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 cf_offset, 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 cf_offset = width / 2 - 10; 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; 583 584 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 585 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 586 587 /* 588 * Check entire range of channels for the bandwidth. 589 * If any channel in between is disabled or has not 590 * had gone through CAC return false 591 */ 592 for (freq = start_freq; freq <= end_freq; freq += 20) { 593 c = ieee80211_get_channel(wiphy, freq); 594 if (!c) 595 return false; 596 597 if (c->flags & IEEE80211_CHAN_DISABLED) 598 return false; 599 600 if ((c->flags & IEEE80211_CHAN_RADAR) && 601 (c->dfs_state != NL80211_DFS_AVAILABLE)) 602 return false; 603 } 604 605 return true; 606 } 607 608 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 609 const struct cfg80211_chan_def *chandef) 610 { 611 int width; 612 int r; 613 614 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 615 return false; 616 617 width = cfg80211_chandef_get_width(chandef); 618 if (width < 0) 619 return false; 620 621 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1, 622 width); 623 624 /* If any of channels unavailable for cf1 just return */ 625 if (!r) 626 return r; 627 628 switch (chandef->width) { 629 case NL80211_CHAN_WIDTH_80P80: 630 WARN_ON(!chandef->center_freq2); 631 r = cfg80211_get_chans_dfs_available(wiphy, 632 chandef->center_freq2, 633 width); 634 break; 635 default: 636 WARN_ON(chandef->center_freq2); 637 break; 638 } 639 640 return r; 641 } 642 643 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, 644 u32 center_freq, 645 u32 bandwidth) 646 { 647 struct ieee80211_channel *c; 648 u32 start_freq, end_freq, freq; 649 unsigned int dfs_cac_ms = 0; 650 651 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 652 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 653 654 for (freq = start_freq; freq <= end_freq; freq += 20) { 655 c = ieee80211_get_channel(wiphy, freq); 656 if (!c) 657 return 0; 658 659 if (c->flags & IEEE80211_CHAN_DISABLED) 660 return 0; 661 662 if (!(c->flags & IEEE80211_CHAN_RADAR)) 663 continue; 664 665 if (c->dfs_cac_ms > dfs_cac_ms) 666 dfs_cac_ms = c->dfs_cac_ms; 667 } 668 669 return dfs_cac_ms; 670 } 671 672 unsigned int 673 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 674 const struct cfg80211_chan_def *chandef) 675 { 676 int width; 677 unsigned int t1 = 0, t2 = 0; 678 679 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 680 return 0; 681 682 width = cfg80211_chandef_get_width(chandef); 683 if (width < 0) 684 return 0; 685 686 t1 = cfg80211_get_chans_dfs_cac_time(wiphy, 687 chandef->center_freq1, 688 width); 689 690 if (!chandef->center_freq2) 691 return t1; 692 693 t2 = cfg80211_get_chans_dfs_cac_time(wiphy, 694 chandef->center_freq2, 695 width); 696 697 return max(t1, t2); 698 } 699 700 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, 701 u32 center_freq, u32 bandwidth, 702 u32 prohibited_flags) 703 { 704 struct ieee80211_channel *c; 705 u32 freq, start_freq, end_freq; 706 707 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 708 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 709 710 for (freq = start_freq; freq <= end_freq; freq += 20) { 711 c = ieee80211_get_channel(wiphy, freq); 712 if (!c || c->flags & prohibited_flags) 713 return false; 714 } 715 716 return true; 717 } 718 719 bool cfg80211_chandef_usable(struct wiphy *wiphy, 720 const struct cfg80211_chan_def *chandef, 721 u32 prohibited_flags) 722 { 723 struct ieee80211_sta_ht_cap *ht_cap; 724 struct ieee80211_sta_vht_cap *vht_cap; 725 u32 width, control_freq, cap; 726 727 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 728 return false; 729 730 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 731 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 732 733 control_freq = chandef->chan->center_freq; 734 735 switch (chandef->width) { 736 case NL80211_CHAN_WIDTH_5: 737 width = 5; 738 break; 739 case NL80211_CHAN_WIDTH_10: 740 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 741 width = 10; 742 break; 743 case NL80211_CHAN_WIDTH_20: 744 if (!ht_cap->ht_supported) 745 return false; 746 case NL80211_CHAN_WIDTH_20_NOHT: 747 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 748 width = 20; 749 break; 750 case NL80211_CHAN_WIDTH_40: 751 width = 40; 752 if (!ht_cap->ht_supported) 753 return false; 754 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 755 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 756 return false; 757 if (chandef->center_freq1 < control_freq && 758 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 759 return false; 760 if (chandef->center_freq1 > control_freq && 761 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 762 return false; 763 break; 764 case NL80211_CHAN_WIDTH_80P80: 765 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 766 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 767 return false; 768 case NL80211_CHAN_WIDTH_80: 769 if (!vht_cap->vht_supported) 770 return false; 771 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 772 width = 80; 773 break; 774 case NL80211_CHAN_WIDTH_160: 775 if (!vht_cap->vht_supported) 776 return false; 777 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 778 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 779 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 780 return false; 781 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 782 width = 160; 783 break; 784 default: 785 WARN_ON_ONCE(1); 786 return false; 787 } 788 789 /* 790 * TODO: What if there are only certain 80/160/80+80 MHz channels 791 * allowed by the driver, or only certain combinations? 792 * For 40 MHz the driver can set the NO_HT40 flags, but for 793 * 80/160 MHz and in particular 80+80 MHz this isn't really 794 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 795 * no way to cover 80+80 MHz or more complex restrictions. 796 * Note that such restrictions also need to be advertised to 797 * userspace, for example for P2P channel selection. 798 */ 799 800 if (width > 20) 801 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 802 803 /* 5 and 10 MHz are only defined for the OFDM PHY */ 804 if (width < 20) 805 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 806 807 808 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1, 809 width, prohibited_flags)) 810 return false; 811 812 if (!chandef->center_freq2) 813 return true; 814 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, 815 width, prohibited_flags); 816 } 817 EXPORT_SYMBOL(cfg80211_chandef_usable); 818 819 /* 820 * Check if the channel can be used under permissive conditions mandated by 821 * some regulatory bodies, i.e., the channel is marked with 822 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface 823 * associated to an AP on the same channel or on the same UNII band 824 * (assuming that the AP is an authorized master). 825 * In addition allow operation on a channel on which indoor operation is 826 * allowed, iff we are currently operating in an indoor environment. 827 */ 828 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 829 enum nl80211_iftype iftype, 830 struct ieee80211_channel *chan) 831 { 832 struct wireless_dev *wdev; 833 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 834 835 ASSERT_RTNL(); 836 837 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || 838 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 839 return false; 840 841 /* only valid for GO and TDLS off-channel (station/p2p-CL) */ 842 if (iftype != NL80211_IFTYPE_P2P_GO && 843 iftype != NL80211_IFTYPE_STATION && 844 iftype != NL80211_IFTYPE_P2P_CLIENT) 845 return false; 846 847 if (regulatory_indoor_allowed() && 848 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 849 return true; 850 851 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) 852 return false; 853 854 /* 855 * Generally, it is possible to rely on another device/driver to allow 856 * the IR concurrent relaxation, however, since the device can further 857 * enforce the relaxation (by doing a similar verifications as this), 858 * and thus fail the GO instantiation, consider only the interfaces of 859 * the current registered device. 860 */ 861 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 862 struct ieee80211_channel *other_chan = NULL; 863 int r1, r2; 864 865 wdev_lock(wdev); 866 if (wdev->iftype == NL80211_IFTYPE_STATION && 867 wdev->current_bss) 868 other_chan = wdev->current_bss->pub.channel; 869 870 /* 871 * If a GO already operates on the same GO_CONCURRENT channel, 872 * this one (maybe the same one) can beacon as well. We allow 873 * the operation even if the station we relied on with 874 * GO_CONCURRENT is disconnected now. But then we must make sure 875 * we're not outdoor on an indoor-only channel. 876 */ 877 if (iftype == NL80211_IFTYPE_P2P_GO && 878 wdev->iftype == NL80211_IFTYPE_P2P_GO && 879 wdev->beacon_interval && 880 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 881 other_chan = wdev->chandef.chan; 882 wdev_unlock(wdev); 883 884 if (!other_chan) 885 continue; 886 887 if (chan == other_chan) 888 return true; 889 890 if (chan->band != NL80211_BAND_5GHZ) 891 continue; 892 893 r1 = cfg80211_get_unii(chan->center_freq); 894 r2 = cfg80211_get_unii(other_chan->center_freq); 895 896 if (r1 != -EINVAL && r1 == r2) { 897 /* 898 * At some locations channels 149-165 are considered a 899 * bundle, but at other locations, e.g., Indonesia, 900 * channels 149-161 are considered a bundle while 901 * channel 165 is left out and considered to be in a 902 * different bundle. Thus, in case that there is a 903 * station interface connected to an AP on channel 165, 904 * it is assumed that channels 149-161 are allowed for 905 * GO operations. However, having a station interface 906 * connected to an AP on channels 149-161, does not 907 * allow GO operation on channel 165. 908 */ 909 if (chan->center_freq == 5825 && 910 other_chan->center_freq != 5825) 911 continue; 912 return true; 913 } 914 } 915 916 return false; 917 } 918 919 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, 920 struct cfg80211_chan_def *chandef, 921 enum nl80211_iftype iftype, 922 bool check_no_ir) 923 { 924 bool res; 925 u32 prohibited_flags = IEEE80211_CHAN_DISABLED | 926 IEEE80211_CHAN_RADAR; 927 928 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 929 930 if (check_no_ir) 931 prohibited_flags |= IEEE80211_CHAN_NO_IR; 932 933 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && 934 cfg80211_chandef_dfs_available(wiphy, chandef)) { 935 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 936 prohibited_flags = IEEE80211_CHAN_DISABLED; 937 } 938 939 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); 940 941 trace_cfg80211_return_bool(res); 942 return res; 943 } 944 945 bool cfg80211_reg_can_beacon(struct wiphy *wiphy, 946 struct cfg80211_chan_def *chandef, 947 enum nl80211_iftype iftype) 948 { 949 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); 950 } 951 EXPORT_SYMBOL(cfg80211_reg_can_beacon); 952 953 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, 954 struct cfg80211_chan_def *chandef, 955 enum nl80211_iftype iftype) 956 { 957 bool check_no_ir; 958 959 ASSERT_RTNL(); 960 961 /* 962 * Under certain conditions suggested by some regulatory bodies a 963 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag 964 * only if such relaxations are not enabled and the conditions are not 965 * met. 966 */ 967 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, 968 chandef->chan); 969 970 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 971 } 972 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); 973 974 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 975 struct cfg80211_chan_def *chandef) 976 { 977 if (!rdev->ops->set_monitor_channel) 978 return -EOPNOTSUPP; 979 if (!cfg80211_has_monitors_only(rdev)) 980 return -EBUSY; 981 982 return rdev_set_monitor_channel(rdev, chandef); 983 } 984 985 void 986 cfg80211_get_chan_state(struct wireless_dev *wdev, 987 struct ieee80211_channel **chan, 988 enum cfg80211_chan_mode *chanmode, 989 u8 *radar_detect) 990 { 991 int ret; 992 993 *chan = NULL; 994 *chanmode = CHAN_MODE_UNDEFINED; 995 996 ASSERT_WDEV_LOCK(wdev); 997 998 if (wdev->netdev && !netif_running(wdev->netdev)) 999 return; 1000 1001 switch (wdev->iftype) { 1002 case NL80211_IFTYPE_ADHOC: 1003 if (wdev->current_bss) { 1004 *chan = wdev->current_bss->pub.channel; 1005 *chanmode = (wdev->ibss_fixed && 1006 !wdev->ibss_dfs_possible) 1007 ? CHAN_MODE_SHARED 1008 : CHAN_MODE_EXCLUSIVE; 1009 1010 /* consider worst-case - IBSS can try to return to the 1011 * original user-specified channel as creator */ 1012 if (wdev->ibss_dfs_possible) 1013 *radar_detect |= BIT(wdev->chandef.width); 1014 return; 1015 } 1016 break; 1017 case NL80211_IFTYPE_STATION: 1018 case NL80211_IFTYPE_P2P_CLIENT: 1019 if (wdev->current_bss) { 1020 *chan = wdev->current_bss->pub.channel; 1021 *chanmode = CHAN_MODE_SHARED; 1022 return; 1023 } 1024 break; 1025 case NL80211_IFTYPE_AP: 1026 case NL80211_IFTYPE_P2P_GO: 1027 if (wdev->cac_started) { 1028 *chan = wdev->chandef.chan; 1029 *chanmode = CHAN_MODE_SHARED; 1030 *radar_detect |= BIT(wdev->chandef.width); 1031 } else if (wdev->beacon_interval) { 1032 *chan = wdev->chandef.chan; 1033 *chanmode = CHAN_MODE_SHARED; 1034 1035 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 1036 &wdev->chandef, 1037 wdev->iftype); 1038 WARN_ON(ret < 0); 1039 if (ret > 0) 1040 *radar_detect |= BIT(wdev->chandef.width); 1041 } 1042 return; 1043 case NL80211_IFTYPE_MESH_POINT: 1044 if (wdev->mesh_id_len) { 1045 *chan = wdev->chandef.chan; 1046 *chanmode = CHAN_MODE_SHARED; 1047 1048 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 1049 &wdev->chandef, 1050 wdev->iftype); 1051 WARN_ON(ret < 0); 1052 if (ret > 0) 1053 *radar_detect |= BIT(wdev->chandef.width); 1054 } 1055 return; 1056 case NL80211_IFTYPE_OCB: 1057 if (wdev->chandef.chan) { 1058 *chan = wdev->chandef.chan; 1059 *chanmode = CHAN_MODE_SHARED; 1060 return; 1061 } 1062 break; 1063 case NL80211_IFTYPE_MONITOR: 1064 case NL80211_IFTYPE_AP_VLAN: 1065 case NL80211_IFTYPE_WDS: 1066 case NL80211_IFTYPE_P2P_DEVICE: 1067 case NL80211_IFTYPE_NAN: 1068 /* these interface types don't really have a channel */ 1069 return; 1070 case NL80211_IFTYPE_UNSPECIFIED: 1071 case NUM_NL80211_IFTYPES: 1072 WARN_ON(1); 1073 } 1074 } 1075