3 * Copyright (c) 2009-2015, 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 "eap_peer/eap.h"
16 #include "wpa_supplicant_i.h"
23 #define WPA_BSS_FREQ_CHANGED_FLAG BIT(0)
24 #define WPA_BSS_SIGNAL_CHANGED_FLAG BIT(1)
25 #define WPA_BSS_PRIVACY_CHANGED_FLAG BIT(2)
26 #define WPA_BSS_MODE_CHANGED_FLAG BIT(3)
27 #define WPA_BSS_WPAIE_CHANGED_FLAG BIT(4)
28 #define WPA_BSS_RSNIE_CHANGED_FLAG BIT(5)
29 #define WPA_BSS_WPS_CHANGED_FLAG BIT(6)
30 #define WPA_BSS_RATES_CHANGED_FLAG BIT(7)
31 #define WPA_BSS_IES_CHANGED_FLAG BIT(8)
34 static void wpa_bss_set_hessid(struct wpa_bss *bss)
36 #ifdef CONFIG_INTERWORKING
37 const u8 *ie = wpa_bss_get_ie(bss, WLAN_EID_INTERWORKING);
38 if (ie == NULL || (ie[1] != 7 && ie[1] != 9)) {
39 os_memset(bss->hessid, 0, ETH_ALEN);
43 os_memcpy(bss->hessid, ie + 3, ETH_ALEN);
45 os_memcpy(bss->hessid, ie + 5, ETH_ALEN);
46 #endif /* CONFIG_INTERWORKING */
51 * wpa_bss_anqp_alloc - Allocate ANQP data structure for a BSS entry
52 * Returns: Allocated ANQP data structure or %NULL on failure
54 * The allocated ANQP data structure has its users count set to 1. It may be
55 * shared by multiple BSS entries and each shared entry is freed with
56 * wpa_bss_anqp_free().
58 struct wpa_bss_anqp * wpa_bss_anqp_alloc(void)
60 struct wpa_bss_anqp *anqp;
61 anqp = os_zalloc(sizeof(*anqp));
64 #ifdef CONFIG_INTERWORKING
65 dl_list_init(&anqp->anqp_elems);
66 #endif /* CONFIG_INTERWORKING */
73 * wpa_bss_anqp_clone - Clone an ANQP data structure
74 * @anqp: ANQP data structure from wpa_bss_anqp_alloc()
75 * Returns: Cloned ANQP data structure or %NULL on failure
77 static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp)
79 struct wpa_bss_anqp *n;
81 n = os_zalloc(sizeof(*n));
85 #define ANQP_DUP(f) if (anqp->f) n->f = wpabuf_dup(anqp->f)
86 #ifdef CONFIG_INTERWORKING
87 dl_list_init(&n->anqp_elems);
88 ANQP_DUP(capability_list);
90 ANQP_DUP(network_auth_type);
91 ANQP_DUP(roaming_consortium);
92 ANQP_DUP(ip_addr_type_availability);
95 ANQP_DUP(domain_name);
96 #endif /* CONFIG_INTERWORKING */
98 ANQP_DUP(hs20_capability_list);
99 ANQP_DUP(hs20_operator_friendly_name);
100 ANQP_DUP(hs20_wan_metrics);
101 ANQP_DUP(hs20_connection_capability);
102 ANQP_DUP(hs20_operating_class);
103 ANQP_DUP(hs20_osu_providers_list);
104 #endif /* CONFIG_HS20 */
112 * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry
114 * Returns: 0 on success, -1 on failure
116 * This function ensures the specific BSS entry has an ANQP data structure that
117 * is not shared with any other BSS entry.
119 int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss)
121 struct wpa_bss_anqp *anqp;
123 if (bss->anqp && bss->anqp->users > 1) {
124 /* allocated, but shared - clone an unshared copy */
125 anqp = wpa_bss_anqp_clone(bss->anqp);
135 return 0; /* already allocated and not shared */
137 /* not allocated - allocate a new storage area */
138 bss->anqp = wpa_bss_anqp_alloc();
139 return bss->anqp ? 0 : -1;
144 * wpa_bss_anqp_free - Free an ANQP data structure
145 * @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone()
147 static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp)
149 #ifdef CONFIG_INTERWORKING
150 struct wpa_bss_anqp_elem *elem;
151 #endif /* CONFIG_INTERWORKING */
157 if (anqp->users > 0) {
158 /* Another BSS entry holds a pointer to this ANQP info */
162 #ifdef CONFIG_INTERWORKING
163 wpabuf_free(anqp->capability_list);
164 wpabuf_free(anqp->venue_name);
165 wpabuf_free(anqp->network_auth_type);
166 wpabuf_free(anqp->roaming_consortium);
167 wpabuf_free(anqp->ip_addr_type_availability);
168 wpabuf_free(anqp->nai_realm);
169 wpabuf_free(anqp->anqp_3gpp);
170 wpabuf_free(anqp->domain_name);
172 while ((elem = dl_list_first(&anqp->anqp_elems,
173 struct wpa_bss_anqp_elem, list))) {
174 dl_list_del(&elem->list);
175 wpabuf_free(elem->payload);
178 #endif /* CONFIG_INTERWORKING */
180 wpabuf_free(anqp->hs20_capability_list);
181 wpabuf_free(anqp->hs20_operator_friendly_name);
182 wpabuf_free(anqp->hs20_wan_metrics);
183 wpabuf_free(anqp->hs20_connection_capability);
184 wpabuf_free(anqp->hs20_operating_class);
185 wpabuf_free(anqp->hs20_osu_providers_list);
186 #endif /* CONFIG_HS20 */
192 static void wpa_bss_update_pending_connect(struct wpa_supplicant *wpa_s,
193 struct wpa_bss *old_bss,
194 struct wpa_bss *new_bss)
196 struct wpa_radio_work *work;
197 struct wpa_connect_work *cwork;
199 work = radio_work_pending(wpa_s, "sme-connect");
201 work = radio_work_pending(wpa_s, "connect");
206 if (cwork->bss != old_bss)
209 wpa_printf(MSG_DEBUG,
210 "Update BSS pointer for the pending connect radio work");
211 cwork->bss = new_bss;
213 cwork->bss_removed = 1;
217 static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
220 if (wpa_s->last_scan_res) {
222 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
223 if (wpa_s->last_scan_res[i] == bss) {
224 os_memmove(&wpa_s->last_scan_res[i],
225 &wpa_s->last_scan_res[i + 1],
226 (wpa_s->last_scan_res_used - i - 1)
227 * sizeof(struct wpa_bss *));
228 wpa_s->last_scan_res_used--;
233 wpa_bss_update_pending_connect(wpa_s, bss, NULL);
234 dl_list_del(&bss->list);
235 dl_list_del(&bss->list_id);
237 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
238 " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
239 wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
240 wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
241 wpa_bss_anqp_free(bss->anqp);
247 * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID
248 * @wpa_s: Pointer to wpa_supplicant data
251 * @ssid_len: Length of @ssid
252 * Returns: Pointer to the BSS entry or %NULL if not found
254 struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
255 const u8 *ssid, size_t ssid_len)
258 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
260 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
261 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
262 bss->ssid_len == ssid_len &&
263 os_memcmp(bss->ssid, ssid, ssid_len) == 0)
270 static void calculate_update_time(const struct os_reltime *fetch_time,
272 struct os_reltime *update_time)
276 update_time->sec = fetch_time->sec;
277 update_time->usec = fetch_time->usec;
278 update_time->sec -= age_ms / 1000;
279 usec = (age_ms % 1000) * 1000;
280 if (update_time->usec < usec) {
282 update_time->usec += 1000000;
284 update_time->usec -= usec;
288 static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src,
289 struct os_reltime *fetch_time)
291 dst->flags = src->flags;
292 os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
293 dst->freq = src->freq;
294 dst->beacon_int = src->beacon_int;
295 dst->caps = src->caps;
296 dst->qual = src->qual;
297 dst->noise = src->noise;
298 dst->level = src->level;
300 dst->est_throughput = src->est_throughput;
303 calculate_update_time(fetch_time, src->age, &dst->last_update);
307 static int wpa_bss_is_wps_candidate(struct wpa_supplicant *wpa_s,
311 struct wpa_ssid *ssid;
312 struct wpabuf *wps_ie;
315 wps_ie = wpa_bss_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
319 if (wps_is_selected_pbc_registrar(wps_ie)) {
321 } else if (!wps_is_addr_authorized(wps_ie, wpa_s->own_addr, 1)) {
326 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
327 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
329 if (ssid->ssid_len &&
330 (ssid->ssid_len != bss->ssid_len ||
331 os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) != 0))
335 ret = eap_is_wps_pbc_enrollee(&ssid->eap);
337 ret = eap_is_wps_pin_enrollee(&ssid->eap);
342 #endif /* CONFIG_WPS */
348 static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
350 struct wpa_ssid *ssid;
352 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
353 if (ssid->ssid == NULL || ssid->ssid_len == 0)
355 if (ssid->ssid_len == bss->ssid_len &&
356 os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
364 static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
366 if (bss == wpa_s->current_bss)
369 if (wpa_s->current_bss &&
370 (bss->ssid_len != wpa_s->current_bss->ssid_len ||
371 os_memcmp(bss->ssid, wpa_s->current_bss->ssid,
372 bss->ssid_len) != 0))
373 return 0; /* SSID has changed */
375 return !is_zero_ether_addr(bss->bssid) &&
376 (os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
377 os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0);
381 static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
385 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
386 if (!wpa_bss_known(wpa_s, bss) &&
387 !wpa_bss_is_wps_candidate(wpa_s, bss)) {
388 wpa_bss_remove(wpa_s, bss, __func__);
397 static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
402 * Remove the oldest entry that does not match with any configured
405 if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
409 * Remove the oldest entry that isn't currently in use.
411 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
412 if (!wpa_bss_in_use(wpa_s, bss)) {
413 wpa_bss_remove(wpa_s, bss, __func__);
422 static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
423 const u8 *ssid, size_t ssid_len,
424 struct wpa_scan_res *res,
425 struct os_reltime *fetch_time)
429 bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
432 bss->id = wpa_s->bss_next_id++;
433 bss->last_update_idx = wpa_s->bss_update_idx;
434 wpa_bss_copy_res(bss, res, fetch_time);
435 os_memcpy(bss->ssid, ssid, ssid_len);
436 bss->ssid_len = ssid_len;
437 bss->ie_len = res->ie_len;
438 bss->beacon_ie_len = res->beacon_ie_len;
439 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
440 wpa_bss_set_hessid(bss);
442 if (wpa_s->num_bss + 1 > wpa_s->conf->bss_max_count &&
443 wpa_bss_remove_oldest(wpa_s) != 0) {
444 wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
445 "because all BSSes are in use. We should normally "
446 "not get here!", (int) wpa_s->num_bss + 1);
447 wpa_s->conf->bss_max_count = wpa_s->num_bss + 1;
450 dl_list_add_tail(&wpa_s->bss, &bss->list);
451 dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
453 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
454 " SSID '%s' freq %d",
455 bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len),
457 wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
462 static int are_ies_equal(const struct wpa_bss *old,
463 const struct wpa_scan_res *new_res, u32 ie)
465 const u8 *old_ie, *new_ie;
466 struct wpabuf *old_ie_buff = NULL;
467 struct wpabuf *new_ie_buff = NULL;
468 int new_ie_len, old_ie_len, ret, is_multi;
471 case WPA_IE_VENDOR_TYPE:
472 old_ie = wpa_bss_get_vendor_ie(old, ie);
473 new_ie = wpa_scan_get_vendor_ie(new_res, ie);
476 case WPS_IE_VENDOR_TYPE:
477 old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
478 new_ie_buff = wpa_scan_get_vendor_ie_multi(new_res, ie);
482 case WLAN_EID_SUPP_RATES:
483 case WLAN_EID_EXT_SUPP_RATES:
484 old_ie = wpa_bss_get_ie(old, ie);
485 new_ie = wpa_scan_get_ie(new_res, ie);
489 wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
494 /* in case of multiple IEs stored in buffer */
495 old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
496 new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
497 old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
498 new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
500 /* in case of single IE */
501 old_ie_len = old_ie ? old_ie[1] + 2 : 0;
502 new_ie_len = new_ie ? new_ie[1] + 2 : 0;
505 if (!old_ie || !new_ie)
506 ret = !old_ie && !new_ie;
508 ret = (old_ie_len == new_ie_len &&
509 os_memcmp(old_ie, new_ie, old_ie_len) == 0);
511 wpabuf_free(old_ie_buff);
512 wpabuf_free(new_ie_buff);
518 static u32 wpa_bss_compare_res(const struct wpa_bss *old,
519 const struct wpa_scan_res *new_res)
522 int caps_diff = old->caps ^ new_res->caps;
524 if (old->freq != new_res->freq)
525 changes |= WPA_BSS_FREQ_CHANGED_FLAG;
527 if (old->level != new_res->level)
528 changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
530 if (caps_diff & IEEE80211_CAP_PRIVACY)
531 changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
533 if (caps_diff & IEEE80211_CAP_IBSS)
534 changes |= WPA_BSS_MODE_CHANGED_FLAG;
536 if (old->ie_len == new_res->ie_len &&
537 os_memcmp(old + 1, new_res + 1, old->ie_len) == 0)
539 changes |= WPA_BSS_IES_CHANGED_FLAG;
541 if (!are_ies_equal(old, new_res, WPA_IE_VENDOR_TYPE))
542 changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
544 if (!are_ies_equal(old, new_res, WLAN_EID_RSN))
545 changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
547 if (!are_ies_equal(old, new_res, WPS_IE_VENDOR_TYPE))
548 changes |= WPA_BSS_WPS_CHANGED_FLAG;
550 if (!are_ies_equal(old, new_res, WLAN_EID_SUPP_RATES) ||
551 !are_ies_equal(old, new_res, WLAN_EID_EXT_SUPP_RATES))
552 changes |= WPA_BSS_RATES_CHANGED_FLAG;
558 static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
559 const struct wpa_bss *bss)
561 if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
562 wpas_notify_bss_freq_changed(wpa_s, bss->id);
564 if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
565 wpas_notify_bss_signal_changed(wpa_s, bss->id);
567 if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
568 wpas_notify_bss_privacy_changed(wpa_s, bss->id);
570 if (changes & WPA_BSS_MODE_CHANGED_FLAG)
571 wpas_notify_bss_mode_changed(wpa_s, bss->id);
573 if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
574 wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
576 if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
577 wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
579 if (changes & WPA_BSS_WPS_CHANGED_FLAG)
580 wpas_notify_bss_wps_changed(wpa_s, bss->id);
582 if (changes & WPA_BSS_IES_CHANGED_FLAG)
583 wpas_notify_bss_ies_changed(wpa_s, bss->id);
585 if (changes & WPA_BSS_RATES_CHANGED_FLAG)
586 wpas_notify_bss_rates_changed(wpa_s, bss->id);
588 wpas_notify_bss_seen(wpa_s, bss->id);
592 static struct wpa_bss *
593 wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
594 struct wpa_scan_res *res, struct os_reltime *fetch_time)
598 changes = wpa_bss_compare_res(bss, res);
599 if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
600 wpa_printf(MSG_DEBUG, "BSS: " MACSTR " changed freq %d --> %d",
601 MAC2STR(bss->bssid), bss->freq, res->freq);
602 bss->scan_miss_count = 0;
603 bss->last_update_idx = wpa_s->bss_update_idx;
604 wpa_bss_copy_res(bss, res, fetch_time);
605 /* Move the entry to the end of the list */
606 dl_list_del(&bss->list);
608 if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) &&
609 !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) {
611 * This can happen when non-P2P station interface runs a scan
612 * without P2P IE in the Probe Request frame. P2P GO would reply
613 * to that with a Probe Response that does not include P2P IE.
614 * Do not update the IEs in this BSS entry to avoid such loss of
615 * information that may be needed for P2P operations to
616 * determine group information.
618 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Do not update scan IEs for "
619 MACSTR " since that would remove P2P IE information",
620 MAC2STR(bss->bssid));
622 #endif /* CONFIG_P2P */
623 if (bss->ie_len + bss->beacon_ie_len >=
624 res->ie_len + res->beacon_ie_len) {
625 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
626 bss->ie_len = res->ie_len;
627 bss->beacon_ie_len = res->beacon_ie_len;
629 struct wpa_bss *nbss;
630 struct dl_list *prev = bss->list_id.prev;
631 dl_list_del(&bss->list_id);
632 nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
636 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
637 if (wpa_s->last_scan_res[i] == bss) {
638 wpa_s->last_scan_res[i] = nbss;
642 if (wpa_s->current_bss == bss)
643 wpa_s->current_bss = nbss;
644 wpa_bss_update_pending_connect(wpa_s, bss, nbss);
646 os_memcpy(bss + 1, res + 1,
647 res->ie_len + res->beacon_ie_len);
648 bss->ie_len = res->ie_len;
649 bss->beacon_ie_len = res->beacon_ie_len;
651 dl_list_add(prev, &bss->list_id);
653 if (changes & WPA_BSS_IES_CHANGED_FLAG)
654 wpa_bss_set_hessid(bss);
655 dl_list_add_tail(&wpa_s->bss, &bss->list);
657 notify_bss_changes(wpa_s, changes, bss);
664 * wpa_bss_update_start - Start a BSS table update from scan results
665 * @wpa_s: Pointer to wpa_supplicant data
667 * This function is called at the start of each BSS table update round for new
668 * scan results. The actual scan result entries are indicated with calls to
669 * wpa_bss_update_scan_res() and the update round is finished with a call to
670 * wpa_bss_update_end().
672 void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
674 wpa_s->bss_update_idx++;
675 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
676 wpa_s->bss_update_idx);
677 wpa_s->last_scan_res_used = 0;
682 * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
683 * @wpa_s: Pointer to wpa_supplicant data
685 * @fetch_time: Time when the result was fetched from the driver
687 * This function updates a BSS table entry (or adds one) based on a scan result.
688 * This is called separately for each scan result between the calls to
689 * wpa_bss_update_start() and wpa_bss_update_end().
691 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
692 struct wpa_scan_res *res,
693 struct os_reltime *fetch_time)
695 const u8 *ssid, *p2p, *mesh;
698 if (wpa_s->conf->ignore_old_scan_res) {
699 struct os_reltime update;
700 calculate_update_time(fetch_time, res->age, &update);
701 if (os_reltime_before(&update, &wpa_s->scan_trigger_time)) {
702 struct os_reltime age;
703 os_reltime_sub(&wpa_s->scan_trigger_time, &update,
705 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Ignore driver BSS "
706 "table entry that is %u.%06u seconds older "
707 "than our scan trigger",
708 (unsigned int) age.sec,
709 (unsigned int) age.usec);
714 ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
716 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
717 MACSTR, MAC2STR(res->bssid));
720 if (ssid[1] > SSID_MAX_LEN) {
721 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
722 MACSTR, MAC2STR(res->bssid));
726 p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
729 wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
731 * If it's a P2P specific interface, then don't update
732 * the scan result without a P2P IE.
734 wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
735 " update for P2P interface", MAC2STR(res->bssid));
738 #endif /* CONFIG_P2P */
739 if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
740 os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
741 return; /* Skip P2P listen discovery results here */
743 /* TODO: add option for ignoring BSSes we are not interested in
744 * (to save memory) */
746 mesh = wpa_scan_get_ie(res, WLAN_EID_MESH_ID);
747 if (mesh && mesh[1] <= SSID_MAX_LEN)
750 bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
752 bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time);
754 bss = wpa_bss_update(wpa_s, bss, res, fetch_time);
755 if (wpa_s->last_scan_res) {
757 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
758 if (bss == wpa_s->last_scan_res[i]) {
759 /* Already in the list */
768 if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
771 if (wpa_s->last_scan_res_size == 0)
774 siz = wpa_s->last_scan_res_size * 2;
775 n = os_realloc_array(wpa_s->last_scan_res, siz,
776 sizeof(struct wpa_bss *));
779 wpa_s->last_scan_res = n;
780 wpa_s->last_scan_res_size = siz;
783 if (wpa_s->last_scan_res)
784 wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
788 static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
789 const struct scan_info *info)
797 if (info->num_freqs) {
799 for (i = 0; i < info->num_freqs; i++) {
800 if (bss->freq == info->freqs[i]) {
809 if (info->num_ssids) {
811 for (i = 0; i < info->num_ssids; i++) {
812 const struct wpa_driver_scan_ssid *s = &info->ssids[i];
813 if ((s->ssid == NULL || s->ssid_len == 0) ||
814 (s->ssid_len == bss->ssid_len &&
815 os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
830 * wpa_bss_update_end - End a BSS table update from scan results
831 * @wpa_s: Pointer to wpa_supplicant data
832 * @info: Information about scan parameters
833 * @new_scan: Whether this update round was based on a new scan
835 * This function is called at the end of each BSS table update round for new
836 * scan results. The start of the update was indicated with a call to
837 * wpa_bss_update_start().
839 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
842 struct wpa_bss *bss, *n;
844 os_get_reltime(&wpa_s->last_scan);
845 if ((info && info->aborted) || !new_scan)
846 return; /* do not expire entries without new scan */
848 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
849 if (wpa_bss_in_use(wpa_s, bss))
851 if (!wpa_bss_included_in_scan(bss, info))
852 continue; /* expire only BSSes that were scanned */
853 if (bss->last_update_idx < wpa_s->bss_update_idx)
854 bss->scan_miss_count++;
855 if (bss->scan_miss_count >=
856 wpa_s->conf->bss_expiration_scan_count) {
857 wpa_bss_remove(wpa_s, bss, "no match in scan");
861 wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u",
862 wpa_s->last_scan_res_used, wpa_s->last_scan_res_size);
867 * wpa_bss_flush_by_age - Flush old BSS entries
868 * @wpa_s: Pointer to wpa_supplicant data
869 * @age: Maximum entry age in seconds
871 * Remove BSS entries that have not been updated during the last @age seconds.
873 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
875 struct wpa_bss *bss, *n;
878 if (dl_list_empty(&wpa_s->bss))
884 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
885 if (wpa_bss_in_use(wpa_s, bss))
888 if (os_reltime_before(&bss->last_update, &t)) {
889 wpa_bss_remove(wpa_s, bss, __func__);
897 * wpa_bss_init - Initialize BSS table
898 * @wpa_s: Pointer to wpa_supplicant data
899 * Returns: 0 on success, -1 on failure
901 * This prepares BSS table lists and timer for periodic updates. The BSS table
902 * is deinitialized with wpa_bss_deinit() once not needed anymore.
904 int wpa_bss_init(struct wpa_supplicant *wpa_s)
906 dl_list_init(&wpa_s->bss);
907 dl_list_init(&wpa_s->bss_id);
913 * wpa_bss_flush - Flush all unused BSS entries
914 * @wpa_s: Pointer to wpa_supplicant data
916 void wpa_bss_flush(struct wpa_supplicant *wpa_s)
918 struct wpa_bss *bss, *n;
920 wpa_s->clear_driver_scan_cache = 1;
922 if (wpa_s->bss.next == NULL)
923 return; /* BSS table not yet initialized */
925 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
926 if (wpa_bss_in_use(wpa_s, bss))
928 wpa_bss_remove(wpa_s, bss, __func__);
934 * wpa_bss_deinit - Deinitialize BSS table
935 * @wpa_s: Pointer to wpa_supplicant data
937 void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
939 wpa_bss_flush(wpa_s);
944 * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
945 * @wpa_s: Pointer to wpa_supplicant data
947 * Returns: Pointer to the BSS entry or %NULL if not found
949 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
953 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
955 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
956 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
964 * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
965 * @wpa_s: Pointer to wpa_supplicant data
967 * Returns: Pointer to the BSS entry or %NULL if not found
969 * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to
970 * find the entry that has the most recent update. This can help in finding the
971 * correct entry in cases where the SSID of the AP may have changed recently
972 * (e.g., in WPS reconfiguration cases).
974 struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
977 struct wpa_bss *bss, *found = NULL;
978 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
980 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
981 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0)
984 os_reltime_before(&found->last_update, &bss->last_update))
993 * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr
994 * @wpa_s: Pointer to wpa_supplicant data
995 * @dev_addr: P2P Device Address of the GO
996 * Returns: Pointer to the BSS entry or %NULL if not found
998 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
1001 struct wpa_bss *bss;
1002 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
1004 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
1006 os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
1011 #endif /* CONFIG_P2P */
1015 * wpa_bss_get_id - Fetch a BSS table entry based on identifier
1016 * @wpa_s: Pointer to wpa_supplicant data
1017 * @id: Unique identifier (struct wpa_bss::id) assigned for the entry
1018 * Returns: Pointer to the BSS entry or %NULL if not found
1020 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
1022 struct wpa_bss *bss;
1023 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1032 * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range
1033 * @wpa_s: Pointer to wpa_supplicant data
1034 * @idf: Smallest allowed identifier assigned for the entry
1035 * @idf: Largest allowed identifier assigned for the entry
1036 * Returns: Pointer to the BSS entry or %NULL if not found
1038 * This function is similar to wpa_bss_get_id() but allows a BSS entry with the
1039 * smallest id value to be fetched within the specified range without the
1040 * caller having to know the exact id.
1042 struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
1043 unsigned int idf, unsigned int idl)
1045 struct wpa_bss *bss;
1046 dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) {
1047 if (bss->id >= idf && bss->id <= idl)
1055 * wpa_bss_get_ie - Fetch a specified information element from a BSS entry
1056 * @bss: BSS table entry
1057 * @ie: Information element identitifier (WLAN_EID_*)
1058 * Returns: Pointer to the information element (id field) or %NULL if not found
1060 * This function returns the first matching information element in the BSS
1063 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
1065 return get_ie((const u8 *) (bss + 1), bss->ie_len, ie);
1070 * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry
1071 * @bss: BSS table entry
1072 * @vendor_type: Vendor type (four octets starting the IE payload)
1073 * Returns: Pointer to the information element (id field) or %NULL if not found
1075 * This function returns the first matching information element in the BSS
1078 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
1080 const u8 *end, *pos;
1082 pos = (const u8 *) (bss + 1);
1083 end = pos + bss->ie_len;
1085 while (end - pos > 1) {
1086 if (2 + pos[1] > end - pos)
1088 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1089 vendor_type == WPA_GET_BE32(&pos[2]))
1099 * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry
1100 * @bss: BSS table entry
1101 * @vendor_type: Vendor type (four octets starting the IE payload)
1102 * Returns: Pointer to the information element (id field) or %NULL if not found
1104 * This function returns the first matching information element in the BSS
1107 * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only
1108 * from Beacon frames instead of either Beacon or Probe Response frames.
1110 const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
1113 const u8 *end, *pos;
1115 if (bss->beacon_ie_len == 0)
1118 pos = (const u8 *) (bss + 1);
1120 end = pos + bss->beacon_ie_len;
1122 while (end - pos > 1) {
1123 if (2 + pos[1] > end - pos)
1125 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1126 vendor_type == WPA_GET_BE32(&pos[2]))
1136 * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
1137 * @bss: BSS table entry
1138 * @vendor_type: Vendor type (four octets starting the IE payload)
1139 * Returns: Pointer to the information element payload or %NULL if not found
1141 * This function returns concatenated payload of possibly fragmented vendor
1142 * specific information elements in the BSS entry. The caller is responsible for
1143 * freeing the returned buffer.
1145 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
1149 const u8 *end, *pos;
1151 buf = wpabuf_alloc(bss->ie_len);
1155 pos = (const u8 *) (bss + 1);
1156 end = pos + bss->ie_len;
1158 while (end - pos > 1) {
1159 if (2 + pos[1] > end - pos)
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_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry
1178 * @bss: BSS table entry
1179 * @vendor_type: Vendor type (four octets starting the IE payload)
1180 * Returns: Pointer to the information element payload or %NULL if not found
1182 * This function returns concatenated payload of possibly fragmented vendor
1183 * specific information elements in the BSS entry. The caller is responsible for
1184 * freeing the returned buffer.
1186 * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only
1187 * from Beacon frames instead of either Beacon or Probe Response frames.
1189 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
1193 const u8 *end, *pos;
1195 buf = wpabuf_alloc(bss->beacon_ie_len);
1199 pos = (const u8 *) (bss + 1);
1201 end = pos + bss->beacon_ie_len;
1203 while (end - pos > 1) {
1204 if (2 + pos[1] > end - pos)
1206 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1207 vendor_type == WPA_GET_BE32(&pos[2]))
1208 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1212 if (wpabuf_len(buf) == 0) {
1222 * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS
1223 * @bss: BSS table entry
1224 * Returns: Maximum legacy rate in units of 500 kbps
1226 int wpa_bss_get_max_rate(const struct wpa_bss *bss)
1232 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1233 for (i = 0; ie && i < ie[1]; i++) {
1234 if ((ie[i + 2] & 0x7f) > rate)
1235 rate = ie[i + 2] & 0x7f;
1238 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1239 for (i = 0; ie && i < ie[1]; i++) {
1240 if ((ie[i + 2] & 0x7f) > rate)
1241 rate = ie[i + 2] & 0x7f;
1249 * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS
1250 * @bss: BSS table entry
1251 * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps)
1252 * Returns: number of legacy TX rates or -1 on failure
1254 * The caller is responsible for freeing the returned buffer with os_free() in
1257 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
1264 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1265 ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1267 len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
1273 for (i = 0; ie && i < ie[1]; i++)
1274 r[i] = ie[i + 2] & 0x7f;
1276 for (j = 0; ie2 && j < ie2[1]; j++)
1277 r[i + j] = ie2[j + 2] & 0x7f;