1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * spectrum management
4 *
5 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
6 * Copyright 2002-2005, Instant802 Networks, Inc.
7 * Copyright 2005-2006, Devicescape Software, Inc.
8 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
9 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
10 * Copyright 2007-2008, Intel Corporation
11 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
12 * Copyright (C) 2018, 2020, 2022-2023 Intel Corporation
13 */
14
15#include <linux/ieee80211.h>
16#include <net/cfg80211.h>
17#include <net/mac80211.h>
18#include "ieee80211_i.h"
19#include "sta_info.h"
20#include "wme.h"
21
22static bool
23wbcs_elem_to_chandef(const struct ieee80211_wide_bw_chansw_ie *wbcs_elem,
24 struct cfg80211_chan_def *chandef)
25{
26 u8 ccfs0 = wbcs_elem->new_center_freq_seg0;
27 u8 ccfs1 = wbcs_elem->new_center_freq_seg1;
28 u32 cf0 = ieee80211_channel_to_frequency(chan: ccfs0, band: chandef->chan->band);
29 u32 cf1 = ieee80211_channel_to_frequency(chan: ccfs1, band: chandef->chan->band);
30
31 switch (wbcs_elem->new_channel_width) {
32 case IEEE80211_VHT_CHANWIDTH_160MHZ:
33 /* deprecated encoding */
34 chandef->width = NL80211_CHAN_WIDTH_160;
35 chandef->center_freq1 = cf0;
36 break;
37 case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
38 /* deprecated encoding */
39 chandef->width = NL80211_CHAN_WIDTH_80P80;
40 chandef->center_freq1 = cf0;
41 chandef->center_freq2 = cf1;
42 break;
43 case IEEE80211_VHT_CHANWIDTH_80MHZ:
44 chandef->width = NL80211_CHAN_WIDTH_80;
45 chandef->center_freq1 = cf0;
46
47 if (ccfs1) {
48 u8 diff = abs(ccfs0 - ccfs1);
49
50 if (diff == 8) {
51 chandef->width = NL80211_CHAN_WIDTH_160;
52 chandef->center_freq1 = cf1;
53 } else if (diff > 8) {
54 chandef->width = NL80211_CHAN_WIDTH_80P80;
55 chandef->center_freq2 = cf1;
56 }
57 }
58 break;
59 case IEEE80211_VHT_CHANWIDTH_USE_HT:
60 default:
61 /* If the WBCS Element is present, new channel bandwidth is
62 * at least 40 MHz.
63 */
64 chandef->width = NL80211_CHAN_WIDTH_40;
65 chandef->center_freq1 = cf0;
66 break;
67 }
68
69 return cfg80211_chandef_valid(chandef);
70}
71
72static void
73validate_chandef_by_ht_vht_oper(struct ieee80211_sub_if_data *sdata,
74 struct ieee80211_conn_settings *conn,
75 u32 vht_cap_info,
76 struct cfg80211_chan_def *chandef)
77{
78 u32 control_freq, center_freq1, center_freq2;
79 enum nl80211_chan_width chan_width;
80 struct ieee80211_ht_operation ht_oper;
81 struct ieee80211_vht_operation vht_oper;
82
83 if (conn->mode < IEEE80211_CONN_MODE_HT ||
84 conn->bw_limit < IEEE80211_CONN_BW_LIMIT_40) {
85 chandef->chan = NULL;
86 return;
87 }
88
89 control_freq = chandef->chan->center_freq;
90 center_freq1 = chandef->center_freq1;
91 center_freq2 = chandef->center_freq2;
92 chan_width = chandef->width;
93
94 ht_oper.primary_chan = ieee80211_frequency_to_channel(freq: control_freq);
95 if (control_freq != center_freq1)
96 ht_oper.ht_param = control_freq > center_freq1 ?
97 IEEE80211_HT_PARAM_CHA_SEC_BELOW :
98 IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
99 else
100 ht_oper.ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
101
102 ieee80211_chandef_ht_oper(ht_oper: &ht_oper, chandef);
103
104 if (conn->mode < IEEE80211_CONN_MODE_VHT)
105 return;
106
107 vht_oper.center_freq_seg0_idx =
108 ieee80211_frequency_to_channel(freq: center_freq1);
109 vht_oper.center_freq_seg1_idx = center_freq2 ?
110 ieee80211_frequency_to_channel(freq: center_freq2) : 0;
111
112 switch (chan_width) {
113 case NL80211_CHAN_WIDTH_320:
114 WARN_ON(1);
115 break;
116 case NL80211_CHAN_WIDTH_160:
117 vht_oper.chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
118 vht_oper.center_freq_seg1_idx = vht_oper.center_freq_seg0_idx;
119 vht_oper.center_freq_seg0_idx +=
120 control_freq < center_freq1 ? -8 : 8;
121 break;
122 case NL80211_CHAN_WIDTH_80P80:
123 vht_oper.chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
124 break;
125 case NL80211_CHAN_WIDTH_80:
126 vht_oper.chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
127 break;
128 default:
129 vht_oper.chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
130 break;
131 }
132
133 ht_oper.operation_mode =
134 le16_encode_bits(v: vht_oper.center_freq_seg1_idx,
135 IEEE80211_HT_OP_MODE_CCFS2_MASK);
136
137 if (!ieee80211_chandef_vht_oper(hw: &sdata->local->hw, vht_cap_info,
138 oper: &vht_oper, htop: &ht_oper, chandef))
139 chandef->chan = NULL;
140}
141
142static void
143validate_chandef_by_6ghz_he_eht_oper(struct ieee80211_sub_if_data *sdata,
144 struct ieee80211_conn_settings *conn,
145 struct cfg80211_chan_def *chandef)
146{
147 struct ieee80211_local *local = sdata->local;
148 u32 control_freq, center_freq1, center_freq2;
149 enum nl80211_chan_width chan_width;
150 struct {
151 struct ieee80211_he_operation _oper;
152 struct ieee80211_he_6ghz_oper _6ghz_oper;
153 } __packed he;
154 struct {
155 struct ieee80211_eht_operation _oper;
156 struct ieee80211_eht_operation_info _oper_info;
157 } __packed eht;
158
159 if (conn->mode < IEEE80211_CONN_MODE_HE) {
160 chandef->chan = NULL;
161 return;
162 }
163
164 control_freq = chandef->chan->center_freq;
165 center_freq1 = chandef->center_freq1;
166 center_freq2 = chandef->center_freq2;
167 chan_width = chandef->width;
168
169 he._oper.he_oper_params =
170 le32_encode_bits(v: 1, IEEE80211_HE_OPERATION_6GHZ_OP_INFO);
171 he._6ghz_oper.primary =
172 ieee80211_frequency_to_channel(freq: control_freq);
173 he._6ghz_oper.ccfs0 = ieee80211_frequency_to_channel(freq: center_freq1);
174 he._6ghz_oper.ccfs1 = center_freq2 ?
175 ieee80211_frequency_to_channel(freq: center_freq2) : 0;
176
177 switch (chan_width) {
178 case NL80211_CHAN_WIDTH_320:
179 he._6ghz_oper.ccfs1 = he._6ghz_oper.ccfs0;
180 he._6ghz_oper.ccfs0 += control_freq < center_freq1 ? -16 : 16;
181 he._6ghz_oper.control = IEEE80211_EHT_OPER_CHAN_WIDTH_320MHZ;
182 break;
183 case NL80211_CHAN_WIDTH_160:
184 he._6ghz_oper.ccfs1 = he._6ghz_oper.ccfs0;
185 he._6ghz_oper.ccfs0 += control_freq < center_freq1 ? -8 : 8;
186 fallthrough;
187 case NL80211_CHAN_WIDTH_80P80:
188 he._6ghz_oper.control =
189 IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ;
190 break;
191 case NL80211_CHAN_WIDTH_80:
192 he._6ghz_oper.control =
193 IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ;
194 break;
195 case NL80211_CHAN_WIDTH_40:
196 he._6ghz_oper.control =
197 IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_40MHZ;
198 break;
199 default:
200 he._6ghz_oper.control =
201 IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_20MHZ;
202 break;
203 }
204
205 if (conn->mode < IEEE80211_CONN_MODE_EHT) {
206 if (!ieee80211_chandef_he_6ghz_oper(local, he_oper: &he._oper,
207 NULL, chandef))
208 chandef->chan = NULL;
209 } else {
210 eht._oper.params = IEEE80211_EHT_OPER_INFO_PRESENT;
211 eht._oper_info.control = he._6ghz_oper.control;
212 eht._oper_info.ccfs0 = he._6ghz_oper.ccfs0;
213 eht._oper_info.ccfs1 = he._6ghz_oper.ccfs1;
214
215 if (!ieee80211_chandef_he_6ghz_oper(local, he_oper: &he._oper,
216 eht_oper: &eht._oper, chandef))
217 chandef->chan = NULL;
218 }
219}
220
221int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
222 struct ieee802_11_elems *elems,
223 enum nl80211_band current_band,
224 u32 vht_cap_info,
225 struct ieee80211_conn_settings *conn,
226 u8 *bssid,
227 struct ieee80211_csa_ie *csa_ie)
228{
229 enum nl80211_band new_band = current_band;
230 int new_freq;
231 u8 new_chan_no = 0, new_op_class = 0;
232 struct ieee80211_channel *new_chan;
233 struct cfg80211_chan_def new_chandef = {};
234 const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
235 const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
236 const struct ieee80211_bandwidth_indication *bwi;
237 const struct ieee80211_ext_chansw_ie *ext_chansw_elem;
238 int secondary_channel_offset = -1;
239
240 memset(csa_ie, 0, sizeof(*csa_ie));
241
242 sec_chan_offs = elems->sec_chan_offs;
243 wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
244 bwi = elems->bandwidth_indication;
245 ext_chansw_elem = elems->ext_chansw_ie;
246
247 if (conn->mode < IEEE80211_CONN_MODE_HT ||
248 conn->bw_limit < IEEE80211_CONN_BW_LIMIT_40) {
249 sec_chan_offs = NULL;
250 wide_bw_chansw_ie = NULL;
251 }
252
253 if (conn->mode < IEEE80211_CONN_MODE_VHT)
254 wide_bw_chansw_ie = NULL;
255
256 if (ext_chansw_elem) {
257 new_op_class = ext_chansw_elem->new_operating_class;
258
259 if (!ieee80211_operating_class_to_band(operating_class: new_op_class, band: &new_band)) {
260 new_op_class = 0;
261 sdata_info(sdata, "cannot understand ECSA IE operating class, %d, ignoring\n",
262 ext_chansw_elem->new_operating_class);
263 } else {
264 new_chan_no = ext_chansw_elem->new_ch_num;
265 csa_ie->count = ext_chansw_elem->count;
266 csa_ie->mode = ext_chansw_elem->mode;
267 }
268 }
269
270 if (!new_op_class && elems->ch_switch_ie) {
271 new_chan_no = elems->ch_switch_ie->new_ch_num;
272 csa_ie->count = elems->ch_switch_ie->count;
273 csa_ie->mode = elems->ch_switch_ie->mode;
274 }
275
276 /* nothing here we understand */
277 if (!new_chan_no)
278 return 1;
279
280 /* Mesh Channel Switch Parameters Element */
281 if (elems->mesh_chansw_params_ie) {
282 csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
283 csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
284 csa_ie->pre_value = le16_to_cpu(
285 elems->mesh_chansw_params_ie->mesh_pre_value);
286
287 if (elems->mesh_chansw_params_ie->mesh_flags &
288 WLAN_EID_CHAN_SWITCH_PARAM_REASON)
289 csa_ie->reason_code = le16_to_cpu(
290 elems->mesh_chansw_params_ie->mesh_reason);
291 }
292
293 new_freq = ieee80211_channel_to_frequency(chan: new_chan_no, band: new_band);
294 new_chan = ieee80211_get_channel(wiphy: sdata->local->hw.wiphy, freq: new_freq);
295 if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
296 sdata_info(sdata,
297 "BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
298 bssid, new_freq);
299 return -EINVAL;
300 }
301
302 if (sec_chan_offs) {
303 secondary_channel_offset = sec_chan_offs->sec_chan_offs;
304 } else if (conn->mode >= IEEE80211_CONN_MODE_HT) {
305 /* If the secondary channel offset IE is not present,
306 * we can't know what's the post-CSA offset, so the
307 * best we can do is use 20MHz.
308 */
309 secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
310 }
311
312 switch (secondary_channel_offset) {
313 default:
314 /* secondary_channel_offset was present but is invalid */
315 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
316 cfg80211_chandef_create(chandef: &csa_ie->chanreq.oper, channel: new_chan,
317 chantype: NL80211_CHAN_HT20);
318 break;
319 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
320 cfg80211_chandef_create(chandef: &csa_ie->chanreq.oper, channel: new_chan,
321 chantype: NL80211_CHAN_HT40PLUS);
322 break;
323 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
324 cfg80211_chandef_create(chandef: &csa_ie->chanreq.oper, channel: new_chan,
325 chantype: NL80211_CHAN_HT40MINUS);
326 break;
327 case -1:
328 cfg80211_chandef_create(chandef: &csa_ie->chanreq.oper, channel: new_chan,
329 chantype: NL80211_CHAN_NO_HT);
330 /* keep width for 5/10 MHz channels */
331 switch (sdata->vif.bss_conf.chanreq.oper.width) {
332 case NL80211_CHAN_WIDTH_5:
333 case NL80211_CHAN_WIDTH_10:
334 csa_ie->chanreq.oper.width =
335 sdata->vif.bss_conf.chanreq.oper.width;
336 break;
337 default:
338 break;
339 }
340 break;
341 }
342
343 /* parse one of the Elements to build a new chandef */
344 memset(&new_chandef, 0, sizeof(new_chandef));
345 new_chandef.chan = new_chan;
346 if (bwi) {
347 /* start with the CSA one */
348 new_chandef = csa_ie->chanreq.oper;
349 /* and update the width accordingly */
350 ieee80211_chandef_eht_oper(info: &bwi->info, chandef: &new_chandef);
351 } else if (!wide_bw_chansw_ie || !wbcs_elem_to_chandef(wbcs_elem: wide_bw_chansw_ie,
352 chandef: &new_chandef)) {
353 if (!ieee80211_operating_class_to_chandef(operating_class: new_op_class, chan: new_chan,
354 chandef: &new_chandef))
355 new_chandef = csa_ie->chanreq.oper;
356 }
357
358 /* check if the new chandef fits the capabilities */
359 if (new_band == NL80211_BAND_6GHZ)
360 validate_chandef_by_6ghz_he_eht_oper(sdata, conn, chandef: &new_chandef);
361 else
362 validate_chandef_by_ht_vht_oper(sdata, conn, vht_cap_info,
363 chandef: &new_chandef);
364
365 /* if data is there validate the bandwidth & use it */
366 if (new_chandef.chan) {
367 if (conn->bw_limit < IEEE80211_CONN_BW_LIMIT_320 &&
368 new_chandef.width == NL80211_CHAN_WIDTH_320)
369 ieee80211_chandef_downgrade(chandef: &new_chandef, NULL);
370
371 if (conn->bw_limit < IEEE80211_CONN_BW_LIMIT_160 &&
372 (new_chandef.width == NL80211_CHAN_WIDTH_80P80 ||
373 new_chandef.width == NL80211_CHAN_WIDTH_160))
374 ieee80211_chandef_downgrade(chandef: &new_chandef, NULL);
375
376 if (!cfg80211_chandef_compatible(chandef1: &new_chandef,
377 chandef2: &csa_ie->chanreq.oper)) {
378 sdata_info(sdata,
379 "BSS %pM: CSA has inconsistent channel data, disconnecting\n",
380 bssid);
381 return -EINVAL;
382 }
383
384 csa_ie->chanreq.oper = new_chandef;
385 }
386
387 if (elems->max_channel_switch_time)
388 csa_ie->max_switch_time =
389 (elems->max_channel_switch_time[0] << 0) |
390 (elems->max_channel_switch_time[1] << 8) |
391 (elems->max_channel_switch_time[2] << 16);
392
393 return 0;
394}
395
396static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
397 struct ieee80211_msrment_ie *request_ie,
398 const u8 *da, const u8 *bssid,
399 u8 dialog_token)
400{
401 struct ieee80211_local *local = sdata->local;
402 struct sk_buff *skb;
403 struct ieee80211_mgmt *msr_report;
404
405 skb = dev_alloc_skb(length: sizeof(*msr_report) + local->hw.extra_tx_headroom +
406 sizeof(struct ieee80211_msrment_ie));
407 if (!skb)
408 return;
409
410 skb_reserve(skb, len: local->hw.extra_tx_headroom);
411 msr_report = skb_put_zero(skb, len: 24);
412 memcpy(msr_report->da, da, ETH_ALEN);
413 memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
414 memcpy(msr_report->bssid, bssid, ETH_ALEN);
415 msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
416 IEEE80211_STYPE_ACTION);
417
418 skb_put(skb, len: 1 + sizeof(msr_report->u.action.u.measurement));
419 msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
420 msr_report->u.action.u.measurement.action_code =
421 WLAN_ACTION_SPCT_MSR_RPRT;
422 msr_report->u.action.u.measurement.dialog_token = dialog_token;
423
424 msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
425 msr_report->u.action.u.measurement.length =
426 sizeof(struct ieee80211_msrment_ie);
427
428 memset(&msr_report->u.action.u.measurement.msr_elem, 0,
429 sizeof(struct ieee80211_msrment_ie));
430 msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
431 msr_report->u.action.u.measurement.msr_elem.mode |=
432 IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
433 msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
434
435 ieee80211_tx_skb(sdata, skb);
436}
437
438void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
439 struct ieee80211_mgmt *mgmt,
440 size_t len)
441{
442 /*
443 * Ignoring measurement request is spec violation.
444 * Mandatory measurements must be reported optional
445 * measurements might be refused or reported incapable
446 * For now just refuse
447 * TODO: Answer basic measurement as unmeasured
448 */
449 ieee80211_send_refuse_measurement_request(sdata,
450 request_ie: &mgmt->u.action.u.measurement.msr_elem,
451 da: mgmt->sa, bssid: mgmt->bssid,
452 dialog_token: mgmt->u.action.u.measurement.dialog_token);
453}
454

source code of linux/net/mac80211/spectmgmt.c