3 * Copyright (c) 2009-2012, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
9 #include "utils/includes.h"
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "common/ieee802_11_defs.h"
14 #include "drivers/driver.h"
15 #include "wpa_supplicant_i.h"
23 * WPA_BSS_EXPIRATION_PERIOD - Period of expiration run in seconds
25 #define WPA_BSS_EXPIRATION_PERIOD 10
27 #define WPA_BSS_FREQ_CHANGED_FLAG BIT(0)
28 #define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1)
29 #define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2)
30 #define WPA_BSS_MODE_CHANGED_FLAG BIT(3)
31 #define WPA_BSS_WPAIE_CHANGED_FLAG BIT(4)
32 #define WPA_BSS_RSNIE_CHANGED_FLAG BIT(5)
33 #define WPA_BSS_WPS_CHANGED_FLAG BIT(6)
34 #define WPA_BSS_RATES_CHANGED_FLAG BIT(7)
35 #define WPA_BSS_IES_CHANGED_FLAG BIT(8)
38 static void wpa_bss_set_hessid(struct wpa_bss *bss)
40 #ifdef CONFIG_INTERWORKING
41 const u8 *ie = wpa_bss_get_ie(bss, WLAN_EID_INTERWORKING);
42 if (ie == NULL || (ie[1] != 7 && ie[1] != 9)) {
43 os_memset(bss->hessid, 0, ETH_ALEN);
47 os_memcpy(bss->hessid, ie + 3, ETH_ALEN);
49 os_memcpy(bss->hessid, ie + 5, ETH_ALEN);
50 #endif /* CONFIG_INTERWORKING */
55 * wpa_bss_anqp_alloc - Allocate ANQP data structure for a BSS entry
56 * Returns: Allocated ANQP data structure or %NULL on failure
58 * The allocated ANQP data structure has its users count set to 1. It may be
59 * shared by multiple BSS entries and each shared entry is freed with
60 * wpa_bss_anqp_free().
62 struct wpa_bss_anqp * wpa_bss_anqp_alloc(void)
64 struct wpa_bss_anqp *anqp;
65 anqp = os_zalloc(sizeof(*anqp));
74 * wpa_bss_anqp_clone - Clone an ANQP data structure
75 * @anqp: ANQP data structure from wpa_bss_anqp_alloc()
76 * Returns: Cloned ANQP data structure or %NULL on failure
78 static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp)
80 struct wpa_bss_anqp *n;
82 n = os_zalloc(sizeof(*n));
86 #define ANQP_DUP(f) if (anqp->f) n->f = wpabuf_dup(anqp->f)
87 #ifdef CONFIG_INTERWORKING
89 ANQP_DUP(network_auth_type);
90 ANQP_DUP(roaming_consortium);
91 ANQP_DUP(ip_addr_type_availability);
94 ANQP_DUP(domain_name);
95 #endif /* CONFIG_INTERWORKING */
97 ANQP_DUP(hs20_operator_friendly_name);
98 ANQP_DUP(hs20_wan_metrics);
99 ANQP_DUP(hs20_connection_capability);
100 ANQP_DUP(hs20_operating_class);
101 ANQP_DUP(hs20_osu_providers_list);
102 #endif /* CONFIG_HS20 */
110 * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry
112 * Returns: 0 on success, -1 on failure
114 * This function ensures the specific BSS entry has an ANQP data structure that
115 * is not shared with any other BSS entry.
117 int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss)
119 struct wpa_bss_anqp *anqp;
121 if (bss->anqp && bss->anqp->users > 1) {
122 /* allocated, but shared - clone an unshared copy */
123 anqp = wpa_bss_anqp_clone(bss->anqp);
133 return 0; /* already allocated and not shared */
135 /* not allocated - allocate a new storage area */
136 bss->anqp = wpa_bss_anqp_alloc();
137 return bss->anqp ? 0 : -1;
142 * wpa_bss_anqp_free - Free an ANQP data structure
143 * @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone()
145 static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp)
151 if (anqp->users > 0) {
152 /* Another BSS entry holds a pointer to this ANQP info */
156 #ifdef CONFIG_INTERWORKING
157 wpabuf_free(anqp->venue_name);
158 wpabuf_free(anqp->network_auth_type);
159 wpabuf_free(anqp->roaming_consortium);
160 wpabuf_free(anqp->ip_addr_type_availability);
161 wpabuf_free(anqp->nai_realm);
162 wpabuf_free(anqp->anqp_3gpp);
163 wpabuf_free(anqp->domain_name);
164 #endif /* CONFIG_INTERWORKING */
166 wpabuf_free(anqp->hs20_operator_friendly_name);
167 wpabuf_free(anqp->hs20_wan_metrics);
168 wpabuf_free(anqp->hs20_connection_capability);
169 wpabuf_free(anqp->hs20_operating_class);
170 wpabuf_free(anqp->hs20_osu_providers_list);
171 #endif /* CONFIG_HS20 */
177 static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
180 if (wpa_s->last_scan_res) {
182 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
183 if (wpa_s->last_scan_res[i] == bss) {
184 os_memmove(&wpa_s->last_scan_res[i],
185 &wpa_s->last_scan_res[i + 1],
186 (wpa_s->last_scan_res_used - i - 1)
187 * sizeof(struct wpa_bss *));
188 wpa_s->last_scan_res_used--;
193 dl_list_del(&bss->list);
194 dl_list_del(&bss->list_id);
196 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
197 " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
198 wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
199 wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
200 wpa_bss_anqp_free(bss->anqp);
206 * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID
207 * @wpa_s: Pointer to wpa_supplicant data
210 * @ssid_len: Length of @ssid
211 * Returns: Pointer to the BSS entry or %NULL if not found
213 struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
214 const u8 *ssid, size_t ssid_len)
217 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
219 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
220 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
221 bss->ssid_len == ssid_len &&
222 os_memcmp(bss->ssid, ssid, ssid_len) == 0)
229 static void calculate_update_time(const struct os_reltime *fetch_time,
231 struct os_reltime *update_time)
235 update_time->sec = fetch_time->sec;
236 update_time->usec = fetch_time->usec;
237 update_time->sec -= age_ms / 1000;
238 usec = (age_ms % 1000) * 1000;
239 if (update_time->usec < usec) {
241 update_time->usec += 1000000;
243 update_time->usec -= usec;
247 static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src,
248 struct os_reltime *fetch_time)
250 dst->flags = src->flags;
251 os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
252 dst->freq = src->freq;
253 dst->beacon_int = src->beacon_int;
254 dst->caps = src->caps;
255 dst->qual = src->qual;
256 dst->noise = src->noise;
257 dst->level = src->level;
260 calculate_update_time(fetch_time, src->age, &dst->last_update);
264 static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
266 struct wpa_ssid *ssid;
268 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
269 if (ssid->ssid == NULL || ssid->ssid_len == 0)
271 if (ssid->ssid_len == bss->ssid_len &&
272 os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
280 static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
282 return bss == wpa_s->current_bss ||
283 os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
284 os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0;
288 static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
292 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
293 if (!wpa_bss_known(wpa_s, bss)) {
294 wpa_bss_remove(wpa_s, bss, __func__);
303 static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
308 * Remove the oldest entry that does not match with any configured
311 if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
315 * Remove the oldest entry that isn't currently in use.
317 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
318 if (!wpa_bss_in_use(wpa_s, bss)) {
319 wpa_bss_remove(wpa_s, bss, __func__);
328 static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
329 const u8 *ssid, size_t ssid_len,
330 struct wpa_scan_res *res,
331 struct os_reltime *fetch_time)
335 bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
338 bss->id = wpa_s->bss_next_id++;
339 bss->last_update_idx = wpa_s->bss_update_idx;
340 wpa_bss_copy_res(bss, res, fetch_time);
341 os_memcpy(bss->ssid, ssid, ssid_len);
342 bss->ssid_len = ssid_len;
343 bss->ie_len = res->ie_len;
344 bss->beacon_ie_len = res->beacon_ie_len;
345 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
346 wpa_bss_set_hessid(bss);
348 if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count &&
349 wpa_bss_remove_oldest(wpa_s) != 0) {
350 wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
351 "because all BSSes are in use. We should normally "
352 "not get here!", (int) wpa_s->num_bss + 1);
353 wpa_s->conf->bss_max_count = wpa_s->num_bss + 1;
356 dl_list_add_tail(&wpa_s->bss, &bss->list);
357 dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
359 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
361 bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
362 wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
367 static int are_ies_equal(const struct wpa_bss *old,
368 const struct wpa_scan_res *new, u32 ie)
370 const u8 *old_ie, *new_ie;
371 struct wpabuf *old_ie_buff = NULL;
372 struct wpabuf *new_ie_buff = NULL;
373 int new_ie_len, old_ie_len, ret, is_multi;
376 case WPA_IE_VENDOR_TYPE:
377 old_ie = wpa_bss_get_vendor_ie(old, ie);
378 new_ie = wpa_scan_get_vendor_ie(new, ie);
381 case WPS_IE_VENDOR_TYPE:
382 old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
383 new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie);
387 case WLAN_EID_SUPP_RATES:
388 case WLAN_EID_EXT_SUPP_RATES:
389 old_ie = wpa_bss_get_ie(old, ie);
390 new_ie = wpa_scan_get_ie(new, ie);
394 wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
399 /* in case of multiple IEs stored in buffer */
400 old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
401 new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
402 old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
403 new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
405 /* in case of single IE */
406 old_ie_len = old_ie ? old_ie[1] + 2 : 0;
407 new_ie_len = new_ie ? new_ie[1] + 2 : 0;
410 if (!old_ie || !new_ie)
411 ret = !old_ie && !new_ie;
413 ret = (old_ie_len == new_ie_len &&
414 os_memcmp(old_ie, new_ie, old_ie_len) == 0);
416 wpabuf_free(old_ie_buff);
417 wpabuf_free(new_ie_buff);
423 static u32 wpa_bss_compare_res(const struct wpa_bss *old,
424 const struct wpa_scan_res *new)
427 int caps_diff = old->caps ^ new->caps;
429 if (old->freq != new->freq)
430 changes |= WPA_BSS_FREQ_CHANGED_FLAG;
432 if (old->level != new->level)
433 changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
435 if (caps_diff & IEEE80211_CAP_PRIVACY)
436 changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
438 if (caps_diff & IEEE80211_CAP_IBSS)
439 changes |= WPA_BSS_MODE_CHANGED_FLAG;
441 if (old->ie_len == new->ie_len &&
442 os_memcmp(old + 1, new + 1, old->ie_len) == 0)
444 changes |= WPA_BSS_IES_CHANGED_FLAG;
446 if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
447 changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
449 if (!are_ies_equal(old, new, WLAN_EID_RSN))
450 changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
452 if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE))
453 changes |= WPA_BSS_WPS_CHANGED_FLAG;
455 if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) ||
456 !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES))
457 changes |= WPA_BSS_RATES_CHANGED_FLAG;
463 static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
464 const struct wpa_bss *bss)
466 if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
467 wpas_notify_bss_freq_changed(wpa_s, bss->id);
469 if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
470 wpas_notify_bss_signal_changed(wpa_s, bss->id);
472 if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
473 wpas_notify_bss_privacy_changed(wpa_s, bss->id);
475 if (changes & WPA_BSS_MODE_CHANGED_FLAG)
476 wpas_notify_bss_mode_changed(wpa_s, bss->id);
478 if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
479 wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
481 if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
482 wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
484 if (changes & WPA_BSS_WPS_CHANGED_FLAG)
485 wpas_notify_bss_wps_changed(wpa_s, bss->id);
487 if (changes & WPA_BSS_IES_CHANGED_FLAG)
488 wpas_notify_bss_ies_changed(wpa_s, bss->id);
490 if (changes & WPA_BSS_RATES_CHANGED_FLAG)
491 wpas_notify_bss_rates_changed(wpa_s, bss->id);
493 wpas_notify_bss_seen(wpa_s, bss->id);
497 static struct wpa_bss *
498 wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
499 struct wpa_scan_res *res, struct os_reltime *fetch_time)
503 changes = wpa_bss_compare_res(bss, res);
504 bss->scan_miss_count = 0;
505 bss->last_update_idx = wpa_s->bss_update_idx;
506 wpa_bss_copy_res(bss, res, fetch_time);
507 /* Move the entry to the end of the list */
508 dl_list_del(&bss->list);
510 if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) &&
511 !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) {
513 * This can happen when non-P2P station interface runs a scan
514 * without P2P IE in the Probe Request frame. P2P GO would reply
515 * to that with a Probe Response that does not include P2P IE.
516 * Do not update the IEs in this BSS entry to avoid such loss of
517 * information that may be needed for P2P operations to
518 * determine group information.
520 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for "
521 MACSTR " since that would remove P2P IE information",
522 MAC2STR(bss->bssid));
524 #endif /* CONFIG_P2P */
525 if (bss->ie_len + bss->beacon_ie_len >=
526 res->ie_len + res->beacon_ie_len) {
527 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
528 bss->ie_len = res->ie_len;
529 bss->beacon_ie_len = res->beacon_ie_len;
531 struct wpa_bss *nbss;
532 struct dl_list *prev = bss->list_id.prev;
533 dl_list_del(&bss->list_id);
534 nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
538 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
539 if (wpa_s->last_scan_res[i] == bss) {
540 wpa_s->last_scan_res[i] = nbss;
544 if (wpa_s->current_bss == bss)
545 wpa_s->current_bss = nbss;
547 os_memcpy(bss + 1, res + 1,
548 res->ie_len + res->beacon_ie_len);
549 bss->ie_len = res->ie_len;
550 bss->beacon_ie_len = res->beacon_ie_len;
552 dl_list_add(prev, &bss->list_id);
554 if (changes & WPA_BSS_IES_CHANGED_FLAG)
555 wpa_bss_set_hessid(bss);
556 dl_list_add_tail(&wpa_s->bss, &bss->list);
558 notify_bss_changes(wpa_s, changes, bss);
565 * wpa_bss_update_start - Start a BSS table update from scan results
566 * @wpa_s: Pointer to wpa_supplicant data
568 * This function is called at the start of each BSS table update round for new
569 * scan results. The actual scan result entries are indicated with calls to
570 * wpa_bss_update_scan_res() and the update round is finished with a call to
571 * wpa_bss_update_end().
573 void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
575 wpa_s->bss_update_idx++;
576 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
577 wpa_s->bss_update_idx);
578 wpa_s->last_scan_res_used = 0;
583 * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
584 * @wpa_s: Pointer to wpa_supplicant data
586 * @fetch_time: Time when the result was fetched from the driver
588 * This function updates a BSS table entry (or adds one) based on a scan result.
589 * This is called separately for each scan result between the calls to
590 * wpa_bss_update_start() and wpa_bss_update_end().
592 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
593 struct wpa_scan_res *res,
594 struct os_reltime *fetch_time)
596 const u8 *ssid, *p2p;
599 if (wpa_s->conf->ignore_old_scan_res) {
600 struct os_reltime update;
601 calculate_update_time(fetch_time, res->age, &update);
602 if (os_reltime_before(&update, &wpa_s->scan_trigger_time)) {
603 struct os_reltime age;
604 os_reltime_sub(&wpa_s->scan_trigger_time, &update,
606 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS "
607 "table entry that is %u.%06u seconds older "
608 "than our scan trigger",
609 (unsigned int) age.sec,
610 (unsigned int) age.usec);
615 ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
617 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
618 MACSTR, MAC2STR(res->bssid));
622 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
623 MACSTR, MAC2STR(res->bssid));
627 p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
630 wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
632 * If it's a P2P specific interface, then don't update
633 * the scan result without a P2P IE.
635 wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
636 " update for P2P interface", MAC2STR(res->bssid));
639 #endif /* CONFIG_P2P */
640 if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
641 os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
642 return; /* Skip P2P listen discovery results here */
644 /* TODO: add option for ignoring BSSes we are not interested in
645 * (to save memory) */
646 bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
648 bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time);
650 bss = wpa_bss_update(wpa_s, bss, res, fetch_time);
651 if (wpa_s->last_scan_res) {
653 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
654 if (bss == wpa_s->last_scan_res[i]) {
655 /* Already in the list */
664 if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
667 if (wpa_s->last_scan_res_size == 0)
670 siz = wpa_s->last_scan_res_size * 2;
671 n = os_realloc_array(wpa_s->last_scan_res, siz,
672 sizeof(struct wpa_bss *));
675 wpa_s->last_scan_res = n;
676 wpa_s->last_scan_res_size = siz;
679 if (wpa_s->last_scan_res)
680 wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
684 static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
685 const struct scan_info *info)
693 if (info->num_freqs) {
695 for (i = 0; i < info->num_freqs; i++) {
696 if (bss->freq == info->freqs[i]) {
705 if (info->num_ssids) {
707 for (i = 0; i < info->num_ssids; i++) {
708 const struct wpa_driver_scan_ssid *s = &info->ssids[i];
709 if ((s->ssid == NULL || s->ssid_len == 0) ||
710 (s->ssid_len == bss->ssid_len &&
711 os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
726 * wpa_bss_update_end - End a BSS table update from scan results
727 * @wpa_s: Pointer to wpa_supplicant data
728 * @info: Information about scan parameters
729 * @new_scan: Whether this update round was based on a new scan
731 * This function is called at the end of each BSS table update round for new
732 * scan results. The start of the update was indicated with a call to
733 * wpa_bss_update_start().
735 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
738 struct wpa_bss *bss, *n;
740 os_get_reltime(&wpa_s->last_scan);
742 return; /* do not expire entries without new scan */
744 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
745 if (wpa_bss_in_use(wpa_s, bss))
747 if (!wpa_bss_included_in_scan(bss, info))
748 continue; /* expire only BSSes that were scanned */
749 if (bss->last_update_idx < wpa_s->bss_update_idx)
750 bss->scan_miss_count++;
751 if (bss->scan_miss_count >=
752 wpa_s->conf->bss_expiration_scan_count) {
753 wpa_bss_remove(wpa_s, bss, "no match in scan");
757 wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u",
758 wpa_s->last_scan_res_used, wpa_s->last_scan_res_size);
763 * wpa_bss_flush_by_age - Flush old BSS entries
764 * @wpa_s: Pointer to wpa_supplicant data
765 * @age: Maximum entry age in seconds
767 * Remove BSS entries that have not been updated during the last @age seconds.
769 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
771 struct wpa_bss *bss, *n;
774 if (dl_list_empty(&wpa_s->bss))
780 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
781 if (wpa_bss_in_use(wpa_s, bss))
784 if (os_reltime_before(&bss->last_update, &t)) {
785 wpa_bss_remove(wpa_s, bss, __func__);
792 static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
794 struct wpa_supplicant *wpa_s = eloop_ctx;
796 wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
797 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
798 wpa_bss_timeout, wpa_s, NULL);
803 * wpa_bss_init - Initialize BSS table
804 * @wpa_s: Pointer to wpa_supplicant data
805 * Returns: 0 on success, -1 on failure
807 * This prepares BSS table lists and timer for periodic updates. The BSS table
808 * is deinitialized with wpa_bss_deinit() once not needed anymore.
810 int wpa_bss_init(struct wpa_supplicant *wpa_s)
812 dl_list_init(&wpa_s->bss);
813 dl_list_init(&wpa_s->bss_id);
814 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
815 wpa_bss_timeout, wpa_s, NULL);
821 * wpa_bss_flush - Flush all unused BSS entries
822 * @wpa_s: Pointer to wpa_supplicant data
824 void wpa_bss_flush(struct wpa_supplicant *wpa_s)
826 struct wpa_bss *bss, *n;
828 wpa_s->clear_driver_scan_cache = 1;
830 if (wpa_s->bss.next == NULL)
831 return; /* BSS table not yet initialized */
833 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
834 if (wpa_bss_in_use(wpa_s, bss))
836 wpa_bss_remove(wpa_s, bss, __func__);
842 * wpa_bss_deinit - Deinitialize BSS table
843 * @wpa_s: Pointer to wpa_supplicant data
845 void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
847 eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
848 wpa_bss_flush(wpa_s);
853 * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
854 * @wpa_s: Pointer to wpa_supplicant data
856 * Returns: Pointer to the BSS entry or %NULL if not found
858 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
862 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
864 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
865 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
873 * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
874 * @wpa_s: Pointer to wpa_supplicant data
876 * Returns: Pointer to the BSS entry or %NULL if not found
878 * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to
879 * find the entry that has the most recent update. This can help in finding the
880 * correct entry in cases where the SSID of the AP may have changed recently
881 * (e.g., in WPS reconfiguration cases).
883 struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
886 struct wpa_bss *bss, *found = NULL;
887 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
889 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
890 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0)
893 os_reltime_before(&found->last_update, &bss->last_update))
902 * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr
903 * @wpa_s: Pointer to wpa_supplicant data
904 * @dev_addr: P2P Device Address of the GO
905 * Returns: Pointer to the BSS entry or %NULL if not found
907 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
911 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
913 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
915 os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
920 #endif /* CONFIG_P2P */
924 * wpa_bss_get_id - Fetch a BSS table entry based on identifier
925 * @wpa_s: Pointer to wpa_supplicant data
926 * @id: Unique identifier (struct wpa_bss::id) assigned for the entry
927 * Returns: Pointer to the BSS entry or %NULL if not found
929 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
932 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
941 * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range
942 * @wpa_s: Pointer to wpa_supplicant data
943 * @idf: Smallest allowed identifier assigned for the entry
944 * @idf: Largest allowed identifier assigned for the entry
945 * Returns: Pointer to the BSS entry or %NULL if not found
947 * This function is similar to wpa_bss_get_id() but allows a BSS entry with the
948 * smallest id value to be fetched within the specified range without the
949 * caller having to know the exact id.
951 struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
952 unsigned int idf, unsigned int idl)
955 dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) {
956 if (bss->id >= idf && bss->id <= idl)
964 * wpa_bss_get_ie - Fetch a specified information element from a BSS entry
965 * @bss: BSS table entry
966 * @ie: Information element identitifier (WLAN_EID_*)
967 * Returns: Pointer to the information element (id field) or %NULL if not found
969 * This function returns the first matching information element in the BSS
972 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
976 pos = (const u8 *) (bss + 1);
977 end = pos + bss->ie_len;
979 while (pos + 1 < end) {
980 if (pos + 2 + pos[1] > end)
992 * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry
993 * @bss: BSS table entry
994 * @vendor_type: Vendor type (four octets starting the IE payload)
995 * Returns: Pointer to the information element (id field) or %NULL if not found
997 * This function returns the first matching information element in the BSS
1000 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
1002 const u8 *end, *pos;
1004 pos = (const u8 *) (bss + 1);
1005 end = pos + bss->ie_len;
1007 while (pos + 1 < end) {
1008 if (pos + 2 + pos[1] > end)
1010 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1011 vendor_type == WPA_GET_BE32(&pos[2]))
1021 * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry
1022 * @bss: BSS table entry
1023 * @vendor_type: Vendor type (four octets starting the IE payload)
1024 * Returns: Pointer to the information element (id field) or %NULL if not found
1026 * This function returns the first matching information element in the BSS
1029 * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only
1030 * from Beacon frames instead of either Beacon or Probe Response frames.
1032 const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
1035 const u8 *end, *pos;
1037 if (bss->beacon_ie_len == 0)
1040 pos = (const u8 *) (bss + 1);
1042 end = pos + bss->beacon_ie_len;
1044 while (pos + 1 < end) {
1045 if (pos + 2 + pos[1] > end)
1047 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1048 vendor_type == WPA_GET_BE32(&pos[2]))
1058 * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
1059 * @bss: BSS table entry
1060 * @vendor_type: Vendor type (four octets starting the IE payload)
1061 * Returns: Pointer to the information element payload or %NULL if not found
1063 * This function returns concatenated payload of possibly fragmented vendor
1064 * specific information elements in the BSS entry. The caller is responsible for
1065 * freeing the returned buffer.
1067 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
1071 const u8 *end, *pos;
1073 buf = wpabuf_alloc(bss->ie_len);
1077 pos = (const u8 *) (bss + 1);
1078 end = pos + bss->ie_len;
1080 while (pos + 1 < end) {
1081 if (pos + 2 + pos[1] > end)
1083 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1084 vendor_type == WPA_GET_BE32(&pos[2]))
1085 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1089 if (wpabuf_len(buf) == 0) {
1099 * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry
1100 * @bss: BSS table entry
1101 * @vendor_type: Vendor type (four octets starting the IE payload)
1102 * Returns: Pointer to the information element payload or %NULL if not found
1104 * This function returns concatenated payload of possibly fragmented vendor
1105 * specific information elements in the BSS entry. The caller is responsible for
1106 * freeing the returned buffer.
1108 * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only
1109 * from Beacon frames instead of either Beacon or Probe Response frames.
1111 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
1115 const u8 *end, *pos;
1117 buf = wpabuf_alloc(bss->beacon_ie_len);
1121 pos = (const u8 *) (bss + 1);
1123 end = pos + bss->beacon_ie_len;
1125 while (pos + 1 < end) {
1126 if (pos + 2 + pos[1] > end)
1128 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1129 vendor_type == WPA_GET_BE32(&pos[2]))
1130 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1134 if (wpabuf_len(buf) == 0) {
1144 * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS
1145 * @bss: BSS table entry
1146 * Returns: Maximum legacy rate in units of 500 kbps
1148 int wpa_bss_get_max_rate(const struct wpa_bss *bss)
1154 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1155 for (i = 0; ie && i < ie[1]; i++) {
1156 if ((ie[i + 2] & 0x7f) > rate)
1157 rate = ie[i + 2] & 0x7f;
1160 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1161 for (i = 0; ie && i < ie[1]; i++) {
1162 if ((ie[i + 2] & 0x7f) > rate)
1163 rate = ie[i + 2] & 0x7f;
1171 * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS
1172 * @bss: BSS table entry
1173 * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps)
1174 * Returns: number of legacy TX rates or -1 on failure
1176 * The caller is responsible for freeing the returned buffer with os_free() in
1179 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
1186 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1187 ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1189 len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
1195 for (i = 0; ie && i < ie[1]; i++)
1196 r[i] = ie[i + 2] & 0x7f;
1198 for (j = 0; ie2 && j < ie2[1]; j++)
1199 r[i + j] = ie2[j + 2] & 0x7f;