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HE: Enable DFS similarly to VHT
[thirdparty/hostap.git] / src / ap / dfs.c
1 /*
2 * DFS - Dynamic Frequency Selection
3 * Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi>
4 * Copyright (c) 2013-2017, 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 "utils/includes.h"
11
12 #include "utils/common.h"
13 #include "common/ieee802_11_defs.h"
14 #include "common/hw_features_common.h"
15 #include "common/wpa_ctrl.h"
16 #include "hostapd.h"
17 #include "ap_drv_ops.h"
18 #include "drivers/driver.h"
19 #include "dfs.h"
20
21
22 static int dfs_get_used_n_chans(struct hostapd_iface *iface, int *seg1)
23 {
24 int n_chans = 1;
25
26 *seg1 = 0;
27
28 if (iface->conf->ieee80211n && iface->conf->secondary_channel)
29 n_chans = 2;
30
31 if (iface->conf->ieee80211ac || iface->conf->ieee80211ax) {
32 switch (hostapd_get_oper_chwidth(iface->conf)) {
33 case CHANWIDTH_USE_HT:
34 break;
35 case CHANWIDTH_80MHZ:
36 n_chans = 4;
37 break;
38 case CHANWIDTH_160MHZ:
39 n_chans = 8;
40 break;
41 case CHANWIDTH_80P80MHZ:
42 n_chans = 4;
43 *seg1 = 4;
44 break;
45 default:
46 break;
47 }
48 }
49
50 return n_chans;
51 }
52
53
54 static int dfs_channel_available(struct hostapd_channel_data *chan,
55 int skip_radar)
56 {
57 /*
58 * When radar detection happens, CSA is performed. However, there's no
59 * time for CAC, so radar channels must be skipped when finding a new
60 * channel for CSA, unless they are available for immediate use.
61 */
62 if (skip_radar && (chan->flag & HOSTAPD_CHAN_RADAR) &&
63 ((chan->flag & HOSTAPD_CHAN_DFS_MASK) !=
64 HOSTAPD_CHAN_DFS_AVAILABLE))
65 return 0;
66
67 if (chan->flag & HOSTAPD_CHAN_DISABLED)
68 return 0;
69 if ((chan->flag & HOSTAPD_CHAN_RADAR) &&
70 ((chan->flag & HOSTAPD_CHAN_DFS_MASK) ==
71 HOSTAPD_CHAN_DFS_UNAVAILABLE))
72 return 0;
73 return 1;
74 }
75
76
77 static int dfs_is_chan_allowed(struct hostapd_channel_data *chan, int n_chans)
78 {
79 /*
80 * The tables contain first valid channel number based on channel width.
81 * We will also choose this first channel as the control one.
82 */
83 int allowed_40[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157,
84 184, 192 };
85 /*
86 * VHT80, valid channels based on center frequency:
87 * 42, 58, 106, 122, 138, 155
88 */
89 int allowed_80[] = { 36, 52, 100, 116, 132, 149 };
90 /*
91 * VHT160 valid channels based on center frequency:
92 * 50, 114
93 */
94 int allowed_160[] = { 36, 100 };
95 int *allowed = allowed_40;
96 unsigned int i, allowed_no = 0;
97
98 switch (n_chans) {
99 case 2:
100 allowed = allowed_40;
101 allowed_no = ARRAY_SIZE(allowed_40);
102 break;
103 case 4:
104 allowed = allowed_80;
105 allowed_no = ARRAY_SIZE(allowed_80);
106 break;
107 case 8:
108 allowed = allowed_160;
109 allowed_no = ARRAY_SIZE(allowed_160);
110 break;
111 default:
112 wpa_printf(MSG_DEBUG, "Unknown width for %d channels", n_chans);
113 break;
114 }
115
116 for (i = 0; i < allowed_no; i++) {
117 if (chan->chan == allowed[i])
118 return 1;
119 }
120
121 return 0;
122 }
123
124
125 static struct hostapd_channel_data *
126 dfs_get_chan_data(struct hostapd_hw_modes *mode, int freq, int first_chan_idx)
127 {
128 int i;
129
130 for (i = first_chan_idx; i < mode->num_channels; i++) {
131 if (mode->channels[i].freq == freq)
132 return &mode->channels[i];
133 }
134
135 return NULL;
136 }
137
138
139 static int dfs_chan_range_available(struct hostapd_hw_modes *mode,
140 int first_chan_idx, int num_chans,
141 int skip_radar)
142 {
143 struct hostapd_channel_data *first_chan, *chan;
144 int i;
145 u32 bw = num_chan_to_bw(num_chans);
146
147 if (first_chan_idx + num_chans > mode->num_channels)
148 return 0;
149
150 first_chan = &mode->channels[first_chan_idx];
151
152 /* hostapd DFS implementation assumes the first channel as primary.
153 * If it's not allowed to use the first channel as primary, decline the
154 * whole channel range. */
155 if (!chan_pri_allowed(first_chan))
156 return 0;
157
158 for (i = 0; i < num_chans; i++) {
159 chan = dfs_get_chan_data(mode, first_chan->freq + i * 20,
160 first_chan_idx);
161 if (!chan)
162 return 0;
163
164 /* HT 40 MHz secondary channel availability checked only for
165 * primary channel */
166 if (!chan_bw_allowed(chan, bw, 1, !i))
167 return 0;
168
169 if (!dfs_channel_available(chan, skip_radar))
170 return 0;
171 }
172
173 return 1;
174 }
175
176
177 static int is_in_chanlist(struct hostapd_iface *iface,
178 struct hostapd_channel_data *chan)
179 {
180 if (!iface->conf->acs_ch_list.num)
181 return 1;
182
183 return freq_range_list_includes(&iface->conf->acs_ch_list, chan->chan);
184 }
185
186
187 /*
188 * The function assumes HT40+ operation.
189 * Make sure to adjust the following variables after calling this:
190 * - hapd->secondary_channel
191 * - hapd->vht/he_oper_centr_freq_seg0_idx
192 * - hapd->vht/he_oper_centr_freq_seg1_idx
193 */
194 static int dfs_find_channel(struct hostapd_iface *iface,
195 struct hostapd_channel_data **ret_chan,
196 int idx, int skip_radar)
197 {
198 struct hostapd_hw_modes *mode;
199 struct hostapd_channel_data *chan;
200 int i, channel_idx = 0, n_chans, n_chans1;
201
202 mode = iface->current_mode;
203 n_chans = dfs_get_used_n_chans(iface, &n_chans1);
204
205 wpa_printf(MSG_DEBUG, "DFS new chan checking %d channels", n_chans);
206 for (i = 0; i < mode->num_channels; i++) {
207 chan = &mode->channels[i];
208
209 /* Skip HT40/VHT incompatible channels */
210 if (iface->conf->ieee80211n &&
211 iface->conf->secondary_channel &&
212 (!dfs_is_chan_allowed(chan, n_chans) ||
213 !(chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P)))
214 continue;
215
216 /* Skip incompatible chandefs */
217 if (!dfs_chan_range_available(mode, i, n_chans, skip_radar))
218 continue;
219
220 if (!is_in_chanlist(iface, chan))
221 continue;
222
223 if (ret_chan && idx == channel_idx) {
224 wpa_printf(MSG_DEBUG, "Selected ch. #%d", chan->chan);
225 *ret_chan = chan;
226 return idx;
227 }
228 wpa_printf(MSG_DEBUG, "Adding channel: %d", chan->chan);
229 channel_idx++;
230 }
231 return channel_idx;
232 }
233
234
235 static void dfs_adjust_center_freq(struct hostapd_iface *iface,
236 struct hostapd_channel_data *chan,
237 int secondary_channel,
238 u8 *oper_centr_freq_seg0_idx,
239 u8 *oper_centr_freq_seg1_idx)
240 {
241 if (!iface->conf->ieee80211ac && !iface->conf->ieee80211ax)
242 return;
243
244 if (!chan)
245 return;
246
247 *oper_centr_freq_seg1_idx = 0;
248
249 switch (hostapd_get_oper_chwidth(iface->conf)) {
250 case CHANWIDTH_USE_HT:
251 if (secondary_channel == 1)
252 *oper_centr_freq_seg0_idx = chan->chan + 2;
253 else if (secondary_channel == -1)
254 *oper_centr_freq_seg0_idx = chan->chan - 2;
255 else
256 *oper_centr_freq_seg0_idx = chan->chan;
257 break;
258 case CHANWIDTH_80MHZ:
259 *oper_centr_freq_seg0_idx = chan->chan + 6;
260 break;
261 case CHANWIDTH_160MHZ:
262 *oper_centr_freq_seg0_idx = chan->chan + 14;
263 break;
264 default:
265 wpa_printf(MSG_INFO, "DFS only VHT20/40/80/160 is supported now");
266 *oper_centr_freq_seg0_idx = 0;
267 break;
268 }
269
270 wpa_printf(MSG_DEBUG, "DFS adjusting VHT center frequency: %d, %d",
271 *oper_centr_freq_seg0_idx,
272 *oper_centr_freq_seg1_idx);
273 }
274
275
276 /* Return start channel idx we will use for mode->channels[idx] */
277 static int dfs_get_start_chan_idx(struct hostapd_iface *iface, int *seg1_start)
278 {
279 struct hostapd_hw_modes *mode;
280 struct hostapd_channel_data *chan;
281 int channel_no = iface->conf->channel;
282 int res = -1, i;
283 int chan_seg1 = -1;
284
285 *seg1_start = -1;
286
287 /* HT40- */
288 if (iface->conf->ieee80211n && iface->conf->secondary_channel == -1)
289 channel_no -= 4;
290
291 /* VHT/HE */
292 if (iface->conf->ieee80211ac || iface->conf->ieee80211ax) {
293 switch (hostapd_get_oper_chwidth(iface->conf)) {
294 case CHANWIDTH_USE_HT:
295 break;
296 case CHANWIDTH_80MHZ:
297 channel_no = hostapd_get_oper_centr_freq_seg0_idx(
298 iface->conf) - 6;
299 break;
300 case CHANWIDTH_160MHZ:
301 channel_no = hostapd_get_oper_centr_freq_seg0_idx(
302 iface->conf) - 14;
303 break;
304 case CHANWIDTH_80P80MHZ:
305 channel_no = hostapd_get_oper_centr_freq_seg0_idx(
306 iface->conf) - 6;
307 chan_seg1 = hostapd_get_oper_centr_freq_seg1_idx(
308 iface->conf) - 6;
309 break;
310 default:
311 wpa_printf(MSG_INFO,
312 "DFS only VHT20/40/80/160/80+80 is supported now");
313 channel_no = -1;
314 break;
315 }
316 }
317
318 /* Get idx */
319 mode = iface->current_mode;
320 for (i = 0; i < mode->num_channels; i++) {
321 chan = &mode->channels[i];
322 if (chan->chan == channel_no) {
323 res = i;
324 break;
325 }
326 }
327
328 if (res != -1 && chan_seg1 > -1) {
329 int found = 0;
330
331 /* Get idx for seg1 */
332 mode = iface->current_mode;
333 for (i = 0; i < mode->num_channels; i++) {
334 chan = &mode->channels[i];
335 if (chan->chan == chan_seg1) {
336 *seg1_start = i;
337 found = 1;
338 break;
339 }
340 }
341 if (!found)
342 res = -1;
343 }
344
345 if (res == -1) {
346 wpa_printf(MSG_DEBUG,
347 "DFS chan_idx seems wrong; num-ch: %d ch-no: %d conf-ch-no: %d 11n: %d sec-ch: %d vht-oper-width: %d",
348 mode->num_channels, channel_no, iface->conf->channel,
349 iface->conf->ieee80211n,
350 iface->conf->secondary_channel,
351 hostapd_get_oper_chwidth(iface->conf));
352
353 for (i = 0; i < mode->num_channels; i++) {
354 wpa_printf(MSG_DEBUG, "Available channel: %d",
355 mode->channels[i].chan);
356 }
357 }
358
359 return res;
360 }
361
362
363 /* At least one channel have radar flag */
364 static int dfs_check_chans_radar(struct hostapd_iface *iface,
365 int start_chan_idx, int n_chans)
366 {
367 struct hostapd_channel_data *channel;
368 struct hostapd_hw_modes *mode;
369 int i, res = 0;
370
371 mode = iface->current_mode;
372
373 for (i = 0; i < n_chans; i++) {
374 channel = &mode->channels[start_chan_idx + i];
375 if (channel->flag & HOSTAPD_CHAN_RADAR)
376 res++;
377 }
378
379 return res;
380 }
381
382
383 /* All channels available */
384 static int dfs_check_chans_available(struct hostapd_iface *iface,
385 int start_chan_idx, int n_chans)
386 {
387 struct hostapd_channel_data *channel;
388 struct hostapd_hw_modes *mode;
389 int i;
390
391 mode = iface->current_mode;
392
393 for (i = 0; i < n_chans; i++) {
394 channel = &mode->channels[start_chan_idx + i];
395
396 if (channel->flag & HOSTAPD_CHAN_DISABLED)
397 break;
398
399 if (!(channel->flag & HOSTAPD_CHAN_RADAR))
400 continue;
401
402 if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) !=
403 HOSTAPD_CHAN_DFS_AVAILABLE)
404 break;
405 }
406
407 return i == n_chans;
408 }
409
410
411 /* At least one channel unavailable */
412 static int dfs_check_chans_unavailable(struct hostapd_iface *iface,
413 int start_chan_idx,
414 int n_chans)
415 {
416 struct hostapd_channel_data *channel;
417 struct hostapd_hw_modes *mode;
418 int i, res = 0;
419
420 mode = iface->current_mode;
421
422 for (i = 0; i < n_chans; i++) {
423 channel = &mode->channels[start_chan_idx + i];
424 if (channel->flag & HOSTAPD_CHAN_DISABLED)
425 res++;
426 if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) ==
427 HOSTAPD_CHAN_DFS_UNAVAILABLE)
428 res++;
429 }
430
431 return res;
432 }
433
434
435 static struct hostapd_channel_data *
436 dfs_get_valid_channel(struct hostapd_iface *iface,
437 int *secondary_channel,
438 u8 *oper_centr_freq_seg0_idx,
439 u8 *oper_centr_freq_seg1_idx,
440 int skip_radar)
441 {
442 struct hostapd_hw_modes *mode;
443 struct hostapd_channel_data *chan = NULL;
444 int num_available_chandefs;
445 int chan_idx;
446 u32 _rand;
447
448 wpa_printf(MSG_DEBUG, "DFS: Selecting random channel");
449 *secondary_channel = 0;
450 *oper_centr_freq_seg0_idx = 0;
451 *oper_centr_freq_seg1_idx = 0;
452
453 if (iface->current_mode == NULL)
454 return NULL;
455
456 mode = iface->current_mode;
457 if (mode->mode != HOSTAPD_MODE_IEEE80211A)
458 return NULL;
459
460 /* Get the count first */
461 num_available_chandefs = dfs_find_channel(iface, NULL, 0, skip_radar);
462 if (num_available_chandefs == 0)
463 return NULL;
464
465 if (os_get_random((u8 *) &_rand, sizeof(_rand)) < 0)
466 return NULL;
467 chan_idx = _rand % num_available_chandefs;
468 dfs_find_channel(iface, &chan, chan_idx, skip_radar);
469
470 /* dfs_find_channel() calculations assume HT40+ */
471 if (iface->conf->secondary_channel)
472 *secondary_channel = 1;
473 else
474 *secondary_channel = 0;
475
476 dfs_adjust_center_freq(iface, chan,
477 *secondary_channel,
478 oper_centr_freq_seg0_idx,
479 oper_centr_freq_seg1_idx);
480
481 return chan;
482 }
483
484
485 static int set_dfs_state_freq(struct hostapd_iface *iface, int freq, u32 state)
486 {
487 struct hostapd_hw_modes *mode;
488 struct hostapd_channel_data *chan = NULL;
489 int i;
490
491 mode = iface->current_mode;
492 if (mode == NULL)
493 return 0;
494
495 wpa_printf(MSG_DEBUG, "set_dfs_state 0x%X for %d MHz", state, freq);
496 for (i = 0; i < iface->current_mode->num_channels; i++) {
497 chan = &iface->current_mode->channels[i];
498 if (chan->freq == freq) {
499 if (chan->flag & HOSTAPD_CHAN_RADAR) {
500 chan->flag &= ~HOSTAPD_CHAN_DFS_MASK;
501 chan->flag |= state;
502 return 1; /* Channel found */
503 }
504 }
505 }
506 wpa_printf(MSG_WARNING, "Can't set DFS state for freq %d MHz", freq);
507 return 0;
508 }
509
510
511 static int set_dfs_state(struct hostapd_iface *iface, int freq, int ht_enabled,
512 int chan_offset, int chan_width, int cf1,
513 int cf2, u32 state)
514 {
515 int n_chans = 1, i;
516 struct hostapd_hw_modes *mode;
517 int frequency = freq;
518 int ret = 0;
519
520 mode = iface->current_mode;
521 if (mode == NULL)
522 return 0;
523
524 if (mode->mode != HOSTAPD_MODE_IEEE80211A) {
525 wpa_printf(MSG_WARNING, "current_mode != IEEE80211A");
526 return 0;
527 }
528
529 /* Seems cf1 and chan_width is enough here */
530 switch (chan_width) {
531 case CHAN_WIDTH_20_NOHT:
532 case CHAN_WIDTH_20:
533 n_chans = 1;
534 if (frequency == 0)
535 frequency = cf1;
536 break;
537 case CHAN_WIDTH_40:
538 n_chans = 2;
539 frequency = cf1 - 10;
540 break;
541 case CHAN_WIDTH_80:
542 n_chans = 4;
543 frequency = cf1 - 30;
544 break;
545 case CHAN_WIDTH_160:
546 n_chans = 8;
547 frequency = cf1 - 70;
548 break;
549 default:
550 wpa_printf(MSG_INFO, "DFS chan_width %d not supported",
551 chan_width);
552 break;
553 }
554
555 wpa_printf(MSG_DEBUG, "DFS freq: %dMHz, n_chans: %d", frequency,
556 n_chans);
557 for (i = 0; i < n_chans; i++) {
558 ret += set_dfs_state_freq(iface, frequency, state);
559 frequency = frequency + 20;
560 }
561
562 return ret;
563 }
564
565
566 static int dfs_are_channels_overlapped(struct hostapd_iface *iface, int freq,
567 int chan_width, int cf1, int cf2)
568 {
569 int start_chan_idx, start_chan_idx1;
570 struct hostapd_hw_modes *mode;
571 struct hostapd_channel_data *chan;
572 int n_chans, n_chans1, i, j, frequency = freq, radar_n_chans = 1;
573 u8 radar_chan;
574 int res = 0;
575
576 /* Our configuration */
577 mode = iface->current_mode;
578 start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1);
579 n_chans = dfs_get_used_n_chans(iface, &n_chans1);
580
581 /* Check we are on DFS channel(s) */
582 if (!dfs_check_chans_radar(iface, start_chan_idx, n_chans))
583 return 0;
584
585 /* Reported via radar event */
586 switch (chan_width) {
587 case CHAN_WIDTH_20_NOHT:
588 case CHAN_WIDTH_20:
589 radar_n_chans = 1;
590 if (frequency == 0)
591 frequency = cf1;
592 break;
593 case CHAN_WIDTH_40:
594 radar_n_chans = 2;
595 frequency = cf1 - 10;
596 break;
597 case CHAN_WIDTH_80:
598 radar_n_chans = 4;
599 frequency = cf1 - 30;
600 break;
601 case CHAN_WIDTH_160:
602 radar_n_chans = 8;
603 frequency = cf1 - 70;
604 break;
605 default:
606 wpa_printf(MSG_INFO, "DFS chan_width %d not supported",
607 chan_width);
608 break;
609 }
610
611 ieee80211_freq_to_chan(frequency, &radar_chan);
612
613 for (i = 0; i < n_chans; i++) {
614 chan = &mode->channels[start_chan_idx + i];
615 if (!(chan->flag & HOSTAPD_CHAN_RADAR))
616 continue;
617 for (j = 0; j < radar_n_chans; j++) {
618 wpa_printf(MSG_DEBUG, "checking our: %d, radar: %d",
619 chan->chan, radar_chan + j * 4);
620 if (chan->chan == radar_chan + j * 4)
621 res++;
622 }
623 }
624
625 wpa_printf(MSG_DEBUG, "overlapped: %d", res);
626
627 return res;
628 }
629
630
631 static unsigned int dfs_get_cac_time(struct hostapd_iface *iface,
632 int start_chan_idx, int n_chans)
633 {
634 struct hostapd_channel_data *channel;
635 struct hostapd_hw_modes *mode;
636 int i;
637 unsigned int cac_time_ms = 0;
638
639 mode = iface->current_mode;
640
641 for (i = 0; i < n_chans; i++) {
642 channel = &mode->channels[start_chan_idx + i];
643 if (!(channel->flag & HOSTAPD_CHAN_RADAR))
644 continue;
645 if (channel->dfs_cac_ms > cac_time_ms)
646 cac_time_ms = channel->dfs_cac_ms;
647 }
648
649 return cac_time_ms;
650 }
651
652
653 /*
654 * Main DFS handler
655 * 1 - continue channel/ap setup
656 * 0 - channel/ap setup will be continued after CAC
657 * -1 - hit critical error
658 */
659 int hostapd_handle_dfs(struct hostapd_iface *iface)
660 {
661 struct hostapd_channel_data *channel;
662 int res, n_chans, n_chans1, start_chan_idx, start_chan_idx1;
663 int skip_radar = 0;
664
665 if (!iface->current_mode) {
666 /*
667 * This can happen with drivers that do not provide mode
668 * information and as such, cannot really use hostapd for DFS.
669 */
670 wpa_printf(MSG_DEBUG,
671 "DFS: No current_mode information - assume no need to perform DFS operations by hostapd");
672 return 1;
673 }
674
675 iface->cac_started = 0;
676
677 do {
678 /* Get start (first) channel for current configuration */
679 start_chan_idx = dfs_get_start_chan_idx(iface,
680 &start_chan_idx1);
681 if (start_chan_idx == -1)
682 return -1;
683
684 /* Get number of used channels, depend on width */
685 n_chans = dfs_get_used_n_chans(iface, &n_chans1);
686
687 /* Setup CAC time */
688 iface->dfs_cac_ms = dfs_get_cac_time(iface, start_chan_idx,
689 n_chans);
690
691 /* Check if any of configured channels require DFS */
692 res = dfs_check_chans_radar(iface, start_chan_idx, n_chans);
693 wpa_printf(MSG_DEBUG,
694 "DFS %d channels required radar detection",
695 res);
696 if (!res)
697 return 1;
698
699 /* Check if all channels are DFS available */
700 res = dfs_check_chans_available(iface, start_chan_idx, n_chans);
701 wpa_printf(MSG_DEBUG,
702 "DFS all channels available, (SKIP CAC): %s",
703 res ? "yes" : "no");
704 if (res)
705 return 1;
706
707 /* Check if any of configured channels is unavailable */
708 res = dfs_check_chans_unavailable(iface, start_chan_idx,
709 n_chans);
710 wpa_printf(MSG_DEBUG, "DFS %d chans unavailable - choose other channel: %s",
711 res, res ? "yes": "no");
712 if (res) {
713 int sec = 0;
714 u8 cf1 = 0, cf2 = 0;
715
716 channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2,
717 skip_radar);
718 if (!channel) {
719 wpa_printf(MSG_ERROR, "could not get valid channel");
720 hostapd_set_state(iface, HAPD_IFACE_DFS);
721 return 0;
722 }
723
724 iface->freq = channel->freq;
725 iface->conf->channel = channel->chan;
726 iface->conf->secondary_channel = sec;
727 hostapd_set_oper_centr_freq_seg0_idx(iface->conf, cf1);
728 hostapd_set_oper_centr_freq_seg1_idx(iface->conf, cf2);
729 }
730 } while (res);
731
732 /* Finally start CAC */
733 hostapd_set_state(iface, HAPD_IFACE_DFS);
734 wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz", iface->freq);
735 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START
736 "freq=%d chan=%d sec_chan=%d, width=%d, seg0=%d, seg1=%d, cac_time=%ds",
737 iface->freq,
738 iface->conf->channel, iface->conf->secondary_channel,
739 hostapd_get_oper_chwidth(iface->conf),
740 hostapd_get_oper_centr_freq_seg0_idx(iface->conf),
741 hostapd_get_oper_centr_freq_seg1_idx(iface->conf),
742 iface->dfs_cac_ms / 1000);
743
744 res = hostapd_start_dfs_cac(
745 iface, iface->conf->hw_mode, iface->freq, iface->conf->channel,
746 iface->conf->ieee80211n, iface->conf->ieee80211ac,
747 iface->conf->ieee80211ax,
748 iface->conf->secondary_channel,
749 hostapd_get_oper_chwidth(iface->conf),
750 hostapd_get_oper_centr_freq_seg0_idx(iface->conf),
751 hostapd_get_oper_centr_freq_seg1_idx(iface->conf));
752
753 if (res) {
754 wpa_printf(MSG_ERROR, "DFS start_dfs_cac() failed, %d", res);
755 return -1;
756 }
757
758 return 0;
759 }
760
761
762 static int hostapd_config_dfs_chan_available(struct hostapd_iface *iface)
763 {
764 int n_chans, n_chans1, start_chan_idx, start_chan_idx1;
765
766 /* Get the start (first) channel for current configuration */
767 start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1);
768 if (start_chan_idx < 0)
769 return 0;
770
771 /* Get the number of used channels, depending on width */
772 n_chans = dfs_get_used_n_chans(iface, &n_chans1);
773
774 /* Check if all channels are DFS available */
775 return dfs_check_chans_available(iface, start_chan_idx, n_chans);
776 }
777
778
779 int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq,
780 int ht_enabled, int chan_offset, int chan_width,
781 int cf1, int cf2)
782 {
783 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_COMPLETED
784 "success=%d freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d",
785 success, freq, ht_enabled, chan_offset, chan_width, cf1, cf2);
786
787 if (success) {
788 /* Complete iface/ap configuration */
789 if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) {
790 /* Complete AP configuration for the first bring up. */
791 if (iface->state != HAPD_IFACE_ENABLED)
792 hostapd_setup_interface_complete(iface, 0);
793 else
794 iface->cac_started = 0;
795 } else {
796 set_dfs_state(iface, freq, ht_enabled, chan_offset,
797 chan_width, cf1, cf2,
798 HOSTAPD_CHAN_DFS_AVAILABLE);
799 /*
800 * Just mark the channel available when CAC completion
801 * event is received in enabled state. CAC result could
802 * have been propagated from another radio having the
803 * same regulatory configuration. When CAC completion is
804 * received during non-HAPD_IFACE_ENABLED state, make
805 * sure the configured channel is available because this
806 * CAC completion event could have been propagated from
807 * another radio.
808 */
809 if (iface->state != HAPD_IFACE_ENABLED &&
810 hostapd_config_dfs_chan_available(iface)) {
811 hostapd_setup_interface_complete(iface, 0);
812 iface->cac_started = 0;
813 }
814 }
815 }
816
817 return 0;
818 }
819
820
821 int hostapd_dfs_pre_cac_expired(struct hostapd_iface *iface, int freq,
822 int ht_enabled, int chan_offset, int chan_width,
823 int cf1, int cf2)
824 {
825 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_PRE_CAC_EXPIRED
826 "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d",
827 freq, ht_enabled, chan_offset, chan_width, cf1, cf2);
828
829 /* Proceed only if DFS is not offloaded to the driver */
830 if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
831 return 0;
832
833 set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width,
834 cf1, cf2, HOSTAPD_CHAN_DFS_USABLE);
835
836 return 0;
837 }
838
839
840 static int hostapd_dfs_start_channel_switch_cac(struct hostapd_iface *iface)
841 {
842 struct hostapd_channel_data *channel;
843 int secondary_channel;
844 u8 oper_centr_freq_seg0_idx = 0;
845 u8 oper_centr_freq_seg1_idx = 0;
846 int skip_radar = 0;
847 int err = 1;
848
849 /* Radar detected during active CAC */
850 iface->cac_started = 0;
851 channel = dfs_get_valid_channel(iface, &secondary_channel,
852 &oper_centr_freq_seg0_idx,
853 &oper_centr_freq_seg1_idx,
854 skip_radar);
855
856 if (!channel) {
857 wpa_printf(MSG_ERROR, "No valid channel available");
858 return err;
859 }
860
861 wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d",
862 channel->chan);
863 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL
864 "freq=%d chan=%d sec_chan=%d", channel->freq,
865 channel->chan, secondary_channel);
866
867 iface->freq = channel->freq;
868 iface->conf->channel = channel->chan;
869 iface->conf->secondary_channel = secondary_channel;
870 hostapd_set_oper_centr_freq_seg0_idx(iface->conf,
871 oper_centr_freq_seg0_idx);
872 hostapd_set_oper_centr_freq_seg1_idx(iface->conf,
873 oper_centr_freq_seg1_idx);
874 err = 0;
875
876 hostapd_setup_interface_complete(iface, err);
877 return err;
878 }
879
880
881 static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface)
882 {
883 struct hostapd_channel_data *channel;
884 int secondary_channel;
885 u8 oper_centr_freq_seg0_idx;
886 u8 oper_centr_freq_seg1_idx;
887 int skip_radar = 1;
888 struct csa_settings csa_settings;
889 unsigned int i;
890 int err = 1;
891
892 wpa_printf(MSG_DEBUG, "%s called (CAC active: %s, CSA active: %s)",
893 __func__, iface->cac_started ? "yes" : "no",
894 hostapd_csa_in_progress(iface) ? "yes" : "no");
895
896 /* Check if CSA in progress */
897 if (hostapd_csa_in_progress(iface))
898 return 0;
899
900 /* Check if active CAC */
901 if (iface->cac_started)
902 return hostapd_dfs_start_channel_switch_cac(iface);
903
904 /*
905 * Allow selection of DFS channel in ETSI to comply with
906 * uniform spreading.
907 */
908 if (iface->dfs_domain == HOSTAPD_DFS_REGION_ETSI)
909 skip_radar = 0;
910
911 /* Perform channel switch/CSA */
912 channel = dfs_get_valid_channel(iface, &secondary_channel,
913 &oper_centr_freq_seg0_idx,
914 &oper_centr_freq_seg1_idx,
915 skip_radar);
916
917 if (!channel) {
918 /*
919 * If there is no channel to switch immediately to, check if
920 * there is another channel where we can switch even if it
921 * requires to perform a CAC first.
922 */
923 skip_radar = 0;
924 channel = dfs_get_valid_channel(iface, &secondary_channel,
925 &oper_centr_freq_seg0_idx,
926 &oper_centr_freq_seg1_idx,
927 skip_radar);
928 if (!channel) {
929 wpa_printf(MSG_INFO,
930 "%s: no DFS channels left, waiting for NOP to finish",
931 __func__);
932 return err;
933 }
934
935 iface->freq = channel->freq;
936 iface->conf->channel = channel->chan;
937 iface->conf->secondary_channel = secondary_channel;
938 hostapd_set_oper_centr_freq_seg0_idx(iface->conf,
939 oper_centr_freq_seg0_idx);
940 hostapd_set_oper_centr_freq_seg1_idx(iface->conf,
941 oper_centr_freq_seg1_idx);
942
943 hostapd_disable_iface(iface);
944 hostapd_enable_iface(iface);
945 return 0;
946 }
947
948 wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d",
949 channel->chan);
950 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL
951 "freq=%d chan=%d sec_chan=%d", channel->freq,
952 channel->chan, secondary_channel);
953
954 /* Setup CSA request */
955 os_memset(&csa_settings, 0, sizeof(csa_settings));
956 csa_settings.cs_count = 5;
957 csa_settings.block_tx = 1;
958 err = hostapd_set_freq_params(&csa_settings.freq_params,
959 iface->conf->hw_mode,
960 channel->freq,
961 channel->chan,
962 iface->conf->ieee80211n,
963 iface->conf->ieee80211ac,
964 iface->conf->ieee80211ax,
965 secondary_channel,
966 hostapd_get_oper_chwidth(iface->conf),
967 oper_centr_freq_seg0_idx,
968 oper_centr_freq_seg1_idx,
969 iface->current_mode->vht_capab,
970 &iface->current_mode->he_capab);
971
972 if (err) {
973 wpa_printf(MSG_ERROR, "DFS failed to calculate CSA freq params");
974 hostapd_disable_iface(iface);
975 return err;
976 }
977
978 for (i = 0; i < iface->num_bss; i++) {
979 err = hostapd_switch_channel(iface->bss[i], &csa_settings);
980 if (err)
981 break;
982 }
983
984 if (err) {
985 wpa_printf(MSG_WARNING, "DFS failed to schedule CSA (%d) - trying fallback",
986 err);
987 iface->freq = channel->freq;
988 iface->conf->channel = channel->chan;
989 iface->conf->secondary_channel = secondary_channel;
990 hostapd_set_oper_centr_freq_seg0_idx(iface->conf,
991 oper_centr_freq_seg0_idx);
992 hostapd_set_oper_centr_freq_seg1_idx(iface->conf,
993 oper_centr_freq_seg1_idx);
994
995 hostapd_disable_iface(iface);
996 hostapd_enable_iface(iface);
997 return 0;
998 }
999
1000 /* Channel configuration will be updated once CSA completes and
1001 * ch_switch_notify event is received */
1002
1003 wpa_printf(MSG_DEBUG, "DFS waiting channel switch event");
1004 return 0;
1005 }
1006
1007
1008 int hostapd_dfs_radar_detected(struct hostapd_iface *iface, int freq,
1009 int ht_enabled, int chan_offset, int chan_width,
1010 int cf1, int cf2)
1011 {
1012 int res;
1013
1014 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_RADAR_DETECTED
1015 "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d",
1016 freq, ht_enabled, chan_offset, chan_width, cf1, cf2);
1017
1018 /* Proceed only if DFS is not offloaded to the driver */
1019 if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
1020 return 0;
1021
1022 if (!iface->conf->ieee80211h)
1023 return 0;
1024
1025 /* mark radar frequency as invalid */
1026 set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width,
1027 cf1, cf2, HOSTAPD_CHAN_DFS_UNAVAILABLE);
1028
1029 /* Skip if reported radar event not overlapped our channels */
1030 res = dfs_are_channels_overlapped(iface, freq, chan_width, cf1, cf2);
1031 if (!res)
1032 return 0;
1033
1034 /* radar detected while operating, switch the channel. */
1035 res = hostapd_dfs_start_channel_switch(iface);
1036
1037 return res;
1038 }
1039
1040
1041 int hostapd_dfs_nop_finished(struct hostapd_iface *iface, int freq,
1042 int ht_enabled, int chan_offset, int chan_width,
1043 int cf1, int cf2)
1044 {
1045 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NOP_FINISHED
1046 "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d",
1047 freq, ht_enabled, chan_offset, chan_width, cf1, cf2);
1048
1049 /* Proceed only if DFS is not offloaded to the driver */
1050 if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD)
1051 return 0;
1052
1053 /* TODO add correct implementation here */
1054 set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width,
1055 cf1, cf2, HOSTAPD_CHAN_DFS_USABLE);
1056
1057 /* Handle cases where all channels were initially unavailable */
1058 if (iface->state == HAPD_IFACE_DFS && !iface->cac_started)
1059 hostapd_handle_dfs(iface);
1060
1061 return 0;
1062 }
1063
1064
1065 int hostapd_is_dfs_required(struct hostapd_iface *iface)
1066 {
1067 int n_chans, n_chans1, start_chan_idx, start_chan_idx1, res;
1068
1069 if (!iface->conf->ieee80211h || !iface->current_mode ||
1070 iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A)
1071 return 0;
1072
1073 /* Get start (first) channel for current configuration */
1074 start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1);
1075 if (start_chan_idx == -1)
1076 return -1;
1077
1078 /* Get number of used channels, depend on width */
1079 n_chans = dfs_get_used_n_chans(iface, &n_chans1);
1080
1081 /* Check if any of configured channels require DFS */
1082 res = dfs_check_chans_radar(iface, start_chan_idx, n_chans);
1083 if (res)
1084 return res;
1085 if (start_chan_idx1 >= 0 && n_chans1 > 0)
1086 res = dfs_check_chans_radar(iface, start_chan_idx1, n_chans1);
1087 return res;
1088 }
1089
1090
1091 int hostapd_dfs_start_cac(struct hostapd_iface *iface, int freq,
1092 int ht_enabled, int chan_offset, int chan_width,
1093 int cf1, int cf2)
1094 {
1095 wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START
1096 "freq=%d chan=%d chan_offset=%d width=%d seg0=%d "
1097 "seg1=%d cac_time=%ds",
1098 freq, (freq - 5000) / 5, chan_offset, chan_width, cf1, cf2, 60);
1099 iface->cac_started = 1;
1100 return 0;
1101 }
1102
1103
1104 /*
1105 * Main DFS handler for offloaded case.
1106 * 2 - continue channel/AP setup for non-DFS channel
1107 * 1 - continue channel/AP setup for DFS channel
1108 * 0 - channel/AP setup will be continued after CAC
1109 * -1 - hit critical error
1110 */
1111 int hostapd_handle_dfs_offload(struct hostapd_iface *iface)
1112 {
1113 wpa_printf(MSG_DEBUG, "%s: iface->cac_started: %d",
1114 __func__, iface->cac_started);
1115
1116 /*
1117 * If DFS has already been started, then we are being called from a
1118 * callback to continue AP/channel setup. Reset the CAC start flag and
1119 * return.
1120 */
1121 if (iface->cac_started) {
1122 wpa_printf(MSG_DEBUG, "%s: iface->cac_started: %d",
1123 __func__, iface->cac_started);
1124 iface->cac_started = 0;
1125 return 1;
1126 }
1127
1128 if (ieee80211_is_dfs(iface->freq, iface->hw_features,
1129 iface->num_hw_features)) {
1130 wpa_printf(MSG_DEBUG, "%s: freq %d MHz requires DFS",
1131 __func__, iface->freq);
1132 return 0;
1133 }
1134
1135 wpa_printf(MSG_DEBUG,
1136 "%s: freq %d MHz does not require DFS. Continue channel/AP setup",
1137 __func__, iface->freq);
1138 return 2;
1139 }
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