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   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         kfree(bss);
  62 }
  63
  64 /* must hold dev->bss_lock! */
  65 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
  66 {
  67         struct cfg80211_internal_bss *bss, *tmp;
  68         bool expired = false;
  69
  70         list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
  71                 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
  72                         continue;
  73                 list_del(&bss->list);
  74                 rb_erase(&bss->rbn, &dev->bss_tree);
  75                 kref_put(&bss->ref, bss_release);
  76                 expired = true;
  77         }
  78
  79         if (expired)
  80                 dev->bss_generation++;
  81 }
  82
  83 static u8 *find_ie(u8 num, u8 *ies, size_t len)
  84 {
  85         while (len > 2 && ies[0] != num) {
  86                 len -= ies[1] + 2;
  87                 ies += ies[1] + 2;
  88         }
  89         if (len < 2)
  90                 return NULL;
  91         if (len < 2 + ies[1])
  92                 return NULL;
  93         return ies;
  94 }
  95
  96 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
  97 {
  98         const u8 *ie1 = find_ie(num, ies1, len1);
  99         const u8 *ie2 = find_ie(num, ies2, len2);
 100         int r;
 101
 102         if (!ie1 && !ie2)
 103                 return 0;
 104         if (!ie1)
 105                 return -1;
 106
 107         r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
 108         if (r == 0 && ie1[1] != ie2[1])
 109                 return ie2[1] - ie1[1];
 110         return r;
 111 }
 112
 113 static bool is_bss(struct cfg80211_bss *a,
 114                    const u8 *bssid,
 115                    const u8 *ssid, size_t ssid_len)
 116 {
 117         const u8 *ssidie;
 118
 119         if (compare_ether_addr(a->bssid, bssid))
 120                 return false;
 121
 122         ssidie = find_ie(WLAN_EID_SSID,
 123                          a->information_elements,
 124                          a->len_information_elements);
 125         if (!ssidie)
 126                 return false;
 127         if (ssidie[1] != ssid_len)
 128                 return false;
 129         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
 130 }
 131
 132 static bool is_mesh(struct cfg80211_bss *a,
 133                     const u8 *meshid, size_t meshidlen,
 134                     const u8 *meshcfg)
 135 {
 136         const u8 *ie;
 137
 138         if (!is_zero_ether_addr(a->bssid))
 139                 return false;
 140
 141         ie = find_ie(WLAN_EID_MESH_ID,
 142                      a->information_elements,
 143                      a->len_information_elements);
 144         if (!ie)
 145                 return false;
 146         if (ie[1] != meshidlen)
 147                 return false;
 148         if (memcmp(ie + 2, meshid, meshidlen))
 149                 return false;
 150
 151         ie = find_ie(WLAN_EID_MESH_CONFIG,
 152                      a->information_elements,
 153                      a->len_information_elements);
 154         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
 155                 return false;
 156
 157         /*
 158          * Ignore mesh capability (last two bytes of the IE) when
 159          * comparing since that may differ between stations taking
 160          * part in the same mesh.
 161          */
 162         return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0;
 163 }
 164
 165 static int cmp_bss(struct cfg80211_bss *a,
 166                    struct cfg80211_bss *b)
 167 {
 168         int r;
 169
 170         if (a->channel != b->channel)
 171                 return b->channel->center_freq - a->channel->center_freq;
 172
 173         r = memcmp(a->bssid, b->bssid, ETH_ALEN);
 174         if (r)
 175                 return r;
 176
 177         if (is_zero_ether_addr(a->bssid)) {
 178                 r = cmp_ies(WLAN_EID_MESH_ID,
 179                             a->information_elements,
 180                             a->len_information_elements,
 181                             b->information_elements,
 182                             b->len_information_elements);
 183                 if (r)
 184                         return r;
 185                 return cmp_ies(WLAN_EID_MESH_CONFIG,
 186                                a->information_elements,
 187                                a->len_information_elements,
 188                                b->information_elements,
 189                                b->len_information_elements);
 190         }
 191
 192         return cmp_ies(WLAN_EID_SSID,
 193                        a->information_elements,
 194                        a->len_information_elements,
 195                        b->information_elements,
 196                        b->len_information_elements);
 197 }
 198
 199 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
 200                                       struct ieee80211_channel *channel,
 201                                       const u8 *bssid,
 202                                       const u8 *ssid, size_t ssid_len)
 203 {
 204         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 205         struct cfg80211_internal_bss *bss, *res = NULL;
 206
 207         spin_lock_bh(&dev->bss_lock);
 208
 209         list_for_each_entry(bss, &dev->bss_list, list) {
 210                 if (channel && bss->pub.channel != channel)
 211                         continue;
 212                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
 213                         res = bss;
 214                         kref_get(&res->ref);
 215                         break;
 216                 }
 217         }
 218
 219         spin_unlock_bh(&dev->bss_lock);
 220         if (!res)
 221                 return NULL;
 222         return &res->pub;
 223 }
 224 EXPORT_SYMBOL(cfg80211_get_bss);
 225
 226 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
 227                                        struct ieee80211_channel *channel,
 228                                        const u8 *meshid, size_t meshidlen,
 229                                        const u8 *meshcfg)
 230 {
 231         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 232         struct cfg80211_internal_bss *bss, *res = NULL;
 233
 234         spin_lock_bh(&dev->bss_lock);
 235
 236         list_for_each_entry(bss, &dev->bss_list, list) {
 237                 if (channel && bss->pub.channel != channel)
 238                         continue;
 239                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
 240                         res = bss;
 241                         kref_get(&res->ref);
 242                         break;
 243                 }
 244         }
 245
 246         spin_unlock_bh(&dev->bss_lock);
 247         if (!res)
 248                 return NULL;
 249         return &res->pub;
 250 }
 251 EXPORT_SYMBOL(cfg80211_get_mesh);
 252
 253
 254 static void rb_insert_bss(struct cfg80211_registered_device *dev,
 255                           struct cfg80211_internal_bss *bss)
 256 {
 257         struct rb_node **p = &dev->bss_tree.rb_node;
 258         struct rb_node *parent = NULL;
 259         struct cfg80211_internal_bss *tbss;
 260         int cmp;
 261
 262         while (*p) {
 263                 parent = *p;
 264                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
 265
 266                 cmp = cmp_bss(&bss->pub, &tbss->pub);
 267
 268                 if (WARN_ON(!cmp)) {
 269                         /* will sort of leak this BSS */
 270                         return;
 271                 }
 272
 273                 if (cmp < 0)
 274                         p = &(*p)->rb_left;
 275                 else
 276                         p = &(*p)->rb_right;
 277         }
 278
 279         rb_link_node(&bss->rbn, parent, p);
 280         rb_insert_color(&bss->rbn, &dev->bss_tree);
 281 }
 282
 283 static struct cfg80211_internal_bss *
 284 rb_find_bss(struct cfg80211_registered_device *dev,
 285             struct cfg80211_internal_bss *res)
 286 {
 287         struct rb_node *n = dev->bss_tree.rb_node;
 288         struct cfg80211_internal_bss *bss;
 289         int r;
 290
 291         while (n) {
 292                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
 293                 r = cmp_bss(&res->pub, &bss->pub);
 294
 295                 if (r == 0)
 296                         return bss;
 297                 else if (r < 0)
 298                         n = n->rb_left;
 299                 else
 300                         n = n->rb_right;
 301         }
 302
 303         return NULL;
 304 }
 305
 306 static struct cfg80211_internal_bss *
 307 cfg80211_bss_update(struct cfg80211_registered_device *dev,
 308                     struct cfg80211_internal_bss *res,
 309                     bool overwrite)
 310 {
 311         struct cfg80211_internal_bss *found = NULL;
 312         const u8 *meshid, *meshcfg;
 313
 314         /*
 315          * The reference to "res" is donated to this function.
 316          */
 317
 318         if (WARN_ON(!res->pub.channel)) {
 319                 kref_put(&res->ref, bss_release);
 320                 return NULL;
 321         }
 322
 323         res->ts = jiffies;
 324
 325         if (is_zero_ether_addr(res->pub.bssid)) {
 326                 /* must be mesh, verify */
 327                 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
 328                                  res->pub.len_information_elements);
 329                 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
 330                                   res->pub.information_elements,
 331                                   res->pub.len_information_elements);
 332                 if (!meshid || !meshcfg ||
 333                     meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) {
 334                         /* bogus mesh */
 335                         kref_put(&res->ref, bss_release);
 336                         return NULL;
 337                 }
 338         }
 339
 340         spin_lock_bh(&dev->bss_lock);
 341
 342         found = rb_find_bss(dev, res);
 343
 344         if (found && overwrite) {
 345                 list_replace(&found->list, &res->list);
 346                 rb_replace_node(&found->rbn, &res->rbn,
 347                                 &dev->bss_tree);
 348                 kref_put(&found->ref, bss_release);
 349                 found = res;
 350         } else if (found) {
 351                 kref_get(&found->ref);
 352                 found->pub.beacon_interval = res->pub.beacon_interval;
 353                 found->pub.tsf = res->pub.tsf;
 354                 found->pub.signal = res->pub.signal;
 355                 found->pub.signal_type = res->pub.signal_type;
 356                 found->pub.capability = res->pub.capability;
 357                 found->ts = res->ts;
 358                 kref_put(&res->ref, bss_release);
 359         } else {
 360                 /* this "consumes" the reference */
 361                 list_add_tail(&res->list, &dev->bss_list);
 362                 rb_insert_bss(dev, res);
 363                 found = res;
 364         }
 365
 366         dev->bss_generation++;
 367         spin_unlock_bh(&dev->bss_lock);
 368
 369         kref_get(&found->ref);
 370         return found;
 371 }
 372
 373 struct cfg80211_bss *
 374 cfg80211_inform_bss_frame(struct wiphy *wiphy,
 375                           struct ieee80211_channel *channel,
 376                           struct ieee80211_mgmt *mgmt, size_t len,
 377                           s32 signal, enum cfg80211_signal_type sigtype,
 378                           gfp_t gfp)
 379 {
 380         struct cfg80211_internal_bss *res;
 381         size_t ielen = len - offsetof(struct ieee80211_mgmt,
 382                                       u.probe_resp.variable);
 383         bool overwrite;
 384         size_t privsz = wiphy->bss_priv_size;
 385
 386         if (WARN_ON(sigtype == NL80211_BSS_SIGNAL_UNSPEC &&
 387                     (signal < 0 || signal > 100)))
 388                 return NULL;
 389
 390         if (WARN_ON(!mgmt || !wiphy ||
 391                     len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
 392                 return NULL;
 393
 394         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
 395         if (!res)
 396                 return NULL;
 397
 398         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
 399         res->pub.channel = channel;
 400         res->pub.signal_type = sigtype;
 401         res->pub.signal = signal;
 402         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
 403         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
 404         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
 405         /* point to after the private area */
 406         res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
 407         memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
 408         res->pub.len_information_elements = ielen;
 409
 410         kref_init(&res->ref);
 411
 412         overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
 413
 414         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
 415         if (!res)
 416                 return NULL;
 417
 418         /* cfg80211_bss_update gives us a referenced result */
 419         return &res->pub;
 420 }
 421 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
 422
 423 void cfg80211_put_bss(struct cfg80211_bss *pub)
 424 {
 425         struct cfg80211_internal_bss *bss;
 426
 427         if (!pub)
 428                 return;
 429
 430         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 431         kref_put(&bss->ref, bss_release);
 432 }
 433 EXPORT_SYMBOL(cfg80211_put_bss);
 434
 435 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 436 {
 437         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 438         struct cfg80211_internal_bss *bss;
 439
 440         if (WARN_ON(!pub))
 441                 return;
 442
 443         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 444
 445         spin_lock_bh(&dev->bss_lock);
 446
 447         list_del(&bss->list);
 448         rb_erase(&bss->rbn, &dev->bss_tree);
 449
 450         spin_unlock_bh(&dev->bss_lock);
 451
 452         kref_put(&bss->ref, bss_release);
 453 }
 454 EXPORT_SYMBOL(cfg80211_unlink_bss);
 455
 456 #ifdef CONFIG_WIRELESS_EXT
 457 int cfg80211_wext_siwscan(struct net_device *dev,
 458                           struct iw_request_info *info,
 459                           union iwreq_data *wrqu, char *extra)
 460 {
 461         struct cfg80211_registered_device *rdev;
 462         struct wiphy *wiphy;
 463         struct iw_scan_req *wreq = NULL;
 464         struct cfg80211_scan_request *creq;
 465         int i, err, n_channels = 0;
 466         enum ieee80211_band band;
 467
 468         if (!netif_running(dev))
 469                 return -ENETDOWN;
 470
 471         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
 472
 473         if (IS_ERR(rdev))
 474                 return PTR_ERR(rdev);
 475
 476         if (rdev->scan_req) {
 477                 err = -EBUSY;
 478                 goto out;
 479         }
 480
 481         wiphy = &rdev->wiphy;
 482
 483         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 484                 if (wiphy->bands[band])
 485                         n_channels += wiphy->bands[band]->n_channels;
 486
 487         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
 488                        n_channels * sizeof(void *),
 489                        GFP_ATOMIC);
 490         if (!creq) {
 491                 err = -ENOMEM;
 492                 goto out;
 493         }
 494
 495         creq->wiphy = wiphy;
 496         creq->ifidx = dev->ifindex;
 497         creq->ssids = (void *)(creq + 1);
 498         creq->channels = (void *)(creq->ssids + 1);
 499         creq->n_channels = n_channels;
 500         creq->n_ssids = 1;
 501
 502         /* all channels */
 503         i = 0;
 504         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 505                 int j;
 506                 if (!wiphy->bands[band])
 507                         continue;
 508                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
 509                         creq->channels[i] = &wiphy->bands[band]->channels[j];
 510                         i++;
 511                 }
 512         }
 513
 514         /* translate scan request */
 515         if (wrqu->data.length == sizeof(struct iw_scan_req)) {
 516                 wreq = (struct iw_scan_req *)extra;
 517
 518                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
 519                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
 520                                 return -EINVAL;
 521                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
 522                         creq->ssids[0].ssid_len = wreq->essid_len;
 523                 }
 524                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
 525                         creq->n_ssids = 0;
 526         }
 527
 528         rdev->scan_req = creq;
 529         err = rdev->ops->scan(wiphy, dev, creq);
 530         if (err) {
 531                 rdev->scan_req = NULL;
 532                 kfree(creq);
 533         }
 534  out:
 535         cfg80211_put_dev(rdev);
 536         return err;
 537 }
 538 EXPORT_SYMBOL(cfg80211_wext_siwscan);
 539
 540 static void ieee80211_scan_add_ies(struct iw_request_info *info,
 541                                    struct cfg80211_bss *bss,
 542                                    char **current_ev, char *end_buf)
 543 {
 544         u8 *pos, *end, *next;
 545         struct iw_event iwe;
 546
 547         if (!bss->information_elements ||
 548             !bss->len_information_elements)
 549                 return;
 550
 551         /*
 552          * If needed, fragment the IEs buffer (at IE boundaries) into short
 553          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
 554          */
 555         pos = bss->information_elements;
 556         end = pos + bss->len_information_elements;
 557
 558         while (end - pos > IW_GENERIC_IE_MAX) {
 559                 next = pos + 2 + pos[1];
 560                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
 561                         next = next + 2 + next[1];
 562
 563                 memset(&iwe, 0, sizeof(iwe));
 564                 iwe.cmd = IWEVGENIE;
 565                 iwe.u.data.length = next - pos;
 566                 *current_ev = iwe_stream_add_point(info, *current_ev,
 567                                                    end_buf, &iwe, pos);
 568
 569                 pos = next;
 570         }
 571
 572         if (end > pos) {
 573                 memset(&iwe, 0, sizeof(iwe));
 574                 iwe.cmd = IWEVGENIE;
 575                 iwe.u.data.length = end - pos;
 576                 *current_ev = iwe_stream_add_point(info, *current_ev,
 577                                                    end_buf, &iwe, pos);
 578         }
 579 }
 580
 581
 582 static char *
 583 ieee80211_bss(struct iw_request_info *info,
 584                       struct cfg80211_internal_bss *bss,
 585                       char *current_ev, char *end_buf)
 586 {
 587         struct iw_event iwe;
 588         u8 *buf, *cfg, *p;
 589         u8 *ie = bss->pub.information_elements;
 590         int rem = bss->pub.len_information_elements, i;
 591         bool ismesh = false;
 592
 593         memset(&iwe, 0, sizeof(iwe));
 594         iwe.cmd = SIOCGIWAP;
 595         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
 596         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
 597         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 598                                           IW_EV_ADDR_LEN);
 599
 600         memset(&iwe, 0, sizeof(iwe));
 601         iwe.cmd = SIOCGIWFREQ;
 602         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
 603         iwe.u.freq.e = 0;
 604         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 605                                           IW_EV_FREQ_LEN);
 606
 607         memset(&iwe, 0, sizeof(iwe));
 608         iwe.cmd = SIOCGIWFREQ;
 609         iwe.u.freq.m = bss->pub.channel->center_freq;
 610         iwe.u.freq.e = 6;
 611         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 612                                           IW_EV_FREQ_LEN);
 613
 614         if (bss->pub.signal_type != CFG80211_SIGNAL_TYPE_NONE) {
 615                 memset(&iwe, 0, sizeof(iwe));
 616                 iwe.cmd = IWEVQUAL;
 617                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
 618                                      IW_QUAL_NOISE_INVALID |
 619                                      IW_QUAL_QUAL_INVALID;
 620                 switch (bss->pub.signal_type) {
 621                 case CFG80211_SIGNAL_TYPE_MBM:
 622                         iwe.u.qual.level = bss->pub.signal / 100;
 623                         iwe.u.qual.updated |= IW_QUAL_DBM;
 624                         break;
 625                 case CFG80211_SIGNAL_TYPE_UNSPEC:
 626                         iwe.u.qual.level = bss->pub.signal;
 627                         break;
 628                 default:
 629                         /* not reached */
 630                         break;
 631                 }
 632                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
 633                                                   &iwe, IW_EV_QUAL_LEN);
 634         }
 635
 636         memset(&iwe, 0, sizeof(iwe));
 637         iwe.cmd = SIOCGIWENCODE;
 638         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
 639                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
 640         else
 641                 iwe.u.data.flags = IW_ENCODE_DISABLED;
 642         iwe.u.data.length = 0;
 643         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 644                                           &iwe, "");
 645
 646         while (rem >= 2) {
 647                 /* invalid data */
 648                 if (ie[1] > rem - 2)
 649                         break;
 650
 651                 switch (ie[0]) {
 652                 case WLAN_EID_SSID:
 653                         memset(&iwe, 0, sizeof(iwe));
 654                         iwe.cmd = SIOCGIWESSID;
 655                         iwe.u.data.length = ie[1];
 656                         iwe.u.data.flags = 1;
 657                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 658                                                           &iwe, ie + 2);
 659                         break;
 660                 case WLAN_EID_MESH_ID:
 661                         memset(&iwe, 0, sizeof(iwe));
 662                         iwe.cmd = SIOCGIWESSID;
 663                         iwe.u.data.length = ie[1];
 664                         iwe.u.data.flags = 1;
 665                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 666                                                           &iwe, ie + 2);
 667                         break;
 668                 case WLAN_EID_MESH_CONFIG:
 669                         ismesh = true;
 670                         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
 671                                 break;
 672                         buf = kmalloc(50, GFP_ATOMIC);
 673                         if (!buf)
 674                                 break;
 675                         cfg = ie + 2;
 676                         memset(&iwe, 0, sizeof(iwe));
 677                         iwe.cmd = IWEVCUSTOM;
 678                         sprintf(buf, "Mesh network (version %d)", cfg[0]);
 679                         iwe.u.data.length = strlen(buf);
 680                         current_ev = iwe_stream_add_point(info, current_ev,
 681                                                           end_buf,
 682                                                           &iwe, buf);
 683                         sprintf(buf, "Path Selection Protocol ID: "
 684                                 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
 685                                                         cfg[4]);
 686                         iwe.u.data.length = strlen(buf);
 687                         current_ev = iwe_stream_add_point(info, current_ev,
 688                                                           end_buf,
 689                                                           &iwe, buf);
 690                         sprintf(buf, "Path Selection Metric ID: "
 691                                 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
 692                                                         cfg[8]);
 693                         iwe.u.data.length = strlen(buf);
 694                         current_ev = iwe_stream_add_point(info, current_ev,
 695                                                           end_buf,
 696                                                           &iwe, buf);
 697                         sprintf(buf, "Congestion Control Mode ID: "
 698                                 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
 699                                                         cfg[11], cfg[12]);
 700                         iwe.u.data.length = strlen(buf);
 701                         current_ev = iwe_stream_add_point(info, current_ev,
 702                                                           end_buf,
 703                                                           &iwe, buf);
 704                         sprintf(buf, "Channel Precedence: "
 705                                 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
 706                                                         cfg[15], cfg[16]);
 707                         iwe.u.data.length = strlen(buf);
 708                         current_ev = iwe_stream_add_point(info, current_ev,
 709                                                           end_buf,
 710                                                           &iwe, buf);
 711                         kfree(buf);
 712                         break;
 713                 case WLAN_EID_SUPP_RATES:
 714                 case WLAN_EID_EXT_SUPP_RATES:
 715                         /* display all supported rates in readable format */
 716                         p = current_ev + iwe_stream_lcp_len(info);
 717
 718                         memset(&iwe, 0, sizeof(iwe));
 719                         iwe.cmd = SIOCGIWRATE;
 720                         /* Those two flags are ignored... */
 721                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
 722
 723                         for (i = 0; i < ie[1]; i++) {
 724                                 iwe.u.bitrate.value =
 725                                         ((ie[i + 2] & 0x7f) * 500000);
 726                                 p = iwe_stream_add_value(info, current_ev, p,
 727                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
 728                         }
 729                         current_ev = p;
 730                         break;
 731                 }
 732                 rem -= ie[1] + 2;
 733                 ie += ie[1] + 2;
 734         }
 735
 736         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
 737             || ismesh) {
 738                 memset(&iwe, 0, sizeof(iwe));
 739                 iwe.cmd = SIOCGIWMODE;
 740                 if (ismesh)
 741                         iwe.u.mode = IW_MODE_MESH;
 742                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
 743                         iwe.u.mode = IW_MODE_MASTER;
 744                 else
 745                         iwe.u.mode = IW_MODE_ADHOC;
 746                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
 747                                                   &iwe, IW_EV_UINT_LEN);
 748         }
 749
 750         buf = kmalloc(30, GFP_ATOMIC);
 751         if (buf) {
 752                 memset(&iwe, 0, sizeof(iwe));
 753                 iwe.cmd = IWEVCUSTOM;
 754                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
 755                 iwe.u.data.length = strlen(buf);
 756                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 757                                                   &iwe, buf);
 758                 memset(&iwe, 0, sizeof(iwe));
 759                 iwe.cmd = IWEVCUSTOM;
 760                 sprintf(buf, " Last beacon: %dms ago",
 761                         jiffies_to_msecs(jiffies - bss->ts));
 762                 iwe.u.data.length = strlen(buf);
 763                 current_ev = iwe_stream_add_point(info, current_ev,
 764                                                   end_buf, &iwe, buf);
 765                 kfree(buf);
 766         }
 767
 768         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
 769
 770         return current_ev;
 771 }
 772
 773
 774 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
 775                                   struct iw_request_info *info,
 776                                   char *buf, size_t len)
 777 {
 778         char *current_ev = buf;
 779         char *end_buf = buf + len;
 780         struct cfg80211_internal_bss *bss;
 781
 782         spin_lock_bh(&dev->bss_lock);
 783         cfg80211_bss_expire(dev);
 784
 785         list_for_each_entry(bss, &dev->bss_list, list) {
 786                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
 787                         spin_unlock_bh(&dev->bss_lock);
 788                         return -E2BIG;
 789                 }
 790                 current_ev = ieee80211_bss(info, bss,
 791                                                    current_ev, end_buf);
 792         }
 793         spin_unlock_bh(&dev->bss_lock);
 794         return current_ev - buf;
 795 }
 796
 797
 798 int cfg80211_wext_giwscan(struct net_device *dev,
 799                           struct iw_request_info *info,
 800                           struct iw_point *data, char *extra)
 801 {
 802         struct cfg80211_registered_device *rdev;
 803         int res;
 804
 805         if (!netif_running(dev))
 806                 return -ENETDOWN;
 807
 808         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
 809
 810         if (IS_ERR(rdev))
 811                 return PTR_ERR(rdev);
 812
 813         if (rdev->scan_req) {
 814                 res = -EAGAIN;
 815                 goto out;
 816         }
 817
 818         res = ieee80211_scan_results(rdev, info, extra, data->length);
 819         data->length = 0;
 820         if (res >= 0) {
 821                 data->length = res;
 822                 res = 0;
 823         }
 824
 825  out:
 826         cfg80211_put_dev(rdev);
 827         return res;
 828 }
 829 EXPORT_SYMBOL(cfg80211_wext_giwscan);
 830 #endif