net/wireless/scan.c

   1 /*
   2  * cfg80211 scan result handling
   3  *
   4  * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
   5  */
   6 #include <linux/kernel.h>
   7 #include <linux/slab.h>
   8 #include <linux/module.h>
   9 #include <linux/netdevice.h>
  10 #include <linux/wireless.h>
  11 #include <linux/nl80211.h>
  12 #include <linux/etherdevice.h>
  13 #include <net/arp.h>
  14 #include <net/cfg80211.h>
  15 #include <net/cfg80211-wext.h>
  16 #include <net/iw_handler.h>
  17 #include "core.h"
  18 #include "nl80211.h"
  19 #include "wext-compat.h"
  20 #include "rdev-ops.h"
  21
  22 #define IEEE80211_SCAN_RESULT_EXPIRE    (30 * HZ)
  23
  24 static void bss_release(struct kref *ref)
  25 {
  26         struct cfg80211_bss_ies *ies;
  27         struct cfg80211_internal_bss *bss;
  28
  29         bss = container_of(ref, struct cfg80211_internal_bss, ref);
  30
  31         if (WARN_ON(atomic_read(&bss->hold)))
  32                 return;
  33
  34         if (bss->pub.free_priv)
  35                 bss->pub.free_priv(&bss->pub);
  36
  37         ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
  38         if (ies)
  39                 kfree_rcu(ies, rcu_head);
  40         ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
  41         if (ies)
  42                 kfree_rcu(ies, rcu_head);
  43
  44         kfree(bss);
  45 }
  46
  47 /* must hold dev->bss_lock! */
  48 static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
  49                                   struct cfg80211_internal_bss *bss)
  50 {
  51         list_del_init(&bss->list);
  52         rb_erase(&bss->rbn, &dev->bss_tree);
  53         kref_put(&bss->ref, bss_release);
  54 }
  55
  56 /* must hold dev->bss_lock! */
  57 static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev,
  58                                   unsigned long expire_time)
  59 {
  60         struct cfg80211_internal_bss *bss, *tmp;
  61         bool expired = false;
  62
  63         list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
  64                 if (atomic_read(&bss->hold))
  65                         continue;
  66                 if (!time_after(expire_time, bss->ts))
  67                         continue;
  68
  69                 __cfg80211_unlink_bss(dev, bss);
  70                 expired = true;
  71         }
  72
  73         if (expired)
  74                 dev->bss_generation++;
  75 }
  76
  77 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
  78 {
  79         struct cfg80211_scan_request *request;
  80         struct wireless_dev *wdev;
  81 #ifdef CONFIG_CFG80211_WEXT
  82         union iwreq_data wrqu;
  83 #endif
  84
  85         ASSERT_RDEV_LOCK(rdev);
  86
  87         request = rdev->scan_req;
  88
  89         if (!request)
  90                 return;
  91
  92         wdev = request->wdev;
  93
  94         /*
  95          * This must be before sending the other events!
  96          * Otherwise, wpa_supplicant gets completely confused with
  97          * wext events.
  98          */
  99         if (wdev->netdev)
 100                 cfg80211_sme_scan_done(wdev->netdev);
 101
 102         if (request->aborted) {
 103                 nl80211_send_scan_aborted(rdev, wdev);
 104         } else {
 105                 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
 106                         /* flush entries from previous scans */
 107                         spin_lock_bh(&rdev->bss_lock);
 108                         __cfg80211_bss_expire(rdev, request->scan_start);
 109                         spin_unlock_bh(&rdev->bss_lock);
 110                 }
 111                 nl80211_send_scan_done(rdev, wdev);
 112         }
 113
 114 #ifdef CONFIG_CFG80211_WEXT
 115         if (wdev->netdev && !request->aborted) {
 116                 memset(&wrqu, 0, sizeof(wrqu));
 117
 118                 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
 119         }
 120 #endif
 121
 122         if (wdev->netdev)
 123                 dev_put(wdev->netdev);
 124
 125         rdev->scan_req = NULL;
 126
 127         /*
 128          * OK. If this is invoked with "leak" then we can't
 129          * free this ... but we've cleaned it up anyway. The
 130          * driver failed to call the scan_done callback, so
 131          * all bets are off, it might still be trying to use
 132          * the scan request or not ... if it accesses the dev
 133          * in there (it shouldn't anyway) then it may crash.
 134          */
 135         if (!leak)
 136                 kfree(request);
 137 }
 138
 139 void __cfg80211_scan_done(struct work_struct *wk)
 140 {
 141         struct cfg80211_registered_device *rdev;
 142
 143         rdev = container_of(wk, struct cfg80211_registered_device,
 144                             scan_done_wk);
 145
 146         cfg80211_lock_rdev(rdev);
 147         ___cfg80211_scan_done(rdev, false);
 148         cfg80211_unlock_rdev(rdev);
 149 }
 150
 151 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
 152 {
 153         trace_cfg80211_scan_done(request, aborted);
 154         WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
 155
 156         request->aborted = aborted;
 157         queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
 158 }
 159 EXPORT_SYMBOL(cfg80211_scan_done);
 160
 161 void __cfg80211_sched_scan_results(struct work_struct *wk)
 162 {
 163         struct cfg80211_registered_device *rdev;
 164         struct cfg80211_sched_scan_request *request;
 165
 166         rdev = container_of(wk, struct cfg80211_registered_device,
 167                             sched_scan_results_wk);
 168
 169         request = rdev->sched_scan_req;
 170
 171         mutex_lock(&rdev->sched_scan_mtx);
 172
 173         /* we don't have sched_scan_req anymore if the scan is stopping */
 174         if (request) {
 175                 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
 176                         /* flush entries from previous scans */
 177                         spin_lock_bh(&rdev->bss_lock);
 178                         __cfg80211_bss_expire(rdev, request->scan_start);
 179                         spin_unlock_bh(&rdev->bss_lock);
 180                         request->scan_start =
 181                                 jiffies + msecs_to_jiffies(request->interval);
 182                 }
 183                 nl80211_send_sched_scan_results(rdev, request->dev);
 184         }
 185
 186         mutex_unlock(&rdev->sched_scan_mtx);
 187 }
 188
 189 void cfg80211_sched_scan_results(struct wiphy *wiphy)
 190 {
 191         trace_cfg80211_sched_scan_results(wiphy);
 192         /* ignore if we're not scanning */
 193         if (wiphy_to_dev(wiphy)->sched_scan_req)
 194                 queue_work(cfg80211_wq,
 195                            &wiphy_to_dev(wiphy)->sched_scan_results_wk);
 196 }
 197 EXPORT_SYMBOL(cfg80211_sched_scan_results);
 198
 199 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
 200 {
 201         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
 202
 203         trace_cfg80211_sched_scan_stopped(wiphy);
 204
 205         mutex_lock(&rdev->sched_scan_mtx);
 206         __cfg80211_stop_sched_scan(rdev, true);
 207         mutex_unlock(&rdev->sched_scan_mtx);
 208 }
 209 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
 210
 211 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
 212                                bool driver_initiated)
 213 {
 214         struct net_device *dev;
 215
 216         lockdep_assert_held(&rdev->sched_scan_mtx);
 217
 218         if (!rdev->sched_scan_req)
 219                 return -ENOENT;
 220
 221         dev = rdev->sched_scan_req->dev;
 222
 223         if (!driver_initiated) {
 224                 int err = rdev_sched_scan_stop(rdev, dev);
 225                 if (err)
 226                         return err;
 227         }
 228
 229         nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
 230
 231         kfree(rdev->sched_scan_req);
 232         rdev->sched_scan_req = NULL;
 233
 234         return 0;
 235 }
 236
 237 /* must hold dev->bss_lock! */
 238 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 239                       unsigned long age_secs)
 240 {
 241         struct cfg80211_internal_bss *bss;
 242         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
 243
 244         list_for_each_entry(bss, &dev->bss_list, list)
 245                 bss->ts -= age_jiffies;
 246 }
 247
 248 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
 249 {
 250         __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
 251 }
 252
 253 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
 254 {
 255         while (len > 2 && ies[0] != eid) {
 256                 len -= ies[1] + 2;
 257                 ies += ies[1] + 2;
 258         }
 259         if (len < 2)
 260                 return NULL;
 261         if (len < 2 + ies[1])
 262                 return NULL;
 263         return ies;
 264 }
 265 EXPORT_SYMBOL(cfg80211_find_ie);
 266
 267 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
 268                                   const u8 *ies, int len)
 269 {
 270         struct ieee80211_vendor_ie *ie;
 271         const u8 *pos = ies, *end = ies + len;
 272         int ie_oui;
 273
 274         while (pos < end) {
 275                 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
 276                                        end - pos);
 277                 if (!pos)
 278                         return NULL;
 279
 280                 if (end - pos < sizeof(*ie))
 281                         return NULL;
 282
 283                 ie = (struct ieee80211_vendor_ie *)pos;
 284                 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
 285                 if (ie_oui == oui && ie->oui_type == oui_type)
 286                         return pos;
 287
 288                 pos += 2 + ie->len;
 289         }
 290         return NULL;
 291 }
 292 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
 293
 294 static int cmp_ies(u8 num, const u8 *ies1, int len1, const u8 *ies2, int len2)
 295 {
 296         const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
 297         const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
 298
 299         /* equal if both missing */
 300         if (!ie1 && !ie2)
 301                 return 0;
 302         /* sort missing IE before (left of) present IE */
 303         if (!ie1)
 304                 return -1;
 305         if (!ie2)
 306                 return 1;
 307
 308         /* sort by length first, then by contents */
 309         if (ie1[1] != ie2[1])
 310                 return ie2[1] - ie1[1];
 311         return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
 312 }
 313
 314 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
 315                    const u8 *ssid, size_t ssid_len)
 316 {
 317         const struct cfg80211_bss_ies *ies;
 318         const u8 *ssidie;
 319
 320         if (bssid && !ether_addr_equal(a->bssid, bssid))
 321                 return false;
 322
 323         if (!ssid)
 324                 return true;
 325
 326         ies = rcu_access_pointer(a->ies);
 327         if (!ies)
 328                 return false;
 329         ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
 330         if (!ssidie)
 331                 return false;
 332         if (ssidie[1] != ssid_len)
 333                 return false;
 334         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
 335 }
 336
 337 static bool is_mesh_bss(struct cfg80211_bss *a)
 338 {
 339         const struct cfg80211_bss_ies *ies;
 340         const u8 *ie;
 341
 342         if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
 343                 return false;
 344
 345         ies = rcu_access_pointer(a->ies);
 346         if (!ies)
 347                 return false;
 348
 349         ie = cfg80211_find_ie(WLAN_EID_MESH_ID, ies->data, ies->len);
 350         if (!ie)
 351                 return false;
 352
 353         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, ies->data, ies->len);
 354         if (!ie)
 355                 return false;
 356
 357         return true;
 358 }
 359
 360 static bool is_mesh(struct cfg80211_bss *a,
 361                     const u8 *meshid, size_t meshidlen,
 362                     const u8 *meshcfg)
 363 {
 364         const struct cfg80211_bss_ies *ies;
 365         const u8 *ie;
 366
 367         if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
 368                 return false;
 369
 370         ies = rcu_access_pointer(a->ies);
 371         if (!ies)
 372                 return false;
 373
 374         ie = cfg80211_find_ie(WLAN_EID_MESH_ID, ies->data, ies->len);
 375         if (!ie)
 376                 return false;
 377         if (ie[1] != meshidlen)
 378                 return false;
 379         if (memcmp(ie + 2, meshid, meshidlen))
 380                 return false;
 381
 382         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, ies->data, ies->len);
 383         if (!ie)
 384                 return false;
 385         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
 386                 return false;
 387
 388         /*
 389          * Ignore mesh capability (last two bytes of the IE) when
 390          * comparing since that may differ between stations taking
 391          * part in the same mesh.
 392          */
 393         return memcmp(ie + 2, meshcfg,
 394                       sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
 395 }
 396
 397 static int cmp_bss_core(struct cfg80211_bss *a, struct cfg80211_bss *b)
 398 {
 399         const struct cfg80211_bss_ies *a_ies, *b_ies;
 400         int r;
 401
 402         if (a->channel != b->channel)
 403                 return b->channel->center_freq - a->channel->center_freq;
 404
 405         if (is_mesh_bss(a) && is_mesh_bss(b)) {
 406                 a_ies = rcu_access_pointer(a->ies);
 407                 if (!a_ies)
 408                         return -1;
 409                 b_ies = rcu_access_pointer(b->ies);
 410                 if (!b_ies)
 411                         return 1;
 412
 413                 r = cmp_ies(WLAN_EID_MESH_ID,
 414                             a_ies->data, a_ies->len,
 415                             b_ies->data, b_ies->len);
 416                 if (r)
 417                         return r;
 418                 return cmp_ies(WLAN_EID_MESH_CONFIG,
 419                                a_ies->data, a_ies->len,
 420                                b_ies->data, b_ies->len);
 421         }
 422
 423         /*
 424          * we can't use compare_ether_addr here since we need a < > operator.
 425          * The binary return value of compare_ether_addr isn't enough
 426          */
 427         return memcmp(a->bssid, b->bssid, sizeof(a->bssid));
 428 }
 429
 430 static int cmp_bss(struct cfg80211_bss *a,
 431                    struct cfg80211_bss *b)
 432 {
 433         const struct cfg80211_bss_ies *a_ies, *b_ies;
 434         int r;
 435
 436         r = cmp_bss_core(a, b);
 437         if (r)
 438                 return r;
 439
 440         a_ies = rcu_access_pointer(a->ies);
 441         if (!a_ies)
 442                 return -1;
 443         b_ies = rcu_access_pointer(b->ies);
 444         if (!b_ies)
 445                 return 1;
 446
 447         return cmp_ies(WLAN_EID_SSID,
 448                        a_ies->data, a_ies->len,
 449                        b_ies->data, b_ies->len);
 450 }
 451
 452 static int cmp_hidden_bss(struct cfg80211_bss *a, struct cfg80211_bss *b)
 453 {
 454         const struct cfg80211_bss_ies *a_ies, *b_ies;
 455         const u8 *ie1;
 456         const u8 *ie2;
 457         int i;
 458         int r;
 459
 460         r = cmp_bss_core(a, b);
 461         if (r)
 462                 return r;
 463
 464         a_ies = rcu_access_pointer(a->ies);
 465         if (!a_ies)
 466                 return -1;
 467         b_ies = rcu_access_pointer(b->ies);
 468         if (!b_ies)
 469                 return 1;
 470
 471         ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
 472         ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
 473
 474         /*
 475          * Key comparator must use same algorithm in any rb-tree
 476          * search function (order is important), otherwise ordering
 477          * of items in the tree is broken and search gives incorrect
 478          * results. This code uses same order as cmp_ies() does.
 479          *
 480          * Note that due to the differring behaviour with hidden SSIDs
 481          * this function only works when "b" is the tree element and
 482          * "a" is the key we're looking for.
 483          */
 484
 485         /* sort missing IE before (left of) present IE */
 486         if (!ie1)
 487                 return -1;
 488         if (!ie2)
 489                 return 1;
 490
 491         /* zero-size SSID is used as an indication of the hidden bss */
 492         if (!ie2[1])
 493                 return 0;
 494
 495         /* sort by length first, then by contents */
 496         if (ie1[1] != ie2[1])
 497                 return ie2[1] - ie1[1];
 498
 499         /*
 500          * zeroed SSID ie is another indication of a hidden bss;
 501          * if it isn't zeroed just return the regular sort value
 502          * to find the next candidate
 503          */
 504         for (i = 0; i < ie2[1]; i++)
 505                 if (ie2[i + 2])
 506                         return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
 507
 508         return 0;
 509 }
 510
 511 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
 512                                       struct ieee80211_channel *channel,
 513                                       const u8 *bssid,
 514                                       const u8 *ssid, size_t ssid_len,
 515                                       u16 capa_mask, u16 capa_val)
 516 {
 517         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 518         struct cfg80211_internal_bss *bss, *res = NULL;
 519         unsigned long now = jiffies;
 520
 521         trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask,
 522                                capa_val);
 523
 524         spin_lock_bh(&dev->bss_lock);
 525
 526         list_for_each_entry(bss, &dev->bss_list, list) {
 527                 if ((bss->pub.capability & capa_mask) != capa_val)
 528                         continue;
 529                 if (channel && bss->pub.channel != channel)
 530                         continue;
 531                 /* Don't get expired BSS structs */
 532                 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
 533                     !atomic_read(&bss->hold))
 534                         continue;
 535                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
 536                         res = bss;
 537                         kref_get(&res->ref);
 538                         break;
 539                 }
 540         }
 541
 542         spin_unlock_bh(&dev->bss_lock);
 543         if (!res)
 544                 return NULL;
 545         trace_cfg80211_return_bss(&res->pub);
 546         return &res->pub;
 547 }
 548 EXPORT_SYMBOL(cfg80211_get_bss);
 549
 550 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
 551                                        struct ieee80211_channel *channel,
 552                                        const u8 *meshid, size_t meshidlen,
 553                                        const u8 *meshcfg)
 554 {
 555         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 556         struct cfg80211_internal_bss *bss, *res = NULL;
 557
 558         spin_lock_bh(&dev->bss_lock);
 559
 560         list_for_each_entry(bss, &dev->bss_list, list) {
 561                 if (channel && bss->pub.channel != channel)
 562                         continue;
 563                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
 564                         res = bss;
 565                         kref_get(&res->ref);
 566                         break;
 567                 }
 568         }
 569
 570         spin_unlock_bh(&dev->bss_lock);
 571         if (!res)
 572                 return NULL;
 573         return &res->pub;
 574 }
 575 EXPORT_SYMBOL(cfg80211_get_mesh);
 576
 577
 578 static void rb_insert_bss(struct cfg80211_registered_device *dev,
 579                           struct cfg80211_internal_bss *bss)
 580 {
 581         struct rb_node **p = &dev->bss_tree.rb_node;
 582         struct rb_node *parent = NULL;
 583         struct cfg80211_internal_bss *tbss;
 584         int cmp;
 585
 586         while (*p) {
 587                 parent = *p;
 588                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
 589
 590                 cmp = cmp_bss(&bss->pub, &tbss->pub);
 591
 592                 if (WARN_ON(!cmp)) {
 593                         /* will sort of leak this BSS */
 594                         return;
 595                 }
 596
 597                 if (cmp < 0)
 598                         p = &(*p)->rb_left;
 599                 else
 600                         p = &(*p)->rb_right;
 601         }
 602
 603         rb_link_node(&bss->rbn, parent, p);
 604         rb_insert_color(&bss->rbn, &dev->bss_tree);
 605 }
 606
 607 static struct cfg80211_internal_bss *
 608 rb_find_bss(struct cfg80211_registered_device *dev,
 609             struct cfg80211_internal_bss *res)
 610 {
 611         struct rb_node *n = dev->bss_tree.rb_node;
 612         struct cfg80211_internal_bss *bss;
 613         int r;
 614
 615         while (n) {
 616                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
 617                 r = cmp_bss(&res->pub, &bss->pub);
 618
 619                 if (r == 0)
 620                         return bss;
 621                 else if (r < 0)
 622                         n = n->rb_left;
 623                 else
 624                         n = n->rb_right;
 625         }
 626
 627         return NULL;
 628 }
 629
 630 static struct cfg80211_internal_bss *
 631 rb_find_hidden_bss(struct cfg80211_registered_device *dev,
 632                    struct cfg80211_internal_bss *res)
 633 {
 634         struct rb_node *n = dev->bss_tree.rb_node;
 635         struct cfg80211_internal_bss *bss;
 636         int r;
 637
 638         while (n) {
 639                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
 640                 r = cmp_hidden_bss(&res->pub, &bss->pub);
 641
 642                 if (r == 0)
 643                         return bss;
 644                 else if (r < 0)
 645                         n = n->rb_left;
 646                 else
 647                         n = n->rb_right;
 648         }
 649
 650         return NULL;
 651 }
 652
 653 static void
 654 copy_hidden_ies(struct cfg80211_internal_bss *res,
 655                 struct cfg80211_internal_bss *hidden)
 656 {
 657         const struct cfg80211_bss_ies *ies;
 658
 659         if (rcu_access_pointer(res->pub.beacon_ies))
 660                 return;
 661
 662         ies = rcu_access_pointer(hidden->pub.beacon_ies);
 663         if (WARN_ON(!ies))
 664                 return;
 665
 666         ies = kmemdup(ies, sizeof(*ies) + ies->len, GFP_ATOMIC);
 667         if (unlikely(!ies))
 668                 return;
 669         rcu_assign_pointer(res->pub.beacon_ies, ies);
 670 }
 671
 672 static struct cfg80211_internal_bss *
 673 cfg80211_bss_update(struct cfg80211_registered_device *dev,
 674                     struct cfg80211_internal_bss *tmp)
 675 {
 676         struct cfg80211_internal_bss *found = NULL;
 677
 678         if (WARN_ON(!tmp->pub.channel))
 679                 return NULL;
 680
 681         tmp->ts = jiffies;
 682
 683         spin_lock_bh(&dev->bss_lock);
 684
 685         if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
 686                 spin_unlock_bh(&dev->bss_lock);
 687                 return NULL;
 688         }
 689
 690         found = rb_find_bss(dev, tmp);
 691
 692         if (found) {
 693                 found->pub.beacon_interval = tmp->pub.beacon_interval;
 694                 found->pub.tsf = tmp->pub.tsf;
 695                 found->pub.signal = tmp->pub.signal;
 696                 found->pub.capability = tmp->pub.capability;
 697                 found->ts = tmp->ts;
 698
 699                 /* Update IEs */
 700                 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
 701                         const struct cfg80211_bss_ies *old;
 702
 703                         old = rcu_access_pointer(found->pub.proberesp_ies);
 704
 705                         rcu_assign_pointer(found->pub.proberesp_ies,
 706                                            tmp->pub.proberesp_ies);
 707                         /* Override possible earlier Beacon frame IEs */
 708                         rcu_assign_pointer(found->pub.ies,
 709                                            tmp->pub.proberesp_ies);
 710                         if (old)
 711                                 kfree_rcu((struct cfg80211_bss_ies *)old,
 712                                           rcu_head);
 713                 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
 714                         const struct cfg80211_bss_ies *old, *ies;
 715
 716                         old = rcu_access_pointer(found->pub.beacon_ies);
 717                         ies = rcu_access_pointer(found->pub.ies);
 718
 719                         rcu_assign_pointer(found->pub.beacon_ies,
 720                                            tmp->pub.beacon_ies);
 721
 722                         /* Override IEs if they were from a beacon before */
 723                         if (old == ies)
 724                                 rcu_assign_pointer(found->pub.ies,
 725                                                    tmp->pub.beacon_ies);
 726
 727                         if (old)
 728                                 kfree_rcu((struct cfg80211_bss_ies *)old,
 729                                           rcu_head);
 730                 }
 731         } else {
 732                 struct cfg80211_internal_bss *new;
 733                 struct cfg80211_internal_bss *hidden;
 734                 struct cfg80211_bss_ies *ies;
 735
 736                 /* First check if the beacon is a probe response from
 737                  * a hidden bss. If so, copy beacon ies (with nullified
 738                  * ssid) into the probe response bss entry (with real ssid).
 739                  * It is required basically for PSM implementation
 740                  * (probe responses do not contain tim ie) */
 741
 742                 /* TODO: The code is not trying to update existing probe
 743                  * response bss entries when beacon ies are
 744                  * getting changed. */
 745                 hidden = rb_find_hidden_bss(dev, tmp);
 746                 if (hidden)
 747                         copy_hidden_ies(tmp, hidden);
 748
 749                 /*
 750                  * create a copy -- the "res" variable that is passed in
 751                  * is allocated on the stack since it's not needed in the
 752                  * more common case of an update
 753                  */
 754                 new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size,
 755                               GFP_ATOMIC);
 756                 if (!new) {
 757                         ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
 758                         if (ies)
 759                                 kfree_rcu(ies, rcu_head);
 760                         ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
 761                         if (ies)
 762                                 kfree_rcu(ies, rcu_head);
 763                         spin_unlock_bh(&dev->bss_lock);
 764                         return NULL;
 765                 }
 766                 memcpy(new, tmp, sizeof(*new));
 767                 kref_init(&new->ref);
 768                 list_add_tail(&new->list, &dev->bss_list);
 769                 rb_insert_bss(dev, new);
 770                 found = new;
 771         }
 772
 773         dev->bss_generation++;
 774         spin_unlock_bh(&dev->bss_lock);
 775
 776         kref_get(&found->ref);
 777         return found;
 778 }
 779
 780 static struct ieee80211_channel *
 781 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
 782                          struct ieee80211_channel *channel)
 783 {
 784         const u8 *tmp;
 785         u32 freq;
 786         int channel_number = -1;
 787
 788         tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
 789         if (tmp && tmp[1] == 1) {
 790                 channel_number = tmp[2];
 791         } else {
 792                 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
 793                 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
 794                         struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
 795
 796                         channel_number = htop->primary_chan;
 797                 }
 798         }
 799
 800         if (channel_number < 0)
 801                 return channel;
 802
 803         freq = ieee80211_channel_to_frequency(channel_number, channel->band);
 804         channel = ieee80211_get_channel(wiphy, freq);
 805         if (!channel)
 806                 return NULL;
 807         if (channel->flags & IEEE80211_CHAN_DISABLED)
 808                 return NULL;
 809         return channel;
 810 }
 811
 812 struct cfg80211_bss*
 813 cfg80211_inform_bss(struct wiphy *wiphy,
 814                     struct ieee80211_channel *channel,
 815                     const u8 *bssid, u64 tsf, u16 capability,
 816                     u16 beacon_interval, const u8 *ie, size_t ielen,
 817                     s32 signal, gfp_t gfp)
 818 {
 819         struct cfg80211_bss_ies *ies;
 820         struct cfg80211_internal_bss tmp = {}, *res;
 821
 822         if (WARN_ON(!wiphy))
 823                 return NULL;
 824
 825         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
 826                         (signal < 0 || signal > 100)))
 827                 return NULL;
 828
 829         channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel);
 830         if (!channel)
 831                 return NULL;
 832
 833         memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
 834         tmp.pub.channel = channel;
 835         tmp.pub.signal = signal;
 836         tmp.pub.tsf = tsf;
 837         tmp.pub.beacon_interval = beacon_interval;
 838         tmp.pub.capability = capability;
 839         /*
 840          * Since we do not know here whether the IEs are from a Beacon or Probe
 841          * Response frame, we need to pick one of the options and only use it
 842          * with the driver that does not provide the full Beacon/Probe Response
 843          * frame. Use Beacon frame pointer to avoid indicating that this should
 844          * override the iies pointer should we have received an earlier
 845          * indication of Probe Response data.
 846          *
 847          * The initial buffer for the IEs is allocated with the BSS entry and
 848          * is located after the private area.
 849          */
 850         ies = kmalloc(sizeof(*ies) + ielen, gfp);
 851         if (!ies)
 852                 return NULL;
 853         ies->len = ielen;
 854         memcpy(ies->data, ie, ielen);
 855
 856         rcu_assign_pointer(tmp.pub.beacon_ies, ies);
 857         rcu_assign_pointer(tmp.pub.ies, ies);
 858
 859         res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp);
 860         if (!res)
 861                 return NULL;
 862
 863         if (res->pub.capability & WLAN_CAPABILITY_ESS)
 864                 regulatory_hint_found_beacon(wiphy, channel, gfp);
 865
 866         trace_cfg80211_return_bss(&res->pub);
 867         /* cfg80211_bss_update gives us a referenced result */
 868         return &res->pub;
 869 }
 870 EXPORT_SYMBOL(cfg80211_inform_bss);
 871
 872 struct cfg80211_bss *
 873 cfg80211_inform_bss_frame(struct wiphy *wiphy,
 874                           struct ieee80211_channel *channel,
 875                           struct ieee80211_mgmt *mgmt, size_t len,
 876                           s32 signal, gfp_t gfp)
 877 {
 878         struct cfg80211_internal_bss tmp = {}, *res;
 879         struct cfg80211_bss_ies *ies;
 880         size_t ielen = len - offsetof(struct ieee80211_mgmt,
 881                                       u.probe_resp.variable);
 882
 883         BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
 884                         offsetof(struct ieee80211_mgmt, u.beacon.variable));
 885
 886         trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal);
 887
 888         if (WARN_ON(!mgmt))
 889                 return NULL;
 890
 891         if (WARN_ON(!wiphy))
 892                 return NULL;
 893
 894         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
 895                     (signal < 0 || signal > 100)))
 896                 return NULL;
 897
 898         if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
 899                 return NULL;
 900
 901         channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
 902                                            ielen, channel);
 903         if (!channel)
 904                 return NULL;
 905
 906         ies = kmalloc(sizeof(*ies) + ielen, gfp);
 907         if (!ies)
 908                 return NULL;
 909         ies->len = ielen;
 910         memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
 911
 912         if (ieee80211_is_probe_resp(mgmt->frame_control))
 913                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
 914         else
 915                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
 916         rcu_assign_pointer(tmp.pub.ies, ies);
 917
 918         memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
 919         tmp.pub.channel = channel;
 920         tmp.pub.signal = signal;
 921         tmp.pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
 922         tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
 923         tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
 924
 925         res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp);
 926         if (!res)
 927                 return NULL;
 928
 929         if (res->pub.capability & WLAN_CAPABILITY_ESS)
 930                 regulatory_hint_found_beacon(wiphy, channel, gfp);
 931
 932         trace_cfg80211_return_bss(&res->pub);
 933         /* cfg80211_bss_update gives us a referenced result */
 934         return &res->pub;
 935 }
 936 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
 937
 938 void cfg80211_ref_bss(struct cfg80211_bss *pub)
 939 {
 940         struct cfg80211_internal_bss *bss;
 941
 942         if (!pub)
 943                 return;
 944
 945         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 946         kref_get(&bss->ref);
 947 }
 948 EXPORT_SYMBOL(cfg80211_ref_bss);
 949
 950 void cfg80211_put_bss(struct cfg80211_bss *pub)
 951 {
 952         struct cfg80211_internal_bss *bss;
 953
 954         if (!pub)
 955                 return;
 956
 957         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 958         kref_put(&bss->ref, bss_release);
 959 }
 960 EXPORT_SYMBOL(cfg80211_put_bss);
 961
 962 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 963 {
 964         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 965         struct cfg80211_internal_bss *bss;
 966
 967         if (WARN_ON(!pub))
 968                 return;
 969
 970         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 971
 972         spin_lock_bh(&dev->bss_lock);
 973         if (!list_empty(&bss->list)) {
 974                 __cfg80211_unlink_bss(dev, bss);
 975                 dev->bss_generation++;
 976         }
 977         spin_unlock_bh(&dev->bss_lock);
 978 }
 979 EXPORT_SYMBOL(cfg80211_unlink_bss);
 980
 981 #ifdef CONFIG_CFG80211_WEXT
 982 int cfg80211_wext_siwscan(struct net_device *dev,
 983                           struct iw_request_info *info,
 984                           union iwreq_data *wrqu, char *extra)
 985 {
 986         struct cfg80211_registered_device *rdev;
 987         struct wiphy *wiphy;
 988         struct iw_scan_req *wreq = NULL;
 989         struct cfg80211_scan_request *creq = NULL;
 990         int i, err, n_channels = 0;
 991         enum ieee80211_band band;
 992
 993         if (!netif_running(dev))
 994                 return -ENETDOWN;
 995
 996         if (wrqu->data.length == sizeof(struct iw_scan_req))
 997                 wreq = (struct iw_scan_req *)extra;
 998
 999         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1000
1001         if (IS_ERR(rdev))
1002                 return PTR_ERR(rdev);
1003
1004         if (rdev->scan_req) {
1005                 err = -EBUSY;
1006                 goto out;
1007         }
1008
1009         wiphy = &rdev->wiphy;
1010
1011         /* Determine number of channels, needed to allocate creq */
1012         if (wreq && wreq->num_channels)
1013                 n_channels = wreq->num_channels;
1014         else {
1015                 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1016                         if (wiphy->bands[band])
1017                                 n_channels += wiphy->bands[band]->n_channels;
1018         }
1019
1020         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1021                        n_channels * sizeof(void *),
1022                        GFP_ATOMIC);
1023         if (!creq) {
1024                 err = -ENOMEM;
1025                 goto out;
1026         }
1027
1028         creq->wiphy = wiphy;
1029         creq->wdev = dev->ieee80211_ptr;
1030         /* SSIDs come after channels */
1031         creq->ssids = (void *)&creq->channels[n_channels];
1032         creq->n_channels = n_channels;
1033         creq->n_ssids = 1;
1034         creq->scan_start = jiffies;
1035
1036         /* translate "Scan on frequencies" request */
1037         i = 0;
1038         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1039                 int j;
1040
1041                 if (!wiphy->bands[band])
1042                         continue;
1043
1044                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1045                         /* ignore disabled channels */
1046                         if (wiphy->bands[band]->channels[j].flags &
1047                                                 IEEE80211_CHAN_DISABLED)
1048                                 continue;
1049
1050                         /* If we have a wireless request structure and the
1051                          * wireless request specifies frequencies, then search
1052                          * for the matching hardware channel.
1053                          */
1054                         if (wreq && wreq->num_channels) {
1055                                 int k;
1056                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1057                                 for (k = 0; k < wreq->num_channels; k++) {
1058                                         int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
1059                                         if (wext_freq == wiphy_freq)
1060                                                 goto wext_freq_found;
1061                                 }
1062                                 goto wext_freq_not_found;
1063                         }
1064
1065                 wext_freq_found:
1066                         creq->channels[i] = &wiphy->bands[band]->channels[j];
1067                         i++;
1068                 wext_freq_not_found: ;
1069                 }
1070         }
1071         /* No channels found? */
1072         if (!i) {
1073                 err = -EINVAL;
1074                 goto out;
1075         }
1076
1077         /* Set real number of channels specified in creq->channels[] */
1078         creq->n_channels = i;
1079
1080         /* translate "Scan for SSID" request */
1081         if (wreq) {
1082                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1083                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1084                                 err = -EINVAL;
1085                                 goto out;
1086                         }
1087                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1088                         creq->ssids[0].ssid_len = wreq->essid_len;
1089                 }
1090                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1091                         creq->n_ssids = 0;
1092         }
1093
1094         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1095                 if (wiphy->bands[i])
1096                         creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1097
1098         rdev->scan_req = creq;
1099         err = rdev_scan(rdev, creq);
1100         if (err) {
1101                 rdev->scan_req = NULL;
1102                 /* creq will be freed below */
1103         } else {
1104                 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1105                 /* creq now owned by driver */
1106                 creq = NULL;
1107                 dev_hold(dev);
1108         }
1109  out:
1110         kfree(creq);
1111         cfg80211_unlock_rdev(rdev);
1112         return err;
1113 }
1114 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
1115
1116 static void ieee80211_scan_add_ies(struct iw_request_info *info,
1117                                    const struct cfg80211_bss_ies *ies,
1118                                    char **current_ev, char *end_buf)
1119 {
1120         const u8 *pos, *end, *next;
1121         struct iw_event iwe;
1122
1123         if (!ies)
1124                 return;
1125
1126         /*
1127          * If needed, fragment the IEs buffer (at IE boundaries) into short
1128          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1129          */
1130         pos = ies->data;
1131         end = pos + ies->len;
1132
1133         while (end - pos > IW_GENERIC_IE_MAX) {
1134                 next = pos + 2 + pos[1];
1135                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1136                         next = next + 2 + next[1];
1137
1138                 memset(&iwe, 0, sizeof(iwe));
1139                 iwe.cmd = IWEVGENIE;
1140                 iwe.u.data.length = next - pos;
1141                 *current_ev = iwe_stream_add_point(info, *current_ev,
1142                                                    end_buf, &iwe,
1143                                                    (void *)pos);
1144
1145                 pos = next;
1146         }
1147
1148         if (end > pos) {
1149                 memset(&iwe, 0, sizeof(iwe));
1150                 iwe.cmd = IWEVGENIE;
1151                 iwe.u.data.length = end - pos;
1152                 *current_ev = iwe_stream_add_point(info, *current_ev,
1153                                                    end_buf, &iwe,
1154                                                    (void *)pos);
1155         }
1156 }
1157
1158 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
1159 {
1160         unsigned long end = jiffies;
1161
1162         if (end >= start)
1163                 return jiffies_to_msecs(end - start);
1164
1165         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
1166 }
1167
1168 static char *
1169 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1170               struct cfg80211_internal_bss *bss, char *current_ev,
1171               char *end_buf)
1172 {
1173         const struct cfg80211_bss_ies *ies;
1174         struct iw_event iwe;
1175         const u8 *ie;
1176         u8 *buf, *cfg, *p;
1177         int rem, i, sig;
1178         bool ismesh = false;
1179
1180         memset(&iwe, 0, sizeof(iwe));
1181         iwe.cmd = SIOCGIWAP;
1182         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1183         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1184         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1185                                           IW_EV_ADDR_LEN);
1186
1187         memset(&iwe, 0, sizeof(iwe));
1188         iwe.cmd = SIOCGIWFREQ;
1189         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1190         iwe.u.freq.e = 0;
1191         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1192                                           IW_EV_FREQ_LEN);
1193
1194         memset(&iwe, 0, sizeof(iwe));
1195         iwe.cmd = SIOCGIWFREQ;
1196         iwe.u.freq.m = bss->pub.channel->center_freq;
1197         iwe.u.freq.e = 6;
1198         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1199                                           IW_EV_FREQ_LEN);
1200
1201         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1202                 memset(&iwe, 0, sizeof(iwe));
1203                 iwe.cmd = IWEVQUAL;
1204                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1205                                      IW_QUAL_NOISE_INVALID |
1206                                      IW_QUAL_QUAL_UPDATED;
1207                 switch (wiphy->signal_type) {
1208                 case CFG80211_SIGNAL_TYPE_MBM:
1209                         sig = bss->pub.signal / 100;
1210                         iwe.u.qual.level = sig;
1211                         iwe.u.qual.updated |= IW_QUAL_DBM;
1212                         if (sig < -110)         /* rather bad */
1213                                 sig = -110;
1214                         else if (sig > -40)     /* perfect */
1215                                 sig = -40;
1216                         /* will give a range of 0 .. 70 */
1217                         iwe.u.qual.qual = sig + 110;
1218                         break;
1219                 case CFG80211_SIGNAL_TYPE_UNSPEC:
1220                         iwe.u.qual.level = bss->pub.signal;
1221                         /* will give range 0 .. 100 */
1222                         iwe.u.qual.qual = bss->pub.signal;
1223                         break;
1224                 default:
1225                         /* not reached */
1226                         break;
1227                 }
1228                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1229                                                   &iwe, IW_EV_QUAL_LEN);
1230         }
1231
1232         memset(&iwe, 0, sizeof(iwe));
1233         iwe.cmd = SIOCGIWENCODE;
1234         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1235                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1236         else
1237                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1238         iwe.u.data.length = 0;
1239         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1240                                           &iwe, "");
1241
1242         rcu_read_lock();
1243         ies = rcu_dereference(bss->pub.ies);
1244         if (ies) {
1245                 rem = ies->len;
1246                 ie = ies->data;
1247         } else {
1248                 rem = 0;
1249                 ie = NULL;
1250         }
1251
1252         while (ies && rem >= 2) {
1253                 /* invalid data */
1254                 if (ie[1] > rem - 2)
1255                         break;
1256
1257                 switch (ie[0]) {
1258                 case WLAN_EID_SSID:
1259                         memset(&iwe, 0, sizeof(iwe));
1260                         iwe.cmd = SIOCGIWESSID;
1261                         iwe.u.data.length = ie[1];
1262                         iwe.u.data.flags = 1;
1263                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1264                                                           &iwe, (u8 *)ie + 2);
1265                         break;
1266                 case WLAN_EID_MESH_ID:
1267                         memset(&iwe, 0, sizeof(iwe));
1268                         iwe.cmd = SIOCGIWESSID;
1269                         iwe.u.data.length = ie[1];
1270                         iwe.u.data.flags = 1;
1271                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1272                                                           &iwe, (u8 *)ie + 2);
1273                         break;
1274                 case WLAN_EID_MESH_CONFIG:
1275                         ismesh = true;
1276                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1277                                 break;
1278                         buf = kmalloc(50, GFP_ATOMIC);
1279                         if (!buf)
1280                                 break;
1281                         cfg = (u8 *)ie + 2;
1282                         memset(&iwe, 0, sizeof(iwe));
1283                         iwe.cmd = IWEVCUSTOM;
1284                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1285                                 "0x%02X", cfg[0]);
1286                         iwe.u.data.length = strlen(buf);
1287                         current_ev = iwe_stream_add_point(info, current_ev,
1288                                                           end_buf,
1289                                                           &iwe, buf);
1290                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
1291                                 cfg[1]);
1292                         iwe.u.data.length = strlen(buf);
1293                         current_ev = iwe_stream_add_point(info, current_ev,
1294                                                           end_buf,
1295                                                           &iwe, buf);
1296                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1297                                 cfg[2]);
1298                         iwe.u.data.length = strlen(buf);
1299                         current_ev = iwe_stream_add_point(info, current_ev,
1300                                                           end_buf,
1301                                                           &iwe, buf);
1302                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1303                         iwe.u.data.length = strlen(buf);
1304                         current_ev = iwe_stream_add_point(info, current_ev,
1305                                                           end_buf,
1306                                                           &iwe, buf);
1307                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1308                         iwe.u.data.length = strlen(buf);
1309                         current_ev = iwe_stream_add_point(info, current_ev,
1310                                                           end_buf,
1311                                                           &iwe, buf);
1312                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1313                         iwe.u.data.length = strlen(buf);
1314                         current_ev = iwe_stream_add_point(info, current_ev,
1315                                                           end_buf,
1316                                                           &iwe, buf);
1317                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1318                         iwe.u.data.length = strlen(buf);
1319                         current_ev = iwe_stream_add_point(info, current_ev,
1320                                                           end_buf,
1321                                                           &iwe, buf);
1322                         kfree(buf);
1323                         break;
1324                 case WLAN_EID_SUPP_RATES:
1325                 case WLAN_EID_EXT_SUPP_RATES:
1326                         /* display all supported rates in readable format */
1327                         p = current_ev + iwe_stream_lcp_len(info);
1328
1329                         memset(&iwe, 0, sizeof(iwe));
1330                         iwe.cmd = SIOCGIWRATE;
1331                         /* Those two flags are ignored... */
1332                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1333
1334                         for (i = 0; i < ie[1]; i++) {
1335                                 iwe.u.bitrate.value =
1336                                         ((ie[i + 2] & 0x7f) * 500000);
1337                                 p = iwe_stream_add_value(info, current_ev, p,
1338                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
1339                         }
1340                         current_ev = p;
1341                         break;
1342                 }
1343                 rem -= ie[1] + 2;
1344                 ie += ie[1] + 2;
1345         }
1346
1347         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1348             ismesh) {
1349                 memset(&iwe, 0, sizeof(iwe));
1350                 iwe.cmd = SIOCGIWMODE;
1351                 if (ismesh)
1352                         iwe.u.mode = IW_MODE_MESH;
1353                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1354                         iwe.u.mode = IW_MODE_MASTER;
1355                 else
1356                         iwe.u.mode = IW_MODE_ADHOC;
1357                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1358                                                   &iwe, IW_EV_UINT_LEN);
1359         }
1360
1361         buf = kmalloc(30, GFP_ATOMIC);
1362         if (buf) {
1363                 memset(&iwe, 0, sizeof(iwe));
1364                 iwe.cmd = IWEVCUSTOM;
1365                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1366                 iwe.u.data.length = strlen(buf);
1367                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1368                                                   &iwe, buf);
1369                 memset(&iwe, 0, sizeof(iwe));
1370                 iwe.cmd = IWEVCUSTOM;
1371                 sprintf(buf, " Last beacon: %ums ago",
1372                         elapsed_jiffies_msecs(bss->ts));
1373                 iwe.u.data.length = strlen(buf);
1374                 current_ev = iwe_stream_add_point(info, current_ev,
1375                                                   end_buf, &iwe, buf);
1376                 kfree(buf);
1377         }
1378
1379         ieee80211_scan_add_ies(info, ies, &current_ev, end_buf);
1380         rcu_read_unlock();
1381
1382         return current_ev;
1383 }
1384
1385
1386 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1387                                   struct iw_request_info *info,
1388                                   char *buf, size_t len)
1389 {
1390         char *current_ev = buf;
1391         char *end_buf = buf + len;
1392         struct cfg80211_internal_bss *bss;
1393
1394         spin_lock_bh(&dev->bss_lock);
1395         cfg80211_bss_expire(dev);
1396
1397         list_for_each_entry(bss, &dev->bss_list, list) {
1398                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1399                         spin_unlock_bh(&dev->bss_lock);
1400                         return -E2BIG;
1401                 }
1402                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1403                                            current_ev, end_buf);
1404         }
1405         spin_unlock_bh(&dev->bss_lock);
1406         return current_ev - buf;
1407 }
1408
1409
1410 int cfg80211_wext_giwscan(struct net_device *dev,
1411                           struct iw_request_info *info,
1412                           struct iw_point *data, char *extra)
1413 {
1414         struct cfg80211_registered_device *rdev;
1415         int res;
1416
1417         if (!netif_running(dev))
1418                 return -ENETDOWN;
1419
1420         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1421
1422         if (IS_ERR(rdev))
1423                 return PTR_ERR(rdev);
1424
1425         if (rdev->scan_req) {
1426                 res = -EAGAIN;
1427                 goto out;
1428         }
1429
1430         res = ieee80211_scan_results(rdev, info, extra, data->length);
1431         data->length = 0;
1432         if (res >= 0) {
1433                 data->length = res;
1434                 res = 0;
1435         }
1436
1437  out:
1438         cfg80211_unlock_rdev(rdev);
1439         return res;
1440 }
1441 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1442 #endif