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b5b969e9 JM |
1 | /* |
2 | * hostapd / Callback functions for driver wrappers | |
3 | * Copyright (c) 2002-2009, 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 | ||
4dbfe5c5 | 17 | #include "common.h" |
b5b969e9 JM |
18 | #include "hostapd.h" |
19 | #include "driver_i.h" | |
20 | #include "ieee802_11.h" | |
21 | #include "radius/radius.h" | |
22 | #include "sta_info.h" | |
23 | #include "accounting.h" | |
24 | #include "tkip_countermeasures.h" | |
25 | #include "ieee802_1x.h" | |
26 | #include "wpa.h" | |
27 | #include "iapp.h" | |
28 | #include "wme.h" | |
3fed6f25 | 29 | #include "wps_hostapd.h" |
b5b969e9 JM |
30 | |
31 | ||
32 | struct prune_data { | |
33 | struct hostapd_data *hapd; | |
34 | const u8 *addr; | |
35 | }; | |
36 | ||
37 | static int prune_associations(struct hostapd_iface *iface, void *ctx) | |
38 | { | |
39 | struct prune_data *data = ctx; | |
40 | struct sta_info *osta; | |
41 | struct hostapd_data *ohapd; | |
42 | size_t j; | |
43 | ||
44 | for (j = 0; j < iface->num_bss; j++) { | |
45 | ohapd = iface->bss[j]; | |
46 | if (ohapd == data->hapd) | |
47 | continue; | |
48 | osta = ap_get_sta(ohapd, data->addr); | |
49 | if (!osta) | |
50 | continue; | |
51 | ||
52 | ap_sta_disassociate(ohapd, osta, WLAN_REASON_UNSPECIFIED); | |
53 | } | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | /** | |
59 | * hostapd_prune_associations - Remove extraneous associations | |
60 | * @hapd: Pointer to BSS data for the most recent association | |
61 | * @sta: Pointer to the associated STA data | |
62 | * | |
63 | * This function looks through all radios and BSS's for previous | |
64 | * (stale) associations of STA. If any are found they are removed. | |
65 | */ | |
66 | static void hostapd_prune_associations(struct hostapd_data *hapd, | |
67 | struct sta_info *sta) | |
68 | { | |
69 | struct prune_data data; | |
70 | data.hapd = hapd; | |
71 | data.addr = sta->addr; | |
72 | hostapd_for_each_interface(prune_associations, &data); | |
73 | } | |
74 | ||
75 | ||
76 | /** | |
77 | * hostapd_new_assoc_sta - Notify that a new station associated with the AP | |
78 | * @hapd: Pointer to BSS data | |
79 | * @sta: Pointer to the associated STA data | |
80 | * @reassoc: 1 to indicate this was a re-association; 0 = first association | |
81 | * | |
82 | * This function will be called whenever a station associates with the AP. It | |
83 | * can be called from ieee802_11.c for drivers that export MLME to hostapd and | |
84 | * from driver_*.c for drivers that take care of management frames (IEEE 802.11 | |
85 | * authentication and association) internally. | |
86 | */ | |
87 | void hostapd_new_assoc_sta(struct hostapd_data *hapd, struct sta_info *sta, | |
88 | int reassoc) | |
89 | { | |
90 | if (hapd->tkip_countermeasures) { | |
91 | hostapd_sta_deauth(hapd, sta->addr, | |
92 | WLAN_REASON_MICHAEL_MIC_FAILURE); | |
93 | return; | |
94 | } | |
95 | ||
96 | hostapd_prune_associations(hapd, sta); | |
97 | ||
98 | /* IEEE 802.11F (IAPP) */ | |
99 | if (hapd->conf->ieee802_11f) | |
100 | iapp_new_station(hapd->iapp, sta); | |
101 | ||
102 | /* Start accounting here, if IEEE 802.1X and WPA are not used. | |
103 | * IEEE 802.1X/WPA code will start accounting after the station has | |
104 | * been authorized. */ | |
105 | if (!hapd->conf->ieee802_1x && !hapd->conf->wpa) | |
106 | accounting_sta_start(hapd, sta); | |
107 | ||
b5b969e9 JM |
108 | /* Start IEEE 802.1X authentication process for new stations */ |
109 | ieee802_1x_new_station(hapd, sta); | |
110 | if (reassoc) { | |
111 | if (sta->auth_alg != WLAN_AUTH_FT && | |
112 | !(sta->flags & (WLAN_STA_WPS | WLAN_STA_MAYBE_WPS))) | |
113 | wpa_auth_sm_event(sta->wpa_sm, WPA_REAUTH); | |
114 | } else | |
115 | wpa_auth_sta_associated(hapd->wpa_auth, sta->wpa_sm); | |
116 | } | |
117 | ||
118 | ||
05310066 JM |
119 | int hostapd_notif_new_sta(struct hostapd_data *hapd, const u8 *addr) |
120 | { | |
121 | struct sta_info *sta = ap_get_sta(hapd, addr); | |
122 | if (sta) | |
123 | return 0; | |
124 | ||
125 | wpa_printf(MSG_DEBUG, "Data frame from unknown STA " MACSTR | |
126 | " - adding a new STA", MAC2STR(addr)); | |
127 | sta = ap_sta_add(hapd, addr); | |
128 | if (sta) { | |
129 | hostapd_new_assoc_sta(hapd, sta, 0); | |
130 | } else { | |
131 | wpa_printf(MSG_DEBUG, "Failed to add STA entry for " MACSTR, | |
132 | MAC2STR(addr)); | |
133 | return -1; | |
134 | } | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | ||
b5b969e9 JM |
140 | int hostapd_notif_assoc(struct hostapd_data *hapd, const u8 *addr, |
141 | const u8 *ie, size_t ielen) | |
142 | { | |
143 | struct sta_info *sta; | |
144 | int new_assoc, res; | |
145 | ||
146 | hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211, | |
147 | HOSTAPD_LEVEL_INFO, "associated"); | |
148 | ||
149 | sta = ap_get_sta(hapd, addr); | |
150 | if (sta) { | |
151 | accounting_sta_stop(hapd, sta); | |
152 | } else { | |
153 | sta = ap_sta_add(hapd, addr); | |
154 | if (sta == NULL) | |
155 | return -1; | |
156 | } | |
157 | sta->flags &= ~(WLAN_STA_WPS | WLAN_STA_MAYBE_WPS); | |
158 | ||
159 | if (hapd->conf->wpa) { | |
160 | if (ie == NULL || ielen == 0) { | |
161 | if (hapd->conf->wps_state) { | |
162 | wpa_printf(MSG_DEBUG, "STA did not include " | |
163 | "WPA/RSN IE in (Re)Association " | |
164 | "Request - possible WPS use"); | |
165 | sta->flags |= WLAN_STA_MAYBE_WPS; | |
166 | goto skip_wpa_check; | |
167 | } | |
168 | ||
169 | wpa_printf(MSG_DEBUG, "No WPA/RSN IE from STA"); | |
170 | return -1; | |
171 | } | |
172 | if (hapd->conf->wps_state && ie[0] == 0xdd && ie[1] >= 4 && | |
173 | os_memcmp(ie + 2, "\x00\x50\xf2\x04", 4) == 0) { | |
174 | sta->flags |= WLAN_STA_WPS; | |
175 | goto skip_wpa_check; | |
176 | } | |
177 | ||
178 | if (sta->wpa_sm == NULL) | |
179 | sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth, | |
180 | sta->addr); | |
181 | if (sta->wpa_sm == NULL) { | |
182 | wpa_printf(MSG_ERROR, "Failed to initialize WPA state " | |
183 | "machine"); | |
184 | return -1; | |
185 | } | |
186 | res = wpa_validate_wpa_ie(hapd->wpa_auth, sta->wpa_sm, | |
187 | ie, ielen, NULL, 0); | |
188 | if (res != WPA_IE_OK) { | |
355d36a7 | 189 | int resp; |
b5b969e9 JM |
190 | wpa_printf(MSG_DEBUG, "WPA/RSN information element " |
191 | "rejected? (res %u)", res); | |
192 | wpa_hexdump(MSG_DEBUG, "IE", ie, ielen); | |
355d36a7 AT |
193 | if (res == WPA_INVALID_GROUP) |
194 | resp = WLAN_REASON_GROUP_CIPHER_NOT_VALID; | |
195 | else if (res == WPA_INVALID_PAIRWISE) | |
196 | resp = WLAN_REASON_PAIRWISE_CIPHER_NOT_VALID; | |
197 | else if (res == WPA_INVALID_AKMP) | |
198 | resp = WLAN_REASON_AKMP_NOT_VALID; | |
199 | #ifdef CONFIG_IEEE80211W | |
200 | else if (res == WPA_MGMT_FRAME_PROTECTION_VIOLATION) | |
201 | resp = WLAN_REASON_INVALID_IE; | |
202 | else if (res == WPA_INVALID_MGMT_GROUP_CIPHER) | |
203 | resp = WLAN_REASON_GROUP_CIPHER_NOT_VALID; | |
204 | #endif /* CONFIG_IEEE80211W */ | |
205 | else | |
206 | resp = WLAN_REASON_INVALID_IE; | |
207 | hostapd_sta_disassoc(hapd, sta->addr, resp); | |
208 | ap_free_sta(hapd, sta); | |
b5b969e9 JM |
209 | return -1; |
210 | } | |
a9aca28b JM |
211 | } else if (hapd->conf->wps_state) { |
212 | if (ie && ielen > 4 && ie[0] == 0xdd && ie[1] >= 4 && | |
213 | os_memcmp(ie + 2, "\x00\x50\xf2\x04", 4) == 0) { | |
214 | sta->flags |= WLAN_STA_WPS; | |
215 | } else | |
216 | sta->flags |= WLAN_STA_MAYBE_WPS; | |
b5b969e9 JM |
217 | } |
218 | skip_wpa_check: | |
219 | ||
220 | new_assoc = (sta->flags & WLAN_STA_ASSOC) == 0; | |
221 | sta->flags |= WLAN_STA_AUTH | WLAN_STA_ASSOC; | |
222 | wpa_auth_sm_event(sta->wpa_sm, WPA_ASSOC); | |
223 | ||
224 | hostapd_new_assoc_sta(hapd, sta, !new_assoc); | |
225 | ||
226 | ieee802_1x_notify_port_enabled(sta->eapol_sm, 1); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | ||
232 | void hostapd_notif_disassoc(struct hostapd_data *hapd, const u8 *addr) | |
233 | { | |
234 | struct sta_info *sta; | |
235 | ||
236 | hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211, | |
237 | HOSTAPD_LEVEL_INFO, "disassociated"); | |
238 | ||
239 | sta = ap_get_sta(hapd, addr); | |
240 | if (sta == NULL) { | |
241 | wpa_printf(MSG_DEBUG, "Disassociation notification for " | |
242 | "unknown STA " MACSTR, MAC2STR(addr)); | |
243 | return; | |
244 | } | |
245 | ||
246 | sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC); | |
247 | wpa_auth_sm_event(sta->wpa_sm, WPA_DISASSOC); | |
248 | sta->acct_terminate_cause = RADIUS_ACCT_TERMINATE_CAUSE_USER_REQUEST; | |
249 | ieee802_1x_notify_port_enabled(sta->eapol_sm, 0); | |
250 | ap_free_sta(hapd, sta); | |
251 | } | |
252 | ||
253 | ||
254 | void hostapd_eapol_receive(struct hostapd_data *hapd, const u8 *sa, | |
255 | const u8 *buf, size_t len) | |
256 | { | |
257 | ieee802_1x_receive(hapd, sa, buf, len); | |
258 | } | |
259 | ||
260 | ||
f8b1f695 JM |
261 | struct hostapd_data * hostapd_sta_get_bss(struct hostapd_data *hapd, |
262 | const u8 *addr) | |
263 | { | |
264 | struct hostapd_iface *iface = hapd->iface; | |
265 | size_t j; | |
266 | ||
267 | for (j = 0; j < iface->num_bss; j++) { | |
268 | hapd = iface->bss[j]; | |
269 | if (ap_get_sta(hapd, addr)) | |
270 | return hapd; | |
271 | } | |
272 | ||
273 | return NULL; | |
274 | } | |
275 | ||
276 | ||
277 | #ifdef HOSTAPD | |
278 | ||
fe6bdb77 | 279 | #ifdef NEED_AP_MLME |
f8b1f695 JM |
280 | |
281 | static const u8 * get_hdr_bssid(const struct ieee80211_hdr *hdr, size_t len) | |
282 | { | |
283 | u16 fc, type, stype; | |
284 | ||
285 | /* | |
286 | * PS-Poll frames are 16 bytes. All other frames are | |
287 | * 24 bytes or longer. | |
288 | */ | |
289 | if (len < 16) | |
290 | return NULL; | |
291 | ||
292 | fc = le_to_host16(hdr->frame_control); | |
293 | type = WLAN_FC_GET_TYPE(fc); | |
294 | stype = WLAN_FC_GET_STYPE(fc); | |
295 | ||
296 | switch (type) { | |
297 | case WLAN_FC_TYPE_DATA: | |
298 | if (len < 24) | |
299 | return NULL; | |
300 | switch (fc & (WLAN_FC_FROMDS | WLAN_FC_TODS)) { | |
301 | case WLAN_FC_TODS: | |
302 | return hdr->addr1; | |
303 | case WLAN_FC_FROMDS: | |
304 | return hdr->addr2; | |
305 | default: | |
306 | return NULL; | |
307 | } | |
308 | case WLAN_FC_TYPE_CTRL: | |
309 | if (stype != WLAN_FC_STYPE_PSPOLL) | |
310 | return NULL; | |
311 | return hdr->addr1; | |
312 | case WLAN_FC_TYPE_MGMT: | |
313 | return hdr->addr3; | |
314 | default: | |
315 | return NULL; | |
316 | } | |
317 | } | |
318 | ||
319 | ||
320 | #define HAPD_BROADCAST ((struct hostapd_data *) -1) | |
321 | ||
322 | static struct hostapd_data * get_hapd_bssid(struct hostapd_iface *iface, | |
323 | const u8 *bssid) | |
324 | { | |
325 | size_t i; | |
326 | ||
327 | if (bssid == NULL) | |
328 | return NULL; | |
329 | if (bssid[0] == 0xff && bssid[1] == 0xff && bssid[2] == 0xff && | |
330 | bssid[3] == 0xff && bssid[4] == 0xff && bssid[5] == 0xff) | |
331 | return HAPD_BROADCAST; | |
332 | ||
333 | for (i = 0; i < iface->num_bss; i++) { | |
334 | if (os_memcmp(bssid, iface->bss[i]->own_addr, ETH_ALEN) == 0) | |
335 | return iface->bss[i]; | |
336 | } | |
337 | ||
338 | return NULL; | |
339 | } | |
340 | ||
341 | ||
342 | static void hostapd_rx_from_unknown_sta(struct hostapd_data *hapd, | |
343 | const struct ieee80211_hdr *hdr, | |
344 | size_t len) | |
345 | { | |
346 | hapd = get_hapd_bssid(hapd->iface, get_hdr_bssid(hdr, len)); | |
347 | if (hapd == NULL || hapd == HAPD_BROADCAST) | |
348 | return; | |
349 | ||
350 | ieee802_11_rx_from_unknown(hapd, hdr->addr2); | |
351 | } | |
352 | ||
353 | ||
354 | static void hostapd_mgmt_rx(struct hostapd_data *hapd, u8 *buf, | |
355 | size_t len, struct hostapd_frame_info *fi) | |
b5b969e9 | 356 | { |
4b9841d3 JM |
357 | struct hostapd_iface *iface = hapd->iface; |
358 | struct ieee80211_hdr *hdr; | |
359 | const u8 *bssid; | |
360 | ||
361 | hdr = (struct ieee80211_hdr *) buf; | |
362 | bssid = get_hdr_bssid(hdr, len); | |
363 | if (bssid == NULL) | |
364 | return; | |
365 | ||
366 | hapd = get_hapd_bssid(iface, bssid); | |
367 | if (hapd == NULL) { | |
368 | u16 fc; | |
369 | fc = le_to_host16(hdr->frame_control); | |
370 | ||
371 | /* | |
372 | * Drop frames to unknown BSSIDs except for Beacon frames which | |
373 | * could be used to update neighbor information. | |
374 | */ | |
375 | if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT && | |
376 | WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_BEACON) | |
377 | hapd = iface->bss[0]; | |
378 | else | |
379 | return; | |
380 | } | |
381 | ||
382 | if (hapd == HAPD_BROADCAST) { | |
383 | size_t i; | |
384 | for (i = 0; i < iface->num_bss; i++) | |
f8b1f695 | 385 | ieee802_11_mgmt(iface->bss[i], buf, len, fi); |
4b9841d3 | 386 | } else |
f8b1f695 | 387 | ieee802_11_mgmt(hapd, buf, len, fi); |
b5b969e9 JM |
388 | } |
389 | ||
390 | ||
f8b1f695 JM |
391 | static void hostapd_mgmt_tx_cb(struct hostapd_data *hapd, const u8 *buf, |
392 | size_t len, u16 stype, int ok) | |
b5b969e9 | 393 | { |
4b9841d3 JM |
394 | struct ieee80211_hdr *hdr; |
395 | hdr = (struct ieee80211_hdr *) buf; | |
396 | hapd = get_hapd_bssid(hapd->iface, get_hdr_bssid(hdr, len)); | |
397 | if (hapd == NULL || hapd == HAPD_BROADCAST) | |
398 | return; | |
b5b969e9 JM |
399 | ieee802_11_mgmt_cb(hapd, buf, len, stype, ok); |
400 | } | |
f82ef4d8 | 401 | |
f8b1f695 | 402 | #endif /* NEED_AP_MLME */ |
ad1e68e6 JM |
403 | |
404 | ||
ad1e68e6 JM |
405 | void wpa_supplicant_event(void *ctx, wpa_event_type event, |
406 | union wpa_event_data *data) | |
407 | { | |
408 | struct hostapd_data *hapd = ctx; | |
409 | ||
410 | switch (event) { | |
411 | case EVENT_MICHAEL_MIC_FAILURE: | |
412 | michael_mic_failure(hapd, data->michael_mic_failure.src, 1); | |
413 | break; | |
414 | case EVENT_SCAN_RESULTS: | |
415 | if (hapd->iface->scan_cb) | |
416 | hapd->iface->scan_cb(hapd->iface); | |
417 | break; | |
08fd8c15 | 418 | #ifdef CONFIG_IEEE80211R |
f2dab64e | 419 | case EVENT_FT_RRB_RX: |
08fd8c15 JM |
420 | wpa_ft_rrb_rx(hapd->wpa_auth, data->ft_rrb_rx.src, |
421 | data->ft_rrb_rx.data, data->ft_rrb_rx.data_len); | |
422 | break; | |
423 | #endif /* CONFIG_IEEE80211R */ | |
fcf0f87d JM |
424 | case EVENT_WPS_BUTTON_PUSHED: |
425 | hostapd_wps_button_pushed(hapd); | |
426 | break; | |
f8b1f695 JM |
427 | #ifdef NEED_AP_MLME |
428 | case EVENT_TX_STATUS: | |
429 | switch (data->tx_status.type) { | |
430 | case WLAN_FC_TYPE_MGMT: | |
431 | hostapd_mgmt_tx_cb(hapd, data->tx_status.data, | |
432 | data->tx_status.data_len, | |
433 | data->tx_status.stype, | |
434 | data->tx_status.ack); | |
435 | break; | |
436 | case WLAN_FC_TYPE_DATA: | |
437 | hostapd_tx_status(hapd, data->tx_status.dst, | |
438 | data->tx_status.data, | |
439 | data->tx_status.data_len, | |
440 | data->tx_status.ack); | |
441 | break; | |
442 | } | |
443 | break; | |
444 | case EVENT_RX_FROM_UNKNOWN: | |
445 | hostapd_rx_from_unknown_sta(hapd, data->rx_from_unknown.hdr, | |
446 | data->rx_from_unknown.len); | |
447 | break; | |
448 | case EVENT_RX_MGMT: | |
449 | hostapd_mgmt_rx(hapd, data->rx_mgmt.frame, | |
450 | data->rx_mgmt.frame_len, data->rx_mgmt.fi); | |
451 | break; | |
452 | #endif /* NEED_AP_MLME */ | |
ad1e68e6 JM |
453 | default: |
454 | wpa_printf(MSG_DEBUG, "Unknown event %d", event); | |
455 | break; | |
456 | } | |
457 | } | |
f8b1f695 JM |
458 | |
459 | #endif /* HOSTAPD */ | |
3fed6f25 JM |
460 | |
461 | ||
462 | void hostapd_probe_req_rx(struct hostapd_data *hapd, const u8 *sa, | |
463 | const u8 *ie, size_t ie_len) | |
464 | { | |
fa16028d JM |
465 | size_t i; |
466 | ||
467 | for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++) | |
468 | hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx, | |
469 | sa, ie, ie_len); | |
3fed6f25 | 470 | } |