* BSS table
* Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
*/
#include "utils/includes.h"
*/
#define WPA_BSS_EXPIRATION_PERIOD 10
-/**
- * WPA_BSS_EXPIRATION_AGE - BSS entry age after which it can be expired
- *
- * This value control the time in seconds after which a BSS entry gets removed
- * if it has not been updated or is not in use.
- */
-#define WPA_BSS_EXPIRATION_AGE 180
-
-/**
- * WPA_BSS_EXPIRATION_SCAN_COUNT - Expire BSS after number of scans
- *
- * If the BSS entry has not been seen in this many scans, it will be removed.
- * Value 1 means that the entry is removed after the first scan without the
- * BSSID being seen. Larger values can be used to avoid BSS entries
- * disappearing if they are not visible in every scan (e.g., low signal quality
- * or interference).
- */
-#define WPA_BSS_EXPIRATION_SCAN_COUNT 2
-
#define WPA_BSS_FREQ_CHANGED_FLAG BIT(0)
#define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1)
#define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2)
#define WPA_BSS_IES_CHANGED_FLAG BIT(8)
-static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
+ const char *reason)
{
+ if (wpa_s->last_scan_res) {
+ unsigned int i;
+ for (i = 0; i < wpa_s->last_scan_res_used; i++) {
+ if (wpa_s->last_scan_res[i] == bss) {
+ os_memmove(&wpa_s->last_scan_res[i],
+ &wpa_s->last_scan_res[i + 1],
+ (wpa_s->last_scan_res_used - i - 1)
+ * sizeof(struct wpa_bss *));
+ wpa_s->last_scan_res_used--;
+ break;
+ }
+ }
+ }
dl_list_del(&bss->list);
dl_list_del(&bss->list_id);
wpa_s->num_bss--;
- wpa_printf(MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR " SSID '%s'",
- bss->id, MAC2STR(bss->bssid),
- wpa_ssid_txt(bss->ssid, bss->ssid_len));
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
+ " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
+ wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
+#ifdef CONFIG_INTERWORKING
+ wpabuf_free(bss->anqp_venue_name);
+ wpabuf_free(bss->anqp_network_auth_type);
+ wpabuf_free(bss->anqp_roaming_consortium);
+ wpabuf_free(bss->anqp_ip_addr_type_availability);
+ wpabuf_free(bss->anqp_nai_realm);
+ wpabuf_free(bss->anqp_3gpp);
+ wpabuf_free(bss->anqp_domain_name);
+#endif /* CONFIG_INTERWORKING */
+#ifdef CONFIG_HS20
+ wpabuf_free(bss->hs20_operator_friendly_name);
+ wpabuf_free(bss->hs20_wan_metrics);
+ wpabuf_free(bss->hs20_connection_capability);
+ wpabuf_free(bss->hs20_operating_class);
+#endif /* CONFIG_HS20 */
os_free(bss);
}
const u8 *ssid, size_t ssid_len)
{
struct wpa_bss *bss;
+ if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
+ return NULL;
dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
bss->ssid_len == ssid_len &&
}
-static void wpa_bss_add(struct wpa_supplicant *wpa_s,
- const u8 *ssid, size_t ssid_len,
- struct wpa_scan_res *res)
+static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+{
+ struct wpa_ssid *ssid;
+
+ for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
+ if (ssid->ssid == NULL || ssid->ssid_len == 0)
+ continue;
+ if (ssid->ssid_len == bss->ssid_len &&
+ os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
+ return 1;
+ }
+
+ return 0;
+}
+
+
+static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+{
+ return bss == wpa_s->current_bss ||
+ os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
+ os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0;
+}
+
+
+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;
+}
+
+
+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;
+}
+
+
+static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
+ const u8 *ssid, size_t ssid_len,
+ struct wpa_scan_res *res)
{
struct wpa_bss *bss;
bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
if (bss == NULL)
- return;
+ return NULL;
bss->id = wpa_s->bss_next_id++;
bss->last_update_idx = wpa_s->bss_update_idx;
wpa_bss_copy_res(bss, res);
dl_list_add_tail(&wpa_s->bss, &bss->list);
dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
wpa_s->num_bss++;
- wpa_printf(MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR " SSID '%s'",
- bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
+ " SSID '%s'",
+ bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
- if (wpa_s->num_bss > wpa_s->conf->bss_max_count) {
- /* Remove the oldest entry */
- wpa_bss_remove(wpa_s, dl_list_first(&wpa_s->bss,
- struct wpa_bss, list));
+ if (wpa_s->num_bss > wpa_s->conf->bss_max_count &&
+ wpa_bss_remove_oldest(wpa_s) != 0) {
+ wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
+ "because all BSSes are in use. We should normally "
+ "not get here!", (int) wpa_s->num_bss);
+ wpa_s->conf->bss_max_count = wpa_s->num_bss;
}
+ return bss;
}
new_ie_len = new_ie ? new_ie[1] + 2 : 0;
}
- ret = (old_ie_len == new_ie_len &&
- os_memcmp(old_ie, new_ie, old_ie_len) == 0);
+ if (!old_ie || !new_ie)
+ ret = !old_ie && !new_ie;
+ else
+ ret = (old_ie_len == new_ie_len &&
+ os_memcmp(old_ie, new_ie, old_ie_len) == 0);
wpabuf_free(old_ie_buff);
wpabuf_free(new_ie_buff);
nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
res->beacon_ie_len);
if (nbss) {
+ if (wpa_s->current_bss == bss)
+ wpa_s->current_bss = nbss;
bss = nbss;
os_memcpy(bss + 1, res + 1,
res->ie_len + res->beacon_ie_len);
}
-static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
-{
- return bss == wpa_s->current_bss ||
- os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
- os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0;
-}
-
-
void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
{
wpa_s->bss_update_idx++;
- wpa_printf(MSG_DEBUG, "BSS: Start scan result update %u",
- wpa_s->bss_update_idx);
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
+ wpa_s->bss_update_idx);
+ wpa_s->last_scan_res_used = 0;
}
void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
struct wpa_scan_res *res)
{
- const u8 *ssid;
+ const u8 *ssid, *p2p;
struct wpa_bss *bss;
ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
if (ssid == NULL) {
- wpa_printf(MSG_DEBUG, "BSS: No SSID IE included for " MACSTR,
- MAC2STR(res->bssid));
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
+ MACSTR, MAC2STR(res->bssid));
return;
}
if (ssid[1] > 32) {
- wpa_printf(MSG_DEBUG, "BSS: Too long SSID IE included for "
- MACSTR, MAC2STR(res->bssid));
+ wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
+ MACSTR, MAC2STR(res->bssid));
return;
}
+ p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
+#ifdef CONFIG_P2P
+ if (p2p == NULL &&
+ wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
+ /*
+ * If it's a P2P specific interface, then don't update
+ * the scan result without a P2P IE.
+ */
+ wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
+ " update for P2P interface", MAC2STR(res->bssid));
+ return;
+ }
+#endif /* CONFIG_P2P */
+ if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
+ os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
+ return; /* Skip P2P listen discovery results here */
+
/* TODO: add option for ignoring BSSes we are not interested in
* (to save memory) */
bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
if (bss == NULL)
- wpa_bss_add(wpa_s, ssid + 2, ssid[1], res);
+ bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res);
else
wpa_bss_update(wpa_s, bss, res);
+
+ if (bss == NULL)
+ return;
+ if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
+ struct wpa_bss **n;
+ unsigned int siz;
+ if (wpa_s->last_scan_res_size == 0)
+ siz = 32;
+ else
+ siz = wpa_s->last_scan_res_size * 2;
+ n = os_realloc_array(wpa_s->last_scan_res, siz,
+ sizeof(struct wpa_bss *));
+ if (n == NULL)
+ return;
+ wpa_s->last_scan_res = n;
+ wpa_s->last_scan_res_size = siz;
+ }
+
+ wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
}
{
struct wpa_bss *bss, *n;
+ wpa_s->last_scan_full = 0;
+ os_get_time(&wpa_s->last_scan);
if (!new_scan)
return; /* do not expire entries without new scan */
+ if (info && !info->aborted && !info->freqs) {
+ size_t i;
+ if (info->num_ssids == 0) {
+ wpa_s->last_scan_full = 1;
+ } else {
+ for (i = 0; i < info->num_ssids; i++) {
+ if (info->ssids[i].ssid == NULL ||
+ info->ssids[i].ssid_len == 0) {
+ wpa_s->last_scan_full = 1;
+ break;
+ }
+ }
+ }
+ }
+
dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
if (wpa_bss_in_use(wpa_s, bss))
continue;
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_BSS_EXPIRATION_SCAN_COUNT) {
- wpa_printf(MSG_DEBUG, "BSS: Expire BSS %u due to no "
- "match in scan", bss->id);
- wpa_bss_remove(wpa_s, bss);
+ 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 "
+ "last_scan_full=%d",
+ wpa_s->last_scan_res_used, wpa_s->last_scan_res_size,
+ wpa_s->last_scan_full);
}
-static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
+void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
{
- struct wpa_supplicant *wpa_s = eloop_ctx;
struct wpa_bss *bss, *n;
struct os_time t;
return;
os_get_time(&t);
- t.sec -= WPA_BSS_EXPIRATION_AGE;
+ 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_time_before(&bss->last_update, &t)) {
- wpa_printf(MSG_DEBUG, "BSS: Expire BSS %u due to age",
- bss->id);
- wpa_bss_remove(wpa_s, bss);
+ wpa_bss_remove(wpa_s, bss, __func__);
} else
break;
}
+}
+
+
+static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
+{
+ struct wpa_supplicant *wpa_s = eloop_ctx;
+
+ wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
wpa_bss_timeout, wpa_s, NULL);
}
}
-void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
+void wpa_bss_flush(struct wpa_supplicant *wpa_s)
{
struct wpa_bss *bss, *n;
- eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
+
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)
- wpa_bss_remove(wpa_s, bss);
+
+ 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__);
+ }
+}
+
+
+void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
+{
+ eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
+ wpa_bss_flush(wpa_s);
}
const u8 *bssid)
{
struct wpa_bss *bss;
- dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
+ if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
+ return NULL;
+ dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
return bss;
}
}
+#ifdef CONFIG_P2P
+struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
+ const u8 *dev_addr)
+{
+ struct wpa_bss *bss;
+ dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
+ u8 addr[ETH_ALEN];
+ if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
+ addr) == 0 &&
+ os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
+ return bss;
+ }
+ return NULL;
+}
+#endif /* CONFIG_P2P */
+
+
struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
{
struct wpa_bss *bss;
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