/**
* wpa_bss_update_end - End a BSS table update from scan results
* @wpa_s: Pointer to wpa_supplicant data
* @info: Information about scan parameters
* @new_scan: Whether this update round was based on a new scan
*
* This function is called at the end of each BSS table update round for new
* scan results. The start of the update was indicated with a call to
* wpa_bss_update_start().
*/
void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
int new_scan)
{
struct wpa_bss *bss, *n;
os_get_reltime(&wpa_s->last_scan);
if (!new_scan)
return; /* do not expire entries without new scan */
dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
if (wpa_bss_in_use(wpa_s, bss))
continue;
if (!wpa_bss_included_in_scan(bss, info))
continue; /* expire only BSSes that were scanned */
if (bss->last_update_idx < wpa_s->bss_update_idx)
bss->scan_miss_count++;
if (bss->scan_miss_count >=
wpa_s->conf->bss_expiration_scan_count) {
wpa_bss_remove(wpa_s, bss, "no match in scan");
}
}
wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u",
wpa_s->last_scan_res_used, wpa_s->last_scan_res_size);
}
static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
{
struct wpa_bss *bss;
dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
if (!wpa_bss_known(wpa_s, bss)) {
wpa_bss_remove(wpa_s, bss, __func__);
return 0;
}
}
return -1;
}
/**
* wpa_bss_flush - Flush all unused BSS entries
* @wpa_s: Pointer to wpa_supplicant data
*/
void wpa_bss_flush(struct wpa_supplicant *wpa_s)
{
struct wpa_bss *bss, *n;
wpa_s->clear_driver_scan_cache = 1;
if (wpa_s->bss.next == NULL)
return; /* BSS table not yet initialized */
dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
if (wpa_bss_in_use(wpa_s, bss))
continue;
wpa_bss_remove(wpa_s, bss, __func__);
}
}
/**
* wpa_bss_flush_by_age - Flush old BSS entries
* @wpa_s: Pointer to wpa_supplicant data
* @age: Maximum entry age in seconds
*
* Remove BSS entries that have not been updated during the last @age seconds.
*/
void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
{
struct wpa_bss *bss, *n;
struct os_reltime t;
if (dl_list_empty(&wpa_s->bss))
return;
os_get_reltime(&t);
t.sec -= age;
dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
if (wpa_bss_in_use(wpa_s, bss))
continue;
if (os_reltime_before(&bss->last_update, &t)) {
wpa_bss_remove(wpa_s, bss, __func__);
} else
break;
}
}
static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
{
struct wpa_bss *bss;
/*
* Remove the oldest entry that does not match with any configured
* network.
*/
if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
return 0;
/*
* Remove the oldest entry that isn't currently in use.
*/
dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
if (!wpa_bss_in_use(wpa_s, bss)) {
wpa_bss_remove(wpa_s, bss, __func__);
return 0;
}
}
return -1;
}