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