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 void ieee80211_configure_filter(struct ieee80211_local *local)
  54 {
  55         u64 mc;
  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 || local->scanning)
  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         if (local->fif_pspoll)
  81                 new_flags |= FIF_PSPOLL;
  82
  83         spin_lock_bh(&local->filter_lock);
  84         changed_flags = local->filter_flags ^ new_flags;
  85
  86         mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
  87         spin_unlock_bh(&local->filter_lock);
  88
  89         /* be a bit nasty */
  90         new_flags |= (1<<31);
  91
  92         drv_configure_filter(local, changed_flags, &new_flags, mc);
  93
  94         WARN_ON(new_flags & (1<<31));
  95
  96         local->filter_flags = new_flags & ~(1<<31);
  97 }
  98
  99 static void ieee80211_reconfig_filter(struct work_struct *work)
 100 {
 101         struct ieee80211_local *local =
 102                 container_of(work, struct ieee80211_local, reconfig_filter);
 103
 104         ieee80211_configure_filter(local);
 105 }
 106
 107 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 108 {
 109         struct ieee80211_channel *chan, *scan_chan;
 110         int ret = 0;
 111         int power;
 112         enum nl80211_channel_type channel_type;
 113
 114         might_sleep();
 115
 116         scan_chan = local->scan_channel;
 117
 118         if (scan_chan) {
 119                 chan = scan_chan;
 120                 channel_type = NL80211_CHAN_NO_HT;
 121         } else {
 122                 chan = local->oper_channel;
 123                 channel_type = local->oper_channel_type;
 124         }
 125
 126         if (chan != local->hw.conf.channel ||
 127             channel_type != local->hw.conf.channel_type) {
 128                 local->hw.conf.channel = chan;
 129                 local->hw.conf.channel_type = channel_type;
 130                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 131         }
 132
 133         if (scan_chan)
 134                 power = chan->max_power;
 135         else
 136                 power = local->power_constr_level ?
 137                         (chan->max_power - local->power_constr_level) :
 138                         chan->max_power;
 139
 140         if (local->user_power_level >= 0)
 141                 power = min(power, local->user_power_level);
 142
 143         if (local->hw.conf.power_level != power) {
 144                 changed |= IEEE80211_CONF_CHANGE_POWER;
 145                 local->hw.conf.power_level = power;
 146         }
 147
 148         if (changed && local->open_count) {
 149                 ret = drv_config(local, changed);
 150                 /*
 151                  * Goal:
 152                  * HW reconfiguration should never fail, the driver has told
 153                  * us what it can support so it should live up to that promise.
 154                  *
 155                  * Current status:
 156                  * rfkill is not integrated with mac80211 and a
 157                  * configuration command can thus fail if hardware rfkill
 158                  * is enabled
 159                  *
 160                  * FIXME: integrate rfkill with mac80211 and then add this
 161                  * WARN_ON() back
 162                  *
 163                  */
 164                 /* WARN_ON(ret); */
 165         }
 166
 167         return ret;
 168 }
 169
 170 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 171                                       u32 changed)
 172 {
 173         struct ieee80211_local *local = sdata->local;
 174         static const u8 zero[ETH_ALEN] = { 0 };
 175
 176         if (!changed)
 177                 return;
 178
 179         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 180                 /*
 181                  * While not associated, claim a BSSID of all-zeroes
 182                  * so that drivers don't do any weird things with the
 183                  * BSSID at that time.
 184                  */
 185                 if (sdata->vif.bss_conf.assoc)
 186                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 187                 else
 188                         sdata->vif.bss_conf.bssid = zero;
 189         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 190                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 191         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 192                 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
 193         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 194                 sdata->vif.bss_conf.bssid = zero;
 195         } else {
 196                 WARN_ON(1);
 197                 return;
 198         }
 199
 200         switch (sdata->vif.type) {
 201         case NL80211_IFTYPE_AP:
 202         case NL80211_IFTYPE_ADHOC:
 203         case NL80211_IFTYPE_MESH_POINT:
 204                 break;
 205         default:
 206                 /* do not warn to simplify caller in scan.c */
 207                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 208                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 209                         return;
 210                 break;
 211         }
 212
 213         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 214                 if (local->quiescing || !netif_running(sdata->dev) ||
 215                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 216                         sdata->vif.bss_conf.enable_beacon = false;
 217                 } else {
 218                         /*
 219                          * Beacon should be enabled, but AP mode must
 220                          * check whether there is a beacon configured.
 221                          */
 222                         switch (sdata->vif.type) {
 223                         case NL80211_IFTYPE_AP:
 224                                 sdata->vif.bss_conf.enable_beacon =
 225                                         !!rcu_dereference(sdata->u.ap.beacon);
 226                                 break;
 227                         case NL80211_IFTYPE_ADHOC:
 228                                 sdata->vif.bss_conf.enable_beacon =
 229                                         !!rcu_dereference(sdata->u.ibss.presp);
 230                                 break;
 231                         case NL80211_IFTYPE_MESH_POINT:
 232                                 sdata->vif.bss_conf.enable_beacon = true;
 233                                 break;
 234                         default:
 235                                 /* not reached */
 236                                 WARN_ON(1);
 237                                 break;
 238                         }
 239                 }
 240         }
 241
 242         drv_bss_info_changed(local, &sdata->vif,
 243                              &sdata->vif.bss_conf, changed);
 244
 245         /* DEPRECATED */
 246         local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
 247 }
 248
 249 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 250 {
 251         sdata->vif.bss_conf.use_cts_prot = false;
 252         sdata->vif.bss_conf.use_short_preamble = false;
 253         sdata->vif.bss_conf.use_short_slot = false;
 254         return BSS_CHANGED_ERP_CTS_PROT |
 255                BSS_CHANGED_ERP_PREAMBLE |
 256                BSS_CHANGED_ERP_SLOT;
 257 }
 258
 259 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 260                                  struct sk_buff *skb)
 261 {
 262         struct ieee80211_local *local = hw_to_local(hw);
 263         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 264         int tmp;
 265
 266         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 267         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 268                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 269         tmp = skb_queue_len(&local->skb_queue) +
 270                 skb_queue_len(&local->skb_queue_unreliable);
 271         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 272                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 273                 dev_kfree_skb_irq(skb);
 274                 tmp--;
 275                 I802_DEBUG_INC(local->tx_status_drop);
 276         }
 277         tasklet_schedule(&local->tasklet);
 278 }
 279 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 280
 281 static void ieee80211_tasklet_handler(unsigned long data)
 282 {
 283         struct ieee80211_local *local = (struct ieee80211_local *) data;
 284         struct sk_buff *skb;
 285         struct ieee80211_ra_tid *ra_tid;
 286
 287         while ((skb = skb_dequeue(&local->skb_queue)) ||
 288                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 289                 switch (skb->pkt_type) {
 290                 case IEEE80211_RX_MSG:
 291                         /* Clear skb->pkt_type in order to not confuse kernel
 292                          * netstack. */
 293                         skb->pkt_type = 0;
 294                         ieee80211_rx(local_to_hw(local), skb);
 295                         break;
 296                 case IEEE80211_TX_STATUS_MSG:
 297                         skb->pkt_type = 0;
 298                         ieee80211_tx_status(local_to_hw(local), skb);
 299                         break;
 300                 case IEEE80211_DELBA_MSG:
 301                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 302                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 303                                                 ra_tid->ra, ra_tid->tid);
 304                         dev_kfree_skb(skb);
 305                         break;
 306                 case IEEE80211_ADDBA_MSG:
 307                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 308                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 309                                                  ra_tid->ra, ra_tid->tid);
 310                         dev_kfree_skb(skb);
 311                         break ;
 312                 default:
 313                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 314                              skb->pkt_type);
 315                         dev_kfree_skb(skb);
 316                         break;
 317                 }
 318         }
 319 }
 320
 321 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 322                                             struct sta_info *sta,
 323                                             struct sk_buff *skb)
 324 {
 325         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 326
 327         /*
 328          * XXX: This is temporary!
 329          *
 330          *      The problem here is that when we get here, the driver will
 331          *      quite likely have pretty much overwritten info->control by
 332          *      using info->driver_data or info->rate_driver_data. Thus,
 333          *      when passing out the frame to the driver again, we would be
 334          *      passing completely bogus data since the driver would then
 335          *      expect a properly filled info->control. In mac80211 itself
 336          *      the same problem occurs, since we need info->control.vif
 337          *      internally.
 338          *
 339          *      To fix this, we should send the frame through TX processing
 340          *      again. However, it's not that simple, since the frame will
 341          *      have been software-encrypted (if applicable) already, and
 342          *      encrypting it again doesn't do much good. So to properly do
 343          *      that, we not only have to skip the actual 'raw' encryption
 344          *      (key selection etc. still has to be done!) but also the
 345          *      sequence number assignment since that impacts the crypto
 346          *      encapsulation, of course.
 347          *
 348          *      Hence, for now, fix the bug by just dropping the frame.
 349          */
 350         goto drop;
 351
 352         sta->tx_filtered_count++;
 353
 354         /*
 355          * Clear the TX filter mask for this STA when sending the next
 356          * packet. If the STA went to power save mode, this will happen
 357          * when it wakes up for the next time.
 358          */
 359         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 360
 361         /*
 362          * This code races in the following way:
 363          *
 364          *  (1) STA sends frame indicating it will go to sleep and does so
 365          *  (2) hardware/firmware adds STA to filter list, passes frame up
 366          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 367          *  (4) we get TX status before having processed the frame and
 368          *      knowing that the STA has gone to sleep.
 369          *
 370          * This is actually quite unlikely even when both those events are
 371          * processed from interrupts coming in quickly after one another or
 372          * even at the same time because we queue both TX status events and
 373          * RX frames to be processed by a tasklet and process them in the
 374          * same order that they were received or TX status last. Hence, there
 375          * is no race as long as the frame RX is processed before the next TX
 376          * status, which drivers can ensure, see below.
 377          *
 378          * Note that this can only happen if the hardware or firmware can
 379          * actually add STAs to the filter list, if this is done by the
 380          * driver in response to set_tim() (which will only reduce the race
 381          * this whole filtering tries to solve, not completely solve it)
 382          * this situation cannot happen.
 383          *
 384          * To completely solve this race drivers need to make sure that they
 385          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 386          *      functions and
 387          *  (b) always process RX events before TX status events if ordering
 388          *      can be unknown, for example with different interrupt status
 389          *      bits.
 390          */
 391         if (test_sta_flags(sta, WLAN_STA_PS) &&
 392             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 393                 skb_queue_tail(&sta->tx_filtered, skb);
 394                 return;
 395         }
 396
 397         if (!test_sta_flags(sta, WLAN_STA_PS) &&
 398             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 399                 /* Software retry the packet once */
 400                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
 401                 ieee80211_add_pending_skb(local, skb);
 402                 return;
 403         }
 404
 405  drop:
 406 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 407         if (net_ratelimit())
 408                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 409                        "queue_len=%d PS=%d @%lu\n",
 410                        wiphy_name(local->hw.wiphy),
 411                        skb_queue_len(&sta->tx_filtered),
 412                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 413 #endif
 414         dev_kfree_skb(skb);
 415 }
 416
 417 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 418 {
 419         struct sk_buff *skb2;
 420         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 421         struct ieee80211_local *local = hw_to_local(hw);
 422         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 423         u16 frag, type;
 424         __le16 fc;
 425         struct ieee80211_supported_band *sband;
 426         struct ieee80211_tx_status_rtap_hdr *rthdr;
 427         struct ieee80211_sub_if_data *sdata;
 428         struct net_device *prev_dev = NULL;
 429         struct sta_info *sta;
 430         int retry_count = -1, i;
 431
 432         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 433                 /* the HW cannot have attempted that rate */
 434                 if (i >= hw->max_rates) {
 435                         info->status.rates[i].idx = -1;
 436                         info->status.rates[i].count = 0;
 437                 }
 438
 439                 retry_count += info->status.rates[i].count;
 440         }
 441         if (retry_count < 0)
 442                 retry_count = 0;
 443
 444         rcu_read_lock();
 445
 446         sband = local->hw.wiphy->bands[info->band];
 447
 448         sta = sta_info_get(local, hdr->addr1);
 449
 450         if (sta) {
 451                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 452                     test_sta_flags(sta, WLAN_STA_PS)) {
 453                         /*
 454                          * The STA is in power save mode, so assume
 455                          * that this TX packet failed because of that.
 456                          */
 457                         ieee80211_handle_filtered_frame(local, sta, skb);
 458                         rcu_read_unlock();
 459                         return;
 460                 }
 461
 462                 fc = hdr->frame_control;
 463
 464                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 465                     (ieee80211_is_data_qos(fc))) {
 466                         u16 tid, ssn;
 467                         u8 *qc;
 468
 469                         qc = ieee80211_get_qos_ctl(hdr);
 470                         tid = qc[0] & 0xf;
 471                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 472                                                 & IEEE80211_SCTL_SEQ);
 473                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 474                                            tid, ssn);
 475                 }
 476
 477                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 478                         ieee80211_handle_filtered_frame(local, sta, skb);
 479                         rcu_read_unlock();
 480                         return;
 481                 } else {
 482                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 483                                 sta->tx_retry_failed++;
 484                         sta->tx_retry_count += retry_count;
 485                 }
 486
 487                 rate_control_tx_status(local, sband, sta, skb);
 488         }
 489
 490         rcu_read_unlock();
 491
 492         ieee80211_led_tx(local, 0);
 493
 494         /* SNMP counters
 495          * Fragments are passed to low-level drivers as separate skbs, so these
 496          * are actually fragments, not frames. Update frame counters only for
 497          * the first fragment of the frame. */
 498
 499         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 500         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 501
 502         if (info->flags & IEEE80211_TX_STAT_ACK) {
 503                 if (frag == 0) {
 504                         local->dot11TransmittedFrameCount++;
 505                         if (is_multicast_ether_addr(hdr->addr1))
 506                                 local->dot11MulticastTransmittedFrameCount++;
 507                         if (retry_count > 0)
 508                                 local->dot11RetryCount++;
 509                         if (retry_count > 1)
 510                                 local->dot11MultipleRetryCount++;
 511                 }
 512
 513                 /* This counter shall be incremented for an acknowledged MPDU
 514                  * with an individual address in the address 1 field or an MPDU
 515                  * with a multicast address in the address 1 field of type Data
 516                  * or Management. */
 517                 if (!is_multicast_ether_addr(hdr->addr1) ||
 518                     type == IEEE80211_FTYPE_DATA ||
 519                     type == IEEE80211_FTYPE_MGMT)
 520                         local->dot11TransmittedFragmentCount++;
 521         } else {
 522                 if (frag == 0)
 523                         local->dot11FailedCount++;
 524         }
 525
 526         /* this was a transmitted frame, but now we want to reuse it */
 527         skb_orphan(skb);
 528
 529         /*
 530          * This is a bit racy but we can avoid a lot of work
 531          * with this test...
 532          */
 533         if (!local->monitors && !local->cooked_mntrs) {
 534                 dev_kfree_skb(skb);
 535                 return;
 536         }
 537
 538         /* send frame to monitor interfaces now */
 539
 540         if (skb_headroom(skb) < sizeof(*rthdr)) {
 541                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 542                 dev_kfree_skb(skb);
 543                 return;
 544         }
 545
 546         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 547                                 skb_push(skb, sizeof(*rthdr));
 548
 549         memset(rthdr, 0, sizeof(*rthdr));
 550         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 551         rthdr->hdr.it_present =
 552                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 553                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 554                             (1 << IEEE80211_RADIOTAP_RATE));
 555
 556         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 557             !is_multicast_ether_addr(hdr->addr1))
 558                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 559
 560         /*
 561          * XXX: Once radiotap gets the bitmap reset thing the vendor
 562          *      extensions proposal contains, we can actually report
 563          *      the whole set of tries we did.
 564          */
 565         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 566             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 567                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 568         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 569                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 570         if (info->status.rates[0].idx >= 0 &&
 571             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 572                 rthdr->rate = sband->bitrates[
 573                                 info->status.rates[0].idx].bitrate / 5;
 574
 575         /* for now report the total retry_count */
 576         rthdr->data_retries = retry_count;
 577
 578         /* XXX: is this sufficient for BPF? */
 579         skb_set_mac_header(skb, 0);
 580         skb->ip_summed = CHECKSUM_UNNECESSARY;
 581         skb->pkt_type = PACKET_OTHERHOST;
 582         skb->protocol = htons(ETH_P_802_2);
 583         memset(skb->cb, 0, sizeof(skb->cb));
 584
 585         rcu_read_lock();
 586         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 587                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 588                         if (!netif_running(sdata->dev))
 589                                 continue;
 590
 591                         if (prev_dev) {
 592                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 593                                 if (skb2) {
 594                                         skb2->dev = prev_dev;
 595                                         netif_rx(skb2);
 596                                 }
 597                         }
 598
 599                         prev_dev = sdata->dev;
 600                 }
 601         }
 602         if (prev_dev) {
 603                 skb->dev = prev_dev;
 604                 netif_rx(skb);
 605                 skb = NULL;
 606         }
 607         rcu_read_unlock();
 608         dev_kfree_skb(skb);
 609 }
 610 EXPORT_SYMBOL(ieee80211_tx_status);
 611
 612 static void ieee80211_restart_work(struct work_struct *work)
 613 {
 614         struct ieee80211_local *local =
 615                 container_of(work, struct ieee80211_local, restart_work);
 616
 617         rtnl_lock();
 618         ieee80211_reconfig(local);
 619         rtnl_unlock();
 620 }
 621
 622 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 623 {
 624         struct ieee80211_local *local = hw_to_local(hw);
 625
 626         /* use this reason, __ieee80211_resume will unblock it */
 627         ieee80211_stop_queues_by_reason(hw,
 628                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 629
 630         schedule_work(&local->restart_work);
 631 }
 632 EXPORT_SYMBOL(ieee80211_restart_hw);
 633
 634 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 635                                         const struct ieee80211_ops *ops)
 636 {
 637         struct ieee80211_local *local;
 638         int priv_size, i;
 639         struct wiphy *wiphy;
 640
 641         /* Ensure 32-byte alignment of our private data and hw private data.
 642          * We use the wiphy priv data for both our ieee80211_local and for
 643          * the driver's private data
 644          *
 645          * In memory it'll be like this:
 646          *
 647          * +-------------------------+
 648          * | struct wiphy           |
 649          * +-------------------------+
 650          * | struct ieee80211_local  |
 651          * +-------------------------+
 652          * | driver's private data   |
 653          * +-------------------------+
 654          *
 655          */
 656         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 657
 658         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 659
 660         if (!wiphy)
 661                 return NULL;
 662
 663         wiphy->netnsok = true;
 664         wiphy->privid = mac80211_wiphy_privid;
 665
 666         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 667         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 668                                sizeof(struct cfg80211_bss);
 669
 670         local = wiphy_priv(wiphy);
 671
 672         local->hw.wiphy = wiphy;
 673
 674         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 675
 676         BUG_ON(!ops->tx);
 677         BUG_ON(!ops->start);
 678         BUG_ON(!ops->stop);
 679         BUG_ON(!ops->config);
 680         BUG_ON(!ops->add_interface);
 681         BUG_ON(!ops->remove_interface);
 682         BUG_ON(!ops->configure_filter);
 683         local->ops = ops;
 684
 685         /* set up some defaults */
 686         local->hw.queues = 1;
 687         local->hw.max_rates = 1;
 688         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 689         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 690         local->hw.conf.radio_enabled = true;
 691         local->user_power_level = -1;
 692
 693         INIT_LIST_HEAD(&local->interfaces);
 694         mutex_init(&local->iflist_mtx);
 695         mutex_init(&local->scan_mtx);
 696
 697         spin_lock_init(&local->key_lock);
 698         spin_lock_init(&local->filter_lock);
 699         spin_lock_init(&local->queue_stop_reason_lock);
 700
 701         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 702
 703         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 704
 705         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 706
 707         INIT_WORK(&local->dynamic_ps_enable_work,
 708                   ieee80211_dynamic_ps_enable_work);
 709         INIT_WORK(&local->dynamic_ps_disable_work,
 710                   ieee80211_dynamic_ps_disable_work);
 711         setup_timer(&local->dynamic_ps_timer,
 712                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 713
 714         sta_info_init(local);
 715
 716         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 717                 skb_queue_head_init(&local->pending[i]);
 718         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 719                      (unsigned long)local);
 720         tasklet_disable(&local->tx_pending_tasklet);
 721
 722         tasklet_init(&local->tasklet,
 723                      ieee80211_tasklet_handler,
 724                      (unsigned long) local);
 725         tasklet_disable(&local->tasklet);
 726
 727         skb_queue_head_init(&local->skb_queue);
 728         skb_queue_head_init(&local->skb_queue_unreliable);
 729
 730         spin_lock_init(&local->ampdu_lock);
 731
 732         return local_to_hw(local);
 733 }
 734 EXPORT_SYMBOL(ieee80211_alloc_hw);
 735
 736 int ieee80211_register_hw(struct ieee80211_hw *hw)
 737 {
 738         struct ieee80211_local *local = hw_to_local(hw);
 739         int result;
 740         enum ieee80211_band band;
 741         int channels, i, j, max_bitrates;
 742         bool supp_ht;
 743         static const u32 cipher_suites[] = {
 744                 WLAN_CIPHER_SUITE_WEP40,
 745                 WLAN_CIPHER_SUITE_WEP104,
 746                 WLAN_CIPHER_SUITE_TKIP,
 747                 WLAN_CIPHER_SUITE_CCMP,
 748
 749                 /* keep last -- depends on hw flags! */
 750                 WLAN_CIPHER_SUITE_AES_CMAC
 751         };
 752
 753         /*
 754          * generic code guarantees at least one band,
 755          * set this very early because much code assumes
 756          * that hw.conf.channel is assigned
 757          */
 758         channels = 0;
 759         max_bitrates = 0;
 760         supp_ht = false;
 761         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 762                 struct ieee80211_supported_band *sband;
 763
 764                 sband = local->hw.wiphy->bands[band];
 765                 if (!sband)
 766                         continue;
 767                 if (!local->oper_channel) {
 768                         /* init channel we're on */
 769                         local->hw.conf.channel =
 770                         local->oper_channel = &sband->channels[0];
 771                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 772                 }
 773                 channels += sband->n_channels;
 774
 775                 if (max_bitrates < sband->n_bitrates)
 776                         max_bitrates = sband->n_bitrates;
 777                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 778         }
 779
 780         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 781                                       sizeof(void *) * channels, GFP_KERNEL);
 782         if (!local->int_scan_req)
 783                 return -ENOMEM;
 784
 785         /* if low-level driver supports AP, we also support VLAN */
 786         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 787                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 788
 789         /* mac80211 always supports monitor */
 790         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 791
 792         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 793                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 794         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 795                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 796
 797         /*
 798          * Calculate scan IE length -- we need this to alloc
 799          * memory and to subtract from the driver limit. It
 800          * includes the (extended) supported rates and HT
 801          * information -- SSID is the driver's responsibility.
 802          */
 803         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 804         if (supp_ht)
 805                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 806
 807         if (!local->ops->hw_scan) {
 808                 /* For hw_scan, driver needs to set these up. */
 809                 local->hw.wiphy->max_scan_ssids = 4;
 810                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 811         }
 812
 813         /*
 814          * If the driver supports any scan IEs, then assume the
 815          * limit includes the IEs mac80211 will add, otherwise
 816          * leave it at zero and let the driver sort it out; we
 817          * still pass our IEs to the driver but userspace will
 818          * not be allowed to in that case.
 819          */
 820         if (local->hw.wiphy->max_scan_ie_len)
 821                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 822
 823         local->hw.wiphy->cipher_suites = cipher_suites;
 824         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 825         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 826                 local->hw.wiphy->n_cipher_suites--;
 827
 828         result = wiphy_register(local->hw.wiphy);
 829         if (result < 0)
 830                 goto fail_wiphy_register;
 831
 832         /*
 833          * We use the number of queues for feature tests (QoS, HT) internally
 834          * so restrict them appropriately.
 835          */
 836         if (hw->queues > IEEE80211_MAX_QUEUES)
 837                 hw->queues = IEEE80211_MAX_QUEUES;
 838
 839         local->workqueue =
 840                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 841         if (!local->workqueue) {
 842                 result = -ENOMEM;
 843                 goto fail_workqueue;
 844         }
 845
 846         /*
 847          * The hardware needs headroom for sending the frame,
 848          * and we need some headroom for passing the frame to monitor
 849          * interfaces, but never both at the same time.
 850          */
 851         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 852                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 853
 854         debugfs_hw_add(local);
 855
 856         if (local->hw.max_listen_interval == 0)
 857                 local->hw.max_listen_interval = 1;
 858
 859         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 860
 861         result = sta_info_start(local);
 862         if (result < 0)
 863                 goto fail_sta_info;
 864
 865         result = ieee80211_wep_init(local);
 866         if (result < 0) {
 867                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 868                        wiphy_name(local->hw.wiphy), result);
 869                 goto fail_wep;
 870         }
 871
 872         rtnl_lock();
 873
 874         result = ieee80211_init_rate_ctrl_alg(local,
 875                                               hw->rate_control_algorithm);
 876         if (result < 0) {
 877                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 878                        "algorithm\n", wiphy_name(local->hw.wiphy));
 879                 goto fail_rate;
 880         }
 881
 882         /* add one default STA interface if supported */
 883         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 884                 result = ieee80211_if_add(local, "wlan%d", NULL,
 885                                           NL80211_IFTYPE_STATION, NULL);
 886                 if (result)
 887                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 888                                wiphy_name(local->hw.wiphy));
 889         }
 890
 891         rtnl_unlock();
 892
 893         ieee80211_led_init(local);
 894
 895         /* alloc internal scan request */
 896         i = 0;
 897         local->int_scan_req->ssids = &local->scan_ssid;
 898         local->int_scan_req->n_ssids = 1;
 899         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 900                 if (!hw->wiphy->bands[band])
 901                         continue;
 902                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 903                         local->int_scan_req->channels[i] =
 904                                 &hw->wiphy->bands[band]->channels[j];
 905                         i++;
 906                 }
 907         }
 908
 909         local->network_latency_notifier.notifier_call =
 910                 ieee80211_max_network_latency;
 911         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 912                                      &local->network_latency_notifier);
 913
 914         if (result) {
 915                 rtnl_lock();
 916                 goto fail_pm_qos;
 917         }
 918
 919         return 0;
 920
 921  fail_pm_qos:
 922         ieee80211_led_exit(local);
 923         ieee80211_remove_interfaces(local);
 924  fail_rate:
 925         rtnl_unlock();
 926         ieee80211_wep_free(local);
 927  fail_wep:
 928         sta_info_stop(local);
 929  fail_sta_info:
 930         debugfs_hw_del(local);
 931         destroy_workqueue(local->workqueue);
 932  fail_workqueue:
 933         wiphy_unregister(local->hw.wiphy);
 934  fail_wiphy_register:
 935         kfree(local->int_scan_req->channels);
 936         return result;
 937 }
 938 EXPORT_SYMBOL(ieee80211_register_hw);
 939
 940 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 941 {
 942         struct ieee80211_local *local = hw_to_local(hw);
 943
 944         tasklet_kill(&local->tx_pending_tasklet);
 945         tasklet_kill(&local->tasklet);
 946
 947         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 948                                &local->network_latency_notifier);
 949
 950         rtnl_lock();
 951
 952         /*
 953          * At this point, interface list manipulations are fine
 954          * because the driver cannot be handing us frames any
 955          * more and the tasklet is killed.
 956          */
 957         ieee80211_remove_interfaces(local);
 958
 959         rtnl_unlock();
 960
 961         cancel_work_sync(&local->reconfig_filter);
 962
 963         ieee80211_clear_tx_pending(local);
 964         sta_info_stop(local);
 965         rate_control_deinitialize(local);
 966         debugfs_hw_del(local);
 967
 968         if (skb_queue_len(&local->skb_queue)
 969                         || skb_queue_len(&local->skb_queue_unreliable))
 970                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 971                        wiphy_name(local->hw.wiphy));
 972         skb_queue_purge(&local->skb_queue);
 973         skb_queue_purge(&local->skb_queue_unreliable);
 974
 975         destroy_workqueue(local->workqueue);
 976         wiphy_unregister(local->hw.wiphy);
 977         ieee80211_wep_free(local);
 978         ieee80211_led_exit(local);
 979         kfree(local->int_scan_req);
 980 }
 981 EXPORT_SYMBOL(ieee80211_unregister_hw);
 982
 983 void ieee80211_free_hw(struct ieee80211_hw *hw)
 984 {
 985         struct ieee80211_local *local = hw_to_local(hw);
 986
 987         mutex_destroy(&local->iflist_mtx);
 988         mutex_destroy(&local->scan_mtx);
 989
 990         wiphy_free(local->hw.wiphy);
 991 }
 992 EXPORT_SYMBOL(ieee80211_free_hw);
 993
 994 static int __init ieee80211_init(void)
 995 {
 996         struct sk_buff *skb;
 997         int ret;
 998
 999         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1000         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1001                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1002
1003         ret = rc80211_minstrel_init();
1004         if (ret)
1005                 return ret;
1006
1007         ret = rc80211_pid_init();
1008         if (ret)
1009                 return ret;
1010
1011         ieee80211_debugfs_netdev_init();
1012
1013         return 0;
1014 }
1015
1016 static void __exit ieee80211_exit(void)
1017 {
1018         rc80211_pid_exit();
1019         rc80211_minstrel_exit();
1020
1021         /*
1022          * For key todo, it'll be empty by now but the work
1023          * might still be scheduled.
1024          */
1025         flush_scheduled_work();
1026
1027         if (mesh_allocated)
1028                 ieee80211s_stop();
1029
1030         ieee80211_debugfs_netdev_exit();
1031 }
1032
1033
1034 subsys_initcall(ieee80211_init);
1035 module_exit(ieee80211_exit);
1036
1037 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1038 MODULE_LICENSE("GPL");