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 "common/hw_features_common.h"
19 #include "wps/wps_defs.h"
20 #include "p2p/p2p.h"
21 #include "hostapd.h"
22 #include "ieee802_11.h"
23 #include "wpa_auth.h"
24 #include "wmm.h"
25 #include "ap_config.h"
26 #include "sta_info.h"
27 #include "p2p_hostapd.h"
28 #include "ap_drv_ops.h"
29 #include "beacon.h"
30 #include "hs20.h"
31 #include "dfs.h"
32
33
34 #ifdef NEED_AP_MLME
35
hostapd_eid_rm_enabled_capab(struct hostapd_data * hapd,u8 * eid,size_t len)36 static u8 * hostapd_eid_rm_enabled_capab(struct hostapd_data *hapd, u8 *eid,
37 size_t len)
38 {
39 if (!hapd->conf->radio_measurements || len < 2 + 4)
40 return eid;
41
42 *eid++ = WLAN_EID_RRM_ENABLED_CAPABILITIES;
43 *eid++ = 5;
44 *eid++ = (hapd->conf->radio_measurements & BIT(0)) ?
45 WLAN_RRM_CAPS_NEIGHBOR_REPORT : 0x00;
46 *eid++ = 0x00;
47 *eid++ = 0x00;
48 *eid++ = 0x00;
49 *eid++ = 0x00;
50 return eid;
51 }
52
53
hostapd_eid_bss_load(struct hostapd_data * hapd,u8 * eid,size_t len)54 static u8 * hostapd_eid_bss_load(struct hostapd_data *hapd, u8 *eid, size_t len)
55 {
56 if (len < 2 + 5)
57 return eid;
58
59 #ifdef CONFIG_TESTING_OPTIONS
60 if (hapd->conf->bss_load_test_set) {
61 *eid++ = WLAN_EID_BSS_LOAD;
62 *eid++ = 5;
63 os_memcpy(eid, hapd->conf->bss_load_test, 5);
64 eid += 5;
65 return eid;
66 }
67 #endif /* CONFIG_TESTING_OPTIONS */
68 if (hapd->conf->bss_load_update_period) {
69 *eid++ = WLAN_EID_BSS_LOAD;
70 *eid++ = 5;
71 WPA_PUT_LE16(eid, hapd->num_sta);
72 eid += 2;
73 *eid++ = hapd->iface->channel_utilization;
74 WPA_PUT_LE16(eid, 0); /* no available admission capabity */
75 eid += 2;
76 }
77 return eid;
78 }
79
80
ieee802_11_erp_info(struct hostapd_data * hapd)81 static u8 ieee802_11_erp_info(struct hostapd_data *hapd)
82 {
83 u8 erp = 0;
84
85 if (hapd->iface->current_mode == NULL ||
86 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
87 return 0;
88
89 if (hapd->iface->olbc)
90 erp |= ERP_INFO_USE_PROTECTION;
91 if (hapd->iface->num_sta_non_erp > 0) {
92 erp |= ERP_INFO_NON_ERP_PRESENT |
93 ERP_INFO_USE_PROTECTION;
94 }
95 if (hapd->iface->num_sta_no_short_preamble > 0 ||
96 hapd->iconf->preamble == LONG_PREAMBLE)
97 erp |= ERP_INFO_BARKER_PREAMBLE_MODE;
98
99 return erp;
100 }
101
102
hostapd_eid_ds_params(struct hostapd_data * hapd,u8 * eid)103 static u8 * hostapd_eid_ds_params(struct hostapd_data *hapd, u8 *eid)
104 {
105 *eid++ = WLAN_EID_DS_PARAMS;
106 *eid++ = 1;
107 *eid++ = hapd->iconf->channel;
108 return eid;
109 }
110
111
hostapd_eid_erp_info(struct hostapd_data * hapd,u8 * eid)112 static u8 * hostapd_eid_erp_info(struct hostapd_data *hapd, u8 *eid)
113 {
114 if (hapd->iface->current_mode == NULL ||
115 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
116 return eid;
117
118 /* Set NonERP_present and use_protection bits if there
119 * are any associated NonERP stations. */
120 /* TODO: use_protection bit can be set to zero even if
121 * there are NonERP stations present. This optimization
122 * might be useful if NonERP stations are "quiet".
123 * See 802.11g/D6 E-1 for recommended practice.
124 * In addition, Non ERP present might be set, if AP detects Non ERP
125 * operation on other APs. */
126
127 /* Add ERP Information element */
128 *eid++ = WLAN_EID_ERP_INFO;
129 *eid++ = 1;
130 *eid++ = ieee802_11_erp_info(hapd);
131
132 return eid;
133 }
134
135
hostapd_eid_pwr_constraint(struct hostapd_data * hapd,u8 * eid)136 static u8 * hostapd_eid_pwr_constraint(struct hostapd_data *hapd, u8 *eid)
137 {
138 u8 *pos = eid;
139 u8 local_pwr_constraint = 0;
140 int dfs;
141
142 if (hapd->iface->current_mode == NULL ||
143 hapd->iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
144 return eid;
145
146 /* Let host drivers add this IE if DFS support is offloaded */
147 if (hapd->iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
148 return eid;
149
150 /*
151 * There is no DFS support and power constraint was not directly
152 * requested by config option.
153 */
154 if (!hapd->iconf->ieee80211h &&
155 hapd->iconf->local_pwr_constraint == -1)
156 return eid;
157
158 /* Check if DFS is required by regulatory. */
159 dfs = hostapd_is_dfs_required(hapd->iface);
160 if (dfs < 0) {
161 wpa_printf(MSG_WARNING, "Failed to check if DFS is required; ret=%d",
162 dfs);
163 dfs = 0;
164 }
165
166 if (dfs == 0 && hapd->iconf->local_pwr_constraint == -1)
167 return eid;
168
169 /*
170 * ieee80211h (DFS) is enabled so Power Constraint element shall
171 * be added when running on DFS channel whenever local_pwr_constraint
172 * is configured or not. In order to meet regulations when TPC is not
173 * implemented using a transmit power that is below the legal maximum
174 * (including any mitigation factor) should help. In this case,
175 * indicate 3 dB below maximum allowed transmit power.
176 */
177 if (hapd->iconf->local_pwr_constraint == -1)
178 local_pwr_constraint = 3;
179
180 /*
181 * A STA that is not an AP shall use a transmit power less than or
182 * equal to the local maximum transmit power level for the channel.
183 * The local maximum transmit power can be calculated from the formula:
184 * local max TX pwr = max TX pwr - local pwr constraint
185 * Where max TX pwr is maximum transmit power level specified for
186 * channel in Country element and local pwr constraint is specified
187 * for channel in this Power Constraint element.
188 */
189
190 /* Element ID */
191 *pos++ = WLAN_EID_PWR_CONSTRAINT;
192 /* Length */
193 *pos++ = 1;
194 /* Local Power Constraint */
195 if (local_pwr_constraint)
196 *pos++ = local_pwr_constraint;
197 else
198 *pos++ = hapd->iconf->local_pwr_constraint;
199
200 return pos;
201 }
202
203
hostapd_eid_country_add(u8 * pos,u8 * end,int chan_spacing,struct hostapd_channel_data * start,struct hostapd_channel_data * prev)204 static u8 * hostapd_eid_country_add(u8 *pos, u8 *end, int chan_spacing,
205 struct hostapd_channel_data *start,
206 struct hostapd_channel_data *prev)
207 {
208 if (end - pos < 3)
209 return pos;
210
211 /* first channel number */
212 *pos++ = start->chan;
213 /* number of channels */
214 *pos++ = (prev->chan - start->chan) / chan_spacing + 1;
215 /* maximum transmit power level */
216 *pos++ = start->max_tx_power;
217
218 return pos;
219 }
220
221
hostapd_eid_country(struct hostapd_data * hapd,u8 * eid,int max_len)222 static u8 * hostapd_eid_country(struct hostapd_data *hapd, u8 *eid,
223 int max_len)
224 {
225 u8 *pos = eid;
226 u8 *end = eid + max_len;
227 int i;
228 struct hostapd_hw_modes *mode;
229 struct hostapd_channel_data *start, *prev;
230 int chan_spacing = 1;
231
232 if (!hapd->iconf->ieee80211d || max_len < 6 ||
233 hapd->iface->current_mode == NULL)
234 return eid;
235
236 *pos++ = WLAN_EID_COUNTRY;
237 pos++; /* length will be set later */
238 os_memcpy(pos, hapd->iconf->country, 3); /* e.g., 'US ' */
239 pos += 3;
240
241 mode = hapd->iface->current_mode;
242 if (mode->mode == HOSTAPD_MODE_IEEE80211A)
243 chan_spacing = 4;
244
245 start = prev = NULL;
246 for (i = 0; i < mode->num_channels; i++) {
247 struct hostapd_channel_data *chan = &mode->channels[i];
248 if (chan->flag & HOSTAPD_CHAN_DISABLED)
249 continue;
250 if (start && prev &&
251 prev->chan + chan_spacing == chan->chan &&
252 start->max_tx_power == chan->max_tx_power) {
253 prev = chan;
254 continue; /* can use same entry */
255 }
256
257 if (start && prev) {
258 pos = hostapd_eid_country_add(pos, end, chan_spacing,
259 start, prev);
260 start = NULL;
261 }
262
263 /* Start new group */
264 start = prev = chan;
265 }
266
267 if (start) {
268 pos = hostapd_eid_country_add(pos, end, chan_spacing,
269 start, prev);
270 }
271
272 if ((pos - eid) & 1) {
273 if (end - pos < 1)
274 return eid;
275 *pos++ = 0; /* pad for 16-bit alignment */
276 }
277
278 eid[1] = (pos - eid) - 2;
279
280 return pos;
281 }
282
283
hostapd_eid_wpa(struct hostapd_data * hapd,u8 * eid,size_t len)284 static u8 * hostapd_eid_wpa(struct hostapd_data *hapd, u8 *eid, size_t len)
285 {
286 const u8 *ie;
287 size_t ielen;
288
289 ie = wpa_auth_get_wpa_ie(hapd->wpa_auth, &ielen);
290 if (ie == NULL || ielen > len)
291 return eid;
292
293 os_memcpy(eid, ie, ielen);
294 return eid + ielen;
295 }
296
297
hostapd_eid_csa(struct hostapd_data * hapd,u8 * eid)298 static u8 * hostapd_eid_csa(struct hostapd_data *hapd, u8 *eid)
299 {
300 u8 chan;
301
302 if (!hapd->cs_freq_params.freq)
303 return eid;
304
305 if (ieee80211_freq_to_chan(hapd->cs_freq_params.freq, &chan) ==
306 NUM_HOSTAPD_MODES)
307 return eid;
308
309 *eid++ = WLAN_EID_CHANNEL_SWITCH;
310 *eid++ = 3;
311 *eid++ = hapd->cs_block_tx;
312 *eid++ = chan;
313 *eid++ = hapd->cs_count;
314
315 return eid;
316 }
317
318
hostapd_eid_secondary_channel(struct hostapd_data * hapd,u8 * eid)319 static u8 * hostapd_eid_secondary_channel(struct hostapd_data *hapd, u8 *eid)
320 {
321 u8 sec_ch;
322
323 if (!hapd->cs_freq_params.sec_channel_offset)
324 return eid;
325
326 if (hapd->cs_freq_params.sec_channel_offset == -1)
327 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW;
328 else if (hapd->cs_freq_params.sec_channel_offset == 1)
329 sec_ch = HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE;
330 else
331 return eid;
332
333 *eid++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;
334 *eid++ = 1;
335 *eid++ = sec_ch;
336
337 return eid;
338 }
339
340
hostapd_add_csa_elems(struct hostapd_data * hapd,u8 * pos,u8 * start,unsigned int * csa_counter_off)341 static u8 * hostapd_add_csa_elems(struct hostapd_data *hapd, u8 *pos,
342 u8 *start, unsigned int *csa_counter_off)
343 {
344 u8 *old_pos = pos;
345
346 if (!csa_counter_off)
347 return pos;
348
349 *csa_counter_off = 0;
350 pos = hostapd_eid_csa(hapd, pos);
351
352 if (pos != old_pos) {
353 /* save an offset to the counter - should be last byte */
354 *csa_counter_off = pos - start - 1;
355 pos = hostapd_eid_secondary_channel(hapd, pos);
356 }
357
358 return pos;
359 }
360
361
hostapd_gen_probe_resp(struct hostapd_data * hapd,const struct ieee80211_mgmt * req,int is_p2p,size_t * resp_len)362 static u8 * hostapd_gen_probe_resp(struct hostapd_data *hapd,
363 const struct ieee80211_mgmt *req,
364 int is_p2p, size_t *resp_len)
365 {
366 struct ieee80211_mgmt *resp;
367 u8 *pos, *epos;
368 size_t buflen;
369
370 #define MAX_PROBERESP_LEN 768
371 buflen = MAX_PROBERESP_LEN;
372 #ifdef CONFIG_WPS
373 if (hapd->wps_probe_resp_ie)
374 buflen += wpabuf_len(hapd->wps_probe_resp_ie);
375 #endif /* CONFIG_WPS */
376 #ifdef CONFIG_P2P
377 if (hapd->p2p_probe_resp_ie)
378 buflen += wpabuf_len(hapd->p2p_probe_resp_ie);
379 #endif /* CONFIG_P2P */
380 if (hapd->conf->vendor_elements)
381 buflen += wpabuf_len(hapd->conf->vendor_elements);
382 if (hapd->conf->vendor_vht) {
383 buflen += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) +
384 2 + sizeof(struct ieee80211_vht_operation);
385 }
386 resp = os_zalloc(buflen);
387 if (resp == NULL)
388 return NULL;
389
390 epos = ((u8 *) resp) + MAX_PROBERESP_LEN;
391
392 resp->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
393 WLAN_FC_STYPE_PROBE_RESP);
394 if (req)
395 os_memcpy(resp->da, req->sa, ETH_ALEN);
396 os_memcpy(resp->sa, hapd->own_addr, ETH_ALEN);
397
398 os_memcpy(resp->bssid, hapd->own_addr, ETH_ALEN);
399 resp->u.probe_resp.beacon_int =
400 host_to_le16(hapd->iconf->beacon_int);
401
402 /* hardware or low-level driver will setup seq_ctrl and timestamp */
403 resp->u.probe_resp.capab_info =
404 host_to_le16(hostapd_own_capab_info(hapd));
405
406 pos = resp->u.probe_resp.variable;
407 *pos++ = WLAN_EID_SSID;
408 *pos++ = hapd->conf->ssid.ssid_len;
409 os_memcpy(pos, hapd->conf->ssid.ssid, hapd->conf->ssid.ssid_len);
410 pos += hapd->conf->ssid.ssid_len;
411
412 /* Supported rates */
413 pos = hostapd_eid_supp_rates(hapd, pos);
414
415 /* DS Params */
416 pos = hostapd_eid_ds_params(hapd, pos);
417
418 pos = hostapd_eid_country(hapd, pos, epos - pos);
419
420 /* Power Constraint element */
421 pos = hostapd_eid_pwr_constraint(hapd, pos);
422
423 /* ERP Information element */
424 pos = hostapd_eid_erp_info(hapd, pos);
425
426 /* Extended supported rates */
427 pos = hostapd_eid_ext_supp_rates(hapd, pos);
428
429 /* RSN, MDIE, WPA */
430 pos = hostapd_eid_wpa(hapd, pos, epos - pos);
431
432 pos = hostapd_eid_bss_load(hapd, pos, epos - pos);
433
434 pos = hostapd_eid_rm_enabled_capab(hapd, pos, epos - pos);
435
436 #ifdef CONFIG_IEEE80211N
437 pos = hostapd_eid_ht_capabilities(hapd, pos);
438 pos = hostapd_eid_ht_operation(hapd, pos);
439 #endif /* CONFIG_IEEE80211N */
440
441 pos = hostapd_eid_ext_capab(hapd, pos);
442
443 pos = hostapd_eid_time_adv(hapd, pos);
444 pos = hostapd_eid_time_zone(hapd, pos);
445
446 pos = hostapd_eid_interworking(hapd, pos);
447 pos = hostapd_eid_adv_proto(hapd, pos);
448 pos = hostapd_eid_roaming_consortium(hapd, pos);
449
450 pos = hostapd_add_csa_elems(hapd, pos, (u8 *)resp,
451 &hapd->cs_c_off_proberesp);
452 #ifdef CONFIG_IEEE80211AC
453 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
454 pos = hostapd_eid_vht_capabilities(hapd, pos);
455 pos = hostapd_eid_vht_operation(hapd, pos);
456 }
457 if (hapd->conf->vendor_vht)
458 pos = hostapd_eid_vendor_vht(hapd, pos);
459 #endif /* CONFIG_IEEE80211AC */
460
461 /* Wi-Fi Alliance WMM */
462 pos = hostapd_eid_wmm(hapd, pos);
463
464 #ifdef CONFIG_WPS
465 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie) {
466 os_memcpy(pos, wpabuf_head(hapd->wps_probe_resp_ie),
467 wpabuf_len(hapd->wps_probe_resp_ie));
468 pos += wpabuf_len(hapd->wps_probe_resp_ie);
469 }
470 #endif /* CONFIG_WPS */
471
472 #ifdef CONFIG_P2P
473 if ((hapd->conf->p2p & P2P_ENABLED) && is_p2p &&
474 hapd->p2p_probe_resp_ie) {
475 os_memcpy(pos, wpabuf_head(hapd->p2p_probe_resp_ie),
476 wpabuf_len(hapd->p2p_probe_resp_ie));
477 pos += wpabuf_len(hapd->p2p_probe_resp_ie);
478 }
479 #endif /* CONFIG_P2P */
480 #ifdef CONFIG_P2P_MANAGER
481 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
482 P2P_MANAGE)
483 pos = hostapd_eid_p2p_manage(hapd, pos);
484 #endif /* CONFIG_P2P_MANAGER */
485
486 #ifdef CONFIG_HS20
487 pos = hostapd_eid_hs20_indication(hapd, pos);
488 pos = hostapd_eid_osen(hapd, pos);
489 #endif /* CONFIG_HS20 */
490
491 if (hapd->conf->vendor_elements) {
492 os_memcpy(pos, wpabuf_head(hapd->conf->vendor_elements),
493 wpabuf_len(hapd->conf->vendor_elements));
494 pos += wpabuf_len(hapd->conf->vendor_elements);
495 }
496
497 *resp_len = pos - (u8 *) resp;
498 return (u8 *) resp;
499 }
500
501
502 enum ssid_match_result {
503 NO_SSID_MATCH,
504 EXACT_SSID_MATCH,
505 WILDCARD_SSID_MATCH
506 };
507
ssid_match(struct hostapd_data * hapd,const u8 * ssid,size_t ssid_len,const u8 * ssid_list,size_t ssid_list_len)508 static enum ssid_match_result ssid_match(struct hostapd_data *hapd,
509 const u8 *ssid, size_t ssid_len,
510 const u8 *ssid_list,
511 size_t ssid_list_len)
512 {
513 const u8 *pos, *end;
514 int wildcard = 0;
515
516 if (ssid_len == 0)
517 wildcard = 1;
518 if (ssid_len == hapd->conf->ssid.ssid_len &&
519 os_memcmp(ssid, hapd->conf->ssid.ssid, ssid_len) == 0)
520 return EXACT_SSID_MATCH;
521
522 if (ssid_list == NULL)
523 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
524
525 pos = ssid_list;
526 end = ssid_list + ssid_list_len;
527 while (pos + 1 <= end) {
528 if (pos + 2 + pos[1] > end)
529 break;
530 if (pos[1] == 0)
531 wildcard = 1;
532 if (pos[1] == hapd->conf->ssid.ssid_len &&
533 os_memcmp(pos + 2, hapd->conf->ssid.ssid, pos[1]) == 0)
534 return EXACT_SSID_MATCH;
535 pos += 2 + pos[1];
536 }
537
538 return wildcard ? WILDCARD_SSID_MATCH : NO_SSID_MATCH;
539 }
540
541
handle_probe_req(struct hostapd_data * hapd,const struct ieee80211_mgmt * mgmt,size_t len,int ssi_signal)542 void handle_probe_req(struct hostapd_data *hapd,
543 const struct ieee80211_mgmt *mgmt, size_t len,
544 int ssi_signal)
545 {
546 u8 *resp;
547 struct ieee802_11_elems elems;
548 const u8 *ie;
549 size_t ie_len;
550 size_t i, resp_len;
551 int noack;
552 enum ssid_match_result res;
553
554 ie = mgmt->u.probe_req.variable;
555 if (len < IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req))
556 return;
557 ie_len = len - (IEEE80211_HDRLEN + sizeof(mgmt->u.probe_req));
558
559 for (i = 0; hapd->probereq_cb && i < hapd->num_probereq_cb; i++)
560 if (hapd->probereq_cb[i].cb(hapd->probereq_cb[i].ctx,
561 mgmt->sa, mgmt->da, mgmt->bssid,
562 ie, ie_len, ssi_signal) > 0)
563 return;
564
565 if (!hapd->iconf->send_probe_response)
566 return;
567
568 if (ieee802_11_parse_elems(ie, ie_len, &elems, 0) == ParseFailed) {
569 wpa_printf(MSG_DEBUG, "Could not parse ProbeReq from " MACSTR,
570 MAC2STR(mgmt->sa));
571 return;
572 }
573
574 if ((!elems.ssid || !elems.supp_rates)) {
575 wpa_printf(MSG_DEBUG, "STA " MACSTR " sent probe request "
576 "without SSID or supported rates element",
577 MAC2STR(mgmt->sa));
578 return;
579 }
580
581 /*
582 * No need to reply if the Probe Request frame was sent on an adjacent
583 * channel. IEEE Std 802.11-2012 describes this as a requirement for an
584 * AP with dot11RadioMeasurementActivated set to true, but strictly
585 * speaking does not allow such ignoring of Probe Request frames if
586 * dot11RadioMeasurementActivated is false. Anyway, this can help reduce
587 * number of unnecessary Probe Response frames for cases where the STA
588 * is less likely to see them (Probe Request frame sent on a
589 * neighboring, but partially overlapping, channel).
590 */
591 if (elems.ds_params &&
592 hapd->iface->current_mode &&
593 (hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G ||
594 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211B) &&
595 hapd->iconf->channel != elems.ds_params[0]) {
596 wpa_printf(MSG_DEBUG,
597 "Ignore Probe Request due to DS Params mismatch: chan=%u != ds.chan=%u",
598 hapd->iconf->channel, elems.ds_params[0]);
599 return;
600 }
601
602 #ifdef CONFIG_P2P
603 if (hapd->p2p && elems.wps_ie) {
604 struct wpabuf *wps;
605 wps = ieee802_11_vendor_ie_concat(ie, ie_len, WPS_DEV_OUI_WFA);
606 if (wps && !p2p_group_match_dev_type(hapd->p2p_group, wps)) {
607 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
608 "due to mismatch with Requested Device "
609 "Type");
610 wpabuf_free(wps);
611 return;
612 }
613 wpabuf_free(wps);
614 }
615
616 if (hapd->p2p && elems.p2p) {
617 struct wpabuf *p2p;
618 p2p = ieee802_11_vendor_ie_concat(ie, ie_len, P2P_IE_VENDOR_TYPE);
619 if (p2p && !p2p_group_match_dev_id(hapd->p2p_group, p2p)) {
620 wpa_printf(MSG_MSGDUMP, "P2P: Ignore Probe Request "
621 "due to mismatch with Device ID");
622 wpabuf_free(p2p);
623 return;
624 }
625 wpabuf_free(p2p);
626 }
627 #endif /* CONFIG_P2P */
628
629 if (hapd->conf->ignore_broadcast_ssid && elems.ssid_len == 0 &&
630 elems.ssid_list_len == 0) {
631 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR " for "
632 "broadcast SSID ignored", MAC2STR(mgmt->sa));
633 return;
634 }
635
636 #ifdef CONFIG_P2P
637 if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
638 elems.ssid_len == P2P_WILDCARD_SSID_LEN &&
639 os_memcmp(elems.ssid, P2P_WILDCARD_SSID,
640 P2P_WILDCARD_SSID_LEN) == 0) {
641 /* Process P2P Wildcard SSID like Wildcard SSID */
642 elems.ssid_len = 0;
643 }
644 #endif /* CONFIG_P2P */
645
646 res = ssid_match(hapd, elems.ssid, elems.ssid_len,
647 elems.ssid_list, elems.ssid_list_len);
648 if (res == NO_SSID_MATCH) {
649 if (!(mgmt->da[0] & 0x01)) {
650 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
651 " for foreign SSID '%s' (DA " MACSTR ")%s",
652 MAC2STR(mgmt->sa),
653 wpa_ssid_txt(elems.ssid, elems.ssid_len),
654 MAC2STR(mgmt->da),
655 elems.ssid_list ? " (SSID list)" : "");
656 }
657 return;
658 }
659
660 #ifdef CONFIG_INTERWORKING
661 if (hapd->conf->interworking &&
662 elems.interworking && elems.interworking_len >= 1) {
663 u8 ant = elems.interworking[0] & 0x0f;
664 if (ant != INTERWORKING_ANT_WILDCARD &&
665 ant != hapd->conf->access_network_type) {
666 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
667 " for mismatching ANT %u ignored",
668 MAC2STR(mgmt->sa), ant);
669 return;
670 }
671 }
672
673 if (hapd->conf->interworking && elems.interworking &&
674 (elems.interworking_len == 7 || elems.interworking_len == 9)) {
675 const u8 *hessid;
676 if (elems.interworking_len == 7)
677 hessid = elems.interworking + 1;
678 else
679 hessid = elems.interworking + 1 + 2;
680 if (!is_broadcast_ether_addr(hessid) &&
681 os_memcmp(hessid, hapd->conf->hessid, ETH_ALEN) != 0) {
682 wpa_printf(MSG_MSGDUMP, "Probe Request from " MACSTR
683 " for mismatching HESSID " MACSTR
684 " ignored",
685 MAC2STR(mgmt->sa), MAC2STR(hessid));
686 return;
687 }
688 }
689 #endif /* CONFIG_INTERWORKING */
690
691 #ifdef CONFIG_P2P
692 if ((hapd->conf->p2p & P2P_GROUP_OWNER) &&
693 supp_rates_11b_only(&elems)) {
694 /* Indicates support for 11b rates only */
695 wpa_printf(MSG_EXCESSIVE, "P2P: Ignore Probe Request from "
696 MACSTR " with only 802.11b rates",
697 MAC2STR(mgmt->sa));
698 return;
699 }
700 #endif /* CONFIG_P2P */
701
702 /* TODO: verify that supp_rates contains at least one matching rate
703 * with AP configuration */
704
705 #ifdef CONFIG_TESTING_OPTIONS
706 if (hapd->iconf->ignore_probe_probability > 0.0 &&
707 drand48() < hapd->iconf->ignore_probe_probability) {
708 wpa_printf(MSG_INFO,
709 "TESTING: ignoring probe request from " MACSTR,
710 MAC2STR(mgmt->sa));
711 return;
712 }
713 #endif /* CONFIG_TESTING_OPTIONS */
714
715 resp = hostapd_gen_probe_resp(hapd, mgmt, elems.p2p != NULL,
716 &resp_len);
717 if (resp == NULL)
718 return;
719
720 /*
721 * If this is a broadcast probe request, apply no ack policy to avoid
722 * excessive retries.
723 */
724 noack = !!(res == WILDCARD_SSID_MATCH &&
725 is_broadcast_ether_addr(mgmt->da));
726
727 if (hostapd_drv_send_mlme(hapd, resp, resp_len, noack) < 0)
728 wpa_printf(MSG_INFO, "handle_probe_req: send failed");
729
730 os_free(resp);
731
732 wpa_printf(MSG_EXCESSIVE, "STA " MACSTR " sent probe request for %s "
733 "SSID", MAC2STR(mgmt->sa),
734 elems.ssid_len == 0 ? "broadcast" : "our");
735 }
736
737
hostapd_probe_resp_offloads(struct hostapd_data * hapd,size_t * resp_len)738 static u8 * hostapd_probe_resp_offloads(struct hostapd_data *hapd,
739 size_t *resp_len)
740 {
741 /* check probe response offloading caps and print warnings */
742 if (!(hapd->iface->drv_flags & WPA_DRIVER_FLAGS_PROBE_RESP_OFFLOAD))
743 return NULL;
744
745 #ifdef CONFIG_WPS
746 if (hapd->conf->wps_state && hapd->wps_probe_resp_ie &&
747 (!(hapd->iface->probe_resp_offloads &
748 (WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS |
749 WPA_DRIVER_PROBE_RESP_OFFLOAD_WPS2))))
750 wpa_printf(MSG_WARNING, "Device is trying to offload WPS "
751 "Probe Response while not supporting this");
752 #endif /* CONFIG_WPS */
753
754 #ifdef CONFIG_P2P
755 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_probe_resp_ie &&
756 !(hapd->iface->probe_resp_offloads &
757 WPA_DRIVER_PROBE_RESP_OFFLOAD_P2P))
758 wpa_printf(MSG_WARNING, "Device is trying to offload P2P "
759 "Probe Response while not supporting this");
760 #endif /* CONFIG_P2P */
761
762 if (hapd->conf->interworking &&
763 !(hapd->iface->probe_resp_offloads &
764 WPA_DRIVER_PROBE_RESP_OFFLOAD_INTERWORKING))
765 wpa_printf(MSG_WARNING, "Device is trying to offload "
766 "Interworking Probe Response while not supporting "
767 "this");
768
769 /* Generate a Probe Response template for the non-P2P case */
770 return hostapd_gen_probe_resp(hapd, NULL, 0, resp_len);
771 }
772
773 #endif /* NEED_AP_MLME */
774
775
ieee802_11_build_ap_params(struct hostapd_data * hapd,struct wpa_driver_ap_params * params)776 int ieee802_11_build_ap_params(struct hostapd_data *hapd,
777 struct wpa_driver_ap_params *params)
778 {
779 struct ieee80211_mgmt *head = NULL;
780 u8 *tail = NULL;
781 size_t head_len = 0, tail_len = 0;
782 u8 *resp = NULL;
783 size_t resp_len = 0;
784 #ifdef NEED_AP_MLME
785 u16 capab_info;
786 u8 *pos, *tailpos;
787
788 #define BEACON_HEAD_BUF_SIZE 256
789 #define BEACON_TAIL_BUF_SIZE 512
790 head = os_zalloc(BEACON_HEAD_BUF_SIZE);
791 tail_len = BEACON_TAIL_BUF_SIZE;
792 #ifdef CONFIG_WPS
793 if (hapd->conf->wps_state && hapd->wps_beacon_ie)
794 tail_len += wpabuf_len(hapd->wps_beacon_ie);
795 #endif /* CONFIG_WPS */
796 #ifdef CONFIG_P2P
797 if (hapd->p2p_beacon_ie)
798 tail_len += wpabuf_len(hapd->p2p_beacon_ie);
799 #endif /* CONFIG_P2P */
800 if (hapd->conf->vendor_elements)
801 tail_len += wpabuf_len(hapd->conf->vendor_elements);
802
803 #ifdef CONFIG_IEEE80211AC
804 if (hapd->conf->vendor_vht) {
805 tail_len += 5 + 2 + sizeof(struct ieee80211_vht_capabilities) +
806 2 + sizeof(struct ieee80211_vht_operation);
807 }
808 #endif /* CONFIG_IEEE80211AC */
809
810 tailpos = tail = os_malloc(tail_len);
811 if (head == NULL || tail == NULL) {
812 wpa_printf(MSG_ERROR, "Failed to set beacon data");
813 os_free(head);
814 os_free(tail);
815 return -1;
816 }
817
818 head->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
819 WLAN_FC_STYPE_BEACON);
820 head->duration = host_to_le16(0);
821 os_memset(head->da, 0xff, ETH_ALEN);
822
823 os_memcpy(head->sa, hapd->own_addr, ETH_ALEN);
824 os_memcpy(head->bssid, hapd->own_addr, ETH_ALEN);
825 head->u.beacon.beacon_int =
826 host_to_le16(hapd->iconf->beacon_int);
827
828 /* hardware or low-level driver will setup seq_ctrl and timestamp */
829 capab_info = hostapd_own_capab_info(hapd);
830 head->u.beacon.capab_info = host_to_le16(capab_info);
831 pos = &head->u.beacon.variable[0];
832
833 /* SSID */
834 *pos++ = WLAN_EID_SSID;
835 if (hapd->conf->ignore_broadcast_ssid == 2) {
836 /* clear the data, but keep the correct length of the SSID */
837 *pos++ = hapd->conf->ssid.ssid_len;
838 os_memset(pos, 0, hapd->conf->ssid.ssid_len);
839 pos += hapd->conf->ssid.ssid_len;
840 } else if (hapd->conf->ignore_broadcast_ssid) {
841 *pos++ = 0; /* empty SSID */
842 } else {
843 *pos++ = hapd->conf->ssid.ssid_len;
844 os_memcpy(pos, hapd->conf->ssid.ssid,
845 hapd->conf->ssid.ssid_len);
846 pos += hapd->conf->ssid.ssid_len;
847 }
848
849 /* Supported rates */
850 pos = hostapd_eid_supp_rates(hapd, pos);
851
852 /* DS Params */
853 pos = hostapd_eid_ds_params(hapd, pos);
854
855 head_len = pos - (u8 *) head;
856
857 tailpos = hostapd_eid_country(hapd, tailpos,
858 tail + BEACON_TAIL_BUF_SIZE - tailpos);
859
860 /* Power Constraint element */
861 tailpos = hostapd_eid_pwr_constraint(hapd, tailpos);
862
863 /* ERP Information element */
864 tailpos = hostapd_eid_erp_info(hapd, tailpos);
865
866 /* Extended supported rates */
867 tailpos = hostapd_eid_ext_supp_rates(hapd, tailpos);
868
869 /* RSN, MDIE, WPA */
870 tailpos = hostapd_eid_wpa(hapd, tailpos, tail + BEACON_TAIL_BUF_SIZE -
871 tailpos);
872
873 tailpos = hostapd_eid_rm_enabled_capab(hapd, tailpos,
874 tail + BEACON_TAIL_BUF_SIZE -
875 tailpos);
876
877 tailpos = hostapd_eid_bss_load(hapd, tailpos,
878 tail + BEACON_TAIL_BUF_SIZE - tailpos);
879
880 #ifdef CONFIG_IEEE80211N
881 tailpos = hostapd_eid_ht_capabilities(hapd, tailpos);
882 tailpos = hostapd_eid_ht_operation(hapd, tailpos);
883 #endif /* CONFIG_IEEE80211N */
884
885 tailpos = hostapd_eid_ext_capab(hapd, tailpos);
886
887 /*
888 * TODO: Time Advertisement element should only be included in some
889 * DTIM Beacon frames.
890 */
891 tailpos = hostapd_eid_time_adv(hapd, tailpos);
892
893 tailpos = hostapd_eid_interworking(hapd, tailpos);
894 tailpos = hostapd_eid_adv_proto(hapd, tailpos);
895 tailpos = hostapd_eid_roaming_consortium(hapd, tailpos);
896 tailpos = hostapd_add_csa_elems(hapd, tailpos, tail,
897 &hapd->cs_c_off_beacon);
898 #ifdef CONFIG_IEEE80211AC
899 if (hapd->iconf->ieee80211ac && !hapd->conf->disable_11ac) {
900 tailpos = hostapd_eid_vht_capabilities(hapd, tailpos);
901 tailpos = hostapd_eid_vht_operation(hapd, tailpos);
902 }
903 if (hapd->conf->vendor_vht)
904 tailpos = hostapd_eid_vendor_vht(hapd, tailpos);
905 #endif /* CONFIG_IEEE80211AC */
906
907 /* Wi-Fi Alliance WMM */
908 tailpos = hostapd_eid_wmm(hapd, tailpos);
909
910 #ifdef CONFIG_WPS
911 if (hapd->conf->wps_state && hapd->wps_beacon_ie) {
912 os_memcpy(tailpos, wpabuf_head(hapd->wps_beacon_ie),
913 wpabuf_len(hapd->wps_beacon_ie));
914 tailpos += wpabuf_len(hapd->wps_beacon_ie);
915 }
916 #endif /* CONFIG_WPS */
917
918 #ifdef CONFIG_P2P
919 if ((hapd->conf->p2p & P2P_ENABLED) && hapd->p2p_beacon_ie) {
920 os_memcpy(tailpos, wpabuf_head(hapd->p2p_beacon_ie),
921 wpabuf_len(hapd->p2p_beacon_ie));
922 tailpos += wpabuf_len(hapd->p2p_beacon_ie);
923 }
924 #endif /* CONFIG_P2P */
925 #ifdef CONFIG_P2P_MANAGER
926 if ((hapd->conf->p2p & (P2P_MANAGE | P2P_ENABLED | P2P_GROUP_OWNER)) ==
927 P2P_MANAGE)
928 tailpos = hostapd_eid_p2p_manage(hapd, tailpos);
929 #endif /* CONFIG_P2P_MANAGER */
930
931 #ifdef CONFIG_HS20
932 tailpos = hostapd_eid_hs20_indication(hapd, tailpos);
933 tailpos = hostapd_eid_osen(hapd, tailpos);
934 #endif /* CONFIG_HS20 */
935
936 if (hapd->conf->vendor_elements) {
937 os_memcpy(tailpos, wpabuf_head(hapd->conf->vendor_elements),
938 wpabuf_len(hapd->conf->vendor_elements));
939 tailpos += wpabuf_len(hapd->conf->vendor_elements);
940 }
941
942 tail_len = tailpos > tail ? tailpos - tail : 0;
943
944 resp = hostapd_probe_resp_offloads(hapd, &resp_len);
945 #endif /* NEED_AP_MLME */
946
947 os_memset(params, 0, sizeof(*params));
948 params->head = (u8 *) head;
949 params->head_len = head_len;
950 params->tail = tail;
951 params->tail_len = tail_len;
952 params->proberesp = resp;
953 params->proberesp_len = resp_len;
954 params->dtim_period = hapd->conf->dtim_period;
955 params->beacon_int = hapd->iconf->beacon_int;
956 params->basic_rates = hapd->iface->basic_rates;
957 params->ssid = hapd->conf->ssid.ssid;
958 params->ssid_len = hapd->conf->ssid.ssid_len;
959 if ((hapd->conf->wpa & (WPA_PROTO_WPA | WPA_PROTO_RSN)) ==
960 (WPA_PROTO_WPA | WPA_PROTO_RSN))
961 params->pairwise_ciphers = hapd->conf->wpa_pairwise |
962 hapd->conf->rsn_pairwise;
963 else if (hapd->conf->wpa & WPA_PROTO_RSN)
964 params->pairwise_ciphers = hapd->conf->rsn_pairwise;
965 else if (hapd->conf->wpa & WPA_PROTO_WPA)
966 params->pairwise_ciphers = hapd->conf->wpa_pairwise;
967 params->group_cipher = hapd->conf->wpa_group;
968 params->key_mgmt_suites = hapd->conf->wpa_key_mgmt;
969 params->auth_algs = hapd->conf->auth_algs;
970 params->wpa_version = hapd->conf->wpa;
971 params->privacy = hapd->conf->ssid.wep.keys_set || hapd->conf->wpa ||
972 (hapd->conf->ieee802_1x &&
973 (hapd->conf->default_wep_key_len ||
974 hapd->conf->individual_wep_key_len));
975 switch (hapd->conf->ignore_broadcast_ssid) {
976 case 0:
977 params->hide_ssid = NO_SSID_HIDING;
978 break;
979 case 1:
980 params->hide_ssid = HIDDEN_SSID_ZERO_LEN;
981 break;
982 case 2:
983 params->hide_ssid = HIDDEN_SSID_ZERO_CONTENTS;
984 break;
985 }
986 params->isolate = hapd->conf->isolate;
987 params->smps_mode = hapd->iconf->ht_capab & HT_CAP_INFO_SMPS_MASK;
988 #ifdef NEED_AP_MLME
989 params->cts_protect = !!(ieee802_11_erp_info(hapd) &
990 ERP_INFO_USE_PROTECTION);
991 params->preamble = hapd->iface->num_sta_no_short_preamble == 0 &&
992 hapd->iconf->preamble == SHORT_PREAMBLE;
993 if (hapd->iface->current_mode &&
994 hapd->iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
995 params->short_slot_time =
996 hapd->iface->num_sta_no_short_slot_time > 0 ? 0 : 1;
997 else
998 params->short_slot_time = -1;
999 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n)
1000 params->ht_opmode = -1;
1001 else
1002 params->ht_opmode = hapd->iface->ht_op_mode;
1003 #endif /* NEED_AP_MLME */
1004 params->interworking = hapd->conf->interworking;
1005 if (hapd->conf->interworking &&
1006 !is_zero_ether_addr(hapd->conf->hessid))
1007 params->hessid = hapd->conf->hessid;
1008 params->access_network_type = hapd->conf->access_network_type;
1009 params->ap_max_inactivity = hapd->conf->ap_max_inactivity;
1010 #ifdef CONFIG_P2P
1011 params->p2p_go_ctwindow = hapd->iconf->p2p_go_ctwindow;
1012 #endif /* CONFIG_P2P */
1013 #ifdef CONFIG_HS20
1014 params->disable_dgaf = hapd->conf->disable_dgaf;
1015 if (hapd->conf->osen) {
1016 params->privacy = 1;
1017 params->osen = 1;
1018 }
1019 #endif /* CONFIG_HS20 */
1020 return 0;
1021 }
1022
1023
ieee802_11_free_ap_params(struct wpa_driver_ap_params * params)1024 void ieee802_11_free_ap_params(struct wpa_driver_ap_params *params)
1025 {
1026 os_free(params->tail);
1027 params->tail = NULL;
1028 os_free(params->head);
1029 params->head = NULL;
1030 os_free(params->proberesp);
1031 params->proberesp = NULL;
1032 }
1033
1034
ieee802_11_set_beacon(struct hostapd_data * hapd)1035 int ieee802_11_set_beacon(struct hostapd_data *hapd)
1036 {
1037 struct wpa_driver_ap_params params;
1038 struct hostapd_freq_params freq;
1039 struct hostapd_iface *iface = hapd->iface;
1040 struct hostapd_config *iconf = iface->conf;
1041 struct wpabuf *beacon, *proberesp, *assocresp;
1042 int res, ret = -1;
1043
1044 if (hapd->csa_in_progress) {
1045 wpa_printf(MSG_ERROR, "Cannot set beacons during CSA period");
1046 return -1;
1047 }
1048
1049 hapd->beacon_set_done = 1;
1050
1051 if (ieee802_11_build_ap_params(hapd, ¶ms) < 0)
1052 return -1;
1053
1054 if (hostapd_build_ap_extra_ies(hapd, &beacon, &proberesp, &assocresp) <
1055 0)
1056 goto fail;
1057
1058 params.beacon_ies = beacon;
1059 params.proberesp_ies = proberesp;
1060 params.assocresp_ies = assocresp;
1061 params.reenable = hapd->reenable_beacon;
1062 hapd->reenable_beacon = 0;
1063
1064 if (iface->current_mode &&
1065 hostapd_set_freq_params(&freq, iconf->hw_mode, iface->freq,
1066 iconf->channel, iconf->ieee80211n,
1067 iconf->ieee80211ac,
1068 iconf->secondary_channel,
1069 iconf->vht_oper_chwidth,
1070 iconf->vht_oper_centr_freq_seg0_idx,
1071 iconf->vht_oper_centr_freq_seg1_idx,
1072 iface->current_mode->vht_capab) == 0)
1073 params.freq = &freq;
1074
1075 res = hostapd_drv_set_ap(hapd, ¶ms);
1076 hostapd_free_ap_extra_ies(hapd, beacon, proberesp, assocresp);
1077 if (res)
1078 wpa_printf(MSG_ERROR, "Failed to set beacon parameters");
1079 else
1080 ret = 0;
1081 fail:
1082 ieee802_11_free_ap_params(¶ms);
1083 return ret;
1084 }
1085
1086
ieee802_11_set_beacons(struct hostapd_iface * iface)1087 int ieee802_11_set_beacons(struct hostapd_iface *iface)
1088 {
1089 size_t i;
1090 int ret = 0;
1091
1092 for (i = 0; i < iface->num_bss; i++) {
1093 if (iface->bss[i]->started &&
1094 ieee802_11_set_beacon(iface->bss[i]) < 0)
1095 ret = -1;
1096 }
1097
1098 return ret;
1099 }
1100
1101
1102 /* only update beacons if started */
ieee802_11_update_beacons(struct hostapd_iface * iface)1103 int ieee802_11_update_beacons(struct hostapd_iface *iface)
1104 {
1105 size_t i;
1106 int ret = 0;
1107
1108 for (i = 0; i < iface->num_bss; i++) {
1109 if (iface->bss[i]->beacon_set_done && iface->bss[i]->started &&
1110 ieee802_11_set_beacon(iface->bss[i]) < 0)
1111 ret = -1;
1112 }
1113
1114 return ret;
1115 }
1116
1117 #endif /* CONFIG_NATIVE_WINDOWS */
1118