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Commit | Line | Data |
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59bbb6f7 JB |
1 | /* |
2 | * This file contains helper code to handle channel | |
3 | * settings and keeping track of what is possible at | |
4 | * any point in time. | |
5 | * | |
6 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
7 | */ | |
8 | ||
54858ee5 | 9 | #include <linux/export.h> |
59bbb6f7 JB |
10 | #include <net/cfg80211.h> |
11 | #include "core.h" | |
e35e4d28 | 12 | #include "rdev-ops.h" |
59bbb6f7 | 13 | |
3d9d1d66 JB |
14 | void cfg80211_chandef_create(struct cfg80211_chan_def *chandef, |
15 | struct ieee80211_channel *chan, | |
16 | enum nl80211_channel_type chan_type) | |
9236d838 | 17 | { |
3d9d1d66 JB |
18 | if (WARN_ON(!chan)) |
19 | return; | |
9236d838 | 20 | |
3d9d1d66 JB |
21 | chandef->chan = chan; |
22 | chandef->center_freq2 = 0; | |
4ee3e063 | 23 | |
3d9d1d66 JB |
24 | switch (chan_type) { |
25 | case NL80211_CHAN_NO_HT: | |
26 | chandef->width = NL80211_CHAN_WIDTH_20_NOHT; | |
27 | chandef->center_freq1 = chan->center_freq; | |
28 | break; | |
29 | case NL80211_CHAN_HT20: | |
30 | chandef->width = NL80211_CHAN_WIDTH_20; | |
31 | chandef->center_freq1 = chan->center_freq; | |
32 | break; | |
9236d838 | 33 | case NL80211_CHAN_HT40PLUS: |
3d9d1d66 JB |
34 | chandef->width = NL80211_CHAN_WIDTH_40; |
35 | chandef->center_freq1 = chan->center_freq + 10; | |
09a02fdb | 36 | break; |
9236d838 | 37 | case NL80211_CHAN_HT40MINUS: |
3d9d1d66 JB |
38 | chandef->width = NL80211_CHAN_WIDTH_40; |
39 | chandef->center_freq1 = chan->center_freq - 10; | |
09a02fdb | 40 | break; |
9236d838 | 41 | default: |
3d9d1d66 JB |
42 | WARN_ON(1); |
43 | } | |
44 | } | |
45 | EXPORT_SYMBOL(cfg80211_chandef_create); | |
46 | ||
47 | bool cfg80211_chan_def_valid(const struct cfg80211_chan_def *chandef) | |
48 | { | |
49 | u32 control_freq; | |
50 | ||
51 | if (!chandef->chan) | |
52 | return false; | |
53 | ||
54 | control_freq = chandef->chan->center_freq; | |
55 | ||
56 | switch (chandef->width) { | |
57 | case NL80211_CHAN_WIDTH_20: | |
58 | case NL80211_CHAN_WIDTH_20_NOHT: | |
59 | if (chandef->center_freq1 != control_freq) | |
60 | return false; | |
61 | if (chandef->center_freq2) | |
62 | return false; | |
63 | break; | |
64 | case NL80211_CHAN_WIDTH_40: | |
65 | if (chandef->center_freq1 != control_freq + 10 && | |
66 | chandef->center_freq1 != control_freq - 10) | |
67 | return false; | |
68 | if (chandef->center_freq2) | |
69 | return false; | |
70 | break; | |
71 | case NL80211_CHAN_WIDTH_80P80: | |
72 | if (chandef->center_freq1 != control_freq + 30 && | |
73 | chandef->center_freq1 != control_freq + 10 && | |
74 | chandef->center_freq1 != control_freq - 10 && | |
75 | chandef->center_freq1 != control_freq - 30) | |
76 | return false; | |
77 | if (!chandef->center_freq2) | |
78 | return false; | |
79 | break; | |
80 | case NL80211_CHAN_WIDTH_80: | |
81 | if (chandef->center_freq1 != control_freq + 30 && | |
82 | chandef->center_freq1 != control_freq + 10 && | |
83 | chandef->center_freq1 != control_freq - 10 && | |
84 | chandef->center_freq1 != control_freq - 30) | |
85 | return false; | |
86 | if (chandef->center_freq2) | |
87 | return false; | |
88 | break; | |
89 | case NL80211_CHAN_WIDTH_160: | |
90 | if (chandef->center_freq1 != control_freq + 70 && | |
91 | chandef->center_freq1 != control_freq + 50 && | |
92 | chandef->center_freq1 != control_freq + 30 && | |
93 | chandef->center_freq1 != control_freq + 10 && | |
94 | chandef->center_freq1 != control_freq - 10 && | |
95 | chandef->center_freq1 != control_freq - 30 && | |
96 | chandef->center_freq1 != control_freq - 50 && | |
97 | chandef->center_freq1 != control_freq - 70) | |
98 | return false; | |
99 | if (chandef->center_freq2) | |
100 | return false; | |
101 | break; | |
102 | default: | |
103 | return false; | |
104 | } | |
105 | ||
106 | return true; | |
107 | } | |
108 | ||
109 | static void chandef_primary_freqs(const struct cfg80211_chan_def *c, | |
110 | int *pri40, int *pri80) | |
111 | { | |
112 | int tmp; | |
113 | ||
114 | switch (c->width) { | |
115 | case NL80211_CHAN_WIDTH_40: | |
116 | *pri40 = c->center_freq1; | |
117 | *pri80 = 0; | |
118 | break; | |
119 | case NL80211_CHAN_WIDTH_80: | |
120 | case NL80211_CHAN_WIDTH_80P80: | |
121 | *pri80 = c->center_freq1; | |
122 | /* n_P20 */ | |
123 | tmp = (30 + c->chan->center_freq - c->center_freq1)/20; | |
124 | /* n_P40 */ | |
125 | tmp /= 2; | |
126 | /* freq_P40 */ | |
127 | *pri40 = c->center_freq1 - 20 + 40 * tmp; | |
128 | break; | |
129 | case NL80211_CHAN_WIDTH_160: | |
130 | /* n_P20 */ | |
131 | tmp = (70 + c->chan->center_freq - c->center_freq1)/20; | |
132 | /* n_P40 */ | |
133 | tmp /= 2; | |
134 | /* freq_P40 */ | |
135 | *pri40 = c->center_freq1 - 60 + 40 * tmp; | |
136 | /* n_P80 */ | |
137 | tmp /= 2; | |
138 | *pri80 = c->center_freq1 - 40 + 80 * tmp; | |
139 | break; | |
140 | default: | |
141 | WARN_ON_ONCE(1); | |
142 | } | |
143 | } | |
144 | ||
145 | const struct cfg80211_chan_def * | |
146 | cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, | |
147 | const struct cfg80211_chan_def *c2) | |
148 | { | |
149 | u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80; | |
150 | ||
151 | /* If they are identical, return */ | |
152 | if (cfg80211_chandef_identical(c1, c2)) | |
153 | return c1; | |
154 | ||
155 | /* otherwise, must have same control channel */ | |
156 | if (c1->chan != c2->chan) | |
157 | return NULL; | |
158 | ||
159 | /* | |
160 | * If they have the same width, but aren't identical, | |
161 | * then they can't be compatible. | |
162 | */ | |
163 | if (c1->width == c2->width) | |
164 | return NULL; | |
165 | ||
166 | if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || | |
167 | c1->width == NL80211_CHAN_WIDTH_20) | |
168 | return c2; | |
169 | ||
170 | if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || | |
171 | c2->width == NL80211_CHAN_WIDTH_20) | |
172 | return c1; | |
173 | ||
174 | chandef_primary_freqs(c1, &c1_pri40, &c1_pri80); | |
175 | chandef_primary_freqs(c2, &c2_pri40, &c2_pri80); | |
176 | ||
177 | if (c1_pri40 != c2_pri40) | |
178 | return NULL; | |
179 | ||
180 | WARN_ON(!c1_pri80 && !c2_pri80); | |
181 | if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80) | |
182 | return NULL; | |
183 | ||
184 | if (c1->width > c2->width) | |
185 | return c1; | |
186 | return c2; | |
187 | } | |
188 | EXPORT_SYMBOL(cfg80211_chandef_compatible); | |
189 | ||
190 | bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, | |
191 | u32 center_freq, u32 bandwidth, | |
192 | u32 prohibited_flags) | |
193 | { | |
194 | struct ieee80211_channel *c; | |
195 | u32 freq; | |
196 | ||
197 | for (freq = center_freq - bandwidth/2 + 10; | |
198 | freq <= center_freq + bandwidth/2 - 10; | |
199 | freq += 20) { | |
200 | c = ieee80211_get_channel(wiphy, freq); | |
201 | if (!c || c->flags & prohibited_flags) | |
202 | return false; | |
9236d838 LR |
203 | } |
204 | ||
3d9d1d66 JB |
205 | return true; |
206 | } | |
207 | ||
208 | static bool cfg80211_check_beacon_chans(struct wiphy *wiphy, | |
209 | u32 center_freq, u32 bw) | |
210 | { | |
211 | return cfg80211_secondary_chans_ok(wiphy, center_freq, bw, | |
212 | IEEE80211_CHAN_DISABLED | | |
213 | IEEE80211_CHAN_PASSIVE_SCAN | | |
214 | IEEE80211_CHAN_NO_IBSS | | |
215 | IEEE80211_CHAN_RADAR); | |
216 | } | |
217 | ||
218 | bool cfg80211_reg_can_beacon(struct wiphy *wiphy, | |
219 | struct cfg80211_chan_def *chandef) | |
220 | { | |
221 | u32 width; | |
222 | bool res; | |
223 | ||
224 | trace_cfg80211_reg_can_beacon(wiphy, chandef); | |
225 | ||
226 | if (WARN_ON(!cfg80211_chan_def_valid(chandef))) { | |
4ee3e063 | 227 | trace_cfg80211_return_bool(false); |
9236d838 | 228 | return false; |
4ee3e063 | 229 | } |
9236d838 | 230 | |
3d9d1d66 JB |
231 | switch (chandef->width) { |
232 | case NL80211_CHAN_WIDTH_20_NOHT: | |
233 | case NL80211_CHAN_WIDTH_20: | |
234 | width = 20; | |
235 | break; | |
236 | case NL80211_CHAN_WIDTH_40: | |
237 | width = 40; | |
238 | break; | |
239 | case NL80211_CHAN_WIDTH_80: | |
240 | case NL80211_CHAN_WIDTH_80P80: | |
241 | width = 80; | |
242 | break; | |
243 | case NL80211_CHAN_WIDTH_160: | |
244 | width = 160; | |
245 | break; | |
246 | default: | |
247 | WARN_ON_ONCE(1); | |
4ee3e063 | 248 | trace_cfg80211_return_bool(false); |
9236d838 | 249 | return false; |
4ee3e063 | 250 | } |
3d9d1d66 JB |
251 | |
252 | res = cfg80211_check_beacon_chans(wiphy, chandef->center_freq1, width); | |
253 | ||
254 | if (res && chandef->center_freq2) | |
255 | res = cfg80211_check_beacon_chans(wiphy, chandef->center_freq2, | |
256 | width); | |
257 | ||
258 | trace_cfg80211_return_bool(res); | |
259 | return res; | |
9236d838 | 260 | } |
683b6d3b | 261 | EXPORT_SYMBOL(cfg80211_reg_can_beacon); |
9236d838 | 262 | |
e8c9bd5b | 263 | int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, |
683b6d3b | 264 | struct cfg80211_chan_def *chandef) |
9588bbd5 | 265 | { |
e8c9bd5b | 266 | if (!rdev->ops->set_monitor_channel) |
9588bbd5 | 267 | return -EOPNOTSUPP; |
4f03c1ed MK |
268 | if (!cfg80211_has_monitors_only(rdev)) |
269 | return -EBUSY; | |
9588bbd5 | 270 | |
683b6d3b | 271 | return rdev_set_monitor_channel(rdev, chandef); |
59bbb6f7 | 272 | } |
26ab9a0c MK |
273 | |
274 | void | |
8e95ea49 | 275 | cfg80211_get_chan_state(struct wireless_dev *wdev, |
26ab9a0c MK |
276 | struct ieee80211_channel **chan, |
277 | enum cfg80211_chan_mode *chanmode) | |
278 | { | |
279 | *chan = NULL; | |
280 | *chanmode = CHAN_MODE_UNDEFINED; | |
281 | ||
26ab9a0c MK |
282 | ASSERT_WDEV_LOCK(wdev); |
283 | ||
98104fde | 284 | if (wdev->netdev && !netif_running(wdev->netdev)) |
26ab9a0c MK |
285 | return; |
286 | ||
287 | switch (wdev->iftype) { | |
288 | case NL80211_IFTYPE_ADHOC: | |
289 | if (wdev->current_bss) { | |
290 | *chan = wdev->current_bss->pub.channel; | |
291 | *chanmode = wdev->ibss_fixed | |
292 | ? CHAN_MODE_SHARED | |
293 | : CHAN_MODE_EXCLUSIVE; | |
294 | return; | |
295 | } | |
296 | case NL80211_IFTYPE_STATION: | |
297 | case NL80211_IFTYPE_P2P_CLIENT: | |
298 | if (wdev->current_bss) { | |
299 | *chan = wdev->current_bss->pub.channel; | |
300 | *chanmode = CHAN_MODE_SHARED; | |
301 | return; | |
302 | } | |
303 | break; | |
304 | case NL80211_IFTYPE_AP: | |
305 | case NL80211_IFTYPE_P2P_GO: | |
f53594a0 FF |
306 | if (wdev->beacon_interval) { |
307 | *chan = wdev->channel; | |
308 | *chanmode = CHAN_MODE_SHARED; | |
309 | } | |
310 | return; | |
26ab9a0c | 311 | case NL80211_IFTYPE_MESH_POINT: |
f53594a0 FF |
312 | if (wdev->mesh_id_len) { |
313 | *chan = wdev->channel; | |
314 | *chanmode = CHAN_MODE_SHARED; | |
315 | } | |
26ab9a0c MK |
316 | return; |
317 | case NL80211_IFTYPE_MONITOR: | |
318 | case NL80211_IFTYPE_AP_VLAN: | |
319 | case NL80211_IFTYPE_WDS: | |
320 | /* these interface types don't really have a channel */ | |
321 | return; | |
98104fde JB |
322 | case NL80211_IFTYPE_P2P_DEVICE: |
323 | if (wdev->wiphy->features & | |
324 | NL80211_FEATURE_P2P_DEVICE_NEEDS_CHANNEL) | |
325 | *chanmode = CHAN_MODE_EXCLUSIVE; | |
326 | return; | |
26ab9a0c MK |
327 | case NL80211_IFTYPE_UNSPECIFIED: |
328 | case NUM_NL80211_IFTYPES: | |
329 | WARN_ON(1); | |
330 | } | |
331 | ||
332 | return; | |
333 | } |