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