net/wireless/chan.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * This file contains helper code to handle channel
   4  * settings and keeping track of what is possible at
   5  * any point in time.
   6  *
   7  * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  * Copyright 2018-2022  Intel Corporation
  10  */
  11
  12 #include <linux/export.h>
  13 #include <linux/bitfield.h>
  14 #include <net/cfg80211.h>
  15 #include "core.h"
  16 #include "rdev-ops.h"
  17
  18 static bool cfg80211_valid_60g_freq(u32 freq)
  19 {
  20         return freq >= 58320 && freq <= 70200;
  21 }
  22
  23 void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
  24                              struct ieee80211_channel *chan,
  25                              enum nl80211_channel_type chan_type)
  26 {
  27         if (WARN_ON(!chan))
  28                 return;
  29
  30         chandef->chan = chan;
  31         chandef->freq1_offset = chan->freq_offset;
  32         chandef->center_freq2 = 0;
  33         chandef->edmg.bw_config = 0;
  34         chandef->edmg.channels = 0;
  35
  36         switch (chan_type) {
  37         case NL80211_CHAN_NO_HT:
  38                 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
  39                 chandef->center_freq1 = chan->center_freq;
  40                 break;
  41         case NL80211_CHAN_HT20:
  42                 chandef->width = NL80211_CHAN_WIDTH_20;
  43                 chandef->center_freq1 = chan->center_freq;
  44                 break;
  45         case NL80211_CHAN_HT40PLUS:
  46                 chandef->width = NL80211_CHAN_WIDTH_40;
  47                 chandef->center_freq1 = chan->center_freq + 10;
  48                 break;
  49         case NL80211_CHAN_HT40MINUS:
  50                 chandef->width = NL80211_CHAN_WIDTH_40;
  51                 chandef->center_freq1 = chan->center_freq - 10;
  52                 break;
  53         default:
  54                 WARN_ON(1);
  55         }
  56 }
  57 EXPORT_SYMBOL(cfg80211_chandef_create);
  58
  59 static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef)
  60 {
  61         int max_contiguous = 0;
  62         int num_of_enabled = 0;
  63         int contiguous = 0;
  64         int i;
  65
  66         if (!chandef->edmg.channels || !chandef->edmg.bw_config)
  67                 return false;
  68
  69         if (!cfg80211_valid_60g_freq(chandef->chan->center_freq))
  70                 return false;
  71
  72         for (i = 0; i < 6; i++) {
  73                 if (chandef->edmg.channels & BIT(i)) {
  74                         contiguous++;
  75                         num_of_enabled++;
  76                 } else {
  77                         contiguous = 0;
  78                 }
  79
  80                 max_contiguous = max(contiguous, max_contiguous);
  81         }
  82         /* basic verification of edmg configuration according to
  83          * IEEE P802.11ay/D4.0 section 9.4.2.251
  84          */
  85         /* check bw_config against contiguous edmg channels */
  86         switch (chandef->edmg.bw_config) {
  87         case IEEE80211_EDMG_BW_CONFIG_4:
  88         case IEEE80211_EDMG_BW_CONFIG_8:
  89         case IEEE80211_EDMG_BW_CONFIG_12:
  90                 if (max_contiguous < 1)
  91                         return false;
  92                 break;
  93         case IEEE80211_EDMG_BW_CONFIG_5:
  94         case IEEE80211_EDMG_BW_CONFIG_9:
  95         case IEEE80211_EDMG_BW_CONFIG_13:
  96                 if (max_contiguous < 2)
  97                         return false;
  98                 break;
  99         case IEEE80211_EDMG_BW_CONFIG_6:
 100         case IEEE80211_EDMG_BW_CONFIG_10:
 101         case IEEE80211_EDMG_BW_CONFIG_14:
 102                 if (max_contiguous < 3)
 103                         return false;
 104                 break;
 105         case IEEE80211_EDMG_BW_CONFIG_7:
 106         case IEEE80211_EDMG_BW_CONFIG_11:
 107         case IEEE80211_EDMG_BW_CONFIG_15:
 108                 if (max_contiguous < 4)
 109                         return false;
 110                 break;
 111
 112         default:
 113                 return false;
 114         }
 115
 116         /* check bw_config against aggregated (non contiguous) edmg channels */
 117         switch (chandef->edmg.bw_config) {
 118         case IEEE80211_EDMG_BW_CONFIG_4:
 119         case IEEE80211_EDMG_BW_CONFIG_5:
 120         case IEEE80211_EDMG_BW_CONFIG_6:
 121         case IEEE80211_EDMG_BW_CONFIG_7:
 122                 break;
 123         case IEEE80211_EDMG_BW_CONFIG_8:
 124         case IEEE80211_EDMG_BW_CONFIG_9:
 125         case IEEE80211_EDMG_BW_CONFIG_10:
 126         case IEEE80211_EDMG_BW_CONFIG_11:
 127                 if (num_of_enabled < 2)
 128                         return false;
 129                 break;
 130         case IEEE80211_EDMG_BW_CONFIG_12:
 131         case IEEE80211_EDMG_BW_CONFIG_13:
 132         case IEEE80211_EDMG_BW_CONFIG_14:
 133         case IEEE80211_EDMG_BW_CONFIG_15:
 134                 if (num_of_enabled < 4 || max_contiguous < 2)
 135                         return false;
 136                 break;
 137         default:
 138                 return false;
 139         }
 140
 141         return true;
 142 }
 143
 144 static int nl80211_chan_width_to_mhz(enum nl80211_chan_width chan_width)
 145 {
 146         int mhz;
 147
 148         switch (chan_width) {
 149         case NL80211_CHAN_WIDTH_1:
 150                 mhz = 1;
 151                 break;
 152         case NL80211_CHAN_WIDTH_2:
 153                 mhz = 2;
 154                 break;
 155         case NL80211_CHAN_WIDTH_4:
 156                 mhz = 4;
 157                 break;
 158         case NL80211_CHAN_WIDTH_8:
 159                 mhz = 8;
 160                 break;
 161         case NL80211_CHAN_WIDTH_16:
 162                 mhz = 16;
 163                 break;
 164         case NL80211_CHAN_WIDTH_5:
 165                 mhz = 5;
 166                 break;
 167         case NL80211_CHAN_WIDTH_10:
 168                 mhz = 10;
 169                 break;
 170         case NL80211_CHAN_WIDTH_20:
 171         case NL80211_CHAN_WIDTH_20_NOHT:
 172                 mhz = 20;
 173                 break;
 174         case NL80211_CHAN_WIDTH_40:
 175                 mhz = 40;
 176                 break;
 177         case NL80211_CHAN_WIDTH_80P80:
 178         case NL80211_CHAN_WIDTH_80:
 179                 mhz = 80;
 180                 break;
 181         case NL80211_CHAN_WIDTH_160:
 182                 mhz = 160;
 183                 break;
 184         case NL80211_CHAN_WIDTH_320:
 185                 mhz = 320;
 186                 break;
 187         default:
 188                 WARN_ON_ONCE(1);
 189                 return -1;
 190         }
 191         return mhz;
 192 }
 193
 194 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
 195 {
 196         return nl80211_chan_width_to_mhz(c->width);
 197 }
 198
 199 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
 200 {
 201         u32 control_freq, oper_freq;
 202         int oper_width, control_width;
 203
 204         if (!chandef->chan)
 205                 return false;
 206
 207         if (chandef->freq1_offset >= 1000)
 208                 return false;
 209
 210         control_freq = chandef->chan->center_freq;
 211
 212         switch (chandef->width) {
 213         case NL80211_CHAN_WIDTH_5:
 214         case NL80211_CHAN_WIDTH_10:
 215         case NL80211_CHAN_WIDTH_20:
 216         case NL80211_CHAN_WIDTH_20_NOHT:
 217                 if (ieee80211_chandef_to_khz(chandef) !=
 218                     ieee80211_channel_to_khz(chandef->chan))
 219                         return false;
 220                 if (chandef->center_freq2)
 221                         return false;
 222                 break;
 223         case NL80211_CHAN_WIDTH_1:
 224         case NL80211_CHAN_WIDTH_2:
 225         case NL80211_CHAN_WIDTH_4:
 226         case NL80211_CHAN_WIDTH_8:
 227         case NL80211_CHAN_WIDTH_16:
 228                 if (chandef->chan->band != NL80211_BAND_S1GHZ)
 229                         return false;
 230
 231                 control_freq = ieee80211_channel_to_khz(chandef->chan);
 232                 oper_freq = ieee80211_chandef_to_khz(chandef);
 233                 control_width = nl80211_chan_width_to_mhz(
 234                                         ieee80211_s1g_channel_width(
 235                                                                 chandef->chan));
 236                 oper_width = cfg80211_chandef_get_width(chandef);
 237
 238                 if (oper_width < 0 || control_width < 0)
 239                         return false;
 240                 if (chandef->center_freq2)
 241                         return false;
 242
 243                 if (control_freq + MHZ_TO_KHZ(control_width) / 2 >
 244                     oper_freq + MHZ_TO_KHZ(oper_width) / 2)
 245                         return false;
 246
 247                 if (control_freq - MHZ_TO_KHZ(control_width) / 2 <
 248                     oper_freq - MHZ_TO_KHZ(oper_width) / 2)
 249                         return false;
 250                 break;
 251         case NL80211_CHAN_WIDTH_80P80:
 252                 if (!chandef->center_freq2)
 253                         return false;
 254                 /* adjacent is not allowed -- that's a 160 MHz channel */
 255                 if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
 256                     chandef->center_freq2 - chandef->center_freq1 == 80)
 257                         return false;
 258                 break;
 259         default:
 260                 if (chandef->center_freq2)
 261                         return false;
 262                 break;
 263         }
 264
 265         switch (chandef->width) {
 266         case NL80211_CHAN_WIDTH_5:
 267         case NL80211_CHAN_WIDTH_10:
 268         case NL80211_CHAN_WIDTH_20:
 269         case NL80211_CHAN_WIDTH_20_NOHT:
 270         case NL80211_CHAN_WIDTH_1:
 271         case NL80211_CHAN_WIDTH_2:
 272         case NL80211_CHAN_WIDTH_4:
 273         case NL80211_CHAN_WIDTH_8:
 274         case NL80211_CHAN_WIDTH_16:
 275                 /* all checked above */
 276                 break;
 277         case NL80211_CHAN_WIDTH_320:
 278                 if (chandef->center_freq1 == control_freq + 150 ||
 279                     chandef->center_freq1 == control_freq + 130 ||
 280                     chandef->center_freq1 == control_freq + 110 ||
 281                     chandef->center_freq1 == control_freq + 90 ||
 282                     chandef->center_freq1 == control_freq - 90 ||
 283                     chandef->center_freq1 == control_freq - 110 ||
 284                     chandef->center_freq1 == control_freq - 130 ||
 285                     chandef->center_freq1 == control_freq - 150)
 286                         break;
 287                 fallthrough;
 288         case NL80211_CHAN_WIDTH_160:
 289                 if (chandef->center_freq1 == control_freq + 70 ||
 290                     chandef->center_freq1 == control_freq + 50 ||
 291                     chandef->center_freq1 == control_freq - 50 ||
 292                     chandef->center_freq1 == control_freq - 70)
 293                         break;
 294                 fallthrough;
 295         case NL80211_CHAN_WIDTH_80P80:
 296         case NL80211_CHAN_WIDTH_80:
 297                 if (chandef->center_freq1 == control_freq + 30 ||
 298                     chandef->center_freq1 == control_freq - 30)
 299                         break;
 300                 fallthrough;
 301         case NL80211_CHAN_WIDTH_40:
 302                 if (chandef->center_freq1 == control_freq + 10 ||
 303                     chandef->center_freq1 == control_freq - 10)
 304                         break;
 305                 fallthrough;
 306         default:
 307                 return false;
 308         }
 309
 310         /* channel 14 is only for IEEE 802.11b */
 311         if (chandef->center_freq1 == 2484 &&
 312             chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
 313                 return false;
 314
 315         if (cfg80211_chandef_is_edmg(chandef) &&
 316             !cfg80211_edmg_chandef_valid(chandef))
 317                 return false;
 318
 319         return true;
 320 }
 321 EXPORT_SYMBOL(cfg80211_chandef_valid);
 322
 323 static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
 324                                   u32 *pri40, u32 *pri80, u32 *pri160)
 325 {
 326         int tmp;
 327
 328         switch (c->width) {
 329         case NL80211_CHAN_WIDTH_40:
 330                 *pri40 = c->center_freq1;
 331                 *pri80 = 0;
 332                 *pri160 = 0;
 333                 break;
 334         case NL80211_CHAN_WIDTH_80:
 335         case NL80211_CHAN_WIDTH_80P80:
 336                 *pri160 = 0;
 337                 *pri80 = c->center_freq1;
 338                 /* n_P20 */
 339                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
 340                 /* n_P40 */
 341                 tmp /= 2;
 342                 /* freq_P40 */
 343                 *pri40 = c->center_freq1 - 20 + 40 * tmp;
 344                 break;
 345         case NL80211_CHAN_WIDTH_160:
 346                 *pri160 = c->center_freq1;
 347                 /* n_P20 */
 348                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
 349                 /* n_P40 */
 350                 tmp /= 2;
 351                 /* freq_P40 */
 352                 *pri40 = c->center_freq1 - 60 + 40 * tmp;
 353                 /* n_P80 */
 354                 tmp /= 2;
 355                 *pri80 = c->center_freq1 - 40 + 80 * tmp;
 356                 break;
 357         case NL80211_CHAN_WIDTH_320:
 358                 /* n_P20 */
 359                 tmp = (150 + c->chan->center_freq - c->center_freq1) / 20;
 360                 /* n_P40 */
 361                 tmp /= 2;
 362                 /* freq_P40 */
 363                 *pri40 = c->center_freq1 - 140 + 40 * tmp;
 364                 /* n_P80 */
 365                 tmp /= 2;
 366                 *pri80 = c->center_freq1 - 120 + 80 * tmp;
 367                 /* n_P160 */
 368                 tmp /= 2;
 369                 *pri160 = c->center_freq1 - 80 + 160 * tmp;
 370                 break;
 371         default:
 372                 WARN_ON_ONCE(1);
 373         }
 374 }
 375
 376 const struct cfg80211_chan_def *
 377 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
 378                             const struct cfg80211_chan_def *c2)
 379 {
 380         u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80, c1_pri160, c2_pri160;
 381
 382         /* If they are identical, return */
 383         if (cfg80211_chandef_identical(c1, c2))
 384                 return c1;
 385
 386         /* otherwise, must have same control channel */
 387         if (c1->chan != c2->chan)
 388                 return NULL;
 389
 390         /*
 391          * If they have the same width, but aren't identical,
 392          * then they can't be compatible.
 393          */
 394         if (c1->width == c2->width)
 395                 return NULL;
 396
 397         /*
 398          * can't be compatible if one of them is 5 or 10 MHz,
 399          * but they don't have the same width.
 400          */
 401         if (c1->width == NL80211_CHAN_WIDTH_5 ||
 402             c1->width == NL80211_CHAN_WIDTH_10 ||
 403             c2->width == NL80211_CHAN_WIDTH_5 ||
 404             c2->width == NL80211_CHAN_WIDTH_10)
 405                 return NULL;
 406
 407         if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
 408             c1->width == NL80211_CHAN_WIDTH_20)
 409                 return c2;
 410
 411         if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
 412             c2->width == NL80211_CHAN_WIDTH_20)
 413                 return c1;
 414
 415         chandef_primary_freqs(c1, &c1_pri40, &c1_pri80, &c1_pri160);
 416         chandef_primary_freqs(c2, &c2_pri40, &c2_pri80, &c2_pri160);
 417
 418         if (c1_pri40 != c2_pri40)
 419                 return NULL;
 420
 421         if (c1->width == NL80211_CHAN_WIDTH_40)
 422                 return c2;
 423
 424         if (c2->width == NL80211_CHAN_WIDTH_40)
 425                 return c1;
 426
 427         if (c1_pri80 != c2_pri80)
 428                 return NULL;
 429
 430         if (c1->width == NL80211_CHAN_WIDTH_80 &&
 431             c2->width > NL80211_CHAN_WIDTH_80)
 432                 return c2;
 433
 434         if (c2->width == NL80211_CHAN_WIDTH_80 &&
 435             c1->width > NL80211_CHAN_WIDTH_80)
 436                 return c1;
 437
 438         WARN_ON(!c1_pri160 && !c2_pri160);
 439         if (c1_pri160 && c2_pri160 && c1_pri160 != c2_pri160)
 440                 return NULL;
 441
 442         if (c1->width > c2->width)
 443                 return c1;
 444         return c2;
 445 }
 446 EXPORT_SYMBOL(cfg80211_chandef_compatible);
 447
 448 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
 449                                          u32 bandwidth,
 450                                          enum nl80211_dfs_state dfs_state)
 451 {
 452         struct ieee80211_channel *c;
 453         u32 freq;
 454
 455         for (freq = center_freq - bandwidth/2 + 10;
 456              freq <= center_freq + bandwidth/2 - 10;
 457              freq += 20) {
 458                 c = ieee80211_get_channel(wiphy, freq);
 459                 if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
 460                         continue;
 461
 462                 c->dfs_state = dfs_state;
 463                 c->dfs_state_entered = jiffies;
 464         }
 465 }
 466
 467 void cfg80211_set_dfs_state(struct wiphy *wiphy,
 468                             const struct cfg80211_chan_def *chandef,
 469                             enum nl80211_dfs_state dfs_state)
 470 {
 471         int width;
 472
 473         if (WARN_ON(!cfg80211_chandef_valid(chandef)))
 474                 return;
 475
 476         width = cfg80211_chandef_get_width(chandef);
 477         if (width < 0)
 478                 return;
 479
 480         cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
 481                                      width, dfs_state);
 482
 483         if (!chandef->center_freq2)
 484                 return;
 485         cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
 486                                      width, dfs_state);
 487 }
 488
 489 static u32 cfg80211_get_start_freq(u32 center_freq,
 490                                    u32 bandwidth)
 491 {
 492         u32 start_freq;
 493
 494         bandwidth = MHZ_TO_KHZ(bandwidth);
 495         if (bandwidth <= MHZ_TO_KHZ(20))
 496                 start_freq = center_freq;
 497         else
 498                 start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10);
 499
 500         return start_freq;
 501 }
 502
 503 static u32 cfg80211_get_end_freq(u32 center_freq,
 504                                  u32 bandwidth)
 505 {
 506         u32 end_freq;
 507
 508         bandwidth = MHZ_TO_KHZ(bandwidth);
 509         if (bandwidth <= MHZ_TO_KHZ(20))
 510                 end_freq = center_freq;
 511         else
 512                 end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10);
 513
 514         return end_freq;
 515 }
 516
 517 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
 518                                             u32 center_freq,
 519                                             u32 bandwidth)
 520 {
 521         struct ieee80211_channel *c;
 522         u32 freq, start_freq, end_freq;
 523
 524         start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
 525         end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
 526
 527         for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
 528                 c = ieee80211_get_channel_khz(wiphy, freq);
 529                 if (!c)
 530                         return -EINVAL;
 531
 532                 if (c->flags & IEEE80211_CHAN_RADAR)
 533                         return 1;
 534         }
 535         return 0;
 536 }
 537
 538
 539 int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
 540                                   const struct cfg80211_chan_def *chandef,
 541                                   enum nl80211_iftype iftype)
 542 {
 543         int width;
 544         int ret;
 545
 546         if (WARN_ON(!cfg80211_chandef_valid(chandef)))
 547                 return -EINVAL;
 548
 549         switch (iftype) {
 550         case NL80211_IFTYPE_ADHOC:
 551         case NL80211_IFTYPE_AP:
 552         case NL80211_IFTYPE_P2P_GO:
 553         case NL80211_IFTYPE_MESH_POINT:
 554                 width = cfg80211_chandef_get_width(chandef);
 555                 if (width < 0)
 556                         return -EINVAL;
 557
 558                 ret = cfg80211_get_chans_dfs_required(wiphy,
 559                                         ieee80211_chandef_to_khz(chandef),
 560                                         width);
 561                 if (ret < 0)
 562                         return ret;
 563                 else if (ret > 0)
 564                         return BIT(chandef->width);
 565
 566                 if (!chandef->center_freq2)
 567                         return 0;
 568
 569                 ret = cfg80211_get_chans_dfs_required(wiphy,
 570                                         MHZ_TO_KHZ(chandef->center_freq2),
 571                                         width);
 572                 if (ret < 0)
 573                         return ret;
 574                 else if (ret > 0)
 575                         return BIT(chandef->width);
 576
 577                 break;
 578         case NL80211_IFTYPE_STATION:
 579         case NL80211_IFTYPE_OCB:
 580         case NL80211_IFTYPE_P2P_CLIENT:
 581         case NL80211_IFTYPE_MONITOR:
 582         case NL80211_IFTYPE_AP_VLAN:
 583         case NL80211_IFTYPE_P2P_DEVICE:
 584         case NL80211_IFTYPE_NAN:
 585                 break;
 586         case NL80211_IFTYPE_WDS:
 587         case NL80211_IFTYPE_UNSPECIFIED:
 588         case NUM_NL80211_IFTYPES:
 589                 WARN_ON(1);
 590         }
 591
 592         return 0;
 593 }
 594 EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
 595
 596 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
 597                                          u32 center_freq,
 598                                          u32 bandwidth)
 599 {
 600         struct ieee80211_channel *c;
 601         u32 freq, start_freq, end_freq;
 602         int count = 0;
 603
 604         start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
 605         end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
 606
 607         /*
 608          * Check entire range of channels for the bandwidth.
 609          * Check all channels are DFS channels (DFS_USABLE or
 610          * DFS_AVAILABLE). Return number of usable channels
 611          * (require CAC). Allow DFS and non-DFS channel mix.
 612          */
 613         for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
 614                 c = ieee80211_get_channel_khz(wiphy, freq);
 615                 if (!c)
 616                         return -EINVAL;
 617
 618                 if (c->flags & IEEE80211_CHAN_DISABLED)
 619                         return -EINVAL;
 620
 621                 if (c->flags & IEEE80211_CHAN_RADAR) {
 622                         if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
 623                                 return -EINVAL;
 624
 625                         if (c->dfs_state == NL80211_DFS_USABLE)
 626                                 count++;
 627                 }
 628         }
 629
 630         return count;
 631 }
 632
 633 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
 634                                  const struct cfg80211_chan_def *chandef)
 635 {
 636         int width;
 637         int r1, r2 = 0;
 638
 639         if (WARN_ON(!cfg80211_chandef_valid(chandef)))
 640                 return false;
 641
 642         width = cfg80211_chandef_get_width(chandef);
 643         if (width < 0)
 644                 return false;
 645
 646         r1 = cfg80211_get_chans_dfs_usable(wiphy,
 647                                            MHZ_TO_KHZ(chandef->center_freq1),
 648                                            width);
 649
 650         if (r1 < 0)
 651                 return false;
 652
 653         switch (chandef->width) {
 654         case NL80211_CHAN_WIDTH_80P80:
 655                 WARN_ON(!chandef->center_freq2);
 656                 r2 = cfg80211_get_chans_dfs_usable(wiphy,
 657                                         MHZ_TO_KHZ(chandef->center_freq2),
 658                                         width);
 659                 if (r2 < 0)
 660                         return false;
 661                 break;
 662         default:
 663                 WARN_ON(chandef->center_freq2);
 664                 break;
 665         }
 666
 667         return (r1 + r2 > 0);
 668 }
 669
 670 /*
 671  * Checks if center frequency of chan falls with in the bandwidth
 672  * range of chandef.
 673  */
 674 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
 675                           struct ieee80211_channel *chan,
 676                           bool primary_only)
 677 {
 678         int width;
 679         u32 freq;
 680
 681         if (!chandef->chan)
 682                 return false;
 683
 684         if (chandef->chan->center_freq == chan->center_freq)
 685                 return true;
 686
 687         if (primary_only)
 688                 return false;
 689
 690         width = cfg80211_chandef_get_width(chandef);
 691         if (width <= 20)
 692                 return false;
 693
 694         for (freq = chandef->center_freq1 - width / 2 + 10;
 695              freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
 696                 if (chan->center_freq == freq)
 697                         return true;
 698         }
 699
 700         if (!chandef->center_freq2)
 701                 return false;
 702
 703         for (freq = chandef->center_freq2 - width / 2 + 10;
 704              freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
 705                 if (chan->center_freq == freq)
 706                         return true;
 707         }
 708
 709         return false;
 710 }
 711
 712 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
 713 {
 714         unsigned int link;
 715
 716         ASSERT_WDEV_LOCK(wdev);
 717
 718         switch (wdev->iftype) {
 719         case NL80211_IFTYPE_AP:
 720         case NL80211_IFTYPE_P2P_GO:
 721                 for_each_valid_link(wdev, link) {
 722                         if (wdev->links[link].ap.beacon_interval)
 723                                 return true;
 724                 }
 725                 break;
 726         case NL80211_IFTYPE_ADHOC:
 727                 if (wdev->u.ibss.ssid_len)
 728                         return true;
 729                 break;
 730         case NL80211_IFTYPE_MESH_POINT:
 731                 if (wdev->u.mesh.id_len)
 732                         return true;
 733                 break;
 734         case NL80211_IFTYPE_STATION:
 735         case NL80211_IFTYPE_OCB:
 736         case NL80211_IFTYPE_P2P_CLIENT:
 737         case NL80211_IFTYPE_MONITOR:
 738         case NL80211_IFTYPE_AP_VLAN:
 739         case NL80211_IFTYPE_P2P_DEVICE:
 740         /* Can NAN type be considered as beaconing interface? */
 741         case NL80211_IFTYPE_NAN:
 742                 break;
 743         case NL80211_IFTYPE_UNSPECIFIED:
 744         case NL80211_IFTYPE_WDS:
 745         case NUM_NL80211_IFTYPES:
 746                 WARN_ON(1);
 747         }
 748
 749         return false;
 750 }
 751
 752 bool cfg80211_wdev_on_sub_chan(struct wireless_dev *wdev,
 753                                struct ieee80211_channel *chan,
 754                                bool primary_only)
 755 {
 756         unsigned int link;
 757
 758         switch (wdev->iftype) {
 759         case NL80211_IFTYPE_AP:
 760         case NL80211_IFTYPE_P2P_GO:
 761                 for_each_valid_link(wdev, link) {
 762                         if (cfg80211_is_sub_chan(&wdev->links[link].ap.chandef,
 763                                                  chan, primary_only))
 764                                 return true;
 765                 }
 766                 break;
 767         case NL80211_IFTYPE_ADHOC:
 768                 return cfg80211_is_sub_chan(&wdev->u.ibss.chandef, chan,
 769                                             primary_only);
 770         case NL80211_IFTYPE_MESH_POINT:
 771                 return cfg80211_is_sub_chan(&wdev->u.mesh.chandef, chan,
 772                                             primary_only);
 773         default:
 774                 break;
 775         }
 776
 777         return false;
 778 }
 779
 780 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
 781                                         struct ieee80211_channel *chan)
 782 {
 783         struct wireless_dev *wdev;
 784
 785         list_for_each_entry(wdev, &wiphy->wdev_list, list) {
 786                 wdev_lock(wdev);
 787                 if (!cfg80211_beaconing_iface_active(wdev)) {
 788                         wdev_unlock(wdev);
 789                         continue;
 790                 }
 791
 792                 if (cfg80211_wdev_on_sub_chan(wdev, chan, false)) {
 793                         wdev_unlock(wdev);
 794                         return true;
 795                 }
 796                 wdev_unlock(wdev);
 797         }
 798
 799         return false;
 800 }
 801
 802 static bool
 803 cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev,
 804                                  struct ieee80211_channel *channel)
 805 {
 806         if (!rdev->background_radar_wdev)
 807                 return false;
 808
 809         if (!cfg80211_chandef_valid(&rdev->background_radar_chandef))
 810                 return false;
 811
 812         return cfg80211_is_sub_chan(&rdev->background_radar_chandef, channel,
 813                                     false);
 814 }
 815
 816 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
 817                                   struct ieee80211_channel *chan)
 818 {
 819         struct cfg80211_registered_device *rdev;
 820
 821         ASSERT_RTNL();
 822
 823         if (!(chan->flags & IEEE80211_CHAN_RADAR))
 824                 return false;
 825
 826         list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
 827                 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
 828                         continue;
 829
 830                 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
 831                         return true;
 832
 833                 if (cfg80211_offchan_chain_is_active(rdev, chan))
 834                         return true;
 835         }
 836
 837         return false;
 838 }
 839
 840 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
 841                                              u32 center_freq,
 842                                              u32 bandwidth)
 843 {
 844         struct ieee80211_channel *c;
 845         u32 freq, start_freq, end_freq;
 846         bool dfs_offload;
 847
 848         dfs_offload = wiphy_ext_feature_isset(wiphy,
 849                                               NL80211_EXT_FEATURE_DFS_OFFLOAD);
 850
 851         start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
 852         end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
 853
 854         /*
 855          * Check entire range of channels for the bandwidth.
 856          * If any channel in between is disabled or has not
 857          * had gone through CAC return false
 858          */
 859         for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
 860                 c = ieee80211_get_channel_khz(wiphy, freq);
 861                 if (!c)
 862                         return false;
 863
 864                 if (c->flags & IEEE80211_CHAN_DISABLED)
 865                         return false;
 866
 867                 if ((c->flags & IEEE80211_CHAN_RADAR) &&
 868                     (c->dfs_state != NL80211_DFS_AVAILABLE) &&
 869                     !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload))
 870                         return false;
 871         }
 872
 873         return true;
 874 }
 875
 876 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
 877                                 const struct cfg80211_chan_def *chandef)
 878 {
 879         int width;
 880         int r;
 881
 882         if (WARN_ON(!cfg80211_chandef_valid(chandef)))
 883                 return false;
 884
 885         width = cfg80211_chandef_get_width(chandef);
 886         if (width < 0)
 887                 return false;
 888
 889         r = cfg80211_get_chans_dfs_available(wiphy,
 890                                              MHZ_TO_KHZ(chandef->center_freq1),
 891                                              width);
 892
 893         /* If any of channels unavailable for cf1 just return */
 894         if (!r)
 895                 return r;
 896
 897         switch (chandef->width) {
 898         case NL80211_CHAN_WIDTH_80P80:
 899                 WARN_ON(!chandef->center_freq2);
 900                 r = cfg80211_get_chans_dfs_available(wiphy,
 901                                         MHZ_TO_KHZ(chandef->center_freq2),
 902                                         width);
 903                 break;
 904         default:
 905                 WARN_ON(chandef->center_freq2);
 906                 break;
 907         }
 908
 909         return r;
 910 }
 911
 912 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
 913                                                     u32 center_freq,
 914                                                     u32 bandwidth)
 915 {
 916         struct ieee80211_channel *c;
 917         u32 start_freq, end_freq, freq;
 918         unsigned int dfs_cac_ms = 0;
 919
 920         start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
 921         end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
 922
 923         for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
 924                 c = ieee80211_get_channel_khz(wiphy, freq);
 925                 if (!c)
 926                         return 0;
 927
 928                 if (c->flags & IEEE80211_CHAN_DISABLED)
 929                         return 0;
 930
 931                 if (!(c->flags & IEEE80211_CHAN_RADAR))
 932                         continue;
 933
 934                 if (c->dfs_cac_ms > dfs_cac_ms)
 935                         dfs_cac_ms = c->dfs_cac_ms;
 936         }
 937
 938         return dfs_cac_ms;
 939 }
 940
 941 unsigned int
 942 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
 943                               const struct cfg80211_chan_def *chandef)
 944 {
 945         int width;
 946         unsigned int t1 = 0, t2 = 0;
 947
 948         if (WARN_ON(!cfg80211_chandef_valid(chandef)))
 949                 return 0;
 950
 951         width = cfg80211_chandef_get_width(chandef);
 952         if (width < 0)
 953                 return 0;
 954
 955         t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
 956                                              MHZ_TO_KHZ(chandef->center_freq1),
 957                                              width);
 958
 959         if (!chandef->center_freq2)
 960                 return t1;
 961
 962         t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
 963                                              MHZ_TO_KHZ(chandef->center_freq2),
 964                                              width);
 965
 966         return max(t1, t2);
 967 }
 968
 969 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
 970                                         u32 center_freq, u32 bandwidth,
 971                                         u32 prohibited_flags)
 972 {
 973         struct ieee80211_channel *c;
 974         u32 freq, start_freq, end_freq;
 975
 976         start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
 977         end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
 978
 979         for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) {
 980                 c = ieee80211_get_channel_khz(wiphy, freq);
 981                 if (!c || c->flags & prohibited_flags)
 982                         return false;
 983         }
 984
 985         return true;
 986 }
 987
 988 /* check if the operating channels are valid and supported */
 989 static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels,
 990                                  enum ieee80211_edmg_bw_config edmg_bw_config,
 991                                  int primary_channel,
 992                                  struct ieee80211_edmg *edmg_cap)
 993 {
 994         struct ieee80211_channel *chan;
 995         int i, freq;
 996         int channels_counter = 0;
 997
 998         if (!edmg_channels && !edmg_bw_config)
 999                 return true;
1000
1001         if ((!edmg_channels && edmg_bw_config) ||
1002             (edmg_channels && !edmg_bw_config))
1003                 return false;
1004
1005         if (!(edmg_channels & BIT(primary_channel - 1)))
1006                 return false;
1007
1008         /* 60GHz channels 1..6 */
1009         for (i = 0; i < 6; i++) {
1010                 if (!(edmg_channels & BIT(i)))
1011                         continue;
1012
1013                 if (!(edmg_cap->channels & BIT(i)))
1014                         return false;
1015
1016                 channels_counter++;
1017
1018                 freq = ieee80211_channel_to_frequency(i + 1,
1019                                                       NL80211_BAND_60GHZ);
1020                 chan = ieee80211_get_channel(wiphy, freq);
1021                 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
1022                         return false;
1023         }
1024
1025         /* IEEE802.11 allows max 4 channels */
1026         if (channels_counter > 4)
1027                 return false;
1028
1029         /* check bw_config is a subset of what driver supports
1030          * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13)
1031          */
1032         if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4))
1033                 return false;
1034
1035         if (edmg_bw_config > edmg_cap->bw_config)
1036                 return false;
1037
1038         return true;
1039 }
1040
1041 bool cfg80211_chandef_usable(struct wiphy *wiphy,
1042                              const struct cfg80211_chan_def *chandef,
1043                              u32 prohibited_flags)
1044 {
1045         struct ieee80211_sta_ht_cap *ht_cap;
1046         struct ieee80211_sta_vht_cap *vht_cap;
1047         struct ieee80211_edmg *edmg_cap;
1048         u32 width, control_freq, cap;
1049         bool ext_nss_cap, support_80_80 = false, support_320 = false;
1050         const struct ieee80211_sband_iftype_data *iftd;
1051         struct ieee80211_supported_band *sband;
1052         int i;
1053
1054         if (WARN_ON(!cfg80211_chandef_valid(chandef)))
1055                 return false;
1056
1057         ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
1058         vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
1059         edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap;
1060         ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) &
1061                         IEEE80211_VHT_EXT_NSS_BW_CAPABLE;
1062
1063         if (edmg_cap->channels &&
1064             !cfg80211_edmg_usable(wiphy,
1065                                   chandef->edmg.channels,
1066                                   chandef->edmg.bw_config,
1067                                   chandef->chan->hw_value,
1068                                   edmg_cap))
1069                 return false;
1070
1071         control_freq = chandef->chan->center_freq;
1072
1073         switch (chandef->width) {
1074         case NL80211_CHAN_WIDTH_1:
1075                 width = 1;
1076                 break;
1077         case NL80211_CHAN_WIDTH_2:
1078                 width = 2;
1079                 break;
1080         case NL80211_CHAN_WIDTH_4:
1081                 width = 4;
1082                 break;
1083         case NL80211_CHAN_WIDTH_8:
1084                 width = 8;
1085                 break;
1086         case NL80211_CHAN_WIDTH_16:
1087                 width = 16;
1088                 break;
1089         case NL80211_CHAN_WIDTH_5:
1090                 width = 5;
1091                 break;
1092         case NL80211_CHAN_WIDTH_10:
1093                 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
1094                 width = 10;
1095                 break;
1096         case NL80211_CHAN_WIDTH_20:
1097                 if (!ht_cap->ht_supported &&
1098                     chandef->chan->band != NL80211_BAND_6GHZ)
1099                         return false;
1100                 fallthrough;
1101         case NL80211_CHAN_WIDTH_20_NOHT:
1102                 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
1103                 width = 20;
1104                 break;
1105         case NL80211_CHAN_WIDTH_40:
1106                 width = 40;
1107                 if (chandef->chan->band == NL80211_BAND_6GHZ)
1108                         break;
1109                 if (!ht_cap->ht_supported)
1110                         return false;
1111                 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
1112                     ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
1113                         return false;
1114                 if (chandef->center_freq1 < control_freq &&
1115                     chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
1116                         return false;
1117                 if (chandef->center_freq1 > control_freq &&
1118                     chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
1119                         return false;
1120                 break;
1121         case NL80211_CHAN_WIDTH_80P80:
1122                 cap = vht_cap->cap;
1123                 support_80_80 =
1124                         (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
1125                         (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1126                          cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
1127                         (ext_nss_cap &&
1128                          u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1);
1129                 if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80)
1130                         return false;
1131                 fallthrough;
1132         case NL80211_CHAN_WIDTH_80:
1133                 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
1134                 width = 80;
1135                 if (chandef->chan->band == NL80211_BAND_6GHZ)
1136                         break;
1137                 if (!vht_cap->vht_supported)
1138                         return false;
1139                 break;
1140         case NL80211_CHAN_WIDTH_160:
1141                 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
1142                 width = 160;
1143                 if (chandef->chan->band == NL80211_BAND_6GHZ)
1144                         break;
1145                 if (!vht_cap->vht_supported)
1146                         return false;
1147                 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
1148                 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
1149                     cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
1150                     !(ext_nss_cap &&
1151                       (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)))
1152                         return false;
1153                 break;
1154         case NL80211_CHAN_WIDTH_320:
1155                 prohibited_flags |= IEEE80211_CHAN_NO_320MHZ;
1156                 width = 320;
1157
1158                 if (chandef->chan->band != NL80211_BAND_6GHZ)
1159                         return false;
1160
1161                 sband = wiphy->bands[NL80211_BAND_6GHZ];
1162                 if (!sband)
1163                         return false;
1164
1165                 for (i = 0; i < sband->n_iftype_data; i++) {
1166                         iftd = &sband->iftype_data[i];
1167                         if (!iftd->eht_cap.has_eht)
1168                                 continue;
1169
1170                         if (iftd->eht_cap.eht_cap_elem.phy_cap_info[0] &
1171                             IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) {
1172                                 support_320 = true;
1173                                 break;
1174                         }
1175                 }
1176
1177                 if (!support_320)
1178                         return false;
1179                 break;
1180         default:
1181                 WARN_ON_ONCE(1);
1182                 return false;
1183         }
1184
1185         /*
1186          * TODO: What if there are only certain 80/160/80+80 MHz channels
1187          *       allowed by the driver, or only certain combinations?
1188          *       For 40 MHz the driver can set the NO_HT40 flags, but for
1189          *       80/160 MHz and in particular 80+80 MHz this isn't really
1190          *       feasible and we only have NO_80MHZ/NO_160MHZ so far but
1191          *       no way to cover 80+80 MHz or more complex restrictions.
1192          *       Note that such restrictions also need to be advertised to
1193          *       userspace, for example for P2P channel selection.
1194          */
1195
1196         if (width > 20)
1197                 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1198
1199         /* 5 and 10 MHz are only defined for the OFDM PHY */
1200         if (width < 20)
1201                 prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
1202
1203
1204         if (!cfg80211_secondary_chans_ok(wiphy,
1205                                          ieee80211_chandef_to_khz(chandef),
1206                                          width, prohibited_flags))
1207                 return false;
1208
1209         if (!chandef->center_freq2)
1210                 return true;
1211         return cfg80211_secondary_chans_ok(wiphy,
1212                                            MHZ_TO_KHZ(chandef->center_freq2),
1213                                            width, prohibited_flags);
1214 }
1215 EXPORT_SYMBOL(cfg80211_chandef_usable);
1216
1217 static bool cfg80211_ir_permissive_check_wdev(enum nl80211_iftype iftype,
1218                                               struct wireless_dev *wdev,
1219                                               struct ieee80211_channel *chan)
1220 {
1221         struct ieee80211_channel *other_chan = NULL;
1222         unsigned int link_id;
1223         int r1, r2;
1224
1225         for_each_valid_link(wdev, link_id) {
1226                 if (wdev->iftype == NL80211_IFTYPE_STATION &&
1227                     wdev->links[link_id].client.current_bss)
1228                         other_chan = wdev->links[link_id].client.current_bss->pub.channel;
1229
1230                 /*
1231                  * If a GO already operates on the same GO_CONCURRENT channel,
1232                  * this one (maybe the same one) can beacon as well. We allow
1233                  * the operation even if the station we relied on with
1234                  * GO_CONCURRENT is disconnected now. But then we must make sure
1235                  * we're not outdoor on an indoor-only channel.
1236                  */
1237                 if (iftype == NL80211_IFTYPE_P2P_GO &&
1238                     wdev->iftype == NL80211_IFTYPE_P2P_GO &&
1239                     wdev->links[link_id].ap.beacon_interval &&
1240                     !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1241                         other_chan = wdev->links[link_id].ap.chandef.chan;
1242
1243                 if (!other_chan)
1244                         continue;
1245
1246                 if (chan == other_chan)
1247                         return true;
1248
1249                 if (chan->band != NL80211_BAND_5GHZ &&
1250                     chan->band != NL80211_BAND_6GHZ)
1251                         continue;
1252
1253                 r1 = cfg80211_get_unii(chan->center_freq);
1254                 r2 = cfg80211_get_unii(other_chan->center_freq);
1255
1256                 if (r1 != -EINVAL && r1 == r2) {
1257                         /*
1258                          * At some locations channels 149-165 are considered a
1259                          * bundle, but at other locations, e.g., Indonesia,
1260                          * channels 149-161 are considered a bundle while
1261                          * channel 165 is left out and considered to be in a
1262                          * different bundle. Thus, in case that there is a
1263                          * station interface connected to an AP on channel 165,
1264                          * it is assumed that channels 149-161 are allowed for
1265                          * GO operations. However, having a station interface
1266                          * connected to an AP on channels 149-161, does not
1267                          * allow GO operation on channel 165.
1268                          */
1269                         if (chan->center_freq == 5825 &&
1270                             other_chan->center_freq != 5825)
1271                                 continue;
1272                         return true;
1273                 }
1274         }
1275
1276         return false;
1277 }
1278
1279 /*
1280  * Check if the channel can be used under permissive conditions mandated by
1281  * some regulatory bodies, i.e., the channel is marked with
1282  * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
1283  * associated to an AP on the same channel or on the same UNII band
1284  * (assuming that the AP is an authorized master).
1285  * In addition allow operation on a channel on which indoor operation is
1286  * allowed, iff we are currently operating in an indoor environment.
1287  */
1288 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
1289                                         enum nl80211_iftype iftype,
1290                                         struct ieee80211_channel *chan)
1291 {
1292         struct wireless_dev *wdev;
1293         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1294
1295         lockdep_assert_held(&rdev->wiphy.mtx);
1296
1297         if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
1298             !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
1299                 return false;
1300
1301         /* only valid for GO and TDLS off-channel (station/p2p-CL) */
1302         if (iftype != NL80211_IFTYPE_P2P_GO &&
1303             iftype != NL80211_IFTYPE_STATION &&
1304             iftype != NL80211_IFTYPE_P2P_CLIENT)
1305                 return false;
1306
1307         if (regulatory_indoor_allowed() &&
1308             (chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
1309                 return true;
1310
1311         if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
1312                 return false;
1313
1314         /*
1315          * Generally, it is possible to rely on another device/driver to allow
1316          * the IR concurrent relaxation, however, since the device can further
1317          * enforce the relaxation (by doing a similar verifications as this),
1318          * and thus fail the GO instantiation, consider only the interfaces of
1319          * the current registered device.
1320          */
1321         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
1322                 bool ret;
1323
1324                 wdev_lock(wdev);
1325                 ret = cfg80211_ir_permissive_check_wdev(iftype, wdev, chan);
1326                 wdev_unlock(wdev);
1327
1328                 if (ret)
1329                         return ret;
1330         }
1331
1332         return false;
1333 }
1334
1335 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
1336                                      struct cfg80211_chan_def *chandef,
1337                                      enum nl80211_iftype iftype,
1338                                      bool check_no_ir)
1339 {
1340         bool res;
1341         u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
1342                                IEEE80211_CHAN_RADAR;
1343
1344         trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1345
1346         if (check_no_ir)
1347                 prohibited_flags |= IEEE80211_CHAN_NO_IR;
1348
1349         if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
1350             cfg80211_chandef_dfs_available(wiphy, chandef)) {
1351                 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
1352                 prohibited_flags = IEEE80211_CHAN_DISABLED;
1353         }
1354
1355         res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
1356
1357         trace_cfg80211_return_bool(res);
1358         return res;
1359 }
1360
1361 bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
1362                              struct cfg80211_chan_def *chandef,
1363                              enum nl80211_iftype iftype)
1364 {
1365         return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
1366 }
1367 EXPORT_SYMBOL(cfg80211_reg_can_beacon);
1368
1369 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
1370                                    struct cfg80211_chan_def *chandef,
1371                                    enum nl80211_iftype iftype)
1372 {
1373         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1374         bool check_no_ir;
1375
1376         lockdep_assert_held(&rdev->wiphy.mtx);
1377
1378         /*
1379          * Under certain conditions suggested by some regulatory bodies a
1380          * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
1381          * only if such relaxations are not enabled and the conditions are not
1382          * met.
1383          */
1384         check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
1385                                                    chandef->chan);
1386
1387         return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
1388 }
1389 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
1390
1391 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
1392                                  struct cfg80211_chan_def *chandef)
1393 {
1394         if (!rdev->ops->set_monitor_channel)
1395                 return -EOPNOTSUPP;
1396         if (!cfg80211_has_monitors_only(rdev))
1397                 return -EBUSY;
1398
1399         return rdev_set_monitor_channel(rdev, chandef);
1400 }
1401
1402 bool cfg80211_any_usable_channels(struct wiphy *wiphy,
1403                                   unsigned long sband_mask,
1404                                   u32 prohibited_flags)
1405 {
1406         int idx;
1407
1408         prohibited_flags |= IEEE80211_CHAN_DISABLED;
1409
1410         for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) {
1411                 struct ieee80211_supported_band *sband = wiphy->bands[idx];
1412                 int chanidx;
1413
1414                 if (!sband)
1415                         continue;
1416
1417                 for (chanidx = 0; chanidx < sband->n_channels; chanidx++) {
1418                         struct ieee80211_channel *chan;
1419
1420                         chan = &sband->channels[chanidx];
1421
1422                         if (chan->flags & prohibited_flags)
1423                                 continue;
1424
1425                         return true;
1426                 }
1427         }
1428
1429         return false;
1430 }
1431 EXPORT_SYMBOL(cfg80211_any_usable_channels);
1432
1433 struct cfg80211_chan_def *wdev_chandef(struct wireless_dev *wdev,
1434                                        unsigned int link_id)
1435 {
1436         /*
1437          * We need to sort out the locking here - in some cases
1438          * where we get here we really just don't care (yet)
1439          * about the valid links, but in others we do. But we
1440          * get here with various driver cases, so we cannot
1441          * easily require the wdev mutex.
1442          */
1443         if (link_id || wdev->valid_links & BIT(0)) {
1444                 ASSERT_WDEV_LOCK(wdev);
1445                 WARN_ON(!(wdev->valid_links & BIT(link_id)));
1446         }
1447
1448         switch (wdev->iftype) {
1449         case NL80211_IFTYPE_MESH_POINT:
1450                 return &wdev->u.mesh.chandef;
1451         case NL80211_IFTYPE_ADHOC:
1452                 return &wdev->u.ibss.chandef;
1453         case NL80211_IFTYPE_OCB:
1454                 return &wdev->u.ocb.chandef;
1455         case NL80211_IFTYPE_AP:
1456         case NL80211_IFTYPE_P2P_GO:
1457                 return &wdev->links[link_id].ap.chandef;
1458         default:
1459                 return NULL;
1460         }
1461 }
1462 EXPORT_SYMBOL(wdev_chandef);