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 #endif /* CONFIG_HS20 */
109 * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry
111 * Returns: 0 on success, -1 on failure
113 * This function ensures the specific BSS entry has an ANQP data structure that
114 * is not shared with any other BSS entry.
116 int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss)
118 struct wpa_bss_anqp *anqp;
120 if (bss->anqp && bss->anqp->users > 1) {
121 /* allocated, but shared - clone an unshared copy */
122 anqp = wpa_bss_anqp_clone(bss->anqp);
132 return 0; /* already allocated and not shared */
134 /* not allocated - allocate a new storage area */
135 bss->anqp = wpa_bss_anqp_alloc();
136 return bss->anqp ? 0 : -1;
141 * wpa_bss_anqp_free - Free an ANQP data structure
142 * @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone()
144 static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp)
150 if (anqp->users > 0) {
151 /* Another BSS entry holds a pointer to this ANQP info */
155 #ifdef CONFIG_INTERWORKING
156 wpabuf_free(anqp->venue_name);
157 wpabuf_free(anqp->network_auth_type);
158 wpabuf_free(anqp->roaming_consortium);
159 wpabuf_free(anqp->ip_addr_type_availability);
160 wpabuf_free(anqp->nai_realm);
161 wpabuf_free(anqp->anqp_3gpp);
162 wpabuf_free(anqp->domain_name);
163 #endif /* CONFIG_INTERWORKING */
165 wpabuf_free(anqp->hs20_operator_friendly_name);
166 wpabuf_free(anqp->hs20_wan_metrics);
167 wpabuf_free(anqp->hs20_connection_capability);
168 wpabuf_free(anqp->hs20_operating_class);
169 #endif /* CONFIG_HS20 */
175 static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
178 if (wpa_s->last_scan_res) {
180 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
181 if (wpa_s->last_scan_res[i] == bss) {
182 os_memmove(&wpa_s->last_scan_res[i],
183 &wpa_s->last_scan_res[i + 1],
184 (wpa_s->last_scan_res_used - i - 1)
185 * sizeof(struct wpa_bss *));
186 wpa_s->last_scan_res_used--;
191 dl_list_del(&bss->list);
192 dl_list_del(&bss->list_id);
194 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
195 " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
196 wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
197 wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
198 wpa_bss_anqp_free(bss->anqp);
204 * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID
205 * @wpa_s: Pointer to wpa_supplicant data
208 * @ssid_len: Length of @ssid
209 * Returns: Pointer to the BSS entry or %NULL if not found
211 struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
212 const u8 *ssid, size_t ssid_len)
215 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
217 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
218 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
219 bss->ssid_len == ssid_len &&
220 os_memcmp(bss->ssid, ssid, ssid_len) == 0)
227 static void calculate_update_time(const struct os_time *fetch_time,
229 struct os_time *update_time)
233 update_time->sec = fetch_time->sec;
234 update_time->usec = fetch_time->usec;
235 update_time->sec -= age_ms / 1000;
236 usec = (age_ms % 1000) * 1000;
237 if (update_time->usec < usec) {
239 update_time->usec += 1000000;
241 update_time->usec -= usec;
245 static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src,
246 struct os_time *fetch_time)
248 dst->flags = src->flags;
249 os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
250 dst->freq = src->freq;
251 dst->beacon_int = src->beacon_int;
252 dst->caps = src->caps;
253 dst->qual = src->qual;
254 dst->noise = src->noise;
255 dst->level = src->level;
258 calculate_update_time(fetch_time, src->age, &dst->last_update);
262 static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
264 struct wpa_ssid *ssid;
266 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
267 if (ssid->ssid == NULL || ssid->ssid_len == 0)
269 if (ssid->ssid_len == bss->ssid_len &&
270 os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
278 static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
280 return bss == wpa_s->current_bss ||
281 os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
282 os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0;
286 static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
290 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
291 if (!wpa_bss_known(wpa_s, bss)) {
292 wpa_bss_remove(wpa_s, bss, __func__);
301 static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
306 * Remove the oldest entry that does not match with any configured
309 if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
313 * Remove the oldest entry that isn't currently in use.
315 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
316 if (!wpa_bss_in_use(wpa_s, bss)) {
317 wpa_bss_remove(wpa_s, bss, __func__);
326 static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
327 const u8 *ssid, size_t ssid_len,
328 struct wpa_scan_res *res,
329 struct os_time *fetch_time)
333 bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
336 bss->id = wpa_s->bss_next_id++;
337 bss->last_update_idx = wpa_s->bss_update_idx;
338 wpa_bss_copy_res(bss, res, fetch_time);
339 os_memcpy(bss->ssid, ssid, ssid_len);
340 bss->ssid_len = ssid_len;
341 bss->ie_len = res->ie_len;
342 bss->beacon_ie_len = res->beacon_ie_len;
343 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
344 wpa_bss_set_hessid(bss);
346 dl_list_add_tail(&wpa_s->bss, &bss->list);
347 dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
349 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
351 bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
352 wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
353 if (wpa_s->num_bss > wpa_s->conf->bss_max_count &&
354 wpa_bss_remove_oldest(wpa_s) != 0) {
355 wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
356 "because all BSSes are in use. We should normally "
357 "not get here!", (int) wpa_s->num_bss);
358 wpa_s->conf->bss_max_count = wpa_s->num_bss;
364 static int are_ies_equal(const struct wpa_bss *old,
365 const struct wpa_scan_res *new, u32 ie)
367 const u8 *old_ie, *new_ie;
368 struct wpabuf *old_ie_buff = NULL;
369 struct wpabuf *new_ie_buff = NULL;
370 int new_ie_len, old_ie_len, ret, is_multi;
373 case WPA_IE_VENDOR_TYPE:
374 old_ie = wpa_bss_get_vendor_ie(old, ie);
375 new_ie = wpa_scan_get_vendor_ie(new, ie);
378 case WPS_IE_VENDOR_TYPE:
379 old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
380 new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie);
384 case WLAN_EID_SUPP_RATES:
385 case WLAN_EID_EXT_SUPP_RATES:
386 old_ie = wpa_bss_get_ie(old, ie);
387 new_ie = wpa_scan_get_ie(new, ie);
391 wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
396 /* in case of multiple IEs stored in buffer */
397 old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
398 new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
399 old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
400 new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
402 /* in case of single IE */
403 old_ie_len = old_ie ? old_ie[1] + 2 : 0;
404 new_ie_len = new_ie ? new_ie[1] + 2 : 0;
407 if (!old_ie || !new_ie)
408 ret = !old_ie && !new_ie;
410 ret = (old_ie_len == new_ie_len &&
411 os_memcmp(old_ie, new_ie, old_ie_len) == 0);
413 wpabuf_free(old_ie_buff);
414 wpabuf_free(new_ie_buff);
420 static u32 wpa_bss_compare_res(const struct wpa_bss *old,
421 const struct wpa_scan_res *new)
424 int caps_diff = old->caps ^ new->caps;
426 if (old->freq != new->freq)
427 changes |= WPA_BSS_FREQ_CHANGED_FLAG;
429 if (old->level != new->level)
430 changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
432 if (caps_diff & IEEE80211_CAP_PRIVACY)
433 changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
435 if (caps_diff & IEEE80211_CAP_IBSS)
436 changes |= WPA_BSS_MODE_CHANGED_FLAG;
438 if (old->ie_len == new->ie_len &&
439 os_memcmp(old + 1, new + 1, old->ie_len) == 0)
441 changes |= WPA_BSS_IES_CHANGED_FLAG;
443 if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
444 changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
446 if (!are_ies_equal(old, new, WLAN_EID_RSN))
447 changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
449 if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE))
450 changes |= WPA_BSS_WPS_CHANGED_FLAG;
452 if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) ||
453 !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES))
454 changes |= WPA_BSS_RATES_CHANGED_FLAG;
460 static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
461 const struct wpa_bss *bss)
463 if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
464 wpas_notify_bss_freq_changed(wpa_s, bss->id);
466 if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
467 wpas_notify_bss_signal_changed(wpa_s, bss->id);
469 if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
470 wpas_notify_bss_privacy_changed(wpa_s, bss->id);
472 if (changes & WPA_BSS_MODE_CHANGED_FLAG)
473 wpas_notify_bss_mode_changed(wpa_s, bss->id);
475 if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
476 wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
478 if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
479 wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
481 if (changes & WPA_BSS_WPS_CHANGED_FLAG)
482 wpas_notify_bss_wps_changed(wpa_s, bss->id);
484 if (changes & WPA_BSS_IES_CHANGED_FLAG)
485 wpas_notify_bss_ies_changed(wpa_s, bss->id);
487 if (changes & WPA_BSS_RATES_CHANGED_FLAG)
488 wpas_notify_bss_rates_changed(wpa_s, bss->id);
492 static struct wpa_bss *
493 wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
494 struct wpa_scan_res *res, struct os_time *fetch_time)
498 changes = wpa_bss_compare_res(bss, res);
499 bss->scan_miss_count = 0;
500 bss->last_update_idx = wpa_s->bss_update_idx;
501 wpa_bss_copy_res(bss, res, fetch_time);
502 /* Move the entry to the end of the list */
503 dl_list_del(&bss->list);
504 if (bss->ie_len + bss->beacon_ie_len >=
505 res->ie_len + res->beacon_ie_len) {
506 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
507 bss->ie_len = res->ie_len;
508 bss->beacon_ie_len = res->beacon_ie_len;
510 struct wpa_bss *nbss;
511 struct dl_list *prev = bss->list_id.prev;
512 dl_list_del(&bss->list_id);
513 nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
517 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
518 if (wpa_s->last_scan_res[i] == bss) {
519 wpa_s->last_scan_res[i] = nbss;
523 if (wpa_s->current_bss == bss)
524 wpa_s->current_bss = nbss;
526 os_memcpy(bss + 1, res + 1,
527 res->ie_len + res->beacon_ie_len);
528 bss->ie_len = res->ie_len;
529 bss->beacon_ie_len = res->beacon_ie_len;
531 dl_list_add(prev, &bss->list_id);
533 if (changes & WPA_BSS_IES_CHANGED_FLAG)
534 wpa_bss_set_hessid(bss);
535 dl_list_add_tail(&wpa_s->bss, &bss->list);
537 notify_bss_changes(wpa_s, changes, bss);
544 * wpa_bss_update_start - Start a BSS table update from scan results
545 * @wpa_s: Pointer to wpa_supplicant data
547 * This function is called at the start of each BSS table update round for new
548 * scan results. The actual scan result entries are indicated with calls to
549 * wpa_bss_update_scan_res() and the update round is finished with a call to
550 * wpa_bss_update_end().
552 void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
554 wpa_s->bss_update_idx++;
555 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
556 wpa_s->bss_update_idx);
557 wpa_s->last_scan_res_used = 0;
562 * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
563 * @wpa_s: Pointer to wpa_supplicant data
565 * @fetch_time: Time when the result was fetched from the driver
567 * This function updates a BSS table entry (or adds one) based on a scan result.
568 * This is called separately for each scan result between the calls to
569 * wpa_bss_update_start() and wpa_bss_update_end().
571 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
572 struct wpa_scan_res *res,
573 struct os_time *fetch_time)
575 const u8 *ssid, *p2p;
578 if (wpa_s->conf->ignore_old_scan_res) {
579 struct os_time update;
580 calculate_update_time(fetch_time, res->age, &update);
581 if (os_time_before(&update, &wpa_s->scan_trigger_time)) {
583 os_time_sub(&wpa_s->scan_trigger_time, &update, &age);
584 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS "
585 "table entry that is %u.%06u seconds older "
586 "than our scan trigger",
587 (unsigned int) age.sec,
588 (unsigned int) age.usec);
593 ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
595 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
596 MACSTR, MAC2STR(res->bssid));
600 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
601 MACSTR, MAC2STR(res->bssid));
605 p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
608 wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
610 * If it's a P2P specific interface, then don't update
611 * the scan result without a P2P IE.
613 wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
614 " update for P2P interface", MAC2STR(res->bssid));
617 #endif /* CONFIG_P2P */
618 if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
619 os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
620 return; /* Skip P2P listen discovery results here */
622 /* TODO: add option for ignoring BSSes we are not interested in
623 * (to save memory) */
624 bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
626 bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time);
628 bss = wpa_bss_update(wpa_s, bss, res, fetch_time);
632 if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
635 if (wpa_s->last_scan_res_size == 0)
638 siz = wpa_s->last_scan_res_size * 2;
639 n = os_realloc_array(wpa_s->last_scan_res, siz,
640 sizeof(struct wpa_bss *));
643 wpa_s->last_scan_res = n;
644 wpa_s->last_scan_res_size = siz;
647 wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
651 static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
652 const struct scan_info *info)
660 if (info->num_freqs) {
662 for (i = 0; i < info->num_freqs; i++) {
663 if (bss->freq == info->freqs[i]) {
672 if (info->num_ssids) {
674 for (i = 0; i < info->num_ssids; i++) {
675 const struct wpa_driver_scan_ssid *s = &info->ssids[i];
676 if ((s->ssid == NULL || s->ssid_len == 0) ||
677 (s->ssid_len == bss->ssid_len &&
678 os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
693 * wpa_bss_update_end - End a BSS table update from scan results
694 * @wpa_s: Pointer to wpa_supplicant data
695 * @info: Information about scan parameters
696 * @new_scan: Whether this update round was based on a new scan
698 * This function is called at the end of each BSS table update round for new
699 * scan results. The start of the update was indicated with a call to
700 * wpa_bss_update_start().
702 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
705 struct wpa_bss *bss, *n;
707 wpa_s->last_scan_full = 0;
708 os_get_time(&wpa_s->last_scan);
710 return; /* do not expire entries without new scan */
712 if (info && !info->aborted && !info->freqs) {
714 if (info->num_ssids == 0) {
715 wpa_s->last_scan_full = 1;
717 for (i = 0; i < info->num_ssids; i++) {
718 if (info->ssids[i].ssid == NULL ||
719 info->ssids[i].ssid_len == 0) {
720 wpa_s->last_scan_full = 1;
727 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
728 if (wpa_bss_in_use(wpa_s, bss))
730 if (!wpa_bss_included_in_scan(bss, info))
731 continue; /* expire only BSSes that were scanned */
732 if (bss->last_update_idx < wpa_s->bss_update_idx)
733 bss->scan_miss_count++;
734 if (bss->scan_miss_count >=
735 wpa_s->conf->bss_expiration_scan_count) {
736 wpa_bss_remove(wpa_s, bss, "no match in scan");
740 wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u "
742 wpa_s->last_scan_res_used, wpa_s->last_scan_res_size,
743 wpa_s->last_scan_full);
748 * wpa_bss_flush_by_age - Flush old BSS entries
749 * @wpa_s: Pointer to wpa_supplicant data
750 * @age: Maximum entry age in seconds
752 * Remove BSS entries that have not been updated during the last @age seconds.
754 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
756 struct wpa_bss *bss, *n;
759 if (dl_list_empty(&wpa_s->bss))
765 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
766 if (wpa_bss_in_use(wpa_s, bss))
769 if (os_time_before(&bss->last_update, &t)) {
770 wpa_bss_remove(wpa_s, bss, __func__);
777 static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
779 struct wpa_supplicant *wpa_s = eloop_ctx;
781 wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
782 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
783 wpa_bss_timeout, wpa_s, NULL);
788 * wpa_bss_init - Initialize BSS table
789 * @wpa_s: Pointer to wpa_supplicant data
790 * Returns: 0 on success, -1 on failure
792 * This prepares BSS table lists and timer for periodic updates. The BSS table
793 * is deinitialized with wpa_bss_deinit() once not needed anymore.
795 int wpa_bss_init(struct wpa_supplicant *wpa_s)
797 dl_list_init(&wpa_s->bss);
798 dl_list_init(&wpa_s->bss_id);
799 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
800 wpa_bss_timeout, wpa_s, NULL);
806 * wpa_bss_flush - Flush all unused BSS entries
807 * @wpa_s: Pointer to wpa_supplicant data
809 void wpa_bss_flush(struct wpa_supplicant *wpa_s)
811 struct wpa_bss *bss, *n;
813 if (wpa_s->bss.next == NULL)
814 return; /* BSS table not yet initialized */
816 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
817 if (wpa_bss_in_use(wpa_s, bss))
819 wpa_bss_remove(wpa_s, bss, __func__);
825 * wpa_bss_deinit - Deinitialize BSS table
826 * @wpa_s: Pointer to wpa_supplicant data
828 void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
830 eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
831 wpa_bss_flush(wpa_s);
836 * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
837 * @wpa_s: Pointer to wpa_supplicant data
839 * Returns: Pointer to the BSS entry or %NULL if not found
841 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
845 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
847 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
848 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
856 * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
857 * @wpa_s: Pointer to wpa_supplicant data
859 * Returns: Pointer to the BSS entry or %NULL if not found
861 * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to
862 * find the entry that has the most recent update. This can help in finding the
863 * correct entry in cases where the SSID of the AP may have changed recently
864 * (e.g., in WPS reconfiguration cases).
866 struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
869 struct wpa_bss *bss, *found = NULL;
870 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
872 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
873 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0)
876 os_time_before(&found->last_update, &bss->last_update))
885 * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr
886 * @wpa_s: Pointer to wpa_supplicant data
887 * @dev_addr: P2P Device Address of the GO
888 * Returns: Pointer to the BSS entry or %NULL if not found
890 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
894 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
896 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
898 os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
903 #endif /* CONFIG_P2P */
907 * wpa_bss_get_id - Fetch a BSS table entry based on identifier
908 * @wpa_s: Pointer to wpa_supplicant data
909 * @id: Unique identifier (struct wpa_bss::id) assigned for the entry
910 * Returns: Pointer to the BSS entry or %NULL if not found
912 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
915 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
924 * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range
925 * @wpa_s: Pointer to wpa_supplicant data
926 * @idf: Smallest allowed identifier assigned for the entry
927 * @idf: Largest allowed identifier assigned for the entry
928 * Returns: Pointer to the BSS entry or %NULL if not found
930 * This function is similar to wpa_bss_get_id() but allows a BSS entry with the
931 * smallest id value to be fetched within the specified range without the
932 * caller having to know the exact id.
934 struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
935 unsigned int idf, unsigned int idl)
938 dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) {
939 if (bss->id >= idf && bss->id <= idl)
947 * wpa_bss_get_ie - Fetch a specified information element from a BSS entry
948 * @bss: BSS table entry
949 * @ie: Information element identitifier (WLAN_EID_*)
950 * Returns: Pointer to the information element (id field) or %NULL if not found
952 * This function returns the first matching information element in the BSS
955 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
959 pos = (const u8 *) (bss + 1);
960 end = pos + bss->ie_len;
962 while (pos + 1 < end) {
963 if (pos + 2 + pos[1] > end)
975 * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry
976 * @bss: BSS table entry
977 * @vendor_type: Vendor type (four octets starting the IE payload)
978 * Returns: Pointer to the information element (id field) or %NULL if not found
980 * This function returns the first matching information element in the BSS
983 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
987 pos = (const u8 *) (bss + 1);
988 end = pos + bss->ie_len;
990 while (pos + 1 < end) {
991 if (pos + 2 + pos[1] > end)
993 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
994 vendor_type == WPA_GET_BE32(&pos[2]))
1004 * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
1005 * @bss: BSS table entry
1006 * @vendor_type: Vendor type (four octets starting the IE payload)
1007 * Returns: Pointer to the information element payload or %NULL if not found
1009 * This function returns concatenated payload of possibly fragmented vendor
1010 * specific information elements in the BSS entry. The caller is responsible for
1011 * freeing the returned buffer.
1013 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
1017 const u8 *end, *pos;
1019 buf = wpabuf_alloc(bss->ie_len);
1023 pos = (const u8 *) (bss + 1);
1024 end = pos + bss->ie_len;
1026 while (pos + 1 < end) {
1027 if (pos + 2 + pos[1] > end)
1029 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1030 vendor_type == WPA_GET_BE32(&pos[2]))
1031 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1035 if (wpabuf_len(buf) == 0) {
1045 * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry
1046 * @bss: BSS table entry
1047 * @vendor_type: Vendor type (four octets starting the IE payload)
1048 * Returns: Pointer to the information element payload or %NULL if not found
1050 * This function returns concatenated payload of possibly fragmented vendor
1051 * specific information elements in the BSS entry. The caller is responsible for
1052 * freeing the returned buffer.
1054 * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only
1055 * from Beacon frames instead of either Beacon or Probe Response frames.
1057 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
1061 const u8 *end, *pos;
1063 buf = wpabuf_alloc(bss->beacon_ie_len);
1067 pos = (const u8 *) (bss + 1);
1069 end = pos + bss->beacon_ie_len;
1071 while (pos + 1 < end) {
1072 if (pos + 2 + pos[1] > end)
1074 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1075 vendor_type == WPA_GET_BE32(&pos[2]))
1076 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1080 if (wpabuf_len(buf) == 0) {
1090 * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS
1091 * @bss: BSS table entry
1092 * Returns: Maximum legacy rate in units of 500 kbps
1094 int wpa_bss_get_max_rate(const struct wpa_bss *bss)
1100 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1101 for (i = 0; ie && i < ie[1]; i++) {
1102 if ((ie[i + 2] & 0x7f) > rate)
1103 rate = ie[i + 2] & 0x7f;
1106 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1107 for (i = 0; ie && i < ie[1]; i++) {
1108 if ((ie[i + 2] & 0x7f) > rate)
1109 rate = ie[i + 2] & 0x7f;
1117 * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS
1118 * @bss: BSS table entry
1119 * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps)
1120 * Returns: number of legacy TX rates or -1 on failure
1122 * The caller is responsible for freeing the returned buffer with os_free() in
1125 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
1132 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1133 ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1135 len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
1141 for (i = 0; ie && i < ie[1]; i++)
1142 r[i] = ie[i + 2] & 0x7f;
1144 for (j = 0; ie2 && j < ie2[1]; j++)
1145 r[i + j] = ie2[j + 2] & 0x7f;