +598,12 @@
rsn_preauth_scan_results(wpa_s->wpa, wpa_s->scan_res);
} else {
wpa_printf(MSG_DEBUG, "No suitable AP found.");
- timeout = 5;
+ timeout = 0;
goto req_scan;
}
+done:
+ os_get_time(&wpa_s->last_scan_results);
return;
req_scan:
@@ -804,6 +810,9 @@
}
if (wpa_s->wpa_state >= WPA_ASSOCIATED)
wpa_supplicant_req_scan(wpa_s, 0, 100000);
+ else if (wpa_s->wpa_state == WPA_ASSOCIATING)
+ wpa_supplicant_req_auth_timeout(wpa_s, 0, 100000);
+
bssid = wpa_s->bssid;
if (os_memcmp(bssid, "\x00\x00\x00\x00\x00\x00", ETH_ALEN) == 0)
bssid = wpa_s->pending_bssid;
--- a/wpa_supplicant/wpa_supplicant_i.h
+++ b/wpa_supplicant/wpa_supplicant_i.h
@@ -334,6 +334,7 @@
struct wpa_client_mlme mlme;
int use_client_mlme;
int driver_4way_handshake;
+ struct os_time last_scan_results;
};
@@ -381,6 +382,7 @@
/* scan.c */
void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec);
+int wpa_supplicant_may_scan(struct wpa_supplicant *wpa_s);
void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s);
/* events.c */
--- a/wpa_supplicant/scan.c
+++ b/wpa_supplicant/scan.c
@@ -40,6 +40,18 @@
wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
}
+int wpa_supplicant_may_scan(struct wpa_supplicant *wpa_s)
+{
+ struct os_time time;
+
+ if (wpa_s->conf->scan_cache > 0) {
+ os_get_time(&time);
+ time.sec -= wpa_s->conf->scan_cache;
+ if (os_time_before(&time, &wpa_s->last_scan_results))
+ return 0;
+ }
+ return 1;
+}
static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
{
@@ -150,8 +162,9 @@
} else
wpa_s->prev_scan_ssid = BROADCAST_SSID_SCAN;
- if (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
- !wpa_s->use_client_mlme) {
+ if (!wpa_supplicant_may_scan(wpa_s) ||
+ (wpa_s->scan_res_tried == 0 && wpa_s->conf->ap_scan == 1 &&
+ !wpa_s->use_client_mlme)) {
wpa_s->scan_res_tried++;
wpa_printf(MSG_DEBUG, "Trying to get current scan results "
"first without requesting a new scan to speed up "
--- a/wpa_supplicant/wpa_supplicant.c
+++ b/wpa_supplicant/wpa_supplicant.c
@@ -1417,6 +1417,9 @@
{
struct wpa_supplicant *wpa_s = ctx;
+ if (wpa_s->wpa_state < WPA_ASSOCIATING)
+ return;
+
wpa_printf(MSG_DEBUG, "RX EAPOL from " MACSTR, MAC2STR(src_addr));
wpa_hexdump(MSG_MSGDUMP, "RX EAPOL", buf, len);
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