Line data Source code
1 : /*
2 : * hostapd / IEEE 802.11 Management: Beacon and Probe Request/Response
3 : * Copyright (c) 2002-2004, Instant802 Networks, Inc.
4 : * Copyright (c) 2005-2006, Devicescape Software, Inc.
5 : * Copyright (c) 2008-2012, Jouni Malinen <j@w1.fi>
6 : *
7 : * This software may be distributed under the terms of the BSD license.
8 : * See README for more details.
9 : */
10 :
11 : #include "utils/includes.h"
12 :
13 : #ifndef CONFIG_NATIVE_WINDOWS
14 :
15 : #include "utils/common.h"
16 : #include "common/ieee802_11_defs.h"
17 : #include "common/ieee802_11_common.h"
18 : #include "wps/wps_defs.h"
19 : #include "p2p/p2p.h"
20 : #include "hostapd.h"
21 : #include "ieee802_11.h"
22 : #include "wpa_auth.h"
23 : #include "wmm.h"
24 : #include "ap_config.h"
25 : #include "sta_info.h"
26 : #include "p2p_hostapd.h"
27 : #include "ap_drv_ops.h"
28 : #include "beacon.h"
29 : #include "hs20.h"
30 : #include "dfs.h"
31 :
32 :
33 : #ifdef NEED_AP_MLME
34 :
35 3101 : static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
36 : {
37 : #ifdef CONFIG_TESTING_OPTIONS
38 3101 : if (hapd->conf->bss_load_test_set) {
39 11 : if (2 + 5 > len)
40 0 : return eid;
41 11 : *eid++ = WLAN_EID_BSS_LOAD;
42 11 : *eid++ = 5;
43 11 : os_memcpy(eid, hapd->conf->bss_load_test, 5);
44 11 : eid += 5;
45 : }
46 : #endif /* CONFIG_TESTING_OPTIONS */
47 3101 : return eid;
48 : }
49 :
50 :
51 4680 : static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
52 : {
53 4680 : u8 erp = 0;
54 :
55 9358 : if (hapd->iface->current_mode == NULL ||
56 4678 : hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
57 56 : return 0;
58 :
59 4624 : if (hapd->iface->olbc)
60 2 : erp |= ERP_INFO_USE_PROTECTION;
61 4624 : if (hapd->iface->num_sta_non_erp > 0) {
62 0 : erp |= ERP_INFO_NON_ERP_PRESENT |
63 : ERP_INFO_USE_PROTECTION;
64 : }
65 9248 : if (hapd->iface->num_sta_no_short_preamble > 0 ||
66 4624 : hapd->iconf->preamble == LONG_PREAMBLE)
67 4621 : erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
68 :
69 4624 : return erp;
70 : }
71 :
72 :
73 3101 : static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
74 : {
75 3101 : *eid++ = WLAN_EID_DS_PARAMS;
76 3101 : *eid++ = 1;
77 3101 : *eid++ = hapd->iconf->channel;
78 3101 : return eid;
79 : }
80 :
81 :
82 3101 : static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
83 : {
84 6200 : if (hapd->iface->current_mode == NULL ||
85 3099 : hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
86 75 : return eid;
87 :
88 : /* Set NonERP_present and use_protection bits if there
89 : * are any associated NonERP stations. */
90 : /* TODO: use_protection bit can be set to zero even if
91 : * there are NonERP stations present. This optimization
92 : * might be useful if NonERP stations are "quiet".
93 : * See 802.11g/D6 E-1 for recommended practice.
94 : * In addition, Non ERP present might be set, if AP detects Non ERP
95 : * operation on other APs. */
96 :
97 : /* Add ERP Information element */
98 3026 : *eid++ = WLAN_EID_ERP_INFO;
99 3026 : *eid++ = 1;
100 3026 : *eid++ = ieee802_11_erp_info(hapd);
101 :
102 3026 : return eid;
103 : }
104 :
105 :
106 3101 : static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
107 : {
108 3101 : u8 *pos = eid;
109 3101 : u8 local_pwr_constraint = 0;
110 : int dfs;
111 :
112 6200 : if (hapd->iface->current_mode == NULL ||
113 3099 : hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
114 3038 : return eid;
115 :
116 : /*
117 : * There is no DFS support and power constraint was not directly
118 : * requested by config option.
119 : */
120 126 : if (!hapd->iconf->ieee80211h &&
121 63 : hapd->iconf->local_pwr_constraint == -1)
122 61 : return eid;
123 :
124 : /* Check if DFS is required by regulatory. */
125 2 : dfs = hostapd_is_dfs_required(hapd->iface);
126 2 : if (dfs < 0) {
127 0 : wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d",
128 : dfs);
129 0 : dfs = 0;
130 : }
131 :
132 2 : if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1)
133 0 : return eid;
134 :
135 : /*
136 : * ieee80211h (DFS) is enabled so Power Constraint element shall
137 : * be added when running on DFS channel whenever local_pwr_constraint
138 : * is configured or not. In order to meet regulations when TPC is not
139 : * implemented using a transmit power that is below the legal maximum
140 : * (including any mitigation factor) should help. In this case,
141 : * indicate 3 dB below maximum allowed transmit power.
142 : */
143 2 : if (hapd->iconf->local_pwr_constraint == -1)
144 0 : local_pwr_constraint = 3;
145 :
146 : /*
147 : * A STA that is not an AP shall use a transmit power less than or
148 : * equal to the local maximum transmit power level for the channel.
149 : * The local maximum transmit power can be calculated from the formula:
150 : * local max TX pwr = max TX pwr - local pwr constraint
151 : * Where max TX pwr is maximum transmit power level specified for
152 : * channel in Country element and local pwr constraint is specified
153 : * for channel in this Power Constraint element.
154 : */
155 :
156 : /* Element ID */
157 2 : *pos++ = WLAN_EID_PWR_CONSTRAINT;
158 : /* Length */
159 2 : *pos++ = 1;
160 : /* Local Power Constraint */
161 2 : if (local_pwr_constraint)
162 0 : *pos++ = local_pwr_constraint;
163 : else
164 2 : *pos++ = hapd->iconf->local_pwr_constraint;
165 :
166 2 : return pos;
167 : }
168 :
169 :
170 4 : static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
171 : struct hostapd_channel_data *start,
172 : struct hostapd_channel_data *prev)
173 : {
174 4 : if (end - pos < 3)
175 0 : return pos;
176 :
177 : /* first channel number */
178 4 : *pos++ = start->chan;
179 : /* number of channels */
180 4 : *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
181 : /* maximum transmit power level */
182 4 : *pos++ = start->max_tx_power;
183 :
184 4 : return pos;
185 : }
186 :
187 :
188 3101 : static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
189 : int max_len)
190 : {
191 3101 : u8 *pos = eid;
192 3101 : u8 *end = eid + max_len;
193 : int i;
194 : struct hostapd_hw_modes *mode;
195 : struct hostapd_channel_data *start, *prev;
196 3101 : int chan_spacing = 1;
197 :
198 3105 : if (!hapd->iconf->ieee80211d || max_len < 6 ||
199 4 : hapd->iface->current_mode == NULL)
200 3097 : return eid;
201 :
202 4 : *pos++ = WLAN_EID_COUNTRY;
203 4 : pos++; /* length will be set later */
204 4 : os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
205 4 : pos += 3;
206 :
207 4 : mode = hapd->iface->current_mode;
208 4 : if (mode->mode == HOSTAPD_MODE_IEEE80211A)
209 4 : chan_spacing = 4;
210 :
211 4 : start = prev = NULL;
212 100 : for (i = 0; i < mode->num_channels; i++) {
213 96 : struct hostapd_channel_data *chan = &mode->channels[i];
214 96 : if (chan->flag & HOSTAPD_CHAN_DISABLED)
215 80 : continue;
216 28 : if (start && prev &&
217 24 : prev->chan + chan_spacing == chan->chan &&
218 12 : start->max_tx_power == chan->max_tx_power) {
219 12 : prev = chan;
220 12 : continue; /* can use same entry */
221 : }
222 :
223 4 : if (start) {
224 0 : pos = hostapd_eid_country_add(pos, end, chan_spacing,
225 : start, prev);
226 0 : start = NULL;
227 : }
228 :
229 : /* Start new group */
230 4 : start = prev = chan;
231 : }
232 :
233 4 : if (start) {
234 4 : pos = hostapd_eid_country_add(pos, end, chan_spacing,
235 : start, prev);
236 : }
237 :
238 4 : if ((pos - eid) & 1) {
239 0 : if (end - pos < 1)
240 0 : return eid;
241 0 : *pos++ = 0; /* pad for 16-bit alignment */
242 : }
243 :
244 4 : eid[1] = (pos - eid) - 2;
245 :
246 4 : return pos;
247 : }
248 :
249 :
250 3101 : static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
251 : {
252 : const u8 *ie;
253 : size_t ielen;
254 :
255 3101 : ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
256 3101 : if (ie == NULL || ielen > len)
257 704 : return eid;
258 :
259 2397 : os_memcpy(eid, ie, ielen);
260 2397 : return eid + ielen;
261 : }
262 :
263 :
264 3101 : static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
265 : {
266 : u8 chan;
267 :
268 3101 : if (!hapd->iface->cs_freq_params.freq)
269 3099 : return eid;
270 :
271 2 : if (ieee80211_freq_to_chan(hapd->iface->cs_freq_params.freq, &chan) ==
272 : NUM_HOSTAPD_MODES)
273 0 : return eid;
274 :
275 2 : *eid++ = WLAN_EID_CHANNEL_SWITCH;
276 2 : *eid++ = 3;
277 2 : *eid++ = hapd->iface->cs_block_tx;
278 2 : *eid++ = chan;
279 2 : *eid++ = hapd->iface->cs_count;
280 :
281 2 : return eid;
282 : }
283 :
284 :
285 2 : static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
286 : {
287 : u8 sec_ch;
288 :
289 2 : if (!hapd->iface->cs_freq_params.sec_channel_offset)
290 1 : return eid;
291 :
292 1 : if (hapd->iface->cs_freq_params.sec_channel_offset == -1)
293 0 : sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
294 1 : else if (hapd->iface->cs_freq_params.sec_channel_offset == 1)
295 0 : sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
296 : else
297 1 : return eid;
298 :
299 0 : *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
300 0 : *eid++ = 1;
301 0 : *eid++ = sec_ch;
302 :
303 0 : return eid;
304 : }
305 :
306 :
307 3101 : static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
308 : u8 *start, unsigned int *csa_counter_off)
309 : {
310 3101 : u8 *old_pos = pos;
311 :
312 3101 : if (!csa_counter_off)
313 0 : return pos;
314 :
315 3101 : *csa_counter_off = 0;
316 3101 : pos = hostapd_eid_csa(hapd, pos);
317 :
318 3101 : if (pos != old_pos) {
319 : /* save an offset to the counter - should be last byte */
320 2 : *csa_counter_off = pos - start - 1;
321 2 : pos = hostapd_eid_secondary_channel(hapd, pos);
322 : }
323 :
324 3101 : return pos;
325 : }
326 :
327 :
328 1447 : static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
329 : struct sta_info *sta,
330 : const struct ieee80211_mgmt *req,
331 : int is_p2p, size_t *resp_len)
332 : {
333 : struct ieee80211_mgmt *resp;
334 : u8 *pos, *epos;
335 : size_t buflen;
336 :
337 : #define MAX_PROBERESP_LEN 768
338 1447 : buflen = MAX_PROBERESP_LEN;
339 : #ifdef CONFIG_WPS
340 1447 : if (hapd->wps_probe_resp_ie)
341 444 : buflen += wpabuf_len(hapd->wps_probe_resp_ie);
342 : #endif /* CONFIG_WPS */
343 : #ifdef CONFIG_P2P
344 242 : if (hapd->p2p_probe_resp_ie)
345 225 : buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
346 : #endif /* CONFIG_P2P */
347 1447 : if (hapd->conf->vendor_elements)
348 1 : buflen += wpabuf_len(hapd->conf->vendor_elements);
349 1447 : resp = os_zalloc(buflen);
350 1447 : if (resp == NULL)
351 0 : return NULL;
352 :
353 1447 : epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
354 :
355 1447 : resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
356 : WLAN_FC_STYPE_PROBE_RESP);
357 1447 : if (req)
358 1447 : os_memcpy(resp->da, req->sa, ETH_ALEN);
359 1447 : os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
360 :
361 1447 : os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
362 1447 : resp->u.probe_resp.beacon_int =
363 1447 : host_to_le16(hapd->iconf->beacon_int);
364 :
365 : /* hardware or low-level driver will setup seq_ctrl and timestamp */
366 1447 : resp->u.probe_resp.capab_info =
367 1447 : host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
368 :
369 1447 : pos = resp->u.probe_resp.variable;
370 1447 : *pos++ = WLAN_EID_SSID;
371 1447 : *pos++ = hapd->conf->ssid.ssid_len;
372 1447 : os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
373 1447 : pos += hapd->conf->ssid.ssid_len;
374 :
375 : /* Supported rates */
376 1447 : pos = hostapd_eid_supp_rates(hapd, pos);
377 :
378 : /* DS Params */
379 1447 : pos = hostapd_eid_ds_params(hapd, pos);
380 :
381 1447 : pos = hostapd_eid_country(hapd, pos, epos - pos);
382 :
383 : /* Power Constraint element */
384 1447 : pos = hostapd_eid_pwr_constraint(hapd, pos);
385 :
386 : /* ERP Information element */
387 1447 : pos = hostapd_eid_erp_info(hapd, pos);
388 :
389 : /* Extended supported rates */
390 1447 : pos = hostapd_eid_ext_supp_rates(hapd, pos);
391 :
392 : /* RSN, MDIE, WPA */
393 1447 : pos = hostapd_eid_wpa(hapd, pos, epos - pos);
394 :
395 1447 : pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
396 :
397 : #ifdef CONFIG_IEEE80211N
398 1447 : pos = hostapd_eid_ht_capabilities(hapd, pos);
399 1447 : pos = hostapd_eid_ht_operation(hapd, pos);
400 : #endif /* CONFIG_IEEE80211N */
401 :
402 1447 : pos = hostapd_eid_ext_capab(hapd, pos);
403 :
404 1447 : pos = hostapd_eid_time_adv(hapd, pos);
405 1447 : pos = hostapd_eid_time_zone(hapd, pos);
406 :
407 1447 : pos = hostapd_eid_interworking(hapd, pos);
408 1447 : pos = hostapd_eid_adv_proto(hapd, pos);
409 1447 : pos = hostapd_eid_roaming_consortium(hapd, pos);
410 :
411 1447 : pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
412 1447 : &hapd->iface->cs_c_off_proberesp);
413 : #ifdef CONFIG_IEEE80211AC
414 1205 : pos = hostapd_eid_vht_capabilities(hapd, pos);
415 1205 : pos = hostapd_eid_vht_operation(hapd, pos);
416 : #endif /* CONFIG_IEEE80211AC */
417 :
418 : /* Wi-Fi Alliance WMM */
419 1447 : pos = hostapd_eid_wmm(hapd, pos);
420 :
421 : #ifdef CONFIG_WPS
422 1447 : if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
423 444 : os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
424 : wpabuf_len(hapd->wps_probe_resp_ie));
425 444 : pos += wpabuf_len(hapd->wps_probe_resp_ie);
426 : }
427 : #endif /* CONFIG_WPS */
428 :
429 : #ifdef CONFIG_P2P
430 459 : if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
431 217 : hapd->p2p_probe_resp_ie) {
432 217 : os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
433 : wpabuf_len(hapd->p2p_probe_resp_ie));
434 217 : pos += wpabuf_len(hapd->p2p_probe_resp_ie);
435 : }
436 : #endif /* CONFIG_P2P */
437 : #ifdef CONFIG_P2P_MANAGER
438 1205 : if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
439 : P2P_MANAGE)
440 6 : pos = hostapd_eid_p2p_manage(hapd, pos);
441 : #endif /* CONFIG_P2P_MANAGER */
442 :
443 : #ifdef CONFIG_HS20
444 1447 : pos = hostapd_eid_hs20_indication(hapd, pos);
445 1447 : pos = hostapd_eid_osen(hapd, pos);
446 : #endif /* CONFIG_HS20 */
447 :
448 1447 : if (hapd->conf->vendor_elements) {
449 1 : os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
450 : wpabuf_len(hapd->conf->vendor_elements));
451 1 : pos += wpabuf_len(hapd->conf->vendor_elements);
452 : }
453 :
454 1447 : *resp_len = pos - (u8 *) resp;
455 1447 : return (u8 *) resp;
456 : }
457 :
458 :
459 : enum ssid_match_result {
460 : NO_SSID_MATCH,
461 : EXACT_SSID_MATCH,
462 : WILDCARD_SSID_MATCH
463 : };
464 :
465 1542 : static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
466 : const u8 *ssid, size_t ssid_len,
467 : const u8 *ssid_list,
468 : size_t ssid_list_len)
469 : {
470 : const u8 *pos, *end;
471 1542 : int wildcard = 0;
472 :
473 1542 : if (ssid_len == 0)
474 1244 : wildcard = 1;
475 1773 : if (ssid_len == hapd->conf->ssid.ssid_len &&
476 231 : os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
477 218 : return EXACT_SSID_MATCH;
478 :
479 1324 : if (ssid_list == NULL)
480 1324 : return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
481 :
482 0 : pos = ssid_list;
483 0 : end = ssid_list + ssid_list_len;
484 0 : while (pos + 1 <= end) {
485 0 : if (pos + 2 + pos[1] > end)
486 0 : break;
487 0 : if (pos[1] == 0)
488 0 : wildcard = 1;
489 0 : if (pos[1] == hapd->conf->ssid.ssid_len &&
490 0 : os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
491 0 : return EXACT_SSID_MATCH;
492 0 : pos += 2 + pos[1];
493 : }
494 :
495 0 : return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
496 : }
497 :
498 :
499 1553 : void handle_probe_req(struct hostapd_data *hapd,
500 : const struct ieee80211_mgmt *mgmt, size_t len,
501 : int ssi_signal)
502 : {
503 : u8 *resp;
504 : struct ieee802_11_elems elems;
505 : const u8 *ie;
506 : size_t ie_len;
507 1553 : struct sta_info *sta = NULL;
508 : size_t i, resp_len;
509 : int noack;
510 : enum ssid_match_result res;
511 :
512 1553 : ie = mgmt->u.probe_req.variable;
513 1553 : if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
514 106 : return;
515 1553 : ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
516 :
517 2265 : for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
518 1424 : if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
519 712 : mgmt->sa, mgmt->da, mgmt->bssid,
520 : ie, ie_len, ssi_signal) > 0)
521 0 : return;
522 :
523 1553 : if (!hapd->iconf->send_probe_response)
524 0 : return;
525 :
526 1553 : if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
527 0 : wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
528 0 : MAC2STR(mgmt->sa));
529 0 : return;
530 : }
531 :
532 1553 : if ((!elems.ssid || !elems.supp_rates)) {
533 0 : wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
534 : "without SSID or supported rates element",
535 0 : MAC2STR(mgmt->sa));
536 0 : return;
537 : }
538 :
539 : #ifdef CONFIG_P2P
540 247 : if (hapd->p2p && elems.wps_ie) {
541 : struct wpabuf *wps;
542 240 : wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
543 240 : if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
544 3 : wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
545 : "due to mismatch with Requested Device "
546 : "Type");
547 3 : wpabuf_free(wps);
548 3 : return;
549 : }
550 237 : wpabuf_free(wps);
551 : }
552 :
553 244 : if (hapd->p2p && elems.p2p) {
554 : struct wpabuf *p2p;
555 236 : p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
556 236 : if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
557 2 : wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
558 : "due to mismatch with Device ID");
559 2 : wpabuf_free(p2p);
560 2 : return;
561 : }
562 234 : wpabuf_free(p2p);
563 : }
564 : #endif /* CONFIG_P2P */
565 :
566 1554 : if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
567 6 : elems.ssid_list_len == 0) {
568 36 : wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
569 36 : "broadcast SSID ignored", MAC2STR(mgmt->sa));
570 6 : return;
571 : }
572 :
573 1542 : sta = ap_get_sta(hapd, mgmt->sa);
574 :
575 : #ifdef CONFIG_P2P
576 467 : if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
577 308 : elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
578 83 : os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
579 : P2P_WILDCARD_SSID_LEN) == 0) {
580 : /* Process P2P Wildcard SSID like Wildcard SSID */
581 83 : elems.ssid_len = 0;
582 : }
583 : #endif /* CONFIG_P2P */
584 :
585 1542 : res = ssid_match(hapd, elems.ssid, elems.ssid_len,
586 1542 : elems.ssid_list, elems.ssid_list_len);
587 1542 : if (res != NO_SSID_MATCH) {
588 1462 : if (sta)
589 138 : sta->ssid_probe = &hapd->conf->ssid;
590 : } else {
591 80 : if (!(mgmt->da[0] & 0x01)) {
592 0 : wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
593 : " for foreign SSID '%s' (DA " MACSTR ")%s",
594 0 : MAC2STR(mgmt->sa),
595 0 : wpa_ssid_txt(elems.ssid, elems.ssid_len),
596 0 : MAC2STR(mgmt->da),
597 0 : elems.ssid_list ? " (SSID list)" : "");
598 : }
599 80 : return;
600 : }
601 :
602 : #ifdef CONFIG_INTERWORKING
603 1727 : if (hapd->conf->interworking &&
604 499 : elems.interworking && elems.interworking_len >= 1) {
605 234 : u8 ant = elems.interworking[0] & 0x0f;
606 244 : if (ant != INTERWORKING_ANT_WILDCARD &&
607 10 : ant != hapd->conf->access_network_type) {
608 35 : wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
609 : " for mismatching ANT %u ignored",
610 30 : MAC2STR(mgmt->sa), ant);
611 5 : return;
612 : }
613 : }
614 :
615 1686 : if (hapd->conf->interworking && elems.interworking &&
616 453 : (elems.interworking_len == 7 || elems.interworking_len == 9)) {
617 : const u8 *hessid;
618 5 : if (elems.interworking_len == 7)
619 5 : hessid = elems.interworking + 1;
620 : else
621 0 : hessid = elems.interworking + 1 + 2;
622 10 : if (!is_broadcast_ether_addr(hessid) &&
623 5 : os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
624 36 : wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
625 : " for mismatching HESSID " MACSTR
626 : " ignored",
627 36 : MAC2STR(mgmt->sa), MAC2STR(hessid));
628 3 : return;
629 : }
630 : }
631 : #endif /* CONFIG_INTERWORKING */
632 :
633 : #ifdef CONFIG_P2P
634 467 : if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
635 225 : supp_rates_11b_only(&elems)) {
636 : /* Indicates support for 11b rates only */
637 0 : wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
638 : MACSTR " with only 802.11b rates",
639 0 : MAC2STR(mgmt->sa));
640 0 : return;
641 : }
642 : #endif /* CONFIG_P2P */
643 :
644 : /* TODO: verify that supp_rates contains at least one matching rate
645 : * with AP configuration */
646 :
647 : #ifdef CONFIG_TESTING_OPTIONS
648 1466 : if (hapd->iconf->ignore_probe_probability > 0.0 &&
649 12 : drand48() < hapd->iconf->ignore_probe_probability) {
650 42 : wpa_printf(MSG_INFO,
651 : "TESTING: ignoring probe request from " MACSTR,
652 42 : MAC2STR(mgmt->sa));
653 7 : return;
654 : }
655 : #endif /* CONFIG_TESTING_OPTIONS */
656 :
657 1447 : resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
658 : &resp_len);
659 1447 : if (resp == NULL)
660 0 : return;
661 :
662 : /*
663 : * If this is a broadcast probe request, apply no ack policy to avoid
664 : * excessive retries.
665 : */
666 2677 : noack = !!(res == WILDCARD_SSID_MATCH &&
667 1230 : is_broadcast_ether_addr(mgmt->da));
668 :
669 1447 : if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
670 3 : wpa_printf(MSG_INFO, "handle_probe_req: send failed");
671 :
672 1447 : os_free(resp);
673 :
674 10129 : wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
675 8682 : "SSID", MAC2STR(mgmt->sa),
676 1447 : elems.ssid_len == 0 ? "broadcast" : "our");
677 : }
678 :
679 :
680 1654 : static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
681 : size_t *resp_len)
682 : {
683 : /* check probe response offloading caps and print warnings */
684 1654 : if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
685 1654 : return NULL;
686 :
687 : #ifdef CONFIG_WPS
688 0 : if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
689 0 : (!(hapd->iface->probe_resp_offloads &
690 : (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
691 : WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
692 0 : wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
693 : "Probe Response while not supporting this");
694 : #endif /* CONFIG_WPS */
695 :
696 : #ifdef CONFIG_P2P
697 0 : if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
698 0 : !(hapd->iface->probe_resp_offloads &
699 : WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
700 0 : wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
701 : "Probe Response while not supporting this");
702 : #endif /* CONFIG_P2P */
703 :
704 0 : if (hapd->conf->interworking &&
705 0 : !(hapd->iface->probe_resp_offloads &
706 : WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
707 0 : wpa_printf(MSG_WARNING, "Device is trying to offload "
708 : "Interworking Probe Response while not supporting "
709 : "this");
710 :
711 : /* Generate a Probe Response template for the non-P2P case */
712 0 : return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
713 : }
714 :
715 : #endif /* NEED_AP_MLME */
716 :
717 :
718 1654 : int ieee802_11_build_ap_params(struct hostapd_data *hapd,
719 : struct wpa_driver_ap_params *params)
720 : {
721 1654 : struct ieee80211_mgmt *head = NULL;
722 1654 : u8 *tail = NULL;
723 1654 : size_t head_len = 0, tail_len = 0;
724 1654 : u8 *resp = NULL;
725 1654 : size_t resp_len = 0;
726 : #ifdef NEED_AP_MLME
727 : u16 capab_info;
728 : u8 *pos, *tailpos;
729 :
730 : #define BEACON_HEAD_BUF_SIZE 256
731 : #define BEACON_TAIL_BUF_SIZE 512
732 1654 : head = os_zalloc(BEACON_HEAD_BUF_SIZE);
733 1654 : tail_len = BEACON_TAIL_BUF_SIZE;
734 : #ifdef CONFIG_WPS
735 1654 : if (hapd->conf->wps_state && hapd->wps_beacon_ie)
736 1125 : tail_len += wpabuf_len(hapd->wps_beacon_ie);
737 : #endif /* CONFIG_WPS */
738 : #ifdef CONFIG_P2P
739 881 : if (hapd->p2p_beacon_ie)
740 860 : tail_len += wpabuf_len(hapd->p2p_beacon_ie);
741 : #endif /* CONFIG_P2P */
742 1654 : if (hapd->conf->vendor_elements)
743 1 : tail_len += wpabuf_len(hapd->conf->vendor_elements);
744 1654 : tailpos = tail = os_malloc(tail_len);
745 1654 : if (head == NULL || tail == NULL) {
746 0 : wpa_printf(MSG_ERROR, "Failed to set beacon data");
747 0 : os_free(head);
748 0 : os_free(tail);
749 0 : return -1;
750 : }
751 :
752 1654 : head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
753 : WLAN_FC_STYPE_BEACON);
754 1654 : head->duration = host_to_le16(0);
755 1654 : os_memset(head->da, 0xff, ETH_ALEN);
756 :
757 1654 : os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
758 1654 : os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
759 1654 : head->u.beacon.beacon_int =
760 1654 : host_to_le16(hapd->iconf->beacon_int);
761 :
762 : /* hardware or low-level driver will setup seq_ctrl and timestamp */
763 1654 : capab_info = hostapd_own_capab_info(hapd, NULL, 0);
764 1654 : head->u.beacon.capab_info = host_to_le16(capab_info);
765 1654 : pos = &head->u.beacon.variable[0];
766 :
767 : /* SSID */
768 1654 : *pos++ = WLAN_EID_SSID;
769 1654 : if (hapd->conf->ignore_broadcast_ssid == 2) {
770 : /* clear the data, but keep the correct length of the SSID */
771 1 : *pos++ = hapd->conf->ssid.ssid_len;
772 1 : os_memset(pos, 0, hapd->conf->ssid.ssid_len);
773 1 : pos += hapd->conf->ssid.ssid_len;
774 1653 : } else if (hapd->conf->ignore_broadcast_ssid) {
775 2 : *pos++ = 0; /* empty SSID */
776 : } else {
777 1651 : *pos++ = hapd->conf->ssid.ssid_len;
778 1651 : os_memcpy(pos, hapd->conf->ssid.ssid,
779 : hapd->conf->ssid.ssid_len);
780 1651 : pos += hapd->conf->ssid.ssid_len;
781 : }
782 :
783 : /* Supported rates */
784 1654 : pos = hostapd_eid_supp_rates(hapd, pos);
785 :
786 : /* DS Params */
787 1654 : pos = hostapd_eid_ds_params(hapd, pos);
788 :
789 1654 : head_len = pos - (u8 *) head;
790 :
791 1654 : tailpos = hostapd_eid_country(hapd, tailpos,
792 1654 : tail + BEACON_TAIL_BUF_SIZE - tailpos);
793 :
794 : /* Power Constraint element */
795 1654 : tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
796 :
797 : /* ERP Information element */
798 1654 : tailpos = hostapd_eid_erp_info(hapd, tailpos);
799 :
800 : /* Extended supported rates */
801 1654 : tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
802 :
803 : /* RSN, MDIE, WPA */
804 1654 : tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
805 : tailpos);
806 :
807 1654 : tailpos = hostapd_eid_bss_load(hapd, tailpos,
808 1654 : tail + BEACON_TAIL_BUF_SIZE - tailpos);
809 :
810 : #ifdef CONFIG_IEEE80211N
811 1654 : tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
812 1654 : tailpos = hostapd_eid_ht_operation(hapd, tailpos);
813 : #endif /* CONFIG_IEEE80211N */
814 :
815 1654 : tailpos = hostapd_eid_ext_capab(hapd, tailpos);
816 :
817 : /*
818 : * TODO: Time Advertisement element should only be included in some
819 : * DTIM Beacon frames.
820 : */
821 1654 : tailpos = hostapd_eid_time_adv(hapd, tailpos);
822 :
823 1654 : tailpos = hostapd_eid_interworking(hapd, tailpos);
824 1654 : tailpos = hostapd_eid_adv_proto(hapd, tailpos);
825 1654 : tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
826 1654 : tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
827 1654 : &hapd->iface->cs_c_off_beacon);
828 : #ifdef CONFIG_IEEE80211AC
829 773 : tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
830 773 : tailpos = hostapd_eid_vht_operation(hapd, tailpos);
831 : #endif /* CONFIG_IEEE80211AC */
832 :
833 : /* Wi-Fi Alliance WMM */
834 1654 : tailpos = hostapd_eid_wmm(hapd, tailpos);
835 :
836 : #ifdef CONFIG_WPS
837 1654 : if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
838 1125 : os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
839 : wpabuf_len(hapd->wps_beacon_ie));
840 1125 : tailpos += wpabuf_len(hapd->wps_beacon_ie);
841 : }
842 : #endif /* CONFIG_WPS */
843 :
844 : #ifdef CONFIG_P2P
845 881 : if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
846 860 : os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
847 : wpabuf_len(hapd->p2p_beacon_ie));
848 860 : tailpos += wpabuf_len(hapd->p2p_beacon_ie);
849 : }
850 : #endif /* CONFIG_P2P */
851 : #ifdef CONFIG_P2P_MANAGER
852 773 : if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
853 : P2P_MANAGE)
854 5 : tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
855 : #endif /* CONFIG_P2P_MANAGER */
856 :
857 : #ifdef CONFIG_HS20
858 1654 : tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
859 1654 : tailpos = hostapd_eid_osen(hapd, tailpos);
860 : #endif /* CONFIG_HS20 */
861 :
862 1654 : if (hapd->conf->vendor_elements) {
863 1 : os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
864 : wpabuf_len(hapd->conf->vendor_elements));
865 1 : tailpos += wpabuf_len(hapd->conf->vendor_elements);
866 : }
867 :
868 1654 : tail_len = tailpos > tail ? tailpos - tail : 0;
869 :
870 1654 : resp = hostapd_probe_resp_offloads(hapd, &resp_len);
871 : #endif /* NEED_AP_MLME */
872 :
873 1654 : os_memset(params, 0, sizeof(*params));
874 1654 : params->head = (u8 *) head;
875 1654 : params->head_len = head_len;
876 1654 : params->tail = tail;
877 1654 : params->tail_len = tail_len;
878 1654 : params->proberesp = resp;
879 1654 : params->proberesp_len = resp_len;
880 1654 : params->dtim_period = hapd->conf->dtim_period;
881 1654 : params->beacon_int = hapd->iconf->beacon_int;
882 1654 : params->basic_rates = hapd->iface->basic_rates;
883 1654 : params->ssid = hapd->conf->ssid.ssid;
884 1654 : params->ssid_len = hapd->conf->ssid.ssid_len;
885 3308 : params->pairwise_ciphers = hapd->conf->rsn_pairwise ?
886 1654 : hapd->conf->rsn_pairwise : hapd->conf->wpa_pairwise;
887 1654 : params->group_cipher = hapd->conf->wpa_group;
888 1654 : params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
889 1654 : params->auth_algs = hapd->conf->auth_algs;
890 1654 : params->wpa_version = hapd->conf->wpa;
891 3310 : params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
892 218 : (hapd->conf->ieee802_1x &&
893 4 : (hapd->conf->default_wep_key_len ||
894 1 : hapd->conf->individual_wep_key_len));
895 1654 : switch (hapd->conf->ignore_broadcast_ssid) {
896 : case 0:
897 1651 : params->hide_ssid = NO_SSID_HIDING;
898 1651 : break;
899 : case 1:
900 2 : params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
901 2 : break;
902 : case 2:
903 1 : params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
904 1 : break;
905 : }
906 1654 : params->isolate = hapd->conf->isolate;
907 : #ifdef NEED_AP_MLME
908 1654 : params->cts_protect = !!(ieee802_11_erp_info(hapd) &
909 : ERP_INFO_USE_PROTECTION);
910 3297 : params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
911 1643 : hapd->iconf->preamble == SHORT_PREAMBLE;
912 3306 : if (hapd->iface->current_mode &&
913 1652 : hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
914 1598 : params->short_slot_time =
915 1598 : hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
916 : else
917 56 : params->short_slot_time = -1;
918 1654 : if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
919 45 : params->ht_opmode = -1;
920 : else
921 1609 : params->ht_opmode = hapd->iface->ht_op_mode;
922 : #endif /* NEED_AP_MLME */
923 1654 : params->interworking = hapd->conf->interworking;
924 1759 : if (hapd->conf->interworking &&
925 105 : !is_zero_ether_addr(hapd->conf->hessid))
926 46 : params->hessid = hapd->conf->hessid;
927 1654 : params->access_network_type = hapd->conf->access_network_type;
928 1654 : params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
929 : #ifdef CONFIG_HS20
930 1654 : params->disable_dgaf = hapd->conf->disable_dgaf;
931 1654 : if (hapd->conf->osen) {
932 1 : params->privacy = 1;
933 1 : params->osen = 1;
934 : }
935 : #endif /* CONFIG_HS20 */
936 1654 : return 0;
937 : }
938 :
939 :
940 1654 : void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
941 : {
942 1654 : os_free(params->tail);
943 1654 : params->tail = NULL;
944 1654 : os_free(params->head);
945 1654 : params->head = NULL;
946 1654 : os_free(params->proberesp);
947 1654 : params->proberesp = NULL;
948 1654 : }
949 :
950 :
951 1650 : int ieee802_11_set_beacon(struct hostapd_data *hapd)
952 : {
953 : struct wpa_driver_ap_params params;
954 : struct hostapd_freq_params freq;
955 1650 : struct hostapd_iface *iface = hapd->iface;
956 1650 : struct hostapd_config *iconf = iface->conf;
957 : struct wpabuf *beacon, *proberesp, *assocresp;
958 1650 : int res, ret = -1;
959 :
960 1650 : if (hapd->iface->csa_in_progress) {
961 0 : wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
962 0 : return -1;
963 : }
964 :
965 1650 : hapd->beacon_set_done = 1;
966 :
967 1650 : if (ieee802_11_build_ap_params(hapd, ¶ms) < 0)
968 0 : return -1;
969 :
970 1650 : if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
971 : 0)
972 0 : goto fail;
973 :
974 1650 : params.beacon_ies = beacon;
975 1650 : params.proberesp_ies = proberesp;
976 1650 : params.assocresp_ies = assocresp;
977 :
978 3298 : if (iface->current_mode &&
979 8240 : hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
980 1648 : iconf->channel, iconf->ieee80211n,
981 : iconf->ieee80211ac,
982 : iconf->secondary_channel,
983 1648 : iconf->vht_oper_chwidth,
984 1648 : iconf->vht_oper_centr_freq_seg0_idx,
985 1648 : iconf->vht_oper_centr_freq_seg1_idx,
986 1648 : iface->current_mode->vht_capab) == 0)
987 1648 : params.freq = &freq;
988 :
989 1650 : res = hostapd_drv_set_ap(hapd, ¶ms);
990 1650 : hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
991 1650 : if (res)
992 0 : wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
993 : else
994 1650 : ret = 0;
995 : fail:
996 1650 : ieee802_11_free_ap_params(¶ms);
997 1650 : return ret;
998 : }
999 :
1000 :
1001 481 : int ieee802_11_set_beacons(struct hostapd_iface *iface)
1002 : {
1003 : size_t i;
1004 481 : int ret = 0;
1005 :
1006 966 : for (i = 0; i < iface->num_bss; i++) {
1007 970 : if (iface->bss[i]->started &&
1008 485 : ieee802_11_set_beacon(iface->bss[i]) < 0)
1009 0 : ret = -1;
1010 : }
1011 :
1012 481 : return ret;
1013 : }
1014 :
1015 :
1016 : /* only update beacons if started */
1017 3 : int ieee802_11_update_beacons(struct hostapd_iface *iface)
1018 : {
1019 : size_t i;
1020 3 : int ret = 0;
1021 :
1022 6 : for (i = 0; i < iface->num_bss; i++) {
1023 6 : if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1024 3 : ieee802_11_set_beacon(iface->bss[i]) < 0)
1025 0 : ret = -1;
1026 : }
1027 :
1028 3 : return ret;
1029 : }
1030 :
1031 : #endif /* CONFIG_NATIVE_WINDOWS */
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