1 /*
2 * hostapd / Hardware feature query and different modes
3 * Copyright 2002-2003, Instant802 Networks, Inc.
4 * Copyright 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 #include "utils/common.h"
14 #include "utils/eloop.h"
15 #include "common/ieee802_11_defs.h"
16 #include "common/ieee802_11_common.h"
17 #include "common/wpa_ctrl.h"
18 #include "common/hw_features_common.h"
19 #include "hostapd.h"
20 #include "ap_config.h"
21 #include "ap_drv_ops.h"
22 #include "acs.h"
23 #include "ieee802_11.h"
24 #include "beacon.h"
25 #include "hw_features.h"
26
27
hostapd_free_hw_features(struct hostapd_hw_modes * hw_features,size_t num_hw_features)28 void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
29 size_t num_hw_features)
30 {
31 size_t i;
32
33 if (hw_features == NULL)
34 return;
35
36 for (i = 0; i < num_hw_features; i++) {
37 os_free(hw_features[i].channels);
38 os_free(hw_features[i].rates);
39 }
40
41 os_free(hw_features);
42 }
43
44
45 #ifndef CONFIG_NO_STDOUT_DEBUG
dfs_info(struct hostapd_channel_data * chan)46 static char * dfs_info(struct hostapd_channel_data *chan)
47 {
48 static char info[256];
49 char *state;
50
51 switch (chan->flag & HOSTAPD_CHAN_DFS_MASK) {
52 case HOSTAPD_CHAN_DFS_UNKNOWN:
53 state = "unknown";
54 break;
55 case HOSTAPD_CHAN_DFS_USABLE:
56 state = "usable";
57 break;
58 case HOSTAPD_CHAN_DFS_UNAVAILABLE:
59 state = "unavailable";
60 break;
61 case HOSTAPD_CHAN_DFS_AVAILABLE:
62 state = "available";
63 break;
64 default:
65 return "";
66 }
67 os_snprintf(info, sizeof(info), " (DFS state = %s)", state);
68 info[sizeof(info) - 1] = '\0';
69
70 return info;
71 }
72 #endif /* CONFIG_NO_STDOUT_DEBUG */
73
74
hostapd_get_hw_features(struct hostapd_iface * iface)75 int hostapd_get_hw_features(struct hostapd_iface *iface)
76 {
77 struct hostapd_data *hapd = iface->bss[0];
78 int i, j;
79 u16 num_modes, flags;
80 struct hostapd_hw_modes *modes;
81 u8 dfs_domain;
82
83 if (hostapd_drv_none(hapd))
84 return -1;
85 modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags,
86 &dfs_domain);
87 if (modes == NULL) {
88 hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
89 HOSTAPD_LEVEL_DEBUG,
90 "Fetching hardware channel/rate support not "
91 "supported.");
92 return -1;
93 }
94
95 iface->hw_flags = flags;
96 iface->dfs_domain = dfs_domain;
97
98 hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
99 iface->hw_features = modes;
100 iface->num_hw_features = num_modes;
101
102 for (i = 0; i < num_modes; i++) {
103 struct hostapd_hw_modes *feature = &modes[i];
104 int dfs_enabled = hapd->iconf->ieee80211h &&
105 (iface->drv_flags & WPA_DRIVER_FLAGS_RADAR);
106
107 /* set flag for channels we can use in current regulatory
108 * domain */
109 for (j = 0; j < feature->num_channels; j++) {
110 int dfs = 0;
111
112 /*
113 * Disable all channels that are marked not to allow
114 * to initiate radiation (a.k.a. passive scan and no
115 * IBSS).
116 * Use radar channels only if the driver supports DFS.
117 */
118 if ((feature->channels[j].flag &
119 HOSTAPD_CHAN_RADAR) && dfs_enabled) {
120 dfs = 1;
121 } else if (((feature->channels[j].flag &
122 HOSTAPD_CHAN_RADAR) &&
123 !(iface->drv_flags &
124 WPA_DRIVER_FLAGS_DFS_OFFLOAD)) ||
125 (feature->channels[j].flag &
126 HOSTAPD_CHAN_NO_IR)) {
127 feature->channels[j].flag |=
128 HOSTAPD_CHAN_DISABLED;
129 }
130
131 if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
132 continue;
133
134 wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
135 "chan=%d freq=%d MHz max_tx_power=%d dBm%s",
136 feature->mode,
137 feature->channels[j].chan,
138 feature->channels[j].freq,
139 feature->channels[j].max_tx_power,
140 dfs ? dfs_info(&feature->channels[j]) : "");
141 }
142 }
143
144 return 0;
145 }
146
147
hostapd_prepare_rates(struct hostapd_iface * iface,struct hostapd_hw_modes * mode)148 int hostapd_prepare_rates(struct hostapd_iface *iface,
149 struct hostapd_hw_modes *mode)
150 {
151 int i, num_basic_rates = 0;
152 int basic_rates_a[] = { 60, 120, 240, -1 };
153 int basic_rates_b[] = { 10, 20, -1 };
154 int basic_rates_g[] = { 10, 20, 55, 110, -1 };
155 int *basic_rates;
156
157 if (iface->conf->basic_rates)
158 basic_rates = iface->conf->basic_rates;
159 else switch (mode->mode) {
160 case HOSTAPD_MODE_IEEE80211A:
161 basic_rates = basic_rates_a;
162 break;
163 case HOSTAPD_MODE_IEEE80211B:
164 basic_rates = basic_rates_b;
165 break;
166 case HOSTAPD_MODE_IEEE80211G:
167 basic_rates = basic_rates_g;
168 break;
169 case HOSTAPD_MODE_IEEE80211AD:
170 return 0; /* No basic rates for 11ad */
171 default:
172 return -1;
173 }
174
175 i = 0;
176 while (basic_rates[i] >= 0)
177 i++;
178 if (i)
179 i++; /* -1 termination */
180 os_free(iface->basic_rates);
181 iface->basic_rates = os_malloc(i * sizeof(int));
182 if (iface->basic_rates)
183 os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int));
184
185 os_free(iface->current_rates);
186 iface->num_rates = 0;
187
188 iface->current_rates =
189 os_calloc(mode->num_rates, sizeof(struct hostapd_rate_data));
190 if (!iface->current_rates) {
191 wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
192 "table.");
193 return -1;
194 }
195
196 for (i = 0; i < mode->num_rates; i++) {
197 struct hostapd_rate_data *rate;
198
199 if (iface->conf->supported_rates &&
200 !hostapd_rate_found(iface->conf->supported_rates,
201 mode->rates[i]))
202 continue;
203
204 rate = &iface->current_rates[iface->num_rates];
205 rate->rate = mode->rates[i];
206 if (hostapd_rate_found(basic_rates, rate->rate)) {
207 rate->flags |= HOSTAPD_RATE_BASIC;
208 num_basic_rates++;
209 }
210 wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
211 iface->num_rates, rate->rate, rate->flags);
212 iface->num_rates++;
213 }
214
215 if ((iface->num_rates == 0 || num_basic_rates == 0) &&
216 (!iface->conf->ieee80211n || !iface->conf->require_ht)) {
217 wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
218 "rate sets (%d,%d).",
219 iface->num_rates, num_basic_rates);
220 return -1;
221 }
222
223 return 0;
224 }
225
226
ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface * iface)227 static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
228 {
229 int pri_freq, sec_freq;
230 struct hostapd_channel_data *p_chan, *s_chan;
231
232 #ifdef CONFIG_OHOS_P2P
233 if (!iface->conf->secondary_channel) {
234 return 1; // HT40 not used.
235 }
236 #endif
237 pri_freq = iface->freq;
238 sec_freq = pri_freq + iface->conf->secondary_channel * 20;
239
240 if (!iface->current_mode)
241 return 0;
242
243 p_chan = hw_get_channel_freq(iface->current_mode->mode, pri_freq, NULL,
244 iface->hw_features,
245 iface->num_hw_features);
246
247 s_chan = hw_get_channel_freq(iface->current_mode->mode, sec_freq, NULL,
248 iface->hw_features,
249 iface->num_hw_features);
250
251 return allowed_ht40_channel_pair(iface->current_mode->mode,
252 p_chan, s_chan);
253 }
254
255
ieee80211n_switch_pri_sec(struct hostapd_iface * iface)256 static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
257 {
258 if (iface->conf->secondary_channel > 0) {
259 iface->conf->channel += 4;
260 iface->freq += 20;
261 iface->conf->secondary_channel = -1;
262 } else {
263 iface->conf->channel -= 4;
264 iface->freq -= 20;
265 iface->conf->secondary_channel = 1;
266 }
267 }
268
269
ieee80211n_check_40mhz_5g(struct hostapd_iface * iface,struct wpa_scan_results * scan_res)270 static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
271 struct wpa_scan_results *scan_res)
272 {
273 unsigned int pri_freq, sec_freq;
274 int res;
275 struct hostapd_channel_data *pri_chan, *sec_chan;
276
277 pri_freq = iface->freq;
278 sec_freq = pri_freq + iface->conf->secondary_channel * 20;
279
280 if (!iface->current_mode)
281 return 0;
282 pri_chan = hw_get_channel_freq(iface->current_mode->mode, pri_freq,
283 NULL, iface->hw_features,
284 iface->num_hw_features);
285 sec_chan = hw_get_channel_freq(iface->current_mode->mode, sec_freq,
286 NULL, iface->hw_features,
287 iface->num_hw_features);
288
289 res = check_40mhz_5g(scan_res, pri_chan, sec_chan);
290
291 if (res == 2) {
292 if (iface->conf->no_pri_sec_switch) {
293 wpa_printf(MSG_DEBUG,
294 "Cannot switch PRI/SEC channels due to local constraint");
295 } else {
296 ieee80211n_switch_pri_sec(iface);
297 }
298 }
299
300 return !!res;
301 }
302
303
ieee80211n_check_40mhz_2g4(struct hostapd_iface * iface,struct wpa_scan_results * scan_res)304 static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
305 struct wpa_scan_results *scan_res)
306 {
307 int pri_chan, sec_chan;
308
309 pri_chan = iface->conf->channel;
310 sec_chan = pri_chan + iface->conf->secondary_channel * 4;
311
312 return check_40mhz_2g4(iface->current_mode, scan_res, pri_chan,
313 sec_chan);
314 }
315
316
ieee80211n_check_scan(struct hostapd_iface * iface)317 static void ieee80211n_check_scan(struct hostapd_iface *iface)
318 {
319 struct wpa_scan_results *scan_res;
320 int oper40;
321 int res = 0;
322
323 /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
324 * allowed per IEEE Std 802.11-2012, 10.15.3.2 */
325
326 iface->scan_cb = NULL;
327
328 scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
329 if (scan_res == NULL) {
330 hostapd_setup_interface_complete(iface, 1);
331 return;
332 }
333
334 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
335 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
336 else
337 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
338 wpa_scan_results_free(scan_res);
339
340 iface->secondary_ch = iface->conf->secondary_channel;
341 if (!oper40) {
342 wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
343 "channel pri=%d sec=%d based on overlapping BSSes",
344 iface->conf->channel,
345 iface->conf->channel +
346 iface->conf->secondary_channel * 4);
347 iface->conf->secondary_channel = 0;
348 if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) {
349 /*
350 * TODO: Could consider scheduling another scan to check
351 * if channel width can be changed if no coex reports
352 * are received from associating stations.
353 */
354 }
355 }
356
357 #ifdef CONFIG_IEEE80211AX
358 if (iface->conf->secondary_channel &&
359 iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G &&
360 iface->conf->ieee80211ax) {
361 struct he_capabilities *he_cap;
362
363 he_cap = &iface->current_mode->he_capab[IEEE80211_MODE_AP];
364 if (!(he_cap->phy_cap[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &
365 HE_PHYCAP_CHANNEL_WIDTH_SET_40MHZ_IN_2G)) {
366 wpa_printf(MSG_DEBUG,
367 "HE: 40 MHz channel width is not supported in 2.4 GHz; clear secondary channel configuration");
368 iface->conf->secondary_channel = 0;
369 }
370 }
371 #endif /* CONFIG_IEEE80211AX */
372
373 if (iface->conf->secondary_channel)
374 res = ieee80211n_allowed_ht40_channel_pair(iface);
375 if (!res) {
376 iface->conf->secondary_channel = 0;
377 hostapd_set_oper_centr_freq_seg0_idx(iface->conf, 0);
378 hostapd_set_oper_centr_freq_seg1_idx(iface->conf, 0);
379 hostapd_set_oper_chwidth(iface->conf, CHANWIDTH_USE_HT);
380 res = 1;
381 wpa_printf(MSG_INFO, "Fallback to 20 MHz");
382 }
383
384 hostapd_setup_interface_complete(iface, !res);
385 }
386
387
ieee80211n_scan_channels_2g4(struct hostapd_iface * iface,struct wpa_driver_scan_params * params)388 static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface,
389 struct wpa_driver_scan_params *params)
390 {
391 /* Scan only the affected frequency range */
392 int pri_freq, sec_freq;
393 int affected_start, affected_end;
394 int i, pos;
395 struct hostapd_hw_modes *mode;
396
397 if (iface->current_mode == NULL)
398 return;
399
400 pri_freq = iface->freq;
401 if (iface->conf->secondary_channel > 0)
402 sec_freq = pri_freq + 20;
403 else
404 sec_freq = pri_freq - 20;
405 /*
406 * Note: Need to find the PRI channel also in cases where the affected
407 * channel is the SEC channel of a 40 MHz BSS, so need to include the
408 * scanning coverage here to be 40 MHz from the center frequency.
409 */
410 affected_start = (pri_freq + sec_freq) / 2 - 40;
411 affected_end = (pri_freq + sec_freq) / 2 + 40;
412 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
413 affected_start, affected_end);
414
415 mode = iface->current_mode;
416 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
417 if (params->freqs == NULL)
418 return;
419 pos = 0;
420
421 for (i = 0; i < mode->num_channels; i++) {
422 struct hostapd_channel_data *chan = &mode->channels[i];
423 if (chan->flag & HOSTAPD_CHAN_DISABLED)
424 continue;
425 if (chan->freq < affected_start ||
426 chan->freq > affected_end)
427 continue;
428 params->freqs[pos++] = chan->freq;
429 }
430 }
431
432
ieee80211n_scan_channels_5g(struct hostapd_iface * iface,struct wpa_driver_scan_params * params)433 static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface,
434 struct wpa_driver_scan_params *params)
435 {
436 /* Scan only the affected frequency range */
437 int pri_freq;
438 int affected_start, affected_end;
439 int i, pos;
440 struct hostapd_hw_modes *mode;
441
442 if (iface->current_mode == NULL)
443 return;
444
445 pri_freq = iface->freq;
446 if (iface->conf->secondary_channel > 0) {
447 affected_start = pri_freq - 10;
448 affected_end = pri_freq + 30;
449 } else {
450 affected_start = pri_freq - 30;
451 affected_end = pri_freq + 10;
452 }
453 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
454 affected_start, affected_end);
455
456 mode = iface->current_mode;
457 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
458 if (params->freqs == NULL)
459 return;
460 pos = 0;
461
462 for (i = 0; i < mode->num_channels; i++) {
463 struct hostapd_channel_data *chan = &mode->channels[i];
464 if (chan->flag & HOSTAPD_CHAN_DISABLED)
465 continue;
466 if (chan->freq < affected_start ||
467 chan->freq > affected_end)
468 continue;
469 params->freqs[pos++] = chan->freq;
470 }
471 }
472
473
ap_ht40_scan_retry(void * eloop_data,void * user_data)474 static void ap_ht40_scan_retry(void *eloop_data, void *user_data)
475 {
476 #define HT2040_COEX_SCAN_RETRY 15
477 struct hostapd_iface *iface = eloop_data;
478 struct wpa_driver_scan_params params;
479 int ret;
480
481 os_memset(¶ms, 0, sizeof(params));
482 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
483 ieee80211n_scan_channels_2g4(iface, ¶ms);
484 else
485 ieee80211n_scan_channels_5g(iface, ¶ms);
486
487 ret = hostapd_driver_scan(iface->bss[0], ¶ms);
488 iface->num_ht40_scan_tries++;
489 os_free(params.freqs);
490
491 if (ret == -EBUSY &&
492 iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) {
493 wpa_printf(MSG_ERROR,
494 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)",
495 ret, strerror(-ret), iface->num_ht40_scan_tries);
496 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
497 return;
498 }
499
500 if (ret == 0) {
501 iface->scan_cb = ieee80211n_check_scan;
502 return;
503 }
504
505 wpa_printf(MSG_DEBUG,
506 "Failed to request a scan in device, bringing up in HT20 mode");
507 iface->conf->secondary_channel = 0;
508 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
509 hostapd_setup_interface_complete(iface, 0);
510 }
511
512
hostapd_stop_setup_timers(struct hostapd_iface * iface)513 void hostapd_stop_setup_timers(struct hostapd_iface *iface)
514 {
515 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
516 }
517
518
ieee80211n_check_40mhz(struct hostapd_iface * iface)519 static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
520 {
521 struct wpa_driver_scan_params params;
522 int ret;
523
524 /* Check that HT40 is used and PRI / SEC switch is allowed */
525 if (!iface->conf->secondary_channel || iface->conf->no_pri_sec_switch)
526 return 0;
527
528 hostapd_set_state(iface, HAPD_IFACE_HT_SCAN);
529 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
530 "40 MHz channel");
531 os_memset(¶ms, 0, sizeof(params));
532 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
533 ieee80211n_scan_channels_2g4(iface, ¶ms);
534 else
535 ieee80211n_scan_channels_5g(iface, ¶ms);
536
537 ret = hostapd_driver_scan(iface->bss[0], ¶ms);
538 os_free(params.freqs);
539
540 if (ret == -EBUSY) {
541 wpa_printf(MSG_ERROR,
542 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again",
543 ret, strerror(-ret));
544 iface->num_ht40_scan_tries = 1;
545 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
546 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
547 return 1;
548 }
549
550 if (ret < 0) {
551 wpa_printf(MSG_ERROR,
552 "Failed to request a scan of neighboring BSSes ret=%d (%s)",
553 ret, strerror(-ret));
554 return -1;
555 }
556
557 iface->scan_cb = ieee80211n_check_scan;
558 return 1;
559 }
560
561
ieee80211n_supported_ht_capab(struct hostapd_iface * iface)562 static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
563 {
564 u16 hw = iface->current_mode->ht_capab;
565 u16 conf = iface->conf->ht_capab;
566
567 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
568 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
569 wpa_printf(MSG_ERROR, "Driver does not support configured "
570 "HT capability [LDPC]");
571 return 0;
572 }
573
574 /*
575 * Driver ACS chosen channel may not be HT40 due to internal driver
576 * restrictions.
577 */
578 if (!iface->conf->acs && (conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
579 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
580 wpa_printf(MSG_ERROR, "Driver does not support configured "
581 "HT capability [HT40*]");
582 return 0;
583 }
584
585 if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
586 !(hw & HT_CAP_INFO_GREEN_FIELD)) {
587 wpa_printf(MSG_ERROR, "Driver does not support configured "
588 "HT capability [GF]");
589 return 0;
590 }
591
592 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
593 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
594 wpa_printf(MSG_ERROR, "Driver does not support configured "
595 "HT capability [SHORT-GI-20]");
596 return 0;
597 }
598
599 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
600 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
601 wpa_printf(MSG_ERROR, "Driver does not support configured "
602 "HT capability [SHORT-GI-40]");
603 return 0;
604 }
605
606 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
607 wpa_printf(MSG_ERROR, "Driver does not support configured "
608 "HT capability [TX-STBC]");
609 return 0;
610 }
611
612 if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
613 (hw & HT_CAP_INFO_RX_STBC_MASK)) {
614 wpa_printf(MSG_ERROR, "Driver does not support configured "
615 "HT capability [RX-STBC*]");
616 return 0;
617 }
618
619 if ((conf & HT_CAP_INFO_DELAYED_BA) &&
620 !(hw & HT_CAP_INFO_DELAYED_BA)) {
621 wpa_printf(MSG_ERROR, "Driver does not support configured "
622 "HT capability [DELAYED-BA]");
623 return 0;
624 }
625
626 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
627 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
628 wpa_printf(MSG_ERROR, "Driver does not support configured "
629 "HT capability [MAX-AMSDU-7935]");
630 return 0;
631 }
632
633 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
634 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
635 wpa_printf(MSG_ERROR, "Driver does not support configured "
636 "HT capability [DSSS_CCK-40]");
637 return 0;
638 }
639
640 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
641 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
642 wpa_printf(MSG_ERROR, "Driver does not support configured "
643 "HT capability [LSIG-TXOP-PROT]");
644 return 0;
645 }
646
647 return 1;
648 }
649
650
651 #ifdef CONFIG_IEEE80211AC
ieee80211ac_supported_vht_capab(struct hostapd_iface * iface)652 static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface)
653 {
654 struct hostapd_hw_modes *mode = iface->current_mode;
655 u32 hw = mode->vht_capab;
656 u32 conf = iface->conf->vht_capab;
657
658 wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x",
659 hw, conf);
660
661 if (mode->mode == HOSTAPD_MODE_IEEE80211G &&
662 iface->conf->bss[0]->vendor_vht &&
663 mode->vht_capab == 0 && iface->hw_features) {
664 int i;
665
666 for (i = 0; i < iface->num_hw_features; i++) {
667 if (iface->hw_features[i].mode ==
668 HOSTAPD_MODE_IEEE80211A) {
669 mode = &iface->hw_features[i];
670 hw = mode->vht_capab;
671 wpa_printf(MSG_DEBUG,
672 "update hw vht capab based on 5 GHz band: 0x%x",
673 hw);
674 break;
675 }
676 }
677 }
678
679 return ieee80211ac_cap_check(hw, conf);
680 }
681 #endif /* CONFIG_IEEE80211AC */
682
683
684 #ifdef CONFIG_IEEE80211AX
ieee80211ax_supported_he_capab(struct hostapd_iface * iface)685 static int ieee80211ax_supported_he_capab(struct hostapd_iface *iface)
686 {
687 return 1;
688 }
689 #endif /* CONFIG_IEEE80211AX */
690
691
hostapd_check_ht_capab(struct hostapd_iface * iface)692 int hostapd_check_ht_capab(struct hostapd_iface *iface)
693 {
694 int ret;
695
696 if (is_6ghz_freq(iface->freq))
697 return 0;
698 if (!iface->conf->ieee80211n)
699 return 0;
700
701 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211B &&
702 iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G &&
703 (iface->conf->ht_capab & HT_CAP_INFO_DSSS_CCK40MHZ)) {
704 wpa_printf(MSG_DEBUG,
705 "Disable HT capability [DSSS_CCK-40] on 5 GHz band");
706 iface->conf->ht_capab &= ~HT_CAP_INFO_DSSS_CCK40MHZ;
707 }
708
709 if (!ieee80211n_supported_ht_capab(iface))
710 return -1;
711 #ifdef CONFIG_IEEE80211AX
712 if (iface->conf->ieee80211ax &&
713 !ieee80211ax_supported_he_capab(iface))
714 return -1;
715 #endif /* CONFIG_IEEE80211AX */
716 #ifdef CONFIG_IEEE80211AC
717 if (iface->conf->ieee80211ac &&
718 !ieee80211ac_supported_vht_capab(iface))
719 return -1;
720 #endif /* CONFIG_IEEE80211AC */
721 ret = ieee80211n_check_40mhz(iface);
722 if (ret)
723 return ret;
724 if (!ieee80211n_allowed_ht40_channel_pair(iface))
725 return -1;
726
727 return 0;
728 }
729
730
hostapd_check_edmg_capab(struct hostapd_iface * iface)731 int hostapd_check_edmg_capab(struct hostapd_iface *iface)
732 {
733 struct hostapd_hw_modes *mode = iface->hw_features;
734 struct ieee80211_edmg_config edmg;
735
736 if (!iface->conf->enable_edmg)
737 return 0;
738
739 hostapd_encode_edmg_chan(iface->conf->enable_edmg,
740 iface->conf->edmg_channel,
741 iface->conf->channel,
742 &edmg);
743
744 if (mode->edmg.channels && ieee802_edmg_is_allowed(mode->edmg, edmg))
745 return 0;
746
747 wpa_printf(MSG_WARNING, "Requested EDMG configuration is not valid");
748 wpa_printf(MSG_INFO, "EDMG capab: channels 0x%x, bw_config %d",
749 mode->edmg.channels, mode->edmg.bw_config);
750 wpa_printf(MSG_INFO,
751 "Requested EDMG configuration: channels 0x%x, bw_config %d",
752 edmg.channels, edmg.bw_config);
753 return -1;
754 }
755
756
hostapd_check_he_6ghz_capab(struct hostapd_iface * iface)757 int hostapd_check_he_6ghz_capab(struct hostapd_iface *iface)
758 {
759 #ifdef CONFIG_IEEE80211AX
760 struct he_capabilities *he_cap;
761 u16 hw;
762
763 if (!iface->current_mode || !is_6ghz_freq(iface->freq))
764 return 0;
765
766 he_cap = &iface->current_mode->he_capab[IEEE80211_MODE_AP];
767 hw = he_cap->he_6ghz_capa;
768 if (iface->conf->he_6ghz_max_mpdu >
769 ((hw & HE_6GHZ_BAND_CAP_MAX_MPDU_LEN_MASK) >>
770 HE_6GHZ_BAND_CAP_MAX_MPDU_LEN_SHIFT)) {
771 wpa_printf(MSG_ERROR,
772 "The driver does not support the configured HE 6 GHz Max MPDU length");
773 return -1;
774 }
775
776 if (iface->conf->he_6ghz_max_ampdu_len_exp >
777 ((hw & HE_6GHZ_BAND_CAP_MAX_AMPDU_LEN_EXP_MASK) >>
778 HE_6GHZ_BAND_CAP_MAX_AMPDU_LEN_EXP_SHIFT)) {
779 wpa_printf(MSG_ERROR,
780 "The driver does not support the configured HE 6 GHz Max AMPDU Length Exponent");
781 return -1;
782 }
783
784 if (iface->conf->he_6ghz_rx_ant_pat &&
785 !(hw & HE_6GHZ_BAND_CAP_RX_ANTPAT_CONS)) {
786 wpa_printf(MSG_ERROR,
787 "The driver does not support the configured HE 6 GHz Rx Antenna Pattern");
788 return -1;
789 }
790
791 if (iface->conf->he_6ghz_tx_ant_pat &&
792 !(hw & HE_6GHZ_BAND_CAP_TX_ANTPAT_CONS)) {
793 wpa_printf(MSG_ERROR,
794 "The driver does not support the configured HE 6 GHz Tx Antenna Pattern");
795 return -1;
796 }
797 #endif /* CONFIG_IEEE80211AX */
798 return 0;
799 }
800
801
hostapd_is_usable_chan(struct hostapd_iface * iface,int frequency,int primary)802 static int hostapd_is_usable_chan(struct hostapd_iface *iface,
803 int frequency, int primary)
804 {
805 struct hostapd_channel_data *chan;
806
807 if (!iface->current_mode)
808 return 0;
809
810 chan = hw_get_channel_freq(iface->current_mode->mode, frequency, NULL,
811 iface->hw_features, iface->num_hw_features);
812 if (!chan)
813 return 0;
814
815 if (!(chan->flag & HOSTAPD_CHAN_DISABLED))
816 return 1;
817
818 wpa_printf(MSG_INFO,
819 "Frequency %d (%s) not allowed for AP mode, flags: 0x%x%s%s",
820 frequency, primary ? "primary" : "secondary",
821 chan->flag,
822 chan->flag & HOSTAPD_CHAN_NO_IR ? " NO-IR" : "",
823 chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : "");
824 return 0;
825 }
826
827
hostapd_is_usable_edmg(struct hostapd_iface * iface)828 static int hostapd_is_usable_edmg(struct hostapd_iface *iface)
829 {
830 int i, contiguous = 0;
831 int num_of_enabled = 0;
832 int max_contiguous = 0;
833 struct ieee80211_edmg_config edmg;
834 struct hostapd_channel_data *pri_chan;
835
836 if (!iface->conf->enable_edmg)
837 return 1;
838
839 if (!iface->current_mode)
840 return 0;
841 pri_chan = hw_get_channel_freq(iface->current_mode->mode,
842 iface->freq, NULL,
843 iface->hw_features,
844 iface->num_hw_features);
845 if (!pri_chan)
846 return 0;
847 hostapd_encode_edmg_chan(iface->conf->enable_edmg,
848 iface->conf->edmg_channel,
849 pri_chan->chan,
850 &edmg);
851 if (!(edmg.channels & BIT(pri_chan->chan - 1)))
852 return 0;
853
854 /* 60 GHz channels 1..6 */
855 for (i = 0; i < 6; i++) {
856 int freq = 56160 + 2160 * (i + 1);
857
858 if (edmg.channels & BIT(i)) {
859 contiguous++;
860 num_of_enabled++;
861 } else {
862 contiguous = 0;
863 continue;
864 }
865
866 /* P802.11ay defines that the total number of subfields
867 * set to one does not exceed 4.
868 */
869 if (num_of_enabled > 4)
870 return 0;
871
872 if (!hostapd_is_usable_chan(iface, freq, 1))
873 return 0;
874
875 if (contiguous > max_contiguous)
876 max_contiguous = contiguous;
877 }
878
879 /* Check if the EDMG configuration is valid under the limitations
880 * of P802.11ay.
881 */
882 /* check bw_config against contiguous EDMG channels */
883 switch (edmg.bw_config) {
884 case EDMG_BW_CONFIG_4:
885 if (!max_contiguous)
886 return 0;
887 break;
888 case EDMG_BW_CONFIG_5:
889 if (max_contiguous < 2)
890 return 0;
891 break;
892 default:
893 return 0;
894 }
895
896 return 1;
897 }
898
899
hostapd_is_usable_chans(struct hostapd_iface * iface)900 static int hostapd_is_usable_chans(struct hostapd_iface *iface)
901 {
902 int secondary_freq;
903 struct hostapd_channel_data *pri_chan;
904
905 if (!iface->current_mode)
906 return 0;
907 pri_chan = hw_get_channel_freq(iface->current_mode->mode,
908 iface->freq, NULL,
909 iface->hw_features,
910 iface->num_hw_features);
911 if (!pri_chan) {
912 wpa_printf(MSG_ERROR, "Primary frequency not present");
913 return 0;
914 }
915 if (!hostapd_is_usable_chan(iface, pri_chan->freq, 1)) {
916 wpa_printf(MSG_ERROR, "Primary frequency not allowed");
917 return 0;
918 }
919 if (!hostapd_is_usable_edmg(iface))
920 return 0;
921
922 if (!iface->conf->secondary_channel)
923 return 1;
924
925 if (hostapd_is_usable_chan(iface, iface->freq +
926 iface->conf->secondary_channel * 20, 0)) {
927 if (iface->conf->secondary_channel == 1 &&
928 (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P))
929 return 1;
930 if (iface->conf->secondary_channel == -1 &&
931 (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40M))
932 return 1;
933 }
934 if (!iface->conf->ht40_plus_minus_allowed)
935 return 0;
936
937 /* Both HT40+ and HT40- are set, pick a valid secondary channel */
938 secondary_freq = iface->freq + 20;
939 if (hostapd_is_usable_chan(iface, secondary_freq, 0) &&
940 (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P)) {
941 iface->conf->secondary_channel = 1;
942 return 1;
943 }
944
945 secondary_freq = iface->freq - 20;
946 if (hostapd_is_usable_chan(iface, secondary_freq, 0) &&
947 (pri_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40M)) {
948 iface->conf->secondary_channel = -1;
949 return 1;
950 }
951
952 return 0;
953 }
954
955
hostapd_determine_mode(struct hostapd_iface * iface)956 static void hostapd_determine_mode(struct hostapd_iface *iface)
957 {
958 int i;
959 enum hostapd_hw_mode target_mode;
960
961 if (iface->current_mode ||
962 iface->conf->hw_mode != HOSTAPD_MODE_IEEE80211ANY)
963 return;
964
965 if (iface->freq < 4000)
966 target_mode = HOSTAPD_MODE_IEEE80211G;
967 else if (iface->freq > 50000)
968 target_mode = HOSTAPD_MODE_IEEE80211AD;
969 else
970 target_mode = HOSTAPD_MODE_IEEE80211A;
971
972 for (i = 0; i < iface->num_hw_features; i++) {
973 struct hostapd_hw_modes *mode;
974
975 mode = &iface->hw_features[i];
976 if (mode->mode == target_mode) {
977 iface->current_mode = mode;
978 iface->conf->hw_mode = mode->mode;
979 break;
980 }
981 }
982
983 if (!iface->current_mode)
984 wpa_printf(MSG_ERROR, "ACS: Cannot decide mode");
985 }
986
987
988 static enum hostapd_chan_status
hostapd_check_chans(struct hostapd_iface * iface)989 hostapd_check_chans(struct hostapd_iface *iface)
990 {
991 if (iface->freq) {
992 hostapd_determine_mode(iface);
993 if (hostapd_is_usable_chans(iface))
994 return HOSTAPD_CHAN_VALID;
995 else
996 return HOSTAPD_CHAN_INVALID;
997 }
998
999 /*
1000 * The user set channel=0 or channel=acs_survey
1001 * which is used to trigger ACS.
1002 */
1003
1004 switch (acs_init(iface)) {
1005 case HOSTAPD_CHAN_ACS:
1006 return HOSTAPD_CHAN_ACS;
1007 case HOSTAPD_CHAN_VALID:
1008 case HOSTAPD_CHAN_INVALID:
1009 default:
1010 return HOSTAPD_CHAN_INVALID;
1011 }
1012 }
1013
1014
hostapd_notify_bad_chans(struct hostapd_iface * iface)1015 static void hostapd_notify_bad_chans(struct hostapd_iface *iface)
1016 {
1017 if (!iface->current_mode) {
1018 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
1019 HOSTAPD_LEVEL_WARNING,
1020 "Hardware does not support configured mode");
1021 return;
1022 }
1023 hostapd_logger(iface->bss[0], NULL,
1024 HOSTAPD_MODULE_IEEE80211,
1025 HOSTAPD_LEVEL_WARNING,
1026 "Configured channel (%d) or frequency (%d) (secondary_channel=%d) not found from the channel list of the current mode (%d) %s",
1027 iface->conf->channel,
1028 iface->freq, iface->conf->secondary_channel,
1029 iface->current_mode->mode,
1030 hostapd_hw_mode_txt(iface->current_mode->mode));
1031 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
1032 HOSTAPD_LEVEL_WARNING,
1033 "Hardware does not support configured channel");
1034 }
1035
1036
hostapd_acs_completed(struct hostapd_iface * iface,int err)1037 int hostapd_acs_completed(struct hostapd_iface *iface, int err)
1038 {
1039 int ret = -1;
1040
1041 if (err)
1042 goto out;
1043
1044 switch (hostapd_check_chans(iface)) {
1045 case HOSTAPD_CHAN_VALID:
1046 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO,
1047 ACS_EVENT_COMPLETED "freq=%d channel=%d",
1048 iface->freq, iface->conf->channel);
1049 break;
1050 case HOSTAPD_CHAN_ACS:
1051 wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available");
1052 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
1053 hostapd_notify_bad_chans(iface);
1054 goto out;
1055 case HOSTAPD_CHAN_INVALID:
1056 default:
1057 wpa_printf(MSG_ERROR, "ACS picked unusable channels");
1058 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
1059 hostapd_notify_bad_chans(iface);
1060 goto out;
1061 }
1062
1063 ret = hostapd_check_ht_capab(iface);
1064 if (ret < 0)
1065 goto out;
1066 if (ret == 1) {
1067 wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback");
1068 return 0;
1069 }
1070
1071 ret = 0;
1072 out:
1073 return hostapd_setup_interface_complete(iface, ret);
1074 }
1075
1076
1077 /**
1078 * hostapd_select_hw_mode - Select the hardware mode
1079 * @iface: Pointer to interface data.
1080 * Returns: 0 on success, < 0 on failure
1081 *
1082 * Sets up the hardware mode, channel, rates, and passive scanning
1083 * based on the configuration.
1084 */
hostapd_select_hw_mode(struct hostapd_iface * iface)1085 int hostapd_select_hw_mode(struct hostapd_iface *iface)
1086 {
1087 int i;
1088
1089 if (iface->num_hw_features < 1)
1090 return -1;
1091
1092 if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G ||
1093 iface->conf->ieee80211n || iface->conf->ieee80211ac ||
1094 iface->conf->ieee80211ax) &&
1095 iface->conf->channel == 14) {
1096 wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT/HE on channel 14");
1097 iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B;
1098 iface->conf->ieee80211n = 0;
1099 iface->conf->ieee80211ac = 0;
1100 iface->conf->ieee80211ax = 0;
1101 }
1102
1103 iface->current_mode = NULL;
1104 for (i = 0; i < iface->num_hw_features; i++) {
1105 struct hostapd_hw_modes *mode = &iface->hw_features[i];
1106 int chan;
1107
1108 if (mode->mode == iface->conf->hw_mode) {
1109 if (iface->freq > 0 &&
1110 !hw_mode_get_channel(mode, iface->freq, &chan))
1111 continue;
1112
1113 iface->current_mode = mode;
1114 break;
1115 }
1116 }
1117
1118 if (iface->current_mode == NULL) {
1119 if ((iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) &&
1120 (iface->drv_flags & WPA_DRIVER_FLAGS_SUPPORT_HW_MODE_ANY)) {
1121 wpa_printf(MSG_DEBUG,
1122 "Using offloaded hw_mode=any ACS");
1123 } else if (!(iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) &&
1124 iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211ANY) {
1125 wpa_printf(MSG_DEBUG,
1126 "Using internal ACS for hw_mode=any");
1127 } else {
1128 wpa_printf(MSG_ERROR,
1129 "Hardware does not support configured mode");
1130 hostapd_logger(iface->bss[0], NULL,
1131 HOSTAPD_MODULE_IEEE80211,
1132 HOSTAPD_LEVEL_WARNING,
1133 "Hardware does not support configured mode (%d) (hw_mode in hostapd.conf)",
1134 (int) iface->conf->hw_mode);
1135 return -2;
1136 }
1137 }
1138
1139 switch (hostapd_check_chans(iface)) {
1140 case HOSTAPD_CHAN_VALID:
1141 return 0;
1142 case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */
1143 return 1;
1144 case HOSTAPD_CHAN_INVALID:
1145 default:
1146 hostapd_notify_bad_chans(iface);
1147 return -3;
1148 }
1149 }
1150
1151
hostapd_hw_mode_txt(int mode)1152 const char * hostapd_hw_mode_txt(int mode)
1153 {
1154 switch (mode) {
1155 case HOSTAPD_MODE_IEEE80211A:
1156 return "IEEE 802.11a";
1157 case HOSTAPD_MODE_IEEE80211B:
1158 return "IEEE 802.11b";
1159 case HOSTAPD_MODE_IEEE80211G:
1160 return "IEEE 802.11g";
1161 case HOSTAPD_MODE_IEEE80211AD:
1162 return "IEEE 802.11ad";
1163 default:
1164 return "UNKNOWN";
1165 }
1166 }
1167
1168
hostapd_hw_get_freq(struct hostapd_data * hapd,int chan)1169 int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
1170 {
1171 return hw_get_freq(hapd->iface->current_mode, chan);
1172 }
1173
1174
hostapd_hw_get_channel(struct hostapd_data * hapd,int freq)1175 int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
1176 {
1177 int i, channel;
1178 struct hostapd_hw_modes *mode;
1179
1180 if (hapd->iface->current_mode) {
1181 channel = hw_get_chan(hapd->iface->current_mode->mode, freq,
1182 hapd->iface->hw_features,
1183 hapd->iface->num_hw_features);
1184 if (channel)
1185 return channel;
1186 }
1187
1188 /* Check other available modes since the channel list for the current
1189 * mode did not include the specified frequency. */
1190 if (!hapd->iface->hw_features)
1191 return 0;
1192 for (i = 0; i < hapd->iface->num_hw_features; i++) {
1193 mode = &hapd->iface->hw_features[i];
1194 channel = hw_get_chan(mode->mode, freq,
1195 hapd->iface->hw_features,
1196 hapd->iface->num_hw_features);
1197 if (channel)
1198 return channel;
1199 }
1200 return 0;
1201 }
1202
1203
hostapd_hw_skip_mode(struct hostapd_iface * iface,struct hostapd_hw_modes * mode)1204 int hostapd_hw_skip_mode(struct hostapd_iface *iface,
1205 struct hostapd_hw_modes *mode)
1206 {
1207 int i;
1208
1209 if (iface->current_mode)
1210 return mode != iface->current_mode;
1211 if (mode->mode != HOSTAPD_MODE_IEEE80211B)
1212 return 0;
1213 for (i = 0; i < iface->num_hw_features; i++) {
1214 if (iface->hw_features[i].mode == HOSTAPD_MODE_IEEE80211G)
1215 return 1;
1216 }
1217 return 0;
1218 }
1219