net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <linux/pm_qos_params.h>
  25 #include <net/net_namespace.h>
  26 #include <net/cfg80211.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "wme.h"
  34 #include "aes_ccm.h"
  35 #include "led.h"
  36 #include "cfg.h"
  37 #include "debugfs.h"
  38 #include "debugfs_netdev.h"
  39
  40 /*
  41  * For seeing transmitted packets on monitor interfaces
  42  * we have a radiotap header too.
  43  */
  44 struct ieee80211_tx_status_rtap_hdr {
  45         struct ieee80211_radiotap_header hdr;
  46         u8 rate;
  47         u8 padding_for_rate;
  48         __le16 tx_flags;
  49         u8 data_retries;
  50 } __attribute__ ((packed));
  51
  52
  53 /* must be called under mdev tx lock */
  54 void ieee80211_configure_filter(struct ieee80211_local *local)
  55 {
  56         unsigned int changed_flags;
  57         unsigned int new_flags = 0;
  58
  59         if (atomic_read(&local->iff_promiscs))
  60                 new_flags |= FIF_PROMISC_IN_BSS;
  61
  62         if (atomic_read(&local->iff_allmultis))
  63                 new_flags |= FIF_ALLMULTI;
  64
  65         if (local->monitors)
  66                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  67
  68         if (local->fif_fcsfail)
  69                 new_flags |= FIF_FCSFAIL;
  70
  71         if (local->fif_plcpfail)
  72                 new_flags |= FIF_PLCPFAIL;
  73
  74         if (local->fif_control)
  75                 new_flags |= FIF_CONTROL;
  76
  77         if (local->fif_other_bss)
  78                 new_flags |= FIF_OTHER_BSS;
  79
  80         changed_flags = local->filter_flags ^ new_flags;
  81
  82         /* be a bit nasty */
  83         new_flags |= (1<<31);
  84
  85         drv_configure_filter(local, changed_flags, &new_flags,
  86                              local->mdev->mc_count,
  87                              local->mdev->mc_list);
  88
  89         WARN_ON(new_flags & (1<<31));
  90
  91         local->filter_flags = new_flags & ~(1<<31);
  92 }
  93
  94 /* master interface */
  95
  96 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  97 {
  98         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  99         return ETH_ALEN;
 100 }
 101
 102 static const struct header_ops ieee80211_header_ops = {
 103         .create         = eth_header,
 104         .parse          = header_parse_80211,
 105         .rebuild        = eth_rebuild_header,
 106         .cache          = eth_header_cache,
 107         .cache_update   = eth_header_cache_update,
 108 };
 109
 110 static int ieee80211_master_open(struct net_device *dev)
 111 {
 112         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 113         struct ieee80211_local *local = mpriv->local;
 114         struct ieee80211_sub_if_data *sdata;
 115         int res = -EOPNOTSUPP;
 116
 117         /* we hold the RTNL here so can safely walk the list */
 118         list_for_each_entry(sdata, &local->interfaces, list) {
 119                 if (netif_running(sdata->dev)) {
 120                         res = 0;
 121                         break;
 122                 }
 123         }
 124
 125         if (res)
 126                 return res;
 127
 128         netif_tx_start_all_queues(local->mdev);
 129
 130         return 0;
 131 }
 132
 133 static int ieee80211_master_stop(struct net_device *dev)
 134 {
 135         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 136         struct ieee80211_local *local = mpriv->local;
 137         struct ieee80211_sub_if_data *sdata;
 138
 139         /* we hold the RTNL here so can safely walk the list */
 140         list_for_each_entry(sdata, &local->interfaces, list)
 141                 if (netif_running(sdata->dev))
 142                         dev_close(sdata->dev);
 143
 144         return 0;
 145 }
 146
 147 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 148 {
 149         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 150         struct ieee80211_local *local = mpriv->local;
 151
 152         ieee80211_configure_filter(local);
 153 }
 154
 155 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 156 {
 157         struct ieee80211_channel *chan, *scan_chan;
 158         int ret = 0;
 159         int power;
 160         enum nl80211_channel_type channel_type;
 161
 162         might_sleep();
 163
 164         scan_chan = local->scan_channel;
 165
 166         if (scan_chan) {
 167                 chan = scan_chan;
 168                 channel_type = NL80211_CHAN_NO_HT;
 169         } else {
 170                 chan = local->oper_channel;
 171                 channel_type = local->oper_channel_type;
 172         }
 173
 174         if (chan != local->hw.conf.channel ||
 175             channel_type != local->hw.conf.channel_type) {
 176                 local->hw.conf.channel = chan;
 177                 local->hw.conf.channel_type = channel_type;
 178                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 179         }
 180
 181         if (scan_chan)
 182                 power = chan->max_power;
 183         else
 184                 power = local->power_constr_level ?
 185                         (chan->max_power - local->power_constr_level) :
 186                         chan->max_power;
 187
 188         if (local->user_power_level >= 0)
 189                 power = min(power, local->user_power_level);
 190
 191         if (local->hw.conf.power_level != power) {
 192                 changed |= IEEE80211_CONF_CHANGE_POWER;
 193                 local->hw.conf.power_level = power;
 194         }
 195
 196         if (changed && local->open_count) {
 197                 ret = drv_config(local, changed);
 198                 /*
 199                  * Goal:
 200                  * HW reconfiguration should never fail, the driver has told
 201                  * us what it can support so it should live up to that promise.
 202                  *
 203                  * Current status:
 204                  * rfkill is not integrated with mac80211 and a
 205                  * configuration command can thus fail if hardware rfkill
 206                  * is enabled
 207                  *
 208                  * FIXME: integrate rfkill with mac80211 and then add this
 209                  * WARN_ON() back
 210                  *
 211                  */
 212                 /* WARN_ON(ret); */
 213         }
 214
 215         return ret;
 216 }
 217
 218 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 219                                       u32 changed)
 220 {
 221         struct ieee80211_local *local = sdata->local;
 222         static const u8 zero[ETH_ALEN] = { 0 };
 223
 224         if (!changed)
 225                 return;
 226
 227         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 228                 /*
 229                  * While not associated, claim a BSSID of all-zeroes
 230                  * so that drivers don't do any weird things with the
 231                  * BSSID at that time.
 232                  */
 233                 if (sdata->vif.bss_conf.assoc)
 234                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 235                 else
 236                         sdata->vif.bss_conf.bssid = zero;
 237         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 238                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 239         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 240                 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
 241         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 242                 sdata->vif.bss_conf.bssid = zero;
 243         } else {
 244                 WARN_ON(1);
 245                 return;
 246         }
 247
 248         switch (sdata->vif.type) {
 249         case NL80211_IFTYPE_AP:
 250         case NL80211_IFTYPE_ADHOC:
 251         case NL80211_IFTYPE_MESH_POINT:
 252                 break;
 253         default:
 254                 /* do not warn to simplify caller in scan.c */
 255                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 256                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 257                         return;
 258                 break;
 259         }
 260
 261         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 262                 if (local->sw_scanning) {
 263                         sdata->vif.bss_conf.enable_beacon = false;
 264                 } else {
 265                         /*
 266                          * Beacon should be enabled, but AP mode must
 267                          * check whether there is a beacon configured.
 268                          */
 269                         switch (sdata->vif.type) {
 270                         case NL80211_IFTYPE_AP:
 271                                 sdata->vif.bss_conf.enable_beacon =
 272                                         !!rcu_dereference(sdata->u.ap.beacon);
 273                                 break;
 274                         case NL80211_IFTYPE_ADHOC:
 275                                 sdata->vif.bss_conf.enable_beacon =
 276                                         !!rcu_dereference(sdata->u.ibss.presp);
 277                                 break;
 278                         case NL80211_IFTYPE_MESH_POINT:
 279                                 sdata->vif.bss_conf.enable_beacon = true;
 280                                 break;
 281                         default:
 282                                 /* not reached */
 283                                 WARN_ON(1);
 284                                 break;
 285                         }
 286                 }
 287         }
 288
 289         drv_bss_info_changed(local, &sdata->vif,
 290                              &sdata->vif.bss_conf, changed);
 291
 292         /* DEPRECATED */
 293         local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
 294 }
 295
 296 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 297 {
 298         sdata->vif.bss_conf.use_cts_prot = false;
 299         sdata->vif.bss_conf.use_short_preamble = false;
 300         sdata->vif.bss_conf.use_short_slot = false;
 301         return BSS_CHANGED_ERP_CTS_PROT |
 302                BSS_CHANGED_ERP_PREAMBLE |
 303                BSS_CHANGED_ERP_SLOT;
 304 }
 305
 306 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 307                                  struct sk_buff *skb)
 308 {
 309         struct ieee80211_local *local = hw_to_local(hw);
 310         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 311         int tmp;
 312
 313         skb->dev = local->mdev;
 314         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 315         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 316                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 317         tmp = skb_queue_len(&local->skb_queue) +
 318                 skb_queue_len(&local->skb_queue_unreliable);
 319         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 320                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 321                 dev_kfree_skb_irq(skb);
 322                 tmp--;
 323                 I802_DEBUG_INC(local->tx_status_drop);
 324         }
 325         tasklet_schedule(&local->tasklet);
 326 }
 327 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 328
 329 static void ieee80211_tasklet_handler(unsigned long data)
 330 {
 331         struct ieee80211_local *local = (struct ieee80211_local *) data;
 332         struct sk_buff *skb;
 333         struct ieee80211_ra_tid *ra_tid;
 334
 335         while ((skb = skb_dequeue(&local->skb_queue)) ||
 336                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 337                 switch (skb->pkt_type) {
 338                 case IEEE80211_RX_MSG:
 339                         /* Clear skb->pkt_type in order to not confuse kernel
 340                          * netstack. */
 341                         skb->pkt_type = 0;
 342                         ieee80211_rx(local_to_hw(local), skb);
 343                         break;
 344                 case IEEE80211_TX_STATUS_MSG:
 345                         skb->pkt_type = 0;
 346                         ieee80211_tx_status(local_to_hw(local), skb);
 347                         break;
 348                 case IEEE80211_DELBA_MSG:
 349                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 350                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 351                                                 ra_tid->ra, ra_tid->tid);
 352                         dev_kfree_skb(skb);
 353                         break;
 354                 case IEEE80211_ADDBA_MSG:
 355                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 356                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 357                                                  ra_tid->ra, ra_tid->tid);
 358                         dev_kfree_skb(skb);
 359                         break ;
 360                 default:
 361                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 362                              skb->pkt_type);
 363                         dev_kfree_skb(skb);
 364                         break;
 365                 }
 366         }
 367 }
 368
 369 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 370                                             struct sta_info *sta,
 371                                             struct sk_buff *skb)
 372 {
 373         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 374
 375         sta->tx_filtered_count++;
 376
 377         /*
 378          * Clear the TX filter mask for this STA when sending the next
 379          * packet. If the STA went to power save mode, this will happen
 380          * when it wakes up for the next time.
 381          */
 382         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 383
 384         /*
 385          * This code races in the following way:
 386          *
 387          *  (1) STA sends frame indicating it will go to sleep and does so
 388          *  (2) hardware/firmware adds STA to filter list, passes frame up
 389          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 390          *  (4) we get TX status before having processed the frame and
 391          *      knowing that the STA has gone to sleep.
 392          *
 393          * This is actually quite unlikely even when both those events are
 394          * processed from interrupts coming in quickly after one another or
 395          * even at the same time because we queue both TX status events and
 396          * RX frames to be processed by a tasklet and process them in the
 397          * same order that they were received or TX status last. Hence, there
 398          * is no race as long as the frame RX is processed before the next TX
 399          * status, which drivers can ensure, see below.
 400          *
 401          * Note that this can only happen if the hardware or firmware can
 402          * actually add STAs to the filter list, if this is done by the
 403          * driver in response to set_tim() (which will only reduce the race
 404          * this whole filtering tries to solve, not completely solve it)
 405          * this situation cannot happen.
 406          *
 407          * To completely solve this race drivers need to make sure that they
 408          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 409          *      functions and
 410          *  (b) always process RX events before TX status events if ordering
 411          *      can be unknown, for example with different interrupt status
 412          *      bits.
 413          */
 414         if (test_sta_flags(sta, WLAN_STA_PS) &&
 415             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 416                 skb_queue_tail(&sta->tx_filtered, skb);
 417                 return;
 418         }
 419
 420         if (!test_sta_flags(sta, WLAN_STA_PS) &&
 421             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 422                 /* Software retry the packet once */
 423                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
 424                 ieee80211_add_pending_skb(local, skb);
 425                 return;
 426         }
 427
 428 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 429         if (net_ratelimit())
 430                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 431                        "queue_len=%d PS=%d @%lu\n",
 432                        wiphy_name(local->hw.wiphy),
 433                        skb_queue_len(&sta->tx_filtered),
 434                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 435 #endif
 436         dev_kfree_skb(skb);
 437 }
 438
 439 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 440 {
 441         struct sk_buff *skb2;
 442         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 443         struct ieee80211_local *local = hw_to_local(hw);
 444         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 445         u16 frag, type;
 446         __le16 fc;
 447         struct ieee80211_supported_band *sband;
 448         struct ieee80211_tx_status_rtap_hdr *rthdr;
 449         struct ieee80211_sub_if_data *sdata;
 450         struct net_device *prev_dev = NULL;
 451         struct sta_info *sta;
 452         int retry_count = -1, i;
 453
 454         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 455                 /* the HW cannot have attempted that rate */
 456                 if (i >= hw->max_rates) {
 457                         info->status.rates[i].idx = -1;
 458                         info->status.rates[i].count = 0;
 459                 }
 460
 461                 retry_count += info->status.rates[i].count;
 462         }
 463         if (retry_count < 0)
 464                 retry_count = 0;
 465
 466         rcu_read_lock();
 467
 468         sband = local->hw.wiphy->bands[info->band];
 469
 470         sta = sta_info_get(local, hdr->addr1);
 471
 472         if (sta) {
 473                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 474                     test_sta_flags(sta, WLAN_STA_PS)) {
 475                         /*
 476                          * The STA is in power save mode, so assume
 477                          * that this TX packet failed because of that.
 478                          */
 479                         ieee80211_handle_filtered_frame(local, sta, skb);
 480                         rcu_read_unlock();
 481                         return;
 482                 }
 483
 484                 fc = hdr->frame_control;
 485
 486                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 487                     (ieee80211_is_data_qos(fc))) {
 488                         u16 tid, ssn;
 489                         u8 *qc;
 490
 491                         qc = ieee80211_get_qos_ctl(hdr);
 492                         tid = qc[0] & 0xf;
 493                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 494                                                 & IEEE80211_SCTL_SEQ);
 495                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 496                                            tid, ssn);
 497                 }
 498
 499                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 500                         ieee80211_handle_filtered_frame(local, sta, skb);
 501                         rcu_read_unlock();
 502                         return;
 503                 } else {
 504                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 505                                 sta->tx_retry_failed++;
 506                         sta->tx_retry_count += retry_count;
 507                 }
 508
 509                 rate_control_tx_status(local, sband, sta, skb);
 510         }
 511
 512         rcu_read_unlock();
 513
 514         ieee80211_led_tx(local, 0);
 515
 516         /* SNMP counters
 517          * Fragments are passed to low-level drivers as separate skbs, so these
 518          * are actually fragments, not frames. Update frame counters only for
 519          * the first fragment of the frame. */
 520
 521         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 522         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 523
 524         if (info->flags & IEEE80211_TX_STAT_ACK) {
 525                 if (frag == 0) {
 526                         local->dot11TransmittedFrameCount++;
 527                         if (is_multicast_ether_addr(hdr->addr1))
 528                                 local->dot11MulticastTransmittedFrameCount++;
 529                         if (retry_count > 0)
 530                                 local->dot11RetryCount++;
 531                         if (retry_count > 1)
 532                                 local->dot11MultipleRetryCount++;
 533                 }
 534
 535                 /* This counter shall be incremented for an acknowledged MPDU
 536                  * with an individual address in the address 1 field or an MPDU
 537                  * with a multicast address in the address 1 field of type Data
 538                  * or Management. */
 539                 if (!is_multicast_ether_addr(hdr->addr1) ||
 540                     type == IEEE80211_FTYPE_DATA ||
 541                     type == IEEE80211_FTYPE_MGMT)
 542                         local->dot11TransmittedFragmentCount++;
 543         } else {
 544                 if (frag == 0)
 545                         local->dot11FailedCount++;
 546         }
 547
 548         /* this was a transmitted frame, but now we want to reuse it */
 549         skb_orphan(skb);
 550
 551         /*
 552          * This is a bit racy but we can avoid a lot of work
 553          * with this test...
 554          */
 555         if (!local->monitors && !local->cooked_mntrs) {
 556                 dev_kfree_skb(skb);
 557                 return;
 558         }
 559
 560         /* send frame to monitor interfaces now */
 561
 562         if (skb_headroom(skb) < sizeof(*rthdr)) {
 563                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 564                 dev_kfree_skb(skb);
 565                 return;
 566         }
 567
 568         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 569                                 skb_push(skb, sizeof(*rthdr));
 570
 571         memset(rthdr, 0, sizeof(*rthdr));
 572         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 573         rthdr->hdr.it_present =
 574                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 575                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 576                             (1 << IEEE80211_RADIOTAP_RATE));
 577
 578         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 579             !is_multicast_ether_addr(hdr->addr1))
 580                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 581
 582         /*
 583          * XXX: Once radiotap gets the bitmap reset thing the vendor
 584          *      extensions proposal contains, we can actually report
 585          *      the whole set of tries we did.
 586          */
 587         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 588             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 589                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 590         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 591                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 592         if (info->status.rates[0].idx >= 0 &&
 593             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 594                 rthdr->rate = sband->bitrates[
 595                                 info->status.rates[0].idx].bitrate / 5;
 596
 597         /* for now report the total retry_count */
 598         rthdr->data_retries = retry_count;
 599
 600         /* XXX: is this sufficient for BPF? */
 601         skb_set_mac_header(skb, 0);
 602         skb->ip_summed = CHECKSUM_UNNECESSARY;
 603         skb->pkt_type = PACKET_OTHERHOST;
 604         skb->protocol = htons(ETH_P_802_2);
 605         memset(skb->cb, 0, sizeof(skb->cb));
 606
 607         rcu_read_lock();
 608         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 609                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 610                         if (!netif_running(sdata->dev))
 611                                 continue;
 612
 613                         if (prev_dev) {
 614                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 615                                 if (skb2) {
 616                                         skb2->dev = prev_dev;
 617                                         netif_rx(skb2);
 618                                 }
 619                         }
 620
 621                         prev_dev = sdata->dev;
 622                 }
 623         }
 624         if (prev_dev) {
 625                 skb->dev = prev_dev;
 626                 netif_rx(skb);
 627                 skb = NULL;
 628         }
 629         rcu_read_unlock();
 630         dev_kfree_skb(skb);
 631 }
 632 EXPORT_SYMBOL(ieee80211_tx_status);
 633
 634 static void ieee80211_restart_work(struct work_struct *work)
 635 {
 636         struct ieee80211_local *local =
 637                 container_of(work, struct ieee80211_local, restart_work);
 638
 639         rtnl_lock();
 640         ieee80211_reconfig(local);
 641         rtnl_unlock();
 642 }
 643
 644 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 645 {
 646         struct ieee80211_local *local = hw_to_local(hw);
 647
 648         /* use this reason, __ieee80211_resume will unblock it */
 649         ieee80211_stop_queues_by_reason(hw,
 650                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 651
 652         schedule_work(&local->restart_work);
 653 }
 654 EXPORT_SYMBOL(ieee80211_restart_hw);
 655
 656 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 657                                         const struct ieee80211_ops *ops)
 658 {
 659         struct ieee80211_local *local;
 660         int priv_size, i;
 661         struct wiphy *wiphy;
 662
 663         /* Ensure 32-byte alignment of our private data and hw private data.
 664          * We use the wiphy priv data for both our ieee80211_local and for
 665          * the driver's private data
 666          *
 667          * In memory it'll be like this:
 668          *
 669          * +-------------------------+
 670          * | struct wiphy           |
 671          * +-------------------------+
 672          * | struct ieee80211_local  |
 673          * +-------------------------+
 674          * | driver's private data   |
 675          * +-------------------------+
 676          *
 677          */
 678         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 679
 680         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 681
 682         if (!wiphy)
 683                 return NULL;
 684
 685         wiphy->privid = mac80211_wiphy_privid;
 686
 687         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 688         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 689                                sizeof(struct cfg80211_bss);
 690
 691         local = wiphy_priv(wiphy);
 692
 693         local->hw.wiphy = wiphy;
 694
 695         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 696
 697         BUG_ON(!ops->tx);
 698         BUG_ON(!ops->start);
 699         BUG_ON(!ops->stop);
 700         BUG_ON(!ops->config);
 701         BUG_ON(!ops->add_interface);
 702         BUG_ON(!ops->remove_interface);
 703         BUG_ON(!ops->configure_filter);
 704         local->ops = ops;
 705
 706         /* set up some defaults */
 707         local->hw.queues = 1;
 708         local->hw.max_rates = 1;
 709         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 710         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 711         local->hw.conf.radio_enabled = true;
 712         local->user_power_level = -1;
 713
 714         INIT_LIST_HEAD(&local->interfaces);
 715         mutex_init(&local->iflist_mtx);
 716         mutex_init(&local->scan_mtx);
 717
 718         spin_lock_init(&local->key_lock);
 719
 720         spin_lock_init(&local->queue_stop_reason_lock);
 721
 722         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 723
 724         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 725
 726         INIT_WORK(&local->dynamic_ps_enable_work,
 727                   ieee80211_dynamic_ps_enable_work);
 728         INIT_WORK(&local->dynamic_ps_disable_work,
 729                   ieee80211_dynamic_ps_disable_work);
 730         setup_timer(&local->dynamic_ps_timer,
 731                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 732
 733         sta_info_init(local);
 734
 735         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 736                 skb_queue_head_init(&local->pending[i]);
 737         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 738                      (unsigned long)local);
 739         tasklet_disable(&local->tx_pending_tasklet);
 740
 741         tasklet_init(&local->tasklet,
 742                      ieee80211_tasklet_handler,
 743                      (unsigned long) local);
 744         tasklet_disable(&local->tasklet);
 745
 746         skb_queue_head_init(&local->skb_queue);
 747         skb_queue_head_init(&local->skb_queue_unreliable);
 748
 749         spin_lock_init(&local->ampdu_lock);
 750
 751         return local_to_hw(local);
 752 }
 753 EXPORT_SYMBOL(ieee80211_alloc_hw);
 754
 755 static const struct net_device_ops ieee80211_master_ops = {
 756         .ndo_start_xmit = ieee80211_master_start_xmit,
 757         .ndo_open = ieee80211_master_open,
 758         .ndo_stop = ieee80211_master_stop,
 759         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
 760         .ndo_select_queue = ieee80211_select_queue,
 761 };
 762
 763 static void ieee80211_master_setup(struct net_device *mdev)
 764 {
 765         mdev->type = ARPHRD_IEEE80211;
 766         mdev->netdev_ops = &ieee80211_master_ops;
 767         mdev->header_ops = &ieee80211_header_ops;
 768         mdev->tx_queue_len = 1000;
 769         mdev->addr_len = ETH_ALEN;
 770 }
 771
 772 int ieee80211_register_hw(struct ieee80211_hw *hw)
 773 {
 774         struct ieee80211_local *local = hw_to_local(hw);
 775         int result;
 776         enum ieee80211_band band;
 777         struct net_device *mdev;
 778         struct ieee80211_master_priv *mpriv;
 779         int channels, i, j, max_bitrates;
 780         bool supp_ht;
 781         static const u32 cipher_suites[] = {
 782                 WLAN_CIPHER_SUITE_WEP40,
 783                 WLAN_CIPHER_SUITE_WEP104,
 784                 WLAN_CIPHER_SUITE_TKIP,
 785                 WLAN_CIPHER_SUITE_CCMP,
 786
 787                 /* keep last -- depends on hw flags! */
 788                 WLAN_CIPHER_SUITE_AES_CMAC
 789         };
 790
 791         /*
 792          * generic code guarantees at least one band,
 793          * set this very early because much code assumes
 794          * that hw.conf.channel is assigned
 795          */
 796         channels = 0;
 797         max_bitrates = 0;
 798         supp_ht = false;
 799         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 800                 struct ieee80211_supported_band *sband;
 801
 802                 sband = local->hw.wiphy->bands[band];
 803                 if (!sband)
 804                         continue;
 805                 if (!local->oper_channel) {
 806                         /* init channel we're on */
 807                         local->hw.conf.channel =
 808                         local->oper_channel = &sband->channels[0];
 809                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 810                 }
 811                 channels += sband->n_channels;
 812
 813                 if (max_bitrates < sband->n_bitrates)
 814                         max_bitrates = sband->n_bitrates;
 815                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 816         }
 817
 818         local->int_scan_req.n_channels = channels;
 819         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
 820         if (!local->int_scan_req.channels)
 821                 return -ENOMEM;
 822
 823         /* if low-level driver supports AP, we also support VLAN */
 824         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 825                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 826
 827         /* mac80211 always supports monitor */
 828         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 829
 830         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 831                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 832         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 833                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 834
 835         /*
 836          * Calculate scan IE length -- we need this to alloc
 837          * memory and to subtract from the driver limit. It
 838          * includes the (extended) supported rates and HT
 839          * information -- SSID is the driver's responsibility.
 840          */
 841         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 842         if (supp_ht)
 843                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 844
 845         if (!local->ops->hw_scan) {
 846                 /* For hw_scan, driver needs to set these up. */
 847                 local->hw.wiphy->max_scan_ssids = 4;
 848                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 849         }
 850
 851         /*
 852          * If the driver supports any scan IEs, then assume the
 853          * limit includes the IEs mac80211 will add, otherwise
 854          * leave it at zero and let the driver sort it out; we
 855          * still pass our IEs to the driver but userspace will
 856          * not be allowed to in that case.
 857          */
 858         if (local->hw.wiphy->max_scan_ie_len)
 859                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 860
 861         local->hw.wiphy->cipher_suites = cipher_suites;
 862         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 863         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 864                 local->hw.wiphy->n_cipher_suites--;
 865
 866         result = wiphy_register(local->hw.wiphy);
 867         if (result < 0)
 868                 goto fail_wiphy_register;
 869
 870         /*
 871          * We use the number of queues for feature tests (QoS, HT) internally
 872          * so restrict them appropriately.
 873          */
 874         if (hw->queues > IEEE80211_MAX_QUEUES)
 875                 hw->queues = IEEE80211_MAX_QUEUES;
 876
 877         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 878                                "wmaster%d", ieee80211_master_setup,
 879                                hw->queues);
 880         if (!mdev)
 881                 goto fail_mdev_alloc;
 882
 883         mpriv = netdev_priv(mdev);
 884         mpriv->local = local;
 885         local->mdev = mdev;
 886
 887         local->hw.workqueue =
 888                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 889         if (!local->hw.workqueue) {
 890                 result = -ENOMEM;
 891                 goto fail_workqueue;
 892         }
 893
 894         /*
 895          * The hardware needs headroom for sending the frame,
 896          * and we need some headroom for passing the frame to monitor
 897          * interfaces, but never both at the same time.
 898          */
 899         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 900                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 901
 902         debugfs_hw_add(local);
 903
 904         if (local->hw.max_listen_interval == 0)
 905                 local->hw.max_listen_interval = 1;
 906
 907         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 908
 909         result = sta_info_start(local);
 910         if (result < 0)
 911                 goto fail_sta_info;
 912
 913         result = ieee80211_wep_init(local);
 914         if (result < 0) {
 915                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 916                        wiphy_name(local->hw.wiphy), result);
 917                 goto fail_wep;
 918         }
 919
 920         rtnl_lock();
 921         result = dev_alloc_name(local->mdev, local->mdev->name);
 922         if (result < 0)
 923                 goto fail_dev;
 924
 925         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 926         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 927         local->mdev->features |= NETIF_F_NETNS_LOCAL;
 928
 929         result = register_netdevice(local->mdev);
 930         if (result < 0)
 931                 goto fail_dev;
 932
 933         result = ieee80211_init_rate_ctrl_alg(local,
 934                                               hw->rate_control_algorithm);
 935         if (result < 0) {
 936                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 937                        "algorithm\n", wiphy_name(local->hw.wiphy));
 938                 goto fail_rate;
 939         }
 940
 941         /* add one default STA interface if supported */
 942         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 943                 result = ieee80211_if_add(local, "wlan%d", NULL,
 944                                           NL80211_IFTYPE_STATION, NULL);
 945                 if (result)
 946                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 947                                wiphy_name(local->hw.wiphy));
 948         }
 949
 950         rtnl_unlock();
 951
 952         ieee80211_led_init(local);
 953
 954         /* alloc internal scan request */
 955         i = 0;
 956         local->int_scan_req.ssids = &local->scan_ssid;
 957         local->int_scan_req.n_ssids = 1;
 958         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 959                 if (!hw->wiphy->bands[band])
 960                         continue;
 961                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 962                         local->int_scan_req.channels[i] =
 963                                 &hw->wiphy->bands[band]->channels[j];
 964                         i++;
 965                 }
 966         }
 967
 968         local->network_latency_notifier.notifier_call =
 969                 ieee80211_max_network_latency;
 970         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 971                                      &local->network_latency_notifier);
 972
 973         if (result) {
 974                 rtnl_lock();
 975                 goto fail_pm_qos;
 976         }
 977
 978         return 0;
 979
 980  fail_pm_qos:
 981         ieee80211_led_exit(local);
 982         ieee80211_remove_interfaces(local);
 983  fail_rate:
 984         unregister_netdevice(local->mdev);
 985         local->mdev = NULL;
 986  fail_dev:
 987         rtnl_unlock();
 988         ieee80211_wep_free(local);
 989  fail_wep:
 990         sta_info_stop(local);
 991  fail_sta_info:
 992         debugfs_hw_del(local);
 993         destroy_workqueue(local->hw.workqueue);
 994  fail_workqueue:
 995         if (local->mdev)
 996                 free_netdev(local->mdev);
 997  fail_mdev_alloc:
 998         wiphy_unregister(local->hw.wiphy);
 999  fail_wiphy_register:
1000         kfree(local->int_scan_req.channels);
1001         return result;
1002 }
1003 EXPORT_SYMBOL(ieee80211_register_hw);
1004
1005 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1006 {
1007         struct ieee80211_local *local = hw_to_local(hw);
1008
1009         tasklet_kill(&local->tx_pending_tasklet);
1010         tasklet_kill(&local->tasklet);
1011
1012         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1013                                &local->network_latency_notifier);
1014
1015         rtnl_lock();
1016
1017         /*
1018          * At this point, interface list manipulations are fine
1019          * because the driver cannot be handing us frames any
1020          * more and the tasklet is killed.
1021          */
1022
1023         /* First, we remove all virtual interfaces. */
1024         ieee80211_remove_interfaces(local);
1025
1026         /* then, finally, remove the master interface */
1027         unregister_netdevice(local->mdev);
1028
1029         rtnl_unlock();
1030
1031         ieee80211_clear_tx_pending(local);
1032         sta_info_stop(local);
1033         rate_control_deinitialize(local);
1034         debugfs_hw_del(local);
1035
1036         if (skb_queue_len(&local->skb_queue)
1037                         || skb_queue_len(&local->skb_queue_unreliable))
1038                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1039                        wiphy_name(local->hw.wiphy));
1040         skb_queue_purge(&local->skb_queue);
1041         skb_queue_purge(&local->skb_queue_unreliable);
1042
1043         destroy_workqueue(local->hw.workqueue);
1044         wiphy_unregister(local->hw.wiphy);
1045         ieee80211_wep_free(local);
1046         ieee80211_led_exit(local);
1047         free_netdev(local->mdev);
1048         kfree(local->int_scan_req.channels);
1049 }
1050 EXPORT_SYMBOL(ieee80211_unregister_hw);
1051
1052 void ieee80211_free_hw(struct ieee80211_hw *hw)
1053 {
1054         struct ieee80211_local *local = hw_to_local(hw);
1055
1056         mutex_destroy(&local->iflist_mtx);
1057         mutex_destroy(&local->scan_mtx);
1058
1059         wiphy_free(local->hw.wiphy);
1060 }
1061 EXPORT_SYMBOL(ieee80211_free_hw);
1062
1063 static int __init ieee80211_init(void)
1064 {
1065         struct sk_buff *skb;
1066         int ret;
1067
1068         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1069         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1070                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1071
1072         ret = rc80211_minstrel_init();
1073         if (ret)
1074                 return ret;
1075
1076         ret = rc80211_pid_init();
1077         if (ret)
1078                 return ret;
1079
1080         ieee80211_debugfs_netdev_init();
1081
1082         return 0;
1083 }
1084
1085 static void __exit ieee80211_exit(void)
1086 {
1087         rc80211_pid_exit();
1088         rc80211_minstrel_exit();
1089
1090         /*
1091          * For key todo, it'll be empty by now but the work
1092          * might still be scheduled.
1093          */
1094         flush_scheduled_work();
1095
1096         if (mesh_allocated)
1097                 ieee80211s_stop();
1098
1099         ieee80211_debugfs_netdev_exit();
1100 }
1101
1102
1103 subsys_initcall(ieee80211_init);
1104 module_exit(ieee80211_exit);
1105
1106 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1107 MODULE_LICENSE("GPL");