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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> | |
c13578c3 | 4 | * Copyright (c) 2013-2015, 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" | |
ada157f3 | 14 | #include "common/hw_features_common.h" |
186c9059 | 15 | #include "common/wpa_ctrl.h" |
e76da505 | 16 | #include "hostapd.h" |
e76da505 JD |
17 | #include "ap_drv_ops.h" |
18 | #include "drivers/driver.h" | |
19 | #include "dfs.h" | |
20 | ||
21 | ||
4a274f48 | 22 | static int dfs_get_used_n_chans(struct hostapd_iface *iface, int *seg1) |
58b73e3d JD |
23 | { |
24 | int n_chans = 1; | |
25 | ||
4a274f48 JM |
26 | *seg1 = 0; |
27 | ||
dc036d9e | 28 | if (iface->conf->ieee80211n && iface->conf->secondary_channel) |
58b73e3d JD |
29 | n_chans = 2; |
30 | ||
dc036d9e JM |
31 | if (iface->conf->ieee80211ac) { |
32 | switch (iface->conf->vht_oper_chwidth) { | |
58b73e3d JD |
33 | case VHT_CHANWIDTH_USE_HT: |
34 | break; | |
35 | case VHT_CHANWIDTH_80MHZ: | |
36 | n_chans = 4; | |
37 | break; | |
899cc14e JD |
38 | case VHT_CHANWIDTH_160MHZ: |
39 | n_chans = 8; | |
40 | break; | |
4a274f48 JM |
41 | case VHT_CHANWIDTH_80P80MHZ: |
42 | n_chans = 4; | |
43 | *seg1 = 4; | |
44 | break; | |
58b73e3d JD |
45 | default: |
46 | break; | |
47 | } | |
48 | } | |
49 | ||
50 | return n_chans; | |
51 | } | |
52 | ||
53 | ||
b72f949b MK |
54 | static int dfs_channel_available(struct hostapd_channel_data *chan, |
55 | int skip_radar) | |
58b73e3d | 56 | { |
b72f949b MK |
57 | /* |
58 | * When radar detection happens, CSA is performed. However, there's no | |
59 | * time for CAC, so radar channels must be skipped when finding a new | |
01b99998 | 60 | * channel for CSA, unless they are available for immediate use. |
b72f949b | 61 | */ |
01b99998 SW |
62 | if (skip_radar && (chan->flag & HOSTAPD_CHAN_RADAR) && |
63 | ((chan->flag & HOSTAPD_CHAN_DFS_MASK) != | |
64 | HOSTAPD_CHAN_DFS_AVAILABLE)) | |
b72f949b MK |
65 | return 0; |
66 | ||
58b73e3d JD |
67 | if (chan->flag & HOSTAPD_CHAN_DISABLED) |
68 | return 0; | |
69 | if ((chan->flag & HOSTAPD_CHAN_RADAR) && | |
70 | ((chan->flag & HOSTAPD_CHAN_DFS_MASK) == | |
71 | HOSTAPD_CHAN_DFS_UNAVAILABLE)) | |
72 | return 0; | |
73 | return 1; | |
74 | } | |
75 | ||
76 | ||
1dc17db3 | 77 | static int dfs_is_chan_allowed(struct hostapd_channel_data *chan, int n_chans) |
58b73e3d | 78 | { |
1dc17db3 JD |
79 | /* |
80 | * The tables contain first valid channel number based on channel width. | |
81 | * We will also choose this first channel as the control one. | |
82 | */ | |
83 | int allowed_40[] = { 36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157, | |
84 | 184, 192 }; | |
85 | /* | |
86 | * VHT80, valid channels based on center frequency: | |
87 | * 42, 58, 106, 122, 138, 155 | |
88 | */ | |
89 | int allowed_80[] = { 36, 52, 100, 116, 132, 149 }; | |
4f1e01b8 JD |
90 | /* |
91 | * VHT160 valid channels based on center frequency: | |
92 | * 50, 114 | |
93 | */ | |
94 | int allowed_160[] = { 36, 100 }; | |
1dc17db3 JD |
95 | int *allowed = allowed_40; |
96 | unsigned int i, allowed_no = 0; | |
97 | ||
98 | switch (n_chans) { | |
99 | case 2: | |
100 | allowed = allowed_40; | |
e7ecab4a | 101 | allowed_no = ARRAY_SIZE(allowed_40); |
1dc17db3 JD |
102 | break; |
103 | case 4: | |
104 | allowed = allowed_80; | |
e7ecab4a | 105 | allowed_no = ARRAY_SIZE(allowed_80); |
1dc17db3 | 106 | break; |
4f1e01b8 JD |
107 | case 8: |
108 | allowed = allowed_160; | |
109 | allowed_no = ARRAY_SIZE(allowed_160); | |
110 | break; | |
1dc17db3 JD |
111 | default: |
112 | wpa_printf(MSG_DEBUG, "Unknown width for %d channels", n_chans); | |
113 | break; | |
114 | } | |
58b73e3d | 115 | |
1dc17db3 | 116 | for (i = 0; i < allowed_no; i++) { |
58b73e3d JD |
117 | if (chan->chan == allowed[i]) |
118 | return 1; | |
119 | } | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | ||
6a398ddc | 125 | static int dfs_chan_range_available(struct hostapd_hw_modes *mode, |
b72f949b MK |
126 | int first_chan_idx, int num_chans, |
127 | int skip_radar) | |
6a398ddc MK |
128 | { |
129 | struct hostapd_channel_data *first_chan, *chan; | |
130 | int i; | |
131 | ||
132 | if (first_chan_idx + num_chans >= mode->num_channels) | |
133 | return 0; | |
134 | ||
135 | first_chan = &mode->channels[first_chan_idx]; | |
136 | ||
137 | for (i = 0; i < num_chans; i++) { | |
138 | chan = &mode->channels[first_chan_idx + i]; | |
139 | ||
140 | if (first_chan->freq + i * 20 != chan->freq) | |
141 | return 0; | |
142 | ||
b72f949b | 143 | if (!dfs_channel_available(chan, skip_radar)) |
6a398ddc MK |
144 | return 0; |
145 | } | |
146 | ||
147 | return 1; | |
148 | } | |
149 | ||
150 | ||
70ee1be2 SW |
151 | static int is_in_chanlist(struct hostapd_iface *iface, |
152 | struct hostapd_channel_data *chan) | |
153 | { | |
154 | int *entry; | |
155 | ||
156 | if (!iface->conf->chanlist) | |
157 | return 1; | |
158 | ||
159 | for (entry = iface->conf->chanlist; *entry != -1; entry++) { | |
160 | if (*entry == chan->chan) | |
161 | return 1; | |
162 | } | |
163 | return 0; | |
164 | } | |
165 | ||
166 | ||
32595da6 MK |
167 | /* |
168 | * The function assumes HT40+ operation. | |
169 | * Make sure to adjust the following variables after calling this: | |
170 | * - hapd->secondary_channel | |
171 | * - hapd->vht_oper_centr_freq_seg0_idx | |
172 | * - hapd->vht_oper_centr_freq_seg1_idx | |
173 | */ | |
dc036d9e | 174 | static int dfs_find_channel(struct hostapd_iface *iface, |
6de0e0c9 | 175 | struct hostapd_channel_data **ret_chan, |
b72f949b | 176 | int idx, int skip_radar) |
e76da505 JD |
177 | { |
178 | struct hostapd_hw_modes *mode; | |
6a398ddc | 179 | struct hostapd_channel_data *chan; |
4a274f48 | 180 | int i, channel_idx = 0, n_chans, n_chans1; |
e76da505 | 181 | |
dc036d9e | 182 | mode = iface->current_mode; |
4a274f48 | 183 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); |
e76da505 | 184 | |
58b73e3d | 185 | wpa_printf(MSG_DEBUG, "DFS new chan checking %d channels", n_chans); |
e76da505 JD |
186 | for (i = 0; i < mode->num_channels; i++) { |
187 | chan = &mode->channels[i]; | |
188 | ||
6a398ddc | 189 | /* Skip HT40/VHT incompatible channels */ |
dc036d9e JM |
190 | if (iface->conf->ieee80211n && |
191 | iface->conf->secondary_channel && | |
6a398ddc | 192 | !dfs_is_chan_allowed(chan, n_chans)) |
e76da505 JD |
193 | continue; |
194 | ||
6a398ddc | 195 | /* Skip incompatible chandefs */ |
b72f949b | 196 | if (!dfs_chan_range_available(mode, i, n_chans, skip_radar)) |
6a398ddc | 197 | continue; |
e76da505 | 198 | |
70ee1be2 SW |
199 | if (!is_in_chanlist(iface, chan)) |
200 | continue; | |
201 | ||
e76da505 JD |
202 | if (ret_chan && idx == channel_idx) { |
203 | wpa_printf(MSG_DEBUG, "Selected ch. #%d", chan->chan); | |
204 | *ret_chan = chan; | |
205 | return idx; | |
206 | } | |
58b73e3d | 207 | wpa_printf(MSG_DEBUG, "Adding channel: %d", chan->chan); |
e76da505 JD |
208 | channel_idx++; |
209 | } | |
210 | return channel_idx; | |
211 | } | |
212 | ||
213 | ||
dc036d9e | 214 | static void dfs_adjust_vht_center_freq(struct hostapd_iface *iface, |
32595da6 | 215 | struct hostapd_channel_data *chan, |
eed65aad | 216 | int secondary_channel, |
32595da6 MK |
217 | u8 *vht_oper_centr_freq_seg0_idx, |
218 | u8 *vht_oper_centr_freq_seg1_idx) | |
58b73e3d | 219 | { |
dc036d9e | 220 | if (!iface->conf->ieee80211ac) |
58b73e3d JD |
221 | return; |
222 | ||
223 | if (!chan) | |
224 | return; | |
225 | ||
32595da6 MK |
226 | *vht_oper_centr_freq_seg1_idx = 0; |
227 | ||
dc036d9e | 228 | switch (iface->conf->vht_oper_chwidth) { |
58b73e3d | 229 | case VHT_CHANWIDTH_USE_HT: |
eed65aad | 230 | if (secondary_channel == 1) |
32595da6 | 231 | *vht_oper_centr_freq_seg0_idx = chan->chan + 2; |
eed65aad | 232 | else if (secondary_channel == -1) |
32595da6 | 233 | *vht_oper_centr_freq_seg0_idx = chan->chan - 2; |
345276a6 | 234 | else |
32595da6 | 235 | *vht_oper_centr_freq_seg0_idx = chan->chan; |
58b73e3d JD |
236 | break; |
237 | case VHT_CHANWIDTH_80MHZ: | |
32595da6 | 238 | *vht_oper_centr_freq_seg0_idx = chan->chan + 6; |
58b73e3d | 239 | break; |
899cc14e | 240 | case VHT_CHANWIDTH_160MHZ: |
32595da6 | 241 | *vht_oper_centr_freq_seg0_idx = chan->chan + 14; |
35f83637 | 242 | break; |
58b73e3d | 243 | default: |
899cc14e | 244 | wpa_printf(MSG_INFO, "DFS only VHT20/40/80/160 is supported now"); |
3d91a047 | 245 | *vht_oper_centr_freq_seg0_idx = 0; |
58b73e3d JD |
246 | break; |
247 | } | |
248 | ||
32595da6 MK |
249 | wpa_printf(MSG_DEBUG, "DFS adjusting VHT center frequency: %d, %d", |
250 | *vht_oper_centr_freq_seg0_idx, | |
251 | *vht_oper_centr_freq_seg1_idx); | |
58b73e3d JD |
252 | } |
253 | ||
254 | ||
255 | /* Return start channel idx we will use for mode->channels[idx] */ | |
4a274f48 | 256 | static int dfs_get_start_chan_idx(struct hostapd_iface *iface, int *seg1_start) |
58b73e3d JD |
257 | { |
258 | struct hostapd_hw_modes *mode; | |
259 | struct hostapd_channel_data *chan; | |
dc036d9e | 260 | int channel_no = iface->conf->channel; |
58b73e3d | 261 | int res = -1, i; |
4a274f48 JM |
262 | int chan_seg1 = -1; |
263 | ||
264 | *seg1_start = -1; | |
58b73e3d JD |
265 | |
266 | /* HT40- */ | |
dc036d9e | 267 | if (iface->conf->ieee80211n && iface->conf->secondary_channel == -1) |
58b73e3d JD |
268 | channel_no -= 4; |
269 | ||
270 | /* VHT */ | |
dc036d9e JM |
271 | if (iface->conf->ieee80211ac) { |
272 | switch (iface->conf->vht_oper_chwidth) { | |
58b73e3d JD |
273 | case VHT_CHANWIDTH_USE_HT: |
274 | break; | |
275 | case VHT_CHANWIDTH_80MHZ: | |
276 | channel_no = | |
dc036d9e | 277 | iface->conf->vht_oper_centr_freq_seg0_idx - 6; |
58b73e3d | 278 | break; |
899cc14e JD |
279 | case VHT_CHANWIDTH_160MHZ: |
280 | channel_no = | |
dc036d9e | 281 | iface->conf->vht_oper_centr_freq_seg0_idx - 14; |
899cc14e | 282 | break; |
4a274f48 JM |
283 | case VHT_CHANWIDTH_80P80MHZ: |
284 | channel_no = | |
285 | iface->conf->vht_oper_centr_freq_seg0_idx - 6; | |
286 | chan_seg1 = | |
287 | iface->conf->vht_oper_centr_freq_seg1_idx - 6; | |
288 | break; | |
58b73e3d JD |
289 | default: |
290 | wpa_printf(MSG_INFO, | |
4a274f48 | 291 | "DFS only VHT20/40/80/160/80+80 is supported now"); |
58b73e3d JD |
292 | channel_no = -1; |
293 | break; | |
294 | } | |
295 | } | |
296 | ||
297 | /* Get idx */ | |
dc036d9e | 298 | mode = iface->current_mode; |
58b73e3d JD |
299 | for (i = 0; i < mode->num_channels; i++) { |
300 | chan = &mode->channels[i]; | |
301 | if (chan->chan == channel_no) { | |
302 | res = i; | |
303 | break; | |
304 | } | |
305 | } | |
306 | ||
4a274f48 JM |
307 | if (res != -1 && chan_seg1 > -1) { |
308 | int found = 0; | |
309 | ||
310 | /* Get idx for seg1 */ | |
311 | mode = iface->current_mode; | |
312 | for (i = 0; i < mode->num_channels; i++) { | |
313 | chan = &mode->channels[i]; | |
314 | if (chan->chan == chan_seg1) { | |
315 | *seg1_start = i; | |
316 | found = 1; | |
317 | break; | |
318 | } | |
319 | } | |
320 | if (!found) | |
321 | res = -1; | |
322 | } | |
323 | ||
7450c128 BG |
324 | if (res == -1) { |
325 | wpa_printf(MSG_DEBUG, | |
326 | "DFS chan_idx seems wrong; num-ch: %d ch-no: %d conf-ch-no: %d 11n: %d sec-ch: %d vht-oper-width: %d", | |
327 | mode->num_channels, channel_no, iface->conf->channel, | |
328 | iface->conf->ieee80211n, | |
329 | iface->conf->secondary_channel, | |
330 | iface->conf->vht_oper_chwidth); | |
331 | ||
332 | for (i = 0; i < mode->num_channels; i++) { | |
333 | wpa_printf(MSG_DEBUG, "Available channel: %d", | |
334 | mode->channels[i].chan); | |
335 | } | |
336 | } | |
58b73e3d JD |
337 | |
338 | return res; | |
339 | } | |
340 | ||
341 | ||
342 | /* At least one channel have radar flag */ | |
dc036d9e JM |
343 | static int dfs_check_chans_radar(struct hostapd_iface *iface, |
344 | int start_chan_idx, int n_chans) | |
58b73e3d JD |
345 | { |
346 | struct hostapd_channel_data *channel; | |
347 | struct hostapd_hw_modes *mode; | |
348 | int i, res = 0; | |
349 | ||
dc036d9e | 350 | mode = iface->current_mode; |
58b73e3d JD |
351 | |
352 | for (i = 0; i < n_chans; i++) { | |
353 | channel = &mode->channels[start_chan_idx + i]; | |
354 | if (channel->flag & HOSTAPD_CHAN_RADAR) | |
355 | res++; | |
356 | } | |
357 | ||
358 | return res; | |
359 | } | |
360 | ||
361 | ||
362 | /* All channels available */ | |
dc036d9e | 363 | static int dfs_check_chans_available(struct hostapd_iface *iface, |
58b73e3d JD |
364 | int start_chan_idx, int n_chans) |
365 | { | |
366 | struct hostapd_channel_data *channel; | |
367 | struct hostapd_hw_modes *mode; | |
368 | int i; | |
369 | ||
dc036d9e | 370 | mode = iface->current_mode; |
58b73e3d | 371 | |
8c9cb81f | 372 | for (i = 0; i < n_chans; i++) { |
58b73e3d | 373 | channel = &mode->channels[start_chan_idx + i]; |
b8058a69 JD |
374 | |
375 | if (channel->flag & HOSTAPD_CHAN_DISABLED) | |
376 | break; | |
377 | ||
378 | if (!(channel->flag & HOSTAPD_CHAN_RADAR)) | |
379 | continue; | |
380 | ||
58b73e3d JD |
381 | if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) != |
382 | HOSTAPD_CHAN_DFS_AVAILABLE) | |
383 | break; | |
384 | } | |
385 | ||
386 | return i == n_chans; | |
387 | } | |
388 | ||
389 | ||
390 | /* At least one channel unavailable */ | |
dc036d9e | 391 | static int dfs_check_chans_unavailable(struct hostapd_iface *iface, |
58b73e3d JD |
392 | int start_chan_idx, |
393 | int n_chans) | |
394 | { | |
395 | struct hostapd_channel_data *channel; | |
396 | struct hostapd_hw_modes *mode; | |
397 | int i, res = 0; | |
398 | ||
dc036d9e | 399 | mode = iface->current_mode; |
58b73e3d | 400 | |
8c9cb81f | 401 | for (i = 0; i < n_chans; i++) { |
58b73e3d JD |
402 | channel = &mode->channels[start_chan_idx + i]; |
403 | if (channel->flag & HOSTAPD_CHAN_DISABLED) | |
404 | res++; | |
405 | if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) == | |
406 | HOSTAPD_CHAN_DFS_UNAVAILABLE) | |
407 | res++; | |
408 | } | |
409 | ||
410 | return res; | |
411 | } | |
412 | ||
413 | ||
32595da6 | 414 | static struct hostapd_channel_data * |
dc036d9e | 415 | dfs_get_valid_channel(struct hostapd_iface *iface, |
32595da6 MK |
416 | int *secondary_channel, |
417 | u8 *vht_oper_centr_freq_seg0_idx, | |
b72f949b MK |
418 | u8 *vht_oper_centr_freq_seg1_idx, |
419 | int skip_radar) | |
e76da505 JD |
420 | { |
421 | struct hostapd_hw_modes *mode; | |
422 | struct hostapd_channel_data *chan = NULL; | |
32595da6 MK |
423 | int num_available_chandefs; |
424 | int chan_idx; | |
e76da505 JD |
425 | u32 _rand; |
426 | ||
427 | wpa_printf(MSG_DEBUG, "DFS: Selecting random channel"); | |
3d91a047 JM |
428 | *secondary_channel = 0; |
429 | *vht_oper_centr_freq_seg0_idx = 0; | |
430 | *vht_oper_centr_freq_seg1_idx = 0; | |
e76da505 | 431 | |
dc036d9e | 432 | if (iface->current_mode == NULL) |
e76da505 JD |
433 | return NULL; |
434 | ||
dc036d9e | 435 | mode = iface->current_mode; |
e76da505 JD |
436 | if (mode->mode != HOSTAPD_MODE_IEEE80211A) |
437 | return NULL; | |
438 | ||
32595da6 | 439 | /* Get the count first */ |
b72f949b | 440 | num_available_chandefs = dfs_find_channel(iface, NULL, 0, skip_radar); |
32595da6 MK |
441 | if (num_available_chandefs == 0) |
442 | return NULL; | |
e76da505 | 443 | |
7c0e5b58 JM |
444 | if (os_get_random((u8 *) &_rand, sizeof(_rand)) < 0) |
445 | _rand = os_random(); | |
32595da6 | 446 | chan_idx = _rand % num_available_chandefs; |
b72f949b | 447 | dfs_find_channel(iface, &chan, chan_idx, skip_radar); |
32595da6 MK |
448 | |
449 | /* dfs_find_channel() calculations assume HT40+ */ | |
dc036d9e | 450 | if (iface->conf->secondary_channel) |
32595da6 MK |
451 | *secondary_channel = 1; |
452 | else | |
453 | *secondary_channel = 0; | |
454 | ||
dc036d9e | 455 | dfs_adjust_vht_center_freq(iface, chan, |
eed65aad | 456 | *secondary_channel, |
32595da6 MK |
457 | vht_oper_centr_freq_seg0_idx, |
458 | vht_oper_centr_freq_seg1_idx); | |
58b73e3d | 459 | |
e76da505 JD |
460 | return chan; |
461 | } | |
462 | ||
463 | ||
dc036d9e | 464 | static int set_dfs_state_freq(struct hostapd_iface *iface, int freq, u32 state) |
e76da505 JD |
465 | { |
466 | struct hostapd_hw_modes *mode; | |
467 | struct hostapd_channel_data *chan = NULL; | |
468 | int i; | |
469 | ||
dc036d9e | 470 | mode = iface->current_mode; |
e76da505 JD |
471 | if (mode == NULL) |
472 | return 0; | |
473 | ||
58b73e3d | 474 | wpa_printf(MSG_DEBUG, "set_dfs_state 0x%X for %d MHz", state, freq); |
dc036d9e JM |
475 | for (i = 0; i < iface->current_mode->num_channels; i++) { |
476 | chan = &iface->current_mode->channels[i]; | |
e76da505 JD |
477 | if (chan->freq == freq) { |
478 | if (chan->flag & HOSTAPD_CHAN_RADAR) { | |
479 | chan->flag &= ~HOSTAPD_CHAN_DFS_MASK; | |
480 | chan->flag |= state; | |
481 | return 1; /* Channel found */ | |
482 | } | |
483 | } | |
484 | } | |
485 | wpa_printf(MSG_WARNING, "Can't set DFS state for freq %d MHz", freq); | |
486 | return 0; | |
487 | } | |
488 | ||
489 | ||
dc036d9e | 490 | static int set_dfs_state(struct hostapd_iface *iface, int freq, int ht_enabled, |
58b73e3d JD |
491 | int chan_offset, int chan_width, int cf1, |
492 | int cf2, u32 state) | |
493 | { | |
494 | int n_chans = 1, i; | |
495 | struct hostapd_hw_modes *mode; | |
496 | int frequency = freq; | |
497 | int ret = 0; | |
498 | ||
dc036d9e | 499 | mode = iface->current_mode; |
58b73e3d JD |
500 | if (mode == NULL) |
501 | return 0; | |
502 | ||
503 | if (mode->mode != HOSTAPD_MODE_IEEE80211A) { | |
504 | wpa_printf(MSG_WARNING, "current_mode != IEEE80211A"); | |
505 | return 0; | |
506 | } | |
507 | ||
508 | /* Seems cf1 and chan_width is enough here */ | |
509 | switch (chan_width) { | |
510 | case CHAN_WIDTH_20_NOHT: | |
511 | case CHAN_WIDTH_20: | |
512 | n_chans = 1; | |
bb337dda JM |
513 | if (frequency == 0) |
514 | frequency = cf1; | |
58b73e3d JD |
515 | break; |
516 | case CHAN_WIDTH_40: | |
517 | n_chans = 2; | |
518 | frequency = cf1 - 10; | |
519 | break; | |
520 | case CHAN_WIDTH_80: | |
521 | n_chans = 4; | |
522 | frequency = cf1 - 30; | |
523 | break; | |
899cc14e JD |
524 | case CHAN_WIDTH_160: |
525 | n_chans = 8; | |
526 | frequency = cf1 - 70; | |
527 | break; | |
58b73e3d JD |
528 | default: |
529 | wpa_printf(MSG_INFO, "DFS chan_width %d not supported", | |
530 | chan_width); | |
531 | break; | |
532 | } | |
533 | ||
534 | wpa_printf(MSG_DEBUG, "DFS freq: %dMHz, n_chans: %d", frequency, | |
535 | n_chans); | |
536 | for (i = 0; i < n_chans; i++) { | |
dc036d9e | 537 | ret += set_dfs_state_freq(iface, frequency, state); |
58b73e3d JD |
538 | frequency = frequency + 20; |
539 | } | |
540 | ||
541 | return ret; | |
542 | } | |
543 | ||
544 | ||
dc036d9e | 545 | static int dfs_are_channels_overlapped(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
546 | int chan_width, int cf1, int cf2) |
547 | { | |
4a274f48 | 548 | int start_chan_idx, start_chan_idx1; |
58b73e3d JD |
549 | struct hostapd_hw_modes *mode; |
550 | struct hostapd_channel_data *chan; | |
4a274f48 | 551 | int n_chans, n_chans1, i, j, frequency = freq, radar_n_chans = 1; |
58b73e3d JD |
552 | u8 radar_chan; |
553 | int res = 0; | |
554 | ||
58b73e3d | 555 | /* Our configuration */ |
dc036d9e | 556 | mode = iface->current_mode; |
4a274f48 JM |
557 | start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1); |
558 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); | |
58b73e3d | 559 | |
5eaf240a | 560 | /* Check we are on DFS channel(s) */ |
dc036d9e | 561 | if (!dfs_check_chans_radar(iface, start_chan_idx, n_chans)) |
5eaf240a JD |
562 | return 0; |
563 | ||
58b73e3d JD |
564 | /* Reported via radar event */ |
565 | switch (chan_width) { | |
566 | case CHAN_WIDTH_20_NOHT: | |
567 | case CHAN_WIDTH_20: | |
568 | radar_n_chans = 1; | |
bb337dda JM |
569 | if (frequency == 0) |
570 | frequency = cf1; | |
58b73e3d JD |
571 | break; |
572 | case CHAN_WIDTH_40: | |
573 | radar_n_chans = 2; | |
574 | frequency = cf1 - 10; | |
575 | break; | |
576 | case CHAN_WIDTH_80: | |
577 | radar_n_chans = 4; | |
578 | frequency = cf1 - 30; | |
579 | break; | |
899cc14e JD |
580 | case CHAN_WIDTH_160: |
581 | radar_n_chans = 8; | |
582 | frequency = cf1 - 70; | |
583 | break; | |
58b73e3d JD |
584 | default: |
585 | wpa_printf(MSG_INFO, "DFS chan_width %d not supported", | |
586 | chan_width); | |
587 | break; | |
588 | } | |
589 | ||
590 | ieee80211_freq_to_chan(frequency, &radar_chan); | |
591 | ||
592 | for (i = 0; i < n_chans; i++) { | |
593 | chan = &mode->channels[start_chan_idx + i]; | |
5eaf240a JD |
594 | if (!(chan->flag & HOSTAPD_CHAN_RADAR)) |
595 | continue; | |
58b73e3d JD |
596 | for (j = 0; j < radar_n_chans; j++) { |
597 | wpa_printf(MSG_DEBUG, "checking our: %d, radar: %d", | |
598 | chan->chan, radar_chan + j * 4); | |
599 | if (chan->chan == radar_chan + j * 4) | |
600 | res++; | |
601 | } | |
602 | } | |
603 | ||
604 | wpa_printf(MSG_DEBUG, "overlapped: %d", res); | |
605 | ||
606 | return res; | |
607 | } | |
608 | ||
609 | ||
bbbacbf2 JD |
610 | static unsigned int dfs_get_cac_time(struct hostapd_iface *iface, |
611 | int start_chan_idx, int n_chans) | |
612 | { | |
613 | struct hostapd_channel_data *channel; | |
614 | struct hostapd_hw_modes *mode; | |
615 | int i; | |
616 | unsigned int cac_time_ms = 0; | |
617 | ||
618 | mode = iface->current_mode; | |
619 | ||
620 | for (i = 0; i < n_chans; i++) { | |
621 | channel = &mode->channels[start_chan_idx + i]; | |
622 | if (!(channel->flag & HOSTAPD_CHAN_RADAR)) | |
623 | continue; | |
624 | if (channel->dfs_cac_ms > cac_time_ms) | |
625 | cac_time_ms = channel->dfs_cac_ms; | |
626 | } | |
627 | ||
628 | return cac_time_ms; | |
629 | } | |
630 | ||
631 | ||
e76da505 JD |
632 | /* |
633 | * Main DFS handler | |
634 | * 1 - continue channel/ap setup | |
635 | * 0 - channel/ap setup will be continued after CAC | |
636 | * -1 - hit critical error | |
637 | */ | |
dc036d9e | 638 | int hostapd_handle_dfs(struct hostapd_iface *iface) |
e76da505 | 639 | { |
e76da505 | 640 | struct hostapd_channel_data *channel; |
4a274f48 | 641 | int res, n_chans, n_chans1, start_chan_idx, start_chan_idx1; |
b72f949b | 642 | int skip_radar = 0; |
58b73e3d | 643 | |
afbe57d9 JM |
644 | if (!iface->current_mode) { |
645 | /* | |
646 | * This can happen with drivers that do not provide mode | |
647 | * information and as such, cannot really use hostapd for DFS. | |
648 | */ | |
649 | wpa_printf(MSG_DEBUG, | |
650 | "DFS: No current_mode information - assume no need to perform DFS operations by hostapd"); | |
651 | return 1; | |
652 | } | |
653 | ||
dc036d9e | 654 | iface->cac_started = 0; |
954e71d2 | 655 | |
58b73e3d JD |
656 | do { |
657 | /* Get start (first) channel for current configuration */ | |
4a274f48 JM |
658 | start_chan_idx = dfs_get_start_chan_idx(iface, |
659 | &start_chan_idx1); | |
58b73e3d JD |
660 | if (start_chan_idx == -1) |
661 | return -1; | |
662 | ||
663 | /* Get number of used channels, depend on width */ | |
4a274f48 | 664 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); |
58b73e3d | 665 | |
bbbacbf2 JD |
666 | /* Setup CAC time */ |
667 | iface->dfs_cac_ms = dfs_get_cac_time(iface, start_chan_idx, | |
668 | n_chans); | |
669 | ||
58b73e3d | 670 | /* Check if any of configured channels require DFS */ |
dc036d9e | 671 | res = dfs_check_chans_radar(iface, start_chan_idx, n_chans); |
58b73e3d JD |
672 | wpa_printf(MSG_DEBUG, |
673 | "DFS %d channels required radar detection", | |
674 | res); | |
675 | if (!res) | |
676 | return 1; | |
677 | ||
678 | /* Check if all channels are DFS available */ | |
dc036d9e | 679 | res = dfs_check_chans_available(iface, start_chan_idx, n_chans); |
58b73e3d JD |
680 | wpa_printf(MSG_DEBUG, |
681 | "DFS all channels available, (SKIP CAC): %s", | |
682 | res ? "yes" : "no"); | |
683 | if (res) | |
684 | return 1; | |
685 | ||
686 | /* Check if any of configured channels is unavailable */ | |
dc036d9e | 687 | res = dfs_check_chans_unavailable(iface, start_chan_idx, |
58b73e3d JD |
688 | n_chans); |
689 | wpa_printf(MSG_DEBUG, "DFS %d chans unavailable - choose other channel: %s", | |
690 | res, res ? "yes": "no"); | |
691 | if (res) { | |
5479ff90 MS |
692 | int sec = 0; |
693 | u8 cf1 = 0, cf2 = 0; | |
32595da6 | 694 | |
b72f949b MK |
695 | channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2, |
696 | skip_radar); | |
e76da505 JD |
697 | if (!channel) { |
698 | wpa_printf(MSG_ERROR, "could not get valid channel"); | |
699 | return -1; | |
700 | } | |
32595da6 | 701 | |
dc036d9e JM |
702 | iface->freq = channel->freq; |
703 | iface->conf->channel = channel->chan; | |
704 | iface->conf->secondary_channel = sec; | |
705 | iface->conf->vht_oper_centr_freq_seg0_idx = cf1; | |
706 | iface->conf->vht_oper_centr_freq_seg1_idx = cf2; | |
e76da505 | 707 | } |
58b73e3d JD |
708 | } while (res); |
709 | ||
710 | /* Finally start CAC */ | |
dc036d9e JM |
711 | hostapd_set_state(iface, HAPD_IFACE_DFS); |
712 | wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz", iface->freq); | |
713 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START | |
bbbacbf2 | 714 | "freq=%d chan=%d sec_chan=%d, width=%d, seg0=%d, seg1=%d, cac_time=%ds", |
dc036d9e | 715 | iface->freq, |
1f374834 JD |
716 | iface->conf->channel, iface->conf->secondary_channel, |
717 | iface->conf->vht_oper_chwidth, | |
718 | iface->conf->vht_oper_centr_freq_seg0_idx, | |
bbbacbf2 JD |
719 | iface->conf->vht_oper_centr_freq_seg1_idx, |
720 | iface->dfs_cac_ms / 1000); | |
1f374834 JD |
721 | |
722 | res = hostapd_start_dfs_cac(iface, iface->conf->hw_mode, | |
723 | iface->freq, | |
724 | iface->conf->channel, | |
725 | iface->conf->ieee80211n, | |
726 | iface->conf->ieee80211ac, | |
727 | iface->conf->secondary_channel, | |
728 | iface->conf->vht_oper_chwidth, | |
729 | iface->conf->vht_oper_centr_freq_seg0_idx, | |
730 | iface->conf->vht_oper_centr_freq_seg1_idx); | |
731 | ||
732 | if (res) { | |
733 | wpa_printf(MSG_ERROR, "DFS start_dfs_cac() failed, %d", res); | |
58b73e3d | 734 | return -1; |
e76da505 JD |
735 | } |
736 | ||
58b73e3d | 737 | return 0; |
e76da505 JD |
738 | } |
739 | ||
740 | ||
dc036d9e | 741 | int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq, |
58b73e3d JD |
742 | int ht_enabled, int chan_offset, int chan_width, |
743 | int cf1, int cf2) | |
e76da505 | 744 | { |
dc036d9e | 745 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_COMPLETED |
186c9059 JM |
746 | "success=%d freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
747 | success, freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
748 | ||
e76da505 JD |
749 | if (success) { |
750 | /* Complete iface/ap configuration */ | |
5de81d7a AK |
751 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) { |
752 | /* Complete AP configuration for the first bring up. */ | |
753 | if (iface->state != HAPD_IFACE_ENABLED) | |
754 | hostapd_setup_interface_complete(iface, 0); | |
755 | else | |
756 | iface->cac_started = 0; | |
757 | } else { | |
758 | set_dfs_state(iface, freq, ht_enabled, chan_offset, | |
759 | chan_width, cf1, cf2, | |
760 | HOSTAPD_CHAN_DFS_AVAILABLE); | |
761 | iface->cac_started = 0; | |
762 | hostapd_setup_interface_complete(iface, 0); | |
763 | } | |
e76da505 JD |
764 | } |
765 | ||
766 | return 0; | |
767 | } | |
768 | ||
769 | ||
f7154cee | 770 | static int hostapd_dfs_start_channel_switch_cac(struct hostapd_iface *iface) |
e76da505 JD |
771 | { |
772 | struct hostapd_channel_data *channel; | |
f7154cee | 773 | int secondary_channel; |
5479ff90 MS |
774 | u8 vht_oper_centr_freq_seg0_idx = 0; |
775 | u8 vht_oper_centr_freq_seg1_idx = 0; | |
f7154cee | 776 | int skip_radar = 0; |
e76da505 | 777 | int err = 1; |
f7154cee JD |
778 | |
779 | /* Radar detected during active CAC */ | |
780 | iface->cac_started = 0; | |
781 | channel = dfs_get_valid_channel(iface, &secondary_channel, | |
782 | &vht_oper_centr_freq_seg0_idx, | |
783 | &vht_oper_centr_freq_seg1_idx, | |
784 | skip_radar); | |
785 | ||
786 | if (!channel) { | |
787 | wpa_printf(MSG_ERROR, "No valid channel available"); | |
788 | hostapd_setup_interface_complete(iface, err); | |
789 | return err; | |
790 | } | |
791 | ||
792 | wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d", | |
793 | channel->chan); | |
794 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL | |
795 | "freq=%d chan=%d sec_chan=%d", channel->freq, | |
796 | channel->chan, secondary_channel); | |
797 | ||
798 | iface->freq = channel->freq; | |
799 | iface->conf->channel = channel->chan; | |
800 | iface->conf->secondary_channel = secondary_channel; | |
801 | iface->conf->vht_oper_centr_freq_seg0_idx = | |
802 | vht_oper_centr_freq_seg0_idx; | |
803 | iface->conf->vht_oper_centr_freq_seg1_idx = | |
804 | vht_oper_centr_freq_seg1_idx; | |
805 | err = 0; | |
806 | ||
807 | hostapd_setup_interface_complete(iface, err); | |
808 | return err; | |
809 | } | |
810 | ||
811 | ||
6782b684 MK |
812 | static int hostapd_csa_in_progress(struct hostapd_iface *iface) |
813 | { | |
814 | unsigned int i; | |
815 | for (i = 0; i < iface->num_bss; i++) | |
816 | if (iface->bss[i]->csa_in_progress) | |
817 | return 1; | |
818 | return 0; | |
819 | } | |
820 | ||
821 | ||
f7154cee JD |
822 | static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface) |
823 | { | |
824 | struct hostapd_channel_data *channel; | |
32595da6 MK |
825 | int secondary_channel; |
826 | u8 vht_oper_centr_freq_seg0_idx; | |
827 | u8 vht_oper_centr_freq_seg1_idx; | |
b72f949b | 828 | int skip_radar = 1; |
f7154cee | 829 | struct csa_settings csa_settings; |
8974620e | 830 | unsigned int i; |
f7154cee JD |
831 | int err = 1; |
832 | ||
25592b23 JD |
833 | wpa_printf(MSG_DEBUG, "%s called (CAC active: %s, CSA active: %s)", |
834 | __func__, iface->cac_started ? "yes" : "no", | |
6782b684 | 835 | hostapd_csa_in_progress(iface) ? "yes" : "no"); |
25592b23 JD |
836 | |
837 | /* Check if CSA in progress */ | |
6782b684 | 838 | if (hostapd_csa_in_progress(iface)) |
25592b23 | 839 | return 0; |
f7154cee JD |
840 | |
841 | /* Check if active CAC */ | |
842 | if (iface->cac_started) | |
843 | return hostapd_dfs_start_channel_switch_cac(iface); | |
e76da505 | 844 | |
f7154cee | 845 | /* Perform channel switch/CSA */ |
dc036d9e | 846 | channel = dfs_get_valid_channel(iface, &secondary_channel, |
32595da6 | 847 | &vht_oper_centr_freq_seg0_idx, |
b72f949b MK |
848 | &vht_oper_centr_freq_seg1_idx, |
849 | skip_radar); | |
813d4bac | 850 | |
f7154cee | 851 | if (!channel) { |
e0700512 SW |
852 | /* |
853 | * If there is no channel to switch immediately to, check if | |
854 | * there is another channel where we can switch even if it | |
855 | * requires to perform a CAC first. | |
856 | */ | |
857 | skip_radar = 0; | |
858 | channel = dfs_get_valid_channel(iface, &secondary_channel, | |
859 | &vht_oper_centr_freq_seg0_idx, | |
860 | &vht_oper_centr_freq_seg1_idx, | |
861 | skip_radar); | |
862 | if (!channel) { | |
863 | /* FIXME: Wait for channel(s) to become available */ | |
864 | hostapd_disable_iface(iface); | |
865 | return err; | |
866 | } | |
867 | ||
868 | iface->freq = channel->freq; | |
869 | iface->conf->channel = channel->chan; | |
870 | iface->conf->secondary_channel = secondary_channel; | |
871 | iface->conf->vht_oper_centr_freq_seg0_idx = | |
872 | vht_oper_centr_freq_seg0_idx; | |
873 | iface->conf->vht_oper_centr_freq_seg1_idx = | |
874 | vht_oper_centr_freq_seg1_idx; | |
875 | ||
f7154cee | 876 | hostapd_disable_iface(iface); |
e0700512 SW |
877 | hostapd_enable_iface(iface); |
878 | return 0; | |
f7154cee JD |
879 | } |
880 | ||
881 | wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d", | |
882 | channel->chan); | |
883 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL | |
884 | "freq=%d chan=%d sec_chan=%d", channel->freq, | |
885 | channel->chan, secondary_channel); | |
886 | ||
887 | /* Setup CSA request */ | |
888 | os_memset(&csa_settings, 0, sizeof(csa_settings)); | |
889 | csa_settings.cs_count = 5; | |
890 | csa_settings.block_tx = 1; | |
891 | err = hostapd_set_freq_params(&csa_settings.freq_params, | |
892 | iface->conf->hw_mode, | |
893 | channel->freq, | |
894 | channel->chan, | |
895 | iface->conf->ieee80211n, | |
896 | iface->conf->ieee80211ac, | |
897 | secondary_channel, | |
898 | iface->conf->vht_oper_chwidth, | |
899 | vht_oper_centr_freq_seg0_idx, | |
900 | vht_oper_centr_freq_seg1_idx, | |
901 | iface->current_mode->vht_capab); | |
902 | ||
903 | if (err) { | |
904 | wpa_printf(MSG_ERROR, "DFS failed to calculate CSA freq params"); | |
905 | hostapd_disable_iface(iface); | |
906 | return err; | |
907 | } | |
908 | ||
8974620e MK |
909 | for (i = 0; i < iface->num_bss; i++) { |
910 | err = hostapd_switch_channel(iface->bss[i], &csa_settings); | |
911 | if (err) | |
912 | break; | |
913 | } | |
914 | ||
f7154cee JD |
915 | if (err) { |
916 | wpa_printf(MSG_WARNING, "DFS failed to schedule CSA (%d) - trying fallback", | |
917 | err); | |
dc036d9e JM |
918 | iface->freq = channel->freq; |
919 | iface->conf->channel = channel->chan; | |
920 | iface->conf->secondary_channel = secondary_channel; | |
921 | iface->conf->vht_oper_centr_freq_seg0_idx = | |
922 | vht_oper_centr_freq_seg0_idx; | |
923 | iface->conf->vht_oper_centr_freq_seg1_idx = | |
924 | vht_oper_centr_freq_seg1_idx; | |
813d4bac | 925 | |
dc036d9e | 926 | hostapd_disable_iface(iface); |
f7154cee JD |
927 | hostapd_enable_iface(iface); |
928 | return 0; | |
2e946249 | 929 | } |
e76da505 | 930 | |
f7154cee JD |
931 | /* Channel configuration will be updated once CSA completes and |
932 | * ch_switch_notify event is received */ | |
933 | ||
934 | wpa_printf(MSG_DEBUG, "DFS waiting channel switch event"); | |
e76da505 JD |
935 | return 0; |
936 | } | |
58b73e3d JD |
937 | |
938 | ||
dc036d9e | 939 | int hostapd_dfs_radar_detected(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
940 | int ht_enabled, int chan_offset, int chan_width, |
941 | int cf1, int cf2) | |
942 | { | |
943 | int res; | |
944 | ||
dc036d9e | 945 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_RADAR_DETECTED |
186c9059 JM |
946 | "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
947 | freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
948 | ||
5de81d7a AK |
949 | /* Proceed only if DFS is not offloaded to the driver */ |
950 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) | |
951 | return 0; | |
952 | ||
953 | if (!iface->conf->ieee80211h) | |
954 | return 0; | |
955 | ||
58b73e3d | 956 | /* mark radar frequency as invalid */ |
c0e46bb7 JM |
957 | set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width, |
958 | cf1, cf2, HOSTAPD_CHAN_DFS_UNAVAILABLE); | |
58b73e3d JD |
959 | |
960 | /* Skip if reported radar event not overlapped our channels */ | |
dc036d9e | 961 | res = dfs_are_channels_overlapped(iface, freq, chan_width, cf1, cf2); |
58b73e3d JD |
962 | if (!res) |
963 | return 0; | |
964 | ||
58b73e3d | 965 | /* radar detected while operating, switch the channel. */ |
dc036d9e | 966 | res = hostapd_dfs_start_channel_switch(iface); |
58b73e3d JD |
967 | |
968 | return res; | |
969 | } | |
970 | ||
971 | ||
dc036d9e | 972 | int hostapd_dfs_nop_finished(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
973 | int ht_enabled, int chan_offset, int chan_width, |
974 | int cf1, int cf2) | |
975 | { | |
dc036d9e | 976 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NOP_FINISHED |
186c9059 JM |
977 | "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
978 | freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
5de81d7a AK |
979 | |
980 | /* Proceed only if DFS is not offloaded to the driver */ | |
981 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) | |
982 | return 0; | |
983 | ||
58b73e3d | 984 | /* TODO add correct implementation here */ |
dc036d9e JM |
985 | set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width, |
986 | cf1, cf2, HOSTAPD_CHAN_DFS_USABLE); | |
58b73e3d JD |
987 | return 0; |
988 | } | |
3d7ad2f6 C |
989 | |
990 | ||
991 | int hostapd_is_dfs_required(struct hostapd_iface *iface) | |
992 | { | |
4a274f48 | 993 | int n_chans, n_chans1, start_chan_idx, start_chan_idx1, res; |
3d7ad2f6 | 994 | |
8a0f3bf6 MP |
995 | if (!iface->conf->ieee80211h || !iface->current_mode || |
996 | iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A) | |
997 | return 0; | |
3d7ad2f6 C |
998 | |
999 | /* Get start (first) channel for current configuration */ | |
4a274f48 | 1000 | start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1); |
3d7ad2f6 C |
1001 | if (start_chan_idx == -1) |
1002 | return -1; | |
1003 | ||
1004 | /* Get number of used channels, depend on width */ | |
4a274f48 | 1005 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); |
3d7ad2f6 C |
1006 | |
1007 | /* Check if any of configured channels require DFS */ | |
4a274f48 JM |
1008 | res = dfs_check_chans_radar(iface, start_chan_idx, n_chans); |
1009 | if (res) | |
1010 | return res; | |
1011 | if (start_chan_idx1 >= 0 && n_chans1 > 0) | |
1012 | res = dfs_check_chans_radar(iface, start_chan_idx1, n_chans1); | |
1013 | return res; | |
3d7ad2f6 | 1014 | } |
c13578c3 AK |
1015 | |
1016 | ||
1017 | int hostapd_dfs_start_cac(struct hostapd_iface *iface, int freq, | |
1018 | int ht_enabled, int chan_offset, int chan_width, | |
1019 | int cf1, int cf2) | |
1020 | { | |
1021 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START | |
1022 | "freq=%d chan=%d chan_offset=%d width=%d seg0=%d " | |
1023 | "seg1=%d cac_time=%ds", | |
1024 | freq, (freq - 5000) / 5, chan_offset, chan_width, cf1, cf2, 60); | |
1025 | iface->cac_started = 1; | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1029 | ||
1030 | /* | |
1031 | * Main DFS handler for offloaded case. | |
1032 | * 2 - continue channel/AP setup for non-DFS channel | |
1033 | * 1 - continue channel/AP setup for DFS channel | |
1034 | * 0 - channel/AP setup will be continued after CAC | |
1035 | * -1 - hit critical error | |
1036 | */ | |
1037 | int hostapd_handle_dfs_offload(struct hostapd_iface *iface) | |
1038 | { | |
1039 | wpa_printf(MSG_DEBUG, "%s: iface->cac_started: %d", | |
1040 | __func__, iface->cac_started); | |
1041 | ||
1042 | /* | |
1043 | * If DFS has already been started, then we are being called from a | |
1044 | * callback to continue AP/channel setup. Reset the CAC start flag and | |
1045 | * return. | |
1046 | */ | |
1047 | if (iface->cac_started) { | |
1048 | wpa_printf(MSG_DEBUG, "%s: iface->cac_started: %d", | |
1049 | __func__, iface->cac_started); | |
1050 | iface->cac_started = 0; | |
1051 | return 1; | |
1052 | } | |
1053 | ||
1054 | if (ieee80211_is_dfs(iface->freq)) { | |
1055 | wpa_printf(MSG_DEBUG, "%s: freq %d MHz requires DFS", | |
1056 | __func__, iface->freq); | |
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | wpa_printf(MSG_DEBUG, | |
1061 | "%s: freq %d MHz does not require DFS. Continue channel/AP setup", | |
1062 | __func__, iface->freq); | |
1063 | return 2; | |
1064 | } |