net/wireless/scan.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * cfg80211 scan result handling
   4  *
   5  * Copyright 2008 Johannes Berg <[email protected]>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2016       Intel Deutschland GmbH
   8  * Copyright (C) 2018-2021 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 "core.h"
  24 #include "nl80211.h"
  25 #include "wext-compat.h"
  26 #include "rdev-ops.h"
  27
  28 /**
  29  * DOC: BSS tree/list structure
  30  *
  31  * At the top level, the BSS list is kept in both a list in each
  32  * registered device (@bss_list) as well as an RB-tree for faster
  33  * lookup. In the RB-tree, entries can be looked up using their
  34  * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
  35  * for other BSSes.
  36  *
  37  * Due to the possibility of hidden SSIDs, there's a second level
  38  * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
  39  * The hidden_list connects all BSSes belonging to a single AP
  40  * that has a hidden SSID, and connects beacon and probe response
  41  * entries. For a probe response entry for a hidden SSID, the
  42  * hidden_beacon_bss pointer points to the BSS struct holding the
  43  * beacon's information.
  44  *
  45  * Reference counting is done for all these references except for
  46  * the hidden_list, so that a beacon BSS struct that is otherwise
  47  * not referenced has one reference for being on the bss_list and
  48  * one for each probe response entry that points to it using the
  49  * hidden_beacon_bss pointer. When a BSS struct that has such a
  50  * pointer is get/put, the refcount update is also propagated to
  51  * the referenced struct, this ensure that it cannot get removed
  52  * while somebody is using the probe response version.
  53  *
  54  * Note that the hidden_beacon_bss pointer never changes, due to
  55  * the reference counting. Therefore, no locking is needed for
  56  * it.
  57  *
  58  * Also note that the hidden_beacon_bss pointer is only relevant
  59  * if the driver uses something other than the IEs, e.g. private
  60  * data stored in the BSS struct, since the beacon IEs are
  61  * also linked into the probe response struct.
  62  */
  63
  64 /*
  65  * Limit the number of BSS entries stored in mac80211. Each one is
  66  * a bit over 4k at most, so this limits to roughly 4-5M of memory.
  67  * If somebody wants to really attack this though, they'd likely
  68  * use small beacons, and only one type of frame, limiting each of
  69  * the entries to a much smaller size (in order to generate more
  70  * entries in total, so overhead is bigger.)
  71  */
  72 static int bss_entries_limit = 1000;
  73 module_param(bss_entries_limit, int, 0644);
  74 MODULE_PARM_DESC(bss_entries_limit,
  75                  "limit to number of scan BSS entries (per wiphy, default 1000)");
  76
  77 #define IEEE80211_SCAN_RESULT_EXPIRE    (30 * HZ)
  78
  79 /**
  80  * struct cfg80211_colocated_ap - colocated AP information
  81  *
  82  * @list: linked list to all colocated aPS
  83  * @bssid: BSSID of the reported AP
  84  * @ssid: SSID of the reported AP
  85  * @ssid_len: length of the ssid
  86  * @center_freq: frequency the reported AP is on
  87  * @unsolicited_probe: the reported AP is part of an ESS, where all the APs
  88  *      that operate in the same channel as the reported AP and that might be
  89  *      detected by a STA receiving this frame, are transmitting unsolicited
  90  *      Probe Response frames every 20 TUs
  91  * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP
  92  * @same_ssid: the reported AP has the same SSID as the reporting AP
  93  * @multi_bss: the reported AP is part of a multiple BSSID set
  94  * @transmitted_bssid: the reported AP is the transmitting BSSID
  95  * @colocated_ess: all the APs that share the same ESS as the reported AP are
  96  *      colocated and can be discovered via legacy bands.
  97  * @short_ssid_valid: short_ssid is valid and can be used
  98  * @short_ssid: the short SSID for this SSID
  99  */
 100 struct cfg80211_colocated_ap {
 101         struct list_head list;
 102         u8 bssid[ETH_ALEN];
 103         u8 ssid[IEEE80211_MAX_SSID_LEN];
 104         size_t ssid_len;
 105         u32 short_ssid;
 106         u32 center_freq;
 107         u8 unsolicited_probe:1,
 108            oct_recommended:1,
 109            same_ssid:1,
 110            multi_bss:1,
 111            transmitted_bssid:1,
 112            colocated_ess:1,
 113            short_ssid_valid:1;
 114 };
 115
 116 static void bss_free(struct cfg80211_internal_bss *bss)
 117 {
 118         struct cfg80211_bss_ies *ies;
 119
 120         if (WARN_ON(atomic_read(&bss->hold)))
 121                 return;
 122
 123         ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
 124         if (ies && !bss->pub.hidden_beacon_bss)
 125                 kfree_rcu(ies, rcu_head);
 126         ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
 127         if (ies)
 128                 kfree_rcu(ies, rcu_head);
 129
 130         /*
 131          * This happens when the module is removed, it doesn't
 132          * really matter any more save for completeness
 133          */
 134         if (!list_empty(&bss->hidden_list))
 135                 list_del(&bss->hidden_list);
 136
 137         kfree(bss);
 138 }
 139
 140 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
 141                                struct cfg80211_internal_bss *bss)
 142 {
 143         lockdep_assert_held(&rdev->bss_lock);
 144
 145         bss->refcount++;
 146         if (bss->pub.hidden_beacon_bss) {
 147                 bss = container_of(bss->pub.hidden_beacon_bss,
 148                                    struct cfg80211_internal_bss,
 149                                    pub);
 150                 bss->refcount++;
 151         }
 152         if (bss->pub.transmitted_bss) {
 153                 bss = container_of(bss->pub.transmitted_bss,
 154                                    struct cfg80211_internal_bss,
 155                                    pub);
 156                 bss->refcount++;
 157         }
 158 }
 159
 160 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
 161                                struct cfg80211_internal_bss *bss)
 162 {
 163         lockdep_assert_held(&rdev->bss_lock);
 164
 165         if (bss->pub.hidden_beacon_bss) {
 166                 struct cfg80211_internal_bss *hbss;
 167                 hbss = container_of(bss->pub.hidden_beacon_bss,
 168                                     struct cfg80211_internal_bss,
 169                                     pub);
 170                 hbss->refcount--;
 171                 if (hbss->refcount == 0)
 172                         bss_free(hbss);
 173         }
 174
 175         if (bss->pub.transmitted_bss) {
 176                 struct cfg80211_internal_bss *tbss;
 177
 178                 tbss = container_of(bss->pub.transmitted_bss,
 179                                     struct cfg80211_internal_bss,
 180                                     pub);
 181                 tbss->refcount--;
 182                 if (tbss->refcount == 0)
 183                         bss_free(tbss);
 184         }
 185
 186         bss->refcount--;
 187         if (bss->refcount == 0)
 188                 bss_free(bss);
 189 }
 190
 191 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
 192                                   struct cfg80211_internal_bss *bss)
 193 {
 194         lockdep_assert_held(&rdev->bss_lock);
 195
 196         if (!list_empty(&bss->hidden_list)) {
 197                 /*
 198                  * don't remove the beacon entry if it has
 199                  * probe responses associated with it
 200                  */
 201                 if (!bss->pub.hidden_beacon_bss)
 202                         return false;
 203                 /*
 204                  * if it's a probe response entry break its
 205                  * link to the other entries in the group
 206                  */
 207                 list_del_init(&bss->hidden_list);
 208         }
 209
 210         list_del_init(&bss->list);
 211         list_del_init(&bss->pub.nontrans_list);
 212         rb_erase(&bss->rbn, &rdev->bss_tree);
 213         rdev->bss_entries--;
 214         WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
 215                   "rdev bss entries[%d]/list[empty:%d] corruption\n",
 216                   rdev->bss_entries, list_empty(&rdev->bss_list));
 217         bss_ref_put(rdev, bss);
 218         return true;
 219 }
 220
 221 bool cfg80211_is_element_inherited(const struct element *elem,
 222                                    const struct element *non_inherit_elem)
 223 {
 224         u8 id_len, ext_id_len, i, loop_len, id;
 225         const u8 *list;
 226
 227         if (elem->id == WLAN_EID_MULTIPLE_BSSID)
 228                 return false;
 229
 230         if (!non_inherit_elem || non_inherit_elem->datalen < 2)
 231                 return true;
 232
 233         /*
 234          * non inheritance element format is:
 235          * ext ID (56) | IDs list len | list | extension IDs list len | list
 236          * Both lists are optional. Both lengths are mandatory.
 237          * This means valid length is:
 238          * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
 239          */
 240         id_len = non_inherit_elem->data[1];
 241         if (non_inherit_elem->datalen < 3 + id_len)
 242                 return true;
 243
 244         ext_id_len = non_inherit_elem->data[2 + id_len];
 245         if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
 246                 return true;
 247
 248         if (elem->id == WLAN_EID_EXTENSION) {
 249                 if (!ext_id_len)
 250                         return true;
 251                 loop_len = ext_id_len;
 252                 list = &non_inherit_elem->data[3 + id_len];
 253                 id = elem->data[0];
 254         } else {
 255                 if (!id_len)
 256                         return true;
 257                 loop_len = id_len;
 258                 list = &non_inherit_elem->data[2];
 259                 id = elem->id;
 260         }
 261
 262         for (i = 0; i < loop_len; i++) {
 263                 if (list[i] == id)
 264                         return false;
 265         }
 266
 267         return true;
 268 }
 269 EXPORT_SYMBOL(cfg80211_is_element_inherited);
 270
 271 static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
 272                                   const u8 *subelement, size_t subie_len,
 273                                   u8 *new_ie, gfp_t gfp)
 274 {
 275         u8 *pos, *tmp;
 276         const u8 *tmp_old, *tmp_new;
 277         const struct element *non_inherit_elem;
 278         u8 *sub_copy;
 279
 280         /* copy subelement as we need to change its content to
 281          * mark an ie after it is processed.
 282          */
 283         sub_copy = kmemdup(subelement, subie_len, gfp);
 284         if (!sub_copy)
 285                 return 0;
 286
 287         pos = &new_ie[0];
 288
 289         /* set new ssid */
 290         tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
 291         if (tmp_new) {
 292                 memcpy(pos, tmp_new, tmp_new[1] + 2);
 293                 pos += (tmp_new[1] + 2);
 294         }
 295
 296         /* get non inheritance list if exists */
 297         non_inherit_elem =
 298                 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
 299                                        sub_copy, subie_len);
 300
 301         /* go through IEs in ie (skip SSID) and subelement,
 302          * merge them into new_ie
 303          */
 304         tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
 305         tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
 306
 307         while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
 308                 if (tmp_old[0] == 0) {
 309                         tmp_old++;
 310                         continue;
 311                 }
 312
 313                 if (tmp_old[0] == WLAN_EID_EXTENSION)
 314                         tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
 315                                                          subie_len);
 316                 else
 317                         tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
 318                                                      subie_len);
 319
 320                 if (!tmp) {
 321                         const struct element *old_elem = (void *)tmp_old;
 322
 323                         /* ie in old ie but not in subelement */
 324                         if (cfg80211_is_element_inherited(old_elem,
 325                                                           non_inherit_elem)) {
 326                                 memcpy(pos, tmp_old, tmp_old[1] + 2);
 327                                 pos += tmp_old[1] + 2;
 328                         }
 329                 } else {
 330                         /* ie in transmitting ie also in subelement,
 331                          * copy from subelement and flag the ie in subelement
 332                          * as copied (by setting eid field to WLAN_EID_SSID,
 333                          * which is skipped anyway).
 334                          * For vendor ie, compare OUI + type + subType to
 335                          * determine if they are the same ie.
 336                          */
 337                         if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
 338                                 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
 339                                         /* same vendor ie, copy from
 340                                          * subelement
 341                                          */
 342                                         memcpy(pos, tmp, tmp[1] + 2);
 343                                         pos += tmp[1] + 2;
 344                                         tmp[0] = WLAN_EID_SSID;
 345                                 } else {
 346                                         memcpy(pos, tmp_old, tmp_old[1] + 2);
 347                                         pos += tmp_old[1] + 2;
 348                                 }
 349                         } else {
 350                                 /* copy ie from subelement into new ie */
 351                                 memcpy(pos, tmp, tmp[1] + 2);
 352                                 pos += tmp[1] + 2;
 353                                 tmp[0] = WLAN_EID_SSID;
 354                         }
 355                 }
 356
 357                 if (tmp_old + tmp_old[1] + 2 - ie == ielen)
 358                         break;
 359
 360                 tmp_old += tmp_old[1] + 2;
 361         }
 362
 363         /* go through subelement again to check if there is any ie not
 364          * copied to new ie, skip ssid, capability, bssid-index ie
 365          */
 366         tmp_new = sub_copy;
 367         while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
 368                 if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
 369                       tmp_new[0] == WLAN_EID_SSID)) {
 370                         memcpy(pos, tmp_new, tmp_new[1] + 2);
 371                         pos += tmp_new[1] + 2;
 372                 }
 373                 if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
 374                         break;
 375                 tmp_new += tmp_new[1] + 2;
 376         }
 377
 378         kfree(sub_copy);
 379         return pos - new_ie;
 380 }
 381
 382 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
 383                    const u8 *ssid, size_t ssid_len)
 384 {
 385         const struct cfg80211_bss_ies *ies;
 386         const struct element *ssid_elem;
 387
 388         if (bssid && !ether_addr_equal(a->bssid, bssid))
 389                 return false;
 390
 391         if (!ssid)
 392                 return true;
 393
 394         ies = rcu_access_pointer(a->ies);
 395         if (!ies)
 396                 return false;
 397         ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
 398         if (!ssid_elem)
 399                 return false;
 400         if (ssid_elem->datalen != ssid_len)
 401                 return false;
 402         return memcmp(ssid_elem->data, ssid, ssid_len) == 0;
 403 }
 404
 405 static int
 406 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
 407                            struct cfg80211_bss *nontrans_bss)
 408 {
 409         const u8 *ssid;
 410         size_t ssid_len;
 411         struct cfg80211_bss *bss = NULL;
 412
 413         rcu_read_lock();
 414         ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
 415         if (!ssid) {
 416                 rcu_read_unlock();
 417                 return -EINVAL;
 418         }
 419         ssid_len = ssid[1];
 420         ssid = ssid + 2;
 421
 422         /* check if nontrans_bss is in the list */
 423         list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
 424                 if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len)) {
 425                         rcu_read_unlock();
 426                         return 0;
 427                 }
 428         }
 429
 430         rcu_read_unlock();
 431
 432         /* add to the list */
 433         list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
 434         return 0;
 435 }
 436
 437 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
 438                                   unsigned long expire_time)
 439 {
 440         struct cfg80211_internal_bss *bss, *tmp;
 441         bool expired = false;
 442
 443         lockdep_assert_held(&rdev->bss_lock);
 444
 445         list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
 446                 if (atomic_read(&bss->hold))
 447                         continue;
 448                 if (!time_after(expire_time, bss->ts))
 449                         continue;
 450
 451                 if (__cfg80211_unlink_bss(rdev, bss))
 452                         expired = true;
 453         }
 454
 455         if (expired)
 456                 rdev->bss_generation++;
 457 }
 458
 459 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
 460 {
 461         struct cfg80211_internal_bss *bss, *oldest = NULL;
 462         bool ret;
 463
 464         lockdep_assert_held(&rdev->bss_lock);
 465
 466         list_for_each_entry(bss, &rdev->bss_list, list) {
 467                 if (atomic_read(&bss->hold))
 468                         continue;
 469
 470                 if (!list_empty(&bss->hidden_list) &&
 471                     !bss->pub.hidden_beacon_bss)
 472                         continue;
 473
 474                 if (oldest && time_before(oldest->ts, bss->ts))
 475                         continue;
 476                 oldest = bss;
 477         }
 478
 479         if (WARN_ON(!oldest))
 480                 return false;
 481
 482         /*
 483          * The callers make sure to increase rdev->bss_generation if anything
 484          * gets removed (and a new entry added), so there's no need to also do
 485          * it here.
 486          */
 487
 488         ret = __cfg80211_unlink_bss(rdev, oldest);
 489         WARN_ON(!ret);
 490         return ret;
 491 }
 492
 493 static u8 cfg80211_parse_bss_param(u8 data,
 494                                    struct cfg80211_colocated_ap *coloc_ap)
 495 {
 496         coloc_ap->oct_recommended =
 497                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
 498         coloc_ap->same_ssid =
 499                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
 500         coloc_ap->multi_bss =
 501                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
 502         coloc_ap->transmitted_bssid =
 503                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
 504         coloc_ap->unsolicited_probe =
 505                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
 506         coloc_ap->colocated_ess =
 507                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
 508
 509         return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
 510 }
 511
 512 static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
 513                                     const struct element **elem, u32 *s_ssid)
 514 {
 515
 516         *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
 517         if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
 518                 return -EINVAL;
 519
 520         *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
 521         return 0;
 522 }
 523
 524 static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
 525 {
 526         struct cfg80211_colocated_ap *ap, *tmp_ap;
 527
 528         list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
 529                 list_del(&ap->list);
 530                 kfree(ap);
 531         }
 532 }
 533
 534 static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
 535                                   const u8 *pos, u8 length,
 536                                   const struct element *ssid_elem,
 537                                   int s_ssid_tmp)
 538 {
 539         /* skip the TBTT offset */
 540         pos++;
 541
 542         memcpy(entry->bssid, pos, ETH_ALEN);
 543         pos += ETH_ALEN;
 544
 545         if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM) {
 546                 memcpy(&entry->short_ssid, pos,
 547                        sizeof(entry->short_ssid));
 548                 entry->short_ssid_valid = true;
 549                 pos += 4;
 550         }
 551
 552         /* skip non colocated APs */
 553         if (!cfg80211_parse_bss_param(*pos, entry))
 554                 return -EINVAL;
 555         pos++;
 556
 557         if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM) {
 558                 /*
 559                  * no information about the short ssid. Consider the entry valid
 560                  * for now. It would later be dropped in case there are explicit
 561                  * SSIDs that need to be matched
 562                  */
 563                 if (!entry->same_ssid)
 564                         return 0;
 565         }
 566
 567         if (entry->same_ssid) {
 568                 entry->short_ssid = s_ssid_tmp;
 569                 entry->short_ssid_valid = true;
 570
 571                 /*
 572                  * This is safe because we validate datalen in
 573                  * cfg80211_parse_colocated_ap(), before calling this
 574                  * function.
 575                  */
 576                 memcpy(&entry->ssid, &ssid_elem->data,
 577                        ssid_elem->datalen);
 578                 entry->ssid_len = ssid_elem->datalen;
 579         }
 580         return 0;
 581 }
 582
 583 static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
 584                                        struct list_head *list)
 585 {
 586         struct ieee80211_neighbor_ap_info *ap_info;
 587         const struct element *elem, *ssid_elem;
 588         const u8 *pos, *end;
 589         u32 s_ssid_tmp;
 590         int n_coloc = 0, ret;
 591         LIST_HEAD(ap_list);
 592
 593         elem = cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT, ies->data,
 594                                   ies->len);
 595         if (!elem)
 596                 return 0;
 597
 598         pos = elem->data;
 599         end = pos + elem->datalen;
 600
 601         ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
 602         if (ret)
 603                 return ret;
 604
 605         /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
 606         while (pos + sizeof(*ap_info) <= end) {
 607                 enum nl80211_band band;
 608                 int freq;
 609                 u8 length, i, count;
 610
 611                 ap_info = (void *)pos;
 612                 count = u8_get_bits(ap_info->tbtt_info_hdr,
 613                                     IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
 614                 length = ap_info->tbtt_info_len;
 615
 616                 pos += sizeof(*ap_info);
 617
 618                 if (!ieee80211_operating_class_to_band(ap_info->op_class,
 619                                                        &band))
 620                         break;
 621
 622                 freq = ieee80211_channel_to_frequency(ap_info->channel, band);
 623
 624                 if (end - pos < count * length)
 625                         break;
 626
 627                 /*
 628                  * TBTT info must include bss param + BSSID +
 629                  * (short SSID or same_ssid bit to be set).
 630                  * ignore other options, and move to the
 631                  * next AP info
 632                  */
 633                 if (band != NL80211_BAND_6GHZ ||
 634                     (length != IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM &&
 635                      length < IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM)) {
 636                         pos += count * length;
 637                         continue;
 638                 }
 639
 640                 for (i = 0; i < count; i++) {
 641                         struct cfg80211_colocated_ap *entry;
 642
 643                         entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
 644                                         GFP_ATOMIC);
 645
 646                         if (!entry)
 647                                 break;
 648
 649                         entry->center_freq = freq;
 650
 651                         if (!cfg80211_parse_ap_info(entry, pos, length,
 652                                                     ssid_elem, s_ssid_tmp)) {
 653                                 n_coloc++;
 654                                 list_add_tail(&entry->list, &ap_list);
 655                         } else {
 656                                 kfree(entry);
 657                         }
 658
 659                         pos += length;
 660                 }
 661         }
 662
 663         if (pos != end) {
 664                 cfg80211_free_coloc_ap_list(&ap_list);
 665                 return 0;
 666         }
 667
 668         list_splice_tail(&ap_list, list);
 669         return n_coloc;
 670 }
 671
 672 static  void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
 673                                         struct ieee80211_channel *chan,
 674                                         bool add_to_6ghz)
 675 {
 676         int i;
 677         u32 n_channels = request->n_channels;
 678         struct cfg80211_scan_6ghz_params *params =
 679                 &request->scan_6ghz_params[request->n_6ghz_params];
 680
 681         for (i = 0; i < n_channels; i++) {
 682                 if (request->channels[i] == chan) {
 683                         if (add_to_6ghz)
 684                                 params->channel_idx = i;
 685                         return;
 686                 }
 687         }
 688
 689         request->channels[n_channels] = chan;
 690         if (add_to_6ghz)
 691                 request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
 692                         n_channels;
 693
 694         request->n_channels++;
 695 }
 696
 697 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
 698                                      struct cfg80211_scan_request *request)
 699 {
 700         int i;
 701         u32 s_ssid;
 702
 703         for (i = 0; i < request->n_ssids; i++) {
 704                 /* wildcard ssid in the scan request */
 705                 if (!request->ssids[i].ssid_len)
 706                         return true;
 707
 708                 if (ap->ssid_len &&
 709                     ap->ssid_len == request->ssids[i].ssid_len) {
 710                         if (!memcmp(request->ssids[i].ssid, ap->ssid,
 711                                     ap->ssid_len))
 712                                 return true;
 713                 } else if (ap->short_ssid_valid) {
 714                         s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
 715                                            request->ssids[i].ssid_len);
 716
 717                         if (ap->short_ssid == s_ssid)
 718                                 return true;
 719                 }
 720         }
 721
 722         return false;
 723 }
 724
 725 static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
 726 {
 727         u8 i;
 728         struct cfg80211_colocated_ap *ap;
 729         int n_channels, count = 0, err;
 730         struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
 731         LIST_HEAD(coloc_ap_list);
 732         bool need_scan_psc = true;
 733         const struct ieee80211_sband_iftype_data *iftd;
 734
 735         rdev_req->scan_6ghz = true;
 736
 737         if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
 738                 return -EOPNOTSUPP;
 739
 740         iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
 741                                                rdev_req->wdev->iftype);
 742         if (!iftd || !iftd->he_cap.has_he)
 743                 return -EOPNOTSUPP;
 744
 745         n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
 746
 747         if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
 748                 struct cfg80211_internal_bss *intbss;
 749
 750                 spin_lock_bh(&rdev->bss_lock);
 751                 list_for_each_entry(intbss, &rdev->bss_list, list) {
 752                         struct cfg80211_bss *res = &intbss->pub;
 753                         const struct cfg80211_bss_ies *ies;
 754
 755                         ies = rcu_access_pointer(res->ies);
 756                         count += cfg80211_parse_colocated_ap(ies,
 757                                                              &coloc_ap_list);
 758                 }
 759                 spin_unlock_bh(&rdev->bss_lock);
 760         }
 761
 762         request = kzalloc(struct_size(request, channels, n_channels) +
 763                           sizeof(*request->scan_6ghz_params) * count +
 764                           sizeof(*request->ssids) * rdev_req->n_ssids,
 765                           GFP_KERNEL);
 766         if (!request) {
 767                 cfg80211_free_coloc_ap_list(&coloc_ap_list);
 768                 return -ENOMEM;
 769         }
 770
 771         *request = *rdev_req;
 772         request->n_channels = 0;
 773         request->scan_6ghz_params =
 774                 (void *)&request->channels[n_channels];
 775
 776         /*
 777          * PSC channels should not be scanned in case of direct scan with 1 SSID
 778          * and at least one of the reported co-located APs with same SSID
 779          * indicating that all APs in the same ESS are co-located
 780          */
 781         if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
 782                 list_for_each_entry(ap, &coloc_ap_list, list) {
 783                         if (ap->colocated_ess &&
 784                             cfg80211_find_ssid_match(ap, request)) {
 785                                 need_scan_psc = false;
 786                                 break;
 787                         }
 788                 }
 789         }
 790
 791         /*
 792          * add to the scan request the channels that need to be scanned
 793          * regardless of the collocated APs (PSC channels or all channels
 794          * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
 795          */
 796         for (i = 0; i < rdev_req->n_channels; i++) {
 797                 if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
 798                     ((need_scan_psc &&
 799                       cfg80211_channel_is_psc(rdev_req->channels[i])) ||
 800                      !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
 801                         cfg80211_scan_req_add_chan(request,
 802                                                    rdev_req->channels[i],
 803                                                    false);
 804                 }
 805         }
 806
 807         if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
 808                 goto skip;
 809
 810         list_for_each_entry(ap, &coloc_ap_list, list) {
 811                 bool found = false;
 812                 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
 813                         &request->scan_6ghz_params[request->n_6ghz_params];
 814                 struct ieee80211_channel *chan =
 815                         ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
 816
 817                 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
 818                         continue;
 819
 820                 for (i = 0; i < rdev_req->n_channels; i++) {
 821                         if (rdev_req->channels[i] == chan)
 822                                 found = true;
 823                 }
 824
 825                 if (!found)
 826                         continue;
 827
 828                 if (request->n_ssids > 0 &&
 829                     !cfg80211_find_ssid_match(ap, request))
 830                         continue;
 831
 832                 cfg80211_scan_req_add_chan(request, chan, true);
 833                 memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
 834                 scan_6ghz_params->short_ssid = ap->short_ssid;
 835                 scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
 836                 scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
 837
 838                 /*
 839                  * If a PSC channel is added to the scan and 'need_scan_psc' is
 840                  * set to false, then all the APs that the scan logic is
 841                  * interested with on the channel are collocated and thus there
 842                  * is no need to perform the initial PSC channel listen.
 843                  */
 844                 if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
 845                         scan_6ghz_params->psc_no_listen = true;
 846
 847                 request->n_6ghz_params++;
 848         }
 849
 850 skip:
 851         cfg80211_free_coloc_ap_list(&coloc_ap_list);
 852
 853         if (request->n_channels) {
 854                 struct cfg80211_scan_request *old = rdev->int_scan_req;
 855                 rdev->int_scan_req = request;
 856
 857                 /*
 858                  * Add the ssids from the parent scan request to the new scan
 859                  * request, so the driver would be able to use them in its
 860                  * probe requests to discover hidden APs on PSC channels.
 861                  */
 862                 request->ssids = (void *)&request->channels[request->n_channels];
 863                 request->n_ssids = rdev_req->n_ssids;
 864                 memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) *
 865                        request->n_ssids);
 866
 867                 /*
 868                  * If this scan follows a previous scan, save the scan start
 869                  * info from the first part of the scan
 870                  */
 871                 if (old)
 872                         rdev->int_scan_req->info = old->info;
 873
 874                 err = rdev_scan(rdev, request);
 875                 if (err) {
 876                         rdev->int_scan_req = old;
 877                         kfree(request);
 878                 } else {
 879                         kfree(old);
 880                 }
 881
 882                 return err;
 883         }
 884
 885         kfree(request);
 886         return -EINVAL;
 887 }
 888
 889 int cfg80211_scan(struct cfg80211_registered_device *rdev)
 890 {
 891         struct cfg80211_scan_request *request;
 892         struct cfg80211_scan_request *rdev_req = rdev->scan_req;
 893         u32 n_channels = 0, idx, i;
 894
 895         if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
 896                 return rdev_scan(rdev, rdev_req);
 897
 898         for (i = 0; i < rdev_req->n_channels; i++) {
 899                 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
 900                         n_channels++;
 901         }
 902
 903         if (!n_channels)
 904                 return cfg80211_scan_6ghz(rdev);
 905
 906         request = kzalloc(struct_size(request, channels, n_channels),
 907                           GFP_KERNEL);
 908         if (!request)
 909                 return -ENOMEM;
 910
 911         *request = *rdev_req;
 912         request->n_channels = n_channels;
 913
 914         for (i = idx = 0; i < rdev_req->n_channels; i++) {
 915                 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
 916                         request->channels[idx++] = rdev_req->channels[i];
 917         }
 918
 919         rdev_req->scan_6ghz = false;
 920         rdev->int_scan_req = request;
 921         return rdev_scan(rdev, request);
 922 }
 923
 924 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
 925                            bool send_message)
 926 {
 927         struct cfg80211_scan_request *request, *rdev_req;
 928         struct wireless_dev *wdev;
 929         struct sk_buff *msg;
 930 #ifdef CONFIG_CFG80211_WEXT
 931         union iwreq_data wrqu;
 932 #endif
 933
 934         lockdep_assert_held(&rdev->wiphy.mtx);
 935
 936         if (rdev->scan_msg) {
 937                 nl80211_send_scan_msg(rdev, rdev->scan_msg);
 938                 rdev->scan_msg = NULL;
 939                 return;
 940         }
 941
 942         rdev_req = rdev->scan_req;
 943         if (!rdev_req)
 944                 return;
 945
 946         wdev = rdev_req->wdev;
 947         request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
 948
 949         if (wdev_running(wdev) &&
 950             (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
 951             !rdev_req->scan_6ghz && !request->info.aborted &&
 952             !cfg80211_scan_6ghz(rdev))
 953                 return;
 954
 955         /*
 956          * This must be before sending the other events!
 957          * Otherwise, wpa_supplicant gets completely confused with
 958          * wext events.
 959          */
 960         if (wdev->netdev)
 961                 cfg80211_sme_scan_done(wdev->netdev);
 962
 963         if (!request->info.aborted &&
 964             request->flags & NL80211_SCAN_FLAG_FLUSH) {
 965                 /* flush entries from previous scans */
 966                 spin_lock_bh(&rdev->bss_lock);
 967                 __cfg80211_bss_expire(rdev, request->scan_start);
 968                 spin_unlock_bh(&rdev->bss_lock);
 969         }
 970
 971         msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
 972
 973 #ifdef CONFIG_CFG80211_WEXT
 974         if (wdev->netdev && !request->info.aborted) {
 975                 memset(&wrqu, 0, sizeof(wrqu));
 976
 977                 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
 978         }
 979 #endif
 980
 981         dev_put(wdev->netdev);
 982
 983         kfree(rdev->int_scan_req);
 984         rdev->int_scan_req = NULL;
 985
 986         kfree(rdev->scan_req);
 987         rdev->scan_req = NULL;
 988
 989         if (!send_message)
 990                 rdev->scan_msg = msg;
 991         else
 992                 nl80211_send_scan_msg(rdev, msg);
 993 }
 994
 995 void __cfg80211_scan_done(struct work_struct *wk)
 996 {
 997         struct cfg80211_registered_device *rdev;
 998
 999         rdev = container_of(wk, struct cfg80211_registered_device,
1000                             scan_done_wk);
1001
1002         wiphy_lock(&rdev->wiphy);
1003         ___cfg80211_scan_done(rdev, true);
1004         wiphy_unlock(&rdev->wiphy);
1005 }
1006
1007 void cfg80211_scan_done(struct cfg80211_scan_request *request,
1008                         struct cfg80211_scan_info *info)
1009 {
1010         struct cfg80211_scan_info old_info = request->info;
1011
1012         trace_cfg80211_scan_done(request, info);
1013         WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
1014                 request != wiphy_to_rdev(request->wiphy)->int_scan_req);
1015
1016         request->info = *info;
1017
1018         /*
1019          * In case the scan is split, the scan_start_tsf and tsf_bssid should
1020          * be of the first part. In such a case old_info.scan_start_tsf should
1021          * be non zero.
1022          */
1023         if (request->scan_6ghz && old_info.scan_start_tsf) {
1024                 request->info.scan_start_tsf = old_info.scan_start_tsf;
1025                 memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
1026                        sizeof(request->info.tsf_bssid));
1027         }
1028
1029         request->notified = true;
1030         queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
1031 }
1032 EXPORT_SYMBOL(cfg80211_scan_done);
1033
1034 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
1035                                  struct cfg80211_sched_scan_request *req)
1036 {
1037         lockdep_assert_held(&rdev->wiphy.mtx);
1038
1039         list_add_rcu(&req->list, &rdev->sched_scan_req_list);
1040 }
1041
1042 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
1043                                         struct cfg80211_sched_scan_request *req)
1044 {
1045         lockdep_assert_held(&rdev->wiphy.mtx);
1046
1047         list_del_rcu(&req->list);
1048         kfree_rcu(req, rcu_head);
1049 }
1050
1051 static struct cfg80211_sched_scan_request *
1052 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
1053 {
1054         struct cfg80211_sched_scan_request *pos;
1055
1056         list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
1057                                 lockdep_is_held(&rdev->wiphy.mtx)) {
1058                 if (pos->reqid == reqid)
1059                         return pos;
1060         }
1061         return NULL;
1062 }
1063
1064 /*
1065  * Determines if a scheduled scan request can be handled. When a legacy
1066  * scheduled scan is running no other scheduled scan is allowed regardless
1067  * whether the request is for legacy or multi-support scan. When a multi-support
1068  * scheduled scan is running a request for legacy scan is not allowed. In this
1069  * case a request for multi-support scan can be handled if resources are
1070  * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
1071  */
1072 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
1073                                      bool want_multi)
1074 {
1075         struct cfg80211_sched_scan_request *pos;
1076         int i = 0;
1077
1078         list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
1079                 /* request id zero means legacy in progress */
1080                 if (!i && !pos->reqid)
1081                         return -EINPROGRESS;
1082                 i++;
1083         }
1084
1085         if (i) {
1086                 /* no legacy allowed when multi request(s) are active */
1087                 if (!want_multi)
1088                         return -EINPROGRESS;
1089
1090                 /* resource limit reached */
1091                 if (i == rdev->wiphy.max_sched_scan_reqs)
1092                         return -ENOSPC;
1093         }
1094         return 0;
1095 }
1096
1097 void cfg80211_sched_scan_results_wk(struct work_struct *work)
1098 {
1099         struct cfg80211_registered_device *rdev;
1100         struct cfg80211_sched_scan_request *req, *tmp;
1101
1102         rdev = container_of(work, struct cfg80211_registered_device,
1103                            sched_scan_res_wk);
1104
1105         wiphy_lock(&rdev->wiphy);
1106         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
1107                 if (req->report_results) {
1108                         req->report_results = false;
1109                         if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
1110                                 /* flush entries from previous scans */
1111                                 spin_lock_bh(&rdev->bss_lock);
1112                                 __cfg80211_bss_expire(rdev, req->scan_start);
1113                                 spin_unlock_bh(&rdev->bss_lock);
1114                                 req->scan_start = jiffies;
1115                         }
1116                         nl80211_send_sched_scan(req,
1117                                                 NL80211_CMD_SCHED_SCAN_RESULTS);
1118                 }
1119         }
1120         wiphy_unlock(&rdev->wiphy);
1121 }
1122
1123 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
1124 {
1125         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1126         struct cfg80211_sched_scan_request *request;
1127
1128         trace_cfg80211_sched_scan_results(wiphy, reqid);
1129         /* ignore if we're not scanning */
1130
1131         rcu_read_lock();
1132         request = cfg80211_find_sched_scan_req(rdev, reqid);
1133         if (request) {
1134                 request->report_results = true;
1135                 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
1136         }
1137         rcu_read_unlock();
1138 }
1139 EXPORT_SYMBOL(cfg80211_sched_scan_results);
1140
1141 void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid)
1142 {
1143         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1144
1145         lockdep_assert_held(&wiphy->mtx);
1146
1147         trace_cfg80211_sched_scan_stopped(wiphy, reqid);
1148
1149         __cfg80211_stop_sched_scan(rdev, reqid, true);
1150 }
1151 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
1152
1153 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
1154 {
1155         wiphy_lock(wiphy);
1156         cfg80211_sched_scan_stopped_locked(wiphy, reqid);
1157         wiphy_unlock(wiphy);
1158 }
1159 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
1160
1161 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
1162                                  struct cfg80211_sched_scan_request *req,
1163                                  bool driver_initiated)
1164 {
1165         lockdep_assert_held(&rdev->wiphy.mtx);
1166
1167         if (!driver_initiated) {
1168                 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
1169                 if (err)
1170                         return err;
1171         }
1172
1173         nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
1174
1175         cfg80211_del_sched_scan_req(rdev, req);
1176
1177         return 0;
1178 }
1179
1180 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
1181                                u64 reqid, bool driver_initiated)
1182 {
1183         struct cfg80211_sched_scan_request *sched_scan_req;
1184
1185         lockdep_assert_held(&rdev->wiphy.mtx);
1186
1187         sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
1188         if (!sched_scan_req)
1189                 return -ENOENT;
1190
1191         return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
1192                                             driver_initiated);
1193 }
1194
1195 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
1196                       unsigned long age_secs)
1197 {
1198         struct cfg80211_internal_bss *bss;
1199         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
1200
1201         spin_lock_bh(&rdev->bss_lock);
1202         list_for_each_entry(bss, &rdev->bss_list, list)
1203                 bss->ts -= age_jiffies;
1204         spin_unlock_bh(&rdev->bss_lock);
1205 }
1206
1207 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
1208 {
1209         __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
1210 }
1211
1212 void cfg80211_bss_flush(struct wiphy *wiphy)
1213 {
1214         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1215
1216         spin_lock_bh(&rdev->bss_lock);
1217         __cfg80211_bss_expire(rdev, jiffies);
1218         spin_unlock_bh(&rdev->bss_lock);
1219 }
1220 EXPORT_SYMBOL(cfg80211_bss_flush);
1221
1222 const struct element *
1223 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
1224                          const u8 *match, unsigned int match_len,
1225                          unsigned int match_offset)
1226 {
1227         const struct element *elem;
1228
1229         for_each_element_id(elem, eid, ies, len) {
1230                 if (elem->datalen >= match_offset + match_len &&
1231                     !memcmp(elem->data + match_offset, match, match_len))
1232                         return elem;
1233         }
1234
1235         return NULL;
1236 }
1237 EXPORT_SYMBOL(cfg80211_find_elem_match);
1238
1239 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
1240                                                 const u8 *ies,
1241                                                 unsigned int len)
1242 {
1243         const struct element *elem;
1244         u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
1245         int match_len = (oui_type < 0) ? 3 : sizeof(match);
1246
1247         if (WARN_ON(oui_type > 0xff))
1248                 return NULL;
1249
1250         elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
1251                                         match, match_len, 0);
1252
1253         if (!elem || elem->datalen < 4)
1254                 return NULL;
1255
1256         return elem;
1257 }
1258 EXPORT_SYMBOL(cfg80211_find_vendor_elem);
1259
1260 /**
1261  * enum bss_compare_mode - BSS compare mode
1262  * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
1263  * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
1264  * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
1265  */
1266 enum bss_compare_mode {
1267         BSS_CMP_REGULAR,
1268         BSS_CMP_HIDE_ZLEN,
1269         BSS_CMP_HIDE_NUL,
1270 };
1271
1272 static int cmp_bss(struct cfg80211_bss *a,
1273                    struct cfg80211_bss *b,
1274                    enum bss_compare_mode mode)
1275 {
1276         const struct cfg80211_bss_ies *a_ies, *b_ies;
1277         const u8 *ie1 = NULL;
1278         const u8 *ie2 = NULL;
1279         int i, r;
1280
1281         if (a->channel != b->channel)
1282                 return b->channel->center_freq - a->channel->center_freq;
1283
1284         a_ies = rcu_access_pointer(a->ies);
1285         if (!a_ies)
1286                 return -1;
1287         b_ies = rcu_access_pointer(b->ies);
1288         if (!b_ies)
1289                 return 1;
1290
1291         if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
1292                 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1293                                        a_ies->data, a_ies->len);
1294         if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
1295                 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1296                                        b_ies->data, b_ies->len);
1297         if (ie1 && ie2) {
1298                 int mesh_id_cmp;
1299
1300                 if (ie1[1] == ie2[1])
1301                         mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1302                 else
1303                         mesh_id_cmp = ie2[1] - ie1[1];
1304
1305                 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1306                                        a_ies->data, a_ies->len);
1307                 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1308                                        b_ies->data, b_ies->len);
1309                 if (ie1 && ie2) {
1310                         if (mesh_id_cmp)
1311                                 return mesh_id_cmp;
1312                         if (ie1[1] != ie2[1])
1313                                 return ie2[1] - ie1[1];
1314                         return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1315                 }
1316         }
1317
1318         r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
1319         if (r)
1320                 return r;
1321
1322         ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
1323         ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
1324
1325         if (!ie1 && !ie2)
1326                 return 0;
1327
1328         /*
1329          * Note that with "hide_ssid", the function returns a match if
1330          * the already-present BSS ("b") is a hidden SSID beacon for
1331          * the new BSS ("a").
1332          */
1333
1334         /* sort missing IE before (left of) present IE */
1335         if (!ie1)
1336                 return -1;
1337         if (!ie2)
1338                 return 1;
1339
1340         switch (mode) {
1341         case BSS_CMP_HIDE_ZLEN:
1342                 /*
1343                  * In ZLEN mode we assume the BSS entry we're
1344                  * looking for has a zero-length SSID. So if
1345                  * the one we're looking at right now has that,
1346                  * return 0. Otherwise, return the difference
1347                  * in length, but since we're looking for the
1348                  * 0-length it's really equivalent to returning
1349                  * the length of the one we're looking at.
1350                  *
1351                  * No content comparison is needed as we assume
1352                  * the content length is zero.
1353                  */
1354                 return ie2[1];
1355         case BSS_CMP_REGULAR:
1356         default:
1357                 /* sort by length first, then by contents */
1358                 if (ie1[1] != ie2[1])
1359                         return ie2[1] - ie1[1];
1360                 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1361         case BSS_CMP_HIDE_NUL:
1362                 if (ie1[1] != ie2[1])
1363                         return ie2[1] - ie1[1];
1364                 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
1365                 for (i = 0; i < ie2[1]; i++)
1366                         if (ie2[i + 2])
1367                                 return -1;
1368                 return 0;
1369         }
1370 }
1371
1372 static bool cfg80211_bss_type_match(u16 capability,
1373                                     enum nl80211_band band,
1374                                     enum ieee80211_bss_type bss_type)
1375 {
1376         bool ret = true;
1377         u16 mask, val;
1378
1379         if (bss_type == IEEE80211_BSS_TYPE_ANY)
1380                 return ret;
1381
1382         if (band == NL80211_BAND_60GHZ) {
1383                 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
1384                 switch (bss_type) {
1385                 case IEEE80211_BSS_TYPE_ESS:
1386                         val = WLAN_CAPABILITY_DMG_TYPE_AP;
1387                         break;
1388                 case IEEE80211_BSS_TYPE_PBSS:
1389                         val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
1390                         break;
1391                 case IEEE80211_BSS_TYPE_IBSS:
1392                         val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
1393                         break;
1394                 default:
1395                         return false;
1396                 }
1397         } else {
1398                 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
1399                 switch (bss_type) {
1400                 case IEEE80211_BSS_TYPE_ESS:
1401                         val = WLAN_CAPABILITY_ESS;
1402                         break;
1403                 case IEEE80211_BSS_TYPE_IBSS:
1404                         val = WLAN_CAPABILITY_IBSS;
1405                         break;
1406                 case IEEE80211_BSS_TYPE_MBSS:
1407                         val = 0;
1408                         break;
1409                 default:
1410                         return false;
1411                 }
1412         }
1413
1414         ret = ((capability & mask) == val);
1415         return ret;
1416 }
1417
1418 /* Returned bss is reference counted and must be cleaned up appropriately. */
1419 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
1420                                       struct ieee80211_channel *channel,
1421                                       const u8 *bssid,
1422                                       const u8 *ssid, size_t ssid_len,
1423                                       enum ieee80211_bss_type bss_type,
1424                                       enum ieee80211_privacy privacy)
1425 {
1426         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1427         struct cfg80211_internal_bss *bss, *res = NULL;
1428         unsigned long now = jiffies;
1429         int bss_privacy;
1430
1431         trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
1432                                privacy);
1433
1434         spin_lock_bh(&rdev->bss_lock);
1435
1436         list_for_each_entry(bss, &rdev->bss_list, list) {
1437                 if (!cfg80211_bss_type_match(bss->pub.capability,
1438                                              bss->pub.channel->band, bss_type))
1439                         continue;
1440
1441                 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
1442                 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
1443                     (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
1444                         continue;
1445                 if (channel && bss->pub.channel != channel)
1446                         continue;
1447                 if (!is_valid_ether_addr(bss->pub.bssid))
1448                         continue;
1449                 /* Don't get expired BSS structs */
1450                 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
1451                     !atomic_read(&bss->hold))
1452                         continue;
1453                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
1454                         res = bss;
1455                         bss_ref_get(rdev, res);
1456                         break;
1457                 }
1458         }
1459
1460         spin_unlock_bh(&rdev->bss_lock);
1461         if (!res)
1462                 return NULL;
1463         trace_cfg80211_return_bss(&res->pub);
1464         return &res->pub;
1465 }
1466 EXPORT_SYMBOL(cfg80211_get_bss);
1467
1468 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
1469                           struct cfg80211_internal_bss *bss)
1470 {
1471         struct rb_node **p = &rdev->bss_tree.rb_node;
1472         struct rb_node *parent = NULL;
1473         struct cfg80211_internal_bss *tbss;
1474         int cmp;
1475
1476         while (*p) {
1477                 parent = *p;
1478                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
1479
1480                 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
1481
1482                 if (WARN_ON(!cmp)) {
1483                         /* will sort of leak this BSS */
1484                         return;
1485                 }
1486
1487                 if (cmp < 0)
1488                         p = &(*p)->rb_left;
1489                 else
1490                         p = &(*p)->rb_right;
1491         }
1492
1493         rb_link_node(&bss->rbn, parent, p);
1494         rb_insert_color(&bss->rbn, &rdev->bss_tree);
1495 }
1496
1497 static struct cfg80211_internal_bss *
1498 rb_find_bss(struct cfg80211_registered_device *rdev,
1499             struct cfg80211_internal_bss *res,
1500             enum bss_compare_mode mode)
1501 {
1502         struct rb_node *n = rdev->bss_tree.rb_node;
1503         struct cfg80211_internal_bss *bss;
1504         int r;
1505
1506         while (n) {
1507                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1508                 r = cmp_bss(&res->pub, &bss->pub, mode);
1509
1510                 if (r == 0)
1511                         return bss;
1512                 else if (r < 0)
1513                         n = n->rb_left;
1514                 else
1515                         n = n->rb_right;
1516         }
1517
1518         return NULL;
1519 }
1520
1521 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1522                                    struct cfg80211_internal_bss *new)
1523 {
1524         const struct cfg80211_bss_ies *ies;
1525         struct cfg80211_internal_bss *bss;
1526         const u8 *ie;
1527         int i, ssidlen;
1528         u8 fold = 0;
1529         u32 n_entries = 0;
1530
1531         ies = rcu_access_pointer(new->pub.beacon_ies);
1532         if (WARN_ON(!ies))
1533                 return false;
1534
1535         ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1536         if (!ie) {
1537                 /* nothing to do */
1538                 return true;
1539         }
1540
1541         ssidlen = ie[1];
1542         for (i = 0; i < ssidlen; i++)
1543                 fold |= ie[2 + i];
1544
1545         if (fold) {
1546                 /* not a hidden SSID */
1547                 return true;
1548         }
1549
1550         /* This is the bad part ... */
1551
1552         list_for_each_entry(bss, &rdev->bss_list, list) {
1553                 /*
1554                  * we're iterating all the entries anyway, so take the
1555                  * opportunity to validate the list length accounting
1556                  */
1557                 n_entries++;
1558
1559                 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1560                         continue;
1561                 if (bss->pub.channel != new->pub.channel)
1562                         continue;
1563                 if (bss->pub.scan_width != new->pub.scan_width)
1564                         continue;
1565                 if (rcu_access_pointer(bss->pub.beacon_ies))
1566                         continue;
1567                 ies = rcu_access_pointer(bss->pub.ies);
1568                 if (!ies)
1569                         continue;
1570                 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1571                 if (!ie)
1572                         continue;
1573                 if (ssidlen && ie[1] != ssidlen)
1574                         continue;
1575                 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1576                         continue;
1577                 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1578                         list_del(&bss->hidden_list);
1579                 /* combine them */
1580                 list_add(&bss->hidden_list, &new->hidden_list);
1581                 bss->pub.hidden_beacon_bss = &new->pub;
1582                 new->refcount += bss->refcount;
1583                 rcu_assign_pointer(bss->pub.beacon_ies,
1584                                    new->pub.beacon_ies);
1585         }
1586
1587         WARN_ONCE(n_entries != rdev->bss_entries,
1588                   "rdev bss entries[%d]/list[len:%d] corruption\n",
1589                   rdev->bss_entries, n_entries);
1590
1591         return true;
1592 }
1593
1594 struct cfg80211_non_tx_bss {
1595         struct cfg80211_bss *tx_bss;
1596         u8 max_bssid_indicator;
1597         u8 bssid_index;
1598 };
1599
1600 static bool
1601 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1602                           struct cfg80211_internal_bss *known,
1603                           struct cfg80211_internal_bss *new,
1604                           bool signal_valid)
1605 {
1606         lockdep_assert_held(&rdev->bss_lock);
1607
1608         /* Update IEs */
1609         if (rcu_access_pointer(new->pub.proberesp_ies)) {
1610                 const struct cfg80211_bss_ies *old;
1611
1612                 old = rcu_access_pointer(known->pub.proberesp_ies);
1613
1614                 rcu_assign_pointer(known->pub.proberesp_ies,
1615                                    new->pub.proberesp_ies);
1616                 /* Override possible earlier Beacon frame IEs */
1617                 rcu_assign_pointer(known->pub.ies,
1618                                    new->pub.proberesp_ies);
1619                 if (old)
1620                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1621         } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1622                 const struct cfg80211_bss_ies *old;
1623                 struct cfg80211_internal_bss *bss;
1624
1625                 if (known->pub.hidden_beacon_bss &&
1626                     !list_empty(&known->hidden_list)) {
1627                         const struct cfg80211_bss_ies *f;
1628
1629                         /* The known BSS struct is one of the probe
1630                          * response members of a group, but we're
1631                          * receiving a beacon (beacon_ies in the new
1632                          * bss is used). This can only mean that the
1633                          * AP changed its beacon from not having an
1634                          * SSID to showing it, which is confusing so
1635                          * drop this information.
1636                          */
1637
1638                         f = rcu_access_pointer(new->pub.beacon_ies);
1639                         kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1640                         return false;
1641                 }
1642
1643                 old = rcu_access_pointer(known->pub.beacon_ies);
1644
1645                 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1646
1647                 /* Override IEs if they were from a beacon before */
1648                 if (old == rcu_access_pointer(known->pub.ies))
1649                         rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1650
1651                 /* Assign beacon IEs to all sub entries */
1652                 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1653                         const struct cfg80211_bss_ies *ies;
1654
1655                         ies = rcu_access_pointer(bss->pub.beacon_ies);
1656                         WARN_ON(ies != old);
1657
1658                         rcu_assign_pointer(bss->pub.beacon_ies,
1659                                            new->pub.beacon_ies);
1660                 }
1661
1662                 if (old)
1663                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1664         }
1665
1666         known->pub.beacon_interval = new->pub.beacon_interval;
1667
1668         /* don't update the signal if beacon was heard on
1669          * adjacent channel.
1670          */
1671         if (signal_valid)
1672                 known->pub.signal = new->pub.signal;
1673         known->pub.capability = new->pub.capability;
1674         known->ts = new->ts;
1675         known->ts_boottime = new->ts_boottime;
1676         known->parent_tsf = new->parent_tsf;
1677         known->pub.chains = new->pub.chains;
1678         memcpy(known->pub.chain_signal, new->pub.chain_signal,
1679                IEEE80211_MAX_CHAINS);
1680         ether_addr_copy(known->parent_bssid, new->parent_bssid);
1681         known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1682         known->pub.bssid_index = new->pub.bssid_index;
1683
1684         return true;
1685 }
1686
1687 /* Returned bss is reference counted and must be cleaned up appropriately. */
1688 struct cfg80211_internal_bss *
1689 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1690                     struct cfg80211_internal_bss *tmp,
1691                     bool signal_valid, unsigned long ts)
1692 {
1693         struct cfg80211_internal_bss *found = NULL;
1694
1695         if (WARN_ON(!tmp->pub.channel))
1696                 return NULL;
1697
1698         tmp->ts = ts;
1699
1700         spin_lock_bh(&rdev->bss_lock);
1701
1702         if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1703                 spin_unlock_bh(&rdev->bss_lock);
1704                 return NULL;
1705         }
1706
1707         found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1708
1709         if (found) {
1710                 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1711                         goto drop;
1712         } else {
1713                 struct cfg80211_internal_bss *new;
1714                 struct cfg80211_internal_bss *hidden;
1715                 struct cfg80211_bss_ies *ies;
1716
1717                 /*
1718                  * create a copy -- the "res" variable that is passed in
1719                  * is allocated on the stack since it's not needed in the
1720                  * more common case of an update
1721                  */
1722                 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1723                               GFP_ATOMIC);
1724                 if (!new) {
1725                         ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1726                         if (ies)
1727                                 kfree_rcu(ies, rcu_head);
1728                         ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1729                         if (ies)
1730                                 kfree_rcu(ies, rcu_head);
1731                         goto drop;
1732                 }
1733                 memcpy(new, tmp, sizeof(*new));
1734                 new->refcount = 1;
1735                 INIT_LIST_HEAD(&new->hidden_list);
1736                 INIT_LIST_HEAD(&new->pub.nontrans_list);
1737
1738                 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1739                         hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1740                         if (!hidden)
1741                                 hidden = rb_find_bss(rdev, tmp,
1742                                                      BSS_CMP_HIDE_NUL);
1743                         if (hidden) {
1744                                 new->pub.hidden_beacon_bss = &hidden->pub;
1745                                 list_add(&new->hidden_list,
1746                                          &hidden->hidden_list);
1747                                 hidden->refcount++;
1748                                 rcu_assign_pointer(new->pub.beacon_ies,
1749                                                    hidden->pub.beacon_ies);
1750                         }
1751                 } else {
1752                         /*
1753                          * Ok so we found a beacon, and don't have an entry. If
1754                          * it's a beacon with hidden SSID, we might be in for an
1755                          * expensive search for any probe responses that should
1756                          * be grouped with this beacon for updates ...
1757                          */
1758                         if (!cfg80211_combine_bsses(rdev, new)) {
1759                                 bss_ref_put(rdev, new);
1760                                 goto drop;
1761                         }
1762                 }
1763
1764                 if (rdev->bss_entries >= bss_entries_limit &&
1765                     !cfg80211_bss_expire_oldest(rdev)) {
1766                         bss_ref_put(rdev, new);
1767                         goto drop;
1768                 }
1769
1770                 /* This must be before the call to bss_ref_get */
1771                 if (tmp->pub.transmitted_bss) {
1772                         struct cfg80211_internal_bss *pbss =
1773                                 container_of(tmp->pub.transmitted_bss,
1774                                              struct cfg80211_internal_bss,
1775                                              pub);
1776
1777                         new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1778                         bss_ref_get(rdev, pbss);
1779                 }
1780
1781                 list_add_tail(&new->list, &rdev->bss_list);
1782                 rdev->bss_entries++;
1783                 rb_insert_bss(rdev, new);
1784                 found = new;
1785         }
1786
1787         rdev->bss_generation++;
1788         bss_ref_get(rdev, found);
1789         spin_unlock_bh(&rdev->bss_lock);
1790
1791         return found;
1792  drop:
1793         spin_unlock_bh(&rdev->bss_lock);
1794         return NULL;
1795 }
1796
1797 int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
1798                                     enum nl80211_band band)
1799 {
1800         const u8 *tmp;
1801         int channel_number = -1;
1802
1803         if (band == NL80211_BAND_S1GHZ) {
1804                 tmp = cfg80211_find_ie(WLAN_EID_S1G_OPERATION, ie, ielen);
1805                 if (tmp && tmp[1] >= sizeof(struct ieee80211_s1g_oper_ie)) {
1806                         struct ieee80211_s1g_oper_ie *s1gop = (void *)(tmp + 2);
1807
1808                         channel_number = s1gop->primary_ch;
1809                 }
1810         } else {
1811                 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1812                 if (tmp && tmp[1] == 1) {
1813                         channel_number = tmp[2];
1814                 } else {
1815                         tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1816                         if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1817                                 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1818
1819                                 channel_number = htop->primary_chan;
1820                         }
1821                 }
1822         }
1823
1824         return channel_number;
1825 }
1826 EXPORT_SYMBOL(cfg80211_get_ies_channel_number);
1827
1828 /*
1829  * Update RX channel information based on the available frame payload
1830  * information. This is mainly for the 2.4 GHz band where frames can be received
1831  * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1832  * element to indicate the current (transmitting) channel, but this might also
1833  * be needed on other bands if RX frequency does not match with the actual
1834  * operating channel of a BSS.
1835  */
1836 static struct ieee80211_channel *
1837 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1838                          struct ieee80211_channel *channel,
1839                          enum nl80211_bss_scan_width scan_width)
1840 {
1841         u32 freq;
1842         int channel_number;
1843         struct ieee80211_channel *alt_channel;
1844
1845         channel_number = cfg80211_get_ies_channel_number(ie, ielen, channel->band);
1846
1847         if (channel_number < 0) {
1848                 /* No channel information in frame payload */
1849                 return channel;
1850         }
1851
1852         freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
1853         alt_channel = ieee80211_get_channel_khz(wiphy, freq);
1854         if (!alt_channel) {
1855                 if (channel->band == NL80211_BAND_2GHZ) {
1856                         /*
1857                          * Better not allow unexpected channels when that could
1858                          * be going beyond the 1-11 range (e.g., discovering
1859                          * BSS on channel 12 when radio is configured for
1860                          * channel 11.
1861                          */
1862                         return NULL;
1863                 }
1864
1865                 /* No match for the payload channel number - ignore it */
1866                 return channel;
1867         }
1868
1869         if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1870             scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1871                 /*
1872                  * Ignore channel number in 5 and 10 MHz channels where there
1873                  * may not be an n:1 or 1:n mapping between frequencies and
1874                  * channel numbers.
1875                  */
1876                 return channel;
1877         }
1878
1879         /*
1880          * Use the channel determined through the payload channel number
1881          * instead of the RX channel reported by the driver.
1882          */
1883         if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1884                 return NULL;
1885         return alt_channel;
1886 }
1887
1888 /* Returned bss is reference counted and must be cleaned up appropriately. */
1889 static struct cfg80211_bss *
1890 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1891                                 struct cfg80211_inform_bss *data,
1892                                 enum cfg80211_bss_frame_type ftype,
1893                                 const u8 *bssid, u64 tsf, u16 capability,
1894                                 u16 beacon_interval, const u8 *ie, size_t ielen,
1895                                 struct cfg80211_non_tx_bss *non_tx_data,
1896                                 gfp_t gfp)
1897 {
1898         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1899         struct cfg80211_bss_ies *ies;
1900         struct ieee80211_channel *channel;
1901         struct cfg80211_internal_bss tmp = {}, *res;
1902         int bss_type;
1903         bool signal_valid;
1904         unsigned long ts;
1905
1906         if (WARN_ON(!wiphy))
1907                 return NULL;
1908
1909         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1910                     (data->signal < 0 || data->signal > 100)))
1911                 return NULL;
1912
1913         channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1914                                            data->scan_width);
1915         if (!channel)
1916                 return NULL;
1917
1918         memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1919         tmp.pub.channel = channel;
1920         tmp.pub.scan_width = data->scan_width;
1921         tmp.pub.signal = data->signal;
1922         tmp.pub.beacon_interval = beacon_interval;
1923         tmp.pub.capability = capability;
1924         tmp.ts_boottime = data->boottime_ns;
1925         tmp.parent_tsf = data->parent_tsf;
1926         ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1927
1928         if (non_tx_data) {
1929                 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1930                 ts = bss_from_pub(non_tx_data->tx_bss)->ts;
1931                 tmp.pub.bssid_index = non_tx_data->bssid_index;
1932                 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1933         } else {
1934                 ts = jiffies;
1935         }
1936
1937         /*
1938          * If we do not know here whether the IEs are from a Beacon or Probe
1939          * Response frame, we need to pick one of the options and only use it
1940          * with the driver that does not provide the full Beacon/Probe Response
1941          * frame. Use Beacon frame pointer to avoid indicating that this should
1942          * override the IEs pointer should we have received an earlier
1943          * indication of Probe Response data.
1944          */
1945         ies = kzalloc(sizeof(*ies) + ielen, gfp);
1946         if (!ies)
1947                 return NULL;
1948         ies->len = ielen;
1949         ies->tsf = tsf;
1950         ies->from_beacon = false;
1951         memcpy(ies->data, ie, ielen);
1952
1953         switch (ftype) {
1954         case CFG80211_BSS_FTYPE_BEACON:
1955                 ies->from_beacon = true;
1956                 fallthrough;
1957         case CFG80211_BSS_FTYPE_UNKNOWN:
1958                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1959                 break;
1960         case CFG80211_BSS_FTYPE_PRESP:
1961                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1962                 break;
1963         }
1964         rcu_assign_pointer(tmp.pub.ies, ies);
1965
1966         signal_valid = data->chan == channel;
1967         res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
1968         if (!res)
1969                 return NULL;
1970
1971         if (channel->band == NL80211_BAND_60GHZ) {
1972                 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1973                 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1974                     bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1975                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1976         } else {
1977                 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1978                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1979         }
1980
1981         if (non_tx_data) {
1982                 /* this is a nontransmitting bss, we need to add it to
1983                  * transmitting bss' list if it is not there
1984                  */
1985                 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1986                                                &res->pub)) {
1987                         if (__cfg80211_unlink_bss(rdev, res))
1988                                 rdev->bss_generation++;
1989                 }
1990         }
1991
1992         trace_cfg80211_return_bss(&res->pub);
1993         /* cfg80211_bss_update gives us a referenced result */
1994         return &res->pub;
1995 }
1996
1997 static const struct element
1998 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1999                                    const struct element *mbssid_elem,
2000                                    const struct element *sub_elem)
2001 {
2002         const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
2003         const struct element *next_mbssid;
2004         const struct element *next_sub;
2005
2006         next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
2007                                          mbssid_end,
2008                                          ielen - (mbssid_end - ie));
2009
2010         /*
2011          * If it is not the last subelement in current MBSSID IE or there isn't
2012          * a next MBSSID IE - profile is complete.
2013         */
2014         if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
2015             !next_mbssid)
2016                 return NULL;
2017
2018         /* For any length error, just return NULL */
2019
2020         if (next_mbssid->datalen < 4)
2021                 return NULL;
2022
2023         next_sub = (void *)&next_mbssid->data[1];
2024
2025         if (next_mbssid->data + next_mbssid->datalen <
2026             next_sub->data + next_sub->datalen)
2027                 return NULL;
2028
2029         if (next_sub->id != 0 || next_sub->datalen < 2)
2030                 return NULL;
2031
2032         /*
2033          * Check if the first element in the next sub element is a start
2034          * of a new profile
2035          */
2036         return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
2037                NULL : next_mbssid;
2038 }
2039
2040 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
2041                               const struct element *mbssid_elem,
2042                               const struct element *sub_elem,
2043                               u8 *merged_ie, size_t max_copy_len)
2044 {
2045         size_t copied_len = sub_elem->datalen;
2046         const struct element *next_mbssid;
2047
2048         if (sub_elem->datalen > max_copy_len)
2049                 return 0;
2050
2051         memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
2052
2053         while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
2054                                                                 mbssid_elem,
2055                                                                 sub_elem))) {
2056                 const struct element *next_sub = (void *)&next_mbssid->data[1];
2057
2058                 if (copied_len + next_sub->datalen > max_copy_len)
2059                         break;
2060                 memcpy(merged_ie + copied_len, next_sub->data,
2061                        next_sub->datalen);
2062                 copied_len += next_sub->datalen;
2063         }
2064
2065         return copied_len;
2066 }
2067 EXPORT_SYMBOL(cfg80211_merge_profile);
2068
2069 static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
2070                                        struct cfg80211_inform_bss *data,
2071                                        enum cfg80211_bss_frame_type ftype,
2072                                        const u8 *bssid, u64 tsf,
2073                                        u16 beacon_interval, const u8 *ie,
2074                                        size_t ielen,
2075                                        struct cfg80211_non_tx_bss *non_tx_data,
2076                                        gfp_t gfp)
2077 {
2078         const u8 *mbssid_index_ie;
2079         const struct element *elem, *sub;
2080         size_t new_ie_len;
2081         u8 new_bssid[ETH_ALEN];
2082         u8 *new_ie, *profile;
2083         u64 seen_indices = 0;
2084         u16 capability;
2085         struct cfg80211_bss *bss;
2086
2087         if (!non_tx_data)
2088                 return;
2089         if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
2090                 return;
2091         if (!wiphy->support_mbssid)
2092                 return;
2093         if (wiphy->support_only_he_mbssid &&
2094             !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
2095                 return;
2096
2097         new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2098         if (!new_ie)
2099                 return;
2100
2101         profile = kmalloc(ielen, gfp);
2102         if (!profile)
2103                 goto out;
2104
2105         for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
2106                 if (elem->datalen < 4)
2107                         continue;
2108                 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
2109                         u8 profile_len;
2110
2111                         if (sub->id != 0 || sub->datalen < 4) {
2112                                 /* not a valid BSS profile */
2113                                 continue;
2114                         }
2115
2116                         if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
2117                             sub->data[1] != 2) {
2118                                 /* The first element within the Nontransmitted
2119                                  * BSSID Profile is not the Nontransmitted
2120                                  * BSSID Capability element.
2121                                  */
2122                                 continue;
2123                         }
2124
2125                         memset(profile, 0, ielen);
2126                         profile_len = cfg80211_merge_profile(ie, ielen,
2127                                                              elem,
2128                                                              sub,
2129                                                              profile,
2130                                                              ielen);
2131
2132                         /* found a Nontransmitted BSSID Profile */
2133                         mbssid_index_ie = cfg80211_find_ie
2134                                 (WLAN_EID_MULTI_BSSID_IDX,
2135                                  profile, profile_len);
2136                         if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
2137                             mbssid_index_ie[2] == 0 ||
2138                             mbssid_index_ie[2] > 46) {
2139                                 /* No valid Multiple BSSID-Index element */
2140                                 continue;
2141                         }
2142
2143                         if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
2144                                 /* We don't support legacy split of a profile */
2145                                 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2146                                                     mbssid_index_ie[2]);
2147
2148                         seen_indices |= BIT_ULL(mbssid_index_ie[2]);
2149
2150                         non_tx_data->bssid_index = mbssid_index_ie[2];
2151                         non_tx_data->max_bssid_indicator = elem->data[0];
2152
2153                         cfg80211_gen_new_bssid(bssid,
2154                                                non_tx_data->max_bssid_indicator,
2155                                                non_tx_data->bssid_index,
2156                                                new_bssid);
2157                         memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2158                         new_ie_len = cfg80211_gen_new_ie(ie, ielen,
2159                                                          profile,
2160                                                          profile_len, new_ie,
2161                                                          gfp);
2162                         if (!new_ie_len)
2163                                 continue;
2164
2165                         capability = get_unaligned_le16(profile + 2);
2166                         bss = cfg80211_inform_single_bss_data(wiphy, data,
2167                                                               ftype,
2168                                                               new_bssid, tsf,
2169                                                               capability,
2170                                                               beacon_interval,
2171                                                               new_ie,
2172                                                               new_ie_len,
2173                                                               non_tx_data,
2174                                                               gfp);
2175                         if (!bss)
2176                                 break;
2177                         cfg80211_put_bss(wiphy, bss);
2178                 }
2179         }
2180
2181 out:
2182         kfree(new_ie);
2183         kfree(profile);
2184 }
2185
2186 struct cfg80211_bss *
2187 cfg80211_inform_bss_data(struct wiphy *wiphy,
2188                          struct cfg80211_inform_bss *data,
2189                          enum cfg80211_bss_frame_type ftype,
2190                          const u8 *bssid, u64 tsf, u16 capability,
2191                          u16 beacon_interval, const u8 *ie, size_t ielen,
2192                          gfp_t gfp)
2193 {
2194         struct cfg80211_bss *res;
2195         struct cfg80211_non_tx_bss non_tx_data;
2196
2197         res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
2198                                               capability, beacon_interval, ie,
2199                                               ielen, NULL, gfp);
2200         if (!res)
2201                 return NULL;
2202         non_tx_data.tx_bss = res;
2203         cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
2204                                    beacon_interval, ie, ielen, &non_tx_data,
2205                                    gfp);
2206         return res;
2207 }
2208 EXPORT_SYMBOL(cfg80211_inform_bss_data);
2209
2210 static void
2211 cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
2212                                  struct cfg80211_inform_bss *data,
2213                                  struct ieee80211_mgmt *mgmt, size_t len,
2214                                  struct cfg80211_non_tx_bss *non_tx_data,
2215                                  gfp_t gfp)
2216 {
2217         enum cfg80211_bss_frame_type ftype;
2218         const u8 *ie = mgmt->u.probe_resp.variable;
2219         size_t ielen = len - offsetof(struct ieee80211_mgmt,
2220                                       u.probe_resp.variable);
2221
2222         ftype = ieee80211_is_beacon(mgmt->frame_control) ?
2223                 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
2224
2225         cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
2226                                    le64_to_cpu(mgmt->u.probe_resp.timestamp),
2227                                    le16_to_cpu(mgmt->u.probe_resp.beacon_int),
2228                                    ie, ielen, non_tx_data, gfp);
2229 }
2230
2231 static void
2232 cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
2233                                    struct cfg80211_bss *nontrans_bss,
2234                                    struct ieee80211_mgmt *mgmt, size_t len)
2235 {
2236         u8 *ie, *new_ie, *pos;
2237         const u8 *nontrans_ssid, *trans_ssid, *mbssid;
2238         size_t ielen = len - offsetof(struct ieee80211_mgmt,
2239                                       u.probe_resp.variable);
2240         size_t new_ie_len;
2241         struct cfg80211_bss_ies *new_ies;
2242         const struct cfg80211_bss_ies *old;
2243         u8 cpy_len;
2244
2245         lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
2246
2247         ie = mgmt->u.probe_resp.variable;
2248
2249         new_ie_len = ielen;
2250         trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
2251         if (!trans_ssid)
2252                 return;
2253         new_ie_len -= trans_ssid[1];
2254         mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
2255         /*
2256          * It's not valid to have the MBSSID element before SSID
2257          * ignore if that happens - the code below assumes it is
2258          * after (while copying things inbetween).
2259          */
2260         if (!mbssid || mbssid < trans_ssid)
2261                 return;
2262         new_ie_len -= mbssid[1];
2263
2264         nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
2265         if (!nontrans_ssid)
2266                 return;
2267
2268         new_ie_len += nontrans_ssid[1];
2269
2270         /* generate new ie for nontrans BSS
2271          * 1. replace SSID with nontrans BSS' SSID
2272          * 2. skip MBSSID IE
2273          */
2274         new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
2275         if (!new_ie)
2276                 return;
2277
2278         new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
2279         if (!new_ies)
2280                 goto out_free;
2281
2282         pos = new_ie;
2283
2284         /* copy the nontransmitted SSID */
2285         cpy_len = nontrans_ssid[1] + 2;
2286         memcpy(pos, nontrans_ssid, cpy_len);
2287         pos += cpy_len;
2288         /* copy the IEs between SSID and MBSSID */
2289         cpy_len = trans_ssid[1] + 2;
2290         memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
2291         pos += (mbssid - (trans_ssid + cpy_len));
2292         /* copy the IEs after MBSSID */
2293         cpy_len = mbssid[1] + 2;
2294         memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
2295
2296         /* update ie */
2297         new_ies->len = new_ie_len;
2298         new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2299         new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
2300         memcpy(new_ies->data, new_ie, new_ie_len);
2301         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
2302                 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
2303                 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
2304                 rcu_assign_pointer(nontrans_bss->ies, new_ies);
2305                 if (old)
2306                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
2307         } else {
2308                 old = rcu_access_pointer(nontrans_bss->beacon_ies);
2309                 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
2310                 rcu_assign_pointer(nontrans_bss->ies, new_ies);
2311                 if (old)
2312                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
2313         }
2314
2315 out_free:
2316         kfree(new_ie);
2317 }
2318
2319 /* cfg80211_inform_bss_width_frame helper */
2320 static struct cfg80211_bss *
2321 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
2322                                       struct cfg80211_inform_bss *data,
2323                                       struct ieee80211_mgmt *mgmt, size_t len,
2324                                       gfp_t gfp)
2325 {
2326         struct cfg80211_internal_bss tmp = {}, *res;
2327         struct cfg80211_bss_ies *ies;
2328         struct ieee80211_channel *channel;
2329         bool signal_valid;
2330         struct ieee80211_ext *ext = NULL;
2331         u8 *bssid, *variable;
2332         u16 capability, beacon_int;
2333         size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
2334                                              u.probe_resp.variable);
2335         int bss_type;
2336
2337         BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
2338                         offsetof(struct ieee80211_mgmt, u.beacon.variable));
2339
2340         trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
2341
2342         if (WARN_ON(!mgmt))
2343                 return NULL;
2344
2345         if (WARN_ON(!wiphy))
2346                 return NULL;
2347
2348         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
2349                     (data->signal < 0 || data->signal > 100)))
2350                 return NULL;
2351
2352         if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
2353                 ext = (void *) mgmt;
2354                 min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
2355                 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2356                         min_hdr_len = offsetof(struct ieee80211_ext,
2357                                                u.s1g_short_beacon.variable);
2358         }
2359
2360         if (WARN_ON(len < min_hdr_len))
2361                 return NULL;
2362
2363         ielen = len - min_hdr_len;
2364         variable = mgmt->u.probe_resp.variable;
2365         if (ext) {
2366                 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2367                         variable = ext->u.s1g_short_beacon.variable;
2368                 else
2369                         variable = ext->u.s1g_beacon.variable;
2370         }
2371
2372         channel = cfg80211_get_bss_channel(wiphy, variable,
2373                                            ielen, data->chan, data->scan_width);
2374         if (!channel)
2375                 return NULL;
2376
2377         if (ext) {
2378                 const struct ieee80211_s1g_bcn_compat_ie *compat;
2379                 const struct element *elem;
2380
2381                 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
2382                                           variable, ielen);
2383                 if (!elem)
2384                         return NULL;
2385                 if (elem->datalen < sizeof(*compat))
2386                         return NULL;
2387                 compat = (void *)elem->data;
2388                 bssid = ext->u.s1g_beacon.sa;
2389                 capability = le16_to_cpu(compat->compat_info);
2390                 beacon_int = le16_to_cpu(compat->beacon_int);
2391         } else {
2392                 bssid = mgmt->bssid;
2393                 beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
2394                 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
2395         }
2396
2397         ies = kzalloc(sizeof(*ies) + ielen, gfp);
2398         if (!ies)
2399                 return NULL;
2400         ies->len = ielen;
2401         ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2402         ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
2403                            ieee80211_is_s1g_beacon(mgmt->frame_control);
2404         memcpy(ies->data, variable, ielen);
2405
2406         if (ieee80211_is_probe_resp(mgmt->frame_control))
2407                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
2408         else
2409                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
2410         rcu_assign_pointer(tmp.pub.ies, ies);
2411
2412         memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
2413         tmp.pub.beacon_interval = beacon_int;
2414         tmp.pub.capability = capability;
2415         tmp.pub.channel = channel;
2416         tmp.pub.scan_width = data->scan_width;
2417         tmp.pub.signal = data->signal;
2418         tmp.ts_boottime = data->boottime_ns;
2419         tmp.parent_tsf = data->parent_tsf;
2420         tmp.pub.chains = data->chains;
2421         memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
2422         ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
2423
2424         signal_valid = data->chan == channel;
2425         res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
2426                                   jiffies);
2427         if (!res)
2428                 return NULL;
2429
2430         if (channel->band == NL80211_BAND_60GHZ) {
2431                 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
2432                 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2433                     bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2434                         regulatory_hint_found_beacon(wiphy, channel, gfp);
2435         } else {
2436                 if (res->pub.capability & WLAN_CAPABILITY_ESS)
2437                         regulatory_hint_found_beacon(wiphy, channel, gfp);
2438         }
2439
2440         trace_cfg80211_return_bss(&res->pub);
2441         /* cfg80211_bss_update gives us a referenced result */
2442         return &res->pub;
2443 }
2444
2445 struct cfg80211_bss *
2446 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
2447                                struct cfg80211_inform_bss *data,
2448                                struct ieee80211_mgmt *mgmt, size_t len,
2449                                gfp_t gfp)
2450 {
2451         struct cfg80211_bss *res, *tmp_bss;
2452         const u8 *ie = mgmt->u.probe_resp.variable;
2453         const struct cfg80211_bss_ies *ies1, *ies2;
2454         size_t ielen = len - offsetof(struct ieee80211_mgmt,
2455                                       u.probe_resp.variable);
2456         struct cfg80211_non_tx_bss non_tx_data;
2457
2458         res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
2459                                                     len, gfp);
2460         if (!res || !wiphy->support_mbssid ||
2461             !cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
2462                 return res;
2463         if (wiphy->support_only_he_mbssid &&
2464             !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
2465                 return res;
2466
2467         non_tx_data.tx_bss = res;
2468         /* process each non-transmitting bss */
2469         cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
2470                                          &non_tx_data, gfp);
2471
2472         spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
2473
2474         /* check if the res has other nontransmitting bss which is not
2475          * in MBSSID IE
2476          */
2477         ies1 = rcu_access_pointer(res->ies);
2478
2479         /* go through nontrans_list, if the timestamp of the BSS is
2480          * earlier than the timestamp of the transmitting BSS then
2481          * update it
2482          */
2483         list_for_each_entry(tmp_bss, &res->nontrans_list,
2484                             nontrans_list) {
2485                 ies2 = rcu_access_pointer(tmp_bss->ies);
2486                 if (ies2->tsf < ies1->tsf)
2487                         cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
2488                                                            mgmt, len);
2489         }
2490         spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
2491
2492         return res;
2493 }
2494 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
2495
2496 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2497 {
2498         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2499         struct cfg80211_internal_bss *bss;
2500
2501         if (!pub)
2502                 return;
2503
2504         bss = container_of(pub, struct cfg80211_internal_bss, pub);
2505
2506         spin_lock_bh(&rdev->bss_lock);
2507         bss_ref_get(rdev, bss);
2508         spin_unlock_bh(&rdev->bss_lock);
2509 }
2510 EXPORT_SYMBOL(cfg80211_ref_bss);
2511
2512 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2513 {
2514         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2515         struct cfg80211_internal_bss *bss;
2516
2517         if (!pub)
2518                 return;
2519
2520         bss = container_of(pub, struct cfg80211_internal_bss, pub);
2521
2522         spin_lock_bh(&rdev->bss_lock);
2523         bss_ref_put(rdev, bss);
2524         spin_unlock_bh(&rdev->bss_lock);
2525 }
2526 EXPORT_SYMBOL(cfg80211_put_bss);
2527
2528 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2529 {
2530         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2531         struct cfg80211_internal_bss *bss, *tmp1;
2532         struct cfg80211_bss *nontrans_bss, *tmp;
2533
2534         if (WARN_ON(!pub))
2535                 return;
2536
2537         bss = container_of(pub, struct cfg80211_internal_bss, pub);
2538
2539         spin_lock_bh(&rdev->bss_lock);
2540         if (list_empty(&bss->list))
2541                 goto out;
2542
2543         list_for_each_entry_safe(nontrans_bss, tmp,
2544                                  &pub->nontrans_list,
2545                                  nontrans_list) {
2546                 tmp1 = container_of(nontrans_bss,
2547                                     struct cfg80211_internal_bss, pub);
2548                 if (__cfg80211_unlink_bss(rdev, tmp1))
2549                         rdev->bss_generation++;
2550         }
2551
2552         if (__cfg80211_unlink_bss(rdev, bss))
2553                 rdev->bss_generation++;
2554 out:
2555         spin_unlock_bh(&rdev->bss_lock);
2556 }
2557 EXPORT_SYMBOL(cfg80211_unlink_bss);
2558
2559 void cfg80211_bss_iter(struct wiphy *wiphy,
2560                        struct cfg80211_chan_def *chandef,
2561                        void (*iter)(struct wiphy *wiphy,
2562                                     struct cfg80211_bss *bss,
2563                                     void *data),
2564                        void *iter_data)
2565 {
2566         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2567         struct cfg80211_internal_bss *bss;
2568
2569         spin_lock_bh(&rdev->bss_lock);
2570
2571         list_for_each_entry(bss, &rdev->bss_list, list) {
2572                 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
2573                         iter(wiphy, &bss->pub, iter_data);
2574         }
2575
2576         spin_unlock_bh(&rdev->bss_lock);
2577 }
2578 EXPORT_SYMBOL(cfg80211_bss_iter);
2579
2580 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
2581                                      struct ieee80211_channel *chan)
2582 {
2583         struct wiphy *wiphy = wdev->wiphy;
2584         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2585         struct cfg80211_internal_bss *cbss = wdev->current_bss;
2586         struct cfg80211_internal_bss *new = NULL;
2587         struct cfg80211_internal_bss *bss;
2588         struct cfg80211_bss *nontrans_bss;
2589         struct cfg80211_bss *tmp;
2590
2591         spin_lock_bh(&rdev->bss_lock);
2592
2593         /*
2594          * Some APs use CSA also for bandwidth changes, i.e., without actually
2595          * changing the control channel, so no need to update in such a case.
2596          */
2597         if (cbss->pub.channel == chan)
2598                 goto done;
2599
2600         /* use transmitting bss */
2601         if (cbss->pub.transmitted_bss)
2602                 cbss = container_of(cbss->pub.transmitted_bss,
2603                                     struct cfg80211_internal_bss,
2604                                     pub);
2605
2606         cbss->pub.channel = chan;
2607
2608         list_for_each_entry(bss, &rdev->bss_list, list) {
2609                 if (!cfg80211_bss_type_match(bss->pub.capability,
2610                                              bss->pub.channel->band,
2611                                              wdev->conn_bss_type))
2612                         continue;
2613
2614                 if (bss == cbss)
2615                         continue;
2616
2617                 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2618                         new = bss;
2619                         break;
2620                 }
2621         }
2622
2623         if (new) {
2624                 /* to save time, update IEs for transmitting bss only */
2625                 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2626                         new->pub.proberesp_ies = NULL;
2627                         new->pub.beacon_ies = NULL;
2628                 }
2629
2630                 list_for_each_entry_safe(nontrans_bss, tmp,
2631                                          &new->pub.nontrans_list,
2632                                          nontrans_list) {
2633                         bss = container_of(nontrans_bss,
2634                                            struct cfg80211_internal_bss, pub);
2635                         if (__cfg80211_unlink_bss(rdev, bss))
2636                                 rdev->bss_generation++;
2637                 }
2638
2639                 WARN_ON(atomic_read(&new->hold));
2640                 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2641                         rdev->bss_generation++;
2642         }
2643
2644         rb_erase(&cbss->rbn, &rdev->bss_tree);
2645         rb_insert_bss(rdev, cbss);
2646         rdev->bss_generation++;
2647
2648         list_for_each_entry_safe(nontrans_bss, tmp,
2649                                  &cbss->pub.nontrans_list,
2650                                  nontrans_list) {
2651                 bss = container_of(nontrans_bss,
2652                                    struct cfg80211_internal_bss, pub);
2653                 bss->pub.channel = chan;
2654                 rb_erase(&bss->rbn, &rdev->bss_tree);
2655                 rb_insert_bss(rdev, bss);
2656                 rdev->bss_generation++;
2657         }
2658
2659 done:
2660         spin_unlock_bh(&rdev->bss_lock);
2661 }
2662
2663 #ifdef CONFIG_CFG80211_WEXT
2664 static struct cfg80211_registered_device *
2665 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2666 {
2667         struct cfg80211_registered_device *rdev;
2668         struct net_device *dev;
2669
2670         ASSERT_RTNL();
2671
2672         dev = dev_get_by_index(net, ifindex);
2673         if (!dev)
2674                 return ERR_PTR(-ENODEV);
2675         if (dev->ieee80211_ptr)
2676                 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2677         else
2678                 rdev = ERR_PTR(-ENODEV);
2679         dev_put(dev);
2680         return rdev;
2681 }
2682
2683 int cfg80211_wext_siwscan(struct net_device *dev,
2684                           struct iw_request_info *info,
2685                           union iwreq_data *wrqu, char *extra)
2686 {
2687         struct cfg80211_registered_device *rdev;
2688         struct wiphy *wiphy;
2689         struct iw_scan_req *wreq = NULL;
2690         struct cfg80211_scan_request *creq = NULL;
2691         int i, err, n_channels = 0;
2692         enum nl80211_band band;
2693
2694         if (!netif_running(dev))
2695                 return -ENETDOWN;
2696
2697         if (wrqu->data.length == sizeof(struct iw_scan_req))
2698                 wreq = (struct iw_scan_req *)extra;
2699
2700         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2701
2702         if (IS_ERR(rdev))
2703                 return PTR_ERR(rdev);
2704
2705         if (rdev->scan_req || rdev->scan_msg) {
2706                 err = -EBUSY;
2707                 goto out;
2708         }
2709
2710         wiphy = &rdev->wiphy;
2711
2712         /* Determine number of channels, needed to allocate creq */
2713         if (wreq && wreq->num_channels)
2714                 n_channels = wreq->num_channels;
2715         else
2716                 n_channels = ieee80211_get_num_supported_channels(wiphy);
2717
2718         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2719                        n_channels * sizeof(void *),
2720                        GFP_ATOMIC);
2721         if (!creq) {
2722                 err = -ENOMEM;
2723                 goto out;
2724         }
2725
2726         creq->wiphy = wiphy;
2727         creq->wdev = dev->ieee80211_ptr;
2728         /* SSIDs come after channels */
2729         creq->ssids = (void *)&creq->channels[n_channels];
2730         creq->n_channels = n_channels;
2731         creq->n_ssids = 1;
2732         creq->scan_start = jiffies;
2733
2734         /* translate "Scan on frequencies" request */
2735         i = 0;
2736         for (band = 0; band < NUM_NL80211_BANDS; band++) {
2737                 int j;
2738
2739                 if (!wiphy->bands[band])
2740                         continue;
2741
2742                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2743                         /* ignore disabled channels */
2744                         if (wiphy->bands[band]->channels[j].flags &
2745                                                 IEEE80211_CHAN_DISABLED)
2746                                 continue;
2747
2748                         /* If we have a wireless request structure and the
2749                          * wireless request specifies frequencies, then search
2750                          * for the matching hardware channel.
2751                          */
2752                         if (wreq && wreq->num_channels) {
2753                                 int k;
2754                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2755                                 for (k = 0; k < wreq->num_channels; k++) {
2756                                         struct iw_freq *freq =
2757                                                 &wreq->channel_list[k];
2758                                         int wext_freq =
2759                                                 cfg80211_wext_freq(freq);
2760
2761                                         if (wext_freq == wiphy_freq)
2762                                                 goto wext_freq_found;
2763                                 }
2764                                 goto wext_freq_not_found;
2765                         }
2766
2767                 wext_freq_found:
2768                         creq->channels[i] = &wiphy->bands[band]->channels[j];
2769                         i++;
2770                 wext_freq_not_found: ;
2771                 }
2772         }
2773         /* No channels found? */
2774         if (!i) {
2775                 err = -EINVAL;
2776                 goto out;
2777         }
2778
2779         /* Set real number of channels specified in creq->channels[] */
2780         creq->n_channels = i;
2781
2782         /* translate "Scan for SSID" request */
2783         if (wreq) {
2784                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2785                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2786                                 err = -EINVAL;
2787                                 goto out;
2788                         }
2789                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2790                         creq->ssids[0].ssid_len = wreq->essid_len;
2791                 }
2792                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2793                         creq->n_ssids = 0;
2794         }
2795
2796         for (i = 0; i < NUM_NL80211_BANDS; i++)
2797                 if (wiphy->bands[i])
2798                         creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2799
2800         eth_broadcast_addr(creq->bssid);
2801
2802         wiphy_lock(&rdev->wiphy);
2803
2804         rdev->scan_req = creq;
2805         err = rdev_scan(rdev, creq);
2806         if (err) {
2807                 rdev->scan_req = NULL;
2808                 /* creq will be freed below */
2809         } else {
2810                 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2811                 /* creq now owned by driver */
2812                 creq = NULL;
2813                 dev_hold(dev);
2814         }
2815         wiphy_unlock(&rdev->wiphy);
2816  out:
2817         kfree(creq);
2818         return err;
2819 }
2820 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2821
2822 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2823                                     const struct cfg80211_bss_ies *ies,
2824                                     char *current_ev, char *end_buf)
2825 {
2826         const u8 *pos, *end, *next;
2827         struct iw_event iwe;
2828
2829         if (!ies)
2830                 return current_ev;
2831
2832         /*
2833          * If needed, fragment the IEs buffer (at IE boundaries) into short
2834          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2835          */
2836         pos = ies->data;
2837         end = pos + ies->len;
2838
2839         while (end - pos > IW_GENERIC_IE_MAX) {
2840                 next = pos + 2 + pos[1];
2841                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2842                         next = next + 2 + next[1];
2843
2844                 memset(&iwe, 0, sizeof(iwe));
2845                 iwe.cmd = IWEVGENIE;
2846                 iwe.u.data.length = next - pos;
2847                 current_ev = iwe_stream_add_point_check(info, current_ev,
2848                                                         end_buf, &iwe,
2849                                                         (void *)pos);
2850                 if (IS_ERR(current_ev))
2851                         return current_ev;
2852                 pos = next;
2853         }
2854
2855         if (end > pos) {
2856                 memset(&iwe, 0, sizeof(iwe));
2857                 iwe.cmd = IWEVGENIE;
2858                 iwe.u.data.length = end - pos;
2859                 current_ev = iwe_stream_add_point_check(info, current_ev,
2860                                                         end_buf, &iwe,
2861                                                         (void *)pos);
2862                 if (IS_ERR(current_ev))
2863                         return current_ev;
2864         }
2865
2866         return current_ev;
2867 }
2868
2869 static char *
2870 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2871               struct cfg80211_internal_bss *bss, char *current_ev,
2872               char *end_buf)
2873 {
2874         const struct cfg80211_bss_ies *ies;
2875         struct iw_event iwe;
2876         const u8 *ie;
2877         u8 buf[50];
2878         u8 *cfg, *p, *tmp;
2879         int rem, i, sig;
2880         bool ismesh = false;
2881
2882         memset(&iwe, 0, sizeof(iwe));
2883         iwe.cmd = SIOCGIWAP;
2884         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2885         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2886         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2887                                                 IW_EV_ADDR_LEN);
2888         if (IS_ERR(current_ev))
2889                 return current_ev;
2890
2891         memset(&iwe, 0, sizeof(iwe));
2892         iwe.cmd = SIOCGIWFREQ;
2893         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2894         iwe.u.freq.e = 0;
2895         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2896                                                 IW_EV_FREQ_LEN);
2897         if (IS_ERR(current_ev))
2898                 return current_ev;
2899
2900         memset(&iwe, 0, sizeof(iwe));
2901         iwe.cmd = SIOCGIWFREQ;
2902         iwe.u.freq.m = bss->pub.channel->center_freq;
2903         iwe.u.freq.e = 6;
2904         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2905                                                 IW_EV_FREQ_LEN);
2906         if (IS_ERR(current_ev))
2907                 return current_ev;
2908
2909         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2910                 memset(&iwe, 0, sizeof(iwe));
2911                 iwe.cmd = IWEVQUAL;
2912                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2913                                      IW_QUAL_NOISE_INVALID |
2914                                      IW_QUAL_QUAL_UPDATED;
2915                 switch (wiphy->signal_type) {
2916                 case CFG80211_SIGNAL_TYPE_MBM:
2917                         sig = bss->pub.signal / 100;
2918                         iwe.u.qual.level = sig;
2919                         iwe.u.qual.updated |= IW_QUAL_DBM;
2920                         if (sig < -110)         /* rather bad */
2921                                 sig = -110;
2922                         else if (sig > -40)     /* perfect */
2923                                 sig = -40;
2924                         /* will give a range of 0 .. 70 */
2925                         iwe.u.qual.qual = sig + 110;
2926                         break;
2927                 case CFG80211_SIGNAL_TYPE_UNSPEC:
2928                         iwe.u.qual.level = bss->pub.signal;
2929                         /* will give range 0 .. 100 */
2930                         iwe.u.qual.qual = bss->pub.signal;
2931                         break;
2932                 default:
2933                         /* not reached */
2934                         break;
2935                 }
2936                 current_ev = iwe_stream_add_event_check(info, current_ev,
2937                                                         end_buf, &iwe,
2938                                                         IW_EV_QUAL_LEN);
2939                 if (IS_ERR(current_ev))
2940                         return current_ev;
2941         }
2942
2943         memset(&iwe, 0, sizeof(iwe));
2944         iwe.cmd = SIOCGIWENCODE;
2945         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2946                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2947         else
2948                 iwe.u.data.flags = IW_ENCODE_DISABLED;
2949         iwe.u.data.length = 0;
2950         current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2951                                                 &iwe, "");
2952         if (IS_ERR(current_ev))
2953                 return current_ev;
2954
2955         rcu_read_lock();
2956         ies = rcu_dereference(bss->pub.ies);
2957         rem = ies->len;
2958         ie = ies->data;
2959
2960         while (rem >= 2) {
2961                 /* invalid data */
2962                 if (ie[1] > rem - 2)
2963                         break;
2964
2965                 switch (ie[0]) {
2966                 case WLAN_EID_SSID:
2967                         memset(&iwe, 0, sizeof(iwe));
2968                         iwe.cmd = SIOCGIWESSID;
2969                         iwe.u.data.length = ie[1];
2970                         iwe.u.data.flags = 1;
2971                         current_ev = iwe_stream_add_point_check(info,
2972                                                                 current_ev,
2973                                                                 end_buf, &iwe,
2974                                                                 (u8 *)ie + 2);
2975                         if (IS_ERR(current_ev))
2976                                 goto unlock;
2977                         break;
2978                 case WLAN_EID_MESH_ID:
2979                         memset(&iwe, 0, sizeof(iwe));
2980                         iwe.cmd = SIOCGIWESSID;
2981                         iwe.u.data.length = ie[1];
2982                         iwe.u.data.flags = 1;
2983                         current_ev = iwe_stream_add_point_check(info,
2984                                                                 current_ev,
2985                                                                 end_buf, &iwe,
2986                                                                 (u8 *)ie + 2);
2987                         if (IS_ERR(current_ev))
2988                                 goto unlock;
2989                         break;
2990                 case WLAN_EID_MESH_CONFIG:
2991                         ismesh = true;
2992                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2993                                 break;
2994                         cfg = (u8 *)ie + 2;
2995                         memset(&iwe, 0, sizeof(iwe));
2996                         iwe.cmd = IWEVCUSTOM;
2997                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2998                                 "0x%02X", cfg[0]);
2999                         iwe.u.data.length = strlen(buf);
3000                         current_ev = iwe_stream_add_point_check(info,
3001                                                                 current_ev,
3002                                                                 end_buf,
3003                                                                 &iwe, buf);
3004                         if (IS_ERR(current_ev))
3005                                 goto unlock;
3006                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
3007                                 cfg[1]);
3008                         iwe.u.data.length = strlen(buf);
3009                         current_ev = iwe_stream_add_point_check(info,
3010                                                                 current_ev,
3011                                                                 end_buf,
3012                                                                 &iwe, buf);
3013                         if (IS_ERR(current_ev))
3014                                 goto unlock;
3015                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
3016                                 cfg[2]);
3017                         iwe.u.data.length = strlen(buf);
3018                         current_ev = iwe_stream_add_point_check(info,
3019                                                                 current_ev,
3020                                                                 end_buf,
3021                                                                 &iwe, buf);
3022                         if (IS_ERR(current_ev))
3023                                 goto unlock;
3024                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
3025                         iwe.u.data.length = strlen(buf);
3026                         current_ev = iwe_stream_add_point_check(info,
3027                                                                 current_ev,
3028                                                                 end_buf,
3029                                                                 &iwe, buf);
3030                         if (IS_ERR(current_ev))
3031                                 goto unlock;
3032                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
3033                         iwe.u.data.length = strlen(buf);
3034                         current_ev = iwe_stream_add_point_check(info,
3035                                                                 current_ev,
3036                                                                 end_buf,
3037                                                                 &iwe, buf);
3038                         if (IS_ERR(current_ev))
3039                                 goto unlock;
3040                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
3041                         iwe.u.data.length = strlen(buf);
3042                         current_ev = iwe_stream_add_point_check(info,
3043                                                                 current_ev,
3044                                                                 end_buf,
3045                                                                 &iwe, buf);
3046                         if (IS_ERR(current_ev))
3047                                 goto unlock;
3048                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
3049                         iwe.u.data.length = strlen(buf);
3050                         current_ev = iwe_stream_add_point_check(info,
3051                                                                 current_ev,
3052                                                                 end_buf,
3053                                                                 &iwe, buf);
3054                         if (IS_ERR(current_ev))
3055                                 goto unlock;
3056                         break;
3057                 case WLAN_EID_SUPP_RATES:
3058                 case WLAN_EID_EXT_SUPP_RATES:
3059                         /* display all supported rates in readable format */
3060                         p = current_ev + iwe_stream_lcp_len(info);
3061
3062                         memset(&iwe, 0, sizeof(iwe));
3063                         iwe.cmd = SIOCGIWRATE;
3064                         /* Those two flags are ignored... */
3065                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3066
3067                         for (i = 0; i < ie[1]; i++) {
3068                                 iwe.u.bitrate.value =
3069                                         ((ie[i + 2] & 0x7f) * 500000);
3070                                 tmp = p;
3071                                 p = iwe_stream_add_value(info, current_ev, p,
3072                                                          end_buf, &iwe,
3073                                                          IW_EV_PARAM_LEN);
3074                                 if (p == tmp) {
3075                                         current_ev = ERR_PTR(-E2BIG);
3076                                         goto unlock;
3077                                 }
3078                         }
3079                         current_ev = p;
3080                         break;
3081                 }
3082                 rem -= ie[1] + 2;
3083                 ie += ie[1] + 2;
3084         }
3085
3086         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
3087             ismesh) {
3088                 memset(&iwe, 0, sizeof(iwe));
3089                 iwe.cmd = SIOCGIWMODE;
3090                 if (ismesh)
3091                         iwe.u.mode = IW_MODE_MESH;
3092                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
3093                         iwe.u.mode = IW_MODE_MASTER;
3094                 else
3095                         iwe.u.mode = IW_MODE_ADHOC;
3096                 current_ev = iwe_stream_add_event_check(info, current_ev,
3097                                                         end_buf, &iwe,
3098                                                         IW_EV_UINT_LEN);
3099                 if (IS_ERR(current_ev))
3100                         goto unlock;
3101         }
3102
3103         memset(&iwe, 0, sizeof(iwe));
3104         iwe.cmd = IWEVCUSTOM;
3105         sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
3106         iwe.u.data.length = strlen(buf);
3107         current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3108                                                 &iwe, buf);
3109         if (IS_ERR(current_ev))
3110                 goto unlock;
3111         memset(&iwe, 0, sizeof(iwe));
3112         iwe.cmd = IWEVCUSTOM;
3113         sprintf(buf, " Last beacon: %ums ago",
3114                 elapsed_jiffies_msecs(bss->ts));
3115         iwe.u.data.length = strlen(buf);
3116         current_ev = iwe_stream_add_point_check(info, current_ev,
3117                                                 end_buf, &iwe, buf);
3118         if (IS_ERR(current_ev))
3119                 goto unlock;
3120
3121         current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
3122
3123  unlock:
3124         rcu_read_unlock();
3125         return current_ev;
3126 }
3127
3128
3129 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
3130                                   struct iw_request_info *info,
3131                                   char *buf, size_t len)
3132 {
3133         char *current_ev = buf;
3134         char *end_buf = buf + len;
3135         struct cfg80211_internal_bss *bss;
3136         int err = 0;
3137
3138         spin_lock_bh(&rdev->bss_lock);
3139         cfg80211_bss_expire(rdev);
3140
3141         list_for_each_entry(bss, &rdev->bss_list, list) {
3142                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3143                         err = -E2BIG;
3144                         break;
3145                 }
3146                 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
3147                                            current_ev, end_buf);
3148                 if (IS_ERR(current_ev)) {
3149                         err = PTR_ERR(current_ev);
3150                         break;
3151                 }
3152         }
3153         spin_unlock_bh(&rdev->bss_lock);
3154
3155         if (err)
3156                 return err;
3157         return current_ev - buf;
3158 }
3159
3160
3161 int cfg80211_wext_giwscan(struct net_device *dev,
3162                           struct iw_request_info *info,
3163                           struct iw_point *data, char *extra)
3164 {
3165         struct cfg80211_registered_device *rdev;
3166         int res;
3167
3168         if (!netif_running(dev))
3169                 return -ENETDOWN;
3170
3171         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3172
3173         if (IS_ERR(rdev))
3174                 return PTR_ERR(rdev);
3175
3176         if (rdev->scan_req || rdev->scan_msg)
3177                 return -EAGAIN;
3178
3179         res = ieee80211_scan_results(rdev, info, extra, data->length);
3180         data->length = 0;
3181         if (res >= 0) {
3182                 data->length = res;
3183                 res = 0;
3184         }
3185
3186         return res;
3187 }
3188 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
3189 #endif