1 /*
2 * Operating classes
3 * Copyright(c) 2015 Intel Deutschland GmbH
4 * Contact Information:
5 * Intel Linux Wireless <ilw@linux.intel.com>
6 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
7 *
8 * This software may be distributed under the terms of the BSD license.
9 * See README for more details.
10 */
11
12 #include "utils/includes.h"
13
14 #include "utils/common.h"
15 #include "common/ieee802_11_common.h"
16 #include "wpa_supplicant_i.h"
17
18
allow_channel(struct hostapd_hw_modes * mode,u8 chan,unsigned int * flags)19 static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode, u8 chan,
20 unsigned int *flags)
21 {
22 int i;
23
24 for (i = 0; i < mode->num_channels; i++) {
25 if (mode->channels[i].chan == chan)
26 break;
27 }
28
29 if (i == mode->num_channels ||
30 (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED))
31 return NOT_ALLOWED;
32
33 if (flags)
34 *flags = mode->channels[i].flag;
35
36 if (mode->channels[i].flag & HOSTAPD_CHAN_NO_IR)
37 return NO_IR;
38
39 return ALLOWED;
40 }
41
42
get_center_80mhz(struct hostapd_hw_modes * mode,u8 channel)43 static int get_center_80mhz(struct hostapd_hw_modes *mode, u8 channel)
44 {
45 u8 center_channels[] = { 42, 58, 106, 122, 138, 155 };
46 size_t i;
47
48 if (mode->mode != HOSTAPD_MODE_IEEE80211A)
49 return 0;
50
51 for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
52 /*
53 * In 80 MHz, the bandwidth "spans" 12 channels (e.g., 36-48),
54 * so the center channel is 6 channels away from the start/end.
55 */
56 if (channel >= center_channels[i] - 6 &&
57 channel <= center_channels[i] + 6)
58 return center_channels[i];
59 }
60
61 return 0;
62 }
63
64
verify_80mhz(struct hostapd_hw_modes * mode,u8 channel)65 static enum chan_allowed verify_80mhz(struct hostapd_hw_modes *mode, u8 channel)
66 {
67 u8 center_chan;
68 unsigned int i;
69 unsigned int no_ir = 0;
70
71 center_chan = get_center_80mhz(mode, channel);
72 if (!center_chan)
73 return NOT_ALLOWED;
74
75 /* check all the channels are available */
76 for (i = 0; i < 4; i++) {
77 unsigned int flags;
78 u8 adj_chan = center_chan - 6 + i * 4;
79
80 if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
81 return NOT_ALLOWED;
82
83 if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_70)) ||
84 (i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_50)) ||
85 (i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_30)) ||
86 (i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_10)))
87 return NOT_ALLOWED;
88
89 if (flags & HOSTAPD_CHAN_NO_IR)
90 no_ir = 1;
91 }
92
93 if (no_ir)
94 return NO_IR;
95
96 return ALLOWED;
97 }
98
99
get_center_160mhz(struct hostapd_hw_modes * mode,u8 channel)100 static int get_center_160mhz(struct hostapd_hw_modes *mode, u8 channel)
101 {
102 u8 center_channels[] = { 50, 114 };
103 unsigned int i;
104
105 if (mode->mode != HOSTAPD_MODE_IEEE80211A)
106 return 0;
107
108 for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
109 /*
110 * In 160 MHz, the bandwidth "spans" 28 channels (e.g., 36-64),
111 * so the center channel is 14 channels away from the start/end.
112 */
113 if (channel >= center_channels[i] - 14 &&
114 channel <= center_channels[i] + 14)
115 return center_channels[i];
116 }
117
118 return 0;
119 }
120
121
verify_160mhz(struct hostapd_hw_modes * mode,u8 channel)122 static enum chan_allowed verify_160mhz(struct hostapd_hw_modes *mode,
123 u8 channel)
124 {
125 u8 center_chan;
126 unsigned int i;
127 unsigned int no_ir = 0;
128
129 center_chan = get_center_160mhz(mode, channel);
130 if (!center_chan)
131 return NOT_ALLOWED;
132
133 /* Check all the channels are available */
134 for (i = 0; i < 8; i++) {
135 unsigned int flags;
136 u8 adj_chan = center_chan - 14 + i * 4;
137
138 if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
139 return NOT_ALLOWED;
140
141 if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_150)) ||
142 (i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_130)) ||
143 (i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_110)) ||
144 (i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_90)) ||
145 (i == 4 && !(flags & HOSTAPD_CHAN_VHT_90_70)) ||
146 (i == 5 && !(flags & HOSTAPD_CHAN_VHT_110_50)) ||
147 (i == 6 && !(flags & HOSTAPD_CHAN_VHT_130_30)) ||
148 (i == 7 && !(flags & HOSTAPD_CHAN_VHT_150_10)))
149 return NOT_ALLOWED;
150
151 if (flags & HOSTAPD_CHAN_NO_IR)
152 no_ir = 1;
153 }
154
155 if (no_ir)
156 return NO_IR;
157
158 return ALLOWED;
159 }
160
161
verify_channel(struct hostapd_hw_modes * mode,u8 channel,u8 bw)162 enum chan_allowed verify_channel(struct hostapd_hw_modes *mode, u8 channel,
163 u8 bw)
164 {
165 unsigned int flag = 0;
166 enum chan_allowed res, res2;
167
168 res2 = res = allow_channel(mode, channel, &flag);
169 if (bw == BW40MINUS) {
170 if (!(flag & HOSTAPD_CHAN_HT40MINUS))
171 return NOT_ALLOWED;
172 res2 = allow_channel(mode, channel - 4, NULL);
173 } else if (bw == BW40PLUS) {
174 if (!(flag & HOSTAPD_CHAN_HT40PLUS))
175 return NOT_ALLOWED;
176 res2 = allow_channel(mode, channel + 4, NULL);
177 } else if (bw == BW80) {
178 /*
179 * channel is a center channel and as such, not necessarily a
180 * valid 20 MHz channels. Override earlier allow_channel()
181 * result and use only the 80 MHz specific version.
182 */
183 res2 = res = verify_80mhz(mode, channel);
184 } else if (bw == BW160) {
185 /*
186 * channel is a center channel and as such, not necessarily a
187 * valid 20 MHz channels. Override earlier allow_channel()
188 * result and use only the 160 MHz specific version.
189 */
190 res2 = res = verify_160mhz(mode, channel);
191 } else if (bw == BW80P80) {
192 /*
193 * channel is a center channel and as such, not necessarily a
194 * valid 20 MHz channels. Override earlier allow_channel()
195 * result and use only the 80 MHz specific version.
196 */
197 res2 = res = verify_80mhz(mode, channel);
198 }
199
200 if (res == NOT_ALLOWED || res2 == NOT_ALLOWED)
201 return NOT_ALLOWED;
202
203 if (res == NO_IR || res2 == NO_IR)
204 return NO_IR;
205
206 return ALLOWED;
207 }
208
209
wpas_op_class_supported(struct wpa_supplicant * wpa_s,const struct oper_class_map * op_class)210 static int wpas_op_class_supported(struct wpa_supplicant *wpa_s,
211 const struct oper_class_map *op_class)
212 {
213 int chan;
214 size_t i;
215 struct hostapd_hw_modes *mode;
216 int found;
217
218 mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op_class->mode);
219 if (!mode)
220 return 0;
221
222 if (op_class->op_class == 128) {
223 u8 channels[] = { 42, 58, 106, 122, 138, 155 };
224
225 for (i = 0; i < ARRAY_SIZE(channels); i++) {
226 if (verify_channel(mode, channels[i], op_class->bw) !=
227 NOT_ALLOWED)
228 return 1;
229 }
230
231 return 0;
232 }
233
234 if (op_class->op_class == 129) {
235 /* Check if either 160 MHz channels is allowed */
236 return verify_channel(mode, 50, op_class->bw) != NOT_ALLOWED ||
237 verify_channel(mode, 114, op_class->bw) != NOT_ALLOWED;
238 }
239
240 if (op_class->op_class == 130) {
241 /* Need at least two non-contiguous 80 MHz segments */
242 found = 0;
243
244 if (verify_channel(mode, 42, op_class->bw) != NOT_ALLOWED ||
245 verify_channel(mode, 58, op_class->bw) != NOT_ALLOWED)
246 found++;
247 if (verify_channel(mode, 106, op_class->bw) != NOT_ALLOWED ||
248 verify_channel(mode, 122, op_class->bw) != NOT_ALLOWED ||
249 verify_channel(mode, 138, op_class->bw) != NOT_ALLOWED)
250 found++;
251 if (verify_channel(mode, 106, op_class->bw) != NOT_ALLOWED &&
252 verify_channel(mode, 138, op_class->bw) != NOT_ALLOWED)
253 found++;
254 if (verify_channel(mode, 155, op_class->bw) != NOT_ALLOWED)
255 found++;
256
257 if (found >= 2)
258 return 1;
259
260 return 0;
261 }
262
263 found = 0;
264 for (chan = op_class->min_chan; chan <= op_class->max_chan;
265 chan += op_class->inc) {
266 if (verify_channel(mode, chan, op_class->bw) != NOT_ALLOWED) {
267 found = 1;
268 break;
269 }
270 }
271
272 return found;
273 }
274
275
wpas_supp_op_class_ie(struct wpa_supplicant * wpa_s,int freq,u8 * pos,size_t len)276 size_t wpas_supp_op_class_ie(struct wpa_supplicant *wpa_s, int freq, u8 *pos,
277 size_t len)
278 {
279 struct wpabuf *buf;
280 u8 op, current, chan;
281 u8 *ie_len;
282 size_t res;
283
284 /*
285 * Assume 20 MHz channel for now.
286 * TODO: Use the secondary channel and VHT channel width that will be
287 * used after association.
288 */
289 if (ieee80211_freq_to_channel_ext(freq, 0, VHT_CHANWIDTH_USE_HT,
290 ¤t, &chan) == NUM_HOSTAPD_MODES)
291 return 0;
292
293 /*
294 * Need 3 bytes for EID, length, and current operating class, plus
295 * 1 byte for every other supported operating class.
296 */
297 buf = wpabuf_alloc(global_op_class_size + 3);
298 if (!buf)
299 return 0;
300
301 wpabuf_put_u8(buf, WLAN_EID_SUPPORTED_OPERATING_CLASSES);
302 /* Will set the length later, putting a placeholder */
303 ie_len = wpabuf_put(buf, 1);
304 wpabuf_put_u8(buf, current);
305
306 for (op = 0; global_op_class[op].op_class; op++) {
307 if (wpas_op_class_supported(wpa_s, &global_op_class[op]))
308 wpabuf_put_u8(buf, global_op_class[op].op_class);
309 }
310
311 *ie_len = wpabuf_len(buf) - 2;
312 if (*ie_len < 2 || wpabuf_len(buf) > len) {
313 wpa_printf(MSG_ERROR,
314 "Failed to add supported operating classes IE");
315 res = 0;
316 } else {
317 os_memcpy(pos, wpabuf_head(buf), wpabuf_len(buf));
318 res = wpabuf_len(buf);
319 wpa_hexdump_buf(MSG_DEBUG,
320 "Added supported operating classes IE", buf);
321 }
322
323 wpabuf_free(buf);
324 return res;
325 }
326