Commit | Line | Data |
---|---|---|
f444de05 JB |
1 | /* |
2 | * mac80211 - channel management | |
3 | */ | |
4 | ||
0aaffa9b | 5 | #include <linux/nl80211.h> |
3448c005 | 6 | #include <linux/export.h> |
4d76d21b | 7 | #include <linux/rtnetlink.h> |
3117bbdb | 8 | #include <net/cfg80211.h> |
f444de05 | 9 | #include "ieee80211_i.h" |
35f2fce9 | 10 | #include "driver-ops.h" |
f444de05 | 11 | |
18942d3b | 12 | static void ieee80211_change_chanctx(struct ieee80211_local *local, |
4bf88530 JB |
13 | struct ieee80211_chanctx *ctx, |
14 | const struct cfg80211_chan_def *chandef) | |
23a85b45 | 15 | { |
4bf88530 | 16 | if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) |
e89a96f5 | 17 | return; |
0aaffa9b | 18 | |
4bf88530 JB |
19 | WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef)); |
20 | ||
21 | ctx->conf.def = *chandef; | |
22 | drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH); | |
55de908a JB |
23 | |
24 | if (!local->use_chanctx) { | |
4bf88530 | 25 | local->_oper_channel_type = cfg80211_get_chandef_type(chandef); |
55de908a JB |
26 | ieee80211_hw_config(local, 0); |
27 | } | |
0aaffa9b | 28 | } |
d01a1e65 MK |
29 | |
30 | static struct ieee80211_chanctx * | |
31 | ieee80211_find_chanctx(struct ieee80211_local *local, | |
4bf88530 | 32 | const struct cfg80211_chan_def *chandef, |
d01a1e65 MK |
33 | enum ieee80211_chanctx_mode mode) |
34 | { | |
35 | struct ieee80211_chanctx *ctx; | |
36 | ||
37 | lockdep_assert_held(&local->chanctx_mtx); | |
38 | ||
39 | if (mode == IEEE80211_CHANCTX_EXCLUSIVE) | |
40 | return NULL; | |
d01a1e65 MK |
41 | |
42 | list_for_each_entry(ctx, &local->chanctx_list, list) { | |
4bf88530 | 43 | const struct cfg80211_chan_def *compat; |
e89a96f5 | 44 | |
d01a1e65 MK |
45 | if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) |
46 | continue; | |
4bf88530 JB |
47 | |
48 | compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef); | |
49 | if (!compat) | |
d01a1e65 MK |
50 | continue; |
51 | ||
18942d3b | 52 | ieee80211_change_chanctx(local, ctx, compat); |
e89a96f5 | 53 | |
d01a1e65 MK |
54 | return ctx; |
55 | } | |
56 | ||
57 | return NULL; | |
58 | } | |
59 | ||
60 | static struct ieee80211_chanctx * | |
61 | ieee80211_new_chanctx(struct ieee80211_local *local, | |
4bf88530 | 62 | const struct cfg80211_chan_def *chandef, |
d01a1e65 MK |
63 | enum ieee80211_chanctx_mode mode) |
64 | { | |
65 | struct ieee80211_chanctx *ctx; | |
35f2fce9 | 66 | int err; |
d01a1e65 MK |
67 | |
68 | lockdep_assert_held(&local->chanctx_mtx); | |
69 | ||
70 | ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); | |
71 | if (!ctx) | |
72 | return ERR_PTR(-ENOMEM); | |
73 | ||
4bf88530 | 74 | ctx->conf.def = *chandef; |
04ecd257 JB |
75 | ctx->conf.rx_chains_static = 1; |
76 | ctx->conf.rx_chains_dynamic = 1; | |
d01a1e65 MK |
77 | ctx->mode = mode; |
78 | ||
55de908a | 79 | if (!local->use_chanctx) { |
4bf88530 JB |
80 | local->_oper_channel_type = |
81 | cfg80211_get_chandef_type(chandef); | |
82 | local->_oper_channel = chandef->chan; | |
55de908a JB |
83 | ieee80211_hw_config(local, 0); |
84 | } else { | |
85 | err = drv_add_chanctx(local, ctx); | |
86 | if (err) { | |
87 | kfree(ctx); | |
88 | return ERR_PTR(err); | |
89 | } | |
35f2fce9 MK |
90 | } |
91 | ||
3448c005 | 92 | list_add_rcu(&ctx->list, &local->chanctx_list); |
d01a1e65 | 93 | |
fd0f979a JB |
94 | mutex_lock(&local->mtx); |
95 | ieee80211_recalc_idle(local); | |
96 | mutex_unlock(&local->mtx); | |
97 | ||
d01a1e65 MK |
98 | return ctx; |
99 | } | |
100 | ||
101 | static void ieee80211_free_chanctx(struct ieee80211_local *local, | |
102 | struct ieee80211_chanctx *ctx) | |
103 | { | |
104 | lockdep_assert_held(&local->chanctx_mtx); | |
105 | ||
106 | WARN_ON_ONCE(ctx->refcount != 0); | |
107 | ||
55de908a JB |
108 | if (!local->use_chanctx) { |
109 | local->_oper_channel_type = NL80211_CHAN_NO_HT; | |
110 | ieee80211_hw_config(local, 0); | |
111 | } else { | |
112 | drv_remove_chanctx(local, ctx); | |
113 | } | |
35f2fce9 | 114 | |
3448c005 | 115 | list_del_rcu(&ctx->list); |
d01a1e65 | 116 | kfree_rcu(ctx, rcu_head); |
fd0f979a JB |
117 | |
118 | mutex_lock(&local->mtx); | |
119 | ieee80211_recalc_idle(local); | |
120 | mutex_unlock(&local->mtx); | |
d01a1e65 MK |
121 | } |
122 | ||
123 | static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, | |
124 | struct ieee80211_chanctx *ctx) | |
125 | { | |
35f2fce9 MK |
126 | struct ieee80211_local *local = sdata->local; |
127 | int ret; | |
d01a1e65 MK |
128 | |
129 | lockdep_assert_held(&local->chanctx_mtx); | |
130 | ||
35f2fce9 MK |
131 | ret = drv_assign_vif_chanctx(local, sdata, ctx); |
132 | if (ret) | |
133 | return ret; | |
134 | ||
d01a1e65 MK |
135 | rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf); |
136 | ctx->refcount++; | |
137 | ||
1ea6f9c0 | 138 | ieee80211_recalc_txpower(sdata); |
fd0f979a | 139 | sdata->vif.bss_conf.idle = false; |
5bbe754d JB |
140 | |
141 | if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && | |
142 | sdata->vif.type != NL80211_IFTYPE_MONITOR) | |
143 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE); | |
1ea6f9c0 | 144 | |
d01a1e65 MK |
145 | return 0; |
146 | } | |
147 | ||
4bf88530 JB |
148 | static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local, |
149 | struct ieee80211_chanctx *ctx) | |
e89a96f5 MK |
150 | { |
151 | struct ieee80211_chanctx_conf *conf = &ctx->conf; | |
152 | struct ieee80211_sub_if_data *sdata; | |
4bf88530 | 153 | const struct cfg80211_chan_def *compat = NULL; |
e89a96f5 MK |
154 | |
155 | lockdep_assert_held(&local->chanctx_mtx); | |
156 | ||
157 | rcu_read_lock(); | |
158 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
4bf88530 | 159 | |
e89a96f5 MK |
160 | if (!ieee80211_sdata_running(sdata)) |
161 | continue; | |
162 | if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf) | |
163 | continue; | |
164 | ||
4bf88530 JB |
165 | if (!compat) |
166 | compat = &sdata->vif.bss_conf.chandef; | |
167 | ||
168 | compat = cfg80211_chandef_compatible( | |
169 | &sdata->vif.bss_conf.chandef, compat); | |
170 | if (!compat) | |
171 | break; | |
e89a96f5 MK |
172 | } |
173 | rcu_read_unlock(); | |
174 | ||
4bf88530 JB |
175 | if (WARN_ON_ONCE(!compat)) |
176 | return; | |
e89a96f5 | 177 | |
18942d3b | 178 | ieee80211_change_chanctx(local, ctx, compat); |
e89a96f5 MK |
179 | } |
180 | ||
d01a1e65 MK |
181 | static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata, |
182 | struct ieee80211_chanctx *ctx) | |
183 | { | |
35f2fce9 | 184 | struct ieee80211_local *local = sdata->local; |
d01a1e65 MK |
185 | |
186 | lockdep_assert_held(&local->chanctx_mtx); | |
187 | ||
188 | ctx->refcount--; | |
189 | rcu_assign_pointer(sdata->vif.chanctx_conf, NULL); | |
35f2fce9 | 190 | |
fd0f979a | 191 | sdata->vif.bss_conf.idle = true; |
5bbe754d JB |
192 | |
193 | if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && | |
194 | sdata->vif.type != NL80211_IFTYPE_MONITOR) | |
195 | ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE); | |
fd0f979a | 196 | |
35f2fce9 | 197 | drv_unassign_vif_chanctx(local, sdata, ctx); |
e89a96f5 | 198 | |
04ecd257 | 199 | if (ctx->refcount > 0) { |
e89a96f5 | 200 | ieee80211_recalc_chanctx_chantype(sdata->local, ctx); |
04ecd257 | 201 | ieee80211_recalc_smps_chanctx(local, ctx); |
164eb02d | 202 | ieee80211_recalc_radar_chanctx(local, ctx); |
04ecd257 | 203 | } |
d01a1e65 MK |
204 | } |
205 | ||
206 | static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) | |
207 | { | |
208 | struct ieee80211_local *local = sdata->local; | |
209 | struct ieee80211_chanctx_conf *conf; | |
210 | struct ieee80211_chanctx *ctx; | |
211 | ||
212 | lockdep_assert_held(&local->chanctx_mtx); | |
213 | ||
214 | conf = rcu_dereference_protected(sdata->vif.chanctx_conf, | |
215 | lockdep_is_held(&local->chanctx_mtx)); | |
216 | if (!conf) | |
217 | return; | |
218 | ||
219 | ctx = container_of(conf, struct ieee80211_chanctx, conf); | |
220 | ||
221 | ieee80211_unassign_vif_chanctx(sdata, ctx); | |
222 | if (ctx->refcount == 0) | |
223 | ieee80211_free_chanctx(local, ctx); | |
224 | } | |
225 | ||
164eb02d SW |
226 | void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local, |
227 | struct ieee80211_chanctx *chanctx) | |
228 | { | |
229 | struct ieee80211_sub_if_data *sdata; | |
230 | bool radar_enabled = false; | |
231 | ||
232 | lockdep_assert_held(&local->chanctx_mtx); | |
233 | ||
234 | rcu_read_lock(); | |
235 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
236 | if (sdata->radar_required) { | |
237 | radar_enabled = true; | |
238 | break; | |
239 | } | |
240 | } | |
241 | rcu_read_unlock(); | |
242 | ||
243 | if (radar_enabled == chanctx->conf.radar_enabled) | |
244 | return; | |
245 | ||
246 | chanctx->conf.radar_enabled = radar_enabled; | |
247 | local->radar_detect_enabled = chanctx->conf.radar_enabled; | |
248 | ||
249 | if (!local->use_chanctx) { | |
250 | local->hw.conf.radar_enabled = chanctx->conf.radar_enabled; | |
251 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
252 | } | |
253 | ||
254 | drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR); | |
255 | } | |
256 | ||
04ecd257 JB |
257 | void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local, |
258 | struct ieee80211_chanctx *chanctx) | |
259 | { | |
260 | struct ieee80211_sub_if_data *sdata; | |
261 | u8 rx_chains_static, rx_chains_dynamic; | |
262 | ||
263 | lockdep_assert_held(&local->chanctx_mtx); | |
264 | ||
265 | rx_chains_static = 1; | |
266 | rx_chains_dynamic = 1; | |
267 | ||
268 | rcu_read_lock(); | |
269 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
270 | u8 needed_static, needed_dynamic; | |
271 | ||
272 | if (!ieee80211_sdata_running(sdata)) | |
273 | continue; | |
274 | ||
275 | if (rcu_access_pointer(sdata->vif.chanctx_conf) != | |
276 | &chanctx->conf) | |
277 | continue; | |
278 | ||
279 | switch (sdata->vif.type) { | |
280 | case NL80211_IFTYPE_P2P_DEVICE: | |
281 | continue; | |
282 | case NL80211_IFTYPE_STATION: | |
283 | if (!sdata->u.mgd.associated) | |
284 | continue; | |
285 | break; | |
286 | case NL80211_IFTYPE_AP_VLAN: | |
287 | continue; | |
288 | case NL80211_IFTYPE_AP: | |
289 | case NL80211_IFTYPE_ADHOC: | |
290 | case NL80211_IFTYPE_WDS: | |
291 | case NL80211_IFTYPE_MESH_POINT: | |
292 | break; | |
293 | default: | |
294 | WARN_ON_ONCE(1); | |
295 | } | |
296 | ||
297 | switch (sdata->smps_mode) { | |
298 | default: | |
299 | WARN_ONCE(1, "Invalid SMPS mode %d\n", | |
300 | sdata->smps_mode); | |
301 | /* fall through */ | |
302 | case IEEE80211_SMPS_OFF: | |
303 | needed_static = sdata->needed_rx_chains; | |
304 | needed_dynamic = sdata->needed_rx_chains; | |
305 | break; | |
306 | case IEEE80211_SMPS_DYNAMIC: | |
307 | needed_static = 1; | |
308 | needed_dynamic = sdata->needed_rx_chains; | |
309 | break; | |
310 | case IEEE80211_SMPS_STATIC: | |
311 | needed_static = 1; | |
312 | needed_dynamic = 1; | |
313 | break; | |
314 | } | |
315 | ||
316 | rx_chains_static = max(rx_chains_static, needed_static); | |
317 | rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic); | |
318 | } | |
319 | rcu_read_unlock(); | |
320 | ||
321 | if (!local->use_chanctx) { | |
322 | if (rx_chains_static > 1) | |
323 | local->smps_mode = IEEE80211_SMPS_OFF; | |
324 | else if (rx_chains_dynamic > 1) | |
325 | local->smps_mode = IEEE80211_SMPS_DYNAMIC; | |
326 | else | |
327 | local->smps_mode = IEEE80211_SMPS_STATIC; | |
328 | ieee80211_hw_config(local, 0); | |
329 | } | |
330 | ||
331 | if (rx_chains_static == chanctx->conf.rx_chains_static && | |
332 | rx_chains_dynamic == chanctx->conf.rx_chains_dynamic) | |
333 | return; | |
334 | ||
335 | chanctx->conf.rx_chains_static = rx_chains_static; | |
336 | chanctx->conf.rx_chains_dynamic = rx_chains_dynamic; | |
337 | drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS); | |
338 | } | |
339 | ||
d01a1e65 | 340 | int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, |
4bf88530 | 341 | const struct cfg80211_chan_def *chandef, |
d01a1e65 MK |
342 | enum ieee80211_chanctx_mode mode) |
343 | { | |
344 | struct ieee80211_local *local = sdata->local; | |
345 | struct ieee80211_chanctx *ctx; | |
346 | int ret; | |
347 | ||
55de908a JB |
348 | WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); |
349 | ||
d01a1e65 MK |
350 | mutex_lock(&local->chanctx_mtx); |
351 | __ieee80211_vif_release_channel(sdata); | |
352 | ||
4bf88530 | 353 | ctx = ieee80211_find_chanctx(local, chandef, mode); |
d01a1e65 | 354 | if (!ctx) |
4bf88530 | 355 | ctx = ieee80211_new_chanctx(local, chandef, mode); |
d01a1e65 MK |
356 | if (IS_ERR(ctx)) { |
357 | ret = PTR_ERR(ctx); | |
358 | goto out; | |
359 | } | |
360 | ||
4bf88530 | 361 | sdata->vif.bss_conf.chandef = *chandef; |
55de908a | 362 | |
d01a1e65 MK |
363 | ret = ieee80211_assign_vif_chanctx(sdata, ctx); |
364 | if (ret) { | |
365 | /* if assign fails refcount stays the same */ | |
366 | if (ctx->refcount == 0) | |
367 | ieee80211_free_chanctx(local, ctx); | |
368 | goto out; | |
369 | } | |
370 | ||
04ecd257 | 371 | ieee80211_recalc_smps_chanctx(local, ctx); |
164eb02d | 372 | ieee80211_recalc_radar_chanctx(local, ctx); |
d01a1e65 MK |
373 | out: |
374 | mutex_unlock(&local->chanctx_mtx); | |
375 | return ret; | |
376 | } | |
377 | ||
2c9b7359 JB |
378 | int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata, |
379 | const struct cfg80211_chan_def *chandef, | |
380 | u32 *changed) | |
381 | { | |
382 | struct ieee80211_local *local = sdata->local; | |
383 | struct ieee80211_chanctx_conf *conf; | |
384 | struct ieee80211_chanctx *ctx; | |
385 | int ret; | |
386 | ||
387 | if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, | |
388 | IEEE80211_CHAN_DISABLED)) | |
389 | return -EINVAL; | |
390 | ||
391 | mutex_lock(&local->chanctx_mtx); | |
392 | if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) { | |
393 | ret = 0; | |
394 | goto out; | |
395 | } | |
396 | ||
397 | if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT || | |
398 | sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) { | |
399 | ret = -EINVAL; | |
400 | goto out; | |
401 | } | |
402 | ||
403 | conf = rcu_dereference_protected(sdata->vif.chanctx_conf, | |
404 | lockdep_is_held(&local->chanctx_mtx)); | |
405 | if (!conf) { | |
406 | ret = -EINVAL; | |
407 | goto out; | |
408 | } | |
409 | ||
410 | ctx = container_of(conf, struct ieee80211_chanctx, conf); | |
411 | if (!cfg80211_chandef_compatible(&conf->def, chandef)) { | |
412 | ret = -EINVAL; | |
413 | goto out; | |
414 | } | |
415 | ||
416 | sdata->vif.bss_conf.chandef = *chandef; | |
417 | ||
418 | ieee80211_recalc_chanctx_chantype(local, ctx); | |
419 | ||
420 | *changed |= BSS_CHANGED_BANDWIDTH; | |
421 | ret = 0; | |
422 | out: | |
423 | mutex_unlock(&local->chanctx_mtx); | |
424 | return ret; | |
425 | } | |
426 | ||
d01a1e65 MK |
427 | void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) |
428 | { | |
55de908a JB |
429 | WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev)); |
430 | ||
d01a1e65 MK |
431 | mutex_lock(&sdata->local->chanctx_mtx); |
432 | __ieee80211_vif_release_channel(sdata); | |
433 | mutex_unlock(&sdata->local->chanctx_mtx); | |
434 | } | |
3448c005 | 435 | |
4d76d21b JB |
436 | void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata) |
437 | { | |
438 | struct ieee80211_local *local = sdata->local; | |
439 | struct ieee80211_sub_if_data *ap; | |
440 | struct ieee80211_chanctx_conf *conf; | |
441 | ||
442 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss)) | |
443 | return; | |
444 | ||
445 | ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); | |
446 | ||
447 | mutex_lock(&local->chanctx_mtx); | |
448 | ||
449 | conf = rcu_dereference_protected(ap->vif.chanctx_conf, | |
450 | lockdep_is_held(&local->chanctx_mtx)); | |
451 | rcu_assign_pointer(sdata->vif.chanctx_conf, conf); | |
452 | mutex_unlock(&local->chanctx_mtx); | |
453 | } | |
454 | ||
1f4ac5a6 JB |
455 | void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, |
456 | bool clear) | |
457 | { | |
458 | struct ieee80211_local *local = sdata->local; | |
459 | struct ieee80211_sub_if_data *vlan; | |
460 | struct ieee80211_chanctx_conf *conf; | |
461 | ||
462 | ASSERT_RTNL(); | |
463 | ||
464 | if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP)) | |
465 | return; | |
466 | ||
467 | mutex_lock(&local->chanctx_mtx); | |
468 | ||
469 | /* | |
470 | * Check that conf exists, even when clearing this function | |
471 | * must be called with the AP's channel context still there | |
472 | * as it would otherwise cause VLANs to have an invalid | |
473 | * channel context pointer for a while, possibly pointing | |
474 | * to a channel context that has already been freed. | |
475 | */ | |
476 | conf = rcu_dereference_protected(sdata->vif.chanctx_conf, | |
477 | lockdep_is_held(&local->chanctx_mtx)); | |
478 | WARN_ON(!conf); | |
479 | ||
480 | if (clear) | |
481 | conf = NULL; | |
482 | ||
483 | list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) | |
484 | rcu_assign_pointer(vlan->vif.chanctx_conf, conf); | |
485 | ||
486 | mutex_unlock(&local->chanctx_mtx); | |
487 | } | |
488 | ||
3448c005 JB |
489 | void ieee80211_iter_chan_contexts_atomic( |
490 | struct ieee80211_hw *hw, | |
491 | void (*iter)(struct ieee80211_hw *hw, | |
492 | struct ieee80211_chanctx_conf *chanctx_conf, | |
493 | void *data), | |
494 | void *iter_data) | |
495 | { | |
496 | struct ieee80211_local *local = hw_to_local(hw); | |
497 | struct ieee80211_chanctx *ctx; | |
498 | ||
499 | rcu_read_lock(); | |
500 | list_for_each_entry_rcu(ctx, &local->chanctx_list, list) | |
8a61af65 JB |
501 | if (ctx->driver_present) |
502 | iter(hw, &ctx->conf, iter_data); | |
3448c005 JB |
503 | rcu_read_unlock(); |
504 | } | |
505 | EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic); |