1 /*
2 * Common hostapd/wpa_supplicant HW features
3 * Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
4 * Copyright (c) 2015, Qualcomm Atheros, Inc.
5 *
6 * This software may be distributed under the terms of the BSD license.
7 * See README for more details.
8 */
9
10 #include "includes.h"
11
12 #include "common.h"
13 #include "defs.h"
14 #include "ieee802_11_defs.h"
15 #include "ieee802_11_common.h"
16 #include "hw_features_common.h"
17
18
hw_get_channel_chan(struct hostapd_hw_modes * mode,int chan,int * freq)19 struct hostapd_channel_data * hw_get_channel_chan(struct hostapd_hw_modes *mode,
20 int chan, int *freq)
21 {
22 int i;
23
24 if (freq)
25 *freq = 0;
26
27 if (!mode)
28 return NULL;
29
30 for (i = 0; i < mode->num_channels; i++) {
31 struct hostapd_channel_data *ch = &mode->channels[i];
32 if (ch->chan == chan) {
33 if (freq)
34 *freq = ch->freq;
35 return ch;
36 }
37 }
38
39 return NULL;
40 }
41
42
43 struct hostapd_channel_data *
hw_mode_get_channel(struct hostapd_hw_modes * mode,int freq,int * chan)44 hw_mode_get_channel(struct hostapd_hw_modes *mode, int freq, int *chan)
45 {
46 int i;
47
48 for (i = 0; i < mode->num_channels; i++) {
49 struct hostapd_channel_data *ch = &mode->channels[i];
50
51 if (ch->freq == freq) {
52 if (chan)
53 *chan = ch->chan;
54 return ch;
55 }
56 }
57
58 return NULL;
59 }
60
61
62 struct hostapd_channel_data *
hw_get_channel_freq(enum hostapd_hw_mode mode,int freq,int * chan,struct hostapd_hw_modes * hw_features,int num_hw_features)63 hw_get_channel_freq(enum hostapd_hw_mode mode, int freq, int *chan,
64 struct hostapd_hw_modes *hw_features, int num_hw_features)
65 {
66 struct hostapd_channel_data *chan_data;
67 int i;
68
69 if (chan)
70 *chan = 0;
71
72 if (!hw_features)
73 return NULL;
74
75 for (i = 0; i < num_hw_features; i++) {
76 struct hostapd_hw_modes *curr_mode = &hw_features[i];
77
78 if (curr_mode->mode != mode)
79 continue;
80
81 chan_data = hw_mode_get_channel(curr_mode, freq, chan);
82 if (chan_data)
83 return chan_data;
84 }
85
86 return NULL;
87 }
88
89
hw_get_freq(struct hostapd_hw_modes * mode,int chan)90 int hw_get_freq(struct hostapd_hw_modes *mode, int chan)
91 {
92 int freq;
93
94 hw_get_channel_chan(mode, chan, &freq);
95
96 return freq;
97 }
98
99
hw_get_chan(enum hostapd_hw_mode mode,int freq,struct hostapd_hw_modes * hw_features,int num_hw_features)100 int hw_get_chan(enum hostapd_hw_mode mode, int freq,
101 struct hostapd_hw_modes *hw_features, int num_hw_features)
102 {
103 int chan;
104
105 hw_get_channel_freq(mode, freq, &chan, hw_features, num_hw_features);
106
107 return chan;
108 }
109
110
allowed_ht40_channel_pair(enum hostapd_hw_mode mode,struct hostapd_channel_data * p_chan,struct hostapd_channel_data * s_chan)111 int allowed_ht40_channel_pair(enum hostapd_hw_mode mode,
112 struct hostapd_channel_data *p_chan,
113 struct hostapd_channel_data *s_chan)
114 {
115 int ok, first;
116 int allowed[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 140,
117 149, 157, 165, 173, 184, 192 };
118 size_t k;
119 int ht40_plus, pri_chan, sec_chan;
120
121 if (!p_chan || !s_chan)
122 return 0;
123 pri_chan = p_chan->chan;
124 sec_chan = s_chan->chan;
125
126 ht40_plus = pri_chan < sec_chan;
127
128 if (pri_chan == sec_chan || !sec_chan) {
129 if (chan_pri_allowed(p_chan))
130 return 1; /* HT40 not used */
131
132 wpa_printf(MSG_ERROR, "Channel %d is not allowed as primary",
133 pri_chan);
134 return 0;
135 }
136
137 wpa_printf(MSG_DEBUG,
138 "HT40: control channel: %d (%d MHz), secondary channel: %d (%d MHz)",
139 pri_chan, p_chan->freq, sec_chan, s_chan->freq);
140
141 /* Verify that HT40 secondary channel is an allowed 20 MHz
142 * channel */
143 if ((s_chan->flag & HOSTAPD_CHAN_DISABLED) ||
144 (ht40_plus && !(p_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P)) ||
145 (!ht40_plus && !(p_chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40M))) {
146 wpa_printf(MSG_ERROR, "HT40 secondary channel %d not allowed",
147 sec_chan);
148 return 0;
149 }
150
151 /*
152 * Verify that HT40 primary,secondary channel pair is allowed per
153 * IEEE 802.11n Annex J. This is only needed for 5 GHz band since
154 * 2.4 GHz rules allow all cases where the secondary channel fits into
155 * the list of allowed channels (already checked above).
156 */
157 if (mode != HOSTAPD_MODE_IEEE80211A)
158 return 1;
159
160 first = pri_chan < sec_chan ? pri_chan : sec_chan;
161
162 ok = 0;
163 for (k = 0; k < ARRAY_SIZE(allowed); k++) {
164 if (first == allowed[k]) {
165 ok = 1;
166 break;
167 }
168 }
169 if (!ok) {
170 wpa_printf(MSG_ERROR, "HT40 channel pair (%d, %d) not allowed",
171 pri_chan, sec_chan);
172 return 0;
173 }
174
175 return 1;
176 }
177
178
get_pri_sec_chan(struct wpa_scan_res * bss,int * pri_chan,int * sec_chan)179 void get_pri_sec_chan(struct wpa_scan_res *bss, int *pri_chan, int *sec_chan)
180 {
181 struct ieee80211_ht_operation *oper;
182 struct ieee802_11_elems elems;
183
184 *pri_chan = *sec_chan = 0;
185
186 ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
187 if (elems.ht_operation) {
188 oper = (struct ieee80211_ht_operation *) elems.ht_operation;
189 *pri_chan = oper->primary_chan;
190 if (oper->ht_param & HT_INFO_HT_PARAM_STA_CHNL_WIDTH) {
191 int sec = oper->ht_param &
192 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
193 if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
194 *sec_chan = *pri_chan + 4;
195 else if (sec == HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
196 *sec_chan = *pri_chan - 4;
197 }
198 }
199 }
200
201
check_40mhz_5g(struct wpa_scan_results * scan_res,struct hostapd_channel_data * pri_chan,struct hostapd_channel_data * sec_chan)202 int check_40mhz_5g(struct wpa_scan_results *scan_res,
203 struct hostapd_channel_data *pri_chan,
204 struct hostapd_channel_data *sec_chan)
205 {
206 int pri_bss, sec_bss;
207 int bss_pri_chan, bss_sec_chan;
208 size_t i;
209 int match;
210
211 if (!scan_res || !pri_chan || !sec_chan ||
212 pri_chan->freq == sec_chan->freq)
213 return 0;
214
215 /*
216 * Switch PRI/SEC channels if Beacons were detected on selected SEC
217 * channel, but not on selected PRI channel.
218 */
219 pri_bss = sec_bss = 0;
220 for (i = 0; i < scan_res->num; i++) {
221 struct wpa_scan_res *bss = scan_res->res[i];
222 if (bss->freq == pri_chan->freq)
223 pri_bss++;
224 else if (bss->freq == sec_chan->freq)
225 sec_bss++;
226 }
227 if (sec_bss && !pri_bss) {
228 wpa_printf(MSG_INFO,
229 "Switch own primary and secondary channel to get secondary channel with no Beacons from other BSSes");
230 return 2;
231 }
232
233 /*
234 * Match PRI/SEC channel with any existing HT40 BSS on the same
235 * channels that we are about to use (if already mixed order in
236 * existing BSSes, use own preference).
237 */
238 match = 0;
239 for (i = 0; i < scan_res->num; i++) {
240 struct wpa_scan_res *bss = scan_res->res[i];
241 get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
242 if (pri_chan->chan == bss_pri_chan &&
243 sec_chan->chan == bss_sec_chan) {
244 match = 1;
245 break;
246 }
247 }
248 if (!match) {
249 for (i = 0; i < scan_res->num; i++) {
250 struct wpa_scan_res *bss = scan_res->res[i];
251 get_pri_sec_chan(bss, &bss_pri_chan, &bss_sec_chan);
252 if (pri_chan->chan == bss_sec_chan &&
253 sec_chan->chan == bss_pri_chan) {
254 wpa_printf(MSG_INFO, "Switch own primary and "
255 "secondary channel due to BSS "
256 "overlap with " MACSTR,
257 MAC2STR(bss->bssid));
258 return 2;
259 }
260 }
261 }
262
263 return 1;
264 }
265
266
check_20mhz_bss(struct wpa_scan_res * bss,int pri_freq,int start,int end)267 static int check_20mhz_bss(struct wpa_scan_res *bss, int pri_freq, int start,
268 int end)
269 {
270 struct ieee802_11_elems elems;
271 struct ieee80211_ht_operation *oper;
272
273 if (bss->freq < start || bss->freq > end || bss->freq == pri_freq)
274 return 0;
275
276 ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems, 0);
277 if (!elems.ht_capabilities) {
278 wpa_printf(MSG_DEBUG, "Found overlapping legacy BSS: "
279 MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
280 return 1;
281 }
282
283 if (elems.ht_operation) {
284 oper = (struct ieee80211_ht_operation *) elems.ht_operation;
285 if (oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)
286 return 0;
287
288 wpa_printf(MSG_DEBUG, "Found overlapping 20 MHz HT BSS: "
289 MACSTR " freq=%d", MAC2STR(bss->bssid), bss->freq);
290 return 1;
291 }
292 return 0;
293 }
294
295
check_40mhz_2g4(struct hostapd_hw_modes * mode,struct wpa_scan_results * scan_res,int pri_chan,int sec_chan)296 int check_40mhz_2g4(struct hostapd_hw_modes *mode,
297 struct wpa_scan_results *scan_res, int pri_chan,
298 int sec_chan)
299 {
300 int pri_freq, sec_freq;
301 int affected_start, affected_end;
302 size_t i;
303
304 if (!mode || !scan_res || !pri_chan || !sec_chan ||
305 pri_chan == sec_chan)
306 return 0;
307
308 pri_freq = hw_get_freq(mode, pri_chan);
309 sec_freq = hw_get_freq(mode, sec_chan);
310
311 affected_start = (pri_freq + sec_freq) / 2 - 25;
312 affected_end = (pri_freq + sec_freq) / 2 + 25;
313 wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
314 affected_start, affected_end);
315 for (i = 0; i < scan_res->num; i++) {
316 struct wpa_scan_res *bss = scan_res->res[i];
317 int pri = bss->freq;
318 int sec = pri;
319 struct ieee802_11_elems elems;
320
321 /* Check for overlapping 20 MHz BSS */
322 if (check_20mhz_bss(bss, pri_freq, affected_start,
323 affected_end)) {
324 wpa_printf(MSG_DEBUG,
325 "Overlapping 20 MHz BSS is found");
326 return 0;
327 }
328
329 get_pri_sec_chan(bss, &pri_chan, &sec_chan);
330
331 if (sec_chan) {
332 if (sec_chan < pri_chan)
333 sec = pri - 20;
334 else
335 sec = pri + 20;
336 }
337
338 if ((pri < affected_start || pri > affected_end) &&
339 (sec < affected_start || sec > affected_end))
340 continue; /* not within affected channel range */
341
342 wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
343 " freq=%d pri=%d sec=%d",
344 MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
345
346 if (sec_chan) {
347 if (pri_freq != pri || sec_freq != sec) {
348 wpa_printf(MSG_DEBUG,
349 "40 MHz pri/sec mismatch with BSS "
350 MACSTR
351 " <%d,%d> (chan=%d%c) vs. <%d,%d>",
352 MAC2STR(bss->bssid),
353 pri, sec, pri_chan,
354 sec > pri ? '+' : '-',
355 pri_freq, sec_freq);
356 return 0;
357 }
358 }
359
360 ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems,
361 0);
362 if (elems.ht_capabilities) {
363 struct ieee80211_ht_capabilities *ht_cap =
364 (struct ieee80211_ht_capabilities *)
365 elems.ht_capabilities;
366
367 if (le_to_host16(ht_cap->ht_capabilities_info) &
368 HT_CAP_INFO_40MHZ_INTOLERANT) {
369 wpa_printf(MSG_DEBUG,
370 "40 MHz Intolerant is set on channel %d in BSS "
371 MACSTR, pri, MAC2STR(bss->bssid));
372 return 0;
373 }
374 }
375 }
376
377 return 1;
378 }
379
380
hostapd_set_freq_params(struct hostapd_freq_params * data,enum hostapd_hw_mode mode,int freq,int channel,int enable_edmg,u8 edmg_channel,int ht_enabled,int vht_enabled,int he_enabled,int sec_channel_offset,int oper_chwidth,int center_segment0,int center_segment1,u32 vht_caps,struct he_capabilities * he_cap)381 int hostapd_set_freq_params(struct hostapd_freq_params *data,
382 enum hostapd_hw_mode mode,
383 int freq, int channel, int enable_edmg,
384 u8 edmg_channel, int ht_enabled,
385 int vht_enabled, int he_enabled,
386 int sec_channel_offset,
387 int oper_chwidth, int center_segment0,
388 int center_segment1, u32 vht_caps,
389 struct he_capabilities *he_cap)
390 {
391 if (!he_cap || !he_cap->he_supported)
392 he_enabled = 0;
393 os_memset(data, 0, sizeof(*data));
394 data->mode = mode;
395 data->freq = freq;
396 data->channel = channel;
397 data->ht_enabled = ht_enabled;
398 data->vht_enabled = vht_enabled;
399 data->he_enabled = he_enabled;
400 data->sec_channel_offset = sec_channel_offset;
401 data->center_freq1 = freq + sec_channel_offset * 10;
402 data->center_freq2 = 0;
403 if (oper_chwidth == CHANWIDTH_80MHZ)
404 data->bandwidth = 80;
405 else if (oper_chwidth == CHANWIDTH_160MHZ ||
406 oper_chwidth == CHANWIDTH_80P80MHZ)
407 data->bandwidth = 160;
408 else if (sec_channel_offset)
409 data->bandwidth = 40;
410 else
411 data->bandwidth = 20;
412
413
414 hostapd_encode_edmg_chan(enable_edmg, edmg_channel, channel,
415 &data->edmg);
416
417 if (is_6ghz_freq(freq)) {
418 if (!data->he_enabled) {
419 wpa_printf(MSG_ERROR,
420 "Can't set 6 GHz mode - HE isn't enabled");
421 return -1;
422 }
423
424 if (center_idx_to_bw_6ghz(channel) < 0) {
425 wpa_printf(MSG_ERROR,
426 "Invalid control channel for 6 GHz band");
427 return -1;
428 }
429
430 if (!center_segment0) {
431 if (center_segment1) {
432 wpa_printf(MSG_ERROR,
433 "Segment 0 center frequency isn't set");
434 return -1;
435 }
436 if (!sec_channel_offset)
437 data->center_freq1 = data->freq;
438 } else {
439 int freq1, freq2 = 0;
440 int bw = center_idx_to_bw_6ghz(center_segment0);
441
442 if (bw < 0) {
443 wpa_printf(MSG_ERROR,
444 "Invalid center frequency index for 6 GHz");
445 return -1;
446 }
447
448 freq1 = ieee80211_chan_to_freq(NULL, 131,
449 center_segment0);
450 if (freq1 < 0) {
451 wpa_printf(MSG_ERROR,
452 "Invalid segment 0 center frequency for 6 GHz");
453 return -1;
454 }
455
456 if (center_segment1) {
457 if (center_idx_to_bw_6ghz(center_segment1) != 2 ||
458 bw != 2) {
459 wpa_printf(MSG_ERROR,
460 "6 GHz 80+80 MHz configuration doesn't use valid 80 MHz channels");
461 return -1;
462 }
463
464 freq2 = ieee80211_chan_to_freq(NULL, 131,
465 center_segment1);
466 if (freq2 < 0) {
467 wpa_printf(MSG_ERROR,
468 "Invalid segment 1 center frequency for UHB");
469 return -1;
470 }
471 }
472
473 data->bandwidth = (1 << (u8) bw) * 20;
474 data->center_freq1 = freq1;
475 data->center_freq2 = freq2;
476 }
477 data->ht_enabled = 0;
478 data->vht_enabled = 0;
479
480 return 0;
481 }
482
483 if (data->he_enabled) switch (oper_chwidth) {
484 case CHANWIDTH_USE_HT:
485 if (sec_channel_offset == 0)
486 break;
487
488 if (mode == HOSTAPD_MODE_IEEE80211G) {
489 if (!(he_cap->phy_cap[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &
490 HE_PHYCAP_CHANNEL_WIDTH_SET_40MHZ_IN_2G)) {
491 wpa_printf(MSG_ERROR,
492 "40 MHz channel width is not supported in 2.4 GHz");
493 return -1;
494 }
495 break;
496 }
497 /* fall through */
498 case CHANWIDTH_80MHZ:
499 if (mode == HOSTAPD_MODE_IEEE80211A) {
500 if (!(he_cap->phy_cap[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &
501 HE_PHYCAP_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G)) {
502 wpa_printf(MSG_ERROR,
503 "40/80 MHz channel width is not supported in 5/6 GHz");
504 return -1;
505 }
506 }
507 break;
508 case CHANWIDTH_80P80MHZ:
509 if (!(he_cap->phy_cap[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &
510 HE_PHYCAP_CHANNEL_WIDTH_SET_80PLUS80MHZ_IN_5G)) {
511 wpa_printf(MSG_ERROR,
512 "80+80 MHz channel width is not supported in 5/6 GHz");
513 return -1;
514 }
515 break;
516 case CHANWIDTH_160MHZ:
517 if (!(he_cap->phy_cap[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &
518 HE_PHYCAP_CHANNEL_WIDTH_SET_160MHZ_IN_5G)) {
519 wpa_printf(MSG_ERROR,
520 "160 MHz channel width is not supported in 5 / 6GHz");
521 return -1;
522 }
523 break;
524 } else if (data->vht_enabled) switch (oper_chwidth) {
525 case CHANWIDTH_USE_HT:
526 break;
527 case CHANWIDTH_80P80MHZ:
528 if (!(vht_caps & VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)) {
529 wpa_printf(MSG_ERROR,
530 "80+80 channel width is not supported!");
531 return -1;
532 }
533 /* fall through */
534 case CHANWIDTH_80MHZ:
535 break;
536 case CHANWIDTH_160MHZ:
537 if (!(vht_caps & (VHT_CAP_SUPP_CHAN_WIDTH_160MHZ |
538 VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))) {
539 wpa_printf(MSG_ERROR,
540 "160 MHz channel width is not supported!");
541 return -1;
542 }
543 break;
544 }
545
546 if (data->he_enabled || data->vht_enabled) switch (oper_chwidth) {
547 case CHANWIDTH_USE_HT:
548 if (center_segment1 ||
549 (center_segment0 != 0 &&
550 5000 + center_segment0 * 5 != data->center_freq1 &&
551 2407 + center_segment0 * 5 != data->center_freq1)) {
552 wpa_printf(MSG_ERROR,
553 "20/40 MHz: center segment 0 (=%d) and center freq 1 (=%d) not in sync",
554 center_segment0, data->center_freq1);
555 return -1;
556 }
557 break;
558 case CHANWIDTH_80P80MHZ:
559 if (center_segment1 == center_segment0 + 4 ||
560 center_segment1 == center_segment0 - 4) {
561 wpa_printf(MSG_ERROR,
562 "80+80 MHz: center segment 1 only 20 MHz apart");
563 return -1;
564 }
565 data->center_freq2 = 5000 + center_segment1 * 5;
566 /* fall through */
567 case CHANWIDTH_80MHZ:
568 data->bandwidth = 80;
569 if (!sec_channel_offset) {
570 wpa_printf(MSG_ERROR,
571 "80/80+80 MHz: no second channel offset");
572 return -1;
573 }
574 if (oper_chwidth == CHANWIDTH_80MHZ && center_segment1) {
575 wpa_printf(MSG_ERROR,
576 "80 MHz: center segment 1 configured");
577 return -1;
578 }
579 if (oper_chwidth == CHANWIDTH_80P80MHZ && !center_segment1) {
580 wpa_printf(MSG_ERROR,
581 "80+80 MHz: center segment 1 not configured");
582 return -1;
583 }
584 if (!center_segment0) {
585 if (channel <= 48)
586 center_segment0 = 42;
587 else if (channel <= 64)
588 center_segment0 = 58;
589 else if (channel <= 112)
590 center_segment0 = 106;
591 else if (channel <= 128)
592 center_segment0 = 122;
593 else if (channel <= 144)
594 center_segment0 = 138;
595 else if (channel <= 161)
596 center_segment0 = 155;
597 else if (channel <= 177)
598 center_segment0 = 171;
599 data->center_freq1 = 5000 + center_segment0 * 5;
600 } else {
601 /*
602 * Note: HT/VHT config and params are coupled. Check if
603 * HT40 channel band is in VHT80 Pri channel band
604 * configuration.
605 */
606 if (center_segment0 == channel + 6 ||
607 center_segment0 == channel + 2 ||
608 center_segment0 == channel - 2 ||
609 center_segment0 == channel - 6)
610 data->center_freq1 = 5000 + center_segment0 * 5;
611 else {
612 wpa_printf(MSG_ERROR,
613 "Wrong coupling between HT and VHT/HE channel setting");
614 return -1;
615 }
616 }
617 break;
618 case CHANWIDTH_160MHZ:
619 data->bandwidth = 160;
620 if (center_segment1) {
621 wpa_printf(MSG_ERROR,
622 "160 MHz: center segment 1 should not be set");
623 return -1;
624 }
625 if (!sec_channel_offset) {
626 wpa_printf(MSG_ERROR,
627 "160 MHz: second channel offset not set");
628 return -1;
629 }
630 /*
631 * Note: HT/VHT config and params are coupled. Check if
632 * HT40 channel band is in VHT160 channel band configuration.
633 */
634 if (center_segment0 == channel + 14 ||
635 center_segment0 == channel + 10 ||
636 center_segment0 == channel + 6 ||
637 center_segment0 == channel + 2 ||
638 center_segment0 == channel - 2 ||
639 center_segment0 == channel - 6 ||
640 center_segment0 == channel - 10 ||
641 center_segment0 == channel - 14)
642 data->center_freq1 = 5000 + center_segment0 * 5;
643 else {
644 wpa_printf(MSG_ERROR,
645 "160 MHz: HT40 channel band is not in 160 MHz band");
646 return -1;
647 }
648 break;
649 }
650
651 return 0;
652 }
653
654
set_disable_ht40(struct ieee80211_ht_capabilities * htcaps,int disabled)655 void set_disable_ht40(struct ieee80211_ht_capabilities *htcaps,
656 int disabled)
657 {
658 /* Masking these out disables HT40 */
659 le16 msk = host_to_le16(HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET |
660 HT_CAP_INFO_SHORT_GI40MHZ);
661
662 if (disabled)
663 htcaps->ht_capabilities_info &= ~msk;
664 else
665 htcaps->ht_capabilities_info |= msk;
666 }
667
668
669 #ifdef CONFIG_IEEE80211AC
670
_ieee80211ac_cap_check(u32 hw,u32 conf,u32 cap,const char * name)671 static int _ieee80211ac_cap_check(u32 hw, u32 conf, u32 cap,
672 const char *name)
673 {
674 u32 req_cap = conf & cap;
675
676 /*
677 * Make sure we support all requested capabilities.
678 * NOTE: We assume that 'cap' represents a capability mask,
679 * not a discrete value.
680 */
681 if ((hw & req_cap) != req_cap) {
682 wpa_printf(MSG_ERROR,
683 "Driver does not support configured VHT capability [%s]",
684 name);
685 return 0;
686 }
687 return 1;
688 }
689
690
ieee80211ac_cap_check_max(u32 hw,u32 conf,u32 mask,unsigned int shift,const char * name)691 static int ieee80211ac_cap_check_max(u32 hw, u32 conf, u32 mask,
692 unsigned int shift,
693 const char *name)
694 {
695 u32 hw_max = hw & mask;
696 u32 conf_val = conf & mask;
697
698 if (conf_val > hw_max) {
699 wpa_printf(MSG_ERROR,
700 "Configured VHT capability [%s] exceeds max value supported by the driver (%d > %d)",
701 name, conf_val >> shift, hw_max >> shift);
702 return 0;
703 }
704 return 1;
705 }
706
707
ieee80211ac_cap_check(u32 hw,u32 conf)708 int ieee80211ac_cap_check(u32 hw, u32 conf)
709 {
710 #define VHT_CAP_CHECK(cap) \
711 do { \
712 if (!_ieee80211ac_cap_check(hw, conf, cap, #cap)) \
713 return 0; \
714 } while (0)
715
716 #define VHT_CAP_CHECK_MAX(cap) \
717 do { \
718 if (!ieee80211ac_cap_check_max(hw, conf, cap, cap ## _SHIFT, \
719 #cap)) \
720 return 0; \
721 } while (0)
722
723 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_MPDU_LENGTH_MASK);
724 VHT_CAP_CHECK_MAX(VHT_CAP_SUPP_CHAN_WIDTH_MASK);
725 VHT_CAP_CHECK(VHT_CAP_RXLDPC);
726 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_80);
727 VHT_CAP_CHECK(VHT_CAP_SHORT_GI_160);
728 VHT_CAP_CHECK(VHT_CAP_TXSTBC);
729 VHT_CAP_CHECK_MAX(VHT_CAP_RXSTBC_MASK);
730 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMER_CAPABLE);
731 VHT_CAP_CHECK(VHT_CAP_SU_BEAMFORMEE_CAPABLE);
732 VHT_CAP_CHECK_MAX(VHT_CAP_BEAMFORMEE_STS_MAX);
733 VHT_CAP_CHECK_MAX(VHT_CAP_SOUNDING_DIMENSION_MAX);
734 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMER_CAPABLE);
735 VHT_CAP_CHECK(VHT_CAP_MU_BEAMFORMEE_CAPABLE);
736 VHT_CAP_CHECK(VHT_CAP_VHT_TXOP_PS);
737 VHT_CAP_CHECK(VHT_CAP_HTC_VHT);
738 VHT_CAP_CHECK_MAX(VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MAX);
739 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB);
740 VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB);
741 VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN);
742 VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN);
743
744 #undef VHT_CAP_CHECK
745 #undef VHT_CAP_CHECK_MAX
746
747 return 1;
748 }
749
750 #endif /* CONFIG_IEEE80211AC */
751
752
num_chan_to_bw(int num_chans)753 u32 num_chan_to_bw(int num_chans)
754 {
755 switch (num_chans) {
756 case 2:
757 case 4:
758 case 8:
759 return num_chans * 20;
760 default:
761 return 20;
762 }
763 }
764
765
766 /* check if BW is applicable for channel */
chan_bw_allowed(const struct hostapd_channel_data * chan,u32 bw,int ht40_plus,int pri)767 int chan_bw_allowed(const struct hostapd_channel_data *chan, u32 bw,
768 int ht40_plus, int pri)
769 {
770 u32 bw_mask;
771
772 switch (bw) {
773 case 20:
774 bw_mask = HOSTAPD_CHAN_WIDTH_20;
775 break;
776 case 40:
777 /* HT 40 MHz support declared only for primary channel,
778 * just skip 40 MHz secondary checking */
779 if (pri && ht40_plus)
780 bw_mask = HOSTAPD_CHAN_WIDTH_40P;
781 else if (pri && !ht40_plus)
782 bw_mask = HOSTAPD_CHAN_WIDTH_40M;
783 else
784 bw_mask = 0;
785 break;
786 case 80:
787 bw_mask = HOSTAPD_CHAN_WIDTH_80;
788 break;
789 case 160:
790 bw_mask = HOSTAPD_CHAN_WIDTH_160;
791 break;
792 default:
793 bw_mask = 0;
794 break;
795 }
796
797 return (chan->allowed_bw & bw_mask) == bw_mask;
798 }
799
800
801 /* check if channel is allowed to be used as primary */
chan_pri_allowed(const struct hostapd_channel_data * chan)802 int chan_pri_allowed(const struct hostapd_channel_data *chan)
803 {
804 return !(chan->flag & HOSTAPD_CHAN_DISABLED) &&
805 (chan->allowed_bw & HOSTAPD_CHAN_WIDTH_20);
806 }
807