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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> | |
7cbb5f1a | 4 | * Copyright (c) 2013-2017, 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 | ||
56ef9925 EP |
125 | static struct hostapd_channel_data * |
126 | dfs_get_chan_data(struct hostapd_hw_modes *mode, int freq, int first_chan_idx) | |
127 | { | |
128 | int i; | |
129 | ||
130 | for (i = first_chan_idx; i < mode->num_channels; i++) { | |
131 | if (mode->channels[i].freq == freq) | |
132 | return &mode->channels[i]; | |
133 | } | |
134 | ||
135 | return NULL; | |
136 | } | |
137 | ||
138 | ||
6a398ddc | 139 | static int dfs_chan_range_available(struct hostapd_hw_modes *mode, |
b72f949b MK |
140 | int first_chan_idx, int num_chans, |
141 | int skip_radar) | |
6a398ddc MK |
142 | { |
143 | struct hostapd_channel_data *first_chan, *chan; | |
144 | int i; | |
145 | ||
030a3e12 | 146 | if (first_chan_idx + num_chans > mode->num_channels) |
6a398ddc MK |
147 | return 0; |
148 | ||
149 | first_chan = &mode->channels[first_chan_idx]; | |
150 | ||
151 | for (i = 0; i < num_chans; i++) { | |
56ef9925 EP |
152 | chan = dfs_get_chan_data(mode, first_chan->freq + i * 20, |
153 | first_chan_idx); | |
154 | if (!chan) | |
6a398ddc MK |
155 | return 0; |
156 | ||
b72f949b | 157 | if (!dfs_channel_available(chan, skip_radar)) |
6a398ddc MK |
158 | return 0; |
159 | } | |
160 | ||
161 | return 1; | |
162 | } | |
163 | ||
164 | ||
70ee1be2 SW |
165 | static int is_in_chanlist(struct hostapd_iface *iface, |
166 | struct hostapd_channel_data *chan) | |
167 | { | |
857d9422 | 168 | if (!iface->conf->acs_ch_list.num) |
70ee1be2 SW |
169 | return 1; |
170 | ||
857d9422 | 171 | return freq_range_list_includes(&iface->conf->acs_ch_list, chan->chan); |
70ee1be2 SW |
172 | } |
173 | ||
174 | ||
32595da6 MK |
175 | /* |
176 | * The function assumes HT40+ operation. | |
177 | * Make sure to adjust the following variables after calling this: | |
178 | * - hapd->secondary_channel | |
179 | * - hapd->vht_oper_centr_freq_seg0_idx | |
180 | * - hapd->vht_oper_centr_freq_seg1_idx | |
181 | */ | |
dc036d9e | 182 | static int dfs_find_channel(struct hostapd_iface *iface, |
6de0e0c9 | 183 | struct hostapd_channel_data **ret_chan, |
b72f949b | 184 | int idx, int skip_radar) |
e76da505 JD |
185 | { |
186 | struct hostapd_hw_modes *mode; | |
6a398ddc | 187 | struct hostapd_channel_data *chan; |
4a274f48 | 188 | int i, channel_idx = 0, n_chans, n_chans1; |
e76da505 | 189 | |
dc036d9e | 190 | mode = iface->current_mode; |
4a274f48 | 191 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); |
e76da505 | 192 | |
58b73e3d | 193 | wpa_printf(MSG_DEBUG, "DFS new chan checking %d channels", n_chans); |
e76da505 JD |
194 | for (i = 0; i < mode->num_channels; i++) { |
195 | chan = &mode->channels[i]; | |
196 | ||
6a398ddc | 197 | /* Skip HT40/VHT incompatible channels */ |
dc036d9e JM |
198 | if (iface->conf->ieee80211n && |
199 | iface->conf->secondary_channel && | |
6a398ddc | 200 | !dfs_is_chan_allowed(chan, n_chans)) |
e76da505 JD |
201 | continue; |
202 | ||
6a398ddc | 203 | /* Skip incompatible chandefs */ |
b72f949b | 204 | if (!dfs_chan_range_available(mode, i, n_chans, skip_radar)) |
6a398ddc | 205 | continue; |
e76da505 | 206 | |
70ee1be2 SW |
207 | if (!is_in_chanlist(iface, chan)) |
208 | continue; | |
209 | ||
e76da505 JD |
210 | if (ret_chan && idx == channel_idx) { |
211 | wpa_printf(MSG_DEBUG, "Selected ch. #%d", chan->chan); | |
212 | *ret_chan = chan; | |
213 | return idx; | |
214 | } | |
58b73e3d | 215 | wpa_printf(MSG_DEBUG, "Adding channel: %d", chan->chan); |
e76da505 JD |
216 | channel_idx++; |
217 | } | |
218 | return channel_idx; | |
219 | } | |
220 | ||
221 | ||
dc036d9e | 222 | static void dfs_adjust_vht_center_freq(struct hostapd_iface *iface, |
32595da6 | 223 | struct hostapd_channel_data *chan, |
eed65aad | 224 | int secondary_channel, |
32595da6 MK |
225 | u8 *vht_oper_centr_freq_seg0_idx, |
226 | u8 *vht_oper_centr_freq_seg1_idx) | |
58b73e3d | 227 | { |
dc036d9e | 228 | if (!iface->conf->ieee80211ac) |
58b73e3d JD |
229 | return; |
230 | ||
231 | if (!chan) | |
232 | return; | |
233 | ||
32595da6 MK |
234 | *vht_oper_centr_freq_seg1_idx = 0; |
235 | ||
dc036d9e | 236 | switch (iface->conf->vht_oper_chwidth) { |
58b73e3d | 237 | case VHT_CHANWIDTH_USE_HT: |
eed65aad | 238 | if (secondary_channel == 1) |
32595da6 | 239 | *vht_oper_centr_freq_seg0_idx = chan->chan + 2; |
eed65aad | 240 | else if (secondary_channel == -1) |
32595da6 | 241 | *vht_oper_centr_freq_seg0_idx = chan->chan - 2; |
345276a6 | 242 | else |
32595da6 | 243 | *vht_oper_centr_freq_seg0_idx = chan->chan; |
58b73e3d JD |
244 | break; |
245 | case VHT_CHANWIDTH_80MHZ: | |
32595da6 | 246 | *vht_oper_centr_freq_seg0_idx = chan->chan + 6; |
58b73e3d | 247 | break; |
899cc14e | 248 | case VHT_CHANWIDTH_160MHZ: |
32595da6 | 249 | *vht_oper_centr_freq_seg0_idx = chan->chan + 14; |
35f83637 | 250 | break; |
58b73e3d | 251 | default: |
899cc14e | 252 | wpa_printf(MSG_INFO, "DFS only VHT20/40/80/160 is supported now"); |
3d91a047 | 253 | *vht_oper_centr_freq_seg0_idx = 0; |
58b73e3d JD |
254 | break; |
255 | } | |
256 | ||
32595da6 MK |
257 | wpa_printf(MSG_DEBUG, "DFS adjusting VHT center frequency: %d, %d", |
258 | *vht_oper_centr_freq_seg0_idx, | |
259 | *vht_oper_centr_freq_seg1_idx); | |
58b73e3d JD |
260 | } |
261 | ||
262 | ||
263 | /* Return start channel idx we will use for mode->channels[idx] */ | |
4a274f48 | 264 | static int dfs_get_start_chan_idx(struct hostapd_iface *iface, int *seg1_start) |
58b73e3d JD |
265 | { |
266 | struct hostapd_hw_modes *mode; | |
267 | struct hostapd_channel_data *chan; | |
dc036d9e | 268 | int channel_no = iface->conf->channel; |
58b73e3d | 269 | int res = -1, i; |
4a274f48 JM |
270 | int chan_seg1 = -1; |
271 | ||
272 | *seg1_start = -1; | |
58b73e3d JD |
273 | |
274 | /* HT40- */ | |
dc036d9e | 275 | if (iface->conf->ieee80211n && iface->conf->secondary_channel == -1) |
58b73e3d JD |
276 | channel_no -= 4; |
277 | ||
278 | /* VHT */ | |
dc036d9e JM |
279 | if (iface->conf->ieee80211ac) { |
280 | switch (iface->conf->vht_oper_chwidth) { | |
58b73e3d JD |
281 | case VHT_CHANWIDTH_USE_HT: |
282 | break; | |
283 | case VHT_CHANWIDTH_80MHZ: | |
284 | channel_no = | |
dc036d9e | 285 | iface->conf->vht_oper_centr_freq_seg0_idx - 6; |
58b73e3d | 286 | break; |
899cc14e JD |
287 | case VHT_CHANWIDTH_160MHZ: |
288 | channel_no = | |
dc036d9e | 289 | iface->conf->vht_oper_centr_freq_seg0_idx - 14; |
899cc14e | 290 | break; |
4a274f48 JM |
291 | case VHT_CHANWIDTH_80P80MHZ: |
292 | channel_no = | |
293 | iface->conf->vht_oper_centr_freq_seg0_idx - 6; | |
294 | chan_seg1 = | |
295 | iface->conf->vht_oper_centr_freq_seg1_idx - 6; | |
296 | break; | |
58b73e3d JD |
297 | default: |
298 | wpa_printf(MSG_INFO, | |
4a274f48 | 299 | "DFS only VHT20/40/80/160/80+80 is supported now"); |
58b73e3d JD |
300 | channel_no = -1; |
301 | break; | |
302 | } | |
303 | } | |
304 | ||
305 | /* Get idx */ | |
dc036d9e | 306 | mode = iface->current_mode; |
58b73e3d JD |
307 | for (i = 0; i < mode->num_channels; i++) { |
308 | chan = &mode->channels[i]; | |
309 | if (chan->chan == channel_no) { | |
310 | res = i; | |
311 | break; | |
312 | } | |
313 | } | |
314 | ||
4a274f48 JM |
315 | if (res != -1 && chan_seg1 > -1) { |
316 | int found = 0; | |
317 | ||
318 | /* Get idx for seg1 */ | |
319 | mode = iface->current_mode; | |
320 | for (i = 0; i < mode->num_channels; i++) { | |
321 | chan = &mode->channels[i]; | |
322 | if (chan->chan == chan_seg1) { | |
323 | *seg1_start = i; | |
324 | found = 1; | |
325 | break; | |
326 | } | |
327 | } | |
328 | if (!found) | |
329 | res = -1; | |
330 | } | |
331 | ||
7450c128 BG |
332 | if (res == -1) { |
333 | wpa_printf(MSG_DEBUG, | |
334 | "DFS chan_idx seems wrong; num-ch: %d ch-no: %d conf-ch-no: %d 11n: %d sec-ch: %d vht-oper-width: %d", | |
335 | mode->num_channels, channel_no, iface->conf->channel, | |
336 | iface->conf->ieee80211n, | |
337 | iface->conf->secondary_channel, | |
338 | iface->conf->vht_oper_chwidth); | |
339 | ||
340 | for (i = 0; i < mode->num_channels; i++) { | |
341 | wpa_printf(MSG_DEBUG, "Available channel: %d", | |
342 | mode->channels[i].chan); | |
343 | } | |
344 | } | |
58b73e3d JD |
345 | |
346 | return res; | |
347 | } | |
348 | ||
349 | ||
350 | /* At least one channel have radar flag */ | |
dc036d9e JM |
351 | static int dfs_check_chans_radar(struct hostapd_iface *iface, |
352 | int start_chan_idx, int n_chans) | |
58b73e3d JD |
353 | { |
354 | struct hostapd_channel_data *channel; | |
355 | struct hostapd_hw_modes *mode; | |
356 | int i, res = 0; | |
357 | ||
dc036d9e | 358 | mode = iface->current_mode; |
58b73e3d JD |
359 | |
360 | for (i = 0; i < n_chans; i++) { | |
361 | channel = &mode->channels[start_chan_idx + i]; | |
362 | if (channel->flag & HOSTAPD_CHAN_RADAR) | |
363 | res++; | |
364 | } | |
365 | ||
366 | return res; | |
367 | } | |
368 | ||
369 | ||
370 | /* All channels available */ | |
dc036d9e | 371 | static int dfs_check_chans_available(struct hostapd_iface *iface, |
58b73e3d JD |
372 | int start_chan_idx, int n_chans) |
373 | { | |
374 | struct hostapd_channel_data *channel; | |
375 | struct hostapd_hw_modes *mode; | |
376 | int i; | |
377 | ||
dc036d9e | 378 | mode = iface->current_mode; |
58b73e3d | 379 | |
8c9cb81f | 380 | for (i = 0; i < n_chans; i++) { |
58b73e3d | 381 | channel = &mode->channels[start_chan_idx + i]; |
b8058a69 JD |
382 | |
383 | if (channel->flag & HOSTAPD_CHAN_DISABLED) | |
384 | break; | |
385 | ||
386 | if (!(channel->flag & HOSTAPD_CHAN_RADAR)) | |
387 | continue; | |
388 | ||
58b73e3d JD |
389 | if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) != |
390 | HOSTAPD_CHAN_DFS_AVAILABLE) | |
391 | break; | |
392 | } | |
393 | ||
394 | return i == n_chans; | |
395 | } | |
396 | ||
397 | ||
398 | /* At least one channel unavailable */ | |
dc036d9e | 399 | static int dfs_check_chans_unavailable(struct hostapd_iface *iface, |
58b73e3d JD |
400 | int start_chan_idx, |
401 | int n_chans) | |
402 | { | |
403 | struct hostapd_channel_data *channel; | |
404 | struct hostapd_hw_modes *mode; | |
405 | int i, res = 0; | |
406 | ||
dc036d9e | 407 | mode = iface->current_mode; |
58b73e3d | 408 | |
8c9cb81f | 409 | for (i = 0; i < n_chans; i++) { |
58b73e3d JD |
410 | channel = &mode->channels[start_chan_idx + i]; |
411 | if (channel->flag & HOSTAPD_CHAN_DISABLED) | |
412 | res++; | |
413 | if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) == | |
414 | HOSTAPD_CHAN_DFS_UNAVAILABLE) | |
415 | res++; | |
416 | } | |
417 | ||
418 | return res; | |
419 | } | |
420 | ||
421 | ||
32595da6 | 422 | static struct hostapd_channel_data * |
dc036d9e | 423 | dfs_get_valid_channel(struct hostapd_iface *iface, |
32595da6 MK |
424 | int *secondary_channel, |
425 | u8 *vht_oper_centr_freq_seg0_idx, | |
b72f949b MK |
426 | u8 *vht_oper_centr_freq_seg1_idx, |
427 | int skip_radar) | |
e76da505 JD |
428 | { |
429 | struct hostapd_hw_modes *mode; | |
430 | struct hostapd_channel_data *chan = NULL; | |
32595da6 MK |
431 | int num_available_chandefs; |
432 | int chan_idx; | |
e76da505 JD |
433 | u32 _rand; |
434 | ||
435 | wpa_printf(MSG_DEBUG, "DFS: Selecting random channel"); | |
3d91a047 JM |
436 | *secondary_channel = 0; |
437 | *vht_oper_centr_freq_seg0_idx = 0; | |
438 | *vht_oper_centr_freq_seg1_idx = 0; | |
e76da505 | 439 | |
dc036d9e | 440 | if (iface->current_mode == NULL) |
e76da505 JD |
441 | return NULL; |
442 | ||
dc036d9e | 443 | mode = iface->current_mode; |
e76da505 JD |
444 | if (mode->mode != HOSTAPD_MODE_IEEE80211A) |
445 | return NULL; | |
446 | ||
32595da6 | 447 | /* Get the count first */ |
b72f949b | 448 | num_available_chandefs = dfs_find_channel(iface, NULL, 0, skip_radar); |
32595da6 MK |
449 | if (num_available_chandefs == 0) |
450 | return NULL; | |
e76da505 | 451 | |
7c0e5b58 | 452 | if (os_get_random((u8 *) &_rand, sizeof(_rand)) < 0) |
239952b4 | 453 | return NULL; |
32595da6 | 454 | chan_idx = _rand % num_available_chandefs; |
b72f949b | 455 | dfs_find_channel(iface, &chan, chan_idx, skip_radar); |
32595da6 MK |
456 | |
457 | /* dfs_find_channel() calculations assume HT40+ */ | |
dc036d9e | 458 | if (iface->conf->secondary_channel) |
32595da6 MK |
459 | *secondary_channel = 1; |
460 | else | |
461 | *secondary_channel = 0; | |
462 | ||
dc036d9e | 463 | dfs_adjust_vht_center_freq(iface, chan, |
eed65aad | 464 | *secondary_channel, |
32595da6 MK |
465 | vht_oper_centr_freq_seg0_idx, |
466 | vht_oper_centr_freq_seg1_idx); | |
58b73e3d | 467 | |
e76da505 JD |
468 | return chan; |
469 | } | |
470 | ||
471 | ||
dc036d9e | 472 | static int set_dfs_state_freq(struct hostapd_iface *iface, int freq, u32 state) |
e76da505 JD |
473 | { |
474 | struct hostapd_hw_modes *mode; | |
475 | struct hostapd_channel_data *chan = NULL; | |
476 | int i; | |
477 | ||
dc036d9e | 478 | mode = iface->current_mode; |
e76da505 JD |
479 | if (mode == NULL) |
480 | return 0; | |
481 | ||
58b73e3d | 482 | wpa_printf(MSG_DEBUG, "set_dfs_state 0x%X for %d MHz", state, freq); |
dc036d9e JM |
483 | for (i = 0; i < iface->current_mode->num_channels; i++) { |
484 | chan = &iface->current_mode->channels[i]; | |
e76da505 JD |
485 | if (chan->freq == freq) { |
486 | if (chan->flag & HOSTAPD_CHAN_RADAR) { | |
487 | chan->flag &= ~HOSTAPD_CHAN_DFS_MASK; | |
488 | chan->flag |= state; | |
489 | return 1; /* Channel found */ | |
490 | } | |
491 | } | |
492 | } | |
493 | wpa_printf(MSG_WARNING, "Can't set DFS state for freq %d MHz", freq); | |
494 | return 0; | |
495 | } | |
496 | ||
497 | ||
dc036d9e | 498 | static int set_dfs_state(struct hostapd_iface *iface, int freq, int ht_enabled, |
58b73e3d JD |
499 | int chan_offset, int chan_width, int cf1, |
500 | int cf2, u32 state) | |
501 | { | |
502 | int n_chans = 1, i; | |
503 | struct hostapd_hw_modes *mode; | |
504 | int frequency = freq; | |
505 | int ret = 0; | |
506 | ||
dc036d9e | 507 | mode = iface->current_mode; |
58b73e3d JD |
508 | if (mode == NULL) |
509 | return 0; | |
510 | ||
511 | if (mode->mode != HOSTAPD_MODE_IEEE80211A) { | |
512 | wpa_printf(MSG_WARNING, "current_mode != IEEE80211A"); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | /* Seems cf1 and chan_width is enough here */ | |
517 | switch (chan_width) { | |
518 | case CHAN_WIDTH_20_NOHT: | |
519 | case CHAN_WIDTH_20: | |
520 | n_chans = 1; | |
bb337dda JM |
521 | if (frequency == 0) |
522 | frequency = cf1; | |
58b73e3d JD |
523 | break; |
524 | case CHAN_WIDTH_40: | |
525 | n_chans = 2; | |
526 | frequency = cf1 - 10; | |
527 | break; | |
528 | case CHAN_WIDTH_80: | |
529 | n_chans = 4; | |
530 | frequency = cf1 - 30; | |
531 | break; | |
899cc14e JD |
532 | case CHAN_WIDTH_160: |
533 | n_chans = 8; | |
534 | frequency = cf1 - 70; | |
535 | break; | |
58b73e3d JD |
536 | default: |
537 | wpa_printf(MSG_INFO, "DFS chan_width %d not supported", | |
538 | chan_width); | |
539 | break; | |
540 | } | |
541 | ||
542 | wpa_printf(MSG_DEBUG, "DFS freq: %dMHz, n_chans: %d", frequency, | |
543 | n_chans); | |
544 | for (i = 0; i < n_chans; i++) { | |
dc036d9e | 545 | ret += set_dfs_state_freq(iface, frequency, state); |
58b73e3d JD |
546 | frequency = frequency + 20; |
547 | } | |
548 | ||
549 | return ret; | |
550 | } | |
551 | ||
552 | ||
dc036d9e | 553 | static int dfs_are_channels_overlapped(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
554 | int chan_width, int cf1, int cf2) |
555 | { | |
4a274f48 | 556 | int start_chan_idx, start_chan_idx1; |
58b73e3d JD |
557 | struct hostapd_hw_modes *mode; |
558 | struct hostapd_channel_data *chan; | |
4a274f48 | 559 | int n_chans, n_chans1, i, j, frequency = freq, radar_n_chans = 1; |
58b73e3d JD |
560 | u8 radar_chan; |
561 | int res = 0; | |
562 | ||
58b73e3d | 563 | /* Our configuration */ |
dc036d9e | 564 | mode = iface->current_mode; |
4a274f48 JM |
565 | start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1); |
566 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); | |
58b73e3d | 567 | |
5eaf240a | 568 | /* Check we are on DFS channel(s) */ |
dc036d9e | 569 | if (!dfs_check_chans_radar(iface, start_chan_idx, n_chans)) |
5eaf240a JD |
570 | return 0; |
571 | ||
58b73e3d JD |
572 | /* Reported via radar event */ |
573 | switch (chan_width) { | |
574 | case CHAN_WIDTH_20_NOHT: | |
575 | case CHAN_WIDTH_20: | |
576 | radar_n_chans = 1; | |
bb337dda JM |
577 | if (frequency == 0) |
578 | frequency = cf1; | |
58b73e3d JD |
579 | break; |
580 | case CHAN_WIDTH_40: | |
581 | radar_n_chans = 2; | |
582 | frequency = cf1 - 10; | |
583 | break; | |
584 | case CHAN_WIDTH_80: | |
585 | radar_n_chans = 4; | |
586 | frequency = cf1 - 30; | |
587 | break; | |
899cc14e JD |
588 | case CHAN_WIDTH_160: |
589 | radar_n_chans = 8; | |
590 | frequency = cf1 - 70; | |
591 | break; | |
58b73e3d JD |
592 | default: |
593 | wpa_printf(MSG_INFO, "DFS chan_width %d not supported", | |
594 | chan_width); | |
595 | break; | |
596 | } | |
597 | ||
598 | ieee80211_freq_to_chan(frequency, &radar_chan); | |
599 | ||
600 | for (i = 0; i < n_chans; i++) { | |
601 | chan = &mode->channels[start_chan_idx + i]; | |
5eaf240a JD |
602 | if (!(chan->flag & HOSTAPD_CHAN_RADAR)) |
603 | continue; | |
58b73e3d JD |
604 | for (j = 0; j < radar_n_chans; j++) { |
605 | wpa_printf(MSG_DEBUG, "checking our: %d, radar: %d", | |
606 | chan->chan, radar_chan + j * 4); | |
607 | if (chan->chan == radar_chan + j * 4) | |
608 | res++; | |
609 | } | |
610 | } | |
611 | ||
612 | wpa_printf(MSG_DEBUG, "overlapped: %d", res); | |
613 | ||
614 | return res; | |
615 | } | |
616 | ||
617 | ||
bbbacbf2 JD |
618 | static unsigned int dfs_get_cac_time(struct hostapd_iface *iface, |
619 | int start_chan_idx, int n_chans) | |
620 | { | |
621 | struct hostapd_channel_data *channel; | |
622 | struct hostapd_hw_modes *mode; | |
623 | int i; | |
624 | unsigned int cac_time_ms = 0; | |
625 | ||
626 | mode = iface->current_mode; | |
627 | ||
628 | for (i = 0; i < n_chans; i++) { | |
629 | channel = &mode->channels[start_chan_idx + i]; | |
630 | if (!(channel->flag & HOSTAPD_CHAN_RADAR)) | |
631 | continue; | |
632 | if (channel->dfs_cac_ms > cac_time_ms) | |
633 | cac_time_ms = channel->dfs_cac_ms; | |
634 | } | |
635 | ||
636 | return cac_time_ms; | |
637 | } | |
638 | ||
639 | ||
e76da505 JD |
640 | /* |
641 | * Main DFS handler | |
642 | * 1 - continue channel/ap setup | |
643 | * 0 - channel/ap setup will be continued after CAC | |
644 | * -1 - hit critical error | |
645 | */ | |
dc036d9e | 646 | int hostapd_handle_dfs(struct hostapd_iface *iface) |
e76da505 | 647 | { |
e76da505 | 648 | struct hostapd_channel_data *channel; |
4a274f48 | 649 | int res, n_chans, n_chans1, start_chan_idx, start_chan_idx1; |
b72f949b | 650 | int skip_radar = 0; |
58b73e3d | 651 | |
afbe57d9 JM |
652 | if (!iface->current_mode) { |
653 | /* | |
654 | * This can happen with drivers that do not provide mode | |
655 | * information and as such, cannot really use hostapd for DFS. | |
656 | */ | |
657 | wpa_printf(MSG_DEBUG, | |
658 | "DFS: No current_mode information - assume no need to perform DFS operations by hostapd"); | |
659 | return 1; | |
660 | } | |
661 | ||
dc036d9e | 662 | iface->cac_started = 0; |
954e71d2 | 663 | |
58b73e3d JD |
664 | do { |
665 | /* Get start (first) channel for current configuration */ | |
4a274f48 JM |
666 | start_chan_idx = dfs_get_start_chan_idx(iface, |
667 | &start_chan_idx1); | |
58b73e3d JD |
668 | if (start_chan_idx == -1) |
669 | return -1; | |
670 | ||
671 | /* Get number of used channels, depend on width */ | |
4a274f48 | 672 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); |
58b73e3d | 673 | |
bbbacbf2 JD |
674 | /* Setup CAC time */ |
675 | iface->dfs_cac_ms = dfs_get_cac_time(iface, start_chan_idx, | |
676 | n_chans); | |
677 | ||
58b73e3d | 678 | /* Check if any of configured channels require DFS */ |
dc036d9e | 679 | res = dfs_check_chans_radar(iface, start_chan_idx, n_chans); |
58b73e3d JD |
680 | wpa_printf(MSG_DEBUG, |
681 | "DFS %d channels required radar detection", | |
682 | res); | |
683 | if (!res) | |
684 | return 1; | |
685 | ||
686 | /* Check if all channels are DFS available */ | |
dc036d9e | 687 | res = dfs_check_chans_available(iface, start_chan_idx, n_chans); |
58b73e3d JD |
688 | wpa_printf(MSG_DEBUG, |
689 | "DFS all channels available, (SKIP CAC): %s", | |
690 | res ? "yes" : "no"); | |
691 | if (res) | |
692 | return 1; | |
693 | ||
694 | /* Check if any of configured channels is unavailable */ | |
dc036d9e | 695 | res = dfs_check_chans_unavailable(iface, start_chan_idx, |
58b73e3d JD |
696 | n_chans); |
697 | wpa_printf(MSG_DEBUG, "DFS %d chans unavailable - choose other channel: %s", | |
698 | res, res ? "yes": "no"); | |
699 | if (res) { | |
5479ff90 MS |
700 | int sec = 0; |
701 | u8 cf1 = 0, cf2 = 0; | |
32595da6 | 702 | |
b72f949b MK |
703 | channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2, |
704 | skip_radar); | |
e76da505 JD |
705 | if (!channel) { |
706 | wpa_printf(MSG_ERROR, "could not get valid channel"); | |
3bd58861 ZK |
707 | hostapd_set_state(iface, HAPD_IFACE_DFS); |
708 | return 0; | |
e76da505 | 709 | } |
32595da6 | 710 | |
dc036d9e JM |
711 | iface->freq = channel->freq; |
712 | iface->conf->channel = channel->chan; | |
713 | iface->conf->secondary_channel = sec; | |
714 | iface->conf->vht_oper_centr_freq_seg0_idx = cf1; | |
715 | iface->conf->vht_oper_centr_freq_seg1_idx = cf2; | |
e76da505 | 716 | } |
58b73e3d JD |
717 | } while (res); |
718 | ||
719 | /* Finally start CAC */ | |
dc036d9e JM |
720 | hostapd_set_state(iface, HAPD_IFACE_DFS); |
721 | wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz", iface->freq); | |
722 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START | |
bbbacbf2 | 723 | "freq=%d chan=%d sec_chan=%d, width=%d, seg0=%d, seg1=%d, cac_time=%ds", |
dc036d9e | 724 | iface->freq, |
1f374834 JD |
725 | iface->conf->channel, iface->conf->secondary_channel, |
726 | iface->conf->vht_oper_chwidth, | |
727 | iface->conf->vht_oper_centr_freq_seg0_idx, | |
bbbacbf2 JD |
728 | iface->conf->vht_oper_centr_freq_seg1_idx, |
729 | iface->dfs_cac_ms / 1000); | |
1f374834 JD |
730 | |
731 | res = hostapd_start_dfs_cac(iface, iface->conf->hw_mode, | |
732 | iface->freq, | |
733 | iface->conf->channel, | |
734 | iface->conf->ieee80211n, | |
735 | iface->conf->ieee80211ac, | |
736 | iface->conf->secondary_channel, | |
737 | iface->conf->vht_oper_chwidth, | |
738 | iface->conf->vht_oper_centr_freq_seg0_idx, | |
739 | iface->conf->vht_oper_centr_freq_seg1_idx); | |
740 | ||
741 | if (res) { | |
742 | wpa_printf(MSG_ERROR, "DFS start_dfs_cac() failed, %d", res); | |
58b73e3d | 743 | return -1; |
e76da505 JD |
744 | } |
745 | ||
58b73e3d | 746 | return 0; |
e76da505 JD |
747 | } |
748 | ||
749 | ||
3dcd735c VT |
750 | static int hostapd_config_dfs_chan_available(struct hostapd_iface *iface) |
751 | { | |
752 | int n_chans, n_chans1, start_chan_idx, start_chan_idx1; | |
753 | ||
754 | /* Get the start (first) channel for current configuration */ | |
755 | start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1); | |
756 | if (start_chan_idx < 0) | |
757 | return 0; | |
758 | ||
759 | /* Get the number of used channels, depending on width */ | |
760 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); | |
761 | ||
762 | /* Check if all channels are DFS available */ | |
763 | return dfs_check_chans_available(iface, start_chan_idx, n_chans); | |
764 | } | |
765 | ||
766 | ||
dc036d9e | 767 | int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq, |
58b73e3d JD |
768 | int ht_enabled, int chan_offset, int chan_width, |
769 | int cf1, int cf2) | |
e76da505 | 770 | { |
dc036d9e | 771 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_COMPLETED |
186c9059 JM |
772 | "success=%d freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
773 | success, freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
774 | ||
e76da505 JD |
775 | if (success) { |
776 | /* Complete iface/ap configuration */ | |
5de81d7a AK |
777 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) { |
778 | /* Complete AP configuration for the first bring up. */ | |
779 | if (iface->state != HAPD_IFACE_ENABLED) | |
780 | hostapd_setup_interface_complete(iface, 0); | |
781 | else | |
782 | iface->cac_started = 0; | |
783 | } else { | |
784 | set_dfs_state(iface, freq, ht_enabled, chan_offset, | |
785 | chan_width, cf1, cf2, | |
786 | HOSTAPD_CHAN_DFS_AVAILABLE); | |
3dcd735c VT |
787 | /* |
788 | * Just mark the channel available when CAC completion | |
789 | * event is received in enabled state. CAC result could | |
790 | * have been propagated from another radio having the | |
791 | * same regulatory configuration. When CAC completion is | |
792 | * received during non-HAPD_IFACE_ENABLED state, make | |
793 | * sure the configured channel is available because this | |
794 | * CAC completion event could have been propagated from | |
795 | * another radio. | |
796 | */ | |
797 | if (iface->state != HAPD_IFACE_ENABLED && | |
798 | hostapd_config_dfs_chan_available(iface)) { | |
799 | hostapd_setup_interface_complete(iface, 0); | |
800 | iface->cac_started = 0; | |
801 | } | |
5de81d7a | 802 | } |
e76da505 JD |
803 | } |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
808 | ||
7cbb5f1a VT |
809 | int hostapd_dfs_pre_cac_expired(struct hostapd_iface *iface, int freq, |
810 | int ht_enabled, int chan_offset, int chan_width, | |
811 | int cf1, int cf2) | |
812 | { | |
813 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_PRE_CAC_EXPIRED | |
814 | "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", | |
815 | freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
816 | ||
817 | /* Proceed only if DFS is not offloaded to the driver */ | |
818 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) | |
819 | return 0; | |
820 | ||
821 | set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width, | |
822 | cf1, cf2, HOSTAPD_CHAN_DFS_USABLE); | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | ||
f7154cee | 828 | static int hostapd_dfs_start_channel_switch_cac(struct hostapd_iface *iface) |
e76da505 JD |
829 | { |
830 | struct hostapd_channel_data *channel; | |
f7154cee | 831 | int secondary_channel; |
5479ff90 MS |
832 | u8 vht_oper_centr_freq_seg0_idx = 0; |
833 | u8 vht_oper_centr_freq_seg1_idx = 0; | |
f7154cee | 834 | int skip_radar = 0; |
e76da505 | 835 | int err = 1; |
f7154cee JD |
836 | |
837 | /* Radar detected during active CAC */ | |
838 | iface->cac_started = 0; | |
839 | channel = dfs_get_valid_channel(iface, &secondary_channel, | |
840 | &vht_oper_centr_freq_seg0_idx, | |
841 | &vht_oper_centr_freq_seg1_idx, | |
842 | skip_radar); | |
843 | ||
844 | if (!channel) { | |
845 | wpa_printf(MSG_ERROR, "No valid channel available"); | |
f7154cee JD |
846 | return err; |
847 | } | |
848 | ||
849 | wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d", | |
850 | channel->chan); | |
851 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL | |
852 | "freq=%d chan=%d sec_chan=%d", channel->freq, | |
853 | channel->chan, secondary_channel); | |
854 | ||
855 | iface->freq = channel->freq; | |
856 | iface->conf->channel = channel->chan; | |
857 | iface->conf->secondary_channel = secondary_channel; | |
858 | iface->conf->vht_oper_centr_freq_seg0_idx = | |
859 | vht_oper_centr_freq_seg0_idx; | |
860 | iface->conf->vht_oper_centr_freq_seg1_idx = | |
861 | vht_oper_centr_freq_seg1_idx; | |
862 | err = 0; | |
863 | ||
864 | hostapd_setup_interface_complete(iface, err); | |
865 | return err; | |
866 | } | |
867 | ||
868 | ||
869 | static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface) | |
870 | { | |
871 | struct hostapd_channel_data *channel; | |
32595da6 MK |
872 | int secondary_channel; |
873 | u8 vht_oper_centr_freq_seg0_idx; | |
874 | u8 vht_oper_centr_freq_seg1_idx; | |
b72f949b | 875 | int skip_radar = 1; |
f7154cee | 876 | struct csa_settings csa_settings; |
8974620e | 877 | unsigned int i; |
f7154cee JD |
878 | int err = 1; |
879 | ||
25592b23 JD |
880 | wpa_printf(MSG_DEBUG, "%s called (CAC active: %s, CSA active: %s)", |
881 | __func__, iface->cac_started ? "yes" : "no", | |
6782b684 | 882 | hostapd_csa_in_progress(iface) ? "yes" : "no"); |
25592b23 JD |
883 | |
884 | /* Check if CSA in progress */ | |
6782b684 | 885 | if (hostapd_csa_in_progress(iface)) |
25592b23 | 886 | return 0; |
f7154cee JD |
887 | |
888 | /* Check if active CAC */ | |
889 | if (iface->cac_started) | |
890 | return hostapd_dfs_start_channel_switch_cac(iface); | |
e76da505 | 891 | |
04f667fc VT |
892 | /* |
893 | * Allow selection of DFS channel in ETSI to comply with | |
894 | * uniform spreading. | |
895 | */ | |
896 | if (iface->dfs_domain == HOSTAPD_DFS_REGION_ETSI) | |
897 | skip_radar = 0; | |
898 | ||
f7154cee | 899 | /* Perform channel switch/CSA */ |
dc036d9e | 900 | channel = dfs_get_valid_channel(iface, &secondary_channel, |
32595da6 | 901 | &vht_oper_centr_freq_seg0_idx, |
b72f949b MK |
902 | &vht_oper_centr_freq_seg1_idx, |
903 | skip_radar); | |
813d4bac | 904 | |
f7154cee | 905 | if (!channel) { |
e0700512 SW |
906 | /* |
907 | * If there is no channel to switch immediately to, check if | |
908 | * there is another channel where we can switch even if it | |
909 | * requires to perform a CAC first. | |
910 | */ | |
911 | skip_radar = 0; | |
912 | channel = dfs_get_valid_channel(iface, &secondary_channel, | |
913 | &vht_oper_centr_freq_seg0_idx, | |
914 | &vht_oper_centr_freq_seg1_idx, | |
915 | skip_radar); | |
916 | if (!channel) { | |
3bd58861 ZK |
917 | wpa_printf(MSG_INFO, |
918 | "%s: no DFS channels left, waiting for NOP to finish", | |
919 | __func__); | |
e0700512 SW |
920 | return err; |
921 | } | |
922 | ||
923 | iface->freq = channel->freq; | |
924 | iface->conf->channel = channel->chan; | |
925 | iface->conf->secondary_channel = secondary_channel; | |
926 | iface->conf->vht_oper_centr_freq_seg0_idx = | |
927 | vht_oper_centr_freq_seg0_idx; | |
928 | iface->conf->vht_oper_centr_freq_seg1_idx = | |
929 | vht_oper_centr_freq_seg1_idx; | |
930 | ||
f7154cee | 931 | hostapd_disable_iface(iface); |
e0700512 SW |
932 | hostapd_enable_iface(iface); |
933 | return 0; | |
f7154cee JD |
934 | } |
935 | ||
936 | wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d", | |
937 | channel->chan); | |
938 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL | |
939 | "freq=%d chan=%d sec_chan=%d", channel->freq, | |
940 | channel->chan, secondary_channel); | |
941 | ||
942 | /* Setup CSA request */ | |
943 | os_memset(&csa_settings, 0, sizeof(csa_settings)); | |
944 | csa_settings.cs_count = 5; | |
945 | csa_settings.block_tx = 1; | |
946 | err = hostapd_set_freq_params(&csa_settings.freq_params, | |
947 | iface->conf->hw_mode, | |
948 | channel->freq, | |
949 | channel->chan, | |
950 | iface->conf->ieee80211n, | |
951 | iface->conf->ieee80211ac, | |
952 | secondary_channel, | |
953 | iface->conf->vht_oper_chwidth, | |
954 | vht_oper_centr_freq_seg0_idx, | |
955 | vht_oper_centr_freq_seg1_idx, | |
956 | iface->current_mode->vht_capab); | |
957 | ||
958 | if (err) { | |
959 | wpa_printf(MSG_ERROR, "DFS failed to calculate CSA freq params"); | |
960 | hostapd_disable_iface(iface); | |
961 | return err; | |
962 | } | |
963 | ||
8974620e MK |
964 | for (i = 0; i < iface->num_bss; i++) { |
965 | err = hostapd_switch_channel(iface->bss[i], &csa_settings); | |
966 | if (err) | |
967 | break; | |
968 | } | |
969 | ||
f7154cee JD |
970 | if (err) { |
971 | wpa_printf(MSG_WARNING, "DFS failed to schedule CSA (%d) - trying fallback", | |
972 | err); | |
dc036d9e JM |
973 | iface->freq = channel->freq; |
974 | iface->conf->channel = channel->chan; | |
975 | iface->conf->secondary_channel = secondary_channel; | |
976 | iface->conf->vht_oper_centr_freq_seg0_idx = | |
977 | vht_oper_centr_freq_seg0_idx; | |
978 | iface->conf->vht_oper_centr_freq_seg1_idx = | |
979 | vht_oper_centr_freq_seg1_idx; | |
813d4bac | 980 | |
dc036d9e | 981 | hostapd_disable_iface(iface); |
f7154cee JD |
982 | hostapd_enable_iface(iface); |
983 | return 0; | |
2e946249 | 984 | } |
e76da505 | 985 | |
f7154cee JD |
986 | /* Channel configuration will be updated once CSA completes and |
987 | * ch_switch_notify event is received */ | |
988 | ||
989 | wpa_printf(MSG_DEBUG, "DFS waiting channel switch event"); | |
e76da505 JD |
990 | return 0; |
991 | } | |
58b73e3d JD |
992 | |
993 | ||
dc036d9e | 994 | int hostapd_dfs_radar_detected(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
995 | int ht_enabled, int chan_offset, int chan_width, |
996 | int cf1, int cf2) | |
997 | { | |
998 | int res; | |
999 | ||
dc036d9e | 1000 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_RADAR_DETECTED |
186c9059 JM |
1001 | "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
1002 | freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
1003 | ||
5de81d7a AK |
1004 | /* Proceed only if DFS is not offloaded to the driver */ |
1005 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) | |
1006 | return 0; | |
1007 | ||
1008 | if (!iface->conf->ieee80211h) | |
1009 | return 0; | |
1010 | ||
58b73e3d | 1011 | /* mark radar frequency as invalid */ |
c0e46bb7 JM |
1012 | set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width, |
1013 | cf1, cf2, HOSTAPD_CHAN_DFS_UNAVAILABLE); | |
58b73e3d JD |
1014 | |
1015 | /* Skip if reported radar event not overlapped our channels */ | |
dc036d9e | 1016 | res = dfs_are_channels_overlapped(iface, freq, chan_width, cf1, cf2); |
58b73e3d JD |
1017 | if (!res) |
1018 | return 0; | |
1019 | ||
58b73e3d | 1020 | /* radar detected while operating, switch the channel. */ |
dc036d9e | 1021 | res = hostapd_dfs_start_channel_switch(iface); |
58b73e3d JD |
1022 | |
1023 | return res; | |
1024 | } | |
1025 | ||
1026 | ||
dc036d9e | 1027 | int hostapd_dfs_nop_finished(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
1028 | int ht_enabled, int chan_offset, int chan_width, |
1029 | int cf1, int cf2) | |
1030 | { | |
dc036d9e | 1031 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NOP_FINISHED |
186c9059 JM |
1032 | "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
1033 | freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
5de81d7a AK |
1034 | |
1035 | /* Proceed only if DFS is not offloaded to the driver */ | |
1036 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) | |
1037 | return 0; | |
1038 | ||
58b73e3d | 1039 | /* TODO add correct implementation here */ |
dc036d9e JM |
1040 | set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width, |
1041 | cf1, cf2, HOSTAPD_CHAN_DFS_USABLE); | |
3bd58861 ZK |
1042 | |
1043 | /* Handle cases where all channels were initially unavailable */ | |
1044 | if (iface->state == HAPD_IFACE_DFS && !iface->cac_started) | |
1045 | hostapd_handle_dfs(iface); | |
1046 | ||
58b73e3d JD |
1047 | return 0; |
1048 | } | |
3d7ad2f6 C |
1049 | |
1050 | ||
1051 | int hostapd_is_dfs_required(struct hostapd_iface *iface) | |
1052 | { | |
4a274f48 | 1053 | int n_chans, n_chans1, start_chan_idx, start_chan_idx1, res; |
3d7ad2f6 | 1054 | |
8a0f3bf6 MP |
1055 | if (!iface->conf->ieee80211h || !iface->current_mode || |
1056 | iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A) | |
1057 | return 0; | |
3d7ad2f6 C |
1058 | |
1059 | /* Get start (first) channel for current configuration */ | |
4a274f48 | 1060 | start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1); |
3d7ad2f6 C |
1061 | if (start_chan_idx == -1) |
1062 | return -1; | |
1063 | ||
1064 | /* Get number of used channels, depend on width */ | |
4a274f48 | 1065 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); |
3d7ad2f6 C |
1066 | |
1067 | /* Check if any of configured channels require DFS */ | |
4a274f48 JM |
1068 | res = dfs_check_chans_radar(iface, start_chan_idx, n_chans); |
1069 | if (res) | |
1070 | return res; | |
1071 | if (start_chan_idx1 >= 0 && n_chans1 > 0) | |
1072 | res = dfs_check_chans_radar(iface, start_chan_idx1, n_chans1); | |
1073 | return res; | |
3d7ad2f6 | 1074 | } |
c13578c3 AK |
1075 | |
1076 | ||
1077 | int hostapd_dfs_start_cac(struct hostapd_iface *iface, int freq, | |
1078 | int ht_enabled, int chan_offset, int chan_width, | |
1079 | int cf1, int cf2) | |
1080 | { | |
1081 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START | |
1082 | "freq=%d chan=%d chan_offset=%d width=%d seg0=%d " | |
1083 | "seg1=%d cac_time=%ds", | |
1084 | freq, (freq - 5000) / 5, chan_offset, chan_width, cf1, cf2, 60); | |
1085 | iface->cac_started = 1; | |
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | ||
1090 | /* | |
1091 | * Main DFS handler for offloaded case. | |
1092 | * 2 - continue channel/AP setup for non-DFS channel | |
1093 | * 1 - continue channel/AP setup for DFS channel | |
1094 | * 0 - channel/AP setup will be continued after CAC | |
1095 | * -1 - hit critical error | |
1096 | */ | |
1097 | int hostapd_handle_dfs_offload(struct hostapd_iface *iface) | |
1098 | { | |
1099 | wpa_printf(MSG_DEBUG, "%s: iface->cac_started: %d", | |
1100 | __func__, iface->cac_started); | |
1101 | ||
1102 | /* | |
1103 | * If DFS has already been started, then we are being called from a | |
1104 | * callback to continue AP/channel setup. Reset the CAC start flag and | |
1105 | * return. | |
1106 | */ | |
1107 | if (iface->cac_started) { | |
1108 | wpa_printf(MSG_DEBUG, "%s: iface->cac_started: %d", | |
1109 | __func__, iface->cac_started); | |
1110 | iface->cac_started = 0; | |
1111 | return 1; | |
1112 | } | |
1113 | ||
1114 | if (ieee80211_is_dfs(iface->freq)) { | |
1115 | wpa_printf(MSG_DEBUG, "%s: freq %d MHz requires DFS", | |
1116 | __func__, iface->freq); | |
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | wpa_printf(MSG_DEBUG, | |
1121 | "%s: freq %d MHz does not require DFS. Continue channel/AP setup", | |
1122 | __func__, iface->freq); | |
1123 | return 2; | |
1124 | } |