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 program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Alternatively, this software may be distributed under the terms of BSD
12 * license.
13 *
14 * See README and COPYING for more details.
15 */
16
17 #include "utils/includes.h"
18
19 #include "utils/common.h"
20 #include "utils/eloop.h"
21 #include "common/ieee802_11_defs.h"
22 #include "common/ieee802_11_common.h"
23 #include "drivers/driver.h"
24 #include "hostapd.h"
25 #include "ap_config.h"
26 #include "ap_drv_ops.h"
27 #include "acs.h"
28 #include "hw_features.h"
29
30
hostapd_free_hw_features(struct hostapd_hw_modes * hw_features,size_t num_hw_features)31 void hostapd_free_hw_features(struct hostapd_hw_modes *hw_features,
32 size_t num_hw_features)
33 {
34 size_t i;
35
36 if (hw_features == NULL)
37 return;
38
39 for (i = 0; i < num_hw_features; i++) {
40 os_free(hw_features[i].channels);
41 os_free(hw_features[i].rates);
42 }
43
44 os_free(hw_features);
45 }
46
47
hostapd_get_hw_features(struct hostapd_iface * iface)48 int hostapd_get_hw_features(struct hostapd_iface *iface)
49 {
50 struct hostapd_data *hapd = iface->bss[0];
51 int ret = 0, i, j;
52 u16 num_modes, flags;
53 struct hostapd_hw_modes *modes;
54
55 if (hostapd_drv_none(hapd))
56 return -1;
57 modes = hostapd_get_hw_feature_data(hapd, &num_modes, &flags);
58 if (modes == NULL) {
59 hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
60 HOSTAPD_LEVEL_DEBUG,
61 "Fetching hardware channel/rate support not "
62 "supported.");
63 return -1;
64 }
65
66 iface->hw_flags = flags;
67
68 hostapd_free_hw_features(iface->hw_features, iface->num_hw_features);
69 iface->hw_features = modes;
70 iface->num_hw_features = num_modes;
71
72 for (i = 0; i < num_modes; i++) {
73 struct hostapd_hw_modes *feature = &modes[i];
74 /* set flag for channels we can use in current regulatory
75 * domain */
76 for (j = 0; j < feature->num_channels; j++) {
77 /*
78 * Disable all channels that are marked not to allow
79 * IBSS operation or active scanning. In addition,
80 * disable all channels that require radar detection,
81 * since that (in addition to full DFS) is not yet
82 * supported.
83 */
84 if (feature->channels[j].flag &
85 (HOSTAPD_CHAN_NO_IBSS |
86 HOSTAPD_CHAN_PASSIVE_SCAN |
87 HOSTAPD_CHAN_RADAR))
88 feature->channels[j].flag |=
89 HOSTAPD_CHAN_DISABLED;
90 if (feature->channels[j].flag & HOSTAPD_CHAN_DISABLED)
91 continue;
92 wpa_printf(MSG_MSGDUMP, "Allowed channel: mode=%d "
93 "chan=%d freq=%d MHz max_tx_power=%d dBm",
94 feature->mode,
95 feature->channels[j].chan,
96 feature->channels[j].freq,
97 feature->channels[j].max_tx_power);
98 }
99 }
100
101 return ret;
102 }
103
104
hostapd_prepare_rates(struct hostapd_iface * iface,struct hostapd_hw_modes * mode)105 int hostapd_prepare_rates(struct hostapd_iface *iface,
106 struct hostapd_hw_modes *mode)
107 {
108 int i, num_basic_rates = 0;
109 int basic_rates_a[] = { 60, 120, 240, -1 };
110 int basic_rates_b[] = { 10, 20, -1 };
111 int basic_rates_g[] = { 10, 20, 55, 110, -1 };
112 int *basic_rates;
113
114 if (iface->conf->basic_rates)
115 basic_rates = iface->conf->basic_rates;
116 else switch (mode->mode) {
117 case HOSTAPD_MODE_IEEE80211A:
118 basic_rates = basic_rates_a;
119 break;
120 case HOSTAPD_MODE_IEEE80211B:
121 basic_rates = basic_rates_b;
122 break;
123 case HOSTAPD_MODE_IEEE80211G:
124 basic_rates = basic_rates_g;
125 break;
126 case HOSTAPD_MODE_IEEE80211AD:
127 return 0; /* No basic rates for 11ad */
128 default:
129 return -1;
130 }
131
132 i = 0;
133 while (basic_rates[i] >= 0)
134 i++;
135 if (i)
136 i++; /* -1 termination */
137 os_free(iface->basic_rates);
138 iface->basic_rates = os_malloc(i * sizeof(int));
139 if (iface->basic_rates)
140 os_memcpy(iface->basic_rates, basic_rates, i * sizeof(int));
141
142 os_free(iface->current_rates);
143 iface->num_rates = 0;
144
145 iface->current_rates =
146 os_calloc(mode->num_rates, sizeof(struct hostapd_rate_data));
147 if (!iface->current_rates) {
148 wpa_printf(MSG_ERROR, "Failed to allocate memory for rate "
149 "table.");
150 return -1;
151 }
152
153 for (i = 0; i < mode->num_rates; i++) {
154 struct hostapd_rate_data *rate;
155
156 if (iface->conf->supported_rates &&
157 !hostapd_rate_found(iface->conf->supported_rates,
158 mode->rates[i]))
159 continue;
160
161 rate = &iface->current_rates[iface->num_rates];
162 rate->rate = mode->rates[i];
163 if (hostapd_rate_found(basic_rates, rate->rate)) {
164 rate->flags |= HOSTAPD_RATE_BASIC;
165 num_basic_rates++;
166 }
167 wpa_printf(MSG_DEBUG, "RATE[%d] rate=%d flags=0x%x",
168 iface->num_rates, rate->rate, rate->flags);
169 iface->num_rates++;
170 }
171
172 if ((iface->num_rates == 0 || num_basic_rates == 0) &&
173 (!iface->conf->ieee80211n || !iface->conf->require_ht)) {
174 wpa_printf(MSG_ERROR, "No rates remaining in supported/basic "
175 "rate sets (%d,%d).",
176 iface->num_rates, num_basic_rates);
177 return -1;
178 }
179
180 return 0;
181 }
182
183
184 #ifdef CONFIG_IEEE80211N
ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface * iface)185 static int ieee80211n_allowed_ht40_channel_pair(struct hostapd_iface *iface)
186 {
187 int sec_chan, ok, j, first;
188 int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
189 184, 192 };
190 size_t k;
191
192 if (!iface->conf->secondary_channel)
193 return 1; /* HT40 not used */
194
195 sec_chan = iface->conf->channel + iface->conf->secondary_channel * 4;
196 wpa_printf(MSG_DEBUG, "HT40: control channel: %d "
197 "secondary channel: %d",
198 iface->conf->channel, sec_chan);
199
200 /* Verify that HT40 secondary channel is an allowed 20 MHz
201 * channel */
202 ok = 0;
203 for (j = 0; j < iface->current_mode->num_channels; j++) {
204 struct hostapd_channel_data *chan =
205 &iface->current_mode->channels[j];
206 if (!(chan->flag & HOSTAPD_CHAN_DISABLED) &&
207 chan->chan == sec_chan) {
208 ok = 1;
209 break;
210 }
211 }
212 if (!ok) {
213 wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
214 sec_chan);
215 return 0;
216 }
217
218 /*
219 * Verify that HT40 primary,secondary channel pair is allowed per
220 * IEEE 802.11n Annex J. This is only needed for 5 GHz band since
221 * 2.4 GHz rules allow all cases where the secondary channel fits into
222 * the list of allowed channels (already checked above).
223 */
224 if (iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
225 return 1;
226
227 if (iface->conf->secondary_channel > 0)
228 first = iface->conf->channel;
229 else
230 first = sec_chan;
231
232 ok = 0;
233 for (k = 0; k < sizeof(allowed) / sizeof(allowed[0]); k++) {
234 if (first == allowed[k]) {
235 ok = 1;
236 break;
237 }
238 }
239 if (!ok) {
240 wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
241 iface->conf->channel,
242 iface->conf->secondary_channel);
243 return 0;
244 }
245
246 return 1;
247 }
248
249
ieee80211n_switch_pri_sec(struct hostapd_iface * iface)250 static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
251 {
252 if (iface->conf->secondary_channel > 0) {
253 iface->conf->channel += 4;
254 iface->conf->secondary_channel = -1;
255 } else {
256 iface->conf->channel -= 4;
257 iface->conf->secondary_channel = 1;
258 }
259 }
260
261
ieee80211n_get_pri_sec_chan(struct wpa_scan_res * bss,int * pri_chan,int * sec_chan)262 static void ieee80211n_get_pri_sec_chan(struct wpa_scan_res *bss,
263 int *pri_chan, int *sec_chan)
264 {
265 struct ieee80211_ht_operation *oper;
266 struct ieee802_11_elems elems;
267
268 *pri_chan = *sec_chan = 0;
269
270 ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
271 if (elems.ht_operation &&
272 elems.ht_operation_len >= sizeof(*oper)) {
273 oper = (struct ieee80211_ht_operation *) elems.ht_operation;
274 *pri_chan = oper->control_chan;
275 if (oper->ht_param & HT_INFO_HT_PARAM_REC_TRANS_CHNL_WIDTH) {
276 int sec = oper->ht_param &
277 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
278 if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
279 *sec_chan = *pri_chan + 4;
280 else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
281 *sec_chan = *pri_chan - 4;
282 }
283 }
284 }
285
286
ieee80211n_check_40mhz_5g(struct hostapd_iface * iface,struct wpa_scan_results * scan_res)287 static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
288 struct wpa_scan_results *scan_res)
289 {
290 int pri_chan, sec_chan, pri_freq, sec_freq, pri_bss, sec_bss;
291 int bss_pri_chan, bss_sec_chan;
292 size_t i;
293 int match;
294
295 pri_chan = iface->conf->channel;
296 sec_chan = iface->conf->secondary_channel * 4;
297 pri_freq = hostapd_hw_get_freq(iface->bss[0], pri_chan);
298 if (iface->conf->secondary_channel > 0)
299 sec_freq = pri_freq + 20;
300 else
301 sec_freq = pri_freq - 20;
302
303 /*
304 * Switch PRI/SEC channels if Beacons were detected on selected SEC
305 * channel, but not on selected PRI channel.
306 */
307 pri_bss = sec_bss = 0;
308 for (i = 0; i < scan_res->num; i++) {
309 struct wpa_scan_res *bss = scan_res->res[i];
310 if (bss->freq == pri_freq)
311 pri_bss++;
312 else if (bss->freq == sec_freq)
313 sec_bss++;
314 }
315 if (sec_bss && !pri_bss) {
316 wpa_printf(MSG_INFO, "Switch own primary and secondary "
317 "channel to get secondary channel with no Beacons "
318 "from other BSSes");
319 ieee80211n_switch_pri_sec(iface);
320 }
321
322 /*
323 * Match PRI/SEC channel with any existing HT40 BSS on the same
324 * channels that we are about to use (if already mixed order in
325 * existing BSSes, use own preference).
326 */
327 match = 0;
328 for (i = 0; i < scan_res->num; i++) {
329 struct wpa_scan_res *bss = scan_res->res[i];
330 ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
331 if (pri_chan == bss_pri_chan &&
332 sec_chan == bss_sec_chan) {
333 match = 1;
334 break;
335 }
336 }
337 if (!match) {
338 for (i = 0; i < scan_res->num; i++) {
339 struct wpa_scan_res *bss = scan_res->res[i];
340 ieee80211n_get_pri_sec_chan(bss, &bss_pri_chan,
341 &bss_sec_chan);
342 if (pri_chan == bss_sec_chan &&
343 sec_chan == bss_pri_chan) {
344 wpa_printf(MSG_INFO, "Switch own primary and "
345 "secondary channel due to BSS "
346 "overlap with " MACSTR,
347 MAC2STR(bss->bssid));
348 ieee80211n_switch_pri_sec(iface);
349 break;
350 }
351 }
352 }
353
354 return 1;
355 }
356
357
ieee80211n_check_40mhz_2g4(struct hostapd_iface * iface,struct wpa_scan_results * scan_res)358 static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
359 struct wpa_scan_results *scan_res)
360 {
361 int pri_freq, sec_freq;
362 int affected_start, affected_end;
363 size_t i;
364
365 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
366 if (iface->conf->secondary_channel > 0)
367 sec_freq = pri_freq + 20;
368 else
369 sec_freq = pri_freq - 20;
370 affected_start = (pri_freq + sec_freq) / 2 - 25;
371 affected_end = (pri_freq + sec_freq) / 2 + 25;
372 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
373 affected_start, affected_end);
374 for (i = 0; i < scan_res->num; i++) {
375 struct wpa_scan_res *bss = scan_res->res[i];
376 int pri = bss->freq;
377 int sec = pri;
378 int sec_chan, pri_chan;
379
380 ieee80211n_get_pri_sec_chan(bss, &pri_chan, &sec_chan);
381
382 if (sec_chan) {
383 if (sec_chan < pri_chan)
384 sec = pri - 20;
385 else
386 sec = pri + 20;
387 }
388
389 if ((pri < affected_start || pri > affected_end) &&
390 (sec < affected_start || sec > affected_end))
391 continue; /* not within affected channel range */
392
393 wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
394 " freq=%d pri=%d sec=%d",
395 MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
396
397 if (sec_chan) {
398 if (pri_freq != pri || sec_freq != sec) {
399 wpa_printf(MSG_DEBUG, "40 MHz pri/sec "
400 "mismatch with BSS " MACSTR
401 " <%d,%d> (chan=%d%c) vs. <%d,%d>",
402 MAC2STR(bss->bssid),
403 pri, sec, pri_chan,
404 sec > pri ? '+' : '-',
405 pri_freq, sec_freq);
406 return 0;
407 }
408 }
409
410 /* TODO: 40 MHz intolerant */
411 }
412
413 return 1;
414 }
415
416
ieee80211n_check_scan(struct hostapd_iface * iface)417 static void ieee80211n_check_scan(struct hostapd_iface *iface)
418 {
419 struct wpa_scan_results *scan_res;
420 int oper40;
421 int res;
422
423 /* Check list of neighboring BSSes (from scan) to see whether 40 MHz is
424 * allowed per IEEE Std 802.11-2012, 10.15.3.2 */
425
426 iface->scan_cb = NULL;
427
428 scan_res = hostapd_driver_get_scan_results(iface->bss[0]);
429 if (scan_res == NULL) {
430 hostapd_setup_interface_complete(iface, 1);
431 return;
432 }
433
434 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211A)
435 oper40 = ieee80211n_check_40mhz_5g(iface, scan_res);
436 else
437 oper40 = ieee80211n_check_40mhz_2g4(iface, scan_res);
438 wpa_scan_results_free(scan_res);
439
440 if (!oper40) {
441 wpa_printf(MSG_INFO, "20/40 MHz operation not permitted on "
442 "channel pri=%d sec=%d based on overlapping BSSes",
443 iface->conf->channel,
444 iface->conf->channel +
445 iface->conf->secondary_channel * 4);
446 iface->conf->secondary_channel = 0;
447 }
448
449 res = ieee80211n_allowed_ht40_channel_pair(iface);
450 hostapd_setup_interface_complete(iface, !res);
451 }
452
453
ieee80211n_scan_channels_2g4(struct hostapd_iface * iface,struct wpa_driver_scan_params * params)454 static void ieee80211n_scan_channels_2g4(struct hostapd_iface *iface,
455 struct wpa_driver_scan_params *params)
456 {
457 /* Scan only the affected frequency range */
458 int pri_freq, sec_freq;
459 int affected_start, affected_end;
460 int i, pos;
461 struct hostapd_hw_modes *mode;
462
463 if (iface->current_mode == NULL)
464 return;
465
466 pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
467 if (iface->conf->secondary_channel > 0)
468 sec_freq = pri_freq + 20;
469 else
470 sec_freq = pri_freq - 20;
471 affected_start = (pri_freq + sec_freq) / 2 - 25;
472 affected_end = (pri_freq + sec_freq) / 2 + 25;
473 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
474 affected_start, affected_end);
475
476 mode = iface->current_mode;
477 params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
478 if (params->freqs == NULL)
479 return;
480 pos = 0;
481
482 for (i = 0; i < mode->num_channels; i++) {
483 struct hostapd_channel_data *chan = &mode->channels[i];
484 if (chan->flag & HOSTAPD_CHAN_DISABLED)
485 continue;
486 if (chan->freq < affected_start ||
487 chan->freq > affected_end)
488 continue;
489 params->freqs[pos++] = chan->freq;
490 }
491 }
492
493
ieee80211n_check_40mhz(struct hostapd_iface * iface)494 static int ieee80211n_check_40mhz(struct hostapd_iface *iface)
495 {
496 struct wpa_driver_scan_params params;
497
498 if (!iface->conf->secondary_channel)
499 return 0; /* HT40 not used */
500
501 wpa_printf(MSG_DEBUG, "Scan for neighboring BSSes prior to enabling "
502 "40 MHz channel");
503 os_memset(¶ms, 0, sizeof(params));
504 if (iface->current_mode->mode == HOSTAPD_MODE_IEEE80211G)
505 ieee80211n_scan_channels_2g4(iface, ¶ms);
506 if (hostapd_driver_scan(iface->bss[0], ¶ms) < 0) {
507 wpa_printf(MSG_ERROR, "Failed to request a scan of "
508 "neighboring BSSes");
509 os_free(params.freqs);
510 return -1;
511 }
512 os_free(params.freqs);
513
514 iface->scan_cb = ieee80211n_check_scan;
515 return 1;
516 }
517
518
ieee80211n_supported_ht_capab(struct hostapd_iface * iface)519 static int ieee80211n_supported_ht_capab(struct hostapd_iface *iface)
520 {
521 u16 hw = iface->current_mode->ht_capab;
522 u16 conf = iface->conf->ht_capab;
523
524 if ((conf & HT_CAP_INFO_LDPC_CODING_CAP) &&
525 !(hw & HT_CAP_INFO_LDPC_CODING_CAP)) {
526 wpa_printf(MSG_ERROR, "Driver does not support configured "
527 "HT capability [LDPC]");
528 return 0;
529 }
530
531 if ((conf & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
532 !(hw & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
533 wpa_printf(MSG_ERROR, "Driver does not support configured "
534 "HT capability [HT40*]");
535 return 0;
536 }
537
538 if ((conf & HT_CAP_INFO_SMPS_MASK) != (hw & HT_CAP_INFO_SMPS_MASK) &&
539 (conf & HT_CAP_INFO_SMPS_MASK) != HT_CAP_INFO_SMPS_DISABLED) {
540 wpa_printf(MSG_ERROR, "Driver does not support configured "
541 "HT capability [SMPS-*]");
542 return 0;
543 }
544
545 if ((conf & HT_CAP_INFO_GREEN_FIELD) &&
546 !(hw & HT_CAP_INFO_GREEN_FIELD)) {
547 wpa_printf(MSG_ERROR, "Driver does not support configured "
548 "HT capability [GF]");
549 return 0;
550 }
551
552 if ((conf & HT_CAP_INFO_SHORT_GI20MHZ) &&
553 !(hw & HT_CAP_INFO_SHORT_GI20MHZ)) {
554 wpa_printf(MSG_ERROR, "Driver does not support configured "
555 "HT capability [SHORT-GI-20]");
556 return 0;
557 }
558
559 if ((conf & HT_CAP_INFO_SHORT_GI40MHZ) &&
560 !(hw & HT_CAP_INFO_SHORT_GI40MHZ)) {
561 wpa_printf(MSG_ERROR, "Driver does not support configured "
562 "HT capability [SHORT-GI-40]");
563 return 0;
564 }
565
566 if ((conf & HT_CAP_INFO_TX_STBC) && !(hw & HT_CAP_INFO_TX_STBC)) {
567 wpa_printf(MSG_ERROR, "Driver does not support configured "
568 "HT capability [TX-STBC]");
569 return 0;
570 }
571
572 if ((conf & HT_CAP_INFO_RX_STBC_MASK) >
573 (hw & HT_CAP_INFO_RX_STBC_MASK)) {
574 wpa_printf(MSG_ERROR, "Driver does not support configured "
575 "HT capability [RX-STBC*]");
576 return 0;
577 }
578
579 if ((conf & HT_CAP_INFO_DELAYED_BA) &&
580 !(hw & HT_CAP_INFO_DELAYED_BA)) {
581 wpa_printf(MSG_ERROR, "Driver does not support configured "
582 "HT capability [DELAYED-BA]");
583 return 0;
584 }
585
586 if ((conf & HT_CAP_INFO_MAX_AMSDU_SIZE) &&
587 !(hw & HT_CAP_INFO_MAX_AMSDU_SIZE)) {
588 wpa_printf(MSG_ERROR, "Driver does not support configured "
589 "HT capability [MAX-AMSDU-7935]");
590 return 0;
591 }
592
593 if ((conf & HT_CAP_INFO_DSSS_CCK40MHZ) &&
594 !(hw & HT_CAP_INFO_DSSS_CCK40MHZ)) {
595 wpa_printf(MSG_ERROR, "Driver does not support configured "
596 "HT capability [DSSS_CCK-40]");
597 return 0;
598 }
599
600 if ((conf & HT_CAP_INFO_PSMP_SUPP) && !(hw & HT_CAP_INFO_PSMP_SUPP)) {
601 wpa_printf(MSG_ERROR, "Driver does not support configured "
602 "HT capability [PSMP]");
603 return 0;
604 }
605
606 if ((conf & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT) &&
607 !(hw & HT_CAP_INFO_LSIG_TXOP_PROTECT_SUPPORT)) {
608 wpa_printf(MSG_ERROR, "Driver does not support configured "
609 "HT capability [LSIG-TXOP-PROT]");
610 return 0;
611 }
612
613 return 1;
614 }
615
616 #endif /* CONFIG_IEEE80211N */
617
618
hostapd_check_ht_capab(struct hostapd_iface * iface)619 int hostapd_check_ht_capab(struct hostapd_iface *iface)
620 {
621 #ifdef CONFIG_IEEE80211N
622 int ret;
623 if (!iface->conf->ieee80211n)
624 return 0;
625 if (!ieee80211n_supported_ht_capab(iface))
626 return -1;
627 ret = ieee80211n_check_40mhz(iface);
628 if (ret)
629 return ret;
630 if (!ieee80211n_allowed_ht40_channel_pair(iface))
631 return -1;
632 #endif /* CONFIG_IEEE80211N */
633
634 return 0;
635 }
636
637
hostapd_is_usable_chan(struct hostapd_iface * iface,int channel,int primary)638 static int hostapd_is_usable_chan(struct hostapd_iface *iface,
639 int channel, int primary)
640 {
641 int i;
642 struct hostapd_channel_data *chan;
643
644 for (i = 0; i < iface->current_mode->num_channels; i++) {
645 chan = &iface->current_mode->channels[i];
646 if (chan->chan != channel)
647 continue;
648
649 if (!(chan->flag & HOSTAPD_CHAN_DISABLED))
650 return 1;
651
652 wpa_printf(MSG_DEBUG,
653 "%schannel [%i] (%i) is disabled for use in AP mode, flags: 0x%x%s%s%s",
654 primary ? "" : "Configured HT40 secondary ",
655 i, chan->chan, chan->flag,
656 chan->flag & HOSTAPD_CHAN_NO_IBSS ? " NO-IBSS" : "",
657 chan->flag & HOSTAPD_CHAN_PASSIVE_SCAN ?
658 " PASSIVE-SCAN" : "",
659 chan->flag & HOSTAPD_CHAN_RADAR ? " RADAR" : "");
660 }
661
662 return 0;
663 }
664
665
hostapd_is_usable_chans(struct hostapd_iface * iface)666 static int hostapd_is_usable_chans(struct hostapd_iface *iface)
667 {
668 if (!hostapd_is_usable_chan(iface, iface->conf->channel, 1))
669 return 0;
670
671 if (!iface->conf->secondary_channel)
672 return 1;
673
674 return hostapd_is_usable_chan(iface, iface->conf->channel +
675 iface->conf->secondary_channel * 4, 0);
676 }
677
678
679 static enum hostapd_chan_status
hostapd_check_chans(struct hostapd_iface * iface)680 hostapd_check_chans(struct hostapd_iface *iface)
681 {
682 if (iface->conf->channel) {
683 if (hostapd_is_usable_chans(iface))
684 return HOSTAPD_CHAN_VALID;
685 else
686 return HOSTAPD_CHAN_INVALID;
687 }
688
689 /*
690 * The user set channel=0 or channel=acs_survey
691 * which is used to trigger ACS.
692 */
693
694 switch (acs_init(iface)) {
695 case HOSTAPD_CHAN_ACS:
696 return HOSTAPD_CHAN_ACS;
697 case HOSTAPD_CHAN_VALID:
698 case HOSTAPD_CHAN_INVALID:
699 default:
700 return HOSTAPD_CHAN_INVALID;
701 }
702 }
703
704
hostapd_notify_bad_chans(struct hostapd_iface * iface)705 static void hostapd_notify_bad_chans(struct hostapd_iface *iface)
706 {
707 hostapd_logger(iface->bss[0], NULL,
708 HOSTAPD_MODULE_IEEE80211,
709 HOSTAPD_LEVEL_WARNING,
710 "Configured channel (%d) not found from the "
711 "channel list of current mode (%d) %s",
712 iface->conf->channel,
713 iface->current_mode->mode,
714 hostapd_hw_mode_txt(iface->current_mode->mode));
715 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
716 HOSTAPD_LEVEL_WARNING,
717 "Hardware does not support configured channel");
718 }
719
720
hostapd_acs_completed(struct hostapd_iface * iface)721 int hostapd_acs_completed(struct hostapd_iface *iface)
722 {
723 int ret;
724
725 switch (hostapd_check_chans(iface)) {
726 case HOSTAPD_CHAN_VALID:
727 break;
728 case HOSTAPD_CHAN_ACS:
729 wpa_printf(MSG_ERROR, "ACS error - reported complete, but no result available");
730 hostapd_notify_bad_chans(iface);
731 return -1;
732 case HOSTAPD_CHAN_INVALID:
733 default:
734 wpa_printf(MSG_ERROR, "ACS picked unusable channels");
735 hostapd_notify_bad_chans(iface);
736 return -1;
737 }
738
739 ret = hostapd_check_ht_capab(iface);
740 if (ret < 0)
741 return -1;
742 if (ret == 1) {
743 wpa_printf(MSG_DEBUG, "Interface initialization will be completed in a callback");
744 return 0;
745 }
746
747 return hostapd_setup_interface_complete(iface, 0);
748 }
749
750
751 /**
752 * hostapd_select_hw_mode - Select the hardware mode
753 * @iface: Pointer to interface data.
754 * Returns: 0 on success, < 0 on failure
755 *
756 * Sets up the hardware mode, channel, rates, and passive scanning
757 * based on the configuration.
758 */
hostapd_select_hw_mode(struct hostapd_iface * iface)759 int hostapd_select_hw_mode(struct hostapd_iface *iface)
760 {
761 int i;
762
763 if (iface->num_hw_features < 1)
764 return -1;
765
766 iface->current_mode = NULL;
767 for (i = 0; i < iface->num_hw_features; i++) {
768 struct hostapd_hw_modes *mode = &iface->hw_features[i];
769 if (mode->mode == iface->conf->hw_mode) {
770 iface->current_mode = mode;
771 break;
772 }
773 }
774
775 if (iface->current_mode == NULL) {
776 wpa_printf(MSG_ERROR, "Hardware does not support configured "
777 "mode");
778 hostapd_logger(iface->bss[0], NULL, HOSTAPD_MODULE_IEEE80211,
779 HOSTAPD_LEVEL_WARNING,
780 "Hardware does not support configured mode "
781 "(%d) (hw_mode in hostapd.conf)",
782 (int) iface->conf->hw_mode);
783 return -2;
784 }
785
786 switch (hostapd_check_chans(iface)) {
787 case HOSTAPD_CHAN_VALID:
788 return 0;
789 case HOSTAPD_CHAN_ACS: /* ACS will run and later complete */
790 return 1;
791 case HOSTAPD_CHAN_INVALID:
792 default:
793 hostapd_notify_bad_chans(iface);
794 return -3;
795 }
796
797 return 0;
798 }
799
800
hostapd_hw_mode_txt(int mode)801 const char * hostapd_hw_mode_txt(int mode)
802 {
803 switch (mode) {
804 case HOSTAPD_MODE_IEEE80211A:
805 return "IEEE 802.11a";
806 case HOSTAPD_MODE_IEEE80211B:
807 return "IEEE 802.11b";
808 case HOSTAPD_MODE_IEEE80211G:
809 return "IEEE 802.11g";
810 case HOSTAPD_MODE_IEEE80211AD:
811 return "IEEE 802.11ad";
812 default:
813 return "UNKNOWN";
814 }
815 }
816
817
hostapd_hw_get_freq(struct hostapd_data * hapd,int chan)818 int hostapd_hw_get_freq(struct hostapd_data *hapd, int chan)
819 {
820 int i;
821
822 if (!hapd->iface->current_mode)
823 return 0;
824
825 for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
826 struct hostapd_channel_data *ch =
827 &hapd->iface->current_mode->channels[i];
828 if (ch->chan == chan)
829 return ch->freq;
830 }
831
832 return 0;
833 }
834
835
hostapd_hw_get_channel(struct hostapd_data * hapd,int freq)836 int hostapd_hw_get_channel(struct hostapd_data *hapd, int freq)
837 {
838 int i;
839
840 if (!hapd->iface->current_mode)
841 return 0;
842
843 for (i = 0; i < hapd->iface->current_mode->num_channels; i++) {
844 struct hostapd_channel_data *ch =
845 &hapd->iface->current_mode->channels[i];
846 if (ch->freq == freq)
847 return ch->chan;
848 }
849
850 return 0;
851 }
852