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         WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
 560
 561         list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list) {
 562                 if (pos->reqid == reqid)
 563                         return pos;
 564         }
 565         return NULL;
 566 }
 567
 568 /*
 569  * Determines if a scheduled scan request can be handled. When a legacy
 570  * scheduled scan is running no other scheduled scan is allowed regardless
 571  * whether the request is for legacy or multi-support scan. When a multi-support
 572  * scheduled scan is running a request for legacy scan is not allowed. In this
 573  * case a request for multi-support scan can be handled if resources are
 574  * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
 575  */
 576 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
 577                                      bool want_multi)
 578 {
 579         struct cfg80211_sched_scan_request *pos;
 580         int i = 0;
 581
 582         list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
 583                 /* request id zero means legacy in progress */
 584                 if (!i && !pos->reqid)
 585                         return -EINPROGRESS;
 586                 i++;
 587         }
 588
 589         if (i) {
 590                 /* no legacy allowed when multi request(s) are active */
 591                 if (!want_multi)
 592                         return -EINPROGRESS;
 593
 594                 /* resource limit reached */
 595                 if (i == rdev->wiphy.max_sched_scan_reqs)
 596                         return -ENOSPC;
 597         }
 598         return 0;
 599 }
 600
 601 void cfg80211_sched_scan_results_wk(struct work_struct *work)
 602 {
 603         struct cfg80211_registered_device *rdev;
 604         struct cfg80211_sched_scan_request *req, *tmp;
 605
 606         rdev = container_of(work, struct cfg80211_registered_device,
 607                            sched_scan_res_wk);
 608
 609         rtnl_lock();
 610         list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
 611                 if (req->report_results) {
 612                         req->report_results = false;
 613                         if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
 614                                 /* flush entries from previous scans */
 615                                 spin_lock_bh(&rdev->bss_lock);
 616                                 __cfg80211_bss_expire(rdev, req->scan_start);
 617                                 spin_unlock_bh(&rdev->bss_lock);
 618                                 req->scan_start = jiffies;
 619                         }
 620                         nl80211_send_sched_scan(req,
 621                                                 NL80211_CMD_SCHED_SCAN_RESULTS);
 622                 }
 623         }
 624         rtnl_unlock();
 625 }
 626
 627 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
 628 {
 629         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 630         struct cfg80211_sched_scan_request *request;
 631
 632         trace_cfg80211_sched_scan_results(wiphy, reqid);
 633         /* ignore if we're not scanning */
 634
 635         rcu_read_lock();
 636         request = cfg80211_find_sched_scan_req(rdev, reqid);
 637         if (request) {
 638                 request->report_results = true;
 639                 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
 640         }
 641         rcu_read_unlock();
 642 }
 643 EXPORT_SYMBOL(cfg80211_sched_scan_results);
 644
 645 void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid)
 646 {
 647         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 648
 649         ASSERT_RTNL();
 650
 651         trace_cfg80211_sched_scan_stopped(wiphy, reqid);
 652
 653         __cfg80211_stop_sched_scan(rdev, reqid, true);
 654 }
 655 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
 656
 657 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
 658 {
 659         rtnl_lock();
 660         cfg80211_sched_scan_stopped_rtnl(wiphy, reqid);
 661         rtnl_unlock();
 662 }
 663 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
 664
 665 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
 666                                  struct cfg80211_sched_scan_request *req,
 667                                  bool driver_initiated)
 668 {
 669         ASSERT_RTNL();
 670
 671         if (!driver_initiated) {
 672                 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
 673                 if (err)
 674                         return err;
 675         }
 676
 677         nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
 678
 679         cfg80211_del_sched_scan_req(rdev, req);
 680
 681         return 0;
 682 }
 683
 684 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
 685                                u64 reqid, bool driver_initiated)
 686 {
 687         struct cfg80211_sched_scan_request *sched_scan_req;
 688
 689         ASSERT_RTNL();
 690
 691         sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
 692         if (!sched_scan_req)
 693                 return -ENOENT;
 694
 695         return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
 696                                             driver_initiated);
 697 }
 698
 699 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
 700                       unsigned long age_secs)
 701 {
 702         struct cfg80211_internal_bss *bss;
 703         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
 704
 705         spin_lock_bh(&rdev->bss_lock);
 706         list_for_each_entry(bss, &rdev->bss_list, list)
 707                 bss->ts -= age_jiffies;
 708         spin_unlock_bh(&rdev->bss_lock);
 709 }
 710
 711 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
 712 {
 713         __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
 714 }
 715
 716 const struct element *
 717 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
 718                          const u8 *match, unsigned int match_len,
 719                          unsigned int match_offset)
 720 {
 721         const struct element *elem;
 722
 723         for_each_element_id(elem, eid, ies, len) {
 724                 if (elem->datalen >= match_offset + match_len &&
 725                     !memcmp(elem->data + match_offset, match, match_len))
 726                         return elem;
 727         }
 728
 729         return NULL;
 730 }
 731 EXPORT_SYMBOL(cfg80211_find_elem_match);
 732
 733 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
 734                                                 const u8 *ies,
 735                                                 unsigned int len)
 736 {
 737         const struct element *elem;
 738         u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
 739         int match_len = (oui_type < 0) ? 3 : sizeof(match);
 740
 741         if (WARN_ON(oui_type > 0xff))
 742                 return NULL;
 743
 744         elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
 745                                         match, match_len, 0);
 746
 747         if (!elem || elem->datalen < 4)
 748                 return NULL;
 749
 750         return elem;
 751 }
 752 EXPORT_SYMBOL(cfg80211_find_vendor_elem);
 753
 754 /**
 755  * enum bss_compare_mode - BSS compare mode
 756  * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
 757  * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
 758  * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
 759  */
 760 enum bss_compare_mode {
 761         BSS_CMP_REGULAR,
 762         BSS_CMP_HIDE_ZLEN,
 763         BSS_CMP_HIDE_NUL,
 764 };
 765
 766 static int cmp_bss(struct cfg80211_bss *a,
 767                    struct cfg80211_bss *b,
 768                    enum bss_compare_mode mode)
 769 {
 770         const struct cfg80211_bss_ies *a_ies, *b_ies;
 771         const u8 *ie1 = NULL;
 772         const u8 *ie2 = NULL;
 773         int i, r;
 774
 775         if (a->channel != b->channel)
 776                 return b->channel->center_freq - a->channel->center_freq;
 777
 778         a_ies = rcu_access_pointer(a->ies);
 779         if (!a_ies)
 780                 return -1;
 781         b_ies = rcu_access_pointer(b->ies);
 782         if (!b_ies)
 783                 return 1;
 784
 785         if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
 786                 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
 787                                        a_ies->data, a_ies->len);
 788         if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
 789                 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
 790                                        b_ies->data, b_ies->len);
 791         if (ie1 && ie2) {
 792                 int mesh_id_cmp;
 793
 794                 if (ie1[1] == ie2[1])
 795                         mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
 796                 else
 797                         mesh_id_cmp = ie2[1] - ie1[1];
 798
 799                 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
 800                                        a_ies->data, a_ies->len);
 801                 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
 802                                        b_ies->data, b_ies->len);
 803                 if (ie1 && ie2) {
 804                         if (mesh_id_cmp)
 805                                 return mesh_id_cmp;
 806                         if (ie1[1] != ie2[1])
 807                                 return ie2[1] - ie1[1];
 808                         return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
 809                 }
 810         }
 811
 812         r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
 813         if (r)
 814                 return r;
 815
 816         ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
 817         ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
 818
 819         if (!ie1 && !ie2)
 820                 return 0;
 821
 822         /*
 823          * Note that with "hide_ssid", the function returns a match if
 824          * the already-present BSS ("b") is a hidden SSID beacon for
 825          * the new BSS ("a").
 826          */
 827
 828         /* sort missing IE before (left of) present IE */
 829         if (!ie1)
 830                 return -1;
 831         if (!ie2)
 832                 return 1;
 833
 834         switch (mode) {
 835         case BSS_CMP_HIDE_ZLEN:
 836                 /*
 837                  * In ZLEN mode we assume the BSS entry we're
 838                  * looking for has a zero-length SSID. So if
 839                  * the one we're looking at right now has that,
 840                  * return 0. Otherwise, return the difference
 841                  * in length, but since we're looking for the
 842                  * 0-length it's really equivalent to returning
 843                  * the length of the one we're looking at.
 844                  *
 845                  * No content comparison is needed as we assume
 846                  * the content length is zero.
 847                  */
 848                 return ie2[1];
 849         case BSS_CMP_REGULAR:
 850         default:
 851                 /* sort by length first, then by contents */
 852                 if (ie1[1] != ie2[1])
 853                         return ie2[1] - ie1[1];
 854                 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
 855         case BSS_CMP_HIDE_NUL:
 856                 if (ie1[1] != ie2[1])
 857                         return ie2[1] - ie1[1];
 858                 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
 859                 for (i = 0; i < ie2[1]; i++)
 860                         if (ie2[i + 2])
 861                                 return -1;
 862                 return 0;
 863         }
 864 }
 865
 866 static bool cfg80211_bss_type_match(u16 capability,
 867                                     enum nl80211_band band,
 868                                     enum ieee80211_bss_type bss_type)
 869 {
 870         bool ret = true;
 871         u16 mask, val;
 872
 873         if (bss_type == IEEE80211_BSS_TYPE_ANY)
 874                 return ret;
 875
 876         if (band == NL80211_BAND_60GHZ) {
 877                 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
 878                 switch (bss_type) {
 879                 case IEEE80211_BSS_TYPE_ESS:
 880                         val = WLAN_CAPABILITY_DMG_TYPE_AP;
 881                         break;
 882                 case IEEE80211_BSS_TYPE_PBSS:
 883                         val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
 884                         break;
 885                 case IEEE80211_BSS_TYPE_IBSS:
 886                         val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
 887                         break;
 888                 default:
 889                         return false;
 890                 }
 891         } else {
 892                 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
 893                 switch (bss_type) {
 894                 case IEEE80211_BSS_TYPE_ESS:
 895                         val = WLAN_CAPABILITY_ESS;
 896                         break;
 897                 case IEEE80211_BSS_TYPE_IBSS:
 898                         val = WLAN_CAPABILITY_IBSS;
 899                         break;
 900                 case IEEE80211_BSS_TYPE_MBSS:
 901                         val = 0;
 902                         break;
 903                 default:
 904                         return false;
 905                 }
 906         }
 907
 908         ret = ((capability & mask) == val);
 909         return ret;
 910 }
 911
 912 /* Returned bss is reference counted and must be cleaned up appropriately. */
 913 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
 914                                       struct ieee80211_channel *channel,
 915                                       const u8 *bssid,
 916                                       const u8 *ssid, size_t ssid_len,
 917                                       enum ieee80211_bss_type bss_type,
 918                                       enum ieee80211_privacy privacy)
 919 {
 920         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 921         struct cfg80211_internal_bss *bss, *res = NULL;
 922         unsigned long now = jiffies;
 923         int bss_privacy;
 924
 925         trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
 926                                privacy);
 927
 928         spin_lock_bh(&rdev->bss_lock);
 929
 930         list_for_each_entry(bss, &rdev->bss_list, list) {
 931                 if (!cfg80211_bss_type_match(bss->pub.capability,
 932                                              bss->pub.channel->band, bss_type))
 933                         continue;
 934
 935                 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
 936                 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
 937                     (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
 938                         continue;
 939                 if (channel && bss->pub.channel != channel)
 940                         continue;
 941                 if (!is_valid_ether_addr(bss->pub.bssid))
 942                         continue;
 943                 /* Don't get expired BSS structs */
 944                 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
 945                     !atomic_read(&bss->hold))
 946                         continue;
 947                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
 948                         res = bss;
 949                         bss_ref_get(rdev, res);
 950                         break;
 951                 }
 952         }
 953
 954         spin_unlock_bh(&rdev->bss_lock);
 955         if (!res)
 956                 return NULL;
 957         trace_cfg80211_return_bss(&res->pub);
 958         return &res->pub;
 959 }
 960 EXPORT_SYMBOL(cfg80211_get_bss);
 961
 962 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
 963                           struct cfg80211_internal_bss *bss)
 964 {
 965         struct rb_node **p = &rdev->bss_tree.rb_node;
 966         struct rb_node *parent = NULL;
 967         struct cfg80211_internal_bss *tbss;
 968         int cmp;
 969
 970         while (*p) {
 971                 parent = *p;
 972                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
 973
 974                 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
 975
 976                 if (WARN_ON(!cmp)) {
 977                         /* will sort of leak this BSS */
 978                         return;
 979                 }
 980
 981                 if (cmp < 0)
 982                         p = &(*p)->rb_left;
 983                 else
 984                         p = &(*p)->rb_right;
 985         }
 986
 987         rb_link_node(&bss->rbn, parent, p);
 988         rb_insert_color(&bss->rbn, &rdev->bss_tree);
 989 }
 990
 991 static struct cfg80211_internal_bss *
 992 rb_find_bss(struct cfg80211_registered_device *rdev,
 993             struct cfg80211_internal_bss *res,
 994             enum bss_compare_mode mode)
 995 {
 996         struct rb_node *n = rdev->bss_tree.rb_node;
 997         struct cfg80211_internal_bss *bss;
 998         int r;
 999
1000         while (n) {
1001                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1002                 r = cmp_bss(&res->pub, &bss->pub, mode);
1003
1004                 if (r == 0)
1005                         return bss;
1006                 else if (r < 0)
1007                         n = n->rb_left;
1008                 else
1009                         n = n->rb_right;
1010         }
1011
1012         return NULL;
1013 }
1014
1015 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1016                                    struct cfg80211_internal_bss *new)
1017 {
1018         const struct cfg80211_bss_ies *ies;
1019         struct cfg80211_internal_bss *bss;
1020         const u8 *ie;
1021         int i, ssidlen;
1022         u8 fold = 0;
1023         u32 n_entries = 0;
1024
1025         ies = rcu_access_pointer(new->pub.beacon_ies);
1026         if (WARN_ON(!ies))
1027                 return false;
1028
1029         ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1030         if (!ie) {
1031                 /* nothing to do */
1032                 return true;
1033         }
1034
1035         ssidlen = ie[1];
1036         for (i = 0; i < ssidlen; i++)
1037                 fold |= ie[2 + i];
1038
1039         if (fold) {
1040                 /* not a hidden SSID */
1041                 return true;
1042         }
1043
1044         /* This is the bad part ... */
1045
1046         list_for_each_entry(bss, &rdev->bss_list, list) {
1047                 /*
1048                  * we're iterating all the entries anyway, so take the
1049                  * opportunity to validate the list length accounting
1050                  */
1051                 n_entries++;
1052
1053                 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1054                         continue;
1055                 if (bss->pub.channel != new->pub.channel)
1056                         continue;
1057                 if (bss->pub.scan_width != new->pub.scan_width)
1058                         continue;
1059                 if (rcu_access_pointer(bss->pub.beacon_ies))
1060                         continue;
1061                 ies = rcu_access_pointer(bss->pub.ies);
1062                 if (!ies)
1063                         continue;
1064                 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1065                 if (!ie)
1066                         continue;
1067                 if (ssidlen && ie[1] != ssidlen)
1068                         continue;
1069                 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1070                         continue;
1071                 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1072                         list_del(&bss->hidden_list);
1073                 /* combine them */
1074                 list_add(&bss->hidden_list, &new->hidden_list);
1075                 bss->pub.hidden_beacon_bss = &new->pub;
1076                 new->refcount += bss->refcount;
1077                 rcu_assign_pointer(bss->pub.beacon_ies,
1078                                    new->pub.beacon_ies);
1079         }
1080
1081         WARN_ONCE(n_entries != rdev->bss_entries,
1082                   "rdev bss entries[%d]/list[len:%d] corruption\n",
1083                   rdev->bss_entries, n_entries);
1084
1085         return true;
1086 }
1087
1088 struct cfg80211_non_tx_bss {
1089         struct cfg80211_bss *tx_bss;
1090         u8 max_bssid_indicator;
1091         u8 bssid_index;
1092 };
1093
1094 /* Returned bss is reference counted and must be cleaned up appropriately. */
1095 struct cfg80211_internal_bss *
1096 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1097                     struct cfg80211_internal_bss *tmp,
1098                     bool signal_valid, unsigned long ts)
1099 {
1100         struct cfg80211_internal_bss *found = NULL;
1101
1102         if (WARN_ON(!tmp->pub.channel))
1103                 return NULL;
1104
1105         tmp->ts = ts;
1106
1107         spin_lock_bh(&rdev->bss_lock);
1108
1109         if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1110                 spin_unlock_bh(&rdev->bss_lock);
1111                 return NULL;
1112         }
1113
1114         found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1115
1116         if (found) {
1117                 /* Update IEs */
1118                 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1119                         const struct cfg80211_bss_ies *old;
1120
1121                         old = rcu_access_pointer(found->pub.proberesp_ies);
1122
1123                         rcu_assign_pointer(found->pub.proberesp_ies,
1124                                            tmp->pub.proberesp_ies);
1125                         /* Override possible earlier Beacon frame IEs */
1126                         rcu_assign_pointer(found->pub.ies,
1127                                            tmp->pub.proberesp_ies);
1128                         if (old)
1129                                 kfree_rcu((struct cfg80211_bss_ies *)old,
1130                                           rcu_head);
1131                 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
1132                         const struct cfg80211_bss_ies *old;
1133                         struct cfg80211_internal_bss *bss;
1134
1135                         if (found->pub.hidden_beacon_bss &&
1136                             !list_empty(&found->hidden_list)) {
1137                                 const struct cfg80211_bss_ies *f;
1138
1139                                 /*
1140                                  * The found BSS struct is one of the probe
1141                                  * response members of a group, but we're
1142                                  * receiving a beacon (beacon_ies in the tmp
1143                                  * bss is used). This can only mean that the
1144                                  * AP changed its beacon from not having an
1145                                  * SSID to showing it, which is confusing so
1146                                  * drop this information.
1147                                  */
1148
1149                                 f = rcu_access_pointer(tmp->pub.beacon_ies);
1150                                 kfree_rcu((struct cfg80211_bss_ies *)f,
1151                                           rcu_head);
1152                                 goto drop;
1153                         }
1154
1155                         old = rcu_access_pointer(found->pub.beacon_ies);
1156
1157                         rcu_assign_pointer(found->pub.beacon_ies,
1158                                            tmp->pub.beacon_ies);
1159
1160                         /* Override IEs if they were from a beacon before */
1161                         if (old == rcu_access_pointer(found->pub.ies))
1162                                 rcu_assign_pointer(found->pub.ies,
1163                                                    tmp->pub.beacon_ies);
1164
1165                         /* Assign beacon IEs to all sub entries */
1166                         list_for_each_entry(bss, &found->hidden_list,
1167                                             hidden_list) {
1168                                 const struct cfg80211_bss_ies *ies;
1169
1170                                 ies = rcu_access_pointer(bss->pub.beacon_ies);
1171                                 WARN_ON(ies != old);
1172
1173                                 rcu_assign_pointer(bss->pub.beacon_ies,
1174                                                    tmp->pub.beacon_ies);
1175                         }
1176
1177                         if (old)
1178                                 kfree_rcu((struct cfg80211_bss_ies *)old,
1179                                           rcu_head);
1180                 }
1181
1182                 found->pub.beacon_interval = tmp->pub.beacon_interval;
1183                 /*
1184                  * don't update the signal if beacon was heard on
1185                  * adjacent channel.
1186                  */
1187                 if (signal_valid)
1188                         found->pub.signal = tmp->pub.signal;
1189                 found->pub.capability = tmp->pub.capability;
1190                 found->ts = tmp->ts;
1191                 found->ts_boottime = tmp->ts_boottime;
1192                 found->parent_tsf = tmp->parent_tsf;
1193                 found->pub.chains = tmp->pub.chains;
1194                 memcpy(found->pub.chain_signal, tmp->pub.chain_signal,
1195                        IEEE80211_MAX_CHAINS);
1196                 ether_addr_copy(found->parent_bssid, tmp->parent_bssid);
1197                 found->pub.max_bssid_indicator = tmp->pub.max_bssid_indicator;
1198                 found->pub.bssid_index = tmp->pub.bssid_index;
1199         } else {
1200                 struct cfg80211_internal_bss *new;
1201                 struct cfg80211_internal_bss *hidden;
1202                 struct cfg80211_bss_ies *ies;
1203
1204                 /*
1205                  * create a copy -- the "res" variable that is passed in
1206                  * is allocated on the stack since it's not needed in the
1207                  * more common case of an update
1208                  */
1209                 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1210                               GFP_ATOMIC);
1211                 if (!new) {
1212                         ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1213                         if (ies)
1214                                 kfree_rcu(ies, rcu_head);
1215                         ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1216                         if (ies)
1217                                 kfree_rcu(ies, rcu_head);
1218                         goto drop;
1219                 }
1220                 memcpy(new, tmp, sizeof(*new));
1221                 new->refcount = 1;
1222                 INIT_LIST_HEAD(&new->hidden_list);
1223                 INIT_LIST_HEAD(&new->pub.nontrans_list);
1224
1225                 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1226                         hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1227                         if (!hidden)
1228                                 hidden = rb_find_bss(rdev, tmp,
1229                                                      BSS_CMP_HIDE_NUL);
1230                         if (hidden) {
1231                                 new->pub.hidden_beacon_bss = &hidden->pub;
1232                                 list_add(&new->hidden_list,
1233                                          &hidden->hidden_list);
1234                                 hidden->refcount++;
1235                                 rcu_assign_pointer(new->pub.beacon_ies,
1236                                                    hidden->pub.beacon_ies);
1237                         }
1238                 } else {
1239                         /*
1240                          * Ok so we found a beacon, and don't have an entry. If
1241                          * it's a beacon with hidden SSID, we might be in for an
1242                          * expensive search for any probe responses that should
1243                          * be grouped with this beacon for updates ...
1244                          */
1245                         if (!cfg80211_combine_bsses(rdev, new)) {
1246                                 kfree(new);
1247                                 goto drop;
1248                         }
1249                 }
1250
1251                 if (rdev->bss_entries >= bss_entries_limit &&
1252                     !cfg80211_bss_expire_oldest(rdev)) {
1253                         kfree(new);
1254                         goto drop;
1255                 }
1256
1257                 /* This must be before the call to bss_ref_get */
1258                 if (tmp->pub.transmitted_bss) {
1259                         struct cfg80211_internal_bss *pbss =
1260                                 container_of(tmp->pub.transmitted_bss,
1261                                              struct cfg80211_internal_bss,
1262                                              pub);
1263
1264                         new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1265                         bss_ref_get(rdev, pbss);
1266                 }
1267
1268                 list_add_tail(&new->list, &rdev->bss_list);
1269                 rdev->bss_entries++;
1270                 rb_insert_bss(rdev, new);
1271                 found = new;
1272         }
1273
1274         rdev->bss_generation++;
1275         bss_ref_get(rdev, found);
1276         spin_unlock_bh(&rdev->bss_lock);
1277
1278         return found;
1279  drop:
1280         spin_unlock_bh(&rdev->bss_lock);
1281         return NULL;
1282 }
1283
1284 /*
1285  * Update RX channel information based on the available frame payload
1286  * information. This is mainly for the 2.4 GHz band where frames can be received
1287  * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1288  * element to indicate the current (transmitting) channel, but this might also
1289  * be needed on other bands if RX frequency does not match with the actual
1290  * operating channel of a BSS.
1291  */
1292 static struct ieee80211_channel *
1293 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1294                          struct ieee80211_channel *channel,
1295                          enum nl80211_bss_scan_width scan_width)
1296 {
1297         const u8 *tmp;
1298         u32 freq;
1299         int channel_number = -1;
1300         struct ieee80211_channel *alt_channel;
1301
1302         tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1303         if (tmp && tmp[1] == 1) {
1304                 channel_number = tmp[2];
1305         } else {
1306                 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1307                 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1308                         struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1309
1310                         channel_number = htop->primary_chan;
1311                 }
1312         }
1313
1314         if (channel_number < 0) {
1315                 /* No channel information in frame payload */
1316                 return channel;
1317         }
1318
1319         freq = ieee80211_channel_to_frequency(channel_number, channel->band);
1320         alt_channel = ieee80211_get_channel(wiphy, freq);
1321         if (!alt_channel) {
1322                 if (channel->band == NL80211_BAND_2GHZ) {
1323                         /*
1324                          * Better not allow unexpected channels when that could
1325                          * be going beyond the 1-11 range (e.g., discovering
1326                          * BSS on channel 12 when radio is configured for
1327                          * channel 11.
1328                          */
1329                         return NULL;
1330                 }
1331
1332                 /* No match for the payload channel number - ignore it */
1333                 return channel;
1334         }
1335
1336         if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1337             scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1338                 /*
1339                  * Ignore channel number in 5 and 10 MHz channels where there
1340                  * may not be an n:1 or 1:n mapping between frequencies and
1341                  * channel numbers.
1342                  */
1343                 return channel;
1344         }
1345
1346         /*
1347          * Use the channel determined through the payload channel number
1348          * instead of the RX channel reported by the driver.
1349          */
1350         if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1351                 return NULL;
1352         return alt_channel;
1353 }
1354
1355 /* Returned bss is reference counted and must be cleaned up appropriately. */
1356 static struct cfg80211_bss *
1357 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1358                                 struct cfg80211_inform_bss *data,
1359                                 enum cfg80211_bss_frame_type ftype,
1360                                 const u8 *bssid, u64 tsf, u16 capability,
1361                                 u16 beacon_interval, const u8 *ie, size_t ielen,
1362                                 struct cfg80211_non_tx_bss *non_tx_data,
1363                                 gfp_t gfp)
1364 {
1365         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1366         struct cfg80211_bss_ies *ies;
1367         struct ieee80211_channel *channel;
1368         struct cfg80211_internal_bss tmp = {}, *res;
1369         int bss_type;
1370         bool signal_valid;
1371
1372         if (WARN_ON(!wiphy))
1373                 return NULL;
1374
1375         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1376                     (data->signal < 0 || data->signal > 100)))
1377                 return NULL;
1378
1379         channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1380                                            data->scan_width);
1381         if (!channel)
1382                 return NULL;
1383
1384         memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1385         tmp.pub.channel = channel;
1386         tmp.pub.scan_width = data->scan_width;
1387         tmp.pub.signal = data->signal;
1388         tmp.pub.beacon_interval = beacon_interval;
1389         tmp.pub.capability = capability;
1390         tmp.ts_boottime = data->boottime_ns;
1391         if (non_tx_data) {
1392                 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1393                 tmp.pub.bssid_index = non_tx_data->bssid_index;
1394                 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1395         }
1396
1397         /*
1398          * If we do not know here whether the IEs are from a Beacon or Probe
1399          * Response frame, we need to pick one of the options and only use it
1400          * with the driver that does not provide the full Beacon/Probe Response
1401          * frame. Use Beacon frame pointer to avoid indicating that this should
1402          * override the IEs pointer should we have received an earlier
1403          * indication of Probe Response data.
1404          */
1405         ies = kzalloc(sizeof(*ies) + ielen, gfp);
1406         if (!ies)
1407                 return NULL;
1408         ies->len = ielen;
1409         ies->tsf = tsf;
1410         ies->from_beacon = false;
1411         memcpy(ies->data, ie, ielen);
1412
1413         switch (ftype) {
1414         case CFG80211_BSS_FTYPE_BEACON:
1415                 ies->from_beacon = true;
1416                 /* fall through */
1417         case CFG80211_BSS_FTYPE_UNKNOWN:
1418                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1419                 break;
1420         case CFG80211_BSS_FTYPE_PRESP:
1421                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1422                 break;
1423         }
1424         rcu_assign_pointer(tmp.pub.ies, ies);
1425
1426         signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1427                 wiphy->max_adj_channel_rssi_comp;
1428         res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1429                                   jiffies);
1430         if (!res)
1431                 return NULL;
1432
1433         if (channel->band == NL80211_BAND_60GHZ) {
1434                 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1435                 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1436                     bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1437                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1438         } else {
1439                 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1440                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1441         }
1442
1443         if (non_tx_data && non_tx_data->tx_bss) {
1444                 /* this is a nontransmitting bss, we need to add it to
1445                  * transmitting bss' list if it is not there
1446                  */
1447                 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1448                                                &res->pub)) {
1449                         if (__cfg80211_unlink_bss(rdev, res))
1450                                 rdev->bss_generation++;
1451                 }
1452         }
1453
1454         trace_cfg80211_return_bss(&res->pub);
1455         /* cfg80211_bss_update gives us a referenced result */
1456         return &res->pub;
1457 }
1458
1459 static const struct element
1460 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1461                                    const struct element *mbssid_elem,
1462                                    const struct element *sub_elem)
1463 {
1464         const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1465         const struct element *next_mbssid;
1466         const struct element *next_sub;
1467
1468         next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1469                                          mbssid_end,
1470                                          ielen - (mbssid_end - ie));
1471
1472         /*
1473          * If is is not the last subelement in current MBSSID IE or there isn't
1474          * a next MBSSID IE - profile is complete.
1475         */
1476         if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
1477             !next_mbssid)
1478                 return NULL;
1479
1480         /* For any length error, just return NULL */
1481
1482         if (next_mbssid->datalen < 4)
1483                 return NULL;
1484
1485         next_sub = (void *)&next_mbssid->data[1];
1486
1487         if (next_mbssid->data + next_mbssid->datalen <
1488             next_sub->data + next_sub->datalen)
1489                 return NULL;
1490
1491         if (next_sub->id != 0 || next_sub->datalen < 2)
1492                 return NULL;
1493
1494         /*
1495          * Check if the first element in the next sub element is a start
1496          * of a new profile
1497          */
1498         return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
1499                NULL : next_mbssid;
1500 }
1501
1502 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
1503                               const struct element *mbssid_elem,
1504                               const struct element *sub_elem,
1505                               u8 *merged_ie, size_t max_copy_len)
1506 {
1507         size_t copied_len = sub_elem->datalen;
1508         const struct element *next_mbssid;
1509
1510         if (sub_elem->datalen > max_copy_len)
1511                 return 0;
1512
1513         memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
1514
1515         while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
1516                                                                 mbssid_elem,
1517                                                                 sub_elem))) {
1518                 const struct element *next_sub = (void *)&next_mbssid->data[1];
1519
1520                 if (copied_len + next_sub->datalen > max_copy_len)
1521                         break;
1522                 memcpy(merged_ie + copied_len, next_sub->data,
1523                        next_sub->datalen);
1524                 copied_len += next_sub->datalen;
1525         }
1526
1527         return copied_len;
1528 }
1529 EXPORT_SYMBOL(cfg80211_merge_profile);
1530
1531 static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
1532                                        struct cfg80211_inform_bss *data,
1533                                        enum cfg80211_bss_frame_type ftype,
1534                                        const u8 *bssid, u64 tsf,
1535                                        u16 beacon_interval, const u8 *ie,
1536                                        size_t ielen,
1537                                        struct cfg80211_non_tx_bss *non_tx_data,
1538                                        gfp_t gfp)
1539 {
1540         const u8 *mbssid_index_ie;
1541         const struct element *elem, *sub;
1542         size_t new_ie_len;
1543         u8 new_bssid[ETH_ALEN];
1544         u8 *new_ie, *profile;
1545         u64 seen_indices = 0;
1546         u16 capability;
1547         struct cfg80211_bss *bss;
1548
1549         if (!non_tx_data)
1550                 return;
1551         if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1552                 return;
1553         if (!wiphy->support_mbssid)
1554                 return;
1555         if (wiphy->support_only_he_mbssid &&
1556             !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1557                 return;
1558
1559         new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
1560         if (!new_ie)
1561                 return;
1562
1563         profile = kmalloc(ielen, gfp);
1564         if (!profile)
1565                 goto out;
1566
1567         for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
1568                 if (elem->datalen < 4)
1569                         continue;
1570                 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
1571                         u8 profile_len;
1572
1573                         if (sub->id != 0 || sub->datalen < 4) {
1574                                 /* not a valid BSS profile */
1575                                 continue;
1576                         }
1577
1578                         if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
1579                             sub->data[1] != 2) {
1580                                 /* The first element within the Nontransmitted
1581                                  * BSSID Profile is not the Nontransmitted
1582                                  * BSSID Capability element.
1583                                  */
1584                                 continue;
1585                         }
1586
1587                         memset(profile, 0, ielen);
1588                         profile_len = cfg80211_merge_profile(ie, ielen,
1589                                                              elem,
1590                                                              sub,
1591                                                              profile,
1592                                                              ielen);
1593
1594                         /* found a Nontransmitted BSSID Profile */
1595                         mbssid_index_ie = cfg80211_find_ie
1596                                 (WLAN_EID_MULTI_BSSID_IDX,
1597                                  profile, profile_len);
1598                         if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
1599                             mbssid_index_ie[2] == 0 ||
1600                             mbssid_index_ie[2] > 46) {
1601                                 /* No valid Multiple BSSID-Index element */
1602                                 continue;
1603                         }
1604
1605                         if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
1606                                 /* We don't support legacy split of a profile */
1607                                 net_dbg_ratelimited("Partial info for BSSID index %d\n",
1608                                                     mbssid_index_ie[2]);
1609
1610                         seen_indices |= BIT_ULL(mbssid_index_ie[2]);
1611
1612                         non_tx_data->bssid_index = mbssid_index_ie[2];
1613                         non_tx_data->max_bssid_indicator = elem->data[0];
1614
1615                         cfg80211_gen_new_bssid(bssid,
1616                                                non_tx_data->max_bssid_indicator,
1617                                                non_tx_data->bssid_index,
1618                                                new_bssid);
1619                         memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
1620                         new_ie_len = cfg80211_gen_new_ie(ie, ielen,
1621                                                          profile,
1622                                                          profile_len, new_ie,
1623                                                          gfp);
1624                         if (!new_ie_len)
1625                                 continue;
1626
1627                         capability = get_unaligned_le16(profile + 2);
1628                         bss = cfg80211_inform_single_bss_data(wiphy, data,
1629                                                               ftype,
1630                                                               new_bssid, tsf,
1631                                                               capability,
1632                                                               beacon_interval,
1633                                                               new_ie,
1634                                                               new_ie_len,
1635                                                               non_tx_data,
1636                                                               gfp);
1637                         if (!bss)
1638                                 break;
1639                         cfg80211_put_bss(wiphy, bss);
1640                 }
1641         }
1642
1643 out:
1644         kfree(new_ie);
1645         kfree(profile);
1646 }
1647
1648 struct cfg80211_bss *
1649 cfg80211_inform_bss_data(struct wiphy *wiphy,
1650                          struct cfg80211_inform_bss *data,
1651                          enum cfg80211_bss_frame_type ftype,
1652                          const u8 *bssid, u64 tsf, u16 capability,
1653                          u16 beacon_interval, const u8 *ie, size_t ielen,
1654                          gfp_t gfp)
1655 {
1656         struct cfg80211_bss *res;
1657         struct cfg80211_non_tx_bss non_tx_data;
1658
1659         res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
1660                                               capability, beacon_interval, ie,
1661                                               ielen, NULL, gfp);
1662         non_tx_data.tx_bss = res;
1663         cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
1664                                    beacon_interval, ie, ielen, &non_tx_data,
1665                                    gfp);
1666         return res;
1667 }
1668 EXPORT_SYMBOL(cfg80211_inform_bss_data);
1669
1670 static void
1671 cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
1672                                  struct cfg80211_inform_bss *data,
1673                                  struct ieee80211_mgmt *mgmt, size_t len,
1674                                  struct cfg80211_non_tx_bss *non_tx_data,
1675                                  gfp_t gfp)
1676 {
1677         enum cfg80211_bss_frame_type ftype;
1678         const u8 *ie = mgmt->u.probe_resp.variable;
1679         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1680                                       u.probe_resp.variable);
1681
1682         ftype = ieee80211_is_beacon(mgmt->frame_control) ?
1683                 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
1684
1685         cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
1686                                    le64_to_cpu(mgmt->u.probe_resp.timestamp),
1687                                    le16_to_cpu(mgmt->u.probe_resp.beacon_int),
1688                                    ie, ielen, non_tx_data, gfp);
1689 }
1690
1691 static void
1692 cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
1693                                    struct cfg80211_bss *nontrans_bss,
1694                                    struct ieee80211_mgmt *mgmt, size_t len,
1695                                    gfp_t gfp)
1696 {
1697         u8 *ie, *new_ie, *pos;
1698         const u8 *nontrans_ssid, *trans_ssid, *mbssid;
1699         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1700                                       u.probe_resp.variable);
1701         size_t new_ie_len;
1702         struct cfg80211_bss_ies *new_ies;
1703         const struct cfg80211_bss_ies *old;
1704         u8 cpy_len;
1705
1706         ie = mgmt->u.probe_resp.variable;
1707
1708         new_ie_len = ielen;
1709         trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
1710         if (!trans_ssid)
1711                 return;
1712         new_ie_len -= trans_ssid[1];
1713         mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
1714         if (!mbssid)
1715                 return;
1716         new_ie_len -= mbssid[1];
1717         rcu_read_lock();
1718         nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
1719         if (!nontrans_ssid) {
1720                 rcu_read_unlock();
1721                 return;
1722         }
1723         new_ie_len += nontrans_ssid[1];
1724         rcu_read_unlock();
1725
1726         /* generate new ie for nontrans BSS
1727          * 1. replace SSID with nontrans BSS' SSID
1728          * 2. skip MBSSID IE
1729          */
1730         new_ie = kzalloc(new_ie_len, gfp);
1731         if (!new_ie)
1732                 return;
1733         new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, gfp);
1734         if (!new_ies)
1735                 goto out_free;
1736
1737         pos = new_ie;
1738
1739         /* copy the nontransmitted SSID */
1740         cpy_len = nontrans_ssid[1] + 2;
1741         memcpy(pos, nontrans_ssid, cpy_len);
1742         pos += cpy_len;
1743         /* copy the IEs between SSID and MBSSID */
1744         cpy_len = trans_ssid[1] + 2;
1745         memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
1746         pos += (mbssid - (trans_ssid + cpy_len));
1747         /* copy the IEs after MBSSID */
1748         cpy_len = mbssid[1] + 2;
1749         memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
1750
1751         /* update ie */
1752         new_ies->len = new_ie_len;
1753         new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1754         new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1755         memcpy(new_ies->data, new_ie, new_ie_len);
1756         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
1757                 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
1758                 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
1759                 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1760                 if (old)
1761                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1762         } else {
1763                 old = rcu_access_pointer(nontrans_bss->beacon_ies);
1764                 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
1765                 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1766                 if (old)
1767                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1768         }
1769
1770 out_free:
1771         kfree(new_ie);
1772 }
1773
1774 /* cfg80211_inform_bss_width_frame helper */
1775 static struct cfg80211_bss *
1776 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
1777                                       struct cfg80211_inform_bss *data,
1778                                       struct ieee80211_mgmt *mgmt, size_t len,
1779                                       struct cfg80211_non_tx_bss *non_tx_data,
1780                                       gfp_t gfp)
1781 {
1782         struct cfg80211_internal_bss tmp = {}, *res;
1783         struct cfg80211_bss_ies *ies;
1784         struct ieee80211_channel *channel;
1785         bool signal_valid;
1786         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1787                                       u.probe_resp.variable);
1788         int bss_type;
1789
1790         BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1791                         offsetof(struct ieee80211_mgmt, u.beacon.variable));
1792
1793         trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
1794
1795         if (WARN_ON(!mgmt))
1796                 return NULL;
1797
1798         if (WARN_ON(!wiphy))
1799                 return NULL;
1800
1801         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1802                     (data->signal < 0 || data->signal > 100)))
1803                 return NULL;
1804
1805         if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1806                 return NULL;
1807
1808         channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1809                                            ielen, data->chan, data->scan_width);
1810         if (!channel)
1811                 return NULL;
1812
1813         ies = kzalloc(sizeof(*ies) + ielen, gfp);
1814         if (!ies)
1815                 return NULL;
1816         ies->len = ielen;
1817         ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1818         ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1819         memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1820
1821         if (ieee80211_is_probe_resp(mgmt->frame_control))
1822                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1823         else
1824                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1825         rcu_assign_pointer(tmp.pub.ies, ies);
1826
1827         memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1828         tmp.pub.channel = channel;
1829         tmp.pub.scan_width = data->scan_width;
1830         tmp.pub.signal = data->signal;
1831         tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1832         tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1833         tmp.ts_boottime = data->boottime_ns;
1834         tmp.parent_tsf = data->parent_tsf;
1835         tmp.pub.chains = data->chains;
1836         memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
1837         ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1838         if (non_tx_data) {
1839                 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1840                 tmp.pub.bssid_index = non_tx_data->bssid_index;
1841                 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1842         }
1843
1844         signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1845                 wiphy->max_adj_channel_rssi_comp;
1846         res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1847                                   jiffies);
1848         if (!res)
1849                 return NULL;
1850
1851         if (channel->band == NL80211_BAND_60GHZ) {
1852                 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1853                 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1854                     bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1855                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1856         } else {
1857                 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1858                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1859         }
1860
1861         trace_cfg80211_return_bss(&res->pub);
1862         /* cfg80211_bss_update gives us a referenced result */
1863         return &res->pub;
1864 }
1865
1866 struct cfg80211_bss *
1867 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1868                                struct cfg80211_inform_bss *data,
1869                                struct ieee80211_mgmt *mgmt, size_t len,
1870                                gfp_t gfp)
1871 {
1872         struct cfg80211_bss *res, *tmp_bss;
1873         const u8 *ie = mgmt->u.probe_resp.variable;
1874         const struct cfg80211_bss_ies *ies1, *ies2;
1875         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1876                                       u.probe_resp.variable);
1877         struct cfg80211_non_tx_bss non_tx_data;
1878
1879         res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
1880                                                     len, NULL, gfp);
1881         if (!res || !wiphy->support_mbssid ||
1882             !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1883                 return res;
1884         if (wiphy->support_only_he_mbssid &&
1885             !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1886                 return res;
1887
1888         non_tx_data.tx_bss = res;
1889         /* process each non-transmitting bss */
1890         cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
1891                                          &non_tx_data, gfp);
1892
1893         /* check if the res has other nontransmitting bss which is not
1894          * in MBSSID IE
1895          */
1896         ies1 = rcu_access_pointer(res->ies);
1897
1898         /* go through nontrans_list, if the timestamp of the BSS is
1899          * earlier than the timestamp of the transmitting BSS then
1900          * update it
1901          */
1902         list_for_each_entry(tmp_bss, &res->nontrans_list,
1903                             nontrans_list) {
1904                 ies2 = rcu_access_pointer(tmp_bss->ies);
1905                 if (ies2->tsf < ies1->tsf)
1906                         cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
1907                                                            mgmt, len, gfp);
1908         }
1909
1910         return res;
1911 }
1912 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1913
1914 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1915 {
1916         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1917         struct cfg80211_internal_bss *bss;
1918
1919         if (!pub)
1920                 return;
1921
1922         bss = container_of(pub, struct cfg80211_internal_bss, pub);
1923
1924         spin_lock_bh(&rdev->bss_lock);
1925         bss_ref_get(rdev, bss);
1926         spin_unlock_bh(&rdev->bss_lock);
1927 }
1928 EXPORT_SYMBOL(cfg80211_ref_bss);
1929
1930 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1931 {
1932         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1933         struct cfg80211_internal_bss *bss;
1934
1935         if (!pub)
1936                 return;
1937
1938         bss = container_of(pub, struct cfg80211_internal_bss, pub);
1939
1940         spin_lock_bh(&rdev->bss_lock);
1941         bss_ref_put(rdev, bss);
1942         spin_unlock_bh(&rdev->bss_lock);
1943 }
1944 EXPORT_SYMBOL(cfg80211_put_bss);
1945
1946 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1947 {
1948         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1949         struct cfg80211_internal_bss *bss, *tmp1;
1950         struct cfg80211_bss *nontrans_bss, *tmp;
1951
1952         if (WARN_ON(!pub))
1953                 return;
1954
1955         bss = container_of(pub, struct cfg80211_internal_bss, pub);
1956
1957         spin_lock_bh(&rdev->bss_lock);
1958         if (list_empty(&bss->list))
1959                 goto out;
1960
1961         list_for_each_entry_safe(nontrans_bss, tmp,
1962                                  &pub->nontrans_list,
1963                                  nontrans_list) {
1964                 tmp1 = container_of(nontrans_bss,
1965                                     struct cfg80211_internal_bss, pub);
1966                 if (__cfg80211_unlink_bss(rdev, tmp1))
1967                         rdev->bss_generation++;
1968         }
1969
1970         if (__cfg80211_unlink_bss(rdev, bss))
1971                 rdev->bss_generation++;
1972 out:
1973         spin_unlock_bh(&rdev->bss_lock);
1974 }
1975 EXPORT_SYMBOL(cfg80211_unlink_bss);
1976
1977 void cfg80211_bss_iter(struct wiphy *wiphy,
1978                        struct cfg80211_chan_def *chandef,
1979                        void (*iter)(struct wiphy *wiphy,
1980                                     struct cfg80211_bss *bss,
1981                                     void *data),
1982                        void *iter_data)
1983 {
1984         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1985         struct cfg80211_internal_bss *bss;
1986
1987         spin_lock_bh(&rdev->bss_lock);
1988
1989         list_for_each_entry(bss, &rdev->bss_list, list) {
1990                 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
1991                         iter(wiphy, &bss->pub, iter_data);
1992         }
1993
1994         spin_unlock_bh(&rdev->bss_lock);
1995 }
1996 EXPORT_SYMBOL(cfg80211_bss_iter);
1997
1998 #ifdef CONFIG_CFG80211_WEXT
1999 static struct cfg80211_registered_device *
2000 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2001 {
2002         struct cfg80211_registered_device *rdev;
2003         struct net_device *dev;
2004
2005         ASSERT_RTNL();
2006
2007         dev = dev_get_by_index(net, ifindex);
2008         if (!dev)
2009                 return ERR_PTR(-ENODEV);
2010         if (dev->ieee80211_ptr)
2011                 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2012         else
2013                 rdev = ERR_PTR(-ENODEV);
2014         dev_put(dev);
2015         return rdev;
2016 }
2017
2018 int cfg80211_wext_siwscan(struct net_device *dev,
2019                           struct iw_request_info *info,
2020                           union iwreq_data *wrqu, char *extra)
2021 {
2022         struct cfg80211_registered_device *rdev;
2023         struct wiphy *wiphy;
2024         struct iw_scan_req *wreq = NULL;
2025         struct cfg80211_scan_request *creq = NULL;
2026         int i, err, n_channels = 0;
2027         enum nl80211_band band;
2028
2029         if (!netif_running(dev))
2030                 return -ENETDOWN;
2031
2032         if (wrqu->data.length == sizeof(struct iw_scan_req))
2033                 wreq = (struct iw_scan_req *)extra;
2034
2035         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2036
2037         if (IS_ERR(rdev))
2038                 return PTR_ERR(rdev);
2039
2040         if (rdev->scan_req || rdev->scan_msg) {
2041                 err = -EBUSY;
2042                 goto out;
2043         }
2044
2045         wiphy = &rdev->wiphy;
2046
2047         /* Determine number of channels, needed to allocate creq */
2048         if (wreq && wreq->num_channels)
2049                 n_channels = wreq->num_channels;
2050         else
2051                 n_channels = ieee80211_get_num_supported_channels(wiphy);
2052
2053         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2054                        n_channels * sizeof(void *),
2055                        GFP_ATOMIC);
2056         if (!creq) {
2057                 err = -ENOMEM;
2058                 goto out;
2059         }
2060
2061         creq->wiphy = wiphy;
2062         creq->wdev = dev->ieee80211_ptr;
2063         /* SSIDs come after channels */
2064         creq->ssids = (void *)&creq->channels[n_channels];
2065         creq->n_channels = n_channels;
2066         creq->n_ssids = 1;
2067         creq->scan_start = jiffies;
2068
2069         /* translate "Scan on frequencies" request */
2070         i = 0;
2071         for (band = 0; band < NUM_NL80211_BANDS; band++) {
2072                 int j;
2073
2074                 if (!wiphy->bands[band])
2075                         continue;
2076
2077                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2078                         /* ignore disabled channels */
2079                         if (wiphy->bands[band]->channels[j].flags &
2080                                                 IEEE80211_CHAN_DISABLED)
2081                                 continue;
2082
2083                         /* If we have a wireless request structure and the
2084                          * wireless request specifies frequencies, then search
2085                          * for the matching hardware channel.
2086                          */
2087                         if (wreq && wreq->num_channels) {
2088                                 int k;
2089                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2090                                 for (k = 0; k < wreq->num_channels; k++) {
2091                                         struct iw_freq *freq =
2092                                                 &wreq->channel_list[k];
2093                                         int wext_freq =
2094                                                 cfg80211_wext_freq(freq);
2095
2096                                         if (wext_freq == wiphy_freq)
2097                                                 goto wext_freq_found;
2098                                 }
2099                                 goto wext_freq_not_found;
2100                         }
2101
2102                 wext_freq_found:
2103                         creq->channels[i] = &wiphy->bands[band]->channels[j];
2104                         i++;
2105                 wext_freq_not_found: ;
2106                 }
2107         }
2108         /* No channels found? */
2109         if (!i) {
2110                 err = -EINVAL;
2111                 goto out;
2112         }
2113
2114         /* Set real number of channels specified in creq->channels[] */
2115         creq->n_channels = i;
2116
2117         /* translate "Scan for SSID" request */
2118         if (wreq) {
2119                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2120                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2121                                 err = -EINVAL;
2122                                 goto out;
2123                         }
2124                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2125                         creq->ssids[0].ssid_len = wreq->essid_len;
2126                 }
2127                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2128                         creq->n_ssids = 0;
2129         }
2130
2131         for (i = 0; i < NUM_NL80211_BANDS; i++)
2132                 if (wiphy->bands[i])
2133                         creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2134
2135         eth_broadcast_addr(creq->bssid);
2136
2137         rdev->scan_req = creq;
2138         err = rdev_scan(rdev, creq);
2139         if (err) {
2140                 rdev->scan_req = NULL;
2141                 /* creq will be freed below */
2142         } else {
2143                 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2144                 /* creq now owned by driver */
2145                 creq = NULL;
2146                 dev_hold(dev);
2147         }
2148  out:
2149         kfree(creq);
2150         return err;
2151 }
2152 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2153
2154 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2155                                     const struct cfg80211_bss_ies *ies,
2156                                     char *current_ev, char *end_buf)
2157 {
2158         const u8 *pos, *end, *next;
2159         struct iw_event iwe;
2160
2161         if (!ies)
2162                 return current_ev;
2163
2164         /*
2165          * If needed, fragment the IEs buffer (at IE boundaries) into short
2166          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2167          */
2168         pos = ies->data;
2169         end = pos + ies->len;
2170
2171         while (end - pos > IW_GENERIC_IE_MAX) {
2172                 next = pos + 2 + pos[1];
2173                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2174                         next = next + 2 + next[1];
2175
2176                 memset(&iwe, 0, sizeof(iwe));
2177                 iwe.cmd = IWEVGENIE;
2178                 iwe.u.data.length = next - pos;
2179                 current_ev = iwe_stream_add_point_check(info, current_ev,
2180                                                         end_buf, &iwe,
2181                                                         (void *)pos);
2182                 if (IS_ERR(current_ev))
2183                         return current_ev;
2184                 pos = next;
2185         }
2186
2187         if (end > pos) {
2188                 memset(&iwe, 0, sizeof(iwe));
2189                 iwe.cmd = IWEVGENIE;
2190                 iwe.u.data.length = end - pos;
2191                 current_ev = iwe_stream_add_point_check(info, current_ev,
2192                                                         end_buf, &iwe,
2193                                                         (void *)pos);
2194                 if (IS_ERR(current_ev))
2195                         return current_ev;
2196         }
2197
2198         return current_ev;
2199 }
2200
2201 static char *
2202 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2203               struct cfg80211_internal_bss *bss, char *current_ev,
2204               char *end_buf)
2205 {
2206         const struct cfg80211_bss_ies *ies;
2207         struct iw_event iwe;
2208         const u8 *ie;
2209         u8 buf[50];
2210         u8 *cfg, *p, *tmp;
2211         int rem, i, sig;
2212         bool ismesh = false;
2213
2214         memset(&iwe, 0, sizeof(iwe));
2215         iwe.cmd = SIOCGIWAP;
2216         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2217         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2218         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2219                                                 IW_EV_ADDR_LEN);
2220         if (IS_ERR(current_ev))
2221                 return current_ev;
2222
2223         memset(&iwe, 0, sizeof(iwe));
2224         iwe.cmd = SIOCGIWFREQ;
2225         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2226         iwe.u.freq.e = 0;
2227         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2228                                                 IW_EV_FREQ_LEN);
2229         if (IS_ERR(current_ev))
2230                 return current_ev;
2231
2232         memset(&iwe, 0, sizeof(iwe));
2233         iwe.cmd = SIOCGIWFREQ;
2234         iwe.u.freq.m = bss->pub.channel->center_freq;
2235         iwe.u.freq.e = 6;
2236         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2237                                                 IW_EV_FREQ_LEN);
2238         if (IS_ERR(current_ev))
2239                 return current_ev;
2240
2241         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2242                 memset(&iwe, 0, sizeof(iwe));
2243                 iwe.cmd = IWEVQUAL;
2244                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2245                                      IW_QUAL_NOISE_INVALID |
2246                                      IW_QUAL_QUAL_UPDATED;
2247                 switch (wiphy->signal_type) {
2248                 case CFG80211_SIGNAL_TYPE_MBM:
2249                         sig = bss->pub.signal / 100;
2250                         iwe.u.qual.level = sig;
2251                         iwe.u.qual.updated |= IW_QUAL_DBM;
2252                         if (sig < -110)         /* rather bad */
2253                                 sig = -110;
2254                         else if (sig > -40)     /* perfect */
2255                                 sig = -40;
2256                         /* will give a range of 0 .. 70 */
2257                         iwe.u.qual.qual = sig + 110;
2258                         break;
2259                 case CFG80211_SIGNAL_TYPE_UNSPEC:
2260                         iwe.u.qual.level = bss->pub.signal;
2261                         /* will give range 0 .. 100 */
2262                         iwe.u.qual.qual = bss->pub.signal;
2263                         break;
2264                 default:
2265                         /* not reached */
2266                         break;
2267                 }
2268                 current_ev = iwe_stream_add_event_check(info, current_ev,
2269                                                         end_buf, &iwe,
2270                                                         IW_EV_QUAL_LEN);
2271                 if (IS_ERR(current_ev))
2272                         return current_ev;
2273         }
2274
2275         memset(&iwe, 0, sizeof(iwe));
2276         iwe.cmd = SIOCGIWENCODE;
2277         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2278                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2279         else
2280                 iwe.u.data.flags = IW_ENCODE_DISABLED;
2281         iwe.u.data.length = 0;
2282         current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2283                                                 &iwe, "");
2284         if (IS_ERR(current_ev))
2285                 return current_ev;
2286
2287         rcu_read_lock();
2288         ies = rcu_dereference(bss->pub.ies);
2289         rem = ies->len;
2290         ie = ies->data;
2291
2292         while (rem >= 2) {
2293                 /* invalid data */
2294                 if (ie[1] > rem - 2)
2295                         break;
2296
2297                 switch (ie[0]) {
2298                 case WLAN_EID_SSID:
2299                         memset(&iwe, 0, sizeof(iwe));
2300                         iwe.cmd = SIOCGIWESSID;
2301                         iwe.u.data.length = ie[1];
2302                         iwe.u.data.flags = 1;
2303                         current_ev = iwe_stream_add_point_check(info,
2304                                                                 current_ev,
2305                                                                 end_buf, &iwe,
2306                                                                 (u8 *)ie + 2);
2307                         if (IS_ERR(current_ev))
2308                                 goto unlock;
2309                         break;
2310                 case WLAN_EID_MESH_ID:
2311                         memset(&iwe, 0, sizeof(iwe));
2312                         iwe.cmd = SIOCGIWESSID;
2313                         iwe.u.data.length = ie[1];
2314                         iwe.u.data.flags = 1;
2315                         current_ev = iwe_stream_add_point_check(info,
2316                                                                 current_ev,
2317                                                                 end_buf, &iwe,
2318                                                                 (u8 *)ie + 2);
2319                         if (IS_ERR(current_ev))
2320                                 goto unlock;
2321                         break;
2322                 case WLAN_EID_MESH_CONFIG:
2323                         ismesh = true;
2324                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2325                                 break;
2326                         cfg = (u8 *)ie + 2;
2327                         memset(&iwe, 0, sizeof(iwe));
2328                         iwe.cmd = IWEVCUSTOM;
2329                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2330                                 "0x%02X", cfg[0]);
2331                         iwe.u.data.length = strlen(buf);
2332                         current_ev = iwe_stream_add_point_check(info,
2333                                                                 current_ev,
2334                                                                 end_buf,
2335                                                                 &iwe, buf);
2336                         if (IS_ERR(current_ev))
2337                                 goto unlock;
2338                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
2339                                 cfg[1]);
2340                         iwe.u.data.length = strlen(buf);
2341                         current_ev = iwe_stream_add_point_check(info,
2342                                                                 current_ev,
2343                                                                 end_buf,
2344                                                                 &iwe, buf);
2345                         if (IS_ERR(current_ev))
2346                                 goto unlock;
2347                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
2348                                 cfg[2]);
2349                         iwe.u.data.length = strlen(buf);
2350                         current_ev = iwe_stream_add_point_check(info,
2351                                                                 current_ev,
2352                                                                 end_buf,
2353                                                                 &iwe, buf);
2354                         if (IS_ERR(current_ev))
2355                                 goto unlock;
2356                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2357                         iwe.u.data.length = strlen(buf);
2358                         current_ev = iwe_stream_add_point_check(info,
2359                                                                 current_ev,
2360                                                                 end_buf,
2361                                                                 &iwe, buf);
2362                         if (IS_ERR(current_ev))
2363                                 goto unlock;
2364                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
2365                         iwe.u.data.length = strlen(buf);
2366                         current_ev = iwe_stream_add_point_check(info,
2367                                                                 current_ev,
2368                                                                 end_buf,
2369                                                                 &iwe, buf);
2370                         if (IS_ERR(current_ev))
2371                                 goto unlock;
2372                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
2373                         iwe.u.data.length = strlen(buf);
2374                         current_ev = iwe_stream_add_point_check(info,
2375                                                                 current_ev,
2376                                                                 end_buf,
2377                                                                 &iwe, buf);
2378                         if (IS_ERR(current_ev))
2379                                 goto unlock;
2380                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2381                         iwe.u.data.length = strlen(buf);
2382                         current_ev = iwe_stream_add_point_check(info,
2383                                                                 current_ev,
2384                                                                 end_buf,
2385                                                                 &iwe, buf);
2386                         if (IS_ERR(current_ev))
2387                                 goto unlock;
2388                         break;
2389                 case WLAN_EID_SUPP_RATES:
2390                 case WLAN_EID_EXT_SUPP_RATES:
2391                         /* display all supported rates in readable format */
2392                         p = current_ev + iwe_stream_lcp_len(info);
2393
2394                         memset(&iwe, 0, sizeof(iwe));
2395                         iwe.cmd = SIOCGIWRATE;
2396                         /* Those two flags are ignored... */
2397                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2398
2399                         for (i = 0; i < ie[1]; i++) {
2400                                 iwe.u.bitrate.value =
2401                                         ((ie[i + 2] & 0x7f) * 500000);
2402                                 tmp = p;
2403                                 p = iwe_stream_add_value(info, current_ev, p,
2404                                                          end_buf, &iwe,
2405                                                          IW_EV_PARAM_LEN);
2406                                 if (p == tmp) {
2407                                         current_ev = ERR_PTR(-E2BIG);
2408                                         goto unlock;
2409                                 }
2410                         }
2411                         current_ev = p;
2412                         break;
2413                 }
2414                 rem -= ie[1] + 2;
2415                 ie += ie[1] + 2;
2416         }
2417
2418         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
2419             ismesh) {
2420                 memset(&iwe, 0, sizeof(iwe));
2421                 iwe.cmd = SIOCGIWMODE;
2422                 if (ismesh)
2423                         iwe.u.mode = IW_MODE_MESH;
2424                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
2425                         iwe.u.mode = IW_MODE_MASTER;
2426                 else
2427                         iwe.u.mode = IW_MODE_ADHOC;
2428                 current_ev = iwe_stream_add_event_check(info, current_ev,
2429                                                         end_buf, &iwe,
2430                                                         IW_EV_UINT_LEN);
2431                 if (IS_ERR(current_ev))
2432                         goto unlock;
2433         }
2434
2435         memset(&iwe, 0, sizeof(iwe));
2436         iwe.cmd = IWEVCUSTOM;
2437         sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
2438         iwe.u.data.length = strlen(buf);
2439         current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2440                                                 &iwe, buf);
2441         if (IS_ERR(current_ev))
2442                 goto unlock;
2443         memset(&iwe, 0, sizeof(iwe));
2444         iwe.cmd = IWEVCUSTOM;
2445         sprintf(buf, " Last beacon: %ums ago",
2446                 elapsed_jiffies_msecs(bss->ts));
2447         iwe.u.data.length = strlen(buf);
2448         current_ev = iwe_stream_add_point_check(info, current_ev,
2449                                                 end_buf, &iwe, buf);
2450         if (IS_ERR(current_ev))
2451                 goto unlock;
2452
2453         current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
2454
2455  unlock:
2456         rcu_read_unlock();
2457         return current_ev;
2458 }
2459
2460
2461 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2462                                   struct iw_request_info *info,
2463                                   char *buf, size_t len)
2464 {
2465         char *current_ev = buf;
2466         char *end_buf = buf + len;
2467         struct cfg80211_internal_bss *bss;
2468         int err = 0;
2469
2470         spin_lock_bh(&rdev->bss_lock);
2471         cfg80211_bss_expire(rdev);
2472
2473         list_for_each_entry(bss, &rdev->bss_list, list) {
2474                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
2475                         err = -E2BIG;
2476                         break;
2477                 }
2478                 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
2479                                            current_ev, end_buf);
2480                 if (IS_ERR(current_ev)) {
2481                         err = PTR_ERR(current_ev);
2482                         break;
2483                 }
2484         }
2485         spin_unlock_bh(&rdev->bss_lock);
2486
2487         if (err)
2488                 return err;
2489         return current_ev - buf;
2490 }
2491
2492
2493 int cfg80211_wext_giwscan(struct net_device *dev,
2494                           struct iw_request_info *info,
2495                           struct iw_point *data, char *extra)
2496 {
2497         struct cfg80211_registered_device *rdev;
2498         int res;
2499
2500         if (!netif_running(dev))
2501                 return -ENETDOWN;
2502
2503         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2504
2505         if (IS_ERR(rdev))
2506                 return PTR_ERR(rdev);
2507
2508         if (rdev->scan_req || rdev->scan_msg)
2509                 return -EAGAIN;
2510
2511         res = ieee80211_scan_results(rdev, info, extra, data->length);
2512         data->length = 0;
2513         if (res >= 0) {
2514                 data->length = res;
2515                 res = 0;
2516         }
2517
2518         return res;
2519 }
2520 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
2521 #endif