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Commit | Line | Data |
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e76da505 JD |
1 | /* |
2 | * DFS - Dynamic Frequency Selection | |
3 | * Copyright (c) 2002-2013, Jouni Malinen <j@w1.fi> | |
58b73e3d | 4 | * Copyright (c) 2013, Qualcomm Atheros, Inc. |
e76da505 JD |
5 | * |
6 | * This software may be distributed under the terms of the BSD license. | |
7 | * See README for more details. | |
8 | */ | |
9 | ||
10 | #include "utils/includes.h" | |
11 | ||
12 | #include "utils/common.h" | |
13 | #include "common/ieee802_11_defs.h" | |
186c9059 | 14 | #include "common/wpa_ctrl.h" |
e76da505 | 15 | #include "hostapd.h" |
e76da505 JD |
16 | #include "ap_drv_ops.h" |
17 | #include "drivers/driver.h" | |
18 | #include "dfs.h" | |
19 | ||
20 | ||
dc036d9e | 21 | static int dfs_get_used_n_chans(struct hostapd_iface *iface) |
58b73e3d JD |
22 | { |
23 | int n_chans = 1; | |
24 | ||
dc036d9e | 25 | if (iface->conf->ieee80211n && iface->conf->secondary_channel) |
58b73e3d JD |
26 | n_chans = 2; |
27 | ||
dc036d9e JM |
28 | if (iface->conf->ieee80211ac) { |
29 | switch (iface->conf->vht_oper_chwidth) { | |
58b73e3d JD |
30 | case VHT_CHANWIDTH_USE_HT: |
31 | break; | |
32 | case VHT_CHANWIDTH_80MHZ: | |
33 | n_chans = 4; | |
34 | break; | |
899cc14e JD |
35 | case VHT_CHANWIDTH_160MHZ: |
36 | n_chans = 8; | |
37 | break; | |
58b73e3d JD |
38 | default: |
39 | break; | |
40 | } | |
41 | } | |
42 | ||
43 | return n_chans; | |
44 | } | |
45 | ||
46 | ||
b72f949b MK |
47 | static int dfs_channel_available(struct hostapd_channel_data *chan, |
48 | int skip_radar) | |
58b73e3d | 49 | { |
b72f949b MK |
50 | /* |
51 | * When radar detection happens, CSA is performed. However, there's no | |
52 | * time for CAC, so radar channels must be skipped when finding a new | |
53 | * channel for CSA. | |
54 | */ | |
55 | if (skip_radar && chan->flag & HOSTAPD_CHAN_RADAR) | |
56 | return 0; | |
57 | ||
58b73e3d JD |
58 | if (chan->flag & HOSTAPD_CHAN_DISABLED) |
59 | return 0; | |
60 | if ((chan->flag & HOSTAPD_CHAN_RADAR) && | |
61 | ((chan->flag & HOSTAPD_CHAN_DFS_MASK) == | |
62 | HOSTAPD_CHAN_DFS_UNAVAILABLE)) | |
63 | return 0; | |
64 | return 1; | |
65 | } | |
66 | ||
67 | ||
1dc17db3 | 68 | static int dfs_is_chan_allowed(struct hostapd_channel_data *chan, int n_chans) |
58b73e3d | 69 | { |
1dc17db3 JD |
70 | /* |
71 | * The tables contain first valid channel number based on channel width. | |
72 | * We will also choose this first channel as the control one. | |
73 | */ | |
74 | int allowed_40[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157, | |
75 | 184, 192 }; | |
76 | /* | |
77 | * VHT80, valid channels based on center frequency: | |
78 | * 42, 58, 106, 122, 138, 155 | |
79 | */ | |
80 | int allowed_80[] = { 36, 52, 100, 116, 132, 149 }; | |
81 | int *allowed = allowed_40; | |
82 | unsigned int i, allowed_no = 0; | |
83 | ||
84 | switch (n_chans) { | |
85 | case 2: | |
86 | allowed = allowed_40; | |
e7ecab4a | 87 | allowed_no = ARRAY_SIZE(allowed_40); |
1dc17db3 JD |
88 | break; |
89 | case 4: | |
90 | allowed = allowed_80; | |
e7ecab4a | 91 | allowed_no = ARRAY_SIZE(allowed_80); |
1dc17db3 JD |
92 | break; |
93 | default: | |
94 | wpa_printf(MSG_DEBUG, "Unknown width for %d channels", n_chans); | |
95 | break; | |
96 | } | |
58b73e3d | 97 | |
1dc17db3 | 98 | for (i = 0; i < allowed_no; i++) { |
58b73e3d JD |
99 | if (chan->chan == allowed[i]) |
100 | return 1; | |
101 | } | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | ||
6a398ddc | 107 | static int dfs_chan_range_available(struct hostapd_hw_modes *mode, |
b72f949b MK |
108 | int first_chan_idx, int num_chans, |
109 | int skip_radar) | |
6a398ddc MK |
110 | { |
111 | struct hostapd_channel_data *first_chan, *chan; | |
112 | int i; | |
113 | ||
114 | if (first_chan_idx + num_chans >= mode->num_channels) | |
115 | return 0; | |
116 | ||
117 | first_chan = &mode->channels[first_chan_idx]; | |
118 | ||
119 | for (i = 0; i < num_chans; i++) { | |
120 | chan = &mode->channels[first_chan_idx + i]; | |
121 | ||
122 | if (first_chan->freq + i * 20 != chan->freq) | |
123 | return 0; | |
124 | ||
b72f949b | 125 | if (!dfs_channel_available(chan, skip_radar)) |
6a398ddc MK |
126 | return 0; |
127 | } | |
128 | ||
129 | return 1; | |
130 | } | |
131 | ||
132 | ||
32595da6 MK |
133 | /* |
134 | * The function assumes HT40+ operation. | |
135 | * Make sure to adjust the following variables after calling this: | |
136 | * - hapd->secondary_channel | |
137 | * - hapd->vht_oper_centr_freq_seg0_idx | |
138 | * - hapd->vht_oper_centr_freq_seg1_idx | |
139 | */ | |
dc036d9e | 140 | static int dfs_find_channel(struct hostapd_iface *iface, |
6de0e0c9 | 141 | struct hostapd_channel_data **ret_chan, |
b72f949b | 142 | int idx, int skip_radar) |
e76da505 JD |
143 | { |
144 | struct hostapd_hw_modes *mode; | |
6a398ddc MK |
145 | struct hostapd_channel_data *chan; |
146 | int i, channel_idx = 0, n_chans; | |
e76da505 | 147 | |
dc036d9e JM |
148 | mode = iface->current_mode; |
149 | n_chans = dfs_get_used_n_chans(iface); | |
e76da505 | 150 | |
58b73e3d | 151 | wpa_printf(MSG_DEBUG, "DFS new chan checking %d channels", n_chans); |
e76da505 JD |
152 | for (i = 0; i < mode->num_channels; i++) { |
153 | chan = &mode->channels[i]; | |
154 | ||
6a398ddc | 155 | /* Skip HT40/VHT incompatible channels */ |
dc036d9e JM |
156 | if (iface->conf->ieee80211n && |
157 | iface->conf->secondary_channel && | |
6a398ddc | 158 | !dfs_is_chan_allowed(chan, n_chans)) |
e76da505 JD |
159 | continue; |
160 | ||
6a398ddc | 161 | /* Skip incompatible chandefs */ |
b72f949b | 162 | if (!dfs_chan_range_available(mode, i, n_chans, skip_radar)) |
6a398ddc | 163 | continue; |
e76da505 JD |
164 | |
165 | if (ret_chan && idx == channel_idx) { | |
166 | wpa_printf(MSG_DEBUG, "Selected ch. #%d", chan->chan); | |
167 | *ret_chan = chan; | |
168 | return idx; | |
169 | } | |
58b73e3d | 170 | wpa_printf(MSG_DEBUG, "Adding channel: %d", chan->chan); |
e76da505 JD |
171 | channel_idx++; |
172 | } | |
173 | return channel_idx; | |
174 | } | |
175 | ||
176 | ||
dc036d9e | 177 | static void dfs_adjust_vht_center_freq(struct hostapd_iface *iface, |
32595da6 MK |
178 | struct hostapd_channel_data *chan, |
179 | u8 *vht_oper_centr_freq_seg0_idx, | |
180 | u8 *vht_oper_centr_freq_seg1_idx) | |
58b73e3d | 181 | { |
dc036d9e | 182 | if (!iface->conf->ieee80211ac) |
58b73e3d JD |
183 | return; |
184 | ||
185 | if (!chan) | |
186 | return; | |
187 | ||
32595da6 MK |
188 | *vht_oper_centr_freq_seg1_idx = 0; |
189 | ||
dc036d9e | 190 | switch (iface->conf->vht_oper_chwidth) { |
58b73e3d | 191 | case VHT_CHANWIDTH_USE_HT: |
dc036d9e | 192 | if (iface->conf->secondary_channel == 1) |
32595da6 | 193 | *vht_oper_centr_freq_seg0_idx = chan->chan + 2; |
dc036d9e | 194 | else if (iface->conf->secondary_channel == -1) |
32595da6 | 195 | *vht_oper_centr_freq_seg0_idx = chan->chan - 2; |
345276a6 | 196 | else |
32595da6 | 197 | *vht_oper_centr_freq_seg0_idx = chan->chan; |
58b73e3d JD |
198 | break; |
199 | case VHT_CHANWIDTH_80MHZ: | |
32595da6 | 200 | *vht_oper_centr_freq_seg0_idx = chan->chan + 6; |
58b73e3d | 201 | break; |
899cc14e | 202 | case VHT_CHANWIDTH_160MHZ: |
32595da6 | 203 | *vht_oper_centr_freq_seg0_idx = chan->chan + 14; |
35f83637 | 204 | break; |
58b73e3d | 205 | default: |
899cc14e | 206 | wpa_printf(MSG_INFO, "DFS only VHT20/40/80/160 is supported now"); |
58b73e3d JD |
207 | break; |
208 | } | |
209 | ||
32595da6 MK |
210 | wpa_printf(MSG_DEBUG, "DFS adjusting VHT center frequency: %d, %d", |
211 | *vht_oper_centr_freq_seg0_idx, | |
212 | *vht_oper_centr_freq_seg1_idx); | |
58b73e3d JD |
213 | } |
214 | ||
215 | ||
216 | /* Return start channel idx we will use for mode->channels[idx] */ | |
dc036d9e | 217 | static int dfs_get_start_chan_idx(struct hostapd_iface *iface) |
58b73e3d JD |
218 | { |
219 | struct hostapd_hw_modes *mode; | |
220 | struct hostapd_channel_data *chan; | |
dc036d9e | 221 | int channel_no = iface->conf->channel; |
58b73e3d JD |
222 | int res = -1, i; |
223 | ||
224 | /* HT40- */ | |
dc036d9e | 225 | if (iface->conf->ieee80211n && iface->conf->secondary_channel == -1) |
58b73e3d JD |
226 | channel_no -= 4; |
227 | ||
228 | /* VHT */ | |
dc036d9e JM |
229 | if (iface->conf->ieee80211ac) { |
230 | switch (iface->conf->vht_oper_chwidth) { | |
58b73e3d JD |
231 | case VHT_CHANWIDTH_USE_HT: |
232 | break; | |
233 | case VHT_CHANWIDTH_80MHZ: | |
234 | channel_no = | |
dc036d9e | 235 | iface->conf->vht_oper_centr_freq_seg0_idx - 6; |
58b73e3d | 236 | break; |
899cc14e JD |
237 | case VHT_CHANWIDTH_160MHZ: |
238 | channel_no = | |
dc036d9e | 239 | iface->conf->vht_oper_centr_freq_seg0_idx - 14; |
899cc14e | 240 | break; |
58b73e3d JD |
241 | default: |
242 | wpa_printf(MSG_INFO, | |
899cc14e | 243 | "DFS only VHT20/40/80/160 is supported now"); |
58b73e3d JD |
244 | channel_no = -1; |
245 | break; | |
246 | } | |
247 | } | |
248 | ||
249 | /* Get idx */ | |
dc036d9e | 250 | mode = iface->current_mode; |
58b73e3d JD |
251 | for (i = 0; i < mode->num_channels; i++) { |
252 | chan = &mode->channels[i]; | |
253 | if (chan->chan == channel_no) { | |
254 | res = i; | |
255 | break; | |
256 | } | |
257 | } | |
258 | ||
259 | if (res == -1) | |
260 | wpa_printf(MSG_DEBUG, "DFS chan_idx seems wrong: -1"); | |
261 | ||
262 | return res; | |
263 | } | |
264 | ||
265 | ||
266 | /* At least one channel have radar flag */ | |
dc036d9e JM |
267 | static int dfs_check_chans_radar(struct hostapd_iface *iface, |
268 | int start_chan_idx, int n_chans) | |
58b73e3d JD |
269 | { |
270 | struct hostapd_channel_data *channel; | |
271 | struct hostapd_hw_modes *mode; | |
272 | int i, res = 0; | |
273 | ||
dc036d9e | 274 | mode = iface->current_mode; |
58b73e3d JD |
275 | |
276 | for (i = 0; i < n_chans; i++) { | |
277 | channel = &mode->channels[start_chan_idx + i]; | |
278 | if (channel->flag & HOSTAPD_CHAN_RADAR) | |
279 | res++; | |
280 | } | |
281 | ||
282 | return res; | |
283 | } | |
284 | ||
285 | ||
286 | /* All channels available */ | |
dc036d9e | 287 | static int dfs_check_chans_available(struct hostapd_iface *iface, |
58b73e3d JD |
288 | int start_chan_idx, int n_chans) |
289 | { | |
290 | struct hostapd_channel_data *channel; | |
291 | struct hostapd_hw_modes *mode; | |
292 | int i; | |
293 | ||
dc036d9e | 294 | mode = iface->current_mode; |
58b73e3d JD |
295 | |
296 | for(i = 0; i < n_chans; i++) { | |
297 | channel = &mode->channels[start_chan_idx + i]; | |
298 | if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) != | |
299 | HOSTAPD_CHAN_DFS_AVAILABLE) | |
300 | break; | |
301 | } | |
302 | ||
303 | return i == n_chans; | |
304 | } | |
305 | ||
306 | ||
307 | /* At least one channel unavailable */ | |
dc036d9e | 308 | static int dfs_check_chans_unavailable(struct hostapd_iface *iface, |
58b73e3d JD |
309 | int start_chan_idx, |
310 | int n_chans) | |
311 | { | |
312 | struct hostapd_channel_data *channel; | |
313 | struct hostapd_hw_modes *mode; | |
314 | int i, res = 0; | |
315 | ||
dc036d9e | 316 | mode = iface->current_mode; |
58b73e3d JD |
317 | |
318 | for(i = 0; i < n_chans; i++) { | |
319 | channel = &mode->channels[start_chan_idx + i]; | |
320 | if (channel->flag & HOSTAPD_CHAN_DISABLED) | |
321 | res++; | |
322 | if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) == | |
323 | HOSTAPD_CHAN_DFS_UNAVAILABLE) | |
324 | res++; | |
325 | } | |
326 | ||
327 | return res; | |
328 | } | |
329 | ||
330 | ||
32595da6 | 331 | static struct hostapd_channel_data * |
dc036d9e | 332 | dfs_get_valid_channel(struct hostapd_iface *iface, |
32595da6 MK |
333 | int *secondary_channel, |
334 | u8 *vht_oper_centr_freq_seg0_idx, | |
b72f949b MK |
335 | u8 *vht_oper_centr_freq_seg1_idx, |
336 | int skip_radar) | |
e76da505 JD |
337 | { |
338 | struct hostapd_hw_modes *mode; | |
339 | struct hostapd_channel_data *chan = NULL; | |
32595da6 MK |
340 | int num_available_chandefs; |
341 | int chan_idx; | |
e76da505 JD |
342 | u32 _rand; |
343 | ||
344 | wpa_printf(MSG_DEBUG, "DFS: Selecting random channel"); | |
345 | ||
dc036d9e | 346 | if (iface->current_mode == NULL) |
e76da505 JD |
347 | return NULL; |
348 | ||
dc036d9e | 349 | mode = iface->current_mode; |
e76da505 JD |
350 | if (mode->mode != HOSTAPD_MODE_IEEE80211A) |
351 | return NULL; | |
352 | ||
32595da6 | 353 | /* Get the count first */ |
b72f949b | 354 | num_available_chandefs = dfs_find_channel(iface, NULL, 0, skip_radar); |
32595da6 MK |
355 | if (num_available_chandefs == 0) |
356 | return NULL; | |
e76da505 | 357 | |
32595da6 MK |
358 | os_get_random((u8 *) &_rand, sizeof(_rand)); |
359 | chan_idx = _rand % num_available_chandefs; | |
b72f949b | 360 | dfs_find_channel(iface, &chan, chan_idx, skip_radar); |
32595da6 MK |
361 | |
362 | /* dfs_find_channel() calculations assume HT40+ */ | |
dc036d9e | 363 | if (iface->conf->secondary_channel) |
32595da6 MK |
364 | *secondary_channel = 1; |
365 | else | |
366 | *secondary_channel = 0; | |
367 | ||
dc036d9e | 368 | dfs_adjust_vht_center_freq(iface, chan, |
32595da6 MK |
369 | vht_oper_centr_freq_seg0_idx, |
370 | vht_oper_centr_freq_seg1_idx); | |
58b73e3d | 371 | |
e76da505 JD |
372 | return chan; |
373 | } | |
374 | ||
375 | ||
dc036d9e | 376 | static int set_dfs_state_freq(struct hostapd_iface *iface, int freq, u32 state) |
e76da505 JD |
377 | { |
378 | struct hostapd_hw_modes *mode; | |
379 | struct hostapd_channel_data *chan = NULL; | |
380 | int i; | |
381 | ||
dc036d9e | 382 | mode = iface->current_mode; |
e76da505 JD |
383 | if (mode == NULL) |
384 | return 0; | |
385 | ||
58b73e3d | 386 | wpa_printf(MSG_DEBUG, "set_dfs_state 0x%X for %d MHz", state, freq); |
dc036d9e JM |
387 | for (i = 0; i < iface->current_mode->num_channels; i++) { |
388 | chan = &iface->current_mode->channels[i]; | |
e76da505 JD |
389 | if (chan->freq == freq) { |
390 | if (chan->flag & HOSTAPD_CHAN_RADAR) { | |
391 | chan->flag &= ~HOSTAPD_CHAN_DFS_MASK; | |
392 | chan->flag |= state; | |
393 | return 1; /* Channel found */ | |
394 | } | |
395 | } | |
396 | } | |
397 | wpa_printf(MSG_WARNING, "Can't set DFS state for freq %d MHz", freq); | |
398 | return 0; | |
399 | } | |
400 | ||
401 | ||
dc036d9e | 402 | static int set_dfs_state(struct hostapd_iface *iface, int freq, int ht_enabled, |
58b73e3d JD |
403 | int chan_offset, int chan_width, int cf1, |
404 | int cf2, u32 state) | |
405 | { | |
406 | int n_chans = 1, i; | |
407 | struct hostapd_hw_modes *mode; | |
408 | int frequency = freq; | |
409 | int ret = 0; | |
410 | ||
dc036d9e | 411 | mode = iface->current_mode; |
58b73e3d JD |
412 | if (mode == NULL) |
413 | return 0; | |
414 | ||
415 | if (mode->mode != HOSTAPD_MODE_IEEE80211A) { | |
416 | wpa_printf(MSG_WARNING, "current_mode != IEEE80211A"); | |
417 | return 0; | |
418 | } | |
419 | ||
420 | /* Seems cf1 and chan_width is enough here */ | |
421 | switch (chan_width) { | |
422 | case CHAN_WIDTH_20_NOHT: | |
423 | case CHAN_WIDTH_20: | |
424 | n_chans = 1; | |
bb337dda JM |
425 | if (frequency == 0) |
426 | frequency = cf1; | |
58b73e3d JD |
427 | break; |
428 | case CHAN_WIDTH_40: | |
429 | n_chans = 2; | |
430 | frequency = cf1 - 10; | |
431 | break; | |
432 | case CHAN_WIDTH_80: | |
433 | n_chans = 4; | |
434 | frequency = cf1 - 30; | |
435 | break; | |
899cc14e JD |
436 | case CHAN_WIDTH_160: |
437 | n_chans = 8; | |
438 | frequency = cf1 - 70; | |
439 | break; | |
58b73e3d JD |
440 | default: |
441 | wpa_printf(MSG_INFO, "DFS chan_width %d not supported", | |
442 | chan_width); | |
443 | break; | |
444 | } | |
445 | ||
446 | wpa_printf(MSG_DEBUG, "DFS freq: %dMHz, n_chans: %d", frequency, | |
447 | n_chans); | |
448 | for (i = 0; i < n_chans; i++) { | |
dc036d9e | 449 | ret += set_dfs_state_freq(iface, frequency, state); |
58b73e3d JD |
450 | frequency = frequency + 20; |
451 | } | |
452 | ||
453 | return ret; | |
454 | } | |
455 | ||
456 | ||
dc036d9e | 457 | static int dfs_are_channels_overlapped(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
458 | int chan_width, int cf1, int cf2) |
459 | { | |
460 | int start_chan_idx; | |
461 | struct hostapd_hw_modes *mode; | |
462 | struct hostapd_channel_data *chan; | |
463 | int n_chans, i, j, frequency = freq, radar_n_chans = 1; | |
464 | u8 radar_chan; | |
465 | int res = 0; | |
466 | ||
58b73e3d | 467 | /* Our configuration */ |
dc036d9e JM |
468 | mode = iface->current_mode; |
469 | start_chan_idx = dfs_get_start_chan_idx(iface); | |
470 | n_chans = dfs_get_used_n_chans(iface); | |
58b73e3d | 471 | |
5eaf240a | 472 | /* Check we are on DFS channel(s) */ |
dc036d9e | 473 | if (!dfs_check_chans_radar(iface, start_chan_idx, n_chans)) |
5eaf240a JD |
474 | return 0; |
475 | ||
58b73e3d JD |
476 | /* Reported via radar event */ |
477 | switch (chan_width) { | |
478 | case CHAN_WIDTH_20_NOHT: | |
479 | case CHAN_WIDTH_20: | |
480 | radar_n_chans = 1; | |
bb337dda JM |
481 | if (frequency == 0) |
482 | frequency = cf1; | |
58b73e3d JD |
483 | break; |
484 | case CHAN_WIDTH_40: | |
485 | radar_n_chans = 2; | |
486 | frequency = cf1 - 10; | |
487 | break; | |
488 | case CHAN_WIDTH_80: | |
489 | radar_n_chans = 4; | |
490 | frequency = cf1 - 30; | |
491 | break; | |
899cc14e JD |
492 | case CHAN_WIDTH_160: |
493 | radar_n_chans = 8; | |
494 | frequency = cf1 - 70; | |
495 | break; | |
58b73e3d JD |
496 | default: |
497 | wpa_printf(MSG_INFO, "DFS chan_width %d not supported", | |
498 | chan_width); | |
499 | break; | |
500 | } | |
501 | ||
502 | ieee80211_freq_to_chan(frequency, &radar_chan); | |
503 | ||
504 | for (i = 0; i < n_chans; i++) { | |
505 | chan = &mode->channels[start_chan_idx + i]; | |
5eaf240a JD |
506 | if (!(chan->flag & HOSTAPD_CHAN_RADAR)) |
507 | continue; | |
58b73e3d JD |
508 | for (j = 0; j < radar_n_chans; j++) { |
509 | wpa_printf(MSG_DEBUG, "checking our: %d, radar: %d", | |
510 | chan->chan, radar_chan + j * 4); | |
511 | if (chan->chan == radar_chan + j * 4) | |
512 | res++; | |
513 | } | |
514 | } | |
515 | ||
516 | wpa_printf(MSG_DEBUG, "overlapped: %d", res); | |
517 | ||
518 | return res; | |
519 | } | |
520 | ||
521 | ||
e76da505 JD |
522 | /* |
523 | * Main DFS handler | |
524 | * 1 - continue channel/ap setup | |
525 | * 0 - channel/ap setup will be continued after CAC | |
526 | * -1 - hit critical error | |
527 | */ | |
dc036d9e | 528 | int hostapd_handle_dfs(struct hostapd_iface *iface) |
e76da505 | 529 | { |
e76da505 | 530 | struct hostapd_channel_data *channel; |
58b73e3d | 531 | int res, n_chans, start_chan_idx; |
b72f949b | 532 | int skip_radar = 0; |
58b73e3d | 533 | |
dc036d9e | 534 | iface->cac_started = 0; |
954e71d2 | 535 | |
58b73e3d JD |
536 | do { |
537 | /* Get start (first) channel for current configuration */ | |
dc036d9e | 538 | start_chan_idx = dfs_get_start_chan_idx(iface); |
58b73e3d JD |
539 | if (start_chan_idx == -1) |
540 | return -1; | |
541 | ||
542 | /* Get number of used channels, depend on width */ | |
dc036d9e | 543 | n_chans = dfs_get_used_n_chans(iface); |
58b73e3d JD |
544 | |
545 | /* Check if any of configured channels require DFS */ | |
dc036d9e | 546 | res = dfs_check_chans_radar(iface, start_chan_idx, n_chans); |
58b73e3d JD |
547 | wpa_printf(MSG_DEBUG, |
548 | "DFS %d channels required radar detection", | |
549 | res); | |
550 | if (!res) | |
551 | return 1; | |
552 | ||
553 | /* Check if all channels are DFS available */ | |
dc036d9e | 554 | res = dfs_check_chans_available(iface, start_chan_idx, n_chans); |
58b73e3d JD |
555 | wpa_printf(MSG_DEBUG, |
556 | "DFS all channels available, (SKIP CAC): %s", | |
557 | res ? "yes" : "no"); | |
558 | if (res) | |
559 | return 1; | |
560 | ||
561 | /* Check if any of configured channels is unavailable */ | |
dc036d9e | 562 | res = dfs_check_chans_unavailable(iface, start_chan_idx, |
58b73e3d JD |
563 | n_chans); |
564 | wpa_printf(MSG_DEBUG, "DFS %d chans unavailable - choose other channel: %s", | |
565 | res, res ? "yes": "no"); | |
566 | if (res) { | |
32595da6 MK |
567 | int sec; |
568 | u8 cf1, cf2; | |
569 | ||
b72f949b MK |
570 | channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2, |
571 | skip_radar); | |
e76da505 JD |
572 | if (!channel) { |
573 | wpa_printf(MSG_ERROR, "could not get valid channel"); | |
574 | return -1; | |
575 | } | |
32595da6 | 576 | |
dc036d9e JM |
577 | iface->freq = channel->freq; |
578 | iface->conf->channel = channel->chan; | |
579 | iface->conf->secondary_channel = sec; | |
580 | iface->conf->vht_oper_centr_freq_seg0_idx = cf1; | |
581 | iface->conf->vht_oper_centr_freq_seg1_idx = cf2; | |
e76da505 | 582 | } |
58b73e3d JD |
583 | } while (res); |
584 | ||
585 | /* Finally start CAC */ | |
dc036d9e JM |
586 | hostapd_set_state(iface, HAPD_IFACE_DFS); |
587 | wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz", iface->freq); | |
588 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START | |
186c9059 | 589 | "freq=%d chan=%d sec_chan=%d", |
dc036d9e JM |
590 | iface->freq, |
591 | iface->conf->channel, iface->conf->secondary_channel); | |
592 | if (hostapd_start_dfs_cac(iface, iface->conf->hw_mode, | |
593 | iface->freq, | |
594 | iface->conf->channel, | |
595 | iface->conf->ieee80211n, | |
596 | iface->conf->ieee80211ac, | |
597 | iface->conf->secondary_channel, | |
598 | iface->conf->vht_oper_chwidth, | |
599 | iface->conf->vht_oper_centr_freq_seg0_idx, | |
600 | iface->conf->vht_oper_centr_freq_seg1_idx)) { | |
58b73e3d JD |
601 | wpa_printf(MSG_DEBUG, "DFS start_dfs_cac() failed"); |
602 | return -1; | |
e76da505 JD |
603 | } |
604 | ||
58b73e3d | 605 | return 0; |
e76da505 JD |
606 | } |
607 | ||
608 | ||
dc036d9e | 609 | int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq, |
58b73e3d JD |
610 | int ht_enabled, int chan_offset, int chan_width, |
611 | int cf1, int cf2) | |
e76da505 | 612 | { |
dc036d9e | 613 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_COMPLETED |
186c9059 JM |
614 | "success=%d freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
615 | success, freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
616 | ||
e76da505 JD |
617 | if (success) { |
618 | /* Complete iface/ap configuration */ | |
dc036d9e | 619 | set_dfs_state(iface, freq, ht_enabled, chan_offset, |
58b73e3d JD |
620 | chan_width, cf1, cf2, |
621 | HOSTAPD_CHAN_DFS_AVAILABLE); | |
dc036d9e JM |
622 | iface->cac_started = 0; |
623 | hostapd_setup_interface_complete(iface, 0); | |
e76da505 JD |
624 | } |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
629 | ||
f7154cee | 630 | static int hostapd_dfs_start_channel_switch_cac(struct hostapd_iface *iface) |
e76da505 JD |
631 | { |
632 | struct hostapd_channel_data *channel; | |
f7154cee JD |
633 | int secondary_channel; |
634 | u8 vht_oper_centr_freq_seg0_idx; | |
635 | u8 vht_oper_centr_freq_seg1_idx; | |
636 | int skip_radar = 0; | |
e76da505 | 637 | int err = 1; |
f7154cee JD |
638 | |
639 | /* Radar detected during active CAC */ | |
640 | iface->cac_started = 0; | |
641 | channel = dfs_get_valid_channel(iface, &secondary_channel, | |
642 | &vht_oper_centr_freq_seg0_idx, | |
643 | &vht_oper_centr_freq_seg1_idx, | |
644 | skip_radar); | |
645 | ||
646 | if (!channel) { | |
647 | wpa_printf(MSG_ERROR, "No valid channel available"); | |
648 | hostapd_setup_interface_complete(iface, err); | |
649 | return err; | |
650 | } | |
651 | ||
652 | wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d", | |
653 | channel->chan); | |
654 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL | |
655 | "freq=%d chan=%d sec_chan=%d", channel->freq, | |
656 | channel->chan, secondary_channel); | |
657 | ||
658 | iface->freq = channel->freq; | |
659 | iface->conf->channel = channel->chan; | |
660 | iface->conf->secondary_channel = secondary_channel; | |
661 | iface->conf->vht_oper_centr_freq_seg0_idx = | |
662 | vht_oper_centr_freq_seg0_idx; | |
663 | iface->conf->vht_oper_centr_freq_seg1_idx = | |
664 | vht_oper_centr_freq_seg1_idx; | |
665 | err = 0; | |
666 | ||
667 | hostapd_setup_interface_complete(iface, err); | |
668 | return err; | |
669 | } | |
670 | ||
671 | ||
672 | static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface) | |
673 | { | |
674 | struct hostapd_channel_data *channel; | |
32595da6 MK |
675 | int secondary_channel; |
676 | u8 vht_oper_centr_freq_seg0_idx; | |
677 | u8 vht_oper_centr_freq_seg1_idx; | |
b72f949b | 678 | int skip_radar = 1; |
f7154cee JD |
679 | struct csa_settings csa_settings; |
680 | struct hostapd_data *hapd = iface->bss[0]; | |
681 | int err = 1; | |
682 | ||
683 | wpa_printf(MSG_DEBUG, "%s called (CAC active: %s)", __func__, | |
684 | iface->cac_started ? "yes" : "no"); | |
685 | ||
686 | /* Check if active CAC */ | |
687 | if (iface->cac_started) | |
688 | return hostapd_dfs_start_channel_switch_cac(iface); | |
e76da505 | 689 | |
f7154cee JD |
690 | |
691 | /* Perform channel switch/CSA */ | |
dc036d9e | 692 | channel = dfs_get_valid_channel(iface, &secondary_channel, |
32595da6 | 693 | &vht_oper_centr_freq_seg0_idx, |
b72f949b MK |
694 | &vht_oper_centr_freq_seg1_idx, |
695 | skip_radar); | |
813d4bac | 696 | |
f7154cee JD |
697 | if (!channel) { |
698 | /* FIXME: Wait for channel(s) to become available */ | |
699 | hostapd_disable_iface(iface); | |
700 | return err; | |
701 | } | |
702 | ||
703 | wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d", | |
704 | channel->chan); | |
705 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL | |
706 | "freq=%d chan=%d sec_chan=%d", channel->freq, | |
707 | channel->chan, secondary_channel); | |
708 | ||
709 | /* Setup CSA request */ | |
710 | os_memset(&csa_settings, 0, sizeof(csa_settings)); | |
711 | csa_settings.cs_count = 5; | |
712 | csa_settings.block_tx = 1; | |
713 | err = hostapd_set_freq_params(&csa_settings.freq_params, | |
714 | iface->conf->hw_mode, | |
715 | channel->freq, | |
716 | channel->chan, | |
717 | iface->conf->ieee80211n, | |
718 | iface->conf->ieee80211ac, | |
719 | secondary_channel, | |
720 | iface->conf->vht_oper_chwidth, | |
721 | vht_oper_centr_freq_seg0_idx, | |
722 | vht_oper_centr_freq_seg1_idx, | |
723 | iface->current_mode->vht_capab); | |
724 | ||
725 | if (err) { | |
726 | wpa_printf(MSG_ERROR, "DFS failed to calculate CSA freq params"); | |
727 | hostapd_disable_iface(iface); | |
728 | return err; | |
729 | } | |
730 | ||
731 | err = hostapd_switch_channel(hapd, &csa_settings); | |
732 | if (err) { | |
733 | wpa_printf(MSG_WARNING, "DFS failed to schedule CSA (%d) - trying fallback", | |
734 | err); | |
dc036d9e JM |
735 | iface->freq = channel->freq; |
736 | iface->conf->channel = channel->chan; | |
737 | iface->conf->secondary_channel = secondary_channel; | |
738 | iface->conf->vht_oper_centr_freq_seg0_idx = | |
739 | vht_oper_centr_freq_seg0_idx; | |
740 | iface->conf->vht_oper_centr_freq_seg1_idx = | |
741 | vht_oper_centr_freq_seg1_idx; | |
813d4bac | 742 | |
dc036d9e | 743 | hostapd_disable_iface(iface); |
f7154cee JD |
744 | hostapd_enable_iface(iface); |
745 | return 0; | |
2e946249 | 746 | } |
e76da505 | 747 | |
f7154cee JD |
748 | /* Channel configuration will be updated once CSA completes and |
749 | * ch_switch_notify event is received */ | |
750 | ||
751 | wpa_printf(MSG_DEBUG, "DFS waiting channel switch event"); | |
e76da505 JD |
752 | return 0; |
753 | } | |
58b73e3d JD |
754 | |
755 | ||
dc036d9e | 756 | int hostapd_dfs_radar_detected(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
757 | int ht_enabled, int chan_offset, int chan_width, |
758 | int cf1, int cf2) | |
759 | { | |
760 | int res; | |
761 | ||
dc036d9e | 762 | if (!iface->conf->ieee80211h) |
58b73e3d JD |
763 | return 0; |
764 | ||
dc036d9e | 765 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_RADAR_DETECTED |
186c9059 JM |
766 | "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
767 | freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
768 | ||
58b73e3d | 769 | /* mark radar frequency as invalid */ |
dc036d9e | 770 | res = set_dfs_state(iface, freq, ht_enabled, chan_offset, |
58b73e3d JD |
771 | chan_width, cf1, cf2, |
772 | HOSTAPD_CHAN_DFS_UNAVAILABLE); | |
773 | ||
774 | /* Skip if reported radar event not overlapped our channels */ | |
dc036d9e | 775 | res = dfs_are_channels_overlapped(iface, freq, chan_width, cf1, cf2); |
58b73e3d JD |
776 | if (!res) |
777 | return 0; | |
778 | ||
58b73e3d | 779 | /* radar detected while operating, switch the channel. */ |
dc036d9e | 780 | res = hostapd_dfs_start_channel_switch(iface); |
58b73e3d JD |
781 | |
782 | return res; | |
783 | } | |
784 | ||
785 | ||
dc036d9e | 786 | int hostapd_dfs_nop_finished(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
787 | int ht_enabled, int chan_offset, int chan_width, |
788 | int cf1, int cf2) | |
789 | { | |
dc036d9e | 790 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NOP_FINISHED |
186c9059 JM |
791 | "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
792 | freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
58b73e3d | 793 | /* TODO add correct implementation here */ |
dc036d9e JM |
794 | set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width, |
795 | cf1, cf2, HOSTAPD_CHAN_DFS_USABLE); | |
58b73e3d JD |
796 | return 0; |
797 | } |