3 * Copyright (c) 2009-2019, 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 ANQP_DUP(fils_realm_info
);
97 #endif /* CONFIG_INTERWORKING */
99 ANQP_DUP(hs20_capability_list
);
100 ANQP_DUP(hs20_operator_friendly_name
);
101 ANQP_DUP(hs20_wan_metrics
);
102 ANQP_DUP(hs20_connection_capability
);
103 ANQP_DUP(hs20_operating_class
);
104 ANQP_DUP(hs20_osu_providers_list
);
105 ANQP_DUP(hs20_operator_icon_metadata
);
106 ANQP_DUP(hs20_osu_providers_nai_list
);
107 #endif /* CONFIG_HS20 */
115 * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry
117 * Returns: 0 on success, -1 on failure
119 * This function ensures the specific BSS entry has an ANQP data structure that
120 * is not shared with any other BSS entry.
122 int wpa_bss_anqp_unshare_alloc(struct wpa_bss
*bss
)
124 struct wpa_bss_anqp
*anqp
;
126 if (bss
->anqp
&& bss
->anqp
->users
> 1) {
127 /* allocated, but shared - clone an unshared copy */
128 anqp
= wpa_bss_anqp_clone(bss
->anqp
);
138 return 0; /* already allocated and not shared */
140 /* not allocated - allocate a new storage area */
141 bss
->anqp
= wpa_bss_anqp_alloc();
142 return bss
->anqp
? 0 : -1;
147 * wpa_bss_anqp_free - Free an ANQP data structure
148 * @anqp: ANQP data structure from wpa_bss_anqp_alloc() or wpa_bss_anqp_clone()
150 static void wpa_bss_anqp_free(struct wpa_bss_anqp
*anqp
)
152 #ifdef CONFIG_INTERWORKING
153 struct wpa_bss_anqp_elem
*elem
;
154 #endif /* CONFIG_INTERWORKING */
160 if (anqp
->users
> 0) {
161 /* Another BSS entry holds a pointer to this ANQP info */
165 #ifdef CONFIG_INTERWORKING
166 wpabuf_free(anqp
->capability_list
);
167 wpabuf_free(anqp
->venue_name
);
168 wpabuf_free(anqp
->network_auth_type
);
169 wpabuf_free(anqp
->roaming_consortium
);
170 wpabuf_free(anqp
->ip_addr_type_availability
);
171 wpabuf_free(anqp
->nai_realm
);
172 wpabuf_free(anqp
->anqp_3gpp
);
173 wpabuf_free(anqp
->domain_name
);
174 wpabuf_free(anqp
->fils_realm_info
);
176 while ((elem
= dl_list_first(&anqp
->anqp_elems
,
177 struct wpa_bss_anqp_elem
, list
))) {
178 dl_list_del(&elem
->list
);
179 wpabuf_free(elem
->payload
);
182 #endif /* CONFIG_INTERWORKING */
184 wpabuf_free(anqp
->hs20_capability_list
);
185 wpabuf_free(anqp
->hs20_operator_friendly_name
);
186 wpabuf_free(anqp
->hs20_wan_metrics
);
187 wpabuf_free(anqp
->hs20_connection_capability
);
188 wpabuf_free(anqp
->hs20_operating_class
);
189 wpabuf_free(anqp
->hs20_osu_providers_list
);
190 wpabuf_free(anqp
->hs20_operator_icon_metadata
);
191 wpabuf_free(anqp
->hs20_osu_providers_nai_list
);
192 #endif /* CONFIG_HS20 */
198 static void wpa_bss_update_pending_connect(struct wpa_supplicant
*wpa_s
,
199 struct wpa_bss
*old_bss
,
200 struct wpa_bss
*new_bss
)
202 struct wpa_radio_work
*work
;
203 struct wpa_connect_work
*cwork
;
205 work
= radio_work_pending(wpa_s
, "sme-connect");
207 work
= radio_work_pending(wpa_s
, "connect");
212 if (cwork
->bss
!= old_bss
)
215 wpa_printf(MSG_DEBUG
,
216 "Update BSS pointer for the pending connect radio work");
217 cwork
->bss
= new_bss
;
219 cwork
->bss_removed
= 1;
223 void wpa_bss_remove(struct wpa_supplicant
*wpa_s
, struct wpa_bss
*bss
,
226 if (wpa_s
->last_scan_res
) {
228 for (i
= 0; i
< wpa_s
->last_scan_res_used
; i
++) {
229 if (wpa_s
->last_scan_res
[i
] == bss
) {
230 os_memmove(&wpa_s
->last_scan_res
[i
],
231 &wpa_s
->last_scan_res
[i
+ 1],
232 (wpa_s
->last_scan_res_used
- i
- 1)
233 * sizeof(struct wpa_bss
*));
234 wpa_s
->last_scan_res_used
--;
239 wpa_bss_update_pending_connect(wpa_s
, bss
, NULL
);
240 dl_list_del(&bss
->list
);
241 dl_list_del(&bss
->list_id
);
243 wpa_dbg(wpa_s
, MSG_DEBUG
, "BSS: Remove id %u BSSID " MACSTR
244 " SSID '%s' due to %s", bss
->id
, MAC2STR(bss
->bssid
),
245 wpa_ssid_txt(bss
->ssid
, bss
->ssid_len
), reason
);
246 wpas_notify_bss_removed(wpa_s
, bss
->bssid
, bss
->id
);
247 wpa_bss_anqp_free(bss
->anqp
);
253 * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID
254 * @wpa_s: Pointer to wpa_supplicant data
257 * @ssid_len: Length of @ssid
258 * Returns: Pointer to the BSS entry or %NULL if not found
260 struct wpa_bss
* wpa_bss_get(struct wpa_supplicant
*wpa_s
, const u8
*bssid
,
261 const u8
*ssid
, size_t ssid_len
)
264 if (!wpa_supplicant_filter_bssid_match(wpa_s
, bssid
))
266 dl_list_for_each(bss
, &wpa_s
->bss
, struct wpa_bss
, list
) {
267 if (os_memcmp(bss
->bssid
, bssid
, ETH_ALEN
) == 0 &&
268 bss
->ssid_len
== ssid_len
&&
269 os_memcmp(bss
->ssid
, ssid
, ssid_len
) == 0)
276 void calculate_update_time(const struct os_reltime
*fetch_time
,
278 struct os_reltime
*update_time
)
282 update_time
->sec
= fetch_time
->sec
;
283 update_time
->usec
= fetch_time
->usec
;
284 update_time
->sec
-= age_ms
/ 1000;
285 usec
= (age_ms
% 1000) * 1000;
286 if (update_time
->usec
< usec
) {
288 update_time
->usec
+= 1000000;
290 update_time
->usec
-= usec
;
294 static void wpa_bss_copy_res(struct wpa_bss
*dst
, struct wpa_scan_res
*src
,
295 struct os_reltime
*fetch_time
)
297 dst
->flags
= src
->flags
;
298 os_memcpy(dst
->bssid
, src
->bssid
, ETH_ALEN
);
299 dst
->freq
= src
->freq
;
300 dst
->beacon_int
= src
->beacon_int
;
301 dst
->caps
= src
->caps
;
302 dst
->qual
= src
->qual
;
303 dst
->noise
= src
->noise
;
304 dst
->level
= src
->level
;
306 dst
->est_throughput
= src
->est_throughput
;
309 calculate_update_time(fetch_time
, src
->age
, &dst
->last_update
);
313 static int wpa_bss_is_wps_candidate(struct wpa_supplicant
*wpa_s
,
317 struct wpa_ssid
*ssid
;
318 struct wpabuf
*wps_ie
;
321 wps_ie
= wpa_bss_get_vendor_ie_multi(bss
, WPS_IE_VENDOR_TYPE
);
325 if (wps_is_selected_pbc_registrar(wps_ie
)) {
327 } else if (!wps_is_addr_authorized(wps_ie
, wpa_s
->own_addr
, 1)) {
332 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
333 if (!(ssid
->key_mgmt
& WPA_KEY_MGMT_WPS
))
335 if (ssid
->ssid_len
&&
336 (ssid
->ssid_len
!= bss
->ssid_len
||
337 os_memcmp(ssid
->ssid
, bss
->ssid
, ssid
->ssid_len
) != 0))
341 ret
= eap_is_wps_pbc_enrollee(&ssid
->eap
);
343 ret
= eap_is_wps_pin_enrollee(&ssid
->eap
);
348 #endif /* CONFIG_WPS */
354 static int wpa_bss_known(struct wpa_supplicant
*wpa_s
, struct wpa_bss
*bss
)
356 struct wpa_ssid
*ssid
;
358 for (ssid
= wpa_s
->conf
->ssid
; ssid
; ssid
= ssid
->next
) {
359 if (ssid
->ssid
== NULL
|| ssid
->ssid_len
== 0)
361 if (ssid
->ssid_len
== bss
->ssid_len
&&
362 os_memcmp(ssid
->ssid
, bss
->ssid
, ssid
->ssid_len
) == 0)
370 static int wpa_bss_in_use(struct wpa_supplicant
*wpa_s
, struct wpa_bss
*bss
)
372 if (bss
== wpa_s
->current_bss
)
375 if (wpa_s
->current_bss
&&
376 (bss
->ssid_len
!= wpa_s
->current_bss
->ssid_len
||
377 os_memcmp(bss
->ssid
, wpa_s
->current_bss
->ssid
,
378 bss
->ssid_len
) != 0))
379 return 0; /* SSID has changed */
381 return !is_zero_ether_addr(bss
->bssid
) &&
382 (os_memcmp(bss
->bssid
, wpa_s
->bssid
, ETH_ALEN
) == 0 ||
383 os_memcmp(bss
->bssid
, wpa_s
->pending_bssid
, ETH_ALEN
) == 0);
387 static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant
*wpa_s
)
391 dl_list_for_each(bss
, &wpa_s
->bss
, struct wpa_bss
, list
) {
392 if (!wpa_bss_known(wpa_s
, bss
) &&
393 !wpa_bss_is_wps_candidate(wpa_s
, bss
)) {
394 wpa_bss_remove(wpa_s
, bss
, __func__
);
403 static int wpa_bss_remove_oldest(struct wpa_supplicant
*wpa_s
)
408 * Remove the oldest entry that does not match with any configured
411 if (wpa_bss_remove_oldest_unknown(wpa_s
) == 0)
415 * Remove the oldest entry that isn't currently in use.
417 dl_list_for_each(bss
, &wpa_s
->bss
, struct wpa_bss
, list
) {
418 if (!wpa_bss_in_use(wpa_s
, bss
)) {
419 wpa_bss_remove(wpa_s
, bss
, __func__
);
428 static struct wpa_bss
* wpa_bss_add(struct wpa_supplicant
*wpa_s
,
429 const u8
*ssid
, size_t ssid_len
,
430 struct wpa_scan_res
*res
,
431 struct os_reltime
*fetch_time
)
436 bss
= os_zalloc(sizeof(*bss
) + res
->ie_len
+ res
->beacon_ie_len
);
439 bss
->id
= wpa_s
->bss_next_id
++;
440 bss
->last_update_idx
= wpa_s
->bss_update_idx
;
441 wpa_bss_copy_res(bss
, res
, fetch_time
);
442 os_memcpy(bss
->ssid
, ssid
, ssid_len
);
443 bss
->ssid_len
= ssid_len
;
444 bss
->ie_len
= res
->ie_len
;
445 bss
->beacon_ie_len
= res
->beacon_ie_len
;
446 os_memcpy(bss
+ 1, res
+ 1, res
->ie_len
+ res
->beacon_ie_len
);
447 wpa_bss_set_hessid(bss
);
449 if (wpa_s
->num_bss
+ 1 > wpa_s
->conf
->bss_max_count
&&
450 wpa_bss_remove_oldest(wpa_s
) != 0) {
451 wpa_printf(MSG_ERROR
, "Increasing the MAX BSS count to %d "
452 "because all BSSes are in use. We should normally "
453 "not get here!", (int) wpa_s
->num_bss
+ 1);
454 wpa_s
->conf
->bss_max_count
= wpa_s
->num_bss
+ 1;
457 dl_list_add_tail(&wpa_s
->bss
, &bss
->list
);
458 dl_list_add_tail(&wpa_s
->bss_id
, &bss
->list_id
);
460 if (!is_zero_ether_addr(bss
->hessid
))
461 os_snprintf(extra
, sizeof(extra
), " HESSID " MACSTR
,
462 MAC2STR(bss
->hessid
));
465 wpa_dbg(wpa_s
, MSG_DEBUG
, "BSS: Add new id %u BSSID " MACSTR
466 " SSID '%s' freq %d%s",
467 bss
->id
, MAC2STR(bss
->bssid
), wpa_ssid_txt(ssid
, ssid_len
),
469 wpas_notify_bss_added(wpa_s
, bss
->bssid
, bss
->id
);
474 static int are_ies_equal(const struct wpa_bss
*old
,
475 const struct wpa_scan_res
*new_res
, u32 ie
)
477 const u8
*old_ie
, *new_ie
;
478 struct wpabuf
*old_ie_buff
= NULL
;
479 struct wpabuf
*new_ie_buff
= NULL
;
480 int new_ie_len
, old_ie_len
, ret
, is_multi
;
483 case WPA_IE_VENDOR_TYPE
:
484 old_ie
= wpa_bss_get_vendor_ie(old
, ie
);
485 new_ie
= wpa_scan_get_vendor_ie(new_res
, ie
);
488 case WPS_IE_VENDOR_TYPE
:
489 old_ie_buff
= wpa_bss_get_vendor_ie_multi(old
, ie
);
490 new_ie_buff
= wpa_scan_get_vendor_ie_multi(new_res
, ie
);
494 case WLAN_EID_SUPP_RATES
:
495 case WLAN_EID_EXT_SUPP_RATES
:
496 old_ie
= wpa_bss_get_ie(old
, ie
);
497 new_ie
= wpa_scan_get_ie(new_res
, ie
);
501 wpa_printf(MSG_DEBUG
, "bss: %s: cannot compare IEs", __func__
);
506 /* in case of multiple IEs stored in buffer */
507 old_ie
= old_ie_buff
? wpabuf_head_u8(old_ie_buff
) : NULL
;
508 new_ie
= new_ie_buff
? wpabuf_head_u8(new_ie_buff
) : NULL
;
509 old_ie_len
= old_ie_buff
? wpabuf_len(old_ie_buff
) : 0;
510 new_ie_len
= new_ie_buff
? wpabuf_len(new_ie_buff
) : 0;
512 /* in case of single IE */
513 old_ie_len
= old_ie
? old_ie
[1] + 2 : 0;
514 new_ie_len
= new_ie
? new_ie
[1] + 2 : 0;
517 if (!old_ie
|| !new_ie
)
518 ret
= !old_ie
&& !new_ie
;
520 ret
= (old_ie_len
== new_ie_len
&&
521 os_memcmp(old_ie
, new_ie
, old_ie_len
) == 0);
523 wpabuf_free(old_ie_buff
);
524 wpabuf_free(new_ie_buff
);
530 static u32
wpa_bss_compare_res(const struct wpa_bss
*old
,
531 const struct wpa_scan_res
*new_res
)
534 int caps_diff
= old
->caps
^ new_res
->caps
;
536 if (old
->freq
!= new_res
->freq
)
537 changes
|= WPA_BSS_FREQ_CHANGED_FLAG
;
539 if (old
->level
!= new_res
->level
)
540 changes
|= WPA_BSS_SIGNAL_CHANGED_FLAG
;
542 if (caps_diff
& IEEE80211_CAP_PRIVACY
)
543 changes
|= WPA_BSS_PRIVACY_CHANGED_FLAG
;
545 if (caps_diff
& IEEE80211_CAP_IBSS
)
546 changes
|= WPA_BSS_MODE_CHANGED_FLAG
;
548 if (old
->ie_len
== new_res
->ie_len
&&
549 os_memcmp(old
+ 1, new_res
+ 1, old
->ie_len
) == 0)
551 changes
|= WPA_BSS_IES_CHANGED_FLAG
;
553 if (!are_ies_equal(old
, new_res
, WPA_IE_VENDOR_TYPE
))
554 changes
|= WPA_BSS_WPAIE_CHANGED_FLAG
;
556 if (!are_ies_equal(old
, new_res
, WLAN_EID_RSN
))
557 changes
|= WPA_BSS_RSNIE_CHANGED_FLAG
;
559 if (!are_ies_equal(old
, new_res
, WPS_IE_VENDOR_TYPE
))
560 changes
|= WPA_BSS_WPS_CHANGED_FLAG
;
562 if (!are_ies_equal(old
, new_res
, WLAN_EID_SUPP_RATES
) ||
563 !are_ies_equal(old
, new_res
, WLAN_EID_EXT_SUPP_RATES
))
564 changes
|= WPA_BSS_RATES_CHANGED_FLAG
;
570 static void notify_bss_changes(struct wpa_supplicant
*wpa_s
, u32 changes
,
571 const struct wpa_bss
*bss
)
573 if (changes
& WPA_BSS_FREQ_CHANGED_FLAG
)
574 wpas_notify_bss_freq_changed(wpa_s
, bss
->id
);
576 if (changes
& WPA_BSS_SIGNAL_CHANGED_FLAG
)
577 wpas_notify_bss_signal_changed(wpa_s
, bss
->id
);
579 if (changes
& WPA_BSS_PRIVACY_CHANGED_FLAG
)
580 wpas_notify_bss_privacy_changed(wpa_s
, bss
->id
);
582 if (changes
& WPA_BSS_MODE_CHANGED_FLAG
)
583 wpas_notify_bss_mode_changed(wpa_s
, bss
->id
);
585 if (changes
& WPA_BSS_WPAIE_CHANGED_FLAG
)
586 wpas_notify_bss_wpaie_changed(wpa_s
, bss
->id
);
588 if (changes
& WPA_BSS_RSNIE_CHANGED_FLAG
)
589 wpas_notify_bss_rsnie_changed(wpa_s
, bss
->id
);
591 if (changes
& WPA_BSS_WPS_CHANGED_FLAG
)
592 wpas_notify_bss_wps_changed(wpa_s
, bss
->id
);
594 if (changes
& WPA_BSS_IES_CHANGED_FLAG
)
595 wpas_notify_bss_ies_changed(wpa_s
, bss
->id
);
597 if (changes
& WPA_BSS_RATES_CHANGED_FLAG
)
598 wpas_notify_bss_rates_changed(wpa_s
, bss
->id
);
600 wpas_notify_bss_seen(wpa_s
, bss
->id
);
604 static struct wpa_bss
*
605 wpa_bss_update(struct wpa_supplicant
*wpa_s
, struct wpa_bss
*bss
,
606 struct wpa_scan_res
*res
, struct os_reltime
*fetch_time
)
610 if (bss
->last_update_idx
== wpa_s
->bss_update_idx
) {
611 struct os_reltime update_time
;
614 * Some drivers (e.g., cfg80211) include multiple BSS entries
615 * for the same BSS if that BSS's channel changes. The BSS list
616 * implementation in wpa_supplicant does not do that and we need
617 * to filter out the obsolete results here to make sure only the
618 * most current BSS information remains in the table.
620 wpa_printf(MSG_DEBUG
, "BSS: " MACSTR
621 " has multiple entries in the scan results - select the most current one",
622 MAC2STR(bss
->bssid
));
623 calculate_update_time(fetch_time
, res
->age
, &update_time
);
624 wpa_printf(MSG_DEBUG
,
625 "Previous last_update: %u.%06u (freq %d%s)",
626 (unsigned int) bss
->last_update
.sec
,
627 (unsigned int) bss
->last_update
.usec
,
629 (bss
->flags
& WPA_BSS_ASSOCIATED
) ? " assoc" : "");
630 wpa_printf(MSG_DEBUG
, "New last_update: %u.%06u (freq %d%s)",
631 (unsigned int) update_time
.sec
,
632 (unsigned int) update_time
.usec
,
634 (res
->flags
& WPA_SCAN_ASSOCIATED
) ? " assoc" : "");
635 if ((bss
->flags
& WPA_BSS_ASSOCIATED
) ||
636 (!(res
->flags
& WPA_SCAN_ASSOCIATED
) &&
637 !os_reltime_before(&bss
->last_update
, &update_time
))) {
638 wpa_printf(MSG_DEBUG
,
639 "Ignore this BSS entry since the previous update looks more current");
642 wpa_printf(MSG_DEBUG
,
643 "Accept this BSS entry since it looks more current than the previous update");
646 changes
= wpa_bss_compare_res(bss
, res
);
647 if (changes
& WPA_BSS_FREQ_CHANGED_FLAG
)
648 wpa_printf(MSG_DEBUG
, "BSS: " MACSTR
" changed freq %d --> %d",
649 MAC2STR(bss
->bssid
), bss
->freq
, res
->freq
);
650 bss
->scan_miss_count
= 0;
651 bss
->last_update_idx
= wpa_s
->bss_update_idx
;
652 wpa_bss_copy_res(bss
, res
, fetch_time
);
653 /* Move the entry to the end of the list */
654 dl_list_del(&bss
->list
);
656 if (wpa_bss_get_vendor_ie(bss
, P2P_IE_VENDOR_TYPE
) &&
657 !wpa_scan_get_vendor_ie(res
, P2P_IE_VENDOR_TYPE
)) {
659 * This can happen when non-P2P station interface runs a scan
660 * without P2P IE in the Probe Request frame. P2P GO would reply
661 * to that with a Probe Response that does not include P2P IE.
662 * Do not update the IEs in this BSS entry to avoid such loss of
663 * information that may be needed for P2P operations to
664 * determine group information.
666 wpa_dbg(wpa_s
, MSG_DEBUG
, "BSS: Do not update scan IEs for "
667 MACSTR
" since that would remove P2P IE information",
668 MAC2STR(bss
->bssid
));
670 #endif /* CONFIG_P2P */
671 if (bss
->ie_len
+ bss
->beacon_ie_len
>=
672 res
->ie_len
+ res
->beacon_ie_len
) {
673 os_memcpy(bss
+ 1, res
+ 1, res
->ie_len
+ res
->beacon_ie_len
);
674 bss
->ie_len
= res
->ie_len
;
675 bss
->beacon_ie_len
= res
->beacon_ie_len
;
677 struct wpa_bss
*nbss
;
678 struct dl_list
*prev
= bss
->list_id
.prev
;
679 dl_list_del(&bss
->list_id
);
680 nbss
= os_realloc(bss
, sizeof(*bss
) + res
->ie_len
+
684 for (i
= 0; i
< wpa_s
->last_scan_res_used
; i
++) {
685 if (wpa_s
->last_scan_res
[i
] == bss
) {
686 wpa_s
->last_scan_res
[i
] = nbss
;
690 if (wpa_s
->current_bss
== bss
)
691 wpa_s
->current_bss
= nbss
;
692 wpa_bss_update_pending_connect(wpa_s
, bss
, nbss
);
694 os_memcpy(bss
+ 1, res
+ 1,
695 res
->ie_len
+ res
->beacon_ie_len
);
696 bss
->ie_len
= res
->ie_len
;
697 bss
->beacon_ie_len
= res
->beacon_ie_len
;
699 dl_list_add(prev
, &bss
->list_id
);
701 if (changes
& WPA_BSS_IES_CHANGED_FLAG
)
702 wpa_bss_set_hessid(bss
);
703 dl_list_add_tail(&wpa_s
->bss
, &bss
->list
);
705 notify_bss_changes(wpa_s
, changes
, bss
);
712 * wpa_bss_update_start - Start a BSS table update from scan results
713 * @wpa_s: Pointer to wpa_supplicant data
715 * This function is called at the start of each BSS table update round for new
716 * scan results. The actual scan result entries are indicated with calls to
717 * wpa_bss_update_scan_res() and the update round is finished with a call to
718 * wpa_bss_update_end().
720 void wpa_bss_update_start(struct wpa_supplicant
*wpa_s
)
722 wpa_s
->bss_update_idx
++;
723 wpa_dbg(wpa_s
, MSG_DEBUG
, "BSS: Start scan result update %u",
724 wpa_s
->bss_update_idx
);
725 wpa_s
->last_scan_res_used
= 0;
730 * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
731 * @wpa_s: Pointer to wpa_supplicant data
733 * @fetch_time: Time when the result was fetched from the driver
735 * This function updates a BSS table entry (or adds one) based on a scan result.
736 * This is called separately for each scan result between the calls to
737 * wpa_bss_update_start() and wpa_bss_update_end().
739 void wpa_bss_update_scan_res(struct wpa_supplicant
*wpa_s
,
740 struct wpa_scan_res
*res
,
741 struct os_reltime
*fetch_time
)
743 const u8
*ssid
, *p2p
, *mesh
;
746 if (wpa_s
->conf
->ignore_old_scan_res
) {
747 struct os_reltime update
;
748 calculate_update_time(fetch_time
, res
->age
, &update
);
749 if (os_reltime_before(&update
, &wpa_s
->scan_trigger_time
)) {
750 struct os_reltime age
;
751 os_reltime_sub(&wpa_s
->scan_trigger_time
, &update
,
753 wpa_dbg(wpa_s
, MSG_DEBUG
, "BSS: Ignore driver BSS "
754 "table entry that is %u.%06u seconds older "
755 "than our scan trigger",
756 (unsigned int) age
.sec
,
757 (unsigned int) age
.usec
);
762 ssid
= wpa_scan_get_ie(res
, WLAN_EID_SSID
);
764 wpa_dbg(wpa_s
, MSG_DEBUG
, "BSS: No SSID IE included for "
765 MACSTR
, MAC2STR(res
->bssid
));
768 if (ssid
[1] > SSID_MAX_LEN
) {
769 wpa_dbg(wpa_s
, MSG_DEBUG
, "BSS: Too long SSID IE included for "
770 MACSTR
, MAC2STR(res
->bssid
));
774 p2p
= wpa_scan_get_vendor_ie(res
, P2P_IE_VENDOR_TYPE
);
777 wpa_s
->p2p_group_interface
!= NOT_P2P_GROUP_INTERFACE
) {
779 * If it's a P2P specific interface, then don't update
780 * the scan result without a P2P IE.
782 wpa_printf(MSG_DEBUG
, "BSS: No P2P IE - skipping BSS " MACSTR
783 " update for P2P interface", MAC2STR(res
->bssid
));
786 #endif /* CONFIG_P2P */
787 if (p2p
&& ssid
[1] == P2P_WILDCARD_SSID_LEN
&&
788 os_memcmp(ssid
+ 2, P2P_WILDCARD_SSID
, P2P_WILDCARD_SSID_LEN
) == 0)
789 return; /* Skip P2P listen discovery results here */
791 /* TODO: add option for ignoring BSSes we are not interested in
792 * (to save memory) */
794 mesh
= wpa_scan_get_ie(res
, WLAN_EID_MESH_ID
);
795 if (mesh
&& mesh
[1] <= SSID_MAX_LEN
)
798 bss
= wpa_bss_get(wpa_s
, res
->bssid
, ssid
+ 2, ssid
[1]);
800 bss
= wpa_bss_add(wpa_s
, ssid
+ 2, ssid
[1], res
, fetch_time
);
802 bss
= wpa_bss_update(wpa_s
, bss
, res
, fetch_time
);
803 if (wpa_s
->last_scan_res
) {
805 for (i
= 0; i
< wpa_s
->last_scan_res_used
; i
++) {
806 if (bss
== wpa_s
->last_scan_res
[i
]) {
807 /* Already in the list */
816 if (wpa_s
->last_scan_res_used
>= wpa_s
->last_scan_res_size
) {
819 if (wpa_s
->last_scan_res_size
== 0)
822 siz
= wpa_s
->last_scan_res_size
* 2;
823 n
= os_realloc_array(wpa_s
->last_scan_res
, siz
,
824 sizeof(struct wpa_bss
*));
827 wpa_s
->last_scan_res
= n
;
828 wpa_s
->last_scan_res_size
= siz
;
831 if (wpa_s
->last_scan_res
)
832 wpa_s
->last_scan_res
[wpa_s
->last_scan_res_used
++] = bss
;
836 static int wpa_bss_included_in_scan(const struct wpa_bss
*bss
,
837 const struct scan_info
*info
)
845 if (info
->num_freqs
) {
847 for (i
= 0; i
< info
->num_freqs
; i
++) {
848 if (bss
->freq
== info
->freqs
[i
]) {
857 if (info
->num_ssids
) {
859 for (i
= 0; i
< info
->num_ssids
; i
++) {
860 const struct wpa_driver_scan_ssid
*s
= &info
->ssids
[i
];
861 if ((s
->ssid
== NULL
|| s
->ssid_len
== 0) ||
862 (s
->ssid_len
== bss
->ssid_len
&&
863 os_memcmp(s
->ssid
, bss
->ssid
, bss
->ssid_len
) ==
878 * wpa_bss_update_end - End a BSS table update from scan results
879 * @wpa_s: Pointer to wpa_supplicant data
880 * @info: Information about scan parameters
881 * @new_scan: Whether this update round was based on a new scan
883 * This function is called at the end of each BSS table update round for new
884 * scan results. The start of the update was indicated with a call to
885 * wpa_bss_update_start().
887 void wpa_bss_update_end(struct wpa_supplicant
*wpa_s
, struct scan_info
*info
,
890 struct wpa_bss
*bss
, *n
;
892 os_get_reltime(&wpa_s
->last_scan
);
893 if ((info
&& info
->aborted
) || !new_scan
)
894 return; /* do not expire entries without new scan */
896 dl_list_for_each_safe(bss
, n
, &wpa_s
->bss
, struct wpa_bss
, list
) {
897 if (wpa_bss_in_use(wpa_s
, bss
))
899 if (!wpa_bss_included_in_scan(bss
, info
))
900 continue; /* expire only BSSes that were scanned */
901 if (bss
->last_update_idx
< wpa_s
->bss_update_idx
)
902 bss
->scan_miss_count
++;
903 if (bss
->scan_miss_count
>=
904 wpa_s
->conf
->bss_expiration_scan_count
) {
905 wpa_bss_remove(wpa_s
, bss
, "no match in scan");
909 wpa_printf(MSG_DEBUG
, "BSS: last_scan_res_used=%u/%u",
910 wpa_s
->last_scan_res_used
, wpa_s
->last_scan_res_size
);
915 * wpa_bss_flush_by_age - Flush old BSS entries
916 * @wpa_s: Pointer to wpa_supplicant data
917 * @age: Maximum entry age in seconds
919 * Remove BSS entries that have not been updated during the last @age seconds.
921 void wpa_bss_flush_by_age(struct wpa_supplicant
*wpa_s
, int age
)
923 struct wpa_bss
*bss
, *n
;
926 if (dl_list_empty(&wpa_s
->bss
))
932 dl_list_for_each_safe(bss
, n
, &wpa_s
->bss
, struct wpa_bss
, list
) {
933 if (wpa_bss_in_use(wpa_s
, bss
))
936 if (os_reltime_before(&bss
->last_update
, &t
)) {
937 wpa_bss_remove(wpa_s
, bss
, __func__
);
945 * wpa_bss_init - Initialize BSS table
946 * @wpa_s: Pointer to wpa_supplicant data
947 * Returns: 0 on success, -1 on failure
949 * This prepares BSS table lists and timer for periodic updates. The BSS table
950 * is deinitialized with wpa_bss_deinit() once not needed anymore.
952 int wpa_bss_init(struct wpa_supplicant
*wpa_s
)
954 dl_list_init(&wpa_s
->bss
);
955 dl_list_init(&wpa_s
->bss_id
);
961 * wpa_bss_flush - Flush all unused BSS entries
962 * @wpa_s: Pointer to wpa_supplicant data
964 void wpa_bss_flush(struct wpa_supplicant
*wpa_s
)
966 struct wpa_bss
*bss
, *n
;
968 wpa_s
->clear_driver_scan_cache
= 1;
970 if (wpa_s
->bss
.next
== NULL
)
971 return; /* BSS table not yet initialized */
973 dl_list_for_each_safe(bss
, n
, &wpa_s
->bss
, struct wpa_bss
, list
) {
974 if (wpa_bss_in_use(wpa_s
, bss
))
976 wpa_bss_remove(wpa_s
, bss
, __func__
);
982 * wpa_bss_deinit - Deinitialize BSS table
983 * @wpa_s: Pointer to wpa_supplicant data
985 void wpa_bss_deinit(struct wpa_supplicant
*wpa_s
)
987 wpa_bss_flush(wpa_s
);
992 * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
993 * @wpa_s: Pointer to wpa_supplicant data
995 * Returns: Pointer to the BSS entry or %NULL if not found
997 struct wpa_bss
* wpa_bss_get_bssid(struct wpa_supplicant
*wpa_s
,
1000 struct wpa_bss
*bss
;
1001 if (!wpa_supplicant_filter_bssid_match(wpa_s
, bssid
))
1003 dl_list_for_each_reverse(bss
, &wpa_s
->bss
, struct wpa_bss
, list
) {
1004 if (os_memcmp(bss
->bssid
, bssid
, ETH_ALEN
) == 0)
1012 * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
1013 * @wpa_s: Pointer to wpa_supplicant data
1015 * Returns: Pointer to the BSS entry or %NULL if not found
1017 * This function is like wpa_bss_get_bssid(), but full BSS table is iterated to
1018 * find the entry that has the most recent update. This can help in finding the
1019 * correct entry in cases where the SSID of the AP may have changed recently
1020 * (e.g., in WPS reconfiguration cases).
1022 struct wpa_bss
* wpa_bss_get_bssid_latest(struct wpa_supplicant
*wpa_s
,
1025 struct wpa_bss
*bss
, *found
= NULL
;
1026 if (!wpa_supplicant_filter_bssid_match(wpa_s
, bssid
))
1028 dl_list_for_each_reverse(bss
, &wpa_s
->bss
, struct wpa_bss
, list
) {
1029 if (os_memcmp(bss
->bssid
, bssid
, ETH_ALEN
) != 0)
1031 if (found
== NULL
||
1032 os_reltime_before(&found
->last_update
, &bss
->last_update
))
1041 * wpa_bss_get_p2p_dev_addr - Fetch a BSS table entry based on P2P Device Addr
1042 * @wpa_s: Pointer to wpa_supplicant data
1043 * @dev_addr: P2P Device Address of the GO
1044 * Returns: Pointer to the BSS entry or %NULL if not found
1046 struct wpa_bss
* wpa_bss_get_p2p_dev_addr(struct wpa_supplicant
*wpa_s
,
1049 struct wpa_bss
*bss
;
1050 dl_list_for_each_reverse(bss
, &wpa_s
->bss
, struct wpa_bss
, list
) {
1052 if (p2p_parse_dev_addr((const u8
*) (bss
+ 1), bss
->ie_len
,
1054 os_memcmp(addr
, dev_addr
, ETH_ALEN
) == 0)
1059 #endif /* CONFIG_P2P */
1063 * wpa_bss_get_id - Fetch a BSS table entry based on identifier
1064 * @wpa_s: Pointer to wpa_supplicant data
1065 * @id: Unique identifier (struct wpa_bss::id) assigned for the entry
1066 * Returns: Pointer to the BSS entry or %NULL if not found
1068 struct wpa_bss
* wpa_bss_get_id(struct wpa_supplicant
*wpa_s
, unsigned int id
)
1070 struct wpa_bss
*bss
;
1071 dl_list_for_each(bss
, &wpa_s
->bss
, struct wpa_bss
, list
) {
1080 * wpa_bss_get_id_range - Fetch a BSS table entry based on identifier range
1081 * @wpa_s: Pointer to wpa_supplicant data
1082 * @idf: Smallest allowed identifier assigned for the entry
1083 * @idf: Largest allowed identifier assigned for the entry
1084 * Returns: Pointer to the BSS entry or %NULL if not found
1086 * This function is similar to wpa_bss_get_id() but allows a BSS entry with the
1087 * smallest id value to be fetched within the specified range without the
1088 * caller having to know the exact id.
1090 struct wpa_bss
* wpa_bss_get_id_range(struct wpa_supplicant
*wpa_s
,
1091 unsigned int idf
, unsigned int idl
)
1093 struct wpa_bss
*bss
;
1094 dl_list_for_each(bss
, &wpa_s
->bss_id
, struct wpa_bss
, list_id
) {
1095 if (bss
->id
>= idf
&& bss
->id
<= idl
)
1103 * wpa_bss_get_ie - Fetch a specified information element from a BSS entry
1104 * @bss: BSS table entry
1105 * @ie: Information element identitifier (WLAN_EID_*)
1106 * Returns: Pointer to the information element (id field) or %NULL if not found
1108 * This function returns the first matching information element in the BSS
1111 const u8
* wpa_bss_get_ie(const struct wpa_bss
*bss
, u8 ie
)
1113 return get_ie((const u8
*) (bss
+ 1), bss
->ie_len
, ie
);
1118 * wpa_bss_get_vendor_ie - Fetch a vendor information element from a BSS entry
1119 * @bss: BSS table entry
1120 * @vendor_type: Vendor type (four octets starting the IE payload)
1121 * Returns: Pointer to the information element (id field) or %NULL if not found
1123 * This function returns the first matching information element in the BSS
1126 const u8
* wpa_bss_get_vendor_ie(const struct wpa_bss
*bss
, u32 vendor_type
)
1128 const u8
*end
, *pos
;
1130 pos
= (const u8
*) (bss
+ 1);
1131 end
= pos
+ bss
->ie_len
;
1133 while (end
- pos
> 1) {
1134 if (2 + pos
[1] > end
- pos
)
1136 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1137 vendor_type
== WPA_GET_BE32(&pos
[2]))
1147 * wpa_bss_get_vendor_ie_beacon - Fetch a vendor information from a BSS entry
1148 * @bss: BSS table entry
1149 * @vendor_type: Vendor type (four octets starting the IE payload)
1150 * Returns: Pointer to the information element (id field) or %NULL if not found
1152 * This function returns the first matching information element in the BSS
1155 * This function is like wpa_bss_get_vendor_ie(), but uses IE buffer only
1156 * from Beacon frames instead of either Beacon or Probe Response frames.
1158 const u8
* wpa_bss_get_vendor_ie_beacon(const struct wpa_bss
*bss
,
1161 const u8
*end
, *pos
;
1163 if (bss
->beacon_ie_len
== 0)
1166 pos
= (const u8
*) (bss
+ 1);
1168 end
= pos
+ bss
->beacon_ie_len
;
1170 while (end
- pos
> 1) {
1171 if (2 + pos
[1] > end
- pos
)
1173 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1174 vendor_type
== WPA_GET_BE32(&pos
[2]))
1184 * wpa_bss_get_vendor_ie_multi - Fetch vendor IE data from a BSS entry
1185 * @bss: BSS table entry
1186 * @vendor_type: Vendor type (four octets starting the IE payload)
1187 * Returns: Pointer to the information element payload or %NULL if not found
1189 * This function returns concatenated payload of possibly fragmented vendor
1190 * specific information elements in the BSS entry. The caller is responsible for
1191 * freeing the returned buffer.
1193 struct wpabuf
* wpa_bss_get_vendor_ie_multi(const struct wpa_bss
*bss
,
1197 const u8
*end
, *pos
;
1199 buf
= wpabuf_alloc(bss
->ie_len
);
1203 pos
= (const u8
*) (bss
+ 1);
1204 end
= pos
+ bss
->ie_len
;
1206 while (end
- pos
> 1) {
1207 if (2 + pos
[1] > end
- pos
)
1209 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1210 vendor_type
== WPA_GET_BE32(&pos
[2]))
1211 wpabuf_put_data(buf
, pos
+ 2 + 4, pos
[1] - 4);
1215 if (wpabuf_len(buf
) == 0) {
1225 * wpa_bss_get_vendor_ie_multi_beacon - Fetch vendor IE data from a BSS entry
1226 * @bss: BSS table entry
1227 * @vendor_type: Vendor type (four octets starting the IE payload)
1228 * Returns: Pointer to the information element payload or %NULL if not found
1230 * This function returns concatenated payload of possibly fragmented vendor
1231 * specific information elements in the BSS entry. The caller is responsible for
1232 * freeing the returned buffer.
1234 * This function is like wpa_bss_get_vendor_ie_multi(), but uses IE buffer only
1235 * from Beacon frames instead of either Beacon or Probe Response frames.
1237 struct wpabuf
* wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss
*bss
,
1241 const u8
*end
, *pos
;
1243 buf
= wpabuf_alloc(bss
->beacon_ie_len
);
1247 pos
= (const u8
*) (bss
+ 1);
1249 end
= pos
+ bss
->beacon_ie_len
;
1251 while (end
- pos
> 1) {
1252 if (2 + pos
[1] > end
- pos
)
1254 if (pos
[0] == WLAN_EID_VENDOR_SPECIFIC
&& pos
[1] >= 4 &&
1255 vendor_type
== WPA_GET_BE32(&pos
[2]))
1256 wpabuf_put_data(buf
, pos
+ 2 + 4, pos
[1] - 4);
1260 if (wpabuf_len(buf
) == 0) {
1270 * wpa_bss_get_max_rate - Get maximum legacy TX rate supported in a BSS
1271 * @bss: BSS table entry
1272 * Returns: Maximum legacy rate in units of 500 kbps
1274 int wpa_bss_get_max_rate(const struct wpa_bss
*bss
)
1280 ie
= wpa_bss_get_ie(bss
, WLAN_EID_SUPP_RATES
);
1281 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1282 if ((ie
[i
+ 2] & 0x7f) > rate
)
1283 rate
= ie
[i
+ 2] & 0x7f;
1286 ie
= wpa_bss_get_ie(bss
, WLAN_EID_EXT_SUPP_RATES
);
1287 for (i
= 0; ie
&& i
< ie
[1]; i
++) {
1288 if ((ie
[i
+ 2] & 0x7f) > rate
)
1289 rate
= ie
[i
+ 2] & 0x7f;
1297 * wpa_bss_get_bit_rates - Get legacy TX rates supported in a BSS
1298 * @bss: BSS table entry
1299 * @rates: Buffer for returning a pointer to the rates list (units of 500 kbps)
1300 * Returns: number of legacy TX rates or -1 on failure
1302 * The caller is responsible for freeing the returned buffer with os_free() in
1305 int wpa_bss_get_bit_rates(const struct wpa_bss
*bss
, u8
**rates
)
1312 ie
= wpa_bss_get_ie(bss
, WLAN_EID_SUPP_RATES
);
1313 ie2
= wpa_bss_get_ie(bss
, WLAN_EID_EXT_SUPP_RATES
);
1315 len
= (ie
? ie
[1] : 0) + (ie2
? ie2
[1] : 0);
1321 for (i
= 0; ie
&& i
< ie
[1]; i
++)
1322 r
[i
] = ie
[i
+ 2] & 0x7f;
1324 for (j
= 0; ie2
&& j
< ie2
[1]; j
++)
1325 r
[i
+ j
] = ie2
[j
+ 2] & 0x7f;
1333 const u8
* wpa_bss_get_fils_cache_id(struct wpa_bss
*bss
)
1338 ie
= wpa_bss_get_ie(bss
, WLAN_EID_FILS_INDICATION
);
1339 if (ie
&& ie
[1] >= 4 && WPA_GET_LE16(ie
+ 2) & BIT(7))
1345 #endif /* CONFIG_FILS */
1348 int wpa_bss_ext_capab(const struct wpa_bss
*bss
, unsigned int capab
)
1350 return ieee802_11_ext_capab(wpa_bss_get_ie(bss
, WLAN_EID_EXT_CAPAB
),