1 /*
2 * BSS table
3 * Copyright (c) 2009-2019, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
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"
17 #include "config.h"
18 #include "notify.h"
19 #include "scan.h"
20 #include "bss.h"
21
22
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)
32
33
wpa_bss_set_hessid(struct wpa_bss * bss)34 static void wpa_bss_set_hessid(struct wpa_bss *bss)
35 {
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);
40 return;
41 }
42 if (ie[1] == 7)
43 os_memcpy(bss->hessid, ie + 3, ETH_ALEN);
44 else
45 os_memcpy(bss->hessid, ie + 5, ETH_ALEN);
46 #endif /* CONFIG_INTERWORKING */
47 }
48
49
50 /**
51 * wpa_bss_anqp_alloc - Allocate ANQP data structure for a BSS entry
52 * Returns: Allocated ANQP data structure or %NULL on failure
53 *
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().
57 */
wpa_bss_anqp_alloc(void)58 struct wpa_bss_anqp * wpa_bss_anqp_alloc(void)
59 {
60 struct wpa_bss_anqp *anqp;
61 anqp = os_zalloc(sizeof(*anqp));
62 if (anqp == NULL)
63 return NULL;
64 #ifdef CONFIG_INTERWORKING
65 dl_list_init(&anqp->anqp_elems);
66 #endif /* CONFIG_INTERWORKING */
67 anqp->users = 1;
68 return anqp;
69 }
70
71
72 /**
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
76 */
wpa_bss_anqp_clone(struct wpa_bss_anqp * anqp)77 static struct wpa_bss_anqp * wpa_bss_anqp_clone(struct wpa_bss_anqp *anqp)
78 {
79 struct wpa_bss_anqp *n;
80
81 n = os_zalloc(sizeof(*n));
82 if (n == NULL)
83 return NULL;
84
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);
89 ANQP_DUP(venue_name);
90 ANQP_DUP(network_auth_type);
91 ANQP_DUP(roaming_consortium);
92 ANQP_DUP(ip_addr_type_availability);
93 ANQP_DUP(nai_realm);
94 ANQP_DUP(anqp_3gpp);
95 ANQP_DUP(domain_name);
96 ANQP_DUP(fils_realm_info);
97 #endif /* CONFIG_INTERWORKING */
98 #ifdef CONFIG_HS20
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 */
108 #undef ANQP_DUP
109
110 return n;
111 }
112
113
114 /**
115 * wpa_bss_anqp_unshare_alloc - Unshare ANQP data (if shared) in a BSS entry
116 * @bss: BSS entry
117 * Returns: 0 on success, -1 on failure
118 *
119 * This function ensures the specific BSS entry has an ANQP data structure that
120 * is not shared with any other BSS entry.
121 */
wpa_bss_anqp_unshare_alloc(struct wpa_bss * bss)122 int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss)
123 {
124 struct wpa_bss_anqp *anqp;
125
126 if (bss->anqp && bss->anqp->users > 1) {
127 /* allocated, but shared - clone an unshared copy */
128 anqp = wpa_bss_anqp_clone(bss->anqp);
129 if (anqp == NULL)
130 return -1;
131 anqp->users = 1;
132 bss->anqp->users--;
133 bss->anqp = anqp;
134 return 0;
135 }
136
137 if (bss->anqp)
138 return 0; /* already allocated and not shared */
139
140 /* not allocated - allocate a new storage area */
141 bss->anqp = wpa_bss_anqp_alloc();
142 return bss->anqp ? 0 : -1;
143 }
144
145
146 /**
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()
149 */
wpa_bss_anqp_free(struct wpa_bss_anqp * anqp)150 static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp)
151 {
152 #ifdef CONFIG_INTERWORKING
153 struct wpa_bss_anqp_elem *elem;
154 #endif /* CONFIG_INTERWORKING */
155
156 if (anqp == NULL)
157 return;
158
159 anqp->users--;
160 if (anqp->users > 0) {
161 /* Another BSS entry holds a pointer to this ANQP info */
162 return;
163 }
164
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);
175
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);
180 os_free(elem);
181 }
182 #endif /* CONFIG_INTERWORKING */
183 #ifdef CONFIG_HS20
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 */
193
194 os_free(anqp);
195 }
196
197
wpa_bss_update_pending_connect(struct wpa_supplicant * wpa_s,struct wpa_bss * old_bss,struct wpa_bss * new_bss)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)
201 {
202 struct wpa_radio_work *work;
203 struct wpa_connect_work *cwork;
204
205 work = radio_work_pending(wpa_s, "sme-connect");
206 if (!work)
207 work = radio_work_pending(wpa_s, "connect");
208 if (!work)
209 return;
210
211 cwork = work->ctx;
212 if (cwork->bss != old_bss)
213 return;
214
215 wpa_printf(MSG_DEBUG,
216 "Update BSS pointer for the pending connect radio work");
217 cwork->bss = new_bss;
218 if (!new_bss)
219 cwork->bss_removed = 1;
220 }
221
222
wpa_bss_remove(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,const char * reason)223 void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
224 const char *reason)
225 {
226 if (wpa_s->last_scan_res) {
227 unsigned int i;
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--;
235 break;
236 }
237 }
238 }
239 wpa_bss_update_pending_connect(wpa_s, bss, NULL);
240 dl_list_del(&bss->list);
241 dl_list_del(&bss->list_id);
242 wpa_s->num_bss--;
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);
248 os_free(bss);
249 }
250
251
252 /**
253 * wpa_bss_get - Fetch a BSS table entry based on BSSID and SSID
254 * @wpa_s: Pointer to wpa_supplicant data
255 * @bssid: BSSID
256 * @ssid: SSID
257 * @ssid_len: Length of @ssid
258 * Returns: Pointer to the BSS entry or %NULL if not found
259 */
wpa_bss_get(struct wpa_supplicant * wpa_s,const u8 * bssid,const u8 * ssid,size_t ssid_len)260 struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
261 const u8 *ssid, size_t ssid_len)
262 {
263 struct wpa_bss *bss;
264 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
265 return NULL;
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)
270 return bss;
271 }
272 return NULL;
273 }
274
275
calculate_update_time(const struct os_reltime * fetch_time,unsigned int age_ms,struct os_reltime * update_time)276 void calculate_update_time(const struct os_reltime *fetch_time,
277 unsigned int age_ms,
278 struct os_reltime *update_time)
279 {
280 os_time_t usec;
281
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) {
287 update_time->sec--;
288 update_time->usec += 1000000;
289 }
290 update_time->usec -= usec;
291 }
292
293
wpa_bss_copy_res(struct wpa_bss * dst,struct wpa_scan_res * src,struct os_reltime * fetch_time)294 static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src,
295 struct os_reltime *fetch_time)
296 {
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;
305 dst->tsf = src->tsf;
306 dst->est_throughput = src->est_throughput;
307 dst->snr = src->snr;
308
309 calculate_update_time(fetch_time, src->age, &dst->last_update);
310 }
311
312
wpa_bss_is_wps_candidate(struct wpa_supplicant * wpa_s,struct wpa_bss * bss)313 static int wpa_bss_is_wps_candidate(struct wpa_supplicant *wpa_s,
314 struct wpa_bss *bss)
315 {
316 #ifdef CONFIG_WPS
317 struct wpa_ssid *ssid;
318 struct wpabuf *wps_ie;
319 int pbc = 0, ret;
320
321 wps_ie = wpa_bss_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
322 if (!wps_ie)
323 return 0;
324
325 if (wps_is_selected_pbc_registrar(wps_ie)) {
326 pbc = 1;
327 } else if (!wps_is_addr_authorized(wps_ie, wpa_s->own_addr, 1)) {
328 wpabuf_free(wps_ie);
329 return 0;
330 }
331
332 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
333 if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
334 continue;
335 if (ssid->ssid_len &&
336 (ssid->ssid_len != bss->ssid_len ||
337 os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) != 0))
338 continue;
339
340 if (pbc)
341 ret = eap_is_wps_pbc_enrollee(&ssid->eap);
342 else
343 ret = eap_is_wps_pin_enrollee(&ssid->eap);
344 wpabuf_free(wps_ie);
345 return ret;
346 }
347 wpabuf_free(wps_ie);
348 #endif /* CONFIG_WPS */
349
350 return 0;
351 }
352
353
wpa_bss_known(struct wpa_supplicant * wpa_s,struct wpa_bss * bss)354 static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
355 {
356 struct wpa_ssid *ssid;
357
358 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
359 if (ssid->ssid == NULL || ssid->ssid_len == 0)
360 continue;
361 if (ssid->ssid_len == bss->ssid_len &&
362 os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
363 return 1;
364 }
365
366 return 0;
367 }
368
369
wpa_bss_in_use(struct wpa_supplicant * wpa_s,struct wpa_bss * bss)370 static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
371 {
372 if (bss == wpa_s->current_bss)
373 return 1;
374
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 */
380
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);
384 }
385
386
wpa_bss_remove_oldest_unknown(struct wpa_supplicant * wpa_s)387 static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
388 {
389 struct wpa_bss *bss;
390
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__);
395 return 0;
396 }
397 }
398
399 return -1;
400 }
401
402
wpa_bss_remove_oldest(struct wpa_supplicant * wpa_s)403 static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
404 {
405 struct wpa_bss *bss;
406
407 /*
408 * Remove the oldest entry that does not match with any configured
409 * network.
410 */
411 if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
412 return 0;
413
414 /*
415 * Remove the oldest entry that isn't currently in use.
416 */
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__);
420 return 0;
421 }
422 }
423
424 return -1;
425 }
426
427
wpa_bss_add(struct wpa_supplicant * wpa_s,const u8 * ssid,size_t ssid_len,struct wpa_scan_res * res,struct os_reltime * fetch_time)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)
432 {
433 struct wpa_bss *bss;
434 char extra[50];
435
436 bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
437 if (bss == NULL)
438 return NULL;
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);
448
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;
455 }
456
457 dl_list_add_tail(&wpa_s->bss, &bss->list);
458 dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
459 wpa_s->num_bss++;
460 if (!is_zero_ether_addr(bss->hessid))
461 os_snprintf(extra, sizeof(extra), " HESSID " MACSTR,
462 MAC2STR(bss->hessid));
463 else
464 extra[0] = '\0';
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),
468 bss->freq, extra);
469 wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
470 return bss;
471 }
472
473
are_ies_equal(const struct wpa_bss * old,const struct wpa_scan_res * new_res,u32 ie)474 static int are_ies_equal(const struct wpa_bss *old,
475 const struct wpa_scan_res *new_res, u32 ie)
476 {
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;
481
482 switch (ie) {
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);
486 is_multi = 0;
487 break;
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);
491 is_multi = 1;
492 break;
493 case WLAN_EID_RSN:
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);
498 is_multi = 0;
499 break;
500 default:
501 wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
502 return 0;
503 }
504
505 if (is_multi) {
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;
511 } else {
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;
515 }
516
517 if (!old_ie || !new_ie)
518 ret = !old_ie && !new_ie;
519 else
520 ret = (old_ie_len == new_ie_len &&
521 os_memcmp(old_ie, new_ie, old_ie_len) == 0);
522
523 wpabuf_free(old_ie_buff);
524 wpabuf_free(new_ie_buff);
525
526 return ret;
527 }
528
529
wpa_bss_compare_res(const struct wpa_bss * old,const struct wpa_scan_res * new_res)530 static u32 wpa_bss_compare_res(const struct wpa_bss *old,
531 const struct wpa_scan_res *new_res)
532 {
533 u32 changes = 0;
534 int caps_diff = old->caps ^ new_res->caps;
535
536 if (old->freq != new_res->freq)
537 changes |= WPA_BSS_FREQ_CHANGED_FLAG;
538
539 if (old->level != new_res->level)
540 changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
541
542 if (caps_diff & IEEE80211_CAP_PRIVACY)
543 changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
544
545 if (caps_diff & IEEE80211_CAP_IBSS)
546 changes |= WPA_BSS_MODE_CHANGED_FLAG;
547
548 if (old->ie_len == new_res->ie_len &&
549 os_memcmp(old + 1, new_res + 1, old->ie_len) == 0)
550 return changes;
551 changes |= WPA_BSS_IES_CHANGED_FLAG;
552
553 if (!are_ies_equal(old, new_res, WPA_IE_VENDOR_TYPE))
554 changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
555
556 if (!are_ies_equal(old, new_res, WLAN_EID_RSN))
557 changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
558
559 if (!are_ies_equal(old, new_res, WPS_IE_VENDOR_TYPE))
560 changes |= WPA_BSS_WPS_CHANGED_FLAG;
561
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;
565
566 return changes;
567 }
568
569
notify_bss_changes(struct wpa_supplicant * wpa_s,u32 changes,const struct wpa_bss * bss)570 static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
571 const struct wpa_bss *bss)
572 {
573 if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
574 wpas_notify_bss_freq_changed(wpa_s, bss->id);
575
576 if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
577 wpas_notify_bss_signal_changed(wpa_s, bss->id);
578
579 if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
580 wpas_notify_bss_privacy_changed(wpa_s, bss->id);
581
582 if (changes & WPA_BSS_MODE_CHANGED_FLAG)
583 wpas_notify_bss_mode_changed(wpa_s, bss->id);
584
585 if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
586 wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
587
588 if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
589 wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
590
591 if (changes & WPA_BSS_WPS_CHANGED_FLAG)
592 wpas_notify_bss_wps_changed(wpa_s, bss->id);
593
594 if (changes & WPA_BSS_IES_CHANGED_FLAG)
595 wpas_notify_bss_ies_changed(wpa_s, bss->id);
596
597 if (changes & WPA_BSS_RATES_CHANGED_FLAG)
598 wpas_notify_bss_rates_changed(wpa_s, bss->id);
599
600 wpas_notify_bss_seen(wpa_s, bss->id);
601 }
602
603
604 static struct wpa_bss *
wpa_bss_update(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,struct wpa_scan_res * res,struct os_reltime * fetch_time)605 wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
606 struct wpa_scan_res *res, struct os_reltime *fetch_time)
607 {
608 u32 changes;
609
610 if (bss->last_update_idx == wpa_s->bss_update_idx) {
611 struct os_reltime update_time;
612
613 /*
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.
619 */
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,
628 bss->freq,
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,
633 res->freq,
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");
640 return bss;
641 }
642 wpa_printf(MSG_DEBUG,
643 "Accept this BSS entry since it looks more current than the previous update");
644 }
645
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);
655 #ifdef CONFIG_P2P
656 if (wpa_bss_get_vendor_ie(bss, P2P_IE_VENDOR_TYPE) &&
657 !wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE)) {
658 /*
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.
665 */
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));
669 } else
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;
676 } else {
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 +
681 res->beacon_ie_len);
682 if (nbss) {
683 unsigned int i;
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;
687 break;
688 }
689 }
690 if (wpa_s->current_bss == bss)
691 wpa_s->current_bss = nbss;
692 wpa_bss_update_pending_connect(wpa_s, bss, nbss);
693 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;
698 }
699 dl_list_add(prev, &bss->list_id);
700 }
701 if (changes & WPA_BSS_IES_CHANGED_FLAG)
702 wpa_bss_set_hessid(bss);
703 dl_list_add_tail(&wpa_s->bss, &bss->list);
704
705 notify_bss_changes(wpa_s, changes, bss);
706
707 return bss;
708 }
709
710
711 /**
712 * wpa_bss_update_start - Start a BSS table update from scan results
713 * @wpa_s: Pointer to wpa_supplicant data
714 *
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().
719 */
wpa_bss_update_start(struct wpa_supplicant * wpa_s)720 void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
721 {
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;
726 }
727
728
729 /**
730 * wpa_bss_update_scan_res - Update a BSS table entry based on a scan result
731 * @wpa_s: Pointer to wpa_supplicant data
732 * @res: Scan result
733 * @fetch_time: Time when the result was fetched from the driver
734 *
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().
738 */
wpa_bss_update_scan_res(struct wpa_supplicant * wpa_s,struct wpa_scan_res * res,struct os_reltime * fetch_time)739 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
740 struct wpa_scan_res *res,
741 struct os_reltime *fetch_time)
742 {
743 const u8 *ssid, *p2p, *mesh;
744 struct wpa_bss *bss;
745
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,
752 &age);
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);
758 return;
759 }
760 }
761
762 ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
763 if (ssid == NULL) {
764 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
765 MACSTR, MAC2STR(res->bssid));
766 return;
767 }
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));
771 return;
772 }
773
774 p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
775 #ifdef CONFIG_P2P
776 if (p2p == NULL &&
777 wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
778 /*
779 * If it's a P2P specific interface, then don't update
780 * the scan result without a P2P IE.
781 */
782 wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
783 " update for P2P interface", MAC2STR(res->bssid));
784 return;
785 }
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 */
790
791 /* TODO: add option for ignoring BSSes we are not interested in
792 * (to save memory) */
793
794 mesh = wpa_scan_get_ie(res, WLAN_EID_MESH_ID);
795 if (mesh && mesh[1] <= SSID_MAX_LEN)
796 ssid = mesh;
797
798 bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
799 if (bss == NULL)
800 bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res, fetch_time);
801 else {
802 bss = wpa_bss_update(wpa_s, bss, res, fetch_time);
803 if (wpa_s->last_scan_res) {
804 unsigned int i;
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 */
808 return;
809 }
810 }
811 }
812 }
813
814 if (bss == NULL)
815 return;
816 if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
817 struct wpa_bss **n;
818 unsigned int siz;
819 if (wpa_s->last_scan_res_size == 0)
820 siz = 32;
821 else
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 *));
825 if (n == NULL)
826 return;
827 wpa_s->last_scan_res = n;
828 wpa_s->last_scan_res_size = siz;
829 }
830
831 if (wpa_s->last_scan_res)
832 wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
833 }
834
835
wpa_bss_included_in_scan(const struct wpa_bss * bss,const struct scan_info * info)836 static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
837 const struct scan_info *info)
838 {
839 int found;
840 size_t i;
841
842 if (info == NULL)
843 return 1;
844
845 if (info->num_freqs) {
846 found = 0;
847 for (i = 0; i < info->num_freqs; i++) {
848 if (bss->freq == info->freqs[i]) {
849 found = 1;
850 break;
851 }
852 }
853 if (!found)
854 return 0;
855 }
856
857 if (info->num_ssids) {
858 found = 0;
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) ==
864 0)) {
865 found = 1;
866 break;
867 }
868 }
869 if (!found)
870 return 0;
871 }
872
873 return 1;
874 }
875
876
877 /**
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
882 *
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().
886 */
wpa_bss_update_end(struct wpa_supplicant * wpa_s,struct scan_info * info,int new_scan)887 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
888 int new_scan)
889 {
890 struct wpa_bss *bss, *n;
891
892 os_get_reltime(&wpa_s->last_scan);
893 if ((info && info->aborted) || !new_scan)
894 return; /* do not expire entries without new scan */
895
896 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
897 if (wpa_bss_in_use(wpa_s, bss))
898 continue;
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");
906 }
907 }
908
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);
911 }
912
913
914 /**
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
918 *
919 * Remove BSS entries that have not been updated during the last @age seconds.
920 */
wpa_bss_flush_by_age(struct wpa_supplicant * wpa_s,int age)921 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
922 {
923 struct wpa_bss *bss, *n;
924 struct os_reltime t;
925
926 if (dl_list_empty(&wpa_s->bss))
927 return;
928
929 os_get_reltime(&t);
930 t.sec -= age;
931
932 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
933 if (wpa_bss_in_use(wpa_s, bss))
934 continue;
935
936 if (os_reltime_before(&bss->last_update, &t)) {
937 wpa_bss_remove(wpa_s, bss, __func__);
938 } else
939 break;
940 }
941 }
942
943
944 /**
945 * wpa_bss_init - Initialize BSS table
946 * @wpa_s: Pointer to wpa_supplicant data
947 * Returns: 0 on success, -1 on failure
948 *
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.
951 */
wpa_bss_init(struct wpa_supplicant * wpa_s)952 int wpa_bss_init(struct wpa_supplicant *wpa_s)
953 {
954 dl_list_init(&wpa_s->bss);
955 dl_list_init(&wpa_s->bss_id);
956 return 0;
957 }
958
959
960 /**
961 * wpa_bss_flush - Flush all unused BSS entries
962 * @wpa_s: Pointer to wpa_supplicant data
963 */
wpa_bss_flush(struct wpa_supplicant * wpa_s)964 void wpa_bss_flush(struct wpa_supplicant *wpa_s)
965 {
966 struct wpa_bss *bss, *n;
967
968 wpa_s->clear_driver_scan_cache = 1;
969
970 if (wpa_s->bss.next == NULL)
971 return; /* BSS table not yet initialized */
972
973 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
974 if (wpa_bss_in_use(wpa_s, bss))
975 continue;
976 wpa_bss_remove(wpa_s, bss, __func__);
977 }
978 }
979
980
981 /**
982 * wpa_bss_deinit - Deinitialize BSS table
983 * @wpa_s: Pointer to wpa_supplicant data
984 */
wpa_bss_deinit(struct wpa_supplicant * wpa_s)985 void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
986 {
987 wpa_bss_flush(wpa_s);
988 }
989
990
991 /**
992 * wpa_bss_get_bssid - Fetch a BSS table entry based on BSSID
993 * @wpa_s: Pointer to wpa_supplicant data
994 * @bssid: BSSID
995 * Returns: Pointer to the BSS entry or %NULL if not found
996 */
wpa_bss_get_bssid(struct wpa_supplicant * wpa_s,const u8 * bssid)997 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
998 const u8 *bssid)
999 {
1000 struct wpa_bss *bss;
1001 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
1002 return NULL;
1003 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
1004 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
1005 return bss;
1006 }
1007 return NULL;
1008 }
1009
1010
1011 /**
1012 * wpa_bss_get_bssid_latest - Fetch the latest BSS table entry based on BSSID
1013 * @wpa_s: Pointer to wpa_supplicant data
1014 * @bssid: BSSID
1015 * Returns: Pointer to the BSS entry or %NULL if not found
1016 *
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).
1021 */
wpa_bss_get_bssid_latest(struct wpa_supplicant * wpa_s,const u8 * bssid)1022 struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
1023 const u8 *bssid)
1024 {
1025 struct wpa_bss *bss, *found = NULL;
1026 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
1027 return NULL;
1028 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
1029 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) != 0)
1030 continue;
1031 if (found == NULL ||
1032 os_reltime_before(&found->last_update, &bss->last_update))
1033 found = bss;
1034 }
1035 return found;
1036 }
1037
1038
1039 #ifdef CONFIG_P2P
1040 /**
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
1045 */
wpa_bss_get_p2p_dev_addr(struct wpa_supplicant * wpa_s,const u8 * dev_addr)1046 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
1047 const u8 *dev_addr)
1048 {
1049 struct wpa_bss *bss;
1050 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
1051 u8 addr[ETH_ALEN];
1052 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
1053 addr) == 0 &&
1054 os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
1055 return bss;
1056 }
1057 return NULL;
1058 }
1059 #endif /* CONFIG_P2P */
1060
1061
1062 /**
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
1067 */
wpa_bss_get_id(struct wpa_supplicant * wpa_s,unsigned int id)1068 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
1069 {
1070 struct wpa_bss *bss;
1071 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
1072 if (bss->id == id)
1073 return bss;
1074 }
1075 return NULL;
1076 }
1077
1078
1079 /**
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
1085 *
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.
1089 */
wpa_bss_get_id_range(struct wpa_supplicant * wpa_s,unsigned int idf,unsigned int idl)1090 struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
1091 unsigned int idf, unsigned int idl)
1092 {
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)
1096 return bss;
1097 }
1098 return NULL;
1099 }
1100
1101
1102 /**
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
1107 *
1108 * This function returns the first matching information element in the BSS
1109 * entry.
1110 */
wpa_bss_get_ie(const struct wpa_bss * bss,u8 ie)1111 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
1112 {
1113 return get_ie((const u8 *) (bss + 1), bss->ie_len, ie);
1114 }
1115
1116
1117 /**
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
1122 *
1123 * This function returns the first matching information element in the BSS
1124 * entry.
1125 */
wpa_bss_get_vendor_ie(const struct wpa_bss * bss,u32 vendor_type)1126 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
1127 {
1128 const u8 *end, *pos;
1129
1130 pos = (const u8 *) (bss + 1);
1131 end = pos + bss->ie_len;
1132
1133 while (end - pos > 1) {
1134 if (2 + pos[1] > end - pos)
1135 break;
1136 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1137 vendor_type == WPA_GET_BE32(&pos[2]))
1138 return pos;
1139 pos += 2 + pos[1];
1140 }
1141
1142 return NULL;
1143 }
1144
1145
1146 /**
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
1151 *
1152 * This function returns the first matching information element in the BSS
1153 * entry.
1154 *
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.
1157 */
wpa_bss_get_vendor_ie_beacon(const struct wpa_bss * bss,u32 vendor_type)1158 const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
1159 u32 vendor_type)
1160 {
1161 const u8 *end, *pos;
1162
1163 if (bss->beacon_ie_len == 0)
1164 return NULL;
1165
1166 pos = (const u8 *) (bss + 1);
1167 pos += bss->ie_len;
1168 end = pos + bss->beacon_ie_len;
1169
1170 while (end - pos > 1) {
1171 if (2 + pos[1] > end - pos)
1172 break;
1173 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
1174 vendor_type == WPA_GET_BE32(&pos[2]))
1175 return pos;
1176 pos += 2 + pos[1];
1177 }
1178
1179 return NULL;
1180 }
1181
1182
1183 /**
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
1188 *
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.
1192 */
wpa_bss_get_vendor_ie_multi(const struct wpa_bss * bss,u32 vendor_type)1193 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
1194 u32 vendor_type)
1195 {
1196 struct wpabuf *buf;
1197 const u8 *end, *pos;
1198
1199 buf = wpabuf_alloc(bss->ie_len);
1200 if (buf == NULL)
1201 return NULL;
1202
1203 pos = (const u8 *) (bss + 1);
1204 end = pos + bss->ie_len;
1205
1206 while (end - pos > 1) {
1207 if (2 + pos[1] > end - pos)
1208 break;
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);
1212 pos += 2 + pos[1];
1213 }
1214
1215 if (wpabuf_len(buf) == 0) {
1216 wpabuf_free(buf);
1217 buf = NULL;
1218 }
1219
1220 return buf;
1221 }
1222
1223
1224 /**
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
1229 *
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.
1233 *
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.
1236 */
wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss * bss,u32 vendor_type)1237 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
1238 u32 vendor_type)
1239 {
1240 struct wpabuf *buf;
1241 const u8 *end, *pos;
1242
1243 buf = wpabuf_alloc(bss->beacon_ie_len);
1244 if (buf == NULL)
1245 return NULL;
1246
1247 pos = (const u8 *) (bss + 1);
1248 pos += bss->ie_len;
1249 end = pos + bss->beacon_ie_len;
1250
1251 while (end - pos > 1) {
1252 if (2 + pos[1] > end - pos)
1253 break;
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);
1257 pos += 2 + pos[1];
1258 }
1259
1260 if (wpabuf_len(buf) == 0) {
1261 wpabuf_free(buf);
1262 buf = NULL;
1263 }
1264
1265 return buf;
1266 }
1267
1268
1269 /**
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
1273 */
wpa_bss_get_max_rate(const struct wpa_bss * bss)1274 int wpa_bss_get_max_rate(const struct wpa_bss *bss)
1275 {
1276 int rate = 0;
1277 const u8 *ie;
1278 int i;
1279
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;
1284 }
1285
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;
1290 }
1291
1292 return rate;
1293 }
1294
1295
1296 /**
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
1301 *
1302 * The caller is responsible for freeing the returned buffer with os_free() in
1303 * case of success.
1304 */
wpa_bss_get_bit_rates(const struct wpa_bss * bss,u8 ** rates)1305 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
1306 {
1307 const u8 *ie, *ie2;
1308 int i, j;
1309 unsigned int len;
1310 u8 *r;
1311
1312 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
1313 ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
1314
1315 len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
1316
1317 r = os_malloc(len);
1318 if (!r)
1319 return -1;
1320
1321 for (i = 0; ie && i < ie[1]; i++)
1322 r[i] = ie[i + 2] & 0x7f;
1323
1324 for (j = 0; ie2 && j < ie2[1]; j++)
1325 r[i + j] = ie2[j + 2] & 0x7f;
1326
1327 *rates = r;
1328 return len;
1329 }
1330
1331
1332 #ifdef CONFIG_FILS
wpa_bss_get_fils_cache_id(struct wpa_bss * bss)1333 const u8 * wpa_bss_get_fils_cache_id(struct wpa_bss *bss)
1334 {
1335 const u8 *ie;
1336
1337 if (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))
1340 return ie + 4;
1341 }
1342
1343 return NULL;
1344 }
1345 #endif /* CONFIG_FILS */
1346
1347
wpa_bss_ext_capab(const struct wpa_bss * bss,unsigned int capab)1348 int wpa_bss_ext_capab(const struct wpa_bss *bss, unsigned int capab)
1349 {
1350 return ieee802_11_ext_capab(wpa_bss_get_ie(bss, WLAN_EID_EXT_CAPAB),
1351 capab);
1352 }
1353