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 break; 376 case NL80211_IFTYPE_UNSPECIFIED: 377 case NUM_NL80211_IFTYPES: 378 WARN_ON(1); 379 } 380 381 return 0; 382 } 383 EXPORT_SYMBOL(cfg80211_chandef_dfs_required); 384 385 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, 386 u32 center_freq, 387 u32 bandwidth) 388 { 389 struct ieee80211_channel *c; 390 u32 freq, start_freq, end_freq; 391 int count = 0; 392 393 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 394 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 395 396 /* 397 * Check entire range of channels for the bandwidth. 398 * Check all channels are DFS channels (DFS_USABLE or 399 * DFS_AVAILABLE). Return number of usable channels 400 * (require CAC). Allow DFS and non-DFS channel mix. 401 */ 402 for (freq = start_freq; freq <= end_freq; freq += 20) { 403 c = ieee80211_get_channel(wiphy, freq); 404 if (!c) 405 return -EINVAL; 406 407 if (c->flags & IEEE80211_CHAN_DISABLED) 408 return -EINVAL; 409 410 if (c->flags & IEEE80211_CHAN_RADAR) { 411 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) 412 return -EINVAL; 413 414 if (c->dfs_state == NL80211_DFS_USABLE) 415 count++; 416 } 417 } 418 419 return count; 420 } 421 422 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, 423 const struct cfg80211_chan_def *chandef) 424 { 425 int width; 426 int r1, r2 = 0; 427 428 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 429 return false; 430 431 width = cfg80211_chandef_get_width(chandef); 432 if (width < 0) 433 return false; 434 435 r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1, 436 width); 437 438 if (r1 < 0) 439 return false; 440 441 switch (chandef->width) { 442 case NL80211_CHAN_WIDTH_80P80: 443 WARN_ON(!chandef->center_freq2); 444 r2 = cfg80211_get_chans_dfs_usable(wiphy, 445 chandef->center_freq2, 446 width); 447 if (r2 < 0) 448 return false; 449 break; 450 default: 451 WARN_ON(chandef->center_freq2); 452 break; 453 } 454 455 return (r1 + r2 > 0); 456 } 457 458 459 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, 460 u32 center_freq, 461 u32 bandwidth) 462 { 463 struct ieee80211_channel *c; 464 u32 freq, start_freq, end_freq; 465 466 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 467 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 468 469 /* 470 * Check entire range of channels for the bandwidth. 471 * If any channel in between is disabled or has not 472 * had gone through CAC return false 473 */ 474 for (freq = start_freq; freq <= end_freq; freq += 20) { 475 c = ieee80211_get_channel(wiphy, freq); 476 if (!c) 477 return false; 478 479 if (c->flags & IEEE80211_CHAN_DISABLED) 480 return false; 481 482 if ((c->flags & IEEE80211_CHAN_RADAR) && 483 (c->dfs_state != NL80211_DFS_AVAILABLE)) 484 return false; 485 } 486 487 return true; 488 } 489 490 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 491 const struct cfg80211_chan_def *chandef) 492 { 493 int width; 494 int r; 495 496 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 497 return false; 498 499 width = cfg80211_chandef_get_width(chandef); 500 if (width < 0) 501 return false; 502 503 r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1, 504 width); 505 506 /* If any of channels unavailable for cf1 just return */ 507 if (!r) 508 return r; 509 510 switch (chandef->width) { 511 case NL80211_CHAN_WIDTH_80P80: 512 WARN_ON(!chandef->center_freq2); 513 r = cfg80211_get_chans_dfs_available(wiphy, 514 chandef->center_freq2, 515 width); 516 default: 517 WARN_ON(chandef->center_freq2); 518 break; 519 } 520 521 return r; 522 } 523 524 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, 525 u32 center_freq, 526 u32 bandwidth) 527 { 528 struct ieee80211_channel *c; 529 u32 start_freq, end_freq, freq; 530 unsigned int dfs_cac_ms = 0; 531 532 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 533 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 534 535 for (freq = start_freq; freq <= end_freq; freq += 20) { 536 c = ieee80211_get_channel(wiphy, freq); 537 if (!c) 538 return 0; 539 540 if (c->flags & IEEE80211_CHAN_DISABLED) 541 return 0; 542 543 if (!(c->flags & IEEE80211_CHAN_RADAR)) 544 continue; 545 546 if (c->dfs_cac_ms > dfs_cac_ms) 547 dfs_cac_ms = c->dfs_cac_ms; 548 } 549 550 return dfs_cac_ms; 551 } 552 553 unsigned int 554 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 555 const struct cfg80211_chan_def *chandef) 556 { 557 int width; 558 unsigned int t1 = 0, t2 = 0; 559 560 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 561 return 0; 562 563 width = cfg80211_chandef_get_width(chandef); 564 if (width < 0) 565 return 0; 566 567 t1 = cfg80211_get_chans_dfs_cac_time(wiphy, 568 chandef->center_freq1, 569 width); 570 571 if (!chandef->center_freq2) 572 return t1; 573 574 t2 = cfg80211_get_chans_dfs_cac_time(wiphy, 575 chandef->center_freq2, 576 width); 577 578 return max(t1, t2); 579 } 580 581 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, 582 u32 center_freq, u32 bandwidth, 583 u32 prohibited_flags) 584 { 585 struct ieee80211_channel *c; 586 u32 freq, start_freq, end_freq; 587 588 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 589 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 590 591 for (freq = start_freq; freq <= end_freq; freq += 20) { 592 c = ieee80211_get_channel(wiphy, freq); 593 if (!c || c->flags & prohibited_flags) 594 return false; 595 } 596 597 return true; 598 } 599 600 bool cfg80211_chandef_usable(struct wiphy *wiphy, 601 const struct cfg80211_chan_def *chandef, 602 u32 prohibited_flags) 603 { 604 struct ieee80211_sta_ht_cap *ht_cap; 605 struct ieee80211_sta_vht_cap *vht_cap; 606 u32 width, control_freq, cap; 607 608 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 609 return false; 610 611 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 612 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 613 614 control_freq = chandef->chan->center_freq; 615 616 switch (chandef->width) { 617 case NL80211_CHAN_WIDTH_5: 618 width = 5; 619 break; 620 case NL80211_CHAN_WIDTH_10: 621 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 622 width = 10; 623 break; 624 case NL80211_CHAN_WIDTH_20: 625 if (!ht_cap->ht_supported) 626 return false; 627 case NL80211_CHAN_WIDTH_20_NOHT: 628 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 629 width = 20; 630 break; 631 case NL80211_CHAN_WIDTH_40: 632 width = 40; 633 if (!ht_cap->ht_supported) 634 return false; 635 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 636 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 637 return false; 638 if (chandef->center_freq1 < control_freq && 639 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 640 return false; 641 if (chandef->center_freq1 > control_freq && 642 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 643 return false; 644 break; 645 case NL80211_CHAN_WIDTH_80P80: 646 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 647 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 648 return false; 649 case NL80211_CHAN_WIDTH_80: 650 if (!vht_cap->vht_supported) 651 return false; 652 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 653 width = 80; 654 break; 655 case NL80211_CHAN_WIDTH_160: 656 if (!vht_cap->vht_supported) 657 return false; 658 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 659 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 660 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) 661 return false; 662 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 663 width = 160; 664 break; 665 default: 666 WARN_ON_ONCE(1); 667 return false; 668 } 669 670 /* 671 * TODO: What if there are only certain 80/160/80+80 MHz channels 672 * allowed by the driver, or only certain combinations? 673 * For 40 MHz the driver can set the NO_HT40 flags, but for 674 * 80/160 MHz and in particular 80+80 MHz this isn't really 675 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 676 * no way to cover 80+80 MHz or more complex restrictions. 677 * Note that such restrictions also need to be advertised to 678 * userspace, for example for P2P channel selection. 679 */ 680 681 if (width > 20) 682 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 683 684 /* 5 and 10 MHz are only defined for the OFDM PHY */ 685 if (width < 20) 686 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 687 688 689 if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1, 690 width, prohibited_flags)) 691 return false; 692 693 if (!chandef->center_freq2) 694 return true; 695 return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, 696 width, prohibited_flags); 697 } 698 EXPORT_SYMBOL(cfg80211_chandef_usable); 699 700 /* 701 * Check if the channel can be used under permissive conditions mandated by 702 * some regulatory bodies, i.e., the channel is marked with 703 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface 704 * associated to an AP on the same channel or on the same UNII band 705 * (assuming that the AP is an authorized master). 706 * In addition allow operation on a channel on which indoor operation is 707 * allowed, iff we are currently operating in an indoor environment. 708 */ 709 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 710 enum nl80211_iftype iftype, 711 struct ieee80211_channel *chan) 712 { 713 struct wireless_dev *wdev; 714 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 715 716 ASSERT_RTNL(); 717 718 if (!config_enabled(CONFIG_CFG80211_REG_RELAX_NO_IR) || 719 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 720 return false; 721 722 /* only valid for GO and TDLS off-channel (station/p2p-CL) */ 723 if (iftype != NL80211_IFTYPE_P2P_GO && 724 iftype != NL80211_IFTYPE_STATION && 725 iftype != NL80211_IFTYPE_P2P_CLIENT) 726 return false; 727 728 if (regulatory_indoor_allowed() && 729 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 730 return true; 731 732 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) 733 return false; 734 735 /* 736 * Generally, it is possible to rely on another device/driver to allow 737 * the IR concurrent relaxation, however, since the device can further 738 * enforce the relaxation (by doing a similar verifications as this), 739 * and thus fail the GO instantiation, consider only the interfaces of 740 * the current registered device. 741 */ 742 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 743 struct ieee80211_channel *other_chan = NULL; 744 int r1, r2; 745 746 wdev_lock(wdev); 747 if (wdev->iftype == NL80211_IFTYPE_STATION && 748 wdev->current_bss) 749 other_chan = wdev->current_bss->pub.channel; 750 751 /* 752 * If a GO already operates on the same GO_CONCURRENT channel, 753 * this one (maybe the same one) can beacon as well. We allow 754 * the operation even if the station we relied on with 755 * GO_CONCURRENT is disconnected now. But then we must make sure 756 * we're not outdoor on an indoor-only channel. 757 */ 758 if (iftype == NL80211_IFTYPE_P2P_GO && 759 wdev->iftype == NL80211_IFTYPE_P2P_GO && 760 wdev->beacon_interval && 761 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 762 other_chan = wdev->chandef.chan; 763 wdev_unlock(wdev); 764 765 if (!other_chan) 766 continue; 767 768 if (chan == other_chan) 769 return true; 770 771 if (chan->band != NL80211_BAND_5GHZ) 772 continue; 773 774 r1 = cfg80211_get_unii(chan->center_freq); 775 r2 = cfg80211_get_unii(other_chan->center_freq); 776 777 if (r1 != -EINVAL && r1 == r2) { 778 /* 779 * At some locations channels 149-165 are considered a 780 * bundle, but at other locations, e.g., Indonesia, 781 * channels 149-161 are considered a bundle while 782 * channel 165 is left out and considered to be in a 783 * different bundle. Thus, in case that there is a 784 * station interface connected to an AP on channel 165, 785 * it is assumed that channels 149-161 are allowed for 786 * GO operations. However, having a station interface 787 * connected to an AP on channels 149-161, does not 788 * allow GO operation on channel 165. 789 */ 790 if (chan->center_freq == 5825 && 791 other_chan->center_freq != 5825) 792 continue; 793 return true; 794 } 795 } 796 797 return false; 798 } 799 800 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, 801 struct cfg80211_chan_def *chandef, 802 enum nl80211_iftype iftype, 803 bool check_no_ir) 804 { 805 bool res; 806 u32 prohibited_flags = IEEE80211_CHAN_DISABLED | 807 IEEE80211_CHAN_RADAR; 808 809 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 810 811 if (check_no_ir) 812 prohibited_flags |= IEEE80211_CHAN_NO_IR; 813 814 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && 815 cfg80211_chandef_dfs_available(wiphy, chandef)) { 816 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 817 prohibited_flags = IEEE80211_CHAN_DISABLED; 818 } 819 820 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); 821 822 trace_cfg80211_return_bool(res); 823 return res; 824 } 825 826 bool cfg80211_reg_can_beacon(struct wiphy *wiphy, 827 struct cfg80211_chan_def *chandef, 828 enum nl80211_iftype iftype) 829 { 830 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); 831 } 832 EXPORT_SYMBOL(cfg80211_reg_can_beacon); 833 834 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, 835 struct cfg80211_chan_def *chandef, 836 enum nl80211_iftype iftype) 837 { 838 bool check_no_ir; 839 840 ASSERT_RTNL(); 841 842 /* 843 * Under certain conditions suggested by some regulatory bodies a 844 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag 845 * only if such relaxations are not enabled and the conditions are not 846 * met. 847 */ 848 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, 849 chandef->chan); 850 851 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 852 } 853 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); 854 855 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 856 struct cfg80211_chan_def *chandef) 857 { 858 if (!rdev->ops->set_monitor_channel) 859 return -EOPNOTSUPP; 860 if (!cfg80211_has_monitors_only(rdev)) 861 return -EBUSY; 862 863 return rdev_set_monitor_channel(rdev, chandef); 864 } 865 866 void 867 cfg80211_get_chan_state(struct wireless_dev *wdev, 868 struct ieee80211_channel **chan, 869 enum cfg80211_chan_mode *chanmode, 870 u8 *radar_detect) 871 { 872 int ret; 873 874 *chan = NULL; 875 *chanmode = CHAN_MODE_UNDEFINED; 876 877 ASSERT_WDEV_LOCK(wdev); 878 879 if (wdev->netdev && !netif_running(wdev->netdev)) 880 return; 881 882 switch (wdev->iftype) { 883 case NL80211_IFTYPE_ADHOC: 884 if (wdev->current_bss) { 885 *chan = wdev->current_bss->pub.channel; 886 *chanmode = (wdev->ibss_fixed && 887 !wdev->ibss_dfs_possible) 888 ? CHAN_MODE_SHARED 889 : CHAN_MODE_EXCLUSIVE; 890 891 /* consider worst-case - IBSS can try to return to the 892 * original user-specified channel as creator */ 893 if (wdev->ibss_dfs_possible) 894 *radar_detect |= BIT(wdev->chandef.width); 895 return; 896 } 897 break; 898 case NL80211_IFTYPE_STATION: 899 case NL80211_IFTYPE_P2P_CLIENT: 900 if (wdev->current_bss) { 901 *chan = wdev->current_bss->pub.channel; 902 *chanmode = CHAN_MODE_SHARED; 903 return; 904 } 905 break; 906 case NL80211_IFTYPE_AP: 907 case NL80211_IFTYPE_P2P_GO: 908 if (wdev->cac_started) { 909 *chan = wdev->chandef.chan; 910 *chanmode = CHAN_MODE_SHARED; 911 *radar_detect |= BIT(wdev->chandef.width); 912 } else if (wdev->beacon_interval) { 913 *chan = wdev->chandef.chan; 914 *chanmode = CHAN_MODE_SHARED; 915 916 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 917 &wdev->chandef, 918 wdev->iftype); 919 WARN_ON(ret < 0); 920 if (ret > 0) 921 *radar_detect |= BIT(wdev->chandef.width); 922 } 923 return; 924 case NL80211_IFTYPE_MESH_POINT: 925 if (wdev->mesh_id_len) { 926 *chan = wdev->chandef.chan; 927 *chanmode = CHAN_MODE_SHARED; 928 929 ret = cfg80211_chandef_dfs_required(wdev->wiphy, 930 &wdev->chandef, 931 wdev->iftype); 932 WARN_ON(ret < 0); 933 if (ret > 0) 934 *radar_detect |= BIT(wdev->chandef.width); 935 } 936 return; 937 case NL80211_IFTYPE_OCB: 938 if (wdev->chandef.chan) { 939 *chan = wdev->chandef.chan; 940 *chanmode = CHAN_MODE_SHARED; 941 return; 942 } 943 break; 944 case NL80211_IFTYPE_MONITOR: 945 case NL80211_IFTYPE_AP_VLAN: 946 case NL80211_IFTYPE_WDS: 947 case NL80211_IFTYPE_P2P_DEVICE: 948 /* these interface types don't really have a channel */ 949 return; 950 case NL80211_IFTYPE_UNSPECIFIED: 951 case NUM_NL80211_IFTYPES: 952 WARN_ON(1); 953 } 954 } 955