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 static bool
1095 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1096                           struct cfg80211_internal_bss *known,
1097                           struct cfg80211_internal_bss *new,
1098                           bool signal_valid)
1099 {
1100         lockdep_assert_held(&rdev->bss_lock);
1101
1102         /* Update IEs */
1103         if (rcu_access_pointer(new->pub.proberesp_ies)) {
1104                 const struct cfg80211_bss_ies *old;
1105
1106                 old = rcu_access_pointer(known->pub.proberesp_ies);
1107
1108                 rcu_assign_pointer(known->pub.proberesp_ies,
1109                                    new->pub.proberesp_ies);
1110                 /* Override possible earlier Beacon frame IEs */
1111                 rcu_assign_pointer(known->pub.ies,
1112                                    new->pub.proberesp_ies);
1113                 if (old)
1114                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1115         } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1116                 const struct cfg80211_bss_ies *old;
1117                 struct cfg80211_internal_bss *bss;
1118
1119                 if (known->pub.hidden_beacon_bss &&
1120                     !list_empty(&known->hidden_list)) {
1121                         const struct cfg80211_bss_ies *f;
1122
1123                         /* The known BSS struct is one of the probe
1124                          * response members of a group, but we're
1125                          * receiving a beacon (beacon_ies in the new
1126                          * bss is used). This can only mean that the
1127                          * AP changed its beacon from not having an
1128                          * SSID to showing it, which is confusing so
1129                          * drop this information.
1130                          */
1131
1132                         f = rcu_access_pointer(new->pub.beacon_ies);
1133                         kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1134                         return false;
1135                 }
1136
1137                 old = rcu_access_pointer(known->pub.beacon_ies);
1138
1139                 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1140
1141                 /* Override IEs if they were from a beacon before */
1142                 if (old == rcu_access_pointer(known->pub.ies))
1143                         rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1144
1145                 /* Assign beacon IEs to all sub entries */
1146                 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1147                         const struct cfg80211_bss_ies *ies;
1148
1149                         ies = rcu_access_pointer(bss->pub.beacon_ies);
1150                         WARN_ON(ies != old);
1151
1152                         rcu_assign_pointer(bss->pub.beacon_ies,
1153                                            new->pub.beacon_ies);
1154                 }
1155
1156                 if (old)
1157                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1158         }
1159
1160         known->pub.beacon_interval = new->pub.beacon_interval;
1161
1162         /* don't update the signal if beacon was heard on
1163          * adjacent channel.
1164          */
1165         if (signal_valid)
1166                 known->pub.signal = new->pub.signal;
1167         known->pub.capability = new->pub.capability;
1168         known->ts = new->ts;
1169         known->ts_boottime = new->ts_boottime;
1170         known->parent_tsf = new->parent_tsf;
1171         known->pub.chains = new->pub.chains;
1172         memcpy(known->pub.chain_signal, new->pub.chain_signal,
1173                IEEE80211_MAX_CHAINS);
1174         ether_addr_copy(known->parent_bssid, new->parent_bssid);
1175         known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1176         known->pub.bssid_index = new->pub.bssid_index;
1177
1178         return true;
1179 }
1180
1181 /* Returned bss is reference counted and must be cleaned up appropriately. */
1182 struct cfg80211_internal_bss *
1183 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1184                     struct cfg80211_internal_bss *tmp,
1185                     bool signal_valid, unsigned long ts)
1186 {
1187         struct cfg80211_internal_bss *found = NULL;
1188
1189         if (WARN_ON(!tmp->pub.channel))
1190                 return NULL;
1191
1192         tmp->ts = ts;
1193
1194         spin_lock_bh(&rdev->bss_lock);
1195
1196         if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1197                 spin_unlock_bh(&rdev->bss_lock);
1198                 return NULL;
1199         }
1200
1201         found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1202
1203         if (found) {
1204                 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1205                         goto drop;
1206         } else {
1207                 struct cfg80211_internal_bss *new;
1208                 struct cfg80211_internal_bss *hidden;
1209                 struct cfg80211_bss_ies *ies;
1210
1211                 /*
1212                  * create a copy -- the "res" variable that is passed in
1213                  * is allocated on the stack since it's not needed in the
1214                  * more common case of an update
1215                  */
1216                 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1217                               GFP_ATOMIC);
1218                 if (!new) {
1219                         ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1220                         if (ies)
1221                                 kfree_rcu(ies, rcu_head);
1222                         ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1223                         if (ies)
1224                                 kfree_rcu(ies, rcu_head);
1225                         goto drop;
1226                 }
1227                 memcpy(new, tmp, sizeof(*new));
1228                 new->refcount = 1;
1229                 INIT_LIST_HEAD(&new->hidden_list);
1230                 INIT_LIST_HEAD(&new->pub.nontrans_list);
1231
1232                 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1233                         hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1234                         if (!hidden)
1235                                 hidden = rb_find_bss(rdev, tmp,
1236                                                      BSS_CMP_HIDE_NUL);
1237                         if (hidden) {
1238                                 new->pub.hidden_beacon_bss = &hidden->pub;
1239                                 list_add(&new->hidden_list,
1240                                          &hidden->hidden_list);
1241                                 hidden->refcount++;
1242                                 rcu_assign_pointer(new->pub.beacon_ies,
1243                                                    hidden->pub.beacon_ies);
1244                         }
1245                 } else {
1246                         /*
1247                          * Ok so we found a beacon, and don't have an entry. If
1248                          * it's a beacon with hidden SSID, we might be in for an
1249                          * expensive search for any probe responses that should
1250                          * be grouped with this beacon for updates ...
1251                          */
1252                         if (!cfg80211_combine_bsses(rdev, new)) {
1253                                 kfree(new);
1254                                 goto drop;
1255                         }
1256                 }
1257
1258                 if (rdev->bss_entries >= bss_entries_limit &&
1259                     !cfg80211_bss_expire_oldest(rdev)) {
1260                         kfree(new);
1261                         goto drop;
1262                 }
1263
1264                 /* This must be before the call to bss_ref_get */
1265                 if (tmp->pub.transmitted_bss) {
1266                         struct cfg80211_internal_bss *pbss =
1267                                 container_of(tmp->pub.transmitted_bss,
1268                                              struct cfg80211_internal_bss,
1269                                              pub);
1270
1271                         new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1272                         bss_ref_get(rdev, pbss);
1273                 }
1274
1275                 list_add_tail(&new->list, &rdev->bss_list);
1276                 rdev->bss_entries++;
1277                 rb_insert_bss(rdev, new);
1278                 found = new;
1279         }
1280
1281         rdev->bss_generation++;
1282         bss_ref_get(rdev, found);
1283         spin_unlock_bh(&rdev->bss_lock);
1284
1285         return found;
1286  drop:
1287         spin_unlock_bh(&rdev->bss_lock);
1288         return NULL;
1289 }
1290
1291 /*
1292  * Update RX channel information based on the available frame payload
1293  * information. This is mainly for the 2.4 GHz band where frames can be received
1294  * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1295  * element to indicate the current (transmitting) channel, but this might also
1296  * be needed on other bands if RX frequency does not match with the actual
1297  * operating channel of a BSS.
1298  */
1299 static struct ieee80211_channel *
1300 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1301                          struct ieee80211_channel *channel,
1302                          enum nl80211_bss_scan_width scan_width)
1303 {
1304         const u8 *tmp;
1305         u32 freq;
1306         int channel_number = -1;
1307         struct ieee80211_channel *alt_channel;
1308
1309         tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1310         if (tmp && tmp[1] == 1) {
1311                 channel_number = tmp[2];
1312         } else {
1313                 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1314                 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1315                         struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1316
1317                         channel_number = htop->primary_chan;
1318                 }
1319         }
1320
1321         if (channel_number < 0) {
1322                 /* No channel information in frame payload */
1323                 return channel;
1324         }
1325
1326         freq = ieee80211_channel_to_frequency(channel_number, channel->band);
1327         alt_channel = ieee80211_get_channel(wiphy, freq);
1328         if (!alt_channel) {
1329                 if (channel->band == NL80211_BAND_2GHZ) {
1330                         /*
1331                          * Better not allow unexpected channels when that could
1332                          * be going beyond the 1-11 range (e.g., discovering
1333                          * BSS on channel 12 when radio is configured for
1334                          * channel 11.
1335                          */
1336                         return NULL;
1337                 }
1338
1339                 /* No match for the payload channel number - ignore it */
1340                 return channel;
1341         }
1342
1343         if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1344             scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1345                 /*
1346                  * Ignore channel number in 5 and 10 MHz channels where there
1347                  * may not be an n:1 or 1:n mapping between frequencies and
1348                  * channel numbers.
1349                  */
1350                 return channel;
1351         }
1352
1353         /*
1354          * Use the channel determined through the payload channel number
1355          * instead of the RX channel reported by the driver.
1356          */
1357         if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1358                 return NULL;
1359         return alt_channel;
1360 }
1361
1362 /* Returned bss is reference counted and must be cleaned up appropriately. */
1363 static struct cfg80211_bss *
1364 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1365                                 struct cfg80211_inform_bss *data,
1366                                 enum cfg80211_bss_frame_type ftype,
1367                                 const u8 *bssid, u64 tsf, u16 capability,
1368                                 u16 beacon_interval, const u8 *ie, size_t ielen,
1369                                 struct cfg80211_non_tx_bss *non_tx_data,
1370                                 gfp_t gfp)
1371 {
1372         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1373         struct cfg80211_bss_ies *ies;
1374         struct ieee80211_channel *channel;
1375         struct cfg80211_internal_bss tmp = {}, *res;
1376         int bss_type;
1377         bool signal_valid;
1378         unsigned long ts;
1379
1380         if (WARN_ON(!wiphy))
1381                 return NULL;
1382
1383         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1384                     (data->signal < 0 || data->signal > 100)))
1385                 return NULL;
1386
1387         channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1388                                            data->scan_width);
1389         if (!channel)
1390                 return NULL;
1391
1392         memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1393         tmp.pub.channel = channel;
1394         tmp.pub.scan_width = data->scan_width;
1395         tmp.pub.signal = data->signal;
1396         tmp.pub.beacon_interval = beacon_interval;
1397         tmp.pub.capability = capability;
1398         tmp.ts_boottime = data->boottime_ns;
1399         if (non_tx_data) {
1400                 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1401                 ts = bss_from_pub(non_tx_data->tx_bss)->ts;
1402                 tmp.pub.bssid_index = non_tx_data->bssid_index;
1403                 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1404         } else {
1405                 ts = jiffies;
1406         }
1407
1408         /*
1409          * If we do not know here whether the IEs are from a Beacon or Probe
1410          * Response frame, we need to pick one of the options and only use it
1411          * with the driver that does not provide the full Beacon/Probe Response
1412          * frame. Use Beacon frame pointer to avoid indicating that this should
1413          * override the IEs pointer should we have received an earlier
1414          * indication of Probe Response data.
1415          */
1416         ies = kzalloc(sizeof(*ies) + ielen, gfp);
1417         if (!ies)
1418                 return NULL;
1419         ies->len = ielen;
1420         ies->tsf = tsf;
1421         ies->from_beacon = false;
1422         memcpy(ies->data, ie, ielen);
1423
1424         switch (ftype) {
1425         case CFG80211_BSS_FTYPE_BEACON:
1426                 ies->from_beacon = true;
1427                 /* fall through */
1428         case CFG80211_BSS_FTYPE_UNKNOWN:
1429                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1430                 break;
1431         case CFG80211_BSS_FTYPE_PRESP:
1432                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1433                 break;
1434         }
1435         rcu_assign_pointer(tmp.pub.ies, ies);
1436
1437         signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1438                 wiphy->max_adj_channel_rssi_comp;
1439         res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
1440         if (!res)
1441                 return NULL;
1442
1443         if (channel->band == NL80211_BAND_60GHZ) {
1444                 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1445                 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1446                     bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1447                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1448         } else {
1449                 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1450                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1451         }
1452
1453         if (non_tx_data) {
1454                 /* this is a nontransmitting bss, we need to add it to
1455                  * transmitting bss' list if it is not there
1456                  */
1457                 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1458                                                &res->pub)) {
1459                         if (__cfg80211_unlink_bss(rdev, res))
1460                                 rdev->bss_generation++;
1461                 }
1462         }
1463
1464         trace_cfg80211_return_bss(&res->pub);
1465         /* cfg80211_bss_update gives us a referenced result */
1466         return &res->pub;
1467 }
1468
1469 static const struct element
1470 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1471                                    const struct element *mbssid_elem,
1472                                    const struct element *sub_elem)
1473 {
1474         const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1475         const struct element *next_mbssid;
1476         const struct element *next_sub;
1477
1478         next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1479                                          mbssid_end,
1480                                          ielen - (mbssid_end - ie));
1481
1482         /*
1483          * If is is not the last subelement in current MBSSID IE or there isn't
1484          * a next MBSSID IE - profile is complete.
1485         */
1486         if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
1487             !next_mbssid)
1488                 return NULL;
1489
1490         /* For any length error, just return NULL */
1491
1492         if (next_mbssid->datalen < 4)
1493                 return NULL;
1494
1495         next_sub = (void *)&next_mbssid->data[1];
1496
1497         if (next_mbssid->data + next_mbssid->datalen <
1498             next_sub->data + next_sub->datalen)
1499                 return NULL;
1500
1501         if (next_sub->id != 0 || next_sub->datalen < 2)
1502                 return NULL;
1503
1504         /*
1505          * Check if the first element in the next sub element is a start
1506          * of a new profile
1507          */
1508         return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
1509                NULL : next_mbssid;
1510 }
1511
1512 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
1513                               const struct element *mbssid_elem,
1514                               const struct element *sub_elem,
1515                               u8 *merged_ie, size_t max_copy_len)
1516 {
1517         size_t copied_len = sub_elem->datalen;
1518         const struct element *next_mbssid;
1519
1520         if (sub_elem->datalen > max_copy_len)
1521                 return 0;
1522
1523         memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
1524
1525         while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
1526                                                                 mbssid_elem,
1527                                                                 sub_elem))) {
1528                 const struct element *next_sub = (void *)&next_mbssid->data[1];
1529
1530                 if (copied_len + next_sub->datalen > max_copy_len)
1531                         break;
1532                 memcpy(merged_ie + copied_len, next_sub->data,
1533                        next_sub->datalen);
1534                 copied_len += next_sub->datalen;
1535         }
1536
1537         return copied_len;
1538 }
1539 EXPORT_SYMBOL(cfg80211_merge_profile);
1540
1541 static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
1542                                        struct cfg80211_inform_bss *data,
1543                                        enum cfg80211_bss_frame_type ftype,
1544                                        const u8 *bssid, u64 tsf,
1545                                        u16 beacon_interval, const u8 *ie,
1546                                        size_t ielen,
1547                                        struct cfg80211_non_tx_bss *non_tx_data,
1548                                        gfp_t gfp)
1549 {
1550         const u8 *mbssid_index_ie;
1551         const struct element *elem, *sub;
1552         size_t new_ie_len;
1553         u8 new_bssid[ETH_ALEN];
1554         u8 *new_ie, *profile;
1555         u64 seen_indices = 0;
1556         u16 capability;
1557         struct cfg80211_bss *bss;
1558
1559         if (!non_tx_data)
1560                 return;
1561         if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1562                 return;
1563         if (!wiphy->support_mbssid)
1564                 return;
1565         if (wiphy->support_only_he_mbssid &&
1566             !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1567                 return;
1568
1569         new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
1570         if (!new_ie)
1571                 return;
1572
1573         profile = kmalloc(ielen, gfp);
1574         if (!profile)
1575                 goto out;
1576
1577         for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
1578                 if (elem->datalen < 4)
1579                         continue;
1580                 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
1581                         u8 profile_len;
1582
1583                         if (sub->id != 0 || sub->datalen < 4) {
1584                                 /* not a valid BSS profile */
1585                                 continue;
1586                         }
1587
1588                         if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
1589                             sub->data[1] != 2) {
1590                                 /* The first element within the Nontransmitted
1591                                  * BSSID Profile is not the Nontransmitted
1592                                  * BSSID Capability element.
1593                                  */
1594                                 continue;
1595                         }
1596
1597                         memset(profile, 0, ielen);
1598                         profile_len = cfg80211_merge_profile(ie, ielen,
1599                                                              elem,
1600                                                              sub,
1601                                                              profile,
1602                                                              ielen);
1603
1604                         /* found a Nontransmitted BSSID Profile */
1605                         mbssid_index_ie = cfg80211_find_ie
1606                                 (WLAN_EID_MULTI_BSSID_IDX,
1607                                  profile, profile_len);
1608                         if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
1609                             mbssid_index_ie[2] == 0 ||
1610                             mbssid_index_ie[2] > 46) {
1611                                 /* No valid Multiple BSSID-Index element */
1612                                 continue;
1613                         }
1614
1615                         if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
1616                                 /* We don't support legacy split of a profile */
1617                                 net_dbg_ratelimited("Partial info for BSSID index %d\n",
1618                                                     mbssid_index_ie[2]);
1619
1620                         seen_indices |= BIT_ULL(mbssid_index_ie[2]);
1621
1622                         non_tx_data->bssid_index = mbssid_index_ie[2];
1623                         non_tx_data->max_bssid_indicator = elem->data[0];
1624
1625                         cfg80211_gen_new_bssid(bssid,
1626                                                non_tx_data->max_bssid_indicator,
1627                                                non_tx_data->bssid_index,
1628                                                new_bssid);
1629                         memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
1630                         new_ie_len = cfg80211_gen_new_ie(ie, ielen,
1631                                                          profile,
1632                                                          profile_len, new_ie,
1633                                                          gfp);
1634                         if (!new_ie_len)
1635                                 continue;
1636
1637                         capability = get_unaligned_le16(profile + 2);
1638                         bss = cfg80211_inform_single_bss_data(wiphy, data,
1639                                                               ftype,
1640                                                               new_bssid, tsf,
1641                                                               capability,
1642                                                               beacon_interval,
1643                                                               new_ie,
1644                                                               new_ie_len,
1645                                                               non_tx_data,
1646                                                               gfp);
1647                         if (!bss)
1648                                 break;
1649                         cfg80211_put_bss(wiphy, bss);
1650                 }
1651         }
1652
1653 out:
1654         kfree(new_ie);
1655         kfree(profile);
1656 }
1657
1658 struct cfg80211_bss *
1659 cfg80211_inform_bss_data(struct wiphy *wiphy,
1660                          struct cfg80211_inform_bss *data,
1661                          enum cfg80211_bss_frame_type ftype,
1662                          const u8 *bssid, u64 tsf, u16 capability,
1663                          u16 beacon_interval, const u8 *ie, size_t ielen,
1664                          gfp_t gfp)
1665 {
1666         struct cfg80211_bss *res;
1667         struct cfg80211_non_tx_bss non_tx_data;
1668
1669         res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
1670                                               capability, beacon_interval, ie,
1671                                               ielen, NULL, gfp);
1672         if (!res)
1673                 return NULL;
1674         non_tx_data.tx_bss = res;
1675         cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
1676                                    beacon_interval, ie, ielen, &non_tx_data,
1677                                    gfp);
1678         return res;
1679 }
1680 EXPORT_SYMBOL(cfg80211_inform_bss_data);
1681
1682 static void
1683 cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
1684                                  struct cfg80211_inform_bss *data,
1685                                  struct ieee80211_mgmt *mgmt, size_t len,
1686                                  struct cfg80211_non_tx_bss *non_tx_data,
1687                                  gfp_t gfp)
1688 {
1689         enum cfg80211_bss_frame_type ftype;
1690         const u8 *ie = mgmt->u.probe_resp.variable;
1691         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1692                                       u.probe_resp.variable);
1693
1694         ftype = ieee80211_is_beacon(mgmt->frame_control) ?
1695                 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
1696
1697         cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
1698                                    le64_to_cpu(mgmt->u.probe_resp.timestamp),
1699                                    le16_to_cpu(mgmt->u.probe_resp.beacon_int),
1700                                    ie, ielen, non_tx_data, gfp);
1701 }
1702
1703 static void
1704 cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
1705                                    struct cfg80211_bss *nontrans_bss,
1706                                    struct ieee80211_mgmt *mgmt, size_t len)
1707 {
1708         u8 *ie, *new_ie, *pos;
1709         const u8 *nontrans_ssid, *trans_ssid, *mbssid;
1710         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1711                                       u.probe_resp.variable);
1712         size_t new_ie_len;
1713         struct cfg80211_bss_ies *new_ies;
1714         const struct cfg80211_bss_ies *old;
1715         u8 cpy_len;
1716
1717         lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
1718
1719         ie = mgmt->u.probe_resp.variable;
1720
1721         new_ie_len = ielen;
1722         trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
1723         if (!trans_ssid)
1724                 return;
1725         new_ie_len -= trans_ssid[1];
1726         mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
1727         /*
1728          * It's not valid to have the MBSSID element before SSID
1729          * ignore if that happens - the code below assumes it is
1730          * after (while copying things inbetween).
1731          */
1732         if (!mbssid || mbssid < trans_ssid)
1733                 return;
1734         new_ie_len -= mbssid[1];
1735
1736         nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
1737         if (!nontrans_ssid)
1738                 return;
1739
1740         new_ie_len += nontrans_ssid[1];
1741
1742         /* generate new ie for nontrans BSS
1743          * 1. replace SSID with nontrans BSS' SSID
1744          * 2. skip MBSSID IE
1745          */
1746         new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
1747         if (!new_ie)
1748                 return;
1749
1750         new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
1751         if (!new_ies)
1752                 goto out_free;
1753
1754         pos = new_ie;
1755
1756         /* copy the nontransmitted SSID */
1757         cpy_len = nontrans_ssid[1] + 2;
1758         memcpy(pos, nontrans_ssid, cpy_len);
1759         pos += cpy_len;
1760         /* copy the IEs between SSID and MBSSID */
1761         cpy_len = trans_ssid[1] + 2;
1762         memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
1763         pos += (mbssid - (trans_ssid + cpy_len));
1764         /* copy the IEs after MBSSID */
1765         cpy_len = mbssid[1] + 2;
1766         memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
1767
1768         /* update ie */
1769         new_ies->len = new_ie_len;
1770         new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1771         new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1772         memcpy(new_ies->data, new_ie, new_ie_len);
1773         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
1774                 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
1775                 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
1776                 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1777                 if (old)
1778                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1779         } else {
1780                 old = rcu_access_pointer(nontrans_bss->beacon_ies);
1781                 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
1782                 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1783                 if (old)
1784                         kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1785         }
1786
1787 out_free:
1788         kfree(new_ie);
1789 }
1790
1791 /* cfg80211_inform_bss_width_frame helper */
1792 static struct cfg80211_bss *
1793 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
1794                                       struct cfg80211_inform_bss *data,
1795                                       struct ieee80211_mgmt *mgmt, size_t len,
1796                                       gfp_t gfp)
1797 {
1798         struct cfg80211_internal_bss tmp = {}, *res;
1799         struct cfg80211_bss_ies *ies;
1800         struct ieee80211_channel *channel;
1801         bool signal_valid;
1802         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1803                                       u.probe_resp.variable);
1804         int bss_type;
1805
1806         BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1807                         offsetof(struct ieee80211_mgmt, u.beacon.variable));
1808
1809         trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
1810
1811         if (WARN_ON(!mgmt))
1812                 return NULL;
1813
1814         if (WARN_ON(!wiphy))
1815                 return NULL;
1816
1817         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1818                     (data->signal < 0 || data->signal > 100)))
1819                 return NULL;
1820
1821         if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1822                 return NULL;
1823
1824         channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1825                                            ielen, data->chan, data->scan_width);
1826         if (!channel)
1827                 return NULL;
1828
1829         ies = kzalloc(sizeof(*ies) + ielen, gfp);
1830         if (!ies)
1831                 return NULL;
1832         ies->len = ielen;
1833         ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1834         ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1835         memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1836
1837         if (ieee80211_is_probe_resp(mgmt->frame_control))
1838                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1839         else
1840                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1841         rcu_assign_pointer(tmp.pub.ies, ies);
1842
1843         memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1844         tmp.pub.channel = channel;
1845         tmp.pub.scan_width = data->scan_width;
1846         tmp.pub.signal = data->signal;
1847         tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1848         tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1849         tmp.ts_boottime = data->boottime_ns;
1850         tmp.parent_tsf = data->parent_tsf;
1851         tmp.pub.chains = data->chains;
1852         memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
1853         ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1854
1855         signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1856                 wiphy->max_adj_channel_rssi_comp;
1857         res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1858                                   jiffies);
1859         if (!res)
1860                 return NULL;
1861
1862         if (channel->band == NL80211_BAND_60GHZ) {
1863                 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1864                 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1865                     bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1866                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1867         } else {
1868                 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1869                         regulatory_hint_found_beacon(wiphy, channel, gfp);
1870         }
1871
1872         trace_cfg80211_return_bss(&res->pub);
1873         /* cfg80211_bss_update gives us a referenced result */
1874         return &res->pub;
1875 }
1876
1877 struct cfg80211_bss *
1878 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1879                                struct cfg80211_inform_bss *data,
1880                                struct ieee80211_mgmt *mgmt, size_t len,
1881                                gfp_t gfp)
1882 {
1883         struct cfg80211_bss *res, *tmp_bss;
1884         const u8 *ie = mgmt->u.probe_resp.variable;
1885         const struct cfg80211_bss_ies *ies1, *ies2;
1886         size_t ielen = len - offsetof(struct ieee80211_mgmt,
1887                                       u.probe_resp.variable);
1888         struct cfg80211_non_tx_bss non_tx_data;
1889
1890         res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
1891                                                     len, gfp);
1892         if (!res || !wiphy->support_mbssid ||
1893             !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1894                 return res;
1895         if (wiphy->support_only_he_mbssid &&
1896             !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1897                 return res;
1898
1899         non_tx_data.tx_bss = res;
1900         /* process each non-transmitting bss */
1901         cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
1902                                          &non_tx_data, gfp);
1903
1904         spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
1905
1906         /* check if the res has other nontransmitting bss which is not
1907          * in MBSSID IE
1908          */
1909         ies1 = rcu_access_pointer(res->ies);
1910
1911         /* go through nontrans_list, if the timestamp of the BSS is
1912          * earlier than the timestamp of the transmitting BSS then
1913          * update it
1914          */
1915         list_for_each_entry(tmp_bss, &res->nontrans_list,
1916                             nontrans_list) {
1917                 ies2 = rcu_access_pointer(tmp_bss->ies);
1918                 if (ies2->tsf < ies1->tsf)
1919                         cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
1920                                                            mgmt, len);
1921         }
1922         spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
1923
1924         return res;
1925 }
1926 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1927
1928 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1929 {
1930         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1931         struct cfg80211_internal_bss *bss;
1932
1933         if (!pub)
1934                 return;
1935
1936         bss = container_of(pub, struct cfg80211_internal_bss, pub);
1937
1938         spin_lock_bh(&rdev->bss_lock);
1939         bss_ref_get(rdev, bss);
1940         spin_unlock_bh(&rdev->bss_lock);
1941 }
1942 EXPORT_SYMBOL(cfg80211_ref_bss);
1943
1944 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1945 {
1946         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1947         struct cfg80211_internal_bss *bss;
1948
1949         if (!pub)
1950                 return;
1951
1952         bss = container_of(pub, struct cfg80211_internal_bss, pub);
1953
1954         spin_lock_bh(&rdev->bss_lock);
1955         bss_ref_put(rdev, bss);
1956         spin_unlock_bh(&rdev->bss_lock);
1957 }
1958 EXPORT_SYMBOL(cfg80211_put_bss);
1959
1960 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1961 {
1962         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1963         struct cfg80211_internal_bss *bss, *tmp1;
1964         struct cfg80211_bss *nontrans_bss, *tmp;
1965
1966         if (WARN_ON(!pub))
1967                 return;
1968
1969         bss = container_of(pub, struct cfg80211_internal_bss, pub);
1970
1971         spin_lock_bh(&rdev->bss_lock);
1972         if (list_empty(&bss->list))
1973                 goto out;
1974
1975         list_for_each_entry_safe(nontrans_bss, tmp,
1976                                  &pub->nontrans_list,
1977                                  nontrans_list) {
1978                 tmp1 = container_of(nontrans_bss,
1979                                     struct cfg80211_internal_bss, pub);
1980                 if (__cfg80211_unlink_bss(rdev, tmp1))
1981                         rdev->bss_generation++;
1982         }
1983
1984         if (__cfg80211_unlink_bss(rdev, bss))
1985                 rdev->bss_generation++;
1986 out:
1987         spin_unlock_bh(&rdev->bss_lock);
1988 }
1989 EXPORT_SYMBOL(cfg80211_unlink_bss);
1990
1991 void cfg80211_bss_iter(struct wiphy *wiphy,
1992                        struct cfg80211_chan_def *chandef,
1993                        void (*iter)(struct wiphy *wiphy,
1994                                     struct cfg80211_bss *bss,
1995                                     void *data),
1996                        void *iter_data)
1997 {
1998         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1999         struct cfg80211_internal_bss *bss;
2000
2001         spin_lock_bh(&rdev->bss_lock);
2002
2003         list_for_each_entry(bss, &rdev->bss_list, list) {
2004                 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
2005                         iter(wiphy, &bss->pub, iter_data);
2006         }
2007
2008         spin_unlock_bh(&rdev->bss_lock);
2009 }
2010 EXPORT_SYMBOL(cfg80211_bss_iter);
2011
2012 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
2013                                      struct ieee80211_channel *chan)
2014 {
2015         struct wiphy *wiphy = wdev->wiphy;
2016         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2017         struct cfg80211_internal_bss *cbss = wdev->current_bss;
2018         struct cfg80211_internal_bss *new = NULL;
2019         struct cfg80211_internal_bss *bss;
2020         struct cfg80211_bss *nontrans_bss;
2021         struct cfg80211_bss *tmp;
2022
2023         spin_lock_bh(&rdev->bss_lock);
2024
2025         if (WARN_ON(cbss->pub.channel == chan))
2026                 goto done;
2027
2028         /* use transmitting bss */
2029         if (cbss->pub.transmitted_bss)
2030                 cbss = container_of(cbss->pub.transmitted_bss,
2031                                     struct cfg80211_internal_bss,
2032                                     pub);
2033
2034         cbss->pub.channel = chan;
2035
2036         list_for_each_entry(bss, &rdev->bss_list, list) {
2037                 if (!cfg80211_bss_type_match(bss->pub.capability,
2038                                              bss->pub.channel->band,
2039                                              wdev->conn_bss_type))
2040                         continue;
2041
2042                 if (bss == cbss)
2043                         continue;
2044
2045                 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2046                         new = bss;
2047                         break;
2048                 }
2049         }
2050
2051         if (new) {
2052                 /* to save time, update IEs for transmitting bss only */
2053                 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2054                         new->pub.proberesp_ies = NULL;
2055                         new->pub.beacon_ies = NULL;
2056                 }
2057
2058                 list_for_each_entry_safe(nontrans_bss, tmp,
2059                                          &new->pub.nontrans_list,
2060                                          nontrans_list) {
2061                         bss = container_of(nontrans_bss,
2062                                            struct cfg80211_internal_bss, pub);
2063                         if (__cfg80211_unlink_bss(rdev, bss))
2064                                 rdev->bss_generation++;
2065                 }
2066
2067                 WARN_ON(atomic_read(&new->hold));
2068                 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2069                         rdev->bss_generation++;
2070         }
2071
2072         rb_erase(&cbss->rbn, &rdev->bss_tree);
2073         rb_insert_bss(rdev, cbss);
2074         rdev->bss_generation++;
2075
2076         list_for_each_entry_safe(nontrans_bss, tmp,
2077                                  &cbss->pub.nontrans_list,
2078                                  nontrans_list) {
2079                 bss = container_of(nontrans_bss,
2080                                    struct cfg80211_internal_bss, pub);
2081                 bss->pub.channel = chan;
2082                 rb_erase(&bss->rbn, &rdev->bss_tree);
2083                 rb_insert_bss(rdev, bss);
2084                 rdev->bss_generation++;
2085         }
2086
2087 done:
2088         spin_unlock_bh(&rdev->bss_lock);
2089 }
2090
2091 #ifdef CONFIG_CFG80211_WEXT
2092 static struct cfg80211_registered_device *
2093 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2094 {
2095         struct cfg80211_registered_device *rdev;
2096         struct net_device *dev;
2097
2098         ASSERT_RTNL();
2099
2100         dev = dev_get_by_index(net, ifindex);
2101         if (!dev)
2102                 return ERR_PTR(-ENODEV);
2103         if (dev->ieee80211_ptr)
2104                 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2105         else
2106                 rdev = ERR_PTR(-ENODEV);
2107         dev_put(dev);
2108         return rdev;
2109 }
2110
2111 int cfg80211_wext_siwscan(struct net_device *dev,
2112                           struct iw_request_info *info,
2113                           union iwreq_data *wrqu, char *extra)
2114 {
2115         struct cfg80211_registered_device *rdev;
2116         struct wiphy *wiphy;
2117         struct iw_scan_req *wreq = NULL;
2118         struct cfg80211_scan_request *creq = NULL;
2119         int i, err, n_channels = 0;
2120         enum nl80211_band band;
2121
2122         if (!netif_running(dev))
2123                 return -ENETDOWN;
2124
2125         if (wrqu->data.length == sizeof(struct iw_scan_req))
2126                 wreq = (struct iw_scan_req *)extra;
2127
2128         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2129
2130         if (IS_ERR(rdev))
2131                 return PTR_ERR(rdev);
2132
2133         if (rdev->scan_req || rdev->scan_msg) {
2134                 err = -EBUSY;
2135                 goto out;
2136         }
2137
2138         wiphy = &rdev->wiphy;
2139
2140         /* Determine number of channels, needed to allocate creq */
2141         if (wreq && wreq->num_channels)
2142                 n_channels = wreq->num_channels;
2143         else
2144                 n_channels = ieee80211_get_num_supported_channels(wiphy);
2145
2146         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2147                        n_channels * sizeof(void *),
2148                        GFP_ATOMIC);
2149         if (!creq) {
2150                 err = -ENOMEM;
2151                 goto out;
2152         }
2153
2154         creq->wiphy = wiphy;
2155         creq->wdev = dev->ieee80211_ptr;
2156         /* SSIDs come after channels */
2157         creq->ssids = (void *)&creq->channels[n_channels];
2158         creq->n_channels = n_channels;
2159         creq->n_ssids = 1;
2160         creq->scan_start = jiffies;
2161
2162         /* translate "Scan on frequencies" request */
2163         i = 0;
2164         for (band = 0; band < NUM_NL80211_BANDS; band++) {
2165                 int j;
2166
2167                 if (!wiphy->bands[band])
2168                         continue;
2169
2170                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2171                         /* ignore disabled channels */
2172                         if (wiphy->bands[band]->channels[j].flags &
2173                                                 IEEE80211_CHAN_DISABLED)
2174                                 continue;
2175
2176                         /* If we have a wireless request structure and the
2177                          * wireless request specifies frequencies, then search
2178                          * for the matching hardware channel.
2179                          */
2180                         if (wreq && wreq->num_channels) {
2181                                 int k;
2182                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2183                                 for (k = 0; k < wreq->num_channels; k++) {
2184                                         struct iw_freq *freq =
2185                                                 &wreq->channel_list[k];
2186                                         int wext_freq =
2187                                                 cfg80211_wext_freq(freq);
2188
2189                                         if (wext_freq == wiphy_freq)
2190                                                 goto wext_freq_found;
2191                                 }
2192                                 goto wext_freq_not_found;
2193                         }
2194
2195                 wext_freq_found:
2196                         creq->channels[i] = &wiphy->bands[band]->channels[j];
2197                         i++;
2198                 wext_freq_not_found: ;
2199                 }
2200         }
2201         /* No channels found? */
2202         if (!i) {
2203                 err = -EINVAL;
2204                 goto out;
2205         }
2206
2207         /* Set real number of channels specified in creq->channels[] */
2208         creq->n_channels = i;
2209
2210         /* translate "Scan for SSID" request */
2211         if (wreq) {
2212                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2213                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2214                                 err = -EINVAL;
2215                                 goto out;
2216                         }
2217                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2218                         creq->ssids[0].ssid_len = wreq->essid_len;
2219                 }
2220                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2221                         creq->n_ssids = 0;
2222         }
2223
2224         for (i = 0; i < NUM_NL80211_BANDS; i++)
2225                 if (wiphy->bands[i])
2226                         creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2227
2228         eth_broadcast_addr(creq->bssid);
2229
2230         rdev->scan_req = creq;
2231         err = rdev_scan(rdev, creq);
2232         if (err) {
2233                 rdev->scan_req = NULL;
2234                 /* creq will be freed below */
2235         } else {
2236                 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2237                 /* creq now owned by driver */
2238                 creq = NULL;
2239                 dev_hold(dev);
2240         }
2241  out:
2242         kfree(creq);
2243         return err;
2244 }
2245 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2246
2247 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2248                                     const struct cfg80211_bss_ies *ies,
2249                                     char *current_ev, char *end_buf)
2250 {
2251         const u8 *pos, *end, *next;
2252         struct iw_event iwe;
2253
2254         if (!ies)
2255                 return current_ev;
2256
2257         /*
2258          * If needed, fragment the IEs buffer (at IE boundaries) into short
2259          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2260          */
2261         pos = ies->data;
2262         end = pos + ies->len;
2263
2264         while (end - pos > IW_GENERIC_IE_MAX) {
2265                 next = pos + 2 + pos[1];
2266                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2267                         next = next + 2 + next[1];
2268
2269                 memset(&iwe, 0, sizeof(iwe));
2270                 iwe.cmd = IWEVGENIE;
2271                 iwe.u.data.length = next - pos;
2272                 current_ev = iwe_stream_add_point_check(info, current_ev,
2273                                                         end_buf, &iwe,
2274                                                         (void *)pos);
2275                 if (IS_ERR(current_ev))
2276                         return current_ev;
2277                 pos = next;
2278         }
2279
2280         if (end > pos) {
2281                 memset(&iwe, 0, sizeof(iwe));
2282                 iwe.cmd = IWEVGENIE;
2283                 iwe.u.data.length = end - pos;
2284                 current_ev = iwe_stream_add_point_check(info, current_ev,
2285                                                         end_buf, &iwe,
2286                                                         (void *)pos);
2287                 if (IS_ERR(current_ev))
2288                         return current_ev;
2289         }
2290
2291         return current_ev;
2292 }
2293
2294 static char *
2295 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2296               struct cfg80211_internal_bss *bss, char *current_ev,
2297               char *end_buf)
2298 {
2299         const struct cfg80211_bss_ies *ies;
2300         struct iw_event iwe;
2301         const u8 *ie;
2302         u8 buf[50];
2303         u8 *cfg, *p, *tmp;
2304         int rem, i, sig;
2305         bool ismesh = false;
2306
2307         memset(&iwe, 0, sizeof(iwe));
2308         iwe.cmd = SIOCGIWAP;
2309         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2310         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2311         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2312                                                 IW_EV_ADDR_LEN);
2313         if (IS_ERR(current_ev))
2314                 return current_ev;
2315
2316         memset(&iwe, 0, sizeof(iwe));
2317         iwe.cmd = SIOCGIWFREQ;
2318         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2319         iwe.u.freq.e = 0;
2320         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2321                                                 IW_EV_FREQ_LEN);
2322         if (IS_ERR(current_ev))
2323                 return current_ev;
2324
2325         memset(&iwe, 0, sizeof(iwe));
2326         iwe.cmd = SIOCGIWFREQ;
2327         iwe.u.freq.m = bss->pub.channel->center_freq;
2328         iwe.u.freq.e = 6;
2329         current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2330                                                 IW_EV_FREQ_LEN);
2331         if (IS_ERR(current_ev))
2332                 return current_ev;
2333
2334         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2335                 memset(&iwe, 0, sizeof(iwe));
2336                 iwe.cmd = IWEVQUAL;
2337                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2338                                      IW_QUAL_NOISE_INVALID |
2339                                      IW_QUAL_QUAL_UPDATED;
2340                 switch (wiphy->signal_type) {
2341                 case CFG80211_SIGNAL_TYPE_MBM:
2342                         sig = bss->pub.signal / 100;
2343                         iwe.u.qual.level = sig;
2344                         iwe.u.qual.updated |= IW_QUAL_DBM;
2345                         if (sig < -110)         /* rather bad */
2346                                 sig = -110;
2347                         else if (sig > -40)     /* perfect */
2348                                 sig = -40;
2349                         /* will give a range of 0 .. 70 */
2350                         iwe.u.qual.qual = sig + 110;
2351                         break;
2352                 case CFG80211_SIGNAL_TYPE_UNSPEC:
2353                         iwe.u.qual.level = bss->pub.signal;
2354                         /* will give range 0 .. 100 */
2355                         iwe.u.qual.qual = bss->pub.signal;
2356                         break;
2357                 default:
2358                         /* not reached */
2359                         break;
2360                 }
2361                 current_ev = iwe_stream_add_event_check(info, current_ev,
2362                                                         end_buf, &iwe,
2363                                                         IW_EV_QUAL_LEN);
2364                 if (IS_ERR(current_ev))
2365                         return current_ev;
2366         }
2367
2368         memset(&iwe, 0, sizeof(iwe));
2369         iwe.cmd = SIOCGIWENCODE;
2370         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2371                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2372         else
2373                 iwe.u.data.flags = IW_ENCODE_DISABLED;
2374         iwe.u.data.length = 0;
2375         current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2376                                                 &iwe, "");
2377         if (IS_ERR(current_ev))
2378                 return current_ev;
2379
2380         rcu_read_lock();
2381         ies = rcu_dereference(bss->pub.ies);
2382         rem = ies->len;
2383         ie = ies->data;
2384
2385         while (rem >= 2) {
2386                 /* invalid data */
2387                 if (ie[1] > rem - 2)
2388                         break;
2389
2390                 switch (ie[0]) {
2391                 case WLAN_EID_SSID:
2392                         memset(&iwe, 0, sizeof(iwe));
2393                         iwe.cmd = SIOCGIWESSID;
2394                         iwe.u.data.length = ie[1];
2395                         iwe.u.data.flags = 1;
2396                         current_ev = iwe_stream_add_point_check(info,
2397                                                                 current_ev,
2398                                                                 end_buf, &iwe,
2399                                                                 (u8 *)ie + 2);
2400                         if (IS_ERR(current_ev))
2401                                 goto unlock;
2402                         break;
2403                 case WLAN_EID_MESH_ID:
2404                         memset(&iwe, 0, sizeof(iwe));
2405                         iwe.cmd = SIOCGIWESSID;
2406                         iwe.u.data.length = ie[1];
2407                         iwe.u.data.flags = 1;
2408                         current_ev = iwe_stream_add_point_check(info,
2409                                                                 current_ev,
2410                                                                 end_buf, &iwe,
2411                                                                 (u8 *)ie + 2);
2412                         if (IS_ERR(current_ev))
2413                                 goto unlock;
2414                         break;
2415                 case WLAN_EID_MESH_CONFIG:
2416                         ismesh = true;
2417                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2418                                 break;
2419                         cfg = (u8 *)ie + 2;
2420                         memset(&iwe, 0, sizeof(iwe));
2421                         iwe.cmd = IWEVCUSTOM;
2422                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2423                                 "0x%02X", cfg[0]);
2424                         iwe.u.data.length = strlen(buf);
2425                         current_ev = iwe_stream_add_point_check(info,
2426                                                                 current_ev,
2427                                                                 end_buf,
2428                                                                 &iwe, buf);
2429                         if (IS_ERR(current_ev))
2430                                 goto unlock;
2431                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
2432                                 cfg[1]);
2433                         iwe.u.data.length = strlen(buf);
2434                         current_ev = iwe_stream_add_point_check(info,
2435                                                                 current_ev,
2436                                                                 end_buf,
2437                                                                 &iwe, buf);
2438                         if (IS_ERR(current_ev))
2439                                 goto unlock;
2440                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
2441                                 cfg[2]);
2442                         iwe.u.data.length = strlen(buf);
2443                         current_ev = iwe_stream_add_point_check(info,
2444                                                                 current_ev,
2445                                                                 end_buf,
2446                                                                 &iwe, buf);
2447                         if (IS_ERR(current_ev))
2448                                 goto unlock;
2449                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2450                         iwe.u.data.length = strlen(buf);
2451                         current_ev = iwe_stream_add_point_check(info,
2452                                                                 current_ev,
2453                                                                 end_buf,
2454                                                                 &iwe, buf);
2455                         if (IS_ERR(current_ev))
2456                                 goto unlock;
2457                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
2458                         iwe.u.data.length = strlen(buf);
2459                         current_ev = iwe_stream_add_point_check(info,
2460                                                                 current_ev,
2461                                                                 end_buf,
2462                                                                 &iwe, buf);
2463                         if (IS_ERR(current_ev))
2464                                 goto unlock;
2465                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
2466                         iwe.u.data.length = strlen(buf);
2467                         current_ev = iwe_stream_add_point_check(info,
2468                                                                 current_ev,
2469                                                                 end_buf,
2470                                                                 &iwe, buf);
2471                         if (IS_ERR(current_ev))
2472                                 goto unlock;
2473                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2474                         iwe.u.data.length = strlen(buf);
2475                         current_ev = iwe_stream_add_point_check(info,
2476                                                                 current_ev,
2477                                                                 end_buf,
2478                                                                 &iwe, buf);
2479                         if (IS_ERR(current_ev))
2480                                 goto unlock;
2481                         break;
2482                 case WLAN_EID_SUPP_RATES:
2483                 case WLAN_EID_EXT_SUPP_RATES:
2484                         /* display all supported rates in readable format */
2485                         p = current_ev + iwe_stream_lcp_len(info);
2486
2487                         memset(&iwe, 0, sizeof(iwe));
2488                         iwe.cmd = SIOCGIWRATE;
2489                         /* Those two flags are ignored... */
2490                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2491
2492                         for (i = 0; i < ie[1]; i++) {
2493                                 iwe.u.bitrate.value =
2494                                         ((ie[i + 2] & 0x7f) * 500000);
2495                                 tmp = p;
2496                                 p = iwe_stream_add_value(info, current_ev, p,
2497                                                          end_buf, &iwe,
2498                                                          IW_EV_PARAM_LEN);
2499                                 if (p == tmp) {
2500                                         current_ev = ERR_PTR(-E2BIG);
2501                                         goto unlock;
2502                                 }
2503                         }
2504                         current_ev = p;
2505                         break;
2506                 }
2507                 rem -= ie[1] + 2;
2508                 ie += ie[1] + 2;
2509         }
2510
2511         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
2512             ismesh) {
2513                 memset(&iwe, 0, sizeof(iwe));
2514                 iwe.cmd = SIOCGIWMODE;
2515                 if (ismesh)
2516                         iwe.u.mode = IW_MODE_MESH;
2517                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
2518                         iwe.u.mode = IW_MODE_MASTER;
2519                 else
2520                         iwe.u.mode = IW_MODE_ADHOC;
2521                 current_ev = iwe_stream_add_event_check(info, current_ev,
2522                                                         end_buf, &iwe,
2523                                                         IW_EV_UINT_LEN);
2524                 if (IS_ERR(current_ev))
2525                         goto unlock;
2526         }
2527
2528         memset(&iwe, 0, sizeof(iwe));
2529         iwe.cmd = IWEVCUSTOM;
2530         sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
2531         iwe.u.data.length = strlen(buf);
2532         current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2533                                                 &iwe, buf);
2534         if (IS_ERR(current_ev))
2535                 goto unlock;
2536         memset(&iwe, 0, sizeof(iwe));
2537         iwe.cmd = IWEVCUSTOM;
2538         sprintf(buf, " Last beacon: %ums ago",
2539                 elapsed_jiffies_msecs(bss->ts));
2540         iwe.u.data.length = strlen(buf);
2541         current_ev = iwe_stream_add_point_check(info, current_ev,
2542                                                 end_buf, &iwe, buf);
2543         if (IS_ERR(current_ev))
2544                 goto unlock;
2545
2546         current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
2547
2548  unlock:
2549         rcu_read_unlock();
2550         return current_ev;
2551 }
2552
2553
2554 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2555                                   struct iw_request_info *info,
2556                                   char *buf, size_t len)
2557 {
2558         char *current_ev = buf;
2559         char *end_buf = buf + len;
2560         struct cfg80211_internal_bss *bss;
2561         int err = 0;
2562
2563         spin_lock_bh(&rdev->bss_lock);
2564         cfg80211_bss_expire(rdev);
2565
2566         list_for_each_entry(bss, &rdev->bss_list, list) {
2567                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
2568                         err = -E2BIG;
2569                         break;
2570                 }
2571                 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
2572                                            current_ev, end_buf);
2573                 if (IS_ERR(current_ev)) {
2574                         err = PTR_ERR(current_ev);
2575                         break;
2576                 }
2577         }
2578         spin_unlock_bh(&rdev->bss_lock);
2579
2580         if (err)
2581                 return err;
2582         return current_ev - buf;
2583 }
2584
2585
2586 int cfg80211_wext_giwscan(struct net_device *dev,
2587                           struct iw_request_info *info,
2588                           struct iw_point *data, char *extra)
2589 {
2590         struct cfg80211_registered_device *rdev;
2591         int res;
2592
2593         if (!netif_running(dev))
2594                 return -ENETDOWN;
2595
2596         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2597
2598         if (IS_ERR(rdev))
2599                 return PTR_ERR(rdev);
2600
2601         if (rdev->scan_req || rdev->scan_msg)
2602                 return -EAGAIN;
2603
2604         res = ieee80211_scan_results(rdev, info, extra, data->length);
2605         data->length = 0;
2606         if (res >= 0) {
2607                 data->length = res;
2608                 res = 0;
2609         }
2610
2611         return res;
2612 }
2613 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
2614 #endif