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 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 = (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 } 56 EXPORT_SYMBOL(cfg80211_chandef_create); 57 58 static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) 59 { 60 return nl80211_chan_width_to_mhz(c->width); 61 } 62 63 static u32 cfg80211_get_start_freq(const struct cfg80211_chan_def *chandef, 64 u32 cf) 65 { 66 u32 start_freq, center_freq, bandwidth; 67 68 center_freq = MHZ_TO_KHZ((cf == 1) ? 69 chandef->center_freq1 : chandef->center_freq2); 70 bandwidth = MHZ_TO_KHZ(cfg80211_chandef_get_width(chandef)); 71 72 if (bandwidth <= MHZ_TO_KHZ(20)) 73 start_freq = center_freq; 74 else 75 start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10); 76 77 return start_freq; 78 } 79 80 static u32 cfg80211_get_end_freq(const struct cfg80211_chan_def *chandef, 81 u32 cf) 82 { 83 u32 end_freq, center_freq, bandwidth; 84 85 center_freq = MHZ_TO_KHZ((cf == 1) ? 86 chandef->center_freq1 : chandef->center_freq2); 87 bandwidth = MHZ_TO_KHZ(cfg80211_chandef_get_width(chandef)); 88 89 if (bandwidth <= MHZ_TO_KHZ(20)) 90 end_freq = center_freq; 91 else 92 end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10); 93 94 return end_freq; 95 } 96 97 #define for_each_subchan(chandef, freq, cf) \ 98 for (u32 punctured = chandef->punctured, \ 99 cf = 1, freq = cfg80211_get_start_freq(chandef, cf); \ 100 freq <= cfg80211_get_end_freq(chandef, cf); \ 101 freq += MHZ_TO_KHZ(20), \ 102 ((cf == 1 && chandef->center_freq2 != 0 && \ 103 freq > cfg80211_get_end_freq(chandef, cf)) ? \ 104 (cf++, freq = cfg80211_get_start_freq(chandef, cf), \ 105 punctured = 0) : (punctured >>= 1))) \ 106 if (!(punctured & 1)) 107 108 struct cfg80211_per_bw_puncturing_values { 109 u8 len; 110 const u16 *valid_values; 111 }; 112 113 static const u16 puncturing_values_80mhz[] = { 114 0x8, 0x4, 0x2, 0x1 115 }; 116 117 static const u16 puncturing_values_160mhz[] = { 118 0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1, 0xc0, 0x30, 0xc, 0x3 119 }; 120 121 static const u16 puncturing_values_320mhz[] = { 122 0xc000, 0x3000, 0xc00, 0x300, 0xc0, 0x30, 0xc, 0x3, 0xf000, 0xf00, 123 0xf0, 0xf, 0xfc00, 0xf300, 0xf0c0, 0xf030, 0xf00c, 0xf003, 0xc00f, 124 0x300f, 0xc0f, 0x30f, 0xcf, 0x3f 125 }; 126 127 #define CFG80211_PER_BW_VALID_PUNCTURING_VALUES(_bw) \ 128 { \ 129 .len = ARRAY_SIZE(puncturing_values_ ## _bw ## mhz), \ 130 .valid_values = puncturing_values_ ## _bw ## mhz \ 131 } 132 133 static const struct cfg80211_per_bw_puncturing_values per_bw_puncturing[] = { 134 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(80), 135 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(160), 136 CFG80211_PER_BW_VALID_PUNCTURING_VALUES(320) 137 }; 138 139 static bool valid_puncturing_bitmap(const struct cfg80211_chan_def *chandef) 140 { 141 u32 idx, i, start_freq, primary_center = chandef->chan->center_freq; 142 143 switch (chandef->width) { 144 case NL80211_CHAN_WIDTH_80: 145 idx = 0; 146 start_freq = chandef->center_freq1 - 40; 147 break; 148 case NL80211_CHAN_WIDTH_160: 149 idx = 1; 150 start_freq = chandef->center_freq1 - 80; 151 break; 152 case NL80211_CHAN_WIDTH_320: 153 idx = 2; 154 start_freq = chandef->center_freq1 - 160; 155 break; 156 default: 157 return chandef->punctured == 0; 158 } 159 160 if (!chandef->punctured) 161 return true; 162 163 /* check if primary channel is punctured */ 164 if (chandef->punctured & (u16)BIT((primary_center - start_freq) / 20)) 165 return false; 166 167 for (i = 0; i < per_bw_puncturing[idx].len; i++) { 168 if (per_bw_puncturing[idx].valid_values[i] == chandef->punctured) 169 return true; 170 } 171 172 return false; 173 } 174 175 static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef) 176 { 177 int max_contiguous = 0; 178 int num_of_enabled = 0; 179 int contiguous = 0; 180 int i; 181 182 if (!chandef->edmg.channels || !chandef->edmg.bw_config) 183 return false; 184 185 if (!cfg80211_valid_60g_freq(chandef->chan->center_freq)) 186 return false; 187 188 for (i = 0; i < 6; i++) { 189 if (chandef->edmg.channels & BIT(i)) { 190 contiguous++; 191 num_of_enabled++; 192 } else { 193 contiguous = 0; 194 } 195 196 max_contiguous = max(contiguous, max_contiguous); 197 } 198 /* basic verification of edmg configuration according to 199 * IEEE P802.11ay/D4.0 section 9.4.2.251 200 */ 201 /* check bw_config against contiguous edmg channels */ 202 switch (chandef->edmg.bw_config) { 203 case IEEE80211_EDMG_BW_CONFIG_4: 204 case IEEE80211_EDMG_BW_CONFIG_8: 205 case IEEE80211_EDMG_BW_CONFIG_12: 206 if (max_contiguous < 1) 207 return false; 208 break; 209 case IEEE80211_EDMG_BW_CONFIG_5: 210 case IEEE80211_EDMG_BW_CONFIG_9: 211 case IEEE80211_EDMG_BW_CONFIG_13: 212 if (max_contiguous < 2) 213 return false; 214 break; 215 case IEEE80211_EDMG_BW_CONFIG_6: 216 case IEEE80211_EDMG_BW_CONFIG_10: 217 case IEEE80211_EDMG_BW_CONFIG_14: 218 if (max_contiguous < 3) 219 return false; 220 break; 221 case IEEE80211_EDMG_BW_CONFIG_7: 222 case IEEE80211_EDMG_BW_CONFIG_11: 223 case IEEE80211_EDMG_BW_CONFIG_15: 224 if (max_contiguous < 4) 225 return false; 226 break; 227 228 default: 229 return false; 230 } 231 232 /* check bw_config against aggregated (non contiguous) edmg channels */ 233 switch (chandef->edmg.bw_config) { 234 case IEEE80211_EDMG_BW_CONFIG_4: 235 case IEEE80211_EDMG_BW_CONFIG_5: 236 case IEEE80211_EDMG_BW_CONFIG_6: 237 case IEEE80211_EDMG_BW_CONFIG_7: 238 break; 239 case IEEE80211_EDMG_BW_CONFIG_8: 240 case IEEE80211_EDMG_BW_CONFIG_9: 241 case IEEE80211_EDMG_BW_CONFIG_10: 242 case IEEE80211_EDMG_BW_CONFIG_11: 243 if (num_of_enabled < 2) 244 return false; 245 break; 246 case IEEE80211_EDMG_BW_CONFIG_12: 247 case IEEE80211_EDMG_BW_CONFIG_13: 248 case IEEE80211_EDMG_BW_CONFIG_14: 249 case IEEE80211_EDMG_BW_CONFIG_15: 250 if (num_of_enabled < 4 || max_contiguous < 2) 251 return false; 252 break; 253 default: 254 return false; 255 } 256 257 return true; 258 } 259 260 int nl80211_chan_width_to_mhz(enum nl80211_chan_width chan_width) 261 { 262 int mhz; 263 264 switch (chan_width) { 265 case NL80211_CHAN_WIDTH_1: 266 mhz = 1; 267 break; 268 case NL80211_CHAN_WIDTH_2: 269 mhz = 2; 270 break; 271 case NL80211_CHAN_WIDTH_4: 272 mhz = 4; 273 break; 274 case NL80211_CHAN_WIDTH_8: 275 mhz = 8; 276 break; 277 case NL80211_CHAN_WIDTH_16: 278 mhz = 16; 279 break; 280 case NL80211_CHAN_WIDTH_5: 281 mhz = 5; 282 break; 283 case NL80211_CHAN_WIDTH_10: 284 mhz = 10; 285 break; 286 case NL80211_CHAN_WIDTH_20: 287 case NL80211_CHAN_WIDTH_20_NOHT: 288 mhz = 20; 289 break; 290 case NL80211_CHAN_WIDTH_40: 291 mhz = 40; 292 break; 293 case NL80211_CHAN_WIDTH_80P80: 294 case NL80211_CHAN_WIDTH_80: 295 mhz = 80; 296 break; 297 case NL80211_CHAN_WIDTH_160: 298 mhz = 160; 299 break; 300 case NL80211_CHAN_WIDTH_320: 301 mhz = 320; 302 break; 303 default: 304 WARN_ON_ONCE(1); 305 return -1; 306 } 307 return mhz; 308 } 309 EXPORT_SYMBOL(nl80211_chan_width_to_mhz); 310 311 static bool cfg80211_valid_center_freq(u32 center, 312 enum nl80211_chan_width width) 313 { 314 int bw; 315 int step; 316 317 /* We only do strict verification on 6 GHz */ 318 if (center < 5955 || center > 7115) 319 return true; 320 321 bw = nl80211_chan_width_to_mhz(width); 322 if (bw < 0) 323 return false; 324 325 /* Validate that the channels bw is entirely within the 6 GHz band */ 326 if (center - bw / 2 < 5945 || center + bw / 2 > 7125) 327 return false; 328 329 /* With 320 MHz the permitted channels overlap */ 330 if (bw == 320) 331 step = 160; 332 else 333 step = bw; 334 335 /* 336 * Valid channels are packed from lowest frequency towards higher ones. 337 * So test that the lower frequency aligns with one of these steps. 338 */ 339 return (center - bw / 2 - 5945) % step == 0; 340 } 341 342 bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) 343 { 344 u32 control_freq, oper_freq; 345 int oper_width, control_width; 346 347 if (!chandef->chan) 348 return false; 349 350 if (chandef->freq1_offset >= 1000) 351 return false; 352 353 control_freq = chandef->chan->center_freq; 354 355 switch (chandef->width) { 356 case NL80211_CHAN_WIDTH_5: 357 case NL80211_CHAN_WIDTH_10: 358 case NL80211_CHAN_WIDTH_20: 359 case NL80211_CHAN_WIDTH_20_NOHT: 360 if (ieee80211_chandef_to_khz(chandef) != 361 ieee80211_channel_to_khz(chandef->chan)) 362 return false; 363 if (chandef->center_freq2) 364 return false; 365 break; 366 case NL80211_CHAN_WIDTH_1: 367 case NL80211_CHAN_WIDTH_2: 368 case NL80211_CHAN_WIDTH_4: 369 case NL80211_CHAN_WIDTH_8: 370 case NL80211_CHAN_WIDTH_16: 371 if (chandef->chan->band != NL80211_BAND_S1GHZ) 372 return false; 373 374 control_freq = ieee80211_channel_to_khz(chandef->chan); 375 oper_freq = ieee80211_chandef_to_khz(chandef); 376 control_width = nl80211_chan_width_to_mhz( 377 ieee80211_s1g_channel_width( 378 chandef->chan)); 379 oper_width = cfg80211_chandef_get_width(chandef); 380 381 if (oper_width < 0 || control_width < 0) 382 return false; 383 if (chandef->center_freq2) 384 return false; 385 386 if (control_freq + MHZ_TO_KHZ(control_width) / 2 > 387 oper_freq + MHZ_TO_KHZ(oper_width) / 2) 388 return false; 389 390 if (control_freq - MHZ_TO_KHZ(control_width) / 2 < 391 oper_freq - MHZ_TO_KHZ(oper_width) / 2) 392 return false; 393 break; 394 case NL80211_CHAN_WIDTH_80P80: 395 if (!chandef->center_freq2) 396 return false; 397 /* adjacent is not allowed -- that's a 160 MHz channel */ 398 if (chandef->center_freq1 - chandef->center_freq2 == 80 || 399 chandef->center_freq2 - chandef->center_freq1 == 80) 400 return false; 401 break; 402 default: 403 if (chandef->center_freq2) 404 return false; 405 break; 406 } 407 408 switch (chandef->width) { 409 case NL80211_CHAN_WIDTH_5: 410 case NL80211_CHAN_WIDTH_10: 411 case NL80211_CHAN_WIDTH_20: 412 case NL80211_CHAN_WIDTH_20_NOHT: 413 case NL80211_CHAN_WIDTH_1: 414 case NL80211_CHAN_WIDTH_2: 415 case NL80211_CHAN_WIDTH_4: 416 case NL80211_CHAN_WIDTH_8: 417 case NL80211_CHAN_WIDTH_16: 418 /* all checked above */ 419 break; 420 case NL80211_CHAN_WIDTH_320: 421 if (chandef->center_freq1 == control_freq + 150 || 422 chandef->center_freq1 == control_freq + 130 || 423 chandef->center_freq1 == control_freq + 110 || 424 chandef->center_freq1 == control_freq + 90 || 425 chandef->center_freq1 == control_freq - 90 || 426 chandef->center_freq1 == control_freq - 110 || 427 chandef->center_freq1 == control_freq - 130 || 428 chandef->center_freq1 == control_freq - 150) 429 break; 430 fallthrough; 431 case NL80211_CHAN_WIDTH_160: 432 if (chandef->center_freq1 == control_freq + 70 || 433 chandef->center_freq1 == control_freq + 50 || 434 chandef->center_freq1 == control_freq - 50 || 435 chandef->center_freq1 == control_freq - 70) 436 break; 437 fallthrough; 438 case NL80211_CHAN_WIDTH_80P80: 439 case NL80211_CHAN_WIDTH_80: 440 if (chandef->center_freq1 == control_freq + 30 || 441 chandef->center_freq1 == control_freq - 30) 442 break; 443 fallthrough; 444 case NL80211_CHAN_WIDTH_40: 445 if (chandef->center_freq1 == control_freq + 10 || 446 chandef->center_freq1 == control_freq - 10) 447 break; 448 fallthrough; 449 default: 450 return false; 451 } 452 453 if (!cfg80211_valid_center_freq(chandef->center_freq1, chandef->width)) 454 return false; 455 456 if (chandef->width == NL80211_CHAN_WIDTH_80P80 && 457 !cfg80211_valid_center_freq(chandef->center_freq2, chandef->width)) 458 return false; 459 460 /* channel 14 is only for IEEE 802.11b */ 461 if (chandef->center_freq1 == 2484 && 462 chandef->width != NL80211_CHAN_WIDTH_20_NOHT) 463 return false; 464 465 if (cfg80211_chandef_is_edmg(chandef) && 466 !cfg80211_edmg_chandef_valid(chandef)) 467 return false; 468 469 return valid_puncturing_bitmap(chandef); 470 } 471 EXPORT_SYMBOL(cfg80211_chandef_valid); 472 473 int cfg80211_chandef_primary(const struct cfg80211_chan_def *c, 474 enum nl80211_chan_width primary_chan_width, 475 u16 *punctured) 476 { 477 int pri_width = nl80211_chan_width_to_mhz(primary_chan_width); 478 int width = cfg80211_chandef_get_width(c); 479 u32 control = c->chan->center_freq; 480 u32 center = c->center_freq1; 481 u16 _punct = 0; 482 483 if (WARN_ON_ONCE(pri_width < 0 || width < 0)) 484 return -1; 485 486 /* not intended to be called this way, can't determine */ 487 if (WARN_ON_ONCE(pri_width > width)) 488 return -1; 489 490 if (!punctured) 491 punctured = &_punct; 492 493 *punctured = c->punctured; 494 495 while (width > pri_width) { 496 unsigned int bits_to_drop = width / 20 / 2; 497 498 if (control > center) { 499 center += width / 4; 500 *punctured >>= bits_to_drop; 501 } else { 502 center -= width / 4; 503 *punctured &= (1 << bits_to_drop) - 1; 504 } 505 width /= 2; 506 } 507 508 return center; 509 } 510 EXPORT_SYMBOL(cfg80211_chandef_primary); 511 512 static const struct cfg80211_chan_def * 513 check_chandef_primary_compat(const struct cfg80211_chan_def *c1, 514 const struct cfg80211_chan_def *c2, 515 enum nl80211_chan_width primary_chan_width) 516 { 517 u16 punct_c1 = 0, punct_c2 = 0; 518 519 /* check primary is compatible -> error if not */ 520 if (cfg80211_chandef_primary(c1, primary_chan_width, &punct_c1) != 521 cfg80211_chandef_primary(c2, primary_chan_width, &punct_c2)) 522 return ERR_PTR(-EINVAL); 523 524 if (punct_c1 != punct_c2) 525 return ERR_PTR(-EINVAL); 526 527 /* assumes c1 is smaller width, if that was just checked -> done */ 528 if (c1->width == primary_chan_width) 529 return c2; 530 531 /* otherwise continue checking the next width */ 532 return NULL; 533 } 534 535 static const struct cfg80211_chan_def * 536 _cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, 537 const struct cfg80211_chan_def *c2) 538 { 539 const struct cfg80211_chan_def *ret; 540 541 /* If they are identical, return */ 542 if (cfg80211_chandef_identical(c1, c2)) 543 return c2; 544 545 /* otherwise, must have same control channel */ 546 if (c1->chan != c2->chan) 547 return NULL; 548 549 /* 550 * If they have the same width, but aren't identical, 551 * then they can't be compatible. 552 */ 553 if (c1->width == c2->width) 554 return NULL; 555 556 /* 557 * can't be compatible if one of them is 5/10 MHz or S1G 558 * but they don't have the same width. 559 */ 560 #define NARROW_OR_S1G(width) ((width) == NL80211_CHAN_WIDTH_5 || \ 561 (width) == NL80211_CHAN_WIDTH_10 || \ 562 (width) == NL80211_CHAN_WIDTH_1 || \ 563 (width) == NL80211_CHAN_WIDTH_2 || \ 564 (width) == NL80211_CHAN_WIDTH_4 || \ 565 (width) == NL80211_CHAN_WIDTH_8 || \ 566 (width) == NL80211_CHAN_WIDTH_16) 567 568 if (NARROW_OR_S1G(c1->width) || NARROW_OR_S1G(c2->width)) 569 return NULL; 570 571 /* 572 * Make sure that c1 is always the narrower one, so that later 573 * we either return NULL or c2 and don't have to check both 574 * directions. 575 */ 576 if (c1->width > c2->width) 577 swap(c1, c2); 578 579 /* 580 * No further checks needed if the "narrower" one is only 20 MHz. 581 * Here "narrower" includes being a 20 MHz non-HT channel vs. a 582 * 20 MHz HT (or later) one. 583 */ 584 if (c1->width <= NL80211_CHAN_WIDTH_20) 585 return c2; 586 587 ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_40); 588 if (ret) 589 return ret; 590 591 ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_80); 592 if (ret) 593 return ret; 594 595 /* 596 * If c1 is 80+80, then c2 is 160 or higher, but that cannot 597 * match. If c2 was also 80+80 it was already either accepted 598 * or rejected above (identical or not, respectively.) 599 */ 600 if (c1->width == NL80211_CHAN_WIDTH_80P80) 601 return NULL; 602 603 ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_160); 604 if (ret) 605 return ret; 606 607 /* 608 * Getting here would mean they're both wider than 160, have the 609 * same primary 160, but are not identical - this cannot happen 610 * since they must be 320 (no wider chandefs exist, at least yet.) 611 */ 612 WARN_ON_ONCE(1); 613 614 return NULL; 615 } 616 617 const struct cfg80211_chan_def * 618 cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, 619 const struct cfg80211_chan_def *c2) 620 { 621 const struct cfg80211_chan_def *ret; 622 623 ret = _cfg80211_chandef_compatible(c1, c2); 624 if (IS_ERR(ret)) 625 return NULL; 626 return ret; 627 } 628 EXPORT_SYMBOL(cfg80211_chandef_compatible); 629 630 void cfg80211_set_dfs_state(struct wiphy *wiphy, 631 const struct cfg80211_chan_def *chandef, 632 enum nl80211_dfs_state dfs_state) 633 { 634 struct ieee80211_channel *c; 635 int width; 636 637 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 638 return; 639 640 width = cfg80211_chandef_get_width(chandef); 641 if (width < 0) 642 return; 643 644 for_each_subchan(chandef, freq, cf) { 645 c = ieee80211_get_channel_khz(wiphy, freq); 646 if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) 647 continue; 648 649 c->dfs_state = dfs_state; 650 c->dfs_state_entered = jiffies; 651 } 652 } 653 654 static bool 655 cfg80211_dfs_permissive_check_wdev(struct cfg80211_registered_device *rdev, 656 enum nl80211_iftype iftype, 657 struct wireless_dev *wdev, 658 struct ieee80211_channel *chan) 659 { 660 unsigned int link_id; 661 662 for_each_valid_link(wdev, link_id) { 663 struct ieee80211_channel *other_chan = NULL; 664 struct cfg80211_chan_def chandef = {}; 665 int ret; 666 667 /* In order to avoid daisy chaining only allow BSS STA */ 668 if (wdev->iftype != NL80211_IFTYPE_STATION || 669 !wdev->links[link_id].client.current_bss) 670 continue; 671 672 other_chan = 673 wdev->links[link_id].client.current_bss->pub.channel; 674 675 if (!other_chan) 676 continue; 677 678 if (chan == other_chan) 679 return true; 680 681 /* continue if we can't get the channel */ 682 ret = rdev_get_channel(rdev, wdev, link_id, &chandef); 683 if (ret) 684 continue; 685 686 if (cfg80211_is_sub_chan(&chandef, chan, false)) 687 return true; 688 } 689 690 return false; 691 } 692 693 /* 694 * Check if P2P GO is allowed to operate on a DFS channel 695 */ 696 static bool cfg80211_dfs_permissive_chan(struct wiphy *wiphy, 697 enum nl80211_iftype iftype, 698 struct ieee80211_channel *chan) 699 { 700 struct wireless_dev *wdev; 701 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 702 703 lockdep_assert_held(&rdev->wiphy.mtx); 704 705 if (!wiphy_ext_feature_isset(&rdev->wiphy, 706 NL80211_EXT_FEATURE_DFS_CONCURRENT) || 707 !(chan->flags & IEEE80211_CHAN_DFS_CONCURRENT)) 708 return false; 709 710 /* only valid for P2P GO */ 711 if (iftype != NL80211_IFTYPE_P2P_GO) 712 return false; 713 714 /* 715 * Allow only if there's a concurrent BSS 716 */ 717 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 718 bool ret = cfg80211_dfs_permissive_check_wdev(rdev, iftype, 719 wdev, chan); 720 if (ret) 721 return ret; 722 } 723 724 return false; 725 } 726 727 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, 728 const struct cfg80211_chan_def *chandef, 729 enum nl80211_iftype iftype) 730 { 731 struct ieee80211_channel *c; 732 733 for_each_subchan(chandef, freq, cf) { 734 c = ieee80211_get_channel_khz(wiphy, freq); 735 if (!c) 736 return -EINVAL; 737 738 if (c->flags & IEEE80211_CHAN_RADAR && 739 !cfg80211_dfs_permissive_chan(wiphy, iftype, c)) 740 return 1; 741 } 742 743 return 0; 744 } 745 746 747 int cfg80211_chandef_dfs_required(struct wiphy *wiphy, 748 const struct cfg80211_chan_def *chandef, 749 enum nl80211_iftype iftype) 750 { 751 int width; 752 int ret; 753 754 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 755 return -EINVAL; 756 757 switch (iftype) { 758 case NL80211_IFTYPE_ADHOC: 759 case NL80211_IFTYPE_AP: 760 case NL80211_IFTYPE_P2P_GO: 761 case NL80211_IFTYPE_MESH_POINT: 762 width = cfg80211_chandef_get_width(chandef); 763 if (width < 0) 764 return -EINVAL; 765 766 ret = cfg80211_get_chans_dfs_required(wiphy, chandef, iftype); 767 768 return (ret > 0) ? BIT(chandef->width) : ret; 769 break; 770 case NL80211_IFTYPE_STATION: 771 case NL80211_IFTYPE_OCB: 772 case NL80211_IFTYPE_P2P_CLIENT: 773 case NL80211_IFTYPE_MONITOR: 774 case NL80211_IFTYPE_AP_VLAN: 775 case NL80211_IFTYPE_P2P_DEVICE: 776 case NL80211_IFTYPE_NAN: 777 break; 778 case NL80211_IFTYPE_WDS: 779 case NL80211_IFTYPE_UNSPECIFIED: 780 case NUM_NL80211_IFTYPES: 781 WARN_ON(1); 782 } 783 784 return 0; 785 } 786 EXPORT_SYMBOL(cfg80211_chandef_dfs_required); 787 788 bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, 789 const struct cfg80211_chan_def *chandef) 790 { 791 struct ieee80211_channel *c; 792 int width, count = 0; 793 794 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 795 return false; 796 797 width = cfg80211_chandef_get_width(chandef); 798 if (width < 0) 799 return false; 800 801 /* 802 * Check entire range of channels for the bandwidth. 803 * Check all channels are DFS channels (DFS_USABLE or 804 * DFS_AVAILABLE). Return number of usable channels 805 * (require CAC). Allow DFS and non-DFS channel mix. 806 */ 807 for_each_subchan(chandef, freq, cf) { 808 c = ieee80211_get_channel_khz(wiphy, freq); 809 if (!c) 810 return false; 811 812 if (c->flags & IEEE80211_CHAN_DISABLED) 813 return false; 814 815 if (c->flags & IEEE80211_CHAN_RADAR) { 816 if (c->dfs_state == NL80211_DFS_UNAVAILABLE) 817 return false; 818 819 if (c->dfs_state == NL80211_DFS_USABLE) 820 count++; 821 } 822 } 823 824 return count > 0; 825 } 826 EXPORT_SYMBOL(cfg80211_chandef_dfs_usable); 827 828 /* 829 * Checks if center frequency of chan falls with in the bandwidth 830 * range of chandef. 831 */ 832 bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef, 833 struct ieee80211_channel *chan, 834 bool primary_only) 835 { 836 int width; 837 u32 freq; 838 839 if (!chandef->chan) 840 return false; 841 842 if (chandef->chan->center_freq == chan->center_freq) 843 return true; 844 845 if (primary_only) 846 return false; 847 848 width = cfg80211_chandef_get_width(chandef); 849 if (width <= 20) 850 return false; 851 852 for (freq = chandef->center_freq1 - width / 2 + 10; 853 freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) { 854 if (chan->center_freq == freq) 855 return true; 856 } 857 858 if (!chandef->center_freq2) 859 return false; 860 861 for (freq = chandef->center_freq2 - width / 2 + 10; 862 freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) { 863 if (chan->center_freq == freq) 864 return true; 865 } 866 867 return false; 868 } 869 870 bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) 871 { 872 unsigned int link; 873 874 lockdep_assert_wiphy(wdev->wiphy); 875 876 switch (wdev->iftype) { 877 case NL80211_IFTYPE_AP: 878 case NL80211_IFTYPE_P2P_GO: 879 for_each_valid_link(wdev, link) { 880 if (wdev->links[link].ap.beacon_interval) 881 return true; 882 } 883 break; 884 case NL80211_IFTYPE_ADHOC: 885 if (wdev->u.ibss.ssid_len) 886 return true; 887 break; 888 case NL80211_IFTYPE_MESH_POINT: 889 if (wdev->u.mesh.id_len) 890 return true; 891 break; 892 case NL80211_IFTYPE_STATION: 893 case NL80211_IFTYPE_OCB: 894 case NL80211_IFTYPE_P2P_CLIENT: 895 case NL80211_IFTYPE_MONITOR: 896 case NL80211_IFTYPE_AP_VLAN: 897 case NL80211_IFTYPE_P2P_DEVICE: 898 /* Can NAN type be considered as beaconing interface? */ 899 case NL80211_IFTYPE_NAN: 900 break; 901 case NL80211_IFTYPE_UNSPECIFIED: 902 case NL80211_IFTYPE_WDS: 903 case NUM_NL80211_IFTYPES: 904 WARN_ON(1); 905 } 906 907 return false; 908 } 909 910 bool cfg80211_wdev_on_sub_chan(struct wireless_dev *wdev, 911 struct ieee80211_channel *chan, 912 bool primary_only) 913 { 914 unsigned int link; 915 916 switch (wdev->iftype) { 917 case NL80211_IFTYPE_AP: 918 case NL80211_IFTYPE_P2P_GO: 919 for_each_valid_link(wdev, link) { 920 if (cfg80211_is_sub_chan(&wdev->links[link].ap.chandef, 921 chan, primary_only)) 922 return true; 923 } 924 break; 925 case NL80211_IFTYPE_ADHOC: 926 return cfg80211_is_sub_chan(&wdev->u.ibss.chandef, chan, 927 primary_only); 928 case NL80211_IFTYPE_MESH_POINT: 929 return cfg80211_is_sub_chan(&wdev->u.mesh.chandef, chan, 930 primary_only); 931 default: 932 break; 933 } 934 935 return false; 936 } 937 938 static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy, 939 struct ieee80211_channel *chan) 940 { 941 struct wireless_dev *wdev; 942 943 lockdep_assert_wiphy(wiphy); 944 945 list_for_each_entry(wdev, &wiphy->wdev_list, list) { 946 if (!cfg80211_beaconing_iface_active(wdev)) 947 continue; 948 949 if (cfg80211_wdev_on_sub_chan(wdev, chan, false)) 950 return true; 951 } 952 953 return false; 954 } 955 956 static bool 957 cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev, 958 struct ieee80211_channel *channel) 959 { 960 if (!rdev->background_radar_wdev) 961 return false; 962 963 if (!cfg80211_chandef_valid(&rdev->background_radar_chandef)) 964 return false; 965 966 return cfg80211_is_sub_chan(&rdev->background_radar_chandef, channel, 967 false); 968 } 969 970 bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, 971 struct ieee80211_channel *chan) 972 { 973 struct cfg80211_registered_device *rdev; 974 975 ASSERT_RTNL(); 976 977 if (!(chan->flags & IEEE80211_CHAN_RADAR)) 978 return false; 979 980 for_each_rdev(rdev) { 981 bool found; 982 983 if (!reg_dfs_domain_same(wiphy, &rdev->wiphy)) 984 continue; 985 986 guard(wiphy)(&rdev->wiphy); 987 988 found = cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan) || 989 cfg80211_offchan_chain_is_active(rdev, chan); 990 991 if (found) 992 return true; 993 } 994 995 return false; 996 } 997 998 static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, 999 const struct cfg80211_chan_def *chandef) 1000 { 1001 struct ieee80211_channel *c; 1002 int width; 1003 bool dfs_offload; 1004 1005 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 1006 return false; 1007 1008 width = cfg80211_chandef_get_width(chandef); 1009 if (width < 0) 1010 return false; 1011 1012 dfs_offload = wiphy_ext_feature_isset(wiphy, 1013 NL80211_EXT_FEATURE_DFS_OFFLOAD); 1014 1015 /* 1016 * Check entire range of channels for the bandwidth. 1017 * If any channel in between is disabled or has not 1018 * had gone through CAC return false 1019 */ 1020 for_each_subchan(chandef, freq, cf) { 1021 c = ieee80211_get_channel_khz(wiphy, freq); 1022 if (!c) 1023 return false; 1024 1025 if (c->flags & IEEE80211_CHAN_DISABLED) 1026 return false; 1027 1028 if ((c->flags & IEEE80211_CHAN_RADAR) && 1029 (c->dfs_state != NL80211_DFS_AVAILABLE) && 1030 !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload)) 1031 return false; 1032 } 1033 1034 return true; 1035 } 1036 1037 unsigned int 1038 cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, 1039 const struct cfg80211_chan_def *chandef) 1040 { 1041 struct ieee80211_channel *c; 1042 int width; 1043 unsigned int t1 = 0, t2 = 0; 1044 1045 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 1046 return 0; 1047 1048 width = cfg80211_chandef_get_width(chandef); 1049 if (width < 0) 1050 return 0; 1051 1052 for_each_subchan(chandef, freq, cf) { 1053 c = ieee80211_get_channel_khz(wiphy, freq); 1054 if (!c || (c->flags & IEEE80211_CHAN_DISABLED)) { 1055 if (cf == 1) 1056 t1 = INT_MAX; 1057 else 1058 t2 = INT_MAX; 1059 continue; 1060 } 1061 1062 if (!(c->flags & IEEE80211_CHAN_RADAR)) 1063 continue; 1064 1065 if (cf == 1 && c->dfs_cac_ms > t1) 1066 t1 = c->dfs_cac_ms; 1067 1068 if (cf == 2 && c->dfs_cac_ms > t2) 1069 t2 = c->dfs_cac_ms; 1070 } 1071 1072 if (t1 == INT_MAX && t2 == INT_MAX) 1073 return 0; 1074 1075 if (t1 == INT_MAX) 1076 return t2; 1077 1078 if (t2 == INT_MAX) 1079 return t1; 1080 1081 return max(t1, t2); 1082 } 1083 EXPORT_SYMBOL(cfg80211_chandef_dfs_cac_time); 1084 1085 /* check if the operating channels are valid and supported */ 1086 static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels, 1087 enum ieee80211_edmg_bw_config edmg_bw_config, 1088 int primary_channel, 1089 struct ieee80211_edmg *edmg_cap) 1090 { 1091 struct ieee80211_channel *chan; 1092 int i, freq; 1093 int channels_counter = 0; 1094 1095 if (!edmg_channels && !edmg_bw_config) 1096 return true; 1097 1098 if ((!edmg_channels && edmg_bw_config) || 1099 (edmg_channels && !edmg_bw_config)) 1100 return false; 1101 1102 if (!(edmg_channels & BIT(primary_channel - 1))) 1103 return false; 1104 1105 /* 60GHz channels 1..6 */ 1106 for (i = 0; i < 6; i++) { 1107 if (!(edmg_channels & BIT(i))) 1108 continue; 1109 1110 if (!(edmg_cap->channels & BIT(i))) 1111 return false; 1112 1113 channels_counter++; 1114 1115 freq = ieee80211_channel_to_frequency(i + 1, 1116 NL80211_BAND_60GHZ); 1117 chan = ieee80211_get_channel(wiphy, freq); 1118 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) 1119 return false; 1120 } 1121 1122 /* IEEE802.11 allows max 4 channels */ 1123 if (channels_counter > 4) 1124 return false; 1125 1126 /* check bw_config is a subset of what driver supports 1127 * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13) 1128 */ 1129 if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4)) 1130 return false; 1131 1132 if (edmg_bw_config > edmg_cap->bw_config) 1133 return false; 1134 1135 return true; 1136 } 1137 1138 bool _cfg80211_chandef_usable(struct wiphy *wiphy, 1139 const struct cfg80211_chan_def *chandef, 1140 u32 prohibited_flags, 1141 u32 permitting_flags) 1142 { 1143 struct ieee80211_sta_ht_cap *ht_cap; 1144 struct ieee80211_sta_vht_cap *vht_cap; 1145 struct ieee80211_edmg *edmg_cap; 1146 u32 width, control_freq, cap; 1147 bool ext_nss_cap, support_80_80 = false, support_320 = false; 1148 const struct ieee80211_sband_iftype_data *iftd; 1149 struct ieee80211_supported_band *sband; 1150 struct ieee80211_channel *c; 1151 int i; 1152 1153 if (WARN_ON(!cfg80211_chandef_valid(chandef))) 1154 return false; 1155 1156 ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; 1157 vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; 1158 edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap; 1159 ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) & 1160 IEEE80211_VHT_EXT_NSS_BW_CAPABLE; 1161 1162 if (edmg_cap->channels && 1163 !cfg80211_edmg_usable(wiphy, 1164 chandef->edmg.channels, 1165 chandef->edmg.bw_config, 1166 chandef->chan->hw_value, 1167 edmg_cap)) 1168 return false; 1169 1170 control_freq = chandef->chan->center_freq; 1171 1172 switch (chandef->width) { 1173 case NL80211_CHAN_WIDTH_1: 1174 width = 1; 1175 break; 1176 case NL80211_CHAN_WIDTH_2: 1177 width = 2; 1178 break; 1179 case NL80211_CHAN_WIDTH_4: 1180 width = 4; 1181 break; 1182 case NL80211_CHAN_WIDTH_8: 1183 width = 8; 1184 break; 1185 case NL80211_CHAN_WIDTH_16: 1186 width = 16; 1187 break; 1188 case NL80211_CHAN_WIDTH_5: 1189 width = 5; 1190 break; 1191 case NL80211_CHAN_WIDTH_10: 1192 prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; 1193 width = 10; 1194 break; 1195 case NL80211_CHAN_WIDTH_20: 1196 if (!ht_cap->ht_supported && 1197 chandef->chan->band != NL80211_BAND_6GHZ) 1198 return false; 1199 fallthrough; 1200 case NL80211_CHAN_WIDTH_20_NOHT: 1201 prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; 1202 width = 20; 1203 break; 1204 case NL80211_CHAN_WIDTH_40: 1205 width = 40; 1206 if (chandef->chan->band == NL80211_BAND_6GHZ) 1207 break; 1208 if (!ht_cap->ht_supported) 1209 return false; 1210 if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || 1211 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) 1212 return false; 1213 if (chandef->center_freq1 < control_freq && 1214 chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) 1215 return false; 1216 if (chandef->center_freq1 > control_freq && 1217 chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) 1218 return false; 1219 break; 1220 case NL80211_CHAN_WIDTH_80P80: 1221 cap = vht_cap->cap; 1222 support_80_80 = 1223 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) || 1224 (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 1225 cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) || 1226 (ext_nss_cap && 1227 u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1); 1228 if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80) 1229 return false; 1230 fallthrough; 1231 case NL80211_CHAN_WIDTH_80: 1232 prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; 1233 width = 80; 1234 if (chandef->chan->band == NL80211_BAND_6GHZ) 1235 break; 1236 if (!vht_cap->vht_supported) 1237 return false; 1238 break; 1239 case NL80211_CHAN_WIDTH_160: 1240 prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; 1241 width = 160; 1242 if (chandef->chan->band == NL80211_BAND_6GHZ) 1243 break; 1244 if (!vht_cap->vht_supported) 1245 return false; 1246 cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; 1247 if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && 1248 cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ && 1249 !(ext_nss_cap && 1250 (vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))) 1251 return false; 1252 break; 1253 case NL80211_CHAN_WIDTH_320: 1254 prohibited_flags |= IEEE80211_CHAN_NO_320MHZ; 1255 width = 320; 1256 1257 if (chandef->chan->band != NL80211_BAND_6GHZ) 1258 return false; 1259 1260 sband = wiphy->bands[NL80211_BAND_6GHZ]; 1261 if (!sband) 1262 return false; 1263 1264 for_each_sband_iftype_data(sband, i, iftd) { 1265 if (!iftd->eht_cap.has_eht) 1266 continue; 1267 1268 if (iftd->eht_cap.eht_cap_elem.phy_cap_info[0] & 1269 IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) { 1270 support_320 = true; 1271 break; 1272 } 1273 } 1274 1275 if (!support_320) 1276 return false; 1277 break; 1278 default: 1279 WARN_ON_ONCE(1); 1280 return false; 1281 } 1282 1283 /* 1284 * TODO: What if there are only certain 80/160/80+80 MHz channels 1285 * allowed by the driver, or only certain combinations? 1286 * For 40 MHz the driver can set the NO_HT40 flags, but for 1287 * 80/160 MHz and in particular 80+80 MHz this isn't really 1288 * feasible and we only have NO_80MHZ/NO_160MHZ so far but 1289 * no way to cover 80+80 MHz or more complex restrictions. 1290 * Note that such restrictions also need to be advertised to 1291 * userspace, for example for P2P channel selection. 1292 */ 1293 1294 if (width > 20) 1295 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 1296 1297 /* 5 and 10 MHz are only defined for the OFDM PHY */ 1298 if (width < 20) 1299 prohibited_flags |= IEEE80211_CHAN_NO_OFDM; 1300 1301 for_each_subchan(chandef, freq, cf) { 1302 c = ieee80211_get_channel_khz(wiphy, freq); 1303 if (!c) 1304 return false; 1305 if (c->flags & permitting_flags) 1306 continue; 1307 if (c->flags & prohibited_flags) 1308 return false; 1309 } 1310 1311 return true; 1312 } 1313 1314 bool cfg80211_chandef_usable(struct wiphy *wiphy, 1315 const struct cfg80211_chan_def *chandef, 1316 u32 prohibited_flags) 1317 { 1318 return _cfg80211_chandef_usable(wiphy, chandef, prohibited_flags, 0); 1319 } 1320 EXPORT_SYMBOL(cfg80211_chandef_usable); 1321 1322 static bool cfg80211_ir_permissive_check_wdev(enum nl80211_iftype iftype, 1323 struct wireless_dev *wdev, 1324 struct ieee80211_channel *chan) 1325 { 1326 struct ieee80211_channel *other_chan = NULL; 1327 unsigned int link_id; 1328 int r1, r2; 1329 1330 for_each_valid_link(wdev, link_id) { 1331 if (wdev->iftype == NL80211_IFTYPE_STATION && 1332 wdev->links[link_id].client.current_bss) 1333 other_chan = wdev->links[link_id].client.current_bss->pub.channel; 1334 1335 /* 1336 * If a GO already operates on the same GO_CONCURRENT channel, 1337 * this one (maybe the same one) can beacon as well. We allow 1338 * the operation even if the station we relied on with 1339 * GO_CONCURRENT is disconnected now. But then we must make sure 1340 * we're not outdoor on an indoor-only channel. 1341 */ 1342 if (iftype == NL80211_IFTYPE_P2P_GO && 1343 wdev->iftype == NL80211_IFTYPE_P2P_GO && 1344 wdev->links[link_id].ap.beacon_interval && 1345 !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1346 other_chan = wdev->links[link_id].ap.chandef.chan; 1347 1348 if (!other_chan) 1349 continue; 1350 1351 if (chan == other_chan) 1352 return true; 1353 1354 if (chan->band != NL80211_BAND_5GHZ && 1355 chan->band != NL80211_BAND_6GHZ) 1356 continue; 1357 1358 r1 = cfg80211_get_unii(chan->center_freq); 1359 r2 = cfg80211_get_unii(other_chan->center_freq); 1360 1361 if (r1 != -EINVAL && r1 == r2) { 1362 /* 1363 * At some locations channels 149-165 are considered a 1364 * bundle, but at other locations, e.g., Indonesia, 1365 * channels 149-161 are considered a bundle while 1366 * channel 165 is left out and considered to be in a 1367 * different bundle. Thus, in case that there is a 1368 * station interface connected to an AP on channel 165, 1369 * it is assumed that channels 149-161 are allowed for 1370 * GO operations. However, having a station interface 1371 * connected to an AP on channels 149-161, does not 1372 * allow GO operation on channel 165. 1373 */ 1374 if (chan->center_freq == 5825 && 1375 other_chan->center_freq != 5825) 1376 continue; 1377 return true; 1378 } 1379 } 1380 1381 return false; 1382 } 1383 1384 /* 1385 * Check if the channel can be used under permissive conditions mandated by 1386 * some regulatory bodies, i.e., the channel is marked with 1387 * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface 1388 * associated to an AP on the same channel or on the same UNII band 1389 * (assuming that the AP is an authorized master). 1390 * In addition allow operation on a channel on which indoor operation is 1391 * allowed, iff we are currently operating in an indoor environment. 1392 */ 1393 static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, 1394 enum nl80211_iftype iftype, 1395 struct ieee80211_channel *chan) 1396 { 1397 struct wireless_dev *wdev; 1398 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1399 1400 lockdep_assert_held(&rdev->wiphy.mtx); 1401 1402 if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || 1403 !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) 1404 return false; 1405 1406 /* only valid for GO and TDLS off-channel (station/p2p-CL) */ 1407 if (iftype != NL80211_IFTYPE_P2P_GO && 1408 iftype != NL80211_IFTYPE_STATION && 1409 iftype != NL80211_IFTYPE_P2P_CLIENT) 1410 return false; 1411 1412 if (regulatory_indoor_allowed() && 1413 (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) 1414 return true; 1415 1416 if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) 1417 return false; 1418 1419 /* 1420 * Generally, it is possible to rely on another device/driver to allow 1421 * the IR concurrent relaxation, however, since the device can further 1422 * enforce the relaxation (by doing a similar verifications as this), 1423 * and thus fail the GO instantiation, consider only the interfaces of 1424 * the current registered device. 1425 */ 1426 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { 1427 bool ret; 1428 1429 ret = cfg80211_ir_permissive_check_wdev(iftype, wdev, chan); 1430 if (ret) 1431 return ret; 1432 } 1433 1434 return false; 1435 } 1436 1437 static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, 1438 struct cfg80211_chan_def *chandef, 1439 enum nl80211_iftype iftype, 1440 u32 prohibited_flags, 1441 u32 permitting_flags) 1442 { 1443 bool res, check_radar; 1444 int dfs_required; 1445 1446 trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, 1447 prohibited_flags, 1448 permitting_flags); 1449 1450 if (!_cfg80211_chandef_usable(wiphy, chandef, 1451 IEEE80211_CHAN_DISABLED, 0)) 1452 return false; 1453 1454 dfs_required = cfg80211_chandef_dfs_required(wiphy, chandef, iftype); 1455 check_radar = dfs_required != 0; 1456 1457 if (dfs_required > 0 && 1458 cfg80211_chandef_dfs_available(wiphy, chandef)) { 1459 /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ 1460 prohibited_flags &= ~IEEE80211_CHAN_NO_IR; 1461 check_radar = false; 1462 } 1463 1464 if (check_radar && 1465 !_cfg80211_chandef_usable(wiphy, chandef, 1466 IEEE80211_CHAN_RADAR, 0)) 1467 return false; 1468 1469 res = _cfg80211_chandef_usable(wiphy, chandef, 1470 prohibited_flags, 1471 permitting_flags); 1472 1473 trace_cfg80211_return_bool(res); 1474 return res; 1475 } 1476 1477 bool cfg80211_reg_check_beaconing(struct wiphy *wiphy, 1478 struct cfg80211_chan_def *chandef, 1479 struct cfg80211_beaconing_check_config *cfg) 1480 { 1481 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1482 u32 permitting_flags = 0; 1483 bool check_no_ir = true; 1484 1485 /* 1486 * Under certain conditions suggested by some regulatory bodies a 1487 * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag 1488 * only if such relaxations are not enabled and the conditions are not 1489 * met. 1490 */ 1491 if (cfg->relax) { 1492 lockdep_assert_held(&rdev->wiphy.mtx); 1493 check_no_ir = !cfg80211_ir_permissive_chan(wiphy, cfg->iftype, 1494 chandef->chan); 1495 } 1496 1497 if (cfg->reg_power == IEEE80211_REG_VLP_AP) 1498 permitting_flags |= IEEE80211_CHAN_ALLOW_6GHZ_VLP_AP; 1499 1500 return _cfg80211_reg_can_beacon(wiphy, chandef, cfg->iftype, 1501 check_no_ir ? IEEE80211_CHAN_NO_IR : 0, 1502 permitting_flags); 1503 } 1504 EXPORT_SYMBOL(cfg80211_reg_check_beaconing); 1505 1506 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, 1507 struct net_device *dev, 1508 struct cfg80211_chan_def *chandef) 1509 { 1510 if (!rdev->ops->set_monitor_channel) 1511 return -EOPNOTSUPP; 1512 if (!cfg80211_has_monitors_only(rdev)) 1513 return -EBUSY; 1514 1515 return rdev_set_monitor_channel(rdev, dev, chandef); 1516 } 1517 1518 bool cfg80211_any_usable_channels(struct wiphy *wiphy, 1519 unsigned long sband_mask, 1520 u32 prohibited_flags) 1521 { 1522 int idx; 1523 1524 prohibited_flags |= IEEE80211_CHAN_DISABLED; 1525 1526 for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) { 1527 struct ieee80211_supported_band *sband = wiphy->bands[idx]; 1528 int chanidx; 1529 1530 if (!sband) 1531 continue; 1532 1533 for (chanidx = 0; chanidx < sband->n_channels; chanidx++) { 1534 struct ieee80211_channel *chan; 1535 1536 chan = &sband->channels[chanidx]; 1537 1538 if (chan->flags & prohibited_flags) 1539 continue; 1540 1541 return true; 1542 } 1543 } 1544 1545 return false; 1546 } 1547 EXPORT_SYMBOL(cfg80211_any_usable_channels); 1548 1549 struct cfg80211_chan_def *wdev_chandef(struct wireless_dev *wdev, 1550 unsigned int link_id) 1551 { 1552 lockdep_assert_wiphy(wdev->wiphy); 1553 1554 WARN_ON(wdev->valid_links && !(wdev->valid_links & BIT(link_id))); 1555 WARN_ON(!wdev->valid_links && link_id > 0); 1556 1557 switch (wdev->iftype) { 1558 case NL80211_IFTYPE_MESH_POINT: 1559 return &wdev->u.mesh.chandef; 1560 case NL80211_IFTYPE_ADHOC: 1561 return &wdev->u.ibss.chandef; 1562 case NL80211_IFTYPE_OCB: 1563 return &wdev->u.ocb.chandef; 1564 case NL80211_IFTYPE_AP: 1565 case NL80211_IFTYPE_P2P_GO: 1566 return &wdev->links[link_id].ap.chandef; 1567 default: 1568 return NULL; 1569 } 1570 } 1571 EXPORT_SYMBOL(wdev_chandef); 1572