3 * Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
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.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
18 #include "common/ieee802_11_defs.h"
19 #include "common/ieee802_11_common.h"
20 #include "eapol_supp/eapol_supp_sm.h"
21 #include "common/wpa_common.h"
22 #include "rsn_supp/wpa.h"
23 #include "rsn_supp/pmksa_cache.h"
25 #include "wpa_supplicant_i.h"
27 #include "wpas_glue.h"
28 #include "wps_supplicant.h"
30 #include "blacklist.h"
35 void sme_authenticate(struct wpa_supplicant *wpa_s,
36 struct wpa_bss *bss, struct wpa_ssid *ssid)
38 struct wpa_driver_auth_params params;
39 struct wpa_ssid *old_ssid;
40 #ifdef CONFIG_IEEE80211R
42 #endif /* CONFIG_IEEE80211R */
43 #ifdef CONFIG_IEEE80211R
45 #endif /* CONFIG_IEEE80211R */
49 wpa_printf(MSG_ERROR, "SME: No scan result available for the "
54 wpa_s->current_bss = bss;
56 os_memset(¶ms, 0, sizeof(params));
57 wpa_s->reassociate = 0;
59 params.freq = bss->freq;
60 params.bssid = bss->bssid;
61 params.ssid = bss->ssid;
62 params.ssid_len = bss->ssid_len;
64 if (wpa_s->sme.ssid_len != params.ssid_len ||
65 os_memcmp(wpa_s->sme.ssid, params.ssid, params.ssid_len) != 0)
66 wpa_s->sme.prev_bssid_set = 0;
68 wpa_s->sme.freq = params.freq;
69 os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
70 wpa_s->sme.ssid_len = params.ssid_len;
72 params.auth_alg = WPA_AUTH_ALG_OPEN;
73 #ifdef IEEE8021X_EAPOL
74 if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
76 if (ssid->non_leap == 0)
77 params.auth_alg = WPA_AUTH_ALG_LEAP;
79 params.auth_alg |= WPA_AUTH_ALG_LEAP;
82 #endif /* IEEE8021X_EAPOL */
83 wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
86 params.auth_alg = ssid->auth_alg;
87 wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
91 for (i = 0; i < NUM_WEP_KEYS; i++) {
92 if (ssid->wep_key_len[i])
93 params.wep_key[i] = ssid->wep_key[i];
94 params.wep_key_len[i] = ssid->wep_key_len[i];
96 params.wep_tx_keyidx = ssid->wep_tx_keyidx;
98 bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
99 os_memset(wpa_s->bssid, 0, ETH_ALEN);
100 os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
102 wpas_notify_bssid_changed(wpa_s);
104 if ((wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
105 wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
106 (ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
107 WPA_KEY_MGMT_FT_IEEE8021X |
108 WPA_KEY_MGMT_FT_PSK |
109 WPA_KEY_MGMT_IEEE8021X_SHA256 |
110 WPA_KEY_MGMT_PSK_SHA256))) {
111 int try_opportunistic;
112 try_opportunistic = ssid->proactive_key_caching &&
113 (ssid->proto & WPA_PROTO_RSN);
114 if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
116 try_opportunistic) == 0)
117 eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
118 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
119 if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
120 wpa_s->sme.assoc_req_ie,
121 &wpa_s->sme.assoc_req_ie_len)) {
122 wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
123 "management and encryption suites");
126 } else if (ssid->key_mgmt &
127 (WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
128 WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
129 WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
130 WPA_KEY_MGMT_IEEE8021X_SHA256)) {
131 wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
132 if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
133 wpa_s->sme.assoc_req_ie,
134 &wpa_s->sme.assoc_req_ie_len)) {
135 wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
136 "management and encryption suites (no scan "
141 } else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
142 struct wpabuf *wps_ie;
143 wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
144 if (wps_ie && wpabuf_len(wps_ie) <=
145 sizeof(wpa_s->sme.assoc_req_ie)) {
146 wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
147 os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
148 wpa_s->sme.assoc_req_ie_len);
150 wpa_s->sme.assoc_req_ie_len = 0;
152 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
153 #endif /* CONFIG_WPS */
155 wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
156 wpa_s->sme.assoc_req_ie_len = 0;
159 #ifdef CONFIG_IEEE80211R
160 ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
161 if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
163 wpa_sm_set_ft_params(wpa_s->wpa, md, NULL, 0, NULL);
165 /* Prepare for the next transition */
166 wpa_ft_prepare_auth_request(wpa_s->wpa, ie);
169 if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
170 WPA_KEY_MGMT_FT_IEEE8021X)) {
171 if (wpa_s->sme.assoc_req_ie_len + 5 <
172 sizeof(wpa_s->sme.assoc_req_ie)) {
173 struct rsn_mdie *mdie;
174 u8 *pos = wpa_s->sme.assoc_req_ie +
175 wpa_s->sme.assoc_req_ie_len;
176 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
177 *pos++ = sizeof(*mdie);
178 mdie = (struct rsn_mdie *) pos;
179 os_memcpy(mdie->mobility_domain, md,
180 MOBILITY_DOMAIN_ID_LEN);
181 mdie->ft_capab = md[MOBILITY_DOMAIN_ID_LEN];
182 wpa_s->sme.assoc_req_ie_len += 5;
185 if (wpa_s->sme.ft_used &&
186 os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0) {
187 wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
189 params.auth_alg = WPA_AUTH_ALG_FT;
190 params.ie = wpa_s->sme.ft_ies;
191 params.ie_len = wpa_s->sme.ft_ies_len;
194 #endif /* CONFIG_IEEE80211R */
196 #ifdef CONFIG_IEEE80211W
197 wpa_s->sme.mfp = ssid->ieee80211w;
198 if (ssid->ieee80211w != NO_MGMT_FRAME_PROTECTION) {
199 const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
200 struct wpa_ie_data _ie;
201 if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
203 (WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
204 wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
206 wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
209 #endif /* CONFIG_IEEE80211W */
211 wpa_supplicant_cancel_scan(wpa_s);
213 wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
214 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
215 wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
217 wpa_clear_keys(wpa_s, bss->bssid);
218 wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
219 old_ssid = wpa_s->current_ssid;
220 wpa_s->current_ssid = ssid;
221 wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
222 wpa_supplicant_initiate_eapol(wpa_s);
223 if (old_ssid != wpa_s->current_ssid)
224 wpas_notify_network_changed(wpa_s);
226 wpa_s->sme.auth_alg = params.auth_alg;
227 if (wpa_drv_authenticate(wpa_s, ¶ms) < 0) {
228 wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
233 /* TODO: add timeout on authentication */
236 * Association will be started based on the authentication event from
242 void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
244 struct wpa_ssid *ssid = wpa_s->current_ssid;
247 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
248 "network is not selected");
252 if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
253 wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
254 "not in authenticating state");
258 if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
259 wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
260 "unexpected peer " MACSTR,
261 MAC2STR(data->auth.peer));
265 wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
266 " auth_type=%d status_code=%d",
267 MAC2STR(data->auth.peer), data->auth.auth_type,
268 data->auth.status_code);
269 wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
270 data->auth.ies, data->auth.ies_len);
272 if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
273 wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
274 "code %d)", data->auth.status_code);
278 #ifdef CONFIG_IEEE80211R
279 if (data->auth.auth_type == WLAN_AUTH_FT) {
280 union wpa_event_data edata;
281 os_memset(&edata, 0, sizeof(edata));
282 edata.ft_ies.ies = data->auth.ies;
283 edata.ft_ies.ies_len = data->auth.ies_len;
284 os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
285 wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
287 #endif /* CONFIG_IEEE80211R */
289 sme_associate(wpa_s, ssid->mode, data->auth.peer,
290 data->auth.auth_type);
294 void sme_associate(struct wpa_supplicant *wpa_s, enum wpas_mode mode,
295 const u8 *bssid, u16 auth_type)
297 struct wpa_driver_associate_params params;
298 struct ieee802_11_elems elems;
300 os_memset(¶ms, 0, sizeof(params));
301 params.bssid = bssid;
302 params.ssid = wpa_s->sme.ssid;
303 params.ssid_len = wpa_s->sme.ssid_len;
304 params.freq = wpa_s->sme.freq;
305 params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
306 wpa_s->sme.assoc_req_ie : NULL;
307 params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
308 #ifdef CONFIG_IEEE80211R
309 if (auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
310 params.wpa_ie = wpa_s->sme.ft_ies;
311 params.wpa_ie_len = wpa_s->sme.ft_ies_len;
313 #endif /* CONFIG_IEEE80211R */
315 params.mgmt_frame_protection = wpa_s->sme.mfp;
316 if (wpa_s->sme.prev_bssid_set)
317 params.prev_bssid = wpa_s->sme.prev_bssid;
319 wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
320 " (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
321 params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
324 wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
326 if (ieee802_11_parse_elems(params.wpa_ie, params.wpa_ie_len, &elems, 0)
328 wpa_printf(MSG_DEBUG, "SME: Could not parse own IEs?!");
329 os_memset(&elems, 0, sizeof(elems));
332 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.rsn_ie - 2,
333 elems.rsn_ie_len + 2);
334 else if (elems.wpa_ie)
335 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.wpa_ie - 2,
336 elems.wpa_ie_len + 2);
338 wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
340 if (wpa_drv_associate(wpa_s, ¶ms) < 0) {
341 wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
343 wpa_supplicant_req_scan(wpa_s, 5, 0);
347 /* TODO: add timeout on association */
351 int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
352 const u8 *ies, size_t ies_len)
354 if (md == NULL || ies == NULL) {
355 wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
356 os_free(wpa_s->sme.ft_ies);
357 wpa_s->sme.ft_ies = NULL;
358 wpa_s->sme.ft_ies_len = 0;
359 wpa_s->sme.ft_used = 0;
363 os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
364 wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
365 os_free(wpa_s->sme.ft_ies);
366 wpa_s->sme.ft_ies = os_malloc(ies_len);
367 if (wpa_s->sme.ft_ies == NULL)
369 os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
370 wpa_s->sme.ft_ies_len = ies_len;
375 void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
376 union wpa_event_data *data)
381 wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
382 "status code %d", MAC2STR(wpa_s->pending_bssid),
383 data->assoc_reject.status_code);
385 bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
388 * For now, unconditionally terminate the previous authentication. In
389 * theory, this should not be needed, but mac80211 gets quite confused
390 * if the authentication is left pending.. Some roaming cases might
391 * benefit from using the previous authentication, so this could be
392 * optimized in the future.
394 if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
395 WLAN_REASON_DEAUTH_LEAVING) < 0) {
396 wpa_msg(wpa_s, MSG_INFO,
397 "Deauth request to the driver failed");
399 wpa_s->sme.prev_bssid_set = 0;
401 if (wpa_blacklist_add(wpa_s, wpa_s->pending_bssid) == 0) {
402 struct wpa_blacklist *b;
403 b = wpa_blacklist_get(wpa_s, wpa_s->pending_bssid);
404 if (b && b->count < 3) {
406 * Speed up next attempt if there could be other APs
407 * that could accept association.
412 wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
413 os_memset(wpa_s->bssid, 0, ETH_ALEN);
414 os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
416 wpas_notify_bssid_changed(wpa_s);
419 * TODO: if more than one possible AP is available in scan results,
420 * could try the other ones before requesting a new scan.
422 wpa_supplicant_req_scan(wpa_s, timeout / 1000,
423 1000 * (timeout % 1000));
427 void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
428 union wpa_event_data *data)
430 wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
431 wpa_supplicant_req_scan(wpa_s, 5, 0);
435 void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
436 union wpa_event_data *data)
438 wpa_printf(MSG_DEBUG, "SME: Association timed out");
439 wpa_supplicant_mark_disassoc(wpa_s);
440 wpa_supplicant_req_scan(wpa_s, 5, 0);
444 void sme_event_disassoc(struct wpa_supplicant *wpa_s,
445 union wpa_event_data *data)
447 wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
448 if (!is_zero_ether_addr(wpa_s->bssid) &&
449 !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
451 * cfg80211/mac80211 can get into somewhat confused state if
452 * the AP only disassociates us and leaves us in authenticated
453 * state. For now, force the state to be cleared to avoid
454 * confusing errors if we try to associate with the AP again.
456 wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
458 wpa_drv_deauthenticate(wpa_s, wpa_s->bssid,
459 WLAN_REASON_DEAUTH_LEAVING);