2 * Host AP (software wireless LAN access point) user space daemon for
3 * Host AP kernel driver / IEEE 802.11 Management
4 * Copyright (c) 2002-2005, Jouni Malinen <jkmaline@cc.hut.fi>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Alternatively, this software may be distributed under the terms of BSD
13 * See README and COPYING for more details.
19 #include <sys/socket.h>
21 #include <netinet/in.h>
22 #include <arpa/inet.h>
27 #include "ieee802_11.h"
29 #include "radius_client.h"
30 #include "ieee802_11_auth.h"
34 #include "ieee802_1x.h"
36 #include "accounting.h"
38 #include "hostap_common.h"
41 static u8 * hostapd_eid_supp_rates(hostapd *hapd, u8 *eid)
45 *pos++ = WLAN_EID_SUPP_RATES;
47 *pos++ = 0x82; /* 1 Mbps, base set */
48 *pos++ = 0x84; /* 2 Mbps, base set */
49 *pos++ = 0x0b; /* 5.5 Mbps */
50 *pos++ = 0x16; /* 11 Mbps */
56 static u16 hostapd_own_capab_info(hostapd *hapd)
58 int capab = WLAN_CAPABILITY_ESS;
59 if (hapd->conf->wpa ||
60 (hapd->conf->ieee802_1x &&
61 (hapd->conf->default_wep_key_len ||
62 hapd->conf->individual_wep_key_len)))
63 capab |= WLAN_CAPABILITY_PRIVACY;
68 static const u8 WPA_OUI_TYPE[] = { 0x00, 0x50, 0xf2, 1 };
70 ParseRes ieee802_11_parse_elems(struct hostapd_data *hapd, u8 *start,
72 struct ieee802_11_elems *elems,
79 memset(elems, 0, sizeof(*elems));
90 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
91 "IEEE 802.11 element parse "
92 "failed (id=%d elen=%d "
94 id, elen, (unsigned long) left);
95 if (HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_MINIMAL))
96 hostapd_hexdump("IEs", start, len);
104 elems->ssid_len = elen;
106 case WLAN_EID_SUPP_RATES:
107 elems->supp_rates = pos;
108 elems->supp_rates_len = elen;
110 case WLAN_EID_FH_PARAMS:
111 elems->fh_params = pos;
112 elems->fh_params_len = elen;
114 case WLAN_EID_DS_PARAMS:
115 elems->ds_params = pos;
116 elems->ds_params_len = elen;
118 case WLAN_EID_CF_PARAMS:
119 elems->cf_params = pos;
120 elems->cf_params_len = elen;
124 elems->tim_len = elen;
126 case WLAN_EID_IBSS_PARAMS:
127 elems->ibss_params = pos;
128 elems->ibss_params_len = elen;
130 case WLAN_EID_CHALLENGE:
131 elems->challenge = pos;
132 elems->challenge_len = elen;
134 case WLAN_EID_GENERIC:
135 if (elen > 4 && memcmp(pos, WPA_OUI_TYPE, 4) == 0) {
137 elems->wpa_ie_len = elen;
138 } else if (show_errors) {
139 HOSTAPD_DEBUG(HOSTAPD_DEBUG_EXCESSIVE,
140 "IEEE 802.11 element parse "
141 "ignored unknown generic element"
142 " (id=%d elen=%d OUI:type="
143 "%02x-%02x-%02x:%d)\n",
145 elen >= 1 ? pos[0] : 0,
146 elen >= 2 ? pos[1] : 0,
147 elen >= 3 ? pos[2] : 0,
148 elen >= 4 ? pos[3] : 0);
156 elems->rsn_ie_len = elen;
162 HOSTAPD_DEBUG(HOSTAPD_DEBUG_EXCESSIVE,
163 "IEEE 802.11 element parse ignored "
164 "unknown element (id=%d elen=%d)\n",
176 return unknown ? ParseUnknown : ParseOK;
180 static void ieee802_11_print_ssid(const u8 *ssid, u8 len)
183 for (i = 0; i < len; i++) {
184 if (ssid[i] >= 32 && ssid[i] < 127)
185 printf("%c", ssid[i]);
187 printf("<%02x>", ssid[i]);
192 static void ieee802_11_sta_authenticate(void *eloop_ctx, void *timeout_ctx)
194 hostapd *hapd = eloop_ctx;
195 struct ieee80211_mgmt mgmt;
197 if (hapd->assoc_ap_state == WAIT_BEACON)
198 hapd->assoc_ap_state = AUTHENTICATE;
199 if (hapd->assoc_ap_state != AUTHENTICATE)
202 printf("Authenticate with AP " MACSTR " SSID=",
203 MAC2STR(hapd->conf->assoc_ap_addr));
204 ieee802_11_print_ssid((u8 *) hapd->assoc_ap_ssid,
205 hapd->assoc_ap_ssid_len);
206 printf(" (as station)\n");
208 memset(&mgmt, 0, sizeof(mgmt));
209 mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
211 /* Request TX callback */
212 mgmt.frame_control |= host_to_le16(BIT(1));
213 memcpy(mgmt.da, hapd->conf->assoc_ap_addr, ETH_ALEN);
214 memcpy(mgmt.sa, hapd->own_addr, ETH_ALEN);
215 memcpy(mgmt.bssid, hapd->conf->assoc_ap_addr, ETH_ALEN);
216 mgmt.u.auth.auth_alg = host_to_le16(WLAN_AUTH_OPEN);
217 mgmt.u.auth.auth_transaction = host_to_le16(1);
218 mgmt.u.auth.status_code = host_to_le16(0);
219 if (hostapd_send_mgmt_frame(hapd, &mgmt, IEEE80211_HDRLEN +
220 sizeof(mgmt.u.auth), 0) < 0)
221 perror("ieee802_11_sta_authenticate: send");
223 /* Try to authenticate again, if this attempt fails or times out. */
224 eloop_register_timeout(5, 0, ieee802_11_sta_authenticate, hapd, NULL);
228 static void ieee802_11_sta_associate(void *eloop_ctx, void *timeout_ctx)
230 hostapd *hapd = eloop_ctx;
232 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) buf;
235 if (hapd->assoc_ap_state == AUTHENTICATE)
236 hapd->assoc_ap_state = ASSOCIATE;
237 if (hapd->assoc_ap_state != ASSOCIATE)
240 printf("Associate with AP " MACSTR " SSID=",
241 MAC2STR(hapd->conf->assoc_ap_addr));
242 ieee802_11_print_ssid((u8 *) hapd->assoc_ap_ssid,
243 hapd->assoc_ap_ssid_len);
244 printf(" (as station)\n");
246 memset(mgmt, 0, sizeof(*mgmt));
247 mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
248 WLAN_FC_STYPE_ASSOC_REQ);
249 /* Request TX callback */
250 mgmt->frame_control |= host_to_le16(BIT(1));
251 memcpy(mgmt->da, hapd->conf->assoc_ap_addr, ETH_ALEN);
252 memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
253 memcpy(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN);
254 mgmt->u.assoc_req.capab_info = host_to_le16(0);
255 mgmt->u.assoc_req.listen_interval = host_to_le16(1);
256 p = &mgmt->u.assoc_req.variable[0];
258 *p++ = WLAN_EID_SSID;
259 *p++ = hapd->assoc_ap_ssid_len;
260 memcpy(p, hapd->assoc_ap_ssid, hapd->assoc_ap_ssid_len);
261 p += hapd->assoc_ap_ssid_len;
263 p = hostapd_eid_supp_rates(hapd, p);
265 if (hostapd_send_mgmt_frame(hapd, mgmt, p - (u8 *) mgmt, 0) < 0)
266 perror("ieee802_11_sta_associate: send");
268 /* Try to authenticate again, if this attempt fails or times out. */
269 eloop_register_timeout(5, 0, ieee802_11_sta_associate, hapd, NULL);
273 static u16 auth_shared_key(hostapd *hapd, struct sta_info *sta,
274 u16 auth_transaction, u8 *challenge, int iswep)
276 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
278 "authentication (shared key, transaction %d)",
281 if (auth_transaction == 1) {
282 if (!sta->challenge) {
283 /* Generate a pseudo-random challenge */
287 sta->challenge = malloc(WLAN_AUTH_CHALLENGE_LEN);
289 return WLAN_STATUS_UNSPECIFIED_FAILURE;
290 memset(sta->challenge, 0, WLAN_AUTH_CHALLENGE_LEN);
294 memcpy(key, &now, 4);
295 memcpy(key + 4, &r, 4);
296 rc4(sta->challenge, WLAN_AUTH_CHALLENGE_LEN,
302 if (auth_transaction != 3)
303 return WLAN_STATUS_UNSPECIFIED_FAILURE;
306 if (!iswep || !sta->challenge || !challenge ||
307 memcmp(sta->challenge, challenge, WLAN_AUTH_CHALLENGE_LEN)) {
308 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
310 "shared key authentication - invalid "
311 "challenge-response");
312 return WLAN_STATUS_CHALLENGE_FAIL;
315 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
317 "authentication OK (shared key)");
318 #ifdef IEEE80211_REQUIRE_AUTH_ACK
319 /* Station will be marked authenticated if it ACKs the
320 * authentication reply. */
322 sta->flags |= WLAN_STA_AUTH;
323 wpa_sm_event(hapd, sta, WPA_AUTH);
325 free(sta->challenge);
326 sta->challenge = NULL;
332 static void send_auth_reply(hostapd *hapd, struct ieee80211_mgmt *mgmt,
333 u16 auth_alg, u16 auth_transaction, u16 resp,
336 u8 buf[IEEE80211_HDRLEN + sizeof(mgmt->u.auth) + 2 +
337 WLAN_AUTH_CHALLENGE_LEN];
338 struct ieee80211_mgmt *reply;
341 memset(buf, 0, sizeof(buf));
342 reply = (struct ieee80211_mgmt *) buf;
343 reply->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
345 /* Request TX callback */
346 reply->frame_control |= host_to_le16(BIT(1));
347 memcpy(reply->da, mgmt->sa, ETH_ALEN);
348 memcpy(reply->sa, hapd->own_addr, ETH_ALEN);
349 memcpy(reply->bssid, mgmt->bssid, ETH_ALEN);
351 reply->u.auth.auth_alg = host_to_le16(auth_alg);
352 reply->u.auth.auth_transaction = host_to_le16(auth_transaction);
353 reply->u.auth.status_code = host_to_le16(resp);
354 rlen = IEEE80211_HDRLEN + sizeof(reply->u.auth);
355 if (auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 2 &&
357 u8 *p = reply->u.auth.variable;
358 *p++ = WLAN_EID_CHALLENGE;
359 *p++ = WLAN_AUTH_CHALLENGE_LEN;
360 memcpy(p, challenge, WLAN_AUTH_CHALLENGE_LEN);
361 rlen += 2 + WLAN_AUTH_CHALLENGE_LEN;
365 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
366 "authentication reply: STA=" MACSTR " auth_alg=%d "
367 "auth_transaction=%d resp=%d%s\n",
368 MAC2STR(mgmt->sa), auth_alg, auth_transaction,
369 resp, challenge ? " challenge" : "");
370 if (hostapd_send_mgmt_frame(hapd, reply, rlen, 0) < 0)
371 perror("send_auth_reply: send");
375 static void handle_auth(hostapd *hapd, struct ieee80211_mgmt *mgmt, size_t len)
377 u16 auth_alg, auth_transaction, status_code;
378 u16 resp = WLAN_STATUS_SUCCESS;
379 struct sta_info *sta = NULL;
382 u8 *challenge = NULL;
383 u32 session_timeout, acct_interim_interval;
385 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.auth)) {
386 printf("handle_auth - too short payload (len=%lu)\n",
387 (unsigned long) len);
391 auth_alg = le_to_host16(mgmt->u.auth.auth_alg);
392 auth_transaction = le_to_host16(mgmt->u.auth.auth_transaction);
393 status_code = le_to_host16(mgmt->u.auth.status_code);
394 fc = le_to_host16(mgmt->frame_control);
396 if (len >= IEEE80211_HDRLEN + sizeof(mgmt->u.auth) +
397 2 + WLAN_AUTH_CHALLENGE_LEN &&
398 mgmt->u.auth.variable[0] == WLAN_EID_CHALLENGE &&
399 mgmt->u.auth.variable[1] == WLAN_AUTH_CHALLENGE_LEN)
400 challenge = &mgmt->u.auth.variable[2];
402 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
403 "authentication: STA=" MACSTR " auth_alg=%d "
404 "auth_transaction=%d status_code=%d wep=%d%s\n",
405 MAC2STR(mgmt->sa), auth_alg, auth_transaction,
406 status_code, !!(fc & WLAN_FC_ISWEP),
407 challenge ? " challenge" : "");
409 if (hapd->assoc_ap_state == AUTHENTICATE && auth_transaction == 2 &&
410 memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0 &&
411 memcmp(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
412 if (status_code != 0) {
413 printf("Authentication (as station) with AP "
414 MACSTR " failed (status_code=%d)\n",
415 MAC2STR(hapd->conf->assoc_ap_addr),
419 printf("Authenticated (as station) with AP " MACSTR "\n",
420 MAC2STR(hapd->conf->assoc_ap_addr));
421 ieee802_11_sta_associate(hapd, NULL);
425 if (hapd->tkip_countermeasures) {
426 resp = WLAN_REASON_MICHAEL_MIC_FAILURE;
430 if (!(((hapd->conf->auth_algs & HOSTAPD_AUTH_OPEN) &&
431 auth_alg == WLAN_AUTH_OPEN) ||
432 ((hapd->conf->auth_algs & HOSTAPD_AUTH_SHARED_KEY) &&
433 auth_alg == WLAN_AUTH_SHARED_KEY))) {
434 printf("Unsupported authentication algorithm (%d)\n",
436 resp = WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG;
440 if (!(auth_transaction == 1 ||
441 (auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 3))) {
442 printf("Unknown authentication transaction number (%d)\n",
444 resp = WLAN_STATUS_UNKNOWN_AUTH_TRANSACTION;
448 if (memcmp(mgmt->sa, hapd->own_addr, ETH_ALEN) == 0) {
449 printf("Station " MACSTR " not allowed to authenticate.\n",
451 resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
455 res = hostapd_allowed_address(hapd, mgmt->sa, (u8 *) mgmt, len,
457 &acct_interim_interval);
458 if (res == HOSTAPD_ACL_REJECT) {
459 printf("Station " MACSTR " not allowed to authenticate.\n",
461 resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
464 if (res == HOSTAPD_ACL_PENDING) {
465 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "Authentication frame "
466 "from " MACSTR " waiting for an external "
467 "authentication\n", MAC2STR(mgmt->sa));
468 /* Authentication code will re-send the authentication frame
469 * after it has received (and cached) information from the
470 * external source. */
474 sta = ap_sta_add(hapd, mgmt->sa);
476 resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
479 sta->flags &= ~WLAN_STA_PREAUTH;
480 ieee802_1x_notify_pre_auth(sta->eapol_sm, 0);
482 if (hapd->conf->radius->acct_interim_interval == 0 &&
483 acct_interim_interval)
484 sta->acct_interim_interval = acct_interim_interval;
485 if (res == HOSTAPD_ACL_ACCEPT_TIMEOUT)
486 ap_sta_session_timeout(hapd, sta, session_timeout);
488 ap_sta_no_session_timeout(hapd, sta);
492 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
494 "authentication OK (open system)");
495 #ifdef IEEE80211_REQUIRE_AUTH_ACK
496 /* Station will be marked authenticated if it ACKs the
497 * authentication reply. */
499 sta->flags |= WLAN_STA_AUTH;
500 wpa_sm_event(hapd, sta, WPA_AUTH);
503 case WLAN_AUTH_SHARED_KEY:
504 resp = auth_shared_key(hapd, sta, auth_transaction, challenge,
510 send_auth_reply(hapd, mgmt, auth_alg, auth_transaction + 1, resp,
511 sta ? sta->challenge : NULL);
515 static void handle_assoc(hostapd *hapd, struct ieee80211_mgmt *mgmt,
516 size_t len, int reassoc)
518 u16 capab_info, listen_interval;
519 u16 resp = WLAN_STATUS_SUCCESS;
522 int send_deauth = 0, send_len, left, i;
523 struct sta_info *sta;
524 struct ieee802_11_elems elems;
526 if (len < IEEE80211_HDRLEN + (reassoc ? sizeof(mgmt->u.reassoc_req) :
527 sizeof(mgmt->u.assoc_req))) {
528 printf("handle_assoc(reassoc=%d) - too short payload (len=%lu)"
529 "\n", reassoc, (unsigned long) len);
534 capab_info = le_to_host16(mgmt->u.reassoc_req.capab_info);
535 listen_interval = le_to_host16(
536 mgmt->u.reassoc_req.listen_interval);
537 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
538 "reassociation request: STA=" MACSTR
539 " capab_info=0x%02x "
540 "listen_interval=%d current_ap=" MACSTR "\n",
541 MAC2STR(mgmt->sa), capab_info, listen_interval,
542 MAC2STR(mgmt->u.reassoc_req.current_ap));
543 left = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.reassoc_req));
544 pos = mgmt->u.reassoc_req.variable;
546 capab_info = le_to_host16(mgmt->u.assoc_req.capab_info);
547 listen_interval = le_to_host16(
548 mgmt->u.assoc_req.listen_interval);
549 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
550 "association request: STA=" MACSTR
551 " capab_info=0x%02x listen_interval=%d\n",
552 MAC2STR(mgmt->sa), capab_info, listen_interval);
553 left = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.assoc_req));
554 pos = mgmt->u.assoc_req.variable;
557 sta = ap_get_sta(hapd, mgmt->sa);
558 if (sta == NULL || (sta->flags & WLAN_STA_AUTH) == 0) {
559 printf("STA " MACSTR " trying to associate before "
560 "authentication\n", MAC2STR(mgmt->sa));
562 printf(" sta: addr=" MACSTR " aid=%d flags=0x%04x\n",
563 MAC2STR(sta->addr), sta->aid, sta->flags);
566 resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
570 if (hapd->tkip_countermeasures) {
571 resp = WLAN_REASON_MICHAEL_MIC_FAILURE;
575 sta->capability = capab_info;
577 /* followed by SSID and Supported rates */
578 if (ieee802_11_parse_elems(hapd, pos, left, &elems, 1) == ParseFailed
580 printf("STA " MACSTR " sent invalid association request\n",
582 resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
586 if (elems.ssid_len != hapd->conf->ssid_len ||
587 memcmp(elems.ssid, hapd->conf->ssid, elems.ssid_len) != 0) {
588 printf("Station " MACSTR " tried to associate with "
589 "unknown SSID '", MAC2STR(sta->addr));
590 ieee802_11_print_ssid(elems.ssid, elems.ssid_len);
592 resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
596 if (elems.supp_rates) {
597 if (elems.supp_rates_len > sizeof(sta->supported_rates)) {
598 printf("STA " MACSTR ": Invalid supported rates "
599 "element length %d\n", MAC2STR(sta->addr),
600 elems.supp_rates_len);
601 resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
605 memset(sta->supported_rates, 0, sizeof(sta->supported_rates));
606 memcpy(sta->supported_rates, elems.supp_rates,
607 elems.supp_rates_len);
609 sta->tx_supp_rates = 0;
610 for (i = 0; i < elems.supp_rates_len; i++) {
611 if ((sta->supported_rates[i] & 0x7f) == 2)
612 sta->tx_supp_rates |= WLAN_RATE_1M;
613 if ((sta->supported_rates[i] & 0x7f) == 4)
614 sta->tx_supp_rates |= WLAN_RATE_2M;
615 if ((sta->supported_rates[i] & 0x7f) == 11)
616 sta->tx_supp_rates |= WLAN_RATE_5M5;
617 if ((sta->supported_rates[i] & 0x7f) == 22)
618 sta->tx_supp_rates |= WLAN_RATE_11M;
621 sta->tx_supp_rates = 0xff;
623 if ((hapd->conf->wpa & HOSTAPD_WPA_VERSION_WPA2) && elems.rsn_ie) {
624 wpa_ie = elems.rsn_ie;
625 wpa_ie_len = elems.rsn_ie_len;
626 } else if ((hapd->conf->wpa & HOSTAPD_WPA_VERSION_WPA) &&
628 wpa_ie = elems.wpa_ie;
629 wpa_ie_len = elems.wpa_ie_len;
634 if (hapd->conf->wpa && wpa_ie == NULL) {
635 printf("STA " MACSTR ": No WPA/RSN IE in association "
636 "request\n", MAC2STR(sta->addr));
637 resp = WLAN_STATUS_INVALID_IE;
641 if (hapd->conf->wpa) {
645 res = wpa_validate_wpa_ie(hapd, sta, wpa_ie, wpa_ie_len,
647 HOSTAPD_WPA_VERSION_WPA2 :
648 HOSTAPD_WPA_VERSION_WPA);
649 if (res == WPA_INVALID_GROUP)
650 resp = WLAN_STATUS_GROUP_CIPHER_NOT_VALID;
651 else if (res == WPA_INVALID_PAIRWISE)
652 resp = WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
653 else if (res == WPA_INVALID_AKMP)
654 resp = WLAN_STATUS_AKMP_NOT_VALID;
655 else if (res != WPA_IE_OK)
656 resp = WLAN_STATUS_INVALID_IE;
657 if (resp != WLAN_STATUS_SUCCESS)
660 sta->wpa_ie = malloc(wpa_ie_len);
661 if (sta->wpa_ie == NULL) {
662 resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
665 sta->wpa_ie_len = wpa_ie_len;
666 memcpy(sta->wpa_ie, wpa_ie, wpa_ie_len);
669 /* get a unique AID */
671 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
672 " old AID %d\n", sta->aid);
674 for (sta->aid = 1; sta->aid <= MAX_AID_TABLE_SIZE; sta->aid++)
675 if (hapd->sta_aid[sta->aid - 1] == NULL)
677 if (sta->aid > MAX_AID_TABLE_SIZE) {
679 resp = WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA;
680 printf(" no room for more AIDs\n");
683 hapd->sta_aid[sta->aid - 1] = sta;
684 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
685 " new AID %d\n", sta->aid);
689 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
691 "association OK (aid %d)", sta->aid);
692 /* Station will be marked associated, after it acknowledges AssocResp
695 if (sta->last_assoc_req)
696 free(sta->last_assoc_req);
697 sta->last_assoc_req = (struct ieee80211_mgmt *) malloc(len);
698 if (sta->last_assoc_req)
699 memcpy(sta->last_assoc_req, mgmt, len);
701 /* Make sure that the previously registered inactivity timer will not
702 * remove the STA immediately. */
703 sta->timeout_next = STA_NULLFUNC;
707 /* use the queued buffer for transmission because it is large enough
708 * and not needed anymore */
709 mgmt->frame_control =
710 IEEE80211_FC(WLAN_FC_TYPE_MGMT,
711 (send_deauth ? WLAN_FC_STYPE_DEAUTH :
712 (reassoc ? WLAN_FC_STYPE_REASSOC_RESP :
713 WLAN_FC_STYPE_ASSOC_RESP)));
714 memcpy(mgmt->da, mgmt->sa, ETH_ALEN);
715 memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
716 /* Addr3 = BSSID - already set */
718 send_len = IEEE80211_HDRLEN;
720 send_len += sizeof(mgmt->u.deauth);
721 mgmt->u.deauth.reason_code = host_to_le16(resp);
724 send_len += sizeof(mgmt->u.assoc_resp);
725 mgmt->u.assoc_resp.capab_info =
726 host_to_le16(hostapd_own_capab_info(hapd));
727 mgmt->u.assoc_resp.status_code = host_to_le16(resp);
728 mgmt->u.assoc_resp.aid = host_to_le16((sta ? sta->aid : 0)
729 | BIT(14) | BIT(15));
730 /* Supported rates */
731 p = hostapd_eid_supp_rates(hapd, mgmt->u.assoc_resp.variable);
732 send_len += p - mgmt->u.assoc_resp.variable;
734 /* Request TX callback */
735 mgmt->frame_control |= host_to_le16(BIT(1));
738 if (hostapd_send_mgmt_frame(hapd, mgmt, send_len, 0) < 0)
739 perror("handle_assoc: send");
743 static void handle_assoc_resp(hostapd *hapd, struct ieee80211_mgmt *mgmt,
746 u16 status_code, aid;
748 if (hapd->assoc_ap_state != ASSOCIATE) {
749 printf("Unexpected association response received from " MACSTR
750 "\n", MAC2STR(mgmt->sa));
754 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.assoc_resp)) {
755 printf("handle_assoc_resp - too short payload (len=%lu)\n",
756 (unsigned long) len);
760 if (memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) != 0 ||
761 memcmp(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN) != 0) {
762 printf("Received association response from unexpected address "
763 "(SA=" MACSTR " BSSID=" MACSTR "\n",
764 MAC2STR(mgmt->sa), MAC2STR(mgmt->bssid));
768 status_code = le_to_host16(mgmt->u.assoc_resp.status_code);
769 aid = le_to_host16(mgmt->u.assoc_resp.aid);
770 aid &= ~(BIT(14) | BIT(15));
772 if (status_code != 0) {
773 printf("Association (as station) with AP " MACSTR " failed "
774 "(status_code=%d)\n",
775 MAC2STR(hapd->conf->assoc_ap_addr), status_code);
776 /* Try to authenticate again */
777 hapd->assoc_ap_state = AUTHENTICATE;
778 eloop_register_timeout(5, 0, ieee802_11_sta_authenticate,
782 printf("Associated (as station) with AP " MACSTR " (aid=%d)\n",
783 MAC2STR(hapd->conf->assoc_ap_addr), aid);
784 hapd->assoc_ap_aid = aid;
785 hapd->assoc_ap_state = ASSOCIATED;
787 if (hostapd_set_assoc_ap(hapd, hapd->conf->assoc_ap_addr)) {
788 printf("Could not set associated AP address to kernel "
794 static void handle_disassoc(hostapd *hapd, struct ieee80211_mgmt *mgmt,
797 struct sta_info *sta;
799 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.disassoc)) {
800 printf("handle_disassoc - too short payload (len=%lu)\n",
801 (unsigned long) len);
805 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
806 "disassocation: STA=" MACSTR " reason_code=%d\n",
808 le_to_host16(mgmt->u.disassoc.reason_code));
810 if (hapd->assoc_ap_state != DO_NOT_ASSOC &&
811 memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
812 printf("Assoc AP " MACSTR " sent disassociation "
813 "(reason_code=%d) - try to authenticate\n",
814 MAC2STR(hapd->conf->assoc_ap_addr),
815 le_to_host16(mgmt->u.disassoc.reason_code));
816 hapd->assoc_ap_state = AUTHENTICATE;
817 ieee802_11_sta_authenticate(hapd, NULL);
818 eloop_register_timeout(0, 500000, ieee802_11_sta_authenticate,
823 sta = ap_get_sta(hapd, mgmt->sa);
825 printf("Station " MACSTR " trying to disassociate, but it "
826 "is not associated.\n", MAC2STR(mgmt->sa));
830 sta->flags &= ~WLAN_STA_ASSOC;
831 wpa_sm_event(hapd, sta, WPA_DISASSOC);
832 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
833 HOSTAPD_LEVEL_INFO, "disassociated");
834 sta->acct_terminate_cause = RADIUS_ACCT_TERMINATE_CAUSE_USER_REQUEST;
835 ieee802_1x_set_port_enabled(hapd, sta, 0);
836 /* Stop Accounting and IEEE 802.1X sessions, but leave the STA
838 accounting_sta_stop(hapd, sta);
839 ieee802_1x_free_station(sta);
840 hostapd_sta_remove(hapd, sta->addr);
842 if (sta->timeout_next == STA_NULLFUNC ||
843 sta->timeout_next == STA_DISASSOC) {
844 sta->timeout_next = STA_DEAUTH;
845 eloop_cancel_timeout(ap_handle_timer, hapd, sta);
846 eloop_register_timeout(AP_DEAUTH_DELAY, 0, ap_handle_timer,
852 static void handle_deauth(hostapd *hapd, struct ieee80211_mgmt *mgmt,
855 struct sta_info *sta;
857 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.deauth)) {
858 printf("handle_deauth - too short payload (len=%lu)\n",
859 (unsigned long) len);
863 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
864 "deauthentication: STA=" MACSTR " reason_code=%d\n",
866 le_to_host16(mgmt->u.deauth.reason_code));
868 if (hapd->assoc_ap_state != DO_NOT_ASSOC &&
869 memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
870 printf("Assoc AP " MACSTR " sent deauthentication "
871 "(reason_code=%d) - try to authenticate\n",
872 MAC2STR(hapd->conf->assoc_ap_addr),
873 le_to_host16(mgmt->u.deauth.reason_code));
874 hapd->assoc_ap_state = AUTHENTICATE;
875 eloop_register_timeout(0, 500000, ieee802_11_sta_authenticate,
880 sta = ap_get_sta(hapd, mgmt->sa);
882 printf("Station " MACSTR " trying to deauthenticate, but it "
883 "is not authenticated.\n", MAC2STR(mgmt->sa));
887 sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC);
888 wpa_sm_event(hapd, sta, WPA_DEAUTH);
889 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
890 HOSTAPD_LEVEL_DEBUG, "deauthenticated");
891 sta->acct_terminate_cause = RADIUS_ACCT_TERMINATE_CAUSE_USER_REQUEST;
892 ieee802_1x_set_port_enabled(hapd, sta, 0);
893 ap_free_sta(hapd, sta);
897 static void handle_beacon(hostapd *hapd, struct ieee80211_mgmt *mgmt,
900 struct ieee802_11_elems elems;
902 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.beacon)) {
903 printf("handle_beacon - too short payload (len=%lu)\n",
904 (unsigned long) len);
908 (void) ieee802_11_parse_elems(hapd, mgmt->u.beacon.variable,
909 len - (IEEE80211_HDRLEN +
910 sizeof(mgmt->u.beacon)), &elems,
913 if (hapd->assoc_ap_state == WAIT_BEACON &&
914 memcmp(mgmt->sa, hapd->conf->assoc_ap_addr, ETH_ALEN) == 0) {
915 if (elems.ssid && elems.ssid_len <= 32) {
916 memcpy(hapd->assoc_ap_ssid, elems.ssid,
918 hapd->assoc_ap_ssid[elems.ssid_len] = '\0';
919 hapd->assoc_ap_ssid_len = elems.ssid_len;
921 ieee802_11_sta_authenticate(hapd, NULL);
924 if (!HOSTAPD_DEBUG_COND(HOSTAPD_DEBUG_EXCESSIVE))
927 printf("Beacon from " MACSTR, MAC2STR(mgmt->sa));
930 ieee802_11_print_ssid(elems.ssid, elems.ssid_len);
933 if (elems.ds_params && elems.ds_params_len == 1)
934 printf(" CHAN=%d", elems.ds_params[0]);
939 void ieee802_11_mgmt(struct hostapd_data *hapd, u8 *buf, size_t len, u16 stype)
941 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) buf;
943 if (stype == WLAN_FC_STYPE_BEACON) {
944 HOSTAPD_DEBUG(HOSTAPD_DEBUG_EXCESSIVE, "mgmt::beacon\n");
945 handle_beacon(hapd, mgmt, len);
949 if (memcmp(mgmt->bssid, hapd->own_addr, ETH_ALEN) != 0 &&
950 (hapd->assoc_ap_state == DO_NOT_ASSOC ||
951 memcmp(mgmt->bssid, hapd->conf->assoc_ap_addr, ETH_ALEN) != 0)) {
952 printf("MGMT: BSSID=" MACSTR " not our address\n",
953 MAC2STR(mgmt->bssid));
958 if (stype == WLAN_FC_STYPE_PROBE_REQ) {
959 printf("mgmt::probe_req\n");
963 if (memcmp(mgmt->da, hapd->own_addr, ETH_ALEN) != 0) {
964 printf("MGMT: DA=" MACSTR " not our address\n",
970 case WLAN_FC_STYPE_AUTH:
971 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::auth\n");
972 handle_auth(hapd, mgmt, len);
974 case WLAN_FC_STYPE_ASSOC_REQ:
975 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::assoc_req\n");
976 handle_assoc(hapd, mgmt, len, 0);
978 case WLAN_FC_STYPE_ASSOC_RESP:
979 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::assoc_resp\n");
980 handle_assoc_resp(hapd, mgmt, len);
982 case WLAN_FC_STYPE_REASSOC_REQ:
983 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::reassoc_req\n");
984 handle_assoc(hapd, mgmt, len, 1);
986 case WLAN_FC_STYPE_DISASSOC:
987 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::disassoc\n");
988 handle_disassoc(hapd, mgmt, len);
990 case WLAN_FC_STYPE_DEAUTH:
991 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::deauth\n");
992 handle_deauth(hapd, mgmt, len);
995 printf("unknown mgmt frame subtype %d\n", stype);
1001 static void handle_auth_cb(hostapd *hapd, struct ieee80211_mgmt *mgmt,
1004 u16 auth_alg, auth_transaction, status_code;
1005 struct sta_info *sta;
1008 hostapd_logger(hapd, mgmt->da, HOSTAPD_MODULE_IEEE80211,
1009 HOSTAPD_LEVEL_NOTICE,
1010 "did not acknowledge authentication response");
1014 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.auth)) {
1015 printf("handle_auth_cb - too short payload (len=%lu)\n",
1016 (unsigned long) len);
1020 auth_alg = le_to_host16(mgmt->u.auth.auth_alg);
1021 auth_transaction = le_to_host16(mgmt->u.auth.auth_transaction);
1022 status_code = le_to_host16(mgmt->u.auth.status_code);
1024 sta = ap_get_sta(hapd, mgmt->da);
1026 printf("handle_auth_cb: STA " MACSTR " not found\n",
1031 if (status_code == WLAN_STATUS_SUCCESS &&
1032 ((auth_alg == WLAN_AUTH_OPEN && auth_transaction == 2) ||
1033 (auth_alg == WLAN_AUTH_SHARED_KEY && auth_transaction == 4))) {
1034 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
1035 HOSTAPD_LEVEL_INFO, "authenticated");
1036 sta->flags |= WLAN_STA_AUTH;
1041 static void handle_assoc_cb(hostapd *hapd, struct ieee80211_mgmt *mgmt,
1042 size_t len, int reassoc, int ok)
1045 struct sta_info *sta;
1049 hostapd_logger(hapd, mgmt->da, HOSTAPD_MODULE_IEEE80211,
1050 HOSTAPD_LEVEL_DEBUG,
1051 "did not acknowledge association response");
1055 if (len < IEEE80211_HDRLEN + (reassoc ? sizeof(mgmt->u.reassoc_req) :
1056 sizeof(mgmt->u.assoc_req))) {
1057 printf("handle_assoc_cb(reassoc=%d) - too short payload "
1058 "(len=%lu)\n", reassoc, (unsigned long) len);
1063 status = le_to_host16(mgmt->u.reassoc_resp.status_code);
1065 status = le_to_host16(mgmt->u.assoc_resp.status_code);
1067 sta = ap_get_sta(hapd, mgmt->da);
1069 printf("handle_assoc_cb: STA " MACSTR " not found\n",
1074 if (status != WLAN_STATUS_SUCCESS)
1077 /* Stop previous accounting session, if one is started, and allocate
1078 * new session id for the new session. */
1079 accounting_sta_stop(hapd, sta);
1080 accounting_sta_get_id(hapd, sta);
1082 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
1084 "associated (aid %d, accounting session %08X-%08X)",
1085 sta->aid, sta->acct_session_id_hi,
1086 sta->acct_session_id_lo);
1088 if (sta->flags & WLAN_STA_ASSOC)
1090 sta->flags |= WLAN_STA_ASSOC;
1092 if (hostapd_sta_add(hapd, sta->addr, sta->aid, sta->capability,
1093 sta->tx_supp_rates)) {
1094 printf("Could not add station to kernel driver.\n");
1097 wpa_sm_event(hapd, sta, WPA_ASSOC);
1098 hostapd_new_assoc_sta(hapd, sta, !new_assoc);
1100 ieee802_1x_notify_port_enabled(sta->eapol_sm, 1);
1103 /* Copy of the association request is not needed anymore */
1104 if (sta->last_assoc_req) {
1105 free(sta->last_assoc_req);
1106 sta->last_assoc_req = NULL;
1111 void ieee802_11_mgmt_cb(struct hostapd_data *hapd, u8 *buf, size_t len,
1114 struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) buf;
1117 case WLAN_FC_STYPE_AUTH:
1118 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL, "mgmt::auth cb\n");
1119 handle_auth_cb(hapd, mgmt, len, ok);
1121 case WLAN_FC_STYPE_ASSOC_RESP:
1122 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
1123 "mgmt::assoc_resp cb\n");
1124 handle_assoc_cb(hapd, mgmt, len, 0, ok);
1126 case WLAN_FC_STYPE_REASSOC_RESP:
1127 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
1128 "mgmt::reassoc_resp cb\n");
1129 handle_assoc_cb(hapd, mgmt, len, 1, ok);
1132 printf("unknown mgmt cb frame subtype %d\n", stype);
1138 static void ieee80211_tkip_countermeasures_stop(void *eloop_ctx,
1141 struct hostapd_data *hapd = eloop_ctx;
1142 hapd->tkip_countermeasures = 0;
1143 hostapd_set_countermeasures(hapd, 0);
1144 hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
1145 HOSTAPD_LEVEL_INFO, "TKIP countermeasures ended");
1149 static void ieee80211_tkip_countermeasures_start(struct hostapd_data *hapd)
1151 struct sta_info *sta;
1153 hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
1154 HOSTAPD_LEVEL_INFO, "TKIP countermeasures initiated");
1157 hapd->wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
1158 hapd->tkip_countermeasures = 1;
1159 hostapd_set_countermeasures(hapd, 1);
1160 wpa_gtk_rekey(hapd);
1161 eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
1162 eloop_register_timeout(60, 0, ieee80211_tkip_countermeasures_stop,
1164 for (sta = hapd->sta_list; sta != NULL; sta = sta->next) {
1165 hostapd_sta_deauth(hapd, sta->addr,
1166 WLAN_REASON_MICHAEL_MIC_FAILURE);
1167 sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC |
1168 WLAN_STA_AUTHORIZED);
1169 hostapd_sta_remove(hapd, sta->addr);
1174 void ieee80211_michael_mic_failure(struct hostapd_data *hapd, u8 *addr,
1179 if (addr && local) {
1180 struct sta_info *sta = ap_get_sta(hapd, addr);
1182 sta->dot11RSNAStatsTKIPLocalMICFailures++;
1183 hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
1185 "Michael MIC failure detected in "
1188 HOSTAPD_DEBUG(HOSTAPD_DEBUG_MINIMAL,
1189 "MLME-MICHAELMICFAILURE.indication "
1190 "for not associated STA (" MACSTR
1191 ") ignored\n", MAC2STR(addr));
1197 if (now > hapd->michael_mic_failure + 60) {
1198 hapd->michael_mic_failures = 1;
1200 hapd->michael_mic_failures++;
1201 if (hapd->michael_mic_failures > 1)
1202 ieee80211_tkip_countermeasures_start(hapd);
1204 hapd->michael_mic_failure = now;
1208 int ieee802_11_get_mib(struct hostapd_data *hapd, char *buf, size_t buflen)
1215 int ieee802_11_get_mib_sta(struct hostapd_data *hapd, struct sta_info *sta,
1216 char *buf, size_t buflen)