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
 246 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 247 {
 248         sdata->vif.bss_conf.use_cts_prot = false;
 249         sdata->vif.bss_conf.use_short_preamble = false;
 250         sdata->vif.bss_conf.use_short_slot = false;
 251         return BSS_CHANGED_ERP_CTS_PROT |
 252                BSS_CHANGED_ERP_PREAMBLE |
 253                BSS_CHANGED_ERP_SLOT;
 254 }
 255
 256 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 257                                  struct sk_buff *skb)
 258 {
 259         struct ieee80211_local *local = hw_to_local(hw);
 260         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 261         int tmp;
 262
 263         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 264         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 265                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 266         tmp = skb_queue_len(&local->skb_queue) +
 267                 skb_queue_len(&local->skb_queue_unreliable);
 268         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 269                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 270                 dev_kfree_skb_irq(skb);
 271                 tmp--;
 272                 I802_DEBUG_INC(local->tx_status_drop);
 273         }
 274         tasklet_schedule(&local->tasklet);
 275 }
 276 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 277
 278 static void ieee80211_tasklet_handler(unsigned long data)
 279 {
 280         struct ieee80211_local *local = (struct ieee80211_local *) data;
 281         struct sk_buff *skb;
 282         struct ieee80211_ra_tid *ra_tid;
 283
 284         while ((skb = skb_dequeue(&local->skb_queue)) ||
 285                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 286                 switch (skb->pkt_type) {
 287                 case IEEE80211_RX_MSG:
 288                         /* Clear skb->pkt_type in order to not confuse kernel
 289                          * netstack. */
 290                         skb->pkt_type = 0;
 291                         ieee80211_rx(local_to_hw(local), skb);
 292                         break;
 293                 case IEEE80211_TX_STATUS_MSG:
 294                         skb->pkt_type = 0;
 295                         ieee80211_tx_status(local_to_hw(local), skb);
 296                         break;
 297                 case IEEE80211_DELBA_MSG:
 298                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 299                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 300                                                 ra_tid->ra, ra_tid->tid);
 301                         dev_kfree_skb(skb);
 302                         break;
 303                 case IEEE80211_ADDBA_MSG:
 304                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 305                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 306                                                  ra_tid->ra, ra_tid->tid);
 307                         dev_kfree_skb(skb);
 308                         break ;
 309                 default:
 310                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 311                              skb->pkt_type);
 312                         dev_kfree_skb(skb);
 313                         break;
 314                 }
 315         }
 316 }
 317
 318 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 319                                             struct sta_info *sta,
 320                                             struct sk_buff *skb)
 321 {
 322         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 323
 324         /*
 325          * XXX: This is temporary!
 326          *
 327          *      The problem here is that when we get here, the driver will
 328          *      quite likely have pretty much overwritten info->control by
 329          *      using info->driver_data or info->rate_driver_data. Thus,
 330          *      when passing out the frame to the driver again, we would be
 331          *      passing completely bogus data since the driver would then
 332          *      expect a properly filled info->control. In mac80211 itself
 333          *      the same problem occurs, since we need info->control.vif
 334          *      internally.
 335          *
 336          *      To fix this, we should send the frame through TX processing
 337          *      again. However, it's not that simple, since the frame will
 338          *      have been software-encrypted (if applicable) already, and
 339          *      encrypting it again doesn't do much good. So to properly do
 340          *      that, we not only have to skip the actual 'raw' encryption
 341          *      (key selection etc. still has to be done!) but also the
 342          *      sequence number assignment since that impacts the crypto
 343          *      encapsulation, of course.
 344          *
 345          *      Hence, for now, fix the bug by just dropping the frame.
 346          */
 347         goto drop;
 348
 349         sta->tx_filtered_count++;
 350
 351         /*
 352          * Clear the TX filter mask for this STA when sending the next
 353          * packet. If the STA went to power save mode, this will happen
 354          * when it wakes up for the next time.
 355          */
 356         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 357
 358         /*
 359          * This code races in the following way:
 360          *
 361          *  (1) STA sends frame indicating it will go to sleep and does so
 362          *  (2) hardware/firmware adds STA to filter list, passes frame up
 363          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 364          *  (4) we get TX status before having processed the frame and
 365          *      knowing that the STA has gone to sleep.
 366          *
 367          * This is actually quite unlikely even when both those events are
 368          * processed from interrupts coming in quickly after one another or
 369          * even at the same time because we queue both TX status events and
 370          * RX frames to be processed by a tasklet and process them in the
 371          * same order that they were received or TX status last. Hence, there
 372          * is no race as long as the frame RX is processed before the next TX
 373          * status, which drivers can ensure, see below.
 374          *
 375          * Note that this can only happen if the hardware or firmware can
 376          * actually add STAs to the filter list, if this is done by the
 377          * driver in response to set_tim() (which will only reduce the race
 378          * this whole filtering tries to solve, not completely solve it)
 379          * this situation cannot happen.
 380          *
 381          * To completely solve this race drivers need to make sure that they
 382          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 383          *      functions and
 384          *  (b) always process RX events before TX status events if ordering
 385          *      can be unknown, for example with different interrupt status
 386          *      bits.
 387          */
 388         if (test_sta_flags(sta, WLAN_STA_PS) &&
 389             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 390                 skb_queue_tail(&sta->tx_filtered, skb);
 391                 return;
 392         }
 393
 394         if (!test_sta_flags(sta, WLAN_STA_PS) &&
 395             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 396                 /* Software retry the packet once */
 397                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
 398                 ieee80211_add_pending_skb(local, skb);
 399                 return;
 400         }
 401
 402  drop:
 403 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 404         if (net_ratelimit())
 405                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 406                        "queue_len=%d PS=%d @%lu\n",
 407                        wiphy_name(local->hw.wiphy),
 408                        skb_queue_len(&sta->tx_filtered),
 409                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 410 #endif
 411         dev_kfree_skb(skb);
 412 }
 413
 414 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 415 {
 416         struct sk_buff *skb2;
 417         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 418         struct ieee80211_local *local = hw_to_local(hw);
 419         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 420         u16 frag, type;
 421         __le16 fc;
 422         struct ieee80211_supported_band *sband;
 423         struct ieee80211_tx_status_rtap_hdr *rthdr;
 424         struct ieee80211_sub_if_data *sdata;
 425         struct net_device *prev_dev = NULL;
 426         struct sta_info *sta;
 427         int retry_count = -1, i;
 428
 429         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 430                 /* the HW cannot have attempted that rate */
 431                 if (i >= hw->max_rates) {
 432                         info->status.rates[i].idx = -1;
 433                         info->status.rates[i].count = 0;
 434                 }
 435
 436                 retry_count += info->status.rates[i].count;
 437         }
 438         if (retry_count < 0)
 439                 retry_count = 0;
 440
 441         rcu_read_lock();
 442
 443         sband = local->hw.wiphy->bands[info->band];
 444         fc = hdr->frame_control;
 445
 446         sta = sta_info_get(local, hdr->addr1);
 447
 448         if (sta) {
 449                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 450                     test_sta_flags(sta, WLAN_STA_PS)) {
 451                         /*
 452                          * The STA is in power save mode, so assume
 453                          * that this TX packet failed because of that.
 454                          */
 455                         ieee80211_handle_filtered_frame(local, sta, skb);
 456                         rcu_read_unlock();
 457                         return;
 458                 }
 459
 460                 fc = hdr->frame_control;
 461
 462                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 463                     (ieee80211_is_data_qos(fc))) {
 464                         u16 tid, ssn;
 465                         u8 *qc;
 466
 467                         qc = ieee80211_get_qos_ctl(hdr);
 468                         tid = qc[0] & 0xf;
 469                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 470                                                 & IEEE80211_SCTL_SEQ);
 471                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 472                                            tid, ssn);
 473                 }
 474
 475                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 476                         ieee80211_handle_filtered_frame(local, sta, skb);
 477                         rcu_read_unlock();
 478                         return;
 479                 } else {
 480                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 481                                 sta->tx_retry_failed++;
 482                         sta->tx_retry_count += retry_count;
 483                 }
 484
 485                 rate_control_tx_status(local, sband, sta, skb);
 486                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
 487                         ieee80211s_update_metric(local, 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         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
 527             (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
 528             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
 529             local->ps_sdata && !(local->scanning)) {
 530                 if (info->flags & IEEE80211_TX_STAT_ACK) {
 531                         local->ps_sdata->u.mgd.flags |=
 532                                 IEEE80211_STA_NULLFUNC_ACKED;
 533                         ieee80211_queue_work(&local->hw,
 534                                              &local->dynamic_ps_enable_work);
 535                 } else
 536                         mod_timer(&local->dynamic_ps_timer, jiffies +
 537                                   msecs_to_jiffies(10));
 538         }
 539
 540         /* this was a transmitted frame, but now we want to reuse it */
 541         skb_orphan(skb);
 542
 543         /*
 544          * This is a bit racy but we can avoid a lot of work
 545          * with this test...
 546          */
 547         if (!local->monitors && !local->cooked_mntrs) {
 548                 dev_kfree_skb(skb);
 549                 return;
 550         }
 551
 552         /* send frame to monitor interfaces now */
 553
 554         if (skb_headroom(skb) < sizeof(*rthdr)) {
 555                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 556                 dev_kfree_skb(skb);
 557                 return;
 558         }
 559
 560         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 561                                 skb_push(skb, sizeof(*rthdr));
 562
 563         memset(rthdr, 0, sizeof(*rthdr));
 564         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 565         rthdr->hdr.it_present =
 566                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 567                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 568                             (1 << IEEE80211_RADIOTAP_RATE));
 569
 570         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 571             !is_multicast_ether_addr(hdr->addr1))
 572                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 573
 574         /*
 575          * XXX: Once radiotap gets the bitmap reset thing the vendor
 576          *      extensions proposal contains, we can actually report
 577          *      the whole set of tries we did.
 578          */
 579         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 580             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 581                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 582         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 583                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 584         if (info->status.rates[0].idx >= 0 &&
 585             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 586                 rthdr->rate = sband->bitrates[
 587                                 info->status.rates[0].idx].bitrate / 5;
 588
 589         /* for now report the total retry_count */
 590         rthdr->data_retries = retry_count;
 591
 592         /* XXX: is this sufficient for BPF? */
 593         skb_set_mac_header(skb, 0);
 594         skb->ip_summed = CHECKSUM_UNNECESSARY;
 595         skb->pkt_type = PACKET_OTHERHOST;
 596         skb->protocol = htons(ETH_P_802_2);
 597         memset(skb->cb, 0, sizeof(skb->cb));
 598
 599         rcu_read_lock();
 600         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 601                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 602                         if (!netif_running(sdata->dev))
 603                                 continue;
 604
 605                         if (prev_dev) {
 606                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 607                                 if (skb2) {
 608                                         skb2->dev = prev_dev;
 609                                         netif_rx(skb2);
 610                                 }
 611                         }
 612
 613                         prev_dev = sdata->dev;
 614                 }
 615         }
 616         if (prev_dev) {
 617                 skb->dev = prev_dev;
 618                 netif_rx(skb);
 619                 skb = NULL;
 620         }
 621         rcu_read_unlock();
 622         dev_kfree_skb(skb);
 623 }
 624 EXPORT_SYMBOL(ieee80211_tx_status);
 625
 626 static void ieee80211_restart_work(struct work_struct *work)
 627 {
 628         struct ieee80211_local *local =
 629                 container_of(work, struct ieee80211_local, restart_work);
 630
 631         rtnl_lock();
 632         ieee80211_reconfig(local);
 633         rtnl_unlock();
 634 }
 635
 636 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 637 {
 638         struct ieee80211_local *local = hw_to_local(hw);
 639
 640         /* use this reason, __ieee80211_resume will unblock it */
 641         ieee80211_stop_queues_by_reason(hw,
 642                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 643
 644         schedule_work(&local->restart_work);
 645 }
 646 EXPORT_SYMBOL(ieee80211_restart_hw);
 647
 648 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 649                                         const struct ieee80211_ops *ops)
 650 {
 651         struct ieee80211_local *local;
 652         int priv_size, i;
 653         struct wiphy *wiphy;
 654
 655         /* Ensure 32-byte alignment of our private data and hw private data.
 656          * We use the wiphy priv data for both our ieee80211_local and for
 657          * the driver's private data
 658          *
 659          * In memory it'll be like this:
 660          *
 661          * +-------------------------+
 662          * | struct wiphy           |
 663          * +-------------------------+
 664          * | struct ieee80211_local  |
 665          * +-------------------------+
 666          * | driver's private data   |
 667          * +-------------------------+
 668          *
 669          */
 670         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 671
 672         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 673
 674         if (!wiphy)
 675                 return NULL;
 676
 677         wiphy->netnsok = true;
 678         wiphy->privid = mac80211_wiphy_privid;
 679
 680         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 681         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 682                                sizeof(struct cfg80211_bss);
 683
 684         local = wiphy_priv(wiphy);
 685
 686         local->hw.wiphy = wiphy;
 687
 688         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 689
 690         BUG_ON(!ops->tx);
 691         BUG_ON(!ops->start);
 692         BUG_ON(!ops->stop);
 693         BUG_ON(!ops->config);
 694         BUG_ON(!ops->add_interface);
 695         BUG_ON(!ops->remove_interface);
 696         BUG_ON(!ops->configure_filter);
 697         local->ops = ops;
 698
 699         /* set up some defaults */
 700         local->hw.queues = 1;
 701         local->hw.max_rates = 1;
 702         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 703         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 704         local->user_power_level = -1;
 705
 706         INIT_LIST_HEAD(&local->interfaces);
 707         mutex_init(&local->iflist_mtx);
 708         mutex_init(&local->scan_mtx);
 709
 710         spin_lock_init(&local->key_lock);
 711         spin_lock_init(&local->filter_lock);
 712         spin_lock_init(&local->queue_stop_reason_lock);
 713
 714         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 715
 716         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 717
 718         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 719
 720         INIT_WORK(&local->dynamic_ps_enable_work,
 721                   ieee80211_dynamic_ps_enable_work);
 722         INIT_WORK(&local->dynamic_ps_disable_work,
 723                   ieee80211_dynamic_ps_disable_work);
 724         setup_timer(&local->dynamic_ps_timer,
 725                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 726
 727         sta_info_init(local);
 728
 729         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 730                 skb_queue_head_init(&local->pending[i]);
 731         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 732                      (unsigned long)local);
 733
 734         tasklet_init(&local->tasklet,
 735                      ieee80211_tasklet_handler,
 736                      (unsigned long) local);
 737
 738         skb_queue_head_init(&local->skb_queue);
 739         skb_queue_head_init(&local->skb_queue_unreliable);
 740
 741         spin_lock_init(&local->ampdu_lock);
 742
 743         return local_to_hw(local);
 744 }
 745 EXPORT_SYMBOL(ieee80211_alloc_hw);
 746
 747 int ieee80211_register_hw(struct ieee80211_hw *hw)
 748 {
 749         struct ieee80211_local *local = hw_to_local(hw);
 750         int result;
 751         enum ieee80211_band band;
 752         int channels, i, j, max_bitrates;
 753         bool supp_ht;
 754         static const u32 cipher_suites[] = {
 755                 WLAN_CIPHER_SUITE_WEP40,
 756                 WLAN_CIPHER_SUITE_WEP104,
 757                 WLAN_CIPHER_SUITE_TKIP,
 758                 WLAN_CIPHER_SUITE_CCMP,
 759
 760                 /* keep last -- depends on hw flags! */
 761                 WLAN_CIPHER_SUITE_AES_CMAC
 762         };
 763
 764         /*
 765          * generic code guarantees at least one band,
 766          * set this very early because much code assumes
 767          * that hw.conf.channel is assigned
 768          */
 769         channels = 0;
 770         max_bitrates = 0;
 771         supp_ht = false;
 772         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 773                 struct ieee80211_supported_band *sband;
 774
 775                 sband = local->hw.wiphy->bands[band];
 776                 if (!sband)
 777                         continue;
 778                 if (!local->oper_channel) {
 779                         /* init channel we're on */
 780                         local->hw.conf.channel =
 781                         local->oper_channel = &sband->channels[0];
 782                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 783                 }
 784                 channels += sband->n_channels;
 785
 786                 if (max_bitrates < sband->n_bitrates)
 787                         max_bitrates = sband->n_bitrates;
 788                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 789         }
 790
 791         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 792                                       sizeof(void *) * channels, GFP_KERNEL);
 793         if (!local->int_scan_req)
 794                 return -ENOMEM;
 795
 796         /* if low-level driver supports AP, we also support VLAN */
 797         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 798                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 799
 800         /* mac80211 always supports monitor */
 801         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 802
 803         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 804                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 805         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 806                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 807
 808         /*
 809          * Calculate scan IE length -- we need this to alloc
 810          * memory and to subtract from the driver limit. It
 811          * includes the (extended) supported rates and HT
 812          * information -- SSID is the driver's responsibility.
 813          */
 814         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 815         if (supp_ht)
 816                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 817
 818         if (!local->ops->hw_scan) {
 819                 /* For hw_scan, driver needs to set these up. */
 820                 local->hw.wiphy->max_scan_ssids = 4;
 821                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 822         }
 823
 824         /*
 825          * If the driver supports any scan IEs, then assume the
 826          * limit includes the IEs mac80211 will add, otherwise
 827          * leave it at zero and let the driver sort it out; we
 828          * still pass our IEs to the driver but userspace will
 829          * not be allowed to in that case.
 830          */
 831         if (local->hw.wiphy->max_scan_ie_len)
 832                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 833
 834         local->hw.wiphy->cipher_suites = cipher_suites;
 835         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 836         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 837                 local->hw.wiphy->n_cipher_suites--;
 838
 839         result = wiphy_register(local->hw.wiphy);
 840         if (result < 0)
 841                 goto fail_wiphy_register;
 842
 843         /*
 844          * We use the number of queues for feature tests (QoS, HT) internally
 845          * so restrict them appropriately.
 846          */
 847         if (hw->queues > IEEE80211_MAX_QUEUES)
 848                 hw->queues = IEEE80211_MAX_QUEUES;
 849
 850         local->workqueue =
 851                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 852         if (!local->workqueue) {
 853                 result = -ENOMEM;
 854                 goto fail_workqueue;
 855         }
 856
 857         /*
 858          * The hardware needs headroom for sending the frame,
 859          * and we need some headroom for passing the frame to monitor
 860          * interfaces, but never both at the same time.
 861          */
 862         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 863                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 864         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 865                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 866
 867         debugfs_hw_add(local);
 868
 869         if (local->hw.max_listen_interval == 0)
 870                 local->hw.max_listen_interval = 1;
 871
 872         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 873
 874         result = sta_info_start(local);
 875         if (result < 0)
 876                 goto fail_sta_info;
 877
 878         result = ieee80211_wep_init(local);
 879         if (result < 0) {
 880                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 881                        wiphy_name(local->hw.wiphy), result);
 882                 goto fail_wep;
 883         }
 884
 885         rtnl_lock();
 886
 887         result = ieee80211_init_rate_ctrl_alg(local,
 888                                               hw->rate_control_algorithm);
 889         if (result < 0) {
 890                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 891                        "algorithm\n", wiphy_name(local->hw.wiphy));
 892                 goto fail_rate;
 893         }
 894
 895         /* add one default STA interface if supported */
 896         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 897                 result = ieee80211_if_add(local, "wlan%d", NULL,
 898                                           NL80211_IFTYPE_STATION, NULL);
 899                 if (result)
 900                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 901                                wiphy_name(local->hw.wiphy));
 902         }
 903
 904         rtnl_unlock();
 905
 906         ieee80211_led_init(local);
 907
 908         /* alloc internal scan request */
 909         i = 0;
 910         local->int_scan_req->ssids = &local->scan_ssid;
 911         local->int_scan_req->n_ssids = 1;
 912         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 913                 if (!hw->wiphy->bands[band])
 914                         continue;
 915                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 916                         local->int_scan_req->channels[i] =
 917                                 &hw->wiphy->bands[band]->channels[j];
 918                         i++;
 919                 }
 920         }
 921
 922         local->network_latency_notifier.notifier_call =
 923                 ieee80211_max_network_latency;
 924         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 925                                      &local->network_latency_notifier);
 926
 927         if (result) {
 928                 rtnl_lock();
 929                 goto fail_pm_qos;
 930         }
 931
 932         return 0;
 933
 934  fail_pm_qos:
 935         ieee80211_led_exit(local);
 936         ieee80211_remove_interfaces(local);
 937  fail_rate:
 938         rtnl_unlock();
 939         ieee80211_wep_free(local);
 940  fail_wep:
 941         sta_info_stop(local);
 942  fail_sta_info:
 943         debugfs_hw_del(local);
 944         destroy_workqueue(local->workqueue);
 945  fail_workqueue:
 946         wiphy_unregister(local->hw.wiphy);
 947  fail_wiphy_register:
 948         kfree(local->int_scan_req);
 949         return result;
 950 }
 951 EXPORT_SYMBOL(ieee80211_register_hw);
 952
 953 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 954 {
 955         struct ieee80211_local *local = hw_to_local(hw);
 956
 957         tasklet_kill(&local->tx_pending_tasklet);
 958         tasklet_kill(&local->tasklet);
 959
 960         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 961                                &local->network_latency_notifier);
 962
 963         rtnl_lock();
 964
 965         /*
 966          * At this point, interface list manipulations are fine
 967          * because the driver cannot be handing us frames any
 968          * more and the tasklet is killed.
 969          */
 970         ieee80211_remove_interfaces(local);
 971
 972         rtnl_unlock();
 973
 974         cancel_work_sync(&local->reconfig_filter);
 975
 976         ieee80211_clear_tx_pending(local);
 977         sta_info_stop(local);
 978         rate_control_deinitialize(local);
 979         debugfs_hw_del(local);
 980
 981         if (skb_queue_len(&local->skb_queue)
 982                         || skb_queue_len(&local->skb_queue_unreliable))
 983                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 984                        wiphy_name(local->hw.wiphy));
 985         skb_queue_purge(&local->skb_queue);
 986         skb_queue_purge(&local->skb_queue_unreliable);
 987
 988         destroy_workqueue(local->workqueue);
 989         wiphy_unregister(local->hw.wiphy);
 990         ieee80211_wep_free(local);
 991         ieee80211_led_exit(local);
 992         kfree(local->int_scan_req);
 993 }
 994 EXPORT_SYMBOL(ieee80211_unregister_hw);
 995
 996 void ieee80211_free_hw(struct ieee80211_hw *hw)
 997 {
 998         struct ieee80211_local *local = hw_to_local(hw);
 999
1000         mutex_destroy(&local->iflist_mtx);
1001         mutex_destroy(&local->scan_mtx);
1002
1003         wiphy_free(local->hw.wiphy);
1004 }
1005 EXPORT_SYMBOL(ieee80211_free_hw);
1006
1007 static int __init ieee80211_init(void)
1008 {
1009         struct sk_buff *skb;
1010         int ret;
1011
1012         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1013         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1014                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1015
1016         ret = rc80211_minstrel_init();
1017         if (ret)
1018                 return ret;
1019
1020         ret = rc80211_pid_init();
1021         if (ret)
1022                 return ret;
1023
1024         ieee80211_debugfs_netdev_init();
1025
1026         return 0;
1027 }
1028
1029 static void __exit ieee80211_exit(void)
1030 {
1031         rc80211_pid_exit();
1032         rc80211_minstrel_exit();
1033
1034         /*
1035          * For key todo, it'll be empty by now but the work
1036          * might still be scheduled.
1037          */
1038         flush_scheduled_work();
1039
1040         if (mesh_allocated)
1041                 ieee80211s_stop();
1042
1043         ieee80211_debugfs_netdev_exit();
1044 }
1045
1046
1047 subsys_initcall(ieee80211_init);
1048 module_exit(ieee80211_exit);
1049
1050 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1051 MODULE_LICENSE("GPL");