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_update_pending_connect(struct wpa_supplicant *wpa_s,
178 struct wpa_bss *old_bss,
179 struct wpa_bss *new_bss)
181 struct wpa_radio_work *work;
182 struct wpa_connect_work *cwork;
184 work = radio_work_pending(wpa_s, "sme-connect");
186 work = radio_work_pending(wpa_s, "connect");
191 if (cwork->bss != old_bss)
194 wpa_printf(MSG_DEBUG,
195 "Update BSS pointer for the pending connect radio work");
196 cwork->bss = new_bss;
198 cwork->bss_removed = 1;
202 static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
205 if (wpa_s->last_scan_res) {
207 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
208 if (wpa_s->last_scan_res[i] == bss) {
209 os_memmove(&wpa_s->last_scan_res[i],
210 &wpa_s->last_scan_res[i + 1],
211 (wpa_s->last_scan_res_used - i - 1)
212 * sizeof(struct wpa_bss *));
213 wpa_s->last_scan_res_used--;
218 wpa_bss_update_pending_connect(wpa_s, bss, NULL);
219 dl_list_del(&bss->list);
220 dl_list_del(&bss->list_id);
222 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
223 " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
224 wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
225 wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
226 wpa_bss_anqp_free(bss->anqp);
232 * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID
233 * @wpa_s: Pointer to wpa_supplicant data
236 * @ssid_len: Length of @ssid
237 * Returns: Pointer to the BSS entry or %NULL if not found
239 struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
240 const u8 *ssid, size_t ssid_len)
243 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
245 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
246 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
247 bss->ssid_len == ssid_len &&
248 os_memcmp(bss->ssid, ssid, ssid_len) == 0)
255 static void calculate_update_time(const struct os_reltime *fetch_time,
257 struct os_reltime *update_time)
261 update_time->sec = fetch_time->sec;
262 update_time->usec = fetch_time->usec;
263 update_time->sec -= age_ms / 1000;
264 usec = (age_ms % 1000) * 1000;
265 if (update_time->usec < usec) {
267 update_time->usec += 1000000;
269 update_time->usec -= usec;
273 static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src,
274 struct os_reltime *fetch_time)
276 dst->flags = src->flags;
277 os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
278 dst->freq = src->freq;
279 dst->beacon_int = src->beacon_int;
280 dst->caps = src->caps;
281 dst->qual = src->qual;
282 dst->noise = src->noise;
283 dst->level = src->level;
286 calculate_update_time(fetch_time, src->age, &dst->last_update);
290 static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
292 struct wpa_ssid *ssid;
294 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
295 if (ssid->ssid == NULL || ssid->ssid_len == 0)
297 if (ssid->ssid_len == bss->ssid_len &&
298 os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
306 static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
308 return bss == wpa_s->current_bss ||
309 os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
310 os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0;
314 static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
318 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
319 if (!wpa_bss_known(wpa_s, bss)) {
320 wpa_bss_remove(wpa_s, bss, __func__);
329 static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
334 * Remove the oldest entry that does not match with any configured
337 if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
341 * Remove the oldest entry that isn't currently in use.
343 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
344 if (!wpa_bss_in_use(wpa_s, bss)) {
345 wpa_bss_remove(wpa_s, bss, __func__);
354 static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
355 const u8 *ssid, size_t ssid_len,
356 struct wpa_scan_res *res,
357 struct os_reltime *fetch_time)
361 bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
364 bss->id = wpa_s->bss_next_id++;
365 bss->last_update_idx = wpa_s->bss_update_idx;
366 wpa_bss_copy_res(bss, res, fetch_time);
367 os_memcpy(bss->ssid, ssid, ssid_len);
368 bss->ssid_len = ssid_len;
369 bss->ie_len = res->ie_len;
370 bss->beacon_ie_len = res->beacon_ie_len;
371 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
372 wpa_bss_set_hessid(bss);
374 if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count &&
375 wpa_bss_remove_oldest(wpa_s) != 0) {
376 wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
377 "because all BSSes are in use. We should normally "
378 "not get here!", (int) wpa_s->num_bss + 1);
379 wpa_s->conf->bss_max_count = wpa_s->num_bss + 1;
382 dl_list_add_tail(&wpa_s->bss, &bss->list);
383 dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
385 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
387 bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
388 wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
393 static int are_ies_equal(const struct wpa_bss *old,
394 const struct wpa_scan_res *new, u32 ie)
396 const u8 *old_ie, *new_ie;
397 struct wpabuf *old_ie_buff = NULL;
398 struct wpabuf *new_ie_buff = NULL;
399 int new_ie_len, old_ie_len, ret, is_multi;
402 case WPA_IE_VENDOR_TYPE:
403 old_ie = wpa_bss_get_vendor_ie(old, ie);
404 new_ie = wpa_scan_get_vendor_ie(new, ie);
407 case WPS_IE_VENDOR_TYPE:
408 old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
409 new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie);
413 case WLAN_EID_SUPP_RATES:
414 case WLAN_EID_EXT_SUPP_RATES:
415 old_ie = wpa_bss_get_ie(old, ie);
416 new_ie = wpa_scan_get_ie(new, ie);
420 wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
425 /* in case of multiple IEs stored in buffer */
426 old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
427 new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
428 old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
429 new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
431 /* in case of single IE */
432 old_ie_len = old_ie ? old_ie[1] + 2 : 0;
433 new_ie_len = new_ie ? new_ie[1] + 2 : 0;
436 if (!old_ie || !new_ie)
437 ret = !old_ie && !new_ie;
439 ret = (old_ie_len == new_ie_len &&
440 os_memcmp(old_ie, new_ie, old_ie_len) == 0);
442 wpabuf_free(old_ie_buff);
443 wpabuf_free(new_ie_buff);
449 static u32 wpa_bss_compare_res(const struct wpa_bss *old,
450 const struct wpa_scan_res *new)
453 int caps_diff = old->caps ^ new->caps;
455 if (old->freq != new->freq)
456 changes |= WPA_BSS_FREQ_CHANGED_FLAG;
458 if (old->level != new->level)
459 changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
461 if (caps_diff & IEEE80211_CAP_PRIVACY)
462 changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
464 if (caps_diff & IEEE80211_CAP_IBSS)
465 changes |= WPA_BSS_MODE_CHANGED_FLAG;
467 if (old->ie_len == new->ie_len &&
468 os_memcmp(old + 1, new + 1, old->ie_len) == 0)
470 changes |= WPA_BSS_IES_CHANGED_FLAG;
472 if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
473 changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
475 if (!are_ies_equal(old, new, WLAN_EID_RSN))
476 changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
478 if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE))
479 changes |= WPA_BSS_WPS_CHANGED_FLAG;
481 if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) ||
482 !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES))
483 changes |= WPA_BSS_RATES_CHANGED_FLAG;
489 static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
490 const struct wpa_bss *bss)
492 if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
493 wpas_notify_bss_freq_changed(wpa_s, bss->id);
495 if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
496 wpas_notify_bss_signal_changed(wpa_s, bss->id);
498 if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
499 wpas_notify_bss_privacy_changed(wpa_s, bss->id);
501 if (changes & WPA_BSS_MODE_CHANGED_FLAG)
502 wpas_notify_bss_mode_changed(wpa_s, bss->id);
504 if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
505 wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
507 if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
508 wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
510 if (changes & WPA_BSS_WPS_CHANGED_FLAG)
511 wpas_notify_bss_wps_changed(wpa_s, bss->id);
513 if (changes & WPA_BSS_IES_CHANGED_FLAG)
514 wpas_notify_bss_ies_changed(wpa_s, bss->id);
516 if (changes & WPA_BSS_RATES_CHANGED_FLAG)
517 wpas_notify_bss_rates_changed(wpa_s, bss->id);
519 wpas_notify_bss_seen(wpa_s, bss->id);
523 static struct wpa_bss *
524 wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
525 struct wpa_scan_res *res, struct os_reltime *fetch_time)
529 changes = wpa_bss_compare_res(bss, res);
530 bss->scan_miss_count = 0;
531 bss->last_update_idx = wpa_s->bss_update_idx;
532 wpa_bss_copy_res(bss, res, fetch_time);
533 /* Move the entry to the end of the list */
534 dl_list_del(&bss->list);
536 if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) &&
537 !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) {
539 * This can happen when non-P2P station interface runs a scan
540 * without P2P IE in the Probe Request frame. P2P GO would reply
541 * to that with a Probe Response that does not include P2P IE.
542 * Do not update the IEs in this BSS entry to avoid such loss of
543 * information that may be needed for P2P operations to
544 * determine group information.
546 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for "
547 MACSTR " since that would remove P2P IE information",
548 MAC2STR(bss->bssid));
550 #endif /* CONFIG_P2P */
551 if (bss->ie_len + bss->beacon_ie_len >=
552 res->ie_len + res->beacon_ie_len) {
553 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
554 bss->ie_len = res->ie_len;
555 bss->beacon_ie_len = res->beacon_ie_len;
557 struct wpa_bss *nbss;
558 struct dl_list *prev = bss->list_id.prev;
559 dl_list_del(&bss->list_id);
560 nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
564 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
565 if (wpa_s->last_scan_res[i] == bss) {
566 wpa_s->last_scan_res[i] = nbss;
570 if (wpa_s->current_bss == bss)
571 wpa_s->current_bss = nbss;
572 wpa_bss_update_pending_connect(wpa_s, bss, nbss);
574 os_memcpy(bss + 1, res + 1,
575 res->ie_len + res->beacon_ie_len);
576 bss->ie_len = res->ie_len;
577 bss->beacon_ie_len = res->beacon_ie_len;
579 dl_list_add(prev, &bss->list_id);
581 if (changes & WPA_BSS_IES_CHANGED_FLAG)
582 wpa_bss_set_hessid(bss);
583 dl_list_add_tail(&wpa_s->bss, &bss->list);
585 notify_bss_changes(wpa_s, changes, bss);
592 * wpa_bss_update_start - Start a BSS table update from scan results
593 * @wpa_s: Pointer to wpa_supplicant data
595 * This function is called at the start of each BSS table update round for new
596 * scan results. The actual scan result entries are indicated with calls to
597 * wpa_bss_update_scan_res() and the update round is finished with a call to
598 * wpa_bss_update_end().
600 void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
602 wpa_s->bss_update_idx++;
603 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
604 wpa_s->bss_update_idx);
605 wpa_s->last_scan_res_used = 0;
610 * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
611 * @wpa_s: Pointer to wpa_supplicant data
613 * @fetch_time: Time when the result was fetched from the driver
615 * This function updates a BSS table entry (or adds one) based on a scan result.
616 * This is called separately for each scan result between the calls to
617 * wpa_bss_update_start() and wpa_bss_update_end().
619 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
620 struct wpa_scan_res *res,
621 struct os_reltime *fetch_time)
623 const u8 *ssid, *p2p, *mesh;
626 if (wpa_s->conf->ignore_old_scan_res) {
627 struct os_reltime update;
628 calculate_update_time(fetch_time, res->age, &update);
629 if (os_reltime_before(&update, &wpa_s->scan_trigger_time)) {
630 struct os_reltime age;
631 os_reltime_sub(&wpa_s->scan_trigger_time, &update,
633 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS "
634 "table entry that is %u.%06u seconds older "
635 "than our scan trigger",
636 (unsigned int) age.sec,
637 (unsigned int) age.usec);
642 ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
644 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
645 MACSTR, MAC2STR(res->bssid));
649 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
650 MACSTR, MAC2STR(res->bssid));
654 p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
657 wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
659 * If it's a P2P specific interface, then don't update
660 * the scan result without a P2P IE.
662 wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
663 " update for P2P interface", MAC2STR(res->bssid));
666 #endif /* CONFIG_P2P */
667 if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
668 os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
669 return; /* Skip P2P listen discovery results here */
671 /* TODO: add option for ignoring BSSes we are not interested in
672 * (to save memory) */
674 mesh = wpa_scan_get_ie(res, WLAN_EID_MESH_ID);
675 if (mesh && mesh[1] <= 32)
678 bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
680 bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time);
682 bss = wpa_bss_update(wpa_s, bss, res, fetch_time);
683 if (wpa_s->last_scan_res) {
685 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
686 if (bss == wpa_s->last_scan_res[i]) {
687 /* Already in the list */
696 if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
699 if (wpa_s->last_scan_res_size == 0)
702 siz = wpa_s->last_scan_res_size * 2;
703 n = os_realloc_array(wpa_s->last_scan_res, siz,
704 sizeof(struct wpa_bss *));
707 wpa_s->last_scan_res = n;
708 wpa_s->last_scan_res_size = siz;
711 if (wpa_s->last_scan_res)
712 wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
716 static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
717 const struct scan_info *info)
725 if (info->num_freqs) {
727 for (i = 0; i < info->num_freqs; i++) {
728 if (bss->freq == info->freqs[i]) {
737 if (info->num_ssids) {
739 for (i = 0; i < info->num_ssids; i++) {
740 const struct wpa_driver_scan_ssid *s = &info->ssids[i];
741 if ((s->ssid == NULL || s->ssid_len == 0) ||
742 (s->ssid_len == bss->ssid_len &&
743 os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
758 * wpa_bss_update_end - End a BSS table update from scan results
759 * @wpa_s: Pointer to wpa_supplicant data
760 * @info: Information about scan parameters
761 * @new_scan: Whether this update round was based on a new scan
763 * This function is called at the end of each BSS table update round for new
764 * scan results. The start of the update was indicated with a call to
765 * wpa_bss_update_start().
767 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
770 struct wpa_bss *bss, *n;
772 os_get_reltime(&wpa_s->last_scan);
774 return; /* do not expire entries without new scan */
776 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
777 if (wpa_bss_in_use(wpa_s, bss))
779 if (!wpa_bss_included_in_scan(bss, info))
780 continue; /* expire only BSSes that were scanned */
781 if (bss->last_update_idx < wpa_s->bss_update_idx)
782 bss->scan_miss_count++;
783 if (bss->scan_miss_count >=
784 wpa_s->conf->bss_expiration_scan_count) {
785 wpa_bss_remove(wpa_s, bss, "no match in scan");
789 wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u",
790 wpa_s->last_scan_res_used, wpa_s->last_scan_res_size);
795 * wpa_bss_flush_by_age - Flush old BSS entries
796 * @wpa_s: Pointer to wpa_supplicant data
797 * @age: Maximum entry age in seconds
799 * Remove BSS entries that have not been updated during the last @age seconds.
801 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
803 struct wpa_bss *bss, *n;
806 if (dl_list_empty(&wpa_s->bss))
812 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
813 if (wpa_bss_in_use(wpa_s, bss))
816 if (os_reltime_before(&bss->last_update, &t)) {
817 wpa_bss_remove(wpa_s, bss, __func__);
824 static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
826 struct wpa_supplicant *wpa_s = eloop_ctx;
828 wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
829 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
830 wpa_bss_timeout, wpa_s, NULL);
835 * wpa_bss_init - Initialize BSS table
836 * @wpa_s: Pointer to wpa_supplicant data
837 * Returns: 0 on success, -1 on failure
839 * This prepares BSS table lists and timer for periodic updates. The BSS table
840 * is deinitialized with wpa_bss_deinit() once not needed anymore.
842 int wpa_bss_init(struct wpa_supplicant *wpa_s)
844 dl_list_init(&wpa_s->bss);
845 dl_list_init(&wpa_s->bss_id);
846 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
847 wpa_bss_timeout, wpa_s, NULL);
853 * wpa_bss_flush - Flush all unused BSS entries
854 * @wpa_s: Pointer to wpa_supplicant data
856 void wpa_bss_flush(struct wpa_supplicant *wpa_s)
858 struct wpa_bss *bss, *n;
860 wpa_s->clear_driver_scan_cache = 1;
862 if (wpa_s->bss.next == NULL)
863 return; /* BSS table not yet initialized */
865 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
866 if (wpa_bss_in_use(wpa_s, bss))
868 wpa_bss_remove(wpa_s, bss, __func__);
874 * wpa_bss_deinit - Deinitialize BSS table
875 * @wpa_s: Pointer to wpa_supplicant data
877 void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
879 eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
880 wpa_bss_flush(wpa_s);
885 * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
886 * @wpa_s: Pointer to wpa_supplicant data
888 * Returns: Pointer to the BSS entry or %NULL if not found
890 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
894 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
896 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
897 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
905 * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
906 * @wpa_s: Pointer to wpa_supplicant data
908 * Returns: Pointer to the BSS entry or %NULL if not found
910 * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to
911 * find the entry that has the most recent update. This can help in finding the
912 * correct entry in cases where the SSID of the AP may have changed recently
913 * (e.g., in WPS reconfiguration cases).
915 struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
918 struct wpa_bss *bss, *found = NULL;
919 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
921 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
922 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0)
925 os_reltime_before(&found->last_update, &bss->last_update))
934 * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr
935 * @wpa_s: Pointer to wpa_supplicant data
936 * @dev_addr: P2P Device Address of the GO
937 * Returns: Pointer to the BSS entry or %NULL if not found
939 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
943 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
945 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
947 os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
952 #endif /* CONFIG_P2P */
956 * wpa_bss_get_id - Fetch a BSS table entry based on identifier
957 * @wpa_s: Pointer to wpa_supplicant data
958 * @id: Unique identifier (struct wpa_bss::id) assigned for the entry
959 * Returns: Pointer to the BSS entry or %NULL if not found
961 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
964 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
973 * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range
974 * @wpa_s: Pointer to wpa_supplicant data
975 * @idf: Smallest allowed identifier assigned for the entry
976 * @idf: Largest allowed identifier assigned for the entry
977 * Returns: Pointer to the BSS entry or %NULL if not found
979 * This function is similar to wpa_bss_get_id() but allows a BSS entry with the
980 * smallest id value to be fetched within the specified range without the
981 * caller having to know the exact id.
983 struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
984 unsigned int idf, unsigned int idl)
987 dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) {
988 if (bss->id >= idf && bss->id <= idl)
996 * wpa_bss_get_ie - Fetch a specified information element from a BSS entry
997 * @bss: BSS table entry
998 * @ie: Information element identitifier (WLAN_EID_*)
999 * Returns: Pointer to the information element (id field) or %NULL if not found
1001 * This function returns the first matching information element in the BSS
1004 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
1006 const u8 *end, *pos;
1008 pos = (const u8 *) (bss + 1);
1009 end = pos + bss->ie_len;
1011 while (pos + 1 < end) {
1012 if (pos + 2 + pos[1] > end)
1024 * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry
1025 * @bss: BSS table entry
1026 * @vendor_type: Vendor type (four octets starting the IE payload)
1027 * Returns: Pointer to the information element (id field) or %NULL if not found
1029 * This function returns the first matching information element in the BSS
1032 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
1034 const u8 *end, *pos;
1036 pos = (const u8 *) (bss + 1);
1037 end = pos + bss->ie_len;
1039 while (pos + 1 < end) {
1040 if (pos + 2 + pos[1] > end)
1042 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1043 vendor_type == WPA_GET_BE32(&pos[2]))
1053 * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry
1054 * @bss: BSS table entry
1055 * @vendor_type: Vendor type (four octets starting the IE payload)
1056 * Returns: Pointer to the information element (id field) or %NULL if not found
1058 * This function returns the first matching information element in the BSS
1061 * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only
1062 * from Beacon frames instead of either Beacon or Probe Response frames.
1064 const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
1067 const u8 *end, *pos;
1069 if (bss->beacon_ie_len == 0)
1072 pos = (const u8 *) (bss + 1);
1074 end = pos + bss->beacon_ie_len;
1076 while (pos + 1 < end) {
1077 if (pos + 2 + pos[1] > end)
1079 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1080 vendor_type == WPA_GET_BE32(&pos[2]))
1090 * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
1091 * @bss: BSS table entry
1092 * @vendor_type: Vendor type (four octets starting the IE payload)
1093 * Returns: Pointer to the information element payload or %NULL if not found
1095 * This function returns concatenated payload of possibly fragmented vendor
1096 * specific information elements in the BSS entry. The caller is responsible for
1097 * freeing the returned buffer.
1099 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
1103 const u8 *end, *pos;
1105 buf = wpabuf_alloc(bss->ie_len);
1109 pos = (const u8 *) (bss + 1);
1110 end = pos + bss->ie_len;
1112 while (pos + 1 < end) {
1113 if (pos + 2 + pos[1] > end)
1115 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1116 vendor_type == WPA_GET_BE32(&pos[2]))
1117 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1121 if (wpabuf_len(buf) == 0) {
1131 * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry
1132 * @bss: BSS table entry
1133 * @vendor_type: Vendor type (four octets starting the IE payload)
1134 * Returns: Pointer to the information element payload or %NULL if not found
1136 * This function returns concatenated payload of possibly fragmented vendor
1137 * specific information elements in the BSS entry. The caller is responsible for
1138 * freeing the returned buffer.
1140 * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only
1141 * from Beacon frames instead of either Beacon or Probe Response frames.
1143 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
1147 const u8 *end, *pos;
1149 buf = wpabuf_alloc(bss->beacon_ie_len);
1153 pos = (const u8 *) (bss + 1);
1155 end = pos + bss->beacon_ie_len;
1157 while (pos + 1 < end) {
1158 if (pos + 2 + pos[1] > end)
1160 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1161 vendor_type == WPA_GET_BE32(&pos[2]))
1162 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1166 if (wpabuf_len(buf) == 0) {
1176 * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS
1177 * @bss: BSS table entry
1178 * Returns: Maximum legacy rate in units of 500 kbps
1180 int wpa_bss_get_max_rate(const struct wpa_bss *bss)
1186 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1187 for (i = 0; ie && i < ie[1]; i++) {
1188 if ((ie[i + 2] & 0x7f) > rate)
1189 rate = ie[i + 2] & 0x7f;
1192 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1193 for (i = 0; ie && i < ie[1]; i++) {
1194 if ((ie[i + 2] & 0x7f) > rate)
1195 rate = ie[i + 2] & 0x7f;
1203 * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS
1204 * @bss: BSS table entry
1205 * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps)
1206 * Returns: number of legacy TX rates or -1 on failure
1208 * The caller is responsible for freeing the returned buffer with os_free() in
1211 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
1218 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1219 ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1221 len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
1227 for (i = 0; ie && i < ie[1]; i++)
1228 r[i] = ie[i + 2] & 0x7f;
1230 for (j = 0; ie2 && j < ie2[1]; j++)
1231 r[i + j] = ie2[j + 2] & 0x7f;