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