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 Intel Corporation 10 */ 11 12 #include <linux/export.h> 13 #include <net/cfg80211.h> 14 #include "core.h" 15 #include "rdev-ops.h" 16 17 static bool cfg80211_valid_60g_freq(u32 freq) 18 { 19 return freq >= 58320 && freq <= 70200; 20 } 21 22 void cfg80211_chandef_create(struct cfg80211_chan_def *chandef, 23 struct ieee80211_channel *chan, 24 enum nl80211_channel_type chan_type) 25 { 26 if (WARN_ON(!chan)) 27 return; 28 29 chandef->chan = chan; 30 chandef->center_freq2 = 0; 31 chandef->edmg.bw_config = 0; 32 chandef->edmg.channels = 0; 33 34 switch (chan_type) { 35 case NL80211_CHAN_NO_HT: 36 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 37 chandef->center_freq1 = chan->center_freq; 38 break; 39 case NL80211_CHAN_HT20: 40 chandef->width = NL80211_CHAN_WIDTH_20; 41 chandef->center_freq1 = chan->center_freq; 42 break; 43 case NL80211_CHAN_HT40PLUS: 44 chandef->width = NL80211_CHAN_WIDTH_40; 45 chandef->center_freq1 = chan->center_freq + 10; 46 break; 47 case NL80211_CHAN_HT40MINUS: 48 chandef->width = NL80211_CHAN_WIDTH_40; 49 chandef->center_freq1 = chan->center_freq - 10; 50 break; 51 default: 52 WARN_ON(1); 53 } 54 } 55 EXPORT_SYMBOL(cfg80211_chandef_create); 56 57 static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef) 58 { 59 int max_contiguous = 0; 60 int num_of_enabled = 0; 61 int contiguous = 0; 62 int i; 63 64 if (!chandef->edmg.channels || !chandef->edmg.bw_config) 65 return false; 66 67 if (!cfg80211_valid_60g_freq(chandef->chan->center_freq)) 68 return false; 69 70 for (i = 0; i < 6; i++) { 71 if (chandef->edmg.channels & BIT(i)) { 72 contiguous++; 73 num_of_enabled++; 74 } else { 75 contiguous = 0; 76 } 77 78 max_contiguous = max(contiguous, max_contiguous); 79 } 80 /* basic verification of edmg configuration according to 81 * IEEE P802.11ay/D4.0 section 9.4.2.251 82 */ 83 /* check bw_config against contiguous edmg channels */ 84 switch (chandef->edmg.bw_config) { 85 case IEEE80211_EDMG_BW_CONFIG_4: 86 case IEEE80211_EDMG_BW_CONFIG_8: 87 case IEEE80211_EDMG_BW_CONFIG_12: 88 if (max_contiguous < 1) 89 return false; 90 break; 91 case IEEE80211_EDMG_BW_CONFIG_5: 92 case IEEE80211_EDMG_BW_CONFIG_9: 93 case IEEE80211_EDMG_BW_CONFIG_13: 94 if (max_contiguous < 2) 95 return false; 96 break; 97 case IEEE80211_EDMG_BW_CONFIG_6: 98 case IEEE80211_EDMG_BW_CONFIG_10: 99 case IEEE80211_EDMG_BW_CONFIG_14: 100 if (max_contiguous < 3) 101 return false; 102 break; 103 case IEEE80211_EDMG_BW_CONFIG_7: 104 case IEEE80211_EDMG_BW_CONFIG_11: 105 case IEEE80211_EDMG_BW_CONFIG_15: 106 if (max_contiguous < 4) 107 return false; 108 break; 109 110 default: 111 return false; 112 } 113 114 /* check bw_config against aggregated (non contiguous) edmg channels */ 115 switch (chandef->edmg.bw_config) { 116 case IEEE80211_EDMG_BW_CONFIG_4: 117 case IEEE80211_EDMG_BW_CONFIG_5: 118 case IEEE80211_EDMG_BW_CONFIG_6: 119 case IEEE80211_EDMG_BW_CONFIG_7: 120 break; 121 case IEEE80211_EDMG_BW_CONFIG_8: 122 case IEEE80211_EDMG_BW_CONFIG_9: 123 case IEEE80211_EDMG_BW_CONFIG_10: 124 case IEEE80211_EDMG_BW_CONFIG_11: 125 if (num_of_enabled < 2) 126 return false; 127 break; 128 case IEEE80211_EDMG_BW_CONFIG_12: 129 case IEEE80211_EDMG_BW_CONFIG_13: 130 case IEEE80211_EDMG_BW_CONFIG_14: 131 case IEEE80211_EDMG_BW_CONFIG_15: 132 if (num_of_enabled < 4 || max_contiguous < 2) 133 return false; 134 break; 135 default: 136 return false; 137 } 138 139 return true; 140 } 141 142 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) 143 { 144 u32 control_freq; 145 146 if (!chandef->chan) 147 return false; 148 149 control_freq = chandef->chan->center_freq; 150 151 switch (chandef->width) { 152 case NL80211_CHAN_WIDTH_5: 153 case NL80211_CHAN_WIDTH_10: 154 case NL80211_CHAN_WIDTH_20: 155 case NL80211_CHAN_WIDTH_20_NOHT: 156 if (chandef->center_freq1 != control_freq) 157 return false; 158 if (chandef->center_freq2) 159 return false; 160 break; 161 case NL80211_CHAN_WIDTH_40: 162 if (chandef->center_freq1 != control_freq + 10 && 163 chandef->center_freq1 != control_freq - 10) 164 return false; 165 if (chandef->center_freq2) 166 return false; 167 break; 168 case NL80211_CHAN_WIDTH_80P80: 169 if (chandef->center_freq1 != control_freq + 30 && 170 chandef->center_freq1 != control_freq + 10 && 171 chandef->center_freq1 != control_freq - 10 && 172 chandef->center_freq1 != control_freq - 30) 173 return false; 174 if (!chandef->center_freq2) 175 return false; 176 /* adjacent is not allowed -- that's a 160 MHz channel */ 177 if (chandef->center_freq1 - chandef->center_freq2 == 80 || 178 chandef->center_freq2 - chandef->center_freq1 == 80) 179 return false; 180 break; 181 case NL80211_CHAN_WIDTH_80: 182 if (chandef->center_freq1 != control_freq + 30 && 183 chandef->center_freq1 != control_freq + 10 && 184 chandef->center_freq1 != control_freq - 10 && 185 chandef->center_freq1 != control_freq - 30) 186 return false; 187 if (chandef->center_freq2) 188 return false; 189 break; 190 case NL80211_CHAN_WIDTH_160: 191 if (chandef->center_freq1 != control_freq + 70 && 192 chandef->center_freq1 != control_freq + 50 && 193 chandef->center_freq1 != control_freq + 30 && 194 chandef->center_freq1 != control_freq + 10 && 195 chandef->center_freq1 != control_freq - 10 && 196 chandef->center_freq1 != control_freq - 30 && 197 chandef->center_freq1 != control_freq - 50 && 198 chandef->center_freq1 != control_freq - 70) 199 return false; 200 if (chandef->center_freq2) 201 return false; 202 break; 203 default: 204 return false; 205 } 206 207 if (cfg80211_chandef_is_edmg(chandef) && 208 !cfg80211_edmg_chandef_valid(chandef)) 209 return false; 210 211 return true; 212 } 213 EXPORT_SYMBOL(cfg80211_chandef_valid); 214 215 static void chandef_primary_freqs(const struct cfg80211_chan_def *c, 216 u32 *pri40, u32 *pri80) 217 { 218 int tmp; 219 220 switch (c->width) { 221 case NL80211_CHAN_WIDTH_40: 222 *pri40 = c->center_freq1; 223 *pri80 = 0; 224 break; 225 case NL80211_CHAN_WIDTH_80: 226 case NL80211_CHAN_WIDTH_80P80: 227 *pri80 = c->center_freq1; 228 /* n_P20 */ 229 tmp = (30 + c->chan->center_freq - c->center_freq1)/20; 230 /* n_P40 */ 231 tmp /= 2; 232 /* freq_P40 */ 233 *pri40 = c->center_freq1 - 20 + 40 * tmp; 234 break; 235 case NL80211_CHAN_WIDTH_160: 236 /* n_P20 */ 237 tmp = (70 + c->chan->center_freq - c->center_freq1)/20; 238 /* n_P40 */ 239 tmp /= 2; 240 /* freq_P40 */ 241 *pri40 = c->center_freq1 - 60 + 40 * tmp; 242 /* n_P80 */ 243 tmp /= 2; 244 *pri80 = c->center_freq1 - 40 + 80 * tmp; 245 break; 246 default: 247 WARN_ON_ONCE(1); 248 } 249 } 250 251 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) 252 { 253 int width; 254 255 switch (c->width) { 256 case NL80211_CHAN_WIDTH_5: 257 width = 5; 258 break; 259 case NL80211_CHAN_WIDTH_10: 260 width = 10; 261 break; 262 case NL80211_CHAN_WIDTH_20: 263 case NL80211_CHAN_WIDTH_20_NOHT: 264 width = 20; 265 break; 266 case NL80211_CHAN_WIDTH_40: 267 width = 40; 268 break; 269 case NL80211_CHAN_WIDTH_80P80: 270 case NL80211_CHAN_WIDTH_80: 271 width = 80; 272 break; 273 case NL80211_CHAN_WIDTH_160: 274 width = 160; 275 break; 276 default: 277 WARN_ON_ONCE(1); 278 return -1; 279 } 280 return width; 281 } 282 283 const struct cfg80211_chan_def * 284 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, 285 const struct cfg80211_chan_def *c2) 286 { 287 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80; 288 289 /* If they are identical, return */ 290 if (cfg80211_chandef_identical(c1, c2)) 291 return c1; 292 293 /* otherwise, must have same control channel */ 294 if (c1->chan != c2->chan) 295 return NULL; 296 297 /* 298 * If they have the same width, but aren't identical, 299 * then they can't be compatible. 300 */ 301 if (c1->width == c2->width) 302 return NULL; 303 304 /* 305 * can't be compatible if one of them is 5 or 10 MHz, 306 * but they don't have the same width. 307 */ 308 if (c1->width == NL80211_CHAN_WIDTH_5 || 309 c1->width == NL80211_CHAN_WIDTH_10 || 310 c2->width == NL80211_CHAN_WIDTH_5 || 311 c2->width == NL80211_CHAN_WIDTH_10) 312 return NULL; 313 314 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || 315 c1->width == NL80211_CHAN_WIDTH_20) 316 return c2; 317 318 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || 319 c2->width == NL80211_CHAN_WIDTH_20) 320 return c1; 321 322 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80); 323 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80); 324 325 if (c1_pri40 != c2_pri40) 326 return NULL; 327 328 WARN_ON(!c1_pri80 && !c2_pri80); 329 if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80) 330 return NULL; 331 332 if (c1->width > c2->width) 333 return c1; 334 return c2; 335 } 336 EXPORT_SYMBOL(cfg80211_chandef_compatible); 337 338 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, 339 u32 bandwidth, 340 enum nl80211_dfs_state dfs_state) 341 { 342 struct ieee80211_channel *c; 343 u32 freq; 344 345 for (freq = center_freq - bandwidth/2 + 10; 346 freq <= center_freq + bandwidth/2 - 10; 347 freq += 20) { 348 c = ieee80211_get_channel(wiphy, freq); 349 if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) 350 continue; 351 352 c->dfs_state = dfs_state; 353 c->dfs_state_entered = jiffies; 354 } 355 } 356 357 void cfg80211_set_dfs_state(struct wiphy *wiphy, 358 const struct cfg80211_chan_def *chandef, 359 enum nl80211_dfs_state dfs_state) 360 { 361 int width; 362 363 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 364 return; 365 366 width = cfg80211_chandef_get_width(chandef); 367 if (width < 0) 368 return; 369 370 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1, 371 width, dfs_state); 372 373 if (!chandef->center_freq2) 374 return; 375 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2, 376 width, dfs_state); 377 } 378 379 static u32 cfg80211_get_start_freq(u32 center_freq, 380 u32 bandwidth) 381 { 382 u32 start_freq; 383 384 if (bandwidth <= 20) 385 start_freq = center_freq; 386 else 387 start_freq = center_freq - bandwidth/2 + 10; 388 389 return start_freq; 390 } 391 392 static u32 cfg80211_get_end_freq(u32 center_freq, 393 u32 bandwidth) 394 { 395 u32 end_freq; 396 397 if (bandwidth <= 20) 398 end_freq = center_freq; 399 else 400 end_freq = center_freq + bandwidth/2 - 10; 401 402 return end_freq; 403 } 404 405 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, 406 u32 center_freq, 407 u32 bandwidth) 408 { 409 struct ieee80211_channel *c; 410 u32 freq, start_freq, end_freq; 411 412 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 413 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 414 415 for (freq = start_freq; freq <= end_freq; freq += 20) { 416 c = ieee80211_get_channel(wiphy, freq); 417 if (!c) 418 return -EINVAL; 419 420 if (c->flags & IEEE80211_CHAN_RADAR) 421 return 1; 422 } 423 return 0; 424 } 425 426 427 int cfg80211_chandef_dfs_required(struct wiphy *wiphy, 428 const struct cfg80211_chan_def *chandef, 429 enum nl80211_iftype iftype) 430 { 431 int width; 432 int ret; 433 434 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 435 return -EINVAL; 436 437 switch (iftype) { 438 case NL80211_IFTYPE_ADHOC: 439 case NL80211_IFTYPE_AP: 440 case NL80211_IFTYPE_P2P_GO: 441 case NL80211_IFTYPE_MESH_POINT: 442 width = cfg80211_chandef_get_width(chandef); 443 if (width < 0) 444 return -EINVAL; 445 446 ret = cfg80211_get_chans_dfs_required(wiphy, 447 chandef->center_freq1, 448 width); 449 if (ret < 0) 450 return ret; 451 else if (ret > 0) 452 return BIT(chandef->width); 453 454 if (!chandef->center_freq2) 455 return 0; 456 457 ret = cfg80211_get_chans_dfs_required(wiphy, 458 chandef->center_freq2, 459 width); 460 if (ret < 0) 461 return ret; 462 else if (ret > 0) 463 return BIT(chandef->width); 464 465 break; 466 case NL80211_IFTYPE_STATION: 467 case NL80211_IFTYPE_OCB: 468 case NL80211_IFTYPE_P2P_CLIENT: 469 case NL80211_IFTYPE_MONITOR: 470 case NL80211_IFTYPE_AP_VLAN: 471 case NL80211_IFTYPE_WDS: 472 case NL80211_IFTYPE_P2P_DEVICE: 473 case NL80211_IFTYPE_NAN: 474 break; 475 case NL80211_IFTYPE_UNSPECIFIED: 476 case NUM_NL80211_IFTYPES: 477 WARN_ON(1); 478 } 479 480 return 0; 481 } 482 EXPORT_SYMBOL(cfg80211_chandef_dfs_required); 483 484 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, 485 u32 center_freq, 486 u32 bandwidth) 487 { 488 struct ieee80211_channel *c; 489 u32 freq, start_freq, end_freq; 490 int count = 0; 491 492 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 493 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 494 495 /* 496 * Check entire range of channels for the bandwidth. 497 * Check all channels are DFS channels (DFS_USABLE or 498 * DFS_AVAILABLE). Return number of usable channels 499 * (require CAC). Allow DFS and non-DFS channel mix. 500 */ 501 for (freq = start_freq; freq <= end_freq; freq += 20) { 502 c = ieee80211_get_channel(wiphy, freq); 503 if (!c) 504 return -EINVAL; 505 506 if (c->flags & IEEE80211_CHAN_DISABLED) 507 return -EINVAL; 508 509 if (c->flags & IEEE80211_CHAN_RADAR) { 510 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) 511 return -EINVAL; 512 513 if (c->dfs_state == NL80211_DFS_USABLE) 514 count++; 515 } 516 } 517 518 return count; 519 } 520 521 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, 522 const struct cfg80211_chan_def *chandef) 523 { 524 int width; 525 int r1, r2 = 0; 526 527 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 528 return false; 529 530 width = cfg80211_chandef_get_width(chandef); 531 if (width < 0) 532 return false; 533 534 r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1, 535 width); 536 537 if (r1 < 0) 538 return false; 539 540 switch (chandef->width) { 541 case NL80211_CHAN_WIDTH_80P80: 542 WARN_ON(!chandef->center_freq2); 543 r2 = cfg80211_get_chans_dfs_usable(wiphy, 544 chandef->center_freq2, 545 width); 546 if (r2 < 0) 547 return false; 548 break; 549 default: 550 WARN_ON(chandef->center_freq2); 551 break; 552 } 553 554 return (r1 + r2 > 0); 555 } 556 557 /* 558 * Checks if center frequency of chan falls with in the bandwidth 559 * range of chandef. 560 */ 561 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef, 562 struct ieee80211_channel *chan) 563 { 564 int width; 565 u32 freq; 566 567 if (chandef->chan->center_freq == chan->center_freq) 568 return true; 569 570 width = cfg80211_chandef_get_width(chandef); 571 if (width <= 20) 572 return false; 573 574 for (freq = chandef->center_freq1 - width / 2 + 10; 575 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) { 576 if (chan->center_freq == freq) 577 return true; 578 } 579 580 if (!chandef->center_freq2) 581 return false; 582 583 for (freq = chandef->center_freq2 - width / 2 + 10; 584 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) { 585 if (chan->center_freq == freq) 586 return true; 587 } 588 589 return false; 590 } 591 592 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) 593 { 594 bool active = false; 595 596 ASSERT_WDEV_LOCK(wdev); 597 598 if (!wdev->chandef.chan) 599 return false; 600 601 switch (wdev->iftype) { 602 case NL80211_IFTYPE_AP: 603 case NL80211_IFTYPE_P2P_GO: 604 active = wdev->beacon_interval != 0; 605 break; 606 case NL80211_IFTYPE_ADHOC: 607 active = wdev->ssid_len != 0; 608 break; 609 case NL80211_IFTYPE_MESH_POINT: 610 active = wdev->mesh_id_len != 0; 611 break; 612 case NL80211_IFTYPE_STATION: 613 case NL80211_IFTYPE_OCB: 614 case NL80211_IFTYPE_P2P_CLIENT: 615 case NL80211_IFTYPE_MONITOR: 616 case NL80211_IFTYPE_AP_VLAN: 617 case NL80211_IFTYPE_WDS: 618 case NL80211_IFTYPE_P2P_DEVICE: 619 /* Can NAN type be considered as beaconing interface? */ 620 case NL80211_IFTYPE_NAN: 621 break; 622 case NL80211_IFTYPE_UNSPECIFIED: 623 case NUM_NL80211_IFTYPES: 624 WARN_ON(1); 625 } 626 627 return active; 628 } 629 630 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy, 631 struct ieee80211_channel *chan) 632 { 633 struct wireless_dev *wdev; 634 635 list_for_each_entry(wdev, &wiphy->wdev_list, list) { 636 wdev_lock(wdev); 637 if (!cfg80211_beaconing_iface_active(wdev)) { 638 wdev_unlock(wdev); 639 continue; 640 } 641 642 if (cfg80211_is_sub_chan(&wdev->chandef, chan)) { 643 wdev_unlock(wdev); 644 return true; 645 } 646 wdev_unlock(wdev); 647 } 648 649 return false; 650 } 651 652 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, 653 struct ieee80211_channel *chan) 654 { 655 struct cfg80211_registered_device *rdev; 656 657 ASSERT_RTNL(); 658 659 if (!(chan->flags & IEEE80211_CHAN_RADAR)) 660 return false; 661 662 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 663 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy)) 664 continue; 665 666 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan)) 667 return true; 668 } 669 670 return false; 671 } 672 673 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, 674 u32 center_freq, 675 u32 bandwidth) 676 { 677 struct ieee80211_channel *c; 678 u32 freq, start_freq, end_freq; 679 bool dfs_offload; 680 681 dfs_offload = wiphy_ext_feature_isset(wiphy, 682 NL80211_EXT_FEATURE_DFS_OFFLOAD); 683 684 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 685 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 686 687 /* 688 * Check entire range of channels for the bandwidth. 689 * If any channel in between is disabled or has not 690 * had gone through CAC return false 691 */ 692 for (freq = start_freq; freq <= end_freq; freq += 20) { 693 c = ieee80211_get_channel(wiphy, freq); 694 if (!c) 695 return false; 696 697 if (c->flags & IEEE80211_CHAN_DISABLED) 698 return false; 699 700 if ((c->flags & IEEE80211_CHAN_RADAR) && 701 (c->dfs_state != NL80211_DFS_AVAILABLE) && 702 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload)) 703 return false; 704 } 705 706 return true; 707 } 708 709 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 710 const struct cfg80211_chan_def *chandef) 711 { 712 int width; 713 int r; 714 715 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 716 return false; 717 718 width = cfg80211_chandef_get_width(chandef); 719 if (width < 0) 720 return false; 721 722 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1, 723 width); 724 725 /* If any of channels unavailable for cf1 just return */ 726 if (!r) 727 return r; 728 729 switch (chandef->width) { 730 case NL80211_CHAN_WIDTH_80P80: 731 WARN_ON(!chandef->center_freq2); 732 r = cfg80211_get_chans_dfs_available(wiphy, 733 chandef->center_freq2, 734 width); 735 break; 736 default: 737 WARN_ON(chandef->center_freq2); 738 break; 739 } 740 741 return r; 742 } 743 744 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, 745 u32 center_freq, 746 u32 bandwidth) 747 { 748 struct ieee80211_channel *c; 749 u32 start_freq, end_freq, freq; 750 unsigned int dfs_cac_ms = 0; 751 752 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 753 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 754 755 for (freq = start_freq; freq <= end_freq; freq += 20) { 756 c = ieee80211_get_channel(wiphy, freq); 757 if (!c) 758 return 0; 759 760 if (c->flags & IEEE80211_CHAN_DISABLED) 761 return 0; 762 763 if (!(c->flags & IEEE80211_CHAN_RADAR)) 764 continue; 765 766 if (c->dfs_cac_ms > dfs_cac_ms) 767 dfs_cac_ms = c->dfs_cac_ms; 768 } 769 770 return dfs_cac_ms; 771 } 772 773 unsigned int 774 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 775 const struct cfg80211_chan_def *chandef) 776 { 777 int width; 778 unsigned int t1 = 0, t2 = 0; 779 780 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 781 return 0; 782 783 width = cfg80211_chandef_get_width(chandef); 784 if (width < 0) 785 return 0; 786 787 t1 = cfg80211_get_chans_dfs_cac_time(wiphy, 788 chandef->center_freq1, 789 width); 790 791 if (!chandef->center_freq2) 792 return t1; 793 794 t2 = cfg80211_get_chans_dfs_cac_time(wiphy, 795 chandef->center_freq2, 796 width); 797 798 return max(t1, t2); 799 } 800 801 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, 802 u32 center_freq, u32 bandwidth, 803 u32 prohibited_flags) 804 { 805 struct ieee80211_channel *c; 806 u32 freq, start_freq, end_freq; 807 808 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 809 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 810 811 for (freq = start_freq; freq <= end_freq; freq += 20) { 812 c = ieee80211_get_channel(wiphy, freq); 813 if (!c || c->flags & prohibited_flags) 814 return false; 815 } 816 817 return true; 818 } 819 820 /* check if the operating channels are valid and supported */ 821 static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels, 822 enum ieee80211_edmg_bw_config edmg_bw_config, 823 int primary_channel, 824 struct ieee80211_edmg *edmg_cap) 825 { 826 struct ieee80211_channel *chan; 827 int i, freq; 828 int channels_counter = 0; 829 830 if (!edmg_channels && !edmg_bw_config) 831 return true; 832 833 if ((!edmg_channels && edmg_bw_config) || 834 (edmg_channels && !edmg_bw_config)) 835 return false; 836 837 if (!(edmg_channels & BIT(primary_channel - 1))) 838 return false; 839 840 /* 60GHz channels 1..6 */ 841 for (i = 0; i < 6; i++) { 842 if (!(edmg_channels & BIT(i))) 843 continue; 844 845 if (!(edmg_cap->channels & BIT(i))) 846 return false; 847 848 channels_counter++; 849 850 freq = ieee80211_channel_to_frequency(i + 1, 851 NL80211_BAND_60GHZ); 852 chan = ieee80211_get_channel(wiphy, freq); 853 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) 854 return false; 855 } 856 857 /* IEEE802.11 allows max 4 channels */ 858 if (channels_counter > 4) 859 return false; 860 861 /* check bw_config is a subset of what driver supports 862 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13) 863 */ 864 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4)) 865 return false; 866 867 if (edmg_bw_config > edmg_cap->bw_config) 868 return false; 869 870 return true; 871 } 872 873 bool cfg80211_chandef_usable(struct wiphy *wiphy, 874 const struct cfg80211_chan_def *chandef, 875 u32 prohibited_flags) 876 { 877 struct ieee80211_sta_ht_cap *ht_cap; 878 struct ieee80211_sta_vht_cap *vht_cap; 879 struct ieee80211_edmg *edmg_cap; 880 u32 width, control_freq, cap; 881 882 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 883 return false; 884 885 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 886 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 887 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap; 888 889 if (edmg_cap->channels && 890 !cfg80211_edmg_usable(wiphy, 891 chandef->edmg.channels, 892 chandef->edmg.bw_config, 893 chandef->chan->hw_value, 894 edmg_cap)) 895 return false; 896 897 control_freq = chandef->chan->center_freq; 898 899 switch (chandef->width) { 900 case NL80211_CHAN_WIDTH_5: 901 width = 5; 902 break; 903 case NL80211_CHAN_WIDTH_10: 904 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 905 width = 10; 906 break; 907 case NL80211_CHAN_WIDTH_20: 908 if (!ht_cap->ht_supported) 909 return false; 910 /* fall through */ 911 case NL80211_CHAN_WIDTH_20_NOHT: 912 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 913 width = 20; 914 break; 915 case NL80211_CHAN_WIDTH_40: 916 width = 40; 917 if (!ht_cap->ht_supported) 918 return false; 919 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 920 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 921 return false; 922 if (chandef->center_freq1 < control_freq && 923 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 924 return false; 925 if (chandef->center_freq1 > control_freq && 926 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 927 return false; 928 break; 929 case NL80211_CHAN_WIDTH_80P80: 930 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 931 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 932 return false; 933 /* fall through */ 934 case NL80211_CHAN_WIDTH_80: 935 if (!vht_cap->vht_supported) 936 return false; 937 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 938 width = 80; 939 break; 940 case NL80211_CHAN_WIDTH_160: 941 if (!vht_cap->vht_supported) 942 return false; 943 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 944 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 945 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 946 return false; 947 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 948 width = 160; 949 break; 950 default: 951 WARN_ON_ONCE(1); 952 return false; 953 } 954 955 /* 956 * TODO: What if there are only certain 80/160/80+80 MHz channels 957 * allowed by the driver, or only certain combinations? 958 * For 40 MHz the driver can set the NO_HT40 flags, but for 959 * 80/160 MHz and in particular 80+80 MHz this isn't really 960 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 961 * no way to cover 80+80 MHz or more complex restrictions. 962 * Note that such restrictions also need to be advertised to 963 * userspace, for example for P2P channel selection. 964 */ 965 966 if (width > 20) 967 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 968 969 /* 5 and 10 MHz are only defined for the OFDM PHY */ 970 if (width < 20) 971 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 972 973 974 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1, 975 width, prohibited_flags)) 976 return false; 977 978 if (!chandef->center_freq2) 979 return true; 980 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, 981 width, prohibited_flags); 982 } 983 EXPORT_SYMBOL(cfg80211_chandef_usable); 984 985 /* 986 * Check if the channel can be used under permissive conditions mandated by 987 * some regulatory bodies, i.e., the channel is marked with 988 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface 989 * associated to an AP on the same channel or on the same UNII band 990 * (assuming that the AP is an authorized master). 991 * In addition allow operation on a channel on which indoor operation is 992 * allowed, iff we are currently operating in an indoor environment. 993 */ 994 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 995 enum nl80211_iftype iftype, 996 struct ieee80211_channel *chan) 997 { 998 struct wireless_dev *wdev; 999 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1000 1001 ASSERT_RTNL(); 1002 1003 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || 1004 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 1005 return false; 1006 1007 /* only valid for GO and TDLS off-channel (station/p2p-CL) */ 1008 if (iftype != NL80211_IFTYPE_P2P_GO && 1009 iftype != NL80211_IFTYPE_STATION && 1010 iftype != NL80211_IFTYPE_P2P_CLIENT) 1011 return false; 1012 1013 if (regulatory_indoor_allowed() && 1014 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1015 return true; 1016 1017 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) 1018 return false; 1019 1020 /* 1021 * Generally, it is possible to rely on another device/driver to allow 1022 * the IR concurrent relaxation, however, since the device can further 1023 * enforce the relaxation (by doing a similar verifications as this), 1024 * and thus fail the GO instantiation, consider only the interfaces of 1025 * the current registered device. 1026 */ 1027 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 1028 struct ieee80211_channel *other_chan = NULL; 1029 int r1, r2; 1030 1031 wdev_lock(wdev); 1032 if (wdev->iftype == NL80211_IFTYPE_STATION && 1033 wdev->current_bss) 1034 other_chan = wdev->current_bss->pub.channel; 1035 1036 /* 1037 * If a GO already operates on the same GO_CONCURRENT channel, 1038 * this one (maybe the same one) can beacon as well. We allow 1039 * the operation even if the station we relied on with 1040 * GO_CONCURRENT is disconnected now. But then we must make sure 1041 * we're not outdoor on an indoor-only channel. 1042 */ 1043 if (iftype == NL80211_IFTYPE_P2P_GO && 1044 wdev->iftype == NL80211_IFTYPE_P2P_GO && 1045 wdev->beacon_interval && 1046 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1047 other_chan = wdev->chandef.chan; 1048 wdev_unlock(wdev); 1049 1050 if (!other_chan) 1051 continue; 1052 1053 if (chan == other_chan) 1054 return true; 1055 1056 if (chan->band != NL80211_BAND_5GHZ && 1057 chan->band != NL80211_BAND_6GHZ) 1058 continue; 1059 1060 r1 = cfg80211_get_unii(chan->center_freq); 1061 r2 = cfg80211_get_unii(other_chan->center_freq); 1062 1063 if (r1 != -EINVAL && r1 == r2) { 1064 /* 1065 * At some locations channels 149-165 are considered a 1066 * bundle, but at other locations, e.g., Indonesia, 1067 * channels 149-161 are considered a bundle while 1068 * channel 165 is left out and considered to be in a 1069 * different bundle. Thus, in case that there is a 1070 * station interface connected to an AP on channel 165, 1071 * it is assumed that channels 149-161 are allowed for 1072 * GO operations. However, having a station interface 1073 * connected to an AP on channels 149-161, does not 1074 * allow GO operation on channel 165. 1075 */ 1076 if (chan->center_freq == 5825 && 1077 other_chan->center_freq != 5825) 1078 continue; 1079 return true; 1080 } 1081 } 1082 1083 return false; 1084 } 1085 1086 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, 1087 struct cfg80211_chan_def *chandef, 1088 enum nl80211_iftype iftype, 1089 bool check_no_ir) 1090 { 1091 bool res; 1092 u32 prohibited_flags = IEEE80211_CHAN_DISABLED | 1093 IEEE80211_CHAN_RADAR; 1094 1095 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 1096 1097 if (check_no_ir) 1098 prohibited_flags |= IEEE80211_CHAN_NO_IR; 1099 1100 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && 1101 cfg80211_chandef_dfs_available(wiphy, chandef)) { 1102 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 1103 prohibited_flags = IEEE80211_CHAN_DISABLED; 1104 } 1105 1106 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); 1107 1108 trace_cfg80211_return_bool(res); 1109 return res; 1110 } 1111 1112 bool cfg80211_reg_can_beacon(struct wiphy *wiphy, 1113 struct cfg80211_chan_def *chandef, 1114 enum nl80211_iftype iftype) 1115 { 1116 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); 1117 } 1118 EXPORT_SYMBOL(cfg80211_reg_can_beacon); 1119 1120 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, 1121 struct cfg80211_chan_def *chandef, 1122 enum nl80211_iftype iftype) 1123 { 1124 bool check_no_ir; 1125 1126 ASSERT_RTNL(); 1127 1128 /* 1129 * Under certain conditions suggested by some regulatory bodies a 1130 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag 1131 * only if such relaxations are not enabled and the conditions are not 1132 * met. 1133 */ 1134 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, 1135 chandef->chan); 1136 1137 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 1138 } 1139 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); 1140 1141 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 1142 struct cfg80211_chan_def *chandef) 1143 { 1144 if (!rdev->ops->set_monitor_channel) 1145 return -EOPNOTSUPP; 1146 if (!cfg80211_has_monitors_only(rdev)) 1147 return -EBUSY; 1148 1149 return rdev_set_monitor_channel(rdev, chandef); 1150 } 1151 1152 void 1153 cfg80211_get_chan_state(struct wireless_dev *wdev, 1154 struct ieee80211_channel **chan, 1155 enum cfg80211_chan_mode *chanmode, 1156 u8 *radar_detect) 1157 { 1158 int ret; 1159 1160 *chan = NULL; 1161 *chanmode = CHAN_MODE_UNDEFINED; 1162 1163 ASSERT_WDEV_LOCK(wdev); 1164 1165 if (wdev->netdev && !netif_running(wdev->netdev)) 1166 return; 1167 1168 switch (wdev->iftype) { 1169 case NL80211_IFTYPE_ADHOC: 1170 if (wdev->current_bss) { 1171 *chan = wdev->current_bss->pub.channel; 1172 *chanmode = (wdev->ibss_fixed && 1173 !wdev->ibss_dfs_possible) 1174 ? CHAN_MODE_SHARED 1175 : CHAN_MODE_EXCLUSIVE; 1176 1177 /* consider worst-case - IBSS can try to return to the 1178 * original user-specified channel as creator */ 1179 if (wdev->ibss_dfs_possible) 1180 *radar_detect |= BIT(wdev->chandef.width); 1181 return; 1182 } 1183 break; 1184 case NL80211_IFTYPE_STATION: 1185 case NL80211_IFTYPE_P2P_CLIENT: 1186 if (wdev->current_bss) { 1187 *chan = wdev->current_bss->pub.channel; 1188 *chanmode = CHAN_MODE_SHARED; 1189 return; 1190 } 1191 break; 1192 case NL80211_IFTYPE_AP: 1193 case NL80211_IFTYPE_P2P_GO: 1194 if (wdev->cac_started) { 1195 *chan = wdev->chandef.chan; 1196 *chanmode = CHAN_MODE_SHARED; 1197 *radar_detect |= BIT(wdev->chandef.width); 1198 } else if (wdev->beacon_interval) { 1199 *chan = wdev->chandef.chan; 1200 *chanmode = CHAN_MODE_SHARED; 1201 1202 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 1203 &wdev->chandef, 1204 wdev->iftype); 1205 WARN_ON(ret < 0); 1206 if (ret > 0) 1207 *radar_detect |= BIT(wdev->chandef.width); 1208 } 1209 return; 1210 case NL80211_IFTYPE_MESH_POINT: 1211 if (wdev->mesh_id_len) { 1212 *chan = wdev->chandef.chan; 1213 *chanmode = CHAN_MODE_SHARED; 1214 1215 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 1216 &wdev->chandef, 1217 wdev->iftype); 1218 WARN_ON(ret < 0); 1219 if (ret > 0) 1220 *radar_detect |= BIT(wdev->chandef.width); 1221 } 1222 return; 1223 case NL80211_IFTYPE_OCB: 1224 if (wdev->chandef.chan) { 1225 *chan = wdev->chandef.chan; 1226 *chanmode = CHAN_MODE_SHARED; 1227 return; 1228 } 1229 break; 1230 case NL80211_IFTYPE_MONITOR: 1231 case NL80211_IFTYPE_AP_VLAN: 1232 case NL80211_IFTYPE_WDS: 1233 case NL80211_IFTYPE_P2P_DEVICE: 1234 case NL80211_IFTYPE_NAN: 1235 /* these interface types don't really have a channel */ 1236 return; 1237 case NL80211_IFTYPE_UNSPECIFIED: 1238 case NUM_NL80211_IFTYPES: 1239 WARN_ON(1); 1240 } 1241 } 1242