1 /* 2 * This file contains helper code to handle channel 3 * settings and keeping track of what is possible at 4 * any point in time. 5 * 6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 */ 9 10 #include <linux/export.h> 11 #include <net/cfg80211.h> 12 #include "core.h" 13 #include "rdev-ops.h" 14 15 void cfg80211_chandef_create(struct cfg80211_chan_def *chandef, 16 struct ieee80211_channel *chan, 17 enum nl80211_channel_type chan_type) 18 { 19 if (WARN_ON(!chan)) 20 return; 21 22 chandef->chan = chan; 23 chandef->center_freq2 = 0; 24 25 switch (chan_type) { 26 case NL80211_CHAN_NO_HT: 27 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 28 chandef->center_freq1 = chan->center_freq; 29 break; 30 case NL80211_CHAN_HT20: 31 chandef->width = NL80211_CHAN_WIDTH_20; 32 chandef->center_freq1 = chan->center_freq; 33 break; 34 case NL80211_CHAN_HT40PLUS: 35 chandef->width = NL80211_CHAN_WIDTH_40; 36 chandef->center_freq1 = chan->center_freq + 10; 37 break; 38 case NL80211_CHAN_HT40MINUS: 39 chandef->width = NL80211_CHAN_WIDTH_40; 40 chandef->center_freq1 = chan->center_freq - 10; 41 break; 42 default: 43 WARN_ON(1); 44 } 45 } 46 EXPORT_SYMBOL(cfg80211_chandef_create); 47 48 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) 49 { 50 u32 control_freq; 51 52 if (!chandef->chan) 53 return false; 54 55 control_freq = chandef->chan->center_freq; 56 57 switch (chandef->width) { 58 case NL80211_CHAN_WIDTH_5: 59 case NL80211_CHAN_WIDTH_10: 60 case NL80211_CHAN_WIDTH_20: 61 case NL80211_CHAN_WIDTH_20_NOHT: 62 if (chandef->center_freq1 != control_freq) 63 return false; 64 if (chandef->center_freq2) 65 return false; 66 break; 67 case NL80211_CHAN_WIDTH_40: 68 if (chandef->center_freq1 != control_freq + 10 && 69 chandef->center_freq1 != control_freq - 10) 70 return false; 71 if (chandef->center_freq2) 72 return false; 73 break; 74 case NL80211_CHAN_WIDTH_80P80: 75 if (chandef->center_freq1 != control_freq + 30 && 76 chandef->center_freq1 != control_freq + 10 && 77 chandef->center_freq1 != control_freq - 10 && 78 chandef->center_freq1 != control_freq - 30) 79 return false; 80 if (!chandef->center_freq2) 81 return false; 82 /* adjacent is not allowed -- that's a 160 MHz channel */ 83 if (chandef->center_freq1 - chandef->center_freq2 == 80 || 84 chandef->center_freq2 - chandef->center_freq1 == 80) 85 return false; 86 break; 87 case NL80211_CHAN_WIDTH_80: 88 if (chandef->center_freq1 != control_freq + 30 && 89 chandef->center_freq1 != control_freq + 10 && 90 chandef->center_freq1 != control_freq - 10 && 91 chandef->center_freq1 != control_freq - 30) 92 return false; 93 if (chandef->center_freq2) 94 return false; 95 break; 96 case NL80211_CHAN_WIDTH_160: 97 if (chandef->center_freq1 != control_freq + 70 && 98 chandef->center_freq1 != control_freq + 50 && 99 chandef->center_freq1 != control_freq + 30 && 100 chandef->center_freq1 != control_freq + 10 && 101 chandef->center_freq1 != control_freq - 10 && 102 chandef->center_freq1 != control_freq - 30 && 103 chandef->center_freq1 != control_freq - 50 && 104 chandef->center_freq1 != control_freq - 70) 105 return false; 106 if (chandef->center_freq2) 107 return false; 108 break; 109 default: 110 return false; 111 } 112 113 return true; 114 } 115 EXPORT_SYMBOL(cfg80211_chandef_valid); 116 117 static void chandef_primary_freqs(const struct cfg80211_chan_def *c, 118 u32 *pri40, u32 *pri80) 119 { 120 int tmp; 121 122 switch (c->width) { 123 case NL80211_CHAN_WIDTH_40: 124 *pri40 = c->center_freq1; 125 *pri80 = 0; 126 break; 127 case NL80211_CHAN_WIDTH_80: 128 case NL80211_CHAN_WIDTH_80P80: 129 *pri80 = c->center_freq1; 130 /* n_P20 */ 131 tmp = (30 + c->chan->center_freq - c->center_freq1)/20; 132 /* n_P40 */ 133 tmp /= 2; 134 /* freq_P40 */ 135 *pri40 = c->center_freq1 - 20 + 40 * tmp; 136 break; 137 case NL80211_CHAN_WIDTH_160: 138 /* n_P20 */ 139 tmp = (70 + c->chan->center_freq - c->center_freq1)/20; 140 /* n_P40 */ 141 tmp /= 2; 142 /* freq_P40 */ 143 *pri40 = c->center_freq1 - 60 + 40 * tmp; 144 /* n_P80 */ 145 tmp /= 2; 146 *pri80 = c->center_freq1 - 40 + 80 * tmp; 147 break; 148 default: 149 WARN_ON_ONCE(1); 150 } 151 } 152 153 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) 154 { 155 int width; 156 157 switch (c->width) { 158 case NL80211_CHAN_WIDTH_5: 159 width = 5; 160 break; 161 case NL80211_CHAN_WIDTH_10: 162 width = 10; 163 break; 164 case NL80211_CHAN_WIDTH_20: 165 case NL80211_CHAN_WIDTH_20_NOHT: 166 width = 20; 167 break; 168 case NL80211_CHAN_WIDTH_40: 169 width = 40; 170 break; 171 case NL80211_CHAN_WIDTH_80P80: 172 case NL80211_CHAN_WIDTH_80: 173 width = 80; 174 break; 175 case NL80211_CHAN_WIDTH_160: 176 width = 160; 177 break; 178 default: 179 WARN_ON_ONCE(1); 180 return -1; 181 } 182 return width; 183 } 184 185 const struct cfg80211_chan_def * 186 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, 187 const struct cfg80211_chan_def *c2) 188 { 189 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80; 190 191 /* If they are identical, return */ 192 if (cfg80211_chandef_identical(c1, c2)) 193 return c1; 194 195 /* otherwise, must have same control channel */ 196 if (c1->chan != c2->chan) 197 return NULL; 198 199 /* 200 * If they have the same width, but aren't identical, 201 * then they can't be compatible. 202 */ 203 if (c1->width == c2->width) 204 return NULL; 205 206 /* 207 * can't be compatible if one of them is 5 or 10 MHz, 208 * but they don't have the same width. 209 */ 210 if (c1->width == NL80211_CHAN_WIDTH_5 || 211 c1->width == NL80211_CHAN_WIDTH_10 || 212 c2->width == NL80211_CHAN_WIDTH_5 || 213 c2->width == NL80211_CHAN_WIDTH_10) 214 return NULL; 215 216 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || 217 c1->width == NL80211_CHAN_WIDTH_20) 218 return c2; 219 220 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || 221 c2->width == NL80211_CHAN_WIDTH_20) 222 return c1; 223 224 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80); 225 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80); 226 227 if (c1_pri40 != c2_pri40) 228 return NULL; 229 230 WARN_ON(!c1_pri80 && !c2_pri80); 231 if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80) 232 return NULL; 233 234 if (c1->width > c2->width) 235 return c1; 236 return c2; 237 } 238 EXPORT_SYMBOL(cfg80211_chandef_compatible); 239 240 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, 241 u32 bandwidth, 242 enum nl80211_dfs_state dfs_state) 243 { 244 struct ieee80211_channel *c; 245 u32 freq; 246 247 for (freq = center_freq - bandwidth/2 + 10; 248 freq <= center_freq + bandwidth/2 - 10; 249 freq += 20) { 250 c = ieee80211_get_channel(wiphy, freq); 251 if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) 252 continue; 253 254 c->dfs_state = dfs_state; 255 c->dfs_state_entered = jiffies; 256 } 257 } 258 259 void cfg80211_set_dfs_state(struct wiphy *wiphy, 260 const struct cfg80211_chan_def *chandef, 261 enum nl80211_dfs_state dfs_state) 262 { 263 int width; 264 265 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 266 return; 267 268 width = cfg80211_chandef_get_width(chandef); 269 if (width < 0) 270 return; 271 272 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1, 273 width, dfs_state); 274 275 if (!chandef->center_freq2) 276 return; 277 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2, 278 width, dfs_state); 279 } 280 281 static u32 cfg80211_get_start_freq(u32 center_freq, 282 u32 bandwidth) 283 { 284 u32 start_freq; 285 286 if (bandwidth <= 20) 287 start_freq = center_freq; 288 else 289 start_freq = center_freq - bandwidth/2 + 10; 290 291 return start_freq; 292 } 293 294 static u32 cfg80211_get_end_freq(u32 center_freq, 295 u32 bandwidth) 296 { 297 u32 end_freq; 298 299 if (bandwidth <= 20) 300 end_freq = center_freq; 301 else 302 end_freq = center_freq + bandwidth/2 - 10; 303 304 return end_freq; 305 } 306 307 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, 308 u32 center_freq, 309 u32 bandwidth) 310 { 311 struct ieee80211_channel *c; 312 u32 freq, start_freq, end_freq; 313 314 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 315 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 316 317 for (freq = start_freq; freq <= end_freq; freq += 20) { 318 c = ieee80211_get_channel(wiphy, freq); 319 if (!c) 320 return -EINVAL; 321 322 if (c->flags & IEEE80211_CHAN_RADAR) 323 return 1; 324 } 325 return 0; 326 } 327 328 329 int cfg80211_chandef_dfs_required(struct wiphy *wiphy, 330 const struct cfg80211_chan_def *chandef, 331 enum nl80211_iftype iftype) 332 { 333 int width; 334 int ret; 335 336 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 337 return -EINVAL; 338 339 switch (iftype) { 340 case NL80211_IFTYPE_ADHOC: 341 case NL80211_IFTYPE_AP: 342 case NL80211_IFTYPE_P2P_GO: 343 case NL80211_IFTYPE_MESH_POINT: 344 width = cfg80211_chandef_get_width(chandef); 345 if (width < 0) 346 return -EINVAL; 347 348 ret = cfg80211_get_chans_dfs_required(wiphy, 349 chandef->center_freq1, 350 width); 351 if (ret < 0) 352 return ret; 353 else if (ret > 0) 354 return BIT(chandef->width); 355 356 if (!chandef->center_freq2) 357 return 0; 358 359 ret = cfg80211_get_chans_dfs_required(wiphy, 360 chandef->center_freq2, 361 width); 362 if (ret < 0) 363 return ret; 364 else if (ret > 0) 365 return BIT(chandef->width); 366 367 break; 368 case NL80211_IFTYPE_STATION: 369 case NL80211_IFTYPE_OCB: 370 case NL80211_IFTYPE_P2P_CLIENT: 371 case NL80211_IFTYPE_MONITOR: 372 case NL80211_IFTYPE_AP_VLAN: 373 case NL80211_IFTYPE_WDS: 374 case NL80211_IFTYPE_P2P_DEVICE: 375 case NL80211_IFTYPE_NAN: 376 break; 377 case NL80211_IFTYPE_UNSPECIFIED: 378 case NUM_NL80211_IFTYPES: 379 WARN_ON(1); 380 } 381 382 return 0; 383 } 384 EXPORT_SYMBOL(cfg80211_chandef_dfs_required); 385 386 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, 387 u32 center_freq, 388 u32 bandwidth) 389 { 390 struct ieee80211_channel *c; 391 u32 freq, start_freq, end_freq; 392 int count = 0; 393 394 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 395 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 396 397 /* 398 * Check entire range of channels for the bandwidth. 399 * Check all channels are DFS channels (DFS_USABLE or 400 * DFS_AVAILABLE). Return number of usable channels 401 * (require CAC). Allow DFS and non-DFS channel mix. 402 */ 403 for (freq = start_freq; freq <= end_freq; freq += 20) { 404 c = ieee80211_get_channel(wiphy, freq); 405 if (!c) 406 return -EINVAL; 407 408 if (c->flags & IEEE80211_CHAN_DISABLED) 409 return -EINVAL; 410 411 if (c->flags & IEEE80211_CHAN_RADAR) { 412 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) 413 return -EINVAL; 414 415 if (c->dfs_state == NL80211_DFS_USABLE) 416 count++; 417 } 418 } 419 420 return count; 421 } 422 423 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, 424 const struct cfg80211_chan_def *chandef) 425 { 426 int width; 427 int r1, r2 = 0; 428 429 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 430 return false; 431 432 width = cfg80211_chandef_get_width(chandef); 433 if (width < 0) 434 return false; 435 436 r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1, 437 width); 438 439 if (r1 < 0) 440 return false; 441 442 switch (chandef->width) { 443 case NL80211_CHAN_WIDTH_80P80: 444 WARN_ON(!chandef->center_freq2); 445 r2 = cfg80211_get_chans_dfs_usable(wiphy, 446 chandef->center_freq2, 447 width); 448 if (r2 < 0) 449 return false; 450 break; 451 default: 452 WARN_ON(chandef->center_freq2); 453 break; 454 } 455 456 return (r1 + r2 > 0); 457 } 458 459 /* 460 * Checks if center frequency of chan falls with in the bandwidth 461 * range of chandef. 462 */ 463 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef, 464 struct ieee80211_channel *chan) 465 { 466 int width; 467 u32 freq; 468 469 if (chandef->chan->center_freq == chan->center_freq) 470 return true; 471 472 width = cfg80211_chandef_get_width(chandef); 473 if (width <= 20) 474 return false; 475 476 for (freq = chandef->center_freq1 - width / 2 + 10; 477 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) { 478 if (chan->center_freq == freq) 479 return true; 480 } 481 482 if (!chandef->center_freq2) 483 return false; 484 485 for (freq = chandef->center_freq2 - width / 2 + 10; 486 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) { 487 if (chan->center_freq == freq) 488 return true; 489 } 490 491 return false; 492 } 493 494 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) 495 { 496 bool active = false; 497 498 ASSERT_WDEV_LOCK(wdev); 499 500 if (!wdev->chandef.chan) 501 return false; 502 503 switch (wdev->iftype) { 504 case NL80211_IFTYPE_AP: 505 case NL80211_IFTYPE_P2P_GO: 506 active = wdev->beacon_interval != 0; 507 break; 508 case NL80211_IFTYPE_ADHOC: 509 active = wdev->ssid_len != 0; 510 break; 511 case NL80211_IFTYPE_MESH_POINT: 512 active = wdev->mesh_id_len != 0; 513 break; 514 case NL80211_IFTYPE_STATION: 515 case NL80211_IFTYPE_OCB: 516 case NL80211_IFTYPE_P2P_CLIENT: 517 case NL80211_IFTYPE_MONITOR: 518 case NL80211_IFTYPE_AP_VLAN: 519 case NL80211_IFTYPE_WDS: 520 case NL80211_IFTYPE_P2P_DEVICE: 521 /* Can NAN type be considered as beaconing interface? */ 522 case NL80211_IFTYPE_NAN: 523 break; 524 case NL80211_IFTYPE_UNSPECIFIED: 525 case NUM_NL80211_IFTYPES: 526 WARN_ON(1); 527 } 528 529 return active; 530 } 531 532 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy, 533 struct ieee80211_channel *chan) 534 { 535 struct wireless_dev *wdev; 536 537 list_for_each_entry(wdev, &wiphy->wdev_list, list) { 538 wdev_lock(wdev); 539 if (!cfg80211_beaconing_iface_active(wdev)) { 540 wdev_unlock(wdev); 541 continue; 542 } 543 544 if (cfg80211_is_sub_chan(&wdev->chandef, chan)) { 545 wdev_unlock(wdev); 546 return true; 547 } 548 wdev_unlock(wdev); 549 } 550 551 return false; 552 } 553 554 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, 555 struct ieee80211_channel *chan) 556 { 557 struct cfg80211_registered_device *rdev; 558 559 ASSERT_RTNL(); 560 561 if (!(chan->flags & IEEE80211_CHAN_RADAR)) 562 return false; 563 564 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 565 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy)) 566 continue; 567 568 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan)) 569 return true; 570 } 571 572 return false; 573 } 574 575 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, 576 u32 center_freq, 577 u32 bandwidth) 578 { 579 struct ieee80211_channel *c; 580 u32 freq, start_freq, end_freq; 581 582 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 583 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 584 585 /* 586 * Check entire range of channels for the bandwidth. 587 * If any channel in between is disabled or has not 588 * had gone through CAC return false 589 */ 590 for (freq = start_freq; freq <= end_freq; freq += 20) { 591 c = ieee80211_get_channel(wiphy, freq); 592 if (!c) 593 return false; 594 595 if (c->flags & IEEE80211_CHAN_DISABLED) 596 return false; 597 598 if ((c->flags & IEEE80211_CHAN_RADAR) && 599 (c->dfs_state != NL80211_DFS_AVAILABLE)) 600 return false; 601 } 602 603 return true; 604 } 605 606 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 607 const struct cfg80211_chan_def *chandef) 608 { 609 int width; 610 int r; 611 612 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 613 return false; 614 615 width = cfg80211_chandef_get_width(chandef); 616 if (width < 0) 617 return false; 618 619 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1, 620 width); 621 622 /* If any of channels unavailable for cf1 just return */ 623 if (!r) 624 return r; 625 626 switch (chandef->width) { 627 case NL80211_CHAN_WIDTH_80P80: 628 WARN_ON(!chandef->center_freq2); 629 r = cfg80211_get_chans_dfs_available(wiphy, 630 chandef->center_freq2, 631 width); 632 break; 633 default: 634 WARN_ON(chandef->center_freq2); 635 break; 636 } 637 638 return r; 639 } 640 641 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, 642 u32 center_freq, 643 u32 bandwidth) 644 { 645 struct ieee80211_channel *c; 646 u32 start_freq, end_freq, freq; 647 unsigned int dfs_cac_ms = 0; 648 649 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 650 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 651 652 for (freq = start_freq; freq <= end_freq; freq += 20) { 653 c = ieee80211_get_channel(wiphy, freq); 654 if (!c) 655 return 0; 656 657 if (c->flags & IEEE80211_CHAN_DISABLED) 658 return 0; 659 660 if (!(c->flags & IEEE80211_CHAN_RADAR)) 661 continue; 662 663 if (c->dfs_cac_ms > dfs_cac_ms) 664 dfs_cac_ms = c->dfs_cac_ms; 665 } 666 667 return dfs_cac_ms; 668 } 669 670 unsigned int 671 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 672 const struct cfg80211_chan_def *chandef) 673 { 674 int width; 675 unsigned int t1 = 0, t2 = 0; 676 677 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 678 return 0; 679 680 width = cfg80211_chandef_get_width(chandef); 681 if (width < 0) 682 return 0; 683 684 t1 = cfg80211_get_chans_dfs_cac_time(wiphy, 685 chandef->center_freq1, 686 width); 687 688 if (!chandef->center_freq2) 689 return t1; 690 691 t2 = cfg80211_get_chans_dfs_cac_time(wiphy, 692 chandef->center_freq2, 693 width); 694 695 return max(t1, t2); 696 } 697 698 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, 699 u32 center_freq, u32 bandwidth, 700 u32 prohibited_flags) 701 { 702 struct ieee80211_channel *c; 703 u32 freq, start_freq, end_freq; 704 705 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 706 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 707 708 for (freq = start_freq; freq <= end_freq; freq += 20) { 709 c = ieee80211_get_channel(wiphy, freq); 710 if (!c || c->flags & prohibited_flags) 711 return false; 712 } 713 714 return true; 715 } 716 717 bool cfg80211_chandef_usable(struct wiphy *wiphy, 718 const struct cfg80211_chan_def *chandef, 719 u32 prohibited_flags) 720 { 721 struct ieee80211_sta_ht_cap *ht_cap; 722 struct ieee80211_sta_vht_cap *vht_cap; 723 u32 width, control_freq, cap; 724 725 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 726 return false; 727 728 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 729 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 730 731 control_freq = chandef->chan->center_freq; 732 733 switch (chandef->width) { 734 case NL80211_CHAN_WIDTH_5: 735 width = 5; 736 break; 737 case NL80211_CHAN_WIDTH_10: 738 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 739 width = 10; 740 break; 741 case NL80211_CHAN_WIDTH_20: 742 if (!ht_cap->ht_supported) 743 return false; 744 case NL80211_CHAN_WIDTH_20_NOHT: 745 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 746 width = 20; 747 break; 748 case NL80211_CHAN_WIDTH_40: 749 width = 40; 750 if (!ht_cap->ht_supported) 751 return false; 752 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 753 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 754 return false; 755 if (chandef->center_freq1 < control_freq && 756 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 757 return false; 758 if (chandef->center_freq1 > control_freq && 759 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 760 return false; 761 break; 762 case NL80211_CHAN_WIDTH_80P80: 763 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 764 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 765 return false; 766 case NL80211_CHAN_WIDTH_80: 767 if (!vht_cap->vht_supported) 768 return false; 769 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 770 width = 80; 771 break; 772 case NL80211_CHAN_WIDTH_160: 773 if (!vht_cap->vht_supported) 774 return false; 775 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 776 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 777 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 778 return false; 779 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 780 width = 160; 781 break; 782 default: 783 WARN_ON_ONCE(1); 784 return false; 785 } 786 787 /* 788 * TODO: What if there are only certain 80/160/80+80 MHz channels 789 * allowed by the driver, or only certain combinations? 790 * For 40 MHz the driver can set the NO_HT40 flags, but for 791 * 80/160 MHz and in particular 80+80 MHz this isn't really 792 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 793 * no way to cover 80+80 MHz or more complex restrictions. 794 * Note that such restrictions also need to be advertised to 795 * userspace, for example for P2P channel selection. 796 */ 797 798 if (width > 20) 799 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 800 801 /* 5 and 10 MHz are only defined for the OFDM PHY */ 802 if (width < 20) 803 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 804 805 806 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1, 807 width, prohibited_flags)) 808 return false; 809 810 if (!chandef->center_freq2) 811 return true; 812 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, 813 width, prohibited_flags); 814 } 815 EXPORT_SYMBOL(cfg80211_chandef_usable); 816 817 /* 818 * Check if the channel can be used under permissive conditions mandated by 819 * some regulatory bodies, i.e., the channel is marked with 820 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface 821 * associated to an AP on the same channel or on the same UNII band 822 * (assuming that the AP is an authorized master). 823 * In addition allow operation on a channel on which indoor operation is 824 * allowed, iff we are currently operating in an indoor environment. 825 */ 826 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 827 enum nl80211_iftype iftype, 828 struct ieee80211_channel *chan) 829 { 830 struct wireless_dev *wdev; 831 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 832 833 ASSERT_RTNL(); 834 835 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || 836 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 837 return false; 838 839 /* only valid for GO and TDLS off-channel (station/p2p-CL) */ 840 if (iftype != NL80211_IFTYPE_P2P_GO && 841 iftype != NL80211_IFTYPE_STATION && 842 iftype != NL80211_IFTYPE_P2P_CLIENT) 843 return false; 844 845 if (regulatory_indoor_allowed() && 846 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 847 return true; 848 849 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) 850 return false; 851 852 /* 853 * Generally, it is possible to rely on another device/driver to allow 854 * the IR concurrent relaxation, however, since the device can further 855 * enforce the relaxation (by doing a similar verifications as this), 856 * and thus fail the GO instantiation, consider only the interfaces of 857 * the current registered device. 858 */ 859 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 860 struct ieee80211_channel *other_chan = NULL; 861 int r1, r2; 862 863 wdev_lock(wdev); 864 if (wdev->iftype == NL80211_IFTYPE_STATION && 865 wdev->current_bss) 866 other_chan = wdev->current_bss->pub.channel; 867 868 /* 869 * If a GO already operates on the same GO_CONCURRENT channel, 870 * this one (maybe the same one) can beacon as well. We allow 871 * the operation even if the station we relied on with 872 * GO_CONCURRENT is disconnected now. But then we must make sure 873 * we're not outdoor on an indoor-only channel. 874 */ 875 if (iftype == NL80211_IFTYPE_P2P_GO && 876 wdev->iftype == NL80211_IFTYPE_P2P_GO && 877 wdev->beacon_interval && 878 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 879 other_chan = wdev->chandef.chan; 880 wdev_unlock(wdev); 881 882 if (!other_chan) 883 continue; 884 885 if (chan == other_chan) 886 return true; 887 888 if (chan->band != NL80211_BAND_5GHZ) 889 continue; 890 891 r1 = cfg80211_get_unii(chan->center_freq); 892 r2 = cfg80211_get_unii(other_chan->center_freq); 893 894 if (r1 != -EINVAL && r1 == r2) { 895 /* 896 * At some locations channels 149-165 are considered a 897 * bundle, but at other locations, e.g., Indonesia, 898 * channels 149-161 are considered a bundle while 899 * channel 165 is left out and considered to be in a 900 * different bundle. Thus, in case that there is a 901 * station interface connected to an AP on channel 165, 902 * it is assumed that channels 149-161 are allowed for 903 * GO operations. However, having a station interface 904 * connected to an AP on channels 149-161, does not 905 * allow GO operation on channel 165. 906 */ 907 if (chan->center_freq == 5825 && 908 other_chan->center_freq != 5825) 909 continue; 910 return true; 911 } 912 } 913 914 return false; 915 } 916 917 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, 918 struct cfg80211_chan_def *chandef, 919 enum nl80211_iftype iftype, 920 bool check_no_ir) 921 { 922 bool res; 923 u32 prohibited_flags = IEEE80211_CHAN_DISABLED | 924 IEEE80211_CHAN_RADAR; 925 926 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 927 928 if (check_no_ir) 929 prohibited_flags |= IEEE80211_CHAN_NO_IR; 930 931 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && 932 cfg80211_chandef_dfs_available(wiphy, chandef)) { 933 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 934 prohibited_flags = IEEE80211_CHAN_DISABLED; 935 } 936 937 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); 938 939 trace_cfg80211_return_bool(res); 940 return res; 941 } 942 943 bool cfg80211_reg_can_beacon(struct wiphy *wiphy, 944 struct cfg80211_chan_def *chandef, 945 enum nl80211_iftype iftype) 946 { 947 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); 948 } 949 EXPORT_SYMBOL(cfg80211_reg_can_beacon); 950 951 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, 952 struct cfg80211_chan_def *chandef, 953 enum nl80211_iftype iftype) 954 { 955 bool check_no_ir; 956 957 ASSERT_RTNL(); 958 959 /* 960 * Under certain conditions suggested by some regulatory bodies a 961 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag 962 * only if such relaxations are not enabled and the conditions are not 963 * met. 964 */ 965 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, 966 chandef->chan); 967 968 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 969 } 970 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); 971 972 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 973 struct cfg80211_chan_def *chandef) 974 { 975 if (!rdev->ops->set_monitor_channel) 976 return -EOPNOTSUPP; 977 if (!cfg80211_has_monitors_only(rdev)) 978 return -EBUSY; 979 980 return rdev_set_monitor_channel(rdev, chandef); 981 } 982 983 void 984 cfg80211_get_chan_state(struct wireless_dev *wdev, 985 struct ieee80211_channel **chan, 986 enum cfg80211_chan_mode *chanmode, 987 u8 *radar_detect) 988 { 989 int ret; 990 991 *chan = NULL; 992 *chanmode = CHAN_MODE_UNDEFINED; 993 994 ASSERT_WDEV_LOCK(wdev); 995 996 if (wdev->netdev && !netif_running(wdev->netdev)) 997 return; 998 999 switch (wdev->iftype) { 1000 case NL80211_IFTYPE_ADHOC: 1001 if (wdev->current_bss) { 1002 *chan = wdev->current_bss->pub.channel; 1003 *chanmode = (wdev->ibss_fixed && 1004 !wdev->ibss_dfs_possible) 1005 ? CHAN_MODE_SHARED 1006 : CHAN_MODE_EXCLUSIVE; 1007 1008 /* consider worst-case - IBSS can try to return to the 1009 * original user-specified channel as creator */ 1010 if (wdev->ibss_dfs_possible) 1011 *radar_detect |= BIT(wdev->chandef.width); 1012 return; 1013 } 1014 break; 1015 case NL80211_IFTYPE_STATION: 1016 case NL80211_IFTYPE_P2P_CLIENT: 1017 if (wdev->current_bss) { 1018 *chan = wdev->current_bss->pub.channel; 1019 *chanmode = CHAN_MODE_SHARED; 1020 return; 1021 } 1022 break; 1023 case NL80211_IFTYPE_AP: 1024 case NL80211_IFTYPE_P2P_GO: 1025 if (wdev->cac_started) { 1026 *chan = wdev->chandef.chan; 1027 *chanmode = CHAN_MODE_SHARED; 1028 *radar_detect |= BIT(wdev->chandef.width); 1029 } else if (wdev->beacon_interval) { 1030 *chan = wdev->chandef.chan; 1031 *chanmode = CHAN_MODE_SHARED; 1032 1033 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 1034 &wdev->chandef, 1035 wdev->iftype); 1036 WARN_ON(ret < 0); 1037 if (ret > 0) 1038 *radar_detect |= BIT(wdev->chandef.width); 1039 } 1040 return; 1041 case NL80211_IFTYPE_MESH_POINT: 1042 if (wdev->mesh_id_len) { 1043 *chan = wdev->chandef.chan; 1044 *chanmode = CHAN_MODE_SHARED; 1045 1046 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 1047 &wdev->chandef, 1048 wdev->iftype); 1049 WARN_ON(ret < 0); 1050 if (ret > 0) 1051 *radar_detect |= BIT(wdev->chandef.width); 1052 } 1053 return; 1054 case NL80211_IFTYPE_OCB: 1055 if (wdev->chandef.chan) { 1056 *chan = wdev->chandef.chan; 1057 *chanmode = CHAN_MODE_SHARED; 1058 return; 1059 } 1060 break; 1061 case NL80211_IFTYPE_MONITOR: 1062 case NL80211_IFTYPE_AP_VLAN: 1063 case NL80211_IFTYPE_WDS: 1064 case NL80211_IFTYPE_P2P_DEVICE: 1065 case NL80211_IFTYPE_NAN: 1066 /* these interface types don't really have a channel */ 1067 return; 1068 case NL80211_IFTYPE_UNSPECIFIED: 1069 case NUM_NL80211_IFTYPES: 1070 WARN_ON(1); 1071 } 1072 } 1073