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Only expire scanned BSSes based on new scan results
[hostap-gosc2009.git] / wpa_supplicant / events.c
bloba80104abb1f28d38b39203df1306e51ee7cb63e2
1 /*
2 * WPA Supplicant - Driver event processing
3 * Copyright (c) 2003-2010, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "eapol_supp/eapol_supp_sm.h"
19 #include "rsn_supp/wpa.h"
20 #include "eloop.h"
21 #include "config.h"
22 #include "l2_packet/l2_packet.h"
23 #include "wpa_supplicant_i.h"
24 #include "driver_i.h"
25 #include "pcsc_funcs.h"
26 #include "rsn_supp/preauth.h"
27 #include "rsn_supp/pmksa_cache.h"
28 #include "common/wpa_ctrl.h"
29 #include "eap_peer/eap.h"
30 #include "notify.h"
31 #include "common/ieee802_11_defs.h"
32 #include "blacklist.h"
33 #include "wpas_glue.h"
34 #include "wps_supplicant.h"
35 #include "ibss_rsn.h"
36 #include "sme.h"
37 #include "bgscan.h"
38 #include "ap.h"
39
40
41 static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s)
42 {
43 struct wpa_ssid *ssid, *old_ssid;
44
45 if (wpa_s->conf->ap_scan == 1 && wpa_s->current_ssid)
46 return 0;
47
48 wpa_printf(MSG_DEBUG, "Select network based on association "
49 "information");
50 ssid = wpa_supplicant_get_ssid(wpa_s);
51 if (ssid == NULL) {
52 wpa_printf(MSG_INFO, "No network configuration found for the "
53 "current AP");
54 return -1;
55 }
56
57 if (ssid->disabled) {
58 wpa_printf(MSG_DEBUG, "Selected network is disabled");
59 return -1;
60 }
61
62 wpa_printf(MSG_DEBUG, "Network configuration found for the current "
63 "AP");
64 if (ssid->key_mgmt & (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
65 WPA_KEY_MGMT_WPA_NONE |
66 WPA_KEY_MGMT_FT_PSK | WPA_KEY_MGMT_FT_IEEE8021X |
67 WPA_KEY_MGMT_PSK_SHA256 |
68 WPA_KEY_MGMT_IEEE8021X_SHA256)) {
69 u8 wpa_ie[80];
70 size_t wpa_ie_len = sizeof(wpa_ie);
71 wpa_supplicant_set_suites(wpa_s, NULL, ssid,
72 wpa_ie, &wpa_ie_len);
73 } else {
74 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
75 }
76
77 if (wpa_s->current_ssid && wpa_s->current_ssid != ssid)
78 eapol_sm_invalidate_cached_session(wpa_s->eapol);
79 old_ssid = wpa_s->current_ssid;
80 wpa_s->current_ssid = ssid;
81 wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
82 wpa_supplicant_initiate_eapol(wpa_s);
83 if (old_ssid != wpa_s->current_ssid)
84 wpas_notify_network_changed(wpa_s);
85
86 return 0;
87 }
88
89
90 static void wpa_supplicant_stop_countermeasures(void *eloop_ctx,
91 void *sock_ctx)
92 {
93 struct wpa_supplicant *wpa_s = eloop_ctx;
94
95 if (wpa_s->countermeasures) {
96 wpa_s->countermeasures = 0;
97 wpa_drv_set_countermeasures(wpa_s, 0);
98 wpa_msg(wpa_s, MSG_INFO, "WPA: TKIP countermeasures stopped");
99 wpa_supplicant_req_scan(wpa_s, 0, 0);
100 }
101 }
102
103
104 void wpa_supplicant_mark_disassoc(struct wpa_supplicant *wpa_s)
105 {
106 int bssid_changed;
107
108 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
109 bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
110 os_memset(wpa_s->bssid, 0, ETH_ALEN);
111 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
112 if (bssid_changed)
113 wpas_notify_bssid_changed(wpa_s);
114
115 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
116 eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
117 if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt))
118 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
119 wpa_s->ap_ies_from_associnfo = 0;
120 }
121
122
123 static void wpa_find_assoc_pmkid(struct wpa_supplicant *wpa_s)
124 {
125 struct wpa_ie_data ie;
126 int pmksa_set = -1;
127 size_t i;
128
129 if (wpa_sm_parse_own_wpa_ie(wpa_s->wpa, &ie) < 0 ||
130 ie.pmkid == NULL)
131 return;
132
133 for (i = 0; i < ie.num_pmkid; i++) {
134 pmksa_set = pmksa_cache_set_current(wpa_s->wpa,
135 ie.pmkid + i * PMKID_LEN,
136 NULL, NULL, 0);
137 if (pmksa_set == 0) {
138 eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
139 break;
140 }
141 }
142
143 wpa_printf(MSG_DEBUG, "RSN: PMKID from assoc IE %sfound from PMKSA "
144 "cache", pmksa_set == 0 ? "" : "not ");
145 }
146
147
148 static void wpa_supplicant_event_pmkid_candidate(struct wpa_supplicant *wpa_s,
149 union wpa_event_data *data)
150 {
151 if (data == NULL) {
152 wpa_printf(MSG_DEBUG, "RSN: No data in PMKID candidate event");
153 return;
154 }
155 wpa_printf(MSG_DEBUG, "RSN: PMKID candidate event - bssid=" MACSTR
156 " index=%d preauth=%d",
157 MAC2STR(data->pmkid_candidate.bssid),
158 data->pmkid_candidate.index,
159 data->pmkid_candidate.preauth);
160
161 pmksa_candidate_add(wpa_s->wpa, data->pmkid_candidate.bssid,
162 data->pmkid_candidate.index,
163 data->pmkid_candidate.preauth);
164 }
165
166
167 static int wpa_supplicant_dynamic_keys(struct wpa_supplicant *wpa_s)
168 {
169 if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
170 wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE)
171 return 0;
172
173 #ifdef IEEE8021X_EAPOL
174 if (wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA &&
175 wpa_s->current_ssid &&
176 !(wpa_s->current_ssid->eapol_flags &
177 (EAPOL_FLAG_REQUIRE_KEY_UNICAST |
178 EAPOL_FLAG_REQUIRE_KEY_BROADCAST))) {
179 /* IEEE 802.1X, but not using dynamic WEP keys (i.e., either
180 * plaintext or static WEP keys). */
181 return 0;
182 }
183 #endif /* IEEE8021X_EAPOL */
184
185 return 1;
186 }
187
188
189 /**
190 * wpa_supplicant_scard_init - Initialize SIM/USIM access with PC/SC
191 * @wpa_s: pointer to wpa_supplicant data
192 * @ssid: Configuration data for the network
193 * Returns: 0 on success, -1 on failure
194 *
195 * This function is called when starting authentication with a network that is
196 * configured to use PC/SC for SIM/USIM access (EAP-SIM or EAP-AKA).
197 */
198 int wpa_supplicant_scard_init(struct wpa_supplicant *wpa_s,
199 struct wpa_ssid *ssid)
200 {
201 #ifdef IEEE8021X_EAPOL
202 int aka = 0, sim = 0, type;
203
204 if (ssid->eap.pcsc == NULL || wpa_s->scard != NULL)
205 return 0;
206
207 if (ssid->eap.eap_methods == NULL) {
208 sim = 1;
209 aka = 1;
210 } else {
211 struct eap_method_type *eap = ssid->eap.eap_methods;
212 while (eap->vendor != EAP_VENDOR_IETF ||
213 eap->method != EAP_TYPE_NONE) {
214 if (eap->vendor == EAP_VENDOR_IETF) {
215 if (eap->method == EAP_TYPE_SIM)
216 sim = 1;
217 else if (eap->method == EAP_TYPE_AKA)
218 aka = 1;
219 }
220 eap++;
221 }
222 }
223
224 if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_SIM) == NULL)
225 sim = 0;
226 if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_AKA) == NULL)
227 aka = 0;
228
229 if (!sim && !aka) {
230 wpa_printf(MSG_DEBUG, "Selected network is configured to use "
231 "SIM, but neither EAP-SIM nor EAP-AKA are enabled");
232 return 0;
233 }
234
235 wpa_printf(MSG_DEBUG, "Selected network is configured to use SIM "
236 "(sim=%d aka=%d) - initialize PCSC", sim, aka);
237 if (sim && aka)
238 type = SCARD_TRY_BOTH;
239 else if (aka)
240 type = SCARD_USIM_ONLY;
241 else
242 type = SCARD_GSM_SIM_ONLY;
243
244 wpa_s->scard = scard_init(type);
245 if (wpa_s->scard == NULL) {
246 wpa_printf(MSG_WARNING, "Failed to initialize SIM "
247 "(pcsc-lite)");
248 return -1;
249 }
250 wpa_sm_set_scard_ctx(wpa_s->wpa, wpa_s->scard);
251 eapol_sm_register_scard_ctx(wpa_s->eapol, wpa_s->scard);
252 #endif /* IEEE8021X_EAPOL */
253
254 return 0;
255 }
256
257
258 #ifndef CONFIG_NO_SCAN_PROCESSING
259 static int wpa_supplicant_match_privacy(struct wpa_scan_res *bss,
260 struct wpa_ssid *ssid)
261 {
262 int i, privacy = 0;
263
264 if (ssid->mixed_cell)
265 return 1;
266
267 #ifdef CONFIG_WPS
268 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS)
269 return 1;
270 #endif /* CONFIG_WPS */
271
272 for (i = 0; i < NUM_WEP_KEYS; i++) {
273 if (ssid->wep_key_len[i]) {
274 privacy = 1;
275 break;
276 }
277 }
278 #ifdef IEEE8021X_EAPOL
279 if ((ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) &&
280 ssid->eapol_flags & (EAPOL_FLAG_REQUIRE_KEY_UNICAST |
281 EAPOL_FLAG_REQUIRE_KEY_BROADCAST))
282 privacy = 1;
283 #endif /* IEEE8021X_EAPOL */
284
285 if (bss->caps & IEEE80211_CAP_PRIVACY)
286 return privacy;
287 return !privacy;
288 }
289
290
291 static int wpa_supplicant_ssid_bss_match(struct wpa_supplicant *wpa_s,
292 struct wpa_ssid *ssid,
293 struct wpa_scan_res *bss)
294 {
295 struct wpa_ie_data ie;
296 int proto_match = 0;
297 const u8 *rsn_ie, *wpa_ie;
298 int ret;
299
300 ret = wpas_wps_ssid_bss_match(wpa_s, ssid, bss);
301 if (ret >= 0)
302 return ret;
303
304 rsn_ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
305 while ((ssid->proto & WPA_PROTO_RSN) && rsn_ie) {
306 proto_match++;
307
308 if (wpa_parse_wpa_ie(rsn_ie, 2 + rsn_ie[1], &ie)) {
309 wpa_printf(MSG_DEBUG, " skip RSN IE - parse failed");
310 break;
311 }
312 if (!(ie.proto & ssid->proto)) {
313 wpa_printf(MSG_DEBUG, " skip RSN IE - proto "
314 "mismatch");
315 break;
316 }
317
318 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
319 wpa_printf(MSG_DEBUG, " skip RSN IE - PTK cipher "
320 "mismatch");
321 break;
322 }
323
324 if (!(ie.group_cipher & ssid->group_cipher)) {
325 wpa_printf(MSG_DEBUG, " skip RSN IE - GTK cipher "
326 "mismatch");
327 break;
328 }
329
330 if (!(ie.key_mgmt & ssid->key_mgmt)) {
331 wpa_printf(MSG_DEBUG, " skip RSN IE - key mgmt "
332 "mismatch");
333 break;
334 }
335
336 #ifdef CONFIG_IEEE80211W
337 if (!(ie.capabilities & WPA_CAPABILITY_MFPC) &&
338 ssid->ieee80211w == IEEE80211W_REQUIRED) {
339 wpa_printf(MSG_DEBUG, " skip RSN IE - no mgmt frame "
340 "protection");
341 break;
342 }
343 #endif /* CONFIG_IEEE80211W */
344
345 wpa_printf(MSG_DEBUG, " selected based on RSN IE");
346 return 1;
347 }
348
349 wpa_ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
350 while ((ssid->proto & WPA_PROTO_WPA) && wpa_ie) {
351 proto_match++;
352
353 if (wpa_parse_wpa_ie(wpa_ie, 2 + wpa_ie[1], &ie)) {
354 wpa_printf(MSG_DEBUG, " skip WPA IE - parse failed");
355 break;
356 }
357 if (!(ie.proto & ssid->proto)) {
358 wpa_printf(MSG_DEBUG, " skip WPA IE - proto "
359 "mismatch");
360 break;
361 }
362
363 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) {
364 wpa_printf(MSG_DEBUG, " skip WPA IE - PTK cipher "
365 "mismatch");
366 break;
367 }
368
369 if (!(ie.group_cipher & ssid->group_cipher)) {
370 wpa_printf(MSG_DEBUG, " skip WPA IE - GTK cipher "
371 "mismatch");
372 break;
373 }
374
375 if (!(ie.key_mgmt & ssid->key_mgmt)) {
376 wpa_printf(MSG_DEBUG, " skip WPA IE - key mgmt "
377 "mismatch");
378 break;
379 }
380
381 wpa_printf(MSG_DEBUG, " selected based on WPA IE");
382 return 1;
383 }
384
385 if (proto_match == 0)
386 wpa_printf(MSG_DEBUG, " skip - no WPA/RSN proto match");
387
388 return 0;
389 }
390
391
392 static struct wpa_scan_res *
393 wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s,
394 struct wpa_ssid *group,
395 struct wpa_ssid **selected_ssid)
396 {
397 struct wpa_ssid *ssid;
398 struct wpa_scan_res *bss;
399 size_t i;
400 struct wpa_blacklist *e;
401 const u8 *ie;
402
403 wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP");
404 for (i = 0; i < wpa_s->scan_res->num; i++) {
405 const u8 *ssid_;
406 u8 wpa_ie_len, rsn_ie_len, ssid_len;
407 bss = wpa_s->scan_res->res[i];
408
409 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
410 ssid_ = ie ? ie + 2 : (u8 *) "";
411 ssid_len = ie ? ie[1] : 0;
412
413 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
414 wpa_ie_len = ie ? ie[1] : 0;
415
416 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
417 rsn_ie_len = ie ? ie[1] : 0;
418
419 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
420 "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
421 (int) i, MAC2STR(bss->bssid),
422 wpa_ssid_txt(ssid_, ssid_len),
423 wpa_ie_len, rsn_ie_len, bss->caps);
424
425 e = wpa_blacklist_get(wpa_s, bss->bssid);
426 if (e && e->count > 1) {
427 wpa_printf(MSG_DEBUG, " skip - blacklisted");
428 continue;
429 }
430
431 if (ssid_len == 0) {
432 wpa_printf(MSG_DEBUG, " skip - SSID not known");
433 continue;
434 }
435
436 if (wpa_ie_len == 0 && rsn_ie_len == 0) {
437 wpa_printf(MSG_DEBUG, " skip - no WPA/RSN IE");
438 continue;
439 }
440
441 for (ssid = group; ssid; ssid = ssid->pnext) {
442 int check_ssid = 1;
443
444 if (ssid->disabled) {
445 wpa_printf(MSG_DEBUG, " skip - disabled");
446 continue;
447 }
448
449 #ifdef CONFIG_WPS
450 if (ssid->ssid_len == 0 &&
451 wpas_wps_ssid_wildcard_ok(wpa_s, ssid, bss))
452 check_ssid = 0;
453 #endif /* CONFIG_WPS */
454
455 if (check_ssid &&
456 (ssid_len != ssid->ssid_len ||
457 os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
458 wpa_printf(MSG_DEBUG, " skip - "
459 "SSID mismatch");
460 continue;
461 }
462
463 if (ssid->bssid_set &&
464 os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
465 {
466 wpa_printf(MSG_DEBUG, " skip - "
467 "BSSID mismatch");
468 continue;
469 }
470
471 if (!wpa_supplicant_ssid_bss_match(wpa_s, ssid, bss))
472 continue;
473
474 wpa_printf(MSG_DEBUG, " selected WPA AP "
475 MACSTR " ssid='%s'",
476 MAC2STR(bss->bssid),
477 wpa_ssid_txt(ssid_, ssid_len));
478 *selected_ssid = ssid;
479 return bss;
480 }
481 }
482
483 return NULL;
484 }
485
486
487 static struct wpa_scan_res *
488 wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s,
489 struct wpa_ssid *group,
490 struct wpa_ssid **selected_ssid)
491 {
492 struct wpa_ssid *ssid;
493 struct wpa_scan_res *bss;
494 size_t i;
495 struct wpa_blacklist *e;
496 const u8 *ie;
497
498 wpa_printf(MSG_DEBUG, "Try to find non-WPA AP");
499 for (i = 0; i < wpa_s->scan_res->num; i++) {
500 const u8 *ssid_;
501 u8 wpa_ie_len, rsn_ie_len, ssid_len;
502 bss = wpa_s->scan_res->res[i];
503
504 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
505 ssid_ = ie ? ie + 2 : (u8 *) "";
506 ssid_len = ie ? ie[1] : 0;
507
508 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE);
509 wpa_ie_len = ie ? ie[1] : 0;
510
511 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN);
512 rsn_ie_len = ie ? ie[1] : 0;
513
514 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' "
515 "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x",
516 (int) i, MAC2STR(bss->bssid),
517 wpa_ssid_txt(ssid_, ssid_len),
518 wpa_ie_len, rsn_ie_len, bss->caps);
519
520 e = wpa_blacklist_get(wpa_s, bss->bssid);
521 if (e && e->count > 1) {
522 wpa_printf(MSG_DEBUG, " skip - blacklisted");
523 continue;
524 }
525
526 if (ssid_len == 0) {
527 wpa_printf(MSG_DEBUG, " skip - SSID not known");
528 continue;
529 }
530
531 for (ssid = group; ssid; ssid = ssid->pnext) {
532 int check_ssid = ssid->ssid_len != 0;
533
534 if (ssid->disabled) {
535 wpa_printf(MSG_DEBUG, " skip - disabled");
536 continue;
537 }
538
539 #ifdef CONFIG_WPS
540 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
541 /* Only allow wildcard SSID match if an AP
542 * advertises active WPS operation that matches
543 * with our mode. */
544 check_ssid = 1;
545 if (ssid->ssid_len == 0 &&
546 wpas_wps_ssid_wildcard_ok(wpa_s, ssid,
547 bss))
548 check_ssid = 0;
549 }
550 #endif /* CONFIG_WPS */
551
552 if (check_ssid &&
553 (ssid_len != ssid->ssid_len ||
554 os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) {
555 wpa_printf(MSG_DEBUG, " skip - "
556 "SSID mismatch");
557 continue;
558 }
559
560 if (ssid->bssid_set &&
561 os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0)
562 {
563 wpa_printf(MSG_DEBUG, " skip - "
564 "BSSID mismatch");
565 continue;
566 }
567
568 if (!(ssid->key_mgmt & WPA_KEY_MGMT_NONE) &&
569 !(ssid->key_mgmt & WPA_KEY_MGMT_WPS) &&
570 !(ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA))
571 {
572 wpa_printf(MSG_DEBUG, " skip - "
573 "non-WPA network not allowed");
574 continue;
575 }
576
577 if ((ssid->key_mgmt &
578 (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
579 WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_FT_PSK |
580 WPA_KEY_MGMT_IEEE8021X_SHA256 |
581 WPA_KEY_MGMT_PSK_SHA256)) &&
582 (wpa_ie_len != 0 || rsn_ie_len != 0)) {
583 wpa_printf(MSG_DEBUG, " skip - "
584 "WPA network");
585 continue;
586 }
587
588 if (!wpa_supplicant_match_privacy(bss, ssid)) {
589 wpa_printf(MSG_DEBUG, " skip - "
590 "privacy mismatch");
591 continue;
592 }
593
594 if (bss->caps & IEEE80211_CAP_IBSS) {
595 wpa_printf(MSG_DEBUG, " skip - "
596 "IBSS (adhoc) network");
597 continue;
598 }
599
600 wpa_printf(MSG_DEBUG, " selected non-WPA AP "
601 MACSTR " ssid='%s'",
602 MAC2STR(bss->bssid),
603 wpa_ssid_txt(ssid_, ssid_len));
604 *selected_ssid = ssid;
605 return bss;
606 }
607 }
608
609 return NULL;
610 }
611
612
613 static struct wpa_scan_res *
614 wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s, struct wpa_ssid *group,
615 struct wpa_ssid **selected_ssid)
616 {
617 struct wpa_scan_res *selected;
618
619 wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d",
620 group->priority);
621
622 /* First, try to find WPA-enabled AP */
623 selected = wpa_supplicant_select_bss_wpa(wpa_s, group, selected_ssid);
624 if (selected)
625 return selected;
626
627 /* If no WPA-enabled AP found, try to find non-WPA AP, if configuration
628 * allows this. */
629 return wpa_supplicant_select_bss_non_wpa(wpa_s, group, selected_ssid);
630 }
631
632
633 static struct wpa_scan_res *
634 wpa_supplicant_pick_network(struct wpa_supplicant *wpa_s,
635 struct wpa_ssid **selected_ssid)
636 {
637 struct wpa_scan_res *selected = NULL;
638 int prio;
639
640 while (selected == NULL) {
641 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
642 selected = wpa_supplicant_select_bss(
643 wpa_s, wpa_s->conf->pssid[prio],
644 selected_ssid);
645 if (selected)
646 break;
647 }
648
649 if (selected == NULL && wpa_s->blacklist) {
650 wpa_printf(MSG_DEBUG, "No APs found - clear blacklist "
651 "and try again");
652 wpa_blacklist_clear(wpa_s);
653 wpa_s->blacklist_cleared++;
654 } else if (selected == NULL)
655 break;
656 }
657
658 return selected;
659 }
660
661
662 static void wpa_supplicant_req_new_scan(struct wpa_supplicant *wpa_s,
663 int timeout)
664 {
665 if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1) {
666 /*
667 * Quick recovery if the initial scan results were not
668 * complete when fetched before the first scan request.
669 */
670 wpa_s->scan_res_tried++;
671 timeout = 0;
672 } else if (!wpa_supplicant_enabled_networks(wpa_s->conf)) {
673 /*
674 * No networks are enabled; short-circuit request so
675 * we don't wait timeout seconds before transitioning
676 * to INACTIVE state.
677 */
678 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
679 return;
680 }
681 wpa_supplicant_req_scan(wpa_s, timeout, 0);
682 }
683
684
685 static void wpa_supplicant_connect(struct wpa_supplicant *wpa_s,
686 struct wpa_scan_res *selected,
687 struct wpa_ssid *ssid)
688 {
689 if (wpas_wps_scan_pbc_overlap(wpa_s, selected, ssid)) {
690 wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_OVERLAP
691 "PBC session overlap");
692 wpa_supplicant_req_new_scan(wpa_s, 10);
693 return;
694 }
695
696 /*
697 * Do not trigger new association unless the BSSID has changed or if
698 * reassociation is requested. If we are in process of associating with
699 * the selected BSSID, do not trigger new attempt.
700 */
701 if (wpa_s->reassociate ||
702 (os_memcmp(selected->bssid, wpa_s->bssid, ETH_ALEN) != 0 &&
703 (wpa_s->wpa_state != WPA_ASSOCIATING ||
704 os_memcmp(selected->bssid, wpa_s->pending_bssid, ETH_ALEN) !=
705 0))) {
706 if (wpa_supplicant_scard_init(wpa_s, ssid)) {
707 wpa_supplicant_req_new_scan(wpa_s, 10);
708 return;
709 }
710 wpa_supplicant_associate(wpa_s, selected, ssid);
711 } else {
712 wpa_printf(MSG_DEBUG, "Already associated with the selected "
713 "AP");
714 }
715 }
716
717
718 static struct wpa_ssid *
719 wpa_supplicant_pick_new_network(struct wpa_supplicant *wpa_s)
720 {
721 int prio;
722 struct wpa_ssid *ssid;
723
724 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) {
725 for (ssid = wpa_s->conf->pssid[prio]; ssid; ssid = ssid->pnext)
726 {
727 if (ssid->disabled)
728 continue;
729 if (ssid->mode == IEEE80211_MODE_IBSS ||
730 ssid->mode == IEEE80211_MODE_AP)
731 return ssid;
732 }
733 }
734 return NULL;
735 }
736
737
738 static void wpa_supplicant_rsn_preauth_scan_results(
739 struct wpa_supplicant *wpa_s)
740 {
741 int i;
742
743 if (rsn_preauth_scan_results(wpa_s->wpa) < 0)
744 return;
745
746 for (i = wpa_s->scan_res->num - 1; i >= 0; i--) {
747 const u8 *ssid, *rsn;
748 struct wpa_scan_res *r;
749
750 r = wpa_s->scan_res->res[i];
751
752 ssid = wpa_scan_get_ie(r, WLAN_EID_SSID);
753 if (ssid == NULL)
754 continue;
755
756 rsn = wpa_scan_get_ie(r, WLAN_EID_RSN);
757 if (rsn == NULL)
758 continue;
759
760 rsn_preauth_scan_result(wpa_s->wpa, r->bssid, ssid, rsn);
761 }
762
763 }
764
765
766 static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
767 union wpa_event_data *data)
768 {
769 struct wpa_scan_res *selected;
770 struct wpa_ssid *ssid = NULL;
771
772 wpa_supplicant_notify_scanning(wpa_s, 0);
773
774 if (wpa_supplicant_get_scan_results(wpa_s, data ? &data->scan_info :
775 NULL, 1) < 0) {
776 if (wpa_s->conf->ap_scan == 2)
777 return;
778 wpa_printf(MSG_DEBUG, "Failed to get scan results - try "
779 "scanning again");
780 wpa_supplicant_req_new_scan(wpa_s, 1);
781 return;
782 }
783
784 /*
785 * Don't post the results if this was the initial cached
786 * and there were no results.
787 */
788 if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1 &&
789 wpa_s->scan_res->num == 0) {
790 wpa_msg(wpa_s, MSG_DEBUG, "Cached scan results are "
791 "empty - not posting");
792 } else {
793 wpa_printf(MSG_DEBUG, "New scan results available");
794 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
795 wpas_notify_scan_results(wpa_s);
796 }
797
798 wpas_notify_scan_done(wpa_s, 1);
799
800 if ((wpa_s->conf->ap_scan == 2 && !wpas_wps_searching(wpa_s)))
801 return;
802
803 if (wpa_s->disconnected) {
804 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
805 return;
806 }
807
808 if (bgscan_notify_scan(wpa_s) == 1)
809 return;
810
811 wpa_supplicant_rsn_preauth_scan_results(wpa_s);
812
813 selected = wpa_supplicant_pick_network(wpa_s, &ssid);
814 if (selected) {
815 wpa_supplicant_connect(wpa_s, selected, ssid);
816 } else {
817 wpa_printf(MSG_DEBUG, "No suitable network found");
818 ssid = wpa_supplicant_pick_new_network(wpa_s);
819 if (ssid) {
820 wpa_printf(MSG_DEBUG, "Setup a new network");
821 wpa_supplicant_associate(wpa_s, NULL, ssid);
822 } else
823 wpa_supplicant_req_new_scan(wpa_s, 5);
824 }
825 }
826 #endif /* CONFIG_NO_SCAN_PROCESSING */
827
828
829 #ifdef CONFIG_IEEE80211R
830 static void wpa_assoc_set_ft_params(struct wpa_supplicant *wpa_s,
831 const u8 *ftie, const u8 *mdie)
832 {
833 const u8 *mobility_domain = NULL;
834 const u8 *r0kh_id = NULL;
835 size_t r0kh_id_len = 0;
836 const u8 *r1kh_id = NULL;
837 struct rsn_ftie *hdr;
838 const u8 *pos, *end;
839
840 if (mdie == NULL || ftie == NULL)
841 return;
842
843 if (mdie[1] >= MOBILITY_DOMAIN_ID_LEN) {
844 mobility_domain = mdie + 2;
845 #ifdef CONFIG_SME
846 wpa_s->sme.ft_used = 1;
847 os_memcpy(wpa_s->sme.mobility_domain, mobility_domain, 2);
848 #endif /* CONFIG_SME */
849 }
850 if (ftie[1] >= sizeof(struct rsn_ftie)) {
851 end = ftie + 2 + ftie[1];
852 hdr = (struct rsn_ftie *) (ftie + 2);
853 pos = (const u8 *) (hdr + 1);
854 while (pos + 1 < end) {
855 if (pos + 2 + pos[1] > end)
856 break;
857 if (pos[0] == FTIE_SUBELEM_R1KH_ID &&
858 pos[1] == FT_R1KH_ID_LEN)
859 r1kh_id = pos + 2;
860 else if (pos[0] == FTIE_SUBELEM_R0KH_ID &&
861 pos[1] >= 1 && pos[1] <= FT_R0KH_ID_MAX_LEN) {
862 r0kh_id = pos + 2;
863 r0kh_id_len = pos[1];
864 }
865 pos += 2 + pos[1];
866 }
867 }
868 wpa_sm_set_ft_params(wpa_s->wpa, mobility_domain, r0kh_id,
869 r0kh_id_len, r1kh_id);
870 }
871 #endif /* CONFIG_IEEE80211R */
872
873 static void wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s,
874 union wpa_event_data *data)
875 {
876 int l, len, found = 0, wpa_found, rsn_found;
877 const u8 *p;
878 #ifdef CONFIG_IEEE80211R
879 const u8 *mdie = NULL, *ftie = NULL;
880 #endif /* CONFIG_IEEE80211R */
881
882 wpa_printf(MSG_DEBUG, "Association info event");
883 if (data->assoc_info.req_ies)
884 wpa_hexdump(MSG_DEBUG, "req_ies", data->assoc_info.req_ies,
885 data->assoc_info.req_ies_len);
886 if (data->assoc_info.resp_ies)
887 wpa_hexdump(MSG_DEBUG, "resp_ies", data->assoc_info.resp_ies,
888 data->assoc_info.resp_ies_len);
889 if (data->assoc_info.beacon_ies)
890 wpa_hexdump(MSG_DEBUG, "beacon_ies",
891 data->assoc_info.beacon_ies,
892 data->assoc_info.beacon_ies_len);
893 if (data->assoc_info.freq)
894 wpa_printf(MSG_DEBUG, "freq=%u MHz", data->assoc_info.freq);
895
896 p = data->assoc_info.req_ies;
897 l = data->assoc_info.req_ies_len;
898
899 /* Go through the IEs and make a copy of the WPA/RSN IE, if present. */
900 while (p && l >= 2) {
901 len = p[1] + 2;
902 if (len > l) {
903 wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info",
904 p, l);
905 break;
906 }
907 if ((p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
908 (os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0)) ||
909 (p[0] == WLAN_EID_RSN && p[1] >= 2)) {
910 if (wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, p, len))
911 break;
912 found = 1;
913 wpa_find_assoc_pmkid(wpa_s);
914 break;
915 }
916 l -= len;
917 p += len;
918 }
919 if (!found && data->assoc_info.req_ies)
920 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
921
922 #ifdef CONFIG_IEEE80211R
923 p = data->assoc_info.resp_ies;
924 l = data->assoc_info.resp_ies_len;
925
926 /* Go through the IEs and make a copy of the FT/MD IE, if present. */
927 while (p && l >= 2) {
928 len = p[1] + 2;
929 if (len > l) {
930 wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info",
931 p, l);
932 break;
933 }
934 if (p[0] == WLAN_EID_FAST_BSS_TRANSITION)
935 ftie = p;
936 else if (p[0] == WLAN_EID_MOBILITY_DOMAIN)
937 mdie = p;
938 l -= len;
939 p += len;
940 }
941
942 wpa_assoc_set_ft_params(wpa_s, ftie, mdie);
943 #endif /* CONFIG_IEEE80211R */
944
945 /* WPA/RSN IE from Beacon/ProbeResp */
946 p = data->assoc_info.beacon_ies;
947 l = data->assoc_info.beacon_ies_len;
948
949 /* Go through the IEs and make a copy of the WPA/RSN IEs, if present.
950 */
951 wpa_found = rsn_found = 0;
952 while (p && l >= 2) {
953 len = p[1] + 2;
954 if (len > l) {
955 wpa_hexdump(MSG_DEBUG, "Truncated IE in beacon_ies",
956 p, l);
957 break;
958 }
959 if (!wpa_found &&
960 p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 &&
961 os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0) {
962 wpa_found = 1;
963 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, p, len);
964 }
965
966 if (!rsn_found &&
967 p[0] == WLAN_EID_RSN && p[1] >= 2) {
968 rsn_found = 1;
969 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, p, len);
970 }
971
972 l -= len;
973 p += len;
974 }
975
976 if (!wpa_found && data->assoc_info.beacon_ies)
977 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, NULL, 0);
978 if (!rsn_found && data->assoc_info.beacon_ies)
979 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, NULL, 0);
980 if (wpa_found || rsn_found)
981 wpa_s->ap_ies_from_associnfo = 1;
982
983 wpa_s->assoc_freq = data->assoc_info.freq;
984 }
985
986
987 static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s,
988 union wpa_event_data *data)
989 {
990 u8 bssid[ETH_ALEN];
991 int ft_completed = wpa_ft_is_completed(wpa_s->wpa);
992 int bssid_changed;
993 struct wpa_driver_capa capa;
994
995 if (data)
996 wpa_supplicant_event_associnfo(wpa_s, data);
997
998 wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED);
999 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)
1000 os_memcpy(bssid, wpa_s->bssid, ETH_ALEN);
1001 if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) ||
1002 (wpa_drv_get_bssid(wpa_s, bssid) >= 0 &&
1003 os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)) {
1004 wpa_msg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID="
1005 MACSTR, MAC2STR(bssid));
1006 bssid_changed = os_memcmp(wpa_s->bssid, bssid, ETH_ALEN);
1007 os_memcpy(wpa_s->bssid, bssid, ETH_ALEN);
1008 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
1009 if (bssid_changed)
1010 wpas_notify_bssid_changed(wpa_s);
1011
1012 if (wpa_supplicant_dynamic_keys(wpa_s) && !ft_completed) {
1013 wpa_clear_keys(wpa_s, bssid);
1014 }
1015 if (wpa_supplicant_select_config(wpa_s) < 0) {
1016 wpa_supplicant_disassociate(
1017 wpa_s, WLAN_REASON_DEAUTH_LEAVING);
1018 return;
1019 }
1020 }
1021
1022 #ifdef CONFIG_SME
1023 os_memcpy(wpa_s->sme.prev_bssid, bssid, ETH_ALEN);
1024 wpa_s->sme.prev_bssid_set = 1;
1025 #endif /* CONFIG_SME */
1026
1027 wpa_msg(wpa_s, MSG_INFO, "Associated with " MACSTR, MAC2STR(bssid));
1028 if (wpa_s->current_ssid) {
1029 /* When using scanning (ap_scan=1), SIM PC/SC interface can be
1030 * initialized before association, but for other modes,
1031 * initialize PC/SC here, if the current configuration needs
1032 * smartcard or SIM/USIM. */
1033 wpa_supplicant_scard_init(wpa_s, wpa_s->current_ssid);
1034 }
1035 wpa_sm_notify_assoc(wpa_s->wpa, bssid);
1036 l2_packet_notify_auth_start(wpa_s->l2);
1037
1038 /*
1039 * Set portEnabled first to FALSE in order to get EAP state machine out
1040 * of the SUCCESS state and eapSuccess cleared. Without this, EAPOL PAE
1041 * state machine may transit to AUTHENTICATING state based on obsolete
1042 * eapSuccess and then trigger BE_AUTH to SUCCESS and PAE to
1043 * AUTHENTICATED without ever giving chance to EAP state machine to
1044 * reset the state.
1045 */
1046 if (!ft_completed) {
1047 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE);
1048 eapol_sm_notify_portValid(wpa_s->eapol, FALSE);
1049 }
1050 if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt) || ft_completed)
1051 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE);
1052 /* 802.1X::portControl = Auto */
1053 eapol_sm_notify_portEnabled(wpa_s->eapol, TRUE);
1054 wpa_s->eapol_received = 0;
1055 if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
1056 wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE ||
1057 (wpa_s->current_ssid &&
1058 wpa_s->current_ssid->mode == IEEE80211_MODE_IBSS)) {
1059 wpa_supplicant_cancel_auth_timeout(wpa_s);
1060 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
1061 } else if (!ft_completed) {
1062 /* Timeout for receiving the first EAPOL packet */
1063 wpa_supplicant_req_auth_timeout(wpa_s, 10, 0);
1064 }
1065 wpa_supplicant_cancel_scan(wpa_s);
1066
1067 if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_4WAY_HANDSHAKE) &&
1068 wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
1069 /*
1070 * We are done; the driver will take care of RSN 4-way
1071 * handshake.
1072 */
1073 wpa_supplicant_cancel_auth_timeout(wpa_s);
1074 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED);
1075 eapol_sm_notify_portValid(wpa_s->eapol, TRUE);
1076 eapol_sm_notify_eap_success(wpa_s->eapol, TRUE);
1077 }
1078
1079 if (wpa_s->pending_eapol_rx) {
1080 struct os_time now, age;
1081 os_get_time(&now);
1082 os_time_sub(&now, &wpa_s->pending_eapol_rx_time, &age);
1083 if (age.sec == 0 && age.usec < 100000 &&
1084 os_memcmp(wpa_s->pending_eapol_rx_src, bssid, ETH_ALEN) ==
1085 0) {
1086 wpa_printf(MSG_DEBUG, "Process pending EAPOL frame "
1087 "that was received just before association "
1088 "notification");
1089 wpa_supplicant_rx_eapol(
1090 wpa_s, wpa_s->pending_eapol_rx_src,
1091 wpabuf_head(wpa_s->pending_eapol_rx),
1092 wpabuf_len(wpa_s->pending_eapol_rx));
1093 }
1094 wpabuf_free(wpa_s->pending_eapol_rx);
1095 wpa_s->pending_eapol_rx = NULL;
1096 }
1097
1098 #ifdef CONFIG_BGSCAN
1099 if (wpa_s->current_ssid != wpa_s->bgscan_ssid) {
1100 bgscan_deinit(wpa_s);
1101 if (wpa_s->current_ssid && wpa_s->current_ssid->bgscan) {
1102 if (bgscan_init(wpa_s, wpa_s->current_ssid)) {
1103 wpa_printf(MSG_DEBUG, "Failed to initialize "
1104 "bgscan");
1105 /*
1106 * Live without bgscan; it is only used as a
1107 * roaming optimization, so the initial
1108 * connection is not affected.
1109 */
1110 } else
1111 wpa_s->bgscan_ssid = wpa_s->current_ssid;
1112 } else
1113 wpa_s->bgscan_ssid = NULL;
1114 }
1115 #endif /* CONFIG_BGSCAN */
1116
1117 if ((wpa_s->key_mgmt == WPA_KEY_MGMT_NONE ||
1118 wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA) &&
1119 wpa_s->current_ssid && wpa_drv_get_capa(wpa_s, &capa) == 0 &&
1120 capa.flags & WPA_DRIVER_FLAGS_SET_KEYS_AFTER_ASSOC_DONE) {
1121 /* Set static WEP keys again */
1122 wpa_set_wep_keys(wpa_s, wpa_s->current_ssid);
1123 }
1124 }
1125
1126
1127 static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s)
1128 {
1129 const u8 *bssid;
1130 #ifdef CONFIG_SME
1131 int authenticating;
1132 u8 prev_pending_bssid[ETH_ALEN];
1133
1134 authenticating = wpa_s->wpa_state == WPA_AUTHENTICATING;
1135 os_memcpy(prev_pending_bssid, wpa_s->pending_bssid, ETH_ALEN);
1136 #endif /* CONFIG_SME */
1137
1138 if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
1139 /*
1140 * At least Host AP driver and a Prism3 card seemed to be
1141 * generating streams of disconnected events when configuring
1142 * IBSS for WPA-None. Ignore them for now.
1143 */
1144 wpa_printf(MSG_DEBUG, "Disconnect event - ignore in "
1145 "IBSS/WPA-None mode");
1146 return;
1147 }
1148
1149 if (wpa_s->wpa_state == WPA_4WAY_HANDSHAKE &&
1150 wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
1151 wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - "
1152 "pre-shared key may be incorrect");
1153 }
1154 if (wpa_s->wpa_state >= WPA_ASSOCIATED)
1155 wpa_supplicant_req_scan(wpa_s, 0, 100000);
1156 bssid = wpa_s->bssid;
1157 if (is_zero_ether_addr(bssid))
1158 bssid = wpa_s->pending_bssid;
1159 wpa_blacklist_add(wpa_s, bssid);
1160 wpa_sm_notify_disassoc(wpa_s->wpa);
1161 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_DISCONNECTED "- Disconnect event - "
1162 "remove keys");
1163 if (wpa_supplicant_dynamic_keys(wpa_s)) {
1164 wpa_s->keys_cleared = 0;
1165 wpa_clear_keys(wpa_s, wpa_s->bssid);
1166 }
1167 wpa_supplicant_mark_disassoc(wpa_s);
1168 bgscan_deinit(wpa_s);
1169 #ifdef CONFIG_SME
1170 if (authenticating &&
1171 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME)) {
1172 /*
1173 * mac80211-workaround to force deauth on failed auth cmd,
1174 * requires us to remain in authenticating state to allow the
1175 * second authentication attempt to be continued properly.
1176 */
1177 wpa_printf(MSG_DEBUG, "SME: Allow pending authentication to "
1178 "proceed after disconnection event");
1179 wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
1180 os_memcpy(wpa_s->pending_bssid, prev_pending_bssid, ETH_ALEN);
1181 }
1182 #endif /* CONFIG_SME */
1183 }
1184
1185
1186 #ifdef CONFIG_DELAYED_MIC_ERROR_REPORT
1187 static void wpa_supplicant_delayed_mic_error_report(void *eloop_ctx,
1188 void *sock_ctx)
1189 {
1190 struct wpa_supplicant *wpa_s = eloop_ctx;
1191
1192 if (!wpa_s->pending_mic_error_report)
1193 return;
1194
1195 wpa_printf(MSG_DEBUG, "WPA: Sending pending MIC error report");
1196 wpa_sm_key_request(wpa_s->wpa, 1, wpa_s->pending_mic_error_pairwise);
1197 wpa_s->pending_mic_error_report = 0;
1198 }
1199 #endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */
1200
1201
1202 static void
1203 wpa_supplicant_event_michael_mic_failure(struct wpa_supplicant *wpa_s,
1204 union wpa_event_data *data)
1205 {
1206 int pairwise;
1207 struct os_time t;
1208
1209 wpa_msg(wpa_s, MSG_WARNING, "Michael MIC failure detected");
1210 pairwise = (data && data->michael_mic_failure.unicast);
1211 os_get_time(&t);
1212 if ((wpa_s->last_michael_mic_error &&
1213 t.sec - wpa_s->last_michael_mic_error <= 60) ||
1214 wpa_s->pending_mic_error_report) {
1215 if (wpa_s->pending_mic_error_report) {
1216 /*
1217 * Send the pending MIC error report immediately since
1218 * we are going to start countermeasures and AP better
1219 * do the same.
1220 */
1221 wpa_sm_key_request(wpa_s->wpa, 1,
1222 wpa_s->pending_mic_error_pairwise);
1223 }
1224
1225 /* Send the new MIC error report immediately since we are going
1226 * to start countermeasures and AP better do the same.
1227 */
1228 wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
1229
1230 /* initialize countermeasures */
1231 wpa_s->countermeasures = 1;
1232 wpa_msg(wpa_s, MSG_WARNING, "TKIP countermeasures started");
1233
1234 /*
1235 * Need to wait for completion of request frame. We do not get
1236 * any callback for the message completion, so just wait a
1237 * short while and hope for the best. */
1238 os_sleep(0, 10000);
1239
1240 wpa_drv_set_countermeasures(wpa_s, 1);
1241 wpa_supplicant_deauthenticate(wpa_s,
1242 WLAN_REASON_MICHAEL_MIC_FAILURE);
1243 eloop_cancel_timeout(wpa_supplicant_stop_countermeasures,
1244 wpa_s, NULL);
1245 eloop_register_timeout(60, 0,
1246 wpa_supplicant_stop_countermeasures,
1247 wpa_s, NULL);
1248 /* TODO: mark the AP rejected for 60 second. STA is
1249 * allowed to associate with another AP.. */
1250 } else {
1251 #ifdef CONFIG_DELAYED_MIC_ERROR_REPORT
1252 if (wpa_s->mic_errors_seen) {
1253 /*
1254 * Reduce the effectiveness of Michael MIC error
1255 * reports as a means for attacking against TKIP if
1256 * more than one MIC failure is noticed with the same
1257 * PTK. We delay the transmission of the reports by a
1258 * random time between 0 and 60 seconds in order to
1259 * force the attacker wait 60 seconds before getting
1260 * the information on whether a frame resulted in a MIC
1261 * failure.
1262 */
1263 u8 rval[4];
1264 int sec;
1265
1266 if (os_get_random(rval, sizeof(rval)) < 0)
1267 sec = os_random() % 60;
1268 else
1269 sec = WPA_GET_BE32(rval) % 60;
1270 wpa_printf(MSG_DEBUG, "WPA: Delay MIC error report %d "
1271 "seconds", sec);
1272 wpa_s->pending_mic_error_report = 1;
1273 wpa_s->pending_mic_error_pairwise = pairwise;
1274 eloop_cancel_timeout(
1275 wpa_supplicant_delayed_mic_error_report,
1276 wpa_s, NULL);
1277 eloop_register_timeout(
1278 sec, os_random() % 1000000,
1279 wpa_supplicant_delayed_mic_error_report,
1280 wpa_s, NULL);
1281 } else {
1282 wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
1283 }
1284 #else /* CONFIG_DELAYED_MIC_ERROR_REPORT */
1285 wpa_sm_key_request(wpa_s->wpa, 1, pairwise);
1286 #endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */
1287 }
1288 wpa_s->last_michael_mic_error = t.sec;
1289 wpa_s->mic_errors_seen++;
1290 }
1291
1292
1293 #ifdef CONFIG_TERMINATE_ONLASTIF
1294 static int any_interfaces(struct wpa_supplicant *head)
1295 {
1296 struct wpa_supplicant *wpa_s;
1297
1298 for (wpa_s = head; wpa_s != NULL; wpa_s = wpa_s->next)
1299 if (!wpa_s->interface_removed)
1300 return 1;
1301 return 0;
1302 }
1303 #endif /* CONFIG_TERMINATE_ONLASTIF */
1304
1305
1306 static void
1307 wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s,
1308 union wpa_event_data *data)
1309 {
1310 if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0)
1311 return;
1312
1313 switch (data->interface_status.ievent) {
1314 case EVENT_INTERFACE_ADDED:
1315 if (!wpa_s->interface_removed)
1316 break;
1317 wpa_s->interface_removed = 0;
1318 wpa_printf(MSG_DEBUG, "Configured interface was added.");
1319 if (wpa_supplicant_driver_init(wpa_s) < 0) {
1320 wpa_printf(MSG_INFO, "Failed to initialize the driver "
1321 "after interface was added.");
1322 }
1323 break;
1324 case EVENT_INTERFACE_REMOVED:
1325 wpa_printf(MSG_DEBUG, "Configured interface was removed.");
1326 wpa_s->interface_removed = 1;
1327 wpa_supplicant_mark_disassoc(wpa_s);
1328 l2_packet_deinit(wpa_s->l2);
1329 wpa_s->l2 = NULL;
1330 #ifdef CONFIG_TERMINATE_ONLASTIF
1331 /* check if last interface */
1332 if (!any_interfaces(wpa_s->global->ifaces))
1333 eloop_terminate();
1334 #endif /* CONFIG_TERMINATE_ONLASTIF */
1335 break;
1336 }
1337 }
1338
1339
1340 #ifdef CONFIG_PEERKEY
1341 static void
1342 wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s,
1343 union wpa_event_data *data)
1344 {
1345 if (data == NULL)
1346 return;
1347 wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer);
1348 }
1349 #endif /* CONFIG_PEERKEY */
1350
1351
1352 #ifdef CONFIG_IEEE80211R
1353 static void
1354 wpa_supplicant_event_ft_response(struct wpa_supplicant *wpa_s,
1355 union wpa_event_data *data)
1356 {
1357 if (data == NULL)
1358 return;
1359
1360 if (wpa_ft_process_response(wpa_s->wpa, data->ft_ies.ies,
1361 data->ft_ies.ies_len,
1362 data->ft_ies.ft_action,
1363 data->ft_ies.target_ap,
1364 data->ft_ies.ric_ies,
1365 data->ft_ies.ric_ies_len) < 0) {
1366 /* TODO: prevent MLME/driver from trying to associate? */
1367 }
1368 }
1369 #endif /* CONFIG_IEEE80211R */
1370
1371
1372 #ifdef CONFIG_IBSS_RSN
1373 static void wpa_supplicant_event_ibss_rsn_start(struct wpa_supplicant *wpa_s,
1374 union wpa_event_data *data)
1375 {
1376 if (data == NULL)
1377 return;
1378 ibss_rsn_start(wpa_s->ibss_rsn, data->ibss_rsn_start.peer);
1379 }
1380 #endif /* CONFIG_IBSS_RSN */
1381
1382
1383 void wpa_supplicant_event(void *ctx, wpa_event_type event,
1384 union wpa_event_data *data)
1385 {
1386 struct wpa_supplicant *wpa_s = ctx;
1387
1388 switch (event) {
1389 case EVENT_AUTH:
1390 sme_event_auth(wpa_s, data);
1391 break;
1392 case EVENT_ASSOC:
1393 wpa_supplicant_event_assoc(wpa_s, data);
1394 break;
1395 case EVENT_DISASSOC:
1396 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME)
1397 sme_event_disassoc(wpa_s, data);
1398 /* fall through */
1399 case EVENT_DEAUTH:
1400 wpa_supplicant_event_disassoc(wpa_s);
1401 break;
1402 case EVENT_MICHAEL_MIC_FAILURE:
1403 wpa_supplicant_event_michael_mic_failure(wpa_s, data);
1404 break;
1405 #ifndef CONFIG_NO_SCAN_PROCESSING
1406 case EVENT_SCAN_RESULTS:
1407 wpa_supplicant_event_scan_results(wpa_s, data);
1408 break;
1409 #endif /* CONFIG_NO_SCAN_PROCESSING */
1410 case EVENT_ASSOCINFO:
1411 wpa_supplicant_event_associnfo(wpa_s, data);
1412 break;
1413 case EVENT_INTERFACE_STATUS:
1414 wpa_supplicant_event_interface_status(wpa_s, data);
1415 break;
1416 case EVENT_PMKID_CANDIDATE:
1417 wpa_supplicant_event_pmkid_candidate(wpa_s, data);
1418 break;
1419 #ifdef CONFIG_PEERKEY
1420 case EVENT_STKSTART:
1421 wpa_supplicant_event_stkstart(wpa_s, data);
1422 break;
1423 #endif /* CONFIG_PEERKEY */
1424 #ifdef CONFIG_IEEE80211R
1425 case EVENT_FT_RESPONSE:
1426 wpa_supplicant_event_ft_response(wpa_s, data);
1427 break;
1428 #endif /* CONFIG_IEEE80211R */
1429 #ifdef CONFIG_IBSS_RSN
1430 case EVENT_IBSS_RSN_START:
1431 wpa_supplicant_event_ibss_rsn_start(wpa_s, data);
1432 break;
1433 #endif /* CONFIG_IBSS_RSN */
1434 case EVENT_ASSOC_REJECT:
1435 sme_event_assoc_reject(wpa_s, data);
1436 break;
1437 case EVENT_AUTH_TIMED_OUT:
1438 sme_event_auth_timed_out(wpa_s, data);
1439 break;
1440 case EVENT_ASSOC_TIMED_OUT:
1441 sme_event_assoc_timed_out(wpa_s, data);
1442 break;
1443 #ifdef CONFIG_AP
1444 case EVENT_TX_STATUS:
1445 if (wpa_s->ap_iface == NULL)
1446 break;
1447 switch (data->tx_status.type) {
1448 case WLAN_FC_TYPE_MGMT:
1449 ap_mgmt_tx_cb(wpa_s, data->tx_status.data,
1450 data->tx_status.data_len,
1451 data->tx_status.stype,
1452 data->tx_status.ack);
1453 break;
1454 case WLAN_FC_TYPE_DATA:
1455 ap_tx_status(wpa_s, data->tx_status.dst,
1456 data->tx_status.data,
1457 data->tx_status.data_len,
1458 data->tx_status.ack);
1459 break;
1460 }
1461 break;
1462 case EVENT_RX_FROM_UNKNOWN:
1463 if (wpa_s->ap_iface == NULL)
1464 break;
1465 ap_rx_from_unknown_sta(wpa_s, data->rx_from_unknown.hdr,
1466 data->rx_from_unknown.len);
1467 break;
1468 case EVENT_RX_MGMT:
1469 if (wpa_s->ap_iface == NULL)
1470 break;
1471 ap_mgmt_rx(wpa_s, data->rx_mgmt.frame,
1472 data->rx_mgmt.frame_len, data->rx_mgmt.fi);
1473 break;
1474 #endif /* CONFIG_AP */
1475 default:
1476 wpa_printf(MSG_INFO, "Unknown event %d", event);
1477 break;
1478 }
1479 }