SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/scan.c

   1 /*
   2  * Scanning implementation
   3  *
   4  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
   5  * Copyright 2004, Instant802 Networks, Inc.
   6  * Copyright 2005, Devicescape Software, Inc.
   7  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 /* TODO:
  16  * figure out how to avoid that the "current BSS" expires
  17  * clean up IBSS code (in MLME), see why it adds a BSS to the list
  18  * use cfg80211's BSS handling (depends on IBSS TODO above)
  19  * order BSS list by RSSI(?) ("quality of AP")
  20  * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
  21  *    SSID)
  22  */
  23
  24 #include <linux/wireless.h>
  25 #include <linux/if_arp.h>
  26 #include <linux/rtnetlink.h>
  27 #include <net/mac80211.h>
  28 #include <net/iw_handler.h>
  29
  30 #include "ieee80211_i.h"
  31 #include "mesh.h"
  32
  33 #define IEEE80211_PROBE_DELAY (HZ / 33)
  34 #define IEEE80211_CHANNEL_TIME (HZ / 33)
  35 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
  36
  37 void ieee80211_rx_bss_list_init(struct ieee80211_local *local)
  38 {
  39         spin_lock_init(&local->bss_lock);
  40         INIT_LIST_HEAD(&local->bss_list);
  41 }
  42
  43 void ieee80211_rx_bss_list_deinit(struct ieee80211_local *local)
  44 {
  45         struct ieee80211_bss *bss, *tmp;
  46
  47         list_for_each_entry_safe(bss, tmp, &local->bss_list, list)
  48                 ieee80211_rx_bss_put(local, bss);
  49 }
  50
  51 struct ieee80211_bss *
  52 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
  53                      u8 *ssid, u8 ssid_len)
  54 {
  55         struct ieee80211_bss *bss;
  56
  57         spin_lock_bh(&local->bss_lock);
  58         bss = local->bss_hash[STA_HASH(bssid)];
  59         while (bss) {
  60                 if (!bss_mesh_cfg(bss) &&
  61                     !memcmp(bss->bssid, bssid, ETH_ALEN) &&
  62                     bss->freq == freq &&
  63                     bss->ssid_len == ssid_len &&
  64                     (ssid_len == 0 || !memcmp(bss->ssid, ssid, ssid_len))) {
  65                         atomic_inc(&bss->users);
  66                         break;
  67                 }
  68                 bss = bss->hnext;
  69         }
  70         spin_unlock_bh(&local->bss_lock);
  71         return bss;
  72 }
  73
  74 /* Caller must hold local->bss_lock */
  75 static void __ieee80211_rx_bss_hash_add(struct ieee80211_local *local,
  76                                         struct ieee80211_bss *bss)
  77 {
  78         u8 hash_idx;
  79
  80         if (bss_mesh_cfg(bss))
  81                 hash_idx = mesh_id_hash(bss_mesh_id(bss),
  82                                         bss_mesh_id_len(bss));
  83         else
  84                 hash_idx = STA_HASH(bss->bssid);
  85
  86         bss->hnext = local->bss_hash[hash_idx];
  87         local->bss_hash[hash_idx] = bss;
  88 }
  89
  90 /* Caller must hold local->bss_lock */
  91 static void __ieee80211_rx_bss_hash_del(struct ieee80211_local *local,
  92                                         struct ieee80211_bss *bss)
  93 {
  94         struct ieee80211_bss *b, *prev = NULL;
  95         b = local->bss_hash[STA_HASH(bss->bssid)];
  96         while (b) {
  97                 if (b == bss) {
  98                         if (!prev)
  99                                 local->bss_hash[STA_HASH(bss->bssid)] =
 100                                         bss->hnext;
 101                         else
 102                                 prev->hnext = bss->hnext;
 103                         break;
 104                 }
 105                 prev = b;
 106                 b = b->hnext;
 107         }
 108 }
 109
 110 struct ieee80211_bss *
 111 ieee80211_rx_bss_add(struct ieee80211_local *local, u8 *bssid, int freq,
 112                      u8 *ssid, u8 ssid_len)
 113 {
 114         struct ieee80211_bss *bss;
 115
 116         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
 117         if (!bss)
 118                 return NULL;
 119         atomic_set(&bss->users, 2);
 120         memcpy(bss->bssid, bssid, ETH_ALEN);
 121         bss->freq = freq;
 122         if (ssid && ssid_len <= IEEE80211_MAX_SSID_LEN) {
 123                 memcpy(bss->ssid, ssid, ssid_len);
 124                 bss->ssid_len = ssid_len;
 125         }
 126
 127         spin_lock_bh(&local->bss_lock);
 128         /* TODO: order by RSSI? */
 129         list_add_tail(&bss->list, &local->bss_list);
 130         __ieee80211_rx_bss_hash_add(local, bss);
 131         spin_unlock_bh(&local->bss_lock);
 132         return bss;
 133 }
 134
 135 #ifdef CONFIG_MAC80211_MESH
 136 static struct ieee80211_bss *
 137 ieee80211_rx_mesh_bss_get(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
 138                           u8 *mesh_cfg, int freq)
 139 {
 140         struct ieee80211_bss *bss;
 141
 142         spin_lock_bh(&local->bss_lock);
 143         bss = local->bss_hash[mesh_id_hash(mesh_id, mesh_id_len)];
 144         while (bss) {
 145                 if (bss_mesh_cfg(bss) &&
 146                     !memcmp(bss_mesh_cfg(bss), mesh_cfg, MESH_CFG_CMP_LEN) &&
 147                     bss->freq == freq &&
 148                     mesh_id_len == bss->mesh_id_len &&
 149                     (mesh_id_len == 0 || !memcmp(bss->mesh_id, mesh_id,
 150                                                  mesh_id_len))) {
 151                         atomic_inc(&bss->users);
 152                         break;
 153                 }
 154                 bss = bss->hnext;
 155         }
 156         spin_unlock_bh(&local->bss_lock);
 157         return bss;
 158 }
 159
 160 static struct ieee80211_bss *
 161 ieee80211_rx_mesh_bss_add(struct ieee80211_local *local, u8 *mesh_id, int mesh_id_len,
 162                           u8 *mesh_cfg, int mesh_config_len, int freq)
 163 {
 164         struct ieee80211_bss *bss;
 165
 166         if (mesh_config_len != IEEE80211_MESH_CONFIG_LEN)
 167                 return NULL;
 168
 169         bss = kzalloc(sizeof(*bss), GFP_ATOMIC);
 170         if (!bss)
 171                 return NULL;
 172
 173         bss->mesh_cfg = kmalloc(MESH_CFG_CMP_LEN, GFP_ATOMIC);
 174         if (!bss->mesh_cfg) {
 175                 kfree(bss);
 176                 return NULL;
 177         }
 178
 179         if (mesh_id_len && mesh_id_len <= IEEE80211_MAX_MESH_ID_LEN) {
 180                 bss->mesh_id = kmalloc(mesh_id_len, GFP_ATOMIC);
 181                 if (!bss->mesh_id) {
 182                         kfree(bss->mesh_cfg);
 183                         kfree(bss);
 184                         return NULL;
 185                 }
 186                 memcpy(bss->mesh_id, mesh_id, mesh_id_len);
 187         }
 188
 189         atomic_set(&bss->users, 2);
 190         memcpy(bss->mesh_cfg, mesh_cfg, MESH_CFG_CMP_LEN);
 191         bss->mesh_id_len = mesh_id_len;
 192         bss->freq = freq;
 193         spin_lock_bh(&local->bss_lock);
 194         /* TODO: order by RSSI? */
 195         list_add_tail(&bss->list, &local->bss_list);
 196         __ieee80211_rx_bss_hash_add(local, bss);
 197         spin_unlock_bh(&local->bss_lock);
 198         return bss;
 199 }
 200 #endif
 201
 202 static void ieee80211_rx_bss_free(struct ieee80211_bss *bss)
 203 {
 204         kfree(bss->ies);
 205         kfree(bss_mesh_id(bss));
 206         kfree(bss_mesh_cfg(bss));
 207         kfree(bss);
 208 }
 209
 210 void ieee80211_rx_bss_put(struct ieee80211_local *local,
 211                           struct ieee80211_bss *bss)
 212 {
 213         local_bh_disable();
 214         if (!atomic_dec_and_lock(&bss->users, &local->bss_lock)) {
 215                 local_bh_enable();
 216                 return;
 217         }
 218
 219         __ieee80211_rx_bss_hash_del(local, bss);
 220         list_del(&bss->list);
 221         spin_unlock_bh(&local->bss_lock);
 222         ieee80211_rx_bss_free(bss);
 223 }
 224
 225 struct ieee80211_bss *
 226 ieee80211_bss_info_update(struct ieee80211_local *local,
 227                           struct ieee80211_rx_status *rx_status,
 228                           struct ieee80211_mgmt *mgmt,
 229                           size_t len,
 230                           struct ieee802_11_elems *elems,
 231                           struct ieee80211_channel *channel,
 232                           bool beacon)
 233 {
 234         struct ieee80211_bss *bss;
 235         int clen, freq = channel->center_freq;
 236         enum cfg80211_signal_type sigtype = CFG80211_SIGNAL_TYPE_NONE;
 237         s32 signal = 0;
 238
 239         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) {
 240                 sigtype = CFG80211_SIGNAL_TYPE_MBM;
 241                 signal = rx_status->signal * 100;
 242         } else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) {
 243                 sigtype = CFG80211_SIGNAL_TYPE_UNSPEC;
 244                 signal = (rx_status->signal * 100) / local->hw.max_signal;
 245         }
 246
 247         cfg80211_put_bss(
 248                 cfg80211_inform_bss_frame(local->hw.wiphy, channel,
 249                                           mgmt, len, signal, sigtype,
 250                                           GFP_ATOMIC));
 251
 252 #ifdef CONFIG_MAC80211_MESH
 253         if (elems->mesh_config)
 254                 bss = ieee80211_rx_mesh_bss_get(local, elems->mesh_id,
 255                                 elems->mesh_id_len, elems->mesh_config, freq);
 256         else
 257 #endif
 258                 bss = ieee80211_rx_bss_get(local, mgmt->bssid, freq,
 259                                            elems->ssid, elems->ssid_len);
 260         if (!bss) {
 261 #ifdef CONFIG_MAC80211_MESH
 262                 if (elems->mesh_config)
 263                         bss = ieee80211_rx_mesh_bss_add(local, elems->mesh_id,
 264                                 elems->mesh_id_len, elems->mesh_config,
 265                                 elems->mesh_config_len, freq);
 266                 else
 267 #endif
 268                         bss = ieee80211_rx_bss_add(local, mgmt->bssid, freq,
 269                                                   elems->ssid, elems->ssid_len);
 270                 if (!bss)
 271                         return NULL;
 272         } else {
 273 #if 0
 274                 /* TODO: order by RSSI? */
 275                 spin_lock_bh(&local->bss_lock);
 276                 list_move_tail(&bss->list, &local->bss_list);
 277                 spin_unlock_bh(&local->bss_lock);
 278 #endif
 279         }
 280
 281         /* save the ERP value so that it is available at association time */
 282         if (elems->erp_info && elems->erp_info_len >= 1) {
 283                 bss->erp_value = elems->erp_info[0];
 284                 bss->has_erp_value = 1;
 285         }
 286
 287         bss->beacon_int = le16_to_cpu(mgmt->u.beacon.beacon_int);
 288         bss->capability = le16_to_cpu(mgmt->u.beacon.capab_info);
 289
 290         if (elems->tim) {
 291                 struct ieee80211_tim_ie *tim_ie =
 292                         (struct ieee80211_tim_ie *)elems->tim;
 293                 bss->dtim_period = tim_ie->dtim_period;
 294         }
 295
 296         /* set default value for buggy APs */
 297         if (!elems->tim || bss->dtim_period == 0)
 298                 bss->dtim_period = 1;
 299
 300         bss->supp_rates_len = 0;
 301         if (elems->supp_rates) {
 302                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
 303                 if (clen > elems->supp_rates_len)
 304                         clen = elems->supp_rates_len;
 305                 memcpy(&bss->supp_rates[bss->supp_rates_len], elems->supp_rates,
 306                        clen);
 307                 bss->supp_rates_len += clen;
 308         }
 309         if (elems->ext_supp_rates) {
 310                 clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;
 311                 if (clen > elems->ext_supp_rates_len)
 312                         clen = elems->ext_supp_rates_len;
 313                 memcpy(&bss->supp_rates[bss->supp_rates_len],
 314                        elems->ext_supp_rates, clen);
 315                 bss->supp_rates_len += clen;
 316         }
 317
 318         bss->band = rx_status->band;
 319
 320         bss->timestamp = le64_to_cpu(mgmt->u.beacon.timestamp);
 321         bss->last_update = jiffies;
 322         bss->signal = rx_status->signal;
 323         bss->noise = rx_status->noise;
 324         bss->qual = rx_status->qual;
 325         bss->wmm_used = elems->wmm_param || elems->wmm_info;
 326
 327         if (!beacon)
 328                 bss->last_probe_resp = jiffies;
 329
 330         /*
 331          * For probe responses, or if we don't have any information yet,
 332          * use the IEs from the beacon.
 333          */
 334         if (!bss->ies || !beacon) {
 335                 if (bss->ies == NULL || bss->ies_len < elems->total_len) {
 336                         kfree(bss->ies);
 337                         bss->ies = kmalloc(elems->total_len, GFP_ATOMIC);
 338                 }
 339                 if (bss->ies) {
 340                         memcpy(bss->ies, elems->ie_start, elems->total_len);
 341                         bss->ies_len = elems->total_len;
 342                 } else
 343                         bss->ies_len = 0;
 344         }
 345
 346         return bss;
 347 }
 348
 349 void ieee80211_rx_bss_remove(struct ieee80211_sub_if_data *sdata, u8 *bssid,
 350                              int freq, u8 *ssid, u8 ssid_len)
 351 {
 352         struct ieee80211_bss *bss;
 353         struct ieee80211_local *local = sdata->local;
 354
 355         bss = ieee80211_rx_bss_get(local, bssid, freq, ssid, ssid_len);
 356         if (bss) {
 357                 atomic_dec(&bss->users);
 358                 ieee80211_rx_bss_put(local, bss);
 359         }
 360 }
 361
 362 ieee80211_rx_result
 363 ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 364                   struct ieee80211_rx_status *rx_status)
 365 {
 366         struct ieee80211_mgmt *mgmt;
 367         struct ieee80211_bss *bss;
 368         u8 *elements;
 369         struct ieee80211_channel *channel;
 370         size_t baselen;
 371         int freq;
 372         __le16 fc;
 373         bool presp, beacon = false;
 374         struct ieee802_11_elems elems;
 375
 376         if (skb->len < 2)
 377                 return RX_DROP_UNUSABLE;
 378
 379         mgmt = (struct ieee80211_mgmt *) skb->data;
 380         fc = mgmt->frame_control;
 381
 382         if (ieee80211_is_ctl(fc))
 383                 return RX_CONTINUE;
 384
 385         if (skb->len < 24)
 386                 return RX_DROP_MONITOR;
 387
 388         presp = ieee80211_is_probe_resp(fc);
 389         if (presp) {
 390                 /* ignore ProbeResp to foreign address */
 391                 if (memcmp(mgmt->da, sdata->dev->dev_addr, ETH_ALEN))
 392                         return RX_DROP_MONITOR;
 393
 394                 presp = true;
 395                 elements = mgmt->u.probe_resp.variable;
 396                 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
 397         } else {
 398                 beacon = ieee80211_is_beacon(fc);
 399                 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
 400                 elements = mgmt->u.beacon.variable;
 401         }
 402
 403         if (!presp && !beacon)
 404                 return RX_CONTINUE;
 405
 406         if (baselen > skb->len)
 407                 return RX_DROP_MONITOR;
 408
 409         ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
 410
 411         if (elems.ds_params && elems.ds_params_len == 1)
 412                 freq = ieee80211_channel_to_frequency(elems.ds_params[0]);
 413         else
 414                 freq = rx_status->freq;
 415
 416         channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
 417
 418         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 419                 return RX_DROP_MONITOR;
 420
 421         bss = ieee80211_bss_info_update(sdata->local, rx_status,
 422                                         mgmt, skb->len, &elems,
 423                                         channel, beacon);
 424         if (bss)
 425                 ieee80211_rx_bss_put(sdata->local, bss);
 426
 427         dev_kfree_skb(skb);
 428         return RX_QUEUED;
 429 }
 430
 431 void ieee80211_send_nullfunc(struct ieee80211_local *local,
 432                                     struct ieee80211_sub_if_data *sdata,
 433                                     int powersave)
 434 {
 435         struct sk_buff *skb;
 436         struct ieee80211_hdr *nullfunc;
 437         __le16 fc;
 438
 439         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
 440         if (!skb) {
 441                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
 442                        "frame\n", sdata->dev->name);
 443                 return;
 444         }
 445         skb_reserve(skb, local->hw.extra_tx_headroom);
 446
 447         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
 448         memset(nullfunc, 0, 24);
 449         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 450                          IEEE80211_FCTL_TODS);
 451         if (powersave)
 452                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 453         nullfunc->frame_control = fc;
 454         memcpy(nullfunc->addr1, sdata->u.sta.bssid, ETH_ALEN);
 455         memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
 456         memcpy(nullfunc->addr3, sdata->u.sta.bssid, ETH_ALEN);
 457
 458         ieee80211_tx_skb(sdata, skb, 0);
 459 }
 460
 461 void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
 462 {
 463         struct ieee80211_local *local = hw_to_local(hw);
 464         struct ieee80211_sub_if_data *sdata;
 465
 466         if (WARN_ON(!local->hw_scanning && !local->sw_scanning))
 467                 return;
 468
 469         if (WARN_ON(!local->scan_req))
 470                 return;
 471
 472         if (local->scan_req != &local->int_scan_req)
 473                 cfg80211_scan_done(local->scan_req, aborted);
 474         local->scan_req = NULL;
 475
 476         local->last_scan_completed = jiffies;
 477
 478         if (local->hw_scanning) {
 479                 local->hw_scanning = false;
 480                 /*
 481                  * Somebody might have requested channel change during scan
 482                  * that we won't have acted upon, try now. ieee80211_hw_config
 483                  * will set the flag based on actual changes.
 484                  */
 485                 ieee80211_hw_config(local, 0);
 486                 goto done;
 487         }
 488
 489         local->sw_scanning = false;
 490         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 491
 492         netif_tx_lock_bh(local->mdev);
 493         netif_addr_lock(local->mdev);
 494         local->filter_flags &= ~FIF_BCN_PRBRESP_PROMISC;
 495         local->ops->configure_filter(local_to_hw(local),
 496                                      FIF_BCN_PRBRESP_PROMISC,
 497                                      &local->filter_flags,
 498                                      local->mdev->mc_count,
 499                                      local->mdev->mc_list);
 500
 501         netif_addr_unlock(local->mdev);
 502         netif_tx_unlock_bh(local->mdev);
 503
 504         mutex_lock(&local->iflist_mtx);
 505         list_for_each_entry(sdata, &local->interfaces, list) {
 506                 if (!netif_running(sdata->dev))
 507                         continue;
 508
 509                 /* Tell AP we're back */
 510                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 511                         if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
 512                                 ieee80211_send_nullfunc(local, sdata, 0);
 513                                 netif_tx_wake_all_queues(sdata->dev);
 514                         }
 515                 } else
 516                         netif_tx_wake_all_queues(sdata->dev);
 517
 518                 /* re-enable beaconing */
 519                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 520                     sdata->vif.type == NL80211_IFTYPE_ADHOC ||
 521                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 522                         ieee80211_if_config(sdata,
 523                                             IEEE80211_IFCC_BEACON_ENABLED);
 524         }
 525         mutex_unlock(&local->iflist_mtx);
 526
 527  done:
 528         ieee80211_mlme_notify_scan_completed(local);
 529         ieee80211_mesh_notify_scan_completed(local);
 530 }
 531 EXPORT_SYMBOL(ieee80211_scan_completed);
 532
 533 void ieee80211_scan_work(struct work_struct *work)
 534 {
 535         struct ieee80211_local *local =
 536                 container_of(work, struct ieee80211_local, scan_work.work);
 537         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
 538         struct ieee80211_channel *chan;
 539         int skip, i;
 540         unsigned long next_delay = 0;
 541
 542         /*
 543          * Avoid re-scheduling when the sdata is going away.
 544          */
 545         if (!netif_running(sdata->dev))
 546                 return;
 547
 548         switch (local->scan_state) {
 549         case SCAN_SET_CHANNEL:
 550                 /* if no more bands/channels left, complete scan */
 551                 if (local->scan_channel_idx >= local->scan_req->n_channels) {
 552                         ieee80211_scan_completed(local_to_hw(local), false);
 553                         return;
 554                 }
 555                 skip = 0;
 556                 chan = local->scan_req->channels[local->scan_channel_idx];
 557
 558                 if (chan->flags & IEEE80211_CHAN_DISABLED ||
 559                     (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 560                      chan->flags & IEEE80211_CHAN_NO_IBSS))
 561                         skip = 1;
 562
 563                 if (!skip) {
 564                         local->scan_channel = chan;
 565                         if (ieee80211_hw_config(local,
 566                                                 IEEE80211_CONF_CHANGE_CHANNEL))
 567                                 skip = 1;
 568                 }
 569
 570                 /* advance state machine to next channel/band */
 571                 local->scan_channel_idx++;
 572
 573                 if (skip)
 574                         break;
 575
 576                 next_delay = IEEE80211_PROBE_DELAY +
 577                              usecs_to_jiffies(local->hw.channel_change_time);
 578                 local->scan_state = SCAN_SEND_PROBE;
 579                 break;
 580         case SCAN_SEND_PROBE:
 581                 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
 582                 local->scan_state = SCAN_SET_CHANNEL;
 583
 584                 if (local->scan_channel->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
 585                     !local->scan_req->n_ssids)
 586                         break;
 587                 for (i = 0; i < local->scan_req->n_ssids; i++)
 588                         ieee80211_send_probe_req(
 589                                 sdata, NULL,
 590                                 local->scan_req->ssids[i].ssid,
 591                                 local->scan_req->ssids[i].ssid_len);
 592                 next_delay = IEEE80211_CHANNEL_TIME;
 593                 break;
 594         }
 595
 596         queue_delayed_work(local->hw.workqueue, &local->scan_work,
 597                            next_delay);
 598 }
 599
 600
 601 int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
 602                          struct cfg80211_scan_request *req)
 603 {
 604         struct ieee80211_local *local = scan_sdata->local;
 605         struct ieee80211_sub_if_data *sdata;
 606
 607         if (!req)
 608                 return -EINVAL;
 609
 610         if (local->scan_req && local->scan_req != req)
 611                 return -EBUSY;
 612
 613         local->scan_req = req;
 614
 615         /* MLME-SCAN.request (page 118)  page 144 (11.1.3.1)
 616          * BSSType: INFRASTRUCTURE, INDEPENDENT, ANY_BSS
 617          * BSSID: MACAddress
 618          * SSID
 619          * ScanType: ACTIVE, PASSIVE
 620          * ProbeDelay: delay (in microseconds) to be used prior to transmitting
 621          *    a Probe frame during active scanning
 622          * ChannelList
 623          * MinChannelTime (>= ProbeDelay), in TU
 624          * MaxChannelTime: (>= MinChannelTime), in TU
 625          */
 626
 627          /* MLME-SCAN.confirm
 628           * BSSDescriptionSet
 629           * ResultCode: SUCCESS, INVALID_PARAMETERS
 630          */
 631
 632         if (local->sw_scanning || local->hw_scanning) {
 633                 if (local->scan_sdata == scan_sdata)
 634                         return 0;
 635                 return -EBUSY;
 636         }
 637
 638         if (local->ops->hw_scan) {
 639                 int rc;
 640
 641                 local->hw_scanning = true;
 642                 rc = local->ops->hw_scan(local_to_hw(local), req);
 643                 if (rc) {
 644                         local->hw_scanning = false;
 645                         return rc;
 646                 }
 647                 local->scan_sdata = scan_sdata;
 648                 return 0;
 649         }
 650
 651         local->sw_scanning = true;
 652
 653         mutex_lock(&local->iflist_mtx);
 654         list_for_each_entry(sdata, &local->interfaces, list) {
 655                 if (!netif_running(sdata->dev))
 656                         continue;
 657
 658                 /* disable beaconing */
 659                 if (sdata->vif.type == NL80211_IFTYPE_AP ||
 660                     sdata->vif.type == NL80211_IFTYPE_ADHOC ||
 661                     sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 662                         ieee80211_if_config(sdata,
 663                                             IEEE80211_IFCC_BEACON_ENABLED);
 664
 665                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 666                         if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
 667                                 netif_tx_stop_all_queues(sdata->dev);
 668                                 ieee80211_send_nullfunc(local, sdata, 1);
 669                         }
 670                 } else
 671                         netif_tx_stop_all_queues(sdata->dev);
 672         }
 673         mutex_unlock(&local->iflist_mtx);
 674
 675         local->scan_state = SCAN_SET_CHANNEL;
 676         local->scan_channel_idx = 0;
 677         local->scan_sdata = scan_sdata;
 678         local->scan_req = req;
 679
 680         netif_addr_lock_bh(local->mdev);
 681         local->filter_flags |= FIF_BCN_PRBRESP_PROMISC;
 682         local->ops->configure_filter(local_to_hw(local),
 683                                      FIF_BCN_PRBRESP_PROMISC,
 684                                      &local->filter_flags,
 685                                      local->mdev->mc_count,
 686                                      local->mdev->mc_list);
 687         netif_addr_unlock_bh(local->mdev);
 688
 689         /* TODO: start scan as soon as all nullfunc frames are ACKed */
 690         queue_delayed_work(local->hw.workqueue, &local->scan_work,
 691                            IEEE80211_CHANNEL_TIME);
 692
 693         return 0;
 694 }
 695
 696
 697 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
 698                            struct cfg80211_scan_request *req)
 699 {
 700         struct ieee80211_local *local = sdata->local;
 701         struct ieee80211_if_sta *ifsta;
 702
 703         if (!req)
 704                 return -EINVAL;
 705
 706         if (local->scan_req && local->scan_req != req)
 707                 return -EBUSY;
 708
 709         local->scan_req = req;
 710
 711         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 712                 return ieee80211_start_scan(sdata, req);
 713
 714         /*
 715          * STA has a state machine that might need to defer scanning
 716          * while it's trying to associate/authenticate, therefore we
 717          * queue it up to the state machine in that case.
 718          */
 719
 720         if (local->sw_scanning || local->hw_scanning) {
 721                 if (local->scan_sdata == sdata)
 722                         return 0;
 723                 return -EBUSY;
 724         }
 725
 726         ifsta = &sdata->u.sta;
 727         set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
 728         queue_work(local->hw.workqueue, &ifsta->work);
 729
 730         return 0;
 731 }