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 2221 : static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
36 : {
37 : #ifdef CONFIG_TESTING_OPTIONS
38 2221 : 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 2221 : return eid;
48 : }
49 :
50 :
51 3033 : static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
52 : {
53 3033 : u8 erp = 0;
54 :
55 6066 : if (hapd->iface->current_mode == NULL ||
56 3033 : hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
57 37 : return 0;
58 :
59 2996 : if (hapd->iface->olbc)
60 2 : erp |= ERP_INFO_USE_PROTECTION;
61 2996 : if (hapd->iface->num_sta_non_erp > 0) {
62 0 : erp |= ERP_INFO_NON_ERP_PRESENT |
63 : ERP_INFO_USE_PROTECTION;
64 : }
65 5992 : if (hapd->iface->num_sta_no_short_preamble > 0 ||
66 2996 : hapd->iconf->preamble == LONG_PREAMBLE)
67 2993 : erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
68 :
69 2996 : return erp;
70 : }
71 :
72 :
73 2221 : static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
74 : {
75 2221 : *eid++ = WLAN_EID_DS_PARAMS;
76 2221 : *eid++ = 1;
77 2221 : *eid++ = hapd->iconf->channel;
78 2221 : return eid;
79 : }
80 :
81 :
82 2221 : static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
83 : {
84 4442 : if (hapd->iface->current_mode == NULL ||
85 2221 : hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
86 58 : 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 2163 : *eid++ = WLAN_EID_ERP_INFO;
99 2163 : *eid++ = 1;
100 2163 : *eid++ = ieee802_11_erp_info(hapd);
101 :
102 2163 : return eid;
103 : }
104 :
105 :
106 2221 : static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
107 : {
108 2221 : u8 *pos = eid;
109 2221 : u8 local_pwr_constraint = 0;
110 : int dfs;
111 :
112 4442 : if (hapd->iface->current_mode == NULL ||
113 2221 : hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
114 2173 : return eid;
115 :
116 : /* Let host drivers add this IE if DFS support is offloaded */
117 48 : if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
118 0 : return eid;
119 :
120 : /*
121 : * There is no DFS support and power constraint was not directly
122 : * requested by config option.
123 : */
124 85 : if (!hapd->iconf->ieee80211h &&
125 37 : hapd->iconf->local_pwr_constraint == -1)
126 35 : return eid;
127 :
128 : /* Check if DFS is required by regulatory. */
129 13 : dfs = hostapd_is_dfs_required(hapd->iface);
130 13 : if (dfs < 0) {
131 0 : wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d",
132 : dfs);
133 0 : dfs = 0;
134 : }
135 :
136 13 : if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1)
137 2 : return eid;
138 :
139 : /*
140 : * ieee80211h (DFS) is enabled so Power Constraint element shall
141 : * be added when running on DFS channel whenever local_pwr_constraint
142 : * is configured or not. In order to meet regulations when TPC is not
143 : * implemented using a transmit power that is below the legal maximum
144 : * (including any mitigation factor) should help. In this case,
145 : * indicate 3 dB below maximum allowed transmit power.
146 : */
147 11 : if (hapd->iconf->local_pwr_constraint == -1)
148 9 : local_pwr_constraint = 3;
149 :
150 : /*
151 : * A STA that is not an AP shall use a transmit power less than or
152 : * equal to the local maximum transmit power level for the channel.
153 : * The local maximum transmit power can be calculated from the formula:
154 : * local max TX pwr = max TX pwr - local pwr constraint
155 : * Where max TX pwr is maximum transmit power level specified for
156 : * channel in Country element and local pwr constraint is specified
157 : * for channel in this Power Constraint element.
158 : */
159 :
160 : /* Element ID */
161 11 : *pos++ = WLAN_EID_PWR_CONSTRAINT;
162 : /* Length */
163 11 : *pos++ = 1;
164 : /* Local Power Constraint */
165 11 : if (local_pwr_constraint)
166 9 : *pos++ = local_pwr_constraint;
167 : else
168 2 : *pos++ = hapd->iconf->local_pwr_constraint;
169 :
170 11 : return pos;
171 : }
172 :
173 :
174 26 : static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
175 : struct hostapd_channel_data *start,
176 : struct hostapd_channel_data *prev)
177 : {
178 26 : if (end - pos < 3)
179 0 : return pos;
180 :
181 : /* first channel number */
182 26 : *pos++ = start->chan;
183 : /* number of channels */
184 26 : *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
185 : /* maximum transmit power level */
186 26 : *pos++ = start->max_tx_power;
187 :
188 26 : return pos;
189 : }
190 :
191 :
192 2221 : static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
193 : int max_len)
194 : {
195 2221 : u8 *pos = eid;
196 2221 : u8 *end = eid + max_len;
197 : int i;
198 : struct hostapd_hw_modes *mode;
199 : struct hostapd_channel_data *start, *prev;
200 2221 : int chan_spacing = 1;
201 :
202 2236 : if (!hapd->iconf->ieee80211d || max_len < 6 ||
203 15 : hapd->iface->current_mode == NULL)
204 2206 : return eid;
205 :
206 15 : *pos++ = WLAN_EID_COUNTRY;
207 15 : pos++; /* length will be set later */
208 15 : os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
209 15 : pos += 3;
210 :
211 15 : mode = hapd->iface->current_mode;
212 15 : if (mode->mode == HOSTAPD_MODE_IEEE80211A)
213 15 : chan_spacing = 4;
214 :
215 15 : start = prev = NULL;
216 375 : for (i = 0; i < mode->num_channels; i++) {
217 360 : struct hostapd_channel_data *chan = &mode->channels[i];
218 360 : if (chan->flag & HOSTAPD_CHAN_DISABLED)
219 135 : continue;
220 435 : if (start && prev &&
221 409 : prev->chan + chan_spacing == chan->chan &&
222 199 : start->max_tx_power == chan->max_tx_power) {
223 199 : prev = chan;
224 199 : continue; /* can use same entry */
225 : }
226 :
227 26 : if (start && prev) {
228 11 : pos = hostapd_eid_country_add(pos, end, chan_spacing,
229 : start, prev);
230 11 : start = NULL;
231 : }
232 :
233 : /* Start new group */
234 26 : start = prev = chan;
235 : }
236 :
237 15 : if (start) {
238 15 : pos = hostapd_eid_country_add(pos, end, chan_spacing,
239 : start, prev);
240 : }
241 :
242 15 : if ((pos - eid) & 1) {
243 11 : if (end - pos < 1)
244 0 : return eid;
245 11 : *pos++ = 0; /* pad for 16-bit alignment */
246 : }
247 :
248 15 : eid[1] = (pos - eid) - 2;
249 :
250 15 : return pos;
251 : }
252 :
253 :
254 2221 : static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
255 : {
256 : const u8 *ie;
257 : size_t ielen;
258 :
259 2221 : ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
260 2221 : if (ie == NULL || ielen > len)
261 716 : return eid;
262 :
263 1505 : os_memcpy(eid, ie, ielen);
264 1505 : return eid + ielen;
265 : }
266 :
267 :
268 2221 : static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
269 : {
270 : u8 chan;
271 :
272 2221 : if (!hapd->cs_freq_params.freq)
273 2219 : return eid;
274 :
275 2 : if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) ==
276 : NUM_HOSTAPD_MODES)
277 0 : return eid;
278 :
279 2 : *eid++ = WLAN_EID_CHANNEL_SWITCH;
280 2 : *eid++ = 3;
281 2 : *eid++ = hapd->cs_block_tx;
282 2 : *eid++ = chan;
283 2 : *eid++ = hapd->cs_count;
284 :
285 2 : return eid;
286 : }
287 :
288 :
289 2 : static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
290 : {
291 : u8 sec_ch;
292 :
293 2 : if (!hapd->cs_freq_params.sec_channel_offset)
294 1 : return eid;
295 :
296 1 : if (hapd->cs_freq_params.sec_channel_offset == -1)
297 0 : sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
298 1 : else if (hapd->cs_freq_params.sec_channel_offset == 1)
299 0 : sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
300 : else
301 1 : return eid;
302 :
303 0 : *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
304 0 : *eid++ = 1;
305 0 : *eid++ = sec_ch;
306 :
307 0 : return eid;
308 : }
309 :
310 :
311 2221 : static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
312 : u8 *start, unsigned int *csa_counter_off)
313 : {
314 2221 : u8 *old_pos = pos;
315 :
316 2221 : if (!csa_counter_off)
317 0 : return pos;
318 :
319 2221 : *csa_counter_off = 0;
320 2221 : pos = hostapd_eid_csa(hapd, pos);
321 :
322 2221 : if (pos != old_pos) {
323 : /* save an offset to the counter - should be last byte */
324 2 : *csa_counter_off = pos - start - 1;
325 2 : pos = hostapd_eid_secondary_channel(hapd, pos);
326 : }
327 :
328 2221 : return pos;
329 : }
330 :
331 :
332 1351 : static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
333 : struct sta_info *sta,
334 : const struct ieee80211_mgmt *req,
335 : int is_p2p, size_t *resp_len)
336 : {
337 : struct ieee80211_mgmt *resp;
338 : u8 *pos, *epos;
339 : size_t buflen;
340 :
341 : #define MAX_PROBERESP_LEN 768
342 1351 : buflen = MAX_PROBERESP_LEN;
343 : #ifdef CONFIG_WPS
344 1351 : if (hapd->wps_probe_resp_ie)
345 163 : buflen += wpabuf_len(hapd->wps_probe_resp_ie);
346 : #endif /* CONFIG_WPS */
347 : #ifdef CONFIG_P2P
348 : if (hapd->p2p_probe_resp_ie)
349 : buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
350 : #endif /* CONFIG_P2P */
351 1351 : if (hapd->conf->vendor_elements)
352 1 : buflen += wpabuf_len(hapd->conf->vendor_elements);
353 1351 : resp = os_zalloc(buflen);
354 1351 : if (resp == NULL)
355 0 : return NULL;
356 :
357 1351 : epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
358 :
359 1351 : resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
360 : WLAN_FC_STYPE_PROBE_RESP);
361 1351 : if (req)
362 1351 : os_memcpy(resp->da, req->sa, ETH_ALEN);
363 1351 : os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
364 :
365 1351 : os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
366 1351 : resp->u.probe_resp.beacon_int =
367 1351 : host_to_le16(hapd->iconf->beacon_int);
368 :
369 : /* hardware or low-level driver will setup seq_ctrl and timestamp */
370 1351 : resp->u.probe_resp.capab_info =
371 1351 : host_to_le16(hostapd_own_capab_info(hapd, sta, 1));
372 :
373 1351 : pos = resp->u.probe_resp.variable;
374 1351 : *pos++ = WLAN_EID_SSID;
375 1351 : *pos++ = hapd->conf->ssid.ssid_len;
376 1351 : os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
377 1351 : pos += hapd->conf->ssid.ssid_len;
378 :
379 : /* Supported rates */
380 1351 : pos = hostapd_eid_supp_rates(hapd, pos);
381 :
382 : /* DS Params */
383 1351 : pos = hostapd_eid_ds_params(hapd, pos);
384 :
385 1351 : pos = hostapd_eid_country(hapd, pos, epos - pos);
386 :
387 : /* Power Constraint element */
388 1351 : pos = hostapd_eid_pwr_constraint(hapd, pos);
389 :
390 : /* ERP Information element */
391 1351 : pos = hostapd_eid_erp_info(hapd, pos);
392 :
393 : /* Extended supported rates */
394 1351 : pos = hostapd_eid_ext_supp_rates(hapd, pos);
395 :
396 : /* RSN, MDIE, WPA */
397 1351 : pos = hostapd_eid_wpa(hapd, pos, epos - pos);
398 :
399 1351 : pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
400 :
401 : #ifdef CONFIG_IEEE80211N
402 1351 : pos = hostapd_eid_ht_capabilities(hapd, pos);
403 1351 : pos = hostapd_eid_ht_operation(hapd, pos);
404 : #endif /* CONFIG_IEEE80211N */
405 :
406 1351 : pos = hostapd_eid_ext_capab(hapd, pos);
407 :
408 1351 : pos = hostapd_eid_time_adv(hapd, pos);
409 1351 : pos = hostapd_eid_time_zone(hapd, pos);
410 :
411 1351 : pos = hostapd_eid_interworking(hapd, pos);
412 1351 : pos = hostapd_eid_adv_proto(hapd, pos);
413 1351 : pos = hostapd_eid_roaming_consortium(hapd, pos);
414 :
415 1351 : pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
416 : &hapd->cs_c_off_proberesp);
417 : #ifdef CONFIG_IEEE80211AC
418 1351 : pos = hostapd_eid_vht_capabilities(hapd, pos);
419 1351 : pos = hostapd_eid_vht_operation(hapd, pos);
420 : #endif /* CONFIG_IEEE80211AC */
421 :
422 : /* Wi-Fi Alliance WMM */
423 1351 : pos = hostapd_eid_wmm(hapd, pos);
424 :
425 : #ifdef CONFIG_WPS
426 1351 : if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
427 163 : os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
428 : wpabuf_len(hapd->wps_probe_resp_ie));
429 163 : pos += wpabuf_len(hapd->wps_probe_resp_ie);
430 : }
431 : #endif /* CONFIG_WPS */
432 :
433 : #ifdef CONFIG_P2P
434 : if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
435 : hapd->p2p_probe_resp_ie) {
436 : os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
437 : wpabuf_len(hapd->p2p_probe_resp_ie));
438 : pos += wpabuf_len(hapd->p2p_probe_resp_ie);
439 : }
440 : #endif /* CONFIG_P2P */
441 : #ifdef CONFIG_P2P_MANAGER
442 1351 : if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
443 : P2P_MANAGE)
444 6 : pos = hostapd_eid_p2p_manage(hapd, pos);
445 : #endif /* CONFIG_P2P_MANAGER */
446 :
447 : #ifdef CONFIG_HS20
448 1351 : pos = hostapd_eid_hs20_indication(hapd, pos);
449 1351 : pos = hostapd_eid_osen(hapd, pos);
450 : #endif /* CONFIG_HS20 */
451 :
452 1351 : if (hapd->conf->vendor_elements) {
453 1 : os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
454 : wpabuf_len(hapd->conf->vendor_elements));
455 1 : pos += wpabuf_len(hapd->conf->vendor_elements);
456 : }
457 :
458 1351 : *resp_len = pos - (u8 *) resp;
459 1351 : return (u8 *) resp;
460 : }
461 :
462 :
463 : enum ssid_match_result {
464 : NO_SSID_MATCH,
465 : EXACT_SSID_MATCH,
466 : WILDCARD_SSID_MATCH
467 : };
468 :
469 1466 : static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
470 : const u8 *ssid, size_t ssid_len,
471 : const u8 *ssid_list,
472 : size_t ssid_list_len)
473 : {
474 : const u8 *pos, *end;
475 1466 : int wildcard = 0;
476 :
477 1466 : if (ssid_len == 0)
478 1250 : wildcard = 1;
479 1598 : if (ssid_len == hapd->conf->ssid.ssid_len &&
480 132 : os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
481 119 : return EXACT_SSID_MATCH;
482 :
483 1347 : if (ssid_list == NULL)
484 1347 : return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
485 :
486 0 : pos = ssid_list;
487 0 : end = ssid_list + ssid_list_len;
488 0 : while (pos + 1 <= end) {
489 0 : if (pos + 2 + pos[1] > end)
490 0 : break;
491 0 : if (pos[1] == 0)
492 0 : wildcard = 1;
493 0 : if (pos[1] == hapd->conf->ssid.ssid_len &&
494 0 : os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
495 0 : return EXACT_SSID_MATCH;
496 0 : pos += 2 + pos[1];
497 : }
498 :
499 0 : return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
500 : }
501 :
502 :
503 1475 : void handle_probe_req(struct hostapd_data *hapd,
504 : const struct ieee80211_mgmt *mgmt, size_t len,
505 : int ssi_signal)
506 : {
507 : u8 *resp;
508 : struct ieee802_11_elems elems;
509 : const u8 *ie;
510 : size_t ie_len;
511 1475 : struct sta_info *sta = NULL;
512 : size_t i, resp_len;
513 : int noack;
514 : enum ssid_match_result res;
515 :
516 1475 : ie = mgmt->u.probe_req.variable;
517 1475 : if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
518 124 : return;
519 1475 : ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
520 :
521 1653 : for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
522 356 : if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
523 178 : mgmt->sa, mgmt->da, mgmt->bssid,
524 : ie, ie_len, ssi_signal) > 0)
525 0 : return;
526 :
527 1475 : if (!hapd->iconf->send_probe_response)
528 0 : return;
529 :
530 1475 : if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
531 0 : wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
532 0 : MAC2STR(mgmt->sa));
533 0 : return;
534 : }
535 :
536 1475 : if ((!elems.ssid || !elems.supp_rates)) {
537 0 : wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
538 : "without SSID or supported rates element",
539 0 : MAC2STR(mgmt->sa));
540 0 : return;
541 : }
542 :
543 : #ifdef CONFIG_P2P
544 : if (hapd->p2p && elems.wps_ie) {
545 : struct wpabuf *wps;
546 : wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
547 : if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
548 : wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
549 : "due to mismatch with Requested Device "
550 : "Type");
551 : wpabuf_free(wps);
552 : return;
553 : }
554 : wpabuf_free(wps);
555 : }
556 :
557 : if (hapd->p2p && elems.p2p) {
558 : struct wpabuf *p2p;
559 : p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
560 : if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
561 : wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
562 : "due to mismatch with Device ID");
563 : wpabuf_free(p2p);
564 : return;
565 : }
566 : wpabuf_free(p2p);
567 : }
568 : #endif /* CONFIG_P2P */
569 :
570 1484 : if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
571 9 : elems.ssid_list_len == 0) {
572 54 : wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
573 54 : "broadcast SSID ignored", MAC2STR(mgmt->sa));
574 9 : return;
575 : }
576 :
577 1466 : sta = ap_get_sta(hapd, mgmt->sa);
578 :
579 : #ifdef CONFIG_P2P
580 : if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
581 : elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
582 : os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
583 : P2P_WILDCARD_SSID_LEN) == 0) {
584 : /* Process P2P Wildcard SSID like Wildcard SSID */
585 : elems.ssid_len = 0;
586 : }
587 : #endif /* CONFIG_P2P */
588 :
589 1466 : res = ssid_match(hapd, elems.ssid, elems.ssid_len,
590 1466 : elems.ssid_list, elems.ssid_list_len);
591 1466 : if (res != NO_SSID_MATCH) {
592 1369 : if (sta)
593 196 : sta->ssid_probe = &hapd->conf->ssid;
594 : } else {
595 97 : if (!(mgmt->da[0] & 0x01)) {
596 0 : wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
597 : " for foreign SSID '%s' (DA " MACSTR ")%s",
598 0 : MAC2STR(mgmt->sa),
599 0 : wpa_ssid_txt(elems.ssid, elems.ssid_len),
600 0 : MAC2STR(mgmt->da),
601 0 : elems.ssid_list ? " (SSID list)" : "");
602 : }
603 97 : return;
604 : }
605 :
606 : #ifdef CONFIG_INTERWORKING
607 1653 : if (hapd->conf->interworking &&
608 535 : elems.interworking && elems.interworking_len >= 1) {
609 251 : u8 ant = elems.interworking[0] & 0x0f;
610 261 : if (ant != INTERWORKING_ANT_WILDCARD &&
611 10 : ant != hapd->conf->access_network_type) {
612 35 : wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
613 : " for mismatching ANT %u ignored",
614 30 : MAC2STR(mgmt->sa), ant);
615 5 : return;
616 : }
617 : }
618 :
619 1610 : if (hapd->conf->interworking && elems.interworking &&
620 487 : (elems.interworking_len == 7 || elems.interworking_len == 9)) {
621 : const u8 *hessid;
622 5 : if (elems.interworking_len == 7)
623 5 : hessid = elems.interworking + 1;
624 : else
625 0 : hessid = elems.interworking + 1 + 2;
626 10 : if (!is_broadcast_ether_addr(hessid) &&
627 5 : os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
628 36 : wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
629 : " for mismatching HESSID " MACSTR
630 : " ignored",
631 36 : MAC2STR(mgmt->sa), MAC2STR(hessid));
632 3 : return;
633 : }
634 : }
635 : #endif /* CONFIG_INTERWORKING */
636 :
637 : #ifdef CONFIG_P2P
638 : if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
639 : supp_rates_11b_only(&elems)) {
640 : /* Indicates support for 11b rates only */
641 : wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
642 : MACSTR " with only 802.11b rates",
643 : MAC2STR(mgmt->sa));
644 : return;
645 : }
646 : #endif /* CONFIG_P2P */
647 :
648 : /* TODO: verify that supp_rates contains at least one matching rate
649 : * with AP configuration */
650 :
651 : #ifdef CONFIG_TESTING_OPTIONS
652 1377 : if (hapd->iconf->ignore_probe_probability > 0.0 &&
653 16 : drand48() < hapd->iconf->ignore_probe_probability) {
654 60 : wpa_printf(MSG_INFO,
655 : "TESTING: ignoring probe request from " MACSTR,
656 60 : MAC2STR(mgmt->sa));
657 10 : return;
658 : }
659 : #endif /* CONFIG_TESTING_OPTIONS */
660 :
661 1351 : resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL,
662 : &resp_len);
663 1351 : if (resp == NULL)
664 0 : return;
665 :
666 : /*
667 : * If this is a broadcast probe request, apply no ack policy to avoid
668 : * excessive retries.
669 : */
670 2586 : noack = !!(res == WILDCARD_SSID_MATCH &&
671 1235 : is_broadcast_ether_addr(mgmt->da));
672 :
673 1351 : if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
674 3 : wpa_printf(MSG_INFO, "handle_probe_req: send failed");
675 :
676 1351 : os_free(resp);
677 :
678 9457 : wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
679 8106 : "SSID", MAC2STR(mgmt->sa),
680 1351 : elems.ssid_len == 0 ? "broadcast" : "our");
681 : }
682 :
683 :
684 870 : static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
685 : size_t *resp_len)
686 : {
687 : /* check probe response offloading caps and print warnings */
688 870 : if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
689 870 : return NULL;
690 :
691 : #ifdef CONFIG_WPS
692 0 : if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
693 0 : (!(hapd->iface->probe_resp_offloads &
694 : (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
695 : WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
696 0 : wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
697 : "Probe Response while not supporting this");
698 : #endif /* CONFIG_WPS */
699 :
700 : #ifdef CONFIG_P2P
701 : if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
702 : !(hapd->iface->probe_resp_offloads &
703 : WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
704 : wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
705 : "Probe Response while not supporting this");
706 : #endif /* CONFIG_P2P */
707 :
708 0 : if (hapd->conf->interworking &&
709 0 : !(hapd->iface->probe_resp_offloads &
710 : WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
711 0 : wpa_printf(MSG_WARNING, "Device is trying to offload "
712 : "Interworking Probe Response while not supporting "
713 : "this");
714 :
715 : /* Generate a Probe Response template for the non-P2P case */
716 0 : return hostapd_gen_probe_resp(hapd, NULL, NULL, 0, resp_len);
717 : }
718 :
719 : #endif /* NEED_AP_MLME */
720 :
721 :
722 870 : int ieee802_11_build_ap_params(struct hostapd_data *hapd,
723 : struct wpa_driver_ap_params *params)
724 : {
725 870 : struct ieee80211_mgmt *head = NULL;
726 870 : u8 *tail = NULL;
727 870 : size_t head_len = 0, tail_len = 0;
728 870 : u8 *resp = NULL;
729 870 : size_t resp_len = 0;
730 : #ifdef NEED_AP_MLME
731 : u16 capab_info;
732 : u8 *pos, *tailpos;
733 :
734 : #define BEACON_HEAD_BUF_SIZE 256
735 : #define BEACON_TAIL_BUF_SIZE 512
736 870 : head = os_zalloc(BEACON_HEAD_BUF_SIZE);
737 870 : tail_len = BEACON_TAIL_BUF_SIZE;
738 : #ifdef CONFIG_WPS
739 870 : if (hapd->conf->wps_state && hapd->wps_beacon_ie)
740 255 : tail_len += wpabuf_len(hapd->wps_beacon_ie);
741 : #endif /* CONFIG_WPS */
742 : #ifdef CONFIG_P2P
743 : if (hapd->p2p_beacon_ie)
744 : tail_len += wpabuf_len(hapd->p2p_beacon_ie);
745 : #endif /* CONFIG_P2P */
746 870 : if (hapd->conf->vendor_elements)
747 1 : tail_len += wpabuf_len(hapd->conf->vendor_elements);
748 870 : tailpos = tail = os_malloc(tail_len);
749 870 : if (head == NULL || tail == NULL) {
750 0 : wpa_printf(MSG_ERROR, "Failed to set beacon data");
751 0 : os_free(head);
752 0 : os_free(tail);
753 0 : return -1;
754 : }
755 :
756 870 : head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
757 : WLAN_FC_STYPE_BEACON);
758 870 : head->duration = host_to_le16(0);
759 870 : os_memset(head->da, 0xff, ETH_ALEN);
760 :
761 870 : os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
762 870 : os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
763 870 : head->u.beacon.beacon_int =
764 870 : host_to_le16(hapd->iconf->beacon_int);
765 :
766 : /* hardware or low-level driver will setup seq_ctrl and timestamp */
767 870 : capab_info = hostapd_own_capab_info(hapd, NULL, 0);
768 870 : head->u.beacon.capab_info = host_to_le16(capab_info);
769 870 : pos = &head->u.beacon.variable[0];
770 :
771 : /* SSID */
772 870 : *pos++ = WLAN_EID_SSID;
773 870 : if (hapd->conf->ignore_broadcast_ssid == 2) {
774 : /* clear the data, but keep the correct length of the SSID */
775 1 : *pos++ = hapd->conf->ssid.ssid_len;
776 1 : os_memset(pos, 0, hapd->conf->ssid.ssid_len);
777 1 : pos += hapd->conf->ssid.ssid_len;
778 869 : } else if (hapd->conf->ignore_broadcast_ssid) {
779 3 : *pos++ = 0; /* empty SSID */
780 : } else {
781 866 : *pos++ = hapd->conf->ssid.ssid_len;
782 866 : os_memcpy(pos, hapd->conf->ssid.ssid,
783 : hapd->conf->ssid.ssid_len);
784 866 : pos += hapd->conf->ssid.ssid_len;
785 : }
786 :
787 : /* Supported rates */
788 870 : pos = hostapd_eid_supp_rates(hapd, pos);
789 :
790 : /* DS Params */
791 870 : pos = hostapd_eid_ds_params(hapd, pos);
792 :
793 870 : head_len = pos - (u8 *) head;
794 :
795 870 : tailpos = hostapd_eid_country(hapd, tailpos,
796 870 : tail + BEACON_TAIL_BUF_SIZE - tailpos);
797 :
798 : /* Power Constraint element */
799 870 : tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
800 :
801 : /* ERP Information element */
802 870 : tailpos = hostapd_eid_erp_info(hapd, tailpos);
803 :
804 : /* Extended supported rates */
805 870 : tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
806 :
807 : /* RSN, MDIE, WPA */
808 870 : tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
809 : tailpos);
810 :
811 870 : tailpos = hostapd_eid_bss_load(hapd, tailpos,
812 870 : tail + BEACON_TAIL_BUF_SIZE - tailpos);
813 :
814 : #ifdef CONFIG_IEEE80211N
815 870 : tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
816 870 : tailpos = hostapd_eid_ht_operation(hapd, tailpos);
817 : #endif /* CONFIG_IEEE80211N */
818 :
819 870 : tailpos = hostapd_eid_ext_capab(hapd, tailpos);
820 :
821 : /*
822 : * TODO: Time Advertisement element should only be included in some
823 : * DTIM Beacon frames.
824 : */
825 870 : tailpos = hostapd_eid_time_adv(hapd, tailpos);
826 :
827 870 : tailpos = hostapd_eid_interworking(hapd, tailpos);
828 870 : tailpos = hostapd_eid_adv_proto(hapd, tailpos);
829 870 : tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
830 870 : tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
831 : &hapd->cs_c_off_beacon);
832 : #ifdef CONFIG_IEEE80211AC
833 870 : tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
834 870 : tailpos = hostapd_eid_vht_operation(hapd, tailpos);
835 : #endif /* CONFIG_IEEE80211AC */
836 :
837 : /* Wi-Fi Alliance WMM */
838 870 : tailpos = hostapd_eid_wmm(hapd, tailpos);
839 :
840 : #ifdef CONFIG_WPS
841 870 : if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
842 255 : os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
843 : wpabuf_len(hapd->wps_beacon_ie));
844 255 : tailpos += wpabuf_len(hapd->wps_beacon_ie);
845 : }
846 : #endif /* CONFIG_WPS */
847 :
848 : #ifdef CONFIG_P2P
849 : if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
850 : os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
851 : wpabuf_len(hapd->p2p_beacon_ie));
852 : tailpos += wpabuf_len(hapd->p2p_beacon_ie);
853 : }
854 : #endif /* CONFIG_P2P */
855 : #ifdef CONFIG_P2P_MANAGER
856 870 : if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
857 : P2P_MANAGE)
858 5 : tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
859 : #endif /* CONFIG_P2P_MANAGER */
860 :
861 : #ifdef CONFIG_HS20
862 870 : tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
863 870 : tailpos = hostapd_eid_osen(hapd, tailpos);
864 : #endif /* CONFIG_HS20 */
865 :
866 870 : if (hapd->conf->vendor_elements) {
867 1 : os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
868 : wpabuf_len(hapd->conf->vendor_elements));
869 1 : tailpos += wpabuf_len(hapd->conf->vendor_elements);
870 : }
871 :
872 870 : tail_len = tailpos > tail ? tailpos - tail : 0;
873 :
874 870 : resp = hostapd_probe_resp_offloads(hapd, &resp_len);
875 : #endif /* NEED_AP_MLME */
876 :
877 870 : os_memset(params, 0, sizeof(*params));
878 870 : params->head = (u8 *) head;
879 870 : params->head_len = head_len;
880 870 : params->tail = tail;
881 870 : params->tail_len = tail_len;
882 870 : params->proberesp = resp;
883 870 : params->proberesp_len = resp_len;
884 870 : params->dtim_period = hapd->conf->dtim_period;
885 870 : params->beacon_int = hapd->iconf->beacon_int;
886 870 : params->basic_rates = hapd->iface->basic_rates;
887 870 : params->ssid = hapd->conf->ssid.ssid;
888 870 : params->ssid_len = hapd->conf->ssid.ssid_len;
889 1740 : params->pairwise_ciphers = hapd->conf->wpa_pairwise |
890 870 : hapd->conf->rsn_pairwise;
891 870 : params->group_cipher = hapd->conf->wpa_group;
892 870 : params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
893 870 : params->auth_algs = hapd->conf->auth_algs;
894 870 : params->wpa_version = hapd->conf->wpa;
895 1742 : params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
896 247 : (hapd->conf->ieee802_1x &&
897 4 : (hapd->conf->default_wep_key_len ||
898 1 : hapd->conf->individual_wep_key_len));
899 870 : switch (hapd->conf->ignore_broadcast_ssid) {
900 : case 0:
901 866 : params->hide_ssid = NO_SSID_HIDING;
902 866 : break;
903 : case 1:
904 3 : params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
905 3 : break;
906 : case 2:
907 1 : params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
908 1 : break;
909 : }
910 870 : params->isolate = hapd->conf->isolate;
911 : #ifdef NEED_AP_MLME
912 870 : params->cts_protect = !!(ieee802_11_erp_info(hapd) &
913 : ERP_INFO_USE_PROTECTION);
914 1735 : params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
915 865 : hapd->iconf->preamble == SHORT_PREAMBLE;
916 1740 : if (hapd->iface->current_mode &&
917 870 : hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
918 833 : params->short_slot_time =
919 833 : hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
920 : else
921 37 : params->short_slot_time = -1;
922 870 : if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
923 48 : params->ht_opmode = -1;
924 : else
925 822 : params->ht_opmode = hapd->iface->ht_op_mode;
926 : #endif /* NEED_AP_MLME */
927 870 : params->interworking = hapd->conf->interworking;
928 978 : if (hapd->conf->interworking &&
929 108 : !is_zero_ether_addr(hapd->conf->hessid))
930 49 : params->hessid = hapd->conf->hessid;
931 870 : params->access_network_type = hapd->conf->access_network_type;
932 870 : params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
933 : #ifdef CONFIG_HS20
934 870 : params->disable_dgaf = hapd->conf->disable_dgaf;
935 870 : if (hapd->conf->osen) {
936 1 : params->privacy = 1;
937 1 : params->osen = 1;
938 : }
939 : #endif /* CONFIG_HS20 */
940 870 : return 0;
941 : }
942 :
943 :
944 870 : void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
945 : {
946 870 : os_free(params->tail);
947 870 : params->tail = NULL;
948 870 : os_free(params->head);
949 870 : params->head = NULL;
950 870 : os_free(params->proberesp);
951 870 : params->proberesp = NULL;
952 870 : }
953 :
954 :
955 866 : int ieee802_11_set_beacon(struct hostapd_data *hapd)
956 : {
957 : struct wpa_driver_ap_params params;
958 : struct hostapd_freq_params freq;
959 866 : struct hostapd_iface *iface = hapd->iface;
960 866 : struct hostapd_config *iconf = iface->conf;
961 : struct wpabuf *beacon, *proberesp, *assocresp;
962 866 : int res, ret = -1;
963 :
964 866 : if (hapd->csa_in_progress) {
965 0 : wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
966 0 : return -1;
967 : }
968 :
969 866 : hapd->beacon_set_done = 1;
970 :
971 866 : if (ieee802_11_build_ap_params(hapd, ¶ms) < 0)
972 0 : return -1;
973 :
974 866 : if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
975 : 0)
976 0 : goto fail;
977 :
978 866 : params.beacon_ies = beacon;
979 866 : params.proberesp_ies = proberesp;
980 866 : params.assocresp_ies = assocresp;
981 :
982 1732 : if (iface->current_mode &&
983 4330 : hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
984 866 : iconf->channel, iconf->ieee80211n,
985 : iconf->ieee80211ac,
986 : iconf->secondary_channel,
987 866 : iconf->vht_oper_chwidth,
988 866 : iconf->vht_oper_centr_freq_seg0_idx,
989 866 : iconf->vht_oper_centr_freq_seg1_idx,
990 866 : iface->current_mode->vht_capab) == 0)
991 866 : params.freq = &freq;
992 :
993 866 : res = hostapd_drv_set_ap(hapd, ¶ms);
994 866 : hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
995 866 : if (res)
996 0 : wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
997 : else
998 866 : ret = 0;
999 : fail:
1000 866 : ieee802_11_free_ap_params(¶ms);
1001 866 : return ret;
1002 : }
1003 :
1004 :
1005 41 : int ieee802_11_set_beacons(struct hostapd_iface *iface)
1006 : {
1007 : size_t i;
1008 41 : int ret = 0;
1009 :
1010 86 : for (i = 0; i < iface->num_bss; i++) {
1011 90 : if (iface->bss[i]->started &&
1012 45 : ieee802_11_set_beacon(iface->bss[i]) < 0)
1013 0 : ret = -1;
1014 : }
1015 :
1016 41 : return ret;
1017 : }
1018 :
1019 :
1020 : /* only update beacons if started */
1021 3 : int ieee802_11_update_beacons(struct hostapd_iface *iface)
1022 : {
1023 : size_t i;
1024 3 : int ret = 0;
1025 :
1026 6 : for (i = 0; i < iface->num_bss; i++) {
1027 6 : if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1028 3 : ieee802_11_set_beacon(iface->bss[i]) < 0)
1029 0 : ret = -1;
1030 : }
1031 :
1032 3 : return ret;
1033 : }
1034 :
1035 : #endif /* CONFIG_NATIVE_WINDOWS */
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