git.oblomov.eu Git - 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 <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wme.h"
  32 #include "aes_ccm.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36 #include "debugfs_netdev.h"
  37
  38 /*
  39  * For seeing transmitted packets on monitor interfaces
  40  * we have a radiotap header too.
  41  */
  42 struct ieee80211_tx_status_rtap_hdr {
  43         struct ieee80211_radiotap_header hdr;
  44         u8 rate;
  45         u8 padding_for_rate;
  46         __le16 tx_flags;
  47         u8 data_retries;
  48 } __attribute__ ((packed));
  49
  50
  51 /* must be called under mdev tx lock */
  52 void ieee80211_configure_filter(struct ieee80211_local *local)
  53 {
  54         unsigned int changed_flags;
  55         unsigned int new_flags = 0;
  56
  57         if (atomic_read(&local->iff_promiscs))
  58                 new_flags |= FIF_PROMISC_IN_BSS;
  59
  60         if (atomic_read(&local->iff_allmultis))
  61                 new_flags |= FIF_ALLMULTI;
  62
  63         if (local->monitors)
  64                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  65
  66         if (local->fif_fcsfail)
  67                 new_flags |= FIF_FCSFAIL;
  68
  69         if (local->fif_plcpfail)
  70                 new_flags |= FIF_PLCPFAIL;
  71
  72         if (local->fif_control)
  73                 new_flags |= FIF_CONTROL;
  74
  75         if (local->fif_other_bss)
  76                 new_flags |= FIF_OTHER_BSS;
  77
  78         changed_flags = local->filter_flags ^ new_flags;
  79
  80         /* be a bit nasty */
  81         new_flags |= (1<<31);
  82
  83         local->ops->configure_filter(local_to_hw(local),
  84                                      changed_flags, &new_flags,
  85                                      local->mdev->mc_count,
  86                                      local->mdev->mc_list);
  87
  88         WARN_ON(new_flags & (1<<31));
  89
  90         local->filter_flags = new_flags & ~(1<<31);
  91 }
  92
  93 /* master interface */
  94
  95 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  96 {
  97         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  98         return ETH_ALEN;
  99 }
 100
 101 static const struct header_ops ieee80211_header_ops = {
 102         .create         = eth_header,
 103         .parse          = header_parse_80211,
 104         .rebuild        = eth_rebuild_header,
 105         .cache          = eth_header_cache,
 106         .cache_update   = eth_header_cache_update,
 107 };
 108
 109 static int ieee80211_master_open(struct net_device *dev)
 110 {
 111         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 112         struct ieee80211_local *local = mpriv->local;
 113         struct ieee80211_sub_if_data *sdata;
 114         int res = -EOPNOTSUPP;
 115
 116         /* we hold the RTNL here so can safely walk the list */
 117         list_for_each_entry(sdata, &local->interfaces, list) {
 118                 if (netif_running(sdata->dev)) {
 119                         res = 0;
 120                         break;
 121                 }
 122         }
 123
 124         if (res)
 125                 return res;
 126
 127         netif_tx_start_all_queues(local->mdev);
 128
 129         return 0;
 130 }
 131
 132 static int ieee80211_master_stop(struct net_device *dev)
 133 {
 134         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 135         struct ieee80211_local *local = mpriv->local;
 136         struct ieee80211_sub_if_data *sdata;
 137
 138         /* we hold the RTNL here so can safely walk the list */
 139         list_for_each_entry(sdata, &local->interfaces, list)
 140                 if (netif_running(sdata->dev))
 141                         dev_close(sdata->dev);
 142
 143         return 0;
 144 }
 145
 146 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 147 {
 148         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 149         struct ieee80211_local *local = mpriv->local;
 150
 151         ieee80211_configure_filter(local);
 152 }
 153
 154 /* everything else */
 155
 156 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 157 {
 158         struct ieee80211_local *local = sdata->local;
 159         struct ieee80211_if_conf conf;
 160
 161         if (WARN_ON(!netif_running(sdata->dev)))
 162                 return 0;
 163
 164         memset(&conf, 0, sizeof(conf));
 165
 166         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 167                 conf.bssid = sdata->u.mgd.bssid;
 168         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 169                 conf.bssid = sdata->u.ibss.bssid;
 170         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 171                 conf.bssid = sdata->dev->dev_addr;
 172         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 173                 static const u8 zero[ETH_ALEN] = { 0 };
 174                 conf.bssid = zero;
 175         } else {
 176                 WARN_ON(1);
 177                 return -EINVAL;
 178         }
 179
 180         if (!local->ops->config_interface)
 181                 return 0;
 182
 183         switch (sdata->vif.type) {
 184         case NL80211_IFTYPE_AP:
 185         case NL80211_IFTYPE_ADHOC:
 186         case NL80211_IFTYPE_MESH_POINT:
 187                 break;
 188         default:
 189                 /* do not warn to simplify caller in scan.c */
 190                 changed &= ~IEEE80211_IFCC_BEACON_ENABLED;
 191                 if (WARN_ON(changed & IEEE80211_IFCC_BEACON))
 192                         return -EINVAL;
 193                 changed &= ~IEEE80211_IFCC_BEACON;
 194                 break;
 195         }
 196
 197         if (changed & IEEE80211_IFCC_BEACON_ENABLED) {
 198                 if (local->sw_scanning) {
 199                         conf.enable_beacon = false;
 200                 } else {
 201                         /*
 202                          * Beacon should be enabled, but AP mode must
 203                          * check whether there is a beacon configured.
 204                          */
 205                         switch (sdata->vif.type) {
 206                         case NL80211_IFTYPE_AP:
 207                                 conf.enable_beacon =
 208                                         !!rcu_dereference(sdata->u.ap.beacon);
 209                                 break;
 210                         case NL80211_IFTYPE_ADHOC:
 211                                 conf.enable_beacon = !!sdata->u.ibss.probe_resp;
 212                                 break;
 213                         case NL80211_IFTYPE_MESH_POINT:
 214                                 conf.enable_beacon = true;
 215                                 break;
 216                         default:
 217                                 /* not reached */
 218                                 WARN_ON(1);
 219                                 break;
 220                         }
 221                 }
 222         }
 223
 224         conf.changed = changed;
 225
 226         return local->ops->config_interface(local_to_hw(local),
 227                                             &sdata->vif, &conf);
 228 }
 229
 230 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 231 {
 232         struct ieee80211_channel *chan;
 233         int ret = 0;
 234         int power;
 235         enum nl80211_channel_type channel_type;
 236
 237         might_sleep();
 238
 239         if (local->sw_scanning) {
 240                 chan = local->scan_channel;
 241                 channel_type = NL80211_CHAN_NO_HT;
 242         } else {
 243                 chan = local->oper_channel;
 244                 channel_type = local->oper_channel_type;
 245         }
 246
 247         if (chan != local->hw.conf.channel ||
 248             channel_type != local->hw.conf.channel_type) {
 249                 local->hw.conf.channel = chan;
 250                 local->hw.conf.channel_type = channel_type;
 251                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 252         }
 253
 254         if (local->sw_scanning)
 255                 power = chan->max_power;
 256         else
 257                 power = local->power_constr_level ?
 258                         (chan->max_power - local->power_constr_level) :
 259                         chan->max_power;
 260
 261         if (local->user_power_level >= 0)
 262                 power = min(power, local->user_power_level);
 263
 264         if (local->hw.conf.power_level != power) {
 265                 changed |= IEEE80211_CONF_CHANGE_POWER;
 266                 local->hw.conf.power_level = power;
 267         }
 268
 269         if (changed && local->open_count) {
 270                 ret = local->ops->config(local_to_hw(local), changed);
 271                 /*
 272                  * Goal:
 273                  * HW reconfiguration should never fail, the driver has told
 274                  * us what it can support so it should live up to that promise.
 275                  *
 276                  * Current status:
 277                  * rfkill is not integrated with mac80211 and a
 278                  * configuration command can thus fail if hardware rfkill
 279                  * is enabled
 280                  *
 281                  * FIXME: integrate rfkill with mac80211 and then add this
 282                  * WARN_ON() back
 283                  *
 284                  */
 285                 /* WARN_ON(ret); */
 286         }
 287
 288         return ret;
 289 }
 290
 291 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 292                                       u32 changed)
 293 {
 294         struct ieee80211_local *local = sdata->local;
 295
 296         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 297                 return;
 298
 299         if (!changed)
 300                 return;
 301
 302         if (local->ops->bss_info_changed)
 303                 local->ops->bss_info_changed(local_to_hw(local),
 304                                              &sdata->vif,
 305                                              &sdata->vif.bss_conf,
 306                                              changed);
 307 }
 308
 309 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 310 {
 311         sdata->vif.bss_conf.use_cts_prot = false;
 312         sdata->vif.bss_conf.use_short_preamble = false;
 313         sdata->vif.bss_conf.use_short_slot = false;
 314         return BSS_CHANGED_ERP_CTS_PROT |
 315                BSS_CHANGED_ERP_PREAMBLE |
 316                BSS_CHANGED_ERP_SLOT;
 317 }
 318
 319 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 320                                  struct sk_buff *skb)
 321 {
 322         struct ieee80211_local *local = hw_to_local(hw);
 323         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 324         int tmp;
 325
 326         skb->dev = local->mdev;
 327         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 328         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 329                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 330         tmp = skb_queue_len(&local->skb_queue) +
 331                 skb_queue_len(&local->skb_queue_unreliable);
 332         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 333                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 334                 dev_kfree_skb_irq(skb);
 335                 tmp--;
 336                 I802_DEBUG_INC(local->tx_status_drop);
 337         }
 338         tasklet_schedule(&local->tasklet);
 339 }
 340 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 341
 342 static void ieee80211_tasklet_handler(unsigned long data)
 343 {
 344         struct ieee80211_local *local = (struct ieee80211_local *) data;
 345         struct sk_buff *skb;
 346         struct ieee80211_rx_status rx_status;
 347         struct ieee80211_ra_tid *ra_tid;
 348
 349         while ((skb = skb_dequeue(&local->skb_queue)) ||
 350                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 351                 switch (skb->pkt_type) {
 352                 case IEEE80211_RX_MSG:
 353                         /* status is in skb->cb */
 354                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 355                         /* Clear skb->pkt_type in order to not confuse kernel
 356                          * netstack. */
 357                         skb->pkt_type = 0;
 358                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 359                         break;
 360                 case IEEE80211_TX_STATUS_MSG:
 361                         skb->pkt_type = 0;
 362                         ieee80211_tx_status(local_to_hw(local), skb);
 363                         break;
 364                 case IEEE80211_DELBA_MSG:
 365                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 366                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 367                                                 ra_tid->ra, ra_tid->tid);
 368                         dev_kfree_skb(skb);
 369                         break;
 370                 case IEEE80211_ADDBA_MSG:
 371                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 372                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 373                                                  ra_tid->ra, ra_tid->tid);
 374                         dev_kfree_skb(skb);
 375                         break ;
 376                 default:
 377                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 378                              skb->pkt_type);
 379                         dev_kfree_skb(skb);
 380                         break;
 381                 }
 382         }
 383 }
 384
 385 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 386  * make a prepared TX frame (one that has been given to hw) to look like brand
 387  * new IEEE 802.11 frame that is ready to go through TX processing again.
 388  */
 389 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 390                                       struct ieee80211_key *key,
 391                                       struct sk_buff *skb)
 392 {
 393         unsigned int hdrlen, iv_len, mic_len;
 394         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 395
 396         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 397
 398         if (!key)
 399                 goto no_key;
 400
 401         switch (key->conf.alg) {
 402         case ALG_WEP:
 403                 iv_len = WEP_IV_LEN;
 404                 mic_len = WEP_ICV_LEN;
 405                 break;
 406         case ALG_TKIP:
 407                 iv_len = TKIP_IV_LEN;
 408                 mic_len = TKIP_ICV_LEN;
 409                 break;
 410         case ALG_CCMP:
 411                 iv_len = CCMP_HDR_LEN;
 412                 mic_len = CCMP_MIC_LEN;
 413                 break;
 414         default:
 415                 goto no_key;
 416         }
 417
 418         if (skb->len >= hdrlen + mic_len &&
 419             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 420                 skb_trim(skb, skb->len - mic_len);
 421         if (skb->len >= hdrlen + iv_len) {
 422                 memmove(skb->data + iv_len, skb->data, hdrlen);
 423                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 424         }
 425
 426 no_key:
 427         if (ieee80211_is_data_qos(hdr->frame_control)) {
 428                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 429                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 430                         hdrlen - IEEE80211_QOS_CTL_LEN);
 431                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 432         }
 433 }
 434
 435 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 436                                             struct sta_info *sta,
 437                                             struct sk_buff *skb)
 438 {
 439         sta->tx_filtered_count++;
 440
 441         /*
 442          * Clear the TX filter mask for this STA when sending the next
 443          * packet. If the STA went to power save mode, this will happen
 444          * when it wakes up for the next time.
 445          */
 446         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 447
 448         /*
 449          * This code races in the following way:
 450          *
 451          *  (1) STA sends frame indicating it will go to sleep and does so
 452          *  (2) hardware/firmware adds STA to filter list, passes frame up
 453          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 454          *  (4) we get TX status before having processed the frame and
 455          *      knowing that the STA has gone to sleep.
 456          *
 457          * This is actually quite unlikely even when both those events are
 458          * processed from interrupts coming in quickly after one another or
 459          * even at the same time because we queue both TX status events and
 460          * RX frames to be processed by a tasklet and process them in the
 461          * same order that they were received or TX status last. Hence, there
 462          * is no race as long as the frame RX is processed before the next TX
 463          * status, which drivers can ensure, see below.
 464          *
 465          * Note that this can only happen if the hardware or firmware can
 466          * actually add STAs to the filter list, if this is done by the
 467          * driver in response to set_tim() (which will only reduce the race
 468          * this whole filtering tries to solve, not completely solve it)
 469          * this situation cannot happen.
 470          *
 471          * To completely solve this race drivers need to make sure that they
 472          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 473          *      functions and
 474          *  (b) always process RX events before TX status events if ordering
 475          *      can be unknown, for example with different interrupt status
 476          *      bits.
 477          */
 478         if (test_sta_flags(sta, WLAN_STA_PS) &&
 479             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 480                 ieee80211_remove_tx_extra(local, sta->key, skb);
 481                 skb_queue_tail(&sta->tx_filtered, skb);
 482                 return;
 483         }
 484
 485         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 486                 /* Software retry the packet once */
 487                 skb->requeue = 1;
 488                 ieee80211_remove_tx_extra(local, sta->key, skb);
 489                 dev_queue_xmit(skb);
 490                 return;
 491         }
 492
 493 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 494         if (net_ratelimit())
 495                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 496                        "queue_len=%d PS=%d @%lu\n",
 497                        wiphy_name(local->hw.wiphy),
 498                        skb_queue_len(&sta->tx_filtered),
 499                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 500 #endif
 501         dev_kfree_skb(skb);
 502 }
 503
 504 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 505 {
 506         struct sk_buff *skb2;
 507         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 508         struct ieee80211_local *local = hw_to_local(hw);
 509         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 510         u16 frag, type;
 511         __le16 fc;
 512         struct ieee80211_supported_band *sband;
 513         struct ieee80211_tx_status_rtap_hdr *rthdr;
 514         struct ieee80211_sub_if_data *sdata;
 515         struct net_device *prev_dev = NULL;
 516         struct sta_info *sta;
 517         int retry_count = -1, i;
 518
 519         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 520                 /* the HW cannot have attempted that rate */
 521                 if (i >= hw->max_rates) {
 522                         info->status.rates[i].idx = -1;
 523                         info->status.rates[i].count = 0;
 524                 }
 525
 526                 retry_count += info->status.rates[i].count;
 527         }
 528         if (retry_count < 0)
 529                 retry_count = 0;
 530
 531         rcu_read_lock();
 532
 533         sband = local->hw.wiphy->bands[info->band];
 534
 535         sta = sta_info_get(local, hdr->addr1);
 536
 537         if (sta) {
 538                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 539                     test_sta_flags(sta, WLAN_STA_PS)) {
 540                         /*
 541                          * The STA is in power save mode, so assume
 542                          * that this TX packet failed because of that.
 543                          */
 544                         ieee80211_handle_filtered_frame(local, sta, skb);
 545                         rcu_read_unlock();
 546                         return;
 547                 }
 548
 549                 fc = hdr->frame_control;
 550
 551                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 552                     (ieee80211_is_data_qos(fc))) {
 553                         u16 tid, ssn;
 554                         u8 *qc;
 555
 556                         qc = ieee80211_get_qos_ctl(hdr);
 557                         tid = qc[0] & 0xf;
 558                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 559                                                 & IEEE80211_SCTL_SEQ);
 560                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 561                                            tid, ssn);
 562                 }
 563
 564                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 565                         ieee80211_handle_filtered_frame(local, sta, skb);
 566                         rcu_read_unlock();
 567                         return;
 568                 } else {
 569                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 570                                 sta->tx_retry_failed++;
 571                         sta->tx_retry_count += retry_count;
 572                 }
 573
 574                 rate_control_tx_status(local, sband, sta, skb);
 575         }
 576
 577         rcu_read_unlock();
 578
 579         ieee80211_led_tx(local, 0);
 580
 581         /* SNMP counters
 582          * Fragments are passed to low-level drivers as separate skbs, so these
 583          * are actually fragments, not frames. Update frame counters only for
 584          * the first fragment of the frame. */
 585
 586         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 587         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 588
 589         if (info->flags & IEEE80211_TX_STAT_ACK) {
 590                 if (frag == 0) {
 591                         local->dot11TransmittedFrameCount++;
 592                         if (is_multicast_ether_addr(hdr->addr1))
 593                                 local->dot11MulticastTransmittedFrameCount++;
 594                         if (retry_count > 0)
 595                                 local->dot11RetryCount++;
 596                         if (retry_count > 1)
 597                                 local->dot11MultipleRetryCount++;
 598                 }
 599
 600                 /* This counter shall be incremented for an acknowledged MPDU
 601                  * with an individual address in the address 1 field or an MPDU
 602                  * with a multicast address in the address 1 field of type Data
 603                  * or Management. */
 604                 if (!is_multicast_ether_addr(hdr->addr1) ||
 605                     type == IEEE80211_FTYPE_DATA ||
 606                     type == IEEE80211_FTYPE_MGMT)
 607                         local->dot11TransmittedFragmentCount++;
 608         } else {
 609                 if (frag == 0)
 610                         local->dot11FailedCount++;
 611         }
 612
 613         /* this was a transmitted frame, but now we want to reuse it */
 614         skb_orphan(skb);
 615
 616         /*
 617          * This is a bit racy but we can avoid a lot of work
 618          * with this test...
 619          */
 620         if (!local->monitors && !local->cooked_mntrs) {
 621                 dev_kfree_skb(skb);
 622                 return;
 623         }
 624
 625         /* send frame to monitor interfaces now */
 626
 627         if (skb_headroom(skb) < sizeof(*rthdr)) {
 628                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 629                 dev_kfree_skb(skb);
 630                 return;
 631         }
 632
 633         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 634                                 skb_push(skb, sizeof(*rthdr));
 635
 636         memset(rthdr, 0, sizeof(*rthdr));
 637         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 638         rthdr->hdr.it_present =
 639                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 640                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 641                             (1 << IEEE80211_RADIOTAP_RATE));
 642
 643         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 644             !is_multicast_ether_addr(hdr->addr1))
 645                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 646
 647         /*
 648          * XXX: Once radiotap gets the bitmap reset thing the vendor
 649          *      extensions proposal contains, we can actually report
 650          *      the whole set of tries we did.
 651          */
 652         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 653             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 654                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 655         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 656                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 657         if (info->status.rates[0].idx >= 0 &&
 658             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 659                 rthdr->rate = sband->bitrates[
 660                                 info->status.rates[0].idx].bitrate / 5;
 661
 662         /* for now report the total retry_count */
 663         rthdr->data_retries = retry_count;
 664
 665         /* XXX: is this sufficient for BPF? */
 666         skb_set_mac_header(skb, 0);
 667         skb->ip_summed = CHECKSUM_UNNECESSARY;
 668         skb->pkt_type = PACKET_OTHERHOST;
 669         skb->protocol = htons(ETH_P_802_2);
 670         memset(skb->cb, 0, sizeof(skb->cb));
 671
 672         rcu_read_lock();
 673         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 674                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 675                         if (!netif_running(sdata->dev))
 676                                 continue;
 677
 678                         if (prev_dev) {
 679                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 680                                 if (skb2) {
 681                                         skb2->dev = prev_dev;
 682                                         netif_rx(skb2);
 683                                 }
 684                         }
 685
 686                         prev_dev = sdata->dev;
 687                 }
 688         }
 689         if (prev_dev) {
 690                 skb->dev = prev_dev;
 691                 netif_rx(skb);
 692                 skb = NULL;
 693         }
 694         rcu_read_unlock();
 695         dev_kfree_skb(skb);
 696 }
 697 EXPORT_SYMBOL(ieee80211_tx_status);
 698
 699 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 700                                         const struct ieee80211_ops *ops)
 701 {
 702         struct ieee80211_local *local;
 703         int priv_size, i;
 704         struct wiphy *wiphy;
 705
 706         /* Ensure 32-byte alignment of our private data and hw private data.
 707          * We use the wiphy priv data for both our ieee80211_local and for
 708          * the driver's private data
 709          *
 710          * In memory it'll be like this:
 711          *
 712          * +-------------------------+
 713          * | struct wiphy           |
 714          * +-------------------------+
 715          * | struct ieee80211_local  |
 716          * +-------------------------+
 717          * | driver's private data   |
 718          * +-------------------------+
 719          *
 720          */
 721         priv_size = ((sizeof(struct ieee80211_local) +
 722                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 723                     priv_data_len;
 724
 725         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 726
 727         if (!wiphy)
 728                 return NULL;
 729
 730         wiphy->privid = mac80211_wiphy_privid;
 731         wiphy->max_scan_ssids = 4;
 732         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 733         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 734                                sizeof(struct cfg80211_bss);
 735
 736         local = wiphy_priv(wiphy);
 737         local->hw.wiphy = wiphy;
 738
 739         local->hw.priv = (char *)local +
 740                          ((sizeof(struct ieee80211_local) +
 741                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 742
 743         BUG_ON(!ops->tx);
 744         BUG_ON(!ops->start);
 745         BUG_ON(!ops->stop);
 746         BUG_ON(!ops->config);
 747         BUG_ON(!ops->add_interface);
 748         BUG_ON(!ops->remove_interface);
 749         BUG_ON(!ops->configure_filter);
 750         local->ops = ops;
 751
 752         /* set up some defaults */
 753         local->hw.queues = 1;
 754         local->hw.max_rates = 1;
 755         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 756         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 757         local->hw.conf.long_frame_max_tx_count = 4;
 758         local->hw.conf.short_frame_max_tx_count = 7;
 759         local->hw.conf.radio_enabled = true;
 760         local->user_power_level = -1;
 761
 762         INIT_LIST_HEAD(&local->interfaces);
 763         mutex_init(&local->iflist_mtx);
 764
 765         spin_lock_init(&local->key_lock);
 766
 767         spin_lock_init(&local->queue_stop_reason_lock);
 768
 769         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 770
 771         INIT_WORK(&local->dynamic_ps_enable_work,
 772                   ieee80211_dynamic_ps_enable_work);
 773         INIT_WORK(&local->dynamic_ps_disable_work,
 774                   ieee80211_dynamic_ps_disable_work);
 775         setup_timer(&local->dynamic_ps_timer,
 776                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 777
 778         sta_info_init(local);
 779
 780         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 781                 skb_queue_head_init(&local->pending[i]);
 782         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 783                      (unsigned long)local);
 784         tasklet_disable(&local->tx_pending_tasklet);
 785
 786         tasklet_init(&local->tasklet,
 787                      ieee80211_tasklet_handler,
 788                      (unsigned long) local);
 789         tasklet_disable(&local->tasklet);
 790
 791         skb_queue_head_init(&local->skb_queue);
 792         skb_queue_head_init(&local->skb_queue_unreliable);
 793
 794         spin_lock_init(&local->ampdu_lock);
 795
 796         return local_to_hw(local);
 797 }
 798 EXPORT_SYMBOL(ieee80211_alloc_hw);
 799
 800 static const struct net_device_ops ieee80211_master_ops = {
 801         .ndo_start_xmit = ieee80211_master_start_xmit,
 802         .ndo_open = ieee80211_master_open,
 803         .ndo_stop = ieee80211_master_stop,
 804         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
 805         .ndo_select_queue = ieee80211_select_queue,
 806 };
 807
 808 static void ieee80211_master_setup(struct net_device *mdev)
 809 {
 810         mdev->type = ARPHRD_IEEE80211;
 811         mdev->netdev_ops = &ieee80211_master_ops;
 812         mdev->header_ops = &ieee80211_header_ops;
 813         mdev->tx_queue_len = 1000;
 814         mdev->addr_len = ETH_ALEN;
 815 }
 816
 817 int ieee80211_register_hw(struct ieee80211_hw *hw)
 818 {
 819         struct ieee80211_local *local = hw_to_local(hw);
 820         int result;
 821         enum ieee80211_band band;
 822         struct net_device *mdev;
 823         struct ieee80211_master_priv *mpriv;
 824         int channels, i, j;
 825
 826         /*
 827          * generic code guarantees at least one band,
 828          * set this very early because much code assumes
 829          * that hw.conf.channel is assigned
 830          */
 831         channels = 0;
 832         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 833                 struct ieee80211_supported_band *sband;
 834
 835                 sband = local->hw.wiphy->bands[band];
 836                 if (sband && !local->oper_channel) {
 837                         /* init channel we're on */
 838                         local->hw.conf.channel =
 839                         local->oper_channel =
 840                         local->scan_channel = &sband->channels[0];
 841                 }
 842                 if (sband)
 843                         channels += sband->n_channels;
 844         }
 845
 846         local->int_scan_req.n_channels = channels;
 847         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
 848         if (!local->int_scan_req.channels)
 849                 return -ENOMEM;
 850
 851         /* if low-level driver supports AP, we also support VLAN */
 852         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 853                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 854
 855         /* mac80211 always supports monitor */
 856         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 857
 858         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 859                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 860         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 861                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 862
 863         result = wiphy_register(local->hw.wiphy);
 864         if (result < 0)
 865                 goto fail_wiphy_register;
 866
 867         /*
 868          * We use the number of queues for feature tests (QoS, HT) internally
 869          * so restrict them appropriately.
 870          */
 871         if (hw->queues > IEEE80211_MAX_QUEUES)
 872                 hw->queues = IEEE80211_MAX_QUEUES;
 873
 874         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 875                                "wmaster%d", ieee80211_master_setup,
 876                                hw->queues);
 877         if (!mdev)
 878                 goto fail_mdev_alloc;
 879
 880         mpriv = netdev_priv(mdev);
 881         mpriv->local = local;
 882         local->mdev = mdev;
 883
 884         local->hw.workqueue =
 885                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 886         if (!local->hw.workqueue) {
 887                 result = -ENOMEM;
 888                 goto fail_workqueue;
 889         }
 890
 891         /*
 892          * The hardware needs headroom for sending the frame,
 893          * and we need some headroom for passing the frame to monitor
 894          * interfaces, but never both at the same time.
 895          */
 896         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 897                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 898
 899         debugfs_hw_add(local);
 900
 901         if (local->hw.conf.beacon_int < 10)
 902                 local->hw.conf.beacon_int = 100;
 903
 904         if (local->hw.max_listen_interval == 0)
 905                 local->hw.max_listen_interval = 1;
 906
 907         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 908
 909         result = sta_info_start(local);
 910         if (result < 0)
 911                 goto fail_sta_info;
 912
 913         result = ieee80211_wep_init(local);
 914         if (result < 0) {
 915                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 916                        wiphy_name(local->hw.wiphy), result);
 917                 goto fail_wep;
 918         }
 919
 920         rtnl_lock();
 921         result = dev_alloc_name(local->mdev, local->mdev->name);
 922         if (result < 0)
 923                 goto fail_dev;
 924
 925         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 926         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 927         local->mdev->features |= NETIF_F_NETNS_LOCAL;
 928
 929         result = register_netdevice(local->mdev);
 930         if (result < 0)
 931                 goto fail_dev;
 932
 933         result = ieee80211_init_rate_ctrl_alg(local,
 934                                               hw->rate_control_algorithm);
 935         if (result < 0) {
 936                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 937                        "algorithm\n", wiphy_name(local->hw.wiphy));
 938                 goto fail_rate;
 939         }
 940
 941         /* add one default STA interface if supported */
 942         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 943                 result = ieee80211_if_add(local, "wlan%d", NULL,
 944                                           NL80211_IFTYPE_STATION, NULL);
 945                 if (result)
 946                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 947                                wiphy_name(local->hw.wiphy));
 948         }
 949
 950         rtnl_unlock();
 951
 952         ieee80211_led_init(local);
 953
 954         /* alloc internal scan request */
 955         i = 0;
 956         local->int_scan_req.ssids = &local->scan_ssid;
 957         local->int_scan_req.n_ssids = 1;
 958         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 959                 if (!hw->wiphy->bands[band])
 960                         continue;
 961                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 962                         local->int_scan_req.channels[i] =
 963                                 &hw->wiphy->bands[band]->channels[j];
 964                         i++;
 965                 }
 966         }
 967
 968         return 0;
 969
 970 fail_rate:
 971         unregister_netdevice(local->mdev);
 972         local->mdev = NULL;
 973 fail_dev:
 974         rtnl_unlock();
 975         ieee80211_wep_free(local);
 976 fail_wep:
 977         sta_info_stop(local);
 978 fail_sta_info:
 979         debugfs_hw_del(local);
 980         destroy_workqueue(local->hw.workqueue);
 981 fail_workqueue:
 982         if (local->mdev)
 983                 free_netdev(local->mdev);
 984 fail_mdev_alloc:
 985         wiphy_unregister(local->hw.wiphy);
 986 fail_wiphy_register:
 987         kfree(local->int_scan_req.channels);
 988         return result;
 989 }
 990 EXPORT_SYMBOL(ieee80211_register_hw);
 991
 992 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 993 {
 994         struct ieee80211_local *local = hw_to_local(hw);
 995
 996         tasklet_kill(&local->tx_pending_tasklet);
 997         tasklet_kill(&local->tasklet);
 998
 999         rtnl_lock();
1000
1001         /*
1002          * At this point, interface list manipulations are fine
1003          * because the driver cannot be handing us frames any
1004          * more and the tasklet is killed.
1005          */
1006
1007         /* First, we remove all virtual interfaces. */
1008         ieee80211_remove_interfaces(local);
1009
1010         /* then, finally, remove the master interface */
1011         unregister_netdevice(local->mdev);
1012
1013         rtnl_unlock();
1014
1015         ieee80211_clear_tx_pending(local);
1016         sta_info_stop(local);
1017         rate_control_deinitialize(local);
1018         debugfs_hw_del(local);
1019
1020         if (skb_queue_len(&local->skb_queue)
1021                         || skb_queue_len(&local->skb_queue_unreliable))
1022                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1023                        wiphy_name(local->hw.wiphy));
1024         skb_queue_purge(&local->skb_queue);
1025         skb_queue_purge(&local->skb_queue_unreliable);
1026
1027         destroy_workqueue(local->hw.workqueue);
1028         wiphy_unregister(local->hw.wiphy);
1029         ieee80211_wep_free(local);
1030         ieee80211_led_exit(local);
1031         free_netdev(local->mdev);
1032         kfree(local->int_scan_req.channels);
1033 }
1034 EXPORT_SYMBOL(ieee80211_unregister_hw);
1035
1036 void ieee80211_free_hw(struct ieee80211_hw *hw)
1037 {
1038         struct ieee80211_local *local = hw_to_local(hw);
1039
1040         mutex_destroy(&local->iflist_mtx);
1041
1042         wiphy_free(local->hw.wiphy);
1043 }
1044 EXPORT_SYMBOL(ieee80211_free_hw);
1045
1046 static int __init ieee80211_init(void)
1047 {
1048         struct sk_buff *skb;
1049         int ret;
1050
1051         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1052         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1053                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1054
1055         ret = rc80211_minstrel_init();
1056         if (ret)
1057                 return ret;
1058
1059         ret = rc80211_pid_init();
1060         if (ret)
1061                 return ret;
1062
1063         ieee80211_debugfs_netdev_init();
1064
1065         return 0;
1066 }
1067
1068 static void __exit ieee80211_exit(void)
1069 {
1070         rc80211_pid_exit();
1071         rc80211_minstrel_exit();
1072
1073         /*
1074          * For key todo, it'll be empty by now but the work
1075          * might still be scheduled.
1076          */
1077         flush_scheduled_work();
1078
1079         if (mesh_allocated)
1080                 ieee80211s_stop();
1081
1082         ieee80211_debugfs_netdev_exit();
1083 }
1084
1085
1086 subsys_initcall(ieee80211_init);
1087 module_exit(ieee80211_exit);
1088
1089 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1090 MODULE_LICENSE("GPL");