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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.
master
Jouni Malinen 15 years ago
parent 6fa81a3b3f
commit a1fd2ce54e
6 changed files with 71 additions and 39 deletions
Show Stats Download Patch File Download Diff File

2
wpa_supplicant/bss.h
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@ -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)

55
wpa_supplicant/events.c
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@ -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)))
if ((wpa_s->conf->ap_scan == 2 && !wpas_wps_searching(wpa_s))) {
wpa_scan_results_free(scan_res);
return;
}
if (wpa_s->disconnected) {
wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
wpa_scan_results_free(scan_res);
return;
}
if (bgscan_notify_scan(wpa_s) == 1)
if (bgscan_notify_scan(wpa_s) == 1) {
wpa_scan_results_free(scan_res);
return;
}
wpa_supplicant_rsn_preauth_scan_results(wpa_s, scan_res);
wpa_supplicant_rsn_preauth_scan_results(wpa_s);
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 {

40
wpa_supplicant/wpa_supplicant.c
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@ -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 scan_info *info, int new_scan)
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;
}

9
wpa_supplicant/wpa_supplicant_i.h
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@ -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 scan_info *info, int new_scan);
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
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@ -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
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@ -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;

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