1 /*
2 * BSS table
3 * Copyright (c) 2009-2010, 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 "wpa_supplicant_i.h"
16 #include "config.h"
17 #include "notify.h"
18 #include "scan.h"
19 #include "bss.h"
20
21
22 /**
23 * WPA_BSS_EXPIRATION_PERIOD - Period of expiration run in seconds
24 */
25 #define WPA_BSS_EXPIRATION_PERIOD 10
26
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)
36
37
wpa_bss_set_hessid(struct wpa_bss * bss)38 static void wpa_bss_set_hessid(struct wpa_bss *bss)
39 {
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);
44 return;
45 }
46 if (ie[1] == 7)
47 os_memcpy(bss->hessid, ie + 3, ETH_ALEN);
48 else
49 os_memcpy(bss->hessid, ie + 5, ETH_ALEN);
50 #endif /* CONFIG_INTERWORKING */
51 }
52
53
wpa_bss_anqp_alloc(void)54 struct wpa_bss_anqp * wpa_bss_anqp_alloc(void)
55 {
56 struct wpa_bss_anqp *anqp;
57 anqp = os_zalloc(sizeof(*anqp));
58 if (anqp == NULL)
59 return NULL;
60 anqp->users = 1;
61 return anqp;
62 }
63
64
wpa_bss_anqp_free(struct wpa_bss_anqp * anqp)65 static void wpa_bss_anqp_free(struct wpa_bss_anqp *anqp)
66 {
67 if (anqp == NULL)
68 return;
69
70 anqp->users--;
71 if (anqp->users > 0) {
72 /* Another BSS entry holds a pointer to this ANQP info */
73 return;
74 }
75
76 #ifdef CONFIG_INTERWORKING
77 wpabuf_free(anqp->venue_name);
78 wpabuf_free(anqp->network_auth_type);
79 wpabuf_free(anqp->roaming_consortium);
80 wpabuf_free(anqp->ip_addr_type_availability);
81 wpabuf_free(anqp->nai_realm);
82 wpabuf_free(anqp->anqp_3gpp);
83 wpabuf_free(anqp->domain_name);
84 #endif /* CONFIG_INTERWORKING */
85 #ifdef CONFIG_HS20
86 wpabuf_free(anqp->hs20_operator_friendly_name);
87 wpabuf_free(anqp->hs20_wan_metrics);
88 wpabuf_free(anqp->hs20_connection_capability);
89 wpabuf_free(anqp->hs20_operating_class);
90 #endif /* CONFIG_HS20 */
91
92 os_free(anqp);
93 }
94
95
wpa_bss_remove(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,const char * reason)96 static void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
97 const char *reason)
98 {
99 if (wpa_s->last_scan_res) {
100 unsigned int i;
101 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
102 if (wpa_s->last_scan_res[i] == bss) {
103 os_memmove(&wpa_s->last_scan_res[i],
104 &wpa_s->last_scan_res[i + 1],
105 (wpa_s->last_scan_res_used - i - 1)
106 * sizeof(struct wpa_bss *));
107 wpa_s->last_scan_res_used--;
108 break;
109 }
110 }
111 }
112 dl_list_del(&bss->list);
113 dl_list_del(&bss->list_id);
114 wpa_s->num_bss--;
115 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Remove id %u BSSID " MACSTR
116 " SSID '%s' due to %s", bss->id, MAC2STR(bss->bssid),
117 wpa_ssid_txt(bss->ssid, bss->ssid_len), reason);
118 wpas_notify_bss_removed(wpa_s, bss->bssid, bss->id);
119 wpa_bss_anqp_free(bss->anqp);
120 os_free(bss);
121 }
122
123
wpa_bss_get(struct wpa_supplicant * wpa_s,const u8 * bssid,const u8 * ssid,size_t ssid_len)124 struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
125 const u8 *ssid, size_t ssid_len)
126 {
127 struct wpa_bss *bss;
128 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
129 return NULL;
130 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
131 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0 &&
132 bss->ssid_len == ssid_len &&
133 os_memcmp(bss->ssid, ssid, ssid_len) == 0)
134 return bss;
135 }
136 return NULL;
137 }
138
139
wpa_bss_copy_res(struct wpa_bss * dst,struct wpa_scan_res * src)140 static void wpa_bss_copy_res(struct wpa_bss *dst, struct wpa_scan_res *src)
141 {
142 os_time_t usec;
143
144 dst->flags = src->flags;
145 os_memcpy(dst->bssid, src->bssid, ETH_ALEN);
146 dst->freq = src->freq;
147 dst->beacon_int = src->beacon_int;
148 dst->caps = src->caps;
149 dst->qual = src->qual;
150 dst->noise = src->noise;
151 dst->level = src->level;
152 dst->tsf = src->tsf;
153
154 os_get_time(&dst->last_update);
155 dst->last_update.sec -= src->age / 1000;
156 usec = (src->age % 1000) * 1000;
157 if (dst->last_update.usec < usec) {
158 dst->last_update.sec--;
159 dst->last_update.usec += 1000000;
160 }
161 dst->last_update.usec -= usec;
162 }
163
164
wpa_bss_known(struct wpa_supplicant * wpa_s,struct wpa_bss * bss)165 static int wpa_bss_known(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
166 {
167 struct wpa_ssid *ssid;
168
169 for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
170 if (ssid->ssid == NULL || ssid->ssid_len == 0)
171 continue;
172 if (ssid->ssid_len == bss->ssid_len &&
173 os_memcmp(ssid->ssid, bss->ssid, ssid->ssid_len) == 0)
174 return 1;
175 }
176
177 return 0;
178 }
179
180
wpa_bss_in_use(struct wpa_supplicant * wpa_s,struct wpa_bss * bss)181 static int wpa_bss_in_use(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
182 {
183 return bss == wpa_s->current_bss ||
184 os_memcmp(bss->bssid, wpa_s->bssid, ETH_ALEN) == 0 ||
185 os_memcmp(bss->bssid, wpa_s->pending_bssid, ETH_ALEN) == 0;
186 }
187
188
wpa_bss_remove_oldest_unknown(struct wpa_supplicant * wpa_s)189 static int wpa_bss_remove_oldest_unknown(struct wpa_supplicant *wpa_s)
190 {
191 struct wpa_bss *bss;
192
193 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
194 if (!wpa_bss_known(wpa_s, bss)) {
195 wpa_bss_remove(wpa_s, bss, __func__);
196 return 0;
197 }
198 }
199
200 return -1;
201 }
202
203
wpa_bss_remove_oldest(struct wpa_supplicant * wpa_s)204 static int wpa_bss_remove_oldest(struct wpa_supplicant *wpa_s)
205 {
206 struct wpa_bss *bss;
207
208 /*
209 * Remove the oldest entry that does not match with any configured
210 * network.
211 */
212 if (wpa_bss_remove_oldest_unknown(wpa_s) == 0)
213 return 0;
214
215 /*
216 * Remove the oldest entry that isn't currently in use.
217 */
218 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
219 if (!wpa_bss_in_use(wpa_s, bss)) {
220 wpa_bss_remove(wpa_s, bss, __func__);
221 return 0;
222 }
223 }
224
225 return -1;
226 }
227
228
wpa_bss_add(struct wpa_supplicant * wpa_s,const u8 * ssid,size_t ssid_len,struct wpa_scan_res * res)229 static struct wpa_bss * wpa_bss_add(struct wpa_supplicant *wpa_s,
230 const u8 *ssid, size_t ssid_len,
231 struct wpa_scan_res *res)
232 {
233 struct wpa_bss *bss;
234
235 bss = os_zalloc(sizeof(*bss) + res->ie_len + res->beacon_ie_len);
236 if (bss == NULL)
237 return NULL;
238 bss->id = wpa_s->bss_next_id++;
239 bss->last_update_idx = wpa_s->bss_update_idx;
240 wpa_bss_copy_res(bss, res);
241 os_memcpy(bss->ssid, ssid, ssid_len);
242 bss->ssid_len = ssid_len;
243 bss->ie_len = res->ie_len;
244 bss->beacon_ie_len = res->beacon_ie_len;
245 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
246 wpa_bss_set_hessid(bss);
247
248 dl_list_add_tail(&wpa_s->bss, &bss->list);
249 dl_list_add_tail(&wpa_s->bss_id, &bss->list_id);
250 wpa_s->num_bss++;
251 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Add new id %u BSSID " MACSTR
252 " SSID '%s'",
253 bss->id, MAC2STR(bss->bssid), wpa_ssid_txt(ssid, ssid_len));
254 wpas_notify_bss_added(wpa_s, bss->bssid, bss->id);
255 if (wpa_s->num_bss > wpa_s->conf->bss_max_count &&
256 wpa_bss_remove_oldest(wpa_s) != 0) {
257 wpa_printf(MSG_ERROR, "Increasing the MAX BSS count to %d "
258 "because all BSSes are in use. We should normally "
259 "not get here!", (int) wpa_s->num_bss);
260 wpa_s->conf->bss_max_count = wpa_s->num_bss;
261 }
262 return bss;
263 }
264
265
are_ies_equal(const struct wpa_bss * old,const struct wpa_scan_res * new,u32 ie)266 static int are_ies_equal(const struct wpa_bss *old,
267 const struct wpa_scan_res *new, u32 ie)
268 {
269 const u8 *old_ie, *new_ie;
270 struct wpabuf *old_ie_buff = NULL;
271 struct wpabuf *new_ie_buff = NULL;
272 int new_ie_len, old_ie_len, ret, is_multi;
273
274 switch (ie) {
275 case WPA_IE_VENDOR_TYPE:
276 old_ie = wpa_bss_get_vendor_ie(old, ie);
277 new_ie = wpa_scan_get_vendor_ie(new, ie);
278 is_multi = 0;
279 break;
280 case WPS_IE_VENDOR_TYPE:
281 old_ie_buff = wpa_bss_get_vendor_ie_multi(old, ie);
282 new_ie_buff = wpa_scan_get_vendor_ie_multi(new, ie);
283 is_multi = 1;
284 break;
285 case WLAN_EID_RSN:
286 case WLAN_EID_SUPP_RATES:
287 case WLAN_EID_EXT_SUPP_RATES:
288 old_ie = wpa_bss_get_ie(old, ie);
289 new_ie = wpa_scan_get_ie(new, ie);
290 is_multi = 0;
291 break;
292 default:
293 wpa_printf(MSG_DEBUG, "bss: %s: cannot compare IEs", __func__);
294 return 0;
295 }
296
297 if (is_multi) {
298 /* in case of multiple IEs stored in buffer */
299 old_ie = old_ie_buff ? wpabuf_head_u8(old_ie_buff) : NULL;
300 new_ie = new_ie_buff ? wpabuf_head_u8(new_ie_buff) : NULL;
301 old_ie_len = old_ie_buff ? wpabuf_len(old_ie_buff) : 0;
302 new_ie_len = new_ie_buff ? wpabuf_len(new_ie_buff) : 0;
303 } else {
304 /* in case of single IE */
305 old_ie_len = old_ie ? old_ie[1] + 2 : 0;
306 new_ie_len = new_ie ? new_ie[1] + 2 : 0;
307 }
308
309 if (!old_ie || !new_ie)
310 ret = !old_ie && !new_ie;
311 else
312 ret = (old_ie_len == new_ie_len &&
313 os_memcmp(old_ie, new_ie, old_ie_len) == 0);
314
315 wpabuf_free(old_ie_buff);
316 wpabuf_free(new_ie_buff);
317
318 return ret;
319 }
320
321
wpa_bss_compare_res(const struct wpa_bss * old,const struct wpa_scan_res * new)322 static u32 wpa_bss_compare_res(const struct wpa_bss *old,
323 const struct wpa_scan_res *new)
324 {
325 u32 changes = 0;
326 int caps_diff = old->caps ^ new->caps;
327
328 if (old->freq != new->freq)
329 changes |= WPA_BSS_FREQ_CHANGED_FLAG;
330
331 if (old->level != new->level)
332 changes |= WPA_BSS_SIGNAL_CHANGED_FLAG;
333
334 if (caps_diff & IEEE80211_CAP_PRIVACY)
335 changes |= WPA_BSS_PRIVACY_CHANGED_FLAG;
336
337 if (caps_diff & IEEE80211_CAP_IBSS)
338 changes |= WPA_BSS_MODE_CHANGED_FLAG;
339
340 if (old->ie_len == new->ie_len &&
341 os_memcmp(old + 1, new + 1, old->ie_len) == 0)
342 return changes;
343 changes |= WPA_BSS_IES_CHANGED_FLAG;
344
345 if (!are_ies_equal(old, new, WPA_IE_VENDOR_TYPE))
346 changes |= WPA_BSS_WPAIE_CHANGED_FLAG;
347
348 if (!are_ies_equal(old, new, WLAN_EID_RSN))
349 changes |= WPA_BSS_RSNIE_CHANGED_FLAG;
350
351 if (!are_ies_equal(old, new, WPS_IE_VENDOR_TYPE))
352 changes |= WPA_BSS_WPS_CHANGED_FLAG;
353
354 if (!are_ies_equal(old, new, WLAN_EID_SUPP_RATES) ||
355 !are_ies_equal(old, new, WLAN_EID_EXT_SUPP_RATES))
356 changes |= WPA_BSS_RATES_CHANGED_FLAG;
357
358 return changes;
359 }
360
361
notify_bss_changes(struct wpa_supplicant * wpa_s,u32 changes,const struct wpa_bss * bss)362 static void notify_bss_changes(struct wpa_supplicant *wpa_s, u32 changes,
363 const struct wpa_bss *bss)
364 {
365 if (changes & WPA_BSS_FREQ_CHANGED_FLAG)
366 wpas_notify_bss_freq_changed(wpa_s, bss->id);
367
368 if (changes & WPA_BSS_SIGNAL_CHANGED_FLAG)
369 wpas_notify_bss_signal_changed(wpa_s, bss->id);
370
371 if (changes & WPA_BSS_PRIVACY_CHANGED_FLAG)
372 wpas_notify_bss_privacy_changed(wpa_s, bss->id);
373
374 if (changes & WPA_BSS_MODE_CHANGED_FLAG)
375 wpas_notify_bss_mode_changed(wpa_s, bss->id);
376
377 if (changes & WPA_BSS_WPAIE_CHANGED_FLAG)
378 wpas_notify_bss_wpaie_changed(wpa_s, bss->id);
379
380 if (changes & WPA_BSS_RSNIE_CHANGED_FLAG)
381 wpas_notify_bss_rsnie_changed(wpa_s, bss->id);
382
383 if (changes & WPA_BSS_WPS_CHANGED_FLAG)
384 wpas_notify_bss_wps_changed(wpa_s, bss->id);
385
386 if (changes & WPA_BSS_IES_CHANGED_FLAG)
387 wpas_notify_bss_ies_changed(wpa_s, bss->id);
388
389 if (changes & WPA_BSS_RATES_CHANGED_FLAG)
390 wpas_notify_bss_rates_changed(wpa_s, bss->id);
391 }
392
393
394 static struct wpa_bss *
wpa_bss_update(struct wpa_supplicant * wpa_s,struct wpa_bss * bss,struct wpa_scan_res * res)395 wpa_bss_update(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
396 struct wpa_scan_res *res)
397 {
398 u32 changes;
399
400 changes = wpa_bss_compare_res(bss, res);
401 bss->scan_miss_count = 0;
402 bss->last_update_idx = wpa_s->bss_update_idx;
403 wpa_bss_copy_res(bss, res);
404 /* Move the entry to the end of the list */
405 dl_list_del(&bss->list);
406 if (bss->ie_len + bss->beacon_ie_len >=
407 res->ie_len + res->beacon_ie_len) {
408 os_memcpy(bss + 1, res + 1, res->ie_len + res->beacon_ie_len);
409 bss->ie_len = res->ie_len;
410 bss->beacon_ie_len = res->beacon_ie_len;
411 } else {
412 struct wpa_bss *nbss;
413 struct dl_list *prev = bss->list_id.prev;
414 dl_list_del(&bss->list_id);
415 nbss = os_realloc(bss, sizeof(*bss) + res->ie_len +
416 res->beacon_ie_len);
417 if (nbss) {
418 unsigned int i;
419 for (i = 0; i < wpa_s->last_scan_res_used; i++) {
420 if (wpa_s->last_scan_res[i] == bss) {
421 wpa_s->last_scan_res[i] = nbss;
422 break;
423 }
424 }
425 if (wpa_s->current_bss == bss)
426 wpa_s->current_bss = nbss;
427 bss = nbss;
428 os_memcpy(bss + 1, res + 1,
429 res->ie_len + res->beacon_ie_len);
430 bss->ie_len = res->ie_len;
431 bss->beacon_ie_len = res->beacon_ie_len;
432 }
433 dl_list_add(prev, &bss->list_id);
434 }
435 if (changes & WPA_BSS_IES_CHANGED_FLAG)
436 wpa_bss_set_hessid(bss);
437 dl_list_add_tail(&wpa_s->bss, &bss->list);
438
439 notify_bss_changes(wpa_s, changes, bss);
440
441 return bss;
442 }
443
444
wpa_bss_update_start(struct wpa_supplicant * wpa_s)445 void wpa_bss_update_start(struct wpa_supplicant *wpa_s)
446 {
447 wpa_s->bss_update_idx++;
448 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Start scan result update %u",
449 wpa_s->bss_update_idx);
450 wpa_s->last_scan_res_used = 0;
451 }
452
453
wpa_bss_update_scan_res(struct wpa_supplicant * wpa_s,struct wpa_scan_res * res)454 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
455 struct wpa_scan_res *res)
456 {
457 const u8 *ssid, *p2p;
458 struct wpa_bss *bss;
459
460 ssid = wpa_scan_get_ie(res, WLAN_EID_SSID);
461 if (ssid == NULL) {
462 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: No SSID IE included for "
463 MACSTR, MAC2STR(res->bssid));
464 return;
465 }
466 if (ssid[1] > 32) {
467 wpa_dbg(wpa_s, MSG_DEBUG, "BSS: Too long SSID IE included for "
468 MACSTR, MAC2STR(res->bssid));
469 return;
470 }
471
472 p2p = wpa_scan_get_vendor_ie(res, P2P_IE_VENDOR_TYPE);
473 #ifdef CONFIG_P2P
474 if (p2p == NULL &&
475 wpa_s->p2p_group_interface != NOT_P2P_GROUP_INTERFACE) {
476 /*
477 * If it's a P2P specific interface, then don't update
478 * the scan result without a P2P IE.
479 */
480 wpa_printf(MSG_DEBUG, "BSS: No P2P IE - skipping BSS " MACSTR
481 " update for P2P interface", MAC2STR(res->bssid));
482 return;
483 }
484 #endif /* CONFIG_P2P */
485 if (p2p && ssid[1] == P2P_WILDCARD_SSID_LEN &&
486 os_memcmp(ssid + 2, P2P_WILDCARD_SSID, P2P_WILDCARD_SSID_LEN) == 0)
487 return; /* Skip P2P listen discovery results here */
488
489 /* TODO: add option for ignoring BSSes we are not interested in
490 * (to save memory) */
491 bss = wpa_bss_get(wpa_s, res->bssid, ssid + 2, ssid[1]);
492 if (bss == NULL)
493 bss = wpa_bss_add(wpa_s, ssid + 2, ssid[1], res);
494 else
495 bss = wpa_bss_update(wpa_s, bss, res);
496
497 if (bss == NULL)
498 return;
499 if (wpa_s->last_scan_res_used >= wpa_s->last_scan_res_size) {
500 struct wpa_bss **n;
501 unsigned int siz;
502 if (wpa_s->last_scan_res_size == 0)
503 siz = 32;
504 else
505 siz = wpa_s->last_scan_res_size * 2;
506 n = os_realloc_array(wpa_s->last_scan_res, siz,
507 sizeof(struct wpa_bss *));
508 if (n == NULL)
509 return;
510 wpa_s->last_scan_res = n;
511 wpa_s->last_scan_res_size = siz;
512 }
513
514 wpa_s->last_scan_res[wpa_s->last_scan_res_used++] = bss;
515 }
516
517
wpa_bss_included_in_scan(const struct wpa_bss * bss,const struct scan_info * info)518 static int wpa_bss_included_in_scan(const struct wpa_bss *bss,
519 const struct scan_info *info)
520 {
521 int found;
522 size_t i;
523
524 if (info == NULL)
525 return 1;
526
527 if (info->num_freqs) {
528 found = 0;
529 for (i = 0; i < info->num_freqs; i++) {
530 if (bss->freq == info->freqs[i]) {
531 found = 1;
532 break;
533 }
534 }
535 if (!found)
536 return 0;
537 }
538
539 if (info->num_ssids) {
540 found = 0;
541 for (i = 0; i < info->num_ssids; i++) {
542 const struct wpa_driver_scan_ssid *s = &info->ssids[i];
543 if ((s->ssid == NULL || s->ssid_len == 0) ||
544 (s->ssid_len == bss->ssid_len &&
545 os_memcmp(s->ssid, bss->ssid, bss->ssid_len) ==
546 0)) {
547 found = 1;
548 break;
549 }
550 }
551 if (!found)
552 return 0;
553 }
554
555 return 1;
556 }
557
558
wpa_bss_update_end(struct wpa_supplicant * wpa_s,struct scan_info * info,int new_scan)559 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
560 int new_scan)
561 {
562 struct wpa_bss *bss, *n;
563
564 wpa_s->last_scan_full = 0;
565 os_get_time(&wpa_s->last_scan);
566 if (!new_scan)
567 return; /* do not expire entries without new scan */
568
569 if (info && !info->aborted && !info->freqs) {
570 size_t i;
571 if (info->num_ssids == 0) {
572 wpa_s->last_scan_full = 1;
573 } else {
574 for (i = 0; i < info->num_ssids; i++) {
575 if (info->ssids[i].ssid == NULL ||
576 info->ssids[i].ssid_len == 0) {
577 wpa_s->last_scan_full = 1;
578 break;
579 }
580 }
581 }
582 }
583
584 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
585 if (wpa_bss_in_use(wpa_s, bss))
586 continue;
587 if (!wpa_bss_included_in_scan(bss, info))
588 continue; /* expire only BSSes that were scanned */
589 if (bss->last_update_idx < wpa_s->bss_update_idx)
590 bss->scan_miss_count++;
591 if (bss->scan_miss_count >=
592 wpa_s->conf->bss_expiration_scan_count) {
593 wpa_bss_remove(wpa_s, bss, "no match in scan");
594 }
595 }
596
597 wpa_printf(MSG_DEBUG, "BSS: last_scan_res_used=%u/%u "
598 "last_scan_full=%d",
599 wpa_s->last_scan_res_used, wpa_s->last_scan_res_size,
600 wpa_s->last_scan_full);
601 }
602
603
wpa_bss_flush_by_age(struct wpa_supplicant * wpa_s,int age)604 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age)
605 {
606 struct wpa_bss *bss, *n;
607 struct os_time t;
608
609 if (dl_list_empty(&wpa_s->bss))
610 return;
611
612 os_get_time(&t);
613 t.sec -= age;
614
615 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
616 if (wpa_bss_in_use(wpa_s, bss))
617 continue;
618
619 if (os_time_before(&bss->last_update, &t)) {
620 wpa_bss_remove(wpa_s, bss, __func__);
621 } else
622 break;
623 }
624 }
625
626
wpa_bss_timeout(void * eloop_ctx,void * timeout_ctx)627 static void wpa_bss_timeout(void *eloop_ctx, void *timeout_ctx)
628 {
629 struct wpa_supplicant *wpa_s = eloop_ctx;
630
631 wpa_bss_flush_by_age(wpa_s, wpa_s->conf->bss_expiration_age);
632 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
633 wpa_bss_timeout, wpa_s, NULL);
634 }
635
636
wpa_bss_init(struct wpa_supplicant * wpa_s)637 int wpa_bss_init(struct wpa_supplicant *wpa_s)
638 {
639 dl_list_init(&wpa_s->bss);
640 dl_list_init(&wpa_s->bss_id);
641 eloop_register_timeout(WPA_BSS_EXPIRATION_PERIOD, 0,
642 wpa_bss_timeout, wpa_s, NULL);
643 return 0;
644 }
645
646
wpa_bss_flush(struct wpa_supplicant * wpa_s)647 void wpa_bss_flush(struct wpa_supplicant *wpa_s)
648 {
649 struct wpa_bss *bss, *n;
650
651 if (wpa_s->bss.next == NULL)
652 return; /* BSS table not yet initialized */
653
654 dl_list_for_each_safe(bss, n, &wpa_s->bss, struct wpa_bss, list) {
655 if (wpa_bss_in_use(wpa_s, bss))
656 continue;
657 wpa_bss_remove(wpa_s, bss, __func__);
658 }
659 }
660
661
wpa_bss_deinit(struct wpa_supplicant * wpa_s)662 void wpa_bss_deinit(struct wpa_supplicant *wpa_s)
663 {
664 eloop_cancel_timeout(wpa_bss_timeout, wpa_s, NULL);
665 wpa_bss_flush(wpa_s);
666 }
667
668
wpa_bss_get_bssid(struct wpa_supplicant * wpa_s,const u8 * bssid)669 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
670 const u8 *bssid)
671 {
672 struct wpa_bss *bss;
673 if (!wpa_supplicant_filter_bssid_match(wpa_s, bssid))
674 return NULL;
675 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
676 if (os_memcmp(bss->bssid, bssid, ETH_ALEN) == 0)
677 return bss;
678 }
679 return NULL;
680 }
681
682
683 #ifdef CONFIG_P2P
wpa_bss_get_p2p_dev_addr(struct wpa_supplicant * wpa_s,const u8 * dev_addr)684 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
685 const u8 *dev_addr)
686 {
687 struct wpa_bss *bss;
688 dl_list_for_each_reverse(bss, &wpa_s->bss, struct wpa_bss, list) {
689 u8 addr[ETH_ALEN];
690 if (p2p_parse_dev_addr((const u8 *) (bss + 1), bss->ie_len,
691 addr) == 0 &&
692 os_memcmp(addr, dev_addr, ETH_ALEN) == 0)
693 return bss;
694 }
695 return NULL;
696 }
697 #endif /* CONFIG_P2P */
698
699
wpa_bss_get_id(struct wpa_supplicant * wpa_s,unsigned int id)700 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id)
701 {
702 struct wpa_bss *bss;
703 dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
704 if (bss->id == id)
705 return bss;
706 }
707 return NULL;
708 }
709
710
wpa_bss_get_ie(const struct wpa_bss * bss,u8 ie)711 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie)
712 {
713 const u8 *end, *pos;
714
715 pos = (const u8 *) (bss + 1);
716 end = pos + bss->ie_len;
717
718 while (pos + 1 < end) {
719 if (pos + 2 + pos[1] > end)
720 break;
721 if (pos[0] == ie)
722 return pos;
723 pos += 2 + pos[1];
724 }
725
726 return NULL;
727 }
728
729
wpa_bss_get_vendor_ie(const struct wpa_bss * bss,u32 vendor_type)730 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type)
731 {
732 const u8 *end, *pos;
733
734 pos = (const u8 *) (bss + 1);
735 end = pos + bss->ie_len;
736
737 while (pos + 1 < end) {
738 if (pos + 2 + pos[1] > end)
739 break;
740 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
741 vendor_type == WPA_GET_BE32(&pos[2]))
742 return pos;
743 pos += 2 + pos[1];
744 }
745
746 return NULL;
747 }
748
749
wpa_bss_get_vendor_ie_multi(const struct wpa_bss * bss,u32 vendor_type)750 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
751 u32 vendor_type)
752 {
753 struct wpabuf *buf;
754 const u8 *end, *pos;
755
756 buf = wpabuf_alloc(bss->ie_len);
757 if (buf == NULL)
758 return NULL;
759
760 pos = (const u8 *) (bss + 1);
761 end = pos + bss->ie_len;
762
763 while (pos + 1 < end) {
764 if (pos + 2 + pos[1] > end)
765 break;
766 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
767 vendor_type == WPA_GET_BE32(&pos[2]))
768 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
769 pos += 2 + pos[1];
770 }
771
772 if (wpabuf_len(buf) == 0) {
773 wpabuf_free(buf);
774 buf = NULL;
775 }
776
777 return buf;
778 }
779
780
wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss * bss,u32 vendor_type)781 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
782 u32 vendor_type)
783 {
784 struct wpabuf *buf;
785 const u8 *end, *pos;
786
787 buf = wpabuf_alloc(bss->beacon_ie_len);
788 if (buf == NULL)
789 return NULL;
790
791 pos = (const u8 *) (bss + 1);
792 pos += bss->ie_len;
793 end = pos + bss->beacon_ie_len;
794
795 while (pos + 1 < end) {
796 if (pos + 2 + pos[1] > end)
797 break;
798 if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
799 vendor_type == WPA_GET_BE32(&pos[2]))
800 wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
801 pos += 2 + pos[1];
802 }
803
804 if (wpabuf_len(buf) == 0) {
805 wpabuf_free(buf);
806 buf = NULL;
807 }
808
809 return buf;
810 }
811
812
wpa_bss_get_max_rate(const struct wpa_bss * bss)813 int wpa_bss_get_max_rate(const struct wpa_bss *bss)
814 {
815 int rate = 0;
816 const u8 *ie;
817 int i;
818
819 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
820 for (i = 0; ie && i < ie[1]; i++) {
821 if ((ie[i + 2] & 0x7f) > rate)
822 rate = ie[i + 2] & 0x7f;
823 }
824
825 ie = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
826 for (i = 0; ie && i < ie[1]; i++) {
827 if ((ie[i + 2] & 0x7f) > rate)
828 rate = ie[i + 2] & 0x7f;
829 }
830
831 return rate;
832 }
833
834
wpa_bss_get_bit_rates(const struct wpa_bss * bss,u8 ** rates)835 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
836 {
837 const u8 *ie, *ie2;
838 int i, j;
839 unsigned int len;
840 u8 *r;
841
842 ie = wpa_bss_get_ie(bss, WLAN_EID_SUPP_RATES);
843 ie2 = wpa_bss_get_ie(bss, WLAN_EID_EXT_SUPP_RATES);
844
845 len = (ie ? ie[1] : 0) + (ie2 ? ie2[1] : 0);
846
847 r = os_malloc(len);
848 if (!r)
849 return -1;
850
851 for (i = 0; ie && i < ie[1]; i++)
852 r[i] = ie[i + 2] & 0x7f;
853
854 for (j = 0; ie2 && j < ie2[1]; j++)
855 r[i + j] = ie2[j + 2] & 0x7f;
856
857 *rates = r;
858 return len;
859 }
860