net/wireless/scan.c

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