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         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 165                 return -EINVAL;
 166
 167         if (!local->ops->config_interface)
 168                 return 0;
 169
 170         memset(&conf, 0, sizeof(conf));
 171
 172         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 173                 conf.bssid = sdata->u.mgd.bssid;
 174         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 175                 conf.bssid = sdata->u.ibss.bssid;
 176         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 177                 conf.bssid = sdata->dev->dev_addr;
 178         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 179                 static const u8 zero[ETH_ALEN] = { 0 };
 180                 conf.bssid = zero;
 181         } else {
 182                 WARN_ON(1);
 183                 return -EINVAL;
 184         }
 185
 186         switch (sdata->vif.type) {
 187         case NL80211_IFTYPE_AP:
 188         case NL80211_IFTYPE_ADHOC:
 189         case NL80211_IFTYPE_MESH_POINT:
 190                 break;
 191         default:
 192                 /* do not warn to simplify caller in scan.c */
 193                 changed &= ~IEEE80211_IFCC_BEACON_ENABLED;
 194                 if (WARN_ON(changed & IEEE80211_IFCC_BEACON))
 195                         return -EINVAL;
 196                 changed &= ~IEEE80211_IFCC_BEACON;
 197                 break;
 198         }
 199
 200         if (changed & IEEE80211_IFCC_BEACON_ENABLED) {
 201                 if (local->sw_scanning) {
 202                         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                                 conf.enable_beacon =
 211                                         !!rcu_dereference(sdata->u.ap.beacon);
 212                                 break;
 213                         case NL80211_IFTYPE_ADHOC:
 214                                 conf.enable_beacon = !!sdata->u.ibss.probe_resp;
 215                                 break;
 216                         case NL80211_IFTYPE_MESH_POINT:
 217                                 conf.enable_beacon = true;
 218                                 break;
 219                         default:
 220                                 /* not reached */
 221                                 WARN_ON(1);
 222                                 break;
 223                         }
 224                 }
 225         }
 226
 227         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 228                 return -EINVAL;
 229
 230         conf.changed = changed;
 231
 232         return local->ops->config_interface(local_to_hw(local),
 233                                             &sdata->vif, &conf);
 234 }
 235
 236 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 237 {
 238         struct ieee80211_channel *chan;
 239         int ret = 0;
 240         int power;
 241         enum nl80211_channel_type channel_type;
 242
 243         might_sleep();
 244
 245         if (local->sw_scanning) {
 246                 chan = local->scan_channel;
 247                 channel_type = NL80211_CHAN_NO_HT;
 248         } else {
 249                 chan = local->oper_channel;
 250                 channel_type = local->oper_channel_type;
 251         }
 252
 253         if (chan != local->hw.conf.channel ||
 254             channel_type != local->hw.conf.channel_type) {
 255                 local->hw.conf.channel = chan;
 256                 local->hw.conf.channel_type = channel_type;
 257                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 258         }
 259
 260         if (local->sw_scanning)
 261                 power = chan->max_power;
 262         else
 263                 power = local->power_constr_level ?
 264                         (chan->max_power - local->power_constr_level) :
 265                         chan->max_power;
 266
 267         if (local->user_power_level)
 268                 power = min(power, local->user_power_level);
 269
 270         if (local->hw.conf.power_level != power) {
 271                 changed |= IEEE80211_CONF_CHANGE_POWER;
 272                 local->hw.conf.power_level = power;
 273         }
 274
 275         if (changed && local->open_count) {
 276                 ret = local->ops->config(local_to_hw(local), changed);
 277                 /*
 278                  * Goal:
 279                  * HW reconfiguration should never fail, the driver has told
 280                  * us what it can support so it should live up to that promise.
 281                  *
 282                  * Current status:
 283                  * rfkill is not integrated with mac80211 and a
 284                  * configuration command can thus fail if hardware rfkill
 285                  * is enabled
 286                  *
 287                  * FIXME: integrate rfkill with mac80211 and then add this
 288                  * WARN_ON() back
 289                  *
 290                  */
 291                 /* WARN_ON(ret); */
 292         }
 293
 294         return ret;
 295 }
 296
 297 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 298                                       u32 changed)
 299 {
 300         struct ieee80211_local *local = sdata->local;
 301
 302         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 303                 return;
 304
 305         if (!changed)
 306                 return;
 307
 308         if (local->ops->bss_info_changed)
 309                 local->ops->bss_info_changed(local_to_hw(local),
 310                                              &sdata->vif,
 311                                              &sdata->vif.bss_conf,
 312                                              changed);
 313 }
 314
 315 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 316 {
 317         sdata->vif.bss_conf.use_cts_prot = false;
 318         sdata->vif.bss_conf.use_short_preamble = false;
 319         sdata->vif.bss_conf.use_short_slot = false;
 320         return BSS_CHANGED_ERP_CTS_PROT |
 321                BSS_CHANGED_ERP_PREAMBLE |
 322                BSS_CHANGED_ERP_SLOT;
 323 }
 324
 325 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 326                                  struct sk_buff *skb)
 327 {
 328         struct ieee80211_local *local = hw_to_local(hw);
 329         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 330         int tmp;
 331
 332         skb->dev = local->mdev;
 333         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 334         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 335                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 336         tmp = skb_queue_len(&local->skb_queue) +
 337                 skb_queue_len(&local->skb_queue_unreliable);
 338         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 339                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 340                 dev_kfree_skb_irq(skb);
 341                 tmp--;
 342                 I802_DEBUG_INC(local->tx_status_drop);
 343         }
 344         tasklet_schedule(&local->tasklet);
 345 }
 346 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 347
 348 static void ieee80211_tasklet_handler(unsigned long data)
 349 {
 350         struct ieee80211_local *local = (struct ieee80211_local *) data;
 351         struct sk_buff *skb;
 352         struct ieee80211_rx_status rx_status;
 353         struct ieee80211_ra_tid *ra_tid;
 354
 355         while ((skb = skb_dequeue(&local->skb_queue)) ||
 356                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 357                 switch (skb->pkt_type) {
 358                 case IEEE80211_RX_MSG:
 359                         /* status is in skb->cb */
 360                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 361                         /* Clear skb->pkt_type in order to not confuse kernel
 362                          * netstack. */
 363                         skb->pkt_type = 0;
 364                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 365                         break;
 366                 case IEEE80211_TX_STATUS_MSG:
 367                         skb->pkt_type = 0;
 368                         ieee80211_tx_status(local_to_hw(local), skb);
 369                         break;
 370                 case IEEE80211_DELBA_MSG:
 371                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 372                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 373                                                 ra_tid->ra, ra_tid->tid);
 374                         dev_kfree_skb(skb);
 375                         break;
 376                 case IEEE80211_ADDBA_MSG:
 377                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 378                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 379                                                  ra_tid->ra, ra_tid->tid);
 380                         dev_kfree_skb(skb);
 381                         break ;
 382                 default:
 383                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 384                              skb->pkt_type);
 385                         dev_kfree_skb(skb);
 386                         break;
 387                 }
 388         }
 389 }
 390
 391 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 392  * make a prepared TX frame (one that has been given to hw) to look like brand
 393  * new IEEE 802.11 frame that is ready to go through TX processing again.
 394  */
 395 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 396                                       struct ieee80211_key *key,
 397                                       struct sk_buff *skb)
 398 {
 399         unsigned int hdrlen, iv_len, mic_len;
 400         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 401
 402         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 403
 404         if (!key)
 405                 goto no_key;
 406
 407         switch (key->conf.alg) {
 408         case ALG_WEP:
 409                 iv_len = WEP_IV_LEN;
 410                 mic_len = WEP_ICV_LEN;
 411                 break;
 412         case ALG_TKIP:
 413                 iv_len = TKIP_IV_LEN;
 414                 mic_len = TKIP_ICV_LEN;
 415                 break;
 416         case ALG_CCMP:
 417                 iv_len = CCMP_HDR_LEN;
 418                 mic_len = CCMP_MIC_LEN;
 419                 break;
 420         default:
 421                 goto no_key;
 422         }
 423
 424         if (skb->len >= hdrlen + mic_len &&
 425             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 426                 skb_trim(skb, skb->len - mic_len);
 427         if (skb->len >= hdrlen + iv_len) {
 428                 memmove(skb->data + iv_len, skb->data, hdrlen);
 429                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 430         }
 431
 432 no_key:
 433         if (ieee80211_is_data_qos(hdr->frame_control)) {
 434                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 435                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 436                         hdrlen - IEEE80211_QOS_CTL_LEN);
 437                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 438         }
 439 }
 440
 441 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 442                                             struct sta_info *sta,
 443                                             struct sk_buff *skb)
 444 {
 445         sta->tx_filtered_count++;
 446
 447         /*
 448          * Clear the TX filter mask for this STA when sending the next
 449          * packet. If the STA went to power save mode, this will happen
 450          * when it wakes up for the next time.
 451          */
 452         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 453
 454         /*
 455          * This code races in the following way:
 456          *
 457          *  (1) STA sends frame indicating it will go to sleep and does so
 458          *  (2) hardware/firmware adds STA to filter list, passes frame up
 459          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 460          *  (4) we get TX status before having processed the frame and
 461          *      knowing that the STA has gone to sleep.
 462          *
 463          * This is actually quite unlikely even when both those events are
 464          * processed from interrupts coming in quickly after one another or
 465          * even at the same time because we queue both TX status events and
 466          * RX frames to be processed by a tasklet and process them in the
 467          * same order that they were received or TX status last. Hence, there
 468          * is no race as long as the frame RX is processed before the next TX
 469          * status, which drivers can ensure, see below.
 470          *
 471          * Note that this can only happen if the hardware or firmware can
 472          * actually add STAs to the filter list, if this is done by the
 473          * driver in response to set_tim() (which will only reduce the race
 474          * this whole filtering tries to solve, not completely solve it)
 475          * this situation cannot happen.
 476          *
 477          * To completely solve this race drivers need to make sure that they
 478          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 479          *      functions and
 480          *  (b) always process RX events before TX status events if ordering
 481          *      can be unknown, for example with different interrupt status
 482          *      bits.
 483          */
 484         if (test_sta_flags(sta, WLAN_STA_PS) &&
 485             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 486                 ieee80211_remove_tx_extra(local, sta->key, skb);
 487                 skb_queue_tail(&sta->tx_filtered, skb);
 488                 return;
 489         }
 490
 491         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 492                 /* Software retry the packet once */
 493                 skb->requeue = 1;
 494                 ieee80211_remove_tx_extra(local, sta->key, skb);
 495                 dev_queue_xmit(skb);
 496                 return;
 497         }
 498
 499 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 500         if (net_ratelimit())
 501                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 502                        "queue_len=%d PS=%d @%lu\n",
 503                        wiphy_name(local->hw.wiphy),
 504                        skb_queue_len(&sta->tx_filtered),
 505                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 506 #endif
 507         dev_kfree_skb(skb);
 508 }
 509
 510 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 511 {
 512         struct sk_buff *skb2;
 513         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 514         struct ieee80211_local *local = hw_to_local(hw);
 515         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 516         u16 frag, type;
 517         __le16 fc;
 518         struct ieee80211_supported_band *sband;
 519         struct ieee80211_tx_status_rtap_hdr *rthdr;
 520         struct ieee80211_sub_if_data *sdata;
 521         struct net_device *prev_dev = NULL;
 522         struct sta_info *sta;
 523         int retry_count = -1, i;
 524
 525         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 526                 /* the HW cannot have attempted that rate */
 527                 if (i >= hw->max_rates) {
 528                         info->status.rates[i].idx = -1;
 529                         info->status.rates[i].count = 0;
 530                 }
 531
 532                 retry_count += info->status.rates[i].count;
 533         }
 534         if (retry_count < 0)
 535                 retry_count = 0;
 536
 537         rcu_read_lock();
 538
 539         sband = local->hw.wiphy->bands[info->band];
 540
 541         sta = sta_info_get(local, hdr->addr1);
 542
 543         if (sta) {
 544                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 545                     test_sta_flags(sta, WLAN_STA_PS)) {
 546                         /*
 547                          * The STA is in power save mode, so assume
 548                          * that this TX packet failed because of that.
 549                          */
 550                         ieee80211_handle_filtered_frame(local, sta, skb);
 551                         rcu_read_unlock();
 552                         return;
 553                 }
 554
 555                 fc = hdr->frame_control;
 556
 557                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 558                     (ieee80211_is_data_qos(fc))) {
 559                         u16 tid, ssn;
 560                         u8 *qc;
 561
 562                         qc = ieee80211_get_qos_ctl(hdr);
 563                         tid = qc[0] & 0xf;
 564                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 565                                                 & IEEE80211_SCTL_SEQ);
 566                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 567                                            tid, ssn);
 568                 }
 569
 570                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 571                         ieee80211_handle_filtered_frame(local, sta, skb);
 572                         rcu_read_unlock();
 573                         return;
 574                 } else {
 575                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 576                                 sta->tx_retry_failed++;
 577                         sta->tx_retry_count += retry_count;
 578                 }
 579
 580                 rate_control_tx_status(local, sband, sta, skb);
 581         }
 582
 583         rcu_read_unlock();
 584
 585         ieee80211_led_tx(local, 0);
 586
 587         /* SNMP counters
 588          * Fragments are passed to low-level drivers as separate skbs, so these
 589          * are actually fragments, not frames. Update frame counters only for
 590          * the first fragment of the frame. */
 591
 592         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 593         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 594
 595         if (info->flags & IEEE80211_TX_STAT_ACK) {
 596                 if (frag == 0) {
 597                         local->dot11TransmittedFrameCount++;
 598                         if (is_multicast_ether_addr(hdr->addr1))
 599                                 local->dot11MulticastTransmittedFrameCount++;
 600                         if (retry_count > 0)
 601                                 local->dot11RetryCount++;
 602                         if (retry_count > 1)
 603                                 local->dot11MultipleRetryCount++;
 604                 }
 605
 606                 /* This counter shall be incremented for an acknowledged MPDU
 607                  * with an individual address in the address 1 field or an MPDU
 608                  * with a multicast address in the address 1 field of type Data
 609                  * or Management. */
 610                 if (!is_multicast_ether_addr(hdr->addr1) ||
 611                     type == IEEE80211_FTYPE_DATA ||
 612                     type == IEEE80211_FTYPE_MGMT)
 613                         local->dot11TransmittedFragmentCount++;
 614         } else {
 615                 if (frag == 0)
 616                         local->dot11FailedCount++;
 617         }
 618
 619         /* this was a transmitted frame, but now we want to reuse it */
 620         skb_orphan(skb);
 621
 622         /*
 623          * This is a bit racy but we can avoid a lot of work
 624          * with this test...
 625          */
 626         if (!local->monitors && !local->cooked_mntrs) {
 627                 dev_kfree_skb(skb);
 628                 return;
 629         }
 630
 631         /* send frame to monitor interfaces now */
 632
 633         if (skb_headroom(skb) < sizeof(*rthdr)) {
 634                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 635                 dev_kfree_skb(skb);
 636                 return;
 637         }
 638
 639         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 640                                 skb_push(skb, sizeof(*rthdr));
 641
 642         memset(rthdr, 0, sizeof(*rthdr));
 643         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 644         rthdr->hdr.it_present =
 645                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 646                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 647                             (1 << IEEE80211_RADIOTAP_RATE));
 648
 649         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 650             !is_multicast_ether_addr(hdr->addr1))
 651                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 652
 653         /*
 654          * XXX: Once radiotap gets the bitmap reset thing the vendor
 655          *      extensions proposal contains, we can actually report
 656          *      the whole set of tries we did.
 657          */
 658         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 659             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 660                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 661         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 662                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 663         if (info->status.rates[0].idx >= 0 &&
 664             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 665                 rthdr->rate = sband->bitrates[
 666                                 info->status.rates[0].idx].bitrate / 5;
 667
 668         /* for now report the total retry_count */
 669         rthdr->data_retries = retry_count;
 670
 671         /* XXX: is this sufficient for BPF? */
 672         skb_set_mac_header(skb, 0);
 673         skb->ip_summed = CHECKSUM_UNNECESSARY;
 674         skb->pkt_type = PACKET_OTHERHOST;
 675         skb->protocol = htons(ETH_P_802_2);
 676         memset(skb->cb, 0, sizeof(skb->cb));
 677
 678         rcu_read_lock();
 679         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 680                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 681                         if (!netif_running(sdata->dev))
 682                                 continue;
 683
 684                         if (prev_dev) {
 685                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 686                                 if (skb2) {
 687                                         skb2->dev = prev_dev;
 688                                         netif_rx(skb2);
 689                                 }
 690                         }
 691
 692                         prev_dev = sdata->dev;
 693                 }
 694         }
 695         if (prev_dev) {
 696                 skb->dev = prev_dev;
 697                 netif_rx(skb);
 698                 skb = NULL;
 699         }
 700         rcu_read_unlock();
 701         dev_kfree_skb(skb);
 702 }
 703 EXPORT_SYMBOL(ieee80211_tx_status);
 704
 705 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 706                                         const struct ieee80211_ops *ops)
 707 {
 708         struct ieee80211_local *local;
 709         int priv_size, i;
 710         struct wiphy *wiphy;
 711
 712         /* Ensure 32-byte alignment of our private data and hw private data.
 713          * We use the wiphy priv data for both our ieee80211_local and for
 714          * the driver's private data
 715          *
 716          * In memory it'll be like this:
 717          *
 718          * +-------------------------+
 719          * | struct wiphy           |
 720          * +-------------------------+
 721          * | struct ieee80211_local  |
 722          * +-------------------------+
 723          * | driver's private data   |
 724          * +-------------------------+
 725          *
 726          */
 727         priv_size = ((sizeof(struct ieee80211_local) +
 728                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 729                     priv_data_len;
 730
 731         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 732
 733         if (!wiphy)
 734                 return NULL;
 735
 736         wiphy->privid = mac80211_wiphy_privid;
 737         wiphy->max_scan_ssids = 4;
 738         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 739         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 740                                sizeof(struct cfg80211_bss);
 741
 742         local = wiphy_priv(wiphy);
 743         local->hw.wiphy = wiphy;
 744
 745         local->hw.priv = (char *)local +
 746                          ((sizeof(struct ieee80211_local) +
 747                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 748
 749         BUG_ON(!ops->tx);
 750         BUG_ON(!ops->start);
 751         BUG_ON(!ops->stop);
 752         BUG_ON(!ops->config);
 753         BUG_ON(!ops->add_interface);
 754         BUG_ON(!ops->remove_interface);
 755         BUG_ON(!ops->configure_filter);
 756         local->ops = ops;
 757
 758         /* set up some defaults */
 759         local->hw.queues = 1;
 760         local->hw.max_rates = 1;
 761         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 762         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 763         local->hw.conf.long_frame_max_tx_count = 4;
 764         local->hw.conf.short_frame_max_tx_count = 7;
 765         local->hw.conf.radio_enabled = true;
 766
 767         INIT_LIST_HEAD(&local->interfaces);
 768         mutex_init(&local->iflist_mtx);
 769
 770         spin_lock_init(&local->key_lock);
 771
 772         spin_lock_init(&local->queue_stop_reason_lock);
 773
 774         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 775
 776         INIT_WORK(&local->dynamic_ps_enable_work,
 777                   ieee80211_dynamic_ps_enable_work);
 778         INIT_WORK(&local->dynamic_ps_disable_work,
 779                   ieee80211_dynamic_ps_disable_work);
 780         setup_timer(&local->dynamic_ps_timer,
 781                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 782
 783         for (i = 0; i < IEEE80211_MAX_AMPDU_QUEUES; i++)
 784                 local->ampdu_ac_queue[i] = -1;
 785         /* using an s8 won't work with more than that */
 786         BUILD_BUG_ON(IEEE80211_MAX_AMPDU_QUEUES > 127);
 787
 788         sta_info_init(local);
 789
 790         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 791                      (unsigned long)local);
 792         tasklet_disable(&local->tx_pending_tasklet);
 793
 794         tasklet_init(&local->tasklet,
 795                      ieee80211_tasklet_handler,
 796                      (unsigned long) local);
 797         tasklet_disable(&local->tasklet);
 798
 799         skb_queue_head_init(&local->skb_queue);
 800         skb_queue_head_init(&local->skb_queue_unreliable);
 801
 802         return local_to_hw(local);
 803 }
 804 EXPORT_SYMBOL(ieee80211_alloc_hw);
 805
 806 static const struct net_device_ops ieee80211_master_ops = {
 807         .ndo_start_xmit = ieee80211_master_start_xmit,
 808         .ndo_open = ieee80211_master_open,
 809         .ndo_stop = ieee80211_master_stop,
 810         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
 811         .ndo_select_queue = ieee80211_select_queue,
 812 };
 813
 814 static void ieee80211_master_setup(struct net_device *mdev)
 815 {
 816         mdev->type = ARPHRD_IEEE80211;
 817         mdev->netdev_ops = &ieee80211_master_ops;
 818         mdev->header_ops = &ieee80211_header_ops;
 819         mdev->tx_queue_len = 1000;
 820         mdev->addr_len = ETH_ALEN;
 821 }
 822
 823 int ieee80211_register_hw(struct ieee80211_hw *hw)
 824 {
 825         struct ieee80211_local *local = hw_to_local(hw);
 826         int result;
 827         enum ieee80211_band band;
 828         struct net_device *mdev;
 829         struct ieee80211_master_priv *mpriv;
 830         int channels, i, j;
 831
 832         /*
 833          * generic code guarantees at least one band,
 834          * set this very early because much code assumes
 835          * that hw.conf.channel is assigned
 836          */
 837         channels = 0;
 838         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 839                 struct ieee80211_supported_band *sband;
 840
 841                 sband = local->hw.wiphy->bands[band];
 842                 if (sband && !local->oper_channel) {
 843                         /* init channel we're on */
 844                         local->hw.conf.channel =
 845                         local->oper_channel =
 846                         local->scan_channel = &sband->channels[0];
 847                 }
 848                 if (sband)
 849                         channels += sband->n_channels;
 850         }
 851
 852         local->int_scan_req.n_channels = channels;
 853         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
 854         if (!local->int_scan_req.channels)
 855                 return -ENOMEM;
 856
 857         /* if low-level driver supports AP, we also support VLAN */
 858         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 859                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 860
 861         /* mac80211 always supports monitor */
 862         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 863
 864         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 865                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 866         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 867                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 868
 869         result = wiphy_register(local->hw.wiphy);
 870         if (result < 0)
 871                 goto fail_wiphy_register;
 872
 873         /*
 874          * We use the number of queues for feature tests (QoS, HT) internally
 875          * so restrict them appropriately.
 876          */
 877         if (hw->queues > IEEE80211_MAX_QUEUES)
 878                 hw->queues = IEEE80211_MAX_QUEUES;
 879         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 880                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 881         if (hw->queues < 4)
 882                 hw->ampdu_queues = 0;
 883
 884         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 885                                "wmaster%d", ieee80211_master_setup,
 886                                hw->queues);
 887         if (!mdev)
 888                 goto fail_mdev_alloc;
 889
 890         mpriv = netdev_priv(mdev);
 891         mpriv->local = local;
 892         local->mdev = mdev;
 893
 894         local->hw.workqueue =
 895                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 896         if (!local->hw.workqueue) {
 897                 result = -ENOMEM;
 898                 goto fail_workqueue;
 899         }
 900
 901         /*
 902          * The hardware needs headroom for sending the frame,
 903          * and we need some headroom for passing the frame to monitor
 904          * interfaces, but never both at the same time.
 905          */
 906         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 907                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 908
 909         debugfs_hw_add(local);
 910
 911         if (local->hw.conf.beacon_int < 10)
 912                 local->hw.conf.beacon_int = 100;
 913
 914         if (local->hw.max_listen_interval == 0)
 915                 local->hw.max_listen_interval = 1;
 916
 917         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 918
 919         result = sta_info_start(local);
 920         if (result < 0)
 921                 goto fail_sta_info;
 922
 923         rtnl_lock();
 924         result = dev_alloc_name(local->mdev, local->mdev->name);
 925         if (result < 0)
 926                 goto fail_dev;
 927
 928         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 929         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 930         local->mdev->features |= NETIF_F_NETNS_LOCAL;
 931
 932         result = register_netdevice(local->mdev);
 933         if (result < 0)
 934                 goto fail_dev;
 935
 936         result = ieee80211_init_rate_ctrl_alg(local,
 937                                               hw->rate_control_algorithm);
 938         if (result < 0) {
 939                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 940                        "algorithm\n", wiphy_name(local->hw.wiphy));
 941                 goto fail_rate;
 942         }
 943
 944         result = ieee80211_wep_init(local);
 945
 946         if (result < 0) {
 947                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 948                        wiphy_name(local->hw.wiphy), result);
 949                 goto fail_wep;
 950         }
 951
 952         /* add one default STA interface if supported */
 953         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 954                 result = ieee80211_if_add(local, "wlan%d", NULL,
 955                                           NL80211_IFTYPE_STATION, NULL);
 956                 if (result)
 957                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 958                                wiphy_name(local->hw.wiphy));
 959         }
 960
 961         rtnl_unlock();
 962
 963         ieee80211_led_init(local);
 964
 965         /* alloc internal scan request */
 966         i = 0;
 967         local->int_scan_req.ssids = &local->scan_ssid;
 968         local->int_scan_req.n_ssids = 1;
 969         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 970                 if (!hw->wiphy->bands[band])
 971                         continue;
 972                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 973                         local->int_scan_req.channels[i] =
 974                                 &hw->wiphy->bands[band]->channels[j];
 975                         i++;
 976                 }
 977         }
 978
 979         return 0;
 980
 981 fail_wep:
 982         rate_control_deinitialize(local);
 983 fail_rate:
 984         unregister_netdevice(local->mdev);
 985         local->mdev = NULL;
 986 fail_dev:
 987         rtnl_unlock();
 988         sta_info_stop(local);
 989 fail_sta_info:
 990         debugfs_hw_del(local);
 991         destroy_workqueue(local->hw.workqueue);
 992 fail_workqueue:
 993         if (local->mdev)
 994                 free_netdev(local->mdev);
 995 fail_mdev_alloc:
 996         wiphy_unregister(local->hw.wiphy);
 997 fail_wiphy_register:
 998         kfree(local->int_scan_req.channels);
 999         return result;
1000 }
1001 EXPORT_SYMBOL(ieee80211_register_hw);
1002
1003 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1004 {
1005         struct ieee80211_local *local = hw_to_local(hw);
1006
1007         tasklet_kill(&local->tx_pending_tasklet);
1008         tasklet_kill(&local->tasklet);
1009
1010         rtnl_lock();
1011
1012         /*
1013          * At this point, interface list manipulations are fine
1014          * because the driver cannot be handing us frames any
1015          * more and the tasklet is killed.
1016          */
1017
1018         /* First, we remove all virtual interfaces. */
1019         ieee80211_remove_interfaces(local);
1020
1021         /* then, finally, remove the master interface */
1022         unregister_netdevice(local->mdev);
1023
1024         rtnl_unlock();
1025
1026         ieee80211_clear_tx_pending(local);
1027         sta_info_stop(local);
1028         rate_control_deinitialize(local);
1029         debugfs_hw_del(local);
1030
1031         if (skb_queue_len(&local->skb_queue)
1032                         || skb_queue_len(&local->skb_queue_unreliable))
1033                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1034                        wiphy_name(local->hw.wiphy));
1035         skb_queue_purge(&local->skb_queue);
1036         skb_queue_purge(&local->skb_queue_unreliable);
1037
1038         destroy_workqueue(local->hw.workqueue);
1039         wiphy_unregister(local->hw.wiphy);
1040         ieee80211_wep_free(local);
1041         ieee80211_led_exit(local);
1042         free_netdev(local->mdev);
1043         kfree(local->int_scan_req.channels);
1044 }
1045 EXPORT_SYMBOL(ieee80211_unregister_hw);
1046
1047 void ieee80211_free_hw(struct ieee80211_hw *hw)
1048 {
1049         struct ieee80211_local *local = hw_to_local(hw);
1050
1051         mutex_destroy(&local->iflist_mtx);
1052
1053         wiphy_free(local->hw.wiphy);
1054 }
1055 EXPORT_SYMBOL(ieee80211_free_hw);
1056
1057 static int __init ieee80211_init(void)
1058 {
1059         struct sk_buff *skb;
1060         int ret;
1061
1062         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1063         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1064                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1065
1066         ret = rc80211_minstrel_init();
1067         if (ret)
1068                 return ret;
1069
1070         ret = rc80211_pid_init();
1071         if (ret)
1072                 return ret;
1073
1074         ieee80211_debugfs_netdev_init();
1075
1076         return 0;
1077 }
1078
1079 static void __exit ieee80211_exit(void)
1080 {
1081         rc80211_pid_exit();
1082         rc80211_minstrel_exit();
1083
1084         /*
1085          * For key todo, it'll be empty by now but the work
1086          * might still be scheduled.
1087          */
1088         flush_scheduled_work();
1089
1090         if (mesh_allocated)
1091                 ieee80211s_stop();
1092
1093         ieee80211_debugfs_netdev_exit();
1094 }
1095
1096
1097 subsys_initcall(ieee80211_init);
1098 module_exit(ieee80211_exit);
1099
1100 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1101 MODULE_LICENSE("GPL");