net/wireless/scan.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * cfg80211 scan result handling
   4  *
   5  * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  * Copyright 2016       Intel Deutschland GmbH
   8  * Copyright (C) 2018-2023 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  * @psd_20: The 20MHz PSD EIRP of the primary 20MHz channel for the reported AP
 100  */
 101 struct cfg80211_colocated_ap {
 102         struct list_head list;
 103         u8 bssid[ETH_ALEN];
 104         u8 ssid[IEEE80211_MAX_SSID_LEN];
 105         size_t ssid_len;
 106         u32 short_ssid;
 107         u32 center_freq;
 108         u8 unsolicited_probe:1,
 109            oct_recommended:1,
 110            same_ssid:1,
 111            multi_bss:1,
 112            transmitted_bssid:1,
 113            colocated_ess:1,
 114            short_ssid_valid:1;
 115         s8 psd_20;
 116 };
 117
 118 static void bss_free(struct cfg80211_internal_bss *bss)
 119 {
 120         struct cfg80211_bss_ies *ies;
 121
 122         if (WARN_ON(atomic_read(&bss->hold)))
 123                 return;
 124
 125         ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
 126         if (ies && !bss->pub.hidden_beacon_bss)
 127                 kfree_rcu(ies, rcu_head);
 128         ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
 129         if (ies)
 130                 kfree_rcu(ies, rcu_head);
 131
 132         /*
 133          * This happens when the module is removed, it doesn't
 134          * really matter any more save for completeness
 135          */
 136         if (!list_empty(&bss->hidden_list))
 137                 list_del(&bss->hidden_list);
 138
 139         kfree(bss);
 140 }
 141
 142 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
 143                                struct cfg80211_internal_bss *bss)
 144 {
 145         lockdep_assert_held(&rdev->bss_lock);
 146
 147         bss->refcount++;
 148
 149         if (bss->pub.hidden_beacon_bss)
 150                 bss_from_pub(bss->pub.hidden_beacon_bss)->refcount++;
 151
 152         if (bss->pub.transmitted_bss)
 153                 bss_from_pub(bss->pub.transmitted_bss)->refcount++;
 154 }
 155
 156 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
 157                                struct cfg80211_internal_bss *bss)
 158 {
 159         lockdep_assert_held(&rdev->bss_lock);
 160
 161         if (bss->pub.hidden_beacon_bss) {
 162                 struct cfg80211_internal_bss *hbss;
 163
 164                 hbss = bss_from_pub(bss->pub.hidden_beacon_bss);
 165                 hbss->refcount--;
 166                 if (hbss->refcount == 0)
 167                         bss_free(hbss);
 168         }
 169
 170         if (bss->pub.transmitted_bss) {
 171                 struct cfg80211_internal_bss *tbss;
 172
 173                 tbss = bss_from_pub(bss->pub.transmitted_bss);
 174                 tbss->refcount--;
 175                 if (tbss->refcount == 0)
 176                         bss_free(tbss);
 177         }
 178
 179         bss->refcount--;
 180         if (bss->refcount == 0)
 181                 bss_free(bss);
 182 }
 183
 184 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
 185                                   struct cfg80211_internal_bss *bss)
 186 {
 187         lockdep_assert_held(&rdev->bss_lock);
 188
 189         if (!list_empty(&bss->hidden_list)) {
 190                 /*
 191                  * don't remove the beacon entry if it has
 192                  * probe responses associated with it
 193                  */
 194                 if (!bss->pub.hidden_beacon_bss)
 195                         return false;
 196                 /*
 197                  * if it's a probe response entry break its
 198                  * link to the other entries in the group
 199                  */
 200                 list_del_init(&bss->hidden_list);
 201         }
 202
 203         list_del_init(&bss->list);
 204         list_del_init(&bss->pub.nontrans_list);
 205         rb_erase(&bss->rbn, &rdev->bss_tree);
 206         rdev->bss_entries--;
 207         WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
 208                   "rdev bss entries[%d]/list[empty:%d] corruption\n",
 209                   rdev->bss_entries, list_empty(&rdev->bss_list));
 210         bss_ref_put(rdev, bss);
 211         return true;
 212 }
 213
 214 bool cfg80211_is_element_inherited(const struct element *elem,
 215                                    const struct element *non_inherit_elem)
 216 {
 217         u8 id_len, ext_id_len, i, loop_len, id;
 218         const u8 *list;
 219
 220         if (elem->id == WLAN_EID_MULTIPLE_BSSID)
 221                 return false;
 222
 223         if (elem->id == WLAN_EID_EXTENSION && elem->datalen > 1 &&
 224             elem->data[0] == WLAN_EID_EXT_EHT_MULTI_LINK)
 225                 return false;
 226
 227         if (!non_inherit_elem || non_inherit_elem->datalen < 2)
 228                 return true;
 229
 230         /*
 231          * non inheritance element format is:
 232          * ext ID (56) | IDs list len | list | extension IDs list len | list
 233          * Both lists are optional. Both lengths are mandatory.
 234          * This means valid length is:
 235          * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
 236          */
 237         id_len = non_inherit_elem->data[1];
 238         if (non_inherit_elem->datalen < 3 + id_len)
 239                 return true;
 240
 241         ext_id_len = non_inherit_elem->data[2 + id_len];
 242         if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
 243                 return true;
 244
 245         if (elem->id == WLAN_EID_EXTENSION) {
 246                 if (!ext_id_len)
 247                         return true;
 248                 loop_len = ext_id_len;
 249                 list = &non_inherit_elem->data[3 + id_len];
 250                 id = elem->data[0];
 251         } else {
 252                 if (!id_len)
 253                         return true;
 254                 loop_len = id_len;
 255                 list = &non_inherit_elem->data[2];
 256                 id = elem->id;
 257         }
 258
 259         for (i = 0; i < loop_len; i++) {
 260                 if (list[i] == id)
 261                         return false;
 262         }
 263
 264         return true;
 265 }
 266 EXPORT_SYMBOL(cfg80211_is_element_inherited);
 267
 268 static size_t cfg80211_copy_elem_with_frags(const struct element *elem,
 269                                             const u8 *ie, size_t ie_len,
 270                                             u8 **pos, u8 *buf, size_t buf_len)
 271 {
 272         if (WARN_ON((u8 *)elem < ie || elem->data > ie + ie_len ||
 273                     elem->data + elem->datalen > ie + ie_len))
 274                 return 0;
 275
 276         if (elem->datalen + 2 > buf + buf_len - *pos)
 277                 return 0;
 278
 279         memcpy(*pos, elem, elem->datalen + 2);
 280         *pos += elem->datalen + 2;
 281
 282         /* Finish if it is not fragmented  */
 283         if (elem->datalen != 255)
 284                 return *pos - buf;
 285
 286         ie_len = ie + ie_len - elem->data - elem->datalen;
 287         ie = (const u8 *)elem->data + elem->datalen;
 288
 289         for_each_element(elem, ie, ie_len) {
 290                 if (elem->id != WLAN_EID_FRAGMENT)
 291                         break;
 292
 293                 if (elem->datalen + 2 > buf + buf_len - *pos)
 294                         return 0;
 295
 296                 memcpy(*pos, elem, elem->datalen + 2);
 297                 *pos += elem->datalen + 2;
 298
 299                 if (elem->datalen != 255)
 300                         break;
 301         }
 302
 303         return *pos - buf;
 304 }
 305
 306 static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
 307                                   const u8 *subie, size_t subie_len,
 308                                   u8 *new_ie, size_t new_ie_len)
 309 {
 310         const struct element *non_inherit_elem, *parent, *sub;
 311         u8 *pos = new_ie;
 312         u8 id, ext_id;
 313         unsigned int match_len;
 314
 315         non_inherit_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
 316                                                   subie, subie_len);
 317
 318         /* We copy the elements one by one from the parent to the generated
 319          * elements.
 320          * If they are not inherited (included in subie or in the non
 321          * inheritance element), then we copy all occurrences the first time
 322          * we see this element type.
 323          */
 324         for_each_element(parent, ie, ielen) {
 325                 if (parent->id == WLAN_EID_FRAGMENT)
 326                         continue;
 327
 328                 if (parent->id == WLAN_EID_EXTENSION) {
 329                         if (parent->datalen < 1)
 330                                 continue;
 331
 332                         id = WLAN_EID_EXTENSION;
 333                         ext_id = parent->data[0];
 334                         match_len = 1;
 335                 } else {
 336                         id = parent->id;
 337                         match_len = 0;
 338                 }
 339
 340                 /* Find first occurrence in subie */
 341                 sub = cfg80211_find_elem_match(id, subie, subie_len,
 342                                                &ext_id, match_len, 0);
 343
 344                 /* Copy from parent if not in subie and inherited */
 345                 if (!sub &&
 346                     cfg80211_is_element_inherited(parent, non_inherit_elem)) {
 347                         if (!cfg80211_copy_elem_with_frags(parent,
 348                                                            ie, ielen,
 349                                                            &pos, new_ie,
 350                                                            new_ie_len))
 351                                 return 0;
 352
 353                         continue;
 354                 }
 355
 356                 /* Already copied if an earlier element had the same type */
 357                 if (cfg80211_find_elem_match(id, ie, (u8 *)parent - ie,
 358                                              &ext_id, match_len, 0))
 359                         continue;
 360
 361                 /* Not inheriting, copy all similar elements from subie */
 362                 while (sub) {
 363                         if (!cfg80211_copy_elem_with_frags(sub,
 364                                                            subie, subie_len,
 365                                                            &pos, new_ie,
 366                                                            new_ie_len))
 367                                 return 0;
 368
 369                         sub = cfg80211_find_elem_match(id,
 370                                                        sub->data + sub->datalen,
 371                                                        subie_len + subie -
 372                                                        (sub->data +
 373                                                         sub->datalen),
 374                                                        &ext_id, match_len, 0);
 375                 }
 376         }
 377
 378         /* The above misses elements that are included in subie but not in the
 379          * parent, so do a pass over subie and append those.
 380          * Skip the non-tx BSSID caps and non-inheritance element.
 381          */
 382         for_each_element(sub, subie, subie_len) {
 383                 if (sub->id == WLAN_EID_NON_TX_BSSID_CAP)
 384                         continue;
 385
 386                 if (sub->id == WLAN_EID_FRAGMENT)
 387                         continue;
 388
 389                 if (sub->id == WLAN_EID_EXTENSION) {
 390                         if (sub->datalen < 1)
 391                                 continue;
 392
 393                         id = WLAN_EID_EXTENSION;
 394                         ext_id = sub->data[0];
 395                         match_len = 1;
 396
 397                         if (ext_id == WLAN_EID_EXT_NON_INHERITANCE)
 398                                 continue;
 399                 } else {
 400                         id = sub->id;
 401                         match_len = 0;
 402                 }
 403
 404                 /* Processed if one was included in the parent */
 405                 if (cfg80211_find_elem_match(id, ie, ielen,
 406                                              &ext_id, match_len, 0))
 407                         continue;
 408
 409                 if (!cfg80211_copy_elem_with_frags(sub, subie, subie_len,
 410                                                    &pos, new_ie, new_ie_len))
 411                         return 0;
 412         }
 413
 414         return pos - new_ie;
 415 }
 416
 417 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
 418                    const u8 *ssid, size_t ssid_len)
 419 {
 420         const struct cfg80211_bss_ies *ies;
 421         const struct element *ssid_elem;
 422
 423         if (bssid && !ether_addr_equal(a->bssid, bssid))
 424                 return false;
 425
 426         if (!ssid)
 427                 return true;
 428
 429         ies = rcu_access_pointer(a->ies);
 430         if (!ies)
 431                 return false;
 432         ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
 433         if (!ssid_elem)
 434                 return false;
 435         if (ssid_elem->datalen != ssid_len)
 436                 return false;
 437         return memcmp(ssid_elem->data, ssid, ssid_len) == 0;
 438 }
 439
 440 static int
 441 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
 442                            struct cfg80211_bss *nontrans_bss)
 443 {
 444         const struct element *ssid_elem;
 445         struct cfg80211_bss *bss = NULL;
 446
 447         rcu_read_lock();
 448         ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID);
 449         if (!ssid_elem) {
 450                 rcu_read_unlock();
 451                 return -EINVAL;
 452         }
 453
 454         /* check if nontrans_bss is in the list */
 455         list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
 456                 if (is_bss(bss, nontrans_bss->bssid, ssid_elem->data,
 457                            ssid_elem->datalen)) {
 458                         rcu_read_unlock();
 459                         return 0;
 460                 }
 461         }
 462
 463         rcu_read_unlock();
 464
 465         /*
 466          * This is a bit weird - it's not on the list, but already on another
 467          * one! The only way that could happen is if there's some BSSID/SSID
 468          * shared by multiple APs in their multi-BSSID profiles, potentially
 469          * with hidden SSID mixed in ... ignore it.
 470          */
 471         if (!list_empty(&nontrans_bss->nontrans_list))
 472                 return -EINVAL;
 473
 474         /* add to the list */
 475         list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
 476         return 0;
 477 }
 478
 479 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
 480                                   unsigned long expire_time)
 481 {
 482         struct cfg80211_internal_bss *bss, *tmp;
 483         bool expired = false;
 484
 485         lockdep_assert_held(&rdev->bss_lock);
 486
 487         list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
 488                 if (atomic_read(&bss->hold))
 489                         continue;
 490                 if (!time_after(expire_time, bss->ts))
 491                         continue;
 492
 493                 if (__cfg80211_unlink_bss(rdev, bss))
 494                         expired = true;
 495         }
 496
 497         if (expired)
 498                 rdev->bss_generation++;
 499 }
 500
 501 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
 502 {
 503         struct cfg80211_internal_bss *bss, *oldest = NULL;
 504         bool ret;
 505
 506         lockdep_assert_held(&rdev->bss_lock);
 507
 508         list_for_each_entry(bss, &rdev->bss_list, list) {
 509                 if (atomic_read(&bss->hold))
 510                         continue;
 511
 512                 if (!list_empty(&bss->hidden_list) &&
 513                     !bss->pub.hidden_beacon_bss)
 514                         continue;
 515
 516                 if (oldest && time_before(oldest->ts, bss->ts))
 517                         continue;
 518                 oldest = bss;
 519         }
 520
 521         if (WARN_ON(!oldest))
 522                 return false;
 523
 524         /*
 525          * The callers make sure to increase rdev->bss_generation if anything
 526          * gets removed (and a new entry added), so there's no need to also do
 527          * it here.
 528          */
 529
 530         ret = __cfg80211_unlink_bss(rdev, oldest);
 531         WARN_ON(!ret);
 532         return ret;
 533 }
 534
 535 static u8 cfg80211_parse_bss_param(u8 data,
 536                                    struct cfg80211_colocated_ap *coloc_ap)
 537 {
 538         coloc_ap->oct_recommended =
 539                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
 540         coloc_ap->same_ssid =
 541                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
 542         coloc_ap->multi_bss =
 543                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
 544         coloc_ap->transmitted_bssid =
 545                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
 546         coloc_ap->unsolicited_probe =
 547                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
 548         coloc_ap->colocated_ess =
 549                 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
 550
 551         return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
 552 }
 553
 554 static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
 555                                     const struct element **elem, u32 *s_ssid)
 556 {
 557
 558         *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
 559         if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
 560                 return -EINVAL;
 561
 562         *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
 563         return 0;
 564 }
 565
 566 static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
 567 {
 568         struct cfg80211_colocated_ap *ap, *tmp_ap;
 569
 570         list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
 571                 list_del(&ap->list);
 572                 kfree(ap);
 573         }
 574 }
 575
 576 static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
 577                                   const u8 *pos, u8 length,
 578                                   const struct element *ssid_elem,
 579                                   u32 s_ssid_tmp)
 580 {
 581         u8 bss_params;
 582
 583         entry->psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED;
 584
 585         /* The length is already verified by the caller to contain bss_params */
 586         if (length > sizeof(struct ieee80211_tbtt_info_7_8_9)) {
 587                 struct ieee80211_tbtt_info_ge_11 *tbtt_info = (void *)pos;
 588
 589                 memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN);
 590                 entry->short_ssid = le32_to_cpu(tbtt_info->short_ssid);
 591                 entry->short_ssid_valid = true;
 592
 593                 bss_params = tbtt_info->bss_params;
 594
 595                 /* Ignore disabled links */
 596                 if (length >= offsetofend(typeof(*tbtt_info), mld_params)) {
 597                         if (le16_get_bits(tbtt_info->mld_params.params,
 598                                           IEEE80211_RNR_MLD_PARAMS_DISABLED_LINK))
 599                                 return -EINVAL;
 600                 }
 601
 602                 if (length >= offsetofend(struct ieee80211_tbtt_info_ge_11,
 603                                           psd_20))
 604                         entry->psd_20 = tbtt_info->psd_20;
 605         } else {
 606                 struct ieee80211_tbtt_info_7_8_9 *tbtt_info = (void *)pos;
 607
 608                 memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN);
 609
 610                 bss_params = tbtt_info->bss_params;
 611
 612                 if (length == offsetofend(struct ieee80211_tbtt_info_7_8_9,
 613                                           psd_20))
 614                         entry->psd_20 = tbtt_info->psd_20;
 615         }
 616
 617         /* ignore entries with invalid BSSID */
 618         if (!is_valid_ether_addr(entry->bssid))
 619                 return -EINVAL;
 620
 621         /* skip non colocated APs */
 622         if (!cfg80211_parse_bss_param(bss_params, entry))
 623                 return -EINVAL;
 624
 625         /* no information about the short ssid. Consider the entry valid
 626          * for now. It would later be dropped in case there are explicit
 627          * SSIDs that need to be matched
 628          */
 629         if (!entry->same_ssid && !entry->short_ssid_valid)
 630                 return 0;
 631
 632         if (entry->same_ssid) {
 633                 entry->short_ssid = s_ssid_tmp;
 634                 entry->short_ssid_valid = true;
 635
 636                 /*
 637                  * This is safe because we validate datalen in
 638                  * cfg80211_parse_colocated_ap(), before calling this
 639                  * function.
 640                  */
 641                 memcpy(&entry->ssid, &ssid_elem->data, ssid_elem->datalen);
 642                 entry->ssid_len = ssid_elem->datalen;
 643         }
 644
 645         return 0;
 646 }
 647
 648 static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
 649                                        struct list_head *list)
 650 {
 651         struct ieee80211_neighbor_ap_info *ap_info;
 652         const struct element *elem, *ssid_elem;
 653         const u8 *pos, *end;
 654         u32 s_ssid_tmp;
 655         int n_coloc = 0, ret;
 656         LIST_HEAD(ap_list);
 657
 658         ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
 659         if (ret)
 660                 return 0;
 661
 662         for_each_element_id(elem, WLAN_EID_REDUCED_NEIGHBOR_REPORT,
 663                             ies->data, ies->len) {
 664                 pos = elem->data;
 665                 end = elem->data + elem->datalen;
 666
 667                 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
 668                 while (pos + sizeof(*ap_info) <= end) {
 669                         enum nl80211_band band;
 670                         int freq;
 671                         u8 length, i, count;
 672
 673                         ap_info = (void *)pos;
 674                         count = u8_get_bits(ap_info->tbtt_info_hdr,
 675                                             IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
 676                         length = ap_info->tbtt_info_len;
 677
 678                         pos += sizeof(*ap_info);
 679
 680                         if (!ieee80211_operating_class_to_band(ap_info->op_class,
 681                                                                &band))
 682                                 break;
 683
 684                         freq = ieee80211_channel_to_frequency(ap_info->channel,
 685                                                               band);
 686
 687                         if (end - pos < count * length)
 688                                 break;
 689
 690                         if (u8_get_bits(ap_info->tbtt_info_hdr,
 691                                         IEEE80211_AP_INFO_TBTT_HDR_TYPE) !=
 692                             IEEE80211_TBTT_INFO_TYPE_TBTT) {
 693                                 pos += count * length;
 694                                 continue;
 695                         }
 696
 697                         /* TBTT info must include bss param + BSSID +
 698                          * (short SSID or same_ssid bit to be set).
 699                          * ignore other options, and move to the
 700                          * next AP info
 701                          */
 702                         if (band != NL80211_BAND_6GHZ ||
 703                             !(length == offsetofend(struct ieee80211_tbtt_info_7_8_9,
 704                                                     bss_params) ||
 705                               length == sizeof(struct ieee80211_tbtt_info_7_8_9) ||
 706                               length >= offsetofend(struct ieee80211_tbtt_info_ge_11,
 707                                                     bss_params))) {
 708                                 pos += count * length;
 709                                 continue;
 710                         }
 711
 712                         for (i = 0; i < count; i++) {
 713                                 struct cfg80211_colocated_ap *entry;
 714
 715                                 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
 716                                                 GFP_ATOMIC);
 717
 718                                 if (!entry)
 719                                         goto error;
 720
 721                                 entry->center_freq = freq;
 722
 723                                 if (!cfg80211_parse_ap_info(entry, pos, length,
 724                                                             ssid_elem,
 725                                                             s_ssid_tmp)) {
 726                                         n_coloc++;
 727                                         list_add_tail(&entry->list, &ap_list);
 728                                 } else {
 729                                         kfree(entry);
 730                                 }
 731
 732                                 pos += length;
 733                         }
 734                 }
 735
 736 error:
 737                 if (pos != end) {
 738                         cfg80211_free_coloc_ap_list(&ap_list);
 739                         return 0;
 740                 }
 741         }
 742
 743         list_splice_tail(&ap_list, list);
 744         return n_coloc;
 745 }
 746
 747 static  void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
 748                                         struct ieee80211_channel *chan,
 749                                         bool add_to_6ghz)
 750 {
 751         int i;
 752         u32 n_channels = request->n_channels;
 753         struct cfg80211_scan_6ghz_params *params =
 754                 &request->scan_6ghz_params[request->n_6ghz_params];
 755
 756         for (i = 0; i < n_channels; i++) {
 757                 if (request->channels[i] == chan) {
 758                         if (add_to_6ghz)
 759                                 params->channel_idx = i;
 760                         return;
 761                 }
 762         }
 763
 764         request->channels[n_channels] = chan;
 765         if (add_to_6ghz)
 766                 request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
 767                         n_channels;
 768
 769         request->n_channels++;
 770 }
 771
 772 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
 773                                      struct cfg80211_scan_request *request)
 774 {
 775         int i;
 776         u32 s_ssid;
 777
 778         for (i = 0; i < request->n_ssids; i++) {
 779                 /* wildcard ssid in the scan request */
 780                 if (!request->ssids[i].ssid_len) {
 781                         if (ap->multi_bss && !ap->transmitted_bssid)
 782                                 continue;
 783
 784                         return true;
 785                 }
 786
 787                 if (ap->ssid_len &&
 788                     ap->ssid_len == request->ssids[i].ssid_len) {
 789                         if (!memcmp(request->ssids[i].ssid, ap->ssid,
 790                                     ap->ssid_len))
 791                                 return true;
 792                 } else if (ap->short_ssid_valid) {
 793                         s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
 794                                            request->ssids[i].ssid_len);
 795
 796                         if (ap->short_ssid == s_ssid)
 797                                 return true;
 798                 }
 799         }
 800
 801         return false;
 802 }
 803
 804 static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
 805 {
 806         u8 i;
 807         struct cfg80211_colocated_ap *ap;
 808         int n_channels, count = 0, err;
 809         struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
 810         LIST_HEAD(coloc_ap_list);
 811         bool need_scan_psc = true;
 812         const struct ieee80211_sband_iftype_data *iftd;
 813
 814         rdev_req->scan_6ghz = true;
 815
 816         if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
 817                 return -EOPNOTSUPP;
 818
 819         iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
 820                                                rdev_req->wdev->iftype);
 821         if (!iftd || !iftd->he_cap.has_he)
 822                 return -EOPNOTSUPP;
 823
 824         n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
 825
 826         if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
 827                 struct cfg80211_internal_bss *intbss;
 828
 829                 spin_lock_bh(&rdev->bss_lock);
 830                 list_for_each_entry(intbss, &rdev->bss_list, list) {
 831                         struct cfg80211_bss *res = &intbss->pub;
 832                         const struct cfg80211_bss_ies *ies;
 833
 834                         ies = rcu_access_pointer(res->ies);
 835                         count += cfg80211_parse_colocated_ap(ies,
 836                                                              &coloc_ap_list);
 837                 }
 838                 spin_unlock_bh(&rdev->bss_lock);
 839         }
 840
 841         request = kzalloc(struct_size(request, channels, n_channels) +
 842                           sizeof(*request->scan_6ghz_params) * count +
 843                           sizeof(*request->ssids) * rdev_req->n_ssids,
 844                           GFP_KERNEL);
 845         if (!request) {
 846                 cfg80211_free_coloc_ap_list(&coloc_ap_list);
 847                 return -ENOMEM;
 848         }
 849
 850         *request = *rdev_req;
 851         request->n_channels = 0;
 852         request->scan_6ghz_params =
 853                 (void *)&request->channels[n_channels];
 854
 855         /*
 856          * PSC channels should not be scanned in case of direct scan with 1 SSID
 857          * and at least one of the reported co-located APs with same SSID
 858          * indicating that all APs in the same ESS are co-located
 859          */
 860         if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
 861                 list_for_each_entry(ap, &coloc_ap_list, list) {
 862                         if (ap->colocated_ess &&
 863                             cfg80211_find_ssid_match(ap, request)) {
 864                                 need_scan_psc = false;
 865                                 break;
 866                         }
 867                 }
 868         }
 869
 870         /*
 871          * add to the scan request the channels that need to be scanned
 872          * regardless of the collocated APs (PSC channels or all channels
 873          * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
 874          */
 875         for (i = 0; i < rdev_req->n_channels; i++) {
 876                 if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
 877                     ((need_scan_psc &&
 878                       cfg80211_channel_is_psc(rdev_req->channels[i])) ||
 879                      !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
 880                         cfg80211_scan_req_add_chan(request,
 881                                                    rdev_req->channels[i],
 882                                                    false);
 883                 }
 884         }
 885
 886         if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
 887                 goto skip;
 888
 889         list_for_each_entry(ap, &coloc_ap_list, list) {
 890                 bool found = false;
 891                 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
 892                         &request->scan_6ghz_params[request->n_6ghz_params];
 893                 struct ieee80211_channel *chan =
 894                         ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
 895
 896                 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
 897                         continue;
 898
 899                 for (i = 0; i < rdev_req->n_channels; i++) {
 900                         if (rdev_req->channels[i] == chan)
 901                                 found = true;
 902                 }
 903
 904                 if (!found)
 905                         continue;
 906
 907                 if (request->n_ssids > 0 &&
 908                     !cfg80211_find_ssid_match(ap, request))
 909                         continue;
 910
 911                 if (!is_broadcast_ether_addr(request->bssid) &&
 912                     !ether_addr_equal(request->bssid, ap->bssid))
 913                         continue;
 914
 915                 if (!request->n_ssids && ap->multi_bss && !ap->transmitted_bssid)
 916                         continue;
 917
 918                 cfg80211_scan_req_add_chan(request, chan, true);
 919                 memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
 920                 scan_6ghz_params->short_ssid = ap->short_ssid;
 921                 scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
 922                 scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
 923                 scan_6ghz_params->psd_20 = ap->psd_20;
 924
 925                 /*
 926                  * If a PSC channel is added to the scan and 'need_scan_psc' is
 927                  * set to false, then all the APs that the scan logic is
 928                  * interested with on the channel are collocated and thus there
 929                  * is no need to perform the initial PSC channel listen.
 930                  */
 931                 if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
 932                         scan_6ghz_params->psc_no_listen = true;
 933
 934                 request->n_6ghz_params++;
 935         }
 936
 937 skip:
 938         cfg80211_free_coloc_ap_list(&coloc_ap_list);
 939
 940         if (request->n_channels) {
 941                 struct cfg80211_scan_request *old = rdev->int_scan_req;
 942                 rdev->int_scan_req = request;
 943
 944                 /*
 945                  * Add the ssids from the parent scan request to the new scan
 946                  * request, so the driver would be able to use them in its
 947                  * probe requests to discover hidden APs on PSC channels.
 948                  */
 949                 request->ssids = (void *)&request->channels[request->n_channels];
 950                 request->n_ssids = rdev_req->n_ssids;
 951                 memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) *
 952                        request->n_ssids);
 953
 954                 /*
 955                  * If this scan follows a previous scan, save the scan start
 956                  * info from the first part of the scan
 957                  */
 958                 if (old)
 959                         rdev->int_scan_req->info = old->info;
 960
 961                 err = rdev_scan(rdev, request);
 962                 if (err) {
 963                         rdev->int_scan_req = old;
 964                         kfree(request);
 965                 } else {
 966                         kfree(old);
 967                 }
 968
 969                 return err;
 970         }
 971
 972         kfree(request);
 973         return -EINVAL;
 974 }
 975
 976 int cfg80211_scan(struct cfg80211_registered_device *rdev)
 977 {
 978         struct cfg80211_scan_request *request;
 979         struct cfg80211_scan_request *rdev_req = rdev->scan_req;
 980         u32 n_channels = 0, idx, i;
 981
 982         if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
 983                 return rdev_scan(rdev, rdev_req);
 984
 985         for (i = 0; i < rdev_req->n_channels; i++) {
 986                 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
 987                         n_channels++;
 988         }
 989
 990         if (!n_channels)
 991                 return cfg80211_scan_6ghz(rdev);
 992
 993         request = kzalloc(struct_size(request, channels, n_channels),
 994                           GFP_KERNEL);
 995         if (!request)
 996                 return -ENOMEM;
 997
 998         *request = *rdev_req;
 999         request->n_channels = n_channels;
1000
1001         for (i = idx = 0; i < rdev_req->n_channels; i++) {
1002                 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
1003                         request->channels[idx++] = rdev_req->channels[i];
1004         }
1005
1006         rdev_req->scan_6ghz = false;
1007         rdev->int_scan_req = request;
1008         return rdev_scan(rdev, request);
1009 }
1010
1011 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
1012                            bool send_message)
1013 {
1014         struct cfg80211_scan_request *request, *rdev_req;
1015         struct wireless_dev *wdev;
1016         struct sk_buff *msg;
1017 #ifdef CONFIG_CFG80211_WEXT
1018         union iwreq_data wrqu;
1019 #endif
1020
1021         lockdep_assert_held(&rdev->wiphy.mtx);
1022
1023         if (rdev->scan_msg) {
1024                 nl80211_send_scan_msg(rdev, rdev->scan_msg);
1025                 rdev->scan_msg = NULL;
1026                 return;
1027         }
1028
1029         rdev_req = rdev->scan_req;
1030         if (!rdev_req)
1031                 return;
1032
1033         wdev = rdev_req->wdev;
1034         request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
1035
1036         if (wdev_running(wdev) &&
1037             (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
1038             !rdev_req->scan_6ghz && !request->info.aborted &&
1039             !cfg80211_scan_6ghz(rdev))
1040                 return;
1041
1042         /*
1043          * This must be before sending the other events!
1044          * Otherwise, wpa_supplicant gets completely confused with
1045          * wext events.
1046          */
1047         if (wdev->netdev)
1048                 cfg80211_sme_scan_done(wdev->netdev);
1049
1050         if (!request->info.aborted &&
1051             request->flags & NL80211_SCAN_FLAG_FLUSH) {
1052                 /* flush entries from previous scans */
1053                 spin_lock_bh(&rdev->bss_lock);
1054                 __cfg80211_bss_expire(rdev, request->scan_start);
1055                 spin_unlock_bh(&rdev->bss_lock);
1056         }
1057
1058         msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
1059
1060 #ifdef CONFIG_CFG80211_WEXT
1061         if (wdev->netdev && !request->info.aborted) {
1062                 memset(&wrqu, 0, sizeof(wrqu));
1063
1064                 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
1065         }
1066 #endif
1067
1068         dev_put(wdev->netdev);
1069
1070         kfree(rdev->int_scan_req);
1071         rdev->int_scan_req = NULL;
1072
1073         kfree(rdev->scan_req);
1074         rdev->scan_req = NULL;
1075
1076         if (!send_message)
1077                 rdev->scan_msg = msg;
1078         else
1079                 nl80211_send_scan_msg(rdev, msg);
1080 }
1081
1082 void __cfg80211_scan_done(struct wiphy *wiphy, struct wiphy_work *wk)
1083 {
1084         ___cfg80211_scan_done(wiphy_to_rdev(wiphy), true);
1085 }
1086
1087 void cfg80211_scan_done(struct cfg80211_scan_request *request,
1088                         struct cfg80211_scan_info *info)
1089 {
1090         struct cfg80211_scan_info old_info = request->info;
1091
1092         trace_cfg80211_scan_done(request, info);
1093         WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
1094                 request != wiphy_to_rdev(request->wiphy)->int_scan_req);
1095
1096         request->info = *info;
1097
1098         /*
1099          * In case the scan is split, the scan_start_tsf and tsf_bssid should
1100          * be of the first part. In such a case old_info.scan_start_tsf should
1101          * be non zero.
1102          */
1103         if (request->scan_6ghz && old_info.scan_start_tsf) {
1104                 request->info.scan_start_tsf = old_info.scan_start_tsf;
1105                 memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
1106                        sizeof(request->info.tsf_bssid));
1107         }
1108
1109         request->notified = true;
1110         wiphy_work_queue(request->wiphy,
1111                          &wiphy_to_rdev(request->wiphy)->scan_done_wk);
1112 }
1113 EXPORT_SYMBOL(cfg80211_scan_done);
1114
1115 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
1116                                  struct cfg80211_sched_scan_request *req)
1117 {
1118         lockdep_assert_held(&rdev->wiphy.mtx);
1119
1120         list_add_rcu(&req->list, &rdev->sched_scan_req_list);
1121 }
1122
1123 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
1124                                         struct cfg80211_sched_scan_request *req)
1125 {
1126         lockdep_assert_held(&rdev->wiphy.mtx);
1127
1128         list_del_rcu(&req->list);
1129         kfree_rcu(req, rcu_head);
1130 }
1131
1132 static struct cfg80211_sched_scan_request *
1133 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
1134 {
1135         struct cfg80211_sched_scan_request *pos;
1136
1137         list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
1138                                 lockdep_is_held(&rdev->wiphy.mtx)) {
1139                 if (pos->reqid == reqid)
1140                         return pos;
1141         }
1142         return NULL;
1143 }
1144
1145 /*
1146  * Determines if a scheduled scan request can be handled. When a legacy
1147  * scheduled scan is running no other scheduled scan is allowed regardless
1148  * whether the request is for legacy or multi-support scan. When a multi-support
1149  * scheduled scan is running a request for legacy scan is not allowed. In this
1150  * case a request for multi-support scan can be handled if resources are
1151  * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
1152  */
1153 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
1154                                      bool want_multi)
1155 {
1156         struct cfg80211_sched_scan_request *pos;
1157         int i = 0;
1158
1159         list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
1160                 /* request id zero means legacy in progress */
1161                 if (!i && !pos->reqid)
1162                         return -EINPROGRESS;
1163                 i++;
1164         }
1165
1166         if (i) {
1167                 /* no legacy allowed when multi request(s) are active */
1168                 if (!want_multi)
1169                         return -EINPROGRESS;
1170
1171                 /* resource limit reached */
1172                 if (i == rdev->wiphy.max_sched_scan_reqs)
1173                         return -ENOSPC;
1174         }
1175         return 0;
1176 }
1177
1178 void cfg80211_sched_scan_results_wk(struct work_struct *work)
1179 {
1180         struct cfg80211_registered_device *rdev;
1181         struct cfg80211_sched_scan_request *req, *tmp;
1182
1183         rdev = container_of(work, struct cfg80211_registered_device,
1184                            sched_scan_res_wk);
1185
1186         wiphy_lock(&rdev->wiphy);
1187         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
1188                 if (req->report_results) {
1189                         req->report_results = false;
1190                         if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
1191                                 /* flush entries from previous scans */
1192                                 spin_lock_bh(&rdev->bss_lock);
1193                                 __cfg80211_bss_expire(rdev, req->scan_start);
1194                                 spin_unlock_bh(&rdev->bss_lock);
1195                                 req->scan_start = jiffies;
1196                         }
1197                         nl80211_send_sched_scan(req,
1198                                                 NL80211_CMD_SCHED_SCAN_RESULTS);
1199                 }
1200         }
1201         wiphy_unlock(&rdev->wiphy);
1202 }
1203
1204 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
1205 {
1206         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1207         struct cfg80211_sched_scan_request *request;
1208
1209         trace_cfg80211_sched_scan_results(wiphy, reqid);
1210         /* ignore if we're not scanning */
1211
1212         rcu_read_lock();
1213         request = cfg80211_find_sched_scan_req(rdev, reqid);
1214         if (request) {
1215                 request->report_results = true;
1216                 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
1217         }
1218         rcu_read_unlock();
1219 }
1220 EXPORT_SYMBOL(cfg80211_sched_scan_results);
1221
1222 void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid)
1223 {
1224         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1225
1226         lockdep_assert_held(&wiphy->mtx);
1227
1228         trace_cfg80211_sched_scan_stopped(wiphy, reqid);
1229
1230         __cfg80211_stop_sched_scan(rdev, reqid, true);
1231 }
1232 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
1233
1234 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
1235 {
1236         wiphy_lock(wiphy);
1237         cfg80211_sched_scan_stopped_locked(wiphy, reqid);
1238         wiphy_unlock(wiphy);
1239 }
1240 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
1241
1242 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
1243                                  struct cfg80211_sched_scan_request *req,
1244                                  bool driver_initiated)
1245 {
1246         lockdep_assert_held(&rdev->wiphy.mtx);
1247
1248         if (!driver_initiated) {
1249                 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
1250                 if (err)
1251                         return err;
1252         }
1253
1254         nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
1255
1256         cfg80211_del_sched_scan_req(rdev, req);
1257
1258         return 0;
1259 }
1260
1261 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
1262                                u64 reqid, bool driver_initiated)
1263 {
1264         struct cfg80211_sched_scan_request *sched_scan_req;
1265
1266         lockdep_assert_held(&rdev->wiphy.mtx);
1267
1268         sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
1269         if (!sched_scan_req)
1270                 return -ENOENT;
1271
1272         return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
1273                                             driver_initiated);
1274 }
1275
1276 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
1277                       unsigned long age_secs)
1278 {
1279         struct cfg80211_internal_bss *bss;
1280         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
1281
1282         spin_lock_bh(&rdev->bss_lock);
1283         list_for_each_entry(bss, &rdev->bss_list, list)
1284                 bss->ts -= age_jiffies;
1285         spin_unlock_bh(&rdev->bss_lock);
1286 }
1287
1288 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
1289 {
1290         __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
1291 }
1292
1293 void cfg80211_bss_flush(struct wiphy *wiphy)
1294 {
1295         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1296
1297         spin_lock_bh(&rdev->bss_lock);
1298         __cfg80211_bss_expire(rdev, jiffies);
1299         spin_unlock_bh(&rdev->bss_lock);
1300 }
1301 EXPORT_SYMBOL(cfg80211_bss_flush);
1302
1303 const struct element *
1304 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
1305                          const u8 *match, unsigned int match_len,
1306                          unsigned int match_offset)
1307 {
1308         const struct element *elem;
1309
1310         for_each_element_id(elem, eid, ies, len) {
1311                 if (elem->datalen >= match_offset + match_len &&
1312                     !memcmp(elem->data + match_offset, match, match_len))
1313                         return elem;
1314         }
1315
1316         return NULL;
1317 }
1318 EXPORT_SYMBOL(cfg80211_find_elem_match);
1319
1320 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
1321                                                 const u8 *ies,
1322                                                 unsigned int len)
1323 {
1324         const struct element *elem;
1325         u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
1326         int match_len = (oui_type < 0) ? 3 : sizeof(match);
1327
1328         if (WARN_ON(oui_type > 0xff))
1329                 return NULL;
1330
1331         elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
1332                                         match, match_len, 0);
1333
1334         if (!elem || elem->datalen < 4)
1335                 return NULL;
1336
1337         return elem;
1338 }
1339 EXPORT_SYMBOL(cfg80211_find_vendor_elem);
1340
1341 /**
1342  * enum bss_compare_mode - BSS compare mode
1343  * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
1344  * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
1345  * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
1346  */
1347 enum bss_compare_mode {
1348         BSS_CMP_REGULAR,
1349         BSS_CMP_HIDE_ZLEN,
1350         BSS_CMP_HIDE_NUL,
1351 };
1352
1353 static int cmp_bss(struct cfg80211_bss *a,
1354                    struct cfg80211_bss *b,
1355                    enum bss_compare_mode mode)
1356 {
1357         const struct cfg80211_bss_ies *a_ies, *b_ies;
1358         const u8 *ie1 = NULL;
1359         const u8 *ie2 = NULL;
1360         int i, r;
1361
1362         if (a->channel != b->channel)
1363                 return (b->channel->center_freq * 1000 + b->channel->freq_offset) -
1364                        (a->channel->center_freq * 1000 + a->channel->freq_offset);
1365
1366         a_ies = rcu_access_pointer(a->ies);
1367         if (!a_ies)
1368                 return -1;
1369         b_ies = rcu_access_pointer(b->ies);
1370         if (!b_ies)
1371                 return 1;
1372
1373         if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
1374                 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1375                                        a_ies->data, a_ies->len);
1376         if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
1377                 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1378                                        b_ies->data, b_ies->len);
1379         if (ie1 && ie2) {
1380                 int mesh_id_cmp;
1381
1382                 if (ie1[1] == ie2[1])
1383                         mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1384                 else
1385                         mesh_id_cmp = ie2[1] - ie1[1];
1386
1387                 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1388                                        a_ies->data, a_ies->len);
1389                 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1390                                        b_ies->data, b_ies->len);
1391                 if (ie1 && ie2) {
1392                         if (mesh_id_cmp)
1393                                 return mesh_id_cmp;
1394                         if (ie1[1] != ie2[1])
1395                                 return ie2[1] - ie1[1];
1396                         return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1397                 }
1398         }
1399
1400         r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
1401         if (r)
1402                 return r;
1403
1404         ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
1405         ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
1406
1407         if (!ie1 && !ie2)
1408                 return 0;
1409
1410         /*
1411          * Note that with "hide_ssid", the function returns a match if
1412          * the already-present BSS ("b") is a hidden SSID beacon for
1413          * the new BSS ("a").
1414          */
1415
1416         /* sort missing IE before (left of) present IE */
1417         if (!ie1)
1418                 return -1;
1419         if (!ie2)
1420                 return 1;
1421
1422         switch (mode) {
1423         case BSS_CMP_HIDE_ZLEN:
1424                 /*
1425                  * In ZLEN mode we assume the BSS entry we're
1426                  * looking for has a zero-length SSID. So if
1427                  * the one we're looking at right now has that,
1428                  * return 0. Otherwise, return the difference
1429                  * in length, but since we're looking for the
1430                  * 0-length it's really equivalent to returning
1431                  * the length of the one we're looking at.
1432                  *
1433                  * No content comparison is needed as we assume
1434                  * the content length is zero.
1435                  */
1436                 return ie2[1];
1437         case BSS_CMP_REGULAR:
1438         default:
1439                 /* sort by length first, then by contents */
1440                 if (ie1[1] != ie2[1])
1441                         return ie2[1] - ie1[1];
1442                 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1443         case BSS_CMP_HIDE_NUL:
1444                 if (ie1[1] != ie2[1])
1445                         return ie2[1] - ie1[1];
1446                 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
1447                 for (i = 0; i < ie2[1]; i++)
1448                         if (ie2[i + 2])
1449                                 return -1;
1450                 return 0;
1451         }
1452 }
1453
1454 static bool cfg80211_bss_type_match(u16 capability,
1455                                     enum nl80211_band band,
1456                                     enum ieee80211_bss_type bss_type)
1457 {
1458         bool ret = true;
1459         u16 mask, val;
1460
1461         if (bss_type == IEEE80211_BSS_TYPE_ANY)
1462                 return ret;
1463
1464         if (band == NL80211_BAND_60GHZ) {
1465                 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
1466                 switch (bss_type) {
1467                 case IEEE80211_BSS_TYPE_ESS:
1468                         val = WLAN_CAPABILITY_DMG_TYPE_AP;
1469                         break;
1470                 case IEEE80211_BSS_TYPE_PBSS:
1471                         val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
1472                         break;
1473                 case IEEE80211_BSS_TYPE_IBSS:
1474                         val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
1475                         break;
1476                 default:
1477                         return false;
1478                 }
1479         } else {
1480                 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
1481                 switch (bss_type) {
1482                 case IEEE80211_BSS_TYPE_ESS:
1483                         val = WLAN_CAPABILITY_ESS;
1484                         break;
1485                 case IEEE80211_BSS_TYPE_IBSS:
1486                         val = WLAN_CAPABILITY_IBSS;
1487                         break;
1488                 case IEEE80211_BSS_TYPE_MBSS:
1489                         val = 0;
1490                         break;
1491                 default:
1492                         return false;
1493                 }
1494         }
1495
1496         ret = ((capability & mask) == val);
1497         return ret;
1498 }
1499
1500 /* Returned bss is reference counted and must be cleaned up appropriately. */
1501 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
1502                                       struct ieee80211_channel *channel,
1503                                       const u8 *bssid,
1504                                       const u8 *ssid, size_t ssid_len,
1505                                       enum ieee80211_bss_type bss_type,
1506                                       enum ieee80211_privacy privacy)
1507 {
1508         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1509         struct cfg80211_internal_bss *bss, *res = NULL;
1510         unsigned long now = jiffies;
1511         int bss_privacy;
1512
1513         trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
1514                                privacy);
1515
1516         spin_lock_bh(&rdev->bss_lock);
1517
1518         list_for_each_entry(bss, &rdev->bss_list, list) {
1519                 if (!cfg80211_bss_type_match(bss->pub.capability,
1520                                              bss->pub.channel->band, bss_type))
1521                         continue;
1522
1523                 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
1524                 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
1525                     (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
1526                         continue;
1527                 if (channel && bss->pub.channel != channel)
1528                         continue;
1529                 if (!is_valid_ether_addr(bss->pub.bssid))
1530                         continue;
1531                 /* Don't get expired BSS structs */
1532                 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
1533                     !atomic_read(&bss->hold))
1534                         continue;
1535                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
1536                         res = bss;
1537                         bss_ref_get(rdev, res);
1538                         break;
1539                 }
1540         }
1541
1542         spin_unlock_bh(&rdev->bss_lock);
1543         if (!res)
1544                 return NULL;
1545         trace_cfg80211_return_bss(&res->pub);
1546         return &res->pub;
1547 }
1548 EXPORT_SYMBOL(cfg80211_get_bss);
1549
1550 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
1551                           struct cfg80211_internal_bss *bss)
1552 {
1553         struct rb_node **p = &rdev->bss_tree.rb_node;
1554         struct rb_node *parent = NULL;
1555         struct cfg80211_internal_bss *tbss;
1556         int cmp;
1557
1558         while (*p) {
1559                 parent = *p;
1560                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
1561
1562                 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
1563
1564                 if (WARN_ON(!cmp)) {
1565                         /* will sort of leak this BSS */
1566                         return;
1567                 }
1568
1569                 if (cmp < 0)
1570                         p = &(*p)->rb_left;
1571                 else
1572                         p = &(*p)->rb_right;
1573         }
1574
1575         rb_link_node(&bss->rbn, parent, p);
1576         rb_insert_color(&bss->rbn, &rdev->bss_tree);
1577 }
1578
1579 static struct cfg80211_internal_bss *
1580 rb_find_bss(struct cfg80211_registered_device *rdev,
1581             struct cfg80211_internal_bss *res,
1582             enum bss_compare_mode mode)
1583 {
1584         struct rb_node *n = rdev->bss_tree.rb_node;
1585         struct cfg80211_internal_bss *bss;
1586         int r;
1587
1588         while (n) {
1589                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1590                 r = cmp_bss(&res->pub, &bss->pub, mode);
1591
1592                 if (r == 0)
1593                         return bss;
1594                 else if (r < 0)
1595                         n = n->rb_left;
1596                 else
1597                         n = n->rb_right;
1598         }
1599
1600         return NULL;
1601 }
1602
1603 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1604                                    struct cfg80211_internal_bss *new)
1605 {
1606         const struct cfg80211_bss_ies *ies;
1607         struct cfg80211_internal_bss *bss;
1608         const u8 *ie;
1609         int i, ssidlen;
1610         u8 fold = 0;
1611         u32 n_entries = 0;
1612
1613         ies = rcu_access_pointer(new->pub.beacon_ies);
1614         if (WARN_ON(!ies))
1615                 return false;
1616
1617         ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1618         if (!ie) {
1619                 /* nothing to do */
1620                 return true;
1621         }
1622
1623         ssidlen = ie[1];
1624         for (i = 0; i < ssidlen; i++)
1625                 fold |= ie[2 + i];
1626
1627         if (fold) {
1628                 /* not a hidden SSID */
1629                 return true;
1630         }
1631
1632         /* This is the bad part ... */
1633
1634         list_for_each_entry(bss, &rdev->bss_list, list) {
1635                 /*
1636                  * we're iterating all the entries anyway, so take the
1637                  * opportunity to validate the list length accounting
1638                  */
1639                 n_entries++;
1640
1641                 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1642                         continue;
1643                 if (bss->pub.channel != new->pub.channel)
1644                         continue;
1645                 if (bss->pub.scan_width != new->pub.scan_width)
1646                         continue;
1647                 if (rcu_access_pointer(bss->pub.beacon_ies))
1648                         continue;
1649                 ies = rcu_access_pointer(bss->pub.ies);
1650                 if (!ies)
1651                         continue;
1652                 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1653                 if (!ie)
1654                         continue;
1655                 if (ssidlen && ie[1] != ssidlen)
1656                         continue;
1657                 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1658                         continue;
1659                 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1660                         list_del(&bss->hidden_list);
1661                 /* combine them */
1662                 list_add(&bss->hidden_list, &new->hidden_list);
1663                 bss->pub.hidden_beacon_bss = &new->pub;
1664                 new->refcount += bss->refcount;
1665                 rcu_assign_pointer(bss->pub.beacon_ies,
1666                                    new->pub.beacon_ies);
1667         }
1668
1669         WARN_ONCE(n_entries != rdev->bss_entries,
1670                   "rdev bss entries[%d]/list[len:%d] corruption\n",
1671                   rdev->bss_entries, n_entries);
1672
1673         return true;
1674 }
1675
1676 static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known,
1677                                          const struct cfg80211_bss_ies *new_ies,
1678                                          const struct cfg80211_bss_ies *old_ies)
1679 {
1680         struct cfg80211_internal_bss *bss;
1681
1682         /* Assign beacon IEs to all sub entries */
1683         list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1684                 const struct cfg80211_bss_ies *ies;
1685
1686                 ies = rcu_access_pointer(bss->pub.beacon_ies);
1687                 WARN_ON(ies != old_ies);
1688
1689                 rcu_assign_pointer(bss->pub.beacon_ies, new_ies);
1690         }
1691 }
1692
1693 static bool
1694 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1695                           struct cfg80211_internal_bss *known,
1696                           struct cfg80211_internal_bss *new,
1697                           bool signal_valid)
1698 {
1699         lockdep_assert_held(&rdev->bss_lock);
1700
1701         /* Update IEs */
1702         if (rcu_access_pointer(new->pub.proberesp_ies)) {
1703                 const struct cfg80211_bss_ies *old;
1704
1705                 old = rcu_access_pointer(known->pub.proberesp_ies);
1706
1707                 rcu_assign_pointer(known->pub.proberesp_ies,
1708                                    new->pub.proberesp_ies);
1709                 /* Override possible earlier Beacon frame IEs */
1710                 rcu_assign_pointer(known->pub.ies,
1711                                    new->pub.proberesp_ies);
1712                 if (old)
1713                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1714         } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1715                 const struct cfg80211_bss_ies *old;
1716
1717                 if (known->pub.hidden_beacon_bss &&
1718                     !list_empty(&known->hidden_list)) {
1719                         const struct cfg80211_bss_ies *f;
1720
1721                         /* The known BSS struct is one of the probe
1722                          * response members of a group, but we're
1723                          * receiving a beacon (beacon_ies in the new
1724                          * bss is used). This can only mean that the
1725                          * AP changed its beacon from not having an
1726                          * SSID to showing it, which is confusing so
1727                          * drop this information.
1728                          */
1729
1730                         f = rcu_access_pointer(new->pub.beacon_ies);
1731                         kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1732                         return false;
1733                 }
1734
1735                 old = rcu_access_pointer(known->pub.beacon_ies);
1736
1737                 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1738
1739                 /* Override IEs if they were from a beacon before */
1740                 if (old == rcu_access_pointer(known->pub.ies))
1741                         rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1742
1743                 cfg80211_update_hidden_bsses(known,
1744                                              rcu_access_pointer(new->pub.beacon_ies),
1745                                              old);
1746
1747                 if (old)
1748                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1749         }
1750
1751         known->pub.beacon_interval = new->pub.beacon_interval;
1752
1753         /* don't update the signal if beacon was heard on
1754          * adjacent channel.
1755          */
1756         if (signal_valid)
1757                 known->pub.signal = new->pub.signal;
1758         known->pub.capability = new->pub.capability;
1759         known->ts = new->ts;
1760         known->ts_boottime = new->ts_boottime;
1761         known->parent_tsf = new->parent_tsf;
1762         known->pub.chains = new->pub.chains;
1763         memcpy(known->pub.chain_signal, new->pub.chain_signal,
1764                IEEE80211_MAX_CHAINS);
1765         ether_addr_copy(known->parent_bssid, new->parent_bssid);
1766         known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1767         known->pub.bssid_index = new->pub.bssid_index;
1768
1769         return true;
1770 }
1771
1772 /* Returned bss is reference counted and must be cleaned up appropriately. */
1773 static struct cfg80211_internal_bss *
1774 __cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1775                       struct cfg80211_internal_bss *tmp,
1776                       bool signal_valid, unsigned long ts)
1777 {
1778         struct cfg80211_internal_bss *found = NULL;
1779
1780         if (WARN_ON(!tmp->pub.channel))
1781                 return NULL;
1782
1783         tmp->ts = ts;
1784
1785         if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1786                 return NULL;
1787         }
1788
1789         found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1790
1791         if (found) {
1792                 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1793                         return NULL;
1794         } else {
1795                 struct cfg80211_internal_bss *new;
1796                 struct cfg80211_internal_bss *hidden;
1797                 struct cfg80211_bss_ies *ies;
1798
1799                 /*
1800                  * create a copy -- the "res" variable that is passed in
1801                  * is allocated on the stack since it's not needed in the
1802                  * more common case of an update
1803                  */
1804                 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1805                               GFP_ATOMIC);
1806                 if (!new) {
1807                         ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1808                         if (ies)
1809                                 kfree_rcu(ies, rcu_head);
1810                         ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1811                         if (ies)
1812                                 kfree_rcu(ies, rcu_head);
1813                         return NULL;
1814                 }
1815                 memcpy(new, tmp, sizeof(*new));
1816                 new->refcount = 1;
1817                 INIT_LIST_HEAD(&new->hidden_list);
1818                 INIT_LIST_HEAD(&new->pub.nontrans_list);
1819                 /* we'll set this later if it was non-NULL */
1820                 new->pub.transmitted_bss = NULL;
1821
1822                 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1823                         hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1824                         if (!hidden)
1825                                 hidden = rb_find_bss(rdev, tmp,
1826                                                      BSS_CMP_HIDE_NUL);
1827                         if (hidden) {
1828                                 new->pub.hidden_beacon_bss = &hidden->pub;
1829                                 list_add(&new->hidden_list,
1830                                          &hidden->hidden_list);
1831                                 hidden->refcount++;
1832                                 rcu_assign_pointer(new->pub.beacon_ies,
1833                                                    hidden->pub.beacon_ies);
1834                         }
1835                 } else {
1836                         /*
1837                          * Ok so we found a beacon, and don't have an entry. If
1838                          * it's a beacon with hidden SSID, we might be in for an
1839                          * expensive search for any probe responses that should
1840                          * be grouped with this beacon for updates ...
1841                          */
1842                         if (!cfg80211_combine_bsses(rdev, new)) {
1843                                 bss_ref_put(rdev, new);
1844                                 return NULL;
1845                         }
1846                 }
1847
1848                 if (rdev->bss_entries >= bss_entries_limit &&
1849                     !cfg80211_bss_expire_oldest(rdev)) {
1850                         bss_ref_put(rdev, new);
1851                         return NULL;
1852                 }
1853
1854                 /* This must be before the call to bss_ref_get */
1855                 if (tmp->pub.transmitted_bss) {
1856                         new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1857                         bss_ref_get(rdev, bss_from_pub(tmp->pub.transmitted_bss));
1858                 }
1859
1860                 list_add_tail(&new->list, &rdev->bss_list);
1861                 rdev->bss_entries++;
1862                 rb_insert_bss(rdev, new);
1863                 found = new;
1864         }
1865
1866         rdev->bss_generation++;
1867         bss_ref_get(rdev, found);
1868
1869         return found;
1870 }
1871
1872 struct cfg80211_internal_bss *
1873 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1874                     struct cfg80211_internal_bss *tmp,
1875                     bool signal_valid, unsigned long ts)
1876 {
1877         struct cfg80211_internal_bss *res;
1878
1879         spin_lock_bh(&rdev->bss_lock);
1880         res = __cfg80211_bss_update(rdev, tmp, signal_valid, ts);
1881         spin_unlock_bh(&rdev->bss_lock);
1882
1883         return res;
1884 }
1885
1886 int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
1887                                     enum nl80211_band band)
1888 {
1889         const struct element *tmp;
1890
1891         if (band == NL80211_BAND_6GHZ) {
1892                 struct ieee80211_he_operation *he_oper;
1893
1894                 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie,
1895                                              ielen);
1896                 if (tmp && tmp->datalen >= sizeof(*he_oper) &&
1897                     tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) {
1898                         const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
1899
1900                         he_oper = (void *)&tmp->data[1];
1901
1902                         he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
1903                         if (!he_6ghz_oper)
1904                                 return -1;
1905
1906                         return he_6ghz_oper->primary;
1907                 }
1908         } else if (band == NL80211_BAND_S1GHZ) {
1909                 tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen);
1910                 if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) {
1911                         struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data;
1912
1913                         return s1gop->oper_ch;
1914                 }
1915         } else {
1916                 tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen);
1917                 if (tmp && tmp->datalen == 1)
1918                         return tmp->data[0];
1919
1920                 tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen);
1921                 if (tmp &&
1922                     tmp->datalen >= sizeof(struct ieee80211_ht_operation)) {
1923                         struct ieee80211_ht_operation *htop = (void *)tmp->data;
1924
1925                         return htop->primary_chan;
1926                 }
1927         }
1928
1929         return -1;
1930 }
1931 EXPORT_SYMBOL(cfg80211_get_ies_channel_number);
1932
1933 /*
1934  * Update RX channel information based on the available frame payload
1935  * information. This is mainly for the 2.4 GHz band where frames can be received
1936  * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1937  * element to indicate the current (transmitting) channel, but this might also
1938  * be needed on other bands if RX frequency does not match with the actual
1939  * operating channel of a BSS, or if the AP reports a different primary channel.
1940  */
1941 static struct ieee80211_channel *
1942 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1943                          struct ieee80211_channel *channel,
1944                          enum nl80211_bss_scan_width scan_width)
1945 {
1946         u32 freq;
1947         int channel_number;
1948         struct ieee80211_channel *alt_channel;
1949
1950         channel_number = cfg80211_get_ies_channel_number(ie, ielen,
1951                                                          channel->band);
1952
1953         if (channel_number < 0) {
1954                 /* No channel information in frame payload */
1955                 return channel;
1956         }
1957
1958         freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
1959
1960         /*
1961          * Frame info (beacon/prob res) is the same as received channel,
1962          * no need for further processing.
1963          */
1964         if (freq == ieee80211_channel_to_khz(channel))
1965                 return channel;
1966
1967         alt_channel = ieee80211_get_channel_khz(wiphy, freq);
1968         if (!alt_channel) {
1969                 if (channel->band == NL80211_BAND_2GHZ ||
1970                     channel->band == NL80211_BAND_6GHZ) {
1971                         /*
1972                          * Better not allow unexpected channels when that could
1973                          * be going beyond the 1-11 range (e.g., discovering
1974                          * BSS on channel 12 when radio is configured for
1975                          * channel 11) or beyond the 6 GHz channel range.
1976                          */
1977                         return NULL;
1978                 }
1979
1980                 /* No match for the payload channel number - ignore it */
1981                 return channel;
1982         }
1983
1984         if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1985             scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1986                 /*
1987                  * Ignore channel number in 5 and 10 MHz channels where there
1988                  * may not be an n:1 or 1:n mapping between frequencies and
1989                  * channel numbers.
1990                  */
1991                 return channel;
1992         }
1993
1994         /*
1995          * Use the channel determined through the payload channel number
1996          * instead of the RX channel reported by the driver.
1997          */
1998         if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1999                 return NULL;
2000         return alt_channel;
2001 }
2002
2003 struct cfg80211_inform_single_bss_data {
2004         struct cfg80211_inform_bss *drv_data;
2005         enum cfg80211_bss_frame_type ftype;
2006         struct ieee80211_channel *channel;
2007         u8 bssid[ETH_ALEN];
2008         u64 tsf;
2009         u16 capability;
2010         u16 beacon_interval;
2011         const u8 *ie;
2012         size_t ielen;
2013
2014         enum {
2015                 BSS_SOURCE_DIRECT = 0,
2016                 BSS_SOURCE_MBSSID,
2017                 BSS_SOURCE_STA_PROFILE,
2018         } bss_source;
2019         /* Set if reporting bss_source != BSS_SOURCE_DIRECT */
2020         struct cfg80211_bss *source_bss;
2021         u8 max_bssid_indicator;
2022         u8 bssid_index;
2023 };
2024
2025 /* Returned bss is reference counted and must be cleaned up appropriately. */
2026 static struct cfg80211_bss *
2027 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
2028                                 struct cfg80211_inform_single_bss_data *data,
2029                                 gfp_t gfp)
2030 {
2031         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2032         struct cfg80211_inform_bss *drv_data = data->drv_data;
2033         struct cfg80211_bss_ies *ies;
2034         struct ieee80211_channel *channel;
2035         struct cfg80211_internal_bss tmp = {}, *res;
2036         int bss_type;
2037         bool signal_valid;
2038         unsigned long ts;
2039
2040         if (WARN_ON(!wiphy))
2041                 return NULL;
2042
2043         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
2044                     (drv_data->signal < 0 || drv_data->signal > 100)))
2045                 return NULL;
2046
2047         if (WARN_ON(data->bss_source != BSS_SOURCE_DIRECT && !data->source_bss))
2048                 return NULL;
2049
2050         channel = data->channel;
2051         if (!channel)
2052                 channel = cfg80211_get_bss_channel(wiphy, data->ie, data->ielen,
2053                                                    drv_data->chan,
2054                                                    drv_data->scan_width);
2055         if (!channel)
2056                 return NULL;
2057
2058         memcpy(tmp.pub.bssid, data->bssid, ETH_ALEN);
2059         tmp.pub.channel = channel;
2060         tmp.pub.scan_width = drv_data->scan_width;
2061         if (data->bss_source != BSS_SOURCE_STA_PROFILE)
2062                 tmp.pub.signal = drv_data->signal;
2063         else
2064                 tmp.pub.signal = 0;
2065         tmp.pub.beacon_interval = data->beacon_interval;
2066         tmp.pub.capability = data->capability;
2067         tmp.ts_boottime = drv_data->boottime_ns;
2068         tmp.parent_tsf = drv_data->parent_tsf;
2069         ether_addr_copy(tmp.parent_bssid, drv_data->parent_bssid);
2070
2071         if (data->bss_source != BSS_SOURCE_DIRECT) {
2072                 tmp.pub.transmitted_bss = data->source_bss;
2073                 ts = bss_from_pub(data->source_bss)->ts;
2074                 tmp.pub.bssid_index = data->bssid_index;
2075                 tmp.pub.max_bssid_indicator = data->max_bssid_indicator;
2076         } else {
2077                 ts = jiffies;
2078
2079                 if (channel->band == NL80211_BAND_60GHZ) {
2080                         bss_type = data->capability &
2081                                    WLAN_CAPABILITY_DMG_TYPE_MASK;
2082                         if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2083                             bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2084                                 regulatory_hint_found_beacon(wiphy, channel,
2085                                                              gfp);
2086                 } else {
2087                         if (data->capability & WLAN_CAPABILITY_ESS)
2088                                 regulatory_hint_found_beacon(wiphy, channel,
2089                                                              gfp);
2090                 }
2091         }
2092
2093         /*
2094          * If we do not know here whether the IEs are from a Beacon or Probe
2095          * Response frame, we need to pick one of the options and only use it
2096          * with the driver that does not provide the full Beacon/Probe Response
2097          * frame. Use Beacon frame pointer to avoid indicating that this should
2098          * override the IEs pointer should we have received an earlier
2099          * indication of Probe Response data.
2100          */
2101         ies = kzalloc(sizeof(*ies) + data->ielen, gfp);
2102         if (!ies)
2103                 return NULL;
2104         ies->len = data->ielen;
2105         ies->tsf = data->tsf;
2106         ies->from_beacon = false;
2107         memcpy(ies->data, data->ie, data->ielen);
2108
2109         switch (data->ftype) {
2110         case CFG80211_BSS_FTYPE_BEACON:
2111                 ies->from_beacon = true;
2112                 fallthrough;
2113         case CFG80211_BSS_FTYPE_UNKNOWN:
2114                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
2115                 break;
2116         case CFG80211_BSS_FTYPE_PRESP:
2117                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
2118                 break;
2119         }
2120         rcu_assign_pointer(tmp.pub.ies, ies);
2121
2122         signal_valid = drv_data->chan == channel;
2123         spin_lock_bh(&rdev->bss_lock);
2124         res = __cfg80211_bss_update(rdev, &tmp, signal_valid, ts);
2125         if (!res)
2126                 goto drop;
2127
2128         rdev_inform_bss(rdev, &res->pub, ies, data->drv_data);
2129
2130         if (data->bss_source == BSS_SOURCE_MBSSID) {
2131                 /* this is a nontransmitting bss, we need to add it to
2132                  * transmitting bss' list if it is not there
2133                  */
2134                 if (cfg80211_add_nontrans_list(data->source_bss, &res->pub)) {
2135                         if (__cfg80211_unlink_bss(rdev, res)) {
2136                                 rdev->bss_generation++;
2137                                 res = NULL;
2138                         }
2139                 }
2140
2141                 if (!res)
2142                         goto drop;
2143         }
2144         spin_unlock_bh(&rdev->bss_lock);
2145
2146         trace_cfg80211_return_bss(&res->pub);
2147         /* __cfg80211_bss_update gives us a referenced result */
2148         return &res->pub;
2149
2150 drop:
2151         spin_unlock_bh(&rdev->bss_lock);
2152         return NULL;
2153 }
2154
2155 static const struct element
2156 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
2157                                    const struct element *mbssid_elem,
2158                                    const struct element *sub_elem)
2159 {
2160         const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
2161         const struct element *next_mbssid;
2162         const struct element *next_sub;
2163
2164         next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
2165                                          mbssid_end,
2166                                          ielen - (mbssid_end - ie));
2167
2168         /*
2169          * If it is not the last subelement in current MBSSID IE or there isn't
2170          * a next MBSSID IE - profile is complete.
2171         */
2172         if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
2173             !next_mbssid)
2174                 return NULL;
2175
2176         /* For any length error, just return NULL */
2177
2178         if (next_mbssid->datalen < 4)
2179                 return NULL;
2180
2181         next_sub = (void *)&next_mbssid->data[1];
2182
2183         if (next_mbssid->data + next_mbssid->datalen <
2184             next_sub->data + next_sub->datalen)
2185                 return NULL;
2186
2187         if (next_sub->id != 0 || next_sub->datalen < 2)
2188                 return NULL;
2189
2190         /*
2191          * Check if the first element in the next sub element is a start
2192          * of a new profile
2193          */
2194         return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
2195                NULL : next_mbssid;
2196 }
2197
2198 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
2199                               const struct element *mbssid_elem,
2200                               const struct element *sub_elem,
2201                               u8 *merged_ie, size_t max_copy_len)
2202 {
2203         size_t copied_len = sub_elem->datalen;
2204         const struct element *next_mbssid;
2205
2206         if (sub_elem->datalen > max_copy_len)
2207                 return 0;
2208
2209         memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
2210
2211         while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
2212                                                                 mbssid_elem,
2213                                                                 sub_elem))) {
2214                 const struct element *next_sub = (void *)&next_mbssid->data[1];
2215
2216                 if (copied_len + next_sub->datalen > max_copy_len)
2217                         break;
2218                 memcpy(merged_ie + copied_len, next_sub->data,
2219                        next_sub->datalen);
2220                 copied_len += next_sub->datalen;
2221         }
2222
2223         return copied_len;
2224 }
2225 EXPORT_SYMBOL(cfg80211_merge_profile);
2226
2227 static void
2228 cfg80211_parse_mbssid_data(struct wiphy *wiphy,
2229                            struct cfg80211_inform_single_bss_data *tx_data,
2230                            struct cfg80211_bss *source_bss,
2231                            gfp_t gfp)
2232 {
2233         struct cfg80211_inform_single_bss_data data = {
2234                 .drv_data = tx_data->drv_data,
2235                 .ftype = tx_data->ftype,
2236                 .tsf = tx_data->tsf,
2237                 .beacon_interval = tx_data->beacon_interval,
2238                 .source_bss = source_bss,
2239                 .bss_source = BSS_SOURCE_MBSSID,
2240         };
2241         const u8 *mbssid_index_ie;
2242         const struct element *elem, *sub;
2243         u8 *new_ie, *profile;
2244         u64 seen_indices = 0;
2245         struct cfg80211_bss *bss;
2246
2247         if (!source_bss)
2248                 return;
2249         if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
2250                                 tx_data->ie, tx_data->ielen))
2251                 return;
2252         if (!wiphy->support_mbssid)
2253                 return;
2254         if (wiphy->support_only_he_mbssid &&
2255             !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY,
2256                                     tx_data->ie, tx_data->ielen))
2257                 return;
2258
2259         new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2260         if (!new_ie)
2261                 return;
2262
2263         profile = kmalloc(tx_data->ielen, gfp);
2264         if (!profile)
2265                 goto out;
2266
2267         for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID,
2268                             tx_data->ie, tx_data->ielen) {
2269                 if (elem->datalen < 4)
2270                         continue;
2271                 if (elem->data[0] < 1 || (int)elem->data[0] > 8)
2272                         continue;
2273                 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
2274                         u8 profile_len;
2275
2276                         if (sub->id != 0 || sub->datalen < 4) {
2277                                 /* not a valid BSS profile */
2278                                 continue;
2279                         }
2280
2281                         if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
2282                             sub->data[1] != 2) {
2283                                 /* The first element within the Nontransmitted
2284                                  * BSSID Profile is not the Nontransmitted
2285                                  * BSSID Capability element.
2286                                  */
2287                                 continue;
2288                         }
2289
2290                         memset(profile, 0, tx_data->ielen);
2291                         profile_len = cfg80211_merge_profile(tx_data->ie,
2292                                                              tx_data->ielen,
2293                                                              elem,
2294                                                              sub,
2295                                                              profile,
2296                                                              tx_data->ielen);
2297
2298                         /* found a Nontransmitted BSSID Profile */
2299                         mbssid_index_ie = cfg80211_find_ie
2300                                 (WLAN_EID_MULTI_BSSID_IDX,
2301                                  profile, profile_len);
2302                         if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
2303                             mbssid_index_ie[2] == 0 ||
2304                             mbssid_index_ie[2] > 46) {
2305                                 /* No valid Multiple BSSID-Index element */
2306                                 continue;
2307                         }
2308
2309                         if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
2310                                 /* We don't support legacy split of a profile */
2311                                 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2312                                                     mbssid_index_ie[2]);
2313
2314                         seen_indices |= BIT_ULL(mbssid_index_ie[2]);
2315
2316                         data.bssid_index = mbssid_index_ie[2];
2317                         data.max_bssid_indicator = elem->data[0];
2318
2319                         cfg80211_gen_new_bssid(tx_data->bssid,
2320                                                data.max_bssid_indicator,
2321                                                data.bssid_index,
2322                                                data.bssid);
2323
2324                         memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2325                         data.ie = new_ie;
2326                         data.ielen = cfg80211_gen_new_ie(tx_data->ie,
2327                                                          tx_data->ielen,
2328                                                          profile,
2329                                                          profile_len,
2330                                                          new_ie,
2331                                                          IEEE80211_MAX_DATA_LEN);
2332                         if (!data.ielen)
2333                                 continue;
2334
2335                         data.capability = get_unaligned_le16(profile + 2);
2336                         bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp);
2337                         if (!bss)
2338                                 break;
2339                         cfg80211_put_bss(wiphy, bss);
2340                 }
2341         }
2342
2343 out:
2344         kfree(new_ie);
2345         kfree(profile);
2346 }
2347
2348 ssize_t cfg80211_defragment_element(const struct element *elem, const u8 *ies,
2349                                     size_t ieslen, u8 *data, size_t data_len,
2350                                     u8 frag_id)
2351 {
2352         const struct element *next;
2353         ssize_t copied;
2354         u8 elem_datalen;
2355
2356         if (!elem)
2357                 return -EINVAL;
2358
2359         /* elem might be invalid after the memmove */
2360         next = (void *)(elem->data + elem->datalen);
2361
2362         elem_datalen = elem->datalen;
2363         if (elem->id == WLAN_EID_EXTENSION) {
2364                 copied = elem->datalen - 1;
2365                 if (copied > data_len)
2366                         return -ENOSPC;
2367
2368                 memmove(data, elem->data + 1, copied);
2369         } else {
2370                 copied = elem->datalen;
2371                 if (copied > data_len)
2372                         return -ENOSPC;
2373
2374                 memmove(data, elem->data, copied);
2375         }
2376
2377         /* Fragmented elements must have 255 bytes */
2378         if (elem_datalen < 255)
2379                 return copied;
2380
2381         for (elem = next;
2382              elem->data < ies + ieslen &&
2383                 elem->data + elem->datalen < ies + ieslen;
2384              elem = next) {
2385                 /* elem might be invalid after the memmove */
2386                 next = (void *)(elem->data + elem->datalen);
2387
2388                 if (elem->id != frag_id)
2389                         break;
2390
2391                 elem_datalen = elem->datalen;
2392
2393                 if (copied + elem_datalen > data_len)
2394                         return -ENOSPC;
2395
2396                 memmove(data + copied, elem->data, elem_datalen);
2397                 copied += elem_datalen;
2398
2399                 /* Only the last fragment may be short */
2400                 if (elem_datalen != 255)
2401                         break;
2402         }
2403
2404         return copied;
2405 }
2406 EXPORT_SYMBOL(cfg80211_defragment_element);
2407
2408 struct cfg80211_mle {
2409         struct ieee80211_multi_link_elem *mle;
2410         struct ieee80211_mle_per_sta_profile
2411                 *sta_prof[IEEE80211_MLD_MAX_NUM_LINKS];
2412         ssize_t sta_prof_len[IEEE80211_MLD_MAX_NUM_LINKS];
2413
2414         u8 data[];
2415 };
2416
2417 static struct cfg80211_mle *
2418 cfg80211_defrag_mle(const struct element *mle, const u8 *ie, size_t ielen,
2419                     gfp_t gfp)
2420 {
2421         const struct element *elem;
2422         struct cfg80211_mle *res;
2423         size_t buf_len;
2424         ssize_t mle_len;
2425         u8 common_size, idx;
2426
2427         if (!mle || !ieee80211_mle_size_ok(mle->data + 1, mle->datalen - 1))
2428                 return NULL;
2429
2430         /* Required length for first defragmentation */
2431         buf_len = mle->datalen - 1;
2432         for_each_element(elem, mle->data + mle->datalen,
2433                          ielen - sizeof(*mle) + mle->datalen) {
2434                 if (elem->id != WLAN_EID_FRAGMENT)
2435                         break;
2436
2437                 buf_len += elem->datalen;
2438         }
2439
2440         res = kzalloc(struct_size(res, data, buf_len), gfp);
2441         if (!res)
2442                 return NULL;
2443
2444         mle_len = cfg80211_defragment_element(mle, ie, ielen,
2445                                               res->data, buf_len,
2446                                               WLAN_EID_FRAGMENT);
2447         if (mle_len < 0)
2448                 goto error;
2449
2450         res->mle = (void *)res->data;
2451
2452         /* Find the sub-element area in the buffer */
2453         common_size = ieee80211_mle_common_size((u8 *)res->mle);
2454         ie = res->data + common_size;
2455         ielen = mle_len - common_size;
2456
2457         idx = 0;
2458         for_each_element_id(elem, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE,
2459                             ie, ielen) {
2460                 res->sta_prof[idx] = (void *)elem->data;
2461                 res->sta_prof_len[idx] = elem->datalen;
2462
2463                 idx++;
2464                 if (idx >= IEEE80211_MLD_MAX_NUM_LINKS)
2465                         break;
2466         }
2467         if (!for_each_element_completed(elem, ie, ielen))
2468                 goto error;
2469
2470         /* Defragment sta_info in-place */
2471         for (idx = 0; idx < IEEE80211_MLD_MAX_NUM_LINKS && res->sta_prof[idx];
2472              idx++) {
2473                 if (res->sta_prof_len[idx] < 255)
2474                         continue;
2475
2476                 elem = (void *)res->sta_prof[idx] - 2;
2477
2478                 if (idx + 1 < ARRAY_SIZE(res->sta_prof) &&
2479                     res->sta_prof[idx + 1])
2480                         buf_len = (u8 *)res->sta_prof[idx + 1] -
2481                                   (u8 *)res->sta_prof[idx];
2482                 else
2483                         buf_len = ielen + ie - (u8 *)elem;
2484
2485                 res->sta_prof_len[idx] =
2486                         cfg80211_defragment_element(elem,
2487                                                     (u8 *)elem, buf_len,
2488                                                     (u8 *)res->sta_prof[idx],
2489                                                     buf_len,
2490                                                     IEEE80211_MLE_SUBELEM_FRAGMENT);
2491                 if (res->sta_prof_len[idx] < 0)
2492                         goto error;
2493         }
2494
2495         return res;
2496
2497 error:
2498         kfree(res);
2499         return NULL;
2500 }
2501
2502 static bool
2503 cfg80211_tbtt_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id,
2504                               const struct ieee80211_neighbor_ap_info **ap_info,
2505                               const u8 **tbtt_info)
2506 {
2507         const struct ieee80211_neighbor_ap_info *info;
2508         const struct element *rnr;
2509         const u8 *pos, *end;
2510
2511         for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT, ie, ielen) {
2512                 pos = rnr->data;
2513                 end = rnr->data + rnr->datalen;
2514
2515                 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
2516                 while (sizeof(*info) <= end - pos) {
2517                         const struct ieee80211_rnr_mld_params *mld_params;
2518                         u16 params;
2519                         u8 length, i, count, mld_params_offset;
2520                         u8 type, lid;
2521
2522                         info = (void *)pos;
2523                         count = u8_get_bits(info->tbtt_info_hdr,
2524                                             IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
2525                         length = info->tbtt_info_len;
2526
2527                         pos += sizeof(*info);
2528
2529                         if (count * length > end - pos)
2530                                 return false;
2531
2532                         type = u8_get_bits(info->tbtt_info_hdr,
2533                                            IEEE80211_AP_INFO_TBTT_HDR_TYPE);
2534
2535                         /* Only accept full TBTT information. NSTR mobile APs
2536                          * use the shortened version, but we ignore them here.
2537                          */
2538                         if (type == IEEE80211_TBTT_INFO_TYPE_TBTT &&
2539                             length >=
2540                             offsetofend(struct ieee80211_tbtt_info_ge_11,
2541                                         mld_params)) {
2542                                 mld_params_offset =
2543                                         offsetof(struct ieee80211_tbtt_info_ge_11, mld_params);
2544                         } else {
2545                                 pos += count * length;
2546                                 continue;
2547                         }
2548
2549                         for (i = 0; i < count; i++) {
2550                                 mld_params = (void *)pos + mld_params_offset;
2551                                 params = le16_to_cpu(mld_params->params);
2552
2553                                 lid = u16_get_bits(params,
2554                                                    IEEE80211_RNR_MLD_PARAMS_LINK_ID);
2555
2556                                 if (mld_id == mld_params->mld_id &&
2557                                     link_id == lid) {
2558                                         *ap_info = info;
2559                                         *tbtt_info = pos;
2560
2561                                         return true;
2562                                 }
2563
2564                                 pos += length;
2565                         }
2566                 }
2567         }
2568
2569         return false;
2570 }
2571
2572 static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy,
2573                                        struct cfg80211_inform_single_bss_data *tx_data,
2574                                        struct cfg80211_bss *source_bss,
2575                                        gfp_t gfp)
2576 {
2577         struct cfg80211_inform_single_bss_data data = {
2578                 .drv_data = tx_data->drv_data,
2579                 .ftype = tx_data->ftype,
2580                 .source_bss = source_bss,
2581                 .bss_source = BSS_SOURCE_STA_PROFILE,
2582         };
2583         struct ieee80211_multi_link_elem *ml_elem;
2584         const struct element *elem;
2585         struct cfg80211_mle *mle;
2586         u16 control;
2587         u8 *new_ie;
2588         struct cfg80211_bss *bss;
2589         int mld_id;
2590         u16 seen_links = 0;
2591         const u8 *pos;
2592         u8 i;
2593
2594         if (!source_bss)
2595                 return;
2596
2597         if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP)
2598                 return;
2599
2600         elem = cfg80211_find_ext_elem(WLAN_EID_EXT_EHT_MULTI_LINK,
2601                                       tx_data->ie, tx_data->ielen);
2602         if (!elem || !ieee80211_mle_size_ok(elem->data + 1, elem->datalen - 1))
2603                 return;
2604
2605         ml_elem = (void *)elem->data + 1;
2606         control = le16_to_cpu(ml_elem->control);
2607         if (u16_get_bits(control, IEEE80211_ML_CONTROL_TYPE) !=
2608             IEEE80211_ML_CONTROL_TYPE_BASIC)
2609                 return;
2610
2611         /* Must be present when transmitted by an AP (in a probe response) */
2612         if (!(control & IEEE80211_MLC_BASIC_PRES_BSS_PARAM_CH_CNT) ||
2613             !(control & IEEE80211_MLC_BASIC_PRES_LINK_ID) ||
2614             !(control & IEEE80211_MLC_BASIC_PRES_MLD_CAPA_OP))
2615                 return;
2616
2617         /* length + MLD MAC address + link ID info + BSS Params Change Count */
2618         pos = ml_elem->variable + 1 + 6 + 1 + 1;
2619
2620         if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_MED_SYNC_DELAY))
2621                 pos += 2;
2622         if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_EML_CAPA))
2623                 pos += 2;
2624
2625         /* MLD capabilities and operations */
2626         pos += 2;
2627
2628         /* Not included when the (nontransmitted) AP is responding itself,
2629          * but defined to zero then (Draft P802.11be_D3.0, 9.4.2.170.2)
2630          */
2631         if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_MLD_ID)) {
2632                 mld_id = *pos;
2633                 pos += 1;
2634         } else {
2635                 mld_id = 0;
2636         }
2637
2638         /* Extended MLD capabilities and operations */
2639         pos += 2;
2640
2641         /* Fully defrag the ML element for sta information/profile iteration */
2642         mle = cfg80211_defrag_mle(elem, tx_data->ie, tx_data->ielen, gfp);
2643         if (!mle)
2644                 return;
2645
2646         new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2647         if (!new_ie)
2648                 goto out;
2649
2650         for (i = 0; i < ARRAY_SIZE(mle->sta_prof) && mle->sta_prof[i]; i++) {
2651                 const struct ieee80211_neighbor_ap_info *ap_info;
2652                 enum nl80211_band band;
2653                 u32 freq;
2654                 const u8 *profile;
2655                 const u8 *tbtt_info;
2656                 ssize_t profile_len;
2657                 u8 link_id;
2658
2659                 if (!ieee80211_mle_basic_sta_prof_size_ok((u8 *)mle->sta_prof[i],
2660                                                           mle->sta_prof_len[i]))
2661                         continue;
2662
2663                 control = le16_to_cpu(mle->sta_prof[i]->control);
2664
2665                 if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE))
2666                         continue;
2667
2668                 link_id = u16_get_bits(control,
2669                                        IEEE80211_MLE_STA_CONTROL_LINK_ID);
2670                 if (seen_links & BIT(link_id))
2671                         break;
2672                 seen_links |= BIT(link_id);
2673
2674                 if (!(control & IEEE80211_MLE_STA_CONTROL_BEACON_INT_PRESENT) ||
2675                     !(control & IEEE80211_MLE_STA_CONTROL_TSF_OFFS_PRESENT) ||
2676                     !(control & IEEE80211_MLE_STA_CONTROL_STA_MAC_ADDR_PRESENT))
2677                         continue;
2678
2679                 memcpy(data.bssid, mle->sta_prof[i]->variable, ETH_ALEN);
2680                 data.beacon_interval =
2681                         get_unaligned_le16(mle->sta_prof[i]->variable + 6);
2682                 data.tsf = tx_data->tsf +
2683                            get_unaligned_le64(mle->sta_prof[i]->variable + 8);
2684
2685                 /* sta_info_len counts itself */
2686                 profile = mle->sta_prof[i]->variable +
2687                           mle->sta_prof[i]->sta_info_len - 1;
2688                 profile_len = (u8 *)mle->sta_prof[i] + mle->sta_prof_len[i] -
2689                               profile;
2690
2691                 if (profile_len < 2)
2692                         continue;
2693
2694                 data.capability = get_unaligned_le16(profile);
2695                 profile += 2;
2696                 profile_len -= 2;
2697
2698                 /* Find in RNR to look up channel information */
2699                 if (!cfg80211_tbtt_info_for_mld_ap(tx_data->ie, tx_data->ielen,
2700                                                    mld_id, link_id,
2701                                                    &ap_info, &tbtt_info))
2702                         continue;
2703
2704                 /* We could sanity check the BSSID is included */
2705
2706                 if (!ieee80211_operating_class_to_band(ap_info->op_class,
2707                                                        &band))
2708                         continue;
2709
2710                 freq = ieee80211_channel_to_freq_khz(ap_info->channel, band);
2711                 data.channel = ieee80211_get_channel_khz(wiphy, freq);
2712
2713                 /* Generate new elements */
2714                 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2715                 data.ie = new_ie;
2716                 data.ielen = cfg80211_gen_new_ie(tx_data->ie, tx_data->ielen,
2717                                                  profile, profile_len,
2718                                                  new_ie,
2719                                                  IEEE80211_MAX_DATA_LEN);
2720                 if (!data.ielen)
2721                         continue;
2722
2723                 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp);
2724                 if (!bss)
2725                         break;
2726                 cfg80211_put_bss(wiphy, bss);
2727         }
2728
2729 out:
2730         kfree(new_ie);
2731         kfree(mle);
2732 }
2733
2734 struct cfg80211_bss *
2735 cfg80211_inform_bss_data(struct wiphy *wiphy,
2736                          struct cfg80211_inform_bss *data,
2737                          enum cfg80211_bss_frame_type ftype,
2738                          const u8 *bssid, u64 tsf, u16 capability,
2739                          u16 beacon_interval, const u8 *ie, size_t ielen,
2740                          gfp_t gfp)
2741 {
2742         struct cfg80211_inform_single_bss_data inform_data = {
2743                 .drv_data = data,
2744                 .ftype = ftype,
2745                 .tsf = tsf,
2746                 .capability = capability,
2747                 .beacon_interval = beacon_interval,
2748                 .ie = ie,
2749                 .ielen = ielen,
2750         };
2751         struct cfg80211_bss *res;
2752
2753         memcpy(inform_data.bssid, bssid, ETH_ALEN);
2754
2755         res = cfg80211_inform_single_bss_data(wiphy, &inform_data, gfp);
2756         if (!res)
2757                 return NULL;
2758
2759         cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp);
2760
2761         cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp);
2762
2763         return res;
2764 }
2765 EXPORT_SYMBOL(cfg80211_inform_bss_data);
2766
2767 /* cfg80211_inform_bss_width_frame helper */
2768 static struct cfg80211_bss *
2769 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
2770                                       struct cfg80211_inform_bss *data,
2771                                       struct ieee80211_mgmt *mgmt, size_t len,
2772                                       gfp_t gfp)
2773 {
2774         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2775         struct cfg80211_internal_bss tmp = {}, *res;
2776         struct cfg80211_bss_ies *ies;
2777         struct ieee80211_channel *channel;
2778         bool signal_valid;
2779         struct ieee80211_ext *ext = NULL;
2780         u8 *bssid, *variable;
2781         u16 capability, beacon_int;
2782         size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
2783                                              u.probe_resp.variable);
2784         int bss_type;
2785
2786         BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
2787                         offsetof(struct ieee80211_mgmt, u.beacon.variable));
2788
2789         trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
2790
2791         if (WARN_ON(!mgmt))
2792                 return NULL;
2793
2794         if (WARN_ON(!wiphy))
2795                 return NULL;
2796
2797         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
2798                     (data->signal < 0 || data->signal > 100)))
2799                 return NULL;
2800
2801         if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
2802                 ext = (void *) mgmt;
2803                 min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
2804                 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2805                         min_hdr_len = offsetof(struct ieee80211_ext,
2806                                                u.s1g_short_beacon.variable);
2807         }
2808
2809         if (WARN_ON(len < min_hdr_len))
2810                 return NULL;
2811
2812         ielen = len - min_hdr_len;
2813         variable = mgmt->u.probe_resp.variable;
2814         if (ext) {
2815                 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2816                         variable = ext->u.s1g_short_beacon.variable;
2817                 else
2818                         variable = ext->u.s1g_beacon.variable;
2819         }
2820
2821         channel = cfg80211_get_bss_channel(wiphy, variable,
2822                                            ielen, data->chan, data->scan_width);
2823         if (!channel)
2824                 return NULL;
2825
2826         if (ext) {
2827                 const struct ieee80211_s1g_bcn_compat_ie *compat;
2828                 const struct element *elem;
2829
2830                 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
2831                                           variable, ielen);
2832                 if (!elem)
2833                         return NULL;
2834                 if (elem->datalen < sizeof(*compat))
2835                         return NULL;
2836                 compat = (void *)elem->data;
2837                 bssid = ext->u.s1g_beacon.sa;
2838                 capability = le16_to_cpu(compat->compat_info);
2839                 beacon_int = le16_to_cpu(compat->beacon_int);
2840         } else {
2841                 bssid = mgmt->bssid;
2842                 beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
2843                 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
2844         }
2845
2846         if (channel->band == NL80211_BAND_60GHZ) {
2847                 bss_type = capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
2848                 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2849                     bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2850                         regulatory_hint_found_beacon(wiphy, channel, gfp);
2851         } else {
2852                 if (capability & WLAN_CAPABILITY_ESS)
2853                         regulatory_hint_found_beacon(wiphy, channel, gfp);
2854         }
2855
2856         ies = kzalloc(sizeof(*ies) + ielen, gfp);
2857         if (!ies)
2858                 return NULL;
2859         ies->len = ielen;
2860         ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2861         ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
2862                            ieee80211_is_s1g_beacon(mgmt->frame_control);
2863         memcpy(ies->data, variable, ielen);
2864
2865         if (ieee80211_is_probe_resp(mgmt->frame_control))
2866                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
2867         else
2868                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
2869         rcu_assign_pointer(tmp.pub.ies, ies);
2870
2871         memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
2872         tmp.pub.beacon_interval = beacon_int;
2873         tmp.pub.capability = capability;
2874         tmp.pub.channel = channel;
2875         tmp.pub.scan_width = data->scan_width;
2876         tmp.pub.signal = data->signal;
2877         tmp.ts_boottime = data->boottime_ns;
2878         tmp.parent_tsf = data->parent_tsf;
2879         tmp.pub.chains = data->chains;
2880         memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
2881         ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
2882
2883         signal_valid = data->chan == channel;
2884         spin_lock_bh(&rdev->bss_lock);
2885         res = __cfg80211_bss_update(rdev, &tmp, signal_valid, jiffies);
2886         if (!res)
2887                 goto drop;
2888
2889         rdev_inform_bss(rdev, &res->pub, ies, data->drv_data);
2890
2891         spin_unlock_bh(&rdev->bss_lock);
2892
2893         trace_cfg80211_return_bss(&res->pub);
2894         /* __cfg80211_bss_update gives us a referenced result */
2895         return &res->pub;
2896
2897 drop:
2898         spin_unlock_bh(&rdev->bss_lock);
2899         return NULL;
2900 }
2901
2902 struct cfg80211_bss *
2903 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
2904                                struct cfg80211_inform_bss *data,
2905                                struct ieee80211_mgmt *mgmt, size_t len,
2906                                gfp_t gfp)
2907 {
2908         struct cfg80211_inform_single_bss_data inform_data = {
2909                 .drv_data = data,
2910                 .ie = mgmt->u.probe_resp.variable,
2911                 .ielen = len - offsetof(struct ieee80211_mgmt,
2912                                         u.probe_resp.variable),
2913         };
2914         struct cfg80211_bss *res;
2915
2916         res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
2917                                                     len, gfp);
2918         if (!res)
2919                 return NULL;
2920
2921         /* don't do any further MBSSID/ML handling for S1G */
2922         if (ieee80211_is_s1g_beacon(mgmt->frame_control))
2923                 return res;
2924
2925         inform_data.ftype = ieee80211_is_beacon(mgmt->frame_control) ?
2926                 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
2927         memcpy(inform_data.bssid, mgmt->bssid, ETH_ALEN);
2928         inform_data.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2929         inform_data.beacon_interval =
2930                 le16_to_cpu(mgmt->u.probe_resp.beacon_int);
2931
2932         /* process each non-transmitting bss */
2933         cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp);
2934
2935         cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp);
2936
2937         return res;
2938 }
2939 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
2940
2941 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2942 {
2943         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2944
2945         if (!pub)
2946                 return;
2947
2948         spin_lock_bh(&rdev->bss_lock);
2949         bss_ref_get(rdev, bss_from_pub(pub));
2950         spin_unlock_bh(&rdev->bss_lock);
2951 }
2952 EXPORT_SYMBOL(cfg80211_ref_bss);
2953
2954 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2955 {
2956         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2957
2958         if (!pub)
2959                 return;
2960
2961         spin_lock_bh(&rdev->bss_lock);
2962         bss_ref_put(rdev, bss_from_pub(pub));
2963         spin_unlock_bh(&rdev->bss_lock);
2964 }
2965 EXPORT_SYMBOL(cfg80211_put_bss);
2966
2967 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2968 {
2969         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2970         struct cfg80211_internal_bss *bss, *tmp1;
2971         struct cfg80211_bss *nontrans_bss, *tmp;
2972
2973         if (WARN_ON(!pub))
2974                 return;
2975
2976         bss = bss_from_pub(pub);
2977
2978         spin_lock_bh(&rdev->bss_lock);
2979         if (list_empty(&bss->list))
2980                 goto out;
2981
2982         list_for_each_entry_safe(nontrans_bss, tmp,
2983                                  &pub->nontrans_list,
2984                                  nontrans_list) {
2985                 tmp1 = bss_from_pub(nontrans_bss);
2986                 if (__cfg80211_unlink_bss(rdev, tmp1))
2987                         rdev->bss_generation++;
2988         }
2989
2990         if (__cfg80211_unlink_bss(rdev, bss))
2991                 rdev->bss_generation++;
2992 out:
2993         spin_unlock_bh(&rdev->bss_lock);
2994 }
2995 EXPORT_SYMBOL(cfg80211_unlink_bss);
2996
2997 void cfg80211_bss_iter(struct wiphy *wiphy,
2998                        struct cfg80211_chan_def *chandef,
2999                        void (*iter)(struct wiphy *wiphy,
3000                                     struct cfg80211_bss *bss,
3001                                     void *data),
3002                        void *iter_data)
3003 {
3004         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3005         struct cfg80211_internal_bss *bss;
3006
3007         spin_lock_bh(&rdev->bss_lock);
3008
3009         list_for_each_entry(bss, &rdev->bss_list, list) {
3010                 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel,
3011                                                      false))
3012                         iter(wiphy, &bss->pub, iter_data);
3013         }
3014
3015         spin_unlock_bh(&rdev->bss_lock);
3016 }
3017 EXPORT_SYMBOL(cfg80211_bss_iter);
3018
3019 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
3020                                      unsigned int link_id,
3021                                      struct ieee80211_channel *chan)
3022 {
3023         struct wiphy *wiphy = wdev->wiphy;
3024         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3025         struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss;
3026         struct cfg80211_internal_bss *new = NULL;
3027         struct cfg80211_internal_bss *bss;
3028         struct cfg80211_bss *nontrans_bss;
3029         struct cfg80211_bss *tmp;
3030
3031         spin_lock_bh(&rdev->bss_lock);
3032
3033         /*
3034          * Some APs use CSA also for bandwidth changes, i.e., without actually
3035          * changing the control channel, so no need to update in such a case.
3036          */
3037         if (cbss->pub.channel == chan)
3038                 goto done;
3039
3040         /* use transmitting bss */
3041         if (cbss->pub.transmitted_bss)
3042                 cbss = bss_from_pub(cbss->pub.transmitted_bss);
3043
3044         cbss->pub.channel = chan;
3045
3046         list_for_each_entry(bss, &rdev->bss_list, list) {
3047                 if (!cfg80211_bss_type_match(bss->pub.capability,
3048                                              bss->pub.channel->band,
3049                                              wdev->conn_bss_type))
3050                         continue;
3051
3052                 if (bss == cbss)
3053                         continue;
3054
3055                 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
3056                         new = bss;
3057                         break;
3058                 }
3059         }
3060
3061         if (new) {
3062                 /* to save time, update IEs for transmitting bss only */
3063                 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
3064                         new->pub.proberesp_ies = NULL;
3065                         new->pub.beacon_ies = NULL;
3066                 }
3067
3068                 list_for_each_entry_safe(nontrans_bss, tmp,
3069                                          &new->pub.nontrans_list,
3070                                          nontrans_list) {
3071                         bss = bss_from_pub(nontrans_bss);
3072                         if (__cfg80211_unlink_bss(rdev, bss))
3073                                 rdev->bss_generation++;
3074                 }
3075
3076                 WARN_ON(atomic_read(&new->hold));
3077                 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
3078                         rdev->bss_generation++;
3079         }
3080
3081         rb_erase(&cbss->rbn, &rdev->bss_tree);
3082         rb_insert_bss(rdev, cbss);
3083         rdev->bss_generation++;
3084
3085         list_for_each_entry_safe(nontrans_bss, tmp,
3086                                  &cbss->pub.nontrans_list,
3087                                  nontrans_list) {
3088                 bss = bss_from_pub(nontrans_bss);
3089                 bss->pub.channel = chan;
3090                 rb_erase(&bss->rbn, &rdev->bss_tree);
3091                 rb_insert_bss(rdev, bss);
3092                 rdev->bss_generation++;
3093         }
3094
3095 done:
3096         spin_unlock_bh(&rdev->bss_lock);
3097 }
3098
3099 #ifdef CONFIG_CFG80211_WEXT
3100 static struct cfg80211_registered_device *
3101 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
3102 {
3103         struct cfg80211_registered_device *rdev;
3104         struct net_device *dev;
3105
3106         ASSERT_RTNL();
3107
3108         dev = dev_get_by_index(net, ifindex);
3109         if (!dev)
3110                 return ERR_PTR(-ENODEV);
3111         if (dev->ieee80211_ptr)
3112                 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
3113         else
3114                 rdev = ERR_PTR(-ENODEV);
3115         dev_put(dev);
3116         return rdev;
3117 }
3118
3119 int cfg80211_wext_siwscan(struct net_device *dev,
3120                           struct iw_request_info *info,
3121                           union iwreq_data *wrqu, char *extra)
3122 {
3123         struct cfg80211_registered_device *rdev;
3124         struct wiphy *wiphy;
3125         struct iw_scan_req *wreq = NULL;
3126         struct cfg80211_scan_request *creq;
3127         int i, err, n_channels = 0;
3128         enum nl80211_band band;
3129
3130         if (!netif_running(dev))
3131                 return -ENETDOWN;
3132
3133         if (wrqu->data.length == sizeof(struct iw_scan_req))
3134                 wreq = (struct iw_scan_req *)extra;
3135
3136         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3137
3138         if (IS_ERR(rdev))
3139                 return PTR_ERR(rdev);
3140
3141         if (rdev->scan_req || rdev->scan_msg)
3142                 return -EBUSY;
3143
3144         wiphy = &rdev->wiphy;
3145
3146         /* Determine number of channels, needed to allocate creq */
3147         if (wreq && wreq->num_channels)
3148                 n_channels = wreq->num_channels;
3149         else
3150                 n_channels = ieee80211_get_num_supported_channels(wiphy);
3151
3152         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
3153                        n_channels * sizeof(void *),
3154                        GFP_ATOMIC);
3155         if (!creq)
3156                 return -ENOMEM;
3157
3158         creq->wiphy = wiphy;
3159         creq->wdev = dev->ieee80211_ptr;
3160         /* SSIDs come after channels */
3161         creq->ssids = (void *)&creq->channels[n_channels];
3162         creq->n_channels = n_channels;
3163         creq->n_ssids = 1;
3164         creq->scan_start = jiffies;
3165
3166         /* translate "Scan on frequencies" request */
3167         i = 0;
3168         for (band = 0; band < NUM_NL80211_BANDS; band++) {
3169                 int j;
3170
3171                 if (!wiphy->bands[band])
3172                         continue;
3173
3174                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
3175                         /* ignore disabled channels */
3176                         if (wiphy->bands[band]->channels[j].flags &
3177                                                 IEEE80211_CHAN_DISABLED)
3178                                 continue;
3179
3180                         /* If we have a wireless request structure and the
3181                          * wireless request specifies frequencies, then search
3182                          * for the matching hardware channel.
3183                          */
3184                         if (wreq && wreq->num_channels) {
3185                                 int k;
3186                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
3187                                 for (k = 0; k < wreq->num_channels; k++) {
3188                                         struct iw_freq *freq =
3189                                                 &wreq->channel_list[k];
3190                                         int wext_freq =
3191                                                 cfg80211_wext_freq(freq);
3192
3193                                         if (wext_freq == wiphy_freq)
3194                                                 goto wext_freq_found;
3195                                 }
3196                                 goto wext_freq_not_found;
3197                         }
3198
3199                 wext_freq_found:
3200                         creq->channels[i] = &wiphy->bands[band]->channels[j];
3201                         i++;
3202                 wext_freq_not_found: ;
3203                 }
3204         }
3205         /* No channels found? */
3206         if (!i) {
3207                 err = -EINVAL;
3208                 goto out;
3209         }
3210
3211         /* Set real number of channels specified in creq->channels[] */
3212         creq->n_channels = i;
3213
3214         /* translate "Scan for SSID" request */
3215         if (wreq) {
3216                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
3217                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
3218                                 err = -EINVAL;
3219                                 goto out;
3220                         }
3221                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
3222                         creq->ssids[0].ssid_len = wreq->essid_len;
3223                 }
3224                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
3225                         creq->n_ssids = 0;
3226         }
3227
3228         for (i = 0; i < NUM_NL80211_BANDS; i++)
3229                 if (wiphy->bands[i])
3230                         creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
3231
3232         eth_broadcast_addr(creq->bssid);
3233
3234         wiphy_lock(&rdev->wiphy);
3235
3236         rdev->scan_req = creq;
3237         err = rdev_scan(rdev, creq);
3238         if (err) {
3239                 rdev->scan_req = NULL;
3240                 /* creq will be freed below */
3241         } else {
3242                 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
3243                 /* creq now owned by driver */
3244                 creq = NULL;
3245                 dev_hold(dev);
3246         }
3247         wiphy_unlock(&rdev->wiphy);
3248  out:
3249         kfree(creq);
3250         return err;
3251 }
3252 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
3253
3254 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
3255                                     const struct cfg80211_bss_ies *ies,
3256                                     char *current_ev, char *end_buf)
3257 {
3258         const u8 *pos, *end, *next;
3259         struct iw_event iwe;
3260
3261         if (!ies)
3262                 return current_ev;
3263
3264         /*
3265          * If needed, fragment the IEs buffer (at IE boundaries) into short
3266          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
3267          */
3268         pos = ies->data;
3269         end = pos + ies->len;
3270
3271         while (end - pos > IW_GENERIC_IE_MAX) {
3272                 next = pos + 2 + pos[1];
3273                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
3274                         next = next + 2 + next[1];
3275
3276                 memset(&iwe, 0, sizeof(iwe));
3277                 iwe.cmd = IWEVGENIE;
3278                 iwe.u.data.length = next - pos;
3279                 current_ev = iwe_stream_add_point_check(info, current_ev,
3280                                                         end_buf, &iwe,
3281                                                         (void *)pos);
3282                 if (IS_ERR(current_ev))
3283                         return current_ev;
3284                 pos = next;
3285         }
3286
3287         if (end > pos) {
3288                 memset(&iwe, 0, sizeof(iwe));
3289                 iwe.cmd = IWEVGENIE;
3290                 iwe.u.data.length = end - pos;
3291                 current_ev = iwe_stream_add_point_check(info, current_ev,
3292                                                         end_buf, &iwe,
3293                                                         (void *)pos);
3294                 if (IS_ERR(current_ev))
3295                         return current_ev;
3296         }
3297
3298         return current_ev;
3299 }
3300
3301 static char *
3302 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
3303               struct cfg80211_internal_bss *bss, char *current_ev,
3304               char *end_buf)
3305 {
3306         const struct cfg80211_bss_ies *ies;
3307         struct iw_event iwe;
3308         const u8 *ie;
3309         u8 buf[50];
3310         u8 *cfg, *p, *tmp;
3311         int rem, i, sig;
3312         bool ismesh = false;
3313
3314         memset(&iwe, 0, sizeof(iwe));
3315         iwe.cmd = SIOCGIWAP;
3316         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
3317         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
3318         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3319                                                 IW_EV_ADDR_LEN);
3320         if (IS_ERR(current_ev))
3321                 return current_ev;
3322
3323         memset(&iwe, 0, sizeof(iwe));
3324         iwe.cmd = SIOCGIWFREQ;
3325         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
3326         iwe.u.freq.e = 0;
3327         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3328                                                 IW_EV_FREQ_LEN);
3329         if (IS_ERR(current_ev))
3330                 return current_ev;
3331
3332         memset(&iwe, 0, sizeof(iwe));
3333         iwe.cmd = SIOCGIWFREQ;
3334         iwe.u.freq.m = bss->pub.channel->center_freq;
3335         iwe.u.freq.e = 6;
3336         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3337                                                 IW_EV_FREQ_LEN);
3338         if (IS_ERR(current_ev))
3339                 return current_ev;
3340
3341         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
3342                 memset(&iwe, 0, sizeof(iwe));
3343                 iwe.cmd = IWEVQUAL;
3344                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
3345                                      IW_QUAL_NOISE_INVALID |
3346                                      IW_QUAL_QUAL_UPDATED;
3347                 switch (wiphy->signal_type) {
3348                 case CFG80211_SIGNAL_TYPE_MBM:
3349                         sig = bss->pub.signal / 100;
3350                         iwe.u.qual.level = sig;
3351                         iwe.u.qual.updated |= IW_QUAL_DBM;
3352                         if (sig < -110)         /* rather bad */
3353                                 sig = -110;
3354                         else if (sig > -40)     /* perfect */
3355                                 sig = -40;
3356                         /* will give a range of 0 .. 70 */
3357                         iwe.u.qual.qual = sig + 110;
3358                         break;
3359                 case CFG80211_SIGNAL_TYPE_UNSPEC:
3360                         iwe.u.qual.level = bss->pub.signal;
3361                         /* will give range 0 .. 100 */
3362                         iwe.u.qual.qual = bss->pub.signal;
3363                         break;
3364                 default:
3365                         /* not reached */
3366                         break;
3367                 }
3368                 current_ev = iwe_stream_add_event_check(info, current_ev,
3369                                                         end_buf, &iwe,
3370                                                         IW_EV_QUAL_LEN);
3371                 if (IS_ERR(current_ev))
3372                         return current_ev;
3373         }
3374
3375         memset(&iwe, 0, sizeof(iwe));
3376         iwe.cmd = SIOCGIWENCODE;
3377         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
3378                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
3379         else
3380                 iwe.u.data.flags = IW_ENCODE_DISABLED;
3381         iwe.u.data.length = 0;
3382         current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3383                                                 &iwe, "");
3384         if (IS_ERR(current_ev))
3385                 return current_ev;
3386
3387         rcu_read_lock();
3388         ies = rcu_dereference(bss->pub.ies);
3389         rem = ies->len;
3390         ie = ies->data;
3391
3392         while (rem >= 2) {
3393                 /* invalid data */
3394                 if (ie[1] > rem - 2)
3395                         break;
3396
3397                 switch (ie[0]) {
3398                 case WLAN_EID_SSID:
3399                         memset(&iwe, 0, sizeof(iwe));
3400                         iwe.cmd = SIOCGIWESSID;
3401                         iwe.u.data.length = ie[1];
3402                         iwe.u.data.flags = 1;
3403                         current_ev = iwe_stream_add_point_check(info,
3404                                                                 current_ev,
3405                                                                 end_buf, &iwe,
3406                                                                 (u8 *)ie + 2);
3407                         if (IS_ERR(current_ev))
3408                                 goto unlock;
3409                         break;
3410                 case WLAN_EID_MESH_ID:
3411                         memset(&iwe, 0, sizeof(iwe));
3412                         iwe.cmd = SIOCGIWESSID;
3413                         iwe.u.data.length = ie[1];
3414                         iwe.u.data.flags = 1;
3415                         current_ev = iwe_stream_add_point_check(info,
3416                                                                 current_ev,
3417                                                                 end_buf, &iwe,
3418                                                                 (u8 *)ie + 2);
3419                         if (IS_ERR(current_ev))
3420                                 goto unlock;
3421                         break;
3422                 case WLAN_EID_MESH_CONFIG:
3423                         ismesh = true;
3424                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
3425                                 break;
3426                         cfg = (u8 *)ie + 2;
3427                         memset(&iwe, 0, sizeof(iwe));
3428                         iwe.cmd = IWEVCUSTOM;
3429                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
3430                                 "0x%02X", cfg[0]);
3431                         iwe.u.data.length = strlen(buf);
3432                         current_ev = iwe_stream_add_point_check(info,
3433                                                                 current_ev,
3434                                                                 end_buf,
3435                                                                 &iwe, buf);
3436                         if (IS_ERR(current_ev))
3437                                 goto unlock;
3438                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
3439                                 cfg[1]);
3440                         iwe.u.data.length = strlen(buf);
3441                         current_ev = iwe_stream_add_point_check(info,
3442                                                                 current_ev,
3443                                                                 end_buf,
3444                                                                 &iwe, buf);
3445                         if (IS_ERR(current_ev))
3446                                 goto unlock;
3447                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
3448                                 cfg[2]);
3449                         iwe.u.data.length = strlen(buf);
3450                         current_ev = iwe_stream_add_point_check(info,
3451                                                                 current_ev,
3452                                                                 end_buf,
3453                                                                 &iwe, buf);
3454                         if (IS_ERR(current_ev))
3455                                 goto unlock;
3456                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
3457                         iwe.u.data.length = strlen(buf);
3458                         current_ev = iwe_stream_add_point_check(info,
3459                                                                 current_ev,
3460                                                                 end_buf,
3461                                                                 &iwe, buf);
3462                         if (IS_ERR(current_ev))
3463                                 goto unlock;
3464                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
3465                         iwe.u.data.length = strlen(buf);
3466                         current_ev = iwe_stream_add_point_check(info,
3467                                                                 current_ev,
3468                                                                 end_buf,
3469                                                                 &iwe, buf);
3470                         if (IS_ERR(current_ev))
3471                                 goto unlock;
3472                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
3473                         iwe.u.data.length = strlen(buf);
3474                         current_ev = iwe_stream_add_point_check(info,
3475                                                                 current_ev,
3476                                                                 end_buf,
3477                                                                 &iwe, buf);
3478                         if (IS_ERR(current_ev))
3479                                 goto unlock;
3480                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
3481                         iwe.u.data.length = strlen(buf);
3482                         current_ev = iwe_stream_add_point_check(info,
3483                                                                 current_ev,
3484                                                                 end_buf,
3485                                                                 &iwe, buf);
3486                         if (IS_ERR(current_ev))
3487                                 goto unlock;
3488                         break;
3489                 case WLAN_EID_SUPP_RATES:
3490                 case WLAN_EID_EXT_SUPP_RATES:
3491                         /* display all supported rates in readable format */
3492                         p = current_ev + iwe_stream_lcp_len(info);
3493
3494                         memset(&iwe, 0, sizeof(iwe));
3495                         iwe.cmd = SIOCGIWRATE;
3496                         /* Those two flags are ignored... */
3497                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3498
3499                         for (i = 0; i < ie[1]; i++) {
3500                                 iwe.u.bitrate.value =
3501                                         ((ie[i + 2] & 0x7f) * 500000);
3502                                 tmp = p;
3503                                 p = iwe_stream_add_value(info, current_ev, p,
3504                                                          end_buf, &iwe,
3505                                                          IW_EV_PARAM_LEN);
3506                                 if (p == tmp) {
3507                                         current_ev = ERR_PTR(-E2BIG);
3508                                         goto unlock;
3509                                 }
3510                         }
3511                         current_ev = p;
3512                         break;
3513                 }
3514                 rem -= ie[1] + 2;
3515                 ie += ie[1] + 2;
3516         }
3517
3518         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
3519             ismesh) {
3520                 memset(&iwe, 0, sizeof(iwe));
3521                 iwe.cmd = SIOCGIWMODE;
3522                 if (ismesh)
3523                         iwe.u.mode = IW_MODE_MESH;
3524                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
3525                         iwe.u.mode = IW_MODE_MASTER;
3526                 else
3527                         iwe.u.mode = IW_MODE_ADHOC;
3528                 current_ev = iwe_stream_add_event_check(info, current_ev,
3529                                                         end_buf, &iwe,
3530                                                         IW_EV_UINT_LEN);
3531                 if (IS_ERR(current_ev))
3532                         goto unlock;
3533         }
3534
3535         memset(&iwe, 0, sizeof(iwe));
3536         iwe.cmd = IWEVCUSTOM;
3537         sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
3538         iwe.u.data.length = strlen(buf);
3539         current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3540                                                 &iwe, buf);
3541         if (IS_ERR(current_ev))
3542                 goto unlock;
3543         memset(&iwe, 0, sizeof(iwe));
3544         iwe.cmd = IWEVCUSTOM;
3545         sprintf(buf, " Last beacon: %ums ago",
3546                 elapsed_jiffies_msecs(bss->ts));
3547         iwe.u.data.length = strlen(buf);
3548         current_ev = iwe_stream_add_point_check(info, current_ev,
3549                                                 end_buf, &iwe, buf);
3550         if (IS_ERR(current_ev))
3551                 goto unlock;
3552
3553         current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
3554
3555  unlock:
3556         rcu_read_unlock();
3557         return current_ev;
3558 }
3559
3560
3561 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
3562                                   struct iw_request_info *info,
3563                                   char *buf, size_t len)
3564 {
3565         char *current_ev = buf;
3566         char *end_buf = buf + len;
3567         struct cfg80211_internal_bss *bss;
3568         int err = 0;
3569
3570         spin_lock_bh(&rdev->bss_lock);
3571         cfg80211_bss_expire(rdev);
3572
3573         list_for_each_entry(bss, &rdev->bss_list, list) {
3574                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3575                         err = -E2BIG;
3576                         break;
3577                 }
3578                 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
3579                                            current_ev, end_buf);
3580                 if (IS_ERR(current_ev)) {
3581                         err = PTR_ERR(current_ev);
3582                         break;
3583                 }
3584         }
3585         spin_unlock_bh(&rdev->bss_lock);
3586
3587         if (err)
3588                 return err;
3589         return current_ev - buf;
3590 }
3591
3592
3593 int cfg80211_wext_giwscan(struct net_device *dev,
3594                           struct iw_request_info *info,
3595                           union iwreq_data *wrqu, char *extra)
3596 {
3597         struct iw_point *data = &wrqu->data;
3598         struct cfg80211_registered_device *rdev;
3599         int res;
3600
3601         if (!netif_running(dev))
3602                 return -ENETDOWN;
3603
3604         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3605
3606         if (IS_ERR(rdev))
3607                 return PTR_ERR(rdev);
3608
3609         if (rdev->scan_req || rdev->scan_msg)
3610                 return -EAGAIN;
3611
3612         res = ieee80211_scan_results(rdev, info, extra, data->length);
3613         data->length = 0;
3614         if (res >= 0) {
3615                 data->length = res;
3616                 res = 0;
3617         }
3618
3619         return res;
3620 }
3621 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
3622 #endif