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