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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         kfree(bss);
  60 }
  61
  62 /* must hold dev->bss_lock! */
  63 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
  64 {
  65         struct cfg80211_internal_bss *bss, *tmp;
  66         bool expired = false;
  67
  68         list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
  69                 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
  70                         continue;
  71                 list_del(&bss->list);
  72                 rb_erase(&bss->rbn, &dev->bss_tree);
  73                 kref_put(&bss->ref, bss_release);
  74                 expired = true;
  75         }
  76
  77         if (expired)
  78                 dev->bss_generation++;
  79 }
  80
  81 static u8 *find_ie(u8 num, u8 *ies, size_t len)
  82 {
  83         while (len > 2 && ies[0] != num) {
  84                 len -= ies[1] + 2;
  85                 ies += ies[1] + 2;
  86         }
  87         if (len < 2)
  88                 return NULL;
  89         if (len < 2 + ies[1])
  90                 return NULL;
  91         return ies;
  92 }
  93
  94 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
  95 {
  96         const u8 *ie1 = find_ie(num, ies1, len1);
  97         const u8 *ie2 = find_ie(num, ies2, len2);
  98         int r;
  99
 100         if (!ie1 && !ie2)
 101                 return 0;
 102         if (!ie1)
 103                 return -1;
 104
 105         r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
 106         if (r == 0 && ie1[1] != ie2[1])
 107                 return ie2[1] - ie1[1];
 108         return r;
 109 }
 110
 111 static bool is_bss(struct cfg80211_bss *a,
 112                    const u8 *bssid,
 113                    const u8 *ssid, size_t ssid_len)
 114 {
 115         const u8 *ssidie;
 116
 117         if (compare_ether_addr(a->bssid, bssid))
 118                 return false;
 119
 120         ssidie = find_ie(WLAN_EID_SSID,
 121                          a->information_elements,
 122                          a->len_information_elements);
 123         if (!ssidie)
 124                 return false;
 125         if (ssidie[1] != ssid_len)
 126                 return false;
 127         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
 128 }
 129
 130 static bool is_mesh(struct cfg80211_bss *a,
 131                     const u8 *meshid, size_t meshidlen,
 132                     const u8 *meshcfg)
 133 {
 134         const u8 *ie;
 135
 136         if (!is_zero_ether_addr(a->bssid))
 137                 return false;
 138
 139         ie = find_ie(WLAN_EID_MESH_ID,
 140                      a->information_elements,
 141                      a->len_information_elements);
 142         if (!ie)
 143                 return false;
 144         if (ie[1] != meshidlen)
 145                 return false;
 146         if (memcmp(ie + 2, meshid, meshidlen))
 147                 return false;
 148
 149         ie = find_ie(WLAN_EID_MESH_CONFIG,
 150                      a->information_elements,
 151                      a->len_information_elements);
 152         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
 153                 return false;
 154
 155         /*
 156          * Ignore mesh capability (last two bytes of the IE) when
 157          * comparing since that may differ between stations taking
 158          * part in the same mesh.
 159          */
 160         return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0;
 161 }
 162
 163 static int cmp_bss(struct cfg80211_bss *a,
 164                    struct cfg80211_bss *b)
 165 {
 166         int r;
 167
 168         if (a->channel != b->channel)
 169                 return b->channel->center_freq - a->channel->center_freq;
 170
 171         r = memcmp(a->bssid, b->bssid, ETH_ALEN);
 172         if (r)
 173                 return r;
 174
 175         if (is_zero_ether_addr(a->bssid)) {
 176                 r = cmp_ies(WLAN_EID_MESH_ID,
 177                             a->information_elements,
 178                             a->len_information_elements,
 179                             b->information_elements,
 180                             b->len_information_elements);
 181                 if (r)
 182                         return r;
 183                 return cmp_ies(WLAN_EID_MESH_CONFIG,
 184                                a->information_elements,
 185                                a->len_information_elements,
 186                                b->information_elements,
 187                                b->len_information_elements);
 188         }
 189
 190         return cmp_ies(WLAN_EID_SSID,
 191                        a->information_elements,
 192                        a->len_information_elements,
 193                        b->information_elements,
 194                        b->len_information_elements);
 195 }
 196
 197 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
 198                                       struct ieee80211_channel *channel,
 199                                       const u8 *bssid,
 200                                       const u8 *ssid, size_t ssid_len)
 201 {
 202         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 203         struct cfg80211_internal_bss *bss, *res = NULL;
 204
 205         spin_lock_bh(&dev->bss_lock);
 206
 207         list_for_each_entry(bss, &dev->bss_list, list) {
 208                 if (channel && bss->pub.channel != channel)
 209                         continue;
 210                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
 211                         res = bss;
 212                         kref_get(&res->ref);
 213                         break;
 214                 }
 215         }
 216
 217         spin_unlock_bh(&dev->bss_lock);
 218         if (!res)
 219                 return NULL;
 220         return &res->pub;
 221 }
 222 EXPORT_SYMBOL(cfg80211_get_bss);
 223
 224 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
 225                                        struct ieee80211_channel *channel,
 226                                        const u8 *meshid, size_t meshidlen,
 227                                        const u8 *meshcfg)
 228 {
 229         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 230         struct cfg80211_internal_bss *bss, *res = NULL;
 231
 232         spin_lock_bh(&dev->bss_lock);
 233
 234         list_for_each_entry(bss, &dev->bss_list, list) {
 235                 if (channel && bss->pub.channel != channel)
 236                         continue;
 237                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
 238                         res = bss;
 239                         kref_get(&res->ref);
 240                         break;
 241                 }
 242         }
 243
 244         spin_unlock_bh(&dev->bss_lock);
 245         if (!res)
 246                 return NULL;
 247         return &res->pub;
 248 }
 249 EXPORT_SYMBOL(cfg80211_get_mesh);
 250
 251
 252 static void rb_insert_bss(struct cfg80211_registered_device *dev,
 253                           struct cfg80211_internal_bss *bss)
 254 {
 255         struct rb_node **p = &dev->bss_tree.rb_node;
 256         struct rb_node *parent = NULL;
 257         struct cfg80211_internal_bss *tbss;
 258         int cmp;
 259
 260         while (*p) {
 261                 parent = *p;
 262                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
 263
 264                 cmp = cmp_bss(&bss->pub, &tbss->pub);
 265
 266                 if (WARN_ON(!cmp)) {
 267                         /* will sort of leak this BSS */
 268                         return;
 269                 }
 270
 271                 if (cmp < 0)
 272                         p = &(*p)->rb_left;
 273                 else
 274                         p = &(*p)->rb_right;
 275         }
 276
 277         rb_link_node(&bss->rbn, parent, p);
 278         rb_insert_color(&bss->rbn, &dev->bss_tree);
 279 }
 280
 281 static struct cfg80211_internal_bss *
 282 rb_find_bss(struct cfg80211_registered_device *dev,
 283             struct cfg80211_internal_bss *res)
 284 {
 285         struct rb_node *n = dev->bss_tree.rb_node;
 286         struct cfg80211_internal_bss *bss;
 287         int r;
 288
 289         while (n) {
 290                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
 291                 r = cmp_bss(&res->pub, &bss->pub);
 292
 293                 if (r == 0)
 294                         return bss;
 295                 else if (r < 0)
 296                         n = n->rb_left;
 297                 else
 298                         n = n->rb_right;
 299         }
 300
 301         return NULL;
 302 }
 303
 304 static struct cfg80211_internal_bss *
 305 cfg80211_bss_update(struct cfg80211_registered_device *dev,
 306                     struct cfg80211_internal_bss *res,
 307                     bool overwrite)
 308 {
 309         struct cfg80211_internal_bss *found = NULL;
 310         const u8 *meshid, *meshcfg;
 311
 312         /*
 313          * The reference to "res" is donated to this function.
 314          */
 315
 316         if (WARN_ON(!res->pub.channel)) {
 317                 kref_put(&res->ref, bss_release);
 318                 return NULL;
 319         }
 320
 321         res->ts = jiffies;
 322
 323         if (is_zero_ether_addr(res->pub.bssid)) {
 324                 /* must be mesh, verify */
 325                 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
 326                                  res->pub.len_information_elements);
 327                 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
 328                                   res->pub.information_elements,
 329                                   res->pub.len_information_elements);
 330                 if (!meshid || !meshcfg ||
 331                     meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) {
 332                         /* bogus mesh */
 333                         kref_put(&res->ref, bss_release);
 334                         return NULL;
 335                 }
 336         }
 337
 338         spin_lock_bh(&dev->bss_lock);
 339
 340         found = rb_find_bss(dev, res);
 341
 342         if (found && overwrite) {
 343                 list_replace(&found->list, &res->list);
 344                 rb_replace_node(&found->rbn, &res->rbn,
 345                                 &dev->bss_tree);
 346                 kref_put(&found->ref, bss_release);
 347                 found = res;
 348         } else if (found) {
 349                 kref_get(&found->ref);
 350                 found->pub.beacon_interval = res->pub.beacon_interval;
 351                 found->pub.tsf = res->pub.tsf;
 352                 found->pub.signal = res->pub.signal;
 353                 found->pub.signal_type = res->pub.signal_type;
 354                 found->pub.capability = res->pub.capability;
 355                 found->ts = res->ts;
 356                 kref_put(&res->ref, bss_release);
 357         } else {
 358                 /* this "consumes" the reference */
 359                 list_add_tail(&res->list, &dev->bss_list);
 360                 rb_insert_bss(dev, res);
 361                 found = res;
 362         }
 363
 364         dev->bss_generation++;
 365         spin_unlock_bh(&dev->bss_lock);
 366
 367         kref_get(&found->ref);
 368         return found;
 369 }
 370
 371 struct cfg80211_bss *
 372 cfg80211_inform_bss_frame(struct wiphy *wiphy,
 373                           struct ieee80211_channel *channel,
 374                           struct ieee80211_mgmt *mgmt, size_t len,
 375                           s32 signal, enum cfg80211_signal_type sigtype,
 376                           gfp_t gfp)
 377 {
 378         struct cfg80211_internal_bss *res;
 379         size_t ielen = len - offsetof(struct ieee80211_mgmt,
 380                                       u.probe_resp.variable);
 381         bool overwrite;
 382         size_t privsz = wiphy->bss_priv_size;
 383
 384         if (WARN_ON(sigtype == NL80211_BSS_SIGNAL_UNSPEC &&
 385                     (signal < 0 || signal > 100)))
 386                 return NULL;
 387
 388         if (WARN_ON(!mgmt || !wiphy ||
 389                     len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
 390                 return NULL;
 391
 392         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
 393         if (!res)
 394                 return NULL;
 395
 396         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
 397         res->pub.channel = channel;
 398         res->pub.signal_type = sigtype;
 399         res->pub.signal = signal;
 400         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
 401         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
 402         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
 403         /* point to after the private area */
 404         res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
 405         memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
 406         res->pub.len_information_elements = ielen;
 407
 408         kref_init(&res->ref);
 409
 410         overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
 411
 412         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
 413         if (!res)
 414                 return NULL;
 415
 416         /* cfg80211_bss_update gives us a referenced result */
 417         return &res->pub;
 418 }
 419 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
 420
 421 void cfg80211_put_bss(struct cfg80211_bss *pub)
 422 {
 423         struct cfg80211_internal_bss *bss;
 424
 425         if (!pub)
 426                 return;
 427
 428         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 429         kref_put(&bss->ref, bss_release);
 430 }
 431 EXPORT_SYMBOL(cfg80211_put_bss);
 432
 433 #ifdef CONFIG_WIRELESS_EXT
 434 int cfg80211_wext_siwscan(struct net_device *dev,
 435                           struct iw_request_info *info,
 436                           union iwreq_data *wrqu, char *extra)
 437 {
 438         struct cfg80211_registered_device *rdev;
 439         struct wiphy *wiphy;
 440         struct iw_scan_req *wreq = NULL;
 441         struct cfg80211_scan_request *creq;
 442         int i, err, n_channels = 0;
 443         enum ieee80211_band band;
 444
 445         if (!netif_running(dev))
 446                 return -ENETDOWN;
 447
 448         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
 449
 450         if (IS_ERR(rdev))
 451                 return PTR_ERR(rdev);
 452
 453         if (rdev->scan_req) {
 454                 err = -EBUSY;
 455                 goto out;
 456         }
 457
 458         wiphy = &rdev->wiphy;
 459
 460         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 461                 if (wiphy->bands[band])
 462                         n_channels += wiphy->bands[band]->n_channels;
 463
 464         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
 465                        n_channels * sizeof(void *),
 466                        GFP_ATOMIC);
 467         if (!creq) {
 468                 err = -ENOMEM;
 469                 goto out;
 470         }
 471
 472         creq->wiphy = wiphy;
 473         creq->ifidx = dev->ifindex;
 474         creq->ssids = (void *)(creq + 1);
 475         creq->channels = (void *)(creq->ssids + 1);
 476         creq->n_channels = n_channels;
 477         creq->n_ssids = 1;
 478
 479         /* all channels */
 480         i = 0;
 481         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 482                 int j;
 483                 if (!wiphy->bands[band])
 484                         continue;
 485                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
 486                         creq->channels[i] = &wiphy->bands[band]->channels[j];
 487                         i++;
 488                 }
 489         }
 490
 491         /* translate scan request */
 492         if (wrqu->data.length == sizeof(struct iw_scan_req)) {
 493                 wreq = (struct iw_scan_req *)extra;
 494
 495                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
 496                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
 497                                 return -EINVAL;
 498                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
 499                         creq->ssids[0].ssid_len = wreq->essid_len;
 500                 }
 501                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
 502                         creq->n_ssids = 0;
 503         }
 504
 505         rdev->scan_req = creq;
 506         err = rdev->ops->scan(wiphy, dev, creq);
 507         if (err) {
 508                 rdev->scan_req = NULL;
 509                 kfree(creq);
 510         }
 511  out:
 512         cfg80211_put_dev(rdev);
 513         return err;
 514 }
 515 EXPORT_SYMBOL(cfg80211_wext_siwscan);
 516
 517 static void ieee80211_scan_add_ies(struct iw_request_info *info,
 518                                    struct cfg80211_bss *bss,
 519                                    char **current_ev, char *end_buf)
 520 {
 521         u8 *pos, *end, *next;
 522         struct iw_event iwe;
 523
 524         if (!bss->information_elements ||
 525             !bss->len_information_elements)
 526                 return;
 527
 528         /*
 529          * If needed, fragment the IEs buffer (at IE boundaries) into short
 530          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
 531          */
 532         pos = bss->information_elements;
 533         end = pos + bss->len_information_elements;
 534
 535         while (end - pos > IW_GENERIC_IE_MAX) {
 536                 next = pos + 2 + pos[1];
 537                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
 538                         next = next + 2 + next[1];
 539
 540                 memset(&iwe, 0, sizeof(iwe));
 541                 iwe.cmd = IWEVGENIE;
 542                 iwe.u.data.length = next - pos;
 543                 *current_ev = iwe_stream_add_point(info, *current_ev,
 544                                                    end_buf, &iwe, pos);
 545
 546                 pos = next;
 547         }
 548
 549         if (end > pos) {
 550                 memset(&iwe, 0, sizeof(iwe));
 551                 iwe.cmd = IWEVGENIE;
 552                 iwe.u.data.length = end - pos;
 553                 *current_ev = iwe_stream_add_point(info, *current_ev,
 554                                                    end_buf, &iwe, pos);
 555         }
 556 }
 557
 558
 559 static char *
 560 ieee80211_bss(struct iw_request_info *info,
 561                       struct cfg80211_internal_bss *bss,
 562                       char *current_ev, char *end_buf)
 563 {
 564         struct iw_event iwe;
 565         u8 *buf, *cfg, *p;
 566         u8 *ie = bss->pub.information_elements;
 567         int rem = bss->pub.len_information_elements, i;
 568         bool ismesh = false;
 569
 570         memset(&iwe, 0, sizeof(iwe));
 571         iwe.cmd = SIOCGIWAP;
 572         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
 573         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
 574         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 575                                           IW_EV_ADDR_LEN);
 576
 577         memset(&iwe, 0, sizeof(iwe));
 578         iwe.cmd = SIOCGIWFREQ;
 579         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
 580         iwe.u.freq.e = 0;
 581         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 582                                           IW_EV_FREQ_LEN);
 583
 584         memset(&iwe, 0, sizeof(iwe));
 585         iwe.cmd = SIOCGIWFREQ;
 586         iwe.u.freq.m = bss->pub.channel->center_freq;
 587         iwe.u.freq.e = 6;
 588         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 589                                           IW_EV_FREQ_LEN);
 590
 591         if (bss->pub.signal_type != CFG80211_SIGNAL_TYPE_NONE) {
 592                 memset(&iwe, 0, sizeof(iwe));
 593                 iwe.cmd = IWEVQUAL;
 594                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
 595                                      IW_QUAL_NOISE_INVALID |
 596                                      IW_QUAL_QUAL_INVALID;
 597                 switch (bss->pub.signal_type) {
 598                 case CFG80211_SIGNAL_TYPE_MBM:
 599                         iwe.u.qual.level = bss->pub.signal / 100;
 600                         iwe.u.qual.updated |= IW_QUAL_DBM;
 601                         break;
 602                 case CFG80211_SIGNAL_TYPE_UNSPEC:
 603                         iwe.u.qual.level = bss->pub.signal;
 604                         break;
 605                 default:
 606                         /* not reached */
 607                         break;
 608                 }
 609                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
 610                                                   &iwe, IW_EV_QUAL_LEN);
 611         }
 612
 613         memset(&iwe, 0, sizeof(iwe));
 614         iwe.cmd = SIOCGIWENCODE;
 615         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
 616                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
 617         else
 618                 iwe.u.data.flags = IW_ENCODE_DISABLED;
 619         iwe.u.data.length = 0;
 620         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 621                                           &iwe, "");
 622
 623         while (rem >= 2) {
 624                 /* invalid data */
 625                 if (ie[1] > rem - 2)
 626                         break;
 627
 628                 switch (ie[0]) {
 629                 case WLAN_EID_SSID:
 630                         memset(&iwe, 0, sizeof(iwe));
 631                         iwe.cmd = SIOCGIWESSID;
 632                         iwe.u.data.length = ie[1];
 633                         iwe.u.data.flags = 1;
 634                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 635                                                           &iwe, ie + 2);
 636                         break;
 637                 case WLAN_EID_MESH_ID:
 638                         memset(&iwe, 0, sizeof(iwe));
 639                         iwe.cmd = SIOCGIWESSID;
 640                         iwe.u.data.length = ie[1];
 641                         iwe.u.data.flags = 1;
 642                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 643                                                           &iwe, ie + 2);
 644                         break;
 645                 case WLAN_EID_MESH_CONFIG:
 646                         ismesh = true;
 647                         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
 648                                 break;
 649                         buf = kmalloc(50, GFP_ATOMIC);
 650                         if (!buf)
 651                                 break;
 652                         cfg = ie + 2;
 653                         memset(&iwe, 0, sizeof(iwe));
 654                         iwe.cmd = IWEVCUSTOM;
 655                         sprintf(buf, "Mesh network (version %d)", cfg[0]);
 656                         iwe.u.data.length = strlen(buf);
 657                         current_ev = iwe_stream_add_point(info, current_ev,
 658                                                           end_buf,
 659                                                           &iwe, buf);
 660                         sprintf(buf, "Path Selection Protocol ID: "
 661                                 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
 662                                                         cfg[4]);
 663                         iwe.u.data.length = strlen(buf);
 664                         current_ev = iwe_stream_add_point(info, current_ev,
 665                                                           end_buf,
 666                                                           &iwe, buf);
 667                         sprintf(buf, "Path Selection Metric ID: "
 668                                 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
 669                                                         cfg[8]);
 670                         iwe.u.data.length = strlen(buf);
 671                         current_ev = iwe_stream_add_point(info, current_ev,
 672                                                           end_buf,
 673                                                           &iwe, buf);
 674                         sprintf(buf, "Congestion Control Mode ID: "
 675                                 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
 676                                                         cfg[11], cfg[12]);
 677                         iwe.u.data.length = strlen(buf);
 678                         current_ev = iwe_stream_add_point(info, current_ev,
 679                                                           end_buf,
 680                                                           &iwe, buf);
 681                         sprintf(buf, "Channel Precedence: "
 682                                 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
 683                                                         cfg[15], cfg[16]);
 684                         iwe.u.data.length = strlen(buf);
 685                         current_ev = iwe_stream_add_point(info, current_ev,
 686                                                           end_buf,
 687                                                           &iwe, buf);
 688                         kfree(buf);
 689                         break;
 690                 case WLAN_EID_SUPP_RATES:
 691                 case WLAN_EID_EXT_SUPP_RATES:
 692                         /* display all supported rates in readable format */
 693                         p = current_ev + iwe_stream_lcp_len(info);
 694
 695                         memset(&iwe, 0, sizeof(iwe));
 696                         iwe.cmd = SIOCGIWRATE;
 697                         /* Those two flags are ignored... */
 698                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
 699
 700                         for (i = 0; i < ie[1]; i++) {
 701                                 iwe.u.bitrate.value =
 702                                         ((ie[i + 2] & 0x7f) * 500000);
 703                                 p = iwe_stream_add_value(info, current_ev, p,
 704                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
 705                         }
 706                         current_ev = p;
 707                         break;
 708                 }
 709                 rem -= ie[1] + 2;
 710                 ie += ie[1] + 2;
 711         }
 712
 713         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
 714             || ismesh) {
 715                 memset(&iwe, 0, sizeof(iwe));
 716                 iwe.cmd = SIOCGIWMODE;
 717                 if (ismesh)
 718                         iwe.u.mode = IW_MODE_MESH;
 719                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
 720                         iwe.u.mode = IW_MODE_MASTER;
 721                 else
 722                         iwe.u.mode = IW_MODE_ADHOC;
 723                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
 724                                                   &iwe, IW_EV_UINT_LEN);
 725         }
 726
 727         buf = kmalloc(30, GFP_ATOMIC);
 728         if (buf) {
 729                 memset(&iwe, 0, sizeof(iwe));
 730                 iwe.cmd = IWEVCUSTOM;
 731                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
 732                 iwe.u.data.length = strlen(buf);
 733                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 734                                                   &iwe, buf);
 735                 memset(&iwe, 0, sizeof(iwe));
 736                 iwe.cmd = IWEVCUSTOM;
 737                 sprintf(buf, " Last beacon: %dms ago",
 738                         jiffies_to_msecs(jiffies - bss->ts));
 739                 iwe.u.data.length = strlen(buf);
 740                 current_ev = iwe_stream_add_point(info, current_ev,
 741                                                   end_buf, &iwe, buf);
 742                 kfree(buf);
 743         }
 744
 745         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
 746
 747         return current_ev;
 748 }
 749
 750
 751 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
 752                                   struct iw_request_info *info,
 753                                   char *buf, size_t len)
 754 {
 755         char *current_ev = buf;
 756         char *end_buf = buf + len;
 757         struct cfg80211_internal_bss *bss;
 758
 759         spin_lock_bh(&dev->bss_lock);
 760         cfg80211_bss_expire(dev);
 761
 762         list_for_each_entry(bss, &dev->bss_list, list) {
 763                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
 764                         spin_unlock_bh(&dev->bss_lock);
 765                         return -E2BIG;
 766                 }
 767                 current_ev = ieee80211_bss(info, bss,
 768                                                    current_ev, end_buf);
 769         }
 770         spin_unlock_bh(&dev->bss_lock);
 771         return current_ev - buf;
 772 }
 773
 774
 775 int cfg80211_wext_giwscan(struct net_device *dev,
 776                           struct iw_request_info *info,
 777                           struct iw_point *data, char *extra)
 778 {
 779         struct cfg80211_registered_device *rdev;
 780         int res;
 781
 782         if (!netif_running(dev))
 783                 return -ENETDOWN;
 784
 785         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
 786
 787         if (IS_ERR(rdev))
 788                 return PTR_ERR(rdev);
 789
 790         if (rdev->scan_req) {
 791                 res = -EAGAIN;
 792                 goto out;
 793         }
 794
 795         res = ieee80211_scan_results(rdev, info, extra, data->length);
 796         data->length = 0;
 797         if (res >= 0) {
 798                 data->length = res;
 799                 res = 0;
 800         }
 801
 802  out:
 803         cfg80211_put_dev(rdev);
 804         return res;
 805 }
 806 EXPORT_SYMBOL(cfg80211_wext_giwscan);
 807 #endif