File wpa_supplicant-roaming.patch of Package wpa_supplicant
diff -ur wpa_supplicant-0.6.4/src/drivers/driver.h wpa_supplicant-0.6.4_us/src/drivers/driver.h
--- wpa_supplicant-0.6.4/src/drivers/driver.h 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_us/src/drivers/driver.h 2008-10-13 13:50:55.000000000 +0200
@@ -929,6 +929,8 @@
* Returns: 0 on success, -1 on failure
*/
int (*set_mode)(void *priv, int mode);
+
+ int (*get_default_roaming)(void *priv);
};
/**
@@ -1052,7 +1054,13 @@
* FT authentication sequence from the AP. The FT IEs are included in
* the extra information in union wpa_event_data::ft_ies.
*/
- EVENT_FT_RESPONSE
+ EVENT_FT_RESPONSE,
+
+ /**
+ * EVENT_ROAMING_THRESHOLD - Roaming threshold exceeded
+ */
+ EVENT_ROAMING_THRESHOLD
+
} wpa_event_type;
diff -ur wpa_supplicant-0.6.4/src/drivers/driver_wext.c wpa_supplicant-0.6.4_us/src/drivers/driver_wext.c
--- wpa_supplicant-0.6.4/src/drivers/driver_wext.c 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_us/src/drivers/driver_wext.c 2008-10-13 14:54:03.000000000 +0200
@@ -643,10 +642,18 @@
drv->assoc_req_ies = NULL;
os_free(drv->assoc_resp_ies);
drv->assoc_resp_ies = NULL;
+
+ /* stop monitoring the signal quality */
+ eloop_cancel_timeout(wpa_driver_wext_monitor_quality, drv, drv->ctx);
+
wpa_supplicant_event(ctx, EVENT_DISASSOC,
NULL);
} else {
+ /* start monitoring the signal quality */
+ eloop_register_timeout(5, 0, wpa_driver_wext_monitor_quality, drv,
+ drv->ctx);
+
wpa_driver_wext_event_assoc_ies(drv);
wpa_supplicant_event(ctx, EVENT_ASSOC, NULL);
}
@@ -1027,6 +1034,30 @@
return wpa_driver_wext_set_ifflags_ifname(drv, drv->ifname, flags);
}
+void wpa_driver_wext_set_default_roaming(struct wpa_driver_wext_data *drv)
+{
+ /* ugly hack to enable roaming only for the iwlwifi driver */
+ char buf[256];
+ char line[256];
+ FILE* f;
+
+ /* the driver we want roaming enabled for */
+ char* driver = "DRIVER=iwlagn";
+
+ /* lookup this interface in sysfs */
+ snprintf(buf, sizeof(buf),"/sys/class/net/%s/device/uevent", drv->ifname);
+ if ( (f = fopen(buf, "r")) ) {
+ while (fgets(line, sizeof(line), f)) {
+ if (strstr (line, driver)) {
+ /* iwlwifi found -> enable roaming */
+ drv->default_roaming = 1;
+ break;
+ }
+ }
+ fclose(f);
+ f = NULL;
+ }
+}
/**
* wpa_driver_wext_init - Initialize WE driver interface
@@ -1078,6 +1109,9 @@
drv->mlme_sock = -1;
+ drv->default_roaming = 0;
+ wpa_driver_wext_set_default_roaming(drv);
+
wpa_driver_wext_finish_drv_init(drv);
return drv;
@@ -1153,6 +1187,7 @@
int flags;
eloop_cancel_timeout(wpa_driver_wext_scan_timeout, drv, drv->ctx);
+ eloop_cancel_timeout(wpa_driver_wext_monitor_quality, drv, drv->ctx);
/*
* Clear possibly configured driver parameters in order to make it
@@ -1206,6 +1241,69 @@
wpa_supplicant_event(timeout_ctx, EVENT_SCAN_RESULTS, NULL);
}
+/**
+ * wpa_driver_wext_monitor_quality - Monitor the signal quality
+ * @eloop_ctx: Unused
+ * @timeout_ctx: ctx argument given to wpa_driver_wext_init()
+ */
+void wpa_driver_wext_monitor_quality(void *eloop_ctx, void *timeout_ctx)
+{
+ struct iwreq iwr;
+ struct iw_statistics stats;
+ struct wpa_driver_wext_data *drv = (struct wpa_driver_wext_data *) eloop_ctx;
+ int timeout_sec;
+
+ os_memset(&iwr, 0, sizeof(iwr));
+ os_memset(&stats, 0, sizeof(stats));
+
+ os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
+
+ iwr.u.data.pointer = (caddr_t) &stats;
+ iwr.u.data.length = sizeof(stats);
+ iwr.u.data.flags = 1;
+
+ if (ioctl(drv->ioctl_sock, SIOCGIWSTATS, &iwr) < 0) {
+ perror("ioctl[SIOCGIWSTATS]");
+ return;
+ }
+
+ if (stats.qual.qual < (int) (0.4f * (float)drv->max_qual))
+ {
+ if (++drv->low_signal_count >= 3)
+ {
+ wpa_printf(MSG_DEBUG, "Signal quality low (%i/%i)", stats.qual.qual, drv->max_qual);
+ drv->low_signal_count = 0;
+ wpa_supplicant_event(drv->ctx, EVENT_ROAMING_THRESHOLD, NULL);
+ /* next measurement in 5 seconds */
+ eloop_register_timeout(5, 0, wpa_driver_wext_monitor_quality, drv, drv->ctx);
+ }
+ else
+ {
+ /* next measurment in 100ms */
+ eloop_register_timeout(0, 100000, wpa_driver_wext_monitor_quality, drv, drv->ctx);
+ }
+ return;
+ }
+ drv->low_signal_count = 0;
+
+ if (stats.qual.qual < (int) (0.6f * (float)drv->max_qual))
+ timeout_sec = 2;
+ else if (stats.qual.qual < (int) (0.8f * (float)drv->max_qual))
+ timeout_sec = 5;
+ else
+ timeout_sec = 10;
+
+ eloop_register_timeout(timeout_sec, 0, wpa_driver_wext_monitor_quality, drv, drv->ctx);
+}
+
+/**
+ * wpa_driver_get_default_roaming - Enable/Disable roaming per default
+ */
+int wpa_driver_get_default_roaming(void *priv)
+{
+ struct wpa_driver_wext_data *drv = priv;
+ return drv->default_roaming;
+}
/**
* wpa_driver_wext_scan - Request the driver to initiate scan
@@ -1753,6 +1850,7 @@
if (range->enc_capa & IW_ENC_CAPA_4WAY_HANDSHAKE)
drv->capa.flags |= WPA_DRIVER_FLAGS_4WAY_HANDSHAKE;
+ drv->max_qual = range->max_qual.qual;
wpa_printf(MSG_DEBUG, " capabilities: key_mgmt 0x%x enc 0x%x "
"flags 0x%x",
drv->capa.key_mgmt, drv->capa.enc, drv->capa.flags);
@@ -2766,6 +2865,7 @@
.flush_pmkid = wpa_driver_wext_flush_pmkid,
.get_capa = wpa_driver_wext_get_capa,
.set_operstate = wpa_driver_wext_set_operstate,
+ .get_default_roaming = wpa_driver_get_default_roaming,
#ifdef CONFIG_CLIENT_MLME
.get_hw_feature_data = wpa_driver_wext_get_hw_feature_data,
.set_channel = wpa_driver_wext_set_channel,
diff -ur wpa_supplicant-0.6.4/src/drivers/driver_wext.h wpa_supplicant-0.6.4_us/src/drivers/driver_wext.h
--- wpa_supplicant-0.6.4/src/drivers/driver_wext.h 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_us/src/drivers/driver_wext.h 2008-10-13 14:08:22.000000000 +0200
@@ -43,6 +43,9 @@
char mlmedev[IFNAMSIZ + 1];
int scan_complete_events;
+ int low_signal_count;
+ int max_qual;
+ int default_roaming;
};
int wpa_driver_wext_get_ifflags(struct wpa_driver_wext_data *drv, int *flags);
@@ -61,6 +64,7 @@
struct wpa_scan_results * wpa_driver_wext_get_scan_results(void *priv);
void wpa_driver_wext_scan_timeout(void *eloop_ctx, void *timeout_ctx);
+void wpa_driver_wext_monitor_quality(void *eloop_ctx, void *timeout_ctx);
int wpa_driver_wext_alternative_ifindex(struct wpa_driver_wext_data *drv,
const char *ifname);
diff -ur wpa_supplicant-0.6.4/wpa_supplicant/config.c wpa_supplicant-0.6.4_us/wpa_supplicant/config.c
--- wpa_supplicant-0.6.4/wpa_supplicant/config.c 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_us/wpa_supplicant/config.c 2008-09-29 13:13:31.000000000 +0200
@@ -1883,6 +1883,7 @@
config->eapol_version = DEFAULT_EAPOL_VERSION;
config->ap_scan = DEFAULT_AP_SCAN;
config->fast_reauth = DEFAULT_FAST_REAUTH;
+ config->roaming = DEFAULT_ROAMING;
if (ctrl_interface)
config->ctrl_interface = os_strdup(ctrl_interface);
diff -ur wpa_supplicant-0.6.4/wpa_supplicant/config_file.c wpa_supplicant-0.6.4_us/wpa_supplicant/config_file.c
--- wpa_supplicant-0.6.4/wpa_supplicant/config_file.c 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_us/wpa_supplicant/config_file.c 2008-09-29 13:20:10.000000000 +0200
@@ -312,6 +312,12 @@
return 0;
}
+static int wpa_config_process_roaming(struct wpa_config *config, char *pos)
+{
+ config->roaming = atoi(pos);
+ wpa_printf(MSG_DEBUG, "roaming=%d", config->roaming);
+ return 0;
+}
static int wpa_config_process_fast_reauth(struct wpa_config *config, char *pos)
{
@@ -445,6 +451,9 @@
if (os_strncmp(pos, "ap_scan=", 8) == 0)
return wpa_config_process_ap_scan(config, pos + 8);
+ if (os_strncmp(pos, "roaming=", 8) == 0)
+ return wpa_config_process_roaming(config, pos + 8);
+
if (os_strncmp(pos, "fast_reauth=", 12) == 0)
return wpa_config_process_fast_reauth(config, pos + 12);
diff -ur wpa_supplicant-0.6.4/wpa_supplicant/config.h wpa_supplicant-0.6.4_us/wpa_supplicant/config.h
--- wpa_supplicant-0.6.4/wpa_supplicant/config.h 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_us/wpa_supplicant/config.h 2008-10-13 13:42:01.000000000 +0200
@@ -22,6 +22,7 @@
#define DEFAULT_AP_SCAN 1
#endif /* CONFIG_NO_SCAN_PROCESSING */
#define DEFAULT_FAST_REAUTH 1
+#define DEFAULT_ROAMING -1
#include "config_ssid.h"
@@ -244,6 +245,11 @@
int update_config;
/**
+ * roaming
+ */
+ int roaming;
+
+ /**
* blobs - Configuration blobs
*/
struct wpa_config_blob *blobs;
diff -ur wpa_supplicant-0.6.4/wpa_supplicant/events.c wpa_supplicant-0.6.4_us/wpa_supplicant/events.c
--- wpa_supplicant-0.6.4/wpa_supplicant/events.c 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_us/wpa_supplicant/events.c 2008-10-13 13:53:52.000000000 +0200
@@ -613,6 +613,21 @@
}
#endif /* CONFIG_NO_SCAN_PROCESSING */
+static void wpa_supplicant_event_roaming_threshold(struct wpa_supplicant *wpa_s)
+{
+ struct os_time t1, t2;
+ os_get_time(&t1);
+ os_time_sub(&t1, &(wpa_s->last_roaming_attempt), &t2);
+ if (wpa_s->conf->roaming > 0
+ || (wpa_s->conf->roaming == -1
+ && wpa_s->driver->get_default_roaming
+ && wpa_s->driver->get_default_roaming(wpa_s->drv_priv)))
+ /* limit the scan triggering to one every 20 seconds */
+ if (t2.sec > 20) {
+ wpa_supplicant_req_scan(wpa_s, 0, 0);
+ os_get_time(&(wpa_s->last_roaming_attempt));
+ }
+}
static void wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
@@ -955,6 +970,9 @@
wpa_supplicant_event_ft_response(wpa_s, data);
break;
#endif /* CONFIG_IEEE80211R */
+ case EVENT_ROAMING_THRESHOLD:
+ wpa_supplicant_event_roaming_threshold(wpa_s);
+ break;
default:
wpa_printf(MSG_INFO, "Unknown event %d", event);
break;
diff -ur wpa_supplicant-0.6.4/wpa_supplicant/wpa_supplicant_i.h wpa_supplicant-0.6.4_us/wpa_supplicant/wpa_supplicant_i.h
--- wpa_supplicant-0.6.4/wpa_supplicant/wpa_supplicant_i.h 2008-08-10 19:33:12.000000000 +0200
+++ wpa_supplicant-0.6.4_us/wpa_supplicant/wpa_supplicant_i.h 2008-10-13 13:53:43.000000000 +0200
@@ -334,6 +334,7 @@
struct wpa_client_mlme mlme;
int use_client_mlme;
int driver_4way_handshake;
+ struct os_time last_roaming_attempt;
};
