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