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 (!is_zero_ether_addr(bss->bssid) &&
310 (os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
311 os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0));
315 static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
319 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
320 if (!wpa_bss_known(wpa_s, bss)) {
321 wpa_bss_remove(wpa_s, bss, __func__);
330 static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
335 * Remove the oldest entry that does not match with any configured
338 if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
342 * Remove the oldest entry that isn't currently in use.
344 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
345 if (!wpa_bss_in_use(wpa_s, bss)) {
346 wpa_bss_remove(wpa_s, bss, __func__);
355 static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
356 const u8 *ssid, size_t ssid_len,
357 struct wpa_scan_res *res,
358 struct os_reltime *fetch_time)
362 bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
365 bss->id = wpa_s->bss_next_id++;
366 bss->last_update_idx = wpa_s->bss_update_idx;
367 wpa_bss_copy_res(bss, res, fetch_time);
368 os_memcpy(bss->ssid, ssid, ssid_len);
369 bss->ssid_len = ssid_len;
370 bss->ie_len = res->ie_len;
371 bss->beacon_ie_len = res->beacon_ie_len;
372 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
373 wpa_bss_set_hessid(bss);
375 if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count &&
376 wpa_bss_remove_oldest(wpa_s) != 0) {
377 wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
378 "because all BSSes are in use. We should normally "
379 "not get here!", (int) wpa_s->num_bss + 1);
380 wpa_s->conf->bss_max_count = wpa_s->num_bss + 1;
383 dl_list_add_tail(&wpa_s->bss, &bss->list);
384 dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
386 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
388 bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
389 wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
394 static int are_ies_equal(const struct wpa_bss *old,
395 const struct wpa_scan_res *new, u32 ie)
397 const u8 *old_ie, *new_ie;
398 struct wpabuf *old_ie_buff = NULL;
399 struct wpabuf *new_ie_buff = NULL;
400 int new_ie_len, old_ie_len, ret, is_multi;
403 case WPA_IE_VENDOR_TYPE:
404 old_ie = wpa_bss_get_vendor_ie(old, ie);
405 new_ie = wpa_scan_get_vendor_ie(new, ie);
408 case WPS_IE_VENDOR_TYPE:
409 old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
410 new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie);
414 case WLAN_EID_SUPP_RATES:
415 case WLAN_EID_EXT_SUPP_RATES:
416 old_ie = wpa_bss_get_ie(old, ie);
417 new_ie = wpa_scan_get_ie(new, ie);
421 wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
426 /* in case of multiple IEs stored in buffer */
427 old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
428 new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
429 old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
430 new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
432 /* in case of single IE */
433 old_ie_len = old_ie ? old_ie[1] + 2 : 0;
434 new_ie_len = new_ie ? new_ie[1] + 2 : 0;
437 if (!old_ie || !new_ie)
438 ret = !old_ie && !new_ie;
440 ret = (old_ie_len == new_ie_len &&
441 os_memcmp(old_ie, new_ie, old_ie_len) == 0);
443 wpabuf_free(old_ie_buff);
444 wpabuf_free(new_ie_buff);
450 static u32 wpa_bss_compare_res(const struct wpa_bss *old,
451 const struct wpa_scan_res *new)
454 int caps_diff = old->caps ^ new->caps;
456 if (old->freq != new->freq)
457 changes |= WPA_BSS_FREQ_CHANGED_FLAG;
459 if (old->level != new->level)
460 changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
462 if (caps_diff & IEEE80211_CAP_PRIVACY)
463 changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
465 if (caps_diff & IEEE80211_CAP_IBSS)
466 changes |= WPA_BSS_MODE_CHANGED_FLAG;
468 if (old->ie_len == new->ie_len &&
469 os_memcmp(old + 1, new + 1, old->ie_len) == 0)
471 changes |= WPA_BSS_IES_CHANGED_FLAG;
473 if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
474 changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
476 if (!are_ies_equal(old, new, WLAN_EID_RSN))
477 changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
479 if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE))
480 changes |= WPA_BSS_WPS_CHANGED_FLAG;
482 if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) ||
483 !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES))
484 changes |= WPA_BSS_RATES_CHANGED_FLAG;
490 static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
491 const struct wpa_bss *bss)
493 if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
494 wpas_notify_bss_freq_changed(wpa_s, bss->id);
496 if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
497 wpas_notify_bss_signal_changed(wpa_s, bss->id);
499 if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
500 wpas_notify_bss_privacy_changed(wpa_s, bss->id);
502 if (changes & WPA_BSS_MODE_CHANGED_FLAG)
503 wpas_notify_bss_mode_changed(wpa_s, bss->id);
505 if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
506 wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
508 if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
509 wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
511 if (changes & WPA_BSS_WPS_CHANGED_FLAG)
512 wpas_notify_bss_wps_changed(wpa_s, bss->id);
514 if (changes & WPA_BSS_IES_CHANGED_FLAG)
515 wpas_notify_bss_ies_changed(wpa_s, bss->id);
517 if (changes & WPA_BSS_RATES_CHANGED_FLAG)
518 wpas_notify_bss_rates_changed(wpa_s, bss->id);
520 wpas_notify_bss_seen(wpa_s, bss->id);
524 static struct wpa_bss *
525 wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
526 struct wpa_scan_res *res, struct os_reltime *fetch_time)
530 changes = wpa_bss_compare_res(bss, res);
531 bss->scan_miss_count = 0;
532 bss->last_update_idx = wpa_s->bss_update_idx;
533 wpa_bss_copy_res(bss, res, fetch_time);
534 /* Move the entry to the end of the list */
535 dl_list_del(&bss->list);
537 if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) &&
538 !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) {
540 * This can happen when non-P2P station interface runs a scan
541 * without P2P IE in the Probe Request frame. P2P GO would reply
542 * to that with a Probe Response that does not include P2P IE.
543 * Do not update the IEs in this BSS entry to avoid such loss of
544 * information that may be needed for P2P operations to
545 * determine group information.
547 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for "
548 MACSTR " since that would remove P2P IE information",
549 MAC2STR(bss->bssid));
551 #endif /* CONFIG_P2P */
552 if (bss->ie_len + bss->beacon_ie_len >=
553 res->ie_len + res->beacon_ie_len) {
554 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
555 bss->ie_len = res->ie_len;
556 bss->beacon_ie_len = res->beacon_ie_len;
558 struct wpa_bss *nbss;
559 struct dl_list *prev = bss->list_id.prev;
560 dl_list_del(&bss->list_id);
561 nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
565 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
566 if (wpa_s->last_scan_res[i] == bss) {
567 wpa_s->last_scan_res[i] = nbss;
571 if (wpa_s->current_bss == bss)
572 wpa_s->current_bss = nbss;
573 wpa_bss_update_pending_connect(wpa_s, bss, nbss);
575 os_memcpy(bss + 1, res + 1,
576 res->ie_len + res->beacon_ie_len);
577 bss->ie_len = res->ie_len;
578 bss->beacon_ie_len = res->beacon_ie_len;
580 dl_list_add(prev, &bss->list_id);
582 if (changes & WPA_BSS_IES_CHANGED_FLAG)
583 wpa_bss_set_hessid(bss);
584 dl_list_add_tail(&wpa_s->bss, &bss->list);
586 notify_bss_changes(wpa_s, changes, bss);
593 * wpa_bss_update_start - Start a BSS table update from scan results
594 * @wpa_s: Pointer to wpa_supplicant data
596 * This function is called at the start of each BSS table update round for new
597 * scan results. The actual scan result entries are indicated with calls to
598 * wpa_bss_update_scan_res() and the update round is finished with a call to
599 * wpa_bss_update_end().
601 void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
603 wpa_s->bss_update_idx++;
604 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
605 wpa_s->bss_update_idx);
606 wpa_s->last_scan_res_used = 0;
611 * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
612 * @wpa_s: Pointer to wpa_supplicant data
614 * @fetch_time: Time when the result was fetched from the driver
616 * This function updates a BSS table entry (or adds one) based on a scan result.
617 * This is called separately for each scan result between the calls to
618 * wpa_bss_update_start() and wpa_bss_update_end().
620 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
621 struct wpa_scan_res *res,
622 struct os_reltime *fetch_time)
624 const u8 *ssid, *p2p, *mesh;
627 if (wpa_s->conf->ignore_old_scan_res) {
628 struct os_reltime update;
629 calculate_update_time(fetch_time, res->age, &update);
630 if (os_reltime_before(&update, &wpa_s->scan_trigger_time)) {
631 struct os_reltime age;
632 os_reltime_sub(&wpa_s->scan_trigger_time, &update,
634 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS "
635 "table entry that is %u.%06u seconds older "
636 "than our scan trigger",
637 (unsigned int) age.sec,
638 (unsigned int) age.usec);
643 ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
645 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
646 MACSTR, MAC2STR(res->bssid));
650 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
651 MACSTR, MAC2STR(res->bssid));
655 p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
658 wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
660 * If it's a P2P specific interface, then don't update
661 * the scan result without a P2P IE.
663 wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
664 " update for P2P interface", MAC2STR(res->bssid));
667 #endif /* CONFIG_P2P */
668 if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
669 os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
670 return; /* Skip P2P listen discovery results here */
672 /* TODO: add option for ignoring BSSes we are not interested in
673 * (to save memory) */
675 mesh = wpa_scan_get_ie(res, WLAN_EID_MESH_ID);
676 if (mesh && mesh[1] <= 32)
679 bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
681 bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time);
683 bss = wpa_bss_update(wpa_s, bss, res, fetch_time);
684 if (wpa_s->last_scan_res) {
686 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
687 if (bss == wpa_s->last_scan_res[i]) {
688 /* Already in the list */
697 if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
700 if (wpa_s->last_scan_res_size == 0)
703 siz = wpa_s->last_scan_res_size * 2;
704 n = os_realloc_array(wpa_s->last_scan_res, siz,
705 sizeof(struct wpa_bss *));
708 wpa_s->last_scan_res = n;
709 wpa_s->last_scan_res_size = siz;
712 if (wpa_s->last_scan_res)
713 wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
717 static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
718 const struct scan_info *info)
726 if (info->num_freqs) {
728 for (i = 0; i < info->num_freqs; i++) {
729 if (bss->freq == info->freqs[i]) {
738 if (info->num_ssids) {
740 for (i = 0; i < info->num_ssids; i++) {
741 const struct wpa_driver_scan_ssid *s = &info->ssids[i];
742 if ((s->ssid == NULL || s->ssid_len == 0) ||
743 (s->ssid_len == bss->ssid_len &&
744 os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
759 * wpa_bss_update_end - End a BSS table update from scan results
760 * @wpa_s: Pointer to wpa_supplicant data
761 * @info: Information about scan parameters
762 * @new_scan: Whether this update round was based on a new scan
764 * This function is called at the end of each BSS table update round for new
765 * scan results. The start of the update was indicated with a call to
766 * wpa_bss_update_start().
768 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
771 struct wpa_bss *bss, *n;
773 os_get_reltime(&wpa_s->last_scan);
775 return; /* do not expire entries without new scan */
777 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
778 if (wpa_bss_in_use(wpa_s, bss))
780 if (!wpa_bss_included_in_scan(bss, info))
781 continue; /* expire only BSSes that were scanned */
782 if (bss->last_update_idx < wpa_s->bss_update_idx)
783 bss->scan_miss_count++;
784 if (bss->scan_miss_count >=
785 wpa_s->conf->bss_expiration_scan_count) {
786 wpa_bss_remove(wpa_s, bss, "no match in scan");
790 wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u",
791 wpa_s->last_scan_res_used, wpa_s->last_scan_res_size);
796 * wpa_bss_flush_by_age - Flush old BSS entries
797 * @wpa_s: Pointer to wpa_supplicant data
798 * @age: Maximum entry age in seconds
800 * Remove BSS entries that have not been updated during the last @age seconds.
802 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
804 struct wpa_bss *bss, *n;
807 if (dl_list_empty(&wpa_s->bss))
813 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
814 if (wpa_bss_in_use(wpa_s, bss))
817 if (os_reltime_before(&bss->last_update, &t)) {
818 wpa_bss_remove(wpa_s, bss, __func__);
825 static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
827 struct wpa_supplicant *wpa_s = eloop_ctx;
829 wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
830 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
831 wpa_bss_timeout, wpa_s, NULL);
836 * wpa_bss_init - Initialize BSS table
837 * @wpa_s: Pointer to wpa_supplicant data
838 * Returns: 0 on success, -1 on failure
840 * This prepares BSS table lists and timer for periodic updates. The BSS table
841 * is deinitialized with wpa_bss_deinit() once not needed anymore.
843 int wpa_bss_init(struct wpa_supplicant *wpa_s)
845 dl_list_init(&wpa_s->bss);
846 dl_list_init(&wpa_s->bss_id);
847 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
848 wpa_bss_timeout, wpa_s, NULL);
854 * wpa_bss_flush - Flush all unused BSS entries
855 * @wpa_s: Pointer to wpa_supplicant data
857 void wpa_bss_flush(struct wpa_supplicant *wpa_s)
859 struct wpa_bss *bss, *n;
861 wpa_s->clear_driver_scan_cache = 1;
863 if (wpa_s->bss.next == NULL)
864 return; /* BSS table not yet initialized */
866 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
867 if (wpa_bss_in_use(wpa_s, bss))
869 wpa_bss_remove(wpa_s, bss, __func__);
875 * wpa_bss_deinit - Deinitialize BSS table
876 * @wpa_s: Pointer to wpa_supplicant data
878 void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
880 eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
881 wpa_bss_flush(wpa_s);
886 * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
887 * @wpa_s: Pointer to wpa_supplicant data
889 * Returns: Pointer to the BSS entry or %NULL if not found
891 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
895 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
897 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
898 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
906 * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
907 * @wpa_s: Pointer to wpa_supplicant data
909 * Returns: Pointer to the BSS entry or %NULL if not found
911 * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to
912 * find the entry that has the most recent update. This can help in finding the
913 * correct entry in cases where the SSID of the AP may have changed recently
914 * (e.g., in WPS reconfiguration cases).
916 struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
919 struct wpa_bss *bss, *found = NULL;
920 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
922 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
923 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0)
926 os_reltime_before(&found->last_update, &bss->last_update))
935 * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr
936 * @wpa_s: Pointer to wpa_supplicant data
937 * @dev_addr: P2P Device Address of the GO
938 * Returns: Pointer to the BSS entry or %NULL if not found
940 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
944 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
946 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
948 os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
953 #endif /* CONFIG_P2P */
957 * wpa_bss_get_id - Fetch a BSS table entry based on identifier
958 * @wpa_s: Pointer to wpa_supplicant data
959 * @id: Unique identifier (struct wpa_bss::id) assigned for the entry
960 * Returns: Pointer to the BSS entry or %NULL if not found
962 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
965 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
974 * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range
975 * @wpa_s: Pointer to wpa_supplicant data
976 * @idf: Smallest allowed identifier assigned for the entry
977 * @idf: Largest allowed identifier assigned for the entry
978 * Returns: Pointer to the BSS entry or %NULL if not found
980 * This function is similar to wpa_bss_get_id() but allows a BSS entry with the
981 * smallest id value to be fetched within the specified range without the
982 * caller having to know the exact id.
984 struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
985 unsigned int idf, unsigned int idl)
988 dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) {
989 if (bss->id >= idf && bss->id <= idl)
997 * wpa_bss_get_ie - Fetch a specified information element from a BSS entry
998 * @bss: BSS table entry
999 * @ie: Information element identitifier (WLAN_EID_*)
1000 * Returns: Pointer to the information element (id field) or %NULL if not found
1002 * This function returns the first matching information element in the BSS
1005 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
1007 const u8 *end, *pos;
1009 pos = (const u8 *) (bss + 1);
1010 end = pos + bss->ie_len;
1012 while (pos + 1 < end) {
1013 if (pos + 2 + pos[1] > end)
1025 * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry
1026 * @bss: BSS table entry
1027 * @vendor_type: Vendor type (four octets starting the IE payload)
1028 * Returns: Pointer to the information element (id field) or %NULL if not found
1030 * This function returns the first matching information element in the BSS
1033 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
1035 const u8 *end, *pos;
1037 pos = (const u8 *) (bss + 1);
1038 end = pos + bss->ie_len;
1040 while (pos + 1 < end) {
1041 if (pos + 2 + pos[1] > end)
1043 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1044 vendor_type == WPA_GET_BE32(&pos[2]))
1054 * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry
1055 * @bss: BSS table entry
1056 * @vendor_type: Vendor type (four octets starting the IE payload)
1057 * Returns: Pointer to the information element (id field) or %NULL if not found
1059 * This function returns the first matching information element in the BSS
1062 * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only
1063 * from Beacon frames instead of either Beacon or Probe Response frames.
1065 const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
1068 const u8 *end, *pos;
1070 if (bss->beacon_ie_len == 0)
1073 pos = (const u8 *) (bss + 1);
1075 end = pos + bss->beacon_ie_len;
1077 while (pos + 1 < end) {
1078 if (pos + 2 + pos[1] > end)
1080 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1081 vendor_type == WPA_GET_BE32(&pos[2]))
1091 * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
1092 * @bss: BSS table entry
1093 * @vendor_type: Vendor type (four octets starting the IE payload)
1094 * Returns: Pointer to the information element payload or %NULL if not found
1096 * This function returns concatenated payload of possibly fragmented vendor
1097 * specific information elements in the BSS entry. The caller is responsible for
1098 * freeing the returned buffer.
1100 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
1104 const u8 *end, *pos;
1106 buf = wpabuf_alloc(bss->ie_len);
1110 pos = (const u8 *) (bss + 1);
1111 end = pos + bss->ie_len;
1113 while (pos + 1 < end) {
1114 if (pos + 2 + pos[1] > end)
1116 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1117 vendor_type == WPA_GET_BE32(&pos[2]))
1118 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1122 if (wpabuf_len(buf) == 0) {
1132 * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry
1133 * @bss: BSS table entry
1134 * @vendor_type: Vendor type (four octets starting the IE payload)
1135 * Returns: Pointer to the information element payload or %NULL if not found
1137 * This function returns concatenated payload of possibly fragmented vendor
1138 * specific information elements in the BSS entry. The caller is responsible for
1139 * freeing the returned buffer.
1141 * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only
1142 * from Beacon frames instead of either Beacon or Probe Response frames.
1144 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
1148 const u8 *end, *pos;
1150 buf = wpabuf_alloc(bss->beacon_ie_len);
1154 pos = (const u8 *) (bss + 1);
1156 end = pos + bss->beacon_ie_len;
1158 while (pos + 1 < end) {
1159 if (pos + 2 + pos[1] > end)
1161 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1162 vendor_type == WPA_GET_BE32(&pos[2]))
1163 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1167 if (wpabuf_len(buf) == 0) {
1177 * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS
1178 * @bss: BSS table entry
1179 * Returns: Maximum legacy rate in units of 500 kbps
1181 int wpa_bss_get_max_rate(const struct wpa_bss *bss)
1187 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1188 for (i = 0; ie && i < ie[1]; i++) {
1189 if ((ie[i + 2] & 0x7f) > rate)
1190 rate = ie[i + 2] & 0x7f;
1193 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1194 for (i = 0; ie && i < ie[1]; i++) {
1195 if ((ie[i + 2] & 0x7f) > rate)
1196 rate = ie[i + 2] & 0x7f;
1204 * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS
1205 * @bss: BSS table entry
1206 * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps)
1207 * Returns: number of legacy TX rates or -1 on failure
1209 * The caller is responsible for freeing the returned buffer with os_free() in
1212 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
1219 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1220 ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1222 len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
1228 for (i = 0; ie && i < ie[1]; i++)
1229 r[i] = ie[i + 2] & 0x7f;
1231 for (j = 0; ie2 && j < ie2[1]; j++)
1232 r[i + j] = ie2[j + 2] & 0x7f;