1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * This file contains helper code to handle channel 4 * settings and keeping track of what is possible at 5 * any point in time. 6 * 7 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> 8 * Copyright 2013-2014 Intel Mobile Communications GmbH 9 * Copyright 2018-2022 Intel Corporation 10 */ 11 12 #include <linux/export.h> 13 #include <linux/bitfield.h> 14 #include <net/cfg80211.h> 15 #include "core.h" 16 #include "rdev-ops.h" 17 18 static bool cfg80211_valid_60g_freq(u32 freq) 19 { 20 return freq >= 58320 && freq <= 70200; 21 } 22 23 void cfg80211_chandef_create(struct cfg80211_chan_def *chandef, 24 struct ieee80211_channel *chan, 25 enum nl80211_channel_type chan_type) 26 { 27 if (WARN_ON(!chan)) 28 return; 29 30 chandef->chan = chan; 31 chandef->freq1_offset = chan->freq_offset; 32 chandef->center_freq2 = 0; 33 chandef->edmg.bw_config = 0; 34 chandef->edmg.channels = 0; 35 36 switch (chan_type) { 37 case NL80211_CHAN_NO_HT: 38 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 39 chandef->center_freq1 = chan->center_freq; 40 break; 41 case NL80211_CHAN_HT20: 42 chandef->width = NL80211_CHAN_WIDTH_20; 43 chandef->center_freq1 = chan->center_freq; 44 break; 45 case NL80211_CHAN_HT40PLUS: 46 chandef->width = NL80211_CHAN_WIDTH_40; 47 chandef->center_freq1 = chan->center_freq + 10; 48 break; 49 case NL80211_CHAN_HT40MINUS: 50 chandef->width = NL80211_CHAN_WIDTH_40; 51 chandef->center_freq1 = chan->center_freq - 10; 52 break; 53 default: 54 WARN_ON(1); 55 } 56 } 57 EXPORT_SYMBOL(cfg80211_chandef_create); 58 59 static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef) 60 { 61 int max_contiguous = 0; 62 int num_of_enabled = 0; 63 int contiguous = 0; 64 int i; 65 66 if (!chandef->edmg.channels || !chandef->edmg.bw_config) 67 return false; 68 69 if (!cfg80211_valid_60g_freq(chandef->chan->center_freq)) 70 return false; 71 72 for (i = 0; i < 6; i++) { 73 if (chandef->edmg.channels & BIT(i)) { 74 contiguous++; 75 num_of_enabled++; 76 } else { 77 contiguous = 0; 78 } 79 80 max_contiguous = max(contiguous, max_contiguous); 81 } 82 /* basic verification of edmg configuration according to 83 * IEEE P802.11ay/D4.0 section 9.4.2.251 84 */ 85 /* check bw_config against contiguous edmg channels */ 86 switch (chandef->edmg.bw_config) { 87 case IEEE80211_EDMG_BW_CONFIG_4: 88 case IEEE80211_EDMG_BW_CONFIG_8: 89 case IEEE80211_EDMG_BW_CONFIG_12: 90 if (max_contiguous < 1) 91 return false; 92 break; 93 case IEEE80211_EDMG_BW_CONFIG_5: 94 case IEEE80211_EDMG_BW_CONFIG_9: 95 case IEEE80211_EDMG_BW_CONFIG_13: 96 if (max_contiguous < 2) 97 return false; 98 break; 99 case IEEE80211_EDMG_BW_CONFIG_6: 100 case IEEE80211_EDMG_BW_CONFIG_10: 101 case IEEE80211_EDMG_BW_CONFIG_14: 102 if (max_contiguous < 3) 103 return false; 104 break; 105 case IEEE80211_EDMG_BW_CONFIG_7: 106 case IEEE80211_EDMG_BW_CONFIG_11: 107 case IEEE80211_EDMG_BW_CONFIG_15: 108 if (max_contiguous < 4) 109 return false; 110 break; 111 112 default: 113 return false; 114 } 115 116 /* check bw_config against aggregated (non contiguous) edmg channels */ 117 switch (chandef->edmg.bw_config) { 118 case IEEE80211_EDMG_BW_CONFIG_4: 119 case IEEE80211_EDMG_BW_CONFIG_5: 120 case IEEE80211_EDMG_BW_CONFIG_6: 121 case IEEE80211_EDMG_BW_CONFIG_7: 122 break; 123 case IEEE80211_EDMG_BW_CONFIG_8: 124 case IEEE80211_EDMG_BW_CONFIG_9: 125 case IEEE80211_EDMG_BW_CONFIG_10: 126 case IEEE80211_EDMG_BW_CONFIG_11: 127 if (num_of_enabled < 2) 128 return false; 129 break; 130 case IEEE80211_EDMG_BW_CONFIG_12: 131 case IEEE80211_EDMG_BW_CONFIG_13: 132 case IEEE80211_EDMG_BW_CONFIG_14: 133 case IEEE80211_EDMG_BW_CONFIG_15: 134 if (num_of_enabled < 4 || max_contiguous < 2) 135 return false; 136 break; 137 default: 138 return false; 139 } 140 141 return true; 142 } 143 144 static int nl80211_chan_width_to_mhz(enum nl80211_chan_width chan_width) 145 { 146 int mhz; 147 148 switch (chan_width) { 149 case NL80211_CHAN_WIDTH_1: 150 mhz = 1; 151 break; 152 case NL80211_CHAN_WIDTH_2: 153 mhz = 2; 154 break; 155 case NL80211_CHAN_WIDTH_4: 156 mhz = 4; 157 break; 158 case NL80211_CHAN_WIDTH_8: 159 mhz = 8; 160 break; 161 case NL80211_CHAN_WIDTH_16: 162 mhz = 16; 163 break; 164 case NL80211_CHAN_WIDTH_5: 165 mhz = 5; 166 break; 167 case NL80211_CHAN_WIDTH_10: 168 mhz = 10; 169 break; 170 case NL80211_CHAN_WIDTH_20: 171 case NL80211_CHAN_WIDTH_20_NOHT: 172 mhz = 20; 173 break; 174 case NL80211_CHAN_WIDTH_40: 175 mhz = 40; 176 break; 177 case NL80211_CHAN_WIDTH_80P80: 178 case NL80211_CHAN_WIDTH_80: 179 mhz = 80; 180 break; 181 case NL80211_CHAN_WIDTH_160: 182 mhz = 160; 183 break; 184 case NL80211_CHAN_WIDTH_320: 185 mhz = 320; 186 break; 187 default: 188 WARN_ON_ONCE(1); 189 return -1; 190 } 191 return mhz; 192 } 193 194 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) 195 { 196 return nl80211_chan_width_to_mhz(c->width); 197 } 198 199 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) 200 { 201 u32 control_freq, oper_freq; 202 int oper_width, control_width; 203 204 if (!chandef->chan) 205 return false; 206 207 if (chandef->freq1_offset >= 1000) 208 return false; 209 210 control_freq = chandef->chan->center_freq; 211 212 switch (chandef->width) { 213 case NL80211_CHAN_WIDTH_5: 214 case NL80211_CHAN_WIDTH_10: 215 case NL80211_CHAN_WIDTH_20: 216 case NL80211_CHAN_WIDTH_20_NOHT: 217 if (ieee80211_chandef_to_khz(chandef) != 218 ieee80211_channel_to_khz(chandef->chan)) 219 return false; 220 if (chandef->center_freq2) 221 return false; 222 break; 223 case NL80211_CHAN_WIDTH_1: 224 case NL80211_CHAN_WIDTH_2: 225 case NL80211_CHAN_WIDTH_4: 226 case NL80211_CHAN_WIDTH_8: 227 case NL80211_CHAN_WIDTH_16: 228 if (chandef->chan->band != NL80211_BAND_S1GHZ) 229 return false; 230 231 control_freq = ieee80211_channel_to_khz(chandef->chan); 232 oper_freq = ieee80211_chandef_to_khz(chandef); 233 control_width = nl80211_chan_width_to_mhz( 234 ieee80211_s1g_channel_width( 235 chandef->chan)); 236 oper_width = cfg80211_chandef_get_width(chandef); 237 238 if (oper_width < 0 || control_width < 0) 239 return false; 240 if (chandef->center_freq2) 241 return false; 242 243 if (control_freq + MHZ_TO_KHZ(control_width) / 2 > 244 oper_freq + MHZ_TO_KHZ(oper_width) / 2) 245 return false; 246 247 if (control_freq - MHZ_TO_KHZ(control_width) / 2 < 248 oper_freq - MHZ_TO_KHZ(oper_width) / 2) 249 return false; 250 break; 251 case NL80211_CHAN_WIDTH_80P80: 252 if (!chandef->center_freq2) 253 return false; 254 /* adjacent is not allowed -- that's a 160 MHz channel */ 255 if (chandef->center_freq1 - chandef->center_freq2 == 80 || 256 chandef->center_freq2 - chandef->center_freq1 == 80) 257 return false; 258 break; 259 default: 260 if (chandef->center_freq2) 261 return false; 262 break; 263 } 264 265 switch (chandef->width) { 266 case NL80211_CHAN_WIDTH_5: 267 case NL80211_CHAN_WIDTH_10: 268 case NL80211_CHAN_WIDTH_20: 269 case NL80211_CHAN_WIDTH_20_NOHT: 270 case NL80211_CHAN_WIDTH_1: 271 case NL80211_CHAN_WIDTH_2: 272 case NL80211_CHAN_WIDTH_4: 273 case NL80211_CHAN_WIDTH_8: 274 case NL80211_CHAN_WIDTH_16: 275 /* all checked above */ 276 break; 277 case NL80211_CHAN_WIDTH_320: 278 if (chandef->center_freq1 == control_freq + 150 || 279 chandef->center_freq1 == control_freq + 130 || 280 chandef->center_freq1 == control_freq + 110 || 281 chandef->center_freq1 == control_freq + 90 || 282 chandef->center_freq1 == control_freq - 90 || 283 chandef->center_freq1 == control_freq - 110 || 284 chandef->center_freq1 == control_freq - 130 || 285 chandef->center_freq1 == control_freq - 150) 286 break; 287 fallthrough; 288 case NL80211_CHAN_WIDTH_160: 289 if (chandef->center_freq1 == control_freq + 70 || 290 chandef->center_freq1 == control_freq + 50 || 291 chandef->center_freq1 == control_freq - 50 || 292 chandef->center_freq1 == control_freq - 70) 293 break; 294 fallthrough; 295 case NL80211_CHAN_WIDTH_80P80: 296 case NL80211_CHAN_WIDTH_80: 297 if (chandef->center_freq1 == control_freq + 30 || 298 chandef->center_freq1 == control_freq - 30) 299 break; 300 fallthrough; 301 case NL80211_CHAN_WIDTH_40: 302 if (chandef->center_freq1 == control_freq + 10 || 303 chandef->center_freq1 == control_freq - 10) 304 break; 305 fallthrough; 306 default: 307 return false; 308 } 309 310 /* channel 14 is only for IEEE 802.11b */ 311 if (chandef->center_freq1 == 2484 && 312 chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 313 return false; 314 315 if (cfg80211_chandef_is_edmg(chandef) && 316 !cfg80211_edmg_chandef_valid(chandef)) 317 return false; 318 319 return true; 320 } 321 EXPORT_SYMBOL(cfg80211_chandef_valid); 322 323 static void chandef_primary_freqs(const struct cfg80211_chan_def *c, 324 u32 *pri40, u32 *pri80, u32 *pri160) 325 { 326 int tmp; 327 328 switch (c->width) { 329 case NL80211_CHAN_WIDTH_40: 330 *pri40 = c->center_freq1; 331 *pri80 = 0; 332 *pri160 = 0; 333 break; 334 case NL80211_CHAN_WIDTH_80: 335 case NL80211_CHAN_WIDTH_80P80: 336 *pri160 = 0; 337 *pri80 = c->center_freq1; 338 /* n_P20 */ 339 tmp = (30 + c->chan->center_freq - c->center_freq1)/20; 340 /* n_P40 */ 341 tmp /= 2; 342 /* freq_P40 */ 343 *pri40 = c->center_freq1 - 20 + 40 * tmp; 344 break; 345 case NL80211_CHAN_WIDTH_160: 346 *pri160 = c->center_freq1; 347 /* n_P20 */ 348 tmp = (70 + c->chan->center_freq - c->center_freq1)/20; 349 /* n_P40 */ 350 tmp /= 2; 351 /* freq_P40 */ 352 *pri40 = c->center_freq1 - 60 + 40 * tmp; 353 /* n_P80 */ 354 tmp /= 2; 355 *pri80 = c->center_freq1 - 40 + 80 * tmp; 356 break; 357 case NL80211_CHAN_WIDTH_320: 358 /* n_P20 */ 359 tmp = (150 + c->chan->center_freq - c->center_freq1) / 20; 360 /* n_P40 */ 361 tmp /= 2; 362 /* freq_P40 */ 363 *pri40 = c->center_freq1 - 140 + 40 * tmp; 364 /* n_P80 */ 365 tmp /= 2; 366 *pri80 = c->center_freq1 - 120 + 80 * tmp; 367 /* n_P160 */ 368 tmp /= 2; 369 *pri160 = c->center_freq1 - 80 + 160 * tmp; 370 break; 371 default: 372 WARN_ON_ONCE(1); 373 } 374 } 375 376 const struct cfg80211_chan_def * 377 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, 378 const struct cfg80211_chan_def *c2) 379 { 380 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80, c1_pri160, c2_pri160; 381 382 /* If they are identical, return */ 383 if (cfg80211_chandef_identical(c1, c2)) 384 return c1; 385 386 /* otherwise, must have same control channel */ 387 if (c1->chan != c2->chan) 388 return NULL; 389 390 /* 391 * If they have the same width, but aren't identical, 392 * then they can't be compatible. 393 */ 394 if (c1->width == c2->width) 395 return NULL; 396 397 /* 398 * can't be compatible if one of them is 5 or 10 MHz, 399 * but they don't have the same width. 400 */ 401 if (c1->width == NL80211_CHAN_WIDTH_5 || 402 c1->width == NL80211_CHAN_WIDTH_10 || 403 c2->width == NL80211_CHAN_WIDTH_5 || 404 c2->width == NL80211_CHAN_WIDTH_10) 405 return NULL; 406 407 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || 408 c1->width == NL80211_CHAN_WIDTH_20) 409 return c2; 410 411 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || 412 c2->width == NL80211_CHAN_WIDTH_20) 413 return c1; 414 415 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80, &c1_pri160); 416 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80, &c2_pri160); 417 418 if (c1_pri40 != c2_pri40) 419 return NULL; 420 421 if (c1->width == NL80211_CHAN_WIDTH_40) 422 return c2; 423 424 if (c2->width == NL80211_CHAN_WIDTH_40) 425 return c1; 426 427 if (c1_pri80 != c2_pri80) 428 return NULL; 429 430 if (c1->width == NL80211_CHAN_WIDTH_80 && 431 c2->width > NL80211_CHAN_WIDTH_80) 432 return c2; 433 434 if (c2->width == NL80211_CHAN_WIDTH_80 && 435 c1->width > NL80211_CHAN_WIDTH_80) 436 return c1; 437 438 WARN_ON(!c1_pri160 && !c2_pri160); 439 if (c1_pri160 && c2_pri160 && c1_pri160 != c2_pri160) 440 return NULL; 441 442 if (c1->width > c2->width) 443 return c1; 444 return c2; 445 } 446 EXPORT_SYMBOL(cfg80211_chandef_compatible); 447 448 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, 449 u32 bandwidth, 450 enum nl80211_dfs_state dfs_state) 451 { 452 struct ieee80211_channel *c; 453 u32 freq; 454 455 for (freq = center_freq - bandwidth/2 + 10; 456 freq <= center_freq + bandwidth/2 - 10; 457 freq += 20) { 458 c = ieee80211_get_channel(wiphy, freq); 459 if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) 460 continue; 461 462 c->dfs_state = dfs_state; 463 c->dfs_state_entered = jiffies; 464 } 465 } 466 467 void cfg80211_set_dfs_state(struct wiphy *wiphy, 468 const struct cfg80211_chan_def *chandef, 469 enum nl80211_dfs_state dfs_state) 470 { 471 int width; 472 473 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 474 return; 475 476 width = cfg80211_chandef_get_width(chandef); 477 if (width < 0) 478 return; 479 480 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1, 481 width, dfs_state); 482 483 if (!chandef->center_freq2) 484 return; 485 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2, 486 width, dfs_state); 487 } 488 489 static u32 cfg80211_get_start_freq(u32 center_freq, 490 u32 bandwidth) 491 { 492 u32 start_freq; 493 494 bandwidth = MHZ_TO_KHZ(bandwidth); 495 if (bandwidth <= MHZ_TO_KHZ(20)) 496 start_freq = center_freq; 497 else 498 start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10); 499 500 return start_freq; 501 } 502 503 static u32 cfg80211_get_end_freq(u32 center_freq, 504 u32 bandwidth) 505 { 506 u32 end_freq; 507 508 bandwidth = MHZ_TO_KHZ(bandwidth); 509 if (bandwidth <= MHZ_TO_KHZ(20)) 510 end_freq = center_freq; 511 else 512 end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10); 513 514 return end_freq; 515 } 516 517 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, 518 u32 center_freq, 519 u32 bandwidth) 520 { 521 struct ieee80211_channel *c; 522 u32 freq, start_freq, end_freq; 523 524 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 525 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 526 527 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 528 c = ieee80211_get_channel_khz(wiphy, freq); 529 if (!c) 530 return -EINVAL; 531 532 if (c->flags & IEEE80211_CHAN_RADAR) 533 return 1; 534 } 535 return 0; 536 } 537 538 539 int cfg80211_chandef_dfs_required(struct wiphy *wiphy, 540 const struct cfg80211_chan_def *chandef, 541 enum nl80211_iftype iftype) 542 { 543 int width; 544 int ret; 545 546 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 547 return -EINVAL; 548 549 switch (iftype) { 550 case NL80211_IFTYPE_ADHOC: 551 case NL80211_IFTYPE_AP: 552 case NL80211_IFTYPE_P2P_GO: 553 case NL80211_IFTYPE_MESH_POINT: 554 width = cfg80211_chandef_get_width(chandef); 555 if (width < 0) 556 return -EINVAL; 557 558 ret = cfg80211_get_chans_dfs_required(wiphy, 559 ieee80211_chandef_to_khz(chandef), 560 width); 561 if (ret < 0) 562 return ret; 563 else if (ret > 0) 564 return BIT(chandef->width); 565 566 if (!chandef->center_freq2) 567 return 0; 568 569 ret = cfg80211_get_chans_dfs_required(wiphy, 570 MHZ_TO_KHZ(chandef->center_freq2), 571 width); 572 if (ret < 0) 573 return ret; 574 else if (ret > 0) 575 return BIT(chandef->width); 576 577 break; 578 case NL80211_IFTYPE_STATION: 579 case NL80211_IFTYPE_OCB: 580 case NL80211_IFTYPE_P2P_CLIENT: 581 case NL80211_IFTYPE_MONITOR: 582 case NL80211_IFTYPE_AP_VLAN: 583 case NL80211_IFTYPE_P2P_DEVICE: 584 case NL80211_IFTYPE_NAN: 585 break; 586 case NL80211_IFTYPE_WDS: 587 case NL80211_IFTYPE_UNSPECIFIED: 588 case NUM_NL80211_IFTYPES: 589 WARN_ON(1); 590 } 591 592 return 0; 593 } 594 EXPORT_SYMBOL(cfg80211_chandef_dfs_required); 595 596 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, 597 u32 center_freq, 598 u32 bandwidth) 599 { 600 struct ieee80211_channel *c; 601 u32 freq, start_freq, end_freq; 602 int count = 0; 603 604 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 605 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 606 607 /* 608 * Check entire range of channels for the bandwidth. 609 * Check all channels are DFS channels (DFS_USABLE or 610 * DFS_AVAILABLE). Return number of usable channels 611 * (require CAC). Allow DFS and non-DFS channel mix. 612 */ 613 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 614 c = ieee80211_get_channel_khz(wiphy, freq); 615 if (!c) 616 return -EINVAL; 617 618 if (c->flags & IEEE80211_CHAN_DISABLED) 619 return -EINVAL; 620 621 if (c->flags & IEEE80211_CHAN_RADAR) { 622 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) 623 return -EINVAL; 624 625 if (c->dfs_state == NL80211_DFS_USABLE) 626 count++; 627 } 628 } 629 630 return count; 631 } 632 633 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, 634 const struct cfg80211_chan_def *chandef) 635 { 636 int width; 637 int r1, r2 = 0; 638 639 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 640 return false; 641 642 width = cfg80211_chandef_get_width(chandef); 643 if (width < 0) 644 return false; 645 646 r1 = cfg80211_get_chans_dfs_usable(wiphy, 647 MHZ_TO_KHZ(chandef->center_freq1), 648 width); 649 650 if (r1 < 0) 651 return false; 652 653 switch (chandef->width) { 654 case NL80211_CHAN_WIDTH_80P80: 655 WARN_ON(!chandef->center_freq2); 656 r2 = cfg80211_get_chans_dfs_usable(wiphy, 657 MHZ_TO_KHZ(chandef->center_freq2), 658 width); 659 if (r2 < 0) 660 return false; 661 break; 662 default: 663 WARN_ON(chandef->center_freq2); 664 break; 665 } 666 667 return (r1 + r2 > 0); 668 } 669 670 /* 671 * Checks if center frequency of chan falls with in the bandwidth 672 * range of chandef. 673 */ 674 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef, 675 struct ieee80211_channel *chan) 676 { 677 int width; 678 u32 freq; 679 680 if (chandef->chan->center_freq == chan->center_freq) 681 return true; 682 683 width = cfg80211_chandef_get_width(chandef); 684 if (width <= 20) 685 return false; 686 687 for (freq = chandef->center_freq1 - width / 2 + 10; 688 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) { 689 if (chan->center_freq == freq) 690 return true; 691 } 692 693 if (!chandef->center_freq2) 694 return false; 695 696 for (freq = chandef->center_freq2 - width / 2 + 10; 697 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) { 698 if (chan->center_freq == freq) 699 return true; 700 } 701 702 return false; 703 } 704 705 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) 706 { 707 bool active = false; 708 709 ASSERT_WDEV_LOCK(wdev); 710 711 if (!wdev->chandef.chan) 712 return false; 713 714 switch (wdev->iftype) { 715 case NL80211_IFTYPE_AP: 716 case NL80211_IFTYPE_P2P_GO: 717 active = wdev->beacon_interval != 0; 718 break; 719 case NL80211_IFTYPE_ADHOC: 720 active = wdev->ssid_len != 0; 721 break; 722 case NL80211_IFTYPE_MESH_POINT: 723 active = wdev->mesh_id_len != 0; 724 break; 725 case NL80211_IFTYPE_STATION: 726 case NL80211_IFTYPE_OCB: 727 case NL80211_IFTYPE_P2P_CLIENT: 728 case NL80211_IFTYPE_MONITOR: 729 case NL80211_IFTYPE_AP_VLAN: 730 case NL80211_IFTYPE_P2P_DEVICE: 731 /* Can NAN type be considered as beaconing interface? */ 732 case NL80211_IFTYPE_NAN: 733 break; 734 case NL80211_IFTYPE_UNSPECIFIED: 735 case NL80211_IFTYPE_WDS: 736 case NUM_NL80211_IFTYPES: 737 WARN_ON(1); 738 } 739 740 return active; 741 } 742 743 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy, 744 struct ieee80211_channel *chan) 745 { 746 struct wireless_dev *wdev; 747 748 list_for_each_entry(wdev, &wiphy->wdev_list, list) { 749 wdev_lock(wdev); 750 if (!cfg80211_beaconing_iface_active(wdev)) { 751 wdev_unlock(wdev); 752 continue; 753 } 754 755 if (cfg80211_is_sub_chan(&wdev->chandef, chan)) { 756 wdev_unlock(wdev); 757 return true; 758 } 759 wdev_unlock(wdev); 760 } 761 762 return false; 763 } 764 765 static bool 766 cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev, 767 struct ieee80211_channel *channel) 768 { 769 if (!rdev->background_radar_wdev) 770 return false; 771 772 if (!cfg80211_chandef_valid(&rdev->background_radar_chandef)) 773 return false; 774 775 return cfg80211_is_sub_chan(&rdev->background_radar_chandef, channel); 776 } 777 778 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, 779 struct ieee80211_channel *chan) 780 { 781 struct cfg80211_registered_device *rdev; 782 783 ASSERT_RTNL(); 784 785 if (!(chan->flags & IEEE80211_CHAN_RADAR)) 786 return false; 787 788 list_for_each_entry(rdev, &cfg80211_rdev_list, list) { 789 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy)) 790 continue; 791 792 if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan)) 793 return true; 794 795 if (cfg80211_offchan_chain_is_active(rdev, chan)) 796 return true; 797 } 798 799 return false; 800 } 801 802 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, 803 u32 center_freq, 804 u32 bandwidth) 805 { 806 struct ieee80211_channel *c; 807 u32 freq, start_freq, end_freq; 808 bool dfs_offload; 809 810 dfs_offload = wiphy_ext_feature_isset(wiphy, 811 NL80211_EXT_FEATURE_DFS_OFFLOAD); 812 813 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 814 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 815 816 /* 817 * Check entire range of channels for the bandwidth. 818 * If any channel in between is disabled or has not 819 * had gone through CAC return false 820 */ 821 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 822 c = ieee80211_get_channel_khz(wiphy, freq); 823 if (!c) 824 return false; 825 826 if (c->flags & IEEE80211_CHAN_DISABLED) 827 return false; 828 829 if ((c->flags & IEEE80211_CHAN_RADAR) && 830 (c->dfs_state != NL80211_DFS_AVAILABLE) && 831 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload)) 832 return false; 833 } 834 835 return true; 836 } 837 838 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 839 const struct cfg80211_chan_def *chandef) 840 { 841 int width; 842 int r; 843 844 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 845 return false; 846 847 width = cfg80211_chandef_get_width(chandef); 848 if (width < 0) 849 return false; 850 851 r = cfg80211_get_chans_dfs_available(wiphy, 852 MHZ_TO_KHZ(chandef->center_freq1), 853 width); 854 855 /* If any of channels unavailable for cf1 just return */ 856 if (!r) 857 return r; 858 859 switch (chandef->width) { 860 case NL80211_CHAN_WIDTH_80P80: 861 WARN_ON(!chandef->center_freq2); 862 r = cfg80211_get_chans_dfs_available(wiphy, 863 MHZ_TO_KHZ(chandef->center_freq2), 864 width); 865 break; 866 default: 867 WARN_ON(chandef->center_freq2); 868 break; 869 } 870 871 return r; 872 } 873 874 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, 875 u32 center_freq, 876 u32 bandwidth) 877 { 878 struct ieee80211_channel *c; 879 u32 start_freq, end_freq, freq; 880 unsigned int dfs_cac_ms = 0; 881 882 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 883 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 884 885 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 886 c = ieee80211_get_channel_khz(wiphy, freq); 887 if (!c) 888 return 0; 889 890 if (c->flags & IEEE80211_CHAN_DISABLED) 891 return 0; 892 893 if (!(c->flags & IEEE80211_CHAN_RADAR)) 894 continue; 895 896 if (c->dfs_cac_ms > dfs_cac_ms) 897 dfs_cac_ms = c->dfs_cac_ms; 898 } 899 900 return dfs_cac_ms; 901 } 902 903 unsigned int 904 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 905 const struct cfg80211_chan_def *chandef) 906 { 907 int width; 908 unsigned int t1 = 0, t2 = 0; 909 910 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 911 return 0; 912 913 width = cfg80211_chandef_get_width(chandef); 914 if (width < 0) 915 return 0; 916 917 t1 = cfg80211_get_chans_dfs_cac_time(wiphy, 918 MHZ_TO_KHZ(chandef->center_freq1), 919 width); 920 921 if (!chandef->center_freq2) 922 return t1; 923 924 t2 = cfg80211_get_chans_dfs_cac_time(wiphy, 925 MHZ_TO_KHZ(chandef->center_freq2), 926 width); 927 928 return max(t1, t2); 929 } 930 931 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, 932 u32 center_freq, u32 bandwidth, 933 u32 prohibited_flags) 934 { 935 struct ieee80211_channel *c; 936 u32 freq, start_freq, end_freq; 937 938 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 939 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 940 941 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 942 c = ieee80211_get_channel_khz(wiphy, freq); 943 if (!c || c->flags & prohibited_flags) 944 return false; 945 } 946 947 return true; 948 } 949 950 /* check if the operating channels are valid and supported */ 951 static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels, 952 enum ieee80211_edmg_bw_config edmg_bw_config, 953 int primary_channel, 954 struct ieee80211_edmg *edmg_cap) 955 { 956 struct ieee80211_channel *chan; 957 int i, freq; 958 int channels_counter = 0; 959 960 if (!edmg_channels && !edmg_bw_config) 961 return true; 962 963 if ((!edmg_channels && edmg_bw_config) || 964 (edmg_channels && !edmg_bw_config)) 965 return false; 966 967 if (!(edmg_channels & BIT(primary_channel - 1))) 968 return false; 969 970 /* 60GHz channels 1..6 */ 971 for (i = 0; i < 6; i++) { 972 if (!(edmg_channels & BIT(i))) 973 continue; 974 975 if (!(edmg_cap->channels & BIT(i))) 976 return false; 977 978 channels_counter++; 979 980 freq = ieee80211_channel_to_frequency(i + 1, 981 NL80211_BAND_60GHZ); 982 chan = ieee80211_get_channel(wiphy, freq); 983 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) 984 return false; 985 } 986 987 /* IEEE802.11 allows max 4 channels */ 988 if (channels_counter > 4) 989 return false; 990 991 /* check bw_config is a subset of what driver supports 992 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13) 993 */ 994 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4)) 995 return false; 996 997 if (edmg_bw_config > edmg_cap->bw_config) 998 return false; 999 1000 return true; 1001 } 1002 1003 bool cfg80211_chandef_usable(struct wiphy *wiphy, 1004 const struct cfg80211_chan_def *chandef, 1005 u32 prohibited_flags) 1006 { 1007 struct ieee80211_sta_ht_cap *ht_cap; 1008 struct ieee80211_sta_vht_cap *vht_cap; 1009 struct ieee80211_edmg *edmg_cap; 1010 u32 width, control_freq, cap; 1011 bool ext_nss_cap, support_80_80 = false, support_320 = false; 1012 const struct ieee80211_sband_iftype_data *iftd; 1013 struct ieee80211_supported_band *sband; 1014 int i; 1015 1016 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 1017 return false; 1018 1019 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 1020 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 1021 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap; 1022 ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) & 1023 IEEE80211_VHT_EXT_NSS_BW_CAPABLE; 1024 1025 if (edmg_cap->channels && 1026 !cfg80211_edmg_usable(wiphy, 1027 chandef->edmg.channels, 1028 chandef->edmg.bw_config, 1029 chandef->chan->hw_value, 1030 edmg_cap)) 1031 return false; 1032 1033 control_freq = chandef->chan->center_freq; 1034 1035 switch (chandef->width) { 1036 case NL80211_CHAN_WIDTH_1: 1037 width = 1; 1038 break; 1039 case NL80211_CHAN_WIDTH_2: 1040 width = 2; 1041 break; 1042 case NL80211_CHAN_WIDTH_4: 1043 width = 4; 1044 break; 1045 case NL80211_CHAN_WIDTH_8: 1046 width = 8; 1047 break; 1048 case NL80211_CHAN_WIDTH_16: 1049 width = 16; 1050 break; 1051 case NL80211_CHAN_WIDTH_5: 1052 width = 5; 1053 break; 1054 case NL80211_CHAN_WIDTH_10: 1055 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 1056 width = 10; 1057 break; 1058 case NL80211_CHAN_WIDTH_20: 1059 if (!ht_cap->ht_supported && 1060 chandef->chan->band != NL80211_BAND_6GHZ) 1061 return false; 1062 fallthrough; 1063 case NL80211_CHAN_WIDTH_20_NOHT: 1064 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 1065 width = 20; 1066 break; 1067 case NL80211_CHAN_WIDTH_40: 1068 width = 40; 1069 if (chandef->chan->band == NL80211_BAND_6GHZ) 1070 break; 1071 if (!ht_cap->ht_supported) 1072 return false; 1073 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 1074 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 1075 return false; 1076 if (chandef->center_freq1 < control_freq && 1077 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 1078 return false; 1079 if (chandef->center_freq1 > control_freq && 1080 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 1081 return false; 1082 break; 1083 case NL80211_CHAN_WIDTH_80P80: 1084 cap = vht_cap->cap; 1085 support_80_80 = 1086 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) || 1087 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 1088 cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) || 1089 (ext_nss_cap && 1090 u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1); 1091 if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80) 1092 return false; 1093 fallthrough; 1094 case NL80211_CHAN_WIDTH_80: 1095 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 1096 width = 80; 1097 if (chandef->chan->band == NL80211_BAND_6GHZ) 1098 break; 1099 if (!vht_cap->vht_supported) 1100 return false; 1101 break; 1102 case NL80211_CHAN_WIDTH_160: 1103 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 1104 width = 160; 1105 if (chandef->chan->band == NL80211_BAND_6GHZ) 1106 break; 1107 if (!vht_cap->vht_supported) 1108 return false; 1109 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 1110 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 1111 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ && 1112 !(ext_nss_cap && 1113 (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))) 1114 return false; 1115 break; 1116 case NL80211_CHAN_WIDTH_320: 1117 prohibited_flags |= IEEE80211_CHAN_NO_320MHZ; 1118 width = 320; 1119 1120 if (chandef->chan->band != NL80211_BAND_6GHZ) 1121 return false; 1122 1123 sband = wiphy->bands[NL80211_BAND_6GHZ]; 1124 if (!sband) 1125 return false; 1126 1127 for (i = 0; i < sband->n_iftype_data; i++) { 1128 iftd = &sband->iftype_data[i]; 1129 if (!iftd->eht_cap.has_eht) 1130 continue; 1131 1132 if (iftd->eht_cap.eht_cap_elem.phy_cap_info[0] & 1133 IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) { 1134 support_320 = true; 1135 break; 1136 } 1137 } 1138 1139 if (!support_320) 1140 return false; 1141 break; 1142 default: 1143 WARN_ON_ONCE(1); 1144 return false; 1145 } 1146 1147 /* 1148 * TODO: What if there are only certain 80/160/80+80 MHz channels 1149 * allowed by the driver, or only certain combinations? 1150 * For 40 MHz the driver can set the NO_HT40 flags, but for 1151 * 80/160 MHz and in particular 80+80 MHz this isn't really 1152 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 1153 * no way to cover 80+80 MHz or more complex restrictions. 1154 * Note that such restrictions also need to be advertised to 1155 * userspace, for example for P2P channel selection. 1156 */ 1157 1158 if (width > 20) 1159 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 1160 1161 /* 5 and 10 MHz are only defined for the OFDM PHY */ 1162 if (width < 20) 1163 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 1164 1165 1166 if (!cfg80211_secondary_chans_ok(wiphy, 1167 ieee80211_chandef_to_khz(chandef), 1168 width, prohibited_flags)) 1169 return false; 1170 1171 if (!chandef->center_freq2) 1172 return true; 1173 return cfg80211_secondary_chans_ok(wiphy, 1174 MHZ_TO_KHZ(chandef->center_freq2), 1175 width, prohibited_flags); 1176 } 1177 EXPORT_SYMBOL(cfg80211_chandef_usable); 1178 1179 /* 1180 * Check if the channel can be used under permissive conditions mandated by 1181 * some regulatory bodies, i.e., the channel is marked with 1182 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface 1183 * associated to an AP on the same channel or on the same UNII band 1184 * (assuming that the AP is an authorized master). 1185 * In addition allow operation on a channel on which indoor operation is 1186 * allowed, iff we are currently operating in an indoor environment. 1187 */ 1188 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 1189 enum nl80211_iftype iftype, 1190 struct ieee80211_channel *chan) 1191 { 1192 struct wireless_dev *wdev; 1193 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1194 1195 lockdep_assert_held(&rdev->wiphy.mtx); 1196 1197 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || 1198 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 1199 return false; 1200 1201 /* only valid for GO and TDLS off-channel (station/p2p-CL) */ 1202 if (iftype != NL80211_IFTYPE_P2P_GO && 1203 iftype != NL80211_IFTYPE_STATION && 1204 iftype != NL80211_IFTYPE_P2P_CLIENT) 1205 return false; 1206 1207 if (regulatory_indoor_allowed() && 1208 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1209 return true; 1210 1211 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) 1212 return false; 1213 1214 /* 1215 * Generally, it is possible to rely on another device/driver to allow 1216 * the IR concurrent relaxation, however, since the device can further 1217 * enforce the relaxation (by doing a similar verifications as this), 1218 * and thus fail the GO instantiation, consider only the interfaces of 1219 * the current registered device. 1220 */ 1221 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 1222 struct ieee80211_channel *other_chan = NULL; 1223 int r1, r2; 1224 1225 wdev_lock(wdev); 1226 if (wdev->iftype == NL80211_IFTYPE_STATION && 1227 wdev->current_bss) 1228 other_chan = wdev->current_bss->pub.channel; 1229 1230 /* 1231 * If a GO already operates on the same GO_CONCURRENT channel, 1232 * this one (maybe the same one) can beacon as well. We allow 1233 * the operation even if the station we relied on with 1234 * GO_CONCURRENT is disconnected now. But then we must make sure 1235 * we're not outdoor on an indoor-only channel. 1236 */ 1237 if (iftype == NL80211_IFTYPE_P2P_GO && 1238 wdev->iftype == NL80211_IFTYPE_P2P_GO && 1239 wdev->beacon_interval && 1240 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1241 other_chan = wdev->chandef.chan; 1242 wdev_unlock(wdev); 1243 1244 if (!other_chan) 1245 continue; 1246 1247 if (chan == other_chan) 1248 return true; 1249 1250 if (chan->band != NL80211_BAND_5GHZ && 1251 chan->band != NL80211_BAND_6GHZ) 1252 continue; 1253 1254 r1 = cfg80211_get_unii(chan->center_freq); 1255 r2 = cfg80211_get_unii(other_chan->center_freq); 1256 1257 if (r1 != -EINVAL && r1 == r2) { 1258 /* 1259 * At some locations channels 149-165 are considered a 1260 * bundle, but at other locations, e.g., Indonesia, 1261 * channels 149-161 are considered a bundle while 1262 * channel 165 is left out and considered to be in a 1263 * different bundle. Thus, in case that there is a 1264 * station interface connected to an AP on channel 165, 1265 * it is assumed that channels 149-161 are allowed for 1266 * GO operations. However, having a station interface 1267 * connected to an AP on channels 149-161, does not 1268 * allow GO operation on channel 165. 1269 */ 1270 if (chan->center_freq == 5825 && 1271 other_chan->center_freq != 5825) 1272 continue; 1273 return true; 1274 } 1275 } 1276 1277 return false; 1278 } 1279 1280 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, 1281 struct cfg80211_chan_def *chandef, 1282 enum nl80211_iftype iftype, 1283 bool check_no_ir) 1284 { 1285 bool res; 1286 u32 prohibited_flags = IEEE80211_CHAN_DISABLED | 1287 IEEE80211_CHAN_RADAR; 1288 1289 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 1290 1291 if (check_no_ir) 1292 prohibited_flags |= IEEE80211_CHAN_NO_IR; 1293 1294 if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && 1295 cfg80211_chandef_dfs_available(wiphy, chandef)) { 1296 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 1297 prohibited_flags = IEEE80211_CHAN_DISABLED; 1298 } 1299 1300 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); 1301 1302 trace_cfg80211_return_bool(res); 1303 return res; 1304 } 1305 1306 bool cfg80211_reg_can_beacon(struct wiphy *wiphy, 1307 struct cfg80211_chan_def *chandef, 1308 enum nl80211_iftype iftype) 1309 { 1310 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); 1311 } 1312 EXPORT_SYMBOL(cfg80211_reg_can_beacon); 1313 1314 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, 1315 struct cfg80211_chan_def *chandef, 1316 enum nl80211_iftype iftype) 1317 { 1318 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1319 bool check_no_ir; 1320 1321 lockdep_assert_held(&rdev->wiphy.mtx); 1322 1323 /* 1324 * Under certain conditions suggested by some regulatory bodies a 1325 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag 1326 * only if such relaxations are not enabled and the conditions are not 1327 * met. 1328 */ 1329 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, 1330 chandef->chan); 1331 1332 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 1333 } 1334 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); 1335 1336 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 1337 struct cfg80211_chan_def *chandef) 1338 { 1339 if (!rdev->ops->set_monitor_channel) 1340 return -EOPNOTSUPP; 1341 if (!cfg80211_has_monitors_only(rdev)) 1342 return -EBUSY; 1343 1344 return rdev_set_monitor_channel(rdev, chandef); 1345 } 1346 1347 bool cfg80211_any_usable_channels(struct wiphy *wiphy, 1348 unsigned long sband_mask, 1349 u32 prohibited_flags) 1350 { 1351 int idx; 1352 1353 prohibited_flags |= IEEE80211_CHAN_DISABLED; 1354 1355 for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) { 1356 struct ieee80211_supported_band *sband = wiphy->bands[idx]; 1357 int chanidx; 1358 1359 if (!sband) 1360 continue; 1361 1362 for (chanidx = 0; chanidx < sband->n_channels; chanidx++) { 1363 struct ieee80211_channel *chan; 1364 1365 chan = &sband->channels[chanidx]; 1366 1367 if (chan->flags & prohibited_flags) 1368 continue; 1369 1370 return true; 1371 } 1372 } 1373 1374 return false; 1375 } 1376 EXPORT_SYMBOL(cfg80211_any_usable_channels); 1377