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 2018-2024 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 18static bool cfg80211_valid_60g_freq(u32 freq) 19{ 20 return freq >= 58320 && freq <= 70200; 21} 22 23void 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 = (struct cfg80211_chan_def) { 31 .chan = chan, 32 .freq1_offset = chan->freq_offset, 33 }; 34 35 switch (chan_type) { 36 case NL80211_CHAN_NO_HT: 37 chandef->width = NL80211_CHAN_WIDTH_20_NOHT; 38 chandef->center_freq1 = chan->center_freq; 39 break; 40 case NL80211_CHAN_HT20: 41 chandef->width = NL80211_CHAN_WIDTH_20; 42 chandef->center_freq1 = chan->center_freq; 43 break; 44 case NL80211_CHAN_HT40PLUS: 45 chandef->width = NL80211_CHAN_WIDTH_40; 46 chandef->center_freq1 = chan->center_freq + 10; 47 break; 48 case NL80211_CHAN_HT40MINUS: 49 chandef->width = NL80211_CHAN_WIDTH_40; 50 chandef->center_freq1 = chan->center_freq - 10; 51 break; 52 default: 53 WARN_ON(1); 54 } 55} 56EXPORT_SYMBOL(cfg80211_chandef_create); 57 58struct cfg80211_per_bw_puncturing_values { 59 u8 len; 60 const u16 *valid_values; 61}; 62 63static const u16 puncturing_values_80mhz[] = { 64 0x8, 0x4, 0x2, 0x1 65}; 66 67static const u16 puncturing_values_160mhz[] = { 68 0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1, 0xc0, 0x30, 0xc, 0x3 69}; 70 71static const u16 puncturing_values_320mhz[] = { 72 0xc000, 0x3000, 0xc00, 0x300, 0xc0, 0x30, 0xc, 0x3, 0xf000, 0xf00, 73 0xf0, 0xf, 0xfc00, 0xf300, 0xf0c0, 0xf030, 0xf00c, 0xf003, 0xc00f, 74 0x300f, 0xc0f, 0x30f, 0xcf, 0x3f 75}; 76 77#define CFG80211_PER_BW_VALID_PUNCTURING_VALUES(_bw) \ 78 { \ 79 .len = ARRAY_SIZE(puncturing_values_ ## _bw ## mhz), \ 80 .valid_values = puncturing_values_ ## _bw ## mhz \ 81 } 82 83static const struct cfg80211_per_bw_puncturing_values per_bw_puncturing[] = { 84 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(80), 85 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(160), 86 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(320) 87}; 88 89static bool valid_puncturing_bitmap(const struct cfg80211_chan_def *chandef) 90{ 91 u32 idx, i, start_freq, primary_center = chandef->chan->center_freq; 92 93 switch (chandef->width) { 94 case NL80211_CHAN_WIDTH_80: 95 idx = 0; 96 start_freq = chandef->center_freq1 - 40; 97 break; 98 case NL80211_CHAN_WIDTH_160: 99 idx = 1; 100 start_freq = chandef->center_freq1 - 80; 101 break; 102 case NL80211_CHAN_WIDTH_320: 103 idx = 2; 104 start_freq = chandef->center_freq1 - 160; 105 break; 106 default: 107 return chandef->punctured == 0; 108 } 109 110 if (!chandef->punctured) 111 return true; 112 113 /* check if primary channel is punctured */ 114 if (chandef->punctured & (u16)BIT((primary_center - start_freq) / 20)) 115 return false; 116 117 for (i = 0; i < per_bw_puncturing[idx].len; i++) { 118 if (per_bw_puncturing[idx].valid_values[i] == chandef->punctured) 119 return true; 120 } 121 122 return false; 123} 124 125static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef) 126{ 127 int max_contiguous = 0; 128 int num_of_enabled = 0; 129 int contiguous = 0; 130 int i; 131 132 if (!chandef->edmg.channels || !chandef->edmg.bw_config) 133 return false; 134 135 if (!cfg80211_valid_60g_freq(chandef->chan->center_freq)) 136 return false; 137 138 for (i = 0; i < 6; i++) { 139 if (chandef->edmg.channels & BIT(i)) { 140 contiguous++; 141 num_of_enabled++; 142 } else { 143 contiguous = 0; 144 } 145 146 max_contiguous = max(contiguous, max_contiguous); 147 } 148 /* basic verification of edmg configuration according to 149 * IEEE P802.11ay/D4.0 section 9.4.2.251 150 */ 151 /* check bw_config against contiguous edmg channels */ 152 switch (chandef->edmg.bw_config) { 153 case IEEE80211_EDMG_BW_CONFIG_4: 154 case IEEE80211_EDMG_BW_CONFIG_8: 155 case IEEE80211_EDMG_BW_CONFIG_12: 156 if (max_contiguous < 1) 157 return false; 158 break; 159 case IEEE80211_EDMG_BW_CONFIG_5: 160 case IEEE80211_EDMG_BW_CONFIG_9: 161 case IEEE80211_EDMG_BW_CONFIG_13: 162 if (max_contiguous < 2) 163 return false; 164 break; 165 case IEEE80211_EDMG_BW_CONFIG_6: 166 case IEEE80211_EDMG_BW_CONFIG_10: 167 case IEEE80211_EDMG_BW_CONFIG_14: 168 if (max_contiguous < 3) 169 return false; 170 break; 171 case IEEE80211_EDMG_BW_CONFIG_7: 172 case IEEE80211_EDMG_BW_CONFIG_11: 173 case IEEE80211_EDMG_BW_CONFIG_15: 174 if (max_contiguous < 4) 175 return false; 176 break; 177 178 default: 179 return false; 180 } 181 182 /* check bw_config against aggregated (non contiguous) edmg channels */ 183 switch (chandef->edmg.bw_config) { 184 case IEEE80211_EDMG_BW_CONFIG_4: 185 case IEEE80211_EDMG_BW_CONFIG_5: 186 case IEEE80211_EDMG_BW_CONFIG_6: 187 case IEEE80211_EDMG_BW_CONFIG_7: 188 break; 189 case IEEE80211_EDMG_BW_CONFIG_8: 190 case IEEE80211_EDMG_BW_CONFIG_9: 191 case IEEE80211_EDMG_BW_CONFIG_10: 192 case IEEE80211_EDMG_BW_CONFIG_11: 193 if (num_of_enabled < 2) 194 return false; 195 break; 196 case IEEE80211_EDMG_BW_CONFIG_12: 197 case IEEE80211_EDMG_BW_CONFIG_13: 198 case IEEE80211_EDMG_BW_CONFIG_14: 199 case IEEE80211_EDMG_BW_CONFIG_15: 200 if (num_of_enabled < 4 || max_contiguous < 2) 201 return false; 202 break; 203 default: 204 return false; 205 } 206 207 return true; 208} 209 210int nl80211_chan_width_to_mhz(enum nl80211_chan_width chan_width) 211{ 212 int mhz; 213 214 switch (chan_width) { 215 case NL80211_CHAN_WIDTH_1: 216 mhz = 1; 217 break; 218 case NL80211_CHAN_WIDTH_2: 219 mhz = 2; 220 break; 221 case NL80211_CHAN_WIDTH_4: 222 mhz = 4; 223 break; 224 case NL80211_CHAN_WIDTH_8: 225 mhz = 8; 226 break; 227 case NL80211_CHAN_WIDTH_16: 228 mhz = 16; 229 break; 230 case NL80211_CHAN_WIDTH_5: 231 mhz = 5; 232 break; 233 case NL80211_CHAN_WIDTH_10: 234 mhz = 10; 235 break; 236 case NL80211_CHAN_WIDTH_20: 237 case NL80211_CHAN_WIDTH_20_NOHT: 238 mhz = 20; 239 break; 240 case NL80211_CHAN_WIDTH_40: 241 mhz = 40; 242 break; 243 case NL80211_CHAN_WIDTH_80P80: 244 case NL80211_CHAN_WIDTH_80: 245 mhz = 80; 246 break; 247 case NL80211_CHAN_WIDTH_160: 248 mhz = 160; 249 break; 250 case NL80211_CHAN_WIDTH_320: 251 mhz = 320; 252 break; 253 default: 254 WARN_ON_ONCE(1); 255 return -1; 256 } 257 return mhz; 258} 259EXPORT_SYMBOL(nl80211_chan_width_to_mhz); 260 261static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) 262{ 263 return nl80211_chan_width_to_mhz(c->width); 264} 265 266bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) 267{ 268 u32 control_freq, oper_freq; 269 int oper_width, control_width; 270 271 if (!chandef->chan) 272 return false; 273 274 if (chandef->freq1_offset >= 1000) 275 return false; 276 277 control_freq = chandef->chan->center_freq; 278 279 switch (chandef->width) { 280 case NL80211_CHAN_WIDTH_5: 281 case NL80211_CHAN_WIDTH_10: 282 case NL80211_CHAN_WIDTH_20: 283 case NL80211_CHAN_WIDTH_20_NOHT: 284 if (ieee80211_chandef_to_khz(chandef) != 285 ieee80211_channel_to_khz(chandef->chan)) 286 return false; 287 if (chandef->center_freq2) 288 return false; 289 break; 290 case NL80211_CHAN_WIDTH_1: 291 case NL80211_CHAN_WIDTH_2: 292 case NL80211_CHAN_WIDTH_4: 293 case NL80211_CHAN_WIDTH_8: 294 case NL80211_CHAN_WIDTH_16: 295 if (chandef->chan->band != NL80211_BAND_S1GHZ) 296 return false; 297 298 control_freq = ieee80211_channel_to_khz(chandef->chan); 299 oper_freq = ieee80211_chandef_to_khz(chandef); 300 control_width = nl80211_chan_width_to_mhz( 301 ieee80211_s1g_channel_width( 302 chandef->chan)); 303 oper_width = cfg80211_chandef_get_width(chandef); 304 305 if (oper_width < 0 || control_width < 0) 306 return false; 307 if (chandef->center_freq2) 308 return false; 309 310 if (control_freq + MHZ_TO_KHZ(control_width) / 2 > 311 oper_freq + MHZ_TO_KHZ(oper_width) / 2) 312 return false; 313 314 if (control_freq - MHZ_TO_KHZ(control_width) / 2 < 315 oper_freq - MHZ_TO_KHZ(oper_width) / 2) 316 return false; 317 break; 318 case NL80211_CHAN_WIDTH_80P80: 319 if (!chandef->center_freq2) 320 return false; 321 /* adjacent is not allowed -- that's a 160 MHz channel */ 322 if (chandef->center_freq1 - chandef->center_freq2 == 80 || 323 chandef->center_freq2 - chandef->center_freq1 == 80) 324 return false; 325 break; 326 default: 327 if (chandef->center_freq2) 328 return false; 329 break; 330 } 331 332 switch (chandef->width) { 333 case NL80211_CHAN_WIDTH_5: 334 case NL80211_CHAN_WIDTH_10: 335 case NL80211_CHAN_WIDTH_20: 336 case NL80211_CHAN_WIDTH_20_NOHT: 337 case NL80211_CHAN_WIDTH_1: 338 case NL80211_CHAN_WIDTH_2: 339 case NL80211_CHAN_WIDTH_4: 340 case NL80211_CHAN_WIDTH_8: 341 case NL80211_CHAN_WIDTH_16: 342 /* all checked above */ 343 break; 344 case NL80211_CHAN_WIDTH_320: 345 if (chandef->center_freq1 == control_freq + 150 || 346 chandef->center_freq1 == control_freq + 130 || 347 chandef->center_freq1 == control_freq + 110 || 348 chandef->center_freq1 == control_freq + 90 || 349 chandef->center_freq1 == control_freq - 90 || 350 chandef->center_freq1 == control_freq - 110 || 351 chandef->center_freq1 == control_freq - 130 || 352 chandef->center_freq1 == control_freq - 150) 353 break; 354 fallthrough; 355 case NL80211_CHAN_WIDTH_160: 356 if (chandef->center_freq1 == control_freq + 70 || 357 chandef->center_freq1 == control_freq + 50 || 358 chandef->center_freq1 == control_freq - 50 || 359 chandef->center_freq1 == control_freq - 70) 360 break; 361 fallthrough; 362 case NL80211_CHAN_WIDTH_80P80: 363 case NL80211_CHAN_WIDTH_80: 364 if (chandef->center_freq1 == control_freq + 30 || 365 chandef->center_freq1 == control_freq - 30) 366 break; 367 fallthrough; 368 case NL80211_CHAN_WIDTH_40: 369 if (chandef->center_freq1 == control_freq + 10 || 370 chandef->center_freq1 == control_freq - 10) 371 break; 372 fallthrough; 373 default: 374 return false; 375 } 376 377 /* channel 14 is only for IEEE 802.11b */ 378 if (chandef->center_freq1 == 2484 && 379 chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 380 return false; 381 382 if (cfg80211_chandef_is_edmg(chandef) && 383 !cfg80211_edmg_chandef_valid(chandef)) 384 return false; 385 386 return valid_puncturing_bitmap(chandef); 387} 388EXPORT_SYMBOL(cfg80211_chandef_valid); 389 390int cfg80211_chandef_primary(const struct cfg80211_chan_def *c, 391 enum nl80211_chan_width primary_chan_width, 392 u16 *punctured) 393{ 394 int pri_width = nl80211_chan_width_to_mhz(primary_chan_width); 395 int width = cfg80211_chandef_get_width(c); 396 u32 control = c->chan->center_freq; 397 u32 center = c->center_freq1; 398 u16 _punct = 0; 399 400 if (WARN_ON_ONCE(pri_width < 0 || width < 0)) 401 return -1; 402 403 /* not intended to be called this way, can't determine */ 404 if (WARN_ON_ONCE(pri_width > width)) 405 return -1; 406 407 if (!punctured) 408 punctured = &_punct; 409 410 *punctured = c->punctured; 411 412 while (width > pri_width) { 413 unsigned int bits_to_drop = width / 20 / 2; 414 415 if (control > center) { 416 center += width / 4; 417 *punctured >>= bits_to_drop; 418 } else { 419 center -= width / 4; 420 *punctured &= (1 << bits_to_drop) - 1; 421 } 422 width /= 2; 423 } 424 425 return center; 426} 427EXPORT_SYMBOL(cfg80211_chandef_primary); 428 429static const struct cfg80211_chan_def * 430check_chandef_primary_compat(const struct cfg80211_chan_def *c1, 431 const struct cfg80211_chan_def *c2, 432 enum nl80211_chan_width primary_chan_width) 433{ 434 u16 punct_c1 = 0, punct_c2 = 0; 435 436 /* check primary is compatible -> error if not */ 437 if (cfg80211_chandef_primary(c1, primary_chan_width, &punct_c1) != 438 cfg80211_chandef_primary(c2, primary_chan_width, &punct_c2)) 439 return ERR_PTR(-EINVAL); 440 441 if (punct_c1 != punct_c2) 442 return ERR_PTR(-EINVAL); 443 444 /* assumes c1 is smaller width, if that was just checked -> done */ 445 if (c1->width == primary_chan_width) 446 return c2; 447 448 /* otherwise continue checking the next width */ 449 return NULL; 450} 451 452static const struct cfg80211_chan_def * 453_cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, 454 const struct cfg80211_chan_def *c2) 455{ 456 const struct cfg80211_chan_def *ret; 457 458 /* If they are identical, return */ 459 if (cfg80211_chandef_identical(c1, c2)) 460 return c2; 461 462 /* otherwise, must have same control channel */ 463 if (c1->chan != c2->chan) 464 return NULL; 465 466 /* 467 * If they have the same width, but aren't identical, 468 * then they can't be compatible. 469 */ 470 if (c1->width == c2->width) 471 return NULL; 472 473 /* 474 * can't be compatible if one of them is 5/10 MHz or S1G 475 * but they don't have the same width. 476 */ 477#define NARROW_OR_S1G(width) ((width) == NL80211_CHAN_WIDTH_5 || \ 478 (width) == NL80211_CHAN_WIDTH_10 || \ 479 (width) == NL80211_CHAN_WIDTH_1 || \ 480 (width) == NL80211_CHAN_WIDTH_2 || \ 481 (width) == NL80211_CHAN_WIDTH_4 || \ 482 (width) == NL80211_CHAN_WIDTH_8 || \ 483 (width) == NL80211_CHAN_WIDTH_16) 484 485 if (NARROW_OR_S1G(c1->width) || NARROW_OR_S1G(c2->width)) 486 return NULL; 487 488 /* 489 * Make sure that c1 is always the narrower one, so that later 490 * we either return NULL or c2 and don't have to check both 491 * directions. 492 */ 493 if (c1->width > c2->width) 494 swap(c1, c2); 495 496 /* 497 * No further checks needed if the "narrower" one is only 20 MHz. 498 * Here "narrower" includes being a 20 MHz non-HT channel vs. a 499 * 20 MHz HT (or later) one. 500 */ 501 if (c1->width <= NL80211_CHAN_WIDTH_20) 502 return c2; 503 504 ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_40); 505 if (ret) 506 return ret; 507 508 ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_80); 509 if (ret) 510 return ret; 511 512 /* 513 * If c1 is 80+80, then c2 is 160 or higher, but that cannot 514 * match. If c2 was also 80+80 it was already either accepted 515 * or rejected above (identical or not, respectively.) 516 */ 517 if (c1->width == NL80211_CHAN_WIDTH_80P80) 518 return NULL; 519 520 ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_160); 521 if (ret) 522 return ret; 523 524 /* 525 * Getting here would mean they're both wider than 160, have the 526 * same primary 160, but are not identical - this cannot happen 527 * since they must be 320 (no wider chandefs exist, at least yet.) 528 */ 529 WARN_ON_ONCE(1); 530 531 return NULL; 532} 533 534const struct cfg80211_chan_def * 535cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, 536 const struct cfg80211_chan_def *c2) 537{ 538 const struct cfg80211_chan_def *ret; 539 540 ret = _cfg80211_chandef_compatible(c1, c2); 541 if (IS_ERR(ret)) 542 return NULL; 543 return ret; 544} 545EXPORT_SYMBOL(cfg80211_chandef_compatible); 546 547static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, 548 u32 bandwidth, 549 enum nl80211_dfs_state dfs_state) 550{ 551 struct ieee80211_channel *c; 552 u32 freq; 553 554 for (freq = center_freq - bandwidth/2 + 10; 555 freq <= center_freq + bandwidth/2 - 10; 556 freq += 20) { 557 c = ieee80211_get_channel(wiphy, freq); 558 if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) 559 continue; 560 561 c->dfs_state = dfs_state; 562 c->dfs_state_entered = jiffies; 563 } 564} 565 566void cfg80211_set_dfs_state(struct wiphy *wiphy, 567 const struct cfg80211_chan_def *chandef, 568 enum nl80211_dfs_state dfs_state) 569{ 570 int width; 571 572 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 573 return; 574 575 width = cfg80211_chandef_get_width(chandef); 576 if (width < 0) 577 return; 578 579 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1, 580 width, dfs_state); 581 582 if (!chandef->center_freq2) 583 return; 584 cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2, 585 width, dfs_state); 586} 587 588static u32 cfg80211_get_start_freq(u32 center_freq, 589 u32 bandwidth) 590{ 591 u32 start_freq; 592 593 bandwidth = MHZ_TO_KHZ(bandwidth); 594 if (bandwidth <= MHZ_TO_KHZ(20)) 595 start_freq = center_freq; 596 else 597 start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10); 598 599 return start_freq; 600} 601 602static u32 cfg80211_get_end_freq(u32 center_freq, 603 u32 bandwidth) 604{ 605 u32 end_freq; 606 607 bandwidth = MHZ_TO_KHZ(bandwidth); 608 if (bandwidth <= MHZ_TO_KHZ(20)) 609 end_freq = center_freq; 610 else 611 end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10); 612 613 return end_freq; 614} 615 616static bool 617cfg80211_dfs_permissive_check_wdev(struct cfg80211_registered_device *rdev, 618 enum nl80211_iftype iftype, 619 struct wireless_dev *wdev, 620 struct ieee80211_channel *chan) 621{ 622 unsigned int link_id; 623 624 for_each_valid_link(wdev, link_id) { 625 struct ieee80211_channel *other_chan = NULL; 626 struct cfg80211_chan_def chandef = {}; 627 int ret; 628 629 /* In order to avoid daisy chaining only allow BSS STA */ 630 if (wdev->iftype != NL80211_IFTYPE_STATION || 631 !wdev->links[link_id].client.current_bss) 632 continue; 633 634 other_chan = 635 wdev->links[link_id].client.current_bss->pub.channel; 636 637 if (!other_chan) 638 continue; 639 640 if (chan == other_chan) 641 return true; 642 643 /* continue if we can't get the channel */ 644 ret = rdev_get_channel(rdev, wdev, link_id, &chandef); 645 if (ret) 646 continue; 647 648 if (cfg80211_is_sub_chan(&chandef, chan, false)) 649 return true; 650 } 651 652 return false; 653} 654 655/* 656 * Check if P2P GO is allowed to operate on a DFS channel 657 */ 658static bool cfg80211_dfs_permissive_chan(struct wiphy *wiphy, 659 enum nl80211_iftype iftype, 660 struct ieee80211_channel *chan) 661{ 662 struct wireless_dev *wdev; 663 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 664 665 lockdep_assert_held(&rdev->wiphy.mtx); 666 667 if (!wiphy_ext_feature_isset(&rdev->wiphy, 668 NL80211_EXT_FEATURE_DFS_CONCURRENT) || 669 !(chan->flags & IEEE80211_CHAN_DFS_CONCURRENT)) 670 return false; 671 672 /* only valid for P2P GO */ 673 if (iftype != NL80211_IFTYPE_P2P_GO) 674 return false; 675 676 /* 677 * Allow only if there's a concurrent BSS 678 */ 679 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 680 bool ret = cfg80211_dfs_permissive_check_wdev(rdev, iftype, 681 wdev, chan); 682 if (ret) 683 return ret; 684 } 685 686 return false; 687} 688 689static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, 690 u32 center_freq, 691 u32 bandwidth, 692 enum nl80211_iftype iftype) 693{ 694 struct ieee80211_channel *c; 695 u32 freq, start_freq, end_freq; 696 697 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 698 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 699 700 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 701 c = ieee80211_get_channel_khz(wiphy, freq); 702 if (!c) 703 return -EINVAL; 704 705 if (c->flags & IEEE80211_CHAN_RADAR && 706 !cfg80211_dfs_permissive_chan(wiphy, iftype, c)) 707 return 1; 708 } 709 710 return 0; 711} 712 713 714int cfg80211_chandef_dfs_required(struct wiphy *wiphy, 715 const struct cfg80211_chan_def *chandef, 716 enum nl80211_iftype iftype) 717{ 718 int width; 719 int ret; 720 721 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 722 return -EINVAL; 723 724 switch (iftype) { 725 case NL80211_IFTYPE_ADHOC: 726 case NL80211_IFTYPE_AP: 727 case NL80211_IFTYPE_P2P_GO: 728 case NL80211_IFTYPE_MESH_POINT: 729 width = cfg80211_chandef_get_width(chandef); 730 if (width < 0) 731 return -EINVAL; 732 733 ret = cfg80211_get_chans_dfs_required(wiphy, 734 ieee80211_chandef_to_khz(chandef), 735 width, iftype); 736 if (ret < 0) 737 return ret; 738 else if (ret > 0) 739 return BIT(chandef->width); 740 741 if (!chandef->center_freq2) 742 return 0; 743 744 ret = cfg80211_get_chans_dfs_required(wiphy, 745 MHZ_TO_KHZ(chandef->center_freq2), 746 width, iftype); 747 if (ret < 0) 748 return ret; 749 else if (ret > 0) 750 return BIT(chandef->width); 751 752 break; 753 case NL80211_IFTYPE_STATION: 754 case NL80211_IFTYPE_OCB: 755 case NL80211_IFTYPE_P2P_CLIENT: 756 case NL80211_IFTYPE_MONITOR: 757 case NL80211_IFTYPE_AP_VLAN: 758 case NL80211_IFTYPE_P2P_DEVICE: 759 case NL80211_IFTYPE_NAN: 760 break; 761 case NL80211_IFTYPE_WDS: 762 case NL80211_IFTYPE_UNSPECIFIED: 763 case NUM_NL80211_IFTYPES: 764 WARN_ON(1); 765 } 766 767 return 0; 768} 769EXPORT_SYMBOL(cfg80211_chandef_dfs_required); 770 771static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, 772 u32 center_freq, 773 u32 bandwidth) 774{ 775 struct ieee80211_channel *c; 776 u32 freq, start_freq, end_freq; 777 int count = 0; 778 779 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 780 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 781 782 /* 783 * Check entire range of channels for the bandwidth. 784 * Check all channels are DFS channels (DFS_USABLE or 785 * DFS_AVAILABLE). Return number of usable channels 786 * (require CAC). Allow DFS and non-DFS channel mix. 787 */ 788 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 789 c = ieee80211_get_channel_khz(wiphy, freq); 790 if (!c) 791 return -EINVAL; 792 793 if (c->flags & IEEE80211_CHAN_DISABLED) 794 return -EINVAL; 795 796 if (c->flags & IEEE80211_CHAN_RADAR) { 797 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) 798 return -EINVAL; 799 800 if (c->dfs_state == NL80211_DFS_USABLE) 801 count++; 802 } 803 } 804 805 return count; 806} 807 808bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, 809 const struct cfg80211_chan_def *chandef) 810{ 811 int width; 812 int r1, r2 = 0; 813 814 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 815 return false; 816 817 width = cfg80211_chandef_get_width(chandef); 818 if (width < 0) 819 return false; 820 821 r1 = cfg80211_get_chans_dfs_usable(wiphy, 822 MHZ_TO_KHZ(chandef->center_freq1), 823 width); 824 825 if (r1 < 0) 826 return false; 827 828 switch (chandef->width) { 829 case NL80211_CHAN_WIDTH_80P80: 830 WARN_ON(!chandef->center_freq2); 831 r2 = cfg80211_get_chans_dfs_usable(wiphy, 832 MHZ_TO_KHZ(chandef->center_freq2), 833 width); 834 if (r2 < 0) 835 return false; 836 break; 837 default: 838 WARN_ON(chandef->center_freq2); 839 break; 840 } 841 842 return (r1 + r2 > 0); 843} 844EXPORT_SYMBOL(cfg80211_chandef_dfs_usable); 845 846/* 847 * Checks if center frequency of chan falls with in the bandwidth 848 * range of chandef. 849 */ 850bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef, 851 struct ieee80211_channel *chan, 852 bool primary_only) 853{ 854 int width; 855 u32 freq; 856 857 if (!chandef->chan) 858 return false; 859 860 if (chandef->chan->center_freq == chan->center_freq) 861 return true; 862 863 if (primary_only) 864 return false; 865 866 width = cfg80211_chandef_get_width(chandef); 867 if (width <= 20) 868 return false; 869 870 for (freq = chandef->center_freq1 - width / 2 + 10; 871 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) { 872 if (chan->center_freq == freq) 873 return true; 874 } 875 876 if (!chandef->center_freq2) 877 return false; 878 879 for (freq = chandef->center_freq2 - width / 2 + 10; 880 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) { 881 if (chan->center_freq == freq) 882 return true; 883 } 884 885 return false; 886} 887 888bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) 889{ 890 unsigned int link; 891 892 lockdep_assert_wiphy(wdev->wiphy); 893 894 switch (wdev->iftype) { 895 case NL80211_IFTYPE_AP: 896 case NL80211_IFTYPE_P2P_GO: 897 for_each_valid_link(wdev, link) { 898 if (wdev->links[link].ap.beacon_interval) 899 return true; 900 } 901 break; 902 case NL80211_IFTYPE_ADHOC: 903 if (wdev->u.ibss.ssid_len) 904 return true; 905 break; 906 case NL80211_IFTYPE_MESH_POINT: 907 if (wdev->u.mesh.id_len) 908 return true; 909 break; 910 case NL80211_IFTYPE_STATION: 911 case NL80211_IFTYPE_OCB: 912 case NL80211_IFTYPE_P2P_CLIENT: 913 case NL80211_IFTYPE_MONITOR: 914 case NL80211_IFTYPE_AP_VLAN: 915 case NL80211_IFTYPE_P2P_DEVICE: 916 /* Can NAN type be considered as beaconing interface? */ 917 case NL80211_IFTYPE_NAN: 918 break; 919 case NL80211_IFTYPE_UNSPECIFIED: 920 case NL80211_IFTYPE_WDS: 921 case NUM_NL80211_IFTYPES: 922 WARN_ON(1); 923 } 924 925 return false; 926} 927 928bool cfg80211_wdev_on_sub_chan(struct wireless_dev *wdev, 929 struct ieee80211_channel *chan, 930 bool primary_only) 931{ 932 unsigned int link; 933 934 switch (wdev->iftype) { 935 case NL80211_IFTYPE_AP: 936 case NL80211_IFTYPE_P2P_GO: 937 for_each_valid_link(wdev, link) { 938 if (cfg80211_is_sub_chan(&wdev->links[link].ap.chandef, 939 chan, primary_only)) 940 return true; 941 } 942 break; 943 case NL80211_IFTYPE_ADHOC: 944 return cfg80211_is_sub_chan(&wdev->u.ibss.chandef, chan, 945 primary_only); 946 case NL80211_IFTYPE_MESH_POINT: 947 return cfg80211_is_sub_chan(&wdev->u.mesh.chandef, chan, 948 primary_only); 949 default: 950 break; 951 } 952 953 return false; 954} 955 956static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy, 957 struct ieee80211_channel *chan) 958{ 959 struct wireless_dev *wdev; 960 961 lockdep_assert_wiphy(wiphy); 962 963 list_for_each_entry(wdev, &wiphy->wdev_list, list) { 964 if (!cfg80211_beaconing_iface_active(wdev)) 965 continue; 966 967 if (cfg80211_wdev_on_sub_chan(wdev, chan, false)) 968 return true; 969 } 970 971 return false; 972} 973 974static bool 975cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev, 976 struct ieee80211_channel *channel) 977{ 978 if (!rdev->background_radar_wdev) 979 return false; 980 981 if (!cfg80211_chandef_valid(&rdev->background_radar_chandef)) 982 return false; 983 984 return cfg80211_is_sub_chan(&rdev->background_radar_chandef, channel, 985 false); 986} 987 988bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, 989 struct ieee80211_channel *chan) 990{ 991 struct cfg80211_registered_device *rdev; 992 993 ASSERT_RTNL(); 994 995 if (!(chan->flags & IEEE80211_CHAN_RADAR)) 996 return false; 997 998 for_each_rdev(rdev) { 999 bool found; 1000 1001 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy)) 1002 continue; 1003 1004 wiphy_lock(&rdev->wiphy); 1005 found = cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan) || 1006 cfg80211_offchan_chain_is_active(rdev, chan); 1007 wiphy_unlock(&rdev->wiphy); 1008 1009 if (found) 1010 return true; 1011 } 1012 1013 return false; 1014} 1015 1016static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, 1017 u32 center_freq, 1018 u32 bandwidth) 1019{ 1020 struct ieee80211_channel *c; 1021 u32 freq, start_freq, end_freq; 1022 bool dfs_offload; 1023 1024 dfs_offload = wiphy_ext_feature_isset(wiphy, 1025 NL80211_EXT_FEATURE_DFS_OFFLOAD); 1026 1027 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 1028 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 1029 1030 /* 1031 * Check entire range of channels for the bandwidth. 1032 * If any channel in between is disabled or has not 1033 * had gone through CAC return false 1034 */ 1035 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 1036 c = ieee80211_get_channel_khz(wiphy, freq); 1037 if (!c) 1038 return false; 1039 1040 if (c->flags & IEEE80211_CHAN_DISABLED) 1041 return false; 1042 1043 if ((c->flags & IEEE80211_CHAN_RADAR) && 1044 (c->dfs_state != NL80211_DFS_AVAILABLE) && 1045 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload)) 1046 return false; 1047 } 1048 1049 return true; 1050} 1051 1052static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 1053 const struct cfg80211_chan_def *chandef) 1054{ 1055 int width; 1056 int r; 1057 1058 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 1059 return false; 1060 1061 width = cfg80211_chandef_get_width(chandef); 1062 if (width < 0) 1063 return false; 1064 1065 r = cfg80211_get_chans_dfs_available(wiphy, 1066 MHZ_TO_KHZ(chandef->center_freq1), 1067 width); 1068 1069 /* If any of channels unavailable for cf1 just return */ 1070 if (!r) 1071 return r; 1072 1073 switch (chandef->width) { 1074 case NL80211_CHAN_WIDTH_80P80: 1075 WARN_ON(!chandef->center_freq2); 1076 r = cfg80211_get_chans_dfs_available(wiphy, 1077 MHZ_TO_KHZ(chandef->center_freq2), 1078 width); 1079 break; 1080 default: 1081 WARN_ON(chandef->center_freq2); 1082 break; 1083 } 1084 1085 return r; 1086} 1087 1088static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, 1089 u32 center_freq, 1090 u32 bandwidth) 1091{ 1092 struct ieee80211_channel *c; 1093 u32 start_freq, end_freq, freq; 1094 unsigned int dfs_cac_ms = 0; 1095 1096 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 1097 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 1098 1099 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 1100 c = ieee80211_get_channel_khz(wiphy, freq); 1101 if (!c) 1102 return 0; 1103 1104 if (c->flags & IEEE80211_CHAN_DISABLED) 1105 return 0; 1106 1107 if (!(c->flags & IEEE80211_CHAN_RADAR)) 1108 continue; 1109 1110 if (c->dfs_cac_ms > dfs_cac_ms) 1111 dfs_cac_ms = c->dfs_cac_ms; 1112 } 1113 1114 return dfs_cac_ms; 1115} 1116 1117unsigned int 1118cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 1119 const struct cfg80211_chan_def *chandef) 1120{ 1121 int width; 1122 unsigned int t1 = 0, t2 = 0; 1123 1124 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 1125 return 0; 1126 1127 width = cfg80211_chandef_get_width(chandef); 1128 if (width < 0) 1129 return 0; 1130 1131 t1 = cfg80211_get_chans_dfs_cac_time(wiphy, 1132 MHZ_TO_KHZ(chandef->center_freq1), 1133 width); 1134 1135 if (!chandef->center_freq2) 1136 return t1; 1137 1138 t2 = cfg80211_get_chans_dfs_cac_time(wiphy, 1139 MHZ_TO_KHZ(chandef->center_freq2), 1140 width); 1141 1142 return max(t1, t2); 1143} 1144EXPORT_SYMBOL(cfg80211_chandef_dfs_cac_time); 1145 1146static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, 1147 u32 center_freq, u32 bandwidth, 1148 u32 prohibited_flags, bool monitor) 1149{ 1150 struct ieee80211_channel *c; 1151 u32 freq, start_freq, end_freq; 1152 1153 start_freq = cfg80211_get_start_freq(center_freq, bandwidth); 1154 end_freq = cfg80211_get_end_freq(center_freq, bandwidth); 1155 1156 for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { 1157 c = ieee80211_get_channel_khz(wiphy, freq); 1158 if (!c) 1159 return false; 1160 if (monitor && c->flags & IEEE80211_CHAN_CAN_MONITOR) 1161 continue; 1162 if (c->flags & prohibited_flags) 1163 return false; 1164 } 1165 1166 return true; 1167} 1168 1169/* check if the operating channels are valid and supported */ 1170static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels, 1171 enum ieee80211_edmg_bw_config edmg_bw_config, 1172 int primary_channel, 1173 struct ieee80211_edmg *edmg_cap) 1174{ 1175 struct ieee80211_channel *chan; 1176 int i, freq; 1177 int channels_counter = 0; 1178 1179 if (!edmg_channels && !edmg_bw_config) 1180 return true; 1181 1182 if ((!edmg_channels && edmg_bw_config) || 1183 (edmg_channels && !edmg_bw_config)) 1184 return false; 1185 1186 if (!(edmg_channels & BIT(primary_channel - 1))) 1187 return false; 1188 1189 /* 60GHz channels 1..6 */ 1190 for (i = 0; i < 6; i++) { 1191 if (!(edmg_channels & BIT(i))) 1192 continue; 1193 1194 if (!(edmg_cap->channels & BIT(i))) 1195 return false; 1196 1197 channels_counter++; 1198 1199 freq = ieee80211_channel_to_frequency(i + 1, 1200 NL80211_BAND_60GHZ); 1201 chan = ieee80211_get_channel(wiphy, freq); 1202 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) 1203 return false; 1204 } 1205 1206 /* IEEE802.11 allows max 4 channels */ 1207 if (channels_counter > 4) 1208 return false; 1209 1210 /* check bw_config is a subset of what driver supports 1211 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13) 1212 */ 1213 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4)) 1214 return false; 1215 1216 if (edmg_bw_config > edmg_cap->bw_config) 1217 return false; 1218 1219 return true; 1220} 1221 1222bool _cfg80211_chandef_usable(struct wiphy *wiphy, 1223 const struct cfg80211_chan_def *chandef, 1224 u32 prohibited_flags, bool monitor) 1225{ 1226 struct ieee80211_sta_ht_cap *ht_cap; 1227 struct ieee80211_sta_vht_cap *vht_cap; 1228 struct ieee80211_edmg *edmg_cap; 1229 u32 width, control_freq, cap; 1230 bool ext_nss_cap, support_80_80 = false, support_320 = false; 1231 const struct ieee80211_sband_iftype_data *iftd; 1232 struct ieee80211_supported_band *sband; 1233 int i; 1234 1235 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 1236 return false; 1237 1238 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 1239 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 1240 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap; 1241 ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) & 1242 IEEE80211_VHT_EXT_NSS_BW_CAPABLE; 1243 1244 if (edmg_cap->channels && 1245 !cfg80211_edmg_usable(wiphy, 1246 chandef->edmg.channels, 1247 chandef->edmg.bw_config, 1248 chandef->chan->hw_value, 1249 edmg_cap)) 1250 return false; 1251 1252 control_freq = chandef->chan->center_freq; 1253 1254 switch (chandef->width) { 1255 case NL80211_CHAN_WIDTH_1: 1256 width = 1; 1257 break; 1258 case NL80211_CHAN_WIDTH_2: 1259 width = 2; 1260 break; 1261 case NL80211_CHAN_WIDTH_4: 1262 width = 4; 1263 break; 1264 case NL80211_CHAN_WIDTH_8: 1265 width = 8; 1266 break; 1267 case NL80211_CHAN_WIDTH_16: 1268 width = 16; 1269 break; 1270 case NL80211_CHAN_WIDTH_5: 1271 width = 5; 1272 break; 1273 case NL80211_CHAN_WIDTH_10: 1274 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 1275 width = 10; 1276 break; 1277 case NL80211_CHAN_WIDTH_20: 1278 if (!ht_cap->ht_supported && 1279 chandef->chan->band != NL80211_BAND_6GHZ) 1280 return false; 1281 fallthrough; 1282 case NL80211_CHAN_WIDTH_20_NOHT: 1283 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 1284 width = 20; 1285 break; 1286 case NL80211_CHAN_WIDTH_40: 1287 width = 40; 1288 if (chandef->chan->band == NL80211_BAND_6GHZ) 1289 break; 1290 if (!ht_cap->ht_supported) 1291 return false; 1292 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 1293 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 1294 return false; 1295 if (chandef->center_freq1 < control_freq && 1296 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 1297 return false; 1298 if (chandef->center_freq1 > control_freq && 1299 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 1300 return false; 1301 break; 1302 case NL80211_CHAN_WIDTH_80P80: 1303 cap = vht_cap->cap; 1304 support_80_80 = 1305 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) || 1306 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 1307 cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) || 1308 (ext_nss_cap && 1309 u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1); 1310 if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80) 1311 return false; 1312 fallthrough; 1313 case NL80211_CHAN_WIDTH_80: 1314 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 1315 width = 80; 1316 if (chandef->chan->band == NL80211_BAND_6GHZ) 1317 break; 1318 if (!vht_cap->vht_supported) 1319 return false; 1320 break; 1321 case NL80211_CHAN_WIDTH_160: 1322 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 1323 width = 160; 1324 if (chandef->chan->band == NL80211_BAND_6GHZ) 1325 break; 1326 if (!vht_cap->vht_supported) 1327 return false; 1328 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 1329 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 1330 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ && 1331 !(ext_nss_cap && 1332 (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))) 1333 return false; 1334 break; 1335 case NL80211_CHAN_WIDTH_320: 1336 prohibited_flags |= IEEE80211_CHAN_NO_320MHZ; 1337 width = 320; 1338 1339 if (chandef->chan->band != NL80211_BAND_6GHZ) 1340 return false; 1341 1342 sband = wiphy->bands[NL80211_BAND_6GHZ]; 1343 if (!sband) 1344 return false; 1345 1346 for_each_sband_iftype_data(sband, i, iftd) { 1347 if (!iftd->eht_cap.has_eht) 1348 continue; 1349 1350 if (iftd->eht_cap.eht_cap_elem.phy_cap_info[0] & 1351 IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) { 1352 support_320 = true; 1353 break; 1354 } 1355 } 1356 1357 if (!support_320) 1358 return false; 1359 break; 1360 default: 1361 WARN_ON_ONCE(1); 1362 return false; 1363 } 1364 1365 /* 1366 * TODO: What if there are only certain 80/160/80+80 MHz channels 1367 * allowed by the driver, or only certain combinations? 1368 * For 40 MHz the driver can set the NO_HT40 flags, but for 1369 * 80/160 MHz and in particular 80+80 MHz this isn't really 1370 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 1371 * no way to cover 80+80 MHz or more complex restrictions. 1372 * Note that such restrictions also need to be advertised to 1373 * userspace, for example for P2P channel selection. 1374 */ 1375 1376 if (width > 20) 1377 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 1378 1379 /* 5 and 10 MHz are only defined for the OFDM PHY */ 1380 if (width < 20) 1381 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 1382 1383 1384 if (!cfg80211_secondary_chans_ok(wiphy, 1385 ieee80211_chandef_to_khz(chandef), 1386 width, prohibited_flags, monitor)) 1387 return false; 1388 1389 if (!chandef->center_freq2) 1390 return true; 1391 return cfg80211_secondary_chans_ok(wiphy, 1392 MHZ_TO_KHZ(chandef->center_freq2), 1393 width, prohibited_flags, monitor); 1394} 1395 1396bool cfg80211_chandef_usable(struct wiphy *wiphy, 1397 const struct cfg80211_chan_def *chandef, 1398 u32 prohibited_flags) 1399{ 1400 return _cfg80211_chandef_usable(wiphy, chandef, prohibited_flags, 1401 false); 1402} 1403EXPORT_SYMBOL(cfg80211_chandef_usable); 1404 1405static bool cfg80211_ir_permissive_check_wdev(enum nl80211_iftype iftype, 1406 struct wireless_dev *wdev, 1407 struct ieee80211_channel *chan) 1408{ 1409 struct ieee80211_channel *other_chan = NULL; 1410 unsigned int link_id; 1411 int r1, r2; 1412 1413 for_each_valid_link(wdev, link_id) { 1414 if (wdev->iftype == NL80211_IFTYPE_STATION && 1415 wdev->links[link_id].client.current_bss) 1416 other_chan = wdev->links[link_id].client.current_bss->pub.channel; 1417 1418 /* 1419 * If a GO already operates on the same GO_CONCURRENT channel, 1420 * this one (maybe the same one) can beacon as well. We allow 1421 * the operation even if the station we relied on with 1422 * GO_CONCURRENT is disconnected now. But then we must make sure 1423 * we're not outdoor on an indoor-only channel. 1424 */ 1425 if (iftype == NL80211_IFTYPE_P2P_GO && 1426 wdev->iftype == NL80211_IFTYPE_P2P_GO && 1427 wdev->links[link_id].ap.beacon_interval && 1428 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1429 other_chan = wdev->links[link_id].ap.chandef.chan; 1430 1431 if (!other_chan) 1432 continue; 1433 1434 if (chan == other_chan) 1435 return true; 1436 1437 if (chan->band != NL80211_BAND_5GHZ && 1438 chan->band != NL80211_BAND_6GHZ) 1439 continue; 1440 1441 r1 = cfg80211_get_unii(chan->center_freq); 1442 r2 = cfg80211_get_unii(other_chan->center_freq); 1443 1444 if (r1 != -EINVAL && r1 == r2) { 1445 /* 1446 * At some locations channels 149-165 are considered a 1447 * bundle, but at other locations, e.g., Indonesia, 1448 * channels 149-161 are considered a bundle while 1449 * channel 165 is left out and considered to be in a 1450 * different bundle. Thus, in case that there is a 1451 * station interface connected to an AP on channel 165, 1452 * it is assumed that channels 149-161 are allowed for 1453 * GO operations. However, having a station interface 1454 * connected to an AP on channels 149-161, does not 1455 * allow GO operation on channel 165. 1456 */ 1457 if (chan->center_freq == 5825 && 1458 other_chan->center_freq != 5825) 1459 continue; 1460 return true; 1461 } 1462 } 1463 1464 return false; 1465} 1466 1467/* 1468 * Check if the channel can be used under permissive conditions mandated by 1469 * some regulatory bodies, i.e., the channel is marked with 1470 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface 1471 * associated to an AP on the same channel or on the same UNII band 1472 * (assuming that the AP is an authorized master). 1473 * In addition allow operation on a channel on which indoor operation is 1474 * allowed, iff we are currently operating in an indoor environment. 1475 */ 1476static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 1477 enum nl80211_iftype iftype, 1478 struct ieee80211_channel *chan) 1479{ 1480 struct wireless_dev *wdev; 1481 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1482 1483 lockdep_assert_held(&rdev->wiphy.mtx); 1484 1485 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || 1486 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 1487 return false; 1488 1489 /* only valid for GO and TDLS off-channel (station/p2p-CL) */ 1490 if (iftype != NL80211_IFTYPE_P2P_GO && 1491 iftype != NL80211_IFTYPE_STATION && 1492 iftype != NL80211_IFTYPE_P2P_CLIENT) 1493 return false; 1494 1495 if (regulatory_indoor_allowed() && 1496 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1497 return true; 1498 1499 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) 1500 return false; 1501 1502 /* 1503 * Generally, it is possible to rely on another device/driver to allow 1504 * the IR concurrent relaxation, however, since the device can further 1505 * enforce the relaxation (by doing a similar verifications as this), 1506 * and thus fail the GO instantiation, consider only the interfaces of 1507 * the current registered device. 1508 */ 1509 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 1510 bool ret; 1511 1512 ret = cfg80211_ir_permissive_check_wdev(iftype, wdev, chan); 1513 if (ret) 1514 return ret; 1515 } 1516 1517 return false; 1518} 1519 1520static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, 1521 struct cfg80211_chan_def *chandef, 1522 enum nl80211_iftype iftype, 1523 bool check_no_ir) 1524{ 1525 bool res; 1526 u32 prohibited_flags = IEEE80211_CHAN_DISABLED; 1527 int dfs_required; 1528 1529 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 1530 1531 if (check_no_ir) 1532 prohibited_flags |= IEEE80211_CHAN_NO_IR; 1533 1534 dfs_required = cfg80211_chandef_dfs_required(wiphy, chandef, iftype); 1535 if (dfs_required != 0) 1536 prohibited_flags |= IEEE80211_CHAN_RADAR; 1537 1538 if (dfs_required > 0 && 1539 cfg80211_chandef_dfs_available(wiphy, chandef)) { 1540 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 1541 prohibited_flags = IEEE80211_CHAN_DISABLED; 1542 } 1543 1544 res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); 1545 1546 trace_cfg80211_return_bool(res); 1547 return res; 1548} 1549 1550bool cfg80211_reg_can_beacon(struct wiphy *wiphy, 1551 struct cfg80211_chan_def *chandef, 1552 enum nl80211_iftype iftype) 1553{ 1554 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); 1555} 1556EXPORT_SYMBOL(cfg80211_reg_can_beacon); 1557 1558bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, 1559 struct cfg80211_chan_def *chandef, 1560 enum nl80211_iftype iftype) 1561{ 1562 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1563 bool check_no_ir; 1564 1565 lockdep_assert_held(&rdev->wiphy.mtx); 1566 1567 /* 1568 * Under certain conditions suggested by some regulatory bodies a 1569 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag 1570 * only if such relaxations are not enabled and the conditions are not 1571 * met. 1572 */ 1573 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, 1574 chandef->chan); 1575 1576 return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); 1577} 1578EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); 1579 1580int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 1581 struct cfg80211_chan_def *chandef) 1582{ 1583 if (!rdev->ops->set_monitor_channel) 1584 return -EOPNOTSUPP; 1585 if (!cfg80211_has_monitors_only(rdev)) 1586 return -EBUSY; 1587 1588 return rdev_set_monitor_channel(rdev, chandef); 1589} 1590 1591bool cfg80211_any_usable_channels(struct wiphy *wiphy, 1592 unsigned long sband_mask, 1593 u32 prohibited_flags) 1594{ 1595 int idx; 1596 1597 prohibited_flags |= IEEE80211_CHAN_DISABLED; 1598 1599 for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) { 1600 struct ieee80211_supported_band *sband = wiphy->bands[idx]; 1601 int chanidx; 1602 1603 if (!sband) 1604 continue; 1605 1606 for (chanidx = 0; chanidx < sband->n_channels; chanidx++) { 1607 struct ieee80211_channel *chan; 1608 1609 chan = &sband->channels[chanidx]; 1610 1611 if (chan->flags & prohibited_flags) 1612 continue; 1613 1614 return true; 1615 } 1616 } 1617 1618 return false; 1619} 1620EXPORT_SYMBOL(cfg80211_any_usable_channels); 1621 1622struct cfg80211_chan_def *wdev_chandef(struct wireless_dev *wdev, 1623 unsigned int link_id) 1624{ 1625 lockdep_assert_wiphy(wdev->wiphy); 1626 1627 WARN_ON(wdev->valid_links && !(wdev->valid_links & BIT(link_id))); 1628 WARN_ON(!wdev->valid_links && link_id > 0); 1629 1630 switch (wdev->iftype) { 1631 case NL80211_IFTYPE_MESH_POINT: 1632 return &wdev->u.mesh.chandef; 1633 case NL80211_IFTYPE_ADHOC: 1634 return &wdev->u.ibss.chandef; 1635 case NL80211_IFTYPE_OCB: 1636 return &wdev->u.ocb.chandef; 1637 case NL80211_IFTYPE_AP: 1638 case NL80211_IFTYPE_P2P_GO: 1639 return &wdev->links[link_id].ap.chandef; 1640 default: 1641 return NULL; 1642 } 1643} 1644EXPORT_SYMBOL(wdev_chandef); 1645