Commit | Line | Data |
---|---|---|
59bbb6f7 JB |
1 | /* |
2 | * This file contains helper code to handle channel | |
3 | * settings and keeping track of what is possible at | |
4 | * any point in time. | |
5 | * | |
6 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
2740f0cf | 7 | * Copyright 2013-2014 Intel Mobile Communications GmbH |
59bbb6f7 JB |
8 | */ |
9 | ||
54858ee5 | 10 | #include <linux/export.h> |
59bbb6f7 JB |
11 | #include <net/cfg80211.h> |
12 | #include "core.h" | |
e35e4d28 | 13 | #include "rdev-ops.h" |
59bbb6f7 | 14 | |
3d9d1d66 JB |
15 | void cfg80211_chandef_create(struct cfg80211_chan_def *chandef, |
16 | struct ieee80211_channel *chan, | |
17 | enum nl80211_channel_type chan_type) | |
9236d838 | 18 | { |
3d9d1d66 JB |
19 | if (WARN_ON(!chan)) |
20 | return; | |
9236d838 | 21 | |
3d9d1d66 JB |
22 | chandef->chan = chan; |
23 | chandef->center_freq2 = 0; | |
4ee3e063 | 24 | |
3d9d1d66 JB |
25 | switch (chan_type) { |
26 | case NL80211_CHAN_NO_HT: | |
27 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
28 | chandef->center_freq1 = chan->center_freq; | |
29 | break; | |
30 | case NL80211_CHAN_HT20: | |
31 | chandef->width = NL80211_CHAN_WIDTH_20; | |
32 | chandef->center_freq1 = chan->center_freq; | |
33 | break; | |
9236d838 | 34 | case NL80211_CHAN_HT40PLUS: |
3d9d1d66 JB |
35 | chandef->width = NL80211_CHAN_WIDTH_40; |
36 | chandef->center_freq1 = chan->center_freq + 10; | |
09a02fdb | 37 | break; |
9236d838 | 38 | case NL80211_CHAN_HT40MINUS: |
3d9d1d66 JB |
39 | chandef->width = NL80211_CHAN_WIDTH_40; |
40 | chandef->center_freq1 = chan->center_freq - 10; | |
09a02fdb | 41 | break; |
9236d838 | 42 | default: |
3d9d1d66 JB |
43 | WARN_ON(1); |
44 | } | |
45 | } | |
46 | EXPORT_SYMBOL(cfg80211_chandef_create); | |
47 | ||
9f5e8f6e | 48 | bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) |
3d9d1d66 JB |
49 | { |
50 | u32 control_freq; | |
51 | ||
52 | if (!chandef->chan) | |
53 | return false; | |
54 | ||
55 | control_freq = chandef->chan->center_freq; | |
56 | ||
57 | switch (chandef->width) { | |
2f301ab2 SW |
58 | case NL80211_CHAN_WIDTH_5: |
59 | case NL80211_CHAN_WIDTH_10: | |
3d9d1d66 JB |
60 | case NL80211_CHAN_WIDTH_20: |
61 | case NL80211_CHAN_WIDTH_20_NOHT: | |
62 | if (chandef->center_freq1 != control_freq) | |
63 | return false; | |
64 | if (chandef->center_freq2) | |
65 | return false; | |
66 | break; | |
67 | case NL80211_CHAN_WIDTH_40: | |
68 | if (chandef->center_freq1 != control_freq + 10 && | |
69 | chandef->center_freq1 != control_freq - 10) | |
70 | return false; | |
71 | if (chandef->center_freq2) | |
72 | return false; | |
73 | break; | |
74 | case NL80211_CHAN_WIDTH_80P80: | |
75 | if (chandef->center_freq1 != control_freq + 30 && | |
76 | chandef->center_freq1 != control_freq + 10 && | |
77 | chandef->center_freq1 != control_freq - 10 && | |
78 | chandef->center_freq1 != control_freq - 30) | |
79 | return false; | |
80 | if (!chandef->center_freq2) | |
81 | return false; | |
9cab3151 JB |
82 | /* adjacent is not allowed -- that's a 160 MHz channel */ |
83 | if (chandef->center_freq1 - chandef->center_freq2 == 80 || | |
84 | chandef->center_freq2 - chandef->center_freq1 == 80) | |
85 | return false; | |
3d9d1d66 JB |
86 | break; |
87 | case NL80211_CHAN_WIDTH_80: | |
88 | if (chandef->center_freq1 != control_freq + 30 && | |
89 | chandef->center_freq1 != control_freq + 10 && | |
90 | chandef->center_freq1 != control_freq - 10 && | |
91 | chandef->center_freq1 != control_freq - 30) | |
92 | return false; | |
93 | if (chandef->center_freq2) | |
94 | return false; | |
95 | break; | |
96 | case NL80211_CHAN_WIDTH_160: | |
97 | if (chandef->center_freq1 != control_freq + 70 && | |
98 | chandef->center_freq1 != control_freq + 50 && | |
99 | chandef->center_freq1 != control_freq + 30 && | |
100 | chandef->center_freq1 != control_freq + 10 && | |
101 | chandef->center_freq1 != control_freq - 10 && | |
102 | chandef->center_freq1 != control_freq - 30 && | |
103 | chandef->center_freq1 != control_freq - 50 && | |
104 | chandef->center_freq1 != control_freq - 70) | |
105 | return false; | |
106 | if (chandef->center_freq2) | |
107 | return false; | |
108 | break; | |
109 | default: | |
110 | return false; | |
111 | } | |
112 | ||
113 | return true; | |
114 | } | |
9f5e8f6e | 115 | EXPORT_SYMBOL(cfg80211_chandef_valid); |
3d9d1d66 JB |
116 | |
117 | static void chandef_primary_freqs(const struct cfg80211_chan_def *c, | |
fc1f48ff | 118 | u32 *pri40, u32 *pri80) |
3d9d1d66 JB |
119 | { |
120 | int tmp; | |
121 | ||
122 | switch (c->width) { | |
123 | case NL80211_CHAN_WIDTH_40: | |
124 | *pri40 = c->center_freq1; | |
125 | *pri80 = 0; | |
126 | break; | |
127 | case NL80211_CHAN_WIDTH_80: | |
128 | case NL80211_CHAN_WIDTH_80P80: | |
129 | *pri80 = c->center_freq1; | |
130 | /* n_P20 */ | |
131 | tmp = (30 + c->chan->center_freq - c->center_freq1)/20; | |
132 | /* n_P40 */ | |
133 | tmp /= 2; | |
134 | /* freq_P40 */ | |
135 | *pri40 = c->center_freq1 - 20 + 40 * tmp; | |
136 | break; | |
137 | case NL80211_CHAN_WIDTH_160: | |
138 | /* n_P20 */ | |
139 | tmp = (70 + c->chan->center_freq - c->center_freq1)/20; | |
140 | /* n_P40 */ | |
141 | tmp /= 2; | |
142 | /* freq_P40 */ | |
143 | *pri40 = c->center_freq1 - 60 + 40 * tmp; | |
144 | /* n_P80 */ | |
145 | tmp /= 2; | |
146 | *pri80 = c->center_freq1 - 40 + 80 * tmp; | |
147 | break; | |
148 | default: | |
149 | WARN_ON_ONCE(1); | |
150 | } | |
151 | } | |
152 | ||
04f39047 SW |
153 | static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) |
154 | { | |
155 | int width; | |
156 | ||
157 | switch (c->width) { | |
2f301ab2 SW |
158 | case NL80211_CHAN_WIDTH_5: |
159 | width = 5; | |
160 | break; | |
161 | case NL80211_CHAN_WIDTH_10: | |
162 | width = 10; | |
163 | break; | |
04f39047 SW |
164 | case NL80211_CHAN_WIDTH_20: |
165 | case NL80211_CHAN_WIDTH_20_NOHT: | |
166 | width = 20; | |
167 | break; | |
168 | case NL80211_CHAN_WIDTH_40: | |
169 | width = 40; | |
170 | break; | |
171 | case NL80211_CHAN_WIDTH_80P80: | |
172 | case NL80211_CHAN_WIDTH_80: | |
173 | width = 80; | |
174 | break; | |
175 | case NL80211_CHAN_WIDTH_160: | |
176 | width = 160; | |
177 | break; | |
178 | default: | |
179 | WARN_ON_ONCE(1); | |
180 | return -1; | |
181 | } | |
182 | return width; | |
183 | } | |
184 | ||
3d9d1d66 JB |
185 | const struct cfg80211_chan_def * |
186 | cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, | |
187 | const struct cfg80211_chan_def *c2) | |
188 | { | |
189 | u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80; | |
190 | ||
191 | /* If they are identical, return */ | |
192 | if (cfg80211_chandef_identical(c1, c2)) | |
193 | return c1; | |
194 | ||
195 | /* otherwise, must have same control channel */ | |
196 | if (c1->chan != c2->chan) | |
197 | return NULL; | |
198 | ||
199 | /* | |
200 | * If they have the same width, but aren't identical, | |
201 | * then they can't be compatible. | |
202 | */ | |
203 | if (c1->width == c2->width) | |
204 | return NULL; | |
205 | ||
2f301ab2 SW |
206 | /* |
207 | * can't be compatible if one of them is 5 or 10 MHz, | |
208 | * but they don't have the same width. | |
209 | */ | |
210 | if (c1->width == NL80211_CHAN_WIDTH_5 || | |
211 | c1->width == NL80211_CHAN_WIDTH_10 || | |
212 | c2->width == NL80211_CHAN_WIDTH_5 || | |
213 | c2->width == NL80211_CHAN_WIDTH_10) | |
214 | return NULL; | |
215 | ||
3d9d1d66 JB |
216 | if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || |
217 | c1->width == NL80211_CHAN_WIDTH_20) | |
218 | return c2; | |
219 | ||
220 | if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || | |
221 | c2->width == NL80211_CHAN_WIDTH_20) | |
222 | return c1; | |
223 | ||
224 | chandef_primary_freqs(c1, &c1_pri40, &c1_pri80); | |
225 | chandef_primary_freqs(c2, &c2_pri40, &c2_pri80); | |
226 | ||
227 | if (c1_pri40 != c2_pri40) | |
228 | return NULL; | |
229 | ||
230 | WARN_ON(!c1_pri80 && !c2_pri80); | |
231 | if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80) | |
232 | return NULL; | |
233 | ||
234 | if (c1->width > c2->width) | |
235 | return c1; | |
236 | return c2; | |
237 | } | |
238 | EXPORT_SYMBOL(cfg80211_chandef_compatible); | |
239 | ||
04f39047 SW |
240 | static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, |
241 | u32 bandwidth, | |
242 | enum nl80211_dfs_state dfs_state) | |
243 | { | |
244 | struct ieee80211_channel *c; | |
245 | u32 freq; | |
246 | ||
247 | for (freq = center_freq - bandwidth/2 + 10; | |
248 | freq <= center_freq + bandwidth/2 - 10; | |
249 | freq += 20) { | |
250 | c = ieee80211_get_channel(wiphy, freq); | |
251 | if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) | |
252 | continue; | |
253 | ||
254 | c->dfs_state = dfs_state; | |
255 | c->dfs_state_entered = jiffies; | |
256 | } | |
257 | } | |
258 | ||
259 | void cfg80211_set_dfs_state(struct wiphy *wiphy, | |
260 | const struct cfg80211_chan_def *chandef, | |
261 | enum nl80211_dfs_state dfs_state) | |
262 | { | |
263 | int width; | |
264 | ||
265 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
266 | return; | |
267 | ||
268 | width = cfg80211_chandef_get_width(chandef); | |
269 | if (width < 0) | |
270 | return; | |
271 | ||
272 | cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1, | |
273 | width, dfs_state); | |
274 | ||
275 | if (!chandef->center_freq2) | |
276 | return; | |
277 | cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2, | |
278 | width, dfs_state); | |
279 | } | |
280 | ||
40d1ba63 JD |
281 | static u32 cfg80211_get_start_freq(u32 center_freq, |
282 | u32 bandwidth) | |
283 | { | |
284 | u32 start_freq; | |
285 | ||
286 | if (bandwidth <= 20) | |
287 | start_freq = center_freq; | |
288 | else | |
289 | start_freq = center_freq - bandwidth/2 + 10; | |
290 | ||
291 | return start_freq; | |
292 | } | |
293 | ||
294 | static u32 cfg80211_get_end_freq(u32 center_freq, | |
295 | u32 bandwidth) | |
296 | { | |
297 | u32 end_freq; | |
298 | ||
299 | if (bandwidth <= 20) | |
300 | end_freq = center_freq; | |
301 | else | |
302 | end_freq = center_freq + bandwidth/2 - 10; | |
303 | ||
304 | return end_freq; | |
305 | } | |
306 | ||
04f39047 SW |
307 | static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, |
308 | u32 center_freq, | |
309 | u32 bandwidth) | |
310 | { | |
311 | struct ieee80211_channel *c; | |
2f301ab2 SW |
312 | u32 freq, start_freq, end_freq; |
313 | ||
40d1ba63 JD |
314 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); |
315 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
04f39047 | 316 | |
2f301ab2 | 317 | for (freq = start_freq; freq <= end_freq; freq += 20) { |
04f39047 SW |
318 | c = ieee80211_get_channel(wiphy, freq); |
319 | if (!c) | |
320 | return -EINVAL; | |
321 | ||
322 | if (c->flags & IEEE80211_CHAN_RADAR) | |
323 | return 1; | |
324 | } | |
325 | return 0; | |
326 | } | |
327 | ||
328 | ||
329 | int cfg80211_chandef_dfs_required(struct wiphy *wiphy, | |
2beb6dab LC |
330 | const struct cfg80211_chan_def *chandef, |
331 | enum nl80211_iftype iftype) | |
04f39047 SW |
332 | { |
333 | int width; | |
2beb6dab | 334 | int ret; |
04f39047 SW |
335 | |
336 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
337 | return -EINVAL; | |
338 | ||
2beb6dab LC |
339 | switch (iftype) { |
340 | case NL80211_IFTYPE_ADHOC: | |
341 | case NL80211_IFTYPE_AP: | |
342 | case NL80211_IFTYPE_P2P_GO: | |
343 | case NL80211_IFTYPE_MESH_POINT: | |
344 | width = cfg80211_chandef_get_width(chandef); | |
345 | if (width < 0) | |
346 | return -EINVAL; | |
04f39047 | 347 | |
2beb6dab LC |
348 | ret = cfg80211_get_chans_dfs_required(wiphy, |
349 | chandef->center_freq1, | |
350 | width); | |
351 | if (ret < 0) | |
352 | return ret; | |
353 | else if (ret > 0) | |
354 | return BIT(chandef->width); | |
04f39047 | 355 | |
2beb6dab LC |
356 | if (!chandef->center_freq2) |
357 | return 0; | |
358 | ||
359 | ret = cfg80211_get_chans_dfs_required(wiphy, | |
360 | chandef->center_freq2, | |
361 | width); | |
362 | if (ret < 0) | |
363 | return ret; | |
364 | else if (ret > 0) | |
365 | return BIT(chandef->width); | |
04f39047 | 366 | |
2beb6dab LC |
367 | break; |
368 | case NL80211_IFTYPE_STATION: | |
6e0bd6c3 | 369 | case NL80211_IFTYPE_OCB: |
2beb6dab LC |
370 | case NL80211_IFTYPE_P2P_CLIENT: |
371 | case NL80211_IFTYPE_MONITOR: | |
372 | case NL80211_IFTYPE_AP_VLAN: | |
373 | case NL80211_IFTYPE_WDS: | |
374 | case NL80211_IFTYPE_P2P_DEVICE: | |
2beb6dab | 375 | break; |
00ec75fc | 376 | case NL80211_IFTYPE_UNSPECIFIED: |
2beb6dab LC |
377 | case NUM_NL80211_IFTYPES: |
378 | WARN_ON(1); | |
379 | } | |
380 | ||
381 | return 0; | |
04f39047 | 382 | } |
774f0734 | 383 | EXPORT_SYMBOL(cfg80211_chandef_dfs_required); |
04f39047 | 384 | |
fe7c3a1f JD |
385 | static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, |
386 | u32 center_freq, | |
387 | u32 bandwidth) | |
388 | { | |
389 | struct ieee80211_channel *c; | |
390 | u32 freq, start_freq, end_freq; | |
391 | int count = 0; | |
392 | ||
393 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); | |
394 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
395 | ||
396 | /* | |
397 | * Check entire range of channels for the bandwidth. | |
398 | * Check all channels are DFS channels (DFS_USABLE or | |
399 | * DFS_AVAILABLE). Return number of usable channels | |
400 | * (require CAC). Allow DFS and non-DFS channel mix. | |
401 | */ | |
402 | for (freq = start_freq; freq <= end_freq; freq += 20) { | |
403 | c = ieee80211_get_channel(wiphy, freq); | |
404 | if (!c) | |
405 | return -EINVAL; | |
406 | ||
407 | if (c->flags & IEEE80211_CHAN_DISABLED) | |
408 | return -EINVAL; | |
409 | ||
410 | if (c->flags & IEEE80211_CHAN_RADAR) { | |
411 | if (c->dfs_state == NL80211_DFS_UNAVAILABLE) | |
412 | return -EINVAL; | |
413 | ||
414 | if (c->dfs_state == NL80211_DFS_USABLE) | |
415 | count++; | |
416 | } | |
417 | } | |
418 | ||
419 | return count; | |
420 | } | |
421 | ||
422 | bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, | |
423 | const struct cfg80211_chan_def *chandef) | |
424 | { | |
425 | int width; | |
426 | int r1, r2 = 0; | |
427 | ||
428 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
429 | return false; | |
430 | ||
431 | width = cfg80211_chandef_get_width(chandef); | |
432 | if (width < 0) | |
433 | return false; | |
434 | ||
435 | r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1, | |
436 | width); | |
437 | ||
438 | if (r1 < 0) | |
439 | return false; | |
440 | ||
441 | switch (chandef->width) { | |
442 | case NL80211_CHAN_WIDTH_80P80: | |
443 | WARN_ON(!chandef->center_freq2); | |
444 | r2 = cfg80211_get_chans_dfs_usable(wiphy, | |
445 | chandef->center_freq2, | |
446 | width); | |
447 | if (r2 < 0) | |
448 | return false; | |
449 | break; | |
450 | default: | |
451 | WARN_ON(chandef->center_freq2); | |
452 | break; | |
453 | } | |
454 | ||
455 | return (r1 + r2 > 0); | |
456 | } | |
457 | ||
458 | ||
6bc54fbc JD |
459 | static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, |
460 | u32 center_freq, | |
461 | u32 bandwidth) | |
3d9d1d66 JB |
462 | { |
463 | struct ieee80211_channel *c; | |
2f301ab2 SW |
464 | u32 freq, start_freq, end_freq; |
465 | ||
40d1ba63 JD |
466 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); |
467 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
3d9d1d66 | 468 | |
6bc54fbc JD |
469 | /* |
470 | * Check entire range of channels for the bandwidth. | |
471 | * If any channel in between is disabled or has not | |
472 | * had gone through CAC return false | |
473 | */ | |
2f301ab2 | 474 | for (freq = start_freq; freq <= end_freq; freq += 20) { |
3d9d1d66 | 475 | c = ieee80211_get_channel(wiphy, freq); |
04f39047 SW |
476 | if (!c) |
477 | return false; | |
478 | ||
6bc54fbc JD |
479 | if (c->flags & IEEE80211_CHAN_DISABLED) |
480 | return false; | |
481 | ||
482 | if ((c->flags & IEEE80211_CHAN_RADAR) && | |
04f39047 SW |
483 | (c->dfs_state != NL80211_DFS_AVAILABLE)) |
484 | return false; | |
6bc54fbc JD |
485 | } |
486 | ||
487 | return true; | |
488 | } | |
489 | ||
490 | static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, | |
491 | const struct cfg80211_chan_def *chandef) | |
492 | { | |
493 | int width; | |
494 | int r; | |
495 | ||
496 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
497 | return false; | |
498 | ||
499 | width = cfg80211_chandef_get_width(chandef); | |
500 | if (width < 0) | |
501 | return false; | |
502 | ||
503 | r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1, | |
504 | width); | |
505 | ||
506 | /* If any of channels unavailable for cf1 just return */ | |
507 | if (!r) | |
508 | return r; | |
509 | ||
510 | switch (chandef->width) { | |
511 | case NL80211_CHAN_WIDTH_80P80: | |
512 | WARN_ON(!chandef->center_freq2); | |
513 | r = cfg80211_get_chans_dfs_available(wiphy, | |
514 | chandef->center_freq2, | |
515 | width); | |
516 | default: | |
517 | WARN_ON(chandef->center_freq2); | |
518 | break; | |
519 | } | |
520 | ||
521 | return r; | |
522 | } | |
523 | ||
31559f35 JD |
524 | static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, |
525 | u32 center_freq, | |
526 | u32 bandwidth) | |
527 | { | |
528 | struct ieee80211_channel *c; | |
529 | u32 start_freq, end_freq, freq; | |
530 | unsigned int dfs_cac_ms = 0; | |
531 | ||
532 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); | |
533 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
534 | ||
535 | for (freq = start_freq; freq <= end_freq; freq += 20) { | |
536 | c = ieee80211_get_channel(wiphy, freq); | |
537 | if (!c) | |
538 | return 0; | |
539 | ||
540 | if (c->flags & IEEE80211_CHAN_DISABLED) | |
541 | return 0; | |
542 | ||
543 | if (!(c->flags & IEEE80211_CHAN_RADAR)) | |
544 | continue; | |
545 | ||
546 | if (c->dfs_cac_ms > dfs_cac_ms) | |
547 | dfs_cac_ms = c->dfs_cac_ms; | |
548 | } | |
549 | ||
550 | return dfs_cac_ms; | |
551 | } | |
552 | ||
553 | unsigned int | |
554 | cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, | |
555 | const struct cfg80211_chan_def *chandef) | |
556 | { | |
557 | int width; | |
558 | unsigned int t1 = 0, t2 = 0; | |
559 | ||
560 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
561 | return 0; | |
562 | ||
563 | width = cfg80211_chandef_get_width(chandef); | |
564 | if (width < 0) | |
565 | return 0; | |
566 | ||
567 | t1 = cfg80211_get_chans_dfs_cac_time(wiphy, | |
568 | chandef->center_freq1, | |
569 | width); | |
570 | ||
571 | if (!chandef->center_freq2) | |
572 | return t1; | |
573 | ||
574 | t2 = cfg80211_get_chans_dfs_cac_time(wiphy, | |
575 | chandef->center_freq2, | |
576 | width); | |
577 | ||
578 | return max(t1, t2); | |
579 | } | |
6bc54fbc JD |
580 | |
581 | static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, | |
582 | u32 center_freq, u32 bandwidth, | |
583 | u32 prohibited_flags) | |
584 | { | |
585 | struct ieee80211_channel *c; | |
586 | u32 freq, start_freq, end_freq; | |
04f39047 | 587 | |
6bc54fbc JD |
588 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); |
589 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
590 | ||
591 | for (freq = start_freq; freq <= end_freq; freq += 20) { | |
592 | c = ieee80211_get_channel(wiphy, freq); | |
593 | if (!c || c->flags & prohibited_flags) | |
3d9d1d66 | 594 | return false; |
9236d838 LR |
595 | } |
596 | ||
3d9d1d66 JB |
597 | return true; |
598 | } | |
599 | ||
9f5e8f6e JB |
600 | bool cfg80211_chandef_usable(struct wiphy *wiphy, |
601 | const struct cfg80211_chan_def *chandef, | |
602 | u32 prohibited_flags) | |
3d9d1d66 | 603 | { |
9f5e8f6e JB |
604 | struct ieee80211_sta_ht_cap *ht_cap; |
605 | struct ieee80211_sta_vht_cap *vht_cap; | |
606 | u32 width, control_freq; | |
3d9d1d66 | 607 | |
9f5e8f6e JB |
608 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) |
609 | return false; | |
3d9d1d66 | 610 | |
9f5e8f6e JB |
611 | ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; |
612 | vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; | |
3d9d1d66 | 613 | |
9f5e8f6e | 614 | control_freq = chandef->chan->center_freq; |
9236d838 | 615 | |
3d9d1d66 | 616 | switch (chandef->width) { |
2f301ab2 SW |
617 | case NL80211_CHAN_WIDTH_5: |
618 | width = 5; | |
619 | break; | |
620 | case NL80211_CHAN_WIDTH_10: | |
ea077c1c | 621 | prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; |
2f301ab2 SW |
622 | width = 10; |
623 | break; | |
3d9d1d66 | 624 | case NL80211_CHAN_WIDTH_20: |
9f5e8f6e JB |
625 | if (!ht_cap->ht_supported) |
626 | return false; | |
627 | case NL80211_CHAN_WIDTH_20_NOHT: | |
ea077c1c | 628 | prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; |
3d9d1d66 JB |
629 | width = 20; |
630 | break; | |
631 | case NL80211_CHAN_WIDTH_40: | |
632 | width = 40; | |
9f5e8f6e JB |
633 | if (!ht_cap->ht_supported) |
634 | return false; | |
635 | if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || | |
636 | ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) | |
637 | return false; | |
638 | if (chandef->center_freq1 < control_freq && | |
639 | chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) | |
640 | return false; | |
641 | if (chandef->center_freq1 > control_freq && | |
642 | chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) | |
643 | return false; | |
3d9d1d66 | 644 | break; |
3d9d1d66 | 645 | case NL80211_CHAN_WIDTH_80P80: |
9f5e8f6e JB |
646 | if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)) |
647 | return false; | |
648 | case NL80211_CHAN_WIDTH_80: | |
649 | if (!vht_cap->vht_supported) | |
650 | return false; | |
c7a6ee27 | 651 | prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; |
3d9d1d66 JB |
652 | width = 80; |
653 | break; | |
654 | case NL80211_CHAN_WIDTH_160: | |
9f5e8f6e JB |
655 | if (!vht_cap->vht_supported) |
656 | return false; | |
657 | if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)) | |
658 | return false; | |
c7a6ee27 | 659 | prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; |
3d9d1d66 JB |
660 | width = 160; |
661 | break; | |
662 | default: | |
663 | WARN_ON_ONCE(1); | |
9236d838 | 664 | return false; |
4ee3e063 | 665 | } |
3d9d1d66 | 666 | |
c7a6ee27 JB |
667 | /* |
668 | * TODO: What if there are only certain 80/160/80+80 MHz channels | |
669 | * allowed by the driver, or only certain combinations? | |
670 | * For 40 MHz the driver can set the NO_HT40 flags, but for | |
671 | * 80/160 MHz and in particular 80+80 MHz this isn't really | |
672 | * feasible and we only have NO_80MHZ/NO_160MHZ so far but | |
673 | * no way to cover 80+80 MHz or more complex restrictions. | |
674 | * Note that such restrictions also need to be advertised to | |
675 | * userspace, for example for P2P channel selection. | |
676 | */ | |
9f5e8f6e | 677 | |
a6662dba JB |
678 | if (width > 20) |
679 | prohibited_flags |= IEEE80211_CHAN_NO_OFDM; | |
680 | ||
2f301ab2 SW |
681 | /* 5 and 10 MHz are only defined for the OFDM PHY */ |
682 | if (width < 20) | |
683 | prohibited_flags |= IEEE80211_CHAN_NO_OFDM; | |
684 | ||
685 | ||
9f5e8f6e JB |
686 | if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1, |
687 | width, prohibited_flags)) | |
688 | return false; | |
689 | ||
690 | if (!chandef->center_freq2) | |
691 | return true; | |
692 | return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, | |
693 | width, prohibited_flags); | |
694 | } | |
695 | EXPORT_SYMBOL(cfg80211_chandef_usable); | |
696 | ||
174e0cd2 IP |
697 | /* |
698 | * For GO only, check if the channel can be used under permissive conditions | |
699 | * mandated by the some regulatory bodies, i.e., the channel is marked with | |
700 | * IEEE80211_CHAN_GO_CONCURRENT and there is an additional station interface | |
701 | * associated to an AP on the same channel or on the same UNII band | |
702 | * (assuming that the AP is an authorized master). | |
c8866e55 IP |
703 | * In addition allow the GO to operate on a channel on which indoor operation is |
704 | * allowed, iff we are currently operating in an indoor environment. | |
174e0cd2 IP |
705 | */ |
706 | static bool cfg80211_go_permissive_chan(struct cfg80211_registered_device *rdev, | |
707 | struct ieee80211_channel *chan) | |
708 | { | |
709 | struct wireless_dev *wdev_iter; | |
710 | struct wiphy *wiphy = wiphy_idx_to_wiphy(rdev->wiphy_idx); | |
711 | ||
712 | ASSERT_RTNL(); | |
713 | ||
714 | if (!config_enabled(CONFIG_CFG80211_REG_RELAX_NO_IR) || | |
c8866e55 IP |
715 | !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) |
716 | return false; | |
717 | ||
718 | if (regulatory_indoor_allowed() && | |
719 | (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) | |
720 | return true; | |
721 | ||
722 | if (!(chan->flags & IEEE80211_CHAN_GO_CONCURRENT)) | |
174e0cd2 IP |
723 | return false; |
724 | ||
725 | /* | |
726 | * Generally, it is possible to rely on another device/driver to allow | |
727 | * the GO concurrent relaxation, however, since the device can further | |
728 | * enforce the relaxation (by doing a similar verifications as this), | |
729 | * and thus fail the GO instantiation, consider only the interfaces of | |
730 | * the current registered device. | |
731 | */ | |
732 | list_for_each_entry(wdev_iter, &rdev->wdev_list, list) { | |
733 | struct ieee80211_channel *other_chan = NULL; | |
734 | int r1, r2; | |
735 | ||
736 | if (wdev_iter->iftype != NL80211_IFTYPE_STATION || | |
737 | !netif_running(wdev_iter->netdev)) | |
738 | continue; | |
739 | ||
740 | wdev_lock(wdev_iter); | |
741 | if (wdev_iter->current_bss) | |
742 | other_chan = wdev_iter->current_bss->pub.channel; | |
743 | wdev_unlock(wdev_iter); | |
744 | ||
745 | if (!other_chan) | |
746 | continue; | |
747 | ||
748 | if (chan == other_chan) | |
749 | return true; | |
750 | ||
751 | if (chan->band != IEEE80211_BAND_5GHZ) | |
752 | continue; | |
753 | ||
754 | r1 = cfg80211_get_unii(chan->center_freq); | |
755 | r2 = cfg80211_get_unii(other_chan->center_freq); | |
756 | ||
46d53724 IP |
757 | if (r1 != -EINVAL && r1 == r2) { |
758 | /* | |
759 | * At some locations channels 149-165 are considered a | |
760 | * bundle, but at other locations, e.g., Indonesia, | |
761 | * channels 149-161 are considered a bundle while | |
762 | * channel 165 is left out and considered to be in a | |
763 | * different bundle. Thus, in case that there is a | |
764 | * station interface connected to an AP on channel 165, | |
765 | * it is assumed that channels 149-161 are allowed for | |
766 | * GO operations. However, having a station interface | |
767 | * connected to an AP on channels 149-161, does not | |
768 | * allow GO operation on channel 165. | |
769 | */ | |
770 | if (chan->center_freq == 5825 && | |
771 | other_chan->center_freq != 5825) | |
772 | continue; | |
174e0cd2 | 773 | return true; |
46d53724 | 774 | } |
174e0cd2 IP |
775 | } |
776 | ||
777 | return false; | |
778 | } | |
779 | ||
9f5e8f6e | 780 | bool cfg80211_reg_can_beacon(struct wiphy *wiphy, |
174e0cd2 IP |
781 | struct cfg80211_chan_def *chandef, |
782 | enum nl80211_iftype iftype) | |
9f5e8f6e | 783 | { |
f26cbf40 | 784 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
9f5e8f6e | 785 | bool res; |
6bc54fbc | 786 | u32 prohibited_flags = IEEE80211_CHAN_DISABLED | |
6bc54fbc | 787 | IEEE80211_CHAN_RADAR; |
9f5e8f6e | 788 | |
174e0cd2 IP |
789 | trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype); |
790 | ||
791 | /* | |
792 | * Under certain conditions suggested by the some regulatory bodies | |
793 | * a GO can operate on channels marked with IEEE80211_NO_IR | |
794 | * so set this flag only if such relaxations are not enabled and | |
795 | * the conditions are not met. | |
796 | */ | |
797 | if (iftype != NL80211_IFTYPE_P2P_GO || | |
798 | !cfg80211_go_permissive_chan(rdev, chandef->chan)) | |
799 | prohibited_flags |= IEEE80211_CHAN_NO_IR; | |
3d9d1d66 | 800 | |
00ec75fc | 801 | if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && |
6bc54fbc JD |
802 | cfg80211_chandef_dfs_available(wiphy, chandef)) { |
803 | /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ | |
804 | prohibited_flags = IEEE80211_CHAN_DISABLED; | |
805 | } | |
806 | ||
807 | res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); | |
3d9d1d66 JB |
808 | |
809 | trace_cfg80211_return_bool(res); | |
810 | return res; | |
9236d838 | 811 | } |
683b6d3b | 812 | EXPORT_SYMBOL(cfg80211_reg_can_beacon); |
9236d838 | 813 | |
e8c9bd5b | 814 | int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, |
683b6d3b | 815 | struct cfg80211_chan_def *chandef) |
9588bbd5 | 816 | { |
e8c9bd5b | 817 | if (!rdev->ops->set_monitor_channel) |
9588bbd5 | 818 | return -EOPNOTSUPP; |
4f03c1ed MK |
819 | if (!cfg80211_has_monitors_only(rdev)) |
820 | return -EBUSY; | |
9588bbd5 | 821 | |
683b6d3b | 822 | return rdev_set_monitor_channel(rdev, chandef); |
59bbb6f7 | 823 | } |
26ab9a0c MK |
824 | |
825 | void | |
8e95ea49 | 826 | cfg80211_get_chan_state(struct wireless_dev *wdev, |
26ab9a0c | 827 | struct ieee80211_channel **chan, |
9e0e2961 MK |
828 | enum cfg80211_chan_mode *chanmode, |
829 | u8 *radar_detect) | |
26ab9a0c | 830 | { |
2beb6dab LC |
831 | int ret; |
832 | ||
26ab9a0c MK |
833 | *chan = NULL; |
834 | *chanmode = CHAN_MODE_UNDEFINED; | |
835 | ||
26ab9a0c MK |
836 | ASSERT_WDEV_LOCK(wdev); |
837 | ||
98104fde | 838 | if (wdev->netdev && !netif_running(wdev->netdev)) |
26ab9a0c MK |
839 | return; |
840 | ||
841 | switch (wdev->iftype) { | |
842 | case NL80211_IFTYPE_ADHOC: | |
843 | if (wdev->current_bss) { | |
844 | *chan = wdev->current_bss->pub.channel; | |
5336fa88 SW |
845 | *chanmode = (wdev->ibss_fixed && |
846 | !wdev->ibss_dfs_possible) | |
26ab9a0c MK |
847 | ? CHAN_MODE_SHARED |
848 | : CHAN_MODE_EXCLUSIVE; | |
9e0e2961 MK |
849 | |
850 | /* consider worst-case - IBSS can try to return to the | |
851 | * original user-specified channel as creator */ | |
852 | if (wdev->ibss_dfs_possible) | |
853 | *radar_detect |= BIT(wdev->chandef.width); | |
26ab9a0c MK |
854 | return; |
855 | } | |
0f0094b3 | 856 | break; |
26ab9a0c MK |
857 | case NL80211_IFTYPE_STATION: |
858 | case NL80211_IFTYPE_P2P_CLIENT: | |
859 | if (wdev->current_bss) { | |
860 | *chan = wdev->current_bss->pub.channel; | |
861 | *chanmode = CHAN_MODE_SHARED; | |
862 | return; | |
863 | } | |
864 | break; | |
865 | case NL80211_IFTYPE_AP: | |
866 | case NL80211_IFTYPE_P2P_GO: | |
04f39047 | 867 | if (wdev->cac_started) { |
9e0e2961 | 868 | *chan = wdev->chandef.chan; |
04f39047 | 869 | *chanmode = CHAN_MODE_SHARED; |
9e0e2961 | 870 | *radar_detect |= BIT(wdev->chandef.width); |
04f39047 | 871 | } else if (wdev->beacon_interval) { |
9e0e2961 | 872 | *chan = wdev->chandef.chan; |
f53594a0 | 873 | *chanmode = CHAN_MODE_SHARED; |
9e0e2961 | 874 | |
2beb6dab LC |
875 | ret = cfg80211_chandef_dfs_required(wdev->wiphy, |
876 | &wdev->chandef, | |
877 | wdev->iftype); | |
878 | WARN_ON(ret < 0); | |
879 | if (ret > 0) | |
9e0e2961 | 880 | *radar_detect |= BIT(wdev->chandef.width); |
f53594a0 FF |
881 | } |
882 | return; | |
26ab9a0c | 883 | case NL80211_IFTYPE_MESH_POINT: |
f53594a0 | 884 | if (wdev->mesh_id_len) { |
9e0e2961 | 885 | *chan = wdev->chandef.chan; |
f53594a0 | 886 | *chanmode = CHAN_MODE_SHARED; |
9e0e2961 | 887 | |
2beb6dab LC |
888 | ret = cfg80211_chandef_dfs_required(wdev->wiphy, |
889 | &wdev->chandef, | |
890 | wdev->iftype); | |
891 | WARN_ON(ret < 0); | |
892 | if (ret > 0) | |
9e0e2961 | 893 | *radar_detect |= BIT(wdev->chandef.width); |
f53594a0 | 894 | } |
26ab9a0c | 895 | return; |
6e0bd6c3 RL |
896 | case NL80211_IFTYPE_OCB: |
897 | if (wdev->chandef.chan) { | |
898 | *chan = wdev->chandef.chan; | |
899 | *chanmode = CHAN_MODE_SHARED; | |
900 | return; | |
901 | } | |
902 | break; | |
26ab9a0c MK |
903 | case NL80211_IFTYPE_MONITOR: |
904 | case NL80211_IFTYPE_AP_VLAN: | |
905 | case NL80211_IFTYPE_WDS: | |
98104fde | 906 | case NL80211_IFTYPE_P2P_DEVICE: |
e7aceef4 | 907 | /* these interface types don't really have a channel */ |
98104fde | 908 | return; |
26ab9a0c MK |
909 | case NL80211_IFTYPE_UNSPECIFIED: |
910 | case NUM_NL80211_IFTYPES: | |
911 | WARN_ON(1); | |
912 | } | |
26ab9a0c | 913 | } |