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 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, 461 u32 center_freq, 462 u32 bandwidth) 463 { 464 struct ieee80211_channel *c; 465 u32 freq, start_freq, end_freq; 466 467 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 468 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 469 470 /* 471 * Check entire range of channels for the bandwidth. 472 * If any channel in between is disabled or has not 473 * had gone through CAC return false 474 */ 475 for (freq = start_freq; freq <= end_freq; freq += 20) { 476 c = ieee80211_get_channel(wiphy, freq); 477 if (!c) 478 return false; 479 480 if (c->flags & IEEE80211_CHAN_DISABLED) 481 return false; 482 483 if ((c->flags & IEEE80211_CHAN_RADAR) && 484 (c->dfs_state != NL80211_DFS_AVAILABLE)) 485 return false; 486 } 487 488 return true; 489 } 490 491 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 492 const struct cfg80211_chan_def *chandef) 493 { 494 int width; 495 int r; 496 497 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 498 return false; 499 500 width = cfg80211_chandef_get_width(chandef); 501 if (width < 0) 502 return false; 503 504 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1, 505 width); 506 507 /* If any of channels unavailable for cf1 just return */ 508 if (!r) 509 return r; 510 511 switch (chandef->width) { 512 case NL80211_CHAN_WIDTH_80P80: 513 WARN_ON(!chandef->center_freq2); 514 r = cfg80211_get_chans_dfs_available(wiphy, 515 chandef->center_freq2, 516 width); 517 break; 518 default: 519 WARN_ON(chandef->center_freq2); 520 break; 521 } 522 523 return r; 524 } 525 526 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, 527 u32 center_freq, 528 u32 bandwidth) 529 { 530 struct ieee80211_channel *c; 531 u32 start_freq, end_freq, freq; 532 unsigned int dfs_cac_ms = 0; 533 534 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 535 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 536 537 for (freq = start_freq; freq <= end_freq; freq += 20) { 538 c = ieee80211_get_channel(wiphy, freq); 539 if (!c) 540 return 0; 541 542 if (c->flags & IEEE80211_CHAN_DISABLED) 543 return 0; 544 545 if (!(c->flags & IEEE80211_CHAN_RADAR)) 546 continue; 547 548 if (c->dfs_cac_ms > dfs_cac_ms) 549 dfs_cac_ms = c->dfs_cac_ms; 550 } 551 552 return dfs_cac_ms; 553 } 554 555 unsigned int 556 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 557 const struct cfg80211_chan_def *chandef) 558 { 559 int width; 560 unsigned int t1 = 0, t2 = 0; 561 562 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 563 return 0; 564 565 width = cfg80211_chandef_get_width(chandef); 566 if (width < 0) 567 return 0; 568 569 t1 = cfg80211_get_chans_dfs_cac_time(wiphy, 570 chandef->center_freq1, 571 width); 572 573 if (!chandef->center_freq2) 574 return t1; 575 576 t2 = cfg80211_get_chans_dfs_cac_time(wiphy, 577 chandef->center_freq2, 578 width); 579 580 return max(t1, t2); 581 } 582 583 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, 584 u32 center_freq, u32 bandwidth, 585 u32 prohibited_flags) 586 { 587 struct ieee80211_channel *c; 588 u32 freq, start_freq, end_freq; 589 590 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 591 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 592 593 for (freq = start_freq; freq <= end_freq; freq += 20) { 594 c = ieee80211_get_channel(wiphy, freq); 595 if (!c || c->flags & prohibited_flags) 596 return false; 597 } 598 599 return true; 600 } 601 602 bool cfg80211_chandef_usable(struct wiphy *wiphy, 603 const struct cfg80211_chan_def *chandef, 604 u32 prohibited_flags) 605 { 606 struct ieee80211_sta_ht_cap *ht_cap; 607 struct ieee80211_sta_vht_cap *vht_cap; 608 u32 width, control_freq, cap; 609 610 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 611 return false; 612 613 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 614 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 615 616 control_freq = chandef->chan->center_freq; 617 618 switch (chandef->width) { 619 case NL80211_CHAN_WIDTH_5: 620 width = 5; 621 break; 622 case NL80211_CHAN_WIDTH_10: 623 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 624 width = 10; 625 break; 626 case NL80211_CHAN_WIDTH_20: 627 if (!ht_cap->ht_supported) 628 return false; 629 case NL80211_CHAN_WIDTH_20_NOHT: 630 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 631 width = 20; 632 break; 633 case NL80211_CHAN_WIDTH_40: 634 width = 40; 635 if (!ht_cap->ht_supported) 636 return false; 637 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 638 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 639 return false; 640 if (chandef->center_freq1 < control_freq && 641 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 642 return false; 643 if (chandef->center_freq1 > control_freq && 644 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 645 return false; 646 break; 647 case NL80211_CHAN_WIDTH_80P80: 648 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 649 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 650 return false; 651 case NL80211_CHAN_WIDTH_80: 652 if (!vht_cap->vht_supported) 653 return false; 654 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 655 width = 80; 656 break; 657 case NL80211_CHAN_WIDTH_160: 658 if (!vht_cap->vht_supported) 659 return false; 660 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 661 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 662 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 663 return false; 664 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 665 width = 160; 666 break; 667 default: 668 WARN_ON_ONCE(1); 669 return false; 670 } 671 672 /* 673 * TODO: What if there are only certain 80/160/80+80 MHz channels 674 * allowed by the driver, or only certain combinations? 675 * For 40 MHz the driver can set the NO_HT40 flags, but for 676 * 80/160 MHz and in particular 80+80 MHz this isn't really 677 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 678 * no way to cover 80+80 MHz or more complex restrictions. 679 * Note that such restrictions also need to be advertised to 680 * userspace, for example for P2P channel selection. 681 */ 682 683 if (width > 20) 684 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 685 686 /* 5 and 10 MHz are only defined for the OFDM PHY */ 687 if (width < 20) 688 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 689 690 691 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1, 692 width, prohibited_flags)) 693 return false; 694 695 if (!chandef->center_freq2) 696 return true; 697 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, 698 width, prohibited_flags); 699 } 700 EXPORT_SYMBOL(cfg80211_chandef_usable); 701 702 /* 703 * Check if the channel can be used under permissive conditions mandated by 704 * some regulatory bodies, i.e., the channel is marked with 705 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface 706 * associated to an AP on the same channel or on the same UNII band 707 * (assuming that the AP is an authorized master). 708 * In addition allow operation on a channel on which indoor operation is 709 * allowed, iff we are currently operating in an indoor environment. 710 */ 711 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 712 enum nl80211_iftype iftype, 713 struct ieee80211_channel *chan) 714 { 715 struct wireless_dev *wdev; 716 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 717 718 ASSERT_RTNL(); 719 720 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || 721 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 722 return false; 723 724 /* only valid for GO and TDLS off-channel (station/p2p-CL) */ 725 if (iftype != NL80211_IFTYPE_P2P_GO && 726 iftype != NL80211_IFTYPE_STATION && 727 iftype != NL80211_IFTYPE_P2P_CLIENT) 728 return false; 729 730 if (regulatory_indoor_allowed() && 731 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 732 return true; 733 734 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) 735 return false; 736 737 /* 738 * Generally, it is possible to rely on another device/driver to allow 739 * the IR concurrent relaxation, however, since the device can further 740 * enforce the relaxation (by doing a similar verifications as this), 741 * and thus fail the GO instantiation, consider only the interfaces of 742 * the current registered device. 743 */ 744 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 745 struct ieee80211_channel *other_chan = NULL; 746 int r1, r2; 747 748 wdev_lock(wdev); 749 if (wdev->iftype == NL80211_IFTYPE_STATION && 750 wdev->current_bss) 751 other_chan = wdev->current_bss->pub.channel; 752 753 /* 754 * If a GO already operates on the same GO_CONCURRENT channel, 755 * this one (maybe the same one) can beacon as well. We allow 756 * the operation even if the station we relied on with 757 * GO_CONCURRENT is disconnected now. But then we must make sure 758 * we're not outdoor on an indoor-only channel. 759 */ 760 if (iftype == NL80211_IFTYPE_P2P_GO && 761 wdev->iftype == NL80211_IFTYPE_P2P_GO && 762 wdev->beacon_interval && 763 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 764 other_chan = wdev->chandef.chan; 765 wdev_unlock(wdev); 766 767 if (!other_chan) 768 continue; 769 770 if (chan == other_chan) 771 return true; 772 773 if (chan->band != NL80211_BAND_5GHZ) 774 continue; 775 776 r1 = cfg80211_get_unii(chan->center_freq); 777 r2 = cfg80211_get_unii(other_chan->center_freq); 778 779 if (r1 != -EINVAL && r1 == r2) { 780 /* 781 * At some locations channels 149-165 are considered a 782 * bundle, but at other locations, e.g., Indonesia, 783 * channels 149-161 are considered a bundle while 784 * channel 165 is left out and considered to be in a 785 * different bundle. Thus, in case that there is a 786 * station interface connected to an AP on channel 165, 787 * it is assumed that channels 149-161 are allowed for 788 * GO operations. However, having a station interface 789 * connected to an AP on channels 149-161, does not 790 * allow GO operation on channel 165. 791 */ 792 if (chan->center_freq == 5825 && 793 other_chan->center_freq != 5825) 794 continue; 795 return true; 796 } 797 } 798 799 return false; 800 } 801 802 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, 803 struct cfg80211_chan_def *chandef, 804 enum nl80211_iftype iftype, 805 bool check_no_ir) 806 { 807 bool res; 808 u32 prohibited_flags = IEEE80211_CHAN_DISABLED | 809 IEEE80211_CHAN_RADAR; 810 811 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 812 813 if (check_no_ir) 814 prohibited_flags |= IEEE80211_CHAN_NO_IR; 815 816 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && 817 cfg80211_chandef_dfs_available(wiphy, chandef)) { 818 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 819 prohibited_flags = IEEE80211_CHAN_DISABLED; 820 } 821 822 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); 823 824 trace_cfg80211_return_bool(res); 825 return res; 826 } 827 828 bool cfg80211_reg_can_beacon(struct wiphy *wiphy, 829 struct cfg80211_chan_def *chandef, 830 enum nl80211_iftype iftype) 831 { 832 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); 833 } 834 EXPORT_SYMBOL(cfg80211_reg_can_beacon); 835 836 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, 837 struct cfg80211_chan_def *chandef, 838 enum nl80211_iftype iftype) 839 { 840 bool check_no_ir; 841 842 ASSERT_RTNL(); 843 844 /* 845 * Under certain conditions suggested by some regulatory bodies a 846 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag 847 * only if such relaxations are not enabled and the conditions are not 848 * met. 849 */ 850 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, 851 chandef->chan); 852 853 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 854 } 855 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); 856 857 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 858 struct cfg80211_chan_def *chandef) 859 { 860 if (!rdev->ops->set_monitor_channel) 861 return -EOPNOTSUPP; 862 if (!cfg80211_has_monitors_only(rdev)) 863 return -EBUSY; 864 865 return rdev_set_monitor_channel(rdev, chandef); 866 } 867 868 void 869 cfg80211_get_chan_state(struct wireless_dev *wdev, 870 struct ieee80211_channel **chan, 871 enum cfg80211_chan_mode *chanmode, 872 u8 *radar_detect) 873 { 874 int ret; 875 876 *chan = NULL; 877 *chanmode = CHAN_MODE_UNDEFINED; 878 879 ASSERT_WDEV_LOCK(wdev); 880 881 if (wdev->netdev && !netif_running(wdev->netdev)) 882 return; 883 884 switch (wdev->iftype) { 885 case NL80211_IFTYPE_ADHOC: 886 if (wdev->current_bss) { 887 *chan = wdev->current_bss->pub.channel; 888 *chanmode = (wdev->ibss_fixed && 889 !wdev->ibss_dfs_possible) 890 ? CHAN_MODE_SHARED 891 : CHAN_MODE_EXCLUSIVE; 892 893 /* consider worst-case - IBSS can try to return to the 894 * original user-specified channel as creator */ 895 if (wdev->ibss_dfs_possible) 896 *radar_detect |= BIT(wdev->chandef.width); 897 return; 898 } 899 break; 900 case NL80211_IFTYPE_STATION: 901 case NL80211_IFTYPE_P2P_CLIENT: 902 if (wdev->current_bss) { 903 *chan = wdev->current_bss->pub.channel; 904 *chanmode = CHAN_MODE_SHARED; 905 return; 906 } 907 break; 908 case NL80211_IFTYPE_AP: 909 case NL80211_IFTYPE_P2P_GO: 910 if (wdev->cac_started) { 911 *chan = wdev->chandef.chan; 912 *chanmode = CHAN_MODE_SHARED; 913 *radar_detect |= BIT(wdev->chandef.width); 914 } else if (wdev->beacon_interval) { 915 *chan = wdev->chandef.chan; 916 *chanmode = CHAN_MODE_SHARED; 917 918 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 919 &wdev->chandef, 920 wdev->iftype); 921 WARN_ON(ret < 0); 922 if (ret > 0) 923 *radar_detect |= BIT(wdev->chandef.width); 924 } 925 return; 926 case NL80211_IFTYPE_MESH_POINT: 927 if (wdev->mesh_id_len) { 928 *chan = wdev->chandef.chan; 929 *chanmode = CHAN_MODE_SHARED; 930 931 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 932 &wdev->chandef, 933 wdev->iftype); 934 WARN_ON(ret < 0); 935 if (ret > 0) 936 *radar_detect |= BIT(wdev->chandef.width); 937 } 938 return; 939 case NL80211_IFTYPE_OCB: 940 if (wdev->chandef.chan) { 941 *chan = wdev->chandef.chan; 942 *chanmode = CHAN_MODE_SHARED; 943 return; 944 } 945 break; 946 case NL80211_IFTYPE_MONITOR: 947 case NL80211_IFTYPE_AP_VLAN: 948 case NL80211_IFTYPE_WDS: 949 case NL80211_IFTYPE_P2P_DEVICE: 950 case NL80211_IFTYPE_NAN: 951 /* these interface types don't really have a channel */ 952 return; 953 case NL80211_IFTYPE_UNSPECIFIED: 954 case NUM_NL80211_IFTYPES: 955 WARN_ON(1); 956 } 957 } 958