1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * This file contains helper code to handle channel |
4 | * settings and keeping track of what is possible at |
5 | * any point in time. |
6 | * |
7 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> |
8 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
9 | * Copyright 2018-2023 Intel Corporation |
10 | */ |
11 | |
12 | #include <linux/export.h> |
13 | #include <linux/bitfield.h> |
14 | #include <net/cfg80211.h> |
15 | #include "core.h" |
16 | #include "rdev-ops.h" |
17 | |
18 | static bool cfg80211_valid_60g_freq(u32 freq) |
19 | { |
20 | return freq >= 58320 && freq <= 70200; |
21 | } |
22 | |
23 | void cfg80211_chandef_create(struct cfg80211_chan_def *chandef, |
24 | struct ieee80211_channel *chan, |
25 | enum nl80211_channel_type chan_type) |
26 | { |
27 | if (WARN_ON(!chan)) |
28 | return; |
29 | |
30 | chandef->chan = chan; |
31 | chandef->freq1_offset = chan->freq_offset; |
32 | chandef->center_freq2 = 0; |
33 | chandef->edmg.bw_config = 0; |
34 | chandef->edmg.channels = 0; |
35 | |
36 | switch (chan_type) { |
37 | case NL80211_CHAN_NO_HT: |
38 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; |
39 | chandef->center_freq1 = chan->center_freq; |
40 | break; |
41 | case NL80211_CHAN_HT20: |
42 | chandef->width = NL80211_CHAN_WIDTH_20; |
43 | chandef->center_freq1 = chan->center_freq; |
44 | break; |
45 | case NL80211_CHAN_HT40PLUS: |
46 | chandef->width = NL80211_CHAN_WIDTH_40; |
47 | chandef->center_freq1 = chan->center_freq + 10; |
48 | break; |
49 | case NL80211_CHAN_HT40MINUS: |
50 | chandef->width = NL80211_CHAN_WIDTH_40; |
51 | chandef->center_freq1 = chan->center_freq - 10; |
52 | break; |
53 | default: |
54 | WARN_ON(1); |
55 | } |
56 | } |
57 | EXPORT_SYMBOL(cfg80211_chandef_create); |
58 | |
59 | static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef) |
60 | { |
61 | int max_contiguous = 0; |
62 | int num_of_enabled = 0; |
63 | int contiguous = 0; |
64 | int i; |
65 | |
66 | if (!chandef->edmg.channels || !chandef->edmg.bw_config) |
67 | return false; |
68 | |
69 | if (!cfg80211_valid_60g_freq(freq: chandef->chan->center_freq)) |
70 | return false; |
71 | |
72 | for (i = 0; i < 6; i++) { |
73 | if (chandef->edmg.channels & BIT(i)) { |
74 | contiguous++; |
75 | num_of_enabled++; |
76 | } else { |
77 | contiguous = 0; |
78 | } |
79 | |
80 | max_contiguous = max(contiguous, max_contiguous); |
81 | } |
82 | /* basic verification of edmg configuration according to |
83 | * IEEE P802.11ay/D4.0 section 9.4.2.251 |
84 | */ |
85 | /* check bw_config against contiguous edmg channels */ |
86 | switch (chandef->edmg.bw_config) { |
87 | case IEEE80211_EDMG_BW_CONFIG_4: |
88 | case IEEE80211_EDMG_BW_CONFIG_8: |
89 | case IEEE80211_EDMG_BW_CONFIG_12: |
90 | if (max_contiguous < 1) |
91 | return false; |
92 | break; |
93 | case IEEE80211_EDMG_BW_CONFIG_5: |
94 | case IEEE80211_EDMG_BW_CONFIG_9: |
95 | case IEEE80211_EDMG_BW_CONFIG_13: |
96 | if (max_contiguous < 2) |
97 | return false; |
98 | break; |
99 | case IEEE80211_EDMG_BW_CONFIG_6: |
100 | case IEEE80211_EDMG_BW_CONFIG_10: |
101 | case IEEE80211_EDMG_BW_CONFIG_14: |
102 | if (max_contiguous < 3) |
103 | return false; |
104 | break; |
105 | case IEEE80211_EDMG_BW_CONFIG_7: |
106 | case IEEE80211_EDMG_BW_CONFIG_11: |
107 | case IEEE80211_EDMG_BW_CONFIG_15: |
108 | if (max_contiguous < 4) |
109 | return false; |
110 | break; |
111 | |
112 | default: |
113 | return false; |
114 | } |
115 | |
116 | /* check bw_config against aggregated (non contiguous) edmg channels */ |
117 | switch (chandef->edmg.bw_config) { |
118 | case IEEE80211_EDMG_BW_CONFIG_4: |
119 | case IEEE80211_EDMG_BW_CONFIG_5: |
120 | case IEEE80211_EDMG_BW_CONFIG_6: |
121 | case IEEE80211_EDMG_BW_CONFIG_7: |
122 | break; |
123 | case IEEE80211_EDMG_BW_CONFIG_8: |
124 | case IEEE80211_EDMG_BW_CONFIG_9: |
125 | case IEEE80211_EDMG_BW_CONFIG_10: |
126 | case IEEE80211_EDMG_BW_CONFIG_11: |
127 | if (num_of_enabled < 2) |
128 | return false; |
129 | break; |
130 | case IEEE80211_EDMG_BW_CONFIG_12: |
131 | case IEEE80211_EDMG_BW_CONFIG_13: |
132 | case IEEE80211_EDMG_BW_CONFIG_14: |
133 | case IEEE80211_EDMG_BW_CONFIG_15: |
134 | if (num_of_enabled < 4 || max_contiguous < 2) |
135 | return false; |
136 | break; |
137 | default: |
138 | return false; |
139 | } |
140 | |
141 | return true; |
142 | } |
143 | |
144 | static int nl80211_chan_width_to_mhz(enum nl80211_chan_width chan_width) |
145 | { |
146 | int mhz; |
147 | |
148 | switch (chan_width) { |
149 | case NL80211_CHAN_WIDTH_1: |
150 | mhz = 1; |
151 | break; |
152 | case NL80211_CHAN_WIDTH_2: |
153 | mhz = 2; |
154 | break; |
155 | case NL80211_CHAN_WIDTH_4: |
156 | mhz = 4; |
157 | break; |
158 | case NL80211_CHAN_WIDTH_8: |
159 | mhz = 8; |
160 | break; |
161 | case NL80211_CHAN_WIDTH_16: |
162 | mhz = 16; |
163 | break; |
164 | case NL80211_CHAN_WIDTH_5: |
165 | mhz = 5; |
166 | break; |
167 | case NL80211_CHAN_WIDTH_10: |
168 | mhz = 10; |
169 | break; |
170 | case NL80211_CHAN_WIDTH_20: |
171 | case NL80211_CHAN_WIDTH_20_NOHT: |
172 | mhz = 20; |
173 | break; |
174 | case NL80211_CHAN_WIDTH_40: |
175 | mhz = 40; |
176 | break; |
177 | case NL80211_CHAN_WIDTH_80P80: |
178 | case NL80211_CHAN_WIDTH_80: |
179 | mhz = 80; |
180 | break; |
181 | case NL80211_CHAN_WIDTH_160: |
182 | mhz = 160; |
183 | break; |
184 | case NL80211_CHAN_WIDTH_320: |
185 | mhz = 320; |
186 | break; |
187 | default: |
188 | WARN_ON_ONCE(1); |
189 | return -1; |
190 | } |
191 | return mhz; |
192 | } |
193 | |
194 | static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) |
195 | { |
196 | return nl80211_chan_width_to_mhz(chan_width: c->width); |
197 | } |
198 | |
199 | bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) |
200 | { |
201 | u32 control_freq, oper_freq; |
202 | int oper_width, control_width; |
203 | |
204 | if (!chandef->chan) |
205 | return false; |
206 | |
207 | if (chandef->freq1_offset >= 1000) |
208 | return false; |
209 | |
210 | control_freq = chandef->chan->center_freq; |
211 | |
212 | switch (chandef->width) { |
213 | case NL80211_CHAN_WIDTH_5: |
214 | case NL80211_CHAN_WIDTH_10: |
215 | case NL80211_CHAN_WIDTH_20: |
216 | case NL80211_CHAN_WIDTH_20_NOHT: |
217 | if (ieee80211_chandef_to_khz(chandef) != |
218 | ieee80211_channel_to_khz(chan: chandef->chan)) |
219 | return false; |
220 | if (chandef->center_freq2) |
221 | return false; |
222 | break; |
223 | case NL80211_CHAN_WIDTH_1: |
224 | case NL80211_CHAN_WIDTH_2: |
225 | case NL80211_CHAN_WIDTH_4: |
226 | case NL80211_CHAN_WIDTH_8: |
227 | case NL80211_CHAN_WIDTH_16: |
228 | if (chandef->chan->band != NL80211_BAND_S1GHZ) |
229 | return false; |
230 | |
231 | control_freq = ieee80211_channel_to_khz(chan: chandef->chan); |
232 | oper_freq = ieee80211_chandef_to_khz(chandef); |
233 | control_width = nl80211_chan_width_to_mhz( |
234 | chan_width: ieee80211_s1g_channel_width( |
235 | chan: chandef->chan)); |
236 | oper_width = cfg80211_chandef_get_width(c: chandef); |
237 | |
238 | if (oper_width < 0 || control_width < 0) |
239 | return false; |
240 | if (chandef->center_freq2) |
241 | return false; |
242 | |
243 | if (control_freq + MHZ_TO_KHZ(control_width) / 2 > |
244 | oper_freq + MHZ_TO_KHZ(oper_width) / 2) |
245 | return false; |
246 | |
247 | if (control_freq - MHZ_TO_KHZ(control_width) / 2 < |
248 | oper_freq - MHZ_TO_KHZ(oper_width) / 2) |
249 | return false; |
250 | break; |
251 | case NL80211_CHAN_WIDTH_80P80: |
252 | if (!chandef->center_freq2) |
253 | return false; |
254 | /* adjacent is not allowed -- that's a 160 MHz channel */ |
255 | if (chandef->center_freq1 - chandef->center_freq2 == 80 || |
256 | chandef->center_freq2 - chandef->center_freq1 == 80) |
257 | return false; |
258 | break; |
259 | default: |
260 | if (chandef->center_freq2) |
261 | return false; |
262 | break; |
263 | } |
264 | |
265 | switch (chandef->width) { |
266 | case NL80211_CHAN_WIDTH_5: |
267 | case NL80211_CHAN_WIDTH_10: |
268 | case NL80211_CHAN_WIDTH_20: |
269 | case NL80211_CHAN_WIDTH_20_NOHT: |
270 | case NL80211_CHAN_WIDTH_1: |
271 | case NL80211_CHAN_WIDTH_2: |
272 | case NL80211_CHAN_WIDTH_4: |
273 | case NL80211_CHAN_WIDTH_8: |
274 | case NL80211_CHAN_WIDTH_16: |
275 | /* all checked above */ |
276 | break; |
277 | case NL80211_CHAN_WIDTH_320: |
278 | if (chandef->center_freq1 == control_freq + 150 || |
279 | chandef->center_freq1 == control_freq + 130 || |
280 | chandef->center_freq1 == control_freq + 110 || |
281 | chandef->center_freq1 == control_freq + 90 || |
282 | chandef->center_freq1 == control_freq - 90 || |
283 | chandef->center_freq1 == control_freq - 110 || |
284 | chandef->center_freq1 == control_freq - 130 || |
285 | chandef->center_freq1 == control_freq - 150) |
286 | break; |
287 | fallthrough; |
288 | case NL80211_CHAN_WIDTH_160: |
289 | if (chandef->center_freq1 == control_freq + 70 || |
290 | chandef->center_freq1 == control_freq + 50 || |
291 | chandef->center_freq1 == control_freq - 50 || |
292 | chandef->center_freq1 == control_freq - 70) |
293 | break; |
294 | fallthrough; |
295 | case NL80211_CHAN_WIDTH_80P80: |
296 | case NL80211_CHAN_WIDTH_80: |
297 | if (chandef->center_freq1 == control_freq + 30 || |
298 | chandef->center_freq1 == control_freq - 30) |
299 | break; |
300 | fallthrough; |
301 | case NL80211_CHAN_WIDTH_40: |
302 | if (chandef->center_freq1 == control_freq + 10 || |
303 | chandef->center_freq1 == control_freq - 10) |
304 | break; |
305 | fallthrough; |
306 | default: |
307 | return false; |
308 | } |
309 | |
310 | /* channel 14 is only for IEEE 802.11b */ |
311 | if (chandef->center_freq1 == 2484 && |
312 | chandef->width != NL80211_CHAN_WIDTH_20_NOHT) |
313 | return false; |
314 | |
315 | if (cfg80211_chandef_is_edmg(chandef) && |
316 | !cfg80211_edmg_chandef_valid(chandef)) |
317 | return false; |
318 | |
319 | return true; |
320 | } |
321 | EXPORT_SYMBOL(cfg80211_chandef_valid); |
322 | |
323 | static void chandef_primary_freqs(const struct cfg80211_chan_def *c, |
324 | u32 *pri40, u32 *pri80, u32 *pri160) |
325 | { |
326 | int tmp; |
327 | |
328 | switch (c->width) { |
329 | case NL80211_CHAN_WIDTH_40: |
330 | *pri40 = c->center_freq1; |
331 | *pri80 = 0; |
332 | *pri160 = 0; |
333 | break; |
334 | case NL80211_CHAN_WIDTH_80: |
335 | case NL80211_CHAN_WIDTH_80P80: |
336 | *pri160 = 0; |
337 | *pri80 = c->center_freq1; |
338 | /* n_P20 */ |
339 | tmp = (30 + c->chan->center_freq - c->center_freq1)/20; |
340 | /* n_P40 */ |
341 | tmp /= 2; |
342 | /* freq_P40 */ |
343 | *pri40 = c->center_freq1 - 20 + 40 * tmp; |
344 | break; |
345 | case NL80211_CHAN_WIDTH_160: |
346 | *pri160 = c->center_freq1; |
347 | /* n_P20 */ |
348 | tmp = (70 + c->chan->center_freq - c->center_freq1)/20; |
349 | /* n_P40 */ |
350 | tmp /= 2; |
351 | /* freq_P40 */ |
352 | *pri40 = c->center_freq1 - 60 + 40 * tmp; |
353 | /* n_P80 */ |
354 | tmp /= 2; |
355 | *pri80 = c->center_freq1 - 40 + 80 * tmp; |
356 | break; |
357 | case NL80211_CHAN_WIDTH_320: |
358 | /* n_P20 */ |
359 | tmp = (150 + c->chan->center_freq - c->center_freq1) / 20; |
360 | /* n_P40 */ |
361 | tmp /= 2; |
362 | /* freq_P40 */ |
363 | *pri40 = c->center_freq1 - 140 + 40 * tmp; |
364 | /* n_P80 */ |
365 | tmp /= 2; |
366 | *pri80 = c->center_freq1 - 120 + 80 * tmp; |
367 | /* n_P160 */ |
368 | tmp /= 2; |
369 | *pri160 = c->center_freq1 - 80 + 160 * tmp; |
370 | break; |
371 | default: |
372 | WARN_ON_ONCE(1); |
373 | } |
374 | } |
375 | |
376 | const struct cfg80211_chan_def * |
377 | cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, |
378 | const struct cfg80211_chan_def *c2) |
379 | { |
380 | u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80, c1_pri160, c2_pri160; |
381 | |
382 | /* If they are identical, return */ |
383 | if (cfg80211_chandef_identical(chandef1: c1, chandef2: c2)) |
384 | return c1; |
385 | |
386 | /* otherwise, must have same control channel */ |
387 | if (c1->chan != c2->chan) |
388 | return NULL; |
389 | |
390 | /* |
391 | * If they have the same width, but aren't identical, |
392 | * then they can't be compatible. |
393 | */ |
394 | if (c1->width == c2->width) |
395 | return NULL; |
396 | |
397 | /* |
398 | * can't be compatible if one of them is 5 or 10 MHz, |
399 | * but they don't have the same width. |
400 | */ |
401 | if (c1->width == NL80211_CHAN_WIDTH_5 || |
402 | c1->width == NL80211_CHAN_WIDTH_10 || |
403 | c2->width == NL80211_CHAN_WIDTH_5 || |
404 | c2->width == NL80211_CHAN_WIDTH_10) |
405 | return NULL; |
406 | |
407 | if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || |
408 | c1->width == NL80211_CHAN_WIDTH_20) |
409 | return c2; |
410 | |
411 | if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || |
412 | c2->width == NL80211_CHAN_WIDTH_20) |
413 | return c1; |
414 | |
415 | chandef_primary_freqs(c: c1, pri40: &c1_pri40, pri80: &c1_pri80, pri160: &c1_pri160); |
416 | chandef_primary_freqs(c: c2, pri40: &c2_pri40, pri80: &c2_pri80, pri160: &c2_pri160); |
417 | |
418 | if (c1_pri40 != c2_pri40) |
419 | return NULL; |
420 | |
421 | if (c1->width == NL80211_CHAN_WIDTH_40) |
422 | return c2; |
423 | |
424 | if (c2->width == NL80211_CHAN_WIDTH_40) |
425 | return c1; |
426 | |
427 | if (c1_pri80 != c2_pri80) |
428 | return NULL; |
429 | |
430 | if (c1->width == NL80211_CHAN_WIDTH_80 && |
431 | c2->width > NL80211_CHAN_WIDTH_80) |
432 | return c2; |
433 | |
434 | if (c2->width == NL80211_CHAN_WIDTH_80 && |
435 | c1->width > NL80211_CHAN_WIDTH_80) |
436 | return c1; |
437 | |
438 | WARN_ON(!c1_pri160 && !c2_pri160); |
439 | if (c1_pri160 && c2_pri160 && c1_pri160 != c2_pri160) |
440 | return NULL; |
441 | |
442 | if (c1->width > c2->width) |
443 | return c1; |
444 | return c2; |
445 | } |
446 | EXPORT_SYMBOL(cfg80211_chandef_compatible); |
447 | |
448 | static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, |
449 | u32 bandwidth, |
450 | enum nl80211_dfs_state dfs_state) |
451 | { |
452 | struct ieee80211_channel *c; |
453 | u32 freq; |
454 | |
455 | for (freq = center_freq - bandwidth/2 + 10; |
456 | freq <= center_freq + bandwidth/2 - 10; |
457 | freq += 20) { |
458 | c = ieee80211_get_channel(wiphy, freq); |
459 | if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) |
460 | continue; |
461 | |
462 | c->dfs_state = dfs_state; |
463 | c->dfs_state_entered = jiffies; |
464 | } |
465 | } |
466 | |
467 | void cfg80211_set_dfs_state(struct wiphy *wiphy, |
468 | const struct cfg80211_chan_def *chandef, |
469 | enum nl80211_dfs_state dfs_state) |
470 | { |
471 | int width; |
472 | |
473 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) |
474 | return; |
475 | |
476 | width = cfg80211_chandef_get_width(c: chandef); |
477 | if (width < 0) |
478 | return; |
479 | |
480 | cfg80211_set_chans_dfs_state(wiphy, center_freq: chandef->center_freq1, |
481 | bandwidth: width, dfs_state); |
482 | |
483 | if (!chandef->center_freq2) |
484 | return; |
485 | cfg80211_set_chans_dfs_state(wiphy, center_freq: chandef->center_freq2, |
486 | bandwidth: width, dfs_state); |
487 | } |
488 | |
489 | static u32 cfg80211_get_start_freq(u32 center_freq, |
490 | u32 bandwidth) |
491 | { |
492 | u32 start_freq; |
493 | |
494 | bandwidth = MHZ_TO_KHZ(bandwidth); |
495 | if (bandwidth <= MHZ_TO_KHZ(20)) |
496 | start_freq = center_freq; |
497 | else |
498 | start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10); |
499 | |
500 | return start_freq; |
501 | } |
502 | |
503 | static u32 cfg80211_get_end_freq(u32 center_freq, |
504 | u32 bandwidth) |
505 | { |
506 | u32 end_freq; |
507 | |
508 | bandwidth = MHZ_TO_KHZ(bandwidth); |
509 | if (bandwidth <= MHZ_TO_KHZ(20)) |
510 | end_freq = center_freq; |
511 | else |
512 | end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10); |
513 | |
514 | return end_freq; |
515 | } |
516 | |
517 | static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, |
518 | u32 center_freq, |
519 | u32 bandwidth) |
520 | { |
521 | struct ieee80211_channel *c; |
522 | u32 freq, start_freq, end_freq; |
523 | |
524 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); |
525 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); |
526 | |
527 | for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { |
528 | c = ieee80211_get_channel_khz(wiphy, freq); |
529 | if (!c) |
530 | return -EINVAL; |
531 | |
532 | if (c->flags & IEEE80211_CHAN_RADAR) |
533 | return 1; |
534 | } |
535 | return 0; |
536 | } |
537 | |
538 | |
539 | int cfg80211_chandef_dfs_required(struct wiphy *wiphy, |
540 | const struct cfg80211_chan_def *chandef, |
541 | enum nl80211_iftype iftype) |
542 | { |
543 | int width; |
544 | int ret; |
545 | |
546 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) |
547 | return -EINVAL; |
548 | |
549 | switch (iftype) { |
550 | case NL80211_IFTYPE_ADHOC: |
551 | case NL80211_IFTYPE_AP: |
552 | case NL80211_IFTYPE_P2P_GO: |
553 | case NL80211_IFTYPE_MESH_POINT: |
554 | width = cfg80211_chandef_get_width(c: chandef); |
555 | if (width < 0) |
556 | return -EINVAL; |
557 | |
558 | ret = cfg80211_get_chans_dfs_required(wiphy, |
559 | center_freq: ieee80211_chandef_to_khz(chandef), |
560 | bandwidth: width); |
561 | if (ret < 0) |
562 | return ret; |
563 | else if (ret > 0) |
564 | return BIT(chandef->width); |
565 | |
566 | if (!chandef->center_freq2) |
567 | return 0; |
568 | |
569 | ret = cfg80211_get_chans_dfs_required(wiphy, |
570 | MHZ_TO_KHZ(chandef->center_freq2), |
571 | bandwidth: width); |
572 | if (ret < 0) |
573 | return ret; |
574 | else if (ret > 0) |
575 | return BIT(chandef->width); |
576 | |
577 | break; |
578 | case NL80211_IFTYPE_STATION: |
579 | case NL80211_IFTYPE_OCB: |
580 | case NL80211_IFTYPE_P2P_CLIENT: |
581 | case NL80211_IFTYPE_MONITOR: |
582 | case NL80211_IFTYPE_AP_VLAN: |
583 | case NL80211_IFTYPE_P2P_DEVICE: |
584 | case NL80211_IFTYPE_NAN: |
585 | break; |
586 | case NL80211_IFTYPE_WDS: |
587 | case NL80211_IFTYPE_UNSPECIFIED: |
588 | case NUM_NL80211_IFTYPES: |
589 | WARN_ON(1); |
590 | } |
591 | |
592 | return 0; |
593 | } |
594 | EXPORT_SYMBOL(cfg80211_chandef_dfs_required); |
595 | |
596 | static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, |
597 | u32 center_freq, |
598 | u32 bandwidth) |
599 | { |
600 | struct ieee80211_channel *c; |
601 | u32 freq, start_freq, end_freq; |
602 | int count = 0; |
603 | |
604 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); |
605 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); |
606 | |
607 | /* |
608 | * Check entire range of channels for the bandwidth. |
609 | * Check all channels are DFS channels (DFS_USABLE or |
610 | * DFS_AVAILABLE). Return number of usable channels |
611 | * (require CAC). Allow DFS and non-DFS channel mix. |
612 | */ |
613 | for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { |
614 | c = ieee80211_get_channel_khz(wiphy, freq); |
615 | if (!c) |
616 | return -EINVAL; |
617 | |
618 | if (c->flags & IEEE80211_CHAN_DISABLED) |
619 | return -EINVAL; |
620 | |
621 | if (c->flags & IEEE80211_CHAN_RADAR) { |
622 | if (c->dfs_state == NL80211_DFS_UNAVAILABLE) |
623 | return -EINVAL; |
624 | |
625 | if (c->dfs_state == NL80211_DFS_USABLE) |
626 | count++; |
627 | } |
628 | } |
629 | |
630 | return count; |
631 | } |
632 | |
633 | bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, |
634 | const struct cfg80211_chan_def *chandef) |
635 | { |
636 | int width; |
637 | int r1, r2 = 0; |
638 | |
639 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) |
640 | return false; |
641 | |
642 | width = cfg80211_chandef_get_width(c: chandef); |
643 | if (width < 0) |
644 | return false; |
645 | |
646 | r1 = cfg80211_get_chans_dfs_usable(wiphy, |
647 | MHZ_TO_KHZ(chandef->center_freq1), |
648 | bandwidth: width); |
649 | |
650 | if (r1 < 0) |
651 | return false; |
652 | |
653 | switch (chandef->width) { |
654 | case NL80211_CHAN_WIDTH_80P80: |
655 | WARN_ON(!chandef->center_freq2); |
656 | r2 = cfg80211_get_chans_dfs_usable(wiphy, |
657 | MHZ_TO_KHZ(chandef->center_freq2), |
658 | bandwidth: width); |
659 | if (r2 < 0) |
660 | return false; |
661 | break; |
662 | default: |
663 | WARN_ON(chandef->center_freq2); |
664 | break; |
665 | } |
666 | |
667 | return (r1 + r2 > 0); |
668 | } |
669 | EXPORT_SYMBOL(cfg80211_chandef_dfs_usable); |
670 | |
671 | /* |
672 | * Checks if center frequency of chan falls with in the bandwidth |
673 | * range of chandef. |
674 | */ |
675 | bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef, |
676 | struct ieee80211_channel *chan, |
677 | bool primary_only) |
678 | { |
679 | int width; |
680 | u32 freq; |
681 | |
682 | if (!chandef->chan) |
683 | return false; |
684 | |
685 | if (chandef->chan->center_freq == chan->center_freq) |
686 | return true; |
687 | |
688 | if (primary_only) |
689 | return false; |
690 | |
691 | width = cfg80211_chandef_get_width(c: chandef); |
692 | if (width <= 20) |
693 | return false; |
694 | |
695 | for (freq = chandef->center_freq1 - width / 2 + 10; |
696 | freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) { |
697 | if (chan->center_freq == freq) |
698 | return true; |
699 | } |
700 | |
701 | if (!chandef->center_freq2) |
702 | return false; |
703 | |
704 | for (freq = chandef->center_freq2 - width / 2 + 10; |
705 | freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) { |
706 | if (chan->center_freq == freq) |
707 | return true; |
708 | } |
709 | |
710 | return false; |
711 | } |
712 | |
713 | bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) |
714 | { |
715 | unsigned int link; |
716 | |
717 | lockdep_assert_wiphy(wdev->wiphy); |
718 | |
719 | switch (wdev->iftype) { |
720 | case NL80211_IFTYPE_AP: |
721 | case NL80211_IFTYPE_P2P_GO: |
722 | for_each_valid_link(wdev, link) { |
723 | if (wdev->links[link].ap.beacon_interval) |
724 | return true; |
725 | } |
726 | break; |
727 | case NL80211_IFTYPE_ADHOC: |
728 | if (wdev->u.ibss.ssid_len) |
729 | return true; |
730 | break; |
731 | case NL80211_IFTYPE_MESH_POINT: |
732 | if (wdev->u.mesh.id_len) |
733 | return true; |
734 | break; |
735 | case NL80211_IFTYPE_STATION: |
736 | case NL80211_IFTYPE_OCB: |
737 | case NL80211_IFTYPE_P2P_CLIENT: |
738 | case NL80211_IFTYPE_MONITOR: |
739 | case NL80211_IFTYPE_AP_VLAN: |
740 | case NL80211_IFTYPE_P2P_DEVICE: |
741 | /* Can NAN type be considered as beaconing interface? */ |
742 | case NL80211_IFTYPE_NAN: |
743 | break; |
744 | case NL80211_IFTYPE_UNSPECIFIED: |
745 | case NL80211_IFTYPE_WDS: |
746 | case NUM_NL80211_IFTYPES: |
747 | WARN_ON(1); |
748 | } |
749 | |
750 | return false; |
751 | } |
752 | |
753 | bool cfg80211_wdev_on_sub_chan(struct wireless_dev *wdev, |
754 | struct ieee80211_channel *chan, |
755 | bool primary_only) |
756 | { |
757 | unsigned int link; |
758 | |
759 | switch (wdev->iftype) { |
760 | case NL80211_IFTYPE_AP: |
761 | case NL80211_IFTYPE_P2P_GO: |
762 | for_each_valid_link(wdev, link) { |
763 | if (cfg80211_is_sub_chan(chandef: &wdev->links[link].ap.chandef, |
764 | chan, primary_only)) |
765 | return true; |
766 | } |
767 | break; |
768 | case NL80211_IFTYPE_ADHOC: |
769 | return cfg80211_is_sub_chan(chandef: &wdev->u.ibss.chandef, chan, |
770 | primary_only); |
771 | case NL80211_IFTYPE_MESH_POINT: |
772 | return cfg80211_is_sub_chan(chandef: &wdev->u.mesh.chandef, chan, |
773 | primary_only); |
774 | default: |
775 | break; |
776 | } |
777 | |
778 | return false; |
779 | } |
780 | |
781 | static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy, |
782 | struct ieee80211_channel *chan) |
783 | { |
784 | struct wireless_dev *wdev; |
785 | |
786 | lockdep_assert_wiphy(wiphy); |
787 | |
788 | list_for_each_entry(wdev, &wiphy->wdev_list, list) { |
789 | if (!cfg80211_beaconing_iface_active(wdev)) |
790 | continue; |
791 | |
792 | if (cfg80211_wdev_on_sub_chan(wdev, chan, primary_only: false)) |
793 | return true; |
794 | } |
795 | |
796 | return false; |
797 | } |
798 | |
799 | static bool |
800 | cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev, |
801 | struct ieee80211_channel *channel) |
802 | { |
803 | if (!rdev->background_radar_wdev) |
804 | return false; |
805 | |
806 | if (!cfg80211_chandef_valid(&rdev->background_radar_chandef)) |
807 | return false; |
808 | |
809 | return cfg80211_is_sub_chan(chandef: &rdev->background_radar_chandef, chan: channel, |
810 | primary_only: false); |
811 | } |
812 | |
813 | bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, |
814 | struct ieee80211_channel *chan) |
815 | { |
816 | struct cfg80211_registered_device *rdev; |
817 | |
818 | ASSERT_RTNL(); |
819 | |
820 | if (!(chan->flags & IEEE80211_CHAN_RADAR)) |
821 | return false; |
822 | |
823 | for_each_rdev(rdev) { |
824 | bool found; |
825 | |
826 | if (!reg_dfs_domain_same(wiphy1: wiphy, wiphy2: &rdev->wiphy)) |
827 | continue; |
828 | |
829 | wiphy_lock(wiphy: &rdev->wiphy); |
830 | found = cfg80211_is_wiphy_oper_chan(wiphy: &rdev->wiphy, chan) || |
831 | cfg80211_offchan_chain_is_active(rdev, channel: chan); |
832 | wiphy_unlock(wiphy: &rdev->wiphy); |
833 | |
834 | if (found) |
835 | return true; |
836 | } |
837 | |
838 | return false; |
839 | } |
840 | |
841 | static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, |
842 | u32 center_freq, |
843 | u32 bandwidth) |
844 | { |
845 | struct ieee80211_channel *c; |
846 | u32 freq, start_freq, end_freq; |
847 | bool dfs_offload; |
848 | |
849 | dfs_offload = wiphy_ext_feature_isset(wiphy, |
850 | ftidx: NL80211_EXT_FEATURE_DFS_OFFLOAD); |
851 | |
852 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); |
853 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); |
854 | |
855 | /* |
856 | * Check entire range of channels for the bandwidth. |
857 | * If any channel in between is disabled or has not |
858 | * had gone through CAC return false |
859 | */ |
860 | for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { |
861 | c = ieee80211_get_channel_khz(wiphy, freq); |
862 | if (!c) |
863 | return false; |
864 | |
865 | if (c->flags & IEEE80211_CHAN_DISABLED) |
866 | return false; |
867 | |
868 | if ((c->flags & IEEE80211_CHAN_RADAR) && |
869 | (c->dfs_state != NL80211_DFS_AVAILABLE) && |
870 | !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload)) |
871 | return false; |
872 | } |
873 | |
874 | return true; |
875 | } |
876 | |
877 | static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, |
878 | const struct cfg80211_chan_def *chandef) |
879 | { |
880 | int width; |
881 | int r; |
882 | |
883 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) |
884 | return false; |
885 | |
886 | width = cfg80211_chandef_get_width(c: chandef); |
887 | if (width < 0) |
888 | return false; |
889 | |
890 | r = cfg80211_get_chans_dfs_available(wiphy, |
891 | MHZ_TO_KHZ(chandef->center_freq1), |
892 | bandwidth: width); |
893 | |
894 | /* If any of channels unavailable for cf1 just return */ |
895 | if (!r) |
896 | return r; |
897 | |
898 | switch (chandef->width) { |
899 | case NL80211_CHAN_WIDTH_80P80: |
900 | WARN_ON(!chandef->center_freq2); |
901 | r = cfg80211_get_chans_dfs_available(wiphy, |
902 | MHZ_TO_KHZ(chandef->center_freq2), |
903 | bandwidth: width); |
904 | break; |
905 | default: |
906 | WARN_ON(chandef->center_freq2); |
907 | break; |
908 | } |
909 | |
910 | return r; |
911 | } |
912 | |
913 | static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, |
914 | u32 center_freq, |
915 | u32 bandwidth) |
916 | { |
917 | struct ieee80211_channel *c; |
918 | u32 start_freq, end_freq, freq; |
919 | unsigned int dfs_cac_ms = 0; |
920 | |
921 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); |
922 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); |
923 | |
924 | for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { |
925 | c = ieee80211_get_channel_khz(wiphy, freq); |
926 | if (!c) |
927 | return 0; |
928 | |
929 | if (c->flags & IEEE80211_CHAN_DISABLED) |
930 | return 0; |
931 | |
932 | if (!(c->flags & IEEE80211_CHAN_RADAR)) |
933 | continue; |
934 | |
935 | if (c->dfs_cac_ms > dfs_cac_ms) |
936 | dfs_cac_ms = c->dfs_cac_ms; |
937 | } |
938 | |
939 | return dfs_cac_ms; |
940 | } |
941 | |
942 | unsigned int |
943 | cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, |
944 | const struct cfg80211_chan_def *chandef) |
945 | { |
946 | int width; |
947 | unsigned int t1 = 0, t2 = 0; |
948 | |
949 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) |
950 | return 0; |
951 | |
952 | width = cfg80211_chandef_get_width(c: chandef); |
953 | if (width < 0) |
954 | return 0; |
955 | |
956 | t1 = cfg80211_get_chans_dfs_cac_time(wiphy, |
957 | MHZ_TO_KHZ(chandef->center_freq1), |
958 | bandwidth: width); |
959 | |
960 | if (!chandef->center_freq2) |
961 | return t1; |
962 | |
963 | t2 = cfg80211_get_chans_dfs_cac_time(wiphy, |
964 | MHZ_TO_KHZ(chandef->center_freq2), |
965 | bandwidth: width); |
966 | |
967 | return max(t1, t2); |
968 | } |
969 | EXPORT_SYMBOL(cfg80211_chandef_dfs_cac_time); |
970 | |
971 | static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, |
972 | u32 center_freq, u32 bandwidth, |
973 | u32 prohibited_flags) |
974 | { |
975 | struct ieee80211_channel *c; |
976 | u32 freq, start_freq, end_freq; |
977 | |
978 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); |
979 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); |
980 | |
981 | for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { |
982 | c = ieee80211_get_channel_khz(wiphy, freq); |
983 | if (!c || c->flags & prohibited_flags) |
984 | return false; |
985 | } |
986 | |
987 | return true; |
988 | } |
989 | |
990 | /* check if the operating channels are valid and supported */ |
991 | static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels, |
992 | enum ieee80211_edmg_bw_config edmg_bw_config, |
993 | int primary_channel, |
994 | struct ieee80211_edmg *edmg_cap) |
995 | { |
996 | struct ieee80211_channel *chan; |
997 | int i, freq; |
998 | int channels_counter = 0; |
999 | |
1000 | if (!edmg_channels && !edmg_bw_config) |
1001 | return true; |
1002 | |
1003 | if ((!edmg_channels && edmg_bw_config) || |
1004 | (edmg_channels && !edmg_bw_config)) |
1005 | return false; |
1006 | |
1007 | if (!(edmg_channels & BIT(primary_channel - 1))) |
1008 | return false; |
1009 | |
1010 | /* 60GHz channels 1..6 */ |
1011 | for (i = 0; i < 6; i++) { |
1012 | if (!(edmg_channels & BIT(i))) |
1013 | continue; |
1014 | |
1015 | if (!(edmg_cap->channels & BIT(i))) |
1016 | return false; |
1017 | |
1018 | channels_counter++; |
1019 | |
1020 | freq = ieee80211_channel_to_frequency(chan: i + 1, |
1021 | band: NL80211_BAND_60GHZ); |
1022 | chan = ieee80211_get_channel(wiphy, freq); |
1023 | if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) |
1024 | return false; |
1025 | } |
1026 | |
1027 | /* IEEE802.11 allows max 4 channels */ |
1028 | if (channels_counter > 4) |
1029 | return false; |
1030 | |
1031 | /* check bw_config is a subset of what driver supports |
1032 | * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13) |
1033 | */ |
1034 | if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4)) |
1035 | return false; |
1036 | |
1037 | if (edmg_bw_config > edmg_cap->bw_config) |
1038 | return false; |
1039 | |
1040 | return true; |
1041 | } |
1042 | |
1043 | bool cfg80211_chandef_usable(struct wiphy *wiphy, |
1044 | const struct cfg80211_chan_def *chandef, |
1045 | u32 prohibited_flags) |
1046 | { |
1047 | struct ieee80211_sta_ht_cap *ht_cap; |
1048 | struct ieee80211_sta_vht_cap *vht_cap; |
1049 | struct ieee80211_edmg *edmg_cap; |
1050 | u32 width, control_freq, cap; |
1051 | bool ext_nss_cap, support_80_80 = false, support_320 = false; |
1052 | const struct ieee80211_sband_iftype_data *iftd; |
1053 | struct ieee80211_supported_band *sband; |
1054 | int i; |
1055 | |
1056 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) |
1057 | return false; |
1058 | |
1059 | ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; |
1060 | vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; |
1061 | edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap; |
1062 | ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) & |
1063 | IEEE80211_VHT_EXT_NSS_BW_CAPABLE; |
1064 | |
1065 | if (edmg_cap->channels && |
1066 | !cfg80211_edmg_usable(wiphy, |
1067 | edmg_channels: chandef->edmg.channels, |
1068 | edmg_bw_config: chandef->edmg.bw_config, |
1069 | primary_channel: chandef->chan->hw_value, |
1070 | edmg_cap)) |
1071 | return false; |
1072 | |
1073 | control_freq = chandef->chan->center_freq; |
1074 | |
1075 | switch (chandef->width) { |
1076 | case NL80211_CHAN_WIDTH_1: |
1077 | width = 1; |
1078 | break; |
1079 | case NL80211_CHAN_WIDTH_2: |
1080 | width = 2; |
1081 | break; |
1082 | case NL80211_CHAN_WIDTH_4: |
1083 | width = 4; |
1084 | break; |
1085 | case NL80211_CHAN_WIDTH_8: |
1086 | width = 8; |
1087 | break; |
1088 | case NL80211_CHAN_WIDTH_16: |
1089 | width = 16; |
1090 | break; |
1091 | case NL80211_CHAN_WIDTH_5: |
1092 | width = 5; |
1093 | break; |
1094 | case NL80211_CHAN_WIDTH_10: |
1095 | prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; |
1096 | width = 10; |
1097 | break; |
1098 | case NL80211_CHAN_WIDTH_20: |
1099 | if (!ht_cap->ht_supported && |
1100 | chandef->chan->band != NL80211_BAND_6GHZ) |
1101 | return false; |
1102 | fallthrough; |
1103 | case NL80211_CHAN_WIDTH_20_NOHT: |
1104 | prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; |
1105 | width = 20; |
1106 | break; |
1107 | case NL80211_CHAN_WIDTH_40: |
1108 | width = 40; |
1109 | if (chandef->chan->band == NL80211_BAND_6GHZ) |
1110 | break; |
1111 | if (!ht_cap->ht_supported) |
1112 | return false; |
1113 | if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || |
1114 | ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) |
1115 | return false; |
1116 | if (chandef->center_freq1 < control_freq && |
1117 | chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) |
1118 | return false; |
1119 | if (chandef->center_freq1 > control_freq && |
1120 | chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) |
1121 | return false; |
1122 | break; |
1123 | case NL80211_CHAN_WIDTH_80P80: |
1124 | cap = vht_cap->cap; |
1125 | support_80_80 = |
1126 | (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) || |
1127 | (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && |
1128 | cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) || |
1129 | (ext_nss_cap && |
1130 | u32_get_bits(v: cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1); |
1131 | if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80) |
1132 | return false; |
1133 | fallthrough; |
1134 | case NL80211_CHAN_WIDTH_80: |
1135 | prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; |
1136 | width = 80; |
1137 | if (chandef->chan->band == NL80211_BAND_6GHZ) |
1138 | break; |
1139 | if (!vht_cap->vht_supported) |
1140 | return false; |
1141 | break; |
1142 | case NL80211_CHAN_WIDTH_160: |
1143 | prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; |
1144 | width = 160; |
1145 | if (chandef->chan->band == NL80211_BAND_6GHZ) |
1146 | break; |
1147 | if (!vht_cap->vht_supported) |
1148 | return false; |
1149 | cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; |
1150 | if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && |
1151 | cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ && |
1152 | !(ext_nss_cap && |
1153 | (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))) |
1154 | return false; |
1155 | break; |
1156 | case NL80211_CHAN_WIDTH_320: |
1157 | prohibited_flags |= IEEE80211_CHAN_NO_320MHZ; |
1158 | width = 320; |
1159 | |
1160 | if (chandef->chan->band != NL80211_BAND_6GHZ) |
1161 | return false; |
1162 | |
1163 | sband = wiphy->bands[NL80211_BAND_6GHZ]; |
1164 | if (!sband) |
1165 | return false; |
1166 | |
1167 | for_each_sband_iftype_data(sband, i, iftd) { |
1168 | if (!iftd->eht_cap.has_eht) |
1169 | continue; |
1170 | |
1171 | if (iftd->eht_cap.eht_cap_elem.phy_cap_info[0] & |
1172 | IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) { |
1173 | support_320 = true; |
1174 | break; |
1175 | } |
1176 | } |
1177 | |
1178 | if (!support_320) |
1179 | return false; |
1180 | break; |
1181 | default: |
1182 | WARN_ON_ONCE(1); |
1183 | return false; |
1184 | } |
1185 | |
1186 | /* |
1187 | * TODO: What if there are only certain 80/160/80+80 MHz channels |
1188 | * allowed by the driver, or only certain combinations? |
1189 | * For 40 MHz the driver can set the NO_HT40 flags, but for |
1190 | * 80/160 MHz and in particular 80+80 MHz this isn't really |
1191 | * feasible and we only have NO_80MHZ/NO_160MHZ so far but |
1192 | * no way to cover 80+80 MHz or more complex restrictions. |
1193 | * Note that such restrictions also need to be advertised to |
1194 | * userspace, for example for P2P channel selection. |
1195 | */ |
1196 | |
1197 | if (width > 20) |
1198 | prohibited_flags |= IEEE80211_CHAN_NO_OFDM; |
1199 | |
1200 | /* 5 and 10 MHz are only defined for the OFDM PHY */ |
1201 | if (width < 20) |
1202 | prohibited_flags |= IEEE80211_CHAN_NO_OFDM; |
1203 | |
1204 | |
1205 | if (!cfg80211_secondary_chans_ok(wiphy, |
1206 | center_freq: ieee80211_chandef_to_khz(chandef), |
1207 | bandwidth: width, prohibited_flags)) |
1208 | return false; |
1209 | |
1210 | if (!chandef->center_freq2) |
1211 | return true; |
1212 | return cfg80211_secondary_chans_ok(wiphy, |
1213 | MHZ_TO_KHZ(chandef->center_freq2), |
1214 | bandwidth: width, prohibited_flags); |
1215 | } |
1216 | EXPORT_SYMBOL(cfg80211_chandef_usable); |
1217 | |
1218 | static bool cfg80211_ir_permissive_check_wdev(enum nl80211_iftype iftype, |
1219 | struct wireless_dev *wdev, |
1220 | struct ieee80211_channel *chan) |
1221 | { |
1222 | struct ieee80211_channel *other_chan = NULL; |
1223 | unsigned int link_id; |
1224 | int r1, r2; |
1225 | |
1226 | for_each_valid_link(wdev, link_id) { |
1227 | if (wdev->iftype == NL80211_IFTYPE_STATION && |
1228 | wdev->links[link_id].client.current_bss) |
1229 | other_chan = wdev->links[link_id].client.current_bss->pub.channel; |
1230 | |
1231 | /* |
1232 | * If a GO already operates on the same GO_CONCURRENT channel, |
1233 | * this one (maybe the same one) can beacon as well. We allow |
1234 | * the operation even if the station we relied on with |
1235 | * GO_CONCURRENT is disconnected now. But then we must make sure |
1236 | * we're not outdoor on an indoor-only channel. |
1237 | */ |
1238 | if (iftype == NL80211_IFTYPE_P2P_GO && |
1239 | wdev->iftype == NL80211_IFTYPE_P2P_GO && |
1240 | wdev->links[link_id].ap.beacon_interval && |
1241 | !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) |
1242 | other_chan = wdev->links[link_id].ap.chandef.chan; |
1243 | |
1244 | if (!other_chan) |
1245 | continue; |
1246 | |
1247 | if (chan == other_chan) |
1248 | return true; |
1249 | |
1250 | if (chan->band != NL80211_BAND_5GHZ && |
1251 | chan->band != NL80211_BAND_6GHZ) |
1252 | continue; |
1253 | |
1254 | r1 = cfg80211_get_unii(freq: chan->center_freq); |
1255 | r2 = cfg80211_get_unii(freq: other_chan->center_freq); |
1256 | |
1257 | if (r1 != -EINVAL && r1 == r2) { |
1258 | /* |
1259 | * At some locations channels 149-165 are considered a |
1260 | * bundle, but at other locations, e.g., Indonesia, |
1261 | * channels 149-161 are considered a bundle while |
1262 | * channel 165 is left out and considered to be in a |
1263 | * different bundle. Thus, in case that there is a |
1264 | * station interface connected to an AP on channel 165, |
1265 | * it is assumed that channels 149-161 are allowed for |
1266 | * GO operations. However, having a station interface |
1267 | * connected to an AP on channels 149-161, does not |
1268 | * allow GO operation on channel 165. |
1269 | */ |
1270 | if (chan->center_freq == 5825 && |
1271 | other_chan->center_freq != 5825) |
1272 | continue; |
1273 | return true; |
1274 | } |
1275 | } |
1276 | |
1277 | return false; |
1278 | } |
1279 | |
1280 | /* |
1281 | * Check if the channel can be used under permissive conditions mandated by |
1282 | * some regulatory bodies, i.e., the channel is marked with |
1283 | * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface |
1284 | * associated to an AP on the same channel or on the same UNII band |
1285 | * (assuming that the AP is an authorized master). |
1286 | * In addition allow operation on a channel on which indoor operation is |
1287 | * allowed, iff we are currently operating in an indoor environment. |
1288 | */ |
1289 | static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, |
1290 | enum nl80211_iftype iftype, |
1291 | struct ieee80211_channel *chan) |
1292 | { |
1293 | struct wireless_dev *wdev; |
1294 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
1295 | |
1296 | lockdep_assert_held(&rdev->wiphy.mtx); |
1297 | |
1298 | if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || |
1299 | !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) |
1300 | return false; |
1301 | |
1302 | /* only valid for GO and TDLS off-channel (station/p2p-CL) */ |
1303 | if (iftype != NL80211_IFTYPE_P2P_GO && |
1304 | iftype != NL80211_IFTYPE_STATION && |
1305 | iftype != NL80211_IFTYPE_P2P_CLIENT) |
1306 | return false; |
1307 | |
1308 | if (regulatory_indoor_allowed() && |
1309 | (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) |
1310 | return true; |
1311 | |
1312 | if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) |
1313 | return false; |
1314 | |
1315 | /* |
1316 | * Generally, it is possible to rely on another device/driver to allow |
1317 | * the IR concurrent relaxation, however, since the device can further |
1318 | * enforce the relaxation (by doing a similar verifications as this), |
1319 | * and thus fail the GO instantiation, consider only the interfaces of |
1320 | * the current registered device. |
1321 | */ |
1322 | list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { |
1323 | bool ret; |
1324 | |
1325 | ret = cfg80211_ir_permissive_check_wdev(iftype, wdev, chan); |
1326 | if (ret) |
1327 | return ret; |
1328 | } |
1329 | |
1330 | return false; |
1331 | } |
1332 | |
1333 | static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, |
1334 | struct cfg80211_chan_def *chandef, |
1335 | enum nl80211_iftype iftype, |
1336 | bool check_no_ir) |
1337 | { |
1338 | bool res; |
1339 | u32 prohibited_flags = IEEE80211_CHAN_DISABLED | |
1340 | IEEE80211_CHAN_RADAR; |
1341 | |
1342 | trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); |
1343 | |
1344 | if (check_no_ir) |
1345 | prohibited_flags |= IEEE80211_CHAN_NO_IR; |
1346 | |
1347 | if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && |
1348 | cfg80211_chandef_dfs_available(wiphy, chandef)) { |
1349 | /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ |
1350 | prohibited_flags = IEEE80211_CHAN_DISABLED; |
1351 | } |
1352 | |
1353 | res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); |
1354 | |
1355 | trace_cfg80211_return_bool(ret: res); |
1356 | return res; |
1357 | } |
1358 | |
1359 | bool cfg80211_reg_can_beacon(struct wiphy *wiphy, |
1360 | struct cfg80211_chan_def *chandef, |
1361 | enum nl80211_iftype iftype) |
1362 | { |
1363 | return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir: true); |
1364 | } |
1365 | EXPORT_SYMBOL(cfg80211_reg_can_beacon); |
1366 | |
1367 | bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, |
1368 | struct cfg80211_chan_def *chandef, |
1369 | enum nl80211_iftype iftype) |
1370 | { |
1371 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
1372 | bool check_no_ir; |
1373 | |
1374 | lockdep_assert_held(&rdev->wiphy.mtx); |
1375 | |
1376 | /* |
1377 | * Under certain conditions suggested by some regulatory bodies a |
1378 | * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag |
1379 | * only if such relaxations are not enabled and the conditions are not |
1380 | * met. |
1381 | */ |
1382 | check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, |
1383 | chan: chandef->chan); |
1384 | |
1385 | return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); |
1386 | } |
1387 | EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); |
1388 | |
1389 | int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, |
1390 | struct cfg80211_chan_def *chandef) |
1391 | { |
1392 | if (!rdev->ops->set_monitor_channel) |
1393 | return -EOPNOTSUPP; |
1394 | if (!cfg80211_has_monitors_only(rdev)) |
1395 | return -EBUSY; |
1396 | |
1397 | return rdev_set_monitor_channel(rdev, chandef); |
1398 | } |
1399 | |
1400 | bool cfg80211_any_usable_channels(struct wiphy *wiphy, |
1401 | unsigned long sband_mask, |
1402 | u32 prohibited_flags) |
1403 | { |
1404 | int idx; |
1405 | |
1406 | prohibited_flags |= IEEE80211_CHAN_DISABLED; |
1407 | |
1408 | for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) { |
1409 | struct ieee80211_supported_band *sband = wiphy->bands[idx]; |
1410 | int chanidx; |
1411 | |
1412 | if (!sband) |
1413 | continue; |
1414 | |
1415 | for (chanidx = 0; chanidx < sband->n_channels; chanidx++) { |
1416 | struct ieee80211_channel *chan; |
1417 | |
1418 | chan = &sband->channels[chanidx]; |
1419 | |
1420 | if (chan->flags & prohibited_flags) |
1421 | continue; |
1422 | |
1423 | return true; |
1424 | } |
1425 | } |
1426 | |
1427 | return false; |
1428 | } |
1429 | EXPORT_SYMBOL(cfg80211_any_usable_channels); |
1430 | |
1431 | struct cfg80211_chan_def *wdev_chandef(struct wireless_dev *wdev, |
1432 | unsigned int link_id) |
1433 | { |
1434 | lockdep_assert_wiphy(wdev->wiphy); |
1435 | |
1436 | WARN_ON(wdev->valid_links && !(wdev->valid_links & BIT(link_id))); |
1437 | WARN_ON(!wdev->valid_links && link_id > 0); |
1438 | |
1439 | switch (wdev->iftype) { |
1440 | case NL80211_IFTYPE_MESH_POINT: |
1441 | return &wdev->u.mesh.chandef; |
1442 | case NL80211_IFTYPE_ADHOC: |
1443 | return &wdev->u.ibss.chandef; |
1444 | case NL80211_IFTYPE_OCB: |
1445 | return &wdev->u.ocb.chandef; |
1446 | case NL80211_IFTYPE_AP: |
1447 | case NL80211_IFTYPE_P2P_GO: |
1448 | return &wdev->links[link_id].ap.chandef; |
1449 | default: |
1450 | return NULL; |
1451 | } |
1452 | } |
1453 | EXPORT_SYMBOL(wdev_chandef); |
1454 | |
1455 | struct cfg80211_per_bw_puncturing_values { |
1456 | u8 len; |
1457 | const u16 *valid_values; |
1458 | }; |
1459 | |
1460 | static const u16 puncturing_values_80mhz[] = { |
1461 | 0x8, 0x4, 0x2, 0x1 |
1462 | }; |
1463 | |
1464 | static const u16 puncturing_values_160mhz[] = { |
1465 | 0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1, 0xc0, 0x30, 0xc, 0x3 |
1466 | }; |
1467 | |
1468 | static const u16 puncturing_values_320mhz[] = { |
1469 | 0xc000, 0x3000, 0xc00, 0x300, 0xc0, 0x30, 0xc, 0x3, 0xf000, 0xf00, |
1470 | 0xf0, 0xf, 0xfc00, 0xf300, 0xf0c0, 0xf030, 0xf00c, 0xf003, 0xc00f, |
1471 | 0x300f, 0xc0f, 0x30f, 0xcf, 0x3f |
1472 | }; |
1473 | |
1474 | #define CFG80211_PER_BW_VALID_PUNCTURING_VALUES(_bw) \ |
1475 | { \ |
1476 | .len = ARRAY_SIZE(puncturing_values_ ## _bw ## mhz), \ |
1477 | .valid_values = puncturing_values_ ## _bw ## mhz \ |
1478 | } |
1479 | |
1480 | static const struct cfg80211_per_bw_puncturing_values per_bw_puncturing[] = { |
1481 | CFG80211_PER_BW_VALID_PUNCTURING_VALUES(80), |
1482 | CFG80211_PER_BW_VALID_PUNCTURING_VALUES(160), |
1483 | CFG80211_PER_BW_VALID_PUNCTURING_VALUES(320) |
1484 | }; |
1485 | |
1486 | bool cfg80211_valid_disable_subchannel_bitmap(u16 *bitmap, |
1487 | const struct cfg80211_chan_def *chandef) |
1488 | { |
1489 | u32 idx, i, start_freq; |
1490 | |
1491 | switch (chandef->width) { |
1492 | case NL80211_CHAN_WIDTH_80: |
1493 | idx = 0; |
1494 | start_freq = chandef->center_freq1 - 40; |
1495 | break; |
1496 | case NL80211_CHAN_WIDTH_160: |
1497 | idx = 1; |
1498 | start_freq = chandef->center_freq1 - 80; |
1499 | break; |
1500 | case NL80211_CHAN_WIDTH_320: |
1501 | idx = 2; |
1502 | start_freq = chandef->center_freq1 - 160; |
1503 | break; |
1504 | default: |
1505 | *bitmap = 0; |
1506 | break; |
1507 | } |
1508 | |
1509 | if (!*bitmap) |
1510 | return true; |
1511 | |
1512 | /* check if primary channel is punctured */ |
1513 | if (*bitmap & (u16)BIT((chandef->chan->center_freq - start_freq) / 20)) |
1514 | return false; |
1515 | |
1516 | for (i = 0; i < per_bw_puncturing[idx].len; i++) |
1517 | if (per_bw_puncturing[idx].valid_values[i] == *bitmap) |
1518 | return true; |
1519 | |
1520 | return false; |
1521 | } |
1522 | EXPORT_SYMBOL(cfg80211_valid_disable_subchannel_bitmap); |
1523 | |