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 wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src,
228 struct os_time *fetch_time)
232 dst->flags = src->flags;
233 os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
234 dst->freq = src->freq;
235 dst->beacon_int = src->beacon_int;
236 dst->caps = src->caps;
237 dst->qual = src->qual;
238 dst->noise = src->noise;
239 dst->level = src->level;
242 dst->last_update.sec = fetch_time->sec;
243 dst->last_update.usec = fetch_time->usec;
244 dst->last_update.sec -= src->age / 1000;
245 usec = (src->age % 1000) * 1000;
246 if (dst->last_update.usec < usec) {
247 dst->last_update.sec--;
248 dst->last_update.usec += 1000000;
250 dst->last_update.usec -= usec;
254 static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
256 struct wpa_ssid *ssid;
258 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
259 if (ssid->ssid == NULL || ssid->ssid_len == 0)
261 if (ssid->ssid_len == bss->ssid_len &&
262 os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
270 static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
272 return bss == wpa_s->current_bss ||
273 os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
274 os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0;
278 static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
282 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
283 if (!wpa_bss_known(wpa_s, bss)) {
284 wpa_bss_remove(wpa_s, bss, __func__);
293 static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
298 * Remove the oldest entry that does not match with any configured
301 if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
305 * Remove the oldest entry that isn't currently in use.
307 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
308 if (!wpa_bss_in_use(wpa_s, bss)) {
309 wpa_bss_remove(wpa_s, bss, __func__);
318 static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
319 const u8 *ssid, size_t ssid_len,
320 struct wpa_scan_res *res,
321 struct os_time *fetch_time)
325 bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
328 bss->id = wpa_s->bss_next_id++;
329 bss->last_update_idx = wpa_s->bss_update_idx;
330 wpa_bss_copy_res(bss, res, fetch_time);
331 os_memcpy(bss->ssid, ssid, ssid_len);
332 bss->ssid_len = ssid_len;
333 bss->ie_len = res->ie_len;
334 bss->beacon_ie_len = res->beacon_ie_len;
335 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
336 wpa_bss_set_hessid(bss);
338 dl_list_add_tail(&wpa_s->bss, &bss->list);
339 dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
341 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
343 bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
344 wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
345 if (wpa_s->num_bss > wpa_s->conf->bss_max_count &&
346 wpa_bss_remove_oldest(wpa_s) != 0) {
347 wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
348 "because all BSSes are in use. We should normally "
349 "not get here!", (int) wpa_s->num_bss);
350 wpa_s->conf->bss_max_count = wpa_s->num_bss;
356 static int are_ies_equal(const struct wpa_bss *old,
357 const struct wpa_scan_res *new, u32 ie)
359 const u8 *old_ie, *new_ie;
360 struct wpabuf *old_ie_buff = NULL;
361 struct wpabuf *new_ie_buff = NULL;
362 int new_ie_len, old_ie_len, ret, is_multi;
365 case WPA_IE_VENDOR_TYPE:
366 old_ie = wpa_bss_get_vendor_ie(old, ie);
367 new_ie = wpa_scan_get_vendor_ie(new, ie);
370 case WPS_IE_VENDOR_TYPE:
371 old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
372 new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie);
376 case WLAN_EID_SUPP_RATES:
377 case WLAN_EID_EXT_SUPP_RATES:
378 old_ie = wpa_bss_get_ie(old, ie);
379 new_ie = wpa_scan_get_ie(new, ie);
383 wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
388 /* in case of multiple IEs stored in buffer */
389 old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
390 new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
391 old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
392 new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
394 /* in case of single IE */
395 old_ie_len = old_ie ? old_ie[1] + 2 : 0;
396 new_ie_len = new_ie ? new_ie[1] + 2 : 0;
399 if (!old_ie || !new_ie)
400 ret = !old_ie && !new_ie;
402 ret = (old_ie_len == new_ie_len &&
403 os_memcmp(old_ie, new_ie, old_ie_len) == 0);
405 wpabuf_free(old_ie_buff);
406 wpabuf_free(new_ie_buff);
412 static u32 wpa_bss_compare_res(const struct wpa_bss *old,
413 const struct wpa_scan_res *new)
416 int caps_diff = old->caps ^ new->caps;
418 if (old->freq != new->freq)
419 changes |= WPA_BSS_FREQ_CHANGED_FLAG;
421 if (old->level != new->level)
422 changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
424 if (caps_diff & IEEE80211_CAP_PRIVACY)
425 changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
427 if (caps_diff & IEEE80211_CAP_IBSS)
428 changes |= WPA_BSS_MODE_CHANGED_FLAG;
430 if (old->ie_len == new->ie_len &&
431 os_memcmp(old + 1, new + 1, old->ie_len) == 0)
433 changes |= WPA_BSS_IES_CHANGED_FLAG;
435 if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
436 changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
438 if (!are_ies_equal(old, new, WLAN_EID_RSN))
439 changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
441 if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE))
442 changes |= WPA_BSS_WPS_CHANGED_FLAG;
444 if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) ||
445 !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES))
446 changes |= WPA_BSS_RATES_CHANGED_FLAG;
452 static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
453 const struct wpa_bss *bss)
455 if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
456 wpas_notify_bss_freq_changed(wpa_s, bss->id);
458 if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
459 wpas_notify_bss_signal_changed(wpa_s, bss->id);
461 if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
462 wpas_notify_bss_privacy_changed(wpa_s, bss->id);
464 if (changes & WPA_BSS_MODE_CHANGED_FLAG)
465 wpas_notify_bss_mode_changed(wpa_s, bss->id);
467 if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
468 wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
470 if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
471 wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
473 if (changes & WPA_BSS_WPS_CHANGED_FLAG)
474 wpas_notify_bss_wps_changed(wpa_s, bss->id);
476 if (changes & WPA_BSS_IES_CHANGED_FLAG)
477 wpas_notify_bss_ies_changed(wpa_s, bss->id);
479 if (changes & WPA_BSS_RATES_CHANGED_FLAG)
480 wpas_notify_bss_rates_changed(wpa_s, bss->id);
484 static struct wpa_bss *
485 wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
486 struct wpa_scan_res *res, struct os_time *fetch_time)
490 changes = wpa_bss_compare_res(bss, res);
491 bss->scan_miss_count = 0;
492 bss->last_update_idx = wpa_s->bss_update_idx;
493 wpa_bss_copy_res(bss, res, fetch_time);
494 /* Move the entry to the end of the list */
495 dl_list_del(&bss->list);
496 if (bss->ie_len + bss->beacon_ie_len >=
497 res->ie_len + res->beacon_ie_len) {
498 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
499 bss->ie_len = res->ie_len;
500 bss->beacon_ie_len = res->beacon_ie_len;
502 struct wpa_bss *nbss;
503 struct dl_list *prev = bss->list_id.prev;
504 dl_list_del(&bss->list_id);
505 nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
509 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
510 if (wpa_s->last_scan_res[i] == bss) {
511 wpa_s->last_scan_res[i] = nbss;
515 if (wpa_s->current_bss == bss)
516 wpa_s->current_bss = nbss;
518 os_memcpy(bss + 1, res + 1,
519 res->ie_len + res->beacon_ie_len);
520 bss->ie_len = res->ie_len;
521 bss->beacon_ie_len = res->beacon_ie_len;
523 dl_list_add(prev, &bss->list_id);
525 if (changes & WPA_BSS_IES_CHANGED_FLAG)
526 wpa_bss_set_hessid(bss);
527 dl_list_add_tail(&wpa_s->bss, &bss->list);
529 notify_bss_changes(wpa_s, changes, bss);
536 * wpa_bss_update_start - Start a BSS table update from scan results
537 * @wpa_s: Pointer to wpa_supplicant data
539 * This function is called at the start of each BSS table update round for new
540 * scan results. The actual scan result entries are indicated with calls to
541 * wpa_bss_update_scan_res() and the update round is finished with a call to
542 * wpa_bss_update_end().
544 void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
546 wpa_s->bss_update_idx++;
547 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
548 wpa_s->bss_update_idx);
549 wpa_s->last_scan_res_used = 0;
554 * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
555 * @wpa_s: Pointer to wpa_supplicant data
557 * @fetch_time: Time when the result was fetched from the driver
559 * This function updates a BSS table entry (or adds one) based on a scan result.
560 * This is called separately for each scan result between the calls to
561 * wpa_bss_update_start() and wpa_bss_update_end().
563 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
564 struct wpa_scan_res *res,
565 struct os_time *fetch_time)
567 const u8 *ssid, *p2p;
570 ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
572 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
573 MACSTR, MAC2STR(res->bssid));
577 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
578 MACSTR, MAC2STR(res->bssid));
582 p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
585 wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
587 * If it's a P2P specific interface, then don't update
588 * the scan result without a P2P IE.
590 wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
591 " update for P2P interface", MAC2STR(res->bssid));
594 #endif /* CONFIG_P2P */
595 if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
596 os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
597 return; /* Skip P2P listen discovery results here */
599 /* TODO: add option for ignoring BSSes we are not interested in
600 * (to save memory) */
601 bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
603 bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time);
605 bss = wpa_bss_update(wpa_s, bss, res, fetch_time);
609 if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
612 if (wpa_s->last_scan_res_size == 0)
615 siz = wpa_s->last_scan_res_size * 2;
616 n = os_realloc_array(wpa_s->last_scan_res, siz,
617 sizeof(struct wpa_bss *));
620 wpa_s->last_scan_res = n;
621 wpa_s->last_scan_res_size = siz;
624 wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
628 static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
629 const struct scan_info *info)
637 if (info->num_freqs) {
639 for (i = 0; i < info->num_freqs; i++) {
640 if (bss->freq == info->freqs[i]) {
649 if (info->num_ssids) {
651 for (i = 0; i < info->num_ssids; i++) {
652 const struct wpa_driver_scan_ssid *s = &info->ssids[i];
653 if ((s->ssid == NULL || s->ssid_len == 0) ||
654 (s->ssid_len == bss->ssid_len &&
655 os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
670 * wpa_bss_update_end - End a BSS table update from scan results
671 * @wpa_s: Pointer to wpa_supplicant data
672 * @info: Information about scan parameters
673 * @new_scan: Whether this update round was based on a new scan
675 * This function is called at the end of each BSS table update round for new
676 * scan results. The start of the update was indicated with a call to
677 * wpa_bss_update_start().
679 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
682 struct wpa_bss *bss, *n;
684 wpa_s->last_scan_full = 0;
685 os_get_time(&wpa_s->last_scan);
687 return; /* do not expire entries without new scan */
689 if (info && !info->aborted && !info->freqs) {
691 if (info->num_ssids == 0) {
692 wpa_s->last_scan_full = 1;
694 for (i = 0; i < info->num_ssids; i++) {
695 if (info->ssids[i].ssid == NULL ||
696 info->ssids[i].ssid_len == 0) {
697 wpa_s->last_scan_full = 1;
704 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
705 if (wpa_bss_in_use(wpa_s, bss))
707 if (!wpa_bss_included_in_scan(bss, info))
708 continue; /* expire only BSSes that were scanned */
709 if (bss->last_update_idx < wpa_s->bss_update_idx)
710 bss->scan_miss_count++;
711 if (bss->scan_miss_count >=
712 wpa_s->conf->bss_expiration_scan_count) {
713 wpa_bss_remove(wpa_s, bss, "no match in scan");
717 wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u "
719 wpa_s->last_scan_res_used, wpa_s->last_scan_res_size,
720 wpa_s->last_scan_full);
725 * wpa_bss_flush_by_age - Flush old BSS entries
726 * @wpa_s: Pointer to wpa_supplicant data
727 * @age: Maximum entry age in seconds
729 * Remove BSS entries that have not been updated during the last @age seconds.
731 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
733 struct wpa_bss *bss, *n;
736 if (dl_list_empty(&wpa_s->bss))
742 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
743 if (wpa_bss_in_use(wpa_s, bss))
746 if (os_time_before(&bss->last_update, &t)) {
747 wpa_bss_remove(wpa_s, bss, __func__);
754 static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
756 struct wpa_supplicant *wpa_s = eloop_ctx;
758 wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
759 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
760 wpa_bss_timeout, wpa_s, NULL);
765 * wpa_bss_init - Initialize BSS table
766 * @wpa_s: Pointer to wpa_supplicant data
767 * Returns: 0 on success, -1 on failure
769 * This prepares BSS table lists and timer for periodic updates. The BSS table
770 * is deinitialized with wpa_bss_deinit() once not needed anymore.
772 int wpa_bss_init(struct wpa_supplicant *wpa_s)
774 dl_list_init(&wpa_s->bss);
775 dl_list_init(&wpa_s->bss_id);
776 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
777 wpa_bss_timeout, wpa_s, NULL);
783 * wpa_bss_flush - Flush all unused BSS entries
784 * @wpa_s: Pointer to wpa_supplicant data
786 void wpa_bss_flush(struct wpa_supplicant *wpa_s)
788 struct wpa_bss *bss, *n;
790 if (wpa_s->bss.next == NULL)
791 return; /* BSS table not yet initialized */
793 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
794 if (wpa_bss_in_use(wpa_s, bss))
796 wpa_bss_remove(wpa_s, bss, __func__);
802 * wpa_bss_deinit - Deinitialize BSS table
803 * @wpa_s: Pointer to wpa_supplicant data
805 void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
807 eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
808 wpa_bss_flush(wpa_s);
813 * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
814 * @wpa_s: Pointer to wpa_supplicant data
816 * Returns: Pointer to the BSS entry or %NULL if not found
818 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
822 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
824 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
825 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
833 * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
834 * @wpa_s: Pointer to wpa_supplicant data
836 * Returns: Pointer to the BSS entry or %NULL if not found
838 * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to
839 * find the entry that has the most recent update. This can help in finding the
840 * correct entry in cases where the SSID of the AP may have changed recently
841 * (e.g., in WPS reconfiguration cases).
843 struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
846 struct wpa_bss *bss, *found = NULL;
847 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
849 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
850 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0)
853 os_time_before(&found->last_update, &bss->last_update))
862 * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr
863 * @wpa_s: Pointer to wpa_supplicant data
864 * @dev_addr: P2P Device Address of the GO
865 * Returns: Pointer to the BSS entry or %NULL if not found
867 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
871 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
873 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
875 os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
880 #endif /* CONFIG_P2P */
884 * wpa_bss_get_id - Fetch a BSS table entry based on identifier
885 * @wpa_s: Pointer to wpa_supplicant data
886 * @id: Unique identifier (struct wpa_bss::id) assigned for the entry
887 * Returns: Pointer to the BSS entry or %NULL if not found
889 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
892 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
901 * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range
902 * @wpa_s: Pointer to wpa_supplicant data
903 * @idf: Smallest allowed identifier assigned for the entry
904 * @idf: Largest allowed identifier assigned for the entry
905 * Returns: Pointer to the BSS entry or %NULL if not found
907 * This function is similar to wpa_bss_get_id() but allows a BSS entry with the
908 * smallest id value to be fetched within the specified range without the
909 * caller having to know the exact id.
911 struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
912 unsigned int idf, unsigned int idl)
915 dl_list_for_each(bss, &wpa_s->bss_id, struct wpa_bss, list_id) {
916 if (bss->id >= idf && bss->id <= idl)
924 * wpa_bss_get_ie - Fetch a specified information element from a BSS entry
925 * @bss: BSS table entry
926 * @ie: Information element identitifier (WLAN_EID_*)
927 * Returns: Pointer to the information element (id field) or %NULL if not found
929 * This function returns the first matching information element in the BSS
932 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
936 pos = (const u8 *) (bss + 1);
937 end = pos + bss->ie_len;
939 while (pos + 1 < end) {
940 if (pos + 2 + pos[1] > end)
952 * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry
953 * @bss: BSS table entry
954 * @vendor_type: Vendor type (four octets starting the IE payload)
955 * Returns: Pointer to the information element (id field) or %NULL if not found
957 * This function returns the first matching information element in the BSS
960 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
964 pos = (const u8 *) (bss + 1);
965 end = pos + bss->ie_len;
967 while (pos + 1 < end) {
968 if (pos + 2 + pos[1] > end)
970 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
971 vendor_type == WPA_GET_BE32(&pos[2]))
981 * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
982 * @bss: BSS table entry
983 * @vendor_type: Vendor type (four octets starting the IE payload)
984 * Returns: Pointer to the information element payload or %NULL if not found
986 * This function returns concatenated payload of possibly fragmented vendor
987 * specific information elements in the BSS entry. The caller is responsible for
988 * freeing the returned buffer.
990 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
996 buf = wpabuf_alloc(bss->ie_len);
1000 pos = (const u8 *) (bss + 1);
1001 end = pos + bss->ie_len;
1003 while (pos + 1 < end) {
1004 if (pos + 2 + pos[1] > end)
1006 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1007 vendor_type == WPA_GET_BE32(&pos[2]))
1008 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1012 if (wpabuf_len(buf) == 0) {
1022 * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry
1023 * @bss: BSS table entry
1024 * @vendor_type: Vendor type (four octets starting the IE payload)
1025 * Returns: Pointer to the information element payload or %NULL if not found
1027 * This function returns concatenated payload of possibly fragmented vendor
1028 * specific information elements in the BSS entry. The caller is responsible for
1029 * freeing the returned buffer.
1031 * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only
1032 * from Beacon frames instead of either Beacon or Probe Response frames.
1034 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
1038 const u8 *end, *pos;
1040 buf = wpabuf_alloc(bss->beacon_ie_len);
1044 pos = (const u8 *) (bss + 1);
1046 end = pos + bss->beacon_ie_len;
1048 while (pos + 1 < end) {
1049 if (pos + 2 + pos[1] > end)
1051 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1052 vendor_type == WPA_GET_BE32(&pos[2]))
1053 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
1057 if (wpabuf_len(buf) == 0) {
1067 * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS
1068 * @bss: BSS table entry
1069 * Returns: Maximum legacy rate in units of 500 kbps
1071 int wpa_bss_get_max_rate(const struct wpa_bss *bss)
1077 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1078 for (i = 0; ie && i < ie[1]; i++) {
1079 if ((ie[i + 2] & 0x7f) > rate)
1080 rate = ie[i + 2] & 0x7f;
1083 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1084 for (i = 0; ie && i < ie[1]; i++) {
1085 if ((ie[i + 2] & 0x7f) > rate)
1086 rate = ie[i + 2] & 0x7f;
1094 * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS
1095 * @bss: BSS table entry
1096 * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps)
1097 * Returns: number of legacy TX rates or -1 on failure
1099 * The caller is responsible for freeing the returned buffer with os_free() in
1102 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
1109 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1110 ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1112 len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
1118 for (i = 0; ie && i < ie[1]; i++)
1119 r[i] = ie[i + 2] & 0x7f;
1121 for (j = 0; ie2 && j < ie2[1]; j++)
1122 r[i + j] = ie2[j + 2] & 0x7f;