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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 | ||
958cb348 | 31 | if (iface->conf->ieee80211ac || iface->conf->ieee80211ax) { |
c6b7ac07 | 32 | switch (hostapd_get_oper_chwidth(iface->conf)) { |
464dcfd0 | 33 | case CHANWIDTH_USE_HT: |
58b73e3d | 34 | break; |
464dcfd0 | 35 | case CHANWIDTH_80MHZ: |
58b73e3d JD |
36 | n_chans = 4; |
37 | break; | |
464dcfd0 | 38 | case CHANWIDTH_160MHZ: |
899cc14e JD |
39 | n_chans = 8; |
40 | break; | |
464dcfd0 | 41 | case CHANWIDTH_80P80MHZ: |
4a274f48 JM |
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; | |
59bf0f97 | 145 | u32 bw = num_chan_to_bw(num_chans); |
6a398ddc | 146 | |
8f89e57a JM |
147 | if (first_chan_idx + num_chans > mode->num_channels) { |
148 | wpa_printf(MSG_DEBUG, | |
149 | "DFS: some channels in range not defined"); | |
6a398ddc | 150 | return 0; |
8f89e57a | 151 | } |
6a398ddc MK |
152 | |
153 | first_chan = &mode->channels[first_chan_idx]; | |
154 | ||
59bf0f97 DL |
155 | /* hostapd DFS implementation assumes the first channel as primary. |
156 | * If it's not allowed to use the first channel as primary, decline the | |
157 | * whole channel range. */ | |
8f89e57a JM |
158 | if (!chan_pri_allowed(first_chan)) { |
159 | wpa_printf(MSG_DEBUG, "DFS: primary chanenl not allowed"); | |
59bf0f97 | 160 | return 0; |
8f89e57a | 161 | } |
59bf0f97 | 162 | |
6a398ddc | 163 | for (i = 0; i < num_chans; i++) { |
56ef9925 EP |
164 | chan = dfs_get_chan_data(mode, first_chan->freq + i * 20, |
165 | first_chan_idx); | |
8f89e57a JM |
166 | if (!chan) { |
167 | wpa_printf(MSG_DEBUG, "DFS: no channel data for %d", | |
168 | first_chan->freq + i * 20); | |
6a398ddc | 169 | return 0; |
8f89e57a | 170 | } |
6a398ddc | 171 | |
59bf0f97 DL |
172 | /* HT 40 MHz secondary channel availability checked only for |
173 | * primary channel */ | |
8f89e57a JM |
174 | if (!chan_bw_allowed(chan, bw, 1, !i)) { |
175 | wpa_printf(MSG_DEBUG, "DFS: bw now allowed for %d", | |
176 | first_chan->freq + i * 20); | |
59bf0f97 | 177 | return 0; |
8f89e57a | 178 | } |
59bf0f97 | 179 | |
8f89e57a JM |
180 | if (!dfs_channel_available(chan, skip_radar)) { |
181 | wpa_printf(MSG_DEBUG, "DFS: channel not available %d", | |
182 | first_chan->freq + i * 20); | |
6a398ddc | 183 | return 0; |
8f89e57a | 184 | } |
6a398ddc MK |
185 | } |
186 | ||
187 | return 1; | |
188 | } | |
189 | ||
190 | ||
70ee1be2 SW |
191 | static int is_in_chanlist(struct hostapd_iface *iface, |
192 | struct hostapd_channel_data *chan) | |
193 | { | |
857d9422 | 194 | if (!iface->conf->acs_ch_list.num) |
70ee1be2 SW |
195 | return 1; |
196 | ||
857d9422 | 197 | return freq_range_list_includes(&iface->conf->acs_ch_list, chan->chan); |
70ee1be2 SW |
198 | } |
199 | ||
200 | ||
32595da6 MK |
201 | /* |
202 | * The function assumes HT40+ operation. | |
203 | * Make sure to adjust the following variables after calling this: | |
204 | * - hapd->secondary_channel | |
c6b7ac07 JC |
205 | * - hapd->vht/he_oper_centr_freq_seg0_idx |
206 | * - hapd->vht/he_oper_centr_freq_seg1_idx | |
32595da6 | 207 | */ |
dc036d9e | 208 | static int dfs_find_channel(struct hostapd_iface *iface, |
6de0e0c9 | 209 | struct hostapd_channel_data **ret_chan, |
b72f949b | 210 | int idx, int skip_radar) |
e76da505 JD |
211 | { |
212 | struct hostapd_hw_modes *mode; | |
6a398ddc | 213 | struct hostapd_channel_data *chan; |
4a274f48 | 214 | int i, channel_idx = 0, n_chans, n_chans1; |
e76da505 | 215 | |
dc036d9e | 216 | mode = iface->current_mode; |
4a274f48 | 217 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); |
e76da505 | 218 | |
58b73e3d | 219 | wpa_printf(MSG_DEBUG, "DFS new chan checking %d channels", n_chans); |
e76da505 JD |
220 | for (i = 0; i < mode->num_channels; i++) { |
221 | chan = &mode->channels[i]; | |
222 | ||
6a398ddc | 223 | /* Skip HT40/VHT incompatible channels */ |
dc036d9e JM |
224 | if (iface->conf->ieee80211n && |
225 | iface->conf->secondary_channel && | |
59bf0f97 | 226 | (!dfs_is_chan_allowed(chan, n_chans) || |
8f89e57a JM |
227 | !(chan->allowed_bw & HOSTAPD_CHAN_WIDTH_40P))) { |
228 | wpa_printf(MSG_DEBUG, | |
229 | "DFS: channel %d (%d) is incompatible", | |
230 | chan->freq, chan->chan); | |
e76da505 | 231 | continue; |
8f89e57a | 232 | } |
e76da505 | 233 | |
6a398ddc | 234 | /* Skip incompatible chandefs */ |
8f89e57a JM |
235 | if (!dfs_chan_range_available(mode, i, n_chans, skip_radar)) { |
236 | wpa_printf(MSG_DEBUG, | |
237 | "DFS: range not available for %d (%d)", | |
238 | chan->freq, chan->chan); | |
6a398ddc | 239 | continue; |
8f89e57a | 240 | } |
e76da505 | 241 | |
8f89e57a JM |
242 | if (!is_in_chanlist(iface, chan)) { |
243 | wpa_printf(MSG_DEBUG, | |
244 | "DFS: channel %d (%d) not in chanlist", | |
245 | chan->freq, chan->chan); | |
70ee1be2 | 246 | continue; |
8f89e57a | 247 | } |
70ee1be2 | 248 | |
e76da505 | 249 | if (ret_chan && idx == channel_idx) { |
8f89e57a JM |
250 | wpa_printf(MSG_DEBUG, "Selected channel %d (%d)", |
251 | chan->freq, chan->chan); | |
e76da505 JD |
252 | *ret_chan = chan; |
253 | return idx; | |
254 | } | |
8f89e57a JM |
255 | wpa_printf(MSG_DEBUG, "Adding channel %d (%d)", |
256 | chan->freq, chan->chan); | |
e76da505 JD |
257 | channel_idx++; |
258 | } | |
259 | return channel_idx; | |
260 | } | |
261 | ||
262 | ||
7118a697 JC |
263 | static void dfs_adjust_center_freq(struct hostapd_iface *iface, |
264 | struct hostapd_channel_data *chan, | |
265 | int secondary_channel, | |
f64b601c | 266 | int sec_chan_idx_80p80, |
7118a697 JC |
267 | u8 *oper_centr_freq_seg0_idx, |
268 | u8 *oper_centr_freq_seg1_idx) | |
58b73e3d | 269 | { |
958cb348 | 270 | if (!iface->conf->ieee80211ac && !iface->conf->ieee80211ax) |
58b73e3d JD |
271 | return; |
272 | ||
273 | if (!chan) | |
274 | return; | |
275 | ||
7118a697 | 276 | *oper_centr_freq_seg1_idx = 0; |
32595da6 | 277 | |
c6b7ac07 | 278 | switch (hostapd_get_oper_chwidth(iface->conf)) { |
464dcfd0 | 279 | case CHANWIDTH_USE_HT: |
eed65aad | 280 | if (secondary_channel == 1) |
7118a697 | 281 | *oper_centr_freq_seg0_idx = chan->chan + 2; |
eed65aad | 282 | else if (secondary_channel == -1) |
7118a697 | 283 | *oper_centr_freq_seg0_idx = chan->chan - 2; |
345276a6 | 284 | else |
7118a697 | 285 | *oper_centr_freq_seg0_idx = chan->chan; |
58b73e3d | 286 | break; |
464dcfd0 | 287 | case CHANWIDTH_80MHZ: |
7118a697 | 288 | *oper_centr_freq_seg0_idx = chan->chan + 6; |
58b73e3d | 289 | break; |
464dcfd0 | 290 | case CHANWIDTH_160MHZ: |
7118a697 | 291 | *oper_centr_freq_seg0_idx = chan->chan + 14; |
35f83637 | 292 | break; |
f64b601c PKP |
293 | case CHANWIDTH_80P80MHZ: |
294 | *oper_centr_freq_seg0_idx = chan->chan + 6; | |
295 | *oper_centr_freq_seg1_idx = sec_chan_idx_80p80 + 6; | |
296 | break; | |
297 | ||
58b73e3d | 298 | default: |
f64b601c PKP |
299 | wpa_printf(MSG_INFO, |
300 | "DFS: Unsupported channel width configuration"); | |
7118a697 | 301 | *oper_centr_freq_seg0_idx = 0; |
58b73e3d JD |
302 | break; |
303 | } | |
304 | ||
32595da6 | 305 | wpa_printf(MSG_DEBUG, "DFS adjusting VHT center frequency: %d, %d", |
7118a697 JC |
306 | *oper_centr_freq_seg0_idx, |
307 | *oper_centr_freq_seg1_idx); | |
58b73e3d JD |
308 | } |
309 | ||
310 | ||
311 | /* Return start channel idx we will use for mode->channels[idx] */ | |
4a274f48 | 312 | static int dfs_get_start_chan_idx(struct hostapd_iface *iface, int *seg1_start) |
58b73e3d JD |
313 | { |
314 | struct hostapd_hw_modes *mode; | |
315 | struct hostapd_channel_data *chan; | |
dc036d9e | 316 | int channel_no = iface->conf->channel; |
58b73e3d | 317 | int res = -1, i; |
4a274f48 JM |
318 | int chan_seg1 = -1; |
319 | ||
320 | *seg1_start = -1; | |
58b73e3d JD |
321 | |
322 | /* HT40- */ | |
dc036d9e | 323 | if (iface->conf->ieee80211n && iface->conf->secondary_channel == -1) |
58b73e3d JD |
324 | channel_no -= 4; |
325 | ||
958cb348 JC |
326 | /* VHT/HE */ |
327 | if (iface->conf->ieee80211ac || iface->conf->ieee80211ax) { | |
c6b7ac07 | 328 | switch (hostapd_get_oper_chwidth(iface->conf)) { |
464dcfd0 | 329 | case CHANWIDTH_USE_HT: |
58b73e3d | 330 | break; |
464dcfd0 | 331 | case CHANWIDTH_80MHZ: |
c6b7ac07 JC |
332 | channel_no = hostapd_get_oper_centr_freq_seg0_idx( |
333 | iface->conf) - 6; | |
58b73e3d | 334 | break; |
464dcfd0 | 335 | case CHANWIDTH_160MHZ: |
c6b7ac07 JC |
336 | channel_no = hostapd_get_oper_centr_freq_seg0_idx( |
337 | iface->conf) - 14; | |
899cc14e | 338 | break; |
464dcfd0 | 339 | case CHANWIDTH_80P80MHZ: |
c6b7ac07 JC |
340 | channel_no = hostapd_get_oper_centr_freq_seg0_idx( |
341 | iface->conf) - 6; | |
342 | chan_seg1 = hostapd_get_oper_centr_freq_seg1_idx( | |
343 | iface->conf) - 6; | |
4a274f48 | 344 | break; |
58b73e3d JD |
345 | default: |
346 | wpa_printf(MSG_INFO, | |
4a274f48 | 347 | "DFS only VHT20/40/80/160/80+80 is supported now"); |
58b73e3d JD |
348 | channel_no = -1; |
349 | break; | |
350 | } | |
351 | } | |
352 | ||
353 | /* Get idx */ | |
dc036d9e | 354 | mode = iface->current_mode; |
58b73e3d JD |
355 | for (i = 0; i < mode->num_channels; i++) { |
356 | chan = &mode->channels[i]; | |
357 | if (chan->chan == channel_no) { | |
358 | res = i; | |
359 | break; | |
360 | } | |
361 | } | |
362 | ||
4a274f48 JM |
363 | if (res != -1 && chan_seg1 > -1) { |
364 | int found = 0; | |
365 | ||
366 | /* Get idx for seg1 */ | |
367 | mode = iface->current_mode; | |
368 | for (i = 0; i < mode->num_channels; i++) { | |
369 | chan = &mode->channels[i]; | |
370 | if (chan->chan == chan_seg1) { | |
371 | *seg1_start = i; | |
372 | found = 1; | |
373 | break; | |
374 | } | |
375 | } | |
376 | if (!found) | |
377 | res = -1; | |
378 | } | |
379 | ||
7450c128 BG |
380 | if (res == -1) { |
381 | wpa_printf(MSG_DEBUG, | |
382 | "DFS chan_idx seems wrong; num-ch: %d ch-no: %d conf-ch-no: %d 11n: %d sec-ch: %d vht-oper-width: %d", | |
383 | mode->num_channels, channel_no, iface->conf->channel, | |
384 | iface->conf->ieee80211n, | |
385 | iface->conf->secondary_channel, | |
c6b7ac07 | 386 | hostapd_get_oper_chwidth(iface->conf)); |
7450c128 BG |
387 | |
388 | for (i = 0; i < mode->num_channels; i++) { | |
389 | wpa_printf(MSG_DEBUG, "Available channel: %d", | |
390 | mode->channels[i].chan); | |
391 | } | |
392 | } | |
58b73e3d JD |
393 | |
394 | return res; | |
395 | } | |
396 | ||
397 | ||
398 | /* At least one channel have radar flag */ | |
dc036d9e JM |
399 | static int dfs_check_chans_radar(struct hostapd_iface *iface, |
400 | int start_chan_idx, int n_chans) | |
58b73e3d JD |
401 | { |
402 | struct hostapd_channel_data *channel; | |
403 | struct hostapd_hw_modes *mode; | |
404 | int i, res = 0; | |
405 | ||
dc036d9e | 406 | mode = iface->current_mode; |
58b73e3d JD |
407 | |
408 | for (i = 0; i < n_chans; i++) { | |
409 | channel = &mode->channels[start_chan_idx + i]; | |
410 | if (channel->flag & HOSTAPD_CHAN_RADAR) | |
411 | res++; | |
412 | } | |
413 | ||
414 | return res; | |
415 | } | |
416 | ||
417 | ||
418 | /* All channels available */ | |
dc036d9e | 419 | static int dfs_check_chans_available(struct hostapd_iface *iface, |
58b73e3d JD |
420 | int start_chan_idx, int n_chans) |
421 | { | |
422 | struct hostapd_channel_data *channel; | |
423 | struct hostapd_hw_modes *mode; | |
424 | int i; | |
425 | ||
dc036d9e | 426 | mode = iface->current_mode; |
58b73e3d | 427 | |
8c9cb81f | 428 | for (i = 0; i < n_chans; i++) { |
58b73e3d | 429 | channel = &mode->channels[start_chan_idx + i]; |
b8058a69 JD |
430 | |
431 | if (channel->flag & HOSTAPD_CHAN_DISABLED) | |
432 | break; | |
433 | ||
434 | if (!(channel->flag & HOSTAPD_CHAN_RADAR)) | |
435 | continue; | |
436 | ||
58b73e3d JD |
437 | if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) != |
438 | HOSTAPD_CHAN_DFS_AVAILABLE) | |
439 | break; | |
440 | } | |
441 | ||
442 | return i == n_chans; | |
443 | } | |
444 | ||
445 | ||
446 | /* At least one channel unavailable */ | |
dc036d9e | 447 | static int dfs_check_chans_unavailable(struct hostapd_iface *iface, |
58b73e3d JD |
448 | int start_chan_idx, |
449 | int n_chans) | |
450 | { | |
451 | struct hostapd_channel_data *channel; | |
452 | struct hostapd_hw_modes *mode; | |
453 | int i, res = 0; | |
454 | ||
dc036d9e | 455 | mode = iface->current_mode; |
58b73e3d | 456 | |
8c9cb81f | 457 | for (i = 0; i < n_chans; i++) { |
58b73e3d JD |
458 | channel = &mode->channels[start_chan_idx + i]; |
459 | if (channel->flag & HOSTAPD_CHAN_DISABLED) | |
460 | res++; | |
461 | if ((channel->flag & HOSTAPD_CHAN_DFS_MASK) == | |
462 | HOSTAPD_CHAN_DFS_UNAVAILABLE) | |
463 | res++; | |
464 | } | |
465 | ||
466 | return res; | |
467 | } | |
468 | ||
469 | ||
32595da6 | 470 | static struct hostapd_channel_data * |
dc036d9e | 471 | dfs_get_valid_channel(struct hostapd_iface *iface, |
32595da6 | 472 | int *secondary_channel, |
7118a697 JC |
473 | u8 *oper_centr_freq_seg0_idx, |
474 | u8 *oper_centr_freq_seg1_idx, | |
b72f949b | 475 | int skip_radar) |
e76da505 JD |
476 | { |
477 | struct hostapd_hw_modes *mode; | |
478 | struct hostapd_channel_data *chan = NULL; | |
f64b601c | 479 | struct hostapd_channel_data *chan2 = NULL; |
32595da6 | 480 | int num_available_chandefs; |
f64b601c PKP |
481 | int chan_idx, chan_idx2; |
482 | int sec_chan_idx_80p80 = -1; | |
483 | int i; | |
e76da505 JD |
484 | u32 _rand; |
485 | ||
486 | wpa_printf(MSG_DEBUG, "DFS: Selecting random channel"); | |
3d91a047 | 487 | *secondary_channel = 0; |
7118a697 JC |
488 | *oper_centr_freq_seg0_idx = 0; |
489 | *oper_centr_freq_seg1_idx = 0; | |
e76da505 | 490 | |
dc036d9e | 491 | if (iface->current_mode == NULL) |
e76da505 JD |
492 | return NULL; |
493 | ||
dc036d9e | 494 | mode = iface->current_mode; |
e76da505 JD |
495 | if (mode->mode != HOSTAPD_MODE_IEEE80211A) |
496 | return NULL; | |
497 | ||
32595da6 | 498 | /* Get the count first */ |
b72f949b | 499 | num_available_chandefs = dfs_find_channel(iface, NULL, 0, skip_radar); |
8f89e57a JM |
500 | wpa_printf(MSG_DEBUG, "DFS: num_available_chandefs=%d", |
501 | num_available_chandefs); | |
32595da6 MK |
502 | if (num_available_chandefs == 0) |
503 | return NULL; | |
e76da505 | 504 | |
7c0e5b58 | 505 | if (os_get_random((u8 *) &_rand, sizeof(_rand)) < 0) |
239952b4 | 506 | return NULL; |
32595da6 | 507 | chan_idx = _rand % num_available_chandefs; |
b72f949b | 508 | dfs_find_channel(iface, &chan, chan_idx, skip_radar); |
f64b601c | 509 | if (!chan) { |
8f89e57a | 510 | wpa_printf(MSG_DEBUG, "DFS: no random channel found"); |
f64b601c PKP |
511 | return NULL; |
512 | } | |
513 | wpa_printf(MSG_DEBUG, "DFS: got random channel %d (%d)", | |
514 | chan->freq, chan->chan); | |
32595da6 MK |
515 | |
516 | /* dfs_find_channel() calculations assume HT40+ */ | |
dc036d9e | 517 | if (iface->conf->secondary_channel) |
32595da6 MK |
518 | *secondary_channel = 1; |
519 | else | |
520 | *secondary_channel = 0; | |
521 | ||
f64b601c PKP |
522 | /* Get secondary channel for HT80P80 */ |
523 | if (hostapd_get_oper_chwidth(iface->conf) == CHANWIDTH_80P80MHZ) { | |
524 | if (num_available_chandefs <= 1) { | |
525 | wpa_printf(MSG_ERROR, | |
526 | "only 1 valid chan, can't support 80+80"); | |
527 | return NULL; | |
528 | } | |
529 | ||
530 | /* | |
531 | * Loop all channels except channel1 to find a valid channel2 | |
532 | * that is not adjacent to channel1. | |
533 | */ | |
534 | for (i = 0; i < num_available_chandefs - 1; i++) { | |
535 | /* start from chan_idx + 1, end when chan_idx - 1 */ | |
536 | chan_idx2 = (chan_idx + 1 + i) % num_available_chandefs; | |
537 | dfs_find_channel(iface, &chan2, chan_idx2, skip_radar); | |
538 | if (chan2 && abs(chan2->chan - chan->chan) > 12) { | |
539 | /* two channels are not adjacent */ | |
540 | sec_chan_idx_80p80 = chan2->chan; | |
541 | wpa_printf(MSG_DEBUG, | |
542 | "DFS: got second chan: %d (%d)", | |
543 | chan2->freq, chan2->chan); | |
544 | break; | |
545 | } | |
546 | } | |
547 | ||
548 | /* Check if we got a valid secondary channel which is not | |
549 | * adjacent to the first channel. | |
550 | */ | |
551 | if (sec_chan_idx_80p80 == -1) { | |
552 | wpa_printf(MSG_INFO, | |
553 | "DFS: failed to get chan2 for 80+80"); | |
554 | return NULL; | |
555 | } | |
556 | } | |
557 | ||
7118a697 JC |
558 | dfs_adjust_center_freq(iface, chan, |
559 | *secondary_channel, | |
f64b601c | 560 | sec_chan_idx_80p80, |
7118a697 JC |
561 | oper_centr_freq_seg0_idx, |
562 | oper_centr_freq_seg1_idx); | |
58b73e3d | 563 | |
e76da505 JD |
564 | return chan; |
565 | } | |
566 | ||
567 | ||
dc036d9e | 568 | static int set_dfs_state_freq(struct hostapd_iface *iface, int freq, u32 state) |
e76da505 JD |
569 | { |
570 | struct hostapd_hw_modes *mode; | |
571 | struct hostapd_channel_data *chan = NULL; | |
572 | int i; | |
573 | ||
dc036d9e | 574 | mode = iface->current_mode; |
e76da505 JD |
575 | if (mode == NULL) |
576 | return 0; | |
577 | ||
58b73e3d | 578 | wpa_printf(MSG_DEBUG, "set_dfs_state 0x%X for %d MHz", state, freq); |
dc036d9e JM |
579 | for (i = 0; i < iface->current_mode->num_channels; i++) { |
580 | chan = &iface->current_mode->channels[i]; | |
e76da505 JD |
581 | if (chan->freq == freq) { |
582 | if (chan->flag & HOSTAPD_CHAN_RADAR) { | |
583 | chan->flag &= ~HOSTAPD_CHAN_DFS_MASK; | |
584 | chan->flag |= state; | |
585 | return 1; /* Channel found */ | |
586 | } | |
587 | } | |
588 | } | |
589 | wpa_printf(MSG_WARNING, "Can't set DFS state for freq %d MHz", freq); | |
590 | return 0; | |
591 | } | |
592 | ||
593 | ||
dc036d9e | 594 | static int set_dfs_state(struct hostapd_iface *iface, int freq, int ht_enabled, |
58b73e3d JD |
595 | int chan_offset, int chan_width, int cf1, |
596 | int cf2, u32 state) | |
597 | { | |
598 | int n_chans = 1, i; | |
599 | struct hostapd_hw_modes *mode; | |
600 | int frequency = freq; | |
530b8ee3 | 601 | int frequency2 = 0; |
58b73e3d JD |
602 | int ret = 0; |
603 | ||
dc036d9e | 604 | mode = iface->current_mode; |
58b73e3d JD |
605 | if (mode == NULL) |
606 | return 0; | |
607 | ||
608 | if (mode->mode != HOSTAPD_MODE_IEEE80211A) { | |
609 | wpa_printf(MSG_WARNING, "current_mode != IEEE80211A"); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | /* Seems cf1 and chan_width is enough here */ | |
614 | switch (chan_width) { | |
615 | case CHAN_WIDTH_20_NOHT: | |
616 | case CHAN_WIDTH_20: | |
617 | n_chans = 1; | |
bb337dda JM |
618 | if (frequency == 0) |
619 | frequency = cf1; | |
58b73e3d JD |
620 | break; |
621 | case CHAN_WIDTH_40: | |
622 | n_chans = 2; | |
623 | frequency = cf1 - 10; | |
624 | break; | |
625 | case CHAN_WIDTH_80: | |
626 | n_chans = 4; | |
627 | frequency = cf1 - 30; | |
628 | break; | |
530b8ee3 LW |
629 | case CHAN_WIDTH_80P80: |
630 | n_chans = 4; | |
631 | frequency = cf1 - 30; | |
632 | frequency2 = cf2 - 30; | |
633 | break; | |
899cc14e JD |
634 | case CHAN_WIDTH_160: |
635 | n_chans = 8; | |
636 | frequency = cf1 - 70; | |
637 | break; | |
58b73e3d JD |
638 | default: |
639 | wpa_printf(MSG_INFO, "DFS chan_width %d not supported", | |
640 | chan_width); | |
641 | break; | |
642 | } | |
643 | ||
644 | wpa_printf(MSG_DEBUG, "DFS freq: %dMHz, n_chans: %d", frequency, | |
645 | n_chans); | |
646 | for (i = 0; i < n_chans; i++) { | |
dc036d9e | 647 | ret += set_dfs_state_freq(iface, frequency, state); |
58b73e3d | 648 | frequency = frequency + 20; |
530b8ee3 LW |
649 | |
650 | if (chan_width == CHAN_WIDTH_80P80) { | |
651 | ret += set_dfs_state_freq(iface, frequency2, state); | |
652 | frequency2 = frequency2 + 20; | |
653 | } | |
58b73e3d JD |
654 | } |
655 | ||
656 | return ret; | |
657 | } | |
658 | ||
659 | ||
dc036d9e | 660 | static int dfs_are_channels_overlapped(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
661 | int chan_width, int cf1, int cf2) |
662 | { | |
4a274f48 | 663 | int start_chan_idx, start_chan_idx1; |
58b73e3d JD |
664 | struct hostapd_hw_modes *mode; |
665 | struct hostapd_channel_data *chan; | |
4a274f48 | 666 | int n_chans, n_chans1, i, j, frequency = freq, radar_n_chans = 1; |
58b73e3d JD |
667 | u8 radar_chan; |
668 | int res = 0; | |
669 | ||
58b73e3d | 670 | /* Our configuration */ |
dc036d9e | 671 | mode = iface->current_mode; |
4a274f48 JM |
672 | start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1); |
673 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); | |
58b73e3d | 674 | |
5eaf240a | 675 | /* Check we are on DFS channel(s) */ |
dc036d9e | 676 | if (!dfs_check_chans_radar(iface, start_chan_idx, n_chans)) |
5eaf240a JD |
677 | return 0; |
678 | ||
58b73e3d JD |
679 | /* Reported via radar event */ |
680 | switch (chan_width) { | |
681 | case CHAN_WIDTH_20_NOHT: | |
682 | case CHAN_WIDTH_20: | |
683 | radar_n_chans = 1; | |
bb337dda JM |
684 | if (frequency == 0) |
685 | frequency = cf1; | |
58b73e3d JD |
686 | break; |
687 | case CHAN_WIDTH_40: | |
688 | radar_n_chans = 2; | |
689 | frequency = cf1 - 10; | |
690 | break; | |
691 | case CHAN_WIDTH_80: | |
692 | radar_n_chans = 4; | |
693 | frequency = cf1 - 30; | |
694 | break; | |
899cc14e JD |
695 | case CHAN_WIDTH_160: |
696 | radar_n_chans = 8; | |
697 | frequency = cf1 - 70; | |
698 | break; | |
58b73e3d JD |
699 | default: |
700 | wpa_printf(MSG_INFO, "DFS chan_width %d not supported", | |
701 | chan_width); | |
702 | break; | |
703 | } | |
704 | ||
705 | ieee80211_freq_to_chan(frequency, &radar_chan); | |
706 | ||
707 | for (i = 0; i < n_chans; i++) { | |
708 | chan = &mode->channels[start_chan_idx + i]; | |
5eaf240a JD |
709 | if (!(chan->flag & HOSTAPD_CHAN_RADAR)) |
710 | continue; | |
58b73e3d JD |
711 | for (j = 0; j < radar_n_chans; j++) { |
712 | wpa_printf(MSG_DEBUG, "checking our: %d, radar: %d", | |
713 | chan->chan, radar_chan + j * 4); | |
714 | if (chan->chan == radar_chan + j * 4) | |
715 | res++; | |
716 | } | |
717 | } | |
718 | ||
719 | wpa_printf(MSG_DEBUG, "overlapped: %d", res); | |
720 | ||
721 | return res; | |
722 | } | |
723 | ||
724 | ||
bbbacbf2 JD |
725 | static unsigned int dfs_get_cac_time(struct hostapd_iface *iface, |
726 | int start_chan_idx, int n_chans) | |
727 | { | |
728 | struct hostapd_channel_data *channel; | |
729 | struct hostapd_hw_modes *mode; | |
730 | int i; | |
731 | unsigned int cac_time_ms = 0; | |
732 | ||
733 | mode = iface->current_mode; | |
734 | ||
735 | for (i = 0; i < n_chans; i++) { | |
736 | channel = &mode->channels[start_chan_idx + i]; | |
737 | if (!(channel->flag & HOSTAPD_CHAN_RADAR)) | |
738 | continue; | |
739 | if (channel->dfs_cac_ms > cac_time_ms) | |
740 | cac_time_ms = channel->dfs_cac_ms; | |
741 | } | |
742 | ||
743 | return cac_time_ms; | |
744 | } | |
745 | ||
746 | ||
e76da505 JD |
747 | /* |
748 | * Main DFS handler | |
749 | * 1 - continue channel/ap setup | |
750 | * 0 - channel/ap setup will be continued after CAC | |
751 | * -1 - hit critical error | |
752 | */ | |
dc036d9e | 753 | int hostapd_handle_dfs(struct hostapd_iface *iface) |
e76da505 | 754 | { |
e76da505 | 755 | struct hostapd_channel_data *channel; |
4a274f48 | 756 | int res, n_chans, n_chans1, start_chan_idx, start_chan_idx1; |
b72f949b | 757 | int skip_radar = 0; |
58b73e3d | 758 | |
3cf360b8 AB |
759 | if (is_6ghz_freq(iface->freq)) |
760 | return 1; | |
761 | ||
afbe57d9 JM |
762 | if (!iface->current_mode) { |
763 | /* | |
764 | * This can happen with drivers that do not provide mode | |
765 | * information and as such, cannot really use hostapd for DFS. | |
766 | */ | |
767 | wpa_printf(MSG_DEBUG, | |
768 | "DFS: No current_mode information - assume no need to perform DFS operations by hostapd"); | |
769 | return 1; | |
770 | } | |
771 | ||
dc036d9e | 772 | iface->cac_started = 0; |
954e71d2 | 773 | |
58b73e3d JD |
774 | do { |
775 | /* Get start (first) channel for current configuration */ | |
4a274f48 JM |
776 | start_chan_idx = dfs_get_start_chan_idx(iface, |
777 | &start_chan_idx1); | |
58b73e3d JD |
778 | if (start_chan_idx == -1) |
779 | return -1; | |
780 | ||
781 | /* Get number of used channels, depend on width */ | |
4a274f48 | 782 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); |
58b73e3d | 783 | |
bbbacbf2 JD |
784 | /* Setup CAC time */ |
785 | iface->dfs_cac_ms = dfs_get_cac_time(iface, start_chan_idx, | |
786 | n_chans); | |
787 | ||
58b73e3d | 788 | /* Check if any of configured channels require DFS */ |
dc036d9e | 789 | res = dfs_check_chans_radar(iface, start_chan_idx, n_chans); |
58b73e3d JD |
790 | wpa_printf(MSG_DEBUG, |
791 | "DFS %d channels required radar detection", | |
792 | res); | |
793 | if (!res) | |
794 | return 1; | |
795 | ||
796 | /* Check if all channels are DFS available */ | |
dc036d9e | 797 | res = dfs_check_chans_available(iface, start_chan_idx, n_chans); |
58b73e3d JD |
798 | wpa_printf(MSG_DEBUG, |
799 | "DFS all channels available, (SKIP CAC): %s", | |
800 | res ? "yes" : "no"); | |
801 | if (res) | |
802 | return 1; | |
803 | ||
804 | /* Check if any of configured channels is unavailable */ | |
dc036d9e | 805 | res = dfs_check_chans_unavailable(iface, start_chan_idx, |
58b73e3d JD |
806 | n_chans); |
807 | wpa_printf(MSG_DEBUG, "DFS %d chans unavailable - choose other channel: %s", | |
808 | res, res ? "yes": "no"); | |
809 | if (res) { | |
5479ff90 MS |
810 | int sec = 0; |
811 | u8 cf1 = 0, cf2 = 0; | |
32595da6 | 812 | |
b72f949b MK |
813 | channel = dfs_get_valid_channel(iface, &sec, &cf1, &cf2, |
814 | skip_radar); | |
e76da505 JD |
815 | if (!channel) { |
816 | wpa_printf(MSG_ERROR, "could not get valid channel"); | |
3bd58861 ZK |
817 | hostapd_set_state(iface, HAPD_IFACE_DFS); |
818 | return 0; | |
e76da505 | 819 | } |
32595da6 | 820 | |
dc036d9e JM |
821 | iface->freq = channel->freq; |
822 | iface->conf->channel = channel->chan; | |
823 | iface->conf->secondary_channel = sec; | |
c6b7ac07 JC |
824 | hostapd_set_oper_centr_freq_seg0_idx(iface->conf, cf1); |
825 | hostapd_set_oper_centr_freq_seg1_idx(iface->conf, cf2); | |
e76da505 | 826 | } |
58b73e3d JD |
827 | } while (res); |
828 | ||
829 | /* Finally start CAC */ | |
dc036d9e JM |
830 | hostapd_set_state(iface, HAPD_IFACE_DFS); |
831 | wpa_printf(MSG_DEBUG, "DFS start CAC on %d MHz", iface->freq); | |
832 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START | |
bbbacbf2 | 833 | "freq=%d chan=%d sec_chan=%d, width=%d, seg0=%d, seg1=%d, cac_time=%ds", |
dc036d9e | 834 | iface->freq, |
1f374834 | 835 | iface->conf->channel, iface->conf->secondary_channel, |
c6b7ac07 JC |
836 | hostapd_get_oper_chwidth(iface->conf), |
837 | hostapd_get_oper_centr_freq_seg0_idx(iface->conf), | |
838 | hostapd_get_oper_centr_freq_seg1_idx(iface->conf), | |
bbbacbf2 | 839 | iface->dfs_cac_ms / 1000); |
1f374834 | 840 | |
c6b7ac07 JC |
841 | res = hostapd_start_dfs_cac( |
842 | iface, iface->conf->hw_mode, iface->freq, iface->conf->channel, | |
843 | iface->conf->ieee80211n, iface->conf->ieee80211ac, | |
88005ee9 | 844 | iface->conf->ieee80211ax, |
c6b7ac07 JC |
845 | iface->conf->secondary_channel, |
846 | hostapd_get_oper_chwidth(iface->conf), | |
847 | hostapd_get_oper_centr_freq_seg0_idx(iface->conf), | |
848 | hostapd_get_oper_centr_freq_seg1_idx(iface->conf)); | |
1f374834 JD |
849 | |
850 | if (res) { | |
851 | wpa_printf(MSG_ERROR, "DFS start_dfs_cac() failed, %d", res); | |
58b73e3d | 852 | return -1; |
e76da505 JD |
853 | } |
854 | ||
58b73e3d | 855 | return 0; |
e76da505 JD |
856 | } |
857 | ||
858 | ||
79887673 | 859 | int hostapd_is_dfs_chan_available(struct hostapd_iface *iface) |
3dcd735c VT |
860 | { |
861 | int n_chans, n_chans1, start_chan_idx, start_chan_idx1; | |
862 | ||
863 | /* Get the start (first) channel for current configuration */ | |
864 | start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1); | |
865 | if (start_chan_idx < 0) | |
866 | return 0; | |
867 | ||
868 | /* Get the number of used channels, depending on width */ | |
869 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); | |
870 | ||
871 | /* Check if all channels are DFS available */ | |
872 | return dfs_check_chans_available(iface, start_chan_idx, n_chans); | |
873 | } | |
874 | ||
875 | ||
dc036d9e | 876 | int hostapd_dfs_complete_cac(struct hostapd_iface *iface, int success, int freq, |
58b73e3d JD |
877 | int ht_enabled, int chan_offset, int chan_width, |
878 | int cf1, int cf2) | |
e76da505 | 879 | { |
dc036d9e | 880 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_COMPLETED |
186c9059 JM |
881 | "success=%d freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
882 | success, freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
883 | ||
e76da505 JD |
884 | if (success) { |
885 | /* Complete iface/ap configuration */ | |
5de81d7a AK |
886 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) { |
887 | /* Complete AP configuration for the first bring up. */ | |
888 | if (iface->state != HAPD_IFACE_ENABLED) | |
889 | hostapd_setup_interface_complete(iface, 0); | |
890 | else | |
891 | iface->cac_started = 0; | |
892 | } else { | |
893 | set_dfs_state(iface, freq, ht_enabled, chan_offset, | |
894 | chan_width, cf1, cf2, | |
895 | HOSTAPD_CHAN_DFS_AVAILABLE); | |
3dcd735c VT |
896 | /* |
897 | * Just mark the channel available when CAC completion | |
898 | * event is received in enabled state. CAC result could | |
899 | * have been propagated from another radio having the | |
900 | * same regulatory configuration. When CAC completion is | |
901 | * received during non-HAPD_IFACE_ENABLED state, make | |
902 | * sure the configured channel is available because this | |
903 | * CAC completion event could have been propagated from | |
904 | * another radio. | |
905 | */ | |
906 | if (iface->state != HAPD_IFACE_ENABLED && | |
79887673 | 907 | hostapd_is_dfs_chan_available(iface)) { |
3dcd735c VT |
908 | hostapd_setup_interface_complete(iface, 0); |
909 | iface->cac_started = 0; | |
910 | } | |
5de81d7a | 911 | } |
e76da505 JD |
912 | } |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | ||
7cbb5f1a VT |
918 | int hostapd_dfs_pre_cac_expired(struct hostapd_iface *iface, int freq, |
919 | int ht_enabled, int chan_offset, int chan_width, | |
920 | int cf1, int cf2) | |
921 | { | |
922 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_PRE_CAC_EXPIRED | |
923 | "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", | |
924 | freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
925 | ||
926 | /* Proceed only if DFS is not offloaded to the driver */ | |
927 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) | |
928 | return 0; | |
929 | ||
930 | set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width, | |
931 | cf1, cf2, HOSTAPD_CHAN_DFS_USABLE); | |
932 | ||
933 | return 0; | |
934 | } | |
935 | ||
936 | ||
4b37d242 SM |
937 | static struct hostapd_channel_data * |
938 | dfs_downgrade_bandwidth(struct hostapd_iface *iface, int *secondary_channel, | |
939 | u8 *oper_centr_freq_seg0_idx, | |
940 | u8 *oper_centr_freq_seg1_idx, int *skip_radar) | |
941 | { | |
942 | struct hostapd_channel_data *channel; | |
943 | ||
944 | for (;;) { | |
945 | channel = dfs_get_valid_channel(iface, secondary_channel, | |
946 | oper_centr_freq_seg0_idx, | |
947 | oper_centr_freq_seg1_idx, | |
948 | *skip_radar); | |
949 | if (channel) { | |
950 | wpa_printf(MSG_DEBUG, "DFS: Selected channel: %d", | |
951 | channel->chan); | |
952 | return channel; | |
953 | } | |
954 | ||
955 | if (*skip_radar) { | |
956 | *skip_radar = 0; | |
957 | } else { | |
958 | if (iface->conf->vht_oper_chwidth == CHANWIDTH_USE_HT) | |
959 | break; | |
960 | *skip_radar = 1; | |
961 | iface->conf->vht_oper_chwidth--; | |
962 | } | |
963 | } | |
964 | ||
965 | wpa_printf(MSG_INFO, | |
966 | "%s: no DFS channels left, waiting for NOP to finish", | |
967 | __func__); | |
968 | return NULL; | |
969 | } | |
970 | ||
971 | ||
f7154cee | 972 | static int hostapd_dfs_start_channel_switch_cac(struct hostapd_iface *iface) |
e76da505 JD |
973 | { |
974 | struct hostapd_channel_data *channel; | |
f7154cee | 975 | int secondary_channel; |
7118a697 JC |
976 | u8 oper_centr_freq_seg0_idx = 0; |
977 | u8 oper_centr_freq_seg1_idx = 0; | |
f7154cee | 978 | int skip_radar = 0; |
e76da505 | 979 | int err = 1; |
f7154cee JD |
980 | |
981 | /* Radar detected during active CAC */ | |
982 | iface->cac_started = 0; | |
983 | channel = dfs_get_valid_channel(iface, &secondary_channel, | |
7118a697 JC |
984 | &oper_centr_freq_seg0_idx, |
985 | &oper_centr_freq_seg1_idx, | |
f7154cee JD |
986 | skip_radar); |
987 | ||
988 | if (!channel) { | |
4b37d242 SM |
989 | channel = dfs_downgrade_bandwidth(iface, &secondary_channel, |
990 | &oper_centr_freq_seg0_idx, | |
991 | &oper_centr_freq_seg1_idx, | |
992 | &skip_radar); | |
993 | if (!channel) { | |
994 | wpa_printf(MSG_ERROR, "No valid channel available"); | |
995 | return err; | |
996 | } | |
f7154cee JD |
997 | } |
998 | ||
999 | wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d", | |
1000 | channel->chan); | |
1001 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL | |
1002 | "freq=%d chan=%d sec_chan=%d", channel->freq, | |
1003 | channel->chan, secondary_channel); | |
1004 | ||
1005 | iface->freq = channel->freq; | |
1006 | iface->conf->channel = channel->chan; | |
1007 | iface->conf->secondary_channel = secondary_channel; | |
c6b7ac07 JC |
1008 | hostapd_set_oper_centr_freq_seg0_idx(iface->conf, |
1009 | oper_centr_freq_seg0_idx); | |
1010 | hostapd_set_oper_centr_freq_seg1_idx(iface->conf, | |
1011 | oper_centr_freq_seg1_idx); | |
f7154cee JD |
1012 | err = 0; |
1013 | ||
1014 | hostapd_setup_interface_complete(iface, err); | |
1015 | return err; | |
1016 | } | |
1017 | ||
1018 | ||
1019 | static int hostapd_dfs_start_channel_switch(struct hostapd_iface *iface) | |
1020 | { | |
1021 | struct hostapd_channel_data *channel; | |
32595da6 | 1022 | int secondary_channel; |
7118a697 JC |
1023 | u8 oper_centr_freq_seg0_idx; |
1024 | u8 oper_centr_freq_seg1_idx; | |
4b37d242 | 1025 | u8 new_vht_oper_chwidth; |
b72f949b | 1026 | int skip_radar = 1; |
f7154cee | 1027 | struct csa_settings csa_settings; |
8974620e | 1028 | unsigned int i; |
f7154cee | 1029 | int err = 1; |
29d8bd1d | 1030 | struct hostapd_hw_modes *cmode = iface->current_mode; |
4b37d242 | 1031 | u8 current_vht_oper_chwidth = iface->conf->vht_oper_chwidth; |
f7154cee | 1032 | |
25592b23 JD |
1033 | wpa_printf(MSG_DEBUG, "%s called (CAC active: %s, CSA active: %s)", |
1034 | __func__, iface->cac_started ? "yes" : "no", | |
6782b684 | 1035 | hostapd_csa_in_progress(iface) ? "yes" : "no"); |
25592b23 JD |
1036 | |
1037 | /* Check if CSA in progress */ | |
6782b684 | 1038 | if (hostapd_csa_in_progress(iface)) |
25592b23 | 1039 | return 0; |
f7154cee JD |
1040 | |
1041 | /* Check if active CAC */ | |
1042 | if (iface->cac_started) | |
1043 | return hostapd_dfs_start_channel_switch_cac(iface); | |
e76da505 | 1044 | |
04f667fc VT |
1045 | /* |
1046 | * Allow selection of DFS channel in ETSI to comply with | |
1047 | * uniform spreading. | |
1048 | */ | |
1049 | if (iface->dfs_domain == HOSTAPD_DFS_REGION_ETSI) | |
1050 | skip_radar = 0; | |
1051 | ||
f7154cee | 1052 | /* Perform channel switch/CSA */ |
dc036d9e | 1053 | channel = dfs_get_valid_channel(iface, &secondary_channel, |
7118a697 JC |
1054 | &oper_centr_freq_seg0_idx, |
1055 | &oper_centr_freq_seg1_idx, | |
b72f949b | 1056 | skip_radar); |
813d4bac | 1057 | |
f7154cee | 1058 | if (!channel) { |
e0700512 SW |
1059 | /* |
1060 | * If there is no channel to switch immediately to, check if | |
1061 | * there is another channel where we can switch even if it | |
1062 | * requires to perform a CAC first. | |
1063 | */ | |
1064 | skip_radar = 0; | |
4b37d242 SM |
1065 | channel = dfs_downgrade_bandwidth(iface, &secondary_channel, |
1066 | &oper_centr_freq_seg0_idx, | |
1067 | &oper_centr_freq_seg1_idx, | |
1068 | &skip_radar); | |
1069 | if (!channel) | |
e0700512 | 1070 | return err; |
4b37d242 SM |
1071 | if (!skip_radar) { |
1072 | iface->freq = channel->freq; | |
1073 | iface->conf->channel = channel->chan; | |
1074 | iface->conf->secondary_channel = secondary_channel; | |
1075 | hostapd_set_oper_centr_freq_seg0_idx( | |
1076 | iface->conf, oper_centr_freq_seg0_idx); | |
1077 | hostapd_set_oper_centr_freq_seg1_idx( | |
1078 | iface->conf, oper_centr_freq_seg1_idx); | |
1079 | ||
1080 | hostapd_disable_iface(iface); | |
1081 | hostapd_enable_iface(iface); | |
1082 | return 0; | |
e0700512 | 1083 | } |
f7154cee JD |
1084 | } |
1085 | ||
1086 | wpa_printf(MSG_DEBUG, "DFS will switch to a new channel %d", | |
1087 | channel->chan); | |
1088 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NEW_CHANNEL | |
1089 | "freq=%d chan=%d sec_chan=%d", channel->freq, | |
1090 | channel->chan, secondary_channel); | |
1091 | ||
4b37d242 SM |
1092 | new_vht_oper_chwidth = iface->conf->vht_oper_chwidth; |
1093 | iface->conf->vht_oper_chwidth = current_vht_oper_chwidth; | |
1094 | ||
f7154cee JD |
1095 | /* Setup CSA request */ |
1096 | os_memset(&csa_settings, 0, sizeof(csa_settings)); | |
1097 | csa_settings.cs_count = 5; | |
1098 | csa_settings.block_tx = 1; | |
1099 | err = hostapd_set_freq_params(&csa_settings.freq_params, | |
1100 | iface->conf->hw_mode, | |
1101 | channel->freq, | |
1102 | channel->chan, | |
bebd91e9 AAL |
1103 | iface->conf->enable_edmg, |
1104 | iface->conf->edmg_channel, | |
f7154cee JD |
1105 | iface->conf->ieee80211n, |
1106 | iface->conf->ieee80211ac, | |
88005ee9 | 1107 | iface->conf->ieee80211ax, |
f7154cee | 1108 | secondary_channel, |
4b37d242 | 1109 | new_vht_oper_chwidth, |
7118a697 JC |
1110 | oper_centr_freq_seg0_idx, |
1111 | oper_centr_freq_seg1_idx, | |
29d8bd1d SE |
1112 | cmode->vht_capab, |
1113 | &cmode->he_capab[IEEE80211_MODE_AP]); | |
f7154cee JD |
1114 | |
1115 | if (err) { | |
1116 | wpa_printf(MSG_ERROR, "DFS failed to calculate CSA freq params"); | |
1117 | hostapd_disable_iface(iface); | |
1118 | return err; | |
1119 | } | |
1120 | ||
8974620e MK |
1121 | for (i = 0; i < iface->num_bss; i++) { |
1122 | err = hostapd_switch_channel(iface->bss[i], &csa_settings); | |
1123 | if (err) | |
1124 | break; | |
1125 | } | |
1126 | ||
f7154cee JD |
1127 | if (err) { |
1128 | wpa_printf(MSG_WARNING, "DFS failed to schedule CSA (%d) - trying fallback", | |
1129 | err); | |
dc036d9e JM |
1130 | iface->freq = channel->freq; |
1131 | iface->conf->channel = channel->chan; | |
1132 | iface->conf->secondary_channel = secondary_channel; | |
4b37d242 | 1133 | iface->conf->vht_oper_chwidth = new_vht_oper_chwidth; |
c6b7ac07 JC |
1134 | hostapd_set_oper_centr_freq_seg0_idx(iface->conf, |
1135 | oper_centr_freq_seg0_idx); | |
1136 | hostapd_set_oper_centr_freq_seg1_idx(iface->conf, | |
1137 | oper_centr_freq_seg1_idx); | |
813d4bac | 1138 | |
dc036d9e | 1139 | hostapd_disable_iface(iface); |
f7154cee JD |
1140 | hostapd_enable_iface(iface); |
1141 | return 0; | |
2e946249 | 1142 | } |
e76da505 | 1143 | |
f7154cee JD |
1144 | /* Channel configuration will be updated once CSA completes and |
1145 | * ch_switch_notify event is received */ | |
1146 | ||
1147 | wpa_printf(MSG_DEBUG, "DFS waiting channel switch event"); | |
e76da505 JD |
1148 | return 0; |
1149 | } | |
58b73e3d JD |
1150 | |
1151 | ||
dc036d9e | 1152 | int hostapd_dfs_radar_detected(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
1153 | int ht_enabled, int chan_offset, int chan_width, |
1154 | int cf1, int cf2) | |
1155 | { | |
1156 | int res; | |
1157 | ||
dc036d9e | 1158 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_RADAR_DETECTED |
186c9059 JM |
1159 | "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
1160 | freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
1161 | ||
5de81d7a AK |
1162 | /* Proceed only if DFS is not offloaded to the driver */ |
1163 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) | |
1164 | return 0; | |
1165 | ||
1166 | if (!iface->conf->ieee80211h) | |
1167 | return 0; | |
1168 | ||
58b73e3d | 1169 | /* mark radar frequency as invalid */ |
7242087d SM |
1170 | res = set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width, |
1171 | cf1, cf2, HOSTAPD_CHAN_DFS_UNAVAILABLE); | |
1172 | if (!res) | |
1173 | return 0; | |
58b73e3d JD |
1174 | |
1175 | /* Skip if reported radar event not overlapped our channels */ | |
dc036d9e | 1176 | res = dfs_are_channels_overlapped(iface, freq, chan_width, cf1, cf2); |
58b73e3d JD |
1177 | if (!res) |
1178 | return 0; | |
1179 | ||
58b73e3d | 1180 | /* radar detected while operating, switch the channel. */ |
dc036d9e | 1181 | res = hostapd_dfs_start_channel_switch(iface); |
58b73e3d JD |
1182 | |
1183 | return res; | |
1184 | } | |
1185 | ||
1186 | ||
dc036d9e | 1187 | int hostapd_dfs_nop_finished(struct hostapd_iface *iface, int freq, |
58b73e3d JD |
1188 | int ht_enabled, int chan_offset, int chan_width, |
1189 | int cf1, int cf2) | |
1190 | { | |
dc036d9e | 1191 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_NOP_FINISHED |
186c9059 JM |
1192 | "freq=%d ht_enabled=%d chan_offset=%d chan_width=%d cf1=%d cf2=%d", |
1193 | freq, ht_enabled, chan_offset, chan_width, cf1, cf2); | |
5de81d7a AK |
1194 | |
1195 | /* Proceed only if DFS is not offloaded to the driver */ | |
1196 | if (iface->drv_flags & WPA_DRIVER_FLAGS_DFS_OFFLOAD) | |
1197 | return 0; | |
1198 | ||
58b73e3d | 1199 | /* TODO add correct implementation here */ |
dc036d9e JM |
1200 | set_dfs_state(iface, freq, ht_enabled, chan_offset, chan_width, |
1201 | cf1, cf2, HOSTAPD_CHAN_DFS_USABLE); | |
3bd58861 ZK |
1202 | |
1203 | /* Handle cases where all channels were initially unavailable */ | |
1204 | if (iface->state == HAPD_IFACE_DFS && !iface->cac_started) | |
1205 | hostapd_handle_dfs(iface); | |
1206 | ||
58b73e3d JD |
1207 | return 0; |
1208 | } | |
3d7ad2f6 C |
1209 | |
1210 | ||
1211 | int hostapd_is_dfs_required(struct hostapd_iface *iface) | |
1212 | { | |
4a274f48 | 1213 | int n_chans, n_chans1, start_chan_idx, start_chan_idx1, res; |
3d7ad2f6 | 1214 | |
8a0f3bf6 MP |
1215 | if (!iface->conf->ieee80211h || !iface->current_mode || |
1216 | iface->current_mode->mode != HOSTAPD_MODE_IEEE80211A) | |
1217 | return 0; | |
3d7ad2f6 C |
1218 | |
1219 | /* Get start (first) channel for current configuration */ | |
4a274f48 | 1220 | start_chan_idx = dfs_get_start_chan_idx(iface, &start_chan_idx1); |
3d7ad2f6 C |
1221 | if (start_chan_idx == -1) |
1222 | return -1; | |
1223 | ||
1224 | /* Get number of used channels, depend on width */ | |
4a274f48 | 1225 | n_chans = dfs_get_used_n_chans(iface, &n_chans1); |
3d7ad2f6 C |
1226 | |
1227 | /* Check if any of configured channels require DFS */ | |
4a274f48 JM |
1228 | res = dfs_check_chans_radar(iface, start_chan_idx, n_chans); |
1229 | if (res) | |
1230 | return res; | |
1231 | if (start_chan_idx1 >= 0 && n_chans1 > 0) | |
1232 | res = dfs_check_chans_radar(iface, start_chan_idx1, n_chans1); | |
1233 | return res; | |
3d7ad2f6 | 1234 | } |
c13578c3 AK |
1235 | |
1236 | ||
1237 | int hostapd_dfs_start_cac(struct hostapd_iface *iface, int freq, | |
1238 | int ht_enabled, int chan_offset, int chan_width, | |
1239 | int cf1, int cf2) | |
1240 | { | |
02292618 HW |
1241 | /* This is called when the driver indicates that an offloaded DFS has |
1242 | * started CAC. */ | |
1243 | hostapd_set_state(iface, HAPD_IFACE_DFS); | |
1244 | /* TODO: How to check CAC time for ETSI weather channels? */ | |
1245 | iface->dfs_cac_ms = 60000; | |
c13578c3 AK |
1246 | wpa_msg(iface->bss[0]->msg_ctx, MSG_INFO, DFS_EVENT_CAC_START |
1247 | "freq=%d chan=%d chan_offset=%d width=%d seg0=%d " | |
1248 | "seg1=%d cac_time=%ds", | |
02292618 HW |
1249 | freq, (freq - 5000) / 5, chan_offset, chan_width, cf1, cf2, |
1250 | iface->dfs_cac_ms / 1000); | |
c13578c3 | 1251 | iface->cac_started = 1; |
02292618 | 1252 | os_get_reltime(&iface->dfs_cac_start); |
c13578c3 AK |
1253 | return 0; |
1254 | } | |
1255 | ||
1256 | ||
1257 | /* | |
1258 | * Main DFS handler for offloaded case. | |
1259 | * 2 - continue channel/AP setup for non-DFS channel | |
1260 | * 1 - continue channel/AP setup for DFS channel | |
1261 | * 0 - channel/AP setup will be continued after CAC | |
1262 | * -1 - hit critical error | |
1263 | */ | |
1264 | int hostapd_handle_dfs_offload(struct hostapd_iface *iface) | |
1265 | { | |
1266 | wpa_printf(MSG_DEBUG, "%s: iface->cac_started: %d", | |
1267 | __func__, iface->cac_started); | |
1268 | ||
1269 | /* | |
1270 | * If DFS has already been started, then we are being called from a | |
1271 | * callback to continue AP/channel setup. Reset the CAC start flag and | |
1272 | * return. | |
1273 | */ | |
1274 | if (iface->cac_started) { | |
1275 | wpa_printf(MSG_DEBUG, "%s: iface->cac_started: %d", | |
1276 | __func__, iface->cac_started); | |
1277 | iface->cac_started = 0; | |
1278 | return 1; | |
1279 | } | |
1280 | ||
d239ab39 | 1281 | if (ieee80211_is_dfs(iface->freq, iface->hw_features, |
1282 | iface->num_hw_features)) { | |
c13578c3 AK |
1283 | wpa_printf(MSG_DEBUG, "%s: freq %d MHz requires DFS", |
1284 | __func__, iface->freq); | |
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | wpa_printf(MSG_DEBUG, | |
1289 | "%s: freq %d MHz does not require DFS. Continue channel/AP setup", | |
1290 | __func__, iface->freq); | |
1291 | return 2; | |
1292 | } |