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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 #include "wext-compat.h"
  18
  19 #define IEEE80211_SCAN_RESULT_EXPIRE    (15 * HZ)
  20
  21 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
  22 {
  23         struct cfg80211_scan_request *request;
  24         struct net_device *dev;
  25 #ifdef CONFIG_CFG80211_WEXT
  26         union iwreq_data wrqu;
  27 #endif
  28
  29         ASSERT_RDEV_LOCK(rdev);
  30
  31         request = rdev->scan_req;
  32
  33         if (!request)
  34                 return;
  35
  36         dev = request->dev;
  37
  38         /*
  39          * This must be before sending the other events!
  40          * Otherwise, wpa_supplicant gets completely confused with
  41          * wext events.
  42          */
  43         cfg80211_sme_scan_done(dev);
  44
  45         if (request->aborted)
  46                 nl80211_send_scan_aborted(rdev, dev);
  47         else
  48                 nl80211_send_scan_done(rdev, dev);
  49
  50 #ifdef CONFIG_CFG80211_WEXT
  51         if (!request->aborted) {
  52                 memset(&wrqu, 0, sizeof(wrqu));
  53
  54                 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
  55         }
  56 #endif
  57
  58         dev_put(dev);
  59
  60         rdev->scan_req = NULL;
  61
  62         /*
  63          * OK. If this is invoked with "leak" then we can't
  64          * free this ... but we've cleaned it up anyway. The
  65          * driver failed to call the scan_done callback, so
  66          * all bets are off, it might still be trying to use
  67          * the scan request or not ... if it accesses the dev
  68          * in there (it shouldn't anyway) then it may crash.
  69          */
  70         if (!leak)
  71                 kfree(request);
  72 }
  73
  74 void __cfg80211_scan_done(struct work_struct *wk)
  75 {
  76         struct cfg80211_registered_device *rdev;
  77
  78         rdev = container_of(wk, struct cfg80211_registered_device,
  79                             scan_done_wk);
  80
  81         cfg80211_lock_rdev(rdev);
  82         ___cfg80211_scan_done(rdev, false);
  83         cfg80211_unlock_rdev(rdev);
  84 }
  85
  86 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
  87 {
  88         WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
  89
  90         request->aborted = aborted;
  91         queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
  92 }
  93 EXPORT_SYMBOL(cfg80211_scan_done);
  94
  95 static void bss_release(struct kref *ref)
  96 {
  97         struct cfg80211_internal_bss *bss;
  98
  99         bss = container_of(ref, struct cfg80211_internal_bss, ref);
 100         if (bss->pub.free_priv)
 101                 bss->pub.free_priv(&bss->pub);
 102
 103         if (bss->beacon_ies_allocated)
 104                 kfree(bss->pub.beacon_ies);
 105         if (bss->proberesp_ies_allocated)
 106                 kfree(bss->pub.proberesp_ies);
 107
 108         BUG_ON(atomic_read(&bss->hold));
 109
 110         kfree(bss);
 111 }
 112
 113 /* must hold dev->bss_lock! */
 114 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
 115                       unsigned long age_secs)
 116 {
 117         struct cfg80211_internal_bss *bss;
 118         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
 119
 120         list_for_each_entry(bss, &dev->bss_list, list) {
 121                 bss->ts -= age_jiffies;
 122         }
 123 }
 124
 125 /* must hold dev->bss_lock! */
 126 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
 127 {
 128         struct cfg80211_internal_bss *bss, *tmp;
 129         bool expired = false;
 130
 131         list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
 132                 if (atomic_read(&bss->hold))
 133                         continue;
 134                 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
 135                         continue;
 136                 list_del(&bss->list);
 137                 rb_erase(&bss->rbn, &dev->bss_tree);
 138                 kref_put(&bss->ref, bss_release);
 139                 expired = true;
 140         }
 141
 142         if (expired)
 143                 dev->bss_generation++;
 144 }
 145
 146 static u8 *find_ie(u8 num, u8 *ies, int len)
 147 {
 148         while (len > 2 && ies[0] != num) {
 149                 len -= ies[1] + 2;
 150                 ies += ies[1] + 2;
 151         }
 152         if (len < 2)
 153                 return NULL;
 154         if (len < 2 + ies[1])
 155                 return NULL;
 156         return ies;
 157 }
 158
 159 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
 160 {
 161         const u8 *ie1 = find_ie(num, ies1, len1);
 162         const u8 *ie2 = find_ie(num, ies2, len2);
 163         int r;
 164
 165         if (!ie1 && !ie2)
 166                 return 0;
 167         if (!ie1 || !ie2)
 168                 return -1;
 169
 170         r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
 171         if (r == 0 && ie1[1] != ie2[1])
 172                 return ie2[1] - ie1[1];
 173         return r;
 174 }
 175
 176 static bool is_bss(struct cfg80211_bss *a,
 177                    const u8 *bssid,
 178                    const u8 *ssid, size_t ssid_len)
 179 {
 180         const u8 *ssidie;
 181
 182         if (bssid && compare_ether_addr(a->bssid, bssid))
 183                 return false;
 184
 185         if (!ssid)
 186                 return true;
 187
 188         ssidie = find_ie(WLAN_EID_SSID,
 189                          a->information_elements,
 190                          a->len_information_elements);
 191         if (!ssidie)
 192                 return false;
 193         if (ssidie[1] != ssid_len)
 194                 return false;
 195         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
 196 }
 197
 198 static bool is_mesh(struct cfg80211_bss *a,
 199                     const u8 *meshid, size_t meshidlen,
 200                     const u8 *meshcfg)
 201 {
 202         const u8 *ie;
 203
 204         if (!is_zero_ether_addr(a->bssid))
 205                 return false;
 206
 207         ie = find_ie(WLAN_EID_MESH_ID,
 208                      a->information_elements,
 209                      a->len_information_elements);
 210         if (!ie)
 211                 return false;
 212         if (ie[1] != meshidlen)
 213                 return false;
 214         if (memcmp(ie + 2, meshid, meshidlen))
 215                 return false;
 216
 217         ie = find_ie(WLAN_EID_MESH_CONFIG,
 218                      a->information_elements,
 219                      a->len_information_elements);
 220         if (!ie)
 221                 return false;
 222         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
 223                 return false;
 224
 225         /*
 226          * Ignore mesh capability (last two bytes of the IE) when
 227          * comparing since that may differ between stations taking
 228          * part in the same mesh.
 229          */
 230         return memcmp(ie + 2, meshcfg,
 231             sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
 232 }
 233
 234 static int cmp_bss(struct cfg80211_bss *a,
 235                    struct cfg80211_bss *b)
 236 {
 237         int r;
 238
 239         if (a->channel != b->channel)
 240                 return b->channel->center_freq - a->channel->center_freq;
 241
 242         r = memcmp(a->bssid, b->bssid, ETH_ALEN);
 243         if (r)
 244                 return r;
 245
 246         if (is_zero_ether_addr(a->bssid)) {
 247                 r = cmp_ies(WLAN_EID_MESH_ID,
 248                             a->information_elements,
 249                             a->len_information_elements,
 250                             b->information_elements,
 251                             b->len_information_elements);
 252                 if (r)
 253                         return r;
 254                 return cmp_ies(WLAN_EID_MESH_CONFIG,
 255                                a->information_elements,
 256                                a->len_information_elements,
 257                                b->information_elements,
 258                                b->len_information_elements);
 259         }
 260
 261         return cmp_ies(WLAN_EID_SSID,
 262                        a->information_elements,
 263                        a->len_information_elements,
 264                        b->information_elements,
 265                        b->len_information_elements);
 266 }
 267
 268 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
 269                                       struct ieee80211_channel *channel,
 270                                       const u8 *bssid,
 271                                       const u8 *ssid, size_t ssid_len,
 272                                       u16 capa_mask, u16 capa_val)
 273 {
 274         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 275         struct cfg80211_internal_bss *bss, *res = NULL;
 276
 277         spin_lock_bh(&dev->bss_lock);
 278
 279         list_for_each_entry(bss, &dev->bss_list, list) {
 280                 if ((bss->pub.capability & capa_mask) != capa_val)
 281                         continue;
 282                 if (channel && bss->pub.channel != channel)
 283                         continue;
 284                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
 285                         res = bss;
 286                         kref_get(&res->ref);
 287                         break;
 288                 }
 289         }
 290
 291         spin_unlock_bh(&dev->bss_lock);
 292         if (!res)
 293                 return NULL;
 294         return &res->pub;
 295 }
 296 EXPORT_SYMBOL(cfg80211_get_bss);
 297
 298 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
 299                                        struct ieee80211_channel *channel,
 300                                        const u8 *meshid, size_t meshidlen,
 301                                        const u8 *meshcfg)
 302 {
 303         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 304         struct cfg80211_internal_bss *bss, *res = NULL;
 305
 306         spin_lock_bh(&dev->bss_lock);
 307
 308         list_for_each_entry(bss, &dev->bss_list, list) {
 309                 if (channel && bss->pub.channel != channel)
 310                         continue;
 311                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
 312                         res = bss;
 313                         kref_get(&res->ref);
 314                         break;
 315                 }
 316         }
 317
 318         spin_unlock_bh(&dev->bss_lock);
 319         if (!res)
 320                 return NULL;
 321         return &res->pub;
 322 }
 323 EXPORT_SYMBOL(cfg80211_get_mesh);
 324
 325
 326 static void rb_insert_bss(struct cfg80211_registered_device *dev,
 327                           struct cfg80211_internal_bss *bss)
 328 {
 329         struct rb_node **p = &dev->bss_tree.rb_node;
 330         struct rb_node *parent = NULL;
 331         struct cfg80211_internal_bss *tbss;
 332         int cmp;
 333
 334         while (*p) {
 335                 parent = *p;
 336                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
 337
 338                 cmp = cmp_bss(&bss->pub, &tbss->pub);
 339
 340                 if (WARN_ON(!cmp)) {
 341                         /* will sort of leak this BSS */
 342                         return;
 343                 }
 344
 345                 if (cmp < 0)
 346                         p = &(*p)->rb_left;
 347                 else
 348                         p = &(*p)->rb_right;
 349         }
 350
 351         rb_link_node(&bss->rbn, parent, p);
 352         rb_insert_color(&bss->rbn, &dev->bss_tree);
 353 }
 354
 355 static struct cfg80211_internal_bss *
 356 rb_find_bss(struct cfg80211_registered_device *dev,
 357             struct cfg80211_internal_bss *res)
 358 {
 359         struct rb_node *n = dev->bss_tree.rb_node;
 360         struct cfg80211_internal_bss *bss;
 361         int r;
 362
 363         while (n) {
 364                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
 365                 r = cmp_bss(&res->pub, &bss->pub);
 366
 367                 if (r == 0)
 368                         return bss;
 369                 else if (r < 0)
 370                         n = n->rb_left;
 371                 else
 372                         n = n->rb_right;
 373         }
 374
 375         return NULL;
 376 }
 377
 378 static struct cfg80211_internal_bss *
 379 cfg80211_bss_update(struct cfg80211_registered_device *dev,
 380                     struct cfg80211_internal_bss *res)
 381 {
 382         struct cfg80211_internal_bss *found = NULL;
 383         const u8 *meshid, *meshcfg;
 384
 385         /*
 386          * The reference to "res" is donated to this function.
 387          */
 388
 389         if (WARN_ON(!res->pub.channel)) {
 390                 kref_put(&res->ref, bss_release);
 391                 return NULL;
 392         }
 393
 394         res->ts = jiffies;
 395
 396         if (is_zero_ether_addr(res->pub.bssid)) {
 397                 /* must be mesh, verify */
 398                 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
 399                                  res->pub.len_information_elements);
 400                 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
 401                                   res->pub.information_elements,
 402                                   res->pub.len_information_elements);
 403                 if (!meshid || !meshcfg ||
 404                     meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) {
 405                         /* bogus mesh */
 406                         kref_put(&res->ref, bss_release);
 407                         return NULL;
 408                 }
 409         }
 410
 411         spin_lock_bh(&dev->bss_lock);
 412
 413         found = rb_find_bss(dev, res);
 414
 415         if (found) {
 416                 found->pub.beacon_interval = res->pub.beacon_interval;
 417                 found->pub.tsf = res->pub.tsf;
 418                 found->pub.signal = res->pub.signal;
 419                 found->pub.capability = res->pub.capability;
 420                 found->ts = res->ts;
 421
 422                 /* Update IEs */
 423                 if (res->pub.proberesp_ies) {
 424                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
 425                         size_t ielen = res->pub.len_proberesp_ies;
 426
 427                         if (found->pub.proberesp_ies &&
 428                             !found->proberesp_ies_allocated &&
 429                             ksize(found) >= used + ielen) {
 430                                 memcpy(found->pub.proberesp_ies,
 431                                        res->pub.proberesp_ies, ielen);
 432                                 found->pub.len_proberesp_ies = ielen;
 433                         } else {
 434                                 u8 *ies = found->pub.proberesp_ies;
 435
 436                                 if (found->proberesp_ies_allocated)
 437                                         ies = krealloc(ies, ielen, GFP_ATOMIC);
 438                                 else
 439                                         ies = kmalloc(ielen, GFP_ATOMIC);
 440
 441                                 if (ies) {
 442                                         memcpy(ies, res->pub.proberesp_ies,
 443                                                ielen);
 444                                         found->proberesp_ies_allocated = true;
 445                                         found->pub.proberesp_ies = ies;
 446                                         found->pub.len_proberesp_ies = ielen;
 447                                 }
 448                         }
 449
 450                         /* Override possible earlier Beacon frame IEs */
 451                         found->pub.information_elements =
 452                                 found->pub.proberesp_ies;
 453                         found->pub.len_information_elements =
 454                                 found->pub.len_proberesp_ies;
 455                 }
 456                 if (res->pub.beacon_ies) {
 457                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
 458                         size_t ielen = res->pub.len_beacon_ies;
 459
 460                         if (found->pub.beacon_ies &&
 461                             !found->beacon_ies_allocated &&
 462                             ksize(found) >= used + ielen) {
 463                                 memcpy(found->pub.beacon_ies,
 464                                        res->pub.beacon_ies, ielen);
 465                                 found->pub.len_beacon_ies = ielen;
 466                         } else {
 467                                 u8 *ies = found->pub.beacon_ies;
 468
 469                                 if (found->beacon_ies_allocated)
 470                                         ies = krealloc(ies, ielen, GFP_ATOMIC);
 471                                 else
 472                                         ies = kmalloc(ielen, GFP_ATOMIC);
 473
 474                                 if (ies) {
 475                                         memcpy(ies, res->pub.beacon_ies,
 476                                                ielen);
 477                                         found->beacon_ies_allocated = true;
 478                                         found->pub.beacon_ies = ies;
 479                                         found->pub.len_beacon_ies = ielen;
 480                                 }
 481                         }
 482                 }
 483
 484                 kref_put(&res->ref, bss_release);
 485         } else {
 486                 /* this "consumes" the reference */
 487                 list_add_tail(&res->list, &dev->bss_list);
 488                 rb_insert_bss(dev, res);
 489                 found = res;
 490         }
 491
 492         dev->bss_generation++;
 493         spin_unlock_bh(&dev->bss_lock);
 494
 495         kref_get(&found->ref);
 496         return found;
 497 }
 498
 499 struct cfg80211_bss*
 500 cfg80211_inform_bss(struct wiphy *wiphy,
 501                     struct ieee80211_channel *channel,
 502                     const u8 *bssid,
 503                     u64 timestamp, u16 capability, u16 beacon_interval,
 504                     const u8 *ie, size_t ielen,
 505                     s32 signal, gfp_t gfp)
 506 {
 507         struct cfg80211_internal_bss *res;
 508         size_t privsz;
 509
 510         if (WARN_ON(!wiphy))
 511                 return NULL;
 512
 513         privsz = wiphy->bss_priv_size;
 514
 515         if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
 516                         (signal < 0 || signal > 100)))
 517                 return NULL;
 518
 519         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
 520         if (!res)
 521                 return NULL;
 522
 523         memcpy(res->pub.bssid, bssid, ETH_ALEN);
 524         res->pub.channel = channel;
 525         res->pub.signal = signal;
 526         res->pub.tsf = timestamp;
 527         res->pub.beacon_interval = beacon_interval;
 528         res->pub.capability = capability;
 529         /*
 530          * Since we do not know here whether the IEs are from a Beacon or Probe
 531          * Response frame, we need to pick one of the options and only use it
 532          * with the driver that does not provide the full Beacon/Probe Response
 533          * frame. Use Beacon frame pointer to avoid indicating that this should
 534          * override the information_elements pointer should we have received an
 535          * earlier indication of Probe Response data.
 536          *
 537          * The initial buffer for the IEs is allocated with the BSS entry and
 538          * is located after the private area.
 539          */
 540         res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
 541         memcpy(res->pub.beacon_ies, ie, ielen);
 542         res->pub.len_beacon_ies = ielen;
 543         res->pub.information_elements = res->pub.beacon_ies;
 544         res->pub.len_information_elements = res->pub.len_beacon_ies;
 545
 546         kref_init(&res->ref);
 547
 548         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
 549         if (!res)
 550                 return NULL;
 551
 552         if (res->pub.capability & WLAN_CAPABILITY_ESS)
 553                 regulatory_hint_found_beacon(wiphy, channel, gfp);
 554
 555         /* cfg80211_bss_update gives us a referenced result */
 556         return &res->pub;
 557 }
 558 EXPORT_SYMBOL(cfg80211_inform_bss);
 559
 560 struct cfg80211_bss *
 561 cfg80211_inform_bss_frame(struct wiphy *wiphy,
 562                           struct ieee80211_channel *channel,
 563                           struct ieee80211_mgmt *mgmt, size_t len,
 564                           s32 signal, gfp_t gfp)
 565 {
 566         struct cfg80211_internal_bss *res;
 567         size_t ielen = len - offsetof(struct ieee80211_mgmt,
 568                                       u.probe_resp.variable);
 569         size_t privsz = wiphy->bss_priv_size;
 570
 571         if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
 572                     (signal < 0 || signal > 100)))
 573                 return NULL;
 574
 575         if (WARN_ON(!mgmt || !wiphy ||
 576                     len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
 577                 return NULL;
 578
 579         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
 580         if (!res)
 581                 return NULL;
 582
 583         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
 584         res->pub.channel = channel;
 585         res->pub.signal = signal;
 586         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
 587         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
 588         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
 589         /*
 590          * The initial buffer for the IEs is allocated with the BSS entry and
 591          * is located after the private area.
 592          */
 593         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
 594                 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
 595                 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
 596                        ielen);
 597                 res->pub.len_proberesp_ies = ielen;
 598                 res->pub.information_elements = res->pub.proberesp_ies;
 599                 res->pub.len_information_elements = res->pub.len_proberesp_ies;
 600         } else {
 601                 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
 602                 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
 603                 res->pub.len_beacon_ies = ielen;
 604                 res->pub.information_elements = res->pub.beacon_ies;
 605                 res->pub.len_information_elements = res->pub.len_beacon_ies;
 606         }
 607
 608         kref_init(&res->ref);
 609
 610         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
 611         if (!res)
 612                 return NULL;
 613
 614         if (res->pub.capability & WLAN_CAPABILITY_ESS)
 615                 regulatory_hint_found_beacon(wiphy, channel, gfp);
 616
 617         /* cfg80211_bss_update gives us a referenced result */
 618         return &res->pub;
 619 }
 620 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
 621
 622 void cfg80211_put_bss(struct cfg80211_bss *pub)
 623 {
 624         struct cfg80211_internal_bss *bss;
 625
 626         if (!pub)
 627                 return;
 628
 629         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 630         kref_put(&bss->ref, bss_release);
 631 }
 632 EXPORT_SYMBOL(cfg80211_put_bss);
 633
 634 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 635 {
 636         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
 637         struct cfg80211_internal_bss *bss;
 638
 639         if (WARN_ON(!pub))
 640                 return;
 641
 642         bss = container_of(pub, struct cfg80211_internal_bss, pub);
 643
 644         spin_lock_bh(&dev->bss_lock);
 645
 646         list_del(&bss->list);
 647         dev->bss_generation++;
 648         rb_erase(&bss->rbn, &dev->bss_tree);
 649
 650         spin_unlock_bh(&dev->bss_lock);
 651
 652         kref_put(&bss->ref, bss_release);
 653 }
 654 EXPORT_SYMBOL(cfg80211_unlink_bss);
 655
 656 #ifdef CONFIG_CFG80211_WEXT
 657 int cfg80211_wext_siwscan(struct net_device *dev,
 658                           struct iw_request_info *info,
 659                           union iwreq_data *wrqu, char *extra)
 660 {
 661         struct cfg80211_registered_device *rdev;
 662         struct wiphy *wiphy;
 663         struct iw_scan_req *wreq = NULL;
 664         struct cfg80211_scan_request *creq = NULL;
 665         int i, err, n_channels = 0;
 666         enum ieee80211_band band;
 667
 668         if (!netif_running(dev))
 669                 return -ENETDOWN;
 670
 671         if (wrqu->data.length == sizeof(struct iw_scan_req))
 672                 wreq = (struct iw_scan_req *)extra;
 673
 674         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
 675
 676         if (IS_ERR(rdev))
 677                 return PTR_ERR(rdev);
 678
 679         if (rdev->scan_req) {
 680                 err = -EBUSY;
 681                 goto out;
 682         }
 683
 684         wiphy = &rdev->wiphy;
 685
 686         /* Determine number of channels, needed to allocate creq */
 687         if (wreq && wreq->num_channels)
 688                 n_channels = wreq->num_channels;
 689         else {
 690                 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 691                         if (wiphy->bands[band])
 692                                 n_channels += wiphy->bands[band]->n_channels;
 693         }
 694
 695         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
 696                        n_channels * sizeof(void *),
 697                        GFP_ATOMIC);
 698         if (!creq) {
 699                 err = -ENOMEM;
 700                 goto out;
 701         }
 702
 703         creq->wiphy = wiphy;
 704         creq->dev = dev;
 705         /* SSIDs come after channels */
 706         creq->ssids = (void *)&creq->channels[n_channels];
 707         creq->n_channels = n_channels;
 708         creq->n_ssids = 1;
 709
 710         /* translate "Scan on frequencies" request */
 711         i = 0;
 712         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 713                 int j;
 714
 715                 if (!wiphy->bands[band])
 716                         continue;
 717
 718                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
 719                         /* ignore disabled channels */
 720                         if (wiphy->bands[band]->channels[j].flags &
 721                                                 IEEE80211_CHAN_DISABLED)
 722                                 continue;
 723
 724                         /* If we have a wireless request structure and the
 725                          * wireless request specifies frequencies, then search
 726                          * for the matching hardware channel.
 727                          */
 728                         if (wreq && wreq->num_channels) {
 729                                 int k;
 730                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
 731                                 for (k = 0; k < wreq->num_channels; k++) {
 732                                         int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
 733                                         if (wext_freq == wiphy_freq)
 734                                                 goto wext_freq_found;
 735                                 }
 736                                 goto wext_freq_not_found;
 737                         }
 738
 739                 wext_freq_found:
 740                         creq->channels[i] = &wiphy->bands[band]->channels[j];
 741                         i++;
 742                 wext_freq_not_found: ;
 743                 }
 744         }
 745         /* No channels found? */
 746         if (!i) {
 747                 err = -EINVAL;
 748                 goto out;
 749         }
 750
 751         /* Set real number of channels specified in creq->channels[] */
 752         creq->n_channels = i;
 753
 754         /* translate "Scan for SSID" request */
 755         if (wreq) {
 756                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
 757                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
 758                                 err = -EINVAL;
 759                                 goto out;
 760                         }
 761                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
 762                         creq->ssids[0].ssid_len = wreq->essid_len;
 763                 }
 764                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
 765                         creq->n_ssids = 0;
 766         }
 767
 768         rdev->scan_req = creq;
 769         err = rdev->ops->scan(wiphy, dev, creq);
 770         if (err) {
 771                 rdev->scan_req = NULL;
 772                 /* creq will be freed below */
 773         } else {
 774                 nl80211_send_scan_start(rdev, dev);
 775                 /* creq now owned by driver */
 776                 creq = NULL;
 777                 dev_hold(dev);
 778         }
 779  out:
 780         kfree(creq);
 781         cfg80211_unlock_rdev(rdev);
 782         return err;
 783 }
 784 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
 785
 786 static void ieee80211_scan_add_ies(struct iw_request_info *info,
 787                                    struct cfg80211_bss *bss,
 788                                    char **current_ev, char *end_buf)
 789 {
 790         u8 *pos, *end, *next;
 791         struct iw_event iwe;
 792
 793         if (!bss->information_elements ||
 794             !bss->len_information_elements)
 795                 return;
 796
 797         /*
 798          * If needed, fragment the IEs buffer (at IE boundaries) into short
 799          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
 800          */
 801         pos = bss->information_elements;
 802         end = pos + bss->len_information_elements;
 803
 804         while (end - pos > IW_GENERIC_IE_MAX) {
 805                 next = pos + 2 + pos[1];
 806                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
 807                         next = next + 2 + next[1];
 808
 809                 memset(&iwe, 0, sizeof(iwe));
 810                 iwe.cmd = IWEVGENIE;
 811                 iwe.u.data.length = next - pos;
 812                 *current_ev = iwe_stream_add_point(info, *current_ev,
 813                                                    end_buf, &iwe, pos);
 814
 815                 pos = next;
 816         }
 817
 818         if (end > pos) {
 819                 memset(&iwe, 0, sizeof(iwe));
 820                 iwe.cmd = IWEVGENIE;
 821                 iwe.u.data.length = end - pos;
 822                 *current_ev = iwe_stream_add_point(info, *current_ev,
 823                                                    end_buf, &iwe, pos);
 824         }
 825 }
 826
 827 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
 828 {
 829         unsigned long end = jiffies;
 830
 831         if (end >= start)
 832                 return jiffies_to_msecs(end - start);
 833
 834         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
 835 }
 836
 837 static char *
 838 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
 839               struct cfg80211_internal_bss *bss, char *current_ev,
 840               char *end_buf)
 841 {
 842         struct iw_event iwe;
 843         u8 *buf, *cfg, *p;
 844         u8 *ie = bss->pub.information_elements;
 845         int rem = bss->pub.len_information_elements, i, sig;
 846         bool ismesh = false;
 847
 848         memset(&iwe, 0, sizeof(iwe));
 849         iwe.cmd = SIOCGIWAP;
 850         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
 851         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
 852         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 853                                           IW_EV_ADDR_LEN);
 854
 855         memset(&iwe, 0, sizeof(iwe));
 856         iwe.cmd = SIOCGIWFREQ;
 857         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
 858         iwe.u.freq.e = 0;
 859         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 860                                           IW_EV_FREQ_LEN);
 861
 862         memset(&iwe, 0, sizeof(iwe));
 863         iwe.cmd = SIOCGIWFREQ;
 864         iwe.u.freq.m = bss->pub.channel->center_freq;
 865         iwe.u.freq.e = 6;
 866         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
 867                                           IW_EV_FREQ_LEN);
 868
 869         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
 870                 memset(&iwe, 0, sizeof(iwe));
 871                 iwe.cmd = IWEVQUAL;
 872                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
 873                                      IW_QUAL_NOISE_INVALID |
 874                                      IW_QUAL_QUAL_UPDATED;
 875                 switch (wiphy->signal_type) {
 876                 case CFG80211_SIGNAL_TYPE_MBM:
 877                         sig = bss->pub.signal / 100;
 878                         iwe.u.qual.level = sig;
 879                         iwe.u.qual.updated |= IW_QUAL_DBM;
 880                         if (sig < -110)         /* rather bad */
 881                                 sig = -110;
 882                         else if (sig > -40)     /* perfect */
 883                                 sig = -40;
 884                         /* will give a range of 0 .. 70 */
 885                         iwe.u.qual.qual = sig + 110;
 886                         break;
 887                 case CFG80211_SIGNAL_TYPE_UNSPEC:
 888                         iwe.u.qual.level = bss->pub.signal;
 889                         /* will give range 0 .. 100 */
 890                         iwe.u.qual.qual = bss->pub.signal;
 891                         break;
 892                 default:
 893                         /* not reached */
 894                         break;
 895                 }
 896                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
 897                                                   &iwe, IW_EV_QUAL_LEN);
 898         }
 899
 900         memset(&iwe, 0, sizeof(iwe));
 901         iwe.cmd = SIOCGIWENCODE;
 902         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
 903                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
 904         else
 905                 iwe.u.data.flags = IW_ENCODE_DISABLED;
 906         iwe.u.data.length = 0;
 907         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 908                                           &iwe, "");
 909
 910         while (rem >= 2) {
 911                 /* invalid data */
 912                 if (ie[1] > rem - 2)
 913                         break;
 914
 915                 switch (ie[0]) {
 916                 case WLAN_EID_SSID:
 917                         memset(&iwe, 0, sizeof(iwe));
 918                         iwe.cmd = SIOCGIWESSID;
 919                         iwe.u.data.length = ie[1];
 920                         iwe.u.data.flags = 1;
 921                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 922                                                           &iwe, ie + 2);
 923                         break;
 924                 case WLAN_EID_MESH_ID:
 925                         memset(&iwe, 0, sizeof(iwe));
 926                         iwe.cmd = SIOCGIWESSID;
 927                         iwe.u.data.length = ie[1];
 928                         iwe.u.data.flags = 1;
 929                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
 930                                                           &iwe, ie + 2);
 931                         break;
 932                 case WLAN_EID_MESH_CONFIG:
 933                         ismesh = true;
 934                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
 935                                 break;
 936                         buf = kmalloc(50, GFP_ATOMIC);
 937                         if (!buf)
 938                                 break;
 939                         cfg = ie + 2;
 940                         memset(&iwe, 0, sizeof(iwe));
 941                         iwe.cmd = IWEVCUSTOM;
 942                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
 943                                 "0x%02X", cfg[0]);
 944                         iwe.u.data.length = strlen(buf);
 945                         current_ev = iwe_stream_add_point(info, current_ev,
 946                                                           end_buf,
 947                                                           &iwe, buf);
 948                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
 949                                 cfg[1]);
 950                         iwe.u.data.length = strlen(buf);
 951                         current_ev = iwe_stream_add_point(info, current_ev,
 952                                                           end_buf,
 953                                                           &iwe, buf);
 954                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
 955                                 cfg[2]);
 956                         iwe.u.data.length = strlen(buf);
 957                         current_ev = iwe_stream_add_point(info, current_ev,
 958                                                           end_buf,
 959                                                           &iwe, buf);
 960                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
 961                         iwe.u.data.length = strlen(buf);
 962                         current_ev = iwe_stream_add_point(info, current_ev,
 963                                                           end_buf,
 964                                                           &iwe, buf);
 965                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
 966                         iwe.u.data.length = strlen(buf);
 967                         current_ev = iwe_stream_add_point(info, current_ev,
 968                                                           end_buf,
 969                                                           &iwe, buf);
 970                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
 971                         iwe.u.data.length = strlen(buf);
 972                         current_ev = iwe_stream_add_point(info, current_ev,
 973                                                           end_buf,
 974                                                           &iwe, buf);
 975                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
 976                         iwe.u.data.length = strlen(buf);
 977                         current_ev = iwe_stream_add_point(info, current_ev,
 978                                                           end_buf,
 979                                                           &iwe, buf);
 980                         kfree(buf);
 981                         break;
 982                 case WLAN_EID_SUPP_RATES:
 983                 case WLAN_EID_EXT_SUPP_RATES:
 984                         /* display all supported rates in readable format */
 985                         p = current_ev + iwe_stream_lcp_len(info);
 986
 987                         memset(&iwe, 0, sizeof(iwe));
 988                         iwe.cmd = SIOCGIWRATE;
 989                         /* Those two flags are ignored... */
 990                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
 991
 992                         for (i = 0; i < ie[1]; i++) {
 993                                 iwe.u.bitrate.value =
 994                                         ((ie[i + 2] & 0x7f) * 500000);
 995                                 p = iwe_stream_add_value(info, current_ev, p,
 996                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
 997                         }
 998                         current_ev = p;
 999                         break;
1000                 }
1001                 rem -= ie[1] + 2;
1002                 ie += ie[1] + 2;
1003         }
1004
1005         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1006             ismesh) {
1007                 memset(&iwe, 0, sizeof(iwe));
1008                 iwe.cmd = SIOCGIWMODE;
1009                 if (ismesh)
1010                         iwe.u.mode = IW_MODE_MESH;
1011                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1012                         iwe.u.mode = IW_MODE_MASTER;
1013                 else
1014                         iwe.u.mode = IW_MODE_ADHOC;
1015                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1016                                                   &iwe, IW_EV_UINT_LEN);
1017         }
1018
1019         buf = kmalloc(30, GFP_ATOMIC);
1020         if (buf) {
1021                 memset(&iwe, 0, sizeof(iwe));
1022                 iwe.cmd = IWEVCUSTOM;
1023                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1024                 iwe.u.data.length = strlen(buf);
1025                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1026                                                   &iwe, buf);
1027                 memset(&iwe, 0, sizeof(iwe));
1028                 iwe.cmd = IWEVCUSTOM;
1029                 sprintf(buf, " Last beacon: %ums ago",
1030                         elapsed_jiffies_msecs(bss->ts));
1031                 iwe.u.data.length = strlen(buf);
1032                 current_ev = iwe_stream_add_point(info, current_ev,
1033                                                   end_buf, &iwe, buf);
1034                 kfree(buf);
1035         }
1036
1037         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1038
1039         return current_ev;
1040 }
1041
1042
1043 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1044                                   struct iw_request_info *info,
1045                                   char *buf, size_t len)
1046 {
1047         char *current_ev = buf;
1048         char *end_buf = buf + len;
1049         struct cfg80211_internal_bss *bss;
1050
1051         spin_lock_bh(&dev->bss_lock);
1052         cfg80211_bss_expire(dev);
1053
1054         list_for_each_entry(bss, &dev->bss_list, list) {
1055                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1056                         spin_unlock_bh(&dev->bss_lock);
1057                         return -E2BIG;
1058                 }
1059                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1060                                            current_ev, end_buf);
1061         }
1062         spin_unlock_bh(&dev->bss_lock);
1063         return current_ev - buf;
1064 }
1065
1066
1067 int cfg80211_wext_giwscan(struct net_device *dev,
1068                           struct iw_request_info *info,
1069                           struct iw_point *data, char *extra)
1070 {
1071         struct cfg80211_registered_device *rdev;
1072         int res;
1073
1074         if (!netif_running(dev))
1075                 return -ENETDOWN;
1076
1077         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1078
1079         if (IS_ERR(rdev))
1080                 return PTR_ERR(rdev);
1081
1082         if (rdev->scan_req) {
1083                 res = -EAGAIN;
1084                 goto out;
1085         }
1086
1087         res = ieee80211_scan_results(rdev, info, extra, data->length);
1088         data->length = 0;
1089         if (res >= 0) {
1090                 data->length = res;
1091                 res = 0;
1092         }
1093
1094  out:
1095         cfg80211_unlock_rdev(rdev);
1096         return res;
1097 }
1098 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1099 #endif