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 if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count &&
347 wpa_bss_remove_oldest(wpa_s) != 0) {
348 wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
349 "because all BSSes are in use. We should normally "
350 "not get here!", (int) wpa_s->num_bss + 1);
351 wpa_s->conf->bss_max_count = wpa_s->num_bss + 1;
354 dl_list_add_tail(&wpa_s->bss, &bss->list);
355 dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
357 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
359 bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
360 wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
365 static int are_ies_equal(const struct wpa_bss *old,
366 const struct wpa_scan_res *new, u32 ie)
368 const u8 *old_ie, *new_ie;
369 struct wpabuf *old_ie_buff = NULL;
370 struct wpabuf *new_ie_buff = NULL;
371 int new_ie_len, old_ie_len, ret, is_multi;
374 case WPA_IE_VENDOR_TYPE:
375 old_ie = wpa_bss_get_vendor_ie(old, ie);
376 new_ie = wpa_scan_get_vendor_ie(new, ie);
379 case WPS_IE_VENDOR_TYPE:
380 old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
381 new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie);
385 case WLAN_EID_SUPP_RATES:
386 case WLAN_EID_EXT_SUPP_RATES:
387 old_ie = wpa_bss_get_ie(old, ie);
388 new_ie = wpa_scan_get_ie(new, ie);
392 wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
397 /* in case of multiple IEs stored in buffer */
398 old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
399 new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
400 old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
401 new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
403 /* in case of single IE */
404 old_ie_len = old_ie ? old_ie[1] + 2 : 0;
405 new_ie_len = new_ie ? new_ie[1] + 2 : 0;
408 if (!old_ie || !new_ie)
409 ret = !old_ie && !new_ie;
411 ret = (old_ie_len == new_ie_len &&
412 os_memcmp(old_ie, new_ie, old_ie_len) == 0);
414 wpabuf_free(old_ie_buff);
415 wpabuf_free(new_ie_buff);
421 static u32 wpa_bss_compare_res(const struct wpa_bss *old,
422 const struct wpa_scan_res *new)
425 int caps_diff = old->caps ^ new->caps;
427 if (old->freq != new->freq)
428 changes |= WPA_BSS_FREQ_CHANGED_FLAG;
430 if (old->level != new->level)
431 changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
433 if (caps_diff & IEEE80211_CAP_PRIVACY)
434 changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
436 if (caps_diff & IEEE80211_CAP_IBSS)
437 changes |= WPA_BSS_MODE_CHANGED_FLAG;
439 if (old->ie_len == new->ie_len &&
440 os_memcmp(old + 1, new + 1, old->ie_len) == 0)
442 changes |= WPA_BSS_IES_CHANGED_FLAG;
444 if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
445 changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
447 if (!are_ies_equal(old, new, WLAN_EID_RSN))
448 changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
450 if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE))
451 changes |= WPA_BSS_WPS_CHANGED_FLAG;
453 if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) ||
454 !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES))
455 changes |= WPA_BSS_RATES_CHANGED_FLAG;
461 static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
462 const struct wpa_bss *bss)
464 if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
465 wpas_notify_bss_freq_changed(wpa_s, bss->id);
467 if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
468 wpas_notify_bss_signal_changed(wpa_s, bss->id);
470 if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
471 wpas_notify_bss_privacy_changed(wpa_s, bss->id);
473 if (changes & WPA_BSS_MODE_CHANGED_FLAG)
474 wpas_notify_bss_mode_changed(wpa_s, bss->id);
476 if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
477 wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
479 if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
480 wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
482 if (changes & WPA_BSS_WPS_CHANGED_FLAG)
483 wpas_notify_bss_wps_changed(wpa_s, bss->id);
485 if (changes & WPA_BSS_IES_CHANGED_FLAG)
486 wpas_notify_bss_ies_changed(wpa_s, bss->id);
488 if (changes & WPA_BSS_RATES_CHANGED_FLAG)
489 wpas_notify_bss_rates_changed(wpa_s, bss->id);
493 static struct wpa_bss *
494 wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
495 struct wpa_scan_res *res, struct os_time *fetch_time)
499 changes = wpa_bss_compare_res(bss, res);
500 bss->scan_miss_count = 0;
501 bss->last_update_idx = wpa_s->bss_update_idx;
502 wpa_bss_copy_res(bss, res, fetch_time);
503 /* Move the entry to the end of the list */
504 dl_list_del(&bss->list);
506 if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) &&
507 !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) {
509 * This can happen when non-P2P station interface runs a scan
510 * without P2P IE in the Probe Request frame. P2P GO would reply
511 * to that with a Probe Response that does not include P2P IE.
512 * Do not update the IEs in this BSS entry to avoid such loss of
513 * information that may be needed for P2P operations to
514 * determine group information.
516 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for "
517 MACSTR " since that would remove P2P IE information",
518 MAC2STR(bss->bssid));
520 #endif /* CONFIG_P2P */
521 if (bss->ie_len + bss->beacon_ie_len >=
522 res->ie_len + res->beacon_ie_len) {
523 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
524 bss->ie_len = res->ie_len;
525 bss->beacon_ie_len = res->beacon_ie_len;
527 struct wpa_bss *nbss;
528 struct dl_list *prev = bss->list_id.prev;
529 dl_list_del(&bss->list_id);
530 nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
534 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
535 if (wpa_s->last_scan_res[i] == bss) {
536 wpa_s->last_scan_res[i] = nbss;
540 if (wpa_s->current_bss == bss)
541 wpa_s->current_bss = nbss;
543 os_memcpy(bss + 1, res + 1,
544 res->ie_len + res->beacon_ie_len);
545 bss->ie_len = res->ie_len;
546 bss->beacon_ie_len = res->beacon_ie_len;
548 dl_list_add(prev, &bss->list_id);
550 if (changes & WPA_BSS_IES_CHANGED_FLAG)
551 wpa_bss_set_hessid(bss);
552 dl_list_add_tail(&wpa_s->bss, &bss->list);
554 notify_bss_changes(wpa_s, changes, bss);
561 * wpa_bss_update_start - Start a BSS table update from scan results
562 * @wpa_s: Pointer to wpa_supplicant data
564 * This function is called at the start of each BSS table update round for new
565 * scan results. The actual scan result entries are indicated with calls to
566 * wpa_bss_update_scan_res() and the update round is finished with a call to
567 * wpa_bss_update_end().
569 void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
571 wpa_s->bss_update_idx++;
572 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
573 wpa_s->bss_update_idx);
574 wpa_s->last_scan_res_used = 0;
579 * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
580 * @wpa_s: Pointer to wpa_supplicant data
582 * @fetch_time: Time when the result was fetched from the driver
584 * This function updates a BSS table entry (or adds one) based on a scan result.
585 * This is called separately for each scan result between the calls to
586 * wpa_bss_update_start() and wpa_bss_update_end().
588 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
589 struct wpa_scan_res *res,
590 struct os_time *fetch_time)
592 const u8 *ssid, *p2p;
595 if (wpa_s->conf->ignore_old_scan_res) {
596 struct os_time update;
597 calculate_update_time(fetch_time, res->age, &update);
598 if (os_time_before(&update, &wpa_s->scan_trigger_time)) {
600 os_time_sub(&wpa_s->scan_trigger_time, &update, &age);
601 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS "
602 "table entry that is %u.%06u seconds older "
603 "than our scan trigger",
604 (unsigned int) age.sec,
605 (unsigned int) age.usec);
610 ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
612 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
613 MACSTR, MAC2STR(res->bssid));
617 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
618 MACSTR, MAC2STR(res->bssid));
622 p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
625 wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
627 * If it's a P2P specific interface, then don't update
628 * the scan result without a P2P IE.
630 wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
631 " update for P2P interface", MAC2STR(res->bssid));
634 #endif /* CONFIG_P2P */
635 if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
636 os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
637 return; /* Skip P2P listen discovery results here */
639 /* TODO: add option for ignoring BSSes we are not interested in
640 * (to save memory) */
641 bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
643 bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time);
645 bss = wpa_bss_update(wpa_s, bss, res, fetch_time);
646 if (wpa_s->last_scan_res) {
648 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
649 if (bss == wpa_s->last_scan_res[i]) {
650 /* Already in the list */
659 if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
662 if (wpa_s->last_scan_res_size == 0)
665 siz = wpa_s->last_scan_res_size * 2;
666 n = os_realloc_array(wpa_s->last_scan_res, siz,
667 sizeof(struct wpa_bss *));
670 wpa_s->last_scan_res = n;
671 wpa_s->last_scan_res_size = siz;
674 wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
678 static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
679 const struct scan_info *info)
687 if (info->num_freqs) {
689 for (i = 0; i < info->num_freqs; i++) {
690 if (bss->freq == info->freqs[i]) {
699 if (info->num_ssids) {
701 for (i = 0; i < info->num_ssids; i++) {
702 const struct wpa_driver_scan_ssid *s = &info->ssids[i];
703 if ((s->ssid == NULL || s->ssid_len == 0) ||
704 (s->ssid_len == bss->ssid_len &&
705 os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
720 * wpa_bss_update_end - End a BSS table update from scan results
721 * @wpa_s: Pointer to wpa_supplicant data
722 * @info: Information about scan parameters
723 * @new_scan: Whether this update round was based on a new scan
725 * This function is called at the end of each BSS table update round for new
726 * scan results. The start of the update was indicated with a call to
727 * wpa_bss_update_start().
729 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
732 struct wpa_bss *bss, *n;
734 wpa_s->last_scan_full = 0;
735 os_get_time(&wpa_s->last_scan);
737 return; /* do not expire entries without new scan */
739 if (info && !info->aborted && !info->freqs) {
741 if (info->num_ssids == 0) {
742 wpa_s->last_scan_full = 1;
744 for (i = 0; i < info->num_ssids; i++) {
745 if (info->ssids[i].ssid == NULL ||
746 info->ssids[i].ssid_len == 0) {
747 wpa_s->last_scan_full = 1;
754 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
755 if (wpa_bss_in_use(wpa_s, bss))
757 if (!wpa_bss_included_in_scan(bss, info))
758 continue; /* expire only BSSes that were scanned */
759 if (bss->last_update_idx < wpa_s->bss_update_idx)
760 bss->scan_miss_count++;
761 if (bss->scan_miss_count >=
762 wpa_s->conf->bss_expiration_scan_count) {
763 wpa_bss_remove(wpa_s, bss, "no match in scan");
767 wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u "
769 wpa_s->last_scan_res_used, wpa_s->last_scan_res_size,
770 wpa_s->last_scan_full);
775 * wpa_bss_flush_by_age - Flush old BSS entries
776 * @wpa_s: Pointer to wpa_supplicant data
777 * @age: Maximum entry age in seconds
779 * Remove BSS entries that have not been updated during the last @age seconds.
781 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
783 struct wpa_bss *bss, *n;
786 if (dl_list_empty(&wpa_s->bss))
792 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
793 if (wpa_bss_in_use(wpa_s, bss))
796 if (os_time_before(&bss->last_update, &t)) {
797 wpa_bss_remove(wpa_s, bss, __func__);
804 static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
806 struct wpa_supplicant *wpa_s = eloop_ctx;
808 wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
809 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
810 wpa_bss_timeout, wpa_s, NULL);
815 * wpa_bss_init - Initialize BSS table
816 * @wpa_s: Pointer to wpa_supplicant data
817 * Returns: 0 on success, -1 on failure
819 * This prepares BSS table lists and timer for periodic updates. The BSS table
820 * is deinitialized with wpa_bss_deinit() once not needed anymore.
822 int wpa_bss_init(struct wpa_supplicant *wpa_s)
824 dl_list_init(&wpa_s->bss);
825 dl_list_init(&wpa_s->bss_id);
826 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
827 wpa_bss_timeout, wpa_s, NULL);
833 * wpa_bss_flush - Flush all unused BSS entries
834 * @wpa_s: Pointer to wpa_supplicant data
836 void wpa_bss_flush(struct wpa_supplicant *wpa_s)
838 struct wpa_bss *bss, *n;
840 if (wpa_s->bss.next == NULL)
841 return; /* BSS table not yet initialized */
843 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
844 if (wpa_bss_in_use(wpa_s, bss))
846 wpa_bss_remove(wpa_s, bss, __func__);
852 * wpa_bss_deinit - Deinitialize BSS table
853 * @wpa_s: Pointer to wpa_supplicant data
855 void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
857 eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
858 wpa_bss_flush(wpa_s);
863 * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
864 * @wpa_s: Pointer to wpa_supplicant data
866 * Returns: Pointer to the BSS entry or %NULL if not found
868 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
872 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
874 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
875 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
883 * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
884 * @wpa_s: Pointer to wpa_supplicant data
886 * Returns: Pointer to the BSS entry or %NULL if not found
888 * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to
889 * find the entry that has the most recent update. This can help in finding the
890 * correct entry in cases where the SSID of the AP may have changed recently
891 * (e.g., in WPS reconfiguration cases).
893 struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
896 struct wpa_bss *bss, *found = NULL;
897 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
899 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
900 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0)
903 os_time_before(&found->last_update, &bss->last_update))
912 * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr
913 * @wpa_s: Pointer to wpa_supplicant data
914 * @dev_addr: P2P Device Address of the GO
915 * Returns: Pointer to the BSS entry or %NULL if not found
917 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
921 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
923 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
925 os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
930 #endif /* CONFIG_P2P */
934 * wpa_bss_get_id - Fetch a BSS table entry based on identifier
935 * @wpa_s: Pointer to wpa_supplicant data
936 * @id: Unique identifier (struct wpa_bss::id) assigned for the entry
937 * Returns: Pointer to the BSS entry or %NULL if not found
939 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
942 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
951 * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range
952 * @wpa_s: Pointer to wpa_supplicant data
953 * @idf: Smallest allowed identifier assigned for the entry
954 * @idf: Largest allowed identifier assigned for the entry
955 * Returns: Pointer to the BSS entry or %NULL if not found
957 * This function is similar to wpa_bss_get_id() but allows a BSS entry with the
958 * smallest id value to be fetched within the specified range without the
959 * caller having to know the exact id.
961 struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
962 unsigned int idf, unsigned int idl)
965 dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) {
966 if (bss->id >= idf && bss->id <= idl)
974 * wpa_bss_get_ie - Fetch a specified information element from a BSS entry
975 * @bss: BSS table entry
976 * @ie: Information element identitifier (WLAN_EID_*)
977 * Returns: Pointer to the information element (id field) or %NULL if not found
979 * This function returns the first matching information element in the BSS
982 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
986 pos = (const u8 *) (bss + 1);
987 end = pos + bss->ie_len;
989 while (pos + 1 < end) {
990 if (pos + 2 + pos[1] > end)
1002 * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry
1003 * @bss: BSS table entry
1004 * @vendor_type: Vendor type (four octets starting the IE payload)
1005 * Returns: Pointer to the information element (id field) or %NULL if not found
1007 * This function returns the first matching information element in the BSS
1010 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
1012 const u8 *end, *pos;
1014 pos = (const u8 *) (bss + 1);
1015 end = pos + bss->ie_len;
1017 while (pos + 1 < end) {
1018 if (pos + 2 + pos[1] > end)
1020 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1021 vendor_type == WPA_GET_BE32(&pos[2]))
1031 * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry
1032 * @bss: BSS table entry
1033 * @vendor_type: Vendor type (four octets starting the IE payload)
1034 * Returns: Pointer to the information element (id field) or %NULL if not found
1036 * This function returns the first matching information element in the BSS
1039 * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only
1040 * from Beacon frames instead of either Beacon or Probe Response frames.
1042 const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
1045 const u8 *end, *pos;
1047 if (bss->beacon_ie_len == 0)
1050 pos = (const u8 *) (bss + 1);
1052 end = pos + bss->beacon_ie_len;
1054 while (pos + 1 < end) {
1055 if (pos + 2 + pos[1] > end)
1057 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1058 vendor_type == WPA_GET_BE32(&pos[2]))
1068 * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
1069 * @bss: BSS table entry
1070 * @vendor_type: Vendor type (four octets starting the IE payload)
1071 * Returns: Pointer to the information element payload or %NULL if not found
1073 * This function returns concatenated payload of possibly fragmented vendor
1074 * specific information elements in the BSS entry. The caller is responsible for
1075 * freeing the returned buffer.
1077 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
1081 const u8 *end, *pos;
1083 buf = wpabuf_alloc(bss->ie_len);
1087 pos = (const u8 *) (bss + 1);
1088 end = pos + bss->ie_len;
1090 while (pos + 1 < end) {
1091 if (pos + 2 + pos[1] > end)
1093 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1094 vendor_type == WPA_GET_BE32(&pos[2]))
1095 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1099 if (wpabuf_len(buf) == 0) {
1109 * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry
1110 * @bss: BSS table entry
1111 * @vendor_type: Vendor type (four octets starting the IE payload)
1112 * Returns: Pointer to the information element payload or %NULL if not found
1114 * This function returns concatenated payload of possibly fragmented vendor
1115 * specific information elements in the BSS entry. The caller is responsible for
1116 * freeing the returned buffer.
1118 * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only
1119 * from Beacon frames instead of either Beacon or Probe Response frames.
1121 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
1125 const u8 *end, *pos;
1127 buf = wpabuf_alloc(bss->beacon_ie_len);
1131 pos = (const u8 *) (bss + 1);
1133 end = pos + bss->beacon_ie_len;
1135 while (pos + 1 < end) {
1136 if (pos + 2 + pos[1] > end)
1138 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1139 vendor_type == WPA_GET_BE32(&pos[2]))
1140 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1144 if (wpabuf_len(buf) == 0) {
1154 * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS
1155 * @bss: BSS table entry
1156 * Returns: Maximum legacy rate in units of 500 kbps
1158 int wpa_bss_get_max_rate(const struct wpa_bss *bss)
1164 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1165 for (i = 0; ie && i < ie[1]; i++) {
1166 if ((ie[i + 2] & 0x7f) > rate)
1167 rate = ie[i + 2] & 0x7f;
1170 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1171 for (i = 0; ie && i < ie[1]; i++) {
1172 if ((ie[i + 2] & 0x7f) > rate)
1173 rate = ie[i + 2] & 0x7f;
1181 * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS
1182 * @bss: BSS table entry
1183 * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps)
1184 * Returns: number of legacy TX rates or -1 on failure
1186 * The caller is responsible for freeing the returned buffer with os_free() in
1189 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
1196 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1197 ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1199 len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
1205 for (i = 0; ie && i < ie[1]; i++)
1206 r[i] = ie[i + 2] & 0x7f;
1208 for (j = 0; ie2 && j < ie2[1]; j++)
1209 r[i + j] = ie2[j + 2] & 0x7f;