struct dl_list list;
u8 bssid[ETH_ALEN];
int freq;
+ u8 *neigh; /* num_neigh * ETH_ALEN buffer */
+ size_t num_neigh;
};
struct bgscan_learn_data {
};
+static void bss_free(struct bgscan_learn_bss *bss)
+{
+ os_free(bss->neigh);
+ os_free(bss);
+}
+
+
+static int bssid_in_array(u8 *array, size_t array_len, const u8 *bssid)
+{
+ size_t i;
+
+ if (array == NULL || array_len == 0)
+ return 0;
+
+ for (i = 0; i < array_len; i++) {
+ if (os_memcmp(array + i * ETH_ALEN, bssid, ETH_ALEN) == 0)
+ return 1;
+ }
+
+ return 0;
+}
+
+
+static void bgscan_learn_add_neighbor(struct bgscan_learn_bss *bss,
+ const u8 *bssid)
+{
+ u8 *n;
+
+ if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
+ return;
+ if (bssid_in_array(bss->neigh, bss->num_neigh, bssid))
+ return;
+
+ n = os_realloc(bss->neigh, (bss->num_neigh + 1) * ETH_ALEN);
+ if (n == NULL)
+ return;
+
+ os_memcpy(n + bss->num_neigh * ETH_ALEN, bssid, ETH_ALEN);
+ bss->neigh = n;
+ bss->num_neigh++;
+}
+
+
static struct bgscan_learn_bss * bgscan_learn_get_bss(
struct bgscan_learn_data *data, const u8 *bssid)
{
{
FILE *f;
char buf[128];
+ struct bgscan_learn_bss *bss;
if (data->fname == NULL)
return 0;
while (fgets(buf, sizeof(buf), f)) {
if (os_strncmp(buf, "BSS ", 4) == 0) {
- struct bgscan_learn_bss *bss;
bss = os_zalloc(sizeof(*bss));
if (!bss)
continue;
if (hwaddr_aton(buf + 4, bss->bssid) < 0) {
- os_free(bss);
+ bss_free(bss);
continue;
}
bss->freq = atoi(buf + 4 + 18);
"entry: " MACSTR " freq=%d",
MAC2STR(bss->bssid), bss->freq);
}
+
+ if (os_strncmp(buf, "NEIGHBOR ", 9) == 0) {
+ u8 addr[ETH_ALEN];
+
+ if (hwaddr_aton(buf + 9, addr) < 0)
+ continue;
+ bss = bgscan_learn_get_bss(data, addr);
+ if (bss == NULL)
+ continue;
+ if (hwaddr_aton(buf + 9 + 18, addr) < 0)
+ continue;
+
+ bgscan_learn_add_neighbor(bss, addr);
+ }
}
fclose(f);
MAC2STR(bss->bssid), bss->freq);
}
+ dl_list_for_each(bss, &data->bss, struct bgscan_learn_bss, list) {
+ size_t i;
+ for (i = 0; i < bss->num_neigh; i++) {
+ fprintf(f, "NEIGHBOR " MACSTR " " MACSTR "\n",
+ MAC2STR(bss->bssid),
+ MAC2STR(bss->neigh + i * ETH_ALEN));
+ }
+ }
+
fclose(f);
}
data->scan_interval = data->short_interval;
eloop_register_timeout(data->scan_interval, 0, bgscan_learn_timeout,
data, NULL);
+
+ /*
+ * This function is called immediately after an association, so it is
+ * reasonable to assume that a scan was completed recently. This makes
+ * us skip an immediate new scan in cases where the current signal
+ * level is below the bgscan threshold.
+ */
+ os_get_time(&data->last_bgscan);
+
return data;
}
dl_list_for_each_safe(bss, n, &data->bss, struct bgscan_learn_bss,
list) {
dl_list_del(&bss->list);
- os_free(bss);
+ bss_free(bss);
}
os_free(data->supp_freqs);
os_free(data);
struct wpa_scan_results *scan_res)
{
struct bgscan_learn_data *data = priv;
- size_t i;
+ size_t i, j;
+#define MAX_BSS 50
+ u8 bssid[MAX_BSS * ETH_ALEN];
+ size_t num_bssid = 0;
wpa_printf(MSG_DEBUG, "bgscan learn: scan result notification");
for (i = 0; i < scan_res->num; i++) {
struct wpa_scan_res *res = scan_res->res[i];
+ if (!bgscan_learn_bss_match(data, res))
+ continue;
+
+ if (num_bssid < MAX_BSS) {
+ os_memcpy(bssid + num_bssid * ETH_ALEN, res->bssid,
+ ETH_ALEN);
+ num_bssid++;
+ }
+ }
+ wpa_printf(MSG_DEBUG, "bgscan learn: %u matching BSSes in scan "
+ "results", (unsigned int) num_bssid);
+
+ for (i = 0; i < scan_res->num; i++) {
+ struct wpa_scan_res *res = scan_res->res[i];
struct bgscan_learn_bss *bss;
if (!bgscan_learn_bss_match(data, res))
continue;
+
bss = bgscan_learn_get_bss(data, res->bssid);
if (bss && bss->freq != res->freq) {
wpa_printf(MSG_DEBUG, "bgscan learn: Update BSS "
bss->freq = res->freq;
dl_list_add(&data->bss, &bss->list);
}
+
+ for (j = 0; j < num_bssid; j++) {
+ u8 *addr = bssid + j * ETH_ALEN;
+ bgscan_learn_add_neighbor(bss, addr);
+ }
}
/*
}
-static void bgscan_learn_notify_signal_change(void *priv, int above)
+static void bgscan_learn_notify_signal_change(void *priv, int above,
+ int current_signal)
{
struct bgscan_learn_data *data = priv;
+ int scan = 0;
+ struct os_time now;
if (data->short_interval == data->long_interval ||
data->signal_threshold == 0)
return;
wpa_printf(MSG_DEBUG, "bgscan learn: signal level changed "
- "(above=%d)", above);
+ "(above=%d current_signal=%d)", above, current_signal);
if (data->scan_interval == data->long_interval && !above) {
- wpa_printf(MSG_DEBUG, "bgscan learn: Trigger immediate scan "
- "and start using short bgscan interval");
+ wpa_printf(MSG_DEBUG, "bgscan learn: Start using short bgscan "
+ "interval");
data->scan_interval = data->short_interval;
- eloop_cancel_timeout(bgscan_learn_timeout, data, NULL);
- eloop_register_timeout(0, 0, bgscan_learn_timeout, data,
- NULL);
+ os_get_time(&now);
+ if (now.sec > data->last_bgscan.sec + 1)
+ scan = 1;
} else if (data->scan_interval == data->short_interval && above) {
wpa_printf(MSG_DEBUG, "bgscan learn: Start using long bgscan "
"interval");
eloop_register_timeout(data->scan_interval, 0,
bgscan_learn_timeout, data, NULL);
} else if (!above) {
- struct os_time now;
/*
* Signal dropped further 4 dB. Request a new scan if we have
* not yet scanned in a while.
*/
os_get_time(&now);
- if (now.sec > data->last_bgscan.sec + 10) {
- wpa_printf(MSG_DEBUG, "bgscan learn: Trigger "
- "immediate scan");
- eloop_cancel_timeout(bgscan_learn_timeout, data,
- NULL);
- eloop_register_timeout(0, 0, bgscan_learn_timeout,
- data, NULL);
- }
+ if (now.sec > data->last_bgscan.sec + 10)
+ scan = 1;
+ }
+
+ if (scan) {
+ wpa_printf(MSG_DEBUG, "bgscan learn: Trigger immediate scan");
+ eloop_cancel_timeout(bgscan_learn_timeout, data, NULL);
+ eloop_register_timeout(0, 0, bgscan_learn_timeout, data, NULL);
}
}
projects / libeap.git / blobdiff