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/module.h>
   8 #include <linux/netdevice.h>
   9 #include <linux/wireless.h>
  10 #include <linux/nl80211.h>
  11 #include <linux/etherdevice.h>
  12 #include <net/arp.h>
  13 #include <net/cfg80211.h>
  14 #include <net/iw_handler.h>
  15 #include "core.h"
  16 #include "nl80211.h"
  17
  18 #define IEEE80211_SCAN_RESULT_EXPIRE    (10 * HZ)
  19
  20 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
  21 {
  22         struct net_device *dev;
  23 #ifdef CONFIG_WIRELESS_EXT
  24         union iwreq_data wrqu;
  25 #endif
  26
  27         dev = dev_get_by_index(&init_net, request->ifidx);
  28         if (!dev)
  29                 goto out;
  30
  31         WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
  32         wiphy_to_dev(request->wiphy)->scan_req = NULL;
  33
  34         if (aborted)
  35                 nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev);
  36         else
  37                 nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev);
  38
  39 #ifdef CONFIG_WIRELESS_EXT
  40         if (!aborted) {
  41                 memset(&wrqu, 0, sizeof(wrqu));
  42
  43                 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
  44         }
  45 #endif
  46
  47         dev_put(dev);
  48
  49  out:
  50         kfree(request);
  51 }
  52 EXPORT_SYMBOL(cfg80211_scan_done);
  53
  54 static void bss_release(struct kref *ref)
  55 {
  56         struct cfg80211_internal_bss *bss;
  57
  58         bss = container_of(ref, struct cfg80211_internal_bss, ref);
  59         if (bss->pub.free_priv)
  60                 bss->pub.free_priv(&bss->pub);
  61
  62         if (bss->ies_allocated)
  63                 kfree(bss->pub.information_elements);
  64
  65         kfree(bss);
  66 }
  67
  68 /* must hold dev->bss_lock! */
  69 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
  70                       unsigned long age_secs)
  71 {
  72         struct cfg80211_internal_bss *bss;
  73         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
  74
  75         list_for_each_entry(bss, &dev->bss_list, list) {
  76                 bss->ts -= age_jiffies;
  77         }
  78 }
  79
  80 /* must hold dev->bss_lock! */
  81 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
  82 {
  83         struct cfg80211_internal_bss *bss, *tmp;
  84         bool expired = false;
  85
  86         list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
  87                 if (bss->hold ||
  88                     !time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
  89                         continue;
  90                 list_del(&bss->list);
  91                 rb_erase(&bss->rbn, &dev->bss_tree);
  92                 kref_put(&bss->ref, bss_release);
  93                 expired = true;
  94         }
  95
  96         if (expired)
  97                 dev->bss_generation++;
  98 }
  99
 100 static u8 *find_ie(u8 num, u8 *ies, size_t len)
 101 {
 102         while (len > 2 && ies[0] != num) {
 103                 len -= ies[1] + 2;
 104                 ies += ies[1] + 2;
 105         }
 106         if (len < 2)
 107                 return NULL;
 108         if (len < 2 + ies[1])
 109                 return NULL;
 110         return ies;
 111 }
 112
 113 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
 114 {
 115         const u8 *ie1 = find_ie(num, ies1, len1);
 116         const u8 *ie2 = find_ie(num, ies2, len2);
 117         int r;
 118
 119         if (!ie1 && !ie2)
 120                 return 0;
 121         if (!ie1)
 122                 return -1;
 123
 124         r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
 125         if (r == 0 && ie1[1] != ie2[1])
 126                 return ie2[1] - ie1[1];
 127         return r;
 128 }
 129
 130 static bool is_bss(struct cfg80211_bss *a,
 131                    const u8 *bssid,
 132                    const u8 *ssid, size_t ssid_len)
 133 {
 134         const u8 *ssidie;
 135
 136         if (bssid && compare_ether_addr(a->bssid, bssid))
 137                 return false;
 138
 139         if (!ssid)
 140                 return true;
 141
 142         ssidie = find_ie(WLAN_EID_SSID,
 143                          a->information_elements,
 144                          a->len_information_elements);
 145         if (!ssidie)
 146                 return false;
 147         if (ssidie[1] != ssid_len)
 148                 return false;
 149         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
 150 }
 151
 152 static bool is_mesh(struct cfg80211_bss *a,
 153                     const u8 *meshid, size_t meshidlen,
 154                     const u8 *meshcfg)
 155 {
 156         const u8 *ie;
 157
 158         if (!is_zero_ether_addr(a->bssid))
 159                 return false;
 160
 161         ie = find_ie(WLAN_EID_MESH_ID,
 162                      a->information_elements,
 163                      a->len_information_elements);
 164         if (!ie)
 165                 return false;
 166         if (ie[1] != meshidlen)
 167                 return false;
 168         if (memcmp(ie + 2, meshid, meshidlen))
 169                 return false;
 170
 171         ie = find_ie(WLAN_EID_MESH_CONFIG,
 172                      a->information_elements,
 173                      a->len_information_elements);
 174         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
 175                 return false;
 176
 177         /*
 178          * Ignore mesh capability (last two bytes of the IE) when
 179          * comparing since that may differ between stations taking
 180          * part in the same mesh.
 181          */
 182         return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0;
 183 }
 184
 185 static int cmp_bss(struct cfg80211_bss *a,
 186                    struct cfg80211_bss *b)
 187 {
 188         int r;
 189
 190         if (a->channel != b->channel)
 191                 return b->channel->center_freq - a->channel->center_freq;
 192
 193         r = memcmp(a->bssid, b->bssid, ETH_ALEN);
 194         if (r)
 195                 return r;
 196
 197         if (is_zero_ether_addr(a->bssid)) {
 198                 r = cmp_ies(WLAN_EID_MESH_ID,
 199                             a->information_elements,
 200                             a->len_information_elements,
 201                             b->information_elements,
 202                             b->len_information_elements);
 203                 if (r)
 204                         return r;
 205                 return cmp_ies(WLAN_EID_MESH_CONFIG,
 206                                a->information_elements,
 207                                a->len_information_elements,
 208                                b->information_elements,
 209                                b->len_information_elements);
 210         }
 211
 212         return cmp_ies(WLAN_EID_SSID,
 213                        a->information_elements,
 214                        a->len_information_elements,
 215                        b->information_elements,
 216                        b->len_information_elements);
 217 }
 218
 219 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
 220                                       struct ieee80211_channel *channel,
 221                                       const u8 *bssid,
 222                                       const u8 *ssid, size_t ssid_len,
 223                                       u16 capa_mask, u16 capa_val)
 224 {
 225         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 226         struct cfg80211_internal_bss *bss, *res = NULL;
 227
 228         spin_lock_bh(&dev->bss_lock);
 229
 230         list_for_each_entry(bss, &dev->bss_list, list) {
 231                 if ((bss->pub.capability & capa_mask) != capa_val)
 232                         continue;
 233                 if (channel && bss->pub.channel != channel)
 234                         continue;
 235                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
 236                         res = bss;
 237                         kref_get(&res->ref);
 238                         break;
 239                 }
 240         }
 241
 242         spin_unlock_bh(&dev->bss_lock);
 243         if (!res)
 244                 return NULL;
 245         return &res->pub;
 246 }
 247 EXPORT_SYMBOL(cfg80211_get_bss);
 248
 249 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
 250                                        struct ieee80211_channel *channel,
 251                                        const u8 *meshid, size_t meshidlen,
 252                                        const u8 *meshcfg)
 253 {
 254         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 255         struct cfg80211_internal_bss *bss, *res = NULL;
 256
 257         spin_lock_bh(&dev->bss_lock);
 258
 259         list_for_each_entry(bss, &dev->bss_list, list) {
 260                 if (channel && bss->pub.channel != channel)
 261                         continue;
 262                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
 263                         res = bss;
 264                         kref_get(&res->ref);
 265                         break;
 266                 }
 267         }
 268
 269         spin_unlock_bh(&dev->bss_lock);
 270         if (!res)
 271                 return NULL;
 272         return &res->pub;
 273 }
 274 EXPORT_SYMBOL(cfg80211_get_mesh);
 275
 276
 277 static void rb_insert_bss(struct cfg80211_registered_device *dev,
 278                           struct cfg80211_internal_bss *bss)
 279 {
 280         struct rb_node **p = &dev->bss_tree.rb_node;
 281         struct rb_node *parent = NULL;
 282         struct cfg80211_internal_bss *tbss;
 283         int cmp;
 284
 285         while (*p) {
 286                 parent = *p;
 287                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
 288
 289                 cmp = cmp_bss(&bss->pub, &tbss->pub);
 290
 291                 if (WARN_ON(!cmp)) {
 292                         /* will sort of leak this BSS */
 293                         return;
 294                 }
 295
 296                 if (cmp < 0)
 297                         p = &(*p)->rb_left;
 298                 else
 299                         p = &(*p)->rb_right;
 300         }
 301
 302         rb_link_node(&bss->rbn, parent, p);
 303         rb_insert_color(&bss->rbn, &dev->bss_tree);
 304 }
 305
 306 static struct cfg80211_internal_bss *
 307 rb_find_bss(struct cfg80211_registered_device *dev,
 308             struct cfg80211_internal_bss *res)
 309 {
 310         struct rb_node *n = dev->bss_tree.rb_node;
 311         struct cfg80211_internal_bss *bss;
 312         int r;
 313
 314         while (n) {
 315                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
 316                 r = cmp_bss(&res->pub, &bss->pub);
 317
 318                 if (r == 0)
 319                         return bss;
 320                 else if (r < 0)
 321                         n = n->rb_left;
 322                 else
 323                         n = n->rb_right;
 324         }
 325
 326         return NULL;
 327 }
 328
 329 static struct cfg80211_internal_bss *
 330 cfg80211_bss_update(struct cfg80211_registered_device *dev,
 331                     struct cfg80211_internal_bss *res,
 332                     bool overwrite)
 333 {
 334         struct cfg80211_internal_bss *found = NULL;
 335         const u8 *meshid, *meshcfg;
 336
 337         /*
 338          * The reference to "res" is donated to this function.
 339          */
 340
 341         if (WARN_ON(!res->pub.channel)) {
 342                 kref_put(&res->ref, bss_release);
 343                 return NULL;
 344         }
 345
 346         res->ts = jiffies;
 347
 348         if (is_zero_ether_addr(res->pub.bssid)) {
 349                 /* must be mesh, verify */
 350                 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
 351                                  res->pub.len_information_elements);
 352                 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
 353                                   res->pub.information_elements,
 354                                   res->pub.len_information_elements);
 355                 if (!meshid || !meshcfg ||
 356                     meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) {
 357                         /* bogus mesh */
 358                         kref_put(&res->ref, bss_release);
 359                         return NULL;
 360                 }
 361         }
 362
 363         spin_lock_bh(&dev->bss_lock);
 364
 365         found = rb_find_bss(dev, res);
 366
 367         if (found) {
 368                 kref_get(&found->ref);
 369                 found->pub.beacon_interval = res->pub.beacon_interval;
 370                 found->pub.tsf = res->pub.tsf;
 371                 found->pub.signal = res->pub.signal;
 372                 found->pub.capability = res->pub.capability;
 373                 found->ts = res->ts;
 374
 375                 /* overwrite IEs */
 376                 if (overwrite) {
 377                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
 378                         size_t ielen = res->pub.len_information_elements;
 379
 380                         if (ksize(found) >= used + ielen) {
 381                                 memcpy(found->pub.information_elements,
 382                                        res->pub.information_elements, ielen);
 383                                 found->pub.len_information_elements = ielen;
 384                         } else {
 385                                 u8 *ies = found->pub.information_elements;
 386
 387                                 if (found->ies_allocated) {
 388                                         if (ksize(ies) < ielen)
 389                                                 ies = krealloc(ies, ielen,
 390                                                                GFP_ATOMIC);
 391                                 } else
 392                                         ies = kmalloc(ielen, GFP_ATOMIC);
 393
 394                                 if (ies) {
 395                                         memcpy(ies, res->pub.information_elements, ielen);
 396                                         found->ies_allocated = true;
 397                                         found->pub.information_elements = ies;
 398                                         found->pub.len_information_elements = ielen;
 399                                 }
 400                         }
 401                 }
 402
 403                 kref_put(&res->ref, bss_release);
 404         } else {
 405                 /* this "consumes" the reference */
 406                 list_add_tail(&res->list, &dev->bss_list);
 407                 rb_insert_bss(dev, res);
 408                 found = res;
 409         }
 410
 411         dev->bss_generation++;
 412         spin_unlock_bh(&dev->bss_lock);
 413
 414         kref_get(&found->ref);
 415         return found;
 416 }
 417
 418 struct cfg80211_bss *
 419 cfg80211_inform_bss_frame(struct wiphy *wiphy,
 420                           struct ieee80211_channel *channel,
 421                           struct ieee80211_mgmt *mgmt, size_t len,
 422                           s32 signal, gfp_t gfp)
 423 {
 424         struct cfg80211_internal_bss *res;
 425         size_t ielen = len - offsetof(struct ieee80211_mgmt,
 426                                       u.probe_resp.variable);
 427         bool overwrite;
 428         size_t privsz = wiphy->bss_priv_size;
 429
 430         if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
 431                     (signal < 0 || signal > 100)))
 432                 return NULL;
 433
 434         if (WARN_ON(!mgmt || !wiphy ||
 435                     len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
 436                 return NULL;
 437
 438         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
 439         if (!res)
 440                 return NULL;
 441
 442         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
 443         res->pub.channel = channel;
 444         res->pub.signal = signal;
 445         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
 446         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
 447         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
 448         /* point to after the private area */
 449         res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
 450         memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
 451         res->pub.len_information_elements = ielen;
 452
 453         kref_init(&res->ref);
 454
 455         overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
 456
 457         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
 458         if (!res)
 459                 return NULL;
 460
 461         if (res->pub.capability & WLAN_CAPABILITY_ESS)
 462                 regulatory_hint_found_beacon(wiphy, channel, gfp);
 463
 464         /* cfg80211_bss_update gives us a referenced result */
 465         return &res->pub;
 466 }
 467 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
 468
 469 void cfg80211_put_bss(struct cfg80211_bss *pub)
 470 {
 471         struct cfg80211_internal_bss *bss;
 472
 473         if (!pub)
 474                 return;
 475
 476         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 477         kref_put(&bss->ref, bss_release);
 478 }
 479 EXPORT_SYMBOL(cfg80211_put_bss);
 480
 481 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 482 {
 483         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 484         struct cfg80211_internal_bss *bss;
 485
 486         if (WARN_ON(!pub))
 487                 return;
 488
 489         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 490
 491         spin_lock_bh(&dev->bss_lock);
 492
 493         list_del(&bss->list);
 494         rb_erase(&bss->rbn, &dev->bss_tree);
 495
 496         spin_unlock_bh(&dev->bss_lock);
 497
 498         kref_put(&bss->ref, bss_release);
 499 }
 500 EXPORT_SYMBOL(cfg80211_unlink_bss);
 501
 502 void cfg80211_hold_bss(struct cfg80211_bss *pub)
 503 {
 504         struct cfg80211_internal_bss *bss;
 505
 506         if (!pub)
 507                 return;
 508
 509         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 510         bss->hold = true;
 511 }
 512 EXPORT_SYMBOL(cfg80211_hold_bss);
 513
 514 void cfg80211_unhold_bss(struct cfg80211_bss *pub)
 515 {
 516         struct cfg80211_internal_bss *bss;
 517
 518         if (!pub)
 519                 return;
 520
 521         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 522         bss->hold = false;
 523 }
 524 EXPORT_SYMBOL(cfg80211_unhold_bss);
 525
 526 #ifdef CONFIG_WIRELESS_EXT
 527 int cfg80211_wext_siwscan(struct net_device *dev,
 528                           struct iw_request_info *info,
 529                           union iwreq_data *wrqu, char *extra)
 530 {
 531         struct cfg80211_registered_device *rdev;
 532         struct wiphy *wiphy;
 533         struct iw_scan_req *wreq = NULL;
 534         struct cfg80211_scan_request *creq;
 535         int i, err, n_channels = 0;
 536         enum ieee80211_band band;
 537
 538         if (!netif_running(dev))
 539                 return -ENETDOWN;
 540
 541         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
 542
 543         if (IS_ERR(rdev))
 544                 return PTR_ERR(rdev);
 545
 546         if (rdev->scan_req) {
 547                 err = -EBUSY;
 548                 goto out;
 549         }
 550
 551         wiphy = &rdev->wiphy;
 552
 553         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 554                 if (wiphy->bands[band])
 555                         n_channels += wiphy->bands[band]->n_channels;
 556
 557         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
 558                        n_channels * sizeof(void *),
 559                        GFP_ATOMIC);
 560         if (!creq) {
 561                 err = -ENOMEM;
 562                 goto out;
 563         }
 564
 565         creq->wiphy = wiphy;
 566         creq->ifidx = dev->ifindex;
 567         creq->ssids = (void *)(creq + 1);
 568         creq->channels = (void *)(creq->ssids + 1);
 569         creq->n_channels = n_channels;
 570         creq->n_ssids = 1;
 571
 572         /* all channels */
 573         i = 0;
 574         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 575                 int j;
 576                 if (!wiphy->bands[band])
 577                         continue;
 578                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
 579                         creq->channels[i] = &wiphy->bands[band]->channels[j];
 580                         i++;
 581                 }
 582         }
 583
 584         /* translate scan request */
 585         if (wrqu->data.length == sizeof(struct iw_scan_req)) {
 586                 wreq = (struct iw_scan_req *)extra;
 587
 588                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
 589                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
 590                                 return -EINVAL;
 591                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
 592                         creq->ssids[0].ssid_len = wreq->essid_len;
 593                 }
 594                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
 595                         creq->n_ssids = 0;
 596         }
 597
 598         rdev->scan_req = creq;
 599         err = rdev->ops->scan(wiphy, dev, creq);
 600         if (err) {
 601                 rdev->scan_req = NULL;
 602                 kfree(creq);
 603         }
 604  out:
 605         cfg80211_put_dev(rdev);
 606         return err;
 607 }
 608 EXPORT_SYMBOL(cfg80211_wext_siwscan);
 609
 610 static void ieee80211_scan_add_ies(struct iw_request_info *info,
 611                                    struct cfg80211_bss *bss,
 612                                    char **current_ev, char *end_buf)
 613 {
 614         u8 *pos, *end, *next;
 615         struct iw_event iwe;
 616
 617         if (!bss->information_elements ||
 618             !bss->len_information_elements)
 619                 return;
 620
 621         /*
 622          * If needed, fragment the IEs buffer (at IE boundaries) into short
 623          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
 624          */
 625         pos = bss->information_elements;
 626         end = pos + bss->len_information_elements;
 627
 628         while (end - pos > IW_GENERIC_IE_MAX) {
 629                 next = pos + 2 + pos[1];
 630                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
 631                         next = next + 2 + next[1];
 632
 633                 memset(&iwe, 0, sizeof(iwe));
 634                 iwe.cmd = IWEVGENIE;
 635                 iwe.u.data.length = next - pos;
 636                 *current_ev = iwe_stream_add_point(info, *current_ev,
 637                                                    end_buf, &iwe, pos);
 638
 639                 pos = next;
 640         }
 641
 642         if (end > pos) {
 643                 memset(&iwe, 0, sizeof(iwe));
 644                 iwe.cmd = IWEVGENIE;
 645                 iwe.u.data.length = end - pos;
 646                 *current_ev = iwe_stream_add_point(info, *current_ev,
 647                                                    end_buf, &iwe, pos);
 648         }
 649 }
 650
 651 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
 652 {
 653         unsigned long end = jiffies;
 654
 655         if (end >= start)
 656                 return jiffies_to_msecs(end - start);
 657
 658         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
 659 }
 660
 661 static char *
 662 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
 663               struct cfg80211_internal_bss *bss, char *current_ev,
 664               char *end_buf)
 665 {
 666         struct iw_event iwe;
 667         u8 *buf, *cfg, *p;
 668         u8 *ie = bss->pub.information_elements;
 669         int rem = bss->pub.len_information_elements, i, sig;
 670         bool ismesh = false;
 671
 672         memset(&iwe, 0, sizeof(iwe));
 673         iwe.cmd = SIOCGIWAP;
 674         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
 675         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
 676         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 677                                           IW_EV_ADDR_LEN);
 678
 679         memset(&iwe, 0, sizeof(iwe));
 680         iwe.cmd = SIOCGIWFREQ;
 681         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
 682         iwe.u.freq.e = 0;
 683         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 684                                           IW_EV_FREQ_LEN);
 685
 686         memset(&iwe, 0, sizeof(iwe));
 687         iwe.cmd = SIOCGIWFREQ;
 688         iwe.u.freq.m = bss->pub.channel->center_freq;
 689         iwe.u.freq.e = 6;
 690         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 691                                           IW_EV_FREQ_LEN);
 692
 693         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
 694                 memset(&iwe, 0, sizeof(iwe));
 695                 iwe.cmd = IWEVQUAL;
 696                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
 697                                      IW_QUAL_NOISE_INVALID |
 698                                      IW_QUAL_QUAL_UPDATED;
 699                 switch (wiphy->signal_type) {
 700                 case CFG80211_SIGNAL_TYPE_MBM:
 701                         sig = bss->pub.signal / 100;
 702                         iwe.u.qual.level = sig;
 703                         iwe.u.qual.updated |= IW_QUAL_DBM;
 704                         if (sig < -110)         /* rather bad */
 705                                 sig = -110;
 706                         else if (sig > -40)     /* perfect */
 707                                 sig = -40;
 708                         /* will give a range of 0 .. 70 */
 709                         iwe.u.qual.qual = sig + 110;
 710                         break;
 711                 case CFG80211_SIGNAL_TYPE_UNSPEC:
 712                         iwe.u.qual.level = bss->pub.signal;
 713                         /* will give range 0 .. 100 */
 714                         iwe.u.qual.qual = bss->pub.signal;
 715                         break;
 716                 default:
 717                         /* not reached */
 718                         break;
 719                 }
 720                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
 721                                                   &iwe, IW_EV_QUAL_LEN);
 722         }
 723
 724         memset(&iwe, 0, sizeof(iwe));
 725         iwe.cmd = SIOCGIWENCODE;
 726         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
 727                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
 728         else
 729                 iwe.u.data.flags = IW_ENCODE_DISABLED;
 730         iwe.u.data.length = 0;
 731         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 732                                           &iwe, "");
 733
 734         while (rem >= 2) {
 735                 /* invalid data */
 736                 if (ie[1] > rem - 2)
 737                         break;
 738
 739                 switch (ie[0]) {
 740                 case WLAN_EID_SSID:
 741                         memset(&iwe, 0, sizeof(iwe));
 742                         iwe.cmd = SIOCGIWESSID;
 743                         iwe.u.data.length = ie[1];
 744                         iwe.u.data.flags = 1;
 745                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 746                                                           &iwe, ie + 2);
 747                         break;
 748                 case WLAN_EID_MESH_ID:
 749                         memset(&iwe, 0, sizeof(iwe));
 750                         iwe.cmd = SIOCGIWESSID;
 751                         iwe.u.data.length = ie[1];
 752                         iwe.u.data.flags = 1;
 753                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 754                                                           &iwe, ie + 2);
 755                         break;
 756                 case WLAN_EID_MESH_CONFIG:
 757                         ismesh = true;
 758                         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
 759                                 break;
 760                         buf = kmalloc(50, GFP_ATOMIC);
 761                         if (!buf)
 762                                 break;
 763                         cfg = ie + 2;
 764                         memset(&iwe, 0, sizeof(iwe));
 765                         iwe.cmd = IWEVCUSTOM;
 766                         sprintf(buf, "Mesh network (version %d)", cfg[0]);
 767                         iwe.u.data.length = strlen(buf);
 768                         current_ev = iwe_stream_add_point(info, current_ev,
 769                                                           end_buf,
 770                                                           &iwe, buf);
 771                         sprintf(buf, "Path Selection Protocol ID: "
 772                                 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
 773                                                         cfg[4]);
 774                         iwe.u.data.length = strlen(buf);
 775                         current_ev = iwe_stream_add_point(info, current_ev,
 776                                                           end_buf,
 777                                                           &iwe, buf);
 778                         sprintf(buf, "Path Selection Metric ID: "
 779                                 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
 780                                                         cfg[8]);
 781                         iwe.u.data.length = strlen(buf);
 782                         current_ev = iwe_stream_add_point(info, current_ev,
 783                                                           end_buf,
 784                                                           &iwe, buf);
 785                         sprintf(buf, "Congestion Control Mode ID: "
 786                                 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
 787                                                         cfg[11], cfg[12]);
 788                         iwe.u.data.length = strlen(buf);
 789                         current_ev = iwe_stream_add_point(info, current_ev,
 790                                                           end_buf,
 791                                                           &iwe, buf);
 792                         sprintf(buf, "Channel Precedence: "
 793                                 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
 794                                                         cfg[15], cfg[16]);
 795                         iwe.u.data.length = strlen(buf);
 796                         current_ev = iwe_stream_add_point(info, current_ev,
 797                                                           end_buf,
 798                                                           &iwe, buf);
 799                         kfree(buf);
 800                         break;
 801                 case WLAN_EID_SUPP_RATES:
 802                 case WLAN_EID_EXT_SUPP_RATES:
 803                         /* display all supported rates in readable format */
 804                         p = current_ev + iwe_stream_lcp_len(info);
 805
 806                         memset(&iwe, 0, sizeof(iwe));
 807                         iwe.cmd = SIOCGIWRATE;
 808                         /* Those two flags are ignored... */
 809                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
 810
 811                         for (i = 0; i < ie[1]; i++) {
 812                                 iwe.u.bitrate.value =
 813                                         ((ie[i + 2] & 0x7f) * 500000);
 814                                 p = iwe_stream_add_value(info, current_ev, p,
 815                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
 816                         }
 817                         current_ev = p;
 818                         break;
 819                 }
 820                 rem -= ie[1] + 2;
 821                 ie += ie[1] + 2;
 822         }
 823
 824         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
 825             || ismesh) {
 826                 memset(&iwe, 0, sizeof(iwe));
 827                 iwe.cmd = SIOCGIWMODE;
 828                 if (ismesh)
 829                         iwe.u.mode = IW_MODE_MESH;
 830                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
 831                         iwe.u.mode = IW_MODE_MASTER;
 832                 else
 833                         iwe.u.mode = IW_MODE_ADHOC;
 834                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
 835                                                   &iwe, IW_EV_UINT_LEN);
 836         }
 837
 838         buf = kmalloc(30, GFP_ATOMIC);
 839         if (buf) {
 840                 memset(&iwe, 0, sizeof(iwe));
 841                 iwe.cmd = IWEVCUSTOM;
 842                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
 843                 iwe.u.data.length = strlen(buf);
 844                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 845                                                   &iwe, buf);
 846                 memset(&iwe, 0, sizeof(iwe));
 847                 iwe.cmd = IWEVCUSTOM;
 848                 sprintf(buf, " Last beacon: %ums ago",
 849                         elapsed_jiffies_msecs(bss->ts));
 850                 iwe.u.data.length = strlen(buf);
 851                 current_ev = iwe_stream_add_point(info, current_ev,
 852                                                   end_buf, &iwe, buf);
 853                 kfree(buf);
 854         }
 855
 856         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
 857
 858         return current_ev;
 859 }
 860
 861
 862 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
 863                                   struct iw_request_info *info,
 864                                   char *buf, size_t len)
 865 {
 866         char *current_ev = buf;
 867         char *end_buf = buf + len;
 868         struct cfg80211_internal_bss *bss;
 869
 870         spin_lock_bh(&dev->bss_lock);
 871         cfg80211_bss_expire(dev);
 872
 873         list_for_each_entry(bss, &dev->bss_list, list) {
 874                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
 875                         spin_unlock_bh(&dev->bss_lock);
 876                         return -E2BIG;
 877                 }
 878                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
 879                                            current_ev, end_buf);
 880         }
 881         spin_unlock_bh(&dev->bss_lock);
 882         return current_ev - buf;
 883 }
 884
 885
 886 int cfg80211_wext_giwscan(struct net_device *dev,
 887                           struct iw_request_info *info,
 888                           struct iw_point *data, char *extra)
 889 {
 890         struct cfg80211_registered_device *rdev;
 891         int res;
 892
 893         if (!netif_running(dev))
 894                 return -ENETDOWN;
 895
 896         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
 897
 898         if (IS_ERR(rdev))
 899                 return PTR_ERR(rdev);
 900
 901         if (rdev->scan_req) {
 902                 res = -EAGAIN;
 903                 goto out;
 904         }
 905
 906         res = ieee80211_scan_results(rdev, info, extra, data->length);
 907         data->length = 0;
 908         if (res >= 0) {
 909                 data->length = res;
 910                 res = 0;
 911         }
 912
 913  out:
 914         cfg80211_put_dev(rdev);
 915         return res;
 916 }
 917 EXPORT_SYMBOL(cfg80211_wext_giwscan);
 918 #endif