1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * cfg80211 scan result handling 4 * 5 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * Copyright 2016 Intel Deutschland GmbH 8 * Copyright (C) 2018-2025 Intel Corporation 9 */ 10 #include <linux/kernel.h> 11 #include <linux/slab.h> 12 #include <linux/module.h> 13 #include <linux/netdevice.h> 14 #include <linux/wireless.h> 15 #include <linux/nl80211.h> 16 #include <linux/etherdevice.h> 17 #include <linux/crc32.h> 18 #include <linux/bitfield.h> 19 #include <net/arp.h> 20 #include <net/cfg80211.h> 21 #include <net/cfg80211-wext.h> 22 #include <net/iw_handler.h> 23 #include <kunit/visibility.h> 24 #include "core.h" 25 #include "nl80211.h" 26 #include "wext-compat.h" 27 #include "rdev-ops.h" 28 29 /** 30 * DOC: BSS tree/list structure 31 * 32 * At the top level, the BSS list is kept in both a list in each 33 * registered device (@bss_list) as well as an RB-tree for faster 34 * lookup. In the RB-tree, entries can be looked up using their 35 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID 36 * for other BSSes. 37 * 38 * Due to the possibility of hidden SSIDs, there's a second level 39 * structure, the "hidden_list" and "hidden_beacon_bss" pointer. 40 * The hidden_list connects all BSSes belonging to a single AP 41 * that has a hidden SSID, and connects beacon and probe response 42 * entries. For a probe response entry for a hidden SSID, the 43 * hidden_beacon_bss pointer points to the BSS struct holding the 44 * beacon's information. 45 * 46 * Reference counting is done for all these references except for 47 * the hidden_list, so that a beacon BSS struct that is otherwise 48 * not referenced has one reference for being on the bss_list and 49 * one for each probe response entry that points to it using the 50 * hidden_beacon_bss pointer. When a BSS struct that has such a 51 * pointer is get/put, the refcount update is also propagated to 52 * the referenced struct, this ensure that it cannot get removed 53 * while somebody is using the probe response version. 54 * 55 * Note that the hidden_beacon_bss pointer never changes, due to 56 * the reference counting. Therefore, no locking is needed for 57 * it. 58 * 59 * Also note that the hidden_beacon_bss pointer is only relevant 60 * if the driver uses something other than the IEs, e.g. private 61 * data stored in the BSS struct, since the beacon IEs are 62 * also linked into the probe response struct. 63 */ 64 65 /* 66 * Limit the number of BSS entries stored in mac80211. Each one is 67 * a bit over 4k at most, so this limits to roughly 4-5M of memory. 68 * If somebody wants to really attack this though, they'd likely 69 * use small beacons, and only one type of frame, limiting each of 70 * the entries to a much smaller size (in order to generate more 71 * entries in total, so overhead is bigger.) 72 */ 73 static int bss_entries_limit = 1000; 74 module_param(bss_entries_limit, int, 0644); 75 MODULE_PARM_DESC(bss_entries_limit, 76 "limit to number of scan BSS entries (per wiphy, default 1000)"); 77 78 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ) 79 80 static void bss_free(struct cfg80211_internal_bss *bss) 81 { 82 struct cfg80211_bss_ies *ies; 83 84 if (WARN_ON(atomic_read(&bss->hold))) 85 return; 86 87 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies); 88 if (ies && !bss->pub.hidden_beacon_bss) 89 kfree_rcu(ies, rcu_head); 90 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies); 91 if (ies) 92 kfree_rcu(ies, rcu_head); 93 94 /* 95 * This happens when the module is removed, it doesn't 96 * really matter any more save for completeness 97 */ 98 if (!list_empty(&bss->hidden_list)) 99 list_del(&bss->hidden_list); 100 101 kfree(bss); 102 } 103 104 static inline void bss_ref_get(struct cfg80211_registered_device *rdev, 105 struct cfg80211_internal_bss *bss) 106 { 107 lockdep_assert_held(&rdev->bss_lock); 108 109 bss->refcount++; 110 111 if (bss->pub.hidden_beacon_bss) 112 bss_from_pub(bss->pub.hidden_beacon_bss)->refcount++; 113 114 if (bss->pub.transmitted_bss) 115 bss_from_pub(bss->pub.transmitted_bss)->refcount++; 116 } 117 118 static inline void bss_ref_put(struct cfg80211_registered_device *rdev, 119 struct cfg80211_internal_bss *bss) 120 { 121 lockdep_assert_held(&rdev->bss_lock); 122 123 if (bss->pub.hidden_beacon_bss) { 124 struct cfg80211_internal_bss *hbss; 125 126 hbss = bss_from_pub(bss->pub.hidden_beacon_bss); 127 hbss->refcount--; 128 if (hbss->refcount == 0) 129 bss_free(hbss); 130 } 131 132 if (bss->pub.transmitted_bss) { 133 struct cfg80211_internal_bss *tbss; 134 135 tbss = bss_from_pub(bss->pub.transmitted_bss); 136 tbss->refcount--; 137 if (tbss->refcount == 0) 138 bss_free(tbss); 139 } 140 141 bss->refcount--; 142 if (bss->refcount == 0) 143 bss_free(bss); 144 } 145 146 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev, 147 struct cfg80211_internal_bss *bss) 148 { 149 lockdep_assert_held(&rdev->bss_lock); 150 151 if (!list_empty(&bss->hidden_list)) { 152 /* 153 * don't remove the beacon entry if it has 154 * probe responses associated with it 155 */ 156 if (!bss->pub.hidden_beacon_bss) 157 return false; 158 /* 159 * if it's a probe response entry break its 160 * link to the other entries in the group 161 */ 162 list_del_init(&bss->hidden_list); 163 } 164 165 list_del_init(&bss->list); 166 list_del_init(&bss->pub.nontrans_list); 167 rb_erase(&bss->rbn, &rdev->bss_tree); 168 rdev->bss_entries--; 169 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list), 170 "rdev bss entries[%d]/list[empty:%d] corruption\n", 171 rdev->bss_entries, list_empty(&rdev->bss_list)); 172 bss_ref_put(rdev, bss); 173 return true; 174 } 175 176 bool cfg80211_is_element_inherited(const struct element *elem, 177 const struct element *non_inherit_elem) 178 { 179 u8 id_len, ext_id_len, i, loop_len, id; 180 const u8 *list; 181 182 if (elem->id == WLAN_EID_MULTIPLE_BSSID) 183 return false; 184 185 if (elem->id == WLAN_EID_EXTENSION && elem->datalen > 1 && 186 elem->data[0] == WLAN_EID_EXT_EHT_MULTI_LINK) 187 return false; 188 189 if (!non_inherit_elem || non_inherit_elem->datalen < 2) 190 return true; 191 192 /* 193 * non inheritance element format is: 194 * ext ID (56) | IDs list len | list | extension IDs list len | list 195 * Both lists are optional. Both lengths are mandatory. 196 * This means valid length is: 197 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths 198 */ 199 id_len = non_inherit_elem->data[1]; 200 if (non_inherit_elem->datalen < 3 + id_len) 201 return true; 202 203 ext_id_len = non_inherit_elem->data[2 + id_len]; 204 if (non_inherit_elem->datalen < 3 + id_len + ext_id_len) 205 return true; 206 207 if (elem->id == WLAN_EID_EXTENSION) { 208 if (!ext_id_len) 209 return true; 210 loop_len = ext_id_len; 211 list = &non_inherit_elem->data[3 + id_len]; 212 id = elem->data[0]; 213 } else { 214 if (!id_len) 215 return true; 216 loop_len = id_len; 217 list = &non_inherit_elem->data[2]; 218 id = elem->id; 219 } 220 221 for (i = 0; i < loop_len; i++) { 222 if (list[i] == id) 223 return false; 224 } 225 226 return true; 227 } 228 EXPORT_SYMBOL(cfg80211_is_element_inherited); 229 230 static size_t cfg80211_copy_elem_with_frags(const struct element *elem, 231 const u8 *ie, size_t ie_len, 232 u8 **pos, u8 *buf, size_t buf_len) 233 { 234 if (WARN_ON((u8 *)elem < ie || elem->data > ie + ie_len || 235 elem->data + elem->datalen > ie + ie_len)) 236 return 0; 237 238 if (elem->datalen + 2 > buf + buf_len - *pos) 239 return 0; 240 241 memcpy(*pos, elem, elem->datalen + 2); 242 *pos += elem->datalen + 2; 243 244 /* Finish if it is not fragmented */ 245 if (elem->datalen != 255) 246 return *pos - buf; 247 248 ie_len = ie + ie_len - elem->data - elem->datalen; 249 ie = (const u8 *)elem->data + elem->datalen; 250 251 for_each_element(elem, ie, ie_len) { 252 if (elem->id != WLAN_EID_FRAGMENT) 253 break; 254 255 if (elem->datalen + 2 > buf + buf_len - *pos) 256 return 0; 257 258 memcpy(*pos, elem, elem->datalen + 2); 259 *pos += elem->datalen + 2; 260 261 if (elem->datalen != 255) 262 break; 263 } 264 265 return *pos - buf; 266 } 267 268 VISIBLE_IF_CFG80211_KUNIT size_t 269 cfg80211_gen_new_ie(const u8 *ie, size_t ielen, 270 const u8 *subie, size_t subie_len, 271 u8 *new_ie, size_t new_ie_len) 272 { 273 const struct element *non_inherit_elem, *parent, *sub; 274 u8 *pos = new_ie; 275 const u8 *mbssid_index_ie; 276 u8 id, ext_id, bssid_index = 255; 277 unsigned int match_len; 278 279 non_inherit_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, 280 subie, subie_len); 281 282 mbssid_index_ie = cfg80211_find_ie(WLAN_EID_MULTI_BSSID_IDX, subie, 283 subie_len); 284 if (mbssid_index_ie && mbssid_index_ie[1] > 0 && 285 mbssid_index_ie[2] > 0 && mbssid_index_ie[2] <= 46) 286 bssid_index = mbssid_index_ie[2]; 287 288 /* We copy the elements one by one from the parent to the generated 289 * elements. 290 * If they are not inherited (included in subie or in the non 291 * inheritance element), then we copy all occurrences the first time 292 * we see this element type. 293 */ 294 for_each_element(parent, ie, ielen) { 295 if (parent->id == WLAN_EID_FRAGMENT) 296 continue; 297 298 if (parent->id == WLAN_EID_EXTENSION) { 299 if (parent->datalen < 1) 300 continue; 301 302 id = WLAN_EID_EXTENSION; 303 ext_id = parent->data[0]; 304 match_len = 1; 305 } else { 306 id = parent->id; 307 match_len = 0; 308 } 309 310 /* Find first occurrence in subie */ 311 sub = cfg80211_find_elem_match(id, subie, subie_len, 312 &ext_id, match_len, 0); 313 314 /* Copy from parent if not in subie and inherited */ 315 if (!sub && 316 cfg80211_is_element_inherited(parent, non_inherit_elem)) { 317 if (!cfg80211_copy_elem_with_frags(parent, 318 ie, ielen, 319 &pos, new_ie, 320 new_ie_len)) 321 return 0; 322 323 continue; 324 } 325 326 /* For ML probe response, match the MLE in the frame body with 327 * MLD id being 'bssid_index' 328 */ 329 if (parent->id == WLAN_EID_EXTENSION && parent->datalen > 1 && 330 parent->data[0] == WLAN_EID_EXT_EHT_MULTI_LINK && 331 bssid_index == ieee80211_mle_get_mld_id(parent->data + 1)) { 332 if (!cfg80211_copy_elem_with_frags(parent, 333 ie, ielen, 334 &pos, new_ie, 335 new_ie_len)) 336 return 0; 337 338 /* Continue here to prevent processing the MLE in 339 * sub-element, which AP MLD should not carry 340 */ 341 continue; 342 } 343 344 /* Already copied if an earlier element had the same type */ 345 if (cfg80211_find_elem_match(id, ie, (u8 *)parent - ie, 346 &ext_id, match_len, 0)) 347 continue; 348 349 /* Not inheriting, copy all similar elements from subie */ 350 while (sub) { 351 if (!cfg80211_copy_elem_with_frags(sub, 352 subie, subie_len, 353 &pos, new_ie, 354 new_ie_len)) 355 return 0; 356 357 sub = cfg80211_find_elem_match(id, 358 sub->data + sub->datalen, 359 subie_len + subie - 360 (sub->data + 361 sub->datalen), 362 &ext_id, match_len, 0); 363 } 364 } 365 366 /* The above misses elements that are included in subie but not in the 367 * parent, so do a pass over subie and append those. 368 * Skip the non-tx BSSID caps and non-inheritance element. 369 */ 370 for_each_element(sub, subie, subie_len) { 371 if (sub->id == WLAN_EID_NON_TX_BSSID_CAP) 372 continue; 373 374 if (sub->id == WLAN_EID_FRAGMENT) 375 continue; 376 377 if (sub->id == WLAN_EID_EXTENSION) { 378 if (sub->datalen < 1) 379 continue; 380 381 id = WLAN_EID_EXTENSION; 382 ext_id = sub->data[0]; 383 match_len = 1; 384 385 if (ext_id == WLAN_EID_EXT_NON_INHERITANCE) 386 continue; 387 } else { 388 id = sub->id; 389 match_len = 0; 390 } 391 392 /* Processed if one was included in the parent */ 393 if (cfg80211_find_elem_match(id, ie, ielen, 394 &ext_id, match_len, 0)) 395 continue; 396 397 if (!cfg80211_copy_elem_with_frags(sub, subie, subie_len, 398 &pos, new_ie, new_ie_len)) 399 return 0; 400 } 401 402 return pos - new_ie; 403 } 404 EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_gen_new_ie); 405 406 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, 407 const u8 *ssid, size_t ssid_len) 408 { 409 const struct cfg80211_bss_ies *ies; 410 const struct element *ssid_elem; 411 412 if (bssid && !ether_addr_equal(a->bssid, bssid)) 413 return false; 414 415 if (!ssid) 416 return true; 417 418 ies = rcu_access_pointer(a->ies); 419 if (!ies) 420 return false; 421 ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); 422 if (!ssid_elem) 423 return false; 424 if (ssid_elem->datalen != ssid_len) 425 return false; 426 return memcmp(ssid_elem->data, ssid, ssid_len) == 0; 427 } 428 429 static int 430 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss, 431 struct cfg80211_bss *nontrans_bss) 432 { 433 const struct element *ssid_elem; 434 struct cfg80211_bss *bss = NULL; 435 436 rcu_read_lock(); 437 ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID); 438 if (!ssid_elem) { 439 rcu_read_unlock(); 440 return -EINVAL; 441 } 442 443 /* check if nontrans_bss is in the list */ 444 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) { 445 if (is_bss(bss, nontrans_bss->bssid, ssid_elem->data, 446 ssid_elem->datalen)) { 447 rcu_read_unlock(); 448 return 0; 449 } 450 } 451 452 rcu_read_unlock(); 453 454 /* 455 * This is a bit weird - it's not on the list, but already on another 456 * one! The only way that could happen is if there's some BSSID/SSID 457 * shared by multiple APs in their multi-BSSID profiles, potentially 458 * with hidden SSID mixed in ... ignore it. 459 */ 460 if (!list_empty(&nontrans_bss->nontrans_list)) 461 return -EINVAL; 462 463 /* add to the list */ 464 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list); 465 return 0; 466 } 467 468 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, 469 unsigned long expire_time) 470 { 471 struct cfg80211_internal_bss *bss, *tmp; 472 bool expired = false; 473 474 lockdep_assert_held(&rdev->bss_lock); 475 476 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { 477 if (atomic_read(&bss->hold)) 478 continue; 479 if (!time_after(expire_time, bss->ts)) 480 continue; 481 482 if (__cfg80211_unlink_bss(rdev, bss)) 483 expired = true; 484 } 485 486 if (expired) 487 rdev->bss_generation++; 488 } 489 490 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) 491 { 492 struct cfg80211_internal_bss *bss, *oldest = NULL; 493 bool ret; 494 495 lockdep_assert_held(&rdev->bss_lock); 496 497 list_for_each_entry(bss, &rdev->bss_list, list) { 498 if (atomic_read(&bss->hold)) 499 continue; 500 501 if (!list_empty(&bss->hidden_list) && 502 !bss->pub.hidden_beacon_bss) 503 continue; 504 505 if (oldest && time_before(oldest->ts, bss->ts)) 506 continue; 507 oldest = bss; 508 } 509 510 if (WARN_ON(!oldest)) 511 return false; 512 513 /* 514 * The callers make sure to increase rdev->bss_generation if anything 515 * gets removed (and a new entry added), so there's no need to also do 516 * it here. 517 */ 518 519 ret = __cfg80211_unlink_bss(rdev, oldest); 520 WARN_ON(!ret); 521 return ret; 522 } 523 524 static u8 cfg80211_parse_bss_param(u8 data, 525 struct cfg80211_colocated_ap *coloc_ap) 526 { 527 coloc_ap->oct_recommended = 528 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED); 529 coloc_ap->same_ssid = 530 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID); 531 coloc_ap->multi_bss = 532 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID); 533 coloc_ap->transmitted_bssid = 534 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID); 535 coloc_ap->unsolicited_probe = 536 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE); 537 coloc_ap->colocated_ess = 538 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS); 539 540 return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP); 541 } 542 543 static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies, 544 const struct element **elem, u32 *s_ssid) 545 { 546 547 *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); 548 if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN) 549 return -EINVAL; 550 551 *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen); 552 return 0; 553 } 554 555 VISIBLE_IF_CFG80211_KUNIT void 556 cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list) 557 { 558 struct cfg80211_colocated_ap *ap, *tmp_ap; 559 560 list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) { 561 list_del(&ap->list); 562 kfree(ap); 563 } 564 } 565 EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_free_coloc_ap_list); 566 567 static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry, 568 const u8 *pos, u8 length, 569 const struct element *ssid_elem, 570 u32 s_ssid_tmp) 571 { 572 u8 bss_params; 573 574 entry->psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED; 575 576 /* The length is already verified by the caller to contain bss_params */ 577 if (length > sizeof(struct ieee80211_tbtt_info_7_8_9)) { 578 struct ieee80211_tbtt_info_ge_11 *tbtt_info = (void *)pos; 579 580 memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN); 581 entry->short_ssid = le32_to_cpu(tbtt_info->short_ssid); 582 entry->short_ssid_valid = true; 583 584 bss_params = tbtt_info->bss_params; 585 586 /* Ignore disabled links */ 587 if (length >= offsetofend(typeof(*tbtt_info), mld_params)) { 588 if (le16_get_bits(tbtt_info->mld_params.params, 589 IEEE80211_RNR_MLD_PARAMS_DISABLED_LINK)) 590 return -EINVAL; 591 } 592 593 if (length >= offsetofend(struct ieee80211_tbtt_info_ge_11, 594 psd_20)) 595 entry->psd_20 = tbtt_info->psd_20; 596 } else { 597 struct ieee80211_tbtt_info_7_8_9 *tbtt_info = (void *)pos; 598 599 memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN); 600 601 bss_params = tbtt_info->bss_params; 602 603 if (length == offsetofend(struct ieee80211_tbtt_info_7_8_9, 604 psd_20)) 605 entry->psd_20 = tbtt_info->psd_20; 606 } 607 608 /* ignore entries with invalid BSSID */ 609 if (!is_valid_ether_addr(entry->bssid)) 610 return -EINVAL; 611 612 /* skip non colocated APs */ 613 if (!cfg80211_parse_bss_param(bss_params, entry)) 614 return -EINVAL; 615 616 /* no information about the short ssid. Consider the entry valid 617 * for now. It would later be dropped in case there are explicit 618 * SSIDs that need to be matched 619 */ 620 if (!entry->same_ssid && !entry->short_ssid_valid) 621 return 0; 622 623 if (entry->same_ssid) { 624 entry->short_ssid = s_ssid_tmp; 625 entry->short_ssid_valid = true; 626 627 /* 628 * This is safe because we validate datalen in 629 * cfg80211_parse_colocated_ap(), before calling this 630 * function. 631 */ 632 memcpy(&entry->ssid, &ssid_elem->data, ssid_elem->datalen); 633 entry->ssid_len = ssid_elem->datalen; 634 } 635 636 return 0; 637 } 638 639 bool cfg80211_iter_rnr(const u8 *elems, size_t elems_len, 640 enum cfg80211_rnr_iter_ret 641 (*iter)(void *data, u8 type, 642 const struct ieee80211_neighbor_ap_info *info, 643 const u8 *tbtt_info, u8 tbtt_info_len), 644 void *iter_data) 645 { 646 const struct element *rnr; 647 const u8 *pos, *end; 648 649 for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT, 650 elems, elems_len) { 651 const struct ieee80211_neighbor_ap_info *info; 652 653 pos = rnr->data; 654 end = rnr->data + rnr->datalen; 655 656 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */ 657 while (sizeof(*info) <= end - pos) { 658 u8 length, i, count; 659 u8 type; 660 661 info = (void *)pos; 662 count = u8_get_bits(info->tbtt_info_hdr, 663 IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 664 1; 665 length = info->tbtt_info_len; 666 667 pos += sizeof(*info); 668 669 if (count * length > end - pos) 670 return false; 671 672 type = u8_get_bits(info->tbtt_info_hdr, 673 IEEE80211_AP_INFO_TBTT_HDR_TYPE); 674 675 for (i = 0; i < count; i++) { 676 switch (iter(iter_data, type, info, 677 pos, length)) { 678 case RNR_ITER_CONTINUE: 679 break; 680 case RNR_ITER_BREAK: 681 return true; 682 case RNR_ITER_ERROR: 683 return false; 684 } 685 686 pos += length; 687 } 688 } 689 690 if (pos != end) 691 return false; 692 } 693 694 return true; 695 } 696 EXPORT_SYMBOL_GPL(cfg80211_iter_rnr); 697 698 struct colocated_ap_data { 699 const struct element *ssid_elem; 700 struct list_head ap_list; 701 u32 s_ssid_tmp; 702 int n_coloc; 703 }; 704 705 static enum cfg80211_rnr_iter_ret 706 cfg80211_parse_colocated_ap_iter(void *_data, u8 type, 707 const struct ieee80211_neighbor_ap_info *info, 708 const u8 *tbtt_info, u8 tbtt_info_len) 709 { 710 struct colocated_ap_data *data = _data; 711 struct cfg80211_colocated_ap *entry; 712 enum nl80211_band band; 713 714 if (type != IEEE80211_TBTT_INFO_TYPE_TBTT) 715 return RNR_ITER_CONTINUE; 716 717 if (!ieee80211_operating_class_to_band(info->op_class, &band)) 718 return RNR_ITER_CONTINUE; 719 720 /* TBTT info must include bss param + BSSID + (short SSID or 721 * same_ssid bit to be set). Ignore other options, and move to 722 * the next AP info 723 */ 724 if (band != NL80211_BAND_6GHZ || 725 !(tbtt_info_len == offsetofend(struct ieee80211_tbtt_info_7_8_9, 726 bss_params) || 727 tbtt_info_len == sizeof(struct ieee80211_tbtt_info_7_8_9) || 728 tbtt_info_len >= offsetofend(struct ieee80211_tbtt_info_ge_11, 729 bss_params))) 730 return RNR_ITER_CONTINUE; 731 732 entry = kzalloc(sizeof(*entry), GFP_ATOMIC); 733 if (!entry) 734 return RNR_ITER_ERROR; 735 736 entry->center_freq = 737 ieee80211_channel_to_frequency(info->channel, band); 738 739 if (!cfg80211_parse_ap_info(entry, tbtt_info, tbtt_info_len, 740 data->ssid_elem, data->s_ssid_tmp)) { 741 struct cfg80211_colocated_ap *tmp; 742 743 /* Don't add duplicate BSSIDs on the same channel. */ 744 list_for_each_entry(tmp, &data->ap_list, list) { 745 if (ether_addr_equal(tmp->bssid, entry->bssid) && 746 tmp->center_freq == entry->center_freq) { 747 kfree(entry); 748 return RNR_ITER_CONTINUE; 749 } 750 } 751 752 data->n_coloc++; 753 list_add_tail(&entry->list, &data->ap_list); 754 } else { 755 kfree(entry); 756 } 757 758 return RNR_ITER_CONTINUE; 759 } 760 761 VISIBLE_IF_CFG80211_KUNIT int 762 cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies, 763 struct list_head *list) 764 { 765 struct colocated_ap_data data = {}; 766 int ret; 767 768 INIT_LIST_HEAD(&data.ap_list); 769 770 ret = cfg80211_calc_short_ssid(ies, &data.ssid_elem, &data.s_ssid_tmp); 771 if (ret) 772 return 0; 773 774 if (!cfg80211_iter_rnr(ies->data, ies->len, 775 cfg80211_parse_colocated_ap_iter, &data)) { 776 cfg80211_free_coloc_ap_list(&data.ap_list); 777 return 0; 778 } 779 780 list_splice_tail(&data.ap_list, list); 781 return data.n_coloc; 782 } 783 EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_parse_colocated_ap); 784 785 static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request, 786 struct ieee80211_channel *chan, 787 bool add_to_6ghz) 788 { 789 int i; 790 u32 n_channels = request->n_channels; 791 struct cfg80211_scan_6ghz_params *params = 792 &request->scan_6ghz_params[request->n_6ghz_params]; 793 794 for (i = 0; i < n_channels; i++) { 795 if (request->channels[i] == chan) { 796 if (add_to_6ghz) 797 params->channel_idx = i; 798 return; 799 } 800 } 801 802 request->n_channels++; 803 request->channels[n_channels] = chan; 804 if (add_to_6ghz) 805 request->scan_6ghz_params[request->n_6ghz_params].channel_idx = 806 n_channels; 807 } 808 809 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap, 810 struct cfg80211_scan_request *request) 811 { 812 int i; 813 u32 s_ssid; 814 815 for (i = 0; i < request->n_ssids; i++) { 816 /* wildcard ssid in the scan request */ 817 if (!request->ssids[i].ssid_len) { 818 if (ap->multi_bss && !ap->transmitted_bssid) 819 continue; 820 821 return true; 822 } 823 824 if (ap->ssid_len && 825 ap->ssid_len == request->ssids[i].ssid_len) { 826 if (!memcmp(request->ssids[i].ssid, ap->ssid, 827 ap->ssid_len)) 828 return true; 829 } else if (ap->short_ssid_valid) { 830 s_ssid = ~crc32_le(~0, request->ssids[i].ssid, 831 request->ssids[i].ssid_len); 832 833 if (ap->short_ssid == s_ssid) 834 return true; 835 } 836 } 837 838 return false; 839 } 840 841 static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev, 842 bool first_part) 843 { 844 u8 i; 845 struct cfg80211_colocated_ap *ap; 846 int n_channels, count = 0, err; 847 struct cfg80211_scan_request_int *request, *rdev_req = rdev->scan_req; 848 LIST_HEAD(coloc_ap_list); 849 bool need_scan_psc = true; 850 const struct ieee80211_sband_iftype_data *iftd; 851 size_t size, offs_ssids, offs_6ghz_params, offs_ies; 852 853 rdev_req->req.scan_6ghz = true; 854 rdev_req->req.first_part = first_part; 855 856 if (!rdev->wiphy.bands[NL80211_BAND_6GHZ]) 857 return -EOPNOTSUPP; 858 859 iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ], 860 rdev_req->req.wdev->iftype); 861 if (!iftd || !iftd->he_cap.has_he) 862 return -EOPNOTSUPP; 863 864 n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels; 865 866 if (rdev_req->req.flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) { 867 struct cfg80211_internal_bss *intbss; 868 869 spin_lock_bh(&rdev->bss_lock); 870 list_for_each_entry(intbss, &rdev->bss_list, list) { 871 struct cfg80211_bss *res = &intbss->pub; 872 const struct cfg80211_bss_ies *ies; 873 const struct element *ssid_elem; 874 struct cfg80211_colocated_ap *entry; 875 u32 s_ssid_tmp; 876 int ret; 877 878 ies = rcu_access_pointer(res->ies); 879 count += cfg80211_parse_colocated_ap(ies, 880 &coloc_ap_list); 881 882 /* In case the scan request specified a specific BSSID 883 * and the BSS is found and operating on 6GHz band then 884 * add this AP to the collocated APs list. 885 * This is relevant for ML probe requests when the lower 886 * band APs have not been discovered. 887 */ 888 if (is_broadcast_ether_addr(rdev_req->req.bssid) || 889 !ether_addr_equal(rdev_req->req.bssid, res->bssid) || 890 res->channel->band != NL80211_BAND_6GHZ) 891 continue; 892 893 ret = cfg80211_calc_short_ssid(ies, &ssid_elem, 894 &s_ssid_tmp); 895 if (ret) 896 continue; 897 898 entry = kzalloc(sizeof(*entry), GFP_ATOMIC); 899 if (!entry) 900 continue; 901 902 memcpy(entry->bssid, res->bssid, ETH_ALEN); 903 entry->short_ssid = s_ssid_tmp; 904 memcpy(entry->ssid, ssid_elem->data, 905 ssid_elem->datalen); 906 entry->ssid_len = ssid_elem->datalen; 907 entry->short_ssid_valid = true; 908 entry->center_freq = res->channel->center_freq; 909 910 list_add_tail(&entry->list, &coloc_ap_list); 911 count++; 912 } 913 spin_unlock_bh(&rdev->bss_lock); 914 } 915 916 size = struct_size(request, req.channels, n_channels); 917 offs_ssids = size; 918 size += sizeof(*request->req.ssids) * rdev_req->req.n_ssids; 919 offs_6ghz_params = size; 920 size += sizeof(*request->req.scan_6ghz_params) * count; 921 offs_ies = size; 922 size += rdev_req->req.ie_len; 923 924 request = kzalloc(size, GFP_KERNEL); 925 if (!request) { 926 cfg80211_free_coloc_ap_list(&coloc_ap_list); 927 return -ENOMEM; 928 } 929 930 *request = *rdev_req; 931 request->req.n_channels = 0; 932 request->req.n_6ghz_params = 0; 933 if (rdev_req->req.n_ssids) { 934 /* 935 * Add the ssids from the parent scan request to the new 936 * scan request, so the driver would be able to use them 937 * in its probe requests to discover hidden APs on PSC 938 * channels. 939 */ 940 request->req.ssids = (void *)request + offs_ssids; 941 memcpy(request->req.ssids, rdev_req->req.ssids, 942 sizeof(*request->req.ssids) * request->req.n_ssids); 943 } 944 request->req.scan_6ghz_params = (void *)request + offs_6ghz_params; 945 946 if (rdev_req->req.ie_len) { 947 void *ie = (void *)request + offs_ies; 948 949 memcpy(ie, rdev_req->req.ie, rdev_req->req.ie_len); 950 request->req.ie = ie; 951 } 952 953 /* 954 * PSC channels should not be scanned in case of direct scan with 1 SSID 955 * and at least one of the reported co-located APs with same SSID 956 * indicating that all APs in the same ESS are co-located 957 */ 958 if (count && 959 request->req.n_ssids == 1 && 960 request->req.ssids[0].ssid_len) { 961 list_for_each_entry(ap, &coloc_ap_list, list) { 962 if (ap->colocated_ess && 963 cfg80211_find_ssid_match(ap, &request->req)) { 964 need_scan_psc = false; 965 break; 966 } 967 } 968 } 969 970 /* 971 * add to the scan request the channels that need to be scanned 972 * regardless of the collocated APs (PSC channels or all channels 973 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set) 974 */ 975 for (i = 0; i < rdev_req->req.n_channels; i++) { 976 if (rdev_req->req.channels[i]->band == NL80211_BAND_6GHZ && 977 ((need_scan_psc && 978 cfg80211_channel_is_psc(rdev_req->req.channels[i])) || 979 !(rdev_req->req.flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) { 980 cfg80211_scan_req_add_chan(&request->req, 981 rdev_req->req.channels[i], 982 false); 983 } 984 } 985 986 if (!(rdev_req->req.flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ)) 987 goto skip; 988 989 list_for_each_entry(ap, &coloc_ap_list, list) { 990 bool found = false; 991 struct cfg80211_scan_6ghz_params *scan_6ghz_params = 992 &request->req.scan_6ghz_params[request->req.n_6ghz_params]; 993 struct ieee80211_channel *chan = 994 ieee80211_get_channel(&rdev->wiphy, ap->center_freq); 995 996 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED || 997 !cfg80211_wdev_channel_allowed(rdev_req->req.wdev, chan)) 998 continue; 999 1000 for (i = 0; i < rdev_req->req.n_channels; i++) { 1001 if (rdev_req->req.channels[i] == chan) 1002 found = true; 1003 } 1004 1005 if (!found) 1006 continue; 1007 1008 if (request->req.n_ssids > 0 && 1009 !cfg80211_find_ssid_match(ap, &request->req)) 1010 continue; 1011 1012 if (!is_broadcast_ether_addr(request->req.bssid) && 1013 !ether_addr_equal(request->req.bssid, ap->bssid)) 1014 continue; 1015 1016 if (!request->req.n_ssids && ap->multi_bss && 1017 !ap->transmitted_bssid) 1018 continue; 1019 1020 cfg80211_scan_req_add_chan(&request->req, chan, true); 1021 memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN); 1022 scan_6ghz_params->short_ssid = ap->short_ssid; 1023 scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid; 1024 scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe; 1025 scan_6ghz_params->psd_20 = ap->psd_20; 1026 1027 /* 1028 * If a PSC channel is added to the scan and 'need_scan_psc' is 1029 * set to false, then all the APs that the scan logic is 1030 * interested with on the channel are collocated and thus there 1031 * is no need to perform the initial PSC channel listen. 1032 */ 1033 if (cfg80211_channel_is_psc(chan) && !need_scan_psc) 1034 scan_6ghz_params->psc_no_listen = true; 1035 1036 request->req.n_6ghz_params++; 1037 } 1038 1039 skip: 1040 cfg80211_free_coloc_ap_list(&coloc_ap_list); 1041 1042 if (request->req.n_channels) { 1043 struct cfg80211_scan_request_int *old = rdev->int_scan_req; 1044 1045 rdev->int_scan_req = request; 1046 1047 /* 1048 * If this scan follows a previous scan, save the scan start 1049 * info from the first part of the scan 1050 */ 1051 if (!first_part && !WARN_ON(!old)) 1052 rdev->int_scan_req->info = old->info; 1053 1054 err = rdev_scan(rdev, request); 1055 if (err) { 1056 rdev->int_scan_req = old; 1057 kfree(request); 1058 } else { 1059 kfree(old); 1060 } 1061 1062 return err; 1063 } 1064 1065 kfree(request); 1066 return -EINVAL; 1067 } 1068 1069 int cfg80211_scan(struct cfg80211_registered_device *rdev) 1070 { 1071 struct cfg80211_scan_request_int *request; 1072 struct cfg80211_scan_request_int *rdev_req = rdev->scan_req; 1073 u32 n_channels = 0, idx, i; 1074 1075 if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ)) { 1076 rdev_req->req.first_part = true; 1077 return rdev_scan(rdev, rdev_req); 1078 } 1079 1080 for (i = 0; i < rdev_req->req.n_channels; i++) { 1081 if (rdev_req->req.channels[i]->band != NL80211_BAND_6GHZ) 1082 n_channels++; 1083 } 1084 1085 if (!n_channels) 1086 return cfg80211_scan_6ghz(rdev, true); 1087 1088 request = kzalloc(struct_size(request, req.channels, n_channels), 1089 GFP_KERNEL); 1090 if (!request) 1091 return -ENOMEM; 1092 1093 *request = *rdev_req; 1094 request->req.n_channels = n_channels; 1095 1096 for (i = idx = 0; i < rdev_req->req.n_channels; i++) { 1097 if (rdev_req->req.channels[i]->band != NL80211_BAND_6GHZ) 1098 request->req.channels[idx++] = 1099 rdev_req->req.channels[i]; 1100 } 1101 1102 rdev_req->req.scan_6ghz = false; 1103 rdev_req->req.first_part = true; 1104 rdev->int_scan_req = request; 1105 return rdev_scan(rdev, request); 1106 } 1107 1108 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, 1109 bool send_message) 1110 { 1111 struct cfg80211_scan_request_int *request, *rdev_req; 1112 struct wireless_dev *wdev; 1113 struct sk_buff *msg; 1114 #ifdef CONFIG_CFG80211_WEXT 1115 union iwreq_data wrqu; 1116 #endif 1117 1118 lockdep_assert_held(&rdev->wiphy.mtx); 1119 1120 if (rdev->scan_msg) { 1121 nl80211_send_scan_msg(rdev, rdev->scan_msg); 1122 rdev->scan_msg = NULL; 1123 return; 1124 } 1125 1126 rdev_req = rdev->scan_req; 1127 if (!rdev_req) 1128 return; 1129 1130 wdev = rdev_req->req.wdev; 1131 request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req; 1132 1133 if (wdev_running(wdev) && 1134 (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) && 1135 !rdev_req->req.scan_6ghz && !request->info.aborted && 1136 !cfg80211_scan_6ghz(rdev, false)) 1137 return; 1138 1139 /* 1140 * This must be before sending the other events! 1141 * Otherwise, wpa_supplicant gets completely confused with 1142 * wext events. 1143 */ 1144 if (wdev->netdev) 1145 cfg80211_sme_scan_done(wdev->netdev); 1146 1147 if (!request->info.aborted && 1148 request->req.flags & NL80211_SCAN_FLAG_FLUSH) { 1149 /* flush entries from previous scans */ 1150 spin_lock_bh(&rdev->bss_lock); 1151 __cfg80211_bss_expire(rdev, request->req.scan_start); 1152 spin_unlock_bh(&rdev->bss_lock); 1153 } 1154 1155 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); 1156 1157 #ifdef CONFIG_CFG80211_WEXT 1158 if (wdev->netdev && !request->info.aborted) { 1159 memset(&wrqu, 0, sizeof(wrqu)); 1160 1161 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); 1162 } 1163 #endif 1164 1165 dev_put(wdev->netdev); 1166 1167 kfree(rdev->int_scan_req); 1168 rdev->int_scan_req = NULL; 1169 1170 kfree(rdev->scan_req); 1171 rdev->scan_req = NULL; 1172 1173 if (!send_message) 1174 rdev->scan_msg = msg; 1175 else 1176 nl80211_send_scan_msg(rdev, msg); 1177 } 1178 1179 void __cfg80211_scan_done(struct wiphy *wiphy, struct wiphy_work *wk) 1180 { 1181 ___cfg80211_scan_done(wiphy_to_rdev(wiphy), true); 1182 } 1183 1184 void cfg80211_scan_done(struct cfg80211_scan_request *request, 1185 struct cfg80211_scan_info *info) 1186 { 1187 struct cfg80211_scan_request_int *intreq = 1188 container_of(request, struct cfg80211_scan_request_int, req); 1189 struct cfg80211_registered_device *rdev = wiphy_to_rdev(request->wiphy); 1190 struct cfg80211_scan_info old_info = intreq->info; 1191 1192 trace_cfg80211_scan_done(intreq, info); 1193 WARN_ON(intreq != rdev->scan_req && 1194 intreq != rdev->int_scan_req); 1195 1196 intreq->info = *info; 1197 1198 /* 1199 * In case the scan is split, the scan_start_tsf and tsf_bssid should 1200 * be of the first part. In such a case old_info.scan_start_tsf should 1201 * be non zero. 1202 */ 1203 if (request->scan_6ghz && old_info.scan_start_tsf) { 1204 intreq->info.scan_start_tsf = old_info.scan_start_tsf; 1205 memcpy(intreq->info.tsf_bssid, old_info.tsf_bssid, 1206 sizeof(intreq->info.tsf_bssid)); 1207 } 1208 1209 intreq->notified = true; 1210 wiphy_work_queue(request->wiphy, &rdev->scan_done_wk); 1211 } 1212 EXPORT_SYMBOL(cfg80211_scan_done); 1213 1214 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, 1215 struct cfg80211_sched_scan_request *req) 1216 { 1217 lockdep_assert_held(&rdev->wiphy.mtx); 1218 1219 list_add_rcu(&req->list, &rdev->sched_scan_req_list); 1220 } 1221 1222 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, 1223 struct cfg80211_sched_scan_request *req) 1224 { 1225 lockdep_assert_held(&rdev->wiphy.mtx); 1226 1227 list_del_rcu(&req->list); 1228 kfree_rcu(req, rcu_head); 1229 } 1230 1231 static struct cfg80211_sched_scan_request * 1232 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) 1233 { 1234 struct cfg80211_sched_scan_request *pos; 1235 1236 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list, 1237 lockdep_is_held(&rdev->wiphy.mtx)) { 1238 if (pos->reqid == reqid) 1239 return pos; 1240 } 1241 return NULL; 1242 } 1243 1244 /* 1245 * Determines if a scheduled scan request can be handled. When a legacy 1246 * scheduled scan is running no other scheduled scan is allowed regardless 1247 * whether the request is for legacy or multi-support scan. When a multi-support 1248 * scheduled scan is running a request for legacy scan is not allowed. In this 1249 * case a request for multi-support scan can be handled if resources are 1250 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. 1251 */ 1252 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, 1253 bool want_multi) 1254 { 1255 struct cfg80211_sched_scan_request *pos; 1256 int i = 0; 1257 1258 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { 1259 /* request id zero means legacy in progress */ 1260 if (!i && !pos->reqid) 1261 return -EINPROGRESS; 1262 i++; 1263 } 1264 1265 if (i) { 1266 /* no legacy allowed when multi request(s) are active */ 1267 if (!want_multi) 1268 return -EINPROGRESS; 1269 1270 /* resource limit reached */ 1271 if (i == rdev->wiphy.max_sched_scan_reqs) 1272 return -ENOSPC; 1273 } 1274 return 0; 1275 } 1276 1277 void cfg80211_sched_scan_results_wk(struct work_struct *work) 1278 { 1279 struct cfg80211_registered_device *rdev; 1280 struct cfg80211_sched_scan_request *req, *tmp; 1281 1282 rdev = container_of(work, struct cfg80211_registered_device, 1283 sched_scan_res_wk); 1284 1285 guard(wiphy)(&rdev->wiphy); 1286 1287 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 1288 if (req->report_results) { 1289 req->report_results = false; 1290 if (req->flags & NL80211_SCAN_FLAG_FLUSH) { 1291 /* flush entries from previous scans */ 1292 spin_lock_bh(&rdev->bss_lock); 1293 __cfg80211_bss_expire(rdev, req->scan_start); 1294 spin_unlock_bh(&rdev->bss_lock); 1295 req->scan_start = jiffies; 1296 } 1297 nl80211_send_sched_scan(req, 1298 NL80211_CMD_SCHED_SCAN_RESULTS); 1299 } 1300 } 1301 } 1302 1303 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) 1304 { 1305 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1306 struct cfg80211_sched_scan_request *request; 1307 1308 trace_cfg80211_sched_scan_results(wiphy, reqid); 1309 /* ignore if we're not scanning */ 1310 1311 rcu_read_lock(); 1312 request = cfg80211_find_sched_scan_req(rdev, reqid); 1313 if (request) { 1314 request->report_results = true; 1315 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); 1316 } 1317 rcu_read_unlock(); 1318 } 1319 EXPORT_SYMBOL(cfg80211_sched_scan_results); 1320 1321 void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid) 1322 { 1323 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1324 1325 lockdep_assert_held(&wiphy->mtx); 1326 1327 trace_cfg80211_sched_scan_stopped(wiphy, reqid); 1328 1329 __cfg80211_stop_sched_scan(rdev, reqid, true); 1330 } 1331 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked); 1332 1333 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) 1334 { 1335 guard(wiphy)(wiphy); 1336 1337 cfg80211_sched_scan_stopped_locked(wiphy, reqid); 1338 } 1339 EXPORT_SYMBOL(cfg80211_sched_scan_stopped); 1340 1341 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, 1342 struct cfg80211_sched_scan_request *req, 1343 bool driver_initiated) 1344 { 1345 lockdep_assert_held(&rdev->wiphy.mtx); 1346 1347 if (!driver_initiated) { 1348 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); 1349 if (err) 1350 return err; 1351 } 1352 1353 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); 1354 1355 cfg80211_del_sched_scan_req(rdev, req); 1356 1357 return 0; 1358 } 1359 1360 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, 1361 u64 reqid, bool driver_initiated) 1362 { 1363 struct cfg80211_sched_scan_request *sched_scan_req; 1364 1365 lockdep_assert_held(&rdev->wiphy.mtx); 1366 1367 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); 1368 if (!sched_scan_req) 1369 return -ENOENT; 1370 1371 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, 1372 driver_initiated); 1373 } 1374 1375 void cfg80211_bss_age(struct cfg80211_registered_device *rdev, 1376 unsigned long age_secs) 1377 { 1378 struct cfg80211_internal_bss *bss; 1379 unsigned long age_jiffies = secs_to_jiffies(age_secs); 1380 1381 spin_lock_bh(&rdev->bss_lock); 1382 list_for_each_entry(bss, &rdev->bss_list, list) 1383 bss->ts -= age_jiffies; 1384 spin_unlock_bh(&rdev->bss_lock); 1385 } 1386 1387 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) 1388 { 1389 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); 1390 } 1391 1392 void cfg80211_bss_flush(struct wiphy *wiphy) 1393 { 1394 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1395 1396 spin_lock_bh(&rdev->bss_lock); 1397 __cfg80211_bss_expire(rdev, jiffies); 1398 spin_unlock_bh(&rdev->bss_lock); 1399 } 1400 EXPORT_SYMBOL(cfg80211_bss_flush); 1401 1402 const struct element * 1403 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len, 1404 const u8 *match, unsigned int match_len, 1405 unsigned int match_offset) 1406 { 1407 const struct element *elem; 1408 1409 for_each_element_id(elem, eid, ies, len) { 1410 if (elem->datalen >= match_offset + match_len && 1411 !memcmp(elem->data + match_offset, match, match_len)) 1412 return elem; 1413 } 1414 1415 return NULL; 1416 } 1417 EXPORT_SYMBOL(cfg80211_find_elem_match); 1418 1419 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type, 1420 const u8 *ies, 1421 unsigned int len) 1422 { 1423 const struct element *elem; 1424 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; 1425 int match_len = (oui_type < 0) ? 3 : sizeof(match); 1426 1427 if (WARN_ON(oui_type > 0xff)) 1428 return NULL; 1429 1430 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, 1431 match, match_len, 0); 1432 1433 if (!elem || elem->datalen < 4) 1434 return NULL; 1435 1436 return elem; 1437 } 1438 EXPORT_SYMBOL(cfg80211_find_vendor_elem); 1439 1440 /** 1441 * enum bss_compare_mode - BSS compare mode 1442 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) 1443 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode 1444 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode 1445 */ 1446 enum bss_compare_mode { 1447 BSS_CMP_REGULAR, 1448 BSS_CMP_HIDE_ZLEN, 1449 BSS_CMP_HIDE_NUL, 1450 }; 1451 1452 static int cmp_bss(struct cfg80211_bss *a, 1453 struct cfg80211_bss *b, 1454 enum bss_compare_mode mode) 1455 { 1456 const struct cfg80211_bss_ies *a_ies, *b_ies; 1457 const u8 *ie1 = NULL; 1458 const u8 *ie2 = NULL; 1459 int i, r; 1460 1461 if (a->channel != b->channel) 1462 return (b->channel->center_freq * 1000 + b->channel->freq_offset) - 1463 (a->channel->center_freq * 1000 + a->channel->freq_offset); 1464 1465 a_ies = rcu_access_pointer(a->ies); 1466 if (!a_ies) 1467 return -1; 1468 b_ies = rcu_access_pointer(b->ies); 1469 if (!b_ies) 1470 return 1; 1471 1472 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 1473 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, 1474 a_ies->data, a_ies->len); 1475 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) 1476 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, 1477 b_ies->data, b_ies->len); 1478 if (ie1 && ie2) { 1479 int mesh_id_cmp; 1480 1481 if (ie1[1] == ie2[1]) 1482 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); 1483 else 1484 mesh_id_cmp = ie2[1] - ie1[1]; 1485 1486 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 1487 a_ies->data, a_ies->len); 1488 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 1489 b_ies->data, b_ies->len); 1490 if (ie1 && ie2) { 1491 if (mesh_id_cmp) 1492 return mesh_id_cmp; 1493 if (ie1[1] != ie2[1]) 1494 return ie2[1] - ie1[1]; 1495 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 1496 } 1497 } 1498 1499 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); 1500 if (r) 1501 return r; 1502 1503 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); 1504 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); 1505 1506 if (!ie1 && !ie2) 1507 return 0; 1508 1509 /* 1510 * Note that with "hide_ssid", the function returns a match if 1511 * the already-present BSS ("b") is a hidden SSID beacon for 1512 * the new BSS ("a"). 1513 */ 1514 1515 /* sort missing IE before (left of) present IE */ 1516 if (!ie1) 1517 return -1; 1518 if (!ie2) 1519 return 1; 1520 1521 switch (mode) { 1522 case BSS_CMP_HIDE_ZLEN: 1523 /* 1524 * In ZLEN mode we assume the BSS entry we're 1525 * looking for has a zero-length SSID. So if 1526 * the one we're looking at right now has that, 1527 * return 0. Otherwise, return the difference 1528 * in length, but since we're looking for the 1529 * 0-length it's really equivalent to returning 1530 * the length of the one we're looking at. 1531 * 1532 * No content comparison is needed as we assume 1533 * the content length is zero. 1534 */ 1535 return ie2[1]; 1536 case BSS_CMP_REGULAR: 1537 default: 1538 /* sort by length first, then by contents */ 1539 if (ie1[1] != ie2[1]) 1540 return ie2[1] - ie1[1]; 1541 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 1542 case BSS_CMP_HIDE_NUL: 1543 if (ie1[1] != ie2[1]) 1544 return ie2[1] - ie1[1]; 1545 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ 1546 for (i = 0; i < ie2[1]; i++) 1547 if (ie2[i + 2]) 1548 return -1; 1549 return 0; 1550 } 1551 } 1552 1553 static bool cfg80211_bss_type_match(u16 capability, 1554 enum nl80211_band band, 1555 enum ieee80211_bss_type bss_type) 1556 { 1557 bool ret = true; 1558 u16 mask, val; 1559 1560 if (bss_type == IEEE80211_BSS_TYPE_ANY) 1561 return ret; 1562 1563 if (band == NL80211_BAND_60GHZ) { 1564 mask = WLAN_CAPABILITY_DMG_TYPE_MASK; 1565 switch (bss_type) { 1566 case IEEE80211_BSS_TYPE_ESS: 1567 val = WLAN_CAPABILITY_DMG_TYPE_AP; 1568 break; 1569 case IEEE80211_BSS_TYPE_PBSS: 1570 val = WLAN_CAPABILITY_DMG_TYPE_PBSS; 1571 break; 1572 case IEEE80211_BSS_TYPE_IBSS: 1573 val = WLAN_CAPABILITY_DMG_TYPE_IBSS; 1574 break; 1575 default: 1576 return false; 1577 } 1578 } else { 1579 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; 1580 switch (bss_type) { 1581 case IEEE80211_BSS_TYPE_ESS: 1582 val = WLAN_CAPABILITY_ESS; 1583 break; 1584 case IEEE80211_BSS_TYPE_IBSS: 1585 val = WLAN_CAPABILITY_IBSS; 1586 break; 1587 case IEEE80211_BSS_TYPE_MBSS: 1588 val = 0; 1589 break; 1590 default: 1591 return false; 1592 } 1593 } 1594 1595 ret = ((capability & mask) == val); 1596 return ret; 1597 } 1598 1599 /* Returned bss is reference counted and must be cleaned up appropriately. */ 1600 struct cfg80211_bss *__cfg80211_get_bss(struct wiphy *wiphy, 1601 struct ieee80211_channel *channel, 1602 const u8 *bssid, 1603 const u8 *ssid, size_t ssid_len, 1604 enum ieee80211_bss_type bss_type, 1605 enum ieee80211_privacy privacy, 1606 u32 use_for) 1607 { 1608 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1609 struct cfg80211_internal_bss *bss, *res = NULL; 1610 unsigned long now = jiffies; 1611 int bss_privacy; 1612 1613 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, 1614 privacy); 1615 1616 spin_lock_bh(&rdev->bss_lock); 1617 1618 list_for_each_entry(bss, &rdev->bss_list, list) { 1619 if (!cfg80211_bss_type_match(bss->pub.capability, 1620 bss->pub.channel->band, bss_type)) 1621 continue; 1622 1623 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); 1624 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || 1625 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) 1626 continue; 1627 if (channel && bss->pub.channel != channel) 1628 continue; 1629 if (!is_valid_ether_addr(bss->pub.bssid)) 1630 continue; 1631 if ((bss->pub.use_for & use_for) != use_for) 1632 continue; 1633 /* Don't get expired BSS structs */ 1634 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 1635 !atomic_read(&bss->hold)) 1636 continue; 1637 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 1638 res = bss; 1639 bss_ref_get(rdev, res); 1640 break; 1641 } 1642 } 1643 1644 spin_unlock_bh(&rdev->bss_lock); 1645 if (!res) 1646 return NULL; 1647 trace_cfg80211_return_bss(&res->pub); 1648 return &res->pub; 1649 } 1650 EXPORT_SYMBOL(__cfg80211_get_bss); 1651 1652 static bool rb_insert_bss(struct cfg80211_registered_device *rdev, 1653 struct cfg80211_internal_bss *bss) 1654 { 1655 struct rb_node **p = &rdev->bss_tree.rb_node; 1656 struct rb_node *parent = NULL; 1657 struct cfg80211_internal_bss *tbss; 1658 int cmp; 1659 1660 while (*p) { 1661 parent = *p; 1662 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 1663 1664 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); 1665 1666 if (WARN_ON(!cmp)) { 1667 /* will sort of leak this BSS */ 1668 return false; 1669 } 1670 1671 if (cmp < 0) 1672 p = &(*p)->rb_left; 1673 else 1674 p = &(*p)->rb_right; 1675 } 1676 1677 rb_link_node(&bss->rbn, parent, p); 1678 rb_insert_color(&bss->rbn, &rdev->bss_tree); 1679 return true; 1680 } 1681 1682 static struct cfg80211_internal_bss * 1683 rb_find_bss(struct cfg80211_registered_device *rdev, 1684 struct cfg80211_internal_bss *res, 1685 enum bss_compare_mode mode) 1686 { 1687 struct rb_node *n = rdev->bss_tree.rb_node; 1688 struct cfg80211_internal_bss *bss; 1689 int r; 1690 1691 while (n) { 1692 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 1693 r = cmp_bss(&res->pub, &bss->pub, mode); 1694 1695 if (r == 0) 1696 return bss; 1697 else if (r < 0) 1698 n = n->rb_left; 1699 else 1700 n = n->rb_right; 1701 } 1702 1703 return NULL; 1704 } 1705 1706 static void cfg80211_insert_bss(struct cfg80211_registered_device *rdev, 1707 struct cfg80211_internal_bss *bss) 1708 { 1709 lockdep_assert_held(&rdev->bss_lock); 1710 1711 if (!rb_insert_bss(rdev, bss)) 1712 return; 1713 list_add_tail(&bss->list, &rdev->bss_list); 1714 rdev->bss_entries++; 1715 } 1716 1717 static void cfg80211_rehash_bss(struct cfg80211_registered_device *rdev, 1718 struct cfg80211_internal_bss *bss) 1719 { 1720 lockdep_assert_held(&rdev->bss_lock); 1721 1722 rb_erase(&bss->rbn, &rdev->bss_tree); 1723 if (!rb_insert_bss(rdev, bss)) { 1724 list_del(&bss->list); 1725 if (!list_empty(&bss->hidden_list)) 1726 list_del_init(&bss->hidden_list); 1727 if (!list_empty(&bss->pub.nontrans_list)) 1728 list_del_init(&bss->pub.nontrans_list); 1729 rdev->bss_entries--; 1730 } 1731 rdev->bss_generation++; 1732 } 1733 1734 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, 1735 struct cfg80211_internal_bss *new) 1736 { 1737 const struct cfg80211_bss_ies *ies; 1738 struct cfg80211_internal_bss *bss; 1739 const u8 *ie; 1740 int i, ssidlen; 1741 u8 fold = 0; 1742 u32 n_entries = 0; 1743 1744 ies = rcu_access_pointer(new->pub.beacon_ies); 1745 if (WARN_ON(!ies)) 1746 return false; 1747 1748 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 1749 if (!ie) { 1750 /* nothing to do */ 1751 return true; 1752 } 1753 1754 ssidlen = ie[1]; 1755 for (i = 0; i < ssidlen; i++) 1756 fold |= ie[2 + i]; 1757 1758 if (fold) { 1759 /* not a hidden SSID */ 1760 return true; 1761 } 1762 1763 /* This is the bad part ... */ 1764 1765 list_for_each_entry(bss, &rdev->bss_list, list) { 1766 /* 1767 * we're iterating all the entries anyway, so take the 1768 * opportunity to validate the list length accounting 1769 */ 1770 n_entries++; 1771 1772 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) 1773 continue; 1774 if (bss->pub.channel != new->pub.channel) 1775 continue; 1776 if (rcu_access_pointer(bss->pub.beacon_ies)) 1777 continue; 1778 ies = rcu_access_pointer(bss->pub.ies); 1779 if (!ies) 1780 continue; 1781 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 1782 if (!ie) 1783 continue; 1784 if (ssidlen && ie[1] != ssidlen) 1785 continue; 1786 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) 1787 continue; 1788 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) 1789 list_del(&bss->hidden_list); 1790 /* combine them */ 1791 list_add(&bss->hidden_list, &new->hidden_list); 1792 bss->pub.hidden_beacon_bss = &new->pub; 1793 new->refcount += bss->refcount; 1794 rcu_assign_pointer(bss->pub.beacon_ies, 1795 new->pub.beacon_ies); 1796 } 1797 1798 WARN_ONCE(n_entries != rdev->bss_entries, 1799 "rdev bss entries[%d]/list[len:%d] corruption\n", 1800 rdev->bss_entries, n_entries); 1801 1802 return true; 1803 } 1804 1805 static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known, 1806 const struct cfg80211_bss_ies *new_ies, 1807 const struct cfg80211_bss_ies *old_ies) 1808 { 1809 struct cfg80211_internal_bss *bss; 1810 1811 /* Assign beacon IEs to all sub entries */ 1812 list_for_each_entry(bss, &known->hidden_list, hidden_list) { 1813 const struct cfg80211_bss_ies *ies; 1814 1815 ies = rcu_access_pointer(bss->pub.beacon_ies); 1816 WARN_ON(ies != old_ies); 1817 1818 rcu_assign_pointer(bss->pub.beacon_ies, new_ies); 1819 } 1820 } 1821 1822 static void cfg80211_check_stuck_ecsa(struct cfg80211_registered_device *rdev, 1823 struct cfg80211_internal_bss *known, 1824 const struct cfg80211_bss_ies *old) 1825 { 1826 const struct ieee80211_ext_chansw_ie *ecsa; 1827 const struct element *elem_new, *elem_old; 1828 const struct cfg80211_bss_ies *new, *bcn; 1829 1830 if (known->pub.proberesp_ecsa_stuck) 1831 return; 1832 1833 new = rcu_dereference_protected(known->pub.proberesp_ies, 1834 lockdep_is_held(&rdev->bss_lock)); 1835 if (WARN_ON(!new)) 1836 return; 1837 1838 if (new->tsf - old->tsf < USEC_PER_SEC) 1839 return; 1840 1841 elem_old = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN, 1842 old->data, old->len); 1843 if (!elem_old) 1844 return; 1845 1846 elem_new = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN, 1847 new->data, new->len); 1848 if (!elem_new) 1849 return; 1850 1851 bcn = rcu_dereference_protected(known->pub.beacon_ies, 1852 lockdep_is_held(&rdev->bss_lock)); 1853 if (bcn && 1854 cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN, 1855 bcn->data, bcn->len)) 1856 return; 1857 1858 if (elem_new->datalen != elem_old->datalen) 1859 return; 1860 if (elem_new->datalen < sizeof(struct ieee80211_ext_chansw_ie)) 1861 return; 1862 if (memcmp(elem_new->data, elem_old->data, elem_new->datalen)) 1863 return; 1864 1865 ecsa = (void *)elem_new->data; 1866 1867 if (!ecsa->mode) 1868 return; 1869 1870 if (ecsa->new_ch_num != 1871 ieee80211_frequency_to_channel(known->pub.channel->center_freq)) 1872 return; 1873 1874 known->pub.proberesp_ecsa_stuck = 1; 1875 } 1876 1877 static bool 1878 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev, 1879 struct cfg80211_internal_bss *known, 1880 struct cfg80211_internal_bss *new, 1881 bool signal_valid) 1882 { 1883 lockdep_assert_held(&rdev->bss_lock); 1884 1885 /* Update IEs */ 1886 if (rcu_access_pointer(new->pub.proberesp_ies)) { 1887 const struct cfg80211_bss_ies *old; 1888 1889 old = rcu_access_pointer(known->pub.proberesp_ies); 1890 1891 rcu_assign_pointer(known->pub.proberesp_ies, 1892 new->pub.proberesp_ies); 1893 /* Override possible earlier Beacon frame IEs */ 1894 rcu_assign_pointer(known->pub.ies, 1895 new->pub.proberesp_ies); 1896 if (old) { 1897 cfg80211_check_stuck_ecsa(rdev, known, old); 1898 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); 1899 } 1900 } 1901 1902 if (rcu_access_pointer(new->pub.beacon_ies)) { 1903 const struct cfg80211_bss_ies *old; 1904 1905 if (known->pub.hidden_beacon_bss && 1906 !list_empty(&known->hidden_list)) { 1907 const struct cfg80211_bss_ies *f; 1908 1909 /* The known BSS struct is one of the probe 1910 * response members of a group, but we're 1911 * receiving a beacon (beacon_ies in the new 1912 * bss is used). This can only mean that the 1913 * AP changed its beacon from not having an 1914 * SSID to showing it, which is confusing so 1915 * drop this information. 1916 */ 1917 1918 f = rcu_access_pointer(new->pub.beacon_ies); 1919 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head); 1920 return false; 1921 } 1922 1923 old = rcu_access_pointer(known->pub.beacon_ies); 1924 1925 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies); 1926 1927 /* Override IEs if they were from a beacon before */ 1928 if (old == rcu_access_pointer(known->pub.ies)) 1929 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies); 1930 1931 cfg80211_update_hidden_bsses(known, 1932 rcu_access_pointer(new->pub.beacon_ies), 1933 old); 1934 1935 if (old) 1936 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); 1937 } 1938 1939 known->pub.beacon_interval = new->pub.beacon_interval; 1940 1941 /* don't update the signal if beacon was heard on 1942 * adjacent channel. 1943 */ 1944 if (signal_valid) 1945 known->pub.signal = new->pub.signal; 1946 known->pub.capability = new->pub.capability; 1947 known->ts = new->ts; 1948 known->pub.ts_boottime = new->pub.ts_boottime; 1949 known->parent_tsf = new->parent_tsf; 1950 known->pub.chains = new->pub.chains; 1951 memcpy(known->pub.chain_signal, new->pub.chain_signal, 1952 IEEE80211_MAX_CHAINS); 1953 ether_addr_copy(known->parent_bssid, new->parent_bssid); 1954 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator; 1955 known->pub.bssid_index = new->pub.bssid_index; 1956 known->pub.use_for &= new->pub.use_for; 1957 known->pub.cannot_use_reasons = new->pub.cannot_use_reasons; 1958 known->bss_source = new->bss_source; 1959 1960 return true; 1961 } 1962 1963 /* Returned bss is reference counted and must be cleaned up appropriately. */ 1964 static struct cfg80211_internal_bss * 1965 __cfg80211_bss_update(struct cfg80211_registered_device *rdev, 1966 struct cfg80211_internal_bss *tmp, 1967 bool signal_valid, unsigned long ts) 1968 { 1969 struct cfg80211_internal_bss *found = NULL; 1970 struct cfg80211_bss_ies *ies; 1971 1972 if (WARN_ON(!tmp->pub.channel)) 1973 goto free_ies; 1974 1975 tmp->ts = ts; 1976 1977 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) 1978 goto free_ies; 1979 1980 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); 1981 1982 if (found) { 1983 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid)) 1984 return NULL; 1985 } else { 1986 struct cfg80211_internal_bss *new; 1987 struct cfg80211_internal_bss *hidden; 1988 1989 /* 1990 * create a copy -- the "res" variable that is passed in 1991 * is allocated on the stack since it's not needed in the 1992 * more common case of an update 1993 */ 1994 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, 1995 GFP_ATOMIC); 1996 if (!new) 1997 goto free_ies; 1998 memcpy(new, tmp, sizeof(*new)); 1999 new->refcount = 1; 2000 INIT_LIST_HEAD(&new->hidden_list); 2001 INIT_LIST_HEAD(&new->pub.nontrans_list); 2002 /* we'll set this later if it was non-NULL */ 2003 new->pub.transmitted_bss = NULL; 2004 2005 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 2006 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); 2007 if (!hidden) 2008 hidden = rb_find_bss(rdev, tmp, 2009 BSS_CMP_HIDE_NUL); 2010 if (hidden) { 2011 new->pub.hidden_beacon_bss = &hidden->pub; 2012 list_add(&new->hidden_list, 2013 &hidden->hidden_list); 2014 hidden->refcount++; 2015 2016 ies = (void *)rcu_access_pointer(new->pub.beacon_ies); 2017 rcu_assign_pointer(new->pub.beacon_ies, 2018 hidden->pub.beacon_ies); 2019 if (ies) 2020 kfree_rcu(ies, rcu_head); 2021 } 2022 } else { 2023 /* 2024 * Ok so we found a beacon, and don't have an entry. If 2025 * it's a beacon with hidden SSID, we might be in for an 2026 * expensive search for any probe responses that should 2027 * be grouped with this beacon for updates ... 2028 */ 2029 if (!cfg80211_combine_bsses(rdev, new)) { 2030 bss_ref_put(rdev, new); 2031 return NULL; 2032 } 2033 } 2034 2035 if (rdev->bss_entries >= bss_entries_limit && 2036 !cfg80211_bss_expire_oldest(rdev)) { 2037 bss_ref_put(rdev, new); 2038 return NULL; 2039 } 2040 2041 /* This must be before the call to bss_ref_get */ 2042 if (tmp->pub.transmitted_bss) { 2043 new->pub.transmitted_bss = tmp->pub.transmitted_bss; 2044 bss_ref_get(rdev, bss_from_pub(tmp->pub.transmitted_bss)); 2045 } 2046 2047 cfg80211_insert_bss(rdev, new); 2048 found = new; 2049 } 2050 2051 rdev->bss_generation++; 2052 bss_ref_get(rdev, found); 2053 2054 return found; 2055 2056 free_ies: 2057 ies = (void *)rcu_access_pointer(tmp->pub.beacon_ies); 2058 if (ies) 2059 kfree_rcu(ies, rcu_head); 2060 ies = (void *)rcu_access_pointer(tmp->pub.proberesp_ies); 2061 if (ies) 2062 kfree_rcu(ies, rcu_head); 2063 2064 return NULL; 2065 } 2066 2067 struct cfg80211_internal_bss * 2068 cfg80211_bss_update(struct cfg80211_registered_device *rdev, 2069 struct cfg80211_internal_bss *tmp, 2070 bool signal_valid, unsigned long ts) 2071 { 2072 struct cfg80211_internal_bss *res; 2073 2074 spin_lock_bh(&rdev->bss_lock); 2075 res = __cfg80211_bss_update(rdev, tmp, signal_valid, ts); 2076 spin_unlock_bh(&rdev->bss_lock); 2077 2078 return res; 2079 } 2080 2081 int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen, 2082 enum nl80211_band band) 2083 { 2084 const struct element *tmp; 2085 2086 if (band == NL80211_BAND_6GHZ) { 2087 struct ieee80211_he_operation *he_oper; 2088 2089 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, 2090 ielen); 2091 if (tmp && tmp->datalen >= sizeof(*he_oper) && 2092 tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) { 2093 const struct ieee80211_he_6ghz_oper *he_6ghz_oper; 2094 2095 he_oper = (void *)&tmp->data[1]; 2096 2097 he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper); 2098 if (!he_6ghz_oper) 2099 return -1; 2100 2101 return he_6ghz_oper->primary; 2102 } 2103 } else if (band == NL80211_BAND_S1GHZ) { 2104 tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen); 2105 if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) { 2106 struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data; 2107 2108 return s1gop->oper_ch; 2109 } 2110 } else { 2111 tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen); 2112 if (tmp && tmp->datalen == 1) 2113 return tmp->data[0]; 2114 2115 tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen); 2116 if (tmp && 2117 tmp->datalen >= sizeof(struct ieee80211_ht_operation)) { 2118 struct ieee80211_ht_operation *htop = (void *)tmp->data; 2119 2120 return htop->primary_chan; 2121 } 2122 } 2123 2124 return -1; 2125 } 2126 EXPORT_SYMBOL(cfg80211_get_ies_channel_number); 2127 2128 /* 2129 * Update RX channel information based on the available frame payload 2130 * information. This is mainly for the 2.4 GHz band where frames can be received 2131 * from neighboring channels and the Beacon frames use the DSSS Parameter Set 2132 * element to indicate the current (transmitting) channel, but this might also 2133 * be needed on other bands if RX frequency does not match with the actual 2134 * operating channel of a BSS, or if the AP reports a different primary channel. 2135 */ 2136 static struct ieee80211_channel * 2137 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, 2138 struct ieee80211_channel *channel) 2139 { 2140 u32 freq; 2141 int channel_number; 2142 struct ieee80211_channel *alt_channel; 2143 2144 channel_number = cfg80211_get_ies_channel_number(ie, ielen, 2145 channel->band); 2146 2147 if (channel_number < 0) { 2148 /* No channel information in frame payload */ 2149 return channel; 2150 } 2151 2152 freq = ieee80211_channel_to_freq_khz(channel_number, channel->band); 2153 2154 /* 2155 * Frame info (beacon/prob res) is the same as received channel, 2156 * no need for further processing. 2157 */ 2158 if (freq == ieee80211_channel_to_khz(channel)) 2159 return channel; 2160 2161 alt_channel = ieee80211_get_channel_khz(wiphy, freq); 2162 if (!alt_channel) { 2163 if (channel->band == NL80211_BAND_2GHZ || 2164 channel->band == NL80211_BAND_6GHZ) { 2165 /* 2166 * Better not allow unexpected channels when that could 2167 * be going beyond the 1-11 range (e.g., discovering 2168 * BSS on channel 12 when radio is configured for 2169 * channel 11) or beyond the 6 GHz channel range. 2170 */ 2171 return NULL; 2172 } 2173 2174 /* No match for the payload channel number - ignore it */ 2175 return channel; 2176 } 2177 2178 /* 2179 * Use the channel determined through the payload channel number 2180 * instead of the RX channel reported by the driver. 2181 */ 2182 if (alt_channel->flags & IEEE80211_CHAN_DISABLED) 2183 return NULL; 2184 return alt_channel; 2185 } 2186 2187 struct cfg80211_inform_single_bss_data { 2188 struct cfg80211_inform_bss *drv_data; 2189 enum cfg80211_bss_frame_type ftype; 2190 struct ieee80211_channel *channel; 2191 u8 bssid[ETH_ALEN]; 2192 u64 tsf; 2193 u16 capability; 2194 u16 beacon_interval; 2195 const u8 *ie; 2196 size_t ielen; 2197 2198 enum bss_source_type bss_source; 2199 /* Set if reporting bss_source != BSS_SOURCE_DIRECT */ 2200 struct cfg80211_bss *source_bss; 2201 u8 max_bssid_indicator; 2202 u8 bssid_index; 2203 2204 u8 use_for; 2205 u64 cannot_use_reasons; 2206 }; 2207 2208 enum ieee80211_ap_reg_power 2209 cfg80211_get_6ghz_power_type(const u8 *elems, size_t elems_len) 2210 { 2211 const struct ieee80211_he_6ghz_oper *he_6ghz_oper; 2212 struct ieee80211_he_operation *he_oper; 2213 const struct element *tmp; 2214 2215 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, 2216 elems, elems_len); 2217 if (!tmp || tmp->datalen < sizeof(*he_oper) + 1 || 2218 tmp->datalen < ieee80211_he_oper_size(tmp->data + 1)) 2219 return IEEE80211_REG_UNSET_AP; 2220 2221 he_oper = (void *)&tmp->data[1]; 2222 he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper); 2223 2224 if (!he_6ghz_oper) 2225 return IEEE80211_REG_UNSET_AP; 2226 2227 switch (u8_get_bits(he_6ghz_oper->control, 2228 IEEE80211_HE_6GHZ_OPER_CTRL_REG_INFO)) { 2229 case IEEE80211_6GHZ_CTRL_REG_LPI_AP: 2230 case IEEE80211_6GHZ_CTRL_REG_INDOOR_LPI_AP: 2231 return IEEE80211_REG_LPI_AP; 2232 case IEEE80211_6GHZ_CTRL_REG_SP_AP: 2233 case IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP: 2234 case IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP_OLD: 2235 return IEEE80211_REG_SP_AP; 2236 case IEEE80211_6GHZ_CTRL_REG_VLP_AP: 2237 return IEEE80211_REG_VLP_AP; 2238 default: 2239 return IEEE80211_REG_UNSET_AP; 2240 } 2241 } 2242 2243 static bool cfg80211_6ghz_power_type_valid(const u8 *elems, size_t elems_len, 2244 const u32 flags) 2245 { 2246 switch (cfg80211_get_6ghz_power_type(elems, elems_len)) { 2247 case IEEE80211_REG_LPI_AP: 2248 return true; 2249 case IEEE80211_REG_SP_AP: 2250 return !(flags & IEEE80211_CHAN_NO_6GHZ_AFC_CLIENT); 2251 case IEEE80211_REG_VLP_AP: 2252 return !(flags & IEEE80211_CHAN_NO_6GHZ_VLP_CLIENT); 2253 default: 2254 return false; 2255 } 2256 } 2257 2258 /* Returned bss is reference counted and must be cleaned up appropriately. */ 2259 static struct cfg80211_bss * 2260 cfg80211_inform_single_bss_data(struct wiphy *wiphy, 2261 struct cfg80211_inform_single_bss_data *data, 2262 gfp_t gfp) 2263 { 2264 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 2265 struct cfg80211_inform_bss *drv_data = data->drv_data; 2266 struct cfg80211_bss_ies *ies; 2267 struct ieee80211_channel *channel; 2268 struct cfg80211_internal_bss tmp = {}, *res; 2269 int bss_type; 2270 bool signal_valid; 2271 unsigned long ts; 2272 2273 if (WARN_ON(!wiphy)) 2274 return NULL; 2275 2276 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 2277 (drv_data->signal < 0 || drv_data->signal > 100))) 2278 return NULL; 2279 2280 if (WARN_ON(data->bss_source != BSS_SOURCE_DIRECT && !data->source_bss)) 2281 return NULL; 2282 2283 channel = data->channel; 2284 if (!channel) 2285 channel = cfg80211_get_bss_channel(wiphy, data->ie, data->ielen, 2286 drv_data->chan); 2287 if (!channel) 2288 return NULL; 2289 2290 if (channel->band == NL80211_BAND_6GHZ && 2291 !cfg80211_6ghz_power_type_valid(data->ie, data->ielen, 2292 channel->flags)) { 2293 data->use_for = 0; 2294 data->cannot_use_reasons = 2295 NL80211_BSS_CANNOT_USE_6GHZ_PWR_MISMATCH; 2296 } 2297 2298 memcpy(tmp.pub.bssid, data->bssid, ETH_ALEN); 2299 tmp.pub.channel = channel; 2300 if (data->bss_source != BSS_SOURCE_STA_PROFILE) 2301 tmp.pub.signal = drv_data->signal; 2302 else 2303 tmp.pub.signal = 0; 2304 tmp.pub.beacon_interval = data->beacon_interval; 2305 tmp.pub.capability = data->capability; 2306 tmp.pub.ts_boottime = drv_data->boottime_ns; 2307 tmp.parent_tsf = drv_data->parent_tsf; 2308 ether_addr_copy(tmp.parent_bssid, drv_data->parent_bssid); 2309 tmp.pub.chains = drv_data->chains; 2310 memcpy(tmp.pub.chain_signal, drv_data->chain_signal, 2311 IEEE80211_MAX_CHAINS); 2312 tmp.pub.use_for = data->use_for; 2313 tmp.pub.cannot_use_reasons = data->cannot_use_reasons; 2314 tmp.bss_source = data->bss_source; 2315 2316 switch (data->bss_source) { 2317 case BSS_SOURCE_MBSSID: 2318 tmp.pub.transmitted_bss = data->source_bss; 2319 fallthrough; 2320 case BSS_SOURCE_STA_PROFILE: 2321 ts = bss_from_pub(data->source_bss)->ts; 2322 tmp.pub.bssid_index = data->bssid_index; 2323 tmp.pub.max_bssid_indicator = data->max_bssid_indicator; 2324 break; 2325 case BSS_SOURCE_DIRECT: 2326 ts = jiffies; 2327 2328 if (channel->band == NL80211_BAND_60GHZ) { 2329 bss_type = data->capability & 2330 WLAN_CAPABILITY_DMG_TYPE_MASK; 2331 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || 2332 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) 2333 regulatory_hint_found_beacon(wiphy, channel, 2334 gfp); 2335 } else { 2336 if (data->capability & WLAN_CAPABILITY_ESS) 2337 regulatory_hint_found_beacon(wiphy, channel, 2338 gfp); 2339 } 2340 break; 2341 } 2342 2343 /* 2344 * If we do not know here whether the IEs are from a Beacon or Probe 2345 * Response frame, we need to pick one of the options and only use it 2346 * with the driver that does not provide the full Beacon/Probe Response 2347 * frame. Use Beacon frame pointer to avoid indicating that this should 2348 * override the IEs pointer should we have received an earlier 2349 * indication of Probe Response data. 2350 */ 2351 ies = kzalloc(sizeof(*ies) + data->ielen, gfp); 2352 if (!ies) 2353 return NULL; 2354 ies->len = data->ielen; 2355 ies->tsf = data->tsf; 2356 ies->from_beacon = false; 2357 memcpy(ies->data, data->ie, data->ielen); 2358 2359 switch (data->ftype) { 2360 case CFG80211_BSS_FTYPE_BEACON: 2361 case CFG80211_BSS_FTYPE_S1G_BEACON: 2362 ies->from_beacon = true; 2363 fallthrough; 2364 case CFG80211_BSS_FTYPE_UNKNOWN: 2365 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 2366 break; 2367 case CFG80211_BSS_FTYPE_PRESP: 2368 rcu_assign_pointer(tmp.pub.proberesp_ies, ies); 2369 break; 2370 } 2371 rcu_assign_pointer(tmp.pub.ies, ies); 2372 2373 signal_valid = drv_data->chan == channel; 2374 spin_lock_bh(&rdev->bss_lock); 2375 res = __cfg80211_bss_update(rdev, &tmp, signal_valid, ts); 2376 if (!res) 2377 goto drop; 2378 2379 rdev_inform_bss(rdev, &res->pub, ies, drv_data->drv_data); 2380 2381 if (data->bss_source == BSS_SOURCE_MBSSID) { 2382 /* this is a nontransmitting bss, we need to add it to 2383 * transmitting bss' list if it is not there 2384 */ 2385 if (cfg80211_add_nontrans_list(data->source_bss, &res->pub)) { 2386 if (__cfg80211_unlink_bss(rdev, res)) { 2387 rdev->bss_generation++; 2388 res = NULL; 2389 } 2390 } 2391 2392 if (!res) 2393 goto drop; 2394 } 2395 spin_unlock_bh(&rdev->bss_lock); 2396 2397 trace_cfg80211_return_bss(&res->pub); 2398 /* __cfg80211_bss_update gives us a referenced result */ 2399 return &res->pub; 2400 2401 drop: 2402 spin_unlock_bh(&rdev->bss_lock); 2403 return NULL; 2404 } 2405 2406 static const struct element 2407 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen, 2408 const struct element *mbssid_elem, 2409 const struct element *sub_elem) 2410 { 2411 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen; 2412 const struct element *next_mbssid; 2413 const struct element *next_sub; 2414 2415 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, 2416 mbssid_end, 2417 ielen - (mbssid_end - ie)); 2418 2419 /* 2420 * If it is not the last subelement in current MBSSID IE or there isn't 2421 * a next MBSSID IE - profile is complete. 2422 */ 2423 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) || 2424 !next_mbssid) 2425 return NULL; 2426 2427 /* For any length error, just return NULL */ 2428 2429 if (next_mbssid->datalen < 4) 2430 return NULL; 2431 2432 next_sub = (void *)&next_mbssid->data[1]; 2433 2434 if (next_mbssid->data + next_mbssid->datalen < 2435 next_sub->data + next_sub->datalen) 2436 return NULL; 2437 2438 if (next_sub->id != 0 || next_sub->datalen < 2) 2439 return NULL; 2440 2441 /* 2442 * Check if the first element in the next sub element is a start 2443 * of a new profile 2444 */ 2445 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ? 2446 NULL : next_mbssid; 2447 } 2448 2449 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen, 2450 const struct element *mbssid_elem, 2451 const struct element *sub_elem, 2452 u8 *merged_ie, size_t max_copy_len) 2453 { 2454 size_t copied_len = sub_elem->datalen; 2455 const struct element *next_mbssid; 2456 2457 if (sub_elem->datalen > max_copy_len) 2458 return 0; 2459 2460 memcpy(merged_ie, sub_elem->data, sub_elem->datalen); 2461 2462 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen, 2463 mbssid_elem, 2464 sub_elem))) { 2465 const struct element *next_sub = (void *)&next_mbssid->data[1]; 2466 2467 if (copied_len + next_sub->datalen > max_copy_len) 2468 break; 2469 memcpy(merged_ie + copied_len, next_sub->data, 2470 next_sub->datalen); 2471 copied_len += next_sub->datalen; 2472 } 2473 2474 return copied_len; 2475 } 2476 EXPORT_SYMBOL(cfg80211_merge_profile); 2477 2478 static void 2479 cfg80211_parse_mbssid_data(struct wiphy *wiphy, 2480 struct cfg80211_inform_single_bss_data *tx_data, 2481 struct cfg80211_bss *source_bss, 2482 gfp_t gfp) 2483 { 2484 struct cfg80211_inform_single_bss_data data = { 2485 .drv_data = tx_data->drv_data, 2486 .ftype = tx_data->ftype, 2487 .tsf = tx_data->tsf, 2488 .beacon_interval = tx_data->beacon_interval, 2489 .source_bss = source_bss, 2490 .bss_source = BSS_SOURCE_MBSSID, 2491 .use_for = tx_data->use_for, 2492 .cannot_use_reasons = tx_data->cannot_use_reasons, 2493 }; 2494 const u8 *mbssid_index_ie; 2495 const struct element *elem, *sub; 2496 u8 *new_ie, *profile; 2497 u64 seen_indices = 0; 2498 struct cfg80211_bss *bss; 2499 2500 if (!source_bss) 2501 return; 2502 if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, 2503 tx_data->ie, tx_data->ielen)) 2504 return; 2505 if (!wiphy->support_mbssid) 2506 return; 2507 if (wiphy->support_only_he_mbssid && 2508 !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, 2509 tx_data->ie, tx_data->ielen)) 2510 return; 2511 2512 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); 2513 if (!new_ie) 2514 return; 2515 2516 profile = kmalloc(tx_data->ielen, gfp); 2517 if (!profile) 2518 goto out; 2519 2520 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, 2521 tx_data->ie, tx_data->ielen) { 2522 if (elem->datalen < 4) 2523 continue; 2524 if (elem->data[0] < 1 || (int)elem->data[0] > 8) 2525 continue; 2526 for_each_element(sub, elem->data + 1, elem->datalen - 1) { 2527 u8 profile_len; 2528 2529 if (sub->id != 0 || sub->datalen < 4) { 2530 /* not a valid BSS profile */ 2531 continue; 2532 } 2533 2534 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || 2535 sub->data[1] != 2) { 2536 /* The first element within the Nontransmitted 2537 * BSSID Profile is not the Nontransmitted 2538 * BSSID Capability element. 2539 */ 2540 continue; 2541 } 2542 2543 memset(profile, 0, tx_data->ielen); 2544 profile_len = cfg80211_merge_profile(tx_data->ie, 2545 tx_data->ielen, 2546 elem, 2547 sub, 2548 profile, 2549 tx_data->ielen); 2550 2551 /* found a Nontransmitted BSSID Profile */ 2552 mbssid_index_ie = cfg80211_find_ie 2553 (WLAN_EID_MULTI_BSSID_IDX, 2554 profile, profile_len); 2555 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 || 2556 mbssid_index_ie[2] == 0 || 2557 mbssid_index_ie[2] > 46 || 2558 mbssid_index_ie[2] >= (1 << elem->data[0])) { 2559 /* No valid Multiple BSSID-Index element */ 2560 continue; 2561 } 2562 2563 if (seen_indices & BIT_ULL(mbssid_index_ie[2])) 2564 /* We don't support legacy split of a profile */ 2565 net_dbg_ratelimited("Partial info for BSSID index %d\n", 2566 mbssid_index_ie[2]); 2567 2568 seen_indices |= BIT_ULL(mbssid_index_ie[2]); 2569 2570 data.bssid_index = mbssid_index_ie[2]; 2571 data.max_bssid_indicator = elem->data[0]; 2572 2573 cfg80211_gen_new_bssid(tx_data->bssid, 2574 data.max_bssid_indicator, 2575 data.bssid_index, 2576 data.bssid); 2577 2578 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); 2579 data.ie = new_ie; 2580 data.ielen = cfg80211_gen_new_ie(tx_data->ie, 2581 tx_data->ielen, 2582 profile, 2583 profile_len, 2584 new_ie, 2585 IEEE80211_MAX_DATA_LEN); 2586 if (!data.ielen) 2587 continue; 2588 2589 data.capability = get_unaligned_le16(profile + 2); 2590 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp); 2591 if (!bss) 2592 break; 2593 cfg80211_put_bss(wiphy, bss); 2594 } 2595 } 2596 2597 out: 2598 kfree(new_ie); 2599 kfree(profile); 2600 } 2601 2602 ssize_t cfg80211_defragment_element(const struct element *elem, const u8 *ies, 2603 size_t ieslen, u8 *data, size_t data_len, 2604 u8 frag_id) 2605 { 2606 const struct element *next; 2607 ssize_t copied; 2608 u8 elem_datalen; 2609 2610 if (!elem) 2611 return -EINVAL; 2612 2613 /* elem might be invalid after the memmove */ 2614 next = (void *)(elem->data + elem->datalen); 2615 elem_datalen = elem->datalen; 2616 2617 if (elem->id == WLAN_EID_EXTENSION) { 2618 copied = elem->datalen - 1; 2619 2620 if (data) { 2621 if (copied > data_len) 2622 return -ENOSPC; 2623 2624 memmove(data, elem->data + 1, copied); 2625 } 2626 } else { 2627 copied = elem->datalen; 2628 2629 if (data) { 2630 if (copied > data_len) 2631 return -ENOSPC; 2632 2633 memmove(data, elem->data, copied); 2634 } 2635 } 2636 2637 /* Fragmented elements must have 255 bytes */ 2638 if (elem_datalen < 255) 2639 return copied; 2640 2641 for (elem = next; 2642 elem->data < ies + ieslen && 2643 elem->data + elem->datalen <= ies + ieslen; 2644 elem = next) { 2645 /* elem might be invalid after the memmove */ 2646 next = (void *)(elem->data + elem->datalen); 2647 2648 if (elem->id != frag_id) 2649 break; 2650 2651 elem_datalen = elem->datalen; 2652 2653 if (data) { 2654 if (copied + elem_datalen > data_len) 2655 return -ENOSPC; 2656 2657 memmove(data + copied, elem->data, elem_datalen); 2658 } 2659 2660 copied += elem_datalen; 2661 2662 /* Only the last fragment may be short */ 2663 if (elem_datalen != 255) 2664 break; 2665 } 2666 2667 return copied; 2668 } 2669 EXPORT_SYMBOL(cfg80211_defragment_element); 2670 2671 struct cfg80211_mle { 2672 struct ieee80211_multi_link_elem *mle; 2673 struct ieee80211_mle_per_sta_profile 2674 *sta_prof[IEEE80211_MLD_MAX_NUM_LINKS]; 2675 ssize_t sta_prof_len[IEEE80211_MLD_MAX_NUM_LINKS]; 2676 2677 u8 data[]; 2678 }; 2679 2680 static struct cfg80211_mle * 2681 cfg80211_defrag_mle(const struct element *mle, const u8 *ie, size_t ielen, 2682 gfp_t gfp) 2683 { 2684 const struct element *elem; 2685 struct cfg80211_mle *res; 2686 size_t buf_len; 2687 ssize_t mle_len; 2688 u8 common_size, idx; 2689 2690 if (!mle || !ieee80211_mle_size_ok(mle->data + 1, mle->datalen - 1)) 2691 return NULL; 2692 2693 /* Required length for first defragmentation */ 2694 buf_len = mle->datalen - 1; 2695 for_each_element(elem, mle->data + mle->datalen, 2696 ie + ielen - mle->data - mle->datalen) { 2697 if (elem->id != WLAN_EID_FRAGMENT) 2698 break; 2699 2700 buf_len += elem->datalen; 2701 } 2702 2703 res = kzalloc(struct_size(res, data, buf_len), gfp); 2704 if (!res) 2705 return NULL; 2706 2707 mle_len = cfg80211_defragment_element(mle, ie, ielen, 2708 res->data, buf_len, 2709 WLAN_EID_FRAGMENT); 2710 if (mle_len < 0) 2711 goto error; 2712 2713 res->mle = (void *)res->data; 2714 2715 /* Find the sub-element area in the buffer */ 2716 common_size = ieee80211_mle_common_size((u8 *)res->mle); 2717 ie = res->data + common_size; 2718 ielen = mle_len - common_size; 2719 2720 idx = 0; 2721 for_each_element_id(elem, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE, 2722 ie, ielen) { 2723 res->sta_prof[idx] = (void *)elem->data; 2724 res->sta_prof_len[idx] = elem->datalen; 2725 2726 idx++; 2727 if (idx >= IEEE80211_MLD_MAX_NUM_LINKS) 2728 break; 2729 } 2730 if (!for_each_element_completed(elem, ie, ielen)) 2731 goto error; 2732 2733 /* Defragment sta_info in-place */ 2734 for (idx = 0; idx < IEEE80211_MLD_MAX_NUM_LINKS && res->sta_prof[idx]; 2735 idx++) { 2736 if (res->sta_prof_len[idx] < 255) 2737 continue; 2738 2739 elem = (void *)res->sta_prof[idx] - 2; 2740 2741 if (idx + 1 < ARRAY_SIZE(res->sta_prof) && 2742 res->sta_prof[idx + 1]) 2743 buf_len = (u8 *)res->sta_prof[idx + 1] - 2744 (u8 *)res->sta_prof[idx]; 2745 else 2746 buf_len = ielen + ie - (u8 *)elem; 2747 2748 res->sta_prof_len[idx] = 2749 cfg80211_defragment_element(elem, 2750 (u8 *)elem, buf_len, 2751 (u8 *)res->sta_prof[idx], 2752 buf_len, 2753 IEEE80211_MLE_SUBELEM_FRAGMENT); 2754 if (res->sta_prof_len[idx] < 0) 2755 goto error; 2756 } 2757 2758 return res; 2759 2760 error: 2761 kfree(res); 2762 return NULL; 2763 } 2764 2765 struct tbtt_info_iter_data { 2766 const struct ieee80211_neighbor_ap_info *ap_info; 2767 u8 param_ch_count; 2768 u32 use_for; 2769 u8 mld_id, link_id; 2770 bool non_tx; 2771 }; 2772 2773 static enum cfg80211_rnr_iter_ret 2774 cfg802121_mld_ap_rnr_iter(void *_data, u8 type, 2775 const struct ieee80211_neighbor_ap_info *info, 2776 const u8 *tbtt_info, u8 tbtt_info_len) 2777 { 2778 const struct ieee80211_rnr_mld_params *mld_params; 2779 struct tbtt_info_iter_data *data = _data; 2780 u8 link_id; 2781 bool non_tx = false; 2782 2783 if (type == IEEE80211_TBTT_INFO_TYPE_TBTT && 2784 tbtt_info_len >= offsetofend(struct ieee80211_tbtt_info_ge_11, 2785 mld_params)) { 2786 const struct ieee80211_tbtt_info_ge_11 *tbtt_info_ge_11 = 2787 (void *)tbtt_info; 2788 2789 non_tx = (tbtt_info_ge_11->bss_params & 2790 (IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID | 2791 IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID)) == 2792 IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID; 2793 mld_params = &tbtt_info_ge_11->mld_params; 2794 } else if (type == IEEE80211_TBTT_INFO_TYPE_MLD && 2795 tbtt_info_len >= sizeof(struct ieee80211_rnr_mld_params)) 2796 mld_params = (void *)tbtt_info; 2797 else 2798 return RNR_ITER_CONTINUE; 2799 2800 link_id = le16_get_bits(mld_params->params, 2801 IEEE80211_RNR_MLD_PARAMS_LINK_ID); 2802 2803 if (data->mld_id != mld_params->mld_id) 2804 return RNR_ITER_CONTINUE; 2805 2806 if (data->link_id != link_id) 2807 return RNR_ITER_CONTINUE; 2808 2809 data->ap_info = info; 2810 data->param_ch_count = 2811 le16_get_bits(mld_params->params, 2812 IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT); 2813 data->non_tx = non_tx; 2814 2815 if (type == IEEE80211_TBTT_INFO_TYPE_TBTT) 2816 data->use_for = NL80211_BSS_USE_FOR_ALL; 2817 else 2818 data->use_for = NL80211_BSS_USE_FOR_MLD_LINK; 2819 return RNR_ITER_BREAK; 2820 } 2821 2822 static u8 2823 cfg80211_rnr_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id, 2824 const struct ieee80211_neighbor_ap_info **ap_info, 2825 u8 *param_ch_count, bool *non_tx) 2826 { 2827 struct tbtt_info_iter_data data = { 2828 .mld_id = mld_id, 2829 .link_id = link_id, 2830 }; 2831 2832 cfg80211_iter_rnr(ie, ielen, cfg802121_mld_ap_rnr_iter, &data); 2833 2834 *ap_info = data.ap_info; 2835 *param_ch_count = data.param_ch_count; 2836 *non_tx = data.non_tx; 2837 2838 return data.use_for; 2839 } 2840 2841 static struct element * 2842 cfg80211_gen_reporter_rnr(struct cfg80211_bss *source_bss, bool is_mbssid, 2843 bool same_mld, u8 link_id, u8 bss_change_count, 2844 gfp_t gfp) 2845 { 2846 const struct cfg80211_bss_ies *ies; 2847 struct ieee80211_neighbor_ap_info ap_info; 2848 struct ieee80211_tbtt_info_ge_11 tbtt_info; 2849 u32 short_ssid; 2850 const struct element *elem; 2851 struct element *res; 2852 2853 /* 2854 * We only generate the RNR to permit ML lookups. For that we do not 2855 * need an entry for the corresponding transmitting BSS, lets just skip 2856 * it even though it would be easy to add. 2857 */ 2858 if (!same_mld) 2859 return NULL; 2860 2861 /* We could use tx_data->ies if we change cfg80211_calc_short_ssid */ 2862 rcu_read_lock(); 2863 ies = rcu_dereference(source_bss->ies); 2864 2865 ap_info.tbtt_info_len = offsetofend(typeof(tbtt_info), mld_params); 2866 ap_info.tbtt_info_hdr = 2867 u8_encode_bits(IEEE80211_TBTT_INFO_TYPE_TBTT, 2868 IEEE80211_AP_INFO_TBTT_HDR_TYPE) | 2869 u8_encode_bits(0, IEEE80211_AP_INFO_TBTT_HDR_COUNT); 2870 2871 ap_info.channel = ieee80211_frequency_to_channel(source_bss->channel->center_freq); 2872 2873 /* operating class */ 2874 elem = cfg80211_find_elem(WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 2875 ies->data, ies->len); 2876 if (elem && elem->datalen >= 1) { 2877 ap_info.op_class = elem->data[0]; 2878 } else { 2879 struct cfg80211_chan_def chandef; 2880 2881 /* The AP is not providing us with anything to work with. So 2882 * make up a somewhat reasonable operating class, but don't 2883 * bother with it too much as no one will ever use the 2884 * information. 2885 */ 2886 cfg80211_chandef_create(&chandef, source_bss->channel, 2887 NL80211_CHAN_NO_HT); 2888 2889 if (!ieee80211_chandef_to_operating_class(&chandef, 2890 &ap_info.op_class)) 2891 goto out_unlock; 2892 } 2893 2894 /* Just set TBTT offset and PSD 20 to invalid/unknown */ 2895 tbtt_info.tbtt_offset = 255; 2896 tbtt_info.psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED; 2897 2898 memcpy(tbtt_info.bssid, source_bss->bssid, ETH_ALEN); 2899 if (cfg80211_calc_short_ssid(ies, &elem, &short_ssid)) 2900 goto out_unlock; 2901 2902 rcu_read_unlock(); 2903 2904 tbtt_info.short_ssid = cpu_to_le32(short_ssid); 2905 2906 tbtt_info.bss_params = IEEE80211_RNR_TBTT_PARAMS_SAME_SSID; 2907 2908 if (is_mbssid) { 2909 tbtt_info.bss_params |= IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID; 2910 tbtt_info.bss_params |= IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID; 2911 } 2912 2913 tbtt_info.mld_params.mld_id = 0; 2914 tbtt_info.mld_params.params = 2915 le16_encode_bits(link_id, IEEE80211_RNR_MLD_PARAMS_LINK_ID) | 2916 le16_encode_bits(bss_change_count, 2917 IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT); 2918 2919 res = kzalloc(struct_size(res, data, 2920 sizeof(ap_info) + ap_info.tbtt_info_len), 2921 gfp); 2922 if (!res) 2923 return NULL; 2924 2925 /* Copy the data */ 2926 res->id = WLAN_EID_REDUCED_NEIGHBOR_REPORT; 2927 res->datalen = sizeof(ap_info) + ap_info.tbtt_info_len; 2928 memcpy(res->data, &ap_info, sizeof(ap_info)); 2929 memcpy(res->data + sizeof(ap_info), &tbtt_info, ap_info.tbtt_info_len); 2930 2931 return res; 2932 2933 out_unlock: 2934 rcu_read_unlock(); 2935 return NULL; 2936 } 2937 2938 static void 2939 cfg80211_parse_ml_elem_sta_data(struct wiphy *wiphy, 2940 struct cfg80211_inform_single_bss_data *tx_data, 2941 struct cfg80211_bss *source_bss, 2942 const struct element *elem, 2943 gfp_t gfp) 2944 { 2945 struct cfg80211_inform_single_bss_data data = { 2946 .drv_data = tx_data->drv_data, 2947 .ftype = tx_data->ftype, 2948 .source_bss = source_bss, 2949 .bss_source = BSS_SOURCE_STA_PROFILE, 2950 }; 2951 struct element *reporter_rnr = NULL; 2952 struct ieee80211_multi_link_elem *ml_elem; 2953 struct cfg80211_mle *mle; 2954 const struct element *ssid_elem; 2955 const u8 *ssid = NULL; 2956 size_t ssid_len = 0; 2957 u16 control; 2958 u8 ml_common_len; 2959 u8 *new_ie = NULL; 2960 struct cfg80211_bss *bss; 2961 u8 mld_id, reporter_link_id, bss_change_count; 2962 u16 seen_links = 0; 2963 u8 i; 2964 2965 if (!ieee80211_mle_type_ok(elem->data + 1, 2966 IEEE80211_ML_CONTROL_TYPE_BASIC, 2967 elem->datalen - 1)) 2968 return; 2969 2970 ml_elem = (void *)(elem->data + 1); 2971 control = le16_to_cpu(ml_elem->control); 2972 ml_common_len = ml_elem->variable[0]; 2973 2974 /* Must be present when transmitted by an AP (in a probe response) */ 2975 if (!(control & IEEE80211_MLC_BASIC_PRES_BSS_PARAM_CH_CNT) || 2976 !(control & IEEE80211_MLC_BASIC_PRES_LINK_ID) || 2977 !(control & IEEE80211_MLC_BASIC_PRES_MLD_CAPA_OP)) 2978 return; 2979 2980 reporter_link_id = ieee80211_mle_get_link_id(elem->data + 1); 2981 bss_change_count = ieee80211_mle_get_bss_param_ch_cnt(elem->data + 1); 2982 2983 /* 2984 * The MLD ID of the reporting AP is always zero. It is set if the AP 2985 * is part of an MBSSID set and will be non-zero for ML Elements 2986 * relating to a nontransmitted BSS (matching the Multi-BSSID Index, 2987 * Draft P802.11be_D3.2, 35.3.4.2) 2988 */ 2989 mld_id = ieee80211_mle_get_mld_id(elem->data + 1); 2990 2991 /* Fully defrag the ML element for sta information/profile iteration */ 2992 mle = cfg80211_defrag_mle(elem, tx_data->ie, tx_data->ielen, gfp); 2993 if (!mle) 2994 return; 2995 2996 /* No point in doing anything if there is no per-STA profile */ 2997 if (!mle->sta_prof[0]) 2998 goto out; 2999 3000 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); 3001 if (!new_ie) 3002 goto out; 3003 3004 reporter_rnr = cfg80211_gen_reporter_rnr(source_bss, 3005 u16_get_bits(control, 3006 IEEE80211_MLC_BASIC_PRES_MLD_ID), 3007 mld_id == 0, reporter_link_id, 3008 bss_change_count, 3009 gfp); 3010 3011 ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, tx_data->ie, 3012 tx_data->ielen); 3013 if (ssid_elem) { 3014 ssid = ssid_elem->data; 3015 ssid_len = ssid_elem->datalen; 3016 } 3017 3018 for (i = 0; i < ARRAY_SIZE(mle->sta_prof) && mle->sta_prof[i]; i++) { 3019 const struct ieee80211_neighbor_ap_info *ap_info; 3020 enum nl80211_band band; 3021 u32 freq; 3022 const u8 *profile; 3023 ssize_t profile_len; 3024 u8 param_ch_count; 3025 u8 link_id, use_for; 3026 bool non_tx; 3027 3028 if (!ieee80211_mle_basic_sta_prof_size_ok((u8 *)mle->sta_prof[i], 3029 mle->sta_prof_len[i])) 3030 continue; 3031 3032 control = le16_to_cpu(mle->sta_prof[i]->control); 3033 3034 if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE)) 3035 continue; 3036 3037 link_id = u16_get_bits(control, 3038 IEEE80211_MLE_STA_CONTROL_LINK_ID); 3039 if (seen_links & BIT(link_id)) 3040 break; 3041 seen_links |= BIT(link_id); 3042 3043 if (!(control & IEEE80211_MLE_STA_CONTROL_BEACON_INT_PRESENT) || 3044 !(control & IEEE80211_MLE_STA_CONTROL_TSF_OFFS_PRESENT) || 3045 !(control & IEEE80211_MLE_STA_CONTROL_STA_MAC_ADDR_PRESENT)) 3046 continue; 3047 3048 memcpy(data.bssid, mle->sta_prof[i]->variable, ETH_ALEN); 3049 data.beacon_interval = 3050 get_unaligned_le16(mle->sta_prof[i]->variable + 6); 3051 data.tsf = tx_data->tsf + 3052 get_unaligned_le64(mle->sta_prof[i]->variable + 8); 3053 3054 /* sta_info_len counts itself */ 3055 profile = mle->sta_prof[i]->variable + 3056 mle->sta_prof[i]->sta_info_len - 1; 3057 profile_len = (u8 *)mle->sta_prof[i] + mle->sta_prof_len[i] - 3058 profile; 3059 3060 if (profile_len < 2) 3061 continue; 3062 3063 data.capability = get_unaligned_le16(profile); 3064 profile += 2; 3065 profile_len -= 2; 3066 3067 /* Find in RNR to look up channel information */ 3068 use_for = cfg80211_rnr_info_for_mld_ap(tx_data->ie, 3069 tx_data->ielen, 3070 mld_id, link_id, 3071 &ap_info, 3072 ¶m_ch_count, 3073 &non_tx); 3074 if (!use_for) 3075 continue; 3076 3077 /* 3078 * As of 802.11be_D5.0, the specification does not give us any 3079 * way of discovering both the MaxBSSID and the Multiple-BSSID 3080 * Index. It does seem like the Multiple-BSSID Index element 3081 * may be provided, but section 9.4.2.45 explicitly forbids 3082 * including a Multiple-BSSID Element (in this case without any 3083 * subelements). 3084 * Without both pieces of information we cannot calculate the 3085 * reference BSSID, so simply ignore the BSS. 3086 */ 3087 if (non_tx) 3088 continue; 3089 3090 /* We could sanity check the BSSID is included */ 3091 3092 if (!ieee80211_operating_class_to_band(ap_info->op_class, 3093 &band)) 3094 continue; 3095 3096 freq = ieee80211_channel_to_freq_khz(ap_info->channel, band); 3097 data.channel = ieee80211_get_channel_khz(wiphy, freq); 3098 3099 /* Skip if RNR element specifies an unsupported channel */ 3100 if (!data.channel) 3101 continue; 3102 3103 /* Skip if BSS entry generated from MBSSID or DIRECT source 3104 * frame data available already. 3105 */ 3106 bss = cfg80211_get_bss(wiphy, data.channel, data.bssid, ssid, 3107 ssid_len, IEEE80211_BSS_TYPE_ANY, 3108 IEEE80211_PRIVACY_ANY); 3109 if (bss) { 3110 struct cfg80211_internal_bss *ibss = bss_from_pub(bss); 3111 3112 if (data.capability == bss->capability && 3113 ibss->bss_source != BSS_SOURCE_STA_PROFILE) { 3114 cfg80211_put_bss(wiphy, bss); 3115 continue; 3116 } 3117 cfg80211_put_bss(wiphy, bss); 3118 } 3119 3120 if (use_for == NL80211_BSS_USE_FOR_MLD_LINK && 3121 !(wiphy->flags & WIPHY_FLAG_SUPPORTS_NSTR_NONPRIMARY)) { 3122 use_for = 0; 3123 data.cannot_use_reasons = 3124 NL80211_BSS_CANNOT_USE_NSTR_NONPRIMARY; 3125 } 3126 data.use_for = use_for; 3127 3128 /* Generate new elements */ 3129 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); 3130 data.ie = new_ie; 3131 data.ielen = cfg80211_gen_new_ie(tx_data->ie, tx_data->ielen, 3132 profile, profile_len, 3133 new_ie, 3134 IEEE80211_MAX_DATA_LEN); 3135 if (!data.ielen) 3136 continue; 3137 3138 /* The generated elements do not contain: 3139 * - Basic ML element 3140 * - A TBTT entry in the RNR for the transmitting AP 3141 * 3142 * This information is needed both internally and in userspace 3143 * as such, we should append it here. 3144 */ 3145 if (data.ielen + 3 + sizeof(*ml_elem) + ml_common_len > 3146 IEEE80211_MAX_DATA_LEN) 3147 continue; 3148 3149 /* Copy the Basic Multi-Link element including the common 3150 * information, and then fix up the link ID and BSS param 3151 * change count. 3152 * Note that the ML element length has been verified and we 3153 * also checked that it contains the link ID. 3154 */ 3155 new_ie[data.ielen++] = WLAN_EID_EXTENSION; 3156 new_ie[data.ielen++] = 1 + sizeof(*ml_elem) + ml_common_len; 3157 new_ie[data.ielen++] = WLAN_EID_EXT_EHT_MULTI_LINK; 3158 memcpy(new_ie + data.ielen, ml_elem, 3159 sizeof(*ml_elem) + ml_common_len); 3160 3161 new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN] = link_id; 3162 new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN + 1] = 3163 param_ch_count; 3164 3165 data.ielen += sizeof(*ml_elem) + ml_common_len; 3166 3167 if (reporter_rnr && (use_for & NL80211_BSS_USE_FOR_NORMAL)) { 3168 if (data.ielen + sizeof(struct element) + 3169 reporter_rnr->datalen > IEEE80211_MAX_DATA_LEN) 3170 continue; 3171 3172 memcpy(new_ie + data.ielen, reporter_rnr, 3173 sizeof(struct element) + reporter_rnr->datalen); 3174 data.ielen += sizeof(struct element) + 3175 reporter_rnr->datalen; 3176 } 3177 3178 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp); 3179 if (!bss) 3180 break; 3181 cfg80211_put_bss(wiphy, bss); 3182 } 3183 3184 out: 3185 kfree(reporter_rnr); 3186 kfree(new_ie); 3187 kfree(mle); 3188 } 3189 3190 static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy, 3191 struct cfg80211_inform_single_bss_data *tx_data, 3192 struct cfg80211_bss *source_bss, 3193 gfp_t gfp) 3194 { 3195 const struct element *elem; 3196 3197 if (!source_bss) 3198 return; 3199 3200 if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP) 3201 return; 3202 3203 for_each_element_extid(elem, WLAN_EID_EXT_EHT_MULTI_LINK, 3204 tx_data->ie, tx_data->ielen) 3205 cfg80211_parse_ml_elem_sta_data(wiphy, tx_data, source_bss, 3206 elem, gfp); 3207 } 3208 3209 struct cfg80211_bss * 3210 cfg80211_inform_bss_data(struct wiphy *wiphy, 3211 struct cfg80211_inform_bss *data, 3212 enum cfg80211_bss_frame_type ftype, 3213 const u8 *bssid, u64 tsf, u16 capability, 3214 u16 beacon_interval, const u8 *ie, size_t ielen, 3215 gfp_t gfp) 3216 { 3217 struct cfg80211_inform_single_bss_data inform_data = { 3218 .drv_data = data, 3219 .ftype = ftype, 3220 .tsf = tsf, 3221 .capability = capability, 3222 .beacon_interval = beacon_interval, 3223 .ie = ie, 3224 .ielen = ielen, 3225 .use_for = data->restrict_use ? 3226 data->use_for : 3227 NL80211_BSS_USE_FOR_ALL, 3228 .cannot_use_reasons = data->cannot_use_reasons, 3229 }; 3230 struct cfg80211_bss *res; 3231 3232 memcpy(inform_data.bssid, bssid, ETH_ALEN); 3233 3234 res = cfg80211_inform_single_bss_data(wiphy, &inform_data, gfp); 3235 if (!res) 3236 return NULL; 3237 3238 /* don't do any further MBSSID/ML handling for S1G */ 3239 if (ftype == CFG80211_BSS_FTYPE_S1G_BEACON) 3240 return res; 3241 3242 cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp); 3243 3244 cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp); 3245 3246 return res; 3247 } 3248 EXPORT_SYMBOL(cfg80211_inform_bss_data); 3249 3250 struct cfg80211_bss * 3251 cfg80211_inform_bss_frame_data(struct wiphy *wiphy, 3252 struct cfg80211_inform_bss *data, 3253 struct ieee80211_mgmt *mgmt, size_t len, 3254 gfp_t gfp) 3255 { 3256 size_t min_hdr_len; 3257 struct ieee80211_ext *ext = NULL; 3258 enum cfg80211_bss_frame_type ftype; 3259 u16 beacon_interval; 3260 const u8 *bssid; 3261 u16 capability; 3262 const u8 *ie; 3263 size_t ielen; 3264 u64 tsf; 3265 size_t s1g_optional_len; 3266 3267 if (WARN_ON(!mgmt)) 3268 return NULL; 3269 3270 if (WARN_ON(!wiphy)) 3271 return NULL; 3272 3273 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != 3274 offsetof(struct ieee80211_mgmt, u.beacon.variable)); 3275 3276 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); 3277 3278 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { 3279 ext = (void *) mgmt; 3280 s1g_optional_len = 3281 ieee80211_s1g_optional_len(ext->frame_control); 3282 min_hdr_len = 3283 offsetof(struct ieee80211_ext, u.s1g_beacon.variable) + 3284 s1g_optional_len; 3285 } else { 3286 /* same for beacons */ 3287 min_hdr_len = offsetof(struct ieee80211_mgmt, 3288 u.probe_resp.variable); 3289 } 3290 3291 if (WARN_ON(len < min_hdr_len)) 3292 return NULL; 3293 3294 ielen = len - min_hdr_len; 3295 ie = mgmt->u.probe_resp.variable; 3296 if (ext) { 3297 const struct ieee80211_s1g_bcn_compat_ie *compat; 3298 const struct element *elem; 3299 3300 ie = ext->u.s1g_beacon.variable + s1g_optional_len; 3301 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT, ie, ielen); 3302 if (!elem) 3303 return NULL; 3304 if (elem->datalen < sizeof(*compat)) 3305 return NULL; 3306 compat = (void *)elem->data; 3307 bssid = ext->u.s1g_beacon.sa; 3308 capability = le16_to_cpu(compat->compat_info); 3309 beacon_interval = le16_to_cpu(compat->beacon_int); 3310 } else { 3311 bssid = mgmt->bssid; 3312 beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 3313 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 3314 } 3315 3316 tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 3317 3318 if (ieee80211_is_probe_resp(mgmt->frame_control)) 3319 ftype = CFG80211_BSS_FTYPE_PRESP; 3320 else if (ext) 3321 ftype = CFG80211_BSS_FTYPE_S1G_BEACON; 3322 else 3323 ftype = CFG80211_BSS_FTYPE_BEACON; 3324 3325 return cfg80211_inform_bss_data(wiphy, data, ftype, 3326 bssid, tsf, capability, 3327 beacon_interval, ie, ielen, 3328 gfp); 3329 } 3330 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); 3331 3332 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 3333 { 3334 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 3335 3336 if (!pub) 3337 return; 3338 3339 spin_lock_bh(&rdev->bss_lock); 3340 bss_ref_get(rdev, bss_from_pub(pub)); 3341 spin_unlock_bh(&rdev->bss_lock); 3342 } 3343 EXPORT_SYMBOL(cfg80211_ref_bss); 3344 3345 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 3346 { 3347 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 3348 3349 if (!pub) 3350 return; 3351 3352 spin_lock_bh(&rdev->bss_lock); 3353 bss_ref_put(rdev, bss_from_pub(pub)); 3354 spin_unlock_bh(&rdev->bss_lock); 3355 } 3356 EXPORT_SYMBOL(cfg80211_put_bss); 3357 3358 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 3359 { 3360 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 3361 struct cfg80211_internal_bss *bss, *tmp1; 3362 struct cfg80211_bss *nontrans_bss, *tmp; 3363 3364 if (WARN_ON(!pub)) 3365 return; 3366 3367 bss = bss_from_pub(pub); 3368 3369 spin_lock_bh(&rdev->bss_lock); 3370 if (list_empty(&bss->list)) 3371 goto out; 3372 3373 list_for_each_entry_safe(nontrans_bss, tmp, 3374 &pub->nontrans_list, 3375 nontrans_list) { 3376 tmp1 = bss_from_pub(nontrans_bss); 3377 if (__cfg80211_unlink_bss(rdev, tmp1)) 3378 rdev->bss_generation++; 3379 } 3380 3381 if (__cfg80211_unlink_bss(rdev, bss)) 3382 rdev->bss_generation++; 3383 out: 3384 spin_unlock_bh(&rdev->bss_lock); 3385 } 3386 EXPORT_SYMBOL(cfg80211_unlink_bss); 3387 3388 void cfg80211_bss_iter(struct wiphy *wiphy, 3389 struct cfg80211_chan_def *chandef, 3390 void (*iter)(struct wiphy *wiphy, 3391 struct cfg80211_bss *bss, 3392 void *data), 3393 void *iter_data) 3394 { 3395 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 3396 struct cfg80211_internal_bss *bss; 3397 3398 spin_lock_bh(&rdev->bss_lock); 3399 3400 list_for_each_entry(bss, &rdev->bss_list, list) { 3401 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel, 3402 false)) 3403 iter(wiphy, &bss->pub, iter_data); 3404 } 3405 3406 spin_unlock_bh(&rdev->bss_lock); 3407 } 3408 EXPORT_SYMBOL(cfg80211_bss_iter); 3409 3410 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev, 3411 unsigned int link_id, 3412 struct ieee80211_channel *chan) 3413 { 3414 struct wiphy *wiphy = wdev->wiphy; 3415 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 3416 struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss; 3417 struct cfg80211_internal_bss *new = NULL; 3418 struct cfg80211_internal_bss *bss; 3419 struct cfg80211_bss *nontrans_bss; 3420 struct cfg80211_bss *tmp; 3421 3422 spin_lock_bh(&rdev->bss_lock); 3423 3424 /* 3425 * Some APs use CSA also for bandwidth changes, i.e., without actually 3426 * changing the control channel, so no need to update in such a case. 3427 */ 3428 if (cbss->pub.channel == chan) 3429 goto done; 3430 3431 /* use transmitting bss */ 3432 if (cbss->pub.transmitted_bss) 3433 cbss = bss_from_pub(cbss->pub.transmitted_bss); 3434 3435 cbss->pub.channel = chan; 3436 3437 list_for_each_entry(bss, &rdev->bss_list, list) { 3438 if (!cfg80211_bss_type_match(bss->pub.capability, 3439 bss->pub.channel->band, 3440 wdev->conn_bss_type)) 3441 continue; 3442 3443 if (bss == cbss) 3444 continue; 3445 3446 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) { 3447 new = bss; 3448 break; 3449 } 3450 } 3451 3452 if (new) { 3453 /* to save time, update IEs for transmitting bss only */ 3454 cfg80211_update_known_bss(rdev, cbss, new, false); 3455 new->pub.proberesp_ies = NULL; 3456 new->pub.beacon_ies = NULL; 3457 3458 list_for_each_entry_safe(nontrans_bss, tmp, 3459 &new->pub.nontrans_list, 3460 nontrans_list) { 3461 bss = bss_from_pub(nontrans_bss); 3462 if (__cfg80211_unlink_bss(rdev, bss)) 3463 rdev->bss_generation++; 3464 } 3465 3466 WARN_ON(atomic_read(&new->hold)); 3467 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new))) 3468 rdev->bss_generation++; 3469 } 3470 cfg80211_rehash_bss(rdev, cbss); 3471 3472 list_for_each_entry_safe(nontrans_bss, tmp, 3473 &cbss->pub.nontrans_list, 3474 nontrans_list) { 3475 bss = bss_from_pub(nontrans_bss); 3476 bss->pub.channel = chan; 3477 cfg80211_rehash_bss(rdev, bss); 3478 } 3479 3480 done: 3481 spin_unlock_bh(&rdev->bss_lock); 3482 } 3483 3484 #ifdef CONFIG_CFG80211_WEXT 3485 static struct cfg80211_registered_device * 3486 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 3487 { 3488 struct cfg80211_registered_device *rdev; 3489 struct net_device *dev; 3490 3491 ASSERT_RTNL(); 3492 3493 dev = dev_get_by_index(net, ifindex); 3494 if (!dev) 3495 return ERR_PTR(-ENODEV); 3496 if (dev->ieee80211_ptr) 3497 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); 3498 else 3499 rdev = ERR_PTR(-ENODEV); 3500 dev_put(dev); 3501 return rdev; 3502 } 3503 3504 int cfg80211_wext_siwscan(struct net_device *dev, 3505 struct iw_request_info *info, 3506 union iwreq_data *wrqu, char *extra) 3507 { 3508 struct cfg80211_registered_device *rdev; 3509 struct wiphy *wiphy; 3510 struct iw_scan_req *wreq = NULL; 3511 struct cfg80211_scan_request_int *creq; 3512 int i, err, n_channels = 0; 3513 enum nl80211_band band; 3514 3515 if (!netif_running(dev)) 3516 return -ENETDOWN; 3517 3518 if (wrqu->data.length == sizeof(struct iw_scan_req)) 3519 wreq = (struct iw_scan_req *)extra; 3520 3521 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 3522 3523 if (IS_ERR(rdev)) 3524 return PTR_ERR(rdev); 3525 3526 if (rdev->scan_req || rdev->scan_msg) 3527 return -EBUSY; 3528 3529 wiphy = &rdev->wiphy; 3530 3531 /* Determine number of channels, needed to allocate creq */ 3532 if (wreq && wreq->num_channels) { 3533 /* Passed from userspace so should be checked */ 3534 if (unlikely(wreq->num_channels > IW_MAX_FREQUENCIES)) 3535 return -EINVAL; 3536 n_channels = wreq->num_channels; 3537 } else { 3538 n_channels = ieee80211_get_num_supported_channels(wiphy); 3539 } 3540 3541 creq = kzalloc(struct_size(creq, req.channels, n_channels) + 3542 sizeof(struct cfg80211_ssid), 3543 GFP_ATOMIC); 3544 if (!creq) 3545 return -ENOMEM; 3546 3547 creq->req.wiphy = wiphy; 3548 creq->req.wdev = dev->ieee80211_ptr; 3549 /* SSIDs come after channels */ 3550 creq->req.ssids = (void *)creq + 3551 struct_size(creq, req.channels, n_channels); 3552 creq->req.n_channels = n_channels; 3553 creq->req.n_ssids = 1; 3554 creq->req.scan_start = jiffies; 3555 3556 /* translate "Scan on frequencies" request */ 3557 i = 0; 3558 for (band = 0; band < NUM_NL80211_BANDS; band++) { 3559 int j; 3560 3561 if (!wiphy->bands[band]) 3562 continue; 3563 3564 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 3565 struct ieee80211_channel *chan; 3566 3567 /* ignore disabled channels */ 3568 chan = &wiphy->bands[band]->channels[j]; 3569 if (chan->flags & IEEE80211_CHAN_DISABLED || 3570 !cfg80211_wdev_channel_allowed(creq->req.wdev, chan)) 3571 continue; 3572 3573 /* If we have a wireless request structure and the 3574 * wireless request specifies frequencies, then search 3575 * for the matching hardware channel. 3576 */ 3577 if (wreq && wreq->num_channels) { 3578 int k; 3579 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 3580 for (k = 0; k < wreq->num_channels; k++) { 3581 struct iw_freq *freq = 3582 &wreq->channel_list[k]; 3583 int wext_freq = 3584 cfg80211_wext_freq(freq); 3585 3586 if (wext_freq == wiphy_freq) 3587 goto wext_freq_found; 3588 } 3589 goto wext_freq_not_found; 3590 } 3591 3592 wext_freq_found: 3593 creq->req.channels[i] = 3594 &wiphy->bands[band]->channels[j]; 3595 i++; 3596 wext_freq_not_found: ; 3597 } 3598 } 3599 /* No channels found? */ 3600 if (!i) { 3601 err = -EINVAL; 3602 goto out; 3603 } 3604 3605 /* Set real number of channels specified in creq->req.channels[] */ 3606 creq->req.n_channels = i; 3607 3608 /* translate "Scan for SSID" request */ 3609 if (wreq) { 3610 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 3611 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) 3612 return -EINVAL; 3613 memcpy(creq->req.ssids[0].ssid, wreq->essid, 3614 wreq->essid_len); 3615 creq->req.ssids[0].ssid_len = wreq->essid_len; 3616 } 3617 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) { 3618 creq->req.ssids = NULL; 3619 creq->req.n_ssids = 0; 3620 } 3621 } 3622 3623 for (i = 0; i < NUM_NL80211_BANDS; i++) 3624 if (wiphy->bands[i]) 3625 creq->req.rates[i] = 3626 (1 << wiphy->bands[i]->n_bitrates) - 1; 3627 3628 eth_broadcast_addr(creq->req.bssid); 3629 3630 scoped_guard(wiphy, &rdev->wiphy) { 3631 rdev->scan_req = creq; 3632 err = rdev_scan(rdev, creq); 3633 if (err) { 3634 rdev->scan_req = NULL; 3635 /* creq will be freed below */ 3636 } else { 3637 nl80211_send_scan_start(rdev, dev->ieee80211_ptr); 3638 /* creq now owned by driver */ 3639 creq = NULL; 3640 dev_hold(dev); 3641 } 3642 } 3643 3644 out: 3645 kfree(creq); 3646 return err; 3647 } 3648 3649 static char *ieee80211_scan_add_ies(struct iw_request_info *info, 3650 const struct cfg80211_bss_ies *ies, 3651 char *current_ev, char *end_buf) 3652 { 3653 const u8 *pos, *end, *next; 3654 struct iw_event iwe; 3655 3656 if (!ies) 3657 return current_ev; 3658 3659 /* 3660 * If needed, fragment the IEs buffer (at IE boundaries) into short 3661 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 3662 */ 3663 pos = ies->data; 3664 end = pos + ies->len; 3665 3666 while (end - pos > IW_GENERIC_IE_MAX) { 3667 next = pos + 2 + pos[1]; 3668 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 3669 next = next + 2 + next[1]; 3670 3671 memset(&iwe, 0, sizeof(iwe)); 3672 iwe.cmd = IWEVGENIE; 3673 iwe.u.data.length = next - pos; 3674 current_ev = iwe_stream_add_point_check(info, current_ev, 3675 end_buf, &iwe, 3676 (void *)pos); 3677 if (IS_ERR(current_ev)) 3678 return current_ev; 3679 pos = next; 3680 } 3681 3682 if (end > pos) { 3683 memset(&iwe, 0, sizeof(iwe)); 3684 iwe.cmd = IWEVGENIE; 3685 iwe.u.data.length = end - pos; 3686 current_ev = iwe_stream_add_point_check(info, current_ev, 3687 end_buf, &iwe, 3688 (void *)pos); 3689 if (IS_ERR(current_ev)) 3690 return current_ev; 3691 } 3692 3693 return current_ev; 3694 } 3695 3696 static char * 3697 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 3698 struct cfg80211_internal_bss *bss, char *current_ev, 3699 char *end_buf) 3700 { 3701 const struct cfg80211_bss_ies *ies; 3702 struct iw_event iwe; 3703 const u8 *ie; 3704 u8 buf[50]; 3705 u8 *cfg, *p, *tmp; 3706 int rem, i, sig; 3707 bool ismesh = false; 3708 3709 memset(&iwe, 0, sizeof(iwe)); 3710 iwe.cmd = SIOCGIWAP; 3711 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 3712 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 3713 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, 3714 IW_EV_ADDR_LEN); 3715 if (IS_ERR(current_ev)) 3716 return current_ev; 3717 3718 memset(&iwe, 0, sizeof(iwe)); 3719 iwe.cmd = SIOCGIWFREQ; 3720 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 3721 iwe.u.freq.e = 0; 3722 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, 3723 IW_EV_FREQ_LEN); 3724 if (IS_ERR(current_ev)) 3725 return current_ev; 3726 3727 memset(&iwe, 0, sizeof(iwe)); 3728 iwe.cmd = SIOCGIWFREQ; 3729 iwe.u.freq.m = bss->pub.channel->center_freq; 3730 iwe.u.freq.e = 6; 3731 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, 3732 IW_EV_FREQ_LEN); 3733 if (IS_ERR(current_ev)) 3734 return current_ev; 3735 3736 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 3737 memset(&iwe, 0, sizeof(iwe)); 3738 iwe.cmd = IWEVQUAL; 3739 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 3740 IW_QUAL_NOISE_INVALID | 3741 IW_QUAL_QUAL_UPDATED; 3742 switch (wiphy->signal_type) { 3743 case CFG80211_SIGNAL_TYPE_MBM: 3744 sig = bss->pub.signal / 100; 3745 iwe.u.qual.level = sig; 3746 iwe.u.qual.updated |= IW_QUAL_DBM; 3747 if (sig < -110) /* rather bad */ 3748 sig = -110; 3749 else if (sig > -40) /* perfect */ 3750 sig = -40; 3751 /* will give a range of 0 .. 70 */ 3752 iwe.u.qual.qual = sig + 110; 3753 break; 3754 case CFG80211_SIGNAL_TYPE_UNSPEC: 3755 iwe.u.qual.level = bss->pub.signal; 3756 /* will give range 0 .. 100 */ 3757 iwe.u.qual.qual = bss->pub.signal; 3758 break; 3759 default: 3760 /* not reached */ 3761 break; 3762 } 3763 current_ev = iwe_stream_add_event_check(info, current_ev, 3764 end_buf, &iwe, 3765 IW_EV_QUAL_LEN); 3766 if (IS_ERR(current_ev)) 3767 return current_ev; 3768 } 3769 3770 memset(&iwe, 0, sizeof(iwe)); 3771 iwe.cmd = SIOCGIWENCODE; 3772 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 3773 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 3774 else 3775 iwe.u.data.flags = IW_ENCODE_DISABLED; 3776 iwe.u.data.length = 0; 3777 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, 3778 &iwe, ""); 3779 if (IS_ERR(current_ev)) 3780 return current_ev; 3781 3782 rcu_read_lock(); 3783 ies = rcu_dereference(bss->pub.ies); 3784 rem = ies->len; 3785 ie = ies->data; 3786 3787 while (rem >= 2) { 3788 /* invalid data */ 3789 if (ie[1] > rem - 2) 3790 break; 3791 3792 switch (ie[0]) { 3793 case WLAN_EID_SSID: 3794 memset(&iwe, 0, sizeof(iwe)); 3795 iwe.cmd = SIOCGIWESSID; 3796 iwe.u.data.length = ie[1]; 3797 iwe.u.data.flags = 1; 3798 current_ev = iwe_stream_add_point_check(info, 3799 current_ev, 3800 end_buf, &iwe, 3801 (u8 *)ie + 2); 3802 if (IS_ERR(current_ev)) 3803 goto unlock; 3804 break; 3805 case WLAN_EID_MESH_ID: 3806 memset(&iwe, 0, sizeof(iwe)); 3807 iwe.cmd = SIOCGIWESSID; 3808 iwe.u.data.length = ie[1]; 3809 iwe.u.data.flags = 1; 3810 current_ev = iwe_stream_add_point_check(info, 3811 current_ev, 3812 end_buf, &iwe, 3813 (u8 *)ie + 2); 3814 if (IS_ERR(current_ev)) 3815 goto unlock; 3816 break; 3817 case WLAN_EID_MESH_CONFIG: 3818 ismesh = true; 3819 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 3820 break; 3821 cfg = (u8 *)ie + 2; 3822 memset(&iwe, 0, sizeof(iwe)); 3823 iwe.cmd = IWEVCUSTOM; 3824 iwe.u.data.length = sprintf(buf, 3825 "Mesh Network Path Selection Protocol ID: 0x%02X", 3826 cfg[0]); 3827 current_ev = iwe_stream_add_point_check(info, 3828 current_ev, 3829 end_buf, 3830 &iwe, buf); 3831 if (IS_ERR(current_ev)) 3832 goto unlock; 3833 iwe.u.data.length = sprintf(buf, 3834 "Path Selection Metric ID: 0x%02X", 3835 cfg[1]); 3836 current_ev = iwe_stream_add_point_check(info, 3837 current_ev, 3838 end_buf, 3839 &iwe, buf); 3840 if (IS_ERR(current_ev)) 3841 goto unlock; 3842 iwe.u.data.length = sprintf(buf, 3843 "Congestion Control Mode ID: 0x%02X", 3844 cfg[2]); 3845 current_ev = iwe_stream_add_point_check(info, 3846 current_ev, 3847 end_buf, 3848 &iwe, buf); 3849 if (IS_ERR(current_ev)) 3850 goto unlock; 3851 iwe.u.data.length = sprintf(buf, 3852 "Synchronization ID: 0x%02X", 3853 cfg[3]); 3854 current_ev = iwe_stream_add_point_check(info, 3855 current_ev, 3856 end_buf, 3857 &iwe, buf); 3858 if (IS_ERR(current_ev)) 3859 goto unlock; 3860 iwe.u.data.length = sprintf(buf, 3861 "Authentication ID: 0x%02X", 3862 cfg[4]); 3863 current_ev = iwe_stream_add_point_check(info, 3864 current_ev, 3865 end_buf, 3866 &iwe, buf); 3867 if (IS_ERR(current_ev)) 3868 goto unlock; 3869 iwe.u.data.length = sprintf(buf, 3870 "Formation Info: 0x%02X", 3871 cfg[5]); 3872 current_ev = iwe_stream_add_point_check(info, 3873 current_ev, 3874 end_buf, 3875 &iwe, buf); 3876 if (IS_ERR(current_ev)) 3877 goto unlock; 3878 iwe.u.data.length = sprintf(buf, 3879 "Capabilities: 0x%02X", 3880 cfg[6]); 3881 current_ev = iwe_stream_add_point_check(info, 3882 current_ev, 3883 end_buf, 3884 &iwe, buf); 3885 if (IS_ERR(current_ev)) 3886 goto unlock; 3887 break; 3888 case WLAN_EID_SUPP_RATES: 3889 case WLAN_EID_EXT_SUPP_RATES: 3890 /* display all supported rates in readable format */ 3891 p = current_ev + iwe_stream_lcp_len(info); 3892 3893 memset(&iwe, 0, sizeof(iwe)); 3894 iwe.cmd = SIOCGIWRATE; 3895 /* Those two flags are ignored... */ 3896 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 3897 3898 for (i = 0; i < ie[1]; i++) { 3899 iwe.u.bitrate.value = 3900 ((ie[i + 2] & 0x7f) * 500000); 3901 tmp = p; 3902 p = iwe_stream_add_value(info, current_ev, p, 3903 end_buf, &iwe, 3904 IW_EV_PARAM_LEN); 3905 if (p == tmp) { 3906 current_ev = ERR_PTR(-E2BIG); 3907 goto unlock; 3908 } 3909 } 3910 current_ev = p; 3911 break; 3912 } 3913 rem -= ie[1] + 2; 3914 ie += ie[1] + 2; 3915 } 3916 3917 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 3918 ismesh) { 3919 memset(&iwe, 0, sizeof(iwe)); 3920 iwe.cmd = SIOCGIWMODE; 3921 if (ismesh) 3922 iwe.u.mode = IW_MODE_MESH; 3923 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 3924 iwe.u.mode = IW_MODE_MASTER; 3925 else 3926 iwe.u.mode = IW_MODE_ADHOC; 3927 current_ev = iwe_stream_add_event_check(info, current_ev, 3928 end_buf, &iwe, 3929 IW_EV_UINT_LEN); 3930 if (IS_ERR(current_ev)) 3931 goto unlock; 3932 } 3933 3934 memset(&iwe, 0, sizeof(iwe)); 3935 iwe.cmd = IWEVCUSTOM; 3936 iwe.u.data.length = sprintf(buf, "tsf=%016llx", 3937 (unsigned long long)(ies->tsf)); 3938 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, 3939 &iwe, buf); 3940 if (IS_ERR(current_ev)) 3941 goto unlock; 3942 memset(&iwe, 0, sizeof(iwe)); 3943 iwe.cmd = IWEVCUSTOM; 3944 iwe.u.data.length = sprintf(buf, " Last beacon: %ums ago", 3945 elapsed_jiffies_msecs(bss->ts)); 3946 current_ev = iwe_stream_add_point_check(info, current_ev, 3947 end_buf, &iwe, buf); 3948 if (IS_ERR(current_ev)) 3949 goto unlock; 3950 3951 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); 3952 3953 unlock: 3954 rcu_read_unlock(); 3955 return current_ev; 3956 } 3957 3958 3959 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, 3960 struct iw_request_info *info, 3961 char *buf, size_t len) 3962 { 3963 char *current_ev = buf; 3964 char *end_buf = buf + len; 3965 struct cfg80211_internal_bss *bss; 3966 int err = 0; 3967 3968 spin_lock_bh(&rdev->bss_lock); 3969 cfg80211_bss_expire(rdev); 3970 3971 list_for_each_entry(bss, &rdev->bss_list, list) { 3972 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 3973 err = -E2BIG; 3974 break; 3975 } 3976 current_ev = ieee80211_bss(&rdev->wiphy, info, bss, 3977 current_ev, end_buf); 3978 if (IS_ERR(current_ev)) { 3979 err = PTR_ERR(current_ev); 3980 break; 3981 } 3982 } 3983 spin_unlock_bh(&rdev->bss_lock); 3984 3985 if (err) 3986 return err; 3987 return current_ev - buf; 3988 } 3989 3990 3991 int cfg80211_wext_giwscan(struct net_device *dev, 3992 struct iw_request_info *info, 3993 union iwreq_data *wrqu, char *extra) 3994 { 3995 struct iw_point *data = &wrqu->data; 3996 struct cfg80211_registered_device *rdev; 3997 int res; 3998 3999 if (!netif_running(dev)) 4000 return -ENETDOWN; 4001 4002 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 4003 4004 if (IS_ERR(rdev)) 4005 return PTR_ERR(rdev); 4006 4007 if (rdev->scan_req || rdev->scan_msg) 4008 return -EAGAIN; 4009 4010 res = ieee80211_scan_results(rdev, info, extra, data->length); 4011 data->length = 0; 4012 if (res >= 0) { 4013 data->length = res; 4014 res = 0; 4015 } 4016 4017 return res; 4018 } 4019 #endif 4020