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 /* channel 14 is only for IEEE 802.11b */ 208 if (chandef->center_freq1 == 2484 && 209 chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 210 return false; 211 212 if (cfg80211_chandef_is_edmg(chandef) && 213 !cfg80211_edmg_chandef_valid(chandef)) 214 return false; 215 216 return true; 217 } 218 EXPORT_SYMBOL(cfg80211_chandef_valid); 219 220 static void chandef_primary_freqs(const struct cfg80211_chan_def *c, 221 u32 *pri40, u32 *pri80) 222 { 223 int tmp; 224 225 switch (c->width) { 226 case NL80211_CHAN_WIDTH_40: 227 *pri40 = c->center_freq1; 228 *pri80 = 0; 229 break; 230 case NL80211_CHAN_WIDTH_80: 231 case NL80211_CHAN_WIDTH_80P80: 232 *pri80 = c->center_freq1; 233 /* n_P20 */ 234 tmp = (30 + c->chan->center_freq - c->center_freq1)/20; 235 /* n_P40 */ 236 tmp /= 2; 237 /* freq_P40 */ 238 *pri40 = c->center_freq1 - 20 + 40 * tmp; 239 break; 240 case NL80211_CHAN_WIDTH_160: 241 /* n_P20 */ 242 tmp = (70 + c->chan->center_freq - c->center_freq1)/20; 243 /* n_P40 */ 244 tmp /= 2; 245 /* freq_P40 */ 246 *pri40 = c->center_freq1 - 60 + 40 * tmp; 247 /* n_P80 */ 248 tmp /= 2; 249 *pri80 = c->center_freq1 - 40 + 80 * tmp; 250 break; 251 default: 252 WARN_ON_ONCE(1); 253 } 254 } 255 256 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) 257 { 258 int width; 259 260 switch (c->width) { 261 case NL80211_CHAN_WIDTH_5: 262 width = 5; 263 break; 264 case NL80211_CHAN_WIDTH_10: 265 width = 10; 266 break; 267 case NL80211_CHAN_WIDTH_20: 268 case NL80211_CHAN_WIDTH_20_NOHT: 269 width = 20; 270 break; 271 case NL80211_CHAN_WIDTH_40: 272 width = 40; 273 break; 274 case NL80211_CHAN_WIDTH_80P80: 275 case NL80211_CHAN_WIDTH_80: 276 width = 80; 277 break; 278 case NL80211_CHAN_WIDTH_160: 279 width = 160; 280 break; 281 default: 282 WARN_ON_ONCE(1); 283 return -1; 284 } 285 return width; 286 } 287 288 const struct cfg80211_chan_def * 289 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, 290 const struct cfg80211_chan_def *c2) 291 { 292 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80; 293 294 /* If they are identical, return */ 295 if (cfg80211_chandef_identical(c1, c2)) 296 return c1; 297 298 /* otherwise, must have same control channel */ 299 if (c1->chan != c2->chan) 300 return NULL; 301 302 /* 303 * If they have the same width, but aren't identical, 304 * then they can't be compatible. 305 */ 306 if (c1->width == c2->width) 307 return NULL; 308 309 /* 310 * can't be compatible if one of them is 5 or 10 MHz, 311 * but they don't have the same width. 312 */ 313 if (c1->width == NL80211_CHAN_WIDTH_5 || 314 c1->width == NL80211_CHAN_WIDTH_10 || 315 c2->width == NL80211_CHAN_WIDTH_5 || 316 c2->width == NL80211_CHAN_WIDTH_10) 317 return NULL; 318 319 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || 320 c1->width == NL80211_CHAN_WIDTH_20) 321 return c2; 322 323 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || 324 c2->width == NL80211_CHAN_WIDTH_20) 325 return c1; 326 327 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80); 328 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80); 329 330 if (c1_pri40 != c2_pri40) 331 return NULL; 332 333 WARN_ON(!c1_pri80 && !c2_pri80); 334 if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80) 335 return NULL; 336 337 if (c1->width > c2->width) 338 return c1; 339 return c2; 340 } 341 EXPORT_SYMBOL(cfg80211_chandef_compatible); 342 343 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, 344 u32 bandwidth, 345 enum nl80211_dfs_state dfs_state) 346 { 347 struct ieee80211_channel *c; 348 u32 freq; 349 350 for (freq = center_freq - bandwidth/2 + 10; 351 freq <= center_freq + bandwidth/2 - 10; 352 freq += 20) { 353 c = ieee80211_get_channel(wiphy, freq); 354 if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) 355 continue; 356 357 c->dfs_state = dfs_state; 358 c->dfs_state_entered = jiffies; 359 } 360 } 361 362 void cfg80211_set_dfs_state(struct wiphy *wiphy, 363 const struct cfg80211_chan_def *chandef, 364 enum nl80211_dfs_state dfs_state) 365 { 366 int width; 367 368 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 369 return; 370 371 width = cfg80211_chandef_get_width(chandef); 372 if (width < 0) 373 return; 374 375 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1, 376 width, dfs_state); 377 378 if (!chandef->center_freq2) 379 return; 380 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2, 381 width, dfs_state); 382 } 383 384 static u32 cfg80211_get_start_freq(u32 center_freq, 385 u32 bandwidth) 386 { 387 u32 start_freq; 388 389 if (bandwidth <= 20) 390 start_freq = center_freq; 391 else 392 start_freq = center_freq - bandwidth/2 + 10; 393 394 return start_freq; 395 } 396 397 static u32 cfg80211_get_end_freq(u32 center_freq, 398 u32 bandwidth) 399 { 400 u32 end_freq; 401 402 if (bandwidth <= 20) 403 end_freq = center_freq; 404 else 405 end_freq = center_freq + bandwidth/2 - 10; 406 407 return end_freq; 408 } 409 410 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, 411 u32 center_freq, 412 u32 bandwidth) 413 { 414 struct ieee80211_channel *c; 415 u32 freq, start_freq, end_freq; 416 417 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 418 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 419 420 for (freq = start_freq; freq <= end_freq; freq += 20) { 421 c = ieee80211_get_channel(wiphy, freq); 422 if (!c) 423 return -EINVAL; 424 425 if (c->flags & IEEE80211_CHAN_RADAR) 426 return 1; 427 } 428 return 0; 429 } 430 431 432 int cfg80211_chandef_dfs_required(struct wiphy *wiphy, 433 const struct cfg80211_chan_def *chandef, 434 enum nl80211_iftype iftype) 435 { 436 int width; 437 int ret; 438 439 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 440 return -EINVAL; 441 442 switch (iftype) { 443 case NL80211_IFTYPE_ADHOC: 444 case NL80211_IFTYPE_AP: 445 case NL80211_IFTYPE_P2P_GO: 446 case NL80211_IFTYPE_MESH_POINT: 447 width = cfg80211_chandef_get_width(chandef); 448 if (width < 0) 449 return -EINVAL; 450 451 ret = cfg80211_get_chans_dfs_required(wiphy, 452 chandef->center_freq1, 453 width); 454 if (ret < 0) 455 return ret; 456 else if (ret > 0) 457 return BIT(chandef->width); 458 459 if (!chandef->center_freq2) 460 return 0; 461 462 ret = cfg80211_get_chans_dfs_required(wiphy, 463 chandef->center_freq2, 464 width); 465 if (ret < 0) 466 return ret; 467 else if (ret > 0) 468 return BIT(chandef->width); 469 470 break; 471 case NL80211_IFTYPE_STATION: 472 case NL80211_IFTYPE_OCB: 473 case NL80211_IFTYPE_P2P_CLIENT: 474 case NL80211_IFTYPE_MONITOR: 475 case NL80211_IFTYPE_AP_VLAN: 476 case NL80211_IFTYPE_WDS: 477 case NL80211_IFTYPE_P2P_DEVICE: 478 case NL80211_IFTYPE_NAN: 479 break; 480 case NL80211_IFTYPE_UNSPECIFIED: 481 case NUM_NL80211_IFTYPES: 482 WARN_ON(1); 483 } 484 485 return 0; 486 } 487 EXPORT_SYMBOL(cfg80211_chandef_dfs_required); 488 489 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, 490 u32 center_freq, 491 u32 bandwidth) 492 { 493 struct ieee80211_channel *c; 494 u32 freq, start_freq, end_freq; 495 int count = 0; 496 497 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 498 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 499 500 /* 501 * Check entire range of channels for the bandwidth. 502 * Check all channels are DFS channels (DFS_USABLE or 503 * DFS_AVAILABLE). Return number of usable channels 504 * (require CAC). Allow DFS and non-DFS channel mix. 505 */ 506 for (freq = start_freq; freq <= end_freq; freq += 20) { 507 c = ieee80211_get_channel(wiphy, freq); 508 if (!c) 509 return -EINVAL; 510 511 if (c->flags & IEEE80211_CHAN_DISABLED) 512 return -EINVAL; 513 514 if (c->flags & IEEE80211_CHAN_RADAR) { 515 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) 516 return -EINVAL; 517 518 if (c->dfs_state == NL80211_DFS_USABLE) 519 count++; 520 } 521 } 522 523 return count; 524 } 525 526 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, 527 const struct cfg80211_chan_def *chandef) 528 { 529 int width; 530 int r1, r2 = 0; 531 532 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 533 return false; 534 535 width = cfg80211_chandef_get_width(chandef); 536 if (width < 0) 537 return false; 538 539 r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1, 540 width); 541 542 if (r1 < 0) 543 return false; 544 545 switch (chandef->width) { 546 case NL80211_CHAN_WIDTH_80P80: 547 WARN_ON(!chandef->center_freq2); 548 r2 = cfg80211_get_chans_dfs_usable(wiphy, 549 chandef->center_freq2, 550 width); 551 if (r2 < 0) 552 return false; 553 break; 554 default: 555 WARN_ON(chandef->center_freq2); 556 break; 557 } 558 559 return (r1 + r2 > 0); 560 } 561 562 /* 563 * Checks if center frequency of chan falls with in the bandwidth 564 * range of chandef. 565 */ 566 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef, 567 struct ieee80211_channel *chan) 568 { 569 int width; 570 u32 freq; 571 572 if (chandef->chan->center_freq == chan->center_freq) 573 return true; 574 575 width = cfg80211_chandef_get_width(chandef); 576 if (width <= 20) 577 return false; 578 579 for (freq = chandef->center_freq1 - width / 2 + 10; 580 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) { 581 if (chan->center_freq == freq) 582 return true; 583 } 584 585 if (!chandef->center_freq2) 586 return false; 587 588 for (freq = chandef->center_freq2 - width / 2 + 10; 589 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) { 590 if (chan->center_freq == freq) 591 return true; 592 } 593 594 return false; 595 } 596 597 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) 598 { 599 bool active = false; 600 601 ASSERT_WDEV_LOCK(wdev); 602 603 if (!wdev->chandef.chan) 604 return false; 605 606 switch (wdev->iftype) { 607 case NL80211_IFTYPE_AP: 608 case NL80211_IFTYPE_P2P_GO: 609 active = wdev->beacon_interval != 0; 610 break; 611 case NL80211_IFTYPE_ADHOC: 612 active = wdev->ssid_len != 0; 613 break; 614 case NL80211_IFTYPE_MESH_POINT: 615 active = wdev->mesh_id_len != 0; 616 break; 617 case NL80211_IFTYPE_STATION: 618 case NL80211_IFTYPE_OCB: 619 case NL80211_IFTYPE_P2P_CLIENT: 620 case NL80211_IFTYPE_MONITOR: 621 case NL80211_IFTYPE_AP_VLAN: 622 case NL80211_IFTYPE_WDS: 623 case NL80211_IFTYPE_P2P_DEVICE: 624 /* Can NAN type be considered as beaconing interface? */ 625 case NL80211_IFTYPE_NAN: 626 break; 627 case NL80211_IFTYPE_UNSPECIFIED: 628 case NUM_NL80211_IFTYPES: 629 WARN_ON(1); 630 } 631 632 return active; 633 } 634 635 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy, 636 struct ieee80211_channel *chan) 637 { 638 struct wireless_dev *wdev; 639 640 list_for_each_entry(wdev, &wiphy->wdev_list, list) { 641 wdev_lock(wdev); 642 if (!cfg80211_beaconing_iface_active(wdev)) { 643 wdev_unlock(wdev); 644 continue; 645 } 646 647 if (cfg80211_is_sub_chan(&wdev->chandef, chan)) { 648 wdev_unlock(wdev); 649 return true; 650 } 651 wdev_unlock(wdev); 652 } 653 654 return false; 655 } 656 657 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, 658 struct ieee80211_channel *chan) 659 { 660 struct cfg80211_registered_device *rdev; 661 662 ASSERT_RTNL(); 663 664 if (!(chan->flags & IEEE80211_CHAN_RADAR)) 665 return false; 666 667 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 668 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy)) 669 continue; 670 671 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan)) 672 return true; 673 } 674 675 return false; 676 } 677 678 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, 679 u32 center_freq, 680 u32 bandwidth) 681 { 682 struct ieee80211_channel *c; 683 u32 freq, start_freq, end_freq; 684 bool dfs_offload; 685 686 dfs_offload = wiphy_ext_feature_isset(wiphy, 687 NL80211_EXT_FEATURE_DFS_OFFLOAD); 688 689 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 690 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 691 692 /* 693 * Check entire range of channels for the bandwidth. 694 * If any channel in between is disabled or has not 695 * had gone through CAC return false 696 */ 697 for (freq = start_freq; freq <= end_freq; freq += 20) { 698 c = ieee80211_get_channel(wiphy, freq); 699 if (!c) 700 return false; 701 702 if (c->flags & IEEE80211_CHAN_DISABLED) 703 return false; 704 705 if ((c->flags & IEEE80211_CHAN_RADAR) && 706 (c->dfs_state != NL80211_DFS_AVAILABLE) && 707 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload)) 708 return false; 709 } 710 711 return true; 712 } 713 714 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 715 const struct cfg80211_chan_def *chandef) 716 { 717 int width; 718 int r; 719 720 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 721 return false; 722 723 width = cfg80211_chandef_get_width(chandef); 724 if (width < 0) 725 return false; 726 727 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1, 728 width); 729 730 /* If any of channels unavailable for cf1 just return */ 731 if (!r) 732 return r; 733 734 switch (chandef->width) { 735 case NL80211_CHAN_WIDTH_80P80: 736 WARN_ON(!chandef->center_freq2); 737 r = cfg80211_get_chans_dfs_available(wiphy, 738 chandef->center_freq2, 739 width); 740 break; 741 default: 742 WARN_ON(chandef->center_freq2); 743 break; 744 } 745 746 return r; 747 } 748 749 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, 750 u32 center_freq, 751 u32 bandwidth) 752 { 753 struct ieee80211_channel *c; 754 u32 start_freq, end_freq, freq; 755 unsigned int dfs_cac_ms = 0; 756 757 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 758 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 759 760 for (freq = start_freq; freq <= end_freq; freq += 20) { 761 c = ieee80211_get_channel(wiphy, freq); 762 if (!c) 763 return 0; 764 765 if (c->flags & IEEE80211_CHAN_DISABLED) 766 return 0; 767 768 if (!(c->flags & IEEE80211_CHAN_RADAR)) 769 continue; 770 771 if (c->dfs_cac_ms > dfs_cac_ms) 772 dfs_cac_ms = c->dfs_cac_ms; 773 } 774 775 return dfs_cac_ms; 776 } 777 778 unsigned int 779 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 780 const struct cfg80211_chan_def *chandef) 781 { 782 int width; 783 unsigned int t1 = 0, t2 = 0; 784 785 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 786 return 0; 787 788 width = cfg80211_chandef_get_width(chandef); 789 if (width < 0) 790 return 0; 791 792 t1 = cfg80211_get_chans_dfs_cac_time(wiphy, 793 chandef->center_freq1, 794 width); 795 796 if (!chandef->center_freq2) 797 return t1; 798 799 t2 = cfg80211_get_chans_dfs_cac_time(wiphy, 800 chandef->center_freq2, 801 width); 802 803 return max(t1, t2); 804 } 805 806 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, 807 u32 center_freq, u32 bandwidth, 808 u32 prohibited_flags) 809 { 810 struct ieee80211_channel *c; 811 u32 freq, start_freq, end_freq; 812 813 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 814 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 815 816 for (freq = start_freq; freq <= end_freq; freq += 20) { 817 c = ieee80211_get_channel(wiphy, freq); 818 if (!c || c->flags & prohibited_flags) 819 return false; 820 } 821 822 return true; 823 } 824 825 /* check if the operating channels are valid and supported */ 826 static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels, 827 enum ieee80211_edmg_bw_config edmg_bw_config, 828 int primary_channel, 829 struct ieee80211_edmg *edmg_cap) 830 { 831 struct ieee80211_channel *chan; 832 int i, freq; 833 int channels_counter = 0; 834 835 if (!edmg_channels && !edmg_bw_config) 836 return true; 837 838 if ((!edmg_channels && edmg_bw_config) || 839 (edmg_channels && !edmg_bw_config)) 840 return false; 841 842 if (!(edmg_channels & BIT(primary_channel - 1))) 843 return false; 844 845 /* 60GHz channels 1..6 */ 846 for (i = 0; i < 6; i++) { 847 if (!(edmg_channels & BIT(i))) 848 continue; 849 850 if (!(edmg_cap->channels & BIT(i))) 851 return false; 852 853 channels_counter++; 854 855 freq = ieee80211_channel_to_frequency(i + 1, 856 NL80211_BAND_60GHZ); 857 chan = ieee80211_get_channel(wiphy, freq); 858 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) 859 return false; 860 } 861 862 /* IEEE802.11 allows max 4 channels */ 863 if (channels_counter > 4) 864 return false; 865 866 /* check bw_config is a subset of what driver supports 867 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13) 868 */ 869 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4)) 870 return false; 871 872 if (edmg_bw_config > edmg_cap->bw_config) 873 return false; 874 875 return true; 876 } 877 878 bool cfg80211_chandef_usable(struct wiphy *wiphy, 879 const struct cfg80211_chan_def *chandef, 880 u32 prohibited_flags) 881 { 882 struct ieee80211_sta_ht_cap *ht_cap; 883 struct ieee80211_sta_vht_cap *vht_cap; 884 struct ieee80211_edmg *edmg_cap; 885 u32 width, control_freq, cap; 886 887 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 888 return false; 889 890 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 891 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 892 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap; 893 894 if (edmg_cap->channels && 895 !cfg80211_edmg_usable(wiphy, 896 chandef->edmg.channels, 897 chandef->edmg.bw_config, 898 chandef->chan->hw_value, 899 edmg_cap)) 900 return false; 901 902 control_freq = chandef->chan->center_freq; 903 904 switch (chandef->width) { 905 case NL80211_CHAN_WIDTH_5: 906 width = 5; 907 break; 908 case NL80211_CHAN_WIDTH_10: 909 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 910 width = 10; 911 break; 912 case NL80211_CHAN_WIDTH_20: 913 if (!ht_cap->ht_supported) 914 return false; 915 /* fall through */ 916 case NL80211_CHAN_WIDTH_20_NOHT: 917 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 918 width = 20; 919 break; 920 case NL80211_CHAN_WIDTH_40: 921 width = 40; 922 if (!ht_cap->ht_supported) 923 return false; 924 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 925 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 926 return false; 927 if (chandef->center_freq1 < control_freq && 928 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 929 return false; 930 if (chandef->center_freq1 > control_freq && 931 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 932 return false; 933 break; 934 case NL80211_CHAN_WIDTH_80P80: 935 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 936 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 937 return false; 938 /* fall through */ 939 case NL80211_CHAN_WIDTH_80: 940 if (!vht_cap->vht_supported) 941 return false; 942 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 943 width = 80; 944 break; 945 case NL80211_CHAN_WIDTH_160: 946 if (!vht_cap->vht_supported) 947 return false; 948 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 949 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 950 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 951 return false; 952 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 953 width = 160; 954 break; 955 default: 956 WARN_ON_ONCE(1); 957 return false; 958 } 959 960 /* 961 * TODO: What if there are only certain 80/160/80+80 MHz channels 962 * allowed by the driver, or only certain combinations? 963 * For 40 MHz the driver can set the NO_HT40 flags, but for 964 * 80/160 MHz and in particular 80+80 MHz this isn't really 965 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 966 * no way to cover 80+80 MHz or more complex restrictions. 967 * Note that such restrictions also need to be advertised to 968 * userspace, for example for P2P channel selection. 969 */ 970 971 if (width > 20) 972 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 973 974 /* 5 and 10 MHz are only defined for the OFDM PHY */ 975 if (width < 20) 976 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 977 978 979 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1, 980 width, prohibited_flags)) 981 return false; 982 983 if (!chandef->center_freq2) 984 return true; 985 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, 986 width, prohibited_flags); 987 } 988 EXPORT_SYMBOL(cfg80211_chandef_usable); 989 990 /* 991 * Check if the channel can be used under permissive conditions mandated by 992 * some regulatory bodies, i.e., the channel is marked with 993 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface 994 * associated to an AP on the same channel or on the same UNII band 995 * (assuming that the AP is an authorized master). 996 * In addition allow operation on a channel on which indoor operation is 997 * allowed, iff we are currently operating in an indoor environment. 998 */ 999 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 1000 enum nl80211_iftype iftype, 1001 struct ieee80211_channel *chan) 1002 { 1003 struct wireless_dev *wdev; 1004 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1005 1006 ASSERT_RTNL(); 1007 1008 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || 1009 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 1010 return false; 1011 1012 /* only valid for GO and TDLS off-channel (station/p2p-CL) */ 1013 if (iftype != NL80211_IFTYPE_P2P_GO && 1014 iftype != NL80211_IFTYPE_STATION && 1015 iftype != NL80211_IFTYPE_P2P_CLIENT) 1016 return false; 1017 1018 if (regulatory_indoor_allowed() && 1019 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1020 return true; 1021 1022 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) 1023 return false; 1024 1025 /* 1026 * Generally, it is possible to rely on another device/driver to allow 1027 * the IR concurrent relaxation, however, since the device can further 1028 * enforce the relaxation (by doing a similar verifications as this), 1029 * and thus fail the GO instantiation, consider only the interfaces of 1030 * the current registered device. 1031 */ 1032 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 1033 struct ieee80211_channel *other_chan = NULL; 1034 int r1, r2; 1035 1036 wdev_lock(wdev); 1037 if (wdev->iftype == NL80211_IFTYPE_STATION && 1038 wdev->current_bss) 1039 other_chan = wdev->current_bss->pub.channel; 1040 1041 /* 1042 * If a GO already operates on the same GO_CONCURRENT channel, 1043 * this one (maybe the same one) can beacon as well. We allow 1044 * the operation even if the station we relied on with 1045 * GO_CONCURRENT is disconnected now. But then we must make sure 1046 * we're not outdoor on an indoor-only channel. 1047 */ 1048 if (iftype == NL80211_IFTYPE_P2P_GO && 1049 wdev->iftype == NL80211_IFTYPE_P2P_GO && 1050 wdev->beacon_interval && 1051 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1052 other_chan = wdev->chandef.chan; 1053 wdev_unlock(wdev); 1054 1055 if (!other_chan) 1056 continue; 1057 1058 if (chan == other_chan) 1059 return true; 1060 1061 if (chan->band != NL80211_BAND_5GHZ && 1062 chan->band != NL80211_BAND_6GHZ) 1063 continue; 1064 1065 r1 = cfg80211_get_unii(chan->center_freq); 1066 r2 = cfg80211_get_unii(other_chan->center_freq); 1067 1068 if (r1 != -EINVAL && r1 == r2) { 1069 /* 1070 * At some locations channels 149-165 are considered a 1071 * bundle, but at other locations, e.g., Indonesia, 1072 * channels 149-161 are considered a bundle while 1073 * channel 165 is left out and considered to be in a 1074 * different bundle. Thus, in case that there is a 1075 * station interface connected to an AP on channel 165, 1076 * it is assumed that channels 149-161 are allowed for 1077 * GO operations. However, having a station interface 1078 * connected to an AP on channels 149-161, does not 1079 * allow GO operation on channel 165. 1080 */ 1081 if (chan->center_freq == 5825 && 1082 other_chan->center_freq != 5825) 1083 continue; 1084 return true; 1085 } 1086 } 1087 1088 return false; 1089 } 1090 1091 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, 1092 struct cfg80211_chan_def *chandef, 1093 enum nl80211_iftype iftype, 1094 bool check_no_ir) 1095 { 1096 bool res; 1097 u32 prohibited_flags = IEEE80211_CHAN_DISABLED | 1098 IEEE80211_CHAN_RADAR; 1099 1100 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 1101 1102 if (check_no_ir) 1103 prohibited_flags |= IEEE80211_CHAN_NO_IR; 1104 1105 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && 1106 cfg80211_chandef_dfs_available(wiphy, chandef)) { 1107 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 1108 prohibited_flags = IEEE80211_CHAN_DISABLED; 1109 } 1110 1111 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); 1112 1113 trace_cfg80211_return_bool(res); 1114 return res; 1115 } 1116 1117 bool cfg80211_reg_can_beacon(struct wiphy *wiphy, 1118 struct cfg80211_chan_def *chandef, 1119 enum nl80211_iftype iftype) 1120 { 1121 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); 1122 } 1123 EXPORT_SYMBOL(cfg80211_reg_can_beacon); 1124 1125 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, 1126 struct cfg80211_chan_def *chandef, 1127 enum nl80211_iftype iftype) 1128 { 1129 bool check_no_ir; 1130 1131 ASSERT_RTNL(); 1132 1133 /* 1134 * Under certain conditions suggested by some regulatory bodies a 1135 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag 1136 * only if such relaxations are not enabled and the conditions are not 1137 * met. 1138 */ 1139 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, 1140 chandef->chan); 1141 1142 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 1143 } 1144 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); 1145 1146 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 1147 struct cfg80211_chan_def *chandef) 1148 { 1149 if (!rdev->ops->set_monitor_channel) 1150 return -EOPNOTSUPP; 1151 if (!cfg80211_has_monitors_only(rdev)) 1152 return -EBUSY; 1153 1154 return rdev_set_monitor_channel(rdev, chandef); 1155 } 1156 1157 void 1158 cfg80211_get_chan_state(struct wireless_dev *wdev, 1159 struct ieee80211_channel **chan, 1160 enum cfg80211_chan_mode *chanmode, 1161 u8 *radar_detect) 1162 { 1163 int ret; 1164 1165 *chan = NULL; 1166 *chanmode = CHAN_MODE_UNDEFINED; 1167 1168 ASSERT_WDEV_LOCK(wdev); 1169 1170 if (wdev->netdev && !netif_running(wdev->netdev)) 1171 return; 1172 1173 switch (wdev->iftype) { 1174 case NL80211_IFTYPE_ADHOC: 1175 if (wdev->current_bss) { 1176 *chan = wdev->current_bss->pub.channel; 1177 *chanmode = (wdev->ibss_fixed && 1178 !wdev->ibss_dfs_possible) 1179 ? CHAN_MODE_SHARED 1180 : CHAN_MODE_EXCLUSIVE; 1181 1182 /* consider worst-case - IBSS can try to return to the 1183 * original user-specified channel as creator */ 1184 if (wdev->ibss_dfs_possible) 1185 *radar_detect |= BIT(wdev->chandef.width); 1186 return; 1187 } 1188 break; 1189 case NL80211_IFTYPE_STATION: 1190 case NL80211_IFTYPE_P2P_CLIENT: 1191 if (wdev->current_bss) { 1192 *chan = wdev->current_bss->pub.channel; 1193 *chanmode = CHAN_MODE_SHARED; 1194 return; 1195 } 1196 break; 1197 case NL80211_IFTYPE_AP: 1198 case NL80211_IFTYPE_P2P_GO: 1199 if (wdev->cac_started) { 1200 *chan = wdev->chandef.chan; 1201 *chanmode = CHAN_MODE_SHARED; 1202 *radar_detect |= BIT(wdev->chandef.width); 1203 } else if (wdev->beacon_interval) { 1204 *chan = wdev->chandef.chan; 1205 *chanmode = CHAN_MODE_SHARED; 1206 1207 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 1208 &wdev->chandef, 1209 wdev->iftype); 1210 WARN_ON(ret < 0); 1211 if (ret > 0) 1212 *radar_detect |= BIT(wdev->chandef.width); 1213 } 1214 return; 1215 case NL80211_IFTYPE_MESH_POINT: 1216 if (wdev->mesh_id_len) { 1217 *chan = wdev->chandef.chan; 1218 *chanmode = CHAN_MODE_SHARED; 1219 1220 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 1221 &wdev->chandef, 1222 wdev->iftype); 1223 WARN_ON(ret < 0); 1224 if (ret > 0) 1225 *radar_detect |= BIT(wdev->chandef.width); 1226 } 1227 return; 1228 case NL80211_IFTYPE_OCB: 1229 if (wdev->chandef.chan) { 1230 *chan = wdev->chandef.chan; 1231 *chanmode = CHAN_MODE_SHARED; 1232 return; 1233 } 1234 break; 1235 case NL80211_IFTYPE_MONITOR: 1236 case NL80211_IFTYPE_AP_VLAN: 1237 case NL80211_IFTYPE_WDS: 1238 case NL80211_IFTYPE_P2P_DEVICE: 1239 case NL80211_IFTYPE_NAN: 1240 /* these interface types don't really have a channel */ 1241 return; 1242 case NL80211_IFTYPE_UNSPECIFIED: 1243 case NUM_NL80211_IFTYPES: 1244 WARN_ON(1); 1245 } 1246 } 1247