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) 2018-2019 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 <net/arp.h>
  18 #include <net/cfg80211.h>
  19 #include <net/cfg80211-wext.h>
  20 #include <net/iw_handler.h>
  21 #include "core.h"
  22 #include "nl80211.h"
  23 #include "wext-compat.h"
  24 #include "rdev-ops.h"
  25
  26 /**
  27  * DOC: BSS tree/list structure
  28  *
  29  * At the top level, the BSS list is kept in both a list in each
  30  * registered device (@bss_list) as well as an RB-tree for faster
  31  * lookup. In the RB-tree, entries can be looked up using their
  32  * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
  33  * for other BSSes.
  34  *
  35  * Due to the possibility of hidden SSIDs, there's a second level
  36  * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
  37  * The hidden_list connects all BSSes belonging to a single AP
  38  * that has a hidden SSID, and connects beacon and probe response
  39  * entries. For a probe response entry for a hidden SSID, the
  40  * hidden_beacon_bss pointer points to the BSS struct holding the
  41  * beacon's information.
  42  *
  43  * Reference counting is done for all these references except for
  44  * the hidden_list, so that a beacon BSS struct that is otherwise
  45  * not referenced has one reference for being on the bss_list and
  46  * one for each probe response entry that points to it using the
  47  * hidden_beacon_bss pointer. When a BSS struct that has such a
  48  * pointer is get/put, the refcount update is also propagated to
  49  * the referenced struct, this ensure that it cannot get removed
  50  * while somebody is using the probe response version.
  51  *
  52  * Note that the hidden_beacon_bss pointer never changes, due to
  53  * the reference counting. Therefore, no locking is needed for
  54  * it.
  55  *
  56  * Also note that the hidden_beacon_bss pointer is only relevant
  57  * if the driver uses something other than the IEs, e.g. private
  58  * data stored stored in the BSS struct, since the beacon IEs are
  59  * also linked into the probe response struct.
  60  */
  61
  62 /*
  63  * Limit the number of BSS entries stored in mac80211. Each one is
  64  * a bit over 4k at most, so this limits to roughly 4-5M of memory.
  65  * If somebody wants to really attack this though, they'd likely
  66  * use small beacons, and only one type of frame, limiting each of
  67  * the entries to a much smaller size (in order to generate more
  68  * entries in total, so overhead is bigger.)
  69  */
  70 static int bss_entries_limit = 1000;
  71 module_param(bss_entries_limit, int, 0644);
  72 MODULE_PARM_DESC(bss_entries_limit,
  73                  "limit to number of scan BSS entries (per wiphy, default 1000)");
  74
  75 #define IEEE80211_SCAN_RESULT_EXPIRE    (30 * HZ)
  76
  77 static void bss_free(struct cfg80211_internal_bss *bss)
  78 {
  79         struct cfg80211_bss_ies *ies;
  80
  81         if (WARN_ON(atomic_read(&bss->hold)))
  82                 return;
  83
  84         ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
  85         if (ies && !bss->pub.hidden_beacon_bss)
  86                 kfree_rcu(ies, rcu_head);
  87         ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
  88         if (ies)
  89                 kfree_rcu(ies, rcu_head);
  90
  91         /*
  92          * This happens when the module is removed, it doesn't
  93          * really matter any more save for completeness
  94          */
  95         if (!list_empty(&bss->hidden_list))
  96                 list_del(&bss->hidden_list);
  97
  98         kfree(bss);
  99 }
 100
 101 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
 102                                struct cfg80211_internal_bss *bss)
 103 {
 104         lockdep_assert_held(&rdev->bss_lock);
 105
 106         bss->refcount++;
 107         if (bss->pub.hidden_beacon_bss) {
 108                 bss = container_of(bss->pub.hidden_beacon_bss,
 109                                    struct cfg80211_internal_bss,
 110                                    pub);
 111                 bss->refcount++;
 112         }
 113         if (bss->pub.transmitted_bss) {
 114                 bss = container_of(bss->pub.transmitted_bss,
 115                                    struct cfg80211_internal_bss,
 116                                    pub);
 117                 bss->refcount++;
 118         }
 119 }
 120
 121 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
 122                                struct cfg80211_internal_bss *bss)
 123 {
 124         lockdep_assert_held(&rdev->bss_lock);
 125
 126         if (bss->pub.hidden_beacon_bss) {
 127                 struct cfg80211_internal_bss *hbss;
 128                 hbss = container_of(bss->pub.hidden_beacon_bss,
 129                                     struct cfg80211_internal_bss,
 130                                     pub);
 131                 hbss->refcount--;
 132                 if (hbss->refcount == 0)
 133                         bss_free(hbss);
 134         }
 135
 136         if (bss->pub.transmitted_bss) {
 137                 struct cfg80211_internal_bss *tbss;
 138
 139                 tbss = container_of(bss->pub.transmitted_bss,
 140                                     struct cfg80211_internal_bss,
 141                                     pub);
 142                 tbss->refcount--;
 143                 if (tbss->refcount == 0)
 144                         bss_free(tbss);
 145         }
 146
 147         bss->refcount--;
 148         if (bss->refcount == 0)
 149                 bss_free(bss);
 150 }
 151
 152 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
 153                                   struct cfg80211_internal_bss *bss)
 154 {
 155         lockdep_assert_held(&rdev->bss_lock);
 156
 157         if (!list_empty(&bss->hidden_list)) {
 158                 /*
 159                  * don't remove the beacon entry if it has
 160                  * probe responses associated with it
 161                  */
 162                 if (!bss->pub.hidden_beacon_bss)
 163                         return false;
 164                 /*
 165                  * if it's a probe response entry break its
 166                  * link to the other entries in the group
 167                  */
 168                 list_del_init(&bss->hidden_list);
 169         }
 170
 171         list_del_init(&bss->list);
 172         list_del_init(&bss->pub.nontrans_list);
 173         rb_erase(&bss->rbn, &rdev->bss_tree);
 174         rdev->bss_entries--;
 175         WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
 176                   "rdev bss entries[%d]/list[empty:%d] corruption\n",
 177                   rdev->bss_entries, list_empty(&rdev->bss_list));
 178         bss_ref_put(rdev, bss);
 179         return true;
 180 }
 181
 182 bool cfg80211_is_element_inherited(const struct element *elem,
 183                                    const struct element *non_inherit_elem)
 184 {
 185         u8 id_len, ext_id_len, i, loop_len, id;
 186         const u8 *list;
 187
 188         if (elem->id == WLAN_EID_MULTIPLE_BSSID)
 189                 return false;
 190
 191         if (!non_inherit_elem || non_inherit_elem->datalen < 2)
 192                 return true;
 193
 194         /*
 195          * non inheritance element format is:
 196          * ext ID (56) | IDs list len | list | extension IDs list len | list
 197          * Both lists are optional. Both lengths are mandatory.
 198          * This means valid length is:
 199          * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
 200          */
 201         id_len = non_inherit_elem->data[1];
 202         if (non_inherit_elem->datalen < 3 + id_len)
 203                 return true;
 204
 205         ext_id_len = non_inherit_elem->data[2 + id_len];
 206         if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
 207                 return true;
 208
 209         if (elem->id == WLAN_EID_EXTENSION) {
 210                 if (!ext_id_len)
 211                         return true;
 212                 loop_len = ext_id_len;
 213                 list = &non_inherit_elem->data[3 + id_len];
 214                 id = elem->data[0];
 215         } else {
 216                 if (!id_len)
 217                         return true;
 218                 loop_len = id_len;
 219                 list = &non_inherit_elem->data[2];
 220                 id = elem->id;
 221         }
 222
 223         for (i = 0; i < loop_len; i++) {
 224                 if (list[i] == id)
 225                         return false;
 226         }
 227
 228         return true;
 229 }
 230 EXPORT_SYMBOL(cfg80211_is_element_inherited);
 231
 232 static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
 233                                   const u8 *subelement, size_t subie_len,
 234                                   u8 *new_ie, gfp_t gfp)
 235 {
 236         u8 *pos, *tmp;
 237         const u8 *tmp_old, *tmp_new;
 238         const struct element *non_inherit_elem;
 239         u8 *sub_copy;
 240
 241         /* copy subelement as we need to change its content to
 242          * mark an ie after it is processed.
 243          */
 244         sub_copy = kmemdup(subelement, subie_len, gfp);
 245         if (!sub_copy)
 246                 return 0;
 247
 248         pos = &new_ie[0];
 249
 250         /* set new ssid */
 251         tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
 252         if (tmp_new) {
 253                 memcpy(pos, tmp_new, tmp_new[1] + 2);
 254                 pos += (tmp_new[1] + 2);
 255         }
 256
 257         /* get non inheritance list if exists */
 258         non_inherit_elem =
 259                 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
 260                                        sub_copy, subie_len);
 261
 262         /* go through IEs in ie (skip SSID) and subelement,
 263          * merge them into new_ie
 264          */
 265         tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
 266         tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
 267
 268         while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
 269                 if (tmp_old[0] == 0) {
 270                         tmp_old++;
 271                         continue;
 272                 }
 273
 274                 if (tmp_old[0] == WLAN_EID_EXTENSION)
 275                         tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
 276                                                          subie_len);
 277                 else
 278                         tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
 279                                                      subie_len);
 280
 281                 if (!tmp) {
 282                         const struct element *old_elem = (void *)tmp_old;
 283
 284                         /* ie in old ie but not in subelement */
 285                         if (cfg80211_is_element_inherited(old_elem,
 286                                                           non_inherit_elem)) {
 287                                 memcpy(pos, tmp_old, tmp_old[1] + 2);
 288                                 pos += tmp_old[1] + 2;
 289                         }
 290                 } else {
 291                         /* ie in transmitting ie also in subelement,
 292                          * copy from subelement and flag the ie in subelement
 293                          * as copied (by setting eid field to WLAN_EID_SSID,
 294                          * which is skipped anyway).
 295                          * For vendor ie, compare OUI + type + subType to
 296                          * determine if they are the same ie.
 297                          */
 298                         if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
 299                                 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
 300                                         /* same vendor ie, copy from
 301                                          * subelement
 302                                          */
 303                                         memcpy(pos, tmp, tmp[1] + 2);
 304                                         pos += tmp[1] + 2;
 305                                         tmp[0] = WLAN_EID_SSID;
 306                                 } else {
 307                                         memcpy(pos, tmp_old, tmp_old[1] + 2);
 308                                         pos += tmp_old[1] + 2;
 309                                 }
 310                         } else {
 311                                 /* copy ie from subelement into new ie */
 312                                 memcpy(pos, tmp, tmp[1] + 2);
 313                                 pos += tmp[1] + 2;
 314                                 tmp[0] = WLAN_EID_SSID;
 315                         }
 316                 }
 317
 318                 if (tmp_old + tmp_old[1] + 2 - ie == ielen)
 319                         break;
 320
 321                 tmp_old += tmp_old[1] + 2;
 322         }
 323
 324         /* go through subelement again to check if there is any ie not
 325          * copied to new ie, skip ssid, capability, bssid-index ie
 326          */
 327         tmp_new = sub_copy;
 328         while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
 329                 if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
 330                       tmp_new[0] == WLAN_EID_SSID)) {
 331                         memcpy(pos, tmp_new, tmp_new[1] + 2);
 332                         pos += tmp_new[1] + 2;
 333                 }
 334                 if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
 335                         break;
 336                 tmp_new += tmp_new[1] + 2;
 337         }
 338
 339         kfree(sub_copy);
 340         return pos - new_ie;
 341 }
 342
 343 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
 344                    const u8 *ssid, size_t ssid_len)
 345 {
 346         const struct cfg80211_bss_ies *ies;
 347         const u8 *ssidie;
 348
 349         if (bssid && !ether_addr_equal(a->bssid, bssid))
 350                 return false;
 351
 352         if (!ssid)
 353                 return true;
 354
 355         ies = rcu_access_pointer(a->ies);
 356         if (!ies)
 357                 return false;
 358         ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
 359         if (!ssidie)
 360                 return false;
 361         if (ssidie[1] != ssid_len)
 362                 return false;
 363         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
 364 }
 365
 366 static int
 367 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
 368                            struct cfg80211_bss *nontrans_bss)
 369 {
 370         const u8 *ssid;
 371         size_t ssid_len;
 372         struct cfg80211_bss *bss = NULL;
 373
 374         rcu_read_lock();
 375         ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
 376         if (!ssid) {
 377                 rcu_read_unlock();
 378                 return -EINVAL;
 379         }
 380         ssid_len = ssid[1];
 381         ssid = ssid + 2;
 382         rcu_read_unlock();
 383
 384         /* check if nontrans_bss is in the list */
 385         list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
 386                 if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len))
 387                         return 0;
 388         }
 389
 390         /* add to the list */
 391         list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
 392         return 0;
 393 }
 394
 395 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
 396                                   unsigned long expire_time)
 397 {
 398         struct cfg80211_internal_bss *bss, *tmp;
 399         bool expired = false;
 400
 401         lockdep_assert_held(&rdev->bss_lock);
 402
 403         list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
 404                 if (atomic_read(&bss->hold))
 405                         continue;
 406                 if (!time_after(expire_time, bss->ts))
 407                         continue;
 408
 409                 if (__cfg80211_unlink_bss(rdev, bss))
 410                         expired = true;
 411         }
 412
 413         if (expired)
 414                 rdev->bss_generation++;
 415 }
 416
 417 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
 418 {
 419         struct cfg80211_internal_bss *bss, *oldest = NULL;
 420         bool ret;
 421
 422         lockdep_assert_held(&rdev->bss_lock);
 423
 424         list_for_each_entry(bss, &rdev->bss_list, list) {
 425                 if (atomic_read(&bss->hold))
 426                         continue;
 427
 428                 if (!list_empty(&bss->hidden_list) &&
 429                     !bss->pub.hidden_beacon_bss)
 430                         continue;
 431
 432                 if (oldest && time_before(oldest->ts, bss->ts))
 433                         continue;
 434                 oldest = bss;
 435         }
 436
 437         if (WARN_ON(!oldest))
 438                 return false;
 439
 440         /*
 441          * The callers make sure to increase rdev->bss_generation if anything
 442          * gets removed (and a new entry added), so there's no need to also do
 443          * it here.
 444          */
 445
 446         ret = __cfg80211_unlink_bss(rdev, oldest);
 447         WARN_ON(!ret);
 448         return ret;
 449 }
 450
 451 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
 452                            bool send_message)
 453 {
 454         struct cfg80211_scan_request *request;
 455         struct wireless_dev *wdev;
 456         struct sk_buff *msg;
 457 #ifdef CONFIG_CFG80211_WEXT
 458         union iwreq_data wrqu;
 459 #endif
 460
 461         ASSERT_RTNL();
 462
 463         if (rdev->scan_msg) {
 464                 nl80211_send_scan_msg(rdev, rdev->scan_msg);
 465                 rdev->scan_msg = NULL;
 466                 return;
 467         }
 468
 469         request = rdev->scan_req;
 470         if (!request)
 471                 return;
 472
 473         wdev = request->wdev;
 474
 475         /*
 476          * This must be before sending the other events!
 477          * Otherwise, wpa_supplicant gets completely confused with
 478          * wext events.
 479          */
 480         if (wdev->netdev)
 481                 cfg80211_sme_scan_done(wdev->netdev);
 482
 483         if (!request->info.aborted &&
 484             request->flags & NL80211_SCAN_FLAG_FLUSH) {
 485                 /* flush entries from previous scans */
 486                 spin_lock_bh(&rdev->bss_lock);
 487                 __cfg80211_bss_expire(rdev, request->scan_start);
 488                 spin_unlock_bh(&rdev->bss_lock);
 489         }
 490
 491         msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
 492
 493 #ifdef CONFIG_CFG80211_WEXT
 494         if (wdev->netdev && !request->info.aborted) {
 495                 memset(&wrqu, 0, sizeof(wrqu));
 496
 497                 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
 498         }
 499 #endif
 500
 501         if (wdev->netdev)
 502                 dev_put(wdev->netdev);
 503
 504         rdev->scan_req = NULL;
 505         kfree(request);
 506
 507         if (!send_message)
 508                 rdev->scan_msg = msg;
 509         else
 510                 nl80211_send_scan_msg(rdev, msg);
 511 }
 512
 513 void __cfg80211_scan_done(struct work_struct *wk)
 514 {
 515         struct cfg80211_registered_device *rdev;
 516
 517         rdev = container_of(wk, struct cfg80211_registered_device,
 518                             scan_done_wk);
 519
 520         rtnl_lock();
 521         ___cfg80211_scan_done(rdev, true);
 522         rtnl_unlock();
 523 }
 524
 525 void cfg80211_scan_done(struct cfg80211_scan_request *request,
 526                         struct cfg80211_scan_info *info)
 527 {
 528         trace_cfg80211_scan_done(request, info);
 529         WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
 530
 531         request->info = *info;
 532         request->notified = true;
 533         queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
 534 }
 535 EXPORT_SYMBOL(cfg80211_scan_done);
 536
 537 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
 538                                  struct cfg80211_sched_scan_request *req)
 539 {
 540         ASSERT_RTNL();
 541
 542         list_add_rcu(&req->list, &rdev->sched_scan_req_list);
 543 }
 544
 545 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
 546                                         struct cfg80211_sched_scan_request *req)
 547 {
 548         ASSERT_RTNL();
 549
 550         list_del_rcu(&req->list);
 551         kfree_rcu(req, rcu_head);
 552 }
 553
 554 static struct cfg80211_sched_scan_request *
 555 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
 556 {
 557         struct cfg80211_sched_scan_request *pos;
 558
 559         list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
 560                                 lockdep_rtnl_is_held()) {
 561                 if (pos->reqid == reqid)
 562                         return pos;
 563         }
 564         return NULL;
 565 }
 566
 567 /*
 568  * Determines if a scheduled scan request can be handled. When a legacy
 569  * scheduled scan is running no other scheduled scan is allowed regardless
 570  * whether the request is for legacy or multi-support scan. When a multi-support
 571  * scheduled scan is running a request for legacy scan is not allowed. In this
 572  * case a request for multi-support scan can be handled if resources are
 573  * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
 574  */
 575 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
 576                                      bool want_multi)
 577 {
 578         struct cfg80211_sched_scan_request *pos;
 579         int i = 0;
 580
 581         list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
 582                 /* request id zero means legacy in progress */
 583                 if (!i && !pos->reqid)
 584                         return -EINPROGRESS;
 585                 i++;
 586         }
 587
 588         if (i) {
 589                 /* no legacy allowed when multi request(s) are active */
 590                 if (!want_multi)
 591                         return -EINPROGRESS;
 592
 593                 /* resource limit reached */
 594                 if (i == rdev->wiphy.max_sched_scan_reqs)
 595                         return -ENOSPC;
 596         }
 597         return 0;
 598 }
 599
 600 void cfg80211_sched_scan_results_wk(struct work_struct *work)
 601 {
 602         struct cfg80211_registered_device *rdev;
 603         struct cfg80211_sched_scan_request *req, *tmp;
 604
 605         rdev = container_of(work, struct cfg80211_registered_device,
 606                            sched_scan_res_wk);
 607
 608         rtnl_lock();
 609         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 610                 if (req->report_results) {
 611                         req->report_results = false;
 612                         if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
 613                                 /* flush entries from previous scans */
 614                                 spin_lock_bh(&rdev->bss_lock);
 615                                 __cfg80211_bss_expire(rdev, req->scan_start);
 616                                 spin_unlock_bh(&rdev->bss_lock);
 617                                 req->scan_start = jiffies;
 618                         }
 619                         nl80211_send_sched_scan(req,
 620                                                 NL80211_CMD_SCHED_SCAN_RESULTS);
 621                 }
 622         }
 623         rtnl_unlock();
 624 }
 625
 626 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
 627 {
 628         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 629         struct cfg80211_sched_scan_request *request;
 630
 631         trace_cfg80211_sched_scan_results(wiphy, reqid);
 632         /* ignore if we're not scanning */
 633
 634         rcu_read_lock();
 635         request = cfg80211_find_sched_scan_req(rdev, reqid);
 636         if (request) {
 637                 request->report_results = true;
 638                 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
 639         }
 640         rcu_read_unlock();
 641 }
 642 EXPORT_SYMBOL(cfg80211_sched_scan_results);
 643
 644 void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid)
 645 {
 646         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 647
 648         ASSERT_RTNL();
 649
 650         trace_cfg80211_sched_scan_stopped(wiphy, reqid);
 651
 652         __cfg80211_stop_sched_scan(rdev, reqid, true);
 653 }
 654 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
 655
 656 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
 657 {
 658         rtnl_lock();
 659         cfg80211_sched_scan_stopped_rtnl(wiphy, reqid);
 660         rtnl_unlock();
 661 }
 662 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
 663
 664 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
 665                                  struct cfg80211_sched_scan_request *req,
 666                                  bool driver_initiated)
 667 {
 668         ASSERT_RTNL();
 669
 670         if (!driver_initiated) {
 671                 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
 672                 if (err)
 673                         return err;
 674         }
 675
 676         nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
 677
 678         cfg80211_del_sched_scan_req(rdev, req);
 679
 680         return 0;
 681 }
 682
 683 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
 684                                u64 reqid, bool driver_initiated)
 685 {
 686         struct cfg80211_sched_scan_request *sched_scan_req;
 687
 688         ASSERT_RTNL();
 689
 690         sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
 691         if (!sched_scan_req)
 692                 return -ENOENT;
 693
 694         return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
 695                                             driver_initiated);
 696 }
 697
 698 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
 699                       unsigned long age_secs)
 700 {
 701         struct cfg80211_internal_bss *bss;
 702         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
 703
 704         spin_lock_bh(&rdev->bss_lock);
 705         list_for_each_entry(bss, &rdev->bss_list, list)
 706                 bss->ts -= age_jiffies;
 707         spin_unlock_bh(&rdev->bss_lock);
 708 }
 709
 710 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
 711 {
 712         __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
 713 }
 714
 715 const struct element *
 716 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
 717                          const u8 *match, unsigned int match_len,
 718                          unsigned int match_offset)
 719 {
 720         const struct element *elem;
 721
 722         for_each_element_id(elem, eid, ies, len) {
 723                 if (elem->datalen >= match_offset + match_len &&
 724                     !memcmp(elem->data + match_offset, match, match_len))
 725                         return elem;
 726         }
 727
 728         return NULL;
 729 }
 730 EXPORT_SYMBOL(cfg80211_find_elem_match);
 731
 732 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
 733                                                 const u8 *ies,
 734                                                 unsigned int len)
 735 {
 736         const struct element *elem;
 737         u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
 738         int match_len = (oui_type < 0) ? 3 : sizeof(match);
 739
 740         if (WARN_ON(oui_type > 0xff))
 741                 return NULL;
 742
 743         elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
 744                                         match, match_len, 0);
 745
 746         if (!elem || elem->datalen < 4)
 747                 return NULL;
 748
 749         return elem;
 750 }
 751 EXPORT_SYMBOL(cfg80211_find_vendor_elem);
 752
 753 /**
 754  * enum bss_compare_mode - BSS compare mode
 755  * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
 756  * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
 757  * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
 758  */
 759 enum bss_compare_mode {
 760         BSS_CMP_REGULAR,
 761         BSS_CMP_HIDE_ZLEN,
 762         BSS_CMP_HIDE_NUL,
 763 };
 764
 765 static int cmp_bss(struct cfg80211_bss *a,
 766                    struct cfg80211_bss *b,
 767                    enum bss_compare_mode mode)
 768 {
 769         const struct cfg80211_bss_ies *a_ies, *b_ies;
 770         const u8 *ie1 = NULL;
 771         const u8 *ie2 = NULL;
 772         int i, r;
 773
 774         if (a->channel != b->channel)
 775                 return b->channel->center_freq - a->channel->center_freq;
 776
 777         a_ies = rcu_access_pointer(a->ies);
 778         if (!a_ies)
 779                 return -1;
 780         b_ies = rcu_access_pointer(b->ies);
 781         if (!b_ies)
 782                 return 1;
 783
 784         if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
 785                 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
 786                                        a_ies->data, a_ies->len);
 787         if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
 788                 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
 789                                        b_ies->data, b_ies->len);
 790         if (ie1 && ie2) {
 791                 int mesh_id_cmp;
 792
 793                 if (ie1[1] == ie2[1])
 794                         mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
 795                 else
 796                         mesh_id_cmp = ie2[1] - ie1[1];
 797
 798                 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
 799                                        a_ies->data, a_ies->len);
 800                 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
 801                                        b_ies->data, b_ies->len);
 802                 if (ie1 && ie2) {
 803                         if (mesh_id_cmp)
 804                                 return mesh_id_cmp;
 805                         if (ie1[1] != ie2[1])
 806                                 return ie2[1] - ie1[1];
 807                         return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
 808                 }
 809         }
 810
 811         r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
 812         if (r)
 813                 return r;
 814
 815         ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
 816         ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
 817
 818         if (!ie1 && !ie2)
 819                 return 0;
 820
 821         /*
 822          * Note that with "hide_ssid", the function returns a match if
 823          * the already-present BSS ("b") is a hidden SSID beacon for
 824          * the new BSS ("a").
 825          */
 826
 827         /* sort missing IE before (left of) present IE */
 828         if (!ie1)
 829                 return -1;
 830         if (!ie2)
 831                 return 1;
 832
 833         switch (mode) {
 834         case BSS_CMP_HIDE_ZLEN:
 835                 /*
 836                  * In ZLEN mode we assume the BSS entry we're
 837                  * looking for has a zero-length SSID. So if
 838                  * the one we're looking at right now has that,
 839                  * return 0. Otherwise, return the difference
 840                  * in length, but since we're looking for the
 841                  * 0-length it's really equivalent to returning
 842                  * the length of the one we're looking at.
 843                  *
 844                  * No content comparison is needed as we assume
 845                  * the content length is zero.
 846                  */
 847                 return ie2[1];
 848         case BSS_CMP_REGULAR:
 849         default:
 850                 /* sort by length first, then by contents */
 851                 if (ie1[1] != ie2[1])
 852                         return ie2[1] - ie1[1];
 853                 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
 854         case BSS_CMP_HIDE_NUL:
 855                 if (ie1[1] != ie2[1])
 856                         return ie2[1] - ie1[1];
 857                 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
 858                 for (i = 0; i < ie2[1]; i++)
 859                         if (ie2[i + 2])
 860                                 return -1;
 861                 return 0;
 862         }
 863 }
 864
 865 static bool cfg80211_bss_type_match(u16 capability,
 866                                     enum nl80211_band band,
 867                                     enum ieee80211_bss_type bss_type)
 868 {
 869         bool ret = true;
 870         u16 mask, val;
 871
 872         if (bss_type == IEEE80211_BSS_TYPE_ANY)
 873                 return ret;
 874
 875         if (band == NL80211_BAND_60GHZ) {
 876                 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
 877                 switch (bss_type) {
 878                 case IEEE80211_BSS_TYPE_ESS:
 879                         val = WLAN_CAPABILITY_DMG_TYPE_AP;
 880                         break;
 881                 case IEEE80211_BSS_TYPE_PBSS:
 882                         val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
 883                         break;
 884                 case IEEE80211_BSS_TYPE_IBSS:
 885                         val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
 886                         break;
 887                 default:
 888                         return false;
 889                 }
 890         } else {
 891                 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
 892                 switch (bss_type) {
 893                 case IEEE80211_BSS_TYPE_ESS:
 894                         val = WLAN_CAPABILITY_ESS;
 895                         break;
 896                 case IEEE80211_BSS_TYPE_IBSS:
 897                         val = WLAN_CAPABILITY_IBSS;
 898                         break;
 899                 case IEEE80211_BSS_TYPE_MBSS:
 900                         val = 0;
 901                         break;
 902                 default:
 903                         return false;
 904                 }
 905         }
 906
 907         ret = ((capability & mask) == val);
 908         return ret;
 909 }
 910
 911 /* Returned bss is reference counted and must be cleaned up appropriately. */
 912 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
 913                                       struct ieee80211_channel *channel,
 914                                       const u8 *bssid,
 915                                       const u8 *ssid, size_t ssid_len,
 916                                       enum ieee80211_bss_type bss_type,
 917                                       enum ieee80211_privacy privacy)
 918 {
 919         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 920         struct cfg80211_internal_bss *bss, *res = NULL;
 921         unsigned long now = jiffies;
 922         int bss_privacy;
 923
 924         trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
 925                                privacy);
 926
 927         spin_lock_bh(&rdev->bss_lock);
 928
 929         list_for_each_entry(bss, &rdev->bss_list, list) {
 930                 if (!cfg80211_bss_type_match(bss->pub.capability,
 931                                              bss->pub.channel->band, bss_type))
 932                         continue;
 933
 934                 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
 935                 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
 936                     (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
 937                         continue;
 938                 if (channel && bss->pub.channel != channel)
 939                         continue;
 940                 if (!is_valid_ether_addr(bss->pub.bssid))
 941                         continue;
 942                 /* Don't get expired BSS structs */
 943                 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
 944                     !atomic_read(&bss->hold))
 945                         continue;
 946                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
 947                         res = bss;
 948                         bss_ref_get(rdev, res);
 949                         break;
 950                 }
 951         }
 952
 953         spin_unlock_bh(&rdev->bss_lock);
 954         if (!res)
 955                 return NULL;
 956         trace_cfg80211_return_bss(&res->pub);
 957         return &res->pub;
 958 }
 959 EXPORT_SYMBOL(cfg80211_get_bss);
 960
 961 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
 962                           struct cfg80211_internal_bss *bss)
 963 {
 964         struct rb_node **p = &rdev->bss_tree.rb_node;
 965         struct rb_node *parent = NULL;
 966         struct cfg80211_internal_bss *tbss;
 967         int cmp;
 968
 969         while (*p) {
 970                 parent = *p;
 971                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
 972
 973                 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
 974
 975                 if (WARN_ON(!cmp)) {
 976                         /* will sort of leak this BSS */
 977                         return;
 978                 }
 979
 980                 if (cmp < 0)
 981                         p = &(*p)->rb_left;
 982                 else
 983                         p = &(*p)->rb_right;
 984         }
 985
 986         rb_link_node(&bss->rbn, parent, p);
 987         rb_insert_color(&bss->rbn, &rdev->bss_tree);
 988 }
 989
 990 static struct cfg80211_internal_bss *
 991 rb_find_bss(struct cfg80211_registered_device *rdev,
 992             struct cfg80211_internal_bss *res,
 993             enum bss_compare_mode mode)
 994 {
 995         struct rb_node *n = rdev->bss_tree.rb_node;
 996         struct cfg80211_internal_bss *bss;
 997         int r;
 998
 999         while (n) {
1000                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1001                 r = cmp_bss(&res->pub, &bss->pub, mode);
1002
1003                 if (r == 0)
1004                         return bss;
1005                 else if (r < 0)
1006                         n = n->rb_left;
1007                 else
1008                         n = n->rb_right;
1009         }
1010
1011         return NULL;
1012 }
1013
1014 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1015                                    struct cfg80211_internal_bss *new)
1016 {
1017         const struct cfg80211_bss_ies *ies;
1018         struct cfg80211_internal_bss *bss;
1019         const u8 *ie;
1020         int i, ssidlen;
1021         u8 fold = 0;
1022         u32 n_entries = 0;
1023
1024         ies = rcu_access_pointer(new->pub.beacon_ies);
1025         if (WARN_ON(!ies))
1026                 return false;
1027
1028         ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1029         if (!ie) {
1030                 /* nothing to do */
1031                 return true;
1032         }
1033
1034         ssidlen = ie[1];
1035         for (i = 0; i < ssidlen; i++)
1036                 fold |= ie[2 + i];
1037
1038         if (fold) {
1039                 /* not a hidden SSID */
1040                 return true;
1041         }
1042
1043         /* This is the bad part ... */
1044
1045         list_for_each_entry(bss, &rdev->bss_list, list) {
1046                 /*
1047                  * we're iterating all the entries anyway, so take the
1048                  * opportunity to validate the list length accounting
1049                  */
1050                 n_entries++;
1051
1052                 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1053                         continue;
1054                 if (bss->pub.channel != new->pub.channel)
1055                         continue;
1056                 if (bss->pub.scan_width != new->pub.scan_width)
1057                         continue;
1058                 if (rcu_access_pointer(bss->pub.beacon_ies))
1059                         continue;
1060                 ies = rcu_access_pointer(bss->pub.ies);
1061                 if (!ies)
1062                         continue;
1063                 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1064                 if (!ie)
1065                         continue;
1066                 if (ssidlen && ie[1] != ssidlen)
1067                         continue;
1068                 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1069                         continue;
1070                 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1071                         list_del(&bss->hidden_list);
1072                 /* combine them */
1073                 list_add(&bss->hidden_list, &new->hidden_list);
1074                 bss->pub.hidden_beacon_bss = &new->pub;
1075                 new->refcount += bss->refcount;
1076                 rcu_assign_pointer(bss->pub.beacon_ies,
1077                                    new->pub.beacon_ies);
1078         }
1079
1080         WARN_ONCE(n_entries != rdev->bss_entries,
1081                   "rdev bss entries[%d]/list[len:%d] corruption\n",
1082                   rdev->bss_entries, n_entries);
1083
1084         return true;
1085 }
1086
1087 struct cfg80211_non_tx_bss {
1088         struct cfg80211_bss *tx_bss;
1089         u8 max_bssid_indicator;
1090         u8 bssid_index;
1091 };
1092
1093 static bool
1094 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1095                           struct cfg80211_internal_bss *known,
1096                           struct cfg80211_internal_bss *new,
1097                           bool signal_valid)
1098 {
1099         lockdep_assert_held(&rdev->bss_lock);
1100
1101         /* Update IEs */
1102         if (rcu_access_pointer(new->pub.proberesp_ies)) {
1103                 const struct cfg80211_bss_ies *old;
1104
1105                 old = rcu_access_pointer(known->pub.proberesp_ies);
1106
1107                 rcu_assign_pointer(known->pub.proberesp_ies,
1108                                    new->pub.proberesp_ies);
1109                 /* Override possible earlier Beacon frame IEs */
1110                 rcu_assign_pointer(known->pub.ies,
1111                                    new->pub.proberesp_ies);
1112                 if (old)
1113                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1114         } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1115                 const struct cfg80211_bss_ies *old;
1116                 struct cfg80211_internal_bss *bss;
1117
1118                 if (known->pub.hidden_beacon_bss &&
1119                     !list_empty(&known->hidden_list)) {
1120                         const struct cfg80211_bss_ies *f;
1121
1122                         /* The known BSS struct is one of the probe
1123                          * response members of a group, but we're
1124                          * receiving a beacon (beacon_ies in the new
1125                          * bss is used). This can only mean that the
1126                          * AP changed its beacon from not having an
1127                          * SSID to showing it, which is confusing so
1128                          * drop this information.
1129                          */
1130
1131                         f = rcu_access_pointer(new->pub.beacon_ies);
1132                         kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1133                         return false;
1134                 }
1135
1136                 old = rcu_access_pointer(known->pub.beacon_ies);
1137
1138                 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1139
1140                 /* Override IEs if they were from a beacon before */
1141                 if (old == rcu_access_pointer(known->pub.ies))
1142                         rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1143
1144                 /* Assign beacon IEs to all sub entries */
1145                 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1146                         const struct cfg80211_bss_ies *ies;
1147
1148                         ies = rcu_access_pointer(bss->pub.beacon_ies);
1149                         WARN_ON(ies != old);
1150
1151                         rcu_assign_pointer(bss->pub.beacon_ies,
1152                                            new->pub.beacon_ies);
1153                 }
1154
1155                 if (old)
1156                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1157         }
1158
1159         known->pub.beacon_interval = new->pub.beacon_interval;
1160
1161         /* don't update the signal if beacon was heard on
1162          * adjacent channel.
1163          */
1164         if (signal_valid)
1165                 known->pub.signal = new->pub.signal;
1166         known->pub.capability = new->pub.capability;
1167         known->ts = new->ts;
1168         known->ts_boottime = new->ts_boottime;
1169         known->parent_tsf = new->parent_tsf;
1170         known->pub.chains = new->pub.chains;
1171         memcpy(known->pub.chain_signal, new->pub.chain_signal,
1172                IEEE80211_MAX_CHAINS);
1173         ether_addr_copy(known->parent_bssid, new->parent_bssid);
1174         known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1175         known->pub.bssid_index = new->pub.bssid_index;
1176
1177         return true;
1178 }
1179
1180 /* Returned bss is reference counted and must be cleaned up appropriately. */
1181 struct cfg80211_internal_bss *
1182 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1183                     struct cfg80211_internal_bss *tmp,
1184                     bool signal_valid, unsigned long ts)
1185 {
1186         struct cfg80211_internal_bss *found = NULL;
1187
1188         if (WARN_ON(!tmp->pub.channel))
1189                 return NULL;
1190
1191         tmp->ts = ts;
1192
1193         spin_lock_bh(&rdev->bss_lock);
1194
1195         if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1196                 spin_unlock_bh(&rdev->bss_lock);
1197                 return NULL;
1198         }
1199
1200         found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1201
1202         if (found) {
1203                 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1204                         goto drop;
1205         } else {
1206                 struct cfg80211_internal_bss *new;
1207                 struct cfg80211_internal_bss *hidden;
1208                 struct cfg80211_bss_ies *ies;
1209
1210                 /*
1211                  * create a copy -- the "res" variable that is passed in
1212                  * is allocated on the stack since it's not needed in the
1213                  * more common case of an update
1214                  */
1215                 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1216                               GFP_ATOMIC);
1217                 if (!new) {
1218                         ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1219                         if (ies)
1220                                 kfree_rcu(ies, rcu_head);
1221                         ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1222                         if (ies)
1223                                 kfree_rcu(ies, rcu_head);
1224                         goto drop;
1225                 }
1226                 memcpy(new, tmp, sizeof(*new));
1227                 new->refcount = 1;
1228                 INIT_LIST_HEAD(&new->hidden_list);
1229                 INIT_LIST_HEAD(&new->pub.nontrans_list);
1230
1231                 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1232                         hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1233                         if (!hidden)
1234                                 hidden = rb_find_bss(rdev, tmp,
1235                                                      BSS_CMP_HIDE_NUL);
1236                         if (hidden) {
1237                                 new->pub.hidden_beacon_bss = &hidden->pub;
1238                                 list_add(&new->hidden_list,
1239                                          &hidden->hidden_list);
1240                                 hidden->refcount++;
1241                                 rcu_assign_pointer(new->pub.beacon_ies,
1242                                                    hidden->pub.beacon_ies);
1243                         }
1244                 } else {
1245                         /*
1246                          * Ok so we found a beacon, and don't have an entry. If
1247                          * it's a beacon with hidden SSID, we might be in for an
1248                          * expensive search for any probe responses that should
1249                          * be grouped with this beacon for updates ...
1250                          */
1251                         if (!cfg80211_combine_bsses(rdev, new)) {
1252                                 kfree(new);
1253                                 goto drop;
1254                         }
1255                 }
1256
1257                 if (rdev->bss_entries >= bss_entries_limit &&
1258                     !cfg80211_bss_expire_oldest(rdev)) {
1259                         kfree(new);
1260                         goto drop;
1261                 }
1262
1263                 /* This must be before the call to bss_ref_get */
1264                 if (tmp->pub.transmitted_bss) {
1265                         struct cfg80211_internal_bss *pbss =
1266                                 container_of(tmp->pub.transmitted_bss,
1267                                              struct cfg80211_internal_bss,
1268                                              pub);
1269
1270                         new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1271                         bss_ref_get(rdev, pbss);
1272                 }
1273
1274                 list_add_tail(&new->list, &rdev->bss_list);
1275                 rdev->bss_entries++;
1276                 rb_insert_bss(rdev, new);
1277                 found = new;
1278         }
1279
1280         rdev->bss_generation++;
1281         bss_ref_get(rdev, found);
1282         spin_unlock_bh(&rdev->bss_lock);
1283
1284         return found;
1285  drop:
1286         spin_unlock_bh(&rdev->bss_lock);
1287         return NULL;
1288 }
1289
1290 /*
1291  * Update RX channel information based on the available frame payload
1292  * information. This is mainly for the 2.4 GHz band where frames can be received
1293  * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1294  * element to indicate the current (transmitting) channel, but this might also
1295  * be needed on other bands if RX frequency does not match with the actual
1296  * operating channel of a BSS.
1297  */
1298 static struct ieee80211_channel *
1299 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1300                          struct ieee80211_channel *channel,
1301                          enum nl80211_bss_scan_width scan_width)
1302 {
1303         const u8 *tmp;
1304         u32 freq;
1305         int channel_number = -1;
1306         struct ieee80211_channel *alt_channel;
1307
1308         tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1309         if (tmp && tmp[1] == 1) {
1310                 channel_number = tmp[2];
1311         } else {
1312                 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1313                 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1314                         struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1315
1316                         channel_number = htop->primary_chan;
1317                 }
1318         }
1319
1320         if (channel_number < 0) {
1321                 /* No channel information in frame payload */
1322                 return channel;
1323         }
1324
1325         freq = ieee80211_channel_to_frequency(channel_number, channel->band);
1326         alt_channel = ieee80211_get_channel(wiphy, freq);
1327         if (!alt_channel) {
1328                 if (channel->band == NL80211_BAND_2GHZ) {
1329                         /*
1330                          * Better not allow unexpected channels when that could
1331                          * be going beyond the 1-11 range (e.g., discovering
1332                          * BSS on channel 12 when radio is configured for
1333                          * channel 11.
1334                          */
1335                         return NULL;
1336                 }
1337
1338                 /* No match for the payload channel number - ignore it */
1339                 return channel;
1340         }
1341
1342         if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1343             scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1344                 /*
1345                  * Ignore channel number in 5 and 10 MHz channels where there
1346                  * may not be an n:1 or 1:n mapping between frequencies and
1347                  * channel numbers.
1348                  */
1349                 return channel;
1350         }
1351
1352         /*
1353          * Use the channel determined through the payload channel number
1354          * instead of the RX channel reported by the driver.
1355          */
1356         if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1357                 return NULL;
1358         return alt_channel;
1359 }
1360
1361 /* Returned bss is reference counted and must be cleaned up appropriately. */
1362 static struct cfg80211_bss *
1363 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1364                                 struct cfg80211_inform_bss *data,
1365                                 enum cfg80211_bss_frame_type ftype,
1366                                 const u8 *bssid, u64 tsf, u16 capability,
1367                                 u16 beacon_interval, const u8 *ie, size_t ielen,
1368                                 struct cfg80211_non_tx_bss *non_tx_data,
1369                                 gfp_t gfp)
1370 {
1371         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1372         struct cfg80211_bss_ies *ies;
1373         struct ieee80211_channel *channel;
1374         struct cfg80211_internal_bss tmp = {}, *res;
1375         int bss_type;
1376         bool signal_valid;
1377         unsigned long ts;
1378
1379         if (WARN_ON(!wiphy))
1380                 return NULL;
1381
1382         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1383                     (data->signal < 0 || data->signal > 100)))
1384                 return NULL;
1385
1386         channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1387                                            data->scan_width);
1388         if (!channel)
1389                 return NULL;
1390
1391         memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1392         tmp.pub.channel = channel;
1393         tmp.pub.scan_width = data->scan_width;
1394         tmp.pub.signal = data->signal;
1395         tmp.pub.beacon_interval = beacon_interval;
1396         tmp.pub.capability = capability;
1397         tmp.ts_boottime = data->boottime_ns;
1398         if (non_tx_data) {
1399                 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1400                 ts = bss_from_pub(non_tx_data->tx_bss)->ts;
1401                 tmp.pub.bssid_index = non_tx_data->bssid_index;
1402                 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1403         } else {
1404                 ts = jiffies;
1405         }
1406
1407         /*
1408          * If we do not know here whether the IEs are from a Beacon or Probe
1409          * Response frame, we need to pick one of the options and only use it
1410          * with the driver that does not provide the full Beacon/Probe Response
1411          * frame. Use Beacon frame pointer to avoid indicating that this should
1412          * override the IEs pointer should we have received an earlier
1413          * indication of Probe Response data.
1414          */
1415         ies = kzalloc(sizeof(*ies) + ielen, gfp);
1416         if (!ies)
1417                 return NULL;
1418         ies->len = ielen;
1419         ies->tsf = tsf;
1420         ies->from_beacon = false;
1421         memcpy(ies->data, ie, ielen);
1422
1423         switch (ftype) {
1424         case CFG80211_BSS_FTYPE_BEACON:
1425                 ies->from_beacon = true;
1426                 /* fall through */
1427         case CFG80211_BSS_FTYPE_UNKNOWN:
1428                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1429                 break;
1430         case CFG80211_BSS_FTYPE_PRESP:
1431                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1432                 break;
1433         }
1434         rcu_assign_pointer(tmp.pub.ies, ies);
1435
1436         signal_valid = data->chan == channel;
1437         res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
1438         if (!res)
1439                 return NULL;
1440
1441         if (channel->band == NL80211_BAND_60GHZ) {
1442                 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1443                 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1444                     bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1445                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1446         } else {
1447                 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1448                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1449         }
1450
1451         if (non_tx_data) {
1452                 /* this is a nontransmitting bss, we need to add it to
1453                  * transmitting bss' list if it is not there
1454                  */
1455                 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1456                                                &res->pub)) {
1457                         if (__cfg80211_unlink_bss(rdev, res))
1458                                 rdev->bss_generation++;
1459                 }
1460         }
1461
1462         trace_cfg80211_return_bss(&res->pub);
1463         /* cfg80211_bss_update gives us a referenced result */
1464         return &res->pub;
1465 }
1466
1467 static const struct element
1468 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1469                                    const struct element *mbssid_elem,
1470                                    const struct element *sub_elem)
1471 {
1472         const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1473         const struct element *next_mbssid;
1474         const struct element *next_sub;
1475
1476         next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1477                                          mbssid_end,
1478                                          ielen - (mbssid_end - ie));
1479
1480         /*
1481          * If is is not the last subelement in current MBSSID IE or there isn't
1482          * a next MBSSID IE - profile is complete.
1483         */
1484         if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
1485             !next_mbssid)
1486                 return NULL;
1487
1488         /* For any length error, just return NULL */
1489
1490         if (next_mbssid->datalen < 4)
1491                 return NULL;
1492
1493         next_sub = (void *)&next_mbssid->data[1];
1494
1495         if (next_mbssid->data + next_mbssid->datalen <
1496             next_sub->data + next_sub->datalen)
1497                 return NULL;
1498
1499         if (next_sub->id != 0 || next_sub->datalen < 2)
1500                 return NULL;
1501
1502         /*
1503          * Check if the first element in the next sub element is a start
1504          * of a new profile
1505          */
1506         return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
1507                NULL : next_mbssid;
1508 }
1509
1510 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
1511                               const struct element *mbssid_elem,
1512                               const struct element *sub_elem,
1513                               u8 *merged_ie, size_t max_copy_len)
1514 {
1515         size_t copied_len = sub_elem->datalen;
1516         const struct element *next_mbssid;
1517
1518         if (sub_elem->datalen > max_copy_len)
1519                 return 0;
1520
1521         memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
1522
1523         while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
1524                                                                 mbssid_elem,
1525                                                                 sub_elem))) {
1526                 const struct element *next_sub = (void *)&next_mbssid->data[1];
1527
1528                 if (copied_len + next_sub->datalen > max_copy_len)
1529                         break;
1530                 memcpy(merged_ie + copied_len, next_sub->data,
1531                        next_sub->datalen);
1532                 copied_len += next_sub->datalen;
1533         }
1534
1535         return copied_len;
1536 }
1537 EXPORT_SYMBOL(cfg80211_merge_profile);
1538
1539 static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
1540                                        struct cfg80211_inform_bss *data,
1541                                        enum cfg80211_bss_frame_type ftype,
1542                                        const u8 *bssid, u64 tsf,
1543                                        u16 beacon_interval, const u8 *ie,
1544                                        size_t ielen,
1545                                        struct cfg80211_non_tx_bss *non_tx_data,
1546                                        gfp_t gfp)
1547 {
1548         const u8 *mbssid_index_ie;
1549         const struct element *elem, *sub;
1550         size_t new_ie_len;
1551         u8 new_bssid[ETH_ALEN];
1552         u8 *new_ie, *profile;
1553         u64 seen_indices = 0;
1554         u16 capability;
1555         struct cfg80211_bss *bss;
1556
1557         if (!non_tx_data)
1558                 return;
1559         if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1560                 return;
1561         if (!wiphy->support_mbssid)
1562                 return;
1563         if (wiphy->support_only_he_mbssid &&
1564             !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1565                 return;
1566
1567         new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
1568         if (!new_ie)
1569                 return;
1570
1571         profile = kmalloc(ielen, gfp);
1572         if (!profile)
1573                 goto out;
1574
1575         for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
1576                 if (elem->datalen < 4)
1577                         continue;
1578                 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
1579                         u8 profile_len;
1580
1581                         if (sub->id != 0 || sub->datalen < 4) {
1582                                 /* not a valid BSS profile */
1583                                 continue;
1584                         }
1585
1586                         if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
1587                             sub->data[1] != 2) {
1588                                 /* The first element within the Nontransmitted
1589                                  * BSSID Profile is not the Nontransmitted
1590                                  * BSSID Capability element.
1591                                  */
1592                                 continue;
1593                         }
1594
1595                         memset(profile, 0, ielen);
1596                         profile_len = cfg80211_merge_profile(ie, ielen,
1597                                                              elem,
1598                                                              sub,
1599                                                              profile,
1600                                                              ielen);
1601
1602                         /* found a Nontransmitted BSSID Profile */
1603                         mbssid_index_ie = cfg80211_find_ie
1604                                 (WLAN_EID_MULTI_BSSID_IDX,
1605                                  profile, profile_len);
1606                         if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
1607                             mbssid_index_ie[2] == 0 ||
1608                             mbssid_index_ie[2] > 46) {
1609                                 /* No valid Multiple BSSID-Index element */
1610                                 continue;
1611                         }
1612
1613                         if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
1614                                 /* We don't support legacy split of a profile */
1615                                 net_dbg_ratelimited("Partial info for BSSID index %d\n",
1616                                                     mbssid_index_ie[2]);
1617
1618                         seen_indices |= BIT_ULL(mbssid_index_ie[2]);
1619
1620                         non_tx_data->bssid_index = mbssid_index_ie[2];
1621                         non_tx_data->max_bssid_indicator = elem->data[0];
1622
1623                         cfg80211_gen_new_bssid(bssid,
1624                                                non_tx_data->max_bssid_indicator,
1625                                                non_tx_data->bssid_index,
1626                                                new_bssid);
1627                         memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
1628                         new_ie_len = cfg80211_gen_new_ie(ie, ielen,
1629                                                          profile,
1630                                                          profile_len, new_ie,
1631                                                          gfp);
1632                         if (!new_ie_len)
1633                                 continue;
1634
1635                         capability = get_unaligned_le16(profile + 2);
1636                         bss = cfg80211_inform_single_bss_data(wiphy, data,
1637                                                               ftype,
1638                                                               new_bssid, tsf,
1639                                                               capability,
1640                                                               beacon_interval,
1641                                                               new_ie,
1642                                                               new_ie_len,
1643                                                               non_tx_data,
1644                                                               gfp);
1645                         if (!bss)
1646                                 break;
1647                         cfg80211_put_bss(wiphy, bss);
1648                 }
1649         }
1650
1651 out:
1652         kfree(new_ie);
1653         kfree(profile);
1654 }
1655
1656 struct cfg80211_bss *
1657 cfg80211_inform_bss_data(struct wiphy *wiphy,
1658                          struct cfg80211_inform_bss *data,
1659                          enum cfg80211_bss_frame_type ftype,
1660                          const u8 *bssid, u64 tsf, u16 capability,
1661                          u16 beacon_interval, const u8 *ie, size_t ielen,
1662                          gfp_t gfp)
1663 {
1664         struct cfg80211_bss *res;
1665         struct cfg80211_non_tx_bss non_tx_data;
1666
1667         res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
1668                                               capability, beacon_interval, ie,
1669                                               ielen, NULL, gfp);
1670         if (!res)
1671                 return NULL;
1672         non_tx_data.tx_bss = res;
1673         cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
1674                                    beacon_interval, ie, ielen, &non_tx_data,
1675                                    gfp);
1676         return res;
1677 }
1678 EXPORT_SYMBOL(cfg80211_inform_bss_data);
1679
1680 static void
1681 cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
1682                                  struct cfg80211_inform_bss *data,
1683                                  struct ieee80211_mgmt *mgmt, size_t len,
1684                                  struct cfg80211_non_tx_bss *non_tx_data,
1685                                  gfp_t gfp)
1686 {
1687         enum cfg80211_bss_frame_type ftype;
1688         const u8 *ie = mgmt->u.probe_resp.variable;
1689         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1690                                       u.probe_resp.variable);
1691
1692         ftype = ieee80211_is_beacon(mgmt->frame_control) ?
1693                 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
1694
1695         cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
1696                                    le64_to_cpu(mgmt->u.probe_resp.timestamp),
1697                                    le16_to_cpu(mgmt->u.probe_resp.beacon_int),
1698                                    ie, ielen, non_tx_data, gfp);
1699 }
1700
1701 static void
1702 cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
1703                                    struct cfg80211_bss *nontrans_bss,
1704                                    struct ieee80211_mgmt *mgmt, size_t len)
1705 {
1706         u8 *ie, *new_ie, *pos;
1707         const u8 *nontrans_ssid, *trans_ssid, *mbssid;
1708         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1709                                       u.probe_resp.variable);
1710         size_t new_ie_len;
1711         struct cfg80211_bss_ies *new_ies;
1712         const struct cfg80211_bss_ies *old;
1713         u8 cpy_len;
1714
1715         lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
1716
1717         ie = mgmt->u.probe_resp.variable;
1718
1719         new_ie_len = ielen;
1720         trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
1721         if (!trans_ssid)
1722                 return;
1723         new_ie_len -= trans_ssid[1];
1724         mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
1725         /*
1726          * It's not valid to have the MBSSID element before SSID
1727          * ignore if that happens - the code below assumes it is
1728          * after (while copying things inbetween).
1729          */
1730         if (!mbssid || mbssid < trans_ssid)
1731                 return;
1732         new_ie_len -= mbssid[1];
1733
1734         nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
1735         if (!nontrans_ssid)
1736                 return;
1737
1738         new_ie_len += nontrans_ssid[1];
1739
1740         /* generate new ie for nontrans BSS
1741          * 1. replace SSID with nontrans BSS' SSID
1742          * 2. skip MBSSID IE
1743          */
1744         new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
1745         if (!new_ie)
1746                 return;
1747
1748         new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
1749         if (!new_ies)
1750                 goto out_free;
1751
1752         pos = new_ie;
1753
1754         /* copy the nontransmitted SSID */
1755         cpy_len = nontrans_ssid[1] + 2;
1756         memcpy(pos, nontrans_ssid, cpy_len);
1757         pos += cpy_len;
1758         /* copy the IEs between SSID and MBSSID */
1759         cpy_len = trans_ssid[1] + 2;
1760         memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
1761         pos += (mbssid - (trans_ssid + cpy_len));
1762         /* copy the IEs after MBSSID */
1763         cpy_len = mbssid[1] + 2;
1764         memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
1765
1766         /* update ie */
1767         new_ies->len = new_ie_len;
1768         new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1769         new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1770         memcpy(new_ies->data, new_ie, new_ie_len);
1771         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
1772                 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
1773                 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
1774                 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1775                 if (old)
1776                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1777         } else {
1778                 old = rcu_access_pointer(nontrans_bss->beacon_ies);
1779                 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
1780                 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1781                 if (old)
1782                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1783         }
1784
1785 out_free:
1786         kfree(new_ie);
1787 }
1788
1789 /* cfg80211_inform_bss_width_frame helper */
1790 static struct cfg80211_bss *
1791 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
1792                                       struct cfg80211_inform_bss *data,
1793                                       struct ieee80211_mgmt *mgmt, size_t len,
1794                                       gfp_t gfp)
1795 {
1796         struct cfg80211_internal_bss tmp = {}, *res;
1797         struct cfg80211_bss_ies *ies;
1798         struct ieee80211_channel *channel;
1799         bool signal_valid;
1800         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1801                                       u.probe_resp.variable);
1802         int bss_type;
1803
1804         BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1805                         offsetof(struct ieee80211_mgmt, u.beacon.variable));
1806
1807         trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
1808
1809         if (WARN_ON(!mgmt))
1810                 return NULL;
1811
1812         if (WARN_ON(!wiphy))
1813                 return NULL;
1814
1815         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1816                     (data->signal < 0 || data->signal > 100)))
1817                 return NULL;
1818
1819         if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1820                 return NULL;
1821
1822         channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1823                                            ielen, data->chan, data->scan_width);
1824         if (!channel)
1825                 return NULL;
1826
1827         ies = kzalloc(sizeof(*ies) + ielen, gfp);
1828         if (!ies)
1829                 return NULL;
1830         ies->len = ielen;
1831         ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1832         ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1833         memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1834
1835         if (ieee80211_is_probe_resp(mgmt->frame_control))
1836                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1837         else
1838                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1839         rcu_assign_pointer(tmp.pub.ies, ies);
1840
1841         memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1842         tmp.pub.channel = channel;
1843         tmp.pub.scan_width = data->scan_width;
1844         tmp.pub.signal = data->signal;
1845         tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1846         tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1847         tmp.ts_boottime = data->boottime_ns;
1848         tmp.parent_tsf = data->parent_tsf;
1849         tmp.pub.chains = data->chains;
1850         memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
1851         ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1852
1853         signal_valid = data->chan == channel;
1854         res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1855                                   jiffies);
1856         if (!res)
1857                 return NULL;
1858
1859         if (channel->band == NL80211_BAND_60GHZ) {
1860                 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1861                 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1862                     bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1863                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1864         } else {
1865                 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1866                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1867         }
1868
1869         trace_cfg80211_return_bss(&res->pub);
1870         /* cfg80211_bss_update gives us a referenced result */
1871         return &res->pub;
1872 }
1873
1874 struct cfg80211_bss *
1875 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1876                                struct cfg80211_inform_bss *data,
1877                                struct ieee80211_mgmt *mgmt, size_t len,
1878                                gfp_t gfp)
1879 {
1880         struct cfg80211_bss *res, *tmp_bss;
1881         const u8 *ie = mgmt->u.probe_resp.variable;
1882         const struct cfg80211_bss_ies *ies1, *ies2;
1883         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1884                                       u.probe_resp.variable);
1885         struct cfg80211_non_tx_bss non_tx_data;
1886
1887         res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
1888                                                     len, gfp);
1889         if (!res || !wiphy->support_mbssid ||
1890             !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1891                 return res;
1892         if (wiphy->support_only_he_mbssid &&
1893             !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1894                 return res;
1895
1896         non_tx_data.tx_bss = res;
1897         /* process each non-transmitting bss */
1898         cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
1899                                          &non_tx_data, gfp);
1900
1901         spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
1902
1903         /* check if the res has other nontransmitting bss which is not
1904          * in MBSSID IE
1905          */
1906         ies1 = rcu_access_pointer(res->ies);
1907
1908         /* go through nontrans_list, if the timestamp of the BSS is
1909          * earlier than the timestamp of the transmitting BSS then
1910          * update it
1911          */
1912         list_for_each_entry(tmp_bss, &res->nontrans_list,
1913                             nontrans_list) {
1914                 ies2 = rcu_access_pointer(tmp_bss->ies);
1915                 if (ies2->tsf < ies1->tsf)
1916                         cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
1917                                                            mgmt, len);
1918         }
1919         spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
1920
1921         return res;
1922 }
1923 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1924
1925 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1926 {
1927         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1928         struct cfg80211_internal_bss *bss;
1929
1930         if (!pub)
1931                 return;
1932
1933         bss = container_of(pub, struct cfg80211_internal_bss, pub);
1934
1935         spin_lock_bh(&rdev->bss_lock);
1936         bss_ref_get(rdev, bss);
1937         spin_unlock_bh(&rdev->bss_lock);
1938 }
1939 EXPORT_SYMBOL(cfg80211_ref_bss);
1940
1941 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1942 {
1943         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1944         struct cfg80211_internal_bss *bss;
1945
1946         if (!pub)
1947                 return;
1948
1949         bss = container_of(pub, struct cfg80211_internal_bss, pub);
1950
1951         spin_lock_bh(&rdev->bss_lock);
1952         bss_ref_put(rdev, bss);
1953         spin_unlock_bh(&rdev->bss_lock);
1954 }
1955 EXPORT_SYMBOL(cfg80211_put_bss);
1956
1957 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1958 {
1959         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1960         struct cfg80211_internal_bss *bss, *tmp1;
1961         struct cfg80211_bss *nontrans_bss, *tmp;
1962
1963         if (WARN_ON(!pub))
1964                 return;
1965
1966         bss = container_of(pub, struct cfg80211_internal_bss, pub);
1967
1968         spin_lock_bh(&rdev->bss_lock);
1969         if (list_empty(&bss->list))
1970                 goto out;
1971
1972         list_for_each_entry_safe(nontrans_bss, tmp,
1973                                  &pub->nontrans_list,
1974                                  nontrans_list) {
1975                 tmp1 = container_of(nontrans_bss,
1976                                     struct cfg80211_internal_bss, pub);
1977                 if (__cfg80211_unlink_bss(rdev, tmp1))
1978                         rdev->bss_generation++;
1979         }
1980
1981         if (__cfg80211_unlink_bss(rdev, bss))
1982                 rdev->bss_generation++;
1983 out:
1984         spin_unlock_bh(&rdev->bss_lock);
1985 }
1986 EXPORT_SYMBOL(cfg80211_unlink_bss);
1987
1988 void cfg80211_bss_iter(struct wiphy *wiphy,
1989                        struct cfg80211_chan_def *chandef,
1990                        void (*iter)(struct wiphy *wiphy,
1991                                     struct cfg80211_bss *bss,
1992                                     void *data),
1993                        void *iter_data)
1994 {
1995         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1996         struct cfg80211_internal_bss *bss;
1997
1998         spin_lock_bh(&rdev->bss_lock);
1999
2000         list_for_each_entry(bss, &rdev->bss_list, list) {
2001                 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
2002                         iter(wiphy, &bss->pub, iter_data);
2003         }
2004
2005         spin_unlock_bh(&rdev->bss_lock);
2006 }
2007 EXPORT_SYMBOL(cfg80211_bss_iter);
2008
2009 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
2010                                      struct ieee80211_channel *chan)
2011 {
2012         struct wiphy *wiphy = wdev->wiphy;
2013         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2014         struct cfg80211_internal_bss *cbss = wdev->current_bss;
2015         struct cfg80211_internal_bss *new = NULL;
2016         struct cfg80211_internal_bss *bss;
2017         struct cfg80211_bss *nontrans_bss;
2018         struct cfg80211_bss *tmp;
2019
2020         spin_lock_bh(&rdev->bss_lock);
2021
2022         /*
2023          * Some APs use CSA also for bandwidth changes, i.e., without actually
2024          * changing the control channel, so no need to update in such a case.
2025          */
2026         if (cbss->pub.channel == chan)
2027                 goto done;
2028
2029         /* use transmitting bss */
2030         if (cbss->pub.transmitted_bss)
2031                 cbss = container_of(cbss->pub.transmitted_bss,
2032                                     struct cfg80211_internal_bss,
2033                                     pub);
2034
2035         cbss->pub.channel = chan;
2036
2037         list_for_each_entry(bss, &rdev->bss_list, list) {
2038                 if (!cfg80211_bss_type_match(bss->pub.capability,
2039                                              bss->pub.channel->band,
2040                                              wdev->conn_bss_type))
2041                         continue;
2042
2043                 if (bss == cbss)
2044                         continue;
2045
2046                 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2047                         new = bss;
2048                         break;
2049                 }
2050         }
2051
2052         if (new) {
2053                 /* to save time, update IEs for transmitting bss only */
2054                 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2055                         new->pub.proberesp_ies = NULL;
2056                         new->pub.beacon_ies = NULL;
2057                 }
2058
2059                 list_for_each_entry_safe(nontrans_bss, tmp,
2060                                          &new->pub.nontrans_list,
2061                                          nontrans_list) {
2062                         bss = container_of(nontrans_bss,
2063                                            struct cfg80211_internal_bss, pub);
2064                         if (__cfg80211_unlink_bss(rdev, bss))
2065                                 rdev->bss_generation++;
2066                 }
2067
2068                 WARN_ON(atomic_read(&new->hold));
2069                 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2070                         rdev->bss_generation++;
2071         }
2072
2073         rb_erase(&cbss->rbn, &rdev->bss_tree);
2074         rb_insert_bss(rdev, cbss);
2075         rdev->bss_generation++;
2076
2077         list_for_each_entry_safe(nontrans_bss, tmp,
2078                                  &cbss->pub.nontrans_list,
2079                                  nontrans_list) {
2080                 bss = container_of(nontrans_bss,
2081                                    struct cfg80211_internal_bss, pub);
2082                 bss->pub.channel = chan;
2083                 rb_erase(&bss->rbn, &rdev->bss_tree);
2084                 rb_insert_bss(rdev, bss);
2085                 rdev->bss_generation++;
2086         }
2087
2088 done:
2089         spin_unlock_bh(&rdev->bss_lock);
2090 }
2091
2092 #ifdef CONFIG_CFG80211_WEXT
2093 static struct cfg80211_registered_device *
2094 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2095 {
2096         struct cfg80211_registered_device *rdev;
2097         struct net_device *dev;
2098
2099         ASSERT_RTNL();
2100
2101         dev = dev_get_by_index(net, ifindex);
2102         if (!dev)
2103                 return ERR_PTR(-ENODEV);
2104         if (dev->ieee80211_ptr)
2105                 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2106         else
2107                 rdev = ERR_PTR(-ENODEV);
2108         dev_put(dev);
2109         return rdev;
2110 }
2111
2112 int cfg80211_wext_siwscan(struct net_device *dev,
2113                           struct iw_request_info *info,
2114                           union iwreq_data *wrqu, char *extra)
2115 {
2116         struct cfg80211_registered_device *rdev;
2117         struct wiphy *wiphy;
2118         struct iw_scan_req *wreq = NULL;
2119         struct cfg80211_scan_request *creq = NULL;
2120         int i, err, n_channels = 0;
2121         enum nl80211_band band;
2122
2123         if (!netif_running(dev))
2124                 return -ENETDOWN;
2125
2126         if (wrqu->data.length == sizeof(struct iw_scan_req))
2127                 wreq = (struct iw_scan_req *)extra;
2128
2129         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2130
2131         if (IS_ERR(rdev))
2132                 return PTR_ERR(rdev);
2133
2134         if (rdev->scan_req || rdev->scan_msg) {
2135                 err = -EBUSY;
2136                 goto out;
2137         }
2138
2139         wiphy = &rdev->wiphy;
2140
2141         /* Determine number of channels, needed to allocate creq */
2142         if (wreq && wreq->num_channels)
2143                 n_channels = wreq->num_channels;
2144         else
2145                 n_channels = ieee80211_get_num_supported_channels(wiphy);
2146
2147         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2148                        n_channels * sizeof(void *),
2149                        GFP_ATOMIC);
2150         if (!creq) {
2151                 err = -ENOMEM;
2152                 goto out;
2153         }
2154
2155         creq->wiphy = wiphy;
2156         creq->wdev = dev->ieee80211_ptr;
2157         /* SSIDs come after channels */
2158         creq->ssids = (void *)&creq->channels[n_channels];
2159         creq->n_channels = n_channels;
2160         creq->n_ssids = 1;
2161         creq->scan_start = jiffies;
2162
2163         /* translate "Scan on frequencies" request */
2164         i = 0;
2165         for (band = 0; band < NUM_NL80211_BANDS; band++) {
2166                 int j;
2167
2168                 if (!wiphy->bands[band])
2169                         continue;
2170
2171                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2172                         /* ignore disabled channels */
2173                         if (wiphy->bands[band]->channels[j].flags &
2174                                                 IEEE80211_CHAN_DISABLED)
2175                                 continue;
2176
2177                         /* If we have a wireless request structure and the
2178                          * wireless request specifies frequencies, then search
2179                          * for the matching hardware channel.
2180                          */
2181                         if (wreq && wreq->num_channels) {
2182                                 int k;
2183                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2184                                 for (k = 0; k < wreq->num_channels; k++) {
2185                                         struct iw_freq *freq =
2186                                                 &wreq->channel_list[k];
2187                                         int wext_freq =
2188                                                 cfg80211_wext_freq(freq);
2189
2190                                         if (wext_freq == wiphy_freq)
2191                                                 goto wext_freq_found;
2192                                 }
2193                                 goto wext_freq_not_found;
2194                         }
2195
2196                 wext_freq_found:
2197                         creq->channels[i] = &wiphy->bands[band]->channels[j];
2198                         i++;
2199                 wext_freq_not_found: ;
2200                 }
2201         }
2202         /* No channels found? */
2203         if (!i) {
2204                 err = -EINVAL;
2205                 goto out;
2206         }
2207
2208         /* Set real number of channels specified in creq->channels[] */
2209         creq->n_channels = i;
2210
2211         /* translate "Scan for SSID" request */
2212         if (wreq) {
2213                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2214                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2215                                 err = -EINVAL;
2216                                 goto out;
2217                         }
2218                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2219                         creq->ssids[0].ssid_len = wreq->essid_len;
2220                 }
2221                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2222                         creq->n_ssids = 0;
2223         }
2224
2225         for (i = 0; i < NUM_NL80211_BANDS; i++)
2226                 if (wiphy->bands[i])
2227                         creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2228
2229         eth_broadcast_addr(creq->bssid);
2230
2231         rdev->scan_req = creq;
2232         err = rdev_scan(rdev, creq);
2233         if (err) {
2234                 rdev->scan_req = NULL;
2235                 /* creq will be freed below */
2236         } else {
2237                 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2238                 /* creq now owned by driver */
2239                 creq = NULL;
2240                 dev_hold(dev);
2241         }
2242  out:
2243         kfree(creq);
2244         return err;
2245 }
2246 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2247
2248 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2249                                     const struct cfg80211_bss_ies *ies,
2250                                     char *current_ev, char *end_buf)
2251 {
2252         const u8 *pos, *end, *next;
2253         struct iw_event iwe;
2254
2255         if (!ies)
2256                 return current_ev;
2257
2258         /*
2259          * If needed, fragment the IEs buffer (at IE boundaries) into short
2260          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2261          */
2262         pos = ies->data;
2263         end = pos + ies->len;
2264
2265         while (end - pos > IW_GENERIC_IE_MAX) {
2266                 next = pos + 2 + pos[1];
2267                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2268                         next = next + 2 + next[1];
2269
2270                 memset(&iwe, 0, sizeof(iwe));
2271                 iwe.cmd = IWEVGENIE;
2272                 iwe.u.data.length = next - pos;
2273                 current_ev = iwe_stream_add_point_check(info, current_ev,
2274                                                         end_buf, &iwe,
2275                                                         (void *)pos);
2276                 if (IS_ERR(current_ev))
2277                         return current_ev;
2278                 pos = next;
2279         }
2280
2281         if (end > pos) {
2282                 memset(&iwe, 0, sizeof(iwe));
2283                 iwe.cmd = IWEVGENIE;
2284                 iwe.u.data.length = end - pos;
2285                 current_ev = iwe_stream_add_point_check(info, current_ev,
2286                                                         end_buf, &iwe,
2287                                                         (void *)pos);
2288                 if (IS_ERR(current_ev))
2289                         return current_ev;
2290         }
2291
2292         return current_ev;
2293 }
2294
2295 static char *
2296 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2297               struct cfg80211_internal_bss *bss, char *current_ev,
2298               char *end_buf)
2299 {
2300         const struct cfg80211_bss_ies *ies;
2301         struct iw_event iwe;
2302         const u8 *ie;
2303         u8 buf[50];
2304         u8 *cfg, *p, *tmp;
2305         int rem, i, sig;
2306         bool ismesh = false;
2307
2308         memset(&iwe, 0, sizeof(iwe));
2309         iwe.cmd = SIOCGIWAP;
2310         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2311         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2312         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2313                                                 IW_EV_ADDR_LEN);
2314         if (IS_ERR(current_ev))
2315                 return current_ev;
2316
2317         memset(&iwe, 0, sizeof(iwe));
2318         iwe.cmd = SIOCGIWFREQ;
2319         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2320         iwe.u.freq.e = 0;
2321         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2322                                                 IW_EV_FREQ_LEN);
2323         if (IS_ERR(current_ev))
2324                 return current_ev;
2325
2326         memset(&iwe, 0, sizeof(iwe));
2327         iwe.cmd = SIOCGIWFREQ;
2328         iwe.u.freq.m = bss->pub.channel->center_freq;
2329         iwe.u.freq.e = 6;
2330         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2331                                                 IW_EV_FREQ_LEN);
2332         if (IS_ERR(current_ev))
2333                 return current_ev;
2334
2335         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2336                 memset(&iwe, 0, sizeof(iwe));
2337                 iwe.cmd = IWEVQUAL;
2338                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2339                                      IW_QUAL_NOISE_INVALID |
2340                                      IW_QUAL_QUAL_UPDATED;
2341                 switch (wiphy->signal_type) {
2342                 case CFG80211_SIGNAL_TYPE_MBM:
2343                         sig = bss->pub.signal / 100;
2344                         iwe.u.qual.level = sig;
2345                         iwe.u.qual.updated |= IW_QUAL_DBM;
2346                         if (sig < -110)         /* rather bad */
2347                                 sig = -110;
2348                         else if (sig > -40)     /* perfect */
2349                                 sig = -40;
2350                         /* will give a range of 0 .. 70 */
2351                         iwe.u.qual.qual = sig + 110;
2352                         break;
2353                 case CFG80211_SIGNAL_TYPE_UNSPEC:
2354                         iwe.u.qual.level = bss->pub.signal;
2355                         /* will give range 0 .. 100 */
2356                         iwe.u.qual.qual = bss->pub.signal;
2357                         break;
2358                 default:
2359                         /* not reached */
2360                         break;
2361                 }
2362                 current_ev = iwe_stream_add_event_check(info, current_ev,
2363                                                         end_buf, &iwe,
2364                                                         IW_EV_QUAL_LEN);
2365                 if (IS_ERR(current_ev))
2366                         return current_ev;
2367         }
2368
2369         memset(&iwe, 0, sizeof(iwe));
2370         iwe.cmd = SIOCGIWENCODE;
2371         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2372                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2373         else
2374                 iwe.u.data.flags = IW_ENCODE_DISABLED;
2375         iwe.u.data.length = 0;
2376         current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2377                                                 &iwe, "");
2378         if (IS_ERR(current_ev))
2379                 return current_ev;
2380
2381         rcu_read_lock();
2382         ies = rcu_dereference(bss->pub.ies);
2383         rem = ies->len;
2384         ie = ies->data;
2385
2386         while (rem >= 2) {
2387                 /* invalid data */
2388                 if (ie[1] > rem - 2)
2389                         break;
2390
2391                 switch (ie[0]) {
2392                 case WLAN_EID_SSID:
2393                         memset(&iwe, 0, sizeof(iwe));
2394                         iwe.cmd = SIOCGIWESSID;
2395                         iwe.u.data.length = ie[1];
2396                         iwe.u.data.flags = 1;
2397                         current_ev = iwe_stream_add_point_check(info,
2398                                                                 current_ev,
2399                                                                 end_buf, &iwe,
2400                                                                 (u8 *)ie + 2);
2401                         if (IS_ERR(current_ev))
2402                                 goto unlock;
2403                         break;
2404                 case WLAN_EID_MESH_ID:
2405                         memset(&iwe, 0, sizeof(iwe));
2406                         iwe.cmd = SIOCGIWESSID;
2407                         iwe.u.data.length = ie[1];
2408                         iwe.u.data.flags = 1;
2409                         current_ev = iwe_stream_add_point_check(info,
2410                                                                 current_ev,
2411                                                                 end_buf, &iwe,
2412                                                                 (u8 *)ie + 2);
2413                         if (IS_ERR(current_ev))
2414                                 goto unlock;
2415                         break;
2416                 case WLAN_EID_MESH_CONFIG:
2417                         ismesh = true;
2418                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2419                                 break;
2420                         cfg = (u8 *)ie + 2;
2421                         memset(&iwe, 0, sizeof(iwe));
2422                         iwe.cmd = IWEVCUSTOM;
2423                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2424                                 "0x%02X", cfg[0]);
2425                         iwe.u.data.length = strlen(buf);
2426                         current_ev = iwe_stream_add_point_check(info,
2427                                                                 current_ev,
2428                                                                 end_buf,
2429                                                                 &iwe, buf);
2430                         if (IS_ERR(current_ev))
2431                                 goto unlock;
2432                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
2433                                 cfg[1]);
2434                         iwe.u.data.length = strlen(buf);
2435                         current_ev = iwe_stream_add_point_check(info,
2436                                                                 current_ev,
2437                                                                 end_buf,
2438                                                                 &iwe, buf);
2439                         if (IS_ERR(current_ev))
2440                                 goto unlock;
2441                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
2442                                 cfg[2]);
2443                         iwe.u.data.length = strlen(buf);
2444                         current_ev = iwe_stream_add_point_check(info,
2445                                                                 current_ev,
2446                                                                 end_buf,
2447                                                                 &iwe, buf);
2448                         if (IS_ERR(current_ev))
2449                                 goto unlock;
2450                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2451                         iwe.u.data.length = strlen(buf);
2452                         current_ev = iwe_stream_add_point_check(info,
2453                                                                 current_ev,
2454                                                                 end_buf,
2455                                                                 &iwe, buf);
2456                         if (IS_ERR(current_ev))
2457                                 goto unlock;
2458                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
2459                         iwe.u.data.length = strlen(buf);
2460                         current_ev = iwe_stream_add_point_check(info,
2461                                                                 current_ev,
2462                                                                 end_buf,
2463                                                                 &iwe, buf);
2464                         if (IS_ERR(current_ev))
2465                                 goto unlock;
2466                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
2467                         iwe.u.data.length = strlen(buf);
2468                         current_ev = iwe_stream_add_point_check(info,
2469                                                                 current_ev,
2470                                                                 end_buf,
2471                                                                 &iwe, buf);
2472                         if (IS_ERR(current_ev))
2473                                 goto unlock;
2474                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2475                         iwe.u.data.length = strlen(buf);
2476                         current_ev = iwe_stream_add_point_check(info,
2477                                                                 current_ev,
2478                                                                 end_buf,
2479                                                                 &iwe, buf);
2480                         if (IS_ERR(current_ev))
2481                                 goto unlock;
2482                         break;
2483                 case WLAN_EID_SUPP_RATES:
2484                 case WLAN_EID_EXT_SUPP_RATES:
2485                         /* display all supported rates in readable format */
2486                         p = current_ev + iwe_stream_lcp_len(info);
2487
2488                         memset(&iwe, 0, sizeof(iwe));
2489                         iwe.cmd = SIOCGIWRATE;
2490                         /* Those two flags are ignored... */
2491                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2492
2493                         for (i = 0; i < ie[1]; i++) {
2494                                 iwe.u.bitrate.value =
2495                                         ((ie[i + 2] & 0x7f) * 500000);
2496                                 tmp = p;
2497                                 p = iwe_stream_add_value(info, current_ev, p,
2498                                                          end_buf, &iwe,
2499                                                          IW_EV_PARAM_LEN);
2500                                 if (p == tmp) {
2501                                         current_ev = ERR_PTR(-E2BIG);
2502                                         goto unlock;
2503                                 }
2504                         }
2505                         current_ev = p;
2506                         break;
2507                 }
2508                 rem -= ie[1] + 2;
2509                 ie += ie[1] + 2;
2510         }
2511
2512         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
2513             ismesh) {
2514                 memset(&iwe, 0, sizeof(iwe));
2515                 iwe.cmd = SIOCGIWMODE;
2516                 if (ismesh)
2517                         iwe.u.mode = IW_MODE_MESH;
2518                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
2519                         iwe.u.mode = IW_MODE_MASTER;
2520                 else
2521                         iwe.u.mode = IW_MODE_ADHOC;
2522                 current_ev = iwe_stream_add_event_check(info, current_ev,
2523                                                         end_buf, &iwe,
2524                                                         IW_EV_UINT_LEN);
2525                 if (IS_ERR(current_ev))
2526                         goto unlock;
2527         }
2528
2529         memset(&iwe, 0, sizeof(iwe));
2530         iwe.cmd = IWEVCUSTOM;
2531         sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
2532         iwe.u.data.length = strlen(buf);
2533         current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2534                                                 &iwe, buf);
2535         if (IS_ERR(current_ev))
2536                 goto unlock;
2537         memset(&iwe, 0, sizeof(iwe));
2538         iwe.cmd = IWEVCUSTOM;
2539         sprintf(buf, " Last beacon: %ums ago",
2540                 elapsed_jiffies_msecs(bss->ts));
2541         iwe.u.data.length = strlen(buf);
2542         current_ev = iwe_stream_add_point_check(info, current_ev,
2543                                                 end_buf, &iwe, buf);
2544         if (IS_ERR(current_ev))
2545                 goto unlock;
2546
2547         current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
2548
2549  unlock:
2550         rcu_read_unlock();
2551         return current_ev;
2552 }
2553
2554
2555 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2556                                   struct iw_request_info *info,
2557                                   char *buf, size_t len)
2558 {
2559         char *current_ev = buf;
2560         char *end_buf = buf + len;
2561         struct cfg80211_internal_bss *bss;
2562         int err = 0;
2563
2564         spin_lock_bh(&rdev->bss_lock);
2565         cfg80211_bss_expire(rdev);
2566
2567         list_for_each_entry(bss, &rdev->bss_list, list) {
2568                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
2569                         err = -E2BIG;
2570                         break;
2571                 }
2572                 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
2573                                            current_ev, end_buf);
2574                 if (IS_ERR(current_ev)) {
2575                         err = PTR_ERR(current_ev);
2576                         break;
2577                 }
2578         }
2579         spin_unlock_bh(&rdev->bss_lock);
2580
2581         if (err)
2582                 return err;
2583         return current_ev - buf;
2584 }
2585
2586
2587 int cfg80211_wext_giwscan(struct net_device *dev,
2588                           struct iw_request_info *info,
2589                           struct iw_point *data, char *extra)
2590 {
2591         struct cfg80211_registered_device *rdev;
2592         int res;
2593
2594         if (!netif_running(dev))
2595                 return -ENETDOWN;
2596
2597         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2598
2599         if (IS_ERR(rdev))
2600                 return PTR_ERR(rdev);
2601
2602         if (rdev->scan_req || rdev->scan_msg)
2603                 return -EAGAIN;
2604
2605         res = ieee80211_scan_results(rdev, info, extra, data->length);
2606         data->length = 0;
2607         if (res >= 0) {
2608                 data->length = res;
2609                 res = 0;
2610         }
2611
2612         return res;
2613 }
2614 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
2615 #endif