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