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) 2018-2024 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 u8 id, ext_id; 276 unsigned int match_len; 277 278 non_inherit_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE, 279 subie, subie_len); 280 281 /* We copy the elements one by one from the parent to the generated 282 * elements. 283 * If they are not inherited (included in subie or in the non 284 * inheritance element), then we copy all occurrences the first time 285 * we see this element type. 286 */ 287 for_each_element(parent, ie, ielen) { 288 if (parent->id == WLAN_EID_FRAGMENT) 289 continue; 290 291 if (parent->id == WLAN_EID_EXTENSION) { 292 if (parent->datalen < 1) 293 continue; 294 295 id = WLAN_EID_EXTENSION; 296 ext_id = parent->data[0]; 297 match_len = 1; 298 } else { 299 id = parent->id; 300 match_len = 0; 301 } 302 303 /* Find first occurrence in subie */ 304 sub = cfg80211_find_elem_match(id, subie, subie_len, 305 &ext_id, match_len, 0); 306 307 /* Copy from parent if not in subie and inherited */ 308 if (!sub && 309 cfg80211_is_element_inherited(parent, non_inherit_elem)) { 310 if (!cfg80211_copy_elem_with_frags(parent, 311 ie, ielen, 312 &pos, new_ie, 313 new_ie_len)) 314 return 0; 315 316 continue; 317 } 318 319 /* Already copied if an earlier element had the same type */ 320 if (cfg80211_find_elem_match(id, ie, (u8 *)parent - ie, 321 &ext_id, match_len, 0)) 322 continue; 323 324 /* Not inheriting, copy all similar elements from subie */ 325 while (sub) { 326 if (!cfg80211_copy_elem_with_frags(sub, 327 subie, subie_len, 328 &pos, new_ie, 329 new_ie_len)) 330 return 0; 331 332 sub = cfg80211_find_elem_match(id, 333 sub->data + sub->datalen, 334 subie_len + subie - 335 (sub->data + 336 sub->datalen), 337 &ext_id, match_len, 0); 338 } 339 } 340 341 /* The above misses elements that are included in subie but not in the 342 * parent, so do a pass over subie and append those. 343 * Skip the non-tx BSSID caps and non-inheritance element. 344 */ 345 for_each_element(sub, subie, subie_len) { 346 if (sub->id == WLAN_EID_NON_TX_BSSID_CAP) 347 continue; 348 349 if (sub->id == WLAN_EID_FRAGMENT) 350 continue; 351 352 if (sub->id == WLAN_EID_EXTENSION) { 353 if (sub->datalen < 1) 354 continue; 355 356 id = WLAN_EID_EXTENSION; 357 ext_id = sub->data[0]; 358 match_len = 1; 359 360 if (ext_id == WLAN_EID_EXT_NON_INHERITANCE) 361 continue; 362 } else { 363 id = sub->id; 364 match_len = 0; 365 } 366 367 /* Processed if one was included in the parent */ 368 if (cfg80211_find_elem_match(id, ie, ielen, 369 &ext_id, match_len, 0)) 370 continue; 371 372 if (!cfg80211_copy_elem_with_frags(sub, subie, subie_len, 373 &pos, new_ie, new_ie_len)) 374 return 0; 375 } 376 377 return pos - new_ie; 378 } 379 EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_gen_new_ie); 380 381 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid, 382 const u8 *ssid, size_t ssid_len) 383 { 384 const struct cfg80211_bss_ies *ies; 385 const struct element *ssid_elem; 386 387 if (bssid && !ether_addr_equal(a->bssid, bssid)) 388 return false; 389 390 if (!ssid) 391 return true; 392 393 ies = rcu_access_pointer(a->ies); 394 if (!ies) 395 return false; 396 ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); 397 if (!ssid_elem) 398 return false; 399 if (ssid_elem->datalen != ssid_len) 400 return false; 401 return memcmp(ssid_elem->data, ssid, ssid_len) == 0; 402 } 403 404 static int 405 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss, 406 struct cfg80211_bss *nontrans_bss) 407 { 408 const struct element *ssid_elem; 409 struct cfg80211_bss *bss = NULL; 410 411 rcu_read_lock(); 412 ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID); 413 if (!ssid_elem) { 414 rcu_read_unlock(); 415 return -EINVAL; 416 } 417 418 /* check if nontrans_bss is in the list */ 419 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) { 420 if (is_bss(bss, nontrans_bss->bssid, ssid_elem->data, 421 ssid_elem->datalen)) { 422 rcu_read_unlock(); 423 return 0; 424 } 425 } 426 427 rcu_read_unlock(); 428 429 /* 430 * This is a bit weird - it's not on the list, but already on another 431 * one! The only way that could happen is if there's some BSSID/SSID 432 * shared by multiple APs in their multi-BSSID profiles, potentially 433 * with hidden SSID mixed in ... ignore it. 434 */ 435 if (!list_empty(&nontrans_bss->nontrans_list)) 436 return -EINVAL; 437 438 /* add to the list */ 439 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list); 440 return 0; 441 } 442 443 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev, 444 unsigned long expire_time) 445 { 446 struct cfg80211_internal_bss *bss, *tmp; 447 bool expired = false; 448 449 lockdep_assert_held(&rdev->bss_lock); 450 451 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) { 452 if (atomic_read(&bss->hold)) 453 continue; 454 if (!time_after(expire_time, bss->ts)) 455 continue; 456 457 if (__cfg80211_unlink_bss(rdev, bss)) 458 expired = true; 459 } 460 461 if (expired) 462 rdev->bss_generation++; 463 } 464 465 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev) 466 { 467 struct cfg80211_internal_bss *bss, *oldest = NULL; 468 bool ret; 469 470 lockdep_assert_held(&rdev->bss_lock); 471 472 list_for_each_entry(bss, &rdev->bss_list, list) { 473 if (atomic_read(&bss->hold)) 474 continue; 475 476 if (!list_empty(&bss->hidden_list) && 477 !bss->pub.hidden_beacon_bss) 478 continue; 479 480 if (oldest && time_before(oldest->ts, bss->ts)) 481 continue; 482 oldest = bss; 483 } 484 485 if (WARN_ON(!oldest)) 486 return false; 487 488 /* 489 * The callers make sure to increase rdev->bss_generation if anything 490 * gets removed (and a new entry added), so there's no need to also do 491 * it here. 492 */ 493 494 ret = __cfg80211_unlink_bss(rdev, oldest); 495 WARN_ON(!ret); 496 return ret; 497 } 498 499 static u8 cfg80211_parse_bss_param(u8 data, 500 struct cfg80211_colocated_ap *coloc_ap) 501 { 502 coloc_ap->oct_recommended = 503 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED); 504 coloc_ap->same_ssid = 505 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID); 506 coloc_ap->multi_bss = 507 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID); 508 coloc_ap->transmitted_bssid = 509 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID); 510 coloc_ap->unsolicited_probe = 511 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE); 512 coloc_ap->colocated_ess = 513 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS); 514 515 return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP); 516 } 517 518 static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies, 519 const struct element **elem, u32 *s_ssid) 520 { 521 522 *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len); 523 if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN) 524 return -EINVAL; 525 526 *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen); 527 return 0; 528 } 529 530 VISIBLE_IF_CFG80211_KUNIT void 531 cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list) 532 { 533 struct cfg80211_colocated_ap *ap, *tmp_ap; 534 535 list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) { 536 list_del(&ap->list); 537 kfree(ap); 538 } 539 } 540 EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_free_coloc_ap_list); 541 542 static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry, 543 const u8 *pos, u8 length, 544 const struct element *ssid_elem, 545 u32 s_ssid_tmp) 546 { 547 u8 bss_params; 548 549 entry->psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED; 550 551 /* The length is already verified by the caller to contain bss_params */ 552 if (length > sizeof(struct ieee80211_tbtt_info_7_8_9)) { 553 struct ieee80211_tbtt_info_ge_11 *tbtt_info = (void *)pos; 554 555 memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN); 556 entry->short_ssid = le32_to_cpu(tbtt_info->short_ssid); 557 entry->short_ssid_valid = true; 558 559 bss_params = tbtt_info->bss_params; 560 561 /* Ignore disabled links */ 562 if (length >= offsetofend(typeof(*tbtt_info), mld_params)) { 563 if (le16_get_bits(tbtt_info->mld_params.params, 564 IEEE80211_RNR_MLD_PARAMS_DISABLED_LINK)) 565 return -EINVAL; 566 } 567 568 if (length >= offsetofend(struct ieee80211_tbtt_info_ge_11, 569 psd_20)) 570 entry->psd_20 = tbtt_info->psd_20; 571 } else { 572 struct ieee80211_tbtt_info_7_8_9 *tbtt_info = (void *)pos; 573 574 memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN); 575 576 bss_params = tbtt_info->bss_params; 577 578 if (length == offsetofend(struct ieee80211_tbtt_info_7_8_9, 579 psd_20)) 580 entry->psd_20 = tbtt_info->psd_20; 581 } 582 583 /* ignore entries with invalid BSSID */ 584 if (!is_valid_ether_addr(entry->bssid)) 585 return -EINVAL; 586 587 /* skip non colocated APs */ 588 if (!cfg80211_parse_bss_param(bss_params, entry)) 589 return -EINVAL; 590 591 /* no information about the short ssid. Consider the entry valid 592 * for now. It would later be dropped in case there are explicit 593 * SSIDs that need to be matched 594 */ 595 if (!entry->same_ssid && !entry->short_ssid_valid) 596 return 0; 597 598 if (entry->same_ssid) { 599 entry->short_ssid = s_ssid_tmp; 600 entry->short_ssid_valid = true; 601 602 /* 603 * This is safe because we validate datalen in 604 * cfg80211_parse_colocated_ap(), before calling this 605 * function. 606 */ 607 memcpy(&entry->ssid, &ssid_elem->data, ssid_elem->datalen); 608 entry->ssid_len = ssid_elem->datalen; 609 } 610 611 return 0; 612 } 613 614 bool cfg80211_iter_rnr(const u8 *elems, size_t elems_len, 615 enum cfg80211_rnr_iter_ret 616 (*iter)(void *data, u8 type, 617 const struct ieee80211_neighbor_ap_info *info, 618 const u8 *tbtt_info, u8 tbtt_info_len), 619 void *iter_data) 620 { 621 const struct element *rnr; 622 const u8 *pos, *end; 623 624 for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT, 625 elems, elems_len) { 626 const struct ieee80211_neighbor_ap_info *info; 627 628 pos = rnr->data; 629 end = rnr->data + rnr->datalen; 630 631 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */ 632 while (sizeof(*info) <= end - pos) { 633 u8 length, i, count; 634 u8 type; 635 636 info = (void *)pos; 637 count = u8_get_bits(info->tbtt_info_hdr, 638 IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 639 1; 640 length = info->tbtt_info_len; 641 642 pos += sizeof(*info); 643 644 if (count * length > end - pos) 645 return false; 646 647 type = u8_get_bits(info->tbtt_info_hdr, 648 IEEE80211_AP_INFO_TBTT_HDR_TYPE); 649 650 for (i = 0; i < count; i++) { 651 switch (iter(iter_data, type, info, 652 pos, length)) { 653 case RNR_ITER_CONTINUE: 654 break; 655 case RNR_ITER_BREAK: 656 return true; 657 case RNR_ITER_ERROR: 658 return false; 659 } 660 661 pos += length; 662 } 663 } 664 665 if (pos != end) 666 return false; 667 } 668 669 return true; 670 } 671 EXPORT_SYMBOL_GPL(cfg80211_iter_rnr); 672 673 struct colocated_ap_data { 674 const struct element *ssid_elem; 675 struct list_head ap_list; 676 u32 s_ssid_tmp; 677 int n_coloc; 678 }; 679 680 static enum cfg80211_rnr_iter_ret 681 cfg80211_parse_colocated_ap_iter(void *_data, u8 type, 682 const struct ieee80211_neighbor_ap_info *info, 683 const u8 *tbtt_info, u8 tbtt_info_len) 684 { 685 struct colocated_ap_data *data = _data; 686 struct cfg80211_colocated_ap *entry; 687 enum nl80211_band band; 688 689 if (type != IEEE80211_TBTT_INFO_TYPE_TBTT) 690 return RNR_ITER_CONTINUE; 691 692 if (!ieee80211_operating_class_to_band(info->op_class, &band)) 693 return RNR_ITER_CONTINUE; 694 695 /* TBTT info must include bss param + BSSID + (short SSID or 696 * same_ssid bit to be set). Ignore other options, and move to 697 * the next AP info 698 */ 699 if (band != NL80211_BAND_6GHZ || 700 !(tbtt_info_len == offsetofend(struct ieee80211_tbtt_info_7_8_9, 701 bss_params) || 702 tbtt_info_len == sizeof(struct ieee80211_tbtt_info_7_8_9) || 703 tbtt_info_len >= offsetofend(struct ieee80211_tbtt_info_ge_11, 704 bss_params))) 705 return RNR_ITER_CONTINUE; 706 707 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, GFP_ATOMIC); 708 if (!entry) 709 return RNR_ITER_ERROR; 710 711 entry->center_freq = 712 ieee80211_channel_to_frequency(info->channel, band); 713 714 if (!cfg80211_parse_ap_info(entry, tbtt_info, tbtt_info_len, 715 data->ssid_elem, data->s_ssid_tmp)) { 716 data->n_coloc++; 717 list_add_tail(&entry->list, &data->ap_list); 718 } else { 719 kfree(entry); 720 } 721 722 return RNR_ITER_CONTINUE; 723 } 724 725 VISIBLE_IF_CFG80211_KUNIT int 726 cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies, 727 struct list_head *list) 728 { 729 struct colocated_ap_data data = {}; 730 int ret; 731 732 INIT_LIST_HEAD(&data.ap_list); 733 734 ret = cfg80211_calc_short_ssid(ies, &data.ssid_elem, &data.s_ssid_tmp); 735 if (ret) 736 return 0; 737 738 if (!cfg80211_iter_rnr(ies->data, ies->len, 739 cfg80211_parse_colocated_ap_iter, &data)) { 740 cfg80211_free_coloc_ap_list(&data.ap_list); 741 return 0; 742 } 743 744 list_splice_tail(&data.ap_list, list); 745 return data.n_coloc; 746 } 747 EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_parse_colocated_ap); 748 749 static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request, 750 struct ieee80211_channel *chan, 751 bool add_to_6ghz) 752 { 753 int i; 754 u32 n_channels = request->n_channels; 755 struct cfg80211_scan_6ghz_params *params = 756 &request->scan_6ghz_params[request->n_6ghz_params]; 757 758 for (i = 0; i < n_channels; i++) { 759 if (request->channels[i] == chan) { 760 if (add_to_6ghz) 761 params->channel_idx = i; 762 return; 763 } 764 } 765 766 request->channels[n_channels] = chan; 767 if (add_to_6ghz) 768 request->scan_6ghz_params[request->n_6ghz_params].channel_idx = 769 n_channels; 770 771 request->n_channels++; 772 } 773 774 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap, 775 struct cfg80211_scan_request *request) 776 { 777 int i; 778 u32 s_ssid; 779 780 for (i = 0; i < request->n_ssids; i++) { 781 /* wildcard ssid in the scan request */ 782 if (!request->ssids[i].ssid_len) { 783 if (ap->multi_bss && !ap->transmitted_bssid) 784 continue; 785 786 return true; 787 } 788 789 if (ap->ssid_len && 790 ap->ssid_len == request->ssids[i].ssid_len) { 791 if (!memcmp(request->ssids[i].ssid, ap->ssid, 792 ap->ssid_len)) 793 return true; 794 } else if (ap->short_ssid_valid) { 795 s_ssid = ~crc32_le(~0, request->ssids[i].ssid, 796 request->ssids[i].ssid_len); 797 798 if (ap->short_ssid == s_ssid) 799 return true; 800 } 801 } 802 803 return false; 804 } 805 806 static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev) 807 { 808 u8 i; 809 struct cfg80211_colocated_ap *ap; 810 int n_channels, count = 0, err; 811 struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req; 812 LIST_HEAD(coloc_ap_list); 813 bool need_scan_psc = true; 814 const struct ieee80211_sband_iftype_data *iftd; 815 size_t size, offs_ssids, offs_6ghz_params, offs_ies; 816 817 rdev_req->scan_6ghz = true; 818 819 if (!rdev->wiphy.bands[NL80211_BAND_6GHZ]) 820 return -EOPNOTSUPP; 821 822 iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ], 823 rdev_req->wdev->iftype); 824 if (!iftd || !iftd->he_cap.has_he) 825 return -EOPNOTSUPP; 826 827 n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels; 828 829 if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) { 830 struct cfg80211_internal_bss *intbss; 831 832 spin_lock_bh(&rdev->bss_lock); 833 list_for_each_entry(intbss, &rdev->bss_list, list) { 834 struct cfg80211_bss *res = &intbss->pub; 835 const struct cfg80211_bss_ies *ies; 836 const struct element *ssid_elem; 837 struct cfg80211_colocated_ap *entry; 838 u32 s_ssid_tmp; 839 int ret; 840 841 ies = rcu_access_pointer(res->ies); 842 count += cfg80211_parse_colocated_ap(ies, 843 &coloc_ap_list); 844 845 /* In case the scan request specified a specific BSSID 846 * and the BSS is found and operating on 6GHz band then 847 * add this AP to the collocated APs list. 848 * This is relevant for ML probe requests when the lower 849 * band APs have not been discovered. 850 */ 851 if (is_broadcast_ether_addr(rdev_req->bssid) || 852 !ether_addr_equal(rdev_req->bssid, res->bssid) || 853 res->channel->band != NL80211_BAND_6GHZ) 854 continue; 855 856 ret = cfg80211_calc_short_ssid(ies, &ssid_elem, 857 &s_ssid_tmp); 858 if (ret) 859 continue; 860 861 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN, 862 GFP_ATOMIC); 863 864 if (!entry) 865 continue; 866 867 memcpy(entry->bssid, res->bssid, ETH_ALEN); 868 entry->short_ssid = s_ssid_tmp; 869 memcpy(entry->ssid, ssid_elem->data, 870 ssid_elem->datalen); 871 entry->ssid_len = ssid_elem->datalen; 872 entry->short_ssid_valid = true; 873 entry->center_freq = res->channel->center_freq; 874 875 list_add_tail(&entry->list, &coloc_ap_list); 876 count++; 877 } 878 spin_unlock_bh(&rdev->bss_lock); 879 } 880 881 size = struct_size(request, channels, n_channels); 882 offs_ssids = size; 883 size += sizeof(*request->ssids) * rdev_req->n_ssids; 884 offs_6ghz_params = size; 885 size += sizeof(*request->scan_6ghz_params) * count; 886 offs_ies = size; 887 size += rdev_req->ie_len; 888 889 request = kzalloc(size, GFP_KERNEL); 890 if (!request) { 891 cfg80211_free_coloc_ap_list(&coloc_ap_list); 892 return -ENOMEM; 893 } 894 895 *request = *rdev_req; 896 request->n_channels = 0; 897 request->n_6ghz_params = 0; 898 if (rdev_req->n_ssids) { 899 /* 900 * Add the ssids from the parent scan request to the new 901 * scan request, so the driver would be able to use them 902 * in its probe requests to discover hidden APs on PSC 903 * channels. 904 */ 905 request->ssids = (void *)request + offs_ssids; 906 memcpy(request->ssids, rdev_req->ssids, 907 sizeof(*request->ssids) * request->n_ssids); 908 } 909 request->scan_6ghz_params = (void *)request + offs_6ghz_params; 910 911 if (rdev_req->ie_len) { 912 void *ie = (void *)request + offs_ies; 913 914 memcpy(ie, rdev_req->ie, rdev_req->ie_len); 915 request->ie = ie; 916 } 917 918 /* 919 * PSC channels should not be scanned in case of direct scan with 1 SSID 920 * and at least one of the reported co-located APs with same SSID 921 * indicating that all APs in the same ESS are co-located 922 */ 923 if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) { 924 list_for_each_entry(ap, &coloc_ap_list, list) { 925 if (ap->colocated_ess && 926 cfg80211_find_ssid_match(ap, request)) { 927 need_scan_psc = false; 928 break; 929 } 930 } 931 } 932 933 /* 934 * add to the scan request the channels that need to be scanned 935 * regardless of the collocated APs (PSC channels or all channels 936 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set) 937 */ 938 for (i = 0; i < rdev_req->n_channels; i++) { 939 if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ && 940 ((need_scan_psc && 941 cfg80211_channel_is_psc(rdev_req->channels[i])) || 942 !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) { 943 cfg80211_scan_req_add_chan(request, 944 rdev_req->channels[i], 945 false); 946 } 947 } 948 949 if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ)) 950 goto skip; 951 952 list_for_each_entry(ap, &coloc_ap_list, list) { 953 bool found = false; 954 struct cfg80211_scan_6ghz_params *scan_6ghz_params = 955 &request->scan_6ghz_params[request->n_6ghz_params]; 956 struct ieee80211_channel *chan = 957 ieee80211_get_channel(&rdev->wiphy, ap->center_freq); 958 959 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) 960 continue; 961 962 for (i = 0; i < rdev_req->n_channels; i++) { 963 if (rdev_req->channels[i] == chan) 964 found = true; 965 } 966 967 if (!found) 968 continue; 969 970 if (request->n_ssids > 0 && 971 !cfg80211_find_ssid_match(ap, request)) 972 continue; 973 974 if (!is_broadcast_ether_addr(request->bssid) && 975 !ether_addr_equal(request->bssid, ap->bssid)) 976 continue; 977 978 if (!request->n_ssids && ap->multi_bss && !ap->transmitted_bssid) 979 continue; 980 981 cfg80211_scan_req_add_chan(request, chan, true); 982 memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN); 983 scan_6ghz_params->short_ssid = ap->short_ssid; 984 scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid; 985 scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe; 986 scan_6ghz_params->psd_20 = ap->psd_20; 987 988 /* 989 * If a PSC channel is added to the scan and 'need_scan_psc' is 990 * set to false, then all the APs that the scan logic is 991 * interested with on the channel are collocated and thus there 992 * is no need to perform the initial PSC channel listen. 993 */ 994 if (cfg80211_channel_is_psc(chan) && !need_scan_psc) 995 scan_6ghz_params->psc_no_listen = true; 996 997 request->n_6ghz_params++; 998 } 999 1000 skip: 1001 cfg80211_free_coloc_ap_list(&coloc_ap_list); 1002 1003 if (request->n_channels) { 1004 struct cfg80211_scan_request *old = rdev->int_scan_req; 1005 1006 rdev->int_scan_req = request; 1007 1008 /* 1009 * If this scan follows a previous scan, save the scan start 1010 * info from the first part of the scan 1011 */ 1012 if (old) 1013 rdev->int_scan_req->info = old->info; 1014 1015 err = rdev_scan(rdev, request); 1016 if (err) { 1017 rdev->int_scan_req = old; 1018 kfree(request); 1019 } else { 1020 kfree(old); 1021 } 1022 1023 return err; 1024 } 1025 1026 kfree(request); 1027 return -EINVAL; 1028 } 1029 1030 int cfg80211_scan(struct cfg80211_registered_device *rdev) 1031 { 1032 struct cfg80211_scan_request *request; 1033 struct cfg80211_scan_request *rdev_req = rdev->scan_req; 1034 u32 n_channels = 0, idx, i; 1035 1036 if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ)) 1037 return rdev_scan(rdev, rdev_req); 1038 1039 for (i = 0; i < rdev_req->n_channels; i++) { 1040 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) 1041 n_channels++; 1042 } 1043 1044 if (!n_channels) 1045 return cfg80211_scan_6ghz(rdev); 1046 1047 request = kzalloc(struct_size(request, channels, n_channels), 1048 GFP_KERNEL); 1049 if (!request) 1050 return -ENOMEM; 1051 1052 *request = *rdev_req; 1053 request->n_channels = n_channels; 1054 1055 for (i = idx = 0; i < rdev_req->n_channels; i++) { 1056 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ) 1057 request->channels[idx++] = rdev_req->channels[i]; 1058 } 1059 1060 rdev_req->scan_6ghz = false; 1061 rdev->int_scan_req = request; 1062 return rdev_scan(rdev, request); 1063 } 1064 1065 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, 1066 bool send_message) 1067 { 1068 struct cfg80211_scan_request *request, *rdev_req; 1069 struct wireless_dev *wdev; 1070 struct sk_buff *msg; 1071 #ifdef CONFIG_CFG80211_WEXT 1072 union iwreq_data wrqu; 1073 #endif 1074 1075 lockdep_assert_held(&rdev->wiphy.mtx); 1076 1077 if (rdev->scan_msg) { 1078 nl80211_send_scan_msg(rdev, rdev->scan_msg); 1079 rdev->scan_msg = NULL; 1080 return; 1081 } 1082 1083 rdev_req = rdev->scan_req; 1084 if (!rdev_req) 1085 return; 1086 1087 wdev = rdev_req->wdev; 1088 request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req; 1089 1090 if (wdev_running(wdev) && 1091 (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) && 1092 !rdev_req->scan_6ghz && !request->info.aborted && 1093 !cfg80211_scan_6ghz(rdev)) 1094 return; 1095 1096 /* 1097 * This must be before sending the other events! 1098 * Otherwise, wpa_supplicant gets completely confused with 1099 * wext events. 1100 */ 1101 if (wdev->netdev) 1102 cfg80211_sme_scan_done(wdev->netdev); 1103 1104 if (!request->info.aborted && 1105 request->flags & NL80211_SCAN_FLAG_FLUSH) { 1106 /* flush entries from previous scans */ 1107 spin_lock_bh(&rdev->bss_lock); 1108 __cfg80211_bss_expire(rdev, request->scan_start); 1109 spin_unlock_bh(&rdev->bss_lock); 1110 } 1111 1112 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted); 1113 1114 #ifdef CONFIG_CFG80211_WEXT 1115 if (wdev->netdev && !request->info.aborted) { 1116 memset(&wrqu, 0, sizeof(wrqu)); 1117 1118 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL); 1119 } 1120 #endif 1121 1122 dev_put(wdev->netdev); 1123 1124 kfree(rdev->int_scan_req); 1125 rdev->int_scan_req = NULL; 1126 1127 kfree(rdev->scan_req); 1128 rdev->scan_req = NULL; 1129 1130 if (!send_message) 1131 rdev->scan_msg = msg; 1132 else 1133 nl80211_send_scan_msg(rdev, msg); 1134 } 1135 1136 void __cfg80211_scan_done(struct wiphy *wiphy, struct wiphy_work *wk) 1137 { 1138 ___cfg80211_scan_done(wiphy_to_rdev(wiphy), true); 1139 } 1140 1141 void cfg80211_scan_done(struct cfg80211_scan_request *request, 1142 struct cfg80211_scan_info *info) 1143 { 1144 struct cfg80211_scan_info old_info = request->info; 1145 1146 trace_cfg80211_scan_done(request, info); 1147 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req && 1148 request != wiphy_to_rdev(request->wiphy)->int_scan_req); 1149 1150 request->info = *info; 1151 1152 /* 1153 * In case the scan is split, the scan_start_tsf and tsf_bssid should 1154 * be of the first part. In such a case old_info.scan_start_tsf should 1155 * be non zero. 1156 */ 1157 if (request->scan_6ghz && old_info.scan_start_tsf) { 1158 request->info.scan_start_tsf = old_info.scan_start_tsf; 1159 memcpy(request->info.tsf_bssid, old_info.tsf_bssid, 1160 sizeof(request->info.tsf_bssid)); 1161 } 1162 1163 request->notified = true; 1164 wiphy_work_queue(request->wiphy, 1165 &wiphy_to_rdev(request->wiphy)->scan_done_wk); 1166 } 1167 EXPORT_SYMBOL(cfg80211_scan_done); 1168 1169 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev, 1170 struct cfg80211_sched_scan_request *req) 1171 { 1172 lockdep_assert_held(&rdev->wiphy.mtx); 1173 1174 list_add_rcu(&req->list, &rdev->sched_scan_req_list); 1175 } 1176 1177 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev, 1178 struct cfg80211_sched_scan_request *req) 1179 { 1180 lockdep_assert_held(&rdev->wiphy.mtx); 1181 1182 list_del_rcu(&req->list); 1183 kfree_rcu(req, rcu_head); 1184 } 1185 1186 static struct cfg80211_sched_scan_request * 1187 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid) 1188 { 1189 struct cfg80211_sched_scan_request *pos; 1190 1191 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list, 1192 lockdep_is_held(&rdev->wiphy.mtx)) { 1193 if (pos->reqid == reqid) 1194 return pos; 1195 } 1196 return NULL; 1197 } 1198 1199 /* 1200 * Determines if a scheduled scan request can be handled. When a legacy 1201 * scheduled scan is running no other scheduled scan is allowed regardless 1202 * whether the request is for legacy or multi-support scan. When a multi-support 1203 * scheduled scan is running a request for legacy scan is not allowed. In this 1204 * case a request for multi-support scan can be handled if resources are 1205 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached. 1206 */ 1207 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev, 1208 bool want_multi) 1209 { 1210 struct cfg80211_sched_scan_request *pos; 1211 int i = 0; 1212 1213 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) { 1214 /* request id zero means legacy in progress */ 1215 if (!i && !pos->reqid) 1216 return -EINPROGRESS; 1217 i++; 1218 } 1219 1220 if (i) { 1221 /* no legacy allowed when multi request(s) are active */ 1222 if (!want_multi) 1223 return -EINPROGRESS; 1224 1225 /* resource limit reached */ 1226 if (i == rdev->wiphy.max_sched_scan_reqs) 1227 return -ENOSPC; 1228 } 1229 return 0; 1230 } 1231 1232 void cfg80211_sched_scan_results_wk(struct work_struct *work) 1233 { 1234 struct cfg80211_registered_device *rdev; 1235 struct cfg80211_sched_scan_request *req, *tmp; 1236 1237 rdev = container_of(work, struct cfg80211_registered_device, 1238 sched_scan_res_wk); 1239 1240 wiphy_lock(&rdev->wiphy); 1241 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) { 1242 if (req->report_results) { 1243 req->report_results = false; 1244 if (req->flags & NL80211_SCAN_FLAG_FLUSH) { 1245 /* flush entries from previous scans */ 1246 spin_lock_bh(&rdev->bss_lock); 1247 __cfg80211_bss_expire(rdev, req->scan_start); 1248 spin_unlock_bh(&rdev->bss_lock); 1249 req->scan_start = jiffies; 1250 } 1251 nl80211_send_sched_scan(req, 1252 NL80211_CMD_SCHED_SCAN_RESULTS); 1253 } 1254 } 1255 wiphy_unlock(&rdev->wiphy); 1256 } 1257 1258 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid) 1259 { 1260 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1261 struct cfg80211_sched_scan_request *request; 1262 1263 trace_cfg80211_sched_scan_results(wiphy, reqid); 1264 /* ignore if we're not scanning */ 1265 1266 rcu_read_lock(); 1267 request = cfg80211_find_sched_scan_req(rdev, reqid); 1268 if (request) { 1269 request->report_results = true; 1270 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk); 1271 } 1272 rcu_read_unlock(); 1273 } 1274 EXPORT_SYMBOL(cfg80211_sched_scan_results); 1275 1276 void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid) 1277 { 1278 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1279 1280 lockdep_assert_held(&wiphy->mtx); 1281 1282 trace_cfg80211_sched_scan_stopped(wiphy, reqid); 1283 1284 __cfg80211_stop_sched_scan(rdev, reqid, true); 1285 } 1286 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked); 1287 1288 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid) 1289 { 1290 wiphy_lock(wiphy); 1291 cfg80211_sched_scan_stopped_locked(wiphy, reqid); 1292 wiphy_unlock(wiphy); 1293 } 1294 EXPORT_SYMBOL(cfg80211_sched_scan_stopped); 1295 1296 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev, 1297 struct cfg80211_sched_scan_request *req, 1298 bool driver_initiated) 1299 { 1300 lockdep_assert_held(&rdev->wiphy.mtx); 1301 1302 if (!driver_initiated) { 1303 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid); 1304 if (err) 1305 return err; 1306 } 1307 1308 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED); 1309 1310 cfg80211_del_sched_scan_req(rdev, req); 1311 1312 return 0; 1313 } 1314 1315 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev, 1316 u64 reqid, bool driver_initiated) 1317 { 1318 struct cfg80211_sched_scan_request *sched_scan_req; 1319 1320 lockdep_assert_held(&rdev->wiphy.mtx); 1321 1322 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid); 1323 if (!sched_scan_req) 1324 return -ENOENT; 1325 1326 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req, 1327 driver_initiated); 1328 } 1329 1330 void cfg80211_bss_age(struct cfg80211_registered_device *rdev, 1331 unsigned long age_secs) 1332 { 1333 struct cfg80211_internal_bss *bss; 1334 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC); 1335 1336 spin_lock_bh(&rdev->bss_lock); 1337 list_for_each_entry(bss, &rdev->bss_list, list) 1338 bss->ts -= age_jiffies; 1339 spin_unlock_bh(&rdev->bss_lock); 1340 } 1341 1342 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) 1343 { 1344 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); 1345 } 1346 1347 void cfg80211_bss_flush(struct wiphy *wiphy) 1348 { 1349 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1350 1351 spin_lock_bh(&rdev->bss_lock); 1352 __cfg80211_bss_expire(rdev, jiffies); 1353 spin_unlock_bh(&rdev->bss_lock); 1354 } 1355 EXPORT_SYMBOL(cfg80211_bss_flush); 1356 1357 const struct element * 1358 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len, 1359 const u8 *match, unsigned int match_len, 1360 unsigned int match_offset) 1361 { 1362 const struct element *elem; 1363 1364 for_each_element_id(elem, eid, ies, len) { 1365 if (elem->datalen >= match_offset + match_len && 1366 !memcmp(elem->data + match_offset, match, match_len)) 1367 return elem; 1368 } 1369 1370 return NULL; 1371 } 1372 EXPORT_SYMBOL(cfg80211_find_elem_match); 1373 1374 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type, 1375 const u8 *ies, 1376 unsigned int len) 1377 { 1378 const struct element *elem; 1379 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type }; 1380 int match_len = (oui_type < 0) ? 3 : sizeof(match); 1381 1382 if (WARN_ON(oui_type > 0xff)) 1383 return NULL; 1384 1385 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len, 1386 match, match_len, 0); 1387 1388 if (!elem || elem->datalen < 4) 1389 return NULL; 1390 1391 return elem; 1392 } 1393 EXPORT_SYMBOL(cfg80211_find_vendor_elem); 1394 1395 /** 1396 * enum bss_compare_mode - BSS compare mode 1397 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find) 1398 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode 1399 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode 1400 */ 1401 enum bss_compare_mode { 1402 BSS_CMP_REGULAR, 1403 BSS_CMP_HIDE_ZLEN, 1404 BSS_CMP_HIDE_NUL, 1405 }; 1406 1407 static int cmp_bss(struct cfg80211_bss *a, 1408 struct cfg80211_bss *b, 1409 enum bss_compare_mode mode) 1410 { 1411 const struct cfg80211_bss_ies *a_ies, *b_ies; 1412 const u8 *ie1 = NULL; 1413 const u8 *ie2 = NULL; 1414 int i, r; 1415 1416 if (a->channel != b->channel) 1417 return (b->channel->center_freq * 1000 + b->channel->freq_offset) - 1418 (a->channel->center_freq * 1000 + a->channel->freq_offset); 1419 1420 a_ies = rcu_access_pointer(a->ies); 1421 if (!a_ies) 1422 return -1; 1423 b_ies = rcu_access_pointer(b->ies); 1424 if (!b_ies) 1425 return 1; 1426 1427 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability)) 1428 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID, 1429 a_ies->data, a_ies->len); 1430 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability)) 1431 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID, 1432 b_ies->data, b_ies->len); 1433 if (ie1 && ie2) { 1434 int mesh_id_cmp; 1435 1436 if (ie1[1] == ie2[1]) 1437 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]); 1438 else 1439 mesh_id_cmp = ie2[1] - ie1[1]; 1440 1441 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 1442 a_ies->data, a_ies->len); 1443 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, 1444 b_ies->data, b_ies->len); 1445 if (ie1 && ie2) { 1446 if (mesh_id_cmp) 1447 return mesh_id_cmp; 1448 if (ie1[1] != ie2[1]) 1449 return ie2[1] - ie1[1]; 1450 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 1451 } 1452 } 1453 1454 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid)); 1455 if (r) 1456 return r; 1457 1458 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len); 1459 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len); 1460 1461 if (!ie1 && !ie2) 1462 return 0; 1463 1464 /* 1465 * Note that with "hide_ssid", the function returns a match if 1466 * the already-present BSS ("b") is a hidden SSID beacon for 1467 * the new BSS ("a"). 1468 */ 1469 1470 /* sort missing IE before (left of) present IE */ 1471 if (!ie1) 1472 return -1; 1473 if (!ie2) 1474 return 1; 1475 1476 switch (mode) { 1477 case BSS_CMP_HIDE_ZLEN: 1478 /* 1479 * In ZLEN mode we assume the BSS entry we're 1480 * looking for has a zero-length SSID. So if 1481 * the one we're looking at right now has that, 1482 * return 0. Otherwise, return the difference 1483 * in length, but since we're looking for the 1484 * 0-length it's really equivalent to returning 1485 * the length of the one we're looking at. 1486 * 1487 * No content comparison is needed as we assume 1488 * the content length is zero. 1489 */ 1490 return ie2[1]; 1491 case BSS_CMP_REGULAR: 1492 default: 1493 /* sort by length first, then by contents */ 1494 if (ie1[1] != ie2[1]) 1495 return ie2[1] - ie1[1]; 1496 return memcmp(ie1 + 2, ie2 + 2, ie1[1]); 1497 case BSS_CMP_HIDE_NUL: 1498 if (ie1[1] != ie2[1]) 1499 return ie2[1] - ie1[1]; 1500 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */ 1501 for (i = 0; i < ie2[1]; i++) 1502 if (ie2[i + 2]) 1503 return -1; 1504 return 0; 1505 } 1506 } 1507 1508 static bool cfg80211_bss_type_match(u16 capability, 1509 enum nl80211_band band, 1510 enum ieee80211_bss_type bss_type) 1511 { 1512 bool ret = true; 1513 u16 mask, val; 1514 1515 if (bss_type == IEEE80211_BSS_TYPE_ANY) 1516 return ret; 1517 1518 if (band == NL80211_BAND_60GHZ) { 1519 mask = WLAN_CAPABILITY_DMG_TYPE_MASK; 1520 switch (bss_type) { 1521 case IEEE80211_BSS_TYPE_ESS: 1522 val = WLAN_CAPABILITY_DMG_TYPE_AP; 1523 break; 1524 case IEEE80211_BSS_TYPE_PBSS: 1525 val = WLAN_CAPABILITY_DMG_TYPE_PBSS; 1526 break; 1527 case IEEE80211_BSS_TYPE_IBSS: 1528 val = WLAN_CAPABILITY_DMG_TYPE_IBSS; 1529 break; 1530 default: 1531 return false; 1532 } 1533 } else { 1534 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS; 1535 switch (bss_type) { 1536 case IEEE80211_BSS_TYPE_ESS: 1537 val = WLAN_CAPABILITY_ESS; 1538 break; 1539 case IEEE80211_BSS_TYPE_IBSS: 1540 val = WLAN_CAPABILITY_IBSS; 1541 break; 1542 case IEEE80211_BSS_TYPE_MBSS: 1543 val = 0; 1544 break; 1545 default: 1546 return false; 1547 } 1548 } 1549 1550 ret = ((capability & mask) == val); 1551 return ret; 1552 } 1553 1554 /* Returned bss is reference counted and must be cleaned up appropriately. */ 1555 struct cfg80211_bss *__cfg80211_get_bss(struct wiphy *wiphy, 1556 struct ieee80211_channel *channel, 1557 const u8 *bssid, 1558 const u8 *ssid, size_t ssid_len, 1559 enum ieee80211_bss_type bss_type, 1560 enum ieee80211_privacy privacy, 1561 u32 use_for) 1562 { 1563 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 1564 struct cfg80211_internal_bss *bss, *res = NULL; 1565 unsigned long now = jiffies; 1566 int bss_privacy; 1567 1568 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type, 1569 privacy); 1570 1571 spin_lock_bh(&rdev->bss_lock); 1572 1573 list_for_each_entry(bss, &rdev->bss_list, list) { 1574 if (!cfg80211_bss_type_match(bss->pub.capability, 1575 bss->pub.channel->band, bss_type)) 1576 continue; 1577 1578 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY); 1579 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) || 1580 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy)) 1581 continue; 1582 if (channel && bss->pub.channel != channel) 1583 continue; 1584 if (!is_valid_ether_addr(bss->pub.bssid)) 1585 continue; 1586 if ((bss->pub.use_for & use_for) != use_for) 1587 continue; 1588 /* Don't get expired BSS structs */ 1589 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) && 1590 !atomic_read(&bss->hold)) 1591 continue; 1592 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) { 1593 res = bss; 1594 bss_ref_get(rdev, res); 1595 break; 1596 } 1597 } 1598 1599 spin_unlock_bh(&rdev->bss_lock); 1600 if (!res) 1601 return NULL; 1602 trace_cfg80211_return_bss(&res->pub); 1603 return &res->pub; 1604 } 1605 EXPORT_SYMBOL(__cfg80211_get_bss); 1606 1607 static void rb_insert_bss(struct cfg80211_registered_device *rdev, 1608 struct cfg80211_internal_bss *bss) 1609 { 1610 struct rb_node **p = &rdev->bss_tree.rb_node; 1611 struct rb_node *parent = NULL; 1612 struct cfg80211_internal_bss *tbss; 1613 int cmp; 1614 1615 while (*p) { 1616 parent = *p; 1617 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn); 1618 1619 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR); 1620 1621 if (WARN_ON(!cmp)) { 1622 /* will sort of leak this BSS */ 1623 return; 1624 } 1625 1626 if (cmp < 0) 1627 p = &(*p)->rb_left; 1628 else 1629 p = &(*p)->rb_right; 1630 } 1631 1632 rb_link_node(&bss->rbn, parent, p); 1633 rb_insert_color(&bss->rbn, &rdev->bss_tree); 1634 } 1635 1636 static struct cfg80211_internal_bss * 1637 rb_find_bss(struct cfg80211_registered_device *rdev, 1638 struct cfg80211_internal_bss *res, 1639 enum bss_compare_mode mode) 1640 { 1641 struct rb_node *n = rdev->bss_tree.rb_node; 1642 struct cfg80211_internal_bss *bss; 1643 int r; 1644 1645 while (n) { 1646 bss = rb_entry(n, struct cfg80211_internal_bss, rbn); 1647 r = cmp_bss(&res->pub, &bss->pub, mode); 1648 1649 if (r == 0) 1650 return bss; 1651 else if (r < 0) 1652 n = n->rb_left; 1653 else 1654 n = n->rb_right; 1655 } 1656 1657 return NULL; 1658 } 1659 1660 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev, 1661 struct cfg80211_internal_bss *new) 1662 { 1663 const struct cfg80211_bss_ies *ies; 1664 struct cfg80211_internal_bss *bss; 1665 const u8 *ie; 1666 int i, ssidlen; 1667 u8 fold = 0; 1668 u32 n_entries = 0; 1669 1670 ies = rcu_access_pointer(new->pub.beacon_ies); 1671 if (WARN_ON(!ies)) 1672 return false; 1673 1674 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 1675 if (!ie) { 1676 /* nothing to do */ 1677 return true; 1678 } 1679 1680 ssidlen = ie[1]; 1681 for (i = 0; i < ssidlen; i++) 1682 fold |= ie[2 + i]; 1683 1684 if (fold) { 1685 /* not a hidden SSID */ 1686 return true; 1687 } 1688 1689 /* This is the bad part ... */ 1690 1691 list_for_each_entry(bss, &rdev->bss_list, list) { 1692 /* 1693 * we're iterating all the entries anyway, so take the 1694 * opportunity to validate the list length accounting 1695 */ 1696 n_entries++; 1697 1698 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid)) 1699 continue; 1700 if (bss->pub.channel != new->pub.channel) 1701 continue; 1702 if (rcu_access_pointer(bss->pub.beacon_ies)) 1703 continue; 1704 ies = rcu_access_pointer(bss->pub.ies); 1705 if (!ies) 1706 continue; 1707 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len); 1708 if (!ie) 1709 continue; 1710 if (ssidlen && ie[1] != ssidlen) 1711 continue; 1712 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss)) 1713 continue; 1714 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list))) 1715 list_del(&bss->hidden_list); 1716 /* combine them */ 1717 list_add(&bss->hidden_list, &new->hidden_list); 1718 bss->pub.hidden_beacon_bss = &new->pub; 1719 new->refcount += bss->refcount; 1720 rcu_assign_pointer(bss->pub.beacon_ies, 1721 new->pub.beacon_ies); 1722 } 1723 1724 WARN_ONCE(n_entries != rdev->bss_entries, 1725 "rdev bss entries[%d]/list[len:%d] corruption\n", 1726 rdev->bss_entries, n_entries); 1727 1728 return true; 1729 } 1730 1731 static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known, 1732 const struct cfg80211_bss_ies *new_ies, 1733 const struct cfg80211_bss_ies *old_ies) 1734 { 1735 struct cfg80211_internal_bss *bss; 1736 1737 /* Assign beacon IEs to all sub entries */ 1738 list_for_each_entry(bss, &known->hidden_list, hidden_list) { 1739 const struct cfg80211_bss_ies *ies; 1740 1741 ies = rcu_access_pointer(bss->pub.beacon_ies); 1742 WARN_ON(ies != old_ies); 1743 1744 rcu_assign_pointer(bss->pub.beacon_ies, new_ies); 1745 } 1746 } 1747 1748 static void cfg80211_check_stuck_ecsa(struct cfg80211_registered_device *rdev, 1749 struct cfg80211_internal_bss *known, 1750 const struct cfg80211_bss_ies *old) 1751 { 1752 const struct ieee80211_ext_chansw_ie *ecsa; 1753 const struct element *elem_new, *elem_old; 1754 const struct cfg80211_bss_ies *new, *bcn; 1755 1756 if (known->pub.proberesp_ecsa_stuck) 1757 return; 1758 1759 new = rcu_dereference_protected(known->pub.proberesp_ies, 1760 lockdep_is_held(&rdev->bss_lock)); 1761 if (WARN_ON(!new)) 1762 return; 1763 1764 if (new->tsf - old->tsf < USEC_PER_SEC) 1765 return; 1766 1767 elem_old = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN, 1768 old->data, old->len); 1769 if (!elem_old) 1770 return; 1771 1772 elem_new = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN, 1773 new->data, new->len); 1774 if (!elem_new) 1775 return; 1776 1777 bcn = rcu_dereference_protected(known->pub.beacon_ies, 1778 lockdep_is_held(&rdev->bss_lock)); 1779 if (bcn && 1780 cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN, 1781 bcn->data, bcn->len)) 1782 return; 1783 1784 if (elem_new->datalen != elem_old->datalen) 1785 return; 1786 if (elem_new->datalen < sizeof(struct ieee80211_ext_chansw_ie)) 1787 return; 1788 if (memcmp(elem_new->data, elem_old->data, elem_new->datalen)) 1789 return; 1790 1791 ecsa = (void *)elem_new->data; 1792 1793 if (!ecsa->mode) 1794 return; 1795 1796 if (ecsa->new_ch_num != 1797 ieee80211_frequency_to_channel(known->pub.channel->center_freq)) 1798 return; 1799 1800 known->pub.proberesp_ecsa_stuck = 1; 1801 } 1802 1803 static bool 1804 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev, 1805 struct cfg80211_internal_bss *known, 1806 struct cfg80211_internal_bss *new, 1807 bool signal_valid) 1808 { 1809 lockdep_assert_held(&rdev->bss_lock); 1810 1811 /* Update IEs */ 1812 if (rcu_access_pointer(new->pub.proberesp_ies)) { 1813 const struct cfg80211_bss_ies *old; 1814 1815 old = rcu_access_pointer(known->pub.proberesp_ies); 1816 1817 rcu_assign_pointer(known->pub.proberesp_ies, 1818 new->pub.proberesp_ies); 1819 /* Override possible earlier Beacon frame IEs */ 1820 rcu_assign_pointer(known->pub.ies, 1821 new->pub.proberesp_ies); 1822 if (old) { 1823 cfg80211_check_stuck_ecsa(rdev, known, old); 1824 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); 1825 } 1826 } 1827 1828 if (rcu_access_pointer(new->pub.beacon_ies)) { 1829 const struct cfg80211_bss_ies *old; 1830 1831 if (known->pub.hidden_beacon_bss && 1832 !list_empty(&known->hidden_list)) { 1833 const struct cfg80211_bss_ies *f; 1834 1835 /* The known BSS struct is one of the probe 1836 * response members of a group, but we're 1837 * receiving a beacon (beacon_ies in the new 1838 * bss is used). This can only mean that the 1839 * AP changed its beacon from not having an 1840 * SSID to showing it, which is confusing so 1841 * drop this information. 1842 */ 1843 1844 f = rcu_access_pointer(new->pub.beacon_ies); 1845 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head); 1846 return false; 1847 } 1848 1849 old = rcu_access_pointer(known->pub.beacon_ies); 1850 1851 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies); 1852 1853 /* Override IEs if they were from a beacon before */ 1854 if (old == rcu_access_pointer(known->pub.ies)) 1855 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies); 1856 1857 cfg80211_update_hidden_bsses(known, 1858 rcu_access_pointer(new->pub.beacon_ies), 1859 old); 1860 1861 if (old) 1862 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head); 1863 } 1864 1865 known->pub.beacon_interval = new->pub.beacon_interval; 1866 1867 /* don't update the signal if beacon was heard on 1868 * adjacent channel. 1869 */ 1870 if (signal_valid) 1871 known->pub.signal = new->pub.signal; 1872 known->pub.capability = new->pub.capability; 1873 known->ts = new->ts; 1874 known->ts_boottime = new->ts_boottime; 1875 known->parent_tsf = new->parent_tsf; 1876 known->pub.chains = new->pub.chains; 1877 memcpy(known->pub.chain_signal, new->pub.chain_signal, 1878 IEEE80211_MAX_CHAINS); 1879 ether_addr_copy(known->parent_bssid, new->parent_bssid); 1880 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator; 1881 known->pub.bssid_index = new->pub.bssid_index; 1882 known->pub.use_for &= new->pub.use_for; 1883 known->pub.cannot_use_reasons = new->pub.cannot_use_reasons; 1884 1885 return true; 1886 } 1887 1888 /* Returned bss is reference counted and must be cleaned up appropriately. */ 1889 static struct cfg80211_internal_bss * 1890 __cfg80211_bss_update(struct cfg80211_registered_device *rdev, 1891 struct cfg80211_internal_bss *tmp, 1892 bool signal_valid, unsigned long ts) 1893 { 1894 struct cfg80211_internal_bss *found = NULL; 1895 struct cfg80211_bss_ies *ies; 1896 1897 if (WARN_ON(!tmp->pub.channel)) 1898 goto free_ies; 1899 1900 tmp->ts = ts; 1901 1902 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) 1903 goto free_ies; 1904 1905 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR); 1906 1907 if (found) { 1908 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid)) 1909 return NULL; 1910 } else { 1911 struct cfg80211_internal_bss *new; 1912 struct cfg80211_internal_bss *hidden; 1913 1914 /* 1915 * create a copy -- the "res" variable that is passed in 1916 * is allocated on the stack since it's not needed in the 1917 * more common case of an update 1918 */ 1919 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size, 1920 GFP_ATOMIC); 1921 if (!new) 1922 goto free_ies; 1923 memcpy(new, tmp, sizeof(*new)); 1924 new->refcount = 1; 1925 INIT_LIST_HEAD(&new->hidden_list); 1926 INIT_LIST_HEAD(&new->pub.nontrans_list); 1927 /* we'll set this later if it was non-NULL */ 1928 new->pub.transmitted_bss = NULL; 1929 1930 if (rcu_access_pointer(tmp->pub.proberesp_ies)) { 1931 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN); 1932 if (!hidden) 1933 hidden = rb_find_bss(rdev, tmp, 1934 BSS_CMP_HIDE_NUL); 1935 if (hidden) { 1936 new->pub.hidden_beacon_bss = &hidden->pub; 1937 list_add(&new->hidden_list, 1938 &hidden->hidden_list); 1939 hidden->refcount++; 1940 1941 ies = (void *)rcu_access_pointer(new->pub.beacon_ies); 1942 rcu_assign_pointer(new->pub.beacon_ies, 1943 hidden->pub.beacon_ies); 1944 if (ies) 1945 kfree_rcu(ies, rcu_head); 1946 } 1947 } else { 1948 /* 1949 * Ok so we found a beacon, and don't have an entry. If 1950 * it's a beacon with hidden SSID, we might be in for an 1951 * expensive search for any probe responses that should 1952 * be grouped with this beacon for updates ... 1953 */ 1954 if (!cfg80211_combine_bsses(rdev, new)) { 1955 bss_ref_put(rdev, new); 1956 return NULL; 1957 } 1958 } 1959 1960 if (rdev->bss_entries >= bss_entries_limit && 1961 !cfg80211_bss_expire_oldest(rdev)) { 1962 bss_ref_put(rdev, new); 1963 return NULL; 1964 } 1965 1966 /* This must be before the call to bss_ref_get */ 1967 if (tmp->pub.transmitted_bss) { 1968 new->pub.transmitted_bss = tmp->pub.transmitted_bss; 1969 bss_ref_get(rdev, bss_from_pub(tmp->pub.transmitted_bss)); 1970 } 1971 1972 list_add_tail(&new->list, &rdev->bss_list); 1973 rdev->bss_entries++; 1974 rb_insert_bss(rdev, new); 1975 found = new; 1976 } 1977 1978 rdev->bss_generation++; 1979 bss_ref_get(rdev, found); 1980 1981 return found; 1982 1983 free_ies: 1984 ies = (void *)rcu_dereference(tmp->pub.beacon_ies); 1985 if (ies) 1986 kfree_rcu(ies, rcu_head); 1987 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies); 1988 if (ies) 1989 kfree_rcu(ies, rcu_head); 1990 1991 return NULL; 1992 } 1993 1994 struct cfg80211_internal_bss * 1995 cfg80211_bss_update(struct cfg80211_registered_device *rdev, 1996 struct cfg80211_internal_bss *tmp, 1997 bool signal_valid, unsigned long ts) 1998 { 1999 struct cfg80211_internal_bss *res; 2000 2001 spin_lock_bh(&rdev->bss_lock); 2002 res = __cfg80211_bss_update(rdev, tmp, signal_valid, ts); 2003 spin_unlock_bh(&rdev->bss_lock); 2004 2005 return res; 2006 } 2007 2008 int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen, 2009 enum nl80211_band band) 2010 { 2011 const struct element *tmp; 2012 2013 if (band == NL80211_BAND_6GHZ) { 2014 struct ieee80211_he_operation *he_oper; 2015 2016 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, 2017 ielen); 2018 if (tmp && tmp->datalen >= sizeof(*he_oper) && 2019 tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) { 2020 const struct ieee80211_he_6ghz_oper *he_6ghz_oper; 2021 2022 he_oper = (void *)&tmp->data[1]; 2023 2024 he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper); 2025 if (!he_6ghz_oper) 2026 return -1; 2027 2028 return he_6ghz_oper->primary; 2029 } 2030 } else if (band == NL80211_BAND_S1GHZ) { 2031 tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen); 2032 if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) { 2033 struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data; 2034 2035 return s1gop->oper_ch; 2036 } 2037 } else { 2038 tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen); 2039 if (tmp && tmp->datalen == 1) 2040 return tmp->data[0]; 2041 2042 tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen); 2043 if (tmp && 2044 tmp->datalen >= sizeof(struct ieee80211_ht_operation)) { 2045 struct ieee80211_ht_operation *htop = (void *)tmp->data; 2046 2047 return htop->primary_chan; 2048 } 2049 } 2050 2051 return -1; 2052 } 2053 EXPORT_SYMBOL(cfg80211_get_ies_channel_number); 2054 2055 /* 2056 * Update RX channel information based on the available frame payload 2057 * information. This is mainly for the 2.4 GHz band where frames can be received 2058 * from neighboring channels and the Beacon frames use the DSSS Parameter Set 2059 * element to indicate the current (transmitting) channel, but this might also 2060 * be needed on other bands if RX frequency does not match with the actual 2061 * operating channel of a BSS, or if the AP reports a different primary channel. 2062 */ 2063 static struct ieee80211_channel * 2064 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen, 2065 struct ieee80211_channel *channel) 2066 { 2067 u32 freq; 2068 int channel_number; 2069 struct ieee80211_channel *alt_channel; 2070 2071 channel_number = cfg80211_get_ies_channel_number(ie, ielen, 2072 channel->band); 2073 2074 if (channel_number < 0) { 2075 /* No channel information in frame payload */ 2076 return channel; 2077 } 2078 2079 freq = ieee80211_channel_to_freq_khz(channel_number, channel->band); 2080 2081 /* 2082 * Frame info (beacon/prob res) is the same as received channel, 2083 * no need for further processing. 2084 */ 2085 if (freq == ieee80211_channel_to_khz(channel)) 2086 return channel; 2087 2088 alt_channel = ieee80211_get_channel_khz(wiphy, freq); 2089 if (!alt_channel) { 2090 if (channel->band == NL80211_BAND_2GHZ || 2091 channel->band == NL80211_BAND_6GHZ) { 2092 /* 2093 * Better not allow unexpected channels when that could 2094 * be going beyond the 1-11 range (e.g., discovering 2095 * BSS on channel 12 when radio is configured for 2096 * channel 11) or beyond the 6 GHz channel range. 2097 */ 2098 return NULL; 2099 } 2100 2101 /* No match for the payload channel number - ignore it */ 2102 return channel; 2103 } 2104 2105 /* 2106 * Use the channel determined through the payload channel number 2107 * instead of the RX channel reported by the driver. 2108 */ 2109 if (alt_channel->flags & IEEE80211_CHAN_DISABLED) 2110 return NULL; 2111 return alt_channel; 2112 } 2113 2114 struct cfg80211_inform_single_bss_data { 2115 struct cfg80211_inform_bss *drv_data; 2116 enum cfg80211_bss_frame_type ftype; 2117 struct ieee80211_channel *channel; 2118 u8 bssid[ETH_ALEN]; 2119 u64 tsf; 2120 u16 capability; 2121 u16 beacon_interval; 2122 const u8 *ie; 2123 size_t ielen; 2124 2125 enum { 2126 BSS_SOURCE_DIRECT = 0, 2127 BSS_SOURCE_MBSSID, 2128 BSS_SOURCE_STA_PROFILE, 2129 } bss_source; 2130 /* Set if reporting bss_source != BSS_SOURCE_DIRECT */ 2131 struct cfg80211_bss *source_bss; 2132 u8 max_bssid_indicator; 2133 u8 bssid_index; 2134 2135 u8 use_for; 2136 u64 cannot_use_reasons; 2137 }; 2138 2139 static bool cfg80211_6ghz_power_type_valid(const u8 *ie, size_t ielen, 2140 const u32 flags) 2141 { 2142 const struct element *tmp; 2143 struct ieee80211_he_operation *he_oper; 2144 2145 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ielen); 2146 if (tmp && tmp->datalen >= sizeof(*he_oper) + 1 && 2147 tmp->datalen >= ieee80211_he_oper_size(tmp->data + 1)) { 2148 const struct ieee80211_he_6ghz_oper *he_6ghz_oper; 2149 2150 he_oper = (void *)&tmp->data[1]; 2151 he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper); 2152 2153 if (!he_6ghz_oper) 2154 return false; 2155 2156 switch (u8_get_bits(he_6ghz_oper->control, 2157 IEEE80211_HE_6GHZ_OPER_CTRL_REG_INFO)) { 2158 case IEEE80211_6GHZ_CTRL_REG_LPI_AP: 2159 case IEEE80211_6GHZ_CTRL_REG_INDOOR_LPI_AP: 2160 return true; 2161 case IEEE80211_6GHZ_CTRL_REG_SP_AP: 2162 case IEEE80211_6GHZ_CTRL_REG_INDOOR_SP_AP: 2163 return !(flags & IEEE80211_CHAN_NO_6GHZ_AFC_CLIENT); 2164 case IEEE80211_6GHZ_CTRL_REG_VLP_AP: 2165 return !(flags & IEEE80211_CHAN_NO_6GHZ_VLP_CLIENT); 2166 default: 2167 return false; 2168 } 2169 } 2170 return false; 2171 } 2172 2173 /* Returned bss is reference counted and must be cleaned up appropriately. */ 2174 static struct cfg80211_bss * 2175 cfg80211_inform_single_bss_data(struct wiphy *wiphy, 2176 struct cfg80211_inform_single_bss_data *data, 2177 gfp_t gfp) 2178 { 2179 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 2180 struct cfg80211_inform_bss *drv_data = data->drv_data; 2181 struct cfg80211_bss_ies *ies; 2182 struct ieee80211_channel *channel; 2183 struct cfg80211_internal_bss tmp = {}, *res; 2184 int bss_type; 2185 bool signal_valid; 2186 unsigned long ts; 2187 2188 if (WARN_ON(!wiphy)) 2189 return NULL; 2190 2191 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC && 2192 (drv_data->signal < 0 || drv_data->signal > 100))) 2193 return NULL; 2194 2195 if (WARN_ON(data->bss_source != BSS_SOURCE_DIRECT && !data->source_bss)) 2196 return NULL; 2197 2198 channel = data->channel; 2199 if (!channel) 2200 channel = cfg80211_get_bss_channel(wiphy, data->ie, data->ielen, 2201 drv_data->chan); 2202 if (!channel) 2203 return NULL; 2204 2205 if (channel->band == NL80211_BAND_6GHZ && 2206 !cfg80211_6ghz_power_type_valid(data->ie, data->ielen, 2207 channel->flags)) { 2208 data->use_for = 0; 2209 data->cannot_use_reasons = 2210 NL80211_BSS_CANNOT_USE_6GHZ_PWR_MISMATCH; 2211 } 2212 2213 memcpy(tmp.pub.bssid, data->bssid, ETH_ALEN); 2214 tmp.pub.channel = channel; 2215 if (data->bss_source != BSS_SOURCE_STA_PROFILE) 2216 tmp.pub.signal = drv_data->signal; 2217 else 2218 tmp.pub.signal = 0; 2219 tmp.pub.beacon_interval = data->beacon_interval; 2220 tmp.pub.capability = data->capability; 2221 tmp.ts_boottime = drv_data->boottime_ns; 2222 tmp.parent_tsf = drv_data->parent_tsf; 2223 ether_addr_copy(tmp.parent_bssid, drv_data->parent_bssid); 2224 tmp.pub.chains = drv_data->chains; 2225 memcpy(tmp.pub.chain_signal, drv_data->chain_signal, 2226 IEEE80211_MAX_CHAINS); 2227 tmp.pub.use_for = data->use_for; 2228 tmp.pub.cannot_use_reasons = data->cannot_use_reasons; 2229 2230 switch (data->bss_source) { 2231 case BSS_SOURCE_MBSSID: 2232 tmp.pub.transmitted_bss = data->source_bss; 2233 fallthrough; 2234 case BSS_SOURCE_STA_PROFILE: 2235 ts = bss_from_pub(data->source_bss)->ts; 2236 tmp.pub.bssid_index = data->bssid_index; 2237 tmp.pub.max_bssid_indicator = data->max_bssid_indicator; 2238 break; 2239 case BSS_SOURCE_DIRECT: 2240 ts = jiffies; 2241 2242 if (channel->band == NL80211_BAND_60GHZ) { 2243 bss_type = data->capability & 2244 WLAN_CAPABILITY_DMG_TYPE_MASK; 2245 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP || 2246 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS) 2247 regulatory_hint_found_beacon(wiphy, channel, 2248 gfp); 2249 } else { 2250 if (data->capability & WLAN_CAPABILITY_ESS) 2251 regulatory_hint_found_beacon(wiphy, channel, 2252 gfp); 2253 } 2254 break; 2255 } 2256 2257 /* 2258 * If we do not know here whether the IEs are from a Beacon or Probe 2259 * Response frame, we need to pick one of the options and only use it 2260 * with the driver that does not provide the full Beacon/Probe Response 2261 * frame. Use Beacon frame pointer to avoid indicating that this should 2262 * override the IEs pointer should we have received an earlier 2263 * indication of Probe Response data. 2264 */ 2265 ies = kzalloc(sizeof(*ies) + data->ielen, gfp); 2266 if (!ies) 2267 return NULL; 2268 ies->len = data->ielen; 2269 ies->tsf = data->tsf; 2270 ies->from_beacon = false; 2271 memcpy(ies->data, data->ie, data->ielen); 2272 2273 switch (data->ftype) { 2274 case CFG80211_BSS_FTYPE_BEACON: 2275 case CFG80211_BSS_FTYPE_S1G_BEACON: 2276 ies->from_beacon = true; 2277 fallthrough; 2278 case CFG80211_BSS_FTYPE_UNKNOWN: 2279 rcu_assign_pointer(tmp.pub.beacon_ies, ies); 2280 break; 2281 case CFG80211_BSS_FTYPE_PRESP: 2282 rcu_assign_pointer(tmp.pub.proberesp_ies, ies); 2283 break; 2284 } 2285 rcu_assign_pointer(tmp.pub.ies, ies); 2286 2287 signal_valid = drv_data->chan == channel; 2288 spin_lock_bh(&rdev->bss_lock); 2289 res = __cfg80211_bss_update(rdev, &tmp, signal_valid, ts); 2290 if (!res) 2291 goto drop; 2292 2293 rdev_inform_bss(rdev, &res->pub, ies, drv_data->drv_data); 2294 2295 if (data->bss_source == BSS_SOURCE_MBSSID) { 2296 /* this is a nontransmitting bss, we need to add it to 2297 * transmitting bss' list if it is not there 2298 */ 2299 if (cfg80211_add_nontrans_list(data->source_bss, &res->pub)) { 2300 if (__cfg80211_unlink_bss(rdev, res)) { 2301 rdev->bss_generation++; 2302 res = NULL; 2303 } 2304 } 2305 2306 if (!res) 2307 goto drop; 2308 } 2309 spin_unlock_bh(&rdev->bss_lock); 2310 2311 trace_cfg80211_return_bss(&res->pub); 2312 /* __cfg80211_bss_update gives us a referenced result */ 2313 return &res->pub; 2314 2315 drop: 2316 spin_unlock_bh(&rdev->bss_lock); 2317 return NULL; 2318 } 2319 2320 static const struct element 2321 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen, 2322 const struct element *mbssid_elem, 2323 const struct element *sub_elem) 2324 { 2325 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen; 2326 const struct element *next_mbssid; 2327 const struct element *next_sub; 2328 2329 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, 2330 mbssid_end, 2331 ielen - (mbssid_end - ie)); 2332 2333 /* 2334 * If it is not the last subelement in current MBSSID IE or there isn't 2335 * a next MBSSID IE - profile is complete. 2336 */ 2337 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) || 2338 !next_mbssid) 2339 return NULL; 2340 2341 /* For any length error, just return NULL */ 2342 2343 if (next_mbssid->datalen < 4) 2344 return NULL; 2345 2346 next_sub = (void *)&next_mbssid->data[1]; 2347 2348 if (next_mbssid->data + next_mbssid->datalen < 2349 next_sub->data + next_sub->datalen) 2350 return NULL; 2351 2352 if (next_sub->id != 0 || next_sub->datalen < 2) 2353 return NULL; 2354 2355 /* 2356 * Check if the first element in the next sub element is a start 2357 * of a new profile 2358 */ 2359 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ? 2360 NULL : next_mbssid; 2361 } 2362 2363 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen, 2364 const struct element *mbssid_elem, 2365 const struct element *sub_elem, 2366 u8 *merged_ie, size_t max_copy_len) 2367 { 2368 size_t copied_len = sub_elem->datalen; 2369 const struct element *next_mbssid; 2370 2371 if (sub_elem->datalen > max_copy_len) 2372 return 0; 2373 2374 memcpy(merged_ie, sub_elem->data, sub_elem->datalen); 2375 2376 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen, 2377 mbssid_elem, 2378 sub_elem))) { 2379 const struct element *next_sub = (void *)&next_mbssid->data[1]; 2380 2381 if (copied_len + next_sub->datalen > max_copy_len) 2382 break; 2383 memcpy(merged_ie + copied_len, next_sub->data, 2384 next_sub->datalen); 2385 copied_len += next_sub->datalen; 2386 } 2387 2388 return copied_len; 2389 } 2390 EXPORT_SYMBOL(cfg80211_merge_profile); 2391 2392 static void 2393 cfg80211_parse_mbssid_data(struct wiphy *wiphy, 2394 struct cfg80211_inform_single_bss_data *tx_data, 2395 struct cfg80211_bss *source_bss, 2396 gfp_t gfp) 2397 { 2398 struct cfg80211_inform_single_bss_data data = { 2399 .drv_data = tx_data->drv_data, 2400 .ftype = tx_data->ftype, 2401 .tsf = tx_data->tsf, 2402 .beacon_interval = tx_data->beacon_interval, 2403 .source_bss = source_bss, 2404 .bss_source = BSS_SOURCE_MBSSID, 2405 .use_for = tx_data->use_for, 2406 .cannot_use_reasons = tx_data->cannot_use_reasons, 2407 }; 2408 const u8 *mbssid_index_ie; 2409 const struct element *elem, *sub; 2410 u8 *new_ie, *profile; 2411 u64 seen_indices = 0; 2412 struct cfg80211_bss *bss; 2413 2414 if (!source_bss) 2415 return; 2416 if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, 2417 tx_data->ie, tx_data->ielen)) 2418 return; 2419 if (!wiphy->support_mbssid) 2420 return; 2421 if (wiphy->support_only_he_mbssid && 2422 !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, 2423 tx_data->ie, tx_data->ielen)) 2424 return; 2425 2426 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); 2427 if (!new_ie) 2428 return; 2429 2430 profile = kmalloc(tx_data->ielen, gfp); 2431 if (!profile) 2432 goto out; 2433 2434 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, 2435 tx_data->ie, tx_data->ielen) { 2436 if (elem->datalen < 4) 2437 continue; 2438 if (elem->data[0] < 1 || (int)elem->data[0] > 8) 2439 continue; 2440 for_each_element(sub, elem->data + 1, elem->datalen - 1) { 2441 u8 profile_len; 2442 2443 if (sub->id != 0 || sub->datalen < 4) { 2444 /* not a valid BSS profile */ 2445 continue; 2446 } 2447 2448 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP || 2449 sub->data[1] != 2) { 2450 /* The first element within the Nontransmitted 2451 * BSSID Profile is not the Nontransmitted 2452 * BSSID Capability element. 2453 */ 2454 continue; 2455 } 2456 2457 memset(profile, 0, tx_data->ielen); 2458 profile_len = cfg80211_merge_profile(tx_data->ie, 2459 tx_data->ielen, 2460 elem, 2461 sub, 2462 profile, 2463 tx_data->ielen); 2464 2465 /* found a Nontransmitted BSSID Profile */ 2466 mbssid_index_ie = cfg80211_find_ie 2467 (WLAN_EID_MULTI_BSSID_IDX, 2468 profile, profile_len); 2469 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 || 2470 mbssid_index_ie[2] == 0 || 2471 mbssid_index_ie[2] > 46 || 2472 mbssid_index_ie[2] >= (1 << elem->data[0])) { 2473 /* No valid Multiple BSSID-Index element */ 2474 continue; 2475 } 2476 2477 if (seen_indices & BIT_ULL(mbssid_index_ie[2])) 2478 /* We don't support legacy split of a profile */ 2479 net_dbg_ratelimited("Partial info for BSSID index %d\n", 2480 mbssid_index_ie[2]); 2481 2482 seen_indices |= BIT_ULL(mbssid_index_ie[2]); 2483 2484 data.bssid_index = mbssid_index_ie[2]; 2485 data.max_bssid_indicator = elem->data[0]; 2486 2487 cfg80211_gen_new_bssid(tx_data->bssid, 2488 data.max_bssid_indicator, 2489 data.bssid_index, 2490 data.bssid); 2491 2492 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); 2493 data.ie = new_ie; 2494 data.ielen = cfg80211_gen_new_ie(tx_data->ie, 2495 tx_data->ielen, 2496 profile, 2497 profile_len, 2498 new_ie, 2499 IEEE80211_MAX_DATA_LEN); 2500 if (!data.ielen) 2501 continue; 2502 2503 data.capability = get_unaligned_le16(profile + 2); 2504 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp); 2505 if (!bss) 2506 break; 2507 cfg80211_put_bss(wiphy, bss); 2508 } 2509 } 2510 2511 out: 2512 kfree(new_ie); 2513 kfree(profile); 2514 } 2515 2516 ssize_t cfg80211_defragment_element(const struct element *elem, const u8 *ies, 2517 size_t ieslen, u8 *data, size_t data_len, 2518 u8 frag_id) 2519 { 2520 const struct element *next; 2521 ssize_t copied; 2522 u8 elem_datalen; 2523 2524 if (!elem) 2525 return -EINVAL; 2526 2527 /* elem might be invalid after the memmove */ 2528 next = (void *)(elem->data + elem->datalen); 2529 elem_datalen = elem->datalen; 2530 2531 if (elem->id == WLAN_EID_EXTENSION) { 2532 copied = elem->datalen - 1; 2533 2534 if (data) { 2535 if (copied > data_len) 2536 return -ENOSPC; 2537 2538 memmove(data, elem->data + 1, copied); 2539 } 2540 } else { 2541 copied = elem->datalen; 2542 2543 if (data) { 2544 if (copied > data_len) 2545 return -ENOSPC; 2546 2547 memmove(data, elem->data, copied); 2548 } 2549 } 2550 2551 /* Fragmented elements must have 255 bytes */ 2552 if (elem_datalen < 255) 2553 return copied; 2554 2555 for (elem = next; 2556 elem->data < ies + ieslen && 2557 elem->data + elem->datalen <= ies + ieslen; 2558 elem = next) { 2559 /* elem might be invalid after the memmove */ 2560 next = (void *)(elem->data + elem->datalen); 2561 2562 if (elem->id != frag_id) 2563 break; 2564 2565 elem_datalen = elem->datalen; 2566 2567 if (data) { 2568 if (copied + elem_datalen > data_len) 2569 return -ENOSPC; 2570 2571 memmove(data + copied, elem->data, elem_datalen); 2572 } 2573 2574 copied += elem_datalen; 2575 2576 /* Only the last fragment may be short */ 2577 if (elem_datalen != 255) 2578 break; 2579 } 2580 2581 return copied; 2582 } 2583 EXPORT_SYMBOL(cfg80211_defragment_element); 2584 2585 struct cfg80211_mle { 2586 struct ieee80211_multi_link_elem *mle; 2587 struct ieee80211_mle_per_sta_profile 2588 *sta_prof[IEEE80211_MLD_MAX_NUM_LINKS]; 2589 ssize_t sta_prof_len[IEEE80211_MLD_MAX_NUM_LINKS]; 2590 2591 u8 data[]; 2592 }; 2593 2594 static struct cfg80211_mle * 2595 cfg80211_defrag_mle(const struct element *mle, const u8 *ie, size_t ielen, 2596 gfp_t gfp) 2597 { 2598 const struct element *elem; 2599 struct cfg80211_mle *res; 2600 size_t buf_len; 2601 ssize_t mle_len; 2602 u8 common_size, idx; 2603 2604 if (!mle || !ieee80211_mle_size_ok(mle->data + 1, mle->datalen - 1)) 2605 return NULL; 2606 2607 /* Required length for first defragmentation */ 2608 buf_len = mle->datalen - 1; 2609 for_each_element(elem, mle->data + mle->datalen, 2610 ielen - sizeof(*mle) + mle->datalen) { 2611 if (elem->id != WLAN_EID_FRAGMENT) 2612 break; 2613 2614 buf_len += elem->datalen; 2615 } 2616 2617 res = kzalloc(struct_size(res, data, buf_len), gfp); 2618 if (!res) 2619 return NULL; 2620 2621 mle_len = cfg80211_defragment_element(mle, ie, ielen, 2622 res->data, buf_len, 2623 WLAN_EID_FRAGMENT); 2624 if (mle_len < 0) 2625 goto error; 2626 2627 res->mle = (void *)res->data; 2628 2629 /* Find the sub-element area in the buffer */ 2630 common_size = ieee80211_mle_common_size((u8 *)res->mle); 2631 ie = res->data + common_size; 2632 ielen = mle_len - common_size; 2633 2634 idx = 0; 2635 for_each_element_id(elem, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE, 2636 ie, ielen) { 2637 res->sta_prof[idx] = (void *)elem->data; 2638 res->sta_prof_len[idx] = elem->datalen; 2639 2640 idx++; 2641 if (idx >= IEEE80211_MLD_MAX_NUM_LINKS) 2642 break; 2643 } 2644 if (!for_each_element_completed(elem, ie, ielen)) 2645 goto error; 2646 2647 /* Defragment sta_info in-place */ 2648 for (idx = 0; idx < IEEE80211_MLD_MAX_NUM_LINKS && res->sta_prof[idx]; 2649 idx++) { 2650 if (res->sta_prof_len[idx] < 255) 2651 continue; 2652 2653 elem = (void *)res->sta_prof[idx] - 2; 2654 2655 if (idx + 1 < ARRAY_SIZE(res->sta_prof) && 2656 res->sta_prof[idx + 1]) 2657 buf_len = (u8 *)res->sta_prof[idx + 1] - 2658 (u8 *)res->sta_prof[idx]; 2659 else 2660 buf_len = ielen + ie - (u8 *)elem; 2661 2662 res->sta_prof_len[idx] = 2663 cfg80211_defragment_element(elem, 2664 (u8 *)elem, buf_len, 2665 (u8 *)res->sta_prof[idx], 2666 buf_len, 2667 IEEE80211_MLE_SUBELEM_FRAGMENT); 2668 if (res->sta_prof_len[idx] < 0) 2669 goto error; 2670 } 2671 2672 return res; 2673 2674 error: 2675 kfree(res); 2676 return NULL; 2677 } 2678 2679 struct tbtt_info_iter_data { 2680 const struct ieee80211_neighbor_ap_info *ap_info; 2681 u8 param_ch_count; 2682 u32 use_for; 2683 u8 mld_id, link_id; 2684 bool non_tx; 2685 }; 2686 2687 static enum cfg80211_rnr_iter_ret 2688 cfg802121_mld_ap_rnr_iter(void *_data, u8 type, 2689 const struct ieee80211_neighbor_ap_info *info, 2690 const u8 *tbtt_info, u8 tbtt_info_len) 2691 { 2692 const struct ieee80211_rnr_mld_params *mld_params; 2693 struct tbtt_info_iter_data *data = _data; 2694 u8 link_id; 2695 bool non_tx = false; 2696 2697 if (type == IEEE80211_TBTT_INFO_TYPE_TBTT && 2698 tbtt_info_len >= offsetofend(struct ieee80211_tbtt_info_ge_11, 2699 mld_params)) { 2700 const struct ieee80211_tbtt_info_ge_11 *tbtt_info_ge_11 = 2701 (void *)tbtt_info; 2702 2703 non_tx = (tbtt_info_ge_11->bss_params & 2704 (IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID | 2705 IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID)) == 2706 IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID; 2707 mld_params = &tbtt_info_ge_11->mld_params; 2708 } else if (type == IEEE80211_TBTT_INFO_TYPE_MLD && 2709 tbtt_info_len >= sizeof(struct ieee80211_rnr_mld_params)) 2710 mld_params = (void *)tbtt_info; 2711 else 2712 return RNR_ITER_CONTINUE; 2713 2714 link_id = le16_get_bits(mld_params->params, 2715 IEEE80211_RNR_MLD_PARAMS_LINK_ID); 2716 2717 if (data->mld_id != mld_params->mld_id) 2718 return RNR_ITER_CONTINUE; 2719 2720 if (data->link_id != link_id) 2721 return RNR_ITER_CONTINUE; 2722 2723 data->ap_info = info; 2724 data->param_ch_count = 2725 le16_get_bits(mld_params->params, 2726 IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT); 2727 data->non_tx = non_tx; 2728 2729 if (type == IEEE80211_TBTT_INFO_TYPE_TBTT) 2730 data->use_for = NL80211_BSS_USE_FOR_ALL; 2731 else 2732 data->use_for = NL80211_BSS_USE_FOR_MLD_LINK; 2733 return RNR_ITER_BREAK; 2734 } 2735 2736 static u8 2737 cfg80211_rnr_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id, 2738 const struct ieee80211_neighbor_ap_info **ap_info, 2739 u8 *param_ch_count, bool *non_tx) 2740 { 2741 struct tbtt_info_iter_data data = { 2742 .mld_id = mld_id, 2743 .link_id = link_id, 2744 }; 2745 2746 cfg80211_iter_rnr(ie, ielen, cfg802121_mld_ap_rnr_iter, &data); 2747 2748 *ap_info = data.ap_info; 2749 *param_ch_count = data.param_ch_count; 2750 *non_tx = data.non_tx; 2751 2752 return data.use_for; 2753 } 2754 2755 static struct element * 2756 cfg80211_gen_reporter_rnr(struct cfg80211_bss *source_bss, bool is_mbssid, 2757 bool same_mld, u8 link_id, u8 bss_change_count, 2758 gfp_t gfp) 2759 { 2760 const struct cfg80211_bss_ies *ies; 2761 struct ieee80211_neighbor_ap_info ap_info; 2762 struct ieee80211_tbtt_info_ge_11 tbtt_info; 2763 u32 short_ssid; 2764 const struct element *elem; 2765 struct element *res; 2766 2767 /* 2768 * We only generate the RNR to permit ML lookups. For that we do not 2769 * need an entry for the corresponding transmitting BSS, lets just skip 2770 * it even though it would be easy to add. 2771 */ 2772 if (!same_mld) 2773 return NULL; 2774 2775 /* We could use tx_data->ies if we change cfg80211_calc_short_ssid */ 2776 rcu_read_lock(); 2777 ies = rcu_dereference(source_bss->ies); 2778 2779 ap_info.tbtt_info_len = offsetofend(typeof(tbtt_info), mld_params); 2780 ap_info.tbtt_info_hdr = 2781 u8_encode_bits(IEEE80211_TBTT_INFO_TYPE_TBTT, 2782 IEEE80211_AP_INFO_TBTT_HDR_TYPE) | 2783 u8_encode_bits(0, IEEE80211_AP_INFO_TBTT_HDR_COUNT); 2784 2785 ap_info.channel = ieee80211_frequency_to_channel(source_bss->channel->center_freq); 2786 2787 /* operating class */ 2788 elem = cfg80211_find_elem(WLAN_EID_SUPPORTED_REGULATORY_CLASSES, 2789 ies->data, ies->len); 2790 if (elem && elem->datalen >= 1) { 2791 ap_info.op_class = elem->data[0]; 2792 } else { 2793 struct cfg80211_chan_def chandef; 2794 2795 /* The AP is not providing us with anything to work with. So 2796 * make up a somewhat reasonable operating class, but don't 2797 * bother with it too much as no one will ever use the 2798 * information. 2799 */ 2800 cfg80211_chandef_create(&chandef, source_bss->channel, 2801 NL80211_CHAN_NO_HT); 2802 2803 if (!ieee80211_chandef_to_operating_class(&chandef, 2804 &ap_info.op_class)) 2805 goto out_unlock; 2806 } 2807 2808 /* Just set TBTT offset and PSD 20 to invalid/unknown */ 2809 tbtt_info.tbtt_offset = 255; 2810 tbtt_info.psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED; 2811 2812 memcpy(tbtt_info.bssid, source_bss->bssid, ETH_ALEN); 2813 if (cfg80211_calc_short_ssid(ies, &elem, &short_ssid)) 2814 goto out_unlock; 2815 2816 rcu_read_unlock(); 2817 2818 tbtt_info.short_ssid = cpu_to_le32(short_ssid); 2819 2820 tbtt_info.bss_params = IEEE80211_RNR_TBTT_PARAMS_SAME_SSID; 2821 2822 if (is_mbssid) { 2823 tbtt_info.bss_params |= IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID; 2824 tbtt_info.bss_params |= IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID; 2825 } 2826 2827 tbtt_info.mld_params.mld_id = 0; 2828 tbtt_info.mld_params.params = 2829 le16_encode_bits(link_id, IEEE80211_RNR_MLD_PARAMS_LINK_ID) | 2830 le16_encode_bits(bss_change_count, 2831 IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT); 2832 2833 res = kzalloc(struct_size(res, data, 2834 sizeof(ap_info) + ap_info.tbtt_info_len), 2835 gfp); 2836 if (!res) 2837 return NULL; 2838 2839 /* Copy the data */ 2840 res->id = WLAN_EID_REDUCED_NEIGHBOR_REPORT; 2841 res->datalen = sizeof(ap_info) + ap_info.tbtt_info_len; 2842 memcpy(res->data, &ap_info, sizeof(ap_info)); 2843 memcpy(res->data + sizeof(ap_info), &tbtt_info, ap_info.tbtt_info_len); 2844 2845 return res; 2846 2847 out_unlock: 2848 rcu_read_unlock(); 2849 return NULL; 2850 } 2851 2852 static void 2853 cfg80211_parse_ml_elem_sta_data(struct wiphy *wiphy, 2854 struct cfg80211_inform_single_bss_data *tx_data, 2855 struct cfg80211_bss *source_bss, 2856 const struct element *elem, 2857 gfp_t gfp) 2858 { 2859 struct cfg80211_inform_single_bss_data data = { 2860 .drv_data = tx_data->drv_data, 2861 .ftype = tx_data->ftype, 2862 .source_bss = source_bss, 2863 .bss_source = BSS_SOURCE_STA_PROFILE, 2864 }; 2865 struct element *reporter_rnr = NULL; 2866 struct ieee80211_multi_link_elem *ml_elem; 2867 struct cfg80211_mle *mle; 2868 u16 control; 2869 u8 ml_common_len; 2870 u8 *new_ie = NULL; 2871 struct cfg80211_bss *bss; 2872 u8 mld_id, reporter_link_id, bss_change_count; 2873 u16 seen_links = 0; 2874 u8 i; 2875 2876 if (!ieee80211_mle_type_ok(elem->data + 1, 2877 IEEE80211_ML_CONTROL_TYPE_BASIC, 2878 elem->datalen - 1)) 2879 return; 2880 2881 ml_elem = (void *)(elem->data + 1); 2882 control = le16_to_cpu(ml_elem->control); 2883 ml_common_len = ml_elem->variable[0]; 2884 2885 /* Must be present when transmitted by an AP (in a probe response) */ 2886 if (!(control & IEEE80211_MLC_BASIC_PRES_BSS_PARAM_CH_CNT) || 2887 !(control & IEEE80211_MLC_BASIC_PRES_LINK_ID) || 2888 !(control & IEEE80211_MLC_BASIC_PRES_MLD_CAPA_OP)) 2889 return; 2890 2891 reporter_link_id = ieee80211_mle_get_link_id(elem->data + 1); 2892 bss_change_count = ieee80211_mle_get_bss_param_ch_cnt(elem->data + 1); 2893 2894 /* 2895 * The MLD ID of the reporting AP is always zero. It is set if the AP 2896 * is part of an MBSSID set and will be non-zero for ML Elements 2897 * relating to a nontransmitted BSS (matching the Multi-BSSID Index, 2898 * Draft P802.11be_D3.2, 35.3.4.2) 2899 */ 2900 mld_id = ieee80211_mle_get_mld_id(elem->data + 1); 2901 2902 /* Fully defrag the ML element for sta information/profile iteration */ 2903 mle = cfg80211_defrag_mle(elem, tx_data->ie, tx_data->ielen, gfp); 2904 if (!mle) 2905 return; 2906 2907 /* No point in doing anything if there is no per-STA profile */ 2908 if (!mle->sta_prof[0]) 2909 goto out; 2910 2911 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp); 2912 if (!new_ie) 2913 goto out; 2914 2915 reporter_rnr = cfg80211_gen_reporter_rnr(source_bss, 2916 u16_get_bits(control, 2917 IEEE80211_MLC_BASIC_PRES_MLD_ID), 2918 mld_id == 0, reporter_link_id, 2919 bss_change_count, 2920 gfp); 2921 2922 for (i = 0; i < ARRAY_SIZE(mle->sta_prof) && mle->sta_prof[i]; i++) { 2923 const struct ieee80211_neighbor_ap_info *ap_info; 2924 enum nl80211_band band; 2925 u32 freq; 2926 const u8 *profile; 2927 ssize_t profile_len; 2928 u8 param_ch_count; 2929 u8 link_id, use_for; 2930 bool non_tx; 2931 2932 if (!ieee80211_mle_basic_sta_prof_size_ok((u8 *)mle->sta_prof[i], 2933 mle->sta_prof_len[i])) 2934 continue; 2935 2936 control = le16_to_cpu(mle->sta_prof[i]->control); 2937 2938 if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE)) 2939 continue; 2940 2941 link_id = u16_get_bits(control, 2942 IEEE80211_MLE_STA_CONTROL_LINK_ID); 2943 if (seen_links & BIT(link_id)) 2944 break; 2945 seen_links |= BIT(link_id); 2946 2947 if (!(control & IEEE80211_MLE_STA_CONTROL_BEACON_INT_PRESENT) || 2948 !(control & IEEE80211_MLE_STA_CONTROL_TSF_OFFS_PRESENT) || 2949 !(control & IEEE80211_MLE_STA_CONTROL_STA_MAC_ADDR_PRESENT)) 2950 continue; 2951 2952 memcpy(data.bssid, mle->sta_prof[i]->variable, ETH_ALEN); 2953 data.beacon_interval = 2954 get_unaligned_le16(mle->sta_prof[i]->variable + 6); 2955 data.tsf = tx_data->tsf + 2956 get_unaligned_le64(mle->sta_prof[i]->variable + 8); 2957 2958 /* sta_info_len counts itself */ 2959 profile = mle->sta_prof[i]->variable + 2960 mle->sta_prof[i]->sta_info_len - 1; 2961 profile_len = (u8 *)mle->sta_prof[i] + mle->sta_prof_len[i] - 2962 profile; 2963 2964 if (profile_len < 2) 2965 continue; 2966 2967 data.capability = get_unaligned_le16(profile); 2968 profile += 2; 2969 profile_len -= 2; 2970 2971 /* Find in RNR to look up channel information */ 2972 use_for = cfg80211_rnr_info_for_mld_ap(tx_data->ie, 2973 tx_data->ielen, 2974 mld_id, link_id, 2975 &ap_info, 2976 ¶m_ch_count, 2977 &non_tx); 2978 if (!use_for) 2979 continue; 2980 2981 /* 2982 * As of 802.11be_D5.0, the specification does not give us any 2983 * way of discovering both the MaxBSSID and the Multiple-BSSID 2984 * Index. It does seem like the Multiple-BSSID Index element 2985 * may be provided, but section 9.4.2.45 explicitly forbids 2986 * including a Multiple-BSSID Element (in this case without any 2987 * subelements). 2988 * Without both pieces of information we cannot calculate the 2989 * reference BSSID, so simply ignore the BSS. 2990 */ 2991 if (non_tx) 2992 continue; 2993 2994 /* We could sanity check the BSSID is included */ 2995 2996 if (!ieee80211_operating_class_to_band(ap_info->op_class, 2997 &band)) 2998 continue; 2999 3000 freq = ieee80211_channel_to_freq_khz(ap_info->channel, band); 3001 data.channel = ieee80211_get_channel_khz(wiphy, freq); 3002 3003 if (use_for == NL80211_BSS_USE_FOR_MLD_LINK && 3004 !(wiphy->flags & WIPHY_FLAG_SUPPORTS_NSTR_NONPRIMARY)) { 3005 use_for = 0; 3006 data.cannot_use_reasons = 3007 NL80211_BSS_CANNOT_USE_NSTR_NONPRIMARY; 3008 } 3009 data.use_for = use_for; 3010 3011 /* Generate new elements */ 3012 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN); 3013 data.ie = new_ie; 3014 data.ielen = cfg80211_gen_new_ie(tx_data->ie, tx_data->ielen, 3015 profile, profile_len, 3016 new_ie, 3017 IEEE80211_MAX_DATA_LEN); 3018 if (!data.ielen) 3019 continue; 3020 3021 /* The generated elements do not contain: 3022 * - Basic ML element 3023 * - A TBTT entry in the RNR for the transmitting AP 3024 * 3025 * This information is needed both internally and in userspace 3026 * as such, we should append it here. 3027 */ 3028 if (data.ielen + 3 + sizeof(*ml_elem) + ml_common_len > 3029 IEEE80211_MAX_DATA_LEN) 3030 continue; 3031 3032 /* Copy the Basic Multi-Link element including the common 3033 * information, and then fix up the link ID and BSS param 3034 * change count. 3035 * Note that the ML element length has been verified and we 3036 * also checked that it contains the link ID. 3037 */ 3038 new_ie[data.ielen++] = WLAN_EID_EXTENSION; 3039 new_ie[data.ielen++] = 1 + sizeof(*ml_elem) + ml_common_len; 3040 new_ie[data.ielen++] = WLAN_EID_EXT_EHT_MULTI_LINK; 3041 memcpy(new_ie + data.ielen, ml_elem, 3042 sizeof(*ml_elem) + ml_common_len); 3043 3044 new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN] = link_id; 3045 new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN + 1] = 3046 param_ch_count; 3047 3048 data.ielen += sizeof(*ml_elem) + ml_common_len; 3049 3050 if (reporter_rnr && (use_for & NL80211_BSS_USE_FOR_NORMAL)) { 3051 if (data.ielen + sizeof(struct element) + 3052 reporter_rnr->datalen > IEEE80211_MAX_DATA_LEN) 3053 continue; 3054 3055 memcpy(new_ie + data.ielen, reporter_rnr, 3056 sizeof(struct element) + reporter_rnr->datalen); 3057 data.ielen += sizeof(struct element) + 3058 reporter_rnr->datalen; 3059 } 3060 3061 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp); 3062 if (!bss) 3063 break; 3064 cfg80211_put_bss(wiphy, bss); 3065 } 3066 3067 out: 3068 kfree(reporter_rnr); 3069 kfree(new_ie); 3070 kfree(mle); 3071 } 3072 3073 static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy, 3074 struct cfg80211_inform_single_bss_data *tx_data, 3075 struct cfg80211_bss *source_bss, 3076 gfp_t gfp) 3077 { 3078 const struct element *elem; 3079 3080 if (!source_bss) 3081 return; 3082 3083 if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP) 3084 return; 3085 3086 for_each_element_extid(elem, WLAN_EID_EXT_EHT_MULTI_LINK, 3087 tx_data->ie, tx_data->ielen) 3088 cfg80211_parse_ml_elem_sta_data(wiphy, tx_data, source_bss, 3089 elem, gfp); 3090 } 3091 3092 struct cfg80211_bss * 3093 cfg80211_inform_bss_data(struct wiphy *wiphy, 3094 struct cfg80211_inform_bss *data, 3095 enum cfg80211_bss_frame_type ftype, 3096 const u8 *bssid, u64 tsf, u16 capability, 3097 u16 beacon_interval, const u8 *ie, size_t ielen, 3098 gfp_t gfp) 3099 { 3100 struct cfg80211_inform_single_bss_data inform_data = { 3101 .drv_data = data, 3102 .ftype = ftype, 3103 .tsf = tsf, 3104 .capability = capability, 3105 .beacon_interval = beacon_interval, 3106 .ie = ie, 3107 .ielen = ielen, 3108 .use_for = data->restrict_use ? 3109 data->use_for : 3110 NL80211_BSS_USE_FOR_ALL, 3111 .cannot_use_reasons = data->cannot_use_reasons, 3112 }; 3113 struct cfg80211_bss *res; 3114 3115 memcpy(inform_data.bssid, bssid, ETH_ALEN); 3116 3117 res = cfg80211_inform_single_bss_data(wiphy, &inform_data, gfp); 3118 if (!res) 3119 return NULL; 3120 3121 /* don't do any further MBSSID/ML handling for S1G */ 3122 if (ftype == CFG80211_BSS_FTYPE_S1G_BEACON) 3123 return res; 3124 3125 cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp); 3126 3127 cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp); 3128 3129 return res; 3130 } 3131 EXPORT_SYMBOL(cfg80211_inform_bss_data); 3132 3133 struct cfg80211_bss * 3134 cfg80211_inform_bss_frame_data(struct wiphy *wiphy, 3135 struct cfg80211_inform_bss *data, 3136 struct ieee80211_mgmt *mgmt, size_t len, 3137 gfp_t gfp) 3138 { 3139 size_t min_hdr_len = offsetof(struct ieee80211_mgmt, 3140 u.probe_resp.variable); 3141 struct ieee80211_ext *ext = NULL; 3142 enum cfg80211_bss_frame_type ftype; 3143 u16 beacon_interval; 3144 const u8 *bssid; 3145 u16 capability; 3146 const u8 *ie; 3147 size_t ielen; 3148 u64 tsf; 3149 3150 if (WARN_ON(!mgmt)) 3151 return NULL; 3152 3153 if (WARN_ON(!wiphy)) 3154 return NULL; 3155 3156 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) != 3157 offsetof(struct ieee80211_mgmt, u.beacon.variable)); 3158 3159 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len); 3160 3161 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) { 3162 ext = (void *) mgmt; 3163 min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon); 3164 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) 3165 min_hdr_len = offsetof(struct ieee80211_ext, 3166 u.s1g_short_beacon.variable); 3167 } 3168 3169 if (WARN_ON(len < min_hdr_len)) 3170 return NULL; 3171 3172 ielen = len - min_hdr_len; 3173 ie = mgmt->u.probe_resp.variable; 3174 if (ext) { 3175 const struct ieee80211_s1g_bcn_compat_ie *compat; 3176 const struct element *elem; 3177 3178 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control)) 3179 ie = ext->u.s1g_short_beacon.variable; 3180 else 3181 ie = ext->u.s1g_beacon.variable; 3182 3183 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT, ie, ielen); 3184 if (!elem) 3185 return NULL; 3186 if (elem->datalen < sizeof(*compat)) 3187 return NULL; 3188 compat = (void *)elem->data; 3189 bssid = ext->u.s1g_beacon.sa; 3190 capability = le16_to_cpu(compat->compat_info); 3191 beacon_interval = le16_to_cpu(compat->beacon_int); 3192 } else { 3193 bssid = mgmt->bssid; 3194 beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int); 3195 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); 3196 } 3197 3198 tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); 3199 3200 if (ieee80211_is_probe_resp(mgmt->frame_control)) 3201 ftype = CFG80211_BSS_FTYPE_PRESP; 3202 else if (ext) 3203 ftype = CFG80211_BSS_FTYPE_S1G_BEACON; 3204 else 3205 ftype = CFG80211_BSS_FTYPE_BEACON; 3206 3207 return cfg80211_inform_bss_data(wiphy, data, ftype, 3208 bssid, tsf, capability, 3209 beacon_interval, ie, ielen, 3210 gfp); 3211 } 3212 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data); 3213 3214 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 3215 { 3216 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 3217 3218 if (!pub) 3219 return; 3220 3221 spin_lock_bh(&rdev->bss_lock); 3222 bss_ref_get(rdev, bss_from_pub(pub)); 3223 spin_unlock_bh(&rdev->bss_lock); 3224 } 3225 EXPORT_SYMBOL(cfg80211_ref_bss); 3226 3227 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 3228 { 3229 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 3230 3231 if (!pub) 3232 return; 3233 3234 spin_lock_bh(&rdev->bss_lock); 3235 bss_ref_put(rdev, bss_from_pub(pub)); 3236 spin_unlock_bh(&rdev->bss_lock); 3237 } 3238 EXPORT_SYMBOL(cfg80211_put_bss); 3239 3240 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub) 3241 { 3242 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 3243 struct cfg80211_internal_bss *bss, *tmp1; 3244 struct cfg80211_bss *nontrans_bss, *tmp; 3245 3246 if (WARN_ON(!pub)) 3247 return; 3248 3249 bss = bss_from_pub(pub); 3250 3251 spin_lock_bh(&rdev->bss_lock); 3252 if (list_empty(&bss->list)) 3253 goto out; 3254 3255 list_for_each_entry_safe(nontrans_bss, tmp, 3256 &pub->nontrans_list, 3257 nontrans_list) { 3258 tmp1 = bss_from_pub(nontrans_bss); 3259 if (__cfg80211_unlink_bss(rdev, tmp1)) 3260 rdev->bss_generation++; 3261 } 3262 3263 if (__cfg80211_unlink_bss(rdev, bss)) 3264 rdev->bss_generation++; 3265 out: 3266 spin_unlock_bh(&rdev->bss_lock); 3267 } 3268 EXPORT_SYMBOL(cfg80211_unlink_bss); 3269 3270 void cfg80211_bss_iter(struct wiphy *wiphy, 3271 struct cfg80211_chan_def *chandef, 3272 void (*iter)(struct wiphy *wiphy, 3273 struct cfg80211_bss *bss, 3274 void *data), 3275 void *iter_data) 3276 { 3277 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 3278 struct cfg80211_internal_bss *bss; 3279 3280 spin_lock_bh(&rdev->bss_lock); 3281 3282 list_for_each_entry(bss, &rdev->bss_list, list) { 3283 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel, 3284 false)) 3285 iter(wiphy, &bss->pub, iter_data); 3286 } 3287 3288 spin_unlock_bh(&rdev->bss_lock); 3289 } 3290 EXPORT_SYMBOL(cfg80211_bss_iter); 3291 3292 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev, 3293 unsigned int link_id, 3294 struct ieee80211_channel *chan) 3295 { 3296 struct wiphy *wiphy = wdev->wiphy; 3297 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); 3298 struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss; 3299 struct cfg80211_internal_bss *new = NULL; 3300 struct cfg80211_internal_bss *bss; 3301 struct cfg80211_bss *nontrans_bss; 3302 struct cfg80211_bss *tmp; 3303 3304 spin_lock_bh(&rdev->bss_lock); 3305 3306 /* 3307 * Some APs use CSA also for bandwidth changes, i.e., without actually 3308 * changing the control channel, so no need to update in such a case. 3309 */ 3310 if (cbss->pub.channel == chan) 3311 goto done; 3312 3313 /* use transmitting bss */ 3314 if (cbss->pub.transmitted_bss) 3315 cbss = bss_from_pub(cbss->pub.transmitted_bss); 3316 3317 cbss->pub.channel = chan; 3318 3319 list_for_each_entry(bss, &rdev->bss_list, list) { 3320 if (!cfg80211_bss_type_match(bss->pub.capability, 3321 bss->pub.channel->band, 3322 wdev->conn_bss_type)) 3323 continue; 3324 3325 if (bss == cbss) 3326 continue; 3327 3328 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) { 3329 new = bss; 3330 break; 3331 } 3332 } 3333 3334 if (new) { 3335 /* to save time, update IEs for transmitting bss only */ 3336 cfg80211_update_known_bss(rdev, cbss, new, false); 3337 new->pub.proberesp_ies = NULL; 3338 new->pub.beacon_ies = NULL; 3339 3340 list_for_each_entry_safe(nontrans_bss, tmp, 3341 &new->pub.nontrans_list, 3342 nontrans_list) { 3343 bss = bss_from_pub(nontrans_bss); 3344 if (__cfg80211_unlink_bss(rdev, bss)) 3345 rdev->bss_generation++; 3346 } 3347 3348 WARN_ON(atomic_read(&new->hold)); 3349 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new))) 3350 rdev->bss_generation++; 3351 } 3352 3353 rb_erase(&cbss->rbn, &rdev->bss_tree); 3354 rb_insert_bss(rdev, cbss); 3355 rdev->bss_generation++; 3356 3357 list_for_each_entry_safe(nontrans_bss, tmp, 3358 &cbss->pub.nontrans_list, 3359 nontrans_list) { 3360 bss = bss_from_pub(nontrans_bss); 3361 bss->pub.channel = chan; 3362 rb_erase(&bss->rbn, &rdev->bss_tree); 3363 rb_insert_bss(rdev, bss); 3364 rdev->bss_generation++; 3365 } 3366 3367 done: 3368 spin_unlock_bh(&rdev->bss_lock); 3369 } 3370 3371 #ifdef CONFIG_CFG80211_WEXT 3372 static struct cfg80211_registered_device * 3373 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex) 3374 { 3375 struct cfg80211_registered_device *rdev; 3376 struct net_device *dev; 3377 3378 ASSERT_RTNL(); 3379 3380 dev = dev_get_by_index(net, ifindex); 3381 if (!dev) 3382 return ERR_PTR(-ENODEV); 3383 if (dev->ieee80211_ptr) 3384 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy); 3385 else 3386 rdev = ERR_PTR(-ENODEV); 3387 dev_put(dev); 3388 return rdev; 3389 } 3390 3391 int cfg80211_wext_siwscan(struct net_device *dev, 3392 struct iw_request_info *info, 3393 union iwreq_data *wrqu, char *extra) 3394 { 3395 struct cfg80211_registered_device *rdev; 3396 struct wiphy *wiphy; 3397 struct iw_scan_req *wreq = NULL; 3398 struct cfg80211_scan_request *creq; 3399 int i, err, n_channels = 0; 3400 enum nl80211_band band; 3401 3402 if (!netif_running(dev)) 3403 return -ENETDOWN; 3404 3405 if (wrqu->data.length == sizeof(struct iw_scan_req)) 3406 wreq = (struct iw_scan_req *)extra; 3407 3408 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 3409 3410 if (IS_ERR(rdev)) 3411 return PTR_ERR(rdev); 3412 3413 if (rdev->scan_req || rdev->scan_msg) 3414 return -EBUSY; 3415 3416 wiphy = &rdev->wiphy; 3417 3418 /* Determine number of channels, needed to allocate creq */ 3419 if (wreq && wreq->num_channels) 3420 n_channels = wreq->num_channels; 3421 else 3422 n_channels = ieee80211_get_num_supported_channels(wiphy); 3423 3424 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) + 3425 n_channels * sizeof(void *), 3426 GFP_ATOMIC); 3427 if (!creq) 3428 return -ENOMEM; 3429 3430 creq->wiphy = wiphy; 3431 creq->wdev = dev->ieee80211_ptr; 3432 /* SSIDs come after channels */ 3433 creq->ssids = (void *)&creq->channels[n_channels]; 3434 creq->n_channels = n_channels; 3435 creq->n_ssids = 1; 3436 creq->scan_start = jiffies; 3437 3438 /* translate "Scan on frequencies" request */ 3439 i = 0; 3440 for (band = 0; band < NUM_NL80211_BANDS; band++) { 3441 int j; 3442 3443 if (!wiphy->bands[band]) 3444 continue; 3445 3446 for (j = 0; j < wiphy->bands[band]->n_channels; j++) { 3447 /* ignore disabled channels */ 3448 if (wiphy->bands[band]->channels[j].flags & 3449 IEEE80211_CHAN_DISABLED) 3450 continue; 3451 3452 /* If we have a wireless request structure and the 3453 * wireless request specifies frequencies, then search 3454 * for the matching hardware channel. 3455 */ 3456 if (wreq && wreq->num_channels) { 3457 int k; 3458 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq; 3459 for (k = 0; k < wreq->num_channels; k++) { 3460 struct iw_freq *freq = 3461 &wreq->channel_list[k]; 3462 int wext_freq = 3463 cfg80211_wext_freq(freq); 3464 3465 if (wext_freq == wiphy_freq) 3466 goto wext_freq_found; 3467 } 3468 goto wext_freq_not_found; 3469 } 3470 3471 wext_freq_found: 3472 creq->channels[i] = &wiphy->bands[band]->channels[j]; 3473 i++; 3474 wext_freq_not_found: ; 3475 } 3476 } 3477 /* No channels found? */ 3478 if (!i) { 3479 err = -EINVAL; 3480 goto out; 3481 } 3482 3483 /* Set real number of channels specified in creq->channels[] */ 3484 creq->n_channels = i; 3485 3486 /* translate "Scan for SSID" request */ 3487 if (wreq) { 3488 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) { 3489 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) { 3490 err = -EINVAL; 3491 goto out; 3492 } 3493 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len); 3494 creq->ssids[0].ssid_len = wreq->essid_len; 3495 } 3496 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE) 3497 creq->n_ssids = 0; 3498 } 3499 3500 for (i = 0; i < NUM_NL80211_BANDS; i++) 3501 if (wiphy->bands[i]) 3502 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1; 3503 3504 eth_broadcast_addr(creq->bssid); 3505 3506 wiphy_lock(&rdev->wiphy); 3507 3508 rdev->scan_req = creq; 3509 err = rdev_scan(rdev, creq); 3510 if (err) { 3511 rdev->scan_req = NULL; 3512 /* creq will be freed below */ 3513 } else { 3514 nl80211_send_scan_start(rdev, dev->ieee80211_ptr); 3515 /* creq now owned by driver */ 3516 creq = NULL; 3517 dev_hold(dev); 3518 } 3519 wiphy_unlock(&rdev->wiphy); 3520 out: 3521 kfree(creq); 3522 return err; 3523 } 3524 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan); 3525 3526 static char *ieee80211_scan_add_ies(struct iw_request_info *info, 3527 const struct cfg80211_bss_ies *ies, 3528 char *current_ev, char *end_buf) 3529 { 3530 const u8 *pos, *end, *next; 3531 struct iw_event iwe; 3532 3533 if (!ies) 3534 return current_ev; 3535 3536 /* 3537 * If needed, fragment the IEs buffer (at IE boundaries) into short 3538 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages. 3539 */ 3540 pos = ies->data; 3541 end = pos + ies->len; 3542 3543 while (end - pos > IW_GENERIC_IE_MAX) { 3544 next = pos + 2 + pos[1]; 3545 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX) 3546 next = next + 2 + next[1]; 3547 3548 memset(&iwe, 0, sizeof(iwe)); 3549 iwe.cmd = IWEVGENIE; 3550 iwe.u.data.length = next - pos; 3551 current_ev = iwe_stream_add_point_check(info, current_ev, 3552 end_buf, &iwe, 3553 (void *)pos); 3554 if (IS_ERR(current_ev)) 3555 return current_ev; 3556 pos = next; 3557 } 3558 3559 if (end > pos) { 3560 memset(&iwe, 0, sizeof(iwe)); 3561 iwe.cmd = IWEVGENIE; 3562 iwe.u.data.length = end - pos; 3563 current_ev = iwe_stream_add_point_check(info, current_ev, 3564 end_buf, &iwe, 3565 (void *)pos); 3566 if (IS_ERR(current_ev)) 3567 return current_ev; 3568 } 3569 3570 return current_ev; 3571 } 3572 3573 static char * 3574 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info, 3575 struct cfg80211_internal_bss *bss, char *current_ev, 3576 char *end_buf) 3577 { 3578 const struct cfg80211_bss_ies *ies; 3579 struct iw_event iwe; 3580 const u8 *ie; 3581 u8 buf[50]; 3582 u8 *cfg, *p, *tmp; 3583 int rem, i, sig; 3584 bool ismesh = false; 3585 3586 memset(&iwe, 0, sizeof(iwe)); 3587 iwe.cmd = SIOCGIWAP; 3588 iwe.u.ap_addr.sa_family = ARPHRD_ETHER; 3589 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN); 3590 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, 3591 IW_EV_ADDR_LEN); 3592 if (IS_ERR(current_ev)) 3593 return current_ev; 3594 3595 memset(&iwe, 0, sizeof(iwe)); 3596 iwe.cmd = SIOCGIWFREQ; 3597 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq); 3598 iwe.u.freq.e = 0; 3599 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, 3600 IW_EV_FREQ_LEN); 3601 if (IS_ERR(current_ev)) 3602 return current_ev; 3603 3604 memset(&iwe, 0, sizeof(iwe)); 3605 iwe.cmd = SIOCGIWFREQ; 3606 iwe.u.freq.m = bss->pub.channel->center_freq; 3607 iwe.u.freq.e = 6; 3608 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe, 3609 IW_EV_FREQ_LEN); 3610 if (IS_ERR(current_ev)) 3611 return current_ev; 3612 3613 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) { 3614 memset(&iwe, 0, sizeof(iwe)); 3615 iwe.cmd = IWEVQUAL; 3616 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED | 3617 IW_QUAL_NOISE_INVALID | 3618 IW_QUAL_QUAL_UPDATED; 3619 switch (wiphy->signal_type) { 3620 case CFG80211_SIGNAL_TYPE_MBM: 3621 sig = bss->pub.signal / 100; 3622 iwe.u.qual.level = sig; 3623 iwe.u.qual.updated |= IW_QUAL_DBM; 3624 if (sig < -110) /* rather bad */ 3625 sig = -110; 3626 else if (sig > -40) /* perfect */ 3627 sig = -40; 3628 /* will give a range of 0 .. 70 */ 3629 iwe.u.qual.qual = sig + 110; 3630 break; 3631 case CFG80211_SIGNAL_TYPE_UNSPEC: 3632 iwe.u.qual.level = bss->pub.signal; 3633 /* will give range 0 .. 100 */ 3634 iwe.u.qual.qual = bss->pub.signal; 3635 break; 3636 default: 3637 /* not reached */ 3638 break; 3639 } 3640 current_ev = iwe_stream_add_event_check(info, current_ev, 3641 end_buf, &iwe, 3642 IW_EV_QUAL_LEN); 3643 if (IS_ERR(current_ev)) 3644 return current_ev; 3645 } 3646 3647 memset(&iwe, 0, sizeof(iwe)); 3648 iwe.cmd = SIOCGIWENCODE; 3649 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY) 3650 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY; 3651 else 3652 iwe.u.data.flags = IW_ENCODE_DISABLED; 3653 iwe.u.data.length = 0; 3654 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, 3655 &iwe, ""); 3656 if (IS_ERR(current_ev)) 3657 return current_ev; 3658 3659 rcu_read_lock(); 3660 ies = rcu_dereference(bss->pub.ies); 3661 rem = ies->len; 3662 ie = ies->data; 3663 3664 while (rem >= 2) { 3665 /* invalid data */ 3666 if (ie[1] > rem - 2) 3667 break; 3668 3669 switch (ie[0]) { 3670 case WLAN_EID_SSID: 3671 memset(&iwe, 0, sizeof(iwe)); 3672 iwe.cmd = SIOCGIWESSID; 3673 iwe.u.data.length = ie[1]; 3674 iwe.u.data.flags = 1; 3675 current_ev = iwe_stream_add_point_check(info, 3676 current_ev, 3677 end_buf, &iwe, 3678 (u8 *)ie + 2); 3679 if (IS_ERR(current_ev)) 3680 goto unlock; 3681 break; 3682 case WLAN_EID_MESH_ID: 3683 memset(&iwe, 0, sizeof(iwe)); 3684 iwe.cmd = SIOCGIWESSID; 3685 iwe.u.data.length = ie[1]; 3686 iwe.u.data.flags = 1; 3687 current_ev = iwe_stream_add_point_check(info, 3688 current_ev, 3689 end_buf, &iwe, 3690 (u8 *)ie + 2); 3691 if (IS_ERR(current_ev)) 3692 goto unlock; 3693 break; 3694 case WLAN_EID_MESH_CONFIG: 3695 ismesh = true; 3696 if (ie[1] != sizeof(struct ieee80211_meshconf_ie)) 3697 break; 3698 cfg = (u8 *)ie + 2; 3699 memset(&iwe, 0, sizeof(iwe)); 3700 iwe.cmd = IWEVCUSTOM; 3701 iwe.u.data.length = sprintf(buf, 3702 "Mesh Network Path Selection Protocol ID: 0x%02X", 3703 cfg[0]); 3704 current_ev = iwe_stream_add_point_check(info, 3705 current_ev, 3706 end_buf, 3707 &iwe, buf); 3708 if (IS_ERR(current_ev)) 3709 goto unlock; 3710 iwe.u.data.length = sprintf(buf, 3711 "Path Selection Metric ID: 0x%02X", 3712 cfg[1]); 3713 current_ev = iwe_stream_add_point_check(info, 3714 current_ev, 3715 end_buf, 3716 &iwe, buf); 3717 if (IS_ERR(current_ev)) 3718 goto unlock; 3719 iwe.u.data.length = sprintf(buf, 3720 "Congestion Control Mode ID: 0x%02X", 3721 cfg[2]); 3722 current_ev = iwe_stream_add_point_check(info, 3723 current_ev, 3724 end_buf, 3725 &iwe, buf); 3726 if (IS_ERR(current_ev)) 3727 goto unlock; 3728 iwe.u.data.length = sprintf(buf, 3729 "Synchronization ID: 0x%02X", 3730 cfg[3]); 3731 current_ev = iwe_stream_add_point_check(info, 3732 current_ev, 3733 end_buf, 3734 &iwe, buf); 3735 if (IS_ERR(current_ev)) 3736 goto unlock; 3737 iwe.u.data.length = sprintf(buf, 3738 "Authentication ID: 0x%02X", 3739 cfg[4]); 3740 current_ev = iwe_stream_add_point_check(info, 3741 current_ev, 3742 end_buf, 3743 &iwe, buf); 3744 if (IS_ERR(current_ev)) 3745 goto unlock; 3746 iwe.u.data.length = sprintf(buf, 3747 "Formation Info: 0x%02X", 3748 cfg[5]); 3749 current_ev = iwe_stream_add_point_check(info, 3750 current_ev, 3751 end_buf, 3752 &iwe, buf); 3753 if (IS_ERR(current_ev)) 3754 goto unlock; 3755 iwe.u.data.length = sprintf(buf, 3756 "Capabilities: 0x%02X", 3757 cfg[6]); 3758 current_ev = iwe_stream_add_point_check(info, 3759 current_ev, 3760 end_buf, 3761 &iwe, buf); 3762 if (IS_ERR(current_ev)) 3763 goto unlock; 3764 break; 3765 case WLAN_EID_SUPP_RATES: 3766 case WLAN_EID_EXT_SUPP_RATES: 3767 /* display all supported rates in readable format */ 3768 p = current_ev + iwe_stream_lcp_len(info); 3769 3770 memset(&iwe, 0, sizeof(iwe)); 3771 iwe.cmd = SIOCGIWRATE; 3772 /* Those two flags are ignored... */ 3773 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0; 3774 3775 for (i = 0; i < ie[1]; i++) { 3776 iwe.u.bitrate.value = 3777 ((ie[i + 2] & 0x7f) * 500000); 3778 tmp = p; 3779 p = iwe_stream_add_value(info, current_ev, p, 3780 end_buf, &iwe, 3781 IW_EV_PARAM_LEN); 3782 if (p == tmp) { 3783 current_ev = ERR_PTR(-E2BIG); 3784 goto unlock; 3785 } 3786 } 3787 current_ev = p; 3788 break; 3789 } 3790 rem -= ie[1] + 2; 3791 ie += ie[1] + 2; 3792 } 3793 3794 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) || 3795 ismesh) { 3796 memset(&iwe, 0, sizeof(iwe)); 3797 iwe.cmd = SIOCGIWMODE; 3798 if (ismesh) 3799 iwe.u.mode = IW_MODE_MESH; 3800 else if (bss->pub.capability & WLAN_CAPABILITY_ESS) 3801 iwe.u.mode = IW_MODE_MASTER; 3802 else 3803 iwe.u.mode = IW_MODE_ADHOC; 3804 current_ev = iwe_stream_add_event_check(info, current_ev, 3805 end_buf, &iwe, 3806 IW_EV_UINT_LEN); 3807 if (IS_ERR(current_ev)) 3808 goto unlock; 3809 } 3810 3811 memset(&iwe, 0, sizeof(iwe)); 3812 iwe.cmd = IWEVCUSTOM; 3813 iwe.u.data.length = sprintf(buf, "tsf=%016llx", 3814 (unsigned long long)(ies->tsf)); 3815 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf, 3816 &iwe, buf); 3817 if (IS_ERR(current_ev)) 3818 goto unlock; 3819 memset(&iwe, 0, sizeof(iwe)); 3820 iwe.cmd = IWEVCUSTOM; 3821 iwe.u.data.length = sprintf(buf, " Last beacon: %ums ago", 3822 elapsed_jiffies_msecs(bss->ts)); 3823 current_ev = iwe_stream_add_point_check(info, current_ev, 3824 end_buf, &iwe, buf); 3825 if (IS_ERR(current_ev)) 3826 goto unlock; 3827 3828 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf); 3829 3830 unlock: 3831 rcu_read_unlock(); 3832 return current_ev; 3833 } 3834 3835 3836 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev, 3837 struct iw_request_info *info, 3838 char *buf, size_t len) 3839 { 3840 char *current_ev = buf; 3841 char *end_buf = buf + len; 3842 struct cfg80211_internal_bss *bss; 3843 int err = 0; 3844 3845 spin_lock_bh(&rdev->bss_lock); 3846 cfg80211_bss_expire(rdev); 3847 3848 list_for_each_entry(bss, &rdev->bss_list, list) { 3849 if (buf + len - current_ev <= IW_EV_ADDR_LEN) { 3850 err = -E2BIG; 3851 break; 3852 } 3853 current_ev = ieee80211_bss(&rdev->wiphy, info, bss, 3854 current_ev, end_buf); 3855 if (IS_ERR(current_ev)) { 3856 err = PTR_ERR(current_ev); 3857 break; 3858 } 3859 } 3860 spin_unlock_bh(&rdev->bss_lock); 3861 3862 if (err) 3863 return err; 3864 return current_ev - buf; 3865 } 3866 3867 3868 int cfg80211_wext_giwscan(struct net_device *dev, 3869 struct iw_request_info *info, 3870 union iwreq_data *wrqu, char *extra) 3871 { 3872 struct iw_point *data = &wrqu->data; 3873 struct cfg80211_registered_device *rdev; 3874 int res; 3875 3876 if (!netif_running(dev)) 3877 return -ENETDOWN; 3878 3879 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex); 3880 3881 if (IS_ERR(rdev)) 3882 return PTR_ERR(rdev); 3883 3884 if (rdev->scan_req || rdev->scan_msg) 3885 return -EAGAIN; 3886 3887 res = ieee80211_scan_results(rdev, info, extra, data->length); 3888 data->length = 0; 3889 if (res >= 0) { 3890 data->length = res; 3891 res = 0; 3892 } 3893 3894 return res; 3895 } 3896 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan); 3897 #endif 3898