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 int *pri40, int *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_P2P_CLIENT: 370 case NL80211_IFTYPE_MONITOR: 371 case NL80211_IFTYPE_AP_VLAN: 372 case NL80211_IFTYPE_WDS: 373 case NL80211_IFTYPE_P2P_DEVICE: 374 break; 375 case NL80211_IFTYPE_UNSPECIFIED: 376 case NUM_NL80211_IFTYPES: 377 WARN_ON(1); 378 } 379 380 return 0; 381 } 382 EXPORT_SYMBOL(cfg80211_chandef_dfs_required); 383 384 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, 385 u32 center_freq, 386 u32 bandwidth) 387 { 388 struct ieee80211_channel *c; 389 u32 freq, start_freq, end_freq; 390 int count = 0; 391 392 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 393 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 394 395 /* 396 * Check entire range of channels for the bandwidth. 397 * Check all channels are DFS channels (DFS_USABLE or 398 * DFS_AVAILABLE). Return number of usable channels 399 * (require CAC). Allow DFS and non-DFS channel mix. 400 */ 401 for (freq = start_freq; freq <= end_freq; freq += 20) { 402 c = ieee80211_get_channel(wiphy, freq); 403 if (!c) 404 return -EINVAL; 405 406 if (c->flags & IEEE80211_CHAN_DISABLED) 407 return -EINVAL; 408 409 if (c->flags & IEEE80211_CHAN_RADAR) { 410 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) 411 return -EINVAL; 412 413 if (c->dfs_state == NL80211_DFS_USABLE) 414 count++; 415 } 416 } 417 418 return count; 419 } 420 421 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, 422 const struct cfg80211_chan_def *chandef) 423 { 424 int width; 425 int r1, r2 = 0; 426 427 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 428 return false; 429 430 width = cfg80211_chandef_get_width(chandef); 431 if (width < 0) 432 return false; 433 434 r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1, 435 width); 436 437 if (r1 < 0) 438 return false; 439 440 switch (chandef->width) { 441 case NL80211_CHAN_WIDTH_80P80: 442 WARN_ON(!chandef->center_freq2); 443 r2 = cfg80211_get_chans_dfs_usable(wiphy, 444 chandef->center_freq2, 445 width); 446 if (r2 < 0) 447 return false; 448 break; 449 default: 450 WARN_ON(chandef->center_freq2); 451 break; 452 } 453 454 return (r1 + r2 > 0); 455 } 456 457 458 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, 459 u32 center_freq, 460 u32 bandwidth) 461 { 462 struct ieee80211_channel *c; 463 u32 freq, start_freq, end_freq; 464 465 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 466 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 467 468 /* 469 * Check entire range of channels for the bandwidth. 470 * If any channel in between is disabled or has not 471 * had gone through CAC return false 472 */ 473 for (freq = start_freq; freq <= end_freq; freq += 20) { 474 c = ieee80211_get_channel(wiphy, freq); 475 if (!c) 476 return false; 477 478 if (c->flags & IEEE80211_CHAN_DISABLED) 479 return false; 480 481 if ((c->flags & IEEE80211_CHAN_RADAR) && 482 (c->dfs_state != NL80211_DFS_AVAILABLE)) 483 return false; 484 } 485 486 return true; 487 } 488 489 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 490 const struct cfg80211_chan_def *chandef) 491 { 492 int width; 493 int r; 494 495 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 496 return false; 497 498 width = cfg80211_chandef_get_width(chandef); 499 if (width < 0) 500 return false; 501 502 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1, 503 width); 504 505 /* If any of channels unavailable for cf1 just return */ 506 if (!r) 507 return r; 508 509 switch (chandef->width) { 510 case NL80211_CHAN_WIDTH_80P80: 511 WARN_ON(!chandef->center_freq2); 512 r = cfg80211_get_chans_dfs_available(wiphy, 513 chandef->center_freq2, 514 width); 515 default: 516 WARN_ON(chandef->center_freq2); 517 break; 518 } 519 520 return r; 521 } 522 523 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, 524 u32 center_freq, 525 u32 bandwidth) 526 { 527 struct ieee80211_channel *c; 528 u32 start_freq, end_freq, freq; 529 unsigned int dfs_cac_ms = 0; 530 531 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 532 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 533 534 for (freq = start_freq; freq <= end_freq; freq += 20) { 535 c = ieee80211_get_channel(wiphy, freq); 536 if (!c) 537 return 0; 538 539 if (c->flags & IEEE80211_CHAN_DISABLED) 540 return 0; 541 542 if (!(c->flags & IEEE80211_CHAN_RADAR)) 543 continue; 544 545 if (c->dfs_cac_ms > dfs_cac_ms) 546 dfs_cac_ms = c->dfs_cac_ms; 547 } 548 549 return dfs_cac_ms; 550 } 551 552 unsigned int 553 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 554 const struct cfg80211_chan_def *chandef) 555 { 556 int width; 557 unsigned int t1 = 0, t2 = 0; 558 559 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 560 return 0; 561 562 width = cfg80211_chandef_get_width(chandef); 563 if (width < 0) 564 return 0; 565 566 t1 = cfg80211_get_chans_dfs_cac_time(wiphy, 567 chandef->center_freq1, 568 width); 569 570 if (!chandef->center_freq2) 571 return t1; 572 573 t2 = cfg80211_get_chans_dfs_cac_time(wiphy, 574 chandef->center_freq2, 575 width); 576 577 return max(t1, t2); 578 } 579 580 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, 581 u32 center_freq, u32 bandwidth, 582 u32 prohibited_flags) 583 { 584 struct ieee80211_channel *c; 585 u32 freq, start_freq, end_freq; 586 587 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 588 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 589 590 for (freq = start_freq; freq <= end_freq; freq += 20) { 591 c = ieee80211_get_channel(wiphy, freq); 592 if (!c || c->flags & prohibited_flags) 593 return false; 594 } 595 596 return true; 597 } 598 599 bool cfg80211_chandef_usable(struct wiphy *wiphy, 600 const struct cfg80211_chan_def *chandef, 601 u32 prohibited_flags) 602 { 603 struct ieee80211_sta_ht_cap *ht_cap; 604 struct ieee80211_sta_vht_cap *vht_cap; 605 u32 width, control_freq; 606 607 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 608 return false; 609 610 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 611 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 612 613 control_freq = chandef->chan->center_freq; 614 615 switch (chandef->width) { 616 case NL80211_CHAN_WIDTH_5: 617 width = 5; 618 break; 619 case NL80211_CHAN_WIDTH_10: 620 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 621 width = 10; 622 break; 623 case NL80211_CHAN_WIDTH_20: 624 if (!ht_cap->ht_supported) 625 return false; 626 case NL80211_CHAN_WIDTH_20_NOHT: 627 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 628 width = 20; 629 break; 630 case NL80211_CHAN_WIDTH_40: 631 width = 40; 632 if (!ht_cap->ht_supported) 633 return false; 634 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 635 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 636 return false; 637 if (chandef->center_freq1 < control_freq && 638 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 639 return false; 640 if (chandef->center_freq1 > control_freq && 641 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 642 return false; 643 break; 644 case NL80211_CHAN_WIDTH_80P80: 645 if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)) 646 return false; 647 case NL80211_CHAN_WIDTH_80: 648 if (!vht_cap->vht_supported) 649 return false; 650 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 651 width = 80; 652 break; 653 case NL80211_CHAN_WIDTH_160: 654 if (!vht_cap->vht_supported) 655 return false; 656 if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)) 657 return false; 658 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 659 width = 160; 660 break; 661 default: 662 WARN_ON_ONCE(1); 663 return false; 664 } 665 666 /* 667 * TODO: What if there are only certain 80/160/80+80 MHz channels 668 * allowed by the driver, or only certain combinations? 669 * For 40 MHz the driver can set the NO_HT40 flags, but for 670 * 80/160 MHz and in particular 80+80 MHz this isn't really 671 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 672 * no way to cover 80+80 MHz or more complex restrictions. 673 * Note that such restrictions also need to be advertised to 674 * userspace, for example for P2P channel selection. 675 */ 676 677 if (width > 20) 678 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 679 680 /* 5 and 10 MHz are only defined for the OFDM PHY */ 681 if (width < 20) 682 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 683 684 685 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1, 686 width, prohibited_flags)) 687 return false; 688 689 if (!chandef->center_freq2) 690 return true; 691 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, 692 width, prohibited_flags); 693 } 694 EXPORT_SYMBOL(cfg80211_chandef_usable); 695 696 /* 697 * For GO only, check if the channel can be used under permissive conditions 698 * mandated by the some regulatory bodies, i.e., the channel is marked with 699 * IEEE80211_CHAN_GO_CONCURRENT and there is an additional station interface 700 * associated to an AP on the same channel or on the same UNII band 701 * (assuming that the AP is an authorized master). 702 * In addition allow the GO to operate on a channel on which indoor operation is 703 * allowed, iff we are currently operating in an indoor environment. 704 */ 705 static bool cfg80211_go_permissive_chan(struct cfg80211_registered_device *rdev, 706 struct ieee80211_channel *chan) 707 { 708 struct wireless_dev *wdev_iter; 709 struct wiphy *wiphy = wiphy_idx_to_wiphy(rdev->wiphy_idx); 710 711 ASSERT_RTNL(); 712 713 if (!config_enabled(CONFIG_CFG80211_REG_RELAX_NO_IR) || 714 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 715 return false; 716 717 if (regulatory_indoor_allowed() && 718 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 719 return true; 720 721 if (!(chan->flags & IEEE80211_CHAN_GO_CONCURRENT)) 722 return false; 723 724 /* 725 * Generally, it is possible to rely on another device/driver to allow 726 * the GO concurrent relaxation, however, since the device can further 727 * enforce the relaxation (by doing a similar verifications as this), 728 * and thus fail the GO instantiation, consider only the interfaces of 729 * the current registered device. 730 */ 731 list_for_each_entry(wdev_iter, &rdev->wdev_list, list) { 732 struct ieee80211_channel *other_chan = NULL; 733 int r1, r2; 734 735 if (wdev_iter->iftype != NL80211_IFTYPE_STATION || 736 !netif_running(wdev_iter->netdev)) 737 continue; 738 739 wdev_lock(wdev_iter); 740 if (wdev_iter->current_bss) 741 other_chan = wdev_iter->current_bss->pub.channel; 742 wdev_unlock(wdev_iter); 743 744 if (!other_chan) 745 continue; 746 747 if (chan == other_chan) 748 return true; 749 750 if (chan->band != IEEE80211_BAND_5GHZ) 751 continue; 752 753 r1 = cfg80211_get_unii(chan->center_freq); 754 r2 = cfg80211_get_unii(other_chan->center_freq); 755 756 if (r1 != -EINVAL && r1 == r2) { 757 /* 758 * At some locations channels 149-165 are considered a 759 * bundle, but at other locations, e.g., Indonesia, 760 * channels 149-161 are considered a bundle while 761 * channel 165 is left out and considered to be in a 762 * different bundle. Thus, in case that there is a 763 * station interface connected to an AP on channel 165, 764 * it is assumed that channels 149-161 are allowed for 765 * GO operations. However, having a station interface 766 * connected to an AP on channels 149-161, does not 767 * allow GO operation on channel 165. 768 */ 769 if (chan->center_freq == 5825 && 770 other_chan->center_freq != 5825) 771 continue; 772 return true; 773 } 774 } 775 776 return false; 777 } 778 779 bool cfg80211_reg_can_beacon(struct wiphy *wiphy, 780 struct cfg80211_chan_def *chandef, 781 enum nl80211_iftype iftype) 782 { 783 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 784 bool res; 785 u32 prohibited_flags = IEEE80211_CHAN_DISABLED | 786 IEEE80211_CHAN_RADAR; 787 788 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype); 789 790 /* 791 * Under certain conditions suggested by the some regulatory bodies 792 * a GO can operate on channels marked with IEEE80211_NO_IR 793 * so set this flag only if such relaxations are not enabled and 794 * the conditions are not met. 795 */ 796 if (iftype != NL80211_IFTYPE_P2P_GO || 797 !cfg80211_go_permissive_chan(rdev, chandef->chan)) 798 prohibited_flags |= IEEE80211_CHAN_NO_IR; 799 800 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && 801 cfg80211_chandef_dfs_available(wiphy, chandef)) { 802 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 803 prohibited_flags = IEEE80211_CHAN_DISABLED; 804 } 805 806 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); 807 808 trace_cfg80211_return_bool(res); 809 return res; 810 } 811 EXPORT_SYMBOL(cfg80211_reg_can_beacon); 812 813 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 814 struct cfg80211_chan_def *chandef) 815 { 816 if (!rdev->ops->set_monitor_channel) 817 return -EOPNOTSUPP; 818 if (!cfg80211_has_monitors_only(rdev)) 819 return -EBUSY; 820 821 return rdev_set_monitor_channel(rdev, chandef); 822 } 823 824 void 825 cfg80211_get_chan_state(struct wireless_dev *wdev, 826 struct ieee80211_channel **chan, 827 enum cfg80211_chan_mode *chanmode, 828 u8 *radar_detect) 829 { 830 int ret; 831 832 *chan = NULL; 833 *chanmode = CHAN_MODE_UNDEFINED; 834 835 ASSERT_WDEV_LOCK(wdev); 836 837 if (wdev->netdev && !netif_running(wdev->netdev)) 838 return; 839 840 switch (wdev->iftype) { 841 case NL80211_IFTYPE_ADHOC: 842 if (wdev->current_bss) { 843 *chan = wdev->current_bss->pub.channel; 844 *chanmode = (wdev->ibss_fixed && 845 !wdev->ibss_dfs_possible) 846 ? CHAN_MODE_SHARED 847 : CHAN_MODE_EXCLUSIVE; 848 849 /* consider worst-case - IBSS can try to return to the 850 * original user-specified channel as creator */ 851 if (wdev->ibss_dfs_possible) 852 *radar_detect |= BIT(wdev->chandef.width); 853 return; 854 } 855 break; 856 case NL80211_IFTYPE_STATION: 857 case NL80211_IFTYPE_P2P_CLIENT: 858 if (wdev->current_bss) { 859 *chan = wdev->current_bss->pub.channel; 860 *chanmode = CHAN_MODE_SHARED; 861 return; 862 } 863 break; 864 case NL80211_IFTYPE_AP: 865 case NL80211_IFTYPE_P2P_GO: 866 if (wdev->cac_started) { 867 *chan = wdev->chandef.chan; 868 *chanmode = CHAN_MODE_SHARED; 869 *radar_detect |= BIT(wdev->chandef.width); 870 } else if (wdev->beacon_interval) { 871 *chan = wdev->chandef.chan; 872 *chanmode = CHAN_MODE_SHARED; 873 874 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 875 &wdev->chandef, 876 wdev->iftype); 877 WARN_ON(ret < 0); 878 if (ret > 0) 879 *radar_detect |= BIT(wdev->chandef.width); 880 } 881 return; 882 case NL80211_IFTYPE_MESH_POINT: 883 if (wdev->mesh_id_len) { 884 *chan = wdev->chandef.chan; 885 *chanmode = CHAN_MODE_SHARED; 886 887 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 888 &wdev->chandef, 889 wdev->iftype); 890 WARN_ON(ret < 0); 891 if (ret > 0) 892 *radar_detect |= BIT(wdev->chandef.width); 893 } 894 return; 895 case NL80211_IFTYPE_MONITOR: 896 case NL80211_IFTYPE_AP_VLAN: 897 case NL80211_IFTYPE_WDS: 898 case NL80211_IFTYPE_P2P_DEVICE: 899 /* these interface types don't really have a channel */ 900 return; 901 case NL80211_IFTYPE_UNSPECIFIED: 902 case NUM_NL80211_IFTYPES: 903 WARN_ON(1); 904 } 905 } 906