events.c revision 1.1
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 "ap/hostapd.h" 31#include "notify.h" 32#include "common/ieee802_11_defs.h" 33#include "blacklist.h" 34#include "wpas_glue.h" 35#include "wps_supplicant.h" 36#include "ibss_rsn.h" 37#include "sme.h" 38#include "bgscan.h" 39#include "ap.h" 40#include "bss.h" 41#include "mlme.h" 42#include "scan.h" 43 44 45static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s) 46{ 47 struct wpa_ssid *ssid, *old_ssid; 48 49 if (wpa_s->conf->ap_scan == 1 && wpa_s->current_ssid) 50 return 0; 51 52 wpa_printf(MSG_DEBUG, "Select network based on association " 53 "information"); 54 ssid = wpa_supplicant_get_ssid(wpa_s); 55 if (ssid == NULL) { 56 wpa_printf(MSG_INFO, "No network configuration found for the " 57 "current AP"); 58 return -1; 59 } 60 61 if (ssid->disabled) { 62 wpa_printf(MSG_DEBUG, "Selected network is disabled"); 63 return -1; 64 } 65 66 wpa_printf(MSG_DEBUG, "Network configuration found for the current " 67 "AP"); 68 if (ssid->key_mgmt & (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X | 69 WPA_KEY_MGMT_WPA_NONE | 70 WPA_KEY_MGMT_FT_PSK | WPA_KEY_MGMT_FT_IEEE8021X | 71 WPA_KEY_MGMT_PSK_SHA256 | 72 WPA_KEY_MGMT_IEEE8021X_SHA256)) { 73 u8 wpa_ie[80]; 74 size_t wpa_ie_len = sizeof(wpa_ie); 75 wpa_supplicant_set_suites(wpa_s, NULL, ssid, 76 wpa_ie, &wpa_ie_len); 77 } else { 78 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid); 79 } 80 81 if (wpa_s->current_ssid && wpa_s->current_ssid != ssid) 82 eapol_sm_invalidate_cached_session(wpa_s->eapol); 83 old_ssid = wpa_s->current_ssid; 84 wpa_s->current_ssid = ssid; 85 wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid); 86 wpa_supplicant_initiate_eapol(wpa_s); 87 if (old_ssid != wpa_s->current_ssid) 88 wpas_notify_network_changed(wpa_s); 89 90 return 0; 91} 92 93 94static void wpa_supplicant_stop_countermeasures(void *eloop_ctx, 95 void *sock_ctx) 96{ 97 struct wpa_supplicant *wpa_s = eloop_ctx; 98 99 if (wpa_s->countermeasures) { 100 wpa_s->countermeasures = 0; 101 wpa_drv_set_countermeasures(wpa_s, 0); 102 wpa_msg(wpa_s, MSG_INFO, "WPA: TKIP countermeasures stopped"); 103 wpa_supplicant_req_scan(wpa_s, 0, 0); 104 } 105} 106 107 108void wpa_supplicant_mark_disassoc(struct wpa_supplicant *wpa_s) 109{ 110 int bssid_changed; 111 112 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); 113 bssid_changed = !is_zero_ether_addr(wpa_s->bssid); 114 os_memset(wpa_s->bssid, 0, ETH_ALEN); 115 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN); 116 wpa_s->current_bss = NULL; 117 if (bssid_changed) 118 wpas_notify_bssid_changed(wpa_s); 119 120 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE); 121 eapol_sm_notify_portValid(wpa_s->eapol, FALSE); 122 if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) 123 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE); 124 wpa_s->ap_ies_from_associnfo = 0; 125} 126 127 128static void wpa_find_assoc_pmkid(struct wpa_supplicant *wpa_s) 129{ 130 struct wpa_ie_data ie; 131 int pmksa_set = -1; 132 size_t i; 133 134 if (wpa_sm_parse_own_wpa_ie(wpa_s->wpa, &ie) < 0 || 135 ie.pmkid == NULL) 136 return; 137 138 for (i = 0; i < ie.num_pmkid; i++) { 139 pmksa_set = pmksa_cache_set_current(wpa_s->wpa, 140 ie.pmkid + i * PMKID_LEN, 141 NULL, NULL, 0); 142 if (pmksa_set == 0) { 143 eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1); 144 break; 145 } 146 } 147 148 wpa_printf(MSG_DEBUG, "RSN: PMKID from assoc IE %sfound from PMKSA " 149 "cache", pmksa_set == 0 ? "" : "not "); 150} 151 152 153static void wpa_supplicant_event_pmkid_candidate(struct wpa_supplicant *wpa_s, 154 union wpa_event_data *data) 155{ 156 if (data == NULL) { 157 wpa_printf(MSG_DEBUG, "RSN: No data in PMKID candidate event"); 158 return; 159 } 160 wpa_printf(MSG_DEBUG, "RSN: PMKID candidate event - bssid=" MACSTR 161 " index=%d preauth=%d", 162 MAC2STR(data->pmkid_candidate.bssid), 163 data->pmkid_candidate.index, 164 data->pmkid_candidate.preauth); 165 166 pmksa_candidate_add(wpa_s->wpa, data->pmkid_candidate.bssid, 167 data->pmkid_candidate.index, 168 data->pmkid_candidate.preauth); 169} 170 171 172static int wpa_supplicant_dynamic_keys(struct wpa_supplicant *wpa_s) 173{ 174 if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE || 175 wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) 176 return 0; 177 178#ifdef IEEE8021X_EAPOL 179 if (wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA && 180 wpa_s->current_ssid && 181 !(wpa_s->current_ssid->eapol_flags & 182 (EAPOL_FLAG_REQUIRE_KEY_UNICAST | 183 EAPOL_FLAG_REQUIRE_KEY_BROADCAST))) { 184 /* IEEE 802.1X, but not using dynamic WEP keys (i.e., either 185 * plaintext or static WEP keys). */ 186 return 0; 187 } 188#endif /* IEEE8021X_EAPOL */ 189 190 return 1; 191} 192 193 194/** 195 * wpa_supplicant_scard_init - Initialize SIM/USIM access with PC/SC 196 * @wpa_s: pointer to wpa_supplicant data 197 * @ssid: Configuration data for the network 198 * Returns: 0 on success, -1 on failure 199 * 200 * This function is called when starting authentication with a network that is 201 * configured to use PC/SC for SIM/USIM access (EAP-SIM or EAP-AKA). 202 */ 203int wpa_supplicant_scard_init(struct wpa_supplicant *wpa_s, 204 struct wpa_ssid *ssid) 205{ 206#ifdef IEEE8021X_EAPOL 207 int aka = 0, sim = 0, type; 208 209 if (ssid->eap.pcsc == NULL || wpa_s->scard != NULL) 210 return 0; 211 212 if (ssid->eap.eap_methods == NULL) { 213 sim = 1; 214 aka = 1; 215 } else { 216 struct eap_method_type *eap = ssid->eap.eap_methods; 217 while (eap->vendor != EAP_VENDOR_IETF || 218 eap->method != EAP_TYPE_NONE) { 219 if (eap->vendor == EAP_VENDOR_IETF) { 220 if (eap->method == EAP_TYPE_SIM) 221 sim = 1; 222 else if (eap->method == EAP_TYPE_AKA) 223 aka = 1; 224 } 225 eap++; 226 } 227 } 228 229 if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_SIM) == NULL) 230 sim = 0; 231 if (eap_peer_get_eap_method(EAP_VENDOR_IETF, EAP_TYPE_AKA) == NULL) 232 aka = 0; 233 234 if (!sim && !aka) { 235 wpa_printf(MSG_DEBUG, "Selected network is configured to use " 236 "SIM, but neither EAP-SIM nor EAP-AKA are enabled"); 237 return 0; 238 } 239 240 wpa_printf(MSG_DEBUG, "Selected network is configured to use SIM " 241 "(sim=%d aka=%d) - initialize PCSC", sim, aka); 242 if (sim && aka) 243 type = SCARD_TRY_BOTH; 244 else if (aka) 245 type = SCARD_USIM_ONLY; 246 else 247 type = SCARD_GSM_SIM_ONLY; 248 249 wpa_s->scard = scard_init(type); 250 if (wpa_s->scard == NULL) { 251 wpa_printf(MSG_WARNING, "Failed to initialize SIM " 252 "(pcsc-lite)"); 253 return -1; 254 } 255 wpa_sm_set_scard_ctx(wpa_s->wpa, wpa_s->scard); 256 eapol_sm_register_scard_ctx(wpa_s->eapol, wpa_s->scard); 257#endif /* IEEE8021X_EAPOL */ 258 259 return 0; 260} 261 262 263#ifndef CONFIG_NO_SCAN_PROCESSING 264static int wpa_supplicant_match_privacy(struct wpa_scan_res *bss, 265 struct wpa_ssid *ssid) 266{ 267 int i, privacy = 0; 268 269 if (ssid->mixed_cell) 270 return 1; 271 272#ifdef CONFIG_WPS 273 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) 274 return 1; 275#endif /* CONFIG_WPS */ 276 277 for (i = 0; i < NUM_WEP_KEYS; i++) { 278 if (ssid->wep_key_len[i]) { 279 privacy = 1; 280 break; 281 } 282 } 283#ifdef IEEE8021X_EAPOL 284 if ((ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) && 285 ssid->eapol_flags & (EAPOL_FLAG_REQUIRE_KEY_UNICAST | 286 EAPOL_FLAG_REQUIRE_KEY_BROADCAST)) 287 privacy = 1; 288#endif /* IEEE8021X_EAPOL */ 289 290 if (bss->caps & IEEE80211_CAP_PRIVACY) 291 return privacy; 292 return !privacy; 293} 294 295 296static int wpa_supplicant_ssid_bss_match(struct wpa_supplicant *wpa_s, 297 struct wpa_ssid *ssid, 298 struct wpa_scan_res *bss) 299{ 300 struct wpa_ie_data ie; 301 int proto_match = 0; 302 const u8 *rsn_ie, *wpa_ie; 303 int ret; 304 305 ret = wpas_wps_ssid_bss_match(wpa_s, ssid, bss); 306 if (ret >= 0) 307 return ret; 308 309 rsn_ie = wpa_scan_get_ie(bss, WLAN_EID_RSN); 310 while ((ssid->proto & WPA_PROTO_RSN) && rsn_ie) { 311 proto_match++; 312 313 if (wpa_parse_wpa_ie(rsn_ie, 2 + rsn_ie[1], &ie)) { 314 wpa_printf(MSG_DEBUG, " skip RSN IE - parse failed"); 315 break; 316 } 317 if (!(ie.proto & ssid->proto)) { 318 wpa_printf(MSG_DEBUG, " skip RSN IE - proto " 319 "mismatch"); 320 break; 321 } 322 323 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) { 324 wpa_printf(MSG_DEBUG, " skip RSN IE - PTK cipher " 325 "mismatch"); 326 break; 327 } 328 329 if (!(ie.group_cipher & ssid->group_cipher)) { 330 wpa_printf(MSG_DEBUG, " skip RSN IE - GTK cipher " 331 "mismatch"); 332 break; 333 } 334 335 if (!(ie.key_mgmt & ssid->key_mgmt)) { 336 wpa_printf(MSG_DEBUG, " skip RSN IE - key mgmt " 337 "mismatch"); 338 break; 339 } 340 341#ifdef CONFIG_IEEE80211W 342 if (!(ie.capabilities & WPA_CAPABILITY_MFPC) && 343 ssid->ieee80211w == MGMT_FRAME_PROTECTION_REQUIRED) { 344 wpa_printf(MSG_DEBUG, " skip RSN IE - no mgmt frame " 345 "protection"); 346 break; 347 } 348#endif /* CONFIG_IEEE80211W */ 349 350 wpa_printf(MSG_DEBUG, " selected based on RSN IE"); 351 return 1; 352 } 353 354 wpa_ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE); 355 while ((ssid->proto & WPA_PROTO_WPA) && wpa_ie) { 356 proto_match++; 357 358 if (wpa_parse_wpa_ie(wpa_ie, 2 + wpa_ie[1], &ie)) { 359 wpa_printf(MSG_DEBUG, " skip WPA IE - parse failed"); 360 break; 361 } 362 if (!(ie.proto & ssid->proto)) { 363 wpa_printf(MSG_DEBUG, " skip WPA IE - proto " 364 "mismatch"); 365 break; 366 } 367 368 if (!(ie.pairwise_cipher & ssid->pairwise_cipher)) { 369 wpa_printf(MSG_DEBUG, " skip WPA IE - PTK cipher " 370 "mismatch"); 371 break; 372 } 373 374 if (!(ie.group_cipher & ssid->group_cipher)) { 375 wpa_printf(MSG_DEBUG, " skip WPA IE - GTK cipher " 376 "mismatch"); 377 break; 378 } 379 380 if (!(ie.key_mgmt & ssid->key_mgmt)) { 381 wpa_printf(MSG_DEBUG, " skip WPA IE - key mgmt " 382 "mismatch"); 383 break; 384 } 385 386 wpa_printf(MSG_DEBUG, " selected based on WPA IE"); 387 return 1; 388 } 389 390 if (proto_match == 0) 391 wpa_printf(MSG_DEBUG, " skip - no WPA/RSN proto match"); 392 393 return 0; 394} 395 396 397static int freq_allowed(int *freqs, int freq) 398{ 399 int i; 400 401 if (freqs == NULL) 402 return 1; 403 404 for (i = 0; freqs[i]; i++) 405 if (freqs[i] == freq) 406 return 1; 407 return 0; 408} 409 410 411static struct wpa_bss * 412wpa_supplicant_select_bss_wpa(struct wpa_supplicant *wpa_s, 413 struct wpa_scan_results *scan_res, 414 struct wpa_ssid *group, 415 struct wpa_ssid **selected_ssid) 416{ 417 struct wpa_ssid *ssid; 418 struct wpa_scan_res *bss; 419 size_t i; 420 struct wpa_blacklist *e; 421 const u8 *ie; 422 423 wpa_printf(MSG_DEBUG, "Try to find WPA-enabled AP"); 424 for (i = 0; i < scan_res->num; i++) { 425 const u8 *ssid_; 426 u8 wpa_ie_len, rsn_ie_len, ssid_len; 427 bss = scan_res->res[i]; 428 429 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID); 430 ssid_ = ie ? ie + 2 : (u8 *) ""; 431 ssid_len = ie ? ie[1] : 0; 432 433 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE); 434 wpa_ie_len = ie ? ie[1] : 0; 435 436 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN); 437 rsn_ie_len = ie ? ie[1] : 0; 438 439 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' " 440 "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x", 441 (int) i, MAC2STR(bss->bssid), 442 wpa_ssid_txt(ssid_, ssid_len), 443 wpa_ie_len, rsn_ie_len, bss->caps); 444 445 e = wpa_blacklist_get(wpa_s, bss->bssid); 446 if (e && e->count > 1) { 447 wpa_printf(MSG_DEBUG, " skip - blacklisted"); 448 continue; 449 } 450 451 if (ssid_len == 0) { 452 wpa_printf(MSG_DEBUG, " skip - SSID not known"); 453 continue; 454 } 455 456 if (wpa_ie_len == 0 && rsn_ie_len == 0) { 457 wpa_printf(MSG_DEBUG, " skip - no WPA/RSN IE"); 458 continue; 459 } 460 461 for (ssid = group; ssid; ssid = ssid->pnext) { 462 int check_ssid = 1; 463 464 if (ssid->disabled) { 465 wpa_printf(MSG_DEBUG, " skip - disabled"); 466 continue; 467 } 468 469#ifdef CONFIG_WPS 470 if (ssid->ssid_len == 0 && 471 wpas_wps_ssid_wildcard_ok(wpa_s, ssid, bss)) 472 check_ssid = 0; 473#endif /* CONFIG_WPS */ 474 475 if (check_ssid && 476 (ssid_len != ssid->ssid_len || 477 os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) { 478 wpa_printf(MSG_DEBUG, " skip - " 479 "SSID mismatch"); 480 continue; 481 } 482 483 if (ssid->bssid_set && 484 os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0) 485 { 486 wpa_printf(MSG_DEBUG, " skip - " 487 "BSSID mismatch"); 488 continue; 489 } 490 491 if (!wpa_supplicant_ssid_bss_match(wpa_s, ssid, bss)) 492 continue; 493 494 if (!freq_allowed(ssid->freq_list, bss->freq)) { 495 wpa_printf(MSG_DEBUG, " skip - " 496 "frequency not allowed"); 497 continue; 498 } 499 500 wpa_printf(MSG_DEBUG, " selected WPA AP " 501 MACSTR " ssid='%s'", 502 MAC2STR(bss->bssid), 503 wpa_ssid_txt(ssid_, ssid_len)); 504 *selected_ssid = ssid; 505 return wpa_bss_get(wpa_s, bss->bssid, ssid_, ssid_len); 506 } 507 } 508 509 return NULL; 510} 511 512 513static struct wpa_bss * 514wpa_supplicant_select_bss_non_wpa(struct wpa_supplicant *wpa_s, 515 struct wpa_scan_results *scan_res, 516 struct wpa_ssid *group, 517 struct wpa_ssid **selected_ssid) 518{ 519 struct wpa_ssid *ssid; 520 struct wpa_scan_res *bss; 521 size_t i; 522 struct wpa_blacklist *e; 523 const u8 *ie; 524 525 wpa_printf(MSG_DEBUG, "Try to find non-WPA AP"); 526 for (i = 0; i < scan_res->num; i++) { 527 const u8 *ssid_; 528 u8 wpa_ie_len, rsn_ie_len, ssid_len; 529 bss = scan_res->res[i]; 530 531 ie = wpa_scan_get_ie(bss, WLAN_EID_SSID); 532 ssid_ = ie ? ie + 2 : (u8 *) ""; 533 ssid_len = ie ? ie[1] : 0; 534 535 ie = wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE); 536 wpa_ie_len = ie ? ie[1] : 0; 537 538 ie = wpa_scan_get_ie(bss, WLAN_EID_RSN); 539 rsn_ie_len = ie ? ie[1] : 0; 540 541 wpa_printf(MSG_DEBUG, "%d: " MACSTR " ssid='%s' " 542 "wpa_ie_len=%u rsn_ie_len=%u caps=0x%x", 543 (int) i, MAC2STR(bss->bssid), 544 wpa_ssid_txt(ssid_, ssid_len), 545 wpa_ie_len, rsn_ie_len, bss->caps); 546 547 e = wpa_blacklist_get(wpa_s, bss->bssid); 548 if (e && e->count > 1) { 549 wpa_printf(MSG_DEBUG, " skip - blacklisted"); 550 continue; 551 } 552 553 if (ssid_len == 0) { 554 wpa_printf(MSG_DEBUG, " skip - SSID not known"); 555 continue; 556 } 557 558 for (ssid = group; ssid; ssid = ssid->pnext) { 559 int check_ssid = ssid->ssid_len != 0; 560 561 if (ssid->disabled) { 562 wpa_printf(MSG_DEBUG, " skip - disabled"); 563 continue; 564 } 565 566#ifdef CONFIG_WPS 567 if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) { 568 /* Only allow wildcard SSID match if an AP 569 * advertises active WPS operation that matches 570 * with our mode. */ 571 check_ssid = 1; 572 if (ssid->ssid_len == 0 && 573 wpas_wps_ssid_wildcard_ok(wpa_s, ssid, 574 bss)) 575 check_ssid = 0; 576 } 577#endif /* CONFIG_WPS */ 578 579 if (check_ssid && 580 (ssid_len != ssid->ssid_len || 581 os_memcmp(ssid_, ssid->ssid, ssid_len) != 0)) { 582 wpa_printf(MSG_DEBUG, " skip - " 583 "SSID mismatch"); 584 continue; 585 } 586 587 if (ssid->bssid_set && 588 os_memcmp(bss->bssid, ssid->bssid, ETH_ALEN) != 0) 589 { 590 wpa_printf(MSG_DEBUG, " skip - " 591 "BSSID mismatch"); 592 continue; 593 } 594 595 if (!(ssid->key_mgmt & WPA_KEY_MGMT_NONE) && 596 !(ssid->key_mgmt & WPA_KEY_MGMT_WPS) && 597 !(ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA)) 598 { 599 wpa_printf(MSG_DEBUG, " skip - " 600 "non-WPA network not allowed"); 601 continue; 602 } 603 604 if ((ssid->key_mgmt & 605 (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK | 606 WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_FT_PSK | 607 WPA_KEY_MGMT_IEEE8021X_SHA256 | 608 WPA_KEY_MGMT_PSK_SHA256)) && 609 (wpa_ie_len != 0 || rsn_ie_len != 0)) { 610 wpa_printf(MSG_DEBUG, " skip - " 611 "WPA network"); 612 continue; 613 } 614 615 if (!wpa_supplicant_match_privacy(bss, ssid)) { 616 wpa_printf(MSG_DEBUG, " skip - " 617 "privacy mismatch"); 618 continue; 619 } 620 621 if (bss->caps & IEEE80211_CAP_IBSS) { 622 wpa_printf(MSG_DEBUG, " skip - " 623 "IBSS (adhoc) network"); 624 continue; 625 } 626 627 if (!freq_allowed(ssid->freq_list, bss->freq)) { 628 wpa_printf(MSG_DEBUG, " skip - " 629 "frequency not allowed"); 630 continue; 631 } 632 633 wpa_printf(MSG_DEBUG, " selected non-WPA AP " 634 MACSTR " ssid='%s'", 635 MAC2STR(bss->bssid), 636 wpa_ssid_txt(ssid_, ssid_len)); 637 *selected_ssid = ssid; 638 return wpa_bss_get(wpa_s, bss->bssid, ssid_, ssid_len); 639 } 640 } 641 642 return NULL; 643} 644 645 646static struct wpa_bss * 647wpa_supplicant_select_bss(struct wpa_supplicant *wpa_s, 648 struct wpa_scan_results *scan_res, 649 struct wpa_ssid *group, 650 struct wpa_ssid **selected_ssid) 651{ 652 struct wpa_bss *selected; 653 654 wpa_printf(MSG_DEBUG, "Selecting BSS from priority group %d", 655 group->priority); 656 657 /* First, try to find WPA-enabled AP */ 658 selected = wpa_supplicant_select_bss_wpa(wpa_s, scan_res, group, 659 selected_ssid); 660 if (selected) 661 return selected; 662 663 /* If no WPA-enabled AP found, try to find non-WPA AP, if configuration 664 * allows this. */ 665 return wpa_supplicant_select_bss_non_wpa(wpa_s, scan_res, group, 666 selected_ssid); 667} 668 669 670static struct wpa_bss * 671wpa_supplicant_pick_network(struct wpa_supplicant *wpa_s, 672 struct wpa_scan_results *scan_res, 673 struct wpa_ssid **selected_ssid) 674{ 675 struct wpa_bss *selected = NULL; 676 int prio; 677 678 while (selected == NULL) { 679 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) { 680 selected = wpa_supplicant_select_bss( 681 wpa_s, scan_res, wpa_s->conf->pssid[prio], 682 selected_ssid); 683 if (selected) 684 break; 685 } 686 687 if (selected == NULL && wpa_s->blacklist) { 688 wpa_printf(MSG_DEBUG, "No APs found - clear blacklist " 689 "and try again"); 690 wpa_blacklist_clear(wpa_s); 691 wpa_s->blacklist_cleared++; 692 } else if (selected == NULL) 693 break; 694 } 695 696 return selected; 697} 698 699 700static void wpa_supplicant_req_new_scan(struct wpa_supplicant *wpa_s, 701 int timeout_sec, int timeout_usec) 702{ 703 if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1) { 704 /* 705 * Quick recovery if the initial scan results were not 706 * complete when fetched before the first scan request. 707 */ 708 wpa_s->scan_res_tried++; 709 timeout_sec = 0; 710 timeout_usec = 0; 711 } else if (!wpa_supplicant_enabled_networks(wpa_s->conf)) { 712 /* 713 * No networks are enabled; short-circuit request so 714 * we don't wait timeout seconds before transitioning 715 * to INACTIVE state. 716 */ 717 wpa_supplicant_set_state(wpa_s, WPA_INACTIVE); 718 return; 719 } 720 wpa_supplicant_req_scan(wpa_s, timeout_sec, timeout_usec); 721} 722 723 724void wpa_supplicant_connect(struct wpa_supplicant *wpa_s, 725 struct wpa_bss *selected, 726 struct wpa_ssid *ssid) 727{ 728 if (wpas_wps_scan_pbc_overlap(wpa_s, selected, ssid)) { 729 wpa_msg(wpa_s, MSG_INFO, WPS_EVENT_OVERLAP 730 "PBC session overlap"); 731 wpa_supplicant_req_new_scan(wpa_s, 10, 0); 732 return; 733 } 734 735 /* 736 * Do not trigger new association unless the BSSID has changed or if 737 * reassociation is requested. If we are in process of associating with 738 * the selected BSSID, do not trigger new attempt. 739 */ 740 if (wpa_s->reassociate || 741 (os_memcmp(selected->bssid, wpa_s->bssid, ETH_ALEN) != 0 && 742 (wpa_s->wpa_state != WPA_ASSOCIATING || 743 os_memcmp(selected->bssid, wpa_s->pending_bssid, ETH_ALEN) != 744 0))) { 745 if (wpa_supplicant_scard_init(wpa_s, ssid)) { 746 wpa_supplicant_req_new_scan(wpa_s, 10, 0); 747 return; 748 } 749 wpa_supplicant_associate(wpa_s, selected, ssid); 750 } else { 751 wpa_printf(MSG_DEBUG, "Already associated with the selected " 752 "AP"); 753 } 754} 755 756 757static struct wpa_ssid * 758wpa_supplicant_pick_new_network(struct wpa_supplicant *wpa_s) 759{ 760 int prio; 761 struct wpa_ssid *ssid; 762 763 for (prio = 0; prio < wpa_s->conf->num_prio; prio++) { 764 for (ssid = wpa_s->conf->pssid[prio]; ssid; ssid = ssid->pnext) 765 { 766 if (ssid->disabled) 767 continue; 768 if (ssid->mode == IEEE80211_MODE_IBSS || 769 ssid->mode == IEEE80211_MODE_AP) 770 return ssid; 771 } 772 } 773 return NULL; 774} 775 776 777/* TODO: move the rsn_preauth_scan_result*() to be called from notify.c based 778 * on BSS added and BSS changed events */ 779static void wpa_supplicant_rsn_preauth_scan_results( 780 struct wpa_supplicant *wpa_s, struct wpa_scan_results *scan_res) 781{ 782 int i; 783 784 if (rsn_preauth_scan_results(wpa_s->wpa) < 0) 785 return; 786 787 for (i = scan_res->num - 1; i >= 0; i--) { 788 const u8 *ssid, *rsn; 789 struct wpa_scan_res *r; 790 791 r = scan_res->res[i]; 792 793 ssid = wpa_scan_get_ie(r, WLAN_EID_SSID); 794 if (ssid == NULL) 795 continue; 796 797 rsn = wpa_scan_get_ie(r, WLAN_EID_RSN); 798 if (rsn == NULL) 799 continue; 800 801 rsn_preauth_scan_result(wpa_s->wpa, r->bssid, ssid, rsn); 802 } 803 804} 805 806 807static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s, 808 struct wpa_bss *selected, 809 struct wpa_ssid *ssid, 810 struct wpa_scan_results *scan_res) 811{ 812 size_t i; 813 struct wpa_scan_res *current_bss = NULL; 814 int min_diff; 815 816 if (wpa_s->reassociate) 817 return 1; /* explicit request to reassociate */ 818 if (wpa_s->wpa_state < WPA_ASSOCIATED) 819 return 1; /* we are not associated; continue */ 820 if (wpa_s->current_ssid == NULL) 821 return 1; /* unknown current SSID */ 822 if (wpa_s->current_ssid != ssid) 823 return 1; /* different network block */ 824 825 for (i = 0; i < scan_res->num; i++) { 826 struct wpa_scan_res *res = scan_res->res[i]; 827 const u8 *ie; 828 if (os_memcmp(res->bssid, wpa_s->bssid, ETH_ALEN) != 0) 829 continue; 830 831 ie = wpa_scan_get_ie(res, WLAN_EID_SSID); 832 if (ie == NULL) 833 continue; 834 if (ie[1] != wpa_s->current_ssid->ssid_len || 835 os_memcmp(ie + 2, wpa_s->current_ssid->ssid, ie[1]) != 0) 836 continue; 837 current_bss = res; 838 break; 839 } 840 841 if (!current_bss) 842 return 1; /* current BSS not seen in scan results */ 843 844 wpa_printf(MSG_DEBUG, "Considering within-ESS reassociation"); 845 wpa_printf(MSG_DEBUG, "Current BSS: " MACSTR " level=%d", 846 MAC2STR(current_bss->bssid), current_bss->level); 847 wpa_printf(MSG_DEBUG, "Selected BSS: " MACSTR " level=%d", 848 MAC2STR(selected->bssid), selected->level); 849 850 if (wpa_s->current_ssid->bssid_set && 851 os_memcmp(selected->bssid, wpa_s->current_ssid->bssid, ETH_ALEN) == 852 0) { 853 wpa_printf(MSG_DEBUG, "Allow reassociation - selected BSS has " 854 "preferred BSSID"); 855 return 1; 856 } 857 858 min_diff = 2; 859 if (current_bss->level < 0) { 860 if (current_bss->level < -85) 861 min_diff = 1; 862 else if (current_bss->level < -80) 863 min_diff = 2; 864 else if (current_bss->level < -75) 865 min_diff = 3; 866 else if (current_bss->level < -70) 867 min_diff = 4; 868 else 869 min_diff = 5; 870 } 871 if (abs(current_bss->level - selected->level) < min_diff) { 872 wpa_printf(MSG_DEBUG, "Skip roam - too small difference in " 873 "signal level"); 874 return 0; 875 } 876 877 return 1; 878} 879 880 881static void wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s, 882 union wpa_event_data *data) 883{ 884 struct wpa_bss *selected; 885 struct wpa_ssid *ssid = NULL; 886 struct wpa_scan_results *scan_res; 887 888 wpa_supplicant_notify_scanning(wpa_s, 0); 889 890 scan_res = wpa_supplicant_get_scan_results(wpa_s, 891 data ? &data->scan_info : 892 NULL, 1); 893 if (scan_res == NULL) { 894 if (wpa_s->conf->ap_scan == 2) 895 return; 896 wpa_printf(MSG_DEBUG, "Failed to get scan results - try " 897 "scanning again"); 898 wpa_supplicant_req_new_scan(wpa_s, 1, 0); 899 return; 900 } 901 902 if (wpa_s->scan_res_handler) { 903 wpa_s->scan_res_handler(wpa_s, scan_res); 904 wpa_s->scan_res_handler = NULL; 905 wpa_scan_results_free(scan_res); 906 return; 907 } 908 909 /* 910 * Don't post the results if this was the initial cached 911 * and there were no results. 912 */ 913 if (wpa_s->scan_res_tried == 1 && wpa_s->conf->ap_scan == 1 && 914 scan_res->num == 0) { 915 wpa_msg(wpa_s, MSG_DEBUG, "Cached scan results are " 916 "empty - not posting"); 917 } else { 918 wpa_printf(MSG_DEBUG, "New scan results available"); 919 wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS); 920 wpas_notify_scan_results(wpa_s); 921 } 922 923 wpas_notify_scan_done(wpa_s, 1); 924 925 if ((wpa_s->conf->ap_scan == 2 && !wpas_wps_searching(wpa_s))) { 926 wpa_scan_results_free(scan_res); 927 return; 928 } 929 930 if (wpa_s->disconnected) { 931 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED); 932 wpa_scan_results_free(scan_res); 933 return; 934 } 935 936 if (bgscan_notify_scan(wpa_s) == 1) { 937 wpa_scan_results_free(scan_res); 938 return; 939 } 940 941 wpa_supplicant_rsn_preauth_scan_results(wpa_s, scan_res); 942 943 selected = wpa_supplicant_pick_network(wpa_s, scan_res, &ssid); 944 945 if (selected) { 946 int skip; 947 skip = !wpa_supplicant_need_to_roam(wpa_s, selected, ssid, 948 scan_res); 949 wpa_scan_results_free(scan_res); 950 if (skip) 951 return; 952 wpa_supplicant_connect(wpa_s, selected, ssid); 953 } else { 954 wpa_scan_results_free(scan_res); 955 wpa_printf(MSG_DEBUG, "No suitable network found"); 956 ssid = wpa_supplicant_pick_new_network(wpa_s); 957 if (ssid) { 958 wpa_printf(MSG_DEBUG, "Setup a new network"); 959 wpa_supplicant_associate(wpa_s, NULL, ssid); 960 } else { 961 int timeout_sec = 5; 962 int timeout_usec = 0; 963 wpa_supplicant_req_new_scan(wpa_s, timeout_sec, 964 timeout_usec); 965 } 966 } 967} 968#endif /* CONFIG_NO_SCAN_PROCESSING */ 969 970 971static int wpa_supplicant_event_associnfo(struct wpa_supplicant *wpa_s, 972 union wpa_event_data *data) 973{ 974 int l, len, found = 0, wpa_found, rsn_found; 975 const u8 *p; 976 977 wpa_printf(MSG_DEBUG, "Association info event"); 978 if (data->assoc_info.req_ies) 979 wpa_hexdump(MSG_DEBUG, "req_ies", data->assoc_info.req_ies, 980 data->assoc_info.req_ies_len); 981 if (data->assoc_info.resp_ies) 982 wpa_hexdump(MSG_DEBUG, "resp_ies", data->assoc_info.resp_ies, 983 data->assoc_info.resp_ies_len); 984 if (data->assoc_info.beacon_ies) 985 wpa_hexdump(MSG_DEBUG, "beacon_ies", 986 data->assoc_info.beacon_ies, 987 data->assoc_info.beacon_ies_len); 988 if (data->assoc_info.freq) 989 wpa_printf(MSG_DEBUG, "freq=%u MHz", data->assoc_info.freq); 990 991 p = data->assoc_info.req_ies; 992 l = data->assoc_info.req_ies_len; 993 994 /* Go through the IEs and make a copy of the WPA/RSN IE, if present. */ 995 while (p && l >= 2) { 996 len = p[1] + 2; 997 if (len > l) { 998 wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info", 999 p, l); 1000 break; 1001 } 1002 if ((p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 && 1003 (os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0)) || 1004 (p[0] == WLAN_EID_RSN && p[1] >= 2)) { 1005 if (wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, p, len)) 1006 break; 1007 found = 1; 1008 wpa_find_assoc_pmkid(wpa_s); 1009 break; 1010 } 1011 l -= len; 1012 p += len; 1013 } 1014 if (!found && data->assoc_info.req_ies) 1015 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0); 1016 1017#ifdef CONFIG_IEEE80211R 1018#ifdef CONFIG_SME 1019 if (wpa_s->sme.auth_alg == WPA_AUTH_ALG_FT) { 1020 u8 bssid[ETH_ALEN]; 1021 if (wpa_drv_get_bssid(wpa_s, bssid) < 0 || 1022 wpa_ft_validate_reassoc_resp(wpa_s->wpa, 1023 data->assoc_info.resp_ies, 1024 data->assoc_info.resp_ies_len, 1025 bssid) < 0) { 1026 wpa_printf(MSG_DEBUG, "FT: Validation of " 1027 "Reassociation Response failed"); 1028 wpa_supplicant_deauthenticate( 1029 wpa_s, WLAN_REASON_INVALID_IE); 1030 return -1; 1031 } 1032 } 1033 1034 p = data->assoc_info.resp_ies; 1035 l = data->assoc_info.resp_ies_len; 1036 1037 /* Go through the IEs and make a copy of the MDIE, if present. */ 1038 while (p && l >= 2) { 1039 len = p[1] + 2; 1040 if (len > l) { 1041 wpa_hexdump(MSG_DEBUG, "Truncated IE in assoc_info", 1042 p, l); 1043 break; 1044 } 1045 if (p[0] == WLAN_EID_MOBILITY_DOMAIN && 1046 p[1] >= MOBILITY_DOMAIN_ID_LEN) { 1047 wpa_s->sme.ft_used = 1; 1048 os_memcpy(wpa_s->sme.mobility_domain, p + 2, 1049 MOBILITY_DOMAIN_ID_LEN); 1050 break; 1051 } 1052 l -= len; 1053 p += len; 1054 } 1055#endif /* CONFIG_SME */ 1056 1057 wpa_sm_set_ft_params(wpa_s->wpa, data->assoc_info.resp_ies, 1058 data->assoc_info.resp_ies_len); 1059#endif /* CONFIG_IEEE80211R */ 1060 1061 /* WPA/RSN IE from Beacon/ProbeResp */ 1062 p = data->assoc_info.beacon_ies; 1063 l = data->assoc_info.beacon_ies_len; 1064 1065 /* Go through the IEs and make a copy of the WPA/RSN IEs, if present. 1066 */ 1067 wpa_found = rsn_found = 0; 1068 while (p && l >= 2) { 1069 len = p[1] + 2; 1070 if (len > l) { 1071 wpa_hexdump(MSG_DEBUG, "Truncated IE in beacon_ies", 1072 p, l); 1073 break; 1074 } 1075 if (!wpa_found && 1076 p[0] == WLAN_EID_VENDOR_SPECIFIC && p[1] >= 6 && 1077 os_memcmp(&p[2], "\x00\x50\xF2\x01\x01\x00", 6) == 0) { 1078 wpa_found = 1; 1079 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, p, len); 1080 } 1081 1082 if (!rsn_found && 1083 p[0] == WLAN_EID_RSN && p[1] >= 2) { 1084 rsn_found = 1; 1085 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, p, len); 1086 } 1087 1088 l -= len; 1089 p += len; 1090 } 1091 1092 if (!wpa_found && data->assoc_info.beacon_ies) 1093 wpa_sm_set_ap_wpa_ie(wpa_s->wpa, NULL, 0); 1094 if (!rsn_found && data->assoc_info.beacon_ies) 1095 wpa_sm_set_ap_rsn_ie(wpa_s->wpa, NULL, 0); 1096 if (wpa_found || rsn_found) 1097 wpa_s->ap_ies_from_associnfo = 1; 1098 1099 wpa_s->assoc_freq = data->assoc_info.freq; 1100 1101 return 0; 1102} 1103 1104 1105static void wpa_supplicant_event_assoc(struct wpa_supplicant *wpa_s, 1106 union wpa_event_data *data) 1107{ 1108 u8 bssid[ETH_ALEN]; 1109 int ft_completed; 1110 int bssid_changed; 1111 struct wpa_driver_capa capa; 1112 1113#ifdef CONFIG_AP 1114 if (wpa_s->ap_iface) { 1115 hostapd_notif_assoc(wpa_s->ap_iface->bss[0], 1116 data->assoc_info.addr, 1117 data->assoc_info.req_ies, 1118 data->assoc_info.req_ies_len); 1119 return; 1120 } 1121#endif /* CONFIG_AP */ 1122 1123 ft_completed = wpa_ft_is_completed(wpa_s->wpa); 1124 if (data && wpa_supplicant_event_associnfo(wpa_s, data) < 0) 1125 return; 1126 1127 wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATED); 1128 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) 1129 os_memcpy(bssid, wpa_s->bssid, ETH_ALEN); 1130 if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME) || 1131 (wpa_drv_get_bssid(wpa_s, bssid) >= 0 && 1132 os_memcmp(bssid, wpa_s->bssid, ETH_ALEN) != 0)) { 1133 wpa_msg(wpa_s, MSG_DEBUG, "Associated to a new BSS: BSSID=" 1134 MACSTR, MAC2STR(bssid)); 1135 bssid_changed = os_memcmp(wpa_s->bssid, bssid, ETH_ALEN); 1136 os_memcpy(wpa_s->bssid, bssid, ETH_ALEN); 1137 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN); 1138 if (bssid_changed) 1139 wpas_notify_bssid_changed(wpa_s); 1140 1141 if (wpa_supplicant_dynamic_keys(wpa_s) && !ft_completed) { 1142 wpa_clear_keys(wpa_s, bssid); 1143 } 1144 if (wpa_supplicant_select_config(wpa_s) < 0) { 1145 wpa_supplicant_disassociate( 1146 wpa_s, WLAN_REASON_DEAUTH_LEAVING); 1147 return; 1148 } 1149 if (wpa_s->current_ssid) { 1150 struct wpa_bss *bss = NULL; 1151 struct wpa_ssid *ssid = wpa_s->current_ssid; 1152 if (ssid->ssid_len > 0) 1153 bss = wpa_bss_get(wpa_s, bssid, 1154 ssid->ssid, ssid->ssid_len); 1155 if (!bss) 1156 bss = wpa_bss_get_bssid(wpa_s, bssid); 1157 if (bss) 1158 wpa_s->current_bss = bss; 1159 } 1160 } 1161 1162#ifdef CONFIG_SME 1163 os_memcpy(wpa_s->sme.prev_bssid, bssid, ETH_ALEN); 1164 wpa_s->sme.prev_bssid_set = 1; 1165#endif /* CONFIG_SME */ 1166 1167 wpa_msg(wpa_s, MSG_INFO, "Associated with " MACSTR, MAC2STR(bssid)); 1168 if (wpa_s->current_ssid) { 1169 /* When using scanning (ap_scan=1), SIM PC/SC interface can be 1170 * initialized before association, but for other modes, 1171 * initialize PC/SC here, if the current configuration needs 1172 * smartcard or SIM/USIM. */ 1173 wpa_supplicant_scard_init(wpa_s, wpa_s->current_ssid); 1174 } 1175 wpa_sm_notify_assoc(wpa_s->wpa, bssid); 1176 l2_packet_notify_auth_start(wpa_s->l2); 1177 1178 /* 1179 * Set portEnabled first to FALSE in order to get EAP state machine out 1180 * of the SUCCESS state and eapSuccess cleared. Without this, EAPOL PAE 1181 * state machine may transit to AUTHENTICATING state based on obsolete 1182 * eapSuccess and then trigger BE_AUTH to SUCCESS and PAE to 1183 * AUTHENTICATED without ever giving chance to EAP state machine to 1184 * reset the state. 1185 */ 1186 if (!ft_completed) { 1187 eapol_sm_notify_portEnabled(wpa_s->eapol, FALSE); 1188 eapol_sm_notify_portValid(wpa_s->eapol, FALSE); 1189 } 1190 if (wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt) || ft_completed) 1191 eapol_sm_notify_eap_success(wpa_s->eapol, FALSE); 1192 /* 802.1X::portControl = Auto */ 1193 eapol_sm_notify_portEnabled(wpa_s->eapol, TRUE); 1194 wpa_s->eapol_received = 0; 1195 if (wpa_s->key_mgmt == WPA_KEY_MGMT_NONE || 1196 wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE || 1197 (wpa_s->current_ssid && 1198 wpa_s->current_ssid->mode == IEEE80211_MODE_IBSS)) { 1199 wpa_supplicant_cancel_auth_timeout(wpa_s); 1200 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED); 1201 } else if (!ft_completed) { 1202 /* Timeout for receiving the first EAPOL packet */ 1203 wpa_supplicant_req_auth_timeout(wpa_s, 10, 0); 1204 } 1205 wpa_supplicant_cancel_scan(wpa_s); 1206 1207 if ((wpa_s->drv_flags & WPA_DRIVER_FLAGS_4WAY_HANDSHAKE) && 1208 wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) { 1209 /* 1210 * We are done; the driver will take care of RSN 4-way 1211 * handshake. 1212 */ 1213 wpa_supplicant_cancel_auth_timeout(wpa_s); 1214 wpa_supplicant_set_state(wpa_s, WPA_COMPLETED); 1215 eapol_sm_notify_portValid(wpa_s->eapol, TRUE); 1216 eapol_sm_notify_eap_success(wpa_s->eapol, TRUE); 1217 } 1218 1219 if (wpa_s->pending_eapol_rx) { 1220 struct os_time now, age; 1221 os_get_time(&now); 1222 os_time_sub(&now, &wpa_s->pending_eapol_rx_time, &age); 1223 if (age.sec == 0 && age.usec < 100000 && 1224 os_memcmp(wpa_s->pending_eapol_rx_src, bssid, ETH_ALEN) == 1225 0) { 1226 wpa_printf(MSG_DEBUG, "Process pending EAPOL frame " 1227 "that was received just before association " 1228 "notification"); 1229 wpa_supplicant_rx_eapol( 1230 wpa_s, wpa_s->pending_eapol_rx_src, 1231 wpabuf_head(wpa_s->pending_eapol_rx), 1232 wpabuf_len(wpa_s->pending_eapol_rx)); 1233 } 1234 wpabuf_free(wpa_s->pending_eapol_rx); 1235 wpa_s->pending_eapol_rx = NULL; 1236 } 1237 1238#ifdef CONFIG_BGSCAN 1239 if (wpa_s->current_ssid != wpa_s->bgscan_ssid) { 1240 bgscan_deinit(wpa_s); 1241 if (wpa_s->current_ssid && wpa_s->current_ssid->bgscan) { 1242 if (bgscan_init(wpa_s, wpa_s->current_ssid)) { 1243 wpa_printf(MSG_DEBUG, "Failed to initialize " 1244 "bgscan"); 1245 /* 1246 * Live without bgscan; it is only used as a 1247 * roaming optimization, so the initial 1248 * connection is not affected. 1249 */ 1250 } else 1251 wpa_s->bgscan_ssid = wpa_s->current_ssid; 1252 } else 1253 wpa_s->bgscan_ssid = NULL; 1254 } 1255#endif /* CONFIG_BGSCAN */ 1256 1257 if ((wpa_s->key_mgmt == WPA_KEY_MGMT_NONE || 1258 wpa_s->key_mgmt == WPA_KEY_MGMT_IEEE8021X_NO_WPA) && 1259 wpa_s->current_ssid && wpa_drv_get_capa(wpa_s, &capa) == 0 && 1260 capa.flags & WPA_DRIVER_FLAGS_SET_KEYS_AFTER_ASSOC_DONE) { 1261 /* Set static WEP keys again */ 1262 wpa_set_wep_keys(wpa_s, wpa_s->current_ssid); 1263 } 1264} 1265 1266 1267static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s, 1268 u16 reason_code) 1269{ 1270 const u8 *bssid; 1271#ifdef CONFIG_SME 1272 int authenticating; 1273 u8 prev_pending_bssid[ETH_ALEN]; 1274 1275 authenticating = wpa_s->wpa_state == WPA_AUTHENTICATING; 1276 os_memcpy(prev_pending_bssid, wpa_s->pending_bssid, ETH_ALEN); 1277#endif /* CONFIG_SME */ 1278 1279 if (wpa_s->key_mgmt == WPA_KEY_MGMT_WPA_NONE) { 1280 /* 1281 * At least Host AP driver and a Prism3 card seemed to be 1282 * generating streams of disconnected events when configuring 1283 * IBSS for WPA-None. Ignore them for now. 1284 */ 1285 wpa_printf(MSG_DEBUG, "Disconnect event - ignore in " 1286 "IBSS/WPA-None mode"); 1287 return; 1288 } 1289 1290 if (wpa_s->wpa_state == WPA_4WAY_HANDSHAKE && 1291 wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) { 1292 wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - " 1293 "pre-shared key may be incorrect"); 1294 } 1295 if (wpa_s->wpa_state >= WPA_ASSOCIATED) 1296 wpa_supplicant_req_scan(wpa_s, 0, 100000); 1297 bssid = wpa_s->bssid; 1298 if (is_zero_ether_addr(bssid)) 1299 bssid = wpa_s->pending_bssid; 1300 wpa_blacklist_add(wpa_s, bssid); 1301 wpa_sm_notify_disassoc(wpa_s->wpa); 1302 wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_DISCONNECTED "bssid=" MACSTR 1303 " reason=%d", 1304 MAC2STR(bssid), reason_code); 1305 if (wpa_supplicant_dynamic_keys(wpa_s)) { 1306 wpa_printf(MSG_DEBUG, "Disconnect event - remove keys"); 1307 wpa_s->keys_cleared = 0; 1308 wpa_clear_keys(wpa_s, wpa_s->bssid); 1309 } 1310 wpa_supplicant_mark_disassoc(wpa_s); 1311 bgscan_deinit(wpa_s); 1312#ifdef CONFIG_SME 1313 if (authenticating && 1314 (wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME)) { 1315 /* 1316 * mac80211-workaround to force deauth on failed auth cmd, 1317 * requires us to remain in authenticating state to allow the 1318 * second authentication attempt to be continued properly. 1319 */ 1320 wpa_printf(MSG_DEBUG, "SME: Allow pending authentication to " 1321 "proceed after disconnection event"); 1322 wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING); 1323 os_memcpy(wpa_s->pending_bssid, prev_pending_bssid, ETH_ALEN); 1324 } 1325#endif /* CONFIG_SME */ 1326} 1327 1328 1329#ifdef CONFIG_DELAYED_MIC_ERROR_REPORT 1330static void wpa_supplicant_delayed_mic_error_report(void *eloop_ctx, 1331 void *sock_ctx) 1332{ 1333 struct wpa_supplicant *wpa_s = eloop_ctx; 1334 1335 if (!wpa_s->pending_mic_error_report) 1336 return; 1337 1338 wpa_printf(MSG_DEBUG, "WPA: Sending pending MIC error report"); 1339 wpa_sm_key_request(wpa_s->wpa, 1, wpa_s->pending_mic_error_pairwise); 1340 wpa_s->pending_mic_error_report = 0; 1341} 1342#endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */ 1343 1344 1345static void 1346wpa_supplicant_event_michael_mic_failure(struct wpa_supplicant *wpa_s, 1347 union wpa_event_data *data) 1348{ 1349 int pairwise; 1350 struct os_time t; 1351 1352 wpa_msg(wpa_s, MSG_WARNING, "Michael MIC failure detected"); 1353 pairwise = (data && data->michael_mic_failure.unicast); 1354 os_get_time(&t); 1355 if ((wpa_s->last_michael_mic_error && 1356 t.sec - wpa_s->last_michael_mic_error <= 60) || 1357 wpa_s->pending_mic_error_report) { 1358 if (wpa_s->pending_mic_error_report) { 1359 /* 1360 * Send the pending MIC error report immediately since 1361 * we are going to start countermeasures and AP better 1362 * do the same. 1363 */ 1364 wpa_sm_key_request(wpa_s->wpa, 1, 1365 wpa_s->pending_mic_error_pairwise); 1366 } 1367 1368 /* Send the new MIC error report immediately since we are going 1369 * to start countermeasures and AP better do the same. 1370 */ 1371 wpa_sm_key_request(wpa_s->wpa, 1, pairwise); 1372 1373 /* initialize countermeasures */ 1374 wpa_s->countermeasures = 1; 1375 wpa_msg(wpa_s, MSG_WARNING, "TKIP countermeasures started"); 1376 1377 /* 1378 * Need to wait for completion of request frame. We do not get 1379 * any callback for the message completion, so just wait a 1380 * short while and hope for the best. */ 1381 os_sleep(0, 10000); 1382 1383 wpa_drv_set_countermeasures(wpa_s, 1); 1384 wpa_supplicant_deauthenticate(wpa_s, 1385 WLAN_REASON_MICHAEL_MIC_FAILURE); 1386 eloop_cancel_timeout(wpa_supplicant_stop_countermeasures, 1387 wpa_s, NULL); 1388 eloop_register_timeout(60, 0, 1389 wpa_supplicant_stop_countermeasures, 1390 wpa_s, NULL); 1391 /* TODO: mark the AP rejected for 60 second. STA is 1392 * allowed to associate with another AP.. */ 1393 } else { 1394#ifdef CONFIG_DELAYED_MIC_ERROR_REPORT 1395 if (wpa_s->mic_errors_seen) { 1396 /* 1397 * Reduce the effectiveness of Michael MIC error 1398 * reports as a means for attacking against TKIP if 1399 * more than one MIC failure is noticed with the same 1400 * PTK. We delay the transmission of the reports by a 1401 * random time between 0 and 60 seconds in order to 1402 * force the attacker wait 60 seconds before getting 1403 * the information on whether a frame resulted in a MIC 1404 * failure. 1405 */ 1406 u8 rval[4]; 1407 int sec; 1408 1409 if (os_get_random(rval, sizeof(rval)) < 0) 1410 sec = os_random() % 60; 1411 else 1412 sec = WPA_GET_BE32(rval) % 60; 1413 wpa_printf(MSG_DEBUG, "WPA: Delay MIC error report %d " 1414 "seconds", sec); 1415 wpa_s->pending_mic_error_report = 1; 1416 wpa_s->pending_mic_error_pairwise = pairwise; 1417 eloop_cancel_timeout( 1418 wpa_supplicant_delayed_mic_error_report, 1419 wpa_s, NULL); 1420 eloop_register_timeout( 1421 sec, os_random() % 1000000, 1422 wpa_supplicant_delayed_mic_error_report, 1423 wpa_s, NULL); 1424 } else { 1425 wpa_sm_key_request(wpa_s->wpa, 1, pairwise); 1426 } 1427#else /* CONFIG_DELAYED_MIC_ERROR_REPORT */ 1428 wpa_sm_key_request(wpa_s->wpa, 1, pairwise); 1429#endif /* CONFIG_DELAYED_MIC_ERROR_REPORT */ 1430 } 1431 wpa_s->last_michael_mic_error = t.sec; 1432 wpa_s->mic_errors_seen++; 1433} 1434 1435 1436#ifdef CONFIG_TERMINATE_ONLASTIF 1437static int any_interfaces(struct wpa_supplicant *head) 1438{ 1439 struct wpa_supplicant *wpa_s; 1440 1441 for (wpa_s = head; wpa_s != NULL; wpa_s = wpa_s->next) 1442 if (!wpa_s->interface_removed) 1443 return 1; 1444 return 0; 1445} 1446#endif /* CONFIG_TERMINATE_ONLASTIF */ 1447 1448 1449static void 1450wpa_supplicant_event_interface_status(struct wpa_supplicant *wpa_s, 1451 union wpa_event_data *data) 1452{ 1453 if (os_strcmp(wpa_s->ifname, data->interface_status.ifname) != 0) 1454 return; 1455 1456 switch (data->interface_status.ievent) { 1457 case EVENT_INTERFACE_ADDED: 1458 if (!wpa_s->interface_removed) 1459 break; 1460 wpa_s->interface_removed = 0; 1461 wpa_printf(MSG_DEBUG, "Configured interface was added."); 1462 if (wpa_supplicant_driver_init(wpa_s) < 0) { 1463 wpa_printf(MSG_INFO, "Failed to initialize the driver " 1464 "after interface was added."); 1465 } 1466 break; 1467 case EVENT_INTERFACE_REMOVED: 1468 wpa_printf(MSG_DEBUG, "Configured interface was removed."); 1469 wpa_s->interface_removed = 1; 1470 wpa_supplicant_mark_disassoc(wpa_s); 1471 l2_packet_deinit(wpa_s->l2); 1472 wpa_s->l2 = NULL; 1473#ifdef CONFIG_TERMINATE_ONLASTIF 1474 /* check if last interface */ 1475 if (!any_interfaces(wpa_s->global->ifaces)) 1476 eloop_terminate(); 1477#endif /* CONFIG_TERMINATE_ONLASTIF */ 1478 break; 1479 } 1480} 1481 1482 1483#ifdef CONFIG_PEERKEY 1484static void 1485wpa_supplicant_event_stkstart(struct wpa_supplicant *wpa_s, 1486 union wpa_event_data *data) 1487{ 1488 if (data == NULL) 1489 return; 1490 wpa_sm_stkstart(wpa_s->wpa, data->stkstart.peer); 1491} 1492#endif /* CONFIG_PEERKEY */ 1493 1494 1495#ifdef CONFIG_IEEE80211R 1496static void 1497wpa_supplicant_event_ft_response(struct wpa_supplicant *wpa_s, 1498 union wpa_event_data *data) 1499{ 1500 if (data == NULL) 1501 return; 1502 1503 if (wpa_ft_process_response(wpa_s->wpa, data->ft_ies.ies, 1504 data->ft_ies.ies_len, 1505 data->ft_ies.ft_action, 1506 data->ft_ies.target_ap, 1507 data->ft_ies.ric_ies, 1508 data->ft_ies.ric_ies_len) < 0) { 1509 /* TODO: prevent MLME/driver from trying to associate? */ 1510 } 1511} 1512#endif /* CONFIG_IEEE80211R */ 1513 1514 1515#ifdef CONFIG_IBSS_RSN 1516static void wpa_supplicant_event_ibss_rsn_start(struct wpa_supplicant *wpa_s, 1517 union wpa_event_data *data) 1518{ 1519 if (data == NULL) 1520 return; 1521 ibss_rsn_start(wpa_s->ibss_rsn, data->ibss_rsn_start.peer); 1522} 1523#endif /* CONFIG_IBSS_RSN */ 1524 1525 1526#ifdef CONFIG_IEEE80211R 1527static void ft_rx_action(struct wpa_supplicant *wpa_s, const u8 *data, 1528 size_t len) 1529{ 1530 const u8 *sta_addr, *target_ap_addr; 1531 u16 status; 1532 1533 wpa_hexdump(MSG_MSGDUMP, "FT: RX Action", data, len); 1534 if (!(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME)) 1535 return; /* only SME case supported for now */ 1536 if (len < 1 + 2 * ETH_ALEN + 2) 1537 return; 1538 if (data[0] != 2) 1539 return; /* Only FT Action Response is supported for now */ 1540 sta_addr = data + 1; 1541 target_ap_addr = data + 1 + ETH_ALEN; 1542 status = WPA_GET_LE16(data + 1 + 2 * ETH_ALEN); 1543 wpa_printf(MSG_DEBUG, "FT: Received FT Action Response: STA " MACSTR 1544 " TargetAP " MACSTR " status %u", 1545 MAC2STR(sta_addr), MAC2STR(target_ap_addr), status); 1546 1547 if (os_memcmp(sta_addr, wpa_s->own_addr, ETH_ALEN) != 0) { 1548 wpa_printf(MSG_DEBUG, "FT: Foreign STA Address " MACSTR 1549 " in FT Action Response", MAC2STR(sta_addr)); 1550 return; 1551 } 1552 1553 if (status) { 1554 wpa_printf(MSG_DEBUG, "FT: FT Action Response indicates " 1555 "failure (status code %d)", status); 1556 /* TODO: report error to FT code(?) */ 1557 return; 1558 } 1559 1560 if (wpa_ft_process_response(wpa_s->wpa, data + 1 + 2 * ETH_ALEN + 2, 1561 len - (1 + 2 * ETH_ALEN + 2), 1, 1562 target_ap_addr, NULL, 0) < 0) 1563 return; 1564 1565#ifdef CONFIG_SME 1566 { 1567 struct wpa_bss *bss; 1568 bss = wpa_bss_get_bssid(wpa_s, target_ap_addr); 1569 if (bss) 1570 wpa_s->sme.freq = bss->freq; 1571 wpa_s->sme.auth_alg = WPA_AUTH_ALG_FT; 1572 sme_associate(wpa_s, WPAS_MODE_INFRA, target_ap_addr, 1573 WLAN_AUTH_FT); 1574 } 1575#endif /* CONFIG_SME */ 1576} 1577#endif /* CONFIG_IEEE80211R */ 1578 1579 1580void wpa_supplicant_event(void *ctx, enum wpa_event_type event, 1581 union wpa_event_data *data) 1582{ 1583 struct wpa_supplicant *wpa_s = ctx; 1584 u16 reason_code = 0; 1585 1586 switch (event) { 1587 case EVENT_AUTH: 1588 sme_event_auth(wpa_s, data); 1589 break; 1590 case EVENT_ASSOC: 1591 wpa_supplicant_event_assoc(wpa_s, data); 1592 break; 1593 case EVENT_DISASSOC: 1594 wpa_printf(MSG_DEBUG, "Disassociation notification"); 1595#ifdef CONFIG_AP 1596 if (wpa_s->ap_iface && data) { 1597 hostapd_notif_disassoc(wpa_s->ap_iface->bss[0], 1598 data->disassoc_info.addr); 1599 break; 1600 } 1601#endif /* CONFIG_AP */ 1602 if (data) 1603 reason_code = data->deauth_info.reason_code; 1604 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_SME) 1605 sme_event_disassoc(wpa_s, data); 1606 /* fall through */ 1607 case EVENT_DEAUTH: 1608 if (event == EVENT_DEAUTH) { 1609 wpa_printf(MSG_DEBUG, "Deauthentication notification"); 1610 if (data) 1611 reason_code = data->deauth_info.reason_code; 1612 } 1613#ifdef CONFIG_AP 1614 if (wpa_s->ap_iface && data) { 1615 hostapd_notif_disassoc(wpa_s->ap_iface->bss[0], 1616 data->deauth_info.addr); 1617 break; 1618 } 1619#endif /* CONFIG_AP */ 1620 wpa_supplicant_event_disassoc(wpa_s, reason_code); 1621 break; 1622 case EVENT_MICHAEL_MIC_FAILURE: 1623 wpa_supplicant_event_michael_mic_failure(wpa_s, data); 1624 break; 1625#ifndef CONFIG_NO_SCAN_PROCESSING 1626 case EVENT_SCAN_RESULTS: 1627 wpa_supplicant_event_scan_results(wpa_s, data); 1628 break; 1629#endif /* CONFIG_NO_SCAN_PROCESSING */ 1630 case EVENT_ASSOCINFO: 1631 wpa_supplicant_event_associnfo(wpa_s, data); 1632 break; 1633 case EVENT_INTERFACE_STATUS: 1634 wpa_supplicant_event_interface_status(wpa_s, data); 1635 break; 1636 case EVENT_PMKID_CANDIDATE: 1637 wpa_supplicant_event_pmkid_candidate(wpa_s, data); 1638 break; 1639#ifdef CONFIG_PEERKEY 1640 case EVENT_STKSTART: 1641 wpa_supplicant_event_stkstart(wpa_s, data); 1642 break; 1643#endif /* CONFIG_PEERKEY */ 1644#ifdef CONFIG_IEEE80211R 1645 case EVENT_FT_RESPONSE: 1646 wpa_supplicant_event_ft_response(wpa_s, data); 1647 break; 1648#endif /* CONFIG_IEEE80211R */ 1649#ifdef CONFIG_IBSS_RSN 1650 case EVENT_IBSS_RSN_START: 1651 wpa_supplicant_event_ibss_rsn_start(wpa_s, data); 1652 break; 1653#endif /* CONFIG_IBSS_RSN */ 1654 case EVENT_ASSOC_REJECT: 1655 sme_event_assoc_reject(wpa_s, data); 1656 break; 1657 case EVENT_AUTH_TIMED_OUT: 1658 sme_event_auth_timed_out(wpa_s, data); 1659 break; 1660 case EVENT_ASSOC_TIMED_OUT: 1661 sme_event_assoc_timed_out(wpa_s, data); 1662 break; 1663#ifdef CONFIG_AP 1664 case EVENT_TX_STATUS: 1665 if (wpa_s->ap_iface == NULL) 1666 break; 1667 switch (data->tx_status.type) { 1668 case WLAN_FC_TYPE_MGMT: 1669 ap_mgmt_tx_cb(wpa_s, data->tx_status.data, 1670 data->tx_status.data_len, 1671 data->tx_status.stype, 1672 data->tx_status.ack); 1673 break; 1674 case WLAN_FC_TYPE_DATA: 1675 ap_tx_status(wpa_s, data->tx_status.dst, 1676 data->tx_status.data, 1677 data->tx_status.data_len, 1678 data->tx_status.ack); 1679 break; 1680 } 1681 break; 1682 case EVENT_RX_FROM_UNKNOWN: 1683 if (wpa_s->ap_iface == NULL) 1684 break; 1685 ap_rx_from_unknown_sta(wpa_s, data->rx_from_unknown.frame, 1686 data->rx_from_unknown.len); 1687 break; 1688 case EVENT_RX_MGMT: 1689 if (wpa_s->ap_iface == NULL) 1690 break; 1691 ap_mgmt_rx(wpa_s, &data->rx_mgmt); 1692 break; 1693#endif /* CONFIG_AP */ 1694 case EVENT_RX_ACTION: 1695 wpa_printf(MSG_DEBUG, "Received Action frame: SA=" MACSTR 1696 " Category=%u DataLen=%d freq=%d MHz", 1697 MAC2STR(data->rx_action.sa), 1698 data->rx_action.category, (int) data->rx_action.len, 1699 data->rx_action.freq); 1700#ifdef CONFIG_IEEE80211R 1701 if (data->rx_action.category == WLAN_ACTION_FT) { 1702 ft_rx_action(wpa_s, data->rx_action.data, 1703 data->rx_action.len); 1704 break; 1705 } 1706#endif /* CONFIG_IEEE80211R */ 1707 break; 1708#ifdef CONFIG_CLIENT_MLME 1709 case EVENT_MLME_RX: { 1710 struct ieee80211_rx_status rx_status; 1711 os_memset(&rx_status, 0, sizeof(rx_status)); 1712 rx_status.freq = data->mlme_rx.freq; 1713 rx_status.channel = data->mlme_rx.channel; 1714 rx_status.ssi = data->mlme_rx.ssi; 1715 ieee80211_sta_rx(wpa_s, data->mlme_rx.buf, data->mlme_rx.len, 1716 &rx_status); 1717 break; 1718 } 1719#endif /* CONFIG_CLIENT_MLME */ 1720 case EVENT_EAPOL_RX: 1721 wpa_supplicant_rx_eapol(wpa_s, data->eapol_rx.src, 1722 data->eapol_rx.data, 1723 data->eapol_rx.data_len); 1724 break; 1725 case EVENT_SIGNAL_CHANGE: 1726 bgscan_notify_signal_change( 1727 wpa_s, data->signal_change.above_threshold); 1728 break; 1729 default: 1730 wpa_printf(MSG_INFO, "Unknown event %d", event); 1731 break; 1732 } 1733} 1734