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

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