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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 2018-2020 Intel Corporation | |
10 | */ | |
11 | ||
12 | #include <linux/export.h> | |
13 | #include <net/cfg80211.h> | |
14 | #include "core.h" | |
15 | #include "rdev-ops.h" | |
16 | ||
17 | static bool cfg80211_valid_60g_freq(u32 freq) | |
18 | { | |
19 | return freq >= 58320 && freq <= 70200; | |
20 | } | |
21 | ||
22 | void cfg80211_chandef_create(struct cfg80211_chan_def *chandef, | |
23 | struct ieee80211_channel *chan, | |
24 | enum nl80211_channel_type chan_type) | |
25 | { | |
26 | if (WARN_ON(!chan)) | |
27 | return; | |
28 | ||
29 | chandef->chan = chan; | |
30 | chandef->freq1_offset = chan->freq_offset; | |
31 | chandef->center_freq2 = 0; | |
32 | chandef->edmg.bw_config = 0; | |
33 | chandef->edmg.channels = 0; | |
34 | ||
35 | switch (chan_type) { | |
36 | case NL80211_CHAN_NO_HT: | |
37 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
38 | chandef->center_freq1 = chan->center_freq; | |
39 | break; | |
40 | case NL80211_CHAN_HT20: | |
41 | chandef->width = NL80211_CHAN_WIDTH_20; | |
42 | chandef->center_freq1 = chan->center_freq; | |
43 | break; | |
44 | case NL80211_CHAN_HT40PLUS: | |
45 | chandef->width = NL80211_CHAN_WIDTH_40; | |
46 | chandef->center_freq1 = chan->center_freq + 10; | |
47 | break; | |
48 | case NL80211_CHAN_HT40MINUS: | |
49 | chandef->width = NL80211_CHAN_WIDTH_40; | |
50 | chandef->center_freq1 = chan->center_freq - 10; | |
51 | break; | |
52 | default: | |
53 | WARN_ON(1); | |
54 | } | |
55 | } | |
56 | EXPORT_SYMBOL(cfg80211_chandef_create); | |
57 | ||
58 | static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef) | |
59 | { | |
60 | int max_contiguous = 0; | |
61 | int num_of_enabled = 0; | |
62 | int contiguous = 0; | |
63 | int i; | |
64 | ||
65 | if (!chandef->edmg.channels || !chandef->edmg.bw_config) | |
66 | return false; | |
67 | ||
68 | if (!cfg80211_valid_60g_freq(chandef->chan->center_freq)) | |
69 | return false; | |
70 | ||
71 | for (i = 0; i < 6; i++) { | |
72 | if (chandef->edmg.channels & BIT(i)) { | |
73 | contiguous++; | |
74 | num_of_enabled++; | |
75 | } else { | |
76 | contiguous = 0; | |
77 | } | |
78 | ||
79 | max_contiguous = max(contiguous, max_contiguous); | |
80 | } | |
81 | /* basic verification of edmg configuration according to | |
82 | * IEEE P802.11ay/D4.0 section 9.4.2.251 | |
83 | */ | |
84 | /* check bw_config against contiguous edmg channels */ | |
85 | switch (chandef->edmg.bw_config) { | |
86 | case IEEE80211_EDMG_BW_CONFIG_4: | |
87 | case IEEE80211_EDMG_BW_CONFIG_8: | |
88 | case IEEE80211_EDMG_BW_CONFIG_12: | |
89 | if (max_contiguous < 1) | |
90 | return false; | |
91 | break; | |
92 | case IEEE80211_EDMG_BW_CONFIG_5: | |
93 | case IEEE80211_EDMG_BW_CONFIG_9: | |
94 | case IEEE80211_EDMG_BW_CONFIG_13: | |
95 | if (max_contiguous < 2) | |
96 | return false; | |
97 | break; | |
98 | case IEEE80211_EDMG_BW_CONFIG_6: | |
99 | case IEEE80211_EDMG_BW_CONFIG_10: | |
100 | case IEEE80211_EDMG_BW_CONFIG_14: | |
101 | if (max_contiguous < 3) | |
102 | return false; | |
103 | break; | |
104 | case IEEE80211_EDMG_BW_CONFIG_7: | |
105 | case IEEE80211_EDMG_BW_CONFIG_11: | |
106 | case IEEE80211_EDMG_BW_CONFIG_15: | |
107 | if (max_contiguous < 4) | |
108 | return false; | |
109 | break; | |
110 | ||
111 | default: | |
112 | return false; | |
113 | } | |
114 | ||
115 | /* check bw_config against aggregated (non contiguous) edmg channels */ | |
116 | switch (chandef->edmg.bw_config) { | |
117 | case IEEE80211_EDMG_BW_CONFIG_4: | |
118 | case IEEE80211_EDMG_BW_CONFIG_5: | |
119 | case IEEE80211_EDMG_BW_CONFIG_6: | |
120 | case IEEE80211_EDMG_BW_CONFIG_7: | |
121 | break; | |
122 | case IEEE80211_EDMG_BW_CONFIG_8: | |
123 | case IEEE80211_EDMG_BW_CONFIG_9: | |
124 | case IEEE80211_EDMG_BW_CONFIG_10: | |
125 | case IEEE80211_EDMG_BW_CONFIG_11: | |
126 | if (num_of_enabled < 2) | |
127 | return false; | |
128 | break; | |
129 | case IEEE80211_EDMG_BW_CONFIG_12: | |
130 | case IEEE80211_EDMG_BW_CONFIG_13: | |
131 | case IEEE80211_EDMG_BW_CONFIG_14: | |
132 | case IEEE80211_EDMG_BW_CONFIG_15: | |
133 | if (num_of_enabled < 4 || max_contiguous < 2) | |
134 | return false; | |
135 | break; | |
136 | default: | |
137 | return false; | |
138 | } | |
139 | ||
140 | return true; | |
141 | } | |
142 | ||
143 | bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) | |
144 | { | |
145 | u32 control_freq; | |
146 | ||
147 | if (!chandef->chan) | |
148 | return false; | |
149 | ||
150 | if (chandef->freq1_offset >= 1000) | |
151 | return false; | |
152 | ||
153 | control_freq = chandef->chan->center_freq; | |
154 | ||
155 | switch (chandef->width) { | |
156 | case NL80211_CHAN_WIDTH_1: | |
157 | case NL80211_CHAN_WIDTH_2: | |
158 | case NL80211_CHAN_WIDTH_4: | |
159 | case NL80211_CHAN_WIDTH_8: | |
160 | case NL80211_CHAN_WIDTH_16: | |
161 | case NL80211_CHAN_WIDTH_5: | |
162 | case NL80211_CHAN_WIDTH_10: | |
163 | case NL80211_CHAN_WIDTH_20: | |
164 | case NL80211_CHAN_WIDTH_20_NOHT: | |
165 | if (ieee80211_chandef_to_khz(chandef) != | |
166 | ieee80211_channel_to_khz(chandef->chan)) | |
167 | return false; | |
168 | if (chandef->center_freq2) | |
169 | return false; | |
170 | break; | |
171 | case NL80211_CHAN_WIDTH_40: | |
172 | if (chandef->center_freq1 != control_freq + 10 && | |
173 | chandef->center_freq1 != control_freq - 10) | |
174 | return false; | |
175 | if (chandef->center_freq2) | |
176 | return false; | |
177 | break; | |
178 | case NL80211_CHAN_WIDTH_80P80: | |
179 | if (chandef->center_freq1 != control_freq + 30 && | |
180 | chandef->center_freq1 != control_freq + 10 && | |
181 | chandef->center_freq1 != control_freq - 10 && | |
182 | chandef->center_freq1 != control_freq - 30) | |
183 | return false; | |
184 | if (!chandef->center_freq2) | |
185 | return false; | |
186 | /* adjacent is not allowed -- that's a 160 MHz channel */ | |
187 | if (chandef->center_freq1 - chandef->center_freq2 == 80 || | |
188 | chandef->center_freq2 - chandef->center_freq1 == 80) | |
189 | return false; | |
190 | break; | |
191 | case NL80211_CHAN_WIDTH_80: | |
192 | if (chandef->center_freq1 != control_freq + 30 && | |
193 | chandef->center_freq1 != control_freq + 10 && | |
194 | chandef->center_freq1 != control_freq - 10 && | |
195 | chandef->center_freq1 != control_freq - 30) | |
196 | return false; | |
197 | if (chandef->center_freq2) | |
198 | return false; | |
199 | break; | |
200 | case NL80211_CHAN_WIDTH_160: | |
201 | if (chandef->center_freq1 != control_freq + 70 && | |
202 | chandef->center_freq1 != control_freq + 50 && | |
203 | chandef->center_freq1 != control_freq + 30 && | |
204 | chandef->center_freq1 != control_freq + 10 && | |
205 | chandef->center_freq1 != control_freq - 10 && | |
206 | chandef->center_freq1 != control_freq - 30 && | |
207 | chandef->center_freq1 != control_freq - 50 && | |
208 | chandef->center_freq1 != control_freq - 70) | |
209 | return false; | |
210 | if (chandef->center_freq2) | |
211 | return false; | |
212 | break; | |
213 | default: | |
214 | return false; | |
215 | } | |
216 | ||
217 | /* channel 14 is only for IEEE 802.11b */ | |
218 | if (chandef->center_freq1 == 2484 && | |
219 | chandef->width != NL80211_CHAN_WIDTH_20_NOHT) | |
220 | return false; | |
221 | ||
222 | if (cfg80211_chandef_is_edmg(chandef) && | |
223 | !cfg80211_edmg_chandef_valid(chandef)) | |
224 | return false; | |
225 | ||
226 | return true; | |
227 | } | |
228 | EXPORT_SYMBOL(cfg80211_chandef_valid); | |
229 | ||
230 | static void chandef_primary_freqs(const struct cfg80211_chan_def *c, | |
231 | u32 *pri40, u32 *pri80) | |
232 | { | |
233 | int tmp; | |
234 | ||
235 | switch (c->width) { | |
236 | case NL80211_CHAN_WIDTH_40: | |
237 | *pri40 = c->center_freq1; | |
238 | *pri80 = 0; | |
239 | break; | |
240 | case NL80211_CHAN_WIDTH_80: | |
241 | case NL80211_CHAN_WIDTH_80P80: | |
242 | *pri80 = c->center_freq1; | |
243 | /* n_P20 */ | |
244 | tmp = (30 + c->chan->center_freq - c->center_freq1)/20; | |
245 | /* n_P40 */ | |
246 | tmp /= 2; | |
247 | /* freq_P40 */ | |
248 | *pri40 = c->center_freq1 - 20 + 40 * tmp; | |
249 | break; | |
250 | case NL80211_CHAN_WIDTH_160: | |
251 | /* n_P20 */ | |
252 | tmp = (70 + c->chan->center_freq - c->center_freq1)/20; | |
253 | /* n_P40 */ | |
254 | tmp /= 2; | |
255 | /* freq_P40 */ | |
256 | *pri40 = c->center_freq1 - 60 + 40 * tmp; | |
257 | /* n_P80 */ | |
258 | tmp /= 2; | |
259 | *pri80 = c->center_freq1 - 40 + 80 * tmp; | |
260 | break; | |
261 | default: | |
262 | WARN_ON_ONCE(1); | |
263 | } | |
264 | } | |
265 | ||
266 | static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) | |
267 | { | |
268 | int width; | |
269 | ||
270 | switch (c->width) { | |
271 | case NL80211_CHAN_WIDTH_1: | |
272 | width = 1; | |
273 | break; | |
274 | case NL80211_CHAN_WIDTH_2: | |
275 | width = 2; | |
276 | break; | |
277 | case NL80211_CHAN_WIDTH_4: | |
278 | width = 4; | |
279 | break; | |
280 | case NL80211_CHAN_WIDTH_8: | |
281 | width = 8; | |
282 | break; | |
283 | case NL80211_CHAN_WIDTH_16: | |
284 | width = 16; | |
285 | break; | |
286 | case NL80211_CHAN_WIDTH_5: | |
287 | width = 5; | |
288 | break; | |
289 | case NL80211_CHAN_WIDTH_10: | |
290 | width = 10; | |
291 | break; | |
292 | case NL80211_CHAN_WIDTH_20: | |
293 | case NL80211_CHAN_WIDTH_20_NOHT: | |
294 | width = 20; | |
295 | break; | |
296 | case NL80211_CHAN_WIDTH_40: | |
297 | width = 40; | |
298 | break; | |
299 | case NL80211_CHAN_WIDTH_80P80: | |
300 | case NL80211_CHAN_WIDTH_80: | |
301 | width = 80; | |
302 | break; | |
303 | case NL80211_CHAN_WIDTH_160: | |
304 | width = 160; | |
305 | break; | |
306 | default: | |
307 | WARN_ON_ONCE(1); | |
308 | return -1; | |
309 | } | |
310 | return width; | |
311 | } | |
312 | ||
313 | const struct cfg80211_chan_def * | |
314 | cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, | |
315 | const struct cfg80211_chan_def *c2) | |
316 | { | |
317 | u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80; | |
318 | ||
319 | /* If they are identical, return */ | |
320 | if (cfg80211_chandef_identical(c1, c2)) | |
321 | return c1; | |
322 | ||
323 | /* otherwise, must have same control channel */ | |
324 | if (c1->chan != c2->chan) | |
325 | return NULL; | |
326 | ||
327 | /* | |
328 | * If they have the same width, but aren't identical, | |
329 | * then they can't be compatible. | |
330 | */ | |
331 | if (c1->width == c2->width) | |
332 | return NULL; | |
333 | ||
334 | /* | |
335 | * can't be compatible if one of them is 5 or 10 MHz, | |
336 | * but they don't have the same width. | |
337 | */ | |
338 | if (c1->width == NL80211_CHAN_WIDTH_5 || | |
339 | c1->width == NL80211_CHAN_WIDTH_10 || | |
340 | c2->width == NL80211_CHAN_WIDTH_5 || | |
341 | c2->width == NL80211_CHAN_WIDTH_10) | |
342 | return NULL; | |
343 | ||
344 | if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || | |
345 | c1->width == NL80211_CHAN_WIDTH_20) | |
346 | return c2; | |
347 | ||
348 | if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || | |
349 | c2->width == NL80211_CHAN_WIDTH_20) | |
350 | return c1; | |
351 | ||
352 | chandef_primary_freqs(c1, &c1_pri40, &c1_pri80); | |
353 | chandef_primary_freqs(c2, &c2_pri40, &c2_pri80); | |
354 | ||
355 | if (c1_pri40 != c2_pri40) | |
356 | return NULL; | |
357 | ||
358 | WARN_ON(!c1_pri80 && !c2_pri80); | |
359 | if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80) | |
360 | return NULL; | |
361 | ||
362 | if (c1->width > c2->width) | |
363 | return c1; | |
364 | return c2; | |
365 | } | |
366 | EXPORT_SYMBOL(cfg80211_chandef_compatible); | |
367 | ||
368 | static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, | |
369 | u32 bandwidth, | |
370 | enum nl80211_dfs_state dfs_state) | |
371 | { | |
372 | struct ieee80211_channel *c; | |
373 | u32 freq; | |
374 | ||
375 | for (freq = center_freq - bandwidth/2 + 10; | |
376 | freq <= center_freq + bandwidth/2 - 10; | |
377 | freq += 20) { | |
378 | c = ieee80211_get_channel(wiphy, freq); | |
379 | if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) | |
380 | continue; | |
381 | ||
382 | c->dfs_state = dfs_state; | |
383 | c->dfs_state_entered = jiffies; | |
384 | } | |
385 | } | |
386 | ||
387 | void cfg80211_set_dfs_state(struct wiphy *wiphy, | |
388 | const struct cfg80211_chan_def *chandef, | |
389 | enum nl80211_dfs_state dfs_state) | |
390 | { | |
391 | int width; | |
392 | ||
393 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
394 | return; | |
395 | ||
396 | width = cfg80211_chandef_get_width(chandef); | |
397 | if (width < 0) | |
398 | return; | |
399 | ||
400 | cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1, | |
401 | width, dfs_state); | |
402 | ||
403 | if (!chandef->center_freq2) | |
404 | return; | |
405 | cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2, | |
406 | width, dfs_state); | |
407 | } | |
408 | ||
409 | static u32 cfg80211_get_start_freq(u32 center_freq, | |
410 | u32 bandwidth) | |
411 | { | |
412 | u32 start_freq; | |
413 | ||
414 | bandwidth = MHZ_TO_KHZ(bandwidth); | |
415 | if (bandwidth <= MHZ_TO_KHZ(20)) | |
416 | start_freq = center_freq; | |
417 | else | |
418 | start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10); | |
419 | ||
420 | return start_freq; | |
421 | } | |
422 | ||
423 | static u32 cfg80211_get_end_freq(u32 center_freq, | |
424 | u32 bandwidth) | |
425 | { | |
426 | u32 end_freq; | |
427 | ||
428 | bandwidth = MHZ_TO_KHZ(bandwidth); | |
429 | if (bandwidth <= MHZ_TO_KHZ(20)) | |
430 | end_freq = center_freq; | |
431 | else | |
432 | end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10); | |
433 | ||
434 | return end_freq; | |
435 | } | |
436 | ||
437 | static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, | |
438 | u32 center_freq, | |
439 | u32 bandwidth) | |
440 | { | |
441 | struct ieee80211_channel *c; | |
442 | u32 freq, start_freq, end_freq; | |
443 | ||
444 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); | |
445 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
446 | ||
447 | for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { | |
448 | c = ieee80211_get_channel_khz(wiphy, freq); | |
449 | if (!c) | |
450 | return -EINVAL; | |
451 | ||
452 | if (c->flags & IEEE80211_CHAN_RADAR) | |
453 | return 1; | |
454 | } | |
455 | return 0; | |
456 | } | |
457 | ||
458 | ||
459 | int cfg80211_chandef_dfs_required(struct wiphy *wiphy, | |
460 | const struct cfg80211_chan_def *chandef, | |
461 | enum nl80211_iftype iftype) | |
462 | { | |
463 | int width; | |
464 | int ret; | |
465 | ||
466 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
467 | return -EINVAL; | |
468 | ||
469 | switch (iftype) { | |
470 | case NL80211_IFTYPE_ADHOC: | |
471 | case NL80211_IFTYPE_AP: | |
472 | case NL80211_IFTYPE_P2P_GO: | |
473 | case NL80211_IFTYPE_MESH_POINT: | |
474 | width = cfg80211_chandef_get_width(chandef); | |
475 | if (width < 0) | |
476 | return -EINVAL; | |
477 | ||
478 | ret = cfg80211_get_chans_dfs_required(wiphy, | |
479 | ieee80211_chandef_to_khz(chandef), | |
480 | width); | |
481 | if (ret < 0) | |
482 | return ret; | |
483 | else if (ret > 0) | |
484 | return BIT(chandef->width); | |
485 | ||
486 | if (!chandef->center_freq2) | |
487 | return 0; | |
488 | ||
489 | ret = cfg80211_get_chans_dfs_required(wiphy, | |
490 | MHZ_TO_KHZ(chandef->center_freq2), | |
491 | width); | |
492 | if (ret < 0) | |
493 | return ret; | |
494 | else if (ret > 0) | |
495 | return BIT(chandef->width); | |
496 | ||
497 | break; | |
498 | case NL80211_IFTYPE_STATION: | |
499 | case NL80211_IFTYPE_OCB: | |
500 | case NL80211_IFTYPE_P2P_CLIENT: | |
501 | case NL80211_IFTYPE_MONITOR: | |
502 | case NL80211_IFTYPE_AP_VLAN: | |
503 | case NL80211_IFTYPE_WDS: | |
504 | case NL80211_IFTYPE_P2P_DEVICE: | |
505 | case NL80211_IFTYPE_NAN: | |
506 | break; | |
507 | case NL80211_IFTYPE_UNSPECIFIED: | |
508 | case NUM_NL80211_IFTYPES: | |
509 | WARN_ON(1); | |
510 | } | |
511 | ||
512 | return 0; | |
513 | } | |
514 | EXPORT_SYMBOL(cfg80211_chandef_dfs_required); | |
515 | ||
516 | static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, | |
517 | u32 center_freq, | |
518 | u32 bandwidth) | |
519 | { | |
520 | struct ieee80211_channel *c; | |
521 | u32 freq, start_freq, end_freq; | |
522 | int count = 0; | |
523 | ||
524 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); | |
525 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
526 | ||
527 | /* | |
528 | * Check entire range of channels for the bandwidth. | |
529 | * Check all channels are DFS channels (DFS_USABLE or | |
530 | * DFS_AVAILABLE). Return number of usable channels | |
531 | * (require CAC). Allow DFS and non-DFS channel mix. | |
532 | */ | |
533 | for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { | |
534 | c = ieee80211_get_channel_khz(wiphy, freq); | |
535 | if (!c) | |
536 | return -EINVAL; | |
537 | ||
538 | if (c->flags & IEEE80211_CHAN_DISABLED) | |
539 | return -EINVAL; | |
540 | ||
541 | if (c->flags & IEEE80211_CHAN_RADAR) { | |
542 | if (c->dfs_state == NL80211_DFS_UNAVAILABLE) | |
543 | return -EINVAL; | |
544 | ||
545 | if (c->dfs_state == NL80211_DFS_USABLE) | |
546 | count++; | |
547 | } | |
548 | } | |
549 | ||
550 | return count; | |
551 | } | |
552 | ||
553 | bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, | |
554 | const struct cfg80211_chan_def *chandef) | |
555 | { | |
556 | int width; | |
557 | int r1, r2 = 0; | |
558 | ||
559 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
560 | return false; | |
561 | ||
562 | width = cfg80211_chandef_get_width(chandef); | |
563 | if (width < 0) | |
564 | return false; | |
565 | ||
566 | r1 = cfg80211_get_chans_dfs_usable(wiphy, | |
567 | MHZ_TO_KHZ(chandef->center_freq1), | |
568 | width); | |
569 | ||
570 | if (r1 < 0) | |
571 | return false; | |
572 | ||
573 | switch (chandef->width) { | |
574 | case NL80211_CHAN_WIDTH_80P80: | |
575 | WARN_ON(!chandef->center_freq2); | |
576 | r2 = cfg80211_get_chans_dfs_usable(wiphy, | |
577 | MHZ_TO_KHZ(chandef->center_freq2), | |
578 | width); | |
579 | if (r2 < 0) | |
580 | return false; | |
581 | break; | |
582 | default: | |
583 | WARN_ON(chandef->center_freq2); | |
584 | break; | |
585 | } | |
586 | ||
587 | return (r1 + r2 > 0); | |
588 | } | |
589 | ||
590 | /* | |
591 | * Checks if center frequency of chan falls with in the bandwidth | |
592 | * range of chandef. | |
593 | */ | |
594 | bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef, | |
595 | struct ieee80211_channel *chan) | |
596 | { | |
597 | int width; | |
598 | u32 freq; | |
599 | ||
600 | if (chandef->chan->center_freq == chan->center_freq) | |
601 | return true; | |
602 | ||
603 | width = cfg80211_chandef_get_width(chandef); | |
604 | if (width <= 20) | |
605 | return false; | |
606 | ||
607 | for (freq = chandef->center_freq1 - width / 2 + 10; | |
608 | freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) { | |
609 | if (chan->center_freq == freq) | |
610 | return true; | |
611 | } | |
612 | ||
613 | if (!chandef->center_freq2) | |
614 | return false; | |
615 | ||
616 | for (freq = chandef->center_freq2 - width / 2 + 10; | |
617 | freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) { | |
618 | if (chan->center_freq == freq) | |
619 | return true; | |
620 | } | |
621 | ||
622 | return false; | |
623 | } | |
624 | ||
625 | bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) | |
626 | { | |
627 | bool active = false; | |
628 | ||
629 | ASSERT_WDEV_LOCK(wdev); | |
630 | ||
631 | if (!wdev->chandef.chan) | |
632 | return false; | |
633 | ||
634 | switch (wdev->iftype) { | |
635 | case NL80211_IFTYPE_AP: | |
636 | case NL80211_IFTYPE_P2P_GO: | |
637 | active = wdev->beacon_interval != 0; | |
638 | break; | |
639 | case NL80211_IFTYPE_ADHOC: | |
640 | active = wdev->ssid_len != 0; | |
641 | break; | |
642 | case NL80211_IFTYPE_MESH_POINT: | |
643 | active = wdev->mesh_id_len != 0; | |
644 | break; | |
645 | case NL80211_IFTYPE_STATION: | |
646 | case NL80211_IFTYPE_OCB: | |
647 | case NL80211_IFTYPE_P2P_CLIENT: | |
648 | case NL80211_IFTYPE_MONITOR: | |
649 | case NL80211_IFTYPE_AP_VLAN: | |
650 | case NL80211_IFTYPE_WDS: | |
651 | case NL80211_IFTYPE_P2P_DEVICE: | |
652 | /* Can NAN type be considered as beaconing interface? */ | |
653 | case NL80211_IFTYPE_NAN: | |
654 | break; | |
655 | case NL80211_IFTYPE_UNSPECIFIED: | |
656 | case NUM_NL80211_IFTYPES: | |
657 | WARN_ON(1); | |
658 | } | |
659 | ||
660 | return active; | |
661 | } | |
662 | ||
663 | static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy, | |
664 | struct ieee80211_channel *chan) | |
665 | { | |
666 | struct wireless_dev *wdev; | |
667 | ||
668 | list_for_each_entry(wdev, &wiphy->wdev_list, list) { | |
669 | wdev_lock(wdev); | |
670 | if (!cfg80211_beaconing_iface_active(wdev)) { | |
671 | wdev_unlock(wdev); | |
672 | continue; | |
673 | } | |
674 | ||
675 | if (cfg80211_is_sub_chan(&wdev->chandef, chan)) { | |
676 | wdev_unlock(wdev); | |
677 | return true; | |
678 | } | |
679 | wdev_unlock(wdev); | |
680 | } | |
681 | ||
682 | return false; | |
683 | } | |
684 | ||
685 | bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, | |
686 | struct ieee80211_channel *chan) | |
687 | { | |
688 | struct cfg80211_registered_device *rdev; | |
689 | ||
690 | ASSERT_RTNL(); | |
691 | ||
692 | if (!(chan->flags & IEEE80211_CHAN_RADAR)) | |
693 | return false; | |
694 | ||
695 | list_for_each_entry(rdev, &cfg80211_rdev_list, list) { | |
696 | if (!reg_dfs_domain_same(wiphy, &rdev->wiphy)) | |
697 | continue; | |
698 | ||
699 | if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan)) | |
700 | return true; | |
701 | } | |
702 | ||
703 | return false; | |
704 | } | |
705 | ||
706 | static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, | |
707 | u32 center_freq, | |
708 | u32 bandwidth) | |
709 | { | |
710 | struct ieee80211_channel *c; | |
711 | u32 freq, start_freq, end_freq; | |
712 | bool dfs_offload; | |
713 | ||
714 | dfs_offload = wiphy_ext_feature_isset(wiphy, | |
715 | NL80211_EXT_FEATURE_DFS_OFFLOAD); | |
716 | ||
717 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); | |
718 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
719 | ||
720 | /* | |
721 | * Check entire range of channels for the bandwidth. | |
722 | * If any channel in between is disabled or has not | |
723 | * had gone through CAC return false | |
724 | */ | |
725 | for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { | |
726 | c = ieee80211_get_channel_khz(wiphy, freq); | |
727 | if (!c) | |
728 | return false; | |
729 | ||
730 | if (c->flags & IEEE80211_CHAN_DISABLED) | |
731 | return false; | |
732 | ||
733 | if ((c->flags & IEEE80211_CHAN_RADAR) && | |
734 | (c->dfs_state != NL80211_DFS_AVAILABLE) && | |
735 | !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload)) | |
736 | return false; | |
737 | } | |
738 | ||
739 | return true; | |
740 | } | |
741 | ||
742 | static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, | |
743 | const struct cfg80211_chan_def *chandef) | |
744 | { | |
745 | int width; | |
746 | int r; | |
747 | ||
748 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
749 | return false; | |
750 | ||
751 | width = cfg80211_chandef_get_width(chandef); | |
752 | if (width < 0) | |
753 | return false; | |
754 | ||
755 | r = cfg80211_get_chans_dfs_available(wiphy, | |
756 | MHZ_TO_KHZ(chandef->center_freq1), | |
757 | width); | |
758 | ||
759 | /* If any of channels unavailable for cf1 just return */ | |
760 | if (!r) | |
761 | return r; | |
762 | ||
763 | switch (chandef->width) { | |
764 | case NL80211_CHAN_WIDTH_80P80: | |
765 | WARN_ON(!chandef->center_freq2); | |
766 | r = cfg80211_get_chans_dfs_available(wiphy, | |
767 | MHZ_TO_KHZ(chandef->center_freq2), | |
768 | width); | |
769 | break; | |
770 | default: | |
771 | WARN_ON(chandef->center_freq2); | |
772 | break; | |
773 | } | |
774 | ||
775 | return r; | |
776 | } | |
777 | ||
778 | static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, | |
779 | u32 center_freq, | |
780 | u32 bandwidth) | |
781 | { | |
782 | struct ieee80211_channel *c; | |
783 | u32 start_freq, end_freq, freq; | |
784 | unsigned int dfs_cac_ms = 0; | |
785 | ||
786 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); | |
787 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
788 | ||
789 | for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { | |
790 | c = ieee80211_get_channel_khz(wiphy, freq); | |
791 | if (!c) | |
792 | return 0; | |
793 | ||
794 | if (c->flags & IEEE80211_CHAN_DISABLED) | |
795 | return 0; | |
796 | ||
797 | if (!(c->flags & IEEE80211_CHAN_RADAR)) | |
798 | continue; | |
799 | ||
800 | if (c->dfs_cac_ms > dfs_cac_ms) | |
801 | dfs_cac_ms = c->dfs_cac_ms; | |
802 | } | |
803 | ||
804 | return dfs_cac_ms; | |
805 | } | |
806 | ||
807 | unsigned int | |
808 | cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, | |
809 | const struct cfg80211_chan_def *chandef) | |
810 | { | |
811 | int width; | |
812 | unsigned int t1 = 0, t2 = 0; | |
813 | ||
814 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
815 | return 0; | |
816 | ||
817 | width = cfg80211_chandef_get_width(chandef); | |
818 | if (width < 0) | |
819 | return 0; | |
820 | ||
821 | t1 = cfg80211_get_chans_dfs_cac_time(wiphy, | |
822 | MHZ_TO_KHZ(chandef->center_freq1), | |
823 | width); | |
824 | ||
825 | if (!chandef->center_freq2) | |
826 | return t1; | |
827 | ||
828 | t2 = cfg80211_get_chans_dfs_cac_time(wiphy, | |
829 | MHZ_TO_KHZ(chandef->center_freq2), | |
830 | width); | |
831 | ||
832 | return max(t1, t2); | |
833 | } | |
834 | ||
835 | static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, | |
836 | u32 center_freq, u32 bandwidth, | |
837 | u32 prohibited_flags) | |
838 | { | |
839 | struct ieee80211_channel *c; | |
840 | u32 freq, start_freq, end_freq; | |
841 | ||
842 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); | |
843 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
844 | ||
845 | for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { | |
846 | c = ieee80211_get_channel_khz(wiphy, freq); | |
847 | if (!c || c->flags & prohibited_flags) | |
848 | return false; | |
849 | } | |
850 | ||
851 | return true; | |
852 | } | |
853 | ||
854 | /* check if the operating channels are valid and supported */ | |
855 | static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels, | |
856 | enum ieee80211_edmg_bw_config edmg_bw_config, | |
857 | int primary_channel, | |
858 | struct ieee80211_edmg *edmg_cap) | |
859 | { | |
860 | struct ieee80211_channel *chan; | |
861 | int i, freq; | |
862 | int channels_counter = 0; | |
863 | ||
864 | if (!edmg_channels && !edmg_bw_config) | |
865 | return true; | |
866 | ||
867 | if ((!edmg_channels && edmg_bw_config) || | |
868 | (edmg_channels && !edmg_bw_config)) | |
869 | return false; | |
870 | ||
871 | if (!(edmg_channels & BIT(primary_channel - 1))) | |
872 | return false; | |
873 | ||
874 | /* 60GHz channels 1..6 */ | |
875 | for (i = 0; i < 6; i++) { | |
876 | if (!(edmg_channels & BIT(i))) | |
877 | continue; | |
878 | ||
879 | if (!(edmg_cap->channels & BIT(i))) | |
880 | return false; | |
881 | ||
882 | channels_counter++; | |
883 | ||
884 | freq = ieee80211_channel_to_frequency(i + 1, | |
885 | NL80211_BAND_60GHZ); | |
886 | chan = ieee80211_get_channel(wiphy, freq); | |
887 | if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) | |
888 | return false; | |
889 | } | |
890 | ||
891 | /* IEEE802.11 allows max 4 channels */ | |
892 | if (channels_counter > 4) | |
893 | return false; | |
894 | ||
895 | /* check bw_config is a subset of what driver supports | |
896 | * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13) | |
897 | */ | |
898 | if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4)) | |
899 | return false; | |
900 | ||
901 | if (edmg_bw_config > edmg_cap->bw_config) | |
902 | return false; | |
903 | ||
904 | return true; | |
905 | } | |
906 | ||
907 | bool cfg80211_chandef_usable(struct wiphy *wiphy, | |
908 | const struct cfg80211_chan_def *chandef, | |
909 | u32 prohibited_flags) | |
910 | { | |
911 | struct ieee80211_sta_ht_cap *ht_cap; | |
912 | struct ieee80211_sta_vht_cap *vht_cap; | |
913 | struct ieee80211_edmg *edmg_cap; | |
914 | u32 width, control_freq, cap; | |
915 | ||
916 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
917 | return false; | |
918 | ||
919 | ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; | |
920 | vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; | |
921 | edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap; | |
922 | ||
923 | if (edmg_cap->channels && | |
924 | !cfg80211_edmg_usable(wiphy, | |
925 | chandef->edmg.channels, | |
926 | chandef->edmg.bw_config, | |
927 | chandef->chan->hw_value, | |
928 | edmg_cap)) | |
929 | return false; | |
930 | ||
931 | control_freq = chandef->chan->center_freq; | |
932 | ||
933 | switch (chandef->width) { | |
934 | case NL80211_CHAN_WIDTH_1: | |
935 | width = 1; | |
936 | break; | |
937 | case NL80211_CHAN_WIDTH_2: | |
938 | width = 2; | |
939 | break; | |
940 | case NL80211_CHAN_WIDTH_4: | |
941 | width = 4; | |
942 | break; | |
943 | case NL80211_CHAN_WIDTH_8: | |
944 | width = 8; | |
945 | break; | |
946 | case NL80211_CHAN_WIDTH_16: | |
947 | width = 16; | |
948 | break; | |
949 | case NL80211_CHAN_WIDTH_5: | |
950 | width = 5; | |
951 | break; | |
952 | case NL80211_CHAN_WIDTH_10: | |
953 | prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; | |
954 | width = 10; | |
955 | break; | |
956 | case NL80211_CHAN_WIDTH_20: | |
957 | if (!ht_cap->ht_supported && | |
958 | chandef->chan->band != NL80211_BAND_6GHZ) | |
959 | return false; | |
960 | fallthrough; | |
961 | case NL80211_CHAN_WIDTH_20_NOHT: | |
962 | prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; | |
963 | width = 20; | |
964 | break; | |
965 | case NL80211_CHAN_WIDTH_40: | |
966 | width = 40; | |
967 | if (chandef->chan->band == NL80211_BAND_6GHZ) | |
968 | break; | |
969 | if (!ht_cap->ht_supported) | |
970 | return false; | |
971 | if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || | |
972 | ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) | |
973 | return false; | |
974 | if (chandef->center_freq1 < control_freq && | |
975 | chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) | |
976 | return false; | |
977 | if (chandef->center_freq1 > control_freq && | |
978 | chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) | |
979 | return false; | |
980 | break; | |
981 | case NL80211_CHAN_WIDTH_80P80: | |
982 | cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; | |
983 | if (chandef->chan->band != NL80211_BAND_6GHZ && | |
984 | cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) | |
985 | return false; | |
986 | fallthrough; | |
987 | case NL80211_CHAN_WIDTH_80: | |
988 | prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; | |
989 | width = 80; | |
990 | if (chandef->chan->band == NL80211_BAND_6GHZ) | |
991 | break; | |
992 | if (!vht_cap->vht_supported) | |
993 | return false; | |
994 | break; | |
995 | case NL80211_CHAN_WIDTH_160: | |
996 | prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; | |
997 | width = 160; | |
998 | if (chandef->chan->band == NL80211_BAND_6GHZ) | |
999 | break; | |
1000 | if (!vht_cap->vht_supported) | |
1001 | return false; | |
1002 | cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; | |
1003 | if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && | |
1004 | cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) | |
1005 | return false; | |
1006 | break; | |
1007 | default: | |
1008 | WARN_ON_ONCE(1); | |
1009 | return false; | |
1010 | } | |
1011 | ||
1012 | /* | |
1013 | * TODO: What if there are only certain 80/160/80+80 MHz channels | |
1014 | * allowed by the driver, or only certain combinations? | |
1015 | * For 40 MHz the driver can set the NO_HT40 flags, but for | |
1016 | * 80/160 MHz and in particular 80+80 MHz this isn't really | |
1017 | * feasible and we only have NO_80MHZ/NO_160MHZ so far but | |
1018 | * no way to cover 80+80 MHz or more complex restrictions. | |
1019 | * Note that such restrictions also need to be advertised to | |
1020 | * userspace, for example for P2P channel selection. | |
1021 | */ | |
1022 | ||
1023 | if (width > 20) | |
1024 | prohibited_flags |= IEEE80211_CHAN_NO_OFDM; | |
1025 | ||
1026 | /* 5 and 10 MHz are only defined for the OFDM PHY */ | |
1027 | if (width < 20) | |
1028 | prohibited_flags |= IEEE80211_CHAN_NO_OFDM; | |
1029 | ||
1030 | ||
1031 | if (!cfg80211_secondary_chans_ok(wiphy, | |
1032 | ieee80211_chandef_to_khz(chandef), | |
1033 | width, prohibited_flags)) | |
1034 | return false; | |
1035 | ||
1036 | if (!chandef->center_freq2) | |
1037 | return true; | |
1038 | return cfg80211_secondary_chans_ok(wiphy, | |
1039 | MHZ_TO_KHZ(chandef->center_freq2), | |
1040 | width, prohibited_flags); | |
1041 | } | |
1042 | EXPORT_SYMBOL(cfg80211_chandef_usable); | |
1043 | ||
1044 | /* | |
1045 | * Check if the channel can be used under permissive conditions mandated by | |
1046 | * some regulatory bodies, i.e., the channel is marked with | |
1047 | * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface | |
1048 | * associated to an AP on the same channel or on the same UNII band | |
1049 | * (assuming that the AP is an authorized master). | |
1050 | * In addition allow operation on a channel on which indoor operation is | |
1051 | * allowed, iff we are currently operating in an indoor environment. | |
1052 | */ | |
1053 | static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, | |
1054 | enum nl80211_iftype iftype, | |
1055 | struct ieee80211_channel *chan) | |
1056 | { | |
1057 | struct wireless_dev *wdev; | |
1058 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); | |
1059 | ||
1060 | ASSERT_RTNL(); | |
1061 | ||
1062 | if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || | |
1063 | !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) | |
1064 | return false; | |
1065 | ||
1066 | /* only valid for GO and TDLS off-channel (station/p2p-CL) */ | |
1067 | if (iftype != NL80211_IFTYPE_P2P_GO && | |
1068 | iftype != NL80211_IFTYPE_STATION && | |
1069 | iftype != NL80211_IFTYPE_P2P_CLIENT) | |
1070 | return false; | |
1071 | ||
1072 | if (regulatory_indoor_allowed() && | |
1073 | (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) | |
1074 | return true; | |
1075 | ||
1076 | if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) | |
1077 | return false; | |
1078 | ||
1079 | /* | |
1080 | * Generally, it is possible to rely on another device/driver to allow | |
1081 | * the IR concurrent relaxation, however, since the device can further | |
1082 | * enforce the relaxation (by doing a similar verifications as this), | |
1083 | * and thus fail the GO instantiation, consider only the interfaces of | |
1084 | * the current registered device. | |
1085 | */ | |
1086 | list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { | |
1087 | struct ieee80211_channel *other_chan = NULL; | |
1088 | int r1, r2; | |
1089 | ||
1090 | wdev_lock(wdev); | |
1091 | if (wdev->iftype == NL80211_IFTYPE_STATION && | |
1092 | wdev->current_bss) | |
1093 | other_chan = wdev->current_bss->pub.channel; | |
1094 | ||
1095 | /* | |
1096 | * If a GO already operates on the same GO_CONCURRENT channel, | |
1097 | * this one (maybe the same one) can beacon as well. We allow | |
1098 | * the operation even if the station we relied on with | |
1099 | * GO_CONCURRENT is disconnected now. But then we must make sure | |
1100 | * we're not outdoor on an indoor-only channel. | |
1101 | */ | |
1102 | if (iftype == NL80211_IFTYPE_P2P_GO && | |
1103 | wdev->iftype == NL80211_IFTYPE_P2P_GO && | |
1104 | wdev->beacon_interval && | |
1105 | !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) | |
1106 | other_chan = wdev->chandef.chan; | |
1107 | wdev_unlock(wdev); | |
1108 | ||
1109 | if (!other_chan) | |
1110 | continue; | |
1111 | ||
1112 | if (chan == other_chan) | |
1113 | return true; | |
1114 | ||
1115 | if (chan->band != NL80211_BAND_5GHZ && | |
1116 | chan->band != NL80211_BAND_6GHZ) | |
1117 | continue; | |
1118 | ||
1119 | r1 = cfg80211_get_unii(chan->center_freq); | |
1120 | r2 = cfg80211_get_unii(other_chan->center_freq); | |
1121 | ||
1122 | if (r1 != -EINVAL && r1 == r2) { | |
1123 | /* | |
1124 | * At some locations channels 149-165 are considered a | |
1125 | * bundle, but at other locations, e.g., Indonesia, | |
1126 | * channels 149-161 are considered a bundle while | |
1127 | * channel 165 is left out and considered to be in a | |
1128 | * different bundle. Thus, in case that there is a | |
1129 | * station interface connected to an AP on channel 165, | |
1130 | * it is assumed that channels 149-161 are allowed for | |
1131 | * GO operations. However, having a station interface | |
1132 | * connected to an AP on channels 149-161, does not | |
1133 | * allow GO operation on channel 165. | |
1134 | */ | |
1135 | if (chan->center_freq == 5825 && | |
1136 | other_chan->center_freq != 5825) | |
1137 | continue; | |
1138 | return true; | |
1139 | } | |
1140 | } | |
1141 | ||
1142 | return false; | |
1143 | } | |
1144 | ||
1145 | static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, | |
1146 | struct cfg80211_chan_def *chandef, | |
1147 | enum nl80211_iftype iftype, | |
1148 | bool check_no_ir) | |
1149 | { | |
1150 | bool res; | |
1151 | u32 prohibited_flags = IEEE80211_CHAN_DISABLED | | |
1152 | IEEE80211_CHAN_RADAR; | |
1153 | ||
1154 | trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); | |
1155 | ||
1156 | if (check_no_ir) | |
1157 | prohibited_flags |= IEEE80211_CHAN_NO_IR; | |
1158 | ||
1159 | if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && | |
1160 | cfg80211_chandef_dfs_available(wiphy, chandef)) { | |
1161 | /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ | |
1162 | prohibited_flags = IEEE80211_CHAN_DISABLED; | |
1163 | } | |
1164 | ||
1165 | res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); | |
1166 | ||
1167 | trace_cfg80211_return_bool(res); | |
1168 | return res; | |
1169 | } | |
1170 | ||
1171 | bool cfg80211_reg_can_beacon(struct wiphy *wiphy, | |
1172 | struct cfg80211_chan_def *chandef, | |
1173 | enum nl80211_iftype iftype) | |
1174 | { | |
1175 | return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); | |
1176 | } | |
1177 | EXPORT_SYMBOL(cfg80211_reg_can_beacon); | |
1178 | ||
1179 | bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, | |
1180 | struct cfg80211_chan_def *chandef, | |
1181 | enum nl80211_iftype iftype) | |
1182 | { | |
1183 | bool check_no_ir; | |
1184 | ||
1185 | ASSERT_RTNL(); | |
1186 | ||
1187 | /* | |
1188 | * Under certain conditions suggested by some regulatory bodies a | |
1189 | * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag | |
1190 | * only if such relaxations are not enabled and the conditions are not | |
1191 | * met. | |
1192 | */ | |
1193 | check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, | |
1194 | chandef->chan); | |
1195 | ||
1196 | return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); | |
1197 | } | |
1198 | EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); | |
1199 | ||
1200 | int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, | |
1201 | struct cfg80211_chan_def *chandef) | |
1202 | { | |
1203 | if (!rdev->ops->set_monitor_channel) | |
1204 | return -EOPNOTSUPP; | |
1205 | if (!cfg80211_has_monitors_only(rdev)) | |
1206 | return -EBUSY; | |
1207 | ||
1208 | return rdev_set_monitor_channel(rdev, chandef); | |
1209 | } | |
1210 | ||
1211 | void | |
1212 | cfg80211_get_chan_state(struct wireless_dev *wdev, | |
1213 | struct ieee80211_channel **chan, | |
1214 | enum cfg80211_chan_mode *chanmode, | |
1215 | u8 *radar_detect) | |
1216 | { | |
1217 | int ret; | |
1218 | ||
1219 | *chan = NULL; | |
1220 | *chanmode = CHAN_MODE_UNDEFINED; | |
1221 | ||
1222 | ASSERT_WDEV_LOCK(wdev); | |
1223 | ||
1224 | if (wdev->netdev && !netif_running(wdev->netdev)) | |
1225 | return; | |
1226 | ||
1227 | switch (wdev->iftype) { | |
1228 | case NL80211_IFTYPE_ADHOC: | |
1229 | if (wdev->current_bss) { | |
1230 | *chan = wdev->current_bss->pub.channel; | |
1231 | *chanmode = (wdev->ibss_fixed && | |
1232 | !wdev->ibss_dfs_possible) | |
1233 | ? CHAN_MODE_SHARED | |
1234 | : CHAN_MODE_EXCLUSIVE; | |
1235 | ||
1236 | /* consider worst-case - IBSS can try to return to the | |
1237 | * original user-specified channel as creator */ | |
1238 | if (wdev->ibss_dfs_possible) | |
1239 | *radar_detect |= BIT(wdev->chandef.width); | |
1240 | return; | |
1241 | } | |
1242 | break; | |
1243 | case NL80211_IFTYPE_STATION: | |
1244 | case NL80211_IFTYPE_P2P_CLIENT: | |
1245 | if (wdev->current_bss) { | |
1246 | *chan = wdev->current_bss->pub.channel; | |
1247 | *chanmode = CHAN_MODE_SHARED; | |
1248 | return; | |
1249 | } | |
1250 | break; | |
1251 | case NL80211_IFTYPE_AP: | |
1252 | case NL80211_IFTYPE_P2P_GO: | |
1253 | if (wdev->cac_started) { | |
1254 | *chan = wdev->chandef.chan; | |
1255 | *chanmode = CHAN_MODE_SHARED; | |
1256 | *radar_detect |= BIT(wdev->chandef.width); | |
1257 | } else if (wdev->beacon_interval) { | |
1258 | *chan = wdev->chandef.chan; | |
1259 | *chanmode = CHAN_MODE_SHARED; | |
1260 | ||
1261 | ret = cfg80211_chandef_dfs_required(wdev->wiphy, | |
1262 | &wdev->chandef, | |
1263 | wdev->iftype); | |
1264 | WARN_ON(ret < 0); | |
1265 | if (ret > 0) | |
1266 | *radar_detect |= BIT(wdev->chandef.width); | |
1267 | } | |
1268 | return; | |
1269 | case NL80211_IFTYPE_MESH_POINT: | |
1270 | if (wdev->mesh_id_len) { | |
1271 | *chan = wdev->chandef.chan; | |
1272 | *chanmode = CHAN_MODE_SHARED; | |
1273 | ||
1274 | ret = cfg80211_chandef_dfs_required(wdev->wiphy, | |
1275 | &wdev->chandef, | |
1276 | wdev->iftype); | |
1277 | WARN_ON(ret < 0); | |
1278 | if (ret > 0) | |
1279 | *radar_detect |= BIT(wdev->chandef.width); | |
1280 | } | |
1281 | return; | |
1282 | case NL80211_IFTYPE_OCB: | |
1283 | if (wdev->chandef.chan) { | |
1284 | *chan = wdev->chandef.chan; | |
1285 | *chanmode = CHAN_MODE_SHARED; | |
1286 | return; | |
1287 | } | |
1288 | break; | |
1289 | case NL80211_IFTYPE_MONITOR: | |
1290 | case NL80211_IFTYPE_AP_VLAN: | |
1291 | case NL80211_IFTYPE_WDS: | |
1292 | case NL80211_IFTYPE_P2P_DEVICE: | |
1293 | case NL80211_IFTYPE_NAN: | |
1294 | /* these interface types don't really have a channel */ | |
1295 | return; | |
1296 | case NL80211_IFTYPE_UNSPECIFIED: | |
1297 | case NUM_NL80211_IFTYPES: | |
1298 | WARN_ON(1); | |
1299 | } | |
1300 | } |