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Do not store raw scan results

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Use scan results to update the BSS table and to select the BSS for
connection, but do not store the results for longer time.
This commit is contained in:
Jouni Malinen 2010-01-02 16:41:38 +02:00
parent 6fa81a3b3f
commit a1fd2ce54e
6 changed files with 75 additions and 43 deletions
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2
wpa_supplicant/bss.h
View file

@ -15,6 +15,8 @@
#ifndef BSS_H
#define BSS_H
struct wpa_scan_res;
#define WPA_BSS_QUAL_INVALID BIT(0)
#define WPA_BSS_NOISE_INVALID BIT(1)
#define WPA_BSS_LEVEL_INVALID BIT(2)

63
wpa_supplicant/events.c
View file

@ -392,6 +392,7 @@ static int wpa_supplicant_ssid_bss_match(struct wpa_supplicant *wpa_s,
static struct wpa_bss *
wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res,
struct wpa_ssid *group,
struct wpa_ssid **selected_ssid)
{
@ -402,10 +403,10 @@ wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s,
const u8 *ie;
wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP");
for (i = 0; i < wpa_s->scan_res->num; i++) {
for (i = 0; i < scan_res->num; i++) {
const u8 *ssid_;
u8 wpa_ie_len, rsn_ie_len, ssid_len;
bss = wpa_s->scan_res->res[i];
bss = scan_res->res[i];
ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
ssid_ = ie ? ie + 2 : (u8 *) "";
@ -487,6 +488,7 @@ wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s,
static struct wpa_bss *
wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res,
struct wpa_ssid *group,
struct wpa_ssid **selected_ssid)
{
@ -497,10 +499,10 @@ wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s,
const u8 *ie;
wpa_printf(MSG_DEBUG, "Try to find non-WPA AP");
for (i = 0; i < wpa_s->scan_res->num; i++) {
for (i = 0; i < scan_res->num; i++) {
const u8 *ssid_;
u8 wpa_ie_len, rsn_ie_len, ssid_len;
bss = wpa_s->scan_res->res[i];
bss = scan_res->res[i];
ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
ssid_ = ie ? ie + 2 : (u8 *) "";
@ -612,7 +614,9 @@ wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s,
static struct wpa_bss *
wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s, struct wpa_ssid *group,
wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res,
struct wpa_ssid *group,
struct wpa_ssid **selected_ssid)
{
struct wpa_bss *selected;
@ -621,18 +625,21 @@ wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s, struct wpa_ssid *group,
group->priority);
/* First, try to find WPA-enabled AP */
selected = wpa_supplicant_select_bss_wpa(wpa_s, group, selected_ssid);
selected = wpa_supplicant_select_bss_wpa(wpa_s, scan_res, group,
selected_ssid);
if (selected)
return selected;
/* If no WPA-enabled AP found, try to find non-WPA AP, if configuration
* allows this. */
return wpa_supplicant_select_bss_non_wpa(wpa_s, group, selected_ssid);
return wpa_supplicant_select_bss_non_wpa(wpa_s, scan_res, group,
selected_ssid);
}
static struct wpa_bss *
wpa_supplicant_pick_network(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *scan_res,
struct wpa_ssid **selected_ssid)
{
struct wpa_bss *selected = NULL;
@ -641,7 +648,7 @@ wpa_supplicant_pick_network(struct wpa_supplicant *wpa_s,
while (selected == NULL) {
for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
selected = wpa_supplicant_select_bss(
wpa_s, wpa_s->conf->pssid[prio],
wpa_s, scan_res, wpa_s->conf->pssid[prio],
selected_ssid);
if (selected)
break;
@ -736,19 +743,21 @@ wpa_supplicant_pick_new_network(struct wpa_supplicant *wpa_s)
}
/* TODO: move the rsn_preauth_scan_result*() to be called from notify.c based
* on BSS added and BSS changed events */
static void wpa_supplicant_rsn_preauth_scan_results(
struct wpa_supplicant *wpa_s)
struct wpa_supplicant *wpa_s, struct wpa_scan_results *scan_res)
{
int i;
if (rsn_preauth_scan_results(wpa_s->wpa) < 0)
return;
for (i = wpa_s->scan_res->num - 1; i >= 0; i--) {
for (i = scan_res->num - 1; i >= 0; i--) {
const u8 *ssid, *rsn;
struct wpa_scan_res *r;
r = wpa_s->scan_res->res[i];
r = scan_res->res[i];
ssid = wpa_scan_get_ie(r, WLAN_EID_SSID);
if (ssid == NULL)
@ -769,11 +778,14 @@ static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
{
struct wpa_bss *selected;
struct wpa_ssid *ssid = NULL;
struct wpa_scan_results *scan_res;
wpa_supplicant_notify_scanning(wpa_s, 0);
if (wpa_supplicant_get_scan_results(wpa_s, data ? &data->scan_info :
NULL, 1) < 0) {
scan_res = wpa_supplicant_get_scan_results(wpa_s,
data ? &data->scan_info :
NULL, 1);
if (scan_res == NULL) {
if (wpa_s->conf->ap_scan == 2)
return;
wpa_printf(MSG_DEBUG, "Failed to get scan results - try "
@ -787,7 +799,7 @@ static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
* and there were no results.
*/
if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1 &&
wpa_s->scan_res->num == 0) {
scan_res->num == 0) {
wpa_msg(wpa_s, MSG_DEBUG, "Cached scan results are "
"empty - not posting");
} else {
@ -798,20 +810,27 @@ static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
wpas_notify_scan_done(wpa_s, 1);
if ((wpa_s->conf->ap_scan == 2 && !wpas_wps_searching(wpa_s)))
return;
if (wpa_s->disconnected) {
wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
if ((wpa_s->conf->ap_scan == 2 && !wpas_wps_searching(wpa_s))) {
wpa_scan_results_free(scan_res);
return;
}
if (bgscan_notify_scan(wpa_s) == 1)
if (wpa_s->disconnected) {
wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
wpa_scan_results_free(scan_res);
return;
}
wpa_supplicant_rsn_preauth_scan_results(wpa_s);
if (bgscan_notify_scan(wpa_s) == 1) {
wpa_scan_results_free(scan_res);
return;
}
wpa_supplicant_rsn_preauth_scan_results(wpa_s, scan_res);
selected = wpa_supplicant_pick_network(wpa_s, scan_res, &ssid);
wpa_scan_results_free(scan_res);
selected = wpa_supplicant_pick_network(wpa_s, &ssid);
if (selected) {
wpa_supplicant_connect(wpa_s, selected, ssid);
} else {

38
wpa_supplicant/wpa_supplicant.c
View file

@ -400,8 +400,6 @@ static void wpa_supplicant_cleanup(struct wpa_supplicant *wpa_s)
wpa_s->wpa = NULL;
wpa_blacklist_clear(wpa_s);
wpa_scan_results_free(wpa_s->scan_res);
wpa_s->scan_res = NULL;
wpa_bss_deinit(wpa_s);
wpa_supplicant_cancel_scan(wpa_s);
@ -1569,33 +1567,47 @@ int wpa_supplicant_set_debug_params(struct wpa_global *global, int debug_level,
* @wpa_s: Pointer to wpa_supplicant data
* @info: Information about what was scanned or %NULL if not available
* @new_scan: Whether a new scan was performed
* Returns: 0 on success, -1 on failure
* Returns: Scan results, %NULL on failure
*
* This function request the current scan results from the driver and updates
* the local BSS list wpa_s->bss.
* the local BSS list wpa_s->bss. The caller is responsible for freeing the
* results with wpa_scan_results_free().
*/
int wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *
wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
struct scan_info *info, int new_scan)
{
struct wpa_scan_results *scan_res;
size_t i;
wpa_scan_results_free(wpa_s->scan_res);
if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)
wpa_s->scan_res = ieee80211_sta_get_scan_results(wpa_s);
scan_res = ieee80211_sta_get_scan_results(wpa_s);
else
wpa_s->scan_res = wpa_drv_get_scan_results2(wpa_s);
if (wpa_s->scan_res == NULL) {
scan_res = wpa_drv_get_scan_results2(wpa_s);
if (scan_res == NULL) {
wpa_printf(MSG_DEBUG, "Failed to get scan results");
return -1;
return NULL;
}
wpa_scan_sort_results(wpa_s->scan_res);
wpa_scan_sort_results(scan_res);
wpa_bss_update_start(wpa_s);
for (i = 0; i < wpa_s->scan_res->num; i++)
wpa_bss_update_scan_res(wpa_s, wpa_s->scan_res->res[i]);
for (i = 0; i < scan_res->num; i++)
wpa_bss_update_scan_res(wpa_s, scan_res->res[i]);
wpa_bss_update_end(wpa_s, info, new_scan);
return scan_res;
}
int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
{
struct wpa_scan_results *scan_res;
scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
if (scan_res == NULL)
return -1;
wpa_scan_results_free(scan_res);
return 0;
}

7
wpa_supplicant/wpa_supplicant_i.h
View file

@ -28,8 +28,6 @@ extern const char *wpa_supplicant_full_license4;
extern const char *wpa_supplicant_full_license5;
#endif /* CONFIG_NO_STDOUT_DEBUG */
struct wpa_scan_result;
struct wpa_scan_res;
struct wpa_sm;
struct wpa_supplicant;
struct ibss_rsn;
@ -345,7 +343,6 @@ struct wpa_supplicant {
*/
#define WILDCARD_SSID_SCAN ((struct wpa_ssid *) 1)
struct wpa_scan_results *scan_res;
struct dl_list bss; /* struct wpa_bss::list */
struct dl_list bss_id; /* struct wpa_bss::list_id */
size_t num_bss;
@ -446,8 +443,10 @@ void wpa_supplicant_associate(struct wpa_supplicant *wpa_s,
void wpa_supplicant_set_non_wpa_policy(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid);
void wpa_supplicant_initiate_eapol(struct wpa_supplicant *wpa_s);
int wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
struct wpa_scan_results *
wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
struct scan_info *info, int new_scan);
int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s);
void wpa_clear_keys(struct wpa_supplicant *wpa_s, const u8 *addr);
void wpa_supplicant_req_auth_timeout(struct wpa_supplicant *wpa_s,
int sec, int usec);

3
wpa_supplicant/wpas_glue.c
View file

@ -343,9 +343,8 @@ static int wpa_supplicant_get_beacon_ie(void *ctx)
/* No WPA/RSN IE found in the cached scan results. Try to get updated
* scan results from the driver. */
if (wpa_supplicant_get_scan_results(wpa_s, NULL, 0) < 0) {
if (wpa_supplicant_update_scan_results(wpa_s) < 0)
return -1;
}
return wpa_get_beacon_ie(wpa_s);
}

1
wpa_supplicant/wps_supplicant.h
View file

@ -21,6 +21,7 @@
#include "wps/wps_defs.h"
struct wpa_bss;
struct wpa_scan_res;
struct wps_new_ap_settings {
const char *ssid_hex;