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 2018-2023 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 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 EXPORT_SYMBOL(nl80211_chan_width_to_mhz); 194 195 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) 196 { 197 return nl80211_chan_width_to_mhz(c->width); 198 } 199 200 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) 201 { 202 u32 control_freq, oper_freq; 203 int oper_width, control_width; 204 205 if (!chandef->chan) 206 return false; 207 208 if (chandef->freq1_offset >= 1000) 209 return false; 210 211 control_freq = chandef->chan->center_freq; 212 213 switch (chandef->width) { 214 case NL80211_CHAN_WIDTH_5: 215 case NL80211_CHAN_WIDTH_10: 216 case NL80211_CHAN_WIDTH_20: 217 case NL80211_CHAN_WIDTH_20_NOHT: 218 if (ieee80211_chandef_to_khz(chandef) != 219 ieee80211_channel_to_khz(chandef->chan)) 220 return false; 221 if (chandef->center_freq2) 222 return false; 223 break; 224 case NL80211_CHAN_WIDTH_1: 225 case NL80211_CHAN_WIDTH_2: 226 case NL80211_CHAN_WIDTH_4: 227 case NL80211_CHAN_WIDTH_8: 228 case NL80211_CHAN_WIDTH_16: 229 if (chandef->chan->band != NL80211_BAND_S1GHZ) 230 return false; 231 232 control_freq = ieee80211_channel_to_khz(chandef->chan); 233 oper_freq = ieee80211_chandef_to_khz(chandef); 234 control_width = nl80211_chan_width_to_mhz( 235 ieee80211_s1g_channel_width( 236 chandef->chan)); 237 oper_width = cfg80211_chandef_get_width(chandef); 238 239 if (oper_width < 0 || control_width < 0) 240 return false; 241 if (chandef->center_freq2) 242 return false; 243 244 if (control_freq + MHZ_TO_KHZ(control_width) / 2 > 245 oper_freq + MHZ_TO_KHZ(oper_width) / 2) 246 return false; 247 248 if (control_freq - MHZ_TO_KHZ(control_width) / 2 < 249 oper_freq - MHZ_TO_KHZ(oper_width) / 2) 250 return false; 251 break; 252 case NL80211_CHAN_WIDTH_80P80: 253 if (!chandef->center_freq2) 254 return false; 255 /* adjacent is not allowed -- that's a 160 MHz channel */ 256 if (chandef->center_freq1 - chandef->center_freq2 == 80 || 257 chandef->center_freq2 - chandef->center_freq1 == 80) 258 return false; 259 break; 260 default: 261 if (chandef->center_freq2) 262 return false; 263 break; 264 } 265 266 switch (chandef->width) { 267 case NL80211_CHAN_WIDTH_5: 268 case NL80211_CHAN_WIDTH_10: 269 case NL80211_CHAN_WIDTH_20: 270 case NL80211_CHAN_WIDTH_20_NOHT: 271 case NL80211_CHAN_WIDTH_1: 272 case NL80211_CHAN_WIDTH_2: 273 case NL80211_CHAN_WIDTH_4: 274 case NL80211_CHAN_WIDTH_8: 275 case NL80211_CHAN_WIDTH_16: 276 /* all checked above */ 277 break; 278 case NL80211_CHAN_WIDTH_320: 279 if (chandef->center_freq1 == control_freq + 150 || 280 chandef->center_freq1 == control_freq + 130 || 281 chandef->center_freq1 == control_freq + 110 || 282 chandef->center_freq1 == control_freq + 90 || 283 chandef->center_freq1 == control_freq - 90 || 284 chandef->center_freq1 == control_freq - 110 || 285 chandef->center_freq1 == control_freq - 130 || 286 chandef->center_freq1 == control_freq - 150) 287 break; 288 fallthrough; 289 case NL80211_CHAN_WIDTH_160: 290 if (chandef->center_freq1 == control_freq + 70 || 291 chandef->center_freq1 == control_freq + 50 || 292 chandef->center_freq1 == control_freq - 50 || 293 chandef->center_freq1 == control_freq - 70) 294 break; 295 fallthrough; 296 case NL80211_CHAN_WIDTH_80P80: 297 case NL80211_CHAN_WIDTH_80: 298 if (chandef->center_freq1 == control_freq + 30 || 299 chandef->center_freq1 == control_freq - 30) 300 break; 301 fallthrough; 302 case NL80211_CHAN_WIDTH_40: 303 if (chandef->center_freq1 == control_freq + 10 || 304 chandef->center_freq1 == control_freq - 10) 305 break; 306 fallthrough; 307 default: 308 return false; 309 } 310 311 /* channel 14 is only for IEEE 802.11b */ 312 if (chandef->center_freq1 == 2484 && 313 chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 314 return false; 315 316 if (cfg80211_chandef_is_edmg(chandef) && 317 !cfg80211_edmg_chandef_valid(chandef)) 318 return false; 319 320 return true; 321 } 322 EXPORT_SYMBOL(cfg80211_chandef_valid); 323 324 static void chandef_primary_freqs(const struct cfg80211_chan_def *c, 325 u32 *pri40, u32 *pri80, u32 *pri160) 326 { 327 int tmp; 328 329 switch (c->width) { 330 case NL80211_CHAN_WIDTH_40: 331 *pri40 = c->center_freq1; 332 *pri80 = 0; 333 *pri160 = 0; 334 break; 335 case NL80211_CHAN_WIDTH_80: 336 case NL80211_CHAN_WIDTH_80P80: 337 *pri160 = 0; 338 *pri80 = c->center_freq1; 339 /* n_P20 */ 340 tmp = (30 + c->chan->center_freq - c->center_freq1)/20; 341 /* n_P40 */ 342 tmp /= 2; 343 /* freq_P40 */ 344 *pri40 = c->center_freq1 - 20 + 40 * tmp; 345 break; 346 case NL80211_CHAN_WIDTH_160: 347 *pri160 = c->center_freq1; 348 /* n_P20 */ 349 tmp = (70 + c->chan->center_freq - c->center_freq1)/20; 350 /* n_P40 */ 351 tmp /= 2; 352 /* freq_P40 */ 353 *pri40 = c->center_freq1 - 60 + 40 * tmp; 354 /* n_P80 */ 355 tmp /= 2; 356 *pri80 = c->center_freq1 - 40 + 80 * tmp; 357 break; 358 case NL80211_CHAN_WIDTH_320: 359 /* n_P20 */ 360 tmp = (150 + c->chan->center_freq - c->center_freq1) / 20; 361 /* n_P40 */ 362 tmp /= 2; 363 /* freq_P40 */ 364 *pri40 = c->center_freq1 - 140 + 40 * tmp; 365 /* n_P80 */ 366 tmp /= 2; 367 *pri80 = c->center_freq1 - 120 + 80 * tmp; 368 /* n_P160 */ 369 tmp /= 2; 370 *pri160 = c->center_freq1 - 80 + 160 * tmp; 371 break; 372 default: 373 WARN_ON_ONCE(1); 374 } 375 } 376 377 const struct cfg80211_chan_def * 378 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, 379 const struct cfg80211_chan_def *c2) 380 { 381 u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80, c1_pri160, c2_pri160; 382 383 /* If they are identical, return */ 384 if (cfg80211_chandef_identical(c1, c2)) 385 return c1; 386 387 /* otherwise, must have same control channel */ 388 if (c1->chan != c2->chan) 389 return NULL; 390 391 /* 392 * If they have the same width, but aren't identical, 393 * then they can't be compatible. 394 */ 395 if (c1->width == c2->width) 396 return NULL; 397 398 /* 399 * can't be compatible if one of them is 5 or 10 MHz, 400 * but they don't have the same width. 401 */ 402 if (c1->width == NL80211_CHAN_WIDTH_5 || 403 c1->width == NL80211_CHAN_WIDTH_10 || 404 c2->width == NL80211_CHAN_WIDTH_5 || 405 c2->width == NL80211_CHAN_WIDTH_10) 406 return NULL; 407 408 if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || 409 c1->width == NL80211_CHAN_WIDTH_20) 410 return c2; 411 412 if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || 413 c2->width == NL80211_CHAN_WIDTH_20) 414 return c1; 415 416 chandef_primary_freqs(c1, &c1_pri40, &c1_pri80, &c1_pri160); 417 chandef_primary_freqs(c2, &c2_pri40, &c2_pri80, &c2_pri160); 418 419 if (c1_pri40 != c2_pri40) 420 return NULL; 421 422 if (c1->width == NL80211_CHAN_WIDTH_40) 423 return c2; 424 425 if (c2->width == NL80211_CHAN_WIDTH_40) 426 return c1; 427 428 if (c1_pri80 != c2_pri80) 429 return NULL; 430 431 if (c1->width == NL80211_CHAN_WIDTH_80 && 432 c2->width > NL80211_CHAN_WIDTH_80) 433 return c2; 434 435 if (c2->width == NL80211_CHAN_WIDTH_80 && 436 c1->width > NL80211_CHAN_WIDTH_80) 437 return c1; 438 439 WARN_ON(!c1_pri160 && !c2_pri160); 440 if (c1_pri160 && c2_pri160 && c1_pri160 != c2_pri160) 441 return NULL; 442 443 if (c1->width > c2->width) 444 return c1; 445 return c2; 446 } 447 EXPORT_SYMBOL(cfg80211_chandef_compatible); 448 449 static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, 450 u32 bandwidth, 451 enum nl80211_dfs_state dfs_state) 452 { 453 struct ieee80211_channel *c; 454 u32 freq; 455 456 for (freq = center_freq - bandwidth/2 + 10; 457 freq <= center_freq + bandwidth/2 - 10; 458 freq += 20) { 459 c = ieee80211_get_channel(wiphy, freq); 460 if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) 461 continue; 462 463 c->dfs_state = dfs_state; 464 c->dfs_state_entered = jiffies; 465 } 466 } 467 468 void cfg80211_set_dfs_state(struct wiphy *wiphy, 469 const struct cfg80211_chan_def *chandef, 470 enum nl80211_dfs_state dfs_state) 471 { 472 int width; 473 474 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 475 return; 476 477 width = cfg80211_chandef_get_width(chandef); 478 if (width < 0) 479 return; 480 481 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1, 482 width, dfs_state); 483 484 if (!chandef->center_freq2) 485 return; 486 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2, 487 width, dfs_state); 488 } 489 490 static u32 cfg80211_get_start_freq(u32 center_freq, 491 u32 bandwidth) 492 { 493 u32 start_freq; 494 495 bandwidth = MHZ_TO_KHZ(bandwidth); 496 if (bandwidth <= MHZ_TO_KHZ(20)) 497 start_freq = center_freq; 498 else 499 start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10); 500 501 return start_freq; 502 } 503 504 static u32 cfg80211_get_end_freq(u32 center_freq, 505 u32 bandwidth) 506 { 507 u32 end_freq; 508 509 bandwidth = MHZ_TO_KHZ(bandwidth); 510 if (bandwidth <= MHZ_TO_KHZ(20)) 511 end_freq = center_freq; 512 else 513 end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10); 514 515 return end_freq; 516 } 517 518 static bool 519 cfg80211_dfs_permissive_check_wdev(struct cfg80211_registered_device *rdev, 520 enum nl80211_iftype iftype, 521 struct wireless_dev *wdev, 522 struct ieee80211_channel *chan) 523 { 524 unsigned int link_id; 525 526 for_each_valid_link(wdev, link_id) { 527 struct ieee80211_channel *other_chan = NULL; 528 struct cfg80211_chan_def chandef = {}; 529 int ret; 530 531 /* In order to avoid daisy chaining only allow BSS STA */ 532 if (wdev->iftype != NL80211_IFTYPE_STATION || 533 !wdev->links[link_id].client.current_bss) 534 continue; 535 536 other_chan = 537 wdev->links[link_id].client.current_bss->pub.channel; 538 539 if (!other_chan) 540 continue; 541 542 if (chan == other_chan) 543 return true; 544 545 /* continue if we can't get the channel */ 546 ret = rdev_get_channel(rdev, wdev, link_id, &chandef); 547 if (ret) 548 continue; 549 550 if (cfg80211_is_sub_chan(&chandef, chan, false)) 551 return true; 552 } 553 554 return false; 555 } 556 557 /* 558 * Check if P2P GO is allowed to operate on a DFS channel 559 */ 560 static bool cfg80211_dfs_permissive_chan(struct wiphy *wiphy, 561 enum nl80211_iftype iftype, 562 struct ieee80211_channel *chan) 563 { 564 struct wireless_dev *wdev; 565 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 566 567 lockdep_assert_held(&rdev->wiphy.mtx); 568 569 if (!wiphy_ext_feature_isset(&rdev->wiphy, 570 NL80211_EXT_FEATURE_DFS_CONCURRENT) || 571 !(chan->flags & IEEE80211_CHAN_DFS_CONCURRENT)) 572 return false; 573 574 /* only valid for P2P GO */ 575 if (iftype != NL80211_IFTYPE_P2P_GO) 576 return false; 577 578 /* 579 * Allow only if there's a concurrent BSS 580 */ 581 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 582 bool ret = cfg80211_dfs_permissive_check_wdev(rdev, iftype, 583 wdev, chan); 584 if (ret) 585 return ret; 586 } 587 588 return false; 589 } 590 591 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, 592 u32 center_freq, 593 u32 bandwidth, 594 enum nl80211_iftype iftype) 595 { 596 struct ieee80211_channel *c; 597 u32 freq, start_freq, end_freq; 598 599 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 600 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 601 602 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 603 c = ieee80211_get_channel_khz(wiphy, freq); 604 if (!c) 605 return -EINVAL; 606 607 if (c->flags & IEEE80211_CHAN_RADAR && 608 !cfg80211_dfs_permissive_chan(wiphy, iftype, c)) 609 return 1; 610 } 611 612 return 0; 613 } 614 615 616 int cfg80211_chandef_dfs_required(struct wiphy *wiphy, 617 const struct cfg80211_chan_def *chandef, 618 enum nl80211_iftype iftype) 619 { 620 int width; 621 int ret; 622 623 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 624 return -EINVAL; 625 626 switch (iftype) { 627 case NL80211_IFTYPE_ADHOC: 628 case NL80211_IFTYPE_AP: 629 case NL80211_IFTYPE_P2P_GO: 630 case NL80211_IFTYPE_MESH_POINT: 631 width = cfg80211_chandef_get_width(chandef); 632 if (width < 0) 633 return -EINVAL; 634 635 ret = cfg80211_get_chans_dfs_required(wiphy, 636 ieee80211_chandef_to_khz(chandef), 637 width, iftype); 638 if (ret < 0) 639 return ret; 640 else if (ret > 0) 641 return BIT(chandef->width); 642 643 if (!chandef->center_freq2) 644 return 0; 645 646 ret = cfg80211_get_chans_dfs_required(wiphy, 647 MHZ_TO_KHZ(chandef->center_freq2), 648 width, iftype); 649 if (ret < 0) 650 return ret; 651 else if (ret > 0) 652 return BIT(chandef->width); 653 654 break; 655 case NL80211_IFTYPE_STATION: 656 case NL80211_IFTYPE_OCB: 657 case NL80211_IFTYPE_P2P_CLIENT: 658 case NL80211_IFTYPE_MONITOR: 659 case NL80211_IFTYPE_AP_VLAN: 660 case NL80211_IFTYPE_P2P_DEVICE: 661 case NL80211_IFTYPE_NAN: 662 break; 663 case NL80211_IFTYPE_WDS: 664 case NL80211_IFTYPE_UNSPECIFIED: 665 case NUM_NL80211_IFTYPES: 666 WARN_ON(1); 667 } 668 669 return 0; 670 } 671 EXPORT_SYMBOL(cfg80211_chandef_dfs_required); 672 673 static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, 674 u32 center_freq, 675 u32 bandwidth) 676 { 677 struct ieee80211_channel *c; 678 u32 freq, start_freq, end_freq; 679 int count = 0; 680 681 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 682 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 683 684 /* 685 * Check entire range of channels for the bandwidth. 686 * Check all channels are DFS channels (DFS_USABLE or 687 * DFS_AVAILABLE). Return number of usable channels 688 * (require CAC). Allow DFS and non-DFS channel mix. 689 */ 690 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 691 c = ieee80211_get_channel_khz(wiphy, freq); 692 if (!c) 693 return -EINVAL; 694 695 if (c->flags & IEEE80211_CHAN_DISABLED) 696 return -EINVAL; 697 698 if (c->flags & IEEE80211_CHAN_RADAR) { 699 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) 700 return -EINVAL; 701 702 if (c->dfs_state == NL80211_DFS_USABLE) 703 count++; 704 } 705 } 706 707 return count; 708 } 709 710 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, 711 const struct cfg80211_chan_def *chandef) 712 { 713 int width; 714 int r1, r2 = 0; 715 716 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 717 return false; 718 719 width = cfg80211_chandef_get_width(chandef); 720 if (width < 0) 721 return false; 722 723 r1 = cfg80211_get_chans_dfs_usable(wiphy, 724 MHZ_TO_KHZ(chandef->center_freq1), 725 width); 726 727 if (r1 < 0) 728 return false; 729 730 switch (chandef->width) { 731 case NL80211_CHAN_WIDTH_80P80: 732 WARN_ON(!chandef->center_freq2); 733 r2 = cfg80211_get_chans_dfs_usable(wiphy, 734 MHZ_TO_KHZ(chandef->center_freq2), 735 width); 736 if (r2 < 0) 737 return false; 738 break; 739 default: 740 WARN_ON(chandef->center_freq2); 741 break; 742 } 743 744 return (r1 + r2 > 0); 745 } 746 EXPORT_SYMBOL(cfg80211_chandef_dfs_usable); 747 748 /* 749 * Checks if center frequency of chan falls with in the bandwidth 750 * range of chandef. 751 */ 752 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef, 753 struct ieee80211_channel *chan, 754 bool primary_only) 755 { 756 int width; 757 u32 freq; 758 759 if (!chandef->chan) 760 return false; 761 762 if (chandef->chan->center_freq == chan->center_freq) 763 return true; 764 765 if (primary_only) 766 return false; 767 768 width = cfg80211_chandef_get_width(chandef); 769 if (width <= 20) 770 return false; 771 772 for (freq = chandef->center_freq1 - width / 2 + 10; 773 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) { 774 if (chan->center_freq == freq) 775 return true; 776 } 777 778 if (!chandef->center_freq2) 779 return false; 780 781 for (freq = chandef->center_freq2 - width / 2 + 10; 782 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) { 783 if (chan->center_freq == freq) 784 return true; 785 } 786 787 return false; 788 } 789 790 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) 791 { 792 unsigned int link; 793 794 lockdep_assert_wiphy(wdev->wiphy); 795 796 switch (wdev->iftype) { 797 case NL80211_IFTYPE_AP: 798 case NL80211_IFTYPE_P2P_GO: 799 for_each_valid_link(wdev, link) { 800 if (wdev->links[link].ap.beacon_interval) 801 return true; 802 } 803 break; 804 case NL80211_IFTYPE_ADHOC: 805 if (wdev->u.ibss.ssid_len) 806 return true; 807 break; 808 case NL80211_IFTYPE_MESH_POINT: 809 if (wdev->u.mesh.id_len) 810 return true; 811 break; 812 case NL80211_IFTYPE_STATION: 813 case NL80211_IFTYPE_OCB: 814 case NL80211_IFTYPE_P2P_CLIENT: 815 case NL80211_IFTYPE_MONITOR: 816 case NL80211_IFTYPE_AP_VLAN: 817 case NL80211_IFTYPE_P2P_DEVICE: 818 /* Can NAN type be considered as beaconing interface? */ 819 case NL80211_IFTYPE_NAN: 820 break; 821 case NL80211_IFTYPE_UNSPECIFIED: 822 case NL80211_IFTYPE_WDS: 823 case NUM_NL80211_IFTYPES: 824 WARN_ON(1); 825 } 826 827 return false; 828 } 829 830 bool cfg80211_wdev_on_sub_chan(struct wireless_dev *wdev, 831 struct ieee80211_channel *chan, 832 bool primary_only) 833 { 834 unsigned int link; 835 836 switch (wdev->iftype) { 837 case NL80211_IFTYPE_AP: 838 case NL80211_IFTYPE_P2P_GO: 839 for_each_valid_link(wdev, link) { 840 if (cfg80211_is_sub_chan(&wdev->links[link].ap.chandef, 841 chan, primary_only)) 842 return true; 843 } 844 break; 845 case NL80211_IFTYPE_ADHOC: 846 return cfg80211_is_sub_chan(&wdev->u.ibss.chandef, chan, 847 primary_only); 848 case NL80211_IFTYPE_MESH_POINT: 849 return cfg80211_is_sub_chan(&wdev->u.mesh.chandef, chan, 850 primary_only); 851 default: 852 break; 853 } 854 855 return false; 856 } 857 858 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy, 859 struct ieee80211_channel *chan) 860 { 861 struct wireless_dev *wdev; 862 863 lockdep_assert_wiphy(wiphy); 864 865 list_for_each_entry(wdev, &wiphy->wdev_list, list) { 866 if (!cfg80211_beaconing_iface_active(wdev)) 867 continue; 868 869 if (cfg80211_wdev_on_sub_chan(wdev, chan, false)) 870 return true; 871 } 872 873 return false; 874 } 875 876 static bool 877 cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev, 878 struct ieee80211_channel *channel) 879 { 880 if (!rdev->background_radar_wdev) 881 return false; 882 883 if (!cfg80211_chandef_valid(&rdev->background_radar_chandef)) 884 return false; 885 886 return cfg80211_is_sub_chan(&rdev->background_radar_chandef, channel, 887 false); 888 } 889 890 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, 891 struct ieee80211_channel *chan) 892 { 893 struct cfg80211_registered_device *rdev; 894 895 ASSERT_RTNL(); 896 897 if (!(chan->flags & IEEE80211_CHAN_RADAR)) 898 return false; 899 900 for_each_rdev(rdev) { 901 bool found; 902 903 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy)) 904 continue; 905 906 wiphy_lock(&rdev->wiphy); 907 found = cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan) || 908 cfg80211_offchan_chain_is_active(rdev, chan); 909 wiphy_unlock(&rdev->wiphy); 910 911 if (found) 912 return true; 913 } 914 915 return false; 916 } 917 918 static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, 919 u32 center_freq, 920 u32 bandwidth) 921 { 922 struct ieee80211_channel *c; 923 u32 freq, start_freq, end_freq; 924 bool dfs_offload; 925 926 dfs_offload = wiphy_ext_feature_isset(wiphy, 927 NL80211_EXT_FEATURE_DFS_OFFLOAD); 928 929 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 930 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 931 932 /* 933 * Check entire range of channels for the bandwidth. 934 * If any channel in between is disabled or has not 935 * had gone through CAC return false 936 */ 937 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 938 c = ieee80211_get_channel_khz(wiphy, freq); 939 if (!c) 940 return false; 941 942 if (c->flags & IEEE80211_CHAN_DISABLED) 943 return false; 944 945 if ((c->flags & IEEE80211_CHAN_RADAR) && 946 (c->dfs_state != NL80211_DFS_AVAILABLE) && 947 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload)) 948 return false; 949 } 950 951 return true; 952 } 953 954 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 955 const struct cfg80211_chan_def *chandef) 956 { 957 int width; 958 int r; 959 960 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 961 return false; 962 963 width = cfg80211_chandef_get_width(chandef); 964 if (width < 0) 965 return false; 966 967 r = cfg80211_get_chans_dfs_available(wiphy, 968 MHZ_TO_KHZ(chandef->center_freq1), 969 width); 970 971 /* If any of channels unavailable for cf1 just return */ 972 if (!r) 973 return r; 974 975 switch (chandef->width) { 976 case NL80211_CHAN_WIDTH_80P80: 977 WARN_ON(!chandef->center_freq2); 978 r = cfg80211_get_chans_dfs_available(wiphy, 979 MHZ_TO_KHZ(chandef->center_freq2), 980 width); 981 break; 982 default: 983 WARN_ON(chandef->center_freq2); 984 break; 985 } 986 987 return r; 988 } 989 990 static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, 991 u32 center_freq, 992 u32 bandwidth) 993 { 994 struct ieee80211_channel *c; 995 u32 start_freq, end_freq, freq; 996 unsigned int dfs_cac_ms = 0; 997 998 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 999 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 1000 1001 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 1002 c = ieee80211_get_channel_khz(wiphy, freq); 1003 if (!c) 1004 return 0; 1005 1006 if (c->flags & IEEE80211_CHAN_DISABLED) 1007 return 0; 1008 1009 if (!(c->flags & IEEE80211_CHAN_RADAR)) 1010 continue; 1011 1012 if (c->dfs_cac_ms > dfs_cac_ms) 1013 dfs_cac_ms = c->dfs_cac_ms; 1014 } 1015 1016 return dfs_cac_ms; 1017 } 1018 1019 unsigned int 1020 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 1021 const struct cfg80211_chan_def *chandef) 1022 { 1023 int width; 1024 unsigned int t1 = 0, t2 = 0; 1025 1026 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 1027 return 0; 1028 1029 width = cfg80211_chandef_get_width(chandef); 1030 if (width < 0) 1031 return 0; 1032 1033 t1 = cfg80211_get_chans_dfs_cac_time(wiphy, 1034 MHZ_TO_KHZ(chandef->center_freq1), 1035 width); 1036 1037 if (!chandef->center_freq2) 1038 return t1; 1039 1040 t2 = cfg80211_get_chans_dfs_cac_time(wiphy, 1041 MHZ_TO_KHZ(chandef->center_freq2), 1042 width); 1043 1044 return max(t1, t2); 1045 } 1046 EXPORT_SYMBOL(cfg80211_chandef_dfs_cac_time); 1047 1048 static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, 1049 u32 center_freq, u32 bandwidth, 1050 u32 prohibited_flags) 1051 { 1052 struct ieee80211_channel *c; 1053 u32 freq, start_freq, end_freq; 1054 1055 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 1056 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 1057 1058 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 1059 c = ieee80211_get_channel_khz(wiphy, freq); 1060 if (!c || c->flags & prohibited_flags) 1061 return false; 1062 } 1063 1064 return true; 1065 } 1066 1067 /* check if the operating channels are valid and supported */ 1068 static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels, 1069 enum ieee80211_edmg_bw_config edmg_bw_config, 1070 int primary_channel, 1071 struct ieee80211_edmg *edmg_cap) 1072 { 1073 struct ieee80211_channel *chan; 1074 int i, freq; 1075 int channels_counter = 0; 1076 1077 if (!edmg_channels && !edmg_bw_config) 1078 return true; 1079 1080 if ((!edmg_channels && edmg_bw_config) || 1081 (edmg_channels && !edmg_bw_config)) 1082 return false; 1083 1084 if (!(edmg_channels & BIT(primary_channel - 1))) 1085 return false; 1086 1087 /* 60GHz channels 1..6 */ 1088 for (i = 0; i < 6; i++) { 1089 if (!(edmg_channels & BIT(i))) 1090 continue; 1091 1092 if (!(edmg_cap->channels & BIT(i))) 1093 return false; 1094 1095 channels_counter++; 1096 1097 freq = ieee80211_channel_to_frequency(i + 1, 1098 NL80211_BAND_60GHZ); 1099 chan = ieee80211_get_channel(wiphy, freq); 1100 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) 1101 return false; 1102 } 1103 1104 /* IEEE802.11 allows max 4 channels */ 1105 if (channels_counter > 4) 1106 return false; 1107 1108 /* check bw_config is a subset of what driver supports 1109 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13) 1110 */ 1111 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4)) 1112 return false; 1113 1114 if (edmg_bw_config > edmg_cap->bw_config) 1115 return false; 1116 1117 return true; 1118 } 1119 1120 bool cfg80211_chandef_usable(struct wiphy *wiphy, 1121 const struct cfg80211_chan_def *chandef, 1122 u32 prohibited_flags) 1123 { 1124 struct ieee80211_sta_ht_cap *ht_cap; 1125 struct ieee80211_sta_vht_cap *vht_cap; 1126 struct ieee80211_edmg *edmg_cap; 1127 u32 width, control_freq, cap; 1128 bool ext_nss_cap, support_80_80 = false, support_320 = false; 1129 const struct ieee80211_sband_iftype_data *iftd; 1130 struct ieee80211_supported_band *sband; 1131 int i; 1132 1133 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 1134 return false; 1135 1136 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 1137 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 1138 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap; 1139 ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) & 1140 IEEE80211_VHT_EXT_NSS_BW_CAPABLE; 1141 1142 if (edmg_cap->channels && 1143 !cfg80211_edmg_usable(wiphy, 1144 chandef->edmg.channels, 1145 chandef->edmg.bw_config, 1146 chandef->chan->hw_value, 1147 edmg_cap)) 1148 return false; 1149 1150 control_freq = chandef->chan->center_freq; 1151 1152 switch (chandef->width) { 1153 case NL80211_CHAN_WIDTH_1: 1154 width = 1; 1155 break; 1156 case NL80211_CHAN_WIDTH_2: 1157 width = 2; 1158 break; 1159 case NL80211_CHAN_WIDTH_4: 1160 width = 4; 1161 break; 1162 case NL80211_CHAN_WIDTH_8: 1163 width = 8; 1164 break; 1165 case NL80211_CHAN_WIDTH_16: 1166 width = 16; 1167 break; 1168 case NL80211_CHAN_WIDTH_5: 1169 width = 5; 1170 break; 1171 case NL80211_CHAN_WIDTH_10: 1172 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 1173 width = 10; 1174 break; 1175 case NL80211_CHAN_WIDTH_20: 1176 if (!ht_cap->ht_supported && 1177 chandef->chan->band != NL80211_BAND_6GHZ) 1178 return false; 1179 fallthrough; 1180 case NL80211_CHAN_WIDTH_20_NOHT: 1181 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 1182 width = 20; 1183 break; 1184 case NL80211_CHAN_WIDTH_40: 1185 width = 40; 1186 if (chandef->chan->band == NL80211_BAND_6GHZ) 1187 break; 1188 if (!ht_cap->ht_supported) 1189 return false; 1190 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 1191 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 1192 return false; 1193 if (chandef->center_freq1 < control_freq && 1194 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 1195 return false; 1196 if (chandef->center_freq1 > control_freq && 1197 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 1198 return false; 1199 break; 1200 case NL80211_CHAN_WIDTH_80P80: 1201 cap = vht_cap->cap; 1202 support_80_80 = 1203 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) || 1204 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 1205 cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) || 1206 (ext_nss_cap && 1207 u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1); 1208 if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80) 1209 return false; 1210 fallthrough; 1211 case NL80211_CHAN_WIDTH_80: 1212 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 1213 width = 80; 1214 if (chandef->chan->band == NL80211_BAND_6GHZ) 1215 break; 1216 if (!vht_cap->vht_supported) 1217 return false; 1218 break; 1219 case NL80211_CHAN_WIDTH_160: 1220 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 1221 width = 160; 1222 if (chandef->chan->band == NL80211_BAND_6GHZ) 1223 break; 1224 if (!vht_cap->vht_supported) 1225 return false; 1226 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 1227 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 1228 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ && 1229 !(ext_nss_cap && 1230 (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))) 1231 return false; 1232 break; 1233 case NL80211_CHAN_WIDTH_320: 1234 prohibited_flags |= IEEE80211_CHAN_NO_320MHZ; 1235 width = 320; 1236 1237 if (chandef->chan->band != NL80211_BAND_6GHZ) 1238 return false; 1239 1240 sband = wiphy->bands[NL80211_BAND_6GHZ]; 1241 if (!sband) 1242 return false; 1243 1244 for_each_sband_iftype_data(sband, i, iftd) { 1245 if (!iftd->eht_cap.has_eht) 1246 continue; 1247 1248 if (iftd->eht_cap.eht_cap_elem.phy_cap_info[0] & 1249 IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) { 1250 support_320 = true; 1251 break; 1252 } 1253 } 1254 1255 if (!support_320) 1256 return false; 1257 break; 1258 default: 1259 WARN_ON_ONCE(1); 1260 return false; 1261 } 1262 1263 /* 1264 * TODO: What if there are only certain 80/160/80+80 MHz channels 1265 * allowed by the driver, or only certain combinations? 1266 * For 40 MHz the driver can set the NO_HT40 flags, but for 1267 * 80/160 MHz and in particular 80+80 MHz this isn't really 1268 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 1269 * no way to cover 80+80 MHz or more complex restrictions. 1270 * Note that such restrictions also need to be advertised to 1271 * userspace, for example for P2P channel selection. 1272 */ 1273 1274 if (width > 20) 1275 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 1276 1277 /* 5 and 10 MHz are only defined for the OFDM PHY */ 1278 if (width < 20) 1279 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 1280 1281 1282 if (!cfg80211_secondary_chans_ok(wiphy, 1283 ieee80211_chandef_to_khz(chandef), 1284 width, prohibited_flags)) 1285 return false; 1286 1287 if (!chandef->center_freq2) 1288 return true; 1289 return cfg80211_secondary_chans_ok(wiphy, 1290 MHZ_TO_KHZ(chandef->center_freq2), 1291 width, prohibited_flags); 1292 } 1293 EXPORT_SYMBOL(cfg80211_chandef_usable); 1294 1295 static bool cfg80211_ir_permissive_check_wdev(enum nl80211_iftype iftype, 1296 struct wireless_dev *wdev, 1297 struct ieee80211_channel *chan) 1298 { 1299 struct ieee80211_channel *other_chan = NULL; 1300 unsigned int link_id; 1301 int r1, r2; 1302 1303 for_each_valid_link(wdev, link_id) { 1304 if (wdev->iftype == NL80211_IFTYPE_STATION && 1305 wdev->links[link_id].client.current_bss) 1306 other_chan = wdev->links[link_id].client.current_bss->pub.channel; 1307 1308 /* 1309 * If a GO already operates on the same GO_CONCURRENT channel, 1310 * this one (maybe the same one) can beacon as well. We allow 1311 * the operation even if the station we relied on with 1312 * GO_CONCURRENT is disconnected now. But then we must make sure 1313 * we're not outdoor on an indoor-only channel. 1314 */ 1315 if (iftype == NL80211_IFTYPE_P2P_GO && 1316 wdev->iftype == NL80211_IFTYPE_P2P_GO && 1317 wdev->links[link_id].ap.beacon_interval && 1318 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1319 other_chan = wdev->links[link_id].ap.chandef.chan; 1320 1321 if (!other_chan) 1322 continue; 1323 1324 if (chan == other_chan) 1325 return true; 1326 1327 if (chan->band != NL80211_BAND_5GHZ && 1328 chan->band != NL80211_BAND_6GHZ) 1329 continue; 1330 1331 r1 = cfg80211_get_unii(chan->center_freq); 1332 r2 = cfg80211_get_unii(other_chan->center_freq); 1333 1334 if (r1 != -EINVAL && r1 == r2) { 1335 /* 1336 * At some locations channels 149-165 are considered a 1337 * bundle, but at other locations, e.g., Indonesia, 1338 * channels 149-161 are considered a bundle while 1339 * channel 165 is left out and considered to be in a 1340 * different bundle. Thus, in case that there is a 1341 * station interface connected to an AP on channel 165, 1342 * it is assumed that channels 149-161 are allowed for 1343 * GO operations. However, having a station interface 1344 * connected to an AP on channels 149-161, does not 1345 * allow GO operation on channel 165. 1346 */ 1347 if (chan->center_freq == 5825 && 1348 other_chan->center_freq != 5825) 1349 continue; 1350 return true; 1351 } 1352 } 1353 1354 return false; 1355 } 1356 1357 /* 1358 * Check if the channel can be used under permissive conditions mandated by 1359 * some regulatory bodies, i.e., the channel is marked with 1360 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface 1361 * associated to an AP on the same channel or on the same UNII band 1362 * (assuming that the AP is an authorized master). 1363 * In addition allow operation on a channel on which indoor operation is 1364 * allowed, iff we are currently operating in an indoor environment. 1365 */ 1366 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 1367 enum nl80211_iftype iftype, 1368 struct ieee80211_channel *chan) 1369 { 1370 struct wireless_dev *wdev; 1371 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1372 1373 lockdep_assert_held(&rdev->wiphy.mtx); 1374 1375 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || 1376 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 1377 return false; 1378 1379 /* only valid for GO and TDLS off-channel (station/p2p-CL) */ 1380 if (iftype != NL80211_IFTYPE_P2P_GO && 1381 iftype != NL80211_IFTYPE_STATION && 1382 iftype != NL80211_IFTYPE_P2P_CLIENT) 1383 return false; 1384 1385 if (regulatory_indoor_allowed() && 1386 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1387 return true; 1388 1389 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) 1390 return false; 1391 1392 /* 1393 * Generally, it is possible to rely on another device/driver to allow 1394 * the IR concurrent relaxation, however, since the device can further 1395 * enforce the relaxation (by doing a similar verifications as this), 1396 * and thus fail the GO instantiation, consider only the interfaces of 1397 * the current registered device. 1398 */ 1399 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 1400 bool ret; 1401 1402 ret = cfg80211_ir_permissive_check_wdev(iftype, wdev, chan); 1403 if (ret) 1404 return ret; 1405 } 1406 1407 return false; 1408 } 1409 1410 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, 1411 struct cfg80211_chan_def *chandef, 1412 enum nl80211_iftype iftype, 1413 bool check_no_ir) 1414 { 1415 bool res; 1416 u32 prohibited_flags = IEEE80211_CHAN_DISABLED; 1417 int dfs_required; 1418 1419 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 1420 1421 if (check_no_ir) 1422 prohibited_flags |= IEEE80211_CHAN_NO_IR; 1423 1424 dfs_required = cfg80211_chandef_dfs_required(wiphy, chandef, iftype); 1425 if (dfs_required != 0) 1426 prohibited_flags |= IEEE80211_CHAN_RADAR; 1427 1428 if (dfs_required > 0 && 1429 cfg80211_chandef_dfs_available(wiphy, chandef)) { 1430 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 1431 prohibited_flags = IEEE80211_CHAN_DISABLED; 1432 } 1433 1434 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); 1435 1436 trace_cfg80211_return_bool(res); 1437 return res; 1438 } 1439 1440 bool cfg80211_reg_can_beacon(struct wiphy *wiphy, 1441 struct cfg80211_chan_def *chandef, 1442 enum nl80211_iftype iftype) 1443 { 1444 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); 1445 } 1446 EXPORT_SYMBOL(cfg80211_reg_can_beacon); 1447 1448 bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, 1449 struct cfg80211_chan_def *chandef, 1450 enum nl80211_iftype iftype) 1451 { 1452 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1453 bool check_no_ir; 1454 1455 lockdep_assert_held(&rdev->wiphy.mtx); 1456 1457 /* 1458 * Under certain conditions suggested by some regulatory bodies a 1459 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag 1460 * only if such relaxations are not enabled and the conditions are not 1461 * met. 1462 */ 1463 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, 1464 chandef->chan); 1465 1466 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 1467 } 1468 EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); 1469 1470 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 1471 struct cfg80211_chan_def *chandef) 1472 { 1473 if (!rdev->ops->set_monitor_channel) 1474 return -EOPNOTSUPP; 1475 if (!cfg80211_has_monitors_only(rdev)) 1476 return -EBUSY; 1477 1478 return rdev_set_monitor_channel(rdev, chandef); 1479 } 1480 1481 bool cfg80211_any_usable_channels(struct wiphy *wiphy, 1482 unsigned long sband_mask, 1483 u32 prohibited_flags) 1484 { 1485 int idx; 1486 1487 prohibited_flags |= IEEE80211_CHAN_DISABLED; 1488 1489 for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) { 1490 struct ieee80211_supported_band *sband = wiphy->bands[idx]; 1491 int chanidx; 1492 1493 if (!sband) 1494 continue; 1495 1496 for (chanidx = 0; chanidx < sband->n_channels; chanidx++) { 1497 struct ieee80211_channel *chan; 1498 1499 chan = &sband->channels[chanidx]; 1500 1501 if (chan->flags & prohibited_flags) 1502 continue; 1503 1504 return true; 1505 } 1506 } 1507 1508 return false; 1509 } 1510 EXPORT_SYMBOL(cfg80211_any_usable_channels); 1511 1512 struct cfg80211_chan_def *wdev_chandef(struct wireless_dev *wdev, 1513 unsigned int link_id) 1514 { 1515 lockdep_assert_wiphy(wdev->wiphy); 1516 1517 WARN_ON(wdev->valid_links && !(wdev->valid_links & BIT(link_id))); 1518 WARN_ON(!wdev->valid_links && link_id > 0); 1519 1520 switch (wdev->iftype) { 1521 case NL80211_IFTYPE_MESH_POINT: 1522 return &wdev->u.mesh.chandef; 1523 case NL80211_IFTYPE_ADHOC: 1524 return &wdev->u.ibss.chandef; 1525 case NL80211_IFTYPE_OCB: 1526 return &wdev->u.ocb.chandef; 1527 case NL80211_IFTYPE_AP: 1528 case NL80211_IFTYPE_P2P_GO: 1529 return &wdev->links[link_id].ap.chandef; 1530 default: 1531 return NULL; 1532 } 1533 } 1534 EXPORT_SYMBOL(wdev_chandef); 1535 1536 struct cfg80211_per_bw_puncturing_values { 1537 u8 len; 1538 const u16 *valid_values; 1539 }; 1540 1541 static const u16 puncturing_values_80mhz[] = { 1542 0x8, 0x4, 0x2, 0x1 1543 }; 1544 1545 static const u16 puncturing_values_160mhz[] = { 1546 0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1, 0xc0, 0x30, 0xc, 0x3 1547 }; 1548 1549 static const u16 puncturing_values_320mhz[] = { 1550 0xc000, 0x3000, 0xc00, 0x300, 0xc0, 0x30, 0xc, 0x3, 0xf000, 0xf00, 1551 0xf0, 0xf, 0xfc00, 0xf300, 0xf0c0, 0xf030, 0xf00c, 0xf003, 0xc00f, 1552 0x300f, 0xc0f, 0x30f, 0xcf, 0x3f 1553 }; 1554 1555 #define CFG80211_PER_BW_VALID_PUNCTURING_VALUES(_bw) \ 1556 { \ 1557 .len = ARRAY_SIZE(puncturing_values_ ## _bw ## mhz), \ 1558 .valid_values = puncturing_values_ ## _bw ## mhz \ 1559 } 1560 1561 static const struct cfg80211_per_bw_puncturing_values per_bw_puncturing[] = { 1562 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(80), 1563 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(160), 1564 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(320) 1565 }; 1566 1567 bool cfg80211_valid_disable_subchannel_bitmap(u16 *bitmap, 1568 const struct cfg80211_chan_def *chandef) 1569 { 1570 u32 idx, i, start_freq; 1571 1572 switch (chandef->width) { 1573 case NL80211_CHAN_WIDTH_80: 1574 idx = 0; 1575 start_freq = chandef->center_freq1 - 40; 1576 break; 1577 case NL80211_CHAN_WIDTH_160: 1578 idx = 1; 1579 start_freq = chandef->center_freq1 - 80; 1580 break; 1581 case NL80211_CHAN_WIDTH_320: 1582 idx = 2; 1583 start_freq = chandef->center_freq1 - 160; 1584 break; 1585 default: 1586 *bitmap = 0; 1587 break; 1588 } 1589 1590 if (!*bitmap) 1591 return true; 1592 1593 /* check if primary channel is punctured */ 1594 if (*bitmap & (u16)BIT((chandef->chan->center_freq - start_freq) / 20)) 1595 return false; 1596 1597 for (i = 0; i < per_bw_puncturing[idx].len; i++) 1598 if (per_bw_puncturing[idx].valid_values[i] == *bitmap) 1599 return true; 1600 1601 return false; 1602 } 1603 EXPORT_SYMBOL(cfg80211_valid_disable_subchannel_bitmap); 1604