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, | |
118 | int *pri40, int *pri80) | |
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: | |
369 | case NL80211_IFTYPE_P2P_CLIENT: | |
370 | case NL80211_IFTYPE_MONITOR: | |
371 | case NL80211_IFTYPE_AP_VLAN: | |
372 | case NL80211_IFTYPE_WDS: | |
373 | case NL80211_IFTYPE_P2P_DEVICE: | |
2beb6dab | 374 | break; |
00ec75fc | 375 | case NL80211_IFTYPE_UNSPECIFIED: |
2beb6dab LC |
376 | case NUM_NL80211_IFTYPES: |
377 | WARN_ON(1); | |
378 | } | |
379 | ||
380 | return 0; | |
04f39047 | 381 | } |
774f0734 | 382 | EXPORT_SYMBOL(cfg80211_chandef_dfs_required); |
04f39047 | 383 | |
fe7c3a1f JD |
384 | static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, |
385 | u32 center_freq, | |
386 | u32 bandwidth) | |
387 | { | |
388 | struct ieee80211_channel *c; | |
389 | u32 freq, start_freq, end_freq; | |
390 | int count = 0; | |
391 | ||
392 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); | |
393 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
394 | ||
395 | /* | |
396 | * Check entire range of channels for the bandwidth. | |
397 | * Check all channels are DFS channels (DFS_USABLE or | |
398 | * DFS_AVAILABLE). Return number of usable channels | |
399 | * (require CAC). Allow DFS and non-DFS channel mix. | |
400 | */ | |
401 | for (freq = start_freq; freq <= end_freq; freq += 20) { | |
402 | c = ieee80211_get_channel(wiphy, freq); | |
403 | if (!c) | |
404 | return -EINVAL; | |
405 | ||
406 | if (c->flags & IEEE80211_CHAN_DISABLED) | |
407 | return -EINVAL; | |
408 | ||
409 | if (c->flags & IEEE80211_CHAN_RADAR) { | |
410 | if (c->dfs_state == NL80211_DFS_UNAVAILABLE) | |
411 | return -EINVAL; | |
412 | ||
413 | if (c->dfs_state == NL80211_DFS_USABLE) | |
414 | count++; | |
415 | } | |
416 | } | |
417 | ||
418 | return count; | |
419 | } | |
420 | ||
421 | bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, | |
422 | const struct cfg80211_chan_def *chandef) | |
423 | { | |
424 | int width; | |
425 | int r1, r2 = 0; | |
426 | ||
427 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
428 | return false; | |
429 | ||
430 | width = cfg80211_chandef_get_width(chandef); | |
431 | if (width < 0) | |
432 | return false; | |
433 | ||
434 | r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1, | |
435 | width); | |
436 | ||
437 | if (r1 < 0) | |
438 | return false; | |
439 | ||
440 | switch (chandef->width) { | |
441 | case NL80211_CHAN_WIDTH_80P80: | |
442 | WARN_ON(!chandef->center_freq2); | |
443 | r2 = cfg80211_get_chans_dfs_usable(wiphy, | |
444 | chandef->center_freq2, | |
445 | width); | |
446 | if (r2 < 0) | |
447 | return false; | |
448 | break; | |
449 | default: | |
450 | WARN_ON(chandef->center_freq2); | |
451 | break; | |
452 | } | |
453 | ||
454 | return (r1 + r2 > 0); | |
455 | } | |
456 | ||
457 | ||
6bc54fbc JD |
458 | static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, |
459 | u32 center_freq, | |
460 | u32 bandwidth) | |
3d9d1d66 JB |
461 | { |
462 | struct ieee80211_channel *c; | |
2f301ab2 SW |
463 | u32 freq, start_freq, end_freq; |
464 | ||
40d1ba63 JD |
465 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); |
466 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
3d9d1d66 | 467 | |
6bc54fbc JD |
468 | /* |
469 | * Check entire range of channels for the bandwidth. | |
470 | * If any channel in between is disabled or has not | |
471 | * had gone through CAC return false | |
472 | */ | |
2f301ab2 | 473 | for (freq = start_freq; freq <= end_freq; freq += 20) { |
3d9d1d66 | 474 | c = ieee80211_get_channel(wiphy, freq); |
04f39047 SW |
475 | if (!c) |
476 | return false; | |
477 | ||
6bc54fbc JD |
478 | if (c->flags & IEEE80211_CHAN_DISABLED) |
479 | return false; | |
480 | ||
481 | if ((c->flags & IEEE80211_CHAN_RADAR) && | |
04f39047 SW |
482 | (c->dfs_state != NL80211_DFS_AVAILABLE)) |
483 | return false; | |
6bc54fbc JD |
484 | } |
485 | ||
486 | return true; | |
487 | } | |
488 | ||
489 | static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, | |
490 | const struct cfg80211_chan_def *chandef) | |
491 | { | |
492 | int width; | |
493 | int r; | |
494 | ||
495 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
496 | return false; | |
497 | ||
498 | width = cfg80211_chandef_get_width(chandef); | |
499 | if (width < 0) | |
500 | return false; | |
501 | ||
502 | r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1, | |
503 | width); | |
504 | ||
505 | /* If any of channels unavailable for cf1 just return */ | |
506 | if (!r) | |
507 | return r; | |
508 | ||
509 | switch (chandef->width) { | |
510 | case NL80211_CHAN_WIDTH_80P80: | |
511 | WARN_ON(!chandef->center_freq2); | |
512 | r = cfg80211_get_chans_dfs_available(wiphy, | |
513 | chandef->center_freq2, | |
514 | width); | |
515 | default: | |
516 | WARN_ON(chandef->center_freq2); | |
517 | break; | |
518 | } | |
519 | ||
520 | return r; | |
521 | } | |
522 | ||
31559f35 JD |
523 | static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, |
524 | u32 center_freq, | |
525 | u32 bandwidth) | |
526 | { | |
527 | struct ieee80211_channel *c; | |
528 | u32 start_freq, end_freq, freq; | |
529 | unsigned int dfs_cac_ms = 0; | |
530 | ||
531 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); | |
532 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
533 | ||
534 | for (freq = start_freq; freq <= end_freq; freq += 20) { | |
535 | c = ieee80211_get_channel(wiphy, freq); | |
536 | if (!c) | |
537 | return 0; | |
538 | ||
539 | if (c->flags & IEEE80211_CHAN_DISABLED) | |
540 | return 0; | |
541 | ||
542 | if (!(c->flags & IEEE80211_CHAN_RADAR)) | |
543 | continue; | |
544 | ||
545 | if (c->dfs_cac_ms > dfs_cac_ms) | |
546 | dfs_cac_ms = c->dfs_cac_ms; | |
547 | } | |
548 | ||
549 | return dfs_cac_ms; | |
550 | } | |
551 | ||
552 | unsigned int | |
553 | cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, | |
554 | const struct cfg80211_chan_def *chandef) | |
555 | { | |
556 | int width; | |
557 | unsigned int t1 = 0, t2 = 0; | |
558 | ||
559 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
560 | return 0; | |
561 | ||
562 | width = cfg80211_chandef_get_width(chandef); | |
563 | if (width < 0) | |
564 | return 0; | |
565 | ||
566 | t1 = cfg80211_get_chans_dfs_cac_time(wiphy, | |
567 | chandef->center_freq1, | |
568 | width); | |
569 | ||
570 | if (!chandef->center_freq2) | |
571 | return t1; | |
572 | ||
573 | t2 = cfg80211_get_chans_dfs_cac_time(wiphy, | |
574 | chandef->center_freq2, | |
575 | width); | |
576 | ||
577 | return max(t1, t2); | |
578 | } | |
6bc54fbc JD |
579 | |
580 | static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, | |
581 | u32 center_freq, u32 bandwidth, | |
582 | u32 prohibited_flags) | |
583 | { | |
584 | struct ieee80211_channel *c; | |
585 | u32 freq, start_freq, end_freq; | |
04f39047 | 586 | |
6bc54fbc JD |
587 | start_freq = cfg80211_get_start_freq(center_freq, bandwidth); |
588 | end_freq = cfg80211_get_end_freq(center_freq, bandwidth); | |
589 | ||
590 | for (freq = start_freq; freq <= end_freq; freq += 20) { | |
591 | c = ieee80211_get_channel(wiphy, freq); | |
592 | if (!c || c->flags & prohibited_flags) | |
3d9d1d66 | 593 | return false; |
9236d838 LR |
594 | } |
595 | ||
3d9d1d66 JB |
596 | return true; |
597 | } | |
598 | ||
9f5e8f6e JB |
599 | bool cfg80211_chandef_usable(struct wiphy *wiphy, |
600 | const struct cfg80211_chan_def *chandef, | |
601 | u32 prohibited_flags) | |
3d9d1d66 | 602 | { |
9f5e8f6e JB |
603 | struct ieee80211_sta_ht_cap *ht_cap; |
604 | struct ieee80211_sta_vht_cap *vht_cap; | |
605 | u32 width, control_freq; | |
3d9d1d66 | 606 | |
9f5e8f6e JB |
607 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) |
608 | return false; | |
3d9d1d66 | 609 | |
9f5e8f6e JB |
610 | ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; |
611 | vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; | |
3d9d1d66 | 612 | |
9f5e8f6e | 613 | control_freq = chandef->chan->center_freq; |
9236d838 | 614 | |
3d9d1d66 | 615 | switch (chandef->width) { |
2f301ab2 SW |
616 | case NL80211_CHAN_WIDTH_5: |
617 | width = 5; | |
618 | break; | |
619 | case NL80211_CHAN_WIDTH_10: | |
ea077c1c | 620 | prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; |
2f301ab2 SW |
621 | width = 10; |
622 | break; | |
3d9d1d66 | 623 | case NL80211_CHAN_WIDTH_20: |
9f5e8f6e JB |
624 | if (!ht_cap->ht_supported) |
625 | return false; | |
626 | case NL80211_CHAN_WIDTH_20_NOHT: | |
ea077c1c | 627 | prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; |
3d9d1d66 JB |
628 | width = 20; |
629 | break; | |
630 | case NL80211_CHAN_WIDTH_40: | |
631 | width = 40; | |
9f5e8f6e JB |
632 | if (!ht_cap->ht_supported) |
633 | return false; | |
634 | if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || | |
635 | ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) | |
636 | return false; | |
637 | if (chandef->center_freq1 < control_freq && | |
638 | chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) | |
639 | return false; | |
640 | if (chandef->center_freq1 > control_freq && | |
641 | chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) | |
642 | return false; | |
3d9d1d66 | 643 | break; |
3d9d1d66 | 644 | case NL80211_CHAN_WIDTH_80P80: |
9f5e8f6e JB |
645 | if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)) |
646 | return false; | |
647 | case NL80211_CHAN_WIDTH_80: | |
648 | if (!vht_cap->vht_supported) | |
649 | return false; | |
c7a6ee27 | 650 | prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; |
3d9d1d66 JB |
651 | width = 80; |
652 | break; | |
653 | case NL80211_CHAN_WIDTH_160: | |
9f5e8f6e JB |
654 | if (!vht_cap->vht_supported) |
655 | return false; | |
656 | if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)) | |
657 | return false; | |
c7a6ee27 | 658 | prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; |
3d9d1d66 JB |
659 | width = 160; |
660 | break; | |
661 | default: | |
662 | WARN_ON_ONCE(1); | |
9236d838 | 663 | return false; |
4ee3e063 | 664 | } |
3d9d1d66 | 665 | |
c7a6ee27 JB |
666 | /* |
667 | * TODO: What if there are only certain 80/160/80+80 MHz channels | |
668 | * allowed by the driver, or only certain combinations? | |
669 | * For 40 MHz the driver can set the NO_HT40 flags, but for | |
670 | * 80/160 MHz and in particular 80+80 MHz this isn't really | |
671 | * feasible and we only have NO_80MHZ/NO_160MHZ so far but | |
672 | * no way to cover 80+80 MHz or more complex restrictions. | |
673 | * Note that such restrictions also need to be advertised to | |
674 | * userspace, for example for P2P channel selection. | |
675 | */ | |
9f5e8f6e | 676 | |
a6662dba JB |
677 | if (width > 20) |
678 | prohibited_flags |= IEEE80211_CHAN_NO_OFDM; | |
679 | ||
2f301ab2 SW |
680 | /* 5 and 10 MHz are only defined for the OFDM PHY */ |
681 | if (width < 20) | |
682 | prohibited_flags |= IEEE80211_CHAN_NO_OFDM; | |
683 | ||
684 | ||
9f5e8f6e JB |
685 | if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1, |
686 | width, prohibited_flags)) | |
687 | return false; | |
688 | ||
689 | if (!chandef->center_freq2) | |
690 | return true; | |
691 | return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, | |
692 | width, prohibited_flags); | |
693 | } | |
694 | EXPORT_SYMBOL(cfg80211_chandef_usable); | |
695 | ||
174e0cd2 IP |
696 | /* |
697 | * For GO only, check if the channel can be used under permissive conditions | |
698 | * mandated by the some regulatory bodies, i.e., the channel is marked with | |
699 | * IEEE80211_CHAN_GO_CONCURRENT and there is an additional station interface | |
700 | * associated to an AP on the same channel or on the same UNII band | |
701 | * (assuming that the AP is an authorized master). | |
c8866e55 IP |
702 | * In addition allow the GO to operate on a channel on which indoor operation is |
703 | * allowed, iff we are currently operating in an indoor environment. | |
174e0cd2 IP |
704 | */ |
705 | static bool cfg80211_go_permissive_chan(struct cfg80211_registered_device *rdev, | |
706 | struct ieee80211_channel *chan) | |
707 | { | |
708 | struct wireless_dev *wdev_iter; | |
709 | struct wiphy *wiphy = wiphy_idx_to_wiphy(rdev->wiphy_idx); | |
710 | ||
711 | ASSERT_RTNL(); | |
712 | ||
713 | if (!config_enabled(CONFIG_CFG80211_REG_RELAX_NO_IR) || | |
c8866e55 IP |
714 | !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) |
715 | return false; | |
716 | ||
717 | if (regulatory_indoor_allowed() && | |
718 | (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) | |
719 | return true; | |
720 | ||
721 | if (!(chan->flags & IEEE80211_CHAN_GO_CONCURRENT)) | |
174e0cd2 IP |
722 | return false; |
723 | ||
724 | /* | |
725 | * Generally, it is possible to rely on another device/driver to allow | |
726 | * the GO concurrent relaxation, however, since the device can further | |
727 | * enforce the relaxation (by doing a similar verifications as this), | |
728 | * and thus fail the GO instantiation, consider only the interfaces of | |
729 | * the current registered device. | |
730 | */ | |
731 | list_for_each_entry(wdev_iter, &rdev->wdev_list, list) { | |
732 | struct ieee80211_channel *other_chan = NULL; | |
733 | int r1, r2; | |
734 | ||
735 | if (wdev_iter->iftype != NL80211_IFTYPE_STATION || | |
736 | !netif_running(wdev_iter->netdev)) | |
737 | continue; | |
738 | ||
739 | wdev_lock(wdev_iter); | |
740 | if (wdev_iter->current_bss) | |
741 | other_chan = wdev_iter->current_bss->pub.channel; | |
742 | wdev_unlock(wdev_iter); | |
743 | ||
744 | if (!other_chan) | |
745 | continue; | |
746 | ||
747 | if (chan == other_chan) | |
748 | return true; | |
749 | ||
750 | if (chan->band != IEEE80211_BAND_5GHZ) | |
751 | continue; | |
752 | ||
753 | r1 = cfg80211_get_unii(chan->center_freq); | |
754 | r2 = cfg80211_get_unii(other_chan->center_freq); | |
755 | ||
46d53724 IP |
756 | if (r1 != -EINVAL && r1 == r2) { |
757 | /* | |
758 | * At some locations channels 149-165 are considered a | |
759 | * bundle, but at other locations, e.g., Indonesia, | |
760 | * channels 149-161 are considered a bundle while | |
761 | * channel 165 is left out and considered to be in a | |
762 | * different bundle. Thus, in case that there is a | |
763 | * station interface connected to an AP on channel 165, | |
764 | * it is assumed that channels 149-161 are allowed for | |
765 | * GO operations. However, having a station interface | |
766 | * connected to an AP on channels 149-161, does not | |
767 | * allow GO operation on channel 165. | |
768 | */ | |
769 | if (chan->center_freq == 5825 && | |
770 | other_chan->center_freq != 5825) | |
771 | continue; | |
174e0cd2 | 772 | return true; |
46d53724 | 773 | } |
174e0cd2 IP |
774 | } |
775 | ||
776 | return false; | |
777 | } | |
778 | ||
9f5e8f6e | 779 | bool cfg80211_reg_can_beacon(struct wiphy *wiphy, |
174e0cd2 IP |
780 | struct cfg80211_chan_def *chandef, |
781 | enum nl80211_iftype iftype) | |
9f5e8f6e | 782 | { |
f26cbf40 | 783 | struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); |
9f5e8f6e | 784 | bool res; |
6bc54fbc | 785 | u32 prohibited_flags = IEEE80211_CHAN_DISABLED | |
6bc54fbc | 786 | IEEE80211_CHAN_RADAR; |
9f5e8f6e | 787 | |
174e0cd2 IP |
788 | trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype); |
789 | ||
790 | /* | |
791 | * Under certain conditions suggested by the some regulatory bodies | |
792 | * a GO can operate on channels marked with IEEE80211_NO_IR | |
793 | * so set this flag only if such relaxations are not enabled and | |
794 | * the conditions are not met. | |
795 | */ | |
796 | if (iftype != NL80211_IFTYPE_P2P_GO || | |
797 | !cfg80211_go_permissive_chan(rdev, chandef->chan)) | |
798 | prohibited_flags |= IEEE80211_CHAN_NO_IR; | |
3d9d1d66 | 799 | |
00ec75fc | 800 | if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && |
6bc54fbc JD |
801 | cfg80211_chandef_dfs_available(wiphy, chandef)) { |
802 | /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ | |
803 | prohibited_flags = IEEE80211_CHAN_DISABLED; | |
804 | } | |
805 | ||
806 | res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); | |
3d9d1d66 JB |
807 | |
808 | trace_cfg80211_return_bool(res); | |
809 | return res; | |
9236d838 | 810 | } |
683b6d3b | 811 | EXPORT_SYMBOL(cfg80211_reg_can_beacon); |
9236d838 | 812 | |
e8c9bd5b | 813 | int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, |
683b6d3b | 814 | struct cfg80211_chan_def *chandef) |
9588bbd5 | 815 | { |
e8c9bd5b | 816 | if (!rdev->ops->set_monitor_channel) |
9588bbd5 | 817 | return -EOPNOTSUPP; |
4f03c1ed MK |
818 | if (!cfg80211_has_monitors_only(rdev)) |
819 | return -EBUSY; | |
9588bbd5 | 820 | |
683b6d3b | 821 | return rdev_set_monitor_channel(rdev, chandef); |
59bbb6f7 | 822 | } |
26ab9a0c MK |
823 | |
824 | void | |
8e95ea49 | 825 | cfg80211_get_chan_state(struct wireless_dev *wdev, |
26ab9a0c | 826 | struct ieee80211_channel **chan, |
9e0e2961 MK |
827 | enum cfg80211_chan_mode *chanmode, |
828 | u8 *radar_detect) | |
26ab9a0c | 829 | { |
2beb6dab LC |
830 | int ret; |
831 | ||
26ab9a0c MK |
832 | *chan = NULL; |
833 | *chanmode = CHAN_MODE_UNDEFINED; | |
834 | ||
26ab9a0c MK |
835 | ASSERT_WDEV_LOCK(wdev); |
836 | ||
98104fde | 837 | if (wdev->netdev && !netif_running(wdev->netdev)) |
26ab9a0c MK |
838 | return; |
839 | ||
840 | switch (wdev->iftype) { | |
841 | case NL80211_IFTYPE_ADHOC: | |
842 | if (wdev->current_bss) { | |
843 | *chan = wdev->current_bss->pub.channel; | |
5336fa88 SW |
844 | *chanmode = (wdev->ibss_fixed && |
845 | !wdev->ibss_dfs_possible) | |
26ab9a0c MK |
846 | ? CHAN_MODE_SHARED |
847 | : CHAN_MODE_EXCLUSIVE; | |
9e0e2961 MK |
848 | |
849 | /* consider worst-case - IBSS can try to return to the | |
850 | * original user-specified channel as creator */ | |
851 | if (wdev->ibss_dfs_possible) | |
852 | *radar_detect |= BIT(wdev->chandef.width); | |
26ab9a0c MK |
853 | return; |
854 | } | |
0f0094b3 | 855 | break; |
26ab9a0c MK |
856 | case NL80211_IFTYPE_STATION: |
857 | case NL80211_IFTYPE_P2P_CLIENT: | |
858 | if (wdev->current_bss) { | |
859 | *chan = wdev->current_bss->pub.channel; | |
860 | *chanmode = CHAN_MODE_SHARED; | |
861 | return; | |
862 | } | |
863 | break; | |
864 | case NL80211_IFTYPE_AP: | |
865 | case NL80211_IFTYPE_P2P_GO: | |
04f39047 | 866 | if (wdev->cac_started) { |
9e0e2961 | 867 | *chan = wdev->chandef.chan; |
04f39047 | 868 | *chanmode = CHAN_MODE_SHARED; |
9e0e2961 | 869 | *radar_detect |= BIT(wdev->chandef.width); |
04f39047 | 870 | } else if (wdev->beacon_interval) { |
9e0e2961 | 871 | *chan = wdev->chandef.chan; |
f53594a0 | 872 | *chanmode = CHAN_MODE_SHARED; |
9e0e2961 | 873 | |
2beb6dab LC |
874 | ret = cfg80211_chandef_dfs_required(wdev->wiphy, |
875 | &wdev->chandef, | |
876 | wdev->iftype); | |
877 | WARN_ON(ret < 0); | |
878 | if (ret > 0) | |
9e0e2961 | 879 | *radar_detect |= BIT(wdev->chandef.width); |
f53594a0 FF |
880 | } |
881 | return; | |
26ab9a0c | 882 | case NL80211_IFTYPE_MESH_POINT: |
f53594a0 | 883 | if (wdev->mesh_id_len) { |
9e0e2961 | 884 | *chan = wdev->chandef.chan; |
f53594a0 | 885 | *chanmode = CHAN_MODE_SHARED; |
9e0e2961 | 886 | |
2beb6dab LC |
887 | ret = cfg80211_chandef_dfs_required(wdev->wiphy, |
888 | &wdev->chandef, | |
889 | wdev->iftype); | |
890 | WARN_ON(ret < 0); | |
891 | if (ret > 0) | |
9e0e2961 | 892 | *radar_detect |= BIT(wdev->chandef.width); |
f53594a0 | 893 | } |
26ab9a0c MK |
894 | return; |
895 | case NL80211_IFTYPE_MONITOR: | |
896 | case NL80211_IFTYPE_AP_VLAN: | |
897 | case NL80211_IFTYPE_WDS: | |
98104fde | 898 | case NL80211_IFTYPE_P2P_DEVICE: |
e7aceef4 | 899 | /* these interface types don't really have a channel */ |
98104fde | 900 | return; |
26ab9a0c MK |
901 | case NL80211_IFTYPE_UNSPECIFIED: |
902 | case NUM_NL80211_IFTYPES: | |
903 | WARN_ON(1); | |
904 | } | |
26ab9a0c | 905 | } |