1 /*
2 * hostapd / IEEE 802.11n HT
3 * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
4 * Copyright (c) 2007-2008, Intel Corporation
5 *
6 * This software may be distributed under the terms of the BSD license.
7 * See README for more details.
8 */
9
10 #include "utils/includes.h"
11
12 #include "utils/common.h"
13 #include "utils/eloop.h"
14 #include "common/ieee802_11_defs.h"
15 #include "hostapd.h"
16 #include "ap_config.h"
17 #include "sta_info.h"
18 #include "beacon.h"
19 #include "ieee802_11.h"
20 #include "hw_features.h"
21 #include "ap_drv_ops.h"
22
23
hostapd_eid_ht_capabilities(struct hostapd_data * hapd,u8 * eid)24 u8 * hostapd_eid_ht_capabilities(struct hostapd_data *hapd, u8 *eid)
25 {
26 struct ieee80211_ht_capabilities *cap;
27 u8 *pos = eid;
28
29 if (!hapd->iconf->ieee80211n || !hapd->iface->current_mode ||
30 hapd->conf->disable_11n || is_6ghz_op_class(hapd->iconf->op_class))
31 return eid;
32
33 *pos++ = WLAN_EID_HT_CAP;
34 *pos++ = sizeof(*cap);
35
36 cap = (struct ieee80211_ht_capabilities *) pos;
37 os_memset(cap, 0, sizeof(*cap));
38 cap->ht_capabilities_info = host_to_le16(hapd->iconf->ht_capab);
39 cap->a_mpdu_params = hapd->iface->current_mode->a_mpdu_params;
40 os_memcpy(cap->supported_mcs_set, hapd->iface->current_mode->mcs_set,
41 16);
42
43 /* TODO: ht_extended_capabilities (now fully disabled) */
44 /* TODO: tx_bf_capability_info (now fully disabled) */
45 /* TODO: asel_capabilities (now fully disabled) */
46
47 pos += sizeof(*cap);
48
49 if (hapd->iconf->obss_interval) {
50 struct ieee80211_obss_scan_parameters *scan_params;
51
52 *pos++ = WLAN_EID_OVERLAPPING_BSS_SCAN_PARAMS;
53 *pos++ = sizeof(*scan_params);
54
55 scan_params = (struct ieee80211_obss_scan_parameters *) pos;
56 os_memset(scan_params, 0, sizeof(*scan_params));
57 scan_params->width_trigger_scan_interval =
58 host_to_le16(hapd->iconf->obss_interval);
59
60 /* Fill in default values for remaining parameters
61 * (IEEE Std 802.11-2012, 8.4.2.61 and MIB defval) */
62 scan_params->scan_passive_dwell =
63 host_to_le16(20);
64 scan_params->scan_active_dwell =
65 host_to_le16(10);
66 scan_params->scan_passive_total_per_channel =
67 host_to_le16(200);
68 scan_params->scan_active_total_per_channel =
69 host_to_le16(20);
70 scan_params->channel_transition_delay_factor =
71 host_to_le16(5);
72 scan_params->scan_activity_threshold =
73 host_to_le16(25);
74
75 pos += sizeof(*scan_params);
76 }
77
78 return pos;
79 }
80
81
set_ht_param(struct hostapd_data * hapd,struct ieee80211_ht_operation * oper)82 static void set_ht_param(struct hostapd_data *hapd,
83 struct ieee80211_ht_operation *oper)
84 {
85 int secondary_channel = hapd->iconf->secondary_channel;
86 #ifdef CONFIG_IEEE80211BE
87 enum oper_chan_width chwidth = hostapd_get_oper_chwidth(hapd->iconf);
88 u16 bw = 0, punct_bitmap = hostapd_get_punct_bitmap(hapd);
89 u8 offset, chan_bit_pos;
90
91 switch (chwidth) {
92 case CONF_OPER_CHWIDTH_80MHZ:
93 bw = 80;
94 offset = 6;
95 break;
96 case CONF_OPER_CHWIDTH_160MHZ:
97 bw = 160;
98 offset = 14;
99 break;
100 case CONF_OPER_CHWIDTH_320MHZ:
101 bw = 320;
102 offset = 30;
103 break;
104 default:
105 goto no_update;
106 }
107
108 chan_bit_pos = (hapd->iconf->channel -
109 hostapd_get_oper_centr_freq_seg0_idx(hapd->iconf) +
110 offset) / 4;
111 /* Check if secondary channel is punctured */
112 if (bw >= 80 && punct_bitmap && secondary_channel &&
113 (punct_bitmap & BIT(chan_bit_pos + secondary_channel)))
114 return; /* Do not indicate punctured secondary channel for HT */
115 no_update:
116 #endif /* CONFIG_IEEE80211BE */
117
118 if (secondary_channel == 1)
119 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE |
120 HT_INFO_HT_PARAM_STA_CHNL_WIDTH;
121 if (secondary_channel == -1)
122 oper->ht_param |= HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW |
123 HT_INFO_HT_PARAM_STA_CHNL_WIDTH;
124 }
125
126
hostapd_eid_ht_operation(struct hostapd_data * hapd,u8 * eid)127 u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid)
128 {
129 struct ieee80211_ht_operation *oper;
130 u8 *pos = eid;
131
132 if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n ||
133 is_6ghz_op_class(hapd->iconf->op_class))
134 return eid;
135
136 *pos++ = WLAN_EID_HT_OPERATION;
137 *pos++ = sizeof(*oper);
138
139 oper = (struct ieee80211_ht_operation *) pos;
140 os_memset(oper, 0, sizeof(*oper));
141
142 oper->primary_chan = hapd->iconf->channel;
143 oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode);
144 set_ht_param(hapd, oper);
145
146 pos += sizeof(*oper);
147
148 return pos;
149 }
150
151
152 /*
153 op_mode
154 Set to 0 (HT pure) under the following conditions
155 - all STAs in the BSS are 20/40 MHz HT in 20/40 MHz BSS or
156 - all STAs in the BSS are 20 MHz HT in 20 MHz BSS
157 Set to 1 (HT non-member protection) if there may be non-HT STAs
158 in both the primary and the secondary channel
159 Set to 2 if only HT STAs are associated in BSS,
160 however and at least one 20 MHz HT STA is associated
161 Set to 3 (HT mixed mode) when one or more non-HT STAs are associated
162 */
hostapd_ht_operation_update(struct hostapd_iface * iface)163 int hostapd_ht_operation_update(struct hostapd_iface *iface)
164 {
165 u16 cur_op_mode, new_op_mode;
166 int op_mode_changes = 0;
167
168 if (!iface->conf->ieee80211n || iface->conf->ht_op_mode_fixed)
169 return 0;
170
171 wpa_printf(MSG_DEBUG, "%s current operation mode=0x%X",
172 __func__, iface->ht_op_mode);
173
174 if (!(iface->ht_op_mode & HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT)
175 && iface->num_sta_ht_no_gf) {
176 iface->ht_op_mode |= HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT;
177 op_mode_changes++;
178 } else if ((iface->ht_op_mode &
179 HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT) &&
180 iface->num_sta_ht_no_gf == 0) {
181 iface->ht_op_mode &= ~HT_OPER_OP_MODE_NON_GF_HT_STAS_PRESENT;
182 op_mode_changes++;
183 }
184
185 if (!(iface->ht_op_mode & HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT) &&
186 (iface->num_sta_no_ht || iface->olbc_ht)) {
187 iface->ht_op_mode |= HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT;
188 op_mode_changes++;
189 } else if ((iface->ht_op_mode &
190 HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT) &&
191 (iface->num_sta_no_ht == 0 && !iface->olbc_ht)) {
192 iface->ht_op_mode &= ~HT_OPER_OP_MODE_OBSS_NON_HT_STAS_PRESENT;
193 op_mode_changes++;
194 }
195
196 if (iface->num_sta_no_ht)
197 new_op_mode = HT_PROT_NON_HT_MIXED;
198 else if (iface->conf->secondary_channel && iface->num_sta_ht_20mhz)
199 new_op_mode = HT_PROT_20MHZ_PROTECTION;
200 else if (iface->olbc_ht)
201 new_op_mode = HT_PROT_NONMEMBER_PROTECTION;
202 else
203 new_op_mode = HT_PROT_NO_PROTECTION;
204
205 cur_op_mode = iface->ht_op_mode & HT_OPER_OP_MODE_HT_PROT_MASK;
206 if (cur_op_mode != new_op_mode) {
207 iface->ht_op_mode &= ~HT_OPER_OP_MODE_HT_PROT_MASK;
208 iface->ht_op_mode |= new_op_mode;
209 op_mode_changes++;
210 }
211
212 wpa_printf(MSG_DEBUG, "%s new operation mode=0x%X changes=%d",
213 __func__, iface->ht_op_mode, op_mode_changes);
214
215 return op_mode_changes;
216 }
217
218
is_40_allowed(struct hostapd_iface * iface,int channel)219 static int is_40_allowed(struct hostapd_iface *iface, int channel)
220 {
221 int pri_freq, sec_freq;
222 int affected_start, affected_end;
223 int pri = 2407 + 5 * channel;
224
225 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
226 return 1;
227
228 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
229
230 if (iface->conf->secondary_channel > 0)
231 sec_freq = pri_freq + 20;
232 else
233 sec_freq = pri_freq - 20;
234
235 affected_start = (pri_freq + sec_freq) / 2 - 25;
236 affected_end = (pri_freq + sec_freq) / 2 + 25;
237 if ((pri < affected_start || pri > affected_end))
238 return 1; /* not within affected channel range */
239
240 wpa_printf(MSG_ERROR, "40 MHz affected channel range: [%d,%d] MHz",
241 affected_start, affected_end);
242 wpa_printf(MSG_ERROR, "Neighboring BSS: freq=%d", pri);
243 return 0;
244 }
245
246
hostapd_2040_coex_action(struct hostapd_data * hapd,const struct ieee80211_mgmt * mgmt,size_t len)247 void hostapd_2040_coex_action(struct hostapd_data *hapd,
248 const struct ieee80211_mgmt *mgmt, size_t len)
249 {
250 struct hostapd_iface *iface = hapd->iface;
251 struct ieee80211_2040_bss_coex_ie *bc_ie;
252 struct ieee80211_2040_intol_chan_report *ic_report;
253 int is_ht40_allowed = 1;
254 int i;
255 const u8 *start = (const u8 *) mgmt;
256 const u8 *data = start + IEEE80211_HDRLEN + 2;
257 struct sta_info *sta;
258
259 wpa_printf(MSG_DEBUG,
260 "HT: Received 20/40 BSS Coexistence Management frame from "
261 MACSTR, MAC2STR(mgmt->sa));
262
263 hostapd_logger(hapd, mgmt->sa, HOSTAPD_MODULE_IEEE80211,
264 HOSTAPD_LEVEL_DEBUG, "hostapd_public_action - action=%d",
265 mgmt->u.action.u.public_action.action);
266
267 if (!(iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
268 wpa_printf(MSG_DEBUG,
269 "Ignore 20/40 BSS Coexistence Management frame since 40 MHz capability is not enabled");
270 return;
271 }
272
273 if (len < IEEE80211_HDRLEN + 2 + sizeof(*bc_ie)) {
274 wpa_printf(MSG_DEBUG,
275 "Ignore too short 20/40 BSS Coexistence Management frame");
276 return;
277 }
278
279 /* 20/40 BSS Coexistence element */
280 bc_ie = (struct ieee80211_2040_bss_coex_ie *) data;
281 if (bc_ie->element_id != WLAN_EID_20_40_BSS_COEXISTENCE ||
282 bc_ie->length < 1) {
283 wpa_printf(MSG_DEBUG, "Unexpected IE (%u,%u) in coex report",
284 bc_ie->element_id, bc_ie->length);
285 return;
286 }
287 if (len < IEEE80211_HDRLEN + 2 + 2 + bc_ie->length) {
288 wpa_printf(MSG_DEBUG,
289 "Truncated 20/40 BSS Coexistence element");
290 return;
291 }
292 data += 2 + bc_ie->length;
293
294 wpa_printf(MSG_DEBUG,
295 "20/40 BSS Coexistence Information field: 0x%x (%s%s%s%s%s%s)",
296 bc_ie->coex_param,
297 (bc_ie->coex_param & BIT(0)) ? "[InfoReq]" : "",
298 (bc_ie->coex_param & BIT(1)) ? "[40MHzIntolerant]" : "",
299 (bc_ie->coex_param & BIT(2)) ? "[20MHzBSSWidthReq]" : "",
300 (bc_ie->coex_param & BIT(3)) ? "[OBSSScanExemptionReq]" : "",
301 (bc_ie->coex_param & BIT(4)) ?
302 "[OBSSScanExemptionGrant]" : "",
303 (bc_ie->coex_param & (BIT(5) | BIT(6) | BIT(7))) ?
304 "[Reserved]" : "");
305
306 if (bc_ie->coex_param & WLAN_20_40_BSS_COEX_20MHZ_WIDTH_REQ) {
307 /* Intra-BSS communication prohibiting 20/40 MHz BSS operation
308 */
309 sta = ap_get_sta(hapd, mgmt->sa);
310 if (!sta || !(sta->flags & WLAN_STA_ASSOC)) {
311 wpa_printf(MSG_DEBUG,
312 "Ignore intra-BSS 20/40 BSS Coexistence Management frame from not-associated STA");
313 return;
314 }
315
316 hostapd_logger(hapd, mgmt->sa,
317 HOSTAPD_MODULE_IEEE80211,
318 HOSTAPD_LEVEL_DEBUG,
319 "20 MHz BSS width request bit is set in BSS coexistence information field");
320 is_ht40_allowed = 0;
321 }
322
323 if (bc_ie->coex_param & WLAN_20_40_BSS_COEX_40MHZ_INTOL) {
324 /* Inter-BSS communication prohibiting 20/40 MHz BSS operation
325 */
326 hostapd_logger(hapd, mgmt->sa,
327 HOSTAPD_MODULE_IEEE80211,
328 HOSTAPD_LEVEL_DEBUG,
329 "40 MHz intolerant bit is set in BSS coexistence information field");
330 is_ht40_allowed = 0;
331 }
332
333 /* 20/40 BSS Intolerant Channel Report element (zero or more times) */
334 while (start + len - data >= 3 &&
335 data[0] == WLAN_EID_20_40_BSS_INTOLERANT && data[1] >= 1) {
336 u8 ielen = data[1];
337
338 if (ielen > start + len - data - 2) {
339 wpa_printf(MSG_DEBUG,
340 "Truncated 20/40 BSS Intolerant Channel Report element");
341 return;
342 }
343 ic_report = (struct ieee80211_2040_intol_chan_report *) data;
344 wpa_printf(MSG_DEBUG,
345 "20/40 BSS Intolerant Channel Report: Operating Class %u",
346 ic_report->op_class);
347
348 /* Go through the channel report to find any BSS there in the
349 * affected channel range */
350 for (i = 0; i < ielen - 1; i++) {
351 u8 chan = ic_report->variable[i];
352
353 if (chan == iface->conf->channel)
354 continue; /* matching own primary channel */
355 if (is_40_allowed(iface, chan))
356 continue; /* not within affected channels */
357 hostapd_logger(hapd, mgmt->sa,
358 HOSTAPD_MODULE_IEEE80211,
359 HOSTAPD_LEVEL_DEBUG,
360 "20_40_INTOLERANT channel %d reported",
361 chan);
362 is_ht40_allowed = 0;
363 }
364
365 data += 2 + ielen;
366 }
367 wpa_printf(MSG_DEBUG, "is_ht40_allowed=%d num_sta_ht40_intolerant=%d",
368 is_ht40_allowed, iface->num_sta_ht40_intolerant);
369
370 if (!is_ht40_allowed &&
371 (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
372 if (iface->conf->secondary_channel) {
373 hostapd_logger(hapd, mgmt->sa,
374 HOSTAPD_MODULE_IEEE80211,
375 HOSTAPD_LEVEL_INFO,
376 "Switching to 20 MHz operation");
377 iface->conf->secondary_channel = 0;
378 ieee802_11_set_beacons(iface);
379 }
380 if (!iface->num_sta_ht40_intolerant &&
381 iface->conf->obss_interval) {
382 unsigned int delay_time;
383 delay_time = OVERLAPPING_BSS_TRANS_DELAY_FACTOR *
384 iface->conf->obss_interval;
385 eloop_cancel_timeout(ap_ht2040_timeout, hapd->iface,
386 NULL);
387 eloop_register_timeout(delay_time, 0, ap_ht2040_timeout,
388 hapd->iface, NULL);
389 wpa_printf(MSG_DEBUG,
390 "Reschedule HT 20/40 timeout to occur in %u seconds",
391 delay_time);
392 }
393 }
394 }
395
396
copy_sta_ht_capab(struct hostapd_data * hapd,struct sta_info * sta,const u8 * ht_capab)397 u16 copy_sta_ht_capab(struct hostapd_data *hapd, struct sta_info *sta,
398 const u8 *ht_capab)
399 {
400 /*
401 * Disable HT caps for STAs associated to no-HT BSSes, or for stations
402 * that did not specify a valid WMM IE in the (Re)Association Request
403 * frame.
404 */
405 if (!ht_capab || !(sta->flags & WLAN_STA_WMM) ||
406 !hapd->iconf->ieee80211n || hapd->conf->disable_11n) {
407 sta->flags &= ~WLAN_STA_HT;
408 os_free(sta->ht_capabilities);
409 sta->ht_capabilities = NULL;
410 return WLAN_STATUS_SUCCESS;
411 }
412
413 if (sta->ht_capabilities == NULL) {
414 sta->ht_capabilities =
415 os_zalloc(sizeof(struct ieee80211_ht_capabilities));
416 if (sta->ht_capabilities == NULL)
417 return WLAN_STATUS_UNSPECIFIED_FAILURE;
418 }
419
420 sta->flags |= WLAN_STA_HT;
421 os_memcpy(sta->ht_capabilities, ht_capab,
422 sizeof(struct ieee80211_ht_capabilities));
423
424 return WLAN_STATUS_SUCCESS;
425 }
426
427
ht40_intolerant_add(struct hostapd_iface * iface,struct sta_info * sta)428 void ht40_intolerant_add(struct hostapd_iface *iface, struct sta_info *sta)
429 {
430 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G)
431 return;
432
433 wpa_printf(MSG_INFO, "HT: Forty MHz Intolerant is set by STA " MACSTR
434 " in Association Request", MAC2STR(sta->addr));
435
436 if (sta->ht40_intolerant_set)
437 return;
438
439 sta->ht40_intolerant_set = 1;
440 iface->num_sta_ht40_intolerant++;
441 eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL);
442
443 if (iface->conf->secondary_channel &&
444 (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
445 iface->conf->secondary_channel = 0;
446 ieee802_11_set_beacons(iface);
447 }
448 }
449
450
ht40_intolerant_remove(struct hostapd_iface * iface,struct sta_info * sta)451 void ht40_intolerant_remove(struct hostapd_iface *iface, struct sta_info *sta)
452 {
453 if (!sta->ht40_intolerant_set)
454 return;
455
456 sta->ht40_intolerant_set = 0;
457 iface->num_sta_ht40_intolerant--;
458
459 if (iface->num_sta_ht40_intolerant == 0 &&
460 iface->conf->obss_interval &&
461 (iface->conf->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
462 (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX)) {
463 unsigned int delay_time = OVERLAPPING_BSS_TRANS_DELAY_FACTOR *
464 iface->conf->obss_interval;
465 wpa_printf(MSG_DEBUG,
466 "HT: Start 20->40 MHz transition timer (%d seconds)",
467 delay_time);
468 eloop_cancel_timeout(ap_ht2040_timeout, iface, NULL);
469 eloop_register_timeout(delay_time, 0, ap_ht2040_timeout,
470 iface, NULL);
471 }
472 }
473
474
update_sta_ht(struct hostapd_data * hapd,struct sta_info * sta)475 static void update_sta_ht(struct hostapd_data *hapd, struct sta_info *sta)
476 {
477 u16 ht_capab;
478
479 ht_capab = le_to_host16(sta->ht_capabilities->ht_capabilities_info);
480 wpa_printf(MSG_DEBUG, "HT: STA " MACSTR " HT Capabilities Info: "
481 "0x%04x", MAC2STR(sta->addr), ht_capab);
482 if ((ht_capab & HT_CAP_INFO_GREEN_FIELD) == 0) {
483 if (!sta->no_ht_gf_set) {
484 sta->no_ht_gf_set = 1;
485 hapd->iface->num_sta_ht_no_gf++;
486 }
487 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no greenfield, num "
488 "of non-gf stations %d",
489 __func__, MAC2STR(sta->addr),
490 hapd->iface->num_sta_ht_no_gf);
491 }
492 if ((ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) == 0) {
493 if (!sta->ht_20mhz_set) {
494 sta->ht_20mhz_set = 1;
495 hapd->iface->num_sta_ht_20mhz++;
496 }
497 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - 20 MHz HT, num of "
498 "20MHz HT STAs %d",
499 __func__, MAC2STR(sta->addr),
500 hapd->iface->num_sta_ht_20mhz);
501 }
502
503 if (ht_capab & HT_CAP_INFO_40MHZ_INTOLERANT)
504 ht40_intolerant_add(hapd->iface, sta);
505 }
506
507
update_sta_no_ht(struct hostapd_data * hapd,struct sta_info * sta)508 static void update_sta_no_ht(struct hostapd_data *hapd, struct sta_info *sta)
509 {
510 if (!sta->no_ht_set) {
511 sta->no_ht_set = 1;
512 hapd->iface->num_sta_no_ht++;
513 }
514 if (hapd->iconf->ieee80211n) {
515 wpa_printf(MSG_DEBUG, "%s STA " MACSTR " - no HT, num of "
516 "non-HT stations %d",
517 __func__, MAC2STR(sta->addr),
518 hapd->iface->num_sta_no_ht);
519 }
520 }
521
522
update_ht_state(struct hostapd_data * hapd,struct sta_info * sta)523 int update_ht_state(struct hostapd_data *hapd, struct sta_info *sta)
524 {
525 if ((sta->flags & WLAN_STA_HT) && sta->ht_capabilities)
526 update_sta_ht(hapd, sta);
527 else
528 update_sta_no_ht(hapd, sta);
529
530 return hostapd_ht_operation_update(hapd->iface);
531 }
532
533
hostapd_get_ht_capab(struct hostapd_data * hapd,struct ieee80211_ht_capabilities * ht_cap,struct ieee80211_ht_capabilities * neg_ht_cap)534 void hostapd_get_ht_capab(struct hostapd_data *hapd,
535 struct ieee80211_ht_capabilities *ht_cap,
536 struct ieee80211_ht_capabilities *neg_ht_cap)
537 {
538 u16 cap;
539
540 if (ht_cap == NULL)
541 return;
542 os_memcpy(neg_ht_cap, ht_cap, sizeof(*neg_ht_cap));
543 cap = le_to_host16(neg_ht_cap->ht_capabilities_info);
544
545 /*
546 * Mask out HT features we don't support, but don't overwrite
547 * non-symmetric features like STBC and SMPS. Just because
548 * we're not in dynamic SMPS mode the STA might still be.
549 */
550 cap &= (hapd->iconf->ht_capab | HT_CAP_INFO_RX_STBC_MASK |
551 HT_CAP_INFO_TX_STBC | HT_CAP_INFO_SMPS_MASK);
552
553 /*
554 * STBC needs to be handled specially
555 * if we don't support RX STBC, mask out TX STBC in the STA's HT caps
556 * if we don't support TX STBC, mask out RX STBC in the STA's HT caps
557 */
558 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_RX_STBC_MASK))
559 cap &= ~HT_CAP_INFO_TX_STBC;
560 if (!(hapd->iconf->ht_capab & HT_CAP_INFO_TX_STBC))
561 cap &= ~HT_CAP_INFO_RX_STBC_MASK;
562
563 neg_ht_cap->ht_capabilities_info = host_to_le16(cap);
564 }
565
566
ap_ht2040_timeout(void * eloop_data,void * user_data)567 void ap_ht2040_timeout(void *eloop_data, void *user_data)
568 {
569 struct hostapd_iface *iface = eloop_data;
570
571 wpa_printf(MSG_INFO, "Switching to 40 MHz operation");
572
573 iface->conf->secondary_channel = iface->secondary_ch;
574 ieee802_11_set_beacons(iface);
575 }
576