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) { | |
57 | case NL80211_CHAN_WIDTH_20: | |
58 | case NL80211_CHAN_WIDTH_20_NOHT: | |
59 | if (chandef->center_freq1 != control_freq) | |
60 | return false; | |
61 | if (chandef->center_freq2) | |
62 | return false; | |
63 | break; | |
64 | case NL80211_CHAN_WIDTH_40: | |
65 | if (chandef->center_freq1 != control_freq + 10 && | |
66 | chandef->center_freq1 != control_freq - 10) | |
67 | return false; | |
68 | if (chandef->center_freq2) | |
69 | return false; | |
70 | break; | |
71 | case NL80211_CHAN_WIDTH_80P80: | |
72 | if (chandef->center_freq1 != control_freq + 30 && | |
73 | chandef->center_freq1 != control_freq + 10 && | |
74 | chandef->center_freq1 != control_freq - 10 && | |
75 | chandef->center_freq1 != control_freq - 30) | |
76 | return false; | |
77 | if (!chandef->center_freq2) | |
78 | return false; | |
9cab3151 JB |
79 | /* adjacent is not allowed -- that's a 160 MHz channel */ |
80 | if (chandef->center_freq1 - chandef->center_freq2 == 80 || | |
81 | chandef->center_freq2 - chandef->center_freq1 == 80) | |
82 | return false; | |
3d9d1d66 JB |
83 | break; |
84 | case NL80211_CHAN_WIDTH_80: | |
85 | if (chandef->center_freq1 != control_freq + 30 && | |
86 | chandef->center_freq1 != control_freq + 10 && | |
87 | chandef->center_freq1 != control_freq - 10 && | |
88 | chandef->center_freq1 != control_freq - 30) | |
89 | return false; | |
90 | if (chandef->center_freq2) | |
91 | return false; | |
92 | break; | |
93 | case NL80211_CHAN_WIDTH_160: | |
94 | if (chandef->center_freq1 != control_freq + 70 && | |
95 | chandef->center_freq1 != control_freq + 50 && | |
96 | chandef->center_freq1 != control_freq + 30 && | |
97 | chandef->center_freq1 != control_freq + 10 && | |
98 | chandef->center_freq1 != control_freq - 10 && | |
99 | chandef->center_freq1 != control_freq - 30 && | |
100 | chandef->center_freq1 != control_freq - 50 && | |
101 | chandef->center_freq1 != control_freq - 70) | |
102 | return false; | |
103 | if (chandef->center_freq2) | |
104 | return false; | |
105 | break; | |
106 | default: | |
107 | return false; | |
108 | } | |
109 | ||
110 | return true; | |
111 | } | |
9f5e8f6e | 112 | EXPORT_SYMBOL(cfg80211_chandef_valid); |
3d9d1d66 JB |
113 | |
114 | static void chandef_primary_freqs(const struct cfg80211_chan_def *c, | |
115 | int *pri40, int *pri80) | |
116 | { | |
117 | int tmp; | |
118 | ||
119 | switch (c->width) { | |
120 | case NL80211_CHAN_WIDTH_40: | |
121 | *pri40 = c->center_freq1; | |
122 | *pri80 = 0; | |
123 | break; | |
124 | case NL80211_CHAN_WIDTH_80: | |
125 | case NL80211_CHAN_WIDTH_80P80: | |
126 | *pri80 = c->center_freq1; | |
127 | /* n_P20 */ | |
128 | tmp = (30 + c->chan->center_freq - c->center_freq1)/20; | |
129 | /* n_P40 */ | |
130 | tmp /= 2; | |
131 | /* freq_P40 */ | |
132 | *pri40 = c->center_freq1 - 20 + 40 * tmp; | |
133 | break; | |
134 | case NL80211_CHAN_WIDTH_160: | |
135 | /* n_P20 */ | |
136 | tmp = (70 + c->chan->center_freq - c->center_freq1)/20; | |
137 | /* n_P40 */ | |
138 | tmp /= 2; | |
139 | /* freq_P40 */ | |
140 | *pri40 = c->center_freq1 - 60 + 40 * tmp; | |
141 | /* n_P80 */ | |
142 | tmp /= 2; | |
143 | *pri80 = c->center_freq1 - 40 + 80 * tmp; | |
144 | break; | |
145 | default: | |
146 | WARN_ON_ONCE(1); | |
147 | } | |
148 | } | |
149 | ||
04f39047 SW |
150 | static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) |
151 | { | |
152 | int width; | |
153 | ||
154 | switch (c->width) { | |
155 | case NL80211_CHAN_WIDTH_20: | |
156 | case NL80211_CHAN_WIDTH_20_NOHT: | |
157 | width = 20; | |
158 | break; | |
159 | case NL80211_CHAN_WIDTH_40: | |
160 | width = 40; | |
161 | break; | |
162 | case NL80211_CHAN_WIDTH_80P80: | |
163 | case NL80211_CHAN_WIDTH_80: | |
164 | width = 80; | |
165 | break; | |
166 | case NL80211_CHAN_WIDTH_160: | |
167 | width = 160; | |
168 | break; | |
169 | default: | |
170 | WARN_ON_ONCE(1); | |
171 | return -1; | |
172 | } | |
173 | return width; | |
174 | } | |
175 | ||
3d9d1d66 JB |
176 | const struct cfg80211_chan_def * |
177 | cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, | |
178 | const struct cfg80211_chan_def *c2) | |
179 | { | |
180 | u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80; | |
181 | ||
182 | /* If they are identical, return */ | |
183 | if (cfg80211_chandef_identical(c1, c2)) | |
184 | return c1; | |
185 | ||
186 | /* otherwise, must have same control channel */ | |
187 | if (c1->chan != c2->chan) | |
188 | return NULL; | |
189 | ||
190 | /* | |
191 | * If they have the same width, but aren't identical, | |
192 | * then they can't be compatible. | |
193 | */ | |
194 | if (c1->width == c2->width) | |
195 | return NULL; | |
196 | ||
197 | if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || | |
198 | c1->width == NL80211_CHAN_WIDTH_20) | |
199 | return c2; | |
200 | ||
201 | if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || | |
202 | c2->width == NL80211_CHAN_WIDTH_20) | |
203 | return c1; | |
204 | ||
205 | chandef_primary_freqs(c1, &c1_pri40, &c1_pri80); | |
206 | chandef_primary_freqs(c2, &c2_pri40, &c2_pri80); | |
207 | ||
208 | if (c1_pri40 != c2_pri40) | |
209 | return NULL; | |
210 | ||
211 | WARN_ON(!c1_pri80 && !c2_pri80); | |
212 | if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80) | |
213 | return NULL; | |
214 | ||
215 | if (c1->width > c2->width) | |
216 | return c1; | |
217 | return c2; | |
218 | } | |
219 | EXPORT_SYMBOL(cfg80211_chandef_compatible); | |
220 | ||
04f39047 SW |
221 | static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, |
222 | u32 bandwidth, | |
223 | enum nl80211_dfs_state dfs_state) | |
224 | { | |
225 | struct ieee80211_channel *c; | |
226 | u32 freq; | |
227 | ||
228 | for (freq = center_freq - bandwidth/2 + 10; | |
229 | freq <= center_freq + bandwidth/2 - 10; | |
230 | freq += 20) { | |
231 | c = ieee80211_get_channel(wiphy, freq); | |
232 | if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) | |
233 | continue; | |
234 | ||
235 | c->dfs_state = dfs_state; | |
236 | c->dfs_state_entered = jiffies; | |
237 | } | |
238 | } | |
239 | ||
240 | void cfg80211_set_dfs_state(struct wiphy *wiphy, | |
241 | const struct cfg80211_chan_def *chandef, | |
242 | enum nl80211_dfs_state dfs_state) | |
243 | { | |
244 | int width; | |
245 | ||
246 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
247 | return; | |
248 | ||
249 | width = cfg80211_chandef_get_width(chandef); | |
250 | if (width < 0) | |
251 | return; | |
252 | ||
253 | cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1, | |
254 | width, dfs_state); | |
255 | ||
256 | if (!chandef->center_freq2) | |
257 | return; | |
258 | cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2, | |
259 | width, dfs_state); | |
260 | } | |
261 | ||
262 | static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, | |
263 | u32 center_freq, | |
264 | u32 bandwidth) | |
265 | { | |
266 | struct ieee80211_channel *c; | |
267 | u32 freq; | |
268 | ||
269 | for (freq = center_freq - bandwidth/2 + 10; | |
270 | freq <= center_freq + bandwidth/2 - 10; | |
271 | freq += 20) { | |
272 | c = ieee80211_get_channel(wiphy, freq); | |
273 | if (!c) | |
274 | return -EINVAL; | |
275 | ||
276 | if (c->flags & IEEE80211_CHAN_RADAR) | |
277 | return 1; | |
278 | } | |
279 | return 0; | |
280 | } | |
281 | ||
282 | ||
283 | int cfg80211_chandef_dfs_required(struct wiphy *wiphy, | |
284 | const struct cfg80211_chan_def *chandef) | |
285 | { | |
286 | int width; | |
287 | int r; | |
288 | ||
289 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) | |
290 | return -EINVAL; | |
291 | ||
292 | width = cfg80211_chandef_get_width(chandef); | |
293 | if (width < 0) | |
294 | return -EINVAL; | |
295 | ||
296 | r = cfg80211_get_chans_dfs_required(wiphy, chandef->center_freq1, | |
297 | width); | |
298 | if (r) | |
299 | return r; | |
300 | ||
301 | if (!chandef->center_freq2) | |
302 | return 0; | |
303 | ||
304 | return cfg80211_get_chans_dfs_required(wiphy, chandef->center_freq2, | |
305 | width); | |
306 | } | |
307 | ||
9f5e8f6e JB |
308 | static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, |
309 | u32 center_freq, u32 bandwidth, | |
310 | u32 prohibited_flags) | |
3d9d1d66 JB |
311 | { |
312 | struct ieee80211_channel *c; | |
313 | u32 freq; | |
314 | ||
315 | for (freq = center_freq - bandwidth/2 + 10; | |
316 | freq <= center_freq + bandwidth/2 - 10; | |
317 | freq += 20) { | |
318 | c = ieee80211_get_channel(wiphy, freq); | |
04f39047 SW |
319 | if (!c) |
320 | return false; | |
321 | ||
322 | /* check for radar flags */ | |
323 | if ((prohibited_flags & c->flags & IEEE80211_CHAN_RADAR) && | |
324 | (c->dfs_state != NL80211_DFS_AVAILABLE)) | |
325 | return false; | |
326 | ||
327 | /* check for the other flags */ | |
328 | if (c->flags & prohibited_flags & ~IEEE80211_CHAN_RADAR) | |
3d9d1d66 | 329 | return false; |
9236d838 LR |
330 | } |
331 | ||
3d9d1d66 JB |
332 | return true; |
333 | } | |
334 | ||
9f5e8f6e JB |
335 | bool cfg80211_chandef_usable(struct wiphy *wiphy, |
336 | const struct cfg80211_chan_def *chandef, | |
337 | u32 prohibited_flags) | |
3d9d1d66 | 338 | { |
9f5e8f6e JB |
339 | struct ieee80211_sta_ht_cap *ht_cap; |
340 | struct ieee80211_sta_vht_cap *vht_cap; | |
341 | u32 width, control_freq; | |
3d9d1d66 | 342 | |
9f5e8f6e JB |
343 | if (WARN_ON(!cfg80211_chandef_valid(chandef))) |
344 | return false; | |
3d9d1d66 | 345 | |
9f5e8f6e JB |
346 | ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; |
347 | vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; | |
3d9d1d66 | 348 | |
9f5e8f6e | 349 | control_freq = chandef->chan->center_freq; |
9236d838 | 350 | |
3d9d1d66 | 351 | switch (chandef->width) { |
3d9d1d66 | 352 | case NL80211_CHAN_WIDTH_20: |
9f5e8f6e JB |
353 | if (!ht_cap->ht_supported) |
354 | return false; | |
355 | case NL80211_CHAN_WIDTH_20_NOHT: | |
3d9d1d66 JB |
356 | width = 20; |
357 | break; | |
358 | case NL80211_CHAN_WIDTH_40: | |
359 | width = 40; | |
9f5e8f6e JB |
360 | if (!ht_cap->ht_supported) |
361 | return false; | |
362 | if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || | |
363 | ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) | |
364 | return false; | |
365 | if (chandef->center_freq1 < control_freq && | |
366 | chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) | |
367 | return false; | |
368 | if (chandef->center_freq1 > control_freq && | |
369 | chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) | |
370 | return false; | |
3d9d1d66 | 371 | break; |
3d9d1d66 | 372 | case NL80211_CHAN_WIDTH_80P80: |
9f5e8f6e JB |
373 | if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)) |
374 | return false; | |
375 | case NL80211_CHAN_WIDTH_80: | |
376 | if (!vht_cap->vht_supported) | |
377 | return false; | |
c7a6ee27 | 378 | prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; |
3d9d1d66 JB |
379 | width = 80; |
380 | break; | |
381 | case NL80211_CHAN_WIDTH_160: | |
9f5e8f6e JB |
382 | if (!vht_cap->vht_supported) |
383 | return false; | |
384 | if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)) | |
385 | return false; | |
c7a6ee27 | 386 | prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; |
3d9d1d66 JB |
387 | width = 160; |
388 | break; | |
389 | default: | |
390 | WARN_ON_ONCE(1); | |
9236d838 | 391 | return false; |
4ee3e063 | 392 | } |
3d9d1d66 | 393 | |
c7a6ee27 JB |
394 | /* |
395 | * TODO: What if there are only certain 80/160/80+80 MHz channels | |
396 | * allowed by the driver, or only certain combinations? | |
397 | * For 40 MHz the driver can set the NO_HT40 flags, but for | |
398 | * 80/160 MHz and in particular 80+80 MHz this isn't really | |
399 | * feasible and we only have NO_80MHZ/NO_160MHZ so far but | |
400 | * no way to cover 80+80 MHz or more complex restrictions. | |
401 | * Note that such restrictions also need to be advertised to | |
402 | * userspace, for example for P2P channel selection. | |
403 | */ | |
9f5e8f6e | 404 | |
a6662dba JB |
405 | if (width > 20) |
406 | prohibited_flags |= IEEE80211_CHAN_NO_OFDM; | |
407 | ||
9f5e8f6e JB |
408 | if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1, |
409 | width, prohibited_flags)) | |
410 | return false; | |
411 | ||
412 | if (!chandef->center_freq2) | |
413 | return true; | |
414 | return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, | |
415 | width, prohibited_flags); | |
416 | } | |
417 | EXPORT_SYMBOL(cfg80211_chandef_usable); | |
418 | ||
419 | bool cfg80211_reg_can_beacon(struct wiphy *wiphy, | |
420 | struct cfg80211_chan_def *chandef) | |
421 | { | |
422 | bool res; | |
423 | ||
424 | trace_cfg80211_reg_can_beacon(wiphy, chandef); | |
3d9d1d66 | 425 | |
9f5e8f6e JB |
426 | res = cfg80211_chandef_usable(wiphy, chandef, |
427 | IEEE80211_CHAN_DISABLED | | |
428 | IEEE80211_CHAN_PASSIVE_SCAN | | |
429 | IEEE80211_CHAN_NO_IBSS | | |
430 | IEEE80211_CHAN_RADAR); | |
3d9d1d66 JB |
431 | |
432 | trace_cfg80211_return_bool(res); | |
433 | return res; | |
9236d838 | 434 | } |
683b6d3b | 435 | EXPORT_SYMBOL(cfg80211_reg_can_beacon); |
9236d838 | 436 | |
e8c9bd5b | 437 | int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, |
683b6d3b | 438 | struct cfg80211_chan_def *chandef) |
9588bbd5 | 439 | { |
e8c9bd5b | 440 | if (!rdev->ops->set_monitor_channel) |
9588bbd5 | 441 | return -EOPNOTSUPP; |
4f03c1ed MK |
442 | if (!cfg80211_has_monitors_only(rdev)) |
443 | return -EBUSY; | |
9588bbd5 | 444 | |
683b6d3b | 445 | return rdev_set_monitor_channel(rdev, chandef); |
59bbb6f7 | 446 | } |
26ab9a0c MK |
447 | |
448 | void | |
8e95ea49 | 449 | cfg80211_get_chan_state(struct wireless_dev *wdev, |
26ab9a0c MK |
450 | struct ieee80211_channel **chan, |
451 | enum cfg80211_chan_mode *chanmode) | |
452 | { | |
453 | *chan = NULL; | |
454 | *chanmode = CHAN_MODE_UNDEFINED; | |
455 | ||
26ab9a0c MK |
456 | ASSERT_WDEV_LOCK(wdev); |
457 | ||
98104fde | 458 | if (wdev->netdev && !netif_running(wdev->netdev)) |
26ab9a0c MK |
459 | return; |
460 | ||
461 | switch (wdev->iftype) { | |
462 | case NL80211_IFTYPE_ADHOC: | |
463 | if (wdev->current_bss) { | |
464 | *chan = wdev->current_bss->pub.channel; | |
465 | *chanmode = wdev->ibss_fixed | |
466 | ? CHAN_MODE_SHARED | |
467 | : CHAN_MODE_EXCLUSIVE; | |
468 | return; | |
469 | } | |
470 | case NL80211_IFTYPE_STATION: | |
471 | case NL80211_IFTYPE_P2P_CLIENT: | |
472 | if (wdev->current_bss) { | |
473 | *chan = wdev->current_bss->pub.channel; | |
474 | *chanmode = CHAN_MODE_SHARED; | |
475 | return; | |
476 | } | |
477 | break; | |
478 | case NL80211_IFTYPE_AP: | |
479 | case NL80211_IFTYPE_P2P_GO: | |
04f39047 SW |
480 | if (wdev->cac_started) { |
481 | *chan = wdev->channel; | |
482 | *chanmode = CHAN_MODE_SHARED; | |
483 | } else if (wdev->beacon_interval) { | |
f53594a0 FF |
484 | *chan = wdev->channel; |
485 | *chanmode = CHAN_MODE_SHARED; | |
486 | } | |
487 | return; | |
26ab9a0c | 488 | case NL80211_IFTYPE_MESH_POINT: |
f53594a0 FF |
489 | if (wdev->mesh_id_len) { |
490 | *chan = wdev->channel; | |
491 | *chanmode = CHAN_MODE_SHARED; | |
492 | } | |
26ab9a0c MK |
493 | return; |
494 | case NL80211_IFTYPE_MONITOR: | |
495 | case NL80211_IFTYPE_AP_VLAN: | |
496 | case NL80211_IFTYPE_WDS: | |
497 | /* these interface types don't really have a channel */ | |
498 | return; | |
98104fde JB |
499 | case NL80211_IFTYPE_P2P_DEVICE: |
500 | if (wdev->wiphy->features & | |
501 | NL80211_FEATURE_P2P_DEVICE_NEEDS_CHANNEL) | |
502 | *chanmode = CHAN_MODE_EXCLUSIVE; | |
503 | return; | |
26ab9a0c MK |
504 | case NL80211_IFTYPE_UNSPECIFIED: |
505 | case NUM_NL80211_IFTYPES: | |
506 | WARN_ON(1); | |
507 | } | |
508 | ||
509 | return; | |
510 | } |