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