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
82 if (hostapd_drv_none(hapd))
83 return -1;
84 modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags);
85 if (modes == NULL) {
86 hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
87 HOSTAPD_LEVEL_DEBUG,
88 "Fetching hardware channel/rate support not "
89 "supported.");
90 return -1;
91 }
92
93 iface->hw_flags = flags;
94
95 hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
96 iface->hw_features = modes;
97 iface->num_hw_features = num_modes;
98
99 for (i = 0; i < num_modes; i++) {
100 struct hostapd_hw_modes *feature = &modes[i];
101 int dfs_enabled = hapd->iconf->ieee80211h &&
102 (iface->drv_flags & WPA_DRIVER_FLAGS_RADAR);
103
104 /* set flag for channels we can use in current regulatory
105 * domain */
106 for (j = 0; j < feature->num_channels; j++) {
107 int dfs = 0;
108
109 /*
110 * Disable all channels that are marked not to allow
111 * to initiate radiation (a.k.a. passive scan and no
112 * IBSS).
113 * Use radar channels only if the driver supports DFS.
114 */
115 if ((feature->channels[j].flag &
116 HOSTAPD_CHAN_RADAR) && dfs_enabled) {
117 dfs = 1;
118 } else if (((feature->channels[j].flag &
119 HOSTAPD_CHAN_RADAR) &&
120 !(iface->drv_flags &
121 WPA_DRIVER_FLAGS_DFS_OFFLOAD)) ||
122 (feature->channels[j].flag &
123 HOSTAPD_CHAN_NO_IR)) {
124 feature->channels[j].flag |=
125 HOSTAPD_CHAN_DISABLED;
126 }
127
128 if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
129 continue;
130
131 wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
132 "chan=%d freq=%d MHz max_tx_power=%d dBm%s",
133 feature->mode,
134 feature->channels[j].chan,
135 feature->channels[j].freq,
136 feature->channels[j].max_tx_power,
137 dfs ? dfs_info(&feature->channels[j]) : "");
138 }
139 }
140
141 return 0;
142 }
143
144
hostapd_prepare_rates(struct hostapd_iface * iface,struct hostapd_hw_modes * mode)145 int hostapd_prepare_rates(struct hostapd_iface *iface,
146 struct hostapd_hw_modes *mode)
147 {
148 int i, num_basic_rates = 0;
149 int basic_rates_a[] = { 60, 120, 240, -1 };
150 int basic_rates_b[] = { 10, 20, -1 };
151 int basic_rates_g[] = { 10, 20, 55, 110, -1 };
152 int *basic_rates;
153
154 if (iface->conf->basic_rates)
155 basic_rates = iface->conf->basic_rates;
156 else switch (mode->mode) {
157 case HOSTAPD_MODE_IEEE80211A:
158 basic_rates = basic_rates_a;
159 break;
160 case HOSTAPD_MODE_IEEE80211B:
161 basic_rates = basic_rates_b;
162 break;
163 case HOSTAPD_MODE_IEEE80211G:
164 basic_rates = basic_rates_g;
165 break;
166 case HOSTAPD_MODE_IEEE80211AD:
167 return 0; /* No basic rates for 11ad */
168 default:
169 return -1;
170 }
171
172 i = 0;
173 while (basic_rates[i] >= 0)
174 i++;
175 if (i)
176 i++; /* -1 termination */
177 os_free(iface->basic_rates);
178 iface->basic_rates = os_malloc(i * sizeof(int));
179 if (iface->basic_rates)
180 os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int));
181
182 os_free(iface->current_rates);
183 iface->num_rates = 0;
184
185 iface->current_rates =
186 os_calloc(mode->num_rates, sizeof(struct hostapd_rate_data));
187 if (!iface->current_rates) {
188 wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
189 "table.");
190 return -1;
191 }
192
193 for (i = 0; i < mode->num_rates; i++) {
194 struct hostapd_rate_data *rate;
195
196 if (iface->conf->supported_rates &&
197 !hostapd_rate_found(iface->conf->supported_rates,
198 mode->rates[i]))
199 continue;
200
201 rate = &iface->current_rates[iface->num_rates];
202 rate->rate = mode->rates[i];
203 if (hostapd_rate_found(basic_rates, rate->rate)) {
204 rate->flags |= HOSTAPD_RATE_BASIC;
205 num_basic_rates++;
206 }
207 wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
208 iface->num_rates, rate->rate, rate->flags);
209 iface->num_rates++;
210 }
211
212 if ((iface->num_rates == 0 || num_basic_rates == 0) &&
213 (!iface->conf->ieee80211n || !iface->conf->require_ht)) {
214 wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
215 "rate sets (%d,%d).",
216 iface->num_rates, num_basic_rates);
217 return -1;
218 }
219
220 return 0;
221 }
222
223
224 #ifdef CONFIG_IEEE80211N
ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface * iface)225 static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
226 {
227 int pri_chan, sec_chan;
228
229 if (!iface->conf->secondary_channel)
230 return 1; /* HT40 not used */
231
232 pri_chan = iface->conf->channel;
233 sec_chan = pri_chan + iface->conf->secondary_channel * 4;
234
235 return allowed_ht40_channel_pair(iface->current_mode, pri_chan,
236 sec_chan);
237 }
238
239
ieee80211n_switch_pri_sec(struct hostapd_iface * iface)240 static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
241 {
242 if (iface->conf->secondary_channel > 0) {
243 iface->conf->channel += 4;
244 iface->conf->secondary_channel = -1;
245 } else {
246 iface->conf->channel -= 4;
247 iface->conf->secondary_channel = 1;
248 }
249 }
250
251
ieee80211n_check_40mhz_5g(struct hostapd_iface * iface,struct wpa_scan_results * scan_res)252 static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
253 struct wpa_scan_results *scan_res)
254 {
255 int pri_chan, sec_chan;
256 int res;
257
258 pri_chan = iface->conf->channel;
259 sec_chan = pri_chan + iface->conf->secondary_channel * 4;
260
261 res = check_40mhz_5g(iface->current_mode, scan_res, pri_chan, sec_chan);
262
263 if (res == 2) {
264 if (iface->conf->no_pri_sec_switch) {
265 wpa_printf(MSG_DEBUG,
266 "Cannot switch PRI/SEC channels due to local constraint");
267 } else {
268 ieee80211n_switch_pri_sec(iface);
269 }
270 }
271
272 return !!res;
273 }
274
275
ieee80211n_check_40mhz_2g4(struct hostapd_iface * iface,struct wpa_scan_results * scan_res)276 static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
277 struct wpa_scan_results *scan_res)
278 {
279 int pri_chan, sec_chan;
280
281 pri_chan = iface->conf->channel;
282 sec_chan = pri_chan + iface->conf->secondary_channel * 4;
283
284 return check_40mhz_2g4(iface->current_mode, scan_res, pri_chan,
285 sec_chan);
286 }
287
288
ieee80211n_check_scan(struct hostapd_iface * iface)289 static void ieee80211n_check_scan(struct hostapd_iface *iface)
290 {
291 struct wpa_scan_results *scan_res;
292 int oper40;
293 int res;
294
295 /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
296 * allowed per IEEE Std 802.11-2012, 10.15.3.2 */
297
298 iface->scan_cb = NULL;
299
300 scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
301 if (scan_res == NULL) {
302 hostapd_setup_interface_complete(iface, 1);
303 return;
304 }
305
306 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
307 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
308 else
309 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
310 wpa_scan_results_free(scan_res);
311
312 iface->secondary_ch = iface->conf->secondary_channel;
313 if (!oper40) {
314 wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
315 "channel pri=%d sec=%d based on overlapping BSSes",
316 iface->conf->channel,
317 iface->conf->channel +
318 iface->conf->secondary_channel * 4);
319 iface->conf->secondary_channel = 0;
320 if (iface->drv_flags & WPA_DRIVER_FLAGS_HT_2040_COEX) {
321 /*
322 * TODO: Could consider scheduling another scan to check
323 * if channel width can be changed if no coex reports
324 * are received from associating stations.
325 */
326 }
327 }
328
329 res = ieee80211n_allowed_ht40_channel_pair(iface);
330 if (!res) {
331 iface->conf->secondary_channel = 0;
332 res = 1;
333 wpa_printf(MSG_INFO, "Fallback to 20 MHz");
334 }
335
336 hostapd_setup_interface_complete(iface, !res);
337 }
338
339
ieee80211n_scan_channels_2g4(struct hostapd_iface * iface,struct wpa_driver_scan_params * params)340 static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface,
341 struct wpa_driver_scan_params *params)
342 {
343 /* Scan only the affected frequency range */
344 int pri_freq, sec_freq;
345 int affected_start, affected_end;
346 int i, pos;
347 struct hostapd_hw_modes *mode;
348
349 if (iface->current_mode == NULL)
350 return;
351
352 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
353 if (iface->conf->secondary_channel > 0)
354 sec_freq = pri_freq + 20;
355 else
356 sec_freq = pri_freq - 20;
357 /*
358 * Note: Need to find the PRI channel also in cases where the affected
359 * channel is the SEC channel of a 40 MHz BSS, so need to include the
360 * scanning coverage here to be 40 MHz from the center frequency.
361 */
362 affected_start = (pri_freq + sec_freq) / 2 - 40;
363 affected_end = (pri_freq + sec_freq) / 2 + 40;
364 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
365 affected_start, affected_end);
366
367 mode = iface->current_mode;
368 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
369 if (params->freqs == NULL)
370 return;
371 pos = 0;
372
373 for (i = 0; i < mode->num_channels; i++) {
374 struct hostapd_channel_data *chan = &mode->channels[i];
375 if (chan->flag & HOSTAPD_CHAN_DISABLED)
376 continue;
377 if (chan->freq < affected_start ||
378 chan->freq > affected_end)
379 continue;
380 params->freqs[pos++] = chan->freq;
381 }
382 }
383
384
ieee80211n_scan_channels_5g(struct hostapd_iface * iface,struct wpa_driver_scan_params * params)385 static void ieee80211n_scan_channels_5g(struct hostapd_iface *iface,
386 struct wpa_driver_scan_params *params)
387 {
388 /* Scan only the affected frequency range */
389 int pri_freq;
390 int affected_start, affected_end;
391 int i, pos;
392 struct hostapd_hw_modes *mode;
393
394 if (iface->current_mode == NULL)
395 return;
396
397 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
398 if (iface->conf->secondary_channel > 0) {
399 affected_start = pri_freq - 10;
400 affected_end = pri_freq + 30;
401 } else {
402 affected_start = pri_freq - 30;
403 affected_end = pri_freq + 10;
404 }
405 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
406 affected_start, affected_end);
407
408 mode = iface->current_mode;
409 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
410 if (params->freqs == NULL)
411 return;
412 pos = 0;
413
414 for (i = 0; i < mode->num_channels; i++) {
415 struct hostapd_channel_data *chan = &mode->channels[i];
416 if (chan->flag & HOSTAPD_CHAN_DISABLED)
417 continue;
418 if (chan->freq < affected_start ||
419 chan->freq > affected_end)
420 continue;
421 params->freqs[pos++] = chan->freq;
422 }
423 }
424
425
ap_ht40_scan_retry(void * eloop_data,void * user_data)426 static void ap_ht40_scan_retry(void *eloop_data, void *user_data)
427 {
428 #define HT2040_COEX_SCAN_RETRY 15
429 struct hostapd_iface *iface = eloop_data;
430 struct wpa_driver_scan_params params;
431 int ret;
432
433 os_memset(¶ms, 0, sizeof(params));
434 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
435 ieee80211n_scan_channels_2g4(iface, ¶ms);
436 else
437 ieee80211n_scan_channels_5g(iface, ¶ms);
438
439 ret = hostapd_driver_scan(iface->bss[0], ¶ms);
440 iface->num_ht40_scan_tries++;
441 os_free(params.freqs);
442
443 if (ret == -EBUSY &&
444 iface->num_ht40_scan_tries < HT2040_COEX_SCAN_RETRY) {
445 wpa_printf(MSG_ERROR,
446 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again (attempt %d)",
447 ret, strerror(-ret), iface->num_ht40_scan_tries);
448 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
449 return;
450 }
451
452 if (ret == 0) {
453 iface->scan_cb = ieee80211n_check_scan;
454 return;
455 }
456
457 wpa_printf(MSG_DEBUG,
458 "Failed to request a scan in device, bringing up in HT20 mode");
459 iface->conf->secondary_channel = 0;
460 iface->conf->ht_capab &= ~HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
461 hostapd_setup_interface_complete(iface, 0);
462 }
463
464
hostapd_stop_setup_timers(struct hostapd_iface * iface)465 void hostapd_stop_setup_timers(struct hostapd_iface *iface)
466 {
467 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
468 }
469
470
ieee80211n_check_40mhz(struct hostapd_iface * iface)471 static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
472 {
473 struct wpa_driver_scan_params params;
474 int ret;
475
476 /* Check that HT40 is used and PRI / SEC switch is allowed */
477 if (!iface->conf->secondary_channel || iface->conf->no_pri_sec_switch)
478 return 0;
479
480 hostapd_set_state(iface, HAPD_IFACE_HT_SCAN);
481 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
482 "40 MHz channel");
483 os_memset(¶ms, 0, sizeof(params));
484 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
485 ieee80211n_scan_channels_2g4(iface, ¶ms);
486 else
487 ieee80211n_scan_channels_5g(iface, ¶ms);
488
489 ret = hostapd_driver_scan(iface->bss[0], ¶ms);
490 os_free(params.freqs);
491
492 if (ret == -EBUSY) {
493 wpa_printf(MSG_ERROR,
494 "Failed to request a scan of neighboring BSSes ret=%d (%s) - try to scan again",
495 ret, strerror(-ret));
496 iface->num_ht40_scan_tries = 1;
497 eloop_cancel_timeout(ap_ht40_scan_retry, iface, NULL);
498 eloop_register_timeout(1, 0, ap_ht40_scan_retry, iface, NULL);
499 return 1;
500 }
501
502 if (ret < 0) {
503 wpa_printf(MSG_ERROR,
504 "Failed to request a scan of neighboring BSSes ret=%d (%s)",
505 ret, strerror(-ret));
506 return -1;
507 }
508
509 iface->scan_cb = ieee80211n_check_scan;
510 return 1;
511 }
512
513
ieee80211n_supported_ht_capab(struct hostapd_iface * iface)514 static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
515 {
516 u16 hw = iface->current_mode->ht_capab;
517 u16 conf = iface->conf->ht_capab;
518
519 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
520 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
521 wpa_printf(MSG_ERROR, "Driver does not support configured "
522 "HT capability [LDPC]");
523 return 0;
524 }
525
526 /*
527 * Driver ACS chosen channel may not be HT40 due to internal driver
528 * restrictions.
529 */
530 if (!iface->conf->acs && (conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
531 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
532 wpa_printf(MSG_ERROR, "Driver does not support configured "
533 "HT capability [HT40*]");
534 return 0;
535 }
536
537 switch (conf & HT_CAP_INFO_SMPS_MASK) {
538 case HT_CAP_INFO_SMPS_STATIC:
539 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_STATIC)) {
540 wpa_printf(MSG_ERROR,
541 "Driver does not support configured HT capability [SMPS-STATIC]");
542 return 0;
543 }
544 break;
545 case HT_CAP_INFO_SMPS_DYNAMIC:
546 if (!(iface->smps_modes & WPA_DRIVER_SMPS_MODE_DYNAMIC)) {
547 wpa_printf(MSG_ERROR,
548 "Driver does not support configured HT capability [SMPS-DYNAMIC]");
549 return 0;
550 }
551 break;
552 case HT_CAP_INFO_SMPS_DISABLED:
553 default:
554 break;
555 }
556
557 if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
558 !(hw & HT_CAP_INFO_GREEN_FIELD)) {
559 wpa_printf(MSG_ERROR, "Driver does not support configured "
560 "HT capability [GF]");
561 return 0;
562 }
563
564 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
565 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
566 wpa_printf(MSG_ERROR, "Driver does not support configured "
567 "HT capability [SHORT-GI-20]");
568 return 0;
569 }
570
571 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
572 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
573 wpa_printf(MSG_ERROR, "Driver does not support configured "
574 "HT capability [SHORT-GI-40]");
575 return 0;
576 }
577
578 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
579 wpa_printf(MSG_ERROR, "Driver does not support configured "
580 "HT capability [TX-STBC]");
581 return 0;
582 }
583
584 if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
585 (hw & HT_CAP_INFO_RX_STBC_MASK)) {
586 wpa_printf(MSG_ERROR, "Driver does not support configured "
587 "HT capability [RX-STBC*]");
588 return 0;
589 }
590
591 if ((conf & HT_CAP_INFO_DELAYED_BA) &&
592 !(hw & HT_CAP_INFO_DELAYED_BA)) {
593 wpa_printf(MSG_ERROR, "Driver does not support configured "
594 "HT capability [DELAYED-BA]");
595 return 0;
596 }
597
598 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
599 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
600 wpa_printf(MSG_ERROR, "Driver does not support configured "
601 "HT capability [MAX-AMSDU-7935]");
602 return 0;
603 }
604
605 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
606 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
607 wpa_printf(MSG_ERROR, "Driver does not support configured "
608 "HT capability [DSSS_CCK-40]");
609 return 0;
610 }
611
612 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
613 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
614 wpa_printf(MSG_ERROR, "Driver does not support configured "
615 "HT capability [LSIG-TXOP-PROT]");
616 return 0;
617 }
618
619 return 1;
620 }
621
622
623 #ifdef CONFIG_IEEE80211AC
624
ieee80211ac_cap_check(u32 hw,u32 conf,u32 cap,const char * name)625 static int ieee80211ac_cap_check(u32 hw, u32 conf, u32 cap, const char *name)
626 {
627 u32 req_cap = conf & cap;
628
629 /*
630 * Make sure we support all requested capabilities.
631 * NOTE: We assume that 'cap' represents a capability mask,
632 * not a discrete value.
633 */
634 if ((hw & req_cap) != req_cap) {
635 wpa_printf(MSG_ERROR, "Driver does not support configured VHT capability [%s]",
636 name);
637 return 0;
638 }
639 return 1;
640 }
641
642
ieee80211ac_cap_check_max(u32 hw,u32 conf,u32 mask,unsigned int shift,const char * name)643 static int ieee80211ac_cap_check_max(u32 hw, u32 conf, u32 mask,
644 unsigned int shift,
645 const char *name)
646 {
647 u32 hw_max = hw & mask;
648 u32 conf_val = conf & mask;
649
650 if (conf_val > hw_max) {
651 wpa_printf(MSG_ERROR, "Configured VHT capability [%s] exceeds max value supported by the driver (%d > %d)",
652 name, conf_val >> shift, hw_max >> shift);
653 return 0;
654 }
655 return 1;
656 }
657
658
ieee80211ac_supported_vht_capab(struct hostapd_iface * iface)659 static int ieee80211ac_supported_vht_capab(struct hostapd_iface *iface)
660 {
661 struct hostapd_hw_modes *mode = iface->current_mode;
662 u32 hw = mode->vht_capab;
663 u32 conf = iface->conf->vht_capab;
664
665 wpa_printf(MSG_DEBUG, "hw vht capab: 0x%x, conf vht capab: 0x%x",
666 hw, conf);
667
668 if (mode->mode == HOSTAPD_MODE_IEEE80211G &&
669 iface->conf->bss[0]->vendor_vht &&
670 mode->vht_capab == 0 && iface->hw_features) {
671 int i;
672
673 for (i = 0; i < iface->num_hw_features; i++) {
674 if (iface->hw_features[i].mode ==
675 HOSTAPD_MODE_IEEE80211A) {
676 mode = &iface->hw_features[i];
677 hw = mode->vht_capab;
678 wpa_printf(MSG_DEBUG,
679 "update hw vht capab based on 5 GHz band: 0x%x",
680 hw);
681 break;
682 }
683 }
684 }
685
686 #define VHT_CAP_CHECK(cap) \
687 do { \
688 if (!ieee80211ac_cap_check(hw, conf, cap, #cap)) \
689 return 0; \
690 } while (0)
691
692 #define VHT_CAP_CHECK_MAX(cap) \
693 do { \
694 if (!ieee80211ac_cap_check_max(hw, conf, cap, cap ## _SHIFT, \
695 #cap)) \
696 return 0; \
697 } while (0)
698
699 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK);
700 VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ);
701 VHT_CAP_CHECK(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ);
702 VHT_CAP_CHECK(VHT_CAP_RXLDPC);
703 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80);
704 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160);
705 VHT_CAP_CHECK(VHT_CAP_TXSTBC);
706 VHT_CAP_CHECK_MAX(VHT_CAP_RXSTBC_MASK);
707 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMER_CAPABLE);
708 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMEE_CAPABLE);
709 VHT_CAP_CHECK_MAX(VHT_CAP_BEAMFORMEE_STS_MAX);
710 VHT_CAP_CHECK_MAX(VHT_CAP_SOUNDING_DIMENSION_MAX);
711 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMER_CAPABLE);
712 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMEE_CAPABLE);
713 VHT_CAP_CHECK(VHT_CAP_VHT_TXOP_PS);
714 VHT_CAP_CHECK(VHT_CAP_HTC_VHT);
715 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MAX);
716 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB);
717 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB);
718 VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN);
719 VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN);
720
721 #undef VHT_CAP_CHECK
722 #undef VHT_CAP_CHECK_MAX
723
724 return 1;
725 }
726 #endif /* CONFIG_IEEE80211AC */
727
728 #endif /* CONFIG_IEEE80211N */
729
730
hostapd_check_ht_capab(struct hostapd_iface * iface)731 int hostapd_check_ht_capab(struct hostapd_iface *iface)
732 {
733 #ifdef CONFIG_IEEE80211N
734 int ret;
735 if (!iface->conf->ieee80211n)
736 return 0;
737
738 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211B &&
739 iface->current_mode->mode != HOSTAPD_MODE_IEEE80211G &&
740 (iface->conf->ht_capab & HT_CAP_INFO_DSSS_CCK40MHZ)) {
741 wpa_printf(MSG_DEBUG,
742 "Disable HT capability [DSSS_CCK-40] on 5 GHz band");
743 iface->conf->ht_capab &= ~HT_CAP_INFO_DSSS_CCK40MHZ;
744 }
745
746 if (!ieee80211n_supported_ht_capab(iface))
747 return -1;
748 #ifdef CONFIG_IEEE80211AC
749 if (!ieee80211ac_supported_vht_capab(iface))
750 return -1;
751 #endif /* CONFIG_IEEE80211AC */
752 ret = ieee80211n_check_40mhz(iface);
753 if (ret)
754 return ret;
755 if (!ieee80211n_allowed_ht40_channel_pair(iface))
756 return -1;
757 #endif /* CONFIG_IEEE80211N */
758
759 return 0;
760 }
761
762
hostapd_is_usable_chan(struct hostapd_iface * iface,int channel,int primary)763 static int hostapd_is_usable_chan(struct hostapd_iface *iface,
764 int channel, int primary)
765 {
766 int i;
767 struct hostapd_channel_data *chan;
768
769 if (!iface->current_mode)
770 return 0;
771
772 for (i = 0; i < iface->current_mode->num_channels; i++) {
773 chan = &iface->current_mode->channels[i];
774 if (chan->chan != channel)
775 continue;
776
777 if (!(chan->flag & HOSTAPD_CHAN_DISABLED))
778 return 1;
779
780 wpa_printf(MSG_DEBUG,
781 "%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s",
782 primary ? "" : "Configured HT40 secondary ",
783 i, chan->chan, chan->flag,
784 chan->flag & HOSTAPD_CHAN_NO_IR ? " NO-IR" : "",
785 chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : "");
786 }
787
788 return 0;
789 }
790
791
hostapd_is_usable_chans(struct hostapd_iface * iface)792 static int hostapd_is_usable_chans(struct hostapd_iface *iface)
793 {
794 if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1))
795 return 0;
796
797 if (!iface->conf->secondary_channel)
798 return 1;
799
800 return hostapd_is_usable_chan(iface, iface->conf->channel +
801 iface->conf->secondary_channel * 4, 0);
802 }
803
804
805 static enum hostapd_chan_status
hostapd_check_chans(struct hostapd_iface * iface)806 hostapd_check_chans(struct hostapd_iface *iface)
807 {
808 if (iface->conf->channel) {
809 if (hostapd_is_usable_chans(iface))
810 return HOSTAPD_CHAN_VALID;
811 else
812 return HOSTAPD_CHAN_INVALID;
813 }
814
815 /*
816 * The user set channel=0 or channel=acs_survey
817 * which is used to trigger ACS.
818 */
819
820 switch (acs_init(iface)) {
821 case HOSTAPD_CHAN_ACS:
822 return HOSTAPD_CHAN_ACS;
823 case HOSTAPD_CHAN_VALID:
824 case HOSTAPD_CHAN_INVALID:
825 default:
826 return HOSTAPD_CHAN_INVALID;
827 }
828 }
829
830
hostapd_notify_bad_chans(struct hostapd_iface * iface)831 static void hostapd_notify_bad_chans(struct hostapd_iface *iface)
832 {
833 if (!iface->current_mode) {
834 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
835 HOSTAPD_LEVEL_WARNING,
836 "Hardware does not support configured mode");
837 return;
838 }
839 hostapd_logger(iface->bss[0], NULL,
840 HOSTAPD_MODULE_IEEE80211,
841 HOSTAPD_LEVEL_WARNING,
842 "Configured channel (%d) not found from the "
843 "channel list of current mode (%d) %s",
844 iface->conf->channel,
845 iface->current_mode->mode,
846 hostapd_hw_mode_txt(iface->current_mode->mode));
847 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
848 HOSTAPD_LEVEL_WARNING,
849 "Hardware does not support configured channel");
850 }
851
852
hostapd_acs_completed(struct hostapd_iface * iface,int err)853 int hostapd_acs_completed(struct hostapd_iface *iface, int err)
854 {
855 int ret = -1;
856
857 if (err)
858 goto out;
859
860 switch (hostapd_check_chans(iface)) {
861 case HOSTAPD_CHAN_VALID:
862 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO,
863 ACS_EVENT_COMPLETED "freq=%d channel=%d",
864 hostapd_hw_get_freq(iface->bss[0],
865 iface->conf->channel),
866 iface->conf->channel);
867 break;
868 case HOSTAPD_CHAN_ACS:
869 wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available");
870 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
871 hostapd_notify_bad_chans(iface);
872 goto out;
873 case HOSTAPD_CHAN_INVALID:
874 default:
875 wpa_printf(MSG_ERROR, "ACS picked unusable channels");
876 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, ACS_EVENT_FAILED);
877 hostapd_notify_bad_chans(iface);
878 goto out;
879 }
880
881 ret = hostapd_check_ht_capab(iface);
882 if (ret < 0)
883 goto out;
884 if (ret == 1) {
885 wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback");
886 return 0;
887 }
888
889 ret = 0;
890 out:
891 return hostapd_setup_interface_complete(iface, ret);
892 }
893
894
895 /**
896 * hostapd_select_hw_mode - Select the hardware mode
897 * @iface: Pointer to interface data.
898 * Returns: 0 on success, < 0 on failure
899 *
900 * Sets up the hardware mode, channel, rates, and passive scanning
901 * based on the configuration.
902 */
hostapd_select_hw_mode(struct hostapd_iface * iface)903 int hostapd_select_hw_mode(struct hostapd_iface *iface)
904 {
905 int i;
906
907 if (iface->num_hw_features < 1)
908 return -1;
909
910 if ((iface->conf->hw_mode == HOSTAPD_MODE_IEEE80211G ||
911 iface->conf->ieee80211n || iface->conf->ieee80211ac) &&
912 iface->conf->channel == 14) {
913 wpa_printf(MSG_INFO, "Disable OFDM/HT/VHT on channel 14");
914 iface->conf->hw_mode = HOSTAPD_MODE_IEEE80211B;
915 iface->conf->ieee80211n = 0;
916 iface->conf->ieee80211ac = 0;
917 }
918
919 iface->current_mode = NULL;
920 for (i = 0; i < iface->num_hw_features; i++) {
921 struct hostapd_hw_modes *mode = &iface->hw_features[i];
922 if (mode->mode == iface->conf->hw_mode) {
923 iface->current_mode = mode;
924 break;
925 }
926 }
927
928 if (iface->current_mode == NULL) {
929 if (!(iface->drv_flags & WPA_DRIVER_FLAGS_ACS_OFFLOAD) ||
930 !(iface->drv_flags & WPA_DRIVER_FLAGS_SUPPORT_HW_MODE_ANY))
931 {
932 wpa_printf(MSG_ERROR,
933 "Hardware does not support configured mode");
934 hostapd_logger(iface->bss[0], NULL,
935 HOSTAPD_MODULE_IEEE80211,
936 HOSTAPD_LEVEL_WARNING,
937 "Hardware does not support configured mode (%d) (hw_mode in hostapd.conf)",
938 (int) iface->conf->hw_mode);
939 return -2;
940 }
941 }
942
943 switch (hostapd_check_chans(iface)) {
944 case HOSTAPD_CHAN_VALID:
945 return 0;
946 case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */
947 return 1;
948 case HOSTAPD_CHAN_INVALID:
949 default:
950 hostapd_notify_bad_chans(iface);
951 return -3;
952 }
953 }
954
955
hostapd_hw_mode_txt(int mode)956 const char * hostapd_hw_mode_txt(int mode)
957 {
958 switch (mode) {
959 case HOSTAPD_MODE_IEEE80211A:
960 return "IEEE 802.11a";
961 case HOSTAPD_MODE_IEEE80211B:
962 return "IEEE 802.11b";
963 case HOSTAPD_MODE_IEEE80211G:
964 return "IEEE 802.11g";
965 case HOSTAPD_MODE_IEEE80211AD:
966 return "IEEE 802.11ad";
967 default:
968 return "UNKNOWN";
969 }
970 }
971
972
hostapd_hw_get_freq(struct hostapd_data * hapd,int chan)973 int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
974 {
975 return hw_get_freq(hapd->iface->current_mode, chan);
976 }
977
978
hostapd_hw_get_channel(struct hostapd_data * hapd,int freq)979 int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
980 {
981 return hw_get_chan(hapd->iface->current_mode, freq);
982 }
983